CN219039855U

CN219039855U - Gas meter

Info

Publication number: CN219039855U
Application number: CN202223320719.2U
Authority: CN
Inventors: 孙至侃; 朱央洲
Original assignee: Goldcard Smart Group Co Ltd
Current assignee: Goldcard Smart Group Co Ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-16
Anticipated expiration: 2032-12-09

Abstract

The application provides a gas meter, including alarm signal isolator, a first power supply, a control unit, the energy storage unit, be equipped with the signal input part at the control unit, signal input part and alarm signal isolator electricity are connected, alarm signal isolator and first power electricity are connected, alarm signal isolator and energy storage unit electricity are connected, energy storage unit and alarm unit electricity are connected, alarm signal isolator and alarm unit electricity are connected, this energy storage unit has replaced the isolation power in the gas meter among the prior art, not only realized electric isolation with the first power in the gas meter, also do not need first power to last the power supply, the running power consumption of isolation power and the running cost who corresponds have been reduced.

Description

Gas meter

Technical Field

The application relates to the field of gas meters, in particular to a gas meter.

Background

With the recent attention to gas explosion accidents, users prevent leakage of gas by externally connecting a gas alarm to a circuit structure of a gas meter. Because the gas alarm is powered by the multi-purpose mains supply, and the gas metering device in the gas meter is a precise instrument, when the gas meter is directly connected with the gas alarm, the metering accuracy of the gas meter can be influenced by the interference signal in the gas alarm, and the loss of a user and a gas company is easy to cause.

In order to solve the above problems, a technician sets an isolation device at an alarm signal output interface of a gas alarm to electrically isolate the gas alarm from a gas meter, but in a practical use scenario, the gas alarm and the gas meter are often from different manufacturers, and when electromagnetic interference (Electromagnetic Interference, abbreviated as EMI) of the alarm is designed and isolated poorly, power frequency or other interference signals still enter the gas meter through a connecting wire, so that the metering and the working of the gas meter are affected. Therefore, the information transmission between the gas meter and the gas alarm needs to be completely isolated, and the gas alarm signal generation isolation and the power supply isolation of the gas meter comprise the gas alarm signal generation isolation and the gas alarm signal transmission isolation of the gas meter. The power supply of the information transmission path is often isolated by transformer equipment, the isolated power supply is often required to be continuously supplied with power to ensure that a controller in the gas meter receives an alarm signal when the alarm signal in the alarm unit is generated, and the operation power consumption and the corresponding cost of the isolated power supply are large, so that the gas meter is not beneficial to long-term use.

Disclosure of Invention

The application provides a gas meter for solve the technical problem that isolation power operation consumption and running cost are big in the gas meter.

The application provides a gas meter, which comprises an alarm signal isolating switch, a first power supply, a control unit and an energy storage unit; the control unit is provided with a signal input end;

the signal input end is electrically connected with the alarm signal isolating switch, the alarm signal isolating switch is electrically connected with the first power supply, the alarm signal isolating switch is electrically connected with the energy storage unit, the energy storage unit is electrically connected with the alarm unit, and the alarm signal isolating switch is electrically connected with the alarm unit.

In the technical scheme, the gas meter is provided with the alarm signal isolating switch, the first power supply, the control unit and the energy storage unit, the control unit is provided with the signal input end, the signal input end is electrically connected with the alarm signal isolating switch, the alarm signal isolating switch is electrically connected with the first power supply, the alarm signal isolating switch is electrically connected with the energy storage unit, the energy storage unit is electrically connected with the alarm unit, the alarm signal isolating switch is electrically connected with the alarm unit, the energy storage unit replaces an isolating power supply in the gas meter in the prior art, electric isolation is realized with the first power supply in the gas meter, continuous power supply of the first power supply is not needed, and the operation power consumption of the isolating power supply and the corresponding operation cost are reduced.

