A micro-pressure filling safety protection device for a basic trainer aircraft fuel tank

Abstract

This invention relates to the field of low-pressure fuel tank technology, specifically a safety protection device for low-pressure fuel tank charging of a basic trainer aircraft. The device includes a fuel tank body with an air inlet at the top and an air inlet pipe fixedly connected inside. When the fuel tank body is charged via the air inlet pipe, if the pressure inside the fuel tank body exceeds the pressure inside the fixed pipe, gas enters the fixed pipe and compresses a first piston, causing it to open a pressure relief pipe. Gas then releases pressure through the pressure relief pipe, which in turn drives a rotating fan blade. This rotating fan blade drives a rotating shaft, which in turn drives a rotating valve via two bevel gears, causing it to rotate and close. The rotating valve then drives a limit block, causing the limit block to rotate at the other end of the notch ring. This achieves automatic valve closure and timely cessation of fuel tank charging during automatic pressure relief.

Description

Technical Field

[0001] This invention relates to the field of fuel tank micro-pressure technology, specifically a basic trainer aircraft fuel tank micro-pressure charging safety protection device. Background Technology

[0002] Basic trainer aircraft have limited flight altitudes, and the pressure and impact pressure of the liquid in the fuel tanks built into the wings are very low. However, this pressure must be simulated during static testing of the aircraft. Different aircraft and different operating conditions have different pressures. When conducting force loading tests on the aircraft, the fuel tanks are pressurized to simulate the pressurization, and protection is needed for the simulated pressurization.

[0003] A search of the invention patent with publication number CN 112660418 B reveals a safety protection device for low-pressure charging of a small aircraft fuel tank, including a safety protection setting for the charging air path and a safety protection setting for the pressure measuring air path. The safety setting for the charging air path includes: a small air tank, a rupture membrane assembly, a charging air path pressure sensor, and a charging air path reversing valve. The safety setting for the pressure measuring air path includes: a fuel tank pressure sensor, a pressure measuring air path reversing valve, a manual bypass switch, and a hose-type low-pressure safety air path subsystem.

[0004] Based on the above search results and existing technologies, the following findings were made:

[0005] In the existing basic trainer aircraft's low-pressure fuel tank pressurization process, most of them use automatic depressurization to protect the fuel tank from pressurization. However, it is still necessary to manually close the pressurization valve. During the period from the detection of depressurization to the manual closure of the pressurization valve, the fuel tank is still being pressurized, which means that the pressurization valve cannot be closed in time. Summary of the Invention

[0006] The purpose of this invention is to provide a safety protection device for low-pressure charging of fuel tanks in basic trainer aircraft, so as to solve the problems mentioned in the background art.

[0007] The technical solution of this invention is: a safety protection device for low-pressure charging of a basic trainer aircraft fuel tank, comprising a fuel tank body, an air inlet hole on the top of the fuel tank body, an air inlet pipe fixedly connected to the air inlet hole, a guide pipe attached to the top of the air inlet pipe, and a rotary valve rotatably connected to the guide pipe, and further comprising:

[0008] A fixed tube is fixedly connected to the air guide tube, and a first piston and a second piston are slidably connected inside the fixed tube.

[0009] A pressure relief pipe is fixedly connected to the fixed pipe, and the pressure relief pipe is adapted to the first piston;

[0010] An automatic valve closing mechanism is located on the pressure relief pipe and is connected to the rotary valve;

[0011] A positioning adjustment mechanism is located on the fixed tube;

[0012] A fixed clamping mechanism is located on the air guide tube;

[0013] A support mechanism is located on the fixed tube;

[0014] The automatic valve closing mechanism includes two arc-shaped blocks fixedly connected to one end of the pressure relief pipe. Each of the two arc-shaped blocks has a rotating hole on one side. A rotating shaft is rotatably connected in the rotating hole. A rotating fan blade is fixedly sleeved on the rotating shaft. The rotating fan blade is adapted to the air outlet end of the pressure relief pipe. A bevel gear is keyed to both the rotating shaft and the rotating valve. The two bevel gears mesh with each other.

