Conducting ring

Abstract

The utility model discloses a conducting ring, which comprises a conducting ring body and conducting fiber bundles, a front extrusion groove and a back extrusion groove are respectively arranged on two sides of the conducting ring body, the conducting ring body is provided with a plurality of radial holes used for installing the conducting fiber bundles, and one end of each radial hole close to the inner side of the conducting ring body is provided with a fillet structure. A plurality of conductive fiber bundles are respectively installed in a plurality of radial holes, and a press machine respectively extrudes a front extrusion groove and a back extrusion groove, so that two hole walls of the radial holes are deformed, the conductive fiber bundles are respectively pressed from two surfaces, the installation of the conductive fiber bundles is firmer and more reliable, the contact between the conductive fiber bundles and the conductive ring body is increased, and the service life of the conductive ring body is prolonged. And the fillet structure can prevent the conductive ring body from cutting the conductive fiber. The conducting ring is simple in overall structure, simple in process, high in production efficiency, low in cost of required production equipment and suitable for mass production.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrically conductive ring, especially to an electrically conductive ring. BACKGROUND

[0002] Bearings have been widely used in the fields of automobile industry, mechanical manufacturing, aerospace, marine engineering, military, etc. due to their excellent characteristics of reducing friction, supporting and positioning, bearing load, reducing energy consumption, prolonging equipment life, etc. However, in the motor industry, especially in the application of high-voltage motors above 400V, there are several situations that can cause bearing electric corrosion:

[0003] 1. Electric leakage: In mechanical equipment, especially in motor-driven equipment, if the grounding of the motor is poor or the insulation system is aging, it may cause leakage current to pass through the bearing. When the leakage current passes through the bearing, it will form an electric arc, causing partial discharge and electric corrosion.

[0004] 2. Static electricity accumulation: In high-speed or plastic component-equipped equipment, static electricity is prone to accumulate. If static electricity is not released in time, electric current may pass through the bearing, causing discharge and electric corrosion.

[0005] 3. Improper current loop: In some industrial equipment or generators, bearings sometimes accidentally become part of the current loop, and current flows from the shaft to the ground through the bearing. In this case, the bearing will gradually show signs of electric corrosion after long-term operation.

[0006] 4. Variable frequency drive motor (VFD): Motors using variable frequency drives are particularly prone to bearing electric corrosion. Variable frequency drives generate high-frequency voltage, which forms a current through the motor shaft and bearing, causing electric corrosion problems to be particularly common in variable frequency motors.

[0007] Electric corrosion can cause many hazards, such as bearing surface damage, lubricant degradation, increased noise and vibration, shortened bearing life, and other phenomena. This seriously hinders its application. Especially for high-voltage motors with a voltage exceeding 800V, higher platform voltage raises shaft voltage, higher switching frequency means more breakdown times, higher motor power causes a surge in induced energy, and more demanding operating conditions make the bearing oil film more prone to breakdown, and special attention must be paid to the electric corrosion risk of the side bearing of the reduction gearbox. The motor electrically conductive ring is a device that uses an electrically conductive medium to guide the motor shaft current to the motor housing, avoiding the production of bearing electric corrosion caused by shaft current passing through the bearing. In theory, under the condition that the resistance of the electrically conductive ring is small enough, the bearing can effectively avoid the defect of electric corrosion.

[0008] Currently, the structure of the electrically conductive ring mainly includes carbon brush type, multi-layer superposition type, porous press-fitting type, etc.

[0009] The structural principle of the carbon brush type is that a carbon rod is installed radially on the conductive ring, a spring is installed in the radial direction of the carbon rod, and the spring pushes the carbon rod to the center of the conductive ring. Under the pushing force of the spring, the carbon rod is always pressed on the rotating motor shaft to transmit the motor shaft current from the high-speed rotating shaft to the shell. Further, the voltage of the shaft and the shell of the motor is 0 or the voltage difference is 0, thereby avoiding bearing electric corrosion.

