阅读说明：本技术 空中加油用安全阀 (Safety valve for air refueling ) 是由 单文涛 施华 杨星 于 2019-10-30 设计创作，主要内容包括：本发明提供一种空中加油用安全阀,采用带膜片的跟随式活门结构,通过活塞弹簧来实现压力的控制,并采取零件尺寸匹配的方式来平衡因飞行高度变化带来的大气、货舱双重负压影响,使安全阀的开启和关闭不受双重负压的影响,活门运动处采取了密封减磨抗振设计。(The invention provides a safety valve for air refueling, which adopts a following type valve structure with a diaphragm, realizes pressure control through a piston spring, balances the double negative pressure influence of atmosphere and a cargo hold caused by flight height change by adopting a part size matching mode, ensures that the opening and the closing of the safety valve are not influenced by the double negative pressure, and adopts a sealing wear-reducing and vibration-resisting design at the movement part of the valve.)

1. A relief valve for aerial refueling, comprising: a housing (1), a cover (8), a piston assembly and a diaphragm (15); the piston assembly includes: the piston spring (4), the valve seat (5), the valve (11) and the piston (16); wherein the content of the first and second substances,

one end of the shell (1) is communicated with the atmosphere, the other end of the shell (1) is connected with one end of the cover (8), the other end of the cover (8) is communicated with the oil tank, and the shell (1) is further provided with a pressure sensing port (21) connected with the cargo hold; an inner cavity communicated with the shell (1) and the cover (8) is formed between the shell and the cover; a spring groove is formed in the inner wall of the shell (1), and the piston spring (4) is arranged in the spring groove;

the piston (16) is sleeved in the shell (1), and the piston spring (4) is arranged between the piston (16) and the shell (1); one end of the valve seat (5) is sleeved in the piston (16); the valve (11) is arranged in the cover (8);

the diaphragm (15) is in a circle shape, the outer ring of the diaphragm (15) is arranged between the shell (1) and the cover (8), and the inner ring of the diaphragm (15) is arranged between the valve seat (5) and the piston (16);

the membrane (15) is used for sensing the pressure difference between the oil tank and the cargo hold, and when the pressure difference is not greater than a preset pressure value, the valve (11) is in contact with the other end of the valve seat (5), so that the oil tank is not communicated with the atmosphere; when the pressure difference is greater than a preset pressure value, the valve seat (5) and the piston (16) move towards one end of the shell (1) communicated with the atmosphere, so that the valve (11) is separated from the other end of the valve seat (5), and the oil tank is communicated with the atmosphere.

2. Safety valve for airborne refuelling according to claim 1, characterized in that a shutter passage of said shutter (11) is provided in said cover (8), said shutter (11) being movable along said shutter passage.

3. The safety valve for aerial refueling according to claim 2, further comprising: a self-locking nut (12);

the self-locking nut (12) is arranged at one end, far away from the valve seat (5), of the valve (11).

4. The safety valve for airborne fuel filling of claim 3, further comprising: the shutter spring (13);

the valve spring (13) is sleeved at one end of the valve (11) close to the valve seat (5).

5. The safety valve for aerial refueling according to claim 1, further comprising: a seal ring (2);

the inner wall of the shell (1) in contact with the piston (16) is further provided with a sealing groove, and a sealing ring (2) is arranged in the sealing groove.

6. Safety valve for airborne fuel filling according to claim 1, characterized in that the housing (1) and the cover (8) are fastened by means of screws (7).

7. The safety valve for airborne fuel filling according to claim 1, characterized in that a piston limit structure of the piston (16) is further provided on the inner wall of the housing (1).

8. Safety valve for airborne fuel filling according to claim 1, characterized in that a sieve (17) is arranged at the pressure sensing port (21) of the housing (1).

9. Safety valve for airborne fuel filling according to claim 8, characterized in that a collar (18) is provided at the sieve (17).

Technical Field

The invention relates to the technical field of fluid precision control, in particular to a safety valve for air refueling.

Background

The aircraft is provided with a safety valve which is used for controlling the upper limit of the pressure value of the oil tank and is a core component for ensuring the safety of the oil tank.

The existing safety valves on the airplane are in a relative pressure direct-acting structural form, the pressure of an oil tank and the atmospheric pressure are detected, and when the pressure of the oil tank reaches the opening pressure of the oil tank, the oil is exhausted outside the airplane or discharged to realize pressure relief.

However, the oil tank of the aerial tanker is used for supplying fuel to other airplanes in the air, and the oil tank of the aerial tanker is positioned in the cargo compartment of the tanker, so that the safety valve of the existing oil tank cannot be directly adopted.

Disclosure of Invention

The embodiment of the invention provides a safety valve for air refueling, which ensures that the opening and closing of a fuselage oil tank are not influenced by a negative pressure environment caused by the change of the flying height of an airplane, and has stable and reliable performance and long service life.

