Flow path system of heat pump unit and control method thereof, heat pump unit

Abstract

The application relates to the technical field of heat pump units, in particular to a flow path system of a heat pump unit, a control method of the flow path system and the heat pump unit. The flow path system of the heat pump unit comprises a refrigerant circulation flow path and a heat storage defrosting flow path. The refrigerant circulation flow path is provided with a refrigerant compression component and an outdoor heat exchange component, the refrigerant compression component is provided with a heat conduction component absorbing heat of the refrigerant compression component, and the outdoor heat exchange component has a plurality of flow paths arranged in parallel, and the lowermost flow path in the plurality of flow paths is a first flow path. The heat storage defrosting flow path is connected in parallel with the first flow path, in a heat storage working condition, refrigerant medium in the heat storage defrosting flow path flows through the heat conduction component and absorbs heat of the heat conduction component to perform heat storage; in a defrosting working condition, the refrigerant medium circulates between the heat storage defrosting flow path and the first flow path to transfer heat stored in the heat storage defrosting flow path to the first flow path. The heat stored in this way can act on the first flow path, the defrosting time of the first flow path is shortened, and the phenomenon that the defrosting of the first flow path is not completed can be reduced.

Description

Technical Field

[0001] This application relates to the field of heat pump unit technology, and in particular to a flow path system of a heat pump unit, a heat pump unit, and a control method for the flow path system of a heat pump unit. Background Technology

[0002] Currently, air source heat pump units are increasingly widely used for heating in northern regions. As the most important outdoor heat exchange component in air source heat pump units, the finned tube heat exchanger's heat exchange performance directly affects the unit's heating efficiency and operational reliability.

[0003] During winter heating operation, when the outdoor ambient temperature is low and the air humidity is high, the surface temperature of the outdoor finned heat exchanger will be lower than the dew point temperature of the air. This causes moisture in the air to condense on the fin surface and gradually form frost. As the frost layer thickens, it blocks the airflow channels between the fins of the outdoor finned heat exchanger, increasing airflow resistance and significantly reducing the airflow through the heat exchanger. Furthermore, the extremely low thermal conductivity of the frost layer significantly reduces the overall heat transfer performance of the outdoor finned heat exchanger. These dual effects result in a substantial decrease in the heating capacity of the heat pump unit, a significant reduction in the energy efficiency ratio, and in severe cases, may even lead to shutdowns or malfunctions of the air source heat pump unit.

[0004] Currently, the main defrosting method for existing air source heat pump units is four-way reversing reverse circulation defrosting. This involves switching the refrigerant flow direction via a four-way valve, switching the air source heat pump unit from heating mode to cooling mode, allowing the high-temperature refrigerant to flow through the outdoor finned heat exchanger to melt the frost layer on the fin surface. However, this defrosting method has significant drawbacks in practical applications: during defrosting, the melted frost flows downwards along the fin surface under gravity, causing the frost layer in the upper flow path of the outdoor finned heat exchanger to melt first, while the frost layer in the bottom flow path remains unmelted, resulting in an uneven defrosting phenomenon of "hot at the top and cold at the bottom." If the air source heat pump unit exits cooling mode at this time, the bottom flow path will never be completely defrosted. Waiting for the bottom flow path to completely defrost will significantly prolong the defrosting time and increase the energy consumption of the air source heat pump unit. In addition, if the temperature of the bottom area of ​​the outdoor finned heat exchanger is relatively low and the drainage path is not smooth, the meltwater at the bottom is often difficult to drain smoothly. In low-temperature environments, it is very easy to refreeze at the bottom flow path, thus forming an "ice skirt" or "ice dam" phenomenon, which further reduces the heat exchange efficiency of the air source heat pump unit and increases the energy consumption of the air source heat pump unit. Summary of the Invention

[0005] This application provides a flow path system for a heat pump unit to solve the problems of incomplete defrosting, low defrosting efficiency, and the resulting "ice skirt" or "ice dam" phenomenon in the bottom flow path of existing outdoor finned heat exchangers.

[0006] In a first aspect, this application provides a flow path system for a heat pump unit, comprising a refrigerant circulation flow path and a heat storage defrosting flow path. The refrigerant circulation flow path includes a refrigerant compressor and an outdoor heat exchanger. The refrigerant compressor is equipped with a heat-conducting element that absorbs its heat. The outdoor heat exchanger has multiple flow paths arranged in parallel, with the lowest flow path being the first flow path. The heat storage defrosting flow path is connected in parallel with the first flow path. The inlet end of the heat storage defrosting flow path is connected to the outlet of the heat-conducting element, and the outlet end of the heat storage defrosting flow path is connected to the inlet of the heat-conducting element. The heat storage defrosting flow path has a heat storage mode and a defrosting mode. In the heat storage mode, the cold medium in the heat storage defrosting flow path flows through the heat-conducting component and absorbs its heat to store heat. In the defrosting mode, the cold medium circulates between the heat storage defrosting flow path and the first flow path to transfer the heat stored in the heat storage defrosting flow path to the first flow path.

[0007] Furthermore, the flow path system of the heat pump unit also includes a heat storage device, the heat storage defrosting flow path passes through the heat storage device, and the heat storage device contains a heat storage medium for exchanging heat with the cold medium.

[0008] Furthermore, the heat-conducting element is wound around the refrigerant compressor, and the heat-conducting element is used to absorb the heat of the refrigerant compressor and exchange heat with the refrigerant flowing through it.

[0009] Furthermore, a pump body is also provided in the heat storage defrosting flow path. The pump body is located at the outlet of the heat-conducting component. The pump body is used to drive the cold medium to circulate between the heat-conducting component and the heat storage device when the heat storage defrosting flow path is in the heat storage condition. The pump body is also used to drive the cold medium to circulate between the heat storage device and the first flow path when the heat storage defrosting flow path is in the defrosting condition.

[0010] Furthermore, the two ends of the heat storage defrosting flow path are connected to the first flow path through a first pipeline and a second pipeline, respectively. A first valve body is provided on the first pipeline and a second valve body is provided on the second pipeline. The first valve body and the second valve body are closed when the heat storage defrosting flow path is in the heat storage condition, and the first valve body and the second valve body are open when the heat storage defrosting flow path is in the defrosting condition.

[0011] Furthermore, a third valve body is also provided in the heat storage defrosting flow path. The third valve body is located between the pump body and the heat storage device. The third valve body is open when the heat storage defrosting flow path is in the heat storage condition and closed when the heat storage defrosting flow path is in the defrosting condition.

[0012] Furthermore, the flow path system of the heat pump unit also includes a first temperature sensing element, which is used to collect the temperature of the outdoor environment. When the temperature of the outdoor environment is within a first preset temperature threshold, the heat storage defrosting flow path enters the heat storage mode.

[0013] Furthermore, the heat storage device is provided with a second temperature sensing element, which is used to collect the temperature of the heat storage device. When the temperature of the heat storage device is not lower than a second preset temperature threshold, the heat storage defrosting flow path exits the heat storage condition. The second preset temperature threshold is greater than the first preset temperature threshold.

