CN111006021A

CN111006021A - Sealing device

Info

Publication number: CN111006021A
Application number: CN201911214411.XA
Authority: CN
Inventors: 许怀锦; 马志刚; 骆青松; 韩嘉兴; 唐宝强; 何灿云
Original assignee: Suzhou Bmc Sealing Technology Co ltd; 719th Research Institute of CSIC
Current assignee: Suzhou Bmc Sealing Technology Co ltd; 719th Research Institute of CSIC
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-04-14

Abstract

The invention discloses a sealing device, which comprises a stuffing box with a stuffing cavity, a sealing gland fixedly arranged on the stuffing box, a shaft rod inserted in the stuffing box along the axial direction, and a sealing assembly for sealing connection between the shaft rod and the stuffing box, wherein an inner sealing ring and an outer sealing ring are arranged between a supporting ring and a pressing ring to form an integral sealing assembly, so that the sealing assembly can be integrally arranged between the stuffing box and the shaft rod to form the sealing connection between the stuffing box and the shaft rod, or the sealing assembly is integrally disassembled from the sealing device, so that the integrity of the sealing ring is ensured during installation and disassembly, the sealing reliability is ensured, a disassembly medium is not polluted, and the assembly and disassembly are very convenient.

Description

Sealing device

Technical Field

The invention relates to a sealing device, in particular to a sealing device with a sealing assembly capable of being integrally assembled and disassembled.

Background

In the fields of nuclear power, petrochemical industry, food and the like, some shaft seals need to be periodically replaced due to the need of overhauling or replacing related elements. The traditional sealing ring has no self protection and ensures a complete disassembly structure, the assembly and disassembly process is not only difficult, the risk of sealing failure caused by the damage of the sealing ring exists in the assembly and disassembly process, and the sealing ring fragments fall into a medium due to the incapability of ensuring complete disassembly in the disassembly process, so that the risk of medium pollution is caused. Therefore, it is necessary to design a sealing device capable of integrally mounting and dismounting a sealing assembly to solve the above problems.

Disclosure of Invention

The invention aims to provide a sealing device with a sealing assembly capable of being integrally assembled and disassembled.

In order to achieve the purpose, the invention adopts the technical scheme that: a sealing device with an integrally detachable sealing assembly comprises a stuffing box with a stuffing cavity, a sealing gland fixedly arranged on the stuffing box, a shaft rod inserted in the stuffing box along the axial direction, and a sealing assembly used for sealing connection between the shaft rod and the stuffing box, wherein the sealing assembly is compressed between the sealing gland and the stuffing box along the axial direction, the sealing assembly comprises a support ring, a compression ring and an annular sealing element arranged between the support ring and the compression ring, wherein the support ring is accommodated in the stuffing cavity, an annular bulge is arranged on one side shaft end part of the compression ring, the compression ring is connected with the support ring in a relatively floating way along the axial direction through the annular bulge, and the other side shaft end part of the compression ring is matched with the sealing gland,

the annular sealing element comprises an inner sealing ring and an outer sealing ring, the inner sealing ring is arranged on the inner peripheral portion of the annular bulge in a matched mode, the inner peripheral portion of the inner sealing ring is in mutual sealing fit with the outer peripheral portion of the shaft rod, the outer sealing ring is arranged on the outer peripheral portion of the annular bulge in a matched mode, and the outer peripheral portion of the outer sealing ring is in mutual sealing fit with the circumferential side wall of the packing cavity.

Preferably, an annular groove matched with the annular protrusion is formed in the shaft end portion on one side of the support ring, the annular protrusion can be axially and relatively slidably inserted into the annular groove, and the sealing assembly further comprises a connecting piece which is used for connecting the compression ring and the support ring so as to axially limit the compression ring and the support ring.

Further, annular protrusion is provided with a plurality of waist type grooves along circumference interval ground, be provided with a plurality of pinholes on the support ring correspondingly, the connecting piece is for wearing to establish with the cooperation connecting pin in the pinhole, just the connecting pin is worn to establish along the axial in the waist type groove.

Further, the length of the waist-shaped groove is not less than the sum of the diameter of the connecting pin and the maximum compression of the annular sealing element along the axial direction.

Furthermore, gaps are reserved between the groove walls of the two sides of the waist-shaped groove in the axial direction of the annular protrusion and the connecting pin.

Specifically, the pinhole is equipped with two sets at least, and all the pinhole is in evenly distributed along circumference interval on the support ring, correspondingly, waist type groove, the connecting pin also is equipped with the multiunit.

Preferably, the inner sealing rings and the outer sealing rings are provided with a plurality of groups which are sequentially arranged along the axial direction, and all the inner sealing rings and the outer sealing rings are accommodated in the packing cavity.

Furthermore, the compression ring comprises a compression end part matched with the sealing end cover and a connecting end part arranged between the compression end part and the annular bulge, and at least part of the connecting end part is axially and fittingly arranged in the packing cavity in a penetrating manner.

In a specific embodiment, the outer end face of the compressing end part and one axial end face of the compressing end cover are in conical fit.

