Printed circuit board based stirling engine cooler

Abstract

This application relates to the field of Stirling engine cooling technology, specifically to a Stirling engine cooler based on a printed circuit board. The cooler includes: a cooler housing comprising an outer tube, an inner tube, and a slot; the cooler housing is secured to the outer wall of the engine via the slot; air guide plates and heat dissipation plates are fitted onto the outer wall of the inner tube, with multiple air guide plates and heat dissipation plates arranged alternately; a water inlet and a water outlet, one end of which is connected to the internal space of the heat dissipation plate; a first airflow groove and a second airflow groove are provided on the surface of both the air guide plates and the heat dissipation plate. Through the above structural design, this application improves the compactness of the engine cooler, cools the helium gas emitted by the engine through the alternating arrangement of air guide plates and heat dissipation plates, resulting in a larger heat exchange area and higher heat exchange efficiency.

Description

Technical Field

[0001] This application relates generally to the field of Stirling engine cooling technology, and more specifically to a printed circuit board-based Stirling engine cooler. Background Technology

[0002] Traditional Stirling engine coolers mostly adopt a shell-and-tube structure, in which the heat exchange core is made of a large number of tiny capillary bundles brazed to the shell. However, this structure has problems such as low compactness, poor heat exchange effect, flow-induced vibration of the tube bundle, and insufficient stiffness of the tube bundle with a large length-to-slenderness ratio, which restricts the efficient and stable operation of Stirling engines.

[0003] Stirling engines are widely used in underwater propulsion, solar power generation, and combined heat and power (CHP) due to their advantages such as high efficiency, low noise, low emissions, low cost, and multi-fuel adaptability. However, the heat transfer performance of the Stirling cooler directly determines the lower limit temperature of the power cycle and is the key to achieving a high-power, high-efficiency Stirling engine system.

[0004] Currently, printed circuit board (PCB) heat exchangers, with their ultra-compact design and high-pressure resistance, have become a new generation of high-efficiency microchannel heat exchangers, possessing significant heat transfer advantages. Therefore, developing an ultra-compact, high-efficiency heat transfer PCB heat exchanger is of great significance for improving the performance of Stirling engines. Utility Model Content

[0005] To address the issues of existing Stirling engine coolers being structurally uncompacted and having low heat exchange efficiency, this application provides a Stirling engine cooler based on a printed circuit board, which achieves increased heat exchange area and improved heat dissipation efficiency while maintaining a more compact structure.

[0006] According to one aspect of this application, a Stirling engine cooler based on a printed circuit board is provided. The engine cooler includes: a cooler housing, the cooler housing including an outer tube and an inner tube, the inner tube being disposed inside the outer tube; a slot disposed on the inner wall of the inner tube, the cooler housing being secured to the outer wall of the engine via the slot; an annular air intake plate disposed at one end of the cooler housing; multiple air guide plates and heat dissipation plates sleeved on the outer wall of the inner tube, the multiple air guide plates and heat dissipation plates being arranged alternately; a water inlet and a water outlet disposed at intervals on the outer wall of the outer tube, one end of each water inlet and water outlet being connected to the internal space of the heat dissipation plate; a first airflow groove and a second airflow groove are provided on the surface of both the air guide plate and the heat dissipation plate, the first airflow groove and the second airflow groove being interconnected to form a first airflow channel and a second airflow channel, one end of the first airflow channel being connected to the air inlet of the annular air intake plate, the second airflow channel being connected to the first airflow channel, and the end of the second airflow channel away from the annular air intake plate being open.

[0007] In some embodiments, the annular air intake plate includes: an annular bracket disposed at one end of the cooler housing; an annular plate, the outer ring of which is connected to the inner wall of the annular bracket, and the inner ring of which is disposed close to the inner tube; wherein there is a gap between the annular plate and the inner tube, the gap communicating with a first airflow channel; the inner ring of the annular plate is recessed toward the cooler housing.

[0008] In some embodiments, the air guide plate includes: a first circular plate with a first mounting hole on its surface, the first mounting hole being concentrically arranged with the first circular plate, the first circular plate being sleeved on the outer wall of the inner tube through the first mounting hole; a first airflow groove and a second airflow groove on the surface of the first circular plate, the first airflow groove and the second airflow groove being concentrically arranged with the first mounting hole, the first airflow groove being disposed close to the first mounting hole; a plurality of third airflow grooves are provided between the first airflow groove and the second airflow groove on the surface of the first circular plate, the two ends of each third airflow groove being respectively connected to the first airflow groove and the second airflow groove; the third airflow grooves are evenly distributed on the two end faces of the first circular plate.

