CN203235565U - Electrostatic oily fume purification device with independently adjustable load - Google Patents

Abstract

The utility model discloses an electrostatic oily fume purification device with an independently adjustable load. The electrostatic oily fume purification device consists of a shell, an air inlet, an air outlet, a high-voltage electrostatic region and a high-voltage power supply box, wherein the high-voltage electrostatic region consists of a plurality of groups of positive electrodes and negative electrodes; each group of electrodes are connected in series with a resistor and then are connected to high-voltage output of the high-voltage power supply box; the resistor can be a rheostat and a light emitting diode (LED) indicating lamp connected in series with the rheostat in the positive direction. By the structure, the electric field intensity error caused by different distances of the groups of positive and negative electrodes is compensated to a certain extent; the electrostatic oily fume purification device can normally work in a larger power supply voltage fluctuation range; the whole purification efficiency is improved; the load characteristic is improved, so that a high-voltage power supply is difficultly damaged, and the reliability of equipment is improved.

Description

An electrostatic oil fume purification device with independently adjustable load

technical field

The utility model relates to an oil fume purification device, in particular to an electrostatic oil fume purification device with independently adjustable load.

Background technique

The electrostatic oil fume purification device relies on DC high voltage to generate an electrostatic field to polarize and charge the oil particles passing through the air, tear the polarized oil particles apart, and divide them into positively and negatively charged particle clusters. Under the action of Coulomb force, it is driven to the plate to achieve the purpose of collection and purification.

The field strength of the electrostatic field depends on the magnitude of the DC voltage. When the voltage is insufficient, the energy of the electrostatic field is small. Although the oil particles are still polarized when they pass through the electrostatic area, positive and negative charges will be induced on the surface, but the oil particle cluster cannot be opened. After the oil particles leave the electric field, they will return to the original state, and the electrostatic purification is ineffective. When the voltage is too high, the energy of the electrostatic field is too large, and the dielectric between the plates will be broken down to generate discharge. During the discharge, the voltage drops sharply, and electrostatic purification cannot be carried out.

The conventional high-voltage electrostatic area, no matter what kind of electrode structure is used, is composed of several groups of positive electrodes and negative electrodes, which are connected in parallel and supplied by a high-voltage power supply box.

Since there are technological differences in the spacing and shape between the positive and negative electrodes of each group, and they will not change once they are installed, so their electric field strengths are different under the unified parallel power supply. This situation produces the following disadvantages:

1. It is difficult to adjust the high-voltage output of the high-voltage power supply box to take into account the needs of electrodes with different spacing. When the working voltage satisfies the electric field strength of a group of electrodes with a small spacing to make the purification effect good, a group of electrodes with a large spacing cannot reach the required electric field strength, and the electrostatic purification effect is poor; on the contrary, a group of electrodes with a large spacing When the optimum electric field strength is reached, a group of electrodes with a small spacing is in an excessively large electric field strength, resulting in a discharge arc. In fact, in order to avoid discharge, many electrode groups work under the condition of insufficient electric field strength, which reduces the overall purification efficiency of the equipment. The above situation also exists when the power supply fluctuates and causes the high voltage to change.

2. The conventional high-voltage power supply adopts constant current control, which is a practical function to automatically correct the decrease in electric field strength caused by the oil pollution gradually accumulated during the operation of the equipment. But it also brings a problem. If the loads of each group of electrodes are different due to the different spacing, the small spacing will grab the current, and the large spacing will not get the current, resulting in uneven working current of each group of electrodes and low purification efficiency of the equipment.

3. Once the high voltage or medium changes cause a certain group of electrodes to generate arcing and the voltage drops sharply, not only the other groups connected in parallel cannot work normally, but also may cause the power to be concentrated in this group and released. In the case of poor power protection Next, bury the fire hazard.

4. The high-voltage power supply box adopts frequency conversion boost power supply, and the circuit is protected against overcurrent, overload, and arcing. Current and voltage feedback signals are used to control the switch tube. The overload capacity of semiconductor power devices is very low due to the damage mechanism, even if the protection design is perfect and reliable. The reliability is still not high, and in the occasions where the power supply voltage is unstable, damage to the power box occurs from time to time.

