CN111812182A - Explosive gas detection device for purging intake air of explosion-proof motor - Google Patents

Abstract

An explosive gas detection device for blowing and air intake of an explosion-proof motor relates to an explosive gas detection device. The invention solves the problems that the type of the blowing gas of the existing explosion-proof motor can not be judged, and serious safety accidents can be caused if the explosive gas is blown into the inner cavity of the motor by accident. The purging device is arranged in the base, the purging pipeline is connected with the purging device and provides purging gas for the purging pipeline, the explosive gas detection device is arranged on the purging pipeline and comprises a gas inlet valve, a gas outlet valve, a gas pipe cavity, an alarm, a junction box and an installation pipe, the installation pipe is arranged on the purging pipeline in series, the gas pipe cavity is arranged at the lower end of the installation pipe and communicated with the gas pipe cavity, the gas outlet valve is arranged on the gas pipe cavity, the gas inlet valve is arranged at one end of the installation pipe, the alarm is arranged at the upper end of the installation pipe, and the junction box is connected with the alarm. The invention is used for detecting the explosive gas of the blowing air inlet of the explosion-proof motor.

Description

Explosive gas detection device for purging intake air of explosion-proof motor

technical field

The invention relates to an explosion-proof motor purging and intake explosive gas detection device.

Background technique

Explosion-proof motors with positive pressure housing type explosion-proof technology, in order to ensure the effective replacement of the gas in the motor cavity, the motor cavity needs to be purged with gas. The purge gas used is generally fresh and dry air or nitrogen. However, there are many types of gas sources in large chemical plants, and most of the gases are colorless and odorless. It is impossible to judge whether the purge gas is an explosive gas by human senses. If the explosive gas is accidentally blown into the motor cavity, it will cause serious safety accidents. .

To sum up, the type of purging gas for the existing explosion-proof motor cannot be judged. If the explosive gas is accidentally blown into the inner cavity of the motor, it will cause serious safety accidents.

SUMMARY OF THE INVENTION

In order to solve the problem that the type of the purging gas of the existing explosion-proof motor cannot be judged, the invention will cause serious safety accidents if the explosive gas is accidentally blown into the inner cavity of the motor. Provided is an explosion-proof motor purging intake explosive gas detection device.

The technical scheme of the present invention is an explosion-proof motor purging and intake explosive gas detection device, which comprises a machine base 1, a purging device 2 and a purging pipeline 3, wherein the purging device 2 is installed on the machine base 1, and the purging pipeline 3 It is connected with the purging device 2 and provides purging gas for the purging device 2. It also includes an explosive gas detection device 4. The explosive gas detection device 4 is installed on the purging pipeline 3. The explosive gas detection device 4 includes an air inlet valve 4 -1. Air outlet valve 4-2, gas lumen 4-3, alarm 4-4, main body of detection device 4-5, junction box 4-6 and installation pipe 4-7, installation pipe 4-7 is installed in series in On the purging pipe 3, the gas lumen 4-3 is installed on the lower end of the installation pipe 4-7 and communicated with the gas lumen 4-3, the air outlet valve 4-2 is installed on the gas lumen 4-3, and the air inlet The valve 4-1 is installed on one end of the installation pipe 4-7, the detection device main body 4-5 is installed on the installation pipe 4-7, the alarm 4-4 is installed on the detection device main body 4-5, and the junction box 4-6 is installed On the side of the detection device body 4-5.

Compared with the prior art, the present invention has the following improvement effects:

In the present invention, an explosive gas detection device is installed on the purging pipeline, so that when the gas is blown into the explosion-proof motor, the blown gas can be detected first to detect whether it contains flammable and explosive gas, and if there is dangerous gas, Then close the valve and do not pass into the purging device. If there is no dangerous gas, blow it into the purging device. It solves the danger that the explosion-proof motor accidentally enters the explosive gas and avoids serious safety accidents.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention. FIG. 2 is a partial enlarged view of the explosive gas detection device. FIG. 3 is a control logic diagram of the explosive gas detection device.

