Ventilation joint for ventilation of aircraft fuel tank

Abstract

The invention discloses a ventilation connector for ventilation of an aircraft fuel tank, and belongs to the technical field of aircraft fuel tank accessories, the ventilation connector comprises a connector body, and a rubber mat is arranged at the top of the connector body; a mounting mechanism; the locking mechanism comprises a storage battery, a fixed conducting strip, an alarm and two positioning plates; and the condensation mechanism comprises an air pump, a condenser and an air distribution pipe. The ventilation joint can be quickly mounted through the mounting mechanism, the mounting stability can be improved through the locking mechanism, so that the sealing performance is ensured, and the subsequent mounting looseness can be timely found and alarmed, so that the safety accident caused by leakage is avoided, and the service life of the ventilation joint is prolonged. By means of the condensation mechanism and the linkage mechanism, the temperature in the oil tank can be adjusted, fuel steam can be condensed and recycled, the condensation effect can be adjusted according to the temperature so as to keep temperature balance, and pollution caused by the fact that the fuel steam is discharged into the atmosphere is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft fuel tank accessories, in particular to a ventilation joint for ventilation of an aircraft fuel tank. Background Art

[0002] In the field of modern aviation, the safe operation of aircraft is of vital importance. As the core part of the aircraft fuel system, the design and function of the fuel tank are directly related to the safety performance of the aircraft. The ventilation joint for aircraft fuel tank ventilation is used to introduce clean air into the fuel tank during fuel tank ventilation. The air pressure inside the fuel tank will change at different flight altitudes and attitudes. The ventilation joint can ensure that the internal pressure of the fuel tank is balanced with the external environmental pressure, thereby avoiding damage to the fuel tank structure caused by excessive pressure difference.

[0003] When the current ventilation joints for aircraft fuel tank ventilation are ventilated, some fuel vapor will be discharged into the atmosphere. The emission of fuel vapor may also increase the risk of fire. In addition, the existing fan fuel tank ventilation joints cannot monitor the sealing of the installation. Once a leak occurs, it is difficult to detect it in time, which is prone to safety accidents. Therefore, we propose a ventilation joint for aircraft fuel tank ventilation to solve this problem. Summary of the invention

[0004] The object of the present invention is to provide a ventilation joint for ventilation of aircraft fuel tanks to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A ventilation joint for ventilation of an aircraft fuel tank, comprising:

[0007] A joint body, the top of which is provided with a rubber pad;

[0008] The mounting mechanism comprises a connecting screw, a pressing block and a butterfly nut, wherein the connecting screw is threadedly connected to the inside of the butterfly nut, and one end of the connecting screw is fixedly connected to a connecting head, and the connecting head is movably inserted in the pressing block, and the other end of the connecting screw is movably sleeved with a knob, and a plurality of positioning grooves are provided on the outer side of the knob;

[0009] A locking mechanism, the locking mechanism comprising a storage battery, a fixed conductive sheet, an alarm and two positioning plates, the positioning plates being movably inserted into the corresponding positioning grooves, and a positioning groove adapted to the butterfly nut is provided on one side of the positioning plate;

[0010] The condensation mechanism comprises an air pump, a condenser and an air distribution pipe. The air outlet of the air pump is connected to the air outlet pipe, the air distribution pipe is rotatably sleeved on the outside of the air outlet pipe, and a linkage mechanism is arranged at the bottom of the air distribution pipe.

[0011] Preferably, the battery and the fixed conductive sheet are both fixedly mounted at the bottom of the connector body, and the other side of the two positioning plates is fixedly connected to the same U-shaped rod, and a movable conductive sheet is fixedly mounted at the bottom of the U-shaped rod, and the movable conductive sheet is adapted to the fixed conductive sheet;

[0012] The positive pole of the battery is electrically connected to the fixed conductive sheet, and the movable conductive sheet and the negative pole of the battery are electrically connected to the two ends of the alarm respectively. After the movable conductive sheet moves horizontally, it can contact the fixed conductive sheet, and the circuit of the battery and the alarm is turned on.

