Enthalpy-increasing control method and air source heat pump

Abstract

The application provides an enthalpy-increasing control method and an air source heat pump. The air source heat pump comprises a refrigerant circulation system, the refrigerant circulation system comprises a compressor, an indoor heat exchanger and an outdoor heat exchanger connected with the compressor, and a first refrigerant pipe connected with the indoor heat exchanger and the outdoor heat exchanger; an enthalpy-increasing assembly, the enthalpy-increasing assembly comprises a second refrigerant pipe, a heat absorption structure and an enthalpy-increasing valve; the heat absorption structure is configured to absorb waste heat of the compressor, an outlet of the heat absorption structure is connected with an enthalpy-increasing port of the compressor, and an inlet of the heat absorption structure is connected with the first refrigerant pipe through the second refrigerant pipe; the second refrigerant pipe is provided with the enthalpy-increasing valve; wherein the enthalpy-increasing valve is configured to be opened when the running condition of the air source heat pump meets preset entering conditions of an enthalpy-increasing stage, so as to allow refrigerant in the first refrigerant pipe to enter the heat absorption structure through the second refrigerant pipe, and make the refrigerant in the heat absorption structure enter the compressor after absorbing the waste heat of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange systems, in particular to an enthalpy-increasing control method and an air source heat pump. BACKGROUND

[0002] Air source heat pumps are increasingly applied in residential heating. However, the heating capacity of air source heat pumps will decrease in low temperature conditions. In the prior art, the problem is generally solved by starting jet enthalpy increase in low temperature conditions, but the room jet enthalpy increase requires the addition of an economizer or a flash tank system, which leads to complex system pipelines. SUMMARY

[0003] The main purpose of the present application is to provide an enthalpy-increasing control method and an air source heat pump, aiming to solve the technical problem of complex air source heat pump enthalpy-increasing pipelines in the prior art.

[0004] The present application provides an air source heat pump, which comprises:

[0005] A refrigerant circulation system, comprising a compressor, an indoor heat exchanger and an outdoor heat exchanger connected to the compressor, and a first refrigerant pipe connecting the indoor heat exchanger and the outdoor heat exchanger;

[0006] An enthalpy-increasing assembly, comprising a second refrigerant pipe, a heat absorption structure and an enthalpy-increasing valve; the heat absorption structure is configured to absorb waste heat of the compressor, the outlet of the heat absorption structure is connected to the enthalpy-increasing port of the compressor, and the inlet of the heat absorption structure is connected to the first refrigerant pipe through the second refrigerant pipe;

[0007] The enthalpy-increasing valve is configured to be opened when the operating condition of the air source heat pump meets the preset entering condition of the enthalpy-increasing stage, so as to allow the refrigerant in the first refrigerant pipe to enter the heat absorption structure through the second refrigerant pipe, so that the refrigerant entering the heat absorption structure absorbs the waste heat of the compressor and then enters the compressor.

[0008] Optionally, the air source heat pump further comprises:

[0009] A first temperature detection device configured to collect the outlet temperature of the heat absorption structure;

[0010] A second temperature detection device configured to collect the inlet temperature of the heat absorption structure;

[0011] The difference between the outlet temperature and the inlet temperature is used to determine the opening degree adjustment value of the enthalpy-increasing valve.

[0012] Optionally, the air source heat pump further comprises:

[0013] A third temperature detection device configured to collect the outdoor environment temperature; and / or

[0014] a fourth temperature detection device configured to acquire a water inlet temperature of the indoor heat exchanger;

[0015] The outdoor ambient temperature and / or the water inlet temperature are used to determine an initial opening degree of the enthalpy increasing valve.

[0016] Optionally, the preset entering condition comprises that the air source heat pump operates in a heating mode; a running frequency of the compressor is greater than a first preset frequency; a running time length of the compressor is greater than a first preset time length; an exhaust temperature of the compressor is greater than a first preset temperature and lasts for a second preset time length; and an outdoor ambient temperature is less than a second preset temperature.

[0017] Embodiments of the present application also provide an enthalpy increasing control method applied to the air source heat pump as described above, and the control method comprises:

[0018] judging whether a running condition of the air source heat pump meets a preset entering condition of an enthalpy increasing stage;

[0019] if yes, controlling the enthalpy increasing valve to open, so as to allow the refrigerant in the first refrigerant pipe to enter the heat absorption structure through the second refrigerant pipe, and make the refrigerant entering the heat absorption structure absorb the waste heat of the compressor and then enter the compressor.