Optionally, the alarm signal isolating switch is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end; the alarm unit is provided with a first end and a second end;

the signal input end is electrically connected with the alarm signal output end, the alarm signal input end is electrically connected with the first end of the alarm unit, the first power supply end is electrically connected with the first power supply, the second power supply end is electrically connected with the first end of the energy storage unit, and the second end of the energy storage unit is electrically connected with the second end of the alarm unit.

Optionally, the gas meter further comprises a first resistor and a switch unit; the switch unit is provided with a first end, a second end, a third end and a fourth end;

the first power supply is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the first end of the switch unit, the second end of the switch unit is electrically connected with the first end of the energy storage unit, the second end of the energy storage unit is electrically connected with the third end of the switch unit, and the fourth end of the switch unit is grounded.

Optionally, the switch unit includes a charging relay and a relay driving circuit;

the charging relay is electrically connected with the first power supply, the charging relay is electrically connected with the relay driving circuit, and the relay driving circuit is electrically connected with the control unit.

Optionally, the relay driving circuit includes a third resistor, a fourth resistor, and a transistor; the control unit is also provided with a signal output end;

the first end of the third resistor is electrically connected with the signal output end of the control unit, the second end of the third resistor is electrically connected with the first end of the fourth resistor, the second end of the fourth resistor is grounded, the first end of the fourth resistor is electrically connected with the control end of the transistor, the second end of the transistor is electrically connected with the second end of the fourth resistor, and the first end of the transistor is electrically connected with the charging relay.

Optionally, the charging relay is provided with a first end, a second end, a third end, a fourth end, a first control end and a second control end; the switching unit further includes a diode;

the first end of the charging relay is used as the first end of the switch unit, the second end of the charging relay is used as the second end of the switch unit, the third end of the charging relay is used as the third end of the switch unit, and the fourth end of the charging relay is used as the fourth end of the switch unit; the first end of the transistor is electrically connected with the first control end, the first end of the transistor is electrically connected with the input end of the diode, and the output end of the diode is electrically connected with the second control end.

Optionally, the charging relay includes a first contact, a second contact, a third contact, and a fourth contact;

the first contact is electrically connected with the first end of the charging relay, the first contact is electrically connected with the second contact, the second contact is electrically connected with the second end of the charging relay, the third end of the charging relay is electrically connected with the third contact, the third contact is electrically connected with the fourth contact, and the fourth contact is electrically connected with the fourth end of the charging relay.

Optionally, the alarm signal isolation switch comprises a relay or an optocoupler.

Optionally, the energy storage unit includes an energy storage capacitor.

In the technical scheme, the gas meter replaces the first transformer serving as the isolation power supply with the energy storage capacitor, and realizes electric isolation between the first power supply and the energy storage capacitor by using the charging relay, so that the volume of the isolation power supply is reduced, the isolation power supply is not required to be charged in real time, the energy consumption of the first power supply is reduced only by charging the energy storage capacitor when the electric quantity of the energy storage capacitor is consumed, and meanwhile, the loss generated by leakage current of the energy storage capacitor is far less than the loss of electric energy on the coil of the first transformer when the energy storage capacitor does not work, the reduction of the operation power consumption of the isolation power supply is realized, and the working cost of the gas meter is saved.

In addition, the output signal of the circuit alarm is isolated from the circuit of the gas meter, so that the influence of external interference is avoided, the gas meter is protected, and meanwhile, the influence of measurement can be prevented, and the measurement precision is improved; in the process of circuit transformation, the used components are common electronic elements, and the circuit is simple and low in cost.

Optionally, the energy storage unit includes a second power source; the alarm signal isolating switch is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end; the alarm unit is provided with a first end and a second end; the second power supply is provided with a first end and a second end;

the signal input end is electrically connected with the alarm signal output end, the alarm signal input end is electrically connected with the first end of the alarm unit, the first power supply end is electrically connected with the first power supply, the second power supply end is electrically connected with the first end of the second power supply, and the second end of the second power supply is electrically connected with the second end of the alarm unit.

