Printed circuit board type heat exchanger with vortex-shaped flow channel structure

Abstract

The invention discloses a printed circuit board heat exchanger with a vortex-shaped flow channel structure, and relates to the technical field of heat exchange, the printed circuit board heat exchanger comprises a heat exchange shell and a tube core, the heat exchange shell comprises a first inlet tube shell, a second inlet tube shell, a first inlet flow tube, a second inlet flow tube, a first outlet flow tube and a second outlet flow tube, the first inlet tube shell is connected with the second inlet flow tube, and the second inlet tube shell is connected with the second outlet flow tube. The second inlet pipe shell is connected with the first inlet flow pipe, the pipe core is formed by vertically and alternately welding a plate a and a plate b, and the two plates are each provided with two vortex-shaped flow channels, two quarter-arc-shaped liquid bins and a hole communicating the upper plate with the lower plate. According to the printed circuit board type heat exchanger with the vortex-shaped flow channel structure, under the same heat exchanger core body size, the heat exchange length of each group of cold and hot flow channels is far larger than that of a traditional rectangular printed circuit board type heat exchanger, transverse and longitudinal heat exchange can be carried out at the same time, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, in particular to a printed circuit board type heat exchanger with a vortex flow channel structure. Background Art

[0002] Due to the increasing demand for high-efficiency heat exchangers in the engineering field in recent years, microchannel heat dissipation has become one of the main heat dissipation methods currently being studied due to its many advantages compared with traditional heat dissipation methods. Printed Circuit Heat Exchanger (PCHE), as a type of microchannel heat exchanger, can meet the requirements of high temperature, high pressure, compact structure, and high efficiency in the heat exchange process. It has been used in many industrial fields such as high-temperature reactor intercoolers, Brayton cycle supercritical carbon dioxide heat exchangers, chemical processing, electric power, refrigeration, etc.

[0003] Most of the current printed circuit board heat exchangers are arranged in a stacked rectangular plate format. When the fluid mass flow rate is constant and the fluid heat exchange effect needs to be enhanced, it is often necessary to arrange multiple heat exchangers in series, thereby increasing the space occupied by the entire heat exchanger. In a limited space, it is difficult to effectively increase the heat exchange length of the two fluids.

[0004] At the same time, the internal fluid heat exchange of the current printed circuit board heat exchanger is often only in the vertical direction, and only one fluid (cold fluid or hot fluid) can flow through a single-layer plate, so that heat exchange in the parallel direction cannot be achieved, and the effect of three-dimensional heat exchange cannot be achieved. Summary of the invention

[0005] The present invention provides a printed circuit board type heat exchanger with a vortex flow channel structure, which solves the problem that the heat exchange length of a commonly used printed circuit board type heat exchanger is difficult to increase within a limited space and the heat exchange effect is not ideal.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a printed circuit board type heat exchanger with a vortex flow channel structure, comprising a heat exchange shell and a tube core, the heat exchange shell comprising an inlet tube shell 1, an inlet tube shell 2, an inlet flow tube 1, an inlet flow tube 2, an outlet flow tube 1 and an outlet flow tube 2, the inlet tube shell 1 is connected to the inlet flow tube 2, the inlet tube shell 2 is connected to the inlet flow tube 1, the tube core is formed by alternately welding the a plate and the b plate up and down, and both of them are circular in shape, and both plates are provided with two vortex flow channels, two quarter-circular liquid tanks and holes connecting the upper and lower plates.

[0007] Preferably, a protruding plate is provided on one side of the tube core for setting the inlet flow tube and cooperating with the installation of the inlet tube shell. The shape of the inlet flow tube interface can be circular, semicircular, rectangular, elliptical, etc., which can be selected according to needs to facilitate the implementation of the flow channel etching operation.

[0008] Preferably, the a plate is provided with a first flow channel and a second flow channel, the first flow channel is used to transport the first working fluid, and the second flow channel is used to transport the second working fluid, the outlet of the first flow channel is connected to the outlet flow pipe 1 that opens through the a plate, and the outlet of the second flow channel is connected to the outlet flow pipe 2 that opens through the a plate.

[0009] Preferably, a third flow channel and a fourth flow channel are provided on the b plate, which are arranged directly below the first flow channel and the second flow channel respectively. The second working fluid is transported through the third flow channel, and the first working fluid is transported through the fourth flow channel. The outlet of the third flow channel is connected to the outlet flow pipe 2 that opens through the b plate, and the outlet of the fourth flow channel is connected to the outlet flow pipe 1 that opens through the b plate.

