CN216205562U - High temperature heat exchanger for Stirling engine and Stirling engine - Google Patents

Abstract

The utility model provides a high-temperature heat exchanger for a Stirling engine and a Stirling engine. The high-temperature heat exchanger for a Stirling engine comprises a cylindrical shell, an annular fin group and a plurality of heat pipes. The annular fins are assembled on the inner side of the cylindrical shell, and the axes are coincident, and a plurality of the heat pipes are embedded in the direction perpendicular to the axis of the cylindrical shell and penetrate through the cylindrical shell and the annular shape In the fin group, a plurality of the heat pipes are arranged in parallel with each other. The utility model realizes increasing the number of heat pipes, thereby increasing the contact area between the heat pipes and the annular fin group, reducing the circumferential temperature difference in the annular fins, and enhancing the overall heat exchange performance of the high-temperature heat exchanger. Improve engine efficiency.

Description

High temperature heat exchanger for Stirling engine and Stirling engine

technical field

The utility model relates to the technical field of Stirling engines, in particular to a high temperature heat exchanger for a Stirling engine and a Stirling engine.

Background technique

The free-piston Stirling engine is an externally heated regenerative heat engine with the advantages of high efficiency, reliability and environmental protection. A traditional free-piston Stirling engine consists of a room temperature heat exchanger, a regenerator, a high temperature heat exchanger, an expansion chamber, a phase modulator and a compression chamber. Among them, the room temperature heat exchanger, the regenerator and the high temperature heat exchanger are all annular, connected in sequence, and arranged coaxially with the phase modulator. As a key component of a free-piston Stirling engine, the high-temperature heat exchanger has an important impact on the engine performance.

The high-temperature heat exchanger in the existing heat-pipe-heated free-piston Stirling engine is mainly composed of a heat exchanger shell, annular fins and heat-pipe embedded pipes, and each annular fin is fixed and connected by the heat-pipe embedded pipes. Among them, the working gas in the system alternately flows in the fin gap, and exchanges heat with the heat pipe through the heat exchanger body.

There are the following problems in this heat exchanger: each heat pipe needs to run through the entire annular heat exchanger, therefore, the arrangement position of the heat pipe is relatively limited, the number of heat pipes is small, the contact area between the heat exchanger and the heat pipe is insufficient, and at the same time, It will also lead to long fins between the heat pipes, a large circumferential temperature difference in the fins, and poor heat exchange performance.

Utility model content

The utility model provides a high-temperature heat exchanger for a Stirling engine and a Stirling engine, which are used to solve the defects of insufficient heat exchange area and poor heat exchange capacity of the annular heat exchanger in the prior art, and realize the increase of heat pipes and heat exchangers. The contact area of the heat exchanger body enhances the heat exchange performance of the heat exchanger and improves the efficiency of the engine.

The utility model provides a high-temperature heat exchanger for a Stirling engine, which comprises a cylindrical shell, a group of annular fins and a plurality of heat pipes, wherein the group of annular fins is arranged on the inner side of the cylindrical shell, And the axes are coincident, a plurality of the heat pipes are embedded in the direction perpendicular to the axis of the cylindrical casing and penetrate through the cylindrical casing and the annular fin group, and the plurality of the heat pipes are arranged in parallel with each other.

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the annular fin group includes a first annular fin unit and a second annular fin unit that are coaxially arranged. An annular gas partition plate is arranged between the first annular fin unit and the second annular fin unit. A corresponding through hole.

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the inner side of the cylindrical casing is provided with an airflow turning groove, and the first annular fin unit communicates with the air flow turning groove through the airflow turning groove. The second annular fin units communicate with each other.

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the first annular fin unit includes a plurality of annular fins arranged coaxially, and the second annular fin The 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 cavity.

According to the high temperature heat exchanger for Stirling engine provided by the present invention, the annular gas partition plate is connected with the inner side wall of the regenerator.

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the annular gas partition plate is a red copper material partition plate, and the annular fins are red copper fins.

