JP2003229679A - Enclosure device for outdoor installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an enclosure device for outdoor installation having an internal pressure adjusting function for adjusting the difference between the internal pressure and an external pressure of an enclosure. <P>SOLUTION: This enclosure device for outdoor installation is provided with a pressure adjusting section 21 which adjusts the difference between the internal pressure and the external pressure of the enclosure 1. The section 21 has, for example, a bag body 13 which has a blowhole 13b for intake air and exhaust air communicating with the atmosphere, closely partitions the inside of the enclosure 1 from the outside, and is formed in a bag-like shape by using a flexible material. When the internal pressure of the enclosure 1 becomes a negative pressure, the bag body 13 is crushed flat by exhausting inside air to the outside through the blowhole 13b. When the internal pressure of the enclosure 1 becomes a positive pressure, the bag body 13 expands by sucking the outside air through the blowhole 13b. Therefore, the difference between the internal pressure and the external pressure of the enclosure 1 can be adjusted through the variation in configuration of the bag body 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing device for outdoor installation which houses an electric circuit section on a road traffic system and is installed outdoors.

[0002]

2. Description of the Related Art FIGS. 14 and 15 show an example of the arrangement of an outdoor installation housing that houses the electric circuit portion of a conventional road traffic system and is installed outdoors. FIG. 14 is a vertical cross-sectional side view thereof, and FIG. 15 is a sectional view taken along the line DD of FIG. In FIGS. 14 and 15, the outdoor installation casing 101 is a pedestal 102.
Is installed on the road 103 via. Case 1 for outdoor installation
An outdoor pull box 104 embedded in a road 103 is installed below the pedestal 102 on which 01 is placed. An electronic device unit 105 is installed inside the outdoor installation casing 101, and a cable (underground electrical piping) is provided between the electronic device unit 105 and a traffic management center (not shown).
106 and the like. The cable 106 is buried in the ground, and is guided to the traffic management center via the outdoor pull box 104, the relay box 107, etc. in the ground.

The outdoor installation case 101 is opened at the front surface for inspecting the internal electronic equipment unit 105, and an openable / closable door 108 is provided in the opening, and the opening is usually closed by the door 108. Inside the door 108, a rainproof and dustproof rubber packing 109 is attached over the entire circumference, and when the door 108 is closed, the rubber packing 109 is elastically compressed with the outdoor installation casing 101. In the state, it is tightly closed and prevents rainwater and dust from entering. A cable lead hole 111 is provided on the bottom surface 101a of the outdoor installation case 101 into which the cable 106 is drawn. The cable 106 passes through the cable lead hole 111 and then penetrates the sealing bottom plate 110. And extends into the outdoor installation case 103 and is connected to the electronic device unit 105. It should be noted that the outdoor installation 1
In 01, caulking 112 is performed on the sealing bottom plate 110 so as to fill the gap between the cable 106 and the sealing bottom plate 110 and the gap between the sealing bottom plate 110 and the outdoor installation case 101. The structure is such that water and water vapor (humidity) are prevented from entering from the bottom surface 101a side.

[0004]

However, since the outdoor-installation housing 101 thus installed outdoors is used in a variety of severe environments throughout the year, the conventional structure has the door 108 as described above. A dustproof rubber packing 109 is provided between the housing 101 and the outdoor installation casing 101 for the purpose of waterproofing and preventing dust contained in exhaust gas and the like, and the bottom plate 101a is provided with a sealing bottom plate 110, caulking 112, etc. It has a waterproof and dustproof structure.

However, in the outdoor installation case 101 which is installed outdoors, dew condensation occurs in the case due to a rapid temperature change due to a change in weather, and since the case has a hermeticity, the internal pressure is reduced and the external environment is reduced. May inhale more water. For example, the internal temperature of the outdoor installation casing 101 that receives direct sunlight on the surface in summer may exceed 60 ° C.,
When the outside of the housing is rapidly cooled due to rainfall here, the temperature inside the housing also drops sharply, the air inside the housing contracts due to the decrease in the internal temperature, and the internal air pressure that has a hermeticity is higher than the outside air pressure. Also decreases, and the internal pressure becomes negative pressure. Due to the generation of this negative pressure, it stays in the outdoor pull box 104 and the relay box 107 used for the cable 106 on the bottom surface 101a of the outdoor installation case 101 from the pinholes and cracks existing in the infiltration / encapsulation site of the field construction. The rainwater and water vapor (humidity) that have been used are sucked into the outdoor installation casing 101. Due to this moisture or the moisture condensed inside the casing, the casing for outdoor installation 101
There is a problem of salt damage and sulfur damage that causes rust on the inner surface of the device, the metal surface of the electronic device unit 105, and the terminal portion. Moreover,
There is a problem that the sucked rainwater floods the electronic device unit 105 installed inside the outdoor installation casing 101 and causes a malfunction.

