CN109944894B - Sealing structure, method and product of sub-opening on low-temperature-resistant air spring - Google Patents
Sealing structure, method and product of sub-opening on low-temperature-resistant air spring Download PDFInfo
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- CN109944894B CN109944894B CN201910353905.XA CN201910353905A CN109944894B CN 109944894 B CN109944894 B CN 109944894B CN 201910353905 A CN201910353905 A CN 201910353905A CN 109944894 B CN109944894 B CN 109944894B
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- 238000007789 sealing Methods 0.000 title claims abstract description 259
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 48
- 238000007906 compression Methods 0.000 claims abstract description 48
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 238000010030 laminating Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 25
- 229920001971 elastomer Polymers 0.000 description 25
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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Abstract
The utility model provides a sealing structure of sub-mouth on resistant low temperature air spring, including upper cover plate, the buckle, connecting bolt and last sub-mouth, go up sub-mouth compression between upper cover plate and buckle, buckle and connecting bolt all set up in the radial outside of last sub-mouth, the bag body of going up sub-mouth below is laminated with the buckle inner wall and is down along laminating to the buckle bottom surface, go up between cover plate and the last sub-mouth and go up between sub-mouth and the buckle and all adopt radial seal and axial seal to set up in turn and the seal structure who connects gradually, at least one axial seal on the upper sub-mouth is towards the inboard direction of keeping away from connecting bolt to the sealing pressure of upper cover plate, and its sealing pressure and compression volume increase along with air spring's loading and displacement. The invention ensures the sealing reliability of the upper sub-opening of the air spring in the loading process, realizes the effective sealing of the upper sub-opening in the low-temperature state, and meets the sealing requirement of the air spring in the low-temperature state. The invention also provides a sealing method of the sub-opening of the low-temperature-resistant air spring and the low-temperature-resistant air spring.
Description
Technical Field
The invention relates to a sealing structure, a sealing method and a sealing product for a sub-opening of a low-temperature-resistant air spring, which realize effective sealing of the air spring in a low-temperature state.
Background
The sealing of the upper seam allowance of the air spring for track traffic mainly depends on that the upper seam allowance of the air bag is fixed between the upper cover plate and the retaining ring through a certain number of screws. The purpose of compressing the rubber of the air bag upper seam allowance is achieved through the tightening force exerted by the screw, so that the sealing performance of the air bag upper seam allowance is achieved.
With the development of rail transportation industry, air spring products are increasingly used in various alpine regions, but due to the fact that rubber of an air spring air bag is subjected to cold shrinkage in a low-temperature alpine environment, the compression amount of an air spring upper sub-opening at the sealing surface of an upper cover plate is reduced, and particularly under the condition that the air bag is subjected to large load and horizontal displacement, the air leakage problem of the air spring upper sub-opening at the sealing surface of the upper cover plate is quite common. The common practice is to improve the rubber formula and reduce the influence of low temperature on the rubber performance, but at the low temperature of-50 ℃, the problem of low-temperature air leakage cannot be solved by simply improving the air spring air bag rubber, and a new sealing structure needs to be matched and designed.
CN201610103238, by designing an emergency spring on the upper part of the hourglass spring inside the air spring, the rigidity of the emergency spring is reduced in a mode of connecting the emergency spring and the hourglass spring in series, and a limiting pressing plate is designed to limit the lateral displacement, so as to solve the problem that the rigidity of the conventional air spring is increased at low temperature, but the patent does not mention how to solve the problem of air leakage of the air spring at the position of the air bag upper seam and the upper cover plate in a high-cold low-temperature environment.
CN201420499038 discloses an air spring system for a high-cold vehicle, and the scheme of low-temperature air leakage for the upper seam allowance is that sealing ribs similar to O-shaped rings are designed on the upper surface of the upper seam allowance of an air bag. The number of the sealing ribs is 2-4 circles, the size of the sealing ribs is 1.5-3mm, but the sealing ribs only increase the compression amount in the up-down direction by virtue of the sealing ribs, so that the problem of air leakage caused by rubber shrinkage at the low temperature of minus 40 ℃ is solved, the matching position of the upper cover plate is still the same as that of a conventional air spring, and only one sealing plane is provided.
WO2015/139854A1 uses the low temperature resistance of silicone rubber to achieve air tightness of the air spring at low temperature by placing a silicone rubber O-ring outside the mating part of the upper cover plate and the air bag. This solution requires a large space for placing the silicone rubber O-ring at the junction of the outside of the balloon and the screw. The size of the joint between the outer side of the air bag and the screw is small, the space is tense, the O-shaped ring cannot be placed, and the problem of low-temperature air leakage cannot be solved.
