CN117469853A

CN117469853A - Electronic expansion valve adjusting method and device, air source heat pump and storage medium

Info

Publication number: CN117469853A
Application number: CN202311650900.6A
Authority: CN
Inventors: 杜泽锋; 梁勇超; 请求不公布姓名; 邵禹琦
Original assignee: Guangdong TCL Intelligent HVAC Equipment Co Ltd
Current assignee: Guangdong TCL Intelligent HVAC Equipment Co Ltd
Priority date: 2023-12-04
Filing date: 2023-12-04
Publication date: 2024-01-30

Abstract

The invention discloses an electronic expansion valve adjusting method, an electronic expansion valve adjusting device, an air source heat pump and a storage medium, wherein the method is applied to the air source heat pump, the air source heat pump comprises a compressor, a water side heat exchanger and an electronic expansion valve, and the method comprises the following steps: acquiring the exhaust superheat degree and the return superheat degree of the compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger; if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the coolant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump; and adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal. The invention can ensure that the air source heat pump can reliably and efficiently operate.

Description

Electronic expansion valve adjusting method and device, air source heat pump and storage medium

Technical Field

The invention relates to the technical field of air source heat pumps, in particular to an electronic expansion valve adjusting method and device, an air source heat pump and a storage medium.

Background

The air source heat pump product uses the frequency conversion compressor, the electronic expansion valve, the water side heat exchanger and other structures to operate in a combined way, so that the temperature adjusting effect is realized.

In the related art, the air source heat pump product mainly adjusts the opening degree of the electronic expansion valve according to the degree of superheat of the exhaust gas when the compressor is operated, so as to maintain the reliability of the air source heat pump. However, in actual operation, it is found that the efficiency of the air source heat pump may be lowered after the exhaust superheat degree is adjusted to a normal state, so that the air source heat pump cannot be operated reliably and efficiently.

Disclosure of Invention

The embodiment of the invention provides an electronic expansion valve adjusting method, an electronic expansion valve adjusting device, an air source heat pump and a storage medium, and aims to enable the air source heat pump to run reliably and efficiently.

In a first aspect, an embodiment of the present invention provides an electronic expansion valve adjustment method applied to an air source heat pump, where the air source heat pump includes a compressor, a water side heat exchanger, and an electronic expansion valve, the method includes:

acquiring the exhaust superheat degree and the return superheat degree of the compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger;

if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the coolant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump;

And adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal.

Optionally, before determining the adjustment sequence of each abnormal operation parameter according to the influence factor of each abnormal operation parameter on the air source heat pump, the method includes:

acquiring reliability influence scores and efficiency influence scores corresponding to the abnormal operation parameters;

and weighting the reliability influence score and the efficiency influence score according to a preset weight to obtain the influence factor.

Optionally, the obtaining the exhaust superheat degree and the return superheat degree of the air source heat pump and the refrigerant water flow temperature difference between the refrigerant and the water flow in the water side heat exchanger includes:

if the air source heat pump is in a refrigeration mode, acquiring a refrigerant air pipe temperature of the air source heat pump and a water outlet temperature of the water side heat exchanger, and determining the refrigerant water flow temperature difference according to the refrigerant air pipe temperature and the water outlet temperature;

if the air source heat pump is in a heating mode, acquiring the temperature of a refrigerant liquid pipe of the air source heat pump and the water inlet temperature of the water side heat exchanger, and determining the temperature difference of the refrigerant water flow according to the temperature of the refrigerant liquid pipe and the water inlet temperature.

Optionally, before the obtaining the exhaust superheat degree and the return superheat degree of the air source heat pump and the refrigerant water flow temperature difference between the refrigerant and the water flow in the water side heat exchanger, the method further includes:

receiving a starting instruction of the air source heat pump;

acquiring the running environment parameters of the air source heat pump and the setting parameters corresponding to the starting instructions;

determining the initial opening of the electronic expansion valve and the corresponding operation time length according to the operation environment parameters, the setting parameters and a preset standard operation comparison table;

and controlling the electronic expansion valve to operate according to the initial opening, and executing to acquire the exhaust superheat degree and the return superheat degree of the air source heat pump and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger when the operation reaches the operation time.

Optionally, before determining the adjustment sequence of each abnormal operation parameter according to the influence factor of each abnormal operation parameter on the air source heat pump, the method further includes:

determining an abnormal trend of the abnormal operation parameters according to a comparison result between each abnormal operation parameter and a corresponding preset operation range;

when the abnormal trends are consistent, determining target change opening degrees of the electronic expansion valves corresponding to the abnormal operation parameters according to the difference values between the abnormal operation parameters and the preset operation range, and adjusting the opening degrees of the electronic expansion valves according to the maximum target change opening degrees;

And when the abnormal trends are inconsistent, executing the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump.

And adjusting the opening of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters, wherein the method comprises the following steps:

obtaining target abnormal operation parameters to be adjusted according to the abnormal operation parameters and the adjustment sequence of the abnormal operation parameters;

acquiring a difference value between the target abnormal operation parameter and a preset operation range corresponding to the target abnormal operation parameter;

and determining a target opening of the electronic expansion valve according to the difference value and a preset proportional coefficient, and adjusting the opening of the electronic expansion valve to the target opening.

Optionally, the adjusting the opening of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter returns to normal includes:

If the target abnormal operation parameters are lower than the corresponding preset operation ranges, the opening of the electronic expansion valve is adjusted and reduced;

and if the target abnormal operation parameter is higher than the corresponding preset operation range, the opening of the electronic expansion valve is adjusted and increased.

