Heat exchanger fin, heat exchanger, heat pump system and electrical equipment

Abstract

An embodiment of the present invention provides a heat exchanger fin, which includes: a base sheet and a plurality of bridge sheets arranged on the base sheet and used to cut a heat exchange airflow, wherein the bridge sheets are provided with bridge sheet holes penetrating the bridge sheets in a thickness direction. The heat exchanger fin in the embodiment of the present invention further destroys the boundary layer of the heat exchange airflow flowing through the heat exchanger fin by arranging bridge sheet holes on the bridge sheets, effectively improves the air side convective heat transfer coefficient, significantly reduces thermal resistance, and reduces pressure drop, thereby further improving the heat exchange effect of the heat exchanger fin.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliances, and in particular to a heat exchanger fin, a heat exchanger, a heat pump system and electrical equipment. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger.

[0003] The finned heat exchanger achieves the purpose of enhancing heat transfer by adding fins to the heat dissipation tubes used to transmit fluid.

[0004] In the related art, the heat transfer efficiency of the traditional fin heat exchanger is low and the pressure drop is large. Summary of the invention

[0005] In view of this, an embodiment of the present application hopes to provide a heat exchanger fin that can improve the heat exchange effect.

[0006] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0007] An embodiment of the present invention provides a heat exchanger fin, the heat exchanger fin comprising:

[0008] substrate;

[0009] A plurality of bridge pieces are arranged on the base piece and used for cutting the heat exchange airflow, and the bridge pieces are provided with bridge piece holes penetrating the bridge pieces along the thickness direction.

[0010] In some embodiments, a plurality of the bridge sheets are punched from the base sheet.

[0011] In some embodiments, the equivalent diameter of the bridge plate holes does not exceed one half of the size of the bridge plate along the flow direction of the heat exchange gas flow.

[0012] In some embodiments, along the flow direction of the heat exchange airflow, two adjacent bridge pieces are protrudingly disposed on opposite sides of the base piece.

[0013] In some embodiments, along the flow direction of the heat exchange gas flow, the equivalent diameter of the upstream bridge plate holes is not less than the equivalent diameter of the downstream bridge plate holes.

[0014] In some embodiments, all the bridge plates of the heat exchanger fins are divided into multiple bridge plate groups, the equivalent diameters of the bridge plate holes in each bridge plate group are the same, and the bridge plate groups are arranged in sequence along the flow direction of the heat exchange airflow. In two adjacent bridge plate groups, the equivalent diameter of the bridge plate holes in the downstream bridge plate group is 0.7 to 0.8 of the equivalent diameter of the bridge plate holes in the upstream bridge plate group.

[0015] In some embodiments, in the projection of the plane where the substrate is located, the bridge pieces of the heat exchanger fins are arranged along the same straight line.

[0016] In some embodiments, the substrate is provided with a plurality of mounting holes for the heat exchange tubes to pass through, and the mounting holes penetrate the substrate along the thickness direction of the substrate.

[0017] In some embodiments, at least one bridge piece is disposed between two adjacent mounting holes.

[0018] An embodiment of the present invention further provides a heat exchanger, comprising a heat exchange tube and a plurality of heat exchanger fins as described in any one of the preceding items, wherein the heat exchange tube is in thermal contact with the substrate; the plurality of heat exchanger fins are stacked, and an air flow channel is formed between the substrates of two adjacent heat exchanger fins, and at least part of the bridge fins extends into the air flow channel.

[0019] In some embodiments, the heat exchange tube includes a heat conductive plate, and each of the heat exchanger fins is in contact with a surface of the heat conductive plate.

[0020] In some embodiments, each of the heat exchanger fins is constructed by continuously reciprocatingly bending a metal plate.

[0021] In some embodiments, the substrate is provided with a mounting hole penetrating the substrate along the thickness direction of the substrate, and the heat exchange tube is passed through the mounting hole of each of the substrates.

