JP2001358487A - Cooler for control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler for a control panel which can prevent the short circuit flow of cooling air in the case of partly stopping the operation of a cooling fan while contriving the enhancement of cooling efficiency and the reduction of power consumption. SOLUTION: In a cooler for a control panel, an amplifier 15 as a heating element is stored in a casing 2 in roughly sealed condition, also an air duct 22 having an air suction port 21a and an air discharge port 23a is arranged to surround the above amplifier 15, and cooling fans for circulating the air sucked from the above air suction port 21a and discharging it from the above air discharge port 23a are arranged in the above air duct 22. The four units of cooling fans 30a-30d are arranged in parallel within the above duct 22, and this cooler is equipped with a cooling fan operation control means for changing the number of units in operation out of the above cooling fans 30a-30d according to the in-panel temperature within the above casing 2, and opening and closing valves (cooling air checking means) 40a-40d for hindering the cooling air blown out of the cooling fans 30b and 30c in operation from flowing into the cooling fans 30a and 30d in operation stoppage.

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 source and the like as a heating element are housed in a substantially hermetically sealed housing. More specifically, the control panel uses a cooling fan to generate heat from the heating element. The present invention relates to a cooling device that is discharged outside.

[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 accommodates heating elements such as spindle amplifiers, power supply modules, transformers, and reactors. By discharging the heat generated from these elements to the outside of the panel, abnormal temperature rise in the panel is suppressed. A cooling device is provided.

As such a cooling device, for example, FIG.
As shown in FIG. 2, an air duct 52 is provided so as to surround the lower side, the rear side, and the upper side of the amplifier 51 housed in a substantially sealed housing 50, and the amplifier 51 is provided in the air duct 52.
Of the air duct 52 is inserted and arranged.
The cooling fan 53 is disposed downstream of the radiating fin 51a. Then, the cooling fan 53 sucks air from the air suction port 52a of the air duct 52, and the air is discharged to the outside from the air discharge port 52b while absorbing the heat of the amplifier 51 via the radiation fins 51a.

In order to reduce the power consumption while increasing the cooling efficiency of the control panel, a plurality of cooling fans are arranged and the number of operating cooling fans is controlled according to the temperature inside the panel in the housing. It is effective. For example, as shown in FIG. 8, four cooling fans 55a, 55b, 55c, and 55d are arranged in parallel in the air duct 52, and when the temperature in the panel is higher than a set value, all the cooling fans 55a to 55d are arranged.
When the temperature inside the panel is lower than the set value, only the middle two central cooling fans 55b and 55c are operated, and the operation of both outer cooling fans 55a and 55d is stopped. It is possible to do.

[0005]

However, when the cooling fan is thinned out according to the temperature in the panel as described above,
As indicated by the mark → in FIG.
There is a concern that the cooling air blown out from the cooling fan 55c is sucked into the suction port side through the gap between the cooling fans 55a and 55d whose operation is stopped (short-circuit flow), and the cooling efficiency is deteriorated. You.

[0006] The present invention has been made in view of the above circumstances, while improving cooling efficiency and reducing power consumption.
It is an object of the present invention to provide a control panel cooling device that can prevent a short-circuit flow of cooling air when the operation of a cooling fan is partially stopped.

[0007]

According to a first aspect of the present invention, a heating element such as an amplifier and a power supply is housed in a substantially hermetically sealed housing, and an air duct having an air suction port and an air discharge port is provided with the heating element. In a cooling device for a control panel, which is disposed so as to surround the air duct, the cooling fan that distributes air sucked from the air suction port into the air duct and discharges the air from the air discharge port, a plurality of the cooling fans are disposed. Cooling fan operation control means for changing the number of operating cooling fans according to the temperature in the panel in the housing; and cooling air blown from the operating cooling fan flowing into the stopped cooling fan. And cooling air inflow prevention means for preventing the inflow of cooling air.

According to a second aspect of the present invention, in the first aspect, the cooling air inflow preventing means comprises at least an on-off valve disposed at a cooling air outlet of a cooling fan for stopping operation which is set in advance. Is characterized in that the cooling air outlet is closed by its own weight while the operation is stopped, and the cooling air outlet is opened by the blown wind during the operation.

