A heat pump unit

Abstract

The application provides a heat pump unit, comprising: a bottom plate and an air-side heat exchanger; the bottom plate is provided with a heat exchanger mounting area, the air-side heat exchanger is mounted on the bottom plate and located in the heat exchanger mounting area, and at least part of the bottom of the air-side heat exchanger is in contact with the bottom plate to heat the bottom plate by using the air-side heat exchanger in a defrosting mode. According to the scheme, at least part of the bottom of the air-side heat exchanger is in contact with the bottom plate, so that the heat of the air-side heat exchanger used as a condenser in the defrosting mode can be conducted to the bottom plate, thereby playing a heating effect on the bottom plate to improve the temperature of the bottom plate, so that it is difficult for defrosting water to freeze on the bottom plate, thereby facilitating smooth drainage of the bottom plate and reducing the risk of expansion and cracking of the bottom plate caused by ice accumulation. Moreover, compared with the scheme of additionally arranging an electric heating element to heat the bottom plate, the scheme fully utilizes the heat of the air-side heat exchanger itself to heat the bottom plate, and has good energy-saving effect.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of heating equipment technology, specifically referring to a heat pump unit. Background Technology

[0002] When a heat pump unit operates in a low-temperature environment, the chassis temperature is also relatively low, causing defrost water dripping onto the chassis during defrost mode to easily freeze, leading to poor drainage. Furthermore, the ice layer will accumulate on the chassis, which may cause the two heat exchangers (air-side heat exchanger and water-side heat exchanger) to crack, resulting in the failure of the entire unit. Utility Model Content

[0003] The technical problem to be solved by this application is to provide a heat pump unit that facilitates smooth drainage of the chassis in low-temperature environments.

[0004] This application provides a heat pump unit, including: a chassis and an air-side heat exchanger; the chassis has a heat exchanger mounting area, the air-side heat exchanger is mounted on the chassis and located in the heat exchanger mounting area, and at least a portion of the bottom of the air-side heat exchanger is in contact with the chassis, so as to heat the chassis using the air-side heat exchanger in defrosting mode.

[0005] The heat pump unit provided in this application embodiment, by having at least a portion of the bottom of the air-side heat exchanger in contact with the chassis, allows the heat from the air-side heat exchanger, which acts as a condenser in defrosting mode, to be conducted to the chassis. This heats the chassis, raising its temperature and preventing defrost water from freezing. This facilitates smooth drainage from the chassis and reduces the risk of ice buildup causing the heat exchangers to crack. Furthermore, compared to solutions that require additional electric heating elements to heat the chassis, this solution fully utilizes the heat from the air-side heat exchanger itself, resulting in better energy savings.

[0006] Based on the above technical solution, the following improvements can be made to this application.

[0007] In some exemplary embodiments, the chassis is provided with a drain trough for collecting liquid dripping from the air-side heat exchanger, the drain trough having at least one drain hole, and at least a portion of the projection of the drain trough onto the chassis coincides with the projection of the heat exchanger mounting area onto the chassis.

[0008] The drain hole facilitates the timely discharge of liquid collected in the drain tank. At least a portion of the projection of the drain tank onto the chassis coincides with the projection of the heat exchanger mounting area onto the chassis, allowing liquid on the air-side heat exchanger to drip directly into the drain tank without flowing from other parts of the chassis, thereby improving drainage efficiency.

[0009] In some exemplary embodiments, the air-side heat exchanger includes a first heat exchange section, a second heat exchange section, and a third heat exchange section arranged sequentially along the length of the heat exchanger mounting area. The third heat exchange section is bent relative to the first heat exchange section, and the second heat exchange section is smoothly connected to the first and third heat exchange sections. The heat exchanger mounting area includes a first mounting area, a second mounting area, and a third mounting area. The first heat exchange section is mounted in the first mounting area, the second heat exchange section is mounted in the second mounting area, and the third heat exchange section is mounted in the third mounting area. The second mounting area is provided with a boss for supporting the air-side heat exchanger. A portion of the drainage groove is located within the second mounting area, and at least a portion of the bottom of the second heat exchange section contacts the chassis.

