Refueling electromagnetic valve for aircraft fuel system

Abstract

The utility model provides a refueling solenoid valve for an aircraft fuel system, which comprises a valve core, a solenoid valve shell, a solenoid valve core, a solenoid valve core, a solenoid valve core and a solenoid valve core, and is characterized in that the valve core is movably arranged in an inner cavity of the solenoid valve shell; the movable iron core is connected to the valve element and drives the valve element to move along the axis; the coil surrounds the movable iron core; the override device is provided with an operation assembly, the operation assembly is provided with a first joint part, and the first joint part is arranged to be operably jointed with and separated from a second joint part associated with the valve element; the operating assembly has a first state and a second state, when the operating assembly is in the first state and the first joint part is jointed with the second joint part, the operating assembly can drive the valve element to move along the axis, and when the operating assembly is in the second state, the first joint part is disengaged from the second joint part, and the operating assembly is disengaged from the movable iron core. By the adoption of the oiling electromagnetic valve, oiling control can still be conducted in a manual mode when an internal coil of the oiling electromagnetic valve is burnt out or power supply of the electromagnetic valve is abnormal.

Description

Technical Field

[0001] The utility model generally relates to the technical field of fuel system equipment of civil aircraft, and in particular to a refueling solenoid valve used in an aircraft fuel system. Background Art

[0002] The existing civil aircraft refueling system uses a refueling solenoid valve for control. The relevant typical refueling system forms are as follows: Figure 3 shown.

[0003] When the aircraft begins pressure refueling, the fuel measurement system in the aircraft controls the refueling solenoid valve 1 to be energized. After energization, the valve core of the refueling solenoid valve 1 retracts to overcome the spring force inside the solenoid valve 1 to allow the flow of fuel and air. At this time, when the fuel reaches the fuel inlet of the refueling solenoid valve 1 through the refueling pipeline, the refueling pressure is greater than the spring force applied by the return spring 4 on the pilot valve 2. At this time, the return spring 4 is compressed, and the fuel pushes the pilot valve 2 to reach the fuel outlet, among which a small part of the fuel enters the plunger guide 5 and its chamber through the restrictor 3 and reaches the solenoid valve 1. Since the solenoid valve 1 is in an open state, the fuel reaching the solenoid valve 1 will be directly discharged into the fuel tank (not shown).

[0004] When the target fuel volume is reached, the fuel measurement system controls the fueling solenoid valve 1 to cut off the power. After the power is cut off, the valve core of the fueling solenoid valve 1 extends under the action of the spring force inside the solenoid valve, and the fuel and air are no longer allowed to flow. At this time, the fuel in the chamber where the plunger guide 5 of the solenoid valve is located cannot be discharged to the fuel tank, the pressure in the chamber where the plunger guide is located rises, and the guide valve 2 returns to the closed state under the action of the return spring 4. The fuel cannot reach the fuel outlet, and the refueling stops.

[0005] The existing refueling solenoid valve 1 is actuated by energizing the internal coil of the solenoid valve 1 to generate suction on the internal moving iron core, thereby driving the valve core of the solenoid valve 1 to move. However, once the internal coil of the solenoid valve 1 burns out or the refueling and draining control panel fails, causing the power supply of the solenoid valve 1 to become abnormal, it will not be able to actuate, ultimately resulting in the inability to refuel or the inability to cut off refueling, which affects the normal route operation.

[0006] Therefore, it is hoped to provide a refueling solenoid valve for an aircraft fuel system, which can still control the opening and closing of the solenoid valve when the internal coil of the solenoid valve burns out or the power supply of the solenoid valve is abnormal. Utility Model Content

[0007] To overcome the deficiencies of the prior art, the utility model provides a refueling solenoid valve for an aircraft fuel system, comprising: a solenoid valve housing; a valve core, the valve core being movably arranged in an inner cavity of the solenoid valve housing; a moving iron core, the moving iron core being connected to the valve core and driving the valve core to move along an axis; and a coil, the coil surrounding the moving iron core; wherein the refueling solenoid valve also includes an override device, the override device having an operating component, the operating component being provided with a first engaging portion, the first engaging portion being configured to be operably engaged and disengaged with a second engaging portion associated with the valve core; the operating component having a first state and a second state, when the operating component is in the first state, the first engaging portion is engaged with the second engaging portion, the operating component can drive the valve core to move along the axis, and when the operating component is in the second state, the first engaging portion is disengaged from the second engaging portion, and the operating component is disengaged from the moving iron core.

