A motor Hall and controller sealing structure for a double-axle electric fuel pump

Abstract

A motor Hall and controller sealing structure for a dual-axle electric fuel pump includes a housing and a printed circuit board assembly. The printed circuit board assembly includes a printed circuit board and a Hall arranged on the printed circuit board; the structure also includes a Hall cavity for mounting the printed circuit board assembly and a controller cavity for mounting the controller; a first cavity for mounting the armature and rotor assembly is provided on the housing; the right end of the first cavity is open, the left end is provided with a shaft support portion, the left end face of the shaft support portion is provided with an annular groove, and a cover plate seals the annular groove portion to form a closed Hall cavity. A second cavity is provided on the housing, and the second cavity is located below the first cavity; a lead hole is provided between the first and second cavities; a wiring assembly is provided on the lead hole for electrically connecting the lead wires of the armature to the connection wires of the controller, and the lead hole is sealed, and a bottom plate seals the opening of the second cavity to form a closed controller cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of motor sealing for an electric fuel pump, and in particular to a motor Hall and controller sealing structure for a double-axle extended electric fuel pump. Background Art

[0002] With the rapid development of the aviation industry in recent years, demand for electric fuel pumps has been increasing across various aircraft types. As a crucial component of aircraft fuel systems, electric fuel pumps perform crucial functions such as fuel supply, transfer, and heat dissipation, and are widely used in fuel systems of various engine types. The fully submerged electric motor, the core component of the electric fuel pump, provides power to the entire fuel system, enabling the pump to deliver fuel at a specified pressure and flow rate.

[0003] As a future development trend, fully oil-immersed brushless DC motors are gradually replacing brushed DC motors. They offer advantages such as high power density, long life, stable operation, and excellent electromagnetic compatibility, making them suitable for advanced aircraft. This brushless DC motor is designed to ensure that the electric fuel pump can stably supply fuel to the engine in various aircraft attitudes. However, due to its dual-axis output structure, the Hall effect element cannot be designed in the same cavity as the controller. Therefore, the mounting cavity positions for the Hall effect sensor and controller must be carefully designed. Therefore, it is crucial to determine the proper placement of the Hall effect sensor and controller mounting cavities to facilitate the arrangement of the two shafts on the dual-axis electric fuel pump motor rotor. Summary of the Invention

[0004] The main purpose of the present invention is to provide a motor Hall and controller sealing structure for a double-axle electric fuel pump, aiming to solve the above technical problems.

[0005] To achieve the above objectives, the present invention provides a motor Hall and controller sealing structure for a dual-axle electric fuel pump, comprising a housing and a printed circuit board assembly, wherein the printed circuit board assembly includes a printed circuit board and a Hall arranged on the printed circuit board; further comprising a Hall cavity for mounting the printed circuit board assembly and a controller cavity for mounting the controller;

[0006] The housing is provided with a first cavity for mounting the armature and rotor assembly; the right end of the first cavity is open, and the left end is provided with a shaft support portion, an annular groove is provided on the left end surface of the shaft support portion, and a cover plate is sealed on the annular groove portion to form a closed Hall cavity;

[0007] A second cavity is provided on the casing, and the second cavity is located below the first cavity; a lead hole is provided between the first cavity and the second cavity; a wiring assembly is provided on the lead hole for electrically connecting the lead wire of the armature with the connection wire of the controller, and the lead hole is covered, and the bottom plate covers the mouth of the second cavity to form a closed controller cavity.

[0008] Preferably, a first stepped sinking platform and a second stepped sinking platform are provided in sequence on the left end face of the shaft support portion; a front end cover is installed on the first stepped sinking platform; the cover plate is installed on the second stepped sinking platform; the annular groove is located on the bottom wall of the second stepped sinking platform, and a first sealing ring is respectively provided between the two sides of the annular groove and the cover plate.

[0009] Preferably, first sealing ring accommodating grooves are respectively provided on both sides of the annular notch portion, the first sealing ring is installed in the first sealing ring accommodating groove, and the thickness of the first sealing ring is greater than the depth of the first sealing ring accommodating groove.