[0009]

According to the cooling device of the present invention,
A plurality of cooling fans are arranged in the air duct, and the number of operating cooling fans is controlled according to the temperature in the panel in the housing.For example, when the temperature in the panel is higher than the set value, all the cooling fans are It is possible to reduce the power consumption by operating the vehicle and partially stopping the operation when the operation is lower than the set value.

In the present invention, when the cooling fan is thinned out, the cooling air blown from the operating cooling fan is prevented from flowing into the stopped cooling fan. Can prevent short-circuit flow of air due to suction of air, and can avoid deterioration of cooling efficiency.

According to the second aspect of the present invention, an on-off valve is provided at a cooling air outlet of the cooling fan for stopping operation, the cooling air outlet is closed by the weight of the on-off valve during operation stop, and cooling is performed by blowing wind during operation. Since the air outlet is opened, the cooling air inflow prevention means can be configured with a simple structure without increasing the number of parts so much, and an increase in cost can be suppressed.

[0012]

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

FIGS. 1 to 7 are views for explaining a control panel cooling device according to an embodiment of the present invention.
Is a perspective view of a control panel provided with a cooling device, FIG. 2 is a schematic perspective view of a casing of the control panel, FIG. 3 is a sectional front view of an air discharge port of the cooling device, and FIG. 4 is an air duct portion of the cooling device. Exploded perspective view of FIG. 5, FIG. 5 is a cross-sectional side view of the air duct portion of the cooling device,
6 and 7 are a sectional side view and a sectional front view of an on-off valve portion of the cooling device.

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, hydraulic pump and the like incorporated in the machine 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,
Reference numeral 3a denotes a breaker handle which engages with a shaft of a main breaker (not shown) in the panel when the front door 3 is closed. 3b is a door hinge.

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

An amplifier 15 as a heating element is housed in the amplifier housing 6. This amplifier 15
Is composed of a spindle amplifier, a power supply module and the like, and has a structure in which a radiation fin 17 is connected and fixed to the rear wall of the amplifier case 16. The heat dissipating fins 17 have a large number of fin plates 17 b extending vertically on both surfaces of a base portion 17 a having a T-shape in plan view fixed to the amplifier case 16.
Are integrally formed at intervals.

The housing 2 is provided with an air duct 20 which forms a part of the cooling device. 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. A rear duct portion 22 formed so as to be located on the side and an upper duct portion 23 formed so as to be located above the amplifier housing 6 following the upper end of the rear duct portion 22 are connected in a substantially airtight manner. It is configured.

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, so that the air inlet 3e and the front end opening 21a communicate with each other in an airtight manner when the front door 3 is closed. A filter 24 for filtering sucked air is provided in an air suction port 3e inside the filter 3. The air suction port 3e can be opened and closed by a lid 3d provided with a number of slits 3c. By opening the front door 3, the filter 24 can be replaced while the front door 3 is 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 23 is provided with the amplifier housing 6.
Has an air passage formed by arranging a box-shaped top plate member 2g constituting the ceiling portion of the housing 2 on the upper wall 6d. An air discharge port 23a is provided at the front end of the upper duct portion 23. Is formed. The top plate member 2g protrudes upward from the upper end of the front door 3, thereby forming the air discharge port 23a.
Is exposed to the outside.

Radiation fins 25 and 26 are inserted and arranged in the lower duct portion 21 and the upper duct portion 23, respectively. The radiating fins 25 and 26 are formed by forming a large number of fins 27b on the one main surface side of the partition plate 27a at predetermined intervals in the width direction, and fins 27b on the other main surface.
This is a structure in which a number of outer fins 27c having a slightly longer length are formed at predetermined intervals in the width direction.

The in-panel fins 27b of each of the heat radiation fins 25 and 26 are arranged so as to be located in the amplifier housing 6, and the out-of-panel fins 27c are fin openings 35 formed in the upper partition 2c and the upper wall 6d. Through the lower and upper duct 2
It is arranged so that it may be located in 1 and 23. The partition plates 27a of the heat radiation fins 25 and 26 are engaged and fixed to the edges of the fin openings 35 of the upper partition 2c and the upper wall 6d.

The cross-sectional areas of the lower and upper duct portions 21 and 23 are set smaller than the cross-sectional area of the rear duct portion 22, and the cooling performance is improved by increasing the flow velocity of the air passing between the outer fins 27c. ing.

