Displacement device and gamma-type Stirling engine

Abstract

The invention relates to a displacer and a gamma-type Stirling engine, the displacer comprises a main body and a heat conducting wire, the main body comprises a plurality of partition plates, fasteners and a bushing, and the partition plates are coaxially arranged and are connected through the fasteners; the plurality of linings are respectively arranged between two adjacent partition plates and are sleeved on the fasteners, and a plurality of randomly arranged heat exchange holes are formed in the partition plates; and the heat conducting wires are filled between the adjacent partition plates. Compared with an original structure, the displacer is lighter in weight, and an external flywheel can be driven to rotate without assistance of external force, so that an engine is started; the main body of the displacer is designed to be of a multi-layer structure, heat conduction wires are filled between layers, and the multi-layer structure enables heat to be transmitted between the layers in a gradient mode, so that the heat conduction performance of the displacer is the best in the vertical direction of gas flowing and the poorest in the parallel direction of gas flowing. Therefore, the heat exchange efficiency between the working gas and the copper wires and the heat exchange efficiency of the whole engine are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a displacer and a gamma-type Stirling engine. Background Art

[0002] A Stirling engine is an external combustion engine, which has the characteristics of high efficiency, low noise and low pollution. In recent years, with the development of clean energy technology, the application of Stirling engines in the fields of solar power generation, waste heat recovery, etc. has gradually increased. The core of a Stirling engine lies in its thermodynamic cycle, which converts thermal energy into mechanical energy through the reciprocating motion of the working gas between high temperature and low temperature. Stirling engines are mainly divided into three types: alpha type, beta type and gamma type, and each type has its unique structure and application scenarios.

[0003] Such as Figure 1 the displacer structure of the Stirling engine shown, which includes a metal cylinder with a plurality of heat exchange holes opened on the upper and lower bottom surfaces, and copper screen or copper wire is filled in the cylinder; the displacer structure of this kind of structure has a relatively large weight, and the engine needs to be started after an external flywheel connected to the displacer is rotated by an external force, and the thermal conversion efficiency of the whole engine is relatively low. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems that the displacer structure in the prior art has a relatively large weight, the engine needs to be started after an external flywheel connected to the displacer is rotated by an external force, and the thermal conversion efficiency of the whole engine is relatively low.

[0005] To solve the above technical problems, the present invention provides a displacer, including, a main body, the main body includes partitions, fasteners and bushings, a plurality of the partitions are coaxially arranged and connected by a plurality of the fasteners, a plurality of the bushings are provided, and the plurality of bushings are respectively arranged between two adjacent partitions and sleeved on each of the fasteners, a plurality of accommodation spaces are formed between adjacent partitions, and a plurality of randomly arranged heat exchange holes are opened on each of the partitions; heat conducting wires, and the heat conducting wires are filled in each of the accommodation spaces.

[0006] Preferably, the partitions are circular plates, and a plurality of connection holes are vertically opened on each of the partitions and are arranged in an annular array along the edge of the partition, and the fasteners are connected to the partitions through the connection holes.

[0007] Preferably, a plurality of limiting grooves for the ends of each of the bushings to be embedded are opened on the opposite surfaces of two adjacent partitions, and the shape of the limiting grooves matches the shape of the bushings.

[0008] Preferably, a buffer member is further included. The shape of the buffer member is the same as that of the partition plate, and the buffer member is coaxially connected to any one of the two partition plates with the farthest distance.

[0009] Preferably, a connecting rod is vertically connected to the partition plate far from the buffer member, and the connecting rod extends to the side far from the buffer member.

[0010] Preferably, the buffer member is made of high-temperature resistant sponge.

[0011] Preferably, the bushing is of a circular tube structure. The bushing is sleeved on the fastener through its inner hole, and the diameter of the inner hole of the bushing matches the diameter of the fastener.

[0012] Preferably, the partition plate is made of acrylic board.

[0013] Preferably, the heat conducting wire is made of copper wire.

[0014] A gamma-type Stirling engine includes a displacer as described in any one of the above.

