CN112879564B - Corrosion-resistant sealing device for generating continuous axial fitting force by utilizing Poisson effect - Google Patents
Corrosion-resistant sealing device for generating continuous axial fitting force by utilizing Poisson effect Download PDFInfo
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- CN112879564B CN112879564B CN202110042730.8A CN202110042730A CN112879564B CN 112879564 B CN112879564 B CN 112879564B CN 202110042730 A CN202110042730 A CN 202110042730A CN 112879564 B CN112879564 B CN 112879564B
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- 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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- 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
- F16J15/002—Sealings comprising at least two sealings in succession
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- 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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
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- 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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/068—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing swelling under working conditions
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- 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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a corrosion-resistant sealing device capable of generating continuous axial fitting force by utilizing a Poisson effect, wherein a fifth screw extrudes a Poisson effect generating device to move downwards, the Poisson effect generating device provides downward extrusion force to a rubber sealing ring, the rubber sealing ring radially expands under the action of axial force and provides radial extrusion force to an expanded polytetrafluoroethylene sealing ring, and the expanded polytetrafluoroethylene sealing ring axially expands under the action of radial extrusion force and is tightly fitted with a shell part and a cover plate part to realize sealing; according to the invention, the expanded polytetrafluoroethylene sealing ring is continuously extruded by the rubber sealing ring, so that the expanded polytetrafluoroethylene sealing ring is kept to be permanently attached to a mechanical part, the defect of poor elasticity of the expanded polytetrafluoroethylene sealing ring is made up by the advantage of good elasticity of the rubber sealing ring, and the expanded polytetrafluoroethylene sealing ring realizes a permanent sealing effect.
Description
Technical Field
The invention belongs to the technical field of sealing devices, relates to a corrosion-resistant sealing device, and particularly relates to a corrosion-resistant sealing device capable of generating continuous axial fitting force by utilizing Poisson effect.
Background
The liquid-phase charging warhead is internally filled with high-energy fuel, the high-energy fuel is thrown into the air to be mixed with the air to form a large-range active cloud cluster under the explosive explosion throwing driving action, and the active cloud cluster generates body detonation and releases strong shock waves after secondary detonation of the explosive, so that the liquid-phase charging warhead is one of the most powerful non-nuclear weapons.
The high-energy fuel filled in the liquid-phase charging warhead contains liquid-phase materials, so that the sealing requirements at the interfaces of all mechanical parts of the liquid-phase charging warhead need to be met. The cover plate of the warhead of liquid charge adopts end face axial seal, the diameter of a seal groove is 335-338 mm, and the volume expansion pressure of liquid charge is not 0.35MPa.
The most common sealing material used on the warhead is rubber. The rubber has good elasticity, and can be elastically deformed under the action of pressure, so that the rubber and mechanical parts can be well attached to each other, and the sealing effect is realized.
The high-energy liquid fuel filled in the liquid-phase charging warhead has strong corrosivity, and various rubber materials are subjected to chemical reaction with the high-energy liquid fuel to lose effectiveness. The polytetrafluoroethylene is a high polymer material with excellent comprehensive performance, and does not react with high-energy liquid-phase fuel. However, PTFE is poorly compressible, with the elastic modulus of PTFE being 280MPa and the tensile strength of PTFE being 15MPa, i.e., the PTFE material will fail when it deforms more than 5.3% of its thickness. The rubber sealing ring has good elasticity, can be completely pressed into the sealing groove, and does not change the total length of all mechanical parts of the warhead after being assembled by using the rubber sealing ring. But the compressible volume of polytetrafluoroethylene sealing washer is too little, can not press in the seal groove completely, uses polytetrafluoroethylene sealing washer, and mechanical parts can be by jack-up, and the total length of warhead increases about 3 mm. The weapon platform has strict requirements on the total length of the liquid-phase charging warhead, and the error is usually within +/-0.5 mm, so that the requirement on the total length of the warhead cannot be met by using a polytetrafluoroethylene sealing ring.
Zhang Yu fruit et al reported a new polytetrafluoroethylene process in "development and application of expanded polytetrafluoroethylene" (the discussion of engineering plastics composite materials technology in 2014, page 321) by stretching polytetrafluoroethylene material into fibers to form expanded polytetrafluoroethylene material, which has the same chemical properties as polytetrafluoroethylene and does not react with high-energy liquid-phase fuel. But the elastic modulus of the expanded polytetrafluoroethylene is greatly reduced, the expanded polytetrafluoroethylene sealing ring has good compressibility, and the expanded polytetrafluoroethylene sealing ring can be completely pressed into the sealing groove without changing the total length of assembled mechanical parts of the warhead. However, the expanded polytetrafluoroethylene has poor resilience, i.e., is easily subjected to permanent deformation after being compressed, cannot be restored to the original size, cannot be permanently attached to mechanical parts, and is difficult to realize a permanent sealing effect.
Disclosure of Invention
In order to overcome the defects and defects of the prior art, the invention provides the corrosion-resistant sealing device which utilizes the Poisson effect to generate continuous axial attaching force.
