A dynamic seal testing device

Abstract

The utility model discloses a kind of dynamic sealing test device, including helium mass spectroscopy leak detector and be set on the rotating drive mechanism of helium mass spectroscopy leak detector rack, rotating drive mechanism includes support, drive assembly, transmission assembly and output end;The utility model is driven by the rotating drive mechanism set, dynamic sealing simulates its actual continuous rotation working condition in ring network cabinet, solve the problem that existing static detection mode is disjointed with dynamic sealing dynamic condition, realize the real, accurate evaluation of dynamic sealing dynamic sealing performance, ensure that detection result can effectively reflect its actual operation time's sealing reliability;Meanwhile, by adjustable telescopic link structure and replaceable output end, the adaptability of device to different specifications dynamic sealing is improved, the versatility and convenience of detection are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of sealing testing equipment technology, specifically a dynamic sealing testing device. Background Technology

[0002] Dynamic seals are sealing structures between relatively moving parts in substation ring main units. Their core function is to prevent leakage of internal insulating gases such as SF6, while also blocking the intrusion of outdoor dust, rain, snow, and other impurities when the parts are in motion. Therefore, the airtightness of dynamic seals has stringent requirements, and airtightness testing is necessary before use. Airtightness testing of dynamic seals generally uses a helium mass spectrometer leak detector. Helium is sprayed onto the exterior of the dynamic seal under test. If a leak is present, helium will overflow from the leak hole and be drawn into the leak detector's intake system. The helium is ionized into helium ions in the ion source, which then enter the mass analyzer for screening. The detector receives the helium ions and converts them into an electrical signal. The instrument determines the extent of the leak based on the signal strength, and the final result is fed back through instruments or alarm devices.

[0003] In existing technologies, helium mass spectrometry leak detection of dynamic seals mostly adopts a static detection mode: the part to be tested is directly fixed to the leak detector fixture, and the air tightness test is completed in a completely static state; however, when the dynamic seal is actually running in the ring main unit, it is always in a continuously rotating working state. This detection state is out of touch with the actual working conditions, so the test results in the static state cannot truly reflect its sealing performance when it is working dynamically. Utility Model Content

[0004] The purpose of this invention is to provide a dynamic sealing test device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A dynamic seal testing device includes a helium mass spectrometer leak detector and a rotary drive mechanism mounted on the frame of the helium mass spectrometer leak detector. The rotary drive mechanism includes a support, a drive assembly, a transmission assembly, and an output end.

[0006] As a further embodiment of this utility model: the bracket serves as the mounting base for the rotary drive mechanism and is integrally bent into a Z-shaped structure, including upper and lower horizontal sections and a vertical section connecting the two horizontal sections. A rectangular bracket fixing plate is provided at the end of the lower horizontal section. The bracket fixing plate is positioned opposite to the end of the lower horizontal section, and coaxial mounting holes are provided at corresponding positions. Bolts can pass through the mounting holes at the end of the lower horizontal section and the bracket fixing plate in sequence, and can be detachably connected to the frame of the helium mass spectrometer leak detector.

[0007] As a further embodiment of this utility model: the drive assembly includes a motor and a motor mounting base, the upper horizontal section of the bracket is a motor mounting platform, and the motor is fixedly connected to the motor through the motor mounting base.

[0008] As a further embodiment of this utility model: the transmission assembly includes an auxiliary shaft, a bearing, a universal joint, a first telescopic rod, and a second telescopic rod. The auxiliary shaft is fixedly connected to the output shaft of the motor via a coupling, and the middle part of the auxiliary shaft is inserted into the bearing to achieve stable rotation. The outer ring of the bearing is interference-fitted with the mounting hole of the bracket, and the inner ring is transition-fitted with the auxiliary shaft. The end of the auxiliary shaft away from the motor is fixedly connected to the input end of the universal joint, and the output end of the universal joint is fixedly connected to one end of the first telescopic rod. The first telescopic rod is a hollow steel pipe, and its end away from the universal joint is sleeved onto one end of the second telescopic rod and fixedly connected by a positioning pin. The other end of the second telescopic rod is fixedly connected to the output end, and the output end is detachably connected to the dynamic seal.

