A high-voltage direct-current power supply switching device for an electric dust collector

Abstract

The application discloses a high-voltage direct-current power supply switching device for an electric dust collector, which comprises a shell, a lifting driving mechanism, two standby conducting ends, a high-voltage power supply side fixed end, an electric field side fixed end, two grounding fixed ends, a conducting switching plate, a stop switching plate and a standby switching plate. The shell is internally provided with the lifting driving mechanism. The lifting driving mechanism is provided with the conducting switching plate, the stop switching plate and the standby switching plate. The upper end of the shell is provided with the electric field side fixed end and one grounding fixed end. The lower end of the shell is provided with the high-voltage power supply side fixed end and one grounding fixed end. The front and rear ends of the shell are respectively provided with the standby conducting ends. The conducting switching plate, the stop switching plate and the standby switching plate are driven by the lifting driving mechanism to enter the working positions in sequence, and are respectively in the normal conducting state, the stop grounding state and the standby conducting state. Compared with the prior art, the device can save the equipment cost and the installation space, is simple to install, and can realize standby of one standby power supply for all power supplies of the electric dust collector.

Description

[Technical Field]

[0001] This invention relates to the technical field of electrostatic precipitators, and in particular to a high-voltage DC power supply switching device for electrostatic precipitators. [Background Technology]

[0002] A single channel of an electrostatic precipitator typically contains multiple electric fields, and its dust removal efficiency of over 99% is also achieved by the superposition of the dust removal effects of multiple electric fields.

[0003] Existing high-voltage DC power supplies for electrostatic precipitators typically employ a "one-to-one" power supply method, using a high-voltage inlet hood, a high-voltage disconnect switch box, and an insulator chamber to supply power to each electric field of the precipitator separately. When a power supply failure occurs and cannot be easily and quickly repaired, it is necessary to temporarily disassemble, lift, and stack the power supply according to the plant's operating procedures. A backup power supply must then be moved and lifted to its original position for replacement. Power supply to the electric fields can only be restored after completing procedures such as cable connections, network configuration, and parameter settings.

[0004] If each electric field is powered by a "two-to-one" or "many-to-one" method, the high cost is undoubtedly unacceptable. Moreover, the difficulty of arranging power supplies in the small space on top of the dust collector is multiplied. Other difficulties include the lifting of the high-voltage DC power supply and the reinforcement of the inner and outer top covers. [Summary of the Invention]

[0005] The purpose of this invention is to solve the problems in the prior art and to propose a high-voltage DC power supply switching device for electrostatic precipitators, which can save equipment costs and installation space, is easy to install, and can realize the backup of all power supplies of electrostatic precipitators by one backup power supply.

[0006] To achieve the above objectives, this invention proposes a high-voltage DC power supply switching device for an electrostatic precipitator, comprising a housing, a lifting drive mechanism, two standby conducting terminals, a high-voltage power supply side fixed terminal, an electric field side fixed terminal, two grounding fixed terminals, a conduction switching plate, a deactivation switching plate, and a standby switching plate. The housing is equipped with a lifting drive mechanism, which is equipped with the conduction switching plate, the deactivation switching plate, and the standby switching plate. The upper end of the housing is equipped with an electric field side fixed terminal and a grounding fixed terminal, and the lower end of the housing is equipped with a high-voltage power supply side fixed terminal and a grounding fixed terminal. The front and rear ends of the housing are respectively equipped with standby conducting terminals. Under the drive of the lifting drive mechanism, the conduction switching plate, the deactivation switching plate, and the standby switching plate sequentially enter the working position, which are respectively the normal conducting state, the deactivation grounding state, and the standby conducting state.

[0007] Preferably, the conduction switching plate includes a conduction insulating plate, and both the upper and lower ends of the conduction insulating plate are provided with conduction contacts. The conduction insulating plate is provided with a connecting wire for connecting the conduction contacts.

[0008] Preferably, the deactivation switching plate includes a deactivation insulating plate, and two deactivation contacts are provided at both the upper and lower ends of the deactivation insulating plate. Two deactivation wires are provided inside the deactivation insulating plate to connect the two deactivation contacts at the same end.

[0009] Preferably, the backup switching board includes a backup insulating board, with backup contact head I at the front end and the top end of the backup insulating board, and backup contact head II at the rear end and the bottom end of the backup insulating board. The backup insulating board contains two backup wires for connecting the backup contact heads I and connecting the backup contact heads II, respectively.