In a second aspect, an embodiment of the present invention provides an electronic expansion valve adjusting apparatus, including:

the acquisition module is used for acquiring the exhaust superheat degree and the return superheat degree of the compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger;

the determining module is used for determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the refrigerant water flow temperature difference;

the control module is used for adjusting the opening degree of the electronic expansion valve according to the abnormal operation parameters and the adjustment sequence of the abnormal operation parameters until the abnormal operation parameters are recovered to be normal.

In a third aspect, an embodiment of the present invention further provides an air source heat pump, including a memory storing a plurality of instructions; the processor loads instructions from the memory to execute any of the steps of the electronic expansion valve adjustment methods provided by the embodiments of the present invention.

In a fourth aspect, embodiments of the present invention further provide a computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform any of the steps of the electronic expansion valve adjustment method provided by the embodiments of the present invention.

Firstly, obtaining the exhaust superheat degree and the return superheat degree of a compressor of an air source heat pump and the temperature difference of a refrigerant water flow between a refrigerant and the water flow in a water side heat exchanger; if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the coolant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump; and adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal. When the operation of the air source heat pump is abnormal, the reliability and stability of the air source heat pump can be respectively affected to different degrees, the electronic expansion valve can be further regulated according to the operation parameters with higher influence on the reliability on the influence factors of the reliability on the basis of the influence factors of the reliability on the reliability, the electronic expansion valve can be further controlled according to the abnormal operation parameters on the basis of the operation parameters with higher influence on the reliability within a normal range, so that the regulation sequence among the abnormal operation parameters can be determined, the opening degree of the electronic expansion valve can be controlled one by one according to the abnormal operation parameters one by one, and the regulation sequence of the abnormal operation parameters until the abnormal operation parameters are recovered to normal.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of one embodiment of an electronic expansion valve regulating method provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of an air source heat pump in an embodiment of the invention;

FIG. 3 is a schematic flow chart of another embodiment of an electronic expansion valve regulating method provided in an embodiment of the present invention;

FIG. 4 is a schematic flow chart of yet another embodiment of an electronic expansion valve adjustment method provided in an embodiment of the present invention;

FIG. 5 is a schematic view of an electronic expansion valve adjusting apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an air source heat pump provided in an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Meanwhile, in the description of the embodiments of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

The embodiment of the invention provides an electronic expansion valve adjusting method, an electronic expansion valve adjusting device, an air source heat pump and a computer readable storage medium.

Specifically, the present embodiment will be described from the perspective of an electronic expansion valve adjusting apparatus that may be integrated in an air source heat pump, that is, the electronic expansion valve adjusting method of the embodiment of the present invention may be executed by the air source heat pump, or alternatively, may be executed by a device having a drying function such as a washing machine.

The following describes the embodiments in detail with reference to the accompanying drawings, in which the execution subject is an air source heat pump. The following description of the embodiments is not intended to limit the preferred embodiments. Although a logical order is depicted in the flowchart, in some cases the steps shown or described may be performed in an order different than depicted in the figures.

According to the background technical description of the invention, the electronic expansion valve in the related art has rough regulation process, and the reliability of the air source heat pump is only considered, so that the reliable and efficient operation of the air source heat pump cannot be ensured.

In order to solve the above problems, the present invention discloses an electronic expansion valve adjusting method, please refer to fig. 1, which includes the following steps S10 to S30, wherein:

Step S10, obtaining the exhaust superheat degree and the return superheat degree of a compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger;

in this embodiment, the electronic expansion valve adjustment method may be applied to an air source heat pump. The air source heat pump comprises a compressor, a wind side heat exchanger, an electronic expansion valve and the like. The electronic expansion valve is arranged on a refrigerant liquid pipe of the air source heat pump, and the air source heat pump can be further provided with an electronic expansion valve adjusting device, so that the opening degree of electronic expansion can be controlled according to some setting algorithms. The two ends of the electronic expansion valve are also provided with filters which can be used for filtering out impurities in the refrigerant flowing through the electronic expansion valve, preventing the impurities from accumulating at the electronic expansion valve, ensuring the normal operation of the electronic expansion valve and controlling the accuracy of the opening degree of the electronic expansion valve.

The water side heat exchanger in the air source heat pump can further comprise a water flow pipeline and a refrigerant pipeline adjacent to the water flow pipeline, one end of the refrigerant pipeline in the water side heat exchanger is communicated with the refrigerant liquid pipe in the air source heat pump, the other end of the refrigerant pipeline in the water side heat exchanger is communicated with the refrigerant gas pipe in the air source heat pump, water flows through the inside of the water side heat exchanger from the water inlet of the water side heat exchanger, flows out from the water outlet of the water side heat exchanger, and exchanges heat with the refrigerant in the adjacent refrigerant pipeline in the process of flowing through the water side heat exchanger, so that the refrigerant is converted into a liquid state from a gaseous state.

The wind side heat exchanger and the water side heat exchanger can be respectively used as a condenser and an evaporator of the air source heat pump in different modes. The compressor compresses low-temperature low-pressure refrigerant gas into high-temperature high-pressure gas, the gas is exhausted to the condenser for condensation, and the exhaust superheat degree of the air source heat pump required to be obtained is the difference between the exhaust temperature of the compressor in the air source heat pump and the condensation temperature of the refrigerant after condensation in the system of the air source heat pump; the condenser is used for converting the high-temperature and high-pressure refrigerant into low-temperature and high-pressure liquid after releasing heat, the liquid is decompressed into low-temperature and low-pressure liquid through the electronic expansion valve, the liquid is absorbed by the evaporator into low-temperature and low-pressure gas, the gas is returned to the compressor, and the required air return superheat degree of the air source heat pump is the difference between the air return temperature of the compressor in the air source heat pump and the condensing temperature of the evaporated refrigerant in the system of the air source heat pump; the water side heat exchanger has heat exchange between the refrigerant and the water flow, and the temperature difference of the refrigerant and the water flow is the temperature difference of the refrigerant and the water flow in the water side heat exchanger.