[0020] Optionally, after the enthalpy increasing valve is controlled to open, the control method further comprises:

[0021] acquiring an outlet temperature of the heat absorption structure and an inlet temperature of the heat absorption structure;

[0022] determining an opening degree adjustment value of the enthalpy increasing valve and an adjustment time length of the enthalpy increasing valve according to a difference between the outlet temperature and the inlet temperature;

[0023] adjusting the opening degree of the enthalpy increasing valve according to the opening degree adjustment value, and reacquiring the outlet temperature of the heat absorption structure and the inlet temperature of the heat absorption structure after the adjustment time length.

[0024] Optionally, determining the opening degree adjustment value of the enthalpy increasing valve according to the difference between the outlet temperature and the inlet temperature comprises:

[0025] if the difference is less than a first preset value, the opening degree adjustment value is a negative value;

[0026] if the difference is greater than a second preset value, the opening degree adjustment value is a positive value;

[0027] if the difference is between the first preset value and the second preset value, the opening degree adjustment value is 0.

[0028] Optionally, the control of the opening of the enthalpy increasing valve comprises:

[0029] obtaining an outdoor ambient temperature and / or a water inlet temperature;

[0030] determining an initial opening degree of the enthalpy increasing valve according to the outdoor ambient temperature and / or the water inlet temperature;

[0031] controlling the opening of the enthalpy increasing valve according to the initial opening degree.

[0032] Optionally, before the control of the opening of the enthalpy increasing valve according to the initial opening degree, the enthalpy increasing control method comprises:

[0033] controlling the opening of the enthalpy increasing valve at a first set opening degree;

[0034] controlling the opening of the enthalpy increasing valve according to the initial opening degree after the enthalpy increasing valve is opened at the first set opening degree for a third preset time length.

[0035] Optionally, after the control of the opening of the enthalpy increasing valve, the control method further comprises:

[0036] judging whether an operating condition of the air source heat pump meets a preset exit condition for exiting the enthalpy increasing stage; the preset exit condition comprises that the air source heat pump receives a shutdown instruction, a refrigerant recovery instruction or a defrosting instruction; or an operating frequency of the compressor is less than a first preset frequency; or an outdoor ambient temperature is greater than a second preset temperature;

[0037] if yes, controlling the closing of the enthalpy increasing valve.

[0038] In the technical scheme of the embodiments of the present application, when the operating condition of the air source heat pump meets the preset entering condition for entering the enthalpy increasing stage, the enthalpy increasing valve is opened, and then the refrigerant in the first refrigerant pipe enters the heat absorbing structure through the second refrigerant pipe, so that the refrigerant entering the heat absorbing structure absorbs the waste heat of the compressor and then enters the compressor, and the waste heat generated in the operation of the compressor is used to heat the refrigerant entering the compressor, so as to achieve the purpose of increasing the enthalpy. In the technical scheme of the embodiments of the present application, an economizer or a flash tank does not need to be added in the refrigerant circulation system, but a second refrigerant pipe is connected to the first refrigerant pipe connecting the indoor heat exchanger and the outdoor heat exchanger, so that a part of the refrigerant in the refrigerant circulation system is branched off to be heated by the waste heat when the enthalpy increasing valve is opened. In this way, not only the waste heat generated by the compressor can be reused, but also the economizer or the flash tank can be removed, and the pipeline of the jet enthalpy increasing system is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of an air source heat pump provided in an embodiment of this application;

[0041] Figure 2 A schematic flowchart of the enthalpy increase control method provided in this application embodiment;

[0042] Figure 3 Another schematic flowchart of the enthalpy increase control method provided in the embodiments of this application;

[0043] Figure 4 for Figure 3 A flowchart illustrating the sub-steps of step S400;

[0044] Figure 5 for Figure 2 A flowchart illustrating a sub-step of step S200;

[0045] Figure 6 for Figure 2 A flowchart illustrating another sub-step of step S200;

[0046] Figure 7 This is another schematic flowchart of the enthalpy increase control method provided in the embodiments of this application.

[0047] Attached reference numerals: 1. Compressor; 2. Heat absorption structure; 3. Second refrigerant pipe; 4. Enthalpy-increasing valve; 5. First refrigerant pipe; 6. Indoor heat exchanger; 7. Outdoor heat exchanger; 8. Four-way valve; 9. Expansion valve. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In addition, if the present application has a description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. For example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in the present application.