[0010] Preferably, the lifting drive mechanism includes two sets of drive shafts, one at the front and one at the rear. Each drive shaft is equipped with two sprockets, with the upper sprocket corresponding to the lower sprocket. The two corresponding sprockets are equipped with drive chains. The mechanism also includes a transmission box with two output ends that rotate in opposite directions. One output end of the transmission box is connected to the corresponding drive shaft at the front via a synchronous belt drive mechanism, and the other output end of the transmission box is connected to the corresponding drive shaft at the rear via a synchronous belt drive mechanism. The input end of the transmission box is connected to the drive end of the drive motor.

[0011] Preferably, the upper end of the housing is provided with an observation window.

[0012] Preferably, the conduction switching plate, the deactivation switching plate, and the standby switching plate are all provided with indicator bars of different colors. When the conduction switching plate, the deactivation switching plate, and the standby switching plate are in the working position, the indicator bars on them correspond to the observation window.

[0013] Preferably, the upper and lower ends of the housing are respectively provided with an electric field connection position and a high-voltage power supply connection position.

[0014] Preferably, the upper end of the housing is provided with a positioning sensor, and the on switching plate, the off switching plate and the standby switching plate are all provided with a sensing object that cooperates with the positioning sensor.

[0015] The beneficial effects of this invention are as follows: The upper end of the housing is provided with an electric field side fixed end and a grounding fixed end; the lower end of the housing is provided with a high-voltage power supply side fixed end and a grounding fixed end; and the front and rear ends of the housing are respectively provided with standby conducting ends. Driven by a lifting drive mechanism, the conducting switching plate, the deactivation switching plate, and the standby switching plate sequentially enter the working position, respectively in the normal conducting state, the deactivation grounding state, and the standby conducting state. Compared with existing technologies, this invention saves equipment costs and installation space, is easy to install, and allows one standby power supply to provide backup for all power supplies of the electrostatic precipitator.

[0016] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. [Attached Image Description]

[0017] Figure 1 This is a schematic diagram of the structure of a high-voltage DC power supply switching device for an electrostatic precipitator according to the present invention;

[0018] Figure 2 This is a side view of a high-voltage DC power supply switching device for an electrostatic precipitator according to the present invention;

[0019] Figure 3 This is a schematic diagram of three switching positions of a high-voltage DC power supply switching device for an electrostatic precipitator according to the present invention;

[0020] Figure 4 This is a schematic diagram showing the switching positions of the three electric fields in normal working state;

[0021] Figure 5 This is a schematic diagram of the switching position taking the failure and shutdown of the two electric field power supply as an example;

[0022] Figure 6 This is a schematic diagram showing the switching positions of the three electric fields when they are out of operation.

[0023] In the diagram: 1-Housing, 2-Lifting drive mechanism, 3-Spare conductive end, 4-High voltage power supply side fixed end, 5-Electric field side fixed end, 6-Grounding fixed end, 7-Conduction switching plate, 8-Disuse switching plate, 9-Spare switching plate, 10-Observation window, 11-Indicator bar, 12-Positioning sensor, 13-Sensed object, 14-Electric field connection position, 15-High voltage power supply connection position, 21-Drive shaft, 22-Sprocket, 23-Drive chain, 24-Drive box, 25-Drive motor, 71-Conduction insulation plate, 72-Conduction contact head, 73-Connecting wire, 81-Disuse insulation plate, 82-Disuse contact head, 83-Disuse wire, 91-Spare insulation plate, 92-Spare contact head I, 93-Spare contact head II, 94-Spare wire.

Detailed Implementation Methods

[0024] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6This invention discloses a high-voltage DC power supply switching device for an electrostatic precipitator, comprising a housing 1, a lifting drive mechanism 2, two spare conducting terminals 3, a high-voltage power supply side fixed terminal 4, an electric field side fixed terminal 5, two grounding fixed terminals 6, a conduction switching plate 7, a deactivation switching plate 8, and a spare switching plate 9. The housing 1 is provided with the lifting drive mechanism 2, and the lifting drive mechanism 2 is provided with the conduction switching plate 7, the deactivation switching plate 8, and the spare switching plate 9. The upper end of the housing 1 is provided with the electric field side fixed terminal 5 and a grounding fixed terminal 6, and the lower end of the housing 1 is provided with the high-voltage power supply side fixed terminal 4 and a grounding fixed terminal 6. The front and rear ends of the housing 1 are respectively provided with spare conducting terminals 3. After the conduction switching plate 7, the deactivation switching plate 8, and the spare switching plate 9 are driven by the lifting drive mechanism 2 to enter the working position in sequence, they are respectively in the normal conducting state, the deactivation grounding state, and the spare conducting state.

[0025] The conduction switching plate 7 includes a conduction insulating plate 71, and conduction contacts 72 are provided at both the upper and lower ends of the conduction insulating plate 71. A connecting wire 73 for connecting the conduction contacts 72 is provided inside the conduction insulating plate 71.

