Carbon brush cleaning and cooling device for an electric machine

Abstract

This invention relates to the field of motor technology, and in particular to a carbon brush cleaning and cooling device for motors, comprising a fan, at least one air duct, and a fixing assembly. The air duct is mounted above the motor carbon brush assembly, with one end serving as an air inlet and the other end closed. Several ventilation holes facing the carbon brushes are provided at the bottom of the air duct. The fan's outlet is connected to the air inlet to supply cooling air to the air duct. The fixing assembly is connected to both the air duct and the motor body, detachably securing the air duct to the motor body. This invention features a simple structure, small footprint, and detachable installation on the motor body via the fixing assembly, requiring no modification to existing equipment. It is suitable for various exciters, back-pressure generators, and other motors, offering convenient installation and maintenance, and providing both cleaning and cooling functions.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a carbon brush cleaning and cooling device for motors. Background Technology

[0002] In large exciters, back-voltage generators, and other motor equipment, external DC power is introduced into the rotor coils through the sliding contact between the carbon brush assembly and the rotating slip ring. However, the sliding friction between the carbon brush and the slip ring generates a large amount of heat, causing the carbon brush temperature to rise, which may lead to carbon brush burnout or even fire in severe cases. Simultaneously, the carbon brushes wear down continuously during operation, and the resulting carbon dust easily accumulates inside the carbon brush assembly. Long-term accumulation reduces the insulation performance between the positive and negative poles of the carbon brush and between the carbon brush and the motor body, affecting the safe and reliable operation of the equipment.

[0003] Currently, while some large motors have fans installed between the slip rings to assist cooling, this structure occupies a large space and is only suitable for ultra-large motors. The vast majority of motors still rely on natural cooling and lack effective cleaning and cooling methods. Therefore, there is an urgent need for a device that is simple in structure, easy to install, and combines cleaning and cooling functions. Summary of the Invention

[0004] The purpose of this invention is to provide a carbon brush cleaning and cooling device for an electric motor, which can solve the above-mentioned technical problems.

[0005] This invention provides a carbon brush cleaning and cooling device for an electric motor, comprising a fan, at least one air duct, and a fixing assembly; wherein, The air duct is mounted above the motor carbon brush assembly. One end of the air duct is an air inlet, and the other end is closed. Several ventilation holes facing the carbon brush are opened at the bottom of the air duct. The air outlet of the fan is connected to the air inlet to supply cooling air to the air duct; The fixing components are connected to the air duct and the motor body respectively, and are used to detachably fix the air duct to the motor body.

[0006] Preferably, the duct is an arc-shaped rigid plastic tube, and its arc shape matches the arrangement shape of the carbon brush assembly.

[0007] Preferably, the air duct includes a first air duct and a second air duct arranged in parallel, and the first air duct and the second air duct are fixedly connected by at least one connecting rod.

[0008] Preferably, the fixing assembly includes a fixing rod and a hanging rod; the fixing rod includes a first buckle, a first connecting tube, and a first suction cup, the first buckle being used to hold the air duct, and the first suction cup being a magnetic suction cup for adsorbing onto the motor body; the hanging rod includes a second buckle, a second connecting tube, a universal joint, and a second suction cup, the second buckle being used to hold the air duct, the universal joint being used to adjust the angle, and the second suction cup being a magnetic suction cup for adsorbing onto the motor body.

[0009] Preferably, there are two fixing rods, which are respectively clamped at both ends of the second air duct; and one hanging rod, which is clamped at the middle part of the first air duct, forming a three-point fixing structure.

[0010] Preferably, the connecting rod includes two third clips and a third connecting tube connecting the two third clips, the length of which is determined according to the distance between the two sets of carbon brush assemblies.

[0011] Preferably, the connecting pipes of the fixing rod, connecting rod, and hanging rod are all hollow structures.

[0012] Preferably, both the first and second suction cups are made of magnetic material and are entirely covered with a plastic layer.

[0013] Preferably, the air inlet side of the fan is provided with a filter and an air volume regulating door. The filter is used to prevent foreign objects from being sucked in, and the air volume regulating door is used to regulate the output air volume of the fan.

[0014] Preferably, the device is also used for cooling the bearings of the motor by installing air ducts above the bearings for ventilation and cooling.

