General airplane fuel tank sealing negative pressure detection device

Abstract

The utility model discloses a general airplane fuel tank sealing negative pressure detection device, which is used for detecting the sealing performance of a fuel tank and comprises an air filter, an air pressure regulator, a normally open solenoid valve, a normally closed solenoid valve, a pressure sensor, a time relay and an intermediate relay, the second end of the normally-open solenoid valve is connected with the air outlet end of the air filter, the third end of the normally-open solenoid valve is connected with the air outlet end of the normally-closed solenoid valve, the air inlet end of the normally-closed solenoid valve is connected with the air outlet end of the pressure sensor, and the time relay and the intermediate relay are electrically connected with the pressure sensor. According to the utility model, manual closure is replaced by automatic closure of the electromagnetic valve, closure is more accurate, automatic integrated design is adopted, use is simple and convenient, operation steps are shortened, operation time is saved, and the device can be used for detection of an aircraft fuel tank and detection of the sealing state of all sealed containers.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank sealing detection, in particular to a general aircraft oil tank sealing negative pressure detection device. Background Art

[0002] A fuel tank is a container for fuel on an airplane or a car. It is a special container for storing hydraulic oil or hydraulic fluid in a hydraulic system. Fuel tanks can be divided into open tanks and closed tanks. The fuel tank must have a large enough capacity.

[0003] During the oil tank sealing test, the existing oil tank pressure maintenance method is to directly connect the pressure gauge to the oil tank, which requires manual control of the pressure and time, which is inconvenient and time-consuming. Utility Model Content

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0005] A general aircraft fuel tank sealing negative pressure detection device is used to detect the sealing of the fuel tank, comprising an air filter, an air pressure regulator, a normally open solenoid valve, a normally closed solenoid valve, a pressure sensor, a time relay and an intermediate relay, wherein the air inlet end of the air pressure regulator is connected to the first end of the normally open solenoid valve, the second end of the normally open solenoid valve is connected to the air outlet end of the air filter, the third end of the normally open solenoid valve is connected to the air outlet end of the normally closed solenoid valve, the air inlet end of the normally closed solenoid valve is connected to the air outlet end of the pressure sensor, and the pressure sensor, the normally closed solenoid valve, the time relay and the intermediate relay are electrically connected to each other.

[0006] As a further solution of the utility model: it also includes an air flow control valve, and the air flow control valve is connected to the air outlet end of the air pressure regulator.

[0007] As a further solution of the utility model: it also includes a box body, and an air filter, an air flow control valve, an air pressure regulator, a normally open solenoid valve, a normally closed solenoid valve, a pressure sensor, a time relay and an intermediate relay are all arranged in the box body.

[0008] As a further solution of the utility model: a heat dissipation hole is further opened on the front side of the box body, and a heat dissipation fan is installed in the box body at a position corresponding to the heat dissipation hole.

[0009] As a further solution of the utility model: it also includes a switching power supply, a control switch and an indicator light, the switching power supply, the control switch and the indicator light are all arranged in a box, the pressure sensor, the normally open solenoid valve, the intermediate relay and the control switch are electrically connected to each other, the cooling fan, the control switch, the intermediate relay and the switching power supply are electrically connected to each other, and the indicator light is electrically connected to the time relay.

[0010] As a further solution of the utility model: hollow parts are provided on the surface of the box body at positions corresponding to the pressure sensor, the indicator light, the control switch, the air pressure regulator, the time relay, and the air flow control valve.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model replaces manual cutoff with automatic cutoff by setting an electromagnetic valve, so the cutoff is more accurate, and adopts an automatic integrated design, which is easy to use, shortens the operation steps, and saves operation time. The utility model can not only be used for the detection of aircraft fuel tanks, but also can detect the sealing status of all sealed containers.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the box structure of the utility model.

[0016] Figure 3 It is another structural schematic diagram of the box body of the utility model.

[0017] Figure 4 It is a schematic diagram of the internal structure of the box body of the utility model.

[0018] Figure 5 It is another structural schematic diagram of the interior of the box of the utility model.

[0019] In the figure: 1. air filter, 2. air pressure regulator, 3. normally open solenoid valve, 4. normally closed solenoid valve, 5. pressure sensor, 6. time relay, 7. intermediate relay, 8. box, 9. heat dissipation holes, 10. cooling fan, 11. switching power supply, 12. control switch, 13. indicator light, 14. air flow control valve, 15. hollow part. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 5 In an embodiment of the utility model, a general aircraft fuel tank sealing negative pressure detection device is used to detect the sealing of the fuel tank, including an air filter 1, an air pressure regulator 2, a normally open solenoid valve 3, a normally closed solenoid valve 4, a pressure sensor 5, a time relay 6 and an intermediate relay 7. The air inlet end of the air pressure regulator 2 is connected to the first end of the normally open solenoid valve 3, the second end of the normally open solenoid valve 3 is connected to the air outlet end of the air filter 1, the third end of the normally open solenoid valve 3 is connected to the air outlet end of the normally closed solenoid valve 4, the air inlet end of the normally closed solenoid valve 4 is connected to the air outlet end of the pressure sensor 5, the pressure sensor 5, the normally closed solenoid valve 4, the time relay 6 and the intermediate relay 7 are connected. They are electrically connected to each other. When the detection device is in operation, the air outlet of the air pressure regulator 2 is connected to the vacuum pump, and the air inlet of the pressure sensor 5 is connected to the oil tank. The vacuum pump is used to suck the air in the oil tank to obtain a vacuum environment. The air filter 1 is used to filter and purify the air. The air pressure regulator 2 is used to adjust the size of the vacuum pressure and stabilize the output. The normally open solenoid valve 3 is a three-way valve used to cut off the vacuum and release the vacuum inside the oil tank. The normally closed solenoid valve 4 is used to execute the cut-off command issued by the pressure sensor 5. The pressure sensor 5 is used to issue a cut-off command and a pressure-maintaining timing command. The time relay 6 is used to execute the timing command issued by the pressure sensor 5, and the intermediate relay 7 is used to lock the command.

