JP2002026557A - Cooling structure of control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cooling structure of a control panel capable of reducing the size of a box while securing the amount of heat radiated outside the panel and eliminating a difference in temperature in the panel. SOLUTION: The inside of a box 2 is vertically divided into an amplifier receiving portion 6 having a large amount of heat and a power source receiving portion 5 having a small amount of heat and an air duct 20 for connecting a lower duct 21 between the power source receiving portion 5 and the amplifier receiving portion 6, a rear duct 22 behind the amplifier receiving portion 6, and an upper duct 23 above the amplifier receiving portion 6 is formed and a cooling fan is disposed in the air duct 20. Heat radiating fins 25, 26 are provided in the lower and the upper ducts 21, 23, respectively, and in-panel fins 27b extending radially from the center to the outside are arranged in the power source receiving portion 5 and the amplifier receiving portion 6 and circulating fans 31, 32 are arranged in the centers of the in-panel fins 27b, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control panel in which an amplifier, a power supply and the like as heat generating elements are housed and arranged in a housing, and more specifically, radiates heat generated from the amplifier, the power supply and the like to the outside of the panel. In addition, the present invention relates to a cooling structure that is uniformly dispersed throughout the panel.

[0002]

2. Description of the Related Art For example, an NC machine tool is provided with a control panel for driving and controlling various drive motors, hydraulic pumps and the like. This type of control panel houses heating devices and components such as spindle amplifiers, power supply modules, transformers, and reactors. The heat generated from these components is radiated outside the panel, causing abnormal temperatures inside the panel. In some cases, a heat exchanger for suppressing the rise is provided.

In disposing such a heat exchanger in a panel, it is difficult to mount the heat exchanger inside the housing due to the arrangement of the heat-generating devices and heat-generating components, or the wiring.
Therefore, conventionally, as shown in FIG.
It is common to attach a heat exchanger 52 to the first heat exchanger 1 (see, for example, Japanese Patent Publication No. 2876583).

The heat exchanger 52 draws in cooling air outside the panel by the fan 53 outside the panel and discharges it out of the panel from the lower end port 54, and discharges the air in the panel sucked by the fan 55 in the panel from the upper end port 56. Cooling is performed via the heat radiating plate 57.

[0005]

However, in the case where the heat exchanger is mounted on the door as in the prior art, the depth of the door is increased by the size of the heat exchanger, resulting in an increase in the size of the control panel. There is.

Further, when the air in the panel is sucked from the lower end to release the heat and then discharged from the upper end as in the prior art, air flows only in the vicinity of the discharge port, and the whole area in the panel is agitated. As a result, there is a problem that a temperature difference between a high temperature portion and a low temperature portion in the panel becomes large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and it is possible to reduce the size of a housing while securing the heat radiation outside the panel and to cool a control panel capable of eliminating a temperature difference inside the panel. It is intended to provide structure.

[0008]

According to the present invention, there is provided a cooling structure for discharging heat from the heat-generating elements to the outside of a substantially hermetically sealed control panel in which heat-generating elements such as an amplifier and a power supply are housed and arranged in a housing. A first heat-generating element housing for accommodating a first heat-generating element having a large calorific value, and a second heat-generating element housing for accommodating a second heat-generating element having a smaller calorific value than the first heat generating element. A lower duct portion which is located between the first and second heat generating element storage portions in the housing; and a lower duct portion which is located on the rear side of the first heat generation element storage portion following the lower duct portion. Forming an air duct portion formed by connecting a rear duct portion to be connected and an upper duct portion located above the first heat generating element storage portion following the rear duct portion, and the lower duct portion is formed in the air duct portion. Through the air duct through the air sucked from the air inlet A cooling fan for discharging air from an air discharge port of the upper duct portion; a radiating fin disposed at least in the upper duct portion; and a fin outside the panel located in the upper duct portion and the first heat generating fin. And a fin in the panel located in the element storage portion. Further, the fins in the panel are arranged so as to extend radially outward from the center, and a circulation fan is provided in the center of the fins in the panel. It is characterized by:

[0009]

According to the control panel cooling structure of the present invention, the inside of the housing is vertically divided into a first heat-generating element accommodating portion having a large heat value and a second heat-generating element accommodating portion having a smaller heat value. Since the lower, rear, and upper portions of the first heat-generating element housing portion are surrounded by the air duct, heat generated from the first heat-generating element having a large amount of heat can be radiated intensively, and the heat radiation efficiency to the outside of the panel can be improved. By increasing the temperature, the rise in the temperature inside the panel can be suppressed, and the conventional heat exchanger can be eliminated. As a result, the dimensions of the housing can be reduced while securing the heat radiation outside the panel, and the entire control panel can be reduced in size.