[0010] Preferably, the inlet flow tube 2 is divided into two flow tubes at the inlet and enters the inlet tube shell 1 on both sides, and then is connected to multiple first flow channels and fourth flow channels, and finally flows out from the outlet flow tube 1; the inlet flow tube 1 is connected to the front end inlet tube shell 2, and then is connected to multiple second flow channels and third flow channels, and finally flows out from the outlet flow tube 2, the projections of the first flow channel and the third flow channel on the horizontal plane are collinear, and the projections of the second flow channel and the fourth flow channel on the horizontal plane are collinear except for the flow channel inlet and outlet areas.

[0011] Preferably, the two flow channels of the a plate and the b plate are both regularly parallel and circling vortex flow channels, the two flow channels are tightly surrounded, the plate utilization rate is high, and the operation is stable and reliable; there are only two vortex flow channels and two outlet flow areas on each plate, the structure is simple, and large-scale production and processing are convenient; the heat exchange length of the two working fluids is greatly extended, and the inlet flow pipes are on the same side, the outlet flow channel is a quarter arc area, and circular holes are opened in the fixed area above and below the area for connection with the upper and lower plates for circulation.

[0012] Preferably, the vortex flow channel of the b plate is extended by half a circle more than the corresponding vortex flow channel of the a plate, so that the fluid working medium inside it at the outlet is the same as the fluid working medium at the outlet of the upper and lower plates. The arc radius of the liquid bin area of ​​the b plate is smaller than that of the liquid bin of the a plate, which is smaller by the length of the distance between the cold and hot flow channels.

[0013] Preferably, the cross-section of the vortex flow channel in the vertical direction includes semicircular, elliptical, and rectangular shapes.

[0014] Preferably, the cold and hot working medium flow channels on a single a plate or b plate alternate with each other, and at the same time, the cold and hot working medium at the same position of the upper and lower plates alternate with each other, so as to achieve a three-dimensional heat exchange effect.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, the flow channels of the heat exchanger are all vortex-shaped, and the velocity direction changes continuously, which increases the fluid disturbance and enhances the heat transfer effect.

[0017] 2. The length of a single flow channel in the present invention is much longer than that of a traditional rectangular printed circuit board heat exchanger of the same volume, which greatly increases the heat exchange effect.

[0018] 3. In the present invention, there are only two flow channels on each plate. When the mass flow rate of the heat exchange fluid is small, the heat exchanger can ensure that the fluid flow rate allocated to each flow channel is not too low, thereby ensuring the high heat exchange efficiency brought by the high flow rate fluid.

[0019] 4. The fluid heat exchange method in the present invention includes horizontal heat exchange and vertical heat exchange, achieving a three-dimensional heat exchange effect.

[0020] 5. In the present invention, the hot and cold flow channels on the heat exchange plate are closely and regularly arranged, and the projections of the flow channels on the upper and lower plates completely overlap, thereby ensuring the overall compactness of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a structural schematic diagram of a printed circuit board type heat exchanger with a vortex flow channel structure according to the present invention;

[0024] Figure 2 It is a line graph of the average Nu simulation value of fluid simulation heat exchange of air under different inlet mass flow rates under the same working conditions of the present invention;

[0025] Figure 3 It is a top view of the plate a and its flow channel of the present invention;

[0026] Figure 4 It is a top view of the b plate and its flow channel of the present invention;

[0027] Figure 5 is a longitudinal cross-sectional view of the heat exchanger core of the present invention;