[0052] As shown in Figure 1 The present application provides an air source heat pump, which comprises:

[0053] A refrigerant circulation system, which comprises a compressor 1, an indoor heat exchanger 6 and an outdoor heat exchanger 7 connected with the compressor 1, and a first refrigerant pipe 5 connecting the indoor heat exchanger 6 and the outdoor heat exchanger 7;

[0054] An enthalpy increasing assembly, which comprises a second refrigerant pipe 3, a heat absorption structure 2 and an enthalpy increasing valve 4; the heat absorption structure 2 is configured to absorb the waste heat of the compressor 1, the outlet of the heat absorption structure 2 is connected with the enthalpy increasing port of the compressor 1, and the inlet of the heat absorption structure 2 is connected with the first refrigerant pipe 5 through the second refrigerant pipe 3;

[0055] The enthalpy increasing valve 4 is configured to be opened when the operating condition of the air source heat pump meets the preset entering condition of entering the enthalpy increasing stage, so as to allow the refrigerant in the first refrigerant pipe 5 to enter the heat absorption structure 2 through the second refrigerant pipe 3, so that the refrigerant entering the heat absorption structure 2 absorbs the waste heat of the compressor 1 and then enters the compressor 1.

[0056] In the technical scheme of the embodiment of the present application, when the operation condition of the air source heat pump meets the preset entering condition for entering the enthalpy increasing stage, the enthalpy increasing valve 4 is opened, and then the refrigerant in the first refrigerant pipe 5 enters the heat absorption structure 2 through the second refrigerant pipe 3, so that the refrigerant entering the heat absorption structure 2 absorbs the waste heat of the compressor 1 and then enters the compressor 1, and the waste heat generated in the operation of the compressor 1 is used to heat the refrigerant entering the compressor 1 to achieve the purpose of increasing the enthalpy. In the technical scheme of the embodiment of the present application, an economizer or a flash tank does not need to be added to the refrigerant circulation system, but the second refrigerant pipe 3 is connected to the first refrigerant pipe 5 connecting the indoor heat exchanger 6 and the outdoor heat exchanger 7, so that a part of the refrigerant in the refrigerant circulation system is branched off to be heated by the waste heat when the enthalpy increasing valve 4 is opened. In this way, the waste heat generated by the compressor 1 can be reused, and the economizer or the flash tank can be removed, and the pipeline of the jet enthalpy increasing system is simplified.

[0057] It should be noted that the air source heat pump is prone to heat attenuation in the heating process due to low ambient temperature, and therefore the enthalpy increasing assembly is operated when the air source heat pump is heating. When the air source heat pump is heating, the working mechanism of the refrigerant circulation system is as follows: the refrigerant discharged by the compressor 1 flows to the indoor heat exchanger 6 through the four-way valve 8, and then the refrigerant exchanges heat with indoor air and / or water in the indoor heat exchanger 6 and then flows to the outdoor heat exchanger 7 through the first refrigerant pipe 5. After the refrigerant exchanges heat with outdoor air in the outdoor heat exchanger 7, the refrigerant flows to the compressor 1 through the four-way valve 8 and is compressed by the compressor 1. When the air source heat pump meets the preset entering condition, the enthalpy increasing valve 4 is opened, and the refrigerant flowing out after heat exchange in the indoor heat exchanger 6 enters the second refrigerant pipe 3 and is heated by the waste heat in the heat absorption structure 2. This part of the refrigerant absorbs the waste heat of the compressor 1 dissipated to the heat absorption structure 2 in the heat absorption structure 2, and then enters the enthalpy increasing port of the compressor 1 after absorbing the waste heat of the compressor 1, and is used for the enthalpy increasing work of the compressor 1. The other part enters the outdoor heat exchanger 7 to exchange heat and then returns to the compressor 1 (for example, the liquid storage tank of the compressor 1). The two parts of the refrigerant are compressed by the compressor 1 and then discharged through the exhaust port, and the refrigerant circulation and the enthalpy increasing operation are completed.

[0058] In some embodiments, the heat absorption structure 2 in the system can be configured as a reheat plate structure. The reheat plate is tightly attached to the cylinder body of the compressor 1 to absorb the waste heat of the compressor 1 (in the form of heat conduction), collects the waste heat generated by the motor winding during the operation of the compressor 1, and then transmits the waste heat to the refrigerant flowing through the pipe (metal pipe such as copper pipe, aluminum pipe, etc.) in the reheat plate, so that the refrigerant is vaporized and enters the jet enthalpy increasing port of the compressor 1.

[0059] In some embodiments, the reheating plate can also absorb the waste heat of the compressor 1 by means of heat radiation, such as the reheating plate being arranged around the cylinder of the compressor 1 (not in contact).

[0060] In embodiments, the first refrigerant pipe 5 is provided with an expansion valve 9; the position where the second refrigerant pipe 3 is connected to the first refrigerant pipe 5 is located downstream of the expansion valve 9 (in the heating mode).

[0061] As an optional implementation of the above embodiment, the preset entering condition comprises: the air source heat pump is operated in the heating mode, the operating frequency of the compressor 1 is greater than a first preset frequency; the operating time length of the compressor 1 is greater than a first preset time length; the exhaust temperature of the compressor 1 is greater than a first preset temperature and lasts for a second preset time length; and the outdoor environment temperature is less than a second preset temperature. In embodiments, the first preset frequency, the first preset time length, the first preset temperature, the second preset temperature, and the second preset time length are set by the user according to specific conditions or are factory-set parameters. The preset entering condition refers to the condition that the operating parameters of the compressor 1 are difficult to overcome the decay of the heating capacity of the air source heat pump in a low-temperature environment when the air source heat pump is operated in the heating mode.

[0062] As an optional implementation of the above embodiment, the air source heat pump further comprises a first temperature detection device and a second temperature detection device. The first temperature detection device is configured to collect the outlet temperature of the heat absorption structure 2; and the second temperature detection device is configured to collect the inlet temperature of the heat absorption structure 2. The difference between the outlet temperature and the inlet temperature is used to determine the opening adjustment value of the enthalpy increasing valve 4. By measuring the difference between the inlet temperature and the outlet temperature of the heat absorption structure 2, the opening adjustment value of the enthalpy increasing valve 4 is controlled to adjust the flow of the refrigerant entering the heat absorption structure 2 according to the difference between the inlet temperature and the outlet temperature, so as to adjust the heat absorbed by the refrigerant to match the current working condition, thereby improving the enthalpy increasing efficiency and the waste heat utilization rate.

[0063] In embodiments, the first temperature detection device and the second temperature detection device can both be temperature sensors or temperature sensing bags.

[0064] In embodiments, the enthalpy increasing valve 4 can be configured to have different openings, so that different flows of refrigerant can enter the heat absorption structure 2, and the opening adjustment value of the enthalpy increasing valve 4 is determined according to the difference between the inlet temperature and the outlet temperature of the heat absorption structure 2 each time the enthalpy increasing valve 4 is adjusted.

[0065] In embodiments, the difference and the opening adjustment value have a corresponding relationship, and the air source heat pump determines the opening adjustment value according to the corresponding relationship and the obtained difference.

[0066] As an optional implementation of the above embodiment, the air source heat pump further comprises: a third temperature detection device configured to collect an outdoor environment temperature; and / or a fourth temperature detection device configured to collect an inlet water temperature of the indoor heat exchanger 6; the outdoor environment temperature and / or the inlet water temperature are used to determine an initial opening degree of the enthalpy increasing valve 4. In an embodiment, according to different outdoor environment temperatures and / or different inlet water temperatures, the initial opening degree of the enthalpy increasing valve 4 when opened is determined, so that the refrigerant can quickly enter the enthalpy increasing stage according to the working condition, improve the enthalpy increasing efficiency to meet the current heating demand as soon as possible.

[0067] In an embodiment, the third temperature detection device and the fourth temperature detection device can both be temperature sensors or temperature sensing bags.

[0068] In some embodiments, when the air source heat pump enters the enthalpy increasing stage, the opening degree of the enthalpy increasing valve 4 is first opened to the initial opening degree, and after running for a certain time, the outlet temperature and the inlet temperature of the heat absorption structure 2 are collected, and then the opening degree of the enthalpy increasing valve 4 is adjusted according to the difference between the outlet temperature and the inlet temperature.

[0069] In an embodiment, the indoor heat exchanger 6 is further connected with a water supply system, the inlet water pipe of the water supply system is connected with the heat exchange water pipe of the indoor heat exchanger 6, and the outlet water pipe of the water supply system is connected with the heat exchange water pipe of the indoor heat exchanger 6; when hot water is needed, the water flow of the water supply pipe enters the heat exchange water pipe, and after the heat exchange water pipe exchanges heat with the heat exchange refrigerant pipe of the indoor heat exchanger 6 to heat the water, the water is transported to the water end (or hot water storage tank) through the outlet water pipe.

[0070] In an embodiment, the inlet water temperature and / or the outdoor environment temperature and the opening degree adjustment value have a corresponding relationship, and the air source heat pump determines the initial opening degree according to the corresponding relationship and the obtained inlet water temperature and / or outdoor environment temperature.

[0071] Referring to Figure 2 The embodiment of the present application also proposes an enthalpy increasing control method, which is applied to the air source heat pump of the above-mentioned embodiment, and the control method comprises:

[0072] S100, judging whether the running condition of the air source heat pump meets the preset entering condition of the enthalpy increasing stage;

[0073] S200, if yes, controlling the enthalpy increasing valve to open, so as to allow the refrigerant in the first refrigerant pipe to enter the heat absorption structure through the second refrigerant pipe, so that the refrigerant entering the heat absorption structure absorbs the waste heat of the compressor and then enters the compressor.

[0074] In the technical scheme of the embodiment of the present application, when it is judged that the operation condition of the air source heat pump meets the preset entering condition of entering the enthalpy increasing stage, the enthalpy increasing valve is controlled to be opened, and then the refrigerant in the first refrigerant pipe enters the heat absorbing structure through the second refrigerant pipe, so that the refrigerant entering the heat absorbing structure absorbs the waste heat of the compressor and then enters the compressor, and the waste heat generated in the operation of the compressor is used to heat the refrigerant entering the compressor enthalpy increasing port, so as to achieve the purpose of increasing the enthalpy. In the technical scheme of the embodiment of the present application, an economizer or a flash tank does not need to be added in the refrigerant circulation system, but a second refrigerant pipe is connected to the first refrigerant pipe connecting the indoor heat exchanger and the outdoor heat exchanger, so that a part of the refrigerant in the refrigerant circulation system is branched off to be heated by the waste heat when the enthalpy increasing valve is opened. In this way, not only the waste heat generated by the compressor can be reused, but also the economizer or the flash tank can be removed, and the pipeline of the jet enthalpy increasing system is simplified.

[0075] As an optional implementation manner of the above embodiment, as shown in Figure 3 the control method further comprises:

[0076] S300, acquiring the outlet temperature of the heat absorbing structure and the inlet temperature of the heat absorbing structure;

[0077] S400, determining the opening degree adjustment value of the enthalpy increasing valve and the adjustment time length of the enthalpy increasing valve according to the difference between the outlet temperature and the inlet temperature;

[0078] S500, adjusting the opening degree of the enthalpy increasing valve according to the opening degree adjustment value;

[0079] And after the adjustment time length, the outlet temperature of the heat absorbing structure and the inlet temperature of the heat absorbing structure are re-acquired.

[0080] The difference between the inlet temperature and the outlet temperature of the heat absorbing structure is measured to control the opening degree adjustment value of the enthalpy increasing valve, so as to adjust the flow of the refrigerant entering the heat absorbing structure according to the difference between the inlet temperature and the outlet temperature, to adjust the heat absorbed by the refrigerant to match the current working condition, to improve the enthalpy increasing efficiency and the waste heat utilization rate. And the adjustment time length of the enthalpy increasing valve is determined according to the difference, so as to re-acquire the outlet temperature of the heat absorbing structure and the inlet temperature of the heat absorbing structure after adjusting the opening degree, and further adjust the enthalpy increasing valve, so that the opening degree of the enthalpy increasing valve can quickly meet the current operation working condition.

[0081] As an optional implementation manner of the above embodiment, as shown in Figure 4 determining the opening degree adjustment value of the enthalpy increasing valve according to the difference between the outlet temperature and the inlet temperature comprises:

[0082] S410, if the difference is less than a first preset value, the opening degree adjustment value is a negative value;

[0083] S420, if the difference is greater than the second preset value, the opening degree adjustment value is a positive value;

[0084] S430, if the difference is between the first preset value and the second preset value, the opening degree adjustment value is 0.

[0085] In embodiments, if the difference is less than the first preset value, the opening degree adjustment value is a negative value, at which time the opening degree of the enthalpy increasing valve needs to be adjusted to decrease, so as to decrease the refrigerant flow and increase the heat absorption of the refrigerant; if the difference is greater than the second preset value, the opening degree adjustment value is a positive value, at which time the opening degree of the enthalpy increasing valve needs to be adjusted to increase, so as to increase the refrigerant flow and decrease the heat absorption of the refrigerant, so as to maintain the difference between the first preset value and the second preset value; and when the difference is between the first preset value and the second preset value, the opening degree adjustment value is 0, at which time the opening degree does not need to be adjusted and the current opening degree is maintained.

[0086] In some embodiments, the difference, the opening degree adjustment value and the adjustment duration refer to the following table:

[0087]

[0088] In the above table, the first preset temperature is 1℃; the second preset temperature is 8℃; A is greater than B, which is greater than C, which is greater than D (D is set to 0); T3 is greater than T2, which is greater than T1.

