JPH11300149A - Air cleaner of vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner of vehicle air conditioner being superior in cleaning efficiency and also capable of well arranging a piping of an air conditioning heat exchanger. SOLUTION: In the air cleaner A of a vehicle air conditioner, an air cleaning filter 3 at a position where the flow speed of air stream 20 in air conditioning duct 1 is high is constituted of a three layered structure where a filtering type filter 31, an electrostatic filter 33, and an active carbon filter 34 are disposed from the upstream side, and the air cleaning filter 3 at a position where the flow speed of the air stream 20 in air conditioning duct 1 is low is constituted of a double layered structure where the filtering type filter 32 and the active coal filter 34 are disposed from the upstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier for a vehicle air conditioner installed in a vehicle.

[0002]

2. Description of the Related Art An air cleaning filter (filtration filter + electrostatic filter) is arranged upstream of an evaporator.
2. Description of the Related Art An air purifier for a vehicle air conditioner that removes particulates in air introduced into a duct has been conventionally known (Japanese Utility Model Laid-Open No. 5-32040).

[0003]

In this air purifying apparatus for an air conditioner for a vehicle, fine particles having a relatively large particle size are captured by a filter, and fine particles having a small particle size are adsorbed by an electrostatic filter. It is possible to obtain high cleaning efficiency without causing clogging of the filtration type filter. However, since ozone is generated by the electrostatic filter, the inventors set the activated carbon filter 3 between the electrostatic filter 100 and the evaporator 200.
It is considered that ozone is decomposed by disposing 00 (see FIG. 2).

However, it has been found that there are the following problems. The air cleaning filter 500 is a filtration type filter (thickness of about 20 mm) 400 and an electrostatic type filter (thickness of about 30 m).
m) 100, activated carbon filter (thickness about 10 mm) 300
Since it has three layers, a large space is required. However, as shown in FIG. 3, a pipe 210 of the evaporator 200 and a blower (inside / outside air switching box) 220 are provided at a place where the air cleaning filter 500 is installed, so that a three-layer air cleaning filter is installed. It is difficult.

An object of the present invention is to provide an air purifier for a vehicle air conditioner which is excellent in cleaning efficiency and can route piping of an air conditioner heat exchanger.

[0006]

Means for Solving the Problems According to the first aspect of the present invention, an air flow from the air inlet toward the air cleaning filter is generated by the operation of the blower disposed on the air inlet side of the air conditioning duct. The air flow is curved in the rotation direction of the blower and moves toward the air cleaning filter due to the characteristics of the blower. A filtration filter located at a location where the airflow velocity of the air conditioning duct is fast catches fine particles with a relatively large particle size.
The electrostatic filter electrostatically adsorbs fine particles having a small particle diameter, and the activated carbon filter decomposes ozone generated by the electrostatic filter. A filtration type filter arranged at a location where the airflow velocity of the air conditioning duct is low catches fine particles with a relatively large particle size,
The activated carbon filter decomposes ozone.

[0007] The air purifying filter at the portion where the flow velocity of the air flow is low has a two-layer structure in which a filtration filter and an activated carbon filter are arranged from the upstream side. This makes it possible to reduce the thickness of the air purifying filter at a portion where the flow rate of the air flow is low, and to secure a space for arranging the piping of the air conditioning heat exchanger.

[0008] A portion where the flow velocity of the air flow is low has a small absolute amount of the fine particles carried, and most of the fine particles having a small particle size are transported to a position where the flow velocity of the air flow is high by the fast air flow. Therefore, even if the electrostatic filter of the air cleaning filter is omitted in a portion where the flow velocity of the air flow is slow and the two-layer structure is omitted, the passage of fine particles having a small particle diameter increases only slightly, and there is no problem.

According to a second aspect of the present invention, there is provided a filter having a filter of 10 μm, which is disposed in a portion of the air-conditioning duct where the air flow velocity is high.
Capturing larger particles, electrostatic filter is 10μm
The activated carbon filter decomposes ozone generated by the electrostatic filter by electrostatically adsorbing particles less than the particles. 10μ filter-type filter placed in the airflow duct where air flow velocity is low
The activated carbon filter decomposes ozone by capturing fine particles larger than m. In addition, the part where the flow velocity of the air flow is low has a small absolute amount of the fine particles carried, and the majority of the fine particles having a diameter of less than 10 μm are carried to the part where the flow velocity of the air flow is high by the high air flow. Even if the electrostatic filter of the air cleaning filter at the portion where the flow velocity is low is omitted and the two-layer structure is omitted, the passage of fine particles of less than 10 μm increases only slightly, and there is no problem.

