A method for leakage alarm of gas pipeline

Abstract

A method for leakage alarm of gas pipeline. In this leakage alarm method, two metal joints are respectively connected to the metal pipeline of the gas appliance and the metal gas inlet pipe. A plastic part is used to connect between the two metal joints to achieve electrical insulation in case of gas pipeline leakage. And an alarm device for gas pipeline leakage is connected between the two metal joints. The alarm device has no power supply, and the potential difference between the metal pipeline of the gas appliance and the metal gas inlet pipe connected by the two metal joints triggers the alarm device to give an alarm. The present invention uses a plastic part to connect the two metal joints, so that even if the gas pipeline leaks, there will be no problem of leakage and fire. Furthermore, through the alarm device without a power supply, as long as the potential difference reaches the specified range, the technical effect of giving an alarm can be achieved, solving the problem that it is difficult to detect gas pipeline leakage.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas pipeline alarm, and particularly relates to a leakage alarm method for gas pipelines. Background Art

[0002] Currently, most of the alarms for gas pipelines on the market focus on gas leakage alarms, without leakage alarms or without paying attention to leakage alarms, and there is also a lack of relevant technical means. How to achieve an alarm for the leakage problem in gas pipelines is the research object of those skilled in the art. Summary of the Invention

[0003] The present invention provides a leakage alarm method for gas pipelines with a simple structure, good safety performance, obvious alarm and insulation effects.

[0004] A leakage alarm method for gas pipelines. The leakage alarm method uses two metal joints to connect the metal pipeline of the gas appliance and the metal gas inlet pipe respectively. A plastic part is used to connect between the two metal joints to achieve leakage insulation of the gas pipeline. And an alarm device for gas pipeline leakage is connected between the two metal joints. The alarm device has no power supply, and the potential difference between the metal pipeline of the gas appliance and the metal gas inlet pipe connected by the two metal joints triggers the alarm device to alarm. Preferably, the two metal joints of this kind of leakage alarm method for gas pipelines are made of leaded brass, and the middle plastic part is flame-retardant high-density polypropylene, which is processed by an injection molding process. The principle of this product is that between the two metal joints at both ends of the product, an alarm device with an alarm function is connected. During the normal use of the gas pipeline, when the alarm device detects a potential difference that is harmful to the pipeline between the two metal joints at both ends, its warning light will be lit. For safety, the alarm device itself has no power supply, and it uses the detected potential difference to activate the warning light or buzzer, thus generating an alarm effect.

[0005] The alarm device includes a first electrode and a second electrode. An alarm circuit is connected between the first electrode and the second electrode. The alarm circuit includes at least one or both of an LED lamp and a buzzer. The LED lamp or the buzzer is triggered by the potential difference between the first electrode and the second electrode. The first electrode is connected to the metal pipeline of the gas appliance through the corresponding metal joint, and the second electrode is connected to the metal gas inlet pipe through the corresponding metal joint.

[0006] The alarm circuit includes a first rectifier diode, a first resistor, and a first LED lamp connected in series. The first resistor ≥ 50 megohms. Because the circuit is designed to have a very large impedance, it can normally block the current and give a light alarm.

[0007] The described alarm circuit includes a first electrode, a first rectifier diode, a first resistor, a first LED light, a second electrode, a second LED light, a second resistor, a second rectifier diode, and the first electrode that are connected in series to form a loop. This kind of alarm circuit formed by series connection has no conflict with the original gas pipeline design, and is suitable for installing multiple devices that alarm using the method of the present invention in a gas pipeline. Moreover, regardless of the installation direction, the lighting effects of the first LED light and the second LED light can be achieved, and the problem that the LED light does not light up due to the high and low directions of the potential difference between the first electrode and the second electrode will not occur. During the installation process, the first rectifier diode and the second rectifier diode are installed with opposite polarities, and the first LED light and the second LED light are installed with opposite polarities.

[0008] The described alarm circuit includes a PLC central processor connected to a power processor, and the PLC central processor controls a buzzer and an LED light. When the potential difference between the first electrode and the second electrode of the alarm device reaches above 10V and below 450V, the current will output a suitable and stable voltage to the PLC central processor through the power processor, and the PLC central processor will activate the buzzer and the LED light to give an alarm.

[0009] The first electrode, the second electrode, and the alarm circuit are arranged on a circuit board. The first electrode is connected to a first metal joint through a first metal spring, and the second electrode is connected to a second metal joint through a second metal spring. The first metal spring is installed in a first installation hole inside the plastic part, and the second metal spring is installed in a second installation hole inside the plastic part. The first metal spring and the second metal spring ensure the contact performance between the first electrode and the first metal joint, and between the second electrode and the second metal joint under different working conditions.

[0010] Both ends of the described plastic part are injection-molded to connect two metal joints, namely a first metal joint and a second metal joint. There is an installation hole in the middle of the plastic part, and a transparent end cover is provided on the outer side of the installation hole. The installation hole is used to install the alarm device, and the transparent end cover is convenient for observing the alarm signal.

[0011] The activation voltage for the potential difference to trigger the alarm device to give an alarm is between 12V and 450V. Since the circuit is designed to have a very large impedance (resistance ≥ 50 megohms), it can normally block the current and give a light alarm.

[0012] The described second metal joint is an external thread joint, and the external thread joint is provided with a second limiting groove for injection-molding connection with the plastic part. The described first metal joint is an internal thread joint, and the internal thread joint is provided with a first limiting groove for injection-molding connection with the plastic part, which overall improves the connection firmness.

[0013] One of the two metal joints is an extended joint with a flanging. The extended joint is provided with a third limiting groove and an extended section. An adjusting nut is arranged on the outer periphery of the extended section, which improves the convenience of connection.

[0014] In the present invention, two metal joints are connected by a plastic part, so that even if the gas pipeline leaks electricity, there will be no problem of leakage and fire. Further, through an alarm device without power supply, as long as the potential difference reaches the specified range, the alarm can be realized, solving the problem that it is difficult to detect the leakage of the gas pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the drawings:

[0016] Figure 1 It is a schematic cross-sectional structure view of the alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0017] Figure 2 It is a schematic side view structure view of the alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0018] Figure 3 It is a schematic front view structure view of the alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0019] Figure 4 It is a schematic three-dimensional structure view of the first metal joint in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0020] Figure 5 It is a schematic three-dimensional structure view of the second metal joint in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0021] Figure 6 It is a schematic three-dimensional structure view of a metal joint in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0022] Figure 7 It is a schematic three-dimensional structure view of the plastic part in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0023] Figure 8 It is a schematic three-dimensional structure view of an alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0024] Figure 9 It is a schematic three-dimensional structure view of another alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0025] Figure 10 It is a schematic three-dimensional structure view of another alarm device in a method for detecting electric leakage of a gas pipeline according to the present invention;

[0026] Figure 11Schematic diagram of an alarm circuit in a leakage alarm method for a gas pipeline according to the present invention;

[0027] Figure 12 Schematic diagram of another alarm circuit in a leakage alarm method for a gas pipeline according to the present invention;

[0028] Figure 13 Schematic diagram of another alarm circuit in a leakage alarm method for a gas pipeline according to the present invention. Detailed implementation manners

[0029] The following combines the attached Figures 1-13 Detailed implementation manners to further elaborate on the technical solutions of this patent.

[0030] Embodiment 1 A leakage alarm method for a gas pipeline, using two metal joints to connect the metal pipeline of a gas appliance and the metal gas inlet pipe respectively. A plastic part 2 is used to connect between the two metal joints to achieve electrical insulation for gas pipeline leakage. And an alarm device for gas pipeline leakage is connected between the two metal joints. The alarm device is not powered. The potential difference between the metal pipeline of the gas appliance and the metal gas inlet pipe connected by the two metal joints triggers the alarm device to alarm. The activation voltage for the potential difference to trigger the alarm device to alarm is between 12V - 450V. When the alarm device detects leakage of the gas appliance, it emits a light warning and the plastic part 2 blocks the current, avoiding gas explosion accidents caused by the leakage of the gas appliance with strong electricity breaking through the metal gas inlet pipe such as a stainless steel corrugated pipe, and also avoiding gas appliance failures caused by the high-voltage static electricity generated by the gas and the pipeline breaking through the circuit board of the gas appliance.

[0031] As a structural preference, the alarm device includes a first electrode 16 connected to the metal pipeline of the gas appliance and a second electrode 17 connected to the metal gas inlet pipe. An alarm circuit is connected between the first electrode 16 and the second electrode 17. The alarm circuit includes at least one or both of an LED lamp and a buzzer. The LED lamp or the buzzer is triggered by the potential difference between the first electrode and the second electrode.

[0032] Embodiment 2 On the basis that other methods are the same as those in Embodiment 1, the alarm circuit includes a first rectifier diode 19, a first resistor 18, and a first LED lamp 20 connected in series. Specifically, the first electrode 16 is electrically connected to the first rectifier diode 19, the first rectifier diode 19 is electrically connected to the first resistor 18, the first resistor 18 is electrically connected to the first LED lamp 20, and the first LED lamp 20 is electrically connected to the second electrode 17. The resistance of the first resistor 18 is ≥ 50 megaohms. The alarm circuit is designed to have a very large impedance, so it can normally block the current and emit a light alarm when the first LED lamp 20 lights up when a set potential difference appears between the first electrode 16 and the second electrode 17, indicating that there is a leakage problem in the gas pipeline.

[0033] Embodiment 3 On the basis that other methods are the same as those in Embodiment 1, the alarm circuit includes a first electrode 16, a first rectifying diode 19, a first resistor 18, a first LED lamp 20, a second electrode 17, a second LED lamp 21, a second resistor 22, a second rectifying diode 23, and a first electrode 16 that are connected in series to form a loop. Specifically, the first electrode 16 is electrically connected to the first rectifying diode 19, the first rectifying diode 19 is electrically connected to the first resistor 18, the first resistor 18 is electrically connected to the first LED lamp 20, the first LED lamp 20 is electrically connected to the second electrode 17, the second electrode 17 is electrically connected to the second LED lamp 21, the second LED lamp 21 is electrically connected to the second resistor 22, the second resistor 22 is electrically connected to the second rectifying diode 23, and the second rectifying diode 23 is electrically connected to the first electrode 16. Among them, the resistance of the first resistor 18 and the second resistor 22 is ≥ 50 megohms. The alarm circuit is designed to have a very large impedance, so it can normally block the current and emit a light alarm with the first LED lamp 20 and the second LED lamp 21 lighting up when a set potential difference appears between the first electrode 16 and the second electrode 17, indicating that there is a leakage problem in the gas pipeline. In this circuit structure, the positive and negative polarities of the first LED lamp 20 and the second LED lamp 21 are opposite with respect to the first electrode 16 and the second electrode 17, and the positive and negative polarities of the first resistor 18 and the second resistor 22 are opposite with respect to the first electrode 16 and the second electrode 17. Therefore, regardless of the potential levels of the first electrode 16 and the second electrode 17, as long as a set potential difference appears, a light alarm with the first LED lamp 20 and the second LED lamp 21 lighting up can be realized, indicating that there is a leakage problem in the gas pipeline, and it can be installed at any pipeline node and in any quantity between the gas inlet riser and the gas appliance.

[0034] Embodiment 4 On the basis that other methods are the same as those in Embodiment 1, the alarm circuit includes a PLC central processor 28 connected to a power supply processor 25, and the PLC central processor 28 controls a buzzer 27 and an LED lamp 29. Specifically, the first electrode 16 is electrically connected to the power supply processor 25, and the power supply processor 25 is electrically connected to the second electrode 17. When a set potential difference appears between the first electrode 16 and the second electrode 17, the power supply processor 25 outputs a suitable and stable voltage to the PLC central processor, and the PLC central processor will activate the buzzer and the LED lamp to emit a light alarm and a sound alarm, indicating that there is a leakage problem in the gas pipeline.

