Air suction control mechanism

Abstract

The invention belongs to a life support system of a manned aircraft, and particularly relates to an air suction control mechanism. The shell is a cylinder with two open ends, and an air inlet is formed in the side wall of the shell; the valve seat is in threaded connection with the opening in the left end of the shell, a left-middle-right three-stage stepped hole is formed in the valve seat, the diameter of the middle hole is the smallest, and the left hole is provided with an air outlet; the corrugated pipe assembly is installed in the shell, and a stud at the right end of the corrugated pipe assembly penetrates out of an opening in the right end of the shell; a connecting piece is arranged at the left end of the corrugated pipe assembly and provided with two-stage stepped holes. The nut is screwed on the stud and is used for locking the corrugated pipe; the adjusting screw is a three-stage step column, and the small-diameter section of the adjusting screw is in threaded connection with the small-diameter hole of the connecting piece; the diameter of an inner hole of the valve is smaller than the outer diameter of the large-diameter section of the adjusting screw; the first spring is arranged between the connecting piece and the valve and used for pressing the valve on the end face of the right hole of the valve seat.

Description

Technical Field

[0001] This invention pertains to life support systems for manned aircraft, specifically relating to an air intake control mechanism. Background Technology

[0002] In life support systems, oxygen concentration needs to increase accordingly with flight altitude. Currently, there is no suitable oxygen concentration control mechanism to meet the oxygen supply needs of pilots at different flight altitudes. Therefore, there is an urgent need for an air intake control mechanism to regulate oxygen concentration and ensure pilot safety at various altitudes. Summary of the Invention

[0003] Purpose of the invention: To provide an air intake control mechanism for pilots to precisely control the oxygen concentration in the breathing chamber of the oxygen supply regulator.

[0004] Technical solution: An air intake control mechanism, comprising: The shell is a cylindrical body with openings at both ends and air inlets on the side walls; The valve seat is screwed to the opening at the left end of the housing. The valve seat has three stepped holes in the left, middle and right. The middle hole has the smallest diameter and the left hole has an air outlet. The bellows assembly is installed inside the housing, with the stud on the right end of the bellows assembly protruding from the opening on the right end of the housing; the left end of the bellows assembly is a connector with two-stage stepped holes. Nuts are screwed onto studs to lock the bellows in place; The adjusting screw is a three-stage stepped pin, with the small-diameter section screwed into the small-diameter hole of the connector. The valve is fitted onto the adjusting screw, and its inner diameter is smaller than the outer diameter of the large diameter section of the adjusting screw. Spring 1 is located between the connector and the valve, and is used to press the valve against the right end face of the valve seat.

[0005] Furthermore, the bellows senses changes in air pressure, and these changes cause the bellows to expand and contract, thereby controlling the opening and closing of the valve.

[0006] Furthermore, an adjusting shim is provided axially between the adjusting screw and the connector.

[0007] Furthermore, the preload of spring one is adjusted by adjusting the thickness of the adjusting shim, thereby adjusting the pressure for opening the valve.

[0008] Furthermore, the structure also includes: a one-way valve, which is pressed against the left side of the central hole of the valve seat by a second spring; Furthermore, the mechanism shown also includes a bracket, located at the leftmost end of the valve seat, for fixing the second spring.

[0009] Furthermore, the preload of spring two is less than that of spring one.

[0010] Furthermore, the inner diameter of the valve is smaller than the outer diameter of the large-diameter section of the adjusting screw.

[0011] Beneficial effects: The air intake control mechanism designed in this invention senses changes in altitude through a bellows and controls the opening amount of the valve to provide the pilot with mixed oxygen of corresponding oxygen concentration at different flight altitudes.

[0012] The air intake control mechanism can control the opening of the valve according to the flight altitude, thereby controlling the amount of air entering the product. The pure oxygen source inside the product mixes with different amounts of air to provide the pilot with mixed oxygen of the corresponding oxygen concentration at the flight altitude, ensuring the pilot's flight safety. Attached Figure Description

[0013] Figure 1 This is a functional principle diagram of an air intake control mechanism according to the present invention.

