Small volume and high flow rate airborne oxygen system pressure reducer

Abstract

The present invention discloses a small-volume and large-flow airborne oxygen system pressure reducer, wherein a lower inner cavity is provided at the lower end of the pressure reducer body, an air inlet inner cavity and an air outlet inner cavity are also provided on the pressure reducer body, a return inner cavity is provided at the upper end of the pressure reducer base, the return inner cavity is located in the lower inner cavity, the air inlet inner cavity is communicated with the lower inner cavity, a control through hole is provided between the lower inner cavity and the air outlet inner cavity, the lower end of the valve is sealed and connected to the upper part of the return inner cavity and can slide vertically, the upper end of the valve passes through the control through hole, a sealing gasket is installed at a position corresponding to the control through hole on the valve, a vent hole communicating with the inside and outside is provided on the cavity wall of the return inner cavity, a vertical return spring is installed in the return inner cavity, and the sealing gasket is an annular plane sealing gasket. The present invention significantly improves the bursting pressure by providing a vent hole communicating with the inside and outside on the cavity wall of the return inner cavity and installing a spring in the return inner cavity, and adopts a plane sealing gasket so that the small-volume pressure reducer has the advantages of high bursting pressure and large gas flow.

Description

Technical Field

[0001] The invention relates to a gas pressure reducer for aviation, in particular to a small-volume and large-flow airborne oxygen system pressure reducer. Background Art

[0002] The pressure reducer is also called a pressure reducing valve. The current development of pressure reducer technology is relatively mature. From the perspective of the pressure reducing medium, it can be divided into two categories: liquid pressure reducers and gas pressure reducers. As for the gas pressure reducer, its main function is to automatically (or manually adjust) reduce the pressure of the input gas and keep it within a certain range to facilitate the normal operation of the back-end equipment. In terms of specific structure, the gas pressure reducer is divided into a forward pressure reducer and a reverse pressure reducer. The effect of the input pressure on the pressure reducing valve is the same as the opening direction of the valve. It is called a forward pressure reducer, and the opposite is called a reverse pressure reducer.

[0003] The main technical principle of the automatic pressure reducing device is as follows: the pressure sensing chamber collects the pressure at the rear end, and the pressure sensing chamber is adjusted and cooperates with the pressure regulating spring to realize the pressure control at the output end of the pressure reducing device. Based on this principle, there are pressure reducing devices for high pressure and low pressure at the input end, namely high pressure reducing device and low pressure reducing device.

[0004] Traditional high-pressure reducers have the following problems: because the high-pressure gas must be sealed and decompressed, the bursting pressure of the reducer must be increased, so the valve often uses a conical seal, which has a very small flow area and results in a very small output flow. In order to solve this problem, the reducer can only be enlarged without changing the structure, resulting in poor adaptability of the reducer as a component of a certain product.

[0005] Traditional low-pressure pressure reducers have the following problems: the seal is sealed with glue, the installation and sealing of the gasket are unstable and not suitable for oxygen products; the output pressure stability is poor; at the same time, there are also problems such as large volume and large flow, and small volume and small flow.

[0006] In summary, traditional automatic pressure regulators have problems such as small gas flow area, small output flow or large product volume, and unstable sealing, and are not suitable for decompressing oxygen in airborne oxygen systems. Summary of the invention

