Welded type flowmeter shell water pressure testing device

Abstract

The invention provides a welded flowmeter shell water pressure testing device which comprises a pressure testing machine body, and a workbench is arranged on the surface of the pressure testing machine body. A protective door is arranged on the surface of a shell of the pressure testing machine body wrapping the workbench, the protective door is rotatably connected with the shell of the pressure testing machine body, and an observation window is arranged on the protective door; comprising plugging structures, the plugging structures are arranged on the two sides of a workbench, each plugging structure comprises two plug components which are symmetrically arranged, can achieve self-positioning and are detachable, and the two plug components are plugged at the ends of pipelines on the two sides of the flowmeter respectively; the plug part comprises a sealing assembly, and the sealing assembly comprises a first sealing part with a double-sealing function or a second sealing part with an active sealing function. A detachable sealing structure is adopted to replace a traditional welding plug, and tedious procedures such as welding, heat treatment after welding and plug cutting after testing are avoided.

Description

Technical Field

[0001] This invention relates to the field of flow meter quality inspection, specifically to a welded flow meter housing water pressure testing device. Background Technology

[0002] Welded flow meters have a fully welded structure, and leaks cannot be repaired by disassembling or replacing the seals (flanges). Therefore, a rigorous hydrostatic test must be conducted before leaving the factory to verify the strength and sealing of the housing and ensure that it can withstand the pressure under actual working conditions.

[0003] For the hydrostatic testing of the casing of welded flow meters, the traditional method usually involves the following cumbersome procedures:

[0004] (1) Welding before pressure test

[0005] Since welded flow meters typically do not have flange connections, plugs (blind plates) need to be welded to both ends of the housing during pressure testing to seal the internal space.

[0006] After welding, the weld quality needs to be checked to ensure that there will be no leakage during pressure testing.

[0007] (2) Post-weld heat treatment

[0008] Some materials (such as thick-walled structures of carbon steel or stainless steel) require heat treatment after welding to relieve welding stress and prevent deformation or cracking during pressure testing.

[0009] (3) Cutting the plug after pressure testing

[0010] After the test is completed, the plug needs to be sawed or machined to remove it so that it can be installed into the pipeline later.

[0011] This step not only increases processing time but may also lead to additional material waste.

[0012] Meanwhile, since the pipes on both sides of the welded flow meter are connected to the pipe to be measured by welding, most of the pipe ports on the welded flow meter adopt a bevel design. This may result in the port and the sealing ring not fitting completely, reducing the reliability of the sealing structure formed between the removable seal and the sealing ring.

[0013] Therefore, a welded flow meter housing hydrostatic testing device is provided to address the above-mentioned problems. Summary of the Invention

[0014] In order to solve the problems of cumbersome procedures in traditional test devices and the fact that most pipe ports on welded flow meters adopt a bevel design, which may result in the port and the sealing ring not being able to fit completely, thus reducing the reliability of the sealing structure formed between the removable seal and the sealing ring, this invention provides a hydraulic pressure testing device for welded flow meter housings.

[0015] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0016] This invention provides a welded flow meter housing water pressure testing device, including a testing machine body, the surface of which is provided with a workbench; a protective door is provided on the surface of the testing machine body housing which is wrapped around the workbench, the protective door is rotatably connected to the housing of the testing machine body, and an observation window is provided on the protective door;

[0017] The device includes a sealing structure, which is disposed on both sides of the workbench. The sealing structure includes two symmetrically arranged, self-positioning, and detachable plug components, which are respectively plugged on the ends of the pipes on both sides of the flow meter.

[0018] The plug component includes a sealing assembly, which includes a first sealing part with a dual sealing function or a second sealing part with an active sealing function.

[0019] In this technical solution, the sealing assembly further includes a driving part, which is connected to the bearing shaft. The bearing shaft is provided with a first sealing part or a second sealing part, and the driving part drives the first sealing part or the second sealing part on the bearing shaft to move in the horizontal direction.

[0020] The end of the bearing shaft is provided with a positioning component that can extend into the flow meter pipe.

