Structure for limiting movement of valve in high-pressure valve

Abstract

The invention relates to a structure for limiting the movement of a valve in a high-pressure valve, which is characterized in that a limiting block is additionally arranged, the structure of a shell is improved, and the impact acting force of the movement of the valve acts on the shell through the limiting block, so that the risk of external leakage of a flange seal caused by the impact of the movement of the valve on the flange seal is prevented; the sealing effect of the flange can be ensured, and the working performance of the valve is ensured. Meanwhile, the movable fit relation between the outer diameter of the valve and the shell is converted into movable fit between a flange protruding cylinder and the inner diameter of the valve, the motion precision influence caused by difficult machining of a shell deep hole can be avoided, and the motion consistency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid rocket design, and relates to a structure for limiting the movement of a valve in a high-pressure valve of a liquid rocket engine. BACKGROUND

[0002] In the development of liquid rocket engines, the application of high-pressure valves is increasingly required. The position change of the valve is controlled by high-pressure helium or other means, and the valve moves to the limiting structure, which generates a large force from the moving state to the static state. Usually, a flange is used to limit the movement of the valve, which generates a large impact on the sealing of the flange and the shell. However, in high-pressure valves, the impact of the valve movement on the sealing of the valve cannot be ignored. The impact of the valve movement will affect the sealing effect of the product and cause the risk of valve leakage, which may cause more serious consequences and lead to launch failure. SUMMARY

[0003] The technical problem solved by the application is to overcome the shortcomings of the prior art and provide a structure for limiting the movement of a valve in a high-pressure valve. The flange limiting is converted to the limiting of the valve by the shell, which can ensure the sealing effect of the flange and the working performance of the valve.

[0004] The technical solution of the application is as follows: A structure for limiting the movement of a valve in a high-pressure valve, comprising a shell, a flange, a fastener, a sealing gasket, a limiting block, a spring seat, a spring, a valve, and a top rod. The shell is connected to the flange by the fastener, and the sealing gasket is installed between the shell and the flange. The shell has an inner cavity for placing other parts and serving as a channel for medium flow. The inlet and outlet are arranged radially along the shell. A valve seat is arranged at the position between the inlet and the outlet. The valve seat is an annular protruding structure on the inner wall of the shell. The limiting block is installed on the shell, the spring seat is installed on the limiting block, one end of the spring is in contact with the spring seat, and the other end of the spring is in contact with the valve. A cylinder is protruding from the middle of the flange, which passes through the corresponding round holes of the limiting block and the spring seat, and forms a dynamic fit with the inner hole of the valve. The top rod is located outside the valve and is used to generate an actuating force on the valve. The spring has a pre-tightening force, which tightly contacts the valve with the valve seat and blocks the medium flow. When the actuating force on the top rod exceeds the spring force and the differential pressure force of the medium, the valve is pushed to move away from the valve seat, and the medium flow is restored. When the other end of the valve is in contact with the spring seat, the valve stops moving and transmits the impact force to the shell through the spring seat and the limiting block.

[0005] Preferably, the shell is provided with three evenly distributed arc-shaped inner bosses near one end of the flange, the limiting block is a cylinder, the cylinder is provided with three evenly distributed arc-shaped outer bosses, the middle of the cylinder is provided with a circular hole matching the size of the flange cylinder, and two symmetrical positioning circular holes are arranged on both sides of the middle circular hole; the adjacent arc-shaped outer bosses form a concave structure, and the arc-shaped outer bosses are matched with the arc-shaped inner bosses on the shell.

[0006] Preferably, the limiting block and the shell are installed as follows: The limiting block is inserted along the middle empty space of the arc-shaped inner boss of the shell, and the arc-shaped outer boss of the limiting block is installed on the arc-shaped inner boss of the shell by rotating the limiting block through the two positioning circular holes of the limiting block.

[0007] Preferably, the flange is a stepped structure, and three evenly distributed arc-shaped bosses are arranged at positions corresponding to the three evenly distributed arc-shaped inner bosses of the shell, for inserting the empty space after the arc-shaped bosses of the shell and the limiting block are installed, to prevent the limiting block from rotating.

[0008] Preferably, the shell is provided with an internal thread near one end of the flange, the flange is a stepped structure, the limiting block is a cylinder with an external thread, the limiting block is screwed along the internal thread of the shell to realize the installation of the shell and the limiting block, and the middle of the limiting block cylinder is provided with a circular hole matching the size of the flange cylinder.