[0010] The boss is in direct contact with the air-side heat exchanger, and defrost water easily drips onto the boss and remains there at least partially, making the boss area more prone to freezing. Therefore, by placing a portion of the drain channel within the second mounting area, and ensuring that at least a portion of the bottom of the second heat exchange section is in contact with the chassis, the second mounting area can be effectively heated, reducing the risk of the boss freezing and facilitating the rapid drainage of defrost water from the second mounting area.

[0011] In some exemplary embodiments, the drainage channel includes a first drainage section, a second drainage section, and a third drainage section arranged sequentially along the length of the drainage channel; the first drainage section is located below the first heat exchanger and is configured to collect liquid dripping from the first heat exchanger; the second drainage section is located below the second heat exchanger and is configured to collect liquid dripping from the second heat exchanger; the third drainage section is located below the third heat exchanger and is configured to collect liquid dripping from the third heat exchanger; at least a portion of the second drainage section is located within the second mounting area.

[0012] In this way, defrosting water dripping from various parts of the air-side heat exchanger can quickly enter the drain trough and be discharged without having to travel a long path on the chassis before entering the drain trough. This helps to improve the drainage efficiency of the chassis and also helps to reduce the risk of chassis icing.

[0013] In some exemplary embodiments, the extension direction of the first drainage section is parallel to the extension direction of the first heat exchanger, and the extension direction of the third drainage section is parallel to the extension direction of the third heat exchanger; at least a portion of the first drainage section is located inside the thickness direction of the first heat exchanger, and at least a portion of the third drainage section is located inside the thickness direction of the third heat exchanger; the second drainage section includes a first inclined section and a second inclined section, one end of the first inclined section is connected to the first drainage section, and the other end of the first inclined section extends inclinedly away from the first drainage section and the third drainage section; one end of the second inclined section is connected to the third drainage section; the other end of the second inclined section extends inclinedly away from the first drainage section and the third drainage section, and is connected to the first inclined section.

[0014] This reduces the overlap between the drainage trough and the heat exchanger installation area, which increases the contact area between the air-side heat exchanger and the chassis, thereby improving the heating effect of the air-side heat exchanger on the chassis during defrosting mode. On the other hand, it ensures that at least part of the second drainage section is located within the second installation area, which reduces the risk of ice formation on the bosses in the second installation area and facilitates the rapid discharge of defrosting water from the second installation area.

[0015] In some exemplary embodiments, the length of the first heat exchange section is greater than the length of the third heat exchange section, the length of the first drainage section is greater than the length of the third drainage section, and the drainage hole is provided at least one end of the first drainage section away from the second drainage section and at least one of the second drainage sections. This facilitates the rapid discharge of defrost water generated by the first, second, and third heat exchange sections.

[0016] In some exemplary embodiments, the inner wall of the drainage trough includes a first sidewall, a bottom wall, and a second sidewall connected sequentially along the width direction of the drainage trough. The top end of the first sidewall is located below the air-side heat exchanger, and the top end of at least a portion of the second sidewall is located inside the thickness direction of the air-side heat exchanger. Both the first sidewall and the second sidewall are configured as flow-guiding inclined walls so that the width of the opening of the drainage trough is greater than the width of the bottom wall.

[0017] In this way, at least a portion of the drainage trough is located inside the thickness direction of the first heat exchange section, which reduces the overlap area between the drainage trough and the heat exchanger installation area. This increases the contact area between the air-side heat exchanger and the chassis, thereby improving the heating effect of the air-side heat exchanger on the chassis during defrosting mode. Furthermore, both the first and second sidewalls are designed as flow-guiding slopes, so that the width of the drainage trough opening is greater than the width of the bottom wall. This facilitates the rapid and smooth flow of defrosting water into the drainage trough, improving drainage efficiency.

