CN219932381U - Porous throttling air-float piston and cylinder - Google Patents
Porous throttling air-float piston and cylinder Download PDFInfo
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- CN219932381U CN219932381U CN202320982688.2U CN202320982688U CN219932381U CN 219932381 U CN219932381 U CN 219932381U CN 202320982688 U CN202320982688 U CN 202320982688U CN 219932381 U CN219932381 U CN 219932381U
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- piston
- main body
- air
- porous
- check valve
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- 238000005245 sintering Methods 0.000 claims abstract description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000010935 stainless steel Substances 0.000 claims abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 7
- 238000009423 ventilation Methods 0.000 claims description 24
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
Abstract
The utility model discloses a porous throttling air-float piston and cylinder, comprising: the piston comprises a piston main body, wherein an air cavity is arranged in the piston main body, and a plurality of mounting holes are formed in the piston main body; the check valve assembly is arranged at the end part of the piston main body and is used for controlling to close or communicate the air cavity and the outside of the piston main body; the porous throttling assembly comprises an annular piece and a porous medium, wherein the porous medium is a cylinder formed by sintering stainless steel powder, and the fixed aluminum ring is pressed by a tool to deform and press the porous medium. The porous throttling air-float piston and the air cylinder provided by the utility model adopt the porous medium to throttle and filter particle impurities in the air, have simple structure, are convenient to install, can ensure that the resistance of the porous throttling structure on the periphery to working media is approximate under the condition that the sintering process of the porous medium is always stable, ensure that the air buoyancy is the same, reduce the friction between the piston and the air cylinder and prolong the service life of moving parts.
Description
Technical Field
The utility model relates to a gas buoyancy piston, in particular to a porous throttling gas buoyancy piston and a cylinder.
Background
For Stirling refrigerator, the compressor efficiency is greatly influenced by the leakage of gas from the compression cavity to the back air cavity side, so that the gap between the piston and the cylinder is always sealed, the distance between the two structures is very small, in the starting process of the refrigerator, due to the influences of factors such as gravity, structural processing, mechanical vibration and the like, friction exists between the piston and the cylinder to influence the motor efficiency, the abrasion of the cylinder and the increase of structural fragments can greatly influence the refrigerating efficiency, even the phenomenon of piston blocking can be generated, the piston is kept in the middle, the friction between the piston and the cylinder is extremely important, the gas leakage of the compression cavity is reduced by a common air floatation piston structure through a throttling groove, the structural size of the throttling groove is small, the processing difficulty is high, the same of the groove width and the groove depth around is difficult to ensure, the difference of gas buoyancy in all directions is relatively large, and the abrasion of the cylinder and the piston is easy to cause.
Disclosure of Invention
In view of the above, an object of the present utility model is to provide a porous throttle air-floating piston and cylinder, which solve one or more of the above-mentioned problems.
In order to achieve the above object, according to one aspect, the present utility model provides a porous throttle air-float piston comprising:
the piston comprises a piston main body, wherein an air cavity is arranged in the piston main body, a plurality of mounting holes are formed in the piston main body, the mounting holes are communicated with the air cavity and the outside of the piston main body along the radial direction of the piston main body, and each mounting hole comprises a first stepped hole, a second stepped hole and a third stepped hole, wherein the first stepped hole, the second stepped hole and the third stepped hole are sequentially formed from the air cavity to the outside of the piston main body, and the inner diameters of the first stepped hole, the second stepped hole and the third stepped hole are sequentially enlarged;
the check valve assembly is arranged at the end part of the piston main body and is used for controlling to close or communicate the air cavity and the outside of the piston main body;
the porous throttling assembly comprises an annular piece and a porous medium, wherein the porous medium is arranged in the first stepped hole and extends outwards to the second stepped hole, and the annular piece is arranged in the second stepped hole and is sleeved on the porous medium.
