Electric fuel oil adjusting device and method for auxiliary power device

Abstract

The invention discloses an electric fuel oil adjusting device and method for an auxiliary power device, and relates to the technical field of fuel oil adjusting. The invention relates to an electric fuel regulator of an auxiliary power device, which mainly comprises a direct current motor, a booster pump, an oil filter, a safety valve, a metering valve, a position sensor, a starting oil way electromagnetic valve, a main oil way electromagnetic valve and the like, is compact in structure, does not have the problem of temperature rise of return oil, can realize closed-loop flow control, and can effectively improve the working efficiency of a fuel system. And the functions of providing starting fuel oil and metering fuel oil are achieved, and parts of an auxiliary power device are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel regulation, and in particular relates to an electric fuel regulation device and method for an auxiliary power unit. Background Art

[0002] The fuel regulator is an important part of the fuel system of the aircraft auxiliary power unit (small aircraft engine). It is generally composed of a boost pump and a metering component. The boost pump has a constant speed, and the outlet flow is regulated by the metering component and the oil return component. The traditional fuel regulator needs to be linked with the auxiliary power unit. The boost pump speed cannot be adjusted. The metering valve and the oil return valve must be used to adjust the outlet fuel flow. The fuel regulator caused by the oil return will heat up significantly, resulting in power waste. In addition, the installation position is relatively fixed, which places high requirements on the product structure layout. The traditional fuel regulator also needs to work in conjunction with the fuel distributor to achieve the purpose of rapid and successful engine ignition. Summary of the invention

[0003] Based on the above background, the fuel regulator provided by the present invention does not require an auxiliary power unit reducer to provide power, and has the function of providing starting and metering fuel for the aircraft engine combustion chamber. It does not require a fuel distributor for fuel distribution, and has a compact structure and has both starting and metering functions.

[0004] In view of this, according to one aspect of an embodiment of the present invention, an electric fuel regulating device for an auxiliary power unit is provided, comprising: a DC motor 1, a boost pump 2, a starting oil circuit solenoid valve 6, a metering valve 7, and a main oil circuit solenoid valve 9; wherein the fuel flows through the inside of the DC motor 1 to cool it; the DC motor 1 is connected to the boost pump 2, and the boost pump 2 is used to pressurize the fuel; the starting oil circuit solenoid valve 6 and the metering valve 7 are connected in parallel to the oil outlet of the boost pump 2; the rear end of the starting oil circuit solenoid valve 6 is connected to the combustion chamber of the auxiliary power unit, and the metering valve 7 is used to meter the fuel flow; the metering valve 7 is connected in series with the main oil circuit solenoid valve 9, and the outlet of the main oil circuit solenoid valve 9 is connected to the combustion chamber of the auxiliary power unit.

[0005] Optionally, an oil filter 4 is also included, which is arranged at the outlet of the boost pump 2 and is used to filter fuel impurities.

[0006] Optionally, an oil filter blockage indicator 5 is also included to indicate whether the oil filter 4 is blocked.

[0007] Optionally, when the oil filter is clogged, the pressure difference before and after the oil filter clogging indicator 5 becomes larger, the valve core of the clogging indicator 5 is pushed and drives the micro switch to open, thereby realizing the two functions of fuel bypass outflow and indication alarm.

[0008] Optionally, a displacement sensor 8 is further included, wherein a displacement rod in the displacement sensor 8 is linked to the valve core of the metering valve 7 to convert the movement of the valve core into an electrical signal output.

[0009] Optionally, a safety valve 3 is also included, and both ends of the safety valve 3 are connected to the inlet and outlet of the boost pump 2 respectively. When the pressure behind the boost pump 2 reaches a threshold, the fuel pushes open the valve core of the safety valve 3 to allow the fuel to flow from the high-pressure area to the low-pressure area, that is, from the outlet of the boost pump 2 to the inlet.