[0008] According to another aspect of the present invention, the first engaging portion includes a gear, and the second engaging portion includes a rack.

[0009] According to another aspect of the utility model, the operating component includes: a connecting rod, one end of which is provided with the first engaging portion and extends into the interior of the solenoid valve housing, and the other end of the connecting rod protrudes out of the outer surface of the solenoid valve housing; an operating knob, which is attached to the other end of the connecting rod; and a return spring, which is arranged to provide an elastic force to disengage the first engaging portion from the second engaging portion, and when the first engaging portion is engaged with the second engaging portion, the rotation of the operating knob drives the movement of the valve core.

[0010] According to another aspect of the utility model, the operating assembly further comprises a fixing sleeve, the fixing sleeve is sleeved on the connecting rod, and the return spring is installed between the fixing sleeve and the operating knob.

[0011] According to another aspect of the utility model, the connecting rod is further provided with a limiting flange for limiting the moving position of the connecting rod, the limiting flange is arranged between the first joint portion and the fixing sleeve, and the limiting flange is formed integrally with the connecting rod.

[0012] According to another aspect of the utility model, the housing includes: a valve body, the valve body is provided with a valve seat that can abut against the valve core and form a valve cavity for the valve core to move; a coil cover, the coil cover is arranged to surround the coil; and a joint part, one end of the joint part is attached to the valve body, and the other end of the joint part is attached to the coil cover; wherein the operating component of the override device is arranged through a through hole formed on the joint part.

[0013] According to another aspect of the present invention, the moving iron core includes a first part and a second part, wherein the first part is configured to be attached to the valve core, the second part is surrounded by the coil, and the second joint is arranged on the first part of the moving iron core.

[0014] According to another aspect of the utility model, the first part and the second part of the moving iron core are formed integrally, and a part of the valve core is embedded in the first part.

[0015] According to another aspect of the present invention, the second engaging portion is integrally formed on the outer surface of the moving iron core.

[0016] According to another aspect of the utility model, the solenoid valve housing is provided with a through hole, and the operating component is arranged in the through hole. When the operating component is in the first state, the first engaging portion protrudes from the through hole and extends into the inner cavity of the solenoid valve housing. When the operating component is in the second state, the first engaging portion retracts into the through hole.

[0017] By adopting the refueling solenoid valve according to the utility model, when the internal coil of the refueling solenoid valve is burned out or the power supply of the solenoid valve is abnormal, refueling control can still be performed manually. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A cutaway perspective view of a refueling solenoid valve for an aircraft fuel system according to the present invention is shown, wherein the override device is in a disengaged position.

[0020] Figure 2 A cutaway perspective view of a refueling solenoid valve for an aircraft fuel system according to the present invention is shown, wherein the override device is in an engaged position.

[0021] Figure 3 A schematic diagram of the structure of an aircraft fuel system is shown.

[0022] Reference numerals list

[0023] 100 refueling solenoid valve

[0024] 11 Valve body

[0025] 12 Coil cover

[0026] 13 Joint

[0027] 21 coils

[0028] 22 fixed core

[0029] 23Electrical connector

[0030] 26 Moving iron core

[0031] 261 Part 1

[0032] 262 Part 2

[0033] 265 Rack

[0034] 27 Coil seat

[0035] 30 Operational components

[0036] 31 Connecting rod

[0037] 311 Gear

[0038] 312 limit flange

[0039] 32 operation knobs

[0040] 33 Return spring

[0041] 34 Sealing gasket

[0042] 35 fixed sleeve

[0043] 36 latches

[0044] 51 valve core

[0045] 52 valve core spring

[0046] 53 Spring base DETAILED DESCRIPTION

[0047] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0048] Figure 1 and Figure 2 The utility model shows a refueling solenoid valve 100 for an aircraft fuel system. The refueling solenoid valve 100 includes a hollow solenoid valve housing. The interior of the solenoid valve housing is mainly provided with a valve assembly and an electromagnetic actuator. The valve assembly mainly includes a valve core 51 and a valve core spring 52, wherein the valve core 51 is actuated by the electromagnetic actuator so that the valve core 51 can resist the force of the spring 52 and move toward the open position along the axis A, and when the electromagnetic actuator is not activated, the valve core 51 moves toward the closed position under the elastic force of the spring 52.

