Bayonet tube weld pressure measuring device
By designing a bayonet tube clamp and pipeline structure, combined with a detachable cylinder and sealing technology, the problems of large size and cumbersome operation of existing devices have been solved, enabling convenient weld pressure detection and real-time monitoring, and adapting to the application needs of narrow spaces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 新疆心连心能源化工有限公司
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-16
AI Technical Summary
Existing pressure testing devices for bayonet pipe welds are bulky and cumbersome to operate, making them difficult to use flexibly in confined spaces, and they cannot monitor the pressure-bearing status of the weld in real time.
A pressure measuring device was designed, comprising a bayonet tube clamp, an air inlet line, a pressure measuring line, and an air outlet line. It adopts a detachable front and rear cylinder structure, combined with O-ring seals and union technology, to achieve rapid fixing and sealing, and is adaptable to different pipe diameters and connection methods.
It achieves a compact and easy-to-operate weld pressure detection system that can be used flexibly in narrow spaces and can monitor the pressure status of the weld in real time, reducing operational complexity and leakage risk.
Smart Images
Figure CN224365889U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of welding technology and is a pressure measuring device for bayonet tube welds. Background Technology
[0002] In the high-pressure melamine production system, the bayonet tube, as the core heat transfer and reaction component of the reactor, directly determines the operational stability and product quality of the unit due to its structural characteristics. This component employs a multi-layered concentric tube bundle design, with the central tube and surrounding bayonet tubes forming a unique heat exchange network. Efficient heat transfer is achieved through counter-current fluid flow between the inner and outer tubes, while the density difference of urea drives the circulating reaction, completing the polycondensation process. Made of Hastelloy alloy, it meets the corrosion resistance requirements under high-temperature environments and ensures reliable sealing under high-pressure conditions. This special structure makes the bayonet tube an irreplaceable component in the reactor, possessing both enhanced heat transfer and reaction control functions.
[0003] Currently, pressure testing of bayonet pipe welds mainly relies on traditional hydraulic testing or ultrasonic testing. Hydraulic testing requires disassembling the pipeline and injecting high-pressure liquid, which is complex and carries the risk of leakage. While ultrasonic testing can perform non-destructive testing, it requires highly skilled operators and cannot directly reflect the real-time pressure status of the weld. Furthermore, existing pressure testing devices are often bulky and difficult to use flexibly in confined spaces. Therefore, there is a need for a testing device that is simple in structure, easy to operate, and capable of real-time monitoring of weld pressure. Summary of the Invention
[0004] This utility model provides a pressure testing device for bayonet tube welds, which overcomes the shortcomings of the prior art and can effectively solve the problems of large size and cumbersome operation of existing bayonet tube weld pressure testing devices.
[0005] The technical solution of this utility model is achieved through the following measures: A bayonet tube weld pressure testing device includes a bayonet tube clamp, an air inlet pipeline, a pressure testing pipeline, and an air outlet pipeline. The upper end of the air inlet pipeline is provided with a connecting neck that can communicate with it. The bayonet tube clamp is provided on the outer side of the upper part of the air inlet pipeline. The air outlet end of the air inlet pipeline is fixedly connected to the air inlet end of the pressure testing pipeline, and the air outlet end of the pressure testing pipeline is fixedly connected to the air inlet end of the air outlet pipeline. An inlet valve is fixedly connected to the air inlet pipeline, a pressure gauge is fixedly connected to the pressure testing pipeline, and an outlet valve is fixedly connected to the air outlet end of the air outlet pipeline.
[0006] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0007] The aforementioned bayonet tube clamp may include a front half-cylinder and a rear half-cylinder that can be detachably and fixedly installed together, with the inner side of the lower end of the rear half-cylinder fixedly installed together with the outer side of the upper end of the air intake pipe.
[0008] The inner side of the lower end of the aforementioned rear half of the cylinder can be fixedly installed together with the outer side of the upper end of the air intake pipe by welding.
