Miniature electric fuel pump

Abstract

The invention provides a miniature electric fuel pump, relates to the technical field of electric pumps, and solves the technical problems of large size and low integration in the prior art. The device comprises a pump, a motor and a controller, the pump is in threaded connection with one end of the motor, the controller is in threaded connection with the other end of the motor, a pump cover of the pump and a motor cover of the motor are of an integrated structure, a cover plate of the controller and a stator assembly of the motor are of an integrated structure, and a driving shaft of the pump and a rotor assembly of the motor are of an integrated structure. According to the arrangement mode, the internal space is utilized to the maximum extent, the size is reduced, the size of the miniature electric fuel pump is reduced as much as possible, and the integration degree is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of electric pumps, in particular to a micro electric fuel pump. Background Art

[0002] The fuel pump is a crucial component in the powertrain of an aircraft engine. Its primary function is to pressurize the fuel in the aircraft's fuel tank, delivering it to the engine's combustion chamber at a constant flow rate and pressure, thereby ensuring fuel supply for engine ignition and operation. An electric fuel pump typically consists of a pump, motor, controller, and cables. The motor and pump are integrated and sealed with an oil seal. The controller is a separate component connected to the motor by a cable. Aircraft have very strict requirements for the size and weight of onboard equipment. As the industry evolves, traditional electric fuel pumps, with their large size and low integration, are unable to meet new demands. Summary of the Invention

[0003] The present invention aims to provide a micro electric fuel pump that solves the problems of large size and low integration in the prior art. The various technical effects that can be achieved by the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: The micro electric fuel pump provided by the present invention includes a pump, a motor and a controller. The pump is connected to one end of the motor by a thread, and the controller is connected to the other end of the motor by a thread. The pump cover of the pump and the motor cover of the motor are an integrated structure, the cover plate of the controller and the stator assembly of the motor are an integrated structure, and the driving shaft of the pump and the rotor assembly of the motor are an integrated structure.

[0005] Preferably, the pump includes a pump casing, a pump cover, a fixing screw, a driving gear, a driven gear, a driving shaft, a driven shaft and a first sliding bearing. The pump casing is connected to the pump cover by the fixing screw. There is a setting space inside the pump casing and the pump cover. The driving gear, the driven gear, the driven shaft, the driving shaft and the first sliding bearing are all arranged in the setting space. The driving gear is connected to the driving shaft, and the driving shaft is rotatably arranged in the setting space through the first sliding bearing. The driving gear is meshed with the driven gear, and the driven gear is connected to the driven shaft. The driven shaft is rotatably arranged in the setting space through the first sliding bearing.

[0006] Preferably, the pump further comprises an oil inlet and an oil outlet, and the oil inlet and the oil outlet are both arranged at an end of the pump housing away from the pump cover.

[0007] Preferably, a first external thread is provided on the circumference of the pump cover, an annular bulge is provided on one end of the pump cover facing the motor, a sealing ring is provided on the annular bulge, and the stator assembly is provided with a first internal thread. The stator assembly and the pump cover are connected through the first external thread and the first internal thread, and the stator assembly and the annular bulge are sealed and connected through a sealing ring.

[0008] Preferably, the motor includes a stator assembly, a sealing sleeve, a rotor assembly and a second sliding bearing. The sealing sleeve is a cylindrical structure, the sealing sleeve is arranged in the stator assembly, and the rotor assembly is arranged in the sealing sleeve. One end of the rotor assembly is an integral structure with the driving shaft, and the other end is rotatably connected to the sealing sleeve through the second sliding bearing.

[0009] Preferably, spiral grooves are provided on the inner walls of the first sliding bearing and the second sliding bearing on the driving shaft, the spiral grooves are connected to the main oil channel, a gap is left between the rotor assembly and the sealing sleeve, a through hole is provided inside the rotor assembly, the through hole passes through the rotor assembly in the axial direction, and the spiral grooves, the gap and the through hole form a cooling channel.

[0010] Preferably, the controller includes a shell, a drive board assembly, a control board assembly, a power board assembly and a bracket. The shell is a cylindrical body. The drive board assembly, the control board assembly and the power board assembly are all arranged inside the shell through the bracket. The open end of the shell has a second internal thread, and the end of the stator assembly facing the controller has a second external thread. The shell and the stator assembly are connected through the second internal thread and the second external thread.

