JP2018097511A - Gas leakage detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas leakage detection device capable of preventing an alarm sound setting change caused by an erroneous operation during periodic inspection, operations carried out by an unspecified number of people and the like.SOLUTION: Switching of alarm sound setting is set to be performed only when a power source is turned on, specifically only at a time when a switch provided in a gas leakage detection device when the power source is turned on is in an on-state. When the alarm sound setting is effectively switched, a confirmation sound announcing that the alarm sound setting is valid rings from a buzzer, and effectiveness/ineffectiveness of the alarm sound setting is written in an EEPROM.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas leak detector, and more particularly, to a gas leak detector that is configured to switch between valid and invalid generation of an alarm sound when a gas leak is detected.

  As a conventional technology for this type of gas leak detector, for example, in order to prevent an alarm sound from being generated during regular inspections at a store in a store, an alarm sound (signal sound or sound) is operated when a dedicated alarm stop switch is operated. ) Is known (for example, see Patent Document 1 below).

JP 59-008097 A

  However, in the conventional gas leak detector as described above, the setting of the alarm sound (setting to sound) / invalid (setting not to sound) (hereinafter referred to as alarm sound setting) can be easily switched by operating the switch. For example, there has been a problem that the alarm sound setting is changed due to an erroneous operation at the time of periodic inspection or an operation by an unspecified number of people when installed in a store or the like.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a gas that can prevent an alarm sound from being changed due to an erroneous operation during periodic inspection or an operation by an unspecified number of people. It is to provide a leak detector.

  In order to solve the above-mentioned problem, the gas leak detector according to the present invention is a gas leak detector capable of switching alarm sound settings relating to the validity and invalidity of alarm sound generation, and switching the alarm sound settings only when the power is turned on. It is characterized by the fact that is performed.

  In a preferred aspect, the alarm sound setting is switched only when an input signal input from an input unit provided in the gas leak detector is in a predetermined state when the power is turned on.

  In a further preferred aspect, the input unit is used for inputting a signal other than switching the alarm sound setting during operation after power-on.

  In another preferred embodiment, the alarm sound setting is notified based on whether or not the alarm sound is generated when the power is turned on.

  In a further preferred aspect, when the warning sound setting is valid, the warning sound is generated when the power is turned on, and when the warning sound setting is invalid, the warning sound is not generated when the power is turned on. It has become.

  In another preferred embodiment, the alarm sound setting is stored in a storage unit provided in the gas leak detector, and when power is restored after the power is turned off, before power recovery stored in the storage unit. The alarm sound setting is read and restarted.

  In another preferred embodiment, the alarm sound setting is notified by a difference between lighting and blinking of a light source provided in the gas leak detector, a difference in blinking cycle, or a difference in color.

  According to the gas leak detector according to the present invention, the alarm sound setting for enabling / disabling the alarm sound is switched only when the power is turned on, particularly provided in the gas leak detector when the power is turned on. Since the alarm sound setting is switched only when the input signal input from the input unit is in a predetermined state, the alarm sound setting is not easily switched, and during periodic inspections. It is possible to reliably prevent the alarm sound setting from being changed due to an erroneous operation or an operation by an unspecified number of people.

  The input unit can be used for a predetermined function of the gas leak detector (for example, a function of interrupting the generated alarm sound) other than the function of switching the alarm sound setting during operation after power-on. Therefore, the alarm sound setting can be switched without requiring a dedicated switch as described in Patent Document 1, and the number of parts can be reduced and the cost can be reduced.

  Further, the alarm sound setting is notified by using at least one of the presence / absence of the alarm sound at power-on, the difference between lighting and blinking of the light source, the difference in blinking period, and the difference in color. Therefore, an operator or a user who handles the gas leak detector can easily grasp the alarm sound setting (state).