[0009] Preferably, the spring seat is a concave rotary body structure, and a circular hole matching the size of the flange cylinder is arranged in the middle of the spring seat; the inner diameter of the arc-shaped outer boss of the limiting block matches the outer diameter of the spring seat, and the spring seat is installed in the arc-shaped outer boss of the limiting block.

[0010] Preferably, the valve includes a valve metal and a valve nonmetal, the valve metal includes a base and a U-shaped structure on the base, the base and the U-shaped structure are designed in an integrated manner, the opening of the U-shaped structure serves as an inner hole of the valve, and the surface of one side of the base near the outlet is fixed with the valve nonmetal. Preferably, the top rod is located outside the valve and has a certain gap with the valve.

[0011] Preferably, adjusting washers are arranged between the limiting block and the spring seat to adjust the compression amount of the spring and further adjust the sealing specific pressure of the valve.

[0012] Compared with the prior art, the present application has the following beneficial effects: (1) The present application improves the structure of the shell by adding a limiting block, and transmits the impact force of the valve movement to the shell through the limiting block, so as to prevent the impact of the valve movement on the flange sealing, prevent the risk of flange sealing leakage, and ensure the working performance of the valve.

[0013] (2) The structure of the application improves the structure of the flange and the valve, and converts the dynamic cooperation relationship between the outer diameter of the valve and the shell into the dynamic cooperation of the flange protruding cylinder and the inner diameter of the valve, which can avoid the influence of the movement precision caused by the difficult machining of the deep hole of the shell, and increase the consistency of the movement.

[0014] (3) Since the diameter of the dynamic cooperation is reduced, the required dynamic cooperation distance is shortened, and the axial length of the valve is further reduced, which is beneficial to the weight reduction and lightweight design of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of embodiment 1 of the application; Figure 2 It is a cross-sectional view of the impact position of the shell of embodiment 1; Figure 3 It is a schematic diagram of the flange of embodiment 1; Figure 4 It is a schematic diagram of the limiting block of embodiment 1; Figure 5 It is a schematic diagram of embodiment 2 of the application. DETAILED DESCRIPTION

[0016] The application will be further described below in combination with the drawings and embodiments.

[0017] The application proposes a structure for preventing the impact of valve movement on the flange seal, which includes a shell, a flange, a fastener, a sealing gasket, a limiting block, a spring seat, a spring, a valve, and a top rod.

[0018] The shell is connected with the flange through the fastener, and the sealing gasket is installed between the shell and the flange, which can prevent the medium from flowing to the outside of the shell and play a sealing role.

[0019] The shell is provided with an inner cavity for placing other parts and as a channel for medium flow, and the inlet and outlet are arranged along the radial direction of the shell. An annular protruding structure is arranged at a certain position in the middle of the inlet and outlet along the axial direction, forming a valve seat.

[0020] The limiting block is installed on the shell, the spring seat is installed on the limiting block, one end of the spring is in contact with the spring seat, and the other end is in contact with the valve. The valve is composed of valve metal and valve non-metal. The spring has an installation pre-tightening force, and the pre-tightening force can tightly contact the valve non-metal with the annular protrusion of the shell. When the valve non-metal contacts the annular protruding structure of the shell, the medium flow can be blocked.

[0021] A cylinder extends from the center of the flange, passing through the circular holes of the limiting block and spring seat, forming a dynamic fit with the inner hole of the valve. When the push rod is controlled to apply power, if the force exceeds the spring force and the pressure difference of the medium, it can push the valve to move. At this time, the non-metallic parts of the valve move away from the valve seat, restoring the flow of the medium. When the other end of the valve contacts the spring seat, the valve stops moving and the impact force is transmitted to the housing through the spring seat and the limiting block.

[0022] Example 1: like Figure 1 As shown, this embodiment mainly includes a housing 1, a flange 2, a fastener 3, a sealing gasket 4, a limiting block 5, a spring seat 6, a spring 7, a valve 8, and a top rod 9.

[0023] The housing 1 has three evenly distributed arc-shaped inner bosses at one end near the flange 2, such as... Figure 2 As shown. The housing has an internal cavity for housing other parts and serving as a channel for medium flow. The inlet and outlet are arranged radially along the housing. An annular protrusion is provided at a certain position along the axial direction of the inlet and outlet, which serves as a valve seat.

[0024] The limiting block 5 is a cylinder with three evenly distributed arc-shaped protrusions on its exterior, forming a concave structure with the rest of the cylinder. A large circular hole is located in the center of the cylinder, and two symmetrical small circular holes are located at certain positions outside the large hole. Figure 4 As shown.

[0025] The spring seat 6 is a concave rotating body structure with a circular hole in the middle. The inner diameter of the arc-shaped outer protrusion of the limiting block matches the outer diameter of the spring seat, allowing the spring seat to be installed inside the arc-shaped outer protrusion of the limiting block.

[0026] The valve 8 consists of a valve metal 81 and a valve non-metal 82. The valve metal 81 includes a base and a U-shaped structure on the base. The base and the U-shaped structure are designed as an integrated unit. The opening of the U-shaped structure serves as the inner hole of the valve. The valve non-metal 82 is fixed on the side surface of the base near the outlet.

[0027] The limiting block 5 can be inserted into the middle space of the arc-shaped inner boss of the housing 1, and the arc-shaped outer boss of the limiting block 5 can be installed on the arc-shaped inner boss of the housing 1 by rotating it using the two small holes of the limiting block 5 with a tool. The spring seat 6 can be installed in the concave structure of the limiting block 5. One end of the spring 7 contacts the spring seat 6, and the other end contacts the base of the valve 8. The non-metallic valve 82 of the valve 8 contacts the annular protrusion structure (valve seat) of the housing 1.

[0028] The gasket 4 is installed on the housing 1, and the flange 2 contacts the gasket 4. The housing 1, gasket 3, and flange 2 are connected together by fasteners 3. The gasket prevents the medium from flowing to the outside of the housing, thus providing a seal.

[0029] Flange 2 is a stepped structure, and three arc-shaped bosses are arranged on the same diameter as the three arc-shaped bosses of the shell 1, as shown in Figure 3 The three arc-shaped bosses of the flange 2 can be inserted into the free space of the arc-shaped bosses of the shell 2 and the limiting block 5 to prevent the rotation of the limiting block 5. A cylinder is protruded from the middle of the flange 2, which passes through the circular hole of the limiting block and the spring seat, and forms a dynamic fit with the inner hole (U-shaped opening) of the valve.

[0030] The top rod 9 is outside the valve 8 with a certain gap to prevent affecting the sealing of the valve.

[0031] In addition, adjusting washers can be added between the limiting block 5 and the spring seat 6 to adjust the compression amount of the spring 7 and adjust the sealing specific pressure of the valve 8.

[0032] The number of arc-shaped bosses and the thickness of the bosses can be adjusted according to the structure, and simulation software and other tools can be used to meet the safety factor of the design requirements.

[0033] Embodiment 2: As shown in Figure 5 This embodiment includes a shell 1B, a flange 2B, a fastener 3, a sealing gasket 4, a limiting block 5B, a spring seat 6, a spring 7, a valve 8, and a top rod 9.

[0034] The shell 1B is provided with an internal thread at one end close to the flange 2B. The flange 2B is a stepped structure. The limiting block 5B is a cylinder provided with an external thread. The spring seat 6 is a concave rotary body structure, and a circular hole is arranged between the limiting block and the spring seat.

[0035] The limiting block 5B can be screwed into the internal thread of the shell 1B. The limiting block 5B is designed with a concave structure to install the spring seat 6. One end of the spring 7 is in contact with the spring seat 6, and the other end is in contact with the valve 8. The valve non-metal 82 of the valve 8 is in contact with the annular protruding structure of the shell 1.

[0036] The sealing gasket 4 is installed on the shell 1B, and the flange 2B is in contact with the sealing gasket 4. The shell 1, the sealing gasket 3, and the flange 2 are connected together through the fastener 3.

[0037] The valve 8 is composed of a valve metal 81 and a valve non-metal 82. The valve metal 81 includes a base and a U-shaped structure on the base, which are designed in one body. The opening of the U-shaped structure serves as the inner hole of the valve, and the surface of the base close to the outlet is fixed with the valve non-metal 82.

[0038] A cylinder is protruded from the middle of the flange 2B, which passes through the circular hole of the limiting block 5B and the spring seat 6, and cooperates with the inner hole of the valve 8.

[0039] The top rod 9 is outside the valve 8 with a certain gap to prevent affecting the sealing of the valve.