[0010] According to another aspect of an embodiment of the present invention, an electric fuel regulation method for an auxiliary power unit is also provided, characterized in that any of the above-mentioned devices is used, including: controlling the DC motor 1 to a corresponding speed to drive the boost pump 2 to rotate, the fuel enters the boost pump 2 through the inside of the DC motor 1 and flows out after being pressurized, and the pressurized fuel is divided into two paths, one path enters the combustion chamber of the auxiliary power unit through the starting oil circuit solenoid valve 6 to start the auxiliary power unit; the other path of fuel enters the combustion chamber of the auxiliary power unit after passing through the metering valve 7 and the main oil circuit solenoid valve 9 to meter the auxiliary power unit.

[0011] Optionally, the auxiliary power unit is started and supplied with oil by controlling the opening and closing timing of the starting oil circuit solenoid valve 6 .

[0012] The electric fuel regulator is composed of a DC motor, a boost pump, an oil filter, a metering valve, a solenoid valve, etc. It has a compact structure and the installation position can be adjusted as needed. When working, the boost pump is driven by the DC motor to rotate, and the speed of the DC motor can be adjusted to provide starting fuel and metering fuel for the auxiliary power unit. After the auxiliary power unit is successfully started, the speed of the DC motor can be adjusted according to the feedback signal of the metering feedback module composed of the metering valve and the position sensor, so as to achieve closed-loop flow adjustment and maintain flow stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a fuel regulating device according to the present invention.

[0014] Description of reference numerals:

[0015] 1-DC motor, 2-boosting pump, 3-safety valve, 4-oil filter, 5-oil filter clogging indicator, 6-starting oil circuit solenoid valve, 7-metering valve, 8-position sensor, 9-main oil circuit solenoid valve. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] According to one aspect of an embodiment of the present invention, an electric fuel regulating device for an auxiliary power unit is provided, comprising: a DC motor 1, a boost pump 2, a starting oil circuit solenoid valve 6, a metering valve 7, and a main oil circuit solenoid valve 9; wherein the fuel flows through the inside of the DC motor 1 to cool it; the DC motor 1 is connected to the boost pump 2, and the boost pump 2 is used to boost the fuel; the starting oil circuit solenoid valve 6 and the metering valve 7 are connected in parallel to the oil outlet of the boost pump 2; the rear end of the starting oil circuit solenoid valve 6 is connected to the combustion chamber of the auxiliary power unit, and the metering valve 7 is used to meter the fuel flow; the metering valve 7 is connected in series with the main oil circuit solenoid valve 9, and the outlet of the main oil circuit solenoid valve 9 is connected to the combustion chamber of the auxiliary power unit. When working, the boost pump is driven to rotate by the DC motor, and the speed of the DC motor can be adjusted arbitrarily to provide starting fuel and metering fuel for the auxiliary power unit. After the auxiliary power unit is successfully started, the speed of the DC motor can be adjusted according to the feedback signal of the metering feedback module composed of the metering valve and the position sensor, and the flow closed-loop adjustment can be achieved to maintain the flow stability.

[0018] Furthermore, it also includes an oil filter 4, which is arranged at the outlet of the boost pump 2 and is used to filter fuel impurities.

[0019] Furthermore, an oil filter clogging indicator 5 is included to indicate whether the oil filter 4 is clogged.

[0020] Furthermore, when the oil filter is clogged, the pressure difference before and after the oil filter clogging indicator 5 becomes larger, the valve core of the clogging indicator 5 is pushed and drives the micro switch to open, thereby realizing the two functions of fuel bypass outflow and indication alarm.

[0021] Furthermore, a displacement sensor 8 is included, in which a displacement rod is linked to the valve core of the metering valve 7 to convert the movement of the valve core into an electrical signal output.

[0022] Furthermore, it also includes a safety valve 3, the two ends of which are respectively connected to the inlet and outlet of the boost pump 2. When the pressure behind the boost pump 2 reaches a threshold, the fuel pushes open the valve core of the safety valve 3 to allow the fuel to flow from the high-pressure area to the low-pressure area, that is, from the outlet of the boost pump 2 to the inlet.