[0007] The purpose of the present invention is to provide an onboard oxygen system pressure reducer with high burst pressure, small volume and large flow rate in order to solve the above problems.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0009] A small-volume, high-flow airborne oxygen system pressure reducer, comprising a pressure reducer body, a pressure reducer base, a valve, a valve control device and a sealing gasket, wherein the lower end of the pressure reducer body is provided with a lower inner cavity with an opening at the lower end, the pressure reducer body is also provided with an air inlet cavity for inputting high-pressure gas and an air outlet cavity for outputting low-pressure gas, the upper end of the pressure reducer base is provided with a return inner cavity with an opening at the upper end, the pressure reducer base is connected to the lower end of the pressure reducer body and seals the lower end of the lower inner cavity, and the return inner cavity is located in the lower inner cavity, the air inlet inner cavity is communicated with the lower inner cavity, a control through hole for controlling the flow area of ​​the gas path is provided between the lower inner cavity and the air outlet inner cavity, the lower end of the valve is sealed and connected to the upper part of the return inner cavity and can slide vertically, the upper end of the valve passes through the control through hole from bottom to top, The sealing gasket is installed at a position on the valve corresponding to the control through hole, and the sealing gasket can be in sealing contact with the lower end hole wall of the control through hole from bottom to top under the drive of the valve. The valve control device is installed at the upper end of the pressure reducer body and generates a downward thrust on the valve. A vertical return spring is installed in the return inner cavity, and the return spring is installed between the lower end of the valve and the lower inner wall of the return inner cavity. The sealing gasket is an annular plane sealing gasket. An annular plane platform for installing the sealing gasket is provided on the valve, and an external thread is provided on the lower end side wall of the valve. A clamping cover is connected to the external thread of the valve through its own internal thread. A vertical through hole is provided at the upper end of the clamping cover to form a clamping ring. The clamping ring presses the sealing gasket onto the annular plane platform of the valve from top to bottom.

[0010] Preferably, in order to guide the air pressure of the air outlet cavity to the return cavity to assist the return spring in closing the valve when the air pressure is relatively high, a through hole connecting the return cavity with the air outlet cavity is provided in the valve.

[0011] Furthermore, in order to prevent the clamping cover from being excessively pressed downward, causing the sealing gasket to deform and bulge upward and affect the sealing effect, a boss is provided on the lower end side wall of the valve below the external thread to limit the thread engagement depth of the clamping cover, thereby controlling the compression amount of the side of the sealing gasket and preventing the sealing gasket from deforming or rolling up.

[0012] Preferably, in order to prevent a high-pressure failure caused by the intake pressure of the pressure reducer being greater than the bursting pressure, an intake safety valve is installed on the outside of the intake inner cavity, which can automatically open and relieve the high pressure when the intake pressure is greater than the bursting pressure.

[0013] Preferably, in order to prevent the gas from directly impacting the valve, the inlet cavity is located above the lower cavity and a vertical gas channel is provided between the two. If the gas directly impacts the valve, it will lead to the following situation: when the pressure reducer is adjusted to a certain value, the change in the pressure of the inlet cavity will directly impact the valve and cause vibration, making the pressure of the outlet cavity extremely unstable. The pressure of the outlet cavity is disturbed by the pressure of the inlet cavity, making it impossible to accurately adjust the pressure of the outlet cavity to a certain value.

[0014] Preferably, in order to sense and detect the outlet pressure in real time and serve as a basis for automatically regulating the outlet pressure, the upper end of the pressure reducer body is provided with an upper inner cavity with an upper end opening and a pressure reducer upper cover is installed on the upper end of the upper inner cavity, the valve control device comprises a pressure sensing nozzle, a spring seat and a pressure regulating spring, the pressure sensing nozzle is installed on the pressure reducer body and connects the outlet inner cavity with the upper inner cavity, the spring seat is installed in the upper inner cavity and is in sealing contact with the cavity wall of the upper inner cavity and can move vertically, and the vertical pressure regulating spring is installed between the upper end of the spring seat and the upper inner wall of the pressure reducer upper cover.

[0015] Preferably, in order to prevent the rear-end equipment from not working properly due to excessive outlet pressure, a vertical pressure relief hole is provided in the middle of the upper end of the spring seat, a horizontal pressure relief sealing sheet is placed between the spring seat and the upper end of the valve and can be sealed with the upper hole wall of the vertical pressure relief hole after the spring seat moves downward, and unsealed with the upper hole wall of the vertical pressure relief hole after the spring seat moves upward, and a horizontal pressure relief hole is provided on the side wall of the upper cover of the pressure reducer. When the rear end of the pressure reducer is in a blocked state and there is no pressure relief device at the rear end, if the rear end pressure is higher than the target value, the rear end pressure needs to be reduced, and the excess gas needs to be unloaded. At this time, after unsealing the vertical pressure relief hole, the high-pressure gas in the outlet cavity flows through the upper cavity and the cavity of the upper cover of the pressure reducer and is immediately unloaded through the horizontal pressure relief hole, thereby realizing the pressure relief function of this state.

