Natural gas leakage detection device

Abstract

The utility model relates to the technical field of natural gas detection equipment, in particular to a natural gas leakage detection device, which comprises a controller comprising a control circuit, an OR gate circuit, a first comparator and a second comparator; the input end of the first comparator inputs a methane concentration signal and compares the methane concentration signal with a first basic signal, and the output end outputs a high level or a low level according to a comparison result; the input end of the second comparator inputs a thiophane concentration signal and compares the thiophane concentration signal with a second basic signal, and the output end of the second comparator outputs a high level or a low level according to a comparison result; two input ends of the OR gate circuit are respectively connected with output ends of the first comparator and the second comparator, and the OR gate circuit is used for outputting a high level or a low level according to the high level or the low level received by the input ends; the control circuit is connected with the output end of the AND / OR gate circuit and triggers the alarm to give an alarm according to the high level. According to the scheme, multi-dimensional leakage detection can be carried out, the detection accuracy can be improved, leakage can be found in time, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas detection equipment, in particular to a natural gas leakage detection device. Background Technique

[0002] For the safe use of natural gas, a natural gas leakage detection device will be set up. Generally, it judges whether there is natural gas leakage by detecting the methane concentration in the environment, and a stench agent will also be added to the colorless and odorless natural gas so that people can identify the leakage through the smell; however, a single methane concentration sensor may malfunction, resulting in inaccurate detection; and the diffusion of the odor requires people to smell it before they can realize that natural gas has leaked; the later the leakage is discovered, the more dangerous it is. It is crucial to discover the leakage in time.

[0003] Therefore, there is an urgent need for a natural gas leakage detection device that can perform multi-dimensional leakage detection, improve the detection accuracy, discover the leakage in time, and reduce potential safety hazards. Content of the Utility Model

[0004] The utility model aims to provide a natural gas leakage detection device that can perform multi-dimensional leakage detection, improve the detection accuracy, discover the leakage in time, and reduce potential safety hazards.

[0005] The utility model provides the following basic scheme: A natural gas leakage detection device includes: a methane sensor, a tetrahydrothiophene sensor, a controller, and an alarm.

[0006] The methane sensor is used to detect the methane concentration in the monitoring area, generate a methane concentration signal, and send it to the controller.

[0007] The tetrahydrothiophene sensor is used to detect the tetrahydrothiophene concentration in the monitoring area, generate a tetrahydrothiophene concentration signal, and send it to the controller.

[0008] The controller is used to receive the methane concentration signal and the tetrahydrothiophene concentration signal, and trigger the alarm to give an alarm according to the methane concentration signal or the tetrahydrothiophene concentration signal.

[0009] The controller includes: a control circuit, an OR gate circuit, a first comparator, and a second comparator.

[0010] The input end of the first comparator inputs the methane concentration signal, compares it with the first reference signal, and the output end outputs a high level or a low level according to the comparison result.

[0011] The input end of the second comparator inputs the tetrahydrothiophene concentration signal, compares it with the second reference signal, and the output end outputs a high level or a low level according to the comparison result.

[0012] The two input terminals of the OR gate circuit are respectively connected to the output terminals of the first comparator and the second comparator, and are used to output a high level or a low level at the output terminal according to the high level or low level received at the input terminal;

[0013] The control circuit is connected to the output terminal of the OR gate circuit and triggers the alarm to give an alarm according to the high level.

[0014] Beneficial effects of the basic solution: The odorant in natural gas is tetrahydrothiophene. Therefore, a methane sensor and a tetrahydrothiophene sensor are set up in this solution; the methane concentration in the monitoring area is detected by the methane sensor, and the tetrahydrothiophene concentration in the monitoring area is detected by the tetrahydrothiophene sensor. Leak detection is carried out from two dimensions, and the tetrahydrothiophene sensor detects the tetrahydrothiophene concentration in the monitoring area. Instead of relying on human smell for subjective judgment, the tetrahydrothiophene sensor makes an objective judgment. Even if people don't smell the odor in time, the tetrahydrothiophene sensor can still detect the tetrahydrothiophene concentration in the monitoring area in time;

