V-shaped heat exchanger

Abstract

The utility model discloses a V-shaped heat exchanger which can solve the problem that the bottom of a low-temperature heat pump air conditioner is frozen in the defrosting process and optimize the energy utilization efficiency of a unit under partial load. The system comprises a first heat exchanger; and a second heat exchanger; the first heat exchanger and the second heat exchanger are the same in shape, and the top of the first heat exchanger and the top of the second heat exchanger form an inverted-V-shaped heat exchanger with an included angle alpha.

Description

Technical Field

[0001] This utility model relates to the technical field of commercial heat pump air conditioners, specifically a V-type heat exchanger. Background Technology

[0002] Existing heat pump air conditioners use H-type or L-type heat exchangers. Due to structural limitations, the bottom of these heat exchangers has low utilization in heating mode. When the finned heat exchanger is under partial load (i.e., the output power is less than the rated power), the generated high-temperature gas expands due to its high temperature, causing most of the high-temperature gas to concentrate in the upper and middle parts of the heat exchanger. Therefore, the bottom of the heat exchanger has low utilization. If the amount of low-temperature refrigerant flowing through all parts of the H-type or L-type heat exchanger is made consistent, some low-temperature refrigerant will be wasted at the bottom fins. In defrost mode, less high-temperature refrigerant flows through the bottom of the fins, and the heat exchange medium flows towards the bottom of the heat exchange tubes. In ultra-low temperature environments, the heat exchange medium may freeze at the bottom of the heat exchange tubes before it even flows out. This freezing is extremely difficult to remove and will affect the overall lifespan of the unit. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a V-type heat exchanger that can solve the problem of bottom icing during the defrosting process of low-temperature heat pump air conditioners and optimize the energy utilization efficiency of the unit under partial load.

[0004] A V-type heat exchanger, characterized in that it comprises:

[0005] First heat exchanger;

[0006] And a second heat exchanger;

[0007] The first heat exchanger and the second heat exchanger have the same shape, and the tops of the first heat exchanger and the second heat exchanger form an inverted V-shaped heat exchanger with an included angle α.

[0008] Its further features are:

[0009] Both the first and second heat exchangers include a rectangular fin assembly with a thickness, several sets of serpentine heat exchange tubes, a diverter tube, and two end caps on both sides. The rectangular fin assembly is covered with side end caps at both ends along its length, forming a heat exchange cavity. Each set of serpentine heat exchange tubes includes several straight sections and several U-shaped connecting sections, with one end of one straight section being the inlet end and the other end being the outlet end. The diverter tube is provided with a connecting pipe corresponding to each inlet end, and the diverter tube is connected to the inlet end of each set of serpentine heat exchange tubes through the corresponding connecting pipes. The straight sections of each set of serpentine heat exchange tubes are built into the heat exchange cavity, and the two end caps are provided with through holes corresponding to the inlet and outlet positions of the straight sections.

[0010] Its further characteristic is:

[0011] The end cap includes a base plate and four surrounding plates, wherein the area of ​​the base plate is larger than the side area of ​​the rectangular fin assembly.

[0012] The surrounding plate includes a pair of long plates and a pair of short plates. The pair of long plates have positioning holes at both ends and the middle of their length direction, which allows the long plates of the two heat exchangers to be reliably connected through the V-shaped sheet metal parts, thereby forming an inverted V-shaped heat exchanger with an angle of α at the top of the first heat exchanger and the second heat exchanger.

[0013] The inlet and outlet ends of each group of serpentine heat exchange tubes are located at corresponding positions on the cover plate on the same side. The inlet ends of all serpentine heat exchange tubes in the same heat exchanger correspond to one row of through holes, and the outlet ends of all serpentine heat exchange tubes in the same heat exchanger correspond to another row of through holes. The outlet ends are connected to the environmental side cavity.

[0014] A flow divider is installed inside the flow divider tube, which divides the flow into the flow divider tube into branches equal to the number of serpentine heat exchange tubes, ensuring that the flow of medium into each group of serpentine heat exchange tubes is the same.

[0015] Both ends of the rectangular fin assembly are fin layers, and the exposed end surface is the windward fin layer. The windward fin layer is coated with a hydrophilic coating, which allows condensate to slide off quickly and cleans dust and oil, further improving the fin's ability to prevent dust accumulation.

[0016] With different values ​​of the included angle α, the wind speed distribution of the windward fin layer varies along the height direction of the heat exchanger. As the included angle increases, the peak velocity shifts downward along the height direction of the heat exchanger.

[0017] When the included angle α = 30°, the wind speed on the windward side of the fin layer gradually increases along the height of the heat exchanger. The maximum speed is located at the top of the heat exchanger, and the minimum speed is located at the bottom of the heat exchanger. The difference between the maximum and minimum speeds is 4 times.

[0018] When the included angle α = 60°, the wind speed of the fin layer on the windward side gradually increases along the height of the heat exchanger. The maximum speed is located at the top of the heat exchanger, and the minimum speed is located at the bottom of the heat exchanger. The difference between the maximum and minimum speeds is twice.