[0021] The two drive units drive the first or second sealing part to move toward the pipes on both sides of the flow meter via corresponding bearing shafts, thereby blocking the pipes on both sides of the flow meter, and then inject liquid into the flow meter to conduct a water pressure test.

[0022] The drive unit includes a mounting bracket, which is fixed to one side of the worktable, and a drive component is fixed on the mounting bracket. The drive component is connected to the bearing shaft via a drive rod and drives the first sealing part or the second sealing part on the bearing shaft to move in the horizontal direction.

[0023] The driving component is preferably an electrically or hydraulically driven telescopic rod, such as an electric actuator or a hydraulic rod.

[0024] The drive component extends or shortens, thereby causing the support plate and the first or second sealing part on the support plate to move in the horizontal direction.

[0025] The positioning component includes multiple positioning rods that are rotatably connected to the end of the bearing shaft, and the positioning rods are distributed in a ring array on the end of the bearing shaft.

[0026] A torsion spring is provided at the connection between the positioning rod and the end of the bearing shaft, and the torsion spring causes the positioning rod to be tilted away from the flow meter.

[0027] The positioning rod protrudes to the side away from the bearing axis, forming an arc-shaped structure.

[0028] The sealing assembly further includes a support plate, which is sleeved and fixed on the support shaft, and the support plate is provided with a first sealing part or a second sealing part;

[0029] The support plate is connected to an external pipe for connecting an external pump body.

[0030] The first or second sealing part on the bearing plate seals the end of the pipe.

[0031] The first sealing part includes a ring-shaped skeleton, which is fixed on the support plate. The surface of the skeleton is provided with a ring-shaped mounting groove. A first sealing ring, which is also ring-shaped, is fixed inside the mounting groove. The surface of the first sealing ring that contacts the annular end face of the flow meter pipe is the first sealing surface.

[0032] The outer edge of the first sealing ring protrudes outward to form a ring-shaped sealing ring, and a transmission component is provided on one side of the sealing ring to push it to wrap around the bevel surface of the flow meter pipe end or end.

[0033] As the support plate containing the first sealing part moves toward the flow meter pipeline under the drive of the drive unit, the first sealing surface on the first sealing ring is pressed against the annular surface of the pipeline port to form a seal.

[0034] The transmission assembly is mounted on a telescopic drive rod, and a spring is sleeved on the drive rod. The drive rod is composed of two rods that slide and sleeve each other, and the two ends of the spring are respectively fixed to the two rods.

[0035] The transmission assembly includes a mounting ring, which is sleeved and fixed on the end of the drive rod away from the support plate. Multiple transmission rods are fixed on the annular surface of the mounting ring in a circular array. The connecting rods at the ends of the transmission rods pass through the support plate and are connected to the moving ring.

[0036] The movable ring is fitted around the periphery of the sealing ring, and a trigger ring is fixedly fitted around the periphery of the sealing ring. The outer wall of the trigger ring extends outward to form a trumpet-shaped structure.

[0037] The trigger ring contacts the moving ring, and the sealing ring has multiple reserved through grooves to facilitate the sealing ring to be fitted onto the bevel surface at the end of the flow meter pipe or the end. The reserved through grooves occupy only half or less of the width of the trigger ring.

[0038] This solves the problem that traditional sealing methods (such as simple rubber expansion seals or rigid seals) have limited contact area between the sealing ring and the pipe port during pressure testing, which can easily lead to insufficient local sealing and leakage during the test.

[0039] Especially under high-pressure testing, due to the shape of the pipe or the bevel angle, the sealing ring may not be able to completely fit the pipe end, reducing the reliability of the seal.

[0040] The second sealing part includes a second sealing ring. The supporting plate has a circular structure, and an annular cavity is formed on the annular end face of the edge of the supporting plate. The second sealing ring is sleeved and fixed on the annular cavity.

[0041] The outer edge of the second sealing ring protrudes outward to form a swingable annular sealing end. The top surface of the sealing end forms an annular second sealing surface. The cross-section of the second sealing surface is an inclined surface or a circular arc surface that is inclined in the direction away from the flow meter pipe.

[0042] A lifting part is provided on the side of the sealing end away from the flow meter pipeline, and the outer diameter of the annular sealing end that does not swing is interference-fitted with the inner diameter of the pipeline.

