JP2768602B2 - control panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control panel of a machine tool such as an electric discharge machine and a laser machine, and more particularly to a cooling structure of the control panel.

[0002]

2. Description of the Related Art In general, a control panel of a machine tool such as an electric discharge machine or a laser beam machine has an operation section provided with a CRT, sheet keys and the like, and a control section containing an NC control unit, a servo amplifier and the like. It can be classified into a machining power supply unit in which a voltage DC unit, a switching unit, a resistor unit and the like are stored.

[0003] While each of the above-mentioned parts is constituted by a control panel housed in an integrated housing, it is often constituted by a plurality of control panels housed in separate housings. In each case, since the operation unit and the control unit are composed of a high-density mounting printed circuit board or the like, they are hermetically sealed in a dustproof manner, and the sealed area is indirectly cooled using a heat exchanger.

Further, the processing power supply section takes in air outside the control panel to reduce forced convection due to the lack of a high-density mounting printed circuit board and the economical reason that the amount of heat generated is so large that the cost required for cooling is increased. A direct cooling process to be performed has been performed. In general, the above-mentioned direct cooling process generally includes disposing an outside air intake port with a filter at a lower portion of a casing constituting a control panel, providing a plurality of cooling fans inside the casing, and exhausting the inside air to a casing ceiling plate. Forced air cooling was performed by arranging the mouth.

However, in recent years, with the advancement of machining current control and the like, the high density mounting of printed circuit boards in the machining power supply unit has further progressed, and as a result, the operation may be hindered by the entry of dust. Many units have been proposed that are hermetically sealed like a unit and a control unit, and the sealed area is indirectly cooled using a heat exchanger.

[0006] In addition, reference documents relating to the present invention are disclosed in Japanese Utility Model Laid-Open No. 61-111193, entitled "Heat dissipation housing for electronic device", and Japanese Utility Model Laid-Open No. 61-4492. "Electrical equipment", Heisei 2-263
No. 10 discloses a "distribution board cooling structure".

[0007]

The processing power supply unit in the above-mentioned conventional control panel is hermetically sealed in a dust-proof manner despite its extremely large heat value, and the sealed area is indirectly controlled by using a heat exchanger. Cooling, the heat transfer coefficient of the heat exchanger required for indirect air cooling is poor, the entire control panel becomes expensive, and hot spots are easily generated in the control panel, and uniform cooling processing is performed. There was a problem that it was not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to improve a heat transfer coefficient of a heat exchanger required for indirect air cooling in a processing power supply unit of a control panel.
It is another object of the present invention to provide a control panel in which the entire control panel can be configured at a low cost and that can uniformly cool without generating hot spots in the control panel.

[0009]

In order to achieve the above object, a control panel according to the present invention has a constant-voltage DC unit, a switching unit, and a number of electronic elements mounted in a dust-tight enclosure. In a control panel in which a control board or the like is stored and a heating element such as a power resistor is stored in a ventilable accessory box disposed on the ceiling outside the housing, on a ceiling outer surface below the heating element, A corrugated heat transfer plate in which groove-shaped flow passages whose upper and lower sides are opened alternately are arranged horizontally, and the lower surface of the heat transfer plate is closed except for a portion serving as a suction and exhaust port. A plurality of inside air-side rectangular flow paths are formed by sealing both ends of the groove-shaped flow path whose lower part is opened, and a fan case is disposed between the upper surface of the heat transfer plate and the heating element. The outside air side rectangular flow path is formed, and the inside of the ceiling of the housing is inside the control panel. An inside-air cooling fan that guides air to the inside-air-side rectangular flow path is provided, passes through the outside-air-side rectangular flow path from an intake port of the accessory box, and flows through the surroundings so as to forcibly air-cool the heating element. A cooling fan for discharging air to a flow path leading to an exhaust port of the accessory box is provided in the fan case, and exchanges heat through a heat transfer partition between the inside air side and outside air side rectangular flow paths.

[0010] In the control panel according to the next invention, the cooling fan disposed between the upper surface of the heat transfer plate and the heating element is mounted in a box-shaped case that is mounted to be drawn out via a rail. The box-shaped case is configured as an inclined surface such that case front and rear walls located at both ends in the longitudinal direction of the heat transfer plate spread upward from the bottom thereof.

