Emergency hydraulic power unit with dual-channel unloading for aircraft

Abstract

The utility model belongs to aviation hydraulic structure technical field discloses an emergency hydraulic energy system of airplane with double passage unloading, including pressure accumulator subassembly, emergency hydraulic user, main hydraulic energy system, oil supply channel and oil return channel, and main hydraulic energy system is equipped with oil supply end and oil return end, and the oil supply end of main hydraulic energy system is connected the oil supply port of emergency hydraulic user through oil supply channel, and the oil return end of main hydraulic energy system is connected the oil return port of emergency hydraulic user through oil return channel, and pressure accumulator subassembly connects oil supply channel, and still be equipped with pressure relief subassembly between oil supply channel and oil return channel. When main hydraulic energy system fails, can provide energy to emergency hydraulic user, and simultaneously, the system has high pressure automatic unloading and maintenance manual unloading function, so that the utility model has greatly improved the safety and maintainability of system.

Description

Technical Field

[0001] This utility model belongs to the field of aviation hydraulic structure technology, and relates to an accumulator unloading system, specifically an emergency hydraulic energy system for aircraft with dual-channel unloading. Background Technology

[0002] Using accumulators as energy storage devices for emergency hydraulic power systems on aircraft is a common practice. These systems have a key characteristic: to maintain the high-pressure hydraulic fluid stored in the accumulator, it is located in a closed pipeline. When the ambient temperature on board continuously rises, the high-pressure gas in the accumulator expands due to heat, causing the high-pressure hydraulic fluid pressure to rise continuously. Therefore, an automatic unloading function is required to prevent the pipeline from rupturing due to the continuously rising pressure. Furthermore, because this emergency hydraulic power system is a closed system, when ground maintenance is required, the pipeline pressure must be released first to prevent the danger of ground personnel disassembling the pipeline while it is under pressure. Therefore, an emergency hydraulic power system that can automatically unload under high pressure and manually unload during ground maintenance is needed to improve the safety and maintainability of the hydraulic system. Utility Model Content

[0003] Therefore, this utility model provides an emergency hydraulic energy system for aircraft with dual-channel unloading, which can realize the high-pressure automatic unloading and manual unloading functions during maintenance. At the same time, in the event of a failure of the main hydraulic energy system, the system can provide hydraulic energy to the onboard emergency hydraulic users, such as to realize emergency braking and emergency feathering.

[0004] The technical solution of this utility model is as follows: An emergency hydraulic energy system for aircraft with dual-channel unloading includes an accumulator assembly, an emergency hydraulic user, a main hydraulic energy system, an oil supply channel, and a return channel. The main hydraulic energy system has an oil supply end and a return end. The oil supply end of the main hydraulic energy system is connected to the oil supply port of the emergency hydraulic user through the oil supply channel, and the return end of the main hydraulic energy system is connected to the return port of the emergency hydraulic user through the return channel. The accumulator assembly is connected to the oil supply channel, and a pressure relief assembly is also provided between the oil supply channel and the return channel.

[0005] Furthermore, the oil supply channel is provided with an inlet check valve, a first three-way passage, a pressure sensor, and a second three-way passage in sequence from the oil supply end of the main hydraulic energy system to the oil supply port of the emergency hydraulic user; the pressure relief assembly is connected to the first three-way passage, and the accumulator assembly is connected to the second three-way passage.

[0006] Furthermore, the return oil channel is equipped with a return oil check valve and a third three-way passage in sequence from the return oil port of the emergency hydraulic user to the return oil end of the main hydraulic energy system; the pressure relief component is connected to the third three-way passage.

[0007] Furthermore, the pressure relief assembly includes a manual unloading valve and a safety valve connected in parallel.

[0008] Furthermore, the accumulator assembly includes an accumulator, an air filling valve, and a pressure sensor. The air chamber of the accumulator is connected to the air filling valve and the pressure sensor, and the oil chamber of the accumulator is connected to the oil supply channel.

[0009] Furthermore, the accumulator is a piston-type accumulator, and the gas chamber of the accumulator contains nitrogen.

[0010] Technical effects: This invention achieves manual unloading function through a manual unloading valve integrated into the pressure relief component. The manual unloading valve is equipped with a manual rotary switch with "Stop" and "Unload" markings, corresponding to the "Disconnect" and "Connect" positions of the manual unloading valve, respectively. When the emergency hydraulic energy system needs ground maintenance, the rotary switch of the manual unloading valve is moved to the "Unload" position to put the valve in the "Connect" state. At this time, the high-pressure oil line and the return oil line of the system are connected, and the system pressure will continue to decrease until it approaches 0MPa. After the ground maintenance work is completed, the rotary switch of the manual unloading valve is moved to the "Stop" position to put the valve in the "Disconnect" state. The high-pressure oil line and the return oil line of the system are disconnected, and the system pressure can be maintained.