[0049] Specifically, the solenoid valve housing includes a valve body 11, which forms a valve cavity for the valve core 51 to move and a valve seat suitable for being abutted by the valve core 51. When the valve core 51 abuts against the valve seat, the valve port of the valve body 11 is closed, and when the valve core 51 leaves the valve seat, the valve port will open.

[0050] In addition, a valve core spring 52 is provided in the valve cavity formed by the valve body 11, and the valve core spring 52 is arranged to provide elastic force for the valve core 51 to abut against the valve seat. Preferably, one end of the valve core spring 52 abuts against a step surface formed on the valve core 51, and the other end of the valve core spring 52 abuts against a spring base 53 installed at the other end of the valve body 11.

[0051] It should be understood that the arrangement of the valve core and the spring in the valve body may also be in other forms. For example, the other end of the valve core spring may also abut against a step surface formed on the inner surface of the valve body 11 .

[0052] On the other hand, the electromagnetic actuation device in the refueling solenoid valve 100 generally includes a coil 21, a fixed iron core 22 and a movable iron core 26. The coil 21 is wound and mounted on a coil seat 27, the interior of the coil seat 27 is a hollow portion, the fixed iron core 22 is mounted at one end of the hollow portion away from the valve core, and the movable iron core 26 is connected to the valve core 51 and movably arranged in the hollow portion of the coil seat 27, and is at least partially surrounded by the coil 21. Corresponding to the electromagnetic actuation device, the solenoid valve housing includes a coil cover 12, which surrounds the entire coil 21 from the outside. In addition, an electrical connector 23 is installed at one end of the coil cover 12 away from the valve core 51 for supplying power to the refueling solenoid valve 100.

[0053] In a preferred embodiment, the moving iron core 26 is disposed inside the solenoid valve 100 between the base 53 and the fixed iron core 22. The base 53 is provided with a channel extending along the axis A, through which the valve core 51 extends, and a section of the valve core extending from the channel toward the electromagnetic actuator is embeddedly connected to the moving iron core 26. Accordingly, the moving iron core 26 includes a first portion 261 and a second portion 262, which are generally formed integrally. The first portion 261 of the moving iron core 26 refers to a portion of the moving iron core configured to be attached to the valve core 51, and the first portion 261 has an inner through hole extending along the axis A. The second portion 262 of the moving iron core 26 is substantially surrounded by the coil 21.

[0054] Roughly corresponding to the position where the moving iron core 26 and the valve core 51 are connected to each other, that is, roughly corresponding to the first part 261 of the moving iron core 26, the solenoid valve housing also includes a joint part 13, one end of the joint part 13 close to the valve seat is attached to the valve body 11, and the other end of the joint part 13 away from the valve seat is attached to the coil cover 12, so that the joint part 13 interconnects the valve body 11 and the coil cover 12 together.

[0055] In particular, according to the preferred embodiment of the utility model, the refueling solenoid valve 100 is provided with an override device. When the refueling solenoid valve 100 fails, such as the solenoid valve coil burns out, the 28V power supply is abnormal, etc., the override device can be manually controlled to open and close the refueling solenoid valve 100.

[0056] Specifically, the override device is provided with an operating assembly 30, the operating assembly 30 is provided with a first engaging portion, and the moving iron core 26 is provided with a second engaging portion that can engage with the first engaging portion. The operating assembly 30 has a first state and a second state. When the operating assembly 30 is in a state such as Figure 2 In the first state shown in FIG. 1 , the first engaging portion is engaged with the second engaging portion, and the operating assembly 30 can enable the moving iron core 26 to drive the valve core 51 to move along the axis A. When the operating assembly 30 is in the state shown in FIG. Figure 1 In the second state shown, the first engaging portion is disengaged from the second engaging portion, and the operating assembly 30 is correspondingly disconnected from the moving iron core 26 .

