Angle stop valve

Abstract

The utility model discloses an angle stop valve, and relates to the field of gas circuit control for spaceflight. The angle stop valve mainly comprises a shell, a valve element and a piston, an inlet and an outlet are formed in the shell, a sealing opening is formed in the communicating position of the inlet and the outlet, the valve element is installed in the sealing opening, and the piston is installed at the bottom of the valve element. A conical sealing surface matched with the sealing opening is arranged at the upper end of the valve core; a control cavity is defined by the shell, the lower end of the valve element and the spring, and the piston is tightly attached to the side wall of the control cavity. The piston can move up and down relative to the shell through the control cavity so as to drive the valve element to move up and down relative to the sealing opening, and opening and closing of the sealing opening and the sealing face are achieved. And a first spring plug is arranged at the top of the control cavity. The angle stop valve is simple in structure, high in reliability, reliable in sealing performance under high-pressure and low-temperature medium working conditions, and small in loss of a sealing structure.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace gas path control, and particularly relates to an angle stop valve. Background Art

[0002] The existing stop valves can be classified into the following three categories according to their structures:

[0003] a) Straight-through stop valve; the inlet and outlet channels of this valve are in the same direction, forming an angle of 180°, with a small degree of disruption of the flow state and relatively small pressure loss through the valve.

[0004] b) Direct-flow stop valve; the valve stem and the channel form a certain angle, and the valve seat sealing surface and the inlet and outlet channels have a certain angle, and the fluid hardly changes the flow direction. This is the type with the smallest flow resistance among stop valves.

[0005] c) Angle stop valve; the medium inlet and outlet channels are not in the same direction, forming a 90° included angle, which will generate a certain pressure drop. The biggest advantage is that it can be installed at the bend of the pipeline system, saving elbows and being convenient to operate.

[0006] The current angle stop valve has an unsatisfactory sealing performance in a high-temperature and low-pressure working environment and is a bit stretched when working in the aerospace field. In addition, the current angle stop valve usually uses structures such as O-rings for sealing, resulting in relatively large losses to the structure during operation. Summary of the Utility Model

[0007] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an angle stop valve, which has reliable sealing performance under high-pressure and low-temperature medium working conditions, has small losses to the sealing structure, and has a simple structure and strong reliability.

[0008] The utility model provides the following technical solutions:

[0009] An angle stop valve includes a housing, a valve core and a piston. The housing is provided with an inlet and an outlet. A sealing port is provided at the penetration of the inlet and the outlet. The valve core is installed in the sealing port, and the piston is installed at the bottom of the valve core. A conical sealing surface matching the sealing port is provided at the upper end of the valve core; a control cavity is formed by enclosing the lower end of the housing and the valve core, and the piston is in close fit with the side wall of the control cavity; the piston can move up and down relative to the housing through the control cavity, thereby driving the valve core to move up and down relative to the sealing port to realize the opening and closing of the sealing port and the sealing surface; a first pantograph seal is provided at the top of the control cavity.

[0010] Furthermore, a spool guide hole is provided inside the housing; the spool guide hole is located above the control chamber; the spool is arranged inside the spool guide hole; the spool guide hole can achieve the positioning and guiding of the spool. An integrated guiding design of the housing is formed to realize the guiding of the piston and the spool, ensure the axial movement of the spool, and further guarantee the tight fit of the sealing surface.

[0011] Furthermore, a through hole is provided at the bottom of the housing, through which air can be supplied to the bottom of the piston, thereby adjusting the pressure in the control chamber and further controlling the up and down movement of the piston.

[0012] Furthermore, a spring is provided above the piston. The spring can be compressed as the piston moves upward, and when the air supply to the bottom of the piston through the through hole stops, the spring will reset the piston, causing the piston to move downward under the action of the spring, so that the conical sealing surface and the sealing port are in contact, realizing the closing of the valve.

[0013] Furthermore, a spring seat is provided at the top of the control chamber, and the spring is installed on the spring seat; the first lip seal is arranged in the space enclosed by the spring seat, the housing and the spool.

[0014] Furthermore, the spring seat is installed on the control chamber by means of threads, which can fix the first lip seal at the joint of the spring seat, the housing and the spool in the designed position, ensuring that the first lip seal performs the airtight function after ventilation.

[0015] Furthermore, a second lip seal is provided between the through hole and the piston.