[0009] In some embodiments, the heat sink includes: a second circular plate with a second mounting hole on its surface, the second mounting hole being concentrically arranged with the second circular plate, the second circular plate being sleeved on the outer wall of the inner tube through the second mounting hole; a first airflow groove and a second airflow groove on the surface of the second circular plate, the first airflow groove and the second airflow groove being concentrically arranged with the second mounting hole, the first airflow groove being close to the second mounting hole; a water pipe mounting groove is provided between the first airflow groove and the second airflow groove on the surface of the second circular plate, the water pipe mounting groove being an annular groove, the water pipe mounting groove being concentrically arranged with the second mounting hole; a plurality of heat dissipation water pipes are evenly distributed in the water pipe mounting groove, the water inlet and the water outlet being connected to each heat dissipation water pipe.

[0010] In some embodiments, the surfaces of the second circular plate and the first circular plate are provided with a water inlet groove and a drain groove; wherein the heat dissipation water pipe is a C-shaped pipe, and each C-shaped pipe is symmetrically arranged with the line connecting the water inlet groove and the drain groove as the axis of symmetry, one end of each C-shaped pipe is connected to the water inlet groove, and the other end is connected to the drain groove; the water inlet groove and the drain groove on the surfaces of the first circular plate and the second circular plate are respectively located close to the water inlet and the water outlet; the water inlet is connected to the water inlet groove, and the water outlet is connected to the drain groove.

[0011] In some embodiments, an annular sealing plate is provided at one end of the cooler housing away from the annular air intake plate; the surface of the annular sealing plate is provided with a second airflow groove, and the second airflow groove on the surface of the annular sealing plate is correspondingly provided with the second airflow grooves on the surfaces of the first circular plate and the second circular plate.

[0012] In some embodiments, the card slot is provided with a plurality of water inlet holes and drain holes, one end of each water inlet hole is connected to a water inlet trough, and one end of each drain hole is connected to a drain trough.

[0013] The embodiments of this application have the following advantages.

[0014] The cooler consists of inner and outer tubes nested together. The inner wall of the inner tube has grooves for securing it to the engine casing surface. Compared to the original shell-and-tube Stirling cooler, this naturally avoids the risk of leakage from the welded joints caused by brazing the tube bundle and end plate. When the engine is running, the helium exhaust port is located on the engine casing and is annular. After the helium is exhausted, it enters the space between the outer and inner tubes through the annular intake plate of the cooler. Several alternating guide plates and cooling plates are arranged between the inner and outer tubes. After entering through the annular intake plate, the helium enters the first airflow channel, allowing for the first airflow... The helium gas inside the channel can be compressed and flow towards the outer tube. The air guide plate is used to horizontally guide the helium gas in the first airflow channel into the second airflow channel. When the helium gas moves on the surface of the air guide plate, cooling water is supplied into the water inlet. The cooling water enters the internal space of the heat sink, circulates inside the heat sink, and is discharged from the drain outlet. During this process, the helium gas on the surface of the air guide plate is cooled by the cooling water inside the heat sink, achieving the purpose of cooling the helium gas. The movement direction of the cooling water intersects with the movement direction of the helium gas, reducing the dead zone of heat exchange and improving the heat exchange efficiency. After being cooled, the helium gas is finally discharged through the second airflow channel.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 A front view of a cooler housing according to an embodiment of this application is shown.

[0019] Figure 2 An embodiment according to this application is shown. Figure 1 A cross-sectional view along the AA direction.

[0020] Figure 3 An embodiment according to this application is shown. Figure 1 A cross-sectional view along the CC direction.

[0021] Figure 4 A schematic diagram of the installation of an annular air intake plate according to an embodiment of this application is shown.

[0022] Figure 5 A schematic diagram of the installation of an annular sealing plate according to an embodiment of this application is shown.

[0023] Figure 6 A schematic diagram of a heat sink structure according to an embodiment of this application is shown.

[0024] Figure 7 A schematic diagram of an air guide plate structure according to an embodiment of this application is shown.

