CN111734548A - Piston assembly for Stirling engine - Google Patents
Piston assembly for Stirling engine Download PDFInfo
- Publication number
- CN111734548A CN111734548A CN202010705400.8A CN202010705400A CN111734548A CN 111734548 A CN111734548 A CN 111734548A CN 202010705400 A CN202010705400 A CN 202010705400A CN 111734548 A CN111734548 A CN 111734548A
- Authority
- CN
- China
- Prior art keywords
- piston
- cavity
- stirling engine
- ring
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims description 19
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 12
- 230000006835 compression Effects 0.000 description 11
- 238000007906 compression Methods 0.000 description 11
- 238000009413 insulation Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/055—Heaters or coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/0535—Seals or sealing arrangements
Abstract
The invention relates to the technical field of Stirling engines, and discloses a piston assembly for a Stirling engine, which comprises a piston seat, a piston rod and a piston top, wherein the lower end of the piston top is fixedly connected with the upper end of the piston seat, the upper end of the piston rod is fixedly connected with the center of the piston seat, a medium cavity is arranged in the piston top, a central hole is formed in the upper end of the piston rod, an air inlet hole communicated with the central hole is formed in the middle of the piston rod, and the upper end of the central hole is communicated with the medium cavity. According to the invention, the medium cavity in the piston top balances the pressure of the hot cavity, so that the overall stability is greatly improved and the service life is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of Stirling engines, in particular to a piston assembly for a Stirling engine.
Background
The stirling engine was invented in 1816 by robusts stirling, a physicist of the united kingdom, and was therefore named "stirling engine". The stirling engine outputs power through a cycle of cooling, compression, heat absorption and expansion of a working medium (hydrogen or helium) in a cylinder, and is also called a heat engine. The stirling engine is an external combustion engine, and its effective efficiency is generally intermediate between that of gasoline engines and diesel engines. In the working process of the Stirling engine, the piston assembly reciprocates at a high speed in the piston cylinder, one end of the piston assembly corresponds to an expansion cavity in the piston cylinder, the other end of the piston assembly corresponds to a compression cavity in the piston cylinder, gaseous media in the expansion cavity and the compression cavity have high air pressure, a piston top is easily damaged under the action of high pressure, and a piston seat is affected by the action of expansion with heat and contraction with cold, so that the service life of the piston seat is seriously affected.
Disclosure of Invention
In order to solve the problems of the piston assembly of the Stirling engine in the prior art, the invention provides the piston assembly for the Stirling engine, which has good heat insulation performance and long service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
the piston assembly for the Stirling engine comprises a piston seat, a piston rod and a piston top, wherein the lower end of the piston top is fixedly connected with the upper end of the piston seat, the upper end of the piston rod is fixedly connected with the center of the piston seat, a medium cavity is arranged in the piston top, a center hole is formed in the upper end of the piston rod, an air inlet hole communicated with the center hole is formed in the middle of the piston rod, and the upper end of the center hole is communicated with the medium cavity. The upper side area of the top of the piston is an expansion cavity, the lower side area of the piston seat is a compression cavity, and the medium cavity can weaken the heat transfer between the expansion cavity and the compression cavity; meanwhile, the expansion cavity is internally provided with a high-pressure medium, and an external gas circuit of the Stirling engine flushes homologous media (the same as the media in the expansion cavity and the compression cavity) into the medium cavity through the gas inlet hole and the central hole, so that the air pressure in the medium cavity and the air pressure in the expansion cavity keep dynamic balance, the internal and external pressure difference of the piston top is greatly reduced, and the service life of the piston top is prolonged.
Preferably, a support sleeve is arranged on the inner side of the lower end of the piston top, the lower end of the support sleeve extends to form a support ring, the outer side surface of the support ring is fixedly connected with the inner side surface of the piston top, the upper end of the piston seat extends upwards to form a connecting ring, and the lower end of the support ring is fixedly connected with the connecting ring; the support sleeve divides the medium cavity into an upper cavity and a lower cavity, and a vent hole for communicating the upper cavity and the lower cavity is formed in the center of the support sleeve. The supporting sleeve increases the supporting strength of the open end of the piston top, the supporting ring on the supporting sleeve is more stably fixedly connected with the connecting ring on the piston seat, and the supporting sleeve divides the medium cavity into two cavities, so that the heat insulation performance of the medium cavity is further increased.
