A helical channel printed circuit board heat exchange unit and heat exchanger

Abstract

The utility model discloses a spiral channel printed circuit board type heat exchange unit and heat exchanger belongs to heat exchanger technical field. The heat exchange unit is formed by heat exchange board, cold heat exchange board and baffle, and is respectively equipped with spiral flow channel on two heat exchange boards and is completely cut through and forms rectangular section channel, wherein the hot fluid flows outward by spiral flow channel from the center import through -hole, and the cold fluid is reversed spiral flow to the center export by the periphery import through -hole, forms the counter current heat exchange. Multiple heat exchange units and baffle are alternately superimposed, and the diffusion welding is formed into the heat exchange core body, and each layer through -hole is superimposed and forms the cold and hot fluid import and export pipeline. Adopt laser cutting to replace chemical etching process to manufacture flow channel, and simplify the process, reduce pollution. Spiral flow channel enhances fluid disturbance and destroys boundary layer, and cooperates with counter current design to improve heat exchange efficiency, and compact structure is applicable to extreme working conditions such as high temperature and high pressure, and expands the application range of PCHE heat exchanger in the energy field.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, specifically to a spiral channel printed circuit board type heat exchange unit and heat exchanger. Background Technology

[0002] Heat exchangers are general-purpose devices for heat exchange and play an indispensable role in industrial production. Traditional heat exchangers come in many types, including shell-and-tube, plate, and plate-fin types. Among them, the Printed Circuit Heat Exchanger (PCHE) is a new type of compact and efficient heat exchanger with characteristics such as high temperature and high pressure resistance, and has broad application potential in fields such as nuclear energy, liquefied natural gas, waste heat recovery, and hydrogen energy.

[0003] However, most flow channels on PCHE heat exchangers are currently formed by chemical etching. Chemical etching uses chemical solutions to corrode the material surface. This process involves complex chemical flows, is lengthy and involves many steps, requires strict control of each step, demands high levels of chemical knowledge from operators, and also causes some environmental pollution, requiring the treatment of chemical waste. Furthermore, it is not suitable for processing complex shapes.

[0004] Therefore, there is an urgent need to develop a new type of PCHE heat exchange unit that can avoid the complex process of chemical etching, reduce the difficulty of channel manufacturing, and increase the heat exchange capacity, thereby expanding its application range in various extreme conditions or space-constrained occasions. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a spiral channel printed circuit board type heat exchange unit and heat exchanger.

[0006] In a first aspect, this application provides a spiral channel printed circuit board type heat exchange unit, including a heat exchange plate, a cold heat exchange plate, and a partition plate located between the two. The heat exchange plate is provided with a hot fluid inlet through hole, a hot fluid outlet through hole, and a spiral flow channel connecting the two. The cold heat exchange plate is provided with a cold fluid inlet through hole, a cold fluid outlet through hole, and a spiral flow channel connecting the two. The partition plate is provided with four through holes, respectively connected to... Hot fluid inlet through-hole, hot fluid outlet through-hole, cold fluid inlet through-hole and the corresponding cold fluid outlet through hole is connected; among which, hot The middle spiral section of the spiral flow channel on the heat exchange plate and the cold heat exchange plate completely overlaps, and the cross-section of the flow channel is rectangular. After the hot fluid enters the spiral flow channel through the hot fluid inlet hole, it flows from the inside to the outside to the hot fluid outlet hole. After the cold fluid enters the spiral flow channel through the cold fluid inlet hole, it flows from the outside to the inside to the cold fluid outlet hole. The two fluids are separated by a partition and exchange heat in a counter-current manner.

[0007] Furthermore, the inlet and outlet sections of the spiral channel are arc-shaped transition sections that smoothly connect with the spiral section, which is a continuous involute or Archimedean spiral.

[0008] Furthermore, the hot fluid inlet and cold fluid outlet are located in the central region of the heat exchange unit, while the hot fluid outlet and cold fluid inlet are located in the outer peripheral region of the heat exchange unit.

[0009] Furthermore, the spiral flow channel is formed by completely cutting through the heat exchange plate.

[0010] Furthermore, the four through holes on the partition are symmetrically arranged, and their diameters are consistent with the through holes on the corresponding heat exchange plates. The positions of the through holes satisfy the requirement that they form a continuous fluid channel after being superimposed.

[0011] Secondly, this application also provides a spiral channel printed circuit board heat exchanger, comprising: multiple heat exchange units and multiple baffles, wherein the heat exchange units and baffles are alternately stacked and formed into an integrated heat exchange core by diffusion welding; a cover plate is welded to the top and bottom of the heat exchange core; the hot fluid inlet through hole, hot fluid outlet through hole, cold fluid inlet through hole and cold fluid outlet through hole of the multiple heat exchange units are respectively superimposed with the corresponding through holes on the baffles to form a hot fluid inlet pipe, a hot fluid outlet pipe, a cold fluid inlet pipe and a cold fluid outlet pipe that penetrate the heat exchange core.

