Reference pressure double control type pressure building mechanism for high altitude oxygen inhalation system

Abstract

The application discloses a reference air pressure double-control type pressure building mechanism for a high-altitude oxygen inhalation system, which comprises a pressure building base, a bellows, a bellows valve plug, a bellows valve seat, an adjusting seat, a first compression spring, a motor pressure building valve seat, a motor pressure building valve cover plate, a second compression spring, a motor support, a motor pressure building transmission rod and a motor. The bellows, the bellows valve plug, the bellows valve seat, the adjusting seat and the first compression spring form a bellows valve mechanism, and the motor, the motor pressure building valve seat, the motor pressure building valve cover plate, the second compression spring and the motor pressure building transmission rod form a motor pressure building valve mechanism. According to the actual pressure building condition and the required air pressure condition, the motor pressure building valve mechanism can actively adjust the air pressure in the pressure building inner cavity to increase or decrease, and finally realizes the double-control function of automatically controlling and actively controlling the reference air pressure in the pressure building inner cavity, thereby improving the oxygen inhalation safety and comfort.

Description

Technical Field

[0001] This invention relates to a pressure-building mechanism for an oxygen inhalation system, and more particularly to a dual-control pressure-building mechanism for a reference air pressure in a high-altitude oxygen inhalation system, belonging to the field of high-altitude oxygen inhalation equipment manufacturing technology. Background Technology

[0002] High-altitude oxygen supply systems are used to provide oxygen to aerospace pilots and other personnel. Because atmospheric pressure is lower at high altitudes, if the oxygen pressure is the same as the ambient pressure, it will lead to insufficient oxygen and breathing difficulties. Therefore, in high-altitude environments, it is necessary to build up the pressure of the inhaled oxygen. This is achieved by setting up a pressure-building chamber to establish a reference pressure. While ensuring the intake pressure of the pressure-building chamber, the opening of the pressure regulating valve is reduced or closed, so that the reference oxygen pressure in the pressure-building chamber is higher than the ambient pressure. This pressure acts on the oxygen intake space of the oxygen mask, achieving the purpose of pressure building. Simultaneously, considering the exhalation process, the exhaled gas is discharged through the exhaust valve. Therefore, the reference pressure in the pressure-building chamber also needs to act on the exhaust valve to control the discharged gas, thereby establishing a breathing pressure based on the reference pressure within the oxygen mask to meet the breathing needs during high-altitude flight.

[0003] Traditional reference pressure building mechanisms used in high-altitude oxygen supply systems employ a separate bellows-based mechanism. Its basic structure includes a pressure-building base, a bellows, a bellows valve plug, and a bellows valve seat. The pressure-building base contains a pressure-building inner cavity and has an inlet and outlet port that communicate with each other. The bellows valve seat is mounted on the pressure-building base, with its inner cavity (or through-hole) communicating with the pressure-building inner cavity. The bellows connects to the bellows valve plug, which corresponds to and seals the valve end of the bellows valve seat. Its working principle is as follows: As the aircraft (such as an airplane or spacecraft) ascends, the ambient air pressure decreases. The bellows automatically extends, causing the bellows valve plug to move closer to the valve end of the bellows valve seat, reducing the airflow at the valve end. This gradually increases the pressure within the pressure-building inner cavity, achieving automatic pressure building.

[0004] Note: The valve end of the bellows valve seat mentioned above refers to the convex ring provided on the bellows valve seat. The end of the convex ring is neat and smooth, and can achieve sealing contact with the corresponding valve plug or valve cover. The central through hole of the convex ring communicates with the inner cavity or through hole of the bellows valve seat. The valve ends of other valve seats described below are the same.

[0005] The aforementioned traditional reference pressure build-up mechanism for high-altitude oxygen supply systems has the following drawbacks:

[0006] Relying solely on the automatic expansion and contraction of the bellows to achieve automatic pressure build-up can lead to insufficient or excessive pressure build-up due to variations in the bellows' performance. Furthermore, there's no way to intervene in this process, ultimately resulting in oxygen users experiencing excessively low or high oxygen pressure, reducing comfort and potentially posing safety hazards. Additionally, oxygen users exhibit individual differences in oxygen pressure, with different people experiencing the highest comfort levels at different pressures. The aforementioned traditional reference pressure build-up mechanism cannot meet this individualized pressure adjustment requirement, thus reducing its practicality. Summary of the Invention

[0007] The purpose of this invention is to provide a dual-control pressure building mechanism for reference air pressure in high-altitude oxygen supply systems that can compensate for the defects of automatic pressure building in bellows and solve the above-mentioned problems.

