Vacuum sealing performance testing device

Abstract

The utility model provides a vacuum sealing performance testing device which comprises a connecting pipe, valves are installed at the two ends of the connecting pipe, a pressure gauge is installed at the end, away from the connecting pipe, of each valve, a branch pipe is installed in the middle of the outer surface of the connecting pipe, and a hexahedron fixedly connected with the branch pipe is arranged at the end, close to the connecting pipe, of the branch pipe in a sleeved mode. A cylinder cover is arranged on the side, away from the connecting pipe, of the hexahedron, a penetrating hole is formed in the face, facing the hexahedron, of the cylinder cover, a sealing ring is pasted in the penetrating hole and arranged on the branch pipe in a sleeving mode, the hexahedron is in threaded connection with two long screws used for extruding the cylinder cover, and a rubber ring is installed at the end, away from the hexahedron, of the cylinder cover. The pressure gauge has the advantages that a traditional mode that the pressure gauge and the vacuum container are sealed through a raw material belt is abandoned, the raw material belt does not need to be used, frequent replacement is avoided, and material cost is reduced.

Description

Technical Field

[0001] This utility model is a vacuum sealing test device, belonging to the field of vacuum testing. Background Technology

[0002] Vacuum sealing testing is a crucial method for verifying the ability of a vacuum container to prevent gas or liquid leakage and maintain an internal vacuum environment. The container is evacuated, the pumping device is shut off, and the container is sealed. The pressure change over time is then monitored. A significant pressure increase indicates a leak, and the rate of pressure change reflects the degree of leakage. Connecting the pressure gauge to the vacuum container is a critical step in the vacuum sealing test. Threaded connections are a common and widely used method for connecting the pressure gauge to the vacuum container. This connection method is widely adopted in practice due to its simple structure and easy installation.

[0003] However, to ensure a good seal at the threaded connection between the pressure gauge and the vacuum container, PTFE tape is typically wrapped around the threads during connection. PTFE tape has excellent sealing properties, effectively filling the tiny gaps between the threads to prevent gas leakage, thus ensuring the accuracy of vacuum tightness tests. However, this sealing material has a significant drawback: when the pressure gauge is removed from the vacuum container, the PTFE tape is damaged to varying degrees, its sealing performance is greatly reduced, and it cannot be reused. In vacuum tightness testing scenarios involving numerous vacuum containers, new PTFE tape is required each time the pressure gauge is connected. As the number of tests increases, the accumulated amount of PTFE tape consumed becomes considerable, resulting in a significant increase in material costs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a vacuum sealing test device to solve the problems mentioned in the background technology. This utility model abandons the traditional method of relying on PTFE tape to seal the pressure gauge and vacuum container, eliminating the need for PTFE tape, avoiding frequent replacement, and reducing material costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum sealing performance testing device, comprising a connecting pipe, valves installed at both ends of the connecting pipe, a pressure gauge installed at the end of the valves away from the connecting pipe, a branch pipe installed at the middle of the outer surface of the connecting pipe, an external thread machined on the outer surface of the branch pipe away from the connecting pipe, a hexahedron fitted and fixed to the branch pipe at the end of the branch pipe near the connecting pipe, a cylindrical cover provided on the side of the hexahedron away from the connecting pipe, a through hole opened on the side of the cylindrical cover facing the hexahedron, a sealing ring pasted in the through hole, the sealing ring fitted on the branch pipe, two long screws for pressing the cylindrical cover threadedly connected to the hexahedron, a rubber ring installed at the end of the cylindrical cover away from the hexahedron, and an arc-shaped surface machined at the end of the rubber ring away from the cylindrical cover to match the surface of the vacuum container.

[0006] Furthermore, an inner limiting ring and an outer limiting ring are installed on the side of the cylindrical cover facing the hexahedron. The inner limiting ring and the outer limiting ring are arranged concentrically. Two symmetrically arranged arc-shaped plates are inserted between the inner limiting ring and the outer limiting ring. One end of the long screw is in contact with the arc-shaped plate.

[0007] Furthermore, two lugs are symmetrically installed at the end of the hexahedron away from the cylindrical cover, and a threaded hole is opened on one side of each lug, and the long screw is threaded into the threaded hole.

[0008] Furthermore, the lug and the hexahedron are integrally formed, and the two corners of the lug away from the hexahedron are rounded.

[0009] Furthermore, a connecting ring is fixedly connected to one end of the rubber ring near the cylindrical cover, and a ring is installed on the side of the cylindrical cover near the rubber ring. The connecting ring is bonded to the ring with glue.

[0010] Furthermore, the connecting ring and the rubber ring are integrally formed, and the ring and the sleeve are integrally formed.

[0011] Furthermore, a straight elbow is installed at the end of the valve away from the connecting pipe, and the end of the straight elbow away from the valve is connected to the pressure gauge.

