CN111006021B

CN111006021B - Sealing device

Info

Publication number: CN111006021B
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: 2025-02-18
Anticipated expiration: 2039-12-02
Also published as: CN111006021A

Abstract

The present invention discloses a sealing device, comprising a stuffing box with a stuffing cavity, a sealing gland fixed on the stuffing box, a shaft rod axially inserted in the stuffing box, and a sealing assembly for sealingly connecting the shaft rod and the stuffing box, wherein an inner sealing ring and an outer sealing ring are installed between a support ring and a clamping ring to form an integral sealing assembly, so that the sealing assembly can be integrally installed between the stuffing box and the shaft rod to form a sealing connection between the two, or can be integrally removed from the sealing device, thereby ensuring the integrity of the sealing ring during installation and disassembly, thereby ensuring the reliability of the seal, and preventing the disassembly medium from being contaminated, and making installation and disassembly very convenient.

Description

Sealing device

Technical Field

The present disclosure relates to sealing devices, and particularly to a sealing device with a detachable sealing assembly.

Background

In the fields of nuclear power, petrifaction, food and the like, due to the fact that some shaft seals need to be overhauled or related elements need to be replaced, the seals need to be replaced periodically. 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 damage of the sealing ring in the assembly and disassembly process and the risk of medium pollution caused by broken pieces of the sealing ring falling into a medium caused by incapability of ensuring complete disassembly in the disassembly process are high. Therefore, it is required to design a sealing device capable of integrally mounting and dismounting the sealing assembly to solve the above-mentioned problems.

Disclosure of Invention

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

In order to achieve the aim, the technical scheme adopted by the invention is that the sealing device with the integrally-detachable sealing component comprises a stuffing box with a stuffing cavity, a sealing gland fixed on the stuffing box, a shaft rod axially inserted in the stuffing box, and a sealing component for sealing connection between the shaft rod and the stuffing box, wherein the sealing component is axially pressed between the sealing gland and the stuffing box, the sealing component comprises a supporting ring, a pressing ring and an annular sealing element arranged between the supporting ring and the pressing ring, wherein the supporting ring is accommodated in the stuffing box, one side shaft end part of the pressing ring is provided with an annular bulge, the pressing ring is axially and relatively floatingly connected with the supporting ring through the annular bulge, the other side shaft end part of the pressing ring is matched with the sealing gland,

The annular sealing piece comprises an inner sealing ring and an outer sealing ring, wherein the inner sealing ring is cooperatively arranged on the inner peripheral part of the annular bulge and is mutually in sealing fit with the outer peripheral part of the shaft rod, and the outer sealing ring is cooperatively arranged on the outer peripheral part of the annular bulge and is mutually in sealing fit with the circumferential side wall of the packing cavity.

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

Further, the annular bulge is provided with a plurality of waist-shaped grooves at intervals along the circumferential direction, the support ring is correspondingly provided with a plurality of pin holes, the connecting piece is a connecting pin which is penetrated in the pin holes in a matched manner, and the connecting pin is penetrated in the waist-shaped grooves along the axial direction.

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 amount of the annular sealing member in the axial direction.

Further, the waist-shaped groove is provided with gaps between the groove walls on two sides of the annular bulge in the axial direction and the connecting pin.

Specifically, the pin holes are at least provided with two groups, all the pin holes are uniformly distributed on the support ring at intervals along the circumferential direction, and correspondingly, the waist-shaped grooves and the connecting pins are also provided with a plurality of groups.

Preferably, the inner sealing ring and the outer sealing ring 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.

Further, the compression ring comprises a compression end part mutually matched with the sealing gland and a connection end part arranged between the compression end part and the annular bulge, and at least part of the connection end part is axially matched and penetrated in the packing cavity.

As a specific implementation mode, the outer end face of the pressing end part is in conical surface fit with one side shaft end face of the sealing gland.

