JPH11197546A - Electronic dust collector and air conditioner provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal electric discharge between an electric discharge electrode and a dust collection electrode, in an electronic dust collector for allowing the dusts contained in air to be stuck to the dust collection electrode by an electric discharge work between the electric discharge electrode and the dust collection electrode, and an air conditioner provided with the electronic dust collector. SOLUTION: A tube 66 having insulation property is covered on the outer periphery of a discharge wire attaching part consisting of an extension spring 65, etc. Thus, a distance between the extension spring 65 and the dust collection electrode 70 becomes short and abnormal discharge which may happen by concentralization of an electric field can be prevented, and deterioration of efficiency of dust collection and a generation of uncomfortable abnormal sound can be restrained. Also, sticking of dusts on non-heat generation part 70a of the dust collection electrode 70 present on a position confronting to the extension spring 65 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic precipitator and an air conditioner with an electronic precipitator, and more particularly to a technique for preventing abnormal discharge that can occur between electrodes of an electronic precipitator. It is.

[0002]

2. Description of the Related Art Conventionally, there is an electronic dust collector as a device for purifying air by collecting dust and fine particles contained in the air by using a discharge action. This type of electronic dust collector has a discharger that discharges between a discharge wire and a discharge plate provided in parallel to the discharge wire (this becomes a dust collection electrode). A configuration is generally used in which a tension coil spring (spring) or the like is attached to the end, and the positioning is fixed by the tension of the tension coil spring. In such a configuration, abnormal discharge may occur due to electric field concentration between the end of the discharge wire and the dust collecting electrode, and unpleasant noise may be generated. In order to solve such a problem, it is known to cover the end of the discharge wire with an insulating tube (see, for example, JP-A-6-254436).

[0003]

However, in the configuration in which the tension coil spring (spring) is attached to the end of the discharge wire as described above, the apparent diameter of the tension coil spring is larger than that of the discharge wire. The distance between the tension coil spring and the discharge plate (dust collection electrode) is reduced, and abnormal discharge easily occurs between the tension coil spring and the discharge plate (dust collection electrode).

In order to prevent abnormal discharge between the tension coil spring portion of the discharge wire and the dust collecting electrode, a portion of the dust collecting electrode facing the tension coil spring portion is separated from the tension coil spring portion. It is conceivable to bend in the direction to increase the distance between them, but in such a configuration,
If the electronic dust collector is installed in the air conditioner,
Since various metal parts are present in the vicinity, abnormal discharge with these metal parts becomes a new problem.

[0005] For example, in JP-A-59-20389, a discharge wire is provided between two dust collecting electrode plates, a voltage is applied to the discharge wire, and a corona discharge is caused to occur. An electric precipitator that collects dust by charging dust contained in the airflow flowing between the electrode plates and attaching the dust to the dust collecting electrode plate is shown. One end of the discharge wire is supported via a spring. And is positioned and fixed by the tension of the spring. In this electrostatic precipitator, when the natural frequency of the discharge wire and the electrical excitation frequency match when a voltage is applied, the amplitude of the discharge wire increases, and spark discharge occurs between the discharge wire and the dust collection electrode plate. It becomes a factor. Therefore, in order to prevent the spring from suddenly expanding and contracting, the outer periphery of the spring is surrounded by a tube made of an elastic material such as rubber or vinyl. Thus, the frequency amplitude of the self-oscillation of the discharge wire is shifted to suppress the oscillation. However, the tube made of an elastic material is not intended for measures against spark discharge in the spring part, because the electrode plate is not opposed to the spring part. In addition, the dust collection efficiency is better when the effective length of the dust collection electrode and the effective length of the discharge wire are substantially the same, but the one disclosed in the above publication does not have such a length relationship. , Dust collection efficiency is not high.

