Fuel oil system of airtight test bench

Abstract

The utility model discloses a fuel oil system of an airtight test bench, which relates to the technical field of airtight tests and comprises a test bench body, an airtight detection system is arranged in the test bench body and comprises a pressure reduction loop and a detection loop, and the output end of the pressure reduction loop is connected with the input end of the detection loop. A high-pressure reducing valve and an electric proportional reducing valve are sequentially arranged on the pressure reducing loop in the airflow direction, an electromagnetic shut-off valve and a pressure sensor are sequentially arranged on the detection loop in the airflow direction, an air source input port and an air source output port are formed in a panel of the test bed body, and the input end of the pressure reducing loop is connected with the air source input port. The air source input port is used for being connected with external air supply equipment, the output end of the detection loop is connected with the output port, automatic control is achieved through a pneumatic control system, human intervention of experiment results can be reduced, the true reliability of experiment data is guaranteed, data of the test bed can be stored, and it is guaranteed that the experiment data cannot be lost.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness testing, in particular to a fuel system of an air tightness testing bench. Background Art

[0002] Most existing fuel system air tightness test benches use pressure gauges for testing. The pressure gauge readings are used without the data recording function, which results in considerable errors. When conducting testing experiments, the test is complicated, tedious, time-consuming and labor-intensive. Operators are also required to use other timing tools to keep time, read relevant data and take handwritten notes, resulting in low work efficiency, large errors and inconvenient operation. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fuel system for an airtight test bench to solve the deficiencies of the prior art.

[0004] The purpose of the utility model is achieved through the following technical solutions: a fuel system of an airtight test bench, comprising a test bench body, an airtightness detection system provided in the test bench body, the airtightness detection system comprising a decompression circuit and a detection circuit, the output end of the decompression circuit being connected to the input end of the detection circuit, a high-pressure reducing valve and an electric proportional reducing valve being sequentially provided on the decompression circuit along the airflow direction, an electromagnetic shut-off valve and a pressure sensor being sequentially provided on the detection circuit along the airflow direction, an air source input port and an output port being provided on the panel of the test bench body, the input end of the decompression circuit being connected to the air source input port, the air source input port being used to connect to an external air supply device, and the output end of the detection circuit being connected to the output port.

[0005] Furthermore, a filter is provided on the decompression circuit, and the filter is located between the gas source input port and the high-pressure decompression valve.

[0006] Furthermore, a relief valve is provided on the pressure reducing circuit, and the relief valve is located between the high-pressure pressure reducing valve and the electric proportional pressure reducing valve.

[0007] Furthermore, a pressure relief valve is provided on the pressure reducing circuit, and a pressure relief port is provided at the outlet of the pressure relief valve.

[0008] Furthermore, a power switch and a display screen are also provided on the panel of the test bench body.

[0009] Furthermore, the side walls of the test bench body are provided with pull rods, and the bottom of the test bench body is provided with bottom wheels.

[0010] The beneficial effects of the utility model are:

[0011] Automatic control is achieved through the pneumatic control system, which can reduce human intervention in the experimental results and ensure the authenticity and reliability of the experimental data. The test bench data can be stored to ensure that the experimental data will not be lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a PLC control system for a fuel system of an airtight test bench of the present utility model;

[0013] Figure 2 This is a schematic structural diagram of a fuel system of an airtight test bench of the present utility model;

[0014] In the figure, 1- bottom wheel, 2- air source input port, 3- test bench body, 4- power switch, 5- display screen, 6- output port, 7- panel, 8- pull rod, 9- high pressure reducing valve, 10- electric proportional reducing valve, 11- electromagnetic shut-off valve, 12- pressure sensor, 13- filter, 14- overflow valve, 15- pressure relief valve, 16- pressure relief port. DETAILED DESCRIPTION