[0013] Preferably, the air distribution pipe comprises a straight pipe and a plurality of curved pipes integrally formed at one end of the straight pipe, an active friction wheel is fixedly mounted on the outer side of the straight pipe, and an annular groove is provided on the outer side of the straight pipe, two limit plates are fixedly mounted on the inner wall of the joint body, and the limit plates are movably inserted in the annular groove;

[0014] The linkage mechanism includes a fixed shaft, a rotating cylinder and a plurality of pressure sensors, wherein the fixed shaft is fixedly connected to the inside of the joint body, and the rotating cylinder is rotatably sleeved on the outside of the fixed shaft, a driven friction wheel is fixedly sleeved on the outside of the rotating cylinder, and the driven friction wheel is movably abutted against the active friction wheel, the other end of the fixed shaft is fixedly connected to a three-prong plate, and the pressure sensor is fixedly connected to one side of the three-prong plate;

[0015] A plurality of inclined holes are provided on the outer side of the rotating cylinder, an inclined rod is slidably installed in the inclined holes, a sliding cylinder is slidably sleeved on the outer side of the rotating cylinder, a guide rod is fixedly installed on the outer side of the slide cylinder, the inclined rod is slidably sleeved on the outer side of the guide rod, and a plurality of arc blocks are slidably installed on the outer side of the slide cylinder, the arc blocks perform circular motion along the outer edge of the slide cylinder, the arc blocks are movably abutted against the other end of the corresponding pressure sensor, and a plurality of limit rods are fixedly connected to one side of the arc block, and the limit rods are slidably connected to the inside of the tripod plate.

[0016] Preferably, two fixing plates are fixedly installed at the bottom of the joint body, both of which are slidably sleeved on the outside of the U-shaped rod, and one side of the fixing plate is fixedly connected to a connecting spring, and the other end of the connecting spring is fixedly connected to the corresponding positioning plate.

[0017] Preferably, the outer side of the knob is threadedly connected with a slotted flat-end set screw, one end of the slotted flat-end set screw movably abuts against the outer side of the connecting screw, and the outer side of the connecting screw is sleeved with a flat washer, and the flat washer is arranged between the butterfly nut and the pressure block;

[0018] The top of the pressing block is provided with a long groove, the bottom inner wall of the long groove is provided with a socket, the connecting head is movably inserted into the long groove and the socket, the top of the connecting head is integrally formed with a disc, and the disc movably abuts against the top of the pressing block.

[0019] Preferably, a temperature sensor is fixedly installed in the connector body, a controller is fixedly installed at the bottom of the connector body, the temperature sensor, pressure sensor, air pump and condenser are all connected to the control signal, when the temperature sensor detects that the temperature rises, the controller controls the power of the air pump to increase accordingly, when the pressure sensor detects that the pressure increases, the controller controls the power of the condenser to increase accordingly;

[0020] The condenser and the air pump are both fixedly mounted on the outside of the joint body, and a U-shaped tube is connected between the air outlet of the condenser and the air inlet of the air pump, the air inlet of the condenser is connected to the joint, and a condensation reflux pipe is connected to the outside of the condenser.

[0021] The beneficial effects of the present invention are:

[0022] 1. In the present invention, the ventilation joint for ventilation of an aircraft fuel tank can realize quick installation of the ventilation joint through the provided installation mechanism, and can improve the stability of the installation through the provided locking mechanism, thereby ensuring the sealing performance, and can timely detect and alarm when the installation is loose in the future, thereby avoiding safety accidents caused by leakage;

[0023] 2. In the present invention, the ventilation joint for ventilation of an aircraft fuel tank is started by starting the air pump and the condenser. The air pump draws the air in the joint body into the condenser, and then the air is discharged back into the joint body through the U-shaped pipe, the air outlet pipe and the air distribution pipe. The air is cooled by the condenser, and the oil vapor in the air is condensed, and then the air is discharged through the condensation return pipe. When the air is discharged from the bent pipe, it receives the reverse thrust of the gas, so that the air distribution pipe rotates, so that the cooled air is sprayed to different directions in the joint body, so that the air is evenly distributed, ensuring the uniformity of cooling.

