Valve body airtightness testing fixture

Abstract

This utility model discloses a valve body airtightness testing fixture, including a support base and a pressure base symmetrically arranged vertically. The support base is fixedly installed on the upper surface of the lower frame, and a lower sealing gasket is installed on the upper part of the support base. The pressure base is installed on the inner side of the upper frame, and an upper sealing gasket is installed at the bottom of the pressure base. Both the support base and the pressure base have through-holes, and each has an annular protrusion on its facing inner side. An air guide pipe is fixedly connected to the support base, and a pressure gauge is fixedly installed inside the pressure base. The valve body airtightness testing fixture provided by this utility model can ensure balanced force on the valve body during pressurization testing, eliminating the risk of accidental dislodgement or seal failure due to displacement. The integrated design simplifies operation and reading.

Description

Technical Field

[0001] This utility model relates to a valve body airtightness testing fixture, belonging to the field of airtightness testing technology. Background Technology

[0002] Currently, valves such as high-pressure valves, safety valves, gate valves, and regulating valves need to undergo airtightness testing during the production process to ensure that they do not leak during operation.

[0003] Common methods for testing the airtightness of valve bodies mainly include the following:

[0004] The soap and water / leak detection fluid method involves applying soap and water or leak detection fluid to the valve seal and observing whether bubbles are produced to determine if there is a leak; the gas pressure test involves applying air or nitrogen to the valve and observing pressure changes to determine if there is a leak; and the helium leak detection method uses a calibrated mass spectrometer to detect helium leaks under vacuum conditions.

[0005] CN202121377460.8 discloses an airtightness testing device for fire valve bodies. This utility model uses an airtightness tester to introduce gas at a certain pressure into the valve body, maintain the pressure for a period of time, and then detect the pressure of the gas flowing back into the airtightness tester from the lower end of the valve body. The pressure difference before and after is observed to determine whether the airtightness is good.

[0006] The technical solutions disclosed in the aforementioned patent documents still have the following technical problems, based on practical experience:

[0007] 1. The valve body positioning effect is poor. During the pressurization test (especially high pressure), the valve body is prone to displacement, which may lead to accidental dislodgement or seal failure, affecting the normal conduct of airtightness testing.

[0008] 2. The device used to test gas pressure is connected to the valve chamber through pipelines, which poses a potential risk of leakage at the connection points. The device and pipelines are all piled up on the table, resulting in low integration and inconvenience in operation and reading.

[0009] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0010] This utility model addresses the shortcomings of the prior art by providing a valve body airtightness testing fixture, which can ensure balanced force on the valve body during the pressurization test, eliminating the risk of accidental dislodgement or seal failure due to displacement. The integrated design simplifies operation and reading.

[0011] To solve the above technical problems, the present invention adopts the following technical solution:

[0012] The valve body airtightness testing fixture includes a support base and a pressure base symmetrically arranged in the vertical direction. The support base is fixedly installed on the upper surface of the lower frame, and a lower sealing gasket is installed on the upper part of the support base. The pressure base is installed on the inner side of the upper frame, and an upper sealing gasket is installed at the bottom of the pressure base. Both the support base and the pressure base are internally connected, and both the support base and the pressure base have annular protrusions on their opposing inner sides. An air guide pipe is fixedly connected to the support base, and a pressure gauge is fixedly installed inside the pressure base.

[0013] Furthermore, both the upper and lower sealing gaskets are annular structures.

[0014] Furthermore, the lower frame has a square structure, while the upper frame has an inverted U-shaped structure, with the bottom of the upper frame fixed to the upper surface of the lower frame.

[0015] Furthermore, the bottom end of the air duct is connected to the air inlet and air outlet pipes via a T-junction.

[0016] Furthermore, an intake valve is installed at the connection between the intake pipe and the tee, and an exhaust valve is installed at the connection between the exhaust pipe and the tee.

