Refrigerating and heating dual-purpose fin type heat exchanger flow path structure and refrigerating or heating equipment

Abstract

The utility model relates to a refrigerating and heating dual-purpose fin type heat exchanger flow path structure and refrigerating or heating equipment, which comprises a plurality of heat exchange tube columns, and the heat exchange tube columns are arranged in the direction from the windward side to the leeward side of a heat exchange fin; the refrigerant liquid pipe and the refrigerant gas pipe are respectively connected into each heat exchange pipe column; the system further comprises a middle flow path set, the middle flow path set comprises a single-connection flow path and a bridging flow path set, and the single-connection flow path and the bridging flow path set are connected into the refrigerant liquid pipe and the refrigerant gas pipe correspondingly. A plurality of heat exchange pipes in the heat exchange pipe column between the windward side and the leeward side are communicated in series through a single-connection flow path; and the heat exchange tube columns close to the windward side and the heat exchange tube columns close to the leeward side are directly communicated with each other by connecting the bridging flow path group. According to the fin type heat exchanger, a refrigerant flow path of the heat exchanger can be optimized, so that the fin type heat exchanger has a more uniform heat exchange effect.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump heat exchanger equipment, in particular to a flow path structure of a fin heat exchanger for both refrigeration and heating and a refrigeration or heating device. Background Art

[0002] Finned heat exchangers are widely used in heating or refrigeration equipment such as air source heat pumps, especially in pool heat pump cold and hot water units. The machine uses a fan to drive air to enter from one side of the fin heat exchanger and flow out from the other side, enabling the refrigerant in the heat exchanger to exchange heat with the air flow passing through the fin heat exchanger. As Figure 1 and Figure 2 shown, the finned heat exchangers commonly used in conventional pool heat pump cold and hot water units are generally two-row pipes or three-row pipes, and the pipe orifices of each row are connected in series between the liquid pipe and the gas pipe. When the fin heat exchanger is used as an evaporator, the refrigerant flows into each row of pipes of the fin heat exchanger from the liquid pipe, absorbs heat and vaporizes in the pipes, and then flows out from the gas pipe. Under the action of the compressor, the refrigerant transfers heat to water to achieve the water heating effect; on the contrary, when the fin heat exchanger is used as a condenser, the refrigerant flows into each row of pipes of the fin heat exchanger from the gas pipe, liquefies and releases heat in the pipes, and then flows out from the liquid pipe. Under the action of the throttling mechanism, the water is cooled after releasing heat under the action of the refrigerant to achieve the refrigeration effect. The relatively common fin heat exchanger structure can be referred to Figure 1 and Figure 2 shown. It generally has three rows of heat exchange pipes arranged longitudinally. The three rows of heat exchange pipes are divided into 36 orifices arranged vertically. The liquid pipe and the gas pipe responsible for inputting the refrigerant are respectively provided with 18 parallel branch pipelines. The 18 branch pipelines are respectively connected in series with two orifices in each row of heat exchange pipes. This existing pipeline structure will make the flow path of the heat exchanger too short, the flow distance of the refrigerant in the fin heat exchanger is short, the condensation or vaporization in the pipes of the fin heat exchanger is insufficient, and during the process of the air flow of the fan entering the fin heat exchanger, the first row of heat exchange pipes closest to the left side is located on the windward side of the heat exchanger, so the heat exchange effect of this row of heat exchange pipes is better, while the third row of heat exchange pipes closest to the right side is located on the leeward side of the heat exchanger, so the heat exchange effect of this row of heat exchange pipes is poor, resulting in uneven heat exchange of the heat exchanger and having certain defects. This kind of flow path design will also cause uneven flow distribution when the fin heat exchanger is used as an evaporator in the heating operating condition of the pool heat pump cold and hot water unit, resulting in poor heat exchange effect. In low-temperature operating conditions, icing even occurs at the bottom of the heat exchanger, resulting in a long defrosting cycle and incomplete defrosting; when operating in the refrigeration condition, when the fin heat exchanger is used as a condenser, the heat exchange efficiency is low, resulting in high power consumption of the whole machine and high compressor exhaust temperature. Therefore, it is very difficult for the conventional fin heat exchanger flow path to balance the refrigeration / heating conditions of the pool heat pump cold and hot water unit. Summary of the Utility Model

[0003] To solve at least one of the above-mentioned technical problems existing in the prior art, the present utility model provides a flow path structure of a fin heat exchanger for both refrigeration and heating, and a refrigeration or heating device, which can optimize the refrigerant flow path of the heat exchanger and make the fin heat exchanger have a more uniform heat exchange effect.