The invention provides a corrosion-resistant sealing device for generating continuous axial fitting force by utilizing a Poisson effect. The device comprises a shell part 1 and a cover plate part 2, and is characterized by further comprising an expanded polytetrafluoroethylene sealing ring 3, a rubber sealing ring 4 and a Poisson effect generating device 5;
the shape of the shell part 1 is a first circular plate, the first circular plate of the shell part 1 is a revolving body, the center of the first circular plate of the shell part 1 is provided with a first round hole, the upper end of the first circular plate of the shell part 1 is provided with a first annular groove, the first annular groove of the shell part 1 is composed of a lower end surface, an inner side cylindrical surface and an outer side cylindrical surface, the diameter of the inner side cylindrical surface is smaller than that of the outer side cylindrical surface, the lower end surface of the first annular groove of the shell part 1 is a first concentric circular ring surface, the inner side cylindrical surface of the first annular groove of the shell part 1 is a first outer cylindrical surface, and the outer side cylindrical surface of the first annular groove of the shell part 1 is a first inner cylindrical surface;
the axis of the revolution body of the shell part 1 is vertical to the ground, the shell part 1 is a shell part of a liquid-phase charging warhead, the inner side of the shell part 1 is provided with liquid-phase fuel, the liquid-phase fuel has corrosivity, various rubber materials and the liquid-phase fuel are subjected to chemical reaction, and expanded polytetrafluoroethylene materials are not subjected to chemical reaction with the liquid-phase fuel;
the shape of the cover plate part 2 is a second circular plate, the second circular plate of the cover plate part 2 is a revolving body, the lower end of the second circular plate of the cover plate part 2 is provided with a second annular boss, the lower end of the second circular plate of the cover plate part 2 is provided with a second annular groove, the second annular groove of the cover plate part 2 is close to the second annular boss of the cover plate part 2 and is positioned at the outer side of the second annular boss, and the bottom surface of the second annular groove of the cover plate part 2 is provided with second threaded through holes which are uniformly distributed in the circumferential direction;
the axis of the revolving body of the cover plate part 2 is superposed with the axis of the revolving body of the shell part 1, the cover plate part 2 is positioned at the upper end of the shell part 1, the lower end face of a second circular plate of the cover plate part 2 is contacted with the upper end face of a first circular plate of the shell part 1, the edge of the second circular plate of the cover plate part 2 is mechanically connected with the shell part 1 through a second screw, a second annular boss of the cover plate part 2 is positioned in a first annular groove of the shell part 1, the inner side face of the second annular boss of the cover plate part 2 is contacted with a first outer cylindrical face of the shell part 1, and the diameter of the outer cylindrical face of the second annular groove of the cover plate part 2 is the same as the diameter of a first inner cylindrical face of the shell part 1;
the shape of the expanded polytetrafluoroethylene sealing ring 3 is a third circular ring body, the third circular ring body of the expanded polytetrafluoroethylene sealing ring 3 is a revolving body, the axial section of the third circular ring body of the expanded polytetrafluoroethylene sealing ring 3 is rectangular, and the expanded polytetrafluoroethylene sealing ring 3 is made of expanded polytetrafluoroethylene;
the revolving body axis of the expanded polytetrafluoroethylene sealing ring 3 is superposed with the revolving body axis of the cover plate part 2, the expanded polytetrafluoroethylene sealing ring 3 is positioned in a first annular groove of the shell part 1, the lower end face of a third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a first concentric annular surface of the shell part 1, the inner side face of the third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a first outer cylindrical surface of the shell part 1, and the upper end face of the third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a second annular boss of the cover plate part 2;
the shape of the rubber sealing ring 4 is a fourth torus, the fourth torus of the rubber sealing ring 4 is a revolving body, the axial section of the fourth torus of the rubber sealing ring 4 is circular, and the material of the rubber sealing ring 4 is rubber;
the axis of the revolving body of the rubber sealing ring 4 coincides with the axis of the revolving body of the cover plate part 2, the rubber sealing ring 4 is positioned in a first annular groove of the shell part 1, the rubber sealing ring 4 is positioned on the outer side of the expanded polytetrafluoroethylene sealing ring 3, the lower end of a fourth ring body of the rubber sealing ring 4 is contacted with a first concentric ring surface of the shell part 1, the inner side of the fourth ring body of the rubber sealing ring 4 is contacted with a first outer cylindrical surface of the shell part 1, and the outer side of the fourth ring body of the rubber sealing ring 4 is contacted with a first inner cylindrical surface of the shell part 1;
the poisson effect generating device 5 is in a fifth torus shape, the fifth torus of the poisson effect generating device 5 is a revolving body, the axial section of the fifth torus of the poisson effect generating device 5 is rectangular, and the poisson effect generating device 5 is made of aluminum;
