Heat pump unit

Abstract

The utility model discloses a heat pump unit, which belongs to the technical field of air conditioners and comprises a base plate, a supporting seat, a heat exchanger, a fan unit and a pipeline component. The supporting seat is arranged on the chassis; the heat exchanger is arranged on the supporting seat; the heat exchanger is located above the chassis, the heat exchanger and the chassis are arranged at intervals, the heat exchanger is provided with pipe connecting parts which are sequentially arranged from top to bottom, the fan set is arranged above the heat exchanger, and the pipeline assembly comprises a plurality of refrigerant conveying pipes; the multiple refrigerant conveying pipes are sequentially arranged from top to bottom, and each pipe connecting part is at least connected with one refrigerant conveying pipe. The length of the refrigerant conveying pipe on any pipe connecting part is larger than that of the refrigerant conveying pipe on the pipe connecting part below the pipe connecting part, and / or the diameter of the refrigerant conveying pipe on any pipe connecting part is larger than that of the refrigerant conveying pipe on the pipe connecting part below the pipe connecting part. According to the heat pump unit, heat exchange of the heat exchanger can be uniform and sufficient, and the heat exchange efficiency of the heat exchanger is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a heat pump unit. Background Art

[0002] In traditional air source heat pump units, the refrigerant flow in the refrigerant delivery pipe near the bottom of the heat exchanger is greater than the refrigerant flow in the refrigerant delivery pipe near the top of the heat exchanger. The temperature of the refrigerant delivery pipe near the bottom of the heat exchanger is lower, which will lead to insufficient heat exchange of the heat exchanger. For heat pump units with top air outlet, this can easily cause frost on the bottom of the heat exchanger and the refrigerant delivery pipe connected to the bottom of the heat exchanger. Because in heat pump units with top air outlet, the power source fan unit of the heat pump unit is above the heat exchanger. At this time, the negative pressure inside the heat exchanger gradually decreases from top to bottom. The large negative pressure means that more air passes through the heat exchanger for heat exchange, and the heat exchange is good. The top of the heat exchanger can absorb enough heat from the air. The top of the heat exchanger has better heat exchange and is not easy to frost. The bottom of the heat exchanger can absorb less heat from the air, and the heat exchange at the bottom of the heat exchanger is poor. The heat exchange of the heat exchanger is insufficient and uneven, which makes it easy for frost to form on the bottom of the heat exchanger. Therefore, the existing heat pump unit easily absorbs water vapor in the air and condenses it into frost, which eventually causes frost on the bottom of the heat exchanger and the refrigerant delivery pipe connected to the bottom of the heat exchanger, affecting the heat exchange efficiency of the heat exchanger. Utility Model Content

[0003] The purpose of the embodiment of the present utility model is to provide a heat pump unit that can make the heat exchange of the heat exchanger uniform and sufficient, thereby improving the heat exchange efficiency of the heat exchanger.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A heat pump unit, comprising:

[0006] chassis;

[0007] A support base, provided on the chassis;

[0008] A heat exchanger is provided on the support base; the heat exchanger is located above the chassis and spaced apart from the chassis, and the heat exchanger has connecting pipes arranged sequentially from top to bottom;

[0009] A fan unit is arranged above the heat exchanger;

[0010] as well as

[0011] The pipeline assembly includes a plurality of refrigerant delivery pipes; the plurality of refrigerant delivery pipes are arranged sequentially from top to bottom, and each of the connecting pipes is connected to at least one refrigerant delivery pipe;

[0012] The length of the refrigerant delivery pipe on any of the connecting pipes is greater than the length of the refrigerant delivery pipe on the connecting pipe below it;

[0013] and / or

[0014] The diameter of the refrigerant delivery pipe on any one of the connecting pipe portions is larger than the diameter of the refrigerant delivery pipe on the connecting pipe portion located therebelow.

[0015] Optionally, the pipeline assembly further includes a distributor; one end of each of the refrigerant delivery pipes is connected to the distributor, and the other end of each of the refrigerant delivery pipes is connected to the heat exchanger.