The gas meter that this application provided includes alarm signal isolator, first power, control unit, energy storage unit, be equipped with the signal input part at control unit, signal input part and alarm signal isolator electricity are connected, alarm signal isolator and first power electricity are connected, alarm signal isolator and energy storage unit electricity are connected, energy storage unit and alarm unit electricity are connected, alarm signal isolator and alarm unit electricity are connected, this energy storage unit has replaced the isolation power in the gas meter among the prior art, not only realized electric isolation with the first power in the gas meter, also do not need first power to last the power supply, the running power consumption of isolation power and the running cost who corresponds have been reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of a fuel gas alarm circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a fuel gas alarm circuit according to another embodiment of the present disclosure;

FIG. 3 is a schematic circuit diagram of a gas meter according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a gas meter according to another embodiment of the present disclosure;

fig. 5 is a schematic circuit diagram of a gas meter according to another embodiment of the present disclosure.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

It should be noted that, in this document, 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the present application may have the same meaning or may have different meanings, a particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, items, categories, and/or groups. The terms "or," "and/or," "including at least one of," and the like, as used herein, may be construed as inclusive, or meaning any one or any combination. For example, "including at least one of: A. b, C "means" any one of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; a and B and C ", again as examples," A, B or C "or" A, B and/or C "means" any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; a and B and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.

It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In order to solve the above problems, a technician sets an isolation device at an alarm signal output interface of a gas alarm to electrically isolate the gas alarm from a gas meter, wherein a schematic diagram of a gas alarm circuit formed by the gas alarm and the gas meter is shown in fig. 1, and in fig. 1, the gas alarm circuit comprises a first gas meter 10 and a gas alarm 20, and the first gas meter 10 and the gas alarm 20 are electrically connected. More specifically, the first gas meter 10 includes a control unit 101 and a power supply 102, and the gas alarm 20 includes a relay 201, a controller 202, and an AC/DC converter 203. In the first gas meter 10, a power source 102 and a control unit 101 are electrically connected; in the gas alarm 20, a first end of a coil in the relay 201 is electrically connected to an output end of the controller 202, and a second end of the coil is grounded. The control unit 101 is electrically connected to contacts of the relay 201. The controller 202 is provided with a first input terminal and a second input terminal, the AC/DC converter 203 is provided with a first output terminal and a second output terminal, the first input terminal of the controller 202 is electrically connected to the first output terminal of the AC/DC converter 203, and the second input terminal of the controller 202 is electrically connected to the second output terminal of the AC/DC converter 203 and then grounded. The AC/DC converter 203 is further provided with AC power input terminals a and B for connecting with a 220V AC power supply, and after the AC power supply is obtained, the AC power supply is converted into a DC working voltage required by the controller 202, the controller 202 is connected with a sensor for monitoring the concentration of the gas in the air, when the concentration of the gas is within the alarm preset range, the controller 202 determines that the concentration of the gas in the environment where the controller is located is abnormal, and the output terminal outputs an electrical signal, so that after the coil in the relay 201 is conductive, a contact in the relay 201 is conductive, and when the contact is conductive, the control unit 101 in the first gas meter 10 obtains an alarm signal to perform a corresponding emergency operation, for example: and controlling the corresponding gas valve to be closed. However, in the actual use scenario, the gas alarm and the gas meter are often from different manufacturers, and when the design and isolation of electromagnetic interference (Electromagnetic Interference, abbreviated as EMI) of the alarm are poor, power frequency or other interference signals still enter the gas meter through a connecting wire, so that the measurement and the operation of the gas meter are affected.