[0009] As a further improvement of this utility model: a waist-shaped hole is provided radially through the side wall of the first telescopic rod, and the length of the waist-shaped hole extends axially; the second telescopic rod is a solid steel rod, and a through positioning hole is provided radially through its rod body. The diameter of the positioning hole matches the width of the waist-shaped hole of the first telescopic rod, and the positioning pin can be inserted into both at the same time to realize the length adjustment and fixation between the first telescopic rod and the second telescopic rod.

[0010] As a further improvement of this utility model: the output end is a connecting plate made of steel plate, the connecting plate is fixedly connected to the second telescopic rod, the connecting plate is provided with threaded holes, the diameter of the threaded holes matches the connecting holes on the dynamic seal, and the connecting plate and the dynamic seal are detachably connected by bolts.

[0011] As a further improvement of this utility model, a test fixture for installing dynamic seals is integrated into the helium mass spectrometer leak detector.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: A dynamic seal testing device, through a set rotary drive mechanism, drives the dynamic seal to simulate its actual continuous rotation working state in the ring main unit, which solves the problem of the disconnect between the existing static testing mode and the dynamic working condition of the dynamic seal, realizes the true and accurate evaluation of the dynamic sealing performance of the dynamic seal, and ensures that the test results can effectively reflect its sealing reliability during actual operation; at the same time, with the help of the adjustable telescopic rod structure and replaceable output end, the adaptability of the device to dynamic seals of different specifications is improved, ensuring the universality and convenience of testing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a dynamic seal testing device.

[0014] Figure 2 This is a schematic diagram of the rotary drive mechanism in a dynamic seal testing device.

[0015] Figure 3This is an enlarged view of point A in a dynamic seal testing device.

[0016] In the diagram: 1. Bracket; 2. Motor; 21. Motor mounting base; 3. Auxiliary shaft; 4. Bearing; 5. Universal joint; 6. First telescopic rod; 61. Waist-shaped hole; 7. Second telescopic rod; 71. Positioning hole; 8. Output end; 81. Connecting plate; 82. Threaded hole; 9. Dynamic seal; 10. Helium mass spectrometer leak detector; 11. Test fixture; 13. Bracket fixing plate; 14. Mounting hole. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-3 This utility model discloses a dynamic seal testing device, mainly used for dynamic airtightness testing of dynamic seals in substation ring main units. Its core is to achieve accurate evaluation of sealing performance by simulating the actual rotating working state of the dynamic seal and combining it with helium mass spectrometry leak detection technology. The device includes a helium mass spectrometer leak detector 10 and a rotary drive mechanism, which work together to complete the testing process.

[0019] The helium mass spectrometer leak detector 10 is the basic testing unit, which integrates a test fixture 11. The test fixture 11 has a positioning structure adapted to the dynamic seal 9, which can fix the non-rotating part of the dynamic seal 9, thereby simulating the actual installation environment of the dynamic seal 9 in the ring main unit.

[0020] The rotary drive mechanism is mounted on the frame of the helium mass spectrometer leak detector 10. As the core module for power output and transmission, it is used to drive the rotating parts of the dynamic seal 9 to achieve dynamic simulation. It includes a bracket 1, a drive assembly, a transmission assembly, and an output end 8.

[0021] The bracket 1 serves as the mounting base for the rotary drive mechanism. It is integrally bent into a Z-shaped structure, including two horizontal sections and a vertical section connecting the two horizontal sections. At the end of the lower horizontal section, there is a rectangular bracket fixing plate 13. The bracket fixing plate 13 is positioned opposite to the end of the lower horizontal section, and coaxial mounting holes 14 are opened at corresponding positions. Bolts can pass through the mounting holes 14 on the end of the lower horizontal section and the bracket fixing plate 13 in sequence, and can be detachably connected to the frame of the helium mass spectrometer leak detector 10.