[0025] Figure 8 A schematic diagram of the assembly of a heat sink and an air guide plate according to an embodiment of this application is shown.

[0026] Figure Labels

[0027] 1-Cooler housing; 11-Outer tube; 12-Inner tube; 13-Annular air inlet plate; 131-Annular bracket; 132-Annular plate; 14-Slot; 141-Water inlet hole; 142-Drain hole;

[0028] 2-Air guide plate; 21-First circular plate; 22-First assembly hole; 23-First airflow groove; 24-Second airflow groove; 25-First airflow channel; 26-Second airflow channel; 27-Third airflow groove;

[0029] 3-Heat dissipation plate; 31-Second circular plate; 32-Second assembly hole; 33-Water pipe mounting groove; 34-Heat dissipation water pipe; 35-Water inlet groove; 36-Drain groove;

[0030] 4-Water inlet; 5-Drain outlet; 6-Annular sealing plate. Detailed Implementation

[0031] To make the objectives, solutions, and advantages of the technical solutions of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] As described above, in the use of traditional Stirling engine cooling equipment, the existing cooler structure is not compact enough and the heat exchange effect is poor.

[0034] To at least partially address one or more of the aforementioned problems and other potential issues, an example embodiment of this application provides a Stirling engine cooler based on a printed circuit board. The engine cooler includes: a cooler housing 1, comprising an outer tube 11 and an inner tube 12, the inner tube 12 being disposed within the outer tube 11; a slot 14 disposed on the inner wall of the inner tube 12, through which the cooler housing 1 is secured to the outer wall of the engine; an annular air intake plate 13 disposed at one end of the cooler housing 1; and air guide plates 2 and heat dissipation plates 3, sleeved on the outer wall of the inner tube 12, the air guide plates 2 and heat dissipation plates 3 having multiple... Multiple air guide plates 2 and heat dissipation plates 3 are arranged alternately; water inlets 4 and drain outlets 5 are spaced apart on the outer wall of the outer pipe 11, and one end of each water inlet 4 and drain outlet 5 is connected to the internal space of the heat dissipation plate 3; the surfaces of the air guide plates 2 and heat dissipation plates 3 are provided with a first airflow groove 23 and a second airflow groove 24, which are interconnected to form a first airflow channel 25 and a second airflow channel 26. One end of the first airflow channel 25 is connected to the air inlet of the annular air inlet plate 13, and the second airflow channel 26 is connected to the first airflow channel 25. The end of the second airflow channel 26 away from the annular air inlet plate 13 is open.

[0035] In the above embodiment, the cooler consists of an inner tube 12 and an outer tube 11 nested together. A groove 14 on the inner wall of the inner tube 12 is used to engage with the engine casing surface. Compared to the original shell-and-tube Stirling cooler, this naturally avoids the risk of leakage at the weld joint caused by brazing the tube bundle and end plate. When the engine is running, the engine's helium exhaust port is located at the engine casing and is annular. After the helium is exhausted, it enters the space between the outer tube 11 and the inner tube 12 through the annular air intake plate 13 of the cooler. Several alternating air guide plates 2 and heat dissipation plates 3 are provided between the inner tube 12 and the outer tube 11. After entering through the annular air intake plate 13, the helium enters the first airflow channel 25, causing... The helium gas in the first airflow channel 25 is compressed and flows towards the outer pipe 11. The air guide plate 2 is used to guide the helium gas in the first airflow channel 25 horizontally into the second airflow channel 26. When the helium gas moves on the surface of the air guide plate 2, cooling water is supplied into the water inlet 4. The cooling water enters the internal space of the heat sink 3, circulates in the heat sink 3, and is discharged from the drain outlet 5. During this process, the helium gas on the surface of the air guide plate 2 is cooled by the cooling water in the heat sink 3, achieving the purpose of cooling the helium gas. The movement direction of the cooling water intersects with the movement direction of the helium gas, reducing the dead zone of heat exchange and improving the heat exchange efficiency. The cooled helium gas is finally discharged through the second airflow channel 26.

[0036] Please see Figures 1-8In some embodiments, the annular air intake plate 13 includes: an annular bracket 131 disposed at one end of the cooler housing 1; an annular plate 132, the outer ring of the annular plate 132 being connected to the inner wall of the annular bracket 131, and the inner ring of the annular plate 132 being disposed close to the inner tube 12; wherein there is a gap between the annular plate 132 and the inner tube 12, the gap being connected to the first airflow channel 25; the inner ring of the annular plate 132 is recessed toward the cooler housing 1.

