JPH02154938A - Air conditioning plant with air cleaning function - Google Patents

Abstract

PURPOSE:To enable a comfortable air cleaning to be attained by a method wherein a smoke sensor, a detection circuit for detecting a smoke signal of the sensor and an air blowing switch operated in response to an output from the detection circuit are provided. CONSTITUTION:Although S1-1 and S1-2 are OFF, a compressor motor 2 and a fan motor 3 are stopped when the operation is stopped, as a cigar smoke is generated, a smoke sensor 4 detects a smoke and a resistance value RX of a detection resistance element is decreased down to a set value of a detection circuit 5, a contact point S2 becomes ON under an operation of the sensing circuit 5, the fan motor 3 is energized and then an air cleaning operation is started. As a gas concentration is decreased under an effect of air cleaning, S2 becomes OFF under an operation of the detection circuit 5 and the fan motor 5 is stopped. If the operating set of the detection circuit 5 is of a variation rate of 0.5, if it reaches a gas concentration of more than 3ppm, the air cleaning operation is carried out and then the operation is stopped at a value less than 3ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to operational control of an air conditioner with an air purifying function.

BACKGROUND OF THE INVENTION Conventionally, air conditioners with an air purifying function have been used, which are room air conditioners and package air conditioners with an air purifying device built into them, for the purpose of purifying the air from indoor dust and cigarette smoke.

Generally, the blowing function of an air conditioner is used to remove fine dust (dust with a diameter of 0.
A filter is installed at the air intake port of the air conditioner to collect 3-'1 μm), but the pressure loss of the filter is large, and the air flow rate of the air conditioner decreases, reducing heating and cooling performance. Many of them use an electrostatic precipitator method that has a high collection efficiency of small dust.

Problems to be Solved by the Invention However, the above configuration is designed to give priority to the function as an air conditioner, so when the heating and cooling operation is stopped, the blowing function also stops at the same time, and the air purifying function also stops.

Considering the use in a conference room, etc., during a conference, it functions as an air purifier as well as air conditioning, but when the operation is stopped at the end of the conference, some cigarette smoke remains and the odor remains.
If the layers overlap, there will be problems such as cigarette tar adhering to walls and staining them.

In addition, during the intermediate seasons (spring and autumn) when heating and cooling are not required, air purification is performed by blower operation, but after air purification, the blower is switched from [strong] to [weak] to reduce noise.
Alternatively, it is desirable to switch from blowing air to stopping. As the amount of cigarette smoke increases over time, it becomes necessary to switch from weak to strong air blowing or from stop to blowing air, which must be done manually.

The present invention solves the above problems and provides an air conditioner with an air purifying function that is capable of comfortable air cleaning.

Means for Solving the Problems In order to solve the above problems, an air conditioner with an air purifying function of the present invention includes a smoke sensor, a detection circuit that detects a smoke signal from the sensor, and an air blower operated by the output of the detection circuit. A switch will be installed for this purpose.

Effects With the above-described configuration, the present invention detects cigarette smoke in the room even when the operation is stopped, performs the blowing operation (air cleaning operation), and stops the blowing operation after cleaning the indoor air.

EXAMPLES Hereinafter, an air conditioner with an air purifying function according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an electric circuit of an air conditioner with an air purifying function according to the present invention. However, only the parts necessary for explanation are illustrated.

Figure 2 is a schematic diagram of the main parts and operating circuit of a semiconductor gas sensor, which is an example of a smoke sensor. FIG. 3 is a characteristic diagram of the smoke sensor.

In FIG. 1, 1 is a commercial power source, 2 is a compressor motor, 3 is a fan motor that drives a ventilation fan, and 51-
1, 51-2 is a driving switch that is linked to the driving operation; 4 is a smoke sensor; 6 is a detection circuit that detects the smoke signal from the smoke sensor and operates the contact; S2 operates as a blower switch by the output of the detection circuit 6. Indicates the contact point. S3 is a part of the operation mode changeover switch and is a switch for switching between air blowing and other modes.

