JP7412404B2 - High pressure generation tank section, power supply device, electrostatic precipitator, and manufacturing method of power supply device - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies November 1, 2021 Published in Origin Technical Journal No. 84, pages 1-16

The present disclosure relates to a power supply device that supplies high voltage power.

2. Description of the Related Art High-voltage power supplies are used in electrostatic precipitators that clean flue gas and the like (see, for example, Patent Document 1). In a high-voltage power supply, the circuit that generates high voltage is housed in a tank filled with insulating oil, and an insulator is used to extract the power generated inside the tank to the outside of the tank.

Conventionally, the inside of an insulator was filled with insulating oil only up to the level of the insulating oil in the tank. In the case of an insulator installed vertically at the top of a tank to prevent oil leakage, the presence of air inside the insulator can cause the generation of flammable gas due to corona discharge near the conductor passing through the center of the insulator. There were cases where this happened.

Capacitor bushings are used to prevent the generation of flammable gases. The capacitor bushing has a sealed structure on both the top and bottom surfaces of the insulator, and the inside is filled with insulating oil. Since the capacitor bushing has a sealed structure, an air layer was required at the head of the insulator to absorb the expansion of the insulating oil. For this reason, when a capacitor bushing is used, the insulator itself becomes larger, which causes an increase in cost.

Japanese Patent Application Publication No. 2003-088132

An object of the present disclosure is to make it possible to fill the area around a conductor inside an insulator with insulating oil in a compact and inexpensive manner.

The present disclosure relates to a high pressure generation tank section included in a power supply device,
A circuit that converts the voltage of an input signal to a high voltage,
a tank accommodating the circuit;
a lid placed on the top of the tank and sealing the tank;
an insulator connected to the circuit with a conductor and guiding the high voltage generated in the circuit to the outside of the tank;
insulating oil poured into the tank to a level higher than the bottom surface of the insulator and filled around the conductor provided in the insulator;
Equipped with

Furthermore, the method for manufacturing a power supply device according to the present disclosure includes:
A circuit that converts voltage is housed in the tank of the power supply,
Connecting the circuit to an insulator conductor,
sealing the tank with a lid;
evacuate the inside of the tank,
Thereafter, insulating oil is poured into the tank until the oil level of the insulating oil becomes higher than the bottom surface of the insulator, and the area around the conductor provided in the insulator is filled with insulating oil.

According to the present disclosure, it is possible to fill the periphery of the conductor inside the insulator with insulating oil in a small size and at low cost, so that the high voltage tank section of the high voltage power supply device can be downsized at low cost.

An example of a power supply device according to this embodiment is shown. An example of the configuration of the high pressure generation tank section of this embodiment is shown. An example of the manufacturing process of the power supply device according to the present embodiment is shown. An example of the manufacturing process of the power supply device according to the present embodiment is shown. An example of the manufacturing process of the power supply device according to the present embodiment is shown. An example of the planar structure of the high pressure generation tank section of this embodiment is shown. An example of a circuit accommodated in the tank of this embodiment is shown.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented with various changes and improvements based on the knowledge of those skilled in the art. Note that components with the same reference numerals in this specification and the drawings indicate the same components.

FIG. 1 shows an example of a power supply device according to this embodiment. The power supply device according to this embodiment includes a high-pressure generation tank section 120 that generates high voltage, and a control section 110 that controls the voltage generated by the high-pressure generation tank section 120. The high pressure generation tank section 120 includes a circuit 24 that generates high voltage, a tank 21 that accommodates the circuit 24, and an insulator 23 that takes out the generated power.

The control unit 110 and the tank 21 are connected by a power line 26. The tank 21 is equipped with an input terminal 25 to which an output signal from the control section 110 is input. The circuit 24 generates a high voltage based on the output signal input from the input terminal 25.

The power supply device according to this embodiment can employ any configuration capable of generating a high voltage as shown in FIG. 7. 1 is a rectifier that generates a DC voltage, 2 and 3 are choke coils and a capacitor that constitute a low frequency filter 4, 5 is an inverter that generates an AC current by driving pulses of a predetermined frequency, and 24 is a high frequency This is a circuit that converts the high frequency output voltage from the inverter 5 into a DC high voltage. The circuit 24 includes, for example, a resonant inductor 12, a high voltage transformer 9, capacitors 13 and 14, a high voltage rectifier (rectifier circuit (full wave rectifier diode) 10, and resistors R2 and R3. An example will be shown in which the voltage supplied to the electrode 11 is controlled according to the detected voltage VS.

The power supply device according to this embodiment generates a voltage difference corresponding to a rectified voltage between the discharge electrode 11 and the grounded dust collection electrode 12. The electrostatic precipitator collects dust between the discharge electrode 11 and the dust collection electrode 12 by causing discharge between the discharge electrode 11 and the dust collection electrode 12 . The voltage difference used in the electrostatic precipitator is arbitrary, and can be, for example, -45 kV to -180 kV.

