A main / pre-boost integrated system

Abstract

The present invention provides a main / pre-boost integrated system, which can solve the technical problems existing in the fuel supply system of existing aircraft. The main / pre-boost integrated system includes a fuel tank, a dual-motion freedom main / pre-boost integrated electric pump, which is connected to the fuel tank, and includes a driving part and a main / pre-boost integrated dual-motion freedom piston pump. The piston pump includes a cooling centrifugal pump, a reducer, a dual-motion freedom piston pump and a boosting part. The driving part, the cooling centrifugal pump, the reducer and the dual-motion freedom piston pump are connected in sequence. The boosting part is arranged at the upstream fuel inlet of the dual-motion freedom piston pump, which is used to pre-boost the fuel. After pre-boosting, the fuel enters the dual-motion freedom piston pump, the reducer and the cooling centrifugal pump in sequence. The driving part drives the cooling centrifugal pump to rotate and delivers the cooling oil to the equipment to be cooled. The centrifugal pump drives the dual-motion freedom piston pump to rotate through the reducer and delivers the fuel to the engine for combustion.

Description

Technical Field

[0001] The present invention belongs to the technical field of supercharging, and relates to a main / pre-supercharging integrated system. Background Art

[0002] Weight reduction and energy conservation are eternal themes in aircraft development. As the primary energy-consuming system in aircraft, a lightweight and efficient fuel supply system is crucial for reducing the weight of energy batteries and increasing aircraft payload and performance indicators.

[0003] Currently, the aircraft's fuel supply system consists of a pre-boost electric pump, a main electric pump, and a piping system. The pre-boost electric pump consists of a drive motor and a centrifugal pump, while the main electric pump consists of a main drive motor and a gear pump. During operation, fuel is drawn from the fuel tank, pressurized by the pre-boost electric pump, and then split into two paths. One path leads to the main boost electric pump, where it is then delivered to the engine for combustion via a gear pump; the other path leads to equipment that needs cooling, where it cools the equipment and then returns to the fuel tank. Figure 3 As shown. In order to keep the centrifugal pump in a state of higher efficiency, the pre-boost electric pump is generally in a constant high-flow working state. However, since the oil used for engine combustion is much larger than the oil used for equipment cooling, and it will be adjusted over a wide range according to the engine state. Therefore, when the engine is working in a low state (that is, less oil is used for combustion), the excess flow after the pre-boost pump will return to the front of the pre-boost pump through the overflow circuit, causing power loss. At the same time, as the flight time of the aircraft progresses, the temperature of the fuel in the fuel tank will gradually increase and the viscosity of the fuel will decrease. Under high temperature and high pressure conditions, the internal leakage of the gear pump (main pump) increases, and the volumetric efficiency drops sharply, resulting in a decrease in the overall efficiency of the system and an increase in energy consumption, which in turn affects the performance indicators of the aircraft. In addition, since the system has two sets of drive motors, the overall volume and weight are relatively large. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides a main / pre-boost integrated system.

[0006] The technical solution of the present invention is to provide a main / pre-boost integrated system, which includes a device to be cooled and an engine. In addition, the system also includes:

[0007] a fuel tank storing fuel;

[0008] A dual-motion-freedom main / pre-boost integrated electric pump is connected to the fuel tank, and the integrated electric pump includes a drive unit and a main / pre-boost integrated dual-motion-freedom piston pump, wherein the main / pre-boost integrated dual-motion-freedom piston pump includes a cooling centrifugal pump, a reducer, a dual-motion-freedom piston pump and a boosting unit, and the drive unit, the cooling centrifugal pump, the reducer and the dual-motion-freedom piston pump are connected in sequence, and the boosting unit is arranged at the upstream fuel inlet of the dual-motion-freedom piston pump, for pre-boosting the fuel, and the fuel enters the dual-motion-freedom piston pump, the reducer and the cooling centrifugal pump in sequence after pre-boosting, wherein the drive unit drives the cooling centrifugal pump to rotate and delivers the cooling oil to the equipment to be cooled, and the centrifugal pump drives the dual-motion-freedom piston pump to rotate through the reducer, so that the piston pump operates in a suitable working range, and the piston pump also delivers the fuel to the engine for combustion.

[0009] Furthermore, the fuel is returned to the fuel tank after cooling the equipment to be cooled.

[0010] Furthermore, the driving unit is a high-speed driving motor.

[0011] Furthermore, the supercharging part is an inducer.

[0012] Furthermore, the output shaft of the reducer is rotatably connected to the transmission shaft of the dual-motion-freedom piston pump.

[0013] Furthermore, the reducer housing is fixedly connected to the pump housing of the dual-motion-freedom piston pump, the reducer housing inner cavity is connected to the oil cavity of the dual-motion-freedom piston pump, and the structure in the reducer inner cavity is immersed in the fuel.

[0014] Furthermore, the reducer is a planetary gear reducer.

