Gasket sealing performance testing device

Abstract

A gasket sealing performance testing device disclosed by the present invention comprises a machine body, a nitrogen cylinder and a central control and data processing system, a lower pressure head module is internally provided with a first refrigeration system and a first heating system, and the contact surface of an upper pressure head module is provided with a contact stress distribution sensing array. A pressurizing air port is formed in the center of the lower pressing head module, and a second refrigerating system and a second heating system are arranged in the lower pressing head module. A nitrogen cylinder is connected with a pressurizing gas port of a lower pressure head module through a high-pressure gas pipe, a pressure reducing valve, a pressure gauge and an electromagnetic valve on a pipeline can accurately adjust and stably control the pressure of nitrogen introduced into a gasket sealing cavity, and a central control and data processing system integrates a PLC, a data acquisition card and a temperature control module. According to the invention, the automatic control and data acquisition and analysis of the whole test process are realized, and the convenience and accuracy of the test are improved.

Description

A gasket sealing performance testing device Technical Field

[0001] This invention relates to the field of material mechanical property testing and sealing technology, and particularly to a gasket sealing performance testing device. Background Technology

[0002] Gaskets are crucial static sealing elements in industrial equipment and piping systems, and their performance directly affects the system's sealing reliability, safety, and energy consumption. The compression-rebound characteristics of a gasket are one of its core performance indicators: compression characteristics determine whether it can fill the microscopic unevenness of the flange surface during initial assembly, forming an effective initial seal; rebound characteristics determine whether it can compensate for minor changes in the sealing gap under conditions such as system pressure fluctuations, temperature changes, or bolt stress relaxation, maintaining long-term sealing stability.

[0003] Existing testing equipment is mostly single-function or has a limited parameter range. Existing technology has the following defects: limited temperature environment: most tests are only conducted at room temperature, which cannot simulate the high or low temperature environments that the gasket may experience in actual working conditions, resulting in a significant deviation between the test data and the actual performance.

[0004] Typically, only loads and displacements are recorded, lacking synchronous and accurate monitoring methods for the evolution of gasket contact stress distribution, temperature field uniformity, and potential leakage at the sealing interface during the test. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a gasket sealing performance testing device.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A gasket sealing performance testing device of the present invention includes a body, a nitrogen cylinder, and a central control and data processing system. A support platform is provided at the top center of the body, and a pressing head module is provided at the top center of the support platform. A first refrigeration system and a first heating system are provided inside the pressing head module. Guide rails are provided on both sides of the pressing head module. Support columns are provided around the support platform, a top plate is provided at the top of the support columns, and a connecting plate is provided at the bottom of the top plate. A [missing information - likely a design feature] is provided at the bottom center of the connecting plate. The device includes an upper pressure head module with a contact stress distribution sensor array on its contact surface, a lower pressure head module with a central pressurization port, a second refrigeration system, a second heating system, and micro-leakage monitoring modules for monitoring gasket sealing interface leakage on its surrounding surfaces. The connecting plate has sliding grooves on both sides that are slidably connected to a guide rail. A driving device is mounted at the top center of the top plate, which moves the connecting plate and the upper pressure head module up and down along the guide rail to compress and load the gasket.

[0007] As a preferred embodiment of the present invention, a grating ruler is provided on the inner side of the guide rail, and a reading head is provided on the top side of the sliding groove. The reading head cooperates with the grating ruler to accurately measure the displacement of the upper pressure head module in the vertical direction in real time.

[0008] As a preferred embodiment of the present invention, the nitrogen cylinder is connected to the pressurization port of the lower pressure head module through a high-pressure gas pipe. The high-pressure gas pipe is equipped with a pressure reducing valve, a pressure gauge and a solenoid valve in sequence, which can accurately adjust and stably control the nitrogen pressure entering the gasket sealing cavity. The pressure adjustment range is 0-10MPa and the pressure control accuracy is ±0.01MPa.