Preferably, the inner wall and the outer wall of the piston top are both provided with corrosion-resistant coatings. The corrosion-resistant coating increases the corrosion resistance of the piston top and prolongs the service life.
Preferably, two annular grooves are formed in the circumferential surface of the piston seat, and a sealing ring is arranged in each annular groove. The annular groove and the sealing ring increase the sealing performance between the piston seat and the piston cylinder.
Preferably, an annular gas storage groove is formed in the position, located between the two annular grooves, on the circumferential surface of the piston seat, and a drainage hole for communicating the annular gas storage groove with the medium cavity is formed in the piston seat. The medium in the medium cavity enters the annular gas storage groove through the drainage hole, so that the air pressure in the annular gas storage groove is kept in dynamic balance with the air pressure in the expansion cavity and the compression cavity, the pressure difference on two sides of the sealing ring is reduced, and the service life of the sealing ring is prolonged; meanwhile, an air film is formed between the sealing ring and the piston cylinder, and the frictional resistance between the piston seat and the piston cylinder is reduced.
Preferably, two sealing rings are arranged in each annular groove, a support ring is arranged between the bottom of each annular groove and the inner ring of each sealing ring, and a guide ring is arranged on the circumferential surface of the piston seat and positioned on the outer side of each annular groove. The outer ring of the sealing ring is kept attached and sealed with the inner wall of the piston cylinder by the supporting ring, and meanwhile, the supporting ring has abrasion compensation performance.
Preferably, the outer side surface of the piston crown comprises a cylindrical surface and a circular table surface, the height of the cylindrical surface accounts for 20% -35% of the total height of the piston crown, and the included angle alpha between the generatrix of the circular table surface and the axis of the piston crown is 0.7-1.3 deg. The cylindrical surface is in clearance fit with the piston cylinder, so that the high-temperature gas in the expansion cavity is reduced to be close to the piston seat, and the resistance of the piston top can be reduced by the circular table surface.
Therefore, the invention has the following beneficial effects: (1) the integral performance is stable, and the service life is long; (2) the pressure of a medium cavity in the piston top is balanced with that of an external expansion cavity, so that the service life of the piston top is prolonged; (3) the pressure in the annular gas storage groove is balanced with the pressure in the external expansion cavity and the compression cavity, so that the service life of the sealing ring is prolonged; meanwhile, an air film is formed between the sealing ring and the inner wall of the piston cylinder so as to reduce the frictional resistance between the piston seat and the piston cylinder.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
3 fig. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 a 3- 3 a 3 in 3 fig. 31 3. 3
Fig. 3 is a schematic view of the connection of the piston crown and the support sleeve.
Fig. 4 is a schematic structural view of the piston seat.
Fig. 5 is a partially enlarged view of the portion B in fig. 4.
In the figure: the piston comprises a piston seat 1, a connecting ring 100, an annular groove 101, a sealing ring 102, a support ring 103, a guide ring 104, an annular air storage groove 105, a drainage hole 106, a piston rod 2, a piston top 3, a cylindrical surface 30, a round table surface 31, a medium cavity 4, an upper cavity 40, a lower cavity 41, a central hole 5, an air inlet 6, a support sleeve 7, a support ring 70 and an air vent 71.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description below:
as shown in fig. 1, 2, 3 and 4, the piston assembly for the stirling engine comprises a piston seat 1, a piston rod 2 and a piston top 3, wherein the lower end of the piston top 3 is fixedly connected with the upper end of the piston seat 1, the upper end of the piston rod 2 is fixedly connected with the center of the piston seat 1, a medium cavity 4 is arranged in the piston top 3, a central hole 5 is arranged at the upper end of the piston rod 2, an air inlet hole 6 communicated with the central hole is arranged at the middle part of the piston rod, and the upper end of the central hole 5 is communicated with the medium cavity 4; a support sleeve 7 is arranged on the inner side of the lower end of the piston top 3, the lower end of the support sleeve 7 extends to form a support ring 70, the outer side surface of the support ring 70 is fixedly connected with the inner side surface of the piston top 3, the upper end of the piston seat 1 extends upwards to form a connecting ring 100, and the lower end of the support ring 70 is fixedly connected with the connecting ring 100; the support sleeve 7 divides the medium cavity 4 into an upper cavity 40 and a lower cavity 41, a vent hole 71 for communicating the upper cavity and the lower cavity is arranged in the center of the support sleeve 7, and the inner wall and the outer wall of the piston top are both provided with corrosion-resistant coatings. The outer side surface of the piston top 3 comprises a cylindrical surface 30 and a circular table surface 31, the height of the cylindrical surface accounts for 20% -35% of the total height of the piston top, the included angle alpha between the generatrix of the circular table surface and the axial line of the piston top is 0.7-1.3 degrees, the height of the circular table surface accounts for 25% of the total height of the piston top in the embodiment, and the included angle alpha between the generatrix of the circular table surface and the axial line of the piston top is 1 degree.
