Voltage Detector

Abstract

An embodiment of the present application provides a voltage detection device including a rod body, a contact, and a probe. The contact is rotatably connected to one axial end of the rod body and is used to abut against a motor shaft, and the probe is electrically connected to the contact. By rotatably connecting the contact that abuts against the motor shaft to the rod body, the contact can be rotated relative to the rod body. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body under the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding friction to rolling friction and significantly reducing the friction coefficient between the contact and the motor shaft, thereby reducing wear on the contact and extending the service life of the contact, and further extending the service life of the voltage detection device.

Description

[Technical Field]

[0001] The present application relates to the technical field of voltage testing, and more particularly to a voltage detection device. [Background technology]

[0002] When a motor operates normally, its motor shaft is in a high-voltage rotating state and generates a certain shaft voltage. To ensure the normal operation of the motor, the shaft voltage status of the motor can be detected to monitor its safety. For example, the shaft voltage status can effectively reflect the state of the motor shaft's ground insulation.

[0003] In the technical field of voltage testing, a voltage detection device that is in contact with a motor shaft rotating at high voltage for a long time is likely to suffer serious wear, which will affect the service life of the voltage detection device. Summary of the Invention [Means for solving the problem]

[0004] The embodiments of the present application provide a voltage detection device, which can improve the service life of the voltage detection device.

[0005] An embodiment of the present application provides a voltage detection device including a rod body, a contact, and a probe, wherein the contact is rotatably connected to one axial end of the rod body and is used to abut against a motor shaft, and the probe is electrically connected to the contact.

[0006] By adopting the above structure, the contact that abuts against the motor shaft is rotatably connected to the rod body, allowing the contact to rotate relative to the rod body. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body due to the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding to rolling friction, significantly reducing the friction coefficient between the contact and the motor shaft, thereby reducing wear on the contact and extending the service life of the contact and further extending the service life of the voltage detection device.

[0007] In some alternative embodiments of the present application, the rod body has a receiving cavity that penetrates the rod body along the axial direction, and at least a portion of the probe is received in the receiving cavity and contacts the contact.

[0008] By adopting the above structure and providing the receiving cavity, the structure of the rod body can be fully utilized and space can be provided for the installation of the probe.

[0009] In some alternative embodiments of the present application, the voltage detection device further includes a rotating shaft installed in the accommodating cavity, and the contact is rotatably connected to the rod body via the rotating shaft.

[0010] By adopting the above structure and providing a rotation axis, it is possible to facilitate relative rotation between the contact and the rod body.

[0011] In some alternative embodiments of the present application, the rotation direction of the rotation axis is parallel to the axial direction.

[0012] In some alternative embodiments of the present application, in a plane perpendicular to the axial direction, the rod body includes a conductive layer having the accommodating cavity disposed therein and an insulating layer surrounding the conductive layer, and the contact is connected to the conductive layer.

[0013] By adopting the above structure and installing the conductive layer, the receiving cavity can be made into a conductive environment. When the probe is separated from the contact, the probe will not be fully connected to the contact, which will affect the transmission of the electrical signal and therefore the detection process. At this time, when the probe comes into contact with the conductive layer, the conductive layer will establish an electrical connection with the contact, complete the transmission of the electrical signal, and improve the stress resistance of the detection device.

[0014] In some alternative embodiments of the present application, the contact is a brush head structure comprised of a plurality of conductive filaments.

[0015] By adopting the above structure and placing the contacts in the brush head structure, on the one hand, it is possible to easily extend the probe into the contacts and ensure sufficient connection of the probe to the contacts, and on the other hand, it is possible to increase the contact area between the contacts and the motor shaft and ensure connection between the contacts and the motor shaft.

[0016] In some alternative embodiments of the present application, the contacts employ conductive carbon brushes.

[0017] By adopting the above structure and placing the contact on a conductive carbon brush, the wear resistance of the contact can be effectively improved and the contact can be given a certain degree of flexibility, making it easier to attach the contact to the motor shaft.