[0015] The controller will receive the methane concentration signal and the tetrahydrothiophene concentration signal, and trigger the alarm to give an alarm according to the methane concentration signal or the tetrahydrothiophene concentration signal. Specifically, the controller includes: a control circuit, an OR gate circuit, a first comparator and a second comparator; the methane concentration signal is input to the input terminal of the first comparator and compared with the first reference signal. If the methane concentration signal is greater than the first reference signal, that is, the methane concentration in the monitoring area is greater than the preset methane concentration upper limit, the output terminal outputs a high level, otherwise it outputs a low level; the tetrahydrothiophene concentration signal is input to the input terminal of the second comparator and compared with the second reference signal. If the tetrahydrothiophene concentration signal is greater than the second reference signal, that is, the tetrahydrothiophene concentration in the monitoring area is greater than the preset tetrahydrothiophene concentration upper limit, the output terminal outputs a high level, otherwise it outputs a low level; the two input terminals of the OR gate circuit are respectively connected to the output terminals of the first comparator and the second comparator electrically, and are used to output a high level or a low level at the output terminal according to the high level or low level received at the input terminal, that is, if any input terminal inputs a high level, the output terminal of the OR gate circuit outputs a high level; the control circuit triggers the alarm to give an alarm according to the high level, thus reminding the user that natural gas leakage has occurred and preventing accidents.

[0016] This device detects natural gas leakage from two dimensions of methane concentration and tetrahydrothiophene concentration, can improve the detection accuracy, detect leakage in time, and reduce potential safety hazards.

[0017] Further, the first comparator adopts a voltage comparator or a current comparator;

[0018] The second comparator adopts a voltage comparator or a current comparator.

[0019] Beneficial effects: The methane sensor and the tetrahydrothiophene sensor can output methane concentration signals and tetrahydrothiophene concentration signals, which can be voltage signals or current signals, to represent the methane concentration and the tetrahydrothiophene concentration. The comparator uses a voltage comparator or a current comparator, takes the corresponding concentration threshold as the reference signal for comparison, and outputs a high level or a low level representing the comparison result.

[0020] Further, the controller is further configured to receive the methane concentration signal and the tetrahydrothiophene concentration signal, and trigger the alarm to give an alarm according to the methane concentration signal and the tetrahydrothiophene concentration signal.

[0021] Beneficial effects: The controller can also trigger the alarm to give an alarm only when both the methane concentration and the tetrahydrothiophene concentration exceed the standard, improving the accuracy of the alarm.

[0022] Further, the controller further includes: an AND gate circuit, a first double-throw switch, and a second double-throw switch;

[0023] Two input terminals of the AND gate circuit are respectively connected to the output terminals of the first comparator and the second comparator, and are configured to output a high level or a low level according to the high level or low level received at the input terminals.

[0024] The control circuit is connected to the output terminal of the AND gate circuit and triggers the alarm to give an alarm according to the high level.

[0025] The first double-throw switch is respectively connected to an input terminal of the OR gate circuit and an input terminal of the AND gate circuit, wherein the moving terminal of the first double-throw switch is connected to the output terminal of the first comparator, and the two fixed terminals of the first double-throw switch are respectively connected to an input terminal of the OR gate circuit and an input terminal of the AND gate circuit.

[0026] The second double-throw switch is respectively connected to the other input terminal of the OR gate circuit and the other input terminal of the AND gate circuit, wherein the moving terminal of the second double-throw switch is connected to the output terminal of the second comparator, and the two fixed terminals of the second double-throw switch are respectively connected to the other input terminal of the OR gate circuit and the other input terminal of the AND gate circuit.

[0027] Beneficial effects: The first double-throw switch and the second double-throw switch can control whether the first comparator and the second comparator are connected to the OR gate circuit or the AND gate circuit, thereby switching the judgment mode of the controller, that is, whether to give an early warning when any one of the methane concentration or the tetrahydrothiophene concentration exceeds the standard, or to give an early warning only when both the methane concentration and the tetrahydrothiophene concentration exceed the standard, to meet different early warning requirements.