In the control panel according to the next invention, a door provided at a front opening of the housing and a front surface of the accessory box are formed on the same surface, and abut on an upper end flange of the housing opening via a packing. A part of the inner bending flange of the door is cut out, the notch is filled with an elastic body, and a connection cable from the heating element and the cooling fan in the accessory box to the inside of the control panel is formed in the housing. It is sandwiched between the upper end flange of the body opening and the elastic body, is sealed in a dustproof manner, and is wired.

A control panel according to the next invention is a control panel in which a constant-voltage DC unit, a switching unit, a control board on which a number of electronic elements are mounted, and the like are housed in a dust-tight enclosure. A corrugated heat transfer plate having a length substantially equal to the depth between the front and rear surfaces of the casing and having an open upper and lower channel formed alternately is disposed horizontally. The heat transfer plate is mounted in a rectangular cylindrical case having both ends in contact with outside air intake ports formed in the front and rear surfaces of the housing. Are sealed to form a plurality of inside air side rectangular flow paths, and the outside air side rectangular flow path leading to the outside air intake port on the front and rear surfaces of the housing is formed by a groove-shaped flow path opened at the top. On the top of the square tubular case, a duct is provided on the exhaust port An opening connected to the housing and an inside air intake / exhaust port are formed on the lower surface, and the inside of the duct or the upper part thereof passes through the outside air intake port on the front and rear surfaces of the housing through the outside air side rectangular flow path, and the housing A cooling fan that discharges outside air to an exhaust port of the body ceiling is provided, and an inside-air cooling fan that guides air in the control panel to a inside-air-side rectangular flow path is provided on a lower surface of the rectangular cylindrical case. And heat exchange through a rectangular flow path partition on the outside air side.

[0013] In the control panel according to the next invention, an inside air intake port is formed in the longitudinal center of the lower surface of the rectangular cylindrical case, and an inside air exhaust port is formed in both front and rear ends in the longitudinal direction. At the same time, the air in the control panel is sent into the inside air side rectangular flow path by the inside air cooling fan disposed at the inside air intake port, and the air flow from the inside air exhaust port flows along the housing side wall. .

[0014]

The control panel according to the present invention has a groove-type flow opening at the upper and lower sides, which is disposed on the ceiling surface by the air flow on the suction side of the cooling fan for forcibly cooling the heating element mounted on the housing ceiling. The heat transfer plate having the passage is cooled, and the inside of the control panel is indirectly cooled by the heat exchange action of the heat transfer plate. Also,
Air flow pressure loss due to rapid shrinkage at the channel-shaped channel inlet opening above the heat transfer plate is reduced, the amount of intake air can be increased, and the heat transfer coefficient of the heat transfer plate is improved. Furthermore, the forced convection through the groove-shaped flow path in which the lower part of the heat transfer plate provided on the ceiling surface is opened and the forced air convection on the inside air of the separate heat exchanger provided on the side wall do not decelerate due to collision. Agitation of air in the control panel is promoted, and the generation of hot spots is prevented. Further, the heating element and the connection cable to the cooling fan provided outside the control panel housing can be easily wired through the cutout portion of the door, and the cutout portion is sealed in a dustproof manner by the elastic body.

Further, in the control panel according to the present invention, a heat transfer plate having rectangular channels on the inside air side and the outside air side can be arranged over substantially the entire depth of the control panel housing, so that the heat exchange capacity can be increased and the outside air side can be provided. Since outside air can be taken in from both ends of the rectangular flow passage, the amount of taken-in air can be increased and the heat transfer coefficient of the heat transfer plate is improved. In addition, short circuit circulation of air in the panel is prevented,
The occurrence of hot spots is prevented.

[0016]

Embodiment 1 FIG. 1 is a schematic longitudinal sectional view showing a cooling structure (Embodiment 1) in a control panel according to the present invention, and FIG. 2 is an enlarged view of a main part showing the cooling structure shown in FIG. , FIG. 3 is a cross-sectional view of FIG.
4 is a perspective view showing the structure of the fan case shown in FIG. 1, and FIG. 5 is a perspective view of a main part showing an upper end portion of the door shown in FIG. 1.