CN106641079a, the sealing ring of the air bag upper sub-opening is pressed by the upper cover plate and the snap ring, so that the sealing ring of the air bag upper sub-opening forms interference compression, thereby realizing the sealing of the air bag upper sub-opening. According to the scheme, only the sealing ring which is positioned on the same surface as the original sealing surface is added, but the phenomena of creep of rubber of the air bag and cold shrinkage of the body rubber cannot be solved, the problem that the air leakage is likely to occur due to the fact that the compression amount of the upper sub-opening of the air spring is reduced at the sealing surface of the upper cover plate after the air spring is used for a period of time is solved, and the sealing ring of the upper sub-opening needs to be placed at the joint of the outer side of the air bag and the screw.
Disclosure of Invention
According to the low-temperature-resistant air spring upper sub-opening sealing structure, the sealing performance between the upper sub-opening and the upper cover plate is improved, and the sealing reliability of the air spring upper sub-opening in the loading process is ensured; the sealing device has the advantages that the effective sealing of the upper sub-opening in the low-temperature state is realized, the influence of the reduction of sealing pressure caused by rubber shrinkage in the low-temperature state is counteracted, the sealing requirement of the air spring in the low-temperature state is met, and the sealing reliability and the use reliability of the air spring in the low-temperature state are improved. The invention also provides a sealing method of the sub-opening of the low-temperature-resistant air spring and the low-temperature-resistant air spring.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a sealing structure of low temperature resistant air spring upper sub-mouth, includes the upper cover plate, hugs closely the buckle of upper cover plate bottom surface, connects the connecting bolt of upper cover plate and buckle and the last sub-mouth of gasbag, goes up sub-mouth compression between upper cover plate and buckle, buckle and connecting bolt all set up in the radial outside of sub-mouth, the bag body of upper sub-mouth below is laminated and is followed down along laminating to the buckle bottom surface with the buckle inner wall, its characterized in that between upper cover plate and the upper sub-mouth and go up and all adopt radial seal and axial seal to set up in turn and the sealing structure who connects gradually between sub-mouth and the buckle, at least one axial seal on the upper sub-mouth is towards the inboard direction of keeping away from connecting bolt towards the sealing pressure of upper cover plate, and its sealing pressure and compression volume increase along with air spring's loading and displacement.
Preferably, the snap ring is provided with an annular snap ring groove and a snap ring protrusion positioned at the inner side of the snap ring groove, and the bottom of the upper sub-mouth is provided with a bottom protrusion corresponding to the snap ring groove and a bottom groove corresponding to the snap ring protrusion;
the bottom bulge is pressed into the buckle groove, the side surface of the bottom bulge is bonded and pressed with the side surface of the buckle groove to form axial seal between the upper sub-opening and the buckle, and the bottom surface of the bottom bulge is bonded and pressed with the convex-concave groove bottom surface of the buckle to form radial seal between the upper sub-opening and the buckle;
the raised side of the snap ring is pressed into the bottom groove, the raised side of the snap ring is bonded and pressed with the side of the bottom groove to form axial seal between the upper sub-opening and the snap ring, and the raised top surface of the snap ring is bonded and pressed with the top surface of the bottom groove to form radial seal between the upper sub-opening and the snap ring.
Preferably, the bottom surface of the bottom bulge is a radial plane, the top surface of the bottom groove is an arc surface, and the radial width of the bottom bulge is two to three times of the radial width of the bottom groove.
Preferably, the top surface of the upper sub-opening is provided with a radial sealing surface in radial sealing fit with the bottom surface of the upper cover plate and an axial sealing surface in axial sealing fit with the bottom surface of the upper cover plate, the bottom surface of the upper cover plate is provided with a radial sealing fit surface in sealing fit with the radial sealing surface and an axial sealing fit surface in sealing fit with the axial sealing surface, the radial sealing surfaces and the axial sealing surfaces are alternately arranged and sequentially connected, the number of the axial sealing surfaces is at least one, the number of the radial sealing surfaces is at least two, and the sealing pressure of at least one axial sealing surface faces the inner side direction far away from the connecting bolt.
Preferably, the number of the radial matching surfaces is two, one axial matching surface is arranged between the two radial matching surfaces, the height of the radial matching surface arranged on the inner side of the axial matching surface is lower than that of the radial matching surface arranged on the outer side of the axial matching surface, the axial matching surface is connected with the radial matching surface arranged on the outer side of the axial matching surface to form a top surface bulge, the axial sealing matching surface is connected with the radial sealing matching surface to form an upper cover plate groove matched with the top surface bulge, and the axial compression amount of the top surface bulge in the upper cover plate groove is larger than 1mm.
Preferably, the top surface bulge and the upper cover plate groove between have the heating deformation space I, the heating deformation space be located between the lateral wall of upper sub-mouth lateral wall and the upper cover plate groove, have the heating deformation space II between upper sub-mouth and the buckle, the heating deformation space II is located between upper sub-mouth lateral wall and the buckle groove lateral wall, and the heating deformation space I and the heating deformation space II are UNICOM about and the width is equal.
