Defrosting control method and device, storage medium and air source heat pump system

Abstract

The invention discloses a defrosting control method and device, a storage medium and an air source heat pump system. The defrosting control method comprises the steps that whether a defrosting mode is operated or not is judged; if the judgment result is that the defrosting mode is operated, the pressure Pe of an air return port of a compressor, the temperature Te of an outdoor heat exchanger and the temperature Ts of a circulating water path are obtained, the target frequency f in the defrosting process is determined according to the Pe, the Te and the Ts, then the defrosting mode is operated, and the current operation frequency f1 of the compressor is obtained; and according to f and f1, the frequency of the compressor is gradually adjusted to f according to the corresponding frequency change rate. According to the defrosting control method, it can be guaranteed that the outdoor heat exchanger is not frozen at low temperature, it can also be guaranteed that the outdoor heat exchanger conducts defrosting rapidly and reliably, and the problems that in the defrosting process of a compressor, abnormity occurs due to too fast frequency change, and the defrosting efficiency is reduced due to too slow frequency change are solved; according to the scheme, the use comfort of the air source heat pump system can be effectively improved.

Description

[0001] This application claims priority to Chinese patent application No. 2023114521338 filed on November 2, 2023, entitled Defrost Control Method, Control Device, Storage Medium and Air Source Heat Pump System, the contents of which should be understood as being incorporated into this application by reference. Technical Field

[0002] The present invention relates to the technical field of electrical equipment, and more specifically, to a defrosting control method, a control device, a storage medium and an air source heat pump system. Background Art

[0003] With the development of society and the advancement of technology, the demand for air source heat pump systems is increasing. However, the plate heat exchanger antifreeze (i.e. outdoor heat exchanger antifreeze) during the defrosting process of air source heat pump systems is an important research topic, that is, the air source heat pump system must ensure that the defrosting plate does not freeze at low temperatures, and also ensure fast and reliable defrosting. Summary of the invention

[0004] An embodiment of the present invention provides a defrost control method for an air source heat pump system, comprising:

[0005] Determine whether to operate the defrost mode;

[0006] Based on the determination result that the defrost mode is in operation, the pressure Pe of the compressor return air port, the temperature Te of the outdoor heat exchanger and the temperature Ts of the circulating water circuit are obtained, and the target frequency f in the defrost process is determined according to Pe, Te and Ts, and then the defrost mode is operated and the current operating frequency f1 of the compressor is obtained;

[0007] According to f and f1, the frequency of the compressor is gradually adjusted to f.

[0008] In some exemplary embodiments, f∝(Pe, Te, Ts).

[0009] In some exemplary embodiments, the step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises:

[0010] Based on f-f1≤-A1, the compressor is frequency-reduced at a frequency change rate of -B1 / C1 until the frequency of the compressor is reduced to f;

[0011] Based on A1<f-f1, the compressor increases the frequency at the frequency change rate of B1 / C1 until the frequency of the compressor increases to f;

[0012] Among them, A1 is the first frequency threshold, B1 is the fifth frequency threshold, and C1 is the first time threshold.

[0013] In some exemplary embodiments, the step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises:

[0014] Based on -A1<f-f1≤-A2, the compressor is frequency-reduced at a frequency change rate of -B2 / C2 until the frequency of the compressor is reduced to f;

[0015] Based on A2<f-f1≤A1, the compressor increases the frequency at the frequency change rate of B2 / C2 until the frequency of the compressor increases to f;

[0016] Among them, A1 is the first frequency threshold, A2 is the second frequency threshold, B2 is the sixth frequency threshold, and C2 is the second time threshold.

[0017] In some exemplary embodiments, the step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises:

[0018] Based on -A2<f-f1≤-A3, the compressor is frequency-reduced at a frequency change rate of -B3 / C3 until the frequency of the compressor is reduced to f;

[0019] Based on A3<f-f1≤A2, the compressor increases the frequency at the frequency change rate of B3 / C3 until the frequency of the compressor increases to f;

[0020] Among them, A2 is the second frequency threshold, A3 is the third frequency threshold, B3 is the seventh frequency threshold, and C3 is the third time threshold.

[0021] In some exemplary embodiments, the step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises:

[0022] Based on -A3<f-f1≤-A4, the compressor is frequency-reduced at a frequency change rate of -B4 / C4 until the frequency of the compressor is reduced to f;

[0023] Based on A4<f-f1≤A3, the compressor increases the frequency at the frequency change rate of B4 / C4 until the frequency of the compressor increases to f;

[0024] Among them, A3 is the third frequency threshold, A4 is the fourth frequency threshold, B4 is the eighth frequency threshold, and C4 is the fourth time threshold.

