Electric fuel supply system with controllable starting oil way

Abstract

The invention discloses an electric fuel supply system with a controllable starting oil way, relates to the technical field of aero-engine fuel flow control, and is mainly used for solving the problem that an existing starting oil way needs to be closed through manual control. According to the main structure, the starting oil way control valve is included, a control valve oil inlet connected with an oil outlet of a fuel pump is formed in the starting oil way control valve, and a starting oil way oil outlet which can be automatically closed when the oil pressure reaches a preset value and can only be reopened through a reset assembly is further formed in the starting oil way control valve; and the oil inlet of the starting oil path nozzle is only connected with the oil outlet of the starting oil path. According to the electric fuel oil supply system with the controllable starting oil way, the starting oil way can be automatically closed when the oil pressure reaches the preset value, reopening caused by follow-up oil pressure changes is avoided, and therefore the operation that the starting oil way is closed through manual control is avoided, and automation of the fuel oil supply system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine fuel flow control, and in particular to an electric fuel supply system with a controllable starting oil circuit. Background Art

[0002] The aviation electric fuel pump is the core power component of the aircraft engine. Its function is to provide the actuator with fuel with a certain pressure and flow. Compared with the traditional aviation fuel pump, the existence of the electric fuel pump can minimize the oil return to the greatest extent, greatly reduce the complexity of the fuel control system, and improve the reliability of the engine.

[0003] In the existing electric fuel pump technology for aircraft engines, the entire fuel supply system is mainly composed of a servo motor a, a fuel pump b, an electromagnetic overflow valve c, a return oil damper d, a boost valve e, a main oil circuit nozzle f, and a starting oil circuit nozzle g. Figure 1 As shown, the drive controller is connected to the servo motor a, the servo motor a is connected to the input shaft of the fuel pump b, the fuel inlet of the fuel pump b is connected to the fuel tank, the fuel outlet of the fuel pump b is connected to the fuel inlet of the boost valve e, the oil circuit between the fuel pump b outlet and the boost valve e inlet is also respectively connected to the electromagnetic overflow valve c inlet and the starting oil circuit nozzle g inlet, the electromagnetic overflow valve c outlet is connected to the fuel tank, the boost valve e outlet is connected to the main oil circuit nozzle f inlet, and the boost valve e oil return port is connected to the electromagnetic overflow valve c outlet through the return oil damper d.

[0004] The fuel supply system is used on turbojet engines to supply the fuel required for the engine to work in various states. When the engine is started, two lines supply fuel at the same time. After starting, only the main oil line is supplied with fuel to ensure that the engine works normally and stably under given conditions.

[0005] The fuel supply system includes a starting oil circuit and a main oil circuit, wherein the flow resistance of the main oil circuit is lower than that of the starting oil circuit. During the engine starting stage, there is a certain flow distribution relationship between the main oil circuit and the starting oil circuit. Generally, a boost valve 5e is set in the main oil circuit to meet the above flow distribution relationship. After the starting is completed, the starting oil circuit is closed and only the main oil circuit is supplied with oil.

[0006] However, in the prior art, the starting oil circuit needs to be closed by manual control, which cannot meet the system automation requirements and affects work efficiency. Summary of the invention

[0007] The purpose of the present invention is to provide an electric fuel supply system with a controllable starting oil circuit, which can automatically close the starting oil circuit when the oil pressure reaches a preset value and will not be reopened due to subsequent changes in the oil pressure, thereby avoiding the operation of manually controlling the closing of the starting oil circuit and improving the automation of the fuel supply system.

[0008] The technical solution of the present invention to solve the above technical problems is: an electric fuel supply system with a controllable starting oil circuit, including a servo motor, a fuel pump, a pilot electromagnetic overflow valve, an oil return damping, a boost valve, a main oil circuit nozzle and a starting oil circuit nozzle, and also including a starting oil circuit control valve, the starting oil circuit control valve is provided with a control valve oil inlet connected to the fuel pump oil outlet, the starting oil circuit control valve is also provided with a starting oil circuit oil outlet that can automatically close when the oil pressure reaches a preset value and can only be reopened by a reset component, and the starting oil circuit nozzle oil inlet is only connected to the starting oil circuit oil outlet.

[0009] As a further improvement of the present invention, the starting oil circuit control valve includes a valve seat with a valve cavity therein, a valve core is provided in the valve seat which cooperates with the valve core with a clearance and can move axially reciprocatingly, a main spring is provided between one end of the valve core and the inner wall of the valve seat, the main spring is arranged axially along the valve core and both ends of the main spring are respectively connected to the valve core and the valve seat.