[0043] The connection between the annular sealing end and the second sealing ring has two symmetrically arranged annular pre-folded grooves on both sides, which are recessed inward to facilitate the swinging of the sealing end.

[0044] The lifting part is located on the side of the sealing end away from the flow meter pipe.

[0045] The annular pre-folded groove facilitates the swinging of the annular sealing end, and the cross-section of the annular sealing end is circular.

[0046] The lifting part includes a bearing ring, which is fixed on a bearing plate. A drive bladder with an annular structure is fixed on the bearing ring. The drive bladder is located inside the corresponding pre-folding groove and is externally connected to an air pump or hydraulic pump.

[0047] By filling the drive bladder with a medium using an air pump or hydraulic pump, the annular drive bladder is supported by the medium, thereby pushing the sealing end outward and making it fit more closely to the inner wall of the pipeline.

[0048] After the driving bladder is expanded by the medium, its surface does not deform or undergoes only slight deformation.

[0049] The bearing shaft, bearing plate, second sealing ring, bearing ring and drive bladder are all concentrically arranged. The drive bladder is an air bladder structure, and an inert gas medium or liquid medium is pumped into it.

[0050] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0051] This invention proposes a detachable sealing structure for hydrostatic testing of welded flowmeter housings, based on traditional testing equipment. Compared to the traditional method of welding plugs and cutting, the testing device of this invention has the following significant advantages:

[0052] 1. Convenient and quick, improving testing efficiency.

[0053] The removable sealing structure replaces the traditional welded plug, avoiding cumbersome processes such as welding, post-weld heat treatment, and plug cutting after testing.

[0054] The test preparation time is shortened, which greatly improves the working efficiency of the flow meter water pressure test and is suitable for large-scale production line testing.

[0055] 2. Reusable, reducing costs.

[0056] Traditional welded plugs need to be cut and scrapped after each test, resulting in material waste and additional labor costs.

[0057] The sealing structure of this invention can be reused multiple times, reducing material consumption, lowering testing costs, and conforming to the concept of green manufacturing.

[0058] 3. By using a first sealing part with dual sealing function, the problem of leakage during the test is solved by the limited contact area between the sealing ring and the pipe port in traditional sealing methods (such as simple rubber expansion seals or rigid seals). This can easily lead to insufficient local sealing.

[0059] Especially under high pressure testing, the sealing ring may not be able to fully fit the pipe end due to the shape of the pipe or the bevel angle, thus reducing the reliability of the seal. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the overall external structure of the present invention;

[0061] Figure 2 This is a schematic diagram of the overall structure of the protective door after it has been concealed.

[0062] Figure 3 This is a schematic diagram showing the positional relationship between the sealing structure and the flow meter of the present invention;

[0063] Figure 4 This is a schematic diagram of the pressure test structure of the flange-type flow meter of the present invention after it is connected to the pipeline to be tested;

[0064] Figure 5 This is a three-dimensional structural diagram of the plug component of the present invention;

[0065] Figure 6 This is a top view of the plug component of the present invention;

[0066] Figure 7 For the present invention Figure 6 A schematic diagram of the cross-sectional structure at BB;

[0067] Figure 8 For the present invention Figure 6 A three-dimensional structural diagram showing the cross-section at point BB;

[0068] Figure 9 For the present invention Figure 7 A magnified schematic diagram of the structure at point I;

[0069] Figure 10 This is a three-dimensional structural diagram of the first sealing ring of the present invention;

[0070] Figure 11 This is a schematic diagram of the planar structure of the first sealing ring of the present invention;

[0071] Figure 12 For the present invention Figure 11 A cross-sectional three-dimensional structural diagram at the CC point;

[0072] Figure 13 This is a schematic diagram of the structure of the second sealing part of the present invention;

[0073] Figure 14 This is a top view of the second sealing part of the present invention;

[0074] Figure 15 For the present invention Figure 14 A three-dimensional structural diagram showing the cross-section at DD;

[0075] Figure 16 For the present invention Figure 15 A magnified schematic diagram of the structure at point J;

[0076] Figure 17 For the present invention Figure 14 A three-dimensional structural diagram showing the cross-section at DD.