[0010] Preferably, a positioning ring is provided on the right side surface of the cover plate, and the positioning ring is clamped in the annular groove.

[0011] Preferably, a plurality of Hall installation cavities are evenly distributed at the bottom of the annular groove, and the Hall is inserted in the Hall installation cavity; the inner wall of the Hall installation cavity is a thin-walled structure; and reinforcing ribs are formed between adjacent Hall installation cavities.

[0012] Preferably, the thickness T of the inner wall of the Hall installation cavity is 0.7-1.0 mm.

[0013] Preferably, the wiring assembly includes a cover body and wiring terminals arranged on the cover body; a glass sintered sealing structure is formed between the wiring terminals and the cover body.

[0014] Preferably, a circular boss is provided on the top surface of the cover body, and the circular boss is plugged into the lead-in hole; a second sealing ring is provided between the top surface of the cover body and the surface of the lead-in hole.

[0015] Preferably, the second sealing ring is installed in the second sealing ring accommodating groove, and the thickness of the second sealing ring is greater than the depth of the second sealing ring accommodating groove; the second sealing ring accommodating groove is arranged at the surface position of the lead hole opening.

[0016] Preferably, a third sealing ring is provided between the bottom plate and the mouth of the second cavity; a third sealing ring accommodating groove is provided on the surface of the bottom plate, and the thickness of the third sealing ring is greater than the depth of the third sealing ring accommodating groove.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0018] The present invention uses a first cavity on the casing to install the armature and rotor assembly, so that the shafts at both ends of the rotor assembly can extend from both ends of the first cavity. At the same time, a second cavity is provided, which, together with the base plate and the wiring assembly, forms a closed controller cavity for installing the controller. Since the first and second cavities are arranged in an upper and lower distributed structure, the controller cavity formed by the second cavity does not affect the arrangement of the shafts at both ends of the rotor assembly. In addition, by arranging the Hall cavity on the shaft support portion on the left side of the first cavity, after assembly, the annular Hall cavity and the shaft on the rotor assembly are coaxially arranged, which facilitates the tracking magnet on the shaft to trigger the Hall on the printed circuit board assembly. In the present invention, the Hall cavity and the controller cavity are separate structures and do not affect the arrangement of the two shafts of the rotor on the dual-axis electric fuel pump motor. This allows the dual-axis type motor to be equipped with two impellers or other loads at the same time, thereby achieving "dual drive" operation with the motor and controller immersed in fuel as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a diagram of the sealing structure of the motor Hall and controller for the double-axle electric fuel pump provided by the present invention;

[0021] Figure 2 Schematic diagram of the stator structure consisting of a housing and an armature in the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the printed circuit board assembly in the present invention;

[0023] Figure 4 Schematic diagram of the structure of the Hall cavity in the present invention;

[0024] Figure 5 A schematic diagram of the structure of the reinforcement ribs formed between adjacent Hall installation cavities in the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the controller cavity formed by sealing the second cavity in the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0027] Figure 8 for Figure 6 Enlarged view of point B in the middle;

[0028] Figure 9 Schematic diagram of the structure of the wiring assembly in the present invention;

[0029] Figure 10 Schematic diagram of the motor soaking in fuel.