[0022] An embodiment of the present invention further provides a heat pump system, characterized in that it includes a compressor, a condenser and an evaporator, and the condenser and / or the evaporator adopts the heat exchanger described in any one of the aforementioned embodiments.

[0023] An embodiment of the present invention further provides an electrical device, which includes the heat pump system described in the above embodiment.

[0024] The heat exchanger fins in the embodiment of the present invention further destroy the boundary layer of the heat exchange airflow flowing through the heat exchanger fins by setting bridge holes on the bridge fins, effectively improving the air side convective heat transfer coefficient, significantly reducing thermal resistance, and reducing pressure drop, thereby further improving the heat exchange effect of the heat exchanger fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a heat exchanger fin in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified schematic diagram of position A in the middle;

[0027] Figure 3 for Figure 1A partial schematic diagram of the heat exchanger fin in the embodiment at another viewing angle;

[0028] Figure 4 A schematic diagram of a heat exchanger fin in another embodiment of the present invention;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of position B in the middle;

[0030] Figure 6 is a schematic diagram of a heat exchanger in one embodiment of the present invention;

[0031] Figure 7 for Figure 6 A magnified schematic diagram of the C position in the middle;

[0032] Figure 8 is a schematic diagram of a heat exchanger in another embodiment of the present invention;

[0033] Fig. 9 The figure is a schematic diagram comparing the flow and heat exchange performance of a heat exchanger in one embodiment of the present invention and a heat exchanger in the related art having the same size specification but without bridge holes.

[0034] Description of Reference Numerals

[0035] Base plate 10; mounting hole 10a; bridge plate 20; bridge plate hole 20a; heat exchange tube 30; heat conducting plate 31; air flow channel 40 DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0037] In the description of this application, the orientation or position relationship of "heat exchange airflow direction" is based on the attached Figure 1 or Figure 4 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0038] The embodiment of the present invention provides a heat exchanger fin, referring to Figure 1 and Figure 4 The heat exchanger fin includes: a base sheet 10, a plurality of bridge sheets 20 arranged on the base sheet 10 and used for cutting the heat exchange airflow, and the bridge sheets 20 are provided with bridge sheet holes 20a penetrating the bridge sheets 20 along the thickness direction.

[0039] The present invention also provides a heat exchanger, see Figure 6 , Figure 7 and Figure 8 The heat exchanger includes a heat exchange tube 30 and a plurality of heat exchanger fins of any embodiment of the present application, and the heat exchange tube 30 is in thermal contact with the substrate 10. The heat exchange tube 30 is used for a fluid heat exchange medium to flow through, and the fluid heat exchange medium can be a refrigerant, water, or air, etc., which is not limited here. The fluid heat exchange medium transfers heat to the heat exchange tube 30, and the heat exchange tube 30 transfers heat to the heat exchange fins.

[0040] A plurality of heat exchanger fins are stacked, and an air flow channel 40 is formed between the substrates 10 of two adjacent heat exchanger fins. The heat exchange air flow flows through the air flow channel 40, so that heat is exchanged between the heat exchange air flow and the heat exchange fins.

[0041] It can be understood that the stacking of multiple heat exchanger fins increases the number of heat exchanger fins arranged within a unit volume, thereby improving the heat exchange effect.

[0042] It is understandable that the airflow channel 40 provides a flow space for the heat exchange airflow, restricts and guides the flow of the heat exchange airflow, and enables the heat exchange airflow to flow along a preset path or direction, which is convenient for planning and arranging the positions of the heat exchanger fins to obtain a better heat exchange effect. At least part of the bridge piece 20 is extended into the airflow channel 40, so that the bridge piece 20 cuts the heat exchange airflow flowing through the airflow channel 40 to destroy the boundary layer of the heat exchange airflow, thereby achieving a better heat exchange effect.

[0043] At least a portion of the bridge piece 20 extends into the airflow channel 40. When the heat exchange airflow flows in the airflow channel 40, the heat exchange airflow will flow through the bridge piece 20, so the bridge piece 20 will cut the heat exchange gas.

