Safety isolation connection circuit of combustible gas detector

Abstract

The utility model discloses a combustible gas detector safety isolation connection circuit. One end of a first MCU control module is respectively connected with a first relay and a second relay; the other end of the first MCU control module is also connected with a methane sensor; a second pin of the first relay is connected with a second pin of the first wiring terminal; the first pin of the second relay is connected with the output end of the battery, and the third pin of the second relay is connected with the third pin of the first wiring terminal, the grounding pin of the battery and the first pin of the first wiring terminal. According to the utility model, the first U control module is connected with the methane sensor, so that the gas concentration can be monitored in real time. When combustible gas is detected, the first U control module can respond in time to control the on-off state of the relay. Through the use of the relay, the detection circuit and the high-voltage power supply can be effectively isolated, potential safety hazards caused by electrical faults are avoided, and the safety of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model gas safety technology belongs to the field, specifically is a combustible gas detector safety isolation connecting circuit. BACKGROUND

[0002] With the national gas user number grows rapidly year by year, city gas safety accident has become the third killer after traffic accident, industrial injury in our country. Combustible gas alarm device can detect combustible gas leakage, and timely through wired or wireless mode informs gas meter, gas shut-off valve to close valve, so that user and gas enterprise can take measures, avoid accident and other serious consequences, is the last line of defense of gas use link.

[0003] At present, most combustible gas detector and gas meter or gas shut-off valve are connected through wire, such as gas leakage, combustible gas detector will pass through wire transmission high low level or 9-12V pulse to gas meter or gas shut-off valve to close gas valve.

[0004] The GND of the conventional combustible gas detector and the GND of the gas meter or the gas shut-off valve are physically connected, and the alarm signal of the detector and the alarm signal of the gas meter or the pulse signal of the gas shut-off valve are physically connected, and the circuit of the detector may be connected to the shell or the mainboard of the gas meter or the gas shut-off valve through wire under abnormal conditions, causing unsafe factors. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a combustible gas detector safety isolation connecting circuit to solve the problem that the GND of the conventional combustible gas detector is connected with the GND of the gas meter or the shut-off valve, and the alarm signals are also physically connected, which causes the detector circuit to receive 220V alternating current signal or induced current under abnormal conditions, thereby causing unsafe factors.

[0006] To solve the above technical problems, the utility model adopts the technical scheme of:

[0007] A combustible gas detector safety isolation connecting circuit, including MCU control module, first relay, second relay, battery and first wiring terminal, one end of MCU control module is connected with first relay, second relay respectively, the other end of MCU control module is still connected with methane sensor,

[0008] Pin 1 of the first relay is connected to pin 2 of the second relay; pin 2 of the first relay is connected to pin 2 of the first wiring terminal; pin 1 of the second relay is connected to the output end of the battery, and pin 3 of the second relay is respectively connected to pin 3 of the first wiring terminal, the ground pin of the battery, and pin 1 of the first wiring terminal.

[0009] According to the above technical solution, the first MCU control module is also connected to a button, which is used to control the status of the first MCU control module.

[0010] According to the above technical solution, the other end of the first terminal is connected to the gas meter circuit and the gas shut-off valve circuit respectively.

[0011] According to the above technical solution, the gas meter circuit includes a second terminal, a second MCU control module and a valve; one end of the second terminal is connected to the first terminal, the other end of the second terminal is connected to the second MCU control module, and the second MCU control module is further connected to the valve.

[0012] According to the above technical solution, pin No. 1, pin No. 2 and pin No. 3 of the first wiring terminal are connected to pin No. 1, pin No. 2 and pin No. 3 of the second wiring terminal respectively.

[0013] According to the above technical solution, pin 1, pin 2 and pin 3 of the second wiring terminal are respectively connected to the second MCU control module.

[0014] According to the above technical solution, the gas meter circuit also includes resistor R2 and resistor R3; resistor R2 is connected to pin 1 of the second terminal and the second MCU control module; resistor R3 is connected to pin 2 of the second terminal and the second MCU control module; the other ends of resistor R2 and resistor R3 are connected to the power supply.

[0015] According to the above technical solution, the gas shut-off valve circuit includes a third terminal, a resistor R1, a switch K1, a capacitor C1 and a solenoid valve YV; wherein one end of the third terminal is connected to the first terminal; the other end of the third terminal is connected to the resistor R1, the capacitor C1 and one end of the solenoid valve YV.

[0016] According to the above technical solution, pin No. 1 and pin No. 2 of the third wiring terminal are connected to pin No. 2 and pin No. 3 of the first wiring terminal respectively.

