JPH02164466A - Electric dust collector - Google Patents

Abstract

PURPOSE:To control the vibration of ionization lines when reverse ionization phenomenon is generated by installing a support for supporting middle sections of the ionization lines on a main frame. CONSTITUTION:A main frame 12 with ionization lines 21 disposed in tension and an opposing electrode 37 with electrode plates 38 facing the ionization lines 21 are provided. A support 20 to support middle sections of the ionization lines 21 is provided on a main frame 12. As a result, even if back corona discharge is generated by reverse ionization phenomenon, the ionization lines can be prevented from vibrating with large amplitude.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Prior Art) The present invention relates to an electric dust collector incorporated in, for example, an air conditioner.

(Prior Art) Recently, in order to remove fine dust from the indoor air circulated by the air conditioner, an electric dust collector has been incorporated into the air conditioner.

The electrostatic precipitator is usually composed of an ionization line and a counter electrode body having an electrode plate facing the ionization line. Then, the ionization wire is connected to the positive side of a high-voltage DC power supply, and the counter electrode body is connected to the negative side to form an unequal electric field between them, and the corona discharge in this electric field is used to charge the dust. However, some of the dust ends up on the counter electrode. In an electrostatic precipitator having such a configuration, in order to improve its dust collection ability, the length of the counter electrode body is lengthened, and as a result, the span of the ionization wire is also lengthened. was.

By the way, there is dust on the electrode plate of the counter electrode body, 5i.
When highly insulating dust such as Oz, AIzOa, and alkalis adheres, a so-called reverse ionization phenomenon occurs, and positive ions accumulate on the surface of the dust, thereby generating back corona discharge toward the ionization line. -Then, the electric field is disturbed by the back corona discharge and the local electric field strength increases, so the ionized wire vibrates with resonance and approaches the electrode plate, starting a continuous spark discharge. Therefore, the ionized wire may be disconnected due to the spark discharge.

(Problem to be Solved by the Invention) Conventionally, when a back corona discharge occurs due to the reverse ionization phenomenon, the ionization line vibrates greatly and approaches the counter electrode plate, which causes spark emission 7d. This could lead to line breaks.

This invention was made based on the above-mentioned circumstances, and its purpose is to provide an electrostatic precipitator capable of suppressing the vibration of ionization rays when a reverse ionization phenomenon occurs. It's about doing.

[Structure of the invention] (Means and effects for solving the problems) In order to solve the above problems, the present invention provides a main frame on which an ionizing wire is stretched, and a main frame having an electrode plate facing the ionizing wire. In the electrostatic precipitator equipped with an electrode body, the main frame is provided with a support that supports a midway portion of the ionization wire. As a result, even if back corona discharge occurs due to a reverse ionization phenomenon, the ionization line is made less likely to vibrate, thereby suppressing the occurrence of spark discharge.

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

FIG. 10 shows an air conditioner 2 incorporating the electric dust collector 1 of the present invention, and the air conditioner 2 has a main body 3. As shown in FIG. A front panel 4 is provided on the front surface of the main body 3, and a front plate 5 of the front panel 4 is formed to be openable and closable with its upper end as a fulcrum.

As shown in FIG. 11, a heat exchanger 6 is installed in the main body 3 in an inclined manner with its upper end positioned further back than its lower end. A blower 7 is disposed at the lower part of the back side of the heat exchanger 6, and the blower 7 circulates indoor air as shown by arrows in the figure. In other words, indoor air is sucked in through the suction port 8 formed on the front panel 4, undergoes heat exchange in the heat exchanger 6, and then is blown out through the blowout port 9 formed on the bottom of the main body 3. There is.

At the upper part of the front side of the heat exchanger 6, a deodorizing filter 11 is removably provided on the right side in FIG. 10, and the electrostatic precipitator 1 is provided on the left side. And the first
As shown by arrows in FIG. 1, a part of the circulating indoor air passes through the electric dust collector 1 and the deodorizing filter 11 to be dusted and deodorized.

The electric dust collector 1 includes a main frame 12 in the shape of a rectangular frame, as shown in FIGS. 1 to 3. Both ends of the main frame 12 in the width direction are an outer wall 13 and an inner wall 1.
4, and a first protrusion 15 and a second protrusion 16 are protruded from the inner surface of both ends of the outer wall 13 and the inner surface of both ends of the inner wall 14, respectively.