[0011] Preferably, the wire outlet of the controller is coaxial with the second internal thread.

[0012] Preferably, the pump, the motor and the controller are all cylindrical structures.

[0013] This application adopts the above technical solution, which has at least the following beneficial effects: A micro electric fuel pump includes a pump, a motor, and a controller. The pump is connected to the motor at one end by a threaded connection, and the controller is connected to the motor at the other end by a threaded connection. The threaded connection maximizes the use of internal space, eliminates the need for cables between the motor and the controller, and saves cable space. The pump cover and the motor cover are integrated into one structure, reducing the length of the motor. The controller cover and the motor stator assembly are integrated into one structure, reducing the length of the controller. The pump drive shaft and the motor rotor assembly are integrated into one structure, avoiding the increase in size caused by the connection between the two shafts. The above technical solution is adopted in this application to maximize the use of the internal space of the pump and controller, shorten the overall size of the micro electric fuel pump, and minimize the volume of the micro electric fuel pump, making it more integrated.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic cross-sectional view of a micro electric fuel pump provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of a micro electric fuel pump provided by an embodiment of the present invention; Figure 3 1 is a schematic diagram of the sliding bearing structure of a micro electric fuel pump provided by an embodiment of the present invention; Figure 4 The figure is a schematic diagram of the flow direction structure of the internal cooling channel of the micro electric fuel pump provided by an embodiment of the present invention.

[0017] In the figure, 1 is the pump; 2 is the motor; 3 is the controller; 4 is the pump casing; 5 is the pump cover; 6 is the fixing screw; 7 is the driving gear; 8 is the driven gear; 9 is the driving shaft; 10 is the driven shaft; 11 is the first sliding bearing; 12 is the oil inlet; 13 is the oil outlet; 14 is the annular convex; 15 is the sealing ring; 16 is the stator assembly; 17 is the sealing sleeve; 18 is the rotor assembly; 19 is the second sliding bearing; 20 is the spiral groove; 21 is the gap; 22 is the through hole; 23 is the casing; 24 is the drive board assembly; 25 is the control board assembly; 26 is the power board assembly; 27 is the bracket; 28 is the outlet. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0019] The specific embodiment of the present invention provides a micro electric fuel pump, as shown in the attached Figure 1 and attached Figure 2 As shown, it mainly includes a pump 1, a motor 2 and a controller 3, wherein the pump 1 is connected to one end of the motor 2 by a thread, and the controller 3 is connected to the other end of the motor 2 by a thread. The threaded connection is a local extension connection method, which can make full use of the internal space, and the threaded connection between the controller 3 and the motor 2 eliminates the cable between the motor and the controller, saving cable space. The pump cover 5 of the pump 1 and the motor cover of the motor 2 are an integrated structure, that is, a structure is used to replace the original pump cover 5 and motor cover, as shown in the attached figure. Figure 1 The pump cover 5 shown in the figure replaces the original pump cover and motor cover. This approach reduces the length of the motor. The cover of the controller 3 and the stator assembly 16 of the motor 2 are integrated. This approach reduces the length of the controller and similarly reduces the overall length of the micro electric fuel pump. The driving shaft 9 of the pump 1 and the rotor assembly 18 of the motor 2 are integrated, avoiding the increase in size caused by the docking of the two shafts. The above-mentioned technical solution used in this application can maximize the internal space of the pump and controller, shorten the overall size of the micro electric fuel pump, and minimize the volume of the micro electric fuel pump, making it more integrated.

[0020] In the specific embodiments of this application, Figure 1 As shown, the pump 1 includes a pump casing 4, a pump cover 5, a fixing screw 6, a driving gear 7, a driven gear 8, a driving shaft 9, a driven shaft 10 and a first sliding bearing 11, wherein the pump casing 4 and the pump cover 5 are connected by a fixing screw 6, and the pump casing 4 and the pump cover 5 are buckled together to form a setting space therein, the driving gear 7, the driven gear 8, the driven shaft 10, the driving shaft 9 and the first sliding bearing 11 are all arranged in the setting space, the driving gear 7 is connected to the driving shaft 9, the driving shaft 9 is rotatably arranged in the setting space through the first sliding bearing 11, both ends of the driving shaft 9 are connected to the setting space through the first sliding bearing 11, the driving shaft 9 and the rotor assembly 18 of the motor 2 are an integral structure, the driving gear 7 is meshed with the driven gear 8, the driven gear 8 is connected to the driven shaft 10, the driven shaft 10 is rotatably arranged in the setting space through the first sliding bearing 11, and both ends of the driven shaft 10 are rotatably arranged in the setting space through the first sliding bearing 11.