[0057] In a preferred embodiment, if Figure 1 and Figure 2 As shown, the operating assembly 30 is arranged through the through hole formed in the joint part 13. The operating assembly 30 mainly includes a connecting rod 31, an operating knob 32 and a return spring 33. One end of the connecting rod 31 extending to the inside of the joint part 13 is provided with a gear 311 as a first engagement portion, and correspondingly, a rack 265 as a second engagement portion suitable for engaging with the gear 311 is provided on the outer surface of the moving iron core 26. The other end of the connecting rod 31 protrudes out of the outer surface of the joint part 13. The operating knob 32 is attached to the end of the connecting rod 31 protruding out of the outer surface of the joint part 13. The return spring 33 is arranged to provide an elastic force to disengage the first engagement from the second engagement portion. Preferably, the return spring 33 is sleeved on the connecting rod 31, and the operating assembly further includes a fixing sleeve, which is sleeved on the connecting rod, one end of the return spring 33 abuts against one side surface of the operating knob 32, and the other end of the return spring 33 abuts against the opposite side surface of the fixing sleeve 35, and the fixing sleeve 35 is also at least partially received in the through hole of the joint part 13. In a preferred embodiment, the through hole is a stepped hole, and a sealing gasket 34 is further provided between the fixing sleeve 35 and the stepped surface of the through hole. In addition, the outer end of the connecting rod 31 further passes through the hole in the middle of the knob 32, and the latch 36 is inserted through the latch hole provided at the end of the connecting rod 31.

[0058] In a preferred embodiment, the connecting rod 31 in the operating assembly 30 can move in a direction perpendicular to the axis A. When the operating assembly 30 is in a first state, the return spring 33 is in a compressed state, and the gear 311 on the connecting rod 31 protrudes out of the through hole formed on the wall of the joint portion 13 and enters the inner cavity of the joint portion 13, thereby meshing with the rack 265 on the outer surface of the moving iron core 26; when the operating assembly 30 is in a second state, the return spring 33 is in a state of providing elastic force, so that the connecting rod 31 is radially biased outward in a direction perpendicular to the axis A, and the gear 311 on the connecting rod 31 is preferably retracted into the through hole.

[0059] In addition, a limiting flange 312 is provided at a position of the connecting rod 31 close to the gear 311. The limiting flange 312 is provided between the gear 311 and the fixing sleeve 35. When the operating assembly is in the second state, as shown in FIG. Figure 1 As shown, the limiting flange 312 abuts against the sealing gasket 34 on the end surface of the fixing sleeve 35, thereby limiting the position of the connecting rod 31 moving out of the through hole.

[0060] In a preferred embodiment, the gear 311 and the limiting flange 312 are integrally formed with the connecting rod 31, but in other alternative embodiments, the gear 311 may be fixed to the connecting rod 31 by a fixing member, and the limiting flange 312 may be arranged at other positions for limiting the movement of the connecting rod 31, such as on the inner surface of the through hole.

[0061] Now combined Figure 1 ― Figure 2 The operation of the refueling solenoid valve 100 according to the present invention is described.

[0062] When the aircraft is refueling under normal pressure, the override device in the refueling solenoid valve 100 of the present invention is in the following state: Figure 1 The second state shown, that is, the gear 311 of the connecting rod 31 is disengaged from the rack 265 on the moving iron core 26, and the gear 311 retracts into the through hole of the joint part 13, so that the override device and the moving iron core 26 are disengaged from each other, and the conventional pressure refueling of the aircraft is controlled by the electromagnetic actuator of the solenoid valve.

[0063] When the refueling solenoid valve 100 fails, for example, the coil of the solenoid valve burns out, or there is an abnormality in the power supply to the refueling solenoid valve 100, the operator can manually press the knob 32 to compress the return spring 33 between the fixed sleeve 35 and the knob 32, so that the connecting rod 31 moves toward the moving iron core 26 until the gear 311 at the end of the connecting rod 31 engages with the rack 265 on the moving iron core 26, so that the moving iron core 26 can move along the axis A as the knob 32 rotates. At this time, rotating the knob 32 can manually control the position of the moving iron core 26, thereby controlling the opening and closing of the refueling solenoid valve 100.

[0064] In a preferred embodiment according to the present invention, the housing of the refueling solenoid valve 100 is considered to be composed of three parts. It should be understood that in other alternative embodiments, the housing of the refueling solenoid valve 100 can also be formed in one piece, or formed of two parts.

