Defrosting method, device and heat pump system

Abstract

The embodiment of the present application discloses a defrosting method, device and heat pump system. The method comprises: obtaining an ambient temperature and operation data of the heat pump system, wherein the operation data comprises at least one of a coil temperature of the fin heat exchanger or a pressure value of the heat pump system; determining whether a defrosting condition is met according to the ambient temperature and the operation data; and adjusting at least one of a fan rotating speed or a compressor frequency for defrosting if the defrosting condition is met. The technical scheme provided by the embodiment of the present application improves the accuracy of frost determination, avoids the risk of misjudgment, uses the ambient temperature for defrosting, does not affect the heating effect of the heat pump system in the defrosting process, improves the defrosting efficiency, and effectively reduces the defrosting cost.

Description

Technical Field

[0001] This invention relates to the field of heat pump defrosting technology, and in particular to a defrosting method, apparatus and heat pump system. Background Technology

[0002] With the continuous advancement of life and technology, heat pump systems have become an indispensable energy conversion tool in industrial production and daily life. However, the heat exchanger in the heat pump system may experience frost formation during operation, which can seriously affect the working efficiency and heating effect of the heat pump system.

[0003] Currently, defrosting heat exchangers typically employs reverse circulation defrosting and heated defrosting, requiring the fan to be shut down and the system switched to cooling mode. This necessitates frequent reversals of the four-way valve and the addition of a heater at the compressor's suction end. This not only increases the complexity and manufacturing cost of the heat pump system but also results in slow defrosting, incomplete defrosting, and an inability to supply heat to the user side. In some cases, it may even draw heat from the user's side, leading to a poor user experience and impacting user comfort.

[0004] The existing defrosting methods are inefficient and lack intelligence, which has become a technical problem that the industry urgently needs to solve. Summary of the Invention

[0005] This invention provides a defrosting method, apparatus, and heat pump system to solve the problems of low efficiency and lack of intelligence in existing defrosting methods, thereby improving defrosting efficiency and achieving high-efficiency, energy-saving, and intelligent defrosting.

[0006] According to one aspect of the present invention, a defrosting method is provided for use in a heat pump system, the heat pump system including a first heat exchanger, a compressor, and a fan, the first heat exchanger including a finned heat exchanger, the defrosting method comprising:

[0007] Acquire ambient temperature and operating data of the heat pump system, wherein the operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system;

[0008] Determine whether defrosting conditions are met based on the ambient temperature and the operating data;

[0009] If the defrosting conditions are met, defrosting is performed by adjusting at least one of the fan speed or the compressor frequency.

[0010] Optionally, determining whether defrosting conditions are met based on the ambient temperature and the operating data includes:

[0011] When the ambient temperature is lower than the preset ambient temperature and the coil temperature of the finned heat exchanger is lower than the first preset temperature value, the defrosting condition is determined to be met.

[0012] Optionally, determining whether defrosting conditions are met based on the ambient temperature and the operating data further includes:

[0013] When the ambient temperature is lower than the preset ambient temperature and the pressure value of the heat pump system is lower than the first preset pressure value, it is determined that the defrosting conditions are met.

[0014] Optionally, if the defrosting conditions are met, defrosting is performed by adjusting at least one of the fan speed or the compressor frequency, including:

[0015] If the defrosting conditions are met, the fan speed is adjusted to increase by one level based on the first speed and / or the compressor speed is decreased by one level based on the first frequency;

[0016] Wherein, the first rotational speed is the current rotational speed of the fan, and the first frequency is the current frequency of the compressor.

[0017] Optionally, if the defrosting conditions are met, after defrosting by adjusting at least one of the fan speed or the compressor frequency, the method further includes:

[0018] The decision to reduce the fan speed and increase the compressor frequency is determined based on the relationship between the coil temperature of the finned heat exchanger and the second preset temperature value.

[0019] Optionally, determining whether to reduce the fan speed and increase the compressor frequency based on the relationship between the coil temperature of the finned heat exchanger and the second preset temperature value includes:

[0020] After the heat pump system performs the first preset defrosting time, if the coil temperature of the finned heat exchanger is greater than or equal to the second preset temperature value, the fan speed is adjusted to decrease by one level based on the second speed and / or the compressor frequency is increased by one level based on the second frequency.