[0019] When the included angle α = 90°, the wind speed distribution of the windward fin layer is basically symmetrical along the height direction of the heat exchanger, that is, the maximum wind speed occurs in the middle of the heat exchanger, which is the optimal state.

[0020] With this invention, the first heat exchanger and the second heat exchanger have the same shape, and the top of the first heat exchanger and the second heat exchanger form an inverted V-shaped heat exchanger with an included angle α. This can solve the problem of bottom icing in low-temperature heat pump air conditioners during the defrosting process and optimize the energy utilization efficiency of the unit under partial load. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention (the distributor is not located inside the distributor tube in the figure);

[0022] Figure 2 This is a schematic diagram of the structure of the present invention from the right side view.

[0023] Figure 3 This is a schematic diagram of the structure of the present invention from the left side view.

[0024] Figure 4 This is a top view structural diagram of the present invention;

[0025] Figure 5 for Figure 1 A magnified view of part A;

[0026] The names corresponding to the serial numbers in the diagram are as follows:

[0027] Angle α;

[0028] First heat exchanger 100, second heat exchanger 200;

[0029] 10 Rectangular fin assembly, 11 Windward fin layer, 20 serpentine heat exchange tube, 21 Straight section, 22 U-shaped connecting section, 23 Inlet end, 24 Outlet end, 30 Diverter tube, 40 Diverter, 50 End cap, 51 Through hole, 52 Base plate, 53 Long surrounding plate, 54 Short surrounding plate, 55 Positioning hole, 60 Connecting pipe, 70 Bottom cover plate. Detailed Implementation

[0030] A type of V-type heat exchanger, see Figures 1-5 It includes a first heat exchanger 100 and a second heat exchanger 200.

[0031] The first heat exchanger 100 and the second heat exchanger 200 have the same shape, and the tops of the first heat exchanger 100 and the second heat exchanger 200 form an inverted V-shaped heat exchanger with an included angle α.

[0032] In specific implementation, both the first heat exchanger 100 and the second heat exchanger 200 include a rectangular fin assembly 10 with thickness, several sets of serpentine heat exchange tubes 20, a diversion pipe 30, two side end caps 50, and a bottom cover plate 70. The two ends of the rectangular fin assembly 10 along its length are respectively covered with side end caps 50 to form a heat exchange cavity. The bottom of the rectangular fin assembly 10 is provided with a bottom cover plate 70 for protection. Each set of serpentine heat exchange tubes 20 includes several straight sections 21 and several U-shaped connecting sections 22. One end of one straight section is the inlet end 23, and the other end of the straight section is the outlet end 24. The diversion pipe 30 is provided with a connecting pipe 60 corresponding to each inlet end 23. The diversion pipe 30 is connected to the inlet end 23 of each set of serpentine heat exchange tubes 20 through the corresponding connecting pipe 60. The straight sections of each set of serpentine heat exchange tubes 20 are built into the heat exchange cavity. The two side end caps 50 are provided with through holes 51 corresponding to the inlet and outlet positions of the straight sections 21.

[0033] The end cap 50 includes a base plate 52 and four surrounding plates. The area of ​​the base plate 52 is larger than the side area of ​​the rectangular fin assembly 10.

[0034] The surrounding plates include a pair of long plates 53 and a pair of short plates 54. The pair of long plates 53 have positioning holes 55 at both ends and the middle along their length, which allow the long plates 54 of the two heat exchangers to be reliably connected by a V-shaped sheet metal part (not shown in the figure, but can be actually made according to the included angle α). This results in the tops of the first heat exchanger 100 and the second heat exchanger 200 forming an inverted V-shaped heat exchanger with an angle of α.

[0035] In specific implementation, the inlet end 23 and outlet end 24 of each group of serpentine heat exchange tubes 20 are located at the corresponding positions of the cover plate 50 on the same side. The inlet end 23 of all serpentine heat exchange tubes 20 in the same heat exchanger corresponds to one row of through holes 51, and the outlet end 24 of all serpentine heat exchange tubes 20 in the same heat exchanger corresponds to another row of through holes 52. The outlet end 24 is directly connected to the environmental side cavity.

[0036] A flow divider 40 is provided inside the flow divider 30. The flow divider 40 divides the flow into the flow divider 30 into branches of the number of serpentine heat exchange tubes 20, ensuring that the flow of the medium flowing into each group of serpentine heat exchange tubes 20 is the same. In a specific embodiment, the number of serpentine heat exchange tubes is 13, that is, the flow divider divides the flow into 13 groups of branches.

[0037] In a specific embodiment, both ends of the rectangular fin assembly 10 are fin layers, and its exposed end surface is the windward fin layer 11. The windward fin layer 11 is coated with a hydrophilic coating. The hydrophilic coating can make condensate slide off quickly, which can clean dust and oil stains and further improve the fin's ability to prevent dust accumulation.

[0038] In practice, the wind speed distribution of the windward fin layer 11 on the windward side varies along the height direction of the heat exchanger depending on the value of the included angle α. As the included angle increases, the peak velocity shifts downward along the height direction of the heat exchanger.

