JP2001116646A - Moisture penetration countermeasure system for explosionproof structure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture penetration countermeasure system for an explosionproof structure container capable of suppressing accumulation of water on the inside of the explosionproof structure container of an electric apparatus and reducing generation of malfunction of the electric apparatus. SOLUTION: This system is equipped with a liquid detection means 12 for detecting liquid penetrated in the explosionproof structure container of the electric apparatus 10; and an alarm means 13 for informing penetration of liquid into a container 11 to the outside of the container 11 based on the detected result with the liquid detection means 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for preventing intrusion of water into an explosion-proof structure container of an electric device.

[0002]

2. Description of the Related Art For example, a container of an electric device installed in an explosion-proof area of a liquefied gas plant (an area where flammable gas may leak into the atmosphere) is generally of an explosion-proof structure. The explosion-proof structure is specified for each type according to the type of gas and the environment.For example, the pressure-resistant explosion-proof structure is a fully closed structure, in which gas or vapor enters the inside of the container and causes an explosion In some cases, it is specified that the container withstands explosive pressure and that the flame from the explosion does not ignite the gas or vapor outside the container. In addition, for the purpose of preventing the transmission of a flame to the outside of the container, the dimensions and precision of the container, such as the depth of the joint surface and the clearance of the joint surface, are specified in detail.

[0003]

However, since the explosion-proof container of such electric equipment has a completely closed structure,
Once moisture enters the inside of the container, it is hard to be discharged to the outside and water is easily stored inside. In other words, even if the joints are sufficiently sealed with packing or the like, it is explosion-proof if it is installed outdoors, for example, if it is exposed to intense rain, or if water enters the container once due to the suction effect of water due to the temperature difference inside and outside the container. In a structural container, the structure is limited by regulations, and it is substantially difficult to provide a drainage passage for discharging moisture, so that water accumulates inside the container. Therefore, there is a possibility that the water stored inside may cause a malfunction in the performance of the electric device.

The present invention has been made in view of such circumstances, and has an explosion-proof structure capable of suppressing the accumulation of water inside a container and reducing the occurrence of malfunctions of electric equipment due to water. It is an object of the present invention to provide a moisture intrusion prevention system for containers.

[0005]

Means for Solving the Problems To solve the above problems, an invention according to claim 1 is a moisture intrusion prevention system for an explosion-proof structure container, which detects a liquid that has entered the explosion-proof structure container of an electric device. A technique including a liquid detecting unit and a notifying unit for notifying the intrusion of the liquid into the container from the detection result of the liquid detecting unit is employed. This explosion-proof container moisture intrusion prevention system detects liquid that has penetrated the container of electrical equipment with liquid detection means and reports it with the notification means, so it is necessary to remove the liquid from the container at the time of notification. Thus, it is possible to suppress accumulation of the liquid in the container.

According to a second aspect of the present invention, there is provided the moisture intrusion prevention system for an explosion-proof container according to the first aspect, wherein the container is provided with a groove for storing the liquid that has entered the container, The means adopts a technique of being attached so as to detect the liquid in the groove. In this moisture intrusion prevention system for an explosion-proof container, a groove for storing the liquid that has entered the container is provided, and the liquid in the groove is detected by the liquid detection means. Therefore, the liquid can be accurately and stably detected by the liquid detecting means.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
In the water intrusion prevention system for an explosion-proof container, a technique is adopted in which a plurality of spaces are provided in the container, and the liquid detecting means is attached to at least one of the spaces. In the moisture intrusion prevention system for an explosion-proof container, the liquid detecting means is attached to at least one of the plurality of spaces. Therefore, the liquid detecting means is attached to a space where liquid easily enters, and the device is attached to a space where it is not. Thus, it is possible to reliably detect the intrusion of the liquid by the liquid detection unit before water is stored in the space of the device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a moisture intrusion prevention system for an explosion-proof container according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of a moisture intrusion prevention system for an explosion-proof container according to this embodiment. The system according to the present embodiment is used in a plant for liquefied gas such as LNG, for example. When water enters the container 11 of the electric device 10 installed in the explosion-proof area, a defect occurs in the electric device 10. It is intended to suppress such a situation. Further, the system includes a liquid detecting means 12 for detecting the liquid which has entered the container 11, and a notifying means 13 for notifying the intrusion of the liquid into the container 11 to the outside of the container 11 based on the detection result of the liquid detecting means 12. And

As shown in FIG. 2, the electric device 10 is a motor-operated valve 20 used for piping equipment of a plant.
(Hereinafter referred to as an electric actuator). When a signal is received through the terminal box 21, the motor 22 is driven through a relay or the like inside the container 11 to open and close the electric valve 20. I have.