[0010] The structural principle of the multi-layer superposition type is that the upper layer, the middle layer and the lower layer of the conductive ring are respectively manufactured by injection molding or machining process. The conductive body (for example, conductive fiber) is installed on the middle layer, and the three layers are fixed together by bolts or molding glue and the like process to form the conductive body (for example, conductive fiber) which can contact the high-speed rotating motor shaft and the conductive ring body which can be installed on the conductive ring of the motor shell. The function of guiding the motor shaft current to the shell is realized, and the bearing electric corrosion is eliminated.

[0011] The structural principle of the multi-hole press-fit type is that a single conductive ring body is machined by machining, a through installation hole of the conductive body (for example, conductive fiber) is machined in the radial direction, and a press-fit forming hole of the conductive body (for example, conductive fiber) is machined in the axial direction of the end face of the conductive ring, which corresponds to the through installation hole of the conductive body (for example, conductive fiber) in one-to-one correspondence. The conductive body (for example, conductive fiber) is fixed in each press-fit forming hole by using a press machine, thereby forming the structure of the conductive ring. The function of guiding the motor shaft current to the shell or the ground is realized, and the motor bearing electric corrosion is eliminated.

[0012] At present, the conductive ring manufactured by the carbon brush type has large structure size, the carbon brush has physical wear, a large amount of carbon powder is easily formed, the wear is fast, and the service life of the conductive ring is short. The multi-layer superposition type conductive ring has too many parts, which leads to low production efficiency and high production cost, and there is a risk of safety hidden danger caused by falling of fasteners. The multi-hole press-fit type conductive ring has more machining surfaces, needs to use a machine tool with three or more axes, and has high production equipment cost; the number of press-fit forming holes is large, and needs to be machined one by one, so the production efficiency is also low.

[0013] It can be seen that the prior art still needs to be improved and improved. Practical new type content

[0014] In view of the defects of the prior art, the purpose of the present application is to provide a conductive ring, which aims to solve the technical problems of fast wear, short service life, complex machining, high production cost and low efficiency caused by the structure of the conductive ring in the prior art.

[0015] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0016] The utility model provides a conductive ring, wherein, including conductive ring body and a plurality of conductive fiber bundles, the conductive ring body annularly is provided with a plurality of radial holes for installing the conductive fiber bundle, the radial hole is close to the one end of the inside of conductive ring body and is provided with the rounded corner structure, the one side of conductive ring body is recessed and is provided with the front extrusion slot, the other side of conductive ring body is recessed and is provided with the back extrusion slot, and the front extrusion slot is used for the outside pressure machine extrusion deformation to make the inner wall of radial hole compress the conductive fiber bundle with the back extrusion slot.

[0017] Specifically, a plurality of radial holes are annularly arranged around the axis of the conductive ring body, and the axes of the plurality of radial holes are located on the same plane.

[0018] Specifically, the front extrusion slot and the back extrusion slot are both annular slots coaxial with the conductive ring body, and the outer diameter of the front extrusion slot is smaller than the inner diameter of the back extrusion slot.

[0019] Specifically, the conductive ring body is provided with at least two axial holes penetrating through two sides of the conductive ring body in the axial direction, and the at least two axial holes are staggered with the plurality of radial holes, respectively.

[0020] Specifically, the radial hole is provided with an inverted right angle structure close to one end of the outside of the conductive ring body.

[0021] Beneficial effects:

[0022] The utility model provides a conductive ring, including conductive ring body and conductive fiber bundle, the both sides of conductive ring body are provided with front extrusion slot and back extrusion slot respectively, and the conductive ring body is provided with a plurality of radial holes for installing the conductive fiber bundle, and the radial hole is close to the one end of the inside of conductive ring body and is provided with rounded corner structure. The conductive ring, by installing a plurality of conductive fiber bundles in a plurality of radial holes respectively, extruding front extrusion slot and back extrusion slot by press respectively, making the intersection of front extrusion slot and radial hole, the intersection of back extrusion slot and radial hole deform, respectively, from two sides of the conductive fiber bundle, make the installation of conductive fiber bundle more firm and reliable, and increase the contact of conductive fiber bundle and conductive ring body, reduce the conduction resistance between both, and the rounded corner structure can prevent the cutting of conductive ring body to the conductive fiber. The overall structure of the conductive ring is simple, the process is simple, the production efficiency is high, the required production equipment cost is low, and it is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model provides the three -dimensional structure schematic diagram of conductive ring for the utility model provides the three -dimensional structure schematic diagram of conductive ring;

