CN112728989A - Self-tightening seal assembly - Google Patents

Abstract

The invention discloses a self-tightening sealing assembly which comprises an inner supporting ring, an outer supporting ring and a sealing ring arranged between the inner supporting ring and the outer supporting ring, wherein a medium introducing hole is formed in the inner supporting ring and penetrates through the inner side wall and the outer side wall of the inner supporting ring, the sealing ring is provided with a hollow inner cavity, a circular spring is arranged in the hollow inner cavity, an open slot communicated with the hollow inner cavity is formed in the peripheral part of the inner side of the sealing ring, and the medium introducing hole is communicated with the open slot. According to the self-tightening sealing assembly, high-temperature and high-pressure media enter the hollow inner cavity through the medium introducing hole, so that the temperature at each circumferential position is equal, the stress is uniform, multiple sealing stress can be provided, sufficient displacement compensation is formed axially at each circumferential node, self-tightening sealing is realized, and the problem of leakage of the sealing of a shell-and-tube multi-pass heat exchanger is solved.

Description

Self-tightening seal assembly

Technical Field

The present invention relates to a self-tightening seal assembly.

Background

In the industrial fields of nuclear power, petrochemical industry and the like, the phenomenon that the thermal expansion degree of the circumference of the sealing part of the flange is different due to asynchronous temperature exists, so that the sealing connection elements such as bolts and flanges are deformed incoordinatively, and the sealing stress of the sealing gasket is not uniform, so that the sealing gasket leaks. For example, the flange of the tube box of the shell-and-tube multi-pass heat exchanger has the defects that the temperatures of flange parts corresponding to the multiple tube passes from an inlet to an outlet are inconsistent due to objective temperature differences among the multiple tube passes, so that the internal thermal stress of the flange is formed, the axial deformation of each node in the circumferential direction of the flange is inconsistent, and the local loss of the axial sealing working stress of different nodes in the circumferential direction of the sealing gasket is caused, so that the sealing leakage is caused, and particularly, the leakage is easier when the number of the tube passes.

Disclosure of Invention

The invention aims to provide a self-tightening sealing assembly capable of improving the sealing performance of a sealing device.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a from compact form seal assembly, from compact form seal assembly includes inner support ring, outer support ring, and sets up inner support ring with sealing ring between the outer support ring, wherein, the hole is introduced to the medium has been seted up on the inner support ring, the hole is introduced to the medium run through inner support ring's inside wall with the lateral wall, the sealing ring has the cavity inner chamber, it has the annular spring that is to be the circle to embed in the cavity inner chamber, the inboard week of sealing ring has the intercommunication the open slot of cavity inner chamber, the hole is introduced to the medium with the open slot communicates each other.

Preferably, the notch of the open groove extends through in the circumferential direction of the seal ring.

Preferably, the cross section of the sealing ring is of a C-shaped structure.

Preferably, the outer peripheral portion of the spring abuts against the inner chamber wall of the hollow interior.

Preferably, the outer peripheral portion of the seal ring is a clearance fit with the inner peripheral portion of the outer support ring.

Preferably, sealing layers are fixedly arranged on two end faces of the inner support ring in the height direction.

Further preferably, the sealing layer is a flexible graphite layer or a flexible metal layer.

Further preferably, the medium introduction hole extends in a radial direction of the inner support ring.

Further preferably, the inner support ring comprises a ring body with an inner hole, and at least one rib fixedly arranged on the ring body, all the ribs divide the inner hole of the ring body into a plurality of cavities which are not communicated with each other, the medium introducing holes are provided with one or more, and all the medium introducing holes are communicated with only one of the cavities.

Further preferably, the height of the rib is consistent with that of the ring body, and two end faces in the height direction are respectively flush.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the self-tightening sealing assembly, high-temperature and high-pressure media can enter the inner cavity of the sealing ring through the medium introducing hole, multiple sealing stresses can be formed through the elasticity of the sealing ring, the elasticity of the spring and the pressure of the media, full displacement compensation is formed on each circumferential node in the axial direction, the temperature of each circumferential position of the sealing ring is consistent, the stress is uniform, self-tightening sealing of the sealing ring is achieved, and the problem of leakage of shell-and-tube multi-pass heat exchanger sealing equipment is effectively solved.