According to a third aspect of the present invention, the size of the filter of the air-conditioning duct, which is located at the position where the flow rate of the air flow is low, is finer than the size of the filter of the air-conditioning duct which is located at the position where the flow rate of the air flow is high. For example, fine particles having a small particle diameter that are conveyed to a site where the flow velocity of the air flow is low can be captured by the filtration filter. Accordingly, it is possible to suppress the passage of the fine particles having a small particle diameter due to the omission of the electrostatic filter in a portion where the flow velocity of the air flow is low.
Since the air flow rate and the absolute amount of fine particles carried are small in parts where the flow velocity of the air flow is low, the ventilation resistance does not increase significantly even if the size of the filtration filter is fine, and the progress of clogging does not Of the filtration type filter located at a site where the flow velocity is high.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (claims 1 and 2)
Will be described with reference to FIG. As shown in FIG. 1, an air purifying device A of a vehicle air conditioner has a blower 2 disposed on an air intake side of an air conditioning duct 1, and an air purifying filter 3 attached downstream of the blower 2. An evaporator 4, which is a heat exchanger for air conditioning, is provided downstream of the air purification filter 3.

The air-conditioning duct 1 has an air outlet (not shown) that opens into the front passenger compartment on the downstream side, from which the warm air flows toward an occupant or the like sitting on the front seat. Or cold air is blown out. An inside / outside air switching box (not shown) is provided upstream of the air conditioning duct 1, and a cylindrical blower case provided with a blower 2 is connected below the inside / outside air switching box. The inside / outside air switching box has an inside air introduction port (not shown) and an outside air introduction port, and an inside / outside air switching damper is assembled.

The blower 2 is composed of a centrifugal fan disposed in a blower case and a blower motor for driving the centrifugal fan, and the centrifugal fan rotates at a rotation speed according to a voltage applied to the blower motor. Note that the blower 2 may be a spiral type.

Most of the air flow 20 (high flow velocity) generated by the blower 2 flows along the nose 21 (downward to the right in the figure) and travels toward the air cleaning filter 3. A part 201 of the airflow 20 (having a low flow velocity) flows parallel to the air conditioning duct 1 (in the horizontal direction in the drawing), and heads toward the air cleaning filter 3.

At a portion where the flow rate of the air flow 20 is high (the lower side 4/5 of the air cleaning filter 3), the air cleaning filter 3
From the upstream side, filtration type filter 31, electrostatic type filter 3
3, and an activated carbon filter 34. In a portion where the flow velocity of the air flow 20 is low (upper ５ of the air cleaning filter 3), the air cleaning filter 3 has a two-layer structure in which a filtration filter 32 and an activated carbon filter 34 are arranged from the upstream side. I have.

The filtration type filter 31 (thickness: 20 mm)
The surface through which the air flow 20 passes has a substantially square shape and a particle size of 10
It is formed of filter paper having eyes capable of capturing fine particles larger than μm, and is folded in an accordion shape to increase the surface area. Filtration type filter 32 (thickness 20m
m) is formed of a filter paper having a substantially rectangular surface through which the air flow 20 passes and having eyes capable of catching fine particles having a particle size larger than 10 μm, similarly to the filtration type filter 31. It is folded in an accordion shape.

The electrostatic filter 33 (thickness 30 mm)
A plane through which the air flow 20 passes is substantially square, and a pair of wire-attached ionizers with needles and a particle size of 10 μm are provided.
and a spiral collector on which fine particles of less than m are charged and adsorbed. And to the ionizer and collector,
A high voltage of several thousand volts is applied from a high voltage generator (not shown).

The electrostatic filter 33 electrostatically adsorbs fine particles of less than 10 μm according to the following principle. Corona discharge occurs between the wires of the ionizer. The fine particles are positively charged when the microfluid passes through the space where the corona discharge occurs. The charged fine particles are attracted to the cathode of the collector and adsorb to the cathode.

The surface of the activated carbon filter 34 through which the air flow 20 passes is rectangular and substantially square, and has a honeycomb structure. The activated carbon filter 34 is located behind the filtration filter 32 and the electrostatic filter 33, and decomposes ozone generated by corona discharge of the electrostatic filter 33.

The evaporator 4 is a functional member forming a part of the refrigeration cycle, and has a pipe through which a refrigerant flows. The refrigeration cycle is configured by connecting a refrigerant compressor, a refrigerant condenser, a receiver, a decompression device, and an evaporator 4 in a ring shape with a refrigerant pipe.