[0089] As an optional implementation of the above embodiments, as shown in Figure 5 controlling the opening of the enthalpy increasing valve includes:

[0090] S210, obtaining an outdoor environment temperature and / or an inlet water temperature;

[0091] S220, determining an initial opening degree of the enthalpy increasing valve according to the outdoor environment temperature and / or the inlet water temperature;

[0092] S240, controlling the opening of the enthalpy increasing valve according to the initial opening degree.

[0093] In embodiments, the initial opening degree of the enthalpy increasing valve when opening is determined according to different outdoor environment temperatures and / or different inlet water temperatures, so that the refrigerant can quickly increase the enthalpy stage according to the working condition, improve the enthalpy efficiency to meet the current heating demand as soon as possible.

[0094] In some embodiments, when the air source heat pump enters the enthalpy increasing stage, the opening degree of the enthalpy increasing valve is first opened to the initial opening degree, and after running for a certain duration, the outlet temperature and the inlet temperature of the heat absorption structure are collected, and then the opening degree of the enthalpy increasing valve is adjusted according to the difference between the outlet temperature and the inlet temperature.

[0095] In embodiments, the water inlet temperature and / or the outdoor ambient temperature is provided with a corresponding relationship with the opening degree adjustment value, and the air source heat pump determines the initial opening degree according to the corresponding relationship and the obtained water inlet temperature and / or the outdoor ambient temperature.

[0096] As an optional implementation of the above embodiments, as shown in Figure 6 Before the opening degree of the enthalpy increasing valve is controlled according to the initial opening degree, the enthalpy increasing control method comprises:

[0097] S230, controlling the enthalpy increasing valve to open at a first set opening degree;

[0098] S240, after the enthalpy increasing valve opens at the first set opening degree for a third preset time length, controlling the enthalpy increasing valve to open according to the initial opening degree.

[0099] In some embodiments, in order to reduce the impact of suddenly opening the enthalpy increasing valve on the system, before adjusting the enthalpy increasing valve to the initial opening degree, the enthalpy increasing valve is first adjusted to a first set opening degree and runs for a third preset time length, so that the entire system adapts to the opening of the enthalpy increasing valve; and then the opening degree of the enthalpy increasing valve is adjusted to the initial opening degree for running. The first set opening degree and the third preset time length are preset parameters, which can be factory parameters.

[0100] In the technical solutions of the above embodiments, the enthalpy increasing valve has a maximum opening degree and a minimum opening degree, that is, the opening degree of the enthalpy increasing valve is adjusted to at most the maximum opening degree and at least the minimum opening degree; when the required opening degree needs to be adjusted to more than the maximum opening degree or less than the minimum opening degree, the enthalpy increasing valve runs at the maximum opening degree or the minimum opening degree. In some embodiments, the first set opening degree is the minimum opening degree.

[0101] Of course, in some embodiments, every fifth preset time length, it is judged whether the opening degree of the enthalpy increasing valve needs to be adjusted: every fifth preset time length, the opening degree adjustment value is determined according to the interpolation of the outlet temperature and the inlet temperature, and the opening degree of the enthalpy increasing valve is adjusted according to the opening degree adjustment value. The opening degree of the enthalpy increasing valve ranges between the maximum opening degree and the minimum opening degree.

[0102] As an optional implementation of the above embodiments, as shown in Figure 7 After the opening of the enthalpy increasing valve is controlled, the control method further comprises:

[0103] S600, judging whether the operating condition of the air source heat pump meets a preset exit condition for exiting the enthalpy increasing stage; the preset exit condition comprises: the air source heat pump receives a shutdown instruction, a refrigerant recovery instruction or a defrosting instruction; or the operating frequency of the compressor is less than a first preset frequency; or the outdoor ambient temperature is greater than a second preset temperature;

[0104] S700, if yes, controlling the enthalpy increasing valve to close.

[0105] In embodiments, when the enthalpy increasing valve is opened, when the working condition of the air source heat pump meets one of the following conditions, the enthalpy increasing stage is exited: the air source heat pump receives a shutdown instruction, a refrigerant recovery instruction or a defrosting instruction; or the operating frequency of the compressor is less than the first preset frequency; or the outdoor environment temperature is greater than the second preset temperature. After determining that the air source heat pump exits the enthalpy increasing stage, the enthalpy increasing valve is closed, and the refrigerant in the first refrigerant pipe can only flow between the indoor heat exchanger and the outdoor heat exchanger.

[0106] In some embodiments, in order to reduce the impact of suddenly closing the enthalpy increasing valve on the system, the enthalpy increasing valve can be closed in the following manner: the enthalpy increasing valve is controlled to adjust to a second set opening degree, and the enthalpy increasing valve is closed after running for a fourth preset time length. The second set opening degree and the fourth preset time length are preset parameters, which can be factory parameters. Generally, the second set opening degree is the minimum opening degree.