[0014] Furthermore, a third temperature sensor is provided on the first flow path. The third temperature sensor is used to collect the temperature of the first flow path. When the difference between the outdoor ambient temperature and the temperature of the first flow path is not lower than a third preset temperature threshold, the heat storage defrosting flow path enters the defrosting condition. The third preset temperature threshold is less than the first preset temperature threshold.

[0015] Furthermore, the flow path that is adjacent to and above the first flow path among the multiple flow paths is the second flow path. A fourth temperature sensor is provided on the second flow path. The fourth temperature sensor is used to collect the temperature of the second flow path. When the temperature of the first flow path and the temperature of the second flow path are not lower than a fourth preset temperature threshold, the heat storage defrosting flow path exits the defrosting condition. The fourth preset temperature threshold is greater than the third preset temperature threshold.

[0016] Secondly, this application also provides a heat pump unit, including the flow path system of the heat pump unit as described above.

[0017] Thirdly, this application provides a control method for the flow path system of a heat pump unit, applied to the flow path system of the heat pump unit as described above. The flow path system of the heat pump unit further includes a first temperature sensing element, which is used to collect the temperature of the outdoor environment. The control method includes: The outdoor ambient temperature and the temperature related to the heat storage defrosting flow path are obtained respectively. When the temperature of the outdoor environment is within the first preset temperature threshold, the heat storage defrosting flow path is controlled to enter the heat storage condition. When the temperature related to the heat storage defrosting flow path is not lower than the second preset temperature threshold, the heat storage defrosting flow path is controlled to exit the heat storage condition, where the second preset temperature threshold is greater than the first preset temperature threshold.

[0018] Furthermore, the flow path that is adjacent to and above the first flow path among the plurality of flow paths is the second flow path, and the control method further includes: The temperatures of the first flow path and the second flow path are obtained respectively; When the difference between the outdoor ambient temperature and the temperature of the first flow path is not lower than a third preset temperature threshold, the heat storage defrosting flow path enters the defrosting condition. When the temperatures of the first flow path and the second flow path are not lower than the fourth preset temperature threshold, the heat storage defrosting flow path exits the defrosting condition, and the fourth preset temperature threshold is greater than the third preset temperature threshold.

[0019] The technical solutions provided in this application have the following advantages compared with the prior art: The heat pump unit flow path system of this application, by setting up a heat storage defrosting flow path connected in parallel with the first flow path and utilizing heat-conducting components to recover the operating waste heat of the refrigerant compressor, achieves effective recovery and reuse of heat lost by the refrigerant compressor, significantly improving energy utilization efficiency. Simultaneously, the heat storage defrosting flow path, through switching between heat storage and defrosting modes, can precisely transfer the recovered heat to the first flow path, which is most prone to frost buildup and most difficult to defrost completely, thus solving the problem of uneven defrosting with "hot at the top and cold at the bottom" inherent in traditional reverse defrosting. This flow path design allows the stored heat to be concentrated on the first flow path, significantly shortening the defrosting time of the first flow path, thereby greatly reducing the overall defrosting time of the outdoor heat exchange components. Furthermore, it can reduce the phenomenon of "ice skirts" or "ice dams" gradually accumulating on the first flow path due to incomplete defrosting and refreezing of melted water at low temperatures, effectively improving the heat exchange efficiency of the heat pump unit and reducing its energy consumption. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 The principle of the flow path system of the heat pump unit provided in the embodiments of this application Figure 1 ; Figure 2 The principle of the flow path system of the heat pump unit provided in the embodiments of this application Figure 2 (The refrigerant circulation path is in heating mode). Figure 3 The principle of the flow path system of the heat pump unit provided in the embodiments of this application Figure 3 (The refrigerant circulation path is in refrigeration mode); Figure 4 The principle of the flow path system of the heat pump unit provided in the embodiments of this application Figure 4 (The heat storage defrosting flow path is in heat storage mode); Figure 5 The principle of the flow path system of the heat pump unit provided in the embodiments of this application Figure 5 (The heat storage defrosting flow path is in defrosting mode); Figure 6 A cross-sectional view of the heat storage device provided in the embodiments of this application; Figure 7 A schematic diagram illustrating the assembly of a refrigerant compressor and a heat-conducting component according to an embodiment of this application; Figure 8 A control flowchart of the flow path system of a heat pump unit provided in an embodiment of this application; Figure 9 The flow chart of the control method for the flow path system of the heat pump unit provided in the embodiments of this application Figure 1 ; Figure 10 The flow chart of the control method for the flow path system of the heat pump unit provided in the embodiments of this application Figure 2 .

[0024] Explanation of reference numerals in the attached figures: 1. Refrigerant circulation path; 11. Refrigerant compressor; 111. Heat conduction component; 1111. Inlet; 1112. Outlet; 12. Outdoor heat exchanger; 121. First flow path; 122. Fourth valve body; 123. Fifth valve body; 124. Third temperature sensor; 125. Second flow path; 126. Fourth temperature sensor; 13. Indoor heat exchanger; 14. Four-way valve; 15. Liquid distribution pipe assembly; 16. Gas collection pipe assembly; 17. Throttling valve; 2. Heat storage defrosting flow path; 21. Pump body; 22. Third valve body; 3. Heat storage device; 31. Second temperature sensing element; 4. First pipeline; 41. First valve body; 5. Second pipeline; 51. Second valve body; 6. First temperature sensing element; 7. Heat storage medium. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0027] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0028] To address the problems of incomplete defrosting, low defrosting efficiency, and the resulting "ice skirt" or "ice dam" phenomenon in existing outdoor finned heat exchangers, this application provides a flow path system for a heat pump unit, such as... Figure 1As shown, the flow path system of the heat pump unit includes a refrigerant circulation flow path 1 and a heat storage defrosting flow path 2. The refrigerant circulation flow path 1 is equipped with a refrigerant compressor 11 and an outdoor heat exchanger 12. The refrigerant compressor 11 is equipped with a heat-conducting element 111 that absorbs its heat. The outdoor heat exchanger 12 has multiple flow paths arranged in parallel, with the lowest flow path being the first flow path 121. The heat storage defrosting flow path 2 is connected in parallel with the first flow path 121. The inlet end of the heat storage defrosting flow path 2 is connected to the outlet 1112 of the heat-conducting element 111, and the outlet end of the heat storage defrosting flow path 2 is connected to the inlet 1111 of the heat-conducting element 111. The heat storage defrosting flow path 2 has a heat storage mode and a defrosting mode. In the heat storage mode, the cold medium in the heat storage defrosting flow path 2 flows through the heat-conducting component 111 and absorbs its heat for heat storage. In the defrosting mode, the cold medium circulates between the heat storage defrosting flow path 2 and the first flow path 121 to transfer the heat stored in the heat storage defrosting flow path 2 to the first flow path 121.