[0021] The specific pump 1 also includes an oil inlet 12 and an oil outlet 13. The oil inlet 12 and the oil outlet 13 are both arranged at the end of the pump housing 4 away from the pump cover 5. The side where the driving gear 7 and the driven gear 8 are meshed is connected to the oil inlet 12, and the other side is connected to the oil outlet 13, forming a main oil channel for the pump oil.

[0022] In some embodiments, a first external thread is provided on the circumference of the pump cover 5, an annular protrusion 14 is provided on the end of the pump cover 5 facing the motor 2, a sealing ring 15 is provided on the annular protrusion 14, and a stator assembly 16 is provided with a first internal thread. The stator assembly 16 is connected to the pump cover 5 through the first external thread and the first internal thread. In this way, the connection method of the large-diameter thread is adopted to maximize the utilization of the internal space. The stator assembly 16 is sealed and connected to the annular protrusion 14 through the sealing ring 15. Specifically, the sealing sleeve 17 is sealed and connected to the annular protrusion 14 through the sealing ring 15.

[0023] In some embodiments, the motor 2 includes a stator assembly 16, a sealing sleeve 17, a rotor assembly 18 and a second sliding bearing 19. The sealing sleeve 17 is a cylindrical structure. The sealing sleeve 17 is arranged in the stator assembly 16, and the rotor assembly 18 is arranged in the sealing sleeve 17. The open end of the sealing sleeve 17 faces the pump cover 5. One end of the rotor assembly 18 is an integral structure with the driving shaft 9, and the other end of the rotor assembly 18 is rotatably connected to the sealing sleeve 17 through the second sliding bearing 19, and a gap is left between the end face of the rotor assembly 18 and the sealing sleeve 17.

[0024] In some embodiments, the Figure 4As shown, the inner walls of the first sliding bearing 11 and the second sliding bearing 19 on the driving shaft 9 are both provided with a spiral groove 20, which runs through both ends of the first sliding bearing 11 and the second sliding bearing 19. The fuel delivered by the meshing of the driving gear 7 and the driven gear 8 can enter the spiral groove 20 and be delivered through the spiral groove 20. The spiral groove 20 on the first sliding bearing 11 is connected to the main oil channel. The oil delivered in the main oil channel can enter this spiral groove 20. Due to the rotation of the rotor assembly 18 and the driving shaft 9, the oil can enter the motor 2 through the first sliding bearing 11, and the rotor in the motor 2 A gap 21 is left between the assembly 18 and the sealing sleeve 17. The oil will continue to move through the gap 21 to the second sliding bearing 19 at the other end of the rotor assembly 18, passing through the spiral groove 20 in the second sliding bearing 19. The rotor assembly 18 in this application is provided with a through hole 22 inside. The through hole 22 runs through the axial direction of the rotor assembly 18. The spiral groove 20, the gap 21 and the through hole 22 form a cooling channel. In this way, the oil passing through the spiral groove 20 in the second sliding bearing 19 flows out from the other end of the driving shaft 9 after passing through the through hole 22, and flows into the main oil channel through the spiral groove 20 of the first sliding bearing 11 on the other side of the driving shaft 9. In this application, the first sliding bearing 11 and the second sliding bearing 19 with spiral grooves 20 on the inner wall are used to achieve rotational connection with the rotor assembly 18 and the driving shaft 9. This method realizes oil cooling and heat dissipation of the motor, which can improve the current density of the motor and does not require other additional mechanisms, thereby further reducing the size of the motor.

[0025] It should be noted that, since oil passes through the spiral groove 20 , the interior thereof will also play a lubricating role, and the spiral setting of the spiral groove 20 can cooperate with the rotation of the rotor assembly 18 and the driving shaft 9 to realize the driving of the oil.

