Flow control device

Abstract

The invention belongs to the technical field of flow fine adjustment control of an aircraft oxygen system, and relates to a flow control device which comprises a shell which is a barrel with two open ends, a partition plate is arranged in the middle to divide the interior of the shell into an upper cavity and a lower cavity, an air inlet is formed in the upper cavity, an air outlet is formed in the lower cavity, and a center through hole is formed in the center of the partition plate; the partition plate is provided with a plurality of main air holes around the central through hole; the lower cover plate seals the lower end opening of the shell, and the upper end face of the lower cover plate is provided with a short cylinder; the lower end of the spring sleeves the short cylinder; a lower-end column body sleeves the upper end of the spring, and an upper-end ball head seals the lower end face of the central through hole under the action of the spring; the upper cover seals the upper end opening of the shell; the lower-end valve plate is arranged above the partition plate, covers the main air hole and is provided with an air channel for communicating the side wall of the valve plate with the center of the lower end surface of the valve plate, so that the upper cavity is communicated with the central through hole when the push rod valve falls down; the upper end push rod penetrates through the upper cover.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fine adjustment control of aircraft oxygen system flow, and relates to a flow control device. BACKGROUND

[0002] The crew oxygen mask headband design technology is one of the core designs of the mask, and the core goal is to achieve rapid, stable and comfortable wearing in an emergency situation while ensuring that the mask air tightness meets the performance requirements. Modern crew oxygen masks usually use an inflatable structure. The user pinches the inflation button, and oxygen inflates into the headband to make it quickly expand, which is convenient for the head. After releasing the button, the oxygen will be quickly discharged, and the headband will instantly shrink and tighten the head. Under the action of the headband, the mask and the face form a close fit. Although the cushion can relieve the pressure, if worn for a long time, for example, in the case of wearing a flight for a long time, the headband will cause discomfort due to the tightness of the head and the inability to adjust. SUMMARY

[0003] The purpose of the present application is to provide a flow control device that can selectively slowly inflate and maintain the headband after the mask completes the fast wearing function, making the wearing comfortable.

[0004] TECHNICAL SCHEME A flow control device, comprising: A shell is a cylinder with open ends, and a partition is provided in the middle to divide the shell into two chambers, an upper chamber and a lower chamber. The upper chamber is provided with an air inlet hole, and the lower chamber is provided with an air outlet hole. A center through hole is provided in the center of the partition, and a plurality of main air holes are provided around the center through hole of the partition; A lower cover plate seals the lower end opening of the shell, and a short cylinder is provided on the upper end face of the lower cover plate; A spring is sleeved on the upper end of the short cylinder; A ball head valve is sleeved on the lower end of the spring, and the upper end ball head closes the lower end face of the center through hole under the action of the spring; An upper cover seals the upper end opening of the shell; A push rod valve is provided above the partition, covering the main air holes, and the valve plate is provided with an air passage connecting the side wall of the valve plate and the center of the lower end face of the valve plate, so that the upper chamber and the center through hole are connected when the push rod valve falls; the upper end of the push rod passes through the upper cover.

[0005] Further, a sealing ring is provided between the upper end of the push rod valve and the upper cover.

[0006] Further, a rubber pad is bonded to the lower end face of the lower end valve plate of the push rod valve.

[0007] Further, the air passage in the valve plate includes a radial through hole and an axial through hole; The radial through hole penetrates the valve plate in the diameter direction of the valve plate; The axial through hole communicates the lower end surface of the valve plate with the radial through hole.

[0008] Further, the minimum cross-sectional area inside the push rod valve gas path is less than the cross-sectional area of the center through hole of the partition plate. The minimum cross-sectional area inside the gas path meets the slow inflation requirement and can inflate the headband with appropriate pressure. The total cross-sectional area of the main gas hole meets the requirement of rapid wearing, and can inflate the headband to the maximum size within 2 seconds.

[0009] Further, the spring pre-tightening force can make the ball head valve seal while being less than the pressure provided by the upper end of the ball head valve during gas supply, so that the ball head valve can be opened sensitively.

[0010] Advantages: The application provides a flow control device, which adds a flow fine adjustment control device on the basis of the original rapid wearing function, and solves the problem of discomfort during long-term wearing of the head. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic view of a flow control device. DETAILED DESCRIPTION

[0012] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0013] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0014] In addition, the terms "mounting", "setting", "provided with", "connection", "connected", "sleeved" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0016] A flow control mechanism, on the basis of the original quick wearing function, increases a flow fine adjustment control device, and after quick wearing, wearing comfort is realized by slowly filling oxygen into a headband.

[0017] Specifically includes: sealing ring 1, upper cover 2, push rod valve 3, shell 4, rubber pad 5, ball head valve 6, spring 7, lower cover plate 8.