[0026] The deactivation switching plate 8 includes a deactivation insulating plate 81. Two deactivation contacts 82 are provided at both the upper and lower ends of the deactivation insulating plate 81. Two deactivation wires 83 are provided inside the deactivation insulating plate 81 to connect the two deactivation contacts 82 at the same end.

[0027] The backup switching board 9 includes a backup insulating board 91. The front end and upper end of the backup insulating board 91 are provided with backup contact heads I92, and the rear end and lower end of the backup insulating board 91 are provided with backup contact heads II93. The backup insulating board 91 contains two backup wires 94, which are used for communication between backup contact heads I92 and between backup contact heads II93, respectively.

[0028] The lifting drive mechanism 2 includes two sets of drive shafts 21, one at the front and one at the rear. Each drive shaft 21 is equipped with two sprockets 22, with the upper sprocket 22 corresponding to the lower sprocket 22. The two corresponding sprockets 22 are equipped with a drive chain 23. The mechanism also includes a transmission box 24 with two output ends and the two output ends rotating in opposite directions. One output end of the transmission box 24 is connected to the corresponding drive shaft 21 at the front via a synchronous belt drive mechanism, and the other output end of the transmission box 24 is connected to the corresponding drive shaft 21 at the rear via a synchronous belt drive mechanism. The input end of the transmission box 24 is connected to the drive end of the drive motor 25.

[0029] The upper end of the housing 1 is provided with an observation window 10.

[0030] The switching plate 7, the deactivation switching plate 8, and the standby switching plate 9 are each equipped with indicator strips 11 of different colors. When the switching plate 7, the deactivation switching plate 8, and the standby switching plate 9 are in the working position, the indicator strips 11 on them correspond to the observation window 10.

[0031] The upper and lower ends of the housing 1 are respectively provided with an electric field connection position 14 and a high voltage power supply connection position 15.

[0032] The upper end of the housing 1 is provided with a positioning sensor 12, and the conduction switching plate 7, the deactivation switching plate 8 and the standby switching plate 9 are all provided with a sensing object 13 that cooperates with the positioning sensor 12.

[0033] Working process of this invention:

[0034] In the operation of this invention, a high-voltage DC power supply switching device for an electrostatic precipitator drives a transmission box 24 via a drive motor 25. The transmission box 24 drives the corresponding transmission shaft 21 to rotate. The transmission shaft 21 drives the corresponding transmission chain 23 to rotate via a sprocket 22. The transmission chain 23 drives the switching plate 7, the deactivated switching plate 8, and the standby switching plate 9 to move, thereby achieving smooth switching between the switching plates between the fixed end 4 on the high-voltage power supply side and the fixed end 5 on the electric field side. When the switching plates are raised or lowered, they can be switched to the three positions shown in the figure, respectively, for normal conduction, deactivated grounding, and standby conduction (more can be added as needed). The switching position can be determined by observing the color of the switching position indicator bar 11 of each switching plate through the observation window 10. With the cooperation of the positioning sensor 12 and the sensed body 13, the system can automatically determine the switching position. In conjunction with the lifting drive mechanism 2, the system can perform fully automatic switching.

[0035] To ensure conductivity, circular grounding plates are used at the connection points between each contact head and the fixed end. The three positions are: Position 1 is the normal conducting state, where each electric field's dedicated power supply powers its corresponding electric field. Position 2 is the deactivated grounding state. Position 3 is the standby conducting state, where the fixed end 5 on the electric field side can receive power from the previous electric field, and the high-voltage power supply fixed end 4 can supply power to the next electric field. The distance between each insulating plate should be ≥250mm.

[0036] When a severe fault occurs in the power supply of a certain electric field (assumed to be electric field two, and so on), the electric field experiences a power outage. At this time, the high-voltage DC power supply switching device for electric field two needs to be switched to the standby conduction state, and electric field two prepares to receive power from the high-voltage DC power supply of electric field one. Next, the switching device for electric field one switches to the standby conduction state, and the high-voltage DC power supply from electric field one supplies power to electric field two, while electric field one prepares to receive power from the standby high-voltage DC power supply. Then, the switching device corresponding to the standby power supply switches to the standby conduction state, and the standby power supply is put into operation. In this way, the standby power supply can be used as a backup for the high-voltage power supplies of all electric fields.

[0037] 1. Easy to install, reducing the difficulty and workload of on-site installation and wiring.

[0038] 2. Easy to operate, greatly shortening the time of electric field power outage in case of power failure, ensuring the emission efficiency of electrostatic precipitator.

[0039] 3. In conventional high-voltage disconnect switch boxes, high-voltage conductors are connected to the switch by bending, relying on the rigidity of the conductors themselves for fixation and to ensure insulation spacing. After prolonged use, this is prone to deformation and even breakage. The insulation board used in this invention employs an integrated circuit design, ensuring robustness, reliability, and a wider range of switching methods. Customized insulation boards can be added upon request to achieve functions such as insulation detection of the electric field and automatic transformer diagnosis.

[0040] 4. The modular design allows for the use of movable insulation plates and fixed terminals, enabling the dual functions of a high-voltage disconnect switch and a backup power supply switching switch, thus saving equipment costs and installation space requirements.

[0041] 5. It has an electric operation function, which increases the overall level of automation. It can perform corresponding backup switching according to the system's automatic diagnostic function, further improving the intelligence level of the electrostatic precipitator system.

[0042] 6. The connection to the fixed end adopts a connecting piece design to ensure reliable connection. Dual positioning ensures accurate insulation layer placement.

[0043] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A high-voltage DC power supply switching device for an electrostatic precipitator, characterized in that: The device includes a housing (1), a lifting drive mechanism (2), two spare conducting terminals (3), a high-voltage power supply side fixed terminal (4), an electric field side fixed terminal (5), two grounding fixed terminals (6), a conduction switching plate (7), a deactivation switching plate (8), and a spare switching plate (9). The housing (1) contains the lifting drive mechanism (2), and the lifting drive mechanism (2) is equipped with the conduction switching plate (7), the deactivation switching plate (8), and the spare switching plate (9). The upper end of the housing (1) is equipped with the electric field side fixed terminal (5) and a grounding fixed terminal (6), and the lower end of the housing (1) is equipped with... The high-voltage power supply side fixed end (4) and a grounding fixed end (6) are provided. The front and rear ends of the housing (1) are respectively provided with spare conduction ends (3). The conduction switching plate (7), the deactivation switching plate (8) and the spare switching plate (9) enter the working position in sequence under the drive of the lifting drive mechanism (2), and are respectively in normal conduction state, deactivation grounding state and spare conduction state. In the normal conduction state, each electric field dedicated power supply is used to supply power to the corresponding electric field. In the spare conduction state, the electric field side fixed end (5) receives the power supply of the previous electric field, and the high-voltage power supply side fixed end (4) supplies power to the next electric field.

2. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The conduction switching plate (7) includes a conduction insulating plate (71), and both the upper and lower ends of the conduction insulating plate (71) are provided with conduction contacts (72). The conduction insulating plate (71) is provided with a connecting wire (73) for connecting the conduction contacts (72).

3. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The deactivation switching plate (8) includes a deactivation insulation plate (81), and two deactivation contacts (82) are provided at both the upper and lower ends of the deactivation insulation plate (81). Two deactivation wires (83) are provided inside the deactivation insulation plate (81) to connect the two deactivation contacts (82) on the same end.

4. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The backup switching board (9) includes a backup insulating board (91). The front end and upper end of the backup insulating board (91) are provided with backup contact head I (92), and the rear end and lower end of the backup insulating board (91) are provided with backup contact head II (93). The backup insulating board (91) contains two backup wires (94) for connecting the backup contact head I (92) and connecting the backup contact head II (93) respectively.

5. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The lifting drive mechanism (2) includes two sets of transmission shafts (21) at the front and rear. Each transmission shaft (21) is provided with two sprockets (22). The upper sprocket (22) corresponds to the lower sprocket (22) one by one. The two corresponding sprockets (22) at the top and bottom are provided with transmission chains (23). It also includes a transmission box (24) with two output ends and the two output ends rotate in opposite directions. One output end of the transmission box (24) is connected to the corresponding transmission shaft (21) at the front through a synchronous belt transmission mechanism. The other output end of the transmission box (24) is connected to the corresponding transmission shaft (21) at the rear through a synchronous belt transmission mechanism. The input end of the transmission box (24) is connected to the drive end of the drive motor (25).

6. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The upper end of the housing (1) is provided with an observation window (10).

7. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 6, characterized in that: The switching plate (7), the deactivation switching plate (8), and the standby switching plate (9) are each equipped with indicator strips (11) of different colors. When the switching plate (7), the deactivation switching plate (8), and the standby switching plate (9) are in the working position, the indicator strips (11) on them correspond to the observation window (10).

8. The high-voltage DC power supply switching device for an electrostatic precipitator as described in claim 1, characterized in that: The upper and lower ends of the housing (1) are respectively provided with an electric field connection position (14) and a high voltage power supply connection position (15).

9. A high-voltage DC power supply switching device for an electrostatic precipitator as described in any one of claims 1 to 8, characterized in that: The upper end of the housing (1) is provided with a positioning sensor (12), and the conduction switching plate (7), the deactivation switching plate (8) and the standby switching plate (9) are all provided with a sensing body (13) that cooperates with the positioning sensor (12).

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