Carbon brush holder assembly with carbon brush length protection, indication and alarm functions

Abstract

A carbon brush holder assembly with carbon brush length protection and indication alarm relates to the technical field of motors, and comprises a brush holder part and a carbon brush part, the brush holder part comprises a brush holder body, the brush holder body is internally provided with an insertion hole for the carbon brush part to pass through, the insertion hole is internally provided with an indication belt and a blocking piece, and the indication belt is located between the blocking piece and the tail end of the brush holder body; the carbon brush part comprises a carbon brush body, and the tail end of the carbon brush body is provided with a limiting piece correspondingly matched and propped against the blocking piece; the assembly can timely prevent the short carbon brush from continuously moving, and reduces the observation difficulty of the length of the carbon brush.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a carbon brush holder assembly with carbon brush length protection and indication warning. Background Art

[0002] The motor carbon brush plays an important role in the process of connecting the motor, rotating the electrical circuit and fixing the electrical circuit. As a tool for fixing and maintaining the reliable contact of the carbon brush, the brush holder fully guarantees the reliability of the rotor circuit. However, due to the frictional consumption during the contact between the carbon brush and the rotating slip ring, the brush holder needs to be equipped with a constant force spring to continuously apply a thrust to the carbon brush. Therefore, on-site operation and maintenance personnel need to continuously monitor the wear condition of the carbon brush to ensure the timely replacement of the carbon brush, avoid the open circuit of the excitation circuit caused by the exhaustion of the carbon brush, and the problem of sparking caused by the direct contact between the metal at the root of the brush braid in the carbon brush and the slip ring, so as to realize the effective cooperation between the brush holder and the carbon brush and ensure the reliable operation of the motor.

[0003] Existing motor brush holders are mainly divided into two types. One is the functional type, which only provides the functions of fixing the carbon brush and continuously applying force, and does not configure relevant carbon brush protection functions such as monitoring, alarm, and locking. The other is the comprehensive type, which is configured with relevant sensors, travel switches and other carbon brush monitoring and protection functions. Among them, the functional type brush holder does not have the monitoring and protection functions, which leads to the need for operation and maintenance personnel to continuously pay attention to the wear condition of the carbon brush during use. However, for large generator sets in hydropower stations, the number of brush holders is large and they block each other, resulting in only being able to judge the carbon brush length from the tail. This judgment method has no reference, high subjectivity, and there are misjudgment situations, and it also consumes a high labor cost. In addition, there is also the possibility of unsafe events caused by the omission of personnel monitoring, and the reliability is poor.

[0004] Although the comprehensive type brush holder realizes the comprehensive monitoring of the carbon brush, the added accessory circuit makes the structure of the brush holder complex and large. During use, the accessory circuit will also have an interference effect on the use of the carbon brush, affecting the carbon powder collection, heat dissipation and product size of the carbon brush. In addition, the added accessory circuit will be affected by the carbon powder generated by friction, and there is a risk of short circuit and burnout of the monitoring circuit components. In addition, the brush holder is used near the rotating equipment. If the accessory circuit is not fixed reliably, there is also a risk of adhesion and dragging with the rotating part.

[0005] Finally, neither of these two types of brush holders takes effective blocking measures when the carbon brush length is too short to prevent the contact between the root of the brush braid of the shorter carbon brush and the slip ring. Only monitoring means are taken, and still rely on manual intervention.

[0006] Chinese Patent (CN204030221U) discloses a brush holder. The brush holder is provided with a tensioning device on the mounting base that can bring the mounting base closer. After the carbon brush on the brush holder is used up, the tensioning device can spring open the mounting base. The mounting base is equipped with a limiting block. When the mounting base does not need to pop out, the rotation of the mounting base can be restricted through the limiting block. The limiting block is limited by a clamping block and a clamping groove. An electromagnet controlled by a travel switch is provided on the base. When the carbon brush is used up, the travel switch closes, the electromagnet is energized, the clamping block is attracted under the magnetic force of the electromagnet, and the limiting device is unlocked, realizing the automatic unlocking of the limiting device; however, this brush holder still has the problems of a comprehensive brush holder.

