CN102052797B - Integrated end cover structure for pushing piston of heat accumulating type refrigerating machine - Google Patents
Integrated end cover structure for pushing piston of heat accumulating type refrigerating machine Download PDFInfo
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- CN102052797B CN102052797B CN2010105644327A CN201010564432A CN102052797B CN 102052797 B CN102052797 B CN 102052797B CN 2010105644327 A CN2010105644327 A CN 2010105644327A CN 201010564432 A CN201010564432 A CN 201010564432A CN 102052797 B CN102052797 B CN 102052797B
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- end cover
- bottom end
- cold junction
- heat accumulating
- accumulating type
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a cold end cover structure for a pushing piston of a heat accumulating type low-temperature refrigerating machine. The structure comprises an upper end cover and a lower end cover. The structure is characterized in that: the lower end cover is connected with a pushing piston shell together by welding, a central positioning column on the upper end cover is inserted into a positioning hole of the lower end cover for positioning and then welded with the lower end cover to form a whole, and a cold end bush is glued with the lower end cover by using glue. The design of the positioning hole improves the assembly precision of a seal cover, and a lateral air outlet device enhances heat exchange of a working medium and a cold end.
Description
Technical field
The present invention relates to the heat accumulating type Cryo Refrigerator, be specifically related to the cold junction end cover structure of the passing piston of heat accumulating type Cryo Refrigerator, it is used for the sterlin refrigerator or the GM refrigeration machine of heat accumulating type Cryo Refrigerator.
Background technology
The heat accumulating type Cryo Refrigerator is that passing piston and compression piston move according to a phase bit; Working medium realizes refrigeration at the expansion chamber swelling heat absorption; And cold is transferred to cold head through the mode of heat convection, so the heat exchange effect of working medium and cold head has influenced the efficient of refrigeration machine to a great extent.The mode of giving vent to anger that relates among the patent WO2004/003442 is straight-through expansion chamber, and air-flow is diffusion suddenly in expansion chamber, and flow velocity is less, and convection transfer rate is little; Heat exchange area is merely the cold head end face, and heat exchange area is little, and the cold efficiency of transmission descends, and finally causes the refrigeration machine overall efficiency to descend.To this problem, the present invention designs the cold junction end cap that side direction is given vent to anger, and the flow velocity when improving air communication and crossing slit improves convection transfer rate, and makes full use of the cold head sidewall and carry out heat exchange, improves whole heat exchange efficiency.
Summary of the invention
The cold junction end cover structure that the purpose of this invention is to provide a kind of passing piston of heat accumulating type Cryo Refrigerator solves little and the problem that the refrigeration machine overall efficiency is descended of the convection transfer rate that exists in the prior art.
The cold junction end cover structure of the passing piston of a kind of heat accumulating type Cryo Refrigerator of the present invention is shown in accompanying drawing 1, and it is made up of three parts that comprise bottom end cover 1, cold junction lining 3 and upper end cover 4.
Described bottom end cover 1 is the disk of titanium alloy, and the locating hole 101 of location was uniformly distributed with fan-shaped flow-guiding channel 102 around the locating hole 101 when the center had one to be used for upper end cover 3 assemblings, and the flow-guiding channel circulation area is than accounting for 30%～40% of total sectional area; For ease of welding with passing piston shell 2, the disc structure one end car of bottom end cover 1 goes out a step anchor ring, is used to insert the axial location of passing behind the piston shell 2.
Said cold junction lining 3 is the cylindrical sleeve of nylon material, and internal diameter is consistent with said bottom end cover 1 bigger end internal diameter, thickness be 0.15mm to 0.3mm, and form clearance seal with cylinder, the gap is that 0.005mm is to 0.03mm.
Said upper end cover 4 is the cylindrical stage stage structure of a titanium alloy, and matrix 401 external diameters are identical with said bottom end cover 1 bigger end external diameter, do not carry out laser weld so that do not add scolder; Matrix 401 1 ends have a centralized positioning post 402 and an annular boss 403, and it is 8 to 16 that the round vent 404 that is uniformly distributed with, number are arranged on annular boss 403 sidewalls, passage diameter 0.8-1.5mm; Centralized positioning post 402 on the upper end cover 4 is higher than annular boss 403, when assembling, in the center positioning hole 101 that reference column 402 inserts on the bottom end cover 1, plays the effect of radial location; When the end face of the annular boss 403 on the upper end cover 4 assembles with bottom end cover 1 at upper end cover 4, play the axial location effect.
