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CN-224214894-U - Pressure self-tightening middle flange high-temperature leakage-proof sealing structure

CN224214894UCN 224214894 UCN224214894 UCN 224214894UCN-224214894-U

Abstract

The utility model relates to the technical field of flange sealing structures, in particular to a high-temperature leakage-proof sealing structure of a pressure self-tightening middle flange, which comprises a lower flange and an upper flange, wherein the lower flange and the upper flange are connected through a fixing component, a sealing component is arranged between the lower flange and the upper flange, the lower flange comprises an arc-shaped surface first bearing surface facing the upper flange, a sealing piece is arranged in the middle of the lower flange, the sealing piece comprises a first bearing surface facing the first bearing surface and a second bearing surface facing the upper flange, a first sealing groove is formed in the middle of the first bearing surface, a second sealing groove is formed in the middle of the second bearing surface, a secondary sealing ring is clamped in the middle of the first sealing groove, a main sealing ring is clamped in the middle of the second sealing groove, and the self-tightening sealing of the sealing piece is realized through pressure when the self-tightening sealing device is used, and sealing treatment is carried out on a flange joint through the mutual matching of the sealing components, so that the sealing reliability and stability are greatly improved.

Inventors

  • ZHU XIAOQI
  • YANG JIANBO
  • DONG WANBING

Assignees

  • 无锡和佳仪器仪表有限公司

Dates

Publication Date
20260508
Application Date
20250520

Claims (7)

  1. 1. The utility model provides a flange high temperature leak protection seal structure in pressure self-tightening, its characterized in that includes lower flange (1) and last flange (3), connect through fixed subassembly (5) between lower flange (1) and the last flange (3), be provided with seal assembly (4) between lower flange (1) and the last flange (3), lower flange (1) is including face up the first face of bearing (102) of arc of flange (3), the middle part of lower flange (1) is provided with sealing member (2), sealing member (2) include first face of bearing (201) and face up second face of bearing (202) of flange (3) towards first face of bearing (102), first seal groove (203) have been seted up at the middle part of first face of bearing (201), second seal groove (204) have been seted up at the middle part of second face of bearing (202), the middle part joint of first seal groove (203) has vice sealing washer (205), the middle part joint of second seal groove (204) has main sealing washer (206).
  2. 2. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 1, wherein the first bearing surface (102) and the first bearing surface (201) are in mutual abutting connection, the cross section of the first sealing groove (203) is of a C shape, the cross section of the second sealing groove (204) is of a trapezoid shape, and the shape of the auxiliary sealing ring (205) is matched with that of the first sealing groove (203).
  3. 3. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 2, wherein the upper flange (3) comprises a second bearing surface (301) facing the lower flange (1), the second bearing surface (301) and the second bearing surface (202) are mutually abutted, a third sealing groove (302) is formed in the middle of the second bearing surface (301), the shape of the third sealing groove (302) is the same as that of the second sealing groove (204), and the shape of the main sealing ring (206) is matched with that of the second sealing groove (204) and the third sealing groove (302).
  4. 4. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 1, wherein a water outlet pipe (101) is fixedly connected to the bottom end of the lower flange (1), a water inlet pipe (304) is fixedly connected to the top end of the upper flange (3), and the pipe diameter of the water inlet pipe (304) is slightly smaller than that of the water outlet pipe (101).
  5. 5. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 1, wherein the sealing assembly (4) comprises a first sealing half ring (401) and a second sealing half ring (402), a connecting area (403) is arranged at the joint of the first sealing half ring (401) and the second sealing half ring (402), and the connecting area (403) is spliced by a labyrinth.
  6. 6. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 1, wherein the fixing assembly (5) comprises a fixing bolt (501), a belleville spring (502) is sleeved on the surface of the fixing bolt (501), and a fixing nut (503) is connected to the top end of the fixing bolt (501) in a threaded mode.
  7. 7. The pressure self-tightening middle flange high-temperature leakage-proof sealing structure according to claim 6, wherein a plurality of first through holes (103) are uniformly formed in the surface of the lower flange (1), a plurality of second through holes (303) are uniformly formed in the surface of the upper flange (3), a plurality of third through holes (404) are uniformly formed in the surfaces of the first sealing half ring (401) and the second sealing half ring (402), and the fixing bolts (501) sequentially penetrate through the first through holes (103), the third through holes (404) and the second through holes (303).

