A device for detecting leakage of a gas produced in a petrochemical industry

Abstract

The utility model provides a kind of petroleum chemical production gas leakage detection device, including gas pipeline, connecting upper cover and connecting lower cover, gas pipeline is provided with two, two gas pipelines are fixed between by flange and multiple bolts connection, the left and right ends of the outer portion of two gas pipelines are each equipped with sealing rubber ring, the upper and lower ends of the outer portion of two sealing rubber rings are each equipped with arc connecting plate, the design solves the original petroleum chemical safety production gas leakage detection device in alarm and switch etc. Component is set on the upper portion of pipeline, leading to its detection is not fast and sensitive enough, the utility model adopts down-type film conductive structure, when gas leakage in detection cavity leads to pressure rise, film is deformed under pressure, directly push conductive sheet and alarm circuit connection, realize instantaneous mechanical type alarm, form double redundancy with intelligent control system, significantly improve security.

Description

Technical Field

[0001] This utility model is a gas leak detection device for petrochemical production, belonging to the field of gas leak detection technology. Background Technology

[0002] With the rapid development of science and technology and society, petroleum, as one of the most important resources in today's society, is widely used in all walks of life. After being extracted, petroleum needs to be refined in chemical plants and then transported for use. Petroleum is transported through pipelines, and the transportation distance is generally quite long. For ease of installation, the pipelines are often connected by flanges. During transportation, petroleum contains a large amount of gas, and the flange connection is a very easy place for gas leaks to occur due to factors such as installation methods or quality.

[0003] Chinese patent CN221348841U discloses a gas leak detection device for petrochemical safety production. In this device, leaked gas enters between two mounting housings and flows through an outlet pipe into a detection chamber. This activates the alarm switch contacts and the electromagnet switch contacts, triggering an alarm. The electromagnet body attracts a magnetic pressure component, fixing a sealing plate in place. The sealing plate then moves above the gas delivery pipe, allowing the leaked gas to flow through the pipe into an exhaust box for further storage. The inflating gas chamber can store even more leaked gas, reducing potential safety hazards. However, existing petrochemical gas... Specifically, propane has a density approximately 1.96 times that of air, and butane has a density approximately 2.06 times that of air. Therefore, liquefied petroleum gas (LPG) is generally denser than air. This causes petrochemical gases to sink in the air and easily accumulate in low-lying areas. In this petrochemical safety gas leak detection device, the alarm switch contacts, electromagnet switch, and detection box are all located at the upper end of the pipeline. When it detects a gas leak, the housing is already filled with the leaked petrochemical gas, making the detection insensitive. There is an urgent need for a petrochemical production gas leak detection device to solve the above-mentioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a gas leak detection device for petrochemical production, thereby solving the problems mentioned in the background section. This invention adopts a bottom-mounted thin-film conductive structure. When gas leakage in the detection chamber causes a pressure increase, the thin film is deformed under pressure, directly pushing the conductive sheet to connect with the alarm circuit, thus achieving instantaneous mechanical alarm.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a gas leak detection device for petrochemical production, comprising a gas pipeline, a connecting upper cover, and a connecting lower cover. Two gas pipelines are provided, connected and fixed together by flanges and multiple bolts. Sealing rubber rings are fitted onto the left and right ends of both gas pipelines, and arc-shaped connecting plates are fitted onto the upper and lower ends of the two sealing rubber rings. The connecting upper cover and the connecting lower cover are fixed to the outside of the two gas pipelines by multiple bolts and sealing rubber sheets. An alarm module and a sensor module are respectively connected to the left and right sides of the lower end of the connecting lower cover. An infrared sensor, a PID sensor, and a catalytic combustion sensor are embedded in the sensor module. A control panel and an alarm are installed at the front end of the sensor module. A rubber insulating inner frame is fixed to the inner edge of the alarm module, and a flexible silicone membrane is disposed within the rubber insulating inner frame. A copper sheet is disposed at the lower end of the flexible silicone membrane. A first insulating block and a second insulating block are respectively installed on the left and right ends inside the alarm module. A first parallel conductive sheet and a second parallel conductive sheet are respectively embedded in the inner end faces of the first insulating block and the first insulating block.

[0006] Furthermore, the plurality of the arc-shaped connecting plates are respectively fixed to the left and right sides of the connecting upper cover and the left and right sides of the connecting lower cover.

[0007] Furthermore, a through slot is provided between the alarm module and the sensor module.

[0008] Furthermore, the surface of the flexible silicone film is coated with an antistatic coating.

[0009] Furthermore, the copper sheet is normally suspended above the gap between the first parallel conductive sheet and the second parallel conductive sheet.

