Generator carbon brush capable of avoiding carbon brush sparks and generator excitation equipment monitoring device

Abstract

The invention relates to a generator carbon brush and generator excitation equipment monitoring device capable of avoiding carbon brush sparks, which comprises a carbon brush head and a collecting ring, and further comprises a carbon brush support, the inner wall of the carbon brush support is connected with a spring assembly, and the spring assembly comprises a cylinder fixedly connected with the front end of the inner wall of the carbon brush support. A push rod is slidably clamped to the inner wall of the barrel, first springs sleeve the outer wall of the barrel and the outer wall of the push rod, a square plate is fixedly connected to the tail end face of the push rod, one end of each first spring is fixedly connected with the surface of the square plate, and the carbon brush head is fixedly connected to the surface of the other side of the square plate; a control assembly is arranged on the side wall of the carbon brush support, the control assembly is used for preventing the carbon brush head from severely colliding with the collector ring after bouncing and causing spark generation, and the problem that the whole carbon brush is bounced off from the collector ring and collides with the collector ring, and then large spark is generated can be solved. And meanwhile, the current of each carbon brush and the temperature information of the brush holder and the collector ring can be collected in real time.

Description

Technical Field

[0001] The invention relates to a generator carbon brush for avoiding carbon brush sparks and a generator excitation equipment monitoring device, belonging to the technical field of generators. Background Art

[0002] During the long-term operation of large generator sets, the excitation carbon brush current will be unbalanced, causing individual carbon brushes to heat up. Due to the negative temperature characteristics of the carbon brushes, if not handled in time, the heating will become more and more serious, directly leading to the burning of the carbon brushes and even causing ring fire accidents. At present, the monitoring of carbon brushes generally adopts manual regular inspections and other methods, which not only wastes a lot of manpower and material resources and is inefficient, but also fails to detect the signs of accidents in time, bringing hidden dangers to safe production.

[0003] Chinese patent CN117254643A discloses a generator excitation brush holder system, which is connected to a current sensor through wiring, and a temperature sensor is arranged on the inner side of two connecting side plates I; the temperature and current of the carbon brush can be monitored, and an alarm is issued when current imbalance or temperature exceeds the limit, so that maintenance personnel can go to the site in time to deal with it and avoid related accidents; but the following problems still exist:

[0004] The carbon brushes commonly used in generators at present are generally an integral carbon brush head with a square or round shape. After working, such carbon brushes are prone to varying degrees of wear at the contact end of the carbon brush head and the collector ring due to factors such as vibrations generated during work or slight deviations of the motor shaft during installation. Such wear can easily lead to poor contact between the carbon brush and the collector ring, resulting in sparks at the contact point between the carbon brush and the collector ring. In addition, since the interior of the generator is not completely sealed, dust or other garbage particles are easy to enter during operation. When these dust appear on the collector ring, if the carbon brush passes over the dust, it is easy to cause the carbon brush as a whole to be bounced off the collector ring, and collide with the collector ring when resetting. This collision will also generate very large sparks, causing irreversible damage to the collector ring and the carbon brush. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a monitoring device for generator carbon brushes and generator excitation equipment for avoiding carbon brush sparks, which can prevent the carbon brush as a whole from being bounced off the collector ring and colliding with the collector ring, thereby generating large sparks. At the same time, the current of each carbon brush and the temperature information of the brush holder and the collector ring can be collected in real time.

[0006] The technical solution of the present invention is as follows:

[0007] A generator carbon brush for avoiding carbon brush sparks, comprising a carbon brush head and a collector ring, and also comprising a carbon brush holder, the inner wall of the carbon brush holder being connected to a spring assembly, the spring assembly comprising a cylinder fixedly connected to the front end of the inner wall of the carbon brush holder, the inner wall of the cylinder being slidably clamped with a push rod, the outer walls of the cylinder and the push rod are both sleeved with a first spring, the end surface of the push rod is fixedly connected to a square plate, one end of the first spring is fixedly connected to the surface of the square plate, and the carbon brush head is fixedly connected to the other side surface of the square plate; a control assembly is provided on the side wall of the carbon brush holder, and the control assembly is used to avoid the carbon brush head from seriously colliding with the collector ring after it bounces up, thereby causing sparks.

