A cooler for Stirling device

Abstract

The present invention discloses a cooler for a Stirling device, which is arranged between a pressure shell and a cylinder liner, and includes an integrally formed annular base, a diverter plate and an annular top cover, wherein the diverter plate is evenly arranged between the annular base and the annular top cover, and a liquid flow channel is formed between adjacent diverter plates, and a vent hole penetrating the end surface of the annular base and the annular top cover is arranged in the diverter plate, and a water inlet and a water outlet connected to the water inlet end and the water outlet end of the pressure shell are also formed between the diverter plates, and the diverter plates located on both sides of the water inlet and the water outlet are sequentially staggered to form a circuitous flow channel between the cylinder liner and the pressure shell, and water flows in from the water inlet, and flows out through the circuitous flow channel at the water outlet. The configuration of the cooler is suitable for mass production by casting, and the airtightness between the gas path and the water path is easy to achieve, and its economy and reliability are significantly better than the existing shell and tube cooler types in the field.

Description

Technical Field

[0001] The invention relates to the technical field of Stirling devices, in particular to a cooler used for a Stirling device. Background Art

[0002] The Stirling device is based on the Stirling cycle and is a closed-cycle machine that works based on the temperature difference of the heat source. The working medium is usually helium, which is environmentally friendly. At least two movers are required inside the Stirling machine to realize the volume change of the expansion chamber and the compression chamber, thereby achieving the heat-to-work conversion effect. The mover with the end close to the compression chamber is called the power piston or compression piston, and the mover with the end close to the expansion chamber is called the ejector or gas distribution piston. The reciprocating motion of the two movers will drive the working fluid to shuttle back and forth between the expansion chamber and the compression chamber through the adjacent heat exchangers, regenerators, and cooler flow channels. The pressure of the working fluid will undergo periodic changes that are not synchronized with the movers during this process, thereby generating heat-to-work conversion.

[0003] The cooler is arranged between the compression chamber and the normal temperature end face of the regenerator. It is usually of the partition fin type or shell and tube type. The compression heat generated by the working fluid during the compression process is carried and released by the external air flow or water flow. The partition fin type is usually used in small Stirling devices, such as Fig.10 As shown, the water flow channel and the gas channel are located on both sides respectively, and the air tightness is easy to ensure, but the rib efficiency limits its heat exchange efficiency, and the cylinder liner cannot be efficiently cooled.

[0004] Shell and tube coolers are usually used in large and medium-sized Stirling devices. The working fluid runs through the tube side, and the cooling medium runs through the shell side. Reliable airtightness must be ensured between the tube side and the shell side. The conventional process is to drill corresponding array holes on the parallel upper and lower end plates, and the outer periphery of the upper and lower end plates is closed with sleeves to enclose the shell side space. The thin-walled tubes are assembled in the matching holes on the end plates, and then welded one by one or brazed as a whole. The disadvantage of this type of cooler is that the manufacturing process is complicated. Once a weld fails during operation, the entire machine will fail. Specifically, on pages 6 to 8 of the report named "SPDE / SPRE Final Summary Report" by NASA, the parameters and photos of a Stirling shell and tube cooler with 1,548 ventilation pipes are disclosed. The cooler uses a welding process and has a huge number of tube bundles, which makes it costly. Summary of the invention

[0005] In view of the above technical problems, the present invention proposes a cooler for a Stirling device, which completely makes up for the defects of the prior art and is formed in one piece by a casting process, which greatly reduces the production cost; a symmetrical tortuous flow channel is adopted to make the cooling medium flow evenly in the cooler body, and the working fluid airflow and cylinder liner can be effectively cooled, thereby improving the operating stability of the whole machine, and the airtightness between the airflow and the cooling medium can be easily ensured, and the reliability is much higher than that of the traditional shell and tube cooler that relies on welding.

[0006] A cooler for a Stirling device, the cooler is arranged between a pressure shell and a cylinder liner, and comprises an integrally formed annular base, a diverter plate and an annular top cover, the diverter plates are evenly arranged between the annular base and the annular top cover, a liquid flow channel is formed between adjacent diverter plates, air vents are provided in the diverter plates and penetrate the end faces of the annular base and the annular top cover, a water inlet and a water outlet connected to the water inlet end and the water outlet end of the pressure shell are also formed between the diverter plates, the diverter plates located on both sides of the water inlet and the water outlet are staggered in sequence, and a circuitous flow channel is formed between the cylinder liner and the pressure shell, water flows in from the water inlet, and flows out at the water outlet after passing through the circuitous flow channel.

[0007] As a preferred embodiment of the above technical solution, the inner side of the diverter plate is located on the same annular vertical plane, the outer sides of the diverter plates located on both sides of the water inlet and the water outlet are abutted against the pressure shell at intervals, a block is provided on the outer vertical plane of the cylinder liner, and the inner sides of other diverter plates located on both sides of the water inlet and the water outlet are abutted against the block, and a tortuous flow channel is formed between the diverter plate, the cylinder liner, the pressure shell and the block.

