CN112503811B - Control method of electronic expansion valve and heat pump system - Google Patents

Control method of electronic expansion valve and heat pump system Download PDF

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Publication number
CN112503811B
CN112503811B CN202011439799.6A CN202011439799A CN112503811B CN 112503811 B CN112503811 B CN 112503811B CN 202011439799 A CN202011439799 A CN 202011439799A CN 112503811 B CN112503811 B CN 112503811B
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Prior art keywords
expansion valve
electronic expansion
heat pump
pump system
opening degree
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CN112503811A (en
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栾坤鹏
张瀛龙
苏培焕
刘帅
王芳
邵继
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides aA control method of an electronic expansion valve and a heat pump system are provided. The control method of the electronic expansion valve includes: starting a heat pump system; calculating the current opening degree B of the primary electronic expansion valve in the adjustment period delta T of each electronic expansion valvekAnd according to the current opening degree B obtained by calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget(ii) a According to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjustment period delta T, and calculating the current opening degree B according to the optimized adjustment period delta Tk. The control method of the electronic expansion valve solves the problem that the control method of the electronic expansion valve in the prior art cannot be suitable for all working conditions, so that the air conditioning system always vibrates at low temperature or high temperature.

Description

Control method of electronic expansion valve and heat pump system
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a control method of an electronic expansion valve and a heat pump system.
Background
In the operation process of the heat pump air conditioner, the control of the electronic expansion valve is very critical, and the operation reliability and the economical efficiency of the whole system are directly influenced. At present, an electronic expansion valve is controlled by exhaust superheat degree or a target exhaust temperature value when a heat pump air conditioner heats; among them, it is a common method to control the electronic expansion valve by exhausting superheat degree.
However, when the temperature of the environment in which the heat pump air conditioner operates is extremely high or extremely low, in this case, the air conditioning system with the exhaust superheat degree control vibrates, and cannot be stable for a long time. At present, when the actual exhaust superheat degree is larger than or smaller than the target superheat degree, the opening degree of the electronic expansion valve is correspondingly opened or closed in fixed adjusting time according to given logic, and the control mode can be suitable for a certain working condition to stabilize a heat pump system, but cannot be suitable for all working conditions. Moreover, the system vibrates for a long time, which affects the economy, reliability and comfort of the system operation.
Disclosure of Invention
The invention mainly aims to provide a control method of an electronic expansion valve and a heat pump system, and aims to solve the problem that the control method of the electronic expansion valve in the prior art cannot be suitable for all working conditions, so that an air conditioning system always vibrates at low temperature or high temperature.
In order to achieve the above object, according to one aspect of the present invention, there is provided a control method of an electronic expansion valve, comprising: starting a heat pump system; calculating the current opening degree B of the primary electronic expansion valve in the adjustment period delta T of each electronic expansion valvekAnd according to the current opening degree B obtained by calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget(ii) a According to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjustment period delta T, and calculating the current opening degree B according to the optimized adjustment period delta Tk。
Further, according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofThe method for optimizing the adjustment period delta T comprises the following steps: according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1Maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2The adjustment period deltat is optimized.
Further, according to the minimum actual exhaust superheat SH of the heat pump system in the preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1Maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2Optimizing the adjustment period Δ T, including: in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) At > 1, according to Δ T (SH)Is actually big-SHIs small in practice)/(t2-t1) Calculating an optimized adjustment period delta T; in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) When the adjustment period is less than or equal to 1, the adjustment period delta T is unchanged.
Further, the superheat SH of the exhaust gas is actually calculated according to the actual exhaust gas superheat of the heat pump system during operationPractice ofBefore optimizing the adjustment period Δ T, the control method of the electronic expansion valve further includes: recording the exhaust temperature T of the heat pump system during operationRow boardAnd the exhaust temperature TRow boardCorresponding operation time to obtain the maximum exhaust temperature T in the preset operation timeArrange bigAnd minimum exhaust temperature TIs small in rowAnd obtaining the maximum exhaust temperature TArrange bigCorresponding first operating time t1And minimum exhaust temperature TIs small in rowCorresponding second operating time t2(ii) a According to the maximum exhaust temperature TArrange bigCalculating the maximum actual exhaust superheat SHIs actually bigAnd according to the minimum exhaust temperature TIs small in rowCalculating the minimum actual exhaust superheat SHIs small in practice。
Further, the superheat SH of the exhaust gas is actually calculated according to the actual exhaust gas superheat of the heat pump system during operationPractice ofAfter optimizing the adjustment period Δ T, the control method of the electronic expansion valve further includes: the indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T of the heat pump system in the operating environmentOuter coverExpanding the temperature range as a reference to obtain an outdoor ambient temperature range; matching and storing the optimized adjustment period delta T with the indoor environment temperature range and the outdoor environment temperature range so as to adjust the current opening degree B of the electronic expansion valve according to the optimized adjustment period delta T when the heat pump system is started in the indoor environment temperature range and the outdoor environment temperature rangek。
Further, during the adjustment cycle of each electronic expansion valveCalculating the current opening degree B of the primary electronic expansion valve in the period delta TkAnd according to the current opening degree B obtained by calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTargetPreviously, the control method of the electronic expansion valve further includes: controlling the electronic expansion valve to have an initial opening BFirst stageFor a predetermined time.