[0011] This invention provides an emergency hydraulic energy system for aircraft with dual-channel unloading. When the main hydraulic energy system fails, it can provide energy to emergency hydraulic users. At the same time, the system has high-pressure automatic unloading and maintenance manual unloading functions, which greatly improves the safety and maintainability of the system. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the dual-channel unloading emergency hydraulic energy system of this utility model; Among them, 1-manual unloading valve, 2-safety valve, 3-oil inlet check valve, 4-oil return check valve, 5-pressure sensor, 6-accumulator, 7-air charging valve, 8-air pressure sensor. Detailed Implementation

[0013] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. Numerous specific design details are set forth in the following detailed description to provide a more complete understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific setup and method set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and device without departing from the spirit of this utility model. In the drawings and the following description, any parts not exhaustively described are considered to be common knowledge or conventional practices in the art.

[0014] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] Example 1: An emergency hydraulic energy system for aircraft with dual-channel unloading includes an accumulator assembly, an emergency hydraulic user, a main hydraulic energy system, an oil supply channel, and a return channel. The main hydraulic energy system has an oil supply end and a return end. The oil supply end of the main hydraulic energy system is connected to the oil supply port of the emergency hydraulic user through the oil supply channel, and the return end of the main hydraulic energy system is connected to the return port of the emergency hydraulic user through the return channel. The accumulator assembly is connected to the oil supply channel, and a pressure relief assembly is also provided between the oil supply channel and the return channel.

[0016] The oil supply channel is provided with an inlet check valve 3, a first three-way passage, a pressure sensor 5, and a second three-way passage in sequence from the oil supply end of the main hydraulic energy system to the oil supply port of the emergency hydraulic user; the pressure relief assembly is connected to the first three-way passage, and the accumulator assembly is connected to the second three-way passage.

[0017] The return oil channel is equipped with a return oil check valve 4 and a third three-way passage in sequence from the return oil port of the emergency hydraulic user to the return oil end of the main hydraulic energy system; the pressure relief component is connected to the third three-way passage.

[0018] The pressure relief assembly includes a manual unloading valve 1 and a safety valve 2 connected in parallel.

[0019] The accumulator assembly includes an accumulator 6, an air filling valve 7, and a pressure sensor 8. The air chamber of the accumulator 6 is connected to the air filling valve 7 and the pressure sensor 8, and the oil chamber of the accumulator 6 is connected to the oil supply channel.

[0020] Accumulator 6 is a piston-type accumulator, and the gas chamber of accumulator 6 contains nitrogen.

[0021] Example 2: An emergency hydraulic energy system for aircraft with dual-channel unloading includes an expansion valve assembly I and an accumulator assembly II. The expansion valve assembly I integrates a manual unloading valve 1, a safety valve 2, an inlet check valve 3, a return check valve 4, and a pressure sensor 5. The accumulator assembly II integrates an accumulator 6, a charging valve 7, and a pressure sensor 8. The main hydraulic energy system supplies oil to the emergency hydraulic energy system through the inlet check valve 3, and the emergency hydraulic system returns oil to the main hydraulic energy system through the return check valve 4. The pressure sensor 5 is used to provide feedback on the pressure of the emergency hydraulic energy system. The manual unloading valve 1 and the safety valve 2 are used to connect the system's pressure pipeline and return pipeline.

[0022] The oil chamber outlet of accumulator 6 is connected in parallel to the pressure pipeline between outlet A of expansion valve assembly I and emergency hydraulic user. The air filling valve 7 is used to fill or release air into accumulator 6 during ground maintenance. The air pressure sensor 8 is used to monitor the air chamber pressure of accumulator 6. The normal filling pressure of accumulator 6 is (8~8.5) MPa. When the filling pressure of accumulator 6 is lower than 8 MPa, it reminds ground personnel to fill accumulator 6.