[0016] Preferably, in order to facilitate changing the thrust of the pressure regulating spring on the valve to achieve rapid pressure relief when the air pressure in the air outlet cavity is too high, an anti-loosening cover is installed at the upper end of the pressure reducer upper cover, and an adjusting screw is provided in the middle of the anti-loosening cover. The adjusting screw passes through the central through hole of the pressure reducer upper cover and is connected with an adjusting nut. The adjusting nut is placed above the pressure regulating spring and in contact with the upper end of the pressure regulating spring.

[0017] The beneficial effects of the present invention are:

[0018] The present invention installs a spring in the return cavity, arranges an annular plane platform on the valve, places the annular plane sealing gasket on the annular plane platform, and presses the sealing gasket onto the annular plane platform of the valve through a clamping ring of a clamping cover threadedly connected to the valve, thereby significantly improving the installation and sealing stability of the sealing gasket, and can control the compression amount of the side of the sealing gasket to prevent the sealing gasket from deforming or rolling up, ensuring that a stable sealing effect can be achieved when a flat sealing gasket is used and the gas flow area between the control through hole and the sealing gasket is significantly increased, and avoiding the disadvantage of using an adhesive to install the sealing gasket, which is not suitable for reducing the pressure of oxygen inhaled by the human body. The present invention is particularly suitable as an airborne oxygen system pressure reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view and cross-sectional structure diagram of the small-volume and large-flow airborne oxygen system pressure reducer of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] like Figure 1As shown, the airborne oxygen system pressure reducer with small volume and large flow rate described in the present invention includes a pressure reducer body 17, a pressure reducer base 22, a valve 15, a valve control device and a sealing gasket 16. The lower end of the pressure reducer body 17 is provided with a lower inner cavity 19 with a lower end opening. The pressure reducer body 17 is also provided with an air inlet cavity 14 for inputting high-pressure gas and an air outlet cavity 13 for outputting low-pressure gas. The upper end of the pressure reducer base 22 is provided with a return inner cavity 20 with an upper end opening. The pressure reducer base 22 is connected to the lower end of the pressure reducer body 17 and closes the lower end of the lower inner cavity 19. The return inner cavity 20 is located in the lower inner cavity 19. The air inlet inner cavity 14 is communicated with the lower inner cavity 19. A control through hole (not marked in the figure) for controlling the flow area of ​​the gas path is provided between the lower inner cavity 19 and the air outlet inner cavity 13. The lower end of the valve 15 is sealed and connected to the upper part of the return inner cavity 20 and can slide vertically. The upper end of the valve 15 passes through the control through hole from bottom to top. A sealing gasket 16 is installed at a position corresponding to the control through hole, and the sealing gasket 16 can be sealed and contacted with the lower end hole wall of the control through hole from bottom to top under the drive of the valve. The valve control device is installed at the upper end of the pressure reducer body 17 and generates a downward thrust on the valve 15. A vent hole (not shown in the figure) communicating with the inside and outside is provided on the cavity wall of the return cavity 20. A vertical return spring 21 is installed in the return cavity 20. The return spring 21 is installed between the lower end of the valve 15 and the lower inner wall of the return cavity 20. The sealing gasket 16 is an annular plane sealing gasket. An annular plane platform (not marked in the figure) for installing the sealing gasket 16 is provided on the valve 15. An external thread is provided on the side wall of the lower end of the valve 15. The clamping cover 18 is connected to the external thread of the valve 15 through its own internal thread. A vertical through hole is provided at the upper end of the clamping cover 18 to form a clamping ring. The clamping ring presses the sealing gasket 16 on the annular plane platform of the valve 15 from top to bottom.