Further, recently, an oxidation-decomposition type catalyst layer is formed on the surface of a dust collecting electrode, and a sheath heater is provided therein. The heater oxidizes and decomposes dust adsorbed on the dust collecting electrode to remove the dust. A cleaning type (maintenance-free type) is being considered. In this configuration, the sheathed heater of the dust collecting electrode has non-heat-generating portions at both ends, and the non-heat-generating portions cannot oxidize and decompose dust. In order to prevent adhesion as much as possible, a discharge electrode is provided only in an area facing the heat generating portion. Then, as a result, the spring at the end of the discharge wire faces the non-heat generating portion at the end of the dust collecting electrode, and the above-described abnormal discharge at the spring portion of the discharge wire becomes a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and prevents discharge from a tension coil spring portion of a discharge wire, and can cause abnormal discharge even when incorporated in an air conditioner. Another object of the present invention is to provide an electronic dust collector having good dust collection efficiency and an air conditioner having the same. Another object of the present invention is to provide an electronic precipitator suitable for a self-cleaning precipitator and an air conditioner having the same, which prevents discharge from a tension coil spring portion of a discharge wire.

[0008]

In order to achieve the above object, the present invention comprises a discharge electrode and a dust collection electrode which are provided in parallel at a predetermined interval and between which a high voltage is applied. In an electronic precipitator that collects dust contained in air to a dust collecting electrode by using a discharging action, a discharge wire constituting a discharge electrode has a discharge wire attachment portion having both ends formed by a tension coil spring or the like. And a tube made of an insulating material is placed over the outer periphery of the discharge wire mounting portion.

In this configuration, during the dust collecting operation of the electronic dust collector, a high voltage is applied between the discharge electrode and the dust collector, and dust contained in the air sucked into the dust collector is discharged. By being ionized by the gas and being adsorbed on the dust collecting electrode, the intake air is cleaned. Here, the apparent diameter of the tension coil spring of the discharge electrode is larger than the discharge wire, and therefore, the distance between the tension coil spring and the dust collection electrode is shortened. The electric field is concentrated and abnormal discharge is likely to occur. In the present invention, the tension coil spring is covered with a tube made of an insulative material, and the tube cuts off the discharge between the tension coil spring and the dust collection electrode. It is possible to prevent abnormal discharge from occurring between them.

It is preferable that the dust collecting electrode has an oxidative decomposition type catalyst layer formed on the outer peripheral surface thereof and has a built-in heater for self-cleaning the dust collecting electrode. . In this configuration, at the time of self-cleaning, the heater is energized, the temperature of the catalyst layer of the dust collecting electrode is raised, and the dust adhering to the dust collecting electrode is oxidized and decomposed stepwise by the oxidizing action of the catalyst. The dust collecting electrode is self-cleaned by turning the dust into a colorless and odorless gas of carbon dioxide and water vapor.

It is desirable to use a heat-resistant tube having a large insulation resistance, such as a silicon rubber tube, as the tube. In this configuration, even if the temperature of the dust collecting electrode rises during self-cleaning, the tube does not deform.

The heater built in the dust collecting electrode is a sheathed heater, and has a non-heat generating portion at both ends, and the discharge wire attaching portion is located at a position facing the non-heat generating portion at both ends of the dust collecting electrode. It is desirable that they are arranged. In this configuration, the distance between the tension coil spring in the discharge wire mounting portion and the non-heating portion of the dust collecting electrode is reduced by the diameter of the tension coil spring, and abnormal discharge is likely to occur. The discharge from the tension coil spring is shut off by the tube. Therefore, no discharge occurs between the discharge wire attachment portion and the non-heating portion of the dust collection electrode, and dust is less likely to adhere to the non-heating portion of the dust collection electrode.

Further, the present invention is an air conditioner in which the above-mentioned electronic dust collector is arranged in a ventilation path in the machine. In this configuration, even when various metal parts are present around the extension coil spring at the discharge wire attachment portion, the discharge from the extension coil spring is cut off by the tube covered by the extension coil spring. In addition, it is possible to prevent abnormal discharge from occurring between the metal component and the extension coil spring.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner with an electronic dust collector according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view of an air conditioner equipped with an electronic dust collector, FIG. 2 is a side view of the air conditioner, FIG. 3 is a partial perspective view of an electronic dust collector, and FIG. FIG. 5 is a schematic view of a discharge electrode and a dust collecting electrode constituting an electronic dust collector.