Therefore, the information transmission between the gas meter and the gas alarm needs to be completely isolated, and the gas alarm signal generation isolation and the power supply isolation of the gas meter comprise the gas alarm signal generation isolation and the gas alarm signal transmission isolation of the gas meter. More specifically, the schematic structural diagram of the gas alarm circuit that performs complete electrical isolation is shown in fig. 2, and compared to the circuit structure shown in fig. 1, the second gas meter 30 includes not only the power source 102 and the control unit 101, but also the first capacitor C1, the second capacitor C2, the first transformer 302, and the alarm signal isolation switch 301. The power supply 102 is electrically connected to the control unit 101, the power supply 102 is further electrically connected to the first capacitor C1 and an input end of the first transformer 302, a first output end of the first transformer 302 is electrically connected to a first end of the second capacitor C2, and is further electrically connected to a first contact of the relay 201 of the gas alarm 20, a second output end of the first transformer 302 is electrically connected to a second end of the second capacitor C2, and is further electrically connected to a first control end of the alarm signal isolation switch 301, and a second control end of the alarm signal isolation switch 301 is electrically connected to a second contact of the relay 201 of the gas alarm 20. The signal output end of the control unit 101 is electrically connected with the signal input end of the alarm signal isolating switch 301, and the signal output end of the alarm signal isolating switch 301 is electrically connected with the signal input end of the control unit 101. The power supply 102 continuously supplies power to the first transformer 302 to ensure the voltage value between the output ends of the first transformer 302, when the controller 202 in the gas alarm 20 monitors that the gas concentration is abnormal, the first contact and the second contact in the relay 201 are closed, the loop formed by the second capacitor C2, the contact of the relay 201 and the alarm signal isolating switch 301 is conducted, the signal input end and the signal output end in the alarm signal isolating switch 301 are conducted, and the signal input end of the control unit 101 receives the alarm signal to perform corresponding emergency operation.

In the circuit configuration shown in fig. 2, the transformer 201 performs gas alarm signal generation isolation, the alarm signal isolation switch 301 performs gas alarm signal transmission isolation of the gas meter, and the first transformer 301 performs power isolation operation as an isolated power source. Because the isolated power supply often needs continuous power supply of the power supply in the gas meter so as to ensure that the controller in the gas meter receives the alarm signal when the alarm signal in the alarm unit is generated, the operation power consumption and the corresponding cost of the isolated power supply are large, and the long-term use of the gas meter is not facilitated.

Aiming at the technical problems, the embodiment of the application provides a gas meter, which aims to solve the problems of high operation power consumption and high operation cost of an isolated power supply in the gas meter. The technical conception of the application is as follows: the gas meter is provided with an alarm signal isolating switch, a first power supply, a control unit and an energy storage unit, the control unit is provided with a signal input end, the signal input end is electrically connected with the alarm signal isolating switch, the alarm signal isolating switch is electrically connected with the first power supply, the alarm signal isolating switch is electrically connected with the energy storage unit, the energy storage unit is electrically connected with the alarm unit, the alarm signal isolating switch is electrically connected with the alarm unit, the energy storage unit replaces an isolating power supply in the gas meter in the prior art, electric isolation is realized with the first power supply in the gas meter, continuous power supply of the first power supply is not needed, and the operation power consumption of the isolating power supply and the corresponding operation cost are reduced.

Fig. 3 is a schematic circuit structure diagram of a gas meter according to an embodiment of the present application, as shown in fig. 3, the gas meter 40 includes an alarm signal isolating switch 301, a first power supply 102, a control unit 101 and an energy storage unit 401, the control unit is provided with a signal input end and a ground end, the signal input end is electrically connected with the alarm signal isolating switch 301, the alarm signal isolating switch 301 is electrically connected with the first power supply 102, the alarm signal isolating switch 301 is electrically connected with the energy storage unit 401, the energy storage unit 401 is electrically connected with a relay 201 in the alarm unit 20, and the alarm signal isolating switch 301 is electrically connected with the relay 201 in the alarm unit 20.

In the above technical solution, when the contact of the relay 201 in the alarm unit 20 is closed, the loop formed by the contact and the alarm signal isolation switch 301 is turned on, and the energy storage unit 401 provides an electrical signal for the loop to drive the contact in the alarm signal isolation switch 301 to be closed, so that the signal input end of the control unit 101 receives a high-level signal, and the high-level signal represents an alarm signal of abnormal gas concentration in the environment where the gas meter is located, so as to control the control unit 101 to perform a corresponding emergency operation. In the gas meter, the first power supply does not need to be connected with the energy storage unit in real time, the electric energy consumed by the energy storage unit is supported, and the operation power consumption and the corresponding operation cost of the isolation power supply are reduced.

More specifically, the energy storage unit 401 includes an energy storage capacitor or a second power source. When the energy storage unit 401 includes an energy storage capacitor, the circuit structure of the gas meter is as shown in fig. 4; when the energy storage unit 401 contains the second power source, the circuit structure of the gas meter is shown in fig. 5. The above two circuit configurations will be explained in a belief manner, respectively.

Fig. 4 is a schematic circuit diagram of a gas meter according to an embodiment of the present application, and as shown in fig. 4, the third gas meter 50 includes a control unit 101, an alarm isolation signal isolation switch 301, a first resistor R1, a second resistor R2, an energy storage capacitor C3, and a switch unit 502.

The control unit 101 is provided with a signal output end and a signal input end, the alarm signal isolating switch 301 is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end, and the alarm unit is provided with a first end and a second end. In the circuit diagram shown in fig. 4, the alarm signal output end is the pin 4 of the alarm signal isolation switch 301, the first power supply end is the pin 5 of the alarm signal isolation switch 301, the alarm signal input end is the pin 2 of the alarm signal isolation switch 301, and the second power supply end is the pin 1 of the alarm signal isolation switch 301. The signal input end of the control unit 101 is electrically connected with the alarm signal output end, the alarm signal input end is electrically connected with the first end of the alarm unit, the first power supply end is electrically connected with the second end of the second resistor R2, the first end of the second resistor R2 is electrically connected with the first power supply 102, the second power supply end is electrically connected with the first end of the energy storage capacitor C3, and the second end of the energy storage capacitor C3 is electrically connected with the second end of the alarm unit. In one embodiment, the alarm unit is a gas alarm 20, the first end of the alarm unit is a first output end of a transformer 201 in the gas alarm, and the second end of the alarm unit is a second output end of the transformer 201 in the gas alarm.

The switch unit 502 is provided with a first end, a second end, a third end and a fourth end, the first power supply 102 is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected with the first end of the switch unit 502, the second end of the switch unit 502 is electrically connected with the first end of the energy storage capacitor C3, the second end of the energy storage capacitor C3 is electrically connected with the third end of the switch unit 502, and the fourth end of the switch unit 502 is grounded.

More specifically, the switching unit 502 includes a charging relay 503, a relay driving circuit, and a diode D1. The charging relay 503 is electrically connected to the first power source 102, the charging relay 503 is electrically connected to the relay driving circuit, and the relay driving circuit is electrically connected to the control unit 101.

More specifically, the relay driving circuit includes a third resistor R3, a fourth resistor R4, and a transistor Q1. The first end of the third resistor R3 is electrically connected to the signal output end of the control unit 101, the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, the first end of the fourth resistor R4 is electrically connected to the control end of the transistor Q1, the second end of the transistor Q1 is electrically connected to the second end of the fourth resistor R4, and the first end of the transistor Q1 is electrically connected to the charging relay 503. In an embodiment, the transistor Q1 is a triode, the control terminal of the transistor Q1 is a base electrode of the triode, the first terminal of the transistor Q1 is a collector electrode of the triode, and the second terminal of the transistor Q1 is an emitter electrode of the triode.

The charging relay 503 is provided with a first end, a second end, a third end, a fourth end, a first control end and a second control end, in the circuit structure shown in fig. 4, the first end of the charging relay 503 is a pin 3, the second end is a pin 4, the third end is a pin 5, the fourth end is a pin 6, the first control end is a pin 1, the second control end is a pin 8, and the pin 2 and the pin 7 of the charging relay 503 are suspended.

