CN117780931A - Floating friction sealing device for powder sealing - Google Patents
Floating friction sealing device for powder sealing Download PDFInfo
- Publication number
- CN117780931A CN117780931A CN202311705959.0A CN202311705959A CN117780931A CN 117780931 A CN117780931 A CN 117780931A CN 202311705959 A CN202311705959 A CN 202311705959A CN 117780931 A CN117780931 A CN 117780931A
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- ring
- sealing
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- rings
- grooves
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- 238000007789 sealing Methods 0.000 title claims abstract description 72
- 239000000843 powder Substances 0.000 title claims abstract description 26
- 230000003068 static effect Effects 0.000 claims abstract description 40
- 230000000670 limiting effect Effects 0.000 claims abstract description 29
- 238000009826 distribution Methods 0.000 claims description 32
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 2
- 230000002045 lasting effect Effects 0.000 abstract description 2
- 238000012856 packing Methods 0.000 description 5
- 239000004519 grease Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Sealing Devices (AREA)
Abstract
The invention discloses a floating friction sealing device for powder sealing, which comprises a base and an end cover, wherein grooves are formed in one joint side of the base and the end cover, and the grooves are folded to form a containing cavity; the two sides of the accommodating cavity are provided with floating friction sealing pairs, each floating friction sealing pair comprises a static ring, a movable ring and a limiting ring, the static rings are assembled in a shaft sleeve manner, the assembling surfaces of the static rings and the shaft sleeve manner form axial sealing, one side end surface of each static ring is clung to the corresponding side wall of the accommodating cavity, the other side end surface of each static ring is clung to the movable ring to form end surface sealing, the limiting rings are assembled on the outer side of the static rings in a nested manner, a floating gap exists between the static rings, springs are arranged between the two movable rings, and a spring accommodating groove is formed in each movable ring; and the end cover is provided with an air inlet and a leakage port which are communicated with the accommodating cavity. By adopting the sealing device, the coaxiality requirement of sealing assembly is reduced, and the lasting reliability of sealing is ensured.
Description
Technical Field
The invention relates to the technical field of sealing, in particular to a floating friction sealing device for powder sealing.
Background
In the current powder industry, such as the production process of foods, medicines, chemical industry, plastics and the like, equipment such as mixing, stirring, conveying, grinding and the like is needed, the movable shaft sealing is key, the past packing sealing is mainly used, and the packing sealing has certain market due to convenience (easy installation and replacement) and low cost (low price), but the packing sealing has requirements on coaxiality and maintainability (needing manual untimely pre-tightening), but in the practical application, on one hand, the untimely pre-tightening increases the labor intensity and the labor cost; on the other hand, the coaxiality of the equipment is reduced due to damage, frequent disassembly and assembly and the like in the operation process, and finally the sealing is invalid. Furthermore, the coaxiality of shaft seals at two ends of the equipment is required to be strictly ensured during assembly and debugging, and requirements on assembly and machining precision are set; in addition, since the filler itself is a wear member, the worn filler has a problem of contaminating the material.
Disclosure of Invention
In view of the above, the present invention aims to provide a floating friction sealing device for powder sealing, so as to reduce the coaxiality requirement of the sealing assembly and ensure the durable reliability of the sealing.
The invention solves the problems by the following technical means:
the invention provides a floating friction sealing device for powder sealing, which comprises a base and an end cover which are fixedly assembled together through bolts, wherein the base and the end cover are assembled in a shaft sleeve manner, grooves are formed in one joint side of the base and the end cover, and the grooves are folded to form a containing cavity; the two sides of the accommodating cavity are provided with floating friction sealing pairs, each floating friction sealing pair comprises a static ring, a movable ring and a limiting ring, the static rings are assembled in a shaft sleeve manner, the assembling surfaces of the static rings and the shaft sleeve manner form axial sealing, one side end surface of each static ring is clung to the corresponding side wall of the accommodating cavity, the other side end surface of each static ring is clung to the movable ring to form end surface sealing, the limiting rings are assembled on the outer side of the static rings in a nested manner, a floating gap exists between the static rings, springs are arranged between the two movable rings, and a spring accommodating groove is formed in each movable ring; and the end cover is provided with an air inlet and a leakage port which are communicated with the accommodating cavity.
Further, grooves are formed in two opposite sides of the movable ring, the grooves are folded to form an elastic sleeve accommodating cavity, an elastic sleeve assembled by sleeving a shaft seal is sleeved in the elastic sleeve accommodating cavity, the elastic sleeve forms an opening, the elastic sleeve is tightly held and fixed through a hoop, and lug grooves for accommodating hoop lugs are formed in the radial direction of the grooves.
Further, a plurality of circles of concentric circular grooves are formed in the end face, close to the stationary ring, of the movable ring.
Further, annular gas distribution grooves are formed in the inner side face of the end cover, the gas distribution grooves are arranged in the middle of the accommodating cavity, and the gas inlet and the leakage port are communicated with the gas distribution grooves.
Further, a gas distribution ring is arranged between the two limiting rings, the gas distribution ring is arranged corresponding to the gas distribution groove, and a plurality of gas distribution holes are uniformly formed in the circumferential direction of the gas distribution ring.
Further, the base is fixedly connected with the end plate of the shaft end through bolts.
Further, rotation limiting is achieved between the base and the stationary ring on the corresponding side through the rotation limiting pin which is assembled in an axial penetrating mode, and rotation limiting is achieved between the end cover and the stationary ring on the corresponding side through the rotation limiting pin which is assembled in an axial penetrating mode.
Further, the base, the end cover, the stationary ring and the movable ring are all of split structures assembled by folding bolts.
Further, a first sealing ring is arranged on the joint surface of the base and the end plate.
Further, a second sealing ring is arranged on the joint surface of the base and the end cover.
The invention has the beneficial effects that:
1. the static ring can float along with the deformation of the shaft, so that the coaxiality requirement of seal assembly is reduced, and when the static ring floats, the elastic force of the spring and positive air pressure are creatively introduced, so that the end face seal is realized by the fact that the dynamic ring is always tightly attached to the static ring, and the lasting reliability of the seal is ensured.
2. Further, a plurality of groups of concentric circular grooves are creatively formed in the end face sealing surface of the movable ring, and can be used as oil storage grooves for storing grease and enhancing the lubricity of the end face sealing surface, so that friction and abrasion are reduced, the service life is prolonged, and meanwhile, the high-viscosity grease can also play a role in blocking powder leakage; and the other party is communicated with the accommodating cavity, at the moment, the annular groove plays a role in accommodating powder leaked to the end face sealing surface, and the powder can be accumulated in the annular groove due to the centrifugal force, so that the powder is prevented from dry grinding the end face sealing surface to damage the end face sealing surface, and the service life is prolonged.
3. Further, an elastic sleeve is creatively arranged between the two floating friction sealing pairs, the elastic sleeve is elastically deformed by the holding force of the anchor ear, and the elastic sleeve is tightly attached to the inner wall of the groove when being deformed, so that sealing is formed.
4. In addition, the movable ring, the stationary ring, the end cover and the base are of a split structure, so that the quick-wear parts can be replaced conveniently, and meanwhile, the sleeve structure is suitable for replacing the existing packing seal and has maintenance-free property; the internal sealing condition can be checked at any time by observing the leakage port, and the vulnerable parts (the movable ring and the static ring) can be replaced in time.
5. In addition, the multi-seal forms a labyrinth seal, improving sealing capability.
6. Moreover, the dynamic ring and the static ring are made of modified polytetrafluoroethylene materials, so that the self-lubricating performance of the dynamic ring and the static ring is high, the texture is compact and airtight, and the shaft end sealing is realized under certain pressure and dust environment.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is an isometric view of a preferred embodiment of the invention;
FIG. 2 is a cross-sectional view of a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a stationary ring;
FIG. 4 is a schematic view of the structure of the ring at an angle;
FIG. 5 is a schematic view of another angle of the moving ring;
fig. 6 is a schematic structural view of the anchor ear;
FIG. 7 is a schematic structural view of an elastic sleeve;
FIG. 8 is a schematic view of the structure of the distributing ring;
FIG. 9 is a schematic view of the sealing surface of a floating friction seal pair.
In the figure: the end cover 1, the air distribution groove 1-1, the static ring 2, the rotation stopping hole 2-1, the movable ring 3, the circular ring groove 3-1, the groove 3-2, the lug groove 3-3, the spring accommodating groove 3-4, the anchor ear 4-1, the elastic sleeve 5, the opening part 5-1, the limiting ring 6, the air distribution ring 7, the air distribution hole 7-1, the base 8, the bolt 9, the first sealing ring 10, the second sealing ring 11, the shaft 12, the end plate 13, the air inlet 14, the leakage port 15, the rotation stopping pin 16, the spring 17, the accommodating cavity 18, the end face seal 19 and the axial seal 20.
Detailed Description
The invention is further described in detail below by means of the figures and examples. The features and advantages of the present invention will become more apparent from the description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention.
As shown in fig. 1 to 9, the present embodiment discloses a floating friction sealing device for powder sealing, comprising a base 8 and an end cover 1 fixedly assembled together by bolts 9, the base being fixedly connected with an end plate 13 of a shaft end by bolts; the base and the end cover are sleeved and assembled with the shaft 12, grooves are formed in one attached side of the base and the end cover, and the grooves are folded to form a containing cavity 18; the two sides of the accommodating cavity are provided with floating friction sealing pairs, each floating friction sealing pair comprises a static ring 2, a movable ring 3 and a limiting ring 6, the static rings are assembled in a shaft-sleeve manner, the assembly surfaces of the static rings and the shaft-sleeve manner form an axial seal 20, one side end surface of each static ring is clung to the corresponding side wall of the accommodating cavity, the other side end surface is clung to the movable ring to form an end surface seal 19, the limiting rings are assembled on the outer side of the static rings in a nested manner, a floating gap exists between the static rings, a spring 17 is arranged between the two movable rings, and a spring accommodating groove 3-4 is formed in each movable ring; the end cap is provided with an air inlet 14 and a leakage port 15 which are communicated with the accommodating cavity.
The two opposite sides of the movable ring are respectively provided with a groove 3-2, the two grooves are folded to form an elastic sleeve accommodating cavity, an elastic sleeve 5 assembled with the shaft seal sleeve in a sleeved mode is embedded in the elastic sleeve accommodating cavity, the elastic sleeve forms an opening part 5-1, the elastic sleeve is fastened and fixed through a hoop 4, and a lug groove 3-3 for accommodating the hoop lug 4-1 is formed in the radial direction of the grooves.
The end face of the movable ring, which is clung to the static ring, is provided with a plurality of circles of concentric circular ring grooves 3-1.
The inner side surface of the end cover 1 is provided with an annular gas distribution groove 1-1, the gas distribution groove is arranged in the middle of the accommodating cavity, and the gas inlet and the leakage port are communicated with the gas distribution groove. An air distribution ring 7 is arranged between the two limiting rings, the air distribution ring is arranged corresponding to the air distribution groove, and a plurality of air distribution holes 7-1 are uniformly formed in the circumferential direction of the air distribution ring.
Rotation limiting is achieved between the base and the stationary ring on the corresponding side through the rotation limiting pin 16 which is assembled in an axial penetrating mode, and rotation limiting is achieved between the end cover and the stationary ring on the corresponding side through the rotation limiting pin which is assembled in an axial penetrating mode.
The base, the end cover, the stationary ring and the movable ring are all of split structures assembled by folding bolts. The quick-wear part replacement is convenient, and meanwhile, the sleeve structure is suitable for replacing the existing packing seal and has maintenance-free performance. It should be noted that, such a member may be a unitary structure or a split structure, and may be set as desired.
The first sealing ring 10 is installed on the joint surface of the base and the end plate. The second sealing ring 11 is installed on the joint surface of the base and the end cover. So as to improve the sealing performance of the corresponding assembly surface.
To make the technical solution of the present application clearer, the present application is further described below:
as shown in fig. 1 and 2, the end cover 1 is fixedly connected with the base 8 through a plurality of groups of bolts 9 which are uniformly distributed in the circumferential direction, and the base 8 is fixedly connected with the end plate 13 through a plurality of groups of bolts 9 which are uniformly distributed in the circumferential direction; the end cover 1 is of a split structure, and two semicircular structures are connected into a whole through bolts; the inner side surface of the end cover is provided with an annular gas distribution groove 1-1, the end cover 1 is provided with a gas inlet 14 and a leakage port 15, and the gas inlet and the leakage port are communicated with the gas distribution groove through a channel arranged in the end cover; four groups of stop pins 16 are circumferentially embedded in the end face of the end cover, and the static ring rotation limit of the corresponding side is realized through the stop pins; similarly, four groups of stop pins are circumferentially embedded in the end face of the base 8, and the stationary ring rotation limit of the corresponding side is realized through the stop pins.
As shown in fig. 3, the stationary ring 2 is of a split structure, two semicircular structures are integrally connected through bolts, the stationary ring is made of modified polytetrafluoroethylene, has high hardness and wear resistance, has certain self-lubricity, and the end face and the inner ring face of the stationary ring are ground to improve the smoothness; four groups of rotation stopping holes 2-1 are formed in one side end face of the stationary ring 2, the aperture of each rotation stopping hole is slightly larger than the diameter 16 of each rotation stopping pin, each rotation stopping pin 16 is matched with each rotation stopping hole 2-1, a rotation limiting effect on the stationary ring 2 is achieved, meanwhile, the stationary ring 2 is embedded in the limiting ring 6, under the combined action of the limiting ring 6 and the rotation stopping pins 16, the stationary ring 2 can only float along the radial direction, and the axial direction and the circumferential direction are limited.
As shown in fig. 4 and 5, the moving ring 3 has a split structure, two semicircular structures are connected into a whole through bolts, and the moving ring is made of modified polytetrafluoroethylene; preferably, a plurality of groups of concentric circular ring grooves 3-1 are formed in the end surface sealing surface of the movable ring 3, and can be used as oil storage grooves for storing grease on one hand, so that the lubricity of the end surface sealing surface is enhanced, friction and abrasion are reduced, the service life is prolonged, and meanwhile, the high-viscosity grease can also play a role in blocking powder leakage; on the other hand, the compressed gas is introduced into the accommodating cavity, and at the moment, the annular groove 3-1 plays a role in accommodating powder leaked to the end face sealing surface, and due to the centrifugal force, the powder can be accumulated in the annular groove, so that the powder is prevented from dry grinding the end face sealing surface to damage the end face sealing surface, and the service life is prolonged.
As shown in fig. 5, the moving ring 3 is provided with a groove 3-2 for accommodating the elastic sleeve 5, the depth of the groove is smaller than the width of half of the elastic sleeve 5, the radial upper and lower positions of the groove 3-2 are provided with lug grooves 3-3 for accommodating the hoop lugs 4-1, and the lug grooves are formed on the corresponding end surfaces of the moving ring; four spring accommodating grooves 3-4 for accommodating springs 17 are uniformly formed in the circumferential direction of the corresponding end face of the movable ring 3; as shown in fig. 6, the anchor ear 4 is of a split structure, anchor ear lugs are arranged at two ends, and bolt holes are formed in the anchor ear lugs; as shown in fig. 7, the elastic sleeve 5 is provided with an opening 5-1, the opening is in a matched concave-convex structure, the head and the tail of the elastic sleeve 5 are connected through the concave-convex opening to form a whole circle, the elastic sleeve 5 is sleeved on the shaft 12, and the hoop 4 clamps the elastic sleeve 5 in a butt-clamping manner through bolts penetrating through the hoop lugs. The elastic sleeve 5 is protected from damaging the surface of the shaft, the hoop 4 is always tightly held on the shaft 12 and can rotate along with the shaft 12, the two groups of movable rings 3 are installed back to back, springs 17 are installed in the corresponding spring accommodating grooves 3-4, the hoop lugs 4-1 are arranged in the lug grooves 3-3, the elastic sleeve 5 is embedded in the grooves 3-2, the elastic sleeve 5 is tightly attached to the grooves 3-2 due to compression deformation caused by locking of the hoop, the sealing effect is achieved, the movable rings 3 are driven to rotate by the main shaft through the hoop lugs 4-1, and the two groups of movable rings 3 are always abutted against the end faces of the stationary rings 2 due to the action of the springs 17, so that sealing is achieved.
When the static ring 2 floats up and down along with the shaft 12, the end face is always propped against by the dynamic ring 3, the inner annular surface of the static ring 2 is in direct contact with the shaft 12, and the clearance between the dynamic ring 3 and the shaft 12 is slightly larger, so that two sealing surfaces, namely end face sealing and axial sealing, are realized.
The air inlet 14 is filled with compressed air, so that positive pressure (larger than the pressure in the sealed cavity) is formed in the accommodating cavity, the elastic sleeve 5 is helped to tightly hold the shaft 12 and the movable ring 3 against the static ring 2, the leakage port 15 is closed during working, and the leakage port can be opened at intervals to observe whether sealing materials leak or not, so that the movable ring and the static ring can be replaced timely. The two groups of limiting rings 6 in the accommodating cavity are axially limited through the distributing ring 7, and as shown in fig. 8, the distributing ring 7 is provided with a plurality of distributing holes 7-1 in a circumferential direction. The air distribution hole 7-1 is positioned under the air distribution groove 1-1 of the end cover 1, and the air distribution ring 7 plays a role in uniformly ventilating, so that the air entering from the air inlet 14 is uniformly distributed in the accommodating cavity.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A floating friction sealing device for powder sealing; the method is characterized in that: the base and the end cover are fixedly assembled together through bolts, the base and the end cover are assembled in a shaft sleeve joint manner, grooves are formed in one attached side of the base and one attached side of the end cover, and the grooves are folded to form a containing cavity; the two sides of the accommodating cavity are provided with floating friction sealing pairs, each floating friction sealing pair comprises a static ring, a movable ring and a limiting ring, the static rings are assembled in a shaft sleeve manner, the assembling surfaces of the static rings and the shaft sleeve manner form axial sealing, one side end surface of each static ring is clung to the corresponding side wall of the accommodating cavity, the other side end surface of each static ring is clung to the movable ring to form end surface sealing, the limiting rings are assembled on the outer side of the static rings in a nested manner, a floating gap exists between the static rings, springs are arranged between the two movable rings, and a spring accommodating groove is formed in each movable ring; and the end cover is provided with an air inlet and a leakage port which are communicated with the accommodating cavity.
2. A floating friction seal for powder seals as defined in claim 1 wherein: the two opposite sides of the movable ring are provided with grooves, the grooves are folded to form an elastic sleeve accommodating cavity, an elastic sleeve assembled by sleeving a shaft seal is sleeved in the elastic sleeve accommodating cavity, the elastic sleeve forms an opening part and is tightly fixed by hoops, and lug grooves for accommodating hoop lugs are formed in the radial direction of the grooves.
3. A floating friction seal for powder sealing as defined in claim 2, wherein: the end face, which is tightly attached to the stationary ring, of the movable ring is provided with a plurality of circles of annular grooves which are concentrically arranged.
4. A floating friction seal for powder seals as claimed in claim 3 wherein: the inner side surface of the end cover is provided with an annular air distribution groove, the air distribution groove is arranged in the middle of the accommodating cavity, and the air inlet and the leakage port are communicated with the air distribution groove.
5. A floating friction seal for powder seals as defined in claim 4 wherein: an air distribution ring is arranged between the two limiting rings, the air distribution ring is arranged corresponding to the air distribution grooves, and a plurality of air distribution holes are uniformly formed in the circumferential direction of the air distribution ring.
6. A floating friction seal for powder seals as defined in claim 5 wherein: the base is fixedly connected with the end plate of the shaft end through bolts.
7. A floating friction seal for powder seals as defined in claim 6 wherein: rotation limiting is achieved between the base and the stationary ring on the corresponding side through the rotation limiting pin assembled in an axial penetrating mode, and rotation limiting is achieved between the end cover and the stationary ring on the corresponding side through the rotation limiting pin assembled in an axial penetrating mode.
8. A floating friction seal for powder seals as defined in claim 7 wherein: the base, the end cover, the stationary ring and the movable ring are all of split structures assembled by folding bolts.
9. A floating friction seal for powder seals as defined in claim 8 wherein: the first sealing ring is arranged on the joint surface of the base and the end plate.
10. A floating friction seal for powder seals as defined in claim 9 wherein: and a second sealing ring is arranged on the joint surface of the base and the end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311705959.0A CN117780931A (en) | 2023-12-13 | 2023-12-13 | Floating friction sealing device for powder sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311705959.0A CN117780931A (en) | 2023-12-13 | 2023-12-13 | Floating friction sealing device for powder sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117780931A true CN117780931A (en) | 2024-03-29 |
Family
ID=90384515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311705959.0A Pending CN117780931A (en) | 2023-12-13 | 2023-12-13 | Floating friction sealing device for powder sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117780931A (en) |
-
2023
- 2023-12-13 CN CN202311705959.0A patent/CN117780931A/en active Pending
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