Gas pipeline electric leakage alarm device based on intrinsic safety explosion prevention

Abstract

The invention relates to the technical field of fuel gas devices, in particular to a fuel gas pipeline electric leakage alarm device based on intrinsic safety explosion prevention. A first metal connector and a second metal connector are arranged at the two ends of a pipe body correspondingly; and the first metal joint and the second metal joint are electrically connected with the output port and the input port on the circuit board through the second conductive element and the first conductive element respectively. According to the invention, the two metal joints for connecting the gas appliance and the gas pipeline are electrically isolated through the pipe body; the potential difference between the two metal joints is monitored through multiple current limiting circuits (a first current limiting branch and a second current limiting branch) arranged on the PCB, and when the potential difference exceeds an activation threshold value, the micro current (according with the intrinsic safety explosion-proof standard) flowing through the multiple current limiting circuits is utilized, and a resistor arranged on the alarm circuit is used for voltage division to drive the alarm device to send out a signal, so that the safety of the metal joints is ensured. Therefore, the alarm function is realized, and the current in the whole circuit can be always kept within the standard required by intrinsic safety explosion-proof at the same time.

Description

Technical Field

[0001] This invention relates to the field of gas appliance technology, specifically to an intrinsically safe and explosion-proof gas pipeline leakage alarm device. Background Technology

[0002] Intrinsically safe explosion-proof standards are safety specifications for electrical equipment designed for explosive environments (such as places containing flammable gases and dust, commonly found in chemical, petroleum, and mining industries). Their core logic is to "control risks at the source" by limiting the energy (electrical and thermal energy) of equipment and circuits to ensure that the electrical sparks and thermal effects generated under normal or fault conditions are insufficient to ignite the surrounding explosive mixture, thereby eliminating the risk of explosion in essence.

[0003] In the field of gas equipment and pipelines, intrinsic safety and explosion protection are essential core designs due to the presence of flammable gases. Among these, leakage current alarm devices are crucial equipment. When leakage occurs in electrical equipment within gas equipment and pipelines, alarms are triggered according to intrinsic safety and explosion protection standards to prevent major safety hazards.

[0004] Existing leakage current alarm devices and circuits typically use a single high-resistance resistor of ≥50MΩ connected in series with an LED alarm light to achieve the leakage current alarm function. However, in actual applications, if the resistor short-circuits, the leakage current will increase dramatically, posing a significant risk of electric shock and explosion. Conversely, if the resistor fails and breaks the circuit, the alarm function will be ineffective, further increasing the safety hazard. Moreover, such circuit structures are relatively simple and cannot meet the intrinsically safe explosion-proof standard requirements.

[0005] Based on the above reasons, this invention designs an intrinsically safe explosion-proof gas pipeline leakage alarm device. By combining series and parallel resistors with multiple current limiting designs, it ensures that even if the current limiting components experience short circuits or open circuits, the leakage current is still limited to a safe range (≤200μA), while maintaining the effective alarm function. This meets the intrinsically safe explosion-proof standard and ensures the safety of high-risk locations. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intrinsically safe explosion-proof gas pipeline leakage alarm device. By combining series and parallel resistors with multiple current limiting designs, it ensures that even if the current limiting components experience short circuits or open circuits, the leakage current is still limited to a safe range (≤200μA), while maintaining the effective alarm function. This meets the intrinsically safe explosion-proof standard and ensures the safety of high-altitude locations.

[0007] To achieve the above objectives, the present invention provides an intrinsically safe explosion-proof gas pipeline leakage alarm device, comprising a pipe body, with a first metal connector and a second metal connector respectively provided at both ends of the pipe body. The first metal connector and the second metal connector are electrically connected to the output port and the input port on the circuit board through a second conductive element and a first conductive element, respectively.

[0008] The input port is connected in series with the first current limiting branch, the first current limiting branch is connected in series with the alarm circuit, the alarm circuit is connected in series with the second current limiting branch, the second current limiting branch is connected in series to the output port, and an alarm device is connected in parallel to the alarm circuit.

