Expansion valve control method and device for air source heat pump and air source heat pump

Abstract

The invention relates to the technical field of air source heat pump control, and discloses an expansion valve control method and device for an air source heat pump and the air source heat pump, and the method comprises the steps that when it is determined that defrosting of an evaporator is finished, a first opening degree is determined according to the current outdoor environment temperature and the current water inlet temperature of the air source heat pump; the opening degree of the expansion valve is adjusted to be the first opening degree; within the first duration after defrosting of the evaporator is finished, the low pressure and the suction superheat degree of the air source heat pump are detected, and an opening compensation value is determined according to the detection result of the low pressure and the suction superheat degree; and the opening degree of the expansion valve is adjusted to be the second opening degree according to the opening degree compensation value. According to the method, the system of the air source heat pump can accurately enter the stable state, and frequent fluctuation of the opening degree of the expansion valve can be avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air source heat pump control, for example, to an expansion valve control method and device for an air source heat pump, and an air source heat pump. Background Art

[0002] When the air source heat pump operates in the heating season, the evaporator will inevitably frost, so it is necessary to defrost the evaporator in time. However, after defrosting the evaporator, the system state of the air source heat pump will become relatively chaotic. At this time, accurately assigning the opening degree of the expansion valve is an effective means to stabilize the system.

[0003] However, in the related art, it is difficult to accurately determine the opening degree of the expansion valve suitable for the current system state after defrosting the air source heat pump, which causes the system to fail to enter a stable state within a short time after defrosting the air source heat pump.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments, but rather serves as a preamble to the following detailed description.

[0006] The embodiments of the present disclosure provide an expansion valve control method and device for an air source heat pump, and an air source heat pump, which can enable the system of the air source heat pump to accurately enter a stable state.

[0007] According to a first aspect of the present disclosure, there is provided an expansion valve control method for an air source heat pump, including:

[0008] When it is determined that the defrosting of the evaporator ends, a first opening degree is determined according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump;

[0009] The opening degree of the expansion valve is adjusted to the first opening degree;

[0010] Within a first period of time after the defrosting of the evaporator ends, the low-pressure pressure and the suction superheat degree of the air source heat pump are detected, and an opening degree compensation value is determined according to the detection results of the low-pressure pressure and the suction superheat degree;

[0011] The opening degree of the expansion valve is adjusted to a second opening degree according to the opening degree compensation value.

[0012] In some embodiments, determining the first opening degree according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump includes: substituting the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump into a pre-constructed opening degree calculation function, and obtaining the first opening degree according to the opening degree calculation function; wherein, the opening degree calculation function is fitted based on different outdoor ambient temperatures, water inlet temperatures and their corresponding expansion valve opening degrees when the evaporator is not frosted.

[0013] In the embodiments of the present disclosure, when the evaporator is not frosted, tests are performed at different outdoor ambient temperatures and different water inlet temperatures. The different outdoor ambient temperatures, water inlet temperatures and their corresponding first opening degrees of the expansion valve obtained through the above process are fitted to obtain the opening degree calculation function, so that the first opening degree obtained by the opening degree calculation function based on the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump facilitates the system of the expansion valve driving the air source heat pump to quickly tend to be stable.

[0014] In some embodiments, the first opening degree is positively correlated with the current outdoor ambient temperature, and the first opening degree is positively correlated with the current water inlet temperature of the air source heat pump.

[0015] In some embodiments, determining the opening degree compensation value according to the detection results of the low-pressure pressure and the suction superheat includes: determining whether the low-pressure pressure and the temperature threshold meet a preset compensation start condition; when the low-pressure pressure and the suction superheat meet the preset compensation start condition, calculating the decreasing rate of the suction superheat; and determining the opening degree compensation value according to the decreasing rate of the suction superheat.

[0016] In the embodiments of the present disclosure, it is determined whether the first opening degree needs to be corrected according to the change of the low-pressure pressure and the suction superheat of the air source heat pump. When the low-pressure pressure and the suction superheat meet the preset compensation start condition, it can be determined that the first opening degree needs to be corrected. At this time, the opening degree compensation value can be accurately determined according to the decreasing rate of the suction superheat. By correcting the first opening degree with the opening degree compensation value, the system of the air source heat pump can accurately enter a stable state.

[0017] In some embodiments, the compensation start condition includes: the low-pressure pressure is less than the pressure threshold, and the suction superheat is greater than the temperature threshold.

