JP4324312B2 - Control panel cooling structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control panel in which an amplifier, a power source, and the like as heat generating elements are housed in a housing, and more specifically, heat generated from the amplifier, power source, etc. is dissipated outside the panel and The present invention relates to a cooling structure that is uniformly dispersed.
[0002]
[Prior art]
For example, NC machine tools are provided with a control panel that drives and controls various drive motors, hydraulic pumps, and the like. This type of control panel contains heat generating devices and heat generating parts such as spindle amplifiers, power supply modules, transformers, reactors, etc., so the heat generated from these is dissipated outside the panel to cause abnormal temperatures inside the panel. A heat exchanger that suppresses the rise may be provided.
[0003]
When arranging such a heat exchanger in the panel, it is difficult to install it inside the casing because of the location of the heat generating devices, the heat generating components, or the wiring. As shown, it is common to attach the heat exchanger 52 to the door 51 of the housing 50 (see, for example, Japanese Patent No. 2876583).
[0004]
The heat exchanger 52 draws cooling air outside the board by the outside fan 53 and discharges it from the lower end port 54 to the outside of the board. When the inside air sucked by the inside fan 55 is discharged from the upper end port 56, the heat sink 57 It is designed to cool through.
[0005]
[Problems to be solved by the invention]
However, when the heat exchanger is attached to the door as in the prior art, there is a problem that the depth of the door is increased by the amount of the heat exchanger and the control panel is enlarged.
[0006]
In addition, when the air in the panel is sucked from the lower end portion and radiated after the heat is discharged from the upper end portion as in the conventional case, there is only an air flow near the outlet, and the entire area in the panel is stirred. As a result, there is a problem that the temperature difference between the high temperature portion and the low temperature portion in the panel becomes large.
[0007]
The present invention has been made in view of the above-described conventional situation, and provides a cooling structure for a control panel that can reduce the size of the chassis while ensuring the amount of heat released to the outside of the panel and can eliminate the temperature difference in the panel. The purpose is to do.
[0008]
[Means for Solving the Problems]
The present invention provides a cooling structure that discharges heat from the heat generating element of a substantially hermetic control panel in which a heat generating element such as an amplifier and a power supply is housed and disposed in the housing to generate a large amount of heat in the housing. The housing is divided vertically into a first heat generating element storage portion in which the first heat generating element is stored and a second heat generating element storage portion in which the second heat generating element having a smaller heat generation amount than the first heat generating element is stored. A lower duct portion positioned between the first and second heat generating element storage portions, a rear duct portion positioned on the rear side of the first heat generating element storage portion following the lower duct portion, and the rear An air duct part is formed by connecting the upper duct part positioned above the first heat generating element storage part following the side duct part, and the air sucked into the air duct part from the air suction port of the lower duct part Circulates in the air duct part and the air outlet of the upper duct part A cooling fan to be discharged from the housing, and at least the radiating fin is disposed in the upper duct portion, and the radiating fin is located in the upper duct portion and in the panel located in the first heating element storage portion. The board fins are further provided, and the fins in the panel are arranged so as to extend radially outward from the center part, and a circulation fan is arranged in the center part of the fins in the board.
[0009]
[Effects of the invention]
According to the cooling structure of the control panel according to the present invention, the inside of the casing is divided into a first heat generating element storage section with a large heat generation amount and a second heat generation element storage section with a smaller heat generation amount, and the first heat generation is divided. Since the lower, rear and upper parts of the element storage part are enclosed by the air duct part, the heat generated from the first heat generating element with a large amount of heat can be radiated in a concentrated manner, and the heat radiation efficiency to the outside of the panel can be improved. Therefore, the conventional heat exchanger can be made unnecessary. As a result, the size of the housing can be reduced while ensuring the amount of heat released to the outside of the panel, and the entire control panel can be miniaturized.
