High-temperature heat exchanger for stirling engine and stirling engine

Abstract

The application provides a high-temperature heat exchanger for a Stirling engine and the Stirling engine, the high-temperature heat exchanger comprises a cylindrical shell, a circular ring fin group and a plurality of heat pipes, the circular ring fin group is arranged on the inner side of the cylindrical shell and the axes coincide, the plurality of heat pipes are embedded and penetrate through the cylindrical shell and the circular ring fin group along the direction perpendicular to the axis of the cylindrical shell, and the plurality of heat pipes are arranged in parallel with each other. The application realizes increasing the number of the arranged heat pipes, and further increases the contact area of the heat pipes and the circular ring fin group, reduces the circumferential temperature difference in the circular ring fin, enhances the overall heat exchange performance of the high-temperature heat exchanger, and improves the engine efficiency.

Description

Technical Field

[0001] This invention relates to the field of Stirling engine technology, and more particularly to a high-temperature heat exchanger for a Stirling engine and a Stirling engine. Background Technology

[0002] The free-piston Stirling engine is an externally heated regenerative heat engine with advantages such as high efficiency, reliability, and environmental friendliness. A traditional free-piston Stirling engine consists of a room-temperature heat exchanger, a regenerator, a high-temperature heat exchanger, an expansion chamber, a phasor, and a compression chamber. The room-temperature heat exchanger, regenerator, and high-temperature heat exchanger are all annular and connected sequentially, and are coaxially arranged with the phasor. The high-temperature heat exchanger, as a key component of the free-piston Stirling engine, has a significant impact on engine performance.

[0003] The high-temperature heat exchanger in an existing heat pipe-heated free piston Stirling engine mainly consists of a heat exchanger shell, annular fins, and heat pipe inserts. The annular fins are fixed and connected by the heat pipe inserts. The working gas in the system flows alternately between the fins and exchanges heat with the heat pipes through the heat exchanger body.

[0004] The heat exchanger has the following problems: each heat pipe needs to run through the entire annular heat exchanger. Therefore, the arrangement of the heat pipes is greatly restricted, the number of heat pipes is small, the contact area between the heat exchanger and the heat pipes is insufficient, and at the same time, it will also result in long fins between each heat pipe, large circumferential temperature difference in the fins, and poor heat exchange performance. Summary of the Invention

[0005] This invention provides a high-temperature heat exchanger for a Stirling engine and a Stirling engine, which solves the defects of insufficient heat exchange area and poor heat exchange capacity of the existing annular heat exchanger. It increases the contact area between the heat pipe and the heat exchanger body, enhances the heat exchange performance of the heat exchanger, and improves engine efficiency.

[0006] The present invention provides a high-temperature heat exchanger for a Stirling engine, comprising a cylindrical shell, an annular fin assembly, and a plurality of heat pipes. The annular fin assembly is disposed on the inner side of the cylindrical shell and the axes coincide. The plurality of heat pipes are embedded in and pass through the cylindrical shell and the annular fin assembly in a direction perpendicular to the axis of the cylindrical shell, and the plurality of heat pipes are arranged parallel to each other.

[0007] According to the present invention, a high-temperature heat exchanger for a Stirling engine includes a first annular fin unit and a second annular fin unit arranged coaxially. An annular gas separator is provided between the first annular fin unit and the second annular fin unit. The annular gas separator is provided with a plurality of through holes corresponding one-to-one with the heat pipes.

[0008] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein an airflow deflection groove is provided on the inner side of the cylindrical shell, and the first annular fin unit is connected to the second annular fin unit through the airflow deflection groove.

[0009] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein the first annular fin unit includes a plurality of coaxially arranged annular fins, the second annular fin unit includes a plurality of coaxially arranged annular fins, the first annular fin unit is used to communicate with a regenerator, and the second annular fin unit is used to communicate with an expansion chamber.

[0010] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein the annular gas separator is connected to the inner wall of the regenerator.

[0011] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein the annular gas separator is made of copper and the annular fins are made of copper.

[0012] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein the cylindrical shell is made of stainless steel.

[0013] The present invention also provides a Stirling engine, comprising opposing engine units, the engine unit including a room temperature heat exchanger, a regenerator, a phase adjuster, and a high temperature heat exchanger for a Stirling engine as described above, the room temperature heat exchanger, the regenerator, and the high temperature heat exchanger being coaxially connected in sequence, the phase adjuster being inserted into the compression chamber and the expansion chamber formed by the room temperature heat exchanger, the regenerator, and the high temperature heat exchanger, and being movable along the axial direction of the compression chamber within the compression chamber and the expansion chamber.

[0014] According to a Stirling engine provided by the present invention, the length of the phase adjuster is less than or equal to the sum of the axial lengths of the room temperature heat exchanger and the regenerator.