The refrigerant compressor is driven by an engine of the vehicle via an electromagnetic clutch. The refrigerant condenser condenses and liquefies the high-temperature and high-pressure refrigerant compressed by the refrigerant compressor by receiving air from a cooling fan. The receiver temporarily stores the refrigerant condensed in the refrigerant condenser and allows only the liquid refrigerant to flow. The pressure reducing device decompresses and expands the liquid refrigerant guided by the receiver. The evaporator 4 evaporates the low-temperature and low-pressure refrigerant depressurized by the decompression device by passing the airflow 20 from the blower 2.

Downstream of the evaporator 4, an air mixing door (not shown) and a heater core (not shown) for heating the air passing through the air mixing door by using the cooling water of the engine as a heat source are provided. ing.

The air purifier A of the vehicle air conditioner has the following advantages. The air-cleaning filter 3 in a portion of the air-conditioning duct 1 where the flow rate of the airflow 20 is low has a two-layer structure in which a filter 32 and an activated carbon filter 34 are arranged from the upstream side. This makes it possible to reduce the thickness of the air purifying filter 3 at a portion where the flow velocity of the air flow 20 is low, and to provide a space 3 around the piping of the evaporator 4.
0 can be secured.

In the region where the flow velocity of the air flow 20 is low, the absolute amount of fine particles carried is small because the flow velocity is low.
0, the air is transported to a site with a high flow velocity, so that the air flow 20
In a region where the flow velocity is low, even if the electrostatic filter 33 is omitted to form a two-layer structure, the passage of the fine particles having a particle size of less than 10 μm through the filtration filter 32 increases only slightly, and there is no problem.

The present invention includes the following embodiments in addition to the above embodiment. a. The size of the filtration filter 32 arranged at a portion of the air conditioning duct 1 where the flow rate of the air flow 20 is low may be finer than the size of the filtration filter 31 located at a portion where the flow rate of the air flow 20 is high. Corresponding to).

For example, the fineness of the filtering filter 31 is set to a size suitable for capturing fine particles having a particle size of more than 10 μm, and the fineness of the filtering filter 32 is set to a fine particle having a particle size of 5 μm or more. May be set to the fineness of eyes suitable for capturing the image. In this case, the filtration type filter 32 having a particle diameter of less than 10 μm, which is conveyed to a portion where the flow velocity of the air flow 20 is low, is provided.
Can be captured. Thereby, it is possible to suppress the passage of the fine particles having a particle diameter of less than 10 μm due to the omission of the electrostatic filter 33 in the portion where the flow velocity of the air flow 20 is low. In a portion where the flow velocity of the air flow 20 is low, since the air volume is small, even if the size of the filter 32 is fine, the ventilation resistance does not increase significantly, the clogging progresses slowly, and the flow velocity of the air flow 20 is high. It is comparable to the filtration filter 31 located at the site.

B. The piping for surrounding the space 30 may be a piping for the heater core other than the piping for the evaporator 4.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of an air cleaning device of a vehicle air conditioner according to one embodiment of the present invention.

FIG. 2 is a structural explanatory view of an air purifying device of a vehicle air conditioner having a three-layer structure in which a filtration filter, an electrostatic filter, and an activated carbon filter are arranged (prior art).

FIG. 3 is a structural explanatory view of an air conditioning duct of a vehicle air conditioner (prior art).

[Explanation of symbols]

 A air purifier for vehicle air conditioner 1 air conditioning duct 2 blower 3 air purifier filter 4 evaporator (air conditioner heat exchanger) 20 air flow 31, 32 filtration filter 33 electrostatic filter 34 activated carbon filter

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B60H 3/06

Claims (3)

[Claims] 1. A vehicle in which a blower is disposed on the air inlet side of an air conditioning duct, an air purification filter is mounted downstream of the blower, and an air conditioning heat exchanger is provided downstream of the air purification filter. In the air cleaning device of the air conditioner, the air cleaning filter of the portion where the airflow velocity of the air conditioning duct is fast, has a three-layer structure in which a filtration filter, an electrostatic filter, and an activated carbon filter are arranged from the upstream side. The air purifying filter for a vehicle air conditioner, wherein the air purifying filter at a portion where the air flow velocity of the air conditioning duct is low has a two-layer structure in which a filtration filter and an activated carbon filter are arranged from the upstream side. apparatus. 2. The filter according to claim 1, wherein said filter is from 10 μm to 100 μm.
μm fine particles, and the electrostatic filter is 10 μm
The air purifying device for a vehicle air conditioner according to claim 1, wherein the activated carbon filter decomposes ozone by electrostatically adsorbing particles less than the particles. 3. The filter of the air-conditioning duct, which is located at a position where the flow rate of the air flow is low, is finer than the filter of the air-conditioning duct which is located at a position where the flow rate of the air flow is high. The air purifier of a vehicle air conditioner according to claim 1, wherein: