A welding bellows pressure temperature fatigue testing machine

Abstract

The utility model discloses a kind of welding corrugated pipe pressure temperature fatigue testing machine, belong to corrugated pipe testing technical field, including bottom plate, the upper surface of bottom plate is fixedly installed with stand, the upper end of stand is fixedly installed with top plate, the lower surface of top plate is fixedly installed with fixed seat, the output end of power component is fixedly installed in rotating inner core, the upper surface of bottom plate is fixedly installed with electric cylinder, the output end of electric cylinder is fixedly installed with movable seat, the lower surface of fixed seat is evenly fixedly installed with upper clamping assembly, the utility model integrates mechanical fatigue testing mechanism, pressure test function and temperature test function, in addition to can complete above-mentioned test, fatigue test, pressure test and temperature test superposition test of corrugated pipe can be simultaneously in one test, and real simulation composite load condition that it bears in practical application can be carried out, greatly improve the integrity of test and the authenticity of working condition reproduction.

Description

Technical Field

[0001] This utility model belongs to the field of corrugated pipe testing technology, and specifically provides a pressure and temperature fatigue testing machine for welded corrugated pipes. Background Technology

[0002] Welded bellows, as a key flexible component capable of absorbing displacement, compensating for errors, and isolating vibrations, are widely used in aerospace, semiconductor manufacturing, vacuum systems, and high-end fluid pipelines—fields with extremely high reliability requirements. Under these complex operating conditions, bellows not only endure axial mechanical reciprocating motion, but the pressure and temperature of their internal media are also often in a state of dramatic alternation, and the flow of the media may generate non-uniform pressure distribution and fluid impact. Traditional testing equipment is usually single-function, capable only of static pressure testing or mechanical fatigue testing under isothermal conditions, making it difficult to reproduce the real-world working environment of the coupled multi-physics fields (mechanical motion, pressure, temperature, and dynamic flow field). This leads to significant discrepancies between the bellows life and reliability assessed based on traditional test data and actual service performance, failing to provide sufficient basis for the design, selection, and safety assessment of high-end equipment. Therefore, there is an urgent need in this field for a comprehensive testing device capable of simultaneously and integratedly simulating mechanical fatigue, pressure cycling, temperature changes, and internal fluid dynamics to more realistically and accurately evaluate the comprehensive performance and durability of welded bellows under complex operating conditions. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a pressure and temperature fatigue testing machine for welded bellows.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pressure and temperature fatigue testing machine for welded corrugated pipes, comprising a base plate, columns fixedly installed around the upper surface of the base plate, a top plate fixedly installed at the upper end of the columns, a fixed seat fixedly installed on the lower surface of the top plate, and a power assembly assembled inside the fixed seat. The output end of the power assembly is fixedly installed in a rotating inner core. An electric cylinder is fixedly installed on the upper surface of the base plate, and a movable seat is fixedly installed at the output end of the electric cylinder. An upper clamping assembly is uniformly fixedly installed on the lower surface of the fixed seat, and lower clamping assemblies symmetrically distributed with the upper clamping assembly are uniformly fixedly installed on the upper surface of the movable seat. The two ends of the corrugated pipe are respectively fixed inside the upper clamping assembly and the lower clamping assembly, and the rotating inner core is located inside the corrugated pipe. The rotating inner core is connected to an external pressure device.

[0005] Furthermore, guide columns are symmetrically fixedly installed between the bottom plate and the top plate, and guide blocks are symmetrically fixedly installed on the side wall of the movable seat. The outer wall of the guide block is provided with a sliding groove, and the sliding groove is sleeved on the guide column.

[0006] Furthermore, the upper clamping assembly includes a circular plate, an arc-shaped clamping plate, and a spring sheet. The side wall of the circular plate has an annular groove, and the inner wall of the annular groove has symmetrical slots. The inner walls of the two arc-shaped clamping plates are integrally formed with arc-shaped inserts that are inserted into the annular grooves. The inner walls of the arc-shaped inserts are integrally formed with inserts that are inserted into the slots. The two arc-shaped clamping plates are assembled to form a cylindrical structure. A spring sheet is fitted between the slot and the insert. The structure of the lower clamping assembly is the same as that of the upper clamping assembly.

[0007] Furthermore, the inner wall of the arc-shaped clamping plate is integrally formed with a retaining ring.

[0008] Furthermore, the lower surface of the fixed seat is provided with an upper mounting groove, the upper surface of the movable seat is provided with a lower mounting groove, the inner walls of the upper mounting groove and the lower mounting groove are provided with internal threads, and the outer surfaces of the two arc-shaped clamping plates are provided with external threads that match the internal threads.

[0009] Furthermore, a lower slot is provided in the middle of the upper surface of the movable seat, and an upper slot is provided in the middle of the lower surface of the fixed seat. A heating plate is inserted into both the lower and upper slots, and the heating plate is connected to an external power source through a wire.

[0010] Furthermore, the power assembly includes a motor, a drive wheel, and a transmission wheel. The motor is fixedly mounted on the upper surface of the top plate, and the drive wheel is fixedly mounted on the output end of the motor. A rectangular groove is provided on the upper surface of the fixed base, and the drive wheel is disposed in the rectangular groove. The outer wall of the drive wheel meshes with a transmission wheel, and the transmission wheel is assembled in the rectangular groove. The rotating inner core includes a driven wheel and a fixed tube. The driven wheel meshes with the transmission wheel and is assembled in a rectangular groove. A fixed tube is fixedly installed in the middle of the driven wheel, and the lower end of the fixed tube passes through the upper clamping assembly and is placed between the fixed seat and the movable seat. The upper end of the fixed tube is connected to an external pressure device.

[0011] Furthermore, guide vanes are uniformly fixedly installed on the outer wall of the fixed tube.

[0012] The beneficial effects of using this utility model are: This invention integrates a mechanical fatigue testing mechanism, a pressure testing function, and a temperature testing function into one unit. In addition to completing the above tests, it can also perform fatigue testing, pressure testing, and temperature testing on the bellows simultaneously in one test, and can realistically simulate the composite load conditions it bears in actual applications, greatly improving the completeness of the test and the realism of the working condition reproduction.

[0013] This invention features a rotating inner core that can disturb the medium inside the bellows, simulating the non-uniform, dynamically changing local pressure field generated by changes in flow direction, eddies, jets, etc. in actual fluid pipelines. This allows for a more realistic reproduction of the working state of the bellows in systems such as pumps, valves, and compressors, and effectively tests the reliability of the product in complex flow field environments.

[0014] This utility model is equipped with an upper clamping component and a lower clamping component, which facilitates the insertion and secure clamping of the bellows. The retaining ring can cooperate with the trough of the bellows to prevent axial movement. Combined with the optional sealing gasket, the reliability of the clamping seal is ensured. At the same time, the modular design also makes it easy to replace the clamping components of different specifications to adapt to the testing of bellows of different diameters, thus enhancing the versatility of the equipment. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 This is a three-dimensional schematic diagram of a partial structure of the present invention.

[0017] Figure 3 This is a three-dimensional schematic diagram of the fixing base of this utility model.

[0018] Figure 4 This is a three-dimensional schematic diagram of the movable seat of this utility model.

[0019] Figure 5 This is a three-dimensional schematic diagram of the clamping component of this utility model.

[0020] Figure 6 This is an exploded view of the clamping component of this utility model.

[0021] The reference numerals in the attached drawings include: 1. base plate, 11. guide post, 12. electric cylinder, 2. column, 3. top plate, 4. fixed seat, 41. upper mounting groove, 5. movable seat, 51. guide block, 52. lower slot, 53. heating plate, 6. upper clamping assembly, 61. circular plate, 611. annular groove, 612. slot, 62. arc-shaped clamping plate, 621. arc-shaped insert plate, 622. insert block, 623. retaining ring, 63. spring plate, 7. lower clamping assembly, 8. power assembly, 81. motor, 82. drive wheel, 83. transmission wheel, 9. rotating inner core, 91. driven wheel, 92. fixed tube, 93. guide vane. Detailed Implementation

[0022] 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.

[0023] Reference Figures 1 to 6 A pressure and temperature fatigue testing machine for welded corrugated pipes includes a base plate 1, columns 2 fixedly installed around the upper surface of the base plate 1, a top plate 3 fixedly installed at the upper end of the columns 2, a fixed seat 4 fixedly installed on the lower surface of the top plate 3, and a power assembly 8 assembled inside the fixed seat 4. The output end of the power assembly 8 is fixedly installed on a rotating inner core 9. An electric cylinder 12 is fixedly installed on the upper surface of the base plate 1, and a movable seat 5 is fixedly installed at the output end of the electric cylinder 12. An upper clamping assembly 6 is evenly fixedly installed on the lower surface of the fixed seat 4, and a lower clamping assembly 7 symmetrically distributed with the upper clamping assembly 6 is evenly fixedly installed on the upper surface of the movable seat 5. The two ends of the corrugated pipe are respectively fixed inside the upper clamping assembly 6 and the lower clamping assembly 7, and the rotating inner core 9 is located inside the corrugated pipe and connected to an external pressure device.

[0024] The two ends of the bellows are fixed to the upper clamping assembly 6 and the lower clamping assembly 7. The movable seat 5 is moved repeatedly by the electric cylinder 12 to perform fatigue testing on the bellows. The air pressure inside the bellows can be adjusted by rotating the inner core 9, thereby achieving pressure testing.

[0025] For electric cylinder 12, a hydraulic pump or other device that can provide repetitive linear motion can also be used.

[0026] Since the rotating inner core 9 is located inside the bellows, after the pressure is adjusted, the power component 8 can drive the rotating inner core 9 to rotate, thereby changing other flow directions and local pressures inside the bellows. This achieves a non-uniform, dynamic pressure distribution, which can simulate the phenomena of eddies, flow separation, and jet impacts generated by fluids due to pipe bends, valve opening and closing, and cross-sectional changes when the bellows is working in systems such as pumps, valves, compressors, and engine pipelines. This phenomenon will cause the pressure at different locations on the inner wall of the bellows to be instantaneously different and of varying magnitudes. Therefore, it can improve the fidelity and predictive ability of the test, and more accurately predict the reliability of the product in real-world environments.

[0027] Multiple bellows can be fixed simultaneously between the fixed seat 4 and the movable seat 5 to conduct synchronous experiments, thereby improving the efficiency and accuracy of the test.

[0028] Specifically, guide columns 11 are symmetrically fixed between the base plate 1 and the top plate 3, and guide blocks 51 are symmetrically fixed on the side wall of the movable seat 5. The outer wall of the guide block 51 is provided with a sliding groove, and the sliding groove is fitted onto the guide column 11.

[0029] The guide post 11 can assist in guiding the movement of the movable seat 5 and improve stability.

[0030] Specifically, the upper clamping assembly 6 includes a circular plate 61, an arc-shaped clamping plate 62, and a spring sheet 63. The side wall of the circular plate 61 is provided with an annular groove 611, and the inner wall of the annular groove 611 is symmetrically provided with slots 612. The inner walls of the two arc-shaped clamping plates 62 are integrally formed with arc-shaped inserts 621 that are inserted into the annular groove 611. The inner walls of the arc-shaped inserts 621 are integrally formed with inserts 622 that are inserted into the slots 612. The two arc-shaped clamping plates 62 are assembled to form a cylindrical structure. A spring sheet 63 is assembled between the slots 612 and the inserts 622. The structure of the lower clamping assembly 7 is the same as that of the upper clamping assembly 6. The inner wall of the arc-shaped clamping plate 62 is integrally formed with a retaining ring 623.

[0031] Specifically, the lower surface of the fixed seat 4 is provided with an upper mounting groove 41, the upper surface of the movable seat 5 is provided with a lower mounting groove, the inner walls of the upper mounting groove 41 and the lower mounting groove are provided with internal threads, and the outer surfaces of the two arc-shaped clamping plates 62 are provided with external threads that match the internal threads.