[0022] The detection device also includes an air flow control valve 14, which is connected to the air outlet of the air pressure regulator 2. During operation, the air pressure regulator 2 is connected to the vacuum pump through the air flow control valve 15, and the air flow control valve 14 is used to adjust the air flow.

[0023] The detection device also includes a box 8, in which an air filter 1, an air flow control valve 14, an air pressure regulator 2, a normally open solenoid valve 3, a normally closed solenoid valve 4, a pressure sensor 5, a time relay 6 and an intermediate relay 7 are all arranged. The box 8 serves as the external shell of the detection device and provides installation space for various components. In this way, an integrated design is adopted, the component structure is clear and neat, all functional components are centrally installed, which is easy to move, and has a small size and saves space.

[0024] A heat dissipation hole 9 is also provided on the front of the box body 8, and a heat dissipation fan 10 is installed at a position corresponding to the heat dissipation hole 9 in the box body 8. When in operation, the heat dissipation fan 10 can draw air into the box body 8 to dissipate heat.

[0025] The detection device also includes a switching power supply 11, a control switch 12 and an indicator light 13. The switching power supply 11, the control switch 12 and the indicator light 13 are all arranged in a box body 8. The pressure sensor 5, the normally open solenoid valve 3, the intermediate relay 7 and the control switch 12 are electrically connected to each other. The cooling fan 10, the control switch 12, the intermediate relay 7 and the switching power supply 11 are electrically connected to each other. The indicator light 13 is electrically connected to the time relay 6. The switching power supply 11 is used to power the components, the control switch 12 is used to control the opening and closing of the components, and the indicator light 13 is used to indicate the working status of the components.

[0026] The surface of the box body 8 is provided with hollow portions 15 at positions corresponding to the pressure sensor 5, the indicator light 13, the control switch 12, the air pressure regulator 2, the time relay 6, and the air flow control valve 14, so that the pressure sensor 5, the indicator light 13, the control switch 12, the air pressure regulator 2, the time relay 6, and the air flow control valve 14 are exposed, making it convenient for staff to observe and operate.

[0027] The working principle of the utility model is: when the pressure of the air pressure regulator 2 is properly adjusted, and the air inlet end of the pressure sensor 5 is fully connected to the aircraft fuel tank. Press the control switch 12, the normally open solenoid valve 3 opens, and the air inside the fuel tank is smoothly pumped out by the vacuum pump. When the pressure sensor 5 senses that the internal pressure of the fuel tank reaches a predetermined value, it immediately sends a signal command to the intermediate relay 7, and the intermediate relay 7 immediately locks this signal command. At the same time, the normally closed solenoid valve 4 and the time relay 6 also receive this signal command. The normally closed solenoid valve 4 immediately executes the command to cut off the negative pressure air, and the time relay 6 also executes the pressure maintenance timing command at the same time. By observing the change in the pressure value of the pressure sensor 5, the sealing condition of the fuel tank can be known. When the pressure maintenance is completed, press the control switch 12, all the actuators and command elements are reset, and the negative pressure air inside the fuel tank enters the air filter 1, and then flows into the interior of the fuel tank through the normally open solenoid valve 3. The entire negative pressure detection is completed.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A general aircraft fuel tank sealing negative pressure detection device, used to detect the sealing of the fuel tank, characterized in that: It includes an air filter, an air pressure regulator, a normally open solenoid valve, a normally closed solenoid valve, a pressure sensor, a time relay and an intermediate relay. The air inlet end of the air pressure regulator is connected to the first end of the normally open solenoid valve, the second end of the normally open solenoid valve is connected to the air outlet end of the air filter, the third end of the normally open solenoid valve is connected to the air outlet end of the normally closed solenoid valve, the air inlet end of the normally closed solenoid valve is connected to the air outlet end of the pressure sensor, and the pressure sensor, the normally closed solenoid valve, the time relay and the intermediate relay are electrically connected to each other.

2. A general aircraft fuel tank sealing negative pressure detection device according to claim 1, characterized in that: It also includes an air flow control valve, which is connected to the air outlet end of the air pressure regulator.

3. A general aircraft fuel tank sealing negative pressure detection device according to claim 2, characterized in that: The utility model also comprises a box body, in which an air filter, an air flow control valve, an air pressure regulator, a normally open solenoid valve, a normally closed solenoid valve, a pressure sensor, a time relay and an intermediate relay are all arranged.

4. A general aircraft fuel tank sealing negative pressure detection device according to claim 2, characterized in that: The front of the box is also provided with heat dissipation holes, and a heat dissipation fan is installed at a position corresponding to the heat dissipation holes in the box.

5. A general aircraft fuel tank sealing negative pressure detection device according to claim 4, characterized in that: It also includes a switching power supply, a control switch and an indicator light. The switching power supply, the control switch and the indicator light are all arranged in a box. The pressure sensor, the normally open solenoid valve, the intermediate relay and the control switch are electrically connected to each other. The cooling fan, the control switch, the intermediate relay and the switching power supply are electrically connected to each other. The indicator light is electrically connected to the time relay.

6. A general aircraft fuel tank sealing negative pressure detection device according to claim 5, characterized in that: The surface of the box body is provided with hollow parts at positions corresponding to the pressure sensor, the indicator light, the control switch, the air pressure regulator, the time relay and the air flow control valve.

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