the axis of a revolving body of the poisson effect generating device 5 is superposed with the axis of a revolving body of the cover plate part 2, the poisson effect generating device 5 is positioned in a second annular groove of the cover plate part 2, the inner side surface of a fifth ring body of the poisson effect generating device 5 is contacted with the inner side cylindrical surface of the second annular groove of the cover plate part 2, the outer side surface of the fifth ring body of the poisson effect generating device 5 is contacted with the outer side cylindrical surface of the second annular groove of the cover plate part 2, the lower end surface of the fifth ring body of the poisson effect generating device 5 is contacted with the upper end of a fourth ring body of the rubber sealing ring 4, a fifth screw is arranged in a second threaded through hole of the cover plate part 2, and the lower end of the fifth screw is contacted with the upper end surface of the fifth ring body of the poisson effect generating device 5;
the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 and the first inner cylindrical surface of the shell part 1 is A, and the ratio of the diameter of the fourth ring body axial section of the A to the diameter of the fourth ring body axial section of the rubber sealing ring 4 is 1:1.32 to 1.39;
after the fifth screw is screwed down, the distance between the lower end surface of the fifth torus of the poisson effect generating device 5 and the first concentric torus of the shell part 1 is B, and the ratio of the B to the circular diameter of the axial section of the fourth torus of the rubber sealing ring 4 is 1:1.46 to 1.51;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is 1:1.13 to 1.22;
the corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect comprises the following steps:
step 1: assembling the expanded polytetrafluoroethylene sealing ring 3 with the shell part 1;
and 2, step: assembling the rubber sealing ring 4 with the shell part 1;
and step 3: assembling the poisson effect generating device 5 with the cover plate part 2;
and 4, step 4: assembling the cover plate part 2 with the shell part 1 through a second screw;
and 5: the fifth screw is gradually screwed, the fifth screw gradually moves downwards, the fifth screw extrudes the Poisson effect generating device 5 to move downwards, the Poisson effect generating device 5 provides downward extrusion force for the rubber sealing ring 4, the rubber sealing ring 4 radially expands under the action of axial force and provides radial extrusion force for the expanded polytetrafluoroethylene sealing ring 3, and the expanded polytetrafluoroethylene sealing ring 3 axially expands under the action of radial extrusion force and is tightly attached to the shell part 1 and the cover plate part 2 to realize sealing.
Regarding the ratio of the axial cross-sectional circular diameter of the fourth ring of the rubber seal ring 4 to the axial cross-sectional circular diameter of the fourth ring of the B, and the ratio of the axial cross-sectional radial width of the third ring of the expanded polytetrafluoroethylene seal ring 3 to the axial cross-sectional circular diameter of the fourth ring of the rubber seal ring 4, any of the following 2 methods may be adopted:
implementation mode 1: the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 and the first inner cylindrical surface of the shell part 1 is A, and the ratio of the diameter of the fourth ring body axial section of the A to the diameter of the fourth ring body axial section of the rubber sealing ring 4 is 1:1.32;
after the fifth screw is screwed down, the distance between the lower end surface of the fifth torus of the poisson effect generating device 5 and the first concentric torus of the shell part 1 is B, and the ratio of the diameter of the fourth torus to the diameter of the fourth torus axial cross section of the rubber sealing ring 4 is 1:1.46;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is 1:1.13.
implementation mode 2: the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 and the first inner cylindrical surface of the shell part 1 is A, and the ratio of the A to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is 1:1.39;
after the fifth screw is screwed down, the distance between the lower end surface of the fifth torus of the poisson effect generating device 5 and the first concentric torus of the shell part 1 is B, and the ratio of the diameter of the fourth torus to the diameter of the fourth torus axial cross section of the rubber sealing ring 4 is 1:1.51;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is 1:1.22.
the corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect has the following technical effects:
the cover plate of the warhead of the liquid-phase charging is axially sealed by the end face, the diameter of the sealing groove is 335-338 mm, and the volume expansion pressure of the liquid-phase charging is not 0.35MPa. The rubber sealing ring is arranged on the outer side of the expanded polytetrafluoroethylene sealing ring, after the rubber sealing ring is compressed in the axial direction, the rubber sealing ring expands in the radial direction due to the Poisson effect, the expanded polytetrafluoroethylene sealing ring is provided with radial force by the rubber sealing ring after expanding in the radial direction, and after the expanded polytetrafluoroethylene sealing ring is subjected to the radial force, the expanded polytetrafluoroethylene sealing ring generates the axial force due to the Poisson effect and is tightly attached to a mechanical part, so that the sealing effect is realized. The resilience capability of the rubber sealing ring is good, the expanded polytetrafluoroethylene sealing ring is continuously extruded through the rubber sealing ring, so that the expanded polytetrafluoroethylene sealing ring is kept in lasting attachment with mechanical parts, the defect of poor elasticity of the expanded polytetrafluoroethylene sealing ring is compensated by the advantage of good elasticity of the rubber sealing ring, and the lasting sealing effect of the expanded polytetrafluoroethylene sealing ring is realized.
Drawings
Fig. 1 is a schematic view of a corrosion resistant seal utilizing the poisson effect to generate a continuous axial mating force. 1. The device comprises a shell part, a cover plate part, a 3 expanded polytetrafluoroethylene sealing ring, a 4 rubber sealing ring and a 5 Poisson effect generating device.
Detailed Description
The present invention is further described in detail with reference to the drawings and examples, it should be noted that the present invention is not limited to the following examples, and equivalent modifications based on the technical scheme of the present invention are within the scope of the present invention.