[0015] According to a Stirling engine provided by the present invention, two high-temperature heat exchangers are arranged opposite each other, the airflow turning grooves of the two high-temperature heat exchangers are connected through gas communication holes and / or the high-temperature heat exchangers are provided with central through holes, and the two central through holes are used to connect the two expansion chambers.

[0016] The present invention provides a high-temperature heat exchanger and a Stirling engine for a Stirling engine. By setting a cylindrical shell, an annular fin assembly, and multiple heat pipes, the annular fin assembly is located inside the cylindrical shell and their axes coincide. The multiple heat pipes are embedded in and pass through the cylindrical shell and the annular fin assembly in a direction perpendicular to the axis of the cylindrical shell. The multiple heat pipes are arranged parallel to each other, thereby increasing the number of heat pipes, increasing the contact area between the heat pipes and the annular fin assembly, reducing the circumferential temperature difference in the annular fins, enhancing the overall heat exchange performance of the high-temperature heat exchanger, and improving engine efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the high-temperature heat exchanger for the Stirling engine provided by the present invention;

[0019] Figure 2 This is a longitudinal sectional view of the high-temperature heat exchanger for Stirling engines provided by the present invention;

[0020] Figure 3 This is a cross-sectional view of the high-temperature heat exchanger for Stirling engines provided by the present invention;

[0021] Figure 4 This is a longitudinal sectional view of the engine unit in the Stirling engine provided by the present invention;

[0022] Figure 5 This is a longitudinal sectional view of the Stirling engine provided by the present invention;

[0023] Figure 6 This is a longitudinal sectional view of two opposing high-temperature heat exchangers in a Stirling engine provided by the present invention;

[0024] Figure 7 This is a longitudinal sectional view of the Stirling engine provided by the present invention;

[0025] Figure 8 This is a longitudinal sectional view of two opposing high-temperature heat exchangers in a Stirling engine provided by the present invention;

[0026] Figure label:

[0027] 1: Room temperature heat exchanger; 2: Regenerator; 3: High temperature heat exchanger; 4: Expansion chamber; 5: Phase adjuster; 6: Compression chamber; 7: Columnar shell; 8: First annular finned unit; 9: Heat pipe; 10: Second annular finned unit; 11: Annular gas separator; 12: Airflow turning groove; 14: Gas connecting hole; 15: Central through hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] The following is combined Figures 1 to 3 This invention describes a high-temperature heat exchanger for a Stirling engine, comprising a cylindrical shell 7, an annular fin assembly, and multiple heat pipes 9. The annular fin assembly is located inside the cylindrical shell 7, with their axes coinciding. Multiple heat pipes 9 are embedded in and pass through the cylindrical shell 7 and the annular fin assembly along a direction perpendicular to the axis of the cylindrical shell 7, and are arranged parallel to each other. It is understood that the annular fin assembly is coaxial with the cylindrical shell 7, meaning its axis coincides with the axis of the cylindrical shell 7, and the annular fin assembly is located on the inner bottom side of the cylindrical shell 7. Multiple heat pipes 9 are embedded in and pass through the entire annular fin assembly and the cylindrical shell 7 along a direction perpendicular to the axis of the cylindrical shell 7, achieving relative fixation between the annular fin assembly and the cylindrical shell 7 through the penetration of the heat pipes 9. The multiple heat pipes 9 are arranged parallel to each other, with multiple rows of heat pipes 9 arranged along the axis of the cylindrical shell 7, and multiple heat pipes 9 can be arranged in each row. It is worth noting that in this embodiment, the heat pipes 9 are arranged in two rows along the axis of the cylindrical shell 7. That is to say, using the cylindrical shell 7, compared with the existing annular shell, can effectively increase the number of heat pipes 9 in each row, increase the contact area between the heat pipes 9 and the annular fin assembly, and at the same time reduce the circumferential temperature difference of the annular fin assembly, enhance the heat exchanger's heat exchange capacity, and improve the engine's working efficiency.

[0030] According to the present invention, a high-temperature heat exchanger for a Stirling engine includes an annular fin assembly comprising a first annular fin unit 8 and a second annular fin unit 10 coaxially arranged. An annular gas separator 11 is provided between the first annular fin unit 8 and the second annular fin unit 10, and the annular gas separator 11 has a plurality of through holes corresponding one-to-one with heat pipes 9. It is understood that the annular fin assembly includes a first annular fin unit 8 and a second annular fin unit 10 coaxially arranged, with the second annular fin unit 10 sleeved within the first annular fin unit 8. The air inlet of the first annular fin unit 8 and the air outlet of the second annular fin unit 10 are located on the same side, and the air outlet of the first annular fin unit 8 and the air inlet of the second annular fin unit 10 are also located on the same side, ensuring smooth and uniform gas flow. An annular gas separator 11 is disposed between the first annular fin unit 8 and the second annular fin unit 10 to guide the gas flow, ensuring uniform and stable flow between the inlet and outlet of the first annular fin unit 8 and the second annular fin unit 10, preventing gas erratic movement and ensuring heat exchange efficiency. The annular gas separator 11 has multiple through holes, each corresponding to a heat pipe 9, achieving relative fixation between the annular gas separator 11 and the heat pipe 9, ensuring heat exchange stability. It is worth noting that the axis of the annular gas separator 11 is coaxial with the cylindrical shell 7.

