Motor inner cavity oil immersion integrated electronic fuel pump

Abstract

The utility model belongs to the technical field of electronic fuel pumps, and discloses a motor inner cavity oil immersion integrated electronic fuel pump which is characterized by comprising a pump body, a motor and a driver which are integrated into an integrated structure. Wherein the motor is a motor with an oil-immersed inner cavity, the pump body comprises a driving gear, a driven gear and a pump cover, a motor shell of the motor and a pump base are of the same structure, the driving gear and the driven gear are arranged between the pump cover and the pump base, the driving gear is connected with a rotor of the motor, and a fuel oil medium enters the inner cavity of the motor through a rotor via hole; the driver is installed at the other end of the motor. The integrated electronic fuel pump has the advantages of being compact in structure, small in size, light in weight and the like, the motor and the gear pump are of an integrated structure, and the integrated electronic fuel pump can be suitable for various small piston or turbojet engines. According to the motor for the electronic fuel pump, an inner cavity oil immersion mode is adopted, a fuel medium of the motor is used for cooling the motor, additional cooling design is not needed, and the efficiency is higher. The stator coil and the shell of the motor for the electronic fuel pump form an integrated sealing structure after being filled with glue, so that a movable sealing element on a shaft is omitted, the reliability of the fuel pump is improved, and oil leakage can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic fuel pumps and relates to a high-efficiency electronic fuel pump, in particular to an integrated electronic fuel pump with an inner cavity of a motor immersed in oil. Background Art

[0002] The electronic fuel pump is an important device used in the engine fuel system. The basic principle is to use the motor to drive the rotor or impeller in the pump body to rotate at high speed. Under the action of centrifugal force, the structure of the rotor or impeller will cause the flow of fuel in the pump to change, forming a vacuum low pressure at the oil inlet. The fuel pressure after suction gradually increases, forming a high-pressure fuel flow at the oil outlet.

[0003] Traditional electronic fuel pumps consist of a permanent magnet motor and a pump body. The motor, which powers the pump, consists of permanent magnets fixed to the housing, an armature that generates electromagnetic torque, and a brush assembly mounted on the housing. The brushes contact the armature's commutator, and wires from the brushes are routed through terminals on the housing and then connected to an external controller. Pump bodies come in various types, including roller, vane, and gear.

[0004] Conventional electronic fuel pumps utilize separate permanent magnet motors and pump bodies, sealed to prevent the fuel in the pump body from entering the permanent magnet motor. Furthermore, to maximize the pump's pressurization efficiency, the permanent magnet motor must operate at extremely high speeds, generating significant heat. This requires specialized cooling devices, including but not limited to external air bleeds, oil channel design, and the use of alternative heat sinks. In environments with limited heat sink capacity, such as aircraft, the heat generated by the permanent magnet motor can create a significant heat sink burden.

[0005] Small engines are generally installed in compact working environments, and their corresponding electronic fuel pumps need to be miniaturized. However, based on the aforementioned issues, it is difficult for electronic fuel pumps to operate efficiently while being miniaturized, and the heat generated by them is difficult to address during the miniaturization process. Utility Model Content

[0006] In order to solve the above problems, the utility model provides an integrated electronic fuel pump with oil-immersed inner cavity of the motor. By adopting a high-speed motor and an inner cavity oil-immersed motor, the coil and the shell are glue-filled to form an integrated sealing structure to prevent oil leakage, forming a small, high-speed and high-efficiency gear pump integrating a gear pump and a motor.

[0007] The technical solution of the utility model is as follows:

[0008] An integrated electronic fuel pump with an inner cavity of a motor immersed in oil is characterized in that it includes a pump body, a motor and a driver integrated into an integrated structure; wherein the motor is an inner cavity immersed in oil motor, the pump body includes a driving gear, a driven gear and a pump cover, the motor housing and the pump base of the motor are of the same structure, the driving gear and the driven gear are arranged between the pump cover and the pump base, the driving gear is connected to the rotor of the motor, and the fuel medium enters the inner cavity of the motor through the rotor through-hole; the driver is installed at the other end of the motor.

[0009] Furthermore, the rotor is installed in the pump base through a first bearing and a second bearing, and both the first bearing and the second bearing are provided with an oil passage.

[0010] Furthermore, the stator of the motor and the pump base are fixedly connected by solidifying glue.

[0011] Furthermore, the lead wires of the stator pass through the solidified glue and are connected to a driver located at the rear end of the motor.

[0012] Furthermore, an end cover is installed at the other end of the pump base corresponding to the pump body, and a sealing structure is provided between the end cover and the stator, and between the end cover and the pump base; and the driver is provided outside the end cover.

[0013] Furthermore, in addition to the rear end, end cover and driver of the motor, a rear cover is also provided.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. The integrated electronic fuel pump of the present invention has the characteristics of compact structure, small size, light weight, high efficiency and high reliability. The motor and gear pump are integrated into one structure and can be widely used in a variety of small piston (turbojet) engines.

[0016] 2. The motor for the electronic fuel pump adopts an inner cavity oil immersion mode, using its own fuel medium to cool itself, without the need for additional cooling design, and is more efficient.

