Automatic locking device for detecting gas concentration exceeding standard

Abstract

The utility model discloses an automatic locking device for detecting standard exceeding of gas concentration, which comprises a case, a gas pumping mechanism is arranged on the outer side of the case, a filtering mechanism is mounted in the case, a hydrogen sulfide detector is arranged above the filtering mechanism, a connecting line is mounted on one side of the hydrogen sulfide detector, and a gas outlet is formed in the other side of the hydrogen sulfide detector. A PLC is installed at one end of the connecting line, an external control assembly is connected to the outer side of the PLC, and a rotor flow meter is connected to the other side of the filtering mechanism through a pipeline. By arranging the gas extraction mechanism, the filtering mechanism, the hydrogen sulfide detector and the external control assembly, the gas extraction pump can be installed at the 1 / 3 position of the lower portion of the access door, pumped gas enters the filtering mechanism through the gas conveying pipe to be filtered many times, the filtered gas enters the hydrogen sulfide detector, and the concentration of the hydrogen sulfide gas is detected; after the concentration exceeds the standard, an analog quantity signal is sent out and is translated to control a closing signal of the magnetic lock, so that access door locking is realized, and potential safety hazards are prevented.

Description

Technical Field

[0001] This utility model relates to the field of gas concentration detection technology, and in particular to an automatic locking device when the gas concentration exceeds the standard. Background Technology

[0002] Associated gases produced during crude oil extraction are rich in hydrogen sulfide, with detected levels ranging from a high of 3400 ppm to a low of 1700 ppm. Hydrogen sulfide is a colorless, highly toxic, and acidic gas. It will explode when mixed with air or oxygen in appropriate proportions (4.3%–46%). The main hazards of hydrogen sulfide to humans include: brain damage, irritation of the central nervous system and respiratory mucosa, myocardial damage, chronic poisoning, and death from high concentrations within minutes.

[0003] At existing hot furnace work stations, the fixed combustible gas detectors in the heating furnace room are located far from the entrance and exit, and their detection accuracy is affected, resulting in no reports. The axial flow fans cannot achieve ventilation in the concealed parts and cannot ventilate the entrance and exit within the specified time. This leads to the risk of health hazards such as dizziness, nausea, and vertigo caused by smelling harmful gases when the inspection personnel open the entrance and exit, as well as the high risk of fire and explosion caused by the accumulation of combustible gases encountering a source of ignition. Utility Model Content

[0004] The main purpose of this invention is to provide an automatic locking device when the gas concentration exceeds the standard.

[0005] The objective of this utility model can be achieved by adopting the following technical solution:

[0006] An automatic interlocking device for detecting excessive gas concentration includes a chassis, an external suction mechanism, a filter mechanism installed inside the chassis, a hydrogen sulfide detector above the filter mechanism, a connecting cable installed on one side of the hydrogen sulfide detector, a PLC controller installed at one end of the connecting cable, an external control component connected to the outside of the PLC controller, and a rotor flow meter connected to the other side of the filter mechanism via a pipe.

[0007] Preferably, the air extraction mechanism includes an air supply pipe that penetrates the side wall of the chassis, and an air pump is installed at one end of the air supply pipe.

[0008] Preferably, the filtration mechanism includes a first filter and a second filter, and the other end of the gas supply pipe is connected to the first filter.

[0009] Preferably, the housings of both the first filter and the second filter are made of plexiglass.

[0010] Preferably, the hydrogen sulfide detector is connected to the second filter, and the hydrogen sulfide detector is equipped with a sensor for detecting the concentration of hydrogen sulfide.

[0011] Preferably, the external control component includes an external wiring connection to the PLC controller, and an electromagnetic lock is installed at one end of the external wiring connection.

[0012] Preferably, a peristaltic pump is connected to one side of the second filter via a pipe.

[0013] The beneficial effects of this technology are:

[0014] By setting up an air extraction mechanism, a filtration mechanism, a hydrogen sulfide detector, and an external control component, the air extraction pump can be installed at the lower 1 / 3 of the door / exit. The extracted gas enters the filtration mechanism through the gas delivery pipe for multiple filtrations. After filtration, it enters the hydrogen sulfide detector to detect the concentration of hydrogen sulfide gas. If the concentration exceeds the standard, an analog signal is sent, which is translated and controls the closing signal of the magnetic lock, thereby achieving door / exit interlocking and preventing safety hazards. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of an automatic locking device for detecting excessive gas concentration according to the present invention;

[0016] Figure 2 This is a cross-sectional view of a hydrogen sulfide detector in a preferred embodiment of an automatic interlocking device for detecting excessive gas concentration according to the present invention.

[0017] The annotations in the attached figures are explained as follows:

[0018] 1. Chassis; 2. Air extraction mechanism; 201. Air pump; 202. Gas delivery pipe; 3. Filtration mechanism; 301. First filter; 302. Second filter; 4. Hydrogen sulfide detector; 5. Rotor flow meter; 6. Connecting cable; 7. PLC controller; 8. External control components; 801. External wiring; 802. Electromagnetic lock; 9. Peristaltic pump. Detailed Implementation

[0019] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0020] like Figures 1-2As shown in the figure, this embodiment provides an automatic interlocking device when the gas concentration exceeds the standard. It includes a housing 1, an exhaust mechanism 2 on the outside of the housing 1, a filter mechanism 3 installed inside the housing 1, a hydrogen sulfide detector 4 above the filter mechanism 3, a connecting line 6 installed on one side of the hydrogen sulfide detector 4, the connecting line 6 is used to transmit the detection signal of the hydrogen sulfide detector 4 to the PLC controller 7, the PLC controller 7 is installed at one end of the connecting line 6, the PLC controller 7 can control the switch of the electromagnetic lock 802, an external control component 8 is connected to the outside of the PLC controller 7, and a rotor flow meter 5 is connected to the other side of the filter mechanism 3 through a pipe, the rotor flow meter 5 can control the flow rate of the extracted gas to prevent the gas flow from being too fast and damaging the hydrogen sulfide detector 4.