[0004] A flow path structure of a fin heat exchanger for both refrigeration and heating according to the present utility model includes:

[0005] A plurality of heat exchange tube columns, each including a plurality of vertically arranged heat exchange tubes, and each of the heat exchange tube columns is used to connect the heat exchange fins in the heat pump in series and is arranged in the direction from the windward side to the leeward side of the heat exchange fins;

[0006] A refrigerant liquid pipe and a refrigerant gas pipe, the refrigerant liquid pipe and the refrigerant gas pipe are respectively connected to each of the heat exchange tube columns; it also includes a middle flow path group, and the middle flow path group includes:

[0007] A single connection flow path and a cross-connection flow path group, the single connection flow path and the cross-connection flow path group are respectively connected to the refrigerant liquid pipe and the refrigerant gas pipe;

[0008] Among them, a plurality of heat exchange tubes among the heat exchange tube columns located between the windward side and the leeward side are connected in series and communicated through the single connection flow path;

[0009] The heat exchange tube column close to the windward side and the heat exchange tube column close to the leeward side are directly connected to each other through the access of the cross-connection flow path group.

[0010] According to a flow path structure of a fin heat exchanger for both refrigeration and heating of the present utility model, the cross-connection flow path group includes:

[0011] A first cross-connection flow path, with both ends respectively connected to the refrigerant liquid pipe and the refrigerant gas pipe, and the first cross-connection flow path straddles the heat exchange tube columns located between the windward side and the leeward side; a plurality of heat exchange tubes among the heat exchange tube columns close to the windward side are connected in series by one end of the first cross-connection flow path, and a plurality of heat exchange tubes among the heat exchange tube columns close to the leeward side are connected in series by the other end of the first cross-connection flow path;

[0012] A second cross-connection flow path, with both ends respectively connected to the refrigerant liquid pipe and the refrigerant gas pipe, and the second cross-connection flow path straddles the heat exchange tube columns located between the windward side and the leeward side; a plurality of heat exchange tubes among the heat exchange tube columns close to the leeward side are connected in series by one end of the second cross-connection flow path, and a plurality of heat exchange tubes among the heat exchange tube columns close to the windward side are connected in series by the other end of the second cross-connection flow path.

[0013] According to a flow path structure of a fin heat exchanger for both refrigeration and heating of the present utility model, the first cross-connection flow path and the second cross-connection flow path are adapted to cross and avoid each other on the heat exchange fins.

[0014] A flow path structure of a fin heat exchanger for both refrigeration and heating according to the present utility model:

[0015] The lower ends of the first cross-connecting flow path, the second cross-connecting flow path, and the single-connecting flow path are respectively connected to the refrigerant liquid pipe;

[0016] The upper ends of the first cross-connecting flow path, the second cross-connecting flow path, and the single-connecting flow path are respectively connected to the refrigerant gas pipe.

[0017] A flow path structure of a fin heat exchanger for both refrigeration and heating according to the present utility model:

[0018] The number of heat exchange tubes serially connected at the upper and lower ends of the first cross-connecting flow path is the same;

[0019] The number of heat exchange tubes serially connected at the upper and lower ends of the second cross-connecting flow path is the same;

[0020] The number of heat exchange tubes serially connected to the single-connecting flow path, the first cross-connecting flow path, and the second cross-connecting flow path is the same.

[0021] A flow path structure of a fin heat exchanger for both refrigeration and heating according to the present utility model:

[0022] The number of the middle flow path groups is multiple, and each middle flow path group is vertically distributed;

[0023] Among them, the number of heat exchange tubes serially connected to the single-connecting flow path, the first cross-connecting flow path, and the second cross-connecting flow path of each middle flow path group is at least 8.

[0024] According to a flow path structure of a fin heat exchanger for both refrigeration and heating of the present utility model, the number of the single-connecting flow path, the first cross-connecting flow path, or the second cross-connecting flow path is greater than or equal to 1.

