CN106050612B - Ultra-low temperature refrigerating device non-contacting seal piston - Google Patents
Ultra-low temperature refrigerating device non-contacting seal piston Download PDFInfo
- Publication number
- CN106050612B CN106050612B CN201610499856.7A CN201610499856A CN106050612B CN 106050612 B CN106050612 B CN 106050612B CN 201610499856 A CN201610499856 A CN 201610499856A CN 106050612 B CN106050612 B CN 106050612B
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- Prior art keywords
- piston
- matrix
- ultra
- low temperature
- refrigerating device
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Compressor (AREA)
Abstract
The invention discloses a kind of ultra-low temperature refrigerating device non-contacting seal piston, positioned at cylinder interior, in cylindrical structure, it includes cylindrical piston matrix and the wear-resistant coating coated on piston outer surface of matrix, wherein, the wear-resistant coating is the drum of tape thickness, and its outer round surface is provided with some grooves, and its internal circular surfaces is in the smooth cylinder to match with piston matrix profile.Present invention, avoiding the processing to piston matrix, reduces the stress variation in temperature-fall period, ensures cylindricity of the piston matrix under low-temperature condition, ensures overall sealing property with this.
Description
Technical field
The present invention relates to refrigeration typed low-temperature pump technical field, more particularly to a kind of adsorption box for cryogenic pump.This hair
It is bright to be related to piston sealing device technical field, and in particular to a kind of ultra-low temperature refrigerating device non-contacting seal piston.
Background technology
In recent years, with large-scale low-temperature vavuum pump, high/low temperature superconductive device, NMR imaging instrument (MRI), infrared acquisition
Device, low temperature optoelectronics device develop rapidly, and the industrial requirement of ultra-low temperature refrigerating device also constantly increasing, and develop ultralow temperature system
Cold has become an important research direction in cryogenic technique field.Traditional sealing structure, added outside piston
One piston type sealing ring, sealing ring are in close contact with cylinder inner wall, to reach the purpose of its sealing.This piston seal ring type
Following many shortcomings be present in sealing structure:It is that abrasion between this piston type sealing ring and cylinder causes its short life first,
And with the passage of working time, the aggravation of seal wears can increase the quantity of gas leakage of refrigeration machine, and cause refrigeration machine
The increase of cold damage, so this piston type sealing ring needs often to change, more rering can influence refrigeration machine cooling performance again
Stabilization；It is to work at low temperature additionally, due to this piston type sealing ring, it is endless hermetically sealed caused by the shrinkage of piston ring
It is unavoidable, it can so inevitably result in the decline of piston refrigerator refrigerating capacity and the fluctuation of cryogenic temperature.
Found through being retrieved to relevant technical literature, Chinese invention patent《Labyrinth seal piston for G-M refrigeration machines》
(publication number：101949378A；Publication date：On January 19th, 2011) in provide a kind of piston, the piston is located inside cylinder 5,
It includes piston matrix 1 and wear-resistant coating 3, by the direct car system in the surface of piston matrix 1 perpendicular to the recessed of the axis of piston matrix 1
Groove 2 simultaneously forms labyrinth seal structure, then one layer of wear-resistant coating 3 of its surface spraying again；The material of wear-resistant coating 3 is polytetrafluoroethyl-ne
Alkene.As shown in figure 1, the problem of structure is present：The direct car groove 2 in the surface of piston matrix 1 causes the intensity of the groove
It is weaker than the other parts of piston matrix 1, due to the presence of stress, the radial stress of piston matrix 1 at low temperature can remain in recessed
At groove 2, cause to deform at groove 2, and then decline the axiality of piston matrix 1, the problem of piston scratches cylinder occur.Meanwhile
The direct car groove 2 in the surface of piston matrix 1 can destroy the bulk strength of piston matrix 1, cause piston matrix 1 to become under stress
Shape, its cylindricity is influenceed, and then influence overall sealing property.