[0077] Explanation of reference numerals in the attached figures

[0078] 1. Pressure testing machine body; 2. Protective door; 3. Workbench; 4. Drive assembly; 41. Mounting bracket; 42. Drive component; 43. Drive rod; 5. Bearing shaft; 6. Sealing assembly; 61. Bearing plate; 611. External pipe; 62. First sealing part; 621. Skeleton; 622. First sealing ring; 6221. Sealing ring; 6221b. First sealing surface; 6222. Reserved through groove; 623. Trigger ring; 63. Second sealing part; 631. Annular cavity; 632. Second sealing ring; 633. Sealing end; 6331. Second sealing surface; 634. Pre-folded groove; 635. Bearing ring; 636. Drive bladder; 7. Transmission assembly; 71. Mounting ring; 72. Transmission rod; 73. Connecting rod; 74. Moving ring; 8. Positioning assembly; 81. Positioning rod; a. Flow meter. Detailed Implementation

[0079] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0080] like Figure 1 and Figure 2 As shown, the welded flow meter housing water pressure testing device includes a testing machine body 1, on the surface of which a workbench 3 is provided; a protective door 2 is provided on the surface of the housing of the testing machine body 1 that is wrapped around the workbench 3, and the protective door 2 is rotatably connected to the housing of the testing machine body 1, and an observation window is provided on the protective door 2.

[0081] The system includes a sealing structure, which is set on both sides of the workbench 3. The sealing structure includes two symmetrically arranged, self-positioning and detachable plug components. The two plug components are respectively plugged on the ends of the pipes on both sides of the flow meter a, and the plugs are connected to external water pumps.

[0082] The plug component includes a sealing assembly 6, which includes a first sealing part 62 with a dual sealing function or a second sealing part 63 with an active sealing function.

[0083] The welded flow meter a is sealed on both sides by a detachable sealing structure to facilitate water pressure testing of the flow meter a housing. This is convenient and quick, and the reusable sealing structure also saves resources and reduces the cost of the test.

[0084] Specifically, such as Figure 5 As shown, the sealing assembly 6 also includes a driving part, which is connected to the bearing shaft 5. The bearing shaft 5 is provided with a first sealing part 62 or a second sealing part 63. The driving part drives the first sealing part 62 or the second sealing part 63 on the bearing shaft 5 to move in the horizontal direction.

[0085] The end of the bearing shaft 5 is provided with a positioning component 8 that can extend into the pipe of flow meter a.

[0086] The two drive parts drive the first sealing part 62 or the second sealing part 63 to move toward the pipes on both sides of the flow meter a through the corresponding bearing shaft 5, thereby blocking the pipes on both sides of the flow meter a, and then injecting liquid into it to conduct a water pressure test.

[0087] The drive unit includes a mounting bracket 41, which is fixed to one side of the workbench 3. A drive component 42 is fixed on the mounting bracket 41. The drive component 42 is connected to the bearing shaft 5 via a drive rod 43 and drives the first sealing part 62 or the second sealing part 63 on the bearing shaft 5 to move in the horizontal direction.

[0088] The drive element 42 is preferably an electrically or hydraulically driven telescopic rod, such as an electric actuator or a hydraulic rod.

[0089] The drive member 42 extends or shortens, thereby causing the support plate 61 and the first sealing part 62 or the second sealing part 63 on the support plate 61 to move in the horizontal direction.

[0090] The positioning component 8 includes a plurality of positioning rods 81 that are rotatably connected to the end of the bearing shaft 5, and the positioning rods 81 are distributed in a ring array on the end of the bearing shaft 5.

[0091] A torsion spring is provided at the connection between the positioning rod 81 and the end of the bearing shaft 5. The torsion spring causes the positioning rod 81 to be tilted toward the side away from the flow meter a.

[0092] The positioning rod 81 protrudes to the side away from the bearing shaft 5 to form an arc-shaped structure.