In some embodiments, the check valve assembly comprises a check valve body, a check valve block, a valve block limiting cushion block and a valve block limiting block, the check valve body is in threaded connection with the piston body, a stud is arranged at the end of the check valve body, two first ventilation holes are axially formed in the check valve body, the check valve block, the valve block limiting cushion block and the valve block limiting block are sequentially sleeved on the stud, two second ventilation holes are formed in the check valve block, four third ventilation holes are formed in the valve block limiting cushion block, the second ventilation holes and the first ventilation holes are staggered and are not communicated with each other, and the third ventilation holes are at least partially communicated with the second ventilation holes.
In some embodiments, the first vent is a kidney-shaped vent, the second vent is a kidney-shaped vent, and the third vent is a circular vent.
In some embodiments, the check valve body is provided with external threads in the circumferential direction, the piston body is provided with a threaded hole in the axial direction, the inner wall of the threaded hole is provided with internal threads, and the external threads are in meshed connection with the internal threads.
In some embodiments, a mounting groove is provided in the piston body, the valve block stopper is disposed in the mounting groove, and the depth of the mounting groove is slightly greater than the height of the valve block stopper.
In some embodiments, the one-way valve plate is a butterfly valve plate having a thickness of 0.15 mm.
In some embodiments, the ring is a fixed aluminum ring, the porous medium is a cylinder formed by sintering stainless steel powder, and the fixed aluminum ring is pressed by a tool to deform and press the porous medium.
In some embodiments, the porous media is a cylinder with a diameter of 1mm and a height of 2.5mm sintered from 316L stainless steel powder with a porosity of 30% and a filtration accuracy of 3 μm.
In some embodiments, the ring has an outer diameter of 2mm, a wall thickness of 0.5mm, and a height of 2mm, and the material is 1199 aluminum alloy.
On the other hand, the cylinder provided by the utility model comprises the air floating piston.
Compared with the prior art, the utility model has the beneficial effects that:
the porous throttling air-float piston and the air cylinder provided by the utility model adopt the porous medium to throttle and filter particle impurities in the air, have simple structure, are convenient to install, can ensure that the resistance of the porous throttling structure on the periphery to working media is approximate under the condition that the sintering process of the porous medium is always stable, ensure that the air buoyancy is the same, reduce the friction between the piston and the air cylinder and prolong the service life of moving parts.
Meanwhile, the check valve structure and the piston structure are formed separately, the validity of the check valve structure can be checked independently, and the check valve structure has the characteristics of simple structure, low processing cost and long service life and is easy to assemble.
Drawings
FIG. 1 is a schematic view of an air-floating piston according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a check valve assembly according to an embodiment of the present utility model;
FIG. 3 is a cross-sectional view of a one-way valve assembly in an embodiment of the present utility model;
FIG. 4 is a schematic view of a porous throttling element according to an embodiment of the utility model;
fig. 5 is a cross-sectional view of a porous throttling assembly in an embodiment of the utility model.
Description of the embodiments
The utility model is described in detail below with reference to the drawings and the specific embodiments.
Examples
Referring to fig. 1, a porous throttling air-float piston provided in this embodiment includes:
the piston comprises a piston body 10, wherein an air cavity 11 is arranged in the piston body 10, a plurality of mounting holes 12 are formed in the piston body 10, the mounting holes 12 are communicated with the air cavity 11 and the outside of the piston body 10 along the radial direction of the piston body 10, and each mounting hole 12 comprises a first stepped hole 121, a second stepped hole 122 and a third stepped hole 123 which are sequentially arranged from the air cavity 11 to the outside of the piston body 10 and have sequentially enlarged inner diameters;
a check valve assembly 20, wherein the check valve assembly 20 is arranged at the end part of the piston main body 10, and the check valve assembly 20 is used for controlling to close or communicate the air cavity 11 and the outside of the piston main body 10;
the porous throttling assembly 30, the porous throttling assembly 30 includes an annular member 31 and a porous medium 32, the porous medium 32 is disposed in the first stepped hole 121 and extends outwards to the second stepped hole 122, and the annular member 31 is disposed in the second stepped hole 122 and is sleeved on the porous medium 32.