Further, the electronic expansion valve is controlled to have an initial opening BFirst stageThe control method of the electronic expansion valve further includes, after operating for a predetermined time, the step of: according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the initial opening degree BFirst stage(ii) a The indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T of the heat pump system in the operating environmentOuter coverExpanding the temperature range as a reference to obtain an outdoor ambient temperature range; the optimized initial opening degree BFirst stageIs matched with the indoor environment temperature range and the outdoor environment temperature range and is stored so as to control the electronic expansion valve to optimize the initial opening degree B when the heat pump system is opened in the indoor environment temperature range and the outdoor environment temperature rangeFirst stageFor a predetermined time.
Further, according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the initial opening degree BFirst stageThe method comprises the following steps: according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stage。
Further, according to the minimum actual exhaust superheat SH of the heat pump system in the preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stageThe method comprises the following steps: in calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetAt > 2, according to BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage(ii) a In calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen < -2 > is in accordance with BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage(ii) a After calculating | (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen | < 2, the initial opening degree BFirst stageAnd is not changed.
Further, the electronic expansion valve is controlled to have an initial opening BFirst stageThe control method of the electronic expansion valve before the predetermined time is operated further includes: obtaining indoor ambient temperature T in operating environment of heat pump systemInner partAnd outdoor ambient temperature TOuter coverAnd according to the indoor ambient temperature TInner partAnd outdoor ambient temperature TOuter coverCalculating the initial opening degree BFirst stage。
Further, according to the indoor ambient temperature TInner partAnd outdoor ambient temperature TOuter coverCalculating an initial opening degree BFirst stageThe method comprises the following steps: according to the indoor ambient temperature TInner partAnd outdoor ambient temperature TOuter coverCalculating the initial opening B by an operation formulaFirst stage(ii) a Wherein, the operation formula is: b isFirst stage＝150+(TInner part+TOuter cover)*5。
Further, the current opening degree B of the electronic expansion valve is calculated once in each adjusting period delta T of the electronic expansion valvekThe method comprises the following steps: calculating the current opening degree B of the electronic expansion valve once in each adjusting period delta T according to the operation criterion of the electronic expansion valvek(ii) a The operating criteria are: b isk＝Bk-1+ΔBk(ii) a When SH is presentDeviation ofWhen > 5,. DELTA.Bk10; when-5 is less than or equal to SHDeviation ofWhen the value is less than or equal to 5, delta Bk0; when SH is presentDeviation ofWhen less than-5, delta Bk-10; wherein, Bk-1Opening degree of the electronic expansion valve for the previous adjustment period delta T, and exhaust superheat deviation value SHDeviation ofFor the actual degree of superheat SH of the exhaust gasPractice ofWith the target degree of superheat SH of exhaust gasTargetThe difference between them.
According to another aspect of the present invention, there is provided a heat pump system including: the compressor is provided with an exhaust pipe at an exhaust port; an electronic expansion valve; an exhaust temperature detecting member provided on the exhaust pipe to detect an exhaust temperature of the compressor; and a pressure detecting member provided on the discharge pipe to detect a discharge pressure of the compressor.
Further, the heat pump system further includes: the indoor environment temperature detection piece is arranged on the indoor side of the heat pump system to detect the indoor environment temperature in the operating environment of the heat pump system; and the outdoor environment temperature detection piece is arranged outside the heat pump system to detect the outdoor environment temperature of the operating environment of the heat pump system.
After the heat pump system is started, the current opening degree B of the electronic expansion valve is calculated once in each adjusting period delta TkAnd based on the value B obtained by calculationkTo adjust the opening degree of the electronic expansion valve, i.e. to adjust the opening degree of the electronic expansion valve to BkSo as to ensure the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget(ii) a Meanwhile, according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjustment period delta T, and enabling the optimized adjustment period delta T to replace the adjustment period delta T in use, so that the current opening degree B of the electronic expansion valve is calculated once in each optimized adjustment period delta Tk. The setting enables the adjustment period delta T of the electronic expansion valve to be adjusted in real time according to the running condition of the heat pump system, so as to eliminate the oscillation of the heat pump system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a flow chart of an embodiment of a control method of an electronic expansion valve according to the invention;
fig. 2 shows a schematic view of an embodiment of a heat pump system according to the invention.