In this embodiment, the air source heat pump may have a heating mode and a cooling mode, referring to fig. 2, in which a four-way valve is provided in fig. 2, and the four-way valve is adjusted to adjust the operation mode of the air source heat pump, in the cooling mode, the four-way valve is in a first opening state, the air side heat exchanger is used as a condenser, the water side heat exchanger is used as an evaporator, high-temperature and high-pressure gas discharged by the compressor enters the air side heat exchanger to be condensed into low-temperature and high-pressure liquid, and the liquid input to the water side heat exchanger is the low-temperature and low-pressure liquid to absorb heat to the water flow in the air side heat exchanger. In the refrigeration mode, the difference between the temperature of the refrigerant gas pipe and the water side heat exchanger can be more obviously reflected by taking the temperature difference between the temperature of the refrigerant gas pipe of the air source heat pump and the water outlet temperature of the water side heat exchanger as the temperature difference of the refrigerant water. And in the refrigeration mode, detecting the exhaust temperature of the compressor and the outlet temperature of the air-side heat exchanger, determining the exhaust superheat degree of the compressor according to the difference between the exhaust temperature and the outlet temperature, detecting the return air temperature of the compressor and the system pressure of the air source heat pump, and determining the return air superheat degree of the compressor according to the difference between the return air temperature and the saturation temperature corresponding to the system pressure.

In the heating mode, the four-way valve is in the second opening state, high-temperature and high-pressure gas discharged by the compressor enters the water side heat exchanger to be condensed into low-temperature and high-pressure liquid, the liquid is absorbed by water flow in the water side heat exchanger, and the difference between the temperature of a refrigerant liquid pipe of the air source heat pump and the water inlet temperature of the water side heat exchanger can be more obviously reflected as the temperature difference of the refrigerant water. And in the heating mode, detecting the exhaust temperature of the compressor and the system pressure of the air source heat pump, determining the exhaust superheat degree of the compressor according to the difference between the exhaust temperature and the saturation temperature corresponding to the system pressure, detecting the return air temperature of the compressor, determining the return air superheat degree of the compressor according to the outlet temperature of the wind side heat exchanger and the difference between the return air temperature and the outlet temperature.

The temperature difference of the refrigerant water flow is calculated in a split operation mode, so that the temperature difference of the refrigerant water flow in the water side heat exchanger can be obtained, the opening of the electronic expansion valve can be accurately adjusted, and the efficiency of the air source heat pump is improved.

Step S20, if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the refrigerant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump;

In this embodiment, whether three operation parameters, namely, the exhaust superheat degree, the return superheat degree and the coolant flow temperature difference are abnormal or not is detected, the exhaust superheat degree, the return superheat degree and the coolant flow temperature difference can be compared with corresponding preset operation ranges, and if the operation parameters are not in the corresponding preset operation ranges, the operation parameters are determined to be abnormal operation parameters. If an abnormal operation parameter exists in the exhaust superheat degree, the return superheat degree and the temperature difference of the coolant water flow, controlling the opening of the electronic expansion valve according to the abnormal operation parameter. If at least two abnormal operation parameters exist in the exhaust superheat degree, the return superheat degree and the refrigerant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of the abnormal operation parameters corresponding to the air source heat pump. The influence factors refer to influence factors of the comprehensive operation effect of the air source heat pump, the comprehensive operation effect is influenced by reliability and high efficiency, and the exhaust superheat degree, the return superheat degree and the coolant water flow temperature have different degrees of influence on the reliability and the high efficiency, so that the influence on the comprehensive operation effect is different, the larger the influence factors are, the more the comprehensive operation effect is promoted, the higher the priority of adjustment is, and the sequencing is the earlier in the adjustment sequence.

Optionally, obtaining a reliability influence score and a performance influence score of the abnormal operation parameter, and weighting the reliability influence score and the performance influence score according to a preset weight to obtain the influence factor. The preset weight corresponding to the reliability impact score may be greater than the preset weight corresponding to the efficacy impact score, so that the adjustment sequence may be determined according to the impact of the abnormal operation parameters on the reliability and efficiency of the air source heat pump.

Optionally, before step S20, the method further includes:

acquiring a relative abnormal value, a reliability influence score and a performance influence score between the abnormal operation parameters and a corresponding preset operation range;

and weighting the relative abnormal value, the reliability influence score and the efficiency influence score according to a preset weight to obtain the influence factor.

In this embodiment, the influence factor may represent the influence degree of the integrated operation effect of the air source heat pump, where reliability and efficiency may affect the integrated operation effect, and besides, the relative abnormal value of the abnormal operation parameter and the preset operation range may also affect the integrated operation effect, where the relative abnormal value is used to represent the acceptable degree of the difference between the abnormal operation parameter and the corresponding preset operation range, and the calculation is performed by the following formula:

Relative outlier = maximum threshold max-minimum threshold min of the difference L/preset operating range between the abnormal operating parameter and its corresponding preset operating range.

