Wide-temperature-range high-precision electric oil supply device

Abstract

The invention provides a wide-temperature-range high-precision electric oil supply device. The wide-temperature-range high-precision electric oil supply device comprises a gear pump, a motor, a controller and a flow temperature measuring device. The end part of a central shaft of a driving gear of the gear pump extends out of a pump shell of the gear pump and is coaxially connected with an output shaft of a motor, and the motor is used for driving the driving gear to rotate; the end part of a central shaft of the driving gear and the pump shell are mechanically sealed; a cooling loop and a cooling passage are arranged in the gear pump and are respectively used for cooling and lubricating the mechanical seal; the flow temperature measuring device is used for feeding back a temperature signal and a flow signal of fuel oil to the controller, the controller controls the rotating speed of the motor according to the temperature signal and the flow signal, and the flow of the fuel oil output by the gear pump is adjusted in real time. The valve can meet the requirements of high temperature and wide temperature range, and wide temperature range high-precision flow control is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of combination and new power technology, and relates to a wide-temperature-range high-precision electric oil supply device. BACKGROUND

[0002] The fuel oil regulating system of the combined engine adopts the electric oil supply device to realize the fuel supply and regulating functions, the working medium temperature range is wide, is from-50 DEG C to 230 DEG C, the environmental temperature is-50 DEG C to 350 DEG C, and needs to meet that the fuel flow control precision is less than 1% in the whole temperature range. The working medium temperature range of the traditional electric oil supply device is relatively narrow, and the highest oil temperature is less than 150 DEG C. The high oil temperature and wide temperature range use conditions limit the working reliability and control precision of the oil supply device, and therefore the wide-temperature-range high-precision electric oil supply device needs to be further researched.

[0003] At present, most of the electric oil supply devices commonly used in engines adopt the motor gear pump form. The volume efficiency of the gear pump is significantly reduced when the oil temperature is higher than 120 DEG C, so it is difficult to guarantee the flow control precision. When the oil temperature is higher than 150 DEG C, the fuel movement viscosity sharply decreases, the fuel saturated steam pressure increases and is extremely easy to vaporize. The dynamic seal of the gear pump is extremely easy to cause dry friction due to insufficient lubrication and cooling, so the dynamic seal is invalid and the structure is damaged, and it is difficult to work reliably for a long time. When the fuel temperature range is further widened, from-50 DEG C to 230 DEG C, the fuel density changes greatly, the displacement and efficiency of the gear pump change greatly, the flow control precision of the oil supply device is poor, and meanwhile the oil temperature is too high, so the dynamic seal of the gear pump is extremely easy to fail. The high oil temperature and high environmental temperature make the motor, the gear pump and the controller have extremely low working reliability. Therefore, the problems of the working reliability of the oil supply device caused by the wide-temperature-range high oil temperature and the low flow control precision need to be solved. SUMMARY

[0004] The purpose of the application aims at solving at least one of the problems in the prior art.

[0005] Therefore, the application provides a wide-temperature-range high-precision electric oil supply device, which can be applied to the requirements of high temperature and wide temperature range, and improve the wide-temperature-range high-precision flow control.

[0006] The technical solution of the application is as follows:

[0007] A wide-temperature-range high-precision electric oil supply device, comprising a gear pump, a motor, a controller and a flow temperature measuring device.

[0008] The central shaft end of the driving gear of the gear pump protrudes from the pump shell of the gear pump and is coaxially connected with the output shaft of the motor, and the motor is used for driving the driving gear to rotate. The mechanical seal is arranged between the central shaft end of the driving gear and the pump shell.

[0009] The gear pump is provided with a cooling circuit and a cooling passage, which are respectively used for cooling and lubricating the mechanical seal;

[0010] The flow temperature measuring device is used for feeding back the temperature signal and the flow signal of the fuel oil to the controller, and the controller controls the rotating speed of the motor according to the temperature signal and the flow signal, so as to realize the real-time adjustment of the fuel flow output by the gear pump.

[0011] Further, the pump housing is machined with an oil inlet and an oil outlet;

[0012] The driving gear of the gear pump is installed in the pump housing through a pair of bearings, the driven gear of the gear pump is installed in the pump housing through another pair of bearings, and the driving gear is engaged with the driven gear.

