Corrugated pipe sealing and fixing tool for pressure test
By designing a bellows sealed and fixed tooling including a positioning ring, expansion ring strip and adjustment locking mechanism, the problem of axial deformation of metal bellows due to elastic properties in pressure tests is solved, and higher test accuracy and tooling suitability are achieved.
Patent Information
- Application Number
- CN202421890287.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-06
AI Technical Summary
Due to its elastic properties in the pressure test, metal corrugated pipes are prone to axial compression deformation when subjected to external water pressure under sealing state, affecting the accuracy of the pressure test.
A corrugated pipe sealing fixing tool for pressure testing is designed, adopting a structure including a fixing seat, a sealing plate, an adjustment locking mechanism, a positioning ring, an expansion ring strip and a bottom wheel. Through the coordination of the positioning ring and the expansion ring strip, a firm sealing at both ends of the bellows and the length adjustment of the adjustment locking mechanism is achieved, reducing the axial deformation caused by the bellows during the test.
It effectively reduces the axial deformation caused by corrugated pipes in pressure testing, improves the accuracy of the test, and makes the tooling suitable for corrugated pipes of various length specifications, enhancing the applicability.
Smart Images
Figure CN223029488U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bellows tooling structures, and particularly to a bellows sealing and fixing tooling for pressure testing. Background Art
[0002] A metal bellows refers to a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and telescoping direction, and is widely used in fields such as automatic control and measuring instruments, vacuum technology, mechanical industry, electric power industry, transportation, and atomic energy industry.
[0003] As an elastic element, the metal bellows is widely used in various fields. There is a problem that cannot be ignored in the design and application of the metal bellows, which is the pressure-bearing capacity of the metal bellows. The so-called pressure-bearing capacity of the metal bellows refers to that the metal bellows is not damaged under a certain pressure and its own deformation amount is within a certain range. The pressure-bearing capacity of the metal bellows directly affects its own service life and application occasions.
[0004] In the related art, in order to facilitate the testing of the pressure-bearing capacity of the metal bellows, both ends of the bellows to be detected are closed and then placed in a closed container. Subsequently, water is injected into the closed container and pressure holding treatment is carried out. The pressure-bearing capacity of the metal bellows is reflected by detecting whether the water pressure in the closed container decreases significantly.
[0005] Regarding the above technical solution, the inventor believes that the metal bellows has elasticity. In the sealed state, when the bellows is subjected to the external water pressure, it can produce axial compression deformation, thus affecting the accuracy of the pressure test. Summary of the Utility Model
[0006] In order to reduce the possibility of axial deformation of the bellows during pressure testing, this application provides a bellows sealing and fixing tooling for pressure testing.
[0007] A bellows sealing and fixing tooling for pressure testing provided by this application adopts the following technical solution:
[0008] A bellows sealing and fixing tooling for pressure testing includes a fixed seat and a pair of sealing plates arranged on the fixed seat. The fixed seat is provided with an adjustment and locking mechanism capable of adjusting and locking the relative positions of the two sealing plates. On the opposite sides of the two sealing plates, positioning rings are provided. The outer diameter of the positioning ring is adapted to the diameters of the two ends of the bellows to be detected. A ring groove is provided on the outer side of the positioning ring, and an expansion ring strip is arranged in the ring groove.
[0009] By adopting the above technical solution, when sealing both ends of the corrugated pipe, the positioning rings are respectively aligned with the two ends of the corrugated pipe and inserted. Subsequently, air, water or other fluids are injected into the expansion ring strip to cause the expansion ring strip to expand. The outer side of the expanded expansion ring strip abuts against the inner wall of the two ends of the corrugated pipe, ensuring that the positioning ring and the sealing plate are firmly connected to the interface of the corrugated pipe. In addition, the expanded expansion ring strip can also act as a sealing ring between the positioning ring and the interface of the corrugated pipe, ensuring the sealing of both ends of the corrugated pipe. By adjusting the locking mechanism, the distance between the two sealing plates can be adjusted according to the length of the corrugated pipe to be measured and the relative positions of the two sealing plates can be locked. On the one hand, this tooling can be applicable to corrugated pipes of various length specifications, improving the applicability of this tooling; on the other hand, the two sealing plates are relatively fixed, which can reduce the possibility of axial deformation of the corrugated pipe during pressure testing.