[0040] In addition, adjusting shims can be added between the limiting block 5B and the spring seat 6 to adjust the compression amount of the spring 7 and adjust the sealing specific pressure of the valve 8.

[0041] The application provides a structure for limiting the movement of a valve in a high-pressure valve, which converts the impact of the valve on a flange into an impact on a shell, thereby ensuring the sealing effect of the flange.

[0042] The part not described in detail in the application belongs to the common knowledge of those skilled in the art.

Claims

1. A structure for limiting the movement of a valve in a high-pressure valve, characterized in that: Includes housing, flange, fasteners, gaskets, limit blocks, spring seats, springs, valves, and push rods; The housing is connected to the flange by fasteners, and a sealing gasket is installed between the housing and the flange. The housing has an inner cavity for placing other parts and serving as a channel for medium flow. The inlet and outlet are arranged radially along the housing. A valve seat is provided at the middle position between the inlet and outlet. The valve seat is an annular protrusion structure on the inner wall of the housing. The limiting block is installed on the housing, and the spring seat is installed on the limiting block. One end of the spring contacts the spring seat, and the other end contacts the valve. A cylinder extends out from the middle of the flange, passes through the corresponding circular holes of the limiting block and the spring seat, and forms a dynamic fit with the inner hole of the valve. The push rod is located on the outside of the valve and is used to generate power to the valve. The spring has a preload force, which keeps the valve in close contact with the valve seat, blocking the flow of media. When the force on the push rod exceeds the force of the spring and the pressure difference of the media, it pushes the valve to move away from the valve seat, restoring the flow of media. When the other end of the valve contacts the spring seat, the valve stops moving and the impact force is transmitted to the housing through the spring seat and the limit block.

2. The structure for limiting the movement of a valve in a high-pressure valve according to claim 1, characterized in that: The housing has three evenly distributed arc-shaped inner bosses near the flange end. The limiting block is a cylinder with three evenly distributed arc-shaped outer bosses on the outside of the cylinder. The cylinder has a circular hole in the middle that matches the size of the flange cylinder, and two symmetrical positioning circular holes on both sides of the central circular hole. A concave structure is formed between adjacent arc-shaped outer bosses, and the arc-shaped outer bosses match the arc-shaped inner bosses on the housing.

3. The structure for limiting valve movement in a high-pressure valve according to claim 2, characterized in that: The installation method of the limit block and the housing is as follows: The limiting block is inserted into the middle space of the arc-shaped inner boss of the shell, and the limiting block is rotated using the two positioning holes of the limiting block to install the arc-shaped outer boss of the limiting block on the arc-shaped inner boss of the shell.

4. The structure for limiting valve movement in a high-pressure valve according to claim 3, characterized in that: The flange has a stepped structure. Corresponding to the three evenly distributed arc-shaped inner bosses of the shell, there are three evenly distributed arc-shaped bosses to fill the empty space after the arc-shaped bosses of the shell and the limiting block are installed, so as to prevent the limiting block from rotating.

5. The structure for limiting valve movement in a high-pressure valve according to claim 1, characterized in that: The housing has an internal thread at the end near the flange. The flange has a stepped structure. The limiting block is a cylinder with external threads. The limiting block is screwed into the housing along the internal thread to realize the installation of the housing and the limiting block. The cylinder of the limiting block has a circular hole in the middle that matches the size of the flange cylinder.

6. The structure for limiting the movement of a valve in a high-pressure valve according to claim 2, characterized in that: The spring seat is a concave rotating body structure with a circular hole in the middle that matches the size of the flange cylinder; the inner diameter of the arc-shaped outer boss of the limiting block matches the outer diameter of the spring seat, and the spring seat is installed inside the arc-shaped outer boss of the limiting block.

7. The structure for limiting valve movement in a high-pressure valve according to claim 1, characterized in that: The valve includes a metal valve and a non-metal valve. The metal valve includes a base and a U-shaped structure on the base. The base and the U-shaped structure are designed as an integrated unit. The opening of the U-shaped structure serves as the inner hole of the valve. The non-metal valve is fixed on the side surface of the base near the outlet.

8. The structure for limiting valve movement in a high-pressure valve according to claim 1, characterized in that: The push rod is located on the outside of the valve, with a certain gap between it and the valve.

9. A structure for limiting the movement of a valve in a high-pressure valve according to claim 1, characterized in that: An adjusting shim is added between the limit block and the spring seat to adjust the spring compression, thereby adjusting the sealing pressure of the valve.

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