Control method and device of heat pump unit with enthalpy increasing valve, computer equipment

Abstract

The application relates to a control method and device of a heat pump unit with an enthalpy increasing valve, computer equipment, a storage medium and a computer program product. The control method of the heat pump unit with the enthalpy increasing valve comprises the following steps: detecting an exhaust temperature; if the exhaust temperature is greater than or equal to a preset threshold value, maintaining an unchanged operating frequency and adjusting the enthalpy increasing valve to 70% of a total opening degree. The application introduces the exhaust frequency limiting and non-frequency reducing logic and the adjustment of the opening degree of the enthalpy increasing valve, so that the exhaust can be controlled in a short time, long-time operation of the unit at a low frequency is avoided, and the unit capacity is maximized.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a control method, apparatus, computer equipment, storage medium, and computer program product for a heat pump unit with an enthalpy-increasing valve. Background Technology

[0002] Heat pump water heating technology is a hot water supply method based on heat pump technology. Due to its advantages such as energy saving, environmental protection, and energy conservation, it has a promising future. Because of the latent heat property of R32 refrigerant, heat pump units using R32 refrigerant have higher energy efficiency under the same conditions and are widely used.

[0003] Reference Figure 1 As shown, in the existing heat pump unit, liquid refrigerant flows out from the lower outlet of plate heat exchanger 1'. Part of the liquid refrigerant enters the main refrigerant path through the second outlet of the first three-way connector 2' and flows to the finned heat exchanger 5'. Part of the liquid refrigerant flows into the auxiliary refrigerant path through the first outlet of the first three-way connector 2' and flows to the gas injection port of compressor 4' through the enthalpy-increasing valve 3'.

[0004] For heat pump units using R32 refrigerant, excessively rapid exhaust gas flow often causes the unit to reduce its operating frequency, resulting in a gradual decrease in the circulation volume through the enthalpy-increasing valve. At this point, even increasing the valve opening is insufficient to stabilize the exhaust gas flow, leading to prolonged low-frequency operation and impacting the unit's performance. Summary of the Invention

[0005] Therefore, it is necessary to provide a control method, device, computer equipment, computer-readable storage medium, and computer program product for a heat pump unit with an enthalpy-increasing valve to address the above-mentioned technical problems.

[0006] In a first aspect, a control method for a heat pump unit with an enthalpy-increasing valve is provided, the method comprising:

[0007] Detect exhaust temperature;

[0008] If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency unchanged and increase the enthalpy valve to 70% of its total opening.

[0009] In one embodiment, the method further includes:

[0010] Adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0011] In one embodiment, adjusting the opening of the enthalpy-increasing valve according to the exhaust superheat includes:

[0012] Detect exhaust superheat;

[0013] If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps;

[0014] If the exhaust superheat decreases, the opening of the enthalpy-increasing valve remains unchanged.

[0015] In one embodiment, the method further includes:

[0016] If the exhaust temperature is less than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

[0017] In one embodiment, adjusting the opening of the enthalpy-increasing valve to its initial opening includes:

[0018] The opening of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until it reaches the initial opening.

[0019] In one embodiment, the initial opening degree is the opening degree when the enthalpy-increasing valve is opened.

[0020] Secondly, a control device for a heat pump unit with an enthalpy-increasing valve is provided, the device comprising:

[0021] Temperature detection module, used to detect exhaust temperature;

[0022] The frequency limiting module is used to maintain the operating frequency unchanged and increase the enthalpy valve to 70% of its total opening if the exhaust temperature is greater than or equal to a preset threshold.

[0023] Thirdly, a computer device is provided, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of any of the preceding methods.

[0024] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0025] Fifthly, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0026] The aforementioned control method, device, computer equipment, storage medium, and computer program product for heat pump units with enthalpy-increasing valves maintain a constant operating frequency when the exhaust temperature reaches a preset threshold, ensuring the circulation volume through the enthalpy-increasing valve. Simultaneously, the enthalpy-increasing valve is increased to 70% of its total opening, thereby enabling the exhaust to be controlled in a short time, preventing the unit from operating at low frequency for extended periods, and maximizing the unit's capacity. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the structure of an existing heat pump unit;

[0028] Figure 2 This is a schematic flowchart illustrating a control method for a heat pump unit with an enthalpy-increasing valve according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic flowchart illustrating a control method for a heat pump unit with an enthalpy-increasing valve according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic flowchart illustrating a control method for a heat pump unit with an enthalpy-increasing valve according to an embodiment of the present invention.

