CN211525543U - Sealing device - Google Patents

Abstract

The utility model discloses a sealing device, comprising a stuffing box with a stuffing cavity, a sealing gland fixed on the stuffing box, a shaft inserted in the stuffing box along the axial direction, and A seal assembly sealingly connected between the shaft rod and the stuffing box, wherein an integral seal assembly is formed by installing the inner seal ring and the outer seal ring between the support ring and the compression ring, so that they can be integrally installed to the Form a sealed connection between the stuffing box and the shaft, or remove it from the sealing device as a whole, so as to ensure the integrity of the sealing ring during installation and removal, thereby ensuring the reliability of the seal, and The disassembly medium will not be polluted, and the assembly and disassembly are very convenient.

Description

Sealing means

technical field

The utility model relates to a sealing device, in particular to a sealing device in which a sealing component can be assembled and disassembled as a whole.

Background technique

In nuclear power, petrochemical, food and other fields, some shaft seals need to be replaced periodically due to the need to overhaul or replace the relevant original parts. The traditional sealing ring does not have its own protection and ensure complete disassembly structure. The assembly and disassembly process is not only difficult, but also there is a risk of seal failure caused by damage to the seal ring during the installation and disassembly process. Ring fragments fall into the medium, creating a risk of medium contamination. Therefore, it is necessary to design a sealing device that can install and remove the sealing assembly as a whole to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a sealing device in which the sealing assembly can be assembled and disassembled as a whole.

In order to achieve the above purpose, the technical scheme adopted by the present invention is: a sealing device that can be assembled and disassembled as a whole, comprising a stuffing box with a stuffing cavity, a sealing gland fixed on the stuffing box, and a sealing device along the axial direction. A shaft rod inserted in the stuffing box, and a sealing assembly for sealing connection between the shaft rod and the stuffing box, the sealing assembly is axially compressed between the sealing gland and the Between the stuffing boxes, the sealing assembly includes a support ring, a compression ring, and an annular seal arranged between the support ring and the compression ring, wherein the support ring is accommodated in the packing cavity Among them, an annular protrusion is provided on one shaft end of the pressing ring, and the pressing ring is connected to the supporting ring relatively floating in the axial direction through the annular protrusion and the supporting ring. The shaft end of the other side of the tightening ring is matched with the sealing gland,

The annular seal includes an inner seal ring and an outer seal ring, the inner seal ring is fitted on the inner peripheral portion of the annular protrusion and the inner peripheral portion of the inner peripheral portion and the outer peripheral portion of the shaft are mutually For sealing fit, the outer sealing ring is fitted on the outer peripheral portion of the annular protrusion and is in sealing fit with the peripheral side wall of the packing cavity.

Preferably, a shaft end of one side of the support ring is provided with an annular groove matched with the annular protrusion, and the annular protrusion can be inserted into the annular groove relatively slidably along the axial direction In the groove, the sealing assembly further includes a connecting piece for connecting the pressing ring and the supporting ring to limit the axial position of the two.

Further, the annular protrusion 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, and the connecting piece is fitted through the pin holes. The connecting pin is inserted in the waist-shaped groove in 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 axial compression of the annular seal.

Further, there are gaps between the groove walls on both sides of the waist-shaped groove in the axial direction of the annular protrusion and the connecting pin.

Specifically, there are at least two groups of the pin holes, and all the pin holes are evenly distributed along the circumferential direction on the support ring. Correspondingly, the waist-shaped grooves and the connecting pins are also provided with multiple Group.

Preferably, the inner sealing ring and the outer sealing ring have multiple groups arranged in sequence along the axial direction, and all the inner sealing ring and the outer sealing ring are accommodated in the packing cavity.

Further, the pressing ring includes a pressing end that cooperates with the sealing gland, a connecting end arranged between the pressing end and the annular protrusion, and the connecting end is At least a part of it is axially fitted in the packing cavity.

As a specific implementation manner, the outer end surface of the pressing end portion and the axial end surface of one side of the sealing gland are fitted with a conical surface.

Preferably, the sealing gland is a compression nut that is sleeved on the shaft end of the stuffing box and is threadedly connected to the stuffing box.

Due to the application of the above-mentioned technical solutions, the present utility model has the following advantages compared with the prior art: the sealing device of the present utility model is formed by installing the inner sealing ring and the outer sealing ring between the support ring and the pressing ring. The integral sealing assembly can be integrally installed between the stuffing box and the shaft to form a sealing connection between the two, or it can be integrally removed from the sealing device, thus ensuring the sealing ring during installation and removal. The integrity of the seal is ensured, and the disassembly medium will not be polluted, and the assembly and disassembly are very convenient.

