Mechanical seal static test air tightness experimental device

Abstract

The utility model relates to the technical field of experimental devices, and discloses a mechanical seal static test air tightness experimental device which comprises a workbench, a cavity assembly is arranged on the workbench and comprises an airtight cylinder bottom plate, a mandrel is arranged on the airtight cylinder bottom plate, a variable-diameter shaft sleeve is arranged at the top of the mandrel, and the variable-diameter shaft sleeve is connected with the airtight cylinder bottom plate. A cylinder body is arranged at the top of the airtight cylinder bottom plate, a positioning disc and a variable-diameter disc are arranged at the top of the cylinder body, and a plum nut is arranged at the top of the variable-diameter shaft sleeve; according to the utility model, the high-precision sensor is utilized, tiny pressure drop can be detected, errors caused by human subjective judgment are avoided, the reliability of a detection result is improved, the control unit is matched, the functions of data automatic detection, one-key start and automatic stop are realized, the whole process of manual detection is replaced, not only is the detection efficiency improved, but also the detection cost is reduced. And the labor cost is reduced, and the influence of human factors on the detection result is reduced.

Description

Technical Field

[0001] This utility model relates to the field of experimental device technology, specifically to an experimental device for static testing of the airtightness of mechanical seals. Background Technology

[0002] With the development of the times, the testing requirements for mechanical seals are constantly changing, and traditional static pressure tests have gradually exposed many problems. On the one hand, labor costs are high. The entire testing process, from installation to testing to disassembly, requires a large amount of manpower, which consumes a lot of labor costs. On the other hand, data errors are large. In the past, visual observation was the main method, and the results of this testing method are subjective and difficult to accurately judge the airtightness of mechanical seals. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a mechanical seal static test airtightness test device to address the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a mechanical seal static test airtightness experimental device, including a workbench, a cavity assembly on the workbench, the cavity assembly including an airtight cylinder base plate, a mandrel on the airtight cylinder base plate, a variable diameter bushing on the top of the mandrel, a cylinder body on the top of the airtight cylinder base plate, a positioning plate and a variable diameter plate on the top of the cylinder body, a plum nut on the top of the variable diameter bushing, a bushing sleeve on the outer wall of the variable diameter bushing, a mechanical seal on the outer wall of the bushing, a pressure ring on the top of the mechanical seal, a solenoid valve one, a solenoid valve two and a pressure transmitter on the bottom of the cavity assembly, and a control unit inside the workbench.

[0005] Preferably, the airtight cylinder base plate is fixedly installed to the mandrel by a first hexagonal screw and to the cylinder body by a second hexagonal screw, the positioning plate is fixedly installed to the cylinder body by a third hexagonal screw, and a quick-connect plug is provided at the bottom of the airtight cylinder base plate.

[0006] Preferably, a sealing gasket is provided between the cylinder body and the airtight cylinder bottom plate, and a washer is provided at the bottom of the plum nut.

[0007] Preferably, a quick-pressing plate is fixedly installed on the top of the workbench, a pressing assembly is provided on the quick-pressing plate, and a plug is provided at the bottom of the pressing ring.

[0008] Preferably, an air inlet is provided on one side of the solenoid valve, and a drain outlet is provided at the bottom of the air inlet.

[0009] Preferably, the front of the workbench is provided with a display and control buttons.

[0010] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0011] 1. This static airtightness testing device for mechanical seals utilizes high-precision sensors to detect minute pressure drops. It calculates the leakage rate based on an approximate leakage formula and assesses sealing performance using international standards. This ensures accurate and objective data that conforms to international standards, avoiding errors caused by subjective human judgment and improving the reliability of test results. The use of quick-release plates instead of bolts for mechanical seal installation significantly reduces installation time and labor intensity, enabling rapid installation and making the testing process more convenient and efficient. Combined with a control unit, it achieves automatic data detection, one-button start, and automatic stop functions, replacing the entire manual testing process. This not only improves testing efficiency but also reduces labor costs and minimizes the impact of human factors on test results.