In FIG. 1, reference numeral 101 denotes a control panel constituting a machining power supply unit, 1 is its housing, 2 is a door provided at the front opening of the housing 1, and 3 is a ceiling plate of the housing 1. The front part facing the door 2 has a flange 3A bent in a U-shape. Reference numeral 4 denotes a bottom plate that forms the bottom of the housing 1, and reference numeral 103 denotes a constant-voltage DC unit mounted on the bottom plate 4. 5 is a horizontal frame fixed to the left and right side walls of the housing 1, 6 is a horizontal frame fixed to the rear wall of the housing, and 7 is a pair of upper and lower rails supported via the horizontal frames 5 and 6. A switching unit 104 is slidably housed between the rails.

Reference numeral 105 denotes a heat exchanger attached to the door 2, and a heat transfer plate 13 is housed in a box-shaped case 12. The heat transfer plate 13 forms an inside air-side rectangular flow path and an outside air-side rectangular flow path. The lower part stores an inside air suction fan 14 and the upper part stores an outside air suction fan 15. Naturally, exhaust ports are formed on the mounting surfaces of the fans 14 and 15, and the case 12 is provided with an inside air intake port 12D and the door 2 is provided with an outside air intake port 2A corresponding to them.

Reference numeral 16 denotes a heat transfer plate horizontally disposed on the outer surface of the ceiling plate 3. A thin plate is bent in a corrugated shape to form a groove-shaped passage 54 having an open lower part and a groove-shaped passage 55 having an open upper part. They are formed alternately. The above-mentioned channel-shaped channel 5 whose lower part is open
Sealing members 17 are provided inside the both ends of 4, and a mounting flange 17 </ b> A is formed around the heat transfer plate 13 integrally with the sealing members 17. Reference numeral 18 denotes a seal member filled with the seal member 17 as a backup member.

As described above, the channel-shaped channel 54 whose both ends are hermetically sealed and whose lower side is open is closed at the open lower side by the ceiling plate 3, and the inside air intake port 3 B and the inside air exhaust port of the ceiling plate 3. It communicates with the space in the housing 1 through 3C. Therefore, the channel 54 will hereinafter be referred to as an inside air side rectangular channel.

Further, the groove-shaped flow path 55 whose upper side is opened is closed by a fan unit 107 described later, so that the groove-shaped flow path 55 is hereinafter referred to as an outside air side rectangular flow path. An inside air push-in fan 21 is provided on the lower surface of the inside air intake port 3B via a mount 19. Mounting stand 1
9 is inserted into the support bracket 20 at the rear so that it can be easily attached and detached, and only the front is fixed with screws.

Reference numeral 8 denotes an accessory box disposed on the housing 1. An opening 8A is formed almost entirely on the front surface, and a slit-shaped intake port 8B is formed below the rear surface. A lid 9 is screwed to the front surface of the opening 8A, and a slit-shaped intake port 9A is formed below the lid 9 as well. An exhaust port 8C having a large area is formed on the upper surface of the accessory box 8, and an exhaust louver 10 is provided.

The accessory box 8 accommodates a plurality of power resistors 28 used for controlling the machining current, and is used for direct cooling by taking in air outside the control panel by a cooling fan 26. The resistance wire of the resistor 28 is insulated by filling with cement, has no filling exposed portion, and has excellent environmental resistance. Therefore, it is not necessary to house the resistor in a dust-tight enclosure. With this configuration, the amount of heat generated in the housing 1 can be reduced.

Reference numeral 22 denotes a pair of left and right rails, which are located at substantially the same height as the upper end of the heat transfer plate 16 and fixed to the side surface of the accessory box 8. The rail 22 has a U-shaped cross section, has a vertical portion 22A, an upper horizontal leg 22B, a lower horizontal leg 22C, and further has a front leg 22D at the tip. A fan unit 107 is slidably housed between the upper and lower horizontal legs 22B and 22C. 23 is the case, and FIG.
As shown in FIG. 3, the panel is composed of a pair of left and right side plates 24 and a panel 25. The side plate 24 has a vertical leg 24A, a horizontal leg 24B, and a fixed ear 24C, and is welded to the end face of the panel 25 at the horizontal leg 24B.

Reference numeral 25A denotes a bottom portion of the panel 25, and a plurality of intake ports 25B for the cooling fan 26 are formed. 25C is an inclined wall before and after the panel 25,
It is configured to spread upward from the bottom 25A,
A horizontal flange 25D is formed at the upper end. A mounting hole 25E for a connector 44 for electric wiring of the cooling fan 26 is formed in the front inclined wall 25C. The fan unit 107 in which the plurality of cooling fans 26 and the connectors 44 are assembled to the case 23 is inserted between a pair of left and right rails 22, and the fixed ear 24C is screwed to the front leg 22D.