[0017] According to the technical scheme, the No.1 pin of the third terminal is further connected with one end of the resistor R1, the other end of the resistor R1 is respectively connected with the capacitor C1 and one end of the switch K1, the other end of the capacitor C1 is respectively connected with the No.2 pin of the third terminal and one end of the electromagnetic valve YV, and the other end of the electromagnetic valve YV is connected with the other end of the switch K1.

[0018] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0019] In the utility model, through the connection of the first U control module and the methane sensor, the gas concentration can be monitored in real time.When the combustible gas is detected, the first U control module can make a timely response to control the switching state of the relay. Through the use of the relay, the detection circuit and the high-voltage power supply can be effectively isolated, the safety hidden danger caused by electrical failure is avoided, and the safety of the system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic view of the household combustible gas detector with the built-in safety isolation circuit.

[0021] Figure 2 It is a schematic view of the connection between the household combustible gas detector and the intelligent gas meter.

[0022] Figure 3 It is a schematic view of the connection between the household combustible gas detector and the gas cut-off valve.

[0023] Marked in the figure: 100 - first MCU control module, 200 - first relay, 300 - second relay, 400 - battery, 500 - first terminal, 600 - button, 700 - second terminal, 800 - second MCU control module, 900 - valve, 110 - resistor R2, 111 - resistor R3, 112 - third terminal, 113 - resistor R1, 114 - switch K1, 115 - capacitor C1, 116 - electromagnetic valve YV. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] Embodiment one

[0026] As Figure 1As shown, a combustible gas detector safety isolation connection circuit includes a first MCU control module 100, a first relay 200, a second relay 300, a battery 400, and a first terminal 500; one end of the first MCU control module 100 is connected to the first relay 200 and the second relay 300 respectively; the other end of the first MCU control module 100 is also connected to the methane sensor;

[0027] Pin 1 of the first relay 200 is connected to pin 2 of the second relay 300; pin 2 of the first relay 200 is connected to pin 2 of the first wiring terminal 500; pin 1 of the second relay 300 is connected to the output end of the battery 400, and pin 3 of the second relay 300 is respectively connected to pin 3 of the first wiring terminal 500, the ground pin of the battery 400, and pin 1 of the first wiring terminal 500.

[0028] In this utility model, the connection between the first U control module and the methane sensor enables real-time monitoring of gas concentration. When combustible gas is detected, the first U control module promptly responds by controlling the on / off state of the relay. The use of the relay effectively isolates the detection circuit from the high-voltage power supply, preventing potential safety hazards caused by electrical failures and improving system security.

[0029] Example 2

[0030] This embodiment is a further refinement of the first embodiment.

[0031] The first MCU control module 100 is further connected to a button 600 , which is used for state control of the first MCU control module 100 .

[0032] Furthermore, the battery 400 is a 9V disposable battery 400 .

[0033] A combustible gas detector safety isolation connection circuit has a built-in AC-DC power supply module, a first MCU control module 100, a methane sensor, a first relay 200, a second relay 300, a battery 400, a first terminal 500 and a button 600, wherein conventional units such as a display unit, a buzzer unit and other units are not drawn in the figure.

[0034] A DC power supply is provided to the isolated connection circuit through the AC-DC module, and the first MCU control module 100 controls the status of the first relay 200 and the second relay 300 through IO; the methane sensor provides the first MCU control module 100 with the current methane concentration value in the air, and the first MCU control module 100 can be controlled to be connected to the gas meter circuit or the gas shut-off valve circuit by multiplexing the button 600. In this embodiment, the isolated connection circuit is connected to the gas meter circuit by default.

[0035] Initially, pin 3 (GND) and pin 1 (ONLINE) of the first wiring terminal 500 are connected to pin 3 of the second relay 300 and to the ground pin of the battery 400 (9V disposable battery 400). Pin 2 (Alarm) of the first wiring terminal 500 is connected to pin 2 of the first relay 200. Pins 2 and 3 of the first relay 200 are connected, as are pins 2 and 3 of the second relay 300. Pin 1 of the first relay 200 is connected to pin 2 of the second relay 300, and pin 3 of the first relay 200 is left floating.

[0036] This embodiment provides a specific implementation method. When the isolation connection circuit is connected to the gas meter circuit:

[0037] The gas meter circuit includes a second terminal 700, a second MCU control module 800 and a valve 900; one end of the second terminal 700 is connected to the first terminal 500, the other end of the second terminal 700 is connected to the second MCU control module 800, and the second MCU control module 800 is further connected to the valve 900.

[0038] Pin 1, pin 2 and pin 3 of the first connection terminal 500 are connected to pin 1, pin 2 and pin 3 of the second connection terminal 700 respectively.

[0039] Pin 1, pin 2, and pin 3 of the second connection terminal 700 are connected to the second MCU control module 800 respectively.