[0037] In the above embodiment, the annular bracket 131 is disposed at one end of the outer shell. The annular bracket 131 is used to install the annular plate 132. The annular plate 132 is recessed inward near the inner tube 12, so that the helium gas blown into the annular air inlet plate 13 flows through the annular plate 132 toward the inner tube 12 and enters the gap between the annular plate 132 and the inner tube 12, thereby allowing the high-temperature helium gas to approach the inner tube 12 and enter the first airflow channel 25.

[0038] Please see Figures 1-8 In some embodiments, the air guide plate 2 includes: a first circular plate 21 with a first mounting hole 22 on its surface, the first mounting hole 22 being concentrically arranged with the first circular plate 21, the first circular plate 21 being sleeved on the outer wall of the inner tube 12 through the first mounting hole 22; a first airflow groove 23 and a second airflow groove 24 on the surface of the first circular plate 21, the first airflow groove 23 and the second airflow groove 24 being concentrically arranged with the first mounting hole 22, the first airflow groove 23 being located close to the first mounting hole 22; a plurality of third airflow grooves 27 are provided between the first airflow grooves 23 and the second airflow grooves 24 on the surface of the first circular plate 21, the two ends of each third airflow groove 27 being connected to the first airflow grooves 23 and the second airflow grooves 24 respectively; the third airflow grooves 27 are evenly distributed on the two end faces of the first circular plate 21.

[0039] In the above embodiment, the first circular plate 21 is sleeved on the outer wall of the inner tube 12 through the first assembly hole 22. The first airflow groove 23 on the surface of the first circular plate 21 is used for helium to flow inside it to the end away from the annular air inlet plate 13. The third airflow groove 27 provided between the first airflow groove 23 and the second airflow groove 24 is used to guide the helium in the first airflow groove 23 into the second airflow groove 24. During this process, the helium in the third airflow groove 27 is cooled by the heat dissipation plate 3 adjacent to the air guide plate 2, so that the helium can pass through each of the first circular plates 21, increasing the heat exchange area of ​​the helium and improving the heat exchange efficiency.

[0040] Please see Figures 1-8In some embodiments, the heat sink 3 includes: a second circular plate 31 with a second mounting hole 32 on its surface, the second mounting hole 32 being concentrically arranged with the second circular plate 31, and the second circular plate 31 being sleeved on the outer wall of the inner tube 12 through the second mounting hole 32; a first airflow groove 23 and a second airflow groove 24 on the surface of the second circular plate 31, the first airflow groove 23 and the second airflow groove 24 being concentrically arranged with the second mounting hole 32, the first airflow groove 23 being located close to the second mounting hole 32; a water pipe mounting groove 33 is provided between the first airflow groove 23 and the second airflow groove 24 on the surface of the second circular plate 31, the water pipe mounting groove 33 being an annular groove, the water pipe mounting groove 33 being concentrically arranged with the second mounting hole 32; a plurality of heat dissipation water pipes 34 are evenly distributed in the water pipe mounting groove 33, and the water inlet 4 and the drain outlet 5 are connected to each heat dissipation water pipe 34.

[0041] In the above embodiment, the second circular plate 31 is sleeved on the outer wall of the inner tube 12 through the second assembly hole 32. The second circular plate 31 and the first circular plate 21 are stacked alternately, so that when helium flows on the surface of the first circular plate 21, the heat dissipation water pipe 34 provided in the second circular plate 31 can exchange heat and cool the helium. The first airflow groove 23 and the second airflow groove 24 on the surface of the second circular plate 31 correspond to the first airflow groove 23 and the second airflow groove 24 on the surface of the first circular plate 21, forming the first airflow channel 25 and the second airflow channel 26.