[0021] Wherein, the second rotational speed is the rotational speed of the fan increased by one level based on the first rotational speed, and the second frequency is the frequency of the compressor decreased by one level based on the first frequency.

[0022] Optionally, if the defrosting conditions are met, after defrosting by adjusting at least one of the fan speed or the compressor frequency, the method further includes:

[0023] Based on the relationship between the pressure value of the heat pump system and the second preset pressure value, it is determined whether to reduce the fan speed and increase the compressor frequency.

[0024] Optionally, based on the relationship between the pressure value of the heat pump system and the second preset pressure value, determining whether to reduce the fan speed and increase the compressor frequency includes:

[0025] After the heat pump system performs the first preset defrosting time, if the pressure value of the heat pump system is greater than or equal to the second preset pressure value, the fan speed is adjusted to decrease by one level based on the second speed and / or the compressor frequency is increased by one level based on the second frequency.

[0026] Wherein, the second rotational speed is the rotational speed of the fan increased by one level based on the first rotational speed, and the second frequency is the frequency of the compressor decreased by one level based on the first frequency.

[0027] According to another aspect of the present invention, a defrosting device is provided for use in a heat pump system, the heat pump system including a first heat exchanger, a compressor, and a fan, the first heat exchanger including a finned heat exchanger, the defrosting device comprising:

[0028] The data acquisition module is used to acquire ambient temperature and operating data of the heat pump system; wherein, the operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system;

[0029] The defrosting determination module is used to determine whether defrosting conditions are met based on the ambient temperature and the operating data.

[0030] The defrosting control module is used to adjust at least one of the fan speed or the compressor frequency to perform defrosting if the defrosting conditions are met.

[0031] According to another aspect of the present invention, a heat pump system is provided, comprising: a first heat exchanger, a second heat exchanger, a compressor, a fan, a four-way valve, an electronic expansion valve, and a defrosting device provided in any of the above embodiments; wherein the first heat exchanger comprises a finned heat exchanger.

[0032] The technical solution of this invention first acquires the ambient temperature and the operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system. Then, based on the ambient temperature and operating data, it is determined whether defrosting conditions are met. If the defrosting conditions are met, at least one of the fan speed or compressor frequency is adjusted to perform defrosting. Determining whether defrosting conditions are met by using ambient temperature and the operating data of the heat pump system improves the accuracy of the judgment, accurately determining whether the heat exchanger is frosted and avoiding the risk of misjudgment. By increasing the evaporation temperature through fan speed and compressor frequency, the ambient temperature is raised, and defrosting is performed based on the ambient temperature. The defrosting process does not affect the heating effect of the heat pump system. The defrosting method is simple, with no heat loss during defrosting, improving defrosting efficiency and achieving highly efficient and energy-saving intelligent defrosting, while effectively reducing defrosting costs.

[0033] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A flowchart of a defrosting method provided in an embodiment of the present invention;

[0036] Figure 2 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0037] Figure 3 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0038] Figure 4 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0039] Figure 5 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0040] Figure 6 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0041] Figure 7 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0042] Figure 8 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0043] Figure 9 This is a schematic diagram of a defrosting device provided in an embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of a heat pump system provided in an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] Figure 1 This is a flowchart illustrating a defrosting method provided by an embodiment of the present invention, applicable to defrosting of heat pump systems. The method can be executed by a defrosting device, which can be implemented in hardware and / or software.

[0048] like Figure 1 As shown, the defrosting method provided in this embodiment of the invention includes:

[0049] S110. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0050] Specifically, during the normal operation of a heat pump system, frost may form on the heat exchanger when the ambient temperature is low. Frost on the heat exchanger can affect the heating efficiency of the heat pump system. Therefore, timely defrosting of the heat exchanger is necessary. Whether defrosting is required depends on the ambient temperature and the operating data of the heat pump system. Therefore, it is necessary to first obtain the ambient temperature and the operating data of the heat pump system. This operating data can include at least one of the following: the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0051] Specifically, ambient temperature refers to the temperature of the environment surrounding the heat pump system during operation, which can be measured by an ambient temperature sensor; coil temperature of the finned heat exchanger refers to the temperature of the coil of the finned heat exchanger, which can be measured by a finned coil temperature sensor; and pressure value of the heat pump system is the pressure value of the heat pump system during operation, which can be measured by a pressure sensor.