When the abnormal operation parameter is smaller than the minimum threshold value, L=the minimum threshold value min-the abnormal operation parameter, and when the abnormal operation parameter is larger than the maximum threshold value, L=the abnormal operation parameter-the maximum threshold value max. The more difficult the difference value L is ignored when the relative abnormal value is larger, the smaller the acceptable degree is, and the larger the influence of the difference value L on the comprehensive operation effect is, whereas the more easily the difference value L is ignored when the relative abnormal value is smaller, the larger the acceptable degree is, and the smaller the influence of the difference value L on the comprehensive operation effect is. This relative anomaly is a parameter that needs to be determined in real time during operation of the air source heat pump.

The impact factor may thus be determined from the relative outliers of the outlier operating parameter and the preset operating range, its reliability impact score and efficacy impact score for the air source heat pump. The reliability impact score and the efficiency impact score can respectively represent the influence of the characterization abnormal operation parameters on the reliability and the high efficiency of the air source heat pump, and the reliability impact score and the efficiency impact score when the exhaust superheat degree, the return superheat degree and the temperature difference of the refrigerant water flow are abnormal can be determined through some operation experience, theoretical deduction or historical operation parameters of the air source heat pump.

Specifically, when the refrigerant is phase-changed to evaporate or condense in the water side heat exchanger, the heat absorption or heat release amount is the largest, and the heat exchange amount of the overheat (higher than the evaporating or condensing temperature) or the supercooling (lower than the evaporating or condensing temperature) is small, so that the heat exchange process of the refrigerant and the water flow is controlled to be just the evaporating or condensing process of the refrigerant, the overheat or supercooling is reduced as much as possible, and the temperature of the water is basically equal to the evaporating or condensing temperature of the refrigerant. Therefore, the temperature of the refrigerant is controlled to be near the water temperature, and the refrigerant cannot be too low or too high, or the heat exchange is incomplete, and the efficiency of the air source heat pump is low, so that the efficiency influence score is larger than the efficiency influence scores of the superheat degree of the exhaust gas and the superheat degree of the return gas. When the superheat degree of the return air is abnormal, the efficiency of the air source heat exchange pump can be influenced to a certain extent, so that the efficiency influence score of the superheat degree of the return air is larger than the efficiency influence score of the superheat degree of the exhaust air.

The reliability influence score can be determined according to specific experimental data or historical operation parameters, when the abnormal operation parameters are determined to be abnormal independently according to the experimental data or the historical operation parameters, the oil return condition and the liquid return condition of the air source heat pump are caused to damage the air source heat pump, and the reliability influence score corresponding to each abnormal operation parameter is determined according to the damage condition of each abnormal operation parameter to the air source heat pump. The reliability influence score corresponding to the abnormal operation parameters can be determined according to inference, and the reliability influence score of the exhaust superheat degree is larger than the reliability influence score of the return superheat degree, which is larger than the reliability influence score of the condensate water temperature difference, according to common theory.

After the reliability influence score is determined, preset weights of the reliability influence score, the efficiency influence score and the relative abnormal value are obtained in advance, the reliability influence score, the efficiency influence score and the relative abnormal value corresponding to each operation parameter are weighted according to the preset weights, the weighted result is used as an influence factor of the abnormal operation parameter, and then the adjustment sequence of each abnormal operation parameter is obtained by sequencing from large to small according to the influence factor.

In some embodiments, the influence of reliability on the air source heat pump is prioritized, and the preset weight corresponding to the reliability influence score is set to be greater than the preset weight corresponding to the performance influence score. When the reliability influence score E is that the degree of exhaust superheat is E, the degree of return air is E, the temperature difference of condensate water is E, and the efficiency influence score F is that the degree of exhaust superheat is F, the degree of return air is F, the temperature difference of condensate water is F, under the condition that the relative abnormal value is not great, the influence factor of the degree of exhaust superheat is larger than the influence factor of the degree of return air, the influence factor of the degree of return air is larger than the influence factor of the temperature difference of coolant water flow, and the adjustment sequence of the three is that the degree of exhaust superheat is higher than the degree of return air, and the degree of return air is higher than the temperature difference of coolant water flow. Therefore, on the premise of ensuring reliability, the high efficiency of the air source heat pump can be further improved.

And step S30, adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal.

In this embodiment, after the adjustment sequence of each abnormal operation parameter is determined, the abnormal operation parameters are taken as target abnormal operation parameters one by one based on the adjustment sequence, and the attitude of the electronic expansion valve is adjusted according to the target abnormal operation parameters, so as to adjust the system pressure, that is, adjust the transmission rate of the refrigerant in the air source heat pump, thereby adjusting the operation effect of the air source heat pump. And in the adjusting process, if the target abnormal operation parameters are recovered to be normal, determining the next target abnormal operation parameters according to the adjusting sequence, and adjusting the air source heat pump again. If the abnormal operation parameters are recovered to be normal in the adjusting process, the adjusting can be stopped even if the adjusting sequence is not completed, and if the new abnormal operation parameters appear in the adjusting process, the adjusting sequence of the abnormal operation parameters is determined again according to the influence factors of the abnormal operation parameters on the air source heat pump until the abnormal operation parameters are recovered to be normal.