[0031] According to the present invention, a high-temperature heat exchanger for a Stirling engine has an airflow deflection groove 12 on the inner side of a cylindrical shell 7. A first annular fin unit 8 is connected to a second annular fin unit 10 through the airflow deflection groove 12. It is understood that the airflow deflection groove 12 is conical on the inner bottom side of the cylindrical shell 7, enabling communication between the first annular fin unit 8 and the second annular fin unit 10. After entering the airflow deflection groove 12, the gas changes its direction of movement and continues to flow in the opposite direction. That is, the gas in the first annular fin unit 8 enters the airflow deflection groove 12 and then enters the second annular fin unit 10, or the gas in the second annular fin unit 10 enters the airflow deflection groove 12 and then enters the first annular fin unit 8, thus achieving gas flow through the deflection groove 12 between the first annular fin unit 8 and the second annular fin unit 10.

[0032] According to the present invention, a high-temperature heat exchanger for a Stirling engine includes a first annular fin unit 8 comprising multiple coaxially arranged annular fins, and a second annular fin unit 10 comprising multiple coaxially arranged annular fins. The first annular fin unit 8 is connected to a regenerator 2, and the second annular fin unit 10 is connected to an expansion chamber 4. It is understood that the first annular fin unit 8 is composed of multiple coaxially arranged annular fins, and the annular fins are coaxially arranged with the cylindrical shell 7. The first annular fin unit 8 is connected to the regenerator 2, and the second annular fin unit 10 is connected to the expansion chamber 4, enabling gas to enter the first annular fin unit 8 from the regenerator 2, enter the second annular fin unit 10 through the airflow deflection groove 12, and then enter the expansion chamber 4; or, the gas enters the second annular fin unit 10 from the expansion chamber 4, enters the first annular fin unit 8 through the airflow deflection groove 12, and then enters the regenerator 2, achieving reciprocating gas circulation.

[0033] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein an annular gas separator 11 is connected to the inner wall of a regenerator 2. It is understood that the annular gas separator 11 is fixedly connected to the inner wall of the regenerator 2, a first annular fin unit 8 is disposed on the outer side of the annular gas separator 11, and a second annular fin unit 10 is disposed on the inner side of the annular gas separator 11, ensuring the guiding effect on gas flow.

[0034] According to the high-temperature heat exchanger for a Stirling engine provided by the present invention, the annular gas separator 11 is made of copper, and the annular fins are also made of copper. It is understood that both the annular gas separator 11 and the annular fins are made of materials with high thermal conductivity; in this embodiment, copper is selected.

[0035] According to the present invention, a high-temperature heat exchanger for a Stirling engine is provided, wherein the cylindrical shell 7 is made of stainless steel. It is understood that the cylindrical shell 7 and the heat pipe 9 need to have a certain pressure-bearing capacity. In this embodiment, both the cylindrical shell 7 and the heat pipe 9 are made of stainless steel, a material that is not easily deformed.

[0036] The following is combined Figures 4 to 8The present invention also provides a Stirling engine, including an engine unit 10 arranged opposite each other. The engine unit 10 includes a room temperature heat exchanger 1, a regenerator 2, a phase adjuster 5, and a high-temperature heat exchanger 3 for a Stirling engine as described above. The room temperature heat exchanger 1, the regenerator 2, and the high-temperature heat exchanger 3 are coaxially connected in sequence. The phase adjuster 5 is inserted into the compression chamber 6 and the expansion chamber 4 formed by the room temperature heat exchanger 1, the regenerator 2, and the high-temperature heat exchanger 3, and can move axially along the compression chamber 6 within the compression chamber 6 and the expansion chamber 4. It is understood that the opposing arrangement of the engine unit 10 can effectively enhance the heat exchange performance and efficiency of the entire engine, while reducing the vibration generated by the reciprocating motion of the phase adjuster 5 and the alternating flow of gas. The room temperature heat exchanger 1 is connected to the regenerator 2, and the regenerator 2 is connected to the high-temperature heat exchanger 3, both arranged coaxially. The inner space of the room temperature heat exchanger 1 is the compression chamber 6, and the inner space of the regenerator 2 is the expansion chamber 4. The phase adjuster 5 is inserted into the compression chamber 6 and the expansion chamber 4, and moves back and forth along the axial direction of the engine unit 10 within the compression chamber 6 and the expansion chamber 4, causing the internal gas to flow alternately, thereby realizing the conversion of heat and power.

