CN214755880U

CN214755880U - Immersion type oil pump DC brushless motor controller sealing structure

Info

Publication number: CN214755880U
Application number: CN202120824715.4U
Authority: CN
Inventors: 罗丹; 吴蔚; 王农
Original assignee: Chengdu CAIC Electronics Co Ltd
Current assignee: Chengdu CAIC Electronics Co Ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-11-16
Anticipated expiration: 2031-04-21

Abstract

The utility model discloses a sealing structure of a dipping oil pump brushless DC motor controller, which comprises a shell, wherein an end cover is hermetically arranged in the shell, a terminal assembly is arranged on the end cover in a threaded manner, the terminal assembly comprises a sheath, a terminal and a glass body, and the sheath is provided with a plurality of terminals; the surface roughness of the contact positions of the shell, the end cover, the sheath and the sealing ring is more than or equal to Ra1.6; the sealing device is characterized in that an installation bearing platform abutted to the shell is arranged on one side, close to the shell, of the end cover, sealing installation grooves are formed in the upper side and the lower side of the installation bearing platform respectively, sealing installation grooves are formed in the side wall, close to the installation bearing platform, of the end cover, and sealing rings are arranged in the sealing installation grooves. The utility model discloses can block that the fuel enters into controller inner channel, stop the inefficacy that components and parts arouse after soaking because of the fuel of seepage in the controller to brushless DC motor controller's reliability has been guaranteed.

Description

Immersion type oil pump DC brushless motor controller sealing structure

Technical Field

The utility model belongs to the technical field of the aviation fuel pump, concretely relates to flooding formula oil pump direct current brushless motor controller seal structure.

Background

The full-dipping brushless direct current fuel pump is installed in a fuel tank in a full-dipping mode, a motor body needs fuel oil to enter the inside of the fuel tank to achieve lubrication and circulating heat dissipation of a bearing, a controller is used for driving a brushless motor to rotate for an electronic component and a control module, and if fuel oil enters the inside of the controller, the electronic component and the control module are caused to fail to cause product failure. Thus, the controller seal plays a crucial role in its reliability. The motor body is connected with the controller, and peripheral structure is metal material, uses the sealing washer to seal, and this sealing mode also is very mature technique, can ensure sealedly, and the sealed key of controller lies in the sealing of motor body and controller wire, and the wire outside insulating layer is fairly smooth, and aviation fuel's permeability is fairly strong, can't pass through conventional sealing modes such as adhesive, sealing washer and the wire is reliably sealed now.

The electronic component and the control module are completely encapsulated in the controller through the adhesive, so that fuel oil soaking can be avoided, however, if the electronic component and the control module are completely encapsulated in the controller, the heat dissipation of the component is not facilitated, the reliability of the component can be influenced, the controller does not have maintainability, and the manufacturing cost of products is greatly increased. Therefore, the problem of sealing the controller can be solved without affecting the reliability of the container in the controller.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flooding formula oil pump direct current brushless motor controller seal structure aims at solving above-mentioned problem.

The utility model discloses mainly realize through following technical scheme:

a sealing structure of a controller of an immersion type oil pump brushless DC motor comprises a shell, wherein the shell is fixedly connected with a motor body through a bolt; an end cover is hermetically arranged in the shell, a terminal assembly is arranged on the end cover in a threaded manner, and a sealing ring is arranged between the terminal assembly and the end cover; the wiring terminal assembly comprises a sheath, wiring terminals and a glass body, wherein the sheath is provided with a plurality of wiring terminals, the glass body is filled between the sheath and the wiring terminals, and the glass body is integrally formed by high-temperature sintering; connecting wires of the motor body and the controller are respectively welded on corresponding binding posts; an installation bearing platform abutted against the shell is arranged on one side, close to the shell, of the end cover, sealing installation grooves are formed in the upper side and the lower side of the installation bearing platform respectively, sealing installation grooves are formed in the side wall, close to the installation bearing platform, of the end cover, and sealing rings are arranged in the sealing installation grooves; the surface roughness of the contact positions of the shell, the end cover, the sheath and the sealing ring is more than or equal to Ra1.6.