[0010] As a further improvement of the present invention, the outer wall of the valve core is provided with two annular sealing parts which are arranged around its axis and cooperate with the inner wall of the valve cavity for sliding sealing. The control valve oil inlet and the starting oil circuit oil outlet are both arranged on the side wall of the valve seat between the two annular sealing parts, and the control valve oil inlet is arranged on the side of the starting oil circuit oil outlet close to the main spring.

[0011] As a further improvement of the present invention, an oil guide channel is provided along the axial direction of the valve core, and a push rod is coaxially provided in the oil guide channel and is clearance-matched with the valve core. The end of the push rod close to the main spring is provided with a plug that can support the valve core and slide and seal with the side wall of the oil guide channel. The side wall of the oil guide channel on the side of the plug away from the main spring is provided with an oil hole on the surface of the valve core, and the end of the push rod away from the main spring passes through the valve seat and is transmission-connected to a reset assembly that can drive the push rod to move toward the main spring side.

[0012] As a further improvement of the present invention, the inner diameter of the starting oil circuit outlet is the same as the inner diameter of the oil hole on the valve core surface, and the straight-line distance between the annular sealing portion arranged away from the main spring and the starting oil circuit outlet is equal to the straight-line distance between the plug and the oil hole on the valve core surface.

[0013] As a further improvement of the present invention, the oil inlet of the control valve is also connected to the oil inlet of the pilot electromagnetic overflow valve.

[0014] As a further improvement of the present invention, the reset assembly includes a coil housing installed on the valve seat, the coil housing is provided with an installation cavity extending in the same direction as the push rod, the installation cavity is provided with an armature that can move toward the main spring side and is connected to the push rod, and the coil housing is also provided with an electromagnetic coil arranged around the armature.

[0015] As a further improvement of the present invention, an armature spring sleeved on the outside of the push rod is provided between the end of the armature close to the main spring and the valve seat, and the two ends of the armature spring are respectively connected to the armature and the valve seat.

[0016] As a further improvement of the present invention, a main oil circuit outlet is also provided on the valve seat side wall between the two annular sealing parts, and the main oil circuit outlet is arranged on the side of the control valve oil inlet close to the main spring, and the boost valve oil inlet is connected to the main oil circuit outlet.

[0017] As a further improvement of the present invention, a side wall of the valve seat for mounting the main spring is provided with an oil drain port connected to the oil tank.

[0018] Beneficial Effects

[0019] Compared with the prior art, the advantages of the electric fuel supply system with controllable starting oil circuit of the present invention are:

[0020] 1. The electric fuel supply system is equipped with a starting oil circuit control valve on the starting oil circuit. When the oil pressure at the oil inlet of the control valve reaches a certain preset value, the starting oil circuit outlet of the starting oil circuit control valve will be automatically closed, thereby realizing the automatic closing of the starting oil circuit. After that, no matter how the oil pressure at the oil inlet of the control valve changes and fluctuates, the starting oil circuit outlet will remain closed and can only be reopened by a reset component. Through the starting oil circuit control valve, the electric fuel supply system can realize the automatic closing function of the starting oil circuit after starting is completed, thereby avoiding the cumbersome operation caused by manually controlling the closing of the starting oil circuit, thereby improving the automation of the fuel supply system.

[0021] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A hydraulic principle diagram of an electric fuel supply system of the prior art;

[0024] Figure 2 It is a hydraulic principle diagram of the electric fuel supply system of the present invention;

[0025] Figure 3 It is a schematic diagram of the structural cross-section of the starting oil circuit control valve in the present invention.

[0026] Among them: 1-servo motor; 2-fuel pump; 3-pilot electromagnetic overflow valve; 4-return oil damping; 5-boost valve; 6-main oil circuit nozzle; 7-starting oil circuit nozzle; 8-starting oil circuit control valve; 9-fuel tank. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] Example

[0031] The specific embodiments of the present invention are as follows Figure 2-3 As shown, an electric fuel supply system with controllable starting oil circuit includes a servo motor 1, a fuel pump 2, a pilot electromagnetic overflow valve 3, an oil return damper 4, a boost valve 5, a main oil circuit nozzle 6 and a starting oil circuit nozzle 7. The servo motor 1 is connected to the drive controller and the input shaft of the fuel pump 2, and the electric control on / off of the fuel pump 2 is realized by the drive controller and the servo motor 1. At the same time, the oil inlet of the fuel pump 2 is connected to the fuel tank 9, the oil outlet of the fuel pump 2b is connected to the oil inlet of the boost valve 5e, the oil outlet of the boost valve 5 is connected to the oil inlet of the main oil circuit nozzle 6, the oil return port of the boost valve 5 is connected to the oil outlet of the electromagnetic overflow valve 3 through the oil return damper 4, and the oil outlet of the pilot electromagnetic overflow valve 3 is connected to the fuel tank 9.