Preferably, the number of the axial matching surfaces and the axial sealing matching surfaces is two, a radial matching surface is connected between the two axial matching surfaces to form a top surface bulge, a radial sealing matching surface is connected between the two axial sealing matching surfaces to form an upper cover plate groove, and a heating deformation gap III extending to the outer side surface of the upper sub-opening is arranged between the upper cover ring and the retaining ring.
Preferably, the inner diameter of the buckle ring groove is larger than that of the upper cover plate groove, the outer diameter of the buckle ring groove is equal to or larger than that of the upper cover plate groove, and the depth of the upper cover plate groove is 2-5mm.
The sealing method of the sub-mouth on the low-temperature-resistant air spring adopts the sealing structure of the sub-mouth on the low-temperature-resistant air spring, and is characterized in that:
the upper sub-opening is sealed alternately in the radial direction and the axial direction through a sealing structure between the upper cover plate and the upper sub-opening and between the upper sub-opening and the retaining ring;
when the air spring is loaded and displaced, the upper opening is pulled towards the inner side direction far away from the connecting bolt, and the sealing pressure and the compression amount of the axial sealing surface, which is applied to the upper opening and is applied to the sealing pressure towards the inner side direction far away from the connecting bolt, of the upper cover plate are increased, so that the sealing performance between the upper opening and the upper cover plate is improved;
the compression amount of the upper sub-opening between the upper cover plate and the retaining ring is designed, so that the cold-receiving shrinkage amount of the upper sub-opening of the air spring is smaller than the axial compression amount of the upper sub-opening in a low temperature state, and the radial seal of the upper sub-opening in the low temperature state is maintained;
the axial compression amount of the upper sub-opening is reduced in a low-temperature state, so that the pulling deformation amount of the upper sub-opening in the direction far away from the inner side of the connecting screw is increased when the air spring is loaded and displaced, the sealing pressure and the compression amount of an axial sealing surface, which is applied to the upper sub-opening in the direction far away from the inner side of the connecting screw, of the upper cover plate are increased, the axial sealing of the upper sub-opening in the low-temperature state is maintained, and the effective sealing of the upper sub-opening in the low-temperature state is realized.
The utility model provides a low temperature resistant air spring, includes the upper cover plate, hugs closely the buckle of upper cover plate bottom surface, connects connecting bolt and the gasbag of upper cover plate and buckle, and the last seam allowance compression of gasbag is between upper cover plate and buckle, and buckle and connecting bolt all set up in the radial outside of seam allowance, and the bag body of upper seam allowance below is laminated and is followed downwards along laminating to the buckle bottom surface with the buckle inner wall, its characterized in that the seal structure of upper seam allowance adopt claim to arbitrary low temperature resistant air spring on seam allowance seal structure.
The invention has the beneficial effects that:
according to the invention, the sealing structures which are alternately arranged in radial sealing and axial sealing and are sequentially connected are adopted between the upper cover plate and the upper sub-opening and between the upper sub-opening and the retaining ring, and the top surface and the bottom surface of the upper sub-opening of the air spring are sealed through the two-way sealing structures of radial sealing and axial sealing under the inflation state, so that the sealing effect is better.
When the air spring is loaded and displaced, the air bag deforms outwards and downwards, and as the retaining ring and the connecting bolt are arranged on the radial outer side of the upper sub-opening, the upper sub-opening is led to be pulled inwards and downwards, so that the upper sub-opening is pulled towards the inner side direction far away from the connecting bolt in the air bag deformation process, the sealing pressure of at least one axial sealing surface on the upper sub-opening is designed to be towards the inner side direction far away from the connecting bolt, when the upper sub-opening is pulled towards the inner side direction far away from the connecting bolt, the sealing pressure of the axial sealing surface which is applied to the sealing pressure on the upper sub-opening towards the inner side direction far away from the connecting bolt is increased, so that the compression amount of the axial sealing surface is synchronously increased, and the sealing pressure and the compression amount of the axial sealing surface are increased along with the loading and displacement of the air spring, thereby the sealing performance between the upper sub-opening and the upper cover plate is improved, and the sealing reliability of the upper sub-opening of the air spring in the loading process is ensured.
According to the requirement of sealing the upper sub-opening of the air spring in a low-temperature state and the cold shrinkage of the upper sub-opening in a low-temperature environment, the compression of the upper sub-opening between the upper cover plate and the retaining ring is designed, so that the cold shrinkage of the upper sub-opening of the air spring in the low-temperature state is smaller than the axial compression of the upper sub-opening, the radial sealing of the upper sub-opening in the low-temperature state is maintained, the rubber is easier to deform due to shrinkage and creep fatigue of the rubber in the low-temperature state, the pulling deformation of the upper sub-opening in the inner side direction far from the connecting screw is increased when the air spring is loaded and displaced, the sealing pressure and the compression of the upper sub-opening in the inner side direction far from the connecting screw are increased, the axial sealing of the upper sub-opening is maintained, the effective sealing of the upper sub-opening in the low-temperature state is realized, the influence of the sealing pressure reduction caused by the rubber shrinkage in the low-temperature state is counteracted, the sealing requirement of the air spring in the low-temperature state is met, and the sealing reliability and the use reliability of the air spring in the low-temperature state are improved.
