CN210178483U - Free piston Stirling engine - Google Patents
Free piston Stirling engine Download PDFInfo
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- CN210178483U CN210178483U CN201920812796.9U CN201920812796U CN210178483U CN 210178483 U CN210178483 U CN 210178483U CN 201920812796 U CN201920812796 U CN 201920812796U CN 210178483 U CN210178483 U CN 210178483U
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Abstract
The utility model relates to the technical field of engines, especially, relate to a free piston stirling engine. This free piston stirling engine includes the stirling that two opposition set up, be equipped with the heat source between two stirling, each stirling all includes casing and heat pipe formula heater, be connected with the intercommunication pipeline between two stirling, the intercommunication pipeline communicates two expansion chamber respectively, or the intercommunication pipeline communicates two compression chamber respectively, or the intercommunication pipeline communicates two back of the body chambeies respectively, the heat pipe formula heater includes heater body and a plurality of heat pipe, the condensation end correspondence of each heat pipe sets up inside each heat pipe embedding hole, the evaporating end of each heat pipe passes the casing respectively and links to each other with the heat source. Free piston stirling, compact structure has reduced the vibration of engine, each stirling all adopts heat pipe formula heater to realize thermal transmission, has effectively reduced the heat loss among the energy transmission, has improved the work efficiency of engine.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to a free piston stirling engine.
Background
The free piston Stirling engine is an externally heated closed circulation piston engine and has the advantages of simple structure, high efficiency, long service life and the like. The heater, as a key component of a free piston stirling engine, has a significant impact on engine performance. The conventional heaters have various specific structural forms, wherein the fin heaters and the shell-and-tube heaters are widely applied.
For a fin heater, the working medium inside the heater is usually gas, and the heat transfer working medium outside the heater is usually heat-carrying fluid. The heat transfer fluid absorbs heat in the heat source and then transfers the heat to the gas to be heated in the heat exchanger. Because the finned heater is processed in a linear cutting mode, the processing cost is high, and the height of the fins is increased along with the increase of the size, so that the heat conduction temperature difference is increased.
For a shell-and-tube heater, working air flows in round tubes in the heater, heat-carrying fluid flows outside the round tubes, and the heat-carrying fluid is in contact with each round tube, so that the temperature of the outer wall of each round tube is relatively close, and the gas in different round tubes cannot have large temperature difference. However, this structure has the following problems: because the alternating flow heat transfer is closely related to the heat penetration depth of the gas, in order to ensure better heat transfer, the round tubes need to be arranged very closely. However, in the actual processing process, it is found that even though the round tubes are arranged very closely, the flow area ratio of the heat exchanger is relatively small, and the number of the round tubes reaches thousands or more with the increase of the heater, so that the reliability is very low.
Therefore, in the process of heating gas by using the heat transfer fluid in the conventional heater, the problems of complicated energy transmission, large heat loss in the energy transmission, corrosion of the heater by the heat transfer fluid and the like exist. Moreover, for a single stirling engine, the high frequency movement of the piston within the engine, the alternating flow of gas and the pressure pulsations can cause the entire device to vibrate, which in turn affects the engine performance.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims at providing a free piston stirling, the problem that heat loss is big in the energy transmission is complicated, the energy transmission of solving the heater existence among the current engine to and the problem of great vibration appears easily at the during operation of single stirling.
(II) technical scheme
In order to solve the technical problem, the utility model provides a free piston Stirling engine, which comprises two Stirling mechanisms arranged oppositely, wherein a heat source is arranged between the two Stirling mechanisms;
each Stirling mechanism comprises a shell, and an expansion cavity, a compression cavity, a back cavity and a heat pipe type heater which are arranged in the shell respectively, wherein the heat pipe type heater is arranged in the expansion cavity;
a communication pipeline is connected between the two Stirling mechanisms and is respectively communicated with the two expansion cavities, or the communication pipeline is respectively communicated with the two compression cavities, or the communication pipeline is respectively communicated with the two back cavities;
the heat pipe type heater comprises a heater body and a plurality of heat pipes, wherein a first end face of the heater body is provided with a plurality of heat pipe embedding holes which are in one-to-one correspondence with the heat pipes, a plurality of gas flow channels are arranged among the heat pipe embedding holes in a staggered mode, each gas flow channel is arranged along the first end face of the heater body to penetrate the second end face, and each gas flow channel is communicated with the expansion cavity respectively; the heat pipes comprise evaporation ends and condensation ends, the condensation ends of the heat pipes are correspondingly arranged in the heat pipe embedding holes, and the evaporation ends of the heat pipes respectively penetrate through the shell to be connected with the heat source.