[0012] 2. This mechanical seal static air tightness test device, by using a standard sealing cavity, can test different single-end face cartridge mechanical seals as long as it is equipped with a connecting flange and a bushing, reducing the time and cost of making a large number of tooling and improving the versatility of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 This is a cross-sectional view of the cavity assembly of this utility model;

[0016] Figure 4 This is a top view of the quick-pressing plate of this utility model.

[0017] In the diagram: 1. Airtight cylinder base plate; 2. Mandrel; 3. Variable diameter bushing; 4. Socket head screw one; 5. Quick connector; 6. Socket head screw two; 7. Sealing gasket; 8. Cylinder body; 9. Socket head screw three; 10. Positioning plate; 11. Variable diameter plate; 12. Washer; 13. Torx nut; 14. Clamping assembly; 15. Bushing; 16. Mechanical seal; 17. Pressure ring; 18. Plug; 19. Solenoid valve one; 20. Solenoid valve two; 21. Pressure transmitter; 22. Air inlet; 23. Drain outlet; 24. Quick-release plate. Detailed Implementation

[0018] 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.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0022] Please see Figure 1-4One embodiment of this utility model is: a mechanical seal static airtightness test device, including a workbench, a cavity assembly on the workbench, the cavity assembly including an airtight cylinder base plate 1, a mandrel 2 on the airtight cylinder base plate 1, a variable diameter bushing 3 on the top of the mandrel 2, a cylinder body 8 on the top of the airtight cylinder base plate 1, a positioning plate 10 and a variable diameter plate 11 on the top of the cylinder body 8, a plum nut 13 on the top of the variable diameter bushing 3, a sealing ring 1 between the mandrel 2 and the airtight cylinder base plate 1, a sealing ring 2 inside the variable diameter bushing 3, a sealing ring 3 between the positioning plate 10 and the variable diameter plate 11, a sealing ring 4 between the positioning plate 10 and the cylinder body 8, and a sealing ring 4 on the outer wall of the variable diameter bushing 3. A bushing 15 is fitted with a mechanical seal 16 on its outer wall. A pressure ring 17 is provided on the top of the mechanical seal 16. A solenoid valve 19, a solenoid valve 20, and a pressure transmitter 21 are provided at the bottom of the cavity assembly. A control unit is provided inside the worktable. A quick-pressing plate 24 is fixedly installed on the top of the worktable. A clamping assembly 14 is provided on the quick-pressing plate 24. There are four sets of quick-pressing plates 24 and clamping assemblies 14, arranged in a circumferential array. The quick-pressing plate 24 is fixed to the top of the worktable by bolts. A plug 18 is provided at the bottom of the pressure ring 17. An air inlet 22 is provided on one side of the solenoid valve 19. A drain outlet 23 is provided at the bottom of the air inlet 22. A display and control buttons are provided on the front of the worktable.

[0023] Working principle: By installing the bushing 15 on the cavity assembly, the mechanical seal 16 is installed on the cavity assembly through the connecting flange. The mechanical seal 16 is pressed by the clamping assembly on the quick-pressing plate 24 and the pressure ring 17. After the mechanical seal 16 is installed, a 28-liter sealed cavity is formed between the cavity assembly, the mechanical seal 16 and the bushing 15. By closing the second solenoid valve 20 and opening the first solenoid valve 19, 0.17 MPa air is introduced from the air inlet 22. The signal is transmitted to the control unit through the pressure transmitter 21. When the pressure in the sealed cavity reaches 0.17 MPa, the first solenoid valve 19 is closed. At this time, the system starts timing. After 5 minutes, the control unit emits a prompt sound. Observe the display and calculate the leakage amount based on whether the pressure drop is within the range, using the formula Q=V×P1 / T×P0 (V is the volume of the tested object, P1 is the pressure difference during detection, T is the detection time, and P0 is atmospheric pressure) to determine whether the mechanical seal is leaking. The international standard API 682:2004 specifies a test volume of 28L, a test pressure of 0.17MPa, a test time of ≥5min, and a maximum pressure drop of 0.14MPa. Finally, press the end button, solenoid valve 20 opens, the sealed chamber vents through drain port 23, and the quick-release plate 24 is released, completing the test.

