CN220059847U - Piston sealing structure of gas supercharging device - Google Patents
Piston sealing structure of gas supercharging device Download PDFInfo
- Publication number
- CN220059847U CN220059847U CN202321545023.1U CN202321545023U CN220059847U CN 220059847 U CN220059847 U CN 220059847U CN 202321545023 U CN202321545023 U CN 202321545023U CN 220059847 U CN220059847 U CN 220059847U
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- Prior art keywords
- ring
- piston
- check ring
- sealing
- lip
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- 238000007789 sealing Methods 0.000 title claims abstract description 107
- 238000003825 pressing Methods 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 5
- 229920001774 Perfluoroether Polymers 0.000 claims description 4
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- -1 polytetrafluoroethylene Polymers 0.000 description 6
- 229910000792 Monel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000000462 isostatic pressing Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000004372 laser cladding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model discloses a piston sealing structure of a gas supercharging device, which relates to the technical field of piston sealing and comprises a piston, a piston cylinder body, a lip-shaped sealing ring, an upper check ring, a lower check ring and a middle check ring; the piston is assembled in the piston cylinder body in a sliding way, and the lip-shaped sealing ring, the upper check ring, the lower check ring and the middle check ring are all positioned between the piston and the piston cylinder body; the top of the lip-shaped sealing ring is provided with two sealing lips which are respectively contacted and sealed with the outer wall of the piston and the inner wall of the piston cylinder body; the upper check ring, the lower check ring and the middle check ring are positioned below the lip-shaped sealing ring; the back parts of the upper check ring and the lower check ring are propped against the outer wall of the piston, and conical openings are formed in the front surfaces of the upper check ring and the lower check ring; the middle check ring is of a conical structure and is embedded into the conical opening, and the back of the middle check ring abuts against the inner wall of the piston cylinder body. The piston sealing structure utilizes two sealing lips of the lip-shaped sealing ring to seal the piston and the piston cylinder body, and utilizes the self-tightening of the upper check ring, the lower check ring and the middle check ring to eliminate the gap.
Description
Technical Field
The utility model relates to the technical field of piston sealing, in particular to a piston sealing structure of a gas supercharging device.
Background
In certain industrial applications, it is often desirable to utilize a pressurized gas supply system to provide high pressure gas to a device. For example, a pressurized gas supply system is used to reliably supply a normal temperature and high pressure gas having a maximum operating pressure of about 100MPa to the heater apparatus.
The supercharging air supply system mainly comprises a gas supercharging device, a low-pressure air source, a compressed air source, a valve, a pipeline and the like, wherein the gas supercharging device is a core component of the supercharging air supply system and mainly comprises a low-pressure cylinder and a supercharging cylinder, the supercharging cylinder bears extremely high pressure (such as 100 MPa), a high-pressure sealing structure of an internal piston is particularly important, if the sealing is unstable, the high-pressure gas in the supercharging cylinder is extremely easy to enter the other side of the piston to cause sealing failure, and the operation of the gas supercharging device is influenced.
The high-pressure sealing structure in the prior art has two main structural forms, one is a sealing structure with a tersburg seal under extremely high pressure, two check rings can not be tightly adhered to a tight cover after the structure, gaps are easy to generate, and a front-end lip-shaped sealing ring is extremely easy to press into the gaps of the check rings to form a blocking phenomenon. The elastic lip of the lip-shaped sealing ring is connected with the rear end in a thinner thickness and is easy to deform. The other is a constant sealing structure of the vehicle, the main structure is combined sealing of an O-shaped ring and a sliding ring, the O-shaped ring of the structure is easy to deform and extrude, the sliding ring is made of PTFE, and the sealing is not easy to achieve molecular level.
In addition, a stoneley seal is also a common high pressure seal structure. The sealing device comprises a sealing device, a sealing device and a sealing device, wherein the sealing device comprises an O-shaped rubber sealing ring and a polytetrafluoroethylene sealing ring, the O-shaped rubber sealing ring is used as a sealing force source, and when the pressure is 0, the sealing force is formed by acting on the polytetrafluoroethylene sealing ring through the elastic force of the O-shaped rubber sealing ring in self pre-deformation. When bearing pressure, the gas pressure acts on the O-shaped rubber seal and compresses, so that the polytetrafluoroethylene seal generates higher sealing acting force. The higher the pressure is, the more reliable the seal is, and the polytetrafluoroethylene has a certain self-lubricating function.
