Pressure control mechanism changing along with height

Abstract

The invention belongs to an aircraft oxygen system, and relates to a pressure control mechanism changing along with height. Comprising a shell provided with a corrugated pipe cavity, one end of the corrugated pipe cavity is communicated with a cabin through a channel A, and the other end is communicated with a pressure cavity through a channel B; the lower end of the flow control nozzle is communicated with an air source, and the upper end of the flow control nozzle is communicated with the pressure cavity through a nozzle; the pressing plate is arranged in the pressure cavity, one end of the pressing plate is contacted with the shell, and the other end is arranged above the channel B; the reed is clamped on the pressing plate; the diaphragm is mounted on the reed and clings to and seals the flow control nozzle under the pressure action of the reed; the corrugated pipe is mounted in the corrugated pipe cavity; one end of the rubber part is connected with the corrugated pipe and the other end is connected with the pressing plate; the corrugated pipe senses air pressure changes and extends to push the rubber part to jack the pressing plate when the pressure is reduced, meanwhile, the channel B is closed, the pressing plate drives the reed and the diaphragm to be away from the flow control nozzle, and the flow control nozzle sprays out air in the pressure cavity to build pressure.

Description

Technical Field

[0001] The present invention belongs to the aircraft oxygen system and relates to a pressure control mechanism that varies with altitude. Background Art

[0002] For the pressurized oxygen supply system of the pilot's mask, the core is the active pressurized oxygen supply for the high-altitude low-pressure and oxygen-deficient environment. The current pressurized oxygen supply equipment has a complex structure, a large weight, increasing the burden and discomfort of the pilot, and is cumbersome to wear, slow in response speed, high in cost, and complex in maintenance. It is not applicable to civil airliners. There is a need for a pressurized oxygen supply system that meets the requirements of civil aircraft, with the core of quickly responding to short-term positive pressure, taking into account the convenience of operation, and adapting to the flight altitude and technical specifications of civil aviation. Summary of the Invention

[0003] Object of the Invention: To provide a pressure control mechanism that varies with altitude, which is applied inside the mask of the aircraft oxygen system to enable a mask to meet the pressurization requirements at different altitudes.

[0004] Technical Solution: A pressure control mechanism that varies with altitude, comprising: A housing provided with a bellows cavity. One end of the bellows cavity is connected to the cockpit through channel A, and the other end is connected to the pressure chamber through channel B; A flow control nozzle installed in the pressure chamber, with the lower end connected to the gas source and the upper end connected to the pressure chamber through a nozzle; A pressing plate disposed in the pressure chamber, with one end contacting the housing and the other end placed above channel B; A reed clamped on the pressing plate; A diaphragm installed on the reed and tightly attached to and closing the flow control nozzle under the pressure of the reed; A bellows installed in the bellows cavity; A rubber part, with one end connected to the bellows and the other end connected to the pressing plate; The bellows senses the air pressure change. When the pressure decreases, it elongates to push the rubber part to lift the pressing plate, and at the same time closes channel B. The pressing plate带动 the reed and the diaphragm away from the flow control nozzle, and the flow control nozzle ejects gas in the pressure chamber to establish pressure.

[0005] Further, the rubber part is a rotary body with a cross-shaped cross-section; The upper end surface of the middle flat plate is provided with an annular protrusion with a triangular cross-section, which closes channel B by point-surface contact with the housing.

[0006] Further, the device further includes: a manual pressurization switch for manually operating the manual pressurization switch to close channel A.

[0007] Further, the pressing plate is in a shape like a capital "J".

[0008] Furthermore, a lifting through hole is provided below the end of the pressure plate furthest from channel B. A lifting rod is provided below the lifting through hole; Manually lift the pressure plate using the lifting rod to open the flow control nozzle.

[0009] Furthermore, the lifting rod is located above the manual pressure switch, and the lifting rod is driven together by the manual pressure switch.

[0010] Furthermore, the reed is secured in the two mounting slots of the pressure plate by two claws.

[0011] Furthermore, there is 0.4 MPa of gas inside the flow control nozzle.