[0031] Figure 5 This is a block diagram of a control device for a heat pump unit with an enthalpy-increasing valve, according to an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] Existing R32 heat pump units have a rapid exhaust gas rise rate, which often causes the unit to reduce its frequency. Even with a large enough opening of the enthalpy-increasing valve, the low system circulation volume makes it impossible to control the exhaust gas in a short time, resulting in prolonged low-frequency operation and affecting the unit's capacity. In view of this, this invention introduces exhaust gas frequency limiting logic to prevent frequency reduction, along with adjustments to the enthalpy-increasing valve opening. This allows for short-term control of the exhaust gas, preventing the unit from operating at low frequencies for extended periods and maximizing the unit's capacity.

[0034] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0035] like Figure 2 As shown, an embodiment of the present invention provides a control method for a heat pump unit with an enthalpy-increasing valve, comprising the following steps:

[0036] Step S202: Detect the exhaust temperature.

[0037] Step S204: If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency unchanged and increase the enthalpy valve to 70% of the total opening.

[0038] In some embodiments, the preset threshold refers to the exhaust temperature frequency limit value, and the preset threshold is 92°C, which may vary depending on the unit.

[0039] In existing technologies, when the exhaust temperature reaches a preset threshold, the unit reduces its frequency, and the operating frequency gradually decreases. Correspondingly, the circulation volume through the enthalpy-increasing valve decreases synchronously. At this point, even if the opening of the enthalpy-increasing valve is increased, the circulation volume through it is insufficient to stabilize the exhaust. Therefore, this invention maintains a constant operating frequency when the exhaust temperature reaches the preset threshold, ensuring sufficient circulation volume through the enthalpy-increasing valve. Simultaneously, the enthalpy-increasing valve is increased to 70% of its total opening, thereby enabling rapid control of the exhaust.

[0040] In one embodiment, such as Figure 3 As shown, the control method for a heat pump unit with an enthalpy-increasing valve also includes:

[0041] Step S206: Adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0042] In some embodiments, exhaust superheat = exhaust temperature - outlet water temperature. In this invention, after opening the enthalpy-increasing valve, the opening degree of the enthalpy-increasing valve is further adjusted according to the exhaust superheat, which enables more precise control of the exhaust.

[0043] In one embodiment, adjusting the opening of the enthalpy-increasing valve according to the exhaust superheat includes:

[0044] Step S402: Detect exhaust superheat;

[0045] Step S404: If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds.

[0046] In step S406, if the exhaust superheat decreases, the opening of the enthalpy-increasing valve remains unchanged.

[0047] In some embodiments, the exhaust superheat is detected every 30 seconds. If the detected exhaust superheat is greater than the previous one, that is, the exhaust superheat has increased, the opening of the enthalpy-increasing valve is increased by 5 steps every 15 seconds; if the detected exhaust superheat is less than the previous one, that is, the exhaust superheat has decreased, the opening of the enthalpy-increasing valve remains unchanged.

[0048] In one embodiment, such as Figure 4 As shown, the control method for a heat pump unit with an enthalpy-increasing valve also includes:

[0049] Step S208: If the exhaust temperature is less than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy increase valve to the initial opening.

[0050] In some embodiments, the frequency limit recovery value is 85°C, but the specific value varies depending on the unit. When the exhaust temperature is lower than the frequency limit recovery value, it indicates that the exhaust temperature has decreased, and the unit can then increase its frequency. Specifically, different ambient temperature ranges or water temperature ranges of the heat pump unit have specific frequency requirements. For example, if the target frequency for a certain water temperature is 80Hz, and the exhaust temperature exceeds 92°C when the unit's operating frequency increases to 75Hz, the operating frequency is maintained unchanged; that is, the unit's operating frequency remains at 75Hz without increasing the frequency. By adjusting the opening of the enthalpy-increasing valve, the exhaust temperature is reduced to 85°C. The unit's operating frequency is then no longer controlled, and it will continue to increase until the target frequency of 80Hz is reached.

[0051] In some embodiments, the initial opening degree refers to the opening degree of the enthalpy-increasing valve when it is opened. Specifically, the opening degree of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until the initial opening degree is reached.

[0052] In one embodiment, the present invention provides a control method for a heat pump unit with an enthalpy-increasing valve, comprising the following steps:

[0053] Step S601: Detect the exhaust temperature.

[0054] Step S602: If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency unchanged and increase the enthalpy valve to 70% of the total opening.

[0055] Step S603: Detect exhaust superheat;

[0056] Step S604: If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds.

[0057] Step S605: If the exhaust superheat decreases, maintain the opening of the enthalpy-increasing valve unchanged;

[0058] Step S606: If the exhaust temperature is less than the frequency limit recovery value, increase the operating frequency and reduce the opening of the enthalpy increase valve by 8 steps every 30 seconds until the initial opening is reached.

[0059] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0060] Based on the same inventive concept, this application also provides a control device for implementing the control method of the heat pump unit with an enthalpy-increasing valve described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the control device for the heat pump unit with an enthalpy-increasing valve provided below can be found in the limitations of the control method above, and will not be repeated here.

