Air source heat pump unit control method and device, medium and air source heat pump unit

Abstract

The invention discloses an air source heat pump unit control method and device, a medium and an air source heat pump unit, and relates to the technical field of heat pumps, the method comprises the steps that in a defrosting mode, high pressure is received; determining whether the high pressure is greater than or equal to a first preset pressure and lasts for a first preset duration; and if the high pressure is larger than or equal to the first preset pressure and lasts for a first preset duration, a first quit operation is executed to quit the defrosting mode. According to the air source heat pump unit, invalid defrosting under the frost-free / less-frost condition can be avoided, shutdown protection is prevented from being triggered, the operation stability of the air source heat pump unit is improved, energy consumption is reduced, and user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pumps, and in particular to a control method, device, medium and air source heat pump unit. Background Art

[0002] Air-source heat pumps are increasingly used, generating heat by absorbing heat from the air. However, in low ambient temperatures, frost easily forms on the finned heat exchangers in these units, reducing heating efficiency. To prevent frost from affecting heating performance, air-source heat pumps typically implement defrost control according to established logic.

[0003] When defrosting control is performed according to the current established logic, defrosting operation is often continued in the no-frost / little-frost condition, and then ineffective defrosting occurs. In the ineffective defrosting condition, due to the lack of frost layer as a cold source conduction, the high-temperature gaseous refrigerant cannot be effectively condensed in the fin heat exchanger, which will cause the refrigerant pressure to increase, thereby triggering frequent shutdown protection, resulting in poor operating stability of the air source heat pump unit, and ineffective defrosting will waste energy. Summary of the Invention

[0004] The embodiment of the present application provides a solution that can avoid ineffective defrosting in no-frost / little-frost conditions, improve the operating stability of the air source heat pump unit, reduce energy consumption, and enhance user experience.

[0005] The embodiments of this application provide the following technical solutions:

[0006] According to one embodiment of the present application, a method for controlling an air source heat pump unit includes: receiving high-pressure pressure in a defrost mode; determining whether the high-pressure pressure is greater than or equal to a first preset pressure and lasts for a first preset time; if the high-pressure pressure is greater than or equal to the first preset pressure and lasts for the first preset time, executing a first exit operation to exit the defrost mode.

[0007] In some embodiments of the present application, executing the first exit operation includes: controlling the compressor to keep running and turning on the fan; after turning on the fan, controlling the four-way valve to switch to the heating direction according to the high pressure.

[0008] In some embodiments of the present application, controlling the four-way valve to switch to the heating direction according to the high-pressure pressure includes: determining whether the high-pressure pressure is less than or equal to a second preset pressure and lasts for a second preset time; if the high-pressure pressure is less than or equal to the second preset pressure and lasts for the second preset time, controlling the four-way valve to switch to the heating direction.

[0009] In some embodiments of the present application, after entering the defrost mode, the method further includes: receiving defrost status data, the defrost status data including at least one of the heat exchanger temperature and the defrost operation duration; if the defrost status data meets the preset exit conditions, performing a second exit operation to exit the defrost mode.

[0010] In some embodiments of the present application, executing the second exit operation includes: controlling the compressor to keep running and controlling the four-way valve to switch to the heating direction; after the four-way valve is switched to the heating direction, turning on the fan.

[0011] In some embodiments of the present application, after entering the defrost mode, the method further includes: controlling the compressor to keep running, switching the four-way valve to the cooling direction, and turning off the fan.

[0012] In some embodiments of the present application, before receiving the high pressure in the defrost mode, the method further includes: receiving a frost judgment parameter, the frost judgment parameter including one or more of the ambient temperature, the heat exchanger temperature and the ambient humidity; if the frost judgment parameter meets the preset defrost condition, switching from the heating mode to the defrost mode.

[0013] According to one embodiment of the present application, an air source heat pump unit control device includes: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the method described in the embodiment of the present application.

[0014] According to another embodiment of the present application, a storage medium stores a computer program thereon. When the computer program is executed by a processor of an air source heat pump unit control device, the air source heat pump unit control device executes the method described in the embodiment of the present application.

[0015] According to another embodiment of the present application, an air source heat pump unit may include the air source heat pump unit control device as described in the embodiment of the present application.

[0016] According to another embodiment of the present application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an air-source heat pump unit control device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the air-source heat pump unit control device to perform the methods provided in various optional implementations described in the embodiments of the present application.

