Fuel tank oil drainage device and aircraft

Abstract

According to the fuel tank oil drainage device and the aircraft, a shell and a valve in the device are provided with clamping structures matched with each other, and when the valve is rotated leftwards, the valve can be ejected out downwards under the acting force of an elastic piece; the shell and the pressing sleeve are pressed tightly and fixed to the oil tank wall, and the sealing ring is arranged between the shell and the oil tank wall and used for sealing the shell and the oil tank wall. The gasket is arranged between the pressing sleeve and the oil tank wall and used for sealing the pressing sleeve and the oil tank wall, and the upper portion of the pressing sleeve is locked through the fixing piece. The elastic piece is located on the inner side of the valve, one end of the elastic piece abuts against the inner side end face of the valve, and a base is arranged at the other end of the elastic piece and fixed to the shell. An upper sealing ring and a lower sealing ring are arranged at the contact position of the outer side of the valve and the shell, the upper sealing ring is located above the lower sealing ring, and the lower sealing ring is used for sealing the shell and the valve when the valve is in a natural position; the upper sealing ring is used for sealing the shell and the valve when the valve is in the maintenance position; fuel oil in the fuel tank does not need to be completely discharged during maintenance, and the current rapid maintenance requirement can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft fuel systems and relates to a fuel tank oil discharge device and an aircraft. Background Art

[0002] The fuel tank drain device is installed on the lower surface of the aircraft wing fuel tank. When the fuel tank drain device is pushed open, gravity is used to settle the water in the fuel tank and the fuel flows out.

[0003] In the prior art, fuel tank drain devices are sealed by sealing rubber. When impurities in the fuel scratch the rubber pad, the rubber pad seal will fail, causing the fuel tank drain device to fail to seal effectively in the locked state. At this time, the damaged rubber pad needs to be replaced. Before replacement, all the fuel in the fuel tank needs to be drained and the fuel tank drain device needs to be removed. The drained fuel cannot be directly loaded into the fuel tank. This fuel tank drain device will waste a lot of fuel during maintenance, and it is time-consuming and labor-intensive, and can no longer meet the current demand for rapid maintenance. Summary of the invention

[0004] In order to solve the technical problem that a large amount of fuel is wasted and time-consuming and labor-intensive during maintenance of a fuel tank draining device in the related art, the present invention provides a fuel tank draining device and an aircraft, which does not require all the fuel in the fuel tank to be drained, does not waste a large amount of fuel, and has a better effect. The technical solution is as follows:

[0005] In a first aspect, a fuel tank draining device is provided, comprising: a housing 1, a sealing ring 2, a gasket 3, a compression sleeve 4, a valve 6, an elastic member 7, a base 8, an upper sealing ring 111, and a lower sealing ring 112;

[0006] The housing 1 is located outside the valve 6. The housing 1 and the valve 6 are provided with a matching clamping structure. When the valve 6 is rotated to the left, the valve 6 will be pushed downward by the force of the elastic member 7. The housing 1 is pressed tightly with the pressing sleeve 4 and fixed on the oil tank wall. The sealing ring 2 is arranged between the housing 1 and the oil tank wall for sealing the housing 1 and the oil tank wall. The gasket 3 is arranged between the pressing sleeve 4 and the oil tank wall for sealing between the pressing sleeve 4 and the oil tank wall. The upper part of the pressing sleeve 4 is locked with a fixing member.

[0007] The elastic member 7 is located inside the valve 6, and one end of the elastic member 7 is against the inner end surface of the valve 6, and the other end is provided with a base 8, and the base 8 is fixed on the housing 1;

[0008] An upper sealing ring 111 and a lower sealing ring 112 are provided at the position where the outer side of the valve 6 contacts the shell 1. The upper sealing ring 111 is located above the lower sealing ring 112. The sealing ring 112 is used to seal the shell 1 and the valve 6 when the valve 6 is in the natural position; the upper sealing ring 111 is used to seal the shell 1 and the valve 6 when the valve 6 is in the maintenance position.

[0009] Furthermore, a gasket 10 is provided on the inner end surface of the valve 6 to buffer the spring 7 .

[0010] Furthermore, a threaded pin 9 is provided on the spring seat 8 , and the threaded pin 9 is used to fix the spring seat 8 to the housing 1 .

[0011] Furthermore, the device also includes a steel sleeve 12, which is located at the bottom of the valve 6 and is used to connect an external maintenance tool.

[0012] In one possible implementation, when the valve 6 is in the natural position, it is kept locked under the force of the elastic member 7 and sealed by the lower sealing ring 112;

[0013] When the lower sealing ring 112 is damaged, the valve 6 is rotated leftward, and the device changes to a maintenance state. Under the action of the elastic member 7, the lower sealing ring 112 is exposed and sealed by the upper sealing ring 111. At this time, the lower sealing ring 112 can be replaced.