[0015] Beneficial effects: This invention utilizes a fan and ductwork to continuously supply cooling air to the carbon brush assembly. Ventilation holes precisely guide the airflow to the carbon brush surface, forcing convection heat dissipation to effectively reduce carbon brush temperature rise and prevent burnout or fire risks. Simultaneously, it blows away accumulated carbon dust, preventing it from reducing insulation performance, thus significantly improving the safety and reliability of motor operation. Furthermore, the device has a simple structure, occupies little space, and can be detachably installed on the motor body using fixing components, requiring no modification to existing equipment. It is suitable for various exciters, back-pressure generators, and other motors, offering convenient installation and maintenance, and combining cleaning and cooling functions. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the positional relationship between the air duct and the carbon brush assembly in this invention; Figure 3 This is a schematic diagram of the structure of the fixing rod in this invention; Figure 4 This is a schematic diagram of the structure of the suspension rod in this invention; Figure 5 This is a schematic diagram of the connecting rod in this invention; Figure 6 This is an installation effect diagram of the motor cooling device arranged at both ends of the carbon brush in this invention; Figure 7 This is an installation effect diagram of the motor bearing cooling device in this invention; Figure 8 This is a schematic diagram of the carbon brush assembly in this invention.

[0018] Explanation of reference numerals in the attached drawings: 1-Fan, 201-First air duct, 202-Second air duct, 301-Air inlet, 302-Ventilation hole, 4-Motor body, 5-Fixing rod, 501-First buckle, 502-First connecting pipe, 503-First suction cup, 6-Hanging rod, 601-Second buckle, 602-Second connecting pipe, 603-Second suction cup, 604-Universal joint, 7-Connecting rod, 701-Third buckle, 702-Third connecting pipe, 8-T-joint, 9-Filter screen, 10-Airflow regulating door, 11-Rotor, 12-Cable, 13-Slip ring, 14-Carbon brush, 15-Brush holder, 16-Brush braid, 17-Conductive plate, 18-Insulating plate. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] To better understand the structure of the carbon brushes in an electric motor, such as Figure 8 As shown, the working principle of the carbon brush assembly is as follows: The carbon brush assembly is located above the motor slip ring 13. The motor has two slip rings, and each slip ring corresponds to a set of carbon brush assemblies. The positive and negative terminals of the external DC power supply are connected to the two sets of carbon brush assemblies respectively. The carbon brush assembly makes sliding contact with the slip ring 13 through the carbon brush 14, so that the external DC power supply can be introduced into the coil of the motor rotor 11 through the slip ring 13. The carbon brush assembly is connected as follows: the external DC power cable 12 is connected to the conductive plate 17. Several brush holders 15 with square holes are fixed on the conductive plate 17. The carbon brush 14 is inserted into the brush holder 15 from above, and the bottom of the carbon brush 15 contacts the slip ring 13. There is a spring plate on the brush holder 15 to press the carbon brush 14 from top to bottom onto the slip ring 13. The carbon brush 14 has a lead-out brush braid 16 connected to the conductive plate 17. The external power cable 12 is also connected to the conductive plate 17. In this way, the DC power is transmitted through the brush braid 16, the carbon brush 14, and the slip ring 13. There is an insulating plate 18 between the two sets of carbon brush assemblies. The two sets of carbon brush assemblies are fixed to the insulating plate, and the insulating plate is fixed to the motor body.

[0023] Example 1 like Figure 1-5 As shown, this embodiment provides a carbon brush cleaning and cooling device for an electric motor, used for two sets of carbon brush assemblies arranged on the same side of the motor. The device includes: a fan 1, a first air duct 201, a second air duct 202, two fixing rods 5, two connecting rods 7, a hanging rod 6, and a tee 8.

[0024] Both the first duct 201 and the second duct 202 are curved rigid plastic tubes, with the size of the arc determined according to the size of the carbon brush assembly. The two ducts are arranged in parallel, with one end closed and the other end serving as an air inlet 301. Multiple ventilation holes 302 are provided below the ducts facing the carbon brush, and the air blown out of the ventilation holes is fan-shaped to expand the cooling and cleaning range.

[0025] Two connecting rods 7 are respectively connected to the two ends of the first air duct 201 and the second air duct 202, fixing them into one piece. Each connecting rod includes two third clips 701 and a third connecting pipe 702 connecting the two third clips. The length of the third connecting pipe 702 is determined according to the distance between the two sets of carbon brushes.

