CN214222014U

CN214222014U - Medium self-tightening sealing device

Info

Publication number: CN214222014U
Application number: CN202023280460.4U
Authority: CN
Inventors: 马志刚; 韩嘉兴
Original assignee: Suzhou Bmc Sealing Technology Co ltd
Current assignee: Suzhou Bmc Sealing Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-17
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a medium is from compact form sealing device, including treating sealing connection's first part and second part, and be used for axial seal's seal assembly between first part and the second part, seal assembly sets up between first seal face and second seal face along the axial, at least one has the medium chamber in first part and the second part, seal assembly includes the inner support ring, outer support ring, and have the sealing ring of cavity inner chamber, the sealing ring is established between inner support ring and outer support ring including, wherein, the hole has been introduced to the medium on the inner support ring, the hole runs through the inner support ring to the medium, set up the medium of intercommunication cavity inner chamber on the inboard week portion of sealing ring and lead to the hole, the hole is introduced to the medium chamber and the hole is led to the medium. The utility model discloses a sealing device, medium form from the stress of holding in the sealing ring, realize from the tight seal for seal assembly can all the time with first part and second part in close contact with, sealed effectual.

Description

Medium self-tightening sealing device

Technical Field

The utility model relates to a sealed field especially relates to a medium self-clinching formula sealing device.

Background

In high-temperature and high-pressure equipment such as a heat exchanger, the quality of the sealing performance of a sealing device has an important influence on the working efficiency of the equipment. In a conventional sealing device, a flange is usually used to press a sealing gasket between components to be sealed, wherein the sealing gasket includes a wound gasket, a wrapped gasket, and the like. Taking a shell-and-tube multi-pass heat exchanger as an example, in actual operation, because of objective temperature difference between passes, the temperatures of flange parts corresponding to the multiple passes from the inlet to the outlet of the heat exchanger are inconsistent, so that thermal stress inside the flange can be formed, axial deformation of each circumferential node of the flange is inconsistent, local loss of circumferential sealing working stress of different circumferential nodes of the sealing gasket is caused, and sealing leakage is caused, especially the leakage is easier as the number of tube passes is larger.

Disclosure of Invention

The utility model aims at providing a medium self-clinching formula sealing device that sealing performance is good to the problem that causes the leakage because the medium temperature difference leads to the different node heat distortion of seal assembly different among the prior art.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a medium self-tightening sealing device comprises a first component and a second component to be connected in a sealing mode, and a sealing assembly used for axially sealing between the first component and the second component, wherein the first component is provided with a first sealing end face, the second component is provided with a second sealing end face, the sealing assembly is arranged between the first sealing end face and the second sealing end face along the axial direction, at least one of the first component and the second component is provided with a medium cavity, the sealing assembly comprises an inner supporting ring, an outer supporting ring and a sealing ring with a hollow inner cavity, the sealing ring is arranged between the inner supporting ring and the outer supporting ring, 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, and a medium introducing hole communicated with the hollow inner cavity is formed in the inner side peripheral portion of the sealing ring, the medium introducing hole communicates the medium chamber with the medium access hole.

Preferably, the medium access hole has a plurality of holes arranged at intervals in a circumferential direction of the seal ring.

Preferably, the inner diameter of the sealing ring is larger than the outer diameter of the inner support ring.

Further, the inner peripheral portion of the seal ring and the outer side wall of the inner support ring are provided with a gap all the time in the radial direction, and the medium introduction hole are communicated through the gap.

Preferably, sealing layers are fixedly arranged on two end faces of the inner support ring in the height direction, one sealing layer is in sealing contact with the first sealing end face, and the other sealing layer is in sealing contact with the second sealing end face.

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

Preferably, the inner support ring comprises a ring body with an inner hole, and at least one rib fixedly arranged on the ring body, wherein 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 formed in each medium introducing hole, and all the medium introducing holes are communicated with only one of the cavities.

Furthermore, the medium cavity comprises a plurality of sub-cavities which are arranged on the second component and are mutually separated, and the number and the positions of the sub-cavities are in one-to-one correspondence with those of the pore cavities.

