Flat welding flange with high sealing performance

Abstract

The high-sealing-performance flat welding flange comprises flange plates which are oppositely arranged, and positioning nuts are arranged on the outer sides of the flange plates in a penetrating and screwed mode; layers of annular sealing rings which are sleeved at intervals are accommodated on the sides, close to each other, of the flange plates; clamping structures in threaded connection with the flange plates on the two sides are arranged at the positions, corresponding to gaps of the sealing rings, of the flange plates, the clamping structures penetrate through and abut against the flange plate on one side and are in threaded connection with the flange plate on the other side, and the abutting ends of the clamping structures extend outwards; a sealing film sealing structure is arranged between the extending end of the clamping structure and the outer side of the flange plate; the end, close to the film sealing structure, of the clamping structure is provided with a screwing auxiliary structure capable of rotating in one direction. The sealing structure has the effects that more pressure is obtained at the position of the sealing ring, and the sealing performance is improved.

Description

Technical Field

[0001] The present application relates to the field of flange technology, and in particular to a high-sealing flat-weld flange. Background Art

[0002] Flange, also known as flange flange or flange, is a part that connects shafts to each other. It is used for connecting pipe ends. It is also used as flange on equipment inlet and outlet. It is used for connecting two equipments. The sealing surface types include flat surface and raised surface. It is easy to obtain materials, simple to manufacture and low in cost.

[0003] The existing Chinese patent with announcement number CN220152105U discloses a high-airtightness plate-type flat-welded flange, including a first flange and a second flange. The right end surface of the first flange is evenly provided with a plurality of tightening mechanisms for simultaneously tightening a plurality of bolts. The first flange surface is provided with a first connecting hole at a position inside the tightening mechanism, and the first connecting hole passes through the first flange surface; the second flange surface is evenly provided with a plurality of second connecting holes, and the second connecting holes pass through the second flange surface; bolts are provided inside the tightening mechanism, and the bolts are clearance-matched with the first connecting holes and the second connecting holes; the left end surface of the second flange is fixedly connected with a fixing ring at the position of the second connecting hole, and a nut is clamped and fitted inside the fixing ring, and the nut is threadedly fitted with the bolt; the first flange and the second flange surfaces are respectively provided with a first sealing gasket and a second sealing gasket at the contact positions between each other.

[0004] In order to improve the sealing performance of the above-mentioned flange, although multiple sealing gaskets and multiple sets of tightening structures are used, since the screwing structure is close to the outside and the sealing ring is close to the inside, the two positions are radially offset, and the entire pressure of the tightening structure cannot be applied to the sealing ring, resulting in low sealing efficiency. In response to the above-mentioned related technologies, the applicant has proposed a flat welding flange that can provide more pressure to the sealing ring and improve the sealing performance. Utility Model Content

[0005] In order to obtain more pressure at the sealing ring and improve the sealing performance, the present application provides a high-sealing flat welding flange.

[0006] The high-tightness flat welding flange provided in this application adopts the following technical solution:

[0007] A high-sealing flat welding flange comprises relatively arranged flanges, with positioning nuts passing through and screwed on the outer sides of the flanges; a sealing ring with annular spacing is accommodated on one side of the flanges; a clamping structure screwed to the flanges on both sides is provided at the gap between the flanges and the sealing rings, the clamping structure passes through and abuts against the flange on one side, and is screwed to the flange on the other side, and the abutting end of the clamping structure extends outward; a sealing film sealing structure is provided between the extended end of the clamping structure and the outer side of the flange; an auxiliary structure that can be screwed and rotated in one direction is provided at one end of the clamping structure close to the sealing film sealing structure.

[0008] By adopting the above technical solution, more clamping structures can be evenly distributed on the disk surface of the flange, thereby improving the overall clamping degree of the flange and avoiding positioning and clamping only by the outer positioning nut. At the same time, the outer side of the clamping structure is sealed by a sealing film sealing structure to prevent leakage, and the installation is facilitated by the screw-connected auxiliary structure.

