JP4493589B2 - Cooling method inside control panel, control panel, and control system - Google Patents

Description

  The present invention relates to a method for cooling the inside of a control panel equipped with an air dew point meter.

Currently, in order to cool the inside of the control panel in which the control device is housed, air outside the control panel is used (for example, see Patent Document 1) or a cooling device is provided (for example, Patent Document 2). See).
Japanese Laid-Open Patent Publication No. 10-23618 Japanese Laid-Open Patent Publication No. 9-152284

  If the control panel is cooled with air from the outside, dust or the like may enter the control panel and adversely affect the control device. However, it is costly to bother to provide a filter to clean the air.

  Then, an object of this invention is to provide the method and apparatus which cool the inside of a control apparatus efficiently using clean air.

  A cooling method according to the present invention is a method for cooling the inside of a control panel equipped with a control device and a dew point meter for measuring the dew point of air, and the compressed compressed air for pneumatic equipment is supplied to the dew point meter. Supplying and cooling the control device using air exhausted from the dew point meter. The method for cooling the control device may include a step of guiding the air exhausted from the dew point meter to the control device. Here, the compressed compressed air for pneumatic equipment includes not only the purified compressed air used for pneumatic equipment but also compressed air purified for use in pneumatic equipment. It may be clean compressed air distributed to be supplied to the dew point meter before use.

  A control panel according to the present invention is a control panel including a control device and a dew point meter for measuring the dew point of air, supply means for supplying the compressed compressed air for pneumatic equipment to the dew point meter, and the dew point It has a cooling means which cools a control device using the air exhausted from the meter. The cooling means may include a discharge port of air exhausted from the dew point meter and an air discharge port provided in the housing of the control panel provided inside the control panel, or exhaust from the dew point meter. A pipe for guiding the air to the control device, a discharge port for discharging the air guided to the control device, and an air discharge port provided in a housing of the control panel.

  A control system according to the present invention is a system including a control panel, a pneumatic device, and a compressed air purifier for cleaning compressed air for use in the pneumatic device. It is a control panel provided with a dew point meter for measuring the dew point of the air cleaned by the compressed air cleaner, and a cooling means for cooling the control device using the air exhausted from the dew point meter. Air that has been exhausted from the pneumatic device may be introduced into the control panel. The cooling means may include an air outlet provided in the control panel and an air outlet provided in the housing of the control panel, or an air outlet provided in the housing of the control panel. A pipe for guiding the exhausted air to the control device, a discharge port for discharging the air guided to the control device, and an air discharge port provided in the housing of the control panel may be included.

  By implementing the cooling method according to the present invention, the inside of the control panel can be efficiently cooled using clean air.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the disclosure of the present invention exemplifies a preferred embodiment for carrying out the present invention, the present invention is not limited by the exemplification. It will be apparent to those skilled in the art that various modifications and variations can be made based on the description of the specification within the spirit and scope of the invention.

(1) Control board The control board used as the object of the present invention is provided with a control device and a dew point meter. As a preferred example, a control device (sequencer) for controlling the dehumidifying device in sequence and a dew point meter for measuring the dew point of compressed air dehumidified by the dehumidifying device for use in pneumatic equipment can be considered. Because compressed air for pneumatic equipment is generally cleaned by a compressed air cleaner to avoid problems in valves, motors and other pneumatic equipment when air contaminated with dust or oil mist is used. It is. In the present invention, compressed air for pneumatic equipment that has passed through the dew point meter is released into the control panel. Therefore, when air containing dust or the like is used as cooling air, there is a problem such as a short circuit of the control device wiring. The problem of being caused can be avoided. Furthermore, as in this example, the use of dehumidified compressed air may cause problems such as rusting of devices in the control panel as compared with a cooling method using humid air as cooling air. To reduce. The control device is not limited to a sequencer for controlling the dehumidifying device, but is preferably a device that is required to be cooled.

