Emergency deflation valve

Abstract

The utility model discloses an emergency deflation valve which comprises an outer cover, the inner portion of the outer cover is hollow, the side wall of the outer cover is sequentially provided with an exhaust hole and a plurality of air inlet holes from top to bottom, the exhaust hole and the air inlet holes are communicated with the inner portion of the outer cover, a movable sealing rod is arranged in the outer cover, and a plurality of sealing rings are sequentially arranged on the side wall of the sealing rod from top to bottom. When the sealing rod moves till the multiple sealing rings are staggered with the exhaust hole and the multiple air inlet holes, the exhaust hole and the multiple exhaust holes are sealed and isolated through the sealing rings, and when the sealing rod moves till the multiple sealing rings are opposite to the exhaust hole and the multiple air inlet holes, the multiple sealing rings are sealed and isolated through the sealing rings. Gaps are formed between the outer walls of the sealing rings and the inner walls of the exhaust holes and the inner walls of the air inlet holes. The emergency deflation valve has the advantages that uniform deflation of all pressure channels is achieved, the operation difficulty is extremely low, and related expensive airborne equipment sensitive components are prevented from being damaged to a certain degree.

Description

Technical Field

[0001] The utility model relates to the technical field of air data measuring and controlling instruments, and particularly relates to an emergency air release valve. Background Technique

[0002] The equipment used for detecting the aircraft air data system is an air data measuring and controlling instrument. The air data measuring and controlling instrument can detect the air data computer, airspeed indicator, barometric altimeter, etc. by controlling pressure to simulate the total pressure, static pressure and other pressure excitations during the flight process. Under normal circumstances, after the detection is completed, the "return to ground" function of the air data measuring and controlling instrument should be started to gradually control the pressure excitation back to the ground open state. During the pressure relief process of returning to the ground, the pressure change rate cannot be too large, and the total pressure cannot be much greater than the static pressure, resulting in a large amount of negative dynamic pressure, otherwise it may damage the on-board avionics equipment.

[0003] However, when the air data measuring and controlling instrument is abnormally powered off or fails during the test and cannot be normally pressure-relieved through the "return to ground" function, it is necessary to use the emergency air release valve of the air data measuring and controlling instrument to release air.

[0004] The existing emergency air release valve of the air data measuring and controlling instrument is in a single-channel form, with one pressure control channel corresponding to one. In the event of a fault, there is no actual pressure feedback display. When multiple channels release air simultaneously, it is necessary to operate evenly and alternately based on experience to avoid excessive pressure differences.

[0005] Although the pressure relief and air release can be finally completed, it is extremely difficult to actually achieve relatively uniform air release operation for each pressure channel, and there is a high probability that sensitive components of related expensive on-board equipment will be damaged to a certain extent. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the above technical deficiencies, and propose an emergency air release valve to solve the technical problems in the background technique.

[0007] To achieve the above technical purpose, the technical solution of the utility model provides an emergency air release valve, including an outer cover. The inside of the outer cover is hollow. The side wall of the outer cover is sequentially provided with an exhaust hole and a plurality of air inlet holes communicating with the inside of the outer cover from top to bottom. An active sealing rod is arranged inside the outer cover, and a plurality of sealing rings are sequentially arranged on the side wall of the sealing rod from top to bottom; when the sealing rod moves to a position where the plurality of sealing rings are respectively staggered with the exhaust hole and the plurality of air inlet holes, the sealing rings seal and isolate between the exhaust hole and the plurality of exhaust holes. When the sealing rod moves to a position where the plurality of sealing rings are respectively opposite to the exhaust hole and the plurality of air inlet holes, gaps are formed between the outer walls of the plurality of sealing rings and the inner walls of the exhaust hole and the plurality of air inlet holes respectively.

[0008] Further, the bottom of the outer cover is closed and the top is open.

[0009] Further, a sealing plate is installed at the opening of the top of the outer cover.

[0010] Further, the sealing plate is installed on the top of the outer cover through threaded parts.

[0011] Further, through holes are provided on the sealing plate, and the upper end of the sealing rod passes through the through holes and extends to the outside of the outer cover.

[0012] Further, a pull ring is installed at the upper end of the sealing rod.

[0013] Further, a limiting step is provided on the side wall of the sealing rod.

[0014] Further, an interface is installed inside each air inlet hole, and the interface includes a static pressure interface and a total pressure interface.

[0015] The beneficial effects of the present utility model include: The present utility model provides an emergency air release valve, which realizes relatively uniform air release in each pressure channel, has extremely low operation difficulty, and avoids certain degree of damage to sensitive components of related expensive airborne equipment. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an emergency air release valve according to an embodiment of the present utility model;

[0017] Figure 2 is a front view of an emergency air release valve according to an embodiment of the present utility model;

[0018] Figure 3 is a sealing state diagram of an emergency air release valve according to an embodiment of the present utility model;

[0019] Figure 4 is an air release state diagram of an emergency air release valve according to an embodiment of the present utility model;

[0020] In the figure: 1. Outer cover; 11. Exhaust hole; 12. Air inlet hole; 2. Sealing rod; 3. Sealing ring; 4. Sealing plate; 5. Threaded part; 6. Pull ring; 7. Static pressure interface; 8. Total pressure interface. Detailed Embodiments