Reference numeral 108 denotes an upper horizontal leg 22 of the rail 22.
A resistor unit slidably housed on B.
Reference numeral 27 denotes the case, which is formed in a frame shape having an open top surface having substantially the same outer shape as the plane of the fan unit 107. The plurality of resistors 28 are mounted via four horizontal bars 29 bridged between left and right side walls of the case 27, and are wired and connected to a connector 46 provided on a front wall of the case 27.

A falling portion 8D is formed on the left and right of the front edge of the exhaust port 8C of the accessory box 8, and a U-bend 8E is formed on the rear edge. On the other hand, a notch 27 is formed in the rear wall of the case 27 so that the lowered portion 8D can pass through the case 27 when it is taken in and out.
A is provided. In the resistor unit 108 inserted to the final mounting position, the front wall of the case 27 is screwed to the falling part 8D, and the upper end of the rear wall enters under the U-bend part 8E to restrict the vertical movement.

Reference numeral 43 denotes a cable that is wired and connected from the connector 44 of the fan unit 107 to the inside of the housing 1. A cable 45 is wired and connected from the connector 46 of the resistor unit 108 to the switching unit 104 in the housing 1. The cables 43 and 45 are attached to the flange 3A of the ceiling plate 3 while avoiding the heat exchanger 105 attached to the door 2 as shown in FIG.
Is tied to the cable support 47.

The inner bent flange at the upper end of the door 2 is provided with a cutout 2C for receiving the cables 43 and 45. Reference numeral 60 denotes a holding bracket in which an elastic body 61 such as urethane rubber is adhered to a U-shaped holding wall 60A, and is screwed to the upper surface of the door 2 using a flange 60B formed at an upper end of the holding wall 60A. The elastic body 61 is continuous with the packing 62 attached to the inner bending flange of the door 2,
When the is closed, it is elastically deformed so as to enclose the cables 43 and 45, and the periphery thereof is dustproofly sealed.

Further, the cables 43 and 45 can be pulled out of the housing 1 without passing through the through-holes, and the cables 43 and 45 can be easily wired because the accessibility to the cable support 47 is extremely good. The fan unit 107 and the resistor unit 10
When the connector 8 is pulled out, the connectors 44 and 46 can be pulled out so as to hang down, and the binder 48 does not need to be removed.

Next, the operation will be described. When the heat exchanger 105 is operated, the high-temperature air in the casing 1 is sucked from the inside air intake port 12D as shown by an arrow a, and the heat transfer plate 1
3 and is returned into the housing 1 by the inside air suction fan 14 again. On the other hand, the low-temperature air outside the control panel 101 is sucked from the outside air intake port 2A as shown by the arrow b, is diverted in the outside air side flow path of the heat transfer plate 13, and is returned to the outside of the control panel again by the outside air suction fan 15. . Due to the forced convection, heat exchange is performed via the heat transfer plate 13, and the air in the housing 1 is cooled.

However, since the constant voltage DC unit 103 and the switching unit 104 are power systems, they generate a large amount of heat, and in this embodiment, the heat transfer plate 16 provided on the ceiling plate 3 in this embodiment.
However, heat exchange is performed as described below.

By the operation of the inside air pushing fan 21,
The high-temperature air in the casing 1 is pushed into the inside-air-side rectangular flow path 54 of the heat transfer plate 16 as shown by an arrow c, flows therethrough, and is returned to the casing 1 again from the inside-air exhaust port 3C. On the other hand, by the operation of the cooling fan 26, low-temperature air outside the control panel 101 is sucked in from the front and rear intake ports 8 </ b> B and 9 </ b> A as indicated by an arrow d, and the inside of the outside air-side rectangular channel 55 is divided from the front and rear of the heat transfer plate 16. The cooling air flows into the cooling fan 26 and is then discharged into the resistor unit 108.

