Integrated inflation and deflation and pressure relief protection valve suitable for air bag

Abstract

The utility model relates to the technical field of aviation emergency safety equipment, in particular to an integrated inflation and deflation and pressure relief protection valve suitable for an air bag, which comprises a valve casing, a valve core ejector rod, a sleeve, a limit block, an air inlet and deflation channel spring, a pressure relief channel spring and a valve core end. The upper end surface of the sleeve is limited and sealed by the step surface of the shell; the limiting block is installed in the shell, one end of the limiting block is clamped in a groove in the shell through a clamping jaw, the other end of the limiting block abuts against the air inlet and outlet channel spring, then the sleeve is ejected upwards, and the sleeve moves downwards to penetrate through a circular ring of the limiting block under the action of external force. The valve core ejector rod is arranged in the shell from the upper part and is sealed with the sleeve; the pressure relief channel spring is arranged in the sleeve from the lower part and is limited through a step surface in the sleeve; the valve element end and the valve element ejector rod are fixedly connected, the pressure relief channel spring abuts against the valve element end downwards, and then the valve element ejector rod is subjected to downward pulling force and keeps being sealed with the sleeve.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of aviation emergency safety equipment, is applied to various aviation emergency air bags, and particularly relates to a novel integrated inflation and deflation and pressure relief protection valve suitable for air bags. BACKGROUND

[0002] Capsule series equipment such as flight personnel floating survival, helicopter emergency floating, special equipment floating and action is in a vacuum folding package state in daily life, and is widely applied in various fields due to the characteristics of small size and light weight.

[0003] At present, various types of aviation emergency floats are respectively provided with inflation and deflation valves and safety valves, wherein the inflation and deflation valves are convenient for pressure test and rapid inflation and deflation of the float during detection; the safety valve is mainly used for overpressure protection of the inflatable float, and when the pressure in the float exceeds the opening threshold set by the safety valve, the safety valve is opened to deflate until the pressure in the float is lower than the closing threshold set by the safety valve, and then the safety valve is automatically closed. However, the current float air bags are each independent piece, and each interface needs to be increased on the air bag, so that the procurement cost and manufacturing cost are high, and the stress concentration area of the air bag is increased. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a novel integrated inflation and deflation and pressure relief protection valve suitable for air bags, which realizes the inflation and deflation function from outside to inside and the overpressure protection function from inside to outside through integrated design, and reduces the number of air bag interfaces and stress concentration areas.

[0005] The utility model adopts the technical scheme as follows: the integrated inflation and deflation and pressure relief protection valve suitable for air bags comprises a valve shell, a valve core top rod, a sleeve, a limiting block, an inflation and deflation passage spring, a pressure relief passage spring and a valve core end, and is characterized in that: the inflation and deflation passage spring is sleeved on the sleeve and is installed in the shell, the upper end face of the sleeve is limited and sealed by the step face of the shell; the limiting block is installed in the shell, one end is clamped in the recess in the shell through a clamping jaw, and the other end presses against the inflation and deflation passage spring, so that the sleeve is pressed upward under the action of external force and moves downward to pass through the ring of the limiting block; the valve core top rod is installed in the shell and is sealed with the sleeve from above; the pressure relief passage spring is installed in the inside of the sleeve from below and is limited by the step face in the inside of the sleeve; the valve core end is fixedly connected with the valve core top rod, the pressure relief passage spring presses against the valve core end downward, and then the valve core top rod is subjected to downward pulling force and is kept sealed with the sleeve.

[0006] In the above scheme, two step faces are arranged on the inside and outside of the sleeve, so that the inflation and deflation passage spring and the pressure relief passage spring are respectively controlled and limited.

[0007] The gap between the limiting block and the valve core end head leaves a gap, so that the sleeve and the valve core top rod are displaced downward, the sealing surface is separated from the valve body to realize inflation or deflation.

[0008] In the scheme, the valve core top rod and the sleeve are in contact sealing, the valve core end head and the sleeve are in contact sealing, and the valve core end head and the valve core top rod are connected through threads.

[0009] In the scheme, the upper end surface of the valve core top rod is compressed by the gas pressure and the external pressing force, so that the inflation / deflation passage spring is compressed between the sleeve end surface and the limiting block, the sleeve and the valve core top rod are displaced downward by a certain displacement, the sealing surface is separated from the valve body to start inflation or deflation.

