External mounting type large shaft electrostatic grounding device of air compressor unit

Abstract

The utility model relates to the technical field of static grounding of an air compressor unit, in particular to an external mounting type large shaft static grounding device of the air compressor unit, which comprises an arc support hung on a large shaft, a first flower basket type carbon brush holder is arranged at one end of the arc support, and a second flower basket type carbon brush holder is arranged at the other end of the arc support. The first flower basket type carbon brush holder and the second flower basket type carbon brush holder are respectively fixed on a bearing box shell of the air compressor through a U-shaped support, carbon brushes attached to the surface of the large shaft are arranged in the first flower basket type carbon brush holder and the second flower basket type carbon brush holder, and outgoing lines of the carbon brushes are connected with one end of a grounding wire. And the other end of the grounding wire is connected to the ground body. The device is used for shunting the shaft current, so that the abrasion of the original electrostatic grounding brush head is reduced; meanwhile, the device can replace the carbon brush on line, realizes safe and reliable static elimination of equipment, and prolongs the service life of a bearing bush of an air compressor unit.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic grounding of air compressor units, in particular to an external large-axis electrostatic grounding device for an air compressor unit. Background Art

[0002] When using a steam turbine, a large number of wet steam particles collide with each other, becoming frictionally charged. The static electricity effect of the accumulated charge generated by the friction between the high-speed jet of steam and the turbine blades, as well as impurities in the steam, will all generate shaft voltage on the equipment.

[0003] The residual magnetism formed during the rotor processing and manufacturing, magnetic particle inspection, and the eddy current device installed on the bearing may make the equipment destructive. If the demagnetization is not thorough, or new acid is formed and a magnetic field is established due to friction, collision, and scaling of magnetic materials during operation, the rotating magnetic field cutting the conductor will induce a certain potential in the rotor.

[0004] Due to the existence of shaft voltage and potential, the voltage can break through the oil film at both ends of the rotor during operation to generate shaft current and burn the bearings. The original equipment installed a special electrostatic grounding device on the bearing box between the steam turbine system and the air compression system. The base was fixed on the bearing box shell, and the electrostatic grounding brush head was overlapped on the shaft through the brush arm. The static electricity was conducted to the earth through the grounding wire, but there were the following defects:

[0005] (1) The original electrostatic grounding device cannot be replaced and maintained online. When the air compressor unit is running, if the grounding brush head is severely worn, because the original electrostatic grounding device is fixed on the bearing box, opening the base of the grounding device to replace the brush head will inevitably destroy the vacuum degree of the system and cause the device to jump.

[0006] (2) The maintenance cost is extremely high. Since the air compressor unit was put into use, the imported electrostatic grounding brush heads have been worn out and replaced 14 times, each costing nearly 30,000 yuan. The maintenance cost of the brush heads alone is 420,000 yuan. The price of an original electrostatic grounding device is nearly 300,000 yuan (brush arm + brush head), which is expensive and has extremely high maintenance costs. Utility Model Content

[0007] The utility model aims to provide an external large shaft electrostatic grounding device for an air compressor unit.

[0008] The utility model provides the following technical solutions:

[0009] An external main shaft electrostatic grounding device for an air compressor unit comprises an arc bracket suspended on the main shaft, a first basket-shaped carbon brush holder is arranged at one end of the arc bracket, and a second basket-shaped carbon brush holder is arranged at the other end, the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are each fixed to the bearing box shell of the air compressor through a U-shaped bracket, and the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are both provided with carbon brushes attached to the surface of the main shaft, the lead wire of the carbon brush is connected to one end of the grounding wire, and the other end of the grounding wire is connected to the ground body.

[0010] Furthermore, limiting sliding grooves are provided on both sides of the U-shaped bracket.

[0011] Furthermore, the arc bracket is a copper-clad steel arc bracket.

[0012] Furthermore, the fixed slots on both sides of the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are provided with spring pieces for squeezing the carbon brushes and allowing the carbon brushes to adhere to the surface of the large shaft.

[0013] Furthermore, the U-shaped bracket is formed by overlapping and welding two angle steel bottoms together.

[0014] Compared with the prior art, the utility model has the following beneficial effects: in actual application, while retaining the original electrostatic grounding device, a set of the electrostatic device of the utility model is installed on the exposed large shaft between the steam turbine system and the air compression system to shunt the shaft current, which can reduce the wear of the original electrostatic grounding brush head; at the same time, the electrostatic grounding device of the utility model can replace the carbon brush online, so as to realize the safe and reliable elimination of static electricity of the equipment, improve the service life of the bearing of the air compressor unit, and ensure the stable operation of the production equipment; in addition, the carbon brush of the utility model has low cost and can greatly reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the practical application structure of the utility model.

[0016] Figure 2 Schematic diagram of the U-shaped bracket structure.

[0017] In the figure, 000-original electrostatic grounding device; 1-main shaft; 2-arc bracket; 3-first basket-shaped carbon brush holder; 4-second basket-shaped carbon brush holder; 5-U-shaped bracket; 51-limiting slide groove; 6-bearing box housing; 8-carbon brush; 10-ground wire; 11-ground body; 12-spring. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] In the present embodiment, the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are both 25*32 basket-shaped carbon brush holders, and the carbon brushes are D172 carbon brushes.

[0020] An external main shaft electrostatic grounding device for an air compressor unit comprises an arc bracket 2 suspended on the main shaft 1, a first basket-shaped carbon brush holder 3 is arranged at one end of the arc bracket 2, and a second basket-shaped carbon brush holder 4 is arranged at the other end, the first basket-shaped carbon brush holder 3 and the second basket-shaped carbon brush holder 4 are respectively fixed to a bearing box housing 6 of the air compressor through a U-shaped bracket 5, and a carbon brush 8 attached to the surface of the main shaft 7 is arranged in the first basket-shaped carbon brush holder 3 and the second basket-shaped carbon brush holder 4, the lead wire of the carbon brush 8 is connected to one end of a ground wire 10, and the other end of the ground wire 10 is connected to a ground body 11; the carbon brush 8 is arranged above the main shaft 1, and the lead wire of the carbon brush 8 is connected to the ground body 11 through the ground wire 10 to realize the shunting of the shaft current, which can reduce the wear of the original electrostatic grounding brush head; the arc bracket 2 is used to locate the span between the carbon brushes 8 in the two basket-shaped carbon brush holders.

[0021] Both sides of the U-shaped bracket 5 are provided with limited slots 51, so as to facilitate fixing one side of the U-shaped bracket 5 to the bearing box housing 6 with bolts, and fixing the other side of the U-shaped bracket 5 to the basket-shaped carbon brush holder with bolts.

[0022] The arc bracket 2 is a copper-clad steel arc bracket with high conductivity.

[0023] The fixed slots on both sides of the first basket-shaped carbon brush holder 3 and the second basket-shaped carbon brush holder 4 are provided with spring pieces 12 for squeezing the carbon brush 8 and allowing the carbon brush 8 to adhere to the surface of the main shaft 1; one end of the spring piece 12 is fixed in the fixed slots on both sides of the carbon brush holder, and the other end squeezes the carbon brush 8 downward to maintain a certain pressure on the carbon brush 8 so that the carbon brush 8 is in good contact with the main shaft 1.

[0024] The U-shaped bracket 5 is formed by overlapping and welding two angle steel bottoms.

[0025] In practical applications, one side of the U-shaped bracket 5 is fixed by bolts to fix the device on the bearing box housing 6. The squeezing of the spring 12 ensures that the carbon brush 8 is in good contact with the main shaft 1. The lead wire of the carbon brush is connected to the ground body 11 through the ground wire 10 to realize the shunting of the shaft current.

[0026] The implementation modes of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An external large shaft electrostatic grounding device for an air compressor unit, characterized in that: It includes an arc bracket suspended on the main shaft, a first basket-shaped carbon brush holder is arranged at one end of the arc bracket, and a second basket-shaped carbon brush holder is arranged at the other end, the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are respectively fixed to the bearing box shell of the air compressor through a U-shaped bracket, and the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are both provided with carbon brushes attached to the surface of the main shaft, the lead wire of the carbon brush is connected to one end of the grounding wire, and the other end of the grounding wire is connected to the ground body.

2. The external large shaft electrostatic grounding device of an air compressor unit according to claim 1 is characterized in that: Both sides of the U-shaped bracket are provided with limiting sliding grooves.

3. The external large shaft electrostatic grounding device of an air compressor unit according to claim 1 is characterized in that: The arc bracket is a copper-clad steel arc bracket.

4. The external large shaft electrostatic grounding device of an air compressor unit according to claim 1 is characterized in that: The fixed slots on both sides of the first basket-shaped carbon brush holder and the second basket-shaped carbon brush holder are both provided with spring pieces for squeezing the carbon brushes and allowing the carbon brushes to adhere to the surface of the large shaft.

5. The external large shaft electrostatic grounding device of an air compressor unit according to claim 1 is characterized in that: The U-shaped bracket is formed by overlapping and welding two angle steel bottoms.

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