[0018] The shell is a cylinder with both ends open, and a partition plate is arranged in the middle to divide the shell into upper and lower cavities. The upper cavity is provided with an air inlet hole, and the lower cavity is provided with an air outlet hole. A central through hole is arranged in the center of the partition plate, and a plurality of main air holes are arranged around the central through hole of the partition plate. The lower cover plate seals the lower end opening of the shell, and the upper end face of the lower cover plate is provided with a short cylinder. The spring is sleeved on the short cylinder at the lower end. The ball head valve is sleeved on the upper end of the spring, and the lower end of the ball head is closed under the action of the spring. The upper cover seals the upper end opening of the shell. The lower end valve plate of the push rod valve is arranged above the partition plate and covers the main air holes. The valve plate is provided with an air passage connecting the side wall of the valve plate and the center of the lower end face of the valve plate, so that the upper cavity and the central through hole are communicated when the push rod valve falls. The upper end of the push rod passes through the upper cover.

[0019] A sealing ring is arranged between the upper end of the push rod valve and the upper cover.

[0020] The lower end face of the lower end valve plate of the push rod valve is bonded with the rubber pad.

[0021] The air passage in the valve plate includes a radial through hole and an axial through hole. The radial through hole penetrates the valve plate in the diameter direction of the valve plate. The axial through hole connects the lower end face of the valve plate and the radial through hole.

[0022] The minimum cross-sectional area of the air passage inside the push rod valve is smaller than the cross-sectional area of the central through hole of the partition plate. The minimum cross-sectional area of the air passage inside meets the slow inflation needs and can fill the headband with appropriate pressure gas. The total cross-sectional area of the main air holes meets the quick wearing needs and can inflate the headband to the maximum size within 2 seconds.

[0023] The spring pre-tightening force can seal the ball head valve, and is less than the pressure given to the upper end of the ball head valve when gas is supplied, so that the ball head valve can be sensitively opened.

[0024] The working principle is as follows: gas is supplied from the A end, the push rod valve 3 is opened, the gas is supplied to the B end through the passage in the shell 4, and the rapid gas supply function is realized; when the A end stops supplying gas, the gas is exhausted from the A end in the reverse direction through the passage in the shell 4; conversely, the push rod valve 3 is closed, the gas passes through the flow limiting hole in the push rod valve 3 and the passage in the shell 4, pushes the ball head valve 6 to open against the elastic force of the spring 7, and slowly supplies gas to the B end; when the A end stops supplying gas, the gas cannot be exhausted under the sealing action of the sealing ring 5 and the ball head valve 6, and a certain pressure is maintained at the B end.

[0025] The above is only a specific embodiment of the present application, and the present application is described in detail, and the part not described in detail is a conventional technology. However, the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flow control device, characterized by, The utility model relates to a headband inflation device, comprising: a shell, which is a cylinder open at both ends, and is provided with a partition plate in the middle to divide the shell into an upper chamber and a lower chamber, the upper chamber is provided with an air inlet, the lower chamber is provided with an air outlet, the center of the partition plate is provided with a center through hole, and the partition plate is provided with a plurality of main air holes around the center through hole; a lower cover plate, which seals the lower end opening of the shell, and is provided with a short cylinder on the upper end surface; a spring, which is sleeved on the lower end of the short cylinder; a ball head valve, which is sleeved on the upper end of the spring, and the lower end cylinder is sealed by the upper end ball head under the action of the spring; an upper cover, which seals the upper end opening of the shell; a push rod valve, which is placed above the partition plate and covers the main air holes, and is provided with an air path connecting the side wall and the center of the lower end surface of the valve plate, so that the upper chamber and the center through hole are communicated when the push rod valve falls; the upper end of the push rod valve penetrates through the upper cover.

2. The apparatus of claim 1, wherein: A sealing ring is arranged between the upper end of the push rod valve and the upper cover.

3. The apparatus of claim 1, wherein: The lower end surface of the lower end valve plate of the push rod valve is bonded with a rubber pad.

4. The apparatus of claim 1, wherein: The air path in the valve plate includes a radial through hole and an axial through hole; The radial through hole penetrates the valve plate along the diameter direction of the valve plate; The axial through hole connects the lower end surface of the valve plate and the radial through hole.

5. The apparatus of claim 4, wherein: The minimum cross-sectional area of the air path inside the push rod valve is smaller than the cross-sectional area of the center through hole of the partition plate.

6. The apparatus of claim 5, wherein: The minimum cross-sectional area of the air path inside the push rod valve meets the slow inflation requirement and can charge the headband with gas in the threshold pressure range.

7. The apparatus of claim 5, wherein: The total cross-sectional area of the main air holes meets the fast wearing requirement and can inflate the headband to the maximum size within 2 seconds.

8. The apparatus of claim 5, wherein: The spring pre-tightening force is used to seal the ball head valve, and the spring pre-tightening force is smaller than the gas supply pressure when the gas is supplied.

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