The end cover improves the sealing area through the arrangement of the mounting bearing platform, the shell is connected with the motor body through the bolts, and meanwhile, the table bearing platform of the end cover is pressed to be in contact with the shell. The sealing installation groove that is perpendicular setting through adjacent side on installation cushion cap and the end cover has realized comprehensive sealed accepting, and sealed effect is good, has better practicality.

In the use process of the utility model, the motor body is a brushless direct current motor and can be immersed in aviation kerosene RP-3. The oil pump is installed in a dipping mode and is completely dipped into aviation kerosene RP-3. The controller is fixedly connected with the motor body through bolts, and the shell and the motor body are respectively provided with bolt mounting holes correspondingly for connecting the controller with the motor body and compressing the sealing ring to realize peripheral structural sealing. The shell, the end cover and the binding post assembly realize peripheral structure sealing through the sealing ring, the sheath, the binding post and the glass body are sintered into an integrated molding to form the binding post assembly through high temperature, and the connection wire sealing of the motor body and the controller is realized. The sealing structure can realize the sealing of the immersion type installation fuel pump controller, block the fuel from entering the internal channel of the controller, and prevent the failure of components in the controller caused by the leaked fuel after soaking, thereby ensuring the reliability of the brushless direct current motor controller.

In order to realize better the utility model discloses, furtherly, be provided with the installation screw hole on the end cover, the outside correspondence of sheath is provided with the external screw thread, the outside that the top of sheath is close to the end cover is provided with seal installation groove along circumference.

In order to realize better the utility model discloses, furtherly, be provided with the installation filling hole that is used for installing terminal and the vitreous body on the sheath, set up wire welding hole on the terminal, and both ends set up the inclined plane. The aperture d of the lead welding hole is determined by the diameter of a lead metal wire, and two ends of the binding post are provided with inclined planes, so that the lead welding is facilitated.

In order to better realize the utility model, furthermore, the outer diameter D2 of the binding post is 1.5mm-2mm smaller than the outer diameter D1 of the mounting filling hole; the length L of one side of the binding post extending out of the sheath is 3.5 mm. The terminal post length setting guarantees that both ends stretch out sheath A, B plane length L after the installation and generally is about 3.5 mm.

In order to better realize the utility model, furthermore, the coefficient of expansion of the vitreous body is the same as the coefficient of expansion of sheath, terminal, the preparation material of vitreous body is any one of DM305, DM308, DM320 glass powder, sheath, terminal are obtained by metal material preparation.

In order to better realize the utility model, furthermore, the preparation material of vitreous body is DM308 glass powder, just sheath, terminal are obtained by 4J29 iron nickel cobalt kovar alloy preparation. The metal material is 4J29 FeNiCo kovar alloy with 4.7 x 10 expansion coefficient^-6Because the sealing bonding force of the DM308 glass powder is stronger than that of other glass powder after sealing at the temperature of 4.8 multiplied by 10, DM308 is usually selected and the expansion coefficient of the DM308 is 4.8 multiplied by 10^-6The expansion coefficients of the metal material and the glass body are basically consistent, the tight combination of sintering and molding can be ensured, sealing is realized, the motor body and the controller lead are only required to be welded on corresponding binding posts, and the conduction of the motor lead can be realized because the binding posts are made of the metal material.

The utility model has the advantages that:

the utility model discloses a seal structure can realize the sealed of flooding formula installation fuel pump controller, blocks that the fuel enters into controller inner passage, stops in the controller components and parts and because of the inefficacy that arouses after the fuel of seepage soaks to brushless DC motor controller's reliability has been guaranteed. Meanwhile, when the controller breaks down, the controller can be decomposed for maintenance, and the maintainability of the product is improved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of a terminal assembly.

Wherein: 1. a terminal assembly; 2. a seal ring; 3. a housing; 4. a controller; 5. connecting a lead; 6. an end cap; 7. a motor body; 8. a glass body; 9. a binding post; 10. a sheath; 11. external thread, 12-bolt.

