CN113124431B - Method for detecting air output of range hood - Google Patents
Method for detecting air output of range hood Download PDFInfo
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- CN113124431B CN113124431B CN201911391801.4A CN201911391801A CN113124431B CN 113124431 B CN113124431 B CN 113124431B CN 201911391801 A CN201911391801 A CN 201911391801A CN 113124431 B CN113124431 B CN 113124431B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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Abstract
A method for detecting the air output of a range hood is characterized by comprising the following steps: step one, starting a range hood; step two, whether the range hood is shut down or not is judged; if not, continuing the next step: step three, the main control chip controls the stepping motor and the valve plate to act according to different operation instructions; step four, entering an air output detection subprogram; step five, entering an air output regulation subprogram; and step six, returning the final detection data to the main control chip and returning to the step two. Compared with the prior art, the invention has the advantages that: the detection of the air output of the range hood can be realized only by utilizing the stepping motor for driving the check valve without adopting various sensors, the realization structure is simpler, the detection process is more convenient, the detection result is prevented from being influenced by the pollution or the failure of the sensor, and the detection result is more accurate and reliable.
Description
Technical Field
The invention relates to a range hood device, in particular to a method for detecting the air output of a range hood.
Background
The check valve of the range hood is also called an air outlet or an air outlet, and is provided with the range hood, the bottom of the range hood is fixed on the top of the range hood by screws, and the upper part of the range hood is connected with a plastic telescopic smoke pipe. The main functions of the check valve are to prevent the oil smoke from flowing backwards, prevent the pump and the driving motor from reversing and prevent the oil smoke from being discharged from the container.
At present, most of range hood products adopt a mechanical check valve, when the range hood discharges fume, a valve plate of the check valve is opened by means of wind pressure of an air outlet, when the range hood stops discharging fume, a baffle is closed by means of self gravity of the valve plate, and the fume in a public flue is prevented from flowing backwards. In order to avoid the failure of a mechanical structure and improve the sealing effect, an electric check valve is also adopted, when the range hood is opened, a motor drives a check valve plate to be completely opened, and when the range hood is closed, the motor drives the check valve plate to be completely closed, for example, the existing Chinese invention patent 'an intelligent electric check valve' with the patent number of 201410788893.0 provides an intelligent electric check valve which comprises a check valve bracket, an air duct, a check valve plate, a magnetic sealing ring and an intelligent controller; the air duct is arranged on the check valve bracket; the check valve plate arranged in the air duct is vertical to the axis of the air duct; a pin shaft for rotating the check valve plate is arranged in the air duct; the magnetic sealing rings fixedly arranged on the inner wall of the air duct are composed of two semi-magnetic sealing rings positioned on the upper side and the lower side of the check valve plate and used for sealing a gap between the check valve plate and the inner cavity of the air duct; the intelligent controller is fixed on the non-return valve bracket, is connected with the pin shaft through the coupler and is used for controlling the rotation of the pin shaft, the non-return valve brackets on two sides of the coupler are provided with the micro switch sensors, and the coupler is provided with two contacts which are vertical to each other along the direction vertical to the axis of the coupler.
However, the above-mentioned prior art has the following problems whether a mechanical check valve or an electric check valve is adopted:
1. the check valve in the prior art is opened to the maximum when in work and only has the function of preventing the oil smoke in the common flue from flowing backwards, the check valve cannot detect the air output of the range hood and cannot adjust the check valve to a proper opening size according to the air output of the range hood when in actual work;
2. at present, various sensors are required to be installed for detecting the air output of the range hood, generally, the air output sensor installed at the air outlet of the range hood or the air output sensor installed in a cavity of the range hood is used for sensing, however, in the using process, the detection failure of the sensors is easily caused because a large number of particles which can be attached are contained in the gas exhausted by the range hood.