[0015] Furthermore, the reducer is a bevel gear reducer.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] (1) The main / pre-boost integrated system proposed in the present invention integrates a dual-motion free piston pump and a booster (inducer) into one main booster pump, thus achieving main / pre-boost integration. Compared with the separate boosting system of gear pump and centrifugal pump, the dual-motion free piston pump has the advantage of high efficiency and can still maintain high efficiency under high temperature and high pressure conditions. Therefore, the main / pre-boost integrated piston pump has higher overall efficiency and consumes less energy than the main boost (gear pump) + pre-boost (centrifugal pump) split solution.

[0018] (2) The centrifugal pump of the present invention only needs to pressurize and deliver the fuel required for equipment cooling, and adjusts the cooling flow rate according to the engine fuel supply status. Compared with the fuel flow rate required for engine combustion, the fuel flow rate required for equipment cooling is extremely small. Therefore, the power, volume, and weight of the cooling centrifugal pump of the present invention are greatly reduced, thereby significantly reducing the weight of the entire system.

[0019] (3) The present invention uses a high-speed motor as the main pump's drive motor, which is smaller in size and weight than a low-speed motor. However, increasing the speed does not significantly reduce the weight of the oil pump. On the contrary, excessively high speeds can adversely affect the efficiency and suction characteristics of the oil pump. Therefore, a speed reducer is used to slow down the motor and drive the main pump, thereby optimizing the overall benefits of the system.

[0020] (4) The present invention reduces the number of drive motors to one by highly integrating the cooling centrifugal pump, reducer, dual-motion freedom piston pump, and inducer, thereby further reducing the volume and weight of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the embodiments of the present invention, constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0022] Figure 1 Schematic diagram of the main / pre-boost integrated system (fuel supply system) of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the integrated piston pump of the present invention;

[0024] Figure 3 This is a schematic diagram of the existing fuel supply system. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments in 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.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0028] like Figure 1-2 As shown, a main / pre-boost integrated system is provided, which includes a device to be cooled 4 and an engine 3. In addition, the system also includes: a fuel tank 1 and a main / pre-boost integrated electric pump 2 with dual motion degrees of freedom, the fuel tank 1 stores fuel; the main / pre-boost integrated electric pump 2 with dual motion degrees of freedom is connected to the fuel tank 1, and the main / pre-boost integrated electric pump 2 with dual motion degrees of freedom includes a main / pre-boost integrated dual motion degrees of freedom piston pump 22 and a drive unit 21, the main / pre-boost integrated dual motion degrees of freedom piston pump 22 includes a cooling centrifugal pump 221, a reducer 222, a dual motion degrees of freedom piston pump 223 and a boost unit 224, and the drive unit 21. The cooling centrifugal pump 221, the reducer 222 and the dual-motion-freedom piston pump 223 are connected in sequence, and the boosting part 224 is arranged at the upstream fuel inlet of the dual-motion-freedom piston pump 223, for pre-pressurizing the fuel. After pre-pressurization, the fuel enters the dual-motion-freedom piston pump 223, the reducer 222 and the cooling centrifugal pump 221 in sequence, wherein the driving part 21 drives the cooling centrifugal pump 221 to rotate, and delivers the cooling oil to the equipment to be cooled 4. The centrifugal pump drives the dual-motion-freedom piston pump 223 to rotate through the reducer 222, so that the piston pump operates in a suitable working range, and the piston pump also delivers the fuel to the engine 3 for combustion.

[0029] In this embodiment of the present invention, the fuel is returned to the fuel tank 1 after cooling the device to be cooled 4. That is, pipelines connect the fuel tank 1 to the integrated electric pump (the system draws an oil line 10 from the fuel tank 1 to the main / pre-boost integrated electric pump), the integrated electric pump to the device to be cooled 4, and the device to be cooled 4 to the fuel tank 1.

[0030] It can be seen that the dual-motion freedom main / pre-boost integrated electric vehicle of the embodiment of the present invention has two outlets, one of which directs the fuel to the engine 3 for combustion, and the other outlet directs the fuel to the device to be cooled 4, and returns to the fuel tank 1 after cooling the device.

[0031] In addition, for example, the centrifugal pump, reducer 222 and dual-motion-freedom piston pump 223 in the embodiment of the present invention can all adopt existing structures. For example, the reducer 222 is connected to the transmission shaft of the dual-motion-freedom piston pump 223 to drive the transmission shaft to rotate.

[0032] It can be seen that the main / pre-boost integrated system proposed in the embodiment of the present invention integrates the dual-motion freedom piston pump and the inducer into one as the main boost pump, thereby realizing the main / pre-boost integration. Compared with the separate boosting system of the gear pump and the centrifugal pump, the dual-motion free piston pump has the advantage of high efficiency, and can still maintain a high efficiency under high temperature and high pressure conditions. Therefore, the main / pre-boost integrated piston pump has higher overall efficiency and consumes less energy than the main boost (gear pump) + pre-boost (centrifugal pump) split solution. The centrifugal pump in the embodiment of the present invention only needs to pressurize and deliver the fuel required for equipment cooling, and adjust the cooling flow rate according to the engine fuel supply status. Compared with the fuel flow required for engine combustion, the fuel flow required for equipment cooling is extremely small, so the power, volume and weight of the cooling centrifugal pump in the present invention will be greatly reduced, thereby greatly reducing the weight of the entire system. The embodiment of the present invention reduces the drive motor to one through the high integration of the cooling centrifugal pump, the reducer, the dual-motion freedom piston pump and the boosting part, and further reduces the volume and weight of the system.

