Electro-erosion protection ring structure and electric machine

Abstract

The utility model relates to a kind of electric erosion protection ring structure and motor, the motor protection ring structure includes annular body, conducting fiber bundle, clamping element;Annular body is equipped with multiple mounting holes on circumference, and mounting hole is along annular body radial penetration;Annular body end face is provided with clamping cavity, and clamping cavity is communicated with mounting hole;Conducting fiber bundle is set in mounting hole and extends to annular body radial interior, and the clamping element is set in clamping cavity, by exerting pressure to clamping element, make clamping element deform after clamping in clamping cavity and with conducting fiber bundle fixed in mounting hole.The utility model can effectively export motor shaft current to ground, avoid shaft current from motor bearing flow out to make bearing occur electric corrosion, and play a protective role to motor bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing electro-erosion protection, specifically to an electro-erosion protection ring structure. Background Technology

[0002] In recent years, the new energy sector has developed rapidly, and the application of variable frequency motors has become increasingly widespread. With the continuous increase in motor power, the higher voltage platform often leads to higher shaft voltage. Furthermore, to adapt to high speeds, the viscosity of lubricating oil / grease decreases, resulting in a thinner oil film and poorer load-bearing capacity. Therefore, bearing electro-corrosion problems have become prominent in the past two years. Bearing electro-corrosion in motors is a key concern for OEMs recently.

[0003] To protect bearings and prevent bearing electrolytic corrosion, it is necessary to discharge the shaft current, leakage current, and fault-induced current generated during the operation of the drive motor. In existing technologies, shaft current discharge devices mostly use fiber bundles to fix conductive fibers and then install them on conductive rings, which is relatively complex in structure and manufacturing process. Utility Model Content

[0004] The purpose of this invention is to provide an electro-erosion protection ring structure and a motor to solve the problem of electro-erosion of motor bearings.

[0005] According to one aspect of the present invention, an electro-erosion protection ring structure is provided, comprising a ring-shaped body, a conductive fiber bundle, and a snap-fit ​​element;

[0006] The annular body has multiple mounting holes in its circumferential direction, and the mounting holes penetrate radially along the annular body; the annular body has a snap-fit ​​cavity on its end face, and the snap-fit ​​cavity communicates with the mounting holes.

[0007] The conductive fiber bundle is disposed in the mounting hole and extends radially into the annular body. The snap-fit ​​element is disposed in the snap-fit ​​cavity. By applying pressure to the snap-fit ​​element, the snap-fit ​​element is deformed and snapped into the snap-fit ​​cavity, thus fixing the conductive fiber bundle in the mounting hole.

[0008] Preferably, the hardness of the snap-fit ​​element is less than the hardness of the annular body.

[0009] Preferably, after the snap-fit ​​element is snapped into the snap-fit ​​cavity, its bottom abuts against the conductive fiber bundle and is located at a position greater than or equal to one-third of the radial direction of the mounting hole.

[0010] Preferably, the snap-fit ​​element is a ball, the snap-fit ​​cavity is a ball hole, and the ball hole is provided on the end face of the annular body corresponding to the mounting hole and communicating with the mounting hole;

[0011] The diameter of the bead before deformation is less than or equal to the diameter of the bead hole.

[0012] Preferably, the bead hole has a chamfer on the end face of the annular body, so that when the bead deforms and is engaged in the bead hole, the top of the bead is flush with the bottom of the chamfer surface.

[0013] Preferably, the snap-fit ​​element is a ring, and the snap-fit ​​cavity is an annular groove, which is provided on the end face of the annular body corresponding to the mounting hole and communicating with the mounting hole;

[0014] The width of the ring before deformation is less than or equal to the width of the annular groove.

[0015] Preferably, the annular groove has a chamfer on the end face of the annular body, so that when the annular ring is deformed and engaged in the annular groove, the top of the annular ring is flush with the bottom of the chamfer.

[0016] Preferably, the annular groove is coaxially arranged with the annular body.

[0017] Preferably, two sets of conductive fiber bundles are arranged along the axial direction of the annular body, and snap-fit ​​cavities are provided on both end faces of the annular body.

