A toxic and harmful gas detection alarm control system
By introducing a toxic gas detection and alarm control system into industrial environments such as metallurgy, chemical industry, and gas stations, the problems of poor reliability and slow response of manual inspections have been solved. This system enables multi-level early warning, automated linkage, and equipment protection, thereby improving the real-time performance and accuracy of safety monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-26
AI Technical Summary
Existing technologies in industrial environments such as metallurgy, chemical industry, and gas stations suffer from problems such as high subjectivity of manual inspections, delayed response, numerous monitoring blind spots, high false alarm rate of single threshold alarms, and lack of automated linkage, which lead to delayed emergency response and spread of accidents.
The system employs a toxic gas detection and alarm control system, which includes a field alarm, a toxic gas detector, a gas alarm controller, a 2P air switch, a 3P air switch, an AC contactor, a thermal overload relay, and an exhaust fan. Through multi-level early warning thresholds and automated linkage, it achieves real-time monitoring and rapid response to toxic gases.
It implements a multi-level early warning mechanism to avoid false alarms and missed alarms, and automated linkage control to quickly contain accidents, thereby improving the reliability and coverage of the system, eliminating monitoring blind spots, and providing equipment overload protection.
Smart Images
Figure CN224417368U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of instrument automatic control technology, specifically to a toxic gas detection alarm control system, which is particularly suitable for gas leak monitoring and safety linkage control in toxic, fire-proof, and explosion-proof places such as metallurgical plants, chemical plants, and gas stations. Background Technology
[0002] In industrial environments involving toxic, flammable, and explosive gases, such as metallurgy, chemical plants, and gas stations, existing safety monitoring technologies have significant shortcomings: reliance on manual inspections leads to high subjectivity, delayed response times, and numerous blind spots. For example, an explosion occurred at a metallurgical company because a minor leak in a gas pipeline was missed during a manual inspection. Portable detectors can only perform passive detection after the fact, lacking automated linkage with ventilation systems, resulting in delayed emergency response. For instance, a hydrogen sulfide leak at a chemical plant caused personnel poisoning due to the failure to trigger timely ventilation. Existing fixed monitoring systems mostly use single-threshold alarms, resulting in high false alarm rates and lacking tiered early warning mechanisms. They also lack equipment overload protection and fault feedback functions, making it difficult to contain the spread of accidents. These problems highlight the inadequacies of existing technologies in real-time monitoring, rapid response, and automated linkage. There is an urgent need for an intelligent system integrating continuous monitoring, multi-level early warning, strong ventilation linkage, and equipment protection functions to improve industrial safety protection capabilities from the source. Utility Model Content
[0003] The purpose of this invention is to provide a toxic gas detection and alarm control system that solves the problems of poor reliability and slow response of manual inspection through real-time monitoring, multi-level early warning and automated linkage.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A toxic gas detection and alarm control system includes at least one field alarm.
[0006] At least one toxic gas detector, which is connected to the on-site alarm, is used to detect the concentration of toxic gas in the environment and output a corresponding electrical signal.
[0007] A gas alarm controller, connected to the toxic gas detector, is used to receive the electrical signal and determine whether to trigger an alarm based on a preset threshold.
[0008] At least one 2P air switch, the input of which is connected to the relay output of the gas alarm controller;
[0009] At least one AC contactor, with its coil A1 terminal connected to the output terminal of the 2P air switch and its coil A2 terminal connected to the normally closed input terminal of the thermal overload relay.
[0010] At least one 3P air switch, the three-phase power output terminal of which is connected to the main contacts of the AC contactor;
[0011] At least one exhaust fan, the power input terminal of which is connected to the main contacts of the AC contactor through the main contacts of the thermal overload relay;
[0012] The normally closed output terminal of the thermal overload relay is connected to the passive relay terminal of the gas alarm controller to form a fan overload protection circuit.
[0013] Furthermore, the on-site alarm and toxic gas detector are connected to form a free end, which is installed in areas where toxic gas is prone to leakage or accumulation.