[0024] 3. In the present invention, the ventilation joint for ventilation of an aircraft fuel tank monitors the temperature in the joint body through a temperature sensor. When the temperature sensor detects that the temperature rises, the controller controls the power of the air pump to increase accordingly, thereby increasing the air extraction speed, thereby increasing the rotation speed of the air distribution pipe. While the air distribution pipe is rotating, the active friction wheel and the driven friction wheel abut against each other to drive the rotating drum to rotate. While the rotating drum is rotating, the inclined rod slides outward along the inclined groove direction under the action of centrifugal force, and drives the sliding drum to approach the three-pronged plate through the abutment with the guide rod, so that the arc block squeezes the pressure sensor. When the pressure sensor detects that the pressure increases, the controller controls the power of the condenser to increase accordingly. When the rotation speed of the air distribution pipe increases, the power of the condenser can be further increased, thereby improving the cooling effect of the air in the joint body, so as to maintain the temperature balance in the fuel tank, and can improve the condensation effect of the oil vapor, avoiding waste of resources.

[0025] 4. In the present invention, the ventilation joint for ventilation of the aircraft fuel tank can adjust the temperature in the fuel tank through the condensation mechanism and linkage mechanism, and can condense and recover the fuel vapor, and can adjust the condensation effect according to the temperature to maintain temperature balance and avoid the fuel vapor from being discharged into the atmosphere to cause pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a ventilation joint for ventilation of an aircraft fuel tank proposed by the present invention;

[0027] Figure 2 A schematic cross-sectional view of a ventilation joint for ventilation of an aircraft fuel tank proposed by the present invention;

[0028] Figure 3 for Figure 2 A partial enlarged view of part A;

[0029] Figure 4 A schematic diagram of the three-dimensional structure of a ventilation joint for ventilation of an aircraft fuel tank proposed by the present invention from another perspective;

[0030] Figure 5 This is a schematic diagram of a cross-sectional structure of a ventilation joint for ventilation of an aircraft fuel tank proposed by the present invention when viewed from above;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the installation mechanism proposed by the present invention;

[0032] Figure 7 This is an exploded three-dimensional structural schematic diagram of the installation mechanism proposed by the present invention;

[0033] Figure 8 This is a schematic diagram of the three-dimensional structure of the positioning plate, knob and butterfly nut proposed in the present invention;

[0034] Fig. 9 A schematic diagram of the three-dimensional structure of the locking mechanism proposed by the present invention;

[0035] Fig.10 This is a schematic diagram of the three-dimensional structure of the air distribution pipe proposed by the present invention;

[0036] Fig.11 It is a three-dimensional structural schematic diagram of the linkage mechanism proposed by the present invention;

[0037] Fig.12 It is a cross-sectional structural schematic diagram of the linkage mechanism proposed by the present invention;

[0038] Fig.13 for Fig.12 A partial enlarged view of part B.

[0039] Fig.14 This is a schematic diagram of the three-dimensional structure of the air distribution pipe and linkage mechanism proposed in the present invention.

[0040] In the figure: 1, connector body; 101, rubber pad; 2, mounting mechanism; 201, knob; 20101, arc groove; 202, slotted flat end set screw; 203, connecting screw; 204, butterfly nut; 205, flat washer; 206, pressure block; 20601, long groove; 207, connector; 3, locking mechanism; 301, positioning plate; 30101, positioning groove; 302, fixing plate; 303, U-shaped rod; 304, connecting spring; 305, movable conductive sheet; 306, fixed conductive sheet; 307 , battery; 308, alarm; 4, air distribution pipe; 401, straight pipe; 402, curved pipe; 403, annular groove; 404, active friction wheel; 5, linkage mechanism; 501, rotating drum; 502, fixed shaft; 503, driven friction wheel; 504, inclined rod; 505, guide rod; 506, slide; 507, arc block; 508, pressure sensor; 509, limit rod; 510, three-pronged plate; 6, limit plate; 7, temperature sensor; 8, condenser; 9, air pump; 10, controller; 11, U-shaped tube. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figure 1-Figure 14 , a ventilation joint for ventilation of an aircraft fuel tank, comprising:

[0043] The joint body 1, the top of which is provided with a rubber pad 101;

[0044] The mounting mechanism 2 includes a connecting screw 203, a pressing block 206 and a butterfly nut 204. The connecting screw 203 is threadedly connected to the inside of the butterfly nut 204, and one end of the connecting screw 203 is fixedly connected to a connector 207, and the connector 207 is movably inserted in the pressing block 206. The other end of the connecting screw 203 is movably sleeved with a knob 201, and the outer side of the knob 201 is provided with a plurality of arc grooves 20101;

[0045] The locking mechanism 3 includes a storage battery 307, a fixed conductive sheet 306, an alarm 308 and two positioning plates 301. The positioning plates 301 are movably inserted into the corresponding arc-shaped grooves 20101, and one side of the positioning plates 301 is provided with a positioning groove 30101 adapted to the butterfly nut 204;

[0046] The condensation mechanism includes an air pump 9, a condenser 8 and an air distribution pipe 4. The air outlet of the air pump 9 is connected to the air outlet pipe. The air distribution pipe 4 is rotatably sleeved on the outside of the air outlet pipe, and a linkage mechanism 5 is provided at the bottom of the air distribution pipe 4.

[0047] In this embodiment, the battery 307 and the fixed conductive sheet 306 are fixedly installed at the bottom of the connector body 1, and the other side of the two positioning plates 301 is fixedly connected to the same U-shaped rod 303, and the bottom of the U-shaped rod 303 is fixedly installed with a movable conductive sheet 305, and the movable conductive sheet 305 is adapted to the fixed conductive sheet 306;

[0048] The positive pole of the battery 307 is electrically connected to the fixed conductive sheet 306, and the negative pole of the movable conductive sheet 305 and the battery 307 are electrically connected to the two ends of the alarm 308 respectively. After the movable conductive sheet 305 moves horizontally, it can contact the fixed conductive sheet 306, and the circuit of the battery 307 and the alarm 308 is turned on.

[0049] In this embodiment, the air distribution pipe 4 includes a straight pipe 401 and a plurality of curved pipes 402 integrally formed at one end of the straight pipe 401. An active friction wheel 404 is fixedly installed on the outer side of the straight pipe 401, and an annular groove 403 is opened on the outer side of the straight pipe 401. Two limit plates 6 are fixedly installed on the inner wall of the joint body 1, and the limit plates 6 are movably inserted in the annular groove 403.

[0050] The linkage mechanism 5 includes a fixed shaft 502, a rotating cylinder 501 and a plurality of pressure sensors 508. The fixed shaft 502 is fixedly connected to the inside of the joint body 1, and the rotating cylinder 501 is rotatably sleeved on the outside of the fixed shaft 502. A driven friction wheel 503 is fixedly sleeved on the outside of the rotating cylinder 501. The driven friction wheel 503 is movably abutted against the active friction wheel 404. The other end of the fixed shaft 502 is fixedly connected to a three-pronged plate 510, and the pressure sensor 508 is fixedly connected to one side of the three-pronged plate 510.

[0051] A plurality of inclined holes are provided on the outer side of the rotating cylinder 501, in which inclined rods 504 are slidably installed, a slide 506 is slidably sleeved on the outer side of the rotating cylinder 501, a guide rod 505 is fixedly installed on the outer side of the slide 506, the inclined rod 504 is slidably sleeved on the outer side of the guide rod 505, and a plurality of arc blocks 507 are slidably installed on the outer side of the slide 506, the arc blocks 507 perform circular motion along the outer edge of the slide 506, the arc blocks 507 are movably abutted against the other end of the corresponding pressure sensor 508, and a plurality of limit rods 509 are fixedly connected to one side of the arc block 507, the limit rods 509 are slidably connected to the inside of the tripod plate 510 to guide the arc blocks 507.