Thereafter, the gas flows through the periphery of the resistor 28 and is exhausted from the exhaust port 8C to the outside of the control panel. Thus, heat exchange is performed via the heat transfer plate 16 by the forced convection in the inside air side rectangular flow path 54 and the outside air side rectangular flow path 55, and the air in the housing 1 is cooled. That is, the heat transfer plate 16 functions as the heat exchanger 106 together with the inside air pushing fan 21 and the cooling fan 26. Further, the upper end of the outer periphery of the fan unit case 23 is almost in close contact with the lower end of the resistor unit case 27,
Since the case 27 functions as a duct leading to the exhaust port 8C, the airflow discharged from the cooling fan 26 has no airflow loss, and the resistor 28 is properly air-cooled.

From the front and rear of the heat transfer plate 16 to the outside air side rectangular flow path 55
The air flow that flows into the inside of the fan unit case 23 and the air flow that enters from the front and rear vertical surfaces of the heat transfer plate 16
And deflects obliquely downward, and merges with the airflow entering obliquely above the outside air side rectangular flow path 55. As a result, the air flow pressure loss due to rapid contraction at the entrance of the outside air-side rectangular flow path 55 is reduced, and the amount of intake air can be increased.

Further, the turbulence is promoted by the air flow entering obliquely from above, and a uniform air flow is obtained up to the deep portion of the outside air side rectangular flow path 55. Therefore, the heat transfer coefficient of the heat transfer plate 16 can be improved. (If the inclined wall 25C is a vertical wall, a sudden contraction in which the cross-sectional area becomes half occurs, and the loss coefficient ζ =
A pressure loss proportional to 0.24 occurs. In addition, the air flow is a non-uniform flow that is biased toward the shallow portion of the outside air-side rectangular channel 55 near the cooling fan 26).

The directions of the discharge air flow (arrow c) from the inside air exhaust port 3C of the heat transfer plate 16 and the suction air flow (arrow a) to the inside air intake port 12D of the heat exchanger 105 accelerate in substantially the same direction. It is configured as follows. Therefore, there is no deceleration or stagnation due to the collision of the air flow, the air agitation in the housing 1 is promoted, and the generation of hot spots can be prevented. Further, the impedance for the entire flow of air in the housing 1 can be reduced, and the cooling capacity of the heat exchangers 105 and 106 can be improved.

Embodiment 2 FIG. 6 is a schematic longitudinal sectional view showing a cooling structure (Embodiment 2) in a control panel according to the present invention. FIG. 7 is an enlarged view of a main part showing the cooling structure shown in FIG. FIG. 8 shows the VIII shown in FIG.
It is principal part sectional drawing of the -VIII line.

In the figure, reference numeral 102 denotes a control panel constituting a machining power supply unit, and reference numeral 1 denotes its housing. Reference numeral 2 denotes a door provided on the front and rear openings of the housing 1. Reference numeral 3 denotes a ceiling plate of the housing 1, which has a flange 3 </ b> A bent in a U-shape on front and rear surfaces facing the door 2. Reference numeral 4 denotes a bottom plate forming the bottom of the housing, and 103 denotes a constant-voltage DC unit mounted on the bottom plate 4. 5 is a horizontal frame fixed to the left and right side walls of the housing, and 7 is a pair of upper and lower rails supported via the horizontal frame 5. A switching unit 104 is slidably housed between the rails.

Reference numeral 109 denotes a heat exchanger horizontally disposed on the upper part of the housing 1, the details of which will be described below. Numeral 70 denotes a rectangular cylindrical case combining a lower case 71 and an upper case 72 each having a U-shaped cross section, and is supported by the horizontal frame 6. The rectangular tubular case 70 has a length substantially equal to the depth dimension of the housing 1, and includes a corrugated heat transfer plate 73 in which groove-shaped flow paths 54 and 55 having open lower and upper portions are formed alternately. Is stored. A lower bending flange 71A is provided at both ends of the lower case 71.
Are formed at the center, and a large outside air outlet 72A is formed in the front and rear portions.

Seal fittings 74 are disposed inside the two ends of the grooved flow path 54 whose lower part is open.
The seal member 75 is filled with 4 as a backup member. An outside air intake port 2D is formed in each of the front and rear doors 2, and a flange frame 76 is welded to the inner surface. A packing 63 is attached to the entire circumference of the flange frame 76. In the closed state of the door 2, both ends of the rectangular cylindrical case 70 and the flange frame 76 are in airtight contact with each other by the effect of the packing 63. As described above, the groove-shaped flow path 54 whose lower part is opened and the groove-shaped flow path 55 whose upper part is opened are air-tightly separated, and function as the inside air side rectangular flow path 54 and the outside air side rectangular flow path 55, respectively.

