Sealing device

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

Technical Field

[0001] The invention relates to a sealing device, in particular to a sealing device whose sealing components can be assembled and disassembled as a whole. Background Art

[0002] In the fields of nuclear power, petrochemicals, food, etc., some shaft seals need to be replaced periodically because of the need to overhaul or replace related parts. Traditional sealing rings do not have their own protection and complete disassembly structure. The installation and disassembly process is not only difficult, but also there is a risk of sealing failure due to damage to the sealing ring during installation and disassembly, and the risk of sealing ring fragments falling into the medium due to the inability to ensure complete disassembly during disassembly, thereby causing the risk of medium contamination. Therefore, it is necessary to design a sealing device that can install and disassemble the sealing assembly as a whole to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a sealing device in which the sealing assembly can be assembled and disassembled as a whole.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a sealing device with a sealing component 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, a shaft rod axially inserted in the stuffing box, and a sealing component for sealingly connecting the shaft rod and the stuffing box, wherein the sealing component is axially compressed between the sealing gland and the stuffing box, the sealing component comprises a supporting ring, a clamping ring, and an annular sealing member arranged between the supporting ring and the clamping ring, wherein the supporting ring is accommodated in the stuffing cavity, an annular protrusion is provided on one side shaft end of the clamping ring, the clamping ring is axially relatively floatingly connected to the supporting ring through the annular protrusion, and the other side shaft end of the clamping ring cooperates with the sealing gland,

[0005] 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.

[0006] Preferably, an annular groove matching with 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 so as to slide relatively axially, and the sealing assembly also includes a connecting piece connecting the clamping ring and the support ring to axially limit the two.

[0007] Furthermore, 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, the connecting member is a connecting pin cooperatively inserted into the pin hole, and the connecting pin is axially inserted into the waist-shaped groove.

[0008] Furthermore, 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.

[0009] Furthermore, 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.

[0010] Specifically, at least two groups of pin holes are provided, and all of the pin holes are evenly spaced along the circumferential direction on the support ring. Correspondingly, multiple groups of waist-shaped grooves and connecting pins are also provided.

[0011] Preferably, the inner sealing rings and the outer sealing rings each have a plurality of groups sequentially arranged along the axial direction, and all of the inner sealing rings and the outer sealing rings are accommodated in the packing cavity.

[0012] Furthermore, the clamping ring includes a clamping end portion cooperating with the sealing gland and a connecting end portion provided between the clamping end portion and the annular protrusion, and at least a portion of the connecting end portion is axially cooperatively penetrated in the packing cavity.

[0013] As a specific implementation manner, the outer end surface of the clamping end portion and the axial end surface of one side of the sealing gland are conically matched.

[0014] Preferably, the sealing gland is a compression nut which is sleeved on the shaft end of the stuffing box and is threadably connected to the stuffing box.

[0015] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the sealing device of the present invention forms an integral sealing assembly by installing the inner sealing ring and the outer sealing ring between the support ring and the clamping ring, so that it can be integrally installed between the stuffing box and the shaft rod to form a sealed connection between the two, or it can be integrally removed from the sealing device, thus ensuring the integrity of the sealing ring during installation and disassembly, thereby ensuring the reliability of the seal, and the disassembly medium will not be contaminated, and the installation and disassembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 is a cross-sectional view of a sealing assembly used in a sealing device according to Example 1 of the present invention;

[0017] Attached Figure 2 is a cross-sectional view of a sealing device according to embodiment 1 of the present invention;

[0018] Attached Figure 3 for Figure 2 A magnified schematic diagram of the middle A part;

[0019] Attached Figure 4 is a cross-sectional view of a sealing device according to embodiment 2 of the present invention;

[0020] Wherein: 100, stuffing box; 200, 200', sealing gland; 300, shaft; 400, sealing assembly;

[0021] 1. Clamping ring; 11. Annular protrusion; 12. Connecting end; 13. Clamping end; 14. Clamping end face; 15. Waist-shaped groove; 2. Support ring; 21. Annular groove; 22. Pin hole; 3. Inner sealing ring; 4. Outer sealing ring; 5. Connecting pin. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] See also Figure 2 A sealing device with a sealing assembly that can be assembled and disassembled as a whole is shown, and the sealing device includes a stuffing box 100 with a stuffing cavity, a sealing cover 200 fixed on the stuffing box 100, a shaft rod 300 axially inserted in the stuffing box 100, and a sealing assembly 400 for sealingly connecting the shaft rod 300 and the stuffing box 100. The sealing cover 200 and the stuffing box 100 are fixedly connected by a plurality of bolts, and the sealing assembly 400 is axially compressed between the sealing cover 200 and the stuffing box 100.

[0025] See also Figure 1 and Figure 3 As shown, the sealing assembly 400 includes a support ring 2, a clamping ring 1, and an annular seal provided between the support ring 2 and the clamping ring 1, wherein the support ring 2 is cooperatively accommodated in the packing cavity, an annular protrusion 11 is provided on one side of the axial end of the clamping ring 1, the clamping ring 1 is relatively floatingly connected with the support ring 2 in the axial direction through the annular protrusion 11, and the axial end of the clamping ring 1 where the annular protrusion 11 is not provided is axially matched with the sealing gland 200. The annular seal includes an inner sealing ring 3 and an outer sealing ring 4, the inner sealing ring 3 is cooperatively provided on the inner peripheral portion of the annular protrusion 11 and the inner peripheral portion thereof is mutually sealed with the outer peripheral portion of the shaft rod 300, and the outer sealing ring 4 is cooperatively provided on the outer peripheral portion of the annular protrusion 11 and the outer peripheral portion thereof is mutually sealed with the circumferential side wall of the packing cavity.