[0029] The refrigerant circulation path 1 can contain a circulating refrigerant substance, and the refrigerant compressor 11 can be a power component that drives the refrigerant substance to circulate in the refrigerant circulation path 1 and increases the pressure and temperature of the refrigerant substance.

[0030] The aforementioned refrigerant circulation path 1 can operate in both heating and cooling modes. In heating mode, the outdoor heat exchanger 12 functions as an evaporator, where the low-temperature, low-pressure refrigerant absorbs heat from the outdoor air and evaporates into a gaseous state, thus absorbing heat from the outdoor environment. In cooling mode, the outdoor heat exchanger 12 functions as a condenser, where the high-temperature, high-pressure refrigerant releases heat to the outdoor air and condenses into a liquid state, thus releasing heat to the outdoor environment.

[0031] The aforementioned outdoor heat exchanger 12 can specifically be a finned heat exchanger, which can have multiple flow paths arranged in parallel, such as... Figure 1 As shown, Figure 1The finned heat exchanger shown can have four flow paths, meaning that when the cold medium flows into the finned heat exchanger, it can be evenly distributed into the four flow paths to ensure that the flow rate and evaporation temperature of the cold medium in each flow path remain basically consistent, thereby ensuring the overall heat exchange uniformity and efficiency of the finned heat exchanger. The flow path located at the bottom of the four flow paths can be named the first flow path 121. It can be understood that during the defrosting process of the outdoor heat exchanger 12, because the first flow path 121 is located at the lowest position, the melted frost water will flow down along the surface of the finned heat exchanger under the action of gravity and collect here. Moreover, the heat of the first flow path 121 itself is easily lost due to poor drainage and the influence of low temperature environment. Therefore, the first flow path 121 is the part of the entire finned heat exchanger where the frost layer is the most difficult to remove and the most likely to form an "ice skirt" or "ice dam".

[0032] The aforementioned refrigerant circulation path 1 may also be equipped with an indoor heat exchanger 13, a four-way valve 14, a liquid distribution pipe assembly 15, a gas collection pipe assembly 16, and a throttling valve 17, such as... Figure 2 As shown, when the refrigerant circulation path 1 is in heating mode, the high-temperature, high-pressure refrigerant compressed by the refrigerant compressor 11 first flows through the four-way valve 14, which then guides it to the indoor heat exchanger 13. The indoor heat exchanger 13 can function as a condenser in heating mode, meaning the high-temperature, high-pressure refrigerant releases heat into the room within the indoor heat exchanger 13 and condenses into a high-pressure, medium-temperature liquid refrigerant. The condensed liquid refrigerant can then flow into the throttling valve 17 to reduce its pressure and temperature, preparing it for evaporation and heat absorption in the outdoor heat exchanger 12. After passing through the throttling valve 17, the refrigerant can be evenly distributed through the distributor assembly 15 into multiple parallel flow paths of the finned heat exchanger. As the refrigerant flows through these multiple flow paths, it absorbs heat from the outdoor air and gradually evaporates into a low-pressure gaseous refrigerant, achieving the purpose of absorbing heat from the outdoor environment. The low-pressure gaseous refrigerant, after evaporation in multiple flow paths, can flow out separately and be collected by the gas collection pipe assembly 16. Then, it is redirected and guided by the four-way valve 14 back to the refrigerant compressor 11, thus completing the circulation of the refrigerant in refrigerant circulation path 1 when it is in heating mode. It is understandable that... Figure 2 The direction of the middle arrow indicates the flow direction of the refrigerant in refrigerant circulation path 1 when it is in heating mode. Conversely, if... Figure 3As shown, when the refrigerant circulation path 1 is in cooling mode, the high-temperature, high-pressure gaseous refrigerant, compressed by the refrigerant compressor 11, first flows through the four-way valve 14, which then guides it to the gas collector assembly 16 and the finned heat exchanger. At this time, the finned heat exchanger can function as a condenser in cooling mode; that is, the high-temperature, high-pressure gaseous refrigerant releases heat to the outdoor air in the finned heat exchanger and condenses into a high-pressure, medium-temperature liquid refrigerant. This heat release process also melts the frost layer adhering to the fin surface, achieving the defrosting function. The condensed liquid refrigerant can then flow into the distributor assembly 15 and the throttle valve 17. The throttle valve 17 reduces the pressure and temperature of the refrigerant, preparing it for heat absorption and evaporation in the indoor heat exchanger 13. The low-temperature, low-pressure refrigerant, after passing through the expansion valve 17, enters the indoor heat exchanger 13. At this time, the indoor heat exchanger 13 functions as an evaporator under cooling conditions. The refrigerant absorbs heat from the indoor environment within the indoor heat exchanger 13 and gradually evaporates into a low-pressure gaseous refrigerant. After evaporation, the low-pressure gaseous refrigerant flows out of the indoor heat exchanger 13 and is then redirected by the four-way valve 14 back to the refrigerant compressor 11, thus completing the refrigerant circulation flow path 1 under cooling conditions. It is understandable that... Figure 3 The direction of the middle arrow can be represented as the flow direction of the refrigerant when the refrigerant circulation path 1 is in refrigeration mode.

[0033] The aforementioned heat-conducting component 111 can absorb and store the heat generated by the refrigerant compressor 11 during operation. Specifically, the refrigerant compressor 11 generates heat during operation, which can be dissipated to the surrounding environment through its surface. The heat-conducting component 111 can be disposed on the refrigerant compressor 11 to efficiently absorb this heat that would otherwise be dissipated to the surrounding environment through heat conduction, and to collect and store this heat for subsequent use in heat storage or defrosting conditions. The heat-conducting component 111 can be made of metal materials with excellent thermal conductivity, such as copper, aluminum, and their alloys; this application does not specifically limit its application to this.

[0034] The aforementioned heat storage defrosting flow path 2 can be connected in parallel with the first flow path 121. When the heat storage defrosting flow path 2 is in heat storage mode, the cold medium in the heat storage defrosting flow path 2 can flow through the heat conductor 111 to exchange heat with and absorb the heat from the heat conductor 111. When the heat storage defrosting flow path 2 is in defrosting mode, the cold medium can transfer the absorbed heat to the first flow path 121 through the heat storage defrosting flow path 2 to melt the frost layer attached to the surface of the first flow path 121.

[0035] The heat pump unit flow path system of this application, by setting up a heat storage defrosting flow path 2 connected in parallel with the first flow path 121, and utilizing the heat-conducting component 111 to recover the operating waste heat of the refrigerant compressor 11, achieves effective recovery and reuse of the heat lost by the refrigerant compressor 11, significantly improving energy utilization efficiency. Simultaneously, the heat storage defrosting flow path 2, through switching between heat storage and defrosting modes, can accurately transfer the recovered heat to the first flow path 121, which is most prone to frost accumulation and most difficult to defrost, thus solving the problem of uneven defrosting with "hot at the top and cold at the bottom" inherent in traditional reverse defrosting. This flow path design allows the stored heat to be concentrated on the first flow path 121, significantly shortening the defrosting time of the first flow path 121, thereby greatly reducing the overall defrosting time of the outdoor heat exchanger 12. Furthermore, it can fundamentally eliminate the phenomenon of "ice skirt" or "ice dam" formed by the gradual accumulation of melted water on the first flow path 121 due to incomplete defrosting and refreezing of melted water in a low-temperature environment, effectively improving the heat exchange efficiency of the heat pump unit and reducing the energy consumption of the heat pump unit.