[0009] Preferably, the clamping structure includes an abutment bolt, a threaded groove and a screw opening, the abutment bolt is passed through and accommodated in one side of the flange, and abuts against the side of the two flanges away from each other; the threaded groove is opened on one side of the opposite flange, and the threaded groove is located in the gap between adjacent sealing rings, and the abutment bolt is screwed to the threaded groove; the screw opening is opened in the flange on the abutment side of the abutment bolt, extends and is connected to the outside of the flange.

[0010] Preferably, the sealing membrane sealing structure includes an elastic sealing membrane and a diaphragm support plate; the elastic sealing membrane is fixed and sealed in the threaded opening, and the abutting bolts are accommodated in the elastic sealing membrane; the diaphragm support plate is threaded on the outside of the flange and arranged corresponding to the threaded opening; the elastic sealing membrane abuts against the diaphragm support plate.

[0011] By adopting the above technical solution, the elastic sealing diaphragm can not only seal the abutment bolts, but also utilize the elasticity of the diaphragm to adapt to the tightening of the abutment bolts, so that the abutment bolts can be tightened while having a strong sealing effect, and the slope support plate provides support for the elastic sealing membrane to resist negative pressure and prevent rupture.

[0012] Preferably, the screw-connection auxiliary structure includes an inner ring ratchet, a first screw-connection column, an outer ring ratchet and a second screw-connection column, the inner ring ratchet is unidirectionally connected to the abutment end of the abutment bolt; the first screw-connection column is fixed to the inner ring ratchet; the outer ring ratchet is sleeved on the inner ring ratchet and unidirectionally connected to the abutment bolt, and the rotation directions of the inner ring ratchet and the outer ring ratchet are opposite; the second screw-connection column is fixed to the outer ring ratchet, and the second screw-connection column is staggered with the first screw-connection column.

[0013] By adopting the above technical solution, the abutment bolts are easy to disassemble and assemble. During the rotation process, they can be tightened or loosened by multiple times at a small angle, so that the elastic sealing membrane does not need to bear excessive lateral torque, preventing the elastic sealing membrane from rupture and damage, while facilitating installation.

[0014] Preferably, a leakage detection structure is provided between the outermost sealing ring and the second outermost sealing ring, and the leakage detection structure includes a pressure diaphragm, a deformation cavity and an indicator rod; the deformation cavity is opened on the inner side of a flange on one side, and the deformation cavity extends outward; the pressure diaphragm is fixed to the inner side of the flange and arranged corresponding to the deformation cavity, and the pressure diaphragm is elastic; the indicator rod is fixed to the pressure diaphragm and extends toward one side of the deformation cavity, and the indicator rod is penetrated and slidably connected to the flange.

[0015] Preferably, the inner circle of the abutment bolts and the adjacent outer circle of the abutment bolts are respectively arranged offset with respect to the axis connecting the flange.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. The clamping structure includes an abutment bolt, a threaded groove and a screw connection opening. The abutment bolt is passed through and accommodated in one side of the flange and abuts against the side of the two flanges that are away from each other. The threaded groove is opened on one side of the opposite flange and is located in the gap between the adjacent sealing rings. The abutment bolt is screwed to the threaded groove. The screw connection opening is opened on the flange on the abutment side of the abutment bolt and extends and communicates with the outside of the flange.

[0018] 2. While the elastic sealing diaphragm seals the abutment bolts, it can also adapt to the tightening of the abutment bolts by utilizing the elasticity of the diaphragm, so that the abutment bolts can be tightened while having a strong sealing effect, and the slope support plate provides support for the elastic sealing diaphragm to resist negative pressure and prevent rupture;

[0019] 3. The abutment bolts are easy to disassemble and assemble. During the rotation process, you can use a small angle multiple times to tighten or loosen the bolts, so that the elastic sealing membrane does not need to bear excessive lateral torque, preventing the elastic sealing membrane from rupture and damage, while facilitating installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0021] Figure 2 It is a partial cross-sectional view showing the inner side of the flange of this application;

[0022] Figure 3 yes Figure 2 Magnified view of part A.

