Three-jaw sealing mechanism

Abstract

The utility model discloses a three-jaw sealing mechanism which can reduce the operation difficulty when a worker seals a through hole in a pipe joint flange of a transformer oil tank. The three-jaw sealing mechanism comprises a clamping jaw piece, a pressing nail (6) and a pressing disc (2). The clamping jaw piece comprises a nut (4) and three clamping jaws. The nut (4) is arranged on the pressing nail (6) in a sleeved mode, and the pressing nail (6) is in threaded connection with the nut (4). The pressure plate (2) is arranged in an area defined by the three clamping jaws; and the first end of the pressing nail (6) is rotationally connected with the pressing disc (2). When the pressing nail (6) rotates relative to the nut (4), the first end of the pressing nail (6) drives the pressing disc (2) to move in the direction close to the pipe joint flange (10) and then is pressed on the pipe joint flange (10), so that a through hole in the pipe joint flange (10) is sealed through the pressing disc (2).

Description

Technical Field

[0001] The utility model specifically relates to a three-claw sealing mechanism. Background Art

[0002] With the rapid development of the entire power industry, the production of the transformer industry tends to be standardized and highly reliable. Under the condition of ensuring high-quality production, it is also necessary to effectively improve production efficiency, that is, to deepen the degree of production standardization.

[0003] During the welding process of the transformer oil tank, some defects will occur, such as pores, cracks, lack of fusion, slag inclusions, etc. The existence of these defects will not only affect the mechanical properties of the weld seam, but also the through-hole defects will cause leakage of the weld seam. For oil-immersed transformers, the transformer oil inside the oil tank is used as the medium for heat conduction. For the safe operation of the transformer, leakage is not allowed to exist. Therefore, the non-destructive testing of the transformer oil tank is an essential link.

[0004] In the air pressure leak test preparation link of the oil tank production process, first of all, the whole oil tank needs to be sealed. The existing technology usually uses a mask and a rubber ring for sealing, and seals each flange opening in the form of multiple bolts tightened, which is complex in operation and consumes a lot of manpower and working hours. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a three-claw sealing mechanism aiming at the above deficiencies existing in the prior art, which can reduce the operation difficulty when workers seal the through holes on the pipe joint flange of the transformer oil tank.

[0006] In a first aspect, an embodiment of the utility model provides a three-claw sealing mechanism for a pipe joint flange of a transformer oil tank. The three-claw sealing mechanism includes a claw member, a pressing nail and a pressing plate. The claw member includes a nut and three claws, and the three claws are fixedly arranged around the outside of the nut; the pipe joint flange can enter the area surrounded by the three claws through the gap between two of the claws, and the pipe joint flange can be hooked by the claw heads of the three claws. The nut is sleeved on the pressing nail, and the pressing nail is in threaded connection with the nut. The pressing plate is arranged in the area surrounded by the three claws; the first end of the pressing nail is rotatably connected with the pressing plate. When the pressing nail rotates relative to the nut, the first end of the pressing nail drives the pressing plate to move towards the pipe joint flange and then presses tightly on the pipe joint flange, so as to seal the through holes on the pipe joint flange through the pressing plate.

[0007] Thus, the three-jaw sealing mechanism provided by the embodiment of the present utility model can enable the pipe joint flange to enter the area enclosed by the three jaws through the gap between two of the jaws by setting the jaw member and making the jaw member include a nut and three jaws, and the pipe joint flange can be hooked by the jaw heads of the three jaws. By setting the pressing nail and the pressing plate, and making the pressing nail threadedly connected with the nut, and the first end of the pressing nail rotatably connected with the pressing plate, when the pressing nail is rotated, the first end of the pressing nail can drive the pressing plate to rise or fall, so that the pressing plate is pressed against the pipe joint flange to seal the through hole on the pipe joint flange, or separated from the pipe joint flange, facilitating the disassembly of the three-jaw sealing mechanism. Therefore, the three-jaw sealing mechanism provided by the embodiment of the present utility model can reduce the operation difficulty of the worker when sealing the through hole on the pipe joint flange, is beneficial to reducing the labor intensity of the worker, thereby saving working hours and shortening the detection cycle of the product.

[0008] In some embodiments, the three jaws include a first jaw and two second jaws, and the length of the first jaw in the longitudinal direction is less than the length of the second jaw in the longitudinal direction. The included angle between the first jaw and any one of the second jaws is less than the included angle between the two second jaws.