[0016] Optionally, the heat pump unit further includes a first connecting frame; the first connecting frame is installed on the heat exchanger and is provided with a lifting hole.

[0017] Optionally, the first connecting frame includes a first connecting plate, a second connecting plate, and a third connecting plate; the first connecting plate, the second connecting plate, and the third connecting plate are all provided with the lifting holes, the heat exchanger extends along a portion of the edge of the chassis, and the first connecting plate, the second connecting plate, and the third connecting plate are sequentially installed on the heat exchanger along the extension path of the heat exchanger, the first connecting plate is located at one end of the heat exchanger and is connected to the support base, and the third connecting plate is located at the other end of the heat exchanger and is connected to the support base.

[0018] Optionally, the heat pump unit further includes a vertical beam installed on the chassis and a horizontal beam installed on the vertical beam; the fan unit is installed on the horizontal beam, and the first connecting plate and / or the second connecting plate and / or the third connecting plate are connected to the horizontal beam.

[0019] Optionally, the heat pump unit further includes a second connecting frame; the second connecting frame is mounted on the chassis and connected to the support seat, and the first connecting plate or the third connecting plate is connected to the second connecting frame.

[0020] Optionally, the heat pump unit further includes a positioning frame; the positioning frame is mounted on the support seat and is provided with a positioning groove, and the lower end of the heat exchanger is arranged in the positioning groove.

[0021] Optionally, the support seat includes a support frame and a water collecting pan installed on the support frame; the support frame is installed on the chassis and together with the chassis form a water collecting trough, the heat exchanger is installed on the support frame and is located above the water collecting pan, the water collecting pan is located above the water collecting trough and is provided with a water collecting trough and a drain hole, the water collecting trough is connected with the water collecting trough through the drain hole, a drainage hole is opened on the support frame, the drainage hole faces the outside of the chassis, and the water collecting trough is connected with the outside of the chassis through the drainage hole.

[0022] Optionally, a heating device is provided on the chassis.

[0023] Optionally, each of the refrigerant delivery pipes is a capillary tube, and each of the refrigerant delivery pipes is sleeved with a heat shrink tube.

[0024] The beneficial effects of the present invention are as follows: the heat exchanger of the heat pump unit has pipe sections arranged sequentially from top to bottom. By connecting refrigerant delivery pipes of different lengths and / or diameters to different pipe sections, the resistance of the refrigerant delivery pipe near the bottom of the heat exchanger is increased, thereby reducing the refrigerant flow in the refrigerant delivery pipe near the bottom of the heat exchanger, thereby avoiding frost on the bottom of the heat exchanger and the refrigerant delivery pipe connected to the bottom of the heat exchanger when the fan unit is arranged above the heat exchanger. At the same time, by providing a support base, the heat pump unit brings the heat exchanger closer to the fan unit, which not only improves the heat exchange efficiency of the bottom of the heat exchanger, but also ensures that the heat exchanger is at a certain height from the chassis, thereby preventing the chassis from freezing and affecting the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural diagram of the heat pump unit;

[0027] Figure 2 This is a connection diagram of the heat exchanger, refrigerant delivery pipe, and distributor;

[0028] Figure 3 It is a structural diagram of the chassis, support base, heat exchanger, first connecting frame, second connecting frame, vertical beam, horizontal beam, and positioning frame;

[0029] Figure 4 It is a structural diagram of the chassis, support base, heat exchanger, first connecting frame, second connecting frame, vertical beam, and positioning frame;

[0030] Figure 5 It is a partial cross-sectional view of the structure of the chassis, support base and heat exchanger;

[0031] Figure 6 for Figure 5 Magnified view of point A.