[0010] In conclusion, due to the adoption of the technical scheme, the beneficial effects of the utility model are that: through integrated design, inflation / deflation from outside to inside and overpressure protection from inside to outside can be realized, the structure has the characteristics of high integration, small size, small space, light weight and the like, the number of valve body interfaces on the buoy and the stress concentration area on the buoy are reduced, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the explosion schematic diagram of the utility model;

[0012] Figure 2 is the assembly schematic diagram of the utility model;

[0013] Figure 3 is the outward pressure relief process schematic diagram of the integrated valve of the utility model;

[0014] Figure 4 is the manual inflation / deflation process schematic diagram of the integrated valve of the utility model.

[0015] Marked in the figure: 1 - valve housing, 2 - valve core top rod, 3 - sleeve, 4 - inflation / deflation passage spring, 5 - limiting block, 6 - pressure relief passage spring, 7 - valve core end head. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below by combining with the drawings and examples.

[0017] Referring to Figure 1-4. An integrated inflation / deflation and pressure relief protection valve for airbags, integrating a valve body 1, a valve core push rod 2, a valve core end 7, a sleeve 3, a limiting block 5, an inlet / deflation channel spring 4, and a pressure relief channel spring 6. The valve body 1, valve core push rod 2, sleeve 3, inlet / deflation channel spring 4, and limiting block 5 are interconnected to achieve inlet and deflation functions. Under the action of gas pressure and external pressure, the upper end face of the valve core push rod 2 compresses the spring, causing the inlet / deflation channel spring 4 to be compressed between the end face of the sleeve 3 and the limiting block 5. The sleeve 3 and valve core push rod 2 move downwards by a certain displacement, separating the sealing surface from the valve body, initiating inflation or deflation. When the external force decreases or is eliminated, the valve core, under the action of spring force and internal gas pressure, restores the seal between itself and the valve body. Under the action of internal pressure, the valve core seals the air inlet, acting as a check valve.

[0018] When using this valve as a venting valve, press the valve core push rod manually or with a cylindrical tool to move the valve core inward toward the float and open the valve. The internal gas is then released to the outside through the valve port, achieving the purpose of venting. When the pressing stops, the valve core restores its seal with the valve body under the action of the spring and the internal gas pressure.

[0019] When the pressure inside the container is greater than the spring preload, the valve core, under the action of air pressure, separates its valve core rod sealing surface from the valve body. The valve core rod drives the pressure relief channel spring and the valve core end to move upward, thereby opening the safety valve and starting to release air. When the pressure inside the container is less than or equal to the spring preload, the valve core closes under the action of spring force.

[0020] The assembly process of the integrated inflation / deflation and pressure relief protection valve involved in this utility model is as follows:

[0021] The inlet / outlet channel spring 4 is fitted over the sleeve 3 and installed inside the housing 1. The upper end face of the sleeve 3 is limited and sealed by the stepped surface of the housing 1. The limiting block 5 is installed into the housing and is secured in the groove inside the housing 1 by the claws. The limiting block 5 presses against the inlet / outlet channel spring 4, thereby pressing the sleeve 3 upward. At the same time, the sleeve 3 can move downward under the action of external force and pass through the ring of the limiting block 5. The valve core push rod 2 is installed into the housing from above, and the valve core push rod 2 contacts and seals with the sleeve 3. The pressure relief channel spring 6 is installed into the inside of the sleeve 3 from below and is limited by the stepped surface inside the sleeve 3. The valve core end 7 is connected to the valve core push rod 2 by threads. The pressure relief channel spring 6 presses against the valve core end 7 downward, thereby causing the valve core push rod 2 to be subjected to downward pulling force, maintaining contact and sealing with the sleeve 3.

[0022] The working principle of the integrated inflation / deflation and pressure relief protection valve involved in this utility model is as follows:

[0023] like Figure 3As shown, when the pressure inside the float is too high and excess gas needs to be released to the outside, this integrated valve can be used as a safety valve. The specific working process is as follows: Under the action of internal pressure, the valve core rod 2 drives the valve core end 7 to move upwards. The upper side of the pressure relief channel spring 6 is limited by the stepped surface of the sleeve 3, and the lower side is further compressed by the valve core end 7. The spring compression force gradually increases. After the valve core rod 2 moves upwards, its sealing surface separates from the sleeve 3, thereby opening the safety valve and starting to release pressure. As the pressure inside the float gradually decreases, when the force acting on the valve core rod 2 is less than the spring compression force, the pressure relief channel spring 6 gradually rebounds. Under its elastic force, the valve core rod 2 automatically closes, re-contacting and sealing with the sleeve 3, ensuring that the pressure inside the float automatically stabilizes at the required working pressure.