[0035] As an alarm device in the leakage alarm method for the gas pipeline of the present invention, the first electrode 16, the second electrode 17, and the alarm circuit are provided on a circuit board 5. The first electrode 16 is connected to a first metal joint 8 through a first metal spring 7, and the second electrode 17 is connected to a second metal joint 3 through a second metal spring 4. The first metal spring 7 is installed in a first mounting hole 13 in a plastic part 2, and the second metal spring 4 is installed in a second mounting hole 33 in the plastic part 2.

[0036] As a structural preference, both ends of the plastic part 2 are injection-molded to connect two metal joints, namely the first metal joint 8 and the second metal joint 3. An installation hole 1 is provided in the middle of the plastic part 2, and a transparent end cap 6 is provided on the outer side of the installation hole 1. The second metal joint 3 is an external thread joint, and the external thread joint is provided with a second limiting groove 10 for injection-molding connection with the plastic part 2. The first metal joint 8 is an internal thread joint, and the internal thread joint is provided with a first limiting groove 9 for injection-molding connection with the plastic part 2.

[0037] As a structural preference, one of the two metal joints is an extended joint 12 with a flanging. The extended joint 12 is provided with a third limiting groove 11 and an extended section, and a movable nut 15 is provided on the outer periphery of the extended section.

[0038] As a structural preference, one of the two metal joints is a nut 14 injection-molded to connect the plastic part 2.

[0039] The above has described in detail the preferred embodiments of this patent. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the gist of this patent.

Claims

1. A gas pipeline leakage alarm method, characterized by: The leakage alarm method adopts two metal joints to respectively connect the metal pipe of the gas appliance and the metal pipe of the gas intake, the two metal joints are connected by a plastic part (2) to achieve the leakage insulation of the gas pipe, and a gas pipe leakage alarm device is connected between the two metal joints, the alarm device has no power supply, and the alarm device is triggered to alarm by the potential difference between the metal pipe of the gas appliance and the metal pipe of the gas intake connected by the two metal joints; the alarm device comprises a first electrode (16) and a second electrode (17), an alarm circuit is connected between the first electrode (16) and the second electrode (17), the alarm circuit comprises at least one or both of an LED lamp or a buzzer, the LED lamp or the buzzer is triggered by the potential difference between the first electrode and the second electrode Triggering; the first electrode (16) and the second electrode (17) and the alarm circuit are arranged on the circuit board (5); the first electrode (16) is connected to the first metal joint (8) via the first metal spring (7); the second electrode (17) is connected to the second metal joint (3) via the second metal spring (4); the first metal spring (7) is installed in the first mounting hole (13) in the plastic part (2); the second metal spring (4) is installed in the second mounting hole (33) in the plastic part (2); two ends of the plastic part (2) are connected to two metal joints, namely the first metal joint (8) and the second metal joint (3), by injection molding; a mounting hole (1) is provided in the middle of the plastic part (2); a transparent end cover (6) is provided on the outer side of the mounting hole (1); The alarm circuit includes any of the following: An alarm circuit is a first rectifier diode, a first resistor, and a first LED lamp connected in series; Another alarm circuit is a first electrode, a first rectifier diode, a first resistor, a first LED lamp, a second electrode, a second LED lamp, a second resistor, a second rectifier diode, and a first electrode connected in series to form a loop, wherein the positive and negative poles of the first rectifier diode and the second rectifier diode are oppositely installed, and the positive and negative poles of the first LED lamp and the second LED lamp are oppositely installed; The alarm circuit includes a PLC central processor connected to a power processor, and the PLC central processor controls a buzzer and an LED light; The second metal joint (3) is an external thread joint, which is provided with a second limiting groove (10) for injection molding and connecting the plastic part (2); the first metal joint (8) is an internal thread joint, which is provided with a first limiting groove (9) for injection molding and connecting the plastic part (2); One of the two metal joints is an extended joint (12) with a flange, the extended joint (12) is provided with a third limiting groove (11) and an extended section, and a movable nut (15) is provided on the outer periphery of the extended section; the activation voltage of the potential difference triggering alarm device is between 12V and 450V.

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