[0008] The present invention achieves the above objectives through the following technical solutions:

[0009] A dual-control pressure-building mechanism for a high-altitude oxygen inhalation system includes a pressure-building base, a bellows, a bellows valve plug, and a bellows valve seat. The pressure-building base has a pressure-building inner cavity. The bellows valve seat is mounted on top of the pressure-building base, and a vertical through-hole of the bellows valve seat communicates with the pressure-building inner cavity. The vertical bellows is mounted on the pressure-building base via a bellows bracket. The upper end of the bellows is connected to the bellows valve plug, and the lower end of the bellows valve plug corresponds to the valve end of the upper end of the bellows valve seat, enabling [the valve to open / close]. The valve end is sealed. The dual-control pressure-building mechanism for the high-altitude oxygen inhalation system further includes an adjusting seat, a first compression spring, a motor-driven pressure-building valve seat, a motor-driven pressure-building valve cover, a second compression spring, a motor bracket, a motor-driven pressure-building transmission rod, and a motor. The adjusting seat is installed on top of the pressure-building base. The adjusting seat has a vertical adjusting seat through hole that communicates with the pressure-building inner cavity. The bellows valve seat is placed inside the adjusting seat through hole. The vertical first compression spring is placed inside the adjusting seat through hole and located below the bellows valve seat. The motor-driven pressure-building... The valve seat is installed on top of the adjusting seat. The vertical through hole of the motor-driven pressure valve seat communicates with the through hole of the adjusting seat. The motor-driven pressure valve cover plate is located above the motor-driven pressure valve seat and can seal the valve end at the upper end of the motor-driven pressure valve seat. The vertical second compression spring is placed in the vertical through hole of the motor-driven pressure valve seat and is located below the motor-driven pressure valve cover plate. The motor-driven pressure valve cover plate has a vertical central through hole. The bellows valve plug passes through the central through hole of the cover plate and is in contact with the hole wall surface of the central through hole of the cover plate. The motor-driven pressure valve cover plate is equipped with multiple vertical cover plate transmission rods located at the outer periphery of the central through hole of the cover plate. These multiple cover plate transmission rods are located within the vertical through holes of the motor-driven pressure valve seat and can contact the upper surface of the bellows valve seat. The motor is mounted on the pressure-building base via the motor bracket. The motor is connected to the upper end of the motor-driven pressure transmission rod and can drive the motor-driven pressure transmission rod to move vertically. The lower end of the motor-driven pressure transmission rod can contact the upper surface of the motor-driven pressure valve cover plate.

[0010] Preferably, in order to achieve precise driving of the motor pressure-building transmission rod, the motor is a linear stepper motor, and the lower end of the vertical output shaft of the motor is connected to the upper end of the motor pressure-building transmission rod through a nut.

[0011] Preferably, in order to improve the smoothness of the motor pressure-building transmission rod driving the motor pressure-building valve cover plate, the motor pressure-building transmission rod is a "U" shaped rod with both ends at the bottom, and the middle of the upper end of the motor pressure-building transmission rod is connected to the lower end of the vertical output shaft of the motor.

[0012] Preferably, in order to facilitate the installation of the corrugated pipe bracket and limit the movement of the motor pressure building valve cover, the lower end of the corrugated pipe bracket is installed on the upper part of the motor pressure building valve seat, and the lower part of the corrugated pipe bracket is provided with a transverse limiting protrusion. The limiting protrusion is located above the motor pressure building valve cover and is used to limit the upward movement distance of the motor pressure building valve cover.

