A shuttle valve pressure seal testing device

Abstract

The present application belongs to the field of pressure seal test, and particularly relates to a shuttle valve pressure seal test device. The device comprises a shell, a shuttle valve, a pipe joint, a seal pressing device; wherein a cavity accommodating the shuttle valve is arranged in the shell, the cavity is externally provided with three ports ABC, the A port and the C port are pressure inlet and outlet for seal test, and the B port is a flow detection port for performance test; the shuttle valve is loaded into the cavity from the C port, and one end of the shuttle valve abuts against the passage in the A port; the seal pressing device is installed in the passage in the C port, and abuts against the other end of the shuttle valve to prevent the shuttle valve from moving, the C port is externally connected with the pipe joint, and the C port cooperates with the pipe joint to tightly press the seal pressing device.

Description

Technical Field

[0001] This invention belongs to the field of pressure sealing test, and specifically relates to a shuttle valve pressure sealing test device. Background Technology

[0002] As a core component of aviation hydraulic control, the shuttle valve is small in size and requires high precision. During its development, the traditional pressure testing method involves installing the shuttle valve into the hydraulic product and conducting a pressure test. The quality of the shuttle valve is then judged based on the test results. Since hydraulic products consist of multiple components, problems in other components can also lead to unqualified test results. Therefore, repeated installation, testing, disassembly, and analysis are required to reach a conclusion, resulting in low testing efficiency. Furthermore, the entire testing process is difficult due to the challenges of installing and disassembling the shuttle valve. During this process, the grooves on the outer cylindrical surface of the shuttle valve can easily scratch the sealing ring, causing seal damage and test failure. Summary of the Invention

[0003] To address the problems of low testing efficiency and difficulty in installing and disassembling shuttle valves in existing technologies, a shuttle valve pressure sealing test device is proposed.

[0004] A shuttle valve pressure sealing test device is provided, comprising: a housing, a shuttle valve, a pipe joint, and a sealing and clamping device; The housing contains a cavity for accommodating the shuttle valve. The cavity has three ports (A, B, and C) facing outwards. Ports A and C are the pressure inlet and outlet for sealing tests, and port B is the flow detection port for performance tests. The shuttle valve is inserted into the cavity through port C, with one end abutting against the inner channel of port A. A sealing and clamping device is installed in the inner channel of port C, abutting against the other end of the shuttle valve to prevent it from moving. A pipe connector is connected to port C, and port C mates with the pipe connector to tightly press the pipe connector against the sealing and clamping device.

[0005] Furthermore, the sealing and clamping device includes: a third sealing ring, a pressure sleeve, a pressure head, and a pipe fitting; Port C is a countersunk hole design. The small end of the inner channel of Port C is connected to the inner cavity. The third sealing ring is inserted into the bottom of the large end of the inner channel of Port C, and a pressure sleeve is fitted onto Port C. The pressure head passes through the pressure sleeve and is inserted into the small end of the inner channel of Port C, contacting the other end of the shuttle valve. The pressure head is partially exposed outside Port C. The inner channel of the pipe joint is designed as a stepped hole. The large end of the pipe joint is screwed to the outside of Port C. The stepped surface presses against the pressure head, so that the pressure head presses against the third sealing ring.

[0006] Furthermore, the small end of the pipe fitting is threaded, and the sealing and tightening device also includes a screw plug; The threaded connection is made with the plug, which holds the pressure head in place. Under pressure, the pressure head is inserted into the shuttle valve to fix it in place.

[0007] Furthermore, the pressure sleeve and the large end of the inner channel of port C are machined with a gapless fit to form a sealing groove with adjustable width.

[0008] Furthermore, during the installation of the shuttle valve pressure sealing test device, the shuttle valve is installed before the third sealing ring.

[0009] Furthermore, the internal channels of port A and port C have the same structure and are equipped with the same sealing and clamping devices.

[0010] Furthermore, port A is also a countersunk hole design, and the device also includes a pressure nozzle and a first sealing ring; The pressure nozzle is installed at the large end of the inner channel of port A, the first sealing ring is installed between the inner channel of port A and the nozzle, a transition section is set at the docking position of the cavity and the small end of port A, and one end of the shuttle valve abuts against the transition section.

