CN216356372U - Grounding device and motor shaft assembly - Google Patents

Abstract

The application relates to a grounding device and a motor shaft assembly, which at least comprise two grounding assemblies, wherein the grounding assemblies are used for being electrically connected with a motor shaft to form at least two grounding paths, and the at least two grounding paths are connected in parallel. At least two grounding paths are arranged in parallel, so that the conductive capacity of the grounding device can be improved, the risk of electric corrosion damage of the motor shaft and the motor bearing caused by current is reduced, and the safety of the motor shaft and the motor bearing is improved. When the grounding device works, if a grounding part on any grounding path fails due to aging or abrasion and the like, so that the grounding path can not ground the shaft current, the shaft current can be grounded through other grounding paths connected with the grounding path in parallel, so that the grounding device can normally work, the service life and the reliability of the grounding device are improved, the risk of electric corrosion damage of a motor shaft and a motor bearing caused by the shaft current is further reduced, and the safety of the motor shaft and the motor bearing is further improved.

Description

Grounding device and motor shaft assembly

Technical Field

The application relates to the technical field of motors, in particular to a grounding device and a motor shaft assembly.

Background

In the working process of the motor, a motor shaft rotates, voltage is generated in the rotation process of the motor shaft under the normal condition, when the shaft voltage in the motor is greater than the breakdown voltage of bearing grease, electric arcs can be generated in a motor bearing, electric discharge is carried out along a path with the minimum resistance between the motor bearing and the motor shaft, the motor bearing is damaged by electric erosion spots, grooves and the like, and the bearing fails in long-term discharge. To avoid the above problems, it is common to provide a grounding device in the motor shaft assembly, which forms a grounding path for grounding the shaft current of the motor shaft. However, when the conductive member of the grounding device is damaged, the shaft current of the motor shaft cannot be grounded, that is, the reliability of the grounding device is low, thereby causing the motor bearing to fail.

SUMMERY OF THE UTILITY MODEL

The application provides a grounding device and a motor shaft assembly, which are electrically connected with a motor shaft by arranging a plurality of grounding assemblies to form a plurality of parallel grounding paths, so that the grounding reliability of the grounding device can be greatly improved.

A first aspect of the present application provides a grounding device comprising at least two grounding assemblies for electrical connection with a motor shaft to form at least two grounding paths, wherein at least two of the grounding paths are connected in parallel.

In the above scheme, at least two grounding paths of the grounding device are arranged in parallel, so that the grounding impedance of the grounding device can be reduced, and the conductivity of the grounding device is improved, so that more shaft current in the motor shaft flows to the outside of the motor shaft, the risk of electric erosion damage of the motor shaft and a motor bearing caused by the shaft current is reduced, and the safety of the motor shaft and the motor bearing is improved. When the grounding device works, if a grounding part on any grounding path (such as a first grounding path) fails due to aging or abrasion and the like, so that the shaft current cannot be grounded, the shaft current can be grounded through other grounding paths (such as a second grounding path) connected with the grounding path in parallel, so that the grounding device can work normally, the service life and the reliability of the grounding device are improved, the risk of electric erosion damage of a motor shaft and a motor bearing caused by the shaft current is further reduced, and the safety of the motor shaft and the motor bearing is further improved.

In one possible design, the grounding assembly at least comprises a first grounding assembly and a second grounding assembly, the first grounding assembly comprises a conductive seat, a carbon brush and a first conductive part, the conductive seat is used for being electrically connected with a motor shaft, the carbon brush is mounted on the conductive seat and is electrically connected with the conductive seat, and the first conductive part and the carbon brush can rotate relatively; the second grounding assembly comprises a second conductive part used for being electrically connected with a motor shaft, and the second conductive part is electrically connected with the first conductive part.

In the above scheme, the grounding device at least grounds the motor shaft through the first grounding assembly and the second grounding assembly simultaneously, so that the working reliability of the grounding device can be improved, and single failure is avoided.

In one possible design, the conductive socket, the carbon brush, and the first conductive member are arranged in an axial direction of a motor shaft; the second conductive member and the first conductive member are arranged in a radial direction of a motor shaft.

In the above scheme, the grounding device adopts two grounding paths, namely the axial grounding path (the first grounding path) and the radial grounding path (the second grounding path), which are connected in parallel, so that the grounding impedance of the grounding device can be reduced, the conductive capability of the grounding device on the motor shaft is improved, each conductive part in the axial grounding path can be arranged along the axial direction of the motor shaft, each conductive part in the radial grounding path can be arranged along the radial direction of the motor shaft, the arrangement of each conductive part is facilitated, the risk of interference of each conductive part in the two paths is reduced, the occupied space of the grounding device is reduced, and the grounding device is more convenient to install on the motor shaft.