[0052] In this embodiment, two fixing plates 302 are fixedly installed at the bottom of the joint body 1. The two fixing plates 302 are slidably sleeved on the outside of the U-shaped rod 303, and a connecting spring 304 is fixedly connected to one side of the fixing plate 302. The other end of the connecting spring 304 is fixedly connected to the corresponding positioning plate 301. The positioning plate 301 is reset and auxiliary positioning is achieved through the connecting spring 304.

[0053] In this embodiment, the outer side of the knob 201 is threadedly connected with a slotted flat-end set screw 202, one end of which is movably abutted against the outer side of the connecting screw 203, and a flat washer 205 is sleeved on the outer side of the connecting screw 203, and the flat washer 205 is arranged between the butterfly nut 204 and the pressure block 206, so as to prevent loosening;

[0054] A long groove 20601 is provided at the top of the pressing block 206, and a socket is provided on the bottom inner wall of the long groove 20601. The connecting head 207 is movably inserted into the long groove 20601 and the socket. The cooperation between the connecting head 207 and the long groove 20601 prevents the pressing block 206 and the connecting screw 203 from rotating relative to each other. A disc is integrally formed at the top of the connecting head 207, and the disc movably abuts against the top of the pressing block 206.

[0055] In this embodiment, a temperature sensor 7 is fixedly installed in the joint body 1, and a controller 10 is fixedly installed at the bottom of the joint body 1. The temperature sensor 7, the pressure sensor 508, the air pump 9 and the condenser 8 are all connected to the control signal. When the temperature sensor 7 detects that the temperature rises, the power of the air pump 9 is controlled by the controller 10 to increase accordingly. When the pressure sensor 508 detects that the pressure increases, the power of the condenser 8 is controlled by the controller 10 to increase accordingly.

[0056] The condenser 8 and the air pump 9 are both fixedly mounted on the outside of the connector body 1, and a U-shaped tube 11 is connected between the air outlet of the condenser 8 and the air inlet of the air pump 9, the air inlet of the condenser 8 is connected to the connector, and the outside of the condenser 8 is connected to a condensation reflux pipe.

[0057] In this embodiment, when in use, first pull the U-shaped rod 303 to drive the positioning plate 301 to move, release the fixation of the knob 201 and the butterfly nut 204 and compress the connecting spring 304, then rotate the knob 201 to drive the connecting screw 203 to rotate 90 degrees, and the connecting screw 203 drives the pressing block 206 to rotate 90 degrees through the connecting head 207, then insert the top end of the joint body 1 into the vent of the aircraft fuel tank, and make the foot pad abut against the outer wall of the aircraft fuel tank, then control the knob 201 to drive the pressing block 206 to rotate 90 degrees in the opposite direction, and then hold the knob 201 so that the connecting screw 203 cannot rotate, and at the same time Rotate the butterfly nut 204, and the threaded cooperation between the butterfly nut 204 and the connecting screw 203 drives the pressure connecting screw 203 to move axially, and makes the pressure block 206 abut against the inner wall of the oil tank, and continue to tighten to increase the pre-tightening force, so that the rubber pad 101 and the oil tank are closely fitted to achieve sealing, and then loosen the U-shaped rod 303, so that the positioning plate 301 is reset under the action of the connecting spring 304, and inserted into the arc groove 20101, and the butterfly nut 204 is inserted into the positioning groove 30101, so as to lock the rotation of the knob 201 and the butterfly nut 204, thereby improving the installation sealing and stability of the ventilation joint;

