CN112483653B - Inflatable rubber sealing device - Google Patents
Inflatable rubber sealing device Download PDFInfo
- Publication number
- CN112483653B CN112483653B CN202011179932.9A CN202011179932A CN112483653B CN 112483653 B CN112483653 B CN 112483653B CN 202011179932 A CN202011179932 A CN 202011179932A CN 112483653 B CN112483653 B CN 112483653B
- Authority
- CN
- China
- Prior art keywords
- sealing
- sealing rubber
- rubber
- wedge
- supporting seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Architecture (AREA)
- Fluid Mechanics (AREA)
- Sealing Devices (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides an inflatable rubber sealing device, which is characterized in that sealing rubber is embedded in a wedge-shaped groove of a supporting seat, so that the sealing rubber is prevented from rolling out of the supporting seat by the friction force of pitching action of a gun body when the sealing rubber is not completely separated from an arc surface of a cradle guard plate, and further the sealing structure is damaged. The sealing component is combined on the protection device through the combining bolt, so that the sealing component is ensured to have enough rigidity. The cross section of the sealing rubber is designed into an M-shaped structure, the protruding lips on the two sides can play a role in water prevention under the air discharge condition and can also effectively prevent dust, and therefore the rubber at the middle inflation position is protected.
Description
Technical Field
The invention belongs to the technical field of ship guns, and particularly relates to an inflatable rubber sealing device.
Background
The working environment of the ship cannon is extremely severe, the working temperature range of the sea surface is-40 ℃ to 50 ℃, and the ship cannon is faced with a series of unstable factors such as high-concentration saline and alkaline, sunlight aging, oxidative weathering, corrosion and rust at any time. Therefore, the sealing degree between the protection device and the arc surface of the cradle guard plate directly influences the service life and the operation precision of all parts in the protection device.
The rotary sealing structure has various forms, and the traditional sealing aiming at the naval gun can be divided into: rubber material seals, packing seals, mechanical seals, labyrinth seals, magnetic fluid seals, and the like.
Traditional sealing device can realize sealed effect in theory, but machining precision to upper and lower backplate arc surface requires relatively high at the machine and adds the in-process, and is also very high to assembler's operation level requirement, and needs constantly real-time measurement to adjust the clearance volume between sealing member and the cradle backplate arc surface, and it is inconvenient to require the height and dismantle to each link, and the existing service product result of use is also not ideal.
Disclosure of Invention
Based on the reasons, the invention provides the inflatable rubber sealing device, which compensates the gap amount between the assembly parts due to processing assembly errors and abrasion by utilizing an inflation principle, and the sealing rubber has good expansion characteristic and weather resistance, so that the sealing reliability under long-time navigation or extreme working conditions is ensured, and the internal structure of the gun is effectively protected.
The technical scheme of the invention is as follows:
an inflatable rubber sealing device comprises a supporting seat 7, sealing rubber 8, a bolt handle part 9 and a sealing gasket 10; the supporting seat 7 is integrally in the shape of a circular arc matched with the arc surface 4 of the cradle guard plate, the axial cross section of the supporting seat 7 comprises two supporting arms, one of the supporting arms is used for fastening the assembly 9 on the protection device 11 through a bolt, and a sealing gasket 10 is arranged at a hole closing position between the supporting arm of the supporting seat 7 and the protection device 11 so as to prevent rainwater from flowing into the protection device 11 along the hole. The lower surface of the other support arm of the support seat 7 is provided with a wedge-shaped groove for accommodating the sealing rubber 8, the upper end of the wedge-shaped groove is wide, and the lower end of the wedge-shaped groove is narrow.
The sealing rubber 8 is in a strip shape or an arc shape as a whole, and the sealing rubber 8 includes a connection portion located at an upper portion for connection with the wedge-shaped groove of the support base 7 and a working portion located at a lower portion for water and dust prevention.
The axial section of the working part of the sealing rubber 8 is of an M-shaped structure, the axial section of the connecting part of the sealing rubber 8 is of a wedge shape and is matched with the wedge-shaped groove of the supporting seat 7, and the outer surface of the connecting part of the sealing rubber 8 is mutually bonded with the inner surface of the wedge-shaped groove of the supporting seat 7.
An inflation cavity is formed in the lower portion of the connecting portion of the sealing rubber 8 along the length direction of the sealing rubber 8.