In one possible design, the conductive seat is used for being fixedly connected with a motor shaft and the carbon brush, so that the conductive seat can drive the carbon brush to rotate.

In the above scheme, the conductive seat is fixedly connected with the carbon brush, so that the carbon brush can synchronously rotate along with the conductive seat, relative rotation is generated between the carbon brush and the first conductive assembly, the current is conducted through friction, the current flows to the first conductive assembly from the carbon brush, the axial grounding of the grounding device is realized, and the conductive capacity of the grounding device is further improved.

In one possible design, the first grounding assembly further includes a fastener for fastening carbon fibers of the carbon brush.

In the above scheme, through setting up the fastener, fasten the carbon fiber of carbon brush, the carbon fiber that will disperse into a root is fixed for a branch of to improve the conducting capacity of carbon brush, further improve the conducting capacity of first ground subassembly. Meanwhile, the fastened carbon fiber can be prevented from being damaged due to friction with the conductive seat in the rotating process.

In one possible design, the conductive seat comprises a base and a seat cover which are detachably connected, the base is provided with a mounting groove, a part of the carbon brush extends into the mounting groove, and the fastener is positioned in the mounting groove; the seat cover is used for being electrically connected and fixedly connected with a motor shaft.

In the above scheme, can dismantle the connection between base and the seat cover, conveniently realize the installation and the dismantlement of electrically conductive seat, when base and seat cover assemble, can closely cooperate, can not take place to drop, and can be convenient for install fastener and carbon brush, and make the mounting groove can closely cooperate with the outer wall of fastener, the inner wall of fastener can closely cooperate with the carbon brush simultaneously, make the fastener can stretch into the partly of mounting groove with the carbon brush and fix with the base, when the seat cover rotates along with the motor shaft, can drive base and inside fastener and carbon brush synchronous rotation, and all can not take place relative rotation between each other.

In one possible design, the first conductive component comprises an elastic sheet, one end of the elastic sheet is in contact with the carbon brush so that the elastic sheet and the carbon brush can rotate relatively, and the other end of the elastic sheet is used for grounding; the second conductive part is in contact with the elastic sheet.

In the above scheme, when first conductive part passes through the shell fragment and realizes, because the shell fragment can elastic deformation to can improve the connection reliability between shell fragment and the carbon brush, and make shell fragment and carbon brush can rotate relatively, reduce the risk that the two relative rotation in-process takes place to damage.

In one possible design, the spring plate includes a body portion that is in contact with the carbon brush, and an extension portion that extends radially outward relative to the body portion; the body portion is in contact with the second conductive member, and the extension portion and the conductive socket are located at both ends of the second conductive member in the axial direction of the motor shaft.

In the above scheme, the extension part and the conductive seat of the elastic sheet are positioned at two ends of the second conductive part, the second conductive part is limited along the axis direction of the motor shaft, the second conductive part is limited to play along the axis direction of the motor shaft, and the stability and the reliability of the grounding device are improved.

In a possible design, the first conductive part further includes a conductive sheet, one end of the conductive sheet is fixedly connected and electrically connected with the elastic sheet, and the other end of the conductive sheet is used for grounding.

In the above scheme, the conductive sheet is arranged so as to facilitate the connection between the elastic sheet and the grounding terminal.

In one possible design, the second conductive part is a conductive bearing or a conductive oil seal or a ground ring.

In the above scheme, the second conductive part is a conductive bearing or a conductive oil seal or a grounding ring, and is in radial contact with the elastic sheet along the motor shaft to connect the motor shaft and the elastic sheet, so that current on the motor shaft can flow into the elastic sheet along the radial direction of the motor shaft, and then flows to the conductive sheet, and the grounding device conducts electricity to the radial direction of the motor shaft.

The present application further provides a grounding device, the grounding device includes a first grounding assembly for electrically connecting with a motor shaft to form a first grounding path, wherein the first grounding path grounds the motor shaft in an axial direction of the motor shaft.

Among the above-mentioned scheme, through setting up first ground connection subassembly, form the first ground connection route along motor shaft axis direction ground connection, realize electrically conductive to the axial of motor shaft, reduce the axle current and lead to motor shaft and motor bearing to produce the risk of electric erosion damage, improve the security of motor shaft and motor bearing.