[0015] Example 1

[0016] like Figure 1 and Figure 2As shown, a fuel system of an airtight test bench includes a test bench body 3, an airtightness detection system is provided in the test bench body 3, the airtightness detection system includes a decompression circuit and a detection circuit, the output end of the decompression circuit is connected to the input end of the detection circuit, a high-pressure pressure reducing valve 9 and an electric proportional pressure reducing valve 10 are sequentially provided on the decompression circuit along the airflow direction, a relief valve 14 is provided on the decompression circuit, the relief valve 14 is located between the high-pressure pressure reducing valve 9 and the electric proportional pressure reducing valve 10, an electromagnetic shut-off valve 11 and a pressure sensor 12 are sequentially provided on the detection circuit along the airflow direction, the test bench body 3 includes a test bench body 3, an airtightness detection system ... The panel 7 of the test bench 3 is provided with an air source input port 2 and an output port 6. The input end of the pressure reducing circuit is connected to the air source input port 2, and the air source input port 2 is used to connect to an external air supply device. The output end of the detection circuit is connected to the output port 6. The panel 7 of the test bench 3 is also provided with a power switch 4 and a display screen 5. The airtightness test bench is used to perform airtightness testing on the aircraft fuel system during aircraft overhaul or maintenance, and to adjust the experimental parameters during performance testing. The test bench PLC collects the pressure data of the airtight system and displays the pressure-time curve on the display screen. The display screen can display Working status and fault alarm information; specifically, an external gas source (industrial nitrogen cylinder) is connected to the gas source input port 2. The gas source pressure is 15MPa. The gas source enters the pressure reduction circuit and undergoes the first high-pressure reduction through the high-pressure reducing valve 9, reducing the pressure to 0.8MPa. The excess pressure generated by the system will overflow the system through the relief valve 14 and release the nitrogen through the hose. The nitrogen after being reduced by the high-pressure reducing valve 9 is reduced again by the electric proportional reducing valve 10 controlled by the PLC. After the reduction, the appropriate test pressure is obtained. The test pressure enters the detection circuit. To better perform the air tightness test, a pressure sensor 12 is installed in the detection circuit. The test port of the system under test is connected to the output port 6. The pressure sensor 12 and the system under test form a new closed system. The nitrogen after the second pressure reduction passes through the pressure sensor 12 and transmits the real-time pressure in this new closed system to the PLC via an electrical signal. After being processed by the PLC, it is displayed on the display screen 5. When the displayed pressure value is the same as the test pressure value, the electromagnetic shut-off valve 11 is manually closed. The change in the pressure curve on the display screen can be observed to determine the air tightness of the test part. The use of PLC control automation to achieve sealing detection can adjust the pressure of the input gas source to match the pressure requirements of the air tightness detection. The measurement data is more accurate, safer and more reliable. The pressure sensor 12 can reflect the test data in real time and store the data for direct retrieval when needed.

[0017] Example 2

[0018] Based on the first embodiment, Figure 1 As shown, a filter 13 is provided on the decompression circuit. The filter 13 is located between the gas source input port 2 and the high-pressure reducing valve 9. The filter 13 removes moisture and impurities that may be contained in the gas, thereby improving the quality of the gas source without affecting the accuracy of the test data.

[0019] Example 3

[0020] Based on the second embodiment, Figure 1 As shown, a pressure relief valve 15 is provided on the pressure reducing circuit, and a pressure relief port 16 is provided at the outlet of the pressure relief valve 15 . The excess pressure of the second pressure reduction is discharged from the system through the pressure relief port 16 of the pressure relief valve 15 .

[0021] Example 4

[0022] Based on the third embodiment, Figure 2 As shown, the side walls of the test bench body 3 are provided with a pull rod 8, and the bottom of the test bench body 3 is provided with a bottom wheel 1. The test bench body 3 adopts a Pelican trolley case, which is sturdy and durable, suitable for various bumpy, complex and harsh environments. It is waterproof, shockproof, dustproof, drop-resistant, impact-resistant, corrosion-resistant and high-temperature resistant. It contains two bottom wheels 1 and a retractable pull rod 8, and the test bench body 3 can be dragged with one hand; the panel is mounted with a 7-inch display screen PLC control, which is intuitive, easy to operate and maintain, and can more intuitively observe the air tightness of the aircraft fuel system.

Claims

1. A fuel system of an airtight test bench, comprising a test bench body (3), characterized in that: An air tightness detection system is provided in the test bench body (3), and the air tightness detection system includes a pressure reducing circuit and a detection circuit. The output end of the pressure reducing circuit is connected to the input end of the detection circuit. A high-pressure pressure reducing valve (9) and an electric proportional pressure reducing valve (10) are sequentially provided on the pressure reducing circuit along the airflow direction. An electromagnetic shut-off valve (11) and a pressure sensor (12) are sequentially provided on the detection circuit along the airflow direction. An air source input port (2) and an output port (6) are provided on the panel (7) of the test bench body (3). The input end of the pressure reducing circuit is connected to the air source input port (2), and the air source input port (2) is used to connect to an external air supply device. The output end of the detection circuit is connected to the output port (6).

2. The fuel system of the airtight test bench according to claim 1, characterized in that: A filter (13) is provided on the decompression circuit, and the filter (13) is located between the gas source input port (2) and the high-pressure decompression valve (9).

3. The fuel system of the airtight test bench according to claim 1, characterized in that: The pressure reducing circuit is provided with a relief valve (14), and the relief valve (14) is located between the high-pressure pressure reducing valve (9) and the electric proportional pressure reducing valve (10).

4. The fuel system of the airtight test bench according to claim 1, characterized in that: A pressure relief valve (15) is provided on the pressure reducing circuit, and a pressure relief port (16) is provided at the outlet of the pressure relief valve (15).

5. The fuel system of the airtight test bench according to claim 1, characterized in that: A power switch (4) and a display screen (5) are also provided on the panel (7) of the test bench body (3).

6. The fuel system of the airtight test bench according to claim 5, characterized in that: A pull rod (8) is provided on the side wall of the test bench body (3), and a bottom wheel (1) is provided on the bottom of the test bench body (3).

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