In the technical scheme disclosed in the embodiment, the exhaust superheat degree and the return superheat degree of the compressor of the air source heat pump and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger are obtained; if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the coolant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump; and adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal. When the operation of the air source heat pump is abnormal, the reliability and stability of the air source heat pump can be respectively affected to different degrees, the electronic expansion valve can be further regulated according to the operation parameters with higher influence on the reliability on the influence factors of the reliability on the basis of the influence factors of the reliability on the reliability, the electronic expansion valve can be further controlled according to the abnormal operation parameters on the basis of the operation parameters with higher influence on the reliability within a normal range, so that the regulation sequence among the abnormal operation parameters can be determined, the opening degree of the electronic expansion valve can be controlled one by one according to the abnormal operation parameters one by one, and the regulation sequence of the abnormal operation parameters until the abnormal operation parameters are recovered to normal.

Further, step S30 includes:

In this embodiment, according to the adjustment sequence of each abnormal operation parameter, the target abnormal operation parameter to be adjusted is obtained, and the opening of the electronic expansion valve is currently required to be controlled according to the target abnormal operation parameter. And acquiring a preset operation range corresponding to the target abnormal operation parameter, and determining a difference value between the target abnormal operation parameter and the corresponding preset operation range, wherein the absolute value of the difference value is a unit distance between the target abnormal operation parameter and the corresponding preset operation range on the numerical axis representation. When the target abnormal operation parameter is smaller than or corresponds to the minimum threshold value of the preset operation range, the difference value=the target abnormal operation parameter-the minimum threshold value, and when the target abnormal operation parameter is larger than or equal to the maximum threshold value of the corresponding preset operation range, the difference value=the target abnormal operation parameter-the maximum threshold value. And determining the target change opening of the electronic expansion valve according to the difference value and the preset proportional coefficient, wherein the target change opening=the difference value is the preset proportional coefficient, the preset proportional coefficient is a positive value, and when the preset proportional coefficient is equal to 1, a better effect can be achieved.

Illustratively, if the target abnormal operating parameter is the degree of exhaust superheat:

if TDH (exhaust superheat degree) is less than TDHlow (minimum threshold value of exhaust superheat degree normal operation range), the target variable opening degree of the electronic expansion valve is (TDH-TDHlow), and the target opening degree of the electronic expansion valve is the current opening degree+ (TDH-TDHlow);

if TDHlow is less than or equal to TDH and less than TDHhigh (the maximum threshold value of the normal operation range of the exhaust superheat degree), determining the next abnormal operation parameter corresponding to the exhaust superheat degree as the target abnormal operation parameter according to the adjustment sequence;

if TDHhigh is less than or equal to TDH, the target opening degree of the electronic expansion valve is the current opening degree+ (TDH-TDHlow).

Thus, the target opening of the electronic expansion valve is determined according to the difference value between the target abnormal operation parameter and the preset operation range corresponding to the target abnormal operation parameter and the preset proportionality coefficient, and the electronic expansion valve can be regulated more accurately, so that the reliability and the high efficiency of the air source heat pump are further improved, and the operation effect is improved.

Further, step S30 includes:

In this embodiment, according to the adjustment sequence of each abnormal operation parameter, the target abnormal operation parameter to be adjusted is obtained, and the opening of the electronic expansion valve is currently required to be controlled according to the target abnormal operation parameter. In order to improve the control efficiency, the opening of the electronic expansion valve can be directly adjusted according to the target abnormal parameter, namely, the opening of the electronic expansion valve is determined to be reduced or increased according to the comparison result of the abnormal operation parameter corresponding to the preset operation range. And if the target abnormal operation parameter is not in the corresponding preset operation range, the electronic expansion valve is subjected to unit opening adjustment, and if the target abnormal operation parameter is not in the corresponding preset operation range, the electronic expansion valve is subjected to unit opening adjustment again until the target abnormal operation parameter is in normal operation, so that the micro-adjustment of the opening is realized, the logic design is simple, and the control efficiency can be improved.

Specifically, when the target abnormal operation parameter is the exhaust superheat degree, if the exhaust superheat degree is lower than the minimum threshold value of the corresponding preset operation range, the electronic expansion valve is subjected to opening adjustment and shrinkage, and if the exhaust superheat degree is higher than the minimum threshold value of the corresponding preset operation range, the electronic expansion valve is subjected to opening adjustment and shrinkage; when the target abnormal operation parameter is the air return superheat degree, if the air return superheat degree is lower than the minimum threshold value of the corresponding preset operation range, the opening degree of the electronic expansion valve is adjusted and reduced, and if the air return superheat degree is higher than the minimum threshold value of the corresponding preset operation range, the opening degree of the electronic expansion valve is adjusted and reduced; and when the target abnormal operation parameter is the temperature difference of the coolant water, if the temperature difference of the coolant water is lower than the minimum threshold value of the corresponding preset operation range, the electronic expansion valve is subjected to opening adjustment and shrinkage, and if the temperature difference of the coolant water is higher than the minimum threshold value of the corresponding preset operation range, the electronic expansion valve is subjected to opening adjustment and shrinkage.

The opening degree of the electronic expansion valve is increased or reduced according to the comparison result of the target abnormal operation parameter and the preset operation range, so that the control efficiency can be improved on one hand, on the other hand, the target abnormal operation parameter can be gradually adjusted to be in the corresponding preset operation range through fine adjustment of the opening degree of the electronic expansion valve, the overshoot phenomenon is reduced, other influences are caused on the air source heat pump, and the reliability and the high efficiency of the air source heat pump are further improved.

Optionally, referring to fig. 3, in another embodiment of the electronic expansion valve adjusting method according to the present invention, before the step 10, the method further includes:

s40, receiving a starting instruction of the air source heat pump;

in this embodiment, the air source heat pump may receive a start command triggered by a user, and after receiving the start command, the mode in which the air source heat pump needs to operate and some setting parameters in the required operation mode, for example, setting parameters for the water temperature at the water outlet of the water side heat exchanger, may be determined according to the start command.