[0044] When the heat exchange airflow flows through the bridge plate 20, the bridge plate 20 cuts the heat exchange airflow, increases the disturbance effect of the heat exchange airflow, and improves the heat exchange efficiency. The bridge plate holes 20a destroy the boundary layer of the heat exchange airflow flowing through the surface of the bridge plate 20, increases the air side convection heat transfer coefficient, reduces thermal resistance, and improves the heat exchange effect. The edge of the bridge plate hole 20a can cut the airflow flowing into the bridge plate hole 20a again, further improving the heat exchange efficiency. In addition, the bridge plate hole 20a can make the airflow on both sides of the bridge plate 20 exchange and mix, generate secondary flow, and enhance the heat exchange effect.

[0045] The heat exchanger fins in the embodiment of the present invention further destroy the boundary layer of the heat exchange airflow flowing through the heat exchanger fins by setting bridge holes 20a on the bridge fins, effectively improving the air side convective heat transfer coefficient, significantly reducing thermal resistance, and reducing pressure drop, thereby further improving the heat exchange effect of the heat exchanger fins.

[0046] It can be understood that, during the contact between the substrate 10 and the heat exchange airflow, a certain heat exchange effect can be achieved through the heat conduction effect.

[0047] It can be understood that the substrate 10 and the bridge piece 20 can adopt a sub-assembly structure, that is, the substrate 10 and the bridge piece 20 are separately manufactured and then assembled and connected to form the heat exchanger fins. The connection method used is not limited, such as screw connection, bonding, welding, etc. The connection method used should reduce the impact on the heat transfer effect between the substrate 10 and the bridge piece 20.

[0048] It is understandable that the base sheet 10 and the bridge sheet 20 may also be formed in an integral structure to reduce the number of process steps in the manufacturing process.

[0049] For example, in some embodiments, the bridge piece 20 is stamped from the substrate 10. The heat exchanger fin is manufactured by stamping. On the one hand, the substrate 10 and the bridge piece 20 are made of the same plate material with the same material properties, which ensures the heat transfer effect between the substrate 10 and the bridge piece 20; on the other hand, the manufacturing process is simple and fast, suitable for batch manufacturing, reducing material costs, and can effectively reduce production costs.

[0050] Understandably, see Figure 1 and Figure 4 The bridge piece 20 formed by punching is cut at both ends along the flow direction of the heat exchange airflow, so as to achieve the purpose of the bridge piece 20 cutting the heat exchange airflow.

[0051] It can be understood that the bridge hole 20a is formed by a punching process to simplify the manufacturing process of the bridge hole 20a, improve production efficiency and reduce production costs.

[0052] It is understandable that the size of the bridge plate holes 20 a is optimized so that the bridge plate 20 has a certain structural strength while ensuring the heat exchange effect of the bridge plate holes 20 a.

[0053] In some embodiments, the equivalent diameter of the bridge hole 20a does not exceed one-half of the size of the bridge 20 along the flow direction of the heat exchange gas flow. This reduces the risk of the bridge 20 being easily deformed or even broken due to the close distance between the edge of the bridge hole 20a and the outer contour edge of the bridge 20 during the manufacturing process of the bridge hole 20a.

[0054] It should be noted that the equivalent diameter of the bridge plate hole 20 a refers to the diameter of a circle having the same area as the bridge plate hole 20 a .

[0055] The shape of the bridge hole 20a is not limited, and can be a triangular hole, a rectangular hole, etc.

[0056] Exemplarily, the bridge plate hole 20 a is a circular hole, which can reduce the stress concentration generated at the position of the bridge plate hole 20 a , which is beneficial for punching and manufacturing the bridge plate hole 20 a , and is beneficial for improving the structural strength of the bridge plate 20 .