[0032] In addition, the electric fuel supply system of the present invention further includes a starting oil circuit control valve 8. The starting oil circuit control valve 8 is provided with a control valve oil inlet 811 connected to the oil outlet of the fuel pump 2. The starting oil circuit control valve 8 is also provided with a starting oil circuit oil outlet 813 that can be automatically closed when the oil pressure reaches a preset value and can only be reopened by a reset component, and the oil inlet of the starting oil circuit nozzle 7 is only connected to the starting oil circuit oil outlet 813. In this embodiment, the control valve oil inlet 811 is also connected to the oil inlet of the pilot electromagnetic relief valve 3.

[0033] When the electric fuel supply system is started, the oil enters the starting oil circuit through the starting oil circuit control valve 8. When the oil pressure of the control valve oil inlet 811 reaches a certain preset value, the starting oil circuit outlet 813 of the starting oil circuit control valve 8 will be automatically closed, thereby realizing the automatic closing of the starting oil circuit. After that, no matter how the oil pressure of the control valve oil inlet 811 changes and fluctuates, the starting oil circuit outlet 813 will remain closed and can only be reopened by the reset component. Therefore, through the starting oil circuit control valve 8, the electric fuel supply system can realize the automatic closing function of the starting oil circuit after the starting is completed, thereby avoiding the cumbersome operation caused by manually controlling the closing of the starting oil circuit, thereby improving the automation of the fuel supply system.

[0034] Regarding the specific structure of the starting oil circuit control valve 8, as shown in FIG. Figure 3 As shown: the starting oil circuit control valve 8 includes a valve seat 81 with a valve cavity therein, and a valve core 82 is provided in the valve seat 81, which is in clearance with the valve core 82 and can reciprocate axially. A main spring 814 is provided between one end of the valve core 82 and the inner wall of the valve seat 81, and the main spring 814 is arranged along the axial direction of the valve core 82, and the two ends of the main spring 814 are respectively connected to the valve core 82 and the valve seat 81. Two annular sealing parts 823 are arranged around the axis of the valve core 82 and are in sliding sealing cooperation with the inner wall of the valve cavity. The control valve oil inlet 811 and the starting oil circuit oil outlet 813 are both arranged on the side wall of the valve seat 81 between the two annular sealing parts 823, and the control valve oil inlet 811 is arranged on the side of the starting oil circuit oil outlet 813 close to the main spring 814.

[0035] An oil guide channel 822 is provided in the valve core 82 along its axial direction, and a push rod 83 is coaxially provided in the oil guide channel 822 to match the clearance therewith. A plug 831 is provided at one end of the push rod 83 close to the main spring 814, which can support the valve core 82 and slide and seal with the side wall of the oil guide channel 822. An oil hole 821 on the surface of the valve core is provided on the side wall of the oil guide channel 822 away from the main spring 814. An end of the push rod 83 away from the main spring 814 passes through the valve seat 81 and is transmission-connected with a reset assembly that can drive the push rod 83 to move toward the main spring 814. The inner diameter of the starting oil circuit oil outlet 813 is the same as the inner diameter of the oil hole 821 on the surface of the valve core, and the straight-line distance between the annular sealing portion 823 set away from the main spring 814 and the starting oil circuit oil outlet 813 is equal to the straight-line distance between the plug 831 and the oil hole 821 on the surface of the valve core.

[0036] In this embodiment, a main oil circuit oil outlet 812 is also provided on the side wall of the valve seat 81 between the two annular sealing parts 823, and the main oil circuit oil outlet 812 is arranged on the side of the control valve oil inlet 811 close to the main spring 814, and the oil inlet of the boosting valve 5 is connected to the main oil circuit oil outlet 812. That is, the oil outlet of the fuel pump 2b and the oil inlet of the boosting valve 5e in this embodiment are not directly connected, but indirectly connected - the oil output from the oil outlet of the fuel pump 2 passes through the control valve oil inlet 811 on the starting oil circuit control valve 8, the main oil circuit oil outlet 812 and the oil inlet of the boosting valve 5e in turn, and is then delivered to the boosting valve 5e. In addition, the side wall of the valve seat 81 for installing the main spring 814 is provided with an oil drain port connected to the fuel tank 9.