Drawings
Fig. 1 is a schematic structural diagram of a sealing structure of a sub-port on a low temperature resistant air spring in a first embodiment.
Fig. 2 is a schematic structural view of the upper cover plate in fig. 1.
Fig. 3 is a schematic view of the structure of the upper sub-opening in fig. 1.
Fig. 4 is a schematic structural diagram of a sealing structure of a sub-port on a low temperature resistant air spring in a second embodiment.
Fig. 5 is a cross-sectional view of the clasp.
FIG. 6 is a schematic diagram of a low temperature resistant air spring according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below with reference to fig. 1 to 6.
Embodiment one:
the utility model provides a low temperature resistant air spring goes up seam allowance seal structure, includes upper cover plate 1, hugs closely buckle 2 of upper cover plate 1 bottom surface, connects upper cover plate 1 and the connecting bolt 3 of buckle 2 and the last seam allowance 4 of gasbag, goes up seam allowance 4 compression between upper cover plate 1 and buckle 2, and buckle 2 and connecting bolt 3 all set up in the radial outside of last seam allowance 4, and the bag body 100 of upper seam allowance 4 below is laminated and is down along laminating to buckle 2 bottom surface with buckle 2 inner wall, characterized by that between upper cover plate 1 and the last seam allowance 4 and go up between seam allowance 4 and the buckle 2 all adopt radial seal and axial seal to set up alternately and the seal structure who connects gradually, at least one axial seal on the upper seam allowance 4 is faced the sealing pressure of upper cover plate 1 towards keeping away from the inboard direction of connecting bolt 3, and its sealing pressure and compression volume increase along with air spring's load and displacement.
The sealing structure that the upper cover plate 1 and the upper sub opening 4 and the retaining ring 2 are alternately arranged by radial sealing and axial sealing and are sequentially connected is adopted in the low-temperature-resistant air spring upper sub opening sealing structure, and the top surface and the bottom surface of the upper sub opening 4 are sealed by the radial sealing and axial sealing bidirectional sealing structure under the inflation state of the air spring, so that the sealing effect is better.
When the air spring is loaded and displaced, the air bag 100 is deformed outwards and downwards, namely, in the direction E in fig. 1, so that the upper sub-opening is inwards and downwards pulled, namely, in the direction F in fig. 1, since the retaining ring and the connecting bolt are both arranged on the radial outer side of the upper sub-opening, the stress of the air bag 100 is as shown in fig. 1, and the direction F of the position of the upper sub-opening 4 is along the direction E, so that the upper sub-opening 4 is pulled towards the inner side direction far away from the connecting bolt 3 during the deformation process of the air bag, the sealing pressure of at least one axial sealing surface on the upper sub-opening 4 is designed to be towards the inner side direction far away from the connecting bolt, and when the upper sub-opening is pulled towards the inner side direction far away from the connecting bolt, the sealing pressure of the upper sub-opening 4 is increased, so that the compression amount of the axial sealing surface is synchronously increased along with the loading and displacement of the air spring, the sealing performance between the upper sub-opening 4 and the upper sub-opening 1 is improved, and the reliability of the loaded air spring is ensured.
According to the requirement of sealing the upper sub opening of the air spring in a low-temperature state and the cold shrinkage of the upper sub opening in a low-temperature environment, the compression of the upper sub opening between the upper cover plate and the retaining ring is designed, so that the cold shrinkage of the upper sub opening of the air spring in the low-temperature state is smaller than the axial compression of the upper sub opening, the radial sealing of the upper sub opening in the low-temperature state is maintained, the sealing requirement of the air spring in the low-temperature state is met due to rubber shrinkage and creep fatigue, the rubber is easier to deform, the pulling deformation of the upper sub opening in the inner side direction far from the connecting screw is increased when the air spring is loaded and displaced, the axial sealing surface applying sealing pressure to the inner side direction far from the connecting screw on the upper sub opening, namely the axial sealing surface applying sealing pressure to the F direction in FIG. 1 is increased, the axial sealing pressure and the compression of the upper cover plate are accordingly maintained, the effective sealing of the upper sub opening in the low-temperature state is realized, the influence of the sealing pressure reduction caused by the rubber shrinkage in the low-temperature state is counteracted, the sealing requirement of the air spring in the low-temperature state is met, and the sealing reliability and the use reliability of the air spring in the low-temperature state is improved.