Drawings

FIG. 1 is a schematic diagram of one embodiment of the self-energizing seal assembly of the present invention, mounted on a shell and tube multi-pass heat exchanger;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at B;

FIG. 4 is an enlarged view of a portion of FIG. 2 at C;

FIG. 5 is a schematic structural view of the self-energizing seal assembly of the present invention;

FIG. 6 is a partial cross-sectional view taken at D-D of FIG. 5;

fig. 7 is a partial cross-sectional view taken at E-E of fig. 5.

Wherein: 1. a first flange; 11. a heat exchange conduit; 12. mounting a boss; 13. a cooling medium chamber; 14. a through hole;

2. a second flange; 21. A pipe box; 211. a liquid inlet pipe box; 212. a liquid outlet pipe box; 213a, 213b, 213c, an intermediate header; 22. mounting grooves; 23. a partition plate;

3. a seal assembly; 31. an inner support ring; 311. a medium introduction hole; 312. an inner sidewall; 313. an outer sidewall; 314. a sealing layer; 315. a ring body; 316. ribs; 317. a bore; 32. an outer support ring; 33. a seal ring; 331. a hollow interior cavity; 332. an open slot; 34. a spring.

Detailed Description

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

In order to illustrate the specific structure and application scenario of the self-tightening sealing assembly of the present invention, in this embodiment, an 8-tube shell-and-tube heat exchanger with the self-tightening sealing assembly installed therein will be described as an example.

Referring to the figures, a shell-and-tube multipass heat exchanger is shown, which comprises a first flange 1, a second flange 2 with a medium cavity, and a sealing assembly 3 for axially sealing connection between the first flange 1 and the second flange 2, wherein the first flange 1 can be also called a multi-cavity cooler and is provided with a cooling cylinder with a plurality of cooling cavities at the upper part and a flange connecting part closed at the bottom end part of the cooling cylinder; the second flange 2 may also be referred to as an autoclave with a flange connection, and for convenience of reference herein, will be referred to simply as the first flange 1 and the second flange 2, respectively.

The medium cavity comprises a plurality of pipe boxes 21 which are arranged on the second flange 2 and are mutually separated, and a plurality of heat exchange pipelines 11 which are communicated with two adjacent pipe boxes 21 are arranged on the first flange 1. Specifically, referring to fig. 1 and 2, a plurality of partition plates 23 are provided in the medium chamber, and all of the partition plates 23 divide the medium chamber into a plurality of header tanks 21. Specifically, in the 8-tube-pass shell-and-tube heat exchanger shown in this embodiment, the tube box 21 includes a liquid inlet tube box 211, a liquid outlet tube box 212, and three intermediate tube boxes 213a, 213b, and 213c, the medium passes through the liquid inlet tube box 211, the intermediate tube box 213a, the intermediate tube box 213b, the intermediate tube box 213c, and the liquid outlet tube box 212 in sequence along the input direction, and the medium introducing hole 311 is communicated with the liquid inlet tube box 211; the second flange 2 is further provided with a medium inlet 2a communicated with the liquid inlet pipe box 211 and a medium outlet 2b communicated with the liquid outlet pipe box 212.

The upper portion of the first flange 1 is provided with a cooling medium cavity 13, the heat exchange pipelines 11 are located in the cooling medium cavity 13, the first flange 1 is further provided with through holes 14, the number of the through holes 14 is the same as that of the heat exchange pipelines 11, the heat exchange pipelines 11 and the through holes 14 are correspondingly connected with each other so as to be communicated with the pipe boxes 21, and high-temperature media in the pipe boxes 21 are cooled through heat exchange when passing through the cooling medium cavity 13 through the heat exchange pipelines 11. Specifically, the specific flow direction of the high-temperature and high-pressure tube pass medium refers to the flow direction of the tube pass medium in the attached figure 1.