During assembling, regenerator 5 is loaded toward passing in the piston shell 2, bottom end cover 1 a less end is inserted pass in the piston shell 2 then, compress annular table terrace and passing piston shell 2 end faces on the bottom end cover 1, on the contact-making surface excircle, carry out laser weld; Bottom end cover 1 is enclosed within bottom end cover 1 bigger end excircle with cold junction lining 3 after accomplishing welding with passing piston shell 2, fixes through the low temperature glue glued adhesion; Centralized positioning on the upper end cover 4 402 posts are inserted in the center positioning hole 101 on the bottom end cover 1, compress the end face of step anchor ring and bottom end cover 1 of upper end cover 4 after, carry out laser weld at the cylindrical of the two contact-making surface, so far, accomplish the assembling of whole capping.
During refrigeration machine work, pass piston and in cylinder, carry out axially reciprocating, in the compression process; After Working medium gas flows out from regenerator 5; Through the fan-shaped flow-guiding channel 102 of bottom end cover 1, the sidewall passage 404 from the annular boss 403 of upper end cover 4, the slit that flow through upper end cover 4 and cold head form; Flow into expansion chamber, accomplish compression process; In the expansion process, Working medium gas flow through upper end cover 4 and the slit that cold head forms are taken away heat, again through the sidewall passage 404 on the annular boss 403, after the rectification through the flow-guiding channel 102 on the bottom end cover 1, get back in the regenerator 5, accomplish an endothermic process.
Advantage of the present invention:
1, the Working medium gas sidewall slit that upper end cover 4 and cold head form of flowing through, not only heat exchange area increases, and flow velocity also has significantly and improves, and heat exchange efficiency improves;
2, increase the matching design of locating hole 101 and reference column 402, improved the assembly precision of upper end cover 1;
3, the end cap end face does not contain passage, can guarantee that metal fragment and greasy dirt do not get under the prerequisite of regenerator 5, end cap is carried out the turning adjustment pass piston length.
Description of drawings
Fig. 1 is an embodiment of the invention axial section; Wherein cutting plane is through upper end cover 4 sidewall aperture middle sections.
Fig. 2 is embodiment of the invention bottom end cover front view and two upward views; Wherein scheming a is front view, and figure b is the cutaway view of cutting plane through flow-guiding channel, and figure c is the cutaway view of cutting plane through fuisw rib.
Fig. 3 is embodiment of the invention upper end cover partial sectional view and upward view; Wherein scheming a is partial sectional view, and figure b is a upward view.
In the accompanying drawing: bottom end cover 1, passing piston shell 2, upper end cover 3, cold junction lining 4, regenerator 5; Locating hole 101, flow-guiding channel 102, fuisw rib 103, matrix 401, reference column 402, annular boss 403, passage 404.
The specific embodiment
Below in conjunction with accompanying drawing the present invention being implemented detailed example explains: the present invention is being to implement under the prerequisite with technical scheme of the present invention, provided detailed concrete scheme and implementation process, but the present invention is not limited to following embodiment.
Fig. 1 is the cutaway view of the embodiment of the invention, has shown all parts bottom end covers 1 of the present invention, cold junction lining 3 and upper end cover 4 among the figure.
Fig. 2 is the vertical view and the cutaway view of embodiment of the invention bottom end cover 1.Bottom end cover 1 is a titanium alloy material, removes flow-guiding channel 102 through the processing of line cutting mode, and all the other positions process through turning.Bottom end cover 1 thick 3.5mm, tolerance is 0 to+0.05mm; A less end diameter is Ф 14.7mm, and tolerance is 0 to-0.01mm, highly is 0.5mm, and a bigger end diameter is Ф 15mm.The internal diameter of the locating hole 101 on the bottom end cover is Ф 2.5, and tolerance is 0 to+0.01mm, with the axiality of excircle less than Ф 0.01mm.Totally 18 of the flow-guiding channels 102 of bottom end cover 1 are sector structure, and radius is R6.5mm, and angle is 20 °, and form is uniformly distributed with axisymmetricly, and fuisw rib 103 thickness are 0.6mm, and the mode of cutting through line processes.
