Electric brush structure
By introducing elastic support plates and pressure blocks into the brush structure, an automatic alarm is triggered when the carbon brush wears to its limit, solving the problem of no alarm indication after existing brush wear and realizing automatic alarm and timely replacement of the motor.
Patent Information
- Application Number
- CN202422941092.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-30
AI Technical Summary
The existing brushes lack an alarm function after wear, which makes it impossible for users to judge the wear condition in time, and the end cover needs to be opened for inspection.
Design a brush structure that utilizes the cooperation of an elastic support plate and a pressure block. When the carbon brush wears to its limit, the pressure block causes the elastic plate to bend and contact the contact, thus activating the alarm light circuit and providing an alarm indication.
It features an automatic alarm when the brushes wear down to their limit, facilitating timely replacement and preventing motor failures caused by wear.
Smart Images
Figure CN223502357U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of brush technology, specifically to a brush structure. Background Technology
[0002] Brushes are an essential component of motors, responsible for conducting current between rotating and stationary parts. Because they are often made of graphite, they are also called carbon brushes. Brushes are typically mounted on commutators or slip rings and are sliding contact elements with characteristics such as smoothness, wear resistance, and good conductivity.
[0003] During operation, the brushes are in constant rotating contact with the commutator, so they will inevitably wear down after prolonged use. Current brush wear detection systems lack an alarm function, making it impossible for users to accurately assess brush wear; inspection requires opening the motor's end cover. To address this, we propose a new brush structure. Utility Model Content
[0004] This invention provides a brush structure that has the advantage that when the brush wears to its limit, the pressure block drives the elastic sheet to bend and contact the contact, causing the alarm light to light up, thus solving the problems mentioned in the background art.
[0005] The technical solution of this utility model is implemented as follows: A brush structure includes two carbon brushes distributed on both sides of the commutator. The carbon brushes are respectively installed on one end of an elastic support plate, and the other end of the elastic support plate is fixed to the inner wall of the end cover. It also includes at least one strip groove disposed on the end cover and positioned corresponding to the carbon brush. A pressure block extending from the strip groove is provided on the end of the elastic support plate corresponding to the strip groove. A protective cover is provided outside the strip groove. A contact is provided at one end of the protective cover near the center of the end cover. An elastic sheet is provided on the side of the contact near the pressure block, and there is a certain distance between the two. When the pressure block moves towards the commutator, the pressure block drives the elastic sheet to bend and contact the contact. The elastic sheet and the contact are connected in series in the circuit connected to the alarm light.
[0006] Preferably, the distribution is symmetrical at 90° or 180°.
[0007] Preferably, the elastic sheet is provided with contacts corresponding to the contacts.
[0008] Preferably, the elastic support sheet is connected to the support plate, and pins are provided at the bottom of the support plate.
[0009] Preferably, the end cap has two symmetrical fixing grooves that correspond to the support plate, the support plate is fixed in the fixing grooves, and the pins extend to the outside of the end cap.
[0010] Preferably, the carbon brush and the elastic support sheet are detachably connected.
[0011] Preferably, the elastic support sheet has a mounting hole at its end, and one end of the carbon brush has a protrusion that is placed inside the mounting hole.
[0012] Preferably, the surface of the pressure block is provided with an insulating layer to prevent the pressure block from contacting the elastic sheet with electric shock.
[0013] Compared with the prior art, when the carbon brush is worn thin, the end of the elastic support plate will automatically move towards the commutator, allowing the pressure block to move along the strip groove. When the pressure block contacts the elastic plate, the pressure block drives the elastic plate to bend and contact the contact, so that the connection circuit of the alarm light is connected, and the alarm light will light up at this time. Attached Figure Description
[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] Figure 2 This is a schematic diagram of the structure of this utility model combined with a commutator.
[0017] Figure 3 This is a schematic diagram of the structure of this utility model combined with the end cap.
[0018] Figure 4 This is a schematic diagram of the structure of the bottom of the end cap of this utility model. Figure 1 .
[0019] Figure 5 This is a schematic diagram of the structure of the bottom of the end cap of this utility model. Figure 2 .
[0020] In the diagram: 1. Elastic support plate; 2. Pressure block; 3. Carbon brush; 4. Mounting hole; 5. Support plate; 6. Pin; 7. Protrusion; 8. Protective cover; 9. Alarm light; 10. Strip groove; 11. Commutator; 12. End cover; 13. Fixing groove; 14. Contact; 15. Elastic plate. Detailed Implementation
[0021] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0022] Reference Figures 1 to 5 This utility model provides a technical solution: a brush structure, in which the brush primarily provides electrical energy to the motor, and the brush is always in contact with the commutator 11. For example... Figure 1 As shown, the brush structure mainly includes two carbon brushes 3 distributed on both sides of the commutator 11. The two carbon brushes 3 are symmetrically distributed at 90° or 180°. This application will describe the carbon brushes 3 as being distributed at 90°.
[0023] like Figure 1 and Figure 2 As shown, carbon brushes 3 are respectively installed on one end of the elastic support plate 1, and the other end of the elastic support plate 1 is fixed to the inner wall of the end cover 12. The elastic support plate 1 is connected to the support plate 5. Pins 6 are provided at the bottom of the support plate 5. Two fixing grooves 13 corresponding to the support plate 5 are symmetrically provided in the end cover 12. The support plate 5 is fixed in the fixing groove 13. The support plate 5 is elastic and bends into a V-shaped structure during installation. The fixing groove 13 is also a V-shaped structure. When the support plate 5 is placed in the fixing groove 13, the support plate 5 can be elastically installed in the fixing groove 13, so that the support plate 5 can always remain stable.
