Multifunctional gas pressure reduction conversion device for cabin airtightness

Abstract

The utility model belongs to the technical field of aviation electromechanical design, and relates to a multifunctional gas decompression conversion device for cabin airtightness, which is arranged between an onboard gas source and an airtight rubber belt. Comprising a water removal device, a gas storage bottle and an airtight change-over valve which are sequentially connected through a pipeline, a ground air source is selectively connected to the front end of the water removal device through a pipeline connector. The device integrates gas pressure reduction, gas path airtight conversion and pressure feedback, reduces the number of products, and is convenient to manage and maintain. The air storage function is achieved, the air bottle is arranged, under the condition that an air source on the aircraft is interrupted, stored air can continue to keep the airtight function of the canopy, and the reliability of the system is greatly improved. A water removing function is achieved, water is removed from an onboard air source or a ground air source entering an airtight system, and the water is prevented from influencing follow-up devices and pipelines. In daily maintenance, a ground air source can be directly utilized to inflate the device, the device is used for cabin air tightness inspection, an onboard air source does not need to be used, and maintainability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of aviation electromechanical design technology, and relates to a multifunctional gas decompression and conversion device, specifically a multifunctional gas decompression and conversion device for cabin airtightness. Background Technology

[0002] The aircraft canopy provides the pilots with access to and from the cockpit. When the canopy is closed, a certain gap exists between it and the fuselage structure. To maintain airtightness within the cockpit, this gap needs to be sealed; however, this gap is also necessary when the canopy is opened. A common practice is to install an airtight rubber strip on the canopy. This strip expands when inflated and contracts when deflated, thus sealing and releasing the canopy. When closing the canopy, the airtight rubber strip needs to be inflated (with air or nitrogen). Since the inflation pressure required for the rubber strip to expand is low, while the pressure of the onboard air supply is high, a pressure reducer is needed to reduce the pressure. When opening the canopy, the air or nitrogen in the airtight rubber strip needs to be released promptly.

[0003] Currently, the common practice for airtight systems involves installing a pressure reducer, an airtight switch, and a pressure sensor in the air path between the onboard air source and the airtight rubber belt. The pressure reducer lowers the onboard air source pressure to the pressure required by the airtight rubber belt; the airtight switch controls the inflation or deflation of the airtight rubber belt; and the pressure sensor detects the pressure of the airtight rubber belt. The disadvantages of this approach are: 1. The onboard air source is usually a pre-filled onboard gas cylinder, which is not easily maintainable. 2. When the onboard air source fails and the airtight rubber belt is interrupted, it cannot seal, affecting the cabin's airtightness and resulting in low system reliability. 3. Existing airtight system products are numerous and scattered, reducing system reliability and making troubleshooting difficult in case of failure. Utility Model Content

[0004] Purpose of the utility model: This utility model designs a multifunctional gas decompression and conversion device for cabin airtightness. This device does not rely on pre-filled onboard gas cylinders, has a high degree of integration, and features functions such as water removal, gas storage, gas decompression, gas path airtightness conversion, pressure feedback, and ground-based inflation. It reduces the number of airtight system components and improves the reliability and maintainability of the airtight system.

[0005] Technical Solution: This utility model integrates some products that achieve cockpit airtightness and adds some new functions. It proposes a multi-functional gas depressurization and conversion device for cockpit airtightness, arranged between the onboard air source and the airtight rubber belt; it includes a dewatering device, an air storage cylinder, and an airtight conversion valve connected sequentially by pipelines; the dewatering device is also selectively connected to a ground air source via a pipeline connector at its front end.

[0006] Furthermore, the airtight switching valve is composed of a pressure reducer and an airtight switch connected in series to realize gas pressure reduction, gas path switching, and feedback of the gas filling and discharging position. At the same time, it can maintain the gas filling and discharging position in the event of power failure.

[0007] Furthermore, the pressure reducer reduces the higher pressure from the air source to the low pressure required for the airtight rubber belt to expand.

[0008] Furthermore, the pressure reduction conversion device also includes a pressure sensor, which is arranged between the airtight conversion valve and the airtight rubber belt to feed back the pressure after the pressure reduction device reduces pressure to the aircraft.

[0009] Furthermore, the gas pressure reduction and conversion device includes two one-way inflation nozzles, which are arranged at the inflation end on the machine and the gas source end on the ground, and prevent gas backflow.

[0010] Furthermore, a one-way valve is installed on the pipeline between the water removal device and the on-board air source.

[0011] When inflating on-machine, the gas storage cylinder can store gas from the on-machine gas source as a backup gas source. When the on-machine gas source fails and stops supplying gas, the gas storage cylinder can directly supply gas to the airtight rubber belt. When inflating on the ground, the gas storage cylinder acts as an inflation cylinder and directly supplies gas to the airtight rubber belt.