[0032] When the upper clamping assembly 6 is not installed in the upper mounting slot 41, the two arc-shaped clamping plates 62 will not fit tightly under the elastic force of the spring plate 63, and their slightly open state facilitates the insertion of the bellows; the retaining ring 623 matches the concave part of the bellows surface; when the upper clamping assembly 6 is screwed into the upper mounting slot 41, under the restriction of the upper mounting slot 41, the arc-shaped clamping plates 62 overcome the elastic force of the spring plate 63 and fit together, while clamping the bellows, and the design of the retaining ring 623 prevents the bellows from axial displacement, ensuring the stability of the fatigue test.

[0033] An annular sealing gasket is provided at the inner end of the retaining ring 623 to ensure the sealing performance when clamping the bellows, thereby improving the sealing performance and accuracy of the pressure test.

[0034] When testing bellows of different diameters is required, the upper clamping assembly 6 can be replaced with an upper clamping assembly 6 of different diameter inner cavities. At the same time, the position of the retaining ring 623 can be changed according to different bellows.

[0035] The lower clamping assembly 7 and the upper clamping assembly 6 have the same overall structure. The difference is that the circular plate 61 of the upper clamping assembly 6 has a through hole to allow the fixing tube 92 of the rotating inner core 9 to pass through, and it needs to be sealed. The circular plate of the lower clamping assembly 7 does not have a through hole.

[0036] Specifically, the upper surface of the movable seat 5 has a lower slot 52 in the middle, and the lower surface of the fixed seat 4 has an upper slot in the middle. Heating plates 53 are inserted into both the lower slot 52 and the upper slot, and the heating plates 53 are connected to an external power source through wires.

[0037] A plug is provided in the lower slot 52 and the upper slot, and a socket is provided at the plug-in point of the heating plate 53. The installation of the heating plate 53 completes the connection between the socket and the plug, thereby realizing the electrical connection. The heating plate 53 is provided with an electric heating wire, and the movable base 5 is provided with a wire connected to the plug and connected to an external power supply. After the heating plate 53 is installed, the switch can be turned on to generate heat and perform temperature testing on the corrugated pipes on both sides.

[0038] A temperature monitoring device is installed on the side wall of column 2 to monitor the temperature at the corrugated pipe. Based on the temperature feedback, the heating of heating plate 53 is adjusted in real time to ensure the stability of the corrugated pipe temperature and improve the accuracy of the test.

[0039] Specifically, the power assembly 8 includes a motor 81, a drive wheel 82, and a transmission wheel 83. The motor 81 is fixedly installed on the upper surface of the top plate 3. The drive wheel 82 is fixedly installed at the output end of the motor 81. A rectangular groove is opened on the upper surface of the fixed base 4, and the drive wheel 82 is set in the rectangular groove. The transmission wheel 83 is engaged with the outer wall of the drive wheel 82, and the transmission wheel 83 is assembled in the rectangular groove.

[0040] The rotating inner core 9 includes a driven wheel 91 and a fixed tube 92. The driven wheel 91 meshes with the transmission wheel 83 and is assembled in a rectangular groove. The fixed tube 92 is fixedly installed in the middle of the driven wheel 91. The lower end of the fixed tube 92 passes through the upper clamping assembly 6 and is placed between the fixed seat 4 and the movable seat 5. The upper end of the fixed tube 92 is connected to an external pressure device. Guide vanes 93 are uniformly fixedly installed on the outer wall of the fixed tube 92.

[0041] By adjusting the air pressure inside the bellows using an external pressure device and a fixed pipe 92, different application scenarios can be simulated, and pressure tests can be performed.

[0042] When the motor 81 is running, it can drive the drive wheel 82 to rotate, which in turn drives the transmission wheel 83 to rotate, and finally drives the driven wheel 91 and the guide vane 93 to rotate. The rotation of the guide vane 93 simulates the phenomenon of eddy currents, flow separation and jet impact generated by the fluid in the bellows in different systems, realizes dynamic pressure field simulation, and conducts real working condition simulation test.

[0043] For different simulation tests, the size and shape of each guide vane 93 can be adjusted, as can the speed of the motor 81.