In one possible design, the first grounding assembly includes a conductive seat, a carbon brush and a first conductive component, the conductive seat is used for being electrically connected with a motor shaft, the carbon brush is mounted on the conductive seat and is electrically connected with the conductive seat, and the first conductive component and the carbon brush can rotate relatively; the conductive seat, the carbon brush, and the first conductive member are arranged in an axial direction of a motor shaft.

In the above scheme, the first grounding path extends along the axis direction of the motor shaft, so that the arrangement of each conductive part is facilitated, the space occupied by the first grounding assembly is reduced, and the grounding device is more convenient to mount on the motor shaft.

In one possible design, the grounding device further includes a second grounding assembly for electrically connecting with the motor shaft to form a second grounding path, wherein the second grounding path grounds the motor shaft in a radial direction of the motor shaft.

In the above-mentioned scheme, through setting up second ground connection subassembly, form along the radial grounded second ground connection route of motor shaft, realize leading to motor shaft and motor bearing to produce the risk of electric erosion damage to the radial electrically conductive of motor shaft, reduce the axle current, further improve the security of motor shaft and motor bearing.

In one possible design, the second grounding assembly includes a second conductive component for electrically connecting with the motor shaft, and the second conductive component is electrically connected with the first grounding assembly.

In the above scheme, when the second grounding assembly conducts electricity to the motor shaft, the shaft current flows from the motor shaft to the second conductive part electrically connected with the motor shaft, further flows to the first conductive part electrically connected with the second conductive part, and is grounded.

This application second aspect provides a motor shaft assembly, motor shaft assembly includes:

a motor shaft;

the grounding device is the grounding device;

wherein the grounding device is mounted on the motor shaft.

In one possible embodiment, the motor shaft is a hollow shaft, and the grounding device is mounted in the motor shaft.

In the above scheme, the grounding device is integrally installed in the hollow motor shaft without additionally occupying space, so that the whole space of the motor shaft assembly is saved.

In one possible design, the grounding device is mounted outside the motor shaft.

In the above scheme, the grounding device is installed on the outer side of the motor shaft, so that the grounding device is convenient to install and high in installation flexibility.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is a schematic diagram of a grounding path of a grounding device provided in an embodiment of the present application when the grounding device is mounted on a motor shaft;

FIG. 2 is a schematic view of the grounding device of FIG. 1 mounted on a motor shaft;

FIG. 3 is a schematic structural diagram of the first grounding assembly shown in FIG. 2;

fig. 4 is an exploded view of the conductive socket and the carbon brush of fig. 3;

fig. 5 is a schematic structural diagram of the second grounding assembly in fig. 2.

Reference numerals:

1-a first ground assembly;

11-a conductive seat;

111-seat cover;

112-a base;

112 a-a mounting groove;

12-a carbon brush;

13-a first conductive member;

131-a spring plate;

131 a-a body portion;

131 b-an extension;

132-a conductive sheet;

14-a fastener;

2-a second ground component;

21-a second conductive member;

3-motor shaft;

l1 — first ground path;

l2 — second ground path.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

In one embodiment, the present application is described in further detail below with reference to specific embodiments and accompanying drawings.

The present embodiment provides a grounding device that can be used to electrically connect with motor shaft 3 and conduct the shaft current of motor shaft 3. As shown in fig. 1, the grounding device includes at least two grounding assemblies for electrically connecting with the motor shaft 3 to form at least two grounding paths (including at least a first grounding path L1 and a second grounding path L2); wherein at least two ground paths are connected in parallel.

In this embodiment, at least two grounding paths of the grounding device are arranged in parallel, so that the grounding impedance of the grounding device can be reduced, and the conductivity of the grounding device can be improved, so that more shaft current in the motor shaft 3 flows to the outside of the motor shaft 3, the risk of electric erosion damage of the motor shaft 3 and a motor bearing caused by the shaft current is reduced, and the safety of the motor shaft 3 and the motor bearing is improved. When the grounding device is in operation, if a grounding component on any grounding path (for example, the first grounding path L1) fails due to aging or abrasion, and the grounding path cannot ground the shaft current, the shaft current can be grounded through another grounding path (for example, the second grounding path L2) connected in parallel with the grounding path, so that the grounding device can operate normally, the service life and reliability of the grounding device are improved, the risk of electric erosion damage of the motor shaft 3 and the motor bearing caused by the shaft current is further reduced, and the safety of the motor shaft 3 and the motor bearing is further improved.

In the embodiment shown in fig. 1, the grounding means comprises a first grounding path L1 and a second grounding path L2 arranged in parallel, wherein the grounding impedance of the grounding means is smaller than the grounding impedance of the first grounding path L1 and the grounding impedance of the second grounding path L2.