According to a high-temperature heat exchanger for a Stirling engine provided by the utility model, the cylindrical shell is a stainless steel shell.

The present invention also provides a Stirling engine, comprising oppositely arranged engine units, wherein the engine unit includes a room temperature heat exchanger, a regenerator, a phase modulator, and the above-mentioned high-temperature heat exchange for the Stirling engine The room temperature heat exchanger, the regenerator and the high temperature heat exchanger are coaxially connected in sequence, and the phase modulator is inserted into the room temperature heat exchanger, the regenerator and the The high temperature heat exchanger forms the compression cavity and the expansion cavity, and can move along the axial direction of the compression cavity in the compression cavity and the expansion cavity.

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

According to a Stirling engine provided by the present invention, the two high-temperature heat exchangers are arranged opposite to each other, and the airflow turning grooves of the two high-temperature heat exchangers are communicated through gas communication holes and/or the high-temperature heat exchange The device is provided with a central through hole, and the two central through holes are used to communicate with the two expansion chambers.

The high-temperature heat exchanger for a Stirling engine and the Stirling engine provided by the utility model are provided with a cylindrical shell, a group of annular fins and a plurality of heat pipes, and the group of annular fins is arranged on the cylindrical shell. The inner side of the casing, and the axes are coincident, a plurality of the heat pipes are embedded in the direction perpendicular to the axis of the cylindrical casing and penetrate through the cylindrical casing and the annular fin group, and the plurality of the heat pipes are mutually Parallel arrangement can increase the number of heat pipes, thereby increasing the contact area between the heat pipes and the annular fin group, reducing the circumferential temperature difference in the annular fins, and enhancing the overall heat exchange performance of the high temperature heat exchanger. Improve engine efficiency.

Description of drawings

In order to illustrate the technical solutions of the present invention or the prior art more clearly, the following briefly introduces the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are the For some embodiments of the utility model, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.

Fig. 1 is the structural representation of the high temperature heat exchanger for Stirling engine provided by the utility model;

Fig. 2 is the longitudinal sectional view of the high temperature heat exchanger for Stirling engine provided by the utility model;

3 is a transverse cross-sectional view of a high-temperature heat exchanger for a Stirling engine provided by the present invention;

4 is a longitudinal cross-sectional view of an engine unit in a Stirling engine provided by the present invention;

5 is a longitudinal sectional view of a Stirling engine provided by the present utility model;

6 is a longitudinal cross-sectional view of two oppositely arranged high temperature heat exchangers in a Stirling engine provided by the present invention;

Fig. 7 is the longitudinal sectional view of the Stirling engine provided by the utility model;

8 is a longitudinal cross-sectional view of two oppositely arranged high-temperature heat exchangers in a Stirling engine provided by the present invention;

Reference number:

1: Room temperature heat exchanger; 2: Regenerator; 3: High temperature heat exchanger;

4: Expansion chamber; 5: Phase modulator; 6: Compression chamber;

7: cylindrical shell; 8: first annular fin unit; 9: heat pipe;

10: The second annular fin unit; 11: The annular gas partition plate; 12: The airflow turning groove;

14: Gas communication hole; 15: Central through hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are of the present utility model. Some, but not all, embodiments of the novel are disclosed. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The following describes a high-temperature heat exchanger for a Stirling engine of the present invention with reference to FIGS. 1 to 3, including a cylindrical shell 7, a group of annular fins and a plurality of heat pipes 9, and the group of annular fins is arranged in the Inside the cylindrical casing 7, and the axes are coincident, a plurality of heat pipes 9 are embedded in the direction perpendicular to the axis of the cylindrical casing 7 and penetrate through the cylindrical casing 7 and the annular fin group, and the plurality of heat pipes 9 are arranged in parallel with each other. It can be understood that the annular fin group is arranged coaxially with the cylindrical casing 7, that is, the axis of the annular fin group coincides with the axis of the cylindrical casing 7, and the annular fin group is arranged on the cylindrical casing. 7 on the inner bottom side. A plurality of heat pipes 9 are embedded along the direction perpendicular to the axis of the cylindrical shell 7 and penetrate through the entire annular fin group and the cylindrical shell 7 . relatively fixed. The plurality of heat pipes 9 are arranged parallel to each other, and the heat pipes 9 are arranged in a plurality of rows along the axis direction of the cylindrical shell 7 , and each row can be arranged with a plurality of heat pipes 9 . It should be noted that in this embodiment, the heat pipes 9 are arranged in two rows along the axis of the cylindrical housing 7 . That is to say, compared with the existing annular shell, the use of the cylindrical shell 7 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 group, and at the same time reduce the annular fins The circumferential temperature difference of the group increases the heat exchange capacity of the heat exchanger and improves the working efficiency of the engine.