[0065] The second engagement portion for engaging the first engagement portion of the override device needs to be associated with the valve core. In a preferred embodiment according to the present invention, the rack 265 is integrally formed on the outer surface of the moving iron core, and the moving iron core is directly connected to the valve core, whereby the rack 265 is associated with the valve core 21, but it should be understood that the second engagement portion can be associated with the valve core in other ways, for example, the rack can also be independently formed, and the rack can be installed to the moving iron core by suitable installation means, and the moving iron core is connected to the valve core; or, in other alternative embodiments, the rack can be directly formed on the outer surface of a part of the valve core.

[0066] In a preferred embodiment of the present invention, the first engaging portion and the second engaging portion are a gear and a rack respectively, but it should be understood that they may also be replaced by a cam mechanism that cooperates with each other.

[0067] By adopting the refueling solenoid valve according to the utility model, when the internal coil of the refueling solenoid valve is burned out or the power supply of the solenoid valve is abnormal, refueling control can still be performed manually.

[0068] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A refueling solenoid valve for an aircraft fuel system, comprising: Solenoid valve housing; A valve core, the valve core is movably arranged in the inner cavity of the solenoid valve housing; a moving iron core connected to the valve core and driving the valve core to move along an axis; and a coil, the coil surrounding the moving iron core; It is characterized in that The refueling solenoid valve further includes an override device having an operating assembly, wherein the operating assembly is provided with a first engaging portion, wherein the first engaging portion is configured to operably engage with and disengage from a second engaging portion associated with the valve core; The operating component has a first state and a second state, When the operating assembly is in the first state, when the first engaging portion is engaged with the second engaging portion, the operating assembly can drive the valve core to move along the axis. When the operating assembly is in the second state, the first engaging portion is disengaged from the second engaging portion, and the operating assembly is disengaged from the moving iron core.

2. The refueling solenoid valve according to claim 1, characterized in that: The first engaging portion includes a gear and the second engaging portion includes a rack.

3. The refueling solenoid valve according to claim 1 or 2, characterized in that: The operating components include: a connecting rod, one end of which is provided with the first engaging portion and extends into the interior of the solenoid valve housing, and the other end of which protrudes out of the outer surface of the solenoid valve housing; an operating knob attached to the other end of the connecting rod; a return spring arranged to provide an elastic force to disengage the first engaging portion from the second engaging portion, When the first engagement portion is engaged with the second engagement portion, rotation of the operation knob drives movement of the valve core.

4. The refueling solenoid valve according to claim 3, characterized in that: The operating assembly further comprises a fixing sleeve, wherein the fixing sleeve is sleeved on the connecting rod, and the return spring is installed between the fixing sleeve and the operating knob.

5. The refueling solenoid valve according to claim 4, characterized in that: The connecting rod is further provided with a limiting flange for limiting the moving position of the connecting rod, and the limiting flange is arranged between the first joint portion and the fixing sleeve. The limiting flange is formed integrally with the connecting rod.

6. The refueling solenoid valve according to claim 1, characterized in that: The housing comprises: A valve body, wherein the valve body is provided with a valve seat capable of abutting against the valve core and forming a valve cavity for the valve core to move; a coil cover arranged to surround the coil; and a joint portion, one end of which is attached to the valve body and the other end of which is attached to the coil cover; Wherein, the operating component of the override device is arranged through a through hole formed on the joint part.

7. The refueling solenoid valve according to claim 1, characterized in that: The moving iron core includes a first portion and a second portion, wherein the first portion is configured to be attached to the valve core, and the second portion is surrounded by the coil. Wherein, the second joint portion is arranged on the first part of the moving iron core.

8. The refueling solenoid valve according to claim 7, characterized in that: The first part and the second part of the moving iron core are formed integrally, and a part of the valve core is embedded in the first part.

9. The refueling solenoid valve according to claim 1, characterized in that: The second engaging portion is integrally formed on the outer surface of the moving iron core.

10. The refueling solenoid valve according to claim 1, characterized in that: The solenoid valve housing is provided with a through hole, and the operating component is arranged in the through hole. When the operating component is in the first state, the first engaging portion protrudes from the through hole and extends into the inner cavity of the solenoid valve housing. When the operating component is in the second state, the first engaging portion retracts into the through hole.

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