A kind of corrugated pipe sealing performance and pressure test device for safety valve
Patent Information
- Application Number
- CN202522482688.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-11-24
AI Technical Summary
[0004]本实用新型的目的在于提供一种安全阀用波纹管密封性能与试压测试装置，以解决上述背景技术中提出的现有的波纹管在测试时，多采用焊接固定或多组螺栓锁紧结构来固定管道，安装时需逐一对齐波纹管端口，通过螺栓组分次紧固实现密封，拆卸时则需依次松动螺栓，对于焊接固定的工装，还需额外增加切割工序以分离波纹管与测试组件，该过程操作步骤冗长，单套波纹管的拆装耗时较多，难以适应批量生产中快速检测的需求的问题
（1）通过设置的快拆机构，其能够替代现有的多组螺栓紧固或焊接固定，仅需通过对称拧紧卡箍螺栓施加径向压力，即可完成波纹管的固定，拆卸时松开螺栓即可快速分离，无需逐一对齐孔位、拆卸辅助部件，该设计将单套波纹管的拆装时间大幅度缩短，安装效率能够大幅度提升，能高效适配批量生产中的快速检测需求，显著提高整体测试线的运转效率。
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Figure CN224719578U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bellows testing technology, and in particular to a device for testing the sealing performance and pressure of bellows for safety valves. Background Technology
[0002] A bellows is a flexible, thin-walled tubular element with transverse corrugations. It is typically made of metals such as stainless steel and brass or plastics such as PP and PA. Its core characteristic is that the corrugated structure provides significant elastic deformation capacity in the axial, transverse, or angular directions, thereby absorbing pipe displacement caused by thermal expansion and contraction, vibration, or installation misalignment, while maintaining a seal and media flow.
[0003] Existing methods for testing bellows typically involve welding or multiple sets of bolts to secure the pipes. Installation requires aligning the bellows ends one by one and tightening the bolts in stages to achieve a seal. Disassembly necessitates loosening the bolts sequentially. For welded fixtures, an additional cutting process is required to separate the bellows from the testing components. This process is lengthy, and the disassembly and assembly of a single bellows unit is time-consuming, making it unsuitable for the rapid testing requirements of mass production. Therefore, we propose a testing device for the sealing performance and pressure testing of bellows used in safety valves. Utility Model Content
[0004] The purpose of this invention is to provide a device for testing the sealing performance and pressure of bellows for safety valves, in order to solve the problems mentioned in the background art. Existing bellows are mostly fixed by welding or multiple sets of bolts during testing. During installation, the bellows ports need to be aligned one by one and the bolts are tightened in stages to achieve a seal. During disassembly, the bolts need to be loosened one by one. For welding fixtures, an additional cutting process is required to separate the bellows from the test components. This process is lengthy and the disassembly and assembly of a single set of bellows is time-consuming, making it difficult to meet the needs of rapid testing in mass production.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a test device for the sealing performance and pressure testing of a bellows for a safety valve, comprising a test bench, a fixed plate fixedly connected inside the test bench, a plurality of positioning holes being provided on the outer surface of the fixed plate, a first bellows being placed inside the positioning hole, a second bellows being placed inside another positioning hole, quick-release mechanisms for rapid installation and disassembly of the first and second bellows being provided on the outer walls of the first and second bellows, and a splicing mechanism for rapid installation of a curved pipe being provided on one side of the second bellows.
[0006] Preferably, the quick-release mechanism includes a first retaining ring disposed on the outer wall of the first and second corrugated pipes. A fixing rod is fixedly connected to the rear end of the first retaining ring, and a second retaining ring is rotatably connected to the front end of the fixing rod. A bolt is fixedly connected between the first retaining ring and the fixing rod, and a wing nut is threaded onto the outer wall of the bolt. The retaining ring, in conjunction with the bolt and the wing nut, allows for quick manual disassembly and assembly of the corrugated pipes without the need for tools, improving testing and disassembly efficiency, and ensuring a stable and secure fastening mechanism that is not prone to loosening.
[0007] Preferably, the outer walls of the first and second corrugated pipes are fixedly fitted with inner frames, and the outer walls of the inner frames are fixedly fitted with sealing rings. The inner frames enhance the structural stability of the corrugated pipes, and the sealing rings fit tightly to prevent leakage, ensuring the sealing performance and accuracy of the pressure test.
[0008] Preferably, the splicing mechanism includes a connecting pipe fixedly connected to the right side of the second corrugated pipe. The inner wall of the connecting pipe is provided with a first thread, and a sealing gasket is provided inside the connecting pipe. The threaded connection of the connecting pipe facilitates quick docking, and the sealing gasket further enhances the sealing effect and improves the reliability of the test.