To sum up, the check valve of the existing range hood only considers the problem of smoke cross, neglects the performance of air exhaust amount, cannot effectively detect the size of air output amount, cannot flexibly adjust the size of the opening of the check valve according to the air output amount, and further influences the oil smoke suction effect of the range hood of each floor of a high-rise residence in the using process, so that further improvement is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing the air output detection method of the range hood, which does not need a sensor and has high detection result reliability, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the detection method for the air output of the range hood is characterized in that a check valve plate of the range hood is driven by a stepping motor capable of driving the valve plate to rotate, and the air output detection method comprises the following steps:
the method comprises the following steps that firstly, the range hood is started, the check valve is reset to a closed state, and then the check valve is opened to a specified angle according to an external instruction;
step two, the main control chip judges whether a shutdown instruction is received, if so, the check valve is closed, and the range hood is shut down; if not, continuing to execute the next step:
step three, the main control chip controls the stepping motor and the valve plate to act according to the following different operation instructions:
a. the main control chip judges whether an air volume detection instruction is received, if so, the fourth step is executed; if not, returning to the step two;
b. the main control chip judges whether an air volume adjusting instruction is received, if so, the fifth step is executed; if not, returning to the step two;
step four, entering an air output detection subprogram:
(4-1) the stepping motor drives the valve plate to rotate by a preset angle lambda in a stepping mode from the current position in the forward direction;
(4-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(4-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(4-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(4-5) the stepping motor drives the valve plate to rotate through a preset angle 2 lambda in a reverse stepping mode;
(4-6) acquiring a corresponding current value I3 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda, and acquiring an air volume value F3 corresponding to the current value I3;
(4-7), the valve plate is driven by the stepping motor to continuously rotate by a preset angle of 2 lambda in a reverse stepping mode;
(4-8) acquiring a corresponding current value I4 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda again, and acquiring an air volume value F4 corresponding to the current value I4;
(4-9) averaging the obtained air quantity value F1, the obtained air quantity value F2, the obtained air quantity value F3 and the obtained air quantity value F4 to obtain final detection data of the air quantity value, and then executing a step six;
step five, entering an air output regulation subprogram:
(5-1) the stepping motor drives the valve plate to rotate by a preset angle lambda in a stepping mode from the current position in the forward direction;
(5-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(5-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(5-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(5-5) judging whether the current air output is close to the target air output value F, if so, executing the step (5-7); if not, continuing to execute the next step;
(5-6) the stepping motor drives the valve plate to rotate by a preset angle beta according to reverse stepping, a corresponding current value I3 ' after the stepping motor rotates by the angle beta is obtained, an air volume value F3 ' corresponding to the current value I3 ' is obtained, and then the step (5-5) is returned;
(5-7) judging whether the current air output reaches a target air output value F, if so, executing the step (5-9); if not, continuing to execute the next step;
(5-8) continuously rotating the valve plate by the stepping motor in a stepping manner by a preset angle beta in the forward direction, obtaining a corresponding current value I4 ' after the stepping motor rotates by the angle beta in the stepping manner, obtaining an air volume value F4 ' corresponding to the current value I4 ', and returning to the step (5-7);
(5-9) stopping adjustment to obtain final detection data of the rotating angle of the stepping motor corresponding to the target air quantity value;
and step six, returning the final detection data to the main control chip and returning to the step two.
In order to improve the angle adjusting efficiency and accelerate the adjusting speed, so that the required air volume value can be achieved more quickly, preferably, the stepping rotation preset angle lambda of the stepping motor is rough adjustment, the value of the lambda can be slightly larger, namely the value range of the lambda is as follows: 2 theta is less than or equal to lambda is less than or equal to 4 theta, wherein theta is the minimum stepping angle of the stepping motor, and lambda is integral multiple of theta.
Preferably, the air volume value F1, the air volume value F2, the air volume value F3, the air volume value F4, the air volume value F3 'and the air volume value F4' may be obtained by initializing a correspondence table between a stepper motor current value and an air volume value which are set in advance in a program. The corresponding relation between the air volume value and the current value is initialized and preset in a program when the air volume value and the current value are set out from a factory, and the corresponding air volume value can be obtained according to the current detected current value through table lookup.
In order to realize accurate control and avoid that the adjusting angle is too large and cannot reach the target air volume value all the time, preferably, the stepping rotation preset angle beta of the stepping motor is fine adjustment, the value of beta is smaller than that of lambda, and the value range of beta is as follows: and theta is not less than theta and not more than 2 theta, wherein theta is the minimum stepping angle of the stepping motor, and beta is integral multiple of theta. After the lambda rough adjustment, the final air volume value can be adjusted to the target air volume value through the beta fine adjustment, and the adjustment precision and accuracy are improved.