[0024] Figure 2 The utility model provides the cut structure schematic diagram of conductive ring for the utility model provides the cut structure schematic diagram of conductive ring;

[0025] Figure 3 The utility model provides the Figure 2A local structure diagram of the conductive ring.

[0026] Reference signs:

[0027] 1 - conductive ring body 2 - conductive fiber bundle 11 - radial hole

[0028] 12 - front extrusion groove 13 - back extrusion groove 14 - axial hole

[0029] 15 - inverted right angle structure 16 - inverted round angle structure. DETAILED DESCRIPTION

[0030] The utility model provides a kind of conductive ring, to make the purpose, technical scheme and effect of the utility model more clear, definite, the following with reference to drawing and example of raising further detailed description of the utility model.It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0031] In the description of the utility model, it needs to be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawing, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or implied that the indicated device or element must have a particular orientation, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the utility model.In addition, "first", "second" is only for the purpose of description, and cannot be understood as indicative or implied relative importance or implicitly indicate the number of the indicated technical features.Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0032] Please refer to Figures 1 to 3 The utility model provides a kind of conductive ring, wherein, including conductive ring body 1 and several conductive fiber bundles 2, the radial hole 11 for installing conductive fiber bundle 2 is annularly provided with several conductive ring body 1, one side of conductive ring body 1 is recessed with front extrusion groove 12, the other side of conductive ring body 1 is recessed with back extrusion groove 13, front extrusion groove 12 and back extrusion groove 13 are used for extrusion deformation by external pressure machine to make the inner wall of radial hole 11 compact conductive fiber bundle 2.In the embodiment, the diameters of front extrusion groove 12 and back extrusion groove 13 are different, so that they are staggered from the cross section, and conductive fiber bundle 2 is formed by 12000 single conductive fibers with a diameter less than 1 micrometer, and the end of conductive fiber bundle 2 close to the axis of conductive ring body 1 protrudes out of radial hole 11, forming conductive brush.

[0033] Please refer to Figures 2 to 3As shown, the radial hole 11 is provided with a rounded corner structure 16 near one end of the inner side of the conductive ring body 1, which can effectively avoid the radial tension of the motor shaft during high-speed rotation to the conductive fiber bundle 2, so that the conductive ring body 1 can cut the conductive fiber bundle 2.

[0034] In the production, the conductive ring body 1, the conductive fiber bundle 2 and other single parts are simply machined, and then the conductive fiber bundle 2 is installed in the radial hole 11. The front extrusion groove 12 and the back extrusion groove 13 of the conductive ring body 1 are extruded by the pressure machine, so that the hole wall position corresponding to the radial hole 11 is deformed, thereby pressing the conductive fiber bundle 2, so that the conductive fiber bundle 2 is installed reliably and can resist larger radial tension, and the contact area between the conductive fiber bundle 2 and the conductive ring body 1 is increased, so that the conduction resistance between them is smaller. The design of the front extrusion groove 12 and the back extrusion groove 13 forms a concave surface on the inner and outer sides of the two sides of the conductive ring body 1, which effectively locally releases the stress generated in the extrusion forming process of the fixed conductive fiber bundle 2, and avoids changing the inner and outer diameter sizes and tolerances of the conductive ring body 1.

[0035] As shown in Figures 1 to 2 As shown, a plurality of radial holes 11 are arranged in a ring around the axis of the conductive ring body 1, and the axes of the plurality of radial holes 11 are located in the same plane. In this embodiment, the axes of the plurality of radial holes 11 are arranged in the same plane, which is beneficial to the two sides of the conductive ring body 1 to be provided with grooves, so that the distance between the front extrusion groove 12 and the back extrusion groove 13 and the radial hole 11 can remain consistent, facilitating processing and production and extrusion installation of the conductive fiber bundle 2.