Chinese utility model patent《Piston type cold-storage sealing structure for piston-type cryogenic refrigeration machine》(publication number：
2367799；Publication date：On March 8th, 2000) in provide a kind of piston, the piston by piston jacket and positioned at piston jacket it
In piston liner of the inside equipped with cold-storage filler form, be carved with groove on outer surface of piston, form the form of labyrinth seal；It is recessed
Cool storage material is housed in groove and piston liner.This sealing structure is complex, makes the processing of piston and assembly difficulty higher.Separately
Outside, piston jacket is different from the material of piston liner, and the piston that same material is not formed produces gap because shrinkage factor is different,
At low temperature especially under the ultralow temperature of liquid helium region, cause labyrinth seal clearance as temperature reduces and constantly increase, so as to
It has impact on the overall sealing performance of labyrinth piston at low temperature.
The content of the invention
The present invention makes improvements for existing technical problem, i.e., the technical problems to be solved by the invention are to provide one kind
Ultra-low temperature refrigerating device non-contacting seal piston, groove is set on the wear-resistant coating of piston outer surface of matrix, is avoided pair
The processing of piston matrix, the stress variation in temperature-fall period is reduced, ensure cylindricity of the piston matrix under low-temperature condition, with
This ensures overall sealing property.To solve the above problems, technical scheme provided by the invention is：
A kind of ultra-low temperature refrigerating device non-contacting seal piston, positioned at cylinder interior, in cylindrical structure, it includes circle
Cylinder-piston matrix and the wear-resistant coating coated on piston outer surface of matrix, wherein, the wear-resistant coating is the cylinder of tape thickness
Shape, its outer round surface are provided with some grooves, and its internal circular surfaces is in the smooth cylinder to match with piston matrix profile.
Further, for the depth of groove in the range of 0.5-0.7mm, the maximum gauge and groove of the wear-resistant coating are deep
The difference of degree is less than 0.05mm.
Further, the groove molded line is spiral shape or annular, and the channel section is shaped as polygon.
Further, the piston matrix material and cylinder material are stainless steel.
In the above-mentioned technical solutions, piston outer surface of matrix is provided with wear-resistant coating, is set in the outer round surface of the wear-resistant coating
It is fluted, the processing to piston matrix is avoided, reduces the stress variation in temperature-fall period, ensures piston matrix in low temperature shape
Cylindricity under state, ensure overall sealing property with this.In addition, this structure setting can also ensure the coaxial of piston matrix
Degree, avoid piston scratch cylinder the problem of.Further, the thickness to wear-resistant coating and the parameter value of depth of groove are optimized and set
Put.Further, it is spiral shape or annular for the ease of the understanding directly perceived to groove, groove molded line, channel section is shaped as more
Side shape.Further, setting is optimized to the parameter value of seal clearance.Further, in order to ensure that seal clearance will not be by temperature
The influence reduced is spent, piston matrix material is identical with cylinder material, further ensures the sealing between piston and cylinder.
The invention solves another technical problem, reduce piston matrix processing and assembly difficulty.
Further, the piston matrix both ends are provided with screw plug.
In the technical scheme, by piston matrix both ends using screw plug seal, reduce piston matrix processing and
Assembly difficulty.
The invention solves another technical problem, there is provided one kind be directed to the first above-mentioned technical scheme or second of skill
The ultra-low temperature refrigerating device manufacture method of non-contacting seal piston described in art scheme, comprises the following steps：
Step 1：In piston outer surface of matrix spraying of wearable coating；
Step 2：In the wear-resistant coating outer surface and along piston circumference car groove, the depth of groove is no more than wear-resisting
The thickness of coating.
Further, the piston matrix described in step 1 is processed and formed at one time to obtain by lathe.
Further, in addition to step 3：Screw thread is carried out in the piston matrix both ends machining internal thread, and with screw plug
It is tightly connected.