[0052] S120. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0053] Specifically, during the operation of a heat pump system, heat exchangers are prone to frosting when the ambient temperature is low. When the coil temperature of the finned heat exchanger is low, or when the pressure of the heat pump system falls below a certain value, it indicates that the finned heat exchanger has frosted. Therefore, based on the ambient temperature and the operating data of the heat pump system, it can be determined whether the defrosting conditions are met. Using ambient temperature and the operating data of the heat pump system to determine whether defrosting conditions are met improves the accuracy of the judgment and allows for a precise determination of whether the heat exchanger is frosted.

[0054] S130. If the defrosting conditions are met, defrost by adjusting at least one of the fan speed or compressor frequency.

[0055] Specifically, once the ambient temperature and operating data of the heat pump system accurately determine that the system meets the defrosting conditions, defrosting can be performed by adjusting the fan speed and compressor frequency. Adjusting the fan speed and compressor frequency adjusts the evaporation temperature, increasing it. Consequently, the ambient temperature of the heat pump system also rises accordingly, thus utilizing the ambient temperature to defrost the heat exchanger.

[0056] The defrosting method provided in this invention first acquires the ambient temperature and the operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system. Then, based on the ambient temperature and operating data, it is determined whether defrosting conditions are met. If the defrosting conditions are met, at least one of the fan speed or compressor frequency is adjusted to perform defrosting. Determining whether defrosting conditions are met by using ambient temperature and the operating data of the heat pump system improves the accuracy of the judgment, enabling accurate identification of whether the heat exchanger is frosted and avoiding the risk of misjudgment. By increasing the evaporation temperature through fan speed and compressor frequency, the ambient temperature is raised, and defrosting is performed based on the ambient temperature. The defrosting process does not affect the heating effect of the heat pump system. The defrosting method is simple, with no heat loss during defrosting, improving defrosting efficiency and achieving highly efficient and energy-saving intelligent defrosting, while effectively reducing defrosting costs.

[0057] Optional, Figure 2A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to flowchart illustration]. Figure 2 The defrosting method provided in this embodiment of the invention includes:

[0058] S210. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0059] S220. When the ambient temperature is lower than the preset ambient temperature and the coil temperature of the finned heat exchanger is lower than the first preset temperature value, the defrosting condition is determined to be met.

[0060] Specifically, during the operation of a heat pump system, the defrosting conditions can be determined based on the ambient temperature and the coil temperature of the finned heat exchanger. When the ambient temperature of the heat pump system is lower than a preset ambient temperature and the coil temperature of the finned heat exchanger is lower than a first preset temperature value, the heat pump system meets the defrosting conditions. The preset ambient temperature and the first preset temperature value can be set according to actual needs. For example, the preset ambient temperature can be 5℃ and the first preset temperature value can be -2℃. Defrosting is only met when the ambient temperature is lower than 5℃ and the coil temperature of the finned heat exchanger is lower than -2℃. For instance, if the ambient temperature is 0℃ and the coil temperature of the finned heat exchanger is -5℃, the ambient temperature is lower than the preset ambient temperature, and the coil temperature of the finned heat exchanger is lower than the first preset temperature value, indicating that the heat pump system meets the defrosting conditions and defrosting is required.

[0061] S230. If the defrosting conditions are met, defrost by adjusting at least one of the fan speed or compressor frequency.

[0062] Optional, Figure 3 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 3 The defrosting method provided in this embodiment of the invention includes:

[0063] S310. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0064] S320. When the ambient temperature is lower than the preset ambient temperature and the pressure value of the heat pump system is lower than the first preset pressure value, the defrosting conditions are determined to be met.