[0026] See also Figure 1As shown, in this embodiment, in the sealing assembly 400, an annular groove 21 matching with the annular protrusion 11 is provided on one side axial end of the support ring 2, and the annular protrusion 11 can be inserted in the annular groove 21 in a relatively slidable manner along the axial direction. The sealing assembly 400 also includes a connecting member 5 connecting the clamping ring 2 and the support ring 1 to axially limit the two. Here, a plurality of waist-shaped grooves 15 are provided on the annular protrusion 11 at intervals along the circumferential direction, and a plurality of pin holes 22 are correspondingly provided on the support ring 2. The connecting member 5 is a connecting pin 5 that is cooperatively penetrated in the pin hole 22, and the connecting pin 5 is axially penetrated in the waist-shaped groove 15.

[0027] In the specific setting, the length of the waist 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 when the clamping ring 2 moves toward the support ring 1, there is enough space for the inner sealing ring 3 and the outer sealing ring 4 to be freely compressed along the axial direction.

[0028] At least two groups of pin holes 22 are provided, and all the pin holes 22 are evenly spaced along the circumferential direction on the support ring 2. Correspondingly, multiple groups of waist-shaped grooves 15 and connecting pins 5 are also provided. Here, as a preferred embodiment, after the sealing assembly 400 is installed, the groove walls on both sides of the waist-shaped groove 15 along the annular protrusion 11 in the axial direction and the connecting pins 5 are provided with a gap to facilitate installation and to meet the requirements of the inner sealing ring 3 / outer sealing ring 4 being compressed along the axial direction to achieve sealing when the sealing assembly 400 is installed between the stuffing box 100 and the sealing gland 20.

[0029] See also Figure 2 , Figure 3 As shown, on the sealing assembly 400, both the inner sealing ring 3 and the outer sealing ring 4 have multiple groups arranged in sequence along the axial direction. When arranged, the total thickness of all the inner sealing rings 3 / outer sealing rings 4 should be less than the depth of the stuffing cavity, so that they can be completely accommodated in the stuffing cavity after being squeezed to achieve sealing.

[0030] The clamping ring 1 is T-shaped as a whole, and further comprises a clamping end 13 that cooperates with the sealing gland 200, and a connecting end 12 disposed between the clamping end 13 and the annular protrusion 11. The clamping end face 14 on the clamping end 13 is a conical face, which is used to axially cooperate with the conical end face of the sealing gland 200. At least part of the connecting end 12 can be axially cooperated to penetrate into the packing cavity, thereby realizing axial extrusion of the inner sealing ring 3 and the outer sealing ring 4 to form sufficient sealing stress at the sealing portion. The support ring 2 is completely accommodated in the packing cavity.

[0031] In this way, during installation, first assemble the various components on the sealing assembly 400, then axially insert the end of the sealing assembly 400 provided with the support ring 2 into the stuffing cavity and sleeve it on the shaft 300, then insert the sealing cover 200 and axially apply pressure to the sealing cover 200 to make it relatively tightly connected with the stuffing box 100. In this way, the inner sealing ring 3 and the outer sealing ring 4 are axially squeezed in the stuffing cavity to achieve the seal between the shaft 300 and the stuffing box 100. The installation is very convenient and will not cause damage to the sealing ring.

[0032] When disassembly is required, the connection between the sealing cover 200 and the stuffing box 100 is removed, and then the sealing assembly 400 is disassembled as a whole. The clamping ring 1 and the support ring 2 can be relatively separated by removing each connecting pin 5, and then each sealing ring can be taken out, which can ensure the integrity of each sealing ring and ensure that the medium is not contaminated.

[0033] In summary, the sealing device of the present invention, wherein the sealing assembly 400 can be installed as a whole into the device to be sealed or can be removed as a whole from the sealing device, which ensures the integrity of the sealing ring during installation and disassembly, thereby ensuring the reliability of the seal, and the disassembly medium will not be contaminated, and the installation and disassembly are very convenient.

[0034] Example 2

[0035] See also Figure 4 The main difference between the sealing device shown in the embodiment 1 and the embodiment 1 is the specific form of the sealing gland 200. In the embodiment, the sealing gland 200' is a compression nut sleeved on the axial end of the stuffing box 100, the compression nut is provided with an internal thread, and the compression nut is fixedly connected with the stuffing box 100 through threaded cooperation, so that the sealing assembly 400 is compressed between the sealing gland 200' and the stuffing box 100 in the axial direction.

[0036] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection 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, characterized in that: An annular groove matching with the annular protrusion is arranged on one side shaft end of the support ring, and the annular protrusion can be inserted into the annular groove in an axially relatively slidable manner. 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, characterized in that: The annular protrusion is provided with a plurality of waist-shaped grooves at intervals along the circumferential direction, and 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, 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, 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, characterized in that: At least two groups of pin holes are provided, and all the pin holes are evenly spaced and distributed on the support ring along the circumferential direction. Correspondingly, multiple groups of waist-shaped grooves and connecting pins are also provided.

7. The sealing device according to claim 1, characterized in that: The inner sealing rings and the outer sealing rings each have a plurality of groups 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, characterized in that: The clamping ring comprises a clamping end portion cooperating with the sealing gland and a connecting end portion arranged between the clamping end portion and the annular protrusion, and at least a part of the connecting end portion is axially cooperatively penetrated in the packing 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 matched with each other in a conical surface.

10. The sealing device according to claim 1, characterized in that: The sealing gland is a compression nut which is sleeved on the shaft end of the stuffing box and is threadably connected to the stuffing box.

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