In a specific embodiment, as shown in fig. 1 and 2, the grounding assembly includes at least a first grounding assembly 1 and a second grounding assembly 2, the first grounding assembly 1 includes a conductive socket 11, a carbon brush 12 and a first conductive component 13, the conductive socket 11 is used for electrically connecting with the motor shaft 3, the carbon brush 12 is mounted on the conductive socket 11 and electrically connected with the conductive socket 11, and the first conductive component 13 and the carbon brush 12 are capable of rotating relatively; the second grounding assembly 2 includes a second conductive member 21 for electrical connection with the motor shaft 3, and the second conductive member 21 is electrically connected with the first conductive member 13.

In this embodiment, the conductive socket 11, the carbon brush 12 and the first conductive component 13 form at least part of the first grounding path L1, when the first grounding assembly 1 conducts electricity to the motor shaft 3, the shaft current flows from the motor shaft 3 to the conductive socket 11 electrically connected thereto, and further flows to the carbon brush 12 electrically connected to the conductive socket 11, the carbon brush 12 and the first conductive component 13 can rotate relatively, and the current flows from the carbon brush 12 to the first conductive component 13 through friction during the relative rotation of the two components, and is grounded; the second conductive member 21 and the first conductive member 13 form at least a part of the second ground path L2, and when the second ground assembly 2 conducts electricity to the motor shaft 3, the shaft current flows from the motor shaft 3 to the second conductive member 21 electrically connected thereto, further flows to the first conductive member 13 electrically connected to the second conductive member 21, and is grounded. Therefore, the grounding device in this embodiment grounds the motor shaft 3 through at least the first grounding assembly 1 and the second grounding assembly 2, so as to improve the working reliability of the grounding device and avoid single failure.

In a specific embodiment, as shown in fig. 2, the conductive socket 11, the carbon brush 12, and the first conductive member 13 are arranged in the axial direction of the motor shaft 3; the second conductive member 21 and the first conductive member 13 are arranged in the radial direction of the motor shaft 3.

In this embodiment, the conductive socket 11, the carbon brush 12 and the first conductive component 13 conduct electricity to the motor shaft 3 along the axial direction of the motor shaft 3, so as to achieve axial grounding of the grounding device, that is, the first grounding path L1 extends along the axial direction of the motor shaft 3; the second conductive member 21 and the first conductive member 13 conduct electricity to the motor shaft 3 in the radial direction of the motor shaft 3, and the radial grounding of the grounding device is achieved, i.e., the above-mentioned second grounding path L2 extends in the radial direction of the motor shaft 3. Therefore, the grounding device in this embodiment adopts two grounding paths, namely, the axial grounding path (the first grounding path L1) and the radial grounding path (the second grounding path L2), which are connected in parallel, so that the grounding impedance of the grounding device can be reduced, and the conductive capability of the grounding device to the motor shaft 3 can be improved, and each conductive component in the axial grounding path can be arranged along the axial direction of the motor shaft 3, and each conductive component in the radial grounding path can be arranged along the radial direction of the motor shaft 3, so that the arrangement of each conductive component is facilitated, the risk of interference between each conductive component in the two paths is reduced, the space occupied by the grounding device is reduced, and the grounding device is more conveniently mounted on the motor shaft 3.

In a specific embodiment, as shown in fig. 2 and 3, the conductive socket 11 is configured to be fixedly connected to the motor shaft 3 and fixedly connected to the carbon brush 12, so that the conductive socket 11 can drive the carbon brush 12 to rotate, and at this time, the first conductive component 13 is in a stationary state, so that the carbon brush 12 can rotate relative to the first conductive component 13.

In this embodiment, the conductive seat 11 can be fixed on the motor shaft 3 and can rotate synchronously with the motor shaft 3 without falling off. The conductive seat 11 is fixedly connected with the carbon brush 12, so that the carbon brush 12 can synchronously rotate along with the conductive seat 11, and therefore the first conductive component 13 rotates relatively, electric current flows from the carbon brush 12 to the first conductive component 13 through friction conduction, axial grounding of the grounding device is achieved, and the conductive capacity of the grounding device is improved.

Wherein, can interference fit between electrically conductive seat 11 and the motor shaft 3 to realize the fixed connection between electrically conductive seat 11 and the motor shaft 3, perhaps, also can realize connecting through other modes between the two, for example joint, pin joint etc..