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the annular fin group includes a first annular fin unit 8 and a second annular fin unit 10 arranged coaxially. An annular gas partition plate 11 is provided between the annular fin unit 8 and the second annular fin unit 10 , and the annular gas partition plate 11 is provided with a plurality of through holes corresponding to the heat pipes 9 one-to-one. hole. It can be understood that the annular fin group includes a first annular fin unit 8 and a second annular fin unit 10 that are coaxially arranged, and the second annular fin unit 10 is sleeved on the first annular fin unit 10 . In the 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 first annular fin unit 8 The air outlet and the air inlet of the second annular fin unit 10 are located on the same side to ensure smooth and uniform gas circulation. An annular gas partition plate 11 is arranged between the first annular fin unit 8 and the second annular fin unit 10 to realize the diversion effect on the gas flow. It flows evenly and stably between the air inlet and the air outlet of the second annular fin unit 10 to prevent the gas from running around and ensure the heat exchange efficiency. The annular gas partition plate 11 is provided with a plurality of through holes, and the through holes correspond to the heat pipes 9 one-to-one, so as to realize the relative fixing of the annular gas partition plate 11 and the heat pipes 9 and ensure the stability of heat exchange. It should be noted that the axis of the annular gas partition plate 11 is coaxial with the cylindrical casing 7 .

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the inner side of the cylindrical casing 7 is provided with an airflow turning groove 12, and the first annular fin unit 8 passes through the airflow turning groove 12 and the second annular The fin unit 10 communicates with each other. It can be understood that the inner bottom side of the cylindrical housing 7 is provided with an airflow turning groove 12, and the airflow turning groove 12 is tapered to realize the communication between the first annular fin unit 8 and the second annular fin unit 10. , after the gas enters the airflow turning groove 12, it changes the direction of movement and continues to flow in the opposite direction. That is to say, the gas in the first annular fin unit 8 enters the airflow turning groove 12, and enters the second annular fin unit 10 from the airflow turning groove 12, or the second annular fin unit 10. The gas in the sheet unit 10 enters the airflow turning groove 12, and enters the first annular fin unit 8 from the airflow turning groove 12, so that the gas passes through the airflow turning groove 12 between the first annular fin unit 8 and the first annular fin unit 8. The turning flow between the second annular fin units 10 .

According to a high-temperature heat exchanger for a Stirling engine provided by the present invention, the first annular fin unit 8 includes a plurality of annular fins arranged coaxially, and the second annular fin unit 10 includes For a plurality of coaxially arranged annular fins, the first annular fin unit 8 is used to communicate with the regenerator 2 , and the second annular fin unit 10 is used to communicate with the expansion cavity 4 . It can be understood that the first annular fin unit 8 is constituted by a plurality of annular fins arranged coaxially, and the annular fins are arranged coaxially with the cylindrical housing 7 . The first annular fin unit 8 is used to communicate with the regenerator 2, and the second annular fin unit 10 is used to communicate with the expansion cavity 4, so that the gas enters the first annular fin unit from the regenerator 2 8. Enter the second annular fin unit 10 from the airflow turning groove 12, and then enter the expansion cavity 4, or the gas enters the second annular fin unit 10 from the expansion cavity 4, and enters the first annular fin unit 10 from the airflow turning slot 12. The annular fin unit 8 then enters the regenerator 2 to realize the reciprocating circulation of the gas.