As shown in fig. 4 and 5, two annular grooves 101 are formed on the circumferential surface of the piston seat 1, a sealing ring 102 is arranged in each annular groove, two sealing rings 102 are arranged in each annular groove 101, a support ring 103 is arranged between the bottom of the annular groove 101 and the inner ring of the sealing ring, and a guide ring 104 is arranged on the circumferential surface of the piston seat 1 and positioned outside the annular groove; an annular air storage groove 105 is arranged on the circumferential surface of the piston seat 1 between the two annular grooves, and a drainage hole 106 for communicating the annular air storage groove and the medium cavity is arranged in the piston seat.
The principle of the invention is as follows with reference to the attached drawings: the upper side area of the top of the piston is an expansion cavity, the lower side area of the piston seat is a compression cavity, and the medium cavity can weaken the heat transfer between the expansion cavity and the expansion cavity; meanwhile, a high-pressure medium is arranged in the expansion cavity, and an external gas circuit of the Stirling engine flushes a homologous medium (the same as the medium in the expansion cavity and the compression cavity) into the medium cavity through the gas inlet hole and the central hole, so that the air pressure in the medium cavity and the air pressure in the expansion cavity keep dynamic balance, the internal and external pressure difference of the piston top is greatly reduced, and the service life of the piston top is prolonged; the medium in the medium cavity enters the annular gas storage groove through the drainage hole, so that the air pressure in the annular gas storage groove is kept in dynamic balance with the air pressure in the expansion cavity and the compression cavity, the pressure difference on two sides of the sealing ring is reduced, and the service life of the sealing ring is prolonged; meanwhile, an air film is formed between the sealing ring and the piston cylinder, and the frictional resistance between the piston seat and the piston cylinder is reduced.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.
Claims (7)
1. The piston assembly for the Stirling engine comprises a piston seat, a piston rod and a piston top and is characterized in that the lower end of the piston top is fixedly connected with the upper end of the piston seat, the upper end of the piston rod is fixedly connected with the center of the piston seat, a medium cavity is arranged in the piston top, a central hole is formed in the upper end of the piston rod, an air inlet hole communicated with the central hole is formed in the middle of the piston rod, and the upper end of the central hole is communicated with the medium cavity.
2. A piston assembly for a stirling engine in accordance with claim 1, wherein a support sleeve is provided inside the lower end of the piston crown, the lower end of the support sleeve extends to form a support ring, the outer side surface of the support ring is fixedly connected with the inner side surface of the piston crown, the upper end of the piston seat extends upwards to form a connecting ring, and the lower end of the support ring is fixedly connected with the connecting ring; the support sleeve divides the medium cavity into an upper cavity and a lower cavity, and a vent hole for communicating the upper cavity and the lower cavity is formed in the center of the support sleeve.
3. A piston assembly for a stirling engine in accordance with claim 1 wherein the inner and outer walls of the piston crown are provided with a corrosion resistant coating.
4. A stirling engine structure in accordance with claim 1 or 2, wherein two annular grooves are provided in the circumferential surface of the piston carrier, each annular groove having a sealing ring disposed therein.
5. A Stirling engine according to claim 4, wherein the circumferential surface of the piston holder is provided with an annular air reservoir at a location between the two annular grooves, and the piston holder is provided with a drainage hole for communicating the annular air reservoir with the medium chamber.
6. A Stirling engine according to claim 4, wherein there are two seal rings in each annular groove, a support ring is provided between the bottom of the annular groove and the inner ring of the seal ring, and a guide ring is provided on the circumferential surface of the piston holder outside the annular groove.