[0036] In some embodiments, such as Figures 1 to 6 As shown, the flow path system of the heat pump unit also includes a heat storage device 3. The heat storage defrosting flow path 2 passes through the heat storage device 3, and the heat storage device 3 contains a heat storage medium 7 for exchanging heat with the cold medium.

[0037] The aforementioned heat storage medium 7 can fill the heat storage device 3, the heat storage defrosting flow path 2 can pass through the heat storage device 3, and part of the pipe of the heat storage defrosting flow path 2 can be located inside the heat storage device 3. For example... Figure 6 As shown, the shape of the pipe in the heat storage device 3 of the above-mentioned heat storage defrosting flow path 2 can be spiral or wavy. This can extend the length of the heat storage defrosting flow path 2 in the heat storage device 3, greatly increase the contact area between the cold medium and the heat storage medium 7, and improve the heat exchange efficiency and heat exchange effect between the cold medium and the heat storage medium 7.

[0038] The heat storage medium 7 is preferably a phase change material. Phase change materials can have a high latent heat of phase change and can absorb or release a large amount of heat, thereby enabling the heat storage device 3 to have a high heat storage density and good temperature maintenance characteristics.

[0039] like Figure 4As shown, when the heat storage defrosting flow path 2 is in heat storage mode, the heat generated by the refrigerant compressor 11 during operation can be transferred to the heat conductor 111 through heat conduction. Thus, as the refrigerant flows through the heat conductor 111, the heat can be further transferred to the refrigerant flowing inside the heat conductor 111. Then, the refrigerant that has absorbed heat can continue to flow along the heat storage defrosting flow path 2, releasing the heat it carries to the heat storage medium 7 filled in the heat storage device 3 as it flows through it. This causes the temperature of the heat storage medium 7 to gradually rise and store the heat. After releasing heat, the temperature of the refrigerant decreases, allowing it to flow out of the heat storage device 3 again and return to the heat conductor 111 to reabsorb heat. This achieves the continuous recovery and transfer of waste heat generated by the refrigerant compressor 11 during operation to the heat storage device 3 for storage. It is understood that... Figure 4 The direction of the middle arrow can be represented as the flow direction of the cold medium when the heat storage defrosting flow path 2 is in heat storage condition.

[0040] like Figure 5 As shown, when the heat storage defrosting flow path 2 is in defrosting mode, the cold medium can flow through the heat storage device 3 to absorb the heat stored in the heat storage medium 7. Then, the heat-absorbing cold medium can continue flowing along the heat storage defrosting flow path 2 to the first flow path 121. When the high-temperature cold medium flows through the first flow path 121, it can release the heat it carries through the pipe wall of the first flow path 121, thereby melting the frost layer adhering to the vicinity of the first flow path 121. The cold medium that has released heat can flow out of the first flow path 121 and return to the heat storage device 3, thus continuously transferring the heat stored in the heat storage device 3 to the first flow path 121. It is understood that... Figure 5 The direction of the middle arrow can be represented as the flow direction of the cold medium in the heat storage defrosting flow path 2 when it is in defrosting condition.

[0041] In the above embodiments, when the heat storage defrosting flow path 2 is in heat storage mode, the heat storage device 3 can collect the waste heat lost to the environment during the operation of the refrigerant compressor 11, avoiding the waste caused by the direct discharge of heat into the surrounding environment. When the heat storage defrosting flow path 2 is in defrosting mode, the heat storage device 3 can serve as a stable heat source, providing continuous and concentrated heat to the first flow path 121, effectively ensuring the defrosting effect and efficiency of the first flow path 121. Furthermore, this heat storage method means that the supply of defrosting heat to the first flow path 121 is no longer completely limited by the operating state of the refrigerant compressor 11. Even when the refrigerant compressor 11 is in a shutdown state, the heat storage device 3 can still independently and continuously supply stable defrosting heat to the first flow path 121, significantly improving the independent control capability and operational reliability of the defrosting process of the first flow path 121.

[0042] In some embodiments, such as Figure 7As shown, the heat-conducting element 111 is wound around the refrigerant compressor 11. The heat-conducting element 111 is used to absorb the heat of the refrigerant compressor 11 and exchange heat with the refrigerant flowing through it.

[0043] The heat-conducting element 111 can be spiral in shape. The spiral heat-conducting element 111 can be tightly wound around the outer peripheral wall of the refrigerant compressor 11 and form direct contact with the surface of the refrigerant compressor 11. This can significantly increase the contact area between the heat-conducting element 111 and the refrigerant compressor 11, thereby improving the heat exchange efficiency between the two.

[0044] When the refrigerant compressor 11 is in operation, the upper part of the refrigerant compressor 11 corresponds to the area where its internal motor is located and the area where the high-temperature refrigerant is discharged, thus the temperature of the upper part of the refrigerant compressor 11 is relatively high. The lower part of the refrigerant compressor 11 corresponds to the compression chamber area of ​​the refrigerant compressor 11, thus the temperature of the lower part of the refrigerant compressor 11 is relatively low. Based on this, as Figure 7 As shown, the inlet 1111 of the heat-conducting component 111 can be set at the upper part of the refrigerant compressor 11, and the outlet 1112 of the heat-conducting component 111 can be set at the lower part of the refrigerant compressor 11, so that after the refrigerant flows into the heat-conducting component 111, it can exchange heat with the high-temperature area at the upper part of the refrigerant compressor 11 in a timely manner, which is conducive to the rapid rise of the temperature of the refrigerant.

[0045] In the above embodiment, the heat-conducting element 111 is wound around the refrigerant compressor 11 to ensure sufficient contact area between the heat-conducting element 111 and the refrigerant compressor 11. This allows for more complete absorption and utilization of the waste heat generated during the operation of the refrigerant compressor 11, effectively improving the heat transfer efficiency from the refrigerant compressor 11 to the refrigerant flowing through the heat-conducting element 111. Furthermore, this winding arrangement does not alter the internal structure of the refrigerant compressor 11, requires no modification to the refrigerant compressor 11, is easy to install on existing refrigerant compressors, and facilitates subsequent maintenance, demonstrating good practicality.

[0046] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, a pump body 21 is also provided on the heat storage defrosting flow path 2. The pump body 21 is located at the outlet 1112 of the heat conduction component 111. The pump body 21 is used to drive the cold medium to circulate between the heat conduction component 111 and the heat storage device 3 when the heat storage defrosting flow path 2 is in the heat storage condition. The pump body 21 is also used to drive the cold medium to circulate between the heat storage device 3 and the first flow path 121 when the heat storage defrosting flow path 2 is in the defrosting condition.

