Heat exchange plate, heat exchange core and printed circuit board type heat exchanger

Abstract

The utility model belongs to the technical field of flow heat transfer, and discloses a heat exchange plate, a heat exchange core and a printed circuit board type heat exchanger. In the flowing direction of a heat exchange working medium, the plate sheet body is sequentially provided with an inlet flow dividing area, a main heat exchange area and an outlet flow converging area. A plurality of shunting elements are arranged in the inlet shunting area and the outlet converging area; wherein the plurality of shunting elements are distributed in a dot matrix shape, and the cross section of each shunting element is of a rhombus structure; a plurality of micro-channels are arranged in the main heat exchange area; according to the heat exchanger, uniform distribution and confluence of working media are ensured through the distribution elements distributed in a dot matrix shape, uniform distribution of temperature in the heat exchanger is ensured, and the long-term running service life of the heat exchanger is further effectively ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of heat transfer technology, especially relates to a heat exchange plate piece, heat exchange core body and printed circuit board type heat exchanger. BACKGROUND

[0002] Printed Circuit Heat Exchanger (PCHE) is a kind of heat exchanger that is processed by chemical etching / mechanical processing etc. on metal plate piece to form multiple micro-channel hole structure, and is welded to form by diffusion welding technology, it has the advantages of high temperature and high pressure resistance, high strength, large heat exchange capacity per unit volume, and is widely used in SCO2 power system, supercritical helium power generation system, fine chemical industry, centralized photothermal power generation, fourth generation nuclear power etc.

[0003] At present, the heat exchange medium in the existing printed circuit board type heat exchanger is prone to uneven flow distribution when entering or flowing out of the micro-channel hole structure, which seriously affects the heat transfer performance of the heat exchanger, secondly, uneven distribution of medium flow is prone to cause uneven temperature distribution in the heat exchanger, produce additional temperature difference stress and influence, greatly reduce the service life of the heat exchanger long-term operation. UTILITY MODEL CONTENTS

[0004] In view of the technical problems existing in the prior art, the utility model provides a heat exchange plate piece, heat exchange core body and printed circuit board type heat exchanger, the heat exchange medium in the existing printed circuit board type heat exchanger is prone to uneven flow distribution when entering or flowing out of the micro-channel hole structure, which seriously affects the heat transfer performance of the heat exchanger.

[0005] To achieve the above purpose, the utility model adopts the technical scheme that:

[0006] The utility model provides a heat exchange plate piece, which comprises a plate body, an inlet shunt area, a main heat exchange area and an outlet shunt area are sequentially arranged on the plate body along the flow direction of the heat exchange medium.

[0007] A plurality of shunt elements are arranged in the inlet shunt area and the outlet shunt area, wherein the shunt elements are distributed in a dot matrix manner, and the cross section of each shunt element is in a diamond structure.

[0008] A plurality of micro-channels are arranged in the main heat exchange area.

[0009] Further, the long axis direction of the cross section of the shunt element is adapted to the flow direction of the heat exchange medium, and the flow angle of the shunt element is 30-45 degrees.

[0010] Further, the plate body is further provided with an inlet pipe box area; the inlet pipe box area is located at the inlet end of the inlet shunt area, and the inlet pipe box area has a horn structure; wherein the larger end of the horn cross section of the inlet pipe box area is communicated with the inlet end of the inlet shunt area.

[0011] Further, the plate body is further provided with an outlet pipe box area; the outlet pipe box area is located at the outlet end of the outlet shunt area, and the outlet pipe box area has a horn structure; wherein the larger end of the horn cross section of the outlet pipe box area is communicated with the outlet end of the outlet shunt area.

[0012] Further, the side wall of the inlet pipe box area and the outlet pipe box area is a symmetrical 1 / 4 circular arc structure; wherein the center of the 1 / 4 circular arc structure is away from the center of the inlet shunt area or the outlet pipe box area.

[0013] Further, the side wall of the inlet pipe box area and the outlet pipe box area is a symmetrical 1 / 4 circular arc structure; wherein the center of the 1 / 4 circular arc structure is away from the center of the inlet shunt area or the outlet pipe box area.