  FIG. 1 is a schematic diagram showing an example of the internal structure of a control panel according to the present invention. A control device 2 and a dew point meter 3 are housed inside the housing 1 of the control panel 10. Compressed air is introduced from the air compressor 4 into the control panel 10, and the dew point is measured when the compressed air passes through the dew point meter 3.

  The control panel 10 is provided with a discharge port 5 for releasing air exhausted after passing through the dew point meter 3 so that the air exhausted from the dew point meter 3 is released into the control panel 10. If the dew point meter 3 is housed in the lower part of the control panel 10 as shown in FIG. 1, the exhaust port of the dew point meter 3 may be used as the discharge port 5 as it is. The discharge port 5 may further include a backflow prevention valve for preventing the backflow of the released air at the exhaust port of the dew point meter 3, or a flow rate for adjusting the flow rate of the discharged air. A control valve may be provided. In addition, when the air exhausted from the dew point meter 3 is discharged from the discharge port 5, it is preferable that the air flow is efficiently generated in the control panel 10, and a blower or the like is provided in the discharge port 5 as the means. Also good.

  On the other hand, the casing 1 of the control panel 10 is provided with an air discharge port 7 for discharging the air in the control panel 10 to the outside. Here, the position where the air discharge port 7 is installed is that the air flow caused in the control panel 10 until the air discharged from the discharge port 5 is discharged from the control panel 10 makes the control device 2 efficient. For example, when the dew point meter 3 is at the lower part of the control panel 10 as shown in FIG. 1, the air outlet 7 is preferably at the upper part. The air discharge port 7 is preferably provided with backflow prevention means so that external air does not flow back into the control panel 10, and may be provided with a backflow prevention damper, for example. As a result, it is possible to avoid the problem that dust or the like contained in the external air enters the control panel and causes a failure such as a short circuit of the control device.

  Next, FIG. 2 shows the internal structure of the control panel in the second embodiment of the present invention. Here, as a means for releasing the air for cooling into the control panel 10, a pipe 6 for guiding the air exhausted from the dew point meter 3 to the control device 2 is provided, and the air outlet 5 is provided at the tip of the pipe 6. Provide. The material and structure of the pipe 6 may be those generally used for passing air, for example, a vinyl hose. The method of providing the pipe 6 in the control panel and its shape and positioning are not subject to other restrictions as long as they satisfy the spirit of the present invention.

  On the other hand, the casing 1 of the control panel 10 is provided with an air discharge port 7 for discharging the air inside the control panel 10 to the outside, as in the first embodiment. Here, each position of the pipe 6, the discharge port 5, and the air discharge port 7 is determined by the flow of air caused in the control panel until the air discharged into the control panel is discharged. It is preferable that it is a position which can cool efficiently. For example, when the control device 2 is housed in the upper portion as shown in FIG. 2, it is desirable that the discharge port 5 be provided further above the control device and the air discharge port 7 be provided in the lower portion of the housing 1. Further, it is more preferable that the discharge port is arranged so that the air discharged from the discharge port directly hits the control device, while the air discharge port 7 has a backflow prevention means so that external air does not flow back into the control panel. More preferably, for example, a backflow prevention damper may be provided. The method of providing the air discharge port 7 in the housing 1 and the shape and positioning thereof are not subject to other restrictions as long as they satisfy the spirit of the present invention.

  As described above, in the second embodiment of the cooling method of the present invention, by providing the pipe 6, the discharge port 5 for releasing the air exhausted from the dew point meter 3 for cooling the control device 2 is provided to the control device. Since it can install near 2, control apparatus can be cooled more efficiently.

  As in these embodiments, by using the air that has passed through the dew point meter to cool the inside of the control panel, it is not necessary to provide a separate cooling device. Therefore, the use of the control panel of the present invention provides a cost reduction effect.

  In addition, some of the components that can be included in the control device that can be cooled by the cooling method of the present invention, such as a condenser, have a shorter life when exposed to a temperature higher than room temperature, for example, 50 ° C. or higher. However, by cooling the control device by the cooling method of the present invention, the life of such a condenser or the like is extended. As a result, the interval at which maintenance of the control panel needs to be performed is extended, and as a result, the cost and labor required for maintenance of the control panel are reduced.