Contents of the invention

The purpose of this utility model is to design and provide an electrostatic oil fume purification device with independent and adjustable load, which can improve the above problems, make the electric field strength between each group of electrodes in the high-voltage electrostatic area approach to balance, weaken the discharge arc, and improve Reliability of high voltage power supply.

The purpose of this utility model is achieved through the following technical solutions: an electrostatic oil fume purification device with independently adjustable load, which is composed of a housing, an air inlet, an air outlet, a high-voltage electrostatic area and a high-voltage power supply box; the high-voltage electrostatic The area is composed of several groups of positive electrodes and negative electrodes, and each group of electrodes is connected in series with the high voltage output of the high voltage power supply box. The resistor may be a rheostat and an LED indicator connected in forward series with it.

In the conventional electrostatic lampblack purifier, for the load of the high-voltage power supply, each set of positive and negative electrodes is a nonlinear load, and its current is not proportional to the voltage. When the voltage is too high, a discharge arc is generated between the positive and negative electrodes, the current changes suddenly, increases sharply, and the voltage drops. It affects the work of other groups of positive and negative electrodes connected in parallel. In severe cases, it may cause damage to the semiconductor switching power devices of the high-voltage power supply.

After each group of positive and negative electrodes are connected in series with resistors, they can adjust the current within a certain range to improve the overall purification efficiency of the high-voltage static area. At the same time, due to the current limiting effect of the resistors, the phenomenon of discharge arcing is limited. Since the resistor is connected in series with the non-linear load, the load characteristics are changed, and it is also a good protection for the high-voltage power supply.

Resistors can be connected in series on positive or negative poles, depending on the specific process. Connect LED indicators in series in the forward direction of the resistor circuit, and you can roughly observe the working conditions of the group.

In the case of higher energy efficiency requirements, the resistor can be replaced by an electronic rheostat, which is not difficult to realize in the field of electronics technology, because the correct design only requires it to withstand a small part of the high voltage.

Beneficial effect

With the above structure, the electric field strength error caused by the different spacing of the positive and negative electrodes of each group can be compensated to a certain extent, and it can work normally within a large fluctuation range of the power supply voltage, and the overall purification efficiency can be improved; due to the improved load characteristics, The high-voltage power supply is not easily damaged, which improves the reliability of the equipment.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the electrical principle diagram of the high-voltage electrostatic zone described in the utility model. Figure 2 is a schematic diagram of the physical structure of the high-voltage static area.

In Figure 1, A1~A9 are the positive electrode plates in the high-voltage electrostatic area; B1~B8 are the negative electrode plates in the high-voltage electrostatic area; R1~R8 are the corresponding resistors connected in series in the positive and negative electrode group circuits; LED1~LED8 are Corresponding LED indicators.

In Fig. 2, 1 is a support plate; 2 is a positive pole support rod; 3 is a positive pole electrode plate; 4 is a negative pole support pole; 5 is a low-voltage insulating part; 6 is a high-voltage insulating part;

Detailed ways

Embodiment shown in Fig. 1, Fig. 2.

In Figure 1, the DC high voltage from the high-voltage power supply box is 13KV, the variable resistor is 5.1MO, and there are 8 groups of positive and negative electrode plates. LED is an ordinary light emitting diode.

In Fig. 2, the positive and negative outputs of the high-voltage power supply box (not marked in Fig. 2) are connected to the positive support rod 2 and the negative support rod 4; The two ends of the variable resistance and the forward LED indicator in series are electrically connected between the negative electrode plate 7 and the negative support rod 4, because the voltage between them is not high during operation, so 5 is called a low-voltage insulator. The variable resistor and the LED lamp are arranged in the low-voltage insulator 5 .

Claims (2)

1. An electrostatic oil fume purification device with independent and adjustable load, which is composed of a housing, an air inlet, an air outlet, a high-voltage electrostatic area and a high-voltage power supply box, and is characterized in that: the high-voltage electrostatic area is composed of several groups of positive electrodes and Composed of negative electrodes, each group of electrodes is connected in series with the high-voltage output of the high-voltage power supply box. 2 . The electrostatic oil fume purification device with independently adjustable load according to claim 1 , wherein the resistor can be a rheostat and an LED indicator light connected in series in forward direction. 3 .

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