[0047] The aforementioned pump body 21 can provide a circulating driving force for the cold medium within the heat storage defrosting flow path 2. Specifically, when the heat storage defrosting flow path 2 is in heat storage mode, the pump body 21 can drive the cold medium to continuously circulate between the heat-conducting component 111 and the heat storage device 3, allowing the cold medium to sequentially flow through the heat-conducting component 111 to absorb the residual heat of the refrigerant compressor 11, and then flow through the heat storage device 3 to release the heat to the heat storage medium 7, thus realizing a continuous unidirectional transfer of heat from the refrigerant compressor 11 to the heat storage device 3. When the heat storage defrosting flow path 2 is in defrosting mode, the pump body 21 can drive the cold medium to continuously circulate between the heat storage device 3 and the first flow path 121, allowing the cold medium to sequentially flow through the heat storage device 3 to absorb the heat stored in the heat storage medium 7, and then transfer the heat to the first flow path 121 via the heat storage defrosting flow path 2, thus realizing a continuous directional transfer of heat from the heat storage device 3 to the first flow path 121.

[0048] In the above embodiment, a pump body 21 can be installed on the heat storage defrosting flow path 2 to provide driving force for the circulation of the cold medium, ensuring that the heat storage defrosting flow path 2 can achieve independent circulation of the cold medium in both heat storage and defrosting conditions. That is, in the heat storage condition, the pump body 21 can drive the cold medium to circulate between the heat-conducting component 111 and the heat storage device 3 to recover and store the waste heat of the cold medium compressor 11. In the defrosting condition, the pump body 21 can drive the cold medium to circulate between the heat storage device 3 and the first flow path 121, accurately delivering the heat stored in the heat storage device 3 to the first flow path 121. Thus, the circulation flow rate of the cold medium can remain stable and reliable under different operating conditions. At the same time, by adjusting the speed or starting and stopping of the pump body 21, the flow rate and heat exchange efficiency of the cold medium can be flexibly adjusted to meet the heat storage or defrosting requirements under different operating conditions, significantly improving the control flexibility and operating accuracy of the heat pump unit.

[0049] In some embodiments, such as Figures 1 to 5 As shown, the two ends of the heat storage defrosting flow path 2 are connected to the first flow path 121 through the first pipe 4 and the second pipe 5 respectively. The first pipe 4 is provided with a first valve body 41 and the second pipe 5 is provided with a second valve body 51. The first valve body 41 and the second valve body 51 are closed when the heat storage defrosting flow path 2 is in the heat storage condition, and the first valve body 41 and the second valve body 51 are open when the heat storage defrosting flow path 2 is in the defrosting condition.

[0050] A fourth valve body 122 and a fifth valve body 123 can be respectively installed on the first flow path 121. The fourth valve body 122 can be located between the liquid distribution pipe assembly 15 and the outdoor heat exchanger 12, and the fifth valve body 123 can be located between the gas collection pipe assembly 16 and the outdoor heat exchanger 12. When the refrigerant circulation flow path 1 is in heating or cooling mode, the fourth valve body 122 and the fifth valve body 123 can be in the open state to allow the refrigerant to flow normally into and out of the first flow path 121 and participate in the heat exchange of the outdoor heat exchanger 12.

[0051] When the heat storage defrosting flow path 2 is in heat storage mode, the first valve body 41 and the second valve body 51 can be in the closed state to cut off the connection between the heat storage defrosting flow path 2 and the first flow path 121, preventing the refrigerant from flowing into the first flow path 121 of the outdoor heat exchanger during the heat storage process. When the heat storage defrosting flow path 2 is in defrosting mode, the first valve body 41 and the second valve body 51 can be in the open state, while the fourth valve body 122 and the fifth valve body 123 can be in the closed state, so that the first flow path 121 and the heat storage defrosting flow path 2 form an independent circulation loop. This circulation loop can be isolated from the refrigerant circulation flow path 1 and do not interfere with each other. Thus, while ensuring that the refrigerant can flow to the first flow path 121, it can also prevent the refrigerant from flowing to the liquid distribution pipe assembly 15 or the gas collection pipe assembly 16 via the first flow path 121. The aforementioned first valve body 41, second valve body 51, fourth valve body 122 and fifth valve body 123 can specifically be solenoid valves.

[0052] In the above embodiment, the controllable switching between the heat storage defrosting flow path 2 and the first flow path 121 can be achieved through the first valve body 41 and the second valve body 51. That is, in heat storage mode, the first valve body 41 and the second valve body 51 can be closed simultaneously to completely isolate the heat storage defrosting flow path 2 from the first flow path 121, effectively preventing the cold medium after absorbing heat from flowing to the outdoor heat exchanger 12, thus avoiding unnecessary heat loss and ensuring the heat storage efficiency of the heat storage device 3. In defrosting mode, the first valve body 41 and the second valve body 51 can be opened simultaneously, allowing the heat from the heat storage device 3 to be quickly transferred to the first flow path 121, realizing flexible switching between heat storage and defrosting modes, and effectively improving the flexibility and convenience of switching the flow path system of the heat pump unit.

[0053] In some embodiments, such as Figures 1 to 5 As shown, a third valve body 22 is also provided on the heat storage defrosting flow path 2. The third valve body 22 is located between the pump body 21 and the heat storage device 3. The third valve body 22 is opened when the heat storage defrosting flow path 2 is in heat storage mode and closed when the heat storage defrosting flow path 2 is in defrosting mode.

[0054] When the heat storage defrosting flow path 2 is in heat storage mode, the third valve body 22 can be in the open state to connect the pump body 21 and the heat storage device 3. This allows the cold medium to flow smoothly from the heat-conducting component 111 under the drive of the pump body 21 into the heat storage device 3 via the third valve body 22, thereby completing the heat storage. When the heat storage defrosting flow path 2 is in defrosting mode, the third valve body 22 can be in the closed state to cut off the connection between the pump body 21 and the heat storage device 3. This allows the cold medium to flow only into the first flow path 121 through the second pipe 5, and then out through the first flow path 121 via the first pipe 4, ensuring that all the stored heat can be used to melt the frost layer in the first flow path 121. Specifically, the third valve body 22 can be a solenoid valve.

[0055] In the above embodiment, a third valve 22 can be provided between the pump body 21 and the heat storage device 3. During heat storage, the third valve 22 can be in an open state to ensure that the cold medium can flow smoothly from the pump body 21 to the heat storage device 3, thereby completing heat recovery and storage. During defrosting, the third valve 22 can be in a closed state, which can forcibly cut off the direct connection between the heat storage device 3 and the pump body 21, guiding the cold medium to the first flow path 121 of the outdoor heat exchanger 12. This ensures that all the defrosting heat can be concentratedly delivered to the first flow path 121, effectively improving the utilization efficiency of the stored heat and ensuring that the frost layer on the first flow path 121 melts quickly and completely.