[0010]
In addition, since heat radiation fins are arranged in the lower and upper duct parts, the heat radiation area of the housing can be increased, and a cooling fan for forcibly circulating cooling air is arranged in the air duct part. 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 to further reduce the size.
[0011]
In the present invention, the heat dissipating fin is composed of a fin outside the board located in the lower and upper duct parts and a fin inside the board located in the first and second heat generating element storage parts. Since the circulation fan is arranged at the center of the fin in the panel, the air heated by sucking heat from the heat generating element is placed in the center of the fin in the panel by the circulation fan. It is sucked in, stirred, and discharged from the outer end. In this way, air is discharged downward along the inner peripheral surface of the housing, moves upward toward the center side, rises, and is discharged again by the circulation fan. In this way, the heat from the heating element is uniformly distributed radially outward, and the temperature distribution difference in the panel can be reduced. Thus, the heat dissipation efficiency of the heat generating element can be increased. As a result, the dimensions of the housing can be reduced, and the entire control panel can be miniaturized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
1 to 4 are views for explaining a cooling structure of a control panel according to an embodiment of the present invention. FIG. 1 is an overall perspective view of the control panel, and FIG. 2 is a sectional side view of a casing of the control panel. 3 is a plan view of the fins in the panel of the radiating fin as viewed from the lower side in the housing, and FIG. 4 is a sectional front view of the radiating fin.
[0014]
In the figure, reference numeral 1 denotes a control panel provided in 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 2 a on the front surface and a front door 3 that opens and closes the door opening 2 a of the housing 2. The door opening 2a is airtightly closed. In addition, 3a is a breaker handle which engages with the main breaker in the panel when the door is closed, and 3b is a door hinge.
[0015]
The inside of the housing 2 is divided into a top and bottom by a partition wall 2b and 2c from the bottom into a control device storage unit 4, a power storage unit (second heating element storage unit) 5, and an amplifier storage unit (first heating element storage unit) 6. ing. Various control devices (not shown) are housed and arranged in the control device housing 6, and a transformer, a reactor, a main breaker, a contactor, etc. (not shown) as second heat generating elements are housed in the power supply housing 5. Has been placed.
[0016]
An amplifier 15 as a first heat generating element is accommodated in the amplifier accommodating portion 6. The 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 structure in which a large number of fin plates 17b extending in the vertical direction are integrally formed on both surfaces of a T-shaped base portion 17a fixed to the amplifier case 16 at intervals.
[0017]
An air duct portion 20 is formed in the casing 2. The air duct portion 20 includes a lower duct portion 21 formed so as to be positioned between the power supply accommodating portion 5 and the amplifier accommodating portion 6, and a rear end of the lower duct portion 21, followed by the rear of the amplifier accommodating portion 6. The rear duct part 22 formed so as to be located on the side and the upper duct part 23 formed so as to be located on the upper side of the amplifier housing part 6 following the upper end of the rear duct part 22 are connected in a substantially airtight manner. Configured.
[0018]
The air duct portion 20 is formed in a U shape so as to surround the amplifier housing portion 6 in a side view, and is formed over the entire width of the amplifier housing portion 6.
[0019]
The lower duct portion 21 has an air passage formed by an upper partition wall 2c ′ and a lower partition wall 2c ″ constituting the partition wall 2c. A front end opening 21a of the lower duct portion 21 of the front door 3 is provided. An air suction port 3e is formed at a portion facing the front, and the air suction port 3e and the front end opening 21a communicate with each other in an airtight manner when the front door 3 is closed.
[0020]
A filter 24 for filtering the intake air is disposed at the air intake port 3e in the front door 3. The air inlet 3e can be opened and closed by a lid 3d provided with a large number of slits 3c. By opening the lid 3d, the filter 24 can be replaced while the front door 3 is closed. Can be maintained easily.
[0021]
The rear duct portion 22 has an air passage formed by the back plate 2 f of the housing 2 and the rear wall 6 a of the amplifier storage portion 6. In the rear duct 22, heat dissipation of the amplifier 15 is performed. The fins 17 are housed and disposed through the openings 6b formed in the rear wall 6a.
