CN102519178B - Free piston expander - Google Patents
Free piston expander Download PDFInfo
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- CN102519178B CN102519178B CN 201110401498 CN201110401498A CN102519178B CN 102519178 B CN102519178 B CN 102519178B CN 201110401498 CN201110401498 CN 201110401498 CN 201110401498 A CN201110401498 A CN 201110401498A CN 102519178 B CN102519178 B CN 102519178B
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- regenerator
- cooling cylinder
- cold finger
- cold
- drive rod
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Abstract
The invention relates to a free piston expander and belongs to the field of low temperature refrigeration. The expander comprises a plate spring, a clearance sealing seat, a heat regenerator, a cold finger, a cold cylinder, a driving rod, an end cover, a tube connector and external equipment compressor. The cold cylinder and the cold finger are of an integrated structure. One or more plate springs are arranged in the cold cylinder. The center of the plate spring is provided with a hole. Both ends of the plate spring are fixed on the cold cylinder. The heat regenerator is positioned in the cold finger. A metal wire braided square hole net is filled in the heat regenerator. The driving rod is arranged at the front end of the heat regenerator. The driving rod extends into the cold cylinder, passes through the center of the plate spring and is fixedly connected with the center of the plate spring. The clearance sealing seat is positioned at the junction of the cold cylinder and an inner cavity of the cold finger. The application of the plate spring takes a rigid supporting effect. A driving motor is arranged in the cold cylinder, so that the energy consumption is reduced.
Description
Technical field
The present invention relates to a kind of free-piston decompressor, belong to the cryogenic refrigeration field.
Background technology
Sterlin refrigerator is owing to have many advantages, at present in the space and ground have purposes widely, especially higher to vibration and the life requirements of sterlin refrigerator in imaging systems such as the space is infrared, usually its index of aging has been reached the several years.As shown in Figure 1, sterlin refrigerator comprises compressor, decompressor, middle connection pipe, compressor produces periodically variable pressure wave during work, be transferred in the decompressor via centre connection pipe, the regenerator that promotes in the decompressor periodically moves back and forth, and produces refrigerating capacity in the isothermal expansion process of Working medium gas motion in cold chamber in the chamber.Motion phase between pressure wave and the regenerator is the parameter of comparison key.Generally the driving of regenerator utilizes motor, supports and adopt cylindrical spring to support, and the phase adjusted of regenerator is utilized drive motors, spring rate etc., and structure is complicated, and life-span and vibration index are brought adverse effect, influences the use of refrigeration machine.
Summary of the invention
The purpose of this invention is to provide a kind of free-piston decompressor, realized that sterlin refrigerator does not have the clearance seal of wearing and tearing, the driving of no motor pure gas, flexible board spring support technology, guaranteed that highly reliable, the low vibration when regenerator is worked in the decompressor is exported.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of free-piston decompressor, described decompressor comprises: flat spring, clearance seal seat, regenerator, cold finger, cooling cylinder, drive rod, end cap, connection pipe and ancillary equipment compressor;
Wherein cooling cylinder and cold finger are the column type cavity body structure, the diameter of cold finger is 1/5～1/3 of cooling cylinder, cooling cylinder and cold finger are structure as a whole, cooling cylinder one end is fixedlyed connected with cold finger one end and inner chamber communicates, the cooling cylinder other end is welded with end cap, and cooling cylinder and end cap form back pressure cavity, place one or more flat spring along the cooling cylinder y direction in back pressure cavity, flat spring center drilling, two ends are fixed on the cooling cylinder;
Regenerator is positioned at cold finger, and the other end of cold finger and regenerator rear end form cold chamber; Be filled with metal wire knitted square hole net in the regenerator, have one or more through holes at the regenerator front end, through hole and metal wire knitted square hole net UNICOM have one or more through holes in the regenerator rear end, and through hole makes metal wire knitted square hole net and cold chamber UNICOM;
The regenerator front end is provided with drive rod, and the through hole on regenerator top is arranged around the drive rod, and drive rod stretches into back pressure cavity, passes the flat spring center and is connected with the flat spring center, fixedlys connected with last flat spring in the drive rod top;
The clearance seal seat is positioned at the connection position of cooling cylinder and cold finger inner chamber, and clearance seal seat and regenerator front end form the room temperature chamber, and the clearance seal seat is provided with the inclined-plane towards an end of regenerator;
Have through hole on the cooling cylinder inwall of top, room temperature chamber, the connection pipe is arranged in through hole, and connection Guan Yiduan exposes the cooling cylinder outer wall and is connected with compressor, and the other end communicates with the room temperature chamber; The inclined-plane of clearance seal seat one end and the contact position of drive rod be positioned at connection pipe lower end under;
Wherein, clearance seal seat edge and cooling cylinder inwall closely cooperate, and the edge of regenerator and cold finger inwall are slidingly matched; Flat spring is along the flexible scope of activities sum of the cooling cylinder axis scope of activities greater than regenerator;
The specification of preferable alloy silk weaving square hole pattern is 200～500 per square inch;
Preferably on the plane of regenerator and drive rod junction, and the through-hole aperture that the other end of regenerator is provided with is 0.5～1.5mm,
The quantity of preferred flat spring is 1～3;
Preferred flat spring and woven wire material are stainless steel, and the material of clearance seal seat, regenerator outer wall, cold finger, cooling cylinder, drive rod, end cap and connection pipe is stainless steel or titanium alloy.