[0007] Therefore, we propose a brush holder assembly that can timely prevent the shorter carbon brush from continuing to move and reduce the difficulty of observing the length of the carbon brush. Summary of the Utility Model

[0008] In order to overcome the deficiencies in the background technology, the present utility model discloses a carbon brush holder assembly with carbon brush length protection and indication warning.

[0009] To achieve the above-mentioned invention purpose, the present utility model adopts the following technical solutions:

[0010] A carbon brush holder assembly with carbon brush length protection and indication warning includes a brush holder part and a carbon brush part. The brush holder part includes a brush holder body. A jack for the carbon brush part to pass through is provided inside the brush holder body. An indicating strip and a blocking member are provided inside the jack, and the indicating strip is located between the blocking member and the tail end of the brush holder body.

[0011] The carbon brush part includes a carbon brush body. A limiting member corresponding to and cooperating with the blocking member is provided at the tail end of the carbon brush body.

[0012] Preferably, a ring groove is provided on the inner wall surface of the jack, and the indicating strip is attached to the ring groove.

[0013] Preferably, the indicating strip includes a parallel warning indicating strip and a blocking indicating strip, and the two indicating strips are arranged along the length direction of the brush holder body. The blocking indicating strip is located between the warning indicating strip and the blocking member.

[0014] Preferably, the distance between the warning indicating strip and the blocking indicating strip is 13 - 18 mm.

[0015] Preferably, the indicating strip is set as a reflective strip.

[0016] Preferably, the blocking member is set as two retaining platforms, and the two retaining platforms are respectively located on one inner side surface of the inner jack of the brush holder. The limiting member is set as two baffle plates.

[0017] Preferably, a clamping strip is provided on the side surface of each of the two baffles, a clamping groove cooperating with the corresponding clamping strip is respectively provided on the two side surfaces of the brush holder body, and the end of the clamping groove is located at the blocking member.

[0018] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0019] A carbon brush holder assembly with carbon brush length protection and indication warning disclosed by the utility model

[0020] 1. The length of the carbon brush can be directly indicated by the indicating strip, which is convenient for the staff to observe the length of the carbon brush;

[0021] 2. Through the blocking member and the limiting member, the advancing distance of the carbon brush can be restricted, and the problem of sparking caused by the direct contact between the metal at the root of the brush braid in the carbon brush and the slip ring can be avoided. Description of the Drawings

[0022] Figure 1 is a structural schematic diagram of the utility model;

[0023] Figure 2 is a structural schematic diagram of the carbon brush part;

[0024] Figure 3 is a structural schematic diagram of the clamping strip.

[0025] In the figure: 1. Brush holder part; 11. Brush holder body; 12. Jack; 13. Indicating strip; 131. Warning indicating strip; 132. Blocking indicating strip; 14. Blocking member; 15. Clamping groove; 2. Carbon brush part; 21. Carbon brush body; 22. Limiting member; 23. Clamping strip. Detailed Embodiment

[0026] Next, the technical solution of the utility model will be described in conjunction with the drawings in the embodiments of the utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, they are only corresponding to the drawings of the utility model for the convenience of describing the utility model, rather than indicating or implying that the device or element referred to must have a specific orientation:

[0027] Combined with the attached Figure 1-2A carbon brush holder assembly with carbon brush length protection and indication warning, and one of the embodiments is as follows: It includes a brush holder part 1 and a carbon brush part 2. The brush holder part 1 includes a brush holder body 11. An insertion hole 12 for the carbon brush part 2 to pass through is provided in the brush holder body 11. An indication strip 13 and a blocking member 14 are provided in the insertion hole 12, and the indication strip 13 is located between the blocking member 14 and the tail end of the brush holder body 11. The carbon brush part 2 is inserted from the tail end of the brush holder body 11 and extends out from the head end of the brush holder body 11. Generally, after the carbon brush part 2 extends out a relatively short length, it will contact the rotating slip ring.