[0012] Furthermore, the stacking direction of the heat exchange units is as follows: a partition is set between two adjacent heat exchange units, and the cold heat exchange plates and the hot heat exchange plates are arranged alternately.

[0013] Key design features of this utility model:

[0014] The heat exchange unit adopts a structure of heat exchange plate + baffle plate + cold heat exchange plate. This design allows the flow channel on the heat exchange plate to completely cut through the heat exchange plate, forming a rectangular cross-section flow channel.

[0015] Except for the inlet and outlet sections, which are arc-shaped, most of the flow channels on the hot and cold heat exchange plates are spiral-shaped and the hot and cold flow channels completely overlap.

[0016] Hot fluid enters the flow channel through the hot inlet holes inside the heat exchange plate and flows to the outlet holes outside the heat exchange plate through the spiral flow channel; conversely, cold fluid enters the flow channel through the cold inlet holes outside the heat exchange plate and flows to the outlet holes inside the heat exchange plate through the spiral flow channel.

[0017] Several heat exchange units and several partitions are stacked together and welded together using diffusion welding to form a heat exchange core. A cover plate is welded to the top and bottom of the heat exchange core to form a complete spiral channel printed circuit board heat exchanger.

[0018] Several hot and cold heat exchange plates and several through holes on the partition plates are superimposed to form hot fluid inlet and outlet channels and cold fluid inlet and outlet channels.

[0019] The beneficial effects of this utility model are:

[0020] Cutting through the flow channels of the heat exchange plate allows for the use of methods such as laser cutting to manufacture the channels, thus avoiding the use of chemical etching, eliminating complex manufacturing processes, reducing environmental pollution, and lowering the difficulty of channel manufacturing.

[0021] The spiral flow channel causes the fluid to constantly change its flow direction, increasing fluid turbulence and helping to disrupt the boundary layer, thereby enhancing heat transfer.

[0022] The two fluids exchange heat within the channels of the hot and cold heat exchange plates. The fully penetrating channel structure separates the hot and cold fluids by only one layer of partition. One fluid flows from the internal pipe inlet to the external outlet pipe, while the other flows from the external pipe inlet to the internal outlet pipe. The two fluids flow in opposite directions, which helps to enhance the heat exchange effect.

[0023] Rectangular cross-section flow channels have better overall heat transfer performance than semi-circular cross-section flow channels. Attached Figure Description

[0024] Figure 1 Schematic diagram of the structure A of the spiral channel printed circuit board type heat exchange plate of this utility model;

[0025] Figure 2 Schematic diagram of the structure B of the spiral channel printed circuit board type heat exchange plate of this utility model.

[0026] Figure 3 Schematic diagram of the spiral channel printed circuit board type partition C structure of this utility model;

[0027] Figure 4 A schematic diagram of the planar structure of the spiral channel printed circuit board heat exchange unit of this utility model;

[0028] Figure 5 Schematic diagram of the planar structure of the spiral channel printed circuit board heat exchange unit of this utility model;

[0029] Figure 6 Schematic diagram of the spiral channel printed circuit board heat exchanger of this utility model;

[0030] Among them, 1. Hot fluid outlet through hole; 2. Cold fluid inlet through hole; 3. Hot fluid inlet through hole; 4. Cold fluid outlet through hole; 5. Hot fluid channel; 6. Cold fluid channel; A is a heat exchange plate; B is a cold heat exchange plate; C is a partition; 1D is a hot fluid outlet pipe; 2D is a cold fluid inlet pipe; 3D is a hot fluid inlet pipe; 4D is a cold fluid outlet pipe; Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] A spiral channel printed circuit board type heat exchange unit includes: a heat exchange plate A, a cold heat exchange plate B, and a partition plate C.

[0033] The heat exchange unit requires both hot and cold heat exchange plates. The flow channel completely cuts through the hot and cold heat exchange plates to form a rectangular cross-section channel, which can be manufactured using laser cutting, water jet cutting, or other methods instead of chemical etching. Except for the inlet section, the spiral channel sections of the hot and cold flow channels are completely overlapped. Figure 1 This is a schematic diagram of structure A of a spiral channel printed circuit board type heat exchanger plate. Figure 2 This is a schematic diagram of the spiral channel printed circuit board type cold heat exchange plate B. Figure 3 This is a schematic diagram of the partition structure between the heat exchange plates.