[0014] Further, the side wall of the inlet pipe box area and the outlet pipe box area is a symmetrical 1 / 4 circular arc structure; wherein the center of the 1 / 4 circular arc structure is away from the center of the inlet shunt area or the outlet pipe box area.

[0015] Further, the plurality of micro flow channels are straight flow channels, Z-shaped flow channels or wing-shaped flow channels.

[0016] The utility model further provides a kind of heat exchange core, including several heat exchange plates, several heat exchange plates are alternately stacked;Wherein, the heat exchange plate uses the heat exchange plate of the described.

[0017] The utility model further provides a kind of printed circuit board type heat exchanger, including the heat exchange core of the described.

[0018] Compared with prior art, the utility model has the beneficial effects that:

[0019] The heat exchange plate provided by the utility model is provided with a plurality of lattice distribution shunt elements in the inlet shunt area and the outlet confluence area, and the cross section of each shunt element is designed as a rhombic structure; in the inlet shunt area, the shunt effect of the lattice distribution shunt elements can effectively distribute the working medium at the inlet into each micro channel, reduce the unevenness of fluid distribution, and avoid the occurrence of local overheating or overcooling; meanwhile, in the outlet confluence area, the lattice distribution shunt elements also help to uniformly collect the fluid in each micro channel, and improve the overall heat transfer efficiency; wherein, the rhombic cross section shunt element has a good guiding effect to guide the fluid to flow along the preset path, and further enhances the uniformity of fluid distribution; the lattice distribution shunt element ensures the uniform shunt and confluence of the working medium, ensures the uniform distribution of temperature in the heat exchanger, and further effectively guarantees the service life of the heat exchanger during long-term operation.

[0020] Further, the cross section long axis direction of the shunt element is designed to be adapted to the flow direction of the heat exchange medium, which can guide the fluid to flow along the preset path to enhance the uniformity of fluid distribution; meanwhile, the flow angle of the shunt element is designed as 30°-45°, which can effectively reduce the resistance of the fluid during flow, and improve the shunt effect of the shunt element.

[0021] Further, the inlet pipe box area is arranged at the inlet section of the inlet shunt area, and the inlet pipe box area is designed as a horn-shaped structure, so that the fluid can gradually slow down and be uniformly distributed before entering the inlet shunt area, which helps to reduce fluid impact and turbulence, and makes the fluid more smoothly enter the inlet shunt area.

[0022] Further, the outlet pipe box area is arranged at the outlet section of the outlet confluence area, and the horn-shaped structure of the outlet pipe box area helps the fluid to smoothly flow out of the outlet confluence area, which can reduce the disturbance of the fluid during confluence, and make the fluid more uniformly flow out of the heat exchange plate.

[0023] Further, the side wall channel is arranged at the side wall close to the inlet pipe box area and at the side wall close to the outlet pipe box area, and the side wall channel provides a working medium flow space to guide the fluid to turn and reduce the resistance of the fluid flowing to the farthest channel. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 Structure diagram of the heat exchange plate provided for Example 1;

[0026] Figure 2 Structure diagram of the inlet area of the heat exchange plate in Example 1;

[0027] Figure 3 Structure diagram of the outlet area of the heat exchange plate in Example 1;

[0028] Figure 4 Structure diagram of the printed circuit board type heat exchanger provided for Example 3.

[0029] Wherein, 100 plate body; 1 inlet header area, 2 inlet shunt area, 3 main heat exchange area, 4 outlet manifold area, 5 outlet header area; 6 shunt element, 7 side wall passage; 8 cold side head, 9 cold side pipe, 10 hot side head, 11 hot side pipe. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved in the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Example 1

[0032] As shown in the accompanying Figure 1 The present embodiment 1 provides a heat exchange plate, which comprises a plate body 100; along the flow direction of the heat exchange medium, the plate body 100 is sequentially provided with an inlet header area 1, an inlet shunt area 2, a main heat exchange area 3, an outlet manifold area 4 and an outlet header area 5.

[0033] The main heat exchange area 3 is located in the middle of the surface of the plate body 100, the inlet shunt area 2 is arranged at the inlet end of the main heat exchange area 3, and the outlet manifold area 4 is arranged at the outlet end of the main heat exchange area 3; the inlet header area 1 is arranged at the inlet end of the inlet shunt area 2, and the outlet header area 5 is arranged at the outlet end of the outlet manifold area 4.