[0009] In some embodiments, the three jaws include a first jaw and two second jaws, and the length of the first jaw in the longitudinal direction is less than the length of the second jaw in the longitudinal direction. The included angle between the first jaw and any one of the second jaws is 120°, and the included angle between the two second jaws is 120°.

[0010] In some embodiments, the top shape of the pipe joint flange is circular, and the minimum distance between the inner sides of the two second jaws is greater than the diameter of the top of the pipe joint flange; or, the top shape of the pipe joint flange is rectangular, and the minimum distance between the inner sides of the two second jaws is greater than the length of the short side of the top of the pipe joint flange.

[0011] In some embodiments, the through hole of the pipe joint flange is located at the central position of the top of the pipe joint flange. The top shape of the pipe joint flange is circular, and the distance between the inner side of the first jaw and the axis of the pressing nail is equal to the radius of the top of the pipe joint flange; or, the top shape of the pipe joint flange is rectangular, and the distance between the inner side of the first jaw and the axis of the pressing nail is equal to the distance between the center of the top of the pipe joint flange and the short side of the top of the pipe joint flange.

[0012] In some embodiments, a sealing groove is provided on the side surface of the pressing plate facing the pipe joint flange, and a sealing member is provided in the sealing groove.

[0013] In some embodiments, the sealing groove is annular, and the seal is correspondingly annular, with its center located on the axis of the pressing nail.

[0014] In some embodiments, an adhesive is provided between the seal and the sealing groove.

[0015] In some embodiments, a clamping plate is provided on the side of the pressure plate facing the pressing nail, and a clamping groove is formed between the clamping plate and the pressure plate. A pressing plate is fixed to the first end of the pressing nail, and the pressing plate is disposed in the clamping groove and can rotate relative to the pressure plate within the clamping groove.

[0016] In some embodiments, a handle is fixed to the second end of the pressing nail. Description of the Drawings

[0017] Figure 1 : A side view of a three-jaw sealing mechanism provided by an embodiment of the present invention;

[0018] Figure 2 : A top view of a three-jaw sealing mechanism provided by an embodiment of the present invention. Detailed Description of the Embodiments

[0019] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0020] Embodiment 1:

[0021] As Figure 1 and Figure 2 shown, an embodiment of the present invention provides a three-jaw sealing mechanism for the pipe joint flange 10 of a transformer oil tank, which can seal the through hole on the pipe joint flange 10 to facilitate leak detection of the transformer oil tank. The three-jaw sealing mechanism includes a jaw member, a pressing nail 6, and a pressure plate 2.

[0022] As Figure 1 and Figure 2 shown, the jaw member includes a nut 4 and three jaws, and the three jaws are circumferentially fixed outside the nut 4; the pipe joint flange 10 can enter the area surrounded by the three jaws through the gap between two of the jaws, and the through holes on the pipe joint flange 10 can be hooked by the jaw heads of the three jaws.

[0023] Exemplarily, the nut 4 and the three jaws can be an integral structure or a split structure.

[0024] In the case where the nut 4 and the three jaws are of a split structure, the three jaws are fixed outside the nut 4 by welding.

[0025] As Figure 2As shown, it can be understood that there are gaps between any two of the three jaws. By reasonably setting the gap between two of the jaws, the pipe joint flange 10 can enter the area enclosed by the three jaws through this gap. Combining Figure 1 , then the jaws of the three jaws can hook the pipe joint flange 10 to fix the jaw member on the pipe joint flange 10 in the vertical direction.

[0026] Combining Figure 1 and Figure 2 , the nut 4 is sleeved on the pressing nail 6, and the pressing nail 6 is threadedly connected to the nut 4. The pressing plate 2 is arranged in the area enclosed by the three jaws; the first end of the pressing nail 6 is rotatably connected to the pressing plate 2. When the pressing nail 6 rotates relative to the nut 4, the first end of the pressing nail 6 drives the pressing plate 2 to move towards the pipe joint flange 10 and then presses tightly on the pipe joint flange 10 to seal the through hole on the pipe joint flange 10 through the pressing plate 2.

[0027] Figure 1 In , when the pressing nail 6 rotates clockwise or counterclockwise, the pressing nail 6 can rise or fall relative to the nut 4 and drive the pressing plate 2, which is rotatably connected to its first end, to rise or fall.

[0028] Exemplarily, when it is necessary to seal the through hole on the pipe joint flange 10, the pressing nail 6 can be rotated clockwise to make the pressing nail 6 descend, so as to drive the pressing plate 2 to descend and cover the through hole on the pipe joint flange 10 to seal the through hole on the pipe joint flange 10. At this time, the transformer oil tank can be leak-tested. After the detection is completed, the pressing nail 6 can be rotated counterclockwise to make the pressing nail 6 rise, so as to drive the pressing plate 2 to rise and separate the pressing plate 2 from the pipe joint flange 10, facilitating the removal of the three-jaw sealing mechanism from the pipe joint flange 10.