[0018] In some embodiments, the compensation start condition includes: within a second duration, the low-pressure pressure continuously is less than the pressure threshold, and the suction superheat continuously is greater than the temperature threshold.

[0019] In some embodiments, determining an opening compensation value according to the decreasing rate of the suction superheat includes: when the decreasing rate of the suction superheat is greater than or equal to a rate threshold, taking a first preset value as the opening compensation value; when the decreasing rate of the suction superheat is less than the rate threshold, taking a second preset value as the opening compensation value, where the first preset value is less than the second preset value.

[0020] In some embodiments, the expansion valve control method further includes: starting to accumulate time after adjusting the opening of the expansion valve to a first opening; when it is determined that the accumulated time reaches a third duration, adjusting the opening of the expansion valve according to a preset automatic adjustment mode.

[0021] In the embodiments of the present disclosure, after adjusting the opening of the expansion valve to the first opening, if the accumulated time reaches the third duration, it can be basically determined that the system of the air source heat pump has entered a stable state. In this case, adjusting the opening of the expansion valve according to the preset automatic adjustment mode can enable the opening of the expansion valve to conform to the subsequent actual working conditions of the air source heat pump in a timely manner.

[0022] According to a second aspect of the present disclosure, there is provided an expansion valve control device for an air source heat pump, including a processor and a memory storing program instructions, the processor being configured to execute the expansion valve control method for an air source heat pump provided in the first aspect of the present disclosure when running the program instructions.

[0023] According to a third aspect of the present disclosure, there is provided an air source heat pump, including:

[0024] An expansion valve;

[0025] The expansion valve control device for an air source heat pump provided in the second aspect of the present disclosure, the expansion valve control device being electrically connected to the expansion valve.

[0026] The expansion valve control method, device and air source heat pump for an air source heat pump provided in the embodiments of the present disclosure can achieve the following technical effects:

[0027] The expansion valve control method for an air source heat pump provided in the embodiments of the present disclosure, when determining that the defrosting of the evaporator ends, first adjusts the opening of the expansion valve to a first opening according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump, so that the system of the air source heat pump can quickly tend to be stable. Then, according to the low-pressure pressure and the change of the suction superheat of the air source heat pump, the opening compensation value is further accurately determined to correct the first opening, so that the system of the air source heat pump can accurately enter a stable state and can also avoid frequent fluctuations in the opening of the expansion valve.

[0028] The above general description and the following description are only exemplary and explanatory and are not used to limit the present disclosure. Description of the Drawings

[0029] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and wherein:

[0030] Figure 1 is a structural diagram of an air source heat pump provided by an embodiment of the present disclosure;

[0031] Figure 2 is a schematic flow chart of a method for controlling an expansion valve for an air source heat pump provided by an embodiment of the present disclosure;

[0032] Figure 3 is a schematic flow chart of another method for controlling an expansion valve for an air source heat pump provided by an embodiment of the present disclosure;

[0033] Figure 4 is a schematic flow chart of another method for controlling an expansion valve for an air source heat pump provided by an embodiment of the present disclosure;

[0034] Figure 5 is a schematic flow chart of another method for controlling an expansion valve for an air source heat pump provided by an embodiment of the present disclosure;

[0035] Figure 6 is a schematic structural diagram of a device for controlling an expansion valve for an air source heat pump provided by an embodiment of the present disclosure. Detailed implementation manners

[0036] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are for reference and illustration purposes only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner.

[0037] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the embodiments of the present disclosure are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0038] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", and "rear" is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0039] In addition, the terms "arrangement", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0040] Unless otherwise specified, the term "plurality" means two or more.

[0041] In the embodiments of the present disclosure, the character " / " indicates that the front and rear objects are in an "or" relationship. For example, A / B means: A or B.

[0042] The term "and / or" is a description of the association relationship of an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0043] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0044] When the air source heat pump operates in the heating season, the evaporator will inevitably frost, so it is necessary to defrost the evaporator in time. However, after defrosting the evaporator, the system state of the air source heat pump will become relatively chaotic. Specifically, for example, if the opening degree of the expansion valve is too large after defrosting, liquid may be carried in the suction during operation; if the opening degree of the expansion valve is too small after defrosting, low-pressure alarm may be caused; if the opening degree of the expansion valve is adjusted according to the normal operation suction superheat degree after defrosting, too slow or over-adjustment will also cause liquid to be carried in the suction or low-pressure alarm. Therefore, accurately assigning the opening degree of the expansion valve at this time is an effective means to stabilize the system.