[0030] Explanation of the accompanying figures: 1. Front cover; 2. Cover plate; 2-1. Positioning ring; 3. First sealing ring; 4. Printed circuit board assembly; 5. Stator assembly; 6. Rotor assembly; 7. Rear cover; 8. Casing; 8-1. First cavity; 8-2. Second cavity; 8-3. Shaft support; 8-4. First step sinking platform; 8-5. Second step sinking platform; 8-6. Annular groove; 8-7. Hall installation cavity; 8-8. Lead hole; 8-9. First sealing ring accommodating groove; 8-10. Second sealing ring accommodating groove; 9. Armature; 10. Printed circuit board; 11. Hall; 12. Wiring assembly; 13. Second sealing ring; 14. Third sealing ring; 15. Bottom plate; 15-1. Third sealing ring accommodating groove; 16. Wiring terminal; 17. Cover body; 17-1. Boss. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Combine Figure 1 、 Figure 2As shown, a motor Hall and controller sealing structure for a double-axle electric fuel pump includes a housing 8 and a printed circuit board assembly 4. The printed circuit board assembly 4 includes a printed circuit board 10 and a Hall 11 arranged on the printed circuit board 10; it also includes a Hall cavity for mounting the printed circuit board assembly 4 and a controller cavity for mounting the controller; a first cavity 8-1 for mounting the armature 9 and the rotor assembly 6 is provided on the housing 8; the right end of the first cavity 8-1 is open, and the left end is provided with a shaft support portion 8-3, and the left end surface of the shaft support portion 8-3 is provided with a shaft support portion 8-3. An annular groove 8-6 is provided, and the cover plate 2 covers the mouth of the annular groove 8-6 to form a closed Hall cavity; a second cavity 8-2 is provided on the housing 8, and the second cavity 8-2 is located below the first cavity 8-1; a lead hole 8-8 is provided between the first cavity 8-1 and the second cavity 8-2; a wiring assembly 12 is provided on the lead hole 8-8, which is used to electrically connect the lead wire of the armature 9 with the connection wire of the controller, and the lead hole 8-8 is covered, and the bottom plate 15 covers the mouth of the second cavity 8-2 to form a closed controller cavity.

[0035] After assembly of the dual-axle electric fuel pump motor, the stator structure formed by the housing 8 and armature 9 is mounted within the first cavity of the housing 8. One of the shafts of the rotor assembly 6 passes through the shaft support 8-3 and extends outside the housing 8. A rear end cap 7 is located at the open end of the first cavity 8-1 to support the other shaft of the rotor assembly 6. This shaft also passes through the rear end cap 7 and extends outside the housing 8. The shaft support 8-3 and rear end cap 7 provide support for the rotor assembly 6. The annular groove 8-6 and the cover plate 2 together form a sealed, annular Hall effect chamber. After assembly, the upper shaft of the rotor assembly 6 passes through this Hall effect chamber, allowing the tracking magnet on the shaft to trigger the Hall effect 11 on the printed circuit board assembly 4. The controller is mounted within the control chamber formed by the second cavity 8-2. Because the first and second cavities 8-1 and 8-2 are arranged vertically, the distribution of the Hall effect components and controller does not affect the arrangement of the shafts at either end of the rotor assembly.

[0036] Combine Figure 1 、 Figure 2As shown, the left end face of the shaft support portion 8-3 is provided with a first stepped platform 8-4 and a second stepped platform 8-5 in sequence; a front end cover 1 is installed on the first stepped platform 8-4; the cover plate 2 is installed on the second stepped platform 8-5; the annular groove 8-6 is located on the bottom wall of the second stepped platform 8-5, and a first sealing ring 3 is provided between the two sides of the mouth of the annular groove 8-6 and the cover plate 2. The front end cover 1 is provided to protect the internal structure. The second stepped platform 8-5 is provided at the same time, firstly, to facilitate the installation of the cover plate 2, and secondly, to distribute the first stepped platform 8-4 and the second stepped platform 8-5 to respectively install the front end cover 1 and the cover plate 2, so that a gap is formed between the front end cover 1 and the cover plate 2. The first sealing ring 3 can ensure the sealing between the cover plate 2 and the mouth of the annular groove 8-6. Furthermore, in this embodiment, first sealing ring receiving grooves 8-9 are provided on either side of the opening of annular groove 8-6. First sealing ring 3 is installed in first sealing ring receiving grooves 8-9. By utilizing the structure of first sealing ring receiving grooves 8-9, the installation of first sealing ring 3 is facilitated. When cover plate 2 is tightened with screws, the thickness of first sealing ring 3 is greater than the depth of first sealing ring receiving grooves 8-9, causing cover plate 2 to compress first sealing ring 3, thereby ensuring a good seal and preventing fuel from entering the Hall effect chamber.

[0037] Combine Figure 4 As shown, in this embodiment, a positioning ring 2-1 is provided on the right side of the cover plate 2. The positioning ring 2-1 is clamped in the annular groove 8-6 to position the cover plate 2 to prevent the cover plate 2 from being misaligned when tightening the screws, thereby affecting the sealing effect.