[0028] Further, it further includes: a first wireless communication module and a second wireless communication module;

[0029] The methane sensor is electrically connected to the first wireless communication module, and sends the methane concentration signal to the controller through the first wireless communication module;

[0030] The tetrahydrothiophene sensor is electrically connected to the second wireless communication module, and sends the tetrahydrothiophene concentration signal to the controller through the second wireless communication module.

[0031] Beneficial effects: By transmitting signals through the wireless communication module, the controller and the sensor can be placed separately, facilitating the installation of the device according to the actual environment.

[0032] Further, it further includes: a third wireless communication module;

[0033] The controller is electrically connected to the third wireless communication module and receives the methane concentration signal and the tetrahydrothiophene concentration signal through the third wireless communication module.

[0034] Beneficial effects: By transmitting signals through the wireless communication module, the controller and the sensor can be placed separately, facilitating the installation of the device according to the actual environment. Description of the Drawings

[0035] Figure 1 It is a logic block diagram of the first embodiment of a natural gas leakage detection device of the present utility model;

[0036] Figure 2 It is a connection schematic diagram of an OR gate circuit, a first comparator, and a second comparator in the first embodiment of a natural gas leakage detection device of the present utility model;

[0037] Figure 3 It is a connection schematic diagram of an OR gate circuit, an AND gate circuit, a first comparator, and a second comparator in the second embodiment of a natural gas leakage detection device of the present utility model. Detailed Embodiment

[0038] The following is further detailed through specific embodiments:

[0039] The reference numerals in the accompanying drawings of the specification include: a first comparator 1, a second comparator 2, an OR gate circuit 3, an AND gate circuit 4, a first double-throw switch 5, and a second double-throw switch 6.

[0040] In the description of the present application, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In the description of this specification, it should be understood that the orientation terms such as "upper", "lower", "left", "right", etc. described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above", "below", "left" or "right" to another element, it can not only be directly connected "above", "below", "left" or "right" to another element, but also be indirectly connected "above", "below", "left" or "right" to another element through an intermediate element.

[0042] Embodiment 1

[0043] The embodiment is basically as shown in the attached Figure 1 drawing: A natural gas leakage detection device includes: a methane sensor, a tetrahydrothiophene sensor, a controller, and an alarm;

[0044] The methane sensor, the tetrahydrothiophene sensor, and the alarm are all electrically connected to the controller;

[0045] The methane sensor is used to detect the methane concentration in the monitoring area, generate a methane concentration signal, and send it to the controller. In this embodiment, the methane sensor adopts SYS-CC001;

[0046] The tetrahydrothiophene sensor is used to detect the tetrahydrothiophene concentration in the monitoring area, generate a tetrahydrothiophene concentration signal, and send it to the controller. In this embodiment, the tetrahydrothiophene sensor adopts 4THT-50;

[0047] The controller is used to receive the methane concentration signal and the tetrahydrothiophene concentration signal, and trigger the alarm to give an alarm according to the methane concentration signal or the tetrahydrothiophene concentration signal;

[0048] The controller includes: a control circuit, an OR gate circuit 3, a first comparator 1, and a second comparator 2; among them, the control circuit adopts a single-chip microcomputer of the STM32 series;

[0049] As Figure 2As shown in the figure, the input end of the first comparator 1 inputs the methane concentration signal, which is compared with the first basic signal. The output end outputs a high level or a low level according to the comparison result. That is, if the methane concentration in the monitored area is greater than the preset upper limit of the methane concentration, the output end outputs a high level; otherwise, it outputs a low level. The first comparator 1 adopts a voltage comparator or a current comparator. In this embodiment, a voltage comparator is adopted. The corresponding concentration threshold is used as the basic signal for comparison, and a high level or a low level representing the comparison result is output.