[0065] Specifically, during the operation of a heat pump system, the ambient temperature and pressure of the system can be used to determine whether the system meets the defrosting conditions. When the ambient temperature is lower than a preset ambient temperature and the system pressure is lower than a first preset pressure value, the system meets the defrosting conditions. The first preset pressure value can be set according to actual needs; for example, it is 6.16 bar. Defrosting is only met when the ambient temperature is below 5°C and the system pressure is below 6.16 bar. For example, if the ambient temperature is 0°C and the system pressure is 4.16 bar, this means the system meets the defrosting conditions and defrosting is required.

[0066] S330. If the defrosting conditions are met, defrost by adjusting at least one of the fan speed or compressor frequency.

[0067] Optional, Figure 4 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 4 The defrosting method provided in this embodiment of the invention includes:

[0068] S410. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0069] S420. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0070] S430. If the defrosting conditions are met, adjust the fan speed to increase by one level from the first speed and / or the compressor speed to decrease by one level from the first frequency. Here, the first speed is the current fan speed, and the first frequency is the current compressor frequency.

[0071] Specifically, when the heat pump system meets the defrosting conditions based on the ambient temperature and its operating data, defrosting can be performed by increasing the fan speed and decreasing the compressor frequency, at least one of these methods. Increasing the fan speed and decreasing the compressor frequency adjusts the evaporation temperature, raising it and consequently increasing the ambient temperature of the heat pump system, thus utilizing the ambient temperature for defrosting. In this embodiment, the fan speed and compressor frequency can be controlled simultaneously or individually for defrosting. Furthermore, the fan speed can be adjusted via gear settings or by a specific numerical speed setting, and the compressor frequency can also be adjusted via gear settings or by a specific numerical frequency setting. Here, the first speed refers to the current fan speed, which is the fan speed when the heat pump system is operating normally before defrosting, and the first frequency refers to the current compressor frequency, which is the compressor frequency when the heat pump system is operating normally before defrosting.

[0072] Specifically, after the heat pump system has been defrosting for a period of time, it can be determined whether to perform enhanced defrosting based on the coil temperature of the finned heat exchanger or the pressure value of the heat pump system. If the coil temperature of the finned heat exchanger is still lower than the first preset temperature value or the current frequency of the compressor is still lower than the first preset pressure value, it indicates that the frosting situation of the heat pump system is relatively serious, and it is necessary to increase the fan speed or reduce the compressor frequency to improve the defrosting speed.

[0073] The defrosting method provided in this invention raises the ambient temperature by controlling the fan speed and compressor frequency, and uses the ambient temperature to draw heat pumps for defrosting. The defrosting process is simple, and the fan speed and compressor frequency can be automatically adjusted according to the frost situation, which improves the defrosting efficiency. Defrosting is performed using the environment, so there is no heat loss, which is highly efficient and energy-saving. It does not absorb heat from the user side, which improves user comfort.

[0074] Optional, Figure 5 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 5 The defrosting method provided in this embodiment of the invention includes:

[0075] S510. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0076] S520. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0077] S530. If the defrosting conditions are met, adjust the fan speed to increase by one level from the first speed and / or the compressor speed to decrease by one level from the first frequency. Here, the first speed is the current fan speed, and the first frequency is the current compressor frequency.

[0078] S540. Determine whether to reduce the fan speed and increase the compressor frequency based on the relationship between the coil temperature of the finned heat exchanger and the second preset temperature value.

[0079] Specifically, after the heat pump system begins defrosting, the fan speed and compressor frequency cannot remain at the same level as during defrosting. Once the frosting situation improves, the fan speed and compressor frequency need to be restored to their pre-defrosting operating modes. Whether to reduce the fan speed and increase the compressor frequency can be determined based on the relationship between the coil temperature of the finned heat exchanger and a second preset temperature value. The second preset temperature value can be set according to actual needs; for example, it can be 0°C.

[0080] Optional, Figure 6 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 6 The defrosting method provided in this embodiment of the invention includes:

[0081] S610. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0082] S620. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0083] S630. If the defrosting conditions are met, adjust the fan speed to increase by one level from the first speed and / or the compressor speed to decrease by one level from the first frequency. Here, the first speed is the current fan speed, and the first frequency is the current compressor frequency.

