Local pressure testing device for pressure vessel

Abstract

The utility model discloses a local pressure testing device for a pressure vessel, which belongs to the field of pressure vessel pressure testing and comprises a sealing blind plate and a flange cover, the flange cover can be connected with a flange on a pressure vessel connecting pipe through a bolt, a through hole is arranged in the center of the flange cover, a pull rod is arranged in the through hole, and one end of the pull rod is connected with the center of the sealing blind plate. One side, close to the inner wall of the sealing head, of the peripheral end of the sealing blind plate is provided with a matching surface, the matching surface is internally tangent to the inner wall of the sealing head at the abutting position of the matching surface, the matching surface is provided with a sealing groove, a sealing ring is arranged in the sealing groove, and one side, close to the center of the sealing blind plate, of the matching surface is provided with a sealing ring; and / or one side, far away from the center of the sealing blind plate, of the matching surface is provided with an anti-interference inclined surface for preventing interference with the inner wall of the sealing head, the structure can realize local pressure test of the welding seam position between the connecting pipe and the shell sealing head, and the required sealing blind plate can be suitable for sealing heads with different curvatures at the contact position with the shell.

Description

Technical Field

[0001] The utility model relates to the field of pressure testing of pressure vessels, in particular to a local pressure testing device for pressure vessels. Background Art

[0002] Pressure vessel is a special equipment. It is a closed container, which is composed of cylinder, head, pipe and other components, and contains material medium. During the use of the container, there is a certain pressure inside, and its function is to achieve material storage, separation, reaction, or heat exchange.

[0003] Container components are usually made of metal materials, and components are usually connected by welding, such as the connection between the pipe and the head. After the container is manufactured, it needs to be pressure tested to test the overall strength of the equipment and the sealing of the weld.

[0004] The test method is to fill the test medium inside, raise it to a certain pressure, then maintain the pressure, and inspect the weld under a certain pressure. If a weld leak is found during the pressure test, the leaking weld position needs to be repaired by welding. After the repair, the pressure test needs to be repeated until it is qualified.

[0005] For large containers, it is troublesome to conduct pressure tests. If it is a water pressure test, the weight after filling with water is very large, which is a test of the bearing capacity of the water source and the foundation, and requires a lot of support; if it is a gas pressure test, due to the compressibility of gas, the process of filling gas is time-consuming, and the gas pressure test is more dangerous. Its danger increases with the increase of test pressure and volume. Once the container explodes, the gas will release a large shock wave, causing casualties and huge property losses. The test requires a large safety distance, and other operations cannot be carried out nearby at the same time.

[0006] In practice, there is often such a situation that a leak is found in the weld connecting a pipe orifice and the head during the test, and a pressure test needs to be carried out again after repair. The usual practice in the industry is to fill the entire container with medium again and carry out the test, which is time-consuming and laborious. However, since it is a local welding repair, in fact, only a local pressure test can be carried out on the repaired weld. However, there is currently a lack of such equipment to meet the above-mentioned local pressure test.

[0007] In view of the above problems, the utility model designs and manufactures a local pressure testing device for a pressure vessel to overcome the above defects. Utility Model Content

[0008] In order to solve the problems existing in the prior art, the utility model provides a local pressure testing device for a pressure vessel, which can realize the local pressure testing of the weld position between the connecting pipe and the shell head, and the required sealing blind plate can be suitable for heads with different curvatures at the contact position with the shell.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a local pressure test device for a pressure vessel, comprising a sealing blind plate and a flange cover, wherein the flange cover can be connected to the flange on the pressure vessel pipe by bolts, a through hole is provided at the center of the flange cover, a tie rod is provided in the through hole, one end of the tie rod is connected to the center of the sealing blind plate, and the other end of the tie rod is provided with a thread, the end of the tie rod provided with a thread extends from the pipe through the through hole and is screwed with a nut, and the rotation of the nut can drive the sealing blind plate to abut against the inner wall of the head through the tie rod;

[0010] A mating surface is provided at one side of the peripheral end of the sealing blind plate close to the inner wall of the head, the mating surface is inscribed in the inner wall of the head at the abutment position of the mating surface, a sealing groove is provided on the mating surface, a sealing ring is provided in the sealing groove, and the sealing ring can abut on the inner wall of the head to achieve sealing of the space between the flange cover and the sealing blind plate;

[0011] The side of the mating surface close to the center of the sealing blind plate, and / or the side of the mating surface away from the center of the sealing blind plate is provided with an anti-interference inclined surface to prevent interference with the inner wall of the head.

[0012] Preferably, a sealing ring groove is provided in the through hole, an O-ring is provided in the sealing ring groove, and the pull rod is sealingly connected to the O-ring;

[0013] And / or, a sealing gasket is provided between the flange of the connecting pipe and the flange cover.