[0038] Combine Figure 3 As shown, in this embodiment, the Hall 11 is vertically soldered on the printed circuit board 10.

[0039] Combine Figure 2 、 Figure 4 and Figure 5 As shown, multiple Hall effect mounting cavities 8-7 are evenly distributed at the bottom of the annular groove 8-6. The Hall effect sensor 11 is inserted into each of these cavities, and the printed circuit board 10 is fixed to the bottom wall of the annular groove 8-6 via screws. The inner wall of the Hall effect mounting cavity 8-7 is a thin-walled structure; specifically, the thickness T of the inner wall of the Hall effect mounting cavity 8-7 is 0.7 to 1.0 mm. To ensure the strength of the thin-walled structure, reinforcing ribs are formed between adjacent Hall effect mounting cavities 8-7 to reinforce the thin-walled structure. This thin-walled structure reduces the distance between the Hall effect sensor 11 and the tracking magnet, ensuring proper triggering of the Hall effect signal.

[0040] Combine Figure 9As shown, the wiring assembly 12 includes a cover 17 and a terminal 16 mounted on the cover 17. A glass frit seal is formed between the terminal 16 and the cover 17. A circular boss 17-1 is provided on the top surface of the cover 17, which plugs into the lead hole 8-8. A second sealing ring 13 is positioned between the top surface of the cover 17 and the opening of the lead hole 8-8. The circular boss 17-1 provides excellent positioning, and the outer cylindrical surface of the circular boss 17-1 cooperates with the circumference of the lead hole 8-8 to provide a certain sealing and positioning effect.

[0041] Combine Figure 6 The second sealing ring 13 is installed in the second sealing ring receiving groove 8-10. The thickness of the second sealing ring 13 is greater than the depth of the second sealing ring receiving groove 8-10. The second sealing ring receiving groove 8-10 is located at the surface of the lead hole 8-8. The second sealing ring 13 is compressed by the cover 17 to achieve a sealing effect.

[0042] A third sealing ring 14 is provided between the bottom plate 15 and the mouth of the second cavity 8 - 2 ; a third sealing ring receiving groove 15 - 1 is provided on the surface of the bottom plate 15 , and the thickness of the third sealing ring 14 is greater than the depth of the third sealing ring receiving groove 15 - 1 .

[0043] In this embodiment, the first sealing ring 3, the second sealing ring 13 and the third sealing ring 14 are all made of

[0044] When the motor is immersed in fuel and working, the fuel flows in from the left end shaft extension and flows out from the right end shaft extension. Figure 10 As shown in the figure, when fuel flows in from the left side, it is blocked outside the Hall chamber by the sealing structure formed by the annular groove 8-6 of the cover plate 2. When fuel flows out from the right side, it is blocked outside the controller chamber by the sealing structure formed by the wiring assembly 12 and the lead hole 8-8. When fuel flows out from the outside, it is blocked outside the controller chamber by the sealing structure formed by the bottom plate 15 and the opening of the second cavity 8-2. This completes the design of the Hall and controller sealing structure.

[0045] In the present invention, end-face static sealing structures are adopted between the pairs of annular grooves 8-6 of the cover plate 2, the pairs of lead holes 8-8 of the cover body 17 on the wiring assembly 12, and the base plate 15 and the second cavity 8-2. At the same time, the glass sintered sealing structure of the wiring terminal 16 and the cover body 17 is utilized to form a closed Hall cavity and a controller cavity on the casing 8, thereby realizing the sealing of the Hall sensor and the controller. Through this sealing structure, the motor has the ability to work stably for a long time in a fuel environment.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A motor Hall and controller sealing structure for a double-axle electric fuel pump, comprising a housing (8) and a printed circuit board assembly (4), wherein the printed circuit board assembly (4) comprises a printed circuit board (10) and a Hall (11) arranged on the printed circuit board (10); characterized in that: It also includes a Hall cavity for mounting a printed circuit board assembly (4) and a controller cavity for mounting a controller; A first cavity (8-1) for mounting an armature (9) and a rotor assembly (6) is provided on the housing (8); the right end of the first cavity (8-1) is open, and the left end is provided with a shaft support portion (8-3); an annular groove (8-6) is provided on the left end surface of the shaft support portion (8-3); a cover plate (2) is sealed at the mouth of the annular groove (8-6) to form a closed Hall cavity; A second cavity (8-2) is provided on the housing (8), and the second cavity (8-2) is located below the first cavity (8-1); a lead hole (8-8) is provided between the first cavity (8-1) and the second cavity (8-2); a wiring assembly (12) is provided on the lead hole (8-8) for electrically connecting the lead wire of the armature (9) with the connection wire of the controller, and the lead hole (8-8) is covered, and a bottom plate (15) is covered on the opening of the second cavity (8-2) to form a closed controller cavity.

