Telescopic multi-contact motor grounding ring

Abstract

The utility model relates to the technical field of motors, and discloses a telescopic multi-contact motor grounding ring, which comprises a grounding ring body mounted on a motor casing and a motor shaft, the grounding ring body comprises a mounting ring and a conducting ring, the conducting ring is positioned on the inner side of the mounting ring and is fixedly connected with the mounting ring, the mounting ring is connected with the motor casing, and the motor casing is connected with the motor shaft. A plurality of telescopic holes are formed in the inner side of the conducting ring, telescopic contact pieces are connected into the telescopic holes, and the telescopic contact pieces are connected with a motor shaft. According to the telescopic multi-contact motor grounding ring, the conductive ring and the motor shaft are in movable contact through the telescopic contact piece installed on the inner side of the conductive ring, so that too strong friction force on the motor shaft is avoided, rotation of the motor shaft is prevented from being hindered, and the contact effect of the conductive ring and the motor shaft is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a telescopic multi-contact motor grounding ring. Background Technology

[0002] When an electric motor is running, a shaft voltage is often generated between its shaft and housing. When this shaft voltage exceeds a certain threshold, it can rupture the oil film inside the motor bearing, instantly triggering a large shaft current. This shaft current can cause electro-corrosion of the motor bearing, leading to premature failure due to abnormal temperature increases. Electro-corrosion of the bearing exacerbates damage during motor operation, ranging from increased motor noise to direct bearing failure and power interruption. To mitigate this problem, a common measure is to install a grounding ring on the motor bearing. The grounding ring's function is to conduct the shaft current generated between the motor shaft and housing, thereby protecting the motor bearing from damage.

[0003] Patent CN218850573U discloses a shaft grounding ring and a motor, including a skeleton ring, a conductive element, and multiple clamping elements. The skeleton ring is fixed inside the motor housing, and a mounting hole for the motor shaft to pass through is opened at the center of the skeleton ring. The skeleton ring is conductive and has a receiving groove formed inside. The conductive element is located in the receiving groove and can contact the motor shaft. Multiple clamping elements are spaced apart along the circumference of the skeleton ring at the edge of the mounting hole. The multiple clamping elements can be bent to tightly press the conductive element onto the skeleton ring. The multiple clamping elements are integrally formed on the skeleton ring, simplifying the structure of the shaft grounding ring, making it easier to process, saving manufacturing costs, and reducing the weight of the shaft grounding ring, which meets the requirements of lightweight design. The shaft current generated by the motor shaft flows through the conductive element and the skeleton ring to the motor housing, and then grounds through the motor housing, avoiding bearing erosion that would affect the motor's performance and extending the motor's service life.

[0004] However, the motor grounding ring in the above technology still has the following problems: During actual installation, the conductive parts on the motor grounding ring may not make good contact with the motor shaft, and sometimes the conductive parts may even be squeezed onto the motor shaft due to improper installation. In this case, when the motor rotates at high speed, strong friction will be generated between the motor shaft and the conductive parts, thus generating frictional heat. This frictional heat will cause the motor shaft temperature to become too high, which will not only affect the normal operation of the motor, but may also damage the motor shaft, thereby shortening the service life of the motor. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a telescopic multi-contact motor grounding ring, which improves the contact effect between conductive components and the motor shaft.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a telescopic multi-contact motor grounding ring, comprising a grounding ring body mounted on a motor housing and a motor shaft, the grounding ring body comprising a mounting ring and a conductive ring, the conductive ring being located inside the mounting ring and fixedly connected to the mounting ring, the mounting ring being connected to the motor housing, and the conductive ring having a plurality of telescopic holes on its inner side, each of the plurality of telescopic holes being connected to a telescopic contact element, and each of the plurality of telescopic contact elements being connected to the motor shaft.

[0007] Furthermore, the number of telescopic contacts is no less than three, and the telescopic contacts are equidistantly distributed along the inner circumference of the conductive ring.

[0008] Furthermore, the telescopic contact includes a spring and a contact rod. The contact rod is slidably connected to the telescopic hole, the spring is located in the telescopic hole, one end of the spring is fixedly connected to the telescopic hole, the other end of the spring is fixedly connected to the contact rod, and the end of the contact rod away from the spring abuts against the motor shaft.

[0009] Furthermore, limit grooves are fixedly connected to both sides of the telescopic hole, and limit blocks are fixedly connected to both sides of the contact shaft rod near the spring end. The two limit blocks are slidably connected to the two limit grooves respectively.

