A flow control device

Abstract

The utility model belongs to the technical field of aircraft oxygen system flow fine adjustment control, and relates to a flow control device, which comprises: a shell, which is a cylinder with open ends, is provided with a partition plate in the middle to divide the shell into two cavities, the upper cavity is provided with an air inlet hole, the lower cavity is provided with an air outlet hole, 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 face; 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 ball head on the upper end seals the lower end face of the center through hole under the action of the spring; an upper cover, which seals the upper end opening of the shell; a push rod valve, which is arranged above the partition plate with the lower valve plate covering the main air holes, and the valve plate is provided with a gas 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 center through hole are communicated when the push rod valve falls; and the upper end of the push rod passes through the upper cover.

Description

Technical Field

[0001] This utility model belongs to the field of aircraft oxygen system flow fine-tuning control technology, and relates to a flow control device. Background Technology

[0002] The design technology of the oxygen mask headband is one of the core designs of the mask. Its core objective is to achieve quick, secure, and comfortable wearing in emergencies, while ensuring that the mask's airtightness meets performance requirements. Modern crew oxygen mask headbands typically use an inflatable structure. When the user squeezes the inflation button, oxygen fills the headband, causing it to expand rapidly and making it easy to put on the head. When the button is released, the oxygen is quickly expelled, and the headband instantly contracts and tightens around the head, creating a tight fit between the mask and the face. Although padding can relieve pressure, prolonged wear, such as during long-haul flights, can cause discomfort due to the headband's tightness and lack of adjustability. Utility Model Content

[0003] Purpose of the utility model: To provide a flow control device that can selectively and slowly inflate and maintain the headband after the face mask has completed its quick-wearing function, so as to make wearing comfortable.

[0004] Technical solution: A flow control device, comprising: The shell is a cylindrical body with openings at both ends. A partition in the middle divides the interior of the shell into upper and lower chambers. The upper chamber has an air inlet and the lower chamber has an air outlet. The partition has a central through hole and multiple main air holes around the central through hole. The lower cover plate seals the lower opening of the housing, and a short cylinder is provided on the upper surface of the lower cover plate. The spring has its lower end fitted onto a short cylinder. The ball valve has a lower column sleeved on the upper end of a spring, and the upper ball head closes the lower end face of the central through hole under the action of the spring. Top cover, which closes the opening at the top of the shell; The push rod valve has a lower valve plate positioned above the partition, covering the main air vent. The valve plate has 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 connected when the push rod valve falls; the upper push rod passes through the upper cover.

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

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

[0007] Furthermore, the air passage within the valve plate includes radial through holes and axial through holes; The radial through hole penetrates the valve plate along 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.

[0008] Furthermore, the minimum cross-sectional area inside the air passage of the push rod valve is smaller than the cross-sectional area of ​​the central through hole of the partition. The minimum cross-sectional area inside the air passage meets the needs of slow inflation and can fill the headband with gas at an appropriate pressure. The total cross-sectional area of ​​the main air vents meets the needs of rapid wearing, and the headband can be inflated to its maximum size within 2 seconds.

[0009] Furthermore, the spring preload can seal the ball valve while being less than the pressure applied to the upper end of the ball valve during air supply, allowing the ball valve to be opened sensitively.

[0010] Beneficial effects: This invention provides a flow control device that adds a flow fine-tuning control device to the original quick-wearing function, thus solving the problem of head discomfort from prolonged wear. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a flow control device. Detailed Implementation

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] A flow control mechanism adds a flow fine-tuning control device to the original quick-wearing function, so as to achieve wearing comfort by slowly filling the headband with oxygen after quick-wearing.

[0017] Specifically, it includes: 1. Sealing ring; 2. Top cover; 3. Push rod valve; 4. Housing; 5. Rubber pad; 6. Ball head valve; 7. Spring; 8. Bottom cover plate.