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

Further, a mounting groove is formed in the first component, a mounting protrusion is formed in the second component, the mounting protrusion can be fittingly inserted into the mounting groove, the sealing assembly is arranged in the mounting groove, and the mounting protrusion is inserted into the mounting groove and tightly pressed on the sealing assembly.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage: the utility model discloses a medium is from compact form sealing device, the medium in the medium chamber introduces hole and medium through the medium and passes through the hole and enter into in the sealing ring, forms the stress of being tight from of sealing ring, and sealing ring circumference temperature unanimous everywhere, the atress is even, realizes sealing tightly for seal assembly can all the time with first part and second part in close contact with, sealed effectual.

Drawings

FIG. 1 is a schematic view of an embodiment of the self-tightening sealing device for media of the present invention;

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

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

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

FIG. 5 is a schematic view of a seal assembly of the present embodiment;

FIG. 6 is a cross-sectional view taken along line D-D of FIG. 5;

FIG. 7 is a cross-sectional view E-E of FIG. 5;

wherein: 1. a first member; 11. a heat exchange conduit; 12. mounting a boss;

2. a second component; 211. a sub-cavity; 2111. a liquid inlet pipe box; 2112 (2112 a, 2112b, 2112 c), an intermediate header; 2113. a liquid outlet pipe box; 212. a partition plate; 22. a media inlet; 23. a media outlet; 24. mounting grooves;

3. a seal assembly; 31. an inner support ring; 311. a ring body; 312. ribs; 31a, a sealing layer; 310. a medium introduction hole; 32. an outer support ring; 33. a seal ring; 330. a medium access hole;

4. a shell side shell.

Detailed Description

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

This embodiment uses shell-and-tube multi-pass heat exchanger as an example, explains the utility model discloses a concrete structure and theory of operation of medium self-tightening sealing device when practical application.

Referring to fig. 1 and 2, a shell-and-tube multi-pass heat exchanger is provided with a medium self-tightening sealing device, the sealing device comprises a first component 1 and a second component 2 which are in sealing connection, and a sealing assembly 3 used for axially sealing connection between the first component 1 and the second component 2, the first component 1 is provided with a first sealing end face, the second component 2 is provided with a second sealing end face, the sealing assembly 3 is axially arranged between the first sealing end face and the second sealing end face, and at least one of the first component 1 and the second component 2 is provided with a medium cavity.

In this embodiment, the first component 1 and the second component 2 are both flanges, and the first sealing end face and the second sealing end face are two shaft end faces matched with the two flanges respectively. The medium chamber is arranged on the second component 2, which second component 2 is embodied as an autoclave with a flanged connection. The medium cavity comprises a plurality of mutually-separated sub-cavities 211, the first component 1 is provided with a plurality of heat exchange pipelines 11 for communicating the two adjacent sub-cavities 211, the 8-pass heat exchanger is exemplified in the embodiment, the heat exchanger further comprises a shell-side shell 4 hermetically connected with the first component 1, the shell-side shell 4 and the first flange 1 form a multi-cavity cooler, and all the heat exchange pipelines 11 extend into the shell-side shell 4, so that heat exchange can be realized between a high-temperature high-pressure tube-side medium and a low-temperature shell-side medium in the shell-side shell 4.

The medium cavity is provided with a plurality of partition plates 212 which divide the medium cavity into a plurality of sub-cavities 211, the sub-cavities 211 of the heat exchanger of the embodiment are also called as tube boxes, the plurality of tube boxes 211 specifically comprise a liquid inlet tube box 2111, a liquid outlet tube box 2113 and three middle tube boxes 2112, and tube pass media sequentially pass through the liquid inlet tube box 2111, the middle tube box 2112a, the middle tube box 2112b, the middle tube box 2112c and the liquid outlet tube box 2113 along the input direction; the second component 2 is also provided with a medium inlet 22 communicated with the liquid inlet pipe box 2111 and a medium outlet 23 communicated with the liquid outlet pipe box 2113. Tube pass media sequentially flow through the sub-cavities 211 and the heat exchange pipeline 11 in the direction indicated by an arrow in fig. 1, and are subjected to heat exchange and temperature reduction step by step through 8 tube passes, the temperature of the tube pass media in the liquid inlet tube box 2111 is highest, the temperature of the tube pass media in the liquid outlet tube box 2113 is lowest, the circumferential heating imbalance of the second component 2 is easily caused, and the sealing gasket between the first component 1 and the second component 2 is easily subjected to the problems of sealing failure such as local tilting and the like.