[0018] In some exemplary embodiments, the top end of the second sidewall is higher than the top end of the first sidewall. This allows the second sidewall to act as a water barrier, preventing water in the drainage trough from overflowing inwards and affecting structures such as the fan.

[0019] In some exemplary embodiments, the bottom wall extends downwards along the direction close to the drain hole. This facilitates the flow of water in the drainage channel towards the drain hole under the influence of gravity, thereby improving drainage efficiency.

[0020] In some exemplary embodiments, the heat exchanger mounting area is provided with a plurality of flexible pads, and a portion of the air-side heat exchanger is supported on the plurality of flexible pads. The flexible pads can appropriately separate the air-side heat exchanger from the chassis, which helps to avoid interference between the heat exchange fins of the air-side heat exchanger and the chassis.

[0021] In some exemplary embodiments, the thickness of the flexible pad in its natural state is in the range of 2 mm to 3 mm. Therefore, the thinness of the flexible pad allows the air-side heat exchanger to fit substantially tightly against the chassis.

[0022] In some exemplary embodiments, the heat pump unit further includes an electric heating element disposed within the drain trough and passing through the drain hole. This allows the electric heating element to heat the defrost water, further reducing the risk of the defrost water freezing and improving the smoothness of low-temperature drainage from the chassis. Furthermore, the electric heating element passing through the drain hole heats the drain hole area, reducing the risk of the drain hole freezing and also improving the smoothness of low-temperature drainage from the chassis.

[0023] In some exemplary embodiments, the bottom of the air-side heat exchanger is provided with a subcooling pipe, at least a portion of which is in contact with the chassis.

[0024] In this way, during defrosting mode, the high-temperature and high-pressure refrigerant discharged from the compressor first enters the main body of the air-side heat exchanger, and then enters the subcooling pipe for subcooling. However, the subcooling pipe can still maintain a certain temperature, which can heat the chassis to improve the smoothness of chassis drainage. Attached Figure Description

[0025] Figure 1 This is a partial top view of a heat pump unit provided in some embodiments of this application;

[0026] Figure 2 for Figure 1 The diagram shows the structure after removing the air-side heat exchanger.

[0027] Figure 3 for Figure 1 A schematic cross-sectional view of the structure shown along direction AA.

[0028] Figure 4 for Figure 1 A cross-sectional view of the structure along the BB direction;

[0029] Figure 5 for Figure 4 Enlarged structural diagram of section C;

[0030] Figure 6 This is a cross-sectional structural schematic diagram of a wind-side heat exchanger provided in some embodiments of this application.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Chassis; 11. Heat exchanger installation area; 111. First installation area; 112. Second installation area; 113. Third installation area; 114. Boss; 12. Drainage groove; 121. First drainage section; 122. Second drainage section; 1221. First inclined section; 1222. Second inclined section; 123. Third drainage section; 124. First side wall; 125. Bottom wall; 126. Second side wall; 13. Drainage hole.

[0033] 2. Air-side heat exchanger, 21. First heat exchange section, 22. Second heat exchange section, 23. Third heat exchange section, 24. Main body, 25. Subcooling tube;

[0034] 3. Flexible pads;

[0035] 4. Electric heating element. Detailed Implementation

[0036] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0037] This application provides a heat pump unit, including a chassis 1 and an air-side heat exchanger 2. The heat pump unit can be a side-discharge air unit. The heat pump unit may also include a casing, a compressor, a water-side heat exchanger, a throttling device, a reversing valve, a fan, and other structures. The casing and chassis 1 can enclose an installation cavity for mounting the compressor, water-side heat exchanger, throttling device, reversing valve, fan, and other structures. The refrigerant flow paths of the compressor and water-side heat exchanger, the throttling device, the air-side heat exchanger 2, and the reversing valve are connected through refrigerant pipelines, forming a heating circuit and a defrosting circuit, so that the heat pump unit has a heating mode and a defrosting mode. The switching between the heating circuit and the defrosting circuit can be realized through the reversing valve.