The inside air intake port 71B on the lower surface of the rectangular cylindrical case 70
In the same manner as in the first embodiment, the mounting table 19 and the support
The inside air push-in fan 21 is attached via the. Reference numeral 77 denotes a duct connecting the outside air exhaust port 72A on the upper surface of the square cylindrical case 70 and the square hole 3D of the ceiling plate 3. The duct 77 has an inner bending flange 77A and an outer bending flange 7 at both ends.
7B, and each is screwed so as to be in close contact with the rectangular cylindrical case 70 and the ceiling plate 3 via the packing 64 (see FIG. 8).

The duct 77 is connected to the fan unit 110
A drawer hole 77C is provided on the rear surface, and a rail 78 having a U-shaped cross section is fixed to the left and right inner surfaces. Reference numeral 79 denotes a shallow box-shaped fan panel to which a plurality of cooling fans 26 are attached, and which is inserted into a pair of left and right rails 78 through a drawer hole 77C. Reference numeral 80 denotes a lid having a packing 65 attached to the outer periphery. By screwing the lid 80, the drawer hole 77C is air-tightly closed.
The fan panel 79 is also held.

As shown in FIG. 8, the heat transfer plate 73 has a large number of partition walls 73A formed at equal intervals, and the upper and lower walls thereof are alternately connected by bridging portions 73B. The left and right ends of the rectangular cylindrical case 70 are provided on the inside air side rectangular flow path 5.
The partition wall portion 73A is closely attached so that No. 4 is located. Below the left and right inner bending flanges 77A, left and right end inside air side rectangular channels 54 are located, and all outside air side rectangular channels 55 communicate with the outside air exhaust port 72A.

The inside air intake / exhaust ports 71B and 71C are formed in the entire width of the cylindrical case 70. In this way, air can be sent into all the inside air and outside air side rectangular flow paths 54 and 55. Further, in this configuration, all the outside air side rectangular passages 55 communicate with the openings of the flange frame 76, and the scattered water that accidentally enters the passages 55 is quickly transmitted from the outside air intake port 2D of the door. Is discharged.

Reference numeral 8 denotes an accessory box provided on the housing 1 for housing the resistor unit 108. The accessory box 8 is formed with an opening 8A almost entirely on the front surface, and the lid 9 is screwed. An exhaust port 8C is provided on the upper surface, and an exhaust louver 10 is provided. Further, U-bent portions 8F are formed on the left, right, upper and lower sides, and function as walls for preventing airflow loss and guides for the case 27.

The resistor unit 108 is slidably housed on the outer bending flange 77B of the duct 77, and its configuration and fixing method are the same as those in the first embodiment, so that the description is omitted.
Also, the wiring configuration of the cable 45 connected to the connector 46 is the same as that of the first embodiment, and the description thereof will be omitted.

In FIG. 6, the high-temperature air in the housing 1 is pushed into the inside-air-side rectangular flow path 54 of the heat exchanger 109 by the operation of the inside-air pushing fan 21 as shown by an arrow a.
The air is then diverted back and forth, and returned to the housing 1 again from the inside air exhaust port 71C. On the other hand, by the operation of the cooling fan 26, the low-temperature air outside the control panel 102 is sucked from the outside air intake ports 2D of the front and rear doors 2 as shown by the arrow b, and the heat exchanger 1
09, the air is diverted in the outside air-side rectangular flow path 55 and is drawn into the cooling fan 26.
8 is discharged. Thereafter, the air flows through the periphery of the resistor 28 and is exhausted from the exhaust port 8C to the outside of the control panel. As described above, heat is exchanged via the heat transfer plate 73 by the forced convection in the inside air side rectangular channel 54 and the outside air side rectangular channel 55, and the housing 1
The air inside is cooled.

Since the fan unit 110 and the resistor unit 108 are in close contact with each other and the case 27 functions as a duct leading to the exhaust port 8C, the air flow discharged from the cooling fan 26 has no airflow loss, and the resistor 28 is good. Air cooled. As described above, since the cooling fan 26 also functions as the outside air fan of the heat exchanger 109 and the direct air cooling fan of the resistor 28, required space and cost can be saved.