[0010] Furthermore, the first parallel conductive sheet and the second parallel conductive sheet are connected to the control panel and the alarm via wires, and one end of the control panel is connected to an external power source, an infrared sensor, a PID sensor and a catalytic combustion sensor via a data line.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a gas leak detection device for petrochemical production. Because it incorporates an alarm module, sensor module, control panel, infrared sensor, PID sensor, catalytic combustion sensor, rubber insulating inner frame, flexible silicone membrane, copper sheet, first insulating block, first parallel conductive sheet, second insulating block, second parallel conductive sheet, and alarm, its structure is reasonable. It adopts a bottom-mounted thin-film conductive structure. When gas leakage in the detection chamber causes pressure to rise, the membrane deforms under pressure, directly pushing the conductive sheet to connect with the alarm circuit, achieving instantaneous mechanical alarm (response time ≤ 2 seconds). This forms dual redundancy with the intelligent control system, significantly improving safety and making it highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a petrochemical production gas leak detection device according to the present invention; Figure 2 This is a schematic diagram of the alarm module and sensor module of a petrochemical production gas leak detection device according to the present invention; Figure 3 This is a schematic diagram of the flexible silicone membrane structure of a gas leak detection device for petrochemical production according to this utility model; Figure 4 This is a schematic diagram of the gas pipeline structure of a gas leak detection device for petrochemical production according to this utility model.

[0013] In the diagram: 1-Gas pipe, 2-Sealing rubber ring, 3-Arc-shaped connecting plate, 4-Connecting upper cover, 5-Connecting lower cover, 6-Alarm module, 7-Sensor module, 8-Control panel, 9-Infrared sensor, 10-PID sensor, 11-Catalytic combustion sensor, 12-Through groove, 13-Rubber insulating inner frame, 14-Flexible silicone film, 15-Copper sheet, 16-First insulating block, 17-First parallel conductive sheet, 18-Second insulating block, 19-Second parallel conductive sheet, 20-Alarm. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] Please see Figures 1-4This utility model provides a technical solution: a gas leak detection device for petrochemical production, including a gas pipeline 1, a connecting upper cover 4, and a connecting lower cover 5. Two gas pipelines 1 are provided, connected and fixed together by flanges and multiple bolts. Sealing rubber rings 2 are fitted on the left and right ends of both gas pipelines 1, and arc-shaped connecting plates 3 are fitted on the upper and lower ends of both sealing rubber rings 2. The connecting upper cover 4 and the connecting lower cover 5 are fixed to the outside of the two gas pipelines 1 by multiple bolts and sealing rubber sheets. An alarm module 6 and a sensor module 7 are respectively connected to the left and right sides of the lower end of the connecting lower cover 5. The sensor module 7 embeds an infrared sensor 9, a PID sensor 10, and a catalyst. The combustion sensor 11 and sensor module 7 are equipped with a control panel 8 and an alarm 20 at the front end. The alarm module 6 has a rubber insulating inner frame 13 fixed to its inner edge. A flexible silicone membrane 14 is set inside the rubber insulating inner frame 13. A copper sheet 15 is set at the lower end of the flexible silicone membrane 14. A first insulating block 16 and a second insulating block 18 are respectively installed on the left and right ends inside the alarm module 6. A first parallel conductive sheet 17 and a second parallel conductive sheet 19 are respectively embedded in the inner end face of the first insulating block 16 and the first insulating block 18. This design solves the problem that the alarm and switch components in the original gas leak detection device for petrochemical safety production are set above the pipeline, resulting in insufficient speed and sensitivity of the detection.

[0016] As the first embodiment of this utility model: multiple arc-shaped connecting plates 3 are fixed to the left and right sides of the connecting upper cover 4 and the left and right sides of the connecting lower cover 5, respectively. The connecting upper cover 4 and the connecting lower cover 5 are fixed to the outside of the above structure by bolts and sealing plates, forming a sealed detection cavity (i.e., a cavity formed by two flange faces, sealing rubber rings 2, connecting upper cover 4 and connecting lower cover 5). A through groove 12 is provided between the alarm module 6 and the sensor module 7, and the sides of the alarm module 6 and the sensor module 7 are connected through the added through groove 12. The surface of the flexible silicone membrane 14 is coated with an antistatic coating. The added antistatic coating ensures that the flexible silicone membrane 14 directly prevents electrostatic interference, making the detection more accurate. The flexible silicone membrane 14 has a thickness between 0.1 and 0.3 mm and is embedded with an extremely thin aramid fiber mesh to increase fatigue strength and tear resistance. This reinforced membrane can withstand higher pressure impacts and more frequent deformation cycles, resulting in a longer service life. The copper sheet 15 is normally suspended above the gap between the first parallel conductive sheet 17 and the second parallel conductive sheet 19. The copper sheet 15 is normally suspended above the gap between the first parallel conductive sheet 17 and the second parallel conductive sheet 19, and is in a de-energized state.