[0022] The drive assembly includes a motor 2 and a motor mounting base 21. The upper horizontal section of the bracket 1 is the mounting platform for the motor 2, and is fixedly connected to the motor 2 through the motor mounting base 21.

[0023] The transmission assembly includes an auxiliary shaft 3, a bearing 4, a universal joint 5, a first telescopic rod 6, and a second telescopic rod 7. The auxiliary shaft 3 is fixedly connected to the output shaft of the motor 2 via a coupling, and the middle part of the auxiliary shaft 3 is inserted into the bearing 4 to achieve stable rotation. The outer ring of the bearing 4 is interference-fitted with the mounting hole of the bracket 1, and the inner ring is transition-fitted with the auxiliary shaft 3. The end of the auxiliary shaft 3 away from the motor 2 is fixedly connected to the input end of the universal joint 5. The output end of the universal joint 5 is fixedly connected to one end of the first telescopic rod 6. The first telescopic rod 6 is a hollow steel tube, and its end away from the universal joint 5 is sleeved on one end of the second telescopic rod 7 and fixedly connected by a locating pin. The other end of the second telescopic rod 7 is fixedly connected to the output end 8, and the output end 8 is detachably connected to the dynamic seal 9.

[0024] On the side wall of the first telescopic rod 6, a waist-shaped hole 61 is provided in the radial direction, which extends through the tube wall. The length of the waist-shaped hole 61 extends in the axial direction. The second telescopic rod 7 is a solid steel rod, and a through positioning hole 71 is provided in the radial direction on its rod body. The diameter of the positioning hole 71 matches the width of the waist-shaped hole 61 of the first telescopic rod 6. The positioning pin can be inserted into both at the same time to realize the length adjustment and fixation between the first telescopic rod 6 and the second telescopic rod 7.

[0025] The output end 8 can be selected with different structures according to the different structures of the dynamic seal 9 to be tested, so as to meet the needs of different connection forms. In this embodiment of the utility model, the output end 8 is a connecting plate 81 made of steel plate. The connecting plate 81 is fixedly connected to the second telescopic rod 7. The connecting plate 81 is provided with a threaded hole 82. The diameter of the threaded hole 82 matches the connecting hole on the dynamic seal 9. The connecting plate 81 and the dynamic seal 9 are detachably connected by bolts.

[0026] The working principle of this utility model is as follows: First, the dynamic seal 9 to be tested is placed in the test fixture 11 of the helium mass spectrometer leak detector 10. The non-rotating part of the dynamic seal 9 is fixed by the positioning structure of the test fixture 11 to simulate its installation environment in the ring main unit. Then, the relative positions of the first telescopic rod 6 and the second telescopic rod 7 of the rotary drive mechanism are adjusted so that the oblong hole 61 of the first telescopic rod 6 is aligned with the positioning hole 71 of the second telescopic rod 7. The positioning pin is inserted to fix the length, ensuring that the connecting plate 81 of the output end 8 matches the position of the rotating part of the dynamic seal 9. Next, the connecting plate 81 and the rotating part of the dynamic seal 9 are detachably connected by bolts through the threaded hole 82 on the connecting plate 81 to achieve the docking of the power transmission path. Then, the motor 2 of the drive assembly is started. The motor 2 transmits power to the auxiliary shaft 3, the universal joint 5, the first telescopic rod 6, and the second telescopic rod 7. Finally, the output end 8 drives the rotating part of the dynamic seal 9 to rotate synchronously, simulating the rotation state during actual operation. After the dynamic seal 9 has rotated stably, start the helium mass spectrometer leak detector 10 and spray helium gas onto the sealing surface of the dynamic seal 9 according to the normal operation. If there is a leak, the helium gas will enter the interior through the leak hole and be sucked into the leak detector. After the detection system analyzes the data, the leakage data will be fed back, and the dynamic airtightness test will be completed. After the test is completed, turn off the motor 2 and the helium mass spectrometer leak detector 10 in sequence, remove the bolts to separate the connecting plate 81 from the dynamic seal 9, and take out the tested dynamic seal 9.