[0032] Description of the accompanying drawings:

[0033] 11. Chassis; 12. Support base; 13. Heat exchanger; 14. Fan unit; 15. Pipeline assembly; 16. First connecting frame; 17. Vertical beam; 18. Horizontal beam; 19. Second connecting frame; 20. Positioning frame; 21. Water collecting tank;

[0034] 121. Support frame; 122. Drain tray; 123. Drain trough; 124. Drain hole; 125. Water pipe; 126. Drain hole;

[0035] 151. Refrigerant delivery pipe; 152. Distributor; 153. Transition pipe;

[0036] 161. First connecting plate; 162. Second connecting plate; 163. Third connecting plate; 164. Lifting hole;

[0037] 201. Positioning clip groove. DETAILED DESCRIPTION

[0038] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0039] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "fixed," "connected," "communicated," "abutted," "clamped," etc. should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description herein, it should be understood that terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] Throughout this specification, references to terms such as "one embodiment" and "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0044] Unless specifically stated or defined otherwise, the term “and / or” used in the present invention includes any and all combinations of one or more of the associated listed items.

[0045] The fan unit of the existing heat pump unit is generally set at the top, and multiple refrigerant delivery pipes are arranged at intervals from top to bottom and are all connected to the heat exchanger through a distributor. The refrigerant will enter the heat exchanger through the refrigerant delivery pipe and the distributor to exchange heat with the air. Due to factors such as the distributor and the gravity of the refrigerant itself, the refrigerant is mainly concentrated in the refrigerant delivery pipe near the bottom of the heat exchanger, which will cause the refrigerant to be unevenly distributed in each refrigerant delivery pipe, that is, the refrigerant flow in the refrigerant delivery pipe near the bottom of the heat exchanger is greater than the refrigerant flow in the refrigerant delivery pipe near the top of the heat exchanger, resulting in energy waste, that is, there is no frost on the top of the heat exchanger but defrosting is performed, and the bottom of the heat exchanger is not defrosted cleanly. For heat pumps with top airflow, this can easily lead to frost on the bottom of the heat exchanger and the refrigerant delivery pipe connected to the bottom of the heat exchanger. This is because in heat pumps with top airflow, the power source fan unit of the heat pump unit is above the heat exchanger. At this time, the negative pressure inside the heat exchanger gradually decreases from top to bottom. A large negative pressure means more air is passing through the heat exchanger for heat exchange, which is good for heat exchange. The top of the heat exchanger can absorb enough heat from the air, which is not easy to frost. The bottom of the heat exchanger can absorb less heat from the air, which is poorer and less prone to heat exchange. The heat exchange is insufficient and uneven, which leads to frost on the bottom of the heat exchanger. Especially when operating in ultra-low temperature conditions, heat pumps are more likely to encounter the problem of frost on the bottom of the heat exchanger, which not only affects the heat exchange efficiency of the heat exchanger. At the same time, due to the small amount of refrigerant in the refrigerant delivery pipe near the top of the heat exchanger, it may cause high refrigerant superheat, which will cause the refrigerant gas to overheat when it returns to the compressor for circulation, reducing the service life of the heat pump components.

[0046] For the convenience of description, the up and down directions described below are Figure 1 The up and down directions are consistent.

[0047] like Figures 1 to 6 As shown, this embodiment provides a heat pump unit, comprising a chassis 11, a support base 12, a heat exchanger 13, a fan unit 14, and a piping assembly 15. The fan unit 14 comprises a plurality of fan bodies and is positioned above the heat exchanger 13. The heat exchanger 13 is a finned heat exchanger, and the refrigerant enters the heat exchanger 13 through the piping assembly 15 to exchange heat with the air.

[0048] A support base 12 is provided on the upper surface of the chassis 11. It supports the heat exchanger 13, which is mounted on the support base 12. The heat exchanger 13 is located above the chassis 11 and spaced apart from the chassis 11. The support base 12 elevates the heat exchanger 13 by at least 100 mm, bringing the bottom of the heat exchanger 13 closer to the fan unit 14. This not only reduces frost formation on the bottom of the heat exchanger 13, but also prevents water generated by defrosting the heat exchanger 13 from falling onto the chassis 11 and freezing and adhering to the bottom of the heat exchanger 13. The heat exchanger 13 has pipe connections arranged sequentially from top to bottom. The piping assembly 15 includes multiple refrigerant pipes 151. Different pipe connections can connect refrigerant pipes 151 of varying lengths and / or diameters. Longer refrigerant pipes 151 have greater resistance, while larger diameters reduce resistance. Multiple refrigerant delivery pipes 151 are arranged sequentially from top to bottom, with each connecting pipe connected to at least one refrigerant delivery pipe 151. Specifically, each connecting pipe is connected to at least multiple refrigerant delivery pipes 151, which improves heat exchange efficiency. The lengths and diameters of the connecting pipes connected to the same connecting pipe can be the same or different. However, along the vertical direction, the lengths of the refrigerant delivery pipes 151 on each connecting pipe gradually increase, and the diameters of the refrigerant delivery pipes 151 on each connecting pipe gradually decrease, so that the refrigerant delivery pipes 151 on the connecting pipes closer to the top of the heat exchanger 13 have less resistance.