[0013] Preferably, to further ensure the safety of the pressure-building cavity, a safety valve communicating with the pressure-building cavity is also installed at the bottom of the pressure-building base.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention integrates a bellows valve mechanism (including a bellows, a bellows valve plug, a bellows valve seat, an adjusting seat, and a first compression spring) and a motor-driven pressure-building valve mechanism (including a motor, a motor-driven pressure-building valve seat, a motor-driven pressure-building valve cover, a second compression spring, and a motor-driven pressure-building transmission rod) onto a pressure-building base. On one hand, the bellows valve mechanism enables automatic pressure increase within the pressure-building cavity as altitude increases. On the other hand, the motor-driven pressure-building valve mechanism actively adjusts the pressure within the pressure-building cavity according to actual pressure-building conditions and required pressure. Ultimately, this achieves dual control functions—automatic and active control of the reference pressure within the pressure-building cavity—ensuring users receive the required oxygen (or mixed gas) pressure to the greatest extent possible, improving oxygen safety and comfort, and enhancing the practicality of the reference pressure-building mechanism. Attached Figure Description

[0016] Figure 1 This is a three-dimensional exploded view of the dual-control pressure building mechanism for the high-altitude oxygen supply system described in this invention before assembly;

[0017] Figure 2 This is a three-dimensional view of the assembled reference pressure dual-control pressure building mechanism for the high-altitude oxygen inhalation system described in this invention;

[0018] Figure 3 This is a partial sectional perspective view of the assembled reference pressure dual-control pressure building mechanism for the high-altitude oxygen supply system described in this invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the dual-control pressure-building mechanism for a high-altitude oxygen inhalation system of the present invention includes a pressure-building base 19, a bellows 5, a bellows valve plug 6, a bellows valve seat 12, an adjusting seat 15, a first compression spring 13, a motor pressure-building valve seat 11, a motor pressure-building valve cover plate 8, a second compression spring 10, a motor bracket 2, a motor pressure-building transmission rod 3, and a motor 1. The pressure-building base 19 has a pressure-building inner cavity 22. The pressure-building base 19 has an inlet 20 that communicates with the inside and outside, a first connecting air port 18 for connecting with an oxygen regulator to achieve oxygen supply, and a second connecting air port 16 for connecting with an exhaust valve to provide a reference pressure for exhaled gas. The bellows valve seat 12 is installed on the top of the pressure-building base 19. The vertical through hole of the bellows valve seat 12 communicates with the pressure-building cavity 22. The vertical bellows 5 is installed on the pressure-building base 19 through the bellows bracket 4. The bellows 5 is connected to the upper end of the bellows valve plug 6. The lower end of the bellows valve plug 6 corresponds to the valve end at the upper end of the bellows valve seat 12 and can seal the valve end. The adjusting seat 15 is installed on the pressure-building base 19. The adjusting seat 15 has a vertical adjusting seat through hole 14, which communicates with the pressure-building cavity 22. Specifically, the upper part of the pressure-building cavity 22 has a pressure-building port 17, which communicates with the adjusting seat through hole 14. The pressure-building port 17 and the lower end of the adjusting seat 15 are sealed by a sealing ring. The seat 12 is placed inside the through hole 14 of the adjusting seat. The vertical first compression spring 13 is placed inside the through hole 14 of the adjusting seat and is located below the bellows valve seat 12. The motor pressure building valve seat 11 is installed on top of the adjusting seat 15. The vertical through hole of the motor pressure building valve seat 11 communicates with the through hole 14 of the adjusting seat. The motor pressure building valve cover plate 8 is located above the motor pressure building valve seat 11 and can seal the valve end at the upper end of the motor pressure building valve seat 11. The vertical second compression spring 10 is placed inside the vertical through hole of the motor pressure building valve seat 11 and is located below the motor pressure building valve cover plate 8. The motor pressure building valve cover plate 8 is provided with a vertical cover plate center through hole 7. The bellows valve plug 6 passes through the cover plate center through hole 7 and is aligned with the hole of the cover plate center through hole 7. The wall surfaces are in contact and can move vertically, achieving a good sealing structure. Applying lubricating oil to the outer wall of the bellows valve plug 6 does not affect the relative sliding between them. The lower part of the motor pressure building valve cover plate 8 is provided with multiple vertical cover plate transmission rods 9 located around the central through hole 7 of the cover plate. The multiple cover plate transmission rods 9 are located in the vertical through hole of the motor pressure building valve seat 11 and can contact the upper surface of the bellows valve seat 12. The motor 1 is mounted on the pressure building base 19 through the motor bracket 2. The motor 1 is connected to the upper end of the motor pressure building transmission rod 3 and can drive the motor pressure building transmission rod 3 to move vertically. The lower end of the motor pressure building transmission rod 3 can contact the upper surface of the motor pressure building valve cover plate 8.