[0015] Preferably, the positioning adjustment mechanism includes a sliding hole formed in the inner wall of one end of the fixed tube, a push rod fixedly connected to one side of the second piston, one end of the push rod passing through the sliding hole and extending to one side of the sliding hole, a fixed frame fixedly connected to the fixed tube, an electric telescopic rod fixedly connected to the fixed frame, and the output end of the electric telescopic rod fixedly connected to one end of the push rod.

[0016] Preferably, a fixed rod is fixedly connected to the push rod, a positioning pin is slidably sleeved on the fixed rod, two positioning slots are opened on the fixed frame, one end of the positioning pin extends into one of the positioning slots, a compression spring is sleeved on the fixed rod, and the two ends of the compression spring are fixedly connected to the fixed rod and the positioning pin respectively.

[0017] Preferably, the support mechanism includes a U-shaped block fixedly connected to the fixed tube, a rotating rod rotatably connected to the U-shaped block, a groove at the bottom end of the rotating rod, a movable rod slidably connected in the groove, a suction cup fixedly connected to the bottom end of the movable rod, and the bottom of the suction cup adsorbed onto the top of the oil tank body.

[0018] Preferably, an L-shaped block is fixedly connected to one side of the rotating rod, a threaded hole is provided on one side of the L-shaped block, a bolt is screwed into the threaded hole, an installation hole is provided on the inner wall of one side of the groove, and one end of the bolt passes through the installation hole and fits against one side of the movable rod.

[0019] Preferably, the fixing clamping mechanism includes a sliding ring slidably connected to the air guide pipe, two fixing blocks fixedly connected to the sliding ring, each fixing block having a movable hole on one side, a sliding rod slidably connected in each of the two movable holes, an arc-shaped clamping block fixedly connected to one end of each of the two sliding rods that are close to each other, both of the arc-shaped clamping blocks being in contact with the air intake pipe, and a return spring sleeved on each of the two sliding rods, the two ends of the return spring being fixedly connected to the sliding rod and the fixing block respectively.

[0020] Preferably, a telescopic spring is fitted onto the air guide tube, and the two ends of the telescopic spring are fixedly connected to the air guide tube and the sliding ring, respectively.

[0021] Preferably, a notched ring is fixedly connected to the air guide pipe, and a limiting block is fixedly connected to the rotary valve, with the limiting block contacting one end of the notched ring.

[0022] Preferably, the fixed tube contains an inert gas, which is located between the first piston and the second piston.

[0023] This invention provides an improved safety protection device for low-pressure charging of fuel tanks in basic trainer aircraft, which has the following improvements and advantages compared with the prior art:

[0024] Firstly, when the present invention inflates the fuel tank body through the air duct, when the pressure inside the fuel tank body is greater than the pressure inside the fixed pipe, the gas will enter the fixed pipe and squeeze the first piston to move, causing the first piston to open the pressure relief pipe. At this time, the gas will be depressurized through the pressure relief pipe. The gas discharged from the pressure relief pipe will blow the rotating fan blade to rotate. The rotating fan blade drives the rotating shaft to rotate. The rotating shaft drives the rotating valve to rotate and close through two bevel gears. The rotating valve drives the limit block to rotate, causing the limit block to rotate the other end of the notch ring. This realizes that during the automatic depressurization of the fuel tank, the valve can be automatically closed and the fuel tank pressurization can be stopped in time.

[0025] Secondly, the present invention uses an electric telescopic rod to drive the push rod and the second piston to move. The movement of the push rod drives the fixed rod and the positioning pin to move, so that the positioning pin moves out of the current positioning slot. During the movement of the positioning pin, the compression spring will be compressed and elastically deformed until the positioning pin moves into another positioning slot. At this time, the distance between the second piston and the first piston decreases, thereby increasing the pressure in the fixed tube and realizing the pressure test under different air pressures.