[0037] In addition, regarding the specific structure of the reset assembly, the reset assembly includes a coil housing 84 installed on the valve seat 81. The coil housing 84 is provided with a mounting cavity extending in the same direction as the push rod 83, and the mounting cavity is provided with an armature 841 that can move toward the main spring 814 and is connected to the push rod 83. The coil housing 84 is also provided with an electromagnetic coil 843 arranged around the armature 841. In this embodiment, an armature spring 842 sleeved on the outside of the push rod 83 is provided between one end of the armature 841 close to the main spring 814 and the valve seat 81, and the two ends of the armature spring 842 are respectively connected to the armature 841 and the valve seat 81.

[0038] The working principle of the electric fuel supply system is as follows:

[0039] First, the servo motor 1 receives the instruction from the controller and drives the fuel pump 2 to rotate synchronously. The inlet of the fuel pump 2 sucks the fuel in the fuel tank 9 and outputs it to the outlet of the fuel pump 2.

[0040] Then, the electric fuel supply system enters the starting stage, the starting oil circuit control valve 8 is in the initial state, the starting oil circuit oil outlet 813 and the oil hole 821 on the valve core surface are in the open state. At this time, the oil in the starting oil circuit control valve 8 is output to the oil inlet of the boost valve 5 through the main oil circuit oil outlet 812, and is output to the main oil circuit nozzle 6 through the boost valve 5 oil outlet. At the same time, the oil in the starting oil circuit control valve 8 is also output to the starting oil circuit nozzle 7 through the starting oil circuit oil outlet 813, thereby realizing the simultaneous oil supply of the main oil circuit and the starting oil circuit. Afterwards, the oil returns to the oil tank 9 through the return oil port of the boost valve 5 and the return oil damper 4. The pilot electromagnetic overflow valve 3 serves as a safety valve, and the return oil damper 4 can make the boost valve have good dynamic characteristics.

[0041] After that, after the engine is started, the starting phase of the electric fuel supply system ends. As the pressure of the main oil circuit increases, the oil enters the oil hole 821 on the valve core surface of the starting oil circuit control valve 8, and enters the lower cavity of the valve core 82 through the oil guide channel 822 inside the valve core 82, and overcomes the preload force of the main spring 814, pushing the valve core 82 to move toward the main spring 814. When the pressure of the main oil circuit reaches a certain value, the valve core 82 drives the oil hole 821 on the valve core surface to move to the plug 831 at the end of the push rod 83, thereby blocking the oil hole 821 on the valve core surface. At the same time, the annular sealing portion 823 on the side of the valve core 82 away from the main spring 814 or blocks the starting oil circuit oil outlet 813, thereby closing the starting oil circuit and only supplying oil to the main oil circuit. At this time, the oil in the lower chamber of the valve core 82 forms a closed volume, in which the pressure of the oil is balanced with the preload force of the main spring 814. No matter how the pressure of the main oil circuit changes, the valve core 82 will maintain its position, thereby achieving the closure and locking of the starting oil circuit.

[0042] Finally, when the electric fuel supply system is finished working, the electromagnetic coil 843 is energized, so that the armature 841 overcomes the preload force of the armature spring 842 and moves toward the main spring 814, thereby pushing the push rod 83 to move toward the main spring 814. At this time, the blocked oil hole 821 on the valve core surface is reopened, and under the action of the main spring 814, the oil in the lower cavity of the valve core 82 flows out from the oil hole 821 on the valve core surface. At the same time, the pilot electromagnetic overflow valve 3 is energized, and the electromagnetic overflow valve 3 acts as a load relief valve, and the oil can return to the oil tank 9 through the pilot electromagnetic overflow valve 3. Then the valve core 82 starts to reset and move, and at the same time, the electromagnetic coil 843 is de-energized, and the armature 841 also starts to reset and move under the action of the armature spring 842, so that the control valve returns to the initial state, realizing the reset of the starting oil circuit control valve.

[0043] In this system, the starting oil circuit control valve 8 plays two important roles: first, when the main oil circuit pressure reaches the set value, the starting oil circuit outlet 813 closes automatically; second, when the starting oil circuit outlet 813 is closed, its valve core 82 is locked, and the position of the valve core 82 is no longer affected by the main oil circuit pressure until the electromagnetic coil 843 is turned on to reset.