[0021] like Figure 1 , Figure 2 and Figure 3As shown, the present invention also discloses the following more optimized specific structures:

[0022] In order to achieve precise driving of the motor pressure building transmission rod 3, the motor 1 is a linear stepper motor, and the lower end of the vertical output shaft of the motor 1 is connected to the upper end of the motor pressure building transmission rod 3 through a nut.

[0023] To improve the smoothness of the motor pressure building transmission rod 3 in moving the motor pressure building valve cover 8, the motor pressure building transmission rod 3 is a "U" shaped rod with both ends at the bottom. The middle of the upper end of the motor pressure building transmission rod 3 is connected to the lower end of the vertical output shaft of the motor 1.

[0024] To facilitate the installation of the corrugated pipe bracket 4 and limit the movement of the motor pressure building valve cover 8, the lower end of the corrugated pipe bracket 4 is installed on the upper part of the motor pressure building valve seat 11. The lower part of the corrugated pipe bracket 4 is provided with a transverse limiting protrusion (not marked in the figure). The limiting protrusion is located above the motor pressure building valve cover 8 and is used to limit the upward movement distance of the motor pressure building valve cover 8.

[0025] To further ensure the safety of the pressure-building cavity 22, a safety valve 21 communicating with the pressure-building cavity 22 is also installed at the bottom of the pressure-building base 19.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, in application, if the bellows valve mechanism can meet the user's needs, it is not necessary to start the motor-driven pressure-building valve mechanism. The pressure-building principle is as follows: as the altitude of the aircraft increases, the air pressure gradually decreases, the bellows 5 will automatically extend, driving the bellows valve plug 6 to move downwards. The distance between the lower end of the bellows valve plug 6 and the valve end of the upper end of the bellows valve seat 12 decreases, the flow rate of oxygen (or mixed gas) in the pressure-building cavity 22 through the valve end of the upper end of the bellows valve seat 12 decreases, and the air pressure in the pressure-building cavity 22 gradually increases, achieving the purpose of pressure building. When the lower end of the bellows valve plug 6 is sealed with the valve end of the upper end of the bellows valve seat 12, the air pressure in the pressure-building cavity 22 further increases to the maximum to meet application requirements under special circumstances.

[0027] If the bellows valve mechanism cannot meet the user's needs, the motor-driven pressure-building valve mechanism needs to be activated. In this case, the pressure building is a dual-control pressure building, which is specifically divided into the following two situations:

[0028] In the first scenario, the pressure automatically built up by the bellows valve mechanism exceeds the actual required pressure. In this case, the control motor 1 drives the motor pressure-building transmission rod 3 downwards. The motor pressure-building transmission rod 3 pushes the motor pressure-building valve cover plate 8 downwards against the force of the second pressure spring 10. The cover plate transmission rod 9 on the motor pressure-building valve cover plate 8 pushes the bellows valve seat 12 downwards against the force of the first pressure spring 13, increasing the distance between the lower end of the bellows valve plug 6 and the upper valve end of the bellows valve seat 12. This increases the pressure of the oxygen (or gas mixture) in the pressure-building inner cavity 22. As the flow rate through the valve end at the upper end of the bellows valve seat 12 increases, the air pressure in the pressure-building cavity 22 gradually decreases, thereby achieving the purpose of reducing the reference air pressure in the pressure-building cavity 22 through the motor-driven pressure-building valve mechanism. During this process, the downward movement distance of the motor-driven pressure-building valve cover plate 8 should not be too large. It is necessary to ensure that there is a sufficient gap between the motor-driven pressure-building valve cover plate 8 and the valve end at the upper end of the motor-driven pressure-building valve seat 11 to ensure that the gas flowing out from the valve end at the upper end of the bellows valve seat 12 can continue to flow out from the valve end at the upper end of the motor-driven pressure-building valve seat 11.

[0029] In the second scenario, the pressure automatically built up by the bellows valve mechanism is lower than the actual required pressure. In this case, the control motor 1 drives the motor pressure-building transmission rod 3 downwards a sufficient distance, ultimately maximizing the distance between the lower end of the bellows valve plug 6 and the upper valve end of the bellows valve seat 12. The amount of gas flowing out of the pressure-building cavity 22 is controlled solely by the distance between the motor pressure-building valve cover plate 8 and the upper valve end of the motor pressure-building valve seat 11. The control motor 1 drives the motor pressure-building transmission rod 3 to continuously move downwards, gradually reducing the motor pressure. The distance between the pressure-building valve cover plate 8 and the valve end at the upper end of the motor pressure-building valve seat 11 gradually reduces the flow rate of gas flowing out of the pressure-building inner cavity 22 through the valve end at the upper end of the bellows valve seat 12, and gradually increases the air pressure in the pressure-building inner cavity 22. This achieves the purpose of increasing the reference air pressure in the pressure-building inner cavity 22 through the motor pressure-building valve mechanism until the motor pressure-building valve cover plate 8 and the valve end at the upper end of the motor pressure-building valve seat 11 are sealed, and the reference air pressure in the pressure-building inner cavity 22 reaches its maximum value, which is sufficient to meet the high pressure requirements of users in special circumstances.