[0009] The first current-limiting branch, the second current-limiting branch, and the alarm circuit are all equipped with two or more resistors connected in parallel.

[0010] The alarm device is a light-emitting diode or a buzzer, with the light-emitting diodes connected in parallel and reversed.

[0011] The circuit board is set in a reserved cavity on the tube body protected by a cover plate. The cover plate is provided with a transparent observation hole. The second conductive element and the first conductive element are metal elastic parts, and the tube body is a plastic-lined tube body.

[0012] Compared with the prior art, the present invention provides electrical isolation between the two metal joints connecting the gas appliance and the gas pipeline through the pipe body. The potential difference between the two metal joints is monitored by the multiple current limiting circuits (first and second current limiting branches) set on the PCB circuit board. When the potential difference exceeds the activation threshold, the small current flowing through the multiple current limiting circuits (which meets the intrinsic safety and explosion-proof standards) drives the alarm device to send a signal through the voltage division of the resistor set on the alarm circuit, thereby realizing the alarm function. At the same time, it can ensure that the current in the overall circuit is always kept within the intrinsic safety and explosion-proof standard. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of the device of the present invention.

[0014] Figure 2 This is a circuit diagram of Embodiment 1 of the present invention.

[0015] Figure 3 This is a circuit diagram of Embodiment 2 of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Tube body, 2. First metal connector, 3. Second metal connector, 4. Circuit board, 5. Cover plate, 6. Transparent observation hole, 7. First conductive element, 8. Second conductive element, 9. Input port, 10. Output port, 11. Resistor 1, 12. Resistor 2, 13. Resistor 3, 14. Resistor 4, 15. First light-emitting diode, 16. Second light-emitting diode, 17. Resistor 5, 18. Resistor 6, 19. Buzzer 1, 20. Buzzer 2. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings. Example

[0018] See Figure 1 , Figure 2 The present invention provides an intrinsically safe explosion-proof gas pipeline leakage alarm device, including a pipe body 1, with a first metal connector 2 and a second metal connector 3 respectively provided at both ends of the pipe body 1. The first metal connector 2 and the second metal connector 3 are electrically connected to the output port 10 and the input port 9 on the circuit board 4 through a second conductive element 8 and a first conductive element 7 respectively.

[0019] Input port 9 is connected in series with the first current limiting branch, the first current limiting branch is connected in series with the alarm circuit, the alarm circuit is connected in series with the second current limiting branch, the second current limiting branch is connected in series to output port 10, and an alarm device is connected in parallel on the alarm circuit.

[0020] The first current-limiting branch consists of resistors 11 and 12 connected in parallel, the second current-limiting branch consists of resistors 17 and 18 connected in parallel, the alarm circuit consists of resistors 13 and 14 connected in parallel, and the alarm device consists of a first light-emitting diode 15 and a second light-emitting diode 16 connected in parallel and reversed (for bidirectional potential difference alarm), or one of them can be selected.

[0021] The circuit board 4 is set in a reserved cavity on the tube body 1 protected by a cover plate 5, and the cover plate 5 is provided with a transparent observation hole 6. The second conductive element 8 and the first conductive element 7 are metal elastic components, and the tube body 1 can be a plastic-lined tube body. Example

[0022] See Figure 1 , Figure 3 The present invention provides an intrinsically safe explosion-proof gas pipeline leakage alarm device, including a pipe body 1, with a first metal connector 2 and a second metal connector 3 respectively provided at both ends of the pipe body 1. The first metal connector 2 and the second metal connector 3 are electrically connected to the output port 10 and the input port 9 on the circuit board 4 through a second conductive element 8 and a first conductive element 7 respectively.

[0023] Input port 9 is connected in series with the first current limiting branch, the first current limiting branch is connected in series with the alarm circuit, the alarm circuit is connected in series with the second current limiting branch, the second current limiting branch is connected in series to output port 10, and an alarm device is connected in parallel on the alarm circuit.