[0017] Furthermore, the pressure gauge head is located above the pressure base.

[0018] Furthermore, the pressure seat is fixed to the bottom end of two sliding rods arranged side by side, and the sliding rods are slidably disposed in the top of the upper frame in a vertical direction.

[0019] Furthermore, a hydraulic cylinder is installed between the two slide rods, with its vertical direction pointing downwards.

[0020] Furthermore, the head of the hydraulic cylinder is connected to the slide rod via a push plate, and the slide rod passes through the push plate and is fixedly connected to it.

[0021] Furthermore, the push plate is located above the pressure gauge head.

[0022] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0023] This utility model adopts a double-protrusion positioning structure. The opposing annular protrusions on the inner sides of the support seat and the pressure seat ensure that the valve body end is accurately and centrally pressed between the upper and lower sealing gaskets, so that the valve body is subjected to balanced force during the test pressurization process, ensuring that the sealing surface is uniformly pressurized, and eliminating the risk of accidental dislodgement or sealing failure due to displacement.

[0024] This utility model adopts an integrated design, which simplifies operation and reading. The pressure gauge is directly fixed inside the pressure base, and the gauge head is located on top for easy observation. It eliminates the cumbersome piping of external pressure sensor components and reduces the potential leakage risk at connection points.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the support base installation;

[0028] Figure 3 This is a schematic diagram of the installation of the pressure seat;

[0029] Figure 4 This is a schematic diagram of the utility model in use.

[0030] In the diagram, 1-lower frame, 2-upper frame, 3-support base, 4-lower sealing gasket, 5-air guide pipe, 6-inlet pipe, 7-outlet pipe, 8-inlet valve, 9-exhaust valve, 10-pressure base, 11-upper sealing gasket, 12-pressure gauge, 13-slide rod, 14-hydraulic cylinder, 15-push plate, 16-valve body to be tested. Detailed Implementation

[0031] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0032] like Figures 1-4 As shown in the figure, this utility model provides a valve body airtightness testing fixture, including a support base 3 and a pressure base 10 symmetrically arranged in the vertical direction. The support base 3 is fixedly installed on the upper surface of the lower frame 1. A lower sealing gasket 4 is installed on the upper part of the support base 3. The pressure base 10 is installed on the inner side of the upper frame 2. An upper sealing gasket 11 is installed at the bottom of the pressure base 10. Both the upper sealing gasket 11 and the lower sealing gasket 4 are annular structures used to seal the end of the valve body 16 to be tested.

[0033] The lower frame 1 has a square structure, and the upper frame 2 has an inverted U-shaped structure. The bottom end of the upper frame 2 is fixed to the upper surface of the lower frame 1.

[0034] Both the support base 3 and the pressure base 10 are internally connected, and both the support base 3 and the pressure base 10 have annular protrusions on their opposing inner sides. The two protrusions are arranged facing each other to position the end of the valve body 16 under test, so as to facilitate the precise installation of the valve body 16 under test. They can also prevent the valve body 16 under test from shifting or falling out during the pressure test, and ensure that the force is balanced.

[0035] The support base 3 is equipped with a duct pipe 5 that is fixedly connected to it. The bottom end of the duct pipe 5 is connected to the inlet pipe 6 and the outlet pipe 7 through a tee. An inlet valve 8 is installed at the connection between the inlet pipe 6 and the tee, and an exhaust valve 9 is installed at the connection between the outlet pipe 7 and the tee.

[0036] A pressure gauge 12 is fixedly installed inside the pressure base 10. The gauge head of the pressure gauge 12 is located above the pressure base 10. The pressure gauge 12 is used to monitor the decrease in pressure inside the valve body 16 under test over a period of time.

[0037] The pressure seat 10 is fixed to the bottom end of two parallel sliding rods 13, which are slidably mounted on the top of the upper frame 2 in a vertical direction.

