Oil level annunciator and fuel oil mechanism

Abstract

The invention provides an oil level annunciator and a fuel oil mechanism, the oil level annunciator comprises a junction box and a variable-diameter coaxial metal aluminum pipe fitting, the variable-diameter coaxial metal aluminum pipe fitting comprises an inner pipe, the center point of the inner pipe is taken as a reference, an outer pipe is nested on the periphery of the inner pipe, a middle signal pipe is nested on the periphery of the outer pipe, and the outer signal pipe is nested on the periphery of the middle signal pipe; the variable-diameter coaxial metal aluminum pipe fitting formed by combining and nesting four pipe bodies is formed; a cable in the junction box is connected with the inner tube and the middle signal tube to form an excitation end; the other cable is connected with the outer tube and the outer signal tube to form a feedback end; the outer signal pipe and the middle signal pipe are reducer pipes. The device is free of movable parts, high in reliability, light in weight, good in safety, free of electronic components and free of power supply.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation technology fuel system design, and in particular relates to an oil level signaler and a fuel mechanism. Background Art

[0002] At present, the most widely used and technologically mature oil level signal is mainly the float reed switch type signal, which adopts the reed switch magnetic float principle: the float assembly with magnet moves along the guide rod axially with the change of liquid level. When the liquid level drops to the set position, under the action of the magnetic field, the reed of the reed switch is attracted, the circuit is turned on, and the output signal is output; when the liquid level continues to drop, the reed switch remains connected under the action of the block and continues to output signals.

[0003] Since the float reed switch type signal device uses a float moving part inside, there is a risk of float jamming and adhesion, and the number of times the reed switch is connected has a life requirement, so there are strict requirements on the service life and its life requirement is relatively high. Summary of the invention

[0004] In order to solve the technical problems of float reed switch oil level signal in related technologies, such as float moving parts, float stuck, adhesion risk, and high life requirements, the present invention provides a capacitive oil level signal. The present invention has no moving parts, high reliability, light weight, good safety, and does not contain electronic components and does not require power supply. The technical solution is as follows:

[0005] In the first aspect, an oil level signal device is provided, comprising: a junction box 1 and a variable diameter coaxial metal aluminum pipe fitting, the variable diameter coaxial metal aluminum pipe fitting comprising an inner pipe 7, with the center point of the inner pipe 7 as a reference, an outer pipe 6 is nested in the outer periphery of the inner pipe 7, a middle signal pipe 5 is nested in the outer periphery of the outer pipe 6, and an outer signal pipe 4 is nested in the outer periphery of the middle signal pipe 5, forming a variable diameter coaxial metal aluminum pipe fitting with four pipe bodies combined and nested; a cable in the junction box 1 is connected to the inner pipe 7 and the middle signal pipe 5 to form an excitation end; another cable is connected to the outer pipe 6 and the outer signal pipe 4 to form a feedback end; the outer signal pipe 4 and the middle signal pipe 5 are variable diameter pipes.

[0006] In one feasible method, when the fuel level in the fuel tank changes, when the height of the fuel medium filled in the variable diameter coaxial metal aluminum tube rises or falls from the bottom of the variable diameter coaxial metal aluminum tube of the oil level signal device to the variable diameter part, the capacitance of the oil level signal device undergoes a sudden change, and the capacitance value will have a large change. The junction box 1 transmits the collected capacitance value to the onboard fuel data acquisition processor for data conversion processing to obtain the corresponding fuel quantity value.

[0007] Furthermore, the oil level signaler also includes: a movable clamp 2 and a fixed clamp 3. After the installation reference of the oil level signaler is determined, the oil level signaler is fixed to the tank wall panel through the movable clamp 2 and the fixed clamp 3 according to the reachable range of the installation position. The position of the movable clamp 2 is adjustable to achieve a stable connection at different wall panel heights.

[0008] Furthermore, the oil level signaler also includes: a protective sleeve 8 located outside the outer signal tube 4, the protective sleeve has the function of protecting the variable diameter coaxial metal aluminum pipe consisting of the outer signal tube 4, the middle signal tube 5, the outer tube 6, and the inner tube 7 from being damaged by bumps / oil stains.

[0009] Among them, the on-board fuel data acquisition processor is used to compare the obtained fuel quantity value with the preset threshold. When the fuel quantity value is equal to the preset threshold, an alarm signal is sent to the engine indication and aircrew warning system.

[0010] Optionally, the protective cover 8 is made of metal.

[0011] The inner diameter of the inner tube 7 is 12 mm, and the inner diameter of the outer tube 6 is 18 mm.