Fig. 3 is the vertical view of embodiment of the invention cold junction lining 3.Cold junction lining 3 is a nylon material, processes through turning.Cold junction lining 3 thick 2mm; Internal diameter is Ф 15mm, and tolerance is 0 to-0.02mm, and outer surface is not processed as blank spare and put in place; External diameter can be Ф 17mm; After three parts bottom end covers 1 of cold junction end cap, cold junction lining 3 and upper end cover 4 all install, carry out car according to cylinder dimensions and join, guarantee that the gap of cold junction lining and cylinder is that 0.005mm is to 0.03mm.Cold junction lining 3 forms clearance seal with cylinder on the one hand, prevents that Working medium gas from flowing backwards to the hot junction, plays the effect that reduces pumping loss, plays axially directed effect on the other hand, prevents that metal cover and cylinder from rubbing.
Fig. 4 partly cuts open figure and upward view for embodiment of the invention upper end cover 4.Upper end cover 4 is a titanium alloy material, forms through cut.The whole height of upper end cover 4 is 10mm, and the external diameter of matrix 401 is Ф 15mm; Centralized positioning post 402 diameters are Ф 2.5mm; Tolerance is 0 to+0.005mm; The axiality of reference column 402 and matrix 401 is less than Ф 0.01mm; Its end face is 3.5mm to the distance of the end face of annular boss 102, and tolerance is 0 to-0.05mm, does not influence the applying of upper end cover 4 annular end faces and bottom end cover 1 end face with the height that guarantees reference column; Annular boss 302 internal diameters are Ф 13mm, are higher than matrix 2mm, and sidewall has 16 passages that are uniformly distributed with 404, and the center, hole is 1mm to the distance of annular end face, aperture Ф 1mm.
During assembling, after regenerator 5 is loaded well in passing piston shell 2, earlier bottom end cover 1 a less end is inserted in the passing piston shell 2, compress bottom end cover 1 annular table terrace and passing piston shell 2 end faces, on the contact-making surface excircle, carry out laser weld; Bottom end cover 1 is enclosed within cold junction lining 3 on the cylindrical of bottom end cover 1 after accomplishing welding with passing piston shell 2, and through the low temperature glue glued adhesion, normal temperature held 2 to 3 days was toasted 4 hours with 80 ℃ in baking oven again, made the low temperature adhesive curing; Upper end cover 4 centralized positioning posts 402 are inserted in bottom end cover 1 center positioning hole 101; Compress the step anchor ring of upper end cover 4 and the end face of bottom end cover 1; Cylindrical at the two contact-making surface carries out laser weld, after three parts of cold junction end cap all install, the cold junction lining is carried out car join; For the cylinder of Ф 15.3mm, the external diameter of cold junction lining 3 can be Ф 15.26mm.
Claims (3)
1. one kind is used for the monoblock type end cap structure that the heat accumulating type refrigeration machine is passed piston, and it is made up of bottom end cover (1), cold junction lining (3) and upper end cover (4), it is characterized in that:
Described bottom end cover (1) is the disk of titanium alloy; The locating hole (101) of location when the center has one to be used for upper end cover (3) assembling; Locating hole (101) is uniformly distributed with fan-shaped flow-guiding channel (102) all around, and the disc structure one end car of bottom end cover (1) goes out a step anchor ring and is used for inserting the axial location when passing piston shell (2);
Described cold junction lining (3) is the cylindrical sleeve of nylon material, and internal diameter is consistent with the bigger end internal diameter of said bottom end cover (1), and thickness is that 0.15mm is to 0.3mm;
Described upper end cover (4) is the cylindrical stage stage structure of a titanium alloy; Matrix (401) external diameter is identical with the bigger end external diameter of said bottom end cover (1); Matrix (401) one ends have the centralized positioning post (402) used do radial location in the center positioning hole (101) that can insert on the bottom end cover (1) and one and make the annular boss (403) of axial location with usefulness during bottom end cover (1) assembling, are evenly equipped with 8 to 16 round vents (404) that diameter is 0.8-1.5mm on annular boss (403) sidewall;
During installation, the less end of bottom end cover (1) inserts to be passed in the piston shell (2), compresses annular table terrace and passing piston shell (2) end face on the bottom end cover (1), on the contact-making surface excircle, carries out laser weld; Bottom end cover (1) is enclosed within the bigger end excircle of bottom end cover (1) with cold junction lining (3) after accomplishing welding with passing piston shell (2), fixes through the low temperature glue glued adhesion; Centralized positioning post (402) on the upper end cover (4) is inserted in the center positioning hole (101) on the bottom end cover (1), compress the end face of step anchor ring and bottom end cover (1) of upper end cover (4) after, carry out laser weld at the cylindrical of the two contact-making surface.