(2) Control system It is preferable that the air used with the control panel which concerns on this invention is the purified air, Therefore, it is preferable that a control system is provided with an air cleaner. Thereby, troubles inside the control panel due to dirty air can be prevented, and the need for maintenance of the control panel is reduced. Therefore, the cost and labor required for maintenance of the entire control system are reduced.

  In general, compressed air used in pneumatic equipment is cleaned by a compressed air cleaner as described above. Accordingly, as a preferred example of the control system of the present invention, a system including a control panel subjected to the above-described cooling method, a pneumatic device, and a compressed air cleaner for cleaning compressed air for use in the pneumatic device can be considered. .

  In this control system, a circuit for introducing air for cooling into the control panel (supplying means for supplying the compressed compressed air for pneumatic equipment to the dew point meter) is a compressed air purifier 30 as in the example of FIG. It may be designed so that the air cleaned in step 1 is introduced into the control panel 10 through the pneumatic device 20, or is supplied to the pneumatic device 20 from the compressed air cleaner 30 as in the example of FIG. You may design so that air may be distributed and introduced into the control panel 10 in the middle.

  Furthermore, the control system that can be constructed according to the present invention is not limited to the components shown in the example of FIG. 3 or 4 as long as air for cooling the control panel is introduced into the control panel. May be included.

It is the schematic diagram which showed the internal structure of the control panel 10 in the 1st embodiment of this invention. The dotted arrows show the outline of the air flow. It is the schematic diagram which showed the internal structure of the control panel 10 in the 2nd embodiment of this invention. The dotted arrows show the outline of the air flow. It is the schematic diagram which showed the 1st example about the relationship between the air cleaner 30, the pneumatic equipment 20, and the control panel 10 in the control system which concerns on this invention. Arrows indicate the direction of air flow. It is the schematic diagram which showed the 2nd example about the relationship between the air cleaner 30, the pneumatic equipment 20, and the control panel 10 in the control system which concerns on this invention. Arrows indicate the direction of air flow.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Control apparatus 3 Dew point meter 4 Air compressor 5 Release port 6 Piping 7 Air discharge port 10 Control panel 20 Pneumatic equipment 30 Compressed air cleaner

Claims (9)

  A method of cooling the inside of a control panel equipped with a control device and a dew point meter for measuring the dew point of air, supplying clean compressed air for pneumatic equipment to the dew point meter and exhausting from the dew point meter A method of cooling a control device with air.   2. The method of claim 1 including the step of directing air exhausted from the dew point meter to the controller.   A control panel having a control device and a dew point meter for measuring the dew point of air, using supply means for supplying clean compressed air for pneumatic equipment to the dew point meter, and air exhausted from the dew point meter And a cooling means for cooling the control device.   The said cooling means includes the discharge port of the air exhausted from the said dew point meter provided in the inside of a control panel, and the air exhaust port provided in the housing | casing of the control panel. Control panel as described.   The cooling means includes a pipe for guiding the air exhausted from the dew point meter to the control device, a discharge port for discharging the air guided to the control device, and an air discharge port provided in a housing of the control panel. The control panel according to claim 3. A control panel;
Pneumatic equipment,
A compressed air cleaner for cleaning compressed air for use in the pneumatic device;
With
The control panel
A control device;
A dew point meter for measuring the dew point of the air cleaned by the compressed air cleaner;
Cooling means for cooling the control device using air exhausted from the dew point meter;
Control system with.   The control system according to claim 6, wherein the purified air is air exhausted from the pneumatic device.   7. The cooling device according to claim 6, wherein the cooling means includes a discharge port for air exhausted from a dew point meter and an air discharge port provided in a housing of the control panel, which are provided inside the control panel. Item 8. The control system according to Item 7. The cooling means includes a pipe for guiding the air exhausted from the dew point meter to the control device, a discharge port for discharging the air guided to the control device, and an air discharge port provided in the housing of the control panel. The control system according to claim 6 or 7, characterized by the above.

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