[0009] The aforementioned bayonet tube clamp may also include a front fixing bolt, a rear fixing bolt, and a connecting bolt. Several front fixing bolts are fixedly installed on the left and right rear sides of the front half of the cylinder, and a rear fixing bolt is fixedly installed on the left and right front sides of the rear half of the cylinder corresponding to each front fixing bolt position. The front fixing bolts and rear fixing bolts at the corresponding positions are fixed together by connecting bolts.
[0010] The above may also include O-rings, with at least one O-ring spaced at intervals on the outer side of the connecting neck.
[0011] The above may further include a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe, an eighth connecting pipe, a plug, and a union. A plug is fixedly installed at the lower end of the intake pipe. The first connecting pipe is fixedly connected to the right side of the lower part of the intake pipe. The second connecting pipe is fixedly connected to the left end of the pressure measuring pipe. The first and second connecting pipes are fixedly installed together by a union. The third connecting pipe is fixedly connected to the right end of the pressure measuring pipe. The fourth connecting pipe is fixedly connected to the left end of the outlet valve. The third and fourth connecting pipes are fixedly installed together by a union. The fifth connecting pipe is fixedly connected to the front side of the middle of the intake pipe. The sixth connecting pipe is fixedly connected to the rear end of the inlet valve. The fifth and sixth connecting pipes are fixedly installed together by a union. The seventh connecting pipe is fixedly connected to the lower side of the middle of the pressure measuring pipe. The eighth connecting pipe is fixedly connected to the upper end of the pressure gauge. The seventh and eighth connecting pipes are fixedly installed together by a union.
[0012] This utility model has a reasonable and compact structure and is easy to use. By setting a front half-cylinder and a rear half-cylinder, the bayonet tube can be fixed after it is inserted into the outside of the connecting neck. It has the characteristics of stability, efficiency and speed. Attached Figure Description
[0013] Appendix Figure 1 These are schematic diagrams of the main structure of embodiments 1 to 6 of this utility model.
[0014] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the left-side view structure.
[0015] Appendix Figure 3 For the appendix Figure 1 A cross-sectional structural diagram.
[0016] The codes in the attached diagram are as follows: 1 is the inlet pipe, 2 is the pressure measuring pipe, 3 is the outlet pipe, 4 is the inlet valve, 5 is the outlet valve, 6 is the pressure gauge, 7 is the front half of the cylinder, 8 is the rear half of the cylinder, 9 is the front fixing bolt, 10 is the rear fixing bolt, 11 is the O-ring seal, 12 is the first connecting pipe, 13 is the second connecting pipe, 14 is the third connecting pipe, 15 is the fourth connecting pipe, 16 is the fifth connecting pipe, 17 is the sixth connecting pipe, 18 is the seventh connecting pipe, 19 is the eighth connecting pipe, 20 is the plug, 21 is the union, and 22 is the connecting neck. Detailed Implementation
[0017] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.
[0018] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a central A-axis method, and the positional relationships such as front, back, top, bottom, left, and right are determined based on the layout direction of the attached diagram in the instruction manual.
[0019] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0020] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the bayonet tube weld pressure testing device includes a bayonet tube clamp, an air inlet line 1, a pressure testing line 2, and an air outlet line 3. The upper end of the air inlet line 1 is provided with a connecting neck 22 that can communicate with it. The bayonet tube clamp is provided on the outer side of the upper part of the air inlet line 1. The air outlet end of the air inlet line 1 is fixedly connected to the air inlet end of the pressure testing line 2. The air outlet end of the pressure testing line 2 is fixedly connected to the air inlet end of the air outlet line 3. An inlet valve 4 is fixedly connected to the air inlet line 1. A pressure gauge 6 is fixedly connected to the pressure testing line 2. An outlet valve 5 is fixedly connected to the air outlet end of the air outlet line 3. During use, insert the bayonet tube into the connecting neck 22 and fix the bayonet tube to the air inlet line 1 using the bayonet tube clamp. Open the inlet valve 4 and supply inert gas at a certain pressure. When the pressure gauge 6 reading is constant, stop supplying gas, close the inlet valve 4, and continue to observe the pressure gauge 6 reading. After a period of time, based on the reading displayed on the pressure gauge 6, complete the pressure resistance test of the bayonet tube weld. After the test is closed, open the outlet valve 5 to discharge the gas.
[0021] The above-mentioned bayonet tube weld pressure testing device can be further optimized and / or improved according to actual needs:
[0022] Example 2: As shown in the attached document Figure 1 , 2As shown in Figure 3, the bayonet tube clamp includes a front half-cylinder 7 and a rear half-cylinder 8 that can be detachably and fixedly installed together. The inner side of the lower end of the rear half-cylinder 8 is fixedly installed to the outer side of the upper end of the air intake pipe 1. During use, by setting the front half-cylinder 7 and the rear half-cylinder 8, the bayonet tube can be fixed after being inserted into the outer side of the connecting neck 22, and non-destructive disassembly can be achieved in the bayonet tube pressure test, avoiding the risk of damage to the base material.
[0023] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the inner side of the lower end of the rear half-cylinder 8 is fixedly installed to the outer side of the upper end of the air intake pipe 1 by welding. During use, this arrangement facilitates the removal of the front half-cylinder 7, allowing the bayonet tube to be placed inside the rear half-cylinder 8, thus completing the insertion of the bayonet tube end into the connecting neck 22.
[0024] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figure 3, the bayonet tube clamp also includes a front fixing bolt 9, a rear fixing bolt 10, and connecting bolts. Several front fixing bolts 9 are fixedly installed on the left and right rear sides of the front half-cylinder 7. Corresponding to each position of the front fixing bolt 9, a rear fixing bolt 10 is fixedly installed on the left and right front sides of the rear half-cylinder 8. The corresponding front fixing bolts 9 and rear fixing bolts 10 are all fixed together by connecting bolts. During use, the bolt-fixed design of the front half-cylinder 7 and the rear half-cylinder 8 significantly enhances the structural adaptability and maintenance flexibility of the equipment. This mechanical connection method, controlled by the preload of the threaded pair, ensures connection rigidity while retaining a small adjustment range, accurately compensating for assembly deviations caused by machining errors. It is particularly suitable for fixing the bayonet tube after it is inserted onto the outside of the connecting neck 22, enabling non-destructive disassembly during bayonet tube pressure testing and avoiding the risk of damage to the base material.
[0025] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figure 3, it also includes O-ring seals 11, with at least one O-ring seal 11 spaced vertically on the outer side of the connecting neck 22. During use, the bayonet tube and connecting neck 22 are connected via a plug-in method combined with the O-ring seal 11 design, which effectively improves the sealing reliability and construction efficiency during pressure testing. The plug-in structure simplifies the pipe connection process through the precise fit between the socket and the spigot, allowing installation to be completed without complex processing or special tools. It is particularly suitable for rapid connection of bayonet tubes during weld pressure testing, preserving the original structural integrity of the pipe. Furthermore, the O-ring seal 11, as the core sealing element, utilizes its self-tightening characteristic of a circular cross-section to form uniform elastic contact stress at the plug-in location, effectively blocking the leakage path of the fluid medium. It is also compatible with various chemical substances and temperature conditions, meeting the requirements for weld pressure testing.
