Fuel control valve for aircraft fuel tank

Abstract

The utility model discloses an aircraft fuel tank is with refueling control valve, relate to aircraft fuel system technical field, aims at solving the problem that current control valve is mostly single control mode, and there is control precision deficiency, emergency response lag, poor sealing reliability, the technical scheme who adopts is, upper casing assembly, lining ring and lower casing are connected in turn from top to bottom, and the oil passing chamber of bottom permeability is enclosed, the lower casing bottom and lateral wall are equipped with oil inlet and first oil outlet channel respectively, the oil passing chamber is equipped with upper diaphragm assembly and lower diaphragm assembly, and upper diaphragm assembly and lower diaphragm assembly divide the oil passing chamber into upper membrane chamber and lower membrane chamber, and the lower membrane chamber is connected with the float valve in the oil tank through the second oil outlet channel, and the upper membrane chamber is communicated with the inside of the oil tank through the third oil outlet channel, simultaneously has two operation modes of mechanical control and electrical control, and the action is sensitive, and the response speed is fast, and the safety margin is high, and the control precision is high, and the popularization prospect and application field are wide.

Description

Technical Field

[0001] This utility model relates to the field of aircraft fuel system technology, specifically to a refueling control valve for an aircraft fuel tank. Background Technology

[0002] Refueling control of aircraft fuel tanks is a critical component of aviation fuel systems, directly impacting flight safety and refueling efficiency. Existing refueling control valves typically only offer one method of control: mechanical or electrical. This results in issues such as insufficient control precision, delayed emergency response, and poor sealing reliability.

[0003] Some products fail to quickly shut off after a normal full-fuel shut-off, easily leading to fuel spillage. Furthermore, the diaphragm control structure of traditional valves is poorly designed, making it difficult to balance spring force and fuel pressure, affecting the timeliness and stability of shut-off. Therefore, there is an urgent need for a refueling control valve with optimized structure, precise control, and high reliability to overcome the shortcomings of existing technologies. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a refueling control valve for aircraft fuel tanks, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model discloses a refueling control valve for an aircraft fuel tank. The technical solution adopted is to include a lower housing, a bushing, and an upper housing assembly. The upper housing assembly, the bushing, and the lower housing are connected sequentially from top to bottom to form a bottom-permeable oil passage chamber. The bottom and sidewalls of the lower housing are respectively provided with an oil inlet and a first oil outlet channel; The oil passage chamber is provided with an upper diaphragm assembly and a lower diaphragm assembly, which divide the oil passage chamber into an upper diaphragm chamber and a lower diaphragm chamber. The lower diaphragm chamber is connected to the float valve in the oil tank through a second oil outlet channel, and the upper diaphragm chamber is connected to the inside of the oil tank through a third oil outlet channel. It features both mechanical and electrical control modes, and is characterized by sensitive action, fast response, high safety margin, and high control precision, making it suitable for widespread application and promotion.

[0006] As a preferred embodiment of this utility model, an installation tube is installed inside the upper housing assembly, and the upper diaphragm assembly and the lower diaphragm assembly are slidably connected to the installation tube. A spring and a washer are also provided between the upper diaphragm assembly and the upper housing assembly. In a natural state, the lower diaphragm assembly closes the first oil outlet channel under the elastic force of the spring.

[0007] As a preferred embodiment of this utility model, an oil passage is provided between the mounting tube and the lower diaphragm assembly, through which oil enters the lower diaphragm cavity; an oil passage hole is also provided on the side wall of the mounting tube, which corresponds to the position of the upper diaphragm cavity, through which oil enters the upper diaphragm cavity.

[0008] As a preferred technical solution of this utility model, the second oil outlet channel is opened on the bushing and the upper housing assembly, and multiple sets are provided. One set of the second oil outlet channel is connected to the float valve through a pipe joint, and the other sets of the second oil outlet channels are equipped with safety valves. The upper diaphragm chamber and the lower diaphragm chamber are respectively connected to the inside of the oil tank and the float valve. Combined with the sliding action of the diaphragm assembly along the mounting pipe, the opening and closing degree of the first oil outlet channel can be precisely adjusted according to the oil level and pressure signal in the oil tank, so as to achieve precise control of the refueling flow.