[0026] In some embodiments, the Figure 1 As shown, the controller 3 includes a shell 23, a drive board assembly 24, a control board assembly 25, a power board assembly 26 and a bracket 27, wherein the shell 23 is a cylindrical body, and the drive board assembly 24, the control board assembly 25 and the power board assembly 26 are all arranged inside the shell 23 through the bracket 27. The drive board assembly 24, the control board assembly 25 and the power board assembly 26 are all PCB board assemblies, which are used to realize the function of controlling the drive motor 2. The controller of the drive motor is a basic function in the current prior art, so it will not be described in detail. The technical solution of the present application is to set a second internal thread at the open end of the shell 23 and to set a second external thread at the end of the stator assembly 16 facing the controller 3. The shell 23 and the stator assembly 16 are connected by the second internal thread and the second external thread, and the connection between the motor 2 and the controller 3 is realized by a threaded connection. This method is to eliminate the cable between the motor and the controller, saving cable space.

[0027] In some embodiments, the wire outlet 28 of the controller 3 is coaxial with the second internal thread. This approach can avoid wire misalignment caused by thread docking.

[0028] In some embodiments, the pump 1 , the motor 2 , and the controller 3 are all cylindrical structures. This structure can minimize the size of the micro electric fuel pump to the greatest extent, making it more integrated.

[0029] In the present invention, the terms "one embodiment," "some embodiments," "examples," "specific examples," "some examples," etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0030] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A micro electric fuel pump, characterized in that: It includes a pump, a motor and a controller. The pump is connected to one end of the motor through a thread, and the controller is connected to the other end of the motor through a thread. The pump cover of the pump and the motor cover of the motor are an integrated structure, the cover plate of the controller and the stator assembly of the motor are an integrated structure, and the driving shaft of the pump and the rotor assembly of the motor are an integrated structure.

2. The micro electric fuel pump according to claim 1, characterized in that: The pump includes a pump casing, a pump cover, a fixing screw, a driving gear, a driven gear, a driving shaft, a driven shaft and a first sliding bearing. The pump casing is connected to the pump cover by the fixing screw. There is a setting space inside the pump casing and the pump cover. The driving gear, the driven gear, the driven shaft, the driving shaft and the first sliding bearing are all arranged in the setting space. The driving gear is connected to the driving shaft, and the driving shaft is rotatably arranged in the setting space through the first sliding bearing. The driving gear is meshed with the driven gear, and the driven gear is connected to the driven shaft. The driven shaft is rotatably arranged in the setting space through the first sliding bearing.

3. The micro electric fuel pump according to claim 2, characterized in that: The pump further comprises an oil inlet and an oil outlet, wherein the oil inlet and the oil outlet are both arranged at one end of the pump housing away from the pump cover.

4. The micro electric fuel pump according to claim 2 or 3, characterized in that: The pump cover is provided with a first external thread in the circumference, and an annular bulge is provided at one end of the pump cover facing the motor, a sealing ring is provided on the annular bulge, and the stator assembly is provided with a first internal thread. The stator assembly and the pump cover are connected through the first external thread and the first internal thread, and the stator assembly and the annular bulge are sealed and connected through a sealing ring.

5. The micro electric fuel pump according to claim 2, characterized in that: The motor includes a stator assembly, a sealing sleeve, a rotor assembly and a second sliding bearing. The sealing sleeve is a cylindrical structure and is arranged in the stator assembly. The rotor assembly is arranged in the sealing sleeve. One end of the rotor assembly is an integral structure with the driving shaft, and the other end is rotatably connected to the sealing sleeve through the second sliding bearing.

6. The micro electric fuel pump according to claim 5, characterized in that: The inner walls of the first sliding bearing and the second sliding bearing on the driving shaft are both provided with spiral grooves, which are connected to the main oil channel. A gap is left between the rotor assembly and the sealing sleeve. A through hole is provided inside the rotor assembly, which penetrates the rotor assembly in the axial direction. The spiral grooves, the gap and the through hole form a cooling channel.

7. The micro electric fuel pump according to claim 5, characterized in that: The controller includes a shell, a drive board assembly, a control board assembly, a power board assembly and a bracket. The shell is a cylindrical body. The drive board assembly, the control board assembly and the power board assembly are all arranged inside the shell through the bracket. The open end of the shell has a second internal thread, and the end of the stator assembly facing the controller has a second external thread. The shell and the stator assembly are connected through the second internal thread and the second external thread.

8. The micro electric fuel pump according to claim 7, characterized in that: The wire outlet of the controller is coaxial with the second internal thread.

9. The micro electric fuel pump according to claim 1, characterized in that: The pump, the motor and the controller are all cylindrical structures.

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