Wherein the figures include the following reference numerals:
1. a compressor; 2. an indoor heat exchanger; 3. an outdoor heat exchanger; 4. an electronic expansion valve; 5. a four-way valve; 6. a pressure detecting member; 7. an exhaust temperature detecting member; 8. an outdoor ambient temperature detection member; 9. indoor ambient temperature detects piece.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The present invention provides a control method of an electronic expansion valve, please refer to fig. 1, which includes:
step S100, starting a heat pump system;
step S200, calculating the current opening degree B of the electronic expansion valve once in the adjusting period delta T of each electronic expansion valvekAnd according to the current opening degree B obtained by calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget；
Step S300, according to the fact that the heat pump system is in the operation processSuperheat degree of intercalary exhaust SHPractice ofOptimizing the adjustment period delta T, and calculating the current opening degree B according to the optimized adjustment period delta Tk。
After the heat pump system is started, the current opening degree B of the electronic expansion valve is calculated once in each adjusting period delta TkAnd based on the value B obtained by calculationkTo adjust the opening degree of the electronic expansion valve, i.e. to adjust the opening degree of the electronic expansion valve to BkSo as to ensure the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget(ii) a Meanwhile, according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjustment period delta T, and enabling the optimized adjustment period delta T to replace the adjustment period delta T in use, so that the current opening degree B of the electronic expansion valve is calculated once in each optimized adjustment period delta Tk. The setting enables the adjustment period delta T of the electronic expansion valve to be adjusted in real time according to the running condition of the heat pump system, so as to eliminate the oscillation of the heat pump system.
Specifically, optimizing the adjustment period Δ T means obtaining an optimal adjustment period Δ T during the operation of the heat pump system, where the optimal adjustment period Δ T may be equal to the adjustment period Δ T being used, or may be a new adjustment period Δ T calculated. The optimal adjustment period delta T can avoid the oscillation of the heat pump system. The following optimum adjustment period Δ T is the same as that described here.
In the embodiment, the superheat SH of the exhaust gas is actually calculated according to the actual superheat of the heat pump system during operationPractice ofThe method for optimizing the adjustment period delta T comprises the following steps: according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1Maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2The adjustment period deltat is optimized.
In the present embodiment, according to the heat pump systemMinimum actual exhaust superheat SH for a predetermined operating timeIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1Maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2Optimizing the adjustment period Δ T, including: in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) At > 1, according to Δ T (SH)Is actually big-SHIs small in practice)/(t2-t1) Calculating an optimized adjustment period delta T; in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) When the adjustment period is less than or equal to 1, the adjustment period delta T is unchanged. Thus, in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) After the adjustment period is more than 1, calculating the current opening degree B of the electronic expansion valve once in each optimized adjustment period delta TkAnd the optimized adjusting period Delta T is the calculation formula Delta T (SH)Is actually big-SHIs small in practice)/(t2-t1) The calculation result of (2); in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) When the current opening degree B of the electronic expansion valve is less than or equal to 1, calculating the current opening degree B of the electronic expansion valve once in each used adjusting period delta Tk。
Specifically, the predetermined operation time period is 20 minutes to 1 hour.
Specifically, in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) > 1, and according to Δ T (SH)Is actually big-SHIs small in practice)/(t2-t1) And when the calculated optimized adjustment period delta T is less than 0.5 minute, recording the optimized adjustment period delta T as 0.5 min. The setting avoids the adjustment period delta T of the electronic expansion valve to be smaller, further avoids the rapid change of the opening degree of the electronic expansion valve, and avoids the problem of system oscillation caused by frequent change of the opening degree of the electronic expansion valve of the heat pump system.
