JP2011115000A - Corrosive gas countermeasure device and hermetic type housing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosive gas countermeasure device and a hermetic type housing that can protect an electric apparatus against corrosion by a corrosive gas, even if the hermetic type housing that houses the electric apparatus is disposed in an environment containing a high level of corrosive gas. <P>SOLUTION: The corrosive gas countermeasure device 9 is disposed in the housing 2 of a self-supporting closed panel 1, and a sirocco fan 15B is whirled to suck in outside air containing a corrosive gas through bolt holes 5A to 5D and an outside air introduction port 7 via outside air introduction pipes 11A to 11E and to suck in inside air through an inside air introduction port 14A via an inside air introduction pipe 14. Compared with an axial fan, the sirocco fan can obtain a stable air flow even if a pressure loss changes. The inside air and the outside air are stirred and mixed at a predetermined mixing ratio in an air intake unit 15 to attenuate the corrosive gas contained in the outside air by the inside air to reduce the level of the corrosive gas. An absorption unit 16 uses a chemisorption agent that does not desorp the sorbed corrosive gas, thereby the corrosive gas can be removed efficiently. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a corrosive gas countermeasure device that is attached to a sealed housing that houses electrical equipment, and a sealed housing that includes this device.

  In the sewage treatment facility and the waste disposal facility, a self-sustained closing board and a monitoring console are installed for controlling and monitoring devices and machines for treating sewage and waste.

  Conventionally, an invention for an air purification device for a switchboard comprising a fan and an adsorption filter in order to prevent corrosive gas such as hydrogen sulfide generated from sewage and garbage from entering and corroding electrical equipment in the switchboard Is disclosed (see Patent Document 1).

JP 2000-115923 A

  However, when the switchboard provided with the air purification device described in Patent Document 1 is installed in an atmosphere containing a high concentration of corrosive gas, corrosive gas entering from a minute gap such as a door gap or a cable inlet is not generated. Since the amount cannot be ignored, there is a problem that a sufficient effect cannot be obtained.

  Therefore, the present invention provides a corrosive gas that prevents an electric device from being corroded by a corrosive gas even when a sealed casing that houses the electric device is installed in an atmosphere containing a high concentration of corrosive gas. It is an object of the present invention to provide a countermeasure device and a sealed casing provided with the device.

  (1) The present invention is a corrosive gas countermeasure device that is attached to a hermetically sealed housing that houses electrical equipment, and includes suction means and adsorption means. The suction means sucks outside air that is air outside the housing and inside air that is air inside the housing, and mixes the outside air and the inside air to generate mixed air. The adsorbing means adsorbs the corrosive gas through the mixed air and exhausts it into the housing.

  If a sealed housing that contains electrical equipment is installed in an atmosphere containing a high concentration of corrosive gas, the corrosive gas enters the housing from the gap of the housing and the electrical equipment is corroded by the corrosive gas. End up. Since the corrosive gas countermeasure device of the present invention sucks the outside air of the sealed housing and exhausts it into the housing, the internal pressure of the housing becomes higher than the external pressure, and the outside air can be prevented from entering. When the outside air containing corrosive gas is sucked into the housing, the electrical equipment is corroded, and therefore the corrosive gas needs to be removed. Further, if the concentration of corrosive gas contained in the outside air is high, the adsorbing means cannot adsorb efficiently, and part of the corrosive gas may not be adsorbed. The corrosive gas countermeasure device according to the present invention generates a mixed air in which the outside air containing a corrosive gas is diluted with an inside air not containing a corrosive gas to reduce the concentration of the corrosive gas, and the mixed air is supplied to the adsorption means. Pass through. Therefore, the adsorbing means adsorbs corrosive gas efficiently, so that no adsorption leakage of corrosive gas occurs, and a sealed housing that houses electrical equipment is installed in an atmosphere containing highly concentrated corrosive gas. Even so, the electrical equipment can be prevented from being corroded by the corrosive gas.

  (2) In the present invention, the corrosive gas countermeasure device includes an outside air introduction pipe and an inside air introduction pipe. The outside air introduction pipe connects an outside air introduction port for sucking outside air outside the housing and a suction means. The inside air introduction pipe is provided at a position away from the suction means by a predetermined distance, and connects the inside air introduction port for sucking the inside air in the housing and the suction means.

  Since the gas countermeasure device introduces outside air through the outside air introduction pipe, the internal pressure of the housing can be made higher than the outside pressure by introducing outside air into the housing without the electrical equipment touching the outside air containing corrosive gas. . Further, by introducing the inside air from a position away from the suction means by a predetermined distance, the position for sucking the inside air is separated from the position for exhausting the mixed air, so that the air in the housing can be circulated.

  (3) In this invention, the suction means is attached to the opening provided in the casing from the outside of the casing, and the suction means is attached to the opening from the inside of the casing and connected to the suction means. And an inside air introduction tube for sucking inside air from the inside of the housing.

  With such a configuration, the corrosive gas countermeasure device can be attached even to an existing housing without a space for mounting the corrosive gas countermeasure device inside.

  (4) In the present invention, the gas countermeasure device includes a measuring unit, a monitoring unit, and an alarm unit. The measuring means measures a pressure difference between the outside of the housing and the inside of the housing. The monitoring means detects the stop of the suction means. The alarm means outputs an alarm when the pressure difference measured by the measuring means falls below a preset threshold value or when the monitoring means detects the stop of the suction means. In this way, not only detecting whether or not the suction means is stopped, but also measuring the difference in pressure between the external pressure and the internal pressure of the housing, thereby generating an abnormality such as the suction means not operating normally. It can be detected. Therefore, it is possible to reliably detect an abnormality in the gas countermeasure device and prevent the electrical equipment in the housing from being corroded by the corrosive gas.