[0049] There are three ways to arrange the refrigerant delivery pipe 151. The first is to have the refrigerant delivery pipe 151 on any connecting pipe section be longer than the refrigerant delivery pipe 151 on the connecting pipe section below it. The second is to have the refrigerant delivery pipe 151 on any connecting pipe section have a diameter greater than the refrigerant delivery pipe 151 on the connecting pipe section below it. The third is to use both the first and second methods. This embodiment will primarily use the first method as an example.

[0050] Thus, the present application installs refrigerant delivery pipes 151 of different lengths at different connecting pipes of the heat exchanger 13 to control the refrigerant flow rate reaching different heights of the heat exchanger 13. The shorter refrigerant delivery pipes 151 are installed at connecting pipes closer to the top of the heat exchanger 13, which increases the resistance of the refrigerant delivery pipes 151 near the bottom of the heat exchanger 13, resulting in a smaller refrigerant flow rate near the bottom of the heat exchanger 13, more sufficient heat exchange of the refrigerant near the bottom of the heat exchanger 13, and more sufficient and uniform heat exchange at each connecting pipe from top to bottom of the heat exchanger 13, thus avoiding frost on the bottom of the heat exchanger 13 and the refrigerant delivery pipes 151 connected to the bottom of the heat exchanger 13, thereby improving the heat exchange efficiency of the heat exchanger 13. At the same time, because the existing heat exchanger 13 is directly mounted on the chassis 11, the bottom of the heat exchanger 13 cannot effectively absorb heat from the air, causing ice to accumulate on the bottom of the heat exchanger 13, eventually covering the heat exchange surface of the heat exchanger 13, rendering the heat exchange unit unable to heat, and seriously affecting the heat exchange efficiency. The present application elevates the heat exchanger 13 by using the support base 12, which not only prevents the water on the chassis 11 from freezing and covering the heat exchange surface of the heat exchanger 13, but also allows the heat exchanger 13 to be closer to the fan unit 14, thereby enhancing the heat exchange dynamics between the air and the heat exchanger 13 and further improving the heat exchange efficiency of the heat exchanger 13.

[0051] Optionally, the piping assembly 15 further includes a distributor 152. One end of each refrigerant delivery pipe 151 is connected to the distributor 152, and the other end of each refrigerant delivery pipe 151 is connected to the heat exchanger 13 via a transition pipe 153. Multiple transition pipes 153 are provided, each mounted on the connecting pipe portion of the heat exchanger 13. The distributor 152 cooperates with refrigerant delivery pipes 151 of varying lengths to control the mass flow of refrigerant into the heat exchanger 13.

[0052] Furthermore, the length of each connecting pipe portion located at the upper connecting pipe portion is greater than the length of each connecting pipe portion located at the lower connecting pipe portion, the length of each connecting pipe portion of the same connecting pipe portion is the same, the diameters of the refrigerant delivery pipes 151 of different connecting pipe portions are the same, and the difference in negative pressure in the same connecting pipe portion is small. Therefore, refrigerant delivery pipes 151 of the same length are used, and at the same time, the diameters of all refrigerant delivery pipes 151 are ensured to be the same, thereby reducing the size types of the refrigerant delivery pipes 151 and facilitating the production of heat pump units.