[0017] In an embodiment of the present application, in the defrost mode, high pressure is received; it is determined whether the high pressure is greater than or equal to a first preset pressure and lasts for a first preset time; if the high pressure is greater than or equal to the first preset pressure and lasts for the first preset time, a first exit operation is performed to exit the defrost mode.

[0018] In this manner of the embodiment of the present application, by introducing high-pressure pressure monitoring as the key exit condition of the defrost mode, when the high-pressure pressure is greater than or equal to the first preset pressure and lasts for a first preset time, it is judged that the air source heat pump unit will perform ineffective defrosting in the no-frost / little-frost situation, which will cause the refrigerant pressure to increase and trigger the shutdown protection. At this time, the first exit operation is executed to exit the defrost mode, thereby avoiding ineffective defrosting in the no-frost / little-frost situation, avoiding triggering the shutdown protection, improving the operating stability of the air source heat pump unit, reducing energy consumption, and improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A flow chart of a method for controlling an air source heat pump unit according to an embodiment of the present application is shown.

[0021] Figure 2 A defrost mode exit flowchart according to one embodiment of the present application is shown.

[0022] Figure 3 A defrost mode exit flowchart according to another embodiment of the present application is shown.

[0023] Figure 4 A block diagram of an air source heat pump unit control device according to an embodiment of the present application is shown.

[0024] Figure 5 A block diagram of an air source heat pump unit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the examples provided herein are merely for explaining the present disclosure and are not intended to limit the present disclosure. In addition, the examples provided below are partial examples for implementing the present disclosure, rather than providing all examples for implementing the present disclosure. In the absence of conflict, the technical solutions described in the examples of the present disclosure may be implemented in any combination.

[0026] It should be noted that, in the embodiments of the present disclosure, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a method or apparatus comprising a series of elements includes not only the elements explicitly stated, but also other elements not explicitly listed, or also includes elements inherent to the implementation of the method or apparatus. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other related elements (such as steps in the method or units in the apparatus, for example, a unit may be part of a circuit, part of a processor, part of a program or software, etc.) in the method or apparatus comprising the element.

[0027] For example, the air source heat pump unit control method provided in the embodiment of the present disclosure includes a series of steps, but the air source heat pump unit control method provided in the embodiment of the present disclosure is not limited to the recorded steps. Similarly, the air source heat pump unit control device provided in the embodiment of the present disclosure includes a series of units, but the device provided in the embodiment of the present disclosure is not limited to including the units explicitly recorded, and may also include units that need to be set up to obtain relevant information or perform processing based on information.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure.

[0029] It is understandable that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards.

[0030] Air-source heat pumps are increasingly used, generating heat by absorbing heat from the air. However, in low ambient temperatures, frost easily forms on the finned heat exchangers in these units, reducing heating efficiency. To prevent frost from affecting heating performance, air-source heat pumps typically implement defrost control according to established logic.

[0031] When defrosting control is performed according to the current established logic, defrosting operation is often continued in the no-frost / little-frost condition, and then ineffective defrosting occurs. In the ineffective defrosting condition, due to the lack of frost layer as a cold source conduction, the high-temperature gaseous refrigerant cannot be effectively condensed in the fin heat exchanger, which will cause the refrigerant pressure to increase, thereby triggering frequent shutdown protection, resulting in poor operating stability of the air source heat pump unit, and ineffective defrosting will waste energy.

[0032] In order to solve these temperature problems, this application provides the following air source heat pump unit control solution, which can avoid ineffective defrosting in no frost / little frost conditions, avoid triggering shutdown protection, improve the operating stability of the air source heat pump unit and reduce energy consumption, thereby improving user experience.

[0033] The following describes in detail the various embodiments of the air source heat pump unit control solution provided in this application.

[0034] first, Figure 1 A flowchart schematically illustrates a method for controlling an air-source heat pump unit according to one embodiment of the present application. The method can be executed by an air-source heat pump unit control device with processing capabilities. The air-source heat pump unit control device can be installed in devices such as the air-source heat pump unit, a mobile phone, a computer, a smartwatch, or other household appliances. The air-source heat pump unit control device may include at least a memory and a processor.

[0035] In a specific embodiment of the present application, an air source heat pump unit control device serving as the executor of the air source heat pump unit control method is specifically arranged in the air source heat pump unit. The air source heat pump unit control device may include a processor and a memory. The memory stores a computer program. The processor can read the computer program stored in the memory to execute the methods of each embodiment of the present application.