[0016] Furthermore, an exhaust port is also provided on the housing. The exhaust port is communicated with the control chamber, and can discharge the redundant gas in the valve, ensuring that the internal structure of the valve will not be blocked and avoiding the generation of additional acting forces that may affect the movement of the valve core. An exhaust valve is provided in the exhaust port. Preferably, the exhaust valve is a one-way valve.

[0017] Furthermore, it also includes a nozzle. The lower end of the housing is sleeved inside the nozzle; a control port is provided on the nozzle, and the control port is communicated with the through hole.

[0018] Furthermore, a purge port is also provided on the housing. The purge port is connected with a purge mechanism, and the valve can be cleaned and the gas inside the valve can be replaced by purging gas; the purge port is arranged opposite to the outlet, and a purge valve is provided on the purge port.

[0019] The beneficial technical effects of the present utility model are as follows:

[0020] By designing a conical sealing surface, the valve core and the housing can be closely fitted; and compared with other sealing surface structures, the conical sealing surface causes less loss to the sealing structure, enabling high reliability under multiple operations. Through the pantograph seal structure, compared with the traditional sealing structure, the pantograph seal has more excellent sealing performance under high pressure, ensuring reliable sealing performance of the valve under high and low temperature medium conditions. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a sectional view of the closed state of the angle stop valve provided by the present invention.

[0023] Figure 2 It is a half-sectional view of another angle of the closed state of the angle stop valve provided by the present invention.

[0024] Figure 3 It is a sectional view of the open state of the angle stop valve provided by the present invention.

[0025] Figure 4 It is a half-sectional view of another angle of the open state of the angle stop valve provided by the present invention.

[0026] Explanation of the markings in the figures:

[0027] 1 - Housing; 2 - Valve core; 3 - Conical sealing surface; 4 - Inlet; 5 - Outlet; 6 - Sealing port; 7 - Control port; 8 - Piston; 9 - Control cavity; 10 - First pantograph seal; 11 - Second pantograph seal; 12 - Spring; 13 - Spring seat; 14 - Nozzle; 15 - Exhaust port; 16 - Guide hole; 17 - Blow-off port. Detailed Embodiments

[0028] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0029] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Please refer to Figure 1 、 Figure 3 the angle stop valve shown in the figure, which includes a housing 1, a valve core 2 and a piston 8. An inlet 4 and an outlet 5 are provided on the housing 1. A sealing port 6 is provided at the through - connection of the inlet 4 and the outlet 5. The valve core 2 is installed in the sealing port 6, and the piston 8 is installed at the bottom of the valve core 2. A conical sealing surface 3 for cooperating with the sealing port 6 is provided at the upper end of the valve core 2. A control chamber 9 is formed by enclosing the lower ends of the housing 1, the valve core 2 and the piston 8. The piston 8 is in close fit with the side wall of the control chamber 9. A spring 12 is provided above the piston 8. The spring 12 can be compressed as the piston 8 moves upward, and under the action of the elastic force, the piston 12 is reset. A spring seat 13 is provided at the upper end of the spring 12, and the spring seat 13 is connected to the top of the control chamber 9 by threads. The piston 8 can move up and down relative to the housing 1 through the control chamber 9, and then drive the valve core 2 to move up and down relative to the sealing port 6, realizing the opening and closing of the sealing port 6 and the conical sealing surface 3. A first pantograph seal 10 is provided in the space enclosed by the top of the spring seat 13, the housing 1 and the valve core 2. The first pantograph seal 10 is in close fit with the top of the spring seat 13, the housing 1 and the valve core 2. A through - hole is provided at the bottom of the housing 1, and the bottom of the piston 8 can be supplied with gas through the through - hole, so as to adjust the pressure of the control chamber 9, and further control the up - and - down movement of the piston 8.

[0033] The working principle of the angle stop valve in this embodiment is as follows: The medium enters from the inlet 4. By supplying air to the through-hole, the pressure at the bottom of the piston 8 increases, prompting the piston 8 to move upward and compressing the spring 12. At this time, the valve core 2 moves upward under the action of the piston 8, and the conical sealing surface 3 leaves the sealing port 6, and the medium can flow out from the outlet 5 through the sealing port 6. When the valve is to be closed, the air supply to the through-hole is stopped. Under the elastic action of the spring 12, the piston 8 drives the valve core 2 to move downward, so that the conical sealing surface 3 fits tightly with the sealing port 6 to complete the closing of the valve.

[0034] In a specific embodiment, a valve core guiding hole 16 is provided in the housing 1; the valve core guiding hole 16 is located above the control cavity 9; the valve core 2 is arranged in the valve core guiding hole 16; the valve core guiding hole 16 can realize the positioning and guiding of the valve core 2, and further ensure the tight fit of the conical sealing surface 3 and the sealing port 6.

[0035] In a specific embodiment, a second lip seal 11 is provided between the through-hole and the piston 8, which can further optimize the sealing effect of the control cavity 9, thereby optimizing the sealing effect of the angle stop valve.

[0036] In a specific embodiment, a purge port 17 is further provided on the housing 1. The purge port 17 is connected with a purge mechanism, and the valve can be cleaned and the gas in the valve can be replaced by the purge gas; the purge port 17 is arranged opposite to the outlet 5, and a purge valve is provided on the purge port 17. When the valve is opened, the purge valve is in a closed state.

[0037] In a specific embodiment, it further includes a nozzle 14. The lower end of the housing 1 is sleeved in the nozzle 14; a control port 7 is provided on the nozzle 14, and the control port 7 is communicated with the through-hole.

[0038] Please continue to refer to Figure 2 、 Figure 4 , in a specific embodiment, an exhaust port 15 is further provided on the housing 1. The exhaust port 15 is communicated with the control cavity 9, and the redundant gas in the valve can be discharged to ensure that the internal structure of the valve will not be blocked and avoid the influence of additional forces on the movement of the valve core. A check valve is provided in the exhaust port 15, and the check valve is a one-way valve, which can discharge the redundant gas while preventing the outside gas from entering the valve.

[0039] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An angle stop valve, comprising a housing, a valve core and a piston, wherein the housing is provided with an inlet and an outlet, a sealing port is provided at the through-hole between the inlet and the outlet, the valve core is installed in the sealing port, and the piston is installed at the bottom of the valve core, characterized in that: The upper end of the valve core is provided with a conical sealing surface that matches the sealing port; the housing, the lower end of the valve core and the piston enclose a control chamber, and the piston is tightly fitted with the side wall of the control chamber; the piston can move up and down relative to the housing through the control chamber, thereby driving the valve core to move up and down relative to the sealing port, thereby realizing the opening and closing of the sealing port and the sealing surface; a first flood plug is provided on the top of the control chamber.

2. The angle stop valve according to claim 1, characterized in that: A valve core guide hole is provided in the shell; the valve core guide hole is located above the control cavity; the valve core is arranged in the valve core guide hole; the valve core guide hole can realize the positioning and guiding of the valve core.

3. The angle stop valve according to claim 1, characterized in that: The bottom of the shell is provided with a through hole, through which air can be supplied to the bottom of the piston to adjust the pressure of the control chamber, thereby controlling the up and down movement of the piston.

4. The angle stop valve according to claim 3, characterized in that: A spring is arranged above the piston, and the spring can be compressed as the piston moves upward, and reset the piston when the through hole stops supplying air to the bottom of the piston.

5. The angle stop valve according to claim 4, characterized in that: A spring seat is arranged on the top of the control chamber, and the spring is installed on the spring seat; the first flood plug is arranged in a space enclosed by the spring seat, the housing and the valve core.

6. The angle stop valve according to claim 5, characterized in that: The spring seat is installed on the control chamber through threads and can be tightly connected with the first pan plug.

7. The angle stop valve according to claim 6, characterized in that: A second flood plug is provided between the through hole and the piston.

8. The angle stop valve according to claim 7, characterized in that: The shell is also provided with an exhaust port, which is communicated with the control chamber and can exhaust the excess gas in the valve; and an exhaust valve is provided on the exhaust port.

9. The angle stop valve according to claim 8, characterized in that: It also includes a pipe connection nozzle, in which the lower end of the shell is sleeved; a control port is provided on the pipe connection nozzle, and the control port is communicated with the through hole.

10. The angle stop valve according to any one of claims 1 to 9, characterized in that: The shell body is also provided with a blow-off port, and the blow-off port is connected with a blow-off mechanism; the blow-off port is arranged opposite to the outlet, and a blow-off valve is provided on the blow-off port.

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