[0027] 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 dynamic seal testing device, characterized in that, It includes a helium mass spectrometer leak detector (10) and a rotary drive mechanism mounted on the frame of the helium mass spectrometer leak detector (10). The rotary drive mechanism includes a bracket (1), a drive assembly, a transmission assembly, and an output end (8).

2. The dynamic seal testing device according to claim 1, characterized in that, The bracket (1) serves as the mounting base for the rotary drive mechanism. It is bent into a Z-shaped structure and includes two horizontal sections and a vertical section connecting the two horizontal sections. A rectangular bracket fixing plate (13) is provided at the end of the lower horizontal section. The bracket fixing plate (13) is positioned opposite to the end of the lower horizontal section and coaxial mounting holes (14) are provided at corresponding positions. Bolts can pass through the mounting holes (14) on the end of the lower horizontal section and the bracket fixing plate (13) in sequence and can be detachably connected to the frame of the helium mass spectrometer leak detector (10).

3. The dynamic seal testing device according to claim 2, characterized in that, The drive assembly includes a motor (2) and a motor mounting base (21). The upper horizontal section of the bracket (1) is the mounting platform for the motor (2), which is fixedly connected to the motor (2) through the motor mounting base (21).

4. The dynamic seal testing device according to claim 3, characterized in that, The transmission assembly includes an auxiliary shaft (3), a bearing (4), a universal joint (5), a first telescopic rod (6), and a second telescopic rod (7). The auxiliary shaft (3) is fixedly connected to the output shaft of the motor (2) through a coupling. The middle part of the auxiliary shaft (3) is inserted into the bearing (4) to achieve stable rotation. The outer ring of the bearing (4) is interference-fitted with the mounting hole of the bracket (1), and the inner ring is transition-fitted with the auxiliary shaft (3). The end of the auxiliary shaft (3) away from the motor (2) is fixedly connected to the input end of the universal joint (5). The output end of the universal joint (5) is fixedly connected to one end of the first telescopic rod (6). The first telescopic rod (6) is a hollow steel pipe. Its end away from the universal joint (5) is sleeved on one end of the second telescopic rod (7) and fixedly connected by a positioning pin. The other end of the second telescopic rod (7) is fixedly connected to the output end (8). The output end (8) is detachably connected to the dynamic seal (9).

5. The dynamic seal testing device according to claim 4, characterized in that, On the side wall of the first telescopic rod (6), a waist-shaped hole (61) is provided in the radial direction, and the length of the waist-shaped hole (61) extends in the axial direction; the second telescopic rod (7) is a solid steel rod, and a through positioning hole (71) is provided in the radial direction on its rod body. The diameter of the positioning hole (71) matches the width of the waist-shaped hole (61) of the first telescopic rod (6). The positioning pin can be inserted into both at the same time to realize the length adjustment and fixation between the first telescopic rod (6) and the second telescopic rod (7).

6. The dynamic seal testing device according to claim 4, characterized in that, The output end (8) is a connecting plate (81) made of steel plate. The connecting plate (81) is fixedly connected to the second telescopic rod (7). The connecting plate (81) has a threaded hole (82). The diameter of the threaded hole (82) matches the connecting hole on the dynamic seal (9). The connecting plate (81) and the dynamic seal (9) are detachably connected by bolts.

7. The dynamic seal testing device according to claim 1, characterized in that, The helium mass spectrometer leak detector (10) integrates a test fixture (11) for installing the dynamic seal (9).

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