[0053] For example, in this embodiment, the heat exchanger 13 has four connecting pipes, each connected to three refrigerant pipes 151 of equal length. The refrigerant pipes 151 on the topmost connecting pipe are the shortest, while the refrigerant pipes 151 on the bottommost connecting pipe are the longest. This increases the flow resistance of the refrigerant pipes 151 at the bottom of the heat exchanger 13, minimizing the amount of refrigerant flowing through these pipes. The three refrigerant pipes 151 on the topmost connecting pipe are 700 mm long, the three refrigerant pipes 151 on the second connecting pipe from the top are 750 mm long, the three refrigerant pipes 151 on the third connecting pipe from the top are 800 mm long, and the refrigerant pipe 151 on the bottommost connecting pipe is 850 mm long. When in heating mode, the finned heat exchanger 13 functions as an evaporator. The longer the refrigerant delivery pipe 151 on the connecting pipe portion closer to the bottom of the heat exchanger 13, the greater the resistance. Similarly, the smaller the diameter of the refrigerant delivery pipe 151, the greater the resistance. This reduces the flow of refrigerant into the refrigerant delivery pipe 151 at the bottom of the heat exchanger 13. While this affects the heat exchange efficiency at the bottom of the heat exchanger 13, it is less impactful than frost covering the heat exchange surface of the heat exchanger 13. It still allows for evaporation of the refrigerant at the bottom, reducing the risk of liquid refrigerant entering the compressor and causing damage such as liquid hammer.

[0054] In one embodiment, the heat pump unit further includes a first connecting bracket 16. The first connecting bracket 16 is mounted on the heat exchanger 13 and has a lifting hole 164. The first connecting bracket 16 facilitates lifting the heat exchanger 13 onto the support base 12 and further stabilizes the connection between the heat exchanger 13, the support base 12, and the chassis 11.

[0055] Furthermore, the first connecting frame 16 includes a first connecting plate 161, a second connecting plate 162, and a third connecting plate 163. The first connecting plate 161 and the third connecting plate 163 are both end plates, and the second connecting plate 162 is an intermediate plate. The first connecting plate 161, the second connecting plate 162, and the third connecting plate 163 are all provided with lifting holes 164. The heat exchanger 13 extends along a portion of the edge of the chassis 11. The first connecting plate 161, the second connecting plate 162, and the third connecting plate 163 are sequentially installed on the heat exchanger 13 along the extension path of the heat exchanger 13. There are multiple second connecting plates 162 installed at intervals on the heat exchanger 13. The second connecting plates 162 are connected to the heat exchange tubes of the heat exchanger 13. The first connecting plate 161 is located at one end of the heat exchanger 13 and connected to the support base 12. The third connecting plate 163 is located at the other end of the heat exchanger 13 and connected to the support base 12, thereby improving the stability of the heat exchanger 13 during lifting.

[0056] Optionally, the heat pump unit further includes a vertical beam 17 mounted on the chassis 11 and a horizontal beam 18 mounted on the vertical beam 17. The fan unit 14 is mounted on the horizontal beam 18, and the first connecting plate 161 and / or the second connecting plate 162 and / or the third connecting plate 163 are connected to the horizontal beam 18. After the heat exchanger 13 is hoisted and placed on the support seat 12, it is pre-fixed in time by the first connecting frame 16 to prevent the fins from falling off due to accidental collision, and to prevent the heat exchanger 13 from falling off during transportation and handling of the heat pump assembly. Specifically, the first connecting plate 161 and the second connecting plate 162 are both fixed to the support seat 12 by a first folding edge, and the lower ends of the first connecting plate 161 and the third connecting plate 163 are both provided with a first folding edge, and the second folding edges on the first connecting plate 161 and the second connecting plate 162 are mounted on the support seat 12 by bolts. A second folded edge is provided at the upper end of the second connecting plate 162, and the second folded edge of the second connecting plate 162 is connected to the crossbeam 18 by bolts. A third folded edge is provided at the lower end of the first connecting plate 161 and the third connecting plate 163, and the third folded edges of the first connecting plate 161 and the third connecting plate 163 are connected to the crossbeam 18 by bolts.