[0042] Please see Figures 1-8 In some embodiments, the surfaces of the second circular plate 31 and the first circular plate 21 are provided with a water inlet groove 35 and a drain groove 36; wherein the heat dissipation water pipe 34 is a C-shaped pipe, and each C-shaped pipe is symmetrically arranged with the line connecting the water inlet groove 35 and the drain groove 36 as the axis of symmetry, and one end of each C-shaped pipe is connected to the water inlet groove 35 and the other end is connected to the drain groove 36; the water inlet groove 35 and the drain groove 36 on the surfaces of the first circular plate 21 and the second circular plate 31 are respectively located close to the water inlet 4 and the drain outlet 5; the water inlet 4 is connected to the water inlet groove 35, and the drain outlet 5 is connected to the drain groove 36.

[0043] In the above embodiment, the water inlet trough 35 and the drain trough 36 are closed at the end near the inner tube 12 and open at the end near the outer tube 11. The open end is used to connect the water inlet trough 35 and the drain trough 36, so that the water inlet trough 35 and the drain trough 36 on both sides of the multiple stacked first circular plates 21 and second circular plates 31 form a channel for the flow of cooling water, thereby achieving the purpose of supplying the cooling water introduced by the water inlet 4 into each C-shaped tube. When the cooling water moves in the C-shaped tube, it exchanges heat with the helium gas to cool it down. After heat exchange, the cooling water is discharged from the drain trough 36 at the other end of the C-shaped tube into the drainage channel composed of multiple drain troughs 36, and then discharged through the drain outlet 5.

[0044] Please see Figures 1-8In some embodiments, an annular sealing plate 6 is provided at the end of the cooler housing 1 away from the annular air intake plate 13; the surface of the annular sealing plate 6 is provided with a second airflow groove 24, and the second airflow groove 24 on the surface of the annular sealing plate 6 is correspondingly provided with the second airflow groove 24 on the surface of the first circular plate 21 and the second circular plate 31.

[0045] In the above embodiment, the annular sealing plate 6 and the annular air inlet plate 13 are respectively disposed at both ends of the cooler housing 1, so that helium gas enters the space between the inner tube 12 and the outer tube 11 from the annular air inlet plate 13 for heat dissipation. The helium gas after heat dissipation is discharged from the second airflow groove 24 on the surface of the annular sealing plate 6. Since the surface of the annular sealing plate 6 only has the second airflow groove 24, which corresponds to the first airflow groove 23 on the surface of the first circular plate 21, the first airflow groove 23 is not provided. Thus, the first airflow channel 25 formed by the first airflow groove 23 is open at one end near the annular air inlet plate 13 for air intake, and closed at the other end away from the annular air inlet plate 13, so that the helium gas in the first airflow channel 25 can enter the third airflow groove 27 on the surface of the first circular plate 21.

[0046] Please see Figures 1-8 In some embodiments, the slot 14 is provided with a plurality of water inlet holes 141 and drain holes 142, one end of each water inlet hole 141 is connected to the water inlet trough 35, and one end of each drain hole 142 is connected to the drain trough 36.

[0047] In the above embodiment, one end of the water inlet hole 141 and the water outlet hole 142 are connected to the inner wall of the inner tube 12, and the other end are connected to the water inlet groove 35 and the water outlet groove 36 respectively, so that the cooling water in the water inlet groove 35 enters the inner wall of the inner tube 12 through the water inlet hole 141, so that the slot 14 is filled with cooling water to cool the engine, and the cooling water after heat exchange enters the water outlet groove 36 through the water outlet hole 142 and is discharged.

[0048] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0049] The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the various embodiments, or to enable those skilled in the art to understand the embodiments disclosed herein.

[0050] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A printed circuit board based Stirling engine cooler characterized by, Includes: a cooler housing (1), the cooler housing (1) includes an outer tube (11) and an inner tube (12), the inner tube (12) being disposed inside the outer tube (11); The slot (14) is located on the inner wall of the inner tube (12), and the cooler shell (1) is secured to the outer wall of the engine through the slot (14); An annular air intake plate (13) is located at one end of the cooler housing (1); Air guide plate (2) and heat dissipation plate (3) are sleeved on the outer wall of inner tube (12). There are multiple air guide plates (2) and heat dissipation plates (3), and multiple air guide plates (2) and heat dissipation plates (3) are arranged alternately. The inlet (4) and outlet (5) are spaced apart on the outer wall of the outer pipe (11), and one end of the inlet (4) and outlet (5) are connected to the internal space of the heat sink (3). The air guide plate (2) and the heat sink plate (3) are both provided with a first airflow groove (23) and a second airflow groove (24). The first airflow groove (23) and the second airflow groove (24) are interconnected to form a first airflow channel (25) and a second airflow channel (26). One end of the first airflow channel (25) is connected to the air inlet of the annular air intake plate (13). The second airflow channel (26) is connected to the first airflow channel (25). The end of the second airflow channel (26) away from the annular air intake plate (13) is open.