[0009] Preferably, a splicing pipe is placed on the right side of the connecting pipe, and the inner wall of the splicing pipe is provided with a second thread. The splicing pipe is installed on the right side of the second corrugated pipe through the second thread. The threaded connection enables the splicing pipe to be installed quickly, adapts to different test scenarios, and simplifies the connection process of curved pipes.
[0010] Preferably, the outer walls of the first corrugated pipe, the second corrugated pipe, and the splicing pipe are all fixedly fitted with multiple reinforcing rings. The splicing pipe is arranged in an L-shape. The reinforcing rings enhance the pressure resistance and structural strength of the pipe and prevent deformation and cracking during testing.
[0011] This utility model has at least the following beneficial effects: (1) The quick-release mechanism can replace the existing multiple sets of bolts for fastening or welding. Only by symmetrically tightening the clamp bolts to apply radial pressure can the corrugated pipe be fixed. When disassembling, the bolts can be loosened to quickly separate the pipe. There is no need to align the holes one by one or disassemble the auxiliary parts. This design greatly shortens the disassembly and assembly time of a single set of corrugated pipes and greatly improves the installation efficiency. It can efficiently adapt to the rapid testing needs in mass production and significantly improve the overall operating efficiency of the test line.
[0012] (2) With the splicing mechanism set, the threaded connection does not require complicated multiple bolt alignment or welding fixing process. The corrugated pipe bending section can be fixed by simply rotating the locking nut. When disassembling, it can be quickly separated by rotating in the opposite direction. The operation process is simple and efficient, and it can effectively protect the integrity of the corrugated structure of the corrugated pipe bending section and reduce irreversible damage during disassembly and pressure testing. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the splicing mechanism of this utility model; Figure 3 This is a schematic diagram of the quick-release mechanism of this utility model; Figure 4 This is a schematic diagram of the positioning hole structure of this utility model.
[0014] In the diagram: 1. Test stand; 2. Fixing plate; 21. Positioning hole; 22. First bellows; 3. Second bellows; 4. Quick release mechanism; 41. First retaining ring; 42. Fixing rod; 43. Second retaining ring; 44. Bolt; 45. Wing nut; 46. Inner frame; 47. Sealing ring; 5. Splicing mechanism; 51. Connecting pipe; 52. First thread; 53. Sealing gasket; 54. Splicing pipe; 55. Second thread; 6. Reinforcing ring. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] Please see Figures 1 to 4 This utility model provides a technical solution: a test device for the sealing performance and pressure testing of bellows for safety valves, including a test bench 1, a fixed plate 2 fixedly connected inside the test bench 1, a plurality of positioning holes 21 opened on the outer surface of the fixed plate 2, a first bellows 22 placed inside the positioning hole 21, a second bellows 3 placed inside another positioning hole 21, a quick-release mechanism 4 for quick installation and disassembly of the first bellows 22 and the second bellows 3, and a splicing mechanism 5 for quick installation of the curved pipe on one side of the second bellows 3.
[0017] The quick-release mechanism 4 includes a first retaining ring 41 disposed on the outer wall of the first corrugated pipe 22 and the second corrugated pipe 3. A fixing rod 42 is fixedly connected to the rear end of the first retaining ring 41, and a second retaining ring 43 is rotatably connected to the front end of the fixing rod 42. A bolt 44 is fixedly connected between the first retaining ring 41 and the fixing rod 42. A wing nut 45 is threaded onto the outer wall of the bolt 44. An inner frame 46 is fixedly sleeved on the outer wall of the first corrugated pipe 22 and the second corrugated pipe 3. A sealing ring 47 is fixedly sleeved on the outer wall of the inner frame 46. Through the quick-release mechanism 4, it can replace the existing multiple sets of bolts 44 for fastening or welding. Only by symmetrically tightening the clamp bolts 44 to apply radial pressure can the corrugated pipe be fixed. When disassembling, the bolts 44 can be loosened to quickly separate the pipes. There is no need to align the holes one by one or disassemble the auxiliary parts. This design greatly shortens the disassembly and assembly time of a single set of corrugated pipes, greatly improves the installation efficiency, can efficiently adapt to the rapid testing needs in mass production, and significantly improves the overall operating efficiency of the test line.