[0040] The gas meter circuit also includes a resistor R2110 and a resistor R3111; the resistor R2110 is connected to pin 1 of the second terminal 700 and the second MCU control module 800; the resistor R3111 is connected to pin 2 of the second terminal 700 and the second MCU control module 800; the other ends of the resistor R2110 and the resistor R3111 are connected to the power supply.

[0041] like Figure 2 As shown, pin 1 (ONLINE port) of the second terminal 700 of the gas meter circuit is connected to pin 1 (ONLINE port) of the first terminal 500 through a wired connection, pin 3 (GND port) of the second terminal 700 is connected to pin 3 (GND port) of the first terminal 500 through a wired connection, and pin 2 (Alarm port) of the second terminal 700 is connected to pin 1 (Alarm port) of the first terminal 500 through a wired connection.

[0042] A, When the detector safety isolation connection circuit is connected with the gas meter circuit through a wired connection, since the No. 1 pin (ONLINE port) and the No. 3 pin (GND port) of the first wiring terminal 500 in the detector safety isolation connection circuit are connected, the second MCU control module 800 detects that the No. 1 pin (ONLINE port) of the first wiring terminal 500 changes from high level to low level, and the gas meter circuit automatically judges that the combustible gas detector is online.

[0043] B, When the first MCU control module 100 of the detector safety isolation connection circuit controls the No. 2 pin and the No. 1 pin of the first relay 200 to be connected according to the detection of the methane sensor that the methane concentration exceeds the threshold value, at this time, the No. 1 pin (Alarm port) of the first wiring terminal 500 of the detector safety isolation connection circuit is connected with GND through the No. 1 pin and the No. 2 pin of the first relay 200 and the No. 2 pin and the No. 3 pin of the second relay 300. At this time, the second MCU control module 800 of the gas meter circuit detects that the No. 1 pin (Alarm port) of the first wiring terminal 500 changes from high level to low level, and the gas meter circuit automatically closes the valve to cut off the gas flow in the gas user pipeline, thereby ensuring safety.

[0044] When the first MCU control module 100 of the detector safety isolation connection circuit controls the No. 2 pin and the No. 3 pin of the first relay 200 to be connected through the methane sensor that the methane concentration is lower than the threshold value, at this time, the No. 2 pin (Alarm port) of the first wiring terminal 500 of the detector safety isolation connection circuit is connected through the No. 2 pin and the No. 3 pin of the first relay 200, since the No. 3 pin of the first relay 200 is in a suspended state, at this time, the second MCU control module 800 of the gas meter circuit detects that the No. 2 pin (Alarm port) of the first wiring terminal 500 changes from low level to high level, and the gas meter circuit automatically opens the valve or prompts the user to manually open the valve, thereby ensuring normal gas use of the user.

[0045] The embodiment provides another specific implementation. When the gas shut-off valve circuit is connected with the detector safety isolation connection circuit:

[0046] As shown in Figure 3 The gas shut-off valve circuit includes a third wiring terminal 112, a resistor R1113, a switch K1114, a capacitor C1115 and a solenoid valve YV116; one end of the third wiring terminal 112 is connected with the first wiring terminal 500; the other end of the third wiring terminal 112 is connected with the resistor R1113, the capacitor C1115 and one end of the solenoid valve YV116.

[0047] The No. 1 pin and the No. 2 pin of the third wiring terminal 112 are respectively connected with the No. 2 pin and the No. 3 pin of the first wiring terminal 500.

[0048] The No. 1 pin of the third terminal 112 is also connected with one end of the resistor R1113, the other end of the resistor R1113 is connected with the capacitor C1115 and one end of the switch K1114 respectively; the other end of the capacitor C1115 is connected with the No. 2 pin of the third terminal 112 and one end of the electromagnetic valve YV116 respectively, the other end of the electromagnetic valve YV116 is connected with the other end of the switch K1114.

[0049] The gas cut-off valve circuit is connected with the detector safety isolation connection circuit, in the detector safety isolation connection circuit, the No. 2 pin and the No. 1 pin of the first relay 200 are connected, the No. 2 pin and the No. 1 pin of the second relay 300 are connected when the button 600 is pressed for more than 3 seconds. The No. 2 pin (GND port) of the third terminal 112 of the gas cut-off valve circuit is connected with the No. 3 pin (GND port) of the first terminal 500 through a wire, the No. 1 pin (9V port) of the third terminal 112 is connected with the No. 2 pin (Alarm port) of the first terminal 500 through a wire.

[0050] A, the conventional gas cut-off valve has no ONLINE detection function, and has no online state discrimination function of the gas cut-off valve in this state.