Wherein, the ring 2 is provided with an annular ring groove 21 and a ring protrusion 22 positioned at the inner side of the ring groove 21, and the bottom of the upper sub-opening 4 is provided with a bottom protrusion 41 corresponding to the ring groove 21 and a bottom groove 42 corresponding to the ring protrusion 22;
the bottom bulge 41 is pressed into the snap ring groove 21, the side surface of the bottom bulge 41 is bonded and pressed with the side surface of the snap ring groove 21 to form axial seal between the upper sub-opening 4 and the snap ring 2, and the bottom surface of the bottom bulge 41 is bonded and pressed with the bottom surface of the snap ring convex groove 21 to form radial seal between the upper sub-opening 4 and the snap ring 2;
the snap ring protrusion 22 is pressed into the bottom groove 42, the side surface of the snap ring protrusion 22 is bonded and pressed with the side surface of the bottom groove 42 to form axial seal between the upper sub-opening 4 and the snap ring 2, and the top surface of the snap ring protrusion 22 is bonded and pressed with the top surface of the bottom groove 42 to form radial seal between the upper sub-opening 4 and the snap ring 2.
As shown in the figure, the snap ring 2 is provided with a snap ring groove 21 and a snap ring protrusion 22 positioned at the inner side of the snap ring groove 21, the concave-convex structure is sequentially arranged, the bottom surface of the upper sub-opening 4 is designed to be matched with the snap ring groove 21, the bottom surface of the upper sub-opening is provided with a protrusion 41 and a bottom groove 42 matched with the snap ring protrusion 22, a biconcave convex matched structure between the snap ring 2 and the upper sub-opening 4 is formed, a bidirectional sealing structure for radial sealing and axial sealing between the snap ring 2 and the upper sub-opening is realized, and the sealing effect is good.
Wherein, the bottom surface of the bottom bulge 41 is a radial plane, the top surface of the bottom groove 42 is an arc surface, and the radial width of the bottom bulge 41 is two to three times of the radial width of the bottom groove 42, which is more beneficial to realizing uniform compression of the upper seam allowance when the connecting bolt 3 is screwed, and avoiding deformation or loosening of the retaining ring 2 or the upper cover plate 1 due to uneven distribution of elastic compression force at the upper seam allowance.
The top surface of the upper sub-opening 4 is provided with a radial sealing surface 43 in radial sealing fit with the bottom surface of the upper cover plate 1 and an axial sealing surface 44 in axial sealing fit with the bottom surface of the upper cover plate 1, the bottom surface of the upper cover plate 1 is provided with a radial sealing fit surface 11 in sealing fit with the radial sealing surface 43 and an axial sealing fit surface 12 in sealing fit with the axial sealing surface 44, the radial sealing surfaces 43 and the axial sealing surfaces 44 are alternately arranged and sequentially connected, as can be seen in fig. 1, the number of the radial sealing surfaces 43 is two, the sealing pressure of the axial sealing surfaces 44 positioned on the inner side is in the inner side direction far away from the connecting bolt 3, the number of the axial sealing fit surfaces 12 is also two, a radial sealing fit surface 43 is connected between the two axial sealing fit surfaces 44 to form a top surface bulge 45, a radial sealing fit surface 11 is connected between the two axial sealing fit surfaces 12 to form an upper cover plate groove 13, a heating deformation gap III 7 extending to the outer side surface of the upper sub-opening 4 is arranged between the upper cover ring 1 and the retaining ring 2, and the axial compression amount of the top surface bulge 45 in the upper cover plate groove 13 is larger than 1mm.
When the air spring is loaded and displaced, the air bag 100 is deformed outwards and downwards, as shown in fig. 1, the inner axial sealing surface 44 is stressed by the pulling force in the F direction, namely, the sealing pressure of the axial sealing surface 44 on the axial sealing matching surface 12 is increased in the inner direction away from the connecting bolt 3, namely, in the F direction, so that the compression amount of the axial sealing surface 44 is synchronously increased, the sealing pressure and the compression amount of the axial sealing surface are increased along with the loading and displacement of the air spring, the sealing performance between the upper sub-opening 4 and the upper cover plate 1 is improved, and the sealing reliability of the upper sub-opening of the air spring in the loading process is ensured. According to the requirement of sealing the upper sub-opening of the air spring in a low-temperature state and the cold shrinkage of the upper sub-opening in a low-temperature environment, the compression of the upper sub-opening between the upper cover plate and the retaining ring is designed, so that the cold shrinkage of the top surface bulge 45 of the air spring in the low-temperature state is smaller than the axial compression, the compression of the top surface bulge 45 in the upper cover plate groove 13 is kept, radial sealing is kept, the rubber is easier to deform due to rubber shrinkage and creep fatigue in the low-temperature state, namely the upper sub-opening is easier to be pulled and deformed, the pulling deformation of the upper sub-opening in the inner side direction far away from the connecting screw is increased when the air spring is loaded and displaced, the sealing pressure and the compression of the axial sealing surface 12 close to the inner side are increased, the axial sealing is kept, the effective sealing of the upper sub-opening in the low-temperature state is realized, the influence of the sealing pressure reduction caused by the rubber shrinkage in the low-temperature state is counteracted, the sealing requirement of the air spring in the low-temperature state is met, and the sealing reliability and the use reliability of the air spring in the low-temperature state are improved. The heating deformation gap III 7 is used for the expansion deformation flow of the upper sub-mouth 4 rubber in a high-temperature state, so that the fatigue resistance of the upper sub-mouth rubber is improved, and the service life is prolonged.