[0009] As a preferred embodiment of the present invention, the first refrigeration system and the second refrigeration system have the same structure, both including a semiconductor cooling chip, a heat sink and a cooling fan. The first heating system and the second heating system both include heating wires, which are evenly distributed in a spiral shape inside the pressure head module. A temperature sensor is provided on one side of both the first refrigeration system and the second refrigeration system. The temperature sensor is embedded in the contact surface of the pressure head module and can monitor the actual temperature of the pressure head in real time.

[0010] As a preferred technical solution of the present invention, the micro-leakage monitoring module includes a micro gas sensor array disposed on the edge of the contact surface of the pressure head module. The array consists of multiple high-sensitivity helium sensors with a minimum detection limit of 1×10-9 Pa·m3 / s, which can capture the micro-leakage signal generated by the gasket sealing interface and transmit the leakage data to the central control and data processing system in real time.

[0011] As a preferred technical solution of the present invention, the contact stress distribution sensing array is composed of flexible thin film pressure sensors, which are arranged in a matrix to cover the entire contact surface of the pressure head module. The spatial resolution of the sensor is 0.5mm×0.5mm, which can collect the stress values ​​of each point on the gasket sealing contact surface in real time. The two-dimensional stress distribution cloud map is formed by the central control and data processing system, which intuitively reflects the uniformity of stress distribution of the gasket during the compression process.

[0012] As a preferred embodiment of the present invention, the central control and data processing system includes a touch screen and control buttons, and integrates a PLC controller, a data acquisition card and a temperature control module. The PLC controller is electrically connected to the drive device, solenoid valve, grating ruler, contact stress distribution sensor array, micro-leakage monitoring module, first refrigeration system and second refrigeration system, first heating system and second heating system, respectively, which can realize automated control and data acquisition and analysis of the entire testing process.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1: By integrating a first cooling system, a second cooling system, a first heating system, and a second heating system inside the pressure head module, and combining them with a temperature sensor embedded in the contact surface of the pressure head, the present invention can accurately control the temperature of the gasket test environment, effectively simulate the high temperature or low temperature environment that the gasket may encounter in actual working conditions, make up for the deficiency of the single temperature environment of the existing equipment, and make the test data closer to the real performance.

[0014] 2. This invention sets a contact stress distribution sensing array on the contact surface of the upper pressure head module. This array is composed of a matrix of flexible thin-film pressure sensors with a spatial resolution of 0.5mm×0.5mm. It can collect stress values ​​at each point on the gasket sealing contact surface in real time and form a two-dimensional stress distribution cloud map through a central control and data processing system, which intuitively reflects the uniformity of stress distribution during the gasket compression process. At the same time, a micro-leakage monitoring module is set on the four sides of the lower pressure head module. Its micro gas sensor array is composed of multiple high-sensitivity helium sensors, which can capture micro-leakage signals and realize synchronous and accurate monitoring of key parameters such as contact stress distribution and leakage status.