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

Due to the application of the technical scheme, the sealing device has the advantages that compared with the prior art, the sealing device has the advantages that an integral sealing assembly is formed by installing the inner sealing ring and the outer sealing ring between the supporting ring and the compression ring, so that the sealing assembly can be integrally installed between the stuffing box and the shaft rod to form sealing connection between the stuffing box and the shaft rod, or the sealing device can be integrally detached from the sealing device, the integrity of the sealing ring during installation and detachment is ensured, the sealing reliability is ensured, a detaching medium is not polluted, and the assembly and the disassembly are very convenient.

Drawings

FIG. 1 is a cross-sectional view of a seal assembly employed in a seal apparatus of embodiment 1 of the present invention;

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

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

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

wherein, 100 parts of stuffing box, 200 parts of sealing gland, 300 parts of shaft lever, 400 parts of sealing component;

1. The device comprises a compression ring, an annular bulge, 12, a connecting end part, 13, a compression end part, 14, a compression end surface, 15, a waist-shaped groove, 2, a support ring, 21, an annular groove, 22, a pin hole, 3, an inner sealing ring, 4, an outer sealing ring and 5, a connecting pin.

Detailed Description

The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments.

Example 1

Referring to fig. 2, a sealing device with a detachable sealing assembly is shown, which comprises a stuffing box 100 with a stuffing cavity, a sealing gland 200 fixed 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 sealing gland 200 is fixedly connected with the stuffing box 100 through a plurality of bolts, and the sealing assembly 400 is axially compressed between the sealing gland 200 and the stuffing box 100.

Referring to fig. 1 and 3, the seal assembly 400 includes a support ring 2, a compression ring 1, and an annular seal member disposed between the support ring 2 and the compression ring 1, wherein the support ring 2 is cooperatively accommodated in a packing cavity, an annular protrusion 11 is disposed on an end portion of a side shaft of the compression ring 1, the compression ring 1 is axially and relatively floatingly connected with the support ring 2 through the annular protrusion 11, and an axial end portion of the compression ring 1, where the annular protrusion 11 is not disposed, is axially matched with the seal gland 200. The annular seal includes an inner seal ring 3 and an outer seal ring 4, the inner seal ring 3 being disposed in engagement with an inner peripheral portion of the annular projection 11 and in sealing engagement with an outer peripheral portion of the shaft 300, the outer seal ring 4 being disposed in engagement with an outer peripheral portion of the annular projection 11 and in sealing engagement with a circumferential side wall of the packing chamber.

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

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

At least two groups of pin holes 22 are provided, all the pin holes 22 are uniformly distributed on the support ring 2 at intervals along the circumferential direction, and correspondingly, the waist-shaped grooves 15 and the connecting pins 5 are also respectively provided with a plurality of groups. Here, it is preferable that the seal assembly 400 is provided with a gap between the connecting pin 5 and both side groove walls of the waist-shaped groove 15 along the axial direction of the annular protrusion 11 after the completion of the installation, so as to facilitate the installation and to satisfy the axial compression of the inner seal ring 3/outer seal ring 4 when the seal assembly 400 is fitted between the packing 100 and the seal gland 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 a plurality of groups sequentially arranged along the axial direction, and the total thickness of all the inner seal ring 3/the outer seal ring 4 is smaller than the depth of the packing cavity when the inner seal ring and the outer seal ring are arranged, so that the inner seal ring and the outer seal ring can be completely contained in the packing cavity after being extruded to realize sealing.

The compression ring 1 is in a T shape as a whole, the compression ring 1 further comprises a compression end 13 mutually matched with the sealing gland 200, and a connection end 12 arranged between the compression end 13 and the annular bulge 11, the compression end surface 14 on the compression end 13 adopts a conical surface for mutually axially matching with the conical end surface of the sealing gland 200, and at least part of the connection end 12 can axially matched penetrate into the packing cavity, so that 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.

In this way, during installation, the components on the seal assembly 400 are assembled firstly, then the end part of the seal assembly 400 provided with the support ring 2 is inserted into the packing cavity along the axial direction and sleeved on the shaft rod 300, and then the seal gland 200 is sleeved in and pressed on the seal gland 200 along the axial direction so as to be in relatively tight connection with the packing box 100, thus the inner seal ring 3 and the outer seal ring 4 are axially extruded in the packing cavity to realize the seal between the shaft rod 300 and the packing box 100, the installation is very convenient, and the damage of the seal ring cannot be caused.