Or, the relative rotation between the carbon brush 12 and the first conductive part 13 can also be realized by the rotation of the first conductive part 13 and the non-rotation of the carbon brush 12, at this time, the first conductive part 13 can be driven by the motor shaft 3 to rotate, the conductive base 11 and the motor shaft 3 are not fixed, so that the two parts can rotate relatively, and in the rotation process of the motor shaft 3, the conductive base 11 does not rotate, so that the carbon brush 12 installed on the conductive base 11 does not rotate. However, when the relative rotation between the carbon brush 12 and the first conductive member 13 is realized by the rotation of the carbon brush 12 and the non-rotation of the first conductive member 13, the structure of the grounding device can be simplified.

In a specific embodiment, as shown in fig. 3, the first grounding assembly 1 further includes a fastener 14, and the fastener 14 is used for fastening the carbon fiber of the carbon brush 12.

In this embodiment, the fastening member 14 is provided to fasten the carbon fibers of the carbon brush 12, and the carbon fibers dispersed into one carbon fiber bundle are fixed, so that the conductive capability of the carbon brush 12 is improved, and the conductive capability of the first grounding assembly 1 is further improved. Meanwhile, the fastened carbon fiber can be prevented from being damaged due to friction with the conductive seat 11 in the rotating process.

As shown in fig. 3, one end of the carbon brush 12 can be fitted into the fastener 14, so that the carbon fiber of the carbon brush 12 is fastened by the fastener 14.

Specifically, as shown in fig. 2 and 4, the conductive socket 11 includes a base 112 and a socket 111 detachably connected, the base 112 has a mounting groove 112a, a portion of the carbon brush 12 extends into the mounting groove 112a, the fastener 14 is located in the mounting groove 112a, and the socket 111 is used for electrically and fixedly connecting with the motor shaft 3.

In this embodiment, the base 112 and the seat cover 111 are detachably connected, the installation and the disassembly of the conductive seat 11 are conveniently realized, when the base 112 and the seat cover 111 are assembled, the base 112 and the seat cover can be tightly matched, the base does not fall off, the installation of the fastening piece 14 and the carbon brush 12 can be facilitated, the installation groove 112a can be tightly matched with the outer wall of the fastening piece 14, the inner wall of the fastening piece 14 can be tightly matched with the carbon brush 12, the part of the carbon brush 12 extending into the installation groove 112a can be fixed with the base 112 by the sealing fastening piece 14, when the seat cover 111 rotates along with the motor shaft 3, the base 112 and the fastening piece 14 and the carbon brush 12 inside the base 112 can be driven to synchronously rotate, and relative rotation cannot occur between the base 112 and the seat cover 111.

The seat cover 111 and the base 112 may be connected by a snap connection, a screw connection, or the like. The socket 111 is internally provided with a groove, so that grease entering the conductive seat 11 can be stored by the groove and cannot flow into the socket 111 to contact the carbon brush 12, a sealed oil-separating environment inside the conductive seat 11 is ensured, and the conductive capability of the carbon brush 12 is further improved.

In a specific embodiment, as shown in fig. 2, the first conductive component 13 includes a spring sheet 131, one end of the spring sheet 131 is in contact with the carbon brush 12 to enable the spring sheet 131 and the carbon brush 12 to rotate relatively, the other end is used for grounding, and the second conductive component 21 is in contact with the spring sheet 131.

In this embodiment, one end of the elastic sheet 131 is in close contact with the carbon brush 12, and friction is generated by relative rotation between the carbon brush 12 and the elastic sheet 131, so that impedance between the elastic sheet 131 and the carbon brush 12 is reduced, and thus current in the conductive seat 11 flows to the elastic sheet 131 through the carbon brush 12, and the other end of the elastic sheet 131 is grounded, so that the grounding device grounds the motor shaft 3 through the first grounding path L1; the second conductive member 21 is in electrical communication with the resilient tab 131 through contact, and current in the second conductive member 21 flows to the resilient tab 131 and then flows out from the grounded end of the resilient tab 131, so that the grounding device grounds the motor shaft 3 through the second grounding path L2. Meanwhile, when the first conductive part 13 is implemented by the elastic sheet 131, the elastic sheet 131 can be elastically deformed, so that the connection reliability between the elastic sheet 131 and the carbon brush 12 can be improved, the elastic sheet 131 and the carbon brush 12 can relatively rotate, and the risk of damage to the elastic sheet 131 and the carbon brush 12 in the relative rotation process is reduced.

Specifically, as shown in fig. 2 and 5, the spring plate 131 includes a body portion 131a and an extension portion 131b, the body portion 131a is in contact with the carbon brush 12, and the extension portion 131b extends radially outward with respect to the body portion 131 a; the body portion 131a is in contact with the second conductive member 21, and the extended portion 131b and the conductive socket 11 are located at both ends of the second conductive member 21 in the axial direction of the motor shaft 3.

