CN113028585A - Control protection method and system for compressor - Google Patents
Control protection method and system for compressor Download PDFInfo
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- CN113028585A CN113028585A CN202110351544.2A CN202110351544A CN113028585A CN 113028585 A CN113028585 A CN 113028585A CN 202110351544 A CN202110351544 A CN 202110351544A CN 113028585 A CN113028585 A CN 113028585A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The invention provides a control protection method and a system for a compressor, wherein the method comprises the following steps: collecting the exhaust pressure of a compressor and the evaporation temperature of an evaporator; determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure; determining whether a low-pressure protection abnormality exists in the compressor based on the collected evaporation temperature; if the compressor has high-voltage protection abnormity or low-voltage protection abnormity, acquiring the winding temperature of a motor in the compressor in a first preset acquisition period; determining whether a high-voltage protection fault or a low-voltage protection fault exists in the compressor based on the collected winding temperature; if yes, controlling the running state of the compressor to be set to be a stop state; and if not, controlling the running state of the compressor to be set to be a normal state. The scheme of the invention can improve the accuracy of judging the high-voltage protection fault and the low-voltage protection fault.
Description
Technical Field
The invention relates to the technical field of compression refrigeration, in particular to a control protection method and a control protection system for a compressor.
Background
The compressor refrigeration system is generally composed of a compressor, a condenser, a throttling device, an evaporator, a temperature sensor, a high-pressure protection switch and a low-pressure protection switch. High-voltage protection switches and low-voltage protection switches are devices for system pressure protection. The high-low voltage protection is equipped to increase the reliability of the air conditioning system, and once the high-low voltage protection device has a problem, certain protection fault measures are given.
For example, patent application No. CN201811583848.6 discloses a control protection method for an air conditioner and an air conditioner, and specifically discloses a control protection method for an air conditioner and an air conditioner, where the control protection method includes: detecting an actual pressure value of the air conditioner, and checking whether the air conditioner operates abnormally or not when the actual pressure value changes to a preset check value; the preset check value is smaller than the preset high-voltage protection value and larger than the preset low-voltage protection value. The scheme can avoid frequent start and stop of the air conditioner, effectively protects the air conditioner and improves the working efficiency.
However, if the high-voltage protection switch and the low-voltage protection switch are judged by mistake, unnecessary troubles are caused. For example, if the evaporator or condenser is dirty plugged or the fan is damaged, a failure of the low or high pressure protection may also occur, but the failure is likely to be a false positive.
Therefore, a control protection method and system for a compressor are needed to solve the above technical problems.
Disclosure of Invention
The embodiment of the invention provides a control protection method and a control protection system for a compressor, which can improve the accuracy of judging a high-voltage protection fault and a low-voltage protection fault.
In a first aspect, an embodiment of the present invention provides a control protection method for a compressor, including:
collecting the exhaust pressure of a compressor and the evaporation temperature of an evaporator;
determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure;
determining whether a low-pressure protection abnormality exists in the compressor based on the collected evaporation temperature;
if the compressor has high-voltage protection abnormity or low-voltage protection abnormity, acquiring the winding temperature of a motor in the compressor in a first preset acquisition period;
determining whether a high-voltage protection fault or a low-voltage protection fault exists in the compressor based on the collected winding temperature;
if yes, controlling the running state of the compressor to be set to be a stop state;
and if not, controlling the running state of the compressor to be set to be a normal state.
In one possible design, the determining whether the compressor has high-pressure abnormal protection based on the collected exhaust pressure includes:
if the collected exhaust pressure is greater than the preset pressure, continuously collecting the exhaust pressure of the compressor in a second preset collection period, and if the difference between the exhaust pressure and a preset pressure constant is still greater than the preset pressure, determining that the compressor has high-pressure protection abnormity; if the difference between the exhaust pressure and a preset pressure constant is smaller than the preset pressure, determining that the compressor has no high-pressure protection abnormity; the exhaust pressure of the compressor acquired in a second preset acquisition period is the average value of a plurality of exhaust pressures of the compressor acquired in the second preset acquisition period;
and/or the presence of a gas in the gas,
the determining whether the compressor has a low-pressure protection abnormality based on the collected evaporation temperature includes:
if the collected evaporation temperature is less than a first preset temperature, continuing to collect the evaporation temperature of the evaporator in a third preset collection period, and if the sum of the evaporation temperature and a preset temperature constant is still less than the first preset temperature, determining that the compressor has low-pressure protection abnormity; if the sum of the evaporation temperature and a preset temperature constant is not less than the first preset temperature, determining that the compressor has no low-pressure protection abnormity; the evaporation temperature of the evaporator acquired in a third preset acquisition period is an average value of a plurality of evaporation temperatures of the compressor acquired in the third preset acquisition period.