[0009] As a preferred embodiment of this utility model, a bushing and a sealing gasket corresponding to the position of the second oil outlet channel are further provided between the bushing ring and the upper housing assembly.

[0010] As a preferred technical solution of this utility model, a one-way valve and an exhaust solenoid valve are installed on the upper housing assembly by screws, and the third oil outlet channel is connected to the inside of the oil tank through the one-way valve and the exhaust solenoid valve; a safety valve, an exhaust solenoid valve and a one-way valve are provided to realize the functions of pressure overpressure relief, rapid gas discharge and reverse leakage prevention, respectively, and multiple safety protection mechanisms ensure the safety of the refueling process and the use of the oil tank.

[0011] As a preferred technical solution of this utility model, a plurality of connecting pins for installation and positioning are further provided between the lower housing and the bushing; Connecting pins enable precise positioning and installation of components, while check valves and exhaust solenoid valves can be detachably connected via screws, significantly reducing assembly difficulty and subsequent maintenance costs.

[0012] Compared with the prior art, the beneficial effects of this utility model are: this utility model has both mechanical control and electrical control operation modes, and the action is sensitive, the response speed is fast, the safety margin is high, the control precision is high, and the promotion prospects and application fields are wide. The lower diaphragm assembly works in conjunction with the spring to achieve a normal seal for the first oil outlet channel. The sealing gasket between the bushing and the upper housing assembly further strengthens the seal of the second oil outlet channel. The multi-seal structure effectively prevents oil leakage. The upper and lower diaphragm chambers are connected to the inside of the oil tank and the float valve, respectively. Combined with the sliding motion of the diaphragm assembly along the mounting tube, the opening and closing degree of the first oil outlet channel can be precisely adjusted according to the oil level and pressure signal in the oil tank, so as to achieve precise control of the refueling flow rate. The system is equipped with a safety valve, an exhaust solenoid valve, and a check valve, which respectively enable pressure relief, rapid gas discharge, and reverse leakage prevention. Multiple safety protection mechanisms ensure the safety of the refueling process and the use of the fuel tank. Connecting pins enable precise positioning and installation of components, while check valves and exhaust solenoid valves can be detachably connected via screws, significantly reducing assembly difficulty and subsequent maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view (AA) of the present invention; Figure 4 This is a BB cross-sectional view of the present invention; Figure 5 This is a CC cross-sectional view of the present invention; Figure 6 This is a sectional view of the present invention.

[0014] In the diagram: 1. Lower housing; 2. Lower diaphragm assembly; 3. Liner ring; 4. Upper diaphragm assembly; 5. Lower diaphragm cavity; 6. Upper housing assembly; 7. Spring; 8. Gasket; 9. Exhaust solenoid valve; 10. Check valve; 11. Upper diaphragm cavity; 12. Safety valve; 13. Connecting pin; 14. Bushing; 15. Sealing gasket; 16. Second oil outlet channel; 17. Pipe joint; 18. Oil inlet; 19. Third oil outlet channel; 20. Oil passage; 21. Oil passage hole; 22. Mounting pipe; 23. First oil outlet channel. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0016] like Figures 1 to 6 As shown, this utility model discloses a refueling control valve for an aircraft fuel tank, and the technical solution adopted is as follows: It includes a lower housing 1, a bushing 3, and an upper housing assembly 6. The upper housing assembly 6, the bushing 3, and the lower housing 1 are connected sequentially from top to bottom to form a bottom-permeable oil passage chamber. The bottom and side wall of the lower housing 1 are respectively provided with an oil inlet 18 and a first oil outlet channel 23. The oil inlet 18 is used to connect to an external refueling pipeline, and the first oil outlet channel 23 is used to deliver fuel into the fuel tank.