[0015] The above technical solution of the present invention has the following beneficial effects compared with the prior art: A displacer and a gamma-type Stirling engine of the present invention include a main body and a heat conducting wire. The main body includes partition plates, fasteners and bushings. A plurality of partition plates are coaxially arranged and connected by a plurality of fasteners. A plurality of bushings are provided, and the plurality of bushings are respectively arranged between two adjacent partition plates and sleeved on each fastener. A plurality of accommodation spaces are formed between adjacent partition plates, and a plurality of randomly arranged heat exchange holes are formed on each partition plate; the heat conducting wire is filled in each accommodation space. In a displacer of the present invention, the main body of the displacer is set as a multi-layer structure connected through heat exchange holes, and heat conducting wires are filled between the layers of each layer; the whole displacer separates the expansion chamber and the compression chamber, so that the upper and lower air chambers are clearly divided between hot and cold, and the multi-layer structure of the displacer enables heat to be transferred in a gradient manner between the layers, making the heat conduction performance of the displacer the best in the vertical direction of gas flow and the worst in the parallel direction of flow, thereby promoting the heat exchange efficiency between the working gas and the copper wire and the heat exchange efficiency of the whole engine. At the same time, the structure of the whole displacer has also become lighter compared with the original structure, and the external flywheel can be driven to rotate without external force assistance to start the engine. Description of the Drawings

[0016] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention and in combination with the drawings, where Figure 1 is a schematic diagram of the overall structure of the displacer of the preferred embodiment of the present invention; Figure 2Is a perspective view of the displacer according to a preferred embodiment of the present invention; Figure 3 Is a schematic structural view of the partition of the displacer according to a preferred embodiment of the present invention from a first perspective; Figure 4 Is a schematic structural view of the partition of the displacer according to a preferred embodiment of the present invention from a second perspective.

[0017] Explanation of reference numerals in the drawings of the specification: 1, main body; 11, partition; 111, heat exchange hole; 112, connection hole; 113, limiting groove; 12, fastener; 13, bushing; 2, heat conducting wire; 3, buffer member; 4, connecting rod. Detailed implementation manners

[0018] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments given are not intended to limit the present invention. Embodiment 1

[0019] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a displacer of the present invention includes Main body 1, the main body 1 includes a partition 11, a fastener 12 and a bushing 13. A plurality of partitions 11 are coaxially arranged and connected by a plurality of fasteners 12. A plurality of bushings 13 are provided, and the plurality of bushings 13 are respectively arranged between two adjacent partitions 11 and sleeved on each fastener 12. A plurality of accommodation spaces are formed between adjacent partitions 11, and a plurality of randomly arranged heat exchange holes 111 are formed in each partition 11; Heat conducting wire 2, and the heat conducting wire 2 is filled in each accommodation space.

[0020] Specifically, the partition 11 is a circular plate and is made of a material such as acrylic that is light in weight and has a certain heat insulation ability. A plurality of connection holes 112 are vertically formed in each partition 11 and are arranged in an annular array along its edge. The connection holes 112 on each partition 11 correspond to the connection holes 112 on other partitions 11 one by one. The corresponding plurality of connection holes 112 form a plurality of connection hole groups for connecting the partitions 11. A plurality of bolts are respectively passed through the plurality of connection holes 112 of a group of connection hole groups and then screwed with nuts to coaxially connect the plurality of partitions 11 together. And when the bolts are inserted, when the bolts pass between two adjacent partitions 11, a bushing 13 is sleeved on each bolt. In this way, the plurality of partitions 11 connected by fasteners form a whole cylindrical layered structure. This layered structure serves as the main body 1 of the displacer. A cylindrical accommodation space is formed between two adjacent partitions 11 of the main body 1, and each accommodation space is filled with a heat conducting wire 2 such as copper wire to form the structure of this heat exchanger.

[0021] Specifically, multiple coaxially spaced partitions 11 of the main body 1 form a layered structure. The partitions 11 (acrylic plates) not only serve as a support structure but also play a certain heat insulation role, enabling heat to be transferred in a gradient manner during the transfer process, reducing local thermal stress, avoiding efficiency losses caused by sudden temperature changes, and thus improving the thermal conversion efficiency of the entire engine.