[0015] 3. This invention uses a drive device to move the upper pressure head module up and down along the guide rail to achieve compression loading. The grating ruler on the inner side of the guide rail cooperates with the reading head on the top side of the sliding groove to accurately measure the vertical displacement of the upper pressure head module in real time. The nitrogen cylinder is connected to the pressurization port of the lower pressure head module through a high-pressure gas pipe. The pressure reducing valve, pressure gauge and solenoid valve on the pipeline can accurately adjust and stably control the nitrogen pressure entering the gasket sealing cavity. The central control and data processing system integrates a PLC controller, data acquisition card and temperature control module, and is electrically connected to each component, realizing the automated control and data acquisition and analysis of the entire testing process, improving the convenience and accuracy of the test. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the accompanying drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the planar structure of the lower pressure head module and the upper pressure head module of the present invention; Figure 3 is a schematic diagram of a partial structure of the body of the present invention; Figure 4 is a block diagram of the present invention; In the figures: 1, body; 2, nitrogen cylinder; 3, central control and data processing system; 4, support platform; 5, lower pressure head module; 6, first refrigeration system; 7, first heating system; 8, guide rail; 81, grating ruler; 9, support column; 10, top plate; 11, connecting plate; 12, upper pressure head module; 13, contact stress distribution sensor array; 14, pressurization port; 15, second refrigeration system; 16, second heating system; 17, micro-leakage monitoring module; 18, sliding groove; 181, reading head; 19, driving device; 21, high-pressure gas pipe; 22, pressure reducing valve; 23, pressure gauge; 24, solenoid valve; 25, semiconductor refrigeration chip; 26, heat sink; 27, cooling fan; 28, heating wire; 29, temperature sensor. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Example 1, as shown in Figures 1-4, provides a gasket sealing performance testing device, including a body 1, a nitrogen cylinder 2, and a central control and data processing system 3. A support platform 4 is located at the top center of the body 1. A lower pressure head module 5 is located at the top center of the support platform 4. The lower pressure head module 5 contains a first refrigeration system 6 and a first heating system 7. Guide rails 8 are located on both sides of the lower pressure head module 5. Support columns 9 are located around the support platform 4. A top plate 10 is located on the top of the support columns 9. A connecting plate 11 is located at the bottom of the top plate 10. An upper pressure head module 12 is located at the bottom center of the connecting plate 11. The contact surface of the pressure head module 12 is provided with a contact stress distribution sensor array 13. The center of the lower pressure head module 5 is provided with a pressurization port 14. The interior of the lower pressure head module 5 is provided with a second refrigeration system 15 and a second heating system 16. The four sides of the lower pressure head module 5 are provided with micro-leakage monitoring modules 17 for monitoring leakage at the gasket sealing interface. The two sides of the connecting plate 11 are provided with sliding grooves 18, which are slidably connected to the guide rail 8. The top center of the top plate 10 is equipped with a driving device 19, which drives the connecting plate 11 and the upper pressure head module 12 to move up and down along the guide rail 8 to compress and load the gasket.

[0019] Furthermore, a grating ruler 81 is provided on the inner side of the guide rail 8, and a reading head 181 is provided on the top side of the sliding groove 18. The reading head 181 cooperates with the grating ruler 81 to accurately measure the displacement of the upper pressure head module 12 in the vertical direction in real time.

[0020] Nitrogen cylinder 2 is connected to the pressurization port 14 of the lower pressure head module 5 via high-pressure gas pipe 21. The high-pressure gas pipe 21 is equipped with a pressure reducing valve 22, a pressure gauge 23 and a solenoid valve 24 in sequence, which can accurately adjust and stably control the nitrogen pressure entering the gasket sealing cavity. The pressure adjustment range is 0-10MPa and the pressure control accuracy is ±0.01MPa.

[0021] The first cooling system 6 and the second cooling system 15 have the same structure, both including a semiconductor cooling chip 25, a heat sink 26 and a cooling fan 27. The first heating system 7 and the second heating system 16 both include a heating wire 28, which is evenly distributed in a spiral shape inside the pressure head module. A temperature sensor 29 is provided on one side of both the first cooling system 6 and the second cooling system 15. The temperature sensor 29 is embedded in the contact surface of the pressure head module and can monitor the actual temperature of the pressure head in real time.

[0022] The micro-leakage monitoring module 17 includes a miniature gas sensor array located at the edge of the contact surface of the pressure head module 5. The array consists of multiple high-sensitivity helium sensors with a minimum detection limit of 1×10-9 Pa·m3 / s. It can capture minute leakage signals generated at the gasket sealing interface and transmit the leakage data to the central control and data processing system in real time.

[0023] The contact stress distribution sensing array 13 is composed of flexible thin-film pressure sensors, which are arranged in a matrix to cover the entire contact surface of the pressure head module. The spatial resolution of the sensors is 0.5mm×0.5mm, which can collect the stress values ​​of each point on the gasket sealing contact surface in real time. The central control and data processing system 3 forms a two-dimensional stress distribution cloud map, which intuitively reflects the uniformity of stress distribution of the gasket during the compression process.

