JPH0638929B2 - Electric dust collector power supply - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrostatic precipitator, and more particularly to a power supply device for an electrostatic precipitator having an improved intermittent charging rate setting method applied to the power supply device. Is.

[Conventional technology]

Conventionally, in an electrostatic precipitator that controls a power adjusting element such as a thyristor by an intermittent charging signal to intermittently generate a high DC voltage from a commercial power source, an intermittent high DC voltage (hereinafter, this is referred to as an intermittent charging rate). The setting) is performed by a setting circuit. This intermittent charge rate is, for example, charge rate = 1/1, 2/3, 1/2, 1/3, 1/4, 1
/ 5, 1/10, 1/15, 1/20, 1/30, which is preset, and is installed in the field such as a power supply device control panel for the electrostatic precipitator (hereinafter simply referred to as a control panel) The charge rate setter attached to the has a relay corresponding to each charge rate, and the thyristor is controlled so that the charge rate corresponds to the excited relay, and intermittent high DC voltage is generated. It is a mechanism to do. The charge rate setting device is configured so that it can be selected by a setting switch installed in a place distant from this, for example, in a central operating room.

An actual intermittent charge rate setting circuit for performing such an intermittent charge rate setting operation is conventionally configured as shown in FIG.

That is, the intermittent charging rate setting circuit is configured such that the setting operation unit for setting the intermittent charging rate is installed at a distant place and can be set remotely. The setting operation unit has a setting switch 2 corresponding to each charge rate, which is the same as the charge rate setting apparatus attached to the control panel (power supply device control panel for electrostatic precipitator) 1 installed in the field or the like, and is located in the center in the distance. A cable 4 is installed on a general operation panel (hereinafter, simply referred to as an operation panel) 3 installed in an operation room or the like, and a cable 4 corresponding to each setting switch 2 is laid between both panels and this cable is installed. 4 is connected to the coil of the relay 5 corresponding to each charge rate of the charge rate setting device attached to the control panel 1, whereby the setting switch 2 is selectively turned on and is excited. The thyristor is controlled so as to have the charging rate of the relay 5 corresponding to 2 and thereby the intermittent high DC voltage is generated. Therefore, when the setting switch 2 of the operation panel 3 is turned on, the coil of the relay 5 corresponding thereto is excited, and a desired contact signal is obtained.

[Problems to be solved by the invention]

The conventional intermittent charging rate remote setting method as described above has the following problems.

That is, in general, when attempting to classify a series of intermittent charge rates, control is performed over about 9 to 11 signal lines including 8 to 10 types of charge rates including a common line, and tens to hundreds of meters. Since it is necessary to connect between the panel 1 and the operation panel 3, there is a drawback that the cost becomes high in terms of materials and construction. Further, since a long signal line may induce noise in the outside world, the relay 5 of the control panel 1 once converts it into a contact signal to eliminate the influence of noise as described above. Are required for the number corresponding to the type of charge rate (8 to 10), which leads to an increase in cost and a decrease in reliability.

In view of the above, the present invention aims to reduce the number of relays and cables while maintaining noise immunity from the outside in the intermittent charging rate remote setting circuit, thereby reducing cost and improving reliability. Is.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention controls a power adjusting element to a charging rate according to a charging rate setting signal that determines an intermittent charging rate sent from a distant place, and intermittently applies a high DC voltage from a commercial power source. As a setting circuit for setting the intermittent charge rate in the power supply device of the electrostatic precipitator that generates a charge rate setting signal, a binary code is used as the charge rate setting signal, and when a binary code charge rate setting signal is input, a corresponding code is received. A conversion means for determining and outputting the charge rate is provided and configured, and the output of the conversion means is used to control the power adjustment element.

[Operation] In such a configuration, a binary code is used for the charge rate setting signal sent from a distance. Then, on the power supply unit side of the electrostatic precipitator, this binary code is determined by the conversion means and the charge rate corresponding to this code is determined and output. Then, the power adjusting element is controlled to have this charge rate.

Since the charge rate setting signal is binary coded as described above, the number of bits constituting the signal can be small even if there are many kinds of charge rate that can be set. Therefore, the transmission of the charge rate setting signal sent from a distant place is possible. The number of cables for use can be significantly reduced. Therefore, even if relays are used as an intermediary, the number of relays is small, and the equipment cost can be significantly reduced as compared with the conventional one. Further, since the cost increase due to the use of the relay can be suppressed and the relay can be used easily, the noise resistance can be maintained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a charge rate remote monitoring setting circuit according to the present invention. In the figure, reference numeral 1 is a control panel, and 2'is a setting switch for selecting the charging rate, and its configuration is shown in FIG. Reference numeral 3 is an operation panel, 4 is a cable, 5a and 5b are relays provided on the control panel 1 side, and 6 is a decoder provided on the control panel 1 side.

The setting switch 2'has four contacts a to d, and one terminal of each contact a to d is connected to the power source on the control panel 1 side via the cable 4. In addition, the relay 5a,
5b inputs the contact signal to the decoder 6, and the decoder 6 outputs to the 16 output terminals T0 to T15 in a combination as shown in FIG. 2 (b) according to the combination of the four contact signals. To occur. Here, of these, T0 to T
Utilizes the output of 10 output terminals up to 19. The terminal T0 has a charge rate of 1/1, and the terminal T1 has a charge rate of 2
/ 3, the terminal T2 has a charge rate of 1/2, the terminal T3 has a charge rate of 1/3, and the terminal T4 has a charge rate of 1/4.
, The terminal T5 has a charging rate of 1/5, and the terminal T6 has a charging rate of 1/5.
1/10, terminal T7 corresponds to charging rate = 1/15, terminal T8 corresponds to charging rate = 1/20, and terminal T9 corresponds to charging rate = 1/30. Is at a logic level "L", its corresponding charge rate is set.

