CN210344293U - Shaft end sealing device suitable for high-temperature environment - Google Patents
Shaft end sealing device suitable for high-temperature environment Download PDFInfo
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- CN210344293U CN210344293U CN201920917927.XU CN201920917927U CN210344293U CN 210344293 U CN210344293 U CN 210344293U CN 201920917927 U CN201920917927 U CN 201920917927U CN 210344293 U CN210344293 U CN 210344293U
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Abstract
The utility model provides an axle head sealing device suitable for high temperature environment, including the bellows liquid film seal of keeping away from the axle head and the spring air film seal that is close to the axle head, bellows liquid film seal has first rotating ring seat, first throw-out collar, first rotating ring, is located the bellows between first rotating ring seat and the first throw-out collar, first rotating ring sets up with the axle sleeve interval. The corrugated pipe is used as an elastic element to replace a traditional spring and an auxiliary sealing ring by arranging the corrugated pipe liquid film seal and the spring gas film seal which are arranged side by side, so that the defects of the spring are well overcome, the instability is avoided under the high-temperature condition, the rigidity of the corrugated pipe is not influenced by the high temperature, and the sealing performance is favorably ensured; the spring close to the shaft end is sealed by an air film and is not directly contacted with a high-temperature process medium, and the spring is used as an elastic element, so that the stability of air film sealing is better facilitated; the two are matched to ensure that the sealed medium cannot leak, and the sealing performance is improved.
Description
Technical Field
The utility model belongs to the technical field of the axle head is sealed, concretely relates to axle head sealing device suitable for high temperature environment.
Background
The air film seal belongs to non-contact seal in the field of mechanical seal, has good sealing effect, especially has higher and higher requirements on mechanical seal along with the rapid development of industries such as petroleum, chemical engineering, aerospace, natural gas transportation and the like, and can realize zero leakage and zero escape of a sealing process medium.
The spring stiffness of a common air film seal is affected and becomes extremely unstable under high temperature conditions, and the sealing surface of the inner side seal deforms due to the temperature gradient of the inner diameter and the outer diameter under high temperature conditions, so that the service life of the seal is directly affected.
Disclosure of Invention
The utility model discloses to the above-mentioned problem that exists among the prior art, provide a shaft end sealing device suitable for high temperature environment, adopt bellows liquid film seal and spring gas film seal to combine together, improve sealed high temperature resistant ability, increase sealing ability to and be favorable to sealed structure compacter.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model provides an axle head sealing device suitable for high temperature environment, is sealed including the bellows liquid film who keeps away from the axle head and the spring air film who is close to the axle head, bellows liquid film seal has first rotating ring seat, first throw-out collar, first rotating ring, is located the bellows between first rotating ring seat and the first throw-out collar, first rotating ring sets up with the axle sleeve interval.
Furthermore, the distance between the first rotating ring and the shaft sleeve is 0.5-1 times of the axial size of the first rotating ring.
Furthermore, the first push ring and the shaft sleeve are arranged at intervals.
Furthermore, the first push ring is provided with an annular fixing lug extending towards the corrugated pipe, and one end of the corrugated pipe is fixed on the fixing lug in a sealing manner.
Further, the fixing lug is provided with a connecting end surface arranged in the radial direction.
Furthermore, the fixing lug comprises an extension part extending along the first push ring in the direction close to the corrugated pipe and an inclined part extending outwards along the extension part, and the connecting end face is the end face of the inclined part.
Furthermore, the bellows liquid film seal further comprises a bellows transmission ring fixed on the shaft sleeve, and the first movable ring seat is fixed on the bellows transmission ring.
Further, the first push ring is provided with a radial portion arranged along the radial direction and an axial portion arranged along the axial direction, and the first movable ring is located in a notch defined by the radial portion and the axial portion.
Furthermore, the inner end of the corrugated pipe transmission ring is provided with an annular transmission bulge extending towards the first transmission seat, the first movable ring seat is provided with a transmission groove, and the transmission bulge extends into the transmission groove.
Furthermore, a transmission sealing gasket which is sleeved on the shaft sleeve and used for realizing sealing between the first transmission seat and the shaft sleeve is further arranged in the transmission groove.
Furthermore, the bellows liquid film seal also comprises a first static ring, and the radial size of the sealing end face of the first static ring is 2-3 times that of the sealing end face of the first movable ring.
Furthermore, the sealing end surface of the first stationary ring and/or the sealing end surface of the first movable ring is provided with a hydrodynamic groove.
Furthermore, a sealing bulge extending out of the notch is arranged on the first movable ring, and a liquid film seal is formed between the sealing bulge and the first stationary ring.
Further, the spring air film seal comprises a second static ring and a second movable ring, and the ratio of the radial size of the seal end face of the second static ring to the radial size of the seal end face of the second movable ring is 1-1.5.
Further, the shaft end sealing device also comprises a labyrinth seal positioned between the bellows liquid film seal and the spring gas film seal.
The utility model provides a shaft end sealing device suitable for high temperature environment, through setting up the bellows liquid film seal and the spring gas film seal that set up side by side, adopt the bellows as elastic element, replace traditional spring and auxiliary seal circle, the defect of spring has been solved well, can not unstability under the high temperature condition, can not influence the rigidity of bellows because of the high temperature, is favorable to guaranteeing sealing performance; the spring close to the shaft end is sealed by an air film and is not directly contacted with a high-temperature process medium, and the spring is used as an elastic element, so that the stability of air film sealing is better facilitated; the two are matched to ensure that the sealed medium cannot leak, and the sealing performance is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a shaft end sealing device suitable for a high-temperature environment according to the present invention;
FIG. 2 is an enlarged schematic view of the bellows liquid film seal of FIG. 1;
fig. 3 is a cross-sectional enlarged structural view of the first push ring and the first rotating ring 13 in fig. 2;
FIG. 4 is an enlarged schematic view of the spring-air film seal and labyrinth seal of FIG. 1;
fig. 5 is an enlarged sectional view of the second rotating ring of fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. In the description of the present invention, it should be noted that the direction toward the axis in the normal use state is "inside" and the direction away from the axis is "outside". The terminology is for the purpose of describing the invention only and is for the purpose of simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and is not to be considered limiting of the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1-5, an embodiment of the shaft end sealing device suitable for high temperature environment provided by the present invention, an embodiment of the shaft end sealing device suitable for high temperature environment includes a bellows liquid film seal 10 far away from the shaft end and a spring air film seal 20 close to the shaft end, the bellows liquid film seal 10 and the spring air film seal 20 are arranged in series in the axial direction, or arranged side by side. The bellows liquid film seal 10 is arranged on one side close to an industrial medium and adopts liquid film seal, the bellows 14 is a tubular structure sleeved on the shaft sleeve 100, and the bellows 14 is adopted as an elastic element to replace a traditional spring and an auxiliary sealing ring, so that the defects of the spring are well overcome, and the instability can not occur under the high-temperature condition; because the corrugated pipe 3 does not influence the rigidity of the corrugated pipe due to high temperature, the corrugated pipe liquid film seal 10 can be suitable for a high-temperature working environment, and the corrugated pipe liquid film seal 10 is adopted on the side close to a process medium, so that the sealing performance is favorably ensured; a spring air film seal 20 is adopted near the shaft end, the spring air film seal 20 is not directly contacted with a high-temperature process medium, and a spring is adopted as an elastic element, so that the stability of air film sealing is more facilitated; the bellows liquid film seal 10 and the spring gas film seal 20 are matched to ensure that the sealed medium cannot leak, and the sealing performance is improved.
The shaft end sealing device also comprises a labyrinth seal 30 positioned between the bellows liquid film seal 10 and the spring gas film seal 20, and sealing gas is introduced between the spring gas film seal 20 and the labyrinth seal 30.
Referring to fig. 1-3, illustrating the structure of the bellows liquid film seal 10, the bellows liquid film seal 10 has a first movable ring seat 11, a first push ring 12, a first movable ring 13, a bellows 14 located between the first movable ring seat 11 and the first push ring 12, and a first stationary ring 15, wherein the first movable ring 13 is spaced apart from the shaft sleeve 100. One end of the corrugated pipe 14 is fixed on the first push ring 12 in a sealing manner, and the other end of the corrugated pipe 14 is at the sealing height on the first movable ring seat 11, the corrugated pipe 14 can support the first push ring 12 and the first movable ring 13 to be sleeved on the shaft sleeve 100 in a suspending manner, namely the first movable ring 13 is arranged at an interval with the shaft sleeve 100, and a certain distance is reserved between the first movable ring 13 and the shaft sleeve 100; the contact between the first movable ring 13 and the shaft sleeve 100 is avoided, the precision of the axial adjustment and movement of the first movable ring 13 is increased, the control and adjustment of the thickness of the sealing film of the bellows liquid film seal 10 are facilitated, and the sealing precision is increased. The distance between the first rotating ring 11 and the shaft sleeve 100 can be set to be 0.5-1 times of the axial dimension of the first rotating ring 11.
Referring to fig. 2, the first push ring 12 is spaced from the shaft sleeve 100, and the distance from the first push ring 12 to the shaft sleeve 100 is less than or equal to the distance from the first rotating ring 11 to the shaft sleeve 100; the distance between the first push ring 12 and the shaft sleeve 100 is 0.5-1 times of the axial dimension of the first movable ring 13.
Referring to fig. 3, the first push ring 12 has a radial portion 121 disposed along the radial direction and an axial portion 122 disposed along the axial direction, and the first moving ring 13 is fixed in a notch surrounded by the radial portion 121 and the axial portion 122; the first movable ring 13 is provided with a sealing bulge 131 extending out of the notch, and a liquid film seal is formed between the sealing bulge 131 and the first stationary ring 15. By providing the sealing protrusion 131, the size of the sealing end surface 132 of the first rotating ring 13 in the radial direction is small, which is beneficial to reducing the contact area between the sealing end surface 132 of the first rotating ring 13 and the sealing end surface 151 of the first stationary ring 15, and is beneficial to forming a stable liquid film. The radial dimension of the seal end face 151 of the first stationary ring 15 is preferably 2 to 3 times the radial dimension of the seal end face 132 of the first rotating ring 13. Hydrodynamic grooves are formed in the sealing end face 132 of the first rotating ring 13 or the sealing end face 151 of the first stationary ring 15, so that liquid introduced through the hydrodynamic grooves pushes the sealing end faces when the shaft rotates; preferably, the hydrodynamic grooves are uniformly arranged, so that liquid is uniformly introduced, and the stress on the sealing end face is uniform.
Referring to fig. 3, the first push ring 12 is provided with an annular fixing lug 123 extending toward the corrugated tube 14, and one end of the corrugated tube 14 is fixed on the fixing lug 123 in a sealing manner. The fixing lug 123 is arranged, so that the fixing operation of the corrugated pipe 14 and the first push ring 12 is facilitated, and the working efficiency is improved. Specifically, the fixing lug 123 has a connecting end surface 1233 arranged radially, and one end of the corrugated tube 14 is fixed on the connecting end surface 1233 in a sealing manner; the fixing lug 123 includes an extending portion 1231 extending along the radial portion 121 of the first push ring 12 toward the bellows 14, and an inclined portion 1232 extending outward continuously along the extending portion 1231, and the connecting end surface 1233 is an end surface of the inclined portion 1232.
Referring to fig. 2, the bellows liquid film seal 10 further includes a bellows drive ring 16 fixed to the shaft sleeve 100, and the first movable ring seat 11 is fixed to the bellows drive ring 16. The inner end of the corrugated pipe transmission ring 16 is provided with an annular transmission bulge 161 extending towards the first transmission seat 11, the first movable ring seat 11 is provided with a transmission groove, the transmission bulge 161 extends into the transmission groove, and the transmission groove is internally provided with a transmission sealing gasket 17 which is sleeved on the shaft sleeve 100 and is used for sealing between the transmission groove and the shaft sleeve 100; the arrangement of the transmission protrusions 161 and the transmission grooves is beneficial to the fixation of the first movable ring seat 11 to the bellows transmission ring 16, and is also beneficial to the arrangement of the transmission sealing gasket 17, so as to ensure the sealing of two sides of the bellows liquid film seal 10.
The bellows liquid film seal 10 is provided with a bellows driving ring 16, a first movable ring seat 11, a bellows 14, a first push ring 12, a first movable ring 13 and a first stationary ring 15 in sequence in the direction close to the shaft end.
Referring to fig. 1, 4 and 5, the structure of the spring air film seal 20 is described, the spring air film seal 20 includes a second stationary ring 21, a second moving ring 22, a second push ring 23, a spring 24 and a spring seat 25 which are sequentially arranged in a direction away from the shaft end, and the ratio of the radial dimension of the sealing end surface 211 of the second stationary ring 21 to the radial dimension of the sealing end surface 221 of the second moving ring 22 is 1-1.5. Preferably, the seal end surface 211 of the second stationary ring 21 or the seal end surface 221 of the second rotating ring 22 is provided with hydrodynamic grooves.
The second rotating ring 22 is a radially arranged ring sheet structure, the spring seat 25 is highly fixed on the shaft sleeve 100, a blocking arm 251 extending towards the shaft end is arranged on the outer side of the spring seat 25, a second snap ring 26 used for limiting the movable maximum distance of the second rotating ring 22 is arranged on the blocking arm 251, a blocking protrusion 223 protruding outwards is arranged on the second rotating ring 22, and the distance from the outer side of the blocking protrusion 223 to the axis is greater than the distance from the inner side of the second snap ring 26 to the axis.
Referring to fig. 5, a seal groove 222 is formed in the second rotating ring 22, the second seal ring 27 is located in the seal groove 222, the second seal ring 27 is used for sealing between the second rotating ring 22 and the shaft sleeve, the second rotating ring 22 and the shaft sleeve 100 are in clearance fit, and when the second rotating ring 22 moves axially, the second seal ring 27 needs to be pushed to move axially.
