JPS63313049A - Gas alarm device - Google Patents

Abstract

PURPOSE:To enable the common use of the titled device for detection of various kinds of gases by constituting the device in such a manner that the electric power from a charger is converted by a power supply circuit to the voltage suitable for a gas sensor and processing circuit. CONSTITUTION:The electric power from the charger 20 is converted by the power supply circuit 22 to the voltages suitable for the gas sensor 24 and the processing circuit 26 and such voltages are respectively supplied thereto. The circuit 26 receives the detection output from the sensor 24, compares the discrepancies of the detection output value from the plural reference values provided in said circuit and passes electric current to an LED 30 so that the LED emits light according to the results thereof. A switch 12 to be operated at the time of changing the kind of the gas to be detected is connected to the circuit 26. Whether the switch 1 is operated to the side for detecting gaseous CO or the side for detecting gaseous alcohol is judged by this circuit. Furthermore, the circuit makes the comparison processing by shifting the levels of the plural reference values or attenuating or amplifying the detection output of the sensor 24 according to the operating condition of the switch 12. The detection of the gas concn. is thus executed with one unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a gas alarm device having a reducing gas detection section that generates a detection output according to the type and amount of adsorbed reducing gas.

(Prior Art) Conventionally, various devices have been provided as gas alarm devices. For example, gas alarm devices for home use include alarms for city gas, propane gas, etc. that are installed near gas appliances in the kitchen, and alarms that are built into oil gas heaters and the like to detect CO levels.

Furthermore, in environments where various gases are used in business, it is common to have various alarms depending on the type of gas used as a safety measure.

On the other hand, a special gas detector has been proposed that detects the alcohol concentration in exhaled breath and objectively determines the presence of the person seated next to the person.

(Problems to be Solved by the Invention) However, even with the gas alarm device as described above, it is still not sufficient and has the following problems.

As described above, the various gas alarm devices conventionally used detect a specific gas depending on the purpose of use and are fixed at a specific position. The gas detector that detects the alcohol concentration in exhaled breath is no exception, and the only gas to be detected is alcohol in exhaled breath.

However, the need to detect gas frequently occurs in daily life, and the types of gases to be detected are not constant. Conventional gas alarm devices have been developed with emphasis on detection accuracy without considering ease of handling or economic efficiency. This required the use of multiple gas alarm devices depending on the type of gas, which was extremely inconvenient.

The present invention has been made to solve the above problems,
The purpose of this invention is to provide a gas alarm device that can be used for various gas detections and is easy to handle and economical.

Structure of the invention (means for solving the problems) The means configured by the present invention to solve the above problems are as follows:
When a reducing gas is adsorbed, it has a reducing gas detection section that generates a detection output according to the type and amount of adsorbed reducing gas, and the detection output of the reducing gas detection section is processed by a processing circuit. In the gas alarm device, the processing circuit sets a detection output when a predetermined reducing gas harmful to the human body is adsorbed to the reducing gas detection unit at a concentration that affects the human body as a determination level, and detects harmful a harmful gas alarm unit that notifies the concentration of the reducing gas; switching a determination level of the harmful gas alarm unit; and determining a detection output when alcohol gas is adsorbed at a predetermined concentration in the reducing gas detection unit; The gist thereof is a gas alarm device characterized by comprising: a judgment level switching unit that notifies the concentration of alcohol/gas;

(Function) In the gas alarm device of the present invention, the harmful gas alarm section detects when a predetermined reducing gas that is harmful to the human body is adsorbed to the reducing gas detection section at a concentration that affects the human body. has the detection output as the judgment level. Then, the detection output of the reducing gas detection section is compared with the determination level to determine whether to issue notifications. Note that the harmful gas notification unit is not limited to one type of determination level, and may have a plurality of determination levels in order to notify the concentration of harmful gas in detail, and perform notification according to the comparison.