[0017] The oil passage chamber is equipped with an upper diaphragm assembly 4 and a lower diaphragm assembly 2, which divide the oil passage chamber into an independent upper diaphragm chamber 11 and a lower diaphragm chamber 5. The lower diaphragm chamber 5 is connected to a float valve in the oil tank through a second oil outlet channel 16, supplying oil to the float valve so that the float valve can detect the oil level in a timely manner. The upper diaphragm chamber 11 is connected to the inside of the oil tank through a third oil outlet channel 19, which is used to balance the pressure between the upper diaphragm chamber 11 and the inside of the oil tank.

[0018] An installation tube 22 is fixedly installed inside the upper housing assembly 6. The upper diaphragm assembly 4 and the lower diaphragm assembly 2 are slidably sleeved on the installation tube 22 and can move axially along the installation tube 22. A spring 7 and a washer 8 are also provided between the upper diaphragm assembly 4 and the upper housing assembly 6. The washer 8 is used to increase the stability of the connection between the spring 7 and the upper housing assembly 6. In the natural state, the lower diaphragm assembly 2 is tightly attached to the inner wall of the lower housing 1 under the elastic force of the spring 7, thereby sealing the first oil outlet channel 23.

[0019] An oil passage 20 is provided between the mounting pipe 22 and the lower diaphragm assembly 2, through which oil supplied by the external oil supply line can enter the lower diaphragm cavity 5; an oil passage 21 is also provided on the side wall of the mounting pipe 22, which corresponds to the position of the upper diaphragm cavity 11, through which oil can enter the upper diaphragm cavity 11, thereby achieving pressure regulation on both sides of the diaphragm assembly.

[0020] The second oil outlet channel 16 is provided on the bushing 3 and the upper housing assembly 6, and there are multiple sets. One set of the second oil outlet channel 16 is connected to the float valve through the pipe joint 17. The other second oil outlet channels 16 are equipped with safety valves 12. When the pressure in the lower diaphragm cavity 5 exceeds the preset threshold, the safety valve 12 automatically opens to release pressure and prevent the components from being damaged by excessive pressure.

[0021] Between the bushing 3 and the upper housing assembly 6, there is also a bushing 14 and a sealing gasket 15 corresponding to the position of the second oil outlet channel 16. The bushing 14 is used to enhance the structural strength of the second oil outlet channel 16, and the sealing gasket 15 is used to improve the sealing performance of the second oil outlet channel 16 and prevent oil leakage.

[0022] The upper housing assembly 6 is detachably mounted with a one-way valve 10 and an exhaust solenoid valve 9 via screws. The third oil outlet channel 19 is connected to the inside of the oil tank through the one-way valve 10 and the exhaust solenoid valve 9. The one-way valve 10 is used to prevent oil or gas in the oil tank from flowing back into the upper diaphragm chamber 11. The exhaust solenoid valve 9 is used to quickly discharge excess gas in the upper diaphragm chamber 11 to ensure the sensitivity of the diaphragm assembly. At the same time, after the float valve sends an emergency signal, the exhaust solenoid valve 9 closes, which increases the oil pressure in the upper diaphragm chamber 11 and pushes the upper diaphragm assembly 4 to move along the mounting pipe 22, thereby causing the lower diaphragm assembly 2 to close the first oil outlet channel 23.

[0023] Multiple sets of connecting pins 13 are also provided between the lower housing 1 and the bushing 3. The connecting pins 13 are used to achieve precise positioning and installation of the lower housing 1 and the bushing 3, while improving the stability of the connection structure and facilitating disassembly and maintenance.