[0008] As a preferred embodiment of the above technical solution, the diverter plates located on both sides of the water inlet and the water outlet respectively abut against the cylinder liner and the pressure shell in turn, forming a circuitous flow channel between the cylinder liner and the pressure shell.

[0009] As a preferred embodiment of the above technical solution, the water inlet and the water outlet are arranged in groups.

[0010] As a preferred embodiment of the above technical solution, the liquid flow channel is groove-shaped, and the liquid flow channel is evenly distributed along the circumference of the annular base and the annular top cover.

[0011] As a preferred embodiment of the above technical solution, the cross section of the liquid flow channel is hole-shaped, and the liquid flow channel is evenly distributed along the circumference and axial direction of the annular base and the annular top cover.

[0012] As a preferred embodiment of the above technical solution, the vent holes are evenly distributed along the circumference and radial direction of the annular base and the annular top cover.

[0013] As a preferred embodiment of the above technical solution, an annular boss is provided along the outer circumference of the bottom of the annular base, and the annular boss is integrally formed with the annular base.

[0014] As a preferred embodiment of the above technical solution, the cooler is cast from copper or aluminum.

[0015] The beneficial effects of the present invention are:

[0016] The cooler is formed in one piece using a casting process, which greatly reduces the production cost; a symmetrical tortuous flow channel is used to allow the cooling medium to flow evenly in the cooler body, so that both the working fluid airflow and the cylinder liner can be effectively cooled, thereby improving the operating stability of the entire machine. The airtightness between the airflow and the cooling medium is easily ensured, and the reliability is much higher than that of traditional shell and tube coolers that rely on welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure in which the liquid flow channel in the first embodiment is groove-shaped.

[0018] Figure 2 It is a longitudinal cross-sectional view of the groove-shaped liquid flow channel in the first embodiment.

[0019] Figure 3 It is a cross-sectional view of the groove-shaped liquid flow channel in the first embodiment.

[0020] Figure 4 It is a schematic longitudinal section diagram of the assembly of the cooler with a groove-shaped liquid flow channel, the pressure shell and the cylinder liner in the first embodiment.

[0021] Figure 5 It is a schematic cross-sectional view of the assembly of the cooler with a groove-shaped liquid flow channel, the pressure shell and the cylinder liner in the first embodiment.

[0022] Figure 6 It is a schematic diagram of the structure in which the cross section of the liquid flow channel in the first embodiment is hole-shaped.

[0023] Figure 7 This is a schematic diagram of the structure in which a stopper is provided on the outer surface of the cylinder sleeve in the first embodiment.

[0024] Figure 8 It is a cross-sectional view of the groove-shaped liquid flow channel in the second embodiment.

[0025] Fig. 9 Schematic diagram of the cross section of the assembly of the cooler with a groove-shaped liquid flow channel, the pressure shell and the cylinder liner in the second embodiment

[0026] Fig.10 It is a schematic diagram of the prior art structure.

[0027] The reference numerals are as follows: 1-pressure shell, 2-cylinder liner, 3-annular base, 4-dividing plate, 5-annular top cover, 6-liquid flow channel, 7-vent, 8-water inlet, 9-water outlet, 10-block, 11-annular boss. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] like Figures 1 to 6 A cooler for a Stirling device is shown, and the cooler is arranged between the pressure shell 1 and the cylinder liner 2, and includes an integrally formed annular base 3, a diverter plate 4 and an annular top cover 5. The diverter plates 4 are evenly arranged between the annular base 3 and the annular top cover 5, and a liquid flow channel 6 is formed between adjacent diverter plates 4. The diverter plates 4 are provided with air vents 7 that penetrate the end surfaces of the annular base 3 and the annular top cover 5. A water inlet 8 and a water outlet 9 that are connected to the water inlet end and the water outlet end of the pressure shell 1 are also formed between the diverter plates 4. The diverter plates 4 located on both sides of the water inlet 8 and the water outlet 9 are staggered in sequence to form a circuitous flow channel between the cylinder liner 2 and the pressure shell 1. Water flows in from the water inlet 8, and flows out at the water outlet 9 through the circuitous flow channel.

[0031] In this embodiment, the inner side of the diverter plate 4 is located on the same annular vertical surface, and the outer sides of the diverter plates 4 located on both sides of the water inlet 8 and the water outlet 9 are abutted against the pressure shell 1 at intervals, and a stopper 10 is provided on the outer vertical surface of the cylinder liner 8. The inner sides of the other diverter plates 4 located on both sides of the water inlet 8 and the water outlet 9 abut against the stopper 10, and a tortuous flow channel is formed between the diverter plate 4 and the cylinder liner 2, the pressure shell 1 and the stopper 10.