Referring to fig. 2 and 3, the check valve assembly 20 includes a check valve main body 21, a check valve 22, a valve block limiting pad 23 and a valve block limiting block 24, the check valve main body 21 and the piston main body 10 are connected through threads, a stud 211 is disposed at an end portion of the check valve main body 21, two first ventilation holes 212 are axially disposed on the check valve main body 21, the check valve 22, the valve block limiting pad 23 and the valve block limiting block 24 are sequentially sleeved on the stud 211, the check valve 22 is provided with two second ventilation holes 221, the valve block limiting block 24 is provided with four third ventilation holes 241, the first ventilation holes 212 are kidney-shaped ventilation holes, the second ventilation holes 221 are kidney-shaped ventilation holes, the first ventilation holes 212 are staggered and are not communicated with each other, the third ventilation holes 241 are at least partially communicated with the second ventilation holes 221, external threads are circumferentially disposed on the check valve main body 21, the piston main body 10 is axially provided with a threaded hole 13, the threaded hole 13 is provided with internal threads, the internal wall is connected with the external threads, and the valve block 22 is in a butterfly-shaped structure with a thickness of 0.15 mm.
The check valve assembly structure and the piston main body structure are formed separately, the validity of the check valve assembly structure can be checked independently, and the check valve assembly structure has the characteristics of simple structure, low processing cost and long service life and is easy to assemble.
Referring to fig. 4 and 5, an installation groove 14 is formed in the piston main body 10, the valve block limiting block 24 is arranged in the installation groove 14, the depth of the installation groove 14 is slightly larger than the height of the valve block limiting block 24, the annular piece 31 is a fixed aluminum ring, the porous medium 32 is a cylinder formed by sintering stainless steel powder, the fixed aluminum ring is pressed by a tool to deform and press the porous medium 32, the porous medium 32 is formed by sintering 316L stainless steel powder with the porosity of 30% and the filtering precision of 3 μm, the diameter is 1mm, the height is 2.5mm, the outer diameter of the annular piece 31 is 2mm, the wall thickness is 0.5mm, the height is 2mm, and the material is 1199 aluminum alloy.
The embodiment of the utility model adopts the porous medium to throttle and filter the particle impurities in the gas, has simple structure and convenient installation, can ensure the approximate resistance of the porous throttling structure on the periphery to the working medium under the condition of ensuring the constant sintering process of the porous medium, ensures the same gas buoyancy, reduces the friction between the piston and the cylinder and prolongs the service life of moving parts.
Working principle:
when the air-float piston moves, the pressure of the gas in the compression cavity at the front end of the piston main body 10 is repeatedly changed, and when the pressure of the gas in the compression cavity is higher than the pressure of the gas in the air-float piston main body 10, the gas in the compression cavity can lead the one-way valve plate 22 to be separated from the one-way valve main body 21, and the gas in the compression cavity sequentially passes through the first vent hole 212, the second vent hole 221 and the third vent hole 241 to enter the internal air cavity 11 of the air-float piston main body 10; when the gas pressure in the compression cavity is smaller than the gas pressure in the structure of the air-float piston main body 10, the one-way valve plate 22 is closed to block the first vent hole 212, so that the structure of the air-float piston main body 10 is always kept in a high-pressure state, the high-pressure gas in the air-float piston main body 10 is filtered and throttled by the porous medium 32 to enter the middle of the cylinder and the piston to form a gas film, and the air-float piston is kept at a distance from the cylinder by the reaction force of the gas pressure, so that friction between the air-float piston and the cylinder is avoided. The smaller porosity and the size of the porous medium 32 ensure the effect of the air floating structure for supporting the air floating piston, and simultaneously reduce the influence of the air leakage of the compression cavity on the efficiency of the compressor.