[0013] The cooling circuit is:

[0014] The central shaft of the driving gear is provided with an axial oil cavity and a plurality of oil throwing holes; the axial oil cavity is communicated with the oil inlet of the pump housing; one end of each oil throwing hole is communicated with the axial oil cavity, and the other end is communicated with the cavity where the mechanical seal is located; a pair of bearings located outside the central shaft of the driving gear are driving gear bearings, the inner circumferential surface of the driving gear bearing is machined with a spiral groove, one end of the spiral groove is communicated with the cavity where the mechanical seal is located through the installation gap in the pump housing, and the other end is communicated with the oil inlet of the pump housing through the installation gap in the pump housing; so that the oil inlet of the pump housing, the axial oil cavity of the central shaft of the driving gear, the oil throwing hole, the cavity where the mechanical seal is located, the spiral groove, and the oil inlet of the pump housing form a cooling circuit in sequence; the fuel oil entering the axial oil cavity from the oil inlet of the pump housing is forced to be thrown out and pressurized by the centrifugal force generated by the high-speed rotation of the central shaft of the driving gear, enters the cavity where the mechanical seal is located to cool and lubricate the mechanical seal, and then returns to the oil inlet of the pump housing through the spiral groove to form a cycle.

[0015] Further, the plurality of oil throwing holes are uniformly distributed along the circumference of the central shaft of the driving gear.

[0016] Further, the pump housing is machined with an oil inlet and an oil outlet;

[0017] The driving gear of the gear pump is installed in the pump housing through a pair of bearings, the driven gear of the gear pump is installed in the pump housing through another pair of bearings, and the driving gear is engaged with the driven gear.

[0018] The cooling passage is:

[0019] The pump housing is machined with an oil guiding throttle hole, one end of the oil guiding throttle hole is communicated with a cavity where the mechanical seal is located, and the other end is communicated with an oil outlet of the pump housing; the oil outlet of the pump housing, the oil guiding throttle hole, the cavity where the mechanical seal is located, the spiral groove and the oil inlet of the pump housing sequentially form a cooling passage; the fuel at the oil outlet of the pump housing enters the cavity where the mechanical seal is located through the oil guiding throttle hole, and after cooling and lubricating the mechanical seal, the fuel returns to the oil inlet of the pump housing through the spiral groove.

[0020] Further, a set of compensation springs are installed between the bearing end face of the driving gear and the step face in the pump housing; another set of compensation springs are installed between the bearing end face of the driven gear and the step face in the pump housing; the two sets of compensation springs are used for compensating the bearing axial gap under high pressure.

[0021] Further, the pump housing is made of titanium alloy material.

[0022] Further, the flow temperature measuring device comprises a differential pressure flowmeter and a temperature sensor; the temperature sensor is used for measuring the temperature signal of the fuel at the oil outlet of the gear pump, and the differential pressure flowmeter is used for measuring the flow signal of the fuel at the oil outlet of the gear pump; wherein the differential pressure flowmeter realizes the measurement of the flow by using an embedded differential pressure sensor, and the differential pressure sensor is used for measuring the differential pressure signal at the oil outlet of the gear pump.

[0023] Further, the controller calculates the relationship between the fuel flow and the motor speed under the corresponding temperature according to the instruction flow q z and the temperature signal, and adjusts the motor speed in real time through the deviation between the flow signal and the instruction flow q z .

[0024] Further, the calculation process of the controller is as follows:

[0025] (1) According to the temperature signal provided by the temperature sensor and the instruction flow q z , the temperature-based instruction speed n t is calculated:

[0026]

[0027] Wherein, r s is the fuel density in the calibration test; r t is the fuel density under the current temperature corresponding to the temperature signal; n zs is the speed of the instruction flow q z in the calibration test, which is obtained by fitting the calibration test data; a and b are calibration coefficients, which are obtained by fitting the calibration test data.

[0028] (2) The flow signal q is calculated according to the differential pressure signal DP measured by the differential pressure sensor.m :

[0029]

[0030] Wherein k1, k2, k3 are calibration coefficients, which are obtained by fitting calibration test data;

[0031] (3) according to the measured flow signal q m And the temperature-based command speed n t Solve the final speed command n Z :

[0032]

[0033] Further, an oil cooling channel is arranged in the motor housing of the motor, the oil cooling channel is communicated with one branch of the oil outlet of the pump housing, and the fuel output by the gear pump is introduced to actively cool the motor.

[0034] By applying the above technical scheme, the present application has the following beneficial effects:

[0035] (1) The wide-temperature-range high-precision electric oil supply device of the present application is provided with a cooling circuit and a cooling passage in the gear pump to cool and lubricate the mechanical seal, and can adapt to high temperature and wide temperature range requirements; the controller is designed with temperature compensation function and flow feedback closed-loop control to realize wide-temperature-range high-precision flow control; and can be applied in the field of aerospace engine fuel pumps.