The air conditioner 1 with an electronic dust collector has both an air conditioning function of cooling or heating indoor air and a dust collecting function of removing dust contained in the indoor air and purifying the air. Is mounted on a wall or the like via a mounting plate 2 (FIG. 2). Air conditioner 1
Has a casing 10 in which the front surface is opened as an air intake port 11 and an air discharge port 12 is provided below the air intake port 11 and a front grill 21 and is mounted on the air intake port 11 of the casing 10. A front panel 20, a heat exchanger 30 provided in the casing 10 facing the suction port 11 of the casing 10, and a heat exchanger 30 for flowing air from the suction port 11 to the discharge port 12 via the heat exchanger 30. , A cross-flow type fan 40 provided on the back side of the discharge port 12
And an electronic dust collector 50 arranged in the ventilation passage 31 on the back side of the heat exchanger 30. Further, a filter 32 is provided between the front panel 20 and the heat exchanger 30. In addition, the discharge port 12 of the casing 10
An angle-adjustable louver 13 is provided. A control circuit 15 for controlling the entire air conditioner 1 is provided inside the casing 10. The heat exchanger 30 is connected to a heat exchanger of an outdoor unit (not shown) by a refrigerant pipe.

The electronic precipitator 50 is provided with a linear discharge electrode 60 extending in a horizontal direction and a predetermined distance from the discharge electrode 60 in parallel, and a sheath heater 71 for self-cleaning. A rod-shaped dust collecting electrode 70 containing
A heat shield plate 80 for shielding the heat of the sheath heater 71 of the dust collecting electrode 70 and holding the discharge electrode 60 and the dust collecting electrode 70 is provided.
0 is attached to the surface of the vertical back plate 18 of the casing 10 so that the front side of the casing 10 faces the inside of the ventilation passage 31.

The discharge wire 61 constituting the discharge electrode 60 is held via an extension coil spring 65 at an electrode 64 (feeding portion) extending from an insulator 63 attached to a holding member 62 with hooks 61a at both ends thereof. It is positioned and fixed by the tension of the tension coil spring 65. Also, the discharge wire 61
, A voltage is applied from the electrode 64 through the tension coil spring 65. These tension coil spring 65 and discharge wire 61
Of the discharge wire mounting portion of the present invention, and a tube 66 is covered on the outer periphery of the discharge wire mounting portion. The tube 66 is made of silicone rubber having an insulating property and a high heat resistance, and is fitted and fixed to the insulator 63. In order to cover the tube 66 on the discharge wire mounting portion, the discharge wire 61 is inserted into the tube 66 and then the discharge wire 61 is inserted.
Is connected to the tension coil spring 65, and then the tube 66 may be fitted into the insulator 63.

The dust collecting electrode 70 is located on the leeward side of the ventilation passage 31 with respect to the discharge electrode 60 at a predetermined distance from the discharge electrode 60 (the distance between the discharge wire 61 and the dust collecting electrode 70 is, for example, about 14 mm).
mm), and the dust collecting electrode 70 is fixed to the holding member 74 by locking members 73 at both ends 72 in the length direction. A positive DC voltage and a negative DC voltage are applied to the discharge electrode 60 and the dust collecting electrode 70 during the air cleaning operation, respectively. The holding member 62 and the holding member 74 are fixed to the heat shield plate 80.

