JPH03140739A - Air conditioner with gas and dust detector - Google Patents

Abstract

PURPOSE:To detect powder dust and gas with a single device by a method wherein a near infra-red ray interference filter is fixed before an infra-red ray sensing device, a far-infra red ray region interference filter for passing only the far-infra red ray of gas and a hot mirror for passing the near-infra red ray region and a visible region and reflecting the far infra-red ray region are combined to each other. CONSTITUTION:A sensor device is arranged within a suction port of an indoor device of an air conditioner. An infra-red ray generating device 21 may generate a near infra-red ray with a wave-length of 940nm, for example. An infra-red ray receiving device case 22 is comprised of an infra-red ray receiving device 23 for converting an infra-red ray dose into a voltage, a near infra-red ray interference filter 24 for passing a wave-length of only the near infra-red ray region, a far infra-red ray region interference filter 25 for passing only a wave-length of a far infra-red ray (for example, a wave-length of carbon dioxide gas), and a hot mirror for reflecting a far infra-red ray from the far infra-red ray filter 25, passing the near infra-red ray from the near infra-red ray generating device 20 and inputting it into the light receiving device 23. With such an arrangement, the infra-red ray generating device generate a light, the near infra-red ray passes through the near infra-red ray filter 24 and the hot mirror 26. When the ray is not generated, the far infra-red ray passed through the filter 25 is reflected back by the mirror 26 ans is incident to each of the light receiving devices 23.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner equipped with a detection device for detecting indoor gas and dust.

Prior Art The prior art will be explained using FIG. 9. Figure 9 shows
FIG. 1 is a configuration diagram of a dust detection device used for air conditioners, vehicles, etc. 1 is the dust detection device body, 2 is a sensor case, 3 is an infrared generator that generates infrared rays, 4 is an infrared detector that can detect the amount of infrared rays, and 5 is dust, which is an impurity component contained in the air. A dust control circuit 6 is connected to the infrared generator 3 and the infrared uI device 4. 7 is Vout, which outputs the change in voltage with respect to the amount of dust.

The operation of the dust detection device configured as above will be explained below.

The dust control circuit 6t] When the infrared rays are generated from the infrared rays generator 3, the infrared rays are incident on the infrared rays detector 4 along the optical path indicated by the arrow. Therefore, when the dust 5 enters between the infrared ray generating device 3 and the infrared receiving device, the amount of infrared rays reaching the infrared receiving device 4 is reduced by the dust 5, and the voltage of Vout 7 is reduced. Therefore, an operation is performed in which the voltage changes with respect to the amount of dust 5 (for example, Japanese Patent Laid-Open No. 59-79840).

Problems to be Solved by the Invention However, with this configuration, the infrared detector reacts to infrared rays other than the infrared generator, resulting in poor dust detection accuracy.
When detecting gas (hereinafter referred to as gas), a separate gas detection device is required, which poses problems such as price and installation space.

In view of the above drawbacks, the present invention installs a near-infrared interference filter in front of the infrared detection device so as not to react to near-infrared rays other than the infrared ray generator, suppresses the influence of disturbances on infrared rays, and also suppresses the influence of disturbances on infrared rays. We provide a gas and dust detection device that can detect dust and gas with a single infrared detection device by combining a far-infrared interference filter that transmits the light and a hot mirror that transmits the near-infrared and visible regions and reflects the far-infrared region. The purpose is to

Means for Solving the Problems To achieve this object, the gas/dust detection device of the present invention emits near-infrared rays of a specific wavelength from an indoor unit of an air conditioner main body and a suction port of the indoor unit. an infrared light emitting device that converts the amount of infrared rays into a voltage value, a near infrared interference filter that transmits only the near infrared region of a specific wavelength, transmits the near infrared region and visible vA, and reflects the far infrared region. It is equipped with a hot mirror that transmits a specific wavelength of far-infrared rays, and a far-infrared interference filter that transmits far-infrared rays of a specific wavelength.

Effects of the present invention With the above-described configuration, when the infrared light emitting device emits near infrared light, the near infrared light passes through the near infrared interference filter and the hot mirror, and the infrared detection device converts the amount of near infrared 1J into a voltage. When the infrared emitting device is not emitting light, the far infrared rays that have passed through the far infrared interference filter are reflected by the hot mirror, and the infrared detector outputs the amount of far infrared rays at a specific wavelength in the air as a voltage. Therefore, dust that blocks infrared rays and gas that absorbs wavelengths in the far infrared region can be detected as changes in voltage using a single infrared detection device, and the cost and installation of the dust/gas detection device minimizes space. It also ensures reliability that is not affected by infrared disturbances.

Embodiment Regarding a gas/dust detection device according to an embodiment of the present invention,
This will be explained with reference to the drawings. Figure 1 is an installation diagram of the indoor unit in the room. FIG. 2 is an installation diagram of the gas/dust detection device of the present invention. FIG. 3 is a configuration diagram of the gas/dust detection device of the present invention. FIG. 4 is a control circuit diagram of the gas/dust detection device of the present invention. FIG. 5 is a control flowchart when the SW is turned off.

FIG. 6 is a control flowchart when the SW neon is on.

FIG. 7 is a characteristic diagram of the amount of gas (ppm) and the output voltage Vout7. Further, FIG. 8 is a characteristic diagram of the amount of dust (CPM) and the output voltage Vout7. It should be noted that components having the same configuration as the conventional configuration are indicated by the same numbers and detailed explanations are omitted.

In FIG. 1, reference numeral 8 denotes an indoor unit of a ceiling-embedded air conditioner, and the lower surface of the indoor unit 8 is opened on the same plane as the ceiling 9. The room 10 has a ceiling 9, side walls 11.12. and floor 8
14 is a suction port of the indoor unit 8. In FIG. 2, 15 is a blower casing inside the suction port of the indoor unit 8. Reference numeral 16 denotes a gas/dust detection device, which is fixed to the blower casing 15 with screws 17 and 18. 19 also removes gas and dust from the air.
This is a window that leads into the inside of the dust detection device.

FIG. 3 is a configuration diagram of the gas/dust detection device, and 20 is an infrared ray generator casing, which is composed of an infrared ray generator 21 that generates near-infrared rays with a wavelength of 940 nm.

22 is an infrared receiver case, which includes an infrared receiver 23 that converts the amount of infrared rays into voltage, a near-infrared interference filter 24 that transmits wavelengths only in the near-infrared region (940 nm), and far-infrared rays (4° 1 μs to 4.5 μs). a far-infrared interference filter 25 that transmits only the wavelength of carbon dioxide (the wavelength of carbon dioxide gas);
The hot mirror 26 is installed in front of the infrared ray generator 20 and reflects the near infrared rays from the near infrared ray generator 20 to the infrared ray receiver 23 . 27 is a gas/dust control device that includes LA and LK of the infrared generator 21, SL of the infrared receiver 23, S2. S3 is connected.

It also has a Vout7 terminal from which voltage is output.

FIG. 4 is a circuit diagram of the gas/dust side, and 28 is the internal circuit of the gas/dust control device 27.
S with an amplifier that amplifies the output voltage of 3 and outputs it from
t, S2. S3 is connected. Reference numeral 29 denotes a main town area, which receives the signal from the amplifier 28 through an A/D terminal for converting analog to digital, LA and LK terminals for controlling the infrared light emitting device 21, and is pulled up by a resistor 30. , a SW 31 for switching gas/dust detection, and a memory 32 for temporarily storing the voltage of the A/D terminal.
The operation of the gas/dust detection device configured as above 0, which is composed of Vout 7 that outputs the detection result as a voltage, will be explained below using Figs. 5, 6, 7, and 8. explain.

In step 1 of FIG. 5, the SW 31 signal causes the SW
If it is on, the process branches to step 2, and if it is off, the process branches to step 9. Below, steps 2 to 8 will explain the dust detection procedure. In step 2, in order to operate the infrared ray generator 21, LA is set to 'H', and LK is set to 'II L'.
Each signal of II is output and operated to generate near infrared rays.The generated near infrared rays are passed through the near infrared interference filter 24.
And, the hot mirror 26 is transmitted like the arrow of the cabinet,
The infrared light receiving device 23 is reached. The infrared receiving device 23 outputs voltages at Sl and S2 depending on the amount of infrared rays incident thereon. In step 3, the voltages of Sl and S2 are amplified by the amplifier and input to the A/Di terminal of the main town area. In step 4, the voltage input from the A/D terminal is temporarily stored in the memory 32. In step 5, 'L' is applied to LA in order to stop the infrared generating device 20.
Output each H” signal to LK and stop it. Step 6
Now, in step 7, the output voltages Sl and S2 of the infrared receiving device 23 when no near infrared rays are incident are amplified by the amplifier 28 and taken into the A/D terminal. In step 7, the voltages stored in the memory 32 in step 4 are Calculate the voltage difference between the input voltage and the current input voltage. In step 8, the calculated voltage difference is output from the Vout 7m element. The voltage characteristics at that time are shown in FIG. 7, where the horizontal axis represents the amount of dust 5 in CPM (ICPM is O, O1 mg/m3). The vertical axis is Vout7. As CPM increases, Vout7 decreases in a quadratic linear manner, and the output voltage shown in FIG. 7 is outputted with respect to the amount of dust 5.