In the present embodiment, the superheat SH of the exhaust gas is actually changed during the operation of the heat pump systemPractice ofOptimization of cycle of adjustmentBefore the period Δ T, the control method of the electronic expansion valve further includes: recording the exhaust temperature T of the heat pump system during operationRow boardAnd the exhaust temperature TRow boardCorresponding operation time to obtain the maximum exhaust temperature T in the preset operation timeArrange bigAnd minimum exhaust temperature TIs small in rowAnd obtaining the maximum exhaust temperature TArrange bigCorresponding first operating time t1And minimum exhaust temperature TIs small in rowCorresponding second operating time t2(ii) a According to the maximum exhaust temperature TArrange bigCalculating the maximum actual exhaust superheat SHIs actually bigAnd according to the minimum exhaust temperature TIs small in rowCalculating the minimum actual exhaust superheat SHIs small in practice。
Specifically, the control method of the electronic expansion valve further includes: detecting the exhaust pressure P of the heat pump system in the operation processRow board(ii) a Calculating the exhaust pressure P according to the introduced saturation temperature AD conversion tableRow boardCorresponding saturation temperature TCoagulation of water(ii) a Actual degree of superheat SH of exhaust gasPractice ofIs the exhaust temperature TRow boardMinus the saturation temperature TCoagulation of water。
Corresponding, SHIs actually big＝TArrange big-TCoagulation of water；SHIs small in practice＝TIs small in row-TCoagulation of water。
In the present embodiment, the superheat SH of the exhaust gas is actually changed during the operation of the heat pump systemPractice ofAfter optimizing the adjustment period Δ T, the control method of the electronic expansion valve further includes: the indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T of the heat pump system in the operating environmentOuter coverExpanding the temperature range as a reference to obtain an outdoor ambient temperature range; matching and storing the optimized adjustment period delta T with the indoor environment temperature range and the outdoor environment temperature range so as to calculate the current opening degree B of the electronic expansion valve according to the optimized adjustment period delta T when the heat pump system is started in the indoor environment temperature range and the outdoor environment temperature rangek. Such an arrangement quickly achieves a one at the next start-up of the heat pump systemThe adjusting period delta T of the electronic expansion valve is better, so that the heat pump system is quickly stabilized, the heat pump system is flexibly suitable for the load and is stabilized in a proper range, and the energy efficiency of the system is improved.
Specifically, the indoor ambient temperature range is TInner partPlus or minus 1 ℃; outdoor ambient temperature range of TOuter cover±1℃。
In the present embodiment, the current opening degree B of the electronic expansion valve is adjusted once every adjustment period Δ T of the electronic expansion valvekSo as to ensure the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTargetPreviously, the control method of the electronic expansion valve further includes: controlling the electronic expansion valve to have an initial opening BFirst stageFor a predetermined time. B isFirst stageThe initial opening degree of the electronic expansion valve is the initial opening degree of the heat pump system after the heat pump system is started.
Specifically, the predetermined time is 3min to 10 min.
In the present embodiment, the electronic expansion valve is controlled to have the initial opening degree BFirst stageThe control method of the electronic expansion valve further includes, after operating for a predetermined time, the step of: according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the initial opening degree BFirst stage(ii) a The indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T outside the operating environment of the heat pump system is used as a reference to expand the temperature range so as to obtain the outdoor environment temperature range; the optimized initial opening degree BFirst stageIs matched with the indoor environment temperature range and the outdoor environment temperature range and is stored so as to control the electronic expansion valve to optimize the initial opening degree B when the heat pump system is opened in the indoor environment temperature range and the outdoor environment temperature rangeFirst stageFor a predetermined time. Therefore, the heat pump system can be quickly and stably, the system can flexibly adapt to the load and is stabilized in a proper range, and the energy efficiency of the system is improved.
Specifically, the initial opening degree B is optimizedFirst stageThe optimal initial opening degree B is obtained when the heat pump system is started next time in the operation processFirst stageThe optimal initialOpening degree BFirst stageCan be matched with the initial opening B of the start-upFirst stageEqual or a new calculated initial opening BFirst stage. The optimum initial opening degree BFirst stageThe system can be quickly stabilized after the system is started next time. Further, the following optimized initial opening degree BFirst stageAs used herein.
In the embodiment, the superheat SH of the exhaust gas is actually calculated according to the actual superheat of the heat pump system during operationPractice ofOptimizing the initial opening degree BFirst stageThe method comprises the following steps: according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stage。
In the present embodiment, the minimum actual degree of superheat SH of exhaust gas in accordance with the heat pump system in a predetermined operation periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stageThe method comprises the following steps: in calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetAt > 2, according to BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage(ii) a In calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen < -2 > is in accordance with BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage(ii) a After calculating | (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen | < 2, the initial opening degree B is unchanged. Thus, in calculating (SH)Is actually big+SHIs small in practice)/2-SHTarget> 2 and (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen < -2 >, the initial opening degree B of the electronic expansion valve is opened when the heat pump system is opened in the indoor environment temperature range and the outdoor environment temperature rangeFirst stageIs a calculation formula BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetThe calculated value(ii) a After calculating | (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen | < 2, when the heat pump system is started in the indoor environment temperature range and the outdoor environment temperature range, the initial opening degree BFirst stageAnd is not changed.
It should be noted that the present application is not directed to a specific refrigerant system, and therefore the above control logic, example "(SH)Is actually big+SHIs small in practice)/2-SHTargetThe limit values such as 2 in 2 can be optimized according to actual conditions.