The determination level switching unit has the function of switching the determination level of the harmful gas notification unit to a detection output when alcohol gas is adsorbed at a predetermined concentration in the reducing gas detection unit. Therefore, by activating the determination level switching section, it becomes possible to notify the concentration of alcohol gas instead of the concentration of harmful gas. Note that when the harmful gas notification section has a plurality of determination levels, by changing each determination level, it is possible to notify the concentration of alcohol gas in detail in the same manner as described above.

EXAMPLES Hereinafter, in order to explain the present invention more specifically, examples will be given and explained.

(Example) FIG. 1 is a six-sided view for explaining the appearance of a gas alarm device according to an example. As shown in the figure, the gas alarm device of this embodiment has a thin card-like appearance and is highly portable.

As shown in the plan view, a display section 4 for displaying the concentration of detected gas is installed in the center of a front case 2 of the gas alarm device. The many vertical lines drawn on the display section 4 are scale lines that indicate the concentration of detected gas, with numbers indicating the concentration at the time of carbon monoxide (CO) detection at the top, and numbers at the bottom. has a numerical value indicating the concentration at the time of alcohol/gas detection. Display on the display unit 4 is performed by light emitting diodes (hereinafter referred to as LEDs) peeking through small holes drilled on each of the scale lines, and as described later, along the scale line where one lit LED is arranged. The concentration can be known by referring to the numerical value indicating the concentration. Moreover, in order to be able to recognize the high and low concentrations by looking at the LEDs, the LEDs indicating higher temperatures are arranged so as to be located higher on the scale line. Further above the display section 4, a circular detection hole 6 is bored in the front case 2, into which a mesh 8 is fitted to allow gas in the atmosphere to flow into the built-in gas sensor and to protect the gas sensor. has been done.

There are two slide switches 1 on the left side of the gas alarm device.
0.12 is provided. The switch 10 is a power switch of the gas alarm device, and is used to activate/stop the gas detection function. The other switch 12 is used to switch the gas to be detected, and is operated in this embodiment to detect two types of gas: CO and gas in alcohol.

Furthermore, when the gas alarm device is attached to the charging adapter 16, the power supply terminal protruding from the charging adapter 16 is inserted into the joint portion 14 provided on the front side of the gas alarm device, as shown in FIG. Together, they serve as the power supply port for the gas alarm device.

The charging adapter 16 is a known rectifier circuit that receives power from a commercial power source through an outlet, converts this power into DC constant voltage power suitable for operating the gas alarm device, and outputs it to the power supply terminal. It is equipped with a smoothing circuit and a constant voltage circuit.

FIG. 3 is a block diagram showing the electric circuit built into the gas alarm device having the above-mentioned appearance.

As shown in the figure, the gas alarm device has a built-in charger 20, and when the power switch 10 is turned on, electric power is supplied from the charger 20 to operate various electronic components, which will be described later. Further, the human power section of the charger 20 is connected to the joint section 14, and can be charged while the gas alarm device is attached to the charging adapter 16. Electric power from the charger 20 is converted by a power supply circuit 22 into a voltage suitable for the gas sensor 24 and the processing circuit 26, and is supplied to each of the gas sensor 24 and the processing circuit 26. The gas sensor 24 is constituted by a known hot-wire type semiconductor sensor disposed inside the detection hole 6, and detects a change in electrical resistance due to attachment of reducing scum using a bridge circuit. FIG. 4 is an output characteristic diagram showing the detection characteristics of this gas sensor 24. As is clear from the characteristic diagram, the gas sensor 24 produces an output depending on the type and amount of attached gas, but both of the characteristics exhibit the same change, and the output level is simply shifted. In the example shown in FIG. 4, if the level of the alcohol/gas detection result is lowered at a constant rate, it will match the CO detection level.