[0057] In one embodiment, the heat pump unit further includes a second connecting frame 19. The second connecting frame 19 is mounted on the chassis 11 and connected to the support base 12. The first connecting plate 161 or the third connecting plate 163 is connected to the second connecting frame 19. Specifically, in this embodiment, the second connecting frame 19 is mounted on one side of the first connecting plate 161. The first connecting plate 161, the support base 12, and the chassis 11 are all connected to the second connecting frame 19. This ensures that the first connecting plate 161, the support base 12, and the chassis 11 are relatively fixed, thereby improving the stability of the structure.

[0058] Furthermore, the heat pump unit also includes a positioning frame 20. There are multiple positioning frames 20 and they are arranged at intervals along the extension path of the heat exchanger 13. The positioning frame 20 is mounted on the support base 12 and is provided with a positioning clamping groove 201. The lower end of the heat exchanger 13 is disposed in the positioning clamping groove 201. The positioning frame 20 includes a fixed plate and two clamping plates spaced apart from the fixed plate. The positioning clamping groove 201 is formed between the two clamping plates. The bottom of the heat exchanger 13 is positioned by the two clamping plates. The fixed plate is provided with a fourth folded edge, which is mounted to the support base 12 by bolts, facilitating the installation of the heat exchanger 13 on the support base 12.

[0059] In one embodiment, the support base 12 includes a support frame 121 and a water collection pan 122 mounted on the support frame 121. The support frame 121 is mounted on the chassis 11 and together with the chassis 11, forms a water collection trough 21. A portion of the chassis 11 forms the bottom wall of the water collection trough 21, while the support frame 121 forms the side walls of the water collection trough 21. A reinforcement is provided below the water collection pan 122 to connect the two side walls of the water collection trough 21. The water collection trough 21 prevents water generated during defrosting of the heat exchanger 13 from flowing around the chassis 11, thereby collecting the water for convenient and uniform drainage while reducing the area of ​​ice on the chassis 11. The heat exchanger 13 is mounted on the support frame 121 and positioned above the water collection pan 122. The water collection pan 122 is positioned above the water collection trough 21 and is provided with a water collection trough 123 and a water droplet 124. The water collection trough 123 communicates with the water collection trough 21 through the water droplet 124, and the water droplet 124 is connected to a water conduit 125. The support frame 121 is provided with drainage holes 126, which face the outside of the chassis 11 and the outer edge of the chassis 11. The water collection tank 21 communicates with the outside of the chassis 11 through the drainage holes 126. The water pipe 125 and the water collection tray 122 reduce the impact of defrosting water on the chassis 11. The water collection tray 122 is located at a certain height above the heat exchanger 13, so any water that drips onto the water collection tray 122 and condenses into ice will not press against or cover the heat exchanger 13.

[0060] Optionally, a heating device is provided on the chassis 11. The chassis 11 is provided with a heating device such as a heating wire, which solves the problem of the chassis 11 freezing in winter and improves the reliability and energy efficiency of the heat pump unit.

[0061] In one embodiment, each refrigerant delivery pipe 151 is a capillary tube, and each refrigerant delivery pipe 151 is provided with a heat shrink tube. A capillary tube refers to a tube with a smaller inner diameter, which plays a role in throttling and reducing the pressure of the refrigerant, so that the saturated evaporation temperature of the refrigerant is lower than that of other tubes. During transportation and operation, the capillaries will be close to each other, and there will be relative friction between the capillaries close to each other. By providing a heat shrink tube, the mutual wear between the capillaries can be reduced. The present application reasonably adjusts the amount of refrigerant entering each flow path in the fin heat exchanger 13 by setting capillaries of different lengths, so that the overall capacity of the top-out heat pump unit is more efficient, and the heat pump unit is more reliable in terms of transportation and vibration.

[0062] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present invention without inventive effort, and such implementations will fall within the scope of protection of the present invention.