[0057] It is understandable that the number of bridge hole 20a provided on a single bridge fin 20 can be one or more, and can be flexibly selected according to the required heat exchange effect. Multiple bridge holes 20a can continuously destroy the boundary layer of the heat exchange airflow, so that the boundary layer is maintained at a relatively thin thickness, which is conducive to improving the heat exchange efficiency.

[0058] Exemplarily, on the same heat exchanger fin, the sizes of the bridge pieces 20 are consistent, thereby facilitating the uniform production of the bridge pieces 20 and improving the manufacturing efficiency.

[0059] It is understandable that in some embodiments, the protrusion heights of different bridge pieces 20 on the surface of the substrate 10 may be different, and the height difference between different bridge pieces 20 can continuously destroy the boundary layer of the heat exchange airflow flowing through, thereby improving the heat exchange effect. In other embodiments, the protrusion heights of each bridge piece 20 on the surface of the substrate 10 are the same.

[0060] It is understandable that the protruding directions of different bridge plates 20 on the substrate 10 may be the same or different, and may be arranged according to requirements to further optimize the heat exchange effect.

[0061] For example, in some embodiments, see Figure 3 Along the flow direction of the heat exchange airflow, two adjacent bridge pieces 20 are protruded on opposite sides of the substrate 10, that is, the protruding directions of any two adjacent bridge pieces 20 on the substrate 10 are opposite. In this way, the bridge pieces 20 are arranged in an uneven and staggered manner on the substrate 10. On the one hand, the heat exchange airflow on both sides of the substrate 10 can flow through the bridge pieces 20, further enhancing the turbulence effect on the heat exchange airflow; on the other hand, bridge pieces 20 are provided on both sides of the substrate 10, which reduces the possibility of load deflection on the substrate 10 and makes the overall structure of the heat exchanger fin more stable.

[0062] In some embodiments, the bridge pieces 20 located on opposite sides of the substrate 10 are at equal distances from the substrate 10. On the one hand, it is convenient to use the same stamping die to manufacture each bridge piece 20 during stamping, thereby reducing manufacturing costs and improving production efficiency; on the other hand, the heat exchange airflow can flow more evenly on both sides of the substrate 10, thereby improving the heat exchange effect and making the forces on both sides of the substrate 10 uniform.

[0063] In some embodiments, along the flow direction of the heat exchange airflow, the bridge pieces 20 are arranged at intervals, and the portion between two adjacent bridge pieces 20 is a portion of the substrate 10. That is, after one bridge piece 20 is manufactured, another bridge piece 20 is manufactured at a certain distance along the flow direction of the heat exchange airflow. On the one hand, the heat exchange airflow flowing between two adjacent bridge pieces 20 can be cut and disturbed by the portion of the substrate 10, further improving the heat exchange efficiency; on the other hand, the overall strength is further improved, making the entire heat exchanger fin structure more stable.

[0064] In some embodiments, see Figure 2 and Figure 5 , along the flow direction of the heat exchange airflow, two adjacent bridge pieces 20 are arranged continuously. That is, the next bridge piece 20 is manufactured close to the previous bridge piece 20 along the flow direction of the heat exchange airflow. Under the premise of ensuring the structural strength requirements, as many bridge pieces 20 as possible are arranged within the same size range, further improving the destructive effect on the boundary layer of the heat exchange airflow and improving the heat exchange effect.

[0065] It is understandable that the specific sizes of the bridge plate holes 20a on different bridge plates 20 can be adjusted to improve the heat exchange effect.

[0066] In some embodiments, see Figure 1 and Figure 4 , along the flow direction of the heat exchange airflow, the equivalent diameter of the upstream bridge plate hole 20a is not less than the equivalent diameter of the downstream bridge plate hole 20a.

[0067] Among them, when the equivalent diameter of the upstream bridge plate hole 20a is equal to the equivalent diameter of the downstream bridge plate hole 20a, it is convenient for batch production of the bridge plate holes 20a, which is beneficial to reducing production costs.