[0025] According to a flow path structure of a fin heat exchanger for both refrigeration and heating of the present utility model, it further includes a top flow path for being arranged at a position close to the top of the heat exchange fins, and both ends of the top flow path are respectively communicated with the refrigerant liquid pipe and the refrigerant gas pipe;

[0026] Among them, the top flow path makes adjacent heat exchange tube columns communicate with each other by serially connecting at least two heat exchange tubes in each heat exchange tube column.

[0027] According to a flow path structure of a fin heat exchanger for both refrigeration and heating of the present utility model, the number of the heat exchange tube columns is three;

[0028] The refrigerant liquid pipe includes a main liquid pipe, and 13 liquid distribution pipes are connected in parallel to the main liquid pipe, and each liquid distribution pipe is respectively connected to each heat exchange tube column;

[0029] The refrigerant gas pipe includes a main pipe, and 13 branch pipes are connected in parallel to the main pipe, and each branch pipe is respectively connected to each longitudinal row of the heat exchange pipes.

[0030] Based on the above, the present invention also discloses a refrigeration or heating device, the structure of which includes the refrigeration and heating dual-purpose fin heat exchanger flow path structure of the present invention.

[0031] In the refrigeration and heating dual-purpose fin heat exchanger flow path structure of the present invention, a cross-connecting flow path group and a single-connecting flow path are provided on the refrigerant pipeline of the heat exchanger. In order to balance the heat exchange effects on both sides of the fin heat exchanger, the longitudinal rows of heat exchange pipes close to the windward side and the longitudinal rows of heat exchange pipes close to the leeward side are directly connected to each other by accessing the cross-connecting flow path group, that is, the cross-connecting flow path group directly crosses the longitudinal rows of heat exchange pipes between the windward side and the leeward side, so that the longitudinal rows of heat exchange pipes on the windward side are directly connected to the longitudinal rows of heat exchange pipes on the leeward side, which is beneficial to solving the problem of uneven heat exchange of the pipelines on both sides in the existing fin heat exchangers. And several heat exchange pipes among the longitudinal rows of heat exchange pipes between the windward side and the leeward side are connected in series through the single-connecting flow path, so that the longitudinal rows of heat exchange pipes in the middle of the fin heat exchanger operate independently between the longitudinal rows of heat exchange pipes on the windward side and the leeward side. By this structure, the refrigerant flow path of the heat exchanger is optimized, so that the fin heat exchanger has a more uniform heat exchange effect. Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is the flow path structure diagram of the fin heat exchanger in the prior art (as a schematic diagram of the refrigerant flow direction in the evaporator state);

[0034] Figure 2 is the flow path structure diagram of the fin heat exchanger in the prior art (as a schematic diagram of the refrigerant flow direction in the condenser state);

[0035] Figure 3 is the flow path structure diagram of the present invention (as a schematic diagram of the refrigerant flow direction in the evaporator state);

[0036] Figure 4 is the flow path structure diagram of the present invention (as a schematic diagram of the refrigerant flow direction in the condenser state).

[0037] Reference Signs:

[0038] 100, middle flow path group;

[0039] 200. Bottom flow path group, 201. First open circulation flow path, 202. Second open circulation flow path, 203. Third open circulation flow path;

[0040] 1. Heat exchange tube column, 11. Heat exchange tube;

[0041] 2. Refrigerant liquid pipe, 21. Main liquid pipe, 22. Distribution pipe;

[0042] 3. Refrigerant gas pipe, 31. Main gas pipe, 32. Branch gas pipe;

[0043] 4. Single connection flow path;

[0044] 5. First cross-connection flow path;

[0045] 6. Second cross-connection flow path;