[0033] Preferably, the driving unit 21 is a high-speed driving motor.

[0034] In other words, using a high-speed motor as the main pump's drive motor reduces its size and weight compared to a lower-speed motor. However, increasing the speed does not significantly reduce the pump's weight. In fact, excessively high speeds can negatively impact the pump's efficiency and suction characteristics. Therefore, using a speed reducer to decelerate the motor and drive the main pump optimizes the system's overall performance.

[0035] That is, the embodiment of the present invention uses a high-speed motor in conjunction with a reducer to optimize the overall benefit of the system.

[0036] Preferably, the boosting unit 224 is an inducer.

[0037] Preferably, the outer shell of the reducer 222 is fixedly connected to the pump shell of the dual-motion freedom piston pump 223, the inner cavity of the outer shell of the reducer 222 is connected to the oil cavity of the dual-motion freedom piston pump 223, and the structure in the inner cavity of the reducer 222 is immersed in the fuel.

[0038] Specifically, an inducer is positioned upstream of the fuel inlet of dual-motion piston pump 223. After being pre-pressurized by the inducer, the fuel sequentially enters the low-pressure chamber of dual-motion piston pump 223, speed reducer 222, and cooling centrifugal pump 221. Speed ​​reducer 222 is completely immersed in the fuel, providing lubrication during operation.

[0039] For example, the reducer 222 may be a planetary gear reducer or a bevel gear reducer.

[0040] In summary, the dual-motion freedom main / pre-boost electric pump of the present invention adjusts its speed according to the engine's oil supply flow demand, and delivers the required flow of fuel to the engine for combustion; the cooling centrifugal pump also changes with the change in the speed of the drive motor, so that the cooling flow varies according to the size of the engine's working state. The cooling flow is large in a large state, and small in a small state. Therefore, the power loss of overflow is saved, and the overall efficiency is higher. The cooling centrifugal pump of the present invention is directly driven by a high-speed drive motor. Since the flow and pressure of the equipment cooling are much smaller than the fuel flow and pressure required for engine combustion, the power, volume and weight of the cooling centrifugal pump in the present invention will be greatly reduced compared to traditional main / pre-boost split equipment. The present invention integrates a dual-motion freedom piston pump and an inducer into one as a main boost pump, realizing main / pre-boost integration. Compared with the gear pump and centrifugal pump split boosting system, the dual-motion free piston pump has the advantage of high efficiency and can still maintain a high efficiency under high temperature and high pressure conditions. Therefore, the main / pre-boost integrated piston pump has higher overall efficiency and consumes less energy than the main boost (gear pump) + pre-boost (centrifugal pump) split solution.

[0041] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A main / pre-boost integrated system, comprising a device to be cooled and an engine, characterized in that: The system further comprises: a fuel tank storing fuel; A dual-motion-freedom main / pre-boost integrated electric pump is connected to the fuel tank, and the integrated electric pump includes a drive unit and a main / pre-boost integrated dual-motion-freedom piston pump, wherein the main / pre-boost integrated dual-motion-freedom piston pump includes a cooling centrifugal pump, a reducer, a dual-motion-freedom piston pump and a boosting unit, and the drive unit, the cooling centrifugal pump, the reducer and the dual-motion-freedom piston pump are connected in sequence, and the boosting unit is arranged at the upstream fuel inlet of the dual-motion-freedom piston pump, for pre-boosting the fuel, and the fuel enters the dual-motion-freedom piston pump, the reducer and the cooling centrifugal pump in sequence after pre-boosting, wherein the drive unit drives the cooling centrifugal pump to rotate and delivers the cooling oil to the equipment to be cooled, and the centrifugal pump drives the dual-motion-freedom piston pump to rotate through the reducer, so that the piston pump operates in a suitable working range, and the piston pump also delivers the fuel to the engine for combustion.

2. The main / pre-boost integrated system according to claim 1, characterized in that: The fuel cools the equipment to be cooled and then flows back to the fuel tank.

3. The main / pre-boost integrated system according to claim 1, characterized in that: The driving part is a high-speed driving motor.

4. A main / pre-boost integrated system according to claim 1 or 3, characterized in that: The supercharging part is an inducer.

5. The main / pre-boost integrated system according to claim 1, characterized in that: The output shaft of the speed reducer is rotatably connected to the transmission shaft of the dual-motion freedom piston pump.

6. The main / pre-boost integrated system according to claim 5, characterized in that: The reducer housing is fixedly connected to the pump housing of the dual-motion freedom piston pump, the reducer housing cavity is connected to the oil cavity of the dual-motion freedom piston pump, and the structure in the reducer cavity is immersed in the fuel.

7. A main / pre-boost integrated system according to claim 5 or 6, characterized in that: The reducer is a planetary gear reducer.

8. A main / pre-boost integrated system according to claim 5 or 6, characterized in that: The reducer is a bevel gear reducer.

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