[0039] When the included angle α = 30°, the wind speed of the fin layer 11 on the windward side gradually increases along the height direction of the heat exchanger. The maximum speed is located at the upper part of the heat exchanger, and the minimum speed is located at the lower part of the heat exchanger. The difference between the maximum and minimum speeds is 4 times.

[0040] When the included angle α = 60°, the wind speed of the fin layer 11 on the windward side gradually increases along the height direction of the heat exchanger. The maximum speed is located at the upper part of the heat exchanger, and the minimum speed is located at the lower part of the heat exchanger. The difference between the maximum and minimum speeds is 2 times.

[0041] When the included angle α = 90°, the wind speed distribution of the windward fin layer 11 is basically symmetrical along the height direction of the heat exchanger, that is, the maximum wind speed appears in the middle of the heat exchanger, which is the optimal state.

[0042] The heat exchange medium is pumped into the distribution tube by an external pump, and then evenly distributed to each section of the serpentine heat exchange tube by a distributor. The straight section of each serpentine heat exchange tube is in full contact with the inner surface of the heat dissipation fins in the heat exchange chamber. Then, the air or water driven by the fan exchanges heat fully between the fin surface and the straight section. Finally, the heat exchange medium becomes gaseous and is discharged into the working environment for heat exchange with the surrounding environment. After the heat exchange, it becomes liquid again and is collected, and then the cycle repeats.

[0043] The first and second heat exchangers have the same shape. The tops of the first and second heat exchangers form an inverted V-shaped heat exchanger with an included angle α. This can solve the problem of bottom icing in low-temperature heat pump air conditioners during defrosting and optimize the energy utilization efficiency of the unit under partial load.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A V-type heat exchanger, characterized in that, It includes: First heat exchanger; And a second heat exchanger; The first heat exchanger and the second heat exchanger have the same shape, and the tops of the first heat exchanger and the second heat exchanger form an inverted V-shaped heat exchanger with an included angle α.

2. A V-type heat exchanger according to claim 1, characterized in that: Both the first and second heat exchangers include a rectangular fin assembly with a thickness, several sets of serpentine heat exchange tubes, a diverter tube, and two end caps on both sides. The rectangular fin assembly is covered with side end caps at both ends along its length, forming a heat exchange cavity. Each set of serpentine heat exchange tubes includes several straight sections and several U-shaped connecting sections, with one end of one straight section being the inlet end and the other end being the outlet end. The diverter tube is provided with a connecting pipe corresponding to each inlet end, and the diverter tube is connected to the inlet end of each set of serpentine heat exchange tubes through the corresponding connecting pipes. The straight sections of each set of serpentine heat exchange tubes are built into the heat exchange cavity, and the two end caps are provided with through holes corresponding to the inlet and outlet positions of the straight sections.

3. A V-type heat exchanger according to claim 2, characterized in that: The end cap includes a base plate and four surrounding plates, wherein the area of ​​the base plate is larger than the side area of ​​the rectangular fin assembly.

4. A V-type heat exchanger according to claim 3, characterized in that: The surrounding plate includes a pair of long plates and a pair of short plates. The pair of long plates have positioning holes at both ends and the middle along their length, which allows the long plates of the two heat exchangers to be reliably connected through the V-shaped sheet metal parts, thereby forming an inverted V-shaped heat exchanger with an angle of α at the top of the first heat exchanger and the second heat exchanger.

5. A V-type heat exchanger according to claim 2, characterized in that: The inlet and outlet ends of each group of serpentine heat exchange tubes are located at corresponding positions on the cover plate on the same side. The inlet ends of all serpentine heat exchange tubes in the same heat exchanger correspond to one row of through holes, and the outlet ends of all serpentine heat exchange tubes in the same heat exchanger correspond to another row of through holes. The outlet ends are connected to the environmental side cavity.

6. A V-type heat exchanger according to claim 2, characterized in that: A flow divider is installed inside the flow divider tube, which divides the flow into branches equal to the number of serpentine heat exchange tubes.

7. A V-type heat exchanger according to claim 2, characterized in that: Both ends of the rectangular fin assembly are fin layers, and the exposed end surface is the windward fin layer, which is coated with a hydrophilic coating.

8. A V-type heat exchanger according to claim 2, characterized in that: When the included angle α = 30°, the wind speed on the windward side of the fin layer gradually increases along the height of the heat exchanger. The maximum speed is located at the top of the heat exchanger, and the minimum speed is located at the bottom of the heat exchanger. The difference between the maximum and minimum speeds is 4 times.

9. A V-type heat exchanger according to claim 2, characterized in that: When the included angle α = 60°, the wind speed on the windward side of the fin layer gradually increases along the height of the heat exchanger. The maximum speed is located at the top of the heat exchanger, and the minimum speed is located at the bottom of the heat exchanger. The difference between the maximum and minimum speeds is twice.

10. A V-type heat exchanger according to claim 2, characterized in that: When the included angle α = 90°, the wind speed distribution of the windward fin layer is basically symmetrical along the height direction of the heat exchanger, that is, the maximum wind speed appears in the middle of the heat exchanger.

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