In the above-mentioned technical solutions, first spraying of wearable coating, the processing part for ensureing the later stage are to enter to sprayed surface
OK, the processing to piston matrix is avoided, reduces the stress variation in temperature-fall period, ensures piston matrix under low-temperature condition
Cylindricity.Further, the piston matrix described in step 1 is processed and formed at one time to obtain by lathe.It is processed and formed at one time
The step of avoiding multiple bearing, clamping in process, the accuracy of form and position has obtained fine guarantee after making the processing of piston matrix.
The device have the advantages that：
The present invention ensures cylindricity of the piston matrix under low-temperature condition, ensures overall sealing property with this；Can be with
Ensure piston axiality, avoid piston scratch cylinder the problem of.
By the selection of material, ensure that seal clearance will not be reduced by temperature is influenceed the present invention, is further ensured
Sealing between piston and cylinder, i.e. labyrinth seal clearance will not expand as temperature reduces.
Piston matrix both ends of the present invention are sealed using screw plug, and processing and the assembling for reducing piston matrix are difficult
Degree.
The present invention optimizes setting to the thickness of wear-resistant coating and the parameter value of depth of groove.If wear-resistant coating is too thin,
Refrigeration machine can then be caused after long-play, the piston face serious wear in refrigeration machine, influence refrigeration machine performance and
Life-span.Groove is too shallow, then sealing effectiveness can be caused poor.
The accuracy of form and position of piston matrix of the present invention after processing has obtained fine guarantee.
Brief description of the drawings
Fig. 1 is prior art construction schematic diagram.
Fig. 2 is enlarged diagram at A in the prior art.
Fig. 3 is the first embodiment structural representation.
Fig. 4 is enlarged diagram at B in the first embodiment.
Embodiment
In order to be better understood from the present invention relative to the improvement made by prior art, in the specific embodiment party to the present invention
Before formula is described in detail, the prior art combination accompanying drawing first mentioned to background technology is illustrated.
Fig. 1 show the Chinese invention patent that prior art is mentioned《Labyrinth seal piston for G-M refrigeration machines》In
Piston structure, the piston is located inside cylinder 5, in the direct car system in the surface of piston matrix 1 perpendicular to the recessed of the axis of piston matrix 1
Groove 2, then one layer of wear-resistant coating 3 of its surface spraying again.For the ease of comparing, to being amplified in Fig. 1 at the A with fluted 2
Obtain Fig. 2.Observe Fig. 2 and understand that groove 2 is directly processed on piston matrix 1, can so make the overall strong of piston matrix 1
Degree weakens, and the intensity distribution of each several part of piston matrix 1 is uneven, influences its cylindricity, and then influence overall sealing
Energy.Piston coaxial degree is can also affect on, the problem of piston scratches cylinder occurs.
With reference to embodiment and accompanying drawing, the present invention will be further described.
As shown in figure 3, the specific kind embodiment of the present invention, a kind of ultra-low temperature refrigerating device non-contacting seal piston,
It is described
Piston is located inside cylinder 5, and in cylindrical structure, it includes the piston matrix 1 in cylinder, is arranged on piston base
The wear-resistant coating 3 and screw plug 4 of the outer surface of body 1, wherein wear-resistant coating 3 are the drum of tape thickness, and its outer round surface is set
There are some grooves 2, its internal circular surfaces is in the smooth cylinder to match with piston matrix profile.
The first step, make piston matrix 1.The piston matrix 1 is processed and formed at one time to obtain by lathe, its material
It is identical with the material of cylinder 5, it is stainless steel material.
Second step, make wear-resistant coating 3.In the above-mentioned surface spraying wear-resistant coating 3 of piston matrix 1, the thickness of the wear-resistant coating
Spend in the range of 0.5-0.75mm, to ensure the progress in next step.
3rd step, make groove 2.The outer surface of wear-resistant coating 3 and along piston circumference car depth be 0.5-
Groove 2 in the range of 0.7mm, the molded line of groove 2 is annular, and its cross sectional shape is rectangle.
Final step, complete piston and make.In the both ends machining internal thread of piston matrix 1, and carried out with screw plug 4
Thread seal connects.
