JPH09270588A - Pressurized control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dewing in a control panel to be used in a place where the atmospheric pressure is low. SOLUTION: The outputs of a humidity sensor 10, a temperature sensor 11, a pressure sensor 12 in a control panel body 4 are taken into a control panel supervising apparatus 2, and the inside-the-panel environmental conditions are monitored, and the control panel body 4 is pressurized by the use of a compressor 9 and an auxiliary tank 5, and the internal pressure is kept at a standard pressure. At the time of humidity or temperature increase, a shut-off valve 7 and a pressure releasing valve 6 are opened to exhaust the internal air. On condition that the internal pressure has become a standard atmospheric pressure and that the internal temperature has lowered up to a set temperature, the shut-off valve 7 and the pressure releasing valve 6 are closed. As the result of this, the inside is perfectly sealed and keeps the standard atmospheric pressure again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a control panel, and more particularly to a function of maintaining the internal pressure of the control panel main body at the standard atmospheric pressure when the atmospheric pressure is lower than the standard atmospheric pressure. The present invention relates to the structure of a pressure type control board provided.

[0002]

2. Description of the Related Art In a control panel attached to a production line of a factory, the internal pressure of the control panel is equal to the atmospheric pressure except for those used in a dangerous atmosphere.

[0003]

When the altitude exceeds 2,000 meters due to the location of the factory, the atmospheric pressure becomes significantly lower than the standard atmospheric pressure (1 atmospheric pressure). In such an environment, since the temperature difference is large and the air is thin, the cooling performance inside the control panel is deteriorated and dew condensation is likely to occur, leading to deterioration in function and damage of electronic and electric devices inside the control panel. As a result, it is not preferable.

The present invention has been made in view of the above problems. Even when the atmospheric pressure is lower than the standard atmospheric pressure, the internal pressure of the control panel is maintained at the standard atmospheric pressure. It is intended to provide a structure in which condensation is prevented while improving cooling performance.

[0005]

The invention according to claim 1 is a structure of a control panel used under atmospheric conditions in which atmospheric pressure is lower than standard atmospheric pressure, wherein the internal pressure of the control panel main body is approximately standard atmospheric pressure. It is characterized by having the function of maintaining.

The invention according to claim 2 is the structure of a control panel used under atmospheric conditions in which the atmospheric pressure is lower than the standard atmospheric pressure, wherein the control panel main body is provided with an exhaust port capable of opening and closing.
Pressurizing means connected to the control panel body to pressurize the inside of the control panel body, a humidity sensor for detecting the humidity in the control panel body, and a pressure sensor for detecting the internal pressure of the control panel body. A board that controls the pressure exerted on the control panel body by the pressurizing means and the opening / closing control of the exhaust port so that the internal pressure of the control panel body becomes approximately the standard atmospheric pressure by inputting the output signals of the humidity sensor and the pressure sensor. And an internal pressure control means.

According to a third aspect of the present invention, in the second aspect of the present invention, a temperature sensor for detecting the temperature inside the control panel body is provided, and the output signal of the temperature sensor is a humidity sensor and a pressure sensor. It is characterized in that it is inputted to the in-board pressure control means together with the output signal of the sensor.

According to a fourth aspect of the present invention, in the invention according to the second or third aspect, the pressurizing means is connected to an auxiliary tank connected to the control panel body, and the auxiliary tank is connected via an opening / closing valve. On the other hand, the exhaust port is composed of a pressure release valve.

According to a fifth aspect of the present invention, the in-panel pressure control means in the fourth aspect of the invention causes the on-off valve and the pressure release valve to open when the humidity in the control panel body rises, while the control panel is opened. On the condition that the internal pressure and temperature of the main body are set allowable values, the on-off valve and the pressure release valve are respectively closed to close the control panel main body.

[0010]

According to the invention as set forth in claim 1, even when the external atmospheric condition of the control panel is lower than the standard atmospheric pressure, the internal pressure of the control panel main body is maintained at about the standard atmospheric pressure. It is possible to prevent dew condensation from occurring and protect electronic and electric devices in the control panel.

According to the second aspect of the present invention, the internal pressure and humidity of the control panel main body are monitored by the internal panel pressure control means, and when the humidity rises, the pressurizing means controls the pressure exerted on the control panel main body. Since the opening / closing control of the exhaust port is performed so that the internal pressure of the control panel body is controlled to be about the standard atmospheric pressure, the same effect as that of the invention according to claim 1 can be obtained, and in particular, the exhaust port is opened / closed. By controlling, the air circulates due to the pressure difference between the inside and outside of the control panel body, and the heat dissipation and cooling performance are greatly improved. Moreover, since the exhaust port is exclusively used for the exhaust flow from the inside of the control panel body having a high pressure to the outside of the control panel body having a low pressure, it is possible to reliably prevent the entry of dust or dust into the control panel body.