[0028] Numbers in the figure: 1, heat exchanger; 2, a plate; 201, first flow channel; 202, second flow channel; 203, first outlet liquid tank; 204, second outlet liquid tank; 3, b plate; 301, third flow channel; 302, fourth flow channel; 303, third outlet liquid tank; 304, fourth outlet liquid tank; 4, outlet flow pipe one; 5, outlet flow pipe two; 6, inlet tube shell one; 7, inlet tube shell two; 8, inlet flow pipe one; 9, inlet flow pipe two. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] Example: Figure 1 As shown, a printed circuit board heat exchanger with a vortex flow channel structure includes a heat exchange shell and a tube core, the heat exchange shell includes an inlet tube shell 1 6, an inlet tube shell 2 7, an inlet flow tube 1 8, an inlet flow tube 2 9, an outlet flow tube 1 4 and an outlet flow tube 2 5, the inlet tube shell 1 6 is connected to the inlet flow tube 2 9, the inlet tube shell 2 7 is connected to the inlet flow tube 1 8, the tube core is formed by alternately welding the a plate 2 and the b plate 3 provided, both of which are etched on the same circular plate body to keep two vortex flow channels with the same flow direction from outside to inside, two quarter-circular arc liquid tanks and holes connecting the upper and lower plates, which are only different at the inlet and the center outlet, the two plates are arranged alternately, and the inlet positions of the cold and hot fluids of the a and b plates are opposite;

[0031] The heat exchanger 1 is a cylinder as a whole, with a rectangular block protruding from one end as a fluid inlet section and sealed with three tube shells. The inlet section is provided with two flow tubes for conveying two heat exchange fluids. The center of the cylinder is the outlet area, which is provided with two flow tubes for the outflow of the two heat exchange fluids. The tube core is formed by stacking and welding two heat exchange plates, the upper plate is the a plate 2, and the lower plate is the b plate 3. Both plate bodies are circular plates, and a rectangular inlet area protrudes from one side for the subsequent installation of the inlet tube shell. Two vortex flow channels (201, 202) are etched on the a plate 2, and a quarter-circular outlet liquid storage area (203, 204) is etched at the end of each of the two flow channels; two vortex flow channels (301, 302) are etched on the b plate 3, and a quarter-circular outlet liquid storage area (303, 304) is also etched at the end of each of the two flow channels. Each of the four liquid storage areas is provided with a through hole near the center of the plate, and the shadows of the two through holes in the upper and lower plates completely overlap.

[0032] Fluid 1 enters the heat exchanger 1 from the inlet flow tube 2 9, and is then divided into multiple first flow channels 201 and fourth flow channels 302, and after heat exchange, flows out together from the outlet flow tube 1 4; fluid 2 enters from the inlet flow tube 1 8, and is divided into multiple second flow channels 202 and third flow channels 301, and finally flows out together from the outlet flow tube 2 5.

[0033] The third flow channel 301 and the fourth flow channel 302 are longer than the first flow channel 201 and the second flow channel 202, and the vortex will have an extra semicircular arc length. Therefore, the arc radius of the third outlet liquid tank 303 and the fourth outlet liquid tank 304 is less than the length of the distance between the cold and hot flow channels than the first outlet liquid tank 203 and the second outlet liquid tank 204.

[0034] Except for the flow channel inlet, the flow channel end and the outlet liquid storage area, the flow channel shadows of the upper and lower plates completely overlap, and the two vortex flow channels on each plate are tightly surrounded by each other, thereby improving the compactness of the heat exchanger 1.

[0035] Figure 2 The figure is a line graph of the air heat exchange simulation results of the traditional printed circuit board heat exchanger 1 model. Under several given heat flux density conditions, the mass flow rate of the air at the inlet is changed. It is found that as the mass flow rate increases, the average Nu of the fluid increases, indicating that the heat exchange performance of the fluid is better. Compared with the traditional rectangular printed circuit board heat exchanger 1, the vortex printed circuit board heat exchanger core of the present invention has a longer flow channel length and a smaller number of flow channels under the same volume, so that under the condition of a certain total mass flow rate, the mass flow rate in the unit pipeline is larger and the heat exchange performance is better.

[0036] Figure 3 and Figure 4 They are top views of the a plate 2 and the b plate 3 (the plate size, channel spacing, and channel hydraulic diameter can all be controlled according to actual conditions, and are only example figures here). The first channel 201 on the a plate 2 is used to transport the first working fluid, and the third channel 301 of the b plate 3 that overlaps with it in the vertical direction is used to transport the second working fluid; correspondingly, the second channel 202 on the a plate 2 is used to transport the second working fluid, and the fourth channel 302 on the b plate 3 transports the first working fluid. In this way, the a plates 2 and the b plates 3 are stacked alternately, and the heat exchanger 1 achieves the purpose of simultaneous left-right and top-down heat exchange.