Example 1:
as shown in fig. 1, the present embodiment provides a corrosion resistant seal that utilizes the poisson effect to produce a continuous axial mating force. The device comprises a shell part 1 and a cover plate part 2, and is characterized by further comprising an expanded polytetrafluoroethylene sealing ring 3, a rubber sealing ring 4 and a Poisson effect generating device 5;
the shape of the shell part 1 is a first circular plate, the first circular plate of the shell part 1 is a revolving body, the center of the first circular plate of the shell part 1 is provided with a first round hole, the upper end of the first circular plate of the shell part 1 is provided with a first annular groove, the first annular groove of the shell part 1 is composed of a lower end surface, an inner side cylindrical surface and an outer side cylindrical surface, the diameter of the inner side cylindrical surface is smaller than that of the outer side cylindrical surface, the lower end surface of the first annular groove of the shell part 1 is a first concentric circular ring surface, the inner side cylindrical surface of the first annular groove of the shell part 1 is a first outer cylindrical surface, and the outer side cylindrical surface of the first annular groove of the shell part 1 is a first inner cylindrical surface;
the axis of the revolution body of the shell part 1 is vertical to the ground, the shell part 1 is a shell part of a liquid-phase charging warhead, the inner side of the shell part 1 is provided with liquid-phase fuel, the liquid-phase fuel has corrosivity, various rubber materials and the liquid-phase fuel are subjected to chemical reaction, and expanded polytetrafluoroethylene materials are not subjected to chemical reaction with the liquid-phase fuel;
the shape of the cover plate part 2 is a second circular plate, the second circular plate of the cover plate part 2 is a revolving body, the lower end of the second circular plate of the cover plate part 2 is provided with a second annular boss, the lower end of the second circular plate of the cover plate part 2 is provided with a second annular groove, the second annular groove of the cover plate part 2 is close to the second annular boss of the cover plate part 2 and is positioned at the outer side of the second annular boss, and the bottom surface of the second annular groove of the cover plate part 2 is provided with second threaded through holes which are uniformly distributed in the circumferential direction;
the axis of the revolving body of the cover plate part 2 is superposed with the axis of the revolving body of the shell part 1, the cover plate part 2 is positioned at the upper end of the shell part 1, the lower end face of a second circular plate of the cover plate part 2 is contacted with the upper end face of a first circular plate of the shell part 1, the edge of the second circular plate of the cover plate part 2 is mechanically connected with the shell part 1 through a second screw, a second annular boss of the cover plate part 2 is positioned in a first annular groove of the shell part 1, the inner side face of the second annular boss of the cover plate part 2 is contacted with a first outer cylindrical face of the shell part 1, and the diameter of the outer cylindrical face of the second annular groove of the cover plate part 2 is the same as the diameter of a first inner cylindrical face of the shell part 1;
the shape of the expanded polytetrafluoroethylene sealing ring 3 is a third circular ring body, the third circular ring body of the expanded polytetrafluoroethylene sealing ring 3 is a revolving body, the axial section of the third circular ring body of the expanded polytetrafluoroethylene sealing ring 3 is rectangular, and the expanded polytetrafluoroethylene sealing ring 3 is made of expanded polytetrafluoroethylene;
the revolving body axis of the expanded polytetrafluoroethylene sealing ring 3 is superposed with the revolving body axis of the cover plate part 2, the expanded polytetrafluoroethylene sealing ring 3 is positioned in a first annular groove of the shell part 1, the lower end face of a third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a first concentric annular surface of the shell part 1, the inner side face of the third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a first outer cylindrical surface of the shell part 1, and the upper end face of the third annular body of the expanded polytetrafluoroethylene sealing ring 3 is contacted with a second annular boss of the cover plate part 2;
the rubber sealing ring 4 is a fourth torus, the fourth torus of the rubber sealing ring 4 is a revolving body, the axial section of the fourth torus of the rubber sealing ring 4 is circular, and the rubber sealing ring 4 is made of rubber;
the rotation body axis of the rubber sealing ring 4 is coincident with the rotation body axis of the cover plate part 2, the rubber sealing ring 4 is positioned in a first annular groove of the shell part 1, the rubber sealing ring 4 is positioned on the outer side of the expanded polytetrafluoroethylene sealing ring 3, the lower end of a fourth annular body of the rubber sealing ring 4 is contacted with a first concentric annular surface of the shell part 1, the inner side of the fourth annular body of the rubber sealing ring 4 is contacted with a first outer cylindrical surface of the shell part 1, and the outer side of the fourth annular body of the rubber sealing ring 4 is contacted with a first inner cylindrical surface of the shell part 1;
the poisson effect generating device 5 is in a fifth ring body shape, the fifth ring body of the poisson effect generating device 5 is a revolving body, the axial section of the fifth ring body of the poisson effect generating device 5 is rectangular, and the poisson effect generating device 5 is made of aluminum;
the axis of a revolving body of the poisson effect generating device 5 is superposed with the axis of a revolving body of the cover plate part 2, the poisson effect generating device 5 is positioned in a second annular groove of the cover plate part 2, the inner side surface of a fifth ring body of the poisson effect generating device 5 is contacted with the inner side cylindrical surface of the second annular groove of the cover plate part 2, the outer side surface of the fifth ring body of the poisson effect generating device 5 is contacted with the outer side cylindrical surface of the second annular groove of the cover plate part 2, the lower end surface of the fifth ring body of the poisson effect generating device 5 is contacted with the upper end of a fourth ring body of the rubber sealing ring 4, a fifth screw is arranged in a second threaded through hole of the cover plate part 2, and the lower end of the fifth screw is contacted with the upper end surface of the fifth ring body of the poisson effect generating device 5;
the using method and the working principle of the invention are as follows:
the corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect comprises the following steps:
step 1: assembling the expanded polytetrafluoroethylene sealing ring 3 with the shell part 1;
and 2, step: assembling the rubber sealing ring 4 with the shell part 1;
and step 3: assembling the Poisson effect generating device 5 and the cover plate part 2;
and 4, step 4: assembling the cover plate part 2 with the shell part 1 through a second screw;
and 5: the fifth screw is gradually screwed, the fifth screw gradually moves downwards, the fifth screw extrudes the Poisson effect generating device 5 to move downwards, the Poisson effect generating device 5 provides downward extrusion force for the rubber sealing ring 4, the rubber sealing ring 4 radially expands under the action of axial force and provides radial extrusion force for the expanded polytetrafluoroethylene sealing ring 3, and the expanded polytetrafluoroethylene sealing ring 3 axially expands under the action of radial extrusion force and is tightly attached to the shell part 1 and the cover plate part 2 to realize sealing.