Detailed Description

Example 1:

a sealing structure of a controller of an immersion type oil pump brushless DC motor comprises a shell 3, wherein the shell 3 is fixedly connected with a motor body 7 through a bolt 12; an end cover 6 is hermetically arranged in the shell 3, a terminal assembly 1 is arranged on the end cover 6 in a threaded manner, and a sealing ring 2 is arranged between the terminal assembly 1 and the end cover 6; the wiring terminal assembly 1 comprises a sheath 10, wiring terminals 9 and a glass body 8, wherein the sheath 10 is provided with a plurality of wiring terminals 9, the glass body 8 is filled between the sheath 10 and the wiring terminals 9, and the glass body is integrally formed by high-temperature sintering; the motor body 7 and the connecting lead 5 of the controller 4 are respectively welded on the corresponding binding posts 9; the end cover is characterized in that an installation bearing platform abutted to the shell 3 is arranged on one side, close to the shell 3, of the end cover 6, sealing installation grooves are formed in the upper side and the lower side of the installation bearing platform respectively, sealing installation grooves are formed in the side wall, close to the installation bearing platform, of the end cover 6, sealing rings 2 are arranged in the sealing installation grooves, and the surface roughness of the contact positions of the shell 3, the end cover 6, the sheath 10 and the sealing rings 2 is larger than or equal to Ra1.6. The sealing ring 2 may be provided as an O-ring.

In the use process of the utility model, the motor body 7 is a brushless direct current motor and can be immersed in aviation kerosene RP-3. The oil pump is installed in a dipping mode and is completely dipped into aviation kerosene RP-3. The controller 4 is fixedly connected with the motor body 7 through bolts 12, and the shell 3 and the motor body 7 are respectively provided with a bolt 12 mounting hole correspondingly for connecting the controller 4 with the motor body 7 and compressing the sealing ring 2 to realize peripheral structure sealing. The shell 3, the end cover 6 and the terminal assembly 1 are sealed in a peripheral structure through the sealing ring 2, the sheath 10, the terminal 9 and the glass body 8 are sintered into the terminal assembly 1 through high temperature, and the connection of the motor body 7 and the controller 4 with the lead 5 is sealed. The sealing structure can realize the sealing of the immersion type mounting fuel pump controller 4, block the fuel from entering the internal channel of the controller 4, and prevent the failure of components in the controller 4 caused by the leaked fuel after soaking, thereby ensuring the reliability of the brushless direct current motor controller 4.

Example 2:

the embodiment is optimized on the basis of embodiment 1, the end cover 6 is provided with an installation threaded hole, the outer side of the sheath 10 is correspondingly provided with an external thread 11, and the top of the sheath 10 is provided with a sealing installation groove along the circumferential direction close to the outer side of the end cover 6.

Furthermore, the sheath 10 is provided with an installation filling hole for installing the binding post 9 and the glass body 8, the binding post 9 is provided with a lead welding hole, and two ends of the lead welding hole are provided with inclined planes. The aperture d of the lead welding hole is determined by the diameter of a lead metal wire, and two ends of the binding post 9 are provided with inclined planes, so that the lead welding is facilitated.

Further, the outer diameter D2 of the terminal post 9 is 1.5mm-2mm smaller than the outer diameter D1 of the mounting filling hole; the length L of the binding post 9 extending out of the sheath 10 is 3.5 mm. The length of the binding post 9 is set to ensure that the length L of the two ends of the binding post extending out of the plane of the sheath 10A, B is about 3.5mm after installation.

The utility model discloses a seal structure can realize the sealed of flooding formula installation fuel pump controller 4, blocks that the fuel enters into 4 inside passages of controller, stops the inefficacy that components and parts arouse after soaking because of the fuel of seepage in the controller 4 to brushless DC motor controller 4's reliability has been guaranteed. Meanwhile, when the controller 4 breaks down, the controller can be decomposed for maintenance, and the maintainability of the product is improved.

Other parts of this embodiment are the same as embodiment 1, and thus are not described again.