In the prior art, few documents related to ultra-high pressure sealing material selection and structure are adopted, in the documents which can be queried in the prior art, fan Xing et al adopt ABAQUS software to establish a two-dimensional axisymmetric model of a Y-shaped sealing structure (a rubber ring and a metal ring) of the warm isostatic pressing complete equipment, the contact stress changes under the pressure of 0, 50, 100, 150 and 200MPa are analyzed, and a sealing test is carried out in the warm isostatic pressing complete equipment, wherein the sealing structure can realize sealing at 300 ℃ and 200MPa, oil liquid does not leak, and the oil does not leak after the pressure is maintained for 10 minutes. Zhao Minmin et al established a two-dimensional axisymmetric model of a Y-shaped seal ring for a 20T excavator bucket cylinder piston rod by using finite element analysis software ANSYS, and contact surface contact pressure at oil pressure of 34.3 MPa. Wang Gang et al analyzed the deformation and maximum contact stress of the hydraulic mount with Y-shaped seal rings at 0-31.5 MPa. Du Guxi et al employ finite element analysis of the sealing characteristics of a Y-shaped seal for a hydraulic cylinder piston rod in a dynamic and static sealing state, with a pressure range of 0-30MPa.
In view of the foregoing, in combination with the high pressure sealing structure in the prior art, a new piston sealing structure is needed
For use in a gas pressurizing device.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide a piston sealing structure of a gas supercharging device, and provides a novel piston sealing structure on the basis of combining the advantages of a super-high pressure sealing structure and a constant-pressure sealing structure of a vehicle and the advantages of the existing high-pressure Y-shaped sealing structure.
In order to achieve the above purpose, the present utility model adopts the technical scheme that:
a piston sealing structure of a gas supercharging device comprises a piston, a piston cylinder body, a lip-shaped sealing ring, an upper check ring, a lower check ring and a middle check ring;
the piston is slidably assembled in the piston cylinder body, and the lip-shaped sealing ring, the upper check ring, the lower check ring and the middle check ring are all positioned between the piston and the piston cylinder body;
the top of the lip-shaped sealing ring is provided with two sealing lips which are respectively contacted and sealed with the outer wall of the piston and the inner wall of the piston cylinder body;
the upper check ring, the lower check ring and the middle check ring are all positioned below the lip-shaped sealing ring; the back parts of the upper check ring and the lower check ring are propped against the outer wall of the piston, and conical openings are formed in the front surfaces of the upper check ring and the lower check ring; the middle check ring is of a conical structure and is embedded into the conical opening, and the back of the middle check ring abuts against the inner wall of the piston cylinder body.
Preferably, a fixed groove is formed in the side wall of the piston, the lip-shaped sealing ring is installed on the upper portion of the fixed groove, and the upper check ring, the lower check ring and the middle check ring are installed on the lower portion of the fixed groove.
Preferably, a pressing plate is arranged above the lip-shaped sealing ring, and the pressing plate is detachably arranged beside the fixing groove through a mounting piece.
Preferably, lubricating grease is added into a sealing gap of the lip-shaped sealing ring.
Preferably, the upper retainer ring and the lower retainer ring are of an up-down symmetrical structure, tapered cavities are arranged at the mutually close ends of the upper retainer ring and the lower retainer ring, and the two tapered cavities form the tapered opening.
Preferably, the cross section of the middle check ring is triangular.
Preferably, the lip seal is perfluoroether rubber.
Preferably, the upper retainer ring, the lower retainer ring and the middle retainer ring are made of polytetrafluoroethylene and copper.
Preferably, the material of the piston cylinder body is 316LIV surfacing Monel K500.
The utility model has the beneficial effects that:
the piston sealing structure provided by the utility model has double sealing effects, namely, the piston and the piston cylinder body are sealed by utilizing two sealing lips of the lip-shaped sealing ring, and the gap is eliminated by utilizing self-tightening of the upper check ring, the lower check ring and the middle check ring, so that the piston and the piston cylinder body are sealed, and high-pressure medium is prevented from passing through the gap.
According to the piston sealing structure provided by the utility model, the lip-shaped sealing ring is provided with two sealing lips, lubricating grease is added into a sealing gap, so that additional lubrication is kept, dry friction and abrasion are reduced, the service life of a sealing element is prolonged, and meanwhile, the back surface of the lip-shaped sealing ring adopts a self-tightening gap elimination sealing structure design. The upper check ring, the lower check ring and the middle check ring are pushed by the force acted on the lip-shaped sealing ring based on the air pressure, and the joint surfaces of the upper check ring, the lower check ring and the middle check ring are of conical structures, so that the upper check ring, the lower check ring and the middle check ring can respectively generate inward and outward acting forces under the action of the force, the gap is eliminated, and a certain sealing effect is achieved.