[0023] According to another aspect of an embodiment of the present invention, an electric fuel regulation method for an auxiliary power unit is also provided, characterized in that any of the above-mentioned devices is used, including: controlling the DC motor 1 to a corresponding speed to drive the boost pump 2 to rotate, the fuel enters the boost pump 2 through the inside of the DC motor 1 and flows out after being pressurized, and the pressurized fuel is divided into two paths, one path enters the combustion chamber of the auxiliary power unit through the starting oil circuit solenoid valve 6 to start the auxiliary power unit; the other path of fuel enters the combustion chamber of the auxiliary power unit after passing through the metering valve 7 and the main oil circuit solenoid valve 9 to meter the auxiliary power unit.

[0024] Furthermore, by controlling the opening and closing timing of the starting oil circuit solenoid valve 6, the auxiliary power unit is started and supplied with oil.

[0025] Example

[0026] like Figure 1 As shown, the electric fuel regulator is mainly composed of a DC motor 1, a boost pump 2, a safety valve 3, an oil filter 4, an oil filter blockage indicator 5, a starting oil circuit solenoid valve 6, a metering valve 7, a displacement sensor 8, a main oil circuit solenoid valve 9, etc.

[0027] The DC motor 1 is mainly composed of a stator and a rotor. The fuel flows through the inside of the motor, which can cool the motor. The boost pump 2 is mainly composed of a centrifugal impeller, a centrifugal pump housing, a driving gear, a driven gear, a sliding bearing, a gear pump housing, etc. During operation, the fuel is first preliminarily pressurized by the rotating centrifugal pump, and then enters the gear pump for further pressurization. The centrifugal pump and the gear pump are coaxial and driven to rotate by the DC motor 1. The gear pump designs the number of gear teeth, module, tooth width, etc. according to the speed-flow relationship. The safety valve 3 is mainly composed of a valve sleeve, a conical valve core, a spring, etc. The valve core is sealed with a preload force provided by the spring to seal the valve sleeve oil hole. When the pressure after the boost pump reaches a certain value, the fuel pushes the valve core to make the fuel flow from the high-pressure area into the low-pressure area, thereby ensuring that the pressure after the pump is maintained below the safety value. The oil filter is mainly composed of a skeleton and a filter screen. The fuel enters from one side of the filter screen and flows out from the other side. During this period, impurities with a size larger than the filtering accuracy of the filter screen can be blocked. The oil filter blockage indicator 5 is mainly composed of a valve sleeve, a conical valve core, a spring, etc. The valve core is sealed with a preload force provided by the spring to seal the valve sleeve oil hole. When the pressure after the boost pump reaches a certain value, the fuel pushes the valve core to make the fuel flow from the high-pressure area into the low-pressure area, thereby ensuring that the pressure after the pump is maintained below the safety value. The oil filter 4 is composed of a sleeve, a valve core, a micro switch, etc., and its working principle is that when the oil filter 4 is blocked, the pressure difference before and after the oil filter blockage indicator 5 becomes larger, the valve core of the blockage indicator 5 is pushed and drives the micro switch to open, so as to realize the two functions of fuel bypass outflow and indication alarm; the starting oil circuit solenoid valve 6 is mainly composed of a housing, a coil, an armature, a spring, and an oil circuit baffle. When the power is off, the armature is at the bottom of the solenoid valve under the action of the spring force, and the baffle seals the oil circuit outlet. When the power is on, the armature moves up under the action of the electromagnetic force, and the baffle moves accordingly, exposing the oil circuit outlet, and the fuel flows out from the outlet; the metering valve 7 is mainly composed of a valve sleeve, a valve core, a spring, etc. When the fuel passes through the metering valve, the valve core is pushed to move to open the oil hole of the corresponding flow, and the fuel flow is proportional to the displacement of the valve core; the displacement sensor 8 is mainly composed of a housing, an input coil, an output coil, a displacement rod, etc., wherein the displacement rod is linked with the metering valve valve core, and the movement of the valve core can be converted into an electrical signal output.