[0058] In the subsequent use process, when the positioning plate 301 shakes and loosens to break away from the locking of the knob 201 and the butterfly nut 204, the positioning plate 301 drives the movable conductive sheet 305 to contact the fixed conductive sheet 306 through the U-shaped rod 303, so that the circuit of the battery 307 and the alarm 308 is connected, and the alarm 308 generates an alarm signal to promptly remind the staff to troubleshoot the problem;

[0059] By starting the air pump 9 and the condenser 8, the air pump 9 draws the air in the joint body 1 into the condenser 8, and then the air is discharged back into the joint body 1 through the U-shaped tube 11, the air outlet pipe and the air distribution pipe 4, and the air is cooled by the condenser 8, and the oil vapor in the air is condensed, and then discharged through the condensation return pipe, and the air receives the reverse thrust of the gas when it is discharged from the elbow 402, so that the air distribution pipe 4 rotates, so that the cooled air is sprayed to different directions in the joint body 1, so that the air is evenly distributed, ensuring the uniformity of cooling;

[0060] The temperature inside the joint body 1 is monitored by the temperature sensor 7. When the temperature sensor 7 detects that the temperature rises, the controller 10 controls the power of the air pump 9 to increase accordingly, thereby increasing the air extraction speed, thereby increasing the rotation speed of the air distribution pipe 4. While the air distribution pipe 4 rotates, the active friction wheel 404 and the driven friction wheel 503 abut against each other, and the rotating drum 501 is driven to rotate. While the rotating drum 501 rotates, the inclined rod 504 slides outward along the inclined groove direction under the action of centrifugal force, and drives the slide 506 to approach the three-pronged plate 510 through the abutment with the guide rod 505, so that the arc block 507 squeezes the pressure sensor 508. When the pressure sensor 508 detects that the pressure increases, the controller 10 controls the power of the condenser 8 to increase accordingly. When the rotation speed of the air distribution pipe 4 increases, the power of the condenser 8 can be further increased, thereby improving the cooling effect on the air in the joint body 1, so as to maintain the temperature balance in the oil tank, and can improve the condensation effect on the oil vapor, thereby avoiding waste of resources.

[0061] The above is a detailed introduction to a ventilation joint for ventilation of an aircraft fuel tank provided by the present invention. Specific embodiments are used in this article to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A ventilation joint for ventilation of aircraft fuel tank, characterized in that: include: A joint body (1), wherein a rubber pad (101) is arranged on the top of the joint body (1); A mounting mechanism (2), the mounting mechanism (2) comprising a connecting screw (203), a pressing block (206) and a butterfly nut (204), the connecting screw (203) being threadedly connected to the inside of the butterfly nut (204), one end of the connecting screw (203) being fixedly connected to a connecting head (207), the connecting head (207) being movably inserted into the pressing block (206), and the other end of the connecting screw (203) being movably sleeved with a knob (201), and a plurality of positioning grooves (30101) being provided on the outer side of the knob (201); A locking mechanism (3), the locking mechanism (3) comprising a storage battery (307), a fixed conductive sheet (306), an alarm (308) and two positioning plates (301), the positioning plates (301) being movably inserted into the corresponding positioning grooves (30101), and a positioning groove (30101) adapted to the butterfly nut (204) is provided on one side of the positioning plate (301); A condensation mechanism, the condensation mechanism comprising an air pump (9), a condenser (8) and an air distribution pipe (4); the air outlet of the air pump (9) is connected to an air outlet pipe, the air distribution pipe (4) is rotatably sleeved on the outside of the air outlet pipe, and a linkage mechanism (5) is provided at the bottom of the air distribution pipe (4).

2. A ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: The storage battery (307) and the fixed conductive sheet (306) are both fixedly mounted on the bottom of the connector body (1), and the other side of the two positioning plates (301) is fixedly connected to the same U-shaped rod (303), and a movable conductive sheet (305) is fixedly mounted on the bottom of the U-shaped rod (303), and the movable conductive sheet (305) is adapted to the fixed conductive sheet (306); The positive electrode of the battery (307) is electrically connected to the fixed conductive sheet (306), and the negative electrode of the movable conductive sheet (305) and the battery (307) are electrically connected to two ends of the alarm (308) respectively. After the movable conductive sheet (305) moves horizontally, it can contact the fixed conductive sheet (306), and the circuit of the battery (307) and the alarm (308) is turned on.