[0068] When the equivalent diameter of the upstream bridge plate hole 20a is larger than the equivalent diameter of the downstream bridge plate hole 20a, since the temperature difference between the upstream bridge plate 20 and the heat exchange airflow along the flow direction of the heat exchange airflow is large, the heat exchange effect is improved by further destroying the boundary layer of the heat exchange airflow by enlarging the size of the bridge plate hole 20a; while the temperature difference between the downstream bridge plate 20 and the heat exchange airflow along the flow direction of the heat exchange airflow is small, the effect of improving the heat exchange effect by destroying the boundary layer of the heat exchange airflow is reduced, so the size of the bridge plate hole 20a is reduced, and the heat exchange effect is improved by increasing the contact area between the bridge plate 20 and the heat exchange airflow.

[0069] It should be noted that, along the flow direction of the heat exchange gas flow, upstream and downstream are relative positional relationships, rather than specific regions. That is, taking a certain bridge plate hole 20a as a position reference, the upstream bridge plate hole 20a refers to the upstream of the bridge plate hole 20a along the flow direction of the heat exchange gas flow, and the downstream bridge plate hole 20a refers to the downstream of the bridge plate hole 20a along the flow direction of the heat exchange gas flow.

[0070] In some embodiments, see Figure 1 and Figure 4 All bridge plates 20 of the heat exchanger fins are divided into a plurality of bridge plate groups (not shown in the figure), the equivalent diameter of the bridge plate holes 20a in each bridge plate group is the same, and the bridge plate groups are arranged in sequence along the flow direction of the heat exchange airflow. The bridge plate holes 20a in the same bridge plate group can be manufactured using the same method, thereby improving production efficiency and reducing production costs.

[0071] In some embodiments, in two adjacent bridge-plate groups, the equivalent diameter of the bridge-plate holes 20a in the downstream bridge-plate group is 0.7 to 0.8 of the equivalent diameter of the bridge-plate holes 20a in the upstream bridge-plate group, for example, the specific values ​​may be 0.70, 0.75, 0.80, etc. With the values ​​within the above range, the bridge-plate holes 20a along the flow direction of the heat exchange airflow gradually reduce the effect of destroying the boundary layer of the heat exchange airflow, while the effect of contact heat exchange gradually increases, so that the heat exchange effect at each position of the heat exchanger fin remains stable.

[0072] Exemplarily, the ratio of the equivalent diameters between the above bridge plate groups is a fixed value. For example, the bridge plate holes 20a of a heat exchanger fin are divided into the first group, the second group and the third group along the flow direction of the heat exchange gas flow, wherein the equivalent diameter of the bridge plate holes 20a of the second group is 0.75 of the equivalent diameter of the bridge plate holes 20a of the first group, and the equivalent diameter of the bridge plate holes 20a of the third group is 0.75 of the equivalent diameter of the bridge plate holes 20a of the second group. This makes it convenient for personnel to manufacture the bridge plate holes 20a one by one according to the fixed ratio, thereby improving manufacturing efficiency.

[0073] It can be understood that the arrangement of the bridge plate 20 and the substrate 10 should be convenient for manufacturing and for the bridge plate 20 to cut the heat exchange airflow.

[0074] In some embodiments, see Figure 1 and Figure 4 In the projection of the plane where the substrate 10 is located, the bridge pieces 20 of the heat exchanger fin are arranged along the same straight line. The bridge pieces 20 are arranged along a straight line, which is convenient for manufacturing.

[0075] It is understandable that each bridge fin 20 can be arranged along the same straight line along the flow direction of the heat exchange airflow. When the heat exchange airflow passes through each bridge fin 20, the heat exchange airflow flows in a straight line direction, so that the heat exchange airflow can achieve heat exchange with the heat exchanger fins while reducing the kinetic energy loss caused by the turning of the heat exchange airflow, so that the heat exchange airflow has less speed loss after flowing through the heat exchanger fins, reducing the obstruction to the subsequent heat exchange airflow, and improving the heat exchange efficiency.