[0014] Furthermore, the gas alarm controller, 2P air switch, 3P air switch, AC contactor, and thermal overload relay are connected to form a fixed terminal.
[0015] Furthermore, a fan linkage control box is provided outside the fixed end. The fan linkage control box is provided with an upper cable entry point and a lower cable entry point. The upper cable entry point is used for the wiring between the gas alarm controller and the 2P air switch, and the lower cable entry point is used for the wiring between the thermal overload relay and the exhaust fan. The fan linkage control box is installed outside the 2P air switch, the 3P air switch, the AC contactor, and the thermal overload relay.
[0016] Furthermore, the number of free ends matches the number of fixed ends.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1. Multi-level early warning mechanism for precise risk control: By setting two levels of early warning thresholds, the system can distinguish between minor leaks and dangerous leaks, avoiding false alarms or missed alarms caused by a single threshold.
[0019] 2. Automated linkage control for rapid accident containment: The gas alarm controller directly drives the relay to control the exhaust fan, with a response time of less than 2 seconds, requiring no manual intervention.
[0020] 3. Multi-point centralized monitoring and overload protection to improve system reliability: Supports centralized management of multiple detectors and fan linkage control box, covering complex process areas and eliminating monitoring blind spots; thermal overload relay automatically cuts off the circuit and feeds back fault signal when the fan is abnormal, preventing equipment damage from causing secondary accidents. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the present invention;
[0022] In the diagram, 1-On-site alarm, 2-Toxic gas detector, 3-Gas alarm controller, 4-2P air switch, 401-L outlet terminal, 402-N outlet terminal, 5-3P air switch, 6-AC contactor, 601-A1 terminal, 602-A2 terminal, 7-Thermal overload relay, 701-Normally closed contact, 8-Exhaust fan, 9-Upper cable inlet, 10-Lower cable inlet, 11-Fan linkage control box. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0024] like Figure 1 As shown, a toxic gas detection and alarm control system includes a field alarm 1, a toxic gas detector 2, a gas alarm controller 3, a 2P air switch 4, a 3P air switch 5, an AC contactor 6, a thermal overload relay 7, and an exhaust fan 8. The on-site alarm 1 is connected to the toxic gas detector 2; the toxic gas detector 2 is connected to the gas alarm controller 35; one end of the gas alarm controller 3 is connected to the L outlet 401 of the 2P air switch 4 via the upper cable inlet 9 of the fan linkage control box 11; the N outlet 402 of the 2P air switch 4 is connected to the coil A1 end 601 of the AC contactor 6; the coil A2 end 602 of the AC contactor 6 is connected to the normally closed contact 701 inlet of the thermal overload relay 7; the normally closed contact 701 outlet of the thermal overload relay 7 is connected to the other ends of the relays 1 and 2 of the gas alarm controller 35; the three-phase power supply of the 3P air switch 5 is connected to the contacts of the AC contactors 61, 3, and 5; the contacts of the AC contactors 62, 4, and 6 are connected to the contacts of the thermal overload relays 71, 3, and 5; and the contacts of the thermal overload relays 72, 4, and 6 are connected to the three-phase exhaust fan 8.
[0025] The toxic and harmful gas detector uses the HRP-T1000 point-type gas detector from Zhengzhou Huiruipu Electronic Technology Co., Ltd., which converts the concentration of toxic gases in the air into a digital signal. It can output a standard 4-20mA current signal, or a two-wire or four-wire RS485 MODBUS-RTU signal. It is compatible with secondary instruments, PLC, DCS systems, and data acquisition modules, and features long transmission distance and good anti-interference performance.
[0026] The toxic and harmful gas alarm controller 3 uses the 3000 bus-type gas alarm controller 3 from Zhengzhou Huiruipu Electronic Technology Co., Ltd., to detect the content of harmful gases in the air. It supports four bus detectors and provides centralized control for multiple points. The system uses a microprocessor as the control unit. When the concentration of toxic gases in the environment reaches or exceeds the preset value, the controller immediately issues an audible and visual alarm and drives the exhaust fan 8 by energizing the control circuit of the AC contactor 6 via the built-in relay.