[0012] Among them, the inner diameter of the middle signal tube 5 is 21 mm, and the inner diameter of the outer signal tube 4 is 25 mm.

[0013] In a second aspect, a fuel mechanism is provided, comprising the oil level signaler as described in any one of the first aspects.

[0014] The beneficial effects of the present invention are at least:

[0015] The present invention discloses a capacitive oil level signal device, which adopts the capacitive measurement principle, converts the corresponding capacitance into a switch signal through the height information of the signal device immersed in the oil surface and sends it to an on-board data acquisition processor. The signal device has a small weight, does not contain electronic components, does not require power supply, has no moving parts, is not a life-limited part, and has a simple system structure, high reliability, and good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An appearance diagram of an oil level signal device provided by an embodiment of the present invention;

[0017] Figure 2 A structural diagram of an oil level signal device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present application is further described in detail below through specific implementation methods and drawings.

[0019] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a capacitive oil level signal device, including a junction box and a variable diameter coaxial metal aluminum pipe.

[0020] The variable diameter coaxial metal aluminum pipe fitting comprises an outer signal pipe 4 , a middle signal pipe 5 , an outer pipe 6 , and an inner pipe 7 .

[0021] With the center point of the inner tube 7 as the reference, the outer tube 6 is nested in the outer periphery of the inner tube 7, the middle signal tube 5 is nested in the outer periphery of the outer tube 6, and the outer signal tube 4 is nested in the outer periphery of the middle signal tube 5, forming a four-tube combined nested coaxial metal aluminum pipe fitting with a variable diameter.

[0022] The working principle of the present invention is as follows:

[0023] When the fuel level in the fuel tank changes, the height of the fuel medium filled in the variable diameter coaxial metal aluminum pipe rises / drops from the bottom of the variable diameter coaxial metal aluminum pipe of the oil level signal device to the variable diameter part. At this time, the capacitance of the oil level signal device undergoes a sudden change, and the capacitance value will have a large change. One of the cables in the junction box is connected to the inner tube and the middle signal to form the excitation end (positive electrode), and the other is connected to the outer tube and the outer signal tube to form the feedback end (negative electrode). The junction box transmits the collected capacitance value to the on-board fuel data acquisition processor through a signal transmission line composed of two cables for data conversion processing to obtain the corresponding oil level information, that is, the fuel value. The on-board fuel data acquisition processor compares the obtained fuel value with the preset threshold. When the fuel value is equal to the preset threshold, it sends an alarm signal to the engine indication and aircrew warning system.

[0024] In the present invention, the oil level signaler is fixed on the wall of the fuel tank at a corresponding characteristic oil level position by means of an installation bracket. When fuel is injected into the fuel tank, the oil level signaler senses the oil level height by means of the capacitance change of the signaler immersed in the fuel. The capacitance of the oil level signaler is proportional to the oil immersion height. When the oil level signaler is immersed in the fuel and reaches the characteristic oil level position, the oil level signaler sends out a set oil level capacitance signal, and the onboard fuel data acquisition processor converts and judges the specific capacitance signal.

[0025] like Figure 2 As shown, an embodiment of the present invention further provides a capacitive oil level signal device, including: a junction box 1, a movable clamp 2, a fixed clamp 3, an outer signal tube 4, a middle signal tube 5, an outer tube 6, an inner tube 7, and a protective cover 8.

[0026] With the center point of the inner tube 7 as the reference, the outer tube 6 is nested in the outer periphery of the inner tube 7, the middle signal tube 5 is nested in the outer periphery of the outer tube 6, and the outer signal tube 4 is nested in the outer periphery of the middle signal tube 5, forming a four-tube combined nested coaxial metal aluminum pipe fitting with a variable diameter.

[0027] The outer surface of the reducer aluminum metal pipe is covered with 8 protective sleeves to protect the coaxial aluminum metal pipe from being damaged by collision, friction, pollution, etc.

[0028] A junction box is provided on the top of the variable diameter coaxial metal aluminum tube. There are two signal transmission cables inside the junction box 1. One is connected to the inner tube 7 and the middle signal 5 to form the positive pole of the excitation end, and the other is connected to the outer tube 6 and the outer signal tube 4 to form the negative pole of the feedback end, which is used to send the collected capacitance value to the fuel data concentrator for data processing. Finally, a movable clamp 2 and a fixed clamp 3 are provided on the main part of the oil level signal device to install and fix the oil level signal device.

[0029] The function of the movable clamp 2 is to fix the oil level signal device on the oil tank wall panel according to the reachable range of the installation position after the installation reference of the oil controller is determined; the function of the fixed clamp 3 is to determine the positioning reference of the oil level signal device on the oil tank wall panel; the function of the protective sleeve 8 is to protect the coaxial metal aluminum tube composed of the outer signal tube 4, the middle signal tube 5, the outer tube 6, and the inner tube 7 from being damaged by bumps / oil stains.