[0023] The working process of an aircraft emergency hydraulic power system provided by this invention is as follows: Step 1: After the aircraft starts its engine on the ground, the main hydraulic power system pressurizes to 21MPa. At the same time, the main hydraulic power system supplies pressure to the emergency hydraulic power system through the oil inlet check valve 3. The high-pressure oil enters the oil chamber of the accumulator 6 and pushes its piston to compress the gas in the gas chamber until the pressure reaches 21MPa. Due to the one-way flow function of the oil inlet check valve 3, the high-pressure oil stored in the accumulator 6 will not flow back into the main hydraulic power system and can be used as an emergency hydraulic power source. Step 2: When the main hydraulic power system fails, the high-pressure oil stored in the accumulator 6 is released to supply the emergency hydraulic user, and the return oil from the emergency hydraulic user is returned to the main hydraulic power system through the return oil check valve 4. In this step, pressure sensor 5 feeds back the pressure information of the emergency hydraulic power system to the cockpit reference page, which can be monitored by the pilot in real time.

[0024] This invention features an automatic high-pressure unloading function, and its operating conditions are as follows: The high-pressure automatic unloading function is achieved through safety valve 2. The opening pressure of safety valve 2 is set to 26MPa~26.5MPa, and the closing pressure is set to 23MPa~23.5MPa. When the ambient temperature on the machine continues to rise, the gas in the gas chamber of accumulator 6 expands due to heat, causing the pressure of the emergency hydraulic energy system to rise continuously. When the system pressure is higher than 26MPa, safety valve 2 will automatically open to unload. When the system pressure is unloaded to below 23MPa, safety valve 2 will automatically close. The closing pressure of safety valve 2, 23MPa~23.5MPa, is higher than the rated working pressure of the system, 21MPa, which can ensure that the pressure of the emergency energy system will not be too low due to the automatic unloading of the safety valve.

[0025] This invention features a manual unloading function, with the following operating conditions: The manual unloading function is achieved through the manual unloading valve 1, which is a two-position, two-way hydraulic valve with two positions: "off" and "on". It can be controlled by a manual rotary switch on the manual unloading valve 1, which has "stop" and "unload" positions, corresponding to the "off" and "on" positions of the valve, respectively. When the system needs to be maintained on the ground, the rotary switch is operated to the "unload" position to put the manual unloading valve 1 in the "on" position. At this time, the high-pressure oil line and the return oil line of the system are connected, and the system pressure will continue to decrease until it approaches 0MPa. After the ground maintenance work is completed, the rotary switch is operated to the "stop" position to put the manual unloading valve 1 in the "off" position, and the high-pressure oil line and the return oil line of the system are disconnected, so that the system pressure can be maintained.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. An emergency hydraulic power system for aircraft with dual-channel unloading, characterized in that, It includes an accumulator assembly, an emergency hydraulic user, a main hydraulic power system, an oil supply channel, and an oil return channel. The main hydraulic power system has an oil supply end and an oil return end. The oil supply end of the main hydraulic power system is connected to the oil supply port of the emergency hydraulic user through the oil supply channel, and the oil return end of the main hydraulic power system is connected to the oil return port of the emergency hydraulic user through the oil return channel. The accumulator assembly is connected to the oil supply channel, and a pressure relief assembly is also provided between the oil supply channel and the oil return channel.

2. The emergency hydraulic energy system for aircraft with dual-channel unloading as described in claim 1, characterized in that, The oil supply channel is provided with an inlet check valve (3), a first three-way passage, a pressure sensor (5), and a second three-way passage in sequence from the oil supply end of the main hydraulic energy system to the oil supply port of the emergency hydraulic user; the pressure relief assembly is connected to the first three-way passage, and the accumulator assembly is connected to the second three-way passage.

3. The emergency hydraulic energy system for aircraft with dual-channel unloading as described in claim 1, characterized in that, The return oil channel is provided with a return oil check valve (4) and a third three-way passage in sequence from the return oil port of the emergency hydraulic user to the return oil end of the main hydraulic energy system; the pressure relief component is connected to the third three-way passage.

4. The emergency hydraulic energy system for aircraft with dual-channel unloading as described in claim 1, characterized in that, The pressure relief assembly includes a manual unloading valve (1) and a safety valve (2) connected in parallel.

5. An emergency hydraulic energy system for aircraft with dual-channel unloading as described in claim 1, characterized in that, The accumulator assembly includes an accumulator (6), an air filling valve (7), and a pressure sensor (8). The air chamber of the accumulator (6) is connected to the air filling valve (7) and the pressure sensor (8), and the oil chamber of the accumulator (6) is connected to the oil supply channel.

6. An emergency hydraulic energy system for aircraft with dual-channel unloading as described in claim 5, characterized in that, The accumulator (6) is a piston-type accumulator, and the gas chamber of the accumulator (6) contains nitrogen.

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