Specifically, a first central through hole is formed in the middle of the heater body, and the first central through hole is arranged along the first end face of the heater body to penetrate the second end face.
Specifically, each of the heat pipe insertion holes is annularly arranged along a circumferential direction of the first central through hole.
Specifically, each gas flow passage is annularly arranged along the circumferential direction of the first central through hole.
Specifically, each gas flow channel is provided with a heat exchange fin.
Furthermore, a heat regenerator and a cooler are further arranged in the shell, and the heat pipe type heater, the heat regenerator and the cooler are sequentially connected.
Furthermore, a second central through hole is formed in the middle of the heat regenerator, and a third central through hole is formed in the middle of the cooler; the shell is also internally provided with an ejector, and the ejector sequentially penetrates through the first central through hole, the second central through hole and the third central through hole.
Furthermore, one end of the shell, which is close to the heat source, is a heating end, and one end of the shell, which is far away from the heat source, is a cooling end; the heat pipe type heater is positioned at the heating end of the shell.
Further, a power piston is arranged in the shell and is positioned at the cooling end of the shell.
(III) advantageous effects
The above technical scheme of the utility model has following advantage:
the utility model provides a free piston stirling adopts the stirling mechanism that two oppositions set up, not only can reduce the vibration of engine, makes the structure compacter moreover, and two stirling mechanisms all adopt the heat pipe formula heater to realize thermal transmission simultaneously, have effectively improved the work efficiency of engine.
The utility model provides a free piston stirling arranges the heat source in between two stirling for the heat pipe in each heat pipe formula heater can be the straight line and arrange, need not to set to the structure of buckling, thereby has reduced the processing degree of difficulty of heat pipe, and then has reduced manufacturing cost.
The utility model provides a free piston stirling, heat pipe formula heater are in the course of the work, and when the evaporation end of heat pipe was heated, the liquid working medium in the heat pipe evaporated rapidly, and vapour flows to the condensation end of heat pipe under small pressure differential, and condensation end rethread heat conduction gives the heater body with the heat transfer. Because the heater body is provided with the plurality of gas channels, the reciprocating motion of the gas working medium in the gas channels realizes the convection of the gas in the gas channels, thereby transferring the heat from the heater body to the gas working medium. Compared with the traditional heat exchanger, the utility model discloses a heat pipe formula heater that adopts does not need the heat-carrying fluid to come as heat transfer medium, not only makes the heating process simpler, has effectively reduced heat loss in the energy transmission moreover, has improved the heating efficiency of heater, has solved the corrosion problem of heat-carrying fluid to the heat exchanger simultaneously, has increased the life-span of heat exchanger, and then has improved the working property of engine.
Drawings
FIG. 1 is a schematic diagram of a free piston Stirling engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a Stirling mechanism in a free piston Stirling engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a hot tube heater in a free piston Stirling engine according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a heater body in a free piston stirling engine according to an embodiment of the present invention.
In the figure: 1: a heater body; 101: a heat pipe insertion hole; 102: a gas flow channel; 103: a first central through hole; 2: a heat pipe; 201: an evaporation end; 202: a condensing end; 3: a housing; 301: a heating end; 302: a cooling end; 4: a heat pipe type heater; 5: a heat regenerator; 6: a cooler; 7: an expansion chamber; 8: a power piston; 9: an ejector; 10: a heat source; 11: a first stirling mechanism; 12: a second Stirling mechanism; 13: a support frame; 14: a communicating pipe; 15: a compression chamber; 16: a back cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-4, an embodiment of the present invention provides a free piston stirling engine, including two stirling mechanisms disposed opposite to each other, where the two stirling mechanisms are a first stirling mechanism 11 and a second stirling mechanism 12, respectively, and a heat source 10 is disposed between the first stirling mechanism 11 and the second stirling mechanism 12.
Each stirling mechanism includes a housing 3, and an expansion chamber 7, a compression chamber 15, a back chamber 16, and a heat pipe heater 4 respectively disposed in the housing 3, wherein the heat pipe heater 4 is disposed in the expansion chamber 7.
A communication pipe 14 is connected between the first stirling mechanism 11 and the second stirling mechanism 12. The communication pipeline 14 is respectively communicated with the two expansion cavities 7, or the communication pipeline 14 is respectively communicated with the two compression cavities 15, or the communication pipeline 14 is respectively communicated with the two back cavities 16.
In the present embodiment, the communication ducts 14 communicate with the two expansion chambers 7, respectively. By providing the communication duct 14, the same components inside the first stirling mechanism 11 and the second stirling mechanism 12 which are disposed to face each other can be moved in opposite directions, and the inertial force of the moving components on both sides can be offset, thereby achieving the purpose of reducing vibration.