Example 3:

the embodiment is optimized on the basis of

embodiment

1 or 2, the expansion coefficient of the glass body 8 is the same as that of the sheath 10 and the terminal 9, the glass body 8 is made of any one of DM305, DM308 and DM320 glass powder, and the sheath 10 and the terminal 9 are made of metal materials.

Further, the glass body 8 is made of DM308 glass powder, and the sheath 10 and the terminal post 9 are both made of 4J29 kovar.

The metal material is 4J29 FeNiCo kovar alloy with 4.7 x 10 expansion coefficient^-6Because the sealing bonding force of the DM308 glass powder is stronger than that of other glass powder after sealing at the temperature of 4.8 multiplied by 10, DM308 is usually selected and the expansion coefficient of the DM308 is 4.8 multiplied by 10^-6The expansion coefficients of the metal material and the glass body 8 are basically consistent, the tight combination of sintering and molding can be ensured, sealing is realized, the wires of the motor body 7 and the controller 4 only need to be welded on the corresponding wiring terminals 9, and the conduction of the wires of the motor can be realized because the wiring terminals 9 are made of the metal material.

The rest of this embodiment is the same as

embodiment

1 or 2, and therefore, the description thereof is omitted.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims

1. The sealing structure of the controller of the immersion type oil pump brushless DC motor is characterized by comprising a shell (3), wherein the shell (3) is fixedly connected with a motor body (7) through a bolt (12); an end cover (6) is hermetically arranged in the shell (3), a terminal assembly (1) is arranged on the end cover (6) in a threaded manner, and a sealing ring (2) is arranged between the terminal assembly (1) and the end cover (6); the wiring terminal assembly (1) comprises a sheath (10), wiring terminals (9) and a glass body (8), wherein the sheath (10) is provided with a plurality of wiring terminals (9), the glass body (8) is filled between the sheath (10) and the wiring terminals (9), and the glass body (8) is integrally formed by high-temperature sintering; the motor body (7) and the connecting lead (5) of the controller (4) are respectively welded on the corresponding binding posts (9); an installation bearing platform abutted against the shell (3) is arranged on one side, close to the shell (3), of the end cover (6), sealing installation grooves are formed in the upper side and the lower side of the installation bearing platform respectively, sealing installation grooves are formed in the side wall, close to the installation bearing platform, of the end cover (6), and sealing rings (2) are arranged in the sealing installation grooves; the surface roughness of the contact positions of the shell (3), the end cover (6), the sheath (10) and the sealing ring (2) is more than or equal to Ra1.6.

2. The immersion type oil pump brushless DC motor controller sealing structure according to claim 1, characterized in that the end cap (6) is provided with a threaded mounting hole, the outer side of the sheath (10) is correspondingly provided with an external thread (11), and the top of the sheath (10) is provided with a seal mounting groove along the circumferential direction near the outer side of the end cap (6).

3. The immersion type oil pump brushless dc motor controller sealing structure according to claim 2, wherein the sheath (10) is provided with a mounting and filling hole for mounting the terminal (9) and the glass body (8), the terminal (9) is provided with a wire welding hole, and both ends are provided with slopes.

4. The immersion type oil pump brushless dc motor controller sealing structure according to claim 3, wherein the outer diameter D2 of the terminal post (9) is 1.5mm-2mm smaller than the outer diameter D1 of the installation filling hole; the length L of one side of the binding post (9) extending out of the sheath (10) is 3.5 mm.

5. An immersion type oil pump brushless dc motor controller sealing structure according to any one of claims 1-4, characterized in that the expansion coefficient of the glass body (8) is the same as that of the sheath (10) and the terminal (9), the material of the glass body (8) is any one of DM305, DM308 and DM320 glass powder, and the sheath (10) and the terminal (9) are made of metal material.

6. The impregnated oil pump brushless DC motor controller sealing structure according to claim 5, wherein the glass body (8) is made of DM308 glass powder, and the sheath (10) and the terminal post (9) are both made of 4J29 NiCovar.