2. The Stirling engine cooler based on a printed circuit board as described in claim 1, characterized in that, The annular air intake plate (13) includes: A ring-shaped bracket (131) is located at one end of the cooler housing (1); An annular plate (132) has an outer ring connected to the inner wall of an annular support (131), and an inner ring of the annular plate (132) is positioned close to the inner tube (12). There is a gap between the annular plate (132) and the inner tube (12), and the gap is connected to the first airflow channel (25); The inner ring of the annular plate (132) is recessed towards the cooler housing (1).

3. A printed circuit board based Stirling engine cooler according to claim 2, characterized in that, The air guide plate (2) includes: The first circular plate (21) has a first mounting hole (22) on its surface. The first mounting hole (22) is concentrically arranged with the first circular plate (21). The first circular plate (21) is sleeved on the outer wall of the inner tube (12) through the first mounting hole (22). The surface of the first circular plate (21) is provided with a first airflow groove (23) and a second airflow groove (24). The first airflow groove (23) and the second airflow groove (24) are concentrically arranged with the first assembly hole (22). The first airflow groove (23) is located close to the first assembly hole (22). A plurality of third airflow grooves (27) are provided between the first airflow groove (23) and the second airflow groove (24) on the surface of the first circular plate (21), and the two ends of each third airflow groove (27) are respectively connected to the first airflow groove (23) and the second airflow groove (24); The third airflow groove (27) is evenly distributed on the two end faces of the first circular plate (21).

4. A printed circuit board based Stirling engine cooler according to claim 3, characterized in that, The heat sink (3) includes: The second circular plate (31) has a second mounting hole (32) on its surface. The second mounting hole (32) is concentrically arranged with the second circular plate (31). The second circular plate (31) is fitted onto the outer wall of the inner tube (12) through the second mounting hole (32). The surface of the second circular plate (31) is provided with a first airflow groove (23) and a second airflow groove (24). The first airflow groove (23) and the second airflow groove (24) are concentrically arranged with the second assembly hole (32). The first airflow groove (23) is located close to the second assembly hole (32). A water pipe mounting groove (33) is provided between the first airflow groove (23) and the second airflow groove (24) on the surface of the second circular plate (31). The water pipe mounting groove (33) is an annular groove and is concentrically arranged with the second assembly hole (32). Several heat dissipation water pipes (34) are evenly distributed in the water pipe installation groove (33), and the water inlet (4) and the drain outlet (5) are connected to each heat dissipation water pipe (34).

5. A printed circuit board based Stirling engine cooler according to claim 4, characterized in that, The surfaces of the second circular plate (31) and the first circular plate (21) are both provided with a water inlet groove (35) and a drain groove (36); wherein The heat dissipation water pipe (34) is a C-shaped pipe. Each C-shaped pipe is symmetrically arranged with the line connecting the water inlet groove (35) and the drain groove (36) as the axis of symmetry. One end of each C-shaped pipe is connected to the water inlet groove (35), and the other end is connected to the drain groove (36). The water inlet groove (35) and the drain groove (36) on the surface of the first circular plate (21) and the second circular plate (31) are respectively located near the water inlet (4) and the drain outlet (5); The inlet (4) is connected to the inlet tank (35), and the outlet (5) is connected to the outlet tank (36).

6. A printed circuit board based Stirling engine cooler according to claim 5, characterized in that, An annular sealing plate (6) is provided at the end of the cooler housing (1) away from the annular air intake plate (13); The surface of the annular sealing plate (6) is provided with a second airflow groove (24), and the second airflow groove (24) on the surface of the annular sealing plate (6) is correspondingly provided with the second airflow groove (24) on the surface of the first circular plate (21) and the second circular plate (31).

7. A printed circuit board based Stirling engine cooler according to claim 6, characterized in that, The slot (14) is provided with several water inlet holes (141) and drain holes (142). One end of each water inlet hole (141) is connected to the water inlet trough (35), and one end of each drain hole (142) is connected to the drain trough (36).

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