[0025] In some exemplary embodiments, the step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises:

[0026] Based on -A4<f-f1≤A4, the compressor maintains operation at f1;

[0027] Wherein, A4 is the fourth frequency threshold.

[0028] An embodiment of the present invention further provides a control device, comprising a processor and a memory storing a computer program, wherein the processor implements the defrost control method described in any of the above embodiments when executing the computer program.

[0029] An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which is stored a computer program that can be run on a processor, and when the computer program is executed by the processor, the defrost control method described in any of the above embodiments is implemented.

[0030] An embodiment of the present invention further provides an air source heat pump system, comprising the control device described in any of the above embodiments.

[0031] The defrost control method provided in the embodiment of the present invention can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrost efficiency due to too slow frequency changes during the defrosting process. This solution can effectively improve the use comfort of the air source heat pump system.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0034] Figure 1 A flow chart of a defrost control method provided in some embodiments;

[0035] Figure 2 A flow chart of a defrost control method provided for other embodiments;

[0036] Figure 3 A schematic diagram of the structure of an air source heat pump system provided for some embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0038] The embodiment of the present invention provides a defrost control method for an air source heat pump system. Figure 1 As shown, including:

[0039] Determine whether to operate the defrost mode;

[0040] Based on the determination result that the defrost mode is in operation, the pressure Pe of the compressor return air port, the temperature Te of the outdoor heat exchanger and the temperature Ts of the circulating water circuit are obtained, and the target frequency f in the defrost process is determined according to Pe, Te and Ts, and then the defrost mode is operated and the current operating frequency f1 of the compressor is obtained;

[0041] According to f and f1, the frequency of the compressor is gradually adjusted to f according to the corresponding frequency change rate.

[0042] The defrost control method determines the target frequency f in the defrost process according to the pressure Pe of the compressor return air port, the temperature Te of the outdoor heat exchanger and the temperature Ts of the circulating water circuit before running the defrost mode. After running the defrost mode, according to f and f1, the frequency of the compressor is gradually adjusted to f according to the corresponding frequency change rate, where f1 is the current operating frequency of the compressor when running the defrost mode. By reasonably selecting the corresponding frequency change rate, it can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger can be defrosted quickly and reliably, avoiding the problems of abnormality of the compressor due to too fast frequency change and reduced defrost efficiency due to too slow frequency change during the defrost process. This scheme can effectively improve the use comfort of the air source heat pump system.

[0043] If the judgment result is that the defrost mode is not running, the compressor runs normally.

[0044] Among them, f∝(Pe, Te, Ts), the target frequency f can be determined according to the set ratio formula based on Pe, Te, Ts. Of course, it is also possible to determine the target frequency f according to the data table formed by Pe, Te, Ts, the target frequency, the pressure of the compressor return air port, the temperature of the outdoor heat exchanger and the temperature of the circulating water circuit. The above can all achieve the purpose of this application, and its purpose does not deviate from the design concept of the present invention, and will not be repeated here, and should all fall within the protection scope of this application.

[0045] In some examples, such as Figure 2 As shown, according to f and f1, the steps of gradually adjusting the frequency of the compressor to f according to the corresponding frequency change rate include:

[0046] Based on f-f1≤-A1, the compressor is frequency-reduced at a frequency change rate of -B1 / C1 until the frequency of the compressor is reduced to f;

[0047] Based on A1<f-f1, the compressor increases the frequency at the frequency change rate of B1 / C1 until the frequency of the compressor increases to f;

[0048] Among them, A1 is the first frequency threshold, B1 is the fifth frequency threshold, and C1 is the first time threshold.

[0049] In some embodiments, A1 is set to 7 Hz or 8 Hz, B1 is set to 7 Hz or 8 Hz, and C1 is set to 8 s to 12 s (eg, 10 s).

[0050] When f-f1≤-A1, the compressor reduces frequency at a frequency change rate of -B1 / C1 until the frequency of the compressor gradually decreases to f. This solution can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0051] When f-f1>A1, the compressor increases the frequency at the frequency change rate of B1 / C1 until the frequency of the compressor gradually increases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0052] In some examples, such as Figure 2 As shown, according to f and f1, the step of gradually adjusting the frequency of the compressor to f according to the corresponding frequency change rate also includes:

[0053] Based on -A1<f-f1≤-A2, the compressor is frequency-reduced at a frequency change rate of -B2 / C2 until the frequency of the compressor is reduced to f;

[0054] Based on A2<f-f1≤A1, the compressor increases the frequency at the frequency change rate of B2 / C2 until the frequency of the compressor increases to f;

[0055] Among them, A2 is the second frequency threshold, B2 is the sixth frequency threshold, and C2 is the second time threshold.