The working principle of the invention is as follows:
the expanded polytetrafluoroethylene sealing ring 3 has the advantages of strong corrosion resistance, and the expanded polytetrafluoroethylene sealing ring 3 has the defect of poor resilience, is easy to generate permanent deformation, lose elasticity and lose sealing effect once being compressed by strong force. The rubber sealing ring 4 has the advantages of strong resilience, elastic deformation after compression, permanent elasticity maintenance, permanent close fit with parts in contact and retention of the closing force, and poor corrosion resistance. The expanded polytetrafluoroethylene sealing ring 3 and the rubber sealing ring 4 are combined, the advantages of the expanded polytetrafluoroethylene sealing ring 3 and the advantages of the rubber sealing ring 4 are simultaneously exerted, and the defects of the expanded polytetrafluoroethylene sealing ring 3 and the rubber sealing ring 4 are simultaneously avoided. Specifically, the expanded polytetrafluoroethylene sealing ring 3 is in contact with corrosive fuel on the inner side, so that the advantage of corrosion resistance of the expanded polytetrafluoroethylene sealing ring 3 is exerted, and the corrosive liquid fuel is sealed by the expanded polytetrafluoroethylene sealing ring 3. The corrosive liquid fuel cannot be contacted with the rubber seal ring 4 again after being sealed, so that the rubber seal ring 4 cannot be corroded. Rubber seal 4 can keep permanent resilience ability after being compressed, by rubber seal 4 and 3 extrusion contact of expanded polytetrafluoroethylene sealing washer, and the extrusion force that provides that lasts, make expanded polytetrafluoroethylene sealing washer 3 just lose resilience ability, also have 4 permanent extrusion expanded polytetrafluoroethylene sealing washers 3 of rubber seal, and through the poisson effect, make 3 permanent keeping of expanded polytetrafluoroethylene sealing washer and metal parts's the power of pressing close to, thereby realize permanent sealed effect.
The annular gap between the outer side surface of the third annular body of the expanded polytetrafluoroethylene sealing ring 3 and the first inner cylindrical surface of the shell part 1 is A, when the ratio of the diameter of the third annular body to the diameter of the fourth annular body axial section of the rubber sealing ring 4 is too small, the filling space of the rubber sealing ring 4 is too narrow, the rubber sealing ring 4 needs to generate larger radial deformation after being forcibly filled, and the rubber sealing ring 4 is damaged by too large radial deformation to lose the effect; when the ratio of the diameter of the fourth ring body axial section of the rubber sealing ring 4 to the diameter of the fourth ring body axial section of the A is too large, the filling space of the rubber sealing ring 4 is too wide, and the radial extrusion force applied to the rubber sealing ring 4 after being filled is too small, so that the initial radial extrusion force of the rubber sealing ring 4 to the expanded polytetrafluoroethylene sealing ring 3 is too small, which causes the waste of the extrusion space of the expanded polytetrafluoroethylene sealing ring 3 by the rubber sealing ring 4, and reduces the effect of the invention. Through a large number of experiments, the ratio of the diameter of the fourth ring body axis section circle of the rubber sealing ring 4 to the diameter of the fourth ring body axis section circle of the A is 1: 1.32-1.39, the problems can be avoided, and the functions can be realized to meet the use requirements.
In this embodiment, the ratio of the diameter of the fourth ring body axis cross section of the rubber seal ring 4 to the diameter of the fourth ring body axis cross section is 1:1.32;
after the fifth screw is screwed down, the distance between the lower end surface of the fifth ring body of the poisson effect generating device 5 and the first concentric ring surface of the shell part 1 is B, and when the ratio of the diameter of the fifth ring body to the circular cross section of the fourth ring body of the rubber sealing ring 4 is too small, the axial extrusion degree of the rubber sealing ring 4 is too large, so that extrusion damage is easily caused, and the function is lost; b is when too big with the ratio of the circular diameter of fourth ring body axis cross-section of rubber seal 4, the axial extrusion degree of rubber seal 4 is too little, the radial expansive force that rubber seal 4 produced is too little, the radial extrusion force that expanded polytetrafluoroethylene sealing washer 3 received is too little, in case take place permanent deformation, rubber seal 4 is not enough to the extrusion degree of expanded polytetrafluoroethylene sealing washer 3, can't maintain permanent sealed effect, discover through a large amount of experiments, the ratio of the circular diameter of fourth ring body axis cross-section of B and rubber seal 4 is 1: 1.46-1.51, the above problems can be avoided, and the above functions can be realized, thereby meeting the use requirements.