Referring to fig. 3 and 7, the seal assembly 3 of the present embodiment includes an inner support ring 31, an outer support ring 32, and a seal ring 33 having a hollow inner cavity, wherein the seal ring 33 is disposed between the inner support ring 31 and the outer support ring 32.

The inner support ring 31 includes a ring body 311 having an inner hole, and at least one rib 312 fixedly disposed on the ring body 311, in this embodiment, there are 4 ribs 312 as shown in fig. 5, all the ribs 312 divide the inner hole of the ring body 311 into a plurality of cavities that are not communicated with each other, and the sub-cavities 211 are in one-to-one correspondence with the number and positions of the cavities. The rib 312 is connected between the partition 212 and the first member 1 in a sealing manner, the height of the rib 312 is the same as the height of the ring 311, and two end surfaces in the height direction are flush with each other, so as to provide support for the ring 311 and the whole sealing assembly 3.

As shown in fig. 3 and 6, the inner support ring 31 is provided with a medium introduction hole 310, the medium introduction hole 310 penetrates through the inner side wall and the outer side wall of the inner support ring 31, and the medium introduction hole 310 extends in the radial direction of the inner support ring. The inner periphery of the sealing ring 33 is opened with one or more medium inlet holes 330 communicating with the hollow inner cavity, all the medium inlet holes 310 are communicated with the same sub-cavity 211, the sub-cavity 211 is communicated with the medium inlet hole 330 through the medium inlet holes 310, in this embodiment, the medium inlet holes 310 are specifically communicated with the liquid inlet channel 2111, and the medium inlet holes 330 are provided with a plurality of holes arranged at intervals along the circumferential direction of the sealing ring 33, so that the high-temperature channel medium in the liquid inlet channel 2111 can be injected into and fill the inner cavity of the sealing ring 33.

Specifically, the inner diameter of the seal ring 33 is larger than the outer diameter of the inner support ring 31, the inner peripheral portion of the seal ring 33 and the outer side wall of the inner support ring 31 are arranged with a gap therebetween in the radial direction all the time, and the medium introduction hole 310 and the medium passage hole 330 communicate with each other via a gap therebetween; the outer peripheral portion of the seal ring 33 is clearance-fitted to the inner peripheral portion of the outer support ring 32. Thus, a space for radial deformation of the seal ring 33 is provided between the inner support ring 31 and the outer support ring 32, and both axial end faces of the seal ring 33 always abut against the first member 1 and the second member 2.

In this embodiment, the first member 1 is formed with a mounting protrusion 12, the second member 2 is formed with a mounting groove 24, the sealing assembly 3 is disposed in the mounting groove 24, the mounting protrusion 12 is fittingly inserted into the mounting groove 24 and pressed against the sealing assembly 3, two end surfaces of the inner support ring 31 in the height direction are each provided with a sealing layer 31a, so that the inner support ring 31 is sealingly connected between the mounting groove 24 and the mounting protrusion 12, one sealing layer 31a is in sealing contact with the first sealing end surface, and the other sealing layer 31a is in sealing contact with the second sealing end surface, where the sealing layer 31a is specifically a flexible graphite layer or a flexible metal layer.

It should be noted that the inner support ring 31, the outer support ring 32 and the sealing ring 33 all have certain strength, wherein the sealing ring 33 also has certain rigidity, and all of the inner support ring 31, the outer support ring 32 and the sealing ring 33 can be made of metal or nonmetal materials, preferably metal materials. The outer wall surface of the sealing ring 33 may be covered with a soft material, such as silver, aluminum, copper, or the like, or may be electroplated with silver, copper, or the like, so that the sealing ring 33 is in close contact with the adjacent end surfaces of the first component 1 and the second component 2.