[0010] Furthermore, a detachable component is connected to the outer side of the mounting ring, and the detachable component is detachably connected to the motor housing.

[0011] Furthermore, the detachable component includes several U-shaped mounting brackets and several bolts. Both ends of the several U-shaped mounting brackets are fixedly connected to the outer ring wall of the mounting ring. The threaded rods of the several bolts pass through the inner side of the U-shaped mounting bracket from one side and are threadedly connected to the motor housing.

[0012] Furthermore, the number of U-shaped mounting brackets is no less than two, and the U-shaped mounting brackets are equidistantly distributed along the outer circumference of the mounting ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This type of telescopic multi-contact motor grounding ring, through the telescopic contact element installed inside the conductive ring, enables movable contact between the conductive ring and the motor shaft, thereby avoiding excessive friction on the motor shaft, avoiding obstruction to the rotation of the motor shaft, and improving the contact effect between the conductive ring and the motor shaft. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall appearance and connection structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the grounding ring body connection structure of this utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the conductive ring structure of this utility model;

[0018] Figure 4 for Figure 3 Enlarged schematic diagram of the connection structure at point A.

[0019] In the diagram: 1. Motor housing; 2. Motor shaft; 3. Grounding ring body; 4. Mounting ring; 5. Conductive ring; 6. Telescopic contact; 7. U-shaped mounting bracket; 8. Bolt; 61. Spring; 62. Contact shaft rod; 63. Limiting block; 501. Telescopic hole; 502. Limiting groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figures 1 to 4 A telescopic multi-contact motor grounding ring includes a grounding ring body 3 mounted on a motor housing 1 and a motor shaft 2. The grounding ring body 3 includes a mounting ring 4 and a conductive ring 5. The conductive ring 5 is located inside the mounting ring 4 and is fixedly connected to the mounting ring 4. The mounting ring 4 is connected to the motor housing 1. A plurality of telescopic holes 501 are opened on the inner side of the conductive ring 5. Each of the plurality of telescopic holes 501 is connected to a telescopic contact 6. Each of the plurality of telescopic contact 6 is connected to the motor shaft 2.

[0022] like Figures 1 to 4 As shown, the telescopic multi-contact motor grounding ring of this utility model is similar in structure to existing motor grounding rings, such as the shaft grounding ring and motor disclosed in patent publication number CN218850573U. The main improvement of this utility model lies in improving the contact effect between the grounding ring and the motor shaft 2, such as... Figures 1 to 4 As shown, in use, the telescopic multi-contact motor grounding ring of this utility model involves placing the mounting ring 4 and the conductive ring 5 on the outside of the motor shaft 2. The conductive ring 5 is then fixed to the side of the motor housing 1 by the mounting ring 4. The conductive ring 5 contacts the motor shaft 2 located in the middle position through the telescopic contact member 6 in the inner telescopic hole 501. By utilizing the telescopic movement within the telescopic hole 501, the contact force between the telescopic contact member 6 and the motor shaft 2 can be avoided from being too strong. This ensures that the conductive ring 5 and the motor shaft 2 are in contact and conducting electricity, while reducing frictional resistance to the rotation of the motor shaft 2 and improving the contact effect between the conductive ring 5 and the motor shaft 2.

[0023] like Figures 1 to 4As shown, the number of telescopic contact elements 6 is no less than three, and the telescopic contact elements 6 are equidistantly distributed along the inner circumference of the conductive ring 5. At least three sets of telescopic contact elements 6 are provided, which can cooperate with each other to ensure that the central axis of the conductive ring 5 coincides as closely as possible with the central axis of the motor shaft 2, thereby improving the installation effect of the conductive ring 5 on the motor shaft 2.

[0024] like Figures 1 to 4 As shown, the telescopic contact 6 includes a spring 61 and a contact rod 62. The contact rod 62 is slidably connected to the telescopic hole 501. The spring 61 is located in the telescopic hole 501, with one end of the spring 61 fixedly connected to the telescopic hole 501 and the other end of the spring 61 fixedly connected to the contact rod 62. The end of the contact rod 62 away from the spring 61 abuts against the motor shaft 2. When the conductive ring 5 is installed, the spring 61 in the telescopic hole 501 pushes the contact rod 62 outward, so that the other end of the contact rod 62 abuts against the outside of the motor shaft 2. When the motor shaft 2 rotates at high speed, the contact rod 62 always abuts against the outer wall of the motor shaft 2 through the spring 61, thereby avoiding the rigid connection between the contact rod 62 and the motor shaft 2, which would cause rotational resistance and excessive wear to the motor shaft 2. At the same time, it can also be installed on motors with different motor shafts 2, improving the applicability of the motor grounding ring.

[0025] like Figure 3 and Figure 4 As shown, limiting grooves 502 are fixedly connected to both sides of the telescopic hole 501, and limiting blocks 63 are fixedly connected to both sides of the contact shaft rod 62 near the end of the spring 61. The two limiting blocks 63 are slidably connected to the two limiting grooves 502 respectively. Through the connection between the limiting blocks 63 and the limiting grooves 502, the spring 61 can prevent the contact shaft rod 62 from falling out of the telescopic hole 501 when it pushes the contact shaft rod 62 outward into the telescopic hole 501.

[0026] like Figure 1 and Figure 2 As shown, a detachable component is connected to the outer side of the mounting ring 4, and the detachable component is detachably connected to the motor housing 1. The mounting ring 4, through the detachable component, can be installed on and removed from the motor housing 1, improving the applicability of the grounding ring body 3.

[0027] like Figure 1 and Figure 2 As shown, the detachable assembly includes several U-shaped mounting brackets 7 and several bolts 8. Both ends of the U-shaped mounting brackets 7 are fixedly connected to the outer ring wall of the mounting ring 4. The threaded rods of the bolts 8 pass through the inner side of the U-shaped mounting brackets 7 from one side and are threadedly connected to the motor housing 1. During installation, the bolts 8 are passed through the middle groove of the U-shaped mounting brackets 7 and tightened into the motor housing 1. The nuts of the bolts 8 are used to press the U-shaped mounting brackets 7 against the motor housing 1, thus completing the installation of the mounting ring 4 and the conductive ring 5 on the motor housing 1 and the motor shaft 2.

[0028] like Figure 1 and Figure 2 As shown, there are at least two U-shaped mounting brackets 7, and these brackets 7 are equidistantly distributed along the outer circumference of the mounting ring 4. Having at least two U-shaped mounting brackets 7 allows for a more balanced and stable installation of the grounding ring body 3 on the motor housing 1, improving the installation effect.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A telescopic multi-contact motor grounding ring, comprising a grounding ring body (3) mounted on a motor housing (1) and a motor shaft (2), characterized in that: The grounding ring body (3) includes a mounting ring (4) and a conductive ring (5). The conductive ring (5) is located inside the mounting ring (4) and is fixedly connected to the mounting ring (4). The mounting ring (4) is connected to the motor housing (1). The conductive ring (5) has several telescopic holes (501) on its inner side. Each of the several telescopic holes (501) is connected to a telescopic contact (6). Each of the several telescopic contact (6) is connected to the motor shaft (2).

2. The telescopic multi-contact motor grounding ring according to claim 1, characterized in that: The number of the telescopic contacts (6) is not less than three, and the telescopic contacts (6) are equidistantly distributed along the inner circumference of the conductive ring (5).

3. The telescopic multi-contact motor grounding ring according to claim 1, characterized in that: The telescopic contact (6) includes a spring (61) and a contact shaft (62). The contact shaft (62) is slidably connected to the telescopic hole (501). The spring (61) is located in the telescopic hole (501). One end of the spring (61) is fixedly connected to the telescopic hole (501), and the other end of the spring (61) is fixedly connected to the contact shaft (62). The end of the contact shaft (62) away from the spring (61) abuts against the motor shaft (2).

4. A telescopic multi-contact motor grounding ring according to claim 3, characterized in that: Both sides of the telescopic hole (501) are fixedly connected to limit grooves (502), and both sides of the contact shaft rod (62) near the end of the spring (61) are fixedly connected to limit blocks (63). The two limit blocks (63) are slidably connected to the two limit grooves (502) respectively.

5. A telescopic multi-contact motor grounding ring according to claim 1, characterized in that: The mounting ring (4) is connected to a detachable component on its outer side, and the detachable component is detachably connected to the motor housing (1).

6. A telescopic multi-contact motor grounding ring according to claim 5, characterized in that: The detachable component includes several U-shaped mounting brackets (7) and several bolts (8). Both ends of several U-shaped mounting brackets (7) are fixedly connected to the outer ring wall of the mounting ring (4). The threaded rods of several bolts (8) pass through the inner side of the U-shaped mounting bracket (7) from one side and are threadedly connected to the motor housing (1).

7. A telescopic multi-contact motor grounding ring according to claim 6, characterized in that: The number of the aforementioned U-shaped mounting brackets (7) is not less than two, and the aforementioned U-shaped mounting brackets (7) are equidistantly distributed along the outer circumference of the mounting ring (4).

Images