The setting switch 2'is, as shown in FIG.
Depending on the state of the four contacts of ~ d, the charge rates 1/1, ~ 1
It corresponds to / 30. That is, the charge rate is converted into a binary code to correspond to it. The setting switch 2'is installed on the remote control panel 3.

The setting switch 2'selectively turns on / off the contacts a to d as shown in FIG. 2 (a) according to the value of the intermittent charging rate to be set, and is turned on among the contacts a to d. The coils of the relays 5a, 5d corresponding to the contacts are excited.

Next, the operation of the present apparatus having the above configuration will be described.

This device operates the setting switch 2'to selectively turn on / off the contacts a to d as shown in FIG. 2 (a) according to the value of the intermittent charging rate to be set. Then, among the contacts a to d, the coils of the relays 5a and 5d corresponding to the turned-on contacts are excited. As a result, the excited relay 5a,
~ 5d contact signal is the corresponding input terminal A of the decoder 6 ~
The data is input to D, and the decoder 6 performs the above-mentioned decoding according to this input, and an output is generated from the output terminal corresponding to the set charge rate.

Now, it is assumed that the setting switch 2'is switched and set on the remote operation panel 3 and the charging rate = 1/3 is selected. 2 (a), in this case, the contacts a and b are turned on and c and d are turned off, so that the relays 5a to 5d of the control panel 1 are excited, excited, non-excited and non-excited from above. The top two contacts are turned on. When the input of the decoder 6 is at the logical level "H" when the corresponding one of the contacts of the relays 5a to 5d is on, and the input of the decoder 6 is at the logical level "L" , Assuming that terminal is selected,
After all, according to FIG. 2B, the output terminal T3 of the decoder 6,
That is, the charge rate = 1/3 is selected, and the intermittent charge rate of the control panel 1 can be selected by the setting switch 2'of the remote control panel 3.

In this way, the binary code obtained by the setting switch 2'of the operation panel 3 is transmitted to the decoder 6, and finally, in accordance with the contents of FIG. home,
Only the one selected by the setting switch 2'of the operation panel 3 is selected, and the remote setting of the intermittent charging rate is realized.

If a microcomputer or the like is used for the control unit of the control panel 1, the binary code output of the setting switch 2'of the operation panel 3, that is, the contact output of the relay 5 of the control panel 1 is used as it is. Since the input / output port can be input to the decoder 6, the decoder 6 becomes unnecessary. Further, when the type of the intermittent charge rate is 8 series, the binary code obtained by the setting switch 2'can be expressed by 3 bits, so the cable 4 passing between the operation panel 3 and the control panel 1 is shown in FIG. Than that of
The number of relays can be reduced to four, and the number of relays 5 can be set to three, which is less than one, to set eight kinds of charging rates at a distance.

As described above, according to the present invention, various kinds of charge rates are associated with binary codes, the binary codes are transmitted through a relay, a signal is transmitted, the decoder decodes the signals, and an output is generated at a corresponding charge rate terminal. It is something that is done. Therefore, in the distant setting circuit of the intermittent charging rate, it is possible to cut off the noise from the outside by the relay of the control panel and maintain the sufficient noise resistance while reducing the points of the relay and the cable. In particular, since the charge rate setting value is binary coded, the number of signal lines can be significantly reduced, and it is possible to reduce the number of signal relays required for each electrostatic precipitator power source to 8 relays.
If you need 10 relays, you need 4 relays. Also, the number of cables required for the conventional 9 cables is four, and the number of cables for 11 is five. Therefore, improvement in reliability and cost reduction can be expected by the reduction.

Also, the number of relays and cables can be reduced in proportion to the required number of power supply devices for electrostatic precipitators.
Greater benefits can be expected.

〔The invention's effect〕

According to the present invention described in detail above, in the remote setting circuit for the intermittent charging rate, the relay of the control panel cuts off noise from the outside, and while maintaining sufficient noise resistance, it is possible to reduce the number of relays and cables. Therefore, it is possible to improve reliability and reduce cost.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of a main part showing a configuration of the present invention, and FIG. 2 is a diagram showing correspondence between ON / OFF combinations of setting switches used in the present apparatus and charging rate setting, and correspondence of input / output of a decoder,
FIG. 3 is a circuit diagram for explaining a conventional example. 1 ... Electric dust collector power supply device control panel, 2 '... Setting switch, 3 ... General operation panel, 4 ... Cable, 5a, to 5
d ... relay, 6 ... decoder.

Claims (1)

[Claims] 1. An electric power collector for generating a DC high voltage intermittently from a commercial power source by controlling a power adjusting element to a charge rate according to a charge rate setting signal for determining an intermittent charge rate sent from a distance. As a setting circuit for setting the intermittent charging rate in the power supply device of the dust container, a binary code is used as the charging rate setting signal, and when the charging rate setting signal of the binary code is input, the charging rate according to the code is determined. A power supply device for an electrostatic precipitator, characterized in that it is configured by providing a converting means for outputting the electric power, and controlling the power adjusting element using the output of the converting means.