[0036] like Figure 1 As shown, the air source heat pump unit control method may include steps S110 to S130. The air source heat pump unit may include at least a compressor, a fan, a four-way valve, and a fin heat exchanger. A high-pressure sensor may be provided on the exhaust side of the compressor to monitor the high-pressure pressure in the air source heat pump unit.

[0037] Step S110, receiving high pressure in defrost mode;

[0038] Step S120, determining whether the high pressure is greater than or equal to a first preset pressure and lasts for a first preset time period;

[0039] In step S130 , if the high pressure is greater than or equal to the first preset pressure and lasts for a first preset time, a first exit operation is performed to exit the defrost mode.

[0040] During heating operation, the air source heat pump unit switches from heating mode to defrost mode if the preset defrost conditions are met. In defrost mode, the high-pressure sensor installed on the exhaust side of the compressor can detect the high-pressure pressure in the air source heat pump unit in real time.

[0041] For the detected high pressure, it can be continuously determined whether the detected high pressure is "greater than or equal to a first preset pressure" and "continues to be greater than or equal to the first preset pressure for a first preset time period." When the high pressure Pc is greater than or equal to the first preset pressure Pc1 and continues for a first preset time period T1 (i.e., Pc ≥ Pc1 and continues for T1), a first exit operation is executed to forcibly exit the defrost mode and then return to the heating mode.

[0042] In this manner of the embodiment of the present application, by introducing high-pressure pressure monitoring as the key exit condition of the defrost mode, when the high-pressure pressure is greater than or equal to the first preset pressure and lasts for a first preset time, it is judged that the air source heat pump unit will perform ineffective defrosting in the no-frost / little-frost situation, which will cause the refrigerant pressure to increase and trigger the shutdown protection. At this time, the first exit operation is executed to exit the defrost mode, thereby avoiding ineffective defrosting in the no-frost / little-frost situation, avoiding triggering the shutdown protection, improving the operating stability of the air source heat pump unit, reducing energy consumption, and improving user experience.

[0043] Further, the following describes Figure 1 When controlling the air source heat pump unit under the embodiment, further optional specific embodiments are provided for each step performed.

[0044] In one embodiment, before step S110 "receiving high pressure in defrost mode", the air source heat pump unit control method may also include: receiving frost judgment parameters, the frost judgment parameters including one or more of ambient temperature, heat exchanger temperature and ambient humidity; if the frost judgment parameters meet the preset defrost conditions, switching from heating mode to defrost mode.

[0045] That is, when the air source heat pump unit is in heating mode before entering defrost mode, it can receive frost judgment parameters in real time. The frost judgment parameters may include one or more of ambient temperature, heat exchanger temperature and ambient humidity. When it is determined that the frost judgment parameters meet the preset defrost conditions, the air source heat pump unit is switched from heating mode to defrost mode.

[0046] The ambient temperature is the temperature of the environment in which the air source heat pump unit is located; the heat exchanger temperature is the temperature of the fin heat exchanger in the air source heat pump unit; and the ambient humidity is the humidity of the environment in which the air source heat pump unit is located. The ambient temperature, heat exchanger temperature, and ambient humidity can be detected by pre-installed temperature and humidity sensors.

[0047] The frost judgment parameters that meet the preset defrost conditions can be set according to actual conditions. For example, when the fin temperature is ≤ the set threshold and the operating time of the air source heat pump unit reaches the predetermined time, it is determined that the preset defrost conditions are met; or, when the ambient temperature is ≤ the predetermined temperature and the fin temperature is ≤ the set threshold, it is determined that the preset defrost conditions are met; or, when the ambient temperature is ≤ the predetermined temperature, the fin temperature is ≤ the set threshold and the ambient humidity is ≥ the predetermined humidity, it is determined that the preset defrost conditions are met.

[0048] In one embodiment, after entering the defrost mode, the air source heat pump unit control method may further include: controlling the compressor to keep running, switching the four-way valve to the cooling direction, and turning off the fan.

[0049] That is, after the air source heat pump unit enters the defrost mode, the air source heat pump unit switches to refrigeration operation in the defrost mode. The refrigeration operation specifically includes "the compressor keeps running (providing high-temperature refrigerant), the four-way valve switches to the refrigeration direction (allowing high-temperature refrigerant to flow to the fin heat exchanger), and the fan is turned off (to avoid air convection affecting the defrost effect)". Then the high-temperature refrigerant in the air source heat pump unit will flow into the fin heat exchanger to melt the frost layer on the fin heat exchanger.