[0028] It should be noted that under normal circumstances, the carbon brush part 2 will press the indication strip 13. During the process of the gradual consumption of the carbon brush part 2, the tail end face of the carbon brush part 2 will gradually move towards the head end of the brush holder body 11. When the carbon brush part 2 is consumed to a certain extent, the indication strip 13 will be exposed. By the exposed indication strip 13, the purpose of reminding the operator to replace the carbon brush part 2 can be achieved.

[0029] The carbon brush part 2 includes a carbon brush body 21. A limiting member 22 corresponding to and cooperating with the blocking member 14 is provided at the tail end of the carbon brush body 21.

[0030] The cooperation between the limiting member 22 and the blocking member 14 can not only prevent the carbon brush part 2 from detaching from the brush holder body 11, but also limit the moving distance of the carbon brush body 21, thereby effectively avoiding the problem of the excitation circuit being broken due to the carbon brush being exhausted, and the problem of sparking caused by the direct contact between the metal at the root of the brush braid in the carbon brush and the slip ring.

[0031] On the basis of the above first embodiment, the brush holder part 1 is further improved. Specifically: A ring groove is provided on the inner wall surface of the insertion hole 12, and the indication strip 13 is attached to the ring groove. Since the carbon brush part 2 needs to frequently rub against the inner side surface of the brush holder body 11, after the indication strip 13 is located in the ring groove, the contact between the carbon brush part 2 and the indication strip 13 can be effectively avoided, thereby improving the service life of the indication strip 13.

[0032] Moreover, for the motor, the carbon brush holder assembly is correspondingly arranged around the rotating slip ring. Therefore, when the staff checks the indication strips 13 of each brush holder part 1, the positions that can be observed for each brush holder part 1 are different. Therefore, by providing the ring groove and the indication strip 13 also being correspondingly arranged around the insertion hole 12, the staff can observe the exposure situation of the indication strip 13 in each brush holder part 1 at the same position.

[0033] Based on the above first embodiment, the indicating strip 13 is further improved as follows: The indicating strip 13 includes a parallel warning indicating strip 131 and a blocking indicating strip 132, and the two indicating strips 13 are arranged along the length direction of the brush holder body 11. The blocking indicating strip 132 is located between the warning indicating strip 131 and the blocking member 14;

[0034] After the warning indicating strip 131 and the blocking indicating strip 132 are exposed, they have different meanings to the staff;

[0035] If the staff finds that neither the warning indicating strip 131 nor the blocking indicating strip 132 is exposed, it means that the carbon brush body 21 in the carbon brush part 2 is at a safe length, and the staff does not need to replace the carbon brush body 21;

[0036] If the staff finds that the warning indicating strip 131 is exposed while the blocking indicating strip 132 is still blocked by the carbon brush part 2, it means that the length of the carbon brush body 21 in the carbon brush part 2 is already short, and the staff needs to replace the carbon brush body 21 as soon as possible;

[0037] If the staff finds that both the warning indicating strip 131 and the blocking indicating strip 132 are exposed, it means that the limiting member 22 in the carbon brush part 2 has abutted against the blocking member 14, and the carbon brush body 21 is about to be exhausted. The staff should immediately replace the carbon brush body 21. And if there is a motor failure at this time, it means that the carbon brush body 21 may have been exhausted. At this time, the indicating strip 13 can be used as a basis for inspection when the motor stops working.

[0038] Particularly, the distance between the warning indicating strip 131 and the blocking indicating strip 132 is 13 - 18 mm. Since the carbon brush body 21 is in a continuous consumption state and the patrol time of the staff is uncertain, setting the distance between the warning indicating strip 131 and the blocking indicating strip 132 to 13 - 18 mm can not only make the carbon brush body 21 reach the maximum consumption as much as possible, avoid too much remaining of the carbon brush body 21 and cause waste of resources, but also ensure that the carbon brush body 21 will not be consumed to the extent of the blocking indicating strip 132 before the staff's patrol arrives at the station. The optimal distance is 15 mm.