[0014] Figure 2 This is an external view of an air intake control mechanism according to the present invention.

[0015] Wherein: 1-bracket; 2-spring; 3-one-way valve; 4-valve seat; 5-housing; 6-valve; 7-spring; 8-adjusting screw; 9-adjusting shim; 10-bellows; 11-nut. 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 embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] See Figure 1 and Figure 2 An air intake control mechanism includes a bracket 1; a spring 2; a one-way valve 3; a valve seat 4; a housing 5; a valve 6; a spring 7; an adjusting screw 8; an adjusting shim 9; a bellows 10; and a nut 11.

[0021] Among them, bracket 1 is used to fix spring 2, spring 2 controls the opening and closing of one-way valve 3, one-way valve 3 and valve seat 4 cooperate to form one-way valve, the function of one-way valve is to prevent mixed oxygen from flowing back into the cabin.

[0022] The housing 5 is used for the installation and fixing of other parts. The valve 6 and the valve seat 4 cooperate to form a mixing oxygen valve. The spring 7 controls the opening and closing of the valve 6. The adjusting screw 8 installs the valve 6 on the bellows 10. The adjusting shim 9 controls the opening force of the valve 6. The bellows 10 senses the change in air pressure. The nut 11 fixes the housing 5 and the bellows 10.

[0023] The housing 5 ensures the entry and circulation of air.

[0024] The opening force of the valve 6 is controlled by the spring 7, the adjusting screw 8 and the adjusting shim 9, so that the opening force of the valve is controlled within the required range.

[0025] One-way valve 3 ensures that the mixed oxygen gas will not flow back into the cabin.

[0026] The opening and closing of the one-way valve 3 is ensured by spring 2.

[0027] The bellows 10 senses the air pressure changes caused by flight altitude. The air pressure changes caused by altitude changes will cause the bellows 10 to lengthen, thereby controlling the opening of the valve 6 and providing the pilot with mixed oxygen with corresponding oxygen concentrations at different flight altitudes.

[0028] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air intake control mechanism, characterized in that, include: The shell is a cylindrical body with openings at both ends and air inlets on the side walls; The valve seat is screwed to the opening at the left end of the housing. The valve seat has three stepped holes in the left, middle and right. The middle hole has the smallest diameter and the left hole has an air outlet. The bellows assembly is installed inside the housing, with the stud on the right end of the bellows assembly protruding from the opening on the right end of the housing; the left end of the bellows assembly is a connector with two stepped holes. Nuts are screwed onto studs to lock the bellows in place; The adjusting screw is a three-stage stepped pin, with the small-diameter section screwed into the small-diameter hole of the connector. The valve is fitted onto the adjusting screw; Spring 1 is located between the connector and the valve, and is used to press the valve against the right end face of the valve seat.

2. The air intake control mechanism according to claim 1, characterized in that: The bellows senses changes in air pressure, and these changes cause the bellows to expand and contract, thus controlling the opening and closing of the valve.

3. The air intake control mechanism according to claim 1, characterized in that: An adjusting shim is provided axially between the adjusting screw and the connector.

4. The air intake control mechanism according to claim 1, characterized in that: The preload of spring one is adjusted by adjusting the thickness of the adjusting shim, thereby adjusting the pressure for opening the valve.

5. The air intake control mechanism according to claim 1, characterized in that: The structure also includes a one-way valve, which is pressed against the left side of the central hole of the valve seat by a spring.

6. The air intake control mechanism according to claim 5, characterized in that: The preload of spring 2 is less than that of spring 1.

7. The air intake control mechanism according to claim 6, characterized in that: The mechanism shown also includes a bracket, located at the leftmost end of the valve seat, for fixing the second spring.

8. The air intake control mechanism according to claim 1, characterized in that: The inner diameter of the valve is smaller than the outer diameter of the large diameter section of the adjusting screw.

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