[0022]
The upper duct portion 23 has an air passage formed by disposing a box-shaped top plate member 2g constituting the ceiling portion of the housing 2 on the upper wall 6d of the amplifier accommodating portion 6. An air discharge port 3g is formed at a portion of the front door 3 facing the front end opening 23a of the upper duct portion 23. Further, the cross-sectional area of the lower and upper duct parts 21 and 23 is set smaller than the cross-sectional area of the rear duct part 22, thereby cooling by increasing the flow velocity of air passing through the lower and upper duct parts 21 and 23. Increases sex.
[0023]
A cooling fan 30 is disposed above the heat dissipating 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 portion 20, and discharges it from the air discharge port 3g.
[0024]
Radiating fins 25 and 26 are disposed in the lower duct portion 21 and the upper duct portion 23. The heat dissipating fins 25 and 26 have a structure in which an inner fin 27b is formed on the lower surface of the partition plate 27a and an outer fin 27c is formed on the upper surface.
[0025]
The upper radiating fins 26 are arranged such that the in-panel fins 27b are located in the amplifier housing part 6 and the out-of-board fins 27c are located in the upper duct part 23, and are fins formed on the upper wall 6d. It is supported by fixing a partition plate 27 a to the periphery of the opening 35. Each of the outer fins 27c extends in the air flow direction and is arranged at a predetermined interval in the width direction.
[0026]
The lower radiating fins 25 are arranged such that the in-panel fins 27b are located in the power storage part 5 and the out-board fins 27c are located in the lower duct part 21. The partition plate 27a is fixed to the periphery of the formed fin opening 35 to be supported.
[0027]
The inner fins 27b are arranged at predetermined angular intervals so as to extend radially outward from the center of the partition plate 27a, and the outer end portions 27b ′ of the inner fins 27b are formed on the casing 2. It is close to the inner wall. Circulating fans 31 and 32 are inserted and arranged at the center of the partition plate 27a, and the fans 31 and 32 in the panel are directly fixed to the partition plate 27a with long screws so as to sandwich the fins 27b in the panel. Yes. As a result, the air sucked in by the circulation fans 31 and 32 is guided to the outer end portion 27b 'through the inter-panel fins 27b and discharged from here. Since the outer end portions 27b 'of the fins 27b in each panel are located over the entire inner periphery of the casing 2, the air discharged from each outer end portion 27b' is distributed over the entire inner periphery of the casing 2. It flows downward while being evenly distributed along the line, flows inwardly from here, and then rises and is sucked into the circulation fans 31 and 32 (see broken line arrows in FIG. 2).
[0028]
Next, the effect of this embodiment is demonstrated.
[0029]
In the control panel 1 of the present embodiment, the cooling fan 30 sucks air into the lower duct portion 21 from the air suction port 3 e of the front door 3. This air flows into the rear duct part 22 while absorbing heat from the power supply part through the outer fins 27 c in the lower duct part 21, and passes through the radiation fins 17 in the rear duct part 22. The heat of the amplifier 15 is absorbed. The cooling fan 30 sucks air in the rear duct portion 22 and discharges it to the upper duct portion 23. The discharged air absorbs heat of the amplifier portion in the upper duct portion 23 via the outside panel fins 27c. The air is discharged forward from the air discharge port 3g (see the solid line arrow in FIG. 2).
[0030]
In addition, the circulation fans 31 and 32 suck the heat in the panel of the power storage unit 5 and the amplifier storage unit 6 and discharge the sucked air from the outer end part 27b 'through the fins 27b in each panel. Flows downward while being evenly distributed along the entire inner circumference of the housing 2, and then flows inward from here to rise and circulate. In this way, the temperature inside the panel is maintained at a predetermined temperature or lower, for example, +10 degrees or lower of the outside temperature.