[0056] In some embodiments, A2 is set to 5 Hz or 6 Hz, B2 is set to 5 Hz or 6 Hz, and C2 is set to 8 s to 12 s (eg, 10 s).

[0057] When -A1<f-f1≤-A2, the compressor reduces its frequency at a frequency change rate of -B2 / C2 until the frequency of the compressor gradually decreases to f. This solution can not only ensure that the outdoor heat exchanger does not freeze at low temperatures, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding problems such as compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0058] When A2<f-f1≤A1, the compressor increases the frequency at the frequency change rate of B2 / C2 until the frequency of the compressor gradually increases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the compressor abnormality due to too fast frequency change during the defrosting process and reducing the defrosting efficiency due to too slow frequency change, which can effectively improve the use comfort of the air source heat pump system.

[0059] In some examples, such as Figure 2 As shown, according to f and f1, the step of gradually adjusting the frequency of the compressor to f according to the corresponding frequency change rate also includes:

[0060] Based on -A2<f-f1≤-A3, the compressor is frequency-reduced at a frequency change rate of -B3 / C3 until the frequency of the compressor is reduced to f;

[0061] Based on A3<f-f1≤A2, the compressor increases the frequency at the frequency change rate of B3 / C3 until the frequency of the compressor increases to f;

[0062] Among them, A3 is the third frequency threshold, B3 is the seventh frequency threshold, and C3 is the third time threshold.

[0063] In some embodiments, A3 is set to 3 Hz or 4 Hz, B3 is set to 3 Hz or 4 Hz, and C3 is set to 8 s to 12 s (eg, 10 s).

[0064] When -A2<f-f1≤-A3, the compressor reduces the frequency at a frequency change rate of -B3 / C3 until the frequency of the compressor gradually decreases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the compressor abnormality due to too fast frequency change and reduced defrosting efficiency due to too slow frequency change during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0065] When A3<f-f1≤A2, the compressor increases the frequency at the frequency change rate of B3 / C3 until the frequency of the compressor gradually increases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0066] In some examples, such as Figure 2 As shown, according to f and f1, the steps of gradually adjusting the frequency of the compressor to f according to the corresponding frequency change rate include:

[0067] Based on -A3<f-f1≤-A4, the compressor is frequency-reduced at a frequency change rate of -B4 / C4 until the frequency of the compressor is reduced to f;

[0068] Based on A4<f-f1≤A3, the compressor increases the frequency at the frequency change rate of B4 / C4 until the frequency of the compressor increases to f;

[0069] Among them, A4 is the fourth frequency threshold, B4 is the eighth frequency threshold, and C4 is the fourth time threshold.

[0070] In some embodiments, A4 is set to 1 Hz or 2 Hz, B4 is set to 1 Hz or 2 Hz, and C4 is set to 8s to 12s (eg, 10s).

[0071] When -A3<f-f1≤-A4, the compressor reduces the frequency at a frequency change rate of -B4 / C4 until the frequency of the compressor gradually decreases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0072] When A4<f-f1≤A3, the compressor increases the frequency at the frequency change rate of B4 / C4 until the frequency of the compressor gradually increases to f. This scheme can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrosting efficiency due to too slow frequency changes during the defrosting process, and can effectively improve the use comfort of the air source heat pump system.

[0073] In some examples, such as Figure 2 As shown, according to f and f1, the steps of gradually adjusting the frequency of the compressor to f according to the corresponding frequency change rate include:

[0074] Based on -A4<f-f1≤A4, the compressor maintains running at f1 for defrosting.

[0075] In some embodiments, A4 is set to 1 Hz.

[0076] An embodiment of the present invention further provides a control device (not shown in the figure), including a processor and a memory storing a computer program, and the processor implements the defrost control method of any of the above embodiments when executing the computer program.

[0077] The processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present invention can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0078] An embodiment of the present invention further provides a non-transitory computer-readable storage medium (not shown in the figure), on which is stored a computer program that can be run on a processor. When the computer program is executed by the processor, the defrost control method of any of the above embodiments is implemented.

[0079] The embodiment of the present invention also provides an air source heat pump system, such as Figure 3 As shown, it includes a compressor 100, an outdoor heat exchanger 200, an indoor heat exchanger 300, a circulating water circuit 400, a throttling device 500, a detection device and the control device described in any of the above embodiments.