[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] An embodiment of the present utility model provides an emergency air release valve, as Figure 1-2As shown in the figure, it includes an outer cover 1. The outer cover 1 is a cylindrical cover body with a hollow interior, a closed bottom, and an open top. The side wall of the outer cover 1 is provided with an exhaust hole 11 and a plurality of intake holes 12 that communicate with the interior of the outer cover 1. An interface is installed inside each intake hole 12. The interface includes a static pressure interface 7 and a total pressure interface 8. An active sealing rod 2 is provided inside the outer cover 1. The sealing rod 2 is cylindrical. A plurality of sealing rings 3 are provided on the side wall of the sealing rod 2 from top to bottom. The sealing rings 3 are O-rings made of silicone. A sealing plate 4 is installed at the open top of the outer cover 1 through a threaded member 5. The threaded member 5 is one of a bolt or a screw. The sealing plate 4 is a panel of an air data measuring and controlling instrument. A through hole is provided on the sealing plate 4. The upper end of the sealing rod 4 passes through the through hole and is installed with a pull ring 6.

[0023] In this embodiment, as Figure 3 shown, the static pressure interface 7 and the total pressure interface 8 are respectively connected to a pneumatic excitation source. A plurality of annular grooves are provided on the sealing rod 2, and sealing rings 3 are installed inside the plurality of annular grooves. The outer diameter of the sealing ring 3 is 0.5 mm smaller than the inner diameter of the outer cover 1. When the lower end of the sealing rod 2 is pressed down to the bottom of the outer cover 1, the positions of the plurality of sealing rings 3 are staggered from the exhaust hole 11 and the plurality of intake holes 12. The sealing ring 3 seals and isolates between the exhaust hole 11 and the plurality of intake holes 12. At this time, the emergency air release valve is in a pressed-down sealing state.

[0024] In this embodiment, as Figure 4 shown, the sealing rod 4 is manually pulled up through the pull ring 8. Since a limiting step 21 is provided on the outer wall of the sealing rod 2, when the sealing rod 2 is pulled up until the limiting step 21 contacts the sealing plate 4, at this time, the plurality of sealing rings 3 are respectively opposite to the exhaust hole 11 and the plurality of intake holes 12. At this time, the static pressure interface 7 and the total pressure interface 8 can be communicated through the gap between the sealing ring 3 and the intake hole 12, ensuring that the pressure difference between each pressure measuring air path is limited within a small pressure range. At the same time, the only channel for generating a pressure balance effect is the gap between the sealing ring 3 and the intake hole 11, which can limit the air flow rate, reduce the pressure change rate, and protect the airborne precision sensor. When the pressures of the static pressure interface 7 and the total pressure interface 8 are in dynamic balance, both the static pressure interface 7 and the total pressure interface 8 can be communicated with the outside atmosphere through the gap between the sealing ring 4 and the exhaust hole 11, enabling each air path to release air to the outside atmosphere synchronously to a certain extent. At the same time, the only channel for releasing air to the outside atmosphere is the gap between the sealing ring 4 and the exhaust hole 11, which can limit the air flow rate, reduce the overall pressure change rate, prevent pressure shock, and protect the airborne precision sensor.

[0025] The emergency air release valve of the embodiment of the present utility model realizes relatively uniform air release for each pressure channel, with extremely low operation difficulty, and avoids certain damage to sensitive components of related expensive airborne equipment.

[0026] The specific implementation manners of the present utility model described above do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An emergency air release valve, characterized in that: The invention comprises an outer cover (1), wherein the outer cover (1) is hollow inside, and the side wall of the outer cover (1) is provided with an exhaust hole (11) and a plurality of air inlet holes (12) in sequence from top to bottom, which are connected to the inside of the outer cover (1); a movable sealing rod (2) is provided inside the outer cover (1), and the side wall of the sealing rod (2) is provided with a plurality of sealing rings (3) in sequence from top to bottom; when the sealing rod (2) moves to a position where the plurality of sealing rings (3) are respectively offset from the positions of the exhaust hole (11) and the plurality of air inlet holes (12), the sealing rings (3) seal and isolate the exhaust hole (11) and the plurality of air inlet holes (12); when the sealing rod (2) moves to a position where the plurality of sealing rings (3) are respectively opposite to the positions of the exhaust hole (11) and the plurality of air inlet holes (12), gaps are formed between the outer walls of the plurality of sealing rings (3) and the inner walls of the exhaust hole (11) and the plurality of air inlet holes (12).

2. An emergency air release valve according to claim 1, characterized in that: The outer cover (1) is closed at the bottom and open at the top.

3. An emergency air release valve according to claim 2, characterized in that: A sealing plate (4) is installed at the top opening of the outer cover (1).

4. An emergency air release valve according to claim 3, characterized in that: The sealing plate (4) is mounted on the top of the outer cover (1) via a threaded member (5).

5. The emergency air release valve according to claim 3, characterized in that: The sealing plate (4) is provided with a through hole, and the upper end of the sealing rod (2) passes through the through hole and extends to the outside of the outer cover (1).

6. The emergency air release valve according to claim 1, characterized in that: A pull ring (6) is installed on the upper end of the sealing rod (2).

7. An emergency air release valve according to claim 1, characterized in that: The side wall of the sealing rod (2) is provided with a limiting step (21).

8. The emergency air release valve according to claim 1, characterized in that: Each air inlet (12) is internally provided with an interface, wherein the interface comprises a static pressure interface (7) and a total pressure interface (8).

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