The first end of the charging relay 503 is used as the first end of the switch unit 502, and is electrically connected with the first resistor R1, the second end of the charging relay 503 is used as the second end of the switch unit 502, and is electrically connected with the first end of the energy storage capacitor C3, the third end of the charging relay 503 is used as the third end of the switch unit 502, and is electrically connected with the second end of the energy storage capacitor C3, and the fourth end of the charging relay 503 is used as the fourth end of the switch unit 502, and is grounded.

The first end of the transistor Q1 is electrically connected to the first control end of the charging relay 503, the first end of the transistor Q1 is also electrically connected to the input end of the diode D1, the output end of the diode D1 is electrically connected to the second control end of the charging relay 503, and is also electrically connected to the first end of the first resistor R1, the first end of the second resistor R2, and the first power supply 102.

The charging relay 503 includes a first contact, a second contact, a third contact, and a fourth contact, where the first contact is electrically connected to a first end of the charging relay, the second contact is electrically connected to a second end of the charging relay, a third end of the charging relay is electrically connected to the third contact, and the fourth contact is electrically connected to a fourth end of the charging relay.

The charging relay 503 further includes a fifth contact electrically connected to the pin 2 and a sixth contact electrically connected to the pin 7. The first contact is electrically connected to the fifth contact/second contact, and the fourth contact is electrically connected to the third contact/sixth contact.

When the charge amount stored in the storage capacitor C3 is not less than the preset threshold value, the storage capacitor C can be used as the energy storage unit to supply current to the closed loop where the energy storage unit is located. In the case that the alarm signal isolating switch 301 is a relay, when the alarm unit does not detect that the concentration of the gas in the environment is abnormal, the first contact and the second contact in the relay 201 are not closed, the loop formed by the two contacts, the coil in the alarm signal isolating switch 301 and the energy storage capacitor C3 is not conducted, the pin 3 in the alarm signal isolating switch 301 is connected with the pin 4, and the signal received by the signal input end of the control unit 101 is at a low level because the pin 3 is suspended, and the low level indicates a non-alarm signal.

When the alarm unit monitors that the concentration of the fuel gas in the environment is abnormal, the loop where the coil in the alarm signal isolating switch 301 is located is conducted, the energy storage capacitor C3 discharges to the coil, the pin 4 of the alarm signal isolating switch 301 is electrically connected with the pin 5 through electromagnetic induction of the coil, and as the pin 5 is electrically connected with the first power supply 102 through the second resistor R2, the signal input end of the control unit 101 receives a high-level signal, the high-level signal is an alarm signal, and the control unit 101 executes corresponding emergency operation after receiving the alarm signal.

Since the energy storage capacitor C3 discharges during operation, the amount of charge stored in the capacitor decreases, the voltage across the capacitor decreases, and at the same time, the energy storage capacitor C3 also generates leakage current when not operating, resulting in a loss of the amount of charge in the energy storage capacitor C3. The control unit 101 is therefore required to control the amount of charge that the first power supply 102 supplements to it.

When the control unit 101 does not control the first power supply 102 to perform charging operation, the signal output end of the control unit outputs a low-level signal, the voltage of the control end of the transistor Q1 does not meet the working voltage of the transistor, the first end and the second end of the control unit are not conducted, the circuit where the pin 8 of the charging relay 503 electrically connected with the first end of the transistor Q1 and the pin 1 are located is in a disconnected state, the charging relay 503 does not work, the pin 3 of the charging relay is electrically connected with the suspended pin 2, the pin 6 of the charging relay is electrically connected with the suspended pin 7, and the first power supply does not supply power to the energy storage capacitor C3.

When the control unit 101 controls the first power supply 102 to perform charging operation, the signal output end of the control unit outputs a high level, after the high level is divided by the third resistor R3 and the fourth resistor R4, the voltage at two ends of the fourth resistor R4 meets the working voltage of the transistor Q1, the first end and the second end of the control unit are conducted, the coil in the first power supply 102 and the charging relay 503 and the loop where the transistor Q1 is located are conducted, under the electromagnetic induction action of the coil, the first contact and the second contact in the charging relay 503 are electrically connected, the third contact and the fourth contact are electrically connected, that is, the pin 3 and the pin 4 are electrically connected, and the pin 6 and the pin 5 are electrically connected, so that the first power supply 102 charges the energy storage capacitor C3 through the first resistor R1 to supplement the lost charge quantity.