[0022] A displacer of the present invention has the main body 1 of the displacer arranged in a multi-layer structure. Each layer is connected through a plurality of randomly arranged heat exchange holes 111, and heat conducting wires 2 are filled between the layers of each layer; the whole displacer separates the expansion chamber and the compression chamber, making the upper and lower gas chambers clearly distinguishable between hot and cold. The multi-layer structure of the displacer enables heat to be transferred in a gradient manner between the layers, making the heat conduction performance of the displacer the best in the vertical direction of gas flow and the worst in the parallel direction of flow, thereby promoting the heat exchange efficiency between the working gas and the copper wire and the heat exchange efficiency of the entire engine. At the same time, the structure of the whole displacer becomes lighter compared to the original structure, and it can drive the external flywheel to rotate to start the engine without external force assistance.

[0023] Refer to Figure 3 and Figure 4 As shown, further, the partition 11 is a circular plate, and a plurality of connection holes 112 arranged in a circular array along the edge of the partition 11 are vertically formed on the partition 11. The fastener 12 is connected to the partition 11 through the connection hole 112. Specifically, the fastener 12 can adopt bolts and nuts. The bolts are sequentially passed through a connection hole 112 on each partition 11, and then the nuts are screwed to connect the partitions 11. And the connection hole 112 on the partition 11 in contact with the bolt head of the bolt can be set as a counterbore, so that the bolt head of the bolt sinks into the connection hole 112, making the whole displacer more beautiful. Specifically, the buffer member 3 is also set in a circular plate shape, and the buffer member 3 is made of a material such as sponge. The buffer member 3 can be clamped between the ends of the bolts; it should be noted that it is necessary to ensure that the thickness of the buffer member 3 is greater than the length of the bolt extending out of the partition near the sponge, so as to ensure that the sponge can play a buffering role.

[0024] Furthermore, a plurality of limiting grooves 113 for the ends of the respective bushings 13 to be inserted are provided on the opposite surfaces of two adjacent partitions 11, and the shape of the limiting grooves 113 matches the shape of the bushings 13. Specifically, the shape of the limiting grooves 113 is set according to the shape of the bushings 13. The provision of the limiting grooves 113 on the partitions 11 facilitates the installation of the entire main body 1 and is also conducive to the stability of the entire structure. Specifically, the interlayer height of the layered structure affects the thermal resistance of each layer. When the height is small, the thermal resistance is large; on the contrary, when the height is large, the thermal resistance is small. Therefore, when setting the main body 1 of the displacer, the interlayer height of the two end structures of the main body can be made larger, while the interlayer height of the middle structure can be made smaller. For example, the main body 1 is set as a three-layer structure, the interlayer height of the middle structure is 10 mm, and the interlayer height of both end structures is 16 mm, which is conducive to improving the efficiency of the device.

[0025] Furthermore, a buffer member 3 is further included. The shape of the buffer member 3 is the same as that of the partition 11, and the buffer member 3 is coaxially connected to any one of the two partitions 11 that are farthest apart. Specifically, the buffer member 3 is made of high-temperature resistant sponge, which not only has sufficient air permeability to facilitate heat exchange, but also can play a buffering role to prevent the bottom of the fastener from colliding with the hot-end metal bottom plate and damaging the displacer, which is conducive to improving the service life of the displacer. Specifically, the end of the displacer where the buffer member 3 is provided is its hot end, and the end where the connecting rod is provided is its cold end.

[0026] Refer to Figure 1 and Figure 2 As shown, further, a connecting rod 4 is perpendicularly connected to the partition 11 away from the buffer member 3, and the connecting rod 4 extends towards the side away from the buffer member 3. The connecting rod 4 is used for connecting the displacer to an external piston. The connecting rod 4 can be a bolt.

[0027] Furthermore, the buffer member 3 is made of high-temperature resistant sponge. Since the buffer member 3 is located at the hot end of the engine, the buffer member needs to have a certain high-temperature resistance, and also needs to have a certain buffering performance and air permeability. Using high-temperature resistant sponge for the buffer member 3 can meet the above requirements, but it is not limited to sponge.