Since the electric device 10 is installed in an explosion-proof area, the container 11 has an explosion-proof structure. For this reason, the dimensions and accuracy of the container 11 are specified in detail, such as the depth of the joint surface and the clearance of the joint surface.

As shown in FIG. 3, the container 11 includes a container body 30 serving as a base, a first cover 31 attached so as to cover one surface of the container body 30, and a container body 3.
A terminal box 32 is attached to a predetermined surface of the terminal box 32 via a packing (not shown), and a second cover 33 is attached to cover one surface of the terminal box 32. A device such as a relay 34 is installed in the first space SP1 formed by being covered with the first cover 31, and a terminal block 35 is installed in the second space SP2 formed by being covered by the second cover 33. Have been. This container 11
Is designed to prevent the invasion of moisture from the outside by using packing or the like, but because it is installed outdoors, it is exposed to severe rain and wind, and water is sucked due to a temperature difference between the inside and outside of the container 11. Due to the action or the like, water is removed from the joint surface between the container body 30 and the first cover 31, for example.
1 may enter. In this case, the first space SP1 having a larger bonding surface area has a larger amount of water entering than the second space SP1. Further, here, it is assumed that the terminal block 35 is more susceptible to inconvenience due to being immersed in water than the relay 34.

The first space SP1 of the container 11 is provided with a groove 36 for storing the water that has entered the space, and the groove 36 is provided with the liquid detecting means 12 described above. As shown in FIG. 4, the liquid detecting means 12
A detection band 37 composed of two conductive cores, and a circuit unit 3 for supplying a voltage to the detection band 37 and amplifying a current
And 8. When the space between the two core wires of the detection band 37 is immersed in a conductive liquid (for example, water), an alternating current flows through the liquid, and the circuit unit 3
At 8, the current is amplified and a signal is output.
In addition, as shown in FIG.
Is mounted at a predetermined height from the bottom of the groove 36 so as not to malfunction due to water drops or the like.

Returning to FIG. 1, the notifying means 13 includes an alarm device 40 for issuing an alarm in a predetermined room near the plant equipment, and a monitor provided with a display unit 42 in a central control room 41 for controlling and managing the entire plant equipment. The device 43 is included. The alarm 40 emits an alarm at a predetermined volume when receiving the output of the detection result from the liquid detecting means 12. Further, when receiving the output of the detection result from the liquid detection means 12, the monitoring device 43 displays the result on the screen of the display unit 42 and issues an alarm at a predetermined volume in the central control room 41. ing. Further, the liquid detecting means 12 is installed in a container of a plurality of electric devices installed in the explosion-proof area, and the monitoring device 43 can determine which electric device is the signal from the liquid detecting means 12 and detect the liquid. The detected electrical device is specified and displayed on the screen of the display unit 42.

Next, the operation of the moisture intrusion prevention system for an explosion-proof container configured as described above will be described.
In FIG. 1, at least when power is supplied to the plant equipment, a voltage is supplied to the liquid detection unit 12,
The system is maintained in a state of monitoring the liquid in the container 11 of the electric device 10.

The container 1 is exposed to intense rain and wind, or water is sucked by the temperature difference between the inside and outside of the container 11.
When the water enters the container 1, the water flows into the groove 36 (see FIG. 3) in the container 11. When a predetermined amount of water is stored in the groove portion 36 and the liquid detecting means 12 detects water, the alarm device 40 and the monitoring device 43 in the central control room 41 generate an alarm, and the monitoring device 43 further displays on the screen of the display portion 42. Which of the electric devices 10 has the water 11 entered therein is displayed. Thus, the operator opens the cover of the container 11 of the electric device 10 displayed on the screen of the display unit 42 to perform an inspection, and removes water inside the container 11.

Thus, it is possible to prevent that a predetermined amount of water is stored in the container 11 shown in FIG. 3 and that the performance of the equipment such as the relay 34 and the terminal block 35 is adversely affected by the water being immersed in the water. be able to. Further, in the present embodiment, the terminal block 35 is immersed in water, so that there is a high possibility that the insulation failure occurs and the signal exchange of the electric device 10 is not performed normally, but the terminal block 35 stores the liquid. Since the water is stored in the second space SP2 different from the first space SP1, the water stored in the container 11 immediately returns to the second space S2.
Since it does not flow into P2, it is possible to suppress the possibility that the terminal block 35 will be immersed in water and insulation failure will occur, and a problem that signal exchange will not be performed normally will occur.