[0014] Preferably, the flange cover is provided with a water injection interface, a venting interface, a pressure gauge interface and a drain interface.

[0015] Preferably, the pull rod is integrally provided with the sealing blind plate, or the pull rod is screwed onto the sealing blind plate.

[0016] Preferably, the sealing blind plate is a flat plate, and an angle is provided between the end surface of the flat plate close to the flange cover and the mating surface;

[0017] The anti-interference slope is arranged on a side of the matching surface away from the center of the sealing blind plate.

[0018] Preferably, the angle between the end surface of the plate and the matching surface is set to 155°-165°, and the angle between the end surface of the plate and the anti-interference inclined surface is set to 140°-150°.

[0019] Preferably, the sealing blind plate is configured as a flange plate, the flange of the flange plate faces the inner wall of the head, the end of the flange is provided with a mating surface, the mating surface is close to the center of the sealing blind plate and the mating surface is away from the center of the sealing blind plate. Anti-interference inclined surfaces are provided, and an angle is provided between the two anti-interference inclined surfaces and the mating surface.

[0020] Preferably, the anti-interference inclined surface close to the center of the sealing blind plate is parallel to the plate surface of the sealing blind plate.

[0021] Preferably, the plate surface of the flange plate facing the connecting pipe direction is set to a concave spherical surface or a convex spherical surface.

[0022] Preferably, the angle between the anti-interference inclined surface on the side close to the center of the sealing blind plate and the matching surface is set to 155°-165°, and the angle between the two anti-interference inclined surfaces is set to 140°-150°.

[0023] The utility model is beneficial in that:

[0024] 1. The utility model arranges corresponding anti-interference inclined surfaces at the periphery of the mating surface, so that the sealing blind plate has a certain applicability to heads with different curvatures, and can improve the versatility of the sealing blind plate.

[0025] 2. A flange structure is provided on the sealing blind plate, which can strengthen the sealing blind plate and increase the volume of the pressure test medium, thus better ensuring the pressure test effect.

[0026] 3. The surface of the sealing blind plate is set as a concave or convex spherical surface, which can improve the stress of the sealing blind plate, reduce the thickness of the material, reduce the weight, and facilitate assembly.

[0027] 4. The utility model realizes the local pressure test when the welding seam between the connecting pipe and the head is repaired, which saves the waste of water resources caused by the overall water pressure test, reduces the requirements for support and foundation due to the overall water pressure, saves the time consumption caused by the overall filling with water or air, saves the working hours and consumables of sealing each pipe mouth of the container due to the overall water pressure, reduces the risk of explosion caused by the overall water pressure and air pressure, and avoids the disadvantage of large-area rust on the inner wall of the container due to the overall water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a local pressure test device for a pressure vessel in use;

[0029] Figure 2 It is a partial schematic diagram of the first embodiment of the utility model when in use;

[0030] Figure 3 This is a schematic diagram of A in Embodiment 1 of the present utility model;

[0031] Figure 4 This is a schematic diagram of the B portion of the first embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the C portion of the first embodiment of the present utility model;

[0033] Figure 6 This is the front view of the flange cover of the utility model;

[0034] Figure 7 This is a partial schematic diagram of the second embodiment of the utility model when in use;

[0035] Figure 8 This is a schematic diagram of D in Embodiment 2 of the present utility model;

[0036] Fig. 9 This is a partial schematic diagram of the third embodiment of the utility model when the sealing blind plate is used as a convex spherical surface;

[0037] Fig.10 This is a partial schematic diagram of the sealing blind plate of the third embodiment of the utility model when it is used as a concave spherical surface.

[0038] In the figure: 1-head, 2-flange cover, 3-pull rod, 4-sealing blind plate, 5-manhole, 6-pipe, 7-nut, 21-sealing ring groove, 22-O-ring, 23-sealing gasket, 24-pressure gauge interface, 25-vent interface, 26-water injection interface, 27-drain interface, 41-matching surface, 42-sealing groove, 43-sealing ring, 44-anti-interference inclined surface, 45-flange. DETAILED DESCRIPTION

[0039] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0040] like Figures 1 to 10 As shown, a local pressure test device for a pressure vessel includes a sealing blind plate 4 and a flange cover 2. The flange cover 2 can be connected to the flange on the pressure vessel pipe 6 by bolts. Specifically, a plurality of connection holes are arranged at the edge of the flange cover 2. The positions and numbers of the connection holes are consistent with the connection holes of the flange on the pipe 6. The flange cover 2 is fixed to the flange of the pipe 6 by fasteners. Furthermore, a sealing gasket 23 is preferably arranged between the flange of the pipe 6 and the flange cover 2 to improve the sealing performance.

[0041] A through hole is provided at the center of the flange cover 2, in which a pull rod 3 is provided. The diameter of the through hole is slightly larger than the outer diameter of the pull rod 3. A sealing ring groove 21 is provided in the through hole, in which an O-ring 22 is provided. The pull rod 3 can be sealed and connected with the O-ring 22. After the pressure is increased, the O-ring 22 is deformed under the action of pressure and is tightly squeezed on the sealing surface to achieve pressure sealing and meet the required pressure test requirements.

[0042] One end of the tie rod 3 of the utility model is connected to the center of the sealing blind plate 4, and the other end of the tie rod 3 is provided with a thread. The end of the tie rod 3 provided with a thread extends from the pipe 6 through a through hole and is screwed with a nut 7. The rotation of the nut 7 can drive the sealing blind plate 4 to abut against the inner wall of the head 1 through the tie rod 3. A spring washer is preferably arranged between the nut 7 and the flange cover 2. The spring washer is mainly used to prevent the nut 7 from loosening and improve the reliability and tightness of the connection.

[0043] The pull rod 3 and the sealing blind plate 4 can be arranged integrally, or the pull rod 3 can be screwed onto the sealing blind plate 4. The latter method allows the pull rod 3 to be replaced. When facing pipes 6 of different lengths, the applicable requirements can be continued to be met by replacing the pull rod 3 of the corresponding length.

[0044] During the specific test, the sealing blind plate 4 and / or the tie rod 3 can enter the interior of the pressure vessel through the larger manhole 5 of the pressure vessel.

[0045] The utility model provides a mating surface 41 at the peripheral end of the sealing blind plate 4 close to the inner wall of the head 1, the mating surface 41 is inscribed in the inner wall of the head 1 at the abutment position of the mating surface 41, a sealing groove 42 is provided on the mating surface 41, a sealing ring 43 is provided in the sealing groove 42, and the sealing ring 43 can abut on the inner wall of the head 1 to achieve the sealing of the space between the flange cover 2 and the sealing blind plate 4. The mating surface 41 is close to the center of the sealing blind plate 4, and / or the mating surface 41 is far from the center of the sealing blind plate 4. The anti-interference inclined surface 44 for preventing interference with the inner wall of the head 1 is provided, so that the sealing blind plate 4 has a certain applicability to the heads 1 with different curvatures, and the versatility of the sealing blind plate 4 can be improved.

[0046] Finally, a local closed chamber is formed at the welding position of the connecting pipe 6 and the head 1 among the sealing blind plate 4, the head 1, the connecting pipe 6 and the flange cover 2. The flange cover 2 is provided with a water injection interface 26, a vent interface 25, a pressure gauge interface 24 and a drain interface 27. The test medium is injected into the local closed chamber from the water injection interface 26 and the pressure is increased. The vent interface 25 is arranged at the top of the flange cover 2 to facilitate gas exhaust. The pressure gauge interface 24 is connected to the pressure gauge. The drain interface 27 can facilitate the exhaust of the test medium. When the water injection interface 26, the vent interface 25 and the drain interface 27 need to be closed, they can be sealed with a screw plug.

[0047] Embodiment 1:

[0048] like Figures 1 to 6 As shown, the sealing blind plate 4 is configured as a flat plate, and an angle β is provided between the end surface of the flat plate close to the flange cover 2 and the mating surface 41 , and the anti-interference slope 44 is specifically provided on the side of the mating surface 41 away from the center of the sealing blind plate 4 .

[0049] The included angle β between the end surface of the plate and the mating surface 41 is preferably set to 155°-165°, and the included angle θ between the end surface of the plate and the anti-interference inclined surface 44 is preferably set to 140°-150°.

[0050] Embodiment 2:

[0051] like Figure 7 , Figure 8 As shown, the sealing blind plate 4 is configured as a flanged plate, and the flanged edge 45 of the flanged plate faces the inner wall of the head 1. The flanged edge 45 structure can strengthen the sealing blind plate 4 and increase the volume of the pressure test medium, thereby better ensuring the pressure test effect.

[0052] A mating surface 41 is provided at the end of the flange 45 . Anti-interference inclined surfaces 44 are provided on the side of the mating surface 41 close to the center of the sealing blind plate 4 and on the side of the mating surface 41 away from the center of the sealing blind plate 4 . An angle is provided between the two anti-interference inclined surfaces 44 and the mating surface 41 .

[0053] The included angle β between the anti-interference inclined surface 44 near the center of the sealing blind plate 4 and the mating surface 41 is set to 155°-165°, and the included angle θ between the two anti-interference inclined surfaces 44 is set to 140°-150°. The anti-interference inclined surface 44 near the center of the sealing blind plate 4 of the utility model is preferably parallel to the plate surface of the sealing blind plate 4.