In this embodiment, the main body 131a of the spring piece 131 is in contact with the carbon brush 12 in the axial direction of the motor shaft 3, and is axially conductive by friction of relative rotation, while the main body 131a is in contact with the second conductive member 21 in the radial direction of the motor shaft 3, and is radially conductive. The extension part 131b of the elastic sheet 131 and the conductive seat 11 are located at two ends of the second conductive part 21, and limit the second conductive part 21 along the axial direction of the motor shaft 3, so as to limit the second conductive part 21 from moving along the axial direction of the motor shaft 3, and improve the stability and reliability of the grounding device.

In a specific embodiment, as shown in fig. 2 and 3, the first conductive part 13 further includes a conductive sheet 132, one end of the conductive sheet 132 is fixedly connected and electrically connected to the elastic sheet 131, and the other end is used for grounding.

In this embodiment, one end of the conducting plate 132 is inserted into the elastic plate 131, so that the current in the elastic plate 131 flows to the conducting plate 132, and the other end is grounded, so that the current of the motor shaft 3 is grounded through the conducting plate 132, thereby improving the conducting capability of the grounding device for the motor shaft 3. Therefore, the conductive sheet 132 can facilitate the connection between the elastic sheet 131 and the ground terminal.

The grounding end of the conducting plate 132 can be directly grounded, or can be fixed on the assembly supporting seat where the motor shaft 3 is located. Therefore, the size and shape of the conductive sheet 132 may be set according to the distance between the elastic sheet 131 and the ground terminal as long as the ground of the elastic sheet 131 can be achieved.

In a specific embodiment, as shown in fig. 2 and 5, the second conductive component 21 is a conductive bearing or a conductive oil seal or a ground ring.

In this embodiment, the second conductive part 21 is a conductive bearing, a conductive oil seal, or a ground ring, and contacts with the elastic sheet 131 along the radial direction of the motor shaft 3 to connect the motor shaft 3 and the elastic sheet 131, so that the current on the motor shaft 3 can flow into the elastic sheet 131 along the radial direction of the motor shaft 3, and then flow to the conductive sheet 132, thereby realizing the conduction of the grounding device to the radial direction of the motor shaft 3.

In the motor working process, in order to reduce the risk that the motor shaft generates voltage in the rotating process to cause damages such as electric corrosion spots and grooves on a motor bearing, a radial grounding device is usually arranged in the motor shaft assembly and is used for grounding the motor shaft through a conductive bearing, so that the voltage generated by the motor shaft is grounded along the radial direction of the motor shaft to form a grounding path for grounding the shaft current of the motor shaft. However, the conductive bearing of the radial grounding device is easily damaged during the rotation of the motor shaft, so that the shaft current of the motor shaft cannot be grounded, i.e., the radial grounding device has low reliability, thereby causing the failure of the motor bearing.

In order to solve the technical problem, the present embodiment provides another grounding device, as shown in fig. 3, which includes a first grounding assembly 1, the first grounding assembly 1 being used for electrically connecting with a motor shaft 3 to form a first grounding path L1, wherein the first grounding path L1 is used for grounding the motor shaft 3 along an axial direction of the motor shaft 3.

In this embodiment, the first grounding assembly 1 is electrically connected to the motor shaft 3, and conducts electricity along the axial direction of the motor shaft 3, so that a shaft current flows from the motor shaft 3 to the first grounding assembly 1, and flows to the outside of the motor shaft 3 along the grounding end of the first grounding assembly 1. Through setting up first ground connection subassembly 1, form the first ground connection route L1 along the ground connection of 3 axial directions of motor shaft, realize electrically conducting to motor shaft 3's axial, reduce the axle current and lead to motor shaft 3 and motor bearing to produce the risk of electric erosion damage, improve the security of motor shaft 3 and motor bearing.

In a specific embodiment, as shown in fig. 3, the first grounding assembly 1 includes a conductive base 11, a carbon brush 12 and a first conductive component 13, the conductive base 11 is used for electrically connecting with the motor shaft 3, the carbon brush 12 is mounted on the conductive base 11 and electrically connected with the conductive base 11, and the first conductive component 13 and the carbon brush 12 can rotate relatively; the conductive socket 11, the carbon brush 12, and the first conductive member 13 are arranged in the axial direction of the motor shaft 3.