Wherein, the inner diameter of the snap ring groove 21 is larger than the inner diameter of the upper cover plate groove 13, the outer diameter of the snap ring groove 21 is equal to or larger than the outer diameter of the upper cover plate groove 13, so that the position of the upper cover plate groove 13 is convenient to be determined, and the depth of the upper cover plate groove 13 is 2-5mm. The top surface protrusion 45 is ensured to have a sufficient compression amount in the upper cover plate groove 13 to ensure sealing performance of the upper sub-opening in a low temperature state.
Embodiment two:
the difference with Shi Shili is that the number of axial matching surfaces 44 in the upper sub-opening 4 is one, the axial matching surfaces 44 are arranged between the two radial matching surfaces 4, the height of the radial matching surface 43 arranged on the inner side of the axial matching surfaces 44 is lower than that of the radial matching surface 43 arranged on the outer side of the axial matching surfaces 44, the axial matching surfaces 44 are connected with the radial matching surfaces 43 arranged on the outer side of the axial matching surfaces 44 to form a top surface bulge 45, the axial sealing matching surfaces 12 are connected with the radial sealing matching surfaces 11 to form an upper cover plate groove 13 matched with the top surface bulge 45, a heating deformation gap I5 is arranged between the top surface bulge 45 and the upper cover plate groove 13, the heating deformation gap 5 is arranged between the outer side wall of the upper sub-opening 4 and the side wall of the upper cover plate groove 13, a heating deformation gap II 6 is arranged between the upper sub-opening 4 and the clasp ring 2, the heating deformation gap II 6 is arranged between the outer side wall of the upper sub-opening 4 and the outer side wall of the clasp groove 21, and the heating deformation gap I5 and the heating deformation gap II 6 are communicated with each other up and down and have the same width. The axial sealing surface in the inner side direction far away from the connecting bolt 3 is omitted, the sealing reliability of the upper sub-mouth can be improved through the axial sealing surface in the inner side direction far away from the connecting bolt 3, the influence of the reduction of the sealing pressure caused by the shrinkage of rubber at low temperature is counteracted, the sealing requirement of the air spring at low temperature is met, the structure is simpler, the heating deformation gap I5 and the heating deformation gap II 6 are communicated up and down and have equal width, the heating deformation gap I is directly arranged between the outer side wall of the upper sub-mouth and the retaining ring 2 and the upper cover plate 1, the expansion deformation flow of the upper sub-mouth rubber at high temperature is easier, the deformation recovery is simpler, the fatigue life of the upper sub-mouth rubber is prolonged, and the service life of the upper sub-mouth rubber is prolonged.
The invention also provides a sealing method for the low-temperature-resistant air spring upper sub-opening, which adopts the sealing structure for the low-temperature-resistant air spring upper sub-opening and is characterized in that:
the upper sub-opening 4 is sealed alternately in the radial direction and the axial direction through a sealing structure between the upper cover plate 1 and the upper sub-opening 4 and between the upper sub-opening 4 and the retaining ring 2;
when the air spring is loaded and displaced, the upper port 4 is pulled towards the inner side direction far away from the connecting bolt 3, the sealing pressure and the compression amount of the axial sealing surface, which is applied to the upper port 4 towards the inner side direction far away from the connecting bolt 3, of the upper cover plate 1 are increased, and therefore the sealing performance between the upper port 4 and the upper cover plate 1 is improved;
the compression amount of the upper sub-opening 4 between the upper cover plate 1 and the retaining ring 2 is designed, so that the cold-receiving shrinkage amount of the upper sub-opening 4 of the air spring is smaller than the axial compression amount of the upper sub-opening 4 in a low temperature state, and the radial seal of the upper sub-opening 4 in the low temperature state is maintained;
the axial compression amount of the upper sub-opening 4 is reduced in the low temperature state, so that the pulling deformation amount of the upper sub-opening 4 in the inner side direction far away from the connecting screw 3 is increased when the air spring is loaded and displaced, the sealing pressure and the compression amount of an axial sealing surface, which applies sealing pressure in the inner side direction far away from the connecting screw 3, of the upper sub-opening 4 are increased, the axial sealing of the upper sub-opening 4 in the low temperature state is maintained, and the effective sealing of the upper sub-opening 4 in the low temperature state is realized.
The invention also protects a low-temperature-resistant air spring which comprises an upper cover plate 1, a retaining ring 2, a connecting bolt 3 and an air bag, wherein the retaining ring 2 is tightly attached to the bottom surface of the upper cover plate 1, the connecting bolt 3 is used for connecting the upper cover plate 1 and the retaining ring 2, an upper sub-opening 4 of the air bag is compressed between the upper cover plate 1 and the retaining ring 2, the retaining ring 2 and the connecting bolt 3 are both arranged on the radial outer side of the upper sub-opening 4, and a bag body below the upper sub-opening 4 is attached to the inner wall of the retaining ring 2 and is attached to the bottom surface of the retaining ring 2 downwards along the edge.