[0030] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A dual-control pressure-building mechanism for a high-altitude oxygen inhalation system, comprising a pressure-building base, a bellows, a bellows valve plug, and a bellows valve seat, wherein the pressure-building base has a pressure-building inner cavity, the bellows valve seat is mounted on the top of the pressure-building base, a vertical through hole of the bellows valve seat communicates with the pressure-building inner cavity, the vertical bellows is mounted on the pressure-building base via a bellows bracket, the bellows is connected to the upper end of the bellows valve plug, the lower end of the bellows valve plug corresponds to the valve end of the upper end of the bellows valve seat and is capable of sealing the valve end, characterized in that: The dual-control pressure-building mechanism for the high-altitude oxygen inhalation system further includes an adjusting seat, a first compression spring, a motor-driven pressure-building valve seat, a motor-driven pressure-building valve cover plate, a second compression spring, a motor bracket, a motor-driven pressure-building transmission rod, and a motor. The adjusting seat is mounted on top of the pressure-building base. The adjusting seat has a vertical through hole that communicates with the pressure-building cavity. The bellows valve seat is placed inside the through hole. The first vertical compression spring is placed inside the through hole and below the bellows valve seat. The motor-driven pressure-building valve seat is mounted on top of the adjusting seat. The vertical through hole of the motor-driven pressure-building valve seat communicates with the through hole of the adjusting seat. The motor-driven pressure-building valve cover plate is located above the motor-driven pressure-building valve seat and can seal the valve end at the upper end of the motor-driven pressure-building valve seat. The second vertical compression spring is placed on top of the motor-driven pressure-building valve seat. The motor pressure-building valve seat is located in the vertical through hole and below the motor pressure-building valve cover plate. The motor pressure-building valve cover plate has a vertical central through hole. The corrugated valve plug passes through the central through hole and contacts the hole wall surface of the central through hole, and can move vertically. The lower part of the motor pressure-building valve cover plate is provided with multiple vertical cover plate transmission rods located on the outer periphery of the central through hole. The multiple cover plate transmission rods are located in the vertical through hole of the motor pressure-building valve seat and can contact the upper surface of the corrugated valve seat. The motor is mounted on the pressure-building base through the motor bracket. The motor is connected to the upper end of the motor pressure-building transmission rod and can drive the motor pressure-building transmission rod to move vertically. The lower end of the motor pressure-building transmission rod can contact the upper surface of the motor pressure-building valve cover plate.

2. The dual-control pressure build-up mechanism for reference air pressure in a high-altitude oxygen supply system according to claim 1, characterized in that: The motor is a linear stepper motor, and the lower end of the vertical output shaft of the motor is connected to the upper end of the motor pressure transmission rod through a nut.

3. The dual-control pressure build-up mechanism for reference air pressure in a high-altitude oxygen supply system according to claim 2, characterized in that: The motor pressure-building transmission rod is a "U"-shaped rod with both ends at the bottom. The upper middle part of the motor pressure-building transmission rod is connected to the lower end of the vertical output shaft of the motor.

4. The dual-control pressure build-up mechanism for reference air pressure in a high-altitude oxygen supply system according to claim 1 or 2, characterized in that: The lower end of the corrugated pipe bracket is installed on the upper part of the motor pressure building valve seat. The lower part of the corrugated pipe bracket is provided with a horizontal limiting protrusion. The limiting protrusion is located above the motor pressure building valve cover plate and is used to limit the upward movement distance of the motor pressure building valve cover plate.

5. The dual-control pressure build-up mechanism for reference air pressure in a high-altitude oxygen supply system according to claim 1 or 2, characterized in that: The bottom of the pressure-building base is also equipped with a safety valve that communicates with the pressure-building cavity.

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