[0024] Please see Figure 1-4Based on the above embodiments, in another embodiment of the present invention, the airtight cylinder base plate 1 is fixedly installed to the spindle 2 by a hexagonal screw 4 and to the cylinder body 8 by a hexagonal screw 6. The positioning plate 10 is fixedly installed to the cylinder body 8 by a hexagonal screw 9. A quick-connect plug 5 is provided at the bottom of the airtight cylinder base plate 1. A sealing gasket 7 is provided between the cylinder body 8 and the airtight cylinder base plate 1. A washer 12 is provided at the bottom of the plum nut 13.

[0025] Working principle: The spindle 2 and the airtight cylinder base plate 1 can be firmly installed by setting the hex socket screw 4; the positioning plate 10 and the cylinder body 8 can be firmly installed by setting the hex socket screw 3 9; and the installation strength of the Torx nut 13 can be improved by setting the washer 12.

[0026] It is worth noting that all the technologies not described in the above manual are existing technologies and are not the main innovations, so they will not be described in detail here.

[0027] This utility model provides an experimental device for static testing of the airtightness of mechanical seals. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A mechanical seal static test air tightness experimental device, comprising a workbench, characterized in that: The workbench is provided with a cavity assembly, the cavity assembly comprises an airtight cylinder bottom plate (1), the airtight cylinder bottom plate (1) is provided with a mandrel (2), the top of the mandrel (2) is provided with a variable-diameter shaft sleeve (3), the top of the airtight cylinder bottom plate (1) is provided with a cylinder (8), the top of the cylinder (8) is provided with a positioning disc (10) and a variable-diameter disc (11), the top of the variable-diameter shaft sleeve (3) is provided with a key nut (13), the outer wall of the variable-diameter shaft sleeve (3) is provided with a shaft sleeve (15), the outer wall of the shaft sleeve (15) is provided with a mechanical seal (16), the top of the mechanical seal (16) is provided with a compression ring (17), the bottom of the cavity assembly is provided with a solenoid valve one (19), a solenoid valve two (20) and a pressure transmitter (21), the inside of the workbench is provided with a control unit.

2. The mechanical seal static test air tightness experimental device according to claim 1, characterized in that: The airtight cylinder bottom plate (1) is fixedly installed with the mandrel (2) through the inner hexagonal screw one (4) and is fixedly installed with the cylinder (8) through the inner hexagonal screw two (6), the positioning disc (10) is fixedly installed with the cylinder (8) through the inner hexagonal screw three (9), and the bottom of the airtight cylinder bottom plate (1) is provided with a quick connector (5).

3. The mechanical seal static test air tightness experimental device according to claim 2, characterized in that: The cylinder (8) and the airtight cylinder bottom plate (1) are provided with a sealing gasket (7), and the bottom of the key nut (13) is provided with a gasket (12).

4. The mechanical seal static test air tightness experimental device according to claim 1, characterized in that: The top of the workbench is fixedly installed with a quick pressing plate (24), the quick pressing plate (24) is provided with a pressing assembly (14), and the bottom of the compression ring (17) is provided with a plug (18).

5. The mechanical seal static test air tightness experimental device according to claim 1, characterized in that: One side of the solenoid valve one (19) is provided with an air inlet (22), and the bottom of the air inlet (22) is provided with a drain (23).

6. The mechanical seal static test air tightness experimental device according to claim 1, characterized in that: The front of the workbench is provided with a display and control buttons. The top of the workbench is fixedly installed with a quick pressing plate (24), the quick pressing plate (24) is provided with a pressing assembly (14), and the bottom of the compression ring (17) is provided with a plug (18).

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