[0029] Therefore, when operating the three-jaw sealing mechanism, only by rotating the pressing nail 6 can the three-jaw sealing mechanism seal and separate from the pipe joint flange 10, reducing the operation difficulty of the three-jaw sealing mechanism, being beneficial to reducing the labor intensity of workers, thus saving working hours and shortening the detection cycle of the product.

[0030] Moreover, compared with the blind plate, rubber ring and multiple bolts used in the prior art, the three-jaw sealing mechanism in this embodiment also has the advantage of simple structure, thus being convenient for manufacturing.

[0031] Therefore, the three-jaw sealing mechanism provided by the embodiment of the present utility model can enable the pipe joint flange 10 to enter the area enclosed by the three jaws through the gap between two of the jaws by setting the jaw member and making the jaw member include a nut 4 and three jaws, and hook the pipe joint flange 10 through the jaw heads of the three jaws. By setting the pressing nail 6 and the pressing plate 2 and making the pressing nail 6 threadedly connected to the nut 4 and the first end of the pressing nail 6 rotatably connected to the pressing plate 2, when the pressing nail 6 is rotated, the first end of the pressing nail 6 can drive the pressing plate 2 to rise or fall, so that the pressing plate 2 is pressed against the pipe joint flange 10 to seal the through hole on the pipe joint flange 10, or separated from the pipe joint flange 10 to facilitate the disassembly of the three-jaw sealing mechanism. Therefore, the three-jaw sealing mechanism provided by the embodiment of the present utility model can reduce the operation difficulty when workers seal the through hole on the pipe joint flange 10, is beneficial to reducing the labor intensity of workers, thereby saving working hours and shortening the inspection and production cycle of the product.

[0032] In some embodiments, as Figure 2 shown, the above three jaws include a first jaw 1 and two second jaws 8, and the length of the first jaw 1 in the longitudinal direction is less than the length of the second jaw 8 in the longitudinal direction. The included angle between the first jaw 1 and any one of the second jaws 8 is less than the included angle between the two second jaws 8.

[0033] The included angles between the first jaw 1 and the two second jaws 8 respectively can be equal or not equal.

[0034] For example, the included angles between the first jaw 1 and the two second jaws 8 respectively can be 100° and 110°, and at this time the included angle between the two second jaws 8 is 150°.

[0035] Or, the included angles between the first jaw 1 and the two second jaws 8 respectively can be 110° and 110°, and at this time the included angle between the two second jaws 8 is 140°.

[0036] As Figure 2 shown, it can be understood that the included angle between the two second jaws 8 is larger, and the lengths of the two second jaws 8 in the longitudinal direction are longer. Therefore, the gap between the two second jaws 8 is larger, and at this time the pipe joint flange 10 can enter the area enclosed by the three jaws through the gap between the two second jaws 8.

[0037] In other embodiments, as Figure 2 shown, the included angle between the first jaw 1 and any one of the second jaws 8 is 120°, and the included angle between the two second jaws 8 is 120°.

[0038] That is to say, the three jaws are evenly distributed on the outside of the nut 4.

[0039] It can be understood that at this time, the gap between the two second claws 8 is still relatively large, and the pipe joint flange 10 can enter the area enclosed by the three claws through the gap between the two second claws 8.

[0040] At this time, the three claws are evenly distributed on the outer side of the nut 4. When the claw heads of the three claws hook the pipe joint flange 10 and drive the pressing plate 2 through the pressing nail 6 to seal the through hole of the pipe joint flange 10, the forces on the three claws of the three-claw sealing mechanism can be balanced to maintain the stability of the position of the three-claw sealing mechanism and the pipe joint flange 10.

[0041] In some embodiments, the top shape of the pipe joint flange 10 is circular, and the minimum distance between the inner sides of the two second claws 8 is greater than the diameter of the top of the pipe joint flange 10.

[0042] Through the above settings, the top of the pipe joint flange 10 can completely enter the area enclosed by the three claws through the gap between the inner sides of the two second claws 8.

[0043] In some other examples, the top shape of the pipe joint flange 10 is rectangular, and the minimum distance between the inner sides of the two second claws 8 is greater than the length of the short side of the top of the pipe joint flange 10.

[0044] Through the above settings, the top of the pipe joint flange 10 can enter the area enclosed by the three claws from its short side completely through the gap between the inner sides of the two second claws 8.