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

by bolting the first and

second components

1, 2 axially against the seal assembly 3, the seal ring 33 contacts the first and

second components

1, 2 and creates an initial sealing stress. After the heat exchanger starts to operate, the pressure medium in the liquid inlet pipe box 2111 enters the inner cavity of the sealing ring 33 through the medium introducing hole 310 and the medium introducing hole 330, the medium in the sealing ring 33 generates self-tightening stress Fa from inside to outside along with the increase of the working temperature and the pressure, and under the action of the self-tightening stress Fa, the contact stress Fg between the sealing ring 33 and the two sealing end surfaces is gradually increased, so that self-tightening sealing is realized.

In the medium self-tightening sealing device of this embodiment, after the hot fluid medium is subjected to multi-pass heat exchange, the temperature is gradually reduced, the temperatures of different sub-cavities 211 in the circumferential direction are different, specifically, the temperature of the joints between the first component 1 and the second component 2 and the liquid inlet pipe box 2111 is the highest, the temperature of the joints between the first component and the liquid outlet pipe box 2113 is the lowest, and the temperature of the joints between the first component and the second component and the joints between the first component and the liquid outlet pipe box 2112a, between the first component and the second component is the lowest, and between the first component and the second component and the joints between the first component and the second component are the lowest, and the temperature of the joints between the first component and the second component is the highest, between the first component and the second component and the middle pipe box 2112b, and between the middle pipe box 2112c, and between the middle pipe box 2112a temperature distribution is unbalanced in the circumferential direction, so that thermal expansion of joint elements such as bolts and flanges is different, deformation is generated, and the sealing stress of the sealing ring 33 is uneven and the sealing stress is uneven, and the sealing is uneven, which is not uniform and effective continuously ensured.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot 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 by the protection scope of the present invention.

Claims

1. A media self-energizing seal arrangement comprising a first component and a second component to be sealingly connected, the first component having a first sealing end face, the second component having a second sealing end face, and a seal assembly for axially sealing between the first component and the second component, the seal assembly being axially disposed between the first sealing end face and the second sealing end face, at least one of the first component and the second component having a media cavity, the arrangement characterized by:

the sealing assembly comprises an inner supporting ring, an outer supporting ring and a sealing ring with a hollow inner cavity, wherein the sealing ring is arranged between the inner supporting ring and the outer supporting ring, 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, a medium introducing hole communicated with the hollow inner cavity is formed in the peripheral portion of the inner side of the sealing ring, and the medium introducing hole is communicated with the medium cavity and the medium introducing hole.

2. The media self-energizing seal according to claim 1, wherein: the medium access hole has a plurality of holes arranged at intervals in a circumferential direction of the seal ring.

3. The media self-energizing seal according to claim 1, wherein: the inner diameter of the sealing ring is larger than the outer diameter of the inner support ring.

4. The media self-energizing seal according to claim 3, wherein: the inner peripheral portion of the seal ring and the outer side wall of the inner support ring are arranged with a gap in the radial direction all the time, and the medium introducing hole are communicated through the gap.

5. The media self-energizing seal according to claim 1, wherein: sealing layers are fixedly arranged on two end faces of the inner support ring in the height direction, one sealing layer is in sealing contact with the first sealing end face, and the other sealing layer is in sealing contact with the second sealing end face.

6. The media self-energizing seal according to claim 1, wherein: the outer side periphery of the sealing ring is in clearance fit with the inner side periphery of the outer supporting ring.

7. The media self-clinching seal of any of claims 1 to 6, 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 formed, and all the medium introducing holes are communicated with one of the cavities.

8. The media self-energizing seal according to claim 7, wherein: the medium cavity comprises a plurality of sub-cavities which are arranged on the second component and mutually separated, and the number and the positions of the sub-cavities are in one-to-one correspondence with those of the pore cavities.

9. The media self-energizing seal according to claim 7, 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.

10. The media self-energizing seal according to claim 7, wherein: the sealing component is characterized in that a mounting groove is formed in the first component, a mounting protrusion is formed in the second component, the mounting protrusion can be inserted into the mounting groove in a matched mode, the sealing component is arranged in the mounting groove, and the mounting protrusion is inserted into the mounting groove and tightly pressed on the sealing component.