[0045] However, in the related art, it is difficult to accurately determine the opening degree of the expansion valve suitable for the current system state after the air source heat pump defrosts, which causes the system to fail to enter a stable state within a short time after the air source heat pump defrosts.

[0046] As shown in Figure 1 In the embodiments of the present disclosure, an air source heat pump is provided. The air source heat pump includes a compressor, a condenser, an expansion valve, and an evaporator. The compressor, the condenser, the expansion valve, and the evaporator are connected in a circulating manner through pipelines. In the embodiments of the present disclosure, the evaporator may be a finned heat exchanger, and the condenser includes a shell-and-tube heat exchanger.

[0047] The compressor compresses the low-pressure gaseous refrigerant in the evaporator into a high-temperature and high-pressure gaseous state. Subsequently, the high-temperature and high-pressure gaseous refrigerant output by the compressor enters the condenser, where the refrigerant releases heat to the cooling medium (usually air or water), and the refrigerant condenses into a high-pressure liquid state. After the liquid refrigerant leaves the condenser, it passes through the expansion valve to reduce the pressure. The pressure drop causes part of the refrigerant to evaporate, and at the same time the temperature also drops, preparing for effective heat absorption in the evaporator. After throttling, the refrigerant enters the evaporator in a low-temperature and low-pressure state, absorbs heat from the outside (usually from indoor air or water source) again and evaporates into a gaseous state, completing the next starting point of the refrigeration cycle.

[0048] In the embodiments of the present disclosure, the air source heat pump further includes an expansion valve control device for the air source heat pump. The expansion valve control device is electrically connected to the evaporator, and the expansion valve control device can execute the expansion valve control method for the air source heat pump provided by the embodiments of the present disclosure.

[0049] As shown in Figure 2 In the embodiments of the present disclosure, an expansion valve control method for an air source heat pump is provided. The control method includes:

[0050] S201, when the control device determines that the defrosting of the evaporator is completed, determine a first opening degree according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump.

[0051] In the embodiments of the present disclosure, the first opening degree is positively correlated with the current outdoor ambient temperature, and the first opening degree is positively correlated with the current water inlet temperature of the air source heat pump.

[0052] The embodiments of the present disclosure preset the mapping relationship between the opening degree of the evaporator and the outdoor ambient temperature and the water inlet temperature of the air source heat pump. This preset relationship represents the opening degree of the expansion valve that can make the system of the air source heat pump approach stability corresponding to different outdoor ambient temperatures and the current water inlet temperature of the air source heat pump when the evaporator is not frosted. Here, according to the above mapping relationship, the current outdoor ambient temperature, and the current water inlet temperature of the air source heat pump, the first opening degree is determined in a timely and accurate manner.

[0053] S202, the control device adjusts the opening degree of the expansion valve to the first opening degree.

[0054] S203, within the first time period after the defrosting of the evaporator ends, the control device detects the low-pressure pressure and the suction superheat degree of the air source heat pump, and determines the opening degree compensation value according to the detection results of the low-pressure pressure and the suction superheat degree.

[0055] In the embodiments of the present disclosure, the value of the first time period can be determined according to actual design requirements. Here, the value range of the first time period is from 1 minute to 5 minutes.

[0056] S204, the control device adjusts the opening degree of the expansion valve to the second opening degree according to the opening degree compensation value.

[0057] The expansion valve control method for an air source heat pump provided by the embodiments of the present disclosure, when determining that the defrosting of the evaporator ends, first adjusts the opening degree of the expansion valve to the first opening degree according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump, so that the system of the air source heat pump can quickly tend to be stable. Then, according to the changes in the low-pressure pressure and the suction superheat degree of the air source heat pump, the opening degree compensation value is further accurately determined to correct the first opening degree, so that the system of the air source heat pump can accurately enter the stable state, and the frequent fluctuation of the opening degree of the expansion valve can also be avoided.

[0058] In some embodiments, determining the first opening degree according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump includes: substituting the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump into a pre-constructed opening degree calculation function, and obtaining the first opening degree according to the opening degree calculation function; wherein, the opening degree calculation function is obtained by fitting different outdoor ambient temperatures, water inlet temperatures and their corresponding expansion valve opening degrees when the evaporator is not frosted.