[0031]
As described above, according to the present embodiment, the housing 2 is divided into the control device storage unit 4, the power storage unit 5, and the amplifier storage unit 6 in order from the bottom, and the amplifier storage unit 6 is surrounded by the air duct unit 20, Since the lower duct portion 21 of the air duct portion 20 is disposed between the amplifier storage portion 6 and the power supply storage portion 5, the heat of the amplifier 15 having a large calorific value can be radiated intensively, and the power supply portion Heat can be dissipated through the lower duct portion 21. Thereby, the heat dissipation efficiency to the exterior of a board can be improved and the conventional heat exchanger can be made unnecessary. As a result, it is possible to reduce the size of the housing 2 while ensuring the amount of heat released to the outside of the panel, and to reduce the size of the entire control panel.
[0032]
Further, since the heat dissipating fins 17, 25, and 26 are disposed in the air duct portion 20 and the cooling fan 30 that forcibly circulates the air, the heat exchange rate can be increased and an increase in the temperature in the panel is suppressed. be able to. Accordingly, it is possible to avoid a decrease in the amount of heat radiation when the surface area of the housing 2 is reduced, and further miniaturization can be achieved.
[0033]
In the present embodiment, the radiating fins 25 and 26 are arranged from the outside fins 27 c located in the lower and upper duct parts 21 and 23, and the inside fins 27 b located in the power supply accommodation part 5 and the amplifier accommodation part 6. Since it comprised, the heat exchange efficiency can further be improved.
[0034]
In this embodiment, the 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 positioned on the entire inner peripheral surface of the casing 2, Since the circulation fans 31 and 32 are arranged in the center of the inner fin 27b, the heat generated from the power source, the amplifier 15 and the like having a large amount of heat is uniformly distributed along the inner fins 27b by the circulation fans 31 and 32. The temperature difference in the panel can be reduced. In this way, the heat radiation efficiency of the power supply, the amplifier 15 and the like can be increased, the dimensions of the housing can be reduced, and the entire control panel can be reduced in size.
[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 cross-sectional side view of the casing of the control panel.
FIG. 3 is a plan view of the fins in the panel of the heat radiating fins as viewed from below in the housing.
FIG. 4 is a cross-sectional front view of the radiating fin.
FIG. 5 is a schematic view of a control panel equipped with a conventional heat exchanger.
[Explanation of symbols]
1 Control Panel 2 Case 5 Power Supply Storage Unit (Second Heating Element Storage Unit)
6 Amplifier housing (first heating element housing)
15 Amplifier (first heating element)
20 Air duct portion 21 Lower duct portion 22 Rear duct portion 23 Upper duct portions 25 and 26 Radiating fins 27b Fins in the board 27c Fins outside the board 30 Cooling fans 31 and 32 Fans in the board

Claims (1)

A cooling structure that discharges heat from the heat generating element of a substantially hermetic control panel in which a heat generating element such as an amplifier and a power source is housed and disposed in the housing. The first heat generating element that generates a large amount of heat in the housing. Is divided into a first heat generation element storage section in which the first heat generation element is stored and a second heat generation element storage section in which the second heat generation element having a smaller heat generation amount than the first heat generation element is stored. , A lower duct portion positioned between the second heat generating element storage portions, a rear duct portion positioned on the rear side of the first heat generating element storage portions following the lower duct portion, and a rear duct portion Subsequently, an air duct part formed by communicating with an upper duct part located on the upper side of the first heat generating element storage part is formed, and the air sucked from the air suction port of the lower duct part into the air duct part. Discharge from the air outlet of the upper duct A cooling fan is disposed, and a radiation fin is disposed at least in the upper duct portion. The fin outside the panel located in the upper duct portion and the fin in the panel located in the first heating element storage portion. A cooling structure for a control panel, further comprising: a fin in the panel that is arranged so as to extend radially outward from the central part, and a circulation fan is disposed in the central part of the fin in the panel.

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