[0050] See Figure 2 In one embodiment, in step S130, a first exit operation is performed, which may specifically include: step S210, controlling the compressor to keep running and turning on the fan; step S220, after turning on the fan, controlling the four-way valve to switch to the heating direction according to the high pressure.

[0051] In the defrost mode, "the compressor keeps running, the four-way valve switches to the cooling direction, and the fan is turned off." In the first case where the high pressure is greater than or equal to the first preset pressure and lasts for a first preset time, a first exit operation is performed to forcibly exit the defrost mode.

[0052] In this embodiment, the first exit operation specifically includes controlling the compressor to maintain operation and turning on the fan. After turning on the fan, the four-way valve is controlled to switch to the heating mode based on the high-pressure pressure. In this way, early activation of the fan accelerates heat dissipation through forced convection, thereby accelerating the reduction of the high-pressure pressure and further preventing the triggering of the shutdown protection. Subsequently, the four-way valve is controlled to switch to the heating mode based on the high-pressure pressure, reliably resuming the heating mode and completing the exit from the defrost mode.

[0053] Furthermore, in one embodiment, controlling the four-way valve to switch to the heating direction according to the high-pressure pressure may include: determining whether the high-pressure pressure is less than or equal to a second preset pressure and lasts for a second preset time; if the high-pressure pressure is less than or equal to the second preset pressure and lasts for the second preset time, controlling the four-way valve to switch to the heating direction.

[0054] After turning on the fan, when it is determined that the high-pressure pressure Pc is less than or equal to the second preset pressure Pc2 and lasts for the second preset time T2 (that is, Pc≤Pc2 and lasts for T2), the four-way valve is controlled to switch to the heating direction. This can avoid forced reversing under high-pressure conditions, avoid valve damage caused by high-pressure shock, reduce mechanical losses, and thus improve the life of the four-way valve.

[0055] See Figure 3 In one embodiment, after entering the defrost mode, the air source heat pump unit control method may further include: step S310, receiving defrost status data, the defrost status data including at least one of the heat exchanger temperature and the defrost operation time; step S320, if the defrost status data meets the preset exit condition, executing the second exit operation to exit the defrost mode.

[0056] The heat exchanger temperature is the temperature of the fin heat exchanger, and the defrost operation duration is the duration of continuous operation in the defrost mode after entering the defrost mode. After entering the defrost mode, defrost status data can be received in real time, and the defrost status data includes at least one of the heat exchanger temperature and the defrost operation duration.

[0057] If the defrost status data meets the preset exit conditions (for example, the heat exchanger temperature T3 ≥ the preset exit temperature t1°C or the defrost operation time T 除霜 ≥Preset running time t min ), indicating that the air source heat pump unit has completed defrosting under normal frosting conditions. At this time, execute the second exit operation to directly exit the defrost mode.

[0058] Furthermore, in one embodiment, executing the second exit operation may specifically include: controlling the compressor to remain running and controlling the four-way valve to switch to the heating direction; after the four-way valve is switched to the heating direction, turning on the fan. In this way, by controlling the compressor to remain running, controlling the four-way valve to switch to the heating direction, and turning on the fan, the air source heat pump unit can be restored to the heating mode.

[0059] In addition, the embodiment of the present application also provides an air source heat pump unit control device. Figure 4 As shown, Figure 4 A block diagram of an air source heat pump unit control device according to an embodiment of the present application is shown. Specifically, the air source heat pump unit control device 400 may include a processor 401 with one or more processing cores and a memory 402 with one or more computer-readable storage media.

[0060] The processor 401 can load the executable files corresponding to the processes of one or more computer programs into the memory 402 according to the instructions, and the processor 401 can run the computer programs stored in the memory 402, thereby realizing the various functions in the embodiments of the aforementioned air source heat pump unit control method of this application.

[0061] For example, the processor 401 can execute: in the defrost mode, receiving high-pressure pressure; determining whether the high-pressure pressure is greater than or equal to a first preset pressure and lasts for a first preset time; if the high-pressure pressure is greater than or equal to the first preset pressure and lasts for the first preset time, executing a first exit operation to exit the defrost mode.

[0062] In some embodiments of the present application, executing the first exit operation includes: controlling the compressor to keep running and turning on the fan; after turning on the fan, controlling the four-way valve to switch to the heating direction according to the high pressure.

[0063] In some embodiments of the present application, controlling the four-way valve to switch to the heating direction according to the high-pressure pressure includes: determining whether the high-pressure pressure is less than or equal to a second preset pressure and lasts for a second preset time; if the high-pressure pressure is less than or equal to the second preset pressure and lasts for the second preset time, controlling the four-way valve to switch to the heating direction.

