JP2011080715A - Outside air introducing device for preventing salt damage and outdoor structure including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outside air introducing device for preventing salt damage capable of preventing corrosion due to salt damage, etc., when outside air is introduced to the inside of an outdoor structure, and the outdoor structure including the same. <P>SOLUTION: The outside air introducing device includes outside air introducing passages 14(14-1, 14-2) equipped with an outside air introducing port 12 for introducing the outside air 11, a front-stage side corrosion sensor 13 installed near and inside the outside air introducing port 12, a first outside air introducing passage 14-1 and a second outside air introducing passage 14-2 diverging the introduced outside air 11 into at least two or more on the slip stream side of the corrosion sensor 13, first/second passage opening/closing valves 15-1, 15-2 which are passage opening/closing means provided for the respective first/second outside air introducing passages 14-1, 14-2 for freely opening/closing the passages, a salt removing filter 16 installed inside the second outside air introducing passage 14-2, and a supply passage 17 which gathers the diverging first/second outside air introducing passages 14-1, 14-2 for supplying the outside air 11 to the inside of the outdoor structure 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a salt damage-preventing outside air introduction device capable of preventing corrosion due to salt damage or the like when outside air is introduced into an outdoor structure, and an outdoor structure including the same.

For example, if you have a large heating element such as a transformer inside an outdoor structure installed at sea or near the coast, introduce external air from the outside and stir the inside with a fan etc. Cooling is performed using a cooling device.
At this time, in the case where outside air accompanied by salt is taken in from the outside, there is a concern that a transformer, a control panel, and the like provided inside are corroded by salt damage.

  Currently, in the event of a typhoon or storm, in order to prevent salt damage accompanying from the outside, the outside air introduction part is closed and the inside is actively cooled using a cooling device installed inside. is the current situation.

There is also a proposal to install a filter for removing salt in the outside air introduction passage to remove salt accompanying the outside air.
As the salt removal filter for removing salt damage, for example, a filter material obtained by laminating glass fiber nonwoven fabrics having different densities (Patent Document 1), or a non-woven fabric having different densities made of water-repellent fibers may be laminated. (Patent Document 2) has been proposed.

Japanese Utility Model Publication No. 3-12332 Japanese Utility Model Publication No. 1-122824

  When using the said salt removal filter, since the lifetime of the filter is short, it needs to replace | exchange frequently, There exists a problem that the effort and expense increase.

  For this reason, in order to remove salt when taking outside air into the outside structure, conventionally, an outside air introduction gallery has been provided to make it difficult for salt in outside air to enter directly into the outside structure. However, since it does not prevent the salt content in the outside air from entering the inside of the outdoor structure, continued introduction of the outside air over a long period of time will cause the accumulation of salt in the outdoor structure, which may cause corrosion. Therefore, the countermeasure is desired.

  In view of the above problems, the present invention provides a salt damage-preventing outside air introduction device capable of preventing corrosion due to salt damage or the like when introducing outside air into an outdoor structure, and an outdoor structure including the same. And

  The first invention of the present invention for solving the above-described problems includes an outside air introduction passage having an outside air introduction port for introducing outside air, a front-stage corrosion sensor installed in the vicinity of the outside air introduction port, and the corrosion. On the downstream side of the sensor, the outside air to be introduced is divided into at least two outside air introduction passages, passage opening / closing means provided in each of the outside air introduction passages for opening and closing the passages, and the second and later branches. A salt damage-preventing outside air introduction comprising: a salt removal filter installed inside each outside air introduction passage, and a supply passage that collects branched outside air introduction passages and supplies outside air to the inside of the outdoor structure. In the device.

  According to a second aspect of the present invention, the outside air to be introduced is branched into at least two or more at the downstream side of the outside air introduction port that introduces outside air, the upstream side corrosion sensor installed near the outside air introduction port, and the downstream side of the upstream side corrosion sensor. An outside air introduction passage, passage opening / closing means provided in each of the outside air introduction passages, a salt filter installed in each of the second and subsequent outside air introduction passages, and a branched outside air introduction passage are assembled to collect outside air 11. A supply passage for supplying the interior of the outdoor structure, a downstream corrosion sensor installed on the downstream side of the salt filter installed in the outside air introduction passage, and a branched outside air introduction passage are assembled to collect outside air. A salt damage-preventing outside air introduction device comprising a supply passage for supplying the interior of an outdoor structure.

  According to a third aspect of the present invention, in the second aspect of the invention, there is provided a salt damage-preventing outside air introduction device having a cleaning means for cleaning the salt removal filter.

  According to a fourth aspect of the present invention, in the third aspect of the invention, there is provided a salt damage-preventing outside air introduction device that supplies residual heat air of a circulation fan that circulates air inside the outdoor structure to a salt removal filter after washing.

  According to a fifth aspect of the present invention, there is provided the salt damage prevention outside air introduction device according to any one of the first to fourth aspects, wherein two or more of the salt removal filters are provided in series in each outside air introduction passage.

  A sixth aspect of the present invention is the salt damage prevention outside air introduction device according to any one of the first to fifth aspects, wherein a hygrometer is provided in the vicinity of the front side corrosion sensor.

  A seventh aspect of the invention is an outdoor structure characterized in that any one of the first to sixth salt damage prevention outside air introduction devices is provided in an air introduction portion of the outdoor structure.

  ADVANTAGE OF THE INVENTION According to this invention, in the case of the introduction | transduction of the external air to the inside of an outdoor structure, while preventing the salt damage which is a corrosive factor, it can prevent for a long period of time.

FIG. 1 is a schematic diagram of a salt damage prevention outside air introduction device according to a first embodiment. FIG. 2 is a schematic diagram of another salt damage prevention outside air introduction device according to the first embodiment. FIG. 3A is a schematic diagram of the salt damage prevention outside air introduction device according to the second embodiment. FIG. 3-2 is a schematic diagram of another salt damage prevention outside air introduction device according to the second embodiment. FIG. 3-3 is a schematic diagram of another salt damage prevention outside air introduction device according to the second embodiment. FIG. 4-1 is a schematic diagram of the salt damage prevention outside air introduction device according to the third embodiment. FIG. 4-2 is a schematic diagram of another salt damage prevention outside air introduction device according to the third embodiment. FIG. 5 is a schematic view of a salt damage prevention outside air introduction device according to the fourth embodiment. FIG. 6 is a plan view of the corrosion sensor according to the present embodiment. FIG. 7-1 is a schematic diagram of a corrosion sensor. FIG. 7-2 is a schematic diagram of the corrosion sensor during corrosion measurement. FIG. 8 is a flowchart of the switching operation. FIG. 9 is a diagram showing the relationship between the relative humidity and the corrosion current value.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  A salt damage prevention outside air introduction device and an outdoor structure including the same according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a salt damage prevention outside air introduction device according to the present embodiment. As shown in FIG. 1, the salt damage-preventing outside air introduction device 10 </ b> A according to the present embodiment includes an outside air introduction passage 14 (14-1, 14-2) having an outside air introduction port 12 for introducing outside air 11, and the outside air introduction. The first-stage corrosion sensor 13 installed in the vicinity of the mouth 12 and the first outside air branched into at least two or more (two in this embodiment) outside air 11 to be introduced on the downstream side of the corrosion sensor 13. A passage opening / closing means that is provided in each of the introduction passage 14-1, the second outside air introduction passage 14-2, and the first and second outside air introduction passages 14-1, 14-2, and allows the passage to be opened and closed. The first valve 15-1, the second valve 15-2, the salt removal filter 16 installed in the second outside air introduction passage 14-2, and the branched first and second outside air introduction passages 14-1 and 14-2 are gathered, and the outside air 11 The heating element is for and a supply passage 17 for supplying the inside of the omitted) 20 and the like. In FIG. 1, reference numeral 19 denotes a hygrometer, 21 denotes a circulation fan, and 22 denotes a control device.

  In this embodiment, as the corrosion sensor 13, if two dissimilar metals (substrate and conductive part) are insulated from each other by an insulating part and both ends are exposed to the measured environment, Since a water film is connected between the two metals, a corrosion current flows, and this current corresponds to the corrosion rate of the base metal. Therefore, this current is measured by the ammeter 13a to measure the degree of corrosion.

The corrosion sensor 13 is generally called “Atmospheric Corrosion Monitor” or ACM type corrosion sensor (see Japanese Patent Application Laid-Open No. 2008-157647). An example of this sensor is shown in FIGS. 6, 7-1 and 7-2. As shown in FIG. 6 and FIG. 7A, the ACM type corrosion sensor (hereinafter referred to as “corrosion sensor”) 13 cuts a carbon steel plate having a thickness of 0.8 mm into 64 mm × 64 mm and forms a substrate 41. On the substrate 41, an insulating portion 42 of an insulating paste (thickness 30 to 35 μm) is applied and cured using a thick film IC precision screen printer.
Subsequently, a conductive paste (thickness 30 to 40 μm, filler: Ag) is laminated and printed on the pattern of the insulating portion 42 so as to maintain the greenness with the substrate 41, and cured to form the conductive portion 43. The corrosion sensor 13 is configured (see http://www.nims.go.jp/mdss/corrosion/ACM/ACM1.htm).
Here, the substrate 41 is a first conductive portion, and the conductive portion 43 is a striped second conductive portion.

Then, as shown in FIG. 7-2, the conductive portion 43 and the substrate 41 are short-circuited by the water film 44 such as humidity or sea salt (chloride ions or the like), and the Fe-Ag galvanic pair resulting from this is short-circuited. Corrosion current is measured with an ammeter 45. In FIG. 6, reference numerals 46a and 46b denote terminals.
Here, as said corrosion sensor 13, "ACM data logger" (brand name: Shrinks Co., Ltd.) etc. can be illustrated, for example.

The salt removal filter 16 in the present embodiment is capable of capturing sea salt particles. For example, on the first layer of the base material layer, the second layer of the salt absorption layer, and further the third layer having water repellency. Examples of the structure include low pressure and low loss.
Here, examples of the salt removal filter 16 include “salt damage filter” (trade name: Japan Eco Filter Co., Ltd.).

In this embodiment, a hygrometer 19 is installed in the vicinity of the corrosion sensor 13, and the amount of sea salt attached according to the humidity is measured.
Here, FIG. 8 shows the relationship between the relative humidity and the corrosion current value. In FIG. 8, a predetermined amount of sea salt is attached in advance, and the relationship between the sensor output (current value: I ₁ ) of the corrosion sensor 13 and the humidity at each sea salt attachment amount measured in a thermostatic bath, The sea salt adhesion amount can be estimated by measuring the current with the corrosion sensor 13 and measuring the humidity with the hygrometer 19 (Materials and Environment “Environmental Corrosion Evaluation by ACM Sensor” 54, 375-8 (2005 )reference).

  In this embodiment, the salt damage prevention outside air introduction device 10A is provided in the outside air introduction portion of the outdoor structure 20, and the seawater adhesion amount obtained from the measured current (I) by the corrosion sensor 13 is the adhesion sea per unit time. When it is confirmed that the increase in the amount of salt exceeds the threshold value, it is determined that the outside air containing high salt is introduced, and the first salt removal filter 16 that has introduced the ordinary outside air 11 is not installed. The control device 22 performs control to switch the flow path from the outside air introduction passage 14-1 to the second outside air introduction passage 14-2 in which the salt removal filter 16 is installed.

The unit time is in the range of 5 to 1000 minutes, preferably 15 to 45 minutes. The threshold is in the range of 5 to 100 mg / m ^2, the range of 8-12 mg / m ² are preferred.

After confirming that the increase in the amount of attached sea salt per unit time exceeds the threshold by the corrosion sensor 13, the control device 22 opens the passage opening / closing valve 15-2 of the second outside air introduction passage 14-2, and In addition, the passage opening / closing valve 15-1 of the first outside air introduction passage 14-1 is closed.
Here, although the valve is illustrated as the passage opening / closing means in the present embodiment, the present invention is not limited to this, and for example, a gate installed in a gate valve or a vent can be used. .

  Further, in this embodiment, the outside air introduction passage has two systems, but the present invention is not limited to this, and the second outside air is branched into three or more systems and has the second and subsequent salt removal filters 16. A plurality of introduction passages 14-2 may be provided to introduce outside air into the outdoor structure.

  As a result, since the salt damage that is a corrosive factor can be suppressed when the outside air 11 is introduced into the outdoor structure 20, the internal corrosion of the outdoor structure 20 is suppressed over a long period of time. be able to.

In the present embodiment, the salinity concentration is obtained by increasing the amount of attached sea salt per unit time using the corrosion sensor 13, but the present invention is not limited to this, for example, laser induced breakdown spectroscopy. An ion chromatographic method or the like can be used.
The laser induced breakdown spectroscopy measures the salinity concentration by measuring the Na ⁺ concentration in the atmosphere.
In addition, the corrosion sensor can continuously measure the attached sea salt with a simple configuration, and the corrosion sensor calculates the amount of change in the amount of sea salt attached per unit time (for example, minutes, hours). Can be used properly.

Further, like the other salt damage prevention outside air introduction device 10B of this embodiment shown in FIG. 2, a cooling device 23 is interposed in the supply passage 17 for supplying the outside air 11 to the inside of the outdoor structure 20. Good. Reference numeral 27 denotes a bypass passage, 15-3 denotes a third passage opening / closing valve, and 15-4 denotes a fourth passage opening / closing valve.
In this embodiment, when the corrosion current from the corrosion sensor 13 exceeds a predetermined value, it is determined that water containing sea salt has flown, and the first to third valves 15-1 to 15-3 are closed. The introduction of outside air is stopped, and the inside of the outdoor structure 20 is forcibly circulated and cooled by using the bypass passage 27 and the cooling device 23.
Such a case means, for example, a case where damage caused by salt damage such as typhoon or storm is large, and is effective for countermeasures against salt damage.

Here, the process performed about the switching of external air introduction of this invention is demonstrated, referring the flowchart of FIG.
Step 1) First, in the first step, the corrosion current (I) from the corrosion sensor 13 is measured to determine whether or not the corrosion current is a specified value (a) (S1). Here, the default value (a) in step 1) is preferably about 1 μA.
If “a ≦ current measurement value (I)” is determined as a result of the determination in the step 1), it is assumed that it is raining, and the introduction of the outside air 11 is stopped, and the inside of the outdoor structure 20 is switched to internal circulation air cooling. (S2). That is, internal circulation is performed by the circulation fan 21, the cooling device 23, and the bypass passage 27 in the outdoor structure 20. Then, returning to step 1), the corrosion current is continuously measured.

Step 2) In the second step, as a result of the determination in the above step 1), the sea salt adhesion amount is calculated from the corrosion current (I) of the sensor when “current value measurement value (I) <a”, and the unit It is determined whether or not the increase amount (s) of the sea salt adhesion amount per time is the threshold value (b) (S3). Here, the threshold value (b) in step 2) is preferably about 10 mg / h.

Step 3) In the third step, when “threshold value (s) <b” is determined as a result of the determination in the second step, the first valve 15-1 is opened and the outside air is passed through the first passage 14-1. Is directly introduced into the outdoor structure 20. On the other hand, in the second passage 14-2, the second valve 15-2 is closed to stop the introduction of the outside air to the salt removal filter 16 interposed in the second passage 14-2. (S4).
As a result, when the sea salt is low, the salt removal filter 16 is not allowed to pass through, so that the filter is less damaged, and as a result, the life of the salt removal filter can be increased.

Step 4) In the fourth step, when “threshold (s) ≧ b”, the amount of sea salt accompanying the outside air is large, so the valve 15-2 is opened and the second passage 14-2 is opened. The outside air desalted by the desalting filter 16 is introduced into the outdoor structure 20 (S5). At this time, the first valve 15-1 is closed to stop the introduction of outside air from the first passage 14-1.

  In the present embodiment, the salt damage prevention outside air introduction devices 10A and 10B are installed outside the outdoor structure 20, but the present invention is not limited to this, and is installed inside the outdoor structure 20. May be.

A salt damage prevention outside air introduction device and an outdoor structure including the same according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3A is a schematic diagram of the salt damage prevention outside air introduction device according to the present embodiment. As shown in FIG. 3A, the salt damage prevention outside air introduction device 10 </ b> C- 1 according to this embodiment includes an outside air introduction port 12 that introduces outside air 11, and a front-stage corrosion sensor 13 </ b> A that is installed near the outside air introduction port 12. A first and second outside air introduction passages 14-1 and 14-2 for branching the outside air 11 to be introduced into at least two or more (two in this embodiment) on the downstream side of the front stage corrosion sensor 13A; The open / close valves 15-1 and 15-2 provided in the outside air introduction passages 14-1 and 14-2, respectively, and the salt removal filter 16 installed inside the second outside air introduction passage 14-2 are branched. The first and second outside air introduction paths 14-1 and 14-2 are gathered to supply the outside air 11 into the outdoor structure 20 and the second outside air introduction path 14-2. After being installed on the downstream side of the installed salt removal filter 16 Those comprising a side corrosion sensor 13B, the.
A front-side hygrometer 19A is provided in the vicinity of the front-stage corrosion sensor 13A, and a rear-stage hygrometer 19B is also installed in the vicinity of the rear-stage corrosion sensor 13B so as to detect the humidity of the outside air.

In this embodiment, before the salt removal filter 16 reaches the end of its service life, its life is detected in advance by the latter-stage corrosion sensor 13B.
In other words, when it is confirmed by the rear-stage corrosion sensor 13B that the corrosion current has reached a predetermined value or more, the controller 22 informs that the deterioration of the salt removal filter 16 is approaching, and the predetermined countermeasure (replacement) Or cleaning etc.).

When it is detected that the salt removal filter 16 has been deteriorated by the latter-stage corrosion sensor 13B, a cleaning means 31 as shown in FIG. 3-2 is used when cleaning measures are taken.
As shown in FIG. 3-2, in the salt damage prevention outside air introduction device 10 </ b> C- 2, a cleaning unit 31 that cleans the surface of the salt removal filter 16 with the cleaning water 30 is installed, and the cleaning water 30 is supplied to the salt removal filter 16. The salt is washed away by spraying. The drain water 30a is separately discharged to the outside.

  In that case, you may make it utilize for the drying after washing | cleaning of the salt removal filter 16 using the remaining heat air 24 of the circulation fan 21 which circulates the internal air of the outdoor structure 20. FIG. The residual heat air 24 is supplied through a residual heat air supply passage 26 provided with a valve 25.

Here, since the first stage corrosion sensor 13A is installed in the vicinity of the entrance, depending on the exposure environment, it is likely to be subject to corrosion degradation.
For this reason, the degree of deterioration of the corrosion sensor 13A is monitored by, for example, a color analyzer or a color difference meter, and measures are taken.

In addition, when the amount of sea salt attached is large (for example, 500 to 1000 mg / m ² ), it is necessary to consider the influence of sea salt loss.

FIG. 9 is a relationship diagram between the passage of time and the amount of sea salt attached. According to FIG. 9, the amount of sea salt adhering to the corrosion sensor 13 tends to increase with the passage of time, and when a certain amount of adhesion is exceeded, the sea salt is attached and removed alternately, for example, 1000 mg. It is confirmed that it is almost flat as it approaches / m ² .
Therefore, a predetermined threshold value (for example, 200 to 500 g / m ² ) is set for the sea salt adhesion amount, and when the sea salt adhesion amount exceeding the predetermined threshold value is detected, the surface of the corrosion sensor 13 is cleaned or replaced. Like to do.

  In FIG. 3C, a cleaning means 32 for cleaning the surface of the corrosion sensor 13 with the cleaning water 30 is provided. When the predetermined threshold value is reached, the surface of the corrosion sensor 13 is cleaned with the cleaning water 30, regenerated, and reused. It is intended to extend the life of the salt removal filter by using it.

A salt damage prevention outside air introduction device and an outdoor structure including the same according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4A is a schematic diagram of the salt damage prevention outside air introduction device according to the present embodiment. As shown in FIG. 4A, the salt damage prevention outside air introduction device 10D-1 according to the present embodiment is the same as the salt damage prevention outside air introduction device 10C-2 of the second embodiment. Two salt removal filters 16A and 16B are provided in series (two in this embodiment).
In addition, in the vicinity of each of the salt removal filters 16A and 16B, the remaining heat air 24 of the circulation fan 21 is supplied by the remaining heat air supply passage 26 including the first valve 25-1 and the second valve 25-2. I have to.

  In addition, in order to drop off the salt content dried by the preheated air 24 efficiently, a vibration means (not shown) that vibrates the filter portions of the salt removal filters 16A and 16B may be provided so as to actively drop off.

  Further, as shown in FIG. 4B, a bypass passage 33 that bypasses the front-stage salt removal filter 16A is provided, and even if the pressure loss of the salt-removal filter 16A increases, the salt removal function is performed by the rear-stage salt removal filter 16B. May be allowed to continue and the introduction of outside air may be continued.

A salt damage prevention outside air introduction device and an outdoor structure including the same according to an embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a schematic view of the salt damage prevention outside air introduction device according to the present embodiment. As shown in FIG. 5, the salt damage-preventing outside air introduction device 10E according to this embodiment includes a second outside air introduction passage 14-2 having a salt removal filter 16 in the salt damage prevention outside air introduction device 10C-1 according to the second embodiment. Further, a plurality (three in the present embodiment) are provided.
In the present embodiment, the supply passage 17 to the outdoor structure is provided with a cooling device 23 for cooling the inside.

  When the salt removal filter 16 of the second outside air introduction passage 14-2 deteriorates, the third outside air introduction passage 14-3 and the fourth outside air introduction passage 14-4 are switched in order, for a long time. In this way, the introduction of the outside air 11 is continued.

  As described above, by using the salt damage-preventing outside air introduction device of the present invention, it is possible to significantly suppress the conventional corrosion caused by salt damage accompanying the introduction of outside air into the outdoor structure. Examples of such an outdoor structure include a bridge facility, a solar cell facility, a wind power generation device, a power generation plant facility, a reinforcing bar building, a railroad facility, and the like that require countermeasures against salt damage on the coast or the like.

  As described above, the salt damage prevention outside air introduction apparatus according to the present invention switches to salt damage prevention measures while monitoring the corrosion state when introducing outside air that cools the inside of an outdoor structure. When introducing outside air into the structure, it is possible to suppress salt damage, which is a corrosive factor, and to prevent the damage over a long period of time.

10A, 10B, 10C-1, 10C-2, 10D-1, 10D-2, 10E Salt damage prevention outside air introduction device 11 Outside air 12 Outside air introduction port 13 Corrosion sensor 14 Outside air introduction passage 14-1 First outside air introduction passage 14- 2 Second outside air introduction passage 15-1 First passage opening / closing valve 15-2 Second passage opening / closing valve 16 Desalination filter 17 Supply passage 20 Outdoor structure 21 Circulation fan

Claims (7)

An outside air introduction passage having an outside air introduction port for introducing outside air;
A pre-stage corrosion sensor installed in the vicinity of the outside air inlet;
On the downstream side of the corrosion sensor, an outside air introduction passage that branches outside air to be introduced into at least two or more,
A passage opening / closing means provided in each of the outside air introduction passages to freely open and close the passage;
A salt removal filter installed in each of the outside air introduction passages branched after the second,
A salt damage-preventing outside air introduction apparatus comprising: a supply passage for collecting branched outside air introduction paths and supplying outside air to the inside of an outdoor structure. An outside air introduction port for introducing outside air;
A front-side corrosion sensor installed near the outside air inlet,
An outside air introduction passage for branching outside air to be introduced into at least two or more on the downstream side of the front side corrosion sensor;
Passage opening / closing means provided in each of the outside air introduction passages;
A salt removal filter installed in each of the second and subsequent outside air introduction passages;
A supply passage for collecting the branched outside air introduction paths and supplying the outside air to the interior of the outdoor structure;
A rear-stage corrosion sensor installed on the downstream side of the salt removal filter installed in the outside air introduction passage;
A salt damage-preventing outside air introduction apparatus comprising: a supply passage for collecting branched outside air introduction paths and supplying outside air to the inside of an outdoor structure. In claim 2,
A salt damage-preventing outside air introducing device comprising a cleaning means for cleaning the salt removal filter. In claim 3,
A salt damage-preventing outside air introduction device that supplies residual heat air of a circulation fan that circulates air inside the outdoor structure to a salt removal filter after washing. In any one of Claims 1 thru | or 4,
2. A salt damage-preventing outside air introduction device, wherein two or more salt removal filters are provided in series in each outside air introduction passage. In any one of Claims 1 thru | or 5,
A salt damage-preventing outside air introducing device, comprising a hygrometer in the vicinity of the front-stage corrosion sensor.   An outdoor structure, wherein the salt damage-preventing outside air introduction device according to any one of claims 1 to 6 is provided in an air introduction part of the outdoor structure.

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