[0107] Embodiments of the present application also provide an enthalpy increasing control system, comprising: one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the enthalpy increasing control method as described above.

[0108] Generally, the enthalpy increasing control system generally comprises at least one processor, at least one memory, and a control program of the enthalpy increasing control system stored on the memory and executable on the processor, and the control program of the enthalpy increasing control system is configured to implement the steps of the control method as described above.

[0109] The processor can include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor can be implemented in at least one of a hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), a PLA (Programmable Logic Array). The processor can also include a main processor and a coprocessor, the main processor being a processor for processing data in an awake state, also known as a CPU (Central Processing Unit); the coprocessor being a low-power processor for processing data in a standby state. In some embodiments, the processor can be integrated with a GPU (Graphics Processing Unit) that is responsible for rendering and drawing the content required to be displayed by the display screen. The processor can also include an AI (Artificial Intelligence) processor for processing control method operations related to the enthalpy control system, so that the control method model of the enthalpy control system can be autonomously trained and learned to improve efficiency and accuracy.

[0110] The memory can include one or more computer-readable storage media, which can be non-transitory. The memory can also include a high-speed random access memory, and a non-volatile memory such as one or more disk storage devices, flash storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction for being executed by the processor to implement the enthalpy control method of the enthalpy control system provided by the method embodiments in the present application:

[0111] determining whether the operation of the air source heat pump meets a preset entering condition for entering an enthalpy increasing stage;

[0112] If yes, the enthalpy increasing valve is controlled to be opened to allow the refrigerant in the first refrigerant pipe to enter the heat absorption structure through the second refrigerant pipe, so that the refrigerant entering the heat absorption structure absorbs the waste heat of the compressor and then enters the compressor.

[0113] Optionally, after the control of the enthalpy increasing valve is opened, the control method further includes:

[0114] obtaining an outlet temperature of the heat absorption structure and an inlet temperature of the heat absorption structure;

[0115] determining an opening adjustment value of the enthalpy increasing valve and an adjustment time length of the enthalpy increasing valve according to a difference between the outlet temperature and the inlet temperature.

[0116] adjusting the opening of the enthalpy increasing valve according to the opening adjustment value, and after the adjustment duration, reacquiring the outlet temperature of the heat absorption structure and the inlet temperature of the heat absorption structure.

[0117] Optionally, determining the opening adjustment value of the enthalpy increasing valve according to the difference between the outlet temperature and the inlet temperature comprises:

[0118] if the difference is less than a first preset value, the opening adjustment value is a negative value;

[0119] if the difference is greater than a second preset value, the opening adjustment value is a positive value;

[0120] if the difference is between the first preset value and the second preset value, the opening adjustment value is 0.

[0121] Optionally, the control of the opening of the enthalpy increasing valve comprises:

[0122] acquiring an outdoor environment temperature and / or an inlet water temperature;

[0123] determining an initial opening of the enthalpy increasing valve according to the outdoor environment temperature and / or the inlet water temperature;

[0124] controlling the opening of the enthalpy increasing valve according to the initial opening.

[0125] Optionally, before the control of the opening of the enthalpy increasing valve according to the initial opening, the enthalpy control method comprises:

[0126] controlling the opening of the enthalpy increasing valve at a first set opening;

[0127] after the enthalpy increasing valve is opened at the first set opening for a third preset duration, controlling the opening of the enthalpy increasing valve according to the initial opening.

[0128] Optionally, after the control of the opening of the enthalpy increasing valve, the control method further comprises:

[0129] judging whether the operating condition of the air source heat pump meets a preset exit condition for exiting the enthalpy increasing stage; the preset exit condition comprises: the air source heat pump receives a shutdown instruction, a refrigerant recovery instruction or a defrosting instruction; or the operating frequency of the compressor is less than a first preset frequency; or the outdoor environment temperature is greater than a second preset temperature;

[0130] if yes, controlling the closing of the enthalpy increasing valve.