Preferably, in the step (5-5), whether the current air output is close to the target air output value F is judged, and the method is implemented by the following steps:
judging whether the detected air quantity values F1 and F2 meet the following conditions: namely F1 < F2 < F or F1 > F2 > F; if the conditions are met, the target air volume value is considered to be close, and the adjusting direction of the stepping motor is correct; if the above condition is not satisfied, the adjustment direction of the stepping motor is wrong. Judging whether the air output is close to a target air quantity value or not, and giving an approximate judgment on whether the current adjusting direction is correct or not, wherein the later fine adjustment is meaningful only if the adjusting direction is right, and if the air output is deviated from the target air quantity value, the adjusting direction needs to be corrected and the adjustment is carried out again; whether or not the detected value is close to the target air value may be determined by setting a threshold range between the detected value and the target value, or may be determined simply by the above-described comparative determination condition of F1 < F2 < F or F1 > F2 > F.
Compared with the prior art, the invention has the advantages that: the detection of the air output of the range hood can be realized only by utilizing a stepping motor for driving a check valve without adopting various sensors, the realization structure is simpler, the detection process is more convenient, the detection result is prevented from being influenced by the pollution or the failure of the sensor, and the detection result is more accurate and reliable; can increase the check valve in this application scheme at any time on original lampblack absorber that does not support the detection amount of wind, it is compatible good for the check valve not only can play and prevent that public flue oil smoke from flowing backward the effect, but also can realize the function of the air output size of detection lampblack absorber, and the range of application is wide.
Drawings
Fig. 1 is a general control flow chart of an air output detection method according to an embodiment of the present invention.
Fig. 2 is one of the sub-flow charts (air output detection sub-routine) of the embodiment of the present invention.
Fig. 3 is a second sub-flowchart (air output adjustment sub-process) of the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The check valve of the range hood of the embodiment has the valve plate with an integrated structure, the valve plate radially penetrates through the rotating shaft, two ends of the rotating shaft of the valve plate are pivoted on the valve body of the check valve, the valve plate can rotate by taking the rotating shaft as a center, the valve plate is driven by the stepping motor, and the rotating shaft of the valve plate is connected with the rotating bearing of the stepping motor. The basic structure of the check valve is the prior art, and the embodiment focuses on a method for controlling the size of an opening of a valve plate of the check valve and detecting the air output of the valve plate in the current opening state.
As shown in fig. 1 to fig. 3, the air output detection method of the present embodiment includes the following steps:
the range hood is started, in order to facilitate detection and ensure that the starting positions of the check valves are consistent (the check valves can not be completely closed after being used for a period of time), the check valves after being started are reset to a closed state at first, then an external input signal (namely an opening angle or air volume signal selected by a user) is waited, the external input signal is converted into a command instruction capable of controlling the action of the check valves through the main control unit, and the check valves are opened to a specified angle according to the command instruction (external instruction).
Step two, the main control chip firstly judges whether a shutdown instruction is received, if so, the check valve is reset to a closed state, the range hood is shut down, and the program is exited; if not, the next step is continuously executed.
Step three, the main control chip controls the stepping motor and the valve plate to act according to the following different operation instructions:
a. the main control chip judges whether an air volume detection instruction is received, namely the air volume under the opening state of the check valve is detected, if so, the fourth step is executed; if not, returning to the step two;
b. the main control chip judges whether an air volume adjusting instruction is received, namely the main control program gives a preset target air volume, the program controls the stepping motor to adjust the valve plate of the check valve to the opening size matched with the target air volume, and if so, the step five is executed; if not, returning to the step two.
And step four, entering an air output detection subprogram, wherein when the valve plate is subjected to the action force of wind, the change of winding current can be generated inevitably, and the size of the air output can be judged by detecting the size of the winding current of the motor, wherein the specific regulation process is as follows:
(4-1) controlling a stepping motor to drive a valve plate to rotate by a preset angle lambda in a forward stepping mode from the current position; the value range of λ in this embodiment is: 2 theta is more than or equal to lambda is less than or equal to 4 theta, wherein theta is the minimum stepping angle of the stepping motor, and lambda is integral multiple of theta;
(4-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(4-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(4-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(4-5) driving the valve plate to rotate by a preset angle of 2 lambda in a reverse stepping mode through the stepping motor, and then returning the valve plate to the initial position;
(4-6) acquiring a corresponding current value I3 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda, and acquiring an air volume value F3 corresponding to the current value I3;
(4-7), driving the valve plate by the stepping motor to continuously rotate by a preset angle of 2 lambda in a reverse stepping mode;
(4-8) acquiring a corresponding current value I4 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda again, and acquiring an air volume value F4 corresponding to the current value I4;
(4-9), four air volume values are obtained at this time: and averaging the four air volume values F1, F2, F3 and F4 which are all near the current position of the valve plate to obtain final detection data of the air volume values, and then executing a step six.