[0014] Wherein, the fixing piece is a nut.

[0015] Optionally, the elastic member is a spring and the base is a spring seat.

[0016] In a second aspect, an aircraft is provided, comprising a fuel tank draining device as described in any one of the first aspects.

[0017] The beneficial effects of the present invention are at least:

[0018] In the case that the lower sealing ring is damaged, it can be exposed during replacement for easy replacement. At this time, the added sealing ring can play a sealing role to ensure that the oil will not leak out. The added sealing ring generally will not be damaged, and even if it is damaged, it will be a small damage. At this time, if the sealing ring needs to be replaced, a small amount of oil will leak out. It can be replaced directly without draining all the fuel in the fuel tank, which will not waste a lot of fuel and will have a better effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the fuel tank drain device;

[0020] Figure 2 This is a schematic diagram of the closed state of the present invention;

[0021] Figure 3 This is a schematic diagram of the oil discharge state of the present invention;

[0022] Figure 4 This is a schematic diagram of the maintenance state of the present invention;

[0023] Among them: 1-housing; 2-sealing ring; 3-washer; 4-pressing sleeve; 5-nut; 6-valve; 7-spring; 8-spring seat; 9-thread pin; 10-gasket; 111-upper sealing ring; 112-lower sealing ring; 12-steel sleeve. DETAILED DESCRIPTION

[0024] The present application is further described in detail below through specific implementation methods and drawings.

[0025] An embodiment of the present invention provides a fuel tank draining device, see Figure 1 , including: a housing 1; a sealing ring 2; a gasket 3; a pressing sleeve 4; a fixing member; a valve 6; an elastic member; a base; an upper sealing ring 111; and a lower sealing ring 112;

[0026] The housing 1 is located outside the valve 6. The housing 1 and the valve 6 are provided with a matching clamping structure. When the valve 6 is rotated to the left, the valve 6 is pushed downward by the force of the spring 7.

[0027] The housing 1 is pressed tightly against the pressing sleeve 4 and fixed on the oil tank wall. The sealing ring 2 is arranged between the housing 1 and the oil tank wall to seal the housing 1 and the oil tank wall.

[0028] The gasket 3 is arranged between the pressing sleeve 4 and the oil tank wall to seal between the pressing sleeve 4 and the oil tank wall, and the pressing sleeve 4 is locked with a fixing piece above;

[0029] The elastic member 7 is located inside the valve 6, and one end of the elastic member 7 is against the inner end surface of the valve 6, and the other end is provided with a base 8 for fixing the elastic member 7, and the base 8 is fixed on the housing 1;

[0030] An upper sealing ring 111 and a lower sealing ring 112 are provided at the position where the outer side of the valve 6 contacts the housing 1. The upper sealing ring 111 is located above the lower sealing ring 112. The sealing ring 112 is used to seal the housing 1 and the valve 6 when the valve 6 is in the natural position (the position where the valve 6 is normally locked); the upper sealing ring 111 is used to seal the housing 1 and the valve 6 when the valve 6 is in the maintenance position (the position where the valve 6 is when the lower sealing ring 112 needs to be replaced);

[0031] When the valve 6 is in the natural position, it remains locked under the force of the elastic member 7 and is sealed by the lower sealing ring 112 .

[0032] When the lower sealing ring 112 is damaged, the valve 6 can be rotated to the left, and the product becomes a maintenance state. Under the action of the spring force, the lower sealing ring 112 is exposed and sealed by the upper sealing ring 111. At this time, the lower sealing ring 112 can be replaced without removing the fuel tank drain device and draining the fuel in the tank.

[0033] The working principle of the present invention is as follows:

[0034] (1) Under normal circumstances, the product is in a closed state, and the lower sealing ring 112 on the valve realizes the sealing of the valve 6 and the housing 1, cutting off the oil circuit. Figure 2 As shown;

[0035] (2) When the product needs to open the oil drain switch to drain the oil, use a tool to push the valve 6 upward and turn it to the right to lock the product in the open position. The valve 6 opens. Figure 3 As shown;

[0036] (3) When the lower sealing ring 112 of the product is damaged by sediment, it is necessary to switch to maintenance mode. Rotate the valve 6 to the left to the maintenance position. The valve 6 is pushed downward by the force of the elastic member 7. At this time, the upper sealing ring 111 on the valve 6 realizes the sealing of the valve 6 and the housing 1, cutting off the oil path. The lower sealing ring 112 can be replaced without releasing the fuel in the fuel tank. After replacing the lower sealing ring 112, push the valve 6 upward and rotate it to the right to put the valve 6 in a normal closed state. The maintenance state is as follows: Figure 4 shown.