The heat pipe type heater 4 includes a heater body 1 and a plurality of heat pipes 2. A plurality of heat pipe insertion holes 101 corresponding to the heat pipes 2 one to one are formed in a first end surface of the heater body 1, and a plurality of gas flow channels 102 are arranged between the heat pipe insertion holes 101 in a staggered manner. Each of the heat pipes 2 extends from the first end surface to the second end surface of the heater body 1, but each of the heat pipes 2 does not penetrate the second end surface of the heater body 1. Each gas flow channel 102 is arranged to run through the first end surface to the second end surface of the heater body 1, and each gas flow channel 102 is respectively communicated with the expansion cavity 7.
The heat pipes 2 comprise evaporation ends 201 and condensation ends 202, wherein the condensation end 201 of each heat pipe 2 is correspondingly arranged inside each heat pipe embedding hole 101, and the evaporation end 201 of each heat pipe 2 passes through the housing 3 and is connected with the heat source 10.
When the heat pipe type heater 4 works, the evaporation end 201 of each heat pipe 2 is heated in the heat source 10, so that the liquid working medium in the heat pipe 2 is rapidly evaporated, the vapor flows to the condensation end 202 of the heat pipe 2 under a small pressure difference, and the condensation end 202 transfers the heat to the heater body 1 through heat conduction. Because the heater body 1 is provided with the plurality of gas flow channels 102 communicated with the expansion cavities 7, the gas working medium in each expansion cavity 7 can reciprocate in the gas flow channel 102, so that the convection of the gas in the gas flow channels 102 is realized, the heat is further transferred to the gas working medium from the heater body 1, and the heating of the gas working medium is realized. When the temperature of the gas working medium in the expansion cavity 7 reaches the self-starting temperature, the power piston 8 in the shell 3 starts to vibrate, and then the heat input from the outside is converted into the mechanical energy of the reciprocating motion of the power piston 8.
Compared with the traditional heat exchanger, the heat pipe type heater 4 adopted by the embodiment does not need heat-carrying fluid as a heat transfer medium, so that the heating process is simpler, the heat loss in energy transmission is effectively reduced, the heating efficiency of the heater is improved, the corrosion problem of the heat-carrying fluid to the heat exchanger is solved, and the service life of the heat exchanger is prolonged.
The application free piston stirling engine, the stirling that adopts two oppositions to set up, not only can effectively reduce the vibration of engine, make the overall structure of engine compacter moreover, two stirling all adopt heat pipe formula heater 4 to realize thermal transmission simultaneously, effectively improved the work efficiency of engine, and then improved the working property of engine.
The application free piston stirling engine will heat source 10 is arranged in first stirling 11 with between the second stirling 12 for heat pipe 2 homoenergetic in each heat pipe formula heater 4 is the straight line and is arranged, and need not to set heat pipe 2 to the structure of buckling, thereby has reduced heat pipe 2's the processing degree of difficulty, and then has reduced manufacturing cost.
In a further embodiment of the present application, a first central through hole 103 is provided in the middle of the heater body 1, and the first central through hole 103 is disposed through the first end surface to the second end surface of the heater body 1.
In the embodiment of the present application, the heat pipe insertion holes 101 are uniformly arranged in a ring shape along the circumferential direction of the first central through hole 103, so that the heater body 1 is uniformly heated by the heat pipes 2.
In the embodiment of the present application, the gas flow channels 102 are uniformly arranged in a ring shape along the circumferential direction of the first central through hole 103, so that the gas in each gas flow channel 102 is uniformly heated by the heater body 1.
In the embodiment of the present application, heat exchange fins (not shown) are respectively disposed in each gas flow channel 102, and the heat exchange effect of the gas in the gas flow channels 102 is enhanced by the heat exchange fins, so as to further improve the heating efficiency.
In a further embodiment of the present application, a regenerator 5 and a cooler 6 are further disposed in the housing 3, and the heat pipe heater 4, the regenerator 5 and the cooler 6 are connected in sequence.
The middle of the heat regenerator 5 is provided with a second central through hole, the middle of the cooler 6 is provided with a third central through hole, and the first central through hole 103, the second central through hole and the third central through hole are concentrically arranged.
Specifically, an ejector 9 is further disposed in the housing 3, and the ejector 9 is sequentially inserted into the first central through hole 103, the second central through hole, and the third central through hole.
In the specific embodiment of the present application, an end of the housing 3 close to the heat source 10 is a heating end 301, and an end of the housing 3 far from the heat source 10 is a cooling end 302.