Drawings
FIG. 1 is a schematic illustration of a piston seal of the present utility model;
FIG. 2 is a schematic illustration of the piston seal of the present utility model on a gas pressurization device;
reference numerals:
1. a piston; 2. a piston cylinder; 3. a lip seal; 4. an upper retainer ring; 5. a lower retainer ring; 6. a middle retainer ring; 7. a pressing plate; 8. and a mounting member.
Detailed Description
The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model.
Example 1
The piston sealing structure of the gas supercharging device comprises a piston 1, a piston cylinder body 2, a lip-shaped sealing ring 3, an upper check ring 4, a lower check ring 5 and a middle check ring 6 as shown in figures 1 and 2;
the piston 1 is slidably assembled in the piston cylinder 2, and the lip-shaped sealing ring 3, the upper check ring 4, the lower check ring 5 and the middle check ring 6 are all positioned between the piston 1 and the piston cylinder 2;
the top of the lip-shaped sealing ring 3 is provided with two sealing lips which are respectively contacted and sealed with the outer wall of the piston 1 and the inner wall of the piston cylinder body 2;
the upper check ring 4, the lower check ring 5 and the middle check ring 6 are all positioned below the lip-shaped sealing ring 3; the back parts of the upper check ring 4 and the lower check ring 5 are propped against the outer wall of the piston 1, and conical openings are formed in the front surfaces of the upper check ring 4 and the lower check ring 5; the middle check ring 6 is of a conical structure and is embedded into the conical opening, and the back of the middle check ring 6 abuts against the inner wall of the piston cylinder body 2.
In this embodiment, the lip seal 3 is a first seal structure between the piston 1 and the piston cylinder 2, and the piston 1 and the piston cylinder 2 are sealed by two seal lips of the lip seal 3. The upper check ring 4, the lower check ring 5 and the middle check ring 6 are second sealing structures between the piston 1 and the piston cylinder body 2, and the self-tightening clearance is eliminated by utilizing the second sealing structures to seal the piston 1 and the piston cylinder body 2 and prevent high-pressure medium from passing through the clearance.
Example 2
This embodiment is further described on the basis of embodiment 1, and as shown in fig. 1, a fixed groove is provided on the side wall of the piston 1, the lip seal ring 3 is installed on the upper portion of the fixed groove, and the upper retainer ring 4, the lower retainer ring 5 and the middle retainer ring 6 are installed on the lower portion of the fixed groove. The lip-shaped sealing ring 3, the upper retainer ring 4, the lower retainer ring 5 and the middle retainer ring 6 are arranged through the fixing grooves with the above-mentioned forms.
As shown in fig. 1, a pressing plate 7 is arranged above the lip-shaped sealing ring 3, and the pressing plate 7 is detachably arranged beside the fixed groove through a mounting piece 8. The mounting piece 8 is an inner hexagon screw, and presses the lip seal ring 3, the upper check ring 4, the lower check ring 5 and the middle check ring 6 through the pressing plate 7 to prevent the lip seal ring from falling off. Lubricating grease is added into the sealing gap of the lip-shaped sealing ring 3, so that additional lubrication is maintained, dry friction and abrasion are reduced, and the service life of the sealing element is prolonged.
As shown in fig. 1, the upper retainer ring 4 and the lower retainer ring 5 are in an up-down symmetrical structure, tapered cavities are arranged at the mutually close ends of the upper retainer ring and the lower retainer ring, and the two tapered cavities form tapered openings. The cross section of the middle retainer ring 6 is triangular. The upper retainer ring 4, the lower retainer ring 5 and the middle retainer ring 6 are arranged in the above-mentioned mode, so that the gap is eliminated by self-tightening.
The lip-shaped sealing ring 3 is made of perfluoroether rubber. The retainer ring 4, the lower retainer ring 5 and the middle retainer ring 6 are made of polytetrafluoroethylene and copper. The material of the piston cylinder 2 is 316LIV build-up welding Monel K500.
The piston cylinder working medium of the gas pressurizing device is extremely high pressure gas of 100MPa, and common materials such as stainless steel can fail due to combustion when CL2000 or more. To prevent the material from burning at high temperature, monel K500 is deposited on the inner wall surface of the piston cylinder. Monel alloy has the working temperature of-29-480 ℃, has extremely excellent gas-resistant flame-retardant performance, high exemption pressure and good mechanical property in high-pressure and extremely high-pressure gas, and is widely used for manufacturing high-pressure and extremely high-pressure gas valves and equipment. In particular the body material of high-pressure and "very high-pressure" gas pipelines and equipment of aviation and aerospace systems.
Compared with the gun steel belonging to high-carbon steel, the oxidation resistance and welding performance of the 316L, F321 and 304 stainless steel materials of the austenitic stainless steel are superior to those of the gun steel, the fracture toughness of the materials is equivalent to that of the gun steel, and the overall performance is superior to that of the gun steel, so that the piston cylinder body material is made of 316L austenitic stainless steel, monel k500 alloy is deposited on the inner surface of the cylinder body, and the deposition process adopts laser cladding welding.
For a better understanding of the present utility model, the following is a complete description of the principles of the utility model:
the lip-shaped sealing ring 3 is designed with two sealing lips, lubricating grease is added into a sealing gap, so that additional lubrication is maintained, dry friction and abrasion are reduced, the service life of a sealing element is prolonged, and meanwhile, the back surface of the lip-shaped sealing ring adopts a self-tightening gap elimination sealing structure design. The working principle of the structure is that the upper check ring 4, the lower check ring 5 and the middle check ring 6 are pushed by the force of the air pressure acting on the lip-shaped sealing ring 3. Because the joint surfaces of the upper check ring, the lower check ring and the middle check ring 6 are of conical structures, the upper check ring, the lower check ring and the middle check ring 6 respectively generate inward and outward acting forces under the action of force, so that gaps are eliminated, and a certain sealing effect is achieved. The perfluoroether rubber has small elasticity, cannot be filled into the fixing groove during assembly, adopts the design structure of the pressing plate 7, the pressing plate 7 is fixed by using an inner hexagon screw, and a spring washer is used between the pressing plate 7 and the inner hexagon screw to prevent loosening.
While the embodiments of the present utility model have been described in detail, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (7)
1. The piston sealing structure of the gas supercharging device is characterized by comprising a piston (1), a piston cylinder body (2), a lip-shaped sealing ring (3), an upper check ring (4), a lower check ring (5) and a middle check ring (6);
the piston (1) is slidably assembled in the piston cylinder body (2), and the lip-shaped sealing ring (3), the upper check ring (4), the lower check ring (5) and the middle check ring (6) are all positioned between the piston (1) and the piston cylinder body (2);
two sealing lips are arranged at the top of the lip-shaped sealing ring (3) and are respectively in contact and seal with the outer wall of the piston (1) and the inner wall of the piston cylinder body (2);
the upper check ring (4), the lower check ring (5) and the middle check ring (6) are all positioned below the lip-shaped sealing ring (3); the back parts of the upper check ring (4) and the lower check ring (5) are propped against the outer wall of the piston (1), and conical openings are formed in the front surfaces of the upper check ring (4) and the lower check ring (5); the middle check ring (6) is of a conical structure and is embedded into the conical opening, and the back of the middle check ring (6) is propped against the inner wall of the piston cylinder body (2).
2. The piston sealing structure according to claim 1, wherein a fixed groove is provided on a side wall of the piston (1), the lip seal ring (3) is installed on an upper portion of the fixed groove, and the upper retainer ring (4), the lower retainer ring (5) and the middle retainer ring (6) are installed on a lower portion of the fixed groove.
3. The piston sealing structure according to claim 2, characterized in that a pressing plate (7) is arranged above the lip seal ring (3), and the pressing plate (7) is detachably mounted beside the fixing groove through a mounting piece (8).
4. The piston sealing arrangement according to claim 1, characterized in that grease is added to the sealing gap of the lip seal (3).
5. The piston sealing structure according to claim 1, wherein the upper retainer ring (4) and the lower retainer ring (5) are of an up-down symmetrical structure, tapered cavities are arranged at mutually close ends of the upper retainer ring and the lower retainer ring, and the two tapered cavities form the tapered opening.
6. A piston sealing arrangement according to claim 1, characterized in that the cross section of the intermediate collar (6) is triangular.
7. The piston seal according to claim 1, characterized in that the lip seal (3) is perfluoroether rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321545023.1U CN220059847U (en) | 2023-06-16 | 2023-06-16 | Piston sealing structure of gas supercharging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321545023.1U CN220059847U (en) | 2023-06-16 | 2023-06-16 | Piston sealing structure of gas supercharging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220059847U true CN220059847U (en) | 2023-11-21 |
Family
ID=88763414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321545023.1U Active CN220059847U (en) | 2023-06-16 | 2023-06-16 | Piston sealing structure of gas supercharging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220059847U (en) |
-
2023
- 2023-06-16 CN CN202321545023.1U patent/CN220059847U/en active Active
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