It is a circuit diagram of one embodiment of a gas leak detector concerning the present invention. It is a flowchart which shows the operation | movement at the time of power activation of the gas leak detector shown by FIG. It is a flowchart which shows the operation | movement of the lighting pattern selection of the light source for power supply display of the gas leak detector shown by FIG. It is a flowchart which shows the operation | movement of the alarm sound at the time of the alarm of the gas leak detector shown by FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

<Configuration of gas leak detector>
FIG. 1 shows a circuit diagram of an embodiment of a gas leak detector according to the present invention.
As shown in FIG. 1, the gas leak detector 1 includes a gas sensor 10 for detecting the concentration (gas leak) of a detection gas from the atmosphere, and a switch 20 as an input unit for operation of an operator or a user. , A buzzer 30 as an alarm sound generation unit for generating an alarm sound at the time of alarm, a light source 40 for power display and a light source 41 for alarm display as a display unit composed of LED lights, etc., an output for outputting the alarm to the outside A relay 50 as a unit is provided, and a microcomputer 60 as a control unit for controlling them is mounted. Although not shown, the gas leak detector 1 is provided with a power-on unit (for example, an outlet or a power-on switch) for supplying power to the gas leak detector 1 (turning on the power). ing.

  The microcomputer 60 includes an input / output port (I / O) 61 necessary for input / output of signals to / from peripheral circuits, an A / D converter 62 for reading voltage, and a nonvolatile storage unit for storing alarm sound settings and the like. An EEPROM 63, a timer 64 for measuring the time for interrupt processing, a ROM 66 for storing programs, a CPU 67 for executing programs and arithmetic processing stored in the ROM 66, a RAM 65 for temporarily storing data necessary for program execution, and the like Is provided.

  The A / D converter 62 of the microcomputer 60 is connected to the output voltage of the gas sensor 10, and the output port of the input / output port (I / O) 61 is a buzzer 30, a power source light source 40, and an alarm display. A light source 41 and a relay 50 are connected, and a switch 20 is connected to an input port of an input / output port (I / O) 61.

  Here, the switch 20 is used as the input unit, the buzzer 30 is used as the alarm sound generation unit, the light source 40 and the alarm display light source 41 are used as the display unit, and the relay 50 is used as the output unit. Other means may be used.

  That is, the microcomputer 60 has a function of receiving an input signal input from the switch 20, a function of controlling the buzzer 30 to generate (sound) and mute an alarm sound, a power display light source 40, and an alarm display light source 41. And a function for switching the alarm sound regarding the validity / invalidity of the alarm sound generation, and the like.

  In addition, the switch 20 is assigned a function for starting a test and interrupting a buzzer during an operation after the power is turned on, and a function for switching an alarm sound setting only when the power is turned on (details later). Description). The switch 20 may be, for example, a push button type switch that is in an ON state only while the switch is being pressed.

  The microcomputer 60 turns on or blinks the power display light source 40 when the power is turned on via a power supply unit (not shown). By turning on or flashing the power source light source 40, for example, when it is lit, a setting is made to sound an alarm sound when an alarm is activated (the alarm sound setting is valid). The operator or the user is notified that the setting is not performed (the alarm sound setting is invalid). Also, change the color when the power display light source 40 is turned on, for example, the warning sound setting is valid for green and the warning sound setting is invalid for orange, so that the operator or user is notified. Also good.

  On the other hand, when the microcomputer 60 that has started monitoring the output voltage of the gas sensor 10 after turning on the power is judged to be a gas leak or a malfunction of the device, the alarm display light source 41 is turned on or blinks, the output of the relay 50 is used. Alarm.

  As for the buzzer 30, the microcomputer 60 is operated according to the alarm sound setting (state) (detailed later).

  Note that the gas leak detector 1 of the present embodiment is not limited to the circuit configuration described above, and may be any configuration as long as the circuit configuration can implement the present invention.

<Operation of gas leak detector>
<Operation at power-on>
Next, an operation when the gas leak detector 1 is turned on, specifically, a method of switching between valid / invalid of alarm sound setting will be described based on the flowchart shown in FIG.