[0012] The beneficial effects of this utility model are:

[0013] 1. The sealing ring prevents leakage between the branch pipe and the cylinder cover. The rubber ring fits tightly against the surface of the vacuum container, and the inner and outer limiting rings, along with the arc-shaped plate and long screws, compress the cylinder cover to make the seal even tighter. This ensures that no gas leaks during testing. The pressure gauge accurately monitors the pressure changes inside the vacuum container, ensuring the accuracy and reliability of the vacuum sealing test. It abandons the traditional method of relying on PTFE tape to seal the pressure gauge and vacuum container. The sealing is achieved through components such as sealing rings and rubber rings, eliminating the need for PTFE tape, avoiding frequent replacements, and reducing material costs.

[0014] 2. After the branch pipe is threadedly connected to the vacuum container, adjust the orientation of the pressure gauge as needed, and then tighten the long screw. The long screw will press against the cylinder cover, making the rubber ring fit tightly against the surface of the vacuum container, thereby restricting the position of the pressure gauge. It is not necessary to make the threaded connection between the branch pipe and the vacuum container tight.

[0015] 3. Two symmetrically arranged arc-shaped plates are set between the outer limit ring and the inner limit ring. When the long screw squeezes the cylinder cover, the end of the long screw directly contacts the arc-shaped plate. When the arc-shaped plate is damaged due to sliding friction between it and the long screw, the arc-shaped plate can be replaced separately, which helps to extend the service life of the cylinder cover. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a vacuum sealing performance testing device according to the present invention;

[0018] Figure 2 This is another perspective view of a vacuum sealing performance testing device according to the present invention;

[0019] Figure 3 This is an assembly diagram of the hexahedron, branch pipe, pressure gauge, valve and connecting pipe in a vacuum sealing test device of this utility model;

[0020] Figure 4 This is a schematic diagram of the assembly of the outer limiting ring, the inner limiting ring, and the cylindrical cover in a vacuum sealing test device of this utility model;

[0021] In the diagram: 1-connecting pipe, 2-valve, 3-pressure gauge, 4-long screw, 5-support lug, 6-hexahedron, 7-branch pipe, 8-cylinder cover, 9-ring, 10-connecting ring, 11-rubber ring, 12-arc plate, 13-threaded hole, 14-outer limit ring, 15-inner limit ring, 16-sealing ring. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please see Figures 1-3This utility model provides a technical solution: a vacuum sealing performance testing device, including a connecting pipe 1, with valves 2 installed at both ends of the connecting pipe 1. A straight bend is installed at the end of the valve 2 away from the connecting pipe 1, and the end of the straight bend away from the valve 2 is connected to a pressure gauge 3. A branch pipe 7 is installed at the middle of the outer surface of the connecting pipe 1, and the outer surface of the branch pipe 7 away from the connecting pipe 1 is machined with an external thread. After the branch pipe 7 is threadedly connected to the vacuum container, the gas in the vacuum container is extracted using a pumping device, and a valve 2 is opened. The reading of the pressure gauge 3 is then observed to see if there is any change in a certain period of time, thereby providing data support for judging the vacuum sealing performance of the vacuum container.

[0024] See Figures 1-4 A hexahedron 6 is fitted onto the end of the branch pipe 7 near the connecting pipe 1 and is fixed to the branch pipe 7. A cylindrical cover 8 is provided on the side of the hexahedron 6 away from the connecting pipe 1. A through hole is opened on the side of the cylindrical cover 8 facing the hexahedron 6, and a sealing ring 16 is pasted in the through hole. The sealing ring 16 is fitted onto the branch pipe 7. Two support ears 5 are symmetrically installed on the end of the hexahedron 6 away from the cylindrical cover 8. The support ears 5 and the hexahedron 6 are integrally formed. The two corners of the support ears 5 away from the hexahedron 6 are rounded. A threaded hole 13 is opened on one side of the support ear 5. A long screw 4 for pressing the cylindrical cover 8 is threaded into the threaded hole 13. A rubber ring 11 is installed on the end of the cylindrical cover 8 away from the hexahedron 6, wherein the rubber ring 11 is close to One end of the cylindrical cover 8 is connected and fixed with a connecting ring 10. The connecting ring 10 and the rubber ring 11 are integrally formed. A ring 9 is installed on the side of the cylindrical cover 8 near the rubber ring 11. The ring 9 and the cylindrical cover 8 are integrally formed. The connecting ring 10 is bonded to the ring 9 with glue. The connecting ring 10 and the ring 9 increase the connection range between the rubber ring 11 and the cylindrical cover 8. The end of the rubber ring 11 away from the cylindrical cover 8 is machined with an arc-shaped surface that matches the surface of the vacuum container. The sealing ring 16 prevents leakage between the branch pipe 7 and the cylindrical cover 8. The rubber ring 11 is tightly fitted to the surface of the vacuum container. The inner limiting ring 15, the outer limiting ring 14, and the arc-shaped plate 12, together with the long screw 4, compress the cylindrical cover 8 to make the seal tighter. To ensure no gas leakage during testing, pressure gauge 3 accurately monitors pressure changes inside the vacuum container, guaranteeing the accuracy and reliability of the vacuum sealing test. This method abandons the traditional reliance on PTFE tape to seal the pressure gauge 3 against the vacuum container. Instead, sealing is achieved through components such as sealing ring 16 and rubber ring 11, eliminating the need for PTFE tape, avoiding frequent replacements, and reducing material costs. After the branch pipe 7 is threadedly connected to the vacuum container, the orientation of pressure gauge 3 is adjusted as needed. Then, the long screw 4 is tightened. The long screw 4 presses against the sleeve 8, causing the rubber ring 11 to fit tightly against the surface of the vacuum container. This restricts the position of pressure gauge 3, eliminating the need for a tight connection between the branch pipe 7 and the threaded connection of the vacuum container.