[0024] like Figure 4 As shown, when manual inflation or deflation is required, this integrated valve can be used as an inflation / deflation valve. The specific working process is as follows: Using a cylindrical tool or fixture, press the valve core push rod 2 downwards, causing it to move the sleeve 3 towards the inside of the float. The outer stepped surface of the sleeve 3 further compresses the inlet / deflation channel spring 4 downwards. The inlet / deflation channel spring 4 is still limited by the limiting block 5. After the sleeve 3 moves downwards, the internal gas is discharged to the outside through the valve port, achieving the purpose of inflation / deflation. When the valve core push rod 2 is released, under the action of the inlet / deflation channel spring 4 and the internal gas pressure, the sleeve 3 drives the valve core push rod 2 upwards, thereby restoring the seal with the valve body.

[0025] During the external pressure relief and manual inflation / deflation processes, the inner and outer stepped surfaces of the sleeve 3 can respectively constrain and control the inlet / deflation channel spring 4 and the pressure relief channel spring 6. When external pressure is relieved, only the pressure relief channel spring 6 operates, while the inlet / deflation channel spring 4 remains in its original position. When manual inflation / deflation occurs, only the inlet / deflation channel spring 4 compresses downwards. Since the relative positions of the sleeve 3, valve core push rod 2, and valve core end 7 remain unchanged, the pressure relief channel spring 6 can still maintain its original position. This ensures that the two springs can operate independently in both processes without affecting each other.

[0026] The above technical solutions are merely preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any equivalent changes made in accordance with the scope of this utility model patent shall still fall within the protection scope of this utility model.

Claims

1. An integrated inflation and deflation valve and pressure relief valve for air bags, comprising a valve housing (1), a valve core top rod (2), a sleeve (3), a limiting block (5), an inflation and deflation passage spring (4), a pressure relief passage spring (6) and a valve core end head (7), characterized in that: The inlet and outlet gas passage spring (4) is sleeved outside the sleeve (3) and installed in the shell (1), and the upper end surface of the sleeve (3) is limited and sealed by the stepped surface of the shell (1); the limiting block (5) is installed in the shell (1), one end is clamped in the recess in the shell (1) through the clamping jaw, and the other end abuts against the inlet and outlet gas passage spring (4), and then the sleeve (3) is abutted upward, so that the sleeve (3) moves downward and passes through the ring of the limiting block (5) under the action of external force; The valve core top rod (2) is installed in the shell (1) from the upper side and is sealed with the sleeve (3); the pressure relief passage spring (6) is installed in the inside of the sleeve (3) from the lower side and is limited by the stepped surface in the inside of the sleeve (3); the valve core end head (7) is fixedly connected with the valve core top rod (2), the pressure relief passage spring (6) abuts against the valve core end head (7) downward, and then the valve core top rod (2) is subjected to downward pulling force, and the sealing with the sleeve (3) is maintained.

2. The integrated inflation and deflation and pressure relief protection valve for an air bag of claim 1, wherein: The inside and outside of the sleeve (3) are provided with two stepped surfaces, so that the inlet and outlet gas passage spring (4) and the pressure relief passage spring (6) are respectively controlled.

3. The integrated inflation and deflation and pressure relief protection valve for an air bag of claim 1, wherein: The gap is left between the limiting block (5) and the valve core end head (7), so that the sleeve (3) and the valve core top rod (2) are displaced downward, the sealing surface is separated from the valve body, and inflation or deflation is realized.

4. The integrated inflation and deflation and pressure relief protection valve for an air bag of claim 1, wherein: The valve core top rod (2) is in contact with the sleeve (3).

5. The integrated inflation and deflation and pressure relief protection valve for an air bag of claim 1, wherein: The valve core end head (7) is in contact with the sleeve (3).

6. The integrated inflation and deflation and pressure relief protection valve for an air bag of claim 1, wherein: The valve core end head (7) is threadedly connected with the valve core top rod (2).

7. The integrated inflation and deflation and pressure relief valve for an air bag of claim 1, wherein: The upper end surface of the valve core top rod (2) is compressed by the gas pressure and the external pressing force, so that the inlet and outlet gas passage spring (4) is compressed between the end surface of the sleeve (3) and the limiting block (5), the sleeve (3) and the valve core top rod (2) move downward by a certain displacement, the sealing surface is separated from the valve body, inflation or deflation is started, when the external force is reduced or eliminated, the valve core is restored to be sealed with the valve body under the action of the spring force and the internal gas pressure, the valve core seals the inlet under the action of the internal pressure, and the check action is realized.

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