[0059] In the embodiments of the present disclosure, when the evaporator is not frosted, tests are carried out at different outdoor ambient temperatures and different water inlet temperatures. The different outdoor ambient temperatures, water inlet temperatures and their corresponding first opening degrees of the expansion valve obtained through the above process are used to fit the opening degree calculation function, so that the first opening degree obtained by the opening degree calculation function based on the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump is convenient for the expansion valve to drive the system of the air source heat pump to quickly tend to be stable.

[0060] Combined with Figure 3 As shown, the embodiments of the present disclosure provide another expansion valve control method for an air source heat pump, and the control method includes:

[0061] S301. When the control device determines that the defrosting of the evaporator is completed, it substitutes the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump into a pre-constructed opening calculation function, and obtains a first opening according to the opening calculation function.

[0062] In the embodiments of the present disclosure, the opening calculation function is obtained by fitting different outdoor ambient temperatures, water inlet temperatures, and their corresponding expansion valve openings when the evaporator is not frosted.

[0063] When the evaporator is not frosted, tests are run at different outdoor ambient temperatures and different water inlet temperatures. For each outdoor ambient temperature and water inlet temperature, the average opening of the expansion valve within b minutes after the air source heat pump has been operating stably for a minutes without frosting is used as the first opening of the expansion valve after the evaporator is defrosted. The different outdoor ambient temperatures, water inlet temperatures, and their corresponding first openings of the expansion valve obtained through the above process are used to fit the opening calculation function.

[0064] In the embodiments of the present disclosure, the expression of the opening calculation function is: X = aTao + bTewi + c.

[0065] In the above expression of the opening calculation function, X is the first opening, Tao is the outdoor ambient temperature, Tewi is the current water inlet temperature of the air source heat pump, a and b are coefficients, and c is a constant. a, b, and c are all obtained during the fitting process of the opening calculation function.

[0066] In the above expression of the opening calculation function, the first opening is positively correlated with the current outdoor ambient temperature, and the first opening is positively correlated with the current water inlet temperature of the air source heat pump.

[0067] S302. The control device adjusts the opening of the expansion valve to the first opening.

[0068] S303. Within a first period of time after the defrosting of the evaporator is completed, the control device detects the low-pressure pressure and the suction superheat degree of the air source heat pump, and determines an opening compensation value according to the detection results of the low-pressure pressure and the suction superheat degree.

[0069] S304. The control device adjusts the opening of the expansion valve to a second opening according to the opening compensation value.

[0070] In some embodiments, determining the opening compensation value according to the detection results of the low-pressure pressure and the suction superheat degree includes: determining whether the low-pressure pressure and the temperature threshold meet a preset compensation start condition; when the low-pressure pressure and the suction superheat degree meet the preset compensation start condition, calculating the decreasing rate of the suction superheat degree; and determining the opening compensation value according to the decreasing rate of the suction superheat degree.

[0071] In the embodiments of the present disclosure, it is determined whether the first opening needs to be corrected according to the low-pressure pressure and the change of the suction superheat degree of the air source heat pump. When the low-pressure pressure and the suction superheat degree meet the preset compensation start conditions, it can be determined that the first opening needs to be corrected. At this time, the opening compensation value can be accurately determined according to the decreasing rate of the suction superheat degree. By using the opening compensation value to correct the first opening, the system of the air source heat pump can accurately enter the stable state.

[0072] Combined with Figure 4 As shown, the embodiments of the present disclosure provide another expansion valve control method for an air source heat pump. The control method includes:

[0073] S401. When the control device determines that the defrosting of the evaporator is completed, the first opening is determined according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump.

[0074] S402. The control device adjusts the opening of the expansion valve to the first opening.

[0075] S403. Within the first time period after the defrosting of the evaporator ends, the control device detects the low-pressure pressure and the suction superheat degree of the air source heat pump, and determines whether the low-pressure pressure and the temperature threshold meet the preset compensation start conditions.

[0076] In the embodiments of the present disclosure, the compensation start conditions include: the low-pressure pressure is less than the pressure threshold, and the suction superheat degree is greater than the temperature threshold. Specifically, within the first time period after the defrosting of the evaporator ends, when the control device detects that the low-pressure pressure of the air source heat pump is less than the pressure threshold and the suction superheat degree is greater than the temperature threshold, it is determined that the low-pressure pressure and the suction superheat degree meet the preset compensation start conditions.