[0038] A hydraulic cylinder 14, vertically downward, is installed between the two sliding rods 13. The head of the hydraulic cylinder 14 is connected to the sliding rod 13 via a push plate 15. The sliding rod 13 passes through the push plate 15 and is fixedly connected to it. The push plate 15 is located above the pressure gauge 12.

[0039] The hydraulic cylinder 14 drives the slide rod 13 to rise and fall through the push plate 15, which in turn drives the pressure seat 10 at the end of the slide rod 13 to rise and fall.

[0040] The specific working principle of this utility model is as follows:

[0041] First, the hydraulic cylinder 14 presses the valve body 16 under test between the pressure seat 10 and the support seat 3. The end of the valve body 16 under test is effectively sealed by the upper sealing gasket 11 and the lower sealing gasket 4. Then, the inlet valve 8 is opened and the exhaust valve 9 is closed. A certain pressure of gas (test pressure) is introduced into the closed cavity of the valve body 16 under test through the inlet pipe 6. After stabilization, the inlet valve 8 is closed. The pressure drop in the cavity of the valve body 16 under test is monitored by the pressure gauge 12 over a period of time. According to the ideal gas law (PV=nRT), the leakage rate can be calculated based on the pressure drop, the test cavity volume, the stabilization time, and the temperature change, thereby determining whether the valve body 16 under test can meet the design leakage rate standard. After the test, the exhaust valve 9 is opened to release the test gas.

[0042] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A valve body airtightness testing fixture, characterized in that: It includes a support base (3) and a pressure base (10) arranged symmetrically in the vertical direction. The support base (3) is fixedly installed on the upper surface of the lower frame (1). A lower sealing gasket (4) is installed on the upper part of the support base (3). The pressure base (10) is installed on the inner side of the upper frame (2). An upper sealing gasket (11) is installed at the bottom of the pressure base (10). The support base (3) and the pressure base (10) are both internally connected. The support base (3) and the pressure base (10) are both provided with a ring-shaped protrusion on their opposing inner sides. A gas guide pipe (5) is fixedly connected to the support base (3). A pressure gauge (12) is fixedly installed inside the pressure base (10).

2. The valve body airtightness testing fixture as described in claim 1, characterized in that: Both the upper sealing gasket (11) and the lower sealing gasket (4) are ring-shaped structures.

3. The valve body airtightness testing fixture as described in claim 1, characterized in that: The lower frame (1) is a square structure, and the upper frame (2) is an inverted U-shaped structure. The bottom end of the upper frame (2) is fixed to the upper surface of the lower frame (1).

4. The valve body airtightness testing fixture as described in claim 1, characterized in that: The bottom end of the air duct (5) is connected to the air inlet pipe (6) and the air outlet pipe (7) via a tee.

5. The valve body airtightness testing fixture as described in claim 4, characterized in that: An intake valve (8) is installed at the connection between the intake pipe (6) and the tee, and an exhaust valve (9) is installed at the connection between the exhaust pipe (7) and the tee.

6. The valve body airtightness testing fixture as described in claim 1, characterized in that: The pressure gauge (12) head is located above the pressure base (10).

7. The valve body airtightness testing fixture as described in claim 1, characterized in that: The pressure seat (10) is fixed to the bottom end of two sliding rods (13) arranged side by side, and the sliding rods (13) are slidably arranged in the vertical direction inside the top of the upper frame (2).

8. The valve body airtightness testing fixture as described in claim 7, characterized in that: A hydraulic cylinder (14) is installed between the two slide rods (13) and is positioned vertically downwards.

9. The valve body airtightness testing fixture as described in claim 8, characterized in that: The head of the hydraulic cylinder (14) is connected to the slide rod (13) through the push plate (15). The slide rod (13) passes through the push plate (15) and is fixedly connected to it.

10. The valve body airtightness testing fixture as described in claim 9, characterized in that: The push plate (15) is located above the gauge head of the pressure gauge (12).

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