According to the high temperature heat exchanger for Stirling engine provided by the present invention, the annular gas partition plate 11 is connected with the inner side wall of the regenerator 2 . It can be understood that the annular gas partition plate 11 is fixedly connected to the inner side wall of the regenerator 2, the first annular fin unit 8 is arranged on the outer side of the annular gas partition plate 11, and the second annular The shaped fin unit 10 is arranged on the inner side of the annular gas partition plate 11 to ensure the guiding effect on the gas circulation.

According to the high-temperature heat exchanger for Stirling engine provided by the present invention, the annular gas partition plate 11 is made of red copper material, and the annular fins are made of red copper material. It can be understood that the materials of the annular gas partition plate 11 and the annular fins are all made of materials with high thermal conductivity, and in this embodiment, red copper materials are used.

According to the high temperature heat exchanger for Stirling engine provided by the present invention, the cylindrical shell 7 is a stainless steel shell. It can be understood that the cylindrical casing 7 and the heat pipe 9 need to have a certain pressure bearing capacity. In this embodiment, the cylindrical casing 7 and the heat pipe 9 are made of stainless steel that is not easily deformed.

The present invention also provides a Stirling engine, which is described below with reference to FIGS. 4 to 8 , including an engine unit 10 arranged opposite to each other. The engine unit 10 includes a room temperature heat exchanger 1 , a regenerator 2 , a phase modulator 5 and the above The high temperature heat exchanger 3 for the Stirling engine, the room temperature heat exchanger 1, the regenerator 2 and the high temperature heat exchanger 3 are coaxially connected and arranged in sequence, and the phase modulator 5 is inserted into the room temperature heat exchanger 1 and the return heat exchanger 3. The compression chamber 6 and the expansion chamber 4 formed by the heat exchanger 2 and the high temperature heat exchanger 3 can move in the compression chamber 6 and the expansion chamber 4 along the axial direction of the compression chamber 6 . It can be understood that the opposite arrangement of the engine units 10 can effectively enhance the heat exchange performance and efficiency of the entire engine, and at the same time reduce the vibration of the engine due to the reciprocating motion of the phase modulator 5 and the alternating gas flow. Among them, 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, and they are all coaxially arranged. 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 modulator 5 is inserted in the compression chamber 6 and the expansion chamber 4, and reciprocates along the axial direction of the engine unit 10 in the compression chamber 6 and the expansion chamber 4, so that the internal gas flows alternately, so as to realize heat and work. convert.

According to a Stirling engine provided by the present invention, the length of the phase modulator 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 can be understood that the length of the phase modulator 5 is less than or equal to the sum of the lengths of the room temperature heat exchanger 1 and the regenerator 2 along the axial direction. Compared with the existing phase modulator 5, the length is shortened, so that the entire engine unit 10 is shortened. The mechanism is more compact.

According to a Stirling engine provided by the present invention, two high-temperature heat exchangers 3 are arranged opposite to each other, and the airflow turning grooves 12 of the two high-temperature heat exchangers 3 communicate with and/or the high-temperature heat exchanger 3 through the gas communication holes 14 A central through hole 15 is provided, and the two central through holes 15 are used to communicate with the two expansion chambers 4 . It can be understood that, as shown in FIGS. 5 and 6 , the high-temperature heat exchangers 3 of the two engine units 10 are arranged opposite to each other, and the airflow turning grooves 12 of the two high-temperature heat exchangers 3 pass through the gas communication holes of the cylindrical shell 7 . 14 realizes the communication, realizes the communication of the working gas.

Alternatively, as shown in FIGS. 7 and 8 , a central through hole 15 is provided at the center of the cylindrical housing 7 , and the central through hole 15 communicates with the expansion chamber 4 , so that the expansion chambers 4 of the two engine units 10 can pass through the central through hole 15 . Communication, and then realize the communication of the working gas in the expansion chamber 4, and reduce the vibration of the engine.