[0018] In some alternative embodiments herein, the probe includes a contact end extending into the contact and a connection end extending from an end remote from the contact within the receiving cavity.

[0019] By adopting the above structure and installing the contact end, it is possible to easily connect the probe to the contact, and by installing the connection end, it is possible to easily connect the probe to an external device that processes electrical signals.

[0020] In some alternative embodiments of the present application, the probe further includes a connection line connected to the connection end for transmitting the electrical signal received by the contact end.

[0021] By adopting the above structure and installing a connecting wire, it is possible to easily connect the probe to an external device that processes electrical signals.

[0022] In some optional embodiments of the present application, the voltage detection device further includes a sealing member for sealing one end of the accommodating cavity remote from the contact, and the connecting wire or the connecting end can extend outside the accommodating cavity from the sealing member.

[0023] By adopting the above structure and providing a sealing member, the inside of the receiving cavity can be kept relatively sealed, reducing the influence of the external environment on the inside of the receiving cavity and improving detection accuracy.

[0024] In some alternative embodiments of the present application, the voltage detection device further includes a detection body for processing and / or displaying the electrical signal acquired by the contact, and the connecting wire is connected to the detection body.

[0025] By adopting the above structure and installing the detection body, the electrical signals obtained through detection can be effectively processed.

[0026] In some alternative embodiments of the present application, the rod body further includes a seal ring disposed outside the insulating layer.

[0027] By adopting the above structure and installing a seal ring, the mounting position can be sealed when the voltage detection device is connected to the mounting position, and when the voltage detection device is installed on a motor and an opening is installed on the motor for passing the rod body through, the seal ring is used on the opening.

[0028] Compared with the related art, in the voltage detection device of the embodiment of the present application, the contact that abuts against the motor shaft is rotatably connected to the rod body, allowing the contact to rotate relative to the rod body. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body due to the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding to rolling friction, significantly reducing the friction coefficient between the contact and the motor shaft, thereby reducing wear on the contact and extending the service life of the contact, and further extending the service life of the voltage detection device.

[0029] The features, advantages, and technical effects of exemplary embodiments of the present application are described below with reference to the drawings. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a block diagram of a voltage detection device provided in accordance with some embodiments of the present application; [Figure 2] 1 is a block diagram of a motor and a voltage detection device provided in accordance with some embodiments of the present application; [Figure 3] 1A and 1B are diagrams illustrating the configuration of a rotating shaft and contacts provided in accordance with some embodiments of the present application. [Figure 4] FIG. 2 is a block diagram of a voltage detection device provided according to some other embodiments of the present application. [Figure 5] 10A and 10B are diagrams illustrating the configuration of a rotating shaft and contacts provided in accordance with some other embodiments of the present application. [Figure 6]1 is a block diagram of a voltage detection device provided in accordance with further some embodiments of the present application.In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION OF THE INVENTION

[0031] The embodiments of the present application will be described in more detail below in conjunction with the drawings and examples. The detailed description of the following examples and the drawings are used to exemplify the principles of the present application, but do not limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0032] In the description of this application, it should be explained that, unless otherwise specified, "plurality" means two or more, and the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are solely for the purpose of facilitating and simplifying the description of this application and do not indicate or imply that the referenced device or element must have a particular orientation, be configured, or operate in a particular direction, and therefore should not be understood as limiting this application. Furthermore, terms such as "first," "second," and "third" are used solely for descriptive purposes and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but has a margin of error. "Parallel" does not mean parallel in the strict sense, but has a margin of error.

[0033] In this application, when a reference is made to an "embodiment," it means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that contradicts other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiment described in this application may be combined with other embodiments.

[0034] Any directional terms appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, and unless otherwise clearly specified or limited, the terms "attached," "coupled," and "connected" should be understood broadly to mean, for example, fixedly connected, detachably connected, integrally connected, directly connected, or indirectly connected via an intermediate medium. Those skilled in the art will be able to understand the specific meanings of the above terms in the present application depending on the specific circumstances.

