WO2021036477A1

WO2021036477A1 - Ground test bench for aircraft oxygen system

Info

Publication number: WO2021036477A1
Application number: PCT/CN2020/098993
Authority: WO
Inventors: 冯强龙; 夏广勇
Original assignee: 南京星合精密智能制造研究院有限公司
Priority date: 2019-08-29
Filing date: 2020-06-29
Publication date: 2021-03-04

Abstract

A ground test bench for an aircraft oxygen system, comprising a box body (1) and a box cover (2) hinged to the box body (1). One side surface wall of the box body (1) is communicated with an air inlet tube (5) and an air outlet tube (6); the top of the box body (1) is communicated with an air averaging tube (11); the air averaging tube (11) is provided with an air release valve (12); the top of the air averaging tube (11) is provided with a connection tube (13); a limiting rod (17) of which a side end surface is "L"-shaped is rotatably connected to the top of an outer surface of the box cover (2); a spring (18) is fixedly connected to one side, close to the box cover (2), of a top surface wall of the box body (1); a sliding block (19) is fixedly connected to a telescopic end of the spring (18); a triangular prism-shaped limiting block (20) is welded on the top of the sliding block (19). The air release valve (12) on the air averaging tube (11) is first opened before the box cover (2) is opened, so that air pressure inside the box body (1) is the same as the outside, and the case of difficulty in opening the box cover (2) due to the inconsistence of internal air pressure and external air pressure is avoided; meanwhile, a filter screen (14) can filter large particle substances to prevent the air averaging tube (11) from being blocked; the clamping of the limiting block (20) and the limiting rod (17) has a fixing function to prevent the box cover (2) from being opened during operation; the limiting block (20) is pushed before cleaning so that the limiting block is separated from the limiting rod (17), and thus the limiting rod (17) can rotate to open the box cover (2), thereby facilitating cleaning the interior of the box body (1) and preventing bacteria breeding inside the box body (1).

Description

Ground test bench for aircraft oxygen system

Technical field

The utility model relates to the technical field of aircraft oxygen systems, in particular to a ground test bench for aircraft oxygen systems.

Background technique

Aircraft oxygen system refers to personal protective equipment that ensures that the aircraft crew can inhale enough oxygen to prevent hypoxia during high-altitude flight or emergency situations. The oxygen source is mainly gaseous oxygen, followed by liquid oxygen, and some large passenger aircraft also use solid oxygen sources. The oxygen regulator automatically adjusts the oxygen supply pressure, flow rate and oxygen percentage according to certain rules in accordance with the changes in flight altitude to meet the physiological needs of human breathing and body surface pressure.

The aircraft oxygen system needs to be tested to test its performance before assembling the aircraft. However, the existing aircraft oxygen system ground test bench still has shortcomings. The test bench needs to adjust the air pressure in a closed cabin during the test. Most of the sealed cabins with test benches adopt an integrated design, which causes dust to easily enter when the air is exhausted. Due to the integrated design, it is impossible to clean the sealed cabin to remove the dust.

technical problem

In order to solve the problem that the sealed compartment of the existing aircraft oxygen system ground test bench is not easy to clean, a ground test bench for the aircraft oxygen system is proposed.

Technical solutions

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

A ground test bench for an aircraft oxygen system, comprising a box body and a box cover hinged to the box body, one side surface wall of the box body is connected with an air inlet pipe and an air outlet pipe, and the top of the box body is connected with a gas uniform pipe, The air homogenization pipe is provided with a bleed valve, the top of the air homogenization pipe is provided with a connecting pipe, and the top of the outer surface of the box cover is rotatably connected with a limit rod with a side end surface in the shape of "L". The side of the surface wall close to the box cover is fixedly connected with a spring, the telescopic end of the spring is fixedly connected with a sliding block, and the top of the sliding block is welded with a triangular prism-shaped limit block.

As a further description of the above technical solution:

The sliding block is slidably connected with the top surface wall of the box body, and the limiting rod can be clamped with the limiting block.

As a further description of the above technical solution:

The end faces of the box body and the box cover close to each other are respectively provided with a groove and a sealing gasket, and the sealing gasket is made of rubber material and can be attached to the inner surface of the groove.

As a further description of the above technical solution:

The air homogenizing pipe is screwed and connected with the connecting pipe through a screw thread, and the top of the connecting pipe is provided with a filter screen.

As a further description of the above technical solution:

The outer surface wall of one side of the box body is bolted with an air pump, the air inlet end of the air pump is connected with the inside of the box body, and the air outlet end of the air pump is communicated with the inside of the box body through a three-way valve.

As a further description of the above technical solution:

A partition is welded on the inner central axis of the box body, the inner surface walls on both sides of the box body are fixedly connected with a shell, and the inside of the two shells is provided with an air pressure sensor.

As a further description of the above technical solution:

The surfaces of the two shells are both provided with a plurality of through holes.