[0026] Example 6: As shown in the appendix Figure 1 , 2 As shown in Figure 3, it also includes a first connecting pipe 12, a second connecting pipe 13, a third connecting pipe 14, a fourth connecting pipe 15, a fifth connecting pipe 16, a sixth connecting pipe 17, a seventh connecting pipe 18, an eighth connecting pipe 19, a plug 20, and a union 21. A plug 20 is fixedly installed at the lower end of the intake pipe 1. The first connecting pipe 12 is fixedly connected to the lower right side of the intake pipe 1. The second connecting pipe 13 is fixedly connected to the left end of the pressure testing pipe 2. The first connecting pipe 12 and the second connecting pipe 13 are fixedly installed together via the union 21. The third connecting pipe 14 is fixedly connected to the right end of the pressure testing pipe 2. The left end of outlet valve 5 is fixedly connected to a fourth connecting pipe 15. The third connecting pipe 14 and the fourth connecting pipe 15 are fixedly installed together via a union 21. The front side of the middle section of inlet pipeline 1 is fixedly connected to a fifth connecting pipe 16. The rear end of inlet valve 4 is fixedly connected to a sixth connecting pipe 17. The fifth connecting pipe 16 and the sixth connecting pipe 17 are fixedly installed together via a union 21. The lower side of the middle section of pressure measuring pipeline 2 is fixedly connected to a seventh connecting pipe 18. The upper end of pressure gauge 6 is fixedly connected to an eighth connecting pipe 19. The seventh connecting pipe 18 and the eighth connecting pipe 19 are fixedly installed together via a union 21. During use, by setting up union 21 and using the fixing method of union 21, components such as inlet pipeline 1, pressure measuring pipeline 2, and outlet pipeline 3 can be disassembled and stored, which also facilitates assembly and carrying. The use of union 21 technology for pipe connections can significantly improve the flexibility and maintenance efficiency of the system. Its core advantages are reflected in the structural design and functional adaptability. The Union 21 achieves rapid assembly through the precise fit of the nut, cloud head, and flat joint, allowing for pipe disassembly and reassembly without complex tools. It is particularly suitable for scenarios requiring frequent maintenance or adjustments to pipeline layout, effectively reducing manual labor intensity and downtime. Furthermore, this technology utilizes high-strength alloy materials and a sealed composite structure design, maintaining stable sealing performance even in high-pressure, high-temperature, and corrosive media environments. Its pressure-bearing capacity matches the strength of the base material, avoiding the deformation risks caused by thermal stress in traditional welding or flange connections. Therefore, compared to fixed connection methods, the Union 21 structure can adapt to displacement changes caused by thermal expansion and contraction of pipelines. In addition, its modular design allows the Union 21 unit to be adapted to different pipe diameters and connection types, achieving precise docking even in narrow spaces or dense pipe layouts, providing technical support for the dynamic maintenance of complex pipeline systems.
[0027] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
Claims
1. A pressure testing device for bayonet tube welds, characterized in that... It includes a bayonet tube clamp, an air inlet line, a pressure measuring line, and an air outlet line. The upper end of the air inlet line is equipped with a connecting neck that can communicate with it. The bayonet tube clamp is located on the outer side of the upper part of the air inlet line. The air outlet end of the air inlet line is fixedly connected to the air inlet end of the pressure measuring line, and the air outlet end of the pressure measuring line is fixedly connected to the air inlet end of the air outlet line. An inlet valve is fixedly connected to the air inlet line, a pressure gauge is fixedly connected to the pressure measuring line, and an outlet valve is fixedly connected to the air outlet end of the air outlet line.
2. The bayonet tube weld pressure measuring device according to claim 1, characterized in that... The bayonet tube clamp includes a front half-cylinder and a rear half-cylinder that can be detachably and fixedly installed together, with the inner side of the lower end of the rear half-cylinder fixedly installed to the outer side of the upper end of the air intake pipe.
3. The bayonet tube weld pressure measuring device according to claim 2, characterized in that... The lower inner side of the rear half of the cylinder is fixedly installed to the upper outer side of the air intake pipe by welding.
4. The bayonet tube weld pressure measuring device according to claim 2 or 3, characterized in that... The bayonet barrel clamp also includes front fixing bolts, rear fixing bolts, and connecting bolts. Several front fixing bolts are fixedly installed on the left and right rear parts of the front half of the cylinder, and rear fixing bolts are fixedly installed on the left and right front parts of the rear half of the cylinder corresponding to each front fixing bolt position. The front fixing bolts and rear fixing bolts at the corresponding positions are fixed together by connecting bolts.