An in-panel fan 31 is provided between the lower inner fin 27b and the lower surface of the amplifier case 16, and a panel is provided between the upper inner fin 27b and the upper surface of the amplifier case 16. An inner fan 32 is provided. The in-panel fans 31 and 32 are for efficiently transferring the heat in the panel of the amplifier housing 6 to the fins 27b in the panel, and are directly inserted into the partition plate 27a with long screws so as to sandwich the fins 27b in the panel. Fixed.

In the vicinity of the upper side of the radiation fin 17 on the downstream side of the rear duct portion 22, four cooling fans 30a, 30
b, 30c, 30d are arranged in parallel in the width direction. The cooling fan 30a to 30d allows the air suction port 3
In this configuration, air is sucked from e, flows through the air duct section 20, and is discharged from the air discharge port 23a.

The cooling fans 30a to 30d are fixed to a common support plate 36, and the support plate 36 is fixed to the rear duct portion 22. The air passage of the rear duct 22 is substantially closed by the support plate 36, and only the cooling air outlet A and the cooling air inlet B of the cooling fans 30a to 30d are opened. A frame member 37 having a frame surrounding the cooling air outlet A of each of the cooling fans 30a to 30d is provided on the upper surface of the support plate 36.

Opening / closing valves 40a, 40b, 40c, and 40d as cooling air inflow preventing means are provided at the cooling air outlet A of each of the cooling fans 30a to 30d. The on-off valves 40a to 40d are made of a lightweight member such as resin, rubber, or aluminum, and are fastened and fixed to the rear edge 37a of the frame member 37 by screws 41.

A thin hinge portion 42 is formed by cutting out the fixed side base of each of the on-off valves 40a to 40d so that each of the on-off valves 40a to 40d has its own weight when the operation is stopped. Is closed, and during operation, the cooling air is blown up by the blowing air from the cooling fans 30a to 30d to open the cooling air outlet A.

Further, the cooling device according to the present embodiment has an in-panel temperature sensor (not shown) provided in the amplifier housing 6.
And a controller (not shown) as cooling fan operation control means for controlling the driving of each of the cooling fans 40a to 40d and the in-panel fans 31, 32 according to the temperature detected by the temperature sensor. When the temperature in the panel exceeds a set value, the controller controls four cooling fans 30a.
When the temperature in the panel is lower than the set value, only the central two cooling fans 30b and 30c are operated, and the operation of the cooling fans 30a and 30d on both outer sides is stopped.

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

The cooling device according to the present embodiment includes an amplifier housing 6
The temperature inside the panel is detected, and when the temperature inside the panel is higher than the set value, all four cooling fans 30a to 30d are operated. The on-off valves 40a to 40d are pushed up by the wind power from the cooling fans 30a to 30d to open the cooling air outlet A, and the outside air is sucked into the lower duct portion 21 from the air inlet 3e 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. Amplifier 1
Absorbs 5 heat. The cooling fan 30a to 30d sucks air in the rear duct portion 22 and blows out the air to the upper duct portion 23, and the blown air is
The heat is discharged from the air discharge port 23a to the front while absorbing the heat of the amplifier section through the external fins 27c in the inside 3 (see → solid line in FIG. 5).

The fans 31 and 32 in the panel circulate the heat in the panel of the amplifier housing 6 and radiate the heat through the radiating fins 25 and 26 (see the dotted line in FIG. 5).

When the temperature inside the panel falls below the set value, the operation of the cooling fans 30a and 30d on both outer sides is stopped. Then, both the on-off valves 40a and 40d close the cooling air outlet A by their own weight. In this case, the cooling air blown out from the cooling fans 30b and 30c during operation is discharged to the outside from the air discharge port 23a through the upper duct 23 while pressing the opening / closing valves 40a and 40d on both sides in the closing direction (FIG. 7 → mark).
As a result, the cooling air blown from the operating cooling fans 30b, 30c causes the stopped cooling fans 30a, 3
The cooling air is not sucked into the cooling air suction port B side through the gap of 0d and is smoothly discharged. In this way, the temperature inside the panel is kept at a predetermined temperature or lower, for example, at plus 10 degrees below the external temperature.