[0080] The detection device is configured to detect the pressure Pe of the compressor return air port, the temperature Te of the outdoor heat exchanger and the temperature Ts of the circulating water circuit before running the defrost mode. The control device is configured to determine the target frequency f during the defrost process according to Pe, Te and Ts. The control device is also configured to obtain the current operating frequency f1 of the compressor when running the defrost mode. The control device is also configured to gradually adjust the frequency of the compressor to f according to f and f1 and the corresponding frequency change rate when running the defrost mode.

[0081] In some embodiments, Figure 3 As shown, the air source heat pump system also includes components such as a four-way valve 600.

[0082] To sum up, the defrost control method provided in the embodiment of the present invention can not only ensure that the outdoor heat exchanger does not freeze at low temperature, but also ensure that the outdoor heat exchanger is defrosted quickly and reliably, avoiding the problem of compressor abnormalities due to too fast frequency changes and reduced defrost efficiency due to too slow frequency changes during the defrost process. This solution can effectively improve the use comfort of the air source heat pump system.

[0083] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred structure has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0084] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be defined by the attached claims.

Claims

1. A defrost control method for an air source heat pump system, characterized in that: include: Determine whether to operate the defrost mode; Based on the determination result that the defrost mode is in operation, the pressure Pe of the compressor return air port, the temperature Te of the outdoor heat exchanger and the temperature Ts of the circulating water circuit are obtained, and the target frequency f in the defrost process is determined according to Pe, Te and Ts, and then the defrost mode is operated and the current operating frequency f1 of the compressor is obtained; According to f and f1, the frequency of the compressor is gradually adjusted to f.

2. The defrost control method according to claim 1, characterized in that: f∝(Pe,Te,Ts).

3. The defrost control method according to claim 1, characterized in that: The step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises: Based on f-f1≤-A1, the compressor is frequency-reduced at a frequency change rate of -B1 / C1 until the frequency of the compressor is reduced to f; Based on A1<f-f1, the compressor increases the frequency at the frequency change rate of B1 / C1 until the frequency of the compressor increases to f; Among them, A1 is the first frequency threshold, B1 is the fifth frequency threshold, and C1 is the first time threshold.

4. The defrost control method according to claim 1, characterized in that: The step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises: Based on -A1<f-f1≤-A2, the compressor is frequency-reduced at a frequency change rate of -B2 / C2 until the frequency of the compressor is reduced to f; Based on A2<f-f1≤A1, the compressor increases the frequency at the frequency change rate of B2 / C2 until the frequency of the compressor increases to f; Among them, A1 is the first frequency threshold, A2 is the second frequency threshold, B2 is the sixth frequency threshold, and C2 is the second time threshold.

5. The defrost control method according to claim 1, characterized in that: The step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises: Based on -A2<f-f1≤-A3, the compressor is frequency-reduced at a frequency change rate of -B3 / C3 until the frequency of the compressor is reduced to f; Based on A3<f-f1≤A2, the compressor increases the frequency at the frequency change rate of B3 / C3 until the frequency of the compressor increases to f; Among them, A2 is the second frequency threshold, A3 is the third frequency threshold, B3 is the seventh frequency threshold, and C3 is the third time threshold.

6. The defrost control method according to claim 1, characterized in that: The step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises: Based on -A3<f-f1≤-A4, the compressor is frequency-reduced at a frequency change rate of -B4 / C4 until the frequency of the compressor is reduced to f; Based on A4<f-f1≤A3, the compressor increases the frequency at the frequency change rate of B4 / C4 until the frequency of the compressor increases to f; Among them, A3 is the third frequency threshold, A4 is the fourth frequency threshold, B4 is the eighth frequency threshold, and C4 is the fourth time threshold.

7. The defrost control method according to claim 1, characterized in that: The step of gradually adjusting the frequency of the compressor to f according to f and f1 comprises: Based on -A4<f-f1≤A4, the compressor maintains operation at f1; Wherein, A4 is the fourth frequency threshold.

8. A control device, characterized in that: The device comprises a processor and a memory storing a computer program, wherein the processor implements the defrost control method according to any one of claims 1 to 7 when executing the computer program.

9. A non-transitory computer-readable storage medium, characterized in that: The storage medium stores a computer program that can be run on a processor, and when the computer program is executed by the processor, the defrost control method according to any one of claims 1 to 7 is implemented.

10. An air source heat pump system, characterized in that: Comprising the control device as claimed in claim 8.

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