In this embodiment, the ratio of the diameter of the fourth ring body axis cross-section of the rubber seal ring 4 to the diameter of the fourth ring body axis cross-section is 1:1.46;
when the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is too small, the size of the rubber sealing ring 4 is too large, so that the expanded polytetrafluoroethylene sealing ring occupies too large space and cannot be used in a fighting part with a tense size; when the ratio of the radial width of the third ring body axial cross section of expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the fourth ring body axial cross section of rubber sealing ring 4 is too large, the size of rubber sealing ring 4 is too small, the continuous compression amount of rubber sealing ring 4 to expanded polytetrafluoroethylene sealing ring 3 becomes small, the permanent deformation amount of expandable polytetrafluoroethylene sealing ring 3 which can be adjusted is too small, once the resilience amount of rubber sealing ring 4 is insufficient, expanded polytetrafluoroethylene sealing ring 3 is not compressed after being loosened in permanent deformation, expanded polytetrafluoroethylene sealing ring 3 cannot be tightly attached to the contacted metal part, and leakage is caused. Through a large number of experiments, the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring 3 to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring 4 is 1: 1.13-1.22, the problems can be avoided, and the functions can be realized to meet the use requirements.
In this embodiment, the ratio of the radial width of the axial cross-section of the third ring of the expanded ptfe sealing ring 3 to the circular diameter of the axial cross-section of the fourth ring of the rubber sealing ring 4 is 1:1.13;
the method is used for processing 20 liquid-phase charging warhead end faces and axially sealing the end faces, the diameter of a sealing groove is 335-338 mm, liquid-phase fuel is filled inside the sealing groove, the temperature is raised to 70 ℃, and the maximum value of the volume expansion pressure of the liquid-phase charging reaches 0.35MPa. The sealing performance is checked after 3 months, and no leakage occurs at 20 warheads. The sealing performance of the invention is proved to be reliable.
The corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect has the following technical effects:
the cover plate of the warhead of the liquid charge is axially sealed by the end face, the diameter of the sealing groove is 335-338 mm, and the volume expansion pressure of the liquid charge is not 0.35MPa. The rubber sealing ring is arranged on the outer side of the expanded polytetrafluoroethylene sealing ring, after the rubber sealing ring is compressed in the axial direction, the rubber sealing ring expands in the radial direction due to the Poisson effect, the expanded polytetrafluoroethylene sealing ring is provided with radial force by the rubber sealing ring after expanding in the radial direction, and after the expanded polytetrafluoroethylene sealing ring is subjected to the radial force, the expanded polytetrafluoroethylene sealing ring generates the axial force due to the Poisson effect and is tightly attached to a mechanical part, so that the sealing effect is realized. The rubber seal ring has good resilience, and the expanded polytetrafluoroethylene seal ring is continuously extruded by the rubber seal ring, so that the expanded polytetrafluoroethylene seal ring is kept in lasting attachment with mechanical parts, the defect of poor elasticity of the expanded polytetrafluoroethylene seal ring is made up by the advantage of good elasticity of the rubber seal ring, and the lasting sealing effect of the expanded polytetrafluoroethylene seal ring is realized.
Example 2:
example 2 differs from example 1 in that:
in this embodiment, the ratio of the diameter of the fourth ring body axis cross section of the rubber seal ring 4 to the diameter of the fourth ring body axis cross section is 1:1.39;
in this embodiment, the ratio of the diameter of the fourth ring body axis cross-section of the rubber seal ring 4 to the diameter of the fourth ring body axis cross-section is 1:1.51;
in this embodiment, the ratio of the radial width of the axial cross section of the third ring of the expanded ptfe seal ring 3 to the circular diameter of the axial cross section of the fourth ring of the rubber seal ring 4 is 1:1.22;
the method is used for processing 20 liquid-phase charging warhead end faces and axially sealing the end faces, the diameter of a sealing groove is 335-338 mm, liquid-phase fuel is filled inside the sealing groove, the temperature is raised to 70 ℃, and the maximum value of the volume expansion pressure of the liquid-phase charging reaches 0.35MPa. The sealing performance is checked after 3 months, and no leakage occurs at 20 warheads. The sealing performance of the invention is proved to be reliable.
The corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect has the following technical effects:
the cover plate of the warhead of the liquid-phase charging is axially sealed by the end face, the diameter of the sealing groove is 335-338 mm, and the volume expansion pressure of the liquid-phase charging is not 0.35MPa. The rubber sealing ring is arranged on the outer side of the expanded polytetrafluoroethylene sealing ring, after the rubber sealing ring is compressed in the axial direction, the rubber sealing ring expands in the radial direction due to the Poisson effect, the expanded polytetrafluoroethylene sealing ring is provided with radial force by the rubber sealing ring after expanding in the radial direction, and after the expanded polytetrafluoroethylene sealing ring is subjected to the radial force, the expanded polytetrafluoroethylene sealing ring generates the axial force due to the Poisson effect and is tightly attached to a mechanical part, so that the sealing effect is realized. The resilience capability of the rubber sealing ring is good, the expanded polytetrafluoroethylene sealing ring is continuously extruded through the rubber sealing ring, so that the expanded polytetrafluoroethylene sealing ring is kept in lasting attachment with mechanical parts, the defect of poor elasticity of the expanded polytetrafluoroethylene sealing ring is compensated by the advantage of good elasticity of the rubber sealing ring, and the lasting sealing effect of the expanded polytetrafluoroethylene sealing ring is realized.