[0018] According to another aspect of the present invention, an electric motor is provided, the electric motor including the aforementioned electro-erosion protection ring structure, the electro-erosion protection ring structure being sleeved on the motor shaft, and the conductive fiber bundle abutting radially against the motor shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model can effectively conduct the motor shaft current to ground, prevent the shaft current from flowing out of the motor bearing and causing electrical corrosion of the bearing, and play a protective role for the motor bearing.

[0021] 2. This utility model directly snaps the conductive fiber bundles into the device body through snap-fit ​​elements, without the need for additional fixing devices. The structure is simple, and multiple conductive fiber bundles on the ring-shaped body of the mounting body can be fixed at the same time by applying pressure once, without the need to apply pressure to fix them one by one, making it convenient to manufacture.

[0022] 3. This utility model increases the contact area between the snap-fit ​​element and the conductive fiber bundle by applying pressure to the snap-fit ​​element, and at the same time, the snap-fit ​​element is pressed into the installation hole of the conductive fiber bundle to a certain depth, so that the conductive fiber bundle is more firmly fixed, and the pull-out force and conductivity are enhanced.

[0023] 4. The snap-fit ​​element of this utility model undergoes plastic deformation under force and snaps into the snap-fit ​​cavity of the annular body, thereby achieving the fastening and installation of the conductive fiber bundle; at the same time, the hardness of the snap-fit ​​element is less than that of the annular body, so the deformation of the snap-fit ​​element will not cause the annular body to deform, thus affecting the use and assembly of the annular body. Attached Figure Description

[0024] Figure 1 This is an exploded structural diagram of one embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of one embodiment of the present utility model;

[0026] Figure 3 This is a partial structural cross-sectional view of one embodiment of the present invention;

[0027] Figure 4 This is an exploded structural diagram of another embodiment of the present invention;

[0028] Figure 5 This is a three-dimensional structural schematic diagram of another embodiment of the present invention;

[0029] Figure 6 This is a partial structural cross-sectional schematic diagram of another embodiment of the present invention.

[0030] In the figure: 1-ring-shaped body; 2-conductive fiber bundle; 3-clamping element; 31-bead; 32-ring; 4-clamping cavity; 41-bead hole; 42-annular groove; 5-mounting hole; 6-cranked corner; 61-bottom end of cranked corner surface. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0032] Example 1:

[0033] An electro-erosion protection ring structure, such as Figure 1-6As shown, it includes an annular body 1, a conductive fiber bundle 2, and a snap-fit ​​element 3; the annular body 1 has multiple mounting holes 5 in its circumferential direction, and the mounting holes 5 penetrate radially along the annular body 1; a snap-fit ​​cavity 4 is provided on the end face of the annular body 1, and the snap-fit ​​cavity 4 communicates with the mounting holes 5; the conductive fiber bundle 2 is disposed in the mounting holes 5 and extends radially into the annular body 1, and the snap-fit ​​element 3 is disposed in the snap-fit ​​cavity 4. By applying pressure to the snap-fit ​​element 3, the snap-fit ​​element 3 is deformed and snapped into the snap-fit ​​cavity 4, thus fixing the conductive fiber bundle 2 in the mounting holes 5. The manufacturing process and principle are as follows: Several radial through holes are equally spaced on the circumference of the annular body 1 as mounting holes 5. A snap-fit ​​cavity 4 is opened on the end face of the annular body 1 at the position corresponding to the mounting hole 5. The snap-fit ​​cavity 4 is connected to the mounting hole 5. Several conductive fiber bundles 2 are respectively installed in the mounting hole 5. The snap-fit ​​element 3 is placed in the snap-fit ​​cavity 4, and then pressure is applied to the snap-fit ​​element 3, so that the snap-fit ​​element 3 moves towards the conductive fiber bundle 2 and squeezes the conductive fiber bundle 2. At the same time, the snap-fit ​​element 3 is deformed under the pressure, especially expanding perpendicular to the direction of force. After the size increases, it is snapped in the snap-fit ​​cavity 4. At this time, the bottom of the snap-fit ​​element 3 abuts against the conductive fiber bundle 2 and is located inside the mounting hole 5. When subjected to force, the snap-fit ​​element 3 abuts against the conductive fiber bundle 2 on one hand, and deforms and snaps into the snap-fit ​​cavity 4 on the other, thereby achieving a tight installation of the conductive fiber bundle 2, increasing the tensile strength of the conductive fiber bundle 2, and simultaneously squeezing out the air between the conductive fiber bundle 2, the annular body 1, and the snap-fit ​​element 3, increasing the contact area, reducing the contact resistance, and increasing the conductivity. After the snap-fit ​​element 3 is snapped into the snap-fit ​​cavity 4, the surface of the snap-fit ​​element 3 will not exceed the surface of the annular body 1.