[0037] An embodiment of the present invention further provides a fuel tank draining device, see Figure 1 , including: housing 1; sealing ring 2; gasket 3; pressing sleeve 4; nut 5; valve 6; spring 7; spring seat 8; threaded pin 9; gasket 10; upper sealing ring 111; lower sealing ring 112 and steel sleeve 12;

[0038] The shell 1 is located on the outside of the valve 6. The shell 1 and the valve 6 are provided with a matching clamping structure. When the valve 6 is rotated to the left, the valve 6 will be pushed downward by the force of the spring 7. The shell 1 is pressed tightly with the pressing sleeve 4 and fixed on the oil tank wall. The sealing ring 2 is arranged between the shell 1 and the oil tank wall for sealing the shell 1 and the oil tank wall. The gasket 3 is arranged between the pressing sleeve 4 and the oil tank wall for sealing between the pressing sleeve 4 and the oil tank wall. The top of the pressing sleeve 4 is locked with a nut 5. The spring 7 is located on the inside of the valve 6, and one end of the spring 7 is against the inner end face of the valve 6. The other end of the spring 7 is provided with a spring seat 8 for fixing the spring 7, and the spring seat 8 is provided with Threaded pin 9, threaded pin 9 is used to connect and fix the spring seat 8 to the housing 1; the inner end face of the valve 6 is also provided with a gasket 10, which is used to buffer the spring 7; the outer side of the valve 6 is provided with an upper sealing ring 111 and a lower sealing ring 112 at the position where the valve 6 contacts the housing 1, the upper sealing ring 111 is located above the lower sealing ring 112, and the sealing ring 112 is used to seal the housing 1 and the valve 6 when the valve 6 is in the natural position (the position where the valve 6 is normally locked); the upper sealing ring 111 is used to seal the housing 1 and the valve 6 when the valve 6 is in the maintenance position (the position where the valve 6 is when the lower sealing ring 112 needs to be replaced).

[0039] The steel sleeve 12 is located at the bottom of the valve 6 and can be connected to an external maintenance tool. The steel sleeve 12 is used to protect the valve 6. Lifting the steel sleeve 12 drives the valve 6 to move and open the oil release channel. Rotating it to the right can ensure the open state and realize oil release.

[0040] When the valve 6 is in the natural position, it remains locked under the spring force of the spring 7 and is sealed by the lower sealing ring 112.

[0041] When the lower sealing ring 112 is damaged, the valve 6 can be rotated to the left, and the product becomes a maintenance state. Under the action of the spring force, the lower sealing ring 112 is exposed and sealed by the upper sealing ring 111. At this time, the lower sealing ring 112 can be replaced without removing the fuel tank drain device and draining the fuel in the tank.

[0042] Another embodiment of the present invention further provides an aircraft, including the fuel tank draining device provided in the embodiment of the present invention, such as Figure 1 shown.

[0043] 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. A fuel tank draining device, characterized in that: include: Shell, sealing ring, gasket, compression sleeve, valve, elastic part, base, upper sealing ring, lower sealing ring; The shell is located outside the valve, and the shell and the valve are provided with a matching clamping structure. When the valve is rotated to the left, the valve will be pushed downward by the force of the elastic member; the shell and the pressing sleeve are pressed tightly and fixed on the oil tank wall, and the sealing ring is arranged between the shell and the oil tank wall for sealing the shell and the oil tank wall; the gasket is arranged between the pressing sleeve and the oil tank wall for sealing between the pressing sleeve and the oil tank wall, and the upper part of the pressing sleeve is locked with a fixing member; The elastic member is located inside the valve, and one end of the elastic member abuts against the inner end surface of the valve, and the other end is provided with a base, which is fixed on the shell; An upper sealing ring and a lower sealing ring are provided at the position where the outer side of the valve contacts the shell. The upper sealing ring is located above the lower sealing ring. The lower sealing ring is used to seal the shell and the valve when the valve is in the natural position; the upper sealing ring is used to seal the shell and the valve when the valve is in the maintenance position.

2. The device according to claim 1, characterized in that The inner end surface of the valve is also provided with a gasket which plays a buffering role on the spring.

3. The device according to claim 1, characterized in that The spring seat is provided with a threaded pin for fixing the spring seat to the housing.

4. The device according to claim 1, characterized in that The device also includes a steel sleeve, which is located at the bottom of the valve.

5. The device according to claim 1, characterized in that 。 When the valve is in the natural position, it remains locked under the force of the elastic member and is sealed by the lower sealing ring; When the lower sealing ring is damaged, rotate the valve to the left and the device will be in maintenance state. Under the action of the elastic part, the lower sealing ring is exposed and sealed by the upper sealing ring. At this time, the lower sealing ring can be replaced.

6. The device according to claim 1, characterized in that The fixing piece is a nut.

7. The device according to claim 1, characterized in that The elastic member is a spring, and the base is a spring seat.

8. An aircraft, characterized in that: It comprises the fuel tank draining device as described in any one of claims 1 to 7.

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