The preferred gap seal receptacle is provided with towards an end of regenerator and becomes 30～60 ° inclined-plane, i.e. guiding gutter with horizontal plane;
The cold finger of at first regenerator being packed into during assembling is in the cooling cylinder of then clearance seal seat, flat spring being packed into; Between regenerator and the cold finger, the slit between flat spring, clearance seal seat and the drive rod is micron order.
During the work of described free-piston decompressor, heat load is fixed on the cold finger, the connection pipe is connected with compressor, and compressor produces pressure wave, enters the space that clearance seal seat and regenerator one end seal, i.e. room temperature chamber by joining pipe; Owing to be carved with guiding gutter on the clearance seal seat, the air-flow that transmits from compressor can enter into the room temperature chamber uniformly by the connection pipe, thereby has avoided the impact of air-flow to drive rod, promotes regenerator and moves back and forth.The gas that is sealed between cold finger and the regenerator expands, and temperature reduces the realization refrigeration.
Wherein the precision positioning of regenerator support is that backup plate spring and clearance seal seat are realized, the sealing of Working medium gas is the minim gap by regenerator and cooling cylinder, and clearance seal seat and the realization of cooling cylinder precision-fit, the motion of regenerator and phase adjusted drive by the compressor pressure wave.
Beneficial effect
The present invention's advantage compared with prior art is: the characteristics that the axial rigidity by flat spring is little, radial rigidity is big and the precision-fit between the parts, position eccentric degree when having reduced regenerator and in decompressor, moving, wearing and tearing when having reduced its operation, thereby the long-life that can guarantee the refrigeration machine decompressor; The compressor pressure ripple evenly is delivered in the decompressor room temperature chamber by the ramp structure of clearance seal seat, thereby effectively reduces refrigeration machine when work pressure wave to the impact of regenerator, the vibration when reducing refrigeration machine work.In cooling cylinder, do not have drive motors, reduced energy consumption.
Description of drawings
Fig. 1 is the structural representation of sterlin refrigerator;
Fig. 2 is the axial cross section schematic diagram of free-piston decompressor of the present invention;
Wherein, 1-flat spring, 2-clearance seal seat, 3-regenerator, 4-cold finger, 5-cooling cylinder, 6-drive rod, 7-end cap, 8-join pipe.
The specific embodiment
Embodiment
A kind of free-piston decompressor as shown in Figure 2, described decompressor comprises: flat spring 1, clearance seal seat 2, regenerator 3, cold finger 4, cooling cylinder 5, drive rod 6, end cap 7, connection pipe 8 and ancillary equipment compressor;
Wherein cooling cylinder 5 and cold finger 4 are the column type cavity body structure, the diameter of cold finger 4 is 1/5～1/3 of cooling cylinder 5, cooling cylinder 5 and cold finger 4 are structure as a whole, cooling cylinder 5 one ends are fixedlyed connected with cold finger 4 one ends and inner chamber communicates, cooling cylinder 5 other ends are welded with end cap 7, and cooling cylinder 5 and end cap form back pressure cavity, place one or more flat spring 1 along cooling cylinder 5 y directions in back pressure cavity, flat spring 1 center drilling, two ends are fixed on the cooling cylinder 5;
Have through hole on cooling cylinder 5 inwalls of top, room temperature chamber, connection pipe 8 is arranged in through hole, and connection pipe 8 one ends expose cooling cylinder 5 outer walls and are connected with compressor, and the other end communicates with the room temperature chamber; The inclined-plane of clearance seal seat 2 one ends and the contact position of drive rod 6 be positioned at connection pipe 8 lower ends under;
Wherein, clearance seal seat 2 edges and cooling cylinder 5 inwalls closely cooperate, and the edge of regenerator 3 and cold finger 4 inwalls are slidingly matched; Flat spring 1 is along the flexible scope of activities sum of the cooling cylinder axis scope of activities greater than regenerator;
The specification of preferable alloy silk weaving square hole pattern is 200～500 per square inch;
Preferably on the plane of regenerator 3 and drive rod 6 junctions, and the through-hole aperture that the other end of regenerator 3 is provided with is 0.5～1.5mm,
The quantity of preferred flat spring 1 is 1～3;
Preferred flat spring 1 and woven wire material are stainless steel, and the material of clearance seal seat 2, regenerator 3 outer walls, cold finger 4, cooling cylinder 5, drive rod 6, end cap 7 and connection pipe 8 is stainless steel or titanium alloy.