[0034] The annular body 1 can be made of various conductive materials such as aluminum alloy, copper alloy or silver alloy; the conductive fiber bundle 2 can be made of materials such as metal conductive fiber, carbon black conductive fiber, metal compound conductive fiber or conductive polymer fiber; the snap-fit ​​element 3 can be made of various malleable metal or non-metal materials.

[0035] In preferred embodiment 1, the hardness of the snap-fit ​​element 3 is less than that of the annular body 1, ensuring that deformation of the snap-fit ​​element 3 under stress will not cause deformation of the annular body 1, thus affecting the use and assembly of the annular body 1. As an assembly functional component, such as when the annular body 1 is assembled onto a motor, its outer diameter and thickness are crucial. Deformation of these critical dimensions will affect actual assembly and use.

[0036] In preferred embodiment 2, to make the contact element 3 more firmly abut against the conductive fiber bundle 2, and to enhance the pull-out force and conductivity, such as... Figure 3As shown in Figure 6, after the snap-fit ​​element 3 snaps into the snap-fit ​​cavity 4, its bottom abuts against the conductive fiber bundle 2 and is located at a position greater than or equal to one-third of the radial direction of the mounting hole 5. A chamfer 6 is provided on the snap-fit ​​cavity 4, and the bottom end 61 of the chamfer surface indicates the termination position of the applied pressure. At this time, the snap-fit ​​element 3 moves to a position greater than or equal to one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. After the snap-fit ​​element 3 expands under force, it snaps into the snap-fit ​​cavity 4. The purpose of the snap-fit ​​element 3 moving to a certain depth in the mounting hole 5 is to better secure the conductive fiber bundle 2, and at the same time, to eliminate the air gap between the snap-fit ​​element 3 and the conductive fiber bundle 2, enhance the contact, and reduce the contact resistance. Preferably, it moves to a position greater than or equal to one-third of the radial direction of the mounting hole 5. In fact, as long as the top of the snap-fit ​​element 3 moves to a position within the snap-fit ​​cavity 4, the effect of securing the conductive fiber bundle 2 can be achieved.

[0037] In preferred embodiment 3, two sets of conductive fiber bundles 2 are arranged along the axial direction of the annular body 1, corresponding to two sets of mounting holes 5 on the axial direction of the annular body 1. Snap-fit ​​cavities 4 are provided on both end faces of the annular body 1. The snap-fit ​​cavities 4 on the two end faces are respectively arranged and connected to the two sets of mounting holes 5. The two sets of conductive fiber bundles 2 on the axial direction of the annular body 1 are fixed by snap-fit ​​elements 3 in the snap-fit ​​cavities 4 on the two end faces of the annular body 1. The fixing method refers to the aforementioned preparation process and principle.

[0038] Example 2:

[0039] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 1-3 As shown, the snap-fit ​​element 3 is a ball 31, and the snap-fit ​​cavity 4 is a ball hole 41. The ball hole 41 is provided on the end face of the annular body 1 corresponding to the mounting hole 5 and communicating with the mounting hole 5.