[0044] This testing machine can perform fatigue, pressure, and temperature tests on bellows. During the test, adjustments can be made in multiple dimensions to complete the test of the bellows under different conditions. It can also simulate gas flow and pressure changes inside the bellows, further expanding the testing range of this equipment and providing more accurate test results.

[0045] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. A pressure and temperature fatigue testing machine for welded bellows, characterized in that: The device includes a base plate, on which columns are fixedly installed around the upper surface. A top plate is fixedly installed at the upper end of each column. A fixed seat is fixedly installed on the lower surface of the top plate, and a power assembly is assembled inside the fixed seat. The output end of the power assembly is fixedly installed on the rotating inner core. An electric cylinder is fixedly installed on the upper surface of the base plate, and a movable seat is fixedly installed at the output end of the electric cylinder. An upper clamping assembly is evenly fixedly installed on the lower surface of the fixed seat, and lower clamping assemblies symmetrically distributed with the upper clamping assembly are evenly fixedly installed on the upper surface of the movable seat. Both ends of the bellows are fixed inside the upper and lower clamping assemblies, respectively, and the rotating inner core is located inside the bellows. The rotating inner core is connected to an external pressure device.

2. The pressure and temperature fatigue testing machine for welded bellows according to claim 1, characterized in that: Guide columns are symmetrically fixedly installed between the bottom plate and the top plate, and guide blocks are symmetrically fixedly installed on the side wall of the movable seat. The outer wall of the guide block is provided with a sliding groove, and the sliding groove is fitted onto the guide column.

3. The pressure and temperature fatigue testing machine for welded bellows according to claim 1, characterized in that: The upper clamping assembly includes a circular plate, an arc-shaped clamping plate, and a spring sheet. The side wall of the circular plate has an annular groove, and the inner wall of the annular groove has symmetrical slots. The inner walls of the two arc-shaped clamping plates are integrally formed with arc-shaped inserts that are inserted into the annular grooves. The inner walls of the arc-shaped inserts are integrally formed with inserts that are inserted into the slots. The two arc-shaped clamping plates are assembled to form a cylindrical structure. A spring sheet is fitted between the slot and the insert. The structure of the lower clamping assembly is the same as that of the upper clamping assembly.

4. The pressure and temperature fatigue testing machine for welded bellows according to claim 3, characterized in that: The inner wall of the arc-shaped clamping plate is integrally formed with a retaining ring.

5. The pressure and temperature fatigue testing machine for welded bellows according to claim 4, characterized in that: The lower surface of the fixed seat is provided with an upper mounting groove, and the upper surface of the movable seat is provided with a lower mounting groove. The inner walls of both the upper and lower mounting grooves are provided with internal threads, and the outer surfaces of the two arc-shaped clamping plates are provided with external threads that match the internal threads.

6. The pressure and temperature fatigue testing machine for welded bellows according to claim 1, characterized in that: The movable seat has a lower slot in the middle of its upper surface, and the fixed seat has an upper slot in the middle of its lower surface. A heating plate is inserted into both the lower and upper slots, and the heating plate is connected to an external power source via a wire.

7. The pressure and temperature fatigue testing machine for welded bellows according to claim 1, characterized in that: The power assembly includes a motor, a drive wheel, and a transmission wheel. The motor is fixedly mounted on the upper surface of the top plate. The output end of the motor is fixedly mounted with the drive wheel. A rectangular groove is opened on the upper surface of the fixed base, and the drive wheel is disposed in the rectangular groove. The outer wall of the drive wheel meshes with the transmission wheel, and the transmission wheel is assembled in the rectangular groove. The rotating inner core includes a driven wheel and a fixed tube. The driven wheel meshes with the transmission wheel and is assembled in a rectangular groove. A fixed tube is fixedly installed in the middle of the driven wheel, and the lower end of the fixed tube passes through the upper clamping assembly and is placed between the fixed seat and the movable seat. The upper end of the fixed tube is connected to an external pressure device.

8. The pressure and temperature fatigue testing machine for welded bellows according to claim 7, characterized in that: Guide vanes are uniformly fixedly installed on the outer wall of the fixed tube.

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