[0022] Preferably, the valve is provided with a through hole connecting the return cavity with the outlet cavity; a boss (not marked in the figure) for limiting the thread engagement depth of the clamping cover 18 is provided on the lower side wall of the valve 15 at a position below the external thread; an intake safety valve (not shown in the figure) is installed on the outer side of the intake cavity 14, which can automatically open and release the high pressure when the intake pressure is greater than the bursting pressure; the intake cavity 14 is located above the lower cavity 19 and a vertical gas channel (not marked in the figure) is provided between the two; the upper end of the pressure reducer body 17 is provided with an upper cavity 10 with an upper end opening and the upper end of the upper cavity 10 is installed with a pressure reducer upper cover 6, the valve control device includes a pressure sensing nozzle 12, a spring seat 9 and a pressure regulating spring 7, the pressure sensing nozzle 12 is installed on the pressure reducer body 17 through a pressure ring 11 and connects the outlet cavity 13 with the upper cavity 10, the spring seat 9 is installed in the upper cavity 10 and is connected to the upper cavity The cavity wall of the inner cavity 10 is sealed and can move vertically. The vertical pressure-adjusting spring 7 is installed between the upper end of the spring seat 9 and the inner wall of the upper end of the pressure reducer cover 6; a vertical pressure relief through hole (not marked in the figure) is provided in the middle of the upper end of the spring seat 9, and a horizontal pressure relief sealing sheet 8 is placed between the spring seat 9 and the upper end of the valve 15 and can be sealed with the upper hole wall of the vertical pressure relief through hole after the spring seat 9 moves downward, and unsealed from the upper hole wall of the vertical pressure relief through hole after the spring seat 9 moves upward. A horizontal pressure relief through hole 5 is provided on the side wall of the pressure reducer cover 6; an anti-loosening cover 1 is installed on the upper end of the pressure reducer cover 6, and an anti-loosening clamp 2 is provided between the inner wall of the anti-loosening cover 1 and the upper end of the pressure reducer cover 6, and an adjusting screw 4 is provided in the middle of the anti-loosening cover 1. The adjusting screw 4 passes through the central through hole of the pressure reducer cover 6 and is connected with the adjusting nut 3. The adjusting nut 3 is placed above the pressure regulating spring 7 and contacts with the upper end of the pressure regulating spring 7.

[0023] like Figure 1 As shown, when in use, the port of the air inlet cavity 14 is connected to a high-pressure oxygen source (such as an oxygen concentrator), and the high-pressure oxygen first enters the air inlet cavity 14, then enters the lower cavity 19, and enters the air outlet cavity 13 from the control through hole through the gap between the sealing gasket 16 and the control through hole. Then, most of the gas is sent to the low-pressure oxygen tank through the port of the air outlet cavity 13, and a small part of the gas flows into the upper cavity 10 through the pressure sensing nozzle 12. After the upper cavity 10 builds up pressure, the pressure acts on the spring seat 9, and the pressure regulating spring 7 is opposed to each other until a balance is reached; at this time, one of the following three states will exist:

[0024] First, if the input oxygen pressure is less than the set value, that is, the pressure of the upper inner cavity 10 is less than the elastic force of the pressure regulating spring 7, the spring seat 9 does not move, the gap between the control through hole and the sealing gasket 16, that is, the valve gap remains unchanged, and the pressure reducer has no pressure reducing effect;

[0025] Second, if the input oxygen pressure is equal to the set value, that is, the upper inner cavity 10 and the pressure regulating spring 7 are in balance, and the spring seat 9 is in a state of being about to move but not moving (i.e., a critical state), at this time, the pressure reducer has a certain filtering effect on the fluctuation of the front-end pressure;

[0026] Third, if the input oxygen pressure is greater than the set value, that is, the pressure generated by the upper inner cavity 10 is greater than the force of the pressure regulating spring 7, the spring seat 9 will be displaced upward. During the displacement process, if the pressure in a certain period of time is too large, the pressure relief sealing gasket 8 will be separated from the upper end of the valve 15, and a part of the gas in the upper inner cavity 10 will enter the pressure reducer upper cover 6 from the vertical pressure relief through hole, and be discharged through the horizontal pressure relief through hole 5, so as to achieve rapid pressure relief and avoid damage to the equipment caused by high pressure; at the same time, under the dual action of the return spring 21 and the high-pressure oxygen entering the lower inner cavity 20, the valve 15 moves upward, driving the sealing gasket 16 to move upward and squeeze the lower end hole wall of the control through hole to form a seal, that is, the valve is closed, and the oxygen in the lower inner cavity 19 no longer enters the air outlet cavity 13, and the pressure in the air outlet cavity 13 will quickly drop to the set value and gradually reach stability, and the pressure reducer realizes the pressure relief function.