[0045] In some embodiments, the through hole of the pipe joint flange 10 is located at the central position of the top of the pipe joint flange 10. The top shape of the pipe joint flange 10 is circular, and the distance between the inner side of the first claw 1 and the axis of the pressing nail 6 is equal to the radius of the top of the pipe joint flange 10.

[0046] Through the above settings, combined with Figure 1 and Figure 2 , when the edge of the top of the pipe joint flange 10 abuts against the inner side of the first claw 1, the center of the top of the pipe joint flange 10 and the center of the pressing nail 6 can be on the same straight line, so as to rely on the cooperation of the three claws to complete the positioning of the top of the pipe joint flange 10 in the radial direction, and make the acting force of the pressing nail 6 on the pressing plate 2 be evenly applied to the pipe joint flange 10.

[0047] In some other examples, the top shape of the pipe joint flange 10 is rectangular, and the distance between the inner side of the first claw 1 and the axis of the pressing nail 6 is equal to the distance between the center of the pipe joint flange 10 and the short side of the top of the pipe joint flange 10.

[0048] As described above, the top of the pipe joint flange 10 enters the area enclosed by the three claws completely through the gap between the inner sides of the two second claws 8 from its short side. At this time, the short side of the top of the pipe joint flange 10 ( Figure 2 the left side in

[0049] ) abuts against the inner side of the first claw 1. Figure 1 and Figure 2 , when the short side of the top of the pipe joint flange 10 ( Figure 2 the left side in

[0050] ) abuts against the inner side of the first claw 1, it can also make the center of the top of the pipe joint flange 10 and the center of the pressing nail 6 on the same straight line. Thus, relying on the cooperation of the three claws to complete the positioning of the top of the pipe joint flange 10 in the radial direction, so that the acting force of the pressing nail 6 on the pressing disc 2 can be evenly applied to the pipe joint flange 10. Figure 1 In some embodiments, as

[0051] shown, a sealing groove is provided on the side of the pressing disc 2 facing the pipe joint flange 10, and a sealing member 9 is arranged in the sealing groove.

[0052] Exemplarily, the size of the sealing member 9 is larger than the size of the through hole on the pipe joint flange 10. When the pressing disc 2 seals the through hole on the pipe joint flange 10, the sealing member 9 surrounds the outside of the through hole on the pipe joint flange 10.

[0053] Exemplarily, the material of the sealing member 9 can be a flexible material such as rubber.

[0054] The sealing groove can position the sealing member 9 to avoid unnecessary displacement of the sealing member 9, and the sealing member 9 can improve the sealing effect between the pressing disc 2 and the pipe joint flange 10.

[0055] In some embodiments, the sealing groove is annular, and the sealing member 9 is a corresponding annular shape, and its center is located on the axis of the pressing nail 6.

[0056] When the sealing member 9 is provided, the pressure applied by the pressing nail 6 on the pressing disc 2 is conducted to the pipe joint flange 10 through the sealing member 9.

[0057] Through the above settings, the forces at each position on the sealing member 9 can be made equal, and the resultant force of the final force applied to the pipe joint flange 10 is located on the axis of the pressing nail 6, which is beneficial to maintaining the stability of the position of the pressing nail 6 and the pipe joint flange 10.

[0058] In some embodiments, an adhesive is provided between the sealing member 9 and the sealing groove.

[0059] With the above settings, it is possible to prevent the seal 9 from falling off the pressure plate 2.

[0060] In some embodiments, as Figure 1 shown, a clamping plate 3 is provided on the side of the pressure plate 2 facing the pressure nail 6, and a clamping groove is formed between the clamping plate 3 and the pressure plate 2. A pressing plate 7 is fixed to the first end of the pressure nail 6, and the pressing plate 7 is arranged in the clamping groove, and the pressing plate 7 can rotate relative to the pressure plate 2 in the clamping groove.

[0061] Exemplarily, the clamping plate 3 is fixed to the side of the pressure plate 2 facing the pressure nail 6 by welding.

[0062] Exemplarily, through holes are formed in the clamping plate 3, and the first end of the pressure nail 6 passes through the through holes and then extends into the clamping groove to be fixedly connected with the pressing plate 7.