[0039] In addition, the indicating strip 13 is set as a reflective strip. For an environment with weak light intensity, the staff usually uses lighting equipment to inspect the carbon brush holder assembly. At this time, the reflective strip can reflect the light emitted by the lighting equipment, which is beneficial to the staff's observation and reduces the difficulty of the staff's inspection of the carbon brush holder assembly;

[0040] In addition, the warning indicator tape 131 and the blocking indicator tape 132 of the indicator tape 13 can be set as reflective strips of two colors, which is helpful for the staff to distinguish them. The warning indicator tape 131 can be set to yellow, and the blocking indicator tape 132 can be set to red. This is because in life, yellow as an indicator color generally serves as a warning, and red as an indicator color generally serves as a serious alarm, which is more in line with the functions of the warning indicator tape 131 and the blocking indicator tape 132.

[0041] On the basis of the above first embodiment, the blocking member 14 is further limited, specifically: the blocking member 14 is configured as two blocking platforms, the two blocking platforms are respectively located on an inner side surface of the insertion hole 12 in the brush holder, and the limiting member 22 is configured as two blocking plates;

[0042] The carbon brush part 2 passes through between the two stop platforms, and both stop platforms can block the movement of the corresponding baffle in the carbon brush part 2 , thereby limiting the moving distance of the carbon brush part 2 .

[0043] In addition, combined with Figure 3 , a clamping strip 23 is provided on the side of the two baffles, and a clamping groove 15 matching the corresponding clamping strip 23 is provided on the two side surfaces of the brush holder body 11, and the end of the clamping groove 15 is located at the blocking member 14; when the carbon brush part 2 needs to be replaced, since the tail end of the carbon brush part 2 is already located inside the brush holder body 11, it is difficult to take out the carbon brush part 2 and replace it by conventional methods at this time, so by pulling the clamping strip 23 to move outward along the clamping groove 15, the carbon brush part 2 can be driven to separate from the brush holder body 11, and finally the carbon brush part 2 can be replaced.

[0044] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A carbon brush holder assembly with carbon brush length protection and indication alarm, characterized by: The brush holder (1) comprises a brush holder part (1) and a carbon brush part (2), wherein the brush holder part (1) comprises a brush holder body (11), wherein a plug hole (12) for the carbon brush part (2) to pass through is provided in the brush holder body (11), wherein an indicator strip (13) and a blocking member (14) are provided in the plug hole (12), and the indicator strip (13) is located between the blocking member (14) and the rear end of the brush holder body (11); The carbon brush part (2) comprises a carbon brush body (21), and a limiting member (22) correspondingly cooperating with the blocking member (14) is provided at the rear end of the carbon brush body (21).

2. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 1, characterized in that: The inner wall surface of the insertion hole (12) is provided with an annular groove, and the indicator belt (13) is attached to the annular groove.

3. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 1, characterized in that: The indication band (13) comprises a parallel warning indication band (131) and a blocking indication band (132), and the two indication bands (13) are arranged along the length direction of the brush holder body (11), and the blocking indication band (132) is located between the warning indication band (131) and the blocking member (14).

4. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 3, characterized in that: The distance between the warning indication band (131) and the blocking indication band (132) is 13-18 mm.

5. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 1, characterized in that: The indicator strip (13) is configured as a reflective strip.

6. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 1, characterized in that: The blocking member (14) is configured as two blocking platforms, the two blocking platforms are respectively located on an inner side surface of the insertion hole (12) in the brush holder, and the limiting member (22) is configured as two blocking plates.

7. The carbon brush holder assembly with carbon brush length protection and indication alarm as claimed in claim 6, characterized in that: A clamping strip (23) is provided on the side of each of the two baffles, and a clamping groove (15) matching with the corresponding clamping strip (23) is provided on the two side surfaces of the brush holder body (11), and the end of the clamping groove (15) is located at the blocking member (14).

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