In the present embodiment, the electronic expansion valve is controlled to have the initial opening degree BFirst stageThe control method of the electronic expansion valve before the predetermined time is operated further includes: obtaining indoor ambient temperature T in operating environment of heat pump systemInner partAnd outdoor ambient temperature TOuter coverAnd according to the indoor ambient temperature TInner partAnd outdoor ambient temperature TOuter coverCalculating the initial opening degree BFirst stage。
In the present embodiment, the temperature T depends on the indoor environmentInner partAnd outdoor ambient temperature TOuter coverCalculating an initial opening degree BFirst stageThe method comprises the following steps: according to the indoor ambient temperature TInner partAnd outdoor ambient temperature TOuter coverCalculating the initial opening B by an operation formulaFirst stage(ii) a Wherein, the operation formula is: b isFirst stage＝150+(TInner part+TOuter cover)*5。
In the present embodiment, the current opening degree B of the electronic expansion valve is calculated once for each adjustment period Δ T of the electronic expansion valvekThe method comprises the following steps: calculating the current opening degree B of the electronic expansion valve in each adjustment period delta T according to the operation criteria of the electronic expansion valvek(ii) a The operating criteria are:
Bk＝Bk-1+ΔBk；
when SH is presentDeviation ofWhen > 5,. DELTA.Bk＝10；
When-5 is less than or equal to SHDeviation ofWhen the value is less than or equal to 5, delta Bk＝0；
When SH is presentDeviation ofWhen less than-5, delta Bk＝-10；
Wherein, Bk-1Opening degree of the electronic expansion valve for the previous adjustment period delta T, and exhaust superheat deviation value SHDeviation ofFor the actual degree of superheat SH of the exhaust gasPractice ofWith the target degree of superheat SH of exhaust gasTargetThe difference between them; delta BkIs the opening degree variation.
Specifically, Bk-1The opening degree of the electronic expansion valve in the previous adjustment period Δ T means that the adjustment period Δ T adjacent to the current adjustment period Δ T is the adjustment period Δ T before the current adjustment period Δ T. Target degree of superheat SH of exhaust gasTargetThe superheat degree required by the heat pump system is preset in advance.
In one embodiment, when the heat pump system begins to operate, the compressor is powered on, and the electronic expansion valve is at BFirst stage＝150+(TInner part+TOuter cover) 5 start run for 3min and the number of steps remains unchanged. After 3min, the operating criteria of the electronic expansion valve were as follows:
once per time Δ T, Bk＝Bk-1+ΔBk；
When SH is presentDeviation ofWhen > 5,. DELTA.Bk＝10；
When-5 is less than or equal to SHDeviation ofWhen the value is less than or equal to 5, delta Bk＝0；
When SH is presentDeviation ofWhen less than-5, delta Bk＝-10；
And, after 3min, the recording of the exhaust temperature T is startedRow boardAnd obtaining T within a predetermined operating time periodArrange big、TIs small in row、SHIs small in practice、SHIs actually big、t2、t1。
If SHIs actually big+SHIs small in practice)/2-SHTargetWhen the superheat degree of the exhaust gas is more than 2, the superheat degree of the exhaust gas deviates from the target superheat degree SH in the positive directionTargetWhen the temperature of the indoor environment and the outdoor environment is +/-1 ℃ next time, the optimized initial opening degree B is usedFirst stage：BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetAnd (5) operating.
If (SH)Is actually big+SHIs small in practice)/2-SHTarget< -2 >, when the exhaust superheat degree deviates from the target in negative directionHeat of reaction SHTargetWhen the temperature of the indoor environment and the outdoor environment is +/-1 ℃ next time, the optimized initial opening degree B is usedFirst stage：BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetAnd (5) operating.
If (SH)Is actually big+SHIs small in practice)/2-SHTargetThe I is less than or equal to 2, the exhaust superheat degree meets the system operation fluctuation range, and the initial opening degree of the electronic expansion valve is kept unchanged when the indoor and outdoor environment temperature is +/-1 ℃ next time.
When the above determination is satisfied, the electronic expansion valve BFirst stageThe optimization is completed, the heat pump system can learn by itself, and therefore the optimal initial opening degree of the electronic expansion valve is provided under different working conditions, the system can rapidly fluctuate in a proper exhaust superheat degree interval, and the service life and the reliability of system components are improved. After completing the initial opening B of the electronic expansion valveFirst stageWhile optimizing, the following operations are carried out:
if (SH)Is actually big-SHIs small in practice)/(t2-t1) When the pressure is more than 1;
the optimized adjustment period delta T is as follows: Δ T (SH)Is actually big-SHIs small in practice)/(t2-t1)；
If (SH)Is actually big-SHIs small in practice)/(t2-t1) When the adjustment period is less than or equal to 1, the adjustment period delta T is kept unchanged.