Preferred gap seal receptacle 2 is provided with towards an end of regenerator 3 and becomes 30～60 ° inclined-plane, i.e. guiding gutter with horizontal plane;
The cold finger of at first regenerator being packed into during assembling is in the cooling cylinder of then clearance seal seat, flat spring being packed into; Between regenerator 3 and the cold finger 4, the slit between flat spring 1, clearance seal seat 2 and the drive rod 6 is micron order.
During the work of described free-piston decompressor, heat load is fixed on the cold finger 4, connection pipe 8 is connected with compressor, and compressor produces periodically variable pressure wave, manages 8 and enters clearance seal seat 2 and room temperature chamber by joining; Owing to be carved with guiding gutter on the clearance seal seat 2, the air-flow that transmits from compressor can enter into the room temperature chamber uniformly by connection pipe 8, thereby has avoided the impact of air-flow to drive rod 6, promotes regenerator 3 and periodically moves back and forth back and forth.In the chamber, in cold chamber, produce refrigerating capacity in the isothermal expansion process of Working medium gas motion, when the electrical power generation 1W of input 30W cold.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. free-piston decompressor,, it is characterized in that: described decompressor comprises: flat spring (1), clearance seal seat (2), regenerator (3), cold finger (4), cooling cylinder (5), drive rod (6), end cap (7), connection pipe (8) and ancillary equipment compressor;
Wherein cooling cylinder (5) and cold finger (4) are the column type cavity body structure, the diameter of cold finger (4) is 1/5～1/3 of cooling cylinder (5), cooling cylinder (5) and cold finger (4) are structure as a whole, cooling cylinder (5) one ends are fixedlyed connected with cold finger (4) one ends and inner chamber communicates, cooling cylinder (5) other end is welded with end cap (7), cooling cylinder (5) and end cap form back pressure cavity, in back pressure cavity, place one or more flat spring (1) along cooling cylinder (5) y direction, flat spring (1) center drilling, two ends are fixed on the cooling cylinder (5);
Regenerator (3) is positioned at cold finger (4), and the other end of cold finger (4) and regenerator (3) rear end form cold chamber; Be filled with metal wire knitted square hole net in the regenerator (3), have one or more through holes at regenerator (3) front end, through hole and metal wire knitted square hole net UNICOM have one or more through holes in regenerator (3) rear end, and through hole makes metal wire knitted square hole net and cold chamber UNICOM;
Regenerator (3) front end is provided with drive rod (6), the through hole of regenerator (3) front end is arranged around drive rod (6) on the plane of regenerator (3) and drive rod (6) junction, drive rod (6) stretches into back pressure cavity, passing flat spring (1) center and be connected with flat spring (1) center, fixedlys connected with last flat spring in drive rod (6) top;
Clearance seal seat (2) is positioned at the connection position of cooling cylinder (5) and cold finger (4) inner chamber, and clearance seal seat (2) and regenerator (3) front end form the room temperature chamber, and clearance seal seat (2) is provided with the inclined-plane towards an end of regenerator (3);
Have through hole on cooling cylinder (5) inwall of top, room temperature chamber, connection pipe (8) is arranged in through hole, and connection pipe (8) one ends expose cooling cylinder (5) outer wall and are connected with compressor, and the other end communicates with the room temperature chamber; The contact position of the inclined-plane of clearance seal seat (2) one ends and drive rod (6) be positioned at connection pipe (8) lower end under;
Wherein, clearance seal seat (2) edge and cooling cylinder (5) inwall closely cooperate, and the edge of regenerator (3) and cold finger (4) inwall are slidingly matched; Flat spring (1) is along the flexible scope of activities sum of the cooling cylinder axis scope of activities greater than regenerator.