Step five, entering an air output regulation subprogram:
(5-1) driving a valve plate to rotate by a preset angle lambda in a forward stepping mode from the current position through a stepping motor;
(5-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(5-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(5-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(5-5) judging whether the current air output is close to the target air output value F, if so, adjusting the direction correctly, and executing the step (5-7); if not, adjusting the direction to be wrong, and continuing to execute the next step;
judging whether the current air output is close to the target air output value F or not can be simply realized by the following method: judging whether the detected air volume value F1 and air volume value F2 meet the condition that F1 is greater than F2 is greater than F or F1 is greater than F2 is greater than F; if the conditions are met, the target air volume value is considered to be close, and the adjusting direction of the stepping motor is correct; if the above condition is not satisfied, the adjustment direction of the stepping motor is wrong. Judging whether the air output is close to a target air quantity value or not, and giving an approximate judgment on whether the current adjusting direction is correct or not, wherein the later fine adjustment is meaningful only if the adjusting direction is right, and if the air output is deviated from the target air quantity value, the adjusting direction needs to be corrected and the adjustment is carried out again;
(5-6) driving the valve plate to rotate by a preset angle beta according to reverse stepping, obtaining a corresponding current value I3 ' after the stepping rotation of the stepping motor by the angle beta, obtaining an air volume value F3 ' corresponding to the current value I3 ', and returning to the step (5-5); the value range of beta in this example is: beta is more than or equal to theta and less than or equal to 2 theta, wherein theta is the minimum stepping angle of the stepping motor, and beta is an integral multiple of theta;
(5-7) judging whether the current air output reaches a target air output value F, if so, executing the step (5-9); if not, continuing to execute the next step;
(5-8) continuously rotating the valve plate by the stepping motor in a stepping manner by a preset angle beta in the forward direction, obtaining a corresponding current value I4 ' after the stepping motor rotates by the angle beta in the stepping manner, obtaining an air volume value F4 ' corresponding to the current value I4 ', and returning to the step (5-7);
and (5-9) stopping adjustment to obtain final detection data of the rotating angle of the stepping motor corresponding to the target air volume value.
And step six, returning the final detection data to the main control chip and returning to the step two.
In the embodiment, the preset stepping rotation angle λ of the stepping motor is a rough adjustment angle, and in order to improve the adjustment efficiency and accelerate the adjustment speed, the value of λ may be slightly larger, so that the adjustment process can reach the vicinity of the required air volume value more quickly; the step rotation preset angle beta of the stepping motor is fine adjustment, in order to realize accurate control, the value of beta is smaller than lambda, the final air volume value can be adjusted to the target air volume value through rough adjustment of lambda and fine adjustment of beta, the condition that the adjustment angle is too large and cannot reach the target air volume value all the time is avoided, and the adjustment precision and accuracy are finally improved.
In addition, the air volume value F1, the air volume value F2, the air volume value F3, the air volume value F4, the air volume value F3 'and the air volume value F4' obtained according to the current value of the stepping motor in the embodiment can be obtained according to a correspondence table initializing the current value and the air volume value of the stepping motor preset in a program, and the correspondence between the air volume value and the current value is initialized and preset in the program at the time of factory setting, and the corresponding air volume value can be obtained according to the current detected current value through table lookup.
This embodiment need not to set up the sensor in addition, realizes the detection of air volume value and the adjustment of air volume value through control step motor's step angle, and the detection mode is simple easily to be realized, and the testing result accuracy is high.