At both longitudinal ends of the main frame 12, an insulating block 17 made of thermosetting resin, which is a material with high tracking resistance, slides into the second protrusion 16 through engagement grooves 18 formed on both sides thereof. They are attached so that they can be freely engaged. A pair of semi-cylindrical hooks 19 are integrally molded on the two sides of each insulating block 17 with a predetermined pitch offset in the width direction of the main frame 12. These hooking parts 19 are stretched in a meandering manner by sequentially engaging one ionized wire 21. One end of this ionized wire 21 is fixed to the fixed part 22 of one insulating block 17 via a spring 23, and the other end is fixed to the fixed part 22 of one insulating block 17.
It is connected to a contact tab 24 provided on the upper surface of 7 via a spring 25. A first lead wire 26 from the positive side of a high voltage DC power supply (not shown) is connected to the contact tab 24.

A substantially intermediate portion of the ionized wire 21 stretched between the pair of insulating blocks 17 is supported by a support 20 molded from thermosetting resin like the insulating block 17. That is, the support 20 is attached to the inner wall 14 of the main frame 12 as shown in FIGS.
A vertical trunk 20a having approximately the same length as the dimension between the ionized wires 21, and a plurality of longitudinal trunks 20a protruding from the vertical trunk 20a at the same intervals as the ionized lines 21 and at a predetermined length in a direction orthogonal to the vertical trunk 20a. It is formed of a horizontal trunk 20b, rounded portions 20c provided on the upper surface side of both ends of each horizontal trunk 20b, and an engagement groove 20d carved in each rounded portion 20c along the longitudinal direction of the horizontal trunk 20b. ing. In addition, vertical executive 2
The edge portion between 0a and the lateral trunk 20b is chamfered.

As shown in FIG. 3, the support 20 having the above structure has both ends of its vertical trunk 20a removably engaged with four parts 14a provided on the inner surface of the middle part of each inner wall 14 of the main frame 12. Supported. The middle part of the span of the ionized wire 21 is slidably engaged and supported in the engagement groove 20d of the rounded part 20c in a state where it is slightly pushed upward. That is, the pair of insulating blocks 1 with which the ionization wire 21 directly contacts
Since only the support 7 and the support 20 are made of a thermosetting resin with high tracking resistance, increases in moldability and cost can be minimized, and the reliability of creeping leakage can be improved.

A notch 27 is formed at one end of one outer side wall 13 of the main frame 12, and a part of the earth contact 28 is formed by bending an elastic metal plate into a U-shape. It is provided to protrude outward from the outer wall 13. Further, elastic claws 29 are provided on the outer surface of both ends of one outer wall 13 in a protruding manner. A second lead wire 30 led from the negative side of the high voltage DC power supply is connected to the ground contact 28.

The upper frame 31 is detachably attached to the upper surface of the main frame 12 formed in this way. This upper frame 31 has a rectangular frame shape corresponding to the main frame 12 as shown in FIG. Through holes 32 are bored at intervals corresponding to the holes 21 over almost the entire length in the longitudinal direction. Furthermore, grooves 33 are formed on the outer surface of both ends of the upper frame 31 in the longitudinal direction at positions corresponding to the first protrusions 15 of the main frame 12, respectively. The upper frame 31 is detachably attached to the main frame 12 by elastically engaging the first protrusion 15 in the groove 33 thereof.

Further, guide portions 34 are provided at both ends of the upper surface of the upper frame 31 in the longitudinal direction so as to protrude along the width direction. A rectangular engagement piece 35 is provided at one end of these guide portions 34.
are provided substantially parallel to the plate surface of the upper frame 31, and a protrusion 36 is provided protruding from the other end.

A counter electrode body 37 is detachably attached to the upper surface of the upper frame 31. This counter electrode body 37 is formed by bending a metal plate, such as a stainless steel plate, into a U-shaped cross section, so that the length dimension is slightly smaller than the dimension between the pair of guide parts 34, and the plate A plurality of electrode plates 38 that fit into the through holes 32 of the upper frame 31 are cut and raised toward the inner surface of the surface. Note that a rib 38a is provided at the longitudinal center portion of the electrode plate 38, and the electrode plate 38 is divided into two by the rib 38a. Furthermore, a pair of first engagement holes 39 are bored in the upper surface of one end in the width direction of the counter electrode body 37 at intervals corresponding to the protrusions 36 of the upper frame 31.
A pair of second engagement holes 41 are bored on the longitudinally outer side of 9 at intervals corresponding to the pair of elastic claws 29 across the top and side surfaces. Furthermore, as shown in FIG. 10, the counter electrode body 37 is provided with a filter guide 42 made of synthetic resin over its upper surface and the side surface on one end side in the width direction. This filter guide 42 smoothly guides the air filter 46 when the air filter 46 is inserted between the counter electrode body 37 and the filter holder 45 shown in FIG. 10 provided on the main body 3 of the air conditioner 2. It is for.