Inside the installing piston into cylinder 5 of completion, the conduit spine of its further groove 2 and the gap of the inwall radius of cylinder 5 are that is, close
Gap is sealed in the range of 0.02-0.05mm.
Fig. 4 show the figure after being amplified in Fig. 3 at the B with fluted 2.Comparison diagram 2 and Fig. 4, can be more directly perceived
Understanding the present invention improvements, in conjunction with the setting of parameter, draw beneficial effects of the present invention.
Labyrinth seal structure is formed by groove 2 in above-mentioned embodiment.The principle of labyrinth seal, in gas from high-pressure side
Throttling narrow slit i.e. seal clearance is flowed through with high flow velocity, enters back into groove 2 and is expanded, it is narrow through throttling to consume gas stream
Slit into speed energy, so by repeatedly throttling and expansion produce resistance, prevent gas leak out, so as to reaching sealing
Purpose.In order to ensure that the intensity of piston matrix 1 is not damaged, first spraying of wearable coating 3, the processing for ensureing later stage groove 2 be
Apply wear-resistant coating 3 to carry out, avoid the processing to piston matrix 1, reduce the stress variation in temperature-fall period, ensure piston base
Cylindricity of the body 1 under low-temperature condition.On this basis, the thickness of wear-resistant coating 3 be 0.5-0.75mm in the range of, groove 2
Depth is in the range of 0.5-0.7mm.Ensure that the thickness of wear-resistant coating is enough, allow the piston normal work in cylinder 5 for a long time
Make, piston face will not serious wear.The depth of groove 2 is enough simultaneously, ensures gas enough speed of consumption in groove 2
Can, realize good sealing effectiveness.
The characteristics of present embodiment：
1. present embodiment ensures piston 1 cylindricity under low-temperature condition of matrix, ensure overall sealing property with this；
The axiality of piston can also be ensured, avoid piston scratch cylinder 5 the problem of.
2. present embodiment ensures what seal clearance will not be reduced by temperature by the selection to the material of piston matrix 1
Influence, further ensure the sealing between piston and cylinder 5, be i.e. labyrinth seal clearance will not expand as temperature reduces
Greatly.
3. the both ends of piston matrix 1 described in present embodiment are sealed using screw plug 4, the processing of piston matrix 1 is reduced
And assembly difficulty.
4. present embodiment optimizes setting to the thickness of wear-resistant coating 3 and the parameter value of the depth of groove 2.
5. the accuracy of form and position of piston matrix 1 after processing described in present embodiment has obtained fine guarantee.
Above-mentioned all embodiments are only used for the principle for illustrating the present invention, are not limited to the scope of the present invention.To this hair
It is bright to make other changes, such as the molded line or cross sectional shape of groove 2.These changes still fall the protection in the present invention
In the range of.
Claims (8)
- A kind of 1. ultra-low temperature refrigerating device non-contacting seal piston, positioned at cylinder（5）Inside, in cylindrical structure, it includes Cylindrical piston matrix（1）With coated on piston matrix（1）The wear-resistant coating of outer surface（3）, it is characterised in that the wear-resisting painting Layer（3）For the drum of tape thickness, its outer round surface is provided with some grooves（2）, its internal circular surfaces be in and piston matrix profile The smooth cylinder to match.
- 2. ultra-low temperature refrigerating device as claimed in claim 1 non-contacting seal piston, it is characterised in that the groove（2） Depth is in the range of 0.5-0.7mm, the wear-resistant coating（3）Maximum gauge and groove（2）The difference of depth is less than 0.05mm。
- 3. ultra-low temperature refrigerating device as claimed in claim 1 non-contacting seal piston, it is characterised in that the groove（2） Molded line is spiral shape or annular, the groove（2）Cross sectional shape is polygon.
- 4. ultra-low temperature refrigerating device as claimed in claim 1 non-contacting seal piston, it is characterised in that the piston matrix （1）Material and cylinder（5）Material is stainless steel.