[0023] Explanation of the accompanying drawings: 1. Flange; 2. Positioning nut; 3. Sealing ring; 4. Clamping structure; 41. Abutment bolt; 42. Threaded groove; 43. Screwed opening; 5. Membrane sealing structure; 51. Elastic sealing membrane; 52. Diaphragm support plate; 6. Screwed auxiliary structure; 61. Inner ring ratchet; 62. First screwed column; 63. Outer ring ratchet; 64. Second screwed column; 7. Leakage detection structure; 71. Pressure diaphragm; 72. Deformation cavity; 73. Indicator rod;. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings.

[0025] The present application discloses a high-seal flat welding flange, referring to Figure 1 , 2, including relatively arranged flanges 1, with positioning nuts 2 arranged at intervals and screwed on the outer sides of the flanges 1; a sealing ring 3 with annular intervals is accommodated on the adjacent side of the flanges 1; a clamping structure 4 screwed on the flanges 1 on both sides is provided at the gap between the flanges 1 corresponding to the sealing ring 3; the clamping structure 4 increases the clamping force between the two flanges 1 near the positioning nuts 2.

[0026] Reference Figure 2 , 3 The clamping structure 4 includes an abutment bolt 41, a threaded groove 42 and a screw opening 43. The abutment bolt 41 is passed through and accommodated in one side of the flange 1, and abuts against the side of the two flanges 1 that are away from each other. The inner circle of the abutment bolt 41 and the adjacent outer circle abutment bolt 41 are respectively staggered with the axis connecting line of the flange 1, so that the clamping force is more uniform; the threaded groove 42 is opened on one side of the opposite flange 1, and the threaded groove 42 is located in the gap between the adjacent sealing rings 3, and the abutment bolt 41 is screwed to the threaded groove 42; the screw opening 43 is opened on the flange 1 on the abutment side of the abutment bolt 41, extends and is connected to the outside of the flange 1; when the abutment screw is rotated, the abutment screw clamps the flanges 1 on both sides, thereby enhancing the abutment force at the sealing ring 3.

[0027] Reference Figure 2 , 3 A sealing membrane sealing structure 5 for sealing the abutment bolt 41 is provided at the threaded opening 43, and the sealing membrane sealing structure 5 includes an elastic sealing membrane 51 and a diaphragm supporting plate 52; the elastic sealing membrane 51 is fixed and sealingly connected in the threaded opening 43, and the abutment bolt 41 is accommodated in the elastic sealing membrane 51; the diaphragm supporting plate 52 is threadedly connected to the outer side of the flange 1 and is arranged corresponding to the threaded opening 43; the elastic sealing membrane 51 abuts against the diaphragm supporting plate 52.

[0028] Reference Figure 2 , 3 The abutment bolt 41 is provided with a screw connection auxiliary structure 6 for assisting tightening without damaging the elastic sealing membrane 51. The screw connection auxiliary structure 6 includes an inner ring ratchet 61, a first screw connection column 62, an outer ring ratchet 63 and a second screw connection column 64. The inner ring ratchet 61 is unidirectionally connected to the abutment end of the abutment bolt 41; the first screw connection column 62 is fixed to the inner ring ratchet 61; the outer ring ratchet 63 is sleeved on the inner ring ratchet 61 and unidirectionally connected to the abutment bolt 41, and the inner ring ratchet 61 rotates in opposite directions to the outer ring ratchet 63; the second screw connection column 64 is fixed to the outer ring ratchet 63, and the second screw connection column 64 is staggered with the first screw connection column 62;

[0029] Reference Figure 2 , 3 When the abutment bolt 41 needs to be tightened or loosened, the tool is sleeved on the first screw column 62 or the second screw column 64 through the elastic sealing film 51, and the inner ring ratchet 61 or the outer ring ratchet 63 drives the abutment bolt 41 intermittently by reciprocating the tool.

[0030] Reference Figure 2 A leakage detection structure 7 is provided between the outermost layer of the sealing ring 3 and the second outermost layer of the sealing ring 3, and the leakage detection structure 7 includes a pressure diaphragm 71, a deformation cavity 72 and an indicator rod 73; the deformation cavity 72 is opened on the inner side of the flange 1 on one side, and the deformation cavity 72 extends outward; the pressure diaphragm 71 is fixed to the inner side of the flange 1 and is arranged corresponding to the deformation cavity 72, and the pressure diaphragm 71 is elastic; the indicator rod 73 is fixed to the pressure diaphragm 71 and extends toward the deformation cavity 72, and the indicator rod 73 is penetrated and slidably connected to the flange 1; when the inner sealing ring 3 leaks and flows to the outer sealing ring 3, the oil fills the elastic diaphragm, the pressure diaphragm 71 is deformed toward the deformation cavity 72, and the indicator rod 73 is penetrated out of the flange 1, which can conveniently prompt the leakage of the inner sealing ring 3.