  (5) In this invention, the suction means includes a sirocco fan. The adsorption capacity of the adsorption means for adsorbing the corrosive gas also depends on the wind speed of the passing air. On the other hand, the pressure loss when sucking outside air to make the internal pressure of the housing higher than the external pressure varies depending on the degree of sealing of the housing. Since the sirocco fan can obtain a stable air volume even when the pressure loss changes, the sirocco fan can stably adsorb the corrosive gas by the adsorption means.

  (6) In this invention, the adsorption means includes a chemical adsorbent. The chemical adsorbent substitutes the adsorbed corrosive gas with another substance by a chemical reaction. Therefore, the adsorbing means can reliably remove the corrosive gas without desorbing the adsorbed corrosive gas even in the sealed casing.

  (7) In the present invention, a hermetically sealed housing that houses electrical equipment includes the corrosive gas countermeasure device according to any one of (1) to (6) and a cable entry port through which a cable is drawn from the outside. Yes. The cable entry port is attached with a split lid that covers the entire cable and is formed with multiple cutouts of the same shape as the cable to be pulled in from the outside, and the cable and cutout are placed around the cable sandwiched between the cutouts. A caulking agent that fills the gaps between them is applied.

  As a result, there is no gap at the cable entry port, and the entry of outside air can be prevented, and further, the entry of outside air can be reliably prevented by the corrosive gas countermeasure device.

  According to the present invention, even if a sealed housing that houses electrical equipment is installed in a high-concentration corrosive gas atmosphere, the electrical equipment in the housing can be prevented from being corroded by corrosive gas.

It is the upper side figure and right side perspective drawing of a self-supporting closing board provided with the corrosive gas countermeasure device. It is a graph which shows the relationship between the air volume and static pressure of a sirocco fan and an axial fan. It is a block diagram which shows the structure which detects abnormality of a corrosive gas countermeasure apparatus. (A) is an overview of a conventional lid, (B) is an overview of a conventional cable inlet, (C) is an overview of a split lid in the present invention, and (D) is a cable inlet in the present invention. FIG. It is a table | surface which shows the gas-permeation coefficient of various materials. It is a right side perspective view of an existing housing. (A) is a top cross-sectional view of an existing housing provided with a gas countermeasure device (cross-sectional view taken along line AA in FIG. 7B), and (B) is a right side perspective view of the existing housing provided with a gas countermeasure device. (C) is an external view of the rear surface of an existing housing provided with a gas countermeasure device, (D) is an external view of a mounting surface of the corrosive gas countermeasure unit, and (E) is an existing structure with the corrosive gas countermeasure unit removed. FIG. It is the right side perspective drawing of the monitoring console provided with the corrosive gas countermeasure apparatus.

  In the following description, an example will be described in which the corrosive gas countermeasure device according to the embodiment of the present invention is provided in a self-supporting closing panel and a monitoring console.

[When a corrosive gas countermeasure device is installed inside the self-supporting closed panel]
First, an embodiment in which a corrosive gas countermeasure device is attached to the inside of a self-supporting closing board will be described. As shown in FIG. 1, the self-supporting closing board 1 includes a front door 3 </ b> A on the front side of the housing 2 and a back door 3 </ b> B on the back side of the housing 2. A cooling device 4 is attached to the back door 3B. The cooling device 4 cools the inside of the housing 2 when the temperature rise in the panel due to the heat generated by the electrical equipment is large due to the sealing of the self-supporting closed panel 1, and is preferably a cooler or a heat exchanger. When a cooler is used, it is desirable to attach an air cut valve 4A in order to prevent outside air from being sucked from the drain pipe 4B.

  In addition, the self-supporting closing board 1 includes an electrical device housing portion 8A and a electrical device housing portion 8B that house a plurality of electrical devices that control a processing device such as sewage and dust inside a sealed casing 2. A corrosive gas countermeasure device (hereinafter referred to as a gas countermeasure device) 9 is installed between the electrical device housing portion 8A and the electrical device housing portion 8B.

  The gas countermeasure device 9 includes an outside air introduction pipe 11A to an outside air introduction pipe 11E (only the outside air introduction pipes 11A and 11B are shown in FIG. 1), a dust filter 12, an outside air supply pipe 13, an inside air introduction pipe 14, and an intake unit. 15, an adsorption unit 16, an exhaust port 17, and an abnormality detection unit 18 are provided. The inside air introduction pipe 14 is provided with an inside air introduction port 14A at its end. The intake unit 15 corresponds to the suction means of the present invention, and includes an inside air / outside air ratio adjuster 15A, a sirocco fan 15B, and an inside air inlet 15C. The adsorption unit 16 corresponds to the adsorption means of the present invention, and includes a first adsorption unit 16A filled with a chemical adsorbent and a second adsorption unit 16B having an adsorption filter containing the chemical adsorbent. The abnormality detection unit 18 includes a rotation detection sensor 18A (not shown in FIG. 1) for detecting the rotation of the sirocco fan 15B, and a fine differential pressure sensor 18B (not shown in FIG. 1) for detecting a pressure difference between the inside and outside of the housing 2. (Not shown) and an alarm unit 18C (not shown in FIG. 1).