[0131] The above merely describes optional embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure transformation made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. An air source heat pump, characterized in that, The air source heat pump includes: A refrigerant circulation system, the refrigerant circulation system including a compressor, an indoor heat exchanger and an outdoor heat exchanger connected to the compressor, and a first refrigerant pipe connecting the indoor heat exchanger and the outdoor heat exchanger; An enthalpy-increasing assembly includes a second refrigerant pipe, a heat-absorbing structure, and an enthalpy-increasing valve. The heat-absorbing structure is configured to absorb waste heat from the compressor. The outlet of the heat-absorbing structure is connected to the enthalpy-increasing port of the compressor, and the inlet of the heat-absorbing structure is connected to the first refrigerant pipe through the second refrigerant pipe. The enthalpy-increasing valve is provided on the second refrigerant pipe. The enthalpy-increasing valve is configured to open when the air source heat pump is operating under preset entry conditions for entering the enthalpy-increasing stage, so as to allow the refrigerant in the first refrigerant pipe to enter the heat-absorbing structure through the second refrigerant pipe, so that the refrigerant entering the heat-absorbing structure absorbs the waste heat of the compressor and then enters the compressor.

2. The air source heat pump as described in claim 1, characterized in that, The air source heat pump also includes: A first temperature detection device is configured to collect the outlet temperature of the heat absorption structure; The second temperature detection device is configured to collect the inlet temperature of the heat-absorbing structure. The difference between the outlet temperature and the inlet temperature is used to determine the opening adjustment value of the enthalpy-increasing valve.

3. The air source heat pump as described in claim 1, characterized in that, The air source heat pump also includes: A third temperature detection device is configured to collect outdoor ambient temperature; and / or The fourth temperature detection device is configured to collect the inlet water temperature of the indoor heat exchanger; The outdoor ambient temperature and / or the inlet water temperature are used to determine the initial opening degree of the enthalpy-increasing valve.

4. The air source heat pump as described in claim 1, characterized in that, The preset entry conditions include: The air source heat pump operates in heating mode; The operating frequency of the compressor is greater than the first preset frequency; The operating time of the compressor is longer than the first preset time. The compressor's exhaust temperature is higher than a first preset temperature and remains higher for a second preset duration. The outdoor ambient temperature is lower than the second preset temperature.

5. A method for controlling enthalpy increase, characterized in that, The control method, applied to the air source heat pump according to any one of claims 1 to 4, comprises: Determine whether the operation of the air source heat pump meets the preset entry conditions for entering the enthalpy increase stage; If so, the enthalpy-increasing valve is opened to allow the refrigerant in the first refrigerant pipe to enter the heat-absorbing structure through the second refrigerant pipe, so that the refrigerant entering the heat-absorbing structure absorbs the waste heat of the compressor and then enters the compressor.

6. The enthalpy increase control method as described in claim 5, characterized in that, After the enthalpy-increasing valve is opened, the control method further includes: Obtain the outlet temperature and the inlet temperature of the heat absorption structure; Based on the difference between the outlet temperature and the inlet temperature, determine the opening adjustment value of the enthalpy-increasing valve and the adjustment duration of the enthalpy-increasing valve; Adjust the opening degree of the enthalpy-increasing valve according to the opening degree adjustment value; After the adjustment period, the outlet temperature and inlet temperature of the heat absorption structure are reacquired.

7. The enthalpy increase control method as described in claim 6, characterized in that, The opening adjustment value of the enthalpy-increasing valve is determined based on the difference between the outlet temperature and the inlet temperature, including: If the difference is less than the first preset value, then the opening adjustment value is negative; If the difference is greater than the second preset value, then the opening adjustment value is positive; If the difference is between the first preset value and the second preset value, then the opening adjustment value is 0.

8. The enthalpy increase control method as described in claim 5, characterized in that, The control of opening the enthalpy-increasing valve includes: Obtain the outdoor ambient temperature and / or the inlet water temperature; The initial opening degree of the enthalpy-increasing valve is determined based on the outdoor ambient temperature and / or the inlet water temperature. The enthalpy-increasing valve is opened according to the initial opening degree.

9. The enthalpy increase control method as described in claim 8, characterized in that, Before controlling the enthalpy-increasing valve to open according to the initial opening degree, the enthalpy-increasing control method includes: The enthalpy-increasing valve is controlled to open at a first set opening degree; After the enthalpy-increasing valve has been open for a third preset time at the first set opening degree, the enthalpy-increasing valve is controlled to open according to the initial opening degree.

10. The enthalpy increase control method as described in claim 5, characterized in that, After the enthalpy-increasing valve is opened, the control method further includes: Determine whether the operating conditions of the air source heat pump meet the preset exit conditions for exiting the enthalpy increase stage; the preset exit conditions include: the air source heat pump receiving a shutdown command, a refrigerant recovery command, or a defrost command; or the operating frequency of the compressor is less than a first preset frequency; or the outdoor ambient temperature is greater than a second preset temperature; If so, then the enthalpy-increasing valve is closed.

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