A pneumatic quick-change sealing joint device suitable for sealing test

Abstract

This utility model relates to the field of sealing joint technology, and in particular to a pneumatic quick-change sealing joint device suitable for sealing tests. It includes an elbow pipe, a locking sleeve seat, a one-way air inlet connector, a locking sleeve, and a straight pipe. A locking sleeve seat is fixedly connected to the outer peripheral wall of the left end of the elbow pipe. A one-way air inlet connector is installed through the top of the locking sleeve seat, and its inner channel communicates with the inside of the locking sleeve seat. A one-way exhaust connector is installed through the rear side of the locking sleeve seat, and an exhaust valve is installed on the one-way exhaust connector. A locking sleeve is embedded in the inner hole of the locking sleeve seat. Air is injected into the inflation chamber through the one-way air inlet connector. The soft, wear-resistant rubber locking sleeve expands radially under air pressure, tightly clamping the outer peripheral wall of the straight pipe to form a stable sealing structure. Furthermore, the sealing design of the inflation chamber and the one-way air inlet method maintain stable pressure within the chamber, meeting the core requirement of airtightness in sealing tests and preventing gas leakage during the test.

Description

Technical Field

[0001] This utility model relates to the field of sealing joint technology, and in particular to a pneumatic quick-change sealing joint device suitable for sealing testing. Background Technology

[0002] Sealing performance testing is a critical step in the manufacturing and maintenance of piping systems, containers, and various hydraulic and pneumatic components. This type of testing requires the testing equipment to be connected quickly and reliably to the component under test (such as straight pipes or nozzles) to form a seal.

[0003] Traditional test connectors often use threaded connections or mechanical clamps. Threaded connections require multiple rotations and often necessitate the use of sealing materials, making the operation cumbersome and time-consuming, and prone to thread wear under frequent disassembly and assembly. While mechanical clamps are faster than threaded connections, they still require bolt tightening or lever operations, and the clamping force may be unevenly distributed, posing a risk of damaging the workpiece surface or failing to provide a proper seal.

[0004] Especially in situations requiring frequent and rapid switching of test objects, such as multi-station inspection on a production line, the efficiency bottleneck of the above methods is particularly prominent. Therefore, there is a clear need in the prior art for a sealing joint device that can achieve rapid insertion and removal, efficient sealing, and no damage to the workpiece surface. This utility model aims to overcome the shortcomings of the above-mentioned prior art and provide a pneumatic quick-change sealing joint device that is simpler to operate and more efficient. Utility Model Content

[0005] In order to overcome the shortcomings of existing threaded or mechanical sealing joints, which are inconvenient to install and disassemble and time-consuming and labor-intensive to operate, this utility model provides a pneumatic quick-change sealing joint device suitable for sealing testing.

[0006] Technical Solution: A pneumatic quick-change sealing joint device suitable for sealing tests includes an elbow pipe, a locking sleeve, a one-way air inlet connector, a locking sleeve, a straight pipe, a one-way exhaust connector, and an exhaust valve. The locking sleeve is fixedly connected to the outer peripheral wall of the left end of the elbow pipe. A one-way air inlet connector is installed through the top of the locking sleeve, and the inner channel of the one-way air inlet connector communicates with the inside of the locking sleeve. A one-way exhaust connector is installed through the rear side of the locking sleeve, and an exhaust valve is installed on the one-way exhaust connector. A locking sleeve is embedded in the inner hole of the locking sleeve, and an inflation chamber is formed between the outer peripheral wall of the locking sleeve and the inner wall of the locking sleeve. The inner channels of the one-way air inlet connector and the one-way exhaust connector are both connected to the inflation chamber. The straight pipe is sealed and inserted into the inner side of the locking sleeve along the axial direction of the locking sleeve.

[0007] Furthermore, the locking sleeve is made of soft, wear-resistant rubber.

[0008] Furthermore, both the one-way air intake connector and the one-way air exhaust connector are connected to the locking sleeve seat by threads, and an O-ring is provided at the connection.

[0009] Furthermore, it also includes a tapered guide ring. The end of the locking sleeve away from the elbow pipe is connected to the tapered guide ring, and the inner wall of the tapered guide ring is a continuous and smooth tapered surface.

[0010] Furthermore, the inlet edge of the tapered guide ring is provided with a V-shaped transition structure.

[0011] Furthermore, the locking sleeve has a composite structure with a fiber reinforcement layer embedded inside.

[0012] Compared with the prior art, the present invention has the following advantages: 1. By inflating the inflation chamber through the one-way air inlet connector, the locking sleeve made of soft wear-resistant rubber expands radially under the action of air pressure, which can tightly clamp the outer peripheral wall of the straight pipe to form a stable sealing structure; and the sealing design of the inflation chamber and the one-way air inlet method can maintain the stable pressure inside the chamber, meet the core requirements of air tightness for sealing test, and avoid gas leakage during the test.