And when the above conditions are met, optimizing the adjustment period delta T of the electronic expansion valve, and updating the adjustment period delta T of the electronic expansion valve corresponding to the indoor and outdoor environment temperature of +/-1 ℃.
The present invention also provides a heat pump system, please refer to fig. 2, the heat pump system is suitable for the control method of the electronic expansion valve in the above embodiment, the heat pump system includes: the compressor comprises a compressor 1, wherein an exhaust pipe is arranged at an exhaust port of the compressor 1; an electronic expansion valve 4; an exhaust temperature detecting member 7 provided on the exhaust pipe to detect an exhaust temperature of the compressor 1; and a pressure detecting member 6 provided on the discharge pipe to detect a discharge pressure of the compressor 1.
Specifically, the pressure detection element 6 detects the exhaust pressure PRow board(ii) a The exhaust temperature detector 7 detects the exhaust temperature TRow board。
In this embodiment, the heat pump system further includes a connection pipeline, the exhaust pipe is a part of the connection pipeline, and the compressor 1 and the electronic expansion valve 4 are both disposed on the connection pipeline; the heat pump system further comprises a four-way valve 5, an indoor heat exchanger 2 and an outdoor heat exchanger 3, the four-way valve 5, the indoor heat exchanger 2 and the outdoor heat exchanger 3 are all arranged on a connecting pipeline, the four-way valve 5 is arranged between the compressor 1 and the indoor heat exchanger 2 and between the compressor 1 and the outdoor heat exchanger 3, an electronic expansion valve 4 is arranged between the indoor heat exchanger 2 and the outdoor heat exchanger 3, the electronic expansion valve 4 is located on one side, away from the four-way valve 5, of the indoor heat exchanger 2, and the electronic expansion valve 4 is located on one side, away from the four-way valve 5, of the outdoor heat exchanger 3.
Specifically, the pressure detecting member 6 is a high-pressure sensor; the exhaust temperature detector 7 is a bulb.
In this embodiment, the heat pump system further includes: an indoor ambient temperature detector 9 disposed at an indoor side of the heat pump system to detect an indoor ambient temperature in an operating environment of the heat pump system; and the outdoor environment temperature detection part 8 is arranged at the outdoor side of the heat pump system to detect the outdoor environment temperature under the operation environment of the heat pump system. Wherein the indoor environment temperature detecting member 9 detects the indoor environment temperature TInner part(ii) a The outdoor environment temperature detector 8 detects the outdoor environment temperature TOuter cover。
Specifically, the indoor ambient temperature detector 9 and the outdoor ambient temperature detector 8 are both temperature-sensing bulbs.
The application solves the following technical problems: the control method solves the problems that the control method of the electronic expansion valve can not be suitable for all working conditions and always vibrates at low temperature or high temperature in the heating or refrigerating operation process of the heat pump system; the control method solves the problems that the control method of the electronic expansion valve can not be suitable for all working conditions and has longer stabilization time and lower energy efficiency at low temperature or high temperature in the heating or refrigerating operation process of the heat pump system.
The beneficial effect of this application: the operation mode of the electronic expansion valve is controlled to quickly eliminate the oscillation when the heat pump system heats or refrigerates at low temperature, so that the human pump system is stabilized in an optimal range, the problem of overhigh or insufficient superheat degree caused by the oscillation is reduced, the reliability of the whole heat pump system is improved, the impact of the oscillation on the components of the heat pump system is reduced, and the service lives of a compressor, the electronic expansion valve and other components are prolonged. In conclusion, the control method of the electronic expansion valve enables the heat pump system to be suitable for various working conditions, and the heat pump system can be quickly and economically stably realized.
The invention of the application lies in: firstly, under the condition that the heat pump system is in heating or cooling, the adjustment period delta T of the electronic expansion valve can be adjusted in real time according to the operation condition of the heat pump system to eliminate the oscillation of the system. Secondly, under different working condition environments, the initial opening degree B of the electronic expansion valve is adjusted through self-learning of the electronic expansion valveFirst stageTherefore, the heat pump system is fast and stable, the system is flexible to adapt to the load and is stable in a proper range, and the energy efficiency of the system is improved. Thirdly, adjusting period delta T and initial opening degree B after optimizationFirst stageThe temperature of the indoor environment and the outdoor environment is memorized and stored when the temperature is +/-1 ℃, and the updated delta T, B is used when the heat pump system operates next timeFirst stageAnd (6) carrying out adjustment.