Claims (3)
1. A corrosion-resistant sealing device for generating continuous axial fitting force by utilizing Poisson effect comprises a shell part (1) and a cover plate part (2), and is characterized by also comprising an expanded polytetrafluoroethylene sealing ring (3), a rubber sealing ring (4) and a Poisson effect generating device (5);
the shell part (1) is in a first circular plate shape, the first circular plate of the shell part (1) is a revolving body, the center of the first circular plate of the shell part (1) is provided with a first round hole, the upper end of the first circular plate of the shell part (1) is provided with a first annular groove, the first annular groove of the shell part (1) consists of a lower end surface, an inner side cylindrical surface and an outer side cylindrical surface, the diameter of the inner side cylindrical surface is smaller than that of the outer side cylindrical surface, the lower end surface of the first annular groove of the shell part (1) is a first concentric circular ring surface, the inner side cylindrical surface of the first annular groove of the shell part (1) is a first outer cylindrical surface, and the outer side cylindrical surface of the first annular groove of the shell part (1) is a first inner cylindrical surface;
the axial line of a revolving body of the shell part (1) is vertical to the ground, the shell part (1) is a shell part of a liquid-phase charging warhead, liquid-phase fuel is arranged on the inner side of the shell part (1) and has corrosiveness, the sealing device seals a first circular hole of the shell part (1) to prevent the liquid-phase fuel from leaking from the first circular hole of the shell part (1), the diameter of a first inner cylindrical surface of a first annular groove of the shell part (1) is 335-338 mm, and the volume expansion pressure of the liquid-phase fuel is not more than 0.35MPa;
the shape of the cover plate part (2) is a second circular plate, the second circular plate of the cover plate part (2) is a revolving body, the lower end of the second circular plate of the cover plate part (2) is provided with a second annular boss, the lower end of the second circular plate of the cover plate part (2) is provided with a second annular groove, the second annular groove of the cover plate part (2) is close to the second annular boss of the cover plate part (2) and is positioned at the outer side of the second annular boss, and the bottom surface of the second annular groove of the cover plate part (2) is provided with second threaded through holes which are uniformly distributed in the circumferential direction;
the revolving body axis of the cover plate part (2) is superposed with the revolving body axis of the shell part (1), the cover plate part (2) is positioned at the upper end of the shell part (1), the lower end face of a second circular plate of the cover plate part (2) is contacted with the upper end face of a first circular plate of the shell part (1), the edge of the second circular plate of the cover plate part (2) is mechanically connected with the shell part (1) through a second screw, a second annular boss of the cover plate part (2) is positioned in a first annular groove of the shell part (1), the inner side face of the second annular boss of the cover plate part (2) is contacted with a first outer cylindrical face of the shell part (1), and the diameter of the outer side cylindrical face of the second annular groove of the cover plate part (2) is the same as the diameter of a first inner cylindrical face of the shell part (1);
the shape of the expanded polytetrafluoroethylene sealing ring (3) is a third circular ring body, the third circular ring body of the expanded polytetrafluoroethylene sealing ring (3) is a revolving body, the axial section of the third circular ring body of the expanded polytetrafluoroethylene sealing ring (3) is rectangular, and the expanded polytetrafluoroethylene sealing ring (3) is made of expanded polytetrafluoroethylene;
the revolution body axis of the expanded polytetrafluoroethylene sealing ring (3) is superposed with the revolution body axis of the cover plate part (2), the expanded polytetrafluoroethylene sealing ring (3) is positioned in a first annular groove of the shell part (1), the lower end face of a third ring body of the expanded polytetrafluoroethylene sealing ring (3) is contacted with a first concentric circular ring surface of the shell part (1), the inner side face of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) is contacted with a first outer cylindrical surface of the shell part (1), and the upper end face of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) is contacted with a second annular boss of the cover plate part (2);
the shape of the rubber sealing ring (4) is a fourth torus, the fourth torus of the rubber sealing ring (4) is a revolving body, the axial section of the fourth torus of the rubber sealing ring (4) is circular, and the rubber sealing ring (4) is made of rubber;
the axis of a revolving body of the rubber sealing ring (4) coincides with the axis of a revolving body of the cover plate part (2), the rubber sealing ring (4) is positioned in a first annular groove of the shell part (1), the rubber sealing ring (4) is positioned on the outer side of the expanded polytetrafluoroethylene sealing ring (3), the lower end of a fourth annular body of the rubber sealing ring (4) is in contact with a first concentric annular surface of the shell part (1), the inner side of the fourth annular body of the rubber sealing ring (4) is in contact with a first outer cylindrical surface of the shell part (1), and the outer side of the fourth annular body of the rubber sealing ring (4) is in contact with a first inner cylindrical surface of the shell part (1);
the poisson effect generating device (5) is in a fifth torus shape, the fifth torus of the poisson effect generating device (5) is a revolving body, the axial section of the fifth torus of the poisson effect generating device (5) is rectangular, and the poisson effect generating device (5) is made of aluminum;