[0036] (2) The present application designs an active cooling structure form at the mechanical seal: the central shaft of the driving gear is designed with uniformly distributed oil throwing holes, the oil throwing hole outlet is connected to the cavity where the mechanical seal is located, and then forms a passage with the spiral groove of the bearing; and the oil outlet of the pump housing is connected to the oil guiding throttle hole of the cavity where the mechanical seal is located, the fuel is introduced into the cavity where the mechanical seal is located, the lubricating and cooling oil flow is increased, and the heat dissipation condition of the mechanical seal working surface is improved; this structure form can realize the active circulation of the cooling medium of the shaft seal working surface under high temperature medium conditions, ensure the effective cooling of the shaft seal, and improve the working reliability and service life.

[0037] (3) The pump housing material of the present application adopts titanium alloy which can resist 350 DEG C and has expansion coefficient close to that of the gear, so that the axial gap and radial gap in the gear pump are less affected by temperature change, and the volumetric efficiency of the gear pump in wide temperature range is improved.

[0038] (4) The controller of the present application collects temperature signals and flow signals, and realizes high-precision flow control in wide temperature range through software algorithm temperature revision of the relationship between flow and speed, which can ensure that the flow control precision meets the index requirements in the full temperature range.

[0039] (5) The motor shell of the motor of the application is provided with an oil-patrolling cooling channel, and active cooling is adopted to meet the high-temperature reliable working requirement.

[0040] To sum up, the gear pump of the application greatly increases the mechanical seal cooling oil flow under high oil temperature by designing the active oil throwing hole and leading the fuel into the cavity where the mechanical seal is located, improves the mechanical seal cooling effect, and improves the working reliability; the material system of the gear pump ensures that the volume efficiency of the gear pump is maintained at a high point within a wide temperature range, reduces the influence of temperature on the displacement of the gear pump, and maintains the high efficiency of the gear pump; the controller collects temperature and flow signals, and realizes high-precision flow control within a wide temperature range through temperature revision and flow feedback closed-loop control of the relationship between flow and speed by software algorithm; therefore, the wide-temperature-range high-precision electric oil supply device of the application has passed the high-temperature test and verification of 230 DEG C oil temperature and 350 DEG C environment, and the oil supply device can work reliably under high temperature conditions, and the flow control precision is less than 1%. BRIEF DESCRIPTION OF DRAWINGS

[0041] The accompanying drawings included to provide a further understanding of the embodiments of the application and constitute a part of the specification, illustrate the embodiments of the application and together with the text description serve to explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 is a structural diagram of the application;

[0043] Figure 2 is a structural diagram of the gear pump;

[0044] Figure 3 is a structural diagram of the spiral groove of the active gear bearing;

[0045] Figure 4 is a layout schematic diagram of the oil guiding throttle hole;

[0046] Figure 5 is a structural diagram of the oil-patrolling cooling channel of the motor;

[0047] Figure 6 is a working principle diagram of the controller;

[0048] Among them, 1-pump shell, 2-active gear, 3-driven gear, 4-bearing, 5-compensating spring, 6-mechanical seal, 7-oil throwing hole, 8-oil guiding throttle hole, 9-cavity where the mechanical seal is located, 10-oil outlet, 11-motor shell, 12-oil-patrolling cooling channel. DETAILED DESCRIPTION

[0049] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one example embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0050] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component and / or combinations thereof.

[0051] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various examples herein are not limiting of the scope of the application. Also, it is to be understood that the various embodiments can be utilized in different combinations, and that one or more embodiments, including structural and / or adverse combinations can be utilized without departing from the scope of the present application. The drawings are not necessarily to scale as the emphasis is generally upon the functional teaching rather than the precise structural characteristics. The technical, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] The present embodiment discloses a wide-temperature-range high-precision electric oil supply device, referring to the accompanying Figure 1 , comprising: a gear pump, a motor, a controller and a flow temperature measuring device;

[0053] Referring to the accompanying Figure 2 The gear pump is an external gear pump, which realizes fuel supply and metering function, and the main structure is similar to that of a conventional gear pump, comprising: a driving gear 2, a driven gear 3, two pairs of bearings 4, a pump housing 1, two sets of compensation springs 5 and a mechanical seal 6;

[0054] The pump housing 1 is machined with an oil inlet and an oil outlet 10;

[0055] The driving gear 2 is mounted inside the pump housing 1 via a pair of bearings 4. A set of compensating springs 5 ​​is installed between the end face of the bearings 4 and the stepped surface inside the pump housing 1. The driven gear 3 is mounted inside the pump housing 1 via another pair of bearings 4. Another set of compensating springs 5 ​​is installed between the end face of the bearings 4 and the stepped surface inside the pump housing 1. The driving gear 2 meshes with the driven gear 3. The two sets of compensating springs 5 ​​are used to compensate for the axial clearance of the bearings 4 under high pressure.