[0030] The working principle of the embodiment of the present invention is:

[0031] The oil level signaler is fixedly installed at a specific position in the fuel tank by means of a movable clamp and a fixed clamp. When the fuel level in the fuel tank changes, the height of the fuel medium filled in the variable diameter coaxial metal aluminum pipe fitting rises or falls from the bottom of the variable diameter coaxial metal aluminum pipe fitting of the oil level signaler to the variable diameter part. At this time, the capacitance of the oil level signaler undergoes a sudden change, and the capacitance value will have a large change. The junction box transmits the collected capacitance value to the onboard fuel data acquisition processor for data conversion processing to obtain the corresponding oil quantity value.

[0032] The oil level signaler adopts the capacitive measurement principle. The main part of the oil level signaler is composed of a variable diameter coaxial metal aluminum pipe fitting, which is composed of an outer signal tube, a middle signal tube, an outer tube and an inner tube. Two cables in the junction box set in the main part of the oil level signaler are respectively connected to the outer signal tube, the outer tube and the inner signal tube, and the inner tube is used as the two poles of the signal transmission cable of the oil level signaler. The oil level signaler is installed at a specific position in the fuel tank. When the fuel liquid level in the fuel tank reaches the set oil level, the oil level signaler transmits the capacitance value corresponding to the oil level to the on-board fuel data acquisition processor through the signal transmission cable inside the junction box. The on-board fuel data acquisition processor converts the received capacitance value into a switch signal (fuel value), and then compares and judges the switch signal with the preset threshold value. When the switch signal is equal to the preset threshold, the on-board fuel data acquisition processor sends an alarm signal to the engine indication and aircrew warning system.

[0033] The above only expresses the implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. In addition, the parts that are not detailed in this application are all conventional technologies.

Claims

1. An oil level signal device, characterized in that: include: The junction box (1) and the variable diameter coaxial metal aluminum pipe fitting include an inner pipe (7), with the center point of the inner pipe (7) as a reference, an outer pipe (6) is nested on the periphery of the inner pipe (7), a middle signal pipe (5) is nested on the periphery of the outer pipe (6), and an outer signal pipe (4) is nested on the periphery of the middle signal pipe (5), forming a variable diameter coaxial metal aluminum pipe fitting with four pipe bodies combined and nested; a cable in the junction box (1) is connected to the inner pipe (7) and the middle signal pipe (5) to form an excitation end; another cable is connected to the outer pipe (6) and the outer signal pipe (4) to form a feedback end; the outer signal pipe (4) and the middle signal pipe (5) are variable diameter pipes.

2. The oil level signal device according to claim 1, characterized in that: When the fuel level in the fuel tank changes, the height of the fuel medium filled in the variable diameter coaxial metal aluminum pipe rises or falls from the bottom of the variable diameter coaxial metal aluminum pipe of the oil level signal device to the variable diameter part, and the capacitance of the oil level signal device undergoes a sudden change, and the capacitance value will have a large change. The junction box (1) transmits the collected capacitance value to the onboard fuel data collection processor for data conversion processing to obtain the corresponding fuel quantity value.

3. The oil level signal device according to claim 1, characterized in that: The oil level signaler also includes: a movable clamp (2) and a fixed clamp (3). After the installation reference of the oil level signaler is determined, the oil level signaler is fixed to the oil tank wall plate through the movable clamp (2) and the fixed clamp (3) according to the reachable range of the installation position. The position of the movable clamp (2) is adjustable.

4. The oil level signal device according to claim 1, characterized in that: The oil level signal device also includes a protective sleeve (8) located outside the outer signal tube (4).

5. The oil level signal device according to claim 1, characterized in that: The onboard fuel data acquisition processor is used to compare the obtained fuel quantity value with the preset threshold. When the fuel quantity value is equal to the preset threshold, an alarm signal is sent to the engine indication and aircrew warning system.

6. The oil level signal device according to claim 4, characterized in that: The protective cover (8) is made of metal.

7. The oil level signal device according to claim 1, characterized in that: The inner diameter of the inner tube (7) is 12 mm, and the inner diameter of the outer tube (6) is 18 mm.

8. The oil level signal device according to claim 2, characterized in that: The inner diameter of the middle signal tube (5) is 21 mm, and the inner diameter of the outer signal tube (4) is 25 mm.

9. A fuel mechanism, characterized in that: Including the oil level signal device according to any one of claims 1 to 8.

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