- 5. ultra-low temperature refrigerating device as claimed in claim 1 non-contacting seal piston, it is characterised in that the piston matrix （1）Both ends are provided with screw plug（4）.
- A kind of 6. manufacture method of the ultra-low temperature refrigerating device non-contacting seal piston described in claim 1, it is characterised in that Comprise the following steps：Step 1：In piston matrix（1）Outer surface spraying of wearable coating（3）；Step 2：In the wear-resistant coating（3）Outer surface and along piston circumference car groove（2）, groove（2）Depth be no more than Wear-resistant coating（3）Thickness.
- 7. the ultra-low temperature refrigerating device as claimed in claim 6 manufacture method of non-contacting seal piston, it is characterised in that step Piston matrix described in rapid one（1）It is processed and formed at one time to obtain by lathe.
- 8. the ultra-low temperature refrigerating device as claimed in claim 6 manufacture method of non-contacting seal piston, it is characterised in that also Including step 3：In the piston matrix（1）Both ends machining internal thread, and and screw plug（4）Carry out thread seal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610499856.7A CN106050612B (en) | 2016-06-29 | 2016-06-29 | Ultra-low temperature refrigerating device non-contacting seal piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610499856.7A CN106050612B (en) | 2016-06-29 | 2016-06-29 | Ultra-low temperature refrigerating device non-contacting seal piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106050612A CN106050612A (en) | 2016-10-26 |
| CN106050612B true CN106050612B (en) | 2018-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610499856.7A Expired - Fee Related CN106050612B (en) | 2016-06-29 | 2016-06-29 | Ultra-low temperature refrigerating device non-contacting seal piston |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695715A (en) * | 2019-01-11 | 2019-04-30 | 中国电子科技集团公司第十六研究所 | A kind of piston face structure and its processing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447062A (en) * | 1982-05-21 | 1984-05-08 | Mtu-Motoren-Und-Turbinen-Union Friedrichschafen Gmbh | Sealing arrangement for fluid flow engines |
| JP2890174B2 (en) * | 1995-03-31 | 1999-05-10 | 東京瓦斯株式会社 | Piston for high pressure gas compressor |
| CN201170159Y (en) * | 2007-10-19 | 2008-12-24 | 无锡压缩机股份有限公司 | Stage teeth labyrinth sealing pressure reduction ring for compressor stuffing |
| CN101949378A (en) * | 2010-09-17 | 2011-01-19 | 上海交通大学 | Labyrinth seal piston for G-M refrigerator |
| CN205876652U (en) * | 2016-06-29 | 2017-01-11 | 安徽万瑞冷电科技有限公司 | Super sealed piston of non -contact for cryocooler |
-
2016
- 2016-06-29 CN CN201610499856.7A patent/CN106050612B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447062A (en) * | 1982-05-21 | 1984-05-08 | Mtu-Motoren-Und-Turbinen-Union Friedrichschafen Gmbh | Sealing arrangement for fluid flow engines |
| JP2890174B2 (en) * | 1995-03-31 | 1999-05-10 | 東京瓦斯株式会社 | Piston for high pressure gas compressor |
| CN201170159Y (en) * | 2007-10-19 | 2008-12-24 | 无锡压缩机股份有限公司 | Stage teeth labyrinth sealing pressure reduction ring for compressor stuffing |
| CN101949378A (en) * | 2010-09-17 | 2011-01-19 | 上海交通大学 | Labyrinth seal piston for G-M refrigerator |
| CN205876652U (en) * | 2016-06-29 | 2017-01-11 | 安徽万瑞冷电科技有限公司 | Super sealed piston of non -contact for cryocooler |
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| Publication number | Publication date |
|---|---|
| CN106050612A (en) | 2016-10-26 |
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Denomination of invention: Non-contact packed piston for ultralow-temperature refrigerator Effective date of registration: 20181113 Granted publication date: 20180116 Pledgee: Hefei high tech Company limited by guarantee Pledgor: Vacree Technologies Co., Ltd. Registration number: 2018340000626 |
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