[0010] Optionally, the inner side of the expansion ring strip is fixed to the bottom wall of the annular groove, and when the expansion ring strip is in a natural state, the outer diameter of the expansion ring strip is smaller than the outer diameter of the positioning ring, and when the expansion ring strip is in an expansion limit state, the outer diameter of the expansion ring strip is larger than the outer diameter of the positioning ring.
[0011] By adopting the above technical solution, on the one hand, it ensures that the positioning ring can be smoothly inserted into the corresponding corrugated pipe interface, and on the other hand, it ensures that when the expansion ring strip expands after the positioning ring is inserted in place, it can fill the annular groove by itself, ensuring the sealing between the outer wall of the positioning ring and the inner wall of the corrugated pipe interface.
[0012] Optionally, an input nozzle is provided on the side of the sealing plate facing away from the corresponding positioning ring, a plug is provided at the opening of the input nozzle, a connecting pipe fitting is provided on the inner side of the expansion ring strip, one end of the connecting pipe fitting communicates with the inner cavity of the expansion ring strip, and the other end communicates with the input nozzle.
[0013] By adopting the above technical solution, air, water or other fluids can be injected into the expansion ring strip through the input nozzle, and the input nozzle can be blocked by the plug, so that the expansion ring strip maintains an expanded state.
[0014] Optionally, a chamfered surface is provided on the outer side of the end of the positioning ring away from the corresponding sealing plate.
[0015] By adopting the above technical solution, the chamfered surface has a guiding function and can reduce the docking difficulty when the positioning ring is inserted into the corresponding corrugated pipe interface.
[0016] Optionally, the adjustment and locking mechanism includes adjustment and locking components respectively arranged on the opposite sides of the two sealing plates. The adjustment and locking component includes a fixed side plate, an inner tube, an outer sleeve and a locking bolt. The fixed side plate is fixed on the fixed seat. The outer sleeve is sleeved on the inner tube and arranged along the axial direction of the positioning ring. The inner tube is fixed to the fixed side plate. The outer sleeve is fixed to the sealing plate. The locking bolt is threadedly connected to the outer sleeve, and the tail of the locking bolt abuts against the inner tube.
[0017] By adopting the above technical solution, the inner tube and the outer tube together form a telescopic sleeve structure, so that the tooling is applicable to bellows of various length specifications; the relative positions of the inner tube and the outer tube can be locked by the locking bolt, so as to achieve the purpose of fixing the sealing plate. The structure is simple and the operation is convenient.
[0018] Optionally, the inner tube is a non-circular tube structure.
[0019] By adopting the above technical solution, the possibility of relative rotation between the inner tube and the outer tube when adjusting the relative positions of the two sealing plates can be avoided, so as to prevent the sealing plate from deflecting and causing the position of the input nozzle to deviate, which is inconvenient for connecting the input nozzle to the external fluid medium output device.
[0020] Optionally, a bottom wheel is provided at the bottom end of the sealing plate. The moving direction of the bottom wheel is the same as the axial direction of the positioning ring, and the wheel surface of the bottom wheel abuts against the fixed seat.
[0021] By adopting the above technical solution, the bottom wheel can support the sealing plate and reduce the phenomenon of jamming when sliding the outer sleeve.
[0022] Optionally, a convex rail arranged along the axial direction of the positioning ring is provided on the fixed seat, and a wheel groove adapted to the convex rail is provided on the wheel surface of the bottom wheel.
[0023] By adopting the above technical solution, through the arrangement of the convex rail and the wheel groove, the convex rail can guide the movement of the bottom wheel, and further improve the smoothness of adjusting the position of the sealing plate.
[0024] In summary, the present application includes at least one of the following beneficial technical effects:
[0025] 1. Through the setting of the adjustment and locking mechanism, the distance between the two sealing plates can be adjusted according to the length of the bellows to be measured and the relative positions of the two sealing plates can be locked. On the one hand, the tooling can be applicable to bellows of various length specifications, improving the applicability of the tooling; on the other hand, the two sealing plates are relatively fixed, which can reduce the possibility of axial deformation of the bellows during pressure testing.