7. A stirling engine structure according to claim 1, wherein the outer side of the piston crown comprises a cylindrical surface and a circular table surface, the height of the cylindrical surface accounts for 20 to 35 percent of the total height of the piston crown, and the included angle α between the generatrix of the circular table surface and the axis of the piston crown is 0.7 to 1.3 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010705400.8A CN111734548A (en) | 2020-07-21 | 2020-07-21 | Piston assembly for Stirling engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010705400.8A CN111734548A (en) | 2020-07-21 | 2020-07-21 | Piston assembly for Stirling engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111734548A true CN111734548A (en) | 2020-10-02 |
Family
ID=72655210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010705400.8A Pending CN111734548A (en) | 2020-07-21 | 2020-07-21 | Piston assembly for Stirling engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111734548A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115773189A (en) * | 2023-02-10 | 2023-03-10 | 华热能源科技(苏州)有限公司 | Double-acting Stirling engine piston sealing device |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036018A (en) * | 1976-02-27 | 1977-07-19 | Beale William T | Self-starting, free piston Stirling engine |
| US4185842A (en) * | 1977-07-08 | 1980-01-29 | Nippon Piston Ring Co., Ltd. | Seal ring |
| JPH0719346A (en) * | 1993-06-29 | 1995-01-20 | Sanyo Electric Co Ltd | Sealing member |
| CN1264459A (en) * | 1997-07-16 | 2000-08-23 | 三洋电机株式会社 | Sealing device for gas compressor/expander |
| JP2004325070A (en) * | 2004-06-16 | 2004-11-18 | Sharp Corp | Stirling engine |
| JP2005264854A (en) * | 2004-03-19 | 2005-09-29 | Sharp Corp | Stirling engine and its manufacturing method |
| EP1936244A1 (en) * | 2006-12-19 | 2008-06-25 | Peugeot Citroën Automobiles Sa | Piston of an internal combustion engine equipped with a single-piece sealing system |
| RU172972U1 (en) * | 2016-12-28 | 2017-08-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | STIRLING ENGINE SUBJECTOR |
| RU172973U1 (en) * | 2016-12-21 | 2017-08-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | STIRLING ENGINE PISTON PISTON |
| CN108168136A (en) * | 2018-02-22 | 2018-06-15 | 方舟 | A kind of inflation pressure-equalizing device for acoustic energy refrigeration machine |
| CN110185552A (en) * | 2019-05-27 | 2019-08-30 | 兰州理工大学 | A kind of Stirling engine dynamic sealing system pressure difference compensation method, engine |
| CN212656914U (en) * | 2020-07-21 | 2021-03-05 | 杭州英洛威能源技术有限公司 | Piston assembly for stirling engine |
-
2020
- 2020-07-21 CN CN202010705400.8A patent/CN111734548A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036018A (en) * | 1976-02-27 | 1977-07-19 | Beale William T | Self-starting, free piston Stirling engine |
| US4185842A (en) * | 1977-07-08 | 1980-01-29 | Nippon Piston Ring Co., Ltd. | Seal ring |
| JPH0719346A (en) * | 1993-06-29 | 1995-01-20 | Sanyo Electric Co Ltd | Sealing member |
| CN1264459A (en) * | 1997-07-16 | 2000-08-23 | 三洋电机株式会社 | Sealing device for gas compressor/expander |
| JP2005264854A (en) * | 2004-03-19 | 2005-09-29 | Sharp Corp | Stirling engine and its manufacturing method |
| JP2004325070A (en) * | 2004-06-16 | 2004-11-18 | Sharp Corp | Stirling engine |
| EP1936244A1 (en) * | 2006-12-19 | 2008-06-25 | Peugeot Citroën Automobiles Sa | Piston of an internal combustion engine equipped with a single-piece sealing system |
| RU172973U1 (en) * | 2016-12-21 | 2017-08-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | STIRLING ENGINE PISTON PISTON |
| RU172972U1 (en) * | 2016-12-28 | 2017-08-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет" (Московский Политех) | STIRLING ENGINE SUBJECTOR |
| CN108168136A (en) * | 2018-02-22 | 2018-06-15 | 方舟 | A kind of inflation pressure-equalizing device for acoustic energy refrigeration machine |
| CN110185552A (en) * | 2019-05-27 | 2019-08-30 | 兰州理工大学 | A kind of Stirling engine dynamic sealing system pressure difference compensation method, engine |
| CN212656914U (en) * | 2020-07-21 | 2021-03-05 | 杭州英洛威能源技术有限公司 | Piston assembly for stirling engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115773189A (en) * | 2023-02-10 | 2023-03-10 | 华热能源科技(苏州)有限公司 | Double-acting Stirling engine piston sealing device |
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