[0024] The central control and data processing system 3 includes a touch screen and control buttons, and integrates a PLC controller, a data acquisition card and a temperature control module. The PLC controller is electrically connected to the drive device 19, solenoid valve 24, grating ruler 81, contact stress distribution sensor array 13, micro-leakage monitoring module 17, first refrigeration system 6 and second refrigeration system 15, first heating system 7 and second heating system 16, respectively, which can realize the automated control and data acquisition and analysis of the entire testing process.

[0025] Specifically, during testing, the gasket to be tested is placed on the contact surface of the lower pressure head module 5. Test parameters such as compression displacement, temperature, and gas pressure are set through the central control and data processing system 3. The drive device 19 is activated, which moves the connecting plate 11 and the upper pressure head module 12 downwards along the guide rail 8, applying a compressive load to the gasket. During this process, the grating ruler 81 and the reading head 181 work together to accurately measure the vertical displacement of the upper pressure head module 12 in real time. This displacement data is fed back to the central control and data processing system 3 for calculating the compression of the gasket. Simultaneously, the contact stress distribution sensor array 13 on the contact surface of the upper pressure head module 12 collects stress values ​​at various points on the gasket contact surface in real time with a spatial resolution of 0.5mm × 0.5mm, and transmits the data to the central control and data processing system 3. The system then generates a two-dimensional stress distribution cloud map, visually displaying the stress distribution of the gasket during compression and helping to analyze the uniformity of stress on the gasket.

[0026] Once the gasket is compressed to the set displacement, the first heating system 7 and the second heating system 16 begin operation, with the spirally distributed heating wires 28 heating the upper and lower pressure head modules. To simulate a low-temperature environment, the first cooling system 6 and the second cooling system 15 are activated, and the semiconductor cooling chip 25 cools the gasket through heat exchange via the heat sink 26 and cooling fan 27. A temperature sensor 29 is embedded in the contact surface of the pressure head module, monitoring and feeding back the actual pressure head temperature to the central control and data processing system 3 in real time. The temperature control module then adjusts the heating or cooling system to ensure the pressure head temperature remains stable at the set value, thereby simulating the sealing performance of the gasket under different temperature conditions.

[0027] Subsequently, nitrogen from nitrogen cylinder 2 is introduced through high-pressure gas pipe 21, precisely regulated to the set pressure by pressure reducing valve 22, displayed by pressure gauge 23 and controlled by solenoid valve 24, and then introduced into pressurization port 14 in the center of lower pressure head module 5, entering the sealed cavity formed by the upper and lower pressure head modules and the gasket. At this time, the micro-leakage monitoring module 17 at the edge of the contact surface of lower pressure head module 5 starts to work. Its micro gas sensor array monitors in real time whether there is a trace gas leak at the gasket sealing interface, with a minimum detection limit of 1×10-9 Pa·m3 / s. After the leakage signal is captured, it is transmitted to the central control and data processing system 3 in real time. The system analyzes and processes the data, and combines it with parameters such as pressure, temperature, displacement, and stress distribution to comprehensively evaluate the sealing performance of the gasket. Throughout the test, the central control and data processing system 3 realizes automated control of each component through PLC controller, and completes the acquisition, storage, and analysis of all test data through data acquisition card. Finally, a test report is generated, providing a scientific basis for gasket quality assessment and performance improvement.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gasket sealing performance testing device, comprising a main body (1), a nitrogen cylinder (2), and a central control and data processing system (3), characterized in that, A support platform (4) is provided at the top center of the body (1). A lower pressure head module (5) is provided at the top center of the support platform (4). A first refrigeration system (6) and a first heating system (7) are provided inside the lower pressure head module (5). Guide rails (8) are provided on both sides of the lower pressure head module (5). Support columns (9) are provided around the support platform (4). A top plate (10) is provided on the top of the support columns (9). A connecting plate (11) is provided at the bottom of the top plate (10). An upper pressure head module (12) is provided at the bottom center of the connecting plate (11). A contact stress distribution sensing array (12) is provided on the contact surface of the upper pressure head module (12). 3) A pressurizing port (14) is provided in the center of the lower pressure head module (5). A second refrigeration system (15) and a second heating system (16) are provided inside the lower pressure head module (5). A micro-leakage monitoring module (17) for monitoring leakage at the gasket sealing interface is provided on the four sides of the lower pressure head module (5). Sliding grooves (18) are provided on both sides of the connecting plate (11). The sliding grooves (18) are slidably connected to the guide rail (8). A driving device (19) is installed in the center of the top of the top plate (10). The driving device (19) drives the connecting plate (11) and the upper pressure head module (12) to move up and down along the guide rail (8) to compress and load the gasket.