[0034] Specifically, the outlet of the inlet header area 1 communicates with the inlet of the inlet shunt area 2, the outlet of the inlet shunt area 2 communicates with the inlet of the main heat exchange area 3; the outlet of the main heat exchange area 3 communicates with the inlet of the outlet manifold area 4, and the outlet of the outlet manifold area 4 communicates with the inlet of the outlet header area 5.

[0035] In this embodiment 1, the inlet pipe box area 1 and the outlet pipe box area 5 are both in a horn structure; wherein the larger end of the horn cross section size of the inlet pipe box area 1 is communicated with the inlet end of the inlet shunt area 2, and the larger end of the horn cross section size of the outlet pipe box area 5 is communicated with the outlet end of the outlet confluence area 4; preferably, the side wall of the inlet pipe box area 1 and the outlet pipe box area is a symmetrical 1 / 4 circular arc structure; wherein the center of the 1 / 4 circular arc structure is away from the center of the inlet shunt area 2 or the outlet pipe box area 5.

[0036] It should be noted that the specific process of setting the side wall of the inlet pipe box area 1 and the outlet pipe box area 5 as a symmetrical 1 / 4 circular arc structure is that: at the inlet shunt area 2 and the outlet pipe box area 5, the two sides of the plate body 100 are inwardly recessed to the middle part of the plate body 100 to form a 1 / 4 circular arc.

[0037] It should be further noted that the diameter and length size of the inlet pipe box area 1 and the outlet pipe box area 5 are determined according to the thermal physical condition of the heat exchange medium; that is, the diameter and length size of the inlet pipe box area 1 and the outlet pipe box area 5 are used to adjust the flow velocity of the medium at the inlet and outlet of the inlet pipe box area 1 and the outlet pipe box area 5, so as to realize the effect of uniform fluid medium; wherein the diameter and length size of the inlet pipe box area 1 and the outlet pipe box area 5 make the outlet and inlet medium flow velocity of the inlet pipe box area 1 and the outlet pipe box area 5 meet the following conditions:

[0038]

[0039] wherein, is the inlet medium flow velocity of the inlet pipe box area 1 or the outlet pipe box area 5; is the outlet medium flow velocity of the inlet pipe box area 1 or the outlet pipe box area 5; is the fluid density at the inlet of the inlet pipe box area 1 or the outlet pipe box area 5; is the inlet cross-sectional area of the inlet pipe box area 1 or the outlet pipe box area 5; is the fluid density at the outlet of the inlet pipe box area 1 or the outlet pipe box area 5; is the outlet cross-sectional area of the inlet pipe box area 1 or the outlet pipe box area 5.

[0040] In the embodiment 1, a plurality of shunt elements 6 are arranged in the inlet shunt area 2 and the outlet confluence area 4, and the plurality of shunt elements 6 are distributed in a lattice form; wherein, in the inlet shunt area 2 or the outlet confluence area 4, the shunt elements 6 are arranged in a form of more in the middle and less on both sides; that is, the number of shunt elements near the middle of the inlet shunt area 2 or the outlet confluence area 4 is more than the number of shunt elements near the side walls of the inlet shunt area 2 or the outlet confluence area 4.

[0041] The long axis direction of the cross section of the shunt element 6 is adapted to the flow direction of the heat exchange working medium; preferably, the cross section of each shunt element 6 is a rhombic structure, and the flow angle of the shunt element 6 is 30°-45°; specifically, the shunt element 6 is formed by chemical etching at the inlet shunt area 2 or the outlet confluence area 4; in terms of structure, one end of the shunt element 6 is connected to the surface of the plate body 100, and the other end of the shunt element 6 extends away from the surface of the plate body 100; wherein, the cross section of the shunt element 6 parallel to the surface of the plate body 100 is designed as a rhombic structure, the long axis direction of the rhombic structure is adapted to the flow direction of the heat exchange working medium, and the included angle of the flow end of the rhombic structure is 30°-45°.