[0064] In some embodiments of the present application, after entering the defrost mode, it may also include: receiving defrost status data, the defrost status data including at least one of the heat exchanger temperature and the defrost operation duration; if the defrost status data meets the preset exit conditions, executing a second exit operation to exit the defrost mode.

[0065] In some embodiments of the present application, executing the second exit operation includes: controlling the compressor to keep running and controlling the four-way valve to switch to the heating direction; after the four-way valve is switched to the heating direction, turning on the fan.

[0066] In some embodiments of the present application, after entering the defrost mode, the following steps may also be included: controlling the compressor to keep running, switching the four-way valve to the cooling direction, and turning off the fan.

[0067] In some embodiments of the present application, before receiving the high pressure in the defrost mode, it may also include: receiving a frost judgment parameter, the frost judgment parameter including one or more of the ambient temperature, the heat exchanger temperature and the ambient humidity; if the frost judgment parameter meets the preset defrost condition, switching from the heating mode to the defrost mode.

[0068] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be accomplished by a computer program, or by controlling related hardware through a computer program. The computer program may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0069] To this end, an embodiment of the present application further provides a storage medium storing a computer program, which can be loaded by a processor to execute the steps of any method provided in the embodiment of the present application.

[0070] The storage medium may be a computer-readable storage medium, and the storage medium may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0071] Since the computer program stored in the storage medium can execute the steps of any method provided in the embodiments of the present application, the beneficial effects that can be achieved by the method provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0072] In addition, see Figure 5 The embodiment of the present application further provides an air source heat pump unit, the air source heat pump unit 500 may include Figure 4 The air source heat pump unit control device 400 and other modules 600 (such as a compressor, a fan, a fin heat exchanger and a four-way valve, etc.) are shown.

[0073] According to another embodiment of the present application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an air-source heat pump unit control device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the air-source heat pump unit control device to perform the methods provided in various optional implementations described in the embodiments of the present application.

[0074] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0075] It should be understood that the present application is not limited to the embodiments that have been described above and shown in the accompanying drawings, but various modifications and changes may be made without departing from the scope thereof.

Claims

1. A method for controlling an air source heat pump unit, characterized in that: include: In defrost mode, high pressure is received; Determining whether the high pressure is greater than or equal to a first preset pressure and lasts for a first preset time period; If the high pressure is greater than or equal to the first preset pressure and lasts for the first preset time, a first exit operation is performed to exit the defrost mode.

2. The method according to claim 1, characterized in that The performing of the first exit operation includes: Control the compressor to keep running and turn on the fan; After the fan is turned on, the four-way valve is controlled to switch to the heating direction according to the high pressure.

3. The method according to claim 2, characterized in that The controlling the four-way valve to switch to the heating direction according to the high pressure pressure includes: Determining whether the high pressure is less than or equal to a second preset pressure and lasts for a second preset time period; If the high pressure is less than or equal to the second preset pressure and lasts for the second preset time, the four-way valve is controlled to switch to the heating direction.

4. The method according to claim 1, wherein After entering the defrost mode, the method further includes: receiving defrost status data, the defrost status data including at least one of a heat exchanger temperature and a defrost operation duration; If the defrost state data meets a preset exit condition, a second exit operation is performed to exit the defrost mode.

5. The method according to claim 4, characterized in that The performing of the second exit operation includes: Control the compressor to keep running and control the four-way valve to switch to the heating direction; After the four-way valve is switched to the heating direction, the fan is turned on.

6. The method according to any one of claims 1 to 5, characterized in that After entering the defrost mode, the method further includes: Control the compressor to keep running, switch the four-way valve to the cooling direction, and turn off the fan.

7. The method according to any one of claims 1 to 5, characterized in that Before receiving the high pressure in the defrost mode, the method further includes: receiving a frost determination parameter, wherein the frost determination parameter includes one or more of an ambient temperature, a heat exchanger temperature, and an ambient humidity; If the frosting judgment parameter meets the preset defrosting condition, the heating mode is switched to the defrosting mode.

8. An air source heat pump unit control device, characterized in that: include: a memory storing a computer program; A processor reads a computer program stored in a memory to execute the method according to any one of claims 1 to 7.

9. A storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor of the air source heat pump unit control device, the air source heat pump unit control device executes the method according to any one of claims 1 to 7.

10. An air source heat pump unit, characterized in that: It includes the air source heat pump unit control device as described in claim 8.

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