[0056] The central shaft end of the drive gear 2 extends out of the pump housing 1 and is coaxially connected to the output shaft of the motor. The motor is used to drive the drive gear 2 to rotate. A mechanical seal 6, i.e. a dynamic seal, is used between the central shaft end of the drive gear 2 and the pump housing 1 to achieve sealing between the inner cavity of the gear pump (i.e. the inner cavity of the pump housing 1) and the outside.

[0057] To address the reliability issue of the gear pump operating at high temperatures, the central shaft of the drive gear 2 is equipped with an axial oil chamber and several oil-throwing holes 7. The axial oil chamber communicates with the oil inlet on the pump housing 1. The oil-throwing holes 7 are evenly distributed circumferentially along the central shaft of the drive gear 2, with one end of each oil-throwing hole 7 communicating with the axial oil chamber and the other end communicating with the cavity 9 where the mechanical seal is located. A pair of bearings 4 located outside the central shaft of the drive gear 2 are designated as drive gear bearings. The inner circumferential surface of the drive gear bearings is machined with a helical groove, as shown in the attached diagram. Figure 3 As shown, one end of the spiral groove can communicate with the mechanical seal cavity 9 through the installation gap inside the pump housing 1, and the other end can communicate with the oil inlet of the pump housing 1 through the installation gap inside the pump housing 1. This makes the oil inlet of the pump housing 1, the axial oil cavity of the central shaft of the drive gear 2, the oil slinger hole 7, the mechanical seal cavity 9, the spiral groove, and the oil inlet of the pump housing 1 form a cooling circuit in sequence. The fuel entering the axial oil cavity from the oil inlet of the pump housing 1 is forced out and pressurized through the oil slinger hole 7 by the centrifugal force generated by the high-speed rotation of the central shaft of the drive gear 2. It then enters the mechanical seal cavity 9 to cool and lubricate the mechanical seal 6, and returns to the oil inlet of the pump housing 1 through the spiral groove to form a circulation. This cooling circuit can increase the flow rate of lubricating and cooling oil and improve the heat dissipation conditions of the working surface of the mechanical seal 6.

[0058] To address the reliability issue of gear pumps operating at high temperatures, an oil guide throttling orifice 8 is machined on the pump housing 1. One end of the oil guide throttling orifice 8 communicates with the cavity 9 containing the mechanical seal, and the other end communicates with the oil outlet 10 of the pump housing 1, as shown in the attached diagram. Figure 4The oil outlet 10 of the pump housing 1, the oil guiding throttle hole 8, the cavity 9 where the mechanical seal is located, the spiral groove, and the oil inlet of the pump housing 1 sequentially form a cooling channel; the fuel at the oil outlet 10 of the pump housing 1 enters the cavity 9 where the mechanical seal is located through the oil guiding throttle hole 8, cools and lubricates the mechanical seal 6, and then returns to the oil inlet of the pump housing 1 through the spiral groove; the cooling channel can further increase the flow of lubricating and cooling oil, and improve the heat dissipation condition of the working surface of the mechanical seal 6;

[0059] To solve the problem of low flow control precision of the gear pump in a wide temperature range, the driving gear 2 and the driven gear 3 are made of high-temperature alloy steel, the compensation spring 5 is made of high-temperature spring steel wire, and the pump housing 1 is made of titanium alloy with a thermal expansion coefficient close to that of the driving gear 2 and the driven gear 3, so that the axial gap and the radial gap of the gear pump change less with temperature, and the volumetric efficiency of the gear pump in a wide temperature range can be improved;

[0060] The controller is used to control the rotating speed of the motor, and then control the fuel flow output from the gear pump; to solve the problem of low flow control precision of the gear pump in a wide temperature range, the controller adopts a temperature compensation and flow temperature feedback closed-loop control algorithm to realize high-precision control of the fuel flow in a wide temperature range, and the specific implementation is as follows:

[0061] The flow temperature measuring device is used to feed back the temperature signal and the flow signal to the controller, and includes a differential pressure flowmeter and a temperature sensor; the temperature sensor is used to measure the temperature signal of the fuel at the oil outlet 10 of the gear pump, and the differential pressure flowmeter is used to measure the flow signal of the fuel at the oil outlet 10 of the gear pump; wherein the differential pressure flowmeter adopts a built-in differential pressure sensor to measure the flow, and the differential pressure sensor is used to measure the differential pressure signal at the oil outlet 10 of the gear pump;

[0062] The controller calculates the relationship between the fuel flow and the rotating speed of the motor at the corresponding temperature according to the instruction flow q z and the temperature signal, and adjusts the rotating speed of the motor in real time through the deviation between the flow signal (calculated through the differential pressure signal) and the instruction flow q z , so as to achieve the purpose of high-precision flow control, as shown in the accompanying drawings. Figure 6 The specific calculation process is as follows:

[0063] (1) The flow-speed calculation module based on the temperature sensor in the controller calculates the temperature-based instruction rotating speed n t according to the temperature signal provided by the temperature sensor and the instruction flow q z :

[0064]

[0065] Wherein, r s is the fuel density of the calibration test, and the unit is kg / m3 t is the fuel density corresponding to the current temperature of the temperature signal, in kg / m 3 zs is the command flow q z The rotational speed at the time of calibration test can be obtained by fitting the calibration test data; a, b are calibration coefficients, which can be obtained by fitting the calibration test data;

[0066] (2) The flow-rate-rotational speed calculation module in the controller based on the differential pressure sensor calculates the measured flow-rate signal q m according to the differential pressure signal DP (unit: kPa) measured by the differential pressure sensor;

[0067]

[0068] where k1, k2, k3 are calibration coefficients, which can be obtained by fitting the calibration test data;

[0069] (3) The flow-rate-rotational speed comprehensive calculation module in the controller based on the feedback flow-rate calculates the final rotational speed command n Z according to the measured flow-rate signal q m and the rotational speed command n t based on the temperature:

[0070]

[0071] In addition, to solve the problem of high-temperature working reliability of the motor, the motor adopts a permanent magnet synchronous motor, a rotary transformer is used to provide position feedback, a thermal resistance inside the motor is used to provide motor temperature feedback, and an oil-circulating cooling channel 12 is arranged in the motor housing 11, as shown in the accompanying drawings. The oil-circulating cooling channel 12 is in communication with one branch of the oil outlet 10 of the pump housing 1, and the fuel output by the gear pump can be introduced to actively cool the motor stator and rotor and the rotary transformer. Figure 5

[0072] ​​​For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0073] In addition, it should be pointed out that the use of "first", "second" and the like words to define parts, only for the convenience of the corresponding parts to be distinguished, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of the present application.

[0074] The above only for the preferred embodiments of the present application, and is not intended to limit the present application, for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A wide-temperature-range high-precision electric oil supply device, characterized by comprising: The application relates to a gear pump, a motor, a controller and a flow temperature measuring device. The central shaft end of the driving gear of the gear pump extends out of the pump shell of the gear pump and is coaxially connected with the output shaft of the motor, and the motor is used for driving the driving gear to rotate; mechanical seal is adopted between the central shaft end of the driving gear and the pump shell. The gear pump is provided with a cooling loop and a cooling channel, which are respectively used for cooling and lubricating the mechanical seal. The flow temperature measuring device is used for feeding the temperature signal and the flow signal of fuel to the controller, the controller controls the rotating speed of the motor according to the temperature signal and the flow signal, and the real-time regulation of the fuel flow output by the gear pump is realized. The pump shell is provided with an oil inlet and an oil outlet; 2. The high-precision electric oil supply device of claim 1, wherein The driving gear of the gear pump is installed in the pump shell through a pair of bearings, the driven gear of the gear pump is installed in the pump shell through another pair of bearings, and the driving gear is engaged with the driven gear. The cooling loop is as follows: An axial oil cavity and a plurality of oil throwing holes are arranged in the central shaft of the driving gear; the axial oil cavity is communicated with the oil inlet of the pump shell; one end of each oil throwing hole is communicated with the axial oil cavity, and the other end is communicated with the cavity where the mechanical seal is arranged; a pair of bearings located outside the central shaft of the driving gear are driving gear bearings, the inner circumferential surface of the driving gear bearings is provided with a spiral groove, one end of the spiral groove is communicated with the cavity where the mechanical seal is arranged through the installation gap in the pump shell, and the other end is communicated with the oil inlet of the pump shell through the installation gap in the pump shell; the oil inlet of the pump shell, the axial oil cavity of the central shaft of the driving gear, the oil throwing holes, the cavity where the mechanical seal is arranged, the spiral groove and the oil inlet of the pump shell sequentially form the cooling loop; the fuel entering the axial oil cavity from the oil inlet of the pump shell is forced to be thrown out and pressurized through the oil throwing holes by the centrifugal force generated by the high-speed rotation of the central shaft of the driving gear, enters the cavity where the mechanical seal is arranged to cool and lubricate the mechanical seal, and then returns to the oil inlet of the pump shell through the spiral groove to form a cycle. The plurality of oil throwing holes are uniformly distributed along the circumference of the central shaft of the driving gear.