[0076] It is understandable that the bridge pieces 20 can be arranged along the same straight line perpendicular to the flow direction of the heat exchange airflow, so that the heat exchange airflow contacts the bridge pieces 20 as much as possible in the cross section of the flow direction, thereby improving the heat exchange effect.

[0077] It is understandable that the heat exchanger fins need to cooperate with the heat exchange tubes 30 in the heat exchanger to achieve the heat exchange function. Therefore, corresponding structures need to be provided on the heat exchanger fins to facilitate heat conduction with the heat exchange tubes 30 .

[0078] In some embodiments, see Figure 4 The substrate 10 is provided with a plurality of mounting holes 10a for the heat exchange tubes 30 to pass through, and the mounting holes 10a penetrate the substrate 10 along the thickness direction of the substrate 10. The mounting holes 10a provide mounting positions for achieving heat conduction between the substrate 10 and the heat exchange tubes 30. The mounting holes 10a penetrate along the thickness direction to reduce the number of heat exchange tubes 30 passing through the substrate 10.

[0079] In some embodiments, the mounting hole 10a may be manufactured by a punching process to simplify the manufacturing process of the mounting hole 10a, improve production efficiency, and reduce production costs.

[0080] In some embodiments, see Figure 4 At least one bridge sheet 20 is disposed between two adjacent mounting holes 10a, so that the heat exchange airflow can pass through the bridge sheet 20 to obtain a better heat exchange effect when flowing between two adjacent mounting holes 10a.

[0081] It is understandable that the material of the heat exchange tube 30 should be a material with good thermal conductivity and easy to manufacture, such as galvanized sheet.

[0082] It is understandable that the contact between the heat exchange tube 30 and the substrate 10 can be achieved by a detachable connection, such as a screw connection, a snap connection, etc., to facilitate daily maintenance and repair.

[0083] The contact between the heat exchange tube 30 and the substrate 10 can also be achieved by bonding to simplify the installation steps. The adhesive should be one with good thermal conductivity.

[0084] In some embodiments, see Figure 7 The bridge pieces 20 of two adjacent heat exchanger fins are aligned in a plate-to-plate manner, that is, the extension directions of the two bridge pieces 20 are parallel and the two bridge pieces 20 are aligned on both sides of the heat exchange airflow flow direction. In addition, the convex directions of the mutually aligned bridge pieces 20 are the same. This prevents the adjacent heat exchanger fins from contacting each other and blocking the flow of the heat exchange airflow in the airflow channel 40, facilitates the heat conduction between the heat exchange airflow and the heat exchanger fins, and improves the heat exchange effect.

[0085] The spacing distances between the multiple heat exchanger fins are equal, so that the heat exchange airflow flows evenly between the heat exchanger fins, thereby improving the utilization efficiency of the heat exchanger fins.

[0086] It is understandable that the specific structural form of the heat exchange tube 30 should be conducive to heat conduction between the heat exchange tube 30 and the heat exchanger fins.

[0087] In some embodiments, see Figure 6 The heat exchange tube 30 includes a heat conducting plate 31, and each heat exchanger fin contacts the surface of the heat conducting plate 31. The heat conducting plate 31 expands the area of ​​the heat exchange tube 30 in contact with the outside world, so that more heat exchanger fins can be arranged in contact with the heat exchange tube 30, thereby improving the heat exchange effect. At the same time, the heat exchanger fins are also conveniently arranged on the straight guide plate, which is convenient for installation and subsequent inspection and maintenance.

[0088] It is understandable that a plurality of heat-conducting flat plates 31 may be arranged to form a heat exchange tube 30 with a rectangular cross-section.

[0089] It is understandable that the heat exchanger fins should be easy to manufacture to improve production efficiency and reduce material loss during the production process.