[0050] The input end of the second comparator 2 inputs the tetrahydrothiophene concentration signal, which is compared with the second basic signal. The output end outputs a high level or a low level according to the comparison result. That is, if the tetrahydrothiophene concentration in the monitored area is greater than the preset upper limit of the tetrahydrothiophene concentration, the output end outputs a high level; otherwise, it outputs a low level. The second comparator 2 adopts a voltage comparator or a current comparator. In this embodiment, a voltage comparator is adopted.

[0051] The two input ends of the OR gate circuit 3 are respectively connected to the output ends of the first comparator 1 and the second comparator 2. It is used to output a high level or a low level according to the high level or low level received by the input ends. If any input end inputs a high level, the output end of the OR gate circuit 3 outputs a high level.

[0052] The control circuit is connected to the output end of the OR gate circuit 3 and triggers the alarm to alarm according to the high level. In this embodiment, the alarm adopts an audible and visual alarm. In other embodiments, the alarm can adopt an alarm capable of sending information, such as the GRM230 / GRM530 module.

[0053] This device detects the leakage of natural gas from two dimensions of methane concentration and tetrahydrothiophene concentration, which can improve the detection accuracy, timely detect leakage, and reduce potential safety hazards.

[0054] Embodiment 2

[0055] This embodiment is basically the same as the above embodiment, except that the controller is further configured to receive the methane concentration signal and the tetrahydrothiophene concentration signal, and trigger the alarm to alarm according to the methane concentration signal and the tetrahydrothiophene concentration signal, that is, the alarm is triggered only when both the methane concentration and the tetrahydrothiophene concentration exceed the standard, so as to improve the accuracy of the alarm.

[0056] Specifically, the controller further includes: an AND gate circuit 4, a first double-throw switch 5, and a second double-throw switch 6.

[0057] The two input ends of the AND gate circuit 4 are respectively connected to the output ends of the first comparator 1 and the second comparator 2. It is used to output a high level or a low level according to the high level or low level received by the input ends. That is, if both input ends of the AND gate circuit 4 input high levels, the output end outputs a high level; otherwise, it outputs a low level.

[0058] A control circuit, connected to the output terminal of the AND gate circuit 4, triggers the alarm to give an alarm according to a high level;

[0059] As Figure 3 shown, the first double-throw switch 5 is respectively connected to an input terminal of the OR gate circuit 3 and an input terminal of the AND gate circuit 4. The moving terminal of the first double-throw switch 5 is connected to the output terminal of the first comparator 1, and the two fixed terminals of the first double-throw switch 5 are respectively connected to an input terminal of the OR gate circuit 3 and an input terminal of the AND gate circuit 4;

[0060] The second double-throw switch 6 is respectively connected to the other input terminal of the OR gate circuit 3 and the other input terminal of the AND gate circuit 4. The moving terminal of the second double-throw switch 6 is connected to the output terminal of the second comparator 2, and the two fixed terminals of the second double-throw switch 6 are respectively connected to the other input terminal of the OR gate circuit 3 and the other input terminal of the AND gate circuit 4;

[0061] The first double-throw switch 5 and the second double-throw switch 6 can control whether the first comparator 1 and the second comparator 2 are connected to the OR gate circuit 3 or the AND gate circuit 4, so as to switch the judgment mode of the controller, that is, to give an early warning when any one of the methane concentration or the tetrahydrothiophene concentration exceeds the standard, or to give an early warning only when both the methane concentration and the tetrahydrothiophene concentration exceed the standard, so as to meet different early warning requirements.

[0062] Embodiment III

[0063] This embodiment is basically the same as the above embodiment, except that it further includes: a first wireless communication module, a second wireless communication module, and a third wireless communication module;

[0064] A methane sensor, electrically connected to the first wireless communication module, and sends the methane concentration signal to the controller through the first wireless communication module;

[0065] A tetrahydrothiophene sensor, electrically connected to the second wireless communication module, and sends the tetrahydrothiophene concentration signal to the controller through the second wireless communication module;

[0066] A controller, electrically connected to the third wireless communication module, and receives the methane concentration signal and the tetrahydrothiophene concentration signal through the third wireless communication module;

[0067] Wherein the first wireless communication module, the second wireless communication module, and the third wireless communication module adopt a wifi communication module, a Bluetooth communication model, a 3G communication module, etc.; in this embodiment, the wifi communication module ESP8266 is adopted.