[0028] The working principle of the electric fuel regulator is as follows: the controller controls the DC motor 1 to the corresponding speed, the motor 1 drives the boost pump 2 to rotate, the fuel enters the boost pump 2 through the inside of the motor 1 and flows out after being pressurized, and the pressurized fuel passes through the oil filter 4 and is divided into two paths. One path enters the combustion chamber of the auxiliary power unit through the starting oil circuit solenoid valve 6. By controlling the opening and closing timing of the starting oil circuit solenoid valve 6, the starting fuel supply of the auxiliary power unit can be achieved; the other path of fuel after the oil filter 4 enters the combustion chamber of the auxiliary power unit after passing through the metering valve 7 and the main oil circuit solenoid valve 9. The controller can calculate the real-time fuel flow rate through the position of the metering valve 7 fed back by the displacement sensor 8, and adjust the speed of the DC motor 1 as needed to increase and decrease the fuel flow rate, thereby stabilizing the operation of the position auxiliary power unit.

[0029] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An electric fuel regulating device for an auxiliary power unit, characterized in that: include: A DC motor (1), a boost pump (2), a starting oil circuit electromagnetic valve (6), a metering valve (7), and a main oil circuit electromagnetic valve (9); wherein the fuel flows through the DC motor (1) to cool it; the DC motor (1) is connected to the boost pump (2), and the boost pump (2) is used to boost the fuel; the starting oil circuit electromagnetic valve (6) and the metering valve (7) are connected in parallel to the oil outlet of the boost pump (2); the rear end of the starting oil circuit electromagnetic valve (6) is connected to the combustion chamber of the auxiliary power unit, and the metering valve (7) is used to meter the fuel flow; the metering valve (7) is connected in series with the main oil circuit electromagnetic valve (9), and the outlet of the main oil circuit electromagnetic valve (9) is connected to the combustion chamber of the auxiliary power unit.

2. The device according to claim 1, characterized in that It also includes an oil filter (4), which is arranged at the outlet of the boost pump (2) and is used to filter fuel impurities.

3. The device according to claim 2, characterized in that It also includes an oil filter blockage indicator (5) for indicating whether the oil filter (4) is blocked.

4. The device according to claim 3, characterized in that When the oil filter is clogged, the pressure difference before and after the oil filter clogging indicator (5) increases, the valve core of the clogging indicator (5) is pushed and drives the micro switch to open, thereby realizing the two functions of fuel bypass outflow and indication alarm.

5. The device according to claim 1, characterized in that It also comprises a displacement sensor (8), wherein a displacement rod in the displacement sensor (8) is linked with a valve core of a metering valve (7) to convert the movement of the valve core into an electrical signal output.

6. The device according to claim 1, characterized in that The invention also comprises a safety valve (3), the two ends of which are respectively connected to the inlet and outlet of the boosting pump (2). When the pressure behind the boosting pump (2) reaches a threshold value, the fuel pushes open the valve core of the safety valve (3) so that the fuel flows from the high-pressure area to the low-pressure area, that is, from the outlet of the boosting pump (2) to the inlet.

7. An electric fuel regulation method for an auxiliary power unit, characterized in that: Using any device as described in claims 1 to 6, comprising: controlling a DC motor (1) to a corresponding speed to drive a boost pump (2) to rotate, fuel oil entering the boost pump (2) through the DC motor (1) and flowing out after being pressurized, the pressurized fuel oil being divided into two paths, one path entering the combustion chamber of an auxiliary power unit through a starting oil circuit solenoid valve (6) to start the auxiliary power unit; the other path entering the combustion chamber of the auxiliary power unit through a metering valve (7) and a main oil circuit solenoid valve (9) to meter the auxiliary power unit.

8. The device according to claim 7, characterized in that By controlling the opening and closing timing of the starting oil circuit electromagnetic valve (6), the auxiliary power unit is started and supplied with oil.

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