[0027] The above three states appear cyclically to realize automatic adaptive regulation of the high-pressure oxygen decompression process.

[0028] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A small-volume, high-flow airborne oxygen system pressure reducer, comprising a pressure reducer body, a pressure reducer base, a valve, a valve control device and a sealing gasket, wherein the lower end of the pressure reducer body is provided with a lower inner cavity with a lower end opening, the pressure reducer body is also provided with an air inlet inner cavity for inputting high-pressure gas and an air outlet inner cavity for outputting low-pressure gas, the upper end of the pressure reducer base is provided with a return inner cavity with an upper end opening, the pressure reducer base is connected to the lower end of the pressure reducer body and closes the lower end of the lower inner cavity, and the return inner cavity is located in the lower inner cavity, the air inlet inner cavity is connected to the lower inner cavity The inner cavity is connected, a control through hole for controlling the flow area of ​​the gas path is provided between the lower inner cavity and the air outlet inner cavity, the lower end of the valve is sealed and connected to the upper part of the return inner cavity and can slide vertically, the upper end of the valve passes through the control through hole from bottom to top, the sealing gasket is installed at a position corresponding to the control through hole on the valve and the sealing gasket can be driven by the valve to seal and contact with the lower end hole wall of the control through hole from bottom to top, the valve control device is installed at the upper end of the pressure reducer body and generates a downward thrust on the valve, characterized in that: A vertical return spring is installed in the return cavity, and the return spring is installed between the lower end of the valve and the lower inner wall of the return cavity. The sealing gasket is an annular plane sealing gasket, and the valve is provided with an annular plane platform for installing the sealing gasket. The lower end side wall of the valve is provided with an external thread, and the clamping cover is connected with the external thread of the valve through its own internal thread. The upper end of the clamping cover is provided with a vertical through hole and forms a clamping ring, and the clamping ring presses the sealing gasket on the annular plane platform of the valve from top to bottom; a through hole connecting the return cavity with the air outlet cavity is provided in the valve; a boss for limiting the thread engagement depth of the clamping cover is provided on the lower end side wall of the valve below the external thread.

2. The small-volume, high-flow airborne oxygen system pressure reducer according to claim 1, characterized in that: An intake safety valve is installed outside the intake inner cavity, which can automatically open and release the high pressure when the intake pressure is greater than the bursting pressure.

3. The small volume and large flow airborne oxygen system pressure reducer according to claim 1, characterized in that: The air inlet cavity is located above the lower cavity and a vertical air passage is provided between the two.

4. The small volume and large flow airborne oxygen system pressure reducer according to any one of claims 1 to 3, characterized in that: The upper end of the pressure reducer body is provided with an upper inner cavity with an upper end opening, and the upper end of the upper inner cavity is installed with a pressure reducer upper cover, the valve control device includes a pressure sensing nozzle, a spring seat and a pressure regulating spring, the pressure sensing nozzle is installed on the pressure reducer body and connects the air outlet inner cavity with the upper inner cavity, the spring seat is installed in the upper inner cavity and is in sealing contact with the cavity wall of the upper inner cavity and can move vertically, and the vertical pressure regulating spring is installed between the upper end of the spring seat and the upper end inner wall of the pressure reducer upper cover.

5. The small-volume, high-flow airborne oxygen system pressure reducer according to claim 4, characterized in that: A vertical pressure relief hole is provided in the middle of the upper end of the spring seat, a horizontal pressure relief sealing sheet is placed between the spring seat and the upper end of the valve and can be sealed with the upper hole wall of the vertical pressure relief hole after the spring seat moves downward, and unsealed from the upper hole wall of the vertical pressure relief hole after the spring seat moves upward, and a horizontal pressure relief hole is provided on the side wall of the pressure reducer upper cover.

6. The small-volume, high-flow airborne oxygen system pressure reducer according to claim 4, characterized in that: An anti-loosening cover is installed at the upper end of the pressure reducer upper cover, and an adjusting screw is provided in the middle of the anti-loosening cover. The adjusting screw passes through the central through hole of the pressure reducer upper cover and is connected with an adjusting nut. The adjusting nut is placed above the pressure regulating spring and contacts with the upper end of the pressure regulating spring.

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