The heat exchanger 109 has the following advantages over the conventional heat exchanger provided on the ceiling of the control panel.
For the conventional heat exchanger installed on the ceiling, it is necessary to perforate the inside air intake / exhaust port on the ceiling, but to ensure the strength of the ceiling plate, and general reinforcing frames, door flanges, It is not provided on the outer peripheral portion of the ceiling plate due to the presence of the suspension bolt. In this case, the length and width of the heat transfer plate of the heat exchanger are restricted, and a large cooling capacity cannot be obtained. According to the heat exchanger 109 of the present invention, a heat transfer plate extending over most of the cross section of the housing 1 including the inner space of the door can be formed, and a large cooling capacity suitable for indirect air cooling of a processing power supply unit having a large heat generation amount. Is obtained.

Further, in the above-mentioned conventional heat exchanger, the outside air is sucked in from one end of the horizontally arranged heat transfer plate and exhausted from the other end. It is easy to cause adverse effects. According to the heat exchanger 109 of the present invention, since outside air is sucked in from both ends of the heat transfer plate and exhausted upward from the center, the adjacent machine tool and the operator are not adversely affected by heat, and the amount of intake air is largely reduced. The heat transfer coefficient of the heat transfer plate can be improved.

The high-temperature air in the casing 1 is pushed into the inside-air-side rectangular flow passage 54 from the central portion in the control panel, cooled by heat exchange, and returned into the casing 1 from the inside-air exhaust port 71C.
The air flow from the inside air exhaust port 71 </ b> C reaches below along the inner surface of the door 2 without colliding with the units 103 and 104 in the control panel. In this way, a short circuit, which is immediately sucked into the inside air pushing fan 21 from the inside air exhaust port 71C, is prevented, and the generation of a hot spot in the control panel is prevented.

In the second embodiment, the resistor unit 108 is mounted on the upper surface of the ceiling of the housing 1. However, a similar effect can be obtained by applying the present invention to a control panel having no resistor unit. in this case,
The cooling fan 26 may be provided on the upper surface of the ceiling of the housing 1.
Further, although the door 2 is provided at the front and rear, one side may be configured by a side wall, and the longitudinal direction of the heat exchanger 109 may be disposed in the left and right direction of the housing 1. In the first and second embodiments, the resistor 23 is mounted on the upper surface of the ceiling of the housing 1 and directly cooled by air.
However, the same effect can be obtained with another heating element such as a reactor having relatively excellent environmental resistance.

[0054]

As described above, according to the present invention, the upper side and the lower side provided on the ceiling surface by the air flow on the suction side of the cooling fan for forcibly air-cooling the heating element mounted on the ceiling of the housing. Since the heat transfer plate having the open channel is cooled, the inside of the control panel is indirectly cooled by the heat exchange action of the heat transfer plate, and the channel flow is opened above the heat transfer plate. The air flow pressure loss due to the sudden contraction at the entrance of the passage is reduced, the amount of intake air can be increased, and the forced convection through the open channel below the heat transfer plate provided on the ceiling surface and the side wall The forced convection in the inside air of the separate heat exchanger is not decelerated due to collisions, and the agitation of air in the control panel is promoted. Therefore, the heat of the heat exchanger required for indirect air cooling in the processing power supply section of the control panel The transmission rate can be improved, and the entire control panel can be constructed inexpensively. , Uniform cooling process without hot spot occurs is possible in the control panel.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a cooling structure (Example 1) in a control panel according to the present invention.

FIG. 2 is an enlarged view of a main part showing the cooling structure shown in FIG.

FIG. 3 is a sectional view taken along line III-III shown in FIG. 2;

FIG. 4 is a perspective view showing the configuration of the fan case shown in FIG. 1;

FIG. 5 is a perspective view of a main part showing an upper end portion of the door shown in FIG. 1;

FIG. 6 is a schematic longitudinal sectional view showing a cooling structure (Example 2) in a control panel according to the present invention.

FIG. 7 is an enlarged view of a main part showing the cooling structure shown in FIG. 6;

8 is a cross-sectional view taken along the line VIII-VIII shown in FIG.