As described above, according to the present embodiment, the four cooling fans 30 a are provided in the rear duct 22 of the air duct section 22.
To 30d are arranged in parallel, and all the cooling fans 30a to 30d are arranged when the temperature in the panel of the amplifier housing 6 is higher than a set value.
, The heat of the amplifier 15 having a large heat value can be forcibly exhausted and cooled, and the cooling efficiency can be improved.

When the temperature is lower than the set value, the operation of the cooling fans 30a and 30d on both outer sides is stopped, so that power consumption can be reduced while cooling performance is secured.

In the present embodiment, each of the cooling fans 30a-3
Since the open / close valves 40a to 40d are disposed at the cooling air outlet A of 0d, the cooling air outlets A of the cooling fans 30a and 30d on the outer sides are connected to the open / close valves 40a and 40d during the thinning operation.
Blocked by the cooling fan 40d, the cooling air blown out of the cooling fans 30b, 30d during operation can be prevented from flowing into the cooling fans 30a, 30d stopped, thereby preventing short-circuit flow of air due to suction of the cooling air. It is possible to avoid deterioration of the cooling efficiency.

The on-off valves 40a to 40d close the cooling air outlet A by their own weight, and when the operation is resumed, open the cooling air outlet A by the blown air. Therefore, the cooling air outlet A has a simple structure with almost no increase in the number of parts. The inflow prevention means can be configured, and can be realized without significantly increasing the cost.

In the present embodiment, the inside of the housing 2 is divided into a control equipment storage section 4, a power supply storage section 5, and an amplifier storage section 6 in this order from the bottom, and the lower, rear, and upper sides of the amplifier storage section 6 are arranged. The air duct section 20 surrounds the air duct section 20.
Since the lower duct portion 21 is disposed between the amplifier housing portion 6 and the power supply housing portion 5, the amplifier 15 having a large calorific value can be intensively cooled, and the heat of the power supply portion is reduced by the lower duct portion. 21 can be dissipated.

In the above embodiment, each cooling fan 3
Although the case where the on-off valves 40a to 40d are arranged at 0a to 30d has been described, the on-off valves of the present invention are preset on both outer cooling fans 30 so as to be stopped during the thinning operation.
a, 30d.

In the above embodiment, the case where four cooling fans are arranged has been described. However, the present invention is not limited to this, and the number of arranged cooling fans is determined in accordance with the heat generation amount, the passage area of the air duct, and the like. Just set it. Further, in the above embodiment, the two cooling fans 30a, 30d
However, the present invention may be configured to appropriately stop the cooling fan between one and three units.

[Brief description of the drawings]

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

FIG. 2 is a schematic perspective view of a casing of the control panel.

FIG. 3 is a sectional front view of an air discharge port portion of the cooling device.

FIG. 4 is an exploded perspective view of an air duct part of the cooling device.

FIG. 5 is a sectional side view of an air duct portion of the cooling device.

FIG. 6 is a sectional side view of an on-off valve portion of the air duct unit.

FIG. 7 is a sectional front view of an on-off valve portion of the air duct unit.

FIG. 8 is a diagram showing a process of establishing the present invention.

FIG. 9 is a view showing a conventional general cooling device.

[Explanation of symbols]

 Reference Signs List 1 control panel 2 housing 15 amplifier (heating element) 20 air duct section 21a front end opening (air suction port) 23a air discharge port 30a to 30d cooling fan 40a to 40d opening / closing valve (cooling air inflow prevention means) A cooling air blowing port

Claims (2)

[Claims] 1. A heating element such as an amplifier and a power supply is housed in a substantially closed housing, and an air duct having an air suction port and an air discharge port is disposed so as to surround the heating element.
In a cooling device for a control panel, in which a cooling fan for distributing air sucked from the air suction port and discharging from the air discharge port in the air duct is provided, a plurality of the cooling fans are arranged, and a panel in the housing is provided. Cooling fan operation control means for changing the number of operating cooling fans according to the internal temperature, and cooling air inflow prevention for preventing cooling air blown from the operating cooling fan from flowing into the stopped cooling fan And a cooling device for a control panel. 2. The cooling air inflow prevention means according to claim 1, wherein said cooling air inflow prevention means comprises at least a switching valve provided at a cooling air outlet of a cooling fan for stopping operation which is set in advance. A cooling device for a control panel, wherein the cooling air outlet is closed by its own weight, and the cooling air outlet is opened by blowing wind during operation.