[0017] 3. The stator coil and housing of the motor used in the electronic fuel pump are glued to form an integrated sealing structure, eliminating the dynamic seal on the shaft, improving the reliability of the fuel pump and effectively preventing oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation method of the utility model patent, the following is a brief introduction to the drawings required for use in the implementation method. It should be understood that the following drawings only show certain embodiments of the utility model patent and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1It is a structural diagram of the utility model;

[0020] Figure 2 It is a side view of the utility model;

[0021] Among them, 1 is the driving gear, 2 is the driven gear, 3 is the pump cover, 4 is the pump base, 5 is the rotor, 6 is the first bearing, 7 is the second bearing, 8 is the end cover, 9 is the stator, 10 is the driver, 11 is the rear cover, 12 is the third bearing, 13 is the screw, 14 is the first sealing ring, 15 is the second sealing ring, 16 is the cable, 17 is the fuel medium, 18 is the oil inlet, and 19 is the oil outlet. DETAILED DESCRIPTION

[0022] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships, which are given in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; mechanical connections, point connections; direct connections, connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] Example 1:

[0026] An integrated electronic fuel pump with an inner cavity of a motor immersed in oil is characterized in that it includes a pump body, a motor and a driver 10 integrated into an integrated structure; wherein the motor is an inner cavity immersed in oil motor, the pump body includes a driving gear 1, a driven gear 2 and a pump cover 3, the motor housing and the pump base 4 of the motor have the same structure, the driving gear 1 and the driven gear 2 are arranged between the pump cover 3 and the pump base 4, the driving gear 1 is connected to the rotor 5 of the motor, and the fuel medium enters the inner cavity of the motor through the rotor through hole; the driver 10 is installed at the other end of the motor.

[0027] The rotor 5 is mounted in the pump base 4 via a first bearing 6 and a second bearing 7 . Both the first bearing 6 and the second bearing 7 are provided with oil passages.

[0028] The stator 9 of the motor and the pump base 4 are fixedly connected by solidifying glue.

[0029] The lead wires of the stator 9 pass through the solidified glue and are connected to the driver 10 located at the rear end of the motor.

[0030] An end cover 8 is installed on the other end of the pump base 4 corresponding to the pump body. A sealing structure is provided between the end cover 8 and the stator 9 and between the end cover 8 and the pump base 4 ; a driver 10 is provided outside the end cover 8 .

[0031] In addition to the rear end of the motor, the end cover 8 and the driver 10, a rear cover 11 is also provided.

[0032] Example 2:

[0033] The invention relates to an integrated electronic fuel pump with an inner cavity of a motor immersed in oil, which adopts a single-end oil-immersed motor, a pump and a driver integrated solution.

[0034] The pump cover 3 is mounted to the left end of the motor housing via screws 13. The pump cover 3 is a cylindrical structure with a diameter identical to that of the motor housing, effectively extending the motor housing. The motor housing itself also serves as the pump base 4. The left end face of the motor housing houses the pump's internal structure, housing a blind hole for mounting the driven gear 2 and a matching bearing. The inside of the pump cover 3 has two corresponding blind holes and bearings for mounting the driving gear 1 and driven gear 2, respectively. The driven gear 2 is mounted between the two blind holes via a gear shaft, while the driving gear 1 is mounted directly on the motor shaft. The pump cover 3 is provided with a fuel inlet and outlet.

[0035] The inner diameter of the motor shaft hole of the motor housing is larger than the diameter of the motor shaft, so that the fuel can enter the interior of the motor housing easily.

[0036] The structural features inside the motor housing are as follows: the stator and the motor housing are formed into a whole by glue pouring, which ensures both structural stability and sealing.

[0037] In order to further ensure the sealing performance, a sealing structure is provided between the pump cover 3 and the motor housing, and between the motor housing and the end cover 8 , including a first sealing ring 14 and a second sealing ring 15 .

[0038] The motor is closed at one end of the end cover and connected to the control system at the rear end through lead wires.

[0039] The electronic fuel pump has a compact structure, and the motor therein is a small or micro high-speed motor. While ensuring the fuel pressure, the volume of the pump is further reduced, so that the diameter of the electronic fuel pump of the utility model is set to about 25 mm, and the heat generation of the fuel pump is reduced, thereby increasing the service life of the pump.

Claims

1. An integrated electronic fuel pump with oil immersed in the motor cavity, characterized in that: The invention comprises a pump body, a motor and a driver (10) integrated into an integrated structure; wherein the motor is an inner cavity oil-immersed motor, the pump body comprises a driving gear (1), a driven gear (2) and a pump cover (3), the motor housing of the motor and the pump base (4) are of the same structure, the driving gear (1) and the driven gear (2) are arranged between the pump cover (3) and the pump base (4), the driving gear (1) is connected to the rotor (5) of the motor, and the fuel medium enters the inner cavity of the motor through the rotor through-hole; the driver (10) is installed at the other end of the motor.

2. The motor cavity oil-immersed integrated electronic fuel pump according to claim 1, characterized in that: The rotor (5) is installed in the pump base (4) through a first bearing (6) and a second bearing (7), and both the first bearing (6) and the second bearing (7) are provided with oil passages.

3. The motor cavity oil-immersed integrated electronic fuel pump according to claim 1, characterized in that: The stator (9) of the motor and the pump base (4) are fixedly connected by solidifying glue.

4. The motor cavity oil-immersed integrated electronic fuel pump according to claim 3, characterized in that: The lead wire of the stator (9) passes through the solidified glue and is connected to the driver (10) arranged at the rear end of the motor.

5. The motor cavity oil-immersed integrated electronic fuel pump according to claim 4, characterized in that: An end cover (8) is installed on the other end of the pump base (4) corresponding to the pump body. A sealing structure is provided between the end cover (8) and the stator (9), and between the end cover (8) and the pump base (4); and a driver (10) is provided outside the end cover (8).

6. The motor cavity oil-immersed integrated electronic fuel pump according to claim 5, characterized in that: The rear end of the motor, the end cover (8) and the driver (10) are further provided with a rear cover (11).

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