A pressure control mechanism varying with height

Abstract

The utility model belongs to aircraft oxygen system relates to a pressure control mechanism with altitude variation. Including: casing is equipped with bellows cavity, bellows cavity one end is connected through A channel and is communicated with cabin, the other end is communicated with pressure chamber through B channel, flow control mouth, install in pressure chamber, lower end is communicated with gas source, upper end is communicated with pressure chamber through nozzle, pressure plate, set up in pressure chamber, one end is contacted with casing, the other end is placed above B channel, reed, card in pressure plate, diaphragm, install on reed, under the pressure action of reed, close and seal flow control mouth, bellows, install in bellows cavity, rubber piece, one end is connected with bellows, the other end is connected with pressure plate, bellows senses air pressure change, lengthen and push rubber piece when pressure reduces and lift pressure plate, close B channel simultaneously, pressure plate drives reed and diaphragm to be far away from flow control mouth, and flow control mouth sprays gas and establishes pressure in pressure chamber.

Description

Technical Field

[0001] The utility model belongs to the aircraft oxygen system, and relates to a pressure control mechanism varying with altitude. Background Art

[0002] The core of the pressure oxygen supply system for pilot masks is active pressurized oxygen supply for the high-altitude low-pressure and oxygen-deficient environment. Current pressurized oxygen supply equipment has a complex structure and heavy weight, which increases the pilot's load and discomfort, and is cumbersome to wear, slow in response speed, high in cost and complex in maintenance, so it is not suitable for civil airliners. There is an urgent need for a pressurized oxygen supply system for civil aircraft, which takes rapid response to short-term positive pressure as the core, gives consideration to operation convenience, and adapts to the flight altitude and technical specifications of civil aviation. Contents of the Utility Model

[0003] Purpose of the utility model: to provide a pressure control mechanism varying with altitude, which is applied in the mask of an aircraft oxygen system, so that one mask can meet the pressurization requirements at different altitudes.

[0004] Technical Solution: A pressure control mechanism varying with altitude, comprising: a housing, provided with a bellows chamber, one end of the bellows chamber communicating with the cockpit through a passage A, and the other end communicating with a pressure chamber through a passage B; a flow control nozzle, installed in the pressure chamber, with the lower end communicating with an air source, and the upper end communicating with the pressure chamber through a nozzle; a pressing plate, arranged in the pressure chamber, with one end in contact with the housing and the other end placed above the passage B; a reed, clamped on the pressing plate; a diaphragm, installed on the reed, which is pressed by the reed to fit tightly and seal the flow control nozzle; a bellows, installed in the bellows chamber; a rubber part, with one end connected to the bellows and the other end connected to the pressing plate; The bellows senses the change of air pressure, extends when the pressure decreases to push the rubber part to jack up the pressing plate, and seals the passage B at the same time. The pressing plate drives the reed and the diaphragm to move away from the flow control nozzle, so that the flow control nozzle ejects gas in the pressure chamber to build up pressure.

[0005] Further, the rubber part is a rotating 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 is in point-surface contact with the housing to seal the passage B.

[0006] Further, the device further comprises: a manual pressurization switch, which is manually operated to seal the passage A.

[0007] Further, the pressing plate is in a zigzag shape.

[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 utilizes the characteristics of a bellows sensing element, 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 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.

[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 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 pressure control mechanism that varies with altitude, characterized in that, comprising: a housing (5), provided with a bellows chamber, one end of the bellows chamber communicating with the cockpit via a passage A, and the other end communicating with a pressure chamber via a passage B; a flow control nozzle (6), mounted in the pressure chamber, with a lower end communicating with an air source, and an upper end communicating with the pressure chamber via a jet orifice; a pressure plate (4), arranged in the pressure chamber, with one end in contact with the housing, and the other end disposed above the passage B; a reed (3), clamped on the pressure plate; a diaphragm (2), mounted on the reed, and being pressed against and closing the flow control nozzle under the pressure action of the reed; a bellows (8), mounted in the bellows chamber; a rubber member (7), with one end connected to the bellows, and the other end connected to the pressure plate; the bellows senses air pressure changes, and extends to push the rubber member to jack up the pressure plate when the pressure decreases, while closing the passage B, the pressure plate drives the reed and the diaphragm away from the flow control nozzle, and the flow control nozzle ejects gas into the pressure chamber (1) to build up pressure.

2. The apparatus according to claim 1, characterized in that, the rubber member 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 having a triangular cross section, which closes the passage B through point-surface contact with the housing.

3. The apparatus according to claim 2, characterized in that, the apparatus further comprises: a manual pressurization switch, which is manually operated to close the passage A.

4. The apparatus according to claim 3, characterized in that, the pressure plate is in a shape of a Chinese character "几".

5. The apparatus according to claim 4, characterized in that, a jack-up through hole is provided below the end of the pressure plate away from the passage B, a jack-up rod is provided below the jack-up through hole; the pressure plate is manually jacked up by the jack-up rod to open the flow control nozzle.

6. The apparatus according to claim 5, characterized in that, the jack-up rod is located above the manual pressurization switch, and is driven together by the manual pressurization switch.

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

8. The apparatus according to claim 7, characterized in that, gas at 0.4 MPa is present inside the flow control nozzle.

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