[0077] In the embodiments of the present disclosure, the compensation start conditions include: within the second time period, the low-pressure pressure continuously is less than the pressure threshold, and the suction superheat degree continuously is greater than the temperature threshold. Specifically, within the first time period after the defrosting of the evaporator ends, when the control device detects that the low-pressure pressure of the air source heat pump continuously is less than the pressure threshold within the second time period and the suction superheat degree continuously is greater than the temperature threshold within the second time period, it is determined that the low-pressure pressure and the suction superheat degree meet the preset compensation start conditions.

[0078] In the embodiments of the present disclosure, the pressure threshold and the temperature threshold can be determined according to actual design requirements. Here, the value range of the pressure threshold is 0.01 MPa to 0.05 MPa, and the value range of the temperature threshold is 10 °C to 20 °C.

[0079] In the embodiments of the present disclosure, the value of the second time period can be determined according to actual design requirements. Here, the value range of the second time period is 1 s to 5 s.

[0080] S404. When the low - pressure pressure and the suction superheat satisfy the preset compensation start conditions, the control device calculates the decreasing rate of the suction superheat.

[0081] S405. The control device determines an opening compensation value according to the decreasing rate of the suction superheat.

[0082] In the embodiment of the present disclosure, determining the opening compensation value according to the decreasing rate of the suction superheat includes: when the decreasing rate of the suction superheat is greater than or equal to the rate threshold, taking a first preset value as the opening compensation value; when the decreasing rate of the suction superheat is less than the rate threshold, taking a second preset value as the opening compensation value, where the first preset value is less than the second preset value.

[0083] In the embodiment of the present disclosure, the rate threshold can be determined according to actual design requirements. Here, the value range of the rate threshold is from 3 degrees Celsius per second to 5 degrees Celsius per second.

[0084] S406. The control device adjusts the opening of the expansion valve to a second opening according to the opening compensation value.

[0085] In some embodiments, the expansion valve control method further includes: starting to accumulate time after adjusting the opening of the expansion valve to a first opening; when it is determined that the accumulated time reaches a third duration, adjusting the opening of the expansion valve according to a preset automatic adjustment mode.

[0086] In the embodiment of the present disclosure, after adjusting the opening of the expansion valve to the first opening, if the accumulated time reaches the third duration, it can be basically determined that the system of the air - source heat pump has entered a stable state. In this case, adjusting the opening of the expansion valve according to the preset automatic adjustment mode can make the opening of the expansion valve conform to the subsequent actual working conditions of the air - source heat pump in a timely manner.

[0087] Combined Figure 5 As shown, the embodiment of the present disclosure provides another expansion valve control method for an air - source heat pump. The control method includes:

[0088] S501. When the control device determines that the defrosting of the evaporator is completed, it determines a first opening according to the current outdoor ambient temperature and the current water inlet temperature of the air - source heat pump.

[0089] S502. The control device adjusts the opening of the expansion valve to the first opening.

[0090] After S502, S503 and S505 are executed.

[0091] S503. Within a first duration after the defrosting of the evaporator is completed, the control device detects the low - pressure pressure and the suction superheat of the air - source heat pump, and determines an opening compensation value according to the detection results of the low - pressure pressure and the suction superheat.

[0092] S504. The control device adjusts the opening degree of the expansion valve to a second opening degree according to the opening degree compensation value.

[0093] S505. The control device starts accumulating time after adjusting the opening degree of the expansion valve to a first opening degree.

[0094] S506. When the control device determines that the accumulated time reaches a third time duration, it adjusts the opening degree of the expansion valve according to a preset automatic adjustment mode.

[0095] In the embodiments of the present disclosure, the third time duration can be determined according to the outdoor ambient temperature detected at the end of evaporator defrosting and the water inlet temperature of the air source heat pump.

[0096] Specifically, a first temperature difference between the outdoor ambient temperature detected at the end of evaporator defrosting and an outdoor temperature threshold can be calculated, and a second temperature difference between the water inlet temperature of the air source heat pump detected at the end of evaporator defrosting and a water inlet temperature threshold can be calculated. A time margin is calculated according to the first temperature difference and the second temperature difference, and the sum value of the basic time duration and the time margin is used as the third time duration.

[0097] In the embodiments of the present disclosure, the time margin is positively correlated with both the first temperature difference and the second temperature difference. The outdoor temperature threshold, the water inlet temperature threshold, and the basic time duration can be determined according to actual design requirements.