In one possible design, the determining whether the compressor has a high-voltage protection fault or a low-voltage protection fault based on the collected winding temperature includes:
if the collected winding temperature is between a second preset temperature and a third preset temperature, determining that the compressor does not have a high-voltage protection fault or a low-voltage protection fault; wherein the second preset temperature is less than the third preset temperature;
and if the acquired winding temperature is lower than the second preset temperature or higher than the third preset temperature, determining that the compressor has a high-voltage protection fault or a low-voltage protection fault.
In one possible design, the collecting the winding temperature of the motor in the compressor in a first preset collecting period includes:
determining the running frequency of a motor in the compressor according to the current outdoor temperature, the current indoor temperature and the exhaust pressure or according to the current outdoor temperature, the current indoor temperature and the current evaporation temperature;
and under the operating frequency and the first preset acquisition period, taking the average value of the acquired temperatures of the plurality of windings of the motor in the compressor as the winding temperature of the motor in the first preset acquisition period.
In one possible design, when determining the operating frequency of the motor in the compressor based on the current outdoor temperature, indoor temperature and said discharge pressure:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, PgFor characterizing the exhaust pressure, SwtFor characterizing outdoor temperature; sntThe method comprises the following steps of characterizing indoor temperature, a characterizing a first frequency adjustment parameter, b characterizing a second frequency adjustment parameter and c characterizing a first error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and d is used for representing a first period adjustment parameter;
when determining the operating frequency of the motor in the compressor according to the current outdoor temperature, indoor temperature and the evaporation temperature:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, ZtThe device is used for representing the evaporation temperature, e is used for representing a third frequency adjustment parameter, f is used for representing a fourth frequency adjustment parameter, and g is used for representing a second error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and h is used for representing a second period adjustment parameter.
In a second aspect, an embodiment of the present invention provides a control protection system for a compressor, including: the method comprises the following steps: the system comprises an evaporator, a condenser, a high-voltage switch, a temperature sensor, a control module and a compressor;
the high-voltage switch is used for triggering when the exhaust pressure of the compressor reaches a preset value so as to send a high-voltage protection abnormal signal generated by triggering to the control module;
the temperature sensor is used for measuring the evaporation temperature of the evaporator;
the evaporator, the condenser and the control module are respectively connected with the compressor;
the control module is applied to the method.
In one possible design, the control module includes a safety protection module and a logic processing module;
the safety protection module comprises an exhaust pressure module, an evaporation temperature module and a motor winding temperature control module; the logic processing module comprises a timer module, an identification module, a confirmation module and an operation module;
the exhaust pressure module is used for detecting and judging exhaust pressure, and outputting a high-pressure protection abnormal signal when the exhaust pressure of the compressor reaches a preset value so as to prevent the compressor from being damaged due to no refrigerant running in the system;
the evaporation temperature module is used for detecting and judging evaporation temperature, and outputting a low-voltage protection abnormal signal when the detected evaporation temperature is lower than a certain temperature value;
the motor winding temperature control module is used for acquiring the winding temperature of the motor;
the logic processing module is used for controlling the running state of the compressor according to the detected exhaust pressure and winding temperature or according to the detected evaporation temperature and winding temperature.
In one possible design, the motor winding temperature control module is used for acquiring a winding temperature value ti of a motor in real time and comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than or equal to tmin, the refrigerating system operates according to a normal control logic; tmin < ti is less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, compressor frequency decrease;
high pressure pg (pg0, pg1, pg2) pg < pg0, compressor running normally; the rising of the frequency is limited when pg1 is greater than or equal to pg 0; pg2 is greater than pg which is more than or equal to pg 1; stopping the machine when pg is more than or equal to pg 2;
the evaporation temperature tz (tz0, tz1, tz2), tz < tz0, compressor operating normally; tz1 is more than or equal to tz0, so that the frequency rise is limited; tz2, wherein tz is more than or equal to tz1 frequency reduction; and (5) stopping the machine when tz is more than or equal to tz 2.
In a third aspect, an embodiment of the present invention provides a control protection device for a compressor, including:
the first acquisition module is used for acquiring the exhaust pressure of the compressor and the evaporation temperature of the evaporator;
the first determining module is used for determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure;
the second determination module is used for determining whether the compressor has low-pressure protection abnormity or not based on the collected evaporation temperature;
the second acquisition module is used for acquiring the winding temperature of a motor in the compressor in a first preset acquisition period if the compressor has high-voltage protection abnormity or low-voltage protection abnormity;
the third determining module is used for determining whether the compressor has a high-voltage protection fault or a low-voltage protection fault or not based on the collected winding temperature;
if yes, controlling the running state of the compressor to be set to be a stop state;
and if not, controlling the running state of the compressor to be set to be a normal state.