[0024] The first current-limiting branch consists of resistors 11 and 12 connected in parallel, the second current-limiting branch consists of resistors 17 and 18 connected in parallel, the alarm circuit consists of resistors 13 and 14 connected in parallel, and the alarm device consists of buzzers 19 and 20 connected in parallel, or one of them can be selected.

[0025] The circuit board 4 is set in a reserved cavity on the tube body 1 protected by a cover plate 5, and the cover plate 5 is provided with a transparent observation hole 6. The second conductive element 8 and the first conductive element 7 are metal elastic components, and the tube body 1 can be a plastic-lined tube body.

[0026] Working principle: See Figures 1-3 This invention requires minimal debugging. The first metal connector 2 and the second metal connector 3 are fixed to both ends of the pipe body 1, respectively. The input port 9 of the leakage current alarm circuit is electrically connected to the first metal connector 2 through the first conductive element 7, and the output port 10 of the leakage current alarm circuit is electrically connected to the second metal connector 3 through the second conductive element 8. The pipe body 1 is an insulated pipe body, providing electrical isolation between the first metal connector 2 and the second metal connector 3 that connect the gas appliance and the gas pipeline. The first and second current-limiting branches form a multi-current-limiting network. When any resistor in the first or second current-limiting branch experiences a short circuit or open circuit fault, the input port 9 and the output port 10 will form a potential difference with the corresponding other end (household maximum 220V, maximum 380V). The current flowing through the alarm circuit is limited to below a safe value, and the alarm device is driven to emit an alarm signal (the current required by the alarm device is very small, generally only 20μA is needed to light it up). The total resistance of the resistors in the first and second current-limiting branches is a fixed value, which limits the maximum possible short circuit current to below 200 microamps (μA) under the action of 220V AC power.

[0027] The above are merely preferred embodiments of the present invention, intended only to aid in understanding the method and core ideas of this application. The scope of protection of the present invention is not limited to the above embodiments; all technical solutions falling within the scope of the present invention's concept are within its protection. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

[0028] This invention comprehensively solves the shortcomings of existing technologies that rely solely on a single high-resistance resistor connected in series with an LED light for leakage current alarms. These shortcomings include the risk of electric shock and explosion caused by a surge in leakage current due to a short circuit in the resistor, as well as the amplification of safety hazards caused by alarm function failure due to a short circuit. By combining multiple resistors in series and parallel with multiple current-limiting designs, along with alarm lights or buzzers, this invention ensures that even if a component experiences a short circuit or open circuit fault, the leakage current remains within a safe range without affecting the stability of the alarm function. This maintains the intrinsically safe and explosion-proof standards and guarantees safety in high-risk scenarios.

Claims

1. A gas pipeline leakage alarm device based on intrinsically safe explosion-proof design, comprising a pipe body (1), characterized in that, The tube body (1) is provided with a first metal connector (2) and a second metal connector (3) at both ends. The first metal connector (2) and the second metal connector (3) are electrically connected to the output port (10) and the input port (9) on the circuit board (4) through the second conductive element (8) and the first conductive element (7), respectively.

2. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 1, characterized in that, The input port (9) is connected in series with the first current limiting branch, the first current limiting branch is connected in series with the alarm circuit, the alarm circuit is connected in series with the second current limiting branch, the second current limiting branch is connected in series to the output port (10), and an alarm device is connected in parallel to the alarm circuit.

3. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 2, characterized in that, The first current-limiting branch, the second current-limiting branch, and the alarm circuit are all equipped with two or more resistors connected in parallel.

4. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 3, characterized in that, The alarm device is a light-emitting diode or a buzzer.

5. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 4, characterized in that, The light-emitting diodes are connected in parallel and reversed.

6. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 1, characterized in that, The circuit board (4) is placed in a reserved cavity on the tube body (1) protected by a cover plate (5).

7. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 6, characterized in that, The cover plate (5) is provided with a transparent observation hole (6).

8. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 7, characterized in that, The second conductive element (8) and the first conductive element (7) are metal elastic components.

9. The intrinsically safe explosion-proof gas pipeline leakage alarm device according to claim 1, characterized in that, The pipe body (1) is a plastic-lined pipe body.

Images