[0031] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-sealing flat welding flange, comprising flange plates (1) arranged opposite to each other, characterized in that: A positioning nut (2) is passed through and screwed on the outer side of the flange (1); a sealing ring (3) is arranged in an annular spacer on one side of the flange (1); a clamping structure (4) is screwed on the flanges (1) on both sides at a gap corresponding to the sealing ring (3); the clamping structure (4) is passed through and abuts on one side of the flange (1) and screwed on the other side of the flange (1), and the abutting end of the clamping structure (4) extends outward; a sealing film sealing structure (5) is provided between the extended end of the clamping structure (4) and the outer side of the flange (1); and an auxiliary structure (6) that can be screwed and rotated in one direction is provided on the clamping structure (4) at one end close to the sealing film sealing structure (5).

2. The high-sealing flat welding flange according to claim 1 is characterized in that: The clamping structure (4) comprises an abutment bolt (41), a threaded groove (42) and a screw-connected opening (43); the abutment bolt (41) is passed through and accommodated in one side of the flange (1), and abuts against the side of the two flanges (1) that are away from each other; the threaded groove (42) is opened on one side of the opposite flange (1), and the threaded groove (42) is located in the gap between the adjacent sealing rings (3), and the abutment bolt (41) is screw-connected to the threaded groove (42); the screw-connected opening (43) is opened on the flange (1) on the abutment side of the abutment bolt (41), and extends to and is connected to the outside of the flange (1).

3. The high-sealing flat welding flange according to claim 2 is characterized in that: The sealing membrane sealing structure (5) comprises an elastic sealing membrane (51) and a membrane support plate (52); the elastic sealing membrane (51) is fixed and sealed in the threaded opening (43), and the abutment bolt (41) is accommodated in the elastic sealing membrane (51); the membrane support plate (52) is threaded on the outside of the flange (1) and is arranged corresponding to the threaded opening (43); the elastic sealing membrane (51) abuts against the membrane support plate (52).

4. The high-tightness flat welding flange according to claim 2 is characterized in that: The screw connection auxiliary structure (6) includes an inner ring ratchet (61), a first screw connection column (62), an outer ring ratchet (63) and a second screw connection column (64), wherein the inner ring ratchet (61) is unidirectionally connected to the abutting end of the abutting bolt (41); the first screw connection column (62) is fixed to the inner ring ratchet (61); the outer ring ratchet (63) is sleeved on the inner ring ratchet (61) and unidirectionally connected to the abutting bolt (41), and the inner ring ratchet (61) and the outer ring ratchet (63) rotate in opposite directions; the second screw connection column (64) is fixed to the outer ring ratchet (63), and the second screw connection column (64) and the first screw connection column (62) are staggered.

5. The high-sealing flat welding flange according to claim 2 is characterized in that: A leakage detection structure (7) is provided between the outermost layer of the sealing ring (3) and the second outermost layer of the sealing ring (3), and the leakage detection structure (7) comprises a pressure diaphragm (71), a deformation cavity (72) and an indicator rod (73); the deformation cavity (72) is opened on the inner side of a flange (1) on one side, and the deformation cavity (72) extends outward; the pressure diaphragm (71) is fixed on the inner side of the flange (1) and is arranged corresponding to the deformation cavity (72), and the pressure diaphragm (71) is elastic; the indicator rod (73) is fixed on the pressure diaphragm (71) and extends toward one side of the deformation cavity (72), and the indicator rod (73) is penetrated and slidably connected to the flange (1).

6. The high-sealing flat welding flange according to claim 2 is characterized in that: The inner ring of the abutment bolts (41) and the adjacent outer ring of the abutment bolts (41) are respectively arranged offset with respect to the axis connecting line of the flange (1).

Images