[0036] As shown in Figures 1 to 2 As shown, the front extrusion groove 12 and the back extrusion groove 13 are both annular grooves coaxial with the conductive ring body 1, the outer diameter of the front extrusion groove 12 is smaller than the inner diameter of the back extrusion groove 13, and from the cross section, the front extrusion groove 12 and the back extrusion groove 13 are arranged staggered, respectively forming a concave surface on the inner and outer sides of the two sides of the conductive ring body 1, which effectively locally releases the stress generated in the extrusion forming process of the fixed conductive fiber bundle 2, and avoids changing the inner and outer diameter sizes and tolerances of the conductive ring body 1.

[0037] As shown in Figure 1 As shown, the conductive ring body 1 is provided with at least two axial holes 14, and the at least two axial holes 14 penetrate the two sides of the conductive ring body 1 in the axial direction. The at least two axial holes 14 are arranged staggered with the plurality of radial holes 11. During installation of the conductive ring, the conductive ring body 1 can be fixed on the shell of the motor by screwing the screw into the axial hole 14. The axial hole 14 and the radial hole 11 are arranged staggered, avoiding the interference between the conductive fiber bundle 2 in the radial hole 11 and the installation screw, affecting the installation and use.

[0038] As shown inFigures 2 to 3 As shown in the drawings, the radial hole 11 is provided with an inverted right angle structure 15 near one end of the outer side of the conductive ring body 1, which facilitates the conductive fiber bundle 2 to enter the radial hole 11.

[0039] In summary, the utility model discloses a plurality of conductive fiber bundles 2 are installed in a plurality of radial holes 11 respectively, and the front extrusion groove 12 and the back extrusion groove 13 are extruded by the press respectively, so that the intersection of the front extrusion groove 12 and the radial hole 11 and the intersection of the back extrusion groove 13 and the radial hole 11 are deformed, the conductive fiber bundle 2 is pressed from two sides respectively, the installation of the conductive fiber bundle 2 is more firm and reliable, and the contact between the conductive fiber bundle 2 and the conductive ring body 1 is increased, and the conduction resistance between the two is reduced. The overall structure of the conductive ring is simple, the process is simple, the production efficiency is high, the required production equipment cost is low, and it is suitable for mass production.

[0040] It can be understood that for ordinary skilled persons in the art, equivalent replacement or change can be made according to the technical scheme and the utility model concept of the utility model, and all these changes or replacements shall belong to the protection scope of the claims attached to the utility model.

Claims

1. An electrically conductive ring, characterized in that, The conductive ring body (1) is annularly provided with a plurality of radial holes (11) for mounting the conductive fiber bundles (2), and the radial holes (11) are provided with rounded corner structures (16) near one end of the inner side of the conductive ring body (1); one side of the conductive ring body (1) is concavely provided with a front extrusion groove (12), and the other side of the conductive ring body (1) is concavely provided with a back extrusion groove (13); the front extrusion groove (12) and the back extrusion groove (13) are used for extrusion deformation by an external press to press the inner wall of the radial hole (11) against the conductive fiber bundle (2).

2. The electrically conductive ring of claim 1, wherein, The plurality of radial holes (11) are annularly arranged around the axis of the conductive ring body (1), and the axes of the plurality of radial holes (11) are located on the same plane.

3. The conductive ring of claim 1, wherein, The front extrusion groove (12) and the back extrusion groove (13) are both annular grooves coaxial with the conductive ring body (1), and the outer diameter of the front extrusion groove (12) is smaller than the inner diameter of the back extrusion groove (13).

4. The electrically conductive ring of claim 2, wherein The conductive ring body (1) is provided with at least two axial holes (14) penetrating through the two sides of the conductive ring body (1) in the axial direction, and the at least two axial holes (14) are respectively staggered with the plurality of radial holes (11).

5. The conductive ring of claim 2, wherein, The radial hole (11) is provided with a straight-angle structure (15) near one end of the outer side of the conductive ring body (1).

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