S50, acquiring the operation environment parameters of the air source heat pump and the setting parameters corresponding to the starting instruction;

in this embodiment, in the initial operation process of the air source heat pump, an operation environment parameter, such as an ambient temperature and humidity of the air side heat exchanger, a water temperature of the water inlet of the water side heat exchanger, etc., needs to be obtained, and may be determined according to the operation environment parameter of the air source heat pump and a set parameter corresponding to the start command, and in the operation environment parameter, the relevant parameter of the air source heat pump is adjusted to the set parameter, so that the working condition of the air source heat pump is required.

S60, determining the initial opening of the electronic expansion valve and the corresponding operation time according to the operation environment parameters, the setting parameters and a preset standard operation comparison table;

in this embodiment, the air source heat pump is provided with a standard working comparison table, which includes preset operation environment parameters, preset setting parameters, preset opening of the electronic expansion valve and corresponding operation time. And then the opening of the electronic expansion valve corresponding to the current operation environment parameter and the current setting parameter and the corresponding operation time length thereof can be inquired based on the standard operation comparison table, and the opening is used as the initial opening of the electronic expansion valve. It should be noted that under different working conditions, the initial opening degree and the corresponding operation duration of the electronic expansion valve are different, and when the air source heat pump is initially operated, the electronic expansion valve operates according to a standard operation comparison table, so that the electronic expansion valve can reliably and efficiently operate within a certain time.

And S70, controlling the electronic expansion valve to operate according to the initial opening, and executing to acquire the exhaust superheat degree and the return superheat degree of the air source heat pump and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger when the operation reaches the operation time.

In this embodiment, after the air source heat pump is started, after the initial opening of the electronic expansion valve is determined, the electronic expansion valve is controlled to be opened at the initial opening for a certain period of time, and when the electronic expansion valve is opened at the initial opening and the operation reaches the operation duration, step S10 is executed.

In the technical scheme disclosed in the embodiment, after receiving the starting instruction, the electronic expansion valve is adjusted according to the running environment and the initial opening corresponding to the starting instruction, and after running for a period of time, the exhaust superheat degree, the return superheat degree and the temperature difference of the refrigerant water flow are detected abnormally, so that the air source heat pump can continue to run reliably and efficiently.

Optionally, referring to fig. 4, in a further embodiment of the electronic expansion valve adjusting method according to the present invention, before the step 20, the method further includes:

step S80, determining an abnormal trend of the abnormal operation parameters according to a comparison result between each abnormal operation parameter and the corresponding preset operation range;

in this embodiment, whether the exhaust superheat degree, the return superheat degree and the refrigerant water flow temperature difference are abnormal operation parameters is determined according to whether the exhaust superheat degree, the return superheat degree and the refrigerant water flow temperature difference are within the corresponding preset operation ranges, if so, the abnormal operation parameters are not generated, and the irregular operation parameters are generated. Further determining the number of the abnormal operation parameters, if at least two abnormal operation parameters exist in the exhaust superheat degree, the return superheat degree and the refrigerant water flow temperature difference, determining the abnormal trend of the abnormal operation parameters according to the comparison result between the abnormal operation parameters and the corresponding preset operation range, if the abnormal operation parameters are lower than the minimum threshold value of the preset operation range, considering the abnormal trend to be reduced, and if the abnormal operation parameters are higher than the maximum threshold value of the preset operation range, considering the abnormal trend to be increased.

Step S90, when the abnormal trends are consistent, determining a target change opening degree of the electronic expansion valve corresponding to each abnormal operation parameter according to a difference value between each abnormal operation parameter and the preset operation range, and adjusting the opening degree of the electronic expansion valve according to the maximum target change opening degree;

in the present embodiment, the abnormal tendency of the abnormal operation parameter is either an increase or a decrease. When the abnormal trend of each abnormal operation parameter is raised or lowered, the abnormal trend is considered to be consistent. With reference to the above, regarding the exhaust superheat degree, the return superheat degree and the refrigerant water flow temperature difference, the adjustment control of the increase in the opening degree of the electronic expansion valve is reduced according to the comparison result between the abnormal operation parameters and the corresponding preset operation ranges, and has certain consistency, and when the abnormal trends are consistent, the adjustment trends of the opening degree of the electronic expansion valve according to the respective abnormal operation parameters are consistent, and are both increased or reduced. Thus, the electronic expansion valve opening degree is regulated to have a tendency of regulating the abnormal operation parameters to be within the preset operation range. Determining target change opening of the electronic expansion valve corresponding to each abnormal operation parameter according to the difference value between different abnormal operation parameters and a preset operation range and a preset proportion coefficient, determining the target opening of the electronic expansion valve according to the maximum target change opening, the electronic expansion valve adjusting tendency determined by the abnormal trend and the current opening of the electronic expansion valve, and controlling the electronic expansion valve to adjust to the target opening.

Optionally, after a period of operation, step S10 is re-executed until all of the various operating parameters are restored to normal.

And step S100, when the abnormal trends are inconsistent, executing the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump.

In this embodiment, if the abnormal trends are inconsistent, the adjustment trends of the electronic expansion valve are inconsistent according to the abnormal operation parameters, the adjustment sequence of the abnormal operation parameters is determined according to the influence factors of the abnormal operation parameters on the air source heat pump, and then the opening of the electronic expansion valve is controlled according to the adjustment sequence of the abnormal operation parameters until the abnormal operation parameters are recovered to be normal.