[0054] Embodiment three:

[0055] The same contents as those in the second embodiment will not be described in detail. Fig. 9 , Fig.10 As shown, the plate surface of the flange plate facing the pipe 5 is set to a concave spherical surface or a convex spherical surface. Under the same pressure, the stress of the spherical surface is less than that of the flat plate. The above structure can improve the stress of the sealing blind plate 4, reduce the thickness of the material, reduce the weight, and facilitate assembly.

[0056] The above embodiments can realize the local pressure test when the weld connecting the connecting pipe 6 and the head 1 is repaired, which saves the waste of water resources caused by the overall water pressure test, reduces the requirements for support and foundation due to the overall water pressure, saves the time consumption caused by the overall filling with water or air, saves the working hours and consumables for sealing the pipe openings of the container due to the overall water pressure, reduces the risk of explosion caused by the overall water pressure and air pressure, and avoids the disadvantage of large-area rust on the inner wall of the container due to the overall water pressure.

[0057] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A pressure vessel local pressure test device, characterized in that: It comprises a sealing blind plate (4) and a flange cover (2), wherein the flange cover (2) can be connected to a flange on a pipe (6) of a pressure vessel by means of bolts, a through hole is provided at the center of the flange cover (2), a tie rod (3) is provided in the through hole, one end of the tie rod (3) is connected to the center of the sealing blind plate (4), the other end of the tie rod (3) is provided with a thread, the threaded end of the tie rod (3) extends from the pipe (6) through the through hole and is screwed with a nut (7), and the rotation of the nut (7) can drive the sealing blind plate (4) to abut against the inner wall of the head (1) through the tie rod (3); A mating surface (41) is provided on the side of the peripheral end of the sealing blind plate (4) close to the inner wall of the head (1), the mating surface (41) is inscribed in the inner wall of the head (1) at the abutment position of the mating surface (41), a sealing groove (42) is provided on the mating surface (41), a sealing ring (43) is provided in the sealing groove (42), and the sealing ring (43) can abut against the inner wall of the head (1) to achieve sealing of the space between the flange cover (2) and the sealing blind plate (4); The mating surface (41) is provided on one side close to the center of the sealing blind plate (4), and / or the mating surface (41) is provided on one side away from the center of the sealing blind plate (4) to prevent interference with the inner wall of the head (1).

2. A pressure vessel local pressure testing device according to claim 1, characterized in that: A sealing ring groove (21) is provided in the through hole, an O-ring (22) is provided in the sealing ring groove (21), and the pull rod (3) is sealedly connected to the O-ring (22); And / or, a sealing gasket (23) is provided between the flange of the connecting pipe (6) and the flange cover (2).

3. A pressure vessel local pressure testing device according to claim 1, characterized in that: The flange cover (2) is provided with a water injection interface (26), a venting interface (25), a pressure gauge interface (24) and a drain interface (27).

4. A pressure vessel local pressure testing device according to claim 1, characterized in that: The pull rod (3) is integrally arranged with the sealing blind plate (4), or the pull rod (3) is screwed onto the sealing blind plate (4).

5. A pressure vessel local pressure testing device according to claim 1, characterized in that: The sealing blind plate (4) is a flat plate, and an angle is provided between the end surface of the flat plate on the side close to the flange cover (2) and the mating surface (41); The anti-interference inclined surface (44) is arranged on a side of the matching surface (41) away from the center of the sealing blind plate (4).

6. A pressure vessel local pressure testing device according to claim 5, characterized in that: The included angle between the end surface of the plate and the matching surface (41) is set to 155°-165°, and the included angle between the end surface of the plate and the anti-interference inclined surface (44) is set to 140°-150°.

7. A pressure vessel local pressure testing device according to claim 1, characterized in that: The sealing blind plate (4) is configured as a flanged plate, the flange (45) of the flanged plate faces the inner wall of the head (1), a mating surface (41) is provided at the end of the flange (45), an anti-interference inclined surface (44) is provided on the side of the mating surface (41) close to the center of the sealing blind plate (4) and on the side of the mating surface (41) away from the center of the sealing blind plate (4), and an angle is provided between the two anti-interference inclined surfaces (44) and the mating surface (41).

8. A pressure vessel local pressure testing device according to claim 1, characterized in that: The anti-interference inclined surface (44) close to the center of the sealing blind plate (4) is parallel to the plate surface of the sealing blind plate (4).

9. A pressure vessel local pressure testing device according to claim 7, characterized in that: The plate surface of the flange plate facing the connecting pipe (6) is configured as a concave spherical surface or a convex spherical surface.

10. A pressure vessel local pressure testing device according to claim 7 or 9, characterized in that: The included angle between the anti-interference inclined surface (44) on the side close to the center of the sealing blind plate (4) and the matching surface (41) is set to 155°-165°, and the included angle between the two anti-interference inclined surfaces (44) is set to 140°-150°.

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