The embodiment of the invention provides a safety valve for air refueling, which comprises: housing 1, cover 8, piston assembly and diaphragm 15; the piston assembly includes: a piston spring 4, a valve seat 5, a valve 11 and a piston 16; wherein the content of the first and second substances,

one end of the shell 1 is communicated with the atmosphere, the other end of the shell 1 is connected with one end of the cover 8, the other end of the cover 8 is communicated with the oil tank, and the shell 1 is further provided with a pressure sensing port 21 connected with the cargo compartment; an inner cavity communicated between the shell 1 and the cover 8; a spring groove is formed in the inner wall of the shell 1, and the piston spring 4 is arranged in the spring groove;

the piston 16 is sleeved in the shell 1, and the piston spring 4 is arranged between the piston 16 and the shell 1; one end of the valve seat 5 is sleeved in the piston 16; the shutter 11 is arranged inside the cover 8;

the diaphragm 15 is in a circular ring shape, the outer ring of the diaphragm 15 is arranged between the shell 1 and the cover 8, and the inner ring of the diaphragm 15 is arranged between the valve seat 5 and the piston 16;

the membrane 15 is used for sensing the pressure difference between the oil tank and the cargo hold, and when the pressure difference is not greater than a preset pressure value, the valve 11 is in contact with the other end of the valve seat 5, so that the oil tank is not communicated with the atmosphere; when the pressure difference is greater than a preset pressure value, the valve seat 5 and the piston 16 move towards one end of the shell 1 communicated with the atmosphere, so that the valve 11 is separated from the other end of the valve seat 5, and the oil tank is communicated with the atmosphere.

In a possible embodiment, a shutter channel of the shutter 11 is provided in the cover 8, along which the shutter 11 is movable.

In one possible embodiment, the safety valve for airborne fueling further comprises: a self-locking nut 12;

the end of the valve 11 far away from the valve seat 5 is provided with the self-locking nut 12.

In one possible embodiment, the safety valve for airborne fueling further comprises: the shutter spring 13;

the valve spring 13 is sleeved at one end of the valve 11 close to the valve seat 5.

In one possible embodiment, the safety valve for airborne fueling further comprises: a seal ring 2;

and a sealing groove is also formed in the inner wall, in contact with the piston 16, of the shell 1, and a sealing ring 2 is arranged in the sealing groove.

In a possible embodiment, the housing 1 and the cover 8 are fastened by screws 7.

In a possible embodiment, a piston limiting structure of the piston 16 is further disposed on the inner wall of the housing 1.

In a possible embodiment, a filter screen 17 is arranged at the pressure sensing opening 21 of the housing 1.

In a possible embodiment, a retainer ring 18 is arranged at the filter screen 17.

The safety valve for air refueling provided by the embodiment of the invention adopts a following type valve structure with a diaphragm, realizes pressure control through a piston spring, balances double negative pressure influences of atmosphere and a cargo hold caused by flight height changes, ensures that the opening and closing of the safety valve are not influenced by the double negative pressure, and adopts a sealing wear-reducing and vibration-resisting design at the movement position of the valve.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic structural diagram of a safety valve for aerial refueling according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of a safety valve for aerial refueling according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a cover according to an embodiment of the present invention;

description of reference numerals:

1-a housing; 2, sealing rings; 3, a gasket;

4-piston spring; 5, a valve seat; 6-a gasket;

7-screws; 8, covering; 9, sealing rings;

10, sealing rings; 11-a shutter; 12-self-locking nut;

13-valve spring; 14-a sealing ring; 15-a membrane;

16-a piston; 17-a filter screen; 18-a retainer ring;

19-safety valve inlet 20-outlet; 21-pressure sensing port.

Detailed Description

Fig. 1 is a first structural schematic diagram of a safety valve for aerial refueling according to an embodiment of the present invention, and fig. 2 is a second structural schematic diagram of a safety valve for aerial refueling according to an embodiment of the present invention. As shown in fig. 1 and 2, the safety valve for aerial refueling includes: housing 1, cover 8, piston assembly and diaphragm 15; the piston assembly includes: a piston spring 4, a valve seat 5, a valve 11 and a piston 16; wherein the content of the first and second substances,

one end of the shell 1 is communicated with the atmosphere, the other end of the shell 1 is connected with one end of the cover 8, the other end of the cover 8 is communicated with the oil tank, and the shell 1 is also provided with a pressure sensing port 21 connected with the cargo hold; an inner cavity communicated between the shell 1 and the cover 8 is formed; a spring groove is formed in the inner wall of the shell 1, and a piston spring 4 is arranged in the spring groove;

the piston 16 is sleeved in the shell 1, and the piston spring 4 is arranged between the piston 16 and the shell 1; one end of the valve seat 5 is sleeved in the piston 16; the shutter 11 is arranged inside the cover 8;

the diaphragm 15 is in a circle shape, the outer ring of the diaphragm 15 is arranged between the shell 1 and the cover 8, and the inner ring of the diaphragm 15 is arranged between the valve seat 5 and the piston 16;

the membrane 15 is used for sensing the pressure difference between the oil tank and the cargo hold, and when the pressure difference is not greater than a preset pressure value, the valve 11 is contacted with the other end of the valve seat 5, so that the oil tank is not communicated with the atmosphere; when the pressure difference is greater than the preset pressure value, the valve seat 5 and the piston 16 move towards one end of the housing 1 communicating with the atmosphere, so that the valve 11 is separated from the other end of the valve seat 5, and the oil tank communicates with the atmosphere.