[0093] When the two drive parts drive the corresponding bearing shaft 5 to move towards both sides of the flow meter a, the positioning component 8 located at the end of the bearing shaft 5 enters the pipe of the flow meter a first. The positioning rod 81 on the positioning component 8 rotates after being squeezed by the port of the pipe. At this time, the torsion spring deforms, and the positioning component 8 continues to move into the pipe until it is completely inside the pipe.

[0094] At this point, the rebound force of the torsion spring causes the positioning rod 81 on the bearing shaft 5 to be supported in the inner cavity of the pipe, so that the center line of the bearing shaft 5 coincides with the center line of the pipe, thus completing the positioning and facilitating the subsequent sealing assembly 6 to seal the port of the pipe.

[0095] The sealing assembly 6 also includes a support plate 61, which is sleeved and fixed on the support shaft 5. The support plate 61 is provided with a first sealing part 62 or a second sealing part 63.

[0096] An external pipe 611 for connecting an external pump body is connected to the support plate 61.

[0097] The first sealing part 62 or the second sealing part 63 on the bearing plate 61 seals the end of the pipe.

[0098] The first sealing part 62 includes a ring-shaped skeleton 621, which is fixed on the support plate 61. The surface of the skeleton 621 is provided with a ring-shaped mounting groove. A first sealing ring 622, which is also a ring-shaped structure, is fixed inside the mounting groove. The surface of the first sealing ring 622 that contacts the annular end face of the flow meter a pipe is the first sealing surface 6221b.

[0099] The outer edge of the first sealing ring 622 protrudes outward to form a sealing ring 6221 with an annular structure. A transmission component 7 is provided on one side of the sealing ring 6221, which can push it to wrap around the bevel surface of the end of the flow meter a pipe or the end of the pipe.

[0100] As the support plate 61, where the first sealing part 62 is located, moves toward the flow meter a pipe under the drive of the drive unit, the first sealing surface 6221b on the first sealing ring 622 is pressed against the annular surface of the pipe port to form a seal.

[0101] The transmission assembly 7 is mounted on the telescopic drive rod 43, and a spring is sleeved on the drive rod 43. The drive rod 43 is composed of two rods that slide and sleeve each other, and the two ends of the spring are respectively fixed on the two rods.

[0102] like Figure 7 and 9 As shown, the transmission assembly 7 includes a mounting ring 71, which is sleeved and fixed on the end of the drive rod 43 away from the bearing plate 61. A plurality of transmission rods 72 are fixed on the annular surface of the mounting ring 71 in an annular array. The connecting rods 73 at the ends of the transmission rods 72 pass through the bearing plate 61 and are connected to the moving ring 74.

[0103] The movable ring 74 is fitted around the sealing ring 6221, and a trigger ring 623 is fitted and fixed around the sealing ring 6221. The outer wall of the trigger ring 623 extends outward to form a trumpet-shaped structure.

[0104] The trigger ring 623 contacts the moving ring 74. The sealing ring 6221 has multiple reserved through grooves 6222, which facilitates the sealing ring 6221 to be fitted onto the end of the flow meter a pipe or the bevel surface on the end. The reserved through grooves 6222 occupy only half or less of the width of the trigger ring 623.

[0105] When the drive unit pushes the bearing plate 61 to move via the drive rod 43, the telescopic drive rod 43 does not deform when the first sealing surface 6221b is not in contact with the pipe. When the first sealing surface 6221b contacts the end of the pipe, the drive unit continues to extend, and the rod connected to the drive unit continues to slide on another rod. At this time, the drive rod 43 retracts, and the spring deforms.

[0106] The transmission rod 72, connected to the corresponding rod, drives the connecting rod 73 to move. The moving ring 74, connected to the connecting rod 73, moves synchronously. The moving ring 74 moves on the trumpet-shaped trigger ring 623. Because the surface of the trigger ring 623 has a slope, the moving ring 74 squeezes the trigger ring 623 inward during the movement, thereby causing the sealing ring 6221 to shrink and wrap around the pipe end or bevel, so as to increase the effective sealing contact area between the first sealing part 62 and the pipe port and improve the sealing effect.

[0107] This solves the problem that traditional sealing methods (such as simple rubber expansion seals or rigid seals) have limited contact area between the sealing ring and the pipe port during pressure testing, which can easily lead to insufficient local sealing and leakage during the test.

