A line ported safety valve mechanism

Abstract

The utility model belongs to aircraft oxygen overpressure protection technology relates to a kind of pipeline interface type safety valve mechanism. Including: shell, it is cylindrical structure, lower end is equipped with valve seat, upper end opening;Valve assembly, it is set on valve seat, middle part is equipped with air hole;Thimble, it is set on valve assembly;Spring, one end is sleeved on thimble, the other end is sleeved on lock screw;Lock screw is screwed in shell;Connecting mouth is fixed in shell upper end opening place by screw.

Description

Technical Field

[0001] This utility model relates to aircraft oxygen overpressure protection technology, specifically a pipeline interface type safety valve mechanism. Background Technology

[0002] Aircraft oxygen pressure regulators typically incorporate a safety valve mechanism to release high-pressure oxygen and protect downstream low-pressure components when pressure exceeds tolerance. Generally, aircraft oxygen overpressure protection releases oxygen into the pressure regulator's chamber, thus limiting the regulator's installation location on the aircraft. To prevent oxygen from venting into the chamber, traditional safety valve structures are insufficient. A novel safety valve structure is needed to release overpressure oxygen outside the aircraft. This pipeline-interface type safety valve mechanism allows overpressure oxygen to be released outside the aircraft via a pipeline. Utility Model Content

[0003] Purpose of the utility model: To provide a pipeline interface type safety valve mechanism to release oxygen that has exceeded the pressure reduction limit of the pressure regulator to the outside of the machine.

[0004] Technical solution: A pipeline interface type safety valve mechanism, comprising: The shell is a cylindrical structure with a valve seat at the lower end and an opening at the upper end; A valve assembly is mounted on a valve seat; A ejector pin is installed on the valve assembly; The spring has one end fitted onto the ejector pin and the other end fitted onto the locking screw; The locking screw is screwed into the housing; The connector is fixed to the opening at the top of the housing with screws.

[0005] Furthermore, the mechanism also includes: a locking ring; The locking ring is screwed into the housing and located above the locking screw to prevent the locking screw from loosening.

[0006] Furthermore, the upper surface of the valve assembly is funnel-shaped, and the cone inclination angle ranges from 30° to 60°.

[0007] Furthermore, the lower end of the ejector pin is conical, and the taper size matches the conical surface of the upper surface of the valve assembly.

[0008] Furthermore, the middle part of the ejector pin is a first cylinder, and the upper part of the ejector pin is a second cylinder with a smaller diameter than the middle part. The spring is sleeved on the second cylinder on the upper part of the ejector pin.

[0009] Furthermore, the valve assembly includes a valve housing and rubber material; The valve housing has a columnar structure with a funnel-shaped upper surface and a blind hole on the lower surface. The rubber material is vulcanized in the blind holes.

[0010] Furthermore, the diameter of the blind hole is larger than the diameter of the valve seat; the valve assembly contacts the valve seat through a rubber material.

[0011] Furthermore, the rubber material is 3180T.

[0012] Beneficial effects: This invention provides a pipeline interface type safety valve mechanism to prevent overpressure oxygen from being released into the chamber. This invention has a simple structure and high reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the principle structure of this utility model.

[0014] The symbols in the diagram are: 1. Connector; 2. Screw; 3. Washer; 4. Locking ring; 5. Locking screw; 6. Spring; 7. Ejector pin; 8. Valve assembly; 9. Housing.

[0015] Figure 2 This is a schematic diagram of the valve assembly in this utility model. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0017] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0018] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Valve assembly 8 is composed of 3180T rubber material and valve housing. See the overall part view below. Figure 2 The cylindrical surface can fit into the housing 9, that is, it is installed into the housing 9.

[0021] The conical end face of the ejector pin 7 can be fitted into the conical surface of the valve assembly 8. The other end of the ejector pin 7 is cylindrical, which is fitted into the lower end of the spring 6 (a common cylindrical helical spring).

[0022] The upper end of spring 6 is fitted into the hole on locking screw 5 to ensure the guidance of spring 6. Locking screw 5 is screwed into housing 9 by threads, and locking ring 4 is also screwed into housing 9 by threads to prevent loosening. The opening pressure of safety valve is adjusted by adjusting the degree to which locking screw 5 is screwed into housing 9. Connector 1 is fixed to housing 9 by four screws 2, and airtightness is achieved by pressing gasket 3. Connector 1 is designed and manufactured according to HB 4-3 standard. After being tightened with corresponding pipe fittings, it forms a channel for output to the outside of the machine through a pipe.

[0023] Under normal operating conditions, valve assembly 8 is in contact with the valve seat of housing 9. The spring force ensures that, under certain pressure, valve assembly 8 and the valve seat of housing 9 remain in contact, preventing gas leakage from housing 9. Under abnormal operating conditions, if the pressure is too high, the spring force is insufficient to maintain contact between valve assembly 8 and the valve seat of housing 9. Gas then flows through the gap to connector 1 and is ultimately output to the outside of the machine via pipeline.

[0024] If the pressure in the pressure-reducing chamber is normal, the safety valve will be closed under the action of the spring force, and gas will not leak from the safety valve.

[0025] If the pressure in the pressure-reducing chamber exceeds the specified value, the safety valve will be subjected to a pressure higher than the spring force, causing the valve to open and the gas in the pressure-reducing chamber to be released through the nozzle and eventually to the outside of the machine.

[0026] The above description is merely a specific embodiment of this utility model, providing a detailed description of the utility model. Parts not covered in detail are conventional techniques. However, the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pipeline interface type safety valve mechanism, characterized in that: include: The shell is a cylindrical structure with a valve seat at the lower end and an opening at the upper end; A valve assembly is mounted on a valve seat; A ejector pin is installed on the valve assembly; The spring has one end fitted onto the ejector pin and the other end fitted onto the locking screw; The locking screw is screwed into the housing; The connector is fixed to the opening at the top of the housing with screws.

2. The mechanism according to claim 1, characterized in that: The mechanism also includes: a locking ring; The locking ring is screwed into the housing and located above the locking screw to prevent the locking screw from loosening.

3. The mechanism according to claim 2, characterized in that: The upper surface of the valve assembly is funnel-shaped, and the inclination angle of the cone surface ranges from 30° to 60°.

4. The mechanism according to claim 3, characterized in that: The lower end of the ejector pin is conical, and the taper size matches the conical surface of the upper surface of the valve assembly.

5. The mechanism according to claim 4, characterized in that: The middle part of the ejector pin is a first cylinder, and the upper part of the ejector pin is a second cylinder with a smaller diameter than the middle part. The spring is sleeved on the second cylinder on the upper part of the ejector pin.

6. The mechanism according to claim 5, characterized in that: The valve assembly includes the valve body and rubber material; The valve housing has a columnar structure with a funnel-shaped upper surface and a blind hole on the lower surface. The rubber material is vulcanized in the blind holes.

7. The mechanism according to claim 6, characterized in that: The diameter of the blind hole is larger than the diameter of the valve seat; the valve assembly contacts the valve seat through rubber material.

8. The mechanism according to claim 7, characterized in that: The rubber material is 3180T.

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