[0044] The present invention is described above in conjunction with the best embodiment, but the present invention is not limited to the above disclosed embodiment, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. An electric fuel supply system with controllable starting oil circuit, comprising a servo motor (1), a fuel pump (2), a pilot electromagnetic overflow valve (3), an oil return damper (4), a boost valve (5), a main oil circuit nozzle (6) and a starting oil circuit nozzle (7), characterized in that: It also comprises a starting oil circuit control valve (8), the starting oil circuit control valve (8) being provided with a control valve oil inlet (811) connected to the oil outlet of the fuel pump (2), the starting oil circuit control valve (8) being provided with a starting oil circuit oil outlet (813) which can be automatically closed when the oil pressure reaches a preset value and can only be reopened by a reset component, and the oil inlet of the starting oil circuit nozzle (7) is only connected to the starting oil circuit oil outlet (813).

2. The electric fuel supply system with controllable starting oil circuit according to claim 1, characterized in that: The starting oil circuit control valve (8) comprises a valve seat (81) with a valve cavity therein, a valve core (82) is provided in the valve seat (81) and is clearance-matched with the valve core (81) and is capable of axial reciprocating movement, a main spring (814) is provided between one end of the valve core (82) and the inner wall of the valve seat (81), the main spring (814) is arranged axially along the valve core (82), and two ends of the main spring (814) are respectively connected to the valve core (82) and the valve seat (81).

3. The electric fuel supply system with controllable starting oil circuit according to claim 2, characterized in that: The outer wall of the valve core (82) is provided with two annular sealing portions (823) arranged around its axis and slidingly sealingly matched with the inner wall of the valve cavity. The control valve oil inlet (811) and the starting oil circuit oil outlet (813) are both arranged on the side wall of the valve seat (81) between the two annular sealing portions (823), and the control valve oil inlet (811) is arranged on the side of the starting oil circuit oil outlet (813) close to the main spring (814).

4. The electric fuel supply system with controllable starting oil circuit according to claim 3, characterized in that: An oil guide channel (822) is provided in the valve core (82) along its axial direction, and a push rod (83) is coaxially provided in the oil guide channel (822) and is clearance-matched therewith, and a plug (831) is provided at one end of the push rod (83) close to the main spring (814) and is capable of supporting the valve core (82) and slidingly sealingly matching with the side wall of the oil guide channel (822), and an oil hole (821) is provided on the surface of the valve core on the side of the oil guide channel (822) away from the main spring (814), and an end of the push rod (83) away from the main spring (814) passes through the valve seat (81) and is transmission-connected to a reset assembly capable of driving the push rod (83) to move toward the main spring (814).

5. The electric fuel supply system with controllable starting oil circuit according to claim 4, characterized in that: The inner diameter of the starting oil circuit oil outlet (813) is the same as the inner diameter of the oil hole (821) on the valve core surface, and the straight-line distance between the annular sealing portion (823) arranged away from the main spring (814) and the starting oil circuit oil outlet (813) is equal to the straight-line distance between the plug (831) and the oil hole (821) on the valve core surface.

6. The electric fuel supply system with controllable starting oil circuit according to claim 5, characterized in that: The control valve oil inlet (811) is also connected to the oil inlet of the pilot electromagnetic overflow valve (3).

7. The electric fuel supply system with controllable starting oil circuit according to claim 5 or 6, characterized in that: The reset assembly comprises a coil housing (84) mounted on a valve seat (81), wherein a mounting cavity extending in the same direction as the push rod (83) is provided in the coil housing (84), wherein an armature (841) capable of moving toward a main spring (814) and connected to the push rod (83) is provided in the mounting cavity, and an electromagnetic coil (843) arranged around the armature (841) is also provided in the coil housing (84).

8. The electric fuel supply system with controllable starting oil circuit according to claim 7, characterized in that: An armature spring (842) sleeved on the outside of the push rod (83) is provided between one end of the armature (841) close to the main spring (814) and the valve seat (81), and two ends of the armature spring (842) are respectively connected to the armature (841) and the valve seat (81).

9. The electric fuel supply system with controllable starting oil circuit according to any one of claims 3 to 6, characterized in that: A main oil circuit oil outlet (812) is also provided on the side wall of the valve seat (81) between the two annular sealing portions (823), and the main oil circuit oil outlet (812) is arranged on the side of the control valve oil inlet (811) close to the main spring (814), and the boost valve (5) oil inlet is connected to the main oil circuit oil outlet (812).

10. The electric fuel supply system with controllable starting oil circuit according to claim 9, characterized in that: The side wall of the valve seat (81) for mounting the main spring (814) is provided with an oil drain port connected to the oil tank (9).

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