[0108] Especially under high pressure testing, the sealing ring may not be able to fully fit the pipe end due to the shape of the pipe or the bevel angle, thus reducing the reliability of the seal.

[0109] Specifically, such as Figure 13-17 As shown, the second sealing part 63 includes a second sealing ring 632, the bearing plate 61 has a circular structure, and an annular cavity 631 is formed on the annular end face of the edge of the bearing plate 61. The second sealing ring 632 is sleeved and fixed on the annular cavity 631.

[0110] The outer edge of the second sealing ring 632 protrudes outward to form a swingable annular sealing end 633. The top surface of the sealing end 633 forms an annular second sealing surface 6331. The cross-section of the second sealing surface 6331 is an inclined surface or arc surface that is inclined towards the side of the pipe away from the flow meter a.

[0111] A lifting part is provided on the side of the sealing end 633 away from the flow meter a pipe. The outer diameter of the annular sealing end 633, which does not swing, is interference fit with the inner diameter of the pipe.

[0112] The bearing plate 61 drives the second sealing part 63 on its surface into the corresponding pipe. The sealing end 633 on the second sealing ring 632 is squeezed by the pipe end and the inner wall of the pipe. After entering the pipe, the sealing end 633 swings away from the pipe. The second sealing surface 6331 on the sealing end 633 adheres to the inner wall of the pipe. Then, the lifting part pushes the second sealing ring 632 back, making it adhere more closely to the inner wall of the pipe, thus forming an active strong sealing structure.

[0113] With the sealing element being removable, the second sealing part 63 can effectively achieve the sealing function.

[0114] The connection between the annular sealing end 633 and the second sealing ring 632 is recessed on both sides to form two symmetrically arranged annular pre-folding grooves 634, so as to allow the sealing end 633 to swing.

[0115] The lifting part is located on the side of the sealing end 633 away from the flow meter a pipe.

[0116] The annular pre-folding groove 634 facilitates the swinging of the annular sealing end 633, and the cross-section of the annular sealing end 633 is circular.

[0117] The lifting part includes a support ring 635, which is fixed on the support plate 61. A drive bladder 636 with an annular structure is fixed on the support ring 635. The drive bladder 636 is located inside the corresponding pre-folding groove 634 and is externally connected to an air pump or hydraulic pump.

[0118] The medium is injected into the drive bladder 636 by an air pump or hydraulic pump, so that the annular drive bladder 636 is supported by the medium, thereby pushing the sealing end 633 outward and making it fit more closely to the inner wall of the pipeline.

[0119] After the drive bladder 636 is expanded by the medium, its surface does not deform or undergoes only a small amount of deformation.

[0120] The bearing shaft 5, bearing plate 61, second sealing ring 632, bearing ring 635 and drive bladder 636 are all concentrically arranged. The drive bladder 636 is an air bladder structure, and an inert gas medium or liquid medium is pumped into it.

[0121] Figure 13-17 The positioning components and other parts connected to the bearing shaft 635 are not shown.

[0122] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A welding flowmeter housing water pressure testing device, comprising a pressure testing body (1), the surface of the pressure testing body (1) is provided with a workbench (3); the surface of the pressure testing body (1) shell wrapped in the workbench (3) is provided with a protective door, the protective door is rotatably connected with the shell of the pressure testing body (1), and an observation window is arranged on the protective door, characterized in that: it comprises a plugging structure, the plugging structure is arranged on both sides of the workbench (3), the plugging structure comprises two symmetrically arranged and self-positioning and detachable plug components, and the two plug components are respectively plugged on the end portions of the pipelines on both sides of the flowmeter (a); the plug component comprises a sealing assembly (6), and the sealing assembly (6) comprises a first sealing part (62) having a double sealing function or a second sealing part (63) having an active sealing function. The sealing assembly (6) further comprises a driving part connected with a bearing shaft (5), the bearing shaft (5) is provided with a first sealing part (62) or a second sealing part (63), and the driving part drives the first sealing part (62) or the second sealing part (63) on the bearing shaft (5) to move in the horizontal direction.