The present invention has been made to solve such a problem, and provides an enclosure device for outdoor installation which regulates the internal pressure of the enclosure and prevents the suction of water in the enclosure. .

[0007]

According to another aspect of the present invention, there is provided an outdoor installation casing device, wherein a pressure adjusting portion for adjusting a pressure inside the casing has a bag body having a portion communicating with the outside of the casing. The configuration is such that a difference in pressure between the inside and the outside of the housing is adjusted by changing the shape of the bag body. With this configuration, the difference in the pressure inside the housing and the pressure outside the housing is adjusted to be approximately equal by changing the shape of the bag, and this equalization prevents the inhalation of accumulated rainwater and moisture (water vapor). In addition, salt damage and sulfur damage can be prevented.

Further, the outdoor casing device of the present invention includes a pressure adjusting unit for sending gas into the casing, a pressure detecting unit for detecting a pressure difference between the inside and outside of the casing, and the pressure detecting unit. And a pressure control means in the housing for controlling the pressure adjustment of the pressure adjusting section according to the detection result of the section. With this configuration, the pressure inside the housing is adjusted to be equal to or more than the pressure outside the housing by adjusting the pressure of the pressure adjustment unit, and this adjustment prevents the inhalation of accumulated rainwater and moisture (water vapor). Will be possible.

Further, the outdoor installation casing device of the present invention has a structure in which an air filter is provided at the outside air intake of the pressure adjusting portion for adjusting the pressure inside the casing. According to this configuration, the outside air taken into the air compressor can be purified by the air filter, and the clean outside air after purification can be compressed and sent into the housing, so that the inside of the compressor and the housing is always kept clean. You can keep it.

Further, the outdoor enclosure device of the present invention is provided with an elastic balloon that expands and contracts due to the pressure difference between the inside of the housing and the outside air, and confirms the pressure inside the housing from the expansion and contraction. It has a configuration. With this configuration, the rubber balloon is always inflated to a certain size, and the air pressure inside the housing can be easily known from the size.

Further, in the outdoor installation casing device of the present invention, the pressure adjusting portion is provided with alarm means for issuing an alarm when the pressure inside the casing becomes lower than a set value. . According to this configuration, when the pressure inside the housing falls below the set value and the negative pressure becomes an abnormal state, it is notified, so that it is possible to easily recognize the abnormality inside the housing by knowing the alarm. Becomes

Further, the housing apparatus for outdoor installation of the present invention is provided with a timed timer means for issuing an alarm after a lapse of a fixed time after it is judged that the pressure inside the housing becomes lower than a set value. have. According to this configuration, the alarm is issued after a certain period of time when the abnormality is determined.
Therefore, if the abnormality disappears within a fixed time, the alarm is canceled, so that the alarm is not issued when the abnormality occurs instantaneously. As a result, the alarm is not issued when an abnormality that immediately returns to the normal state occurs, so that it is possible to solve the problem that the alarm is issued even for some abnormality.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, a housing device for outdoor installation according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show the configuration of a road traffic system to which the housing device for outdoor installation according to the first embodiment is applied. 1 is a layout configuration diagram thereof, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and 2, in the road traffic system according to the first embodiment, the outdoor installation case 1 is installed on the road 3 via the pedestal 2. Below the pedestal 2 on which the outdoor installation case 1 is placed, an outdoor pull box 4 embedded in the road 3 is installed. An electronic device unit 5 is provided inside the outdoor installation case 1.
Is installed, and a cable (underground electrical piping) 6 is installed between the electronic device unit 5 and a traffic control center (not shown).
And the like. The cable 6 is buried in the ground, and is guided to the traffic management center via the outdoor pull box 4 and the relay box 7 in the ground.

The outdoor installation case 1 is in the form of a hexahedron box, and the front surface is opened for inspection of the internal electronic equipment unit 5. A door 8 that can be opened and closed is provided at the opening, and the door 8 is normally closed. Further, a rubber packing 9 for rainproof and dustproof is attached to the inside of the door 8 over the entire circumference thereof, and when the door 8 is closed, the rubber packing 9 is elastically compressed between the housing 1 for outdoor installation. In the closed state, it is tightly closed to prevent rainwater and dust from entering. A cable lead hole 11 is provided on the bottom surface 1a of the outdoor installation housing 1 into which the cable 6 is drawn,
After passing through the cable lead hole 11, the cable 6 penetrates the sealing bottom plate 10 and extends into the outdoor installation casing 1,
It is in a state of being connected to the electronic device unit 5. In the outdoor installation case 1, on the sealing bottom plate 10, the gap between the cable 6 and the sealing bottom plate 10 and the gap between the sealing bottom plate 10 and the outdoor installation case 1 are filled. Then, caulking 12 is applied to the structure to prevent water or water vapor (humidity) from entering from the bottom surface 1a side.

Further, inside the outdoor installation case 1, a bracket 14 is provided between the electronic equipment unit 5 and the back surface 1b.
A bag body 13 as a pressure adjusting means is attached via. As shown in the perspective view of FIG. 3, the bag body 13 is made of a flexible material such as rubber or vinyl.
3a and a pipe portion 13c having an air hole 13b for intake and exhaust of outside air in the bag portion 13a. The bag body 13 is attached in a state where the bag body 13 is projected to the outside through a pipe portion 13c into a pipe take-out hole 15 formed in the back surface 1b of the outdoor installation case 1 and the air hole 13b is opened to the outside air. Further, when attached, only for the first time, the amount of air based on the internal temperature of the housing is supplied from the air hole 13b in the bag portion 13a to the display window 17 provided on the one side surface 1c of the outdoor installation housing 1. Blow only the amount according to the index 18, the pressure in the outdoor installation casing 1 and the bag portion 13a.
It is placed in a state in which the internal pressure is equalized. A sealing material (not shown) is attached between the pipe portion 13c and the pipe take-out hole 15 to maintain an airtight state. Further, in the outdoor installation case 1, the air hole 1 of the pipe portion 13c is provided outside the rear surface 1b from which the pipe portion 13c is taken out.
Cover 1 for preventing rainwater and the like from blowing into 3b
6 is installed. In addition, a filter is provided at the opening of the air hole 13b of the bag body 13, and when the inhaled air passes through the filter, dust contained in the air is absorbed by the filter and separated to obtain clean air. You may make it take only in the bag part 13a.

In the outdoor installation casing device of the first embodiment configured as described above, the outdoor installation casing 1 (hereinafter, simply referred to as "casing 1") by the pressure adjustment operation by the bag body 13.
That is, the internal pressure and the external atmospheric pressure are equalized, and the infiltration of rainwater and dust can be prevented by this equalization. The operation will be described below. When receiving direct sunlight in the summer, the inside of the housing 1 with the door 8 closed becomes hot,
The internal air expands. As a result, the inside of the casing 1 becomes positive pressure due to the increase of the air pressure. In this case, the bag body 13 inside the casing 1 discharges the air in the bag portion 13a to the outside through the air holes 13b and is crushed. The expansion of the air inside the housing 1 is absorbed by the crushing of the
The inside of the housing 1 is not made to have a positive pressure. In addition, if the outer surface of the outside of the casing 1 is rapidly cooled due to rainfall such as the evening sun in summer, the inside is also cooled. Due to this temperature change, the temperature inside the housing 1 also drops sharply, and the internal air contracts. As a result, the inside of the housing 1 becomes negative due to a decrease in air pressure. In this case, the bag body 13 inside the housing 1 absorbs the outside air through the air holes 13b and swells, thereby absorbing the contraction of the inside air and communicating with the outside air. The pressure inside the housing 1 is not made negative.

As described above, in the structure of the outdoor installation casing device according to the first embodiment of the present invention, the pressure adjustment operation by the bag body 13 causes the pressure inside and outside the casing 1 to be always equal. Since the outside air is prevented from being directly taken into the housing 1, it is possible to prevent suction of accumulated rainwater and humidity (water vapor), and at the same time prevent salt damage and sulfur damage.

(Second Embodiment) Next, an outdoor installation casing device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the configuration of a road traffic system to which the outdoor casing device according to the second embodiment is applied. In the configuration of the outdoor installation casing device according to the second embodiment, while the bag body 13 is used as the pressure adjusting means in the first embodiment shown in FIG. 1, the small air compressor 20 (hereinafter, referred to as Simply “Compressor 2
0 ”) and the like are provided in a state of being placed on the upper surface 1d of the housing 1, and other configurations are substantially the same as those in FIG. Therefore, the same members are denoted by the same reference numerals, and duplicate description will be omitted. The pressure adjusting unit 2
1 is stored in the unit body 23 together with the pressure display portion 22 and is installed on the upper surface 1 d of the housing 1. Unit body 2
As shown in FIG. 5, 3 is formed as a closed box that also serves as the top surface 1d of the housing 1 as a bottom surface, and is also provided with a partially openable / closable door (not shown).

In addition to the compressor 20, the pressure adjusting unit 21 includes an electric motor 24 for driving the compressor 20, a control unit 25, an internal pressure sensor 26I for detecting the pressure in the housing 1, and an external pressure sensor 26O. And the safety valve 27
And so on. The compressor 20 sends compressed air into the housing 1, and in the middle of the supply pipe 28, only the dry air from which moisture contained in the compressed air is removed is supplied to the housing 1.
Steam separator 29 and compressor 20 for feeding into
A check valve 30 is attached to prevent the air in the housing 1 from flowing back to the compressor 20 when the engine is stopped. The internal pressure sensor 26I determines the pressure inside the housing 1 to be the external atmospheric pressure P.
The external pressure sensor 26O is a sensor that outputs a signal to the control unit 25 in order to keep it at 0 or more.
It is a sensor for detecting P0. The control unit 25 is for controlling the pressure adjusting unit 21, and is formed of a microcomputer. The electric motor 24, the internal pressure sensor 26I, and the external pressure sensor 26O are connected to the control unit 25. Further, a door detection switch 31, which detects opening and closing of the door 8, an external alarm device 32, etc. are also connected. This is because no internal pressure is applied during inspection. An air intake window 39 with an air filter is provided in a part of the unit body 23, and a cover 40 for preventing rainwater and the like from spraying on the air intake window 39 is attached to the outside thereof. . Compressor 2
The outside air in the unit body 23 supplied to 0 is cleaned by an air filter when passing through the air intake window 39, and is taken in in a state where dust and the like are removed.

As shown in detail in FIGS. 6 and 7, the pressure display portion 22 is secured inside the display window 33 and the display window 33 which is covered with the transparent glass on the wall surface of the unit body 23. Partition chamber 34 and rubber balloon 3 arranged in the partition chamber 34
5 and a pointer 36 and the like. The rubber balloon 35
The air blowing port 35a is opened to the inside of the housing 1 by penetrating the hole 1e of the upper surface 1d so that the air in the housing 1 is blown into and expanded. Inner surface of hole 1e and rubber balloon 3
Airtightness is provided between the outer surface and the outer surface of 5. The rubber balloon 35 swells when the inside of the housing 1 has a positive pressure, and when the rubber balloon 35 swells, the rubber balloon 35 spreads upward in the partition chamber 34, and accordingly, the pointer 36 is pushed by the rubber balloon 35 to guide the partition chamber 34. It is guided by the hole 37 and moves upward. On the contrary, when the pressure in the housing 1 is reduced, the rubber balloon 35 is contracted, and the partition chamber 34
The inside contracts downward, and the pointer 36 moves downward accordingly. A scale is provided as an index 38 on the outside of the display window 33, and the pressure in the housing 1 can be known from the outside through the display window 33 by making the moving pointer 36 correspond to the index 38. it can.

FIG. 8 is a flow chart showing the operation of the pressure adjusting unit 21 in the second embodiment. The pressure adjusting operation will be described with the flowchart. First, the control unit 25 detects the pressure P1 in the housing 1 from the signals from the internal pressure sensor 26I and the external pressure sensor 26O, and the housing 1
The internal pressure P1 and the external pressure P0 are compared, and whether the difference is within the upper limit allowable value (+ α) or the lower limit allowable value (P0), that is, the condition of P0 (1 + α) ≧ P1 = P0 is satisfied. Is determined (step ST
1). When the condition of P0 (1 + α) ≧ P1 = P0 is satisfied, it is when the pressure equalization with the outside air P0 is achieved. In this case, the process proceeds to step ST5, the electric motor 24 is stopped (OFF), Compressor 20
Is stopped and the process proceeds to step ST1 again.

On the other hand, if the condition of P0 (1 + α) ≧ P1 = P0 is not satisfied, it means that the equalization with the outside air P0 is not achieved. In this case, the process proceeds to step ST2 and the internal pressure sensor 26I Therefore, it is determined whether the inside of the housing 1 has a negative pressure when P1 <P0 or has an overpressure when P1> P0 (1 + α). If it is in the overpressure state, the process proceeds to step ST5, the electric motor 24 is stopped (OFF), the compressor 20 is kept stopped, and the process proceeds to step ST1 again. When the inside of the casing 1 is equal to or higher than a predetermined pressure, that is, when the casing 1 is in an overpressure state, the safety valve 27 is temporarily opened to temporarily release the air in the casing 1 to reduce the pressure. On the other hand, if the negative pressure is present, step S
After shifting to T3, the electric motor 24 is driven (turned on), the compressor 20 is started to send compressed air into the housing 1, and the pressure P1 in the housing 1 is monitored, and P1> P0 (1 + α) is switched to. Whether or not it is monitored (step ST4). When P1> P0 (1 + α) is switched, the electric motor 24 is stopped (OFF)
Then, the compressor 20 is stopped. And it returns to step ST1 again and continues monitoring again. After the electric motor 24 is driven (turned on) and the compressor 20 is started, P1> P0 (1 + α) is not satisfied for t seconds (in this example, it is set to about 60 seconds) Step ST6-Step ST2-Step ST
3-The operation of step ST4 is repeated, and this is monitored by a time timer (not shown). Even if t seconds have elapsed, P1> P0
If the value does not become (1 + α), the process proceeds to step ST7 and the alarm device (alarm means) is turned on to generate an alarm.
The notification by this alarm can be sent to the traffic center for notification, or can be notified on the case 1 on the spot. This alarm continues until it is confirmed and reset by the operator, and when reset, the alarm by the alarm device is canceled and the alarm stops. And again step ST
The operation from 1 is repeated. Although not included in the flow chart, when the door open signal is ON, the electric motor 2
Stop 4 and avoid unnecessary pressurization.

Therefore, the following effects can be expected in the structure of the outdoor installation casing device according to the second embodiment. By the pressure adjusting operation by the pressure adjusting unit 21, the pressure inside the housing 1 is made equal to or higher than the external pressure so that the condition of P0 (1 + α) ≧ P1 = P0 is always satisfied, and the pressure is set. Thus, the outside air is prevented from being directly taken into the housing 1, so that it is possible to prevent suction of accumulated rainwater and moisture (water vapor), and at the same time, prevent salt damage and sulfur damage. Since the pressure display portion 22 including the rubber balloon 35 that is inflated by the pressure in the housing 1 and the pointer 36 and the index 38 is provided, the position of the pointer 36 that moves up and down due to the expansion and contraction of the rubber balloon 35 is used as the index 38. By associating with each other, the pressure in the housing 1 can be easily known. Since the outside air intake (air intake window 39) of the air compressor 20 is provided with an air filter, the outside air taken into the air compressor 20 is purified by the air filter, and the cleaned outside air is compressed to form a casing. 1 can be sent inside. This allows
The compressor 20 and the inside of the housing 1 can be kept clean at all times.・ Supply pipe 28 for feeding air with the air compressor 20
Since the steam separator 29 is provided in the middle of the above, only clean and dry air can be sent into the inside of the housing 1. When the pressure inside the housing 1 exceeds a set value, a safety valve 27 that releases the air inside the housing 1 to the outside to reduce the pressure is provided. If the pressure inside the housing 1 increases abnormally, the safety valve 27 is activated. Since the gas is released to the outside to reduce the pressure, an explosion accident or the like can be prevented in advance. Since the pressure adjusting unit 21 is provided with an alarm means (external alarm device 32) that determines that the pressure inside the housing 1 is abnormal when the pressure inside the housing 1 is lower than a set value (negative pressure) and notifies the abnormality,
By knowing the alarm, the abnormal negative pressure inside the housing can be easily recognized. Also, after being determined to be abnormal,
Since a time limit timer for issuing an alarm after a lapse of a certain period of time is provided so that the alarm is canceled when the abnormality disappears within the certain period of time, the alarm cannot be issued when an abnormality occurs momentarily. Therefore, no alarm is issued when the normal state is restored immediately, so that it is possible to solve the problem that the alarm is issued even if there is some abnormality. The time limit timer is provided in the control unit 25 or the external alarm device 32.

In the structure of the second embodiment, the structure in which the internal pressure sensor 26I and the external pressure sensor 26O are provided in the housing 1 is disclosed. However, as shown in FIG. 9 and FIG. In the portion 22, the upper limit detection switch 26h and the lower limit detection switch 26l are arranged within the moving range of the pointer 36 that moves up and down according to the expansion and contraction of the rubber balloon 35, and the pointer 36 crosses in front of the detection switch 26h or 26l. Sometimes, the pointer 36 is detected and the detection switch 2
A structure in which a signal is output from 6h or 26l may be used.

(Third Embodiment) Next, referring to FIG. 11 showing an outdoor installation casing device according to a third embodiment of the present invention.
Will be described with reference to. FIG. 11 shows the configuration of a road traffic system to which the housing device for outdoor installation according to the third embodiment is applied. In the configuration of the outdoor installation casing device according to the third embodiment, the compressor 20 is used as the pressure adjusting unit 21 as the pressure adjusting means in the second embodiment shown in FIGS. 4 and 5. Pressure tank 41
A pressure adjusting unit including the above is provided, and the other configurations are substantially the same as those in FIGS. 4 and 5. Therefore, the same members as those of the second embodiment shown in FIGS. 4 and 5 are designated by the same reference numerals, and the duplicated description will be omitted. The pressure adjusting unit 21 is housed in the unit body 23 together with the pressure display unit 22 and is installed on the upper surface 1d of the housing 1 as in the structure of the second embodiment. As shown in FIG. 12, the unit body 23 is formed as a sealed box that also serves as the bottom surface of the upper surface 1d of the housing 1, and is also provided with a partially openable door, which is not shown.

The pressure adjusting unit 21 will be described with reference to FIG. In the pressure adjusting unit 21, in addition to the pressure tank 41 in which gas such as nitrogen gas or dry air is compressed and stored, a solenoid valve 42 for controlling the supply of gas in the pressure tank 41, a control unit 25, and a casing. An internal pressure sensor 26I that detects the pressure inside the body 1, an external pressure sensor 26O that detects the pressure outside the housing 1, and a safety valve 27 are provided. The pressure tank 41 sends compressed gas into the housing 1,
The check valve 30 is also built in the supply pipe 28 to which the solenoid valve 42 is attached. The internal pressure sensor 26I is a sensor that outputs a signal to the control unit 25 in order to keep the pressure inside the housing 1 at the atmospheric pressure P0 or more, and the external pressure sensor 26O detects the pressure (outside atmospheric pressure) P0 outside the housing 1. Sensor. The control unit 25 is for controlling the pressure adjusting unit 21, and is formed of a microcomputer. The electric motor 24, the internal pressure sensor 26I, and the external pressure sensor 26O are connected to the control unit 25. Further, a door detection switch 31, which detects opening and closing of the door 8, an external alarm device 32, etc. are also connected. This is because no internal pressure is applied during inspection. Also in the internal pressure sensor 26I here, the pressure inside the housing 1 is higher than the outside air pressure P0 by (α1) (positive pressure).
Then, the external pressure sensor 26O is a sensor that turns on and outputs a signal to the control unit 25.
When it becomes lower than 0 by (α2) (negative pressure), it turns on and the control unit 2
5 is a sensor that outputs a signal. The pressure tank 4
1 and the unit body 23, a filling port 43 for replenishing the above-mentioned gas compressed in the pressure tank 41 from the outside of the unit body 23 is provided, and on the outside of the unit body 23, the filling port 43. A cover 40 is attached to prevent the rainwater and the like from being sprayed on. Further, the pressure display unit 22 having the same structure as the structure shown in FIGS. 6 and 7 is used.

FIG. 13 is a flow chart showing the operation of the pressure adjusting unit 21 in the third embodiment. The pressure adjusting operation in the third embodiment will be described together with the flowchart. Internal pressure sensor 26I and external pressure sensor 2
In response to a signal from 6O, the control unit 25 causes the pressure P in the housing 1 to reach P.
1 is detected and the pressure P1 in the housing 1 is compared with the outside air pressure P0, and the difference is the upper limit allowable value (+ α) or the lower limit allowable value (Pα).
0), that is, whether or not the condition of P0 (1 + α) ≧ P1 = P0 is satisfied (step ST
11). When the condition of P0 (1 + α) ≧ P1 = P0 is satisfied, the pressure equalization with the outside air P0 is achieved. In this case, the process proceeds to step ST15, and the control unit 25 closes the solenoid valve 42. Then, the process proceeds to step ST11 again. Therefore, at this time, the compressed gas in the pressure tank 41 is not supplied into the housing 1.

On the other hand, when the condition of P0 (1 + α) ≧ P1 = P0 is not satisfied, it means that the pressure equalization with the outside air P0 is not achieved. In this case, the process proceeds to step ST12 and the internal pressure sensor 26I Therefore, it is determined whether the inside of the housing 1 has a negative pressure when P1 <P0 or has an overpressure when P1> P0 (1 + α). If it is in the overpressure state, the process proceeds to step ST15, and the control unit 25 causes the solenoid valve 4
2 is left closed, and the process proceeds to step ST11 again. When the pressure inside the housing 1 is equal to or higher than a predetermined pressure, that is, in the overpressure state, the safety valve 27 is temporarily opened to temporarily release the gas inside the housing 1 to reduce the pressure. On the other hand, when it is in the negative pressure state, the process proceeds to step ST13, the control unit 25 opens the electromagnetic valve 42 to send the compressed gas in the pressure tank 41 to the housing 1, and The pressure P1 is monitored, and it is monitored whether P1> P0 (1 + α) is switched (step ST14). When P1> P0 (1 + α) is switched, the electromagnetic valve 42 is closed to stop the supply of the compressed gas. And it returns to step ST11 again and continues monitoring. On the other hand, after the solenoid valve 42 is opened and the supply of the compressed gas is started, while the condition P1> P0 (1 + α) is not satisfied, the step ST16-step ST
The operation of 12-step ST13-step ST14 is repeated, and this is monitored by a time timer (not shown), and t
If P1> P0 (1 + α) does not hold even after the lapse of seconds,
In step ST17, the alarm device (alarm means) is turned on to generate an alarm. The notification by this alarm is sent to the traffic center for notification, or the case 1 on the spot.
You can inform them above. This alarm continues until it is confirmed and reset by the operator, and when reset, the alarm by the alarm device is canceled and the alarm stops.
Then, the operation from step ST11 is repeated again. Although not shown in the flow chart, when the door open signal is ON, the electric motor 24 is stopped to avoid unnecessary pressurization.

Therefore, the following effects can be expected in the structure of the outdoor installation casing device according to the third embodiment. By the pressure adjusting operation by the pressure adjusting unit 21, the pressure inside the housing 1 is made equal to or higher than the external pressure so that the condition of P0 (1 + α) ≧ P1 = P0 is always satisfied, and the pressure is set. Thus, the outside air is prevented from being directly taken into the housing 1, so that it is possible to prevent suction of accumulated rainwater and moisture (water vapor), and at the same time, prevent salt damage and sulfur damage. Since the pressure display portion 22 including the rubber balloon 35 that is inflated by the pressure in the housing 1 and the pointer 36 and the index 38 is provided, the position of the pointer 36 that moves up and down due to the expansion and contraction of the rubber balloon 35 is used as the index 38. By associating with each other, the pressure in the housing 1 can be easily known. Since the compressed gas in the pressure tank 41 is supplied without taking in outside air, clean gas can be compressed and sent into the housing 1. As a result, the inside of the housing 1 can always be kept in a clean state. When the pressure inside the housing 1 exceeds a set value, a safety valve 27 that releases the air inside the housing 1 to the outside to reduce the pressure is provided. If the pressure inside the housing 1 increases abnormally, the safety valve 27 is activated. Since the gas is released to the outside to reduce the pressure, an explosion accident or the like can be prevented in advance. Since the pressure adjusting unit 21 is provided with an alarm means (external alarm device 32) that determines that the pressure inside the housing 1 is abnormal when the pressure inside the housing 1 is below a set value (negative pressure) and issues an alarm,
By knowing the alarm, the abnormal negative pressure inside the housing can be easily recognized. In addition, the alarm means is equipped with a timed timer that issues an alarm after a lapse of a certain time after it is judged to be abnormal, and the alarm is canceled when the abnormality disappears within a certain time, so that an abnormality occurs momentarily. No alarm will be given in such a case. Therefore, no alarm is issued when the normal state is restored immediately, so that it is possible to solve the problem that the alarm is issued even if there is some abnormality.

In the structure of the third embodiment as well, the structure in which the internal pressure sensor 26I and the external pressure sensor 26O are provided in the housing 1 has been disclosed. However, similar to the structure described in the second embodiment, for example, As shown in FIGS. 9 and 10, in the pressure display portion 22, the upper limit detection switch 2 is set within the movement range of the pointer 36 that moves up and down according to the expansion and contraction of the rubber balloon 35.
6h and the lower limit detection switch 26l are arranged, and when the pointer 36 crosses in front of the detection switch 26h or 26l, the pointer 36 is detected to detect the detection switch 26h or 26l.
The structure may be such that a signal is output from the.

[0031]

As described above, the present invention has the pressure adjusting portion for adjusting the difference between the internal pressure and the external pressure of the housing, and the pressure adjusting portion makes the internal pressure equal to or higher than the external pressure. For this reason,
It is possible to provide a housing device for outdoor installation, which has an excellent effect of preventing suction of accumulated rainwater and moisture (water vapor), preventing dew condensation in the device, and protecting internal devices.

[Brief description of drawings]

FIG. 1 is a layout configuration diagram of a road traffic system to which an enclosure device for outdoor installation according to a first embodiment of the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a bag body used in the outdoor installation casing device according to the first embodiment.

FIG. 4 is a layout configuration diagram of a road traffic system to which a housing device for outdoor installation according to a second embodiment of the present invention is applied.

FIG. 5 is a configuration layout diagram of a pressure adjusting unit according to the second embodiment.

FIG. 6 is a front view of a pressure display unit according to the second embodiment.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is a flowchart showing a pressure adjusting operation according to the second embodiment.

FIG. 9 is a front view showing a pressure display unit according to the second embodiment.

10 is a sectional view taken along line CC of FIG.

FIG. 11 is a layout configuration diagram of a road traffic system to which a housing device for outdoor installation according to a third embodiment of the present invention is applied.

FIG. 12 is a configuration layout diagram of a pressure adjusting unit according to the third embodiment.

FIG. 13 is a flowchart showing a pressure adjusting operation according to the third embodiment.

FIG. 14 is a layout configuration diagram of a road traffic system to which a conventional outdoor installation casing device is applied.

FIG. 15 is a sectional view taken along line DD of FIG.

[Explanation of symbols]

1 Case for outdoor installation 5 Electronic equipment unit 13 bags 13a bag 13b air hole 13c Pipe part 17 Display window 18 indicators 20 Small air compressor 21 Pressure regulator 22 Pressure display 23 unit body 24 electric motor 25 Control unit 26I External pressure sensor 26O External pressure sensor 27 Safety valve 32 External alarm device 33 display window 35 rubber balloons 36 guidelines 38 indicators 39 Air intake window 41 Pressure tank

Claims (6)

[Claims] 1. A pressure adjusting unit for adjusting the pressure inside the housing has a bag body having a portion communicating with the outside of the housing,
A casing device for outdoor installation, wherein a difference in pressure between the inside and outside of the casing is adjusted by changing the shape of the bag body. 2. A pressure adjusting section for sending gas into the housing, a pressure detecting section for detecting a pressure difference between the inside and the outside of the case, and a pressure of the pressure adjusting section based on a detection result of the pressure detecting section. An enclosure device for outdoor installation, comprising: an in-enclosure pressure control means for controlling adjustment. 3. The outdoor installation casing device according to claim 2, wherein an air filter is provided at an outside air intake port of the pressure adjusting unit for adjusting the pressure inside the casing. 4. The pressure of the inside of the housing is confirmed by providing an elastic balloon that expands and contracts due to a pressure difference between the inside of the housing and the outside air, and confirms the pressure inside the housing from the expansion and contraction of the balloon. Case device for outdoor installation. 5. The outdoor casing device according to claim 2, wherein the pressure adjusting unit is provided with alarm means for issuing an alarm when the pressure inside the casing becomes lower than a set value. 6. The outdoor installation according to claim 5, further comprising timed timer means for issuing an alarm after a lapse of a predetermined time after it is determined that the pressure inside the casing has become lower than a set value. Enclosure device.