[0038] In heating mode, the compressor, the refrigerant flow path of the water-side heat exchanger, the throttling device, and the air-side heat exchanger 2 are connected in sequence to form a heating circuit. The high-temperature, high-pressure refrigerant discharged from the compressor enters the refrigerant flow path of the water-side heat exchanger, condenses and releases heat, and after being throttled and depressurized by the throttling device, it enters the air-side heat exchanger 2. After evaporating and absorbing heat from the air in the air-side heat exchanger 2, it flows back to the compressor. The water flow path of the water-side heat exchanger exchanges heat with the refrigerant flow path, and after absorbing heat, it delivers the heat to the target to be heated (the target to be heated can be, but is not limited to, heating pipes or water heaters, for indoor heating or water heating). The fan is used to blow outdoor air towards the air-side heat exchanger 2, allowing the air-side heat exchanger 2 to absorb heat from the air. Therefore, in heating mode, the air-side heat exchanger 2 is used as an evaporator. In low-temperature environments, it is prone to freezing, which affects the heat exchange efficiency. Therefore, defrosting is required to restore the heat exchange efficiency of the air-side heat exchanger 2.

[0039] In defrost mode, the refrigerant flow paths of the compressor, air-side heat exchanger 2, throttling device, and water-side heat exchanger are sequentially connected to form a defrost circuit. The high-temperature, high-pressure refrigerant discharged from the compressor enters the air-side heat exchanger 2 for condensation and heat release. After being throttled and depressurized by the throttling device, it enters the refrigerant flow path of the water-side heat exchanger. After evaporation in the water-side heat exchanger, it flows back to the compressor. Therefore, in heating mode, the air-side heat exchanger 2 is used as a condenser, utilizing the heat generated by the condenser to melt the ice layer on the air-side heat exchanger 2, thus achieving the defrosting purpose.

[0040] However, when the outdoor ambient temperature is low, the temperature of chassis 1 is also relatively low. Defrosting water droplets falling onto chassis 1 will freeze, causing poor drainage. Furthermore, the ice layer will accumulate on chassis 1, potentially causing the two heat exchangers (air-side heat exchanger 2 and water-side heat exchanger) to crack, leading to overall unit failure. Therefore, this application embodiment improves the structure of the heat pump unit.

[0041] Specifically, the chassis 1 is provided with a heat exchanger mounting area 11, and the air-side heat exchanger 2 is mounted on the chassis 1 and located in the heat exchanger mounting area 11. Furthermore, at least a portion of the bottom of the air-side heat exchanger 2 is in contact with the chassis 1 so as to heat the chassis 1 using the air-side heat exchanger 2 in defrosting mode.

[0042] The heat pump unit provided in this application embodiment allows at least a portion of the bottom of the air-side heat exchanger 2 to contact the chassis 1, enabling the heat from the air-side heat exchanger 2, which acts as a condenser in the defrosting mode, to be conducted to the chassis 1. This heats the chassis 1, raising its temperature and making it difficult for defrosting water to freeze on the chassis 1. This facilitates smooth drainage from the chassis 1 and reduces the risk of ice buildup on the chassis 1 causing the two heat exchangers to burst.

[0043] Furthermore, compared to the solution of setting an additional electric heating element 4 to heat the chassis 1, this solution makes full use of the heat of the air-side heat exchanger 2 itself to heat the chassis 1, resulting in better energy saving.