3. The high-precision electric oil supply device of claim 2, wherein The pump shell is provided with an oil inlet and an oil outlet; 4. The high-precision electric oil supply device of claim 1, wherein The driving gear of the gear pump is installed in the pump shell through a pair of bearings, the driven gear of the gear pump is installed in the pump shell through another pair of bearings, and the driving gear is engaged with the driven gear. The cooling channel is as follows: The pump shell is provided with a guide oil throttling hole, one end of the guide oil throttling hole is communicated with the cavity where the mechanical seal is arranged, and the other end is communicated with the oil outlet of the pump shell; the oil outlet of the pump shell, the guide oil throttling hole, the cavity where the mechanical seal is arranged, the spiral groove and the oil inlet of the pump shell sequentially form the cooling channel; the fuel at the oil outlet of the pump shell enters the cavity where the mechanical seal is arranged through the guide oil throttling hole, cools and lubricates the mechanical seal, and then returns to the oil inlet of the pump shell through the spiral groove. A set of compensation springs are installed between the bearing end surface of the driving gear and the step surface in the pump shell; another set of compensation springs are installed between the bearing end surface of the driven gear and the step surface in the pump shell; the two sets of compensation springs are used for compensating the axial gap of the bearings under high pressure.

5. A high-precision electric oil supply device with a wide temperature range according to any one of claims 2 to 4, characterized in that, The pump shell is made of titanium alloy material.

6. A high-precision electric oil supply device with a wide temperature range according to any one of claims 1 to 4, characterized in that, ​ 7. A high-precision electric oil supply device with a wide temperature range according to any one of claims 1 to 4, characterized in that, The flow temperature measuring device comprises a differential pressure flowmeter and a temperature sensor; the temperature sensor is used for measuring the temperature signal of fuel at the oil outlet of the gear pump, and the differential pressure flowmeter is used for measuring the flow signal of fuel at the oil outlet of the gear pump; wherein the differential pressure flowmeter adopts an internal differential pressure sensor to measure the flow, and the differential pressure sensor is used for measuring the differential pressure signal at the oil outlet of the gear pump.

8. The high-precision electric oil supply device of claim 7, wherein The controller calculates the relationship between the fuel flow and the motor speed at the corresponding temperature according to the temperature signal and the instruction flow q z and the temperature signal, calculates the relationship between the fuel flow and the motor speed at the corresponding temperature, and adjusts the motor speed in real time through the flow signal and the instruction flow q z deviation; wherein the flow signal is calculated by the pressure difference signal.

9. The high-precision electric oil supply device of claim 8, wherein The calculation process of the controller is as follows: (1) based on the temperature signal provided by the temperature sensor and the command flow rate q z solving the temperature-based command rotational speed n t : wherein r s is the fuel density at the calibration test; r t is the fuel density at the current temperature corresponding to the temperature signal; n zs is the command flow rate q z is the speed at the calibration test, obtained by fitting the calibration test data; a, b are calibration coefficients, obtained by fitting the calibration test data; (2) Resolving the measured flow signal q from the differential pressure signal DP measured by the differential pressure sensor m : Wherein k1, k2, k3 are calibration coefficients, which are obtained by fitting calibration test data; (3) The flow rate signal q measured m and the temperature-based command speed n t solving the final speed command n Z :

10. The high-precision electric oil supply device of claim 1, wherein The motor shell is provided with an oil-patrolling cooling channel, the oil-patrolling cooling channel is communicated with one branch of the oil outlet of the pump shell, and the fuel output by the gear pump is introduced to actively cool the motor.

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