[0012] Technical effects: This utility model has the following design features,

[0013] 1) It integrates gas pressure reduction, gas path airtightness conversion, and pressure feedback, reducing the number of products and facilitating management and maintenance.

[0014] 2) It has an air storage function: It comes with its own air cylinder, which can maintain the airtight function of the cockpit canopy in the event of an interruption of the air supply on the aircraft, greatly improving the reliability of the system.

[0015] 3) It has a water removal function: it removes water from the air source on the aircraft or ground that enters the airtight system to prevent water from affecting subsequent devices and pipelines.

[0016] 4) Ground inflation function: During routine maintenance, the device can be directly inflated using a ground air source for cabin air tightness checks, eliminating the need for an onboard air source and improving maintainability.

[0017] 5) It has a power failure position self-holding function: when the machine is powered off, the airtight switch can maintain the previous position and continue to inflate or deflate.

[0018] 6) No pre-inflation by ground crew is required before flight, improving the maintainability of the airtight system. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the air passage layout from the air source to the airtight rubber belt in this utility model;

[0020] Figure 2 This is a block diagram illustrating the structural principle of the multifunctional gas pressure reducing and conversion device of this utility model. Detailed Implementation

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of this utility model, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0022] See appendix Figure 1 , 2 The structure of the multifunctional gas pressure reduction and conversion device designed in this utility model includes a water removal device, a gas storage cylinder, an airtight conversion valve, and a pressure sensor, realizing the functions of water removal, gas storage, gas pressure reduction, airtight conversion of the gas path, pressure feedback, and ground inflation. Its normal working process is as follows: Air from the aircraft or ground source (3-5 MPa) passes through a one-way valve, enters a dehydration device to remove water, and then enters a gas storage cylinder for storage. The pressure reducer reduces the gas pressure (3-5 MPa) to the set value (176 kPa-251 kPa). The gas after pressure reduction from the pressure reducer enters the airtight switch. The airtight switch has two positions: the filling position and the venting position. When the airtight switch is in the filling position, the air inlet and outlet of the airtight switch are connected, and the air outlet and venting port are connected. The gas enters the airtight rubber belt after being detected by the pressure sensor. When the airtight switch is in the venting position, the air outlet and venting port of the airtight switch are connected, and the air inlet and outlet are not connected. The airtight rubber belt is connected to the atmosphere, and the gas in the airtight rubber belt flows into the atmosphere.

[0023] The ground inflation process is as follows: During ground inflation, the airtight switch is in the inflation position, and air or nitrogen (3-5 MPa) is directly injected into the gas storage cylinder through the ground inflation nozzle. After inflation is complete, the gas stored in the gas storage cylinder is used to inflate the airtight rubber belt, the process being the same as the normal operation process.

[0024] In addition to the above structural principles, the dehydration device can also be integrated with the gas storage cylinder. For example, the gas storage cylinder can be filled with 4A or 5A molecular sieves to achieve the dual functions of gas storage and dehydration; the gas storage cylinder can also be placed on a branch of the gas path of the airtight system.

[0025] The above specific embodiments or examples are only used to explain the technical solutions of this utility model and are not intended to limit this application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of this application, adaptive modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications, equivalent substitutions, and adaptive improvements do not depart from the technical essence of this utility model and should all be covered within the protection scope of this application.

Claims

1. A multifunctional gas decompression and conversion device for cabin airtightness, characterized in that, The pressure reduction and conversion device is located between the onboard air source and the airtight rubber belt; it includes a dewatering device, an air storage cylinder, and an airtight conversion valve connected in sequence through pipelines; the dewatering device is also selectively connected to the ground air source through a pipeline joint at the front end.

2. The multifunctional gas decompression and conversion device for cabin airtightness as described in claim 1, characterized in that, The airtight switching valve consists of a pressure reducer and an airtight switch connected in series. It realizes gas pressure reduction, gas path switching, and feedback of gas filling and discharging position. At the same time, it can maintain the gas filling and discharging position in the event of power failure.

3. A multifunctional gas decompression and conversion device for cabin airtightness as described in claim 2, characterized in that, The pressure reducer reduces the higher pressure from the air source to the low pressure required for the airtight rubber belt to expand.

4. A multifunctional gas decompression and conversion device for cabin airtightness as described in claim 1, characterized in that, The pressure reduction conversion device also includes a pressure sensor, which is arranged between the airtight conversion valve and the airtight rubber belt to feed back the pressure after the pressure reduction device reduces pressure to the aircraft.

5. A multifunctional gas decompression and conversion device for cabin airtightness as described in claim 1 or 4, characterized in that, The pressure reduction and conversion device includes two one-way air inlets, which can be arranged at the air inlet on the machine and the air source end on the ground, and prevent gas backflow.

6. A multifunctional gas decompression and conversion device for cabin airtightness as described in claim 1, characterized in that, A one-way valve is also installed on the pipeline between the water removal device and the air source on the machine.

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