[0084] S640. After the heat pump system executes the first preset defrosting time, if the coil temperature of the finned heat exchanger is greater than or equal to the second preset temperature value, the fan speed is adjusted to decrease by one level based on the second speed and / or the compressor frequency is increased by one level based on the second frequency.

[0085] Specifically, after the heat pump system has been defrosting for a period of time, the relationship between the coil temperature of the finned heat exchanger and the second preset temperature value can be used to determine whether to restore the fan speed and compressor frequency. When the coil temperature of the finned heat exchanger is greater than or equal to the second preset temperature value, it indicates that the coil temperature of the finned heat exchanger is high, the frosting problem has been solved, and the heat pump system will not experience frosting at the current temperature. Therefore, the fan speed can be adjusted to be one level lower than the second speed, and the compressor frequency can be adjusted to be one level higher than the second frequency. Here, the second speed is the fan speed increased by one level from the first speed, and the second frequency is the compressor frequency decreased by one level from the first frequency. For example, if the detected coil temperature of the finned heat exchanger is 3℃, which is greater than the second preset temperature value of 0℃, then the fan speed is adjusted to be one level lower than the second speed, and the compressor frequency is adjusted to be one level higher than the second frequency.

[0086] Optional, Figure 7 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 7 The defrosting method provided in this embodiment of the invention includes:

[0087] S710. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0088] S720. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0089] S730. If the defrosting conditions are met, adjust the fan speed to increase by one level from the first speed and / or the compressor speed to decrease by one level from the first frequency. Here, the first speed is the current fan speed, and the first frequency is the current compressor frequency.

[0090] S740: Determine whether to reduce the fan speed and increase the compressor frequency based on the relationship between the pressure value of the heat pump system and the second preset pressure value.

[0091] Specifically, after the defrosting situation of the heat pump system improves, the fan speed and compressor frequency cannot continue to operate at their current state indefinitely; they need to be restored to the pre-defrosting operating mode. It can also be determined whether to reduce the fan speed and increase the compressor frequency based on the relationship between the heat pump system's pressure value and a second preset pressure value. The second preset pressure value can be set according to actual needs; for example, it could be 7.12 bar.

[0092] Optional, Figure 8A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 8 The defrosting method provided in this embodiment of the invention includes:

[0093] S810. Obtain ambient temperature and operating data of the heat pump system. The operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0094] S820. Determine whether defrosting conditions are met based on ambient temperature and operating data.

[0095] S830. If the defrosting conditions are met, adjust the fan speed to increase by one level from the first speed and / or the compressor speed to decrease by one level from the first frequency. Here, the first speed is the current fan speed, and the first frequency is the current compressor frequency.

[0096] S840. After the heat pump system performs the first preset defrosting time, if the pressure value of the heat pump system is greater than or equal to the second preset pressure value, the fan speed is adjusted to decrease by one level based on the second speed and / or the compressor frequency is increased by one level based on the second frequency.

[0097] Specifically, after the heat pump system has been defrosting for a period of time, the relationship between the system pressure and the second preset pressure value can be used to determine whether to restore the fan speed and compressor frequency. When the system pressure is greater than or equal to the second preset pressure value, it indicates that the system temperature is high, the frosting problem has been resolved, and the system will not frost at the current temperature. Therefore, the fan speed can be reduced by one level from the second preset speed, and the compressor frequency can be increased by one level from the second preset frequency. Here, the second speed is the fan speed increased by one level from the first speed, and the second frequency is the compressor frequency decreased by one level from the first frequency. For example, if the system pressure is detected to be 8.62 bar, which is greater than the second preset pressure value of 7.12 bar, the fan speed is reduced by one level from the second preset speed, and the compressor frequency is increased by one level from the second preset frequency.

[0098] The defrosting method provided in this invention determines the defrosting status by the coil temperature of the finned heat exchanger or the pressure value of the heat pump system. After defrosting is completed, the fan speed is immediately reduced or the compressor frequency is increased to restore the original operating state of the heat pump system. This does not affect the heating effect of the heat pump system, and the heat on the user side is not affected, thus improving user comfort.