According to the invention described in claim 3, according to claim 2,
Since the temperature is monitored in addition to the monitoring of the internal pressure and humidity of the control panel body in the invention described in claim 2, in addition to the effect similar to that of the invention described in claim 2, the control panel body is set to the standard atmospheric pressure. There is an advantage that more precise control can be performed in order to keep it.

According to the invention described in claim 4, since the auxiliary tank that constitutes the pressurizing means together with the compressor assists the compressor, in addition to the same effect as the invention described in claim 2 or 3, By the pressure accumulating action of the auxiliary tank, the capacity of the compressor can be reduced and the pressure fluctuation due to pulsation can be prevented to stabilize the internal pressure. In addition, since the exhaust port is composed of an opening / closing valve, there is an advantage that the opening / closing operation can be smoothly performed.

According to the fifth aspect of the present invention, when the humidity rises, the on-off valve and the pressure release valve are opened to temporarily circulate the air inside and outside the control panel body, but the internal pressure and temperature are within the set allowable values. For example, since the on-off valve and the pressure release valve are closed and hermetically closed, in addition to the same effect as the invention according to claim 4, there is little waste of energy and the condition for the occurrence of dew condensation is promptly eliminated. There is an effect that can be done.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a typical embodiment of the present invention, in which a plurality of control panels 1, 1 ... Which are placed under an environment where atmospheric pressure is lower than standard atmospheric pressure are controlled by a single control. Board management device 2
Shows an example of centralized management in.

As shown in FIG. 1, a plurality of control panels 1, 1 ... Attached to the production line are individually connected to corresponding production machines (not shown) via a bus bar 3 and the internal pressure of the panel is controlled. It is connected to a common control panel management device 2 as a control means.

Each control panel 1 is provided with an auxiliary tank 5 which communicates with the inside of the control panel body 4, and an openable and closable solenoid valve type pressure release valve 6 which functions as an exhaust port. It is provided. Further, the auxiliary tanks 5 attached to the respective control panel bodies 4 are connected to a common dryer 8 through independent solenoid valve type opening / closing valves 7 and further connected to a common compressor 9 above them. Each on-off valve 7 is opened and closed by the command from the corresponding control panel 1 together with the pressure release valve 6 described above. The auxiliary tank 5 and the compressor 9 constitute a pressurizing means for pressurizing the inside of each control panel body 4.

Further, each control panel body 4 is provided with a humidity sensor 10 for detecting internal humidity, a temperature sensor 11 for detecting internal temperature, and a pressure sensor 12 for detecting internal pressure. The output signals of 10, 11, and 12 are taken into the control panel management device 2.

On the other hand, the control panel management device 2 to which the outputs of the respective sensors 10, 11, 12 are input is composed of a personal computer, and as shown in FIG. 14, a panel state management unit 15, a pressure release valve control unit 16, and an opening / closing valve control unit 17. Then, using the humidity, temperature and pressure inside each control panel body 4 as parameters, the environmental condition inside each control panel body 4 is estimated by the procedure as shown in FIG. A valve opening drive signal or a valve closing drive signal for the valve 7 is output.

As is well known, each control panel 1 has a door (not shown), but when the pressure release valve 6 and the open / close valve 7 are closed in addition to this door, the inside is completely sealed. It is configured to be a structure.

In the control board constructed as described above, the processing for keeping the inside of each control board body 4 at the standard atmospheric pressure is carried out according to the procedure shown in the flowchart of FIG. It is executed individually for each.

That is, in the control panel management device 2 shown in FIG. 1, the actually measured humidity value obtained by the humidity sensor 10 is compared with a preset allowable value (set humidity) to determine whether dew condensation is likely to occur. It is determined whether there is any (step S1 in FIG. 3). If the measured humidity exceeds the set value, it is judged that the possibility of dew condensation is high and the corresponding control panel 1
The opening signal of the opening / closing valve 7 and the opening signal of the pressure releasing valve 6 are output to open the opening / closing valve 7 and the pressure releasing valve 6 respectively (steps S3 and S4).

On the other hand, if the measured humidity value does not exceed the set value in step S1, the process proceeds to the next step S2, and it is determined whether the internal temperature of the control panel body 4 exceeds the allowable value (set temperature). That is, the measured temperature value obtained by the temperature sensor 11 is compared with a preset set value, and if the measured temperature value exceeds the set value, opening / closing of the corresponding control panel 1 in steps S3 and S4. When the valve 7 and the pressure release valve 6 are opened, and the set values are not exceeded, the on-off valve 7 and the pressure release valve 6 are closed in steps S5 and S6, and an instruction to end the internal pressure control is given. Unless otherwise, the processing from step S1 is repeatedly executed (step S
7).

By opening the on-off valve 7 and the pressure release valve 6 in steps S3 and S4 as described above, the compressed air from the compressor 9 of FIG. It is introduced inside, and at the same time, the inside of the control panel body 4 is released to the atmosphere via the pressure release valve 6. At this time, by adjusting the opening area of the pressure release valve 6 in advance, the inside of the control panel body 4 can be in a pressurized state while being released to the atmosphere via the pressure release valve 6. As a result, as the compressed air is introduced into the control panel body 4, the air in the control panel body 4 is gradually discharged from the pressure release valve 6, so that the heat dissipation of the control panel body 4 and thus the cooling performance is improved. improves.

Further, the pressure release valve 6 is provided inside the control panel body 4.
Even if the control panel body 4 is exposed to the atmosphere via the internal pressure, the internal pressure of the control panel body 4 is higher than the atmospheric pressure, so that external dust and dirt will not enter the control panel body 4 through the pressure release valve 6.

Here, the auxiliary tank 5 functions as an accumulator (accumulator) that assists the compressor 9, contributes to reducing the capacity of the compressor 9, and absorbs the pulsation of the compressed air from the compressor 9.

Then, after the on-off valve 7 and the pressure release valve 6 are opened as described above, in step S8, the measured pressure value obtained by the pressure sensor 12 and the preset allowable value (set pressure) are set. By comparison, it is determined whether the internal pressure of the control panel body 4 is normal (proper). The set pressure value is set to the standard pressure (1 atmospheric pressure) or a value having a predetermined tolerance.

When the internal pressure of the control panel body 4 is normal, the processing from step S1 is repeatedly executed, while when the internal pressure deviates from the set value, the process proceeds to the next step S9 and the internal pressure is changed. Determine whether it is higher or lower than the set value. Then, when the internal pressure is higher than the set value, a closing signal of the open / close valve 7 is output to close the open / close valve 7 (step S10). On the contrary, when the internal pressure is lower than the set value, the pressure is released. After a valve closing signal is output to the valve 6 to close the pressure release valve 6 (step S11), the processes after step S8 are repeatedly executed.

As described above, according to this embodiment, basically, even though the atmospheric pressure is lower than the standard atmospheric pressure, the inside of the control panel body 4 is sealed and the internal pressure is kept at the standard atmospheric pressure. Since the dew condensation is less likely to occur, it is possible to prevent malfunction or damage due to dew condensation on the electronic or electric equipment in the control panel body 4 in advance.

When the humidity inside the control panel body 4 becomes high and dew condensation is likely to occur, or when the internal temperature becomes high, the on-off valve 7 and the pressure release valve 6 are both opened. By introducing compressed air into the control panel body 4 and discharging the air inside the control panel body 4 to perform heat dissipation and scavenging, the internal pressure is kept at the standard atmospheric pressure, so that condensation is prevented and heat dissipation is improved at the same time. As a result, the cooling performance will be greatly improved.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a typical embodiment of the present invention.

FIG. 2 is a block circuit diagram of the control panel management device shown in FIG.

FIG. 3 is a flowchart showing a processing procedure in the control panel management device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control panel 2 ... Control panel management device (panel pressure control means) 4 ... Control panel body 5 ... Auxiliary tank (pressurizing means) 6 ... Pressure release valve 7 ... Open / close valve 9 ... Compressor (pressurizing means) 10 ... Humidity sensor 11 Temperature sensor 12 Pressure sensor

Claims (5)

[Claims] 1. A structure of a control panel used under atmospheric conditions in which atmospheric pressure is lower than standard atmospheric pressure, which has a function of maintaining the internal pressure of the control panel main body at approximately standard atmospheric pressure. Pressurized control panel. 2. A structure of a control panel used under atmospheric conditions in which atmospheric pressure is lower than standard atmospheric pressure, the control panel main body having an openable / closable exhaust port, and the control panel main body connected to the control panel main body. Pressurizing means for pressurizing the inside of the control panel body, a humidity sensor for detecting the humidity in the control panel body, a pressure sensor for detecting the internal pressure of the control panel body, and output signals of the humidity sensor and the pressure sensor. And an in-board pressure control means for controlling the pressure exerted by the pressurizing means on the control board body and the opening / closing control of the exhaust port so that the internal pressure of the control board body becomes approximately standard atmospheric pressure. Pressurized control panel that is characterized by. 3. A temperature sensor for detecting the temperature inside the control panel body, wherein the output signal of the temperature sensor is input to the panel pressure control means together with the output signals of the humidity sensor and the pressure sensor. The pressurizing type control panel according to claim 2, wherein 4. The pressurizing means comprises an auxiliary tank connected to the control panel body and a compressor connected to the auxiliary tank via an opening / closing valve, while the exhaust port is a pressure release valve. The pressurizing type control panel according to claim 2 or 3, wherein 5. The control means for controlling the internal pressure of the control panel opens the on-off valve and the pressure release valve respectively when the humidity in the control panel main body rises, while the internal pressure and temperature of the control panel main body are set allowable values. The pressurizing type control panel according to claim 4, wherein the control panel main body is hermetically closed by closing the on-off valve and the pressure release valve respectively.