[0011] Furthermore, Port B is also a countersunk hole design, and the device also includes: a flow nozzle and a second sealing ring; The flow nozzle is installed at the large end of the inner channel of port A, and the second sealing ring is installed between the inner channel of port A and the nozzle.

[0012] Furthermore, the device also includes: a plug; When performing a pressure sealing test, the plug is installed on the flow nozzle to seal it.

[0013] The beneficial effects of the present invention are at least as follows: This invention allows for pressure testing of shuttle valves independently, reducing the time from shuttle valve installation to test completion from 30 minutes to 15 minutes, improving efficiency by 100%. The test results are clear and can directly determine the quality of the shuttle valve.

[0014] The device of this invention is simple to operate, provides clear test results, effectively improves the testing efficiency of shuttle valves, and reduces the risk of seal ring damage. It can be widely used in pressure testing of aviation, aerospace, and marine-related products.

[0015] The present invention has the following advantages: 1) Simple operation and clear and definite test results; 2) Split-type sealing groove structure design reduces the difficulty of sealing ring installation and the risk of sealing ring damage during installation; 3) The compression of the third sealing ring 4 can be adjusted to adapt to test requirements of different pressures; 4) The installation pre-pressure of the shuttle valve can be adjusted. Attached Figure Description

[0016] Figure 1 A schematic diagram of a shuttle valve pressure sealing test device provided in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the housing 3 provided in an embodiment of the present invention; Figure 3 A three-axis side view of the housing provided in an embodiment of the present invention; Figure 4 This is a front view of the pressure sleeve 5 provided in an embodiment of the present invention; Figure 5 This is a cross-sectional view of the pressure sleeve 5 provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the sealing groove formed by the fitting of the pressure sleeve 5 and the housing 3 in an embodiment of the present invention; Figure 7 This is a front view of the pressure head 6 provided in an embodiment of the present invention; Figure 8 A cross-sectional view of the pressure head 6 provided in an embodiment of the present invention; Figure 9 This is a front view of the screw plug 7 provided in an embodiment of the present invention; Figure 10 A cross-sectional view of the screw plug 7 provided in an embodiment of the present invention; Figure 11 This is a front view of the pipe connector 8 provided in an embodiment of the present invention; Figure 12 This is a cross-sectional view of the pipe fitting 8 provided in an embodiment of the present invention. Detailed Implementation

[0017] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0018] This embodiment presents a shuttle valve pressure sealing test device, as described above. Figure 1 As shown, the device consists of parts such as pressure nozzle 1, first sealing ring 2, housing 3, third sealing ring 4, pressure sleeve 5, pressure head 6, screw plug 7, pipe joint 8, fourth sealing ring 9, plug 10, second sealing ring 11, and flow nozzle 12. This test device can replace hydraulic products and simulate the working environment.

[0019] 1. One of the main components of the pressure sealing test device is the housing 3, such as... Figure 2 and Figure 3 As shown, port A is the pressure inlet and outlet for the sealing test, and port B is the flow detection port for the performance test. The plug 10 is not installed during the performance test. Figure 1 As shown, connect it to the flow meter. When performing the pressure seal test, follow the instructions... Figure 1 The shown installation plug 10 has C port as the pressure inlet and outlet for the sealing test. C port also serves as the installation inlet for the shuttle valve under test. It adopts a threaded boss structure and an external thread connection design, which is more convenient for shuttle valve installation and operation compared to the traditional embedded design. The C port sealing ring installation location adopts a cylindrical countersunk hole design, which cooperates with the pressure sleeve 5 to form a sealing groove.

[0020] 2. The pressure sleeve 5 adopts a frustum structure design, as follows: Figure 4-5 As shown, the outer diameter φd of the small end face is related to the shell 3, as above. Figure 2 As shown, the countersunk hole at C-port is machined with a zero-clearance fit, forming a sealing groove with an adjustable width, as follows. Figure 6 As shown.

[0021] 3. Press head 6 ( Figure 7-8 It is installed in the pressure sleeve 5, with one end in contact with the end face of the shuttle valve and the other end in contact with the end face of the screw plug 7. It is used to transfer load.