[0035] In the technical field of voltage testing, there are various testing environments, and some environments have a significant impact on voltage testing operations such as motor voltage testing. When a motor operates normally, it generates a certain shaft voltage, and measuring the shaft voltage can help detect ground insulation defects on the motor shaft and reduce safety risks on the motor shaft.

[0036] The inventors have noticed that in related art, when testing shaft voltage, it is necessary to extract a voltage signal from the surface of the motor shaft rotating at high speed, and in order to connect the surface of the motor shaft to an external testing device, it is usually necessary to introduce a contact and connect it to the surface of the motor shaft. However, since the contact needs to be connected to the motor shaft rotating at high speed for a long time, the contact will be subject to serious wear and will shorten the service life of the voltage detection device.

[0037] In order to alleviate the problem of the voltage detection device having a relatively short service life, the inventors conducted research and found that by adjusting the structure of the contact, the contact can be rotatably connected to a structure that fixes the contact. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body under the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding to rolling friction, significantly reducing the coefficient of friction between the contact and the motor shaft, thereby reducing wear on the contact and extending the service life of the contact, and further extending the service life of the voltage detection device.

[0038] Based on the above considerations, the inventors of the present application have conducted extensive research and designed a voltage detection device.

[0039] Fig. 1 is a structural diagram of a voltage detection device provided by some embodiments of the present application. As shown in Fig. 1, the voltage detection device includes a rod body 1, a contact 2, and a probe 3. The contact 2 is rotatably connected to one end of the rod body 1 in the axial direction (x-axis direction in the figure), and is used to abut against a motor shaft 10, and the probe 3 is electrically connected to the contact 2.

[0040] The rod body 1 is used to provide a support body for the voltage detection device, facilitating connection between the voltage detection device and the mounting location. For example, the mounting location is a motor 100, and the rod body 1 can be connected to the casing 101 of the motor 100.

[0041] The contact 2 is used to contact the surface of the motor shaft 10 and extract an electrical signal (e.g., a voltage signal) therefrom. Illustratively, the contact 2 may be a contact rod, a brush, or the like made of a conductive material.

[0042] The probe 3 is used to observe the electrical signal extracted from the contact 2, and a differential probe 3 or the like can be employed.

[0043] 2 is a structural diagram of a motor 100 and a voltage detection device provided according to some embodiments of the present application. Referring to FIG. 2, taking the motor 100 as an example, the motor 100 includes a casing 101 and a motor shaft 10, a portion of the motor shaft 10 is installed inside the casing 101, and the motor shaft 10 can rotate at high speed relative to the casing 101, and at least a portion of the rod body 1 is located inside the casing 101.

[0044] The contact 2 that abuts against the motor shaft 10 is rotatably connected to the rod body 1, so that the contact 2 can rotate relative to the rod body 1. When the contact 2 abuts against the rotating motor shaft 10, the contact 2 can rotate relative to the rod body 1 due to the influence of the motor shaft 10, changing the friction between the contact 2 and the motor shaft 10 from sliding to rolling friction, significantly reducing the coefficient of friction between the contact 2 and the motor shaft 10, thereby reducing wear on the contact 2 and extending the service life of the contact 2 and further extending the service life of the voltage detection device.

[0045] Alternatively, referring to FIG. 2, the rod body 1 can extend from the outside of the casing 101 to the inside of the casing 101 and the contact 2 can abut against the motor shaft 10.

[0046] Optionally, the contact 2 and the rod body 1 can be connected via a rotating structure (such as a rotating shaft 4).

[0047] Alternatively, the rod body 1 may be a hollow rod, and the probe 3 extends to one side of the contact 2 through the hollow structure in the rod body 1 and is connected to the contact 2 to complete the electrical connection between the probe 3 and the contact 2.

