Gas meter power supply device

Abstract

The utility model relates to the technical field of power supply equipment, in particular to a gas meter power supply device, which comprises a power supply control circuit and a gas sensor G, the power supply control circuit comprises an ac-dc converter circuit, a control circuit and a normally closed relay switch K1; the ac-dc converter circuit is electrically connected with the power supply end of the gas meter through the normally closed relay switch K1 to form a conductive loop; the control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1 and a field effect transistor Q1; the electronic components are connected in a matched mode. The gas meter power supply device can stably supply power to the gas meter, and can automatically cut off power to cut off gas supply once gas leakage occurs in a detection environment.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply equipment, in particular to a power supply device for a gas meter. Background Art

[0002] At present, most users install gas meters that are powered by multiple dry batteries connected in series. Since the power of dry batteries decreases with use, they will be insufficient after a period of use (usually about 3 to 6 months), which will affect the accuracy of gas meter measurement. In actual use, some users arbitrarily use AC and DC power adapters to connect the power supply end of the gas meter to replace the dry battery power supply, which poses an electrical safety hazard. Utility Model Content

[0003] Therefore, in view of the above-mentioned problems, the utility model proposes a gas meter power supply device, which can stably supply power to the gas meter and automatically cut off the power to cut off the gas supply once a gas leak occurs in the detection environment.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A gas meter power supply device, comprising a power supply control circuit and a gas sensor G;

[0006] The power supply control circuit includes an ac-dc converter circuit, a control circuit, and a normally closed relay switch K1;

[0007] The ac-dc converter circuit is electrically connected to the power supply terminal of the gas meter through the normally closed relay switch K1 to form a conductive loop;

[0008] The control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1 and a field effect transistor Q1;

[0009] The positive output end of the ac-dc converter circuit is grounded through the capacitor C1 and the resistor R2 in sequence, the positive output end of the ac-dc converter circuit is electrically connected to the positive electrode of the diode D1 through the resistor R1 and the gas detection sensor G in sequence, the cathode of the diode D1 is electrically connected to the gate of the field effect tube Q1 through the resistor R3, the cathode of the diode D1 is electrically connected to the source of the field effect tube Q1 through the resistor R4, the source of the field effect tube Q1 is electrically connected to the drain of the field effect tube Q1 through the capacitor C2, and the drain of the field effect tube Q1 is electrically connected to the control end of the normally closed relay switch K1.

[0010] Furthermore, it also includes a normally open relay switch K2 and an LED warning light; the ac-dc converter circuit is electrically connected to the LED warning light through the normally open relay switch K2;

[0011] The drain of the field effect transistor Q1 is electrically connected to the control end of the normally open relay switch K2.

[0012] Furthermore, it also includes a buzzer, which is connected in parallel with the LED warning light.

[0013] Furthermore, the gas detection sensor G adopts a semiconductor sensor or a catalytic combustion sensor.

[0014] By adopting the above technical solution, the beneficial effects of the utility model are:

[0015] The gas meter power supply device is connected to the mains when in use, and the power supply is stable. When the gas detection sensor G detects that the gas in the environment reaches a certain value, the gas detection sensor G outputs an electrical signal that is transmitted to the gate of the field effect tube Q1 through the diode D1 and the resistor R3, so that the field effect tube Q1 is turned on. At this time, the control end of the normally closed relay switch K1 receives the electrical signal, so that the normally closed relay switch K1 is disconnected, and the gas meter stops supplying power. At this time, the gas meter cuts off the gas supply; at the same time, the control end of the normally open relay switch K2 receives the electrical signal, so that the normally open relay switch K2 is turned on, the LED alarm light is on, and the buzzer emits a buzzer to remind the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit connection principle diagram of the utility model. DETAILED DESCRIPTION

[0017] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0018] refer to Figure 1 , this embodiment provides a gas meter power supply device, including a power control circuit, a gas sensor G, an LED alarm light and a buzzer. Preferably, the gas sensor G adopts a semiconductor sensor or a catalytic combustion sensor. The semiconductor sensor mainly uses the sensitivity of the semiconductor material to the gas to detect the gas concentration; specifically, when the gas contacts the semiconductor material, it will cause the change of the resistance value of the semiconductor material, thereby realizing the measurement of the gas concentration. The semiconductor sensor has a long service life, but the detection sensitivity is lower than that of the catalytic combustion sensor. The catalytic combustion sensor uses the principle that the gas burns under the action of a catalyst to detect the gas concentration; specifically, when the gas contacts the catalyst, a combustion reaction will occur, thereby changing the resistance value of the catalytic combustion sensor, thereby realizing the measurement of the gas concentration.

[0019] During installation, the gas sensor G may be installed near a device that delivers or uses gas, such as near a gas meter or a gas stove.