Claims

1. A heat pump unit, characterized in that: include: chassis (11); A support base (12) is provided on the chassis (11); A heat exchanger (13) is provided on the support base (12); the heat exchanger (13) is located above the chassis (11) and is spaced apart from the chassis (11); the heat exchanger (13) has connecting pipes arranged sequentially from top to bottom; A fan unit (14) is arranged above the heat exchanger (13); as well as The pipeline assembly (15) includes a plurality of refrigerant delivery pipes (151); the plurality of refrigerant delivery pipes (151) are arranged sequentially from top to bottom, and each of the connecting pipes is connected to at least one refrigerant delivery pipe (151); The length of the refrigerant delivery pipe (151) on any of the connecting pipes is greater than the length of the refrigerant delivery pipe (151) on the connecting pipe below it; and / or The diameter of the refrigerant delivery pipe (151) on any of the connecting pipes is larger than the diameter of the refrigerant delivery pipe (151) on the connecting pipe below it.

2. The heat pump unit according to claim 1, characterized in that: The pipeline assembly (15) further includes a distributor (152); one end of each of the refrigerant delivery pipes (151) is connected to the distributor (152), and the other end of each of the refrigerant delivery pipes (151) is connected to the heat exchanger (13).

3. The heat pump unit according to claim 1, characterized in that: It also includes a first connecting frame (16); the first connecting frame (16) is installed on the heat exchanger (13) and is provided with a hanging hole (164).

4. The heat pump unit according to claim 3, characterized in that: The first connecting frame (16) includes a first connecting plate (161), a second connecting plate (162), and a third connecting plate (163); the first connecting plate (161), the second connecting plate (162), and the third connecting plate (163) are all provided with the lifting hole (164); the heat exchanger (13) extends along a portion of the edge of the chassis (11); the first connecting plate (161), the second connecting plate (162), and the third connecting plate (163) are sequentially installed on the heat exchanger (13) along the extension path of the heat exchanger (13); the first connecting plate (161) is located at one end of the heat exchanger (13) and is connected to the support base (12); the third connecting plate (163) is located at the other end of the heat exchanger (13) and is connected to the support base (12).

5. The heat pump unit according to claim 4, characterized in that: The invention also includes a vertical beam (17) installed on the chassis (11) and a horizontal beam (18) installed on the vertical beam (17); the fan unit (14) is installed on the horizontal beam (18), and the first connecting plate (161) and / or the second connecting plate (162) and / or the third connecting plate (163) are connected to the horizontal beam (18).

6. The heat pump unit according to claim 4, characterized in that: It also includes a second connecting frame (19); the second connecting frame (19) is installed on the chassis (11) and connected to the support seat (12), and the first connecting plate (161) or the third connecting plate (163) is connected to the second connecting frame (19).

7. The heat pump unit according to any one of claims 1 to 6, characterized in that: It also includes a positioning frame (20); the positioning frame (20) is installed on the support seat (12) and is provided with a positioning clamping groove (201), and the lower end of the heat exchanger (13) is arranged in the positioning clamping groove (201).

8. The heat pump unit according to any one of claims 1 to 6, characterized in that: The support base (12) comprises a support frame (121) and a water receiving pan (122) mounted on the support frame (121); the support frame (121) is mounted on the chassis (11) and encloses the chassis (11) together to form a water collecting trough (21); the heat exchanger (13) is mounted on the support frame (121) and is located above the water receiving pan (122); the water receiving pan (122) is located above the water collecting trough (21) and is provided with a water receiving trough (123) and a water drop hole (124); the water receiving trough (123) is communicated with the water collecting trough (21) through the water drop hole (124); a drainage hole (126) is opened on the support frame (121); the drainage hole (126) faces the outside of the chassis (11); the water collecting trough (21) is communicated with the outside of the chassis (11) through the drainage hole (126).

9. The heat pump unit according to any one of claims 1 to 6, characterized in that: A heating device is provided on the chassis (11).

10. The heat pump unit according to any one of claims 1 to 6, characterized in that: Each of the refrigerant delivery pipes (151) is a capillary tube, and each of the refrigerant delivery pipes (151) is sleeved with a heat shrink tube.

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