CN214248306U

CN214248306U - Medium self-tightening sealing device

Info

Publication number: CN214248306U
Application number: CN202023275755.2U
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: 2021-09-21
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a medium is from compact form sealing device, including the first part, the second part that has the medium chamber, and be used for axial sealing connection's seal assembly between first part and the second part, the medium chamber is including setting up on the second part and a plurality of pipe casees of mutual separation each other, be provided with many heat transfer pipeline of two adjacent pipe casees of intercommunication on the first part, seal assembly includes inner support ring, outer support ring, and the sealing ring between support ring and the outer support ring including setting up, the sealing ring has the cavity inner chamber, it has the annular spring of being circle to embed in the cavity inner chamber. Wherein, the inner supporting ring is provided with a medium introducing hole, and the hollow inner cavity of the sealing ring is communicated with a certain pipe box, so that the temperature of all the circumferential parts of the sealing ring is the same. The utility model discloses a medium self-tightening sealing device passes through seal assembly's self-tightening function, can compensate because the axial discordance deformation that different temperatures caused, has guaranteed sealed lasting effectively.

Description

Medium self-tightening sealing device

Technical Field

The utility model relates to a medium self-tightening sealing device.

Background

In the fields of nuclear power, petrochemical industry and the like, the heat exchanger is used as common equipment, and the sealing performance of a sealing device of the heat exchanger has an important influence on the working efficiency of the equipment. Among the traditional sealing device, adopt the winding pad more, the sealed pad such as cladding pad seals up the flange, in the course of the work, because the difference in temperature that objectively exists between the journey, cause the flange position temperature inconsistent that entry to export multipass correspond, form the inside thermal stress of flange, and can lead to the axial deformation inconsistent of each node of flange circumference, cause the local disappearance of the sealed operating stress of the different nodes of seal gasket circumference, thereby cause sealed leakage, and the tube pass is more moreover, take place the leakage more easily.

Disclosure of Invention

The utility model aims at providing a better medium self-clinching formula sealing device of sealing performance.

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 in sealing connection, and a sealing assembly used for axial 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 axially arranged between the first sealing end face and the second sealing end face, 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 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, the sealing ring is provided with a hollow inner cavity, and a circular ring-shaped spring is arranged in the hollow inner cavity, the inner side periphery of the sealing ring is provided with an open groove communicated with the hollow inner cavity, and the medium introducing hole is communicated with the hollow inner cavity through the medium introducing hole and the open groove.

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, 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.

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 simultaneously communicated with only one of the cavities.

Further preferably, the medium cavity comprises a plurality of pipe boxes which are arranged on the second part and are mutually separated, and the pipe boxes correspond to the hole cavities in number and position in a one-to-one mode.

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.

Further preferably, a mounting groove is formed on the first component, a mounting protrusion is formed on 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 open slot that the medium in the medium chamber was introduced on hole and the sealing ring through the medium enters into in the sealing ring, form the tight stress certainly of sealing ring, and sealing ring circumference temperature is unanimous everywhere, the atress is even, cooperate the elasticity of sealing ring self elasticity and spring simultaneously, thereby realize seal assembly's tight function certainly, form abundant displacement compensation to each node of circumference in the axial, make the sealed between first part and the second part inseparabler, and sealed effect lasts effectively.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the medium self-tightening sealing device according to the present invention;

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 a seal assembly in the medium self-tightening seal device 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 member; 11. a heat exchange conduit; 12. mounting a boss; 13. A cooling medium chamber; 14. a through hole;

2. a second component; 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 will be further explained with reference to the accompanying drawings and specific embodiments.

The shell-and-tube multi-pass heat exchanger is an application scene of the medium self-tightening sealing device, and the structural characteristics of the medium self-tightening heat exchange device will be specifically explained by taking the shell-and-tube multi-pass heat exchanger as an example.

Referring to the drawings, the medium self-tightening sealing device comprises a first component 1 and a second component 2 to be connected in a sealing mode, and a sealing assembly 3 for axially sealing between the first component 1 and the second component 2, wherein 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 arranged between the first sealing end face and the second sealing end face in the axial direction, and at least one of the first component 1 and the second component 2 is provided with a medium cavity.

The medium cavity is arranged on the second component 2, the medium cavity comprises a plurality of tube boxes 21 which are arranged on the second component 2 and are mutually separated, a plurality of heat exchange pipelines 11 for communicating two adjacent tube boxes 21 are arranged on the first component 1, and the embodiment takes an 8-tube-pass heat exchanger as an example for specific explanation.

In the 8-tube-pass heat exchanger, wherein the first component 1 can also be called a multi-chamber cooler, the multi-chamber cooler is provided with a cooling cylinder which is positioned at the upper part and is provided with a plurality of cooling chambers, and a flange connecting part which is closed at the bottom end part of the cooling cylinder; the second component 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 component 1 and the second component 2, respectively.

Referring to fig. 1 and 2, a plurality of partitions 23 are provided in the medium chamber, and all of the partitions 23 divide the medium chamber into a plurality of header boxes 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 member 2 is further provided with a medium inlet 2a communicating with the liquid inlet channel 211 and a medium outlet 2b communicating with the liquid outlet channel 212.

The upper portion of the first component 1 is provided with a cooling medium cavity 13, the heat exchange pipelines 11 are located in the cooling medium cavity 13, the first component 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 has 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, a ring-shaped spring 34 is disposed in the hollow inner cavity 331, an inner peripheral portion of the sealing ring 33 has an open slot 332 communicating with the hollow inner cavity 331, and one of the tube 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 for sealing connection between the partition plate 23 and the first member 1, thereby being capable of isolating the plurality of cavities 317 and preventing media between the cavities 317 from being interchanged; 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, the first member 1 is formed with a mounting protrusion 12, the second member 2 is formed with a mounting groove 22, 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 member 1 and the second member 2 are axially connected by a bolt, and both side axial end surfaces of the inner support ring 31 are provided with a sealing layer 314, so that the inner support ring 31 is sealingly connected between the mounting groove 22 and the mounting protrusion 12.

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

the first member 1 and the second member 2 are axially connected by a bolt, the seal assembly 3 is disposed in the mounting groove 22, and the mounting protrusion 12 is inserted into the mounting groove 22 to press the seal assembly 3 in the mounting groove 22 and the seal ring 33 is in contact with the first member 1 and the second member 2 and forms an 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 box 213b, the middle tube box 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 component 1 and the second component 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 not uniform. 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 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 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 slot 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 hollow inner cavity through the medium introducing hole and the open slot.

2. The media self-energizing seal according to claim 1, wherein: the notch of the open slot extends through along the circumferential direction of the sealing ring.

3. The media self-energizing seal according to claim 1, wherein: the cross section of the sealing ring is of a C-shaped structure.

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

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 peripheral portion of the seal ring is in clearance fit with the inner peripheral portion of the outer support 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 arranged, and all the medium introducing holes are simultaneously communicated with only one of the cavities.

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

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.