[0013] 2. The device is equipped with a tapered guide ring, whose inner tapered surface can guide the straight pipe to be inserted into the locking sleeve along the coaxial direction, avoiding the problem of poor sealing fit caused by the straight pipe being inserted at an angle, ensuring that the straight pipe quickly and accurately fits the inner wall of the locking sleeve, reducing installation and adjustment time, and improving the preparation efficiency before the sealing test.

[0014] 3. During disassembly, simply operate the exhaust valve to quickly expel the gas from the inflation chamber through the one-way exhaust connector. The locking sleeve quickly returns to a relaxed state as the air pressure disappears, and the straight tube can be pulled out without complicated disassembly procedures. The overall disassembly and assembly process is simple, which greatly shortens the disassembly and assembly cycle of a single test and is suitable for scenarios where straight tubes are frequently replaced in sealing tests. Attached Figure Description

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

[0016] Figure 2 This is a three-dimensional structural diagram of the elbow pipe, locking sleeve seat, and one-way air inlet connector of this utility model.

[0017] Figure 3 This utility model Figure 2 Exploded view.

[0018] Figure 4 This is a three-dimensional sectional view of the locking sleeve, inflation chamber, and straight tube of this utility model.

[0019] The parts and their numbers in the diagram are as follows: 1. Elbow pipe, 2. Locking sleeve seat, 3. One-way air inlet connector, 4. Locking sleeve, 5. Inflation chamber, 6. Straight pipe, 7. Conical guide ring, 8. One-way exhaust connector, 9. Exhaust valve. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Example: A pneumatic quick-change sealing joint device suitable for sealing tests, such as... Figures 1-4 As shown, the system includes an elbow pipe 1, a locking sleeve 2, a one-way air inlet connector 3, a locking sleeve 4, a straight pipe 6, a one-way exhaust connector 8, and an exhaust valve 9. The locking sleeve 2 is fixedly connected to the outer periphery of the left end of the elbow pipe 1. The right end of the elbow pipe 1 is the external pipe connection end, used for sealed communication with the external pipe of the system under test. A one-way air inlet connector 3 is installed through the top of the locking sleeve 2, and its inner channel communicates with the inside of the locking sleeve 2. A one-way exhaust connector 8 is installed through the rear side of the locking sleeve 2, and an exhaust valve 9 is installed on the one-way exhaust connector 8 to control the opening and closing of its inner channel. Both the one-way air inlet connector 3 and the one-way exhaust connector 8 are connected to the locking sleeve 2 by threads, and an O-ring seal is provided at the connection. The threaded connection facilitates disassembly and maintenance, and the O-ring seal enhances the airtightness of the connection, preventing air leakage during inflation or deflation. A locking sleeve 4 is embedded in the inner hole of the sleeve 2, and the outer periphery of the locking sleeve 4... The inner wall of the locking sleeve 4 is tightly fitted to the inner wall of the locking sleeve 2, forming an annular sealed inflation chamber 5. The inner channels of the one-way air inlet connector 3 and the one-way air outlet connector 8 are connected to the inflation chamber 5, ensuring that gas can enter the inflation chamber 5 through the one-way air inlet connector 3 and exit the inflation chamber 5 through the one-way air outlet connector 8. The straight tube 6 is sealed and inserted into the inner side of the locking sleeve 2 along the axial direction of the locking sleeve 2, and the outer peripheral wall of the straight tube 6 is tightly fitted to the inner wall of the locking sleeve 4, forming an initial sealing fit. The locking sleeve 4 is made of soft wear-resistant rubber material, which has good elastic recovery, resistance to compression permanent deformation and wear resistance. It can maintain sealing performance under repeated inflation and deflation conditions, extending service life. The locking sleeve 4 is a composite structure with a fiber reinforcement layer embedded inside, which can effectively limit the excessive expansion or deformation of the locking sleeve 4 under high pressure, improve its pressure bearing capacity and service life, and ensure more uniform clamping force to avoid local tearing.

[0022] like Figures 1-4As shown, it also includes a tapered guide ring 7. The end of the locking sleeve seat 2 away from the elbow pipe 1 is connected to the tapered guide ring 7. The inner wall of the tapered guide ring 7 is a continuous and smooth tapered surface. Its inner diameter gradually decreases linearly along the insertion direction of the straight pipe 6 (from the outside to the inside). The minimum inner diameter of the tapered guide ring 7 is matched with the inner diameter of the locking sleeve seat 2, and the maximum inner diameter is greater than the inner diameter of the locking sleeve seat 2. It is used to provide coaxial guidance for the insertion process of the straight pipe 6, so as to avoid the straight pipe 6 from deflecting and causing sealing failure. The inlet end edge of the tapered guide ring 7 is provided with a V-shaped transition structure, which can prevent the straight pipe 6 from rigidly scraping against the tapered guide ring 7 when it is inserted, protect the surface of the straight pipe 6 and the edge of the tapered guide ring 7, and at the same time reduce the insertion resistance and improve the smoothness of operation.