[0046] 7. Top flow path. Detailed implementation manner

[0047] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0048] As Figures 3 to 4As shown in the figure, a fin heat exchanger flow path structure according to this embodiment includes three heat exchange tube columns 1 formed on heat exchange fins, a refrigerant liquid pipe 2, a refrigerant gas pipe 3, and a middle flow path group 100. Each heat exchange tube column 1 includes a plurality of vertically arranged heat exchange tubes 11. Each heat exchange tube column 1 is used to connect the heat exchange fins in the heat pump in series. The three heat exchange tube columns 1 are arranged in the direction from the windward side to the leeward side of the heat exchange fins, and the refrigerant liquid pipe 2 and the refrigerant gas pipe 3 are respectively connected to each heat exchange tube column 1. Among them, the structure of the middle flow path group 100 includes a single connection flow path 4 and a cross-connection flow path group. The single connection flow path 4 and the cross-connection flow path group are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3. The heat exchange tubes 11 in the heat exchange tube column 1 (i.e., the second heat exchange tube column 1 from the left) between the windward side and the leeward side are connected in series through the single connection flow path 4, and the heat exchange tube column 1 close to the windward side (i.e., the first heat exchange tube column 1 from the left) and the heat exchange tube column 1 close to the leeward side (i.e., the third heat exchange tube column 1 from the left) are directly connected to each other through the cross-connection flow path group. It can be understood that the flow path structure solution of this embodiment first sets a cross-connection flow path group and a single connection flow path 4 on the refrigerant pipeline of the heat exchanger. In order to balance the heat exchange effects on both sides of the fin heat exchanger, the heat exchange tube column 1 close to the windward side (i.e., the first heat exchange tube column 1 from the left) and the heat exchange tube column 1 close to the leeward side (i.e., the third heat exchange tube column 1 from the left) are directly connected to each other through the cross-connection flow path group, that is, the cross-connection flow path group directly crosses the heat exchange tube column 1 (i.e., the second heat exchange tube column 1 from the left) between the windward side and the leeward side, so that the heat exchange tube column 1 on the windward side is directly connected to the heat exchange tube column 1 on the leeward side, which is beneficial to solving the problem of uneven heat exchange of the pipelines on both sides in the existing fin heat exchanger. And a plurality of heat exchange tubes 11 in the heat exchange tube column 1 between the windward side and the leeward side are connected in series through the single connection flow path 4, so that the heat exchange tube column 1 in the middle of the fin heat exchanger operates independently between the heat exchange tube columns 1 on the windward side and the leeward side. Through this structure, the refrigerant flow path of the heat exchanger is optimized, so that the fin heat exchanger has a more uniform heat exchange effect.

[0049] Regarding the above-mentioned cross-connecting flow path group structure, specifically, the structure of the cross-connecting flow path group includes a first cross-connecting flow path 5 and a second cross-connecting flow path 6. The first cross-connecting flow path 5 and the second cross-connecting flow path 6 cross and avoid each other on the heat exchange fins. The two ends of the first cross-connecting flow path 5 are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3, and the two ends of the second cross-connecting flow path 6 are also respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3. In addition, the first cross-connecting flow path 5 straddles the longitudinal row of heat exchange tubes 1 between the windward side and the leeward side. Among the 4 heat exchange tubes 11 in the longitudinal row of heat exchange tubes 1 close to the windward side, the lower ends are connected in series by the first cross-connecting flow path 5, and among the 4 heat exchange tubes 11 in the longitudinal row of heat exchange tubes 1 close to the leeward side, the upper ends are connected in series by the first cross-connecting flow path 5. The second cross-connecting flow path 6 also straddles the longitudinal row of heat exchange tubes 1 between the windward side and the leeward side. Among the 4 heat exchange tubes 11 in the longitudinal row of heat exchange tubes 1 close to the leeward side, the lower ends are connected in series by the second cross-connecting flow path 6, and among the 4 heat exchange tubes 11 in the longitudinal row of heat exchange tubes 1 close to the windward side, the upper ends are connected in series by the second cross-connecting flow path 6. In this structure, part of the flow paths of the first longitudinal row of heat exchange tubes 1 and the third longitudinal row of heat exchange tubes 1 from the left are arranged in a way that the first cross-connecting flow path 5 and the second cross-connecting flow path 6 cross each other. Since the first longitudinal row of heat exchange tubes 1 from the left is on the windward side of the heat exchanger and has a better heat exchange effect, while the third longitudinal row of heat exchange tubes 1 from the left is on the leeward side of the heat exchanger and has a poorer heat exchange effect, the pipeline structure with the first cross-connecting flow path 5 and the second cross-connecting flow path 6 arranged crosswise can balance the heat exchange effects of the first row of heat exchange tubes 11 and the third row of heat exchange tubes 11, and indirectly make the refrigerant distribution more uniform.