[0026] Two fixing rods 5 are respectively secured to both ends of the second air duct 202. Each fixing rod includes a first buckle 501, a first connecting pipe 502, and a first suction cup 503. The first suction cup 503 is made of magnetic material and covered with plastic, and is attached to the motor body. A hanging rod 6 is secured to the middle part of the first air duct 201. The hanging rod includes a second buckle 601, a second connecting pipe 602, a universal joint 604, and a second suction cup 603. After adjusting the angle through the universal joint 604, the second suction cup 603 is attached to the motor body, forming a three-point fixing structure.

[0027] The air inlets of the first air duct 201 and the second air duct 202 are respectively connected to the two ports of the tee 8, and the other end of the tee 8 is connected to the air outlet of the fan 1 through a flexible hose. The air inlet side of the fan is equipped with a filter screen 9 and an air volume regulating door 10, which can prevent foreign objects from being sucked in and adjust the air volume.

[0028] In use, start fan 1, adjust the airflow to a suitable level, and the cooling air is blown onto the carbon brushes through the ventilation hole 302 at the bottom of the air duct, simultaneously cooling and removing carbon dust. When replacing the carbon brushes, the suction cup can be removed from the motor body, the entire device can be removed, and after replacement, it can be reattached and fixed. The operation is convenient.

[0029] Example 2 like Figure 6 As shown, for cases where the carbon brush assemblies are arranged on both sides of the motor, only one air duct can be used. The connecting rod is removed, and the air duct is fixed on both sides with fixing rod 5 and hanging rod 6 respectively. The air inlet 301 of the air duct is connected to the tee 8 and the fan 1 through a flexible hose, which also achieves the cleaning and cooling function.

[0030] Example 3 like Figure 7 As shown, the device of the present invention can also be used for cooling motor bearings. By placing the air duct above the bearing and assembling and fixing it in the same manner as in Example 1, targeted ventilation and cooling of the bearing can be achieved.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A carbon brush cleaning and cooling device for an electric machine, characterized in that, Includes a fan, at least one duct, and mounting components; wherein, The air duct is mounted above the motor carbon brush assembly. One end of the air duct is an air inlet, and the other end is closed. Several ventilation holes facing the carbon brush are opened at the bottom of the air duct. The air outlet of the fan is connected to the air inlet to supply cooling air to the air duct; The fixing components are connected to the air duct and the motor body respectively, and are used to detachably fix the air duct to the motor body.

2. The carbon brush cleaning and cooling apparatus of the electric machine according to claim 1, characterized by, The duct is an arc-shaped rigid plastic tube, and its arc shape matches the arrangement shape of the carbon brush assembly.

3. The carbon brush cleaning and cooling apparatus of the electric machine according to claim 1, characterized by, The air duct includes a first air duct and a second air duct arranged in parallel, and the first air duct and the second air duct are fixedly connected by at least one connecting rod.

4. The carbon brush cleaning and cooling apparatus for an electric machine according to claim 3, characterized by, The fixing assembly includes a fixing rod and a hanging rod; the fixing rod includes a first buckle, a first connecting tube, and a first suction cup, the first buckle being used to hold the air duct, and the first suction cup being a magnetic suction cup for adhering to the motor body; the hanging rod includes a second buckle, a second connecting tube, a universal joint, and a second suction cup, the second buckle being used to hold the air duct, the universal joint being used to adjust the angle, and the second suction cup being a magnetic suction cup for adhering to the motor body.

5. The carbon brush cleaning and cooling apparatus for electric machines according to claim 4, characterized in that, Two fixing rods are provided, which are respectively clamped at both ends of the second air duct; one hanging rod is provided, which is clamped at the middle part of the first air duct.

6. The carbon brush cleaning and cooling device for an electric motor according to claim 3, characterized in that, The connecting rod includes two third clips and a third connecting tube connecting the two third clips. The length of the third connecting tube is determined according to the distance between the two sets of carbon brush assemblies.

7. The carbon brush cleaning and cooling device for an electric motor according to claim 4, characterized in that, The connecting pipes of the fixed rod, connecting rod, and hanging rod are all hollow structures.

8. The carbon brush cleaning and cooling device for an electric motor according to claim 4, characterized in that, Both the first and second suction cups are made of magnets and are completely covered with a plastic layer.

9. The carbon brush cleaning and cooling device for an electric motor according to claim 1, characterized in that, The fan is equipped with a filter and an air volume regulating door on the air inlet side. The filter is used to prevent foreign objects from being sucked in, and the air volume regulating door is used to regulate the output air volume of the fan.

10. The carbon brush cleaning and cooling device for an electric motor according to claim 1, characterized in that, The device is also used for cooling the bearings of the motor by installing air ducts above the bearings for ventilation and cooling.

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