The low-temperature-resistant air spring has the advantages that the top surface and the bottom surface of the upper sub-opening are sealed through the radial sealing and axial sealing two-way sealing structure under the inflation state, and the sealing effect is better. The sealing device has the advantages that the effective sealing of the upper sub-opening in the low-temperature state is realized, the influence of the reduction of sealing pressure caused by rubber shrinkage in the low-temperature state is counteracted, the sealing requirement of the air spring in the low-temperature state is met, and the sealing reliability and the use reliability of the air spring in the low-temperature state are improved.
The foregoing disclosure of embodiments of the present invention has been fully described with reference to the accompanying drawings, in which it is to be understood that the embodiments described are merely some of the embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (7)
1. The utility model provides a low temperature resistant air spring upper sub-mouth seal structure, including upper cover plate (1), clasp (2) of hugging closely upper cover plate (1) bottom surface, connecting bolt (3) and the upper sub-mouth (4) of gasbag of connecting upper cover plate (1) and clasp (2), upper sub-mouth (4) compress between upper cover plate (1) and clasp (2), clasp (2) and connecting bolt (3) all set up the radial outside at upper sub-mouth (4), the bag body of upper sub-mouth (4) below is laminated with clasp (2) inner wall and is followed down to laminating to clasp (2) bottom surface, characterized by upper cover plate (1) and upper sub-mouth (4) and clasp (2) between all adopt radial seal and axial seal to set up and the seal structure that connects gradually in proper order, at least one axial seal on upper sub-mouth (4) is faced the sealing pressure of upper cover plate (1) towards keeping away from the inboard direction of connecting bolt (3), and its sealing pressure and compressed volume increase along with air spring's loading and displacement;
the snap ring (2) is provided with an annular snap ring groove (21) and a snap ring protrusion (22) positioned at the inner side of the snap ring groove (21), and the bottom of the upper sub-opening (4) is provided with a bottom protrusion (41) corresponding to the snap ring groove (21) and a bottom groove (42) corresponding to the snap ring protrusion (22);
the bottom bulge (41) is pressed into the snap ring groove (21), the side surface of the bottom bulge (41) is attached and pressed with the side surface of the snap ring groove (21) to form axial sealing between the upper sub-opening (4) and the snap ring (2), and the bottom surface of the bottom bulge (41) is attached and pressed with the bottom surface of the snap ring groove (21) to form radial sealing between the upper sub-opening (4) and the snap ring (2);
the snap ring bulge (22) is pressed into the bottom groove (42), the side surface of the snap ring bulge (22) is bonded and pressed with the side surface of the bottom groove (42), so that axial sealing between the upper sub-opening (4) and the snap ring (2) is formed, and the top surface of the snap ring bulge (22) is bonded and pressed with the top surface of the bottom groove (42), so that radial sealing between the upper sub-opening (4) and the snap ring (2) is formed;
the bottom surface of the bottom bulge (41) is a radial plane, the top surface of the bottom groove (42) is an arc surface, and the radial width of the bottom bulge (41) is two to three times of the radial width of the bottom groove (42);
the top surface of the upper sub-opening (4) is provided with a radial sealing surface (43) in radial sealing fit with the bottom surface of the upper cover plate (1) and an axial sealing surface (44) in axial sealing fit with the bottom surface of the upper cover plate (1), the bottom surface of the upper cover plate (1) is provided with a radial sealing matching surface (11) in sealing fit with the radial sealing surface (43) and an axial sealing matching surface (12) in sealing fit with the axial sealing surface (44), the radial sealing surfaces (43) and the axial sealing surfaces (44) are alternately arranged and sequentially connected, the number of the axial sealing surfaces (44) is at least one, the number of the radial sealing surfaces (43) is at least two, and the sealing pressure of the at least one axial sealing surface (44) to the axial sealing matching surface (12) is far away from the inner side direction of the connecting bolt (3).
2. The sub-port sealing structure of the low temperature resistant air spring according to claim 1, wherein the number of the radial sealing surfaces (43) is two, one axial sealing surface (44) is arranged between the two radial sealing surfaces (43), the height of the radial sealing surface (43) arranged on the inner side of the axial sealing surface (44) is lower than the height of the radial sealing surface (43) arranged on the outer side of the axial sealing surface (44), the axial sealing surface (44) is connected with the radial sealing surface (43) arranged on the outer side of the axial sealing surface (44) to form a top surface bulge (45), the axial sealing matching surface (12) is connected with the radial sealing matching surface (11) to form an upper cover plate groove (13) matched with the top surface bulge (45), and the axial compression amount of the top surface bulge (45) in the upper cover plate groove (13) is larger than 1mm.