[0051] B, when the first MCU control module 100 of the detector safety isolation connection circuit detects that the methane concentration exceeds the threshold through the methane sensor, the No. 2 pin and the No. 1 pin of the first relay 200 are connected, the No. 2 pin and the No. 1 pin of the second relay 300 are connected, at this time, the No. 2 pin (Alarm port) of the first terminal 500 of the detector safety isolation connection circuit is connected with the 9V port of the battery 400 through the No. 2 pin and the No. 1 pin of the first relay 200, the No. 2 pin and the No. 1 pin of the second relay 300. Because the gas cut-off valve circuit is pulse controlled, after 100-400 ms, the first MCU control module 100 of the detector safety isolation connection circuit controls the No. 2 pin and the No. 1 pin of the second relay 300 to be disconnected, the gas cut-off valve circuit automatically cuts off the gas flow in the gas user pipeline, and safety is ensured.

[0052] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0053] It should be pointed out finally that: the above only for the preferred embodiments of the present application and is not intended to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included within the scope of the present application.

Claims

1. A combustible gas detector safety isolation connection circuit, characterized by: The device comprises a first MCU control module (100), a first relay (200), a second relay (300), a battery (400), and a first connection terminal (500); one end of the first MCU control module (100) is connected to the first relay (200) and the second relay (300), respectively; the other end of the first MCU control module (100) is also connected to a methane sensor; Pin No. 1 of the first relay (200) is connected to pin No. 2 of the second relay (300); pin No. 2 of the first relay (200) is connected to pin No. 2 of the first wiring terminal (500); pin No. 1 of the second relay (300) is connected to the output end of the battery (400), and pin No. 3 of the second relay (300) is respectively connected to pin No. 3 of the first wiring terminal (500), the ground pin of the battery (400), and pin No. 1 of the first wiring terminal (500).

2. The combustible gas detector safety isolation connection circuit according to claim 1, characterized in that: The first MCU control module (100) is also connected to a button (600), and the button (600) is used for state control of the first MCU control module (100).

3. The combustible gas detector safety isolation connection circuit according to claim 1, characterized in that: The other end of the first connection terminal (500) is connected to the gas meter circuit and the gas shut-off valve circuit respectively.

4. The combustible gas detector safety isolation connection circuit according to claim 3, characterized in that: The gas meter circuit comprises a second wiring terminal (700), a second MCU control module (800) and a valve (900); wherein one end of the second wiring terminal (700) is connected to the first wiring terminal (500), the other end of the second wiring terminal (700) is connected to the second MCU control module (800), and the second MCU control module (800) is further connected to the valve (900).

5. The combustible gas detector safety isolation connection circuit according to claim 4, characterized in that: Pin No. 1, Pin No. 2 and Pin No. 3 of the first connecting terminal (500) are connected to Pin No. 1, Pin No. 2 and Pin No. 3 of the second connecting terminal (700) respectively.

6. The combustible gas detector safety isolation connection circuit according to claim 5, characterized in that: Pin 1, pin 2 and pin 3 of the second connection terminal (700) are respectively connected to the second MCU control module (800).

7. The combustible gas detector safety isolation connection circuit according to claim 6, characterized in that: The gas meter circuit further comprises a resistor R2 (110) and a resistor R3 (111); the resistor R2 (110) is connected to pin No. 1 of the second wiring terminal (700) and the second MCU control module (800); the resistor R3 (111) is connected to pin No. 2 of the second wiring terminal (700) and the second MCU control module (800); and the other ends of the resistor R2 (110) and the resistor R3 (111) are connected to a power supply.

8. The combustible gas detector safety isolation connection circuit according to claim 7, characterized in that: The gas shut-off valve circuit comprises a third wiring terminal (112), a resistor R1 (113), a switch K1 (114), a capacitor C1 (115) and a solenoid valve YV (116); wherein one end of the third wiring terminal (112) is connected to the first wiring terminal (500); and the other end of the third wiring terminal (112) is connected to the resistor R1 (113), the capacitor C1 (115) and one end of the solenoid valve YV (116).

9. The combustible gas detector safety isolation connection circuit according to claim 8, characterized in that: Pin No. 1 and Pin No. 2 of the third wiring terminal (112) are connected to Pin No. 2 and Pin No. 3 of the first wiring terminal (500) respectively.

10. The combustible gas detector safety isolation connection circuit according to claim 9, characterized in that: Pin No. 1 of the third wiring terminal (112) is also connected to one end of the resistor R1 (113), and the other end of the resistor R1 (113) is respectively connected to one end of the capacitor C1 (115) and the switch K1 (114); the other end of the capacitor C1 (115) is respectively connected to pin No. 2 of the third wiring terminal (112) and one end of the solenoid valve YV (116), and the other end of the solenoid valve YV (116) is connected to the other end of the switch K1 (114).

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