2. A motor Hall and controller sealing structure for a dual-axle electric fuel pump according to claim 1, characterized in that: A first stepped sunken platform (8-4) and a second stepped sunken platform (8-5) are sequentially provided on the left end surface of the shaft support portion (8-3); a front end cover (1) is installed on the first stepped sunken platform (8-4); the cover plate (2) is installed on the second stepped sunken platform (8-5); an annular groove (8-6) is located on the bottom wall of the second stepped sunken platform (8-5), and first sealing rings (3) are respectively provided between the two sides of the annular groove (8-6) and the cover plate (2).

3. A motor Hall and controller sealing structure for a dual-axle electric fuel pump according to claim 2, characterized in that: First sealing ring accommodating grooves (8-9) are respectively provided on both sides of the opening of the annular groove (8-6), the first sealing ring (3) is installed in the first sealing ring accommodating groove (8-9), and the thickness of the first sealing ring (3) is greater than the depth of the first sealing ring accommodating groove (8-9).

4. The sealing structure of a motor Hall and controller for a dual-axle electric fuel pump according to claim 1, characterized in that: A positioning ring (2-1) is provided on the right side of the cover plate (2), and the positioning ring (2-1) is clamped in the annular groove (8-6).

5. The sealing structure of a motor Hall and controller for a double-axle electric fuel pump according to claim 1, characterized in that: A plurality of Hall installation cavities (8-7) are evenly distributed at the bottom of the annular groove (8-6), and the Hall (11) is inserted into the Hall installation cavity (8-7); the inner side wall of the Hall installation cavity (8-7) is a thin-walled structure; and reinforcing ribs are formed between adjacent Hall installation cavities (8-7).

6. A motor Hall and controller sealing structure for a dual-axle electric fuel pump according to claim 5, characterized in that: The thickness T of the inner wall of the Hall installation cavity (8-7) is 0.7-1.0 mm.

7. The sealing structure of a motor Hall and controller for a dual-axle electric fuel pump according to claim 1, characterized in that: The wiring assembly (12) comprises a cover body (17) and a wiring terminal (16) arranged on the cover body (17); a glass sintered sealing structure is formed between the wiring terminal (16) and the cover body (17).

8. The sealing structure of a motor Hall element and controller for a dual-axle electric fuel pump according to claim 7, characterized in that: A circular boss (17-1) is provided on the top surface of the cover body (17), and the circular boss (17-1) is plugged into the lead hole (8-8); a second sealing ring (13) is provided between the top surface of the cover body (17) and the opening surface of the lead hole (8-8).

9. A motor Hall and controller sealing structure for a dual-axle electric fuel pump according to claim 8, characterized in that: The second sealing ring (13) is installed in the second sealing ring accommodating groove (8-10), and the thickness of the second sealing ring (13) is greater than the depth of the second sealing ring accommodating groove (8-10); the second sealing ring accommodating groove (8-10) is arranged at the surface position of the lead hole (8-8) hole opening.

10. The motor Hall and controller sealing structure for a dual-axle electric fuel pump according to claim 1, characterized in that: A third sealing ring (14) is provided between the bottom plate (15) and the mouth of the second cavity (8-2); a third sealing ring accommodating groove (15-1) is provided on the surface of the bottom plate (15), and the thickness of the third sealing ring (14) is greater than the depth of the third sealing ring accommodating groove (15-1).

Images