FIG. 6 is a sectional view of a main part of a dust collecting electrode 70 constituting the electronic dust collector 50. The dust collecting electrode 70 has a built-in sheath heater 71. The sheath heater 71 includes an aluminum metal tube 75 and an electric resistance wire 76 inserted into the metal tube 75. A predetermined portion of the surface is provided with a catalyst layer 77 made of a catalyst material represented by zeolite, activated alumina, manganese dioxide and the like.
Are formed by coating or welding. Zeolites (generally referred to as zeolite) form a three-dimensional network having cavities, which promote the reaction of molecules adsorbed within the cavities. Activated alumina (Al2 O3) is an alumina fine powder having a high adsorption capacity, a small crystal grain size, a large surface area, and is suitable as a catalyst, a catalyst carrier, and an adsorbent. Manganese dioxide (MnO2) has a function as a catalyst similarly to the above-mentioned zeolite and activated alumina. The metal tube 75 is filled with magnesium oxide 78 so that the metal tube 75 does not contact the electric resistance wire 76.
Since the end portion 75a of the metal tube 75 is sealed by the glass sealing material 79, non-heating portions 70a are formed at both ends of the sheathed heater 71 as shown in FIG. The non-heating portion 70 a is provided with the tension coil spring 6 of the discharge electrode 60.
5 is arranged at a position facing the same. Also, the dust collecting electrode 7
A catalyst layer 77 is formed on the surface of the heat generating portion 70b other than the zero non-heat generating portion 70a.

Next, the operation of the air conditioner 1 with a dust collector configured as described above will be described. During air conditioning, by operating the heat exchanger 30 and the fan 40, the room air is supplied to the front grill 21 of the front panel 20 and the filter 32.
And is sucked into the casing 10 through the heat exchanger 30.
After being cooled or heated in the process of passing through, the air flows through the ventilation path 31 on the back side from top to bottom. The air passing through the ventilation passage 31 passes around the dust collector 50. Here, a high voltage is applied between the discharge electrode 60 and the dust collection electrode 70 of the dust collector 50, and corona discharge occurs between the electrodes 60 and 70. Therefore, dust such as fine particles of tar (oil and smoke) and cotton dust existing in the air around the discharge electrode 60 is positively charged. As a result, due to the Coulomb force between both electrodes,
It is attracted to the dust collecting electrode 70 and collected by the dust collecting electrode 70, and electric dust is collected. When fine particles containing an odor component are contained in the air, the odor component is adsorbed and deodorized by the catalyst layer 77 of the dust collecting electrode 70. Thus, the air that has passed through the heat exchanger 30 is passed through the ventilation passage 31 on the rear side.
And is discharged into the room from the air discharge port 12.

Here, since the apparent diameter of the tension coil spring 65 is larger than the discharge wire 61 and the distance between the tension coil spring 65 and the dust collecting electrode 70 is short, the electric field is concentrated between the two. Although abnormal discharge is likely to occur, in the present invention, by placing an insulating tube 66 over the outer circumference of the tension coil spring 65 of the discharge electrode 60, the discharge between the tension coil spring 65 and the dust collection electrode 70 is formed. To prevent occurrence of abnormal discharge. As a result, it is possible to suppress a reduction in dust collection efficiency and generation of unpleasant noise. Further, since no discharge is performed from the tension coil spring 65, abnormal discharge does not occur between the various coil components such as the heat exchanger 30 and the tension coil spring 65. Further, since the effective length of the discharge electrode 60 and the effective length of the dust collecting electrode 70 can be made substantially equal while preventing abnormal discharge,
Dust collection efficiency is improved. Furthermore, the extension coil spring 65
Can be prevented from adhering to the non-heat-generating portion 70a of the dust collecting electrode 70 at a position opposite to the above.

Next, when power is supplied to the sheath heater 71 during self-cleaning, the temperature of the catalyst layer 77 is raised, and the dust adhering to the heat generating portion 70b of the dust collecting electrode 70 is oxidized and decomposed stepwise by the oxidizing action of the catalyst. Finally, the dust collecting electrode 70 is self-cleaned using the dust as a gas containing carbon dioxide and water vapor as components. In addition, since the tube 66 is a silicon rubber tube having excellent heat resistance, the tube 66 is not deformed even if heat from the heater 71 is transmitted to the tube 66.

Further, since the dust collecting electrode 70 is displaced to the leeward side of the discharge electrode 60, the dust is collected by the wind force of the air flowing through the ventilation passage 31 and the Coulomb force received by the dust from the dust collecting electrode 70. It will go to the dust electrode 70 direction. Thereby, more dust can be made to adhere to the dust collecting electrode 70, and the dust collecting effect of the dust collector 50 is improved.