Then, as shown in FIG. 5, the opposing electrode body 37 engages the opposite end corners of the other end in the width direction with the engaging pieces 36, and the electrode plate 38 is dropped into the interior through the through hole 32 of the upper frame 31. the first engagement hole 39 as shown in FIG.
At the same time, by elastically engaging the elastic claws 29 formed on the main frame 12 with the second engagement holes 41 as shown in FIG. It is worn. In this way, the counter electrode body 37
3, the ionized wire 21 stretched on the main frame 12 is located between the electrode plates 38 facing each other, and the ground contact 28 is elastically attached to the inner surface on the negative side in the width direction. Contact.

In FIG. 10, numeral 44 is a dust collector that constitutes the electric dust collector 1 together with the ionization line 21 and the counter electrode body 37. The dust collector 44 is detachably attached to the main frame 12 so as to be located downstream of the counter electrode body 37 in the direction of flow of indoor air.

This dust collector 44 is for collecting dust charged by the counter electrode body 37.

The electrostatic precipitator 1 having the above configuration has its main frame 12 fixed to the main body 3 of the air conditioner 2 and formed at the upper front surface of the heat exchanger 6 and at one end in the width direction of the main frame 12. It is provided with the elastic claw 29 facing downward.

According to the electrostatic precipitator 1 having such a configuration, the ionized wire 21 stretched between the hooks #19 of the pair of insulating blocks 17 of the main frame 12 is located approximately at the center of the length of the stretched span. is supported by support 20. In other words, the ionized wire 21 is supported by the support 20 at a portion where the amplitude is maximum when it vibrates.

Therefore, as the ionization wire 21 is used, highly insulating dust adheres to the ionization wire 21, and the ionization wire 21 is caused by reverse ionization.
Even if a back corona discharge toward 1 occurs, the vibration of the ionized line 21 can be suppressed and its amplitude can be reduced. Therefore, since the ionization line 21 can be prevented from coming too close to the counter electrode body 37, it is also possible to prevent spark discharge from occurring between them.

Further, the ionized wire 21 is connected to the engagement groove 20 of the support 20.
Since it is slidably engaged with and supported by the spring 23, d, the tension adjustment function of the springs 23, 25 provided at both ends of the spring 23, 25 is not impaired.

Further, the engagement groove 20d for supporting the ionized wire 21 was formed in the rounded portions 20c provided at both ends of the lateral trunk 20b. In other words, the contact position between the ionized wire 21 and the support 20 can be set at a sufficient distance from the center of the vertical trunk 20a, which is the center of the support 20, which increases the creepage distance and improves insulation. It can be measured.

Furthermore, since the ionized wire 21 is pushed up and fixed in contact with the support 20, there is no local discharge (spark discharge) due to non-contact between the ionized wire 21 and the support 20.

In the above embodiment, the vertical trunk 20a of the support 20 is provided with the horizontal trunk 20b, and two engagement grooves 20d are formed at both ends of the horizontal trunk 20b, so that the ionized wire 21 is supported at approximately the center of its span length at two locations. However, one engagement groove 20d
The support structure may be supported at only one place, and the support structure is not limited in any way.

[Effects of the Invention] As described above, in the present invention, the middle part of the span length of the ionization wire stretched on the main frame constituting the electrostatic precipitator is supported by a support. Therefore, since the span length of the ionized wire is shortened, even if back corona discharge occurs due to a reverse ionization phenomenon, the ionized wire can be prevented from vibrating with a large amplitude.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of the main frame, FIG. 2 is a plan view of the counter electrode body assembled on the upper frame, and FIG. 3 is a top view of the main frame. - An enlarged sectional view taken along the X-ray; Figure 4 is a plan view of the upper frame;
Figure 5 is a cross-sectional view taken along line A-A in Figure 2, Figure 6 is the same (cross-sectional view taken along line B-B, Figure 7 is the same < cross-sectional view taken along line C-C, Figure 8 is a plan view of the support, and Fig. 9 is a plan view of the support.
10 is a perspective view of the air conditioner, and FIG. 11 is a sectional view taken along line YY in the figure. 12...-mainframe, 20...support,...
- Ionization line, 7... Counter electrode body, 8... Electrode plate.

Claims (1)

[Claims] In an electrostatic precipitator comprising a main frame on which an ionizing wire is stretched, and a counter electrode body having an electrode plate facing the ionizing wire, the main frame includes a support that supports a midway part of the ionizing wire. An electric dust collector characterized by being provided with.