[0026] Thirdly, this invention increases the distance between the two arc-shaped clamps by pulling the two sliding rods outward. Then, the bottom end of the air guide tube is placed on the top end of the air intake tube. Pulling the fixing block downward causes the sliding ring to move downward. The movement of the sliding ring causes the telescopic spring to compress and undergo elastic deformation, so that the compressed telescopic spring can fix the air guide tube. At this time, stop pulling the sliding rods outward, so that the two arc-shaped clamps are fitted on the air intake tube, which makes it easy to fix the air guide tube on the air intake tube.

[0027] Fourthly, this invention rotates the rotating rod and the movable rod to a vertical position, pulls the suction cup downward to contact the oil tank body, so that the suction cup is attached to the oil tank body, and then rotates the bolt to contact the movable rod, thereby fixing the movable rod and supporting the fixed tube, thus improving the stability of the device. Attached Figure Description

[0028] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the positioning adjustment mechanism of the present invention;

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of the first piston and the second piston of the present invention.

[0032] Figure 4 This is a three-dimensional structural diagram of the positioning adjustment mechanism of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the fixing and clamping mechanism of the present invention;

[0034] Figure 6 This is the invention Figure 2 Schematic diagram of the three-dimensional structure at point A in the middle;

[0035] Figure 7 This is a three-dimensional structural diagram of the support mechanism of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Fuel tank body; 101. Inlet pipe; 102. Air guide pipe; 103. Fixed pipe; 104. First piston; 105. Second piston; 106. Pressure relief pipe; 107. Arc-shaped block; 108. Rotating shaft; 109. Rotating fan blade; 110. Bevel gear; 111. Rotating valve; 112. Limiting block; 113. Notched ring; 2. Fixing frame; 201. Electric telescopic rod; 202. Push rod; 203. Fixed rod; 204. Compression spring; 205. Positioning pin; 206. Positioning groove; 3. Sliding ring; 301. Fixed block; 302. Sliding rod; 303. Return spring; 304. Arc-shaped clamp; 305. Telescopic spring; 4. U-shaped block; 401. Rotating rod; 402. Movable rod; 403. Suction cup; 404. L-shaped block; 405. Bolt. Detailed Implementation

[0038] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention provides an improved safety protection device for low-pressure charging of fuel tanks in basic trainer aircraft. The technical solution of this invention is as follows:

[0040] like Figures 1-7 As shown, a basic trainer aircraft fuel tank low-pressure charging safety protection device includes a fuel tank body 1, an air inlet on the top of the fuel tank body 1, an air inlet pipe 101 fixedly connected to the air inlet, an air guide pipe 102 attached to the top of the air inlet pipe 101, and a rotary valve 111 rotatably connected to the air guide pipe 102. The device also includes:

[0041] A fixed tube 103 is fixedly connected to the air guide tube 102, and a first piston 104 and a second piston 105 are slidably connected inside the fixed tube 103.

[0042] Pressure relief pipe 106 is fixedly connected to fixed pipe 103 and is adapted to first piston 104;

[0043] An automatic valve closing mechanism is located on the pressure relief pipe 106 and is connected to the rotary valve 111.

[0044] A positioning adjustment mechanism is located on the fixed tube 103;

[0045] A fixed clamping mechanism is located on the air guide tube 102;

[0046] The support mechanism is located on the fixed tube 103;

[0047] The automatic valve closing mechanism includes two arc-shaped blocks 107 fixedly connected to one end of the pressure relief pipe 106. Each of the two arc-shaped blocks 107 has a rotating hole on one side, and a rotating shaft 108 is rotatably connected in the rotating hole. A rotating fan blade 109 is fixedly sleeved on the rotating shaft 108. The rotating fan blade 109 is adapted to the air outlet end of the pressure relief pipe 106. A bevel gear 110 is keyed to both the rotating shaft 108 and the rotating valve 111, and the two bevel gears 110 mesh with each other. With the above structure, the automatic valve closing mechanism enables the valve to be automatically closed and the pressurization of the oil tank to be stopped in time during the automatic pressure relief process of the oil tank.