[0050] In one embodiment, the lower end of the first cross-connecting flow path 5, the lower end of the second cross-connecting flow path 6, and the lower end of the single-connecting flow path 4 are respectively connected to the refrigerant liquid pipe 2, and the upper end of the first cross-connecting flow path 5, the upper end of the second cross-connecting flow path 6, and the upper end of the single-connecting flow path 4 are respectively connected to the refrigerant gas pipe 3. Through the above pipeline structure, when the heat exchanger is in the heating condition, the refrigerant can flow in the way of entering from the bottom and flowing out from the top, and when in the refrigeration condition, the refrigerant flows in the way of entering from the top and flowing out from the bottom. This way can better conform to the heat exchange characteristics of the refrigerant and has a better heat exchange effect. That is to say, when the finned heat exchanger is used as an evaporator in the heating condition (as Figure 3 shown), the refrigerant enters the lower ends of the first cross-connecting flow path 5, the second cross-connecting flow path 6, and the single-connecting flow path 4 respectively from the refrigerant liquid pipe 2. Taking the first cross-connecting flow path 5 as an example, at this time, the refrigerant entering from the lower end of the first cross-connecting flow path 5 is in a liquid state and has a large density. Let the liquid refrigerant flow from the lower end to the upper end of the first cross-connecting flow path 5, that is, let the liquid refrigerant flow from bottom to top. As the refrigerant continuously absorbs heat, the liquid slowly turns into gas and the volume increases. During the process of flowing from bottom to top, the vaporized part of the refrigerant will not cause obvious resistance and pressure to the liquid refrigerant, which is beneficial to reducing the pressure drop during the refrigerant circulation and thus improving the heat exchange efficiency. Similarly, when the heat exchanger is in the refrigeration condition and the finned heat exchanger is used as a condenser (asFigure 4 As shown, the refrigerant enters the upper ends of the first cross-connecting flow path 5, the second cross-connecting flow path 6, and the single-connecting flow path 4 from the refrigerant gas pipe. Taking the first cross-connecting flow path 5 as an example, the refrigerant entering from the upper end of the first cross-connecting flow path 5 at this time is high-pressure gas. During the process of flowing downward in the first cross-connecting flow path 5, as the refrigerant continuously releases heat, it slowly turns into liquid. Due to gravity, the transformed liquid refrigerant can flow more smoothly downward. At this time, it is beneficial to reduce the pressure drop of the refrigerant cycle and improve the heat exchange efficiency. Therefore, the flow path design of the heat exchanger in this application follows the flow characteristics of the refrigerant under different working conditions, conforms to its different flow directions, reduces the flow resistance of the refrigerant, and improves the heat exchange efficiency.

[0051] In one embodiment, the number of heat exchange tubes 11 connected in series at the upper end of the first cross-connecting flow path 5 is the same as the number of heat exchange tubes 11 connected in series at the lower end of the first cross-connecting flow path 5. Similarly, the number of heat exchange tubes 11 connected in series at the upper end of the second cross-connecting flow path 6 is the same as the number of heat exchange tubes 11 connected in series at the lower end of the second cross-connecting flow path 6, and the number of heat exchange tubes 11 connected in series by the single-connecting flow path 4, the first cross-connecting flow path 5, and the second cross-connecting flow path 6 is the same. Specifically, in this embodiment, the number of heat exchange tubes 11 connected in series at the upper and lower ends of the first cross-connecting flow path 5 is 4 each, totaling 8. The number of heat exchange tubes 11 connected in series at the upper and lower ends of the second cross-connecting flow path 6 is also 4 each, totaling 8. The number of heat exchange tubes 11 connected in series by the single-connecting flow path 4 is 8, which is the same as the number of heat exchange tubes 11 connected in series by the first cross-connecting flow path 5 and the second cross-connecting flow path 6. Through the above structure, it is beneficial for the heat exchanger to have a more uniform heat exchange effect during operation.