Claims (5)
1. The detection method for the air output of the range hood is characterized in that a check valve plate of the range hood is driven by a stepping motor capable of driving the valve plate to rotate, and the air output detection method comprises the following steps:
the method comprises the following steps that firstly, the range hood is started, and the check valve is opened to a specified angle according to an external instruction;
step two, the main control chip judges whether a shutdown instruction is received, if so, the check valve is closed, and the range hood is shut down; if not, continuing to execute the next step:
step three, the main control chip controls the stepping motor and the valve plate to act according to the following different operation instructions:
a. the main control chip judges whether an air volume detection instruction is received, if so, the fourth step is executed; if not, returning to the step two;
b. the main control chip judges whether an air volume adjusting instruction is received, if so, the fifth step is executed; if not, returning to the step two;
step four, entering an air output detection subprogram:
(4-1) the stepping motor drives the valve plate to rotate by a preset angle lambda in a stepping mode from the current position in the forward direction;
(4-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(4-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(4-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(4-5) the stepping motor drives the valve plate to rotate through a preset angle 2 lambda in a reverse stepping mode;
(4-6) acquiring a corresponding current value I3 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda, and acquiring an air volume value F3 corresponding to the current value I3;
(4-7), the valve plate is driven by the stepping motor to continuously rotate by a preset angle of 2 lambda in a reverse stepping mode;
(4-8) acquiring a corresponding current value I4 after the stepping motor rotates in a reverse stepping mode by an angle of 2 lambda again, and acquiring an air volume value F4 corresponding to the current value I4;
(4-9) averaging the obtained air quantity value F1, the obtained air quantity value F2, the obtained air quantity value F3 and the obtained air quantity value F4 to obtain final detection data of the air quantity value, and then executing a step six;
step five, entering an air output regulation subprogram:
(5-1) the stepping motor drives the valve plate to rotate by a preset angle lambda in a stepping mode from the current position in the forward direction;
(5-2) acquiring a corresponding current value I1 after the stepping motor rotates by the angle lambda in a stepping manner, and acquiring an air volume value F1 corresponding to the current value I1;
(5-3) driving the valve piece to continuously rotate by a preset angle lambda in a forward stepping mode by the stepping motor;
(5-4) acquiring a corresponding current value I2 after the stepping motor rotates the lambda angle again in a stepping mode, and acquiring an air volume value F2 corresponding to the current value I2;
(5-5) judging whether the current air output is close to the target air output value F, if so, executing the step (5-7); if not, continuing to execute the next step;
(5-6) the stepping motor drives the valve plate to rotate by a preset angle beta according to reverse stepping, a corresponding current value I3 ' after the stepping motor rotates by the angle beta is obtained, an air volume value F3 ' corresponding to the current value I3 ' is obtained, and then the step (5-5) is returned;
(5-7) judging whether the current air output reaches a target air output value F, if so, executing the step (5-9); if not, continuing to execute the next step;
(5-8) continuously rotating the valve plate by the stepping motor in a stepping manner by a preset angle beta in the forward direction, obtaining a corresponding current value I4 ' after the stepping motor rotates by the angle beta in the stepping manner, obtaining an air volume value F4 ' corresponding to the current value I4 ', and returning to the step (5-7);
(5-9) stopping adjustment to obtain final detection data of the rotating angle of the stepping motor corresponding to the target air quantity value;
and step six, returning the final detection data to the main control chip and returning to the step two.
2. The method for detecting the air output of the range hood according to claim 1, characterized in that: the value range of the stepping rotation preset angle lambda of the stepping motor is as follows: 2 theta is less than or equal to lambda is less than or equal to 4 theta, wherein theta is the minimum stepping angle of the stepping motor, and lambda is integral multiple of theta.
3. The method for detecting the air output of the range hood according to claim 1, characterized in that: the air volume value F1, the air volume value F2, the air volume value F3, the air volume value F4, the air volume value F3 'and the air volume value F4' may be obtained according to a correspondence table between a stepping motor current value and an air volume value initialized and preset in a program.
4. The method for detecting the air output of the range hood according to claim 1, characterized in that: the value range of the stepping rotation preset angle beta of the stepping motor is as follows: and theta is not less than theta and not more than 2 theta, wherein theta is the minimum stepping angle of the stepping motor, and beta is integral multiple of theta.
5. The method for detecting the air output of the range hood according to claim 1, characterized in that: in the step (5-5), whether the current air output is close to the target air value F is judged, and the method is realized by the following steps:
judging whether the detected air quantity values F1 and F2 meet the following conditions: namely F1 < F2 < F or F1 > F2 > F; if the conditions are met, the target air volume value is considered to be close, and the adjusting direction of the stepping motor is correct; if the above condition is not satisfied, the adjustment direction of the stepping motor is wrong.
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