[0017] The first parallel conductive sheet 17 and the second parallel conductive sheet 19 are connected to the control panel 8 and the alarm 20 through wires. One end of the control panel 8 is connected to an external power supply, an infrared sensor 9, a PID sensor 10 and a catalytic combustion sensor 11 through a data line. The added catalytic combustion sensor 11 can measure the concentration of combustible gas, the infrared sensor 9 can identify specific gases, and the PID sensor 10 can detect ppb-level concentrations.

[0018] As a second embodiment of this utility model: In actual use, the device is wrapped and fixed to the pipe flange connection to ensure its sealing. The control panel 8 is connected to an external power source. Under normal circumstances, there is no abnormal pressure in the detection chamber, the flexible silicone membrane 14 is not deformed, and the copper sheet 15 at its lower end does not contact the first parallel conductive sheet 17 and the second parallel conductive sheet 19 below it; the alarm circuit is in an open circuit state. When a leak occurs at the flange connection, petrochemical gases with a density greater than air (such as propane and butane) will sink and quickly accumulate in the lowest position of the detection chamber. The accumulated gas causes the pressure inside the chamber to increase. The pressure acts on the flexible silicone membrane 14, causing it to undergo elastic deformation downwards. The deformed membrane drives the copper sheet 15 at its lower end to move downwards until it simultaneously contacts the first parallel conductive sheet 17 and the second parallel conductive sheet 19. The copper sheet 15 bridges the first parallel conductive sheet 17 and the second parallel conductive sheet 19, instantly forming a complete electrical path. Current flows through this path, directly driving the alarm 20 to emit an audible and visual alarm. This process is purely mechanically triggered, with an extremely short response time (≤2 seconds), completely independent of any electronic sensor processing or judgment. Almost simultaneously with the mechanical alarm, the leaked gas enters the sensor module 7 through the channel 12. The infrared sensor 9, PID sensor 10, and catalytic combustion sensor 11 within the module begin to operate, analyzing the gas composition and concentration, and transmitting the signal to the control panel 8. The control panel 8 can perform secondary confirmation of the alarm signal and may execute more complex logic control (such as linking and closing externally installed valves, activating the ventilation system, etc.).

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0020] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas leak detection device for petrochemical production, comprising a gas pipeline (1), a connecting upper cover (4), and a connecting lower cover (5), characterized in that: Two gas pipes (1) are provided, and the two gas pipes (1) are connected and fixed by flanges and multiple bolts. Sealing rubber rings (2) are fitted on the left and right ends of both gas pipes (1). Arc-shaped connecting plates (3) are fitted on the upper and lower ends of both sealing rubber rings (2). The upper connecting cover (4) and the lower connecting cover (5) are fixed to the outside of the two gas pipes (1) by multiple bolts and sealing rubber sheets. An alarm module (6) and a sensor module (7) are respectively connected to the left and right sides of the lower end of the lower connecting cover (5). The sensor module (7) embeds an infrared sensor (9), a PID sensor (10), and... The catalytic combustion sensor (11) has a control panel (8) and an alarm (20) installed at the front end of the sensor module (7). The alarm module (6) has a rubber insulating inner frame (13) fixed inside the edge. A flexible silicone film (14) is provided inside the rubber insulating inner frame (13). A copper sheet (15) is provided at the lower end of the flexible silicone film (14). A first insulating block (16) and a second insulating block (18) are respectively installed on the left and right ends inside the alarm module (6). A first parallel conductive sheet (17) and a second parallel conductive sheet (19) are respectively embedded in the inner end face of the first insulating block (16) and the first insulating block (16).

2. The petrochemical production gas leak detection device according to claim 1, characterized in that: Multiple arc-shaped connecting plates (3) are respectively fixed to the left and right sides of the connecting upper cover (4) and the left and right sides of the connecting lower cover (5).

3. The petrochemical production gas leak detection device according to claim 1, characterized in that: A through slot (12) is provided between the alarm module (6) and the sensor module (7).

4. The petrochemical production gas leak detection device according to claim 1, characterized in that: The surface of the flexible silicone film (14) is coated with an antistatic coating.

5. The petrochemical production gas leak detection device according to claim 1, characterized in that: The copper sheet (15) is normally suspended above the gap between the first parallel conductive sheet (17) and the second parallel conductive sheet (19).

6. The petrochemical production gas leak detection device according to claim 1, characterized in that: The first parallel conductive sheet (17) and the second parallel conductive sheet (19) are connected to the control panel (8) and the alarm (20) through wires. One end of the control panel (8) is connected to the external power supply, infrared sensor (9), PID sensor (10) and catalytic combustion sensor (11) through a data line.

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