the axis of a revolving body of the Poisson effect generating device (5) is superposed with the axis of a revolving body of the cover plate part (2), the Poisson effect generating device (5) is positioned in a second annular groove of the cover plate part (2), the inner side surface of a fifth ring body of the Poisson effect generating device (5) is contacted with the inner side cylindrical surface of the second annular groove of the cover plate part (2), the outer side surface of the fifth ring body of the Poisson effect generating device (5) is contacted with the outer side of the second annular groove of the cover plate part (2), the lower end surface of the fifth ring body of the Poisson effect generating device (5) is contacted with the upper end of a fourth ring body of the rubber sealing ring (4), a fifth screw is arranged in a second threaded through hole of the cover plate part (2), and the lower end of the fifth screw is contacted with the upper end surface of the fifth ring body of the Poisson effect generating device (5);
the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) and the first inner cylindrical surface of the shell part (1) is A, and the ratio of the A to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.32 to 1.39;
after the fifth screw is screwed down, the distance between the lower end face of a fifth ring body of the Poisson effect generating device (5) and the first concentric ring surface of the shell part (1) is B, and the ratio of the B to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.46 to 1.51;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.13 to 1.22;
the corrosion-resistant sealing device for generating continuous axial fitting force by utilizing the Poisson effect comprises the following steps:
step 1: assembling the expanded polytetrafluoroethylene sealing ring (3) with the shell part (1);
and 2, step: assembling the rubber sealing ring (4) with the shell part (1);
and step 3: assembling the Poisson effect generating device (5) with the cover plate part (2);
and 4, step 4: assembling the cover plate part (2) with the shell part (1) through a second screw;
and 5: the fifth screw is gradually screwed, the fifth screw gradually moves downwards, the fifth screw extrudes the Poisson effect generating device (5) to move downwards, the Poisson effect generating device (5) provides downward extrusion force for the rubber sealing ring (4), the rubber sealing ring (4) radially expands under the action of axial force and provides radial extrusion force for the expanded polytetrafluoroethylene sealing ring (3), and the expanded polytetrafluoroethylene sealing ring (3) axially expands under the action of radial extrusion force and is tightly attached to the shell part (1) and the cover plate part (2) to realize sealing.
2. The corrosion-resistant sealing device for generating continuous axial fitting force by utilizing Poisson effect as claimed in claim 1, wherein the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) and the first inner cylindrical surface of the housing part (1) is A, and the ratio of A to the fourth ring body axial cross-section circular diameter of the rubber sealing ring (4) is 1:1.32;
after the fifth screw is screwed down, the distance between the lower end face of a fifth ring body of the Poisson effect generating device (5) and the first concentric ring surface of the shell part (1) is B, and the ratio of the B to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.46 of;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.13.
3. the corrosion-resistant sealing device for generating continuous axial fitting force by utilizing Poisson effect as claimed in claim 1, wherein the annular gap width between the outer side surface of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) and the first inner cylindrical surface of the housing part (1) is A, and the ratio of A to the fourth ring body axial cross-section circular diameter of the rubber sealing ring (4) is 1:1.39;
after the fifth screw is screwed down, the distance between the lower end face of a fifth ring body of the Poisson effect generating device (5) and the first concentric ring surface of the shell part (1) is B, and the ratio of the B to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.51;
the ratio of the radial width of the axial section of the third ring body of the expanded polytetrafluoroethylene sealing ring (3) to the circular diameter of the axial section of the fourth ring body of the rubber sealing ring (4) is 1:1.22.
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| CN113864452B (en) * | 2021-08-30 | 2023-01-13 | 西安近代化学研究所 | Corrosion-resistant leakage-proof device for realizing full-space isobaric stress state through free movement of sealing ring |
| CN113847428B (en) * | 2021-08-30 | 2023-01-17 | 西安近代化学研究所 | Balanced pressure sealing device |
| CN115217976B (en) * | 2022-07-22 | 2024-05-10 | 西安近代化学研究所 | Radial sealing device suitable for circular cross section polytetrafluoroethylene sealing washer |
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| SE521231C2 (en) * | 1998-07-02 | 2003-10-14 | Ericsson Telefon Ab L M | Slow expanding gasket and method of use thereof |
| DE8717108U1 (en) * | 1987-12-30 | 1988-02-18 | W. L. Gore & Co. Gmbh, 8835 Pleinfeld, De | |
| US5792525A (en) * | 1995-03-31 | 1998-08-11 | W. L. Gore & Associates, Inc. | Creep resistant shaped article of densified expanded polytetrafluoroethylene |
| CN203743488U (en) * | 2014-03-15 | 2014-07-30 | 永嘉县新然阀门有限公司 | Fixed ball valve |
| CN105020430A (en) * | 2015-07-23 | 2015-11-04 | 苏州科迪流体控制设备有限公司 | Ball valve |
| CN205835904U (en) * | 2016-06-28 | 2016-12-28 | 中山市恒兴机械制造有限公司 | A kind of hydraulic screen replacing device |
| CN211010365U (en) * | 2019-10-30 | 2020-07-14 | 秦皇岛北方管业有限公司 | Sealing nonmetal expansion joint |
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