[0044] In some exemplary embodiments, the chassis 1 is provided with a drain trough 12 for collecting liquids (such as condensate, defrost water, rainwater, etc.) dripping from the air-side heat exchanger 2. The drain trough 12 is provided with at least one drain hole 13 to facilitate the timely discharge of the liquid collected in the drain trough 12. Condensate is generated when the ambient temperature is high and drips directly into the drain trough 12 for discharge without causing the chassis 1 to freeze. Rainwater is also generally generated when the ambient temperature is high and can drip directly into the drain trough 12 for discharge without causing the chassis 1 to freeze.

[0045] At least a portion of the projection of the drainage trough 12 onto the chassis 1 coincides with the projection of the heat exchanger mounting area 11 onto the chassis 1, which facilitates the direct dripping of liquid from the air-side heat exchanger 2 into the drainage trough 12 without it flowing from other parts of the chassis 1 into the drainage trough 12, thereby improving drainage efficiency.

[0046] In some exemplary embodiments, the air-side heat exchanger 2 includes a first heat exchange section 21, a second heat exchange section 22, and a third heat exchange section 23 arranged sequentially along the length of the heat exchanger mounting area 11. The third heat exchange section 23 is bent relative to the first heat exchange section 21, and the second heat exchange section 22 is smoothly connected to the first heat exchange section 21 and the third heat exchange section 23. The third heat exchange section 23 and the first heat exchange section 21 can be perpendicular to each other. Therefore, the air-side heat exchanger 2 is bent and can be called an L-shaped heat exchanger. Compared with a straight plate heat exchanger, this is advantageous for increasing the heat exchange area and thus improving the heat exchange capacity.

[0047] The heat exchanger mounting area 11 includes a first mounting area 111, a second mounting area 112, and a third mounting area 113. A first heat exchanger 21 is mounted in the first mounting area 111, a second heat exchanger 22 is mounted in the second mounting area 112, and a third heat exchanger 23 is mounted in the third mounting area 113. The second mounting area 112 has a boss 114 for supporting the air-side heat exchanger 2. A portion of the drain groove 12 is located within the second mounting area 112, and at least a portion of the bottom of the second heat exchanger 22 contacts the chassis 1.

[0048] The boss 114 is in direct contact with the air-side heat exchanger 2, and defrost water easily drips onto the boss 114 and remains there at least partially, making the area of ​​the boss 114 more prone to freezing. Therefore, a portion of the drain groove 12 is located within the second mounting area 112, and at least a portion of the bottom of the second heat exchange section 22 is in contact with the chassis 1, which facilitates effective heating of the second mounting area 112, reduces the risk of freezing on the boss 114, and promotes rapid drainage of defrost water from the second mounting area 112.

[0049] In some exemplary embodiments, the drainage channel 12 includes a first drainage section 121, a second drainage section 122, and a third drainage section 123 arranged sequentially along the length of the drainage channel 12. The first drainage section 121 is located below the first heat exchange section 21 and is configured to collect liquid dripping from the first heat exchange section 21. The second drainage section 122 is located below the second heat exchange section 22 and is configured to collect liquid dripping from the second heat exchange section 22. The third drainage section 123 is located below the third heat exchange section 23 and is configured to collect liquid dripping from the third heat exchange section 23. At least a portion of the second drainage section 122 is located within the second mounting area 112.

[0050] In this way, the defrosting water dripping from various parts of the air-side heat exchanger 2 can quickly enter the drain trough 12 and be discharged without having to flow through a long path on the chassis 1 before entering the drain trough 12. This helps to improve the drainage efficiency of the chassis 1 and also helps to reduce the risk of the chassis 1 freezing.

[0051] In some exemplary embodiments, the extension direction of the first drainage section 121 is parallel to the extension direction of the first heat exchange section 21. The extension direction of the third drainage section 123 is parallel to the extension direction of the third heat exchange section 23. At least a portion of the first drainage section 121 is located inside the thickness direction of the first heat exchange section 21, and at least a portion of the third drainage section 123 is located inside the thickness direction of the third heat exchange section 23. This reduces the overlapping area between the drainage groove 12 and the heat exchanger mounting area 11, which helps to increase the contact area between the air-side heat exchanger 2 and the chassis 1, thereby improving the heating effect of the air-side heat exchanger 2 on the chassis 1 in defrosting mode.

[0052] The second drainage section 122 includes a first inclined section 1221 and a second inclined section 1222. One end of the first inclined section 1221 is connected to the first drainage section 121, and the other end of the first inclined section 1221 extends inclinedly away from the first drainage section 121 and the third drainage section 123. One end of the second inclined section 1222 is connected to the third drainage section 123. The other end of the second inclined section 1222 extends inclinedly away from the first drainage section 121 and the third drainage section 123, and is connected to the first inclined section 1221. This ensures that at least a portion of the second drainage section 122 is located within the second installation area 112, reducing the risk of icing on the bosses 114 within the second installation area 112 and facilitating the rapid drainage of defrost water from the second installation area 112.

[0053] In some exemplary embodiments, the length of the first heat exchange section 21 is greater than the length of the third heat exchange section 23. Therefore, the defrosting water produced by the first heat exchange section 21 is more than that produced by the third heat exchange section 23.

[0054] The length of the first drainage section 121 is greater than the length of the third drainage section 123, which matches the lengths of the first heat exchange section 21 and the third heat exchange section 23, resulting in a reasonable layout.

[0055] Drainage holes 13 are provided at the end of the first drainage section 121 away from the second drainage section 122 and at least one of the second drainage sections 122. When the end of the first drainage section 121 away from the second drainage section 122 has a drainage hole 13, it facilitates the rapid discharge of the large amount of defrosting water generated by the first heat exchange section 21. When the second drainage section 122 has a drainage hole 13, it facilitates the discharge of defrosting water generated by the first heat exchange section 21, the second heat exchange section 22, and the third heat exchange section 23 from that point. When drainage holes 13 are provided at the end of the first drainage section 121 away from the second drainage section 122 and in all of the second drainage sections 122, it facilitates the rapid discharge of defrosting water generated by the first heat exchange section 21, the second heat exchange section 22, and the third heat exchange section 23.

[0056] Of course, the number of drain holes 13 can be one, three, or more. The position of the drain holes 13 is not limited to the above positions and can be flexibly adjusted as needed.

[0057] In some exemplary embodiments, the inner wall of the drainage trough 12 includes a first sidewall 124, a bottom wall 125, and a second sidewall 126 connected sequentially along the width direction of the drainage trough 12. The top end of the first sidewall 124 is located below the air-side heat exchanger 2. At least a portion of the top end of the second sidewall 126 is located inside the thickness direction of the air-side heat exchanger 2, for example, the top end of the second sidewall 126 of the first drainage section 121 and the top end of the second sidewall 126 of the third drainage section 123 are located inside the thickness direction of the air-side heat exchanger 2. In this way, at least a portion of the drainage trough 12 is located inside the thickness direction of the first heat exchange section 21, which can reduce the overlapping area between the drainage trough 12 and the heat exchanger mounting area 11, which is beneficial to increasing the contact area between the air-side heat exchanger 2 and the chassis 1, thereby improving the heating effect of the air-side heat exchanger 2 on the chassis 1 in defrosting mode.

[0058] Furthermore, both the first sidewall 124 and the second sidewall 126 are configured as flow-guiding inclined walls so that the width of the opening of the drainage trough 12 is greater than the width of the bottom wall 125. This facilitates the rapid and smooth flow of defrosting water into the drainage trough 12, thereby improving drainage efficiency.

[0059] In some exemplary embodiments, the top of the second sidewall 126 is positioned higher than the top of the first sidewall 124. This allows the second sidewall 126 to act as a water barrier, preventing water in the drainage trough 12 from overflowing inwards and affecting structures such as the fan.

[0060] In some exemplary embodiments, the bottom wall 125 extends downward at an angle close to the drain hole 13, facilitating the flow of water in the drainage trough 12 towards the drain hole 13 under the influence of gravity, thereby improving drainage efficiency. The angle of inclination of the bottom wall 125 can be reasonably set as needed, such as 1°, 2°, 3°, etc.

[0061] In some exemplary embodiments, the heat exchanger mounting area 11 is provided with a plurality of flexible pads 3 at intervals, and a portion of the air-side heat exchanger 2 is supported on the plurality of flexible pads 3. The flexible pads 3 can appropriately separate the air-side heat exchanger 2 from the chassis 1, which helps to avoid interference between the heat exchange fins of the air-side heat exchanger 2 and the chassis 1. However, the flexible pads 3 can be elastically deformed. When the air-side heat exchanger 2 is supported on the flexible pads 3, the flexible pads 3 can be compressed, so that the part of the heat exchanger mounting area 11 without the flexible pads 3 can contact the bottom of the air-side heat exchanger 2, so that the air-side heat exchanger 2 can be used to heat the chassis 1 in defrosting mode.

[0062] In one embodiment, the first mounting area 111 is provided with two flexible pads 3, and the third mounting area 113 is provided with two flexible pads 3. The flexible pads 3 can be, but are not limited to, rubber pads.

[0063] In some exemplary embodiments, the thickness of the flexible pad 3 in its natural state is in the range of 2mm to 3mm, such as 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3.0mm, etc. Therefore, the thickness of the flexible pad 3 is relatively thin, allowing the bottom of the air-side heat exchanger 2 to be substantially in close contact with the chassis 1.

[0064] Of course, the thickness of the flexible pad 3 is not limited to the above range and can be adjusted flexibly as needed.

[0065] In some exemplary embodiments, the heat pump unit further includes an electric heating element 4, disposed within the drain trough 12 and passing through a drain hole 13. The electric heating element 4 may be, but is not limited to, an electric heating belt, an electric heating tube, an electric heating wire, an electric heating film, or other structures.

[0066] This allows the electric heating element 4 to heat the defrost water, further reducing the risk of the defrost water freezing and improving the smoothness of low-temperature drainage from the chassis 1. Furthermore, the electric heating element 4, passing through the drain hole 13, can heat the drain hole 13, reducing the risk of the drain hole 13 freezing and also improving the smoothness of low-temperature drainage from the chassis 1.

[0067] In some exemplary embodiments, the bottom of the air-side heat exchanger 2 is provided with a subcooling pipe 25, at least a portion of which contacts the chassis 1. The subcooling pipe 25 may be a U-shaped pipe.

[0068] In heating mode, the refrigerant, after being throttled by the throttling device, first enters the subcooling pipe 25 of the air-side heat exchanger 2, and then enters the main body 24 of the air-side heat exchanger 2 for evaporation and heat absorption. Therefore, the temperature of the subcooling pipe 25 will be higher than that of the main body 24 of the air-side heat exchanger 2, which helps to prevent the temperature of the chassis 1 from becoming too low due to the influence of the air-side heat exchanger 2. In defrosting mode, the high-temperature and high-pressure refrigerant discharged from the compressor first enters the main body 24 of the air-side heat exchanger 2, and then enters the subcooling pipe 25 for subcooling. However, the subcooling pipe 25 can still maintain a certain temperature, which can heat the chassis 1 to improve the smoothness of drainage of the chassis 1.

[0069] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A heat pump unit, characterized in that, include: Chassis and air-side heat exchanger; The chassis is provided with a heat exchanger mounting area, the air-side heat exchanger is mounted on the chassis and located in the heat exchanger mounting area, and at least a portion of the bottom of the air-side heat exchanger is in contact with the chassis to heat the chassis using the air-side heat exchanger in defrosting mode.

2. The heat pump unit according to claim 1, characterized in that, The chassis is provided with a drain trough for collecting liquid dripping from the air-side heat exchanger. The drain trough is provided with at least one drain hole. At least a portion of the projection of the drain trough on the chassis coincides with the projection of the heat exchanger mounting area on the chassis.