Description of drawings

1 is a cross-sectional view of the sealing assembly used in the sealing device of Embodiment 1 of the present utility model;

Accompanying drawing 2 is the sectional view of the sealing device of the utility model embodiment 1;

Accompanying drawing 3 is the enlarged schematic diagram of the position of A part in FIG. 2;

Accompanying drawing 4 is the sectional view of the sealing device of the utility model embodiment 2;

Among them: 100, stuffing box; 200, 200', sealing gland; 300, shaft; 400, sealing assembly;

1. Pressing ring; 11. Annular protrusion; 12. Connecting end; 13. Pressing end; 14. Pressing end face; 15. Waist groove; 2. Support ring; 21. Ring groove; 22 , pin hole; 3, inner sealing ring; 4, outer sealing ring; 5, connecting pin.

Detailed ways

The technical solutions of the present utility model will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

Example 1

Referring to FIG. 2, a sealing device that can be assembled and disassembled as a whole is shown. The sealing device includes a stuffing box 100 with a stuffing cavity, a sealing gland 200 fixed on the stuffing box 100, and a gland 200 inserted into the stuffing box in the axial direction. The shaft rod 300 in the box 100, and the sealing assembly 400 for sealing connection between the shaft rod 300 and the stuffing box 100, the sealing gland 200 and the stuffing box 100 are fixedly connected by a plurality of bolts. Axially compressed between the gland 200 and the stuffing box 100 .

Referring to FIGS. 1 and 3 , the sealing assembly 400 includes a support ring 2 , a compression ring 1 , and an annular seal arranged between the support ring 2 and the compression ring 1 , wherein the support ring 2 is cooperatively accommodated in the In the packing cavity, there is an annular protrusion 11 on one side of the shaft end of the compression ring 1, and the compression ring 1 is connected to the support ring 2 relatively floatingly in the axial direction through the annular protrusion 11. The compression ring 1, the shaft end without the annular protrusion 11 is axially matched with the sealing gland 200. The annular seal includes an inner seal ring 3 and an outer seal ring 4. The inner seal ring 3 is fitted on the inner peripheral portion of the annular protrusion 11, and the inner peripheral portion and the outer peripheral portion of the shaft rod 300 are in sealing cooperation with each other. The outer sealing ring 4 is fitted on the outer peripheral portion of the annular protrusion 11 , and the outer peripheral portion thereof and the peripheral side wall of the packing cavity are in sealing fit with each other.

Referring to FIG. 1 , in the present embodiment, in the sealing assembly 400 , an annular groove 21 is arranged on one shaft end of the support ring 2 to match with the annular protrusion 11 , and the annular protrusion 11 can move along the shaft. Inserted into the annular groove 21 slidably toward each other, the sealing assembly 400 further includes a connecting member 5 that connects the pressing ring 2 and the support ring 1 to limit the axial position of the two. Here, the annular protrusion 11 is provided with a plurality of waist-shaped grooves 15 at intervals along the circumferential direction, the support ring 2 is provided with a plurality of pin holes 22 correspondingly, and the connecting piece 5 is fitted through the pin holes 22 The connecting pin 5 is inserted in the waist-shaped groove 15 in the axial direction.

In specific setting, 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 axial compression of all annular seals, so that there is enough space for the compression ring 2 to move toward the support ring 1 and the inner seal is sufficient. The ring 3 and the outer sealing ring 4 are free to compress in the axial direction.

There are at least two groups of pin holes 22 , and all the pin holes 22 are evenly distributed along the circumferential direction on the support ring 2 . Correspondingly, there are also multiple groups of waist grooves 15 and connecting pins 5 . Here, preferably, after the sealing assembly 400 is installed, the groove walls on both sides of the waist-shaped groove 15 along the axial direction of the annular protrusion 11 and the connecting pin 5 are provided with a gap to facilitate installation and When the sealing assembly 400 is installed between the stuffing box 100 and the sealing gland 200 , the inner sealing ring 3 / the outer sealing ring 4 are compressed in the axial direction to achieve sealing.

Referring to FIG. 2 and FIG. 3 , on the sealing assembly 400, the inner sealing ring 3 and the outer sealing ring 4 have multiple groups arranged in sequence in the axial direction. The total thickness is less than the depth of the packing cavity, so that it can be completely accommodated in the packing cavity after being squeezed to achieve sealing.

The pressing ring 1 is T-shaped as a whole, and the pressing ring 1 further includes a pressing end 13 that cooperates with the sealing gland 200 , and a connecting end 12 arranged between the pressing end 13 and the annular protrusion 11 . , the pressing end surface 14 on the pressing end portion 13 adopts a tapered surface for axially cooperating with the tapered end surface of the sealing gland 200, and at least part of the connecting end portion 12 can be fitted through the axial direction. It is arranged in the packing cavity, so as to realize the axial extrusion of the inner sealing ring 3 and the outer sealing ring 4 so that sufficient sealing stress is formed at the sealing position. The support ring 2 is completely accommodated in the packing cavity.

In this way, during installation, the components on the seal assembly 400 are assembled first, then the end of the seal assembly 400 provided with the support ring 2 is inserted into the packing cavity in the axial direction and sleeved on the shaft rod 300, and then Sleeve the sealing gland 200 and press the sealing gland 200 in the axial direction to make it relatively tightly connected with the stuffing box 100, so that the inner sealing ring 3 and the outer sealing ring 4 are axially squeezed in the packing cavity The sealing between the shaft rod 300 and the stuffing box 100 is realized by pressing, and the installation is very convenient and will not cause damage to the sealing ring.

When it needs to be disassembled, the connection between the sealing gland 200 and the stuffing box 100 is removed, and then the sealing assembly 400 is disassembled as a whole. Each sealing ring can be taken out, which can ensure the integrity of each sealing ring and ensure that the medium is not contaminated.

To sum up, in the sealing device of the present invention, the sealing assembly 400 can be integrally installed in the device to be sealed or can be removed from the sealing device as a whole, which ensures the integrity of the sealing ring during installation and removal, thereby ensuring The reliability of the seal, and the disassembly medium will not be polluted, and the assembly and disassembly are very convenient.

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 compression nut sleeved on the shaft end of the stuffing box 100 . The compression nut is provided with an internal thread, and is fixedly connected with the stuffing box 100 by screw fit. , so that the sealing assembly 400 is axially compressed between the sealing gland 200 ′ and the stuffing box 100 .

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention with this. All equivalent changes or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A sealing device, comprising a stuffing box with a stuffing cavity, a sealing gland fixed on the stuffing box, a shaft inserted in the stuffing box in the axial direction, and a shaft for the shaft A sealing assembly sealed with the stuffing box, the sealing assembly is axially pressed between the sealing gland and the stuffing box, and is characterized in that: The sealing assembly includes a supporting ring, a pressing ring, and an annular seal arranged between the supporting ring and the pressing ring, wherein the supporting ring is accommodated in the packing cavity, and the pressing One shaft end of the ring is provided with an annular protrusion, the pressing ring is connected to the support ring in an axially floating manner through the annular protrusion, and the other side of the pressing ring The shaft end is matched with the sealing gland, The annular seal includes an inner seal ring and an outer seal ring, the inner seal ring is fitted on the inner peripheral portion of the annular protrusion and the inner peripheral portion of the inner peripheral portion and the outer peripheral portion of the shaft are mutually For sealing fit, the outer sealing ring is fitted on the outer peripheral portion of the annular protrusion and is in sealing fit with the peripheral side wall of the packing cavity. 2 . The sealing device according to claim 1 , wherein a shaft end of one side of the support ring is provided with an annular groove matched with the annular protrusion, and the annular protrusion can Inserted into the annular groove relatively slidably along the axial direction, the sealing assembly further includes a connecting piece connecting the pressing ring and the support ring to limit the axial position of the two. 3 . The sealing device according to claim 2 , wherein the annular protrusion is provided with a plurality of waist-shaped grooves at intervals along the circumferential direction, and the support ring is provided with a plurality of pin holes correspondingly, so that the The connecting piece is a connecting pin that fits through the pin hole, and the connecting pin is axially inserted into the waist-shaped groove. 4 . The sealing device according to 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 seal. 5 . 5 . The sealing device according to claim 3 , wherein there is a gap between the groove walls on both sides of the waist-shaped groove in the axial direction of the annular protrusion and the connecting pin. 6 . 6 . The sealing device according to claim 3 , wherein there are at least two groups of the pin holes, and all the pin holes are distributed evenly along the circumferential direction on the support ring. The waist-shaped grooves and the connecting pins are also provided with multiple groups. 7 . The sealing device according to claim 1 , wherein the inner sealing ring and the outer sealing ring have multiple groups arranged in sequence in the axial direction, and all the inner sealing rings are connected to the The outer sealing rings are all accommodated in the packing cavity. 8. The sealing device according to claim 1 or 7, characterized in that: the pressing ring comprises a pressing end which cooperates with the sealing gland, and is arranged on the pressing end and the ring. At least part of the connecting end is axially fitted in the packing cavity. 9 . The sealing device according to claim 8 , wherein the outer end surface of the pressing end portion and the axial end surface of one side of the sealing gland are fitted with a conical surface. 10 . 10 . The sealing device according to claim 1 , wherein the sealing gland is a compression nut sleeved on the shaft end of the stuffing box and threadedly connected with the stuffing box. 11 .

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