In the technical scheme disclosed in the embodiment, if a plurality of abnormal operation parameters exist, consistency of abnormal trends of the abnormal operation parameters is judged first, and when the abnormal trends are consistent, control logic with the largest adjustment change of the electronic expansion valve in the abnormal operation parameters can be adopted to control the opening degree of the electronic expansion valve, so that the efficiency of reliable and efficient operation of the air source heat pump is improved.

The embodiment also provides an electronic expansion valve adjusting device which can be integrated in an air source heat pump. For example, as shown in fig. 5, the electronic expansion valve adjusting apparatus may include:

The obtaining module 1001 is configured to obtain a degree of superheat of the exhaust gas and a degree of superheat of the return gas of the compressor, and a temperature difference of a coolant water flow between a coolant in the water side heat exchanger and the water flow;

a determining module 1002, configured to determine, if at least two abnormal operation parameters exist in the exhaust superheat degree, the return superheat degree, and the coolant flow temperature difference, an adjustment sequence of each abnormal operation parameter according to an influence factor of each abnormal operation parameter on the air source heat pump;

and the control module 1003 is configured to adjust the opening of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter returns to normal.

Optionally, the determining module 1002 is further configured to:

Optionally, the obtaining module 1001 is further configured to:

Optionally, the electronic expansion valve adjusting device may further include:

the pre-starting module is used for receiving a starting instruction of the air source heat pump;

and controlling the electronic expansion valve to operate according to the initial opening, and executing to acquire the exhaust superheat degree and the return superheat degree of the compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger when the operation time reaches the operation time.

the abnormal trend judging module is used for determining the abnormal trend of the abnormal operation parameters according to the comparison result between each abnormal operation parameter and the corresponding preset operation range;

Optionally, the control module 1003 is further configured to:

In this embodiment, firstly, the exhaust superheat degree and the return superheat degree of the compressor and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger are obtained; if at least two abnormal operation parameters exist in the exhaust superheat degree, the return air superheat degree and the coolant water flow temperature difference, determining the adjustment sequence of each abnormal operation parameter according to the influence factors of each abnormal operation parameter on the air source heat pump; and adjusting the opening degree of the electronic expansion valve according to each abnormal operation parameter and the adjustment sequence of the abnormal operation parameters until each abnormal operation parameter is recovered to be normal. When the operation of the air source heat pump is abnormal, the reliability and stability of the air source heat pump can be respectively affected to different degrees, the electronic expansion valve can be further regulated according to the operation parameters with higher influence on the reliability on the influence factors of the reliability on the basis of the influence factors of the reliability on the reliability, the electronic expansion valve can be further controlled according to the abnormal operation parameters on the basis of the operation parameters with higher influence on the reliability within a normal range, so that the regulation sequence among the abnormal operation parameters can be determined, the opening degree of the electronic expansion valve can be controlled one by one according to the abnormal operation parameters one by one, and the regulation sequence of the abnormal operation parameters until the abnormal operation parameters are recovered to normal.

As shown in fig. 6, fig. 6 is a schematic structural diagram of an air source heat pump according to an embodiment of the present invention. The air source heat pump 1100 includes a processor 1101 having one or more processing cores, a memory 1102 having one or more computer readable storage media, and a computer program stored on the memory 1102 and executable on the processor. The processor 1101 is electrically connected to the memory 1102. It will be appreciated by those skilled in the art that the air source heat pump structure shown in the figures is not limiting of the air source heat pump and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.

The processor 1101 is a control center of the air source heat pump 1100, connects the various parts of the overall air source heat pump 1100 using various interfaces and lines, and performs various functions and processes of the air source heat pump 1100 by running or loading software programs and/or units stored in the memory 1102, and invoking data stored in the memory 1102, thereby performing overall monitoring of the air source heat pump 1100. The processor 1101 may be a processor CPU, a graphics processor GPU, a network processor (Network Processor, NP), etc., that may implement or perform the methods, steps and logic blocks disclosed in embodiments of the present invention.

In the embodiment of the present invention, the processor 1101 in the air source heat pump 1100 loads instructions corresponding to the processes of one or more application programs into the memory 1102 according to the following steps, and the processor 1101 executes the application programs stored in the memory 1102, so as to implement various functions, for example:

acquiring the exhaust superheat degree and the return superheat degree of the air source heat pump and the temperature difference of the refrigerant water flow between the refrigerant and the water flow in the water side heat exchanger;

The specific implementation of each operation above may be referred to the previous embodiments, and will not be described herein.

Optionally, as shown in fig. 6, the air source heat pump 1100 further includes: a touch display 1103, a radio frequency circuit 1104, an audio circuit 1105, an input unit 1106, and a power supply 1107. The processor 1101 is electrically connected to the touch display 1103, the radio frequency circuit 1104, the audio circuit 1105, the input unit 1106, and the power supply 1107, respectively. It will be appreciated by those skilled in the art that the air source heat pump structure shown in fig. 6 is not limiting of the air source heat pump and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.