Wherein, the heat pipe type heater 4 is located at the heating end 301 of the housing 3. The evaporation ends 201 of the heat pipes 2 in the first stirling mechanism 11 are connected to the left end of the heat source 10 through the heating ends 301 of the first stirling mechanism 11, respectively. The evaporation end 201 of each heat pipe 2 in the second stirling mechanism 12 passes through the heating end 301 of the second stirling mechanism 12 and is connected with the right end of the heat source 10.
In the specific embodiment of the present application, a power piston 8 is further disposed in the housing 3, and the power piston 8 is located at the cooling end 302 of the housing 3.
In the specific embodiment of the present application, the heat source 10 may heat the evaporation end 201 of each heat pipe 2 by combustion heating, may also heat the evaporation end 201 of each heat pipe 2 by solar heat collection heating, may also heat the evaporation end 201 of each heat pipe 2 by industrial waste heat heating, and may also directly heat the heat pipe by coating nuclear fuel on the surface of the evaporation end 201 of each heat pipe 2.
In a further embodiment of the present application, the first stirling mechanism 11 and the second stirling mechanism 12 are connected by a support frame 13.
Specifically, the support bracket 13 connects the housing 3 of the first stirling mechanism 11 and the housing 3 of the second stirling mechanism 12, respectively, so as to ensure the stability and strength of the connection.
To sum up, the embodiment of the utility model provides a free piston stirling, the stirling that adopts two oppositions to set up not only can reduce the vibration of engine, makes the structure compacter moreover, two stirling all adopt the heat pipe formula heater to realize thermal transmission simultaneously, have effectively improved the work efficiency of engine.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, unless otherwise specified, "a plurality" means one or more; "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A free piston stirling engine, characterized in that: the Stirling engine comprises two Stirling mechanisms which are arranged oppositely, and a heat source is arranged between the two Stirling mechanisms;
each Stirling mechanism comprises a shell, and an expansion cavity, a compression cavity, a back cavity and a heat pipe type heater which are arranged in the shell respectively, wherein the heat pipe type heater is arranged in the expansion cavity;
a communication pipeline is connected between the two Stirling mechanisms and is respectively communicated with the two expansion cavities, or the communication pipeline is respectively communicated with the two compression cavities, or the communication pipeline is respectively communicated with the two back cavities;
the heat pipe type heater comprises a heater body and a plurality of heat pipes, wherein a first end face of the heater body is provided with a plurality of heat pipe embedding holes which are in one-to-one correspondence with the heat pipes, a plurality of gas flow channels are arranged among the heat pipe embedding holes in a staggered mode, each gas flow channel is arranged along the first end face of the heater body to penetrate the second end face, and each gas flow channel is communicated with the expansion cavity respectively; the heat pipes comprise evaporation ends and condensation ends, the condensation ends of the heat pipes are correspondingly arranged in the heat pipe embedding holes, and the evaporation ends of the heat pipes respectively penetrate through the shell to be connected with the heat source.
2. The free piston stirling engine of claim 1, wherein: the heater comprises a heater body, wherein a first central through hole is formed in the middle of the heater body, and the first central through hole is arranged along the first end face of the heater body to penetrate the second end face.
3. The free piston stirling engine of claim 2, wherein: each heat pipe embedding hole is annularly arranged along the circumferential direction of the first central through hole.
4. The free piston stirling engine of claim 2, wherein: each gas flow channel is annularly arranged along the circumferential direction of the first central through hole.
5. The free piston stirling engine of claim 1, wherein: and heat exchange fins are respectively arranged in each gas flow channel.
6. The free piston stirling engine of claim 2, wherein: the shell is also internally provided with a heat regenerator and a cooler, and the heat pipe type heater, the heat regenerator and the cooler are sequentially connected.
7. The free piston stirling engine of claim 6, wherein: a second central through hole is formed in the middle of the heat regenerator, and a third central through hole is formed in the middle of the cooler; the shell is also internally provided with an ejector, and the ejector sequentially penetrates through the first central through hole, the second central through hole and the third central through hole.
8. The free piston stirling engine of claim 1, wherein: one end of the shell, which is close to the heat source, is a heating end, and one end of the shell, which is far away from the heat source, is a cooling end; the heat pipe type heater is positioned at the heating end of the shell.
9. The free piston stirling engine of claim 8, wherein: and the shell is also internally provided with a power piston which is positioned at the cooling end of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812796.9U CN210178483U (en) | 2019-05-31 | 2019-05-31 | Free piston Stirling engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812796.9U CN210178483U (en) | 2019-05-31 | 2019-05-31 | Free piston Stirling engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210178483U true CN210178483U (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920812796.9U Active CN210178483U (en) | 2019-05-31 | 2019-05-31 | Free piston Stirling engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210178483U (en) |
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2019
- 2019-05-31 CN CN201920812796.9U patent/CN210178483U/en active Active
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