Beneficial effect

1. In the present utility model, a box cover is provided on one side of the box body, a gas homogenizing pipe is installed on the top of the box body, a vent valve is installed on the gas homogenizing pipe, a connecting pipe is installed on the top of the gas transport pipe, and a filter is installed inside the connecting pipe. Net, the outer surface of the box cover is provided with a limit rod, the inner surface of the box cover is provided with a gasket, the top of the box body is provided with a spring, the telescopic end of the spring is provided with a slider, and the top of the slider is provided with a limit block. The front face of the box is provided with a groove. The advantages of this design are: First, the air release valve on the air homogenizing pipe is opened before opening the box cover, so that the air pressure inside the box is the same as the outside, preventing the internal and external air pressure from being different. The lid is difficult to open, and the filter screen can filter large particles to prevent the air pipe from being blocked; second, the limit block and the limit rod are clamped to play a fixed role to prevent the cover from opening during work and push it before cleaning The limit block is separated from the limit rod, and the limit rod can be rotated to open the box cover, which facilitates the cleaning of the inside of the box and prevents bacteria from growing inside the box.

2. In the present utility model, an air pump is provided on one side wall of the box body, one side of the air pump is connected with the box body through a three-way valve, and the other side surface wall of the box body is provided with an air inlet pipe and an air outlet pipe. There is a partition inside, the inner surface of the box is provided with a shell, the inside of the shell is provided with an air pressure sensor, and the surface of the shell is provided with multiple through holes. The advantages of this design are: First, through the partition Divide the space in the box into two, and the air pressure sensors on both sides detect the air pressure respectively to adjust the oxygen system of the aircraft to test the performance; second, the shell outside the air pressure sensor can prevent the circulating wind from affecting the detection, thereby improving the accuracy of the detection.

Description of the drawings

Figure 1 shows a schematic diagram of the outer structure of a box provided according to an embodiment of the present invention;

Figure 2 shows a schematic diagram of a connection structure between a box cover and a box body according to an embodiment of the present utility model;

Figure 3 shows a schematic diagram of the internal cross-sectional structure of the box provided according to an embodiment of the present invention;

Fig. 4 shows a schematic diagram of the connection structure between the air homogenizing pipe and the connecting pipe provided according to an embodiment of the present invention.

illustration:

1. Box body; 2. Box cover; 3. Air pump; 4. Three-way valve; 5. Air inlet pipe; 6. Air outlet pipe; 7. Shell; 8. Air pressure sensor; 9. Through hole; 10. Partition plate; 11. Uniform air pipe; 12. Vent valve; 13. Connecting pipe; 14. Filter screen; 15. Groove; 16. Seal; 17. Limit rod; 18. Spring; 19. Slider; 20. Limit block .

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

The model of the air pressure sensor used in the utility model is PXM409, and it can be purchased from the market.

Please refer to Figures 1-4, this utility model provides a technical solution: a ground test bench for an aircraft oxygen system, comprising a box body 1 and a box cover 2 hinged to the box body 1, and a side surface wall of the box body 1 is connected There is an air inlet pipe 5 and an air outlet pipe 6, the top of the box body 1 is connected with a gas uniform pipe 11, the uniform gas pipe 11 is provided with a vent valve 12, the top of the uniform gas pipe 11 is provided with a connecting pipe 13, and the top of the outer surface of the box cover 2 is connected by rotation There is a limit rod 17 with a side end surface in the shape of "L". The top surface wall of the box body 1 is fixedly connected to the side close to the box cover 2 with a spring 18, and the telescopic end of the spring 18 is fixedly connected with a slider 19, A triangular prism-shaped limit block 20 is welded on the top. The sliding block 19 is slidably connected with the top surface wall of the box body 1. The limit rod 17 can be clamped with the limit block 20. The limit rod 17 and the limit block 20 are clamped. Then, the box body 1 and the box cover 2 are fixed, and the slider 19 is pressed by the spring 18 to prevent the slider 19 from being touched by mistake and cause the limit rod 17 and the limit block 20 to separate, thereby improving the safety of the test bench.

Specifically, as shown in Figures 1 and 2, the end faces of the box body 1 and the box cover 2 close to each other are respectively provided with a groove 15 and a sealing gasket 16. The sealing gasket 16 is made of rubber and can interact with the inner surface of the groove 15 Fitting, the gasket 16 and the groove 15 are completely fitted, which improves the sealing performance of the box body 1 and the box cover 2 and helps to improve the accuracy of the test.

Specifically, as shown in Figs. 3 and 4, the air homogenizing pipe 11 is screwed and connected to the connecting pipe 13 through threads. The top of the connecting pipe 13 is provided with a filter screen 14 which can filter large particles to prevent the air homogenizing pipe 11 from clogging.

Specifically, as shown in Fig. 3, an air pump 3 is bolted to the outer wall of one side of the box body 1, the air inlet end of the air pump 3 communicates with the inside of the box body 1, and the air outlet end of the air pump 3 is connected to the box body through a three-way valve 4 The inside of the box 1 is connected, and the air pump 3 is used to change the air pressure inside the box 1 for testing with the oxygen system of the aircraft.