The processing circuit 26 receives the detection output of the gas sensor 24, compares the detection output (directly) with a plurality of internal comparison reference values, and, depending on the result, compares the detection output with a plurality of internal comparison reference values. The switch 12, which is operated when changing the type of gas to be detected, is connected to the processing circuit 26, and the switch 12 is connected to the side that detects CO or alcohol gas. The processing circuit 26 shifts the first shift of the plurality of comparison standards, or attenuates or amplifies the detection output of the gas sensor 24, depending on the operating state of the switch 12. , executes the comparison process. That is, as described above, the output characteristics of the gas sensor 24 show a characteristic in which the output shifts at a constant rate depending on the type of gas to be detected (attached gas). Therefore, the processing circuit The function of 26 is that the concentration can be easily detected by shifting the level of the comparison standard value or the detection output without preparing a comparison standard value for each gas to be detected.
In this case, a display corresponding to the gas concentration, which is the result of the gas sensor 24 detecting the type of gas selected by the switch 12, is executed.

Note that the comparison reference value set inside the processing circuit 26 and the switching of the gas detection sensitivity changed by the switch 12 are based on CO2 in the air, which has an effect on the human body, and a human can make an accurate judgment. Display part 1 shows the concentration of alcohol and gas contained in exhaled breath when the acidity reaches a level that cannot be lowered instantly.
The display range is set in advance to be 4.

The gas alarm device of the embodiment configured as described above has the following effects.

First, by skillfully utilizing the fact that the output characteristics depending on the type of gas detected by the gas sensor 24 change as if by simply shifting the level, the comparison reference value or the level of the detection output of the gas sensor 24 is sent to the processing circuit 26. By simply adding a shift function, it is possible to detect the concentrations of multiple gases. Therefore, it becomes a useful gas alarm device capable of detecting a plurality of gases, although it is extremely compact and lightweight, and has an excellent handleability and portability. Furthermore, since a plurality of gas concentration detections are achieved using many common parts, the gas alarm device is highly economical and inexpensive.

In this embodiment, the comparison reference value set inside the processing circuit 26 and the switching of the gas detection sensitivity changed by the switch 12 are based on the concentration of CO in the air, which has an effect on the human body, and accurate human judgment. The display range of the display unit 14 is set in advance to be the concentration of alcohol and gas contained in exhaled breath when the person is seated next to the person who cannot instantly lower the pressure.

Therefore, if it is installed in a car and used, it will reduce air pollution due to increased CO2 generated by air conditioning that recirculates the air inside the car, and reduce the ability of the driver to make the instantaneous judgments necessary to drive the car. It becomes possible to objectively measure the number of seats next to each other, and two types of gas concentration measurements required when using a car can be achieved with one gas alarm device.

Effects of the Invention As described in detail with reference to embodiments, the gas alarm device of the present invention can be used in conjunction with various gas detections, and has excellent effects in terms of ease of handling and economy.

Therefore, the gas concentration detection required in daily life can be done in one go.
This can be done on a stand, making it an extremely useful gas alarm device.

[Brief explanation of drawings]

Fig. 1 is a six-sided external view of the gas alarm device of the embodiment, Fig. 2 is a side view of a charging adapter for charging the gas alarm device of the embodiment, and Fig. 3 is an electrical diagram of the gas alarm wt device of the embodiment. A circuit block diagram and FIG. 4 show an output characteristic diagram of a gas sensor used in the gas alarm device of the same embodiment.

Claims (1)

[Scope of Claims] A reducing gas detection unit that generates a detection output according to the type and amount of adsorbed reducing gas when the reducing gas is adsorbed, and the detection output of the reducing gas detection unit is In the gas alarm device that is processed and notified by a processing circuit, the processing circuit sends a detection output to the reducing gas detection unit when a predetermined reducing gas harmful to the human body is adsorbed at a concentration that affects the human body. As a judgment level, a harmful gas alarm unit notifies the concentration of harmful reducing gas, and the judgment level of the harmful gas alarm unit is switched to detect when alcohol gas is adsorbed at a predetermined concentration to the reducing gas detection unit. A gas alarm device comprising: a determination level switching section that determines the output and notifies the concentration of alcohol/gas.