[0068] By transmitting signals through the wireless communication module, the controller and the sensor can be placed separately, which is convenient for installing this device according to the actual environment.

[0069] The above are only embodiments of the present utility model. Specific structures and common knowledge such as characteristics that are well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model pertains before the filing date or the priority date, can know all the existing technologies in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to complete and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A natural gas leak detection device, characterized in that: include: Methane sensors, tetrahydrothiophene sensors, controllers and alarms; The methane sensor is used to detect the methane concentration in the monitoring area, generate a methane concentration signal, and send it to the controller; The tetrahydrothiophene sensor is used to detect the tetrahydrothiophene concentration in the monitoring area, generate a tetrahydrothiophene concentration signal, and send it to the controller; The controller is used to receive a methane concentration signal and a tetrahydrothiophene concentration signal, and trigger an alarm to sound an alarm according to the methane concentration signal or the tetrahydrothiophene concentration signal; The controller comprises: a control circuit, an OR gate circuit, a first comparator and a second comparator; The first comparator inputs a methane concentration signal to an input terminal, compares it with the first basic signal, and outputs a high level or a low level according to the comparison result; The second comparator inputs a tetrahydrothiophene concentration signal to an input terminal, compares it with the second basic signal, and outputs a high level or a low level according to the comparison result; The two input terminals of the OR gate circuit are respectively connected to the output terminals of the first comparator and the second comparator, and are used for the output terminal to output a high level or a low level according to the high level or the low level received by the input terminal; The control circuit is connected to the output end of the OR gate circuit, and triggers the alarm to sound an alarm according to the high level.

2. The natural gas leak detection device according to claim 1, characterized in that: The first comparator is a voltage comparator or a current comparator; The second comparator is a voltage comparator or a current comparator.

3. The natural gas leak detection device according to claim 1, characterized in that: The controller is also used to receive a methane concentration signal and a tetrahydrothiophene concentration signal, and trigger an alarm to sound an alarm according to the methane concentration signal and the tetrahydrothiophene concentration signal.

4. The natural gas leak detection device according to claim 3, characterized in that: The controller further includes: an AND gate circuit, a first double-throw switch and a second double-throw switch; The two input terminals of the AND gate circuit are respectively connected to the output terminals of the first comparator and the second comparator, and are used for the output terminal to output a high level or a low level according to the high level or the low level received by the input terminal; The control circuit is connected to the output end of the AND gate circuit, and triggers the alarm to sound an alarm according to the high level; The first double-throw switch is respectively connected to an input terminal of the OR gate circuit and an input terminal of the AND gate circuit, wherein the movable terminal of the first double-throw switch is connected to the output terminal of the first comparator, and the two fixed terminals of the first double-throw switch are respectively connected to an input terminal of the OR gate circuit and an input terminal of the AND gate circuit; The second double-throw switch is respectively connected to the other input end of the OR gate circuit and the other input end of the AND gate circuit, wherein the moving end of the second double-throw switch is connected to the output end of the second comparator, and the two fixed ends of the second double-throw switch are respectively connected to the other input end of the OR gate circuit and the other input end of the AND gate circuit.

5. The natural gas leak detection device according to claim 1, characterized in that: Also includes: A first wireless communication module and a second wireless communication module; The methane sensor is electrically connected to the first wireless communication module, and sends a methane concentration signal to the controller through the first wireless communication module; The tetrahydrothiophene sensor is electrically connected to the second wireless communication module, and sends the tetrahydrothiophene concentration signal to the controller through the second wireless communication module.

6. The natural gas leak detection device according to claim 1, characterized in that: Also includes: A third wireless communication module; The controller is electrically connected to the third wireless communication module, and receives the methane concentration signal and the tetrahydrothiophene concentration signal through the third wireless communication module.

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