[0022] 4. Screw plug 7 ( Figure 9-10 The outer surface is threaded, and it is installed in the pipe fitting 8 by engaging with the internal thread of the pipe fitting 8 to press the shuttle valve.

[0023] 5. Pipe fittings 8 ( Figure 11-12 The pipe fitting 8 is connected to the external thread of the threaded boss of the housing 3 through the pipe fitting 8. Rotating the pipe fitting 8 causes the end face B of the pipe fitting 8 to push the large end face of the pressure sleeve 5, so that the pressure sleeve 5 moves in the direction of pressing the third sealing ring 4, forming a sealing groove of appropriate width with the C opening of the housing 3, so that the third sealing ring 4 generates a certain amount of compression, improving the sealing effect. Then, the screw plug 7 is tightened with a hex wrench, and the load is transmitted to the end face of the shuttle valve through the pressure head 6, so that the shuttle valve is subjected to pre-pressure, ensuring that the shuttle valve is reliably installed in the housing 3 and does not move axially.

[0024] As above Figure 1 As shown, the pressure test installation sequence is as follows: First, install the first sealing ring 2 into the pressure nozzle 1. Then, install the pressure nozzle 1 and the first sealing ring 2 into the A port and B port of the housing 3 respectively. Install the shuttle valve into the housing 3 from the C port. Next, put the third sealing ring 4 on the outer surface of the shuttle valve and push it into the C port of the housing 3. Install the pressure sleeve 5 into the C port of the housing 3. Then, install the pressure head 6. Next, install the fourth sealing ring 9 on the boss of the housing 3. Then, install the screw plug 7 into the pipe joint 8. Finally, install the pipe joint 8 and the screw plug 7 on the boss of the housing 3. Rotate the pipe joint 8 to make the pressure sleeve 5 stick to the third sealing ring 4. Tighten the screw plug 7 with a hex wrench so that the pressure head 6 presses against the end face of the shuttle valve and fixes the shuttle valve axially.

[0025] The device housing 3 features a boss design at the inlet of the shuttle valve, which effectively reduces the relative installation depth of the shuttle valve, making installation and disassembly simple and quick.

[0026] In terms of the sealing groove design, the device adopts a split sealing groove structure design, which changes the installation sequence of the shuttle valve and the sealing ring. First, the shuttle valve is installed into the housing 3, then the third sealing ring 4 is installed, and finally the pressure sleeve 5 is installed. The small end face of the pressure sleeve 5 presses against the third sealing ring 4. The compression of the third sealing ring 4 can be adjusted by the knob pipe joint 8. The pressure sleeve 5 and the housing 3 together form a sealing groove. The pressure head 6, the screw plug 7 and the pipe joint 8 are used together to adjust the pre-pressure of the shuttle valve.

[0027] By introducing compressed air into the pressure nozzle 1 and observing the leakage of the pipe joint 8, the forward sealing quality of the shuttle valve is tested. Conversely, by introducing compressed air into the pipe joint 8 and observing the leakage of the pipe joint 1, the reverse sealing quality of the shuttle valve is tested.

[0028] This invention can efficiently verify the function and performance indicators of shuttle valves. The test operation is simple, which not only improves the test efficiency, but also reduces the risk of damage to the sealing ring during installation. At the same time, the product pre-pressure is adjustable, which can meet the pressure test of shuttle valves with different pre-pressure requirements.