[0099] This invention also provides a defrosting device. Figure 9This is a schematic diagram of a defrosting device provided in an embodiment of the present invention. Based on the above embodiments, as follows... Figure 9 As shown, the defrosting device 10 includes:

[0100] The data acquisition unit 11 is used to acquire ambient temperature and operating data of the heat pump system; wherein the operating data includes at least one of the coil temperature of the finned heat exchanger or the pressure value of the heat pump system.

[0101] The defrosting determination module 12 is used to determine whether defrosting conditions are met based on ambient temperature and operating data.

[0102] The defrosting control module 13 is used to perform defrosting by adjusting at least one of the fan speed or the compressor frequency if the defrosting conditions are met.

[0103] This invention employs a data acquisition unit to obtain ambient temperature and heat pump system operating data. A defrosting determination module determines whether defrosting conditions are met. A defrosting control module then adjusts at least one of the fan speed or compressor frequency to perform defrosting under these conditions. The defrosting determination module accurately determines whether the heat exchanger is frosted, avoiding the risk of misjudgment. The defrosting control module uses the fan speed and compressor frequency to increase the overall evaporation temperature, thereby raising the ambient temperature for defrosting. This improves defrosting efficiency, eliminates heat loss, and enhances system reliability.

[0104] The defrosting device provided in the embodiments of the present invention can perform the defrosting method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of performing the method.

[0105] This invention also provides a heat pump system 100. Figure 10 This is a schematic diagram of a heat pump system provided as an embodiment of the present invention. Based on the above embodiments, as follows... Figure 10 The heat pump system 100 includes a first heat exchanger 1, a second heat exchanger 2, a compressor 3, a fan 4, a four-way valve 5, an electronic expansion valve 6, and a defrosting device 10 provided in any of the above embodiments. The first heat exchanger 1 includes a finned heat exchanger 7.

[0106] Furthermore, the heat pump system 100 also includes an ambient temperature sensor 21, a pressure sensor 22, and a finned coil temperature sensor 23.

[0107] Specifically, the first end of compressor 3 is connected to the first port of four-way valve 5, the second end of compressor 3 is connected to the third port of four-way valve 5, the first end of finned heat exchanger 7 is connected to the second port of four-way valve 5, the electronic expansion valve 6 is connected to the first end of finned heat exchanger 7 and second heat exchanger 2, and the second end of second heat exchanger 2 is connected to the fourth port of four-way valve 5. Fan 4 is located below finned heat exchanger 7. Ambient temperature sensor 21 is located in heat pump system 100 and is used to obtain the ambient temperature of the heat pump system. Pressure sensor 22 is located in heat pump system 100 and is used to obtain the pressure value of the heat pump system. Finned coil temperature sensor 23 is located near the coil of finned heat exchanger 7 and is used to obtain the coil temperature of finned heat exchanger 7.

[0108] The heat pump system provided in this invention increases the evaporation temperature by adjusting the fan speed and compressor frequency, thereby raising the ambient temperature. Defrosting is then performed using the ambient temperature, eliminating the need to switch the electronic expansion valve and four-way valve. It does not absorb heat from the user side; defrosting is performed by the heat pump system itself, resulting in fast and efficient defrosting. This improves the reliability and lifespan of the heat pump system and effectively saves defrosting costs.

[0109] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A defrosting method, characterized by, The defrosting method is applied to a heat pump system, the heat pump system comprising a first heat exchanger, a compressor and a fan, the first heat exchanger comprising a fin heat exchanger, and the defrosting method comprising: obtaining an ambient temperature and operation data of the heat pump system, wherein the operation data comprises at least one of a coil temperature of the fin heat exchanger or a pressure value of the heat pump system; determining whether a defrosting condition is met according to the ambient temperature and the operation data; if the defrosting condition is met, adjusting at least one of a fan speed or a compressor frequency for defrosting; determining whether the defrosting condition is met according to the ambient temperature and the operation data, comprising: if the ambient temperature is less than a preset ambient temperature and the coil temperature of the fin heat exchanger is less than a first preset temperature value, it is determined that the defrosting condition is met; determining whether the defrosting condition is met according to the ambient temperature and the operation data, further comprising: if the ambient temperature is less than a preset ambient temperature and the pressure value of the heat pump system is less than a first preset pressure value, it is determined that the defrosting condition is met; if the defrosting condition is met, adjusting at least one of the fan speed or the compressor frequency for defrosting, comprising: if the defrosting condition is met, adjusting the fan speed to increase by one step on the basis of a first speed and / or the compressor to decrease by one step on the basis of a first frequency; wherein the first speed is a current speed of the fan, and the first frequency is a current frequency of the compressor.