[0027] AC contactor 6 uses CJX2 from Delixi Group. S 0911, voltage 220V AC, 50HZ.
[0028] The thermal overload relay 7 uses the Delixi Group JR36-32 three-phase thermal overload relay 7, which is suitable for currents of 20~32A. Its protection functions include motor overload and phase loss protection. It has a temperature compensation structure and can be manually or automatically reset.
[0029] The on-site alarm 1 and toxic gas detector 2 are connected to form a free end, which is installed in areas where toxic gas is prone to leakage or accumulation. The gas alarm controller 3, 2P air switch 4, 3P air switch 5, AC contactor 6, and thermal overload relay 7 are connected to form a fixed end. The number of free ends and fixed ends are matched; in this embodiment, two free ends are matched with two fixed ends. The free ends are installed in areas such as gas pipeline interfaces, tops of storage tanks, and corners of workshops, focusing on monitoring areas where toxic gas is prone to leakage or accumulation. The fixed ends can be installed in easily accessible locations such as the main control room.
[0030] The working process of this utility model is as follows:
[0031] The toxic gas detector 2 continuously monitors measurable toxic gases in industrial environments and converts the concentration of toxic gases into digital signals. These signals are transmitted to the toxic gas alarm controller 3, which identifies, displays, and processes the signals. When the concentration of toxic gases in the environment reaches or exceeds a threshold, the toxic gas alarm controller 3 immediately issues an audible and visual alarm and, through a relay, energizes the control circuit of the AC contactor 6 to drive the exhaust fan 8, achieving forced ventilation in case of emergencies, preventing explosions and fires, and thus ensuring the safety of life and property.
Claims
1. A toxic and harmful gas detection and alarm control system, characterized in that, Includes at least one on-site alarm (1); At least one toxic gas detector (2) is connected to the on-site alarm (1) and is used to detect the concentration of toxic gas in the environment and output the corresponding electrical signal. The gas alarm controller (3) is connected to the toxic gas detector (2) and is used to receive the electrical signal and determine whether to trigger an alarm based on a preset threshold. At least one 2P air switch (4) has its input terminal connected to the relay output terminal of the gas alarm controller (3); At least one AC contactor (6) has its coil A1 terminal (601) connected to the output terminal of the 2P air switch (4) and its coil A2 terminal (602) connected to the normally closed contact (701) input terminal of the thermal overload relay (7); At least one 3P air switch (5) has its three-phase power output terminal connected to the main contacts of the AC contactor (6); At least one exhaust fan (8) has its power input terminal connected to the main contact of the AC contactor (6) through the main contact of the thermal overload relay (7); The normally closed contact (701) output terminal of the thermal overload relay (7) is connected to the passive relay terminal of the gas alarm controller (3) to form a fan overload protection circuit.
2. The toxic and harmful gas detection and alarm control system according to claim 1, characterized in that, The on-site alarm (1) and the toxic gas detector (2) are connected to form a free end, which is installed in areas where toxic gas is prone to leakage and accumulation.
3. The toxic and harmful gas detection and alarm control system according to claim 2, characterized in that, The gas alarm controller (3), 2P air switch (4), 3P air switch (5), AC contactor (6), and thermal overload relay (7) are connected to form a fixed terminal.
4. The toxic and harmful gas detection and alarm control system according to claim 3, characterized in that, The fixed end is provided with a fan linkage control box (11). The fan linkage control box (11) is provided with an upper cable entry (9) and a lower cable entry (10). The upper cable entry (9) is used to run the line between the gas alarm controller (3) and the 2P air switch (4). The lower cable entry (10) is used to run the line between the thermal overload relay (7) and the exhaust fan (8). The fan linkage control box (11) is installed outside the 2P air switch (4), the 3P air switch (5), the AC contactor (6), and the thermal overload relay (7).
5. The toxic and harmful gas detection and alarm control system according to claim 4, characterized in that, The number of free ends matches the number of fixed ends.