2. a kind of free-piston decompressor according to claim 1, it is characterized in that: the specification of metal wire knitted square hole net is 200～500 per square inch.
3. a kind of free-piston decompressor according to claim 1, it is characterized in that: on the plane of regenerator (3) and drive rod (6) junction, and the through-hole aperture that the other end of regenerator (3) is provided with is 0.5～1.5mm.
4. a kind of free-piston decompressor according to claim 1, it is characterized in that: the quantity of flat spring (1) is 1～3.
5. a kind of free-piston decompressor according to claim 1, it is characterized in that: flat spring (1) and metal wire knitted square hole net materials are stainless steel, and the material of clearance seal seat (2), regenerator (3) outer wall, cold finger (4), cooling cylinder (5), drive rod (6), end cap (7) and connection pipe (8) is stainless steel or titanium alloy.
6. a kind of free-piston decompressor according to claim 1 is characterized in that: clearance seal seat (2) is provided with towards an end of regenerator (3) and becomes 30～60 ° inclined-plane with horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110401498 CN102519178B (en) | 2011-12-06 | 2011-12-06 | Free piston expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110401498 CN102519178B (en) | 2011-12-06 | 2011-12-06 | Free piston expander |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102519178A CN102519178A (en) | 2012-06-27 |
| CN102519178B true CN102519178B (en) | 2013-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110401498 Active CN102519178B (en) | 2011-12-06 | 2011-12-06 | Free piston expander |
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| CN (1) | CN102519178B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437908A (en) * | 2012-08-01 | 2013-12-11 | 摩尔动力(北京)技术股份有限公司 | Engine with deep compression unit |
| CN103644295B (en) * | 2013-12-15 | 2015-11-18 | 中国科学院工程热物理研究所 | A kind of piston system of single valve decompressor |
| CN105546006B (en) * | 2015-12-21 | 2017-10-10 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of flat spring structure for linear electric motors |
| CN106568222B (en) * | 2016-10-28 | 2020-02-14 | 同济大学 | Pulse tube refrigerator |
| CN106679218B (en) * | 2016-12-23 | 2019-04-05 | 兰州空间技术物理研究所 | A kind of twin-stage sterlin refrigerator expander |
| CN108167163A (en) * | 2018-02-22 | 2018-06-15 | 方舟 | A kind of expansion piston device for acoustic energy refrigeration machine |
| CN112539569B (en) * | 2019-09-21 | 2022-07-12 | 昆明物理研究所 | Cold head heat exchange device of low-temperature refrigerator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004205088A (en) * | 2002-12-25 | 2004-07-22 | Sumitomo Heavy Ind Ltd | Regenerative refrigerator |
| CN1523309A (en) * | 2003-09-05 | 2004-08-25 | 中国科学院上海技术物理研究所 | Phase modulator of air-operated separately mounted Stirling's refrigerator |
| CN1959298A (en) * | 2006-11-24 | 2007-05-09 | 中国科学院上海技术物理研究所 | Stirling refrigerating machine being as cold source of low temperature refrigerator |
| JP2007255734A (en) * | 2006-03-20 | 2007-10-04 | Sumitomo Heavy Ind Ltd | Cold head |
-
2011
- 2011-12-06 CN CN 201110401498 patent/CN102519178B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004205088A (en) * | 2002-12-25 | 2004-07-22 | Sumitomo Heavy Ind Ltd | Regenerative refrigerator |
| CN1523309A (en) * | 2003-09-05 | 2004-08-25 | 中国科学院上海技术物理研究所 | Phase modulator of air-operated separately mounted Stirling's refrigerator |
| JP2007255734A (en) * | 2006-03-20 | 2007-10-04 | Sumitomo Heavy Ind Ltd | Cold head |
| CN1959298A (en) * | 2006-11-24 | 2007-05-09 | 中国科学院上海技术物理研究所 | Stirling refrigerating machine being as cold source of low temperature refrigerator |
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| CN102519178A (en) | 2012-06-27 |
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Inventor after: Wang Xiaojun Inventor after: Xu Guotai Inventor after: Yan Chunjie Inventor after: Wang Tiangang Inventor after: Huo Yingjie Inventor after: Sun Shuze Inventor before: Xu Guotai Inventor before: Yan Chunjie Inventor before: Wang Tiangang Inventor before: Huo Yingjie Inventor before: Wang Xiaojun Inventor before: Sun Shuze |
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