[0090] In some embodiments, see Figure 6 and Figure 7 Each heat exchanger fin is constructed by continuously bending a metal plate back and forth. While manufacturing the heat exchanger fin, it saves materials and reduces the loss of materials in the production process. At the same time, multiple heat exchanger fins are stacked to form an airflow channel 40.

[0091] It can be understood that the cross-section of the heat exchanger fin formed by continuous reciprocating bending along the flow direction of the heat exchange airflow is "U"-shaped or "V"-shaped.

[0092] Among them, bending into a “U” shape can reduce the stress concentration at the bending position of the heat exchanger fin during the bending process, and at the same time, it is also convenient for the bent portion to be in thermal contact with the outer surface of the heat exchange tube 30 .

[0093] In some embodiments, the heat exchanger fins are made of a single metal plate, and a plurality of heat exchanger fins are stacked along the thickness direction of the metal plate, thereby simplifying the production process of the heat exchanger fins and reducing the production cost.

[0094] It can be understood that, in the heat exchanger, the heat exchange tube 30 can be arranged between the stacked heat exchanger fins, or can pass through the heat exchanger fins to be in heat-conducting contact with the heat exchanger fins.

[0095] In some embodiments, see Figure 4 , Figure 7 and Figure 8The substrate 10 is provided with a mounting hole 10a that penetrates the substrate 10 along the thickness direction of the substrate 10, and the heat exchange tube 30 is inserted into the mounting hole 10a of each substrate 10. Each heat exchange tube 30 passes through multiple substrates 10 along the extension direction, thereby improving the heat exchange effect of the fluid in each heat exchange tube 30. Multiple heat exchange tubes 30 can pass through each substrate 10, thereby improving the utilization rate of the heat exchange capacity of each heat exchanger fin.

[0096] It is understandable that when the heat exchange air flow flows between the substrates 10, it can collide with the heat exchange tubes 30 passing through the substrates 10, so that the heat exchange air flow turns along the surface of the heat exchange tubes 30 and generates vortices, which is beneficial to destroy the boundary layer of the heat exchange air flow and improve the heat exchange effect.

[0097] In some embodiments, the heat exchanger fins are processed as follows:

[0098] First, a metal plate is used as a substrate 10, and a plurality of bridge holes 20a are punched out on the metal plate; then, according to the pre-design, the peripheral area of ​​one or more bridge holes 20a is divided; and then two adjacent divided areas are punched out through two molds with opposite punching directions, so that the two divided areas protrude from the substrate 10, thereby forming a bridge 20.

[0099] In some embodiments, during the processing, after the bridge plate holes 20 a are punched out, the mounting holes 10 a for the heat exchange tubes 30 to pass through may be cut or punched out.

[0100] In some embodiments, during the manufacturing process, after the bridge piece 20 is formed, the metal sheet is continuously reciprocated and bent.

[0101] The heat exchange performance of the heat exchanger in one embodiment of the present invention is compared with that of a heat exchanger in the related art having the same size specifications but without the bridge plate holes 20a. Fig. 9 , the ordinate is PEC (Performance Evaluation Criterion, comprehensive heat exchange performance evaluation factor), PEC = (Nu 有 / Nu 无 ) / (f 有 / f 无 ), where Nu 有 is the Nusselt number of the heat exchanger with bridge holes 20a, Nu 无 is the Nusselt number of the heat exchanger without the bridge hole 20a, f 有 is the friction coefficient of the heat exchanger with bridge plate holes 20a, f 无is the friction coefficient of the heat exchanger without the bridge plate holes 20a; the horizontal axis is Re (Reynolds number). In the range of Re of 400 to 1600, compared with the heat exchanger without the bridge plate holes 20a, the heat exchange effect of an embodiment of the present invention is improved by at least 1.5%.

[0102] The embodiment of the present invention further provides a heat pump system, including a compressor, a condenser and an evaporator, wherein the condenser and / or the evaporator adopts any heat exchanger in the above-mentioned embodiment. The compressor can make the fluid heat exchange medium flow, and the fluid heat exchange medium continuously passes through the heat exchanger in the condenser and / or the evaporator, thereby realizing the circulation heat exchange of the fluid heat exchange medium.

