A test fixture for sealing a float valve with a one-way valve

Abstract

This utility model discloses a sealing test fixture for a float valve with a one-way valve, belonging to the field of aerospace equipment technology. It includes an L-shaped fixed bracket, a support mounted on the upper end of the fixed bracket, a funnel fixed below the support, a weight suspending the float cylinder of the float valve, and an adapter connected to the outer body pipe fitting. The outer flange of the float valve is mounted on the support to fix its installation angle. The weight provides a stable external force. The adapter connects the pipe fitting to a hydraulic source. A measuring cup is placed below the funnel to collect leaked liquid and measure the amount of leaked oil. This utility model is designed according to the structure, on-board installation state, and working conditions of a float valve with a one-way valve, ensuring the sealing test requirements of the product.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment technology and relates to a float valve sealing test fixture with a one-way valve. Background Technology

[0002] The float valve with a one-way valve on a certain type of aircraft is shown below. Figure 1 As shown, the one-way valve section has a sealing structure where the valve plate and the outer body are internally butted together at one end. A flange is mounted on the bottom plate of the oil tank in the middle of the outer body, and the other end of the outer body has a pipe fitting. The float is connected to the valve plate via a connecting rod approximately 500mm long. Under the action of the float's gravity and the buoyancy of the oil, the connecting rod drives the valve plate to open and close, ensuring the valve seal. In other words, the opening and closing of the oil pipeline is controlled by the rise and fall of the float. During repair, the valve plate and the outer body are lapped together to ensure a seal, and a valve seal test is conducted to check the sealing performance of the mating surfaces. The conventional plate valve seal test method involves applying a specified air or oil pressure in the closing direction of the valve plate and checking for air or oil leakage at the valve. However, the valve seal test for a float valve with a one-way valve simulates the product's operating conditions on the machine. According to the technical document requirements, fix the float valve on the special support, keep the flange installation angle of the outer body at 44°50′±10′, apply an external force (6.276±0.31)N in the direction P at the center of the float, and then fill it with 0.15MPa kerosene pressure in the direction D (i.e., the opening direction of the valve plate), allowing the valve to leak no more than 35mL per minute; or rotate the float valve 180° and install it, apply an external force (3.04±0.15)N in the opposite direction P (i.e., the direction of the float's gravity) at the center of the float, and then fill it with 0.15MPa kerosene pressure in the direction D, allowing the valve to leak no more than 35mL per minute.

[0003] Because the flange installation angle of the outer body is strictly required during the valve sealing test, and because the float is large and experiences significant swaying when suspended during the test, using a spring thrust gauge to apply force along the P direction is not only difficult to position, but also results in unstable force values ​​that cannot be guaranteed to be within tolerance, leading to inaccurate measurement results. Therefore, the original sealing test fixture cannot meet the requirements of the float valve sealing test. Utility Model Content

[0004] This utility model provides a float valve sealing test fixture with a one-way valve. On the one hand, it can ensure the installation state of the float valve during the test, that is, the outer flange is fixed to the mounting bracket of the test fixture at 44°50′±10′, and the float is horizontally suspended by gravity under the support of the connecting rod. On the other hand, it can apply a stable external force of (3.04±0.15)N to the center of the float in the direction of gravity. Finally, it can pressurize the valve plate in the opening direction and collect and measure the oil leakage. It can accurately measure the sealing performance and oil leakage of the valve, and the measurement is convenient, simple to operate, and the results are stable.

[0005] The present invention adopts the following technical solution:

[0006] A float valve sealing test fixture with a one-way valve includes a fixed bracket, a support 1, a funnel 2, a force-applying weight, and an adapter.

[0007] The fixed bracket is L-shaped and is formed by fixing the bracket 3 and the fixed base 4 together. The fixed base 4 is fixed to the lower end of the bracket 3.

[0008] The support 1 is installed on the upper end of the fixed bracket. The support 1 is designed according to the outer dimensions of the float valve and the dimensions of the flange on its outer body. The mounting surface has flange mounting holes for fixed connection with the flange on the outer body of the float valve. The mounting surface forms an angle of 44°50′±10′ with the horizontal plane, so that the flange mounting angle of the outer body is fixed at 44°50′±10′.

[0009] The funnel 2 is fixed to the fixed bracket below the support 1 by the funnel mounting plate. A measuring cup is placed under the funnel to collect the fuel leaking from the valve and let it flow into the measuring cup to measure the amount of fuel leaked.

[0010] The applied weight weighs 310g, which is calculated based on the external force requirement of the float in the closed test, i.e. (3.04±0.15)N. During the test, the applied weight is suspended in the middle of the float, which not only meets the test force requirement, but also ensures that the applied force is consistent in each test.

[0011] The adapter is designed according to the size of the pipe fitting on the outer body of the float valve. One end of the adapter is sealed to the pipe fitting, and the other end is connected to a hose. It is used to connect the hydraulic source to the pipe fitting to pressurize the valve plate in the opening direction.

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

[0013] 1) This sealing test fixture is designed according to the structure, on-machine installation status and working conditions of a float valve with a one-way valve, which can ensure the test requirements of the product;

[0014] 2) Using fixed weights instead of spring thrust gauges to perform force tests on the float is convenient and the force value is accurate and stable. Attached Figure Description

[0015] Figure 1 Schematic diagram of a float valve with a one-way valve

[0016] Figure 2 This is a schematic diagram of the main structure of the test support;

[0017] Wherein: 1-support; 2-funnel; 3-bracket; 4-fixed base. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below.

[0019] A test fixture for sealing a float valve with a one-way valve, such as... Figure 2 As shown, it includes a support 1, a funnel 2, a bracket 3, a fixed base 4, a force-applying weight, and an adapter.

[0020] The bracket 3 is a U-shaped frame with a fixed base 4 fixedly connected to its lower end. After the two are fixed, they form an L-shape. A support 1 is installed on the upper end of the bracket 3. The support 1 is designed according to the outer dimensions of the float valve and the dimensions of the flange on its outer body. Flange mounting holes are made on its mounting surface for fixed connection with the flange on the outer body of the float valve. The mounting surface forms an angle of 44°50′±10′ with the horizontal plane, so that the flange mounting angle of the outer body is fixed at 44°50′±10′.

[0021] The funnel 2 is fixed to the bracket 3 below the support 1 by the funnel mounting plate. A measuring cup is placed under the funnel to collect the fuel leaking from the valve and let it flow into the measuring cup to measure the amount of fuel leaked.

[0022] The applied weight weighs 310g, which is calculated based on the external force requirement of the float in the closed test, i.e. (3.04±0.15)N. During the test, the applied weight is suspended in the middle of the float, which not only meets the test force requirement, but also ensures that the applied force is consistent in each test.

[0023] The adapter is designed according to the size of the pipe fitting on the outer body of the float valve. The inner cavity of the adapter is designed to have a 74°±30′ conical surface that contacts and seals with the 74°±30′ conical surface of the pipe fitting. The adapter connects the hydraulic source to the pipe fitting through a connecting hose to pressurize the valve plate in the opening direction.

[0024] In use, place the float valve sealing test fixture on the operating table of the test bench, rotate the float valve 180°, and attach its flange to support 1 and fix it with 12 M6 screws. The float is horizontally suspended below and to the side of support 1 under the support of the connecting rod. Suspend the force-adding weight with a rope to the middle of the float to apply an external force of 3.04N to the float. Screw the adapter onto the nozzle of the float valve body, and then connect the adapter to the hydraulic source through a rubber hose to apply a fuel pressure of 0.15MPa to the valve opening direction. Place the funnel 2 on the funnel mounting plate, and place a measuring cup under the funnel 2. During the sealing test, the fuel leaking from the valve flows into the measuring cup through the funnel 2. Finally, measure the amount of oil leakage from the valve.

[0025] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A float valve sealing test fixture with a one-way valve, characterized in that, Includes a fixed bracket, a support (1), a funnel (2), a force-adding weight, and an adapter; The fixed bracket is L-shaped, with a support (1) installed at its upper end. The support (1) has a flange mounting hole on its mounting surface for fixed connection with the flange on the outer body of the float valve. The funnel (2) is fixed to the fixed bracket below the support (1) by the funnel mounting plate. A measuring cup is placed under the funnel to collect leaked oil and measure the amount of leaked oil. A force-adding weight is suspended in the middle of the float cylinder of the installed float valve to provide a stable external force. The adapter is sealed to the pipe fitting and connected to the hydraulic power source through a hose.

2. The float valve sealing test fixture with a one-way valve according to claim 1, characterized in that, The fixed bracket is formed by a bracket (3) and a fixed base (4) fixedly connected together, wherein the fixed base (4) is fixed at the lower end of the bracket (3).

3. The float valve sealing test fixture with a one-way valve according to claim 1, characterized in that, The mounting surface of the support (1) forms an angle of 44°50′±10′ with the horizontal plane.

4. The float valve sealing test fixture with a one-way valve according to claim 1, characterized in that, The added weight weighs 310g.

Images