[0048] Alternatively, the rod body 1 may adopt a conductive material, the contact 2 is electrically connected to the rod body 1, and the rod body 1 is electrically connected to the probe 3, further realizing the connection between the contact 2 and the probe 3.

[0049] 1 , in some selectable embodiments of the present application, the rod body 1 has an accommodating cavity 11 penetrating the rod body 1 along the axial direction of the rod body 1 (the x-axis direction in the figure), the contact 2 is rotatably connected to one end of the rod body 1 along the axial direction, and at least a portion of the probe 3 is accommodated in the accommodating cavity 11 and contacts the contact 2. By providing the accommodating cavity 11, the structure of the rod body 1 can be fully utilized to provide space for installing the probe 3.

[0050] Alternatively, the probe 3 may be a rod-like structure and extend along an axial direction within the receiving cavity 11 .

[0051] 1 , in some optional embodiments of the present application, the voltage detection device further includes a rotation shaft 4 disposed in the receiving cavity 11 for rotatably connecting the contact 2 to the rod body 1. By providing the rotation shaft 4, it is possible to facilitate relative rotation between the contact 2 and the rod body 1.

[0052] Alternatively, the contact 2 may have a ring-like structure, and the rotation axis 4 is connected to the center of the contact 2, allowing the contact 2 to rotate around the center of the circle.

[0053] Optionally, the installation direction of the rotation axis 4 is parallel to the radial direction of the rod body 1 .

[0054] 3 is a configuration diagram of the rotating shaft 4 and the contact 2 provided according to some embodiments of the present application. As shown in FIGS. 1 to 3, in some selectable embodiments of the present application, the rotation direction of the rotating shaft 4 (direction w in the drawings) is parallel to the axial direction. By making the rotation direction of the rotating shaft 4 parallel to the axial direction, the rotation direction of the contact 2 can be made approximately parallel to the rotation direction of the motor shaft 10, making it easier for the contact 2 to rotate using force from the motor shaft 10.

[0055] Fig. 4 is a structural diagram of a voltage detection device provided according to some other embodiments of the present application, and Fig. 5 is a structural diagram of a rotating shaft 4 and a contact 2 provided according to some embodiments of the present application. Referring to Figs. 4 and 5, the rotation direction of the rotating shaft 4 (direction w in the drawings) is optionally perpendicular to the axial direction. By making the rotation direction of the rotating shaft 4 perpendicular to the axial direction, the contact 2 can be essentially in a fixed position when it rotates, reducing the space required for rotation of the contact 2 and reducing the impact of rotation of the contact 2 on other structures at the detection position.

[0056] 4 and 5, for example, when the rotation direction of the rotating shaft 4 is perpendicular to the axial direction, the rotating shaft 4 includes an inner ring 41, an outer ring 42, and a ball bearing 43 installed between the inner ring 41 and the outer ring 42, the inner ring 41 can rotate relative to the outer ring 42, the inner ring 41 is connected to the contact 2, and the outer ring 42 is connected to the side wall of the receiving cavity 11. By installing the inner ring 41, the outer ring 42, and the ball bearing 43, a rotatable connection between the contact 2 and the rod body 1 can be realized.

[0057] 1 and 4, in some alternative embodiments of the present application, in a plane perpendicular to the axial direction, the rod body 1 includes a conductive layer 12 having a receiving cavity 11 disposed therein and an insulating layer 13 surrounding the conductive layer 12, and the contacts 2 are connected to the conductive layer 12. The conductive layer 12 can create a conductive environment in the receiving cavity 11, so that when the probes 3 are disengaged from the contacts 2, the probes 3 will not be fully connected to the contacts 2, which will affect the transmission of electrical signals and thus the detection process. At this time, when the probes 3 come into contact with the conductive layer 12, the conductive layer 12 will establish an electrical connection with the contacts 2, completing the transmission of the electrical signals and improving the stress resistance of the detection device.

[0058] Alternatively, the conductive layer 12 can be made of copper, which allows the conductive layer 12 to have good conductive properties.

[0059] 1 and 3, in some alternative embodiments of the present application, the contact 2 is a brush head structure composed of multiple conductive filaments. By placing the contact 2 in the brush head structure, on the one hand, it is possible to easily extend the probe 3 into the contact 2, thereby ensuring sufficient connection of the probe 3 to the contact 2, and on the other hand, it is possible to increase the contact area between the contact 2 and the motor shaft 10, thereby ensuring connection between the contact 2 and the motor shaft 10.

[0060] Alternatively, the contact 2 may be a roller brush head-like structure.

[0061] In some alternative embodiments of the present application, a conductive carbon brush is used for the contact 2. By placing the contact 2 on the conductive carbon brush, the wear resistance of the contact 2 can be effectively improved and the contact 2 can have a certain flexibility, which makes it easier to attach the contact 2 to the motor shaft 10.

[0062] 6 is a structural diagram of a voltage detection device provided according to some further embodiments of the present application. As shown in FIG. 6, in some optional embodiments of the present application, the probe 3 includes a contact end 31 extending into the contact 2 and a connection end 32 extending from one end away from the contact 2 within the receiving cavity 11. The contact end 31 can be provided to facilitate connection between the probe 3 and the contact 2, and the connection end 32 can be provided to facilitate connection between the probe 3 and an external device that processes electrical signals.

[0063] 2 and 6, in some alternative embodiments of the present application, the probe 3 further includes a connection line 33 connected to the connection end 32 for transmitting the electrical signal received by the contact end 31. The provision of the connection line 33 can facilitate connection between the probe 3 and an external device that processes the electrical signal.

[0064] 2 and 6, in some optional embodiments of the present application, the voltage detection device further includes a sealing member 5 for sealing one end of the receiving cavity 11 away from the contact 2, and the connecting wire 33 or the connecting end 32 can extend outside the receiving cavity 11 from the sealing member 5. By installing the sealing member 5, the inside of the receiving cavity 11 can be relatively sealed, which can reduce the influence of the external environment on the inside of the receiving cavity 11 and improve detection accuracy.

[0065] Alternatively, the sealing member 5 may be a plug-like structure and is used to plug one end of the receiving cavity 11 away from the contact 2, and illustratively the sealing member 5 may be made of an insulating material such as rubber, plastic, etc.

[0066] 2 and 6, in some optional embodiments of the present application, the voltage detection device further includes a detection body 6 for processing and / or displaying the electrical signal acquired by the contact 2, and the connection line 33 is connected to the detection body 6. By installing the detection body 6, the detected and acquired electrical signal can be effectively processed.

[0067] Alternatively, the detection body 6 may employ an oscilloscope.

[0068] Optionally, referring to FIG. 2, taking the voltage detection of the motor shaft 10 as an example, the positive side of the probe 3 is connected to the contact 2, and the negative side of the probe 3 is connected to the casing 101.

[0069] As shown in FIGS. 1 and 2, in some alternative embodiments of the present application, the rod body 1 is further provided with a seal ring 7 disposed on the outside of the insulating layer 13 .

[0070] By installing the seal ring 7, the mounting position can be sealed when the voltage detection device is connected to the mounting position, and when the voltage detection device is installed on the motor 100 and an opening for passing the rod body 1 is installed on the motor 100, the seal ring 7 is used in the opening.

[0071] Optionally, the seal ring 7 is installed outside the casing 101 and located at the connection between the casing 101 and the rod body 1, and is used to seal the slit at the connection between the casing 101 and the rod body 1. For example, the seal ring 7 may be an oil seal ring.

[0072] Some alternative embodiments of the present application provide a voltage detection device including a rod body 1, a contact 2, and a probe 3. The contact 2 is rotatably connected to the rod body 1 and is adapted to abut against a motor shaft 10. The probe 3 is fixed to the rod body 1 and adapted to be electrically connected to the contact 2. The rod body 1 has an accommodating cavity 11 penetrating the rod body 1 along its axial direction. The contact 2 is rotatably connected to one end of the rod body 1 along the axial direction. At least a portion of the probe 3 is accommodated in the accommodating cavity 11 and contacts the contact 2. The voltage detection device further includes a rotation shaft 4 disposed within the accommodating cavity 11 and for rotatably connecting the contact 2 to the rod body 1, the rotation direction of the rotation shaft 4 being parallel to the axial direction. In a plane perpendicular to the axial direction, the rod body 1 includes a conductive layer 12 having a receiving cavity 11 disposed therein and an insulating layer 13 surrounding the conductive layer 12. The contact 2 is connected to the conductive layer 12. The contact 2 has a brush head structure composed of multiple conductive filaments. The probe 3 includes a contact end 31 extending into the contact 2 and a connecting end 32 extending from one end remote from the contact 2 in the receiving cavity 11. The probe 3 further includes a connecting wire 33 connected to the connecting end 32 for transmitting an electrical signal received by the contact end 31. The voltage detection device further includes a sealing member 5 for sealing the end remote from the contact 2 in the receiving cavity 11. The connecting wire 33 or the connecting end 32 can extend from the sealing member 5 to the outside of the receiving cavity 11. The voltage detection device further includes a detection body 6 for processing and / or displaying the electrical signal acquired by the contact 2. The connecting wire 33 is connected to the detection body 6. The rod body 1 is further provided with a seal ring 7 disposed on the outside of the insulating layer 13 .

[0073] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto without departing from the scope of the present application, and equivalents may be substituted for components therein, and each technical feature mentioned in each embodiment may be combined in any manner unless there is a particular structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the utility model registration claims. [Explanation of symbols]

[0074] 100 motor, 10 motor shaft, 101 casing, 1 rod body, 11 accommodating cavity, 12 conductive layer, 13 insulating layer, 2 contact, 3 probe, 31 contact end, 32 connecting end, 33 connecting wire, 4 rotating shaft, 41 inner ring, 42 outer ring, 43 ball bearing, 5 sealing member, 6 detection body, 7 sealing ring

Claims

1. A rod body; a contact rotatably connected to one end of the rod body in the axial direction and used to abut against a motor shaft; a probe electrically connected to the contact; Voltage detection device.

2. the rod body has a receiving cavity that penetrates the rod body along the axial direction, and at least a portion of the probe is received in the receiving cavity and contacts the contact; The voltage detection device according to claim 1 .

3. The voltage detection device further includes a rotating shaft installed in the accommodating cavity, and the contact is rotatably connected to the rod body via the rotating shaft. The voltage detection device according to claim 2 .

4. The rotation direction of the rotation shaft is parallel to the axial direction. The voltage detection device according to claim 3 .

5. In a plane perpendicular to the axial direction, the rod body includes a conductive layer in which the receiving cavity is located and an insulating layer surrounding the conductive layer, and the contact is connected to the conductive layer. The voltage detection device according to any one of claims 2 to 4.

6. The contact is a brush head structure composed of a plurality of conductive filaments. The voltage detection device according to any one of claims 1 to 5.

7. The contacts are conductive carbon brushes. The voltage detection device according to claim 6.

8. The probe includes a contact end extending into the contact and a connection end extending from an end remote from the contact within the receiving cavity. The voltage detection device according to any one of claims 1 to 7.

9. The probe further includes a connection line connected to the connection end for transmitting an electrical signal received by the contact end. The voltage detection device according to claim 8.

10. The voltage detection device further includes a sealing member for sealing an end of the accommodating cavity remote from the contact, and the connecting wire or the connecting end can extend from the sealing member to the outside of the accommodating cavity. The voltage detection device according to claim 9.

11. The voltage detection device further includes a detection body for processing and / or displaying the electrical signal acquired by the contact, and the connecting wire is connected to the detection body. The voltage detection device according to claim 10.

12. The rod body further includes a seal ring disposed on the outside of the insulating layer. The voltage detection device according to claim 5 .

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