The present application mainly describes a method for controlling an electronic expansion valve by the degree of superheat of exhaust gas in a heat pump system, but the present application is also applicable to other methods for controlling an electronic expansion valve.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
after the heat pump system is started, the current opening degree B of the electronic expansion valve is calculated once in each adjusting period delta TkAnd based on the value B obtained by calculationkTo adjust the opening degree of the electronic expansion valve, i.e. to adjust the opening degree of the electronic expansion valve to BkSo as to ensure the actual exhaust superheat SH of the heat pump systemPractice ofStabilize at target exhaust superheat SH of heat pump systemTarget(ii) a Meanwhile, according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjustment period delta T, and enabling the optimized adjustment period delta T to replace the adjustment period delta T in use, so that the current opening degree B of the electronic expansion valve is calculated once in each optimized adjustment period delta Tk. The setting enables the adjustment period delta T of the electronic expansion valve to be adjusted in real time according to the running condition of the heat pump system, so as to eliminate the oscillation of the heat pump system.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A control method of an electronic expansion valve, comprising:
starting a heat pump system;
calculating the current opening degree B of each electronic expansion valve once in the adjustment period delta T of the electronic expansion valvekAnd obtaining the current opening degree B according to the calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilizing the target degree of superheat SH of exhaust gas in the heat pump systemTarget；
According to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the adjusting period delta T, and calculating the current opening degree B according to the optimized adjusting period delta Tk；
Wherein the actual degree of superheat SH of exhaust gas in the operation process of the heat pump system is used as the basisPractice ofThe method for optimizing the adjustment period Δ T includes:
according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd the minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1The maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2Optimizing the adjustment period Δ T.
2. The control method of an electronic expansion valve according to claim 1, wherein the control method is based on a minimum actual time of the heat pump system within a predetermined operating periodDegree of superheat SH of exhaust gasIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd the minimum actual exhaust superheat SHIs small in practiceCorresponding first operating time t1The maximum actual exhaust superheat SHIs actually bigCorresponding second operating time t2Optimizing the adjustment period Δ T, including:
in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) At > 1, according to Δ T (SH)Is actually big-SHIs small in practice)/(t2-t1) Calculating the optimized adjustment period delta T;
in calculating (SH)Is actually big-SHIs small in practice)/(t2-t1) When the adjustment period is less than or equal to 1, the adjustment period delta T is unchanged.
3. The control method of the electronic expansion valve according to claim 1, wherein the actual degree of superheat SH of exhaust gas during the operation of the heat pump system is used as the basisPractice ofBefore optimizing the adjustment period Δ Τ, the control method of the electronic expansion valve further comprises:
recording the exhaust temperature T of the heat pump system during operationRow boardAnd the exhaust gas temperature TRow boardCorresponding operation time to obtain the maximum exhaust temperature T in the preset operation timeArrange bigAnd minimum exhaust temperature TIs small in rowAnd obtaining the maximum exhaust temperature TArrange bigThe corresponding first running time t1And the minimum exhaust temperature TIs small in rowThe corresponding second running time t2；
According to said maximum exhaust temperature TArrange bigCalculating the maximum actual exhaust superheat SHIs actually bigAnd according to said minimum exhaust temperature TIs small in rowCalculating the minimum actual exhaust superheat SHIs small in practice。
4. The control method of an electronic expansion valve according to claim 1, wherein the control method is based onThe actual degree of superheat SH of the exhaust gas of the heat pump system during operationPractice ofAfter optimizing the adjustment period Δ Τ, the control method of the electronic expansion valve further includes:
setting the indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T of the heat pump system in the running environmentOuter coverExpanding the temperature range as a reference to obtain an outdoor ambient temperature range;
matching and storing the optimized adjustment period delta T with the indoor environment temperature range and the outdoor environment temperature range, so that when the heat pump system is started in the indoor environment temperature range and the outdoor environment temperature range, the current opening degree B of the electronic expansion valve is adjusted according to the optimized adjustment period delta Tk。
5. Method for controlling an electronic expansion valve according to any of claims 1 to 4, characterized in that the current opening degree B of the electronic expansion valve is calculated once during the adjustment period Δ T of each electronic expansion valvekAnd obtaining the current opening degree B according to the calculationkAdjusting the opening degree of the electronic expansion valve to ensure that the actual exhaust superheat SH of the heat pump systemPractice ofStabilizing the target degree of superheat SH of exhaust gas in the heat pump systemTargetPreviously, the control method of the electronic expansion valve further includes:
controlling the electronic expansion valve to have an initial opening degree BFirst stageFor a predetermined time.