[0034] Figure 4 , Figure 5 This is a schematic diagram of the planar structure of the spiral channel printed circuit board heat exchange unit of this utility model. Hot fluid enters hot fluid channel 5 through hot fluid inlet hole 3, flowing from the inside to the outside, and finally exits through hot fluid outlet hole 1; cold fluid enters cold fluid channel 6 through cold fluid inlet hole 2, flowing from the outside to the inside, and finally exits through cold fluid outlet hole 4. The hot and cold fluids flow in a counter-current manner. The right side of the figure is a cross-sectional view of the left view, where A is the heat exchange plate, B is the cold heat exchange plate, and C is the baffle plate. The hot and cold fluids are separated only by baffle plate C when flowing within the channels.

[0035] Figure 6 This utility model provides a spiral channel printed circuit board heat exchanger, which is composed of several heat exchange units and several partitions stacked together. The stacking method is as follows: the cold heat exchange plate surface of the first heat exchange unit is stacked with a partition, then the other side of the partition is stacked with the hot heat exchange plate surface of the second heat exchange unit, and so on, with several heat exchange units and several partitions stacked together, and then welded into one piece by diffusion welding. The inlet and outlet through holes on the hot heat exchange plate, the through holes on the partition, and the inlet and outlet through holes on the cold heat exchange plate are stacked to form a 1D hot fluid outlet pipe, a 2D cold fluid inlet pipe, a 3D hot fluid inlet pipe, and a 4D cold fluid outlet pipe.

Claims

1. A spiral channel printed circuit board heat exchange unit, characterized in that, include: A heat exchange plate (A), a cold heat exchange plate (B), and a partition plate (C) located between them; the heat exchange plate (A) is provided with a hot fluid inlet through hole (3), a hot fluid outlet through hole (1), and a spiral flow channel (5) connecting the two; the cold heat exchange plate (B) is provided with a cold fluid inlet through hole (2), a cold fluid outlet through hole (4), and a spiral flow channel (6) connecting the two; the partition plate (C) is provided with four through holes, which are respectively connected to the hot fluid inlet through hole (3), the hot fluid outlet through hole (1), and the cold fluid inlet through hole (2). The cold fluid outlet through hole (4) is connected to the corresponding cold fluid outlet through hole (4); wherein, the middle spiral section of the spiral flow channel (5, 6) on the heat exchange plate (A) and the cold heat exchange plate (B) completely overlaps, and the cross-section of the flow channel is rectangular; after the hot fluid enters the spiral flow channel (5) through the hot fluid inlet through hole (3), it flows from the inside to the outside to the hot fluid outlet through hole (1), and after the cold fluid enters the spiral flow channel (6) through the cold fluid inlet through hole (2), it flows from the outside to the inside to the cold fluid outlet through hole (4). The two fluids are separated by the partition (C) and exchange heat in a counter-current manner.

2. The spiral channel printed circuit board heat exchange unit according to claim 1, characterized in that: The spiral sections of the spiral channels (5, 6) are either continuous involutes or Archimedean spirals.

3. The spiral channel printed circuit board heat exchange unit according to claim 1, characterized in that: The hot fluid inlet hole (3) and the cold fluid outlet hole (4) are located in the central region of the heat exchange unit, while the hot fluid outlet hole (1) and the cold fluid inlet hole (2) are located in the outer peripheral region of the heat exchange unit.

4. The spiral channel printed circuit board heat exchange unit according to claim 1, characterized in that: The inlet and outlet sections of the spiral flow channels (5, 6) are arc-shaped transition sections that are smoothly connected to the spiral section.

5. The spiral channel printed circuit board heat exchange unit according to claim 1, characterized in that: The spiral channels (5, 6) are formed by completely cutting through the heat exchange plate.

6. The spiral channel printed circuit board heat exchange unit according to claim 1, characterized in that: The four through holes on the partition plate (C) are arranged symmetrically, and their diameters are consistent with the through holes on the corresponding heat exchange plates. The positions of the through holes satisfy the requirement that they form a continuous fluid channel after being superimposed.

7. A spiral channel printed circuit board heat exchanger, characterized in that, include: Multiple heat exchange units as described in any one of claims 1-6, and multiple partitions (C); the heat exchange units and partitions (C) are alternately stacked and formed into an integrated heat exchange core by diffusion welding; the top and bottom of the heat exchange core are respectively welded with cover plates; the hot fluid inlet through hole (3), hot fluid outlet through hole (1), cold fluid inlet through hole (2) and cold fluid outlet through hole (4) of the multiple heat exchange units are respectively superimposed with the corresponding through holes on the partitions (C) to form a hot fluid inlet pipe (3D), a hot fluid outlet pipe (1D), a cold fluid inlet pipe (2D) and a cold fluid outlet pipe (4D) penetrating the heat exchange core.

8. A spiral channel printed circuit board heat exchanger according to claim 7, characterized in that: The stacking direction of the heat exchange units is as follows: a partition (C) is set between two adjacent heat exchange units, and the cold heat exchange plate (B) and the hot heat exchange plate (A) are arranged alternately.

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