2. The welded flowmeter housing hydrostatic pressurization apparatus of claim 1, wherein: The end portion of the bearing shaft (5) is provided with a positioning assembly (8) which can extend into the pipeline inside the flowmeter (a). The driving part comprises a mounting bracket (41) fixed on one side of the workbench (3), and a driving piece (42) is fixed on the mounting bracket (41), the driving piece (42) is connected with the bearing shaft (5) through a driving rod (43) and drives the first sealing part (62) or the second sealing part (63) on the bearing shaft (5) to move in the horizontal direction.

3. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 2, wherein: The positioning assembly (8) comprises a plurality of positioning rods (81) rotatably connected with the end portion of the bearing shaft (5), and the positioning rods (81) are distributed in the form of an annular array on the end portion of the bearing shaft (5); 4. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 2, wherein: The connecting portion of the positioning rod (81) and the end portion of the bearing shaft (5) is provided with a torsional spring, and the torsional spring makes the positioning rod (81) tilt away from the flowmeter (a). The sealing assembly (6) further comprises a bearing plate (61) which is sleeved and fixed on the bearing shaft (5), and the bearing plate (61) is provided with a first sealing part (62) or a second sealing part (63); 5. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 2, wherein: The bearing plate (61) is connected with an external pipe (611) for connecting an external pump body. The first sealing part (62) comprises a skeleton (621) of an annular structure, the skeleton (621) is fixed on the bearing plate (61), and an installation groove of an annular structure is formed in the surface of the skeleton (621), a first sealing ring (622) of an annular structure is fixed in the installation groove, and a first sealing surface (6221b) is formed on the surface of the first sealing ring (622) which is in contact with the annular end face of the pipeline of the flowmeter (a); 6. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 5, wherein: The outer edge of the first sealing ring (622) is outwardly protruded to form an annular plugging ring (6221), and a transmission assembly (7) which can push the plugging ring (6221) to wrap around the bevel surface of the end portion or the end portion of the pipeline of the flowmeter (a) is arranged on one side of the plugging ring (6221). ​ 7. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 6, wherein: The transmission assembly (7) is mounted on the telescopic drive rod (43), and a spring is sleeved on the drive rod (43); The transmission assembly (7) includes a mounting ring (71), which is sleeved and fixed on the end of the drive rod (43) away from the bearing plate (61). Multiple transmission rods (72) arranged in a ring array are fixed on the annular surface of the mounting ring (71). The connecting rod (73) at the end of the transmission rod (72) passes through the bearing plate (61) and is connected to the moving ring (74). The movable ring (74) is fitted around the sealing ring (6221), and a trigger ring (623) is fitted and fixed around the sealing ring (6221). The outer wall of the trigger ring (623) extends outward to form a trumpet-shaped structure. The trigger ring (623) contacts the moving ring (74), and the sealing ring (6221) has multiple reserved through slots (6222).

8. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 5, wherein: The second sealing part (63) includes a second sealing ring (632). The bearing plate (61) has a circular structure. An annular cavity (631) is provided on the annular end face of the edge of the bearing plate (61). The second sealing ring (632) is sleeved and fixed on the annular cavity (631). The outer edge of the second sealing ring (632) protrudes outward to form a swingable annular sealing end (633), and the top surface of the sealing end (633) forms an annular second sealing surface (6331). A jacking section is provided on the side of the pipe away from the flow meter (a) at the sealing end (633).

9. The hydrostatic pressurization apparatus for a welded flowmeter housing as recited in claim 8, wherein: The connection between the annular sealing end (633) and the second sealing ring (632) is recessed on both sides to form two symmetrically arranged annular pre-folded grooves (634). The jacking part is located on the side of the pipe away from the flow meter (a) at the sealing end (633).

10. The hydraulic pressurization apparatus for a welded flowmeter housing as recited in claim 9, wherein: The lifting part includes a bearing ring (635), which is fixed on the bearing plate (61). A drive bladder (636) with an annular structure is fixed on the bearing ring (635). The drive bladder (636) is located inside the corresponding pre-folding groove (634), and the drive bladder (636) is externally connected to an air pump or a hydraulic pump.

Images