Specifically, as shown in Figures 1 and 3, a partition plate 10 is welded to the inner central axis of the box body 1, and the inner surface walls on both sides of the box body 1 are fixedly connected to the shell 7, and the insides of the two shells 7 Both are equipped with an air pressure sensor 8, and the surfaces of the two housings 7 are provided with a plurality of through holes 9. The housing 7 can reduce the influence of the circulating wind on the air pressure sensor 8 and help improve the accuracy of detection.

Working principle: When in use, the air pump 3 is connected to the mains. First, connect the aircraft oxygen system to the air inlet pipe 5 and the air outlet pipe 6, turn on the air pump 3, adjust the partition 10, and set the air pressure on the side of the air pump 3, and change it in the air pump 3. When the air pressure inside the box 1 is connected to the outside world, the air is sucked in or discharged. When the air pressure inside the box 1 reaches a preset value, the three-way valve 4 communicates with the box 1, so that the air inside the box 1 The gas circulates through the air pump 3, and the air pressure sensor 8 is always in working condition, real-time feedback of the air pressure value in the box 1; then, according to the air pressure value on the side of the air pump 3, the air pressure of the aircraft oxygen system is adjusted, which is also detected by the air pressure sensor 8. Until the air pressure values of the two air pressure sensors 8 are the same; secondly, when the test bench needs to be cleaned, open the bleed valve 12 to keep the air pressure inside the box 1 in balance with the outside, because the connecting pipe 13 and the air homogenizing pipe 11 are connected by screwing , And then rotate the connecting pipe 13 to remove it, and then flush the filter screen 14, then push the limit block 20 to compress the spring 18 to separate the limit rod 17 from the limit block 20, and then rotate the limit rod 17 to pass Rotate the box cover 2 to open the box body 1, and then the inside of the box body 1 can be cleaned; finally, after the cleaning is completed, rotate the box cover 2 to make the gasket 16 enter the inside of the groove 15, and then rotate the limit rod 17, The limit rod 17 will contact and push the limit block 20 to move, so that the spring 18 is compressed, until the spring 18 pushes the slider 19 to make the limit block 20 and the limit rod 17 clamp, and then complete the sealing of the box 1, through the above The steps can solve the problem that the sealed cabin of the existing aircraft oxygen system ground test bench is not easy to clean.

The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited to this. Anyone familiar with the technical field within the technical scope disclosed by the present utility model, according to the present utility model The technical solutions of the new type and the concept of the utility model to be equivalently replaced or changed shall be covered by the scope of protection of the present utility model.

Claims

A ground test bench for an aircraft oxygen system, comprising a box body (1) and a box cover (2) hinged to the box body (1), and an air inlet pipe (5) is connected to one side surface wall of the box body (1) And the air outlet pipe (6), characterized in that the top of the box body (1) is connected with a uniform air pipe (11), the uniform air pipe (11) is provided with an air relief valve (12), the uniform air pipe (11) ) Is provided with a connecting pipe (13) at the top, the top of the outer surface of the box cover (2) is rotatably connected with a limit rod (17) with a side end surface in the shape of "L", and the top surface of the box (1) The side of the wall close to the box cover (2) is fixedly connected with a spring (18), the telescopic end of the spring (18) is fixedly connected with a sliding block (19), and the top of the sliding block (19) is welded with a triangular prism Limit block (20).
The ground test bench for an aircraft oxygen system according to claim 1, wherein the sliding block (19) is slidably connected to the top surface wall of the box body (1), and the limit rod (17) can be Connect with the limit block (20).
The ground test bench for an aircraft oxygen system according to claim 1, characterized in that the end faces of the box body (1) and the box cover (2) close to each other are respectively provided with grooves (15) and gaskets ( 16) The sealing gasket (16) is made of rubber material and can be attached to the inner surface of the groove (15).
The ground test bench for an aircraft oxygen system according to claim 1, wherein the air homogenizing pipe (11) is screwed and connected to the connecting pipe (13) by threads, and the top of the connecting pipe (13) is provided with There is a filter (14).
The ground test bench for an aircraft oxygen system according to claim 1, characterized in that the outer surface wall of one side of the box body (1) is bolted with an air pump (3), and the air pump (3) is connected to the air pump (3). The air end is communicated with the inside of the box body (1), and the air outlet end of the air pump (3) is communicated with the inside of the box body (1) through a three-way valve (4).
The ground test bench of an aircraft oxygen system according to claim 1, characterized in that a partition (10) is welded at the inner central axis of the box (1), and the inner sides of the box (1) are The surface walls are fixedly connected with a shell (7), and the inside of the two shells (7) is provided with an air pressure sensor (8).
The ground test bench for an aircraft oxygen system according to claim 6, characterized in that the surfaces of the two shells (7) are each provided with a plurality of through holes (9).