[0026] 2. By setting the expansion ring strip, when sealing both ends of the bellows, the positioning rings are respectively aligned with the two ends of the bellows and inserted. Subsequently, air, water or other fluids are injected into the expansion ring strip to cause it to expand. The outer side of the expanded expansion ring strip abuts against the inner walls of the two ends of the bellows, ensuring a reliable connection between the positioning rings and the sealing plates and the interfaces of the bellows. In addition, the expanded expansion ring strip can also act as a sealing ring between the positioning ring and the bellows interface, ensuring the sealing performance of both ends of the bellows.
[0027] 3. By setting the bottom wheels, the sealing plates can be supported, reducing the phenomenon of jamming when sliding the outer sleeve pipe. Description of the Drawings
[0028] Figure 1 is the overall structural schematic diagram of a bellows sealing and fixing tooling for pressure testing in an embodiment of the present application.
[0029] Figure 2 is a quarter-sectional view showing the connection relationship between the positioning ring, the expansion ring strip and the input nozzle in an embodiment of the present application.
[0030] Figure 3 is Figure 2 the partial enlarged schematic diagram at A in
[0031] Figure 4 is the structural schematic diagram showing the adjustment and locking assembly in an embodiment of the present application.
[0032] Description of the Reference Numerals: 1, fixed seat; 11, convex rail; 2, sealing plate; 21, positioning ring; 211, ring groove; 212, chamfered surface; 22, expansion ring strip; 23, input nozzle; 231, plug; 24, connecting pipe fitting; 25, bottom wheel; 251, wheel groove; 3, adjustment and locking mechanism; 31, fixed side plate; 32, inner pipe; 33, outer sleeve; 34, locking bolt. Detailed Embodiment
[0033] The following will further elaborate on the present application in conjunction with the attached Figures 1-4 , for a more detailed description of the present application.
[0034] Embodiment:
[0035] An embodiment of the present application discloses a bellows sealing and fixing tooling for pressure testing. Referring to Figure 1 , a bellows sealing and fixing tooling for pressure testing includes a fixed seat 1 and a pair of sealing plates 2 oppositely arranged on the fixed seat 1. To make the tooling applicable to bellows of various length specifications and improve the applicability of the tooling, an adjustment and locking mechanism 3 for adjusting and locking the relative positions of the two sealing plates 2 is provided on the fixed seat 1. In this embodiment, the sealing plate 2 is a circular plate.
[0036] Referring to Figures 1-3, on the opposite sides of the two sealing plates 2, positioning rings 21 are fixedly installed, and the orthographic projection of the positioning ring 21 on the corresponding sealing plate 2 is completely located on the sealing plate 2. The outer diameter of the positioning ring 21 is adapted to the caliber of the two ends of the bellows to be detected. A ring groove 211 is formed on the outer side of the positioning ring 21, and an expansion ring strip 22 is installed in the ring groove 211. The expansion ring strip 22 is a ring-shaped strip hollow structure. In this embodiment, the expansion ring strip 22 is made of rubber material.
[0037] When sealing the two ends of the bellows, align the positioning rings 21 with the two ends of the bellows respectively and insert them. Subsequently, inject air, water or other fluids into the expansion ring strip 22 to cause the expansion ring strip 22 to expand. The outer side of the expanded expansion ring strip 22 abuts against the inner wall of the two ends of the bellows, ensuring that the positioning ring 21 and the sealing plate 2 are firmly connected to the bellows interface. In addition, the expanded expansion ring strip 22 can also act as a sealing ring between the positioning ring 21 and the bellows interface, ensuring the sealing performance of the two ends of the bellows.