[0021] like Figure 1 As shown, the air extraction mechanism 2 includes an air supply pipe 202 that penetrates the side wall of the casing 1. An air pump 201 is installed at one end of the air supply pipe 202. The gas extracted by the air pump 201 is delivered to the filter mechanism 3 through the air supply pipe 202.

[0022] like Figure 1 As shown, the filtration mechanism 3 includes a first filter 301 and a second filter 302. The other end of the gas supply pipe 202 is connected to the first filter 301. The first filter 301 and the second filter 302 can respectively remove dust, impurities and moisture from the extracted gas, so as to avoid impurities in the gas components from affecting the false alarm of the hydrogen sulfide detector 4.

[0023] like Figure 1 As shown, the outer shells of the first filter 301 and the second filter 302 are both made of plexiglass, which makes it easy for staff to see the color of the filter cartridges inside the first filter 301 and the second filter 302, so as to replace them in a timely manner.

[0024] like Figures 1-2 As shown, the hydrogen sulfide detector 4 is connected to the second filter 302, and a sensor for detecting the concentration of hydrogen sulfide is installed inside the hydrogen sulfide detector 4. Hydrogen sulfide gas and air can release charges and form current in the corresponding oxidation-reduction reaction between the working electrode and the counter electrode. The magnitude of the current is proportional to the concentration of hydrogen sulfide gas. The concentration of hydrogen sulfide gas can be determined by testing the magnitude of the current.

[0025] like Figure 1 As shown, the external control component 8 includes an external wiring 801 connected to the PLC controller 7. An electromagnetic lock 802 is installed at one end of the external wiring 801, which facilitates the transmission of electrical control signals through the external wiring 801 to open and close the electromagnetic lock 802.

[0026] like Figure 1 As shown, a peristaltic pump 9 is connected to one side of the second filter 302 via a pipe, which facilitates the extraction of impurities from the second filter 302 by the peristaltic pump 9.

[0027] The working principle of this device is as follows: During use, the operator installs the extraction pump 201 at the lower 1 / 3 of the inlet / outlet. The gas pumped by the pump 201 enters the filter mechanism 3 through the gas delivery pipe 202. The first filter 301 and the second filter 302 respectively remove dust, impurities, and moisture from the extracted gas, preventing impurities from affecting the false alarm of the hydrogen sulfide detector 4. The filtered gas then enters the hydrogen sulfide detector 4. Hydrogen sulfide gas and air undergo a redox reaction at the working electrode and the counter electrode, releasing charge and forming an electric current. The magnitude of the current is proportional to the concentration of hydrogen sulfide gas. By testing the current magnitude, the concentration of hydrogen sulfide gas can be determined. During the detection process, the rotor flowmeter 5 controls the flow rate of the extracted gas to prevent excessively fast airflow from damaging the hydrogen sulfide detector 4. When the concentration exceeds the limit, an analog signal is emitted, which, after translation, controls the closing signal of the magnetic lock, thereby locking the inlet / outlet and preventing safety hazards.

[0028] The above are merely further embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed by this utility model, based on the technical solution and concept of this utility model, shall fall within the protection scope of this utility model.

Claims

1. An automatic interlocking device for detecting excessive gas concentration, characterized in that: The device includes a chassis (1), an air extraction mechanism (2) is provided on the outside of the chassis (1), a filter mechanism (3) is installed inside the chassis (1), a hydrogen sulfide detector (4) is provided above the filter mechanism (3), a connecting line (6) is installed on one side of the hydrogen sulfide detector (4), a PLC controller (7) is installed at one end of the connecting line (6), an external control component (8) is connected to the outside of the PLC controller (7), and a rotor flow meter (5) is connected to the other side of the filter mechanism (3) through a pipe.

2. The automatic interlocking device for detecting excessive gas concentration according to claim 1, characterized in that: The air extraction mechanism (2) includes an air supply pipe (202) that passes through the side wall of the chassis (1), and an air pump (201) is installed at one end of the air supply pipe (202).

3. The automatic interlocking device for detecting excessive gas concentration according to claim 2, characterized in that: The filtration mechanism (3) includes a first filter (301) and a second filter (302), and the other end of the gas supply pipe (202) is connected to the first filter (301).

4. The automatic interlocking device for detecting excessive gas concentration according to claim 3, characterized in that: The housings of both the first filter (301) and the second filter (302) are made of plexiglass.

5. The automatic interlocking device for detecting excessive gas concentration according to claim 4, characterized in that: The hydrogen sulfide detector (4) is connected to the second filter (302), and a sensor for detecting hydrogen sulfide concentration is installed inside the hydrogen sulfide detector (4).

6. The automatic interlocking device for detecting excessive gas concentration according to claim 1, characterized in that: The external control component (8) includes an external wiring (801) connected to the PLC controller (7), and an electromagnetic lock (802) is installed at one end of the external wiring (801).

7. The automatic interlocking device for detecting excessive gas concentration according to claim 3, characterized in that: A peristaltic pump (9) is connected to one side of the second filter (302) via a pipe.

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