5. The pressure testing device for bayonet tube welds according to claim 1, 2, or 3, characterized in that... It also includes O-rings, with at least one O-ring spaced at intervals on the outer side of the connecting neck.
6. The bayonet tube weld pressure measuring device according to claim 4, characterized in that... It also includes O-rings, with at least one O-ring spaced at intervals on the outer side of the connecting neck.
7. The pressure testing device for bayonet tube welds according to claim 1, 2, 3, or 6, characterized in that... It also includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe, an eighth connecting pipe, a plug, and a union. A plug is fixedly installed at the lower end of the intake pipe. The first connecting pipe is fixedly connected to the right side of the lower part of the intake pipe. The second connecting pipe is fixedly connected to the left end of the pressure measuring pipe. The first and second connecting pipes are fixedly installed together by a union. The third connecting pipe is fixedly connected to the right end of the pressure measuring pipe. The fourth connecting pipe is fixedly connected to the left end of the outlet valve. The third and fourth connecting pipes are fixedly installed together by a union. The fifth connecting pipe is fixedly connected to the front side of the middle of the intake pipe. The sixth connecting pipe is fixedly connected to the rear end of the inlet valve. The fifth and sixth connecting pipes are fixedly installed together by a union. The seventh connecting pipe is fixedly connected to the lower side of the middle of the pressure measuring pipe. The eighth connecting pipe is fixedly connected to the upper end of the pressure gauge. The seventh and eighth connecting pipes are fixedly installed together by a union.
8. The bayonet tube weld pressure measuring device according to claim 6, characterized in that... It also includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe, an eighth connecting pipe, a plug, and a union. A plug is fixedly installed at the lower end of the intake pipe. The first connecting pipe is fixedly connected to the right side of the lower part of the intake pipe. The second connecting pipe is fixedly connected to the left end of the pressure measuring pipe. The first and second connecting pipes are fixedly installed together by a union. The third connecting pipe is fixedly connected to the right end of the pressure measuring pipe. The fourth connecting pipe is fixedly connected to the left end of the outlet valve. The third and fourth connecting pipes are fixedly installed together by a union. The fifth connecting pipe is fixedly connected to the front side of the middle of the intake pipe. The sixth connecting pipe is fixedly connected to the rear end of the inlet valve. The fifth and sixth connecting pipes are fixedly installed together by a union. The seventh connecting pipe is fixedly connected to the lower side of the middle of the pressure measuring pipe. The eighth connecting pipe is fixedly connected to the upper end of the pressure gauge. The seventh and eighth connecting pipes are fixedly installed together by a union.
9. The pressure measuring device for bayonet tube welds according to claim 1, 2, 3, 6, 7, or 8, characterized in that... It also includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe, an eighth connecting pipe, a plug, and a union. A plug is fixedly installed at the lower end of the intake pipe. The first connecting pipe is fixedly connected to the right side of the lower part of the intake pipe. The second connecting pipe is fixedly connected to the left end of the pressure measuring pipe. The first and second connecting pipes are fixedly installed together by a union. The third connecting pipe is fixedly connected to the right end of the pressure measuring pipe. The fourth connecting pipe is fixedly connected to the left end of the outlet valve. The third and fourth connecting pipes are fixedly installed together by a union. The fifth connecting pipe is fixedly connected to the front side of the middle of the intake pipe. The sixth connecting pipe is fixedly connected to the rear end of the inlet valve. The fifth and sixth connecting pipes are fixedly installed together by a union. The seventh connecting pipe is fixedly connected to the lower side of the middle of the pressure measuring pipe. The eighth connecting pipe is fixedly connected to the upper end of the pressure gauge. The seventh and eighth connecting pipes are fixedly installed together by a union.