JPH0639519U - Air purifier - Google Patents

Abstract

(57) [Abstract] [Purpose] The ozone concentration generated from the discharge electrode 23 of the charging unit 21 is kept below a threshold value at which a person feels ozone odor, and a high voltage is applied to the charging unit 21 without considering the ozone generation amount. It is possible to suppress the decrease in the dust collection rate due to the decrease in the humidity of the intake air. [Structure] The charging section 21 of the air cleaning device 20 is formed by stacking a discharge electrode 23 and a discharge counter electrode 24 facing the discharge electrode 23, and the discharge electrode 23 of the charging section 21.
A heater 26 is provided in the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air cleaning device for use in, for example, an air conditioner for a vehicle, for removing dust and the like contained in air sucked into an air conditioning duct by a blower.

[0002]

[Prior art]

 In recent years, comfort has been demanded in the passenger compartment. For this reason, the dust and the like contained in the air taken in by the blower is removed, and air with a high degree of cleanliness is not supplied to the passenger compartment. There is a growing need to incorporate air purifiers into.

Therefore, a device incorporating an electric dust collecting type air cleaning device in an air conditioning duct has already been devised (see Japanese Utility Model Publication No. 3-49048).

In such an electric dust collecting type air cleaning device, a charging unit (corona discharge unit) for charging dust is arranged in an air conditioning duct (in an air flow path), and the charged dust is collected on the downstream side thereof. And a dust collecting portion for collecting the dust. Of these, the charging part (corona discharge part) has a discharge electrode having a plurality of pointed protrusions (discharge needles) and two electrodes having different discharge counter electrodes, and a high voltage is applied to the discharge electrode. , Dust that floats around the periphery is charged.

[0005]

[Problems to be solved by the device]

 However, in the configuration of the air cleaning device described above, when corona discharge is continued for a long time in the charging part, the tip of the protruding part of the discharge electrode is worn and rounded, and the discharge area becomes large, so a large amount of ozone is generated. It will be. For this reason, the ozone concentration in the air blown into the vehicle compartment from the air outlet exceeds 0.02 ppm, which is the threshold value at which a person feels an ozone odor, and the passengers feel uncomfortable due to this ozone odor. .

Further, in order to enhance the charging ability of the charging section of the air cleaning device, it is effective to increase the voltage applied to the charging section, but the amount of ozone generated with this is also increased, and therefore, the same as above. Moreover, there is also a problem that the passenger feels uncomfortable due to the smell of ozone.

Further, when the humidity of the intake air becomes high, the discharge efficiency of the charging section is lowered due to the influence of moisture in the air, and the dust collection rate in the dust collecting section is also lowered. is there.

In view of the above problems, the present invention utilizes the fact that the ozone concentration fluctuates due to temperature changes, and stabilizes or reduces the ozone concentration to a value below the threshold at which a person feels an ozone odor. Can be prevented from feeling unpleasant due to ozone odor, and by applying a high voltage to the charging part, the generation of ozone odor can be suppressed even if the charging ability is improved, and even if the humidity is high, efficient collection is possible. It is an object of the present invention to provide an air cleaning device that can obtain a dust rate.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, an air cleaning apparatus according to the present invention charges dust formed by alternately arranging a discharge electrode having a protrusion and a discharge counter electrode facing the discharge electrode in an air conditioning duct. It has a charging section and a dust collecting section provided on the downstream side of the charging section for collecting charged dust, and a heater is provided at the discharge electrode of the charging section.

[0010]

[Action]

 Therefore, the heater portion provided on the surface of the discharge electrode of the charging portion can set the air temperature in the vicinity of the charging portion so that it is always at a desired temperature for heating, so that the ozone concentration can be changed by a person. It can stabilize or reduce the ozone odor to below the threshold level, and lower the humidity in the air.

[0011]

【Example】

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

A vehicle air conditioner 1 according to the present invention shown in FIG. 1 includes a blower unit 9 including at least a fan 10 and an intake switching door 14, and a cooling unit 5 including at least an evaporator 6 downstream thereof. Further, on the downstream side, a hot air unit (not shown) composed of a heater core (not shown) and an air mixing door provided in front of the heater core is basically configured.

Of these, the blower unit 9 has an outside air intake port 12 and an inside air intake port 13 at its upper part, and an intake switch provided at a portion where the outside air intake port 12 and the inside air intake port 13 branch. By opening and closing the door 14, air is appropriately selected and introduced into the vehicle air conditioner 1.

A fan 10 is arranged below the intake switching door 14. The fan 10 blows air into the air-conditioning duct 2 and blows the air downstream from a blower port 16 formed in a portion where the diameter is gradually increased. Normally, a sirocco fan is used. The present invention is not limited to this, and is driven by the motor 11 provided at the bottom. A prefilter 15 is provided on the downstream side of the fan 10 to remove coarse dust mixed in the blown air.

An evaporator 6 is housed in the cooling unit 5 located on the downstream side of the blower unit 9, and the evaporator 6 cools the air sent from the fan 10 and sends it to the warm air unit on the downstream side. A cooling cycle is configured by piping connection with a condenser, a compressor, an expansion valve, and the like, which are not shown.

An air cleaning device 20 is arranged on the upstream side of the evaporator 6. In this way, the air purifying device 20 is arranged on the upstream side of the evaporator 6 because the dust and the like are prevented from adhering to the evaporator 6 to prevent a strange odor from being generated from the evaporator 6. This is because it is possible to achieve indoor comfort.