In the above technical solution, the control unit 101 is a minimum system circuit including a single-chip microcomputer, and in this application, the model of the single-chip microcomputer is not specifically limited.

In another embodiment, the alarm signal isolating switch can also be an optocoupler, and both the relay and the charging relay can also be replaced by optocouplers.

Fig. 5 is a schematic circuit diagram of a gas meter according to another embodiment of the present application, and as shown in fig. 5, a fourth gas meter 60 includes a control unit 101, a first power source 102, a second resistor R2, an energy storage unit and an alarm signal isolation switch 301, where the energy storage unit includes a second power source 504.

The alarm signal isolating switch 301 is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end, the alarm unit is provided with a first end and a second end, and the second power supply is provided with a first end and a second end. In an embodiment, the alarm signal output end is the pin 4 of the alarm signal isolation switch 301, the alarm signal input end is the pin 2 of the alarm signal isolation switch 301, the first power supply end is the pin 5 of the alarm signal isolation switch 301, and the second power supply end is the pin 1 of the alarm signal isolation switch 301.

The signal input end of the control unit 101 is electrically connected with the alarm signal output end, the alarm signal input end is electrically connected with the first end of the alarm unit, the first power supply end is electrically connected with the second end of the second resistor R2, the first end of the second resistor R2 is electrically connected with the first power supply 102, the second power supply end is electrically connected with the first end of the second power supply 504, and the second end of the second power supply 504 is electrically connected with the second end of the alarm unit and then grounded.

When the alarm unit detects that the concentration of the fuel gas in the environment where the alarm unit is located is abnormal, the first end and the second end of the alarm unit are electrically connected, the coil in the alarm signal isolating switch 301 is conducted under the power supply action of the second power supply 504, the pin 4 and the pin 5 of the coil are closed, and the signal input end of the control unit 101 obtains a high-level signal sent by the first power supply 102 and performs corresponding emergency operation. In one embodiment, the second power source is a backup battery.

In the above technical scheme, the second power supply only consumes power when the alarm unit performs alarm operation, compared with the energy storage capacitor in the circuit structure shown in fig. 4, no loss generated by leakage current exists, the power consumption and cost of the gas meter are reduced again, in addition, the second power supply and the first power supply are physically isolated, and the gas meter plays a role in protection.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. The gas meter is characterized by comprising an alarm signal isolating switch, a first power supply, a control unit and an energy storage unit; the control unit is provided with a signal input end;

2. The gas meter of claim 1, wherein the alarm signal isolation switch is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end; the alarm unit is provided with a first end and a second end;

3. The gas meter of claim 1, further comprising a first resistor and a switch unit; the switch unit is provided with a first end, a second end, a third end and a fourth end;

4. A gas meter as claimed in claim 3, wherein the switching unit comprises a charging relay and a relay driving circuit;

5. The gas meter of claim 4, wherein the relay drive circuit comprises a third resistor, a fourth resistor, and a transistor; the control unit is also provided with a signal output end;

6. The gas meter of claim 5, wherein the charge relay is provided with a first end, a second end, a third end, a fourth end, a first control end, and a second control end; the switching unit further includes a diode;

7. The gas meter of claim 6, wherein the charging relay comprises a first contact, a second contact, a third contact, and a fourth contact;

8. The gas meter of claim 1, wherein the alarm signal isolation switch comprises a relay or an optocoupler.

9. A gas meter as claimed in any one of claims 1 to 8, wherein the energy storage unit comprises an energy storage capacitor.

10. The gas meter of claim 1, wherein the energy storage unit comprises a second power source; the alarm signal isolating switch is provided with an alarm signal output end, an alarm signal input end, a first power supply end and a second power supply end; the alarm unit is provided with a first end and a second end; the second power supply is provided with a first end and a second end;