6. The control method of an electronic expansion valve according to claim 5, wherein the electronic expansion valve is controlled to have an initial opening degree BFirst stageThe control method of the electronic expansion valve further includes, after operating for a predetermined time, the step of:
according to the actual exhaust superheat SH of the heat pump system in the operation processPractice ofOptimizing the initial opening degree BFirst stage；
Setting the indoor ambient temperature T of the heat pump system in the operating environmentInner partExpanding the temperature range as a reference to obtain an indoor ambient temperature range; and the outdoor environment temperature T of the heat pump system in the running environmentOuter coverExpanding the temperature range as a reference to obtain an outdoor ambient temperature range;
the optimized initial opening degree BFirst stageMatching and storing the indoor environment temperature range and the outdoor environment temperature range, so as to control the electronic expansion valve to have the optimized initial opening degree B when the heat pump system is opened in the indoor environment temperature range and the outdoor environment temperature rangeFirst stageAnd operating the preset time.
7. The control method of the electronic expansion valve according to claim 6, wherein the actual degree of superheat SH of exhaust gas during operation of the heat pump system is based onPractice ofOptimizing the initial opening degree BFirst stageThe method comprises the following steps:
according to the minimum actual exhaust superheat SH of the heat pump system in a preset operation time periodIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd the target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stage。
8. The control method of an electronic expansion valve according to claim 7, characterized in that the minimum actual exhaust superheat SH of the heat pump system in a predetermined operation period is used as a function ofIs small in practiceMaximum actual exhaust superheat SHIs actually bigAnd the target degree of superheat SH of exhaust gasTargetOptimizing the initial opening degree BFirst stageThe method comprises the following steps:
in calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetAt > 2, according to BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage；
In calculating (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen < -2 > is in accordance with BFirst stage*(SHIs actually big+SHIs small in practice)/2/SHTargetCalculating the optimized initial opening degree BFirst stage；
After calculating | (SH)Is actually big+SHIs small in practice)/2-SHTargetWhen | < 2, the initial opening degree BFirst stageAnd is not changed.
9. The control method of an electronic expansion valve according to claim 5, wherein the electronic expansion valve is controlled to have an initial opening degree BFirst stageThe control method of the electronic expansion valve further includes, before operating for the predetermined time, the steps of:
obtaining the indoor ambient temperature T in the operating environment of the heat pump systemInner partAnd outdoor ambient temperature TOuter coverAnd according to the indoor ambient temperature TInner partAnd the outdoor ambient temperature TOuter coverCalculating the initial opening degree BFirst stage。
10. The control method of an electronic expansion valve according to claim 9, characterized in that it is controlled according to the indoor ambient temperature TInner partAnd the outdoor ambient temperature TOuter coverCalculating the initial opening degree BFirst stageThe method comprises the following steps:
according to the indoor ambient temperature TInner partAnd the outdoor ambient temperature TOuter coverCalculating the initial opening B by an operation formulaFirst stage(ii) a Wherein, the operation formula is as follows: b isFirst stage＝150+(TInner part+TOuter cover)*5。
11. Control method of an electronic expansion valve according to any of claims 1 to 4, characterized in that the current opening degree B of the electronic expansion valve is calculated once per adjustment period Δ T of the electronic expansion valvekThe method comprises the following steps:
calculating the current opening degree B of the electronic expansion valve once in each adjusting period delta T according to the operation criterion of the electronic expansion valvek(ii) a The operation criterion is as follows:
Bk＝Bk-1+ΔBk；
when SH is presentDeviation ofWhen > 5,. DELTA.Bk＝10；
When-5 is less than or equal to SHDeviation ofWhen the value is less than or equal to 5, delta Bk＝0；
When SH is presentDeviation ofWhen less than-5, delta Bk＝-10；
Wherein, Bk-1Opening degree of the electronic expansion valve for the previous adjustment period delta T, and exhaust superheat deviation value SHDeviation ofFor the actual degree of superheat SH of the exhaust gasPractice ofWith the target degree of superheat SH of exhaust gasTargetThe difference between them.
12. A heat pump system adapted for use in the control method of the electronic expansion valve according to any one of claims 1 to 11, the heat pump system comprising:
the compressor comprises a compressor (1), wherein an exhaust pipe is arranged at an exhaust port of the compressor (1);
an electronic expansion valve (4);
an exhaust temperature detecting member (7) provided on the exhaust pipe to detect an exhaust temperature of the compressor (1);
a pressure detecting member (6) provided on the discharge pipe to detect a discharge pressure of the compressor (1).
13. The heat pump system of claim 12, further comprising:
an indoor ambient temperature detection unit (9) provided on an indoor side of the heat pump system to detect an indoor ambient temperature in an operating environment of the heat pump system;
and the outdoor environment temperature detection piece (8) is arranged on the outdoor side of the heat pump system so as to detect the outdoor environment temperature in the operating environment of the heat pump system.
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