JP3988282B2 - Programmable controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a programmable controller in which a DIN rail mounting groove is formed in an exterior case incorporating a printed wiring board.
[0002]
[Prior art]
Conventionally, in a small programmable controller, electronic components are mounted at high density on a printed wiring board built in the outer case, and the printed wiring board is arranged in a narrow space, and the temperature inside the outer case is reduced. In view of the fact that it easily rises, a slit hole is formed in the outer case to secure a ventilation path so that air warmed by the heat generated by the electronic components is released.
[0003]
[Problems to be solved by the invention]
However, in such a configuration, since the inside of the programmable controller can be seen from the slit hole, the appearance is not good. In addition, when the programmable controller is installed so that the slit hole is located on the upper surface, foreign matter (metal powder such as chips) may enter the programmable controller through the slit hole and cause malfunction of the device. .
[0004]
The present invention has been made in view of the above circumstances, and its purpose is to prevent the appearance of the appearance from deteriorating in the configuration that suppresses the temperature rise in the exterior case using the ventilation holes, and from the ventilation holes. An object of the present invention is to provide a programmable controller capable of preventing entry of foreign matter.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, whether the exterior case is attached to the DIN rail by the DIN rail attachment groove or the exterior case is directly attached to the panel, the DIN rail attachment Since the groove functions as a ventilation duct, the ventilation hole formed in the DIN rail mounting groove communicates with the outside through the DIN rail mounting groove. As a result, when the temperature of the air in the exterior case rises due to heat generation of the printed wiring board, the warmed air is discharged from the ventilation hole to the outside of the exterior case and is diffused through the DIN rail mounting groove. Air corresponding to the amount of air thus entered enters the outer case from the ventilation hole through the DIN rail mounting groove. Therefore, since the ventilation path which passes through the inside of an exterior case can be formed, the temperature rise in an exterior case can be suppressed.
[0006]
According to the second aspect of the present invention, the ventilation holes are provided so as to form a ventilation path that passes through the printed wiring board in the exterior case, so that the temperature rise of the printed wiring board can be efficiently suppressed.
[0007]
According to the invention of claim 3, when the first case and the second case are integrated to assemble the exterior case, the auxiliary ventilation hole is formed by the first case and the second case. In addition to the ventilation path through the ventilation hole formed in the rail mounting groove, the warmed air inside the exterior case can be discharged also by the ventilation path through the auxiliary ventilation path, and the heat dissipation efficiency can be improved.
[0008]
In this case, since the auxiliary ventilation hole is formed in a shape concealed inside, the appearance does not deteriorate, and even if the foreign object falls into the auxiliary ventilation hole, the foreign object enters the outer case. There is no end to it.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
1 is a bottom perspective view of a programmable controller (hereinafter referred to as a PC), FIG. 2 is a rear perspective view of the PC, FIG. 3 is a front perspective view of the PC, FIG. 4 is a bottom view of the PC, and FIG. It is sectional drawing. 1 to 5, the outer case 2 of the PC 1 is formed by combining an upper case 3 and a lower case 4, and a printed wiring board 5 (shown only in FIG. 5) is formed in the lower part of the outer case 2. ) Is arranged. A terminal block 6 is mounted on the printed wiring board 5, and the terminal block 6 faces the outside from the outer case 2.
[0010]
In FIG. 5, a display printed wiring board 7 is disposed in the upper part of the exterior case 2, and a chip LED 8 is mounted on the display printed wiring board 7. In this case, the upper case 3 is provided with a light guide portion 9, and light from the chip LED 8 is emitted from the upper surface of the upper case 3 by the light guide portion 9.
A cover 10 is pivotally supported on the upper surface of the exterior case 2, and the upper side of the terminal block 6 is opened by rotating the cover 10.
[0011]
On the other hand, a DIN rail mounting groove 11 is formed on the bottom surface of the outer case 2. That is, a pair of leg portions 12 are formed to protrude from the bottom surface of the outer case 2, and a DIN rail mounting groove portion 11 is formed between the leg portions 12. In this case, a fixed claw portion 13 for locking one end of the DIN rail is formed on one leg portion 12, and a movable portion for locking the other end of the DIN rail is formed on the other leg portion 12. The claw portion 14 is slidably provided, and the PC 1 can be locked to the DIN rail 15 as shown in FIG. 6 by the cooperative operation of the fixed claw portion 13 and the movable claw portion 14.
[0012]
Here, as shown in FIG. 1, ventilation holes 16 are formed in predetermined portions of the DIN rail mounting groove 11. That is, as shown in FIG. 1, a ventilation hole 16 is formed in a portion from the inner wall of the leg portion 12 to the bottom surface of the DIN rail mounting groove portion 11, and the ventilation hole 16 forms the exterior in the DIN rail mounting groove portion 11. The outside and the inside of the case 2 communicate with each other. In this case, the part where the ventilation hole 16 is formed corresponds to the corner of the printed wiring board 5 arranged in the exterior case 2.
[0013]
In addition, an attachment hole 17 is formed in the exterior case 2, and the PC 1 can be directly attached to the panel as shown in FIG. 7 by being screwed through the attachment hole 17.
[0014]
The PC 1 is a small type, and electronic parts are mounted on the printed wiring board 5 with high density and the printed wiring board 5 is disposed in a narrow space. The air in 2 tends to be hot. For this reason, it is necessary to prevent the warmed air from escaping from the exterior case 2 to the outside and causing the temperature in the exterior case 2 to rise excessively.
[0015]
Here, when the PC 1 is mounted on the DIN rail 15 in the horizontal direction as shown in FIG. 6, in addition to the DIN rail mounting groove 11 functioning as a ventilation duct, As shown in FIG. 8, the air warmed in the outer case 2 is discharged from the vent hole 16 positioned above by convection and the gap between the leg portion 12 and the board as shown in FIG. At the same time, air corresponding to the amount of discharged air enters mainly from the gap between the leg portion 12 and the board and flows into the exterior case 2 from the vent hole 16 positioned below. It becomes like this. Thereby, since the ventilation path which passes the printed wiring board 5 incorporated in the exterior case 2 is formed, the excessive temperature rise of the printed wiring board 5 can be suppressed.
[0016]
On the other hand, as shown in FIG. 7, when the PC 1 is fixed in close contact with the board in the horizontal direction, the leg portion 12 is in close contact with the board, but the DIN rail mounting groove 11 functions as a ventilation duct. As shown in the figure, the air warmed in the outer case 2 is discharged from the vent hole 16 positioned above by convection and diffused through the DIN rail mounting groove 11, and at the same time, the air corresponding to the discharged air amount is DIN. It flows into the exterior case 2 from the vent hole 16 located below through the rail mounting groove 11. Thereby, since the ventilation path which passes the printed wiring board 5 incorporated in the exterior case 2 is formed, the excessive temperature rise in the exterior case 2 can be suppressed.
[0017]
Similarly, when the PC 1 is mounted in the vertical direction, the DIN rail mounting groove 11 functions as a ventilation duct as shown in FIG. 10, and therefore the exterior case is passed through the ventilation hole 16 positioned above the DIN rail mounting groove 11. At the same time as the warm air in 2 is discharged, the air flows into the outer case 2 through the ventilation holes 16 located below. Therefore, since a ventilation path that passes through the printed wiring board 5 built in the outer case 2 is formed, an excessive temperature rise in the outer case 2 can be suppressed.
[0018]
According to the present embodiment, the ventilation path 16 that passes through the exterior case 2 is formed by forming the ventilation path 16 in the groove 11 for DIN attachment formed in the exterior case 2, so that the PC 1 is connected to the DIN rail. 15 or the state in which the PC 1 is mounted in close contact with the panel, the DIN rail mounting groove 11 can function as a ventilation duct. Therefore, since a ventilation path can be reliably formed in the PC 1 through the DIN rail mounting groove 11, an excessive temperature rise in the outer case 2 can be suppressed. In this case, since the ventilation hole 16 is formed in the groove 11 for DIN rail attachment, it becomes a form concealed from the outside, and the appearance of the PC 1 does not deteriorate.
[0019]
In addition, since the position of the ventilation hole 16 is set so as to form a ventilation path that passes through the printed wiring board 5 disposed in the exterior case 2, the air heated by heat generated from the printed wiring board 5 is effectively used. Can be diffused to the outside, and an excessive temperature rise of the printed circuit board 5 can be prevented.
[0020]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 11 to FIG. 13. The same parts as those of the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted. explain. The second embodiment is characterized in that an auxiliary ventilation hole having a shape concealed inside is formed on the side surface of the exterior case 2.
[0021]
That is, as shown in FIGS. 11 and 12, an auxiliary ventilation hole 18 is formed on the front side of the exterior case 2. This auxiliary ventilation hole 18 is formed by combining the upper case 3 and the lower case 4 as shown in FIG. 12, and the end of the lower case 4 is formed on the front surface of the recess 19 formed in the upper case 3. The auxiliary ventilation hole 18 is formed in the shape which concealed the inside by positioning.
[0022]
According to such a configuration, the ventilation path is formed through the auxiliary ventilation hole 18 in addition to the ventilation hole 16 formed in the DIN rail mounting groove 11 as shown in FIG. The heat dissipation efficiency of the PC 1 can be increased as compared with the above.
[0023]
In this case, since the auxiliary ventilation hole 18 is formed in a shape concealed inside, the appearance of the PC 1 is not deteriorated, and the PC 1 is arranged so that the surface on which the auxiliary ventilation hole 18 is formed is the upper surface. Even if it is a case, it can prevent that the foreign material which fell to the auxiliary ventilation hole 18 penetrate | invades in the exterior case 2, and PC1 malfunctions.
[0024]
The present invention is not limited to the above embodiment, and a number of slit-like ventilation holes may be formed in the DIN rail mounting groove 11.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bottom surface side of a programmable controller showing a first embodiment of the present invention. FIG. 2 is a perspective view of a rear surface side of the programmable controller. ] Bottom view of the programmable controller [Fig. 5] Cross section of the programmable controller [Fig. 6] Cross section of the programmable controller shown in the mounted state on the DIN rail [Fig. 7] Cross section of the programmable controller shown in the directly mounted state on the panel [ FIG. 8 is a schematic diagram showing the ventilation path of the programmable controller shown in the state of being attached to the DIN rail. FIG. 9 is a diagram showing the ventilation path of the programmable controller shown in the state of being attached to the panel. FIG. 11 is a diagram showing a ventilation path shown in a state of being caught; Figure 2 corresponds diagram showing an embodiment [12] FIG. 5 corresponding to FIG. 13 is a schematic diagram of a programmable controller section showing a ventilation path EXPLANATION OF REFERENCE NUMERALS
1 is a programmable controller, 2 is an exterior case, 3 is an upper case (first case), 4 is a lower case (second case), 5 is a printed wiring board, 11 is a groove for attaching a DIN rail, and 15 is a DIN rail. , 18 are auxiliary ventilation holes.

Claims (3)

In a programmable controller in which a DIN rail mounting groove is formed in an exterior case containing a printed wiring board,
The DIN rail mounting groove portion is provided with a ventilation hole on the air inflow side and a ventilation hole on the air discharge side, which form a ventilation path that passes through the exterior case,
A programmable controller, wherein the DIN rail mounting groove functions as a ventilation duct .   The programmable controller according to claim 1, wherein the ventilation hole is provided so as to form a ventilation path that passes through the printed wiring board. The outer case is configured by combining the first case and the second case and having an auxiliary ventilation hole,
The auxiliary ventilation hole is formed in a shape concealing the inside of the exterior case by positioning the end portion of the second case in front of the end portion of the first case. Item 3. A programmable controller according to item 1 or 2.

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