As shown in FIG. 1, the air cleaning device 20 is basically composed of a charging section (iolyzer) 21 and a dust collecting section (collector) 30 provided behind the charging section 21. is there.

Of these, as shown in FIG. 1 and FIG. 2, the charging unit 21 has a discharge electrode 23 connected to the positive electrode side of the DC power source 22 and a stack of layers alternately facing the discharge electrode 23. The discharge counter electrode 24 is arranged and is connected to the negative electrode side of the DC power source 22. By applying a high voltage between the two electrodes, floating dust can be charged.

As shown in FIGS. 2 and 3, the discharge electrode 23 has a plurality of pointed projections 25 on the sides of the elongated metal body. The discharge counter electrode 24 has a flat plate shape.

On the other hand, as shown in FIG. 1, the dust collecting unit 30 located on the downstream side of the charging unit 21 has a high voltage connected to the float electrode 31 described below in a state of being suspended from the power source and the ground. The side electrode 32 and the grounded low-voltage side counter electrode 33 are alternately arranged in a laminated manner. By applying a high voltage to the two electrodes, the high-voltage side electrode 32 and the low-voltage side counter electrode are formed. It is designed to adsorb the charged dust that is about to pass through the space 33.

The float electrode 31 is electrically connected to the high-voltage side electrode 32, and is in a state of floating from the power source and the ground similarly to the high-voltage side electrode 32. Further, since the ion current is supplied to the float electrode 31 from the discharge electrode 23 of the charging unit 21, a so-called bias voltage is automatically induced to hold a predetermined voltage lower than the voltage of the DC power supply 22. It is configured like. For this reason, an electric field is generated between the high-voltage side electrode 32 and the low-voltage side counter electrode 33, where the bias voltage is induced to hold a predetermined voltage.

On the other hand, the discharge electrode 23 of the charging section 21 is provided with a heater 26 as shown in FIGS. In this heater 26, an insulating coating 28 made of alumina or the like is attached to the surface of the discharge electrode 23, and an electric resistance member 27 such as tungsten containing ceramics is further formed thereon by means such as screen printing. It is formed by printing on the insulating film 28, and is provided linearly along the periphery of the discharge electrode 23. Both ends of the electric resistance member 27 are connected to the positive pole and the negative pole of the heater power source 29, respectively. However, the configuration of the heater 26 may not be the one described above as long as it can heat the air in the vicinity of the corona discharge.

The temperature emitted from the electric resistance member 27 is not particularly limited, but is preferably around 80 ° C. to 150 ° C. if possible. This is because the experimental results show that a stable ozone concentration can be obtained at around 80 ° C. This is because it becomes possible to adjust it so that Further, it is known that ozone is decomposed into oxygen at about 150 ° C, so that the generated ozone can be immediately decomposed on the spot, and it is not necessary to consider the amount of ozone generated.

With the above configuration, even if the charging unit 21 continues corona discharge for a long time, the tip of the protrusion 25 of the discharge electrode 23 is worn and rounded, and a large amount of ozone is generated, the ozone concentration is high. Can be adjusted so that it is always below the threshold value at which humans can smell the ozone, and even if a high voltage higher than the current voltage is applied to the charging section 21, a large amount of ozone generated due to it can be generated near the charging section 21. It can be immediately decomposed into oxygen.

Further, as shown in FIG. 5, by heating the air with the heater 26, the humidity in the air can be lowered, so that the dust can be reduced compared to the charging unit 21 without the heater 26. It is possible to prevent the influence of moisture in the air or the like when being charged.

[0026]

[Effect of device]

 As described above, according to the present invention, since the concentration of ozone generated from the discharge electrode of the charging section can be made constant or reduced, always keep the ozone concentration below the threshold value at which humans feel ozone odor. This makes it possible to prevent passengers from feeling uncomfortable due to ozone odor.

Further, even if the voltage applied to the charging section is increased and a large amount of ozone is generated from the discharge electrode of the charging section, the ozone is immediately decomposed into oxygen in the vicinity of the charging section. Since a high voltage can be applied freely without considering the amount of generation, it is possible to increase the charging ability.

Furthermore, even if the humidity of the intake air is high, the heat of the heater can reduce the water content in the air, which lowers the discharge efficiency of the charging section and thus the dust collection rate of the dust collection section. Can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram in which an air cleaning device is arranged in a vehicle air conditioner according to the present invention.

FIG. 2 is an enlarged configuration diagram of a charging unit of the above air purifying apparatus.

FIG. 3 is an enlarged configuration diagram of a discharge electrode of the charging unit of the above.

FIG. 4 is a sectional view taken along line AA of FIG. 4 above.

FIG. 5 is a characteristic diagram showing a correlation between humidity and a dust collection rate with and without a heater provided in a discharge electrode of the same charging section.

[Explanation of symbols]

 1 Vehicle Air Conditioner 2 Air Conditioning Duct 20 Air Purifier 21 Charging Part 23 Discharge Electrode 24 Discharge Counter Electrode 25 Projection 26 Heater 30 Dust Collection Part

Claims (1)

[Scope of utility model registration request] 1. A charging unit for charging dust, which is formed by alternately arranging a discharge electrode having a protrusion and a discharge counter electrode facing the discharge electrode in an air-conditioning duct, and a charging unit provided downstream of the charging unit. An air purifying device, comprising: a dust collecting part for collecting charged and charged dust, and a heater is provided at a discharge electrode of the charging part.