[0037] like Figure 3 and Figure 4 As shown, in order to make the fluids in the liquid storage areas of the outlet flow tube 1 4 and the outlet flow tube 2 5 the same, the flow channel on the b plate 3 is one semicircular arc longer than the corresponding flow channel on the a plate 2. At the same time, the radius of the liquid storage area on the b plate 3 is one flow channel spacing less than the radius of the liquid storage area on the a plate 2.

[0038] from Figure 3 and Figure 4 It can be seen that the flow channels on each plate are vortex-shaped, and the flow direction is constantly changing, which enhances the disturbance of the fluid in the flow channel, increases the fluid turbulence coefficient, and achieves the purpose of enhancing heat exchange.

[0039] In some embodiments, the vertical cross-section of the flat flow channel is any one of circular, elliptical, rectangular, and multiple-shaped; it can be adjusted according to the application environment, which increases more selectivity and improves adaptability.

[0040] Figure 5 It is a longitudinal cross-sectional view of the core of heat exchanger 1, in which the area with red line shadow is fluid 1, and the area without red line shadow is fluid 2. Figure 5 It can be clearly seen that the core of the heat exchanger 1 achieves a three-dimensional heat exchange effect, which can not only exchange heat horizontally but also vertically, and is better than the traditional rectangular printed circuit board type heat exchanger 1. Both fluids will eventually flow into the two outlet liquid storage areas, and finally flow out separately from the outlet flow pipe 1 4 and the outlet flow pipe 2 5.

[0041] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A printed circuit board heat exchanger with a vortex flow channel structure, characterized in that: It includes a heat exchange shell and a tube core; The heat exchange shell comprises an inlet tube shell 1, an inlet tube shell 2, an inlet flow tube 1, an inlet flow tube 2, an outlet flow tube 1 and an outlet flow tube 2, wherein the inlet tube shell 1 is connected to the inlet flow tube 2, and the inlet tube shell 2 is connected to the inlet flow tube 1; The tube core is formed by alternately welding the a plate and the b plate up and down, and both plates are provided with two vortex flow channels, two quarter-circular arc liquid tanks and holes connecting the upper and lower plates.

2. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 1, characterized in that: A protruding plate is provided on one side of the tube core, which is used to set the inlet flow tube and cooperate with the installation of the inlet tube shell.

3. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 1, characterized in that: The a plate is provided with a first flow channel and a second flow channel, the first flow channel is used to transport the first working fluid, and the second flow channel is used to transport the second working fluid, the outlet of the first flow channel is connected to the outlet flow pipe 1 that opens the a plate, and the outlet of the second flow channel is connected to the outlet flow pipe 2 that opens the a plate.

4. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 1, characterized in that: The b plate is provided with a third flow channel and a fourth flow channel, which are arranged directly below the first flow channel and the second flow channel respectively. The second working fluid is transported through the third flow channel, and the first working fluid is transported through the fourth flow channel. The outlet of the third flow channel is connected to the outlet flow pipe 2 that opens through the b plate, and the outlet of the fourth flow channel is connected to the outlet flow pipe 1 that opens through the b plate.

5. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 4, characterized in that: The inlet flow tube 2 is divided into two flow tubes at the inlet, enters the inlet tube shell 1 on both sides, and then is connected to multiple first flow channels and fourth flow channels, and finally flows out from the outlet flow tube 1; the inlet flow tube 1 is connected to the front inlet tube shell 2, and then connects to multiple second flow channels and third flow channels, and finally flows out from the outlet flow tube 2.

6. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 5, characterized in that: The two flow channels of the a plate and the b plate are both regularly parallel and circling vortex flow channels, and the inlet flow pipes are on the same side. The outlet flow channel is a quarter arc area, and the fixed area in the area has circular holes opened up and down for connecting with the upper and lower plates for circulation.

7. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 6, characterized in that: The vortex flow channel of the b plate is extended by half a circle more than the corresponding vortex flow channel of the a plate, so that the fluid working medium inside it is the same as the fluid working medium at the outlet of the upper and lower plates.

8. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 7, characterized in that: The cross-section of the vortex flow channel in the vertical direction includes semicircular, elliptical, and rectangular shapes.

9. The printed circuit board heat exchanger with a vortex flow channel structure according to claim 8, characterized in that: The hot and cold working medium flow channels on a single a plate or b plate alternate with each other, and at the same time, the hot and cold working medium at the same position of the upper and lower plates alternate with each other, achieving a three-dimensional heat exchange effect.

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