The area of the axial section of the inflation cavity is 1/6-1/7 of the area of the axial section of the sealing rubber 8, the axial section of the inflation cavity is of an oval structure, the long diameter of the oval is about half of the length of the axial section of the sealing rubber 8, the short diameter of the oval is about 1/3 of the maximum width of the wedge shape of the axial section of the sealing rubber 8, and the rubber thicknesses of the two sides of the outer part of the short diameter of the oval inflation cavity are the same. The annular cavity is distributed in the whole sealing rubber 8, and 5mm of rubber allowance is reserved on the inner side of the radial end head of the sealing rubber 8.
The sealing rubber 8 is provided with an air inlet pipe, the air inlet pipe is communicated with an inflation cavity of the sealing rubber 8, the air inlet pipe is provided with an inflation connector, the inflation connector is connected with the elastic sealing pneumatic valve group through a miniature connector and a butt joint, and the inflation and deflation of the inflation cavity of the sealing rubber 8 are realized through the air inlet pipe and the elastic sealing pneumatic valve group.
The elastic sealing pneumatic valve group is mainly formed by sequentially connecting a nitrogen cylinder 12, a pressure reducing valve 13, a pressure gauge, a one-way valve 15, a safety valve 16, the pressure gauge, a hand valve 17 and a silencer 18.
Further, the sealing rubber 8 satisfies the following parameters:
the tensile strength is 15-30 MPa; the elongation is 100-200%; permanent deformation of 6-7% after 24h of 200% stretching; the rebound resilience is 50-65%; experimental conditions 100x70h permanent compression set < 30%; the long-term working temperature range is-40-50 ℃; shore hardness is 20-30 degrees; the elastic modulus is 3.6-4.8 MPa.
The invention has the advantages that:
the inflatable rubber sealing device disclosed by the invention has strong real-time compensation performance, can effectively prevent rainwater and sea waves from entering the interior of the protective device, and avoids rusting key parts, so that the operation precision and the service life of the ship cannon are further ensured, in addition, the inflation and deflation operations are convenient and fast, the requirement on the technical level of an operator is low, and the use requirement on a ship can be well met.
Drawings
Fig. 1 is a schematic view of the sealing device.
Fig. 2 is a schematic cross-sectional view of a seal member.
Fig. 3 is a schematic structural diagram of a pneumatic valve set.
In the figure: 1, sealing at the right side; 2, sealing; 3, sealing at the left side; 4, arc surface of cradle guard board; 5 pitching tooth arc; sealing under 6; 7, supporting a seat; 8, sealing rubber; 9 a bolt handle assembly; 10, sealing gaskets; 11 a guard; 12 nitrogen gas cylinder; 13 a pressure reducing valve; 14 pressure gauge; 15 a one-way valve; 16 a safety valve; 17 a hand valve; 18 muffler.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
It is to be understood that the appended drawings are not to scale, but are merely drawn with appropriate simplifications to illustrate various features of the basic principles of the invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment.
In the several figures of the drawings, identical or equivalent components (elements) are referenced with the same reference numerals.
In the description of the present invention, it should be noted that the terms "central", "longitudinal", "transverse", "axial", "radial", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Fig. 1 is a schematic view of the sealing device. As shown in fig. 1, the inflatable rubber sealing device is arranged at four positions according to left, right, upper and lower directions, and a right seal 1 and a left seal 3 are respectively lapped with the left side and the right side of an arc surface 4 of a cradle guard plate; the upper seal 2 is lapped with a cradle guard plate bus; the lower seal 6 is lapped with the pitching tooth arc 5, so that the integral sealing function is realized.
Fig. 2 is a schematic cross-sectional view of a seal member. As shown in fig. 2, the inflatable rubber sealing device includes a support base 7, a sealing rubber 8, a bolt engaging member 9, and a gasket 10.
The supporting seat 7 is integrally in the shape of a circular arc matched with the arc surface 4 of the cradle guard plate, the axial cross section of the supporting seat 7 comprises two supporting arms, one of the supporting arms is fastened on the protection device 11 through a bolt, a closing hole part 9 is fastened on the protection device 11 through a bolt, and a sealing gasket 10 is arranged between the supporting arm of the supporting seat 7 and the protection device 11 to prevent rainwater from flowing into the protection device 11 along the hole. The lower surface of the other support arm of the support seat 7 is provided with a wedge-shaped groove for accommodating the sealing rubber 8, the upper end of the wedge-shaped groove is wide, and the lower end of the wedge-shaped groove is narrow.