Preferably, the sealing gland is a compression nut which is sleeved on the shaft end part of the stuffing box and is in threaded fit connection with the stuffing box.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the sealing device of the invention forms an integral sealing assembly by installing the inner sealing ring and the outer sealing ring between the supporting ring and the pressing ring, thereby being capable of being integrally installed between the stuffing box and the shaft rod to form sealing connection between the stuffing box and the shaft rod, or being capable of being integrally detached from the sealing device, thus ensuring the integrity of the sealing ring during installation and detachment, ensuring the reliability of sealing, preventing the detaching medium from being polluted, and being very convenient to assemble and disassemble.

Drawings

Fig. 1 is a sectional view of a seal assembly employed in a seal device of embodiment 1 of the present invention;

FIG. 2 is a sectional view of a sealing device according to embodiment 1 of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a sectional view of a sealing device according to embodiment 2 of the present invention;

wherein: 100. a stuffing box; 200. 200' and a sealing gland; 300. a shaft lever; 400. a seal assembly;

1. a compression ring; 11. an annular projection; 12. a connecting end portion; 13. compressing the end part; 14. pressing the end face; 15. a waist-shaped groove; 2. a support ring; 21. an annular groove; 22. a pin hole; 3. an inner seal ring; 4. an outer seal ring; 5. and (7) connecting pins.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

Example 1

Referring to fig. 2, the sealing assembly includes a stuffing box 100 having a stuffing chamber, a gland 200 fixedly installed on the stuffing box 100, a shaft 300 axially inserted in the stuffing box 100, and a sealing assembly 400 for sealing connection between the shaft 300 and the stuffing box 100, wherein the gland 200 and the stuffing box 100 are fixedly connected by a plurality of bolts, and the sealing assembly 400 is axially compressed between the gland 200 and the stuffing box 100.

Referring to fig. 1 and 3, the seal assembly 400 includes a support ring 2, a clamp ring 1, and an annular seal disposed between the support ring 2 and the clamp ring 1, wherein the support ring 2 is fittingly received in the packing cavity, one axial end of the clamp ring 1 has an annular protrusion 11, the clamp ring 1 is axially and relatively floatingly connected to the support ring 2 through the annular protrusion 11, and an axial end of the clamp ring 1, which is not provided with the annular protrusion 11, is axially fitted to the seal gland 200. The annular sealing element comprises an inner sealing ring 3 and an outer sealing ring 4, the inner sealing ring 3 is fittingly arranged on the inner periphery of the annular bulge 11, the inner periphery of the inner sealing ring is mutually matched with the outer periphery of the shaft rod 300 in a sealing mode, and the outer sealing ring 4 is fittingly arranged on the outer periphery of the annular bulge 11, the outer periphery of the outer sealing ring is mutually matched with the circumferential side wall of the packing cavity in a sealing mode.

Referring to fig. 1, in the present embodiment, in the seal assembly 400, an annular groove 21 matching with the annular protrusion 11 is provided on an axial end portion of one side of the support ring 2, the annular protrusion 11 is axially and relatively slidably inserted in the annular groove 21, and the seal assembly 400 further includes a connecting member 5 connecting the clamp ring 2 and the support ring 1 to axially limit the two. Here, a plurality of waist grooves 15 are provided at intervals in the circumferential direction on the annular protrusion 11, a plurality of pin holes 22 are correspondingly provided on the support ring 2, the connecting member 5 is a connecting pin 5 fittingly inserted into the pin holes 22, and the connecting pin 5 is axially inserted into the waist groove 15.

In a specific arrangement, the length of the kidney-shaped groove 15 is not less than the sum of the diameter of the connecting pin 5 and the maximum axial compression of all the annular sealing elements, so that the pressing ring 2 has enough space to freely compress the inner sealing ring 3 and the outer sealing ring 4 in the axial direction when moving towards the support ring 1.

At least two groups of pin holes 22 are arranged, all the pin holes 22 are uniformly distributed on the support ring 2 along the circumferential direction at intervals, and correspondingly, the kidney-shaped groove 15 and the connecting pin 5 are also respectively provided with a plurality of groups. Here, preferably, after the sealing assembly 400 is installed, the two side groove walls of the kidney-shaped groove 15 in the axial direction of the annular protrusion 11 and the connecting pin 5 are arranged with a gap therebetween, so as to facilitate installation and meet the requirement that the inner sealing ring 3/the outer sealing ring 4 is compressed in the axial direction to achieve sealing when the sealing assembly 400 is installed between the stuffing box 100 and the compression end cover 20.

Referring to fig. 2 and 3, in the seal assembly 400, the inner seal ring 3 and the outer seal ring 4 are provided with multiple sets which are sequentially arranged along the axial direction, and the arrangement should be such that the total thickness of all the inner seal ring 3/the outer seal ring 4 is smaller than the depth of the packing cavity, so that the packing cavity can be completely accommodated after being squeezed to realize sealing.

