CN-224214892-U - Good flange structure for chemical industry pipeline of leakproofness

Abstract

The utility model belongs to the technical field of flanges, and particularly relates to a flange structure with good sealing performance for a chemical pipeline, which comprises a socket welding flange I, a socket welding flange II and a hollow sealing ring, wherein a circular ring is fixedly connected to the inner side of the socket welding flange I, a trapezoid ring is fixedly connected to one side of the circular ring, a circular groove is formed in the inner side of the socket welding flange II, a trapezoid ring groove is formed in the circular groove, a V-shaped gasket is arranged in the trapezoid ring groove, and the V-shaped gasket comprises a V-shaped part and a flat ring part. Through the setting of ring, its external diameter and internal diameter all equals with the circular slot to the circular ring gets into the inside shutoff that can carry out of circular slot, thereby is favorable to avoiding chemical industry liquid direct contact to V type packing ring, and V type position of V type packing ring is located between trapezoidal ring and the trapezoidal ring groove, and flat circle position is located between ring and the circular slot, so V type packing ring is better in ordinary flat circle sealed effect than, and the sealing performance can be guaranteed to trapezoidal ring through compressing tightly V type packing ring.

Inventors

• CAI DONGSEN
• CAI JUNYU
• ZHAO YUNHUI

Assignees

• 无锡市南洋环件法兰有限公司

Dates

Publication Date

20260508

Application Date

20250616

Claims (6)

1. 1. The flange structure for the chemical pipeline with good sealing performance comprises a socket welding flange I (1), a socket welding flange II (2) and a hollow sealing ring (3), and is characterized in that a circular ring (4) is fixedly connected to the inner side of the socket welding flange I (1), a trapezoid ring (5) is fixedly connected to one side of the circular ring (4), a circular groove (6) is formed in the inner side of the socket welding flange II (2), a trapezoid ring groove (7) is formed in the circular groove (6), a V-shaped gasket (8) is arranged in the trapezoid ring groove (7), the V-shaped gasket (8) comprises a V-shaped part (801) and a flat ring part (802), ring grooves (9) are formed in the inner sides of the socket welding flange I (1) and the socket welding flange II (2), the hollow sealing ring (3) comprises a loading part (301) and a diamond part (302), the loading part (301) can be embedded into the ring grooves (9), the inner side of the diamond part (302) is hollow, and air holes (303) are formed in the side of the hollow sealing ring (3).
2. 2. The flange structure for the chemical pipeline with good sealing performance according to claim 1 is characterized in that through holes (10) are formed in the surfaces of the first socket welding flange (1) and the second socket welding flange (2), bolts (11) are inserted into the through holes (10), and nuts (12) are installed on the surface threads of the bolts (11).
3. 3. The flange structure for chemical pipelines with good sealing performance according to claim 2, wherein washers I (13) are sleeved on the surface of the bolt (11), and the number of the washers I (13) corresponds to the number of the bolts (11) and the nuts (12).
4. 4. The flange structure for chemical pipelines with good sealing performance according to claim 2 is characterized in that a second gasket (14) is sleeved on the surface of the bolt (11), and the second gasket (14) is positioned between the first socket welding flange (1) and the second socket welding flange (2).
5. 5. The flange structure for chemical pipelines with good sealing performance according to claim 1, wherein the inner diameter and the outer diameter of the circular ring (4) and the circular groove (6) are equal.
6. 6. The flange structure for chemical pipelines with good sealing performance according to claim 1, wherein the loading parts (301) of the hollow sealing rings (3) are symmetrically arranged.

Description

Good flange structure for chemical industry pipeline of leakproofness Technical Field The utility model belongs to the technical field of flanges, and particularly relates to a flange structure for a chemical pipeline, which is good in sealing performance. Background The flange is a part for connecting pipes and pipe ends, also can be used on an inlet and an outlet of equipment and used for connecting two pieces of equipment, and the flange connection or flange joint refers to the detachable connection which is formed by connecting the flange, a gasket and a bolt mutually as a group of combined sealing structures. When chemical raw materials are conveyed, the chemical raw materials are conveyed by connecting pipelines, and when the pipelines are connected with each other, flanges are generally adopted for connection. Today, the technology of chemical technology is continuously improved, and parts are required to be connected when chemical liquid is transported, and flange connection is generally adopted due to high pipeline pressure. The existing flange is usually matched with a gasket, however, the gasket is mostly simpler in structural form, and the gasket is directly contacted with chemical liquid, so that the gasket is easily corroded by the chemical liquid for a long time, and the chemical liquid is leaked from the flange. Disclosure of utility model In order to solve the problems in the background technology, the utility model provides a flange structure for chemical pipelines, which has good sealing property, and solves the problem that gaskets are directly contacted with chemical liquid so as to be easily corroded by the chemical liquid for a long time. In order to achieve the purpose, the flange structure for the chemical pipeline with good sealing performance comprises a first socket welding flange, a second socket welding flange and a hollow sealing ring, wherein the inner side of the first socket welding flange is fixedly connected with a circular ring, one side of the circular ring is fixedly connected with a trapezoid annular ring, a circular groove is formed in the inner side of the second socket welding flange, a trapezoid annular groove is formed in the circular groove, a V-shaped gasket is arranged in the trapezoid annular groove, the V-shaped gasket comprises a V-shaped part and a flat annular part, annular grooves are formed in the inner sides of the first socket welding flange and the second socket welding flange, the hollow sealing ring comprises a loading part and a diamond-shaped part, the loading part can be embedded into the annular groove, the inner side of the diamond-shaped part is hollow, and air holes are formed in the side of the hollow sealing ring. Preferably, through holes are formed in the surfaces of the first socket welding flange and the second socket welding flange, bolts are inserted into the through holes, and nuts are installed on the surface threads of the bolts. Preferably, the surface of the bolt is sleeved with first gaskets, and the number of the first gaskets corresponds to the number of the bolts and the nuts. Preferably, the surface of the bolt is sleeved with a second gasket, and the second gasket is positioned between the first socket welding flange and the second socket welding flange. Preferably, the inner diameter and the outer diameter of the circular ring are equal to those of the circular groove. Preferably, the loading parts of the hollow sealing rings are symmetrically arranged. Compared with the prior art, the utility model has the beneficial effects that: This flange structure for chemical industry pipeline that leakproofness is good, through the setting of ring, its external diameter and internal diameter all equal with the circular slot, thereby the circular ring gets into the circular slot inside and can carry out the shutoff, thereby be favorable to avoiding chemical industry liquid direct contact to V type packing ring, V type position of V type packing ring is located between trapezoidal ring and the trapezoidal ring groove, flat ring position is located between ring and the circular slot, consequently, V type packing ring is better in ordinary flat ring sealed effect, the leakproofness can be guaranteed through compressing tightly V type packing ring to trapezoidal ring, through the setting of hollow seal, its loading part is favorable to packing into the ring inslot, and the inside of diamond is because cavity, thereby the diamond receives the extrusion and can carry out fore-and-aft deformation, air in the cavity position is discharged through the gas pocket, thereby the cavity position can be closed, thereby be favorable to further improving socket joint welding flange one and socket joint welding flange two sealed effect. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used for the description of the embodiments will be briefly described below, and it i