AU606959B2

AU606959B2 - Control cabinet

Info

Publication number: AU606959B2
Application number: AU18288/88A
Authority: AU
Inventors: Theobald Blaser; Michael Lehnert; Anton Rodi
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 1987-07-02
Filing date: 1988-06-23
Publication date: 1991-02-21
Anticipated expiration: 2008-06-23
Also published as: AU1828888A; ATE94317T1; CN1030340A; CN1008682B; DE3883868D1; EP0297308A2; JPS6426310A; CA1308801C; EP0297308B1; EP0297308A3; DE3721901A1; JPH0595117U

Abstract

A control cabinet for electrical and electronic components is proposed which is split into two regions. One region (2) is proof against water spray and dust and essentially contains the electronic components, such as boards and racks. In this region, the heated losses are dissipated by emission through the outer walls. Components with higher heat emissions are arranged in a further region (1). Their heat is dissipated by a fan (4), which introduces ambient air into the upper part of this region so that the temperature in this region essentially corresponds to the environmental temperature. <IMAGE>

Description

AUSTRALIA

Patents Act 606 COMPLETE

SPECIFICATION

(ORIGINAL)

Class Int Class I occ p3"-.

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R DRtJCYZASCHlINTh AKPiIL'GESE~LSCHAFT :~urur~an--~ngo52-60, D-6900 Hcidolburq, T'cdcral Rcpublic of Cr'rr,In7jj AlNTON L~ODI TiHEOBALD BLASLR NIC11AEL LLHNrR2 PH11LLIPS, ORMONDE &FITZPATRICK Patent and Trade Mark Attorneys 3 67, Collins Street Melbourne, Australia, 3000 Complete Specifi-ation for the invention entitled- CONTROL CABINET The following statement iq a full description of this invention including the best method of performing known to applicant(s): P 19/11/771 a a oacC C c CCC1

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DC CC The invention relates to a control cabinet for electric and/or electronic components. It is generally known to use modular-design control cabinets for housing electric or electronic components. Such control cabinets usually have a 19-inch grid and can be set up in rows.

The basic construction of the control cabinets consists of a frame structure with outside walls and mounting walls, with heat exchangers being provided in order to dissipate the resulting heat loss.

Disadvantages of these known control cabinets are the high mechinical production outhpy and, caused by the double walls, poor heat radiation. Furthermore, particularly if a large quantity of heat is to be dissipated, an elaborate heat-exchanger system is required.

The object of the invention, therefore, is to create a control cabinet, said control cabinet being particularly low-cost to manufacture and permitting simple and reliable dissipation of heat.

The present invention provides a control cabinet for electric and/or electronic components including a first region for accommodating components of high heat radiation and/or heat dissipation elements, a second re-ion divided from said first region by a partition wall, venitilation openings arranged in an outside wall of the control cabinet