In this embodiment, the conductive socket 11, the carbon brush 12 and the first conductive component 13 form at least part of the first grounding path L1, when the first grounding assembly 1 conducts electricity to the motor shaft 3, the shaft current flows from the motor shaft 3 to the conductive socket 11 electrically connected thereto, and further flows to the carbon brush 12 electrically connected to the conductive socket 11, the carbon brush 12 and the first conductive component 13 can rotate relatively, and the current flows from the carbon brush 12 to the first conductive component 13 through friction during the relative rotation of the two components, and is grounded; the conductive seat 11, the carbon brush 12 and the first conductive part 13 conduct electricity to the motor shaft 3 along the axial direction of the motor shaft 3, so that the axial grounding of the grounding device is realized, that is, the first grounding path L1 extends along the axial direction of the motor shaft 3, the arrangement of the conductive parts is convenient, the space occupied by the first grounding component 1 is reduced, and the grounding device is more convenient to install on the motor shaft 3.

The structures of the conductive seat 11, the carbon brush 12, the first conductive member 13, and the like in this embodiment are as described in the above embodiments, and are not described herein again.

In a specific embodiment, as shown in fig. 1 and 5, the grounding device further includes a second grounding assembly 2, the second grounding assembly 2 being adapted to be electrically connected to the motor shaft 3 to form a second grounding path L2, wherein the second grounding path L2 grounds the motor shaft 3 in a radial direction of the motor shaft 3.

In this embodiment, the second grounding assembly 2 is electrically connected to the motor shaft 3, and conducts electricity along the radial direction of the motor shaft 3, so that the shaft current flows from the motor shaft 3 to the second grounding assembly 2, and flows to the outside of the motor shaft 3 along the grounding end of the second grounding assembly 2. Through setting up second ground connection subassembly 2, form along the radial grounded second ground connection route L2 of motor shaft 3, realize radially electrically conducting to motor shaft 3, reduce the axle current and lead to motor shaft 3 and motor bearing to produce the risk of electric erosion damage, further improve the security of motor shaft 3 and motor bearing.

The first ground path L1 and the second ground path L2 may be connected in parallel or may be independent of each other.

Specifically, as shown in fig. 5, the second grounding assembly 2 includes a second conductive member 21 for electrically connecting with the motor shaft 3, and the second conductive member 21 is electrically connected with the first grounding assembly 1.

In the present embodiment, the second conductive member 21 and the first conductive member 13 form at least a part of the second ground path L2, and when the second ground assembly 2 conducts electricity to the motor shaft 3, the shaft current flows from the motor shaft 3 to the second conductive member 21 electrically connected thereto, further flows to the first conductive member 13 electrically connected to the second conductive member 21, and is grounded.

The structures of the second conductive member 21 and other components in this embodiment are as described in the above embodiments, and are not described herein again.

In addition, the present application also provides a motor shaft assembly, as shown in fig. 2, which includes a motor shaft 3 and a grounding device, wherein the grounding device is mounted to the motor shaft 3. The grounding device is the grounding device described in any of the above embodiments, and since the grounding device has the above technical effects, the motor shaft assembly including the grounding device should also have corresponding technical effects, which are not described herein again.

In a specific embodiment, as shown in fig. 2, the motor shaft 3 is a hollow shaft and the grounding device is mounted in the motor shaft 3.

In this embodiment, earthing device integral erection is in hollow motor shaft 3, and the inner wall with motor shaft 3 carries out the electricity and is connected, realizes carrying out axial electrically conductive and radial electrically conductive to the axle current in the motor shaft 3, realizes axle current multipath reliable ground connection, does not need extra occupation space, has saved the holistic space of motor shaft subassembly.

Wherein the grounding device can be mounted at the end of hollow motor shaft 3.

In a specific embodiment, the grounding device is mounted on the outside of the motor shaft 3 (not shown in the figures).

In this embodiment, the grounding device is installed on the outer side of the motor shaft 3, and is electrically connected to the outer wall of the motor shaft 3 to axially and radially conduct the shaft current of the motor shaft 3, thereby realizing multipath reliable grounding of the shaft current. At this moment, this earthing device is convenient for install, and the installation flexibility is higher.

It is noted that a portion of this patent application contains material which is subject to copyright protection. The copyright owner reserves the copyright rights whatsoever, except for making copies of the patent files or recorded patent document contents of the patent office.

Claims (17)

1. An earthing device, characterized in that it comprises at least two earthing assemblies for electrical connection with a motor shaft (3) to form at least two earthing paths;

wherein at least two of the ground paths are connected in parallel.