[0029] 1) The inlet C of the shuttle valve is installed in the housing 3 of the device of the present invention (as follows). Figure 2 As shown in port C), the use of a boss-type external thread connection effectively reduces the installation depth of the shuttle valve. Furthermore, the countersunk hole structure at the shuttle valve installation inlet expands the installation space and reduces the difficulty of shuttle valve installation. Traditionally, the installation sequence of the shuttle valve and sealing ring is to install the sealing ring first, then the shuttle valve. During the installation of the shuttle valve, the sharp edges of the grooves on the outer surface of the shuttle valve are prone to scratching the sealing ring when passing through it. This device allows for the installation of the shuttle valve first, followed by the sealing ring, improving the efficiency of shuttle valve installation, reducing the difficulty of installation, and solving the problem of the sealing ring being squeezed and scratched by the shuttle valve during installation. 2) The sealing groove of the device of the present invention adopts a split structure design (as above). Figure 1 As shown, by machining the outer diameter of the small end of the pressure sleeve 5, it is made to slide without gap with the inner diameter of the countersunk hole C of the housing 3. By rotating the toggle connector 8, the pressure sleeve 5 is pushed into the countersunk hole C of the housing 3 to form a sealing groove. The width of the sealing groove can be adjusted by rotating the toggle connector 8. The small end face of the pressure sleeve 5 presses against the third sealing ring 4. The compression of the third sealing ring 4 can be adjusted by rotating the toggle connector 8 to meet different pressure test requirements. 3) The device of the present invention adopts a threaded connection between the screw plug 7 and the pipe connector 8. By turning the screw plug 7 with a torque wrench, the pressure head 6 generates an appropriate pre-pressure on the shuttle valve, ensuring that the shuttle valve does not move axially, and the pre-pressure value is adjustable.

[0030] The above description merely illustrates the embodiments of this application, and while it is quite specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Furthermore, any parts not detailed in this application are conventional techniques.

[0031] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A shuttle valve pressure sealing test device, characterized in that, include: Housing, shuttle valve, pipe fitting, sealing and clamping device; The housing contains a cavity for accommodating the shuttle valve. The cavity has three ports (A, B, and C) facing outwards. Ports A and C are the pressure inlet and outlet for sealing tests, and port B is the flow detection port for performance tests. The shuttle valve is inserted into the cavity through port C, with one end abutting against the inner channel of port A. A sealing and clamping device is installed in the inner channel of port C, abutting against the other end of the shuttle valve to prevent it from moving. A pipe connector is connected to port C, and port C mates with the pipe connector to tightly press the pipe connector against the sealing and clamping device.

2. The apparatus according to claim 1, characterized in that, The sealing and tightening device includes: a third sealing ring, a pressure sleeve, a pressure head, and a pipe fitting; Port C is a countersunk hole design. The small end of the inner channel of Port C is connected to the inner cavity. The third sealing ring is inserted into the bottom of the large end of the inner channel of Port C, and a pressure sleeve is fitted onto Port C. The pressure head passes through the pressure sleeve and is inserted into the small end of the inner channel of Port C, contacting the other end of the shuttle valve. The pressure head is partially exposed outside Port C. The inner channel of the pipe joint is designed as a stepped hole. The large end of the pipe joint is screwed to the outside of Port C. The stepped surface presses against the pressure head, so that the pressure head presses against the third sealing ring.

3. The apparatus according to claim 2, characterized in that, The small end of the pipe fitting is threaded, and the sealing and tightening device also includes a screw plug; The threaded connection is made with the plug, which holds the pressure head in place. Under pressure, the pressure head is inserted into the shuttle valve to fix it in place.

4. The apparatus according to claim 3, characterized in that, The pressure sleeve and the large end of the inner channel of port C are machined with a gapless fit to form a sealing groove with an adjustable width.

5. The apparatus according to claim 4, characterized in that, During the installation of the shuttle valve pressure sealing test device, the shuttle valve is installed before the third sealing ring.

6. The apparatus according to claim 2, characterized in that, The internal channels of port A and port C have the same structure and are equipped with the same sealing and clamping devices.

7. The apparatus according to claim 1, characterized in that, Port A is also a countersunk hole design, and the device also includes a pressure nozzle and a first sealing ring; The pressure nozzle is installed at the large end of the inner channel of port A, the first sealing ring is installed between the inner channel of port A and the nozzle, a transition section is set at the docking position of the cavity and the small end of port A, and one end of the shuttle valve abuts against the transition section.

8. The apparatus according to claim 1, characterized in that, Port B is also a countersunk hole design, and the device also includes: a flow nozzle and a second sealing ring; The flow nozzle is installed at the large end of the inner channel of port A, and the second sealing ring is installed between the inner channel of port A and the nozzle.

9. The apparatus according to claim 1, characterized in that, The device further includes: a plug; When performing a pressure sealing test, the plug is installed on the flow nozzle to seal it.

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