In this embodiment, the working method of the shaft end sealing device is as follows: when the shaft rotates, the process medium in the sealing cavity is guided into the sealing end face between the first movable ring 13 and the first static ring 15 of the bellows liquid film seal 10 through the dynamic pressure groove to form a liquid film seal, and the non-contact operation between the first movable ring 13 and the first static ring 15 is realized; meanwhile, the introduced sealing gas is introduced into the sealing end face between the second stationary ring 21 and the second moving ring 22 of the spring gas film seal 20 to form a gas film seal, so that the non-contact operation between the second stationary ring 21 and the second moving ring 22 is realized. The process medium leaked from the sealing end face between the first movable ring 13 and the first static ring 15 of the bellows liquid film seal 10 is led out through a leakage leading port; the sealing gas pressure is higher than the pressure of the leaked process medium, and the labyrinth seal 30 is arranged, so that the process medium leaked from the bellows liquid film seal 10 can not pollute the spring gas film seal 20.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an axle head sealing device suitable for high temperature environment, its characterized in that, is sealed including the bellows liquid film who keeps away from the axle head and the spring air film who is close to the axle head, bellows liquid film is sealed to have first rotating ring seat, first throw-out collar, first rotating ring, is located the bellows between first rotating ring seat and the first throw-out collar, first rotating ring sets up with the axle sleeve interval.
2. The shaft end sealing device of claim 1, wherein the first push ring is provided with an annular fixing lug extending towards the corrugated pipe, and one end of the corrugated pipe is fixed on the fixing lug in a sealing manner.
3. The shaft end seal arrangement of claim 2, wherein the fixing lug has a radially disposed connecting end surface, the fixing lug includes an extension portion extending along the first push ring in a direction approaching the bellows, and an inclined portion extending continuously outward along the extension portion, and the connecting end surface is an end surface of the inclined portion.
4. The shaft end sealing device of claim 1, wherein the bellows liquid film seal further comprises a bellows drive ring fixed to the sleeve, the first movable ring seat being fixed to the bellows drive ring; the first push ring is provided with a radial part and an axial part, the radial part and the axial part are arranged along the radial direction, and the first movable ring is located in a notch defined by the radial part and the axial part.
5. The shaft end seal arrangement of claim 4, wherein the bellows liquid film seal further comprises a first stationary ring, the first movable ring is provided with a sealing protrusion extending out of the notch, and a liquid film seal is formed between the sealing protrusion and the first stationary ring.
6. The shaft end sealing device as claimed in claim 4, wherein an annular transmission protrusion extending towards the first transmission seat is arranged at the inner end of the bellows transmission ring, a transmission groove is arranged on the first movable ring seat, and the transmission protrusion extends into the transmission groove.
7. The shaft end sealing device of claim 6, wherein a transmission sealing gasket which is sleeved on the shaft sleeve and used for sealing between the first transmission seat and the shaft sleeve is further arranged in the transmission groove.
8. The shaft end sealing device according to any one of claims 1 to 7, wherein the bellows liquid film seal further comprises a first stationary ring, and the radial dimension of the sealing end surface of the first stationary ring is 2 to 3 times the radial dimension of the sealing end surface of the first rotating ring.
9. The shaft end sealing device according to any one of claims 1 to 7, wherein the spring air film seal comprises a second stationary ring and a second movable ring, and the ratio of the radial dimension of the sealing end surface of the second stationary ring to the radial dimension of the sealing end surface of the second movable ring is 1-1.5.
10. An axial end seal according to any one of claims 1 to 7, characterized in that the axial end seal further comprises a labyrinth seal between the bellows liquid film seal and the spring gas film seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917927.XU CN210344293U (en) | 2019-06-18 | 2019-06-18 | Shaft end sealing device suitable for high-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917927.XU CN210344293U (en) | 2019-06-18 | 2019-06-18 | Shaft end sealing device suitable for high-temperature environment |
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| Publication Number | Publication Date |
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| CN210344293U true CN210344293U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920917927.XU Active CN210344293U (en) | 2019-06-18 | 2019-06-18 | Shaft end sealing device suitable for high-temperature environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880989A (en) * | 2021-01-08 | 2021-06-01 | 西华大学 | Testing device for characteristic parameters of fluid pressure membrane |
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2019
- 2019-06-18 CN CN201920917927.XU patent/CN210344293U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880989A (en) * | 2021-01-08 | 2021-06-01 | 西华大学 | Testing device for characteristic parameters of fluid pressure membrane |
| CN112880989B (en) * | 2021-01-08 | 2023-08-08 | 西华大学 | Testing device for characteristic parameters of fluid pressure membrane |
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