Next, the gas detection procedure will be explained in steps 9 to 11 of FIG. In step 9, when the same operation as in step 5 is performed, the wavelength of the far-infrared rays of the gas transmitted by the far-infrared band interference filter 25 is reflected by the hot mirror 26 as shown in the optical path of the arrow on the top, and the infrared rays are The light enters the light receiving device 23. In step 10, by performing the same operation as in step 6, the amount of far infrared rays can be manually applied as a voltage to the A/Di element. In step 11, the input voltage at the A/D terminal is output from Vout7. The voltage characteristics at that time are shown in FIG. 8, where the horizontal axis represents the amount of gas in ppm. The vertical axis is V out 7
voltage. Vout7 becomes 2 as PPM increases.
The output voltage shown in FIG. 8 is outputted with respect to the amount of gas by decreasing linearly.

As described above, according to this embodiment, when the infrared light emitting device emits near infrared rays, the near infrared rays pass through the near infrared interference filter and the hot mirror, and the infrared detection device outputs the amount of near infrared rays as a voltage, In addition, when the infrared emitting device is not emitting light, the far infrared rays that have passed through the far infrared interference filter are reflected on the hot mirror, and the infrared detector outputs the amount of far infrared rays at a specific wavelength in the air as a voltage. A single infrared detection device can detect dust that blocks light and gas that absorbs wavelengths in the far infrared region as changes in voltage. Ensures reliability unaffected by infrared rays.

Effects of the Invention As described above, the temperature detection device of the present invention includes an indoor unit of an air conditioner main body, an infrared light emitting device that emits near infrared rays of a specific wavelength, which is provided at the intake port of the indoor unit, and an infrared light emitting device that emits near infrared rays of a specific wavelength. An infrared detection device that converts into a voltage value, a near-infrared interference filter that transmits only the near-infrared region of a specific wavelength, a hot mirror that transmits the near-infrared region and visible region, and reflects the far-infrared region, Since it is equipped with a far-infrared interference filter that transmits infrared rays, when the infrared light emitting device emits near-infrared rays, the near-infrared rays pass through the near-infrared interference filter and the hot mirror, and the infrared IJ [closer to the detection device] Infrared ITR: Output as a voltage, and when the infrared light emitting device is not emitting light, the far infrared rays that have passed through the far infrared interference filter are reflected by the hot mirror, and the far infrared rays of a specific wavelength in the air are detected by the infrared detector. Since the dust that blocks infrared rays and the gas that absorbs wavelengths in the far-infrared region can be detected as changes in voltage using a single infrared detector, the price and installation space of the dust/gas detector can be reduced. This ensures reliability that is not affected by infrared disturbances. Its practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the installed state of the indoor unit in a room showing one implementation of cooling of the present invention, FIG. 2 is a cross-sectional view of the gas/powder H detection section of the present invention, and FIG. A block diagram of the dust detection device, FIG. 4 is a control circuit diagram of the gas/dust detection device of the present invention, FIG. 5 is a control flowchart when the switch is off, FIG. 6 is a control flowchart when the switch is on, and FIG. Dust concentration (
CPM) and output voltage Vout7, FIG. 8 is a characteristic diagram of gas concentration (ppm) and output voltage Vout7, and FIG. 9 is a configuration diagram of a conventional dust detection device. 8...Indoor unit, 14...Suction port,
21...Mouth...Infrared light emitting device, 23...Infrared light receiving device, 24...Near infrared band interference filter, 2
5...Eye...Far-infrared interference filter, 26...
Hot mirror 27...Gas/dust control device,
28... Amplifying device, 29... Main control unit.

Claims (1)

[Claims] An indoor unit of the air conditioner main body, an infrared light emitting device that emits near infrared rays of a specific wavelength, which is installed at the intake port of the indoor unit, an infrared detection device that converts the amount of infrared rays into a voltage value, and an infrared ray detector that emits near infrared rays of a specific wavelength, and an infrared light emitting device that emits near infrared rays of a specific wavelength. It consists of a near-infrared interference filter that transmits only the outer region, a hot mirror that transmits the near-infrared and visible regions and reflects the far-infrared region, and a far-infrared interference filter that transmits the far-infrared rays of a specific wavelength. When the device emits near-infrared rays, the near-infrared rays pass through the near-infrared interference filter and the hot mirror, and the infrared detection device outputs the amount of near-infrared rays as a voltage, and the infrared light-emitting device does not emit light. In this case, the far infrared rays that have passed through the far infrared band interference filter are reflected by the hot mirror, and the amount of far infrared rays at a specific wavelength in the air is output as a voltage from the infrared detection device. Air conditioner equipped with a detection device.