  When the power is turned on via a power-on unit (not shown) (step S1), the microcomputer 60 reads the alarm sound setting from the EEPROM 63 (step S2). The alarm sound setting read here is the alarm sound setting immediately before the current power recovery stored in the EEPROM 63 at the time when the power was previously turned off or when the power was turned off due to a power failure or the like. If the read alarm sound setting is valid (sound setting) (step S3: Yes), then the ON / OFF state of the switch 20 (the state of the input signal input from the switch 20) is read (step S4). . When the switch 20 is in an OFF state (step S5: No), a confirmation sound for notifying that the alarm sound setting is valid (in this example, the same sound as the alarm sound) is sounded from the buzzer 30 (step S6). The process is terminated. On the other hand, when the switch 20 is in the ON state (step S5: Yes), the alarm sound setting is changed from valid to invalid (setting not to sound) (step S7), and the alarm sound setting is written as invalid in the EEPROM 63 (step S8). ), The process is terminated. At this time, a confirmation sound (alarm sound) is not emitted from the buzzer 30.

  On the other hand, when the read alarm sound setting is invalid (step S3: No), the ON / OFF state of the switch 20 is read (step S9). If the switch 20 is in the OFF state (step S10: No), the alarm sound setting is disabled and the process ends. On the other hand, if the switch 20 is in the ON state (step S10: Yes), the alarm sound setting is changed from invalid to valid (step S11), and a confirmation sound for notifying that the alarm sound setting is valid (in this example, , The same sound as the alarm sound) is sounded from the buzzer 30 (step S12), the alarm sound setting is written in the EEPROM 63 as valid (step S8), and the process is terminated.

  Thus, when the switch 20 is in the ON state when the power is turned on (for example, when the power is turned on while pressing the push button type switch 20), the alarm sound immediately before the power recovery stored in the EEPROM 63 is stored. The setting is changed and written to the EEPROM 63. In the gas leak detector 1, if the alarm sound setting is valid, a confirmation sound is generated when the power is turned on, and if the alarm sound setting is invalid, the power supply Since the confirmation sound is not generated when the power is turned on, the operator or the user who handles the gas leak detector 1 sets the alarm sound when the power is turned on, that is, whether the alarm sound generation is valid or invalid. Can be easily grasped.

  If reading of the EEPROM 63 (alarm sound setting) fails, the alarm sound setting may be valid and activated based on the fail-safe concept.

  In this example, the confirmation sound generated from the buzzer 30 to confirm the alarm sound setting (state) at power-on is the same sound as the alarm sound generated from the buzzer 30 at the time of alarm. In order to distinguish between the alarm sound and the alarm sound, the confirmation sound and the alarm sound may be different sounds.

<Operation for selecting lighting pattern of light source for power display>
Next, based on the flowchart shown in FIG. 3, the operation after power-on of the gas leak detector 1, specifically, a method for selecting the lighting pattern of the power source light source 40 for each alarm sound setting will be described.

  If the alarm sound setting is valid (step S21: Yes), the microcomputer 60 turns on the power display light source 40 (step S22), and if the alarm sound setting is invalid (step S21: No), for example, a power display A lighting pattern of blinking the light source 40 once every 5 seconds (step S23) is selected.

  Thereby, at the time of operation after turning on the power, an operator or a user who handles the gas leak detector 1 can easily grasp the alarm sound setting (status), that is, whether the alarm sound generation is valid or invalid. .

  Here, the alarm sound setting (state) is notified by the difference between the lighting and blinking of the power source light source 40, but the alarm sound setting (state) is caused by the difference in the blinking cycle of the power source light source 40, for example. ) May be notified. Further, as described above, the alarm sound setting (state) may be notified based on the color difference of the power source display light source 40.