[0028] Furthermore, the bushing 13 is a circular tube structure, and the bushing 13 is sleeved on the fastener 12 through its inner hole. The diameter of the inner hole of the bushing 13 matches the diameter of the fastener 12. More preferably, bushings 13 of various different sizes and specifications can be provided. In this way, by replacing different bushings 13, the spacing size between adjacent partitions 11 can be adjusted to meet different usage requirements and improve the versatility and economy of the entire displacer.

[0029] Further, the diameter of the heat exchange holes 111 is between 5 mm and 10 mm. Specifically, the heat exchange holes 111 serve as channels for heat transfer. The more heat exchange holes 111 are provided, the larger the heat contact area between the heat and the heat conducting wire. And reducing the aperture of the heat exchange holes 111 can increase the rotational speed of the entire engine within a certain range.

[0030] Further, the partition 11 is made of acrylic board.

[0031] Further, the heat conducting wire 2 is made of copper wire. Embodiment Two

[0032] The present invention also discloses a preparation method for preparing the above-mentioned displacer, which includes the following steps: Step S1: Take an acrylic board and cut out multiple partitions 11 with a predetermined shape and size, and open connection holes 112 and heat exchange holes 111 with a predetermined number and size on the partitions 11; Step S2: Take a pipe with a predetermined size and cut it to obtain multiple bushings 13 with a predetermined size; Step S3: Take a piece of high-temperature resistant sponge and cut it into a buffer member 3 with a predetermined size; Step S4: Take one of the partitions 11 prepared in Step S1, and respectively insert a bolt into each connection hole 112 of the partition 11 in the same direction. Then place the partition 11 with the inserted bolts on the installation table, and make the end of the bolt head face downward; Step S5: respectively sleeved a bushing 13 obtained in Step S2 on each bolt; Step S6: Lay a layer of heat conducting wire 3 with a predetermined thickness on the partition 11 according to the pre-determined interlayer height; Step S7: Take another partition 11 and insert the connection holes 112 on the partition 11 into the bolts; Step S8: Repeat Steps S5 - S7 until the last partition 11 is installed; Step S9: Screw nuts onto each bolt for fixation; Step S10: Snap the buffer member 3 prepared in Step S3 between the ends of the bolts, and the preparation is completed. Embodiment Three

[0033] The present invention also discloses a γ-type Stirling engine, which includes a displacer as in Embodiment One.

[0034] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A displacer, characterized in that: include, A main body, the main body comprising a partition, a fastener and a bushing, the partition is coaxially arranged with a plurality of fasteners connected, the bushing is provided with a plurality of bushings, the plurality of bushings are respectively arranged between two adjacent partitions and sleeved on each fastener, a plurality of accommodating spaces are formed between adjacent partitions, and a plurality of randomly arranged heat exchange holes are opened on each partition; A heat conductive wire is filled in each of the accommodating spaces.

2. The displacer according to claim 1, characterized in that: The partition is a circular plate, and a plurality of connection holes arranged in a circular array along the edge of the partition are vertically opened on the partition, and the fasteners are connected to the partition through the connection holes.

3. The displacer according to claim 1, characterized in that: A plurality of limiting grooves for the end portions of each bushing to be embedded are provided on opposite sides of two adjacent partitions, and the shape of the limiting grooves matches the shape of the bushings.

4. The displacer according to claim 1, characterized in that: It also includes a buffer, the shape of the buffer is the same as the shape of the partition, and the buffer is coaxially connected to any one of the two partitions that are farthest apart.

5. The displacer according to claim 4, characterized in that: A connecting rod is vertically connected to the partition away from the buffer, and the connecting rod extends to a side away from the buffer.

6. The displacer according to claim 4, characterized in that: The buffer member is made of high temperature resistant sponge.

7. The displacer according to claim 1, characterized in that: The bushing is a circular tube structure, and is sleeved on the fastener through its inner hole. The diameter of the inner hole of the bushing matches the diameter of the fastener.

8. The displacer according to claim 1, characterized in that: The partition is made of acrylic plate.

9. The displacer according to claim 1, characterized in that: The heat conducting wire is made of copper wire.

10. A gamma-type Stirling engine, characterized in that: Comprising a displacer as described in any one of claims 1-9.

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