3. The sealing structure of the low-temperature-resistant air spring upper sub-opening according to claim 2, which is characterized in that a heating deformation gap I (5) is formed between the top surface bulge (45) and the upper cover plate groove (13), the heating deformation gap I (5) is positioned between the outer side wall of the upper sub-opening (4) and the side wall of the upper cover plate groove (13), a heating deformation gap II (6) is formed between the upper sub-opening (4) and the retaining ring (2), the heating deformation gap II (6) is positioned between the outer side wall of the upper sub-opening (4) and the outer side wall of the retaining ring groove (21), and the heating deformation gap I (5) and the heating deformation gap II (6) are communicated up and down and have the same width.
4. The sealing structure of the sub-opening on the low-temperature-resistant air spring according to claim 2, which is characterized in that the number of the axial sealing surfaces (44) and the axial sealing matching surfaces (12) is two, a radial sealing surface (43) is connected between the two axial sealing surfaces (44) to form a top surface bulge (45), a radial sealing matching surface (11) is connected between the two axial sealing matching surfaces (12) to form an upper cover plate groove (13), and a heating deformation gap III (7) extending to the outer side surface of the upper sub-opening (4) is arranged between the upper cover plate (1) and the retaining ring (2).
5. The sealing structure of the low temperature resistant air spring upper seam allowance according to claim 3, wherein the inner diameter of the snap ring groove (21) is larger than the inner diameter of the upper cover plate groove (13), the outer diameter of the snap ring groove (21) is equal to or larger than the outer diameter of the upper cover plate groove (13), and the depth of the upper cover plate groove (13) is 2-5mm.
6. The method for sealing the sub-mouth on the low-temperature-resistant air spring is characterized in that the sub-mouth sealing structure on the low-temperature-resistant air spring is adopted, and is characterized in that:
the upper sub-opening (4) is sealed alternately in the radial direction and the axial direction through a sealing structure between the upper cover plate (1) and the upper sub-opening (4) and between the upper sub-opening (4) and the retaining ring (2);
when the air spring is loaded and displaced, the upper port (4) is pulled towards the inner side direction far away from the connecting bolt (3), the sealing pressure and the compression amount of the axial sealing surface, which is applied to the upper port (4) towards the inner side direction far away from the connecting bolt (3), of the sealing pressure are increased, and therefore the sealing performance between the upper port (4) and the upper cover plate (1) is improved;
the compression amount of the upper sub-opening (4) between the upper cover plate (1) and the retaining ring (2) is designed, so that the cold-receiving shrinkage amount of the upper sub-opening (4) of the air spring is smaller than the axial compression amount of the upper sub-opening (4) in a low temperature state, and the radial sealing of the upper sub-opening (4) in the low temperature state is maintained;
the axial compression amount of the upper sub-opening (4) is reduced in a low-temperature state, so that the pulling deformation amount of the upper sub-opening (4) in the inner side direction far away from the connecting screw (3) is increased when the air spring is loaded and displaced, the sealing pressure and the compression amount of an axial sealing surface, which is applied to the upper sub-opening (4) in the inner side direction far away from the connecting screw (3), of the sealing pressure are increased along with the axial sealing surface, the axial sealing of the upper sub-opening (4) in the low-temperature state is maintained, and the effective sealing of the upper sub-opening (4) in the low-temperature state is realized.
7. The utility model provides a low temperature resistant air spring, includes upper cover plate (1), hugs closely buckle (2) of upper cover plate (1) bottom surface, connecting bolt (3) and the gasbag of connecting upper cover plate (1) and buckle (2), last child mouth (4) compression of gasbag is between upper cover plate (1) and buckle (2), buckle (2) and connecting bolt (3) all set up in the radial outside of child mouth (4), the utricule of upper child mouth (4) below is laminated and is followed downwards along laminating to buckle (2) bottom surface with buckle (2) inner wall, its characterized in that the seal structure of upper child mouth (4) adopt the high child mouth seal structure of low temperature resistant air spring of any one of claims 1 to 5.
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| CN201910353905.XA CN109944894B (en) | 2019-04-29 | 2019-04-29 | Sealing structure, method and product of sub-opening on low-temperature-resistant air spring |
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| CN201910353905.XA CN109944894B (en) | 2019-04-29 | 2019-04-29 | Sealing structure, method and product of sub-opening on low-temperature-resistant air spring |
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| CN111520473B (en) * | 2020-05-06 | 2022-03-01 | 航天特种材料及工艺技术研究所 | Composite material aircraft fuel tank port cover sealing structure and sealing method |
| CN112431886A (en) * | 2020-11-05 | 2021-03-02 | 安徽红桥金属制造有限公司 | Combinable multi-joint-bag type air spring |
| CN112594317B (en) * | 2020-11-05 | 2022-08-19 | 安徽红桥金属制造有限公司 | Air spring convenient for cover plate installation |
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