As shown in FIG. 1, the insulator 23 includes a conductor 31 at the center for outputting the high voltage generated in the circuit 24. The conductor 31 passes through the insulator 23, and a gap 32 is arranged along the conductor 31. If air is present in this gap 32, corona discharge may occur.

FIG. 2 shows an example of the configuration of the high pressure generation tank section of this embodiment. The upper part of the tank 21 of this embodiment is sealed with a lid 22, and the entire gap 32 is filled with insulating oil 27. The insulator 23 passes through the lid 22. The input terminal 25 is arranged on the side surface of the tank 21.

In the method for manufacturing a power supply device of the present disclosure, when manufacturing the high-pressure tank section 120,
A circuit 24 is housed in the tank 21 (FIG. 3),
Connect the circuit 24 to the conductor 31 of the insulator 23 (Fig. 3),
The tank 21 is sealed with a lid 22 (Fig. 3),
Make the inside of the tank 21 a vacuum (Figure 3),
Thereafter, insulating oil 27 is filled into the tank 21 (FIGS. 4 and 5). In the present disclosure, since the bottom surface portion 23B of the insulator 23 is not made into a sealed structure, the air in the gap 32 flows out to the outside and disappears, and the insulating oil 27 flows in instead.
In this manner, the present disclosure fills the gaps 32 of the insulator 23 with the insulating oil 27 by vacuum filling the insulating oil 27 in the tank 21 .

Here, in the present disclosure, when lubricating, as shown in FIG. . Therefore, since no air exists in the gap 32 of the insulator 23 and it is filled with the insulating oil 27, it is possible to prevent corona discharge from occurring within the insulator 23. In addition, the volume expansion due to temperature change of the insulating oil 27 inside the insulator 23 is absorbed by the air layer 28 at the top of the tank 21, so there is no need to provide an air layer in the head 23T of the insulator 23. 23 can also be made smaller.

Further, in the present disclosure, a space 28 is left between the lid 22 of the tank 21 and the oil surface 27S of the insulating oil 27 during oil filling. Thereby, it is possible to cope with increases and decreases in the insulating oil 27 inside the tank 21 body and the insulator 23 due to temperature changes.

FIG. 6 shows an example of the planar structure of the tank 21 of the present disclosure. The tank 21 of the present disclosure has an octagonal cross-sectional shape in the height direction. Since the tank 21 has an octagonal shape, the amount of insulating oil 27 used inside the tank 21 can be reduced.

Further, a high voltage output line 41 from the conductor 31 is protected by a duct 42. The duct 42 is attached so that the longitudinal direction of the duct 42 coincides with the direction perpendicular to the side surface of the tank 21. Although the figure shows an example in which the output line 41 and the duct 42 are connected in three directions, they may be connected in one direction or two directions.

As described above, the power supply device of the present disclosure can fill the gap 32 inside the insulator 23 with the insulating oil 27 without using a capacitor bushing, so the high pressure generation tank section 120 can be miniaturized at low cost. Can be done. Therefore, the present disclosure can provide a small power supply device in which the periphery of the conductor 31 inside the insulator 12 is filled with the insulating oil 27 at a low cost.

The present disclosure can be applied to any device that uses a high voltage power supply, such as an electrostatic precipitator.

1: Rectifier 2: Choke coil 3: Capacitor 4: Low frequency filter 5: Inverter 5A to 5D: Insulated gate bipolar transistor 6A to 6D: Antiparallel diode 9: High voltage transformer 10: Rectifier circuit 11, 12: Electrode 13, 14: Capacitor 21: Tank 22: Lid 23: Insulator 24: Circuit 25: Input terminal 26: Power line 27: Insulating oil 31: Conductor 32: Gap 41: Output line 42: Duct 110: Control section 120: High pressure generation tank section

Claims (5)

A high pressure generation tank part provided in the power supply device,
A circuit that converts the voltage of an input signal to a high voltage,
a tank accommodating the circuit;
a lid placed on the top of the tank and sealing the tank;
an insulator connected to the circuit with a conductor and guiding the high voltage generated in the circuit to the outside of the tank;
insulating oil poured into the tank to a level higher than the bottom surface of the insulator and filled around the conductor provided in the insulator;
High pressure generation tank section equipped with. The tank has an octagonal cross-sectional shape perpendicular to the height direction of the tank.
The high pressure generation tank section according to claim 1. The high pressure generation tank section according to claim 1 or 2,
a control unit that controls the voltage generated in the high pressure generation tank unit;
A power supply device comprising: comprising the power supply device according to claim 3;
collecting dust by discharging the high voltage generated by the power supply device;
Electrostatic precipitator. A circuit that converts voltage is housed in the tank of the power supply,
connecting the circuit to an insulator conductor;
sealing the tank with a lid;
evacuate the inside of the tank,
After that, insulating oil is poured into the tank until the oil level of the insulating oil becomes higher than the bottom surface of the insulator, and the insulating oil is filled around the conductor provided in the insulator.
A method of manufacturing a power supply device.

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