[0008] Among them, the inner wall of the carbon brush bracket is provided with an upper chamber, and the control component includes a winding disk rotatably arranged on the side wall of the upper chamber, the winding disk is connected to a tensioning rope, and the end of the tensioning rope is connected to the top of the square plate; a torsion spring is connected between the winding disk and the side wall of the upper chamber.

[0009] Among them, the inner side wall of the carbon brush bracket is also provided with a lower chamber, and the upper chamber and the lower chamber are connected by a connecting channel; the control component also includes a locking shaft fixedly arranged at the lower part of the lower chamber, and sliding spaces are arranged on the two side walls of the lower chamber and above the locking shaft, and the side walls of the sliding space are provided with sliding rails, and sliding blocks are slidably connected to the sliding rails, and a sliding shaft is rotatably connected between the two sliding blocks, and one end of the tensioning rope wound on the winding disk extends into the lower chamber from the connecting channel, and the tensioning rope is S-shaped from the bottom of the locking shaft to bypass the sliding shaft and extend to the top of the square plate, and a support structure for providing upward elastic force is provided below the sliding space, and when the tension at the end of the tensioning rope is greater than the maximum elastic force of the support structure, the sliding shaft presses down the locking shaft and clamps the tensioning rope to stop it.

[0010] Wherein, the supporting structure includes a plurality of second springs arranged between the bottom of the sliding block and the bottom wall of the sliding space.

[0011] Among them, a receiving groove is opened at the bottom of the sliding space, and a sliding rod is fixedly provided at the bottom of the sliding block to slide and engage with the receiving groove. One end of the second spring is located inside the receiving groove, and the other end of the second spring is fixedly connected to the bottom of the sliding rod.

[0012] Wherein, the inner wall of the carbon brush bracket is in contact with the outer wall of the carbon brush head.

[0013] Wherein, a temperature sensor is installed at the bottom of the carbon brush bracket.

[0014] A generator excitation equipment monitoring device, comprising a generator carbon brush for avoiding carbon brush sparks as described in any one of claims 1-7, and also comprising two mounting plates, a rotor shaft is rotatably connected between the two mounting plates, the collector ring is installed on the rotor shaft, a plurality of the generator carbon brushes are installed between the two mounting plates, and the inner ends of a plurality of the generator carbon brushes are in contact with the collector ring; the generator carbon brush is connected to a current sensor via wiring.

[0015] Wherein, the current sensor is a Hall current sensor.

[0016] Wherein, a dust sensor is also arranged on the installation plate, and a plurality of carbon slag outlet holes are arranged on the installation plate.

[0017] The present invention has the following beneficial effects:

[0018] The present invention provides a spring assembly, and can keep the carbon brush head in contact with the collector ring over a larger length during operation by the pressure of the first spring, thereby reducing the generation of sparks; and when dust or other garbage particles enter, and dust appears on the collector ring, causing the carbon brush head to be bounced off the collector ring as a whole, the present invention can maintain the bounced carbon brush head stable by providing a control assembly, thereby preventing it from falling and colliding with the collector ring to cause sparks;

[0019] The present invention also monitors the temperature and current of the carbon brush head by providing a temperature sensor and a current sensor, timely responds to the temperature and current of the carbon brush head, and issues an alarm when current imbalance or temperature exceeds the limit. Maintenance personnel can go to the site in time to handle it and avoid related accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A half-section diagram of the structure of a generator carbon brush for avoiding carbon brush sparks according to the present invention;

[0021] Figure 2 A schematic diagram of the structure of a control assembly for a generator carbon brush for avoiding carbon brush sparks according to the present invention;

[0022] Figure 3 A half-section diagram of the structure of the generator excitation equipment monitoring device of the present invention;

[0023] Figure 4 It is a side half-section view of the carbon brush holder of the present invention.