3. The heat pump unit according to claim 2, characterized in that, The air-side heat exchanger includes a first heat exchange section, a second heat exchange section, and a third heat exchange section arranged sequentially along the length of the heat exchanger installation area. The third heat exchange section is bent relative to the first heat exchange section, and the second heat exchange section is smoothly connected to the first heat exchange section and the third heat exchange section. The heat exchanger mounting area includes a first mounting area, a second mounting area, and a third mounting area. The first heat exchanger is mounted in the first mounting area, the second heat exchanger is mounted in the second mounting area, and the third heat exchanger is mounted in the third mounting area. The second mounting area is provided with a boss for supporting the air-side heat exchanger. A portion of the drainage groove is located in the second mounting area, and at least a portion of the bottom of the second heat exchanger is in contact with the chassis.

4. The heat pump unit according to claim 3, characterized in that, The drainage channel includes a first drainage section, a second drainage section, and a third drainage section arranged sequentially along the length of the drainage channel; the first drainage section is located below the first heat exchanger and is configured to collect liquid dripping from the first heat exchanger; the second drainage section is located below the second heat exchanger and is configured to collect liquid dripping from the second heat exchanger; the third drainage section is located below the third heat exchanger and is configured to collect liquid dripping from the third heat exchanger; at least a portion of the second drainage section is located within the second installation area.

5. The heat pump unit according to claim 4, characterized in that, The extension direction of the first drainage section is parallel to the extension direction of the first heat exchange section, and the extension direction of the third drainage section is parallel to the extension direction of the third heat exchange section; at least a portion of the first drainage section is located inside the thickness direction of the first heat exchange section, and at least a portion of the third drainage section is located inside the thickness direction of the third heat exchange section. The second drainage section includes a first inclined section and a second inclined section. One end of the first inclined section is connected to the first drainage section, and the other end of the first inclined section extends inclinedly away from the first drainage section and the third drainage section. One end of the second inclined section is connected to the third drainage section. The other end of the second inclined section extends inclinedly away from the first drainage section and the third drainage section and is connected to the first inclined section.

6. The heat pump unit according to claim 4, characterized in that, The length of the first heat exchange section is greater than the length of the third heat exchange section, the length of the first drainage section is greater than the length of the third drainage section, and the drainage hole is provided at least one of the ends of the first drainage section away from the second drainage section and the second drainage section.

7. The heat pump unit according to any one of claims 2 to 6, characterized in that, The inner wall of the drainage trough includes a first side wall, a bottom wall, and a second side wall connected sequentially along the width direction of the drainage trough. The top of the first side wall is located on the lower side of the air-side heat exchanger, and the top of at least a portion of the second side wall is located on the inner side of the thickness direction of the air-side heat exchanger. Both the first side wall and the second side wall are configured as flow-guiding inclined walls so that the width of the opening of the drainage trough is greater than the width of the bottom wall.

8. The heat pump unit according to claim 7, characterized in that, The top of the second sidewall is positioned higher than the top of the first sidewall; and / or The bottom wall extends downwards along the direction close to the drain hole.

9. The heat pump unit according to any one of claims 1 to 6, characterized in that, The heat exchanger installation area is provided with multiple flexible pads, and a portion of the air-side heat exchanger is supported by the multiple flexible pads.

10. The heat pump unit according to claim 9, characterized in that, The thickness of the flexible pad in its natural state is in the range of 2mm to 3mm.

11. The heat pump unit according to any one of claims 2 to 6, characterized in that, Also includes: An electric heating element is disposed in the drainage groove and passes through the drainage hole.

12. The heat pump unit according to any one of claims 1 to 6, characterized in that, The bottom of the air-side heat exchanger is provided with a subcooling pipe, at least a portion of which is in contact with the chassis.

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