[0020] The LED warning light and buzzer are both existing electronic devices and will not be described in detail here.

[0021] The power control circuit includes an ac-dc converter circuit, a control circuit, a normally closed relay switch K1, and a normally open relay switch K2.

[0022] The ac-dc converter circuit is electrically connected to the power supply end of the gas meter through the normally closed relay switch K1 to form a conductive loop; when in use, the input end of the ac-dc converter circuit is connected to the mains (220V AC). The output end of the ac-dc converter circuit outputs DC power. Depending on different gas meters, the output end of the ac-dc converter circuit can be set to output DC power of 6V, 12V, or 24V.

[0023] The ac-dc converter circuit is electrically connected to the LED warning light via a normally open relay switch K2, and the buzzer is connected in parallel with the LED warning light.

[0024] The control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1 and a field effect transistor Q1.

[0025] The positive output end of the ac-dc converter circuit is connected to the ground through the capacitor C1 and the resistor R2 in turn, and the capacitor C1 and the resistor R1 play a filtering role. The positive output end of the ac-dc converter circuit is electrically connected to the positive electrode of the diode D1 through the resistor R1 and the gas detection sensor G in turn, and the resistor R1 plays a voltage dividing role; the gas detection sensor G detects the gas concentration and outputs an electrical signal proportional to the gas concentration. The cathode of the diode D1 is electrically connected to the gate of the field effect tube Q1 through the resistor R3, the cathode of the diode D1 is electrically connected to the source of the field effect tube Q1 through the resistor R4, the source of the field effect tube Q1 is electrically connected to the drain of the field effect tube Q1 through the capacitor C2, the drain of the field effect tube Q1 is electrically connected to the control end of the normally closed relay switch K1, and the drain of the field effect tube Q1 is electrically connected to the control end of the normally open relay switch K2.

[0026] When the electrical signal output by the gas detection sensor G turns on the diode D1, and then turns on the field effect transistor Q1. At this time, the control end of the normally closed relay switch K1 receives the electrical signal, which turns off the normally closed relay switch K1, and the gas meter stops supplying power. At this time, the gas meter cuts off the gas supply to eliminate electrical safety hazards; at the same time, the control end of the normally open relay switch K2 receives the electrical signal, which turns on the normally open relay switch K2, the LED alarm light turns on, and the buzzer sounds to remind the user that a gas leak may occur.

[0027] When the gas leakage problem is solved, the electrical signal output by the gas detection sensor G is insufficient to turn on the diode D1. At this time, the normally closed relay switch K1 is closed, the normally open relay switch K2 is opened, and power supply to the gas meter is restored.

[0028] The gas meter power supply device can stably supply power to the gas meter, and once a gas leak occurs in the detection environment, the power will be automatically cut off to cut off the gas supply, eliminating electrical safety hazards.

[0029] Of course, if the mains power is cut off, the user can disconnect the power supply device of the gas meter from the power supply terminal of the gas meter and install a dry battery for use. After the mains power is restored, the dry battery needs to be removed before the power supply device of the gas meter can be connected to the power supply terminal of the gas meter.

[0030] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A gas meter power supply device, characterized in that : including power supply control circuit and gas sensor G; The power supply control circuit includes an ac-dc converter circuit, a control circuit, and a normally closed relay switch K1; The ac-dc converter circuit is electrically connected to the power supply terminal of the gas meter through the normally closed relay switch K1 to form a conductive loop; The control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1 and a field effect transistor Q1; The positive output end of the ac-dc converter circuit is grounded through the capacitor C1 and the resistor R2 in sequence, the positive output end of the ac-dc converter circuit is electrically connected to the positive electrode of the diode D1 through the resistor R1 and the gas detection sensor G in sequence, the cathode of the diode D1 is electrically connected to the gate of the field effect tube Q1 through the resistor R3, the cathode of the diode D1 is electrically connected to the source of the field effect tube Q1 through the resistor R4, the source of the field effect tube Q1 is electrically connected to the drain of the field effect tube Q1 through the capacitor C2, and the drain of the field effect tube Q1 is electrically connected to the control end of the normally closed relay switch K1.

2. A gas meter power supply device according to claim 1, characterized in that : Also includes a normally open relay switch K2 and an LED alarm light; The ac-dc converter circuit is electrically connected to the LED warning light via a normally open relay switch K2; The drain of the field effect transistor Q1 is electrically connected to the control end of the normally open relay switch K2.

3. A gas meter power supply device according to claim 2, characterized in that : Also includes a buzzer, which is connected in parallel with the LED warning light.

4. A gas meter power supply device according to claim 1, characterized in that The gas detection sensor G adopts a semiconductor sensor or a catalytic combustion sensor.

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