The present invention is not limited to the above embodiment, but can be variously modified. For example, in an electronic precipitator having only an air purifying function, a tube 66 may be placed on a tension coil spring 65 of the discharge wire 61. As a method of fixing the tube 66 to the insulator 63, a cut is formed in the tube 66, a protrusion is provided in the insulator 63, the tube 66 is fitted into the insulator 63, and the tube 6 is fixed.
The tube 66 may be fixed by engaging the notch 6 with the projection of the insulator 63.

[0025]

As described above, according to the electronic precipitator according to the present invention, the tension coil spring and the precipitator can be collected by covering the outer periphery of the discharge wire mounting portion of the precipitator with the insulating tube. It is possible to prevent abnormal discharge that can occur due to concentration of an electric field between the electrodes and to suppress occurrence of unpleasant abnormal noise and the like. In addition, when the electronic dust collector is incorporated in an air conditioner, abnormal discharge can be prevented from being generated between the extension coil spring and surrounding metal parts. Is suitable for being mounted in an air conditioner. In addition, since the effective length of the dust collecting electrode and the effective length of the discharge wire can be made substantially equal while preventing abnormal discharge, the dust collecting efficiency can be improved.

Further, a sheath heater having a non-heat generating portion at both ends is built in the dust collecting electrode, and a discharge wire mounting portion covered with a tube is disposed at a position facing the non-heat generating portion at both ends of the dust collecting electrode. By doing so, it is possible to prevent discharge between the tension coil spring of the discharge wire mounting portion and the non-heating portion of the dust collecting electrode, and to prevent dust from adhering to the non-heating portion of the dust collecting electrode. This dust collector is suitable as a self-cleaning type electronic dust collector.

Further, by using a silicon rubber tube having high insulation resistance and excellent heat resistance as the tube, the temperature of the dust collecting electrode during self-cleaning is increased, and even if this heat is transmitted to the tube, the tube is deformed. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of an air conditioner with an electronic dust collector according to an embodiment of the present invention.

FIG. 2 is a side view of the air conditioner with an electronic precipitator showing the flow of air during air conditioning.

FIG. 3 is a partial perspective view of the electronic dust collector.

FIG. 4 is a partial bottom view of the electronic dust collector.

FIG. 5 is a schematic view showing a configuration of a discharge electrode and a dust collection electrode of the electronic dust collector.

FIG. 6 is a sectional view of a main part of a dust collecting electrode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner with an electronic dust collector 31 Ventilation path 50 Electronic dust collector 60 Discharge electrode 61 Discharge wire 64 Electrode (power supply part) 65 Tension coil spring 66 Tube 70 Dust collecting electrode 70a Non-heating part 71 Sheath heater 77 Catalyst layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F24F 7/00 F24F 1/00 371B H05B 3/44 1/02 381B

Claims (5)

[Claims] A discharge electrode and a dust collection electrode are provided in parallel at a predetermined interval and a high voltage is applied between the discharge electrode and a dust collection electrode, and the dust contained in the air is collected by using a discharge action. In the electronic dust collector for collecting dust, the discharge wire constituting the discharge electrode is attached to a power supply unit via a discharge wire attachment part formed of a tension coil spring or the like, and the discharge wire is attached to the discharge wire. An electronic dust collector, wherein a tube made of an insulating material is covered on the outer periphery of the portion. 2. The dust collecting electrode according to claim 1, wherein an oxidative decomposition type catalyst layer is formed on an outer peripheral surface of the dust collecting electrode, and a heater for self-cleaning the dust collecting electrode is built in the inside. Item 2. An electronic dust collector according to Item 1. 3. The electronic dust collector according to claim 2, wherein a heat-resistant tube having a large insulation resistance, such as a silicon rubber tube, is used as the tube. 4. A heater incorporated in the dust collecting electrode is a sheathed heater, and has a non-heat generating portion at both ends, and the discharge wire attaching portion faces non-heat generating portions at both ends of the dust collecting electrode. 3. The device according to claim 2, wherein the device is arranged at a position.
Or the electronic dust collector according to claim 3. 5. An air conditioner, wherein the electronic dust collector according to claim 1 is arranged in a ventilation path in the machine.