Grounding brush structure with electrostatic monitoring function

Abstract

The utility model relates to a grounding electric brush structure with static monitoring, which belongs to the technical field of grounding devices and comprises a casing seat, a grounding wire II communicated with the ground is arranged at the lower end of the casing seat, a casing cover connected with the casing seat is arranged at the upper end of the casing seat, a rotating shaft is arranged between the casing cover and the casing seat, and the rotating shaft is connected with the casing seat. A grounding electric brush which extends to the rotating shaft and is in contact connection with the rotating shaft is arranged on the machine shell cover, a grounding resistor is arranged on the outer side of the machine shell base, and grounding wires I which are in circuit communication with the grounding wire II are arranged between the grounding resistor and the grounding electric brush and between the grounding resistor and the machine shell base. The device has the characteristics of compact structure, good operation stability and good effect. The grounding function protects the rotating shaft from being damaged by static electricity, the static electricity monitoring function prejudges whether static electricity accumulation of the unit tends to be serious or not through trend analysis, an alarm is given in advance before damage occurs, and the unit is protected from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of grounding device technology, and specifically to a grounding brush structure with electrostatic monitoring. Background Technology

[0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work. The turbine rotor rotates and performs work under the support of bearings. Due to the inherent mechanical and electrical characteristics of rotating machinery, an induced voltage is generated on the rotor during rotation. If this induced voltage is not handled, it will find an alternative path to be conducted to the ground. This alternative path is typically through the rotor's bearings or seals. When these components become grounding conductors for the induced voltage, an induced current is generated, which can damage the metal surface.

[0003] If induced current is not discharged in time, bearings, seals, and rotor surfaces will gradually be damaged, the rotor's dynamic characteristics will slowly change, and eventually the rotor will fail, resulting in costly repairs. Using a grounding brush to release the induced voltage in a timely manner can help prevent such problems.

[0004] The dry steam in the low-pressure cylinder of the steam turbine rubs against the turbine blades, generating electrostatic charge, which charges the rotor and produces shaft voltage. A two-point grounding short circuit or an inter-turn short circuit in the rotor windings generates an axial unbalanced magnetic flux, which magnetizes the rotor axially, generating a self-excited monopole potential at the journal and impeller, thus producing shaft voltage.

[0005] Normally, the shaft voltage does not exceed a few volts or a dozen volts. However, when the insulating pad fails due to oil stains, damage, or aging, the shaft voltage is sufficient to break down the oil film between the shaft and the bearing, causing a discharge. Over time, this will gradually deteriorate the quality of the lubricating and cooling oil, and in severe cases, it will burn out the shaft and bearing, causing a shutdown accident. Summary of the Invention

[0006] This invention primarily addresses the shortcomings of existing technologies by providing a grounding brush structure with electrostatic monitoring. This structure is characterized by its compact design, high operational stability, and excellent performance. The grounding function protects the rotating shaft from electrostatic damage, while the electrostatic monitoring function uses trend analysis to predict whether the static electricity accumulation in the unit is becoming severe, issuing an early warning before damage occurs and protecting the unit from harm.

[0007] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0008] A grounding brush structure with electrostatic monitoring includes a housing base, a grounding wire II connected to the ground at the lower end of the housing base, a housing cover connected to the housing base at the upper end of the housing base, a rotating shaft between the housing cover and the housing base, a grounding brush extending to and contacting the rotating shaft on the housing cover, a grounding resistor on the outside of the housing base, and a grounding wire I connected to the grounding wire II in a phase circuit between the grounding resistor and the grounding brush, and between the grounding resistor and the housing base.

[0009] Preferably, an electrostatic monitoring instrument connected in parallel with the grounding resistor is provided on both sides of the grounding resistor, and a signal cable connected to the grounding wire I phase circuit is provided between the grounding resistor and the electrostatic monitoring instrument.

[0010] Preferably, the electrostatic monitoring instrument includes an electrostatic monitoring housing, a display screen that is snap-fitted into the end face of the electrostatic monitoring housing, and several buttons that are snap-fitted into the side of the display screen.

[0011] Preferably, the electrostatic monitoring housing is equipped with a circuit control board that is connected to the display screen and buttons, and a signal transmitter connected to the circuit control board is provided on the side of the circuit control board.

[0012] Preferably, the electrostatic monitoring housing is equipped with a cooling fan at its upper end.

[0013] Preferably, a wiring connector is provided between the grounding wire I and the housing base.

[0014] Preferably, the grounding brush is provided with a brush head mounting plate that is bolted to and fixed to the end face of the housing cover.

[0015] This invention can achieve the following effects:

[0016] This invention provides a grounding brush structure with electrostatic monitoring, which, compared with existing technologies, features a compact structure, good operational stability, and superior performance. The grounding function protects the rotating shaft from electrostatic damage, while the electrostatic monitoring function uses trend analysis to predict whether the static electricity accumulation in the unit is becoming severe, issuing an early warning before damage occurs and protecting the unit from harm. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a front view structural diagram of the electrostatic monitoring instrument in this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the electrostatic monitoring system in this utility model.