[0048] Furthermore, the positioning adjustment mechanism includes a sliding hole formed in the inner wall of one end of the fixed tube 103. A push rod 202 is fixedly connected to one side of the second piston 105. One end of the push rod 202 passes through the sliding hole and extends to one side of the sliding hole. A fixed frame 2 is fixedly connected to the fixed tube 103. An electric telescopic rod 201 is fixedly connected to the fixed frame 2. The output end of the electric telescopic rod 201 is fixedly connected to one end of the push rod 202. A fixed rod 203 is fixedly connected to the push rod 202. A positioning pin 2 is slidably sleeved on the fixed rod 203. 05. Two positioning slots 206 are provided on the fixed frame 2. One end of the positioning pin 205 extends into one of the positioning slots 206. A compression spring 204 is sleeved on the fixed rod 203. The two ends of the compression spring 204 are fixedly connected to the fixed rod 203 and the positioning pin 205 respectively. With the above structure, through the setting of the positioning adjustment mechanism, the electric telescopic rod 201 drives the second piston 105 to move through the push rod 202, thereby increasing the pressure inside the fixed tube 103 and realizing the pressure test under different air pressures.

[0049] Furthermore, the support mechanism includes a U-shaped block 4 fixedly connected to the fixed tube 103, a rotating rod 401 rotatably connected to the U-shaped block 4, a groove at the bottom end of the rotating rod 401, a movable rod 402 slidably connected in the groove, a suction cup 403 fixedly connected to the bottom end of the movable rod 402, the bottom of the suction cup 403 adsorbing onto the top of the oil tank body 1, an L-shaped block 404 fixedly connected to one side of the rotating rod 401, a threaded hole on one side of the L-shaped block 404, a bolt 405 screwed into the threaded hole, an installation hole on the inner wall of one side of the groove, one end of the bolt 405 passing through the installation hole and fitting against one side of the movable rod 402; with the above structure, by setting the support mechanism, the rotating rod 401 and the movable rod 402 are rotated to a vertical state, and then the suction cup 403 is adsorbed onto the oil tank body 1, thus realizing the support of the fixed tube 103.

[0050] Furthermore, the fixing and clamping mechanism includes a sliding ring 3 slidably connected to the air guide pipe 102. Two fixing blocks 301 are fixedly connected to the sliding ring 3. Each of the two fixing blocks 301 has a movable hole on one side. A sliding rod 302 is slidably connected to each of the two movable holes. An arc-shaped clamping block 304 is fixedly connected to the end of each sliding rod 302 that is close to each other. Both arc-shaped clamping blocks 304 are in contact with the air inlet pipe 101. A return spring 303 is sleeved on each of the two sliding rods 302. The two ends of the return spring 303 are fixedly connected to the sliding rod 302 and the fixing block 301, respectively. A telescopic spring 305 is sleeved on the air guide pipe 102. The two ends of the telescopic spring 305 are fixedly connected to the air guide pipe 102 and the sliding ring 3, respectively. With the above structure, the fixing and clamping mechanism supports the fixing pipe 103 and improves the stability of the device.

[0051] Furthermore, a notched ring 113 is fixedly connected to the air guide pipe 102, and a limiting block 112 is fixedly connected to the rotary valve 111. The limiting block 112 is in contact with one end of the notched ring 113. Through the above structure, the limiting block 112 cooperates with the notched ring 113 to limit the rotary valve 111, thereby facilitating the closing of the rotary valve 111.

[0052] Furthermore, an inert gas is provided inside the fixed tube 103, and the inert gas is located between the first piston 104 and the second piston 105; by means of the above structure, the pressure inside the fixed tube 103 can be better regulated by the setting of the inert gas.

[0053] Working principle: When the rotary valve 111 is manually opened and the oil tank body 1 is pressurized through the air pipe 102, when the pressure inside the oil tank body 1 is greater than the pressure inside the fixed pipe 103, the gas will enter the fixed pipe 103 and squeeze the first piston 104 to move, causing the first piston 104 to open the pressure relief pipe 106. At this time, the gas will be depressurized through the pressure relief pipe 106. The gas discharged from the pressure relief pipe 106 will blow the rotary fan blade 109 to rotate. The rotation of the rotary fan blade 109 drives the rotary shaft 108 to rotate. The rotation of the rotary shaft 108 drives the rotary valve 111 to rotate and close through the two bevel gears 110. The rotation of the rotary valve 111 drives the limit block 112 to rotate, causing the limit block 112 to rotate the other end of the notch ring 113. This realizes that during the automatic depressurization of the oil tank, the valve can be automatically closed and the pressurization of the oil tank can be stopped in time.

[0054] The electric telescopic rod 201 drives the push rod 202 and the second piston 105 to move. The movement of the push rod 202 drives the fixed rod 203 and the positioning pin 205 to move, so that the positioning pin 205 moves out of the current positioning slot 206. During the process of moving out, the positioning pin 205 will drive the compression spring 204 to compress and undergo elastic deformation until the positioning pin 205 moves into another positioning slot 206. At this time, the distance between the second piston 105 and the first piston 104 decreases, thereby increasing the pressure in the fixed tube 103 and realizing the pressure test under different air pressures.

[0055] Pull the two sliding rods 302 outward to increase the distance between the two arc-shaped clamps 304. Then place the bottom end of the air guide tube 102 on the top end of the air intake tube 101. Pull the fixing block 301 down to move the sliding ring 3 downward. The movement of the sliding ring 3 causes the telescopic spring 305 to compress and undergo elastic deformation, so that the compressed telescopic spring 305 can fix the air guide tube 102. At this time, stop pulling the sliding rods 302 outward, so that the two arc-shaped clamps 304 are fitted on the air intake tube 101, which makes it easy to fix the air guide tube 102 on the air intake tube 101.

[0056] Rotate the rotating rod 401 and the movable rod 402 to a vertical position, pull the suction cup 403 down to contact the oil tank body 1, so that the suction cup 403 is attached to the oil tank body 1. Then rotate the bolt 405 to contact the movable rod 402, thereby fixing the movable rod 402 and supporting the fixed tube 103, which improves the stability of the device.

[0057] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safety protection device for low-pressure charging of fuel tanks in basic trainer aircraft, comprising a fuel tank body (1), characterized in that: The top of the oil tank body (1) is provided with an air inlet, and an air inlet pipe (101) is fixedly connected inside the air inlet. An air guide pipe (102) is attached to the top of the air inlet pipe (101), and a rotary valve (111) is rotatably connected to the air guide pipe (102). The tank also includes: A fixed tube (103) is fixedly connected to the air guide tube (102), and a first piston (104) and a second piston (105) are slidably connected inside the fixed tube (103). Pressure relief pipe (106), the pressure relief pipe (106) is fixedly connected to the fixed pipe (103), and the pressure relief pipe (106) is adapted to the first piston (104); An automatic valve closing mechanism is located on the pressure relief pipe (106) and is connected to the rotary valve (111); A positioning adjustment mechanism is located on the fixed tube (103); A fixed clamping mechanism is located on the air guide pipe (102); A support mechanism is located on the fixed tube (103); The automatic valve closing mechanism includes two arc-shaped blocks (107) fixedly connected to one end of the pressure relief pipe (106). A rotating hole is provided on one side of each of the two arc-shaped blocks (107). A rotating shaft (108) is rotatably connected in the rotating hole. A rotating fan blade (109) is fixedly sleeved on the rotating shaft (108). The rotating fan blade (109) is adapted to the air outlet end of the pressure relief pipe (106). A bevel gear (110) is keyed to both the rotating shaft (108) and the rotating valve (111). The two bevel gears (110) mesh with each other. A notched ring (113) is fixedly connected to the air guide pipe (102), and a limiting block (112) is fixedly connected to the rotary valve (111). The limiting block (112) is in contact with one end of the notched ring (113).

2. The safety protection device for low-pressure charging of fuel tanks in a basic trainer aircraft according to claim 1, characterized in that: The positioning adjustment mechanism includes a sliding hole opened on the inner wall of one end of the fixed tube (103). A push rod (202) is fixedly connected to one side of the second piston (105). One end of the push rod (202) passes through the sliding hole and extends to one side of the sliding hole. A fixed frame (2) is fixedly connected to the fixed tube (103). An electric telescopic rod (201) is fixedly connected to the fixed frame (2). The output end of the electric telescopic rod (201) is fixedly connected to one end of the push rod (202).

3. The basic trainer aircraft fuel tank micro-pressure charging safety protection device according to claim 2, characterized in that: A fixed rod (203) is fixedly connected to the push rod (202), and a positioning pin (205) is slidably sleeved on the fixed rod (203). Two positioning slots (206) are opened on the fixed frame (2). One end of the positioning pin (205) extends into one of the positioning slots (206). A compression spring (204) is sleeved on the fixed rod (203), and both ends of the compression spring (204) are fixedly connected to the fixed rod (203) and the positioning pin (205) respectively.

4. The safety protection device for low-pressure charging of fuel tank in a basic trainer aircraft according to claim 2, characterized in that: The support mechanism includes a U-shaped block (4) fixedly connected to the fixed tube (103), a rotating rod (401) rotatably connected to the U-shaped block (4), a groove is provided at the bottom end of the rotating rod (401), a movable rod (402) is slidably connected in the groove, a suction cup (403) is fixedly connected to the bottom end of the movable rod (402), and the bottom of the suction cup (403) is adsorbed on the top of the oil tank body (1).

5. The basic trainer aircraft fuel tank micro-pressure charging safety protection device according to claim 4, characterized in that: An L-shaped block (404) is fixedly connected to one side of the rotating rod (401). A threaded hole is provided on one side of the L-shaped block (404), and a bolt (405) is screwed into the threaded hole. An installation hole is provided on the inner wall of one side of the groove, and one end of the bolt (405) passes through the installation hole and fits against one side of the movable rod (402).

6. The safety protection device for low-pressure charging of fuel tank in a basic trainer aircraft according to claim 1, characterized in that: The fixed clamping mechanism includes a sliding ring (3) slidably connected to the air guide pipe (102). Two fixed blocks (301) are fixedly connected to the sliding ring (3). Each of the two fixed blocks (301) has a movable hole on one side. A sliding rod (302) is slidably connected in each of the two movable holes. An arc-shaped clamp (304) is fixedly connected to one end of each of the two sliding rods (302) that is close to each other. Both arc-shaped clamps (304) are in contact with the air inlet pipe (101). A return spring (303) is sleeved on each of the two sliding rods (302). The two ends of the return spring (303) are fixedly connected to the sliding rod (302) and the fixed block (301) respectively.

7. The basic trainer aircraft fuel tank micro-pressure charging safety protection device according to claim 6, characterized in that: A telescopic spring (305) is sleeved on the air guide tube (102), and the two ends of the telescopic spring (305) are fixedly connected to the air guide tube (102) and the sliding ring (3), respectively.

8. The safety protection device for low-pressure charging of fuel tank in a basic trainer aircraft according to claim 1, characterized in that: The fixed tube (103) contains an inert gas, which is located between the first piston (104) and the second piston (105).

Images