[0042] In the embodiment 1, a side wall channel 7 is arranged near the side wall of the inlet pipe box area 1 and near the side wall of the outlet pipe box area 5; wherein, the side wall channel 7 is a channel structure near the side wall of the inlet pipe box area 1 or the side wall of the outlet pipe box area 5; by arranging the side wall channel 7 near the side wall of the inlet pipe box area 1 and near the side wall of the outlet pipe box area 5, the side wall channel 7 is used as a reserved fluid flow channel to guide the fluid to turn and reduce the resistance of the fluid flowing to the farthest channel.

[0043] In the embodiment 1, a plurality of micro flow channels are arranged in the main heat exchange area 3, and the plurality of micro flow channels are straight channels, Z-shaped channels or wing-shaped channels; by arranging the plurality of micro flow channels in the main heat exchange area 3, the heat exchange area can be greatly increased, so that the fluid can exchange heat with the plate more fully during the flow process; in addition, the design of the micro flow channel can also promote the turbulent flow of the fluid, enhance the disturbance of the fluid, and further improve the heat transfer efficiency.

[0044] Working principle:

[0045] The heat exchange plate of the embodiment 1, when working, the heat exchange medium flows into the inlet pipe box area 1 into the inlet shunt area 2; in the inlet shunt area 2, the shunt element arranged therein is used to uniformly shunt the flowing heat exchange medium, so that the uniformly dispersed heat exchange medium flows into the micro-channel of the main heat exchange area 3, and the heat exchange medium exchanges heat in the main heat exchange area 3; the heat exchanged fluid is gathered in the outlet converging area 4 and then flows out from the outlet pipe box area 5.

[0046] The heat exchange plate of the embodiment 1, by chemical etching, a plurality of shunt elements 6 are formed in the inlet shunt area 2 and the outlet converging area 4, which can effectively shunt and converge the heat exchange medium, realize uniform distribution of the heat exchange medium, increase the comprehensive flow heat transfer performance of the heat exchanger, and ensure good structural strength; at the same time, the side wall passage 7 is arranged at the side wall close to the inlet pipe box area 1 and the side wall close to the outlet pipe box area 5 for fluid flow, so as to guide the fluid to turn and realize reducing the resistance of the fluid flowing to the farthest channel; wherein the main heat exchange area and the inlet and outlet areas of the plate can be simultaneously manufactured by chemical etching, which does not increase additional cost in process, and has good strength characteristics.

[0047] Embodiment 2

[0048] The embodiment 2 provides a heat exchange core body, which comprises a plurality of heat exchange plates; the plurality of heat exchange plates are alternately stacked; wherein the heat exchange plate adopts the heat exchange plate of the above-mentioned embodiment 1, and the heat exchange plates are fixed by diffusion welding process; it should be noted that the inlet pipe box area and the outlet pipe box area on the adjacent heat exchange plates are staggered with each other.

[0049] Embodiment 3

[0050] As shown in the accompanying Figure 4 , the embodiment 3 provides a printed circuit board type heat exchanger, which comprises a heat exchange core body, a cold side head 8, a cold side pipe 9, a hot side head 10 and a hot side pipe 11; the heat exchange core body adopts the heat exchange core body of the above-mentioned embodiment 2, and the heat exchange core body comprises an inlet and outlet of a cold side fluid passage and an inlet and outlet of a hot side fluid passage, the inlet and outlet of the cold side fluid passage are connected with the cold side head 8 and the cold side pipe 9, and the inlet and outlet of the hot side fluid passage are connected with the hot side head 11 and the hot side pipe 11; it should be noted that the shaded area in the accompanying Figure 4 is the heat exchange plate described in the above-mentioned embodiment 1.

[0051] It also needs to be explained that the heat exchange core described in the above embodiment 2 and the printed circuit board type heat exchanger described in the above embodiment 3 are basically the same as the structure of the existing heat exchange core and the printed circuit board type heat exchanger, the difference is that the heat exchange plate in the existing heat exchange core is replaced by the heat exchange plate in the above embodiment 1, the rest of the structure is basically the same, here will not be repeated.