[0024] Among them, pin 6 extends to the outside of end cover 12. Pin 6 is used to connect to the power supply, so that external power is transmitted to carbon brush 3 through pin 6, support plate 5 and elastic support piece 1 in sequence. Pin 6, support plate 5 and elastic support piece 1 are all made of copper alloy.
[0025] This application also includes at least one strip groove 10 disposed on the end cap 12 and positioned corresponding to the carbon brush 3. The number of strip grooves 10 is one or two, and there can only be one or two. An elastic support piece 1 corresponding to the strip groove 10 has a pressure block 2 extending from the strip groove 10 at its end. A protective cover 8 is disposed outside the strip groove 10, which seals and protects the strip groove 10. A contact 14 is disposed at one end of the protective cover 8 near the center of the end cap 12. An elastic piece 15 is disposed on the side of the contact 14 near the pressure block 2, and there is a certain distance between the two. One end of the contact 14 and the elastic piece 15 extends into the protective cover 8, and the other end is located outside the protective cover 8. In the initial state, the contact 14 and the elastic piece 15 are parallel and do not contact each other.
[0026] However, as the carbon brush 3 gradually wears down, causing its thickness to decrease, the end of the elastic support plate 1 will automatically move towards the commutator, allowing the pressure block 2 to travel along the strip groove 10. The length of the strip groove 10 is slightly greater than the maximum stroke of the carbon brush 3. Specifically, when the pressure block 2 moves towards the commutator 11, it causes the elastic plate 15 to bend and contact the contact 14. The elastic plate 15 and the contact 14 are connected in series in the circuit connected to the alarm light 9. Specifically, the alarm light 9 is connected to the power supply through a wire. The elastic plate 15 and the contact 14 form a "contact switch," and the pressure block 2 is the "key" to open the "contact switch." That is, the pressure block 2 will press the elastic plate 15 to move towards the contact 14. When the carbon brush 3 wears to its limit, the elastic plate 15 and the contact 14 conduct, and the alarm light 9 will then light up.
[0027] It should be noted that the contact force between the two carbon brushes 3 and the commutator 11 is roughly the same, and the coefficient of friction between the carbon brushes 3 and the commutator 11 is the same. Therefore, the wear of the two carbon brushes 3 is almost the same. So in actual use, one slot 10 is sufficient, but two slots 10 are also acceptable.
[0028] Furthermore, the carbon brush 3 is detachably connected to the elastic support plate 1, which makes it convenient to replace the used carbon brush 3. Specifically, there is a mounting hole 4 at the end of the elastic support plate 1, and a protrusion 7 at one end of the carbon brush 3. The protrusion 7 is placed in the mounting hole 4, so that the carbon brush 3 can be stably installed on the elastic support plate 1. When replacing, you only need to bend the elastic support plate 1 and replace it with a new carbon brush.
[0029] Furthermore, the surface of the pressure block 2 is provided with an insulating layer, such as an insulating coating or an insulating pad, which can prevent the pressure block 2 from contacting the elastic sheet 15 and also prevent the energy passing through the elastic sheet 15 from being transmitted to the pressure block 2.
[0030] Based on the above embodiments, it should be further explained that the alarm light 9 is an LED bead or a light-emitting diode, which can be set on the surface of the end cover 12 or in other positions of the motor.
[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A brush structure comprising two carbon brushes (3) distributed on both sides of a commutator (11), the carbon brushes (3) being respectively mounted on one end of an elastic support plate (1), the other end of the elastic support plate (1) being fixed to the inner wall of an end cap (12), characterized in that, It also includes at least one strip groove (10) disposed on the end cap (12) and positioned corresponding to the carbon brush (3); The elastic support piece (1) corresponding to the strip groove (10) is provided with a pressure block (2) extending from the strip groove (10) at its end; The outside of the strip groove (10) is provided with a protective cover (8). The protective cover (8) is provided with a contact (14) at one end near the center of the end cover (12). An elastic piece (15) is provided on the side of the contact (14) near the pressure block (2) and there is a certain distance between the two. When the pressure block (2) moves toward the commutator (11), the pressure block (2) causes the elastic sheet (15) to bend and contact the contact (14), and the elastic sheet (15) and the contact (14) are connected in series in the circuit connected to the alarm light (9).
2. The brush structure as described in claim 1, characterized in that, The two carbon brushes (3) are symmetrically distributed at 90° or 180°.
3. The brush structure as described in claim 1, characterized in that, The elastic sheet (15) is provided with a contact point corresponding to the contact (14).
4. The brush structure as described in claim 1, characterized in that, The elastic support sheet (1) is connected to the support plate (5), and pins (6) are provided at the bottom of the support plate (5).
5. The brush structure as described in claim 4, characterized in that, The end cap (12) is symmetrically provided with two fixing grooves (13) that correspond to the support plate (5) respectively. The support plate (5) is fixed in the fixing groove (13), and the pin (6) extends to the outside of the end cap (12).
6. The brush structure as described in claim 1, characterized in that, The carbon brush (3) is detachably connected to the elastic support plate (1).
7. The brush structure as described in claim 6, characterized in that, The elastic support plate (1) has a mounting hole (4) at its end, and the carbon brush (3) has a protrusion (7) at one end, which is placed inside the mounting hole (4).
8. The brush structure as described in claim 1, characterized in that, The surface of the pressure block (2) is provided with an insulating layer to prevent the pressure block (2) from contacting the elastic sheet (15).