2. a kind of monoblock type end cap structure that the heat accumulating type refrigeration machine is passed piston that is used for according to claim 1, it is characterized in that: the flow-guiding channel circulation area of the fan-shaped flow-guiding channel (102) that locating hole (101) is uniformly distributed with all around in the described bottom end cover (1) accounts for 30%～40% of total sectional area.
3. a kind of monoblock type end cap structure that the heat accumulating type refrigeration machine is passed piston that is used for according to claim 1, it is characterized in that: described cold junction lining (3) forms clearance seal with cylinder, and the gap is that 0.005mm is to 0.03mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105644327A CN102052797B (en) | 2010-11-26 | 2010-11-26 | Integrated end cover structure for pushing piston of heat accumulating type refrigerating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105644327A CN102052797B (en) | 2010-11-26 | 2010-11-26 | Integrated end cover structure for pushing piston of heat accumulating type refrigerating machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102052797A CN102052797A (en) | 2011-05-11 |
| CN102052797B true CN102052797B (en) | 2012-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105644327A Expired - Fee Related CN102052797B (en) | 2010-11-26 | 2010-11-26 | Integrated end cover structure for pushing piston of heat accumulating type refrigerating machine |
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| Country | Link |
|---|---|
| CN (1) | CN102052797B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648551A (en) * | 2004-01-29 | 2005-08-03 | Lg电子株式会社 | Stirling cooler and heat exchanger thereof |
| 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 |
| CN101067523A (en) * | 2007-06-04 | 2007-11-07 | 中国科学院上海技术物理研究所 | Integrated cold head used for co-axial pulse tube refrigerator |
| CN101298948A (en) * | 2008-06-26 | 2008-11-05 | 上海交通大学 | Screw thread welding integral narrow slit type cold junction for coaxial pulse-tube refrigerator |
| CN101469919A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Cool end heat exchanger of pulse tube refrigerator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100393792B1 (en) * | 2001-02-17 | 2003-08-02 | 엘지전자 주식회사 | Pulstube refrigerator |
| JP2003287302A (en) * | 2002-03-27 | 2003-10-10 | Sumitomo Heavy Ind Ltd | Piston head structure of drive compressor in refrigerator |
| US7377035B2 (en) * | 2004-04-23 | 2008-05-27 | Fursystems Inc. | Refrigeration device with improved DC motor |
-
2010
- 2010-11-26 CN CN2010105644327A patent/CN102052797B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648551A (en) * | 2004-01-29 | 2005-08-03 | Lg电子株式会社 | Stirling cooler and heat exchanger thereof |
| 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 |
| CN101067523A (en) * | 2007-06-04 | 2007-11-07 | 中国科学院上海技术物理研究所 | Integrated cold head used for co-axial pulse tube refrigerator |
| CN101469919A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Cool end heat exchanger of pulse tube refrigerator |
| CN101298948A (en) * | 2008-06-26 | 2008-11-05 | 上海交通大学 | Screw thread welding integral narrow slit type cold junction for coaxial pulse-tube refrigerator |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2003-287302A 2003.10.10 |
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| CN102052797A (en) | 2011-05-11 |
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