[0012] Beneficial effects: This invention designs the bellows sensing element based on its characteristics, enabling pressurization at high altitudes without affecting normal operation at low altitudes. Compared to existing technologies, it avoids the inconvenience of manual pressurization and improves product safety. Attached Figure Description Figure 1 This is a schematic diagram of a pressure control mechanism that varies with altitude.

[0013] Figure 2 This is a magnified view of a portion of the membrane area. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] A pressure control mechanism that varies with altitude includes a diaphragm 2, a spring 3, a bellows 8, a rubber component 7, a pressure plate 4, a flow control nozzle 6, and a housing 5.

[0019] A reed is mounted on a diaphragm plate, and the reed is secured in two mounting slots on the pressure plate by two claws for positioning and fixation. The spring force of the reed acts on the diaphragm to seal the flow control nozzle channel, preventing gas leakage. One end of the pressure plate can be manually lifted upwards, while the other end can be opened by pushing it open with the stroke of the bellows. A rubber component is fixed to the center of the bellows to ensure that it does not shift during lifting. The bellows is fixed by a mechanical base, and its initial position can be adjusted by threads, allowing for different relative displacements at different heights to generate different pressurization pressures.

[0020] in: Each component is mounted on the housing and has a gas outflow channel. The bellows is a pressure sensing element that contracts or extends with changes in air pressure. The rubber parts mounted on the bellows provide a force to open the pressure plate as the bellows extends, and gradually close the gas outflow channel in the process, which will increase the pressure inside the cavity.

[0021] The pressure plate acts as a connector, transmitting the force from the rubber component to the spring, which opens the flow control nozzle, which was originally closed by the diaphragm under the elastic force of the spring, allowing air to be supplied into the cavity. The flow control nozzle contains 0.4 MPa of gas.

[0022] This mechanism supplies gas into the cavity while gradually closing the gas outflow channel to achieve the function of high-altitude pressurization.

[0023] 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. A pressure control mechanism that varies with altitude, characterized in that, Comprising: A housing (5) provided with a bellows cavity, one end of the bellows cavity is connected to the cockpit through channel A, and the other end is connected to the pressure chamber through channel B; A flow control nozzle (6) installed in the pressure chamber, with its lower end connected to the gas source and its upper end connected to the pressure chamber through a nozzle; A pressure plate (4) arranged in the pressure chamber, with one end contacting the housing and the other end placed above channel B; A reed (3) clamped on the pressure plate; A diaphragm (2) installed on the reed, and under the pressure of the reed, it closely adheres to and closes the flow control nozzle; A bellows (8) installed in the bellows cavity; A rubber part (7), with one end connected to the bellows and the other end connected to the pressure plate; The bellows senses the air pressure change. When the pressure decreases, it elongates to push the rubber part to lift the pressure plate, and at the same time closes channel B. The pressure plate带动 the reed and the diaphragm away from the flow control nozzle, and the flow control nozzle ejects gas in the pressure chamber (1) to build pressure.

2. The apparatus according to claim 1, characterized in that, The rubber part is a rotary body with a cross-shaped cross-section; On the upper end surface of the middle flat plate, there is an annular protrusion with a triangular cross-section, which closes channel B by point-surface contact with the housing.

3. The apparatus according to claim 2, characterized in that, The device further includes: a manual pressure switch, and manually operating the manual pressure switch closes channel A.

4. The apparatus according to claim 3, characterized in that, The pressure plate is in a shape like the Chinese character 'ji'; 5. The apparatus according to claim 4, characterized in that, Below one end of the pressure plate away from channel B, there is a lifting through hole; Below the lifting through hole, there is a lifting rod; Manually acting on the lifting rod to lift the pressure plate to open the flow control nozzle.

6. The apparatus according to claim 5, characterized in that, The lifting rod is located above the manual pressure switch and is带动 together with the manual pressure switch.

7. The apparatus according to claim 6, characterized in that, The reed is clamped in two installation grooves of the pressure plate by two claws.

8. The apparatus according to claim 7, characterized in that, There is 0.4 Mpa of gas in the flow control nozzle.

Images