  The front door 3A and the rear door 3B of the housing 2 have a structure that can be opened and closed like a door, and the housing 2 on the rear surface side of the front door 3A so as to be in close contact with the housing 2 when the front door 3A is closed. A rubber packing (not shown) is attached to the abutting portion. The back door 3B is processed similarly. Moreover, the opening part and hole provided in the wall surface of the housing | casing 2 are sealed except what is required. However, outside air containing corrosive gas may enter the housing 2 from a slight gap between the front door 3A and the back door 3B. Therefore, the gas countermeasure device 9 sucks air outside the housing 2 (hereinafter referred to as “outside air”) and exhausts the air inside the housing 2, thereby reducing the internal pressure of the housing 2 (atmospheric pressure in the housing). It is higher than the external pressure (atmospheric pressure outside the housing) to prevent outside air from entering through the gaps in the housing 2. Further, the gas countermeasure device 9 removes the corrosive gas contained in the sucked outside air by the adsorption unit 16.

  As holes for sucking outside air to the inside of the housing 2, there are suspension bolt mounting holes 5 </ b> A to 5 </ b> D provided on the ceiling surface of the housing 2 and a cable entry port 6 provided on the bottom surface of the housing 2. It is good to use. Since the suspension bolt mounting holes (hereinafter referred to as bolt holes) 5A to 5D are through holes, the outside air can be brought into the inside of the housing 2 without performing new hole processing by using these holes as outside air introduction ports. Can suck. Moreover, since the split lid 21 is normally attached to the cable inlet 6 provided in the bottom face of the housing | casing 2, it is good to process this split lid 21 and to provide the external air introduction port 7. FIG. The split lid 21 is easy to process, and the outside air inlet 7 can be created in a short time.

  In addition, when the bolt hole is not provided in the ceiling surface of the self-standing closure board 1 or when there is no space for providing the outside air introduction port 7 in the split lid 21 attached to the cable entry port 6, the wall surface of the housing 2 is provided. It is preferable to provide an outside air introduction port by performing hole processing.

  The outside air introduction pipes 11A to 11D are connected to the bolt holes 5A to 5D, respectively, and the outside air introduction pipe 11E is connected to the outside air introduction port 7.

  The inside air introduction port 14A is installed between the bottom surface of the housing 2 and the electric device accommodating portion 8B in order to suck air inside the housing 2 (hereinafter referred to as inside air). The inside air inlet 14A may be provided at a position away from the gas countermeasure device 9 by a predetermined distance. As a result, the air in the housing 2 circulates and the air passes around the electrical equipment and inside the equipment, so that the corrosive gas that has entered during opening and closing of the front door 3A and the rear door 3B can be efficiently removed. In addition, heating of the electric device can be suppressed. Moreover, although illustration is abbreviate | omitted, you may provide an internal air introduction pipe | tube so that an internal air inlet may be located between the electric equipment accommodating part 8B and the ceiling surface of the housing | casing 2, for example. Thereby, the air of the upper part in the housing | casing 2 can also be circulated efficiently.

  The outside air introduction pipe 11A to the outside air introduction pipe 11E and the inside air introduction pipe 14 may be flexible pipes such as hoses. Thereby, piping can be performed easily.

  The gas countermeasure device 9 has a structure in which the air is sucked from the bolt holes 5A to 5D, the outside air introduction port 7, the inside air introduction port 14A, and the inside air intake port 15C and is exhausted from the exhaust port 17. Air is not exhausted outside. Further, the corrosive gas is removed (adsorbed) by the adsorption unit 16 from the air sucked by the gas countermeasure device 9. Thereby, the external air taken into the housing | casing 2 by the gas countermeasure apparatus 9 does not touch an electric equipment, and it can prevent that an electric equipment is corroded by the corrosive gas contained in external air.

  When the sirocco fan 15B starts operation (rotation), outside air is sucked from the bolt holes 5A to 5D and the outside air introduction port 7. The sucked outside air passes through the outside air introduction pipes 11 </ b> A to 11 </ b> E and is sent to the dust removal filter 12, and dust and dust are removed by the dust removal filter 12. The removed outside air passes through the outside air supply pipe 13 and is sent to the intake unit 15.

  When the sirocco fan 15B starts to operate (rotates), the inside air is sucked from the inside air introduction port 14A of the inside air introduction tube 14 and the inside air intake port 15C of the intake unit 15. The inside air sucked from the inside air introduction port 14 </ b> A passes through the inside air introduction pipe 14 and is sent to the intake unit 15.

  The intake unit 15 agitates and mixes the sucked inside air and outside air with the sirocco fan 15B to generate mixed air. The mixed air is sent to the adsorption unit 16.

  The adsorption efficiency of the chemical adsorbent used in the adsorption unit 16 depends on the concentration of the corrosive gas, and the lower the corrosive gas concentration, the higher the adsorption efficiency. Further, if the outside air is allowed to pass through the adsorption unit 16 as it is, the adsorption efficiency may be poor and the corrosive gas may not be completely adsorbed (removed). Therefore, the gas countermeasure device 9 sucks not only the outside air but also the inside air containing almost no corrosive gas, mixes the outside air and the inside air to generate mixed air, and passes the mixed air through the adsorption unit 16. As a result, since the corrosive gas contained in the outside air is diluted by the inside air, the concentration of the corrosive gas can be reduced to improve the adsorption efficiency of the adsorbent, and the corrosive gas contained in the passing mixed air can be reduced. It can be completely adsorbed (removed).

  The inside air / outside air ratio adjuster 15A includes an adjuster that adjusts the suction amount of the inside air and the outside air, and can adjust the ratio between the inside air and the outside air of the mixed air. The mixing ratio of the inside air and the outside air varies depending on the proportion of the corrosive gas contained in the outside air, but the proportion of the inside air may be larger than that of the outside air. For example, at 95% (inside air) and 5% (outside air), the corrosive gas can be completely removed from the mixed air.

  The inside air / outside air ratio adjuster 15A is provided with an adjustment mechanism so that the mixing ratio of the inside air and the outside air can be changed according to an operation in an operation unit (not shown), and detects the ratio of corrosive gas contained in the sucked outside air. A means may be provided so that the mixing ratio of the inside air and the outside air can be automatically changed according to the ratio of the corrosive gas.

The adsorption unit 16 uses a chemical adsorbent having adsorption (removal) performance according to the type of corrosive gas contained in the outside air. The chemical adsorbent has a larger capacity for removing corrosive gas than the activated carbon filter, and removes corrosive gas by chemical reaction (oxidation reduction reaction, neutralization reaction, catalytic reaction, physical adsorption, etc.). For example, when the corrosive gas is hydrogen sulfide, it is removed by substituting with another substance as shown in the following reaction formula.
2H ₂ S + 4KMnO ₄ + O ₂ → 2K ₂ SO ₄ + 4MnO ₂ + 2H ₂ O
The above reaction formula is an irreversible reaction, and the adsorbed hydrogen sulfide is not re-released (desorbed).

  The adsorption unit 16 has a two-layer structure. The first adsorption unit 20A of the first layer is filled with a granular chemical adsorbent, and the second adsorption unit 20B of the second layer is made of fibers containing the chemical adsorbent. Adsorption filter is used. With this configuration, the first adsorption unit removes corrosive gas that passes around the particles of the chemical adsorbent, and the second adsorption unit removes corrosive gas that could not be removed by the first adsorption unit. Therefore, the corrosive gas can be removed efficiently and reliably.

  In addition to hydrogen sulfide, the corrosive gas includes sulfur dioxide, nitrogen oxides, chlorine, ammonia, ozone, etc. The chemical adsorbent and adsorption filter used in the adsorption unit 16 are corrosive gases contained in the outside air. Accordingly, a chemical adsorbent that adsorbs the corrosive gas may be used. Chemical adsorbents and adsorption filters have a limit on the amount of corrosive gas adsorbed and can be exchanged.

  Next, the adsorption capacity of the adsorption unit 16 also depends on the wind speed of the passing air. On the other hand, the pressure loss when sucking (introducing) the outside air in order to make the internal pressure of the housing 2 higher than the external pressure varies depending on the degree of sealing of the self-supporting closing plate 1. Therefore, in order to stably adsorb the corrosive gas to the adsorption unit 16, it is necessary to stabilize the wind speed of the air passing through the adsorption unit 16 without being influenced by the change in the pressure loss. In the present invention, a sirocco fan is employed as a fan that satisfies the above conditions. Hereinafter, a description will be given with reference to FIG.

  FIG. 2 shows the characteristics of model: SX2120 (custom product), DC24V, Yonago Shinko as an example of a sirocco fan, and models: TE-420, AC100V50Hz, manufactured by Royal Electric, as an example of an axial fan. .

In the example shown in FIG. 2, the pressure loss of the adsorption unit 16 is about 30 Pa. At this time, in order to make use of the effect of the adsorbent, it is necessary to stabilize the air volume at around 0.8 m ³ / min. Further, when the outside air introduction amount is changed, the pressure loss changes, but the change in the air amount needs to be stabilized at about 0.8 m ³ / min.

In the example shown in FIG. 2, both the sirocco fan and the axial fan have an air volume of approximately 0.8 m ³ / min when the pressure loss is 30 Pa. However, the sirocco fan has less air volume change (horizontal axis direction) due to a change in static pressure (vertical axis direction in FIG. 2) than the axial fan, and the air volume is stable. By providing the sirocco fan, the gas countermeasure device 9 can obtain a stable air volume even if the pressure loss changes.

  The mixed air from which the corrosive gas has been removed by the adsorption unit 16 is exhausted from the exhaust port 17, circulates inside the housing 2, and is sucked from the internal air introduction port 14 </ b> A and the internal air intake port 15 </ b> C.

  The gas countermeasure device 9 uses a rotation detection sensor 18A and a slight differential pressure sensor 18B connected to an alarm unit 18C of the abnormality detection unit 18 to corrode the outside air due to a decrease in the internal pressure of the housing 2 or a stop of the sirocco fan 15B. Gas is prevented from entering the housing 2. As shown in FIG. 3, the rotation detection sensor 18A corresponds to the monitoring means of the present invention, detects the rotation of the sirocco fan 15B, and outputs a signal when the rotation stops. Further, the fine differential pressure sensor 18B corresponds to the measuring means of the present invention, monitors the pressure difference between the internal pressure and the external pressure of the housing 2, and outputs a signal when the pressure is below a preset threshold value (10 Pa as an example). . In this way, by monitoring the pressure difference between the internal pressure and the external pressure of the housing 2, the sirocco fan 15B malfunctions, the bolt holes 5A to 5D, the outside air inlet 7 and the dust filter 12 are clogged, and the front door 3A. In addition, it is possible to detect a decrease in the adhesion of the open / close cleaning of the rear door 3B. The alarm unit 18C corresponds to the alarm means of the present invention, and when detecting that the rotation detection sensor 18A or the fine differential pressure sensor 18B outputs a signal, the alarm signal corresponding to the content detected by the sensor is sent to the monitoring console 71. Output. In response to the alarm signal received from the alarm unit 18C, the monitoring console 71 displays on the display unit (not shown) that the sirocco fan 15B has failed or the internal pressure of the housing 2 has decreased. Is notified of the occurrence of an abnormality.

  In order to monitor the external pressure with the micro-differential pressure sensor 18B, an external pressure measurement unit (not shown) is allowed to pass through the outside air introduction pipe and extend to the outside of the housing 2, or the split lid 21 (not shown) is processed. The external pressure measurement unit may be extended to the outside of the housing 2.

  A time limit timer 19 is connected to the alarm unit 18C, and by limiting the output of the alarm unit 18C until the start-up of the gas countermeasure device 9 at the start of operation, abnormal output due to erroneous detection is prevented. The time timer 19 is set to 10 seconds as an example of the output time limit.

  As described above, since the gas countermeasure device 9 includes the abnormality detection unit 18 and can detect a functional abnormality, the effect of the corrosive gas countermeasure can be continuously maintained.

  Next, in the present invention, the cable inlet 6 is processed to prevent the outside air from entering. As shown in FIG. 4, a plurality of cables are drawn into the inside of the housing 2 from the cable inlet 6 provided on the bottom surface of the housing 2, but conventionally, as shown in FIG. The notch 122 was provided in the split lid 121A and the split lid 121B having the same shape. Then, as shown in FIG. 4B, the two split lids 121A and 121B are attached to the cable entry port 6, the plurality of cables 23 are drawn from between the notches 122, and the plurality of cables 23 are bundled. The caulking agent 124 was applied around the cable. In this cable insertion method, in an environment where corrosive gas is contained in the outside air, gaps 125 are formed between the plurality of cables 23, and therefore corrosive gas may enter the inside of the housing 2 from the gaps 125. . Further, when a plurality of cables 23 are bundled in this way, it is difficult to completely fill the gaps 125 between the cables with the caulking agent 124.

  Therefore, in the present invention, the shape of the split lid attached to the cable inlet 6 is changed. That is, as shown in FIG. 4 (C), semi-circular cutout portions 22 having substantially the same shape as the cables are arranged so that each of the split lids 21 is sandwiched one by one. A plurality of them are formed along the longitudinal direction. Then, as shown in FIG. 4D, the cables 23 are sandwiched one by one by the cutout portions 22 of the split lid 21A and the split lid 21B having the same shape, and the split lid 21A and the split lid 21B are connected to the cable inlet 6 A plurality of sheets are attached so as to cover the whole (an example in which a total of six split lids are attached is shown in FIG. 4D). At this time, the split lids 21A and 21B are brought into close contact with each other so that no gap is formed, and the caulking agent 24 is applied around the cable 23 so as to fill the gap between the cable 23 and the split lids 21A and 21B. With this configuration, the gap 125 cannot be formed as in the prior art, and the workability is improved and the caulking agent can be easily applied, so that intrusion of outside air can be reliably prevented.

  As the split lid 21, a vinyl chloride plate, a phenol resin plate, a plate made of iron or aluminum (metal plate) may be used. Further, the size of the notch 22 is preferably changed according to the size of the cable drawn from the cable entry port 6.

  As the caulking agent, urethane-based ones such as Orton Sealer 101RF (manufactured by Auto Chemical Industry) and epoxy-based ones are preferable. The table shown in FIG. 5 is an excerpt from “Corrosion and Corrosion Prevention Q & A for Electronic Equipment Parts” edited by the Foundation for Corrosion and Corrosion Protection, 1st Edition, Maruzen Co., Ltd., issued April 25, 2006, page 81. As shown in this table, when the corrosive gas is hydrogen sulfide, the gas permeability coefficient is very low for polyurethane and epoxy as compared with silicone. For this reason, urethane-based and epoxy-based caulking agents have low gas permeability and are suitable for preventing the invasion of corrosive gases. The urethane caulking agent is easy to remove and has excellent workability.

  As described above, since the gap between the cable inlets can be eliminated, the sealing degree of the freestanding board can be kept high, and the invasion of corrosive gas can be surely prevented.

  As described above, by providing the gas countermeasure device in the self-supporting closed panel, it is possible to prevent the corrosive gas contained in the outside air from entering and to prevent the electrical equipment housed in the casing from corroding. In particular, printed circuit boards, electronic components, and lead-free solders of electrical devices are easily corroded by corrosive gas, but this can be prevented. In addition, since the gas countermeasure device is small, if there is a space for installing the gas countermeasure device in the casing even if it is an existing self-closing panel, a gas countermeasure device can be added to prevent corrosive gas .

[When a corrosive gas countermeasure device is installed outside the self-supporting closed panel]
Next, an embodiment in which the gas countermeasure device is attached to the outside of the self-supporting closing board will be described. The self-closing closure plate 31 shown in FIG. 6 is an existing one, and cools the electrical equipment with the outside air sucked from the suction slit hole 34 provided in the lower portion of the front door 33A and passed through the dust filter 36, and the rear door 33B. The exhaust fan 37 forcibly exhausts air from an exhaust slit hole 35 provided in the upper portion of the air. If the corrosive gas is contained in the outside air, the corrosive gas enters the housing 32 and corrodes the electrical equipment, so that it is necessary to install a gas countermeasure device. However, the electric equipment accommodating part 38 is provided in the whole inside of the housing | casing 32, and there is no space which attaches the gas countermeasure apparatus 9 like the self-supporting closing board 1 shown in FIG. In such a case, as shown in FIG. 7, a corrosive gas countermeasure unit (hereinafter referred to as a gas countermeasure unit) 41 is attached to the outside of the self-supporting closed plate 31 to take a countermeasure against the corrosive gas.

  When attaching the gas countermeasure unit 41 to the self-supporting closing plate 31, the exhaust slit hole 35 that appears when the exhaust fan 37 is removed is used as it is without processing. In addition, in order to prevent outside air from entering the housing 32, a sealing metal fitting 47 is attached to the intake slit hole 34 to seal the intake slit hole 34.

  When the exhaust slit hole 35 is small in size and the air permeability is poor, or when the exhaust slit hole 35 is not provided, the periphery of the exhaust slit hole 35 may be cut to provide a rectangular hole.

  The gas countermeasure unit 41 accommodates the gas countermeasure device 50 inside a sealed case 42 (corresponding to the housing case of the present invention), and is provided in the housing 32 on the outside of the self-standing closure board 31. It attaches to the slit 35 for exhaust which is an opening part, and its circumference | surroundings. The gas countermeasure device 50 has substantially the same configuration as the gas countermeasure device 9. Therefore, detailed description of the overlapping parts is omitted.

  The gas countermeasure device 50 includes an outside air introduction port 43, a dust filter 51, an outside air introduction tube 52, an inside air introduction tube 53, an inside air introduction tube 54, an intake unit 55, an adsorption unit 56, an exhaust port 57, and an abnormality detection unit 58. Yes. The inside air introduction pipe 54 is connected to the inside air introduction pipe 53 via the connection part 39 and the connection part 40, and is provided with an inside air introduction port 54A at an end thereof. The intake unit 55 includes an inside / outside air ratio adjuster 55A, a sirocco fan 55B, and an air supply section 55C. The adsorption unit 56 includes a first adsorption unit 56A filled with a chemical adsorbent and a second adsorption unit 56B having an adsorption filter containing the chemical adsorbent. The abnormality detection unit 58 includes a rotation detection sensor 58A (not shown) that detects the rotation of the sirocco fan 55B, a fine differential pressure sensor 58B (not shown) that detects a pressure difference between the inside and outside of the housing 32, and an alarm unit 58C. (Not shown).

  The case 42 has a rectangular parallelepiped shape, and as shown in FIG. 6D, a surface (hereinafter referred to as an attachment surface) 42A facing the housing 32 has an opening of an air supply section 55C (corresponding to a suction means). 44 and an opening 45 of the connecting portion 40 are provided. As shown in FIG. 6C, an outside air inlet 43 is provided on the back side of the case 42. A dust filter 51 is attached to the outside air introduction port 43. The width W from the end of the opening 44 of the air supply part 55C to the end of the opening 45 of the connection part 39 is the same as the width W of the exhaust slit hole 35. Therefore, the opening 44 and the opening 45 can be attached in close contact with the exhaust slit hole 35 from the outside of the housing 32 without processing. The adsorption unit 56 (corresponding to the adsorption means) is attached to the exhaust slit hole 35 from the inside of the housing 32 and is connected to the air supply section 55C through the exhaust slit hole 35. The connecting portion 40 is also connected to a connecting portion 39 provided inside the housing 32 through the exhaust slit hole 35.

  The inside air introduction port 54 </ b> A of the inside air introduction pipe 54 is installed between the bottom surface of the housing 32 and the electric device housing portion 38.

  Although not shown, all the bolt holes provided in the ceiling portion of the housing 32 are sealed so that outside air does not enter. Although not shown, the cable entry port provided on the bottom surface of the housing 32 is processed as described based on FIGS. 4C and 4D, and the outside air does not enter.

  The gas countermeasure device 50 sucks air from the outside air introduction port 43 and the inside air introduction port 54 </ b> A, exhausts it from the exhaust port 57, and air is not exhausted outside the gas countermeasure device 50 from other than the exhaust port 57. Further, the corrosive gas is removed (adsorbed) by the adsorption unit 56 from the air sucked by the gas countermeasure device 50. Thereby, the external air taken into the housing | casing 32 by the gas countermeasure apparatus 50 does not touch an electric equipment, and it can prevent that an electric equipment is corroded by the corrosive gas contained in external air. Further, since the gas countermeasure device 50 sucks the outside air of the housing 32 and makes the internal pressure of the housing 32 higher than the external pressure, it is possible to prevent the outside air from entering through the gap of the housing 32 or the like.

  The gas countermeasure device 50 operates in the same manner as the gas countermeasure device 9, and when the sirocco fan 55 </ b> B starts to operate (rotate), the mixed air does not contain corrosive gas from the outside air inlet 43 and sucks outside air from the outside air inlet 43. Exhaust. The mixed air exhausted from the exhaust port 57 circulates inside the housing 32 and is sucked from the inside air introduction port 54A.

  The rotation detection sensor 58A (not shown), the fine differential pressure sensor 58B (not shown), and the alarm unit 58C (not shown) operate in the same manner as the rotation detection sensor 18A, the fine differential pressure sensor 18B, and the alarm unit 18C.

  In response to an alarm signal received from the alarm unit 58C (not shown), the monitoring console 71 displays on the display unit (not shown) that the sirocco fan 55B has failed or the internal pressure of the housing 32 has decreased. To notify the monitoring personnel of the occurrence of the abnormality.

  With the configuration described above, there is no space for installing the gas countermeasure device inside the housing, and an existing housing that does not contain corrosive gas can be retrofitted with a gas countermeasure unit on the outside of the housing. It becomes possible.

[When installing a corrosive gas countermeasure device on the monitoring console]
Next, an example in which the gas countermeasure device is attached to the monitoring console will be described. The gas countermeasure device 79 attached to the monitoring console 71 has substantially the same configuration as the gas countermeasure device 9 provided in the self-supporting closed panel 1. Therefore, detailed description of the overlapping parts is omitted.

  As shown in FIG. 7, the monitoring console 71 includes a casing 72B below the top panel 72A. The casing 72B includes a door 73A on the front side of the casing 72B and a door 73B on the back side.

  Further, the monitoring console 71 includes an electrical device accommodating portion 78 that accommodates a plurality of electrical devices that control a processing device such as sewage and dust and a self-standing closure board inside a sealed casing 72B. A gas countermeasure device 79 is installed between the door 73 </ b> A and the electric device housing portion 78.

  The gas countermeasure device 79 includes an outside air introduction port 80, a dust filter 81, an outside air introduction tube 82, an inside air introduction tube 84, an intake unit 85, an adsorption unit 86, an exhaust port 87, and an abnormality detection unit 88. The inside air introduction tube 84 includes an inside air introduction port 84A. The intake unit 85 includes an inside air / outside air ratio adjuster 85A, a sirocco fan 85B, and an inside air inlet 85C. The adsorption unit 86 includes a first adsorption unit 86A filled with a chemical adsorbent and a second adsorption unit 86B having an adsorption filter containing the chemical adsorbent. The abnormality detection unit 88 includes a rotation detection sensor 88A (not shown) that detects the rotation of the sirocco fan 85B, a fine differential pressure sensor 88B (not shown) that detects a pressure difference between the inside and outside of the housing 72B, and an alarm unit 88C. (Not shown).

  The monitoring console 71 has a rubber on a portion that comes into contact with the casing 72B on the back side of the door 73A and the door 73B so that the casing 72B and the door 73A and the door 73B are in close contact when the door 73A and the door 73B are closed. A packing (not shown) is attached. Further, openings and holes provided in the wall surface of the casing 72B are sealed except for necessary ones. Although not shown, the cable entry port provided on the bottom surface or the side surface of the housing 72B is configured as described based on FIGS. 4C and 4D, and the outside air enters. do not do.

  When installing the monitoring console 71 in the control room, the monitoring console 71 is spaced a certain distance from the wall of the room so that the door 73B on the back side of the monitoring console 71 can be opened and closed. It is preferable to provide the door 73B. A dust filter 81 is attached to the outside air inlet 80. In addition, one end of the outside air introduction pipe 82 is connected to the dust removal filter 81, and the other end of the outside air introduction pipe 82 is connected to the inside air / outside air ratio adjuster 85 </ b> A of the intake unit 85.

  The gas countermeasure device 79 has a structure in which the air is taken in from the outside air inlet 80, the inside air inlet 84A, and the inside air inlet 85C and is exhausted from the exhaust port 87, and air is exhausted outside the gas countermeasure device 79 from other than the exhaust port 87. Not. Further, the corrosive gas is removed (adsorbed) by the adsorption unit 86 from the air sucked by the gas countermeasure device 79. Thus, the outside air taken into the casing 72B by the gas countermeasure device 79 does not touch the electrical equipment, and the electrical equipment can be prevented from being corroded by the corrosive gas contained in the outside air. Further, since the gas countermeasure device 79 sucks the outside air of the housing 72B and makes the internal pressure of the housing 72B higher than the external pressure, it is possible to prevent the outside air from entering from the gap of the housing 72B.

  The inside air introduction port 84A may be provided at a position away from the gas countermeasure device 79 by a predetermined distance. In the configuration shown in FIG. 7, the inside air introduction port 84 </ b> A is provided at a position opposite to the gas countermeasure device 79 with the electric device housing portion 78 interposed therebetween. Thereby, the air in the housing 72B circulates, and the air passes around the electric equipment and inside the equipment, so that heating of the electric equipment can be suppressed.

  The gas countermeasure device 79 operates in the same manner as the gas countermeasure device 9, and when the sirocco fan 85B starts to operate (rotates), the air is sucked in from the outside air introduction port 80 and the mixed air does not contain corrosive gas from the exhaust port 87. Exhaust. The mixed air exhausted from the exhaust port 87 circulates in the housing 72B and is sucked from the internal air introduction port 84A.

  The rotation detection sensor 88A (not shown), the fine differential pressure sensor 88B (not shown), and the alarm unit 88C (not shown) operate in the same manner as the rotation detection sensor 18A, the fine differential pressure sensor 18B, and the alarm unit 18C. The notification unit 89 (not shown) indicates that the sirocco fan 85B has failed or the internal pressure of the housing 72B has decreased in accordance with an alarm signal received from the alarm unit 88C (not shown). ) To notify the monitor of the occurrence of an abnormality.

  With the above configuration, the monitoring console installed in the control room can also be equipped with a gas countermeasure device, and even if corrosive gas enters the control room, it prevents the electrical equipment in the monitoring console from being corroded. it can.

  As described above, the corrosive gas countermeasure device according to the embodiment of the present invention is provided in a housing such as a self-supporting closed panel or a monitoring console for storing electrical equipment, thereby being independent in a high-concentration corrosive gas atmosphere. Even when a closed panel or monitoring console is installed, corrosive gas can be prevented from entering the housing.

  The inventors installed a sealed casing equipped with the gas countermeasure apparatus of the present invention in an atmosphere containing a high concentration of corrosive gas, and operated the gas countermeasure apparatus for one month. The measurement results of the corrosive gas concentration inside and outside the housing are shown below. For the corrosive gas concentration, an eco-checker (manufactured by Fujitsu Cowerco) was used.

  The average concentration of the corrosive gas contained in the outside air was 140 ppb to 180 ppb for hydrogen sulfide gas, 0 ppb to 5 ppb for sulfurous acid gas, and 0 ppb to 5 ppb for chlorine gas. On the other hand, in the casing, the average concentration of the total corrosive gas was 0 ppb to 5 ppb.