[0018] The shell is a cylindrical body with openings at both ends. A partition in the middle divides the interior of the shell into upper and lower chambers. The upper chamber has an air inlet and the lower chamber has an air outlet. The partition has a central through hole and multiple main air holes around the central through hole. The lower cover plate seals the lower opening of the housing, and a short cylinder is provided on the upper surface of the lower cover plate. The spring has its lower end fitted onto a short cylinder. The ball valve has a lower column sleeved on the upper end of a spring, and the upper ball head closes the lower end face of the central through hole under the action of the spring. Top cover, which closes the opening at the top of the shell; The push rod valve has a lower valve plate positioned above the partition, covering the main air vent. The valve plate has 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 connected when the push rod valve falls; the upper push rod passes through the upper cover.

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

[0020] A rubber pad is glued to the lower end face of the lower valve plate of the push rod valve.

[0021] The air passages within the valve plate include radial through holes and axial through holes; The radial through hole penetrates the valve plate along 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 inside the air passage of the push rod valve is smaller than the cross-sectional area of ​​the central through hole of the partition. The minimum cross-sectional area inside the air passage meets the needs of slow inflation and can fill the headband with gas at an appropriate pressure. The total cross-sectional area of ​​the main air vents meets the needs of rapid wearing, and the headband can be inflated to its maximum size within 2 seconds.

[0023] The spring preload ensures the ball valve is sealed, but during air supply, the pressure is less than that applied to the upper end of the ball valve, allowing the ball valve to be opened sensitively.

[0024] The working principle is as follows: When gas is supplied from end A, the push rod valve 3 is opened, and gas is supplied to end B through the inner channel of housing 4, realizing the function of rapid gas supply. When gas supply to end A stops, gas is discharged from end A in the reverse direction through the inner channel of housing 4. Conversely, when the push rod valve 3 is closed, gas is pushed by the flow-limiting hole in the push rod valve 3 and the inner channel of housing 4 to open the ball valve 6 against the elastic force of spring 7, and slowly supply gas to end B. When gas supply to end A stops, under the sealing effect of sealing ring 5 and ball valve 6, gas cannot be discharged, and a certain pressure is maintained at end B.

[0025] 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 flow control device, characterized in that, include: The shell is a cylindrical body with openings at both ends. A partition in the middle divides the interior of the shell into upper and lower chambers. The upper chamber has an air inlet and the lower chamber has an air outlet. The partition has a central through hole and multiple main air holes around the central through hole. The lower cover plate seals the lower opening of the housing, and a short cylinder is provided on the upper surface of the lower cover plate. The spring has its lower end fitted onto a short cylinder. The ball valve has a lower column sleeved on the upper end of a spring, and the upper ball head closes the lower end face of the central through hole under the action of the spring. Top cover, which closes the opening at the top of the shell; The push rod valve has a lower valve plate positioned above the partition, covering the main air vent. The valve plate has 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 connected when the push rod valve falls; the upper push rod passes through the upper cover.

2. The apparatus according to claim 1, characterized in that: A sealing ring is provided between the upper push rod of the push rod valve and the upper cover.

3. The apparatus according to claim 1, characterized in that: A rubber pad is glued to the lower end face of the lower valve plate of the push rod valve.

4. The apparatus according to claim 1, characterized in that: The air passages within the valve plate include radial through holes and axial through holes; The radial through hole penetrates the valve plate along 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.

5. The apparatus according to claim 4, characterized in that: The minimum cross-sectional area inside the air passage of the push rod valve is smaller than the cross-sectional area of ​​the central through hole of the partition.

6. The apparatus according to claim 5, characterized in that: The minimum cross-sectional area inside the air passage meets the requirements for slow inflation and can fill the headband with gas within the threshold pressure range.

7. The apparatus according to claim 5, characterized in that: The total cross-sectional area of ​​the main air vents meets the needs of rapid wearing, and the headband can be inflated to its maximum size within 2 seconds.

8. The apparatus according to claim 5, characterized in that: The spring preload is used to seal the ball valve, and the spring preload is less than the gas supply pressure during gas supply.

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