[0056] In some embodiments, such as Figures 1 to 5 As shown, the flow path system of the heat pump unit also includes a first temperature sensing element 6, which is used to collect the temperature of the outdoor environment. When the temperature of the outdoor environment is within the first preset temperature threshold, the heat storage defrosting flow path 2 enters the heat storage mode.

[0057] like Figures 1 to 5 As shown, the first temperature sensing element 6 can be disposed on the outdoor heat exchanger 12 to detect the temperature of the environment in which the outdoor heat exchanger 12 is located. The first temperature sensing element 6 can be a defrost temperature sensing bulb, a surface-mount thermistor, an NTC temperature probe, a thermocouple sensor, etc., and this application does not specifically limit it.

[0058] When the outdoor ambient temperature exceeds the first preset temperature threshold, it can be understood that the outdoor temperature is relatively high. The evaporation temperature of the outdoor heat exchanger 12 is generally not lower than the dew point temperature of the air, so the outdoor heat exchanger 12 is unlikely to frost. Therefore, the heat storage defrosting path 2 does not need to enter the heat storage mode. However, when the outdoor ambient temperature is within the first preset temperature threshold, it can be understood that the outdoor temperature has dropped to a range where frost may occur. Under these temperature conditions, the evaporation temperature of the outdoor heat exchanger 12 is likely to be lower than the dew point temperature of the air, causing moisture in the air to condense on the surface of the outdoor heat exchanger 12 and gradually frost over. Therefore, the heat storage defrosting path 2 can enter the heat storage mode to recover and store the waste heat of the refrigerant compressor 11 in a timely manner, providing heat reserves for subsequent defrosting. The value range of the aforementioned first preset temperature threshold can be greater than or equal to 12 degrees Celsius and less than or equal to 18 degrees Celsius.

[0059] In the above embodiment, the outdoor temperature is monitored by setting the first temperature sensing element 6, and the outdoor temperature is used as the basis for determining whether to enter the heat storage mode. That is, the heat storage defrosting flow path 2 will enter the heat storage mode when the outdoor temperature drops to within the first preset temperature threshold, thus avoiding unnecessary heat storage operation in a high-temperature frost-free environment and realizing the automated and intelligent start-up of the heat storage mode.

[0060] In some embodiments, such as Figures 1 to 5 As shown, a second temperature sensor 31 is provided on the heat storage device 3. The second temperature sensor 31 is used to collect the temperature of the heat storage device 3. When the temperature of the heat storage device 3 is not lower than the second preset temperature threshold, the heat storage defrosting flow path 2 exits the heat storage condition. The second preset temperature threshold is greater than the first preset temperature threshold.

[0061] The second temperature sensing element 31 mentioned above can be a defrosting temperature sensing bulb, a surface-mount thermistor, an NTC temperature probe, a thermocouple sensor, etc., and this application does not make any specific limitations on it.

[0062] After the refrigerant circulation path 1 has been in heating mode for a preset time, sufficient heat has accumulated on the surface of the refrigerant compressor 11. At this time, the temperature of the heat storage device 3 can be collected by the second temperature sensor 31 to determine the progress of the heat storage operation. Specifically, when the temperature of the heat storage device 3 is within the second preset temperature threshold, it can be determined that the heat storage medium 7 in the heat storage device 3 still has room to continue absorbing heat and has not yet reached the heat storage saturation state. At this time, the heat storage defrosting path 2 can continue to operate in the heat storage mode. When the temperature of the heat storage device 3 is not lower than the second preset temperature threshold, it is determined that the heat storage medium 7 in the heat storage device 3 has reached or exceeded the predetermined heat storage temperature, and the heat storage is sufficient. At this time, the heat storage defrosting path 2 can exit the heat storage mode to avoid excessive heat storage and heat damage to the heat storage medium 7. The preset time can range from 5 minutes to 20 minutes, and the second preset temperature threshold can range from greater than or equal to 50 degrees Celsius to less than or equal to 70 degrees Celsius.

[0063] In the above embodiment, the temperature of the heat storage device 3 is monitored by setting a second temperature sensing element 31, and the temperature of the heat storage device 3 is used as the basis for determining whether to exit the heat storage mode. That is, when the temperature of the heat storage device 3 reaches or exceeds the second preset temperature threshold, it indicates that the heat stored in the heat storage device 3 is saturated or sufficient to meet the subsequent defrosting requirements. At this time, the heat storage defrosting flow path 2 can exit the heat storage mode to avoid the heat storage medium being too hot and causing thermal damage to the heat storage medium, effectively improving the reliability and safety of the flow path system of the heat pump unit.

[0064] In some embodiments, such as Figures 1 to 5 As shown, a third temperature sensor 124 is provided on the first flow path 121. The third temperature sensor 124 is used to collect the temperature of the first flow path 121. When the difference between the outdoor ambient temperature and the temperature of the first flow path 121 is not lower than the third preset temperature threshold, the heat storage defrosting flow path 2 enters the defrosting state. The third preset temperature threshold is less than the first preset temperature threshold.

[0065] The aforementioned third temperature sensing element 124 may be a defrosting temperature sensing bulb, a surface-mount thermistor, an NTC temperature probe, a thermocouple sensor, etc., and this application does not make any specific limitations on it.

[0066] When the heat storage defrosting flow path 2 is in heat storage mode, the temperature of the first flow path 121 can be collected using the third temperature sensor 124. When the difference between the outdoor ambient temperature and the temperature of the first flow path 121 is lower than the third preset temperature threshold, it can be understood that the evaporation temperature of the first flow path 121 is relatively high, and its surface has not yet frost or the frost layer is very thin. At this time, there is no need to enter the defrosting mode. However, when the difference between the outdoor ambient temperature and the temperature of the first flow path 121 is not lower than the third preset temperature threshold, it indicates that the evaporation temperature of the first flow path 121 is significantly lower than the outdoor ambient temperature, and the frost layer on its surface has accumulated to a certain extent and seriously affected the heat exchange efficiency of the outdoor heat exchanger 12. At this time, the defrosting mode can be entered to melt the frost layer on the surface of the first flow path 121. The value range of the aforementioned third preset temperature threshold can be greater than or equal to 6 degrees Celsius and less than or equal to 12 degrees Celsius.

[0067] In the above embodiment, the temperature of the first flow path 121 is monitored by setting a third temperature sensing element 124, and the temperature of the first flow path 121 is used as the basis for determining whether to enter the defrosting condition. When the difference between the outdoor ambient temperature and the temperature of the first flow path 121 is not lower than a third preset temperature threshold, it indicates that the evaporation temperature of the first flow path 121 is too low relative to the outdoor ambient temperature, frost has accumulated and affects the heat exchange efficiency of the outdoor heat exchanger 12, and at this time, the heat storage defrosting flow path 2 can enter the defrosting condition. It can be understood that the above-mentioned judgment method based on the difference between the outdoor ambient temperature and the temperature of the first flow path 121 can more accurately reflect the frosting state of the first flow path 121 and effectively ensure the timeliness of the heat storage defrosting flow path 2 entering the defrosting condition.