The whole pressing ring 1 is of a T shape, the pressing ring 1 further comprises a pressing end part 13 matched with the sealing end cover 200, and a connecting end part 12 arranged between the pressing end part 13 and the annular bulge 11, wherein a pressing end face 14 on the pressing end part 13 adopts a conical surface so as to be axially matched with the conical end face of the pressing end cover 200, at least part of the connecting end part 12 can penetrate through a packing cavity along the axial direction in a matched mode, and therefore the inner sealing ring 3 and the outer sealing ring 4 are axially extruded to form enough sealing stress at a sealing position. The support ring 2 is fully received in the packing cavity.

Therefore, during installation, all the components on the sealing assembly 400 are assembled firstly, then the end part of the sealing assembly 400, which is provided with the support ring 2, is inserted into the stuffing cavity along the axial direction and sleeved on the shaft rod 300, and then the pressing end cover 200 is sleeved in and pressed on the pressing end cover 200 along the axial direction to enable the pressing end cover to be fastened and connected with the stuffing box 100 relatively, so that the inner sealing ring 3 and the outer sealing ring 4 are axially extruded in the stuffing cavity to realize sealing between the shaft rod 300 and the stuffing box 100, the installation is very convenient, and the damage of the sealing rings can not be caused.

When the sealing assembly needs to be disassembled, the connection between the pressing end cover 200 and the stuffing box 100 is disassembled, then the sealing assembly 400 is integrally disassembled, the pressing ring 1 and the supporting ring 2 can be relatively separated by disassembling each connecting pin 5, and then each sealing ring can be taken out, so that the integrity of each sealing ring can be ensured, and the medium is prevented from being polluted.

In summary, the sealing device of the present invention, in which the sealing assembly 400 can be integrally installed in the device to be sealed or removed from the sealing device, ensures the integrity of the sealing ring during installation and removal, thereby ensuring the reliability of the seal, and the removal medium is not polluted, and is convenient to install and remove.

Example 2

Referring to the sealing device shown in fig. 4, the main difference from embodiment 1 is the specific form of the gland 200. In this embodiment, the gland 200 'is a compression nut sleeved on the shaft end of the stuffing box 100, and the compression nut is provided with an internal thread, and is fixedly connected with the stuffing box 100 through thread fit, so that the seal assembly 400 is compressed between the gland 200' and the stuffing box 100 along the axial direction.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing device comprising a stuffing box having a stuffing chamber, a gland fixedly arranged on the stuffing box, a shaft rod axially inserted in the stuffing box, and a seal assembly for sealing connection between the shaft rod and the stuffing box, the seal assembly being axially compressed between the gland and the stuffing box, characterized in that:

the sealing assembly comprises a support ring, a pressing ring and an annular sealing piece arranged between the support ring and the pressing ring, wherein the support ring is accommodated in the packing cavity, an annular bulge is arranged on the shaft end part on one side of the pressing ring, the pressing ring is connected with the support ring in a relatively floating mode along the axial direction through the annular bulge, the shaft end part on the other side of the pressing ring is matched with the sealing gland,

2. The sealing device of claim 1, wherein: the sealing assembly comprises a supporting ring and a pressing ring, wherein the supporting ring is provided with an annular bulge, the annular bulge is arranged on the end part of a shaft at one side of the supporting ring, the annular bulge is matched with the annular groove, the annular bulge can be axially and relatively slidably inserted into the annular groove, and the sealing assembly further comprises a connecting piece which is used for connecting the pressing ring and the supporting ring so as to axially limit the pressing ring and the supporting ring.

3. The sealing device of claim 2, wherein: annular protrusion is provided with a plurality of waist type grooves along circumference interval ground, be provided with a plurality of pinholes on the support ring correspondingly, the connecting piece is for wearing to establish coordinately the connecting pin in the pinhole, just the connecting pin is worn to establish along the axial waist type groove in.

4. The sealing device of claim 3, wherein: the length of the waist-shaped groove is not less than the sum of the diameter of the connecting pin and the maximum axial compression of the annular sealing element.

5. The sealing device of claim 3, wherein: gaps are arranged between the groove walls of the two sides of the waist-shaped groove in the axial direction of the annular bulge and the connecting pin.

6. The sealing device of claim 3, wherein: the pinhole is equipped with two sets ofly at least, and all the pinhole is in evenly distribute along circumference interval on the support ring, correspondingly, waist type groove the connecting pin also is equipped with the multiunit.

7. The sealing device of claim 1, wherein: the inner sealing rings and the outer sealing rings are provided with a plurality of groups which are sequentially arranged along the axial direction, and all the inner sealing rings and the outer sealing rings are accommodated in the packing cavity.

8. The sealing device according to claim 1 or 7, wherein: the compression ring comprises a compression end part matched with the sealing end cover and a connecting end part arranged between the compression end part and the annular bulge, and at least part of the connecting end part is axially and fittingly arranged in the packing cavity in a penetrating manner.

9. The sealing device of claim 8, wherein: the outer end face of the pressing end part is in conical surface fit with the shaft end face of one side of the pressing end cover.

10. The sealing device of claim 1, wherein: the sealing gland is a gland nut which is sleeved on the shaft end part of the stuffing box and is in threaded fit connection with the stuffing box.