[0025] See Figure 1 and Figure 4An inner limiting ring 15 and an outer limiting ring 14 are installed on the side of the cylindrical cover 8 facing the hexahedron 6. The inner limiting ring 15 and the outer limiting ring 14 are arranged concentrically. Two symmetrically arranged arc-shaped plates 12 are inserted between the inner limiting ring 15 and the outer limiting ring 14. One end of a long screw 4 contacts the arc-shaped plate 12. During long-term use, due to the continuous pressure of the long screw 4 on the arc-shaped plate 12, sliding friction will occur between the two. Inevitably, the arc-shaped plate 12 may wear and be damaged due to this friction. However, the ingenuity of this design is that when this happens, only the arc-shaped plate 12 needs to be replaced, without replacing the entire cylindrical cover 8. This design greatly reduces the need for overall replacement due to component wear, not only reducing maintenance costs but also significantly extending the service life of the cylindrical cover 8, making the use of the entire testing device more economical and efficient.

[0026] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum sealing performance testing device, comprising a connecting pipe (1), characterized in that: Both ends of the connecting pipe (1) are equipped with valves (2). A pressure gauge (3) is installed at the end of the valve (2) away from the connecting pipe (1). A branch pipe (7) is installed at the middle of the outer surface of the connecting pipe (1). The outer surface of the branch pipe (7) away from the connecting pipe (1) is machined with external threads. A hexahedron (6) is fitted onto the end of the branch pipe (7) near the connecting pipe (1) and is fixed to the branch pipe (7). A cylinder is provided on the side of the hexahedron (6) away from the connecting pipe (1). The cover (8) has a perforation on the side facing the hexahedron (6), and a sealing ring (16) is pasted in the perforation. The sealing ring (16) is sleeved on the branch pipe (7). Two long screws (4) for squeezing the cover (8) are threaded on the hexahedron (6). A rubber ring (11) is installed on the end of the cover (8) away from the hexahedron (6). The end of the rubber ring (11) away from the cover (8) is machined with an arc-shaped surface that matches the surface of the vacuum container.

2. The vacuum sealing performance testing device according to claim 1, characterized in that: The inner limiting ring (15) and the outer limiting ring (14) are installed on the side of the cylindrical cover (8) facing the hexahedron (6). The inner limiting ring (15) and the outer limiting ring (14) are arranged concentrically. Two symmetrically arranged arc plates (12) are inserted between the inner limiting ring (15) and the outer limiting ring (14). One end of the long screw (4) is in contact with the arc plate (12).

3. The vacuum sealing performance testing device according to claim 1, characterized in that: Two lugs (5) are symmetrically installed on one end of the hexahedron (6) away from the cylinder cover (8). One side of the lug (5) has a threaded hole (13), and the long screw (4) is threaded into the threaded hole (13).

4. The vacuum sealing performance testing device according to claim 3, characterized in that: The lug (5) and the hexahedron (6) are integrally formed, and the two corners of the lug (5) away from the hexahedron (6) are rounded.

5. The vacuum sealing performance testing device according to claim 1, characterized in that: A connecting ring (10) is fixed to one end of the rubber ring (11) near the cylindrical cover (8). A ring (9) is installed on the side of the cylindrical cover (8) near the rubber ring (11). The connecting ring (10) is glued to the ring (9).

6. The vacuum sealing performance testing device according to claim 5, characterized in that: The connecting ring (10) and the rubber ring (11) are integrally formed, and the ring (9) and the cover (8) are integrally formed.

7. The vacuum sealing performance testing device according to claim 1, characterized in that: The valve (2) is equipped with a straight elbow at the end away from the connecting pipe (1), and the end of the straight elbow away from the valve (2) is connected to the pressure gauge (3).

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