The touch display 1103 may be used to display a graphical user interface and receive an operation instruction generated by a user acting on the graphical user interface. The touch display 1103 may include a display panel and a touch panel. The display panel may be used to display information entered by a user or provided to a user, as well as various graphical user interfaces of the air source heat pump, which may be composed of graphics, text, icons, video, and any combination thereof. Alternatively, the display panel may be configured in the form of a liquid crystal display (LCD, liquid Crystal Display), an Organic Light-Emitting Diode (OLED), or the like. The touch panel may be used to collect touch operations on or near the user (such as operations on or near the touch panel by the user using any suitable object or accessory such as a finger, stylus, etc.), and generate corresponding operation instructions, and the operation instructions execute corresponding programs. Alternatively, the touch panel may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch azimuth of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, and sends the touch point coordinates to the processor 1101, and can receive and execute commands sent from the processor 1101. The touch panel may overlay the display panel, and upon detection of a touch operation thereon or thereabout, the touch panel is passed to the processor 1101 to determine the type of touch event, and the processor 1101 then provides a corresponding visual output on the display panel based on the type of touch event. In the embodiment of the present invention, the touch panel and the display panel may be integrated into the touch display 1103 to realize the input and output functions. In some embodiments, however, the touch panel and the touch panel may be implemented as two separate components to perform the input and output functions. I.e. the touch screen 1103 may also implement an input function as part of the input unit 1106.

The rf circuitry 1104 may be used to transceive rf signals to establish wireless communication with a network device or other air source heat pump via wireless communication.

The audio circuit 1105 may be used to provide an audio interface between the user and the air source heat pump through a speaker, microphone. The audio circuit 1105 may transmit the received electrical signal after audio data conversion to a speaker, where the electrical signal is converted into a sound signal for output; on the other hand, the microphone converts the collected sound signals into electrical signals, which are received by the audio circuit 1105 and converted into audio data, which are processed by the audio data output processor 1101, and sent to, for example, another air source heat pump via the radio frequency circuit 1104, or the audio data are output to the memory 1102 for further processing. The audio circuit 1105 may also include an ear bud jack to provide communication of the peripheral headphones with the air source heat pump.

The input unit 1106 may be used to receive input numbers, character information, or user characteristic information (e.g., fingerprint, iris, facial information, etc.), and to generate keyboard, mouse, joystick, optical, or trackball signal inputs related to user settings and function control.

A power supply 1107 is used to power the various components of the air source heat pump 1100. Alternatively, the power supply 1107 may be logically connected to the processor 1101 through a power management system, so as to perform functions of managing charging, discharging, and power consumption management through the power management system. The power supply 1107 may also include one or more of any of a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.

Although not shown in fig. 6, the air source heat pump 1100 may further include a camera, a sensor, a wireless fidelity module, a bluetooth module, etc., which will not be described herein.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the various methods of the above embodiments may be performed by instructions, or by instructions controlling associated hardware, which may be stored in a computer-readable storage medium and loaded and executed by a processor.

To this end, an embodiment of the present invention provides a computer readable storage medium having stored therein a plurality of computer programs that can be loaded by a processor to perform any of the electronic expansion valve adjustment methods provided by the embodiment of the present invention. The computer program may perform the steps of the electronic expansion valve adjustment method as follows:

Wherein the computer-readable storage medium may comprise: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.

Because the computer program stored in the computer readable storage medium can execute any electronic expansion valve adjusting method provided by the embodiment of the present invention, the beneficial effects that any electronic expansion valve adjusting method provided by the embodiment of the present invention can achieve can be achieved, which are detailed in the previous embodiments and are not described herein.

In the embodiments of the electronic expansion valve adjusting device, the computer readable storage medium, the air source heat pump and the computer program product, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and the beneficial effects of the electronic expansion valve adjusting device, the computer readable storage medium, the computer program product, the air source heat pump and the corresponding units described above may refer to the description of the electronic expansion valve adjusting method in the above embodiments, which is not repeated herein.

The foregoing has outlined some of the more detailed description of the electronic expansion valve regulating method, electronic expansion valve regulating device, air source heat pump, computer readable storage medium and computer program product according to the embodiments of the present invention, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, and the above examples are provided to assist in understanding the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.

Claims

1. An electronic expansion valve adjustment method, characterized by being applied to an air source heat pump including a compressor, a water side heat exchanger and an electronic expansion valve, the method comprising:

2. The electronic expansion valve adjusting method according to claim 1, wherein before determining the adjustment sequence of each abnormal operation parameter according to the influence factor of each abnormal operation parameter on the air source heat pump, comprising:

3. The method of claim 1, wherein said obtaining the exhaust superheat and the return superheat of the air source heat pump and the refrigerant water flow temperature difference between the refrigerant and the water flow in the water side heat exchanger comprises:

4. The method of claim 1, wherein before obtaining the superheat degree of the exhaust gas and the superheat degree of the return gas of the compressor and the temperature difference of the coolant water flow between the coolant and the water flow in the water side heat exchanger, further comprising:

Receiving a starting instruction of the air source heat pump;

5. The electronic expansion valve adjusting method according to claim 1, wherein before determining the adjustment sequence of each abnormal operation parameter according to the influence factor of each abnormal operation parameter on the air source heat pump, further comprising:

6. The electronic expansion valve adjusting method according to claim 1, wherein said adjusting the opening degree of the electronic expansion valve according to each of the abnormal operation parameters and the adjustment sequence of the abnormal operation parameters includes:

7. The electronic expansion valve adjusting method according to claim 1, wherein said adjusting the opening degree of the electronic expansion valve according to each of the abnormal operation parameters and the adjustment sequence of the abnormal operation parameters includes:

8. An electronic expansion valve regulating device, characterized in that the electronic expansion valve regulating device comprises:

9. An air source heat pump, comprising a processor and a memory, wherein the memory stores a plurality of instructions; the processor loads instructions from the memory to perform the steps of the electronic expansion valve adjustment method according to any of claims 1-7.

10. A computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of the electronic expansion valve adjustment method according to any of claims 1-7.