[0068] In some embodiments, such as Figures 1 to 5 As shown, the flow path that is adjacent to and above the first flow path 121 among the multiple flow paths is the second flow path 125. A fourth temperature sensor 126 is provided on the second flow path 125. The fourth temperature sensor 126 is used to collect the temperature of the second flow path 125. When the temperature of the first flow path 121 and the temperature of the second flow path 125 are not lower than the fourth preset temperature threshold, the heat storage defrosting flow path 2 exits the defrosting state. The fourth preset temperature threshold is greater than the third preset temperature threshold.

[0069] The aforementioned fourth temperature sensing element 126 may be a defrosting temperature sensing bulb, a surface-mount thermistor, an NTC temperature probe, a thermocouple sensor, etc., and this application does not make any specific limitations on it.

[0070] When the heat storage defrosting flow path 2 is in defrosting mode, the temperature of the second flow path 125 can be collected by the fourth temperature sensor 126. When the temperatures of the first flow path 121 and the second flow path 125 are not lower than the fourth preset temperature threshold, it can be understood that the temperatures of the first flow path 121 and the second flow path 125 are both relatively high, and the frost layer on the first flow path 121 and the second flow path 125 has melted. At this time, the heat storage defrosting flow path 2 can exit the defrosting mode. The value range of the above-mentioned fourth preset temperature threshold can be greater than or equal to 10 degrees Celsius and less than or equal to 20 degrees Celsius.

[0071] It is understandable that by setting a fourth temperature sensor 126 on the second flow path 125 and using the temperature of the second flow path 125 as one of the criteria for exiting the defrosting state, it is possible to avoid the situation where, if the second flow path 125 is still at a low temperature while the first flow path 121 is defrosting, the temperature difference between the two will neutralize, causing the heat required for defrosting in the first flow path 121 to be carried away by the low-temperature portion of the second flow path 125. Therefore, the defrosting state can only be exited when the temperatures of both the first flow path 121 and the second flow path 125 are not lower than the fourth preset temperature threshold. This ensures that both the first flow path 121 and the second flow path 125 have been completely defrosted and their temperatures have risen synchronously, effectively guaranteeing the defrosting efficiency and effect of the first flow path 121.

[0072] In the above embodiment, the temperature of the second flow path 125 is monitored by setting a fourth temperature sensing element 126, and the temperature of the first flow path 121 and the temperature of the second flow path 125 are used together as the basis for determining whether to exit the defrosting condition, so as to avoid the problem of incomplete defrosting caused by only monitoring the temperature of the first flow path 121, and effectively ensure the thoroughness of defrosting of the outdoor heat exchanger 12 when the heat storage defrosting flow path 2 is in the defrosting condition.

[0073] The control flow of the heat pump unit's flow path system can be briefly explained below: For example... Figure 8 As shown, after the heat pump unit is started, it can first be determined whether the refrigerant circulation path 1 is in heating mode. If the determination result is no, the refrigerant circulation path 1 can enter cooling mode; if the determination result is yes, after the refrigerant circulation path 1 has been running continuously for a predetermined time, the heat storage defrosting path 2 can enter heat storage mode. After the heat storage defrosting path 2 has entered heat storage mode and run for a certain period of time, it can enter defrosting mode. After the heat storage defrosting path 2 has been running in defrosting mode for a certain period of time, it can be further determined whether the heat storage defrosting path 2 needs to exit defrosting mode. If the determination result is no, the defrosting mode of the heat storage defrosting path 2 can be maintained; if the determination result is yes, the refrigerant circulation path 1 can enter heating mode, and after running in heating mode for a certain period of time, the heat storage defrosting path 2 can re-enter heat storage mode.

[0074] This application also provides a heat pump unit, including the flow path system of the heat pump unit as described above.

[0075] The heat pump unit of this application includes the flow path system of the heat pump unit as described above. Since the flow path system of the heat pump unit has the beneficial effects described above, the heat pump unit including the flow path system described above must also have the beneficial effects described above.

[0076] This application further provides a control method for the flow path system of a heat pump unit, applied to the flow path system of the heat pump unit as described above. The flow path system of the heat pump unit also includes a first temperature sensing element 6, which is used to collect the temperature of the outdoor environment, such as... Figure 9 As shown, the control method includes steps S110 to S130.

[0077] Step S110: Obtain the outdoor ambient temperature and the temperature related to the heat storage defrosting flow path 2, respectively.

[0078] The aforementioned heat storage defrosting flow path 2 can be installed on the heat storage device 3. The heat storage device 3 can be equipped with a second temperature sensing element 31. The second temperature sensing element 31 can be used to collect the temperature of the heat storage device 3 and use the temperature of the heat storage device 3 as the temperature related to the heat storage defrosting flow path 2.

[0079] Step S120: When the outdoor ambient temperature is within the first preset temperature threshold, control the heat storage defrosting flow path 2 to enter the heat storage mode.

[0080] Step S130: When the temperature related to the heat storage defrosting flow path 2 is not lower than the second preset temperature threshold, control the heat storage defrosting flow path 2 to exit the heat storage condition. The second preset temperature threshold is greater than the first preset temperature threshold.

[0081] The control method for the flow path system of the heat pump unit in this application monitors the outdoor ambient temperature by setting a first temperature sensor 6, and uses the outdoor ambient temperature as the basis for determining whether to enter the heat storage mode. That is, the heat storage defrosting flow path 2 will only enter the heat storage mode when the outdoor ambient temperature drops to within a first preset temperature threshold, avoiding unnecessary heat storage operation in high-temperature frost-free environments and realizing the automated and intelligent start-up of the heat storage mode. Furthermore, when the temperature related to the heat storage defrosting flow path 2 reaches or exceeds a second preset temperature threshold, it indicates that the heat stored in the heat storage defrosting flow path 2 has been saturated or is sufficient to meet the subsequent defrosting needs. At this time, the heat storage defrosting flow path 2 can exit the heat storage mode, effectively improving the intelligence and automation of the heat pump unit's flow path system operation.

[0082] In some embodiments, the flow path that is adjacent to and above the first flow path 121 among the plurality of flow paths is the second flow path 125, such as... Figure 10As shown, the control method further includes steps S210 to S230.

[0083] Step S210: Obtain the temperature of the first flow path 121 and the temperature of the second flow path 125 respectively.

[0084] Step S220: When the difference between the outdoor ambient temperature and the temperature of the first flow path 121 is not lower than the third preset temperature threshold, the heat storage defrosting flow path 2 enters the defrosting mode.

[0085] Step S230: When the temperature of the first flow path 121 and the temperature of the second flow path 125 are not lower than the fourth preset temperature threshold, the heat storage defrosting flow path 2 exits the defrosting condition, and the fourth preset temperature threshold is greater than the third preset temperature threshold.