[0024] The reference numerals in the figure are as follows:

[0025] 1. Carbon brush head; 2. Carbon brush bracket; 3. Collector ring; 4. Square plate; 7. Control assembly; 8. Mounting plate; 9. Rotor shaft; 201. Upper chamber; 202. Lower chamber; 501. Cylinder; 502. Push rod; 503. First spring; 701. Winding disk; 702. Tension rope; 703. Locking shaft; 704. Slide rail; 705. Sliding block; 706. Sliding shaft; 707. Second spring; 708. Receiving groove; 709. Sliding rod; 10. Thermally deformed metal. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 4 , the invention provides a technical solution:

[0028] A carbon brush for a generator for avoiding carbon brush sparks, comprising a carbon brush head 1 and a collector ring 3, and also comprising a carbon brush bracket 2, wherein the inner wall of the carbon brush bracket 2 is connected with a spring assembly, and the spring assembly comprises a cylinder 501 fixedly connected with the front end of the inner wall of the carbon brush bracket 2, and a push rod 502 is slidably clamped on the inner wall of the cylinder 501, and the outer walls of the cylinder 501 and the push rod 502 are sleeved with a first spring 503, and the end surface of the push rod 502 is fixedly connected with a square plate 4, one end of the first spring 503 is fixedly connected with the surface of the square plate 4, and the carbon brush head 1 is fixedly connected to the other side surface of the square plate 4; a control assembly 7 is arranged on the side wall of the carbon brush bracket 2, and the control assembly 7 is used to avoid the carbon brush head 1 from seriously colliding with the collector ring 3 after it bounces up, resulting in the generation of sparks; a temperature sensor is installed at the bottom of the carbon brush bracket 2, and the temperature sensor is a dot matrix infrared temperature sensor;

[0029] Specifically, an upper chamber 201 is provided on the inner side wall of the carbon brush holder 2, and the control assembly 7 includes a winding disk 701 rotatably arranged on the side wall of the upper chamber 201, and a tension rope 702 is connected to the winding disk 701, and the end of the tension rope 702 is connected to the top of the square plate 4; a torsion spring is connected between the winding disk 701 and the side wall of the upper chamber 201; during normal use, the rear of the carbon brush head 1 will be worn due to long-term contact with the collector ring 3. At this time, the first spring 503 uses its own elastic force to move the square plate 4 toward the collector ring 3, and the moving square plate 4 drives the carbon brush head 1 to move, so that the carbon brush head 1 continues to fit with the collector ring 3 to reduce the generation of sparks. At the same time, the pulling The tightening rope 702 is always in a taut state; when dust or other garbage particles enter, when these dust appear on the collector ring 3, if the carbon brush head 1 passes over the dust, it is easy to cause the carbon brush head 1 to be bounced off the collector ring 3 as a whole. At this time, the carbon brush head 1 bounces up and compresses the first spring 503. At the same time, due to the bounce of the carbon brush head 1, the tightening rope 702 connected to the square plate 4 will be in a relaxed state; then, due to the action of the torsion spring, the winding disk 701 will be driven to rotate in the opposite direction, thereby contracting the tightening rope 702, so that the carbon brush head 1 will not fall at a high speed, thereby causing a serious collision with the collector ring 3 and generating sparks;

[0030] When the temperature of the carbon brush head 1 is at a high state, even if the falling speed of the carbon brush head 1 is reduced, there is still a problem of sparks due to the continuous rotation of the collector ring 3; therefore, as a preferred embodiment, the inner wall of the carbon brush bracket 2 is also provided with a lower chamber 202, and the upper chamber 201 and the lower chamber 202 are connected by a connecting channel; the control component 7 also includes a locking shaft 703 fixedly arranged at the lower part of the lower chamber 202, and sliding spaces are provided on both side walls of the lower chamber 202 and above the locking shaft 703, and slide rails 704 are provided on the side walls of the sliding space. A sliding block 705 is slidably connected to the slide rail 704, and a sliding shaft 706 is rotatably connected between the two sliding blocks 705. One end of the tension rope 702 wound on the winding disk 701 extends from the connecting channel into the lower chamber 202, and the tension rope 702 is S-shaped from the bottom of the locking shaft 703 around the sliding shaft 706 and extends to the top of the square plate 4. A support structure for providing an upward elastic force is provided below the sliding space. When the tension at the end of the tension rope 702 is greater than the maximum elastic force of the support structure, the sliding shaft 706 presses down the locking shaft 703 and clamps the tension rope 702 to stop it.