[0098] Combined Figure 6 As shown, the expansion valve control device 6 for an air source heat pump provided in the embodiments of the present disclosure includes a processor 61 and a memory 62. Optionally, the expansion valve control device 6 may further include a communication interface 63 and a bus 64. Among them, the processor 61, the communication interface 63, and the memory 62 can complete communication with each other through the bus 64. The communication interface 63 can be used for information transmission. The processor 61 can call the logical instructions in the memory 62 to execute the expansion valve control method for the air source heat pump in the above embodiments.

[0099] In addition, when the logical instructions in the above-mentioned memory 62 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0100] The memory 62, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 61 executes functional applications and data processing by running the program instructions / modules stored in the memory 62, that is, implements the methods in the above embodiments.

[0101] The memory 62 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 62 may include a high-speed random access memory and may also include a non-volatile memory.

[0102] Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above control method for the exhaust part.

[0103] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, etc., which are various media that can store program codes.

[0104] The above description and the drawings fully illustrate embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this disclosure are only for describing embodiments and do not limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this disclosure, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this disclosure, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. In this article, what each embodiment focuses on can be the differences from other embodiments, and the same or similar parts among various embodiments can be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts can be referred to the description of the method part.

[0105] The above description and the drawings fully illustrate embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

[0106] Those skilled in the art will realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0107] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the couplings or direct couplings or communication connections shown or discussed with each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0108] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. In the description corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. An expansion valve control method for an air source heat pump, characterized in that, Including: When it is determined that the defrosting of the evaporator ends, a first opening degree is determined according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump; Adjust the opening degree of the expansion valve to the first opening degree; Within the first time period after the defrosting of the evaporator ends, detect the low-pressure pressure and the suction superheat degree of the air source heat pump, and determine an opening degree compensation value according to the detection results of the low-pressure pressure and the suction superheat degree; Adjust the opening degree of the expansion valve to a second opening degree according to the opening degree compensation value.

2. The expansion valve control method according to claim 1, wherein Determining a first opening degree according to the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump includes: Substitute the current outdoor ambient temperature and the current water inlet temperature of the air source heat pump into a pre-constructed opening degree calculation function, and obtain the first opening degree according to the opening degree calculation function; Wherein, the opening degree calculation function is obtained by fitting different outdoor ambient temperatures, water inlet temperatures and their corresponding expansion valve opening degrees when the evaporator is not frosted.

3. The expansion valve control method according to claim 1, characterized in that The first opening degree is positively correlated with the current outdoor ambient temperature, and the first opening degree is positively correlated with the current water inlet temperature of the air source heat pump.

4. The expansion valve control method according to any one of claims 1 to 3, characterized in that, Determining an opening degree compensation value according to the detection results of the low-pressure pressure and the suction superheat degree includes: Judge whether the low-pressure pressure and the temperature threshold meet a preset compensation start condition; When the low-pressure pressure and the suction superheat degree meet the preset compensation start condition, calculate the decreasing rate of the suction superheat degree; Determine the opening degree compensation value according to the decreasing rate of the suction superheat degree.

5. The expansion valve control method according to claim 4, characterized in that, The compensation start condition includes: the low-pressure pressure is less than the pressure threshold, and the suction superheat degree is greater than the temperature threshold.

6. The expansion valve control method according to claim 4, wherein, The compensation start condition includes: within the second time period, the low-pressure pressure continuously is less than the pressure threshold, and the suction superheat degree continuously is greater than the temperature threshold.

7. The expansion valve control method according to claim 4, characterized in that Determining an opening degree compensation value according to the decreasing rate of the suction superheat degree includes: When the decreasing rate of the suction superheat degree is greater than or equal to the rate threshold, use the first preset value as the opening degree compensation value; When the decreasing rate of the suction superheat degree is less than the rate threshold, use the second preset value as the opening degree compensation value, wherein the first preset value is less than the second preset value.

8. The expansion valve control method according to any one of claims 1 to 3, characterized in that, It also includes: Start accumulating time after adjusting the opening degree of the expansion valve to the first opening degree; When it is determined that the accumulated time reaches the third time period, adjust the opening degree of the expansion valve according to a preset automatic adjustment mode.

9. An expansion valve control device for an air source heat pump, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the expansion valve control method for an air source heat pump according to any one of claims 1 to 8 when running program instructions.

10. An air source heat pump, characterized in that, Including: An expansion valve; The expansion valve control device for an air source heat pump according to claim 9, and the expansion valve control device is electrically connected to the expansion valve.

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