<Operation of alarm sound at alarm>
Based on the flowchart shown in FIG. 4, an operation after the gas leak detector 1 is turned on, specifically, an operation when the gas sensor 10 detects gas and sounds a warning sound from the buzzer 30 will be described.

  The microcomputer 60 periodically confirms the concentration of the detected gas detected from the atmosphere by the gas sensor 10 (step S31), and if the detected gas concentration is less than the alarm concentration (step S32: No), the processing is performed. finish. On the other hand, when a gas having an alarm concentration or higher is detected (step S32: Yes), if the alarm sound setting is valid (step S33: Yes), an alarm sound is generated from the buzzer 30 (step S34), and the alarm sound setting is performed. Is invalid (step S33: No), the alarm is not sounded and the process ends. If a gas with an alarm concentration or more is detected (S32: Yes), the alarm output may be output to the outside via the relay 50 and displayed by the alarm display light source 41 regardless of whether the alarm sound setting is valid or invalid. Of course it is good.

  As can be seen from the above description, in the gas leak detector 1 of the present embodiment, the function for switching the alarm sound setting is made effective only when the power is turned on, that is, only when the power is turned on, particularly when the power is turned on. The alarm sound setting is performed by switching the alarm sound setting only when the switch 20 provided in 1 is in the ON state (the switch 20 is operated or pressed). Switching is not easily performed, and it is possible to reliably prevent changes in the alarm sound settings due to erroneous operations during periodic inspections and operations by unspecified number of people when installed in locations where an unspecified number of people touch such as stores. It becomes possible.

  Further, the switch 20 can be used for a predetermined function of the gas leak detector 1 (for example, a function for interrupting the generated alarm sound) other than the function of switching the alarm sound setting during the operation after the power is turned on. By providing a function for switching the alarm sound setting only at the time of input, the alarm sound setting can be switched without requiring a dedicated switch, and the number of parts can be reduced and the cost can be reduced.

  In addition, the presence or absence of a confirmation sound from the buzzer 30 at the time of power-on (in this example, the same sound as an alarm sound) and / or a difference in the lighting pattern of the light source 40 for power display (in this example, 1 in 5 seconds) The alarm sound setting is notified by the difference in color) or the color difference, so that the operator or the user who handles the gas leak detector 1 can easily set (the state of) the alarm sound. I can grasp it.

1 Gas leak detector 10 Gas sensor 20 Switch (input unit)
30 Buzzer 40 Light source for power display 41 Light source for alarm display 50 Relay 60 Microcomputer 61 I / O port (I / O)
62 A / D converter 63 EEPROM (storage unit)
64 Timer 65 RAM
66 ROM
67 CPU

Claims (7)

A gas leak detector that can switch between alarm sound settings for alarm sound generation validity and invalidity,
The gas leak detector is characterized in that the alarm sound setting is switched only when the power is turned on.   The alarm sound setting is switched only when an input signal input from an input unit provided in the gas leak detector is in a predetermined state when the power is turned on. Item 2. The gas leak detector according to Item 1.   The gas leak detector according to claim 2, wherein the input unit is used to input a signal other than switching the alarm sound setting during operation after power-on.   The gas leak detector according to any one of claims 1 to 3, wherein the alarm sound setting is notified depending on whether or not the alarm sound is generated when power is turned on.   When the warning sound setting is valid, the warning sound is generated when the power is turned on, and when the warning sound setting is invalid, the warning sound is not generated when the power is turned on. The gas leak detector according to claim 4, wherein the gas leak detector is characterized in that: The alarm sound setting is stored in a storage unit provided in the gas leak detector,
6. When power is restored after the power is turned off, the alarm sound setting before power restoration stored in the storage unit is read and restarted. The gas leak detector according to any one of the above.   The alarm sound setting is notified by a difference between lighting and blinking of a light source provided in the gas leak detector, a difference in blinking cycle, or a difference in color. The gas leak detector according to any one of 6.

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