Referring to fig. 5 to 7, the sealing assembly 3 includes an inner support ring 31, an outer support ring 32, and a sealing ring 33 disposed between the inner support ring 31 and the outer support ring 32, wherein the inner support ring 31 is provided with a medium introducing hole 311, the medium introducing hole 311 penetrates through an inner sidewall 312 and an outer sidewall 313 of the inner support ring 31, the sealing ring 33 has a hollow inner cavity 331, an annular spring 34 is disposed in the hollow inner cavity 331, an inner peripheral portion of the sealing ring 33 is provided with an open slot 332 communicating with the hollow inner cavity 331, and one of the channel boxes 21 communicates with the hollow inner cavity 331 through the medium introducing hole 311 and the open slot 332.

Specifically, the inner support ring 31 includes a ring body 315 having an inner hole, and at least one rib 316 fixedly disposed on the ring body 315, sealing layers 314 are fixedly disposed on both end surfaces of the inner support ring 31 in the height direction, the inner hole of the ring body 315 is divided into a plurality of cavities 317 that are not communicated with each other by all the ribs 316, and the number and positions of the tube boxes 21 and the cavities 317 are in one-to-one correspondence. In this embodiment, the number and arrangement of the ribs 316 and the partition plates 23 are the same from the top view, so as to ensure that the number and positions of the cavities 317 and the tube boxes 21 are corresponding, that is, 5 cavities 317 are correspondingly provided.

The medium introduction hole 311 is located on the ring body 315, and the medium introduction hole 311 extends in the radial direction of the inner support ring 31; the sealing layer 314 is a flexible graphite layer or a soft metal layer and is used for sealing connection between the partition plate 23 and the first flange 1, so that a plurality of cavities 317 can be isolated, and media among the cavities 317 are prevented from being exchanged; the ribs 316 have a height corresponding to the height of the ring body 315, and both end faces are flush in the height direction. In the present embodiment, the medium introducing hole 311 is provided with one and only communicates with one of the cavities 317. Of course, in other embodiments, there may be more than one medium inlet 311, but all medium inlets 311 need to be connected to the same bore 317.

The sealing ring 33 is made of metal or nonmetal materials and has certain strength, the outer surface of the sealing ring 33 can be coated with soft materials such as silver, aluminum copper and the like, the notch of the opening groove 332 of the sealing ring 33 penetrates and extends along the circumferential direction of the sealing ring 33, namely, the cross section of the sealing ring 33 is in a C-shaped structure, so that the sealing ring 33 has certain elasticity, namely, the sealing ring 33 can provide certain sealing stress in the working process; the opening groove 332 is communicated with the medium introducing hole 311, the spring 34 is bent into a ring shape by a cylindrical spring, the spring 34 itself has a gap structure, so that a pressure medium can enter the hollow inner cavity 331 of the sealing ring 33 through the medium introducing hole 311, the pressure medium presses the hollow inner cavity 331 to provide a sealing stress required by the sealing assembly 3, and the outer peripheral part of the spring 34 abuts against the inner cavity wall of the hollow inner cavity 331, so that the spring 34 can also provide a certain sealing stress, and thus, the self-tightening sealing assembly can form multiple sealing stresses; the outer peripheral portion of the seal ring 33 is clearance-fitted to the inner peripheral portion of the outer support ring 32.

Referring to fig. 1 to 4, a mounting protrusion 12 is formed on the first flange 1, a mounting groove 22 is formed on the second flange 2, the sealing member 3 is disposed in the mounting groove 22, the mounting protrusion 12 is fittingly inserted into the mounting groove 22 and pressed against the sealing member 3, the first flange 1 and the second flange 2 are axially connected by bolts, and sealing layers 314 are disposed on both side axial end surfaces of the inner support ring 31 such that the inner support ring 31 is sealingly connected between the mounting groove 22 and the mounting protrusion 12.

The sealing principle of the self-tightening sealing assembly in the embodiment is as follows:

the first flange 1 and the second flange 2 are axially connected through bolts, the sealing assembly 3 is arranged in the mounting groove 22, the mounting protrusion 12 is inserted into the mounting groove 22 to press the sealing assembly 3 in the mounting groove 22, and the sealing ring 33 is in contact with the first flange 1 and the second flange 2 to form initial sealing stress. After the heat exchanger starts to operate, a medium under pressure in the liquid inlet pipe box 211 enters the hollow inner cavity of the sealing ring 33 through the medium introducing hole 311 and the open slot 332, and with the increase of the working temperature and the pressure, the medium in the sealing ring 33 generates a self-tightening stress Fa from inside to outside, and under the action of the self-tightening stress Fa, the contact stress Fg on the contact surfaces of the sealing ring 33 and the two flanges is gradually increased, so that self-tightening sealing is realized.

In this embodiment, the tube-pass thermal fluid medium enters the liquid inlet channel 211 from the medium inlet 2a, enters the liquid outlet channel 212 after multi-pass heat exchange, and finally flows out from the medium outlet 2 b. The temperature of the tube pass hot fluid medium is gradually reduced in the process of flowing through the liquid inlet tube box 211, the middle tube box 213a, the middle tube cavity 213b, the middle tube cavity 213c and the liquid outlet tube box 212, the temperatures of the different tube boxes 21 in the circumferential direction are different, specifically, the temperatures of the joints of the first flange 1 and the second flange 2 with the liquid inlet tube box 211 are the highest, the temperature of the joints with the liquid outlet tube box 212 is the lowest, and the temperatures of the joints with the middle tube box 213a, the middle tube box 213b and the middle tube box 213c are gradually reduced, so that the thermal expansion of joint elements such as bolts and flanges is different, the generated deformation is inconsistent, and the sealing stress of the sealing assembly 3 is. And through the self-tightening function of the sealing ring 33, sufficient displacement compensation can be formed on each node in the circumferential direction in the axial direction, so that the continuous and effective sealing is ensured.

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 (10)

1. A self-clinching seal assembly, comprising: the self-tightening sealing assembly comprises an inner supporting ring, an outer supporting ring and a sealing ring arranged between the inner supporting ring and the outer supporting ring, wherein a medium introducing hole is formed in the inner supporting ring and penetrates through the inner side wall and the outer side wall of the inner supporting ring, the sealing ring is provided with a hollow inner cavity, a circular ring-shaped spring is arranged in the hollow inner cavity, an open groove communicated with the hollow inner cavity is formed in the periphery of the inner side of the sealing ring, and the medium introducing hole is communicated with the open groove.

2. The self-clinching seal assembly of claim 1, wherein: the notch of the open slot extends through along the circumferential direction of the sealing ring.

3. The self-clinching seal assembly of claim 1, wherein: the cross section of the sealing ring is of a C-shaped structure.

4. The self-clinching seal assembly of claim 1, wherein: the outer periphery of the spring is attached to the inner cavity wall of the hollow inner cavity.

5. The self-clinching seal assembly of claim 1, wherein: the outer peripheral portion of the seal ring is in clearance fit with the inner peripheral portion of the outer support ring.

6. The self-clinching seal assembly of claim 1, wherein: and sealing layers are fixedly arranged on two end faces of the inner support ring in the height direction.

7. The self-clinching seal assembly of claim 6, wherein: the sealing layer is a flexible graphite layer or a flexible metal layer.

8. The self-clinching seal assembly of claim 1, wherein: the medium introduction hole extends in a radial direction of the inner support ring.

9. The self-clinching seal assembly of any of claims 1 to 8, wherein: the inner support ring comprises a ring body with an inner hole and at least one rib fixedly arranged on the ring body, the inner hole of the ring body is divided into a plurality of cavities which are not communicated with each other by all the ribs, one or more medium introducing holes are arranged, and all the medium introducing holes are communicated with one of the cavities.

10. The self-clinching seal assembly of claim 9, wherein: the height of the ribs is consistent with that of the ring body, and two end faces in the height direction are respectively flush.

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