[0018] The splicing mechanism 5 includes a connecting pipe 51 fixedly connected to the right side of the second corrugated pipe 3. The inner wall of the connecting pipe 51 has a first thread 52, and a sealing gasket 53 is installed inside the connecting pipe 51. A splicing pipe 54 is placed on the right side of the connecting pipe 51, and the inner wall of the splicing pipe 54 has a second thread 55. The splicing pipe 54 is installed on the right side of the second corrugated pipe 3 via the second thread 55. Multiple reinforcing rings 6 are fixedly fitted onto the outer walls of the first corrugated pipe 22, the second corrugated pipe 3, and the splicing pipe 54. The splicing pipe 54 is L-shaped. Through the splicing mechanism 5, the threaded connection eliminates the need for complex alignment or welding of multiple sets of bolts 44. The corrugated pipe bend can be fixed simply by rotating the locking nut. Disassembly is quick and easy by rotating in the opposite direction. The operation is simple and efficient, effectively protecting the integrity of the corrugated structure of the bend and reducing irreversible damage during disassembly, assembly, and pressure testing. Working principle: When installing the first corrugated pipe 22 and the second corrugated pipe 3, the operator aligns the two corrugated pipes, places the quick-release mechanism 4 at the pipe connection, and rotates the second retaining ring 43. The first retaining ring 41 is at the upper end of the pipe, and the second retaining ring 43 is at the lower end of the pipe, thus wrapping the pipe. At this time, the inner frame 46 and the sealing ring 47 are also fixed at the pipe connection. The sealing ring 47 plays a sealing role and can fill the small gaps at the pipe connection. Then, the wing nut 45 is rotated to lock the two retaining rings, thereby fixing the pipe. When disassembly is required, the wing nut 45 is rotated in the opposite direction to loosen the two retaining rings and release them from the pipe, making it easy to remove the pipe. When installing and disassembling a pipe with bends, the operator aligns the splicing pipe 54 with the connecting pipe 51. With the first thread 52 and the second thread 55 working together, the splicing pipe 54 is rotated and tightened, thus installing the splicing pipe 54 onto the second corrugated pipe 3.
[0019] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.
[0020] It will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A test apparatus for the sealing performance and pressure testing of bellows for safety valves, comprising a test bench (1), characterized in that: The test bench (1) is fixedly connected to a fixing plate (2). The outer surface of the fixing plate (2) is provided with multiple positioning holes (21). A first corrugated pipe (22) is placed inside the positioning hole (21), and a second corrugated pipe (3) is placed inside another positioning hole (21). The outer walls of the first corrugated pipe (22) and the second corrugated pipe (3) are provided with quick-release mechanisms (4) for quick installation and disassembly of the two. A splicing mechanism (5) for quick installation of a pipe with a bend is provided on one side of the second corrugated pipe (3).
2. The device for testing the sealing performance and pressure of a bellows for a safety valve according to claim 1, characterized in that: The quick-release mechanism (4) includes a first retaining ring (41) disposed on the outer wall of the first corrugated pipe (22) and the second corrugated pipe (3). A fixing rod (42) is fixedly connected to the rear end of the first retaining ring (41). A second retaining ring (43) is rotatably connected to the front end of the fixing rod (42). A bolt (44) is fixedly connected between the first retaining ring (41) and the fixing rod (42). A wing nut (45) is threaded onto the outer wall of the bolt (44).
3. The device for testing the sealing performance and pressure of a bellows for a safety valve according to claim 1, characterized in that: The outer walls of the first corrugated pipe (22) and the second corrugated pipe (3) are fixedly sleeved with an inner frame (46), and the outer wall of the inner frame (46) is fixedly sleeved with a sealing ring (47).
4. The device for testing the sealing performance and pressure of a bellows for a safety valve according to claim 1, characterized in that: The splicing mechanism (5) includes a connecting pipe (51) fixedly connected to the right side of the second corrugated pipe (3). The inner wall of the connecting pipe (51) is provided with a first thread (52), and a sealing gasket (53) is provided inside the connecting pipe (51).
5. The device for testing the sealing performance and pressure of a bellows for a safety valve according to claim 4, characterized in that: A splicing pipe (54) is placed on the right side of the connecting pipe (51). The inner wall of the splicing pipe (54) is provided with a second thread (55), and the splicing pipe (54) is installed on the right side of the second corrugated pipe (3) through the second thread (55).
6. The device for testing the sealing performance and pressure of a bellows for a safety valve according to claim 1, characterized in that: The outer walls of the first corrugated pipe (22), the second corrugated pipe (3), and the splicing pipe (54) are all fixedly fitted with multiple reinforcing rings (6), and the splicing pipe (54) is arranged in an L shape.