[0063] As Figure 1 shown, with the above settings, when the pressure nail 6 rotates, it drives the pressing plate 7 to rotate relative to the pressure plate 2 in the clamping groove, so that the pressure plate 2 can remain stationary relative to the pipe joint flange 10, facilitating the application of the vertical force of the pressure nail 6 on the pipe joint flange 10 through the pressure plate 2. Moreover, when the pressure nail 6 moves away from the pipe joint flange 10, the clamping plate 3 can drive the pressure plate 2 to move away from the pipe joint flange 10, so that the pressure plate 2 is separated from the pipe joint flange 10.

[0064] In some embodiments, as Figure 1 and Figure 2 shown, a handle 5 is fixed to the second end of the pressure nail 6.

[0065] Exemplarily, the handle 5 is fixed to the second end of the pressure nail 6 by welding.

[0066] With the above settings, workers can conveniently rotate the pressure nail 6 through the handle 5, reducing the operation difficulty of the three-jaw sealing mechanism.

[0067] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, and the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A three-jaw sealing mechanism for the pipe joint flange (10) of a transformer oil tank, characterized in that, The three-jaw sealing mechanism includes: A jaw member, including a nut (4) and three jaws, and the three jaws are fixedly arranged around the outer side of the nut (4); the pipe joint flange (10) can enter the area surrounded by the three jaws through the gap between two of the jaws, and the pipe joint flange (10) can be hooked by the jaw heads of the three jaws. A pressing nail (6), the nut (4) is sleeved on the pressing nail (6), and the pressing nail (6) is threadedly connected with the nut (4); and A pressing disc (2), arranged in the area surrounded by the three jaws; the first end of the pressing nail (6) is rotatably connected with the pressing disc (2). When the pressing nail (6) rotates relative to the nut (4), the first end of the pressing nail (6) drives the pressing disc (2) to move towards the pipe joint flange (10) and then press tightly on the pipe joint flange (10), so as to seal the through hole on the pipe joint flange (10) through the pressing disc (2).

2. The three-jaw sealing mechanism according to claim 1, wherein The three jaws include a first jaw (1) and two second jaws (8), and the length of the first jaw (1) in the longitudinal direction is less than the length of the second jaw (8) in the longitudinal direction. The included angle between the first jaw (1) and any one of the second jaws (8) is less than the included angle between the two second jaws (8).

3. The three-jaw sealing mechanism according to claim 1, characterized in that, The three jaws include a first jaw (1) and two second jaws (8), and the length of the first jaw (1) in the longitudinal direction is less than the length of the second jaw (8) in the longitudinal direction. The included angle between the first jaw (1) and any one of the second jaws (8) is 120°, and the included angle between the two second jaws (8) is 120°.

4. The three-jaw sealing mechanism according to claim 3, wherein The top of the pipe joint flange (10) is circular, and the minimum distance between the inner sides of the two second jaws (8) is greater than the diameter of the top of the pipe joint flange (10); or The top of the pipe joint flange (10) is rectangular, and the minimum distance between the inner sides of the two second jaws (8) is greater than the length of the short side of the top of the pipe joint flange (10).

5. The three-jaw sealing mechanism according to claim 4, characterized in that, The through hole of the pipe joint flange (10) is located at the center of the top of the pipe joint flange (10); The top of the pipe joint flange (10) is circular, and the distance between the inner side of the first jaw (1) and the axis of the pressing nail (6) is equal to the radius of the top of the pipe joint flange (10); or The top of the pipe joint flange (10) is rectangular, and the distance between the inner side of the first jaw (1) and the axis of the pressing nail (6) is equal to the distance between the center of the top of the pipe joint flange (10) and the short side of the top of the pipe joint flange (10).

6. The three-jaw sealing mechanism according to claim 1, wherein, A sealing groove is arranged on the side surface of the pressing disc (2) facing the pipe joint flange (10), and a sealing member (9) is arranged in the sealing groove.

7. The three-jaw sealing mechanism according to claim 6, characterized in that, The sealing groove is circular-ring-shaped, and the seal (9) is correspondingly circular-ring-shaped with its center located on the axis of the press stud (6).

8. The three-jaw sealing mechanism according to claim 6, characterized in that, An adhesive is provided between the seal (9) and the sealing groove.

9. The three-jaw sealing mechanism according to any one of claims 1-8, characterized in that, A clamping plate (3) is provided on one side of the pressure plate (2) facing the press stud (6), and a clamping groove is formed between the clamping plate (3) and the pressure plate (2); A pressing plate (7) is fixed to the first end of the press stud (6), the pressing plate (7) is arranged in the clamping groove, and the pressing plate (7) can rotate relative to the pressure plate (2) within the clamping groove.

10. The three-jaw sealing mechanism according to any one of claims 1-8, characterized in that, A handle (5) is fixed to the second end of the press stud (6).

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