[0052] In one embodiment, specifically, the refrigerant liquid pipe 2 includes a main liquid pipe 21, and 13 branch liquid pipes 22 are connected in parallel to the main liquid pipe 21. Each branch liquid pipe 22 is respectively connected to each heat exchange tube column 1. The refrigerant gas pipe 3 includes a main gas pipe 31, and 13 branch gas pipes 32 are connected in parallel to the main gas pipe 31. Each branch gas pipe 32 is respectively connected to each heat exchange tube column 1. More specifically, the number of the middle flow path groups 100 is 3, and each middle flow path group 100 is vertically distributed. The number of the single-connection flow paths 4, the first cross-connection flow paths 5, and the second cross-connection flow paths 6 in one middle flow path group 100 is greater than or equal to 1. Specifically, in this embodiment, when the number of the heat exchange tube columns 1 is three columns, one middle flow path group 100 only includes one single-connection flow path 4, one first cross-connection flow path 5, and one second cross-connection flow path 6. However, optionally, when the number of the heat exchange tube columns 1 is several columns (for example, five columns), the first cross-connection flow path 5 and the second cross-connection flow path 6 can be respectively set to one, the single-connection flow path 4 is set to 3, or the first cross-connection flow path 5 and the second cross-connection flow path 6 can be respectively set to two, and the single-connection flow path 4 is set to 1. In addition, specifically, the number of the heat exchange tubes 11 that the single-connection flow paths 4, the first cross-connection flow paths 5, and the second cross-connection flow paths 6 in each middle flow path group 100 are connected in series to is 8 respectively. That is to say, the above-mentioned 13 branch liquid pipes 22 are respectively connected in series to 8 heat exchange tubes 11 through the single-connection flow paths 4, the first cross-connection flow paths 5, and the second cross-connection flow paths 6. And the above-mentioned 13 branch gas pipes 32 are also respectively connected in series to 8 heat exchange tubes 11 through the single-connection flow paths 4, the first cross-connection flow paths 5, and the second cross-connection flow paths 6. It can be understood that compared with the traditional heat exchanger flow path structure, in this application, the number of the branch liquid pipes 22 and the branch gas pipes 32 is reduced to 13, and the number of the heat exchange tubes 11 that each branch liquid pipe 22 and each branch gas pipe 32 are respectively connected in series to is increased to 8, which can extend the length of a single flow path, and the lengths of all flow paths are the same. Because the heat exchanger has a horizontal air outlet, the air speed of the whole heat exchanger is relatively uniform, and the flow path lengths are the same, which can make the refrigerant distribution more uniform. The flow path of the conventional heat exchanger is too short. When the heat exchanger operates in the refrigeration condition and is used as a condenser, due to insufficient condensation of the refrigerant, the heat exchange effect is poor, resulting in higher power consumption and poorer refrigeration effect. The heat exchanger flow path provided by the solution of the present utility model is significantly extended, the flow path lengths of the refrigeration and heating conditions are balanced, thereby improving the heat exchange effect under the refrigeration condition and solving the heat exchange problem under the refrigeration condition.

[0053] In one embodiment, a top flow path 7 is further provided at a position close to the top of the heat exchange fins. The two ends of the top flow path 7 are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3 through communication. Specifically, the lower end of the top flow path 7 is connected to the main liquid pipe 21 through the access liquid distribution pipe 22, and the upper end of the top flow path 7 is connected to the main gas pipe 31 through the access gas distribution pipe 32. Among them, the top flow path 7 connects adjacent heat exchange tube columns 1 to each other by connecting at least two heat exchange tubes 11 in three heat exchange tube columns 1 in series. Specifically, in this embodiment, after the top flow path 7 is connected in series from bottom to top to two heat exchange tubes 11 in the first heat exchange tube column 1 from the left, it continues to extend to the right, and is connected in series from top to bottom to two heat exchange tubes 11 in the second heat exchange tube column 1 from the left, and then continues to extend to the right, and is connected in series from bottom to top to two heat exchange tubes 11 in the third heat exchange tube column 1 from the left. Finally, it extends to the left and returns to connect to the second heat exchange tube column 1 from the left, and is connected in series from bottom to top to two other heat exchange tubes 11 at higher positions in the second heat exchange tube column 1 from the left. After the above connection in series is completed, the upper end of the top flow path 7 is connected to the main gas pipe 31 through the access gas distribution pipe 32. Therefore, the top flow path 7 can be responsible for supplementarily connecting the heat exchange tubes 11 that are not connected in series by each middle flow path group 100 at the top of the heat exchange fins.