[0031] The supporting structure includes a plurality of second springs 707 arranged between the bottom of the sliding block 705 and the bottom wall of the sliding space. A receiving groove 708 is provided at the bottom of the sliding space. A sliding rod 709 is fixedly provided at the bottom of the sliding block 705 and is slidably engaged with the receiving groove 708. One end of the second spring 707 is located inside the receiving groove 708, and the other end of the second spring 707 is fixedly connected to the bottom of the sliding rod 709.

[0032] Specifically, after the carbon brush head 1 is bounced off the collector ring 3 as a whole, the torsion spring will drive the winding disk 701 to rotate in the opposite direction, thereby contracting the tension rope 702. The first spring 503 will continue to press the carbon brush head 1 toward the collector ring 3. At this time, since the tension rope 702 contracts for a certain distance, the length of the tension rope 702 pulled out is shorter than the length when the tension rope 702 is not bounced out. Therefore, when the tension rope 702 continues to move toward the collector ring 3 following the carbon brush head 1, the elastic force provided by the first spring 503 is used to tighten the tension rope 702. 702 will be dragged, so that the tension rope 702 is subjected to downward pressure, and the tension rope 702 wound on the sliding shaft 706 will pull the sliding shaft 706 downward, and because the elastic force brought by the first spring 503 is greater than the elastic force of the second spring 707, the sliding shaft 706 will be pressed against the locking shaft 703 and the tension rope 702 will not be released. Since the tightened tension rope 702 cannot be extended, the carbon brush head 1 cannot contact the collector ring 3 as before, and there will be no risk of sparks, etc. The collector ring 3 stops running and can be reset manually.

[0033] As a preferred embodiment, Figure 4 As shown, it also includes a thermally deformable metal 10, and a through groove is opened at the corresponding position on the carbon brush bracket 2 and the sliding block 705. The thermally deformable metal 10 crosses the corresponding through grooves on the carbon brush bracket 2 and the sliding block 705 at room temperature. The thermally deformable metal 10 can be deformed by winding a heating component such as an electric heating wire, and the heating component is started by a temperature sensor; or when the temperature rises, the required thermally deformable metal 10, such as a copper sheet, is selected according to the temperature change; when the temperature is low, the thermally deformable metal 10 crosses the carbon brush bracket 2 and the sliding block 705 In the corresponding through groove on the upper surface, the sliding block 705 will not drive the sliding shaft 706 to press the locking shaft 703. The carbon brush head 1 will only bounce up and then drop at a slower speed, resulting in a slight collision with the collector ring 3, avoiding the generation of sparks. When the temperature is high, the heat-deformed metal 10 will deform and retract into the through groove of the carbon brush holder 2. At this time, the carbon brush holder 2 and the sliding block 705 are not restricted, so that the sliding shaft 706 will be pressed against the locking shaft 703 and the tensioning rope 702 will not be released. Any structure that can achieve the above method can also be used.

[0034] The inner wall of the carbon brush holder 2 fits the outer wall of the carbon brush head 1 .

[0035] A monitoring device for generator excitation equipment, comprising a generator carbon brush for avoiding carbon brush sparks according to the embodiment of any one of claims 1 to 7, and further comprising two mounting plates 8, a rotor shaft 9 being rotatably connected between the two mounting plates 8, a collector ring 3 being mounted on the rotor shaft 9, a plurality of generator carbon brushes being mounted between the two mounting plates 8, and the inner ends of the plurality of generator carbon brushes being in contact with the collector ring 3; the generator carbon brushes being connected to a current sensor through wiring, the current sensor being a Hall current sensor; a temperature sensor monitoring the temperature of the carbon brush head 1, a current sensor monitoring the current on the carbon brush head 1, the temperature sensor and the current sensor being connected to an external control center, the temperature sensor and the current sensor being connected to an external display, the display being used to display the temperature of the temperature sensor and the current of the current sensor, thereby monitoring the temperature and current of the carbon head 1, timely responding to the temperature and current of the carbon brush head 1, and giving an alarm when current imbalance or temperature exceeding the limit occurs, so that maintenance personnel can go to the site in time for processing to avoid the occurrence of related accidents.

[0036] A dust sensor is also provided on the mounting plate 8 , and a plurality of carbon slag outlet holes are provided on the mounting plate 8 .

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A carbon brush for a generator for avoiding carbon brush sparks, comprising a carbon brush head (1) and a collector ring (3), characterized in that: It also includes a carbon brush holder (2), the inner wall of which is connected to a spring assembly, the spring assembly comprising a cylinder (501) fixedly connected to the front end of the inner wall of the carbon brush holder (2), the inner wall of the cylinder (501) is slidably engaged with a push rod (502), the outer walls of the cylinder (501) and the push rod (502) are both sleeved with a first spring (503), the end surface of the push rod (502) is fixedly connected to a square plate (4), one end of the first spring (503) is fixedly connected to the surface of the square plate (4), and the carbon brush head (1) is fixedly connected to the other side surface of the square plate (4); the side wall of the carbon brush holder (2) is provided with a control assembly (7), and the control assembly (7) is used to prevent the carbon brush head (1) from seriously colliding with the collector ring (3) after it bounces up, thereby preventing the generation of sparks.

2. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 1, characterized in that: An upper chamber (201) is provided on the inner side wall of the carbon brush holder (2); the control component (7) comprises a winding disk (701) rotatably arranged on the side wall of the upper chamber (201); a tension rope (702) is connected to the winding disk (701); an end of the tension rope (702) is connected to the top of the square plate (4); and a torsion spring is connected between the winding disk (701) and the side wall of the upper chamber (201).

3. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 2, characterized in that: The inner side wall of the carbon brush holder (2) is also provided with a lower chamber (202), and the upper chamber (201) and the lower chamber (202) are connected via a connecting channel; the control component (7) also includes a locking shaft (703) fixedly arranged at the lower part of the lower chamber (202), and sliding spaces are arranged on both side walls of the lower chamber (202) and above the locking shaft (703), and the side walls of the sliding space are provided with sliding rails (704), and the sliding rails (704) are slidably connected to sliding blocks (705), and the two sliding blocks (705) A sliding shaft (706) is rotatably connected therebetween, one end of a tensioning rope (702) wound around the winding disk (701) extends from the connecting passage into the lower chamber (202), and the tensioning rope (702) is S-shaped from the bottom of the locking shaft (703) around the sliding shaft (706) and extends to the top of the square plate (4), and a support structure for providing an upward elastic force is provided below the sliding space, and when the tension at the end of the tensioning rope (702) is greater than the maximum elastic force of the support structure, the sliding shaft (706) presses down the locking shaft (703) and clamps the tensioning rope (702) to stop it.

4. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 3, characterized in that: The supporting structure comprises a plurality of second springs (707) arranged between the bottom of the sliding block (705) and the bottom wall of the sliding space.

5. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 4, characterized in that: A receiving groove (708) is provided at the bottom of the sliding space, a sliding rod (709) is fixedly provided at the bottom of the sliding block (705) and is slidably engaged with the receiving groove (708), one end of the second spring (707) is located inside the receiving groove (708), and the other end of the second spring (707) is fixedly connected to the bottom of the sliding rod (709).

6. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 1, characterized in that: The inner wall of the carbon brush bracket (2) fits the outer wall of the carbon brush head (1).

7. A generator carbon brush for avoiding carbon brush sparks as claimed in claim 1, characterized in that: A temperature sensor is installed at the bottom of the carbon brush bracket (2).

8. A generator excitation equipment monitoring device, characterized in that: A generator carbon brush for avoiding carbon brush sparks as described in any one of claims 1 to 7, further comprising two mounting plates (8), a rotor shaft (9) being rotatably connected between the two mounting plates (8), the collector ring (3) being mounted on the rotor shaft (9), a plurality of the generator carbon brushes being mounted between the two mounting plates (8), the inner ends of a plurality of the generator carbon brushes being in contact with the collector ring (3); and the generator carbon brush being connected to a current sensor via wiring.

9. A generator excitation equipment monitoring device as claimed in claim 8, characterized in that: The current sensor is a Hall current sensor.

10. A generator excitation equipment monitoring device according to claim 9, characterized in that: A dust sensor is also provided on the mounting plate (8), and a plurality of carbon slag outlet holes are provided on the mounting plate (8).

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