2. The gasket sealing performance testing device according to claim 1, characterized in that, The inner side of the guide rail (8) is provided with a grating ruler (81), and the top side of the sliding groove (18) is provided with a reading head (181). The reading head (181) cooperates with the grating ruler (81) to accurately measure the displacement of the upper pressure head module (12) in the vertical direction in real time.

3. The gasket sealing performance testing device according to claim 1, characterized in that, The nitrogen cylinder (2) is connected to the pressurization port (14) of the lower pressure head module (5) through a high-pressure gas pipe (21). The high-pressure gas pipe (21) is equipped with a pressure reducing valve (22), a pressure gauge (23) and a solenoid valve (24) in sequence, which can accurately adjust and stably control the nitrogen pressure entering the gasket sealing cavity. The pressure adjustment range is 0-10MPa and the pressure control accuracy is ±0.01MPa.

4. The gasket sealing performance testing device according to claim 1, characterized in that, The first refrigeration system (6) and the second refrigeration system (15) have the same structure, both including a semiconductor cooling chip (25), a heat sink (26) and a cooling fan (27). The first heating system (7) and the second heating system (16) both include a heating wire (28). The heating wire (28) is evenly distributed in a spiral shape inside the pressure head module. A temperature sensor (29) is provided on one side of both the first refrigeration system (6) and the second refrigeration system (15). The temperature sensor (29) is embedded in the contact surface of the pressure head module and can monitor the actual temperature of the pressure head in real time.

5. The gasket sealing performance testing device according to claim 1, characterized in that, The micro-leakage monitoring module (17) includes a micro gas sensor array located at the edge of the contact surface of the pressure head module (5). The array consists of multiple high-sensitivity helium sensors with a minimum detection limit of 1×10-9 Pa·m3 / s. It can capture the micro-leakage signal generated at the gasket sealing interface and transmit the leakage data to the central control and data processing system in real time.

6. The gasket sealing performance testing device according to claim 1, characterized in that, The contact stress distribution sensing array (13) is composed of flexible thin film pressure sensors. It covers the entire contact surface of the pressure head module in a matrix arrangement. The spatial resolution of the sensor is 0.5mm×0.5mm. It can collect the stress values ​​of each point on the gasket sealing contact surface in real time. The central control and data processing system (3) forms a two-dimensional stress distribution cloud map, which intuitively reflects the uniformity of stress distribution of the gasket during the compression process.

7. The gasket sealing performance testing device according to claim 1, characterized in that, The central control and data processing system (3) includes a touch screen and control buttons. It integrates a PLC controller, a data acquisition card and a temperature control module. The PLC controller is electrically connected to the drive device (19), solenoid valve (24), grating ruler (81), contact stress distribution sensor array (13), micro-leakage monitoring module (17), first refrigeration system (6) and second refrigeration system (15), first heating system (7) and second heating system (16), respectively, which can realize the automated control and data acquisition and analysis of the entire test process.

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