Referring to FIG. 2, an outline of a semiconductor gas sensor used as a smoke sensor will be explained. A heater/electrode is provided at two locations on both ends of the metal oxide semiconductor (N-type semiconductor) that serves as the detection resistance element, and the heater voltage V is normally applied to the negative heater.
The detection resistance element is maintained at a constant temperature, connected in series with a load resistance (RL), and applied with a voltage (Vc).

In a clean atmosphere, an electron-deficient layer is formed in an N-type semiconductor due to oxygen (an electron-absorptive gas), and it exhibits a high resistance value, but the principle that the resistance value decreases when a reducing gas (such as H2) is introduced is applied. In the example of FIG. 2, a decrease in the resistance value Rx of the detection resistor element is read from a change in the voltage (EL) of the load resistor RL.

In Fig. 3, the resistance change rate when the resistance value Rx in clean air is 1 is 0.7°10 ppm at a gas concentration of 3 ppm (equivalent to the gas concentration of one cigarette in a 6-tatami room).
It is about 0.5 in m.

The operation of the air conditioner with an air purifying function configured as described above will be described below.

During the cooling/heating operation, the operation switches 51-1, 5l-2j and the ventilation/cooling/heating changeover switch S3 are turned on, and the compressor morph 2 and fan motor 3KMt are activated. During ventilation operation, S S is ON, 531-1' 1
-2 is OFF and only the fan motor 3 is energized. In either case, the fan motor 3 performs an air blowing operation in an operating state and performs an air purifying operation.

When operation is stopped, 1-1' 1-2 is OFF, and both compressor motor 2 and fan motor 3 are stopped, but
When cigarette smoke is generated, the smoke sensor 4 detects the smoke, and the resistance value RX of the detection resistor element decreases to the set value of the detection circuit 6, the contact S2 is turned ON by the operation of the detection circuit 6, and the fan motor 3 is turned on. Turn on the power and start air purification operation. When the gas concentration decreases due to the air cleaning effect, S2 is turned off by the operation of the detection circuit 6, and the fan motor 3 is stopped.

If the operation setting of the detection circuit 6 is set as the rate of change of Rx 0.6, then 3
When the gas concentration reaches ppm or higher, air cleaning operation is performed.
Operation will be stopped if the concentration is below 3 ppm.

Effects of the Invention As described above, the present invention makes maximum use of the air purifying function of an air conditioner with an air purifying function, and can automatically purify indoor air even during the intermediate period when heating and cooling is not performed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of an electric circuit of an air conditioner with an air purifying function in an embodiment of the present invention, Fig. 2 is a schematic diagram showing the configuration of a smoke sensor, and Fig. 3 is the operating circuit of Fig. 2. figure,
FIG. 1 is a characteristic diagram of a smoke sensor. 1... Commercial power supply, 2... Compressor motor, 3... Fan motor, 4...;
Smoke sensor, 6...detection circuit, S2...
- Detection circuit contacts, 51-1, 51-2...operation switch, S3...ventilation/cooling/heating changeover switch. Name of agent Patent attorney Shigetaka Awano and one other person II Figure 1 ・- -1 -1- St -m- 51-1, S +-t - 53-・- 1l! The power supply for the compressor motor F'7 is also the long point of the road + the detection circuit Hinoki C] the long point l of the road 'Inui Sui No + Michiho/Ku Seirang ω Circulation Sui 9 壬

Claims (1)

[Claims] It is equipped with an operation mode selector switch (cooling, heating, ventilation), an operation switch, a smoke sensor, a detection circuit that detects the smoke signal from the smoke sensor, and a ventilation switch that is activated by the output of the detection circuit. An air conditioner with an air purifying function is characterized in that it starts blowing operation when it detects cigarette smoke or dirt in the air in a room, and after cleaning the air, stops blowing operation when a smoke signal turns OFF.