[0020] In the diagram: 1. Housing cover; 2. Brush head mounting plate; 3. Grounding brush; 4. Grounding wire I; 5. Signal cable; 6. Static electricity monitor; 7. Cooling fan; 8. Grounding resistor; 9. Wiring connector; 10. Shaft; 11. Housing base; 12. Grounding wire II; 13. Static electricity monitoring housing; 14. Display screen; 15. Button; 16. Circuit control board; 17. Signal transmitter. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: Figure 1 , Figure 2 and Figure 3 As shown, a grounding brush structure with electrostatic monitoring includes a housing base 11. A grounding wire II 12, connected to the ground, is located at the lower end of the housing base 11. A housing cover 1, connected to the housing base 11, is located at the upper end of the housing base 11. A rotating shaft 10 is located between the housing cover 1 and the housing base 11. A grounding brush 3, extending to and contacting the rotating shaft 10, is located on the housing cover 1. A brush head mounting plate 2, bolted to the end face of the housing cover 1, is located on the grounding brush 3. A grounding resistor 8 is located on the outside of the housing base 11. A grounding wire I 4, connected to the grounding wire II 12, is located between the grounding resistor 8 and the grounding brush 3, and between the grounding resistor 8 and the housing base 11. A wiring connector 9 is located between the grounding wire I 4 and the housing base 11. Electrostatic monitoring instruments 6, connected in parallel with the grounding resistor 8, are located on both sides of the grounding resistor 8. A signal cable 5, connected to the grounding wire I 4, is located between the grounding resistor 8 and the electrostatic monitoring instruments 6. Static electricity on the rotating shaft 10 reaches the grounding resistor 8 through the grounding wire I4. The static electricity monitor 6 is connected in parallel on both sides of the grounding resistor 8. Then, the grounding wire I4 is connected to the housing base 11 and grounded through the grounding wire II12.

[0023] The electrostatic discharge monitor 6 includes an electrostatic discharge monitoring housing 13, with a cooling fan 7 at its upper end. A display screen 14 is attached to the end face of the electrostatic discharge monitoring housing 13 in a snap-fit ​​configuration. Several buttons 15 are attached to the side of the display screen 14 in a snap-fit ​​configuration. Inside the electrostatic discharge monitoring housing 13 is a circuit control board 16 that is electrically connected to the display screen 14 and the buttons 15. A signal transmitter 17, also electrically connected to the circuit control board 16, is located on the side of the circuit control board 16.

[0024] In summary, this grounding brush structure with electrostatic monitoring features a compact design, good operational stability, and excellent performance. It ensures that the grounding function protects the shaft from electrostatic damage, while the electrostatic monitoring function uses trend analysis to predict whether the static electricity accumulation in the unit is becoming severe, issuing an early warning before damage occurs and protecting the unit from harm.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A ground brush structure with static electricity monitoring, characterized by: Including the chassis seat (11), the chassis seat (11) lower end is equipped with the ground wire II (12) that communicates with ground, the chassis seat (11) upper end is equipped with the machine shell cover (1) connected with the chassis seat (11), the machine shell cover (1) and the chassis seat (11) between the pivot (10) is equipped with, the machine shell cover (1) is equipped with the ground brush (3) that extends to the pivot (10) and with the pivot (10) contact, the chassis seat (11) outside is equipped with the grounding resistance (8), the grounding resistance (8) and the ground brush (3) between, the grounding resistance (8) and the chassis seat (11) between the ground wire I (4) is equipped with the circuit communication with ground wire II (12).

2. The static monitored ground brush structure of claim 1, wherein: The grounding resistance (8) both sides are equipped with the electrostatic monitor (6) parallelly connected with the grounding resistance (8), the grounding resistance (8) both sides and the electrostatic monitor (6) between the signal cable line (5) is equipped with the circuit communication with ground wire I (4).

3. The static monitored ground brush structure of claim 2, wherein: The electrostatic monitor (6) includes electrostatic monitoring shell (13), the electrostatic monitoring shell (13) end face is equipped with the display screen (14) with the electrostatic monitoring shell (13) card embedded type plug-in, the display screen (14) side is equipped with a plurality of button (15) with the electrostatic monitoring shell (13) card embedded type plug-in.

4. The static monitored ground brush structure of claim 3, wherein: The electrostatic monitoring shell (13) is equipped with the circuit control board (16) with the display screen (14), button (15) circuit communication, the circuit control board (16) side is equipped with the signal transmitter (17) with the circuit control board (16) circuit communication.

5. The static monitored ground brush structure of claim 3, wherein: The electrostatic monitoring shell (13) upper end is equipped with the cooling fan (7).

6. The static monitored ground brush structure of claim 1, wherein: The ground wire I (4) and the chassis seat (11) between the wiring plug connector (9) are equipped with.

7. The electrostatically monitored ground brush structure of claim 1, wherein: The ground brush (3) is equipped with the brush head mounting plate (2) with the machine shell cover (1) end face bolted connection fixed.

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