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High voltage power supply unit for electric dust collector

A high-voltage power supply and dust collector technology, applied in power supply technology, electrostatic separation, etc., can solve the problems of reduced dust collection efficiency, failure to consider the fire safety of dust collection objects, and inability to ensure the suspension time, so as to prevent the generation of discharge sparks, The effect of suppressing the generation of continuous sparks and ensuring ignition safety

Active Publication Date: 2019-03-29
MIDORI ANZEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) According to the electrode state of the discharge and the state of the discharge space, it is determined whether it is an occasional single spark or a stable continuous spark, and the discharge spark itself cannot be controlled on the power supply side
[0005] (3) In addition, as phenomena other than the above, abnormalities caused by overcurrent or continuous voltage drop of low-resistance loads caused by insulation deterioration such as moisture without accompanying discharge sparks also occur.
In this case, the ability to collect dust cannot be expected, so it is necessary to quickly perform measures such as electrode cleaning, and also need to make a judgment as quickly as possible, but there is no mechanism for distinguishing it from discharge sparks.
[0006] (4) In the case of insulation degradation caused by moisture, it will be restored if the electrode cleaning is performed, but dust collection will be suspended during this period
[0009] (1) The technical idea of ​​the control necessary for the discharge spark countermeasure is not realized by software programming, but is all processed by analog circuits, so the circuit becomes complicated, a large number of parts is required, cost, and changes in the specifications itself Change requires parts replacement with troublesome work
[0010] (2) As the voltage value or current value as the control target value, point-like control is basically considered, and the necessity of function control with a two-dimensional distribution is not recognized
[0011] (3) Prioritize not causing a reduction in dust collection efficiency and restore the voltage as quickly as possible from the temporary voltage drop associated with the discharge spark. Therefore, the fire safety of the dust collection object is not considered at all.
Therefore, sufficient suspension time cannot be ensured
Therefore, this still creates the problem of fire safety

Method used

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  • High voltage power supply unit for electric dust collector
  • High voltage power supply unit for electric dust collector
  • High voltage power supply unit for electric dust collector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example ＞

[0054] This example is control aimed at ensuring safety by stopping time. Specifically, as figure 2 As shown, when a spark is generated, the load is momentarily short-circuited, and a voltage drop A caused by the spark occurs. As a result, the output voltage V becomes substantially zero. The drop of the output voltage V causes the spark detection B to be performed by the voltage detection circuit 3, and the start C mode is stopped. As a result, the discharge was temporarily suspended, but due to the suspension, the high-voltage power supply device for an electric dust collector released from the load short-circuit recovers. If the cause of the discharge spark is not removed, it is easy to switch to a continuous discharge spark. However, even if a discharge spark occurs, if it occurs once, it will not threaten safety, and there is no need to stop the operation. Therefore, in order not to switch to continuous discharge, even if it occurs once, the spark should be detected im...

no. 2 example ＞

[0058] The purpose of this example is spark suppression in constant current mode. When the generation of the discharge spark does not end in the process described in the first embodiment, the output characteristic of the power supply is switched in order to suppress the generation of the discharge spark and continue the operation of the dust collector.

[0059] image 3 It is a graph showing an example of constant current / constant voltage operation, that is, box-type constant voltage / constant current output characteristics, in which initial discharge characteristics E and post-operation discharge characteristics F are superimposed. Initially, the operation starts from operating point G, but due to contamination of electrodes, etc., in order to continue constant current / constant voltage operation, it switches to operating point H, and gradually reduces the output current I through the intersection of constant current characteristics and constant voltage characteristics, thereby...

no. 3 example ＞

[0074] In the above-mentioned second embodiment, the manner of gradually reducing the current of the constant current / constant current control has been described, but the same method can also be described in detail in the spark suppression in the constant voltage mode. That is, if Figure 4 As shown, it is also possible to reduce the constant voltage characteristic M to the constant voltage characteristic N without changing the constant current characteristic, and further decrease from the constant voltage characteristic N to the constant voltage characteristic O stepwise.

[0075] In spite of the processing of Example 1, if the number of discharge sparks generated within a certain period exceeds a predetermined threshold, the discharge sparks can be reliably stopped by changing the value of the constant voltage on the software, but the discharge current value The range of change is relatively large, therefore, compared with the second embodiment, it is inferior in terms of en...

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Abstract

　A high-voltage power source device for an electric dust collector in which an output voltage V and an output current I outputted to an ionizer I and a collector II are detected, and an output voltage signal S1 representing the output voltage V and an output current signal S2 representing the output current I are supplied to a CPU 9, whereby the CPU 9 performs duty control for PWM control using a conversion device, wherein: the CPU 9 acquires the output voltage signal S1 or the output current signal S2 and immediately ceases output of the output voltage V by minimizing the duty of the PWM control when a discharge spark caused by a decrease in the output voltage V is detected; and after a prescribed cessation time elapses, the CPU 9 performs a control so that the voltage increase speed of the output voltage V is set to a moderately increasing curve that is set on the basis of the split ratio of the duty and the sampling speed at which the output voltage signal S1 or the output current signal S2 is acquired.

Description

technical field [0001] The present invention relates to a high-voltage power supply device for an electric dust collector, and particularly relates to a device useful for controlling voltage / current supplied to an ionizer or a collector as a load by PWM duty ratio control. Background technique [0002] When the electric dust collector is operated continuously for a long time, due to the dust / mist / carbon / cutting oil / water droplets accumulated on the electrodes, sparks may be generated between the electrodes and dust collection may be hindered. In the case of continuous discharge sparks, not only the dust collection efficiency is reduced, but also the possibility of oil fire hazard is generated, so the measures for power interruption / dust collection suspension should be carried out as quickly as possible, but in this case, there are also Questions like the following. [0003] (1) At present, when a discharge spark is caused between the electrodes, stop for 10 seconds and star...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C3/68
CPCB03C3/68
Inventor 山下隆之杉田直记
Owner MIDORI ANZEN
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