Finally, it should be noted that: it will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, and that such changes and modifications are intended to be included within the scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. A porous throttle air-float piston, comprising:
the piston comprises a piston main body (10), wherein an air cavity (11) is arranged in the piston main body (10), a plurality of mounting holes (12) are formed in the piston main body (10), the mounting holes (12) are communicated with the air cavity (11) and the outside of the piston main body (10) along the radial direction of the piston main body (10), and each mounting hole (12) comprises a first stepped hole (121), a second stepped hole (122) and a third stepped hole (123) which are sequentially arranged from the air cavity (11) to the outside of the piston main body (10) and have sequentially enlarged inner diameters;
the one-way valve assembly (20) is arranged at the end part of the piston main body (10), and the one-way valve assembly (20) is used for controlling to close or communicate the air cavity (11) with the outside of the piston main body (10);
porous throttling assembly (30), porous throttling assembly (30) includes annular piece (31) and porous medium (32), porous medium (32) set up in first shoulder hole (121) and outwards extend to second shoulder hole (122), annular piece (31) set up in second shoulder hole (122) and cover is located porous medium (32).
2. The air-float piston according to claim 1, wherein the check valve assembly (20) comprises a check valve main body (21), a check valve block (22), a valve block limiting cushion block (23) and a valve block limiting block (24), the check valve main body (21) is connected with the piston main body (10) through threads, a stud (211) is arranged at the end part of the check valve main body (21), two first ventilation holes (212) are axially arranged in the check valve main body (21), the check valve block (22), the valve block limiting cushion block (23) and the valve block limiting block (24) are sequentially sleeved on the stud (211), two second ventilation holes (221) are formed in the check valve block (22), four third ventilation holes (241) are formed in the valve block limiting block (24), the second ventilation holes (221) and the first ventilation holes (212) are not communicated with each other in an staggered mode, and the third ventilation holes (241) are at least partially communicated with the second ventilation holes (221).
3. The air floating piston according to claim 2, wherein the first vent hole (212) is a kidney-shaped vent hole, the second vent hole (221) is a kidney-shaped vent hole, and the third vent hole (241) is a circular vent hole.
4. An air-floating piston according to claim 2, characterized in that the one-way valve body (21) is circumferentially provided with external threads, the piston body (10) is axially provided with a threaded hole (13), the inner wall of the threaded hole (13) is provided with internal threads, and the external threads are in meshed connection with the internal threads.
5. The air-floating piston according to claim 2, wherein a mounting groove (14) is formed in the piston main body (10), the valve block limiting block (24) is arranged in the mounting groove (14), and the depth of the mounting groove (14) is slightly larger than the height of the valve block limiting block (24).
6. An air-floating piston according to claim 2, characterized in that the one-way valve plate (22) is a butterfly valve plate with a thickness of 0.15 mm.
7. An air-floating piston according to claim 1, wherein the annular member (31) is a fixed aluminum ring, the porous medium (32) is a cylinder formed by sintering stainless steel powder, and the fixed aluminum ring is pressed by a tool to deform and press the porous medium (32).
8. An air-floating piston as claimed in claim 7, characterized in that said porous medium (32) is a cylinder with a diameter of 1mm and a height of 2.5mm, sintered from 316L stainless steel powder with a porosity of 30% and a filtering precision of 3 μm.
9. An air-floating piston as claimed in claim 7, characterized in that the ring (31) has an outer diameter of 2mm, a wall thickness of 0.5mm, a height of 2mm and a 1199 aluminium alloy.
10. A cylinder comprising an air bearing piston according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320982688.2U CN219932381U (en) | 2023-04-27 | 2023-04-27 | Porous throttling air-float piston and cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320982688.2U CN219932381U (en) | 2023-04-27 | 2023-04-27 | Porous throttling air-float piston and cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219932381U true CN219932381U (en) | 2023-10-31 |
Family
ID=88500147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320982688.2U Active CN219932381U (en) | 2023-04-27 | 2023-04-27 | Porous throttling air-float piston and cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219932381U (en) |
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2023
- 2023-04-27 CN CN202320982688.2U patent/CN219932381U/en active Active
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