[0024] The working principle of this utility model: During pressure refueling, the oil from the external refueling pipeline enters the lower housing 1 through the oil inlet 18. The oil pushes the lower diaphragm assembly 2 and the upper diaphragm assembly 4 to move along the mounting pipe 22, the spring 7 is compressed, the first oil outlet channel 23 is opened, and a large amount of oil enters the oil tank through the first oil outlet channel 23. A small amount of oil enters the lower membrane chamber 5 and the upper membrane chamber 11 through the oil passage 20 and the oil passage hole 21 respectively. The oil entering the lower membrane chamber 5 enters the float valve through the second oil outlet passage 16 and the pipe joint 17, and enters the oil tank through the overflow port on the float valve. The oil in the upper membrane chamber 11 enters the oil tank through the third oil outlet passage 19, the one-way valve 10 and the exhaust solenoid valve 9. When the oil level rises to the normal full oil level, the float valve closes and sends a normal full oil pressure signal. The pressure is transmitted to the lower diaphragm chamber 5. When the oil pressure in the lower diaphragm chamber 5 is equal to the pressure at the oil inlet 18, the lower diaphragm assembly 2 resets under the action of the oil pressure and the restoring force of the spring 7, closes the first oil outlet channel 23, cuts off the oil filling circuit, and the pressure filling ends. When the normal full-oil shut-off fails and the oil level continues to rise to the emergency oil level, the float valve sends an emergency electrical signal. At this time, the power supply to the exhaust solenoid valve 9 is turned on, and the exhaust solenoid valve 9 is closed. At this time, the oil pressure in the upper diaphragm chamber 11 is equal to the pressure at the inlet of the oil inlet 18. Under the action of the oil pressure and the restoring force of the spring 7, the upper diaphragm assembly 4 and the lower diaphragm assembly 2 are reset, the first oil outlet channel 23 is closed, the oil filling circuit is cut off, and the pressure filling ends.

[0025] The circuits and mechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They are common knowledge.

[0026] Components not described in detail in this article are existing technologies.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A refueling control valve for an aircraft fuel tank, characterized in that: It includes a lower housing (1), a bushing (3) and an upper housing assembly (6), wherein the upper housing assembly (6), the bushing (3) and the lower housing (1) are connected sequentially from top to bottom to form an oil passage chamber with a transparent bottom; The bottom and side walls of the lower housing (1) are respectively provided with an oil inlet (18) and a first oil outlet channel (23); The oil passage chamber is provided with an upper diaphragm assembly (4) and a lower diaphragm assembly (2). The upper diaphragm assembly (4) and the lower diaphragm assembly (2) divide the oil passage chamber into an upper diaphragm chamber (11) and a lower diaphragm chamber (5). The lower diaphragm chamber (5) is connected to the float valve in the oil tank through a second oil outlet channel (16). The upper diaphragm chamber (11) is connected to the inside of the oil tank through a third oil outlet channel (19).

2. The refueling control valve for an aircraft fuel tank according to claim 1, characterized in that: An installation tube (22) is installed inside the upper housing assembly (6). The upper diaphragm assembly (4) and the lower diaphragm assembly (2) are slidably connected to the installation tube (22). A spring (7) and a gasket (8) are also provided between the upper diaphragm assembly (4) and the upper housing assembly (6). In its natural state, the lower diaphragm assembly (2) closes the first oil outlet channel (23) under the elastic force of the spring (7).

3. The refueling control valve for an aircraft fuel tank according to claim 2, characterized in that: An oil passage (20) is provided between the mounting tube (22) and the lower diaphragm assembly (2), through which oil enters the lower diaphragm cavity (5); an oil passage hole (21) is also provided on the side wall of the mounting tube (22), which corresponds to the position of the upper diaphragm cavity (11), through which oil enters the upper diaphragm cavity (11).

4. The refueling control valve for an aircraft fuel tank according to claim 1, characterized in that: The second oil outlet channel (16) is provided on the bushing (3) and the upper housing assembly (6), and multiple sets are provided. One set of the second oil outlet channel (16) is connected to the float valve through the pipe joint (17), and the remaining second oil outlet channels (16) are provided with safety valves (12).

5. A refueling control valve for an aircraft fuel tank according to claim 4, characterized in that: A bushing (14) and a sealing gasket (15) corresponding to the position of the second oil outlet channel (16) are also provided between the bushing (3) and the upper housing assembly (6).

6. A refueling control valve for an aircraft fuel tank according to claim 1, characterized in that: The upper housing assembly (6) is fitted with a one-way valve (10) and an exhaust solenoid valve (9) by screws. The third oil outlet channel (19) is connected to the inside of the oil tank through the one-way valve (10) and the exhaust solenoid valve (9).

7. A refueling control valve for an aircraft fuel tank according to claim 1, characterized in that: Multiple sets of connecting pins (13) for installation and positioning are also provided between the lower housing (1) and the bushing (3).

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