  Moreover, in order to confirm corrosion, a silver metal piece, which is inferior in corrosion resistance to hydrogen sulfide gas, was installed as a sample inside and outside the housing for 1 week, and the change in state was confirmed. As a result, silver corrosion was significant outside the housing, but no silver corrosion was seen inside the housing. In addition, the electrical equipment installed in the case did not corrode naturally and operated normally.

  From such a result, it is possible to maintain the environment of Class A, which is defined by JEITA IT-1004 industrial information processing / control equipment installation environment standards, by attaching the gas countermeasure device of the present invention to a sealed casing. In this standard, for corrosive gas, a state in which predetermined conditions (evaluation point ≦ 9) are satisfied, temperature and humidity are low, and no gas is detected is defined as an environmental class Class A. Therefore, it is possible to install the control device in an environment where it was impossible to install in the past.

  In addition, since the gas countermeasure device of the present invention employs a sirocco fan as a fan and can reduce the size of the device, it can be provided on a small freestanding board such as a stand type or a wall-mounted type. It is possible to take measures against corrosive gas.

  Note that the gas countermeasure device may be provided with a sensor for detecting the corrosive gas concentration in the housing so that an alarm is output when the gas concentration exceeds a threshold value. Thereby, it can be easily detected that the ability of the chemical adsorbent used in the adsorption unit to adsorb the corrosive gas is reduced, and management of the replacement time of the chemical adsorbent becomes unnecessary.

  In the above description, the example using the fine differential pressure sensor is shown, but instead of this, a pressure sensor for measuring the pressure in the housing may be used. In this case, the internal pressure may be set higher than the fluctuation range of the external pressure.

DESCRIPTION OF SYMBOLS 1, 31 ... Self-supporting closing board 2, 32, 72B ... Housing | casing 3A, 33A ... Front door 3B, 33B ... Rear door 4 ... Cooling device 4A ... Air cut valve 4B ... Drain pipe 5A-5D ... Bolt hole 6) Cable entry port 7 ... Outside air introduction port 8A, 8B, 38, 78 ... Electrical equipment housing 9, 50, 79 ... Gas countermeasure device (corrosive gas countermeasure device) 11A to 11E, 52, 82 ... Outside air Introduction pipe 12, 36, 51, 81 ... Dust filter 13 ... Outside air supply pipe 14, 53, 54, 84 ... Inside air introduction pipe 14A, 54A, 84A ... Inside air introduction port 15, 55, 85 ... Intake unit 15A, 55A, 85A ... Outside air ratio adjuster 15B, 55B, 85B ... Sirocco fan 15C, 85C ... Inside air inlet 16, 56, 86 ... Suction Unit 16A, 56A, 86A ... 1st adsorption part 16B, 56B, 86B ... 2nd adsorption part 17, 57, 87 ... Exhaust port 18, 58, 88 ... Abnormality detection part 18A, 58A, 88A ... Rotation detection sensor 18B, 58B , 88B ... fine differential pressure sensors 18C, 58C, 88C ... alarm unit 19 ... timed timer 20A ... first suction unit 20B ... second suction unit 21, 21A, 21B, 121A, 121B ... split lid 22, 122 ... notch DESCRIPTION OF SYMBOLS 23 ... Cable 24, 124 ... Caulking agent 41 ... Gas countermeasure unit 42 ... Case 43, 80 ... Outside air inlet 44, 45 ... Opening 47 ... Sealing sealing metal fitting 71 ... Monitoring console 72A ... Top plate 73A, 73B ... door

Claims (7)

A corrosive gas countermeasure device that is attached to a sealed housing that houses electrical equipment,
Suction means for sucking outside air outside the housing and inside air inside the housing, and mixing them to generate mixed air;
Adsorbing means for adsorbing corrosive gas through the mixed air and exhausting it into the housing;
Corrosive gas countermeasure device equipped with. An outside air introduction pipe connecting the outside air inlet for sucking outside air outside the housing and the suction means;
An inside air introduction pipe which is provided at a position away from the suction means by a predetermined distance and connects the inside air introduction port for sucking inside air in the housing and the suction means;
The corrosive gas countermeasure device according to claim 1, comprising: The suction means is attached to the opening provided in the casing from the outside of the casing,
The suction means is attached to the opening from the inside of the housing,
The corrosive gas countermeasure device according to claim 1, further comprising an inside air introduction pipe that is connected to the suction unit and sucks inside air from the inside of the housing. Measuring means for measuring the pressure difference between the outside of the housing and the inside of the housing;
Monitoring means for detecting a stop of the suction means;
An alarm means for outputting an alarm when the pressure difference measured by the measuring means falls below a preset threshold value or when the monitoring means detects a stop of the adsorption means;
The corrosive gas countermeasure device according to any one of claims 1 to 3, further comprising:   The corrosive gas countermeasure device according to any one of claims 1 to 4, wherein the suction means includes a sirocco fan.   6. The corrosive gas countermeasure device according to claim 1, wherein the adsorption means includes a chemical adsorbent that replaces the adsorbed corrosive gas with another substance by a chemical reaction. A sealed housing that houses electrical equipment,
Corrosive gas countermeasure device according to any one of claims 1 to 6,
A cable entry port for drawing the cable from the outside,
With
The cable entry port is attached with a split lid in which a plurality of cutout portions having the same shape as the cable that covers the whole and is drawn from the outside are formed,
A hermetically sealed casing, wherein a caulking agent that fills a gap between the cable and the cutout portion is applied around the cable sandwiched between the cutout portions.

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