[Explanation of symbols]

Reference Signs List 1 housing, 2 doors, 2A, 2D outside air intake, 3 ceiling, 8 accessory box, 8C exhaust, 12 case, 13 heat transfer plate, 14 inside air suction fan, 15 outside air suction fan, 16 heat transfer plate, 17 seal Metal fittings, 18 seal members, 21 inside air pushing fan, 22 rails, 23
Case, 25 panel, 25C inclined wall, 26 cooling fan, 27 frame-shaped case, 28 resistor, 54 inside air side rectangular flow path, 55 outside air side rectangular flow path, 61 elastic body, 7
0 square tubular case, 73 heat transfer plate, 74 seal fitting,
75 seal member, 76 flange frame, 77 duct,
101, 102 control panel, 103 constant voltage DC unit, 104 switching unit, 105, 106,
109 heat exchanger, 107,110 fan unit,
108 resistor unit.

Claims (5)

(57) [Claims] 1. A constant-voltage DC unit, a switching unit, a control board on which a large number of electronic elements are mounted, and the like are housed in a dust-tight enclosure, and a ventilated accessory disposed on a ceiling outside the enclosure. In a control panel in which a heating element such as a power resistor is housed in a box, a corrugated transmission in which groove-shaped flow paths having upper and lower openings are alternately formed on an outer surface of a ceiling below the heating element. A heat plate is disposed horizontally, and the lower surface of the heat transfer plate is closed except for a portion serving as an air intake / exhaust port. A rectangular flow path is formed, and a fan case is disposed between the upper surface of the heat transfer plate and the heating element to form a rectangular flow path on the open air side. An inside air cooling fan for guiding the air to the inside air side rectangular flow path, A cooling fan that passes through the outside air-side rectangular flow path from the air intake port, flows through the periphery of the heating element so as to forcibly cool the heating element, and discharges air to a flow path reaching the exhaust port of the accessory box is provided inside the fan case. A control panel, wherein heat is exchanged through a heat transfer partition between the inside air side and outside air side rectangular flow paths. 2. A cooling fan disposed between an upper surface of the heat transfer plate and a heating element is mounted in a box-like case that is detachably mounted via a rail, and the box-like case is 2. The control panel according to claim 1, wherein the front and rear walls located at both ends of the heat transfer plate in the longitudinal direction are formed as inclined surfaces such that the front and rear walls widen upward from the bottom thereof. 3. 3. A door provided in a front opening of the housing and a front surface of the accessory box are formed on the same surface, and one of inner bending flanges of the door which comes into contact with an upper end flange of the housing opening via packing. The notch is notched, and the notch is filled with an elastic body. The connection cable from the heating element and the cooling fan in the accessory box to the inside of the control panel is elastically connected to the upper end flange of the housing opening. The control panel according to claim 1, wherein the control panel is sandwiched between a body and wired in a dust-proof manner. 4. A control panel in which a constant-voltage DC unit, a switching unit, a control board on which a number of electronic elements are mounted, and the like are housed in a dust-tight enclosure. Corrugated heat transfer plates in which groove-shaped flow paths having upper and lower sides having a length substantially equal to the depth length between the surfaces are alternately formed are disposed flat, and the heat transfer plates are It is mounted in a rectangular tubular case whose both ends are in contact with the outside air intake holes formed in the front and rear surfaces of the housing, respectively. The inside air side rectangular flow path is formed, and the outside air side rectangular flow path communicating with the outside air intake port on the front and rear surfaces of the housing is formed by the groove-shaped flow path whose upper side is opened, and the rectangular cylindrical case is formed. On the upper surface, an opening connected through a duct to an exhaust port provided on the housing ceiling, And the inside air intake and exhaust port with are bored on the surface, through the external air-side rectangular channel from the duct or the outside air intake port of the housing front and rear surfaces thereon,
A cooling fan for exhausting outside air is provided to an exhaust port of a casing ceiling, and an inside air cooling fan for guiding air in a control panel to a inside air side rectangular flow path is provided on a lower surface of the rectangular cylindrical case. A control panel characterized in that heat is exchanged through a rectangular flow path partition on the air side and on the outside air side. 5. An inside air intake port is formed at a longitudinally central portion of the lower surface of the rectangular cylindrical case, and inside air exhaust ports are formed at both front and rear ends in the longitudinal direction. The air inside the control panel is sent into the inside air side rectangular flow path by the provided inside air cooling fan, and the air flow from the inside air exhaust port flows along the side wall of the housing. Control panel.