[0054] In one embodiment, a bottom flow path group 200 is further provided near the bottom of the heat exchange fins. Specifically, the structure of the bottom flow path group 200 includes a first open circulation flow path 201, a second open circulation flow path 202, and a third open circulation flow path 203. However, among the heat exchange tube columns 1 near the bottom of the heat exchange fins, four heat exchange tubes 11 with relatively higher arrangement positions in the heat exchange tube column 1 adjacent to the windward side (i.e., the first heat exchange tube column 1 from the left) are connected in series by one end of the first open circulation flow path 201, and four heat exchange tubes 11 with relatively lower arrangement positions in the heat exchange tube column 1 adjacent to the leeward side (i.e., the third heat exchange tube column 1 from the left) are connected in series by the other end of the first open circulation flow path 201; four heat exchange tubes 11 with relatively lower arrangement positions in the heat exchange tube column 1 adjacent to the windward side (i.e., the first heat exchange tube column 1 from the left) are connected in series by one end of the second open circulation flow path 202, and four heat exchange tubes 11 with relatively higher arrangement positions in the heat exchange tube column 1 adjacent to the leeward side (i.e., the third heat exchange tube column 1 from the left) are connected in series by the other end of the second open circulation flow path 202; four heat exchange tubes 11 with relatively higher arrangement positions and four heat exchange tubes 11 with relatively lower arrangement positions in the heat exchange tube column 1 located between the windward side and the leeward side (i.e., the second heat exchange tube column 1 from the left) are respectively connected in series by both ends of the third open circulation flow path 203. More specifically, on the windward side of the heat exchange fins, the lower end of the first open circulation flow path 201 is connected to the refrigerant liquid pipe 2, and the upper end of the second open circulation flow path 202 is connected to the refrigerant gas pipe 3; on the leeward side of the heat exchange fins, the upper end of the first open circulation flow path 201 is connected to the refrigerant gas pipe 3, and the lower end of the second open circulation flow path 202 is connected to the refrigerant liquid pipe 2; between the windward side and the leeward side of the heat exchange fins, the lower end of the upper section flow path of the third open circulation flow path 203 is connected to the refrigerant liquid pipe 2, and the upper end of the lower section flow path of the third open circulation flow path 203 is connected to the refrigerant gas pipe 3.

[0055] It can be understood that in the above structure, the 11th, 12th, and 13th liquid distribution pipes 22 connected to the bottom of the main liquid pipe 21 adopt a cross - pipe layout with upper and lower cross - pipes. And the heat exchange tubes 11 near the bottom of the heat exchange fins do not adopt the connection structure of the middle flow path group 100, but are connected by the structure of three open circulation flow paths. This is equivalent to using a cross - pipe layout combined with upper and lower cross - pipes to cross - set the flow paths of the first row of heat exchange tubes and the third row of heat exchange tubes, balancing the heat exchange effects on the leeward side and the windward side. The reason for adopting this method is that in the conventional layout of the bottom flow path of the heat exchanger, under the low - temperature heating condition, it will cause the bottom temperature to be low and serious frosting. If the water drainage in the water receiving tray is not smooth, it will cause the bottom of the heat exchanger to freeze, further deteriorating the heat exchange of the evaporator, resulting in a longer defrosting time and incomplete defrosting. However, by using the upper and lower cross - pipes in this embodiment, combined with the cross - pipe layout method, the heat exchange is more uniform, the bottom temperature will not be very low, and the phenomenon of ice formation at the bottom of the heat exchanger can be effectively avoided, improving the heat exchange effect of the evaporator.