In a fourth aspect, an embodiment of the present invention provides a control protection device for a compressor, including: at least one memory and at least one processor;
the at least one memory to store a machine readable program;
the at least one processor is configured to invoke the machine-readable program to perform the method described above.
According to the scheme, the control protection method and the control protection system for the compressor provided by the invention determine whether the compressor has high-pressure protection abnormity or low-pressure protection abnormity by utilizing the collected exhaust pressure of the compressor and the evaporation temperature of the evaporator; and then determining whether the compressor has high-voltage protection fault or low-voltage protection fault according to the collected winding temperature of the motor after determining that the compressor has high-voltage protection abnormity or low-voltage protection abnormity. According to the technical scheme, the accuracy of judging the high-voltage protection fault and the low-voltage protection fault is improved, so that the high-voltage protection and the low-voltage protection are more timely, the low-voltage switch and related accessories thereof are saved, and the manufacturing cost of the compressor is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a control protection method of a compressor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control and protection system for a compressor according to one embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control protection device of a compressor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control and protection device for a compressor according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a refrigeration system of a compressor according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control module provided in one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
In a compressor refrigeration system, pipelines are generally connected and sealed through metal pipes, and the interior of the pipelines is filled with refrigerant, wherein the compressor is usually mainly totally enclosed, the process from air suction to air exhaust of the compressor is realized through the operation of a motor, and the flow and control of the refrigerant need to be accurate and reliable in measurement value of a temperature sensor. It is therefore considered to indirectly determine whether there is a high voltage protection failure of the compressor using the discharge temperature of the compressor, the condensing temperature of the condenser, and the winding temperature of the motor.
The foregoing is the concept provided by the present invention, and specific implementations of the concept provided by the present invention are described below.
Fig. 1 illustrates a flow chart of a control protection method of a compressor according to an embodiment. It is to be appreciated that the method can be performed by any apparatus, device, platform, cluster of devices having computing and processing capabilities. In the embodiment of the invention, the method is executed by the household appliance with the compressor, such as an air conditioner or a refrigerator with calculation and processing capabilities.
Referring to fig. 1, the method includes:
step 101: and collecting the exhaust pressure of the compressor and the evaporation temperature of the evaporator.
In this step, the discharge pressure may be set by setting a pressure sensor in the discharge pipe of the compressor, or by setting a high-voltage switch, but when the high-voltage switch is set, the preset value of the discharge pipe is collected by using the characteristic of the high-voltage switch, and when the pressure of the discharge pipe reaches the preset value, the high-voltage switch triggers to generate a high-voltage protection abnormal signal. And the evaporation temperature may be controlled by providing a temperature sensor at an appropriate position of the evaporator.
Step 102: and determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure.
In this step, when a high-pressure protection failure occurs in the compressor, the situation that the discharge pressure of the compressor is increased is generally caused, but there is a problem that erroneous judgment is made only by judging whether the discharge pressure is abnormal. Through the detection of the discharge pressure, for example, when the discharge pressure is higher than a certain preset value, such as higher than 4.5MPA, the high-pressure switch is actuated, and a high-pressure protection abnormal signal is output, so that the damage to the compressor caused by excessive refrigerant in the system and poor heat dissipation of a condenser is prevented.
In some embodiments, step 102 may specifically include the following steps:
if the collected exhaust pressure is greater than the preset pressure, continuously collecting the exhaust pressure of the compressor in a second preset collection period, and if the difference between the exhaust pressure and a preset pressure constant is still greater than the preset pressure, determining that the compressor has high-pressure protection abnormity; if the difference between the exhaust pressure and a preset pressure constant is smaller than a preset pressure, determining that the compressor has no high-pressure protection abnormity; the exhaust pressure of the compressor acquired in the second preset acquisition period is the average value of a plurality of exhaust pressures of the compressor acquired in the second preset acquisition period.
In this embodiment, for example, the pressure sensor is used to collect the pressure of the exhaust pipe, and since whether the compressor has the high-pressure protection abnormality cannot be accurately represented only by the exhaust pressure collected at one time, it can be determined whether the exhaust pressure is still in the abnormal range in each collection period (i.e., the second preset collection period) after the exhaust pressure is collected to be greater than the preset pressure, so that the accuracy of determining whether the compressor has the high-pressure protection abnormality can be improved. If not, the protection mechanism, i.e., the operation to determine whether a high pressure protection abnormality exists in the compressor, may be exited.
For example, when the exhaust pressure is not more than the preset pressure, the compressor can normally operate; however, when the discharge temperature is higher than the preset pressure, the compressor may have a state of limiting the frequency rise, down-conversion, shutdown, and the like.
Step 103: and determining whether the compressor has low-pressure protection abnormity or not based on the collected evaporation temperature.
In this step, when the low-pressure protection failure occurs in the compressor, the situation that the evaporation temperature of the evaporator is lower than a preset value is usually caused, but the problem of misjudgment exists only by judging whether the evaporation temperature is abnormal or not. By detecting the evaporation temperature, for example, when the evaporation temperature is lower than a certain preset value, a low-pressure protection abnormal signal is output to prevent the compressor from being damaged due to the fact that no refrigerant runs in the system.
In some embodiments, step 103 may specifically include the following steps:
if the collected evaporation temperature is less than the first preset temperature, continuing to collect the evaporation temperature of the evaporator in a third preset collection period, and if the sum of the evaporation temperature and a preset temperature constant is still less than the first preset temperature, determining that the compressor has low-pressure protection abnormity; if the sum of the evaporation temperature and a preset temperature constant is not less than a first preset temperature, determining that the compressor has no low-pressure protection abnormity; the evaporation temperature of the evaporator acquired in the third preset acquisition period is an average value of a plurality of evaporation temperatures of the compressor acquired in the third preset acquisition period.
In this embodiment, since whether the compressor has the low-pressure protection abnormality cannot be accurately represented only by the evaporation temperature acquired at one time, it is possible to determine whether the evaporation temperature is still within the abnormal range in one acquisition period (i.e., the third preset acquisition period) after each acquisition that the evaporation temperature is less than the first preset temperature, so that the accuracy of determining whether the compressor has the low-pressure protection abnormality can be improved. If not, the protection mechanism, i.e., the operation to determine whether there is a low pressure protection anomaly in the compressor, may be exited.
In some embodiments, the preset temperature constant may be 1 to 5, preferably 3.
For example, when the evaporation temperature is not less than the first preset temperature, the compressor can normally operate; however, when the evaporating temperature is lower than the first preset temperature, the compressor may have a state of limiting frequency rise, frequency reduction, shutdown, and the like.
Step 104: and if the compressor has high-voltage protection abnormity or low-voltage protection abnormity, acquiring the winding temperature of a motor in the compressor in a first preset acquisition period.
In this step, since the compressor completes the process from air suction to air discharge through the operation of the motor, and the winding temperature of the motor can more intuitively represent whether the compressor has a high-voltage protection fault or a low-voltage protection fault, it is necessary to collect the winding temperature of the motor in the compressor in a first preset collection period when it is determined that the compressor has a high-voltage protection abnormality or a low-voltage protection abnormality.
In some embodiments, step 104 may specifically include the following steps:
determining the running frequency of a motor in the compressor according to the current outdoor temperature, indoor temperature and exhaust pressure or the current outdoor temperature, indoor temperature and evaporation temperature;
and under the operation frequency and a first preset acquisition period, taking the average value of the acquired temperatures of a plurality of windings of the motor in the compressor as the winding temperature of the motor in the first preset acquisition period.
In this embodiment, when acquiring the winding temperature of the motor, the operating frequency of the motor needs to be considered, that is, the larger the operating frequency is, the higher the winding temperature is, and vice versa; the operating frequency of the motor needs to take into account the current outdoor temperature, indoor temperature, discharge pressure and evaporation temperature, such as the difference between indoor and outdoor temperatures. The collected winding temperature can show the real working condition of the compressor under the current condition by considering the running frequency of the motor, namely whether the compressor has a high-voltage protection fault or a low-voltage protection fault or not can be reflected more conveniently.
Further, when determining the operation frequency of the motor in the compressor according to the current outdoor temperature, indoor temperature and discharge pressure:
the operating frequency is determined by the following equation:
wherein F is used to characterize the operating frequency, PgFor characterizing the exhaust pressure, SwtFor characterizing outdoor temperature; sntThe method comprises the following steps of characterizing indoor temperature, a characterizing a first frequency adjustment parameter, b characterizing a second frequency adjustment parameter and c characterizing a first error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and d is used for representing a first period adjustment parameter;
when determining the operating frequency of the motor in the compressor according to the current outdoor temperature, indoor temperature and evaporating temperature:
the operating frequency is determined by the following equation:
wherein F is used to characterize the operating frequency, ZtThe device is used for representing the evaporation temperature, e is used for representing a third frequency adjustment parameter, f is used for representing a fourth frequency adjustment parameter, and g is used for representing a second error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and h is used for representing a second period adjustment parameter.
In this embodiment, generally speaking, when determining whether a high-temperature protection fault exists in the compressor, the important level of the exhaust pressure affecting the operation frequency of the motor is the highest, and then the indoor and outdoor temperature differences are set, so that the important levels of the exhaust pressure and the power of the indoor and outdoor temperature differences can be represented, and then the reasonable setting value of the operation frequency of the motor is optimized by setting the frequency adjustment parameter and the error adjustment parameter, thereby being beneficial to accurately determining the operation frequency when the winding temperature of the motor is acquired.
Similarly, when determining whether the compressor has low-temperature protection fault, the important level that the evaporating temperature affects the running frequency of the motor is the highest, and then the indoor and outdoor temperature difference is adopted, so that the important level of the evaporating temperature and the power of the indoor and outdoor temperature difference can be represented, and the reasonable setting value of the running frequency of the motor is optimized by setting the frequency adjustment parameter and the error adjustment parameter, thereby being beneficial to accurately determining the running frequency when the temperature of the motor winding is collected.
In addition, the collection period of the winding temperature is not set arbitrarily, and the first preset collection period may be determined according to the operating frequency in consideration of safety and accuracy of collected data.
Step 105: determining whether the compressor has a high-voltage protection fault or a low-voltage protection fault based on the collected winding temperature, and if so, controlling the running state of the compressor to be set to a shutdown state; and if not, controlling the running state of the compressor to be set to be a normal state.
In this step, if the winding temperature does not meet a certain condition, the compressor needs to be adjusted to a shutdown state in order to avoid burning out the motor or the compressor; otherwise, the normal operation of the compressor can be continuously maintained.
Further, in order to determine the operation state of the compressor in real time, the execution of step 101 may be continued after the execution of step 105 is completed.
In some embodiments, step 105 may specifically include the following steps:
if the collected winding temperature is between a second preset temperature and a third preset temperature, determining that the compressor does not have a high-voltage protection fault or a low-voltage protection fault; wherein the second preset temperature is less than the third preset temperature;
if the collected winding temperature is less than the second preset temperature or greater than the third preset temperature, determining that the compressor has a high-voltage protection fault or a low-voltage protection fault
In this embodiment, the control and protection method for the compressor provided by the invention determines whether the compressor has a high-pressure protection abnormality by using the collected exhaust temperature and the collected condensation temperature of the compressor; and after the compressor is determined to have high-voltage protection abnormity, determining whether the compressor has high-voltage protection fault according to the collected winding temperature of the motor. According to the technical scheme, the accuracy of judging the high-voltage protection fault is improved, so that the high-voltage protection is more timely, the high-voltage and low-voltage switches and related accessories are saved, and the manufacturing cost of the compressor is reduced.
For example, a low voltage switch, which is 14 yuan per unit price, can cost more than 18 yuan if the wiring and relay and compressor thermal protector and wiring are computationally connected. That is, the safety of the system is increased due to the saving of the low-voltage switch and the related accessories, such as the reduction of wires and welding points, the cost is low, and meanwhile, the system is safer and is more stable and timely to control.
Fig. 2 is a schematic diagram illustrating a control protection system for a compressor according to an embodiment of the present invention. Referring to fig. 2, the system includes:
an evaporator 201, a condenser 202, a high-pressure switch 203, a temperature sensor 204, a control module 205, and a compressor 206;
the high-voltage switch 203 is used for triggering when the exhaust pressure of the compressor reaches a preset value so as to send a high-voltage protection abnormal signal generated by triggering to the control module;
the temperature sensor 204 is used for measuring the evaporation temperature of the evaporator;
the evaporator 201, the condenser 202 and the control module 205 are respectively connected with the compressor 206;
the control module 205 applies the method described above.
In addition, the refrigeration system of the compressor can refer to the schematic diagram shown in fig. 5, and the details are not repeated herein.
It is to be understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the control and protection system of the compressor. In other embodiments of the invention, the control and protection system of the compressor may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The system has the same beneficial effects as the method, and the description is omitted.
Further, referring to fig. 6, the control module 205 includes a security protection module and a logic processing module;
the safety protection module comprises an exhaust pressure module, a condensation temperature module and a motor winding temperature control module; the logic processing module comprises a timer module, an identification module, a confirmation module and an operation module;
the discharge pressure module is used for detecting and judging discharge pressure, and outputting a high-pressure protection abnormal signal when the discharge pressure of the compressor reaches a preset value so as to prevent the compressor from being damaged due to no refrigerant running in the system;
the evaporation temperature module is used for detecting and judging evaporation temperature, and outputting a low-voltage protection abnormal signal when the detected evaporation temperature is lower than a certain temperature value;
the motor winding temperature control module is used for acquiring the winding temperature of the motor;
the logic processing module is used for controlling the running state of the compressor according to the detected exhaust temperature, the condensation temperature and the winding temperature.
As shown in fig. 3 and 4, an embodiment of the present invention provides a control protection device for a compressor and a control protection device for a compressor. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. From a hardware aspect, as shown in fig. 3, a hardware structure diagram of a control protection device for a compressor according to an embodiment of the present invention is provided, where in addition to the processor, the memory, the cable interface, and the nonvolatile memory shown in fig. 3, a device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing a message. Taking a software implementation as an example, as shown in fig. 4, as a logical apparatus, the apparatus is formed by reading a corresponding computer program instruction in a non-volatile memory into a memory by a CPU of a device in which the apparatus is located and running the computer program instruction.
As shown in fig. 4, the control protection device for a compressor according to the present embodiment includes:
the first acquisition module 401 is used for acquiring the exhaust pressure of the compressor and the evaporation temperature of the evaporator;
a first determining module 402, configured to determine whether a high-pressure abnormal protection exists in the compressor based on the collected exhaust pressure;
a second determining module 403, configured to determine whether a low-pressure protection abnormality exists in the compressor based on the collected evaporation temperature;
a second collecting module 404, configured to collect a winding temperature of a motor in the compressor within a first preset collecting period if the compressor has a high-voltage protection abnormality or a low-voltage protection abnormality;
a third determining module 405, configured to determine whether a high-voltage protection fault or a low-voltage protection fault exists in the compressor based on the collected winding temperature;
if yes, controlling the running state of the compressor to be set to be a stop state;
and if not, controlling the running state of the compressor to be set to be a normal state.
In an embodiment of the present invention, the first acquiring module 401 may be configured to perform step 101 in the above-described method embodiment, the first determining module 402 may be configured to perform step 102 in the above-described method embodiment, the second determining module 403 may be configured to perform step 103 in the above-described method embodiment, the second acquiring module 404 may be configured to perform step 104 in the above-described method embodiment, and the third determining module 405 may be configured to perform step 105 in the above-described method embodiment.
In an embodiment of the present invention, the first determining module 402 is configured to:
if the collected exhaust pressure is greater than the preset pressure, continuously collecting the exhaust pressure of the compressor in a second preset collection period, and if the difference between the exhaust pressure and a preset pressure constant is still greater than the preset pressure, determining that the compressor has high-pressure protection abnormity; if the difference between the exhaust pressure and a preset pressure constant is smaller than the preset pressure, determining that the compressor has no high-pressure protection abnormity; the exhaust pressure of the compressor acquired in a second preset acquisition period is the average value of a plurality of exhaust pressures of the compressor acquired in the second preset acquisition period;
and/or the presence of a gas in the gas,
a second determining module 403, configured to perform the following operations:
if the collected evaporation temperature is less than a first preset temperature, continuing to collect the evaporation temperature of the evaporator in a third preset collection period, and if the sum of the evaporation temperature and a preset temperature constant is still less than the first preset temperature, determining that the compressor has low-pressure protection abnormity; if the sum of the evaporation temperature and a preset temperature constant is not less than the first preset temperature, determining that the compressor has no low-pressure protection abnormity; the evaporation temperature of the evaporator acquired in a third preset acquisition period is an average value of a plurality of evaporation temperatures of the compressor acquired in the third preset acquisition period.
In an embodiment of the present invention, the third determining module 405 is configured to perform the following operations:
if the collected winding temperature is between a second preset temperature and a third preset temperature, determining that the compressor does not have a high-voltage protection fault or a low-voltage protection fault; wherein the second preset temperature is less than the third preset temperature;
and if the acquired winding temperature is lower than the second preset temperature or higher than the third preset temperature, determining that the compressor has a high-voltage protection fault or a low-voltage protection fault.
In an embodiment of the present invention, the second acquisition module 403 is configured to perform the following operations:
determining the running frequency of a motor in the compressor according to the current outdoor temperature, the current indoor temperature and the exhaust pressure or according to the current outdoor temperature, the current indoor temperature and the current evaporation temperature;
and under the operating frequency and the first preset acquisition period, taking the average value of the acquired temperatures of the plurality of windings of the motor in the compressor as the winding temperature of the motor in the first preset acquisition period.
In one embodiment of the present invention, when determining the operation frequency of the motor in the compressor based on the current outdoor temperature, indoor temperature and the discharge pressure:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, PgFor characterizing the exhaust pressure, SwtFor characterizing outdoor temperature; sntThe method comprises the following steps of characterizing indoor temperature, a characterizing a first frequency adjustment parameter, b characterizing a second frequency adjustment parameter and c characterizing a first error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and d is used for representing a first period adjustment parameter;
when determining the operating frequency of the motor in the compressor according to the current outdoor temperature, indoor temperature and the evaporation temperature:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, ZtThe device is used for representing the evaporation temperature, e is used for representing a third frequency adjustment parameter, f is used for representing a fourth frequency adjustment parameter, and g is used for representing a second error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and h is used for representing a second period adjustment parameter.
It is understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the control protection device of the compressor. In other embodiments of the invention, the control and protection device of the compressor may comprise more or fewer components than those shown, or some components may be combined, some components may be separated, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
Because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
The embodiment of the invention also provides a control protection device of a compressor, which comprises: at least one memory and at least one processor;
at least one memory for storing a machine readable program;
at least one processor for invoking a machine readable program to perform a control protection method of a compressor in any embodiment of the present invention.
Embodiments of the present invention also provide a computer-readable medium storing instructions for causing a computer to perform a control protection method of a compressor as described herein. Specifically, a method or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the method or the apparatus is caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer via a communications network.
Further, it should be clear that the functions of any one of the above-described embodiments can be implemented not only by executing the program code read out by the computer, but also by performing a part or all of the actual operations by an operation method or the like operating on the computer based on instructions of the program code.
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above embodiments are only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A control protection method for a compressor is characterized by comprising the following steps:
collecting the exhaust pressure of a compressor and the evaporation temperature of an evaporator;
determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure;
determining whether a low-pressure protection abnormality exists in the compressor based on the collected evaporation temperature;
if the compressor has high-voltage protection abnormity or low-voltage protection abnormity, acquiring the winding temperature of a motor in the compressor in a first preset acquisition period;
determining whether a high-voltage protection fault or a low-voltage protection fault exists in the compressor based on the collected winding temperature;
if yes, controlling the running state of the compressor to be set to be a stop state;
and if not, controlling the running state of the compressor to be set to be a normal state.
2. The method of claim 1, wherein said determining whether high pressure abnormal protection exists for the compressor based on the collected discharge pressure comprises:
if the collected exhaust pressure is greater than the preset pressure, continuously collecting the exhaust pressure of the compressor in a second preset collection period, and if the difference between the exhaust pressure and a preset pressure constant is still greater than the preset pressure, determining that the compressor has high-pressure protection abnormity; if the difference between the exhaust pressure and a preset pressure constant is smaller than the preset pressure, determining that the compressor has no high-pressure protection abnormity; the exhaust pressure of the compressor acquired in a second preset acquisition period is the average value of a plurality of exhaust pressures of the compressor acquired in the second preset acquisition period;
and/or the presence of a gas in the gas,
the determining whether the compressor has a low-pressure protection abnormality based on the collected evaporation temperature includes:
if the collected evaporation temperature is less than a first preset temperature, continuing to collect the evaporation temperature of the evaporator in a third preset collection period, and if the sum of the evaporation temperature and a preset temperature constant is still less than the first preset temperature, determining that the compressor has low-pressure protection abnormity; if the sum of the evaporation temperature and a preset temperature constant is not less than the first preset temperature, determining that the compressor has no low-pressure protection abnormity; the evaporation temperature of the evaporator acquired in a third preset acquisition period is an average value of a plurality of evaporation temperatures of the compressor acquired in the third preset acquisition period.
3. The method of claim 1, wherein determining whether a high-voltage protection fault or a low-voltage protection fault exists for the compressor based on the collected winding temperatures comprises:
if the collected winding temperature is between a second preset temperature and a third preset temperature, determining that the compressor does not have a high-voltage protection fault or a low-voltage protection fault; wherein the second preset temperature is less than the third preset temperature;
and if the acquired winding temperature is lower than the second preset temperature or higher than the third preset temperature, determining that the compressor has a high-voltage protection fault or a low-voltage protection fault.
4. The method according to any one of claims 1-3, wherein the collecting the winding temperature of the motor in the compressor during a first preset collecting period comprises:
determining the running frequency of a motor in the compressor according to the current outdoor temperature, the current indoor temperature and the exhaust pressure or according to the current outdoor temperature, the current indoor temperature and the current evaporation temperature;
and under the operating frequency and the first preset acquisition period, taking the average value of the acquired temperatures of the plurality of windings of the motor in the compressor as the winding temperature of the motor in the first preset acquisition period.
5. Method according to claim 4, characterized in that when determining the operating frequency of the motor in the compressor from the current outdoor temperature, indoor temperature and said discharge pressure:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, PgFor characterizing the exhaust pressure, SwtFor characterizing outdoor temperature; sntThe method comprises the following steps of characterizing indoor temperature, a characterizing a first frequency adjustment parameter, b characterizing a second frequency adjustment parameter and c characterizing a first error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and d is used for representing a first period adjustment parameter;
when determining the operating frequency of the motor in the compressor according to the current outdoor temperature, indoor temperature and the evaporation temperature:
the operating frequency is determined by the following formula:
wherein F is used to characterize the operating frequency, ZtThe device is used for representing the evaporation temperature, e is used for representing a third frequency adjustment parameter, f is used for representing a fourth frequency adjustment parameter, and g is used for representing a second error adjustment parameter;
the first preset acquisition period is determined by the following formula:
wherein, T is used for representing a first preset acquisition period, and h is used for representing a second period adjustment parameter.
6. A control and protection system for a compressor, comprising: the system comprises an evaporator, a condenser, a high-voltage switch, a temperature sensor, a control module and a compressor;
the high-voltage switch is used for triggering when the exhaust pressure of the compressor reaches a preset value so as to send a high-voltage protection abnormal signal generated by triggering to the control module;
the temperature sensor is used for measuring the evaporation temperature of the evaporator;
the evaporator, the condenser and the control module are respectively connected with the compressor;
the control module is applied to the method of claim 1.
7. The system of claim 6, wherein the control module comprises a security protection module and a logic processing module;
the safety protection module comprises an exhaust pressure module, an evaporation temperature module and a motor winding temperature control module; the logic processing module comprises a timer module, an identification module, a confirmation module and an operation module;
the exhaust pressure module is used for detecting and judging exhaust pressure, and outputting a high-pressure protection abnormal signal when the exhaust pressure of the compressor reaches a preset value so as to prevent the compressor from being damaged due to no refrigerant running in the system;
the evaporation temperature module is used for detecting and judging evaporation temperature, and outputting a low-voltage protection abnormal signal when the detected evaporation temperature is lower than a certain temperature value;
the motor winding temperature control module is used for acquiring the winding temperature of the motor;
the logic processing module is used for controlling the running state of the compressor according to the detected exhaust pressure and winding temperature or according to the detected evaporation temperature and winding temperature.
8. The system of claim 7, wherein the motor winding temperature control module is configured to obtain a winding temperature ti of the motor in real time and compare the winding temperature ti with a threshold field [ tmin, tmax ], and if ti is less than or equal to tmin, the refrigeration system is operated according to normal control logic; tmin < ti is less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, compressor frequency decrease;
high pressure pg (pg0, pg1, pg2) pg < pg0, compressor running normally; the rising of the frequency is limited when pg1 is greater than or equal to pg 0; pg2 is greater than pg which is more than or equal to pg 1; stopping the machine when pg is more than or equal to pg 2;
the evaporation temperature tz (tz0, tz1, tz2), tz < tz0, compressor operating normally; tz1 is more than or equal to tz0, so that the frequency rise is limited; tz2, wherein tz is more than or equal to tz1 frequency reduction; and (5) stopping the machine when tz is more than or equal to tz 2.
9. Control protection device of compressor, characterized by, includes:
the first acquisition module is used for acquiring the exhaust pressure of the compressor and the evaporation temperature of the evaporator;
the first determining module is used for determining whether the compressor has high-pressure abnormal protection or not based on the collected exhaust pressure;
the second determination module is used for determining whether the compressor has low-pressure protection abnormity or not based on the collected evaporation temperature;
the second acquisition module is used for acquiring the winding temperature of a motor in the compressor in a first preset acquisition period if the compressor has high-voltage protection abnormity or low-voltage protection abnormity;
the third determining module is used for determining whether the compressor has a high-voltage protection fault or a low-voltage protection fault or not based on the collected winding temperature;
if yes, controlling the running state of the compressor to be set to be a stop state;
and if not, controlling the running state of the compressor to be set to be a normal state.
10. The apparatus of claim 9, wherein the first determining module is configured to:
if the collected exhaust pressure is greater than the preset pressure, continuously collecting the exhaust pressure of the compressor in a second preset collection period, and if the difference between the exhaust pressure and a preset pressure constant is still greater than the preset pressure, determining that the compressor has high-pressure protection abnormity; if the difference between the exhaust pressure and a preset pressure constant is smaller than the preset pressure, determining that the compressor has no high-pressure protection abnormity; the exhaust pressure of the compressor acquired in a second preset acquisition period is the average value of a plurality of exhaust pressures of the compressor acquired in the second preset acquisition period;
and/or the presence of a gas in the gas,
the second determining module is configured to perform the following operations:
if the collected evaporation temperature is less than a first preset temperature, continuing to collect the evaporation temperature of the evaporator in a third preset collection period, and if the sum of the evaporation temperature and a preset temperature constant is still less than the first preset temperature, determining that the compressor has low-pressure protection abnormity; if the sum of the evaporation temperature and a preset temperature constant is not less than the first preset temperature, determining that the compressor has no low-pressure protection abnormity; the evaporation temperature of the evaporator acquired in a third preset acquisition period is an average value of a plurality of evaporation temperatures of the compressor acquired in the third preset acquisition period.
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| CN113028674A (en) * | 2021-03-31 | 2021-06-25 | 四川长虹空调有限公司 | Control protection method of refrigeration system |
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