Illustratively, the spring slot bottom may also be provided with a shim 3.

For example, fig. 3 is a schematic structural view of a cover according to an embodiment of the present invention, and as shown in fig. 3, a shutter passage of the shutter 11 is provided in the cover 8, and the shutter 11 is movable along the shutter passage.

Illustratively, the end of the shutter 11 remote from the shutter seat 5 is provided with a self-locking nut 12.

Illustratively, one end of the shutter 11 close to the shutter seat 5 is sleeved with a shutter spring 13.

Illustratively, a sealing groove is further arranged on the inner wall of the shell 1, which is in contact with the piston 16, and a sealing ring 2 is arranged in the sealing groove.

Illustratively, the housing 1 and the cover 8 are fastened by screws 7. The screw 7 is also sleeved with a gasket 6.

Illustratively, a piston limiting structure of the piston 16 is further arranged on the inner wall of the shell 1.

Illustratively, a filter screen 17 is arranged at the pressure sensing port 21 of the shell 1.

Illustratively, a retainer ring 18 is disposed at the screen 17.

A sealing gasket 14 is also provided, for example, between the valve seat 5 and the piston 16.

Illustratively, the safety valve inlet 19 of the cover 8 can be communicated with the oil tank of the fuselage through a flange, and the sealing rings 9 and 10 are further arranged on the outer side of the cover 8. The outlet 20 is connected with a pipeline of the machine body through a flexible joint and communicated with the atmosphere, the pressure sensing port 21 is directly communicated with the cargo hold, and the cargo hold is not communicated with the atmosphere. When the difference between the pressure in the oil tank of the fuselage and the pressure in the cargo compartment is lower than the opening pressure, the flap 11 is in the closed state under the sealing force of the piston spring 4, as shown in fig. 1.

Along with the change of the flying height of the airplane, the pressure in the cargo hold also changes within a certain range, but the piston spring 4 only senses the pressure difference between the oil tank of the airplane body and the cargo hold, when the pressure difference between the oil tank of the airplane body and the cargo hold reaches the pressure for opening the valve 11, the air pressure acts on the membrane 15 and is amplified, so that the membrane 15 is overcome the sealing force of the piston spring 4, the membrane 15 is pushed to drive the piston 16 to move towards the outlet direction, the valve 11 is limited by the self-locking nut 12, the membrane 15 and the piston 16 continue to move, the valve 11 is separated from the valve seat 5 to form a channel, and the air is exhausted to the atmosphere, so that the normal use of the system is ensured, as shown in fig. 2, and a dotted line in. Along with the continuous discharge of the gas in the oil tank of the fuselage, the pressure of the gas is gradually reduced, the pressure difference between the pressure in the oil tank of the fuselage and the pressure in the cargo hold is continuously reduced, and the valve is restored to the closed state under the action of the elastic force of the piston spring 4.

The invention has the advantages that:

1. the performance is stable and reliable. In order to ensure the stability and the sealing performance of the pressure regulation of the safety valve, the valve structure adopts a double circle type rubber sealing ring form, the abrasion reduction and vibration resistance effects are realized while the sealing is formed, and the valve moves smoothly. The safety valve is internally provided with a limiting structure, so that the valve can still keep good sealing performance after repeated movement, the stroke is not obviously changed, and the performance of the product is stable and reliable.

2. The voltage regulation control is precise. The rubber cloth clamping membrane is used as a pressure sensing element and can amplify pressure; the pressure is controlled by the piston spring, and the follow-up stroke of the valve is controlled by adjusting the self-locking nut to realize fine adjustment control of the pressure.

3. High flow rate and low flow resistance. The product adopts unique channel design, the internal channel is compact, the flow channel has no turn, the drift diameter change is small, the pressure loss of the internal flow channel is reduced, and the large flow and low flow resistance can be realized.

4. And (4) balance unloading design. The size of the valve sealing position and the size of the piston internal channel are designed to be the same, the wall thickness size of the piston sealing position is reduced, the adverse effect of the double negative pressure of the safety valve in the cargo compartment and the atmosphere on the valve closing under the high-altitude environment is reduced, and the opening and closing of the safety valve are not affected by the double negative pressure of the cargo compartment and the atmosphere.

5. And (4) double sealing. The inlet of the safety valve is in a flange double seal structure, and the outlet of the safety valve is in a flexible joint double seal structure, so that the sealing is more reliable.

6. And (5) antifouling design. A filter screen is arranged at a pressure sensing port where the safety valve is directly communicated with the cargo hold, so that foreign matters can be prevented from entering an inner cavity of a product while pressure is sensed.