[0061] In one embodiment, such as Figure 5 As shown, the present invention provides a control device for a heat pump unit with an enthalpy-increasing valve, comprising:

[0062] Temperature detection module 502 is used to detect exhaust temperature;

[0063] The frequency limiting module 504 is used to maintain the operating frequency unchanged and increase the enthalpy valve to 70% of the total opening if the exhaust temperature is greater than or equal to a preset threshold.

[0064] In one embodiment, the control device for a heat pump unit with an enthalpy-increasing valve further includes:

[0065] The enthalpy-increasing valve adjustment module 506 is used to adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0066] In one embodiment, the temperature detection module 502 is further configured to detect exhaust superheat;

[0067] The enthalpy-increasing valve adjustment module 506 is also used to increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds if the exhaust superheat increases; and to keep the opening of the enthalpy-increasing valve unchanged if the exhaust superheat decreases.

[0068] In one embodiment, the frequency limiting module 504 is further configured to, if the exhaust temperature is less than the frequency limiting recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

[0069] In one embodiment, the frequency limiting module 504 is also used to reduce the opening of the enthalpy-increasing valve by 8 steps every 30 seconds until it reaches the initial opening.

[0070] In one embodiment, the initial opening degree refers to the opening degree when the enthalpy-increasing valve is opened.

[0071] The various modules in the control device of the aforementioned heat pump unit with enthalpy-increasing valve can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0072] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0073] Detect exhaust temperature;

[0074] If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency and increase the enthalpy valve to 70% of its total opening.

[0075] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0076] Adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0077] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0078] Detect exhaust superheat;

[0079] If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds;

[0080] If the exhaust superheat decreases, maintain the opening of the enthalpy-increasing valve unchanged.

[0081] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0082] If the exhaust temperature is lower than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

[0083] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0084] The opening of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until it reaches the initial opening.

[0085] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0086] Detect exhaust temperature;

[0087] If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency and increase the enthalpy valve to 70% of its total opening.

[0088] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0089] Adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0090] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0091] Detect exhaust superheat;

[0092] If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds;

[0093] If the exhaust superheat decreases, maintain the opening of the enthalpy-increasing valve unchanged.

[0094] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0095] If the exhaust temperature is lower than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

[0096] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0097] The opening of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until it reaches the initial opening.

[0098] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0099] Detect exhaust temperature;

[0100] If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency and increase the enthalpy valve to 70% of its total opening.

[0101] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0102] Adjust the opening of the enthalpy-increasing valve according to the exhaust superheat.

[0103] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0104] Detect exhaust superheat;

[0105] If the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps every 15 seconds;

[0106] If the exhaust superheat decreases, maintain the opening of the enthalpy-increasing valve unchanged.

[0107] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0108] If the exhaust temperature is lower than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

[0109] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0110] The opening of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until it reaches the initial opening.

[0111] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a heat pump unit with an enthalpy-increasing valve, characterized in that, The method includes: Detect exhaust temperature; If the exhaust temperature is greater than or equal to the preset threshold, maintain the operating frequency unchanged, and increase the enthalpy-increasing valve to 70% of its total opening. Adjusting the opening of the enthalpy-increasing valve according to the exhaust superheat includes: Detect the exhaust superheat; if the exhaust superheat increases, increase the opening of the enthalpy-increasing valve by 5 steps; if the exhaust superheat decreases, keep the opening of the enthalpy-increasing valve unchanged. If the exhaust temperature is less than the frequency limit recovery value, increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening.

2. The method according to claim 1, characterized in that, Adjusting the opening of the enthalpy-increasing valve to its initial opening includes: The opening of the enthalpy-increasing valve is reduced by 8 steps every 30 seconds until it reaches the initial opening.

3. The method according to claim 1, characterized in that, The initial opening degree is the opening degree when the enthalpy-increasing valve is opened.

4. A control device for a heat pump unit with an enthalpy-increasing valve, characterized in that, The device includes: Temperature detection module is used to detect exhaust temperature and exhaust superheat; The frequency limiting module is used to maintain the operating frequency unchanged and increase the enthalpy-increasing valve to 70% of the total opening if the exhaust temperature is greater than or equal to a preset threshold; and to increase the operating frequency and adjust the opening of the enthalpy-increasing valve to the initial opening if the exhaust temperature is less than the frequency limiting recovery value. The enthalpy-increasing valve adjustment module is used to adjust the opening of the enthalpy-increasing valve according to the exhaust superheat, including: if the exhaust superheat increases, the opening of the enthalpy-increasing valve is increased by 5 steps; if the exhaust superheat decreases, the opening of the enthalpy-increasing valve is kept unchanged.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

Images