After removing the water from the container 11, the operator closes the cover of the container 11. Then, the system continues to maintain the state of monitoring the liquid in the container 11 of the electric device 10 as it is.

As described above, according to the moisture intrusion prevention system for an explosion-proof structure container of the present embodiment, the container 1
In order to detect the liquid that has entered the inside 1 by the liquid detecting means 12 and to notify the same by the notifying means 13, by removing the liquid in the container 11 at any time when the notification is made, it is possible to prevent the liquid from being stored in the container 11. Can be suppressed. Moreover, the container 11
The inside is configured such that the intruded liquid is stored in the groove 36, and therefore, by detecting the liquid in the groove 36, it is possible to detect the liquid accurately and stably.

Further, in the moisture intrusion prevention system for the explosion-proof structure container of the present embodiment, the first space SP1 having the groove portion 36 for storing the liquid and the second space SP2 where the terminal block 35 which causes a problem due to the liquid is installed. Are formed in the container 11 separately, so that the groove 36 in which the liquid is stored and the device (terminal block 35) in which a problem is likely to occur are arranged in another space, and the liquid is The possibility of affecting the device is reduced, and it is possible to reduce the occurrence of malfunction of the device due to the liquid.

The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements without departing from the gist of the present invention. That is, the present invention is not limited to the liquefied gas plant shown in the above-described embodiment, and can be applied to other apparatuses having an explosion-proof structure container that requires measures against water intrusion. . In the present embodiment, the electric device 10 is an electric actuator for an electric valve, but is not limited to this.
Other forms such as an electric cylinder may be used.

Further, the liquid detecting means 12 of the present embodiment
Although the detection band 37 has a conductive core wire, the invention is not limited to this, and a liquid may be detected by another method. For example, a configuration may be employed in which a groove is provided further deeply and a liquid level meter for detecting the liquid level is used, or a configuration utilizing a chemical reaction may be employed. Further, in the present embodiment, the relay 34
The relay 34 is installed in the same space as the groove 36.
May be installed in a space different from the liquid detecting means 12 similarly to the terminal block 35 to further reduce the possibility of occurrence of a malfunction of the device.

[0023]

As described above, according to the present invention, the following effects can be obtained. The water intrusion prevention system for an explosion-proof structure container according to claim 1 detects a liquid that has entered a container of an electric device and notifies the user of the liquid by removing the liquid in the container at any time when notified. Liquid can be prevented from accumulating in the interior. Therefore,
It is possible to reduce the occurrence of malfunctions of the electric device due to moisture.

In the water intrusion prevention system for an explosion-proof container according to the second aspect, the liquid that has entered the container is stored in the groove, and the liquid in the groove is detected. can do.

In the moisture intrusion prevention system for an explosion-proof container according to the third aspect, a plurality of spaces are formed in the container, and the liquid detecting means is attached to at least one of the spaces. By installing the liquid detection means and installing the equipment in the space where it is not,
Before the water accumulates in the space of the device, it is possible to reliably detect the intrusion of the liquid by the liquid detection means, thereby further reducing the occurrence of malfunctions of the device due to the liquid.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of an embodiment of a moisture intrusion prevention system for an explosion-proof container according to the present invention.

FIG. 2 is a side view showing an outline of the electric device of FIG.

FIG. 3 is a cross-sectional view illustrating a structure of a container of the electric device of FIG.

FIG. 4 is a diagram illustrating a configuration of a liquid detection unit in FIG. 1;

FIG. 5 is a perspective view showing a state in which a liquid detection unit is mounted in the container of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric apparatus 11 Container 12 Liquid detection means 13 Notification means 34 Relay 35 Terminal block 36 Groove part 40 Alarm 41 Central control room 42 Display part 43 Monitoring device SP1 1st space SP2 2nd space

Claims (3)

[Claims] 1. A liquid detecting means for detecting a liquid that has entered a container of an explosion-proof structure of an electric device, and a notifying means for notifying the intrusion of the liquid into the container to the outside of the container based on a detection result of the liquid detecting means. And a moisture intrusion prevention system for explosion-proof containers. 2. The container according to claim 1, wherein a groove is provided for storing the liquid that has entered the container, and the liquid detecting means is attached to detect the liquid in the groove. Item 2. An anti-moisture penetration system for an explosion-proof container according to Item 1. 3. The explosion-proof structure according to claim 1, wherein a plurality of spaces are provided in said container, and said liquid detecting means is attached to at least one of said spaces. system.