[0040] The manufacturing process and principle of this embodiment are as follows: Several radial through holes are equally spaced on the circumference of the annular body 1 as mounting holes 5. A bead hole 41 is opened on the end face of the annular body 1 at a position corresponding to the mounting hole 5. The bead hole 41 corresponds one-to-one with the mounting hole 5 and is connected to the mounting hole 5. Several conductive fiber bundles 2 are respectively installed in the mounting holes 5. A bead 31 is placed in the bead hole 41. Then, all the beads 31 are simultaneously subjected to pressure, causing the beads 31 to move towards the conductive fiber bundle 2 and squeeze the conductive fiber bundle 2. At the same time, the beads 31 are deformed under the pressure, especially expanding perpendicular to the direction of the applied force. After the size increases, they are stuck in the bead hole 41. At this time, the bottom of the bead 31 abuts against the conductive fiber bundle 2 and is located inside the mounting hole 5.

[0041] The advantage of using a ball 31 as the snap-fit ​​element 3 is that when placing the ball 31 into the ball hole 41 on the end face of the annular body 1, it is not necessary to place the ball 31 into multiple ball holes 41 one by one. Multiple balls 31 can be released onto the end face of the annular body 1 at once, and then the ball 31 will automatically roll into the ball hole 41 through vibration. The assembly and preparation are simple and quick.

[0042] In order to facilitate the placement of the bead 31 into the bead hole 41, in a preferred embodiment, the diameter of the bead 31 before deformation is less than or equal to the diameter of the bead hole 41. In order to ensure that the bead 31 can be tightly fitted into the bead hole 41 after deformation, the diameter of the bead 31 before deformation is slightly smaller than the diameter of the bead hole 41. For example, the diameter of the bead 31 before deformation is 0-3mm smaller than the diameter of the bead hole 41.

[0043] To facilitate knowing the endpoint of the applied pressure and for processing purposes, in the preferred embodiment, such as... Figure 3 As shown, the bead hole 41 is provided with a chamfer 6 on the end face of the annular body 1. When the bead 31 deforms and is engaged in the bead hole 41, the top of the bead 31 is flush with the bottom end 61 of the chamfer surface. That is to say, when pressure is applied to move the top of the bead 31 to the bottom end of the chamfer surface 6, the bottom of the bead 31 is located at more than one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. The bead 31 deforms and expands under pressure, which can be tightly engaged in the bead hole 41, thereby realizing the tight mounting of the conductive fiber bundle 2 on the annular body 1.

[0044] Example 3:

[0045] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 4-6 As shown, the snap-fit ​​element 3 is a ring 32, and the snap-fit ​​cavity 4 is an annular groove 42. The annular groove 42 is provided on the end face of the annular body 1 corresponding to the mounting hole 5 and communicating with the mounting hole 5; the annular groove 42 is coaxially arranged with the annular body 1.

[0046] The manufacturing process and principle of this embodiment are as follows: Several radial through holes are equally spaced in the circumference of the annular body 1 as mounting holes 5. An annular groove 42 is coaxially formed on the end face of the annular body 1 at the position corresponding to the mounting holes 5, and the annular groove 42 is connected to the mounting holes 5. Several conductive fiber bundles 2 are respectively installed in the mounting holes 5. The ring 32 is placed in the annular groove 42, and then pressure is applied to the ring 32 to make the ring 32 move towards the conductive fiber bundles 2 and squeeze the conductive fiber bundles 2. At the same time, the ring 32 is deformed by the pressure, especially expanding perpendicular to the direction of the applied force. After the size increases, it is stuck in the annular groove 42. At this time, the bottom of the ring 32 abuts against the conductive fiber bundles 2 and is located in the mounting holes 5.

[0047] The advantage of using a ring 32 for the snap-fit ​​element 3 is that multiple conductive fiber bundles 2 can be crimped and fixed at one time through the ring 32, making the processing convenient and efficient.

[0048] To facilitate placement of the ring 32 within the annular groove 42, in a preferred embodiment, the width of the ring 32 before deformation is less than or equal to the width of the annular groove 42. To facilitate knowing the endpoint of the applied pressure and for ease of processing, in a preferred embodiment, such as... Figure 6 As shown, the annular groove 42 has a chamfer 6 on the end face of the annular body 1. When the ring 32 deforms and is engaged in the annular groove 42, the top of the ring 32 is flush with the bottom end 61 of the chamfer surface. That is to say, when pressure is applied to move the top of the ring 32 to the bottom end of the chamfer surface 6, the bottom of the ring 32 is located at more than one-third of the radial direction of the mounting hole 5 and abuts against the conductive fiber bundle 2. The ring 32 deforms and expands under pressure, which can be tightly engaged in the annular groove 42, thereby realizing the tight installation of the conductive fiber bundle 2 on the annular body 1.

[0049] Example 4:

[0050] An electric motor includes the aforementioned electro-erosion protection ring structure, which is sleeved on the motor shaft. The conductive fiber bundle 2 radially abuts against the motor shaft to conduct the motor shaft current and prevent electro-erosion of the motor bearing.

[0051] In this utility model, the use of directional terms such as "upper," "lower," "left," "right," "bottom," and "top" is defined relative to the directions shown in the accompanying drawings and is used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These or other directional terms should not be construed as restrictive terms.

[0052] Furthermore, this utility model does not discuss in detail the technologies and equipment known to those skilled in the art, but where appropriate, such technologies and equipment should be considered part of the specification.

[0053] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A protective ring structure for electro-erosion, characterized in that, Includes a ring-shaped body, conductive fiber bundles, and snap-fit ​​elements; The annular body has multiple mounting holes in its circumferential direction, and the mounting holes penetrate radially along the annular body; the annular body has a snap-fit ​​cavity on its end face, and the snap-fit ​​cavity communicates with the mounting holes. The conductive fiber bundle is disposed in the mounting hole and extends radially into the annular body. The snap-fit ​​element is disposed in the snap-fit ​​cavity. By applying pressure to the snap-fit ​​element, the snap-fit ​​element is deformed and snapped into the snap-fit ​​cavity, thus fixing the conductive fiber bundle in the mounting hole.

2. The electro-erosion protection ring structure according to claim 1, characterized in that, The hardness of the snap-fit ​​element is less than that of the annular body.

3. The electro-erosion protection ring structure according to claim 1, characterized in that, After the snap-fit ​​element snaps into the snap-fit ​​cavity, its bottom abuts against the conductive fiber bundle and is located at a position greater than or equal to one-third of the radial direction of the mounting hole.

4. The electro-erosion protection ring structure according to claim 1, characterized in that, The snap-fit ​​element is a ball, and the snap-fit ​​cavity is a ball hole. The ball hole is provided on the end face of the annular body in correspondence with the mounting hole and communicates with the mounting hole. The diameter of the bead before deformation is less than or equal to the diameter of the bead hole.

5. The electro-erosion protection ring structure according to claim 4, characterized in that, The bead hole has a chamfer on the end face of the annular body. When the bead deforms and is engaged in the bead hole, the top of the bead is flush with the bottom of the chamfer.

6. The electro-erosion protection ring structure according to claim 1, characterized in that, The snap-fit ​​element is a ring, and the snap-fit ​​cavity is an annular groove. The annular groove is provided on the end face of the ring-shaped body, corresponding to the mounting hole and communicating with the mounting hole. The width of the ring before deformation is less than or equal to the width of the annular groove.

7. The electro-erosion protection ring structure according to claim 6, characterized in that, The annular groove has a chamfer on the end face of the annular body. When the annular ring is deformed and engaged in the annular groove, the top of the annular ring is flush with the bottom of the chamfer.

8. The electro-erosion protection ring structure according to claim 6, characterized in that, The annular groove is coaxially arranged with the annular body.

9. The electro-erosion protection ring structure according to claim 1, characterized in that, Two sets of conductive fiber bundles are arranged along the axial direction of the annular body, and snap-fit ​​cavities are provided on both end faces of the annular body.

10. An electric motor, characterized in that, The motor includes the electro-erosion protection ring structure as described in any one of claims 1-9, wherein the electro-erosion protection ring structure is sleeved on the motor shaft, and the conductive fiber bundle abuts radially against the motor shaft.

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