2. The grounding device according to claim 1, characterized in that the grounding assembly comprises at least a first grounding assembly (1) and a second grounding assembly (2), the first grounding assembly (1) comprises a conductive socket (11), a carbon brush (12) and a first conductive part (13), the conductive socket (11) is used for electrically connecting with a motor shaft (3), the carbon brush (12) is mounted on the conductive socket (11) and electrically connected with the conductive socket (11), and the first conductive part (13) and the carbon brush (12) can rotate relatively;

the second grounding assembly (2) comprises a second conductive part (21) for electrical connection with a motor shaft (3), and the second conductive part (21) is electrically connected with the first conductive part (13).

3. The grounding device according to claim 2, characterized in that the conductive socket (11), the carbon brush (12) and the first conductive part (13) are arranged in the axial direction of the motor shaft (3);

the second conductive member (21) and the first conductive member (13) are arranged in a radial direction of a motor shaft (3).

4. The grounding device according to claim 2, wherein the conductive base (11) is fixedly connected to the motor shaft (3) and fixedly connected to the carbon brush (12), so that the conductive base (11) can drive the carbon brush (12) to rotate.

5. The grounding device according to claim 2, characterized in that the first grounding assembly (1) further comprises a fastener (14), the fastener (14) being for fastening carbon fibers of the carbon brush (12).

6. The grounding device according to claim 5, wherein the conductive holder (11) comprises a base (112) and a sleeve (111) which are detachably connected, the base (112) has a mounting groove (112a), a part of the carbon brush (12) extends into the mounting groove (112a), and the fastening member (14) is located in the mounting groove (112 a);

the seat sleeve (111) is used for being electrically connected and fixedly connected with the motor shaft (3).

7. The grounding device according to any one of claims 2 to 6, wherein the first conductive member (13) includes a spring piece (131), one end of the spring piece (131) is in contact with the carbon brush (12) to enable the spring piece (131) and the carbon brush (12) to rotate relatively, and the other end is used for grounding;

the second conductive part (21) is in contact with the spring piece (131).

8. The grounding device according to claim 7, wherein the spring piece (131) includes a body portion (131a) and an extension portion (131b), the body portion (131a) is in contact with the carbon brush (12), and the extension portion (131b) extends radially outward with respect to the body portion (131 a);

the body portion (131a) is in contact with the second conductive member (21), and the extension portion (131b) and the conductive socket (11) are located at both ends of the second conductive member (21) in the axial direction of the motor shaft (3).

9. The grounding device as claimed in claim 7, wherein the first conductive member (13) further comprises a conductive sheet (132), one end of the conductive sheet (132) is fixedly connected and electrically connected with the elastic sheet (131), and the other end is used for grounding.

10. A device according to claim 7, characterized in that the second conducting part (21) is a conducting bearing or a conducting oil seal or a ground ring.

11. An earthing device, characterized in that it comprises a first earthing assembly (1), said first earthing assembly (1) being intended to be electrically connected with a motor shaft (3) to form a first earthing path (L1);

wherein the first grounding path (L1) grounds the motor shaft (3) in an axial direction of the motor shaft (3).

12. The grounding device according to claim 11, characterized in that the first grounding assembly (1) comprises a conductive socket (11), a carbon brush (12) and a first conductive part (13), the conductive socket (11) is used for electrically connecting with a motor shaft (3), the carbon brush (12) is mounted on the conductive socket (11) and electrically connected with the conductive socket (11), and the first conductive part (13) and the carbon brush (12) can rotate relatively;

the conductive holder (11), the carbon brush (12), and the first conductive member (13) are arranged in an axial direction of a motor shaft (3).

13. The grounding device of claim 11, characterized in that it further comprises a second grounding assembly (2), the second grounding assembly (2) being intended to be electrically connected to the motor shaft (3) to form a second grounding path (L2);

wherein the second grounding path (L2) grounds the motor shaft (3) in a radial direction of the motor shaft (3).

14. The earthing device according to claim 13, characterized in that the second earthing assembly (2) comprises a second conductive part (21) for electrical connection with the motor shaft (3), and that the second conductive part (21) is electrically connected with the first earthing assembly (1).

15. A motor shaft assembly, comprising:

a motor shaft (3);

an earthing device as claimed in any one of claims 1 to 14;

wherein the grounding device is mounted on the motor shaft (3).

16. The motor shaft assembly of claim 15, characterized in that the motor shaft (3) is a hollow shaft, and the grounding device is mounted in the motor shaft (3).

17. The motor shaft assembly of claim 15, wherein the grounding means is mounted on the outside of the motor shaft (3).

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