[0038] Refer to Figure 3 , the inner side of the expansion ring strip 22 is adhesively fixed to the bottom wall of the ring groove 211 in a form fixed by sealant. When the expansion ring strip 22 is in a natural state, the outer diameter of the expansion ring strip 22 is smaller than the outer diameter of the positioning ring 21; when the expansion ring strip 22 is in the expansion limit state, the outer diameter of the expansion ring strip 22 is larger than the outer diameter of the positioning ring 21. In this way, on the one hand, it ensures that the positioning ring 21 can be smoothly inserted into the corresponding bellows interface. On the other hand, it ensures that when the expansion ring strip 22 expands after the positioning ring 21 is inserted in place, it can fill the ring groove 211, ensuring the sealing performance between the outer wall of the positioning ring 21 and the inner wall of the bellows interface.
[0039] Refer to Figure 3 , an input nozzle 23 is fixedly inserted on the side of the sealing plate 2 away from the corresponding positioning ring 21. A plug 231 is provided at the external opening of the input nozzle 23. A connecting pipe fitting 24 is connected to the inner side of the expansion ring strip 22. One end of the connecting pipe fitting 24 communicates with the inner cavity of the expansion ring strip 22, and the other end passes through the outer side of the positioning ring 21 and the inner side of the positioning ring 21 and communicates with the side of the input nozzle 23 away from the plug 231. In this way, air, water or other fluids can be injected into the expansion ring strip 22 through the input nozzle 23, and the input nozzle 23 can be blocked by the plug 231 to keep the expansion ring strip 22 in an expanded state.
[0040] Refer to Figure 2 , a chamfer surface 212 is provided on the outer side of the end of the positioning ring 21 away from the corresponding sealing plate 2. The chamfer surface 212 has a guiding function and can reduce the docking difficulty when the positioning ring 21 is inserted into the corresponding bellows interface.
[0041] Refer to Figure 1 and Figure 4, the adjustment and locking mechanism 3 includes adjustment and locking components respectively arranged on the opposite sides of the two sealing plates 2. The adjustment and locking components include a fixed side plate 31, an inner tube 32, an outer sleeve 33, and a locking bolt 34. The fixed side plate 31 is fixed to the top of the fixed seat 1. The outer sleeve 33 is sleeved on the inner tube 32 and is arranged along the axial direction of the positioning ring 21. The inner tube 32 is fixed to the fixed side plate 31, and the outer sleeve 33 is fixed to the sealing plate 2. The locking bolt 34 is threadedly connected to the side wall of the outer sleeve 33, and the tail of the locking bolt 34 abuts against the outer side wall of the inner tube 32. In this way, the inner tube 32 and the outer sleeve together form a telescopic sleeve structure, so that the tooling is applicable to bellows of various length specifications. The relative position of the inner tube 32 and the outer sleeve can be locked by the locking bolt 34, so as to fix the sealing plate 2, thereby reducing the possibility of axial deformation of the bellows during the pressure test.
[0042] Referring to Figure 1 and Figure 4 , the inner tube 32 is a non-circular tube structure. In this embodiment, the inner tube 32 is a square tube fitting, which can avoid the possibility of relative rotation between the inner tube 32 and the outer sleeve when adjusting the relative position of the two sealing plates 2, so as to prevent the sealing plate 2 from deflecting and causing the position of the input nozzle 23 to deviate, which is inconvenient for the connection between the input nozzle 23 and the external fluid medium output device.
[0043] Referring to Figures 1-2 , a bottom wheel 25 is installed at the bottom end of the sealing plate 2. The moving direction of the bottom wheel 25 is the same as the axial direction of the positioning ring 21, and the wheel surface of the bottom wheel 25 abuts against the fixed seat 1. A convex rail 11 arranged along the axial direction of the positioning ring 21 is fixed to the top of the fixed seat 1, and a wheel groove 251 adapted to the convex rail 11 is formed on the wheel surface of the bottom wheel 25. In this way, the bottom wheel 25 can support the sealing plate 2 and reduce the phenomenon of jamming when sliding the outer sleeve. Through the arrangement of the convex rail 11 and the wheel groove 251, the convex rail 11 can guide the movement of the bottom wheel 25, further improving the smoothness of adjusting the position of the sealing plate 2.