[0103] The embodiment of the present invention further provides an electrical device, which includes the heat pump system in the above embodiment. The electrical device can be a heat pump clothes dryer, an air conditioner, a refrigerator, and other equipment.

[0104] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0105] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heat exchanger fin, characterized in that: The heat exchanger fin comprises: A substrate (10); A plurality of bridge pieces (20) arranged on the substrate (10) and used for cutting the heat exchange airflow, the bridge piece (20) being provided with bridge piece holes (20a) penetrating the bridge piece (20) along the thickness direction, and along the flow direction of the heat exchange airflow, the equivalent diameter of the upstream bridge piece hole (20a) is greater than the equivalent diameter of the downstream bridge piece hole (20a); Wherein, along the flow direction of the heat exchange airflow, two adjacent bridge sheets (20) are protrudingly arranged on opposite sides of the base sheet (10).

2. The heat exchanger fin according to claim 1, characterized in that: The plurality of bridge sheets (20) are formed by punching out the base sheet (10).

3. The heat exchanger fin according to claim 1, characterized in that: The equivalent diameter of the bridge plate hole (20a) does not exceed one half of the size of the bridge plate (20) along the flow direction of the heat exchange airflow.

4. The heat exchanger fin according to claim 1, characterized in that: All the bridge plates (20) of the heat exchanger fins are divided into a plurality of bridge plate groups, the equivalent diameters of the bridge plate holes (20a) in each bridge plate group are the same, and the bridge plate groups are arranged in sequence along the flow direction of the heat exchange airflow. In two adjacent bridge plate groups, the equivalent diameter of the bridge plate holes (20a) in the downstream bridge plate group is 0.7 to 0.8 of the equivalent diameter of the bridge plate holes (20a) in the upstream bridge plate group.

5. The heat exchanger fin according to any one of claims 1 to 4, characterized in that: In the projection of the plane where the substrate (10) is located, the bridge pieces (20) of the heat exchanger fins are arranged along the same straight line.

6. The heat exchanger fin according to any one of claims 1 to 4, characterized in that: The substrate (10) is provided with a plurality of mounting holes (10a) for allowing the heat exchange tubes (30) to pass through, and the mounting holes (10a) penetrate the substrate (10) along the thickness direction of the substrate (10).

7. The heat exchanger fin according to claim 6, characterized in that: At least one bridge piece (20) is arranged between two adjacent mounting holes (10a).

8. A heat exchanger, characterized in that: The heat exchanger comprises a heat exchange tube (30) and a plurality of heat exchanger fins according to any one of claims 1 to 4, wherein the heat exchange tube (30) is in thermal contact with the substrate (10); the plurality of heat exchanger fins are stacked, and an air flow channel (40) is formed between the substrates (10) of two adjacent heat exchanger fins, and at least a portion of the bridge piece (20) extends into the air flow channel (40).

9. The heat exchanger according to claim 8, characterized in that The heat exchange tube (30) comprises a heat conducting plate (31), and each of the heat exchanger fins is in contact with a surface of the heat conducting plate (31).

10. The heat exchanger according to claim 9, characterized in that Each of the heat exchanger fins is structured as follows: it is formed by continuously reciprocatingly bending a metal plate.

11. The heat exchanger according to claim 8, characterized in that The substrate (10) is provided with a mounting hole (10a) penetrating the substrate (10) along the thickness direction of the substrate (10), and the heat exchange tube (30) is inserted into the mounting hole (10a) of each substrate (10).

12. A heat pump system, characterized in that: The invention comprises a compressor, a condenser and an evaporator, wherein the condenser and / or the evaporator adopts the heat exchanger according to any one of claims 8 to 11.

13. An electrical device, characterized in that: A heat pump system comprising the heat pump system of claim 12.

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