[0023] During the sealing test, the straight pipe 6 is inserted into the locking sleeve seat 2 from the outside to the inside along the axis of the conical guide ring 7. The straight pipe 6 first contacts the inner wall of the conical guide ring 7. With the guidance of the conical surface of the inner wall of the conical guide ring 7, the straight pipe 6 and the locking sleeve seat 2 are kept coaxial to avoid insertion deviation. The straight pipe 6 is continued to be inserted until it is completely in contact with the inner wall of the locking sleeve 4, completing the initial installation. At this time, the locking sleeve 4 forms an initial seal with the outer peripheral wall of the straight pipe 6 due to its own elasticity. The external air supply unit (such as an air compressor) is connected to the one-way air inlet connector 3 through the air pipe, and the external air supply unit is controlled by the solenoid valve. Compressed gas is injected into the one-way air inlet connector 3. The compressed gas enters the inflation chamber 5 through the inner channel of the one-way air inlet connector 3. Since the inflation chamber 5 is a sealed structure, the gas pressure gradually increases and acts evenly on the outer peripheral wall of the locking sleeve 4. The locking sleeve 4, made of soft wear-resistant rubber, expands radially inward under the action of air pressure, tightly clamping the outer peripheral wall of the straight tube 6, so that a reliable sealing structure is formed between the straight tube 6 and the locking sleeve seat 2. The inflation pressure is set according to the sealing test requirements. After the pressure stabilizes, the connection between the external air supply unit and the one-way air inlet connector 3 is disconnected, and the device enters the sealing test ready state.

[0024] When the sealing test is completed and the straight pipe 6 needs to be disassembled, operate the exhaust valve 9 to open the inner channel of the one-way exhaust connector 8. The compressed gas in the inflation chamber 5 is quickly discharged through the inner channel of the one-way exhaust connector 8, and the pressure in the inflation chamber 5 drops to atmospheric pressure. As the air pressure disappears, the locking sleeve 4 returns to its initial relaxed state under its own elasticity and no longer applies clamping force to the straight pipe 6. At this time, the straight pipe 6 can be pulled outward along the axial direction of the conical guide ring 7. After the straight pipe 6 is completely pulled out, close the exhaust valve 9 to restore the inflation chamber 5 to a sealed state. The device completes one disassembly and assembly cycle and can be used again.

Claims

1. A pneumatic quick-change sealing joint device suitable for sealing tests, characterized in that, The system includes an elbow pipe (1), a locking sleeve (2), a one-way air inlet connector (3), a locking sleeve (4), a straight pipe (6), a one-way exhaust connector (8), and an exhaust valve (9). The left end of the elbow pipe (1) is fixedly connected to the outer wall of the locking sleeve (2). The top of the locking sleeve (2) is fitted with a one-way air inlet connector (3), the inner channel of which is connected to the inside of the locking sleeve (2). The rear side of the locking sleeve (2) is fitted with a one-way exhaust valve. The head (8) has an exhaust valve (9) installed on the one-way exhaust connector (8). A locking sleeve (4) is embedded in the inner hole of the locking sleeve seat (2). An air chamber (5) is formed between the outer peripheral wall of the locking sleeve (4) and the inner wall of the locking sleeve seat (2). The inner channel of the one-way air inlet connector (3) and the inner channel of the one-way exhaust connector (8) are connected to the air chamber (5). The straight pipe (6) is sealed and inserted into the inner side of the locking sleeve seat (2) along the axial direction of the locking sleeve seat (2).

2. The pneumatic quick-change sealing joint device suitable for sealing testing as described in claim 1, characterized in that, The locking sleeve (4) is made of soft, wear-resistant rubber.

3. A pneumatic quick-change sealing joint device suitable for sealing testing as described in claim 2, characterized in that, Both the one-way air intake connector (3) and the one-way air exhaust connector (8) are connected to the locking sleeve seat (2) by threads, and an O-ring is provided at the connection.

4. A pneumatic quick-change sealing joint device suitable for sealing testing as described in claim 3, characterized in that, It also includes a tapered guide ring (7), and the end of the locking sleeve (2) away from the elbow pipe (1) is connected to the tapered guide ring (7), and the inner wall of the tapered guide ring (7) is a continuous and smooth tapered surface.

5. A pneumatic quick-change sealing joint device suitable for sealing testing as described in claim 4, characterized in that, The inlet edge of the tapered guide ring (7) is provided with a V-shaped transition structure.

6. A pneumatic quick-change sealing joint device suitable for sealing testing as described in claim 5, characterized in that, The locking sleeve (4) is a composite structure with a fiber reinforcement layer embedded inside.

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