[0086] In the above embodiment, when the temperature difference between the outdoor environment and the temperature of the first flow path 121 is not lower than the third preset temperature threshold, it indicates that the evaporation temperature of the first flow path 121 is too low relative to the outdoor environment temperature, frost has accumulated and affects the heat exchange efficiency of the outdoor heat exchanger 12, and the heat storage defrosting flow path 2 can enter the defrosting state. When the temperatures of the first flow path 121 and the second flow path 125 are not lower than the fourth preset temperature threshold, it indicates that the temperatures of the first flow path 121 and the second flow path 125 are high, and the frost on the first flow path 121 and the second flow path 125 has melted, and the heat storage defrosting flow path 2 can exit the defrosting state. By using the temperatures of the first flow path 121 and the second flow path 125 together as the basis for determining whether to exit the defrosting state, the problem of incomplete defrosting caused by only monitoring the temperature of the first flow path 121 is avoided, effectively ensuring the thoroughness of defrosting of the outdoor heat exchanger 12 when the heat storage defrosting flow path 2 is in the defrosting state.

[0087] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0088] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0089] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A flow path system for a heat pump unit, characterized in that, include: A refrigerant circulation path is provided, wherein a refrigerant compressor and an outdoor heat exchanger are provided on the refrigerant compressor, a heat-conducting element is provided on the refrigerant compressor to absorb its heat, and the outdoor heat exchanger has multiple flow paths arranged in parallel, wherein the lowest flow path among the multiple flow paths is the first flow path. A heat storage defrosting flow path is provided, wherein the heat storage defrosting flow path is connected in parallel with the first flow path, the liquid inlet of the heat storage defrosting flow path is connected to the outlet of the heat-conducting component, and the liquid outlet of the heat storage defrosting flow path is connected to the inlet of the heat-conducting component. The heat storage defrosting flow path has a heat storage mode and a defrosting mode. In the heat storage mode, the cold medium in the heat storage defrosting flow path flows through the heat-conducting component and absorbs its heat to store heat. In the defrosting mode, the cold medium circulates between the heat storage defrosting flow path and the first flow path to transfer the heat stored in the heat storage defrosting flow path to the first flow path.

2. The flow path system of the heat pump unit according to claim 1, characterized in that, The flow path system of the heat pump unit also includes a heat storage device, and the heat storage defrosting flow path passes through the heat storage device. The heat storage device contains a heat storage medium for exchanging heat with the cold medium.

3. The flow path system of the heat pump unit according to claim 1, characterized in that, The heat-conducting element is wound around the refrigerant compressor, and the heat-conducting element is used to absorb the heat of the refrigerant compressor and exchange heat with the refrigerant flowing through it.

4. The flow path system of the heat pump unit according to claim 2, characterized in that, A pump body is also provided in the heat storage defrosting flow path. The pump body is located at the outlet of the heat-conducting component. The pump body is used to drive the cold medium to circulate between the heat-conducting component and the heat storage device when the heat storage defrosting flow path is in the heat storage condition. The pump body is also used to drive the cold medium to circulate between the heat storage device and the first flow path when the heat storage defrosting flow path is in the defrosting condition.

5. The flow path system of the heat pump unit according to claim 1, characterized in that, The two ends of the heat storage defrosting flow path are connected to the first flow path through the first pipeline and the second pipeline, respectively. The first pipeline is provided with a first valve body and the second pipeline is provided with a second valve body. The first valve body and the second valve body are closed when the heat storage defrosting flow path is in the heat storage condition and open when the heat storage defrosting flow path is in the defrosting condition.

6. The flow path system of the heat pump unit according to claim 4, characterized in that, A third valve body is also provided in the heat storage defrosting flow path. The third valve body is located between the pump body and the heat storage device. The third valve body is open when the heat storage defrosting flow path is in the heat storage condition and closed when the heat storage defrosting flow path is in the defrosting condition.

7. The flow path system of the heat pump unit according to claim 2, characterized in that, The flow path system of the heat pump unit also includes a first temperature sensing element, which is used to collect the temperature of the outdoor environment. When the temperature of the outdoor environment is within a first preset temperature threshold, the heat storage defrosting flow path enters the heat storage condition.

8. The flow path system of the heat pump unit according to claim 7, characterized in that, The heat storage device is equipped with a second temperature sensor, which is used to collect the temperature of the heat storage device. When the temperature of the heat storage device is not lower than a second preset temperature threshold, the heat storage defrosting flow path exits the heat storage condition. The second preset temperature threshold is greater than the first preset temperature threshold.

9. The flow path system of the heat pump unit according to claim 7, characterized in that, A third temperature sensor is provided on the first flow path. The third temperature sensor is used to collect the temperature of the first flow path. When the difference between the outdoor ambient temperature and the temperature of the first flow path is not lower than a third preset temperature threshold, the heat storage defrosting flow path enters the defrosting condition. The third preset temperature threshold is less than the first preset temperature threshold.

10. The flow path system of the heat pump unit according to claim 9, characterized in that, The flow path that is adjacent to and above the first flow path among the multiple flow paths is the second flow path. A fourth temperature sensor is provided on the second flow path. The fourth temperature sensor is used to collect the temperature of the second flow path. When the temperature of the first flow path and the temperature of the second flow path are not lower than a fourth preset temperature threshold, the heat storage defrosting flow path exits the defrosting condition. The fourth preset temperature threshold is greater than the third preset temperature threshold.

11. A heat pump unit, characterized in that, Includes the flow path system of the heat pump unit as described in any one of claims 1 to 10.

12. A control method for the flow path system of a heat pump unit, characterized in that, The flow path system of the heat pump unit as described in any one of claims 1 to 10 further includes a first temperature sensing element for acquiring the temperature of the outdoor environment, and the control method includes: The outdoor ambient temperature and the temperature related to the heat storage defrosting flow path are obtained respectively. When the temperature of the outdoor environment is within the first preset temperature threshold, the heat storage defrosting flow path is controlled to enter the heat storage condition. When the temperature related to the heat storage defrosting flow path is not lower than the second preset temperature threshold, the heat storage defrosting flow path is controlled to exit the heat storage condition, where the second preset temperature threshold is greater than the first preset temperature threshold.

13. The control method for the flow path system of a heat pump unit according to claim 12, characterized in that, The flow path that is adjacent to and above the first flow path among the plurality of flow paths is the second flow path, and the control method further includes: The temperatures of the first flow path and the second flow path are obtained respectively; When the difference between the outdoor ambient temperature and the temperature of the first flow path is not lower than a third preset temperature threshold, the heat storage defrosting flow path enters the defrosting condition. When the temperatures of the first flow path and the second flow path are not lower than the fourth preset temperature threshold, the heat storage defrosting flow path exits the defrosting condition, and the fourth preset temperature threshold is greater than the third preset temperature threshold.

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