When the gland 200 is required to be disassembled, the gland 200 is disassembled from the stuffing box 100, the sealing assembly 400 is disassembled integrally, the compression ring 1 and the support ring 2 can be separated relatively by disassembling the connecting pins 5, and then the sealing rings can be taken out, so that the integrity of the sealing rings can be ensured and the medium is not polluted.

In summary, the sealing device of the present invention, in which the sealing assembly 400 can be integrally mounted in the device to be sealed or can be integrally removed from the sealing device, ensures the integrity of the sealing ring during mounting and dismounting, thereby ensuring the reliability of the sealing, preventing the dismounting medium from being polluted, and being very convenient to mount and dismount.

Example 2

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

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims

1. A sealing device, comprising a stuffing box having a stuffing cavity, a sealing gland fixed on the stuffing box, a shaft rod axially inserted into the stuffing box, and a sealing assembly for sealingly connecting the shaft rod and the stuffing box, wherein the sealing assembly is axially compressed between the sealing gland and the stuffing box, and characterized in that:

The sealing assembly comprises a support ring, a clamping ring, and an annular seal arranged between the support ring and the clamping ring, wherein the support ring is accommodated in the packing cavity, an annular protrusion is provided on one side of the axial end of the clamping ring, the clamping ring is relatively floatingly connected to the support ring along the axial direction through the annular protrusion, and the other side of the axial end of the clamping ring cooperates with the sealing gland.

The annular seal includes an inner sealing ring and an outer sealing ring. The inner sealing ring is cooperatively arranged on the inner peripheral portion of the annular protrusion and its inner peripheral portion and the outer peripheral portion of the shaft rod are sealed with each other. The outer sealing ring is cooperatively arranged on the outer peripheral portion of the annular protrusion and its outer peripheral portion and the circumferential side wall of the filling cavity are sealed with each other.

2. The sealing device according to claim 1 is characterized in that: an annular groove matching the annular protrusion is provided on one side axial end of the support ring, and the annular protrusion can be inserted into the annular groove in an axially relative sliding manner, and the sealing assembly also includes a connecting piece connecting the clamping ring and the support ring to axially limit the two.

3. The sealing device according to claim 2 is characterized in that: the annular protrusion is provided with a plurality of waist-shaped grooves spaced apart along the circumferential direction, a plurality of pin holes are correspondingly provided on the support ring, the connecting member is a connecting pin which is cooperatively inserted into the pin hole, the connecting pin extends radially along the annular seal, and the connecting pin is inserted into the waist-shaped groove.

4. The sealing device according to claim 3 is characterized in that 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 seal.

5. The sealing device according to claim 3 is characterized in that: after the sealing assembly is installed, there is a gap between the groove walls on both sides of the waist-shaped groove along the axial direction of the annular protrusion and the connecting pin.

6. The sealing device according to claim 3 is characterized in that: the pin holes are provided in at least two groups, and all the pin holes are evenly spaced along the circumferential direction on the support ring, and correspondingly, the waist-shaped grooves and the connecting pins are also provided in multiple groups.

7. The sealing device according to claim 1 is characterized in that: the inner sealing rings and the outer sealing rings each have a plurality of groups arranged in sequence along the axial direction, and all of 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 is characterized in that: the clamping ring includes a clamping end that cooperates with the sealing cover, and a connecting end arranged between the clamping end and the annular protrusion, and at least a part of the connecting end is axially fitted and penetrates into the stuffing cavity.

9. The sealing device according to claim 8, characterized in that the outer end surface of the clamping end portion and the axial end surface of one side of the sealing gland are conically matched.

10. The sealing device according to claim 1, wherein the sealing gland is a compression nut sleeved on the axial end of the stuffing box and connected with the thread of the stuffing box.