Further, since the radiation fins are disposed in the lower and upper ducts, the radiation area of the housing can be increased, and the cooling fan for forcibly circulating the cooling air is disposed in the air duct. The heat exchange efficiency can be further increased, and an abnormal rise in the temperature inside the panel can be suppressed. Accordingly, it is possible to avoid a decrease in the amount of heat radiation when the surface area of the housing is reduced, and it is possible to further reduce the size.

In the present invention, the radiating fins are composed of outer fins located in the lower and upper ducts and inner fins located in the first and second heat generating element housings. And the circulation fan is arranged at the center of the fins in the panel. It is sucked into the center and agitated, and exhaled from the outer end. In this way, the air is discharged downward along the inner peripheral surface of the housing, moves downward to the center side, rises, and is discharged again by the circulation fan. In this way, the heat from the heating elements is radially and uniformly distributed outward, and the difference in temperature distribution in the panel can be reduced. Thus, the heat radiation efficiency of the heat generating element can be increased. As a result, the dimensions of the housing can be reduced,
The entire control panel can be downsized.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 4 are views for explaining a control panel cooling structure according to an embodiment of the present invention.
Is an overall perspective view of the control panel, FIG. 2 is a cross-sectional side view of a casing of the control panel, FIG. 3 is a plan view of the fins in the panel of the radiating fin as viewed from below the inside of the casing, and FIG. is there.

In FIG. 1, reference numeral 1 denotes a control panel provided on an NC machine tool (not shown), which controls driving of each drive motor, a hydraulic pump and the like incorporated in the machine main body. The control panel 1 has a schematic structure including a rectangular parallelepiped housing 2 having a door opening 2a on the front surface and a front door 3 for opening and closing the door opening 2a of the housing 2. The door opening 2a is airtightly closed. In addition,
3a is a breaker handle which engages with a main breaker in the panel when the door is closed, and 3b is a door hinge.

The inside of the housing 2 is vertically moved by partition walls 2b and 2c into a control device storage section 4, a power supply storage section (second heating element storage section) 5, and an amplifier storage section (first heating element storage section) 6 from the bottom. Are divided into Various control devices (not shown) are housed and arranged in the control device housing 6, and a transformer (not shown) as a second heating element is provided in the power supply housing 5.
The reactor, main breaker, contactor, etc. are housed and arranged.

An amplifier 15 as a first heating element is housed in the amplifier housing 6. The amplifier 15 includes a spindle amplifier, a power supply module, and the like.
7 is connected and fixed. This radiation fin 1
Reference numeral 7 denotes a structure in which a large number of fin plates 17b extending in the vertical direction are integrally formed on both surfaces of a base portion 17a having a T-shape in a plan view and fixed to the amplifier case 16 at intervals.

The housing 2 has an air duct section 20 formed therein. The air duct section 20 includes a lower duct section 21 formed between the power supply storage section 5 and the amplifier storage section 6, and a rear end of the lower duct section 21 and a rear end of the amplifier storage section 6. The rear duct portion 22 formed to be located on the side, and the upper duct portion 2 formed to be located above the amplifier housing portion 6 following the upper end of the rear duct portion 22
3 is connected substantially airtightly.

The air duct section 20 is formed in a U shape so as to surround the amplifier housing section 6 in a side view, and is formed over the entire width of the amplifier housing section 6.

The lower duct portion 21 has an air passage formed by an upper partition 2c 'and a lower partition 2c "constituting the partition 2c. An air inlet 3e is formed in a portion facing the front end opening 21a, and when the front door 3 is closed, the air inlet 3e and the front end opening 21a communicate with each other in an airtight manner.

At the air inlet 3e in the front door 3, a filter 24 for filtering the sucked air is provided.
The air inlet 3e can be opened and closed by a lid 3d provided with a number of slits 3c. By opening the lid 3d, the filter 24 can be replaced with the front door 3 closed. And maintenance can be facilitated.

The rear duct portion 22 is provided on the back plate 2 of the housing 2.
f, and an air passage formed by the rear wall 6a of the amplifier housing portion 6.
The radiation fins 17 are formed in the openings 6 formed in the rear wall 6a.
b is inserted and stored.

The upper duct section 23 is provided on the upper wall 6d of the amplifier housing section 6 with a box-shaped top plate member 2g constituting the ceiling of the housing 2.
Have an air passage formed by arranging them. Front end opening 23 of upper duct portion 23 of front door 3
An air discharge port 3g is formed in a portion facing a. The cross-sectional area of the lower and upper duct portions 21 and 23 is set smaller than the cross-sectional area of the rear duct portion 22, thereby increasing the flow velocity of the air passing through the lower and upper duct portions 21 and 23 to cool the air. Is increasing the character.

A cooling fan 30 is disposed above the heat radiation fins 17 on the downstream side of the rear duct portion 22. The cooling fan 30 sucks air from the air suction port 3e, circulates through the air duct section 20, and discharges the air from the air discharge port 3g.

The lower duct 21 and the upper duct 2
Radiation fins 25 and 26 are provided on 3. The radiating fins 25 and 26 have an inner fin 27b formed on the lower surface of the partition plate 27a, and an outer fin 27b formed on the upper surface.
This is a structure in which c is formed.

The upper radiation fin 26 is provided with a fin 27 inside the panel.
b is located in the amplifier housing 6 and the fins 27c outside the panel
Are arranged in the upper duct portion 23, and are supported by fixing a partition plate 27a to a peripheral edge of a fin opening 35 formed in the upper wall 6d. The outer fins 27c extend in the direction of air flow and are arranged at predetermined intervals in the width direction.

The lower radiating fins 25 are arranged such that the fins 27b inside the panel are located in the power supply housing 5 and the fins 27 outside the panel.
c is disposed in the lower duct portion 21 and is supported by fixing a partition plate 27a to a peripheral edge of a fin opening 35 formed in the lower partition 2c #.

The inner fins 27b are arranged at predetermined angular intervals so as to extend radially outward from the center of the partition plate 27a.
The outer end portion 27b ′ of the right side of FIG. Circulating fans 31, 32 are provided at the center of the partition plate 27a.
The in-panel fans 31, 32 are directly fixed to the partition plate 27a with long screws so as to sandwich the in-panel fins 27b. This makes the circulation fan 3
The air sucked in by the first and the second 32 passes between the fins 27b in the panel, is guided to the outer end 27b ', and is discharged therefrom. And the outer end 27 of each fin 27b in the panel
Since b 'is located over the entire inner circumference of the housing 2,
The air discharged from each outer end portion 27b 'flows downward while being uniformly distributed along the entire inner periphery of the housing 2, flows inward from here, and rises to the circulation fans 31, 32. It is aspirated (see dashed arrows in FIG. 2).

Next, the operation and effect of this embodiment will be described.

The control panel 1 of this embodiment includes a cooling fan 30
Sucks air into the lower duct portion 21 from the air inlet 3 e of the front door 3. This air flows into the rear duct portion 22 while absorbing the heat of the power supply portion via the outer fins 27 c in the lower duct portion 21, and flows through the radiation fins 17 in the rear duct portion 22. To absorb the heat of the amplifier 15. The cooling fan 30 sucks the air in the rear duct portion 22 and discharges the air into the upper duct portion 23, and the discharged air absorbs the heat of the amplifier portion through the outside fins 27 c in the upper duct portion 23. The air is discharged forward from the air discharge port 3g (see the solid arrow in FIG. 2).

The circulating fans 31, 32 suck heat inside the power supply housing 5 and the amplifier housing 6 and discharge the sucked air from the outer end 27b 'through the space between the fins 27b. The collected air flows downward while being evenly distributed along the entire inner periphery of the housing 2, flows inward from here, and then rises and circulates. In this way, the temperature inside the panel is kept at a predetermined temperature or less, for example, at plus 10 degrees below the temperature outside the panel.

As described above, according to the present embodiment, the inside of the housing 2 is divided into the control equipment storage section 4, the power supply storage section 5, and the amplifier storage section 6 in this order from the bottom, and the amplifier storage section 6 is separated by the air duct section 20. Since the lower duct portion 21 of the air duct portion 20 is disposed between the amplifier housing portion 6 and the power supply housing portion 5, the heat of the amplifier 15 having a large calorific value can be radiated intensively. The heat of the power supply unit can be radiated through the lower duct unit 21. This allows
The heat radiation efficiency to the outside of the panel can be increased, and the conventional heat exchanger can be eliminated. As a result, the dimensions of the housing 2 can be reduced while securing the heat radiation outside the panel, and the entire control panel can be reduced in size.

The radiating fins 1 are provided in the air duct section 20.
Since the cooling fans 30 for forcibly circulating the air are arranged in addition to the arrangement of the cooling fans 7, 25, and 26, the heat exchange rate can be increased and the rise in the temperature inside the panel can be suppressed. Thus, it is possible to avoid a decrease in the amount of heat radiation when the surface area of the housing 2 is reduced, and it is possible to further reduce the size.

In this embodiment, the radiation fins 25, 2
6 is composed of the outer fins 27c located in the lower and upper duct portions 21 and 23, and the inner fins 27b located in the power supply storage portion 5 and the amplifier storage portion 6, so that the heat exchange efficiency is further improved. be able to.

In the present embodiment, the above-mentioned fins 27b in each panel
Are arranged so as to extend radially outward from the center of the partition plate 27a, and the outer ends 27b 'are located on the entire inner peripheral surface of the housing 2, and the circulation fans 31, 32, the heat generated from the power source, the amplifier 15 and the like having a large amount of heat is distributed and distributed uniformly along the fins 27b in each panel by the circulation fans 31 and 32, and the temperature difference in the panel. Can be reduced. In this manner, the heat radiation efficiency of the power supply, the amplifier 15, and the like can be increased, the size of the housing can be reduced, and the entire control panel can be downsized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a control panel according to an embodiment of the present invention.

FIG. 2 is a sectional side view of a casing of the control panel.

FIG. 3 is a plan view of an in-panel fin of the radiation fin as viewed from below the inside of the housing.

FIG. 4 is a sectional front view of the radiation fin.

FIG. 5 is a schematic view of a control panel provided with a conventional heat exchanger.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 control panel 2 housing 5 power supply storage section (second heat generation element storage section) 6 amplifier storage section (first heat generation element storage section) 15 amplifier (first heat generation element) 20 air duct section 21 lower duct section 22 rear duct Part 23 upper duct part 25, 26 radiating fin 27b inner fin 27c outer fin 30 cooling fan 31, 32 internal fan

Claims (1)

[Claims] 1. A cooling structure for discharging heat from the heat-generating elements of a substantially hermetically-closed control panel in which heat-generating elements such as an amplifier and a power supply are housed and arranged in a housing. A first heat-generating element accommodating portion for accommodating a large first heat-generating element and a second heat-generating element accommodating portion for accommodating a second heat-generating element having a smaller heating value than the first heat generating element; A lower duct located on the body between the first and second heating element housings; a rear duct located on the rear side of the first heating element housing following the lower duct; An air duct portion is formed by connecting the upper duct portion located above the first heat generating element storage portion following the rear duct portion, and the air duct portion is sucked into the air duct portion from the air suction port of the lower duct portion. Allows air to flow through the air duct to discharge air from the upper duct. A cooling fan to be exhausted from a mouth, a radiating fin disposed at least in the upper duct portion, the radiating fin being located in the upper duct portion and an outer fin located in the first heat generating element storage portion. A control fin provided with an inner fin, wherein the fin in the panel is radially extended outward from the center, and a circulation fan is provided in the center of the fin in the panel. Cooling structure.