2. The defrosting method according to claim 1, characterized in that, if the defrosting condition is met, adjusting at least one of the fan speed or the compressor frequency for defrosting, further comprising: determining whether to decrease the fan speed and increase the compressor frequency according to a relationship between the coil temperature of the fin heat exchanger and a second preset temperature value.

3. The defrosting method according to claim 2, characterized in that, determining whether to decrease the fan speed and increase the compressor frequency according to a relationship between the coil temperature of the fin heat exchanger and a second preset temperature value, comprising: if the heat pump system performs defrosting for a first preset time, and the coil temperature of the fin heat exchanger is greater than or equal to the second preset temperature value, adjusting the fan speed to decrease by one step on the basis of a second speed and / or the compressor frequency to increase by one step on the basis of a second frequency; wherein the second speed is a speed of the fan increased by one step on the basis of the first speed, and the second frequency is a frequency of the compressor decreased by one step on the basis of the first frequency.

4. The defrosting method according to claim 1, characterized in that, if the defrosting condition is met, adjusting at least one of the fan speed or the compressor frequency for defrosting, further comprising: determining whether to decrease the fan speed and increase the compressor frequency according to a relationship between the pressure value of the heat pump system and a second preset pressure value.

5. The defrosting method according to claim 4, characterized in that, determining whether to decrease the fan speed and increase the compressor frequency according to a relationship between the pressure value of the heat pump system and a second preset pressure value, comprising: If the pressure value of the heat pump system is greater than or equal to the second preset pressure value after the heat pump system performs defrosting for the first preset time, the fan speed is adjusted to decrease by one step on the basis of the second speed and / or the compressor frequency is adjusted to increase by one step on the basis of the second frequency. The second speed is a speed at which the fan increases by one step on the basis of the first speed, and the second frequency is a frequency at which the compressor decreases by one step on the basis of the first frequency.

6. A defrosting device, characterized in that The heat pump system comprises a first heat exchanger, a compressor and a fan, the first heat exchanger comprises a fin heat exchanger, and the defrosting device comprises: The data acquisition module is configured to acquire an ambient temperature and operation data of the heat pump system, wherein the operation data comprises at least one of a coil temperature of the fin heat exchanger or a pressure value of the heat pump system. The defrosting determination module is configured to determine whether a defrosting condition is met according to the ambient temperature and the operation data. The defrosting control module is configured to adjust at least one of the fan speed or the compressor frequency for defrosting if the defrosting condition is met. The defrosting determination module is configured to determine whether a defrosting condition is met according to the ambient temperature and the operation data. If the ambient temperature is less than a preset ambient temperature and the coil temperature of the fin heat exchanger is less than a first preset temperature value, it is determined that the defrosting condition is met. The defrosting determination module is configured to determine whether a defrosting condition is met according to the ambient temperature and the operation data. If the ambient temperature is less than a preset ambient temperature and the pressure value of the heat pump system is less than a first preset pressure value, it is determined that the defrosting condition is met. The defrosting control module is configured to adjust at least one of the fan speed or the compressor frequency for defrosting if the defrosting condition is met. If the defrosting condition is met, the fan speed is adjusted to increase by one step on the basis of the first speed and / or the compressor is adjusted to decrease by one step on the basis of the first frequency. The first speed is a current speed of the fan, and the first frequency is a current frequency of the compressor.

7. A heat pump system, characterized by, The heat pump system comprises a first heat exchanger, a second heat exchanger, a compressor, a fan, a four-way valve, an electronic expansion valve and the defrosting device of claim 6, wherein the first heat exchanger comprises a fin heat exchanger. ​

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