[0052] The heat exchange plate improves the structure of the inlet and outlet area under the premise of ensuring the strength, improves the uniformity of fluid distribution in a wide operating range, can effectively ensure the heat transfer performance of the heat exchanger, ensures the prediction accuracy of flow heat transfer and resistance; at the same time, the uniform distribution of heat exchange medium can ensure that the temperature distribution in the heat exchanger is uniform, thereby improving the service life of the long-term operation of the heat exchanger.

[0053] In the utility model, the several shunt elements arranged in the inlet shunt area and the outlet confluence area are distributed in a dot matrix manner, the cross section of each shunt element is a rhombic structure, can effectively distribute the working medium at the inlet to each micro flow channel, reduce the unevenness of fluid distribution, avoid the occurrence of local overheating or supercooling; at the same time, in the outlet confluence area, the dot matrix shunt element also helps to uniformly collect the fluid in each micro flow channel, improves the overall heat transfer efficiency; it needs to be explained that the design of the heat exchange plate has high flexibility, can be customized according to different heat exchange requirements;for example, by adjusting the number, shape and size of the shunt element, the number and layout of the micro flow channel and the diameter and length size of the inlet pipe box area and the outlet pipe box area, the adaptation to different fluids and operating conditions can be realized, has the advantages of improving heat transfer efficiency, enhancing the uniformity of fluid distribution, reducing fluid resistance, improving the reliability and durability of the equipment and strong adaptability.

[0054] The above embodiment is only one of the implementation manners of the utility model technical scheme, the scope of protection of the utility model is not limited by the embodiment, also includes the changes, replacements and other implementation manners easily thought of by any skilled person in the art within the technical range disclosed by the utility model.

Claims

1. A heat exchange plate, characterized in that, It includes a plate body (100); along the flow direction of the heat exchange medium, the plate body (100) is provided with an inlet diversion area (2), a main heat exchange area (3) and an outlet confluence area (4) in sequence. A plurality of diversion elements (6) are provided in the inlet diversion area (2) and the outlet confluence area (4); wherein, the plurality of diversion elements (6) are distributed in a dot matrix pattern, and the cross section of each diversion element (6) is a rhombic structure; Several microchannels are provided in the main heat exchange area (3).

2. A heat exchange plate according to claim 1, characterized in that, The long axis of the cross section of the flow splitting element (6) is adapted to the flow direction of the heat exchange medium; the flow angle of the flow splitting element (6) is 30°-45°.

3. A heat exchange plate according to claim 1, characterized in that, The plate body (100) is also provided with an inlet pipe box area (1); the inlet pipe box area (1) is located at the inlet end of the inlet diversion area (2), and the inlet pipe box area (1) has a trumpet-shaped structure; wherein, the end of the inlet pipe box area (1) with a larger trumpet-shaped cross-sectional size is connected to the inlet end of the inlet diversion area (2).

4. A heat exchange plate according to claim 3, characterized in that, The plate body (100) is also provided with an outlet pipe box area (5); the outlet pipe box area (5) is located at the outlet end of the outlet confluence area (4), and the outlet pipe box area (5) has a trumpet-shaped structure; wherein, the end of the outlet pipe box area (5) with a larger trumpet-shaped cross-sectional size is connected to the outlet end of the outlet confluence area (4).

5. A heat exchange plate according to claim 4, characterized in that, The sidewalls of the inlet pipe box area (1) and the outlet pipe box area are both symmetrical 1 / 4 arc-shaped structures; wherein the center of the 1 / 4 arc-shaped structure is located away from the center of the inlet diversion area (2) or the outlet pipe box area (5).

6. A heat exchange plate according to claim 4, characterized in that, A side wall channel (7) is provided in the inlet pipe box area (1) and near the side wall of the inlet pipe box area (1).

7. A heat exchange plate according to claim 6, characterized in that, A side wall channel (7) is provided in the outlet pipe box area (5) and near the side wall of the outlet pipe box area (5).

8. A heat exchange plate according to claim 1, characterized in that, Several microchannels are direct-flow channels, Z-shaped channels, or airfoil channels.

9. A heat exchange core, characterized in that, It includes a plurality of heat exchange plates, which are stacked alternately; wherein the heat exchange plates are heat exchange plates as described in any one of claims 1-8.

10. A printed circuit board heat exchanger, characterized in that, Includes the heat exchange core as described in claim 9.

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