[0044] The implementation principle of a bellows sealing and fixing tooling for pressure testing in this embodiment is as follows: When sealing both ends of the bellows, the positioning rings 21 are respectively aligned with the two ends of the bellows interface and inserted. Then, air, water or other fluids are injected into the expansion ring strip 22 to cause the expansion ring strip 22 to expand. The outer side of the expanded expansion ring strip 22 abuts against the inner walls of the two ends of the bellows interface, ensuring a reliable connection between the positioning ring 21 and the sealing plate 2 and the bellows interface. In addition, the expanded expansion ring strip 22 can also act as a sealing ring between the positioning ring 21 and the bellows interface, ensuring the sealing of both ends of the bellows.
[0045] By adjusting the locking mechanism 3, the distance between the two sealing plates 2 can be adjusted according to the length of the bellows to be measured, and the relative positions of the two sealing plates 2 can be locked. On the one hand, the tooling can be applicable to bellows of various length specifications, improving the applicability of the tooling; on the other hand, the two sealing plates 2 are relatively fixed, which can reduce the possibility of axial deformation of the bellows during pressure testing.
[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A bellows sealing fixture for pressure testing, characterized in that: The invention comprises a fixing seat (1) and a pair of sealing plates (2) arranged on the fixing seat (1); the fixing seat (1) is provided with an adjustment locking mechanism (3) capable of adjusting and locking the relative positions of the two sealing plates (2); a positioning ring (21) is provided on the opposite side of the two sealing plates (2); the outer diameter of the positioning ring (21) is matched with the diameter of the interface at both ends of the corrugated pipe to be tested; an annular groove (211) is provided on the outer side of the positioning ring (21); and an expansion ring strip (22) is provided in the annular groove (211).
2. The bellows sealing and fixing tool for pressure testing according to claim 1, characterized in that: The inner side of the expansion ring strip (22) is fixed to the bottom wall of the ring groove (211), and when the expansion ring strip (22) is in a natural state, the outer diameter of the expansion ring strip (22) is smaller than the outer diameter of the positioning ring (21), and when the expansion ring strip (22) is in an expansion limit state, the outer diameter of the expansion ring strip (22) is larger than the outer diameter of the positioning ring (21).
3. The bellows sealing and fixing tool for pressure testing according to claim 2, characterized in that: An input nozzle (23) is provided on the side of the sealing plate (2) facing away from the corresponding positioning ring (21), a plug (231) is provided at the opening of the input nozzle (23), a connecting pipe (24) is provided on the inner side of the expansion ring strip (22), one end of the connecting pipe (24) is connected to the inner cavity of the expansion ring strip (22), and the other end is connected to the input nozzle (23).
4. The bellows sealing and fixing tool for pressure testing according to claim 3, characterized in that: A chamfered surface (212) is provided on the outer side of one end of the positioning ring (21) away from the corresponding sealing plate (2).
5. The bellows sealing and fixing tool for pressure testing according to claim 1, characterized in that: The adjusting locking mechanism (3) comprises an adjusting locking assembly respectively arranged on opposite sides of the two sealing plates (2), the adjusting locking assembly comprising a fixed side plate (31), an inner tube (32), an outer sleeve (33) and a locking bolt (34), the fixed side plate (31) being fixed on the fixing seat (1), the outer sleeve (33) being sleeved on the inner tube (32) and arranged along the axial direction of the positioning ring (21), the inner tube (32) being fixed to the fixed side plate (31), the outer sleeve (33) being fixed to the sealing plate (2), the locking bolt (34) being threadedly connected to the outer sleeve (33), and the tail of the locking bolt (34) being in contact with the inner tube (32).
6. The bellows sealing and fixing tool for pressure testing according to claim 5, characterized in that: The inner tube (32) is a non-circular tube structure.
7. The bellows sealing and fixing tool for pressure testing according to claim 6, characterized in that: A bottom wheel (25) is provided at the bottom end of the sealing plate (2), the moving direction of the bottom wheel (25) is the same as the axial direction of the positioning ring (21), and the wheel surface of the bottom wheel (25) is in contact with the fixing seat (1).
8. The bellows sealing and fixing tool for pressure testing according to claim 7, characterized in that: The fixing seat (1) is provided with a convex track (11) arranged axially along the positioning ring (21), and the wheel surface of the bottom wheel (25) is provided with a wheel groove (251) matched with the convex track (11).