Description

Pressure self-tightening middle flange high-temperature leakage-proof sealing structure Technical Field The utility model relates to the technical field of flange sealing structures, in particular to a pressure self-tightening middle flange high-temperature leakage-proof sealing structure. Background The flange, namely flange disc or flange, is a part for connecting shafts and connecting pipe ends, and is also used for connecting equipment inlets and outlets, such as a speed reducer flange, a flange connection or a flange joint, and is a detachable connection formed by connecting the flange, a gasket and bolts together to form a group of combined sealing structures. In the industrial fields of petrochemical industry, electric power and the like, the middle flange connection structure of the pipeline and equipment is widely applied, under the working environment of high temperature and high pressure, the traditional middle flange sealing structure mainly depends on bolt pretightening force to realize sealing, however, along with the increase of the running time of the equipment, the high temperature can lead to creep and aging of sealing materials, and the bolt can also lead to pretightening force reduction due to thermal expansion and contraction and relaxation, so that the sealing performance is reduced, the leakage problem occurs, once leakage occurs, medium loss can be caused, safety accidents such as fire, explosion, leakage of toxic and harmful media and the like can be caused, and serious threat is caused to production safety and environment. At present, some existing improved sealing structures are complex in structure, high in manufacturing cost and inconvenient to install and maintain, or sealing effect is limited to improve, and the requirements of long-term stable operation cannot be met. Disclosure of utility model Aiming at the defects in the prior art, the utility model provides a pressure self-tightening middle flange high-temperature anti-leakage sealing structure, which can effectively solve the problems in the background art. In order to achieve the above purpose, the utility model is realized by the following technical scheme: The utility model provides a high-temperature leakage-proof sealing structure of a pressure self-tightening middle flange, which comprises a lower flange and an upper flange, wherein the lower flange and the upper flange are connected through a fixing assembly, a sealing assembly is arranged between the lower flange and the upper flange, the lower flange comprises an arc-shaped surface first bearing surface facing the upper flange, a sealing element is arranged in the middle of the lower flange, the sealing element comprises a first bearing surface facing the first bearing surface and a second bearing surface facing the upper flange, a first sealing groove is formed in the middle of the first bearing surface, a second sealing groove is formed in the middle of the second bearing surface, a secondary sealing ring is clamped in the middle of the first sealing groove, and a main sealing ring is clamped in the middle of the second sealing groove. Further, the first bearing surface and the first bearing surface are mutually abutted, the cross section of the first sealing groove is C-shaped, the cross section of the second sealing groove is trapezoid, and the shape of the auxiliary sealing ring is matched with that of the first sealing groove. Further, the upper flange comprises a second bearing surface facing the lower flange, the second bearing surface and the second bearing surface are mutually abutted, a third sealing groove is formed in the middle of the second bearing surface, the shape of the third sealing groove is the same as that of the second sealing groove, and the shape of the main sealing ring is matched with the second sealing groove and the third sealing groove. Further, the bottom fixedly connected with outlet pipe of lower flange, the top fixedly connected with inlet tube of upper flange, the pipe diameter of inlet tube is slightly less than the pipe diameter of outlet pipe. Further, the sealing assembly comprises a first sealing half ring and a second sealing half ring, a connecting area is arranged at the joint of the first sealing half ring and the second sealing half ring, and the connecting area is spliced by mazes. Further, the fixed subassembly includes fixing bolt, and fixing bolt's surface cup joints belleville spring, and fixing bolt's top threaded connection has fixation nut. Further, a plurality of first through holes are uniformly formed in the surface of the lower flange, a plurality of second through holes are uniformly formed in the surface of the upper flange, a plurality of third through holes are uniformly formed in the surfaces of the first sealing half ring and the second sealing half ring, and fixing bolts sequentially penetrate through the first through holes, the third through holes and the second through holes. Compared with the p