[0032] In this embodiment, the water inlet 8 and the water outlet 9 are arranged in groups.

[0033] In this embodiment, the liquid flow channel 6 is in a groove shape, and the liquid flow channel 6 is evenly distributed along the circumference of the annular base 3 and the annular top cover 5 .

[0034] In this embodiment, the cross section of the liquid flow channel 6 is hole-shaped, and the liquid flow channel 6 is evenly distributed along the circumference and axial direction of the annular base 3 and the annular top cover 5 .

[0035] In this embodiment, the vent holes 7 are evenly distributed along the circumference and radial direction of the annular base 3 and the annular top cover 5 .

[0036] In this embodiment, an annular boss 11 is provided along the outer circumference of the bottom of the annular base 3 , and the annular boss 11 is integrally formed with the annular base 3 .

[0037] In this embodiment, the cooler is made of copper or aluminum casting.

[0038] The core innovation of the present invention is that by changing the structure of the cooler body, the cooling medium flowing through the circuitous flow channel in the cooler can efficiently cool the working fluid airflow and the cylinder liner. Its configuration can be formed in one step through a casting process. When the cooler is manufactured using the same material, the manufacturing cost of the cooler is approximately 1 / 100 of the current shell and tube cooler manufacturing cost, and is particularly suitable for large and medium-sized machine applications. At the same time, it is easy to ensure airtightness between the working fluid airflow and the cooling medium. An annular sealing groove is provided on the annular base 3 and the annular top cover 5, and an O-ring is filled in the annular sealing groove, so that the airtightness between the cooler and the pressure shell 1 and the cylinder liner 2 can be achieved. It is not easy to fail, and its reliability is significantly better than that of a shell and tube cooler that relies on a large number of welding points.

[0039] Embodiment 2

[0040] like Figure 7 , Figure 8 As shown, the difference between this embodiment and the first embodiment is that the diverter plates 4 located on both sides of the water inlet 8 and the water outlet 9 are respectively pressed against the cylinder liner 2 and the pressure shell 1 in sequence, and a tortuous flow channel is formed between the cylinder liner 2 and the pressure shell 1. Compared with the solution of forming a tortuous flow channel in the first embodiment, the solution of forming a tortuous flow channel in this embodiment has a slightly higher processing difficulty and manufacturing cost.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 cooler for a Stirling device, the cooler being arranged between a pressure shell and a cylinder liner, characterized in that: It includes an integrally formed annular base, a diverter plate and an annular top cover, the diverter plates are evenly arranged between the annular base and the annular top cover, a liquid flow channel is formed between adjacent diverter plates, and air vents are provided in the diverter plates which penetrate the end faces of the annular base and the annular top cover. A water inlet and a water outlet which are connected to the water inlet end and the water outlet end of the pressure shell are also formed between the diverter plates. The diverter plates located on both sides of the water inlet and the water outlet are staggered in sequence to form a circuitous flow channel between the cylinder liner and the pressure shell. Water flows in from the water inlet, passes through the circuitous flow channel, and flows out at the water outlet.

2. The cooler according to claim 1, characterized in that: The inner side of the diverter plate is located on the same annular vertical surface, and the outer sides of the diverter plates located on both sides of the water inlet and the water outlet are pressed against the pressure shell at intervals. A stopper is provided on the outer vertical surface of the cylinder liner, and the inner sides of the other diverter plates located on both sides of the water inlet and the water outlet are pressed against the stopper, and a circuitous flow channel is formed between the diverter plate, the cylinder liner, the pressure shell and the stopper.

3. The cooler according to claim 1, characterized in that: The flow dividers located on both sides of the water inlet and the water outlet respectively abut against the cylinder liner and the pressure shell in turn, forming a circuitous flow channel between the cylinder liner and the pressure shell.

4. The cooler according to claim 1, characterized in that: The water inlets and water outlets are arranged in groups.

5. The cooler according to any one of claims 1 to 4, characterized in that: The liquid flow channel is in a groove shape and is evenly distributed along the circumference of the annular base and the annular top cover.

6. The cooler according to any one of claims 1 to 4, characterized in that: The cross section of the liquid flow channel is hole-shaped, and the liquid flow channel is evenly distributed along the circumference and axial direction of the annular base and the annular top cover.

7. The cooler according to claim 1, characterized in that: The vent holes are evenly distributed along the circumference and radial direction of the annular base and the annular top cover.

8. The cooler according to claim 1, characterized in that: An annular boss is provided along the outer circumference of the bottom of the annular base, and the annular boss is integrally formed with the annular base.

9. The cooler according to claim 1, characterized in that: The cooler is made of copper or aluminum casting.

Images