[0037] According to the Stirling engine provided by the present invention, the length of the phase adjuster 5 is less than or equal to the sum of the axial lengths of the room temperature heat exchanger 1 and the regenerator 2. It is understood that the shortening of the length of the phase adjuster 5 compared to the existing phase adjuster 5 results in a more compact overall structure of the engine unit 10.

[0038] According to a Stirling engine provided by the present invention, two high-temperature heat exchangers 3 are arranged opposite each other, and the airflow deflection grooves 12 of the two high-temperature heat exchangers 3 are connected through gas communication holes 14 and / or the high-temperature heat exchangers 3 are provided with central through holes 15, and the two central through holes 15 are used to connect two expansion chambers 4. It is understood that, as Figure 5 and Figure 6 As shown, the high-temperature heat exchangers 3 of the two engine units 10 are arranged opposite each other, and the airflow turning grooves 12 of the two high-temperature heat exchangers 3 are connected through the gas communication holes 14 of the columnar shell 7 to realize the communication of working gas.

[0039] Or, such as Figure 7 and Figure 8 As shown, a central through hole 15 is provided at the center of the cylindrical housing 7. The central through hole 15 is connected to the expansion chamber 4, so that the expansion chambers 4 of the two engine units 10 can be connected through the central through hole 15, thereby realizing the connection of the working gas in the expansion chamber 4 and reducing engine vibration.

[0040] The present invention provides a high-temperature heat exchanger and a Stirling engine for Stirling engines. By setting up a cylindrical shell, an annular fin assembly, and multiple heat pipes, the annular fin assembly is located inside the cylindrical shell and their axes coincide. Multiple heat pipes are embedded in and pass through the cylindrical shell and the annular fin assembly along a direction perpendicular to the axis of the cylindrical shell. The multiple heat pipes are arranged in parallel to each other, thereby increasing the number of heat pipes, increasing the contact area between the heat pipes and the annular fin assembly, reducing the circumferential temperature difference in the annular fins, enhancing the overall heat exchange performance of the high-temperature heat exchanger, and improving engine efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature heat exchanger for a Stirling engine, characterized in that, It includes a cylindrical shell, an annular fin assembly, and multiple heat pipes. The annular fin assembly is located inside the cylindrical shell and their axes coincide. The multiple heat pipes are embedded in and pass through the cylindrical shell and the annular fin assembly in a direction perpendicular to the axis of the cylindrical shell. The multiple heat pipes are arranged parallel to each other. The annular fin assembly includes a first annular fin unit and a second annular fin unit arranged coaxially. An annular gas separator plate is provided between the first annular fin unit and the second annular fin unit. The annular gas separator plate is provided with a plurality of through holes corresponding one-to-one with the heat pipe. The inner side of the columnar shell is provided with an airflow deflection groove, and the first annular fin unit is connected to the second annular fin unit through the airflow deflection groove.

2. The high-temperature heat exchanger for a Stirling engine according to claim 1, characterized in that, The first annular fin unit includes a plurality of coaxially arranged annular fins, and the second annular fin unit includes a plurality of coaxially arranged annular fins. The first annular fin unit is used to communicate with the regenerator, and the second annular fin unit is used to communicate with the expansion chamber.

3. The high-temperature heat exchanger for a Stirling engine according to claim 2, characterized in that, The annular gas separator is connected to the inner wall of the regenerator.

4. The high-temperature heat exchanger for a Stirling engine according to claim 3, characterized in that, The annular gas separator is made of copper, and the annular fins are also made of copper.

5. The high-temperature heat exchanger for a Stirling engine according to any one of claims 1 to 4, characterized in that, The cylindrical shell is made of stainless steel.

6. A Stirling engine, characterized in that, The system includes opposing engine units, each comprising a room temperature heat exchanger, a regenerator, a phase adjuster, and a high-temperature heat exchanger for a Stirling engine as described in any one of claims 1 to 5. The room temperature heat exchanger, the regenerator, and the high-temperature heat exchanger are coaxially connected in sequence. The phase adjuster is inserted into the compression chamber and the expansion chamber formed by the room temperature heat exchanger, the regenerator, and the high-temperature heat exchanger, and is movable along the axial direction of the compression chamber within the compression chamber and the expansion chamber.

7. The Stirling engine according to claim 6, characterized in that, The length of the phase adjuster is less than or equal to the sum of the axial lengths of the room temperature heat exchanger and the regenerator.

8. The Stirling engine according to claim 6, characterized in that, The two high-temperature heat exchangers are arranged opposite each other, and the airflow turning grooves of the two high-temperature heat exchangers are connected through gas communication holes and / or the high-temperature heat exchangers are provided with central through holes, and the two central through holes are used to connect the two expansion chambers.

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