The high-temperature heat exchanger for a Stirling engine and the Stirling engine provided by the utility model are provided with a cylindrical shell, a group of annular fins and a plurality of heat pipes, and the group of annular fins is arranged on the inner side of the cylindrical shell. , and the axes coincide, a plurality of heat pipes are embedded in the direction perpendicular to the axis of the cylindrical shell and penetrate through the cylindrical shell and the annular fin group, and the plurality of heat pipes are arranged in parallel to each other, so as to increase the number of heat pipes, and thus increase the number of heat pipes. The contact area between the heat pipe and the annular fin group reduces the circumferential temperature difference in the annular fin, enhances the overall heat exchange performance of the high temperature heat exchanger, and improves the engine efficiency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the embodiments of the present invention. and range.

Claims (10)

1. A high-temperature heat exchanger for a Stirling engine, characterized in that it comprises a cylindrical shell, an annular fin group and a plurality of heat pipes, and the annular fin group is arranged on the side of the cylindrical shell. Inside, and the axes are coincident, a plurality of the heat pipes are embedded in the direction perpendicular to the axis of the cylindrical casing and penetrate through the cylindrical casing and the annular fin group, and the plurality of the heat pipes are arranged in parallel with each other. 2 . The high temperature heat exchanger for a Stirling engine according to claim 1 , wherein the annular fin group comprises a first annular fin unit and a second annular fin unit that are coaxially arranged. 3 . Fin unit, an annular gas partition plate is arranged between the first annular fin unit and the second annular fin unit, and the annular gas partition plate is provided with a plurality of through holes corresponding to the heat pipes one-to-one. 3 . The high temperature heat exchanger for a Stirling engine according to claim 2 , wherein the inner side of the cylindrical casing is provided with an airflow turning groove, and the first annular fin unit passes the airflow through the first annular fin unit. 4 . The turning groove communicates with the second annular fin unit. 4 . The high temperature heat exchanger for a Stirling engine according to claim 3 , wherein the first annular fin unit comprises a plurality of annular fins arranged coaxially, and the second annular fin unit comprises a plurality of annular fins arranged coaxially. The annular fin unit includes a plurality of annular fins arranged coaxially, the first annular fin unit is used to communicate with the regenerator, and the second annular fin unit is used to communicate with the regenerator. The expansion chamber communicates. 5 . The high-temperature heat exchanger for a Stirling engine according to claim 4 , wherein the annular gas partition plate is connected to the inner side wall of the regenerator. 6 . 6. The high temperature heat exchanger for a Stirling engine according to claim 5, wherein the annular gas partition plate is a red copper material partition plate, and the annular fin is a red copper material fin piece. 7 . The high temperature heat exchanger for a Stirling engine according to claim 1 , wherein the cylindrical casing is a stainless steel casing. 8 . 8. A Stirling engine, characterized in that it comprises oppositely arranged engine units, the engine units comprising a room temperature heat exchanger, a regenerator, a phase modulator and the one according to any one of claims 1 to 7 The high temperature heat exchanger for Stirling engine, the room temperature heat exchanger, the regenerator and the high temperature heat exchanger are coaxially connected and arranged in sequence, and the phase regulator is inserted into the room temperature heat exchanger , in the compression cavity and the expansion cavity formed by the regenerator and the high temperature heat exchanger, and can move along the axial direction of the compression cavity in the compression cavity and the expansion cavity. 9 . The Stirling engine according to claim 8 , wherein the length of the phase modulator is less than or equal to the sum of the axial lengths of the room temperature heat exchanger and the regenerator. 10 . 10 . The Stirling engine according to claim 8 , wherein the two high-temperature heat exchangers are arranged opposite to each other, and the gas flow turning grooves of the two high-temperature heat exchangers are communicated through gas communication holes and/or The high temperature heat exchanger is provided with a central through hole, and the two central through holes are used to communicate with the two expansion chambers.

Images