Detailed ways

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The present embodiment will be described with reference to FIG. 1 and FIG. 2. An explosion-proof motor purging and intake explosive gas detection device includes a base 1, a purging device 2 and a purging pipeline 3. The purging device 2 is installed on the base. In 1, the purging pipeline 3 is connected with the purging device 2 and provides purging gas for the purging pipeline 3. It also includes an explosive gas detection device 4, and the explosive gas detection device 4 is installed on the purging pipeline 3. The explosive gas detection device 4 Including the inlet valve 4-1, the outlet valve 4-2, the gas lumen 4-3, the alarm 4-4, the main body of the detection device 4-5, the junction box 4-6 and the installation pipe 4-7, installation The pipe 4-7 is installed in series on the purging pipe 3, the gas lumen 4-3 is installed on the lower end of the installation pipe 4-7 and communicates with the gas lumen 4-3, and the gas outlet valve 4-2 is installed in the gas lumen 4 -3, the air inlet valve 4-1 is installed on one end of the installation pipe 4-7, the detection device main body 4-5 is installed on the installation pipe 4-7, and the alarm 4-4 is installed on the detection device main body 4-5 , the junction box 4-6 is installed on one side of the main body 4-5 of the detection device.

In order to solve the accident that the explosion-proof motor is purged and accidentally introduced into the explosive gas, the present invention provides a detection device for identifying the gas type.

The explosion-proof motor purging air inlet of the present invention is equipped with an explosive gas detection device with a valve, and a high-precision gas sensor is installed in the tube cavity at the lower part of the detection device. For a specific type of gas, through electrochemical reaction, the chemical quantity of the gas is converted into an analog output of an electrical signal, and an audible and visual alarm is issued and an alarm signal is transmitted to the control room. The gas detection device comes with two valves, one controls the purge air inlet and the other controls the detection air outlet. At the beginning of purging, the purging inlet valve is closed, and the detection outlet valve is opened, so that the gas can pass through the lumen where the gas sensor is installed. Send a signal to the control room; if no explosive gas is detected, after a given time, the purge inlet valve will be automatically opened, and the detection outlet valve will be closed to start normal purging. The detection device only needs 24VDC or 220VAC power supply, can output 4-20mA (optional HART) signal, and can alarm with sound and light. It solves the danger that the explosion-proof motor accidentally enters the explosive gas and avoids serious safety accidents.

1 to 3 illustrate the working principle of the present invention:

In FIG. 1 , the explosive gas detection device 4 is first installed in the purge line 3 . Then connect the explosive gas detection device 4 to the power supply. Again, lead the output end of the explosive gas detection device 4 to the control room.

In Figures 2 and 3, the inlet valve 4-1 is first closed. Then open the outlet valve 4-2. Third, the purging gas is blown in from the installation pipe 4-7 and flows out through the gas lumen 4-3. Fourth, this state works for 10s (this time can be adjusted), if an explosive gas is detected, the relay will act, the alarm 4-4 will send out sound and light alarm, and the signal will be transmitted to the control room through the junction box 4-6; Action, the inlet valve 4-1 is opened, the outlet valve 4-2 is closed, and the normal purging stage is entered.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. The utility model provides an explosion-proof machine sweeps and admits air explosive gas detection device, it includes frame (1), sweeps device (2) and sweeps pipeline (3), sweeps device (2) and installs on frame (1), sweeps pipeline (3) and sweep device (2) and be connected and sweep gas, its characterized in that for sweeping device (2) provide: the explosive gas detection device (4) comprises a gas inlet valve (4-1), a gas outlet valve (4-2), a gas tube cavity (4-3), an alarm (4-4), a detection device main body (4-5), a junction box (4-6) and a mounting tube (4-7), wherein the mounting tube (4-7) is installed on the purging pipeline (3) in series, the gas tube cavity (4-3) is installed at the lower end of the mounting tube (4-7) and communicated with the gas tube cavity (4-3), the gas outlet valve (4-2) is installed on the gas tube cavity (4-3), the gas inlet valve (4-1) is installed at one end of the mounting tube (4-7), the detection device main body (4-5) is installed on the mounting tube (4-7), the alarm (4-4) is arranged on the detection device main body (4-5), and the junction box (4-6) is arranged on one side of the detection device main body (4-5).

2. The explosion-proof motor purging air-intake explosive gas detection device according to claim 1, characterized in that: the explosive gas detection device (4) further comprises a gas sensor which is arranged in the gas tube cavity (4-3).

3. The explosion-proof motor purging air-intake explosive gas detection device according to claim 1, characterized in that: an explosive gas detection device (4) is mounted on the purge line (3) near the gas inlet side.

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