3. A ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: The air distribution pipe (4) comprises a straight pipe (401) and a plurality of curved pipes (402) integrally formed at one end of the straight pipe (401); an active friction wheel (404) is fixedly mounted on the outer side of the straight pipe (401); and an annular groove (403) is provided on the outer side of the straight pipe (401); two limit plates (6) are fixedly mounted on the inner wall of the joint body (1); and the limit plates (6) are movably inserted into the annular groove (403); The linkage mechanism (5) comprises a fixed shaft (502), a rotating cylinder (501) and a plurality of pressure sensors (508); the fixed shaft (502) is fixedly connected to the inside of the joint body (1), and the rotating cylinder (501) is rotatably sleeved on the outside of the fixed shaft (502); a driven friction wheel (503) is fixedly sleeved on the outside of the rotating cylinder (501); the driven friction wheel (503) is movably abutted against the active friction wheel (404); the other end of the fixed shaft (502) is fixedly connected to a three-pronged plate (510); and the pressure sensor (508) is fixedly connected to one side of the three-pronged plate (510); A plurality of inclined holes are provided on the outer side of the rotating cylinder (501), and an inclined rod (504) is slidably installed in the inclined holes. A slide cylinder (506) is slidably sleeved on the outer side of the rotating cylinder (501), and a guide rod (505) is fixedly installed on the outer side of the slide cylinder (506). The inclined rod (504) is slidably sleeved on the outer side of the guide rod (505), and a plurality of arc blocks (507) are slidably installed on the outer side of the slide cylinder (506), and the arc blocks (507) perform circular motion along the outer edge of the slide cylinder (506). The arc blocks (507) are movably abutted against the other end of the corresponding pressure sensor (508), and a plurality of limit rods (509) are fixedly connected to one side of the arc block (507), and the limit rods (509) are slidably connected to the inside of the three-pronged plate (510).

4. A ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: Two fixing plates (302) are fixedly installed at the bottom of the joint body (1), and the two fixing plates (302) are slidably sleeved on the outside of the U-shaped rod (303), and a connecting spring (304) is fixedly connected to one side of the fixing plate (302), and the other end of the connecting spring (304) is fixedly connected to the corresponding positioning plate (301).

5. The ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: The outer side of the knob (201) is threadedly connected with a slotted flat-end set screw (202), one end of which is movably abutted against the outer side of the connecting screw (203), and the outer side of the connecting screw (203) is sleeved with a flat washer (205), and the flat washer (205) is arranged between the butterfly nut (204) and the pressure block (206); The top of the pressing block (206) is provided with a long groove (20601), and the bottom inner wall of the long groove (20601) is provided with a socket. The connecting head (207) is movably inserted into the long groove (20601) and the socket. The top of the connecting head (207) is integrally formed with a disc, and the disc movably abuts against the top of the pressing block (206).

6. A ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: A temperature sensor (7) is fixedly installed in the joint body (1), and a controller (10) is fixedly installed at the bottom of the joint body (1). The temperature sensor (7), the pressure sensor (508), the air pump (9) and the condenser (8) are all connected to the control signal. When the temperature sensor (7) detects that the temperature rises, the controller (10) controls the power of the air pump (9) to increase accordingly. When the pressure sensor (508) detects that the pressure increases, the controller (10) controls the power of the condenser (8) to increase accordingly.

7. A ventilation joint for ventilation of an aircraft fuel tank according to claim 1, characterized in that: The condenser (8) and the air pump (9) are both fixedly mounted on the outside of the joint body (1), and a U-shaped tube (11) is connected between the air outlet of the condenser (8) and the air inlet of the air pump (9), the air inlet of the condenser (8) is connected to the joint, and a condensation reflux pipe is connected to the outside of the condenser (8).

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