[0056] In addition, this embodiment further provides a refrigeration or heating device, the structure of which includes the above-described heat pump fin heat exchanger flow path structure.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling and heating dual-purpose fin heat exchanger flow path structure, comprising: A plurality of heat exchange tube longitudinal rows (1), each comprising a plurality of heat exchange tubes (11) arranged vertically, each of the heat exchange tube longitudinal rows (1) being arranged in a direction from the windward side to the leeward side of the heat exchange fin; A refrigerant liquid pipe (2) and a refrigerant gas pipe (3), wherein the refrigerant liquid pipe (2) and the refrigerant gas pipe (3) are respectively connected to each of the heat exchange tube vertical rows (1); characterized in that it also includes a middle flow path group (100), and the middle flow path group (100) includes: A single-connection flow path (4) and a jumper flow path group, wherein the single-connection flow path (4) and the jumper flow path group are respectively connected to the refrigerant liquid pipe (2) and the refrigerant gas pipe (3); Wherein, a plurality of heat exchange tubes (11) in the heat exchange tube column (1) between the windward side and the leeward side are connected in series via the single-connection flow path (4); The heat exchange tube column (1) close to the windward side and the heat exchange tube column (1) close to the leeward side are directly connected to each other by being connected to the cross-connection flow path group.

2. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 1 is characterized in that: The crossover flow path group comprises: A first jumper flow path (5), the two ends of which are respectively connected to the refrigerant liquid pipe (2) and the refrigerant gas pipe (3), and the first jumper flow path (5) crosses the heat exchange tube column (1) between the windward side and the leeward side; a plurality of heat exchange tubes (11) in the heat exchange tube column (1) close to the windward side are connected in series by one end of the first jumper flow path (5), and a plurality of heat exchange tubes (11) in the heat exchange tube column (1) close to the leeward side are connected in series by the other end of the first jumper flow path (5); The second jumper flow path (6) has two ends respectively connected to the refrigerant liquid pipe (2) and the refrigerant gas pipe (3), and the second jumper flow path (6) crosses the heat exchange tube column (1) between the windward side and the leeward side; a plurality of heat exchange tubes (11) in the heat exchange tube column (1) close to the leeward side are connected in series by one end of the second jumper flow path (6), and a plurality of heat exchange tubes (11) in the heat exchange tube column (1) close to the windward side are connected in series by the other end of the second jumper flow path (6).

3. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 2 is characterized in that: The first cross-connection flow path (5) and the second cross-connection flow path (6) are suitable for crossing and avoiding each other on the heat exchange fins.

4. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 2 is characterized in that: The lower end of the first jumper flow path (5), the lower end of the second jumper flow path (6) and the lower end of the single-connection flow path (4) are respectively connected to the refrigerant liquid pipe (2); The upper end of the first jumper flow path (5), the upper end of the second jumper flow path (6) and the upper end of the single-connection flow path (4) are respectively connected to the refrigerant gas pipe (3).

5. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 4 is characterized in that: The upper and lower ends of the first cross-connection flow path (5) are connected in series to the same number of heat exchange tubes (11); The upper and lower ends of the second cross-connection flow path (6) are connected in series to the same number of heat exchange tubes (11); The single-connection flow path (4), the first cross-connection flow path (5), and the second cross-connection flow path (6) are connected in series to the heat exchange tube (11) in the same number.

6. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 2 is characterized in that: There are a plurality of middle flow path groups (100), and each middle flow path group (100) is distributed vertically.

7. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 6 is characterized in that: The number of the single-connection flow path (4), the first cross-connection flow path (5) or the second cross-connection flow path (6) is greater than or equal to 1.

8. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 2 is characterized in that: It also includes a top flow path (7) for being arranged near the top of the heat exchange fin, and the two ends of the top flow path (7) are respectively connected to the refrigerant liquid pipe (2) and the refrigerant gas pipe (3); The top flow path (7) connects at least two heat exchange tubes (11) in series in each heat exchange tube column (1) so that adjacent heat exchange tube columns (1) are interconnected.

9. The cooling and heating dual-purpose fin heat exchanger flow path structure according to claim 1, characterized in that: The number of the heat exchange tube vertical rows (1) is three; The refrigerant liquid pipe (2) comprises a main liquid pipe (21), and 13 liquid distribution pipes (22) are connected in parallel to the main liquid pipe (21), and each liquid distribution pipe (22) is respectively connected to each of the heat exchange tube vertical rows (1); The refrigerant gas pipe (3) comprises a main gas pipe (31), to which 13 branch gas pipes (32) are connected in parallel, and each branch gas pipe (32) is respectively connected to each of the heat exchange tube vertical rows (1).

10. A cooling or heating device, characterized in that: It comprises the flow path structure of the fin heat exchanger for cooling and heating as described in any one of claims 1 to 9.

Images