JPH04222615A - Air purifier - Google Patents

Abstract

PURPOSE:To prevent erroneous operation by stabilizing the detection due to the contamination sensor of an air purifier. CONSTITUTION:The contamination sensor 4 of an air purifier is provided at the position where the cross-sectional area of the passage of the filter receiving part 13 of a housing becomes large between a fan motor 2 and a filter 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an air cleaner for use in vehicles and homes.

0002

[Prior Art] Conventionally, there has been an air purifier that is equipped with a smoke sensor that detects dirt caused by cigarettes or dust, and operates a purifying blower motor depending on the dirt (for example, in Japanese Patent Laid-Open No. 6
No. 0-76419).

0003

[Problems to be Solved by the Invention] However, in this air purifier, the smoke sensor is installed near the air inlet or inside the ventilation duct, and the air contaminated with cigarette smoke etc. As a result, there is a problem that the smoke sensor exhibits a chattering state due to uneven air contamination passing through it, making the output signal unstable. In addition, the inlet and ventilation duct of an air purifier generally have a small cross-sectional area and the speed of the air being blown is several meters per second, which has the drawback of poor detection by smoke sensors, which can easily lead to malfunctions.

[0004] Accordingly, an object of the present invention is to provide a device that can stabilize detection and prevent malfunctions.

[0005]

[Means for Solving the Problems] The air cleaner of the present invention has a smoke sensor, and the dirt sensor is provided at a position between the fan motor and the filter where the cross-sectional area of the passage of the filter storage portion of the housing is large. It is something that

[0006]

According to the structure of the present invention, when the fan motor operates, dirty air is drawn from the suction port, purified by the suction filter, and then discharged to the outside from the discharge port. In this case, the dirty air is homogenized by the fan motor and flows to the dirt sensor, making detection stable. In addition, the dirt sensor is installed in a position where the cross-sectional area of the passage in the filter storage section is large.
The difference in sensitivity of the dirt sensor due to differences in wind speed is reduced, and malfunctions can be prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained with reference to FIGS. 1 and 2. That is, this air purifier includes a housing 1, a fan motor 2, a filter 3, and a dirt sensor 4. The housing 1 has an inlet 5 and an outlet 6. This housing 1 has a rectangular thin box shape with a semicircular end and consists of an upper case 7 and a lower case 8.
A suction port 5 is provided on one end side of the surface of the upper case 7, and a discharge port 6 is arranged in parallel on the other end side. 12 is a mounting rib.

The fan motor 2 is disposed inside the housing 1 on the suction port 5 side. In this embodiment, the fan 10 and the motor 11 are provided, and the motor 11 is installed with screws 9 at a position facing the suction port 5 of the lower case 8, and the fan 10 is located inside the suction port 5. The filter 3 is arranged on the discharge port 6 side of the fan motor 2. The embodiment uses a known filter material for removing cigarette smoke, dust, and odor gas, and is disposed inside the discharge port 6 so as to block the discharge port 6. 13 is a filter storage part of the housing 1;
14 is a ventilation wall.

The dirt sensor 4 is located inside the housing 1 and controls the fan motor 2 using the output signal of the dirt sensor 4.
The filter storage portion 13 is provided at a position where the passage cross-sectional area is large. The dirt sensor 4 is, for example, a known type such as a photoelectric type that emits light from a light emitting part (not shown) into dirty air and detects the scattered light with a light receiving part (not shown) to detect the concentration. Applicable. The motor 11 normally rotates at a low speed to suck in the air inside the car, and monitors it with the dirt sensor 4 inside the housing 1. When the dirt level of the air reaches a certain level or higher, the motor 1
1 rotates at high speed and purifies the inside of the car. In this case, by operating the motor 11 from low speed to high speed, the dirt sensor 4
2 when installed near the conventional suction port or inside the ventilation duct.
A wind speed difference of ~3 m/s occurs, but in this example, the cross-sectional area is approximately 10 times larger, so the wind speed difference is 0.2 to 0.3 m/s.
/second. Such a control circuit for the motor 11 using the dirt sensor 4 is composed of, for example, a comparator that compares the output signal of the dirt sensor 4 with a reference value, and a drive circuit that drives the motor based on the output signal of this comparator. .

0010

[Effects of the Invention] In the air purifier of the present invention, the dirt sensor is installed at a position where the passage cross-sectional area of the filter housing section of the housing is large between the fan motor and the filter, so that the dirty air is uniformized by the fan motor. Since the air flows through the dirt sensor, the detection becomes stable, and the difference in the sensitivity of the dirt sensor due to the difference in wind speed is reduced, so malfunctions can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the invention.

FIG. 2 is a partially cutaway plan view thereof.

[Explanation of symbols]

1 Housing 2 Fan motor 3 Filter 4 Dirt sensor 5 Suction port 6 Discharge port 13 Filter storage section

Claims (1)

[Claims] 1. A fan motor is disposed on the suction port side of a housing having a suction port and a discharge port, a filter is disposed on the discharge port side of the fan motor, and a dirt sensor is provided in the housing. In the air purifier in which the fan motor is controlled by the output signal of the dirt sensor, the dirt sensor is placed between the fan motor and the filter at a position where the passage cross-sectional area of the filter storage portion of the housing is large. An air purifier characterized by being positioned at.