The sealing rubber 8 is in a strip shape or an arc shape as a whole, and the sealing rubber 8 includes a connection portion located at an upper portion for connection with the wedge-shaped groove of the support base 7 and a working portion located at a lower portion for water and dust prevention.
The working part of the sealing rubber 8 is of an M-shaped structure along the axial section, and protruding lips on two sides of the M-shaped working part can play a waterproof role under the air bleeding condition and can also effectively prevent dust, so that the rubber of the inflation cavity of the connecting part is protected.
The axial section of the connecting part of the sealing rubber 8 is wedge-shaped and is matched with the wedge-shaped groove of the supporting seat 7, and the outer surface of the connecting part of the sealing rubber 8 is mutually bonded with the inner surface of the wedge-shaped groove of the supporting seat 7, for example, dauber (r) glue is adhered and fixed. The wedge-shaped groove of the supporting seat 7 with wide upper end and narrow lower end prevents that the sealing rubber 8 is rolled out of the supporting seat 7 by the friction force of pitching motion of the gun body when the sealing rubber 8 is not completely separated from the arc surface 4 of the cradle guard plate, so that the sealing structure is damaged.
An inflation cavity is formed in the lower portion of the connecting portion of the sealing rubber 8 along the length direction of the sealing rubber 8.
The area of the axial section of the inflation cavity is 1/6-1/7 of the area of the axial section of the sealing rubber 8, the axial section of the inflation cavity is of an oval structure, the long diameter of the oval is about half of the length of the axial section of the sealing rubber 8, the short diameter of the oval is about 1/3 of the maximum width of the wedge shape of the axial section of the sealing rubber 8, and the rubber thickness of the two sides of the outer part of the short diameter of the oval inflation cavity is the same.
The annular cavity is distributed in the whole sealing rubber 8, and 5mm of rubber allowance is reserved on the inner side of the radial end head of the sealing rubber 8. When the sealing rubber annular cavity is filled with compressed nitrogen, the sealing rubber vertical surfaces on the left side and the right side of the annular cavity in the length direction extend along the radial direction and are closely attached to the arc surface of the cradle guard plate, so that seawater and rainwater are effectively prevented from entering the protective device when the naval vessel travels. When the sealing rubber is deflated, the sealing rubber on the two sides of the annular cavity contracts and is separated from the arc surface of the cradle guard plate by a certain gap, so that the gun body can flexibly perform pitching motion, and abrasion to the sealing device is avoided.
According to the working condition requirements of the naval gun, the material parameters of the sealing rubber are provided in the embodiment, and the parameters comprise: tensile strength, section elongation, rebound, shore hardness, elastic modulus, and various weatherability requirements, see in particular the following table:
the sealing rubber 8 is provided with an air inlet pipe, the air inlet pipe is communicated with an inflation cavity of the sealing rubber 8, the air inlet pipe is provided with an inflation connector, the inflation connector is connected with the elastic sealing pneumatic valve group through a micro connector and a butt joint, the inflation sealing effect is guaranteed, and the pressure maintaining test is carried out for 10 min. The air charging cavity of the sealing rubber 8 is charged and discharged through the air inlet pipe and the elastic sealing pneumatic valve group.
The elastic sealing pneumatic valve set mainly comprises a nitrogen cylinder 12, a pressure reducing valve 13, a pressure gauge 14, a one-way valve 15, a safety valve 16, the pressure gauge 14, a hand valve 17 and a silencer 18 which are connected in sequence. The working pressure of the system is 1MPa, the using pressure of the gas cylinder is 15MPa, the number of the gas flow passing through the pressure reducing valve and then the first pressure gauge 14 (the pressure gauge close to the nitrogen gas cylinder 12) is 1MPa, and then the gas flow is ensured not to flow back through the one-way valve when the gas flow of the gas cylinder is insufficient. The whole safe and reliable of valves is guaranteed to the relief valve, and second block pressure gauge 14 (the manometer of keeping away from nitrogen cylinder 12) is used for surveing valves in-service use pressure, avoids leading to sealed the inefficacy because of the tolerance is not enough. The operator only needs to close the hand valve and open the gas cylinder valve when the system needs to be inflated, and close the gas cylinder valve and open the hand valve when the system needs to be deflated.
The section size and the inflation pressure are determined by calculating the tensile stress of the section of the sealing rubber, the pipe diameter of an inflation pneumatic system is determined according to the total amount of gas in an inflation cavity, and a corresponding pneumatic valve group is designed. Specifically, in this embodiment, the working pressure in the pneumatic valve set and the annular cavity is 1MPa, the elongation of the rubber is 2mm, the tensile stress of the rubber is 0.96MPa, and the volume of the air in the tube is about 2.5L. The inner diameter of the air inlet pipeline is selected to be 4mm, the total amount of air flow required by each inflation is about 0.33L, and when a gas cylinder with the gas storage amount of 12L is selected, the requirement of 30 times of inflation can be met.
To sum up, in this embodiment, inflatable rubber sealing device inlays sealing rubber in the wedge recess of supporting seat, prevents when sealing rubber and cradle backplate arc surface do not break away from completely, and the frictional force of barrel every single move action rolls up sealing rubber out of supporting seat, and then leads to seal structure to damage. The sealing component is combined on the protection device through the combining bolt, so that the sealing component is ensured to have enough rigidity. The cross section of the sealing rubber is designed into an M-shaped structure, the protruding lips on the two sides can play a role in water prevention under the air discharge condition and can also effectively prevent dust, and therefore the rubber at the middle inflation position is protected.
A special pneumatic valve set is designed, and by utilizing the inflation principle, when compressed nitrogen is injected into a sealing rubber annular cavity, sealing rubber vertical surfaces on two sides of the annular cavity extend along the radial direction and are closely attached to an arc surface of a cradle guard plate, so that seawater and rainwater are effectively prevented from entering a protective device when a naval vessel travels. When the sealing rubber is deflated, the sealing rubber on the two sides of the annular cavity contracts and is separated from the arc surface of the cradle guard plate by a certain gap, so that the gun body can flexibly perform pitching motion, and abrasion to the sealing device is avoided.
The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (2)
1. The inflatable rubber sealing device is characterized by comprising a supporting seat (7), sealing rubber (8), a bolt handle assembly (9) and a sealing gasket (10); wherein the content of the first and second substances,
the supporting seat (7) is integrally in a circular arc shape matched with the arc surface (4) of the cradle guard plate, the cross section of the supporting seat (7) along the axial direction comprises two supporting arms, one of the supporting arms is used for fastening the combined piece (9) on the protection device (11) through a bolt, and a sealing gasket (10) is arranged at a hole closing position between the supporting arm of the supporting seat (7) and the protection device (11) so as to prevent rainwater from flowing into the protection device (11) along the hole; the lower surface of the other support arm of the support seat (7) is provided with a wedge-shaped groove for containing sealing rubber (8), the upper end of the wedge-shaped groove is wide, and the lower end of the wedge-shaped groove is narrow;
the whole sealing rubber (8) is in a strip shape or an arc shape, and the sealing rubber (8) comprises a connecting part which is used for being connected with the wedge-shaped groove of the supporting seat (7) and is positioned at the upper part and a working part which is used for preventing water and dust and is positioned at the lower part; the working part of the sealing rubber (8) is of an M-shaped structure along the axial section; the axial section of the connecting part of the sealing rubber (8) is wedge-shaped and is matched with the wedge-shaped groove of the supporting seat (7), and the outer surface of the connecting part of the sealing rubber (8) is mutually bonded with the inner surface of the wedge-shaped groove of the supporting seat (7);
an inflation cavity is formed in the lower part of the connecting part of the sealing rubber (8) along the length direction of the sealing rubber (8); the area of the axial section of the inflation cavity is 1/6-1/7 of the area of the axial section of the sealing rubber (8);
the sealing rubber (8) is provided with an air inlet pipe, the air inlet pipe is communicated with an inflation cavity of the sealing rubber (8), the air inlet pipe is provided with an inflation joint, the inflation joint is connected with the elastic sealing pneumatic valve group through a micro joint and a butt joint, and the inflation cavity of the sealing rubber (8) is inflated and deflated through the air inlet pipe and the elastic sealing pneumatic valve group;
the elastic sealing pneumatic valve group is formed by sequentially connecting a nitrogen cylinder (12), a pressure reducing valve (13), a pressure gauge, a one-way valve (15), a safety valve (16), the pressure gauge, a hand valve (17) and a silencer (18);
the axial section of the inflatable cavity is of an oval structure, the long diameter of the oval is half of the length of the axial section of the sealing rubber (8), the short diameter of the oval is 1/3 of the maximum width of the wedge of the axial section of the sealing rubber (8), and the rubber thicknesses of the two sides of the outer part of the short diameter of the oval inflatable cavity are the same; the annular cavity is distributed in the whole sealing rubber (8), and 5mm of rubber allowance is reserved on the inner side of the radial end head of the sealing rubber (8).
2. The inflatable rubber sealing device according to claim 1, wherein said sealing rubber (8) satisfies the following parameters: the tensile strength is 15-30 MPa; the elongation is 100-200%; permanent deformation of 6-7% after 24h of 200% stretching; the rebound resilience is 50-65%; experimental conditions 100x70h permanent compression set < 30%; the long-term working temperature range is-40-50 ℃; shore hardness is 20-30 degrees; the elastic modulus is 3.6-4.8 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011179932.9A CN112483653B (en) | 2020-10-29 | 2020-10-29 | Inflatable rubber sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011179932.9A CN112483653B (en) | 2020-10-29 | 2020-10-29 | Inflatable rubber sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112483653A CN112483653A (en) | 2021-03-12 |
| CN112483653B true CN112483653B (en) | 2022-09-16 |
Family
ID=74927723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011179932.9A Active CN112483653B (en) | 2020-10-29 | 2020-10-29 | Inflatable rubber sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112483653B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113581445A (en) * | 2021-08-03 | 2021-11-02 | 中国航空工业集团公司沈阳飞机设计研究所 | Aircraft cockpit cover fuselage opening frame sealing structure and assembly method |
| CN114001282B (en) * | 2021-11-09 | 2024-04-12 | 深圳能源环保股份有限公司 | Sludge distribution conveying system with rotary curved pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201891841U (en) * | 2010-12-10 | 2011-07-06 | 苏州江南航天机电工业有限公司 | Inflatable sealing structure of extended cabinet |
| CN104405265B (en) * | 2014-10-15 | 2016-02-03 | 浙江省海洋开发研究院 | A kind of cabin door Inflatable sealing structure |
| CN204226651U (en) * | 2014-11-20 | 2015-03-25 | 九江翔升造船有限公司 | A kind of ship stern seal arrangement |
| CN105465517A (en) * | 2015-12-30 | 2016-04-06 | 中国核电工程有限公司 | Inflation sealing device |
| CN109216225B (en) * | 2017-06-30 | 2020-11-24 | 沈阳芯源微电子设备股份有限公司 | Movable inflatable sealing device and using method thereof |
-
2020
- 2020-10-29 CN CN202011179932.9A patent/CN112483653B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112483653A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112483653B (en) | Inflatable rubber sealing device | |
| CN211500955U (en) | Stainless steel valve box with packing sleeve structure | |
| CN214219566U (en) | Marine booster station ship-berthing component | |
| CN112431800A (en) | Gas-liquid isolation sealing method for piston type energy accumulator | |
| CN210687002U (en) | Radial combined sealing structure of axial flow type regulating valve | |
| CN102042403B (en) | Pressure water storage barrel with protection unit | |
| CN212804190U (en) | Main sealing structure of pure water medium hydraulic support piston for preventing friction collision | |
| CN219754931U (en) | Top cover for hydraulic valve | |
| CN209309046U (en) | A kind of cylinder piston head sealing structure | |
| CN220268426U (en) | Pipeline sealing ring assembly | |
| CN219262946U (en) | Bolt sealing waterproof device | |
| CN2738034Y (en) | Sheath type air spring | |
| CN214118438U (en) | Cylinder head for reciprocating piston type gas compressor | |
| CN214092485U (en) | Hydraulic/pneumatic piston type accumulator combined sealing structure | |
| CN217761591U (en) | Steel pipe for ship | |
| CN221170758U (en) | Split type high-pressure boiler floating oil seal | |
| CN218818412U (en) | Prevent novel discharge valve of high gas tightness of excessive pressure impact | |
| CN219221368U (en) | Valve body sealing structure | |
| CN215257125U (en) | Front-mounted damping structure for hydraulic oil cylinder | |
| CN221144881U (en) | Hydraulic pumping unit oil cylinder sealing device | |
| CN219452053U (en) | Water distributor with good sealing performance | |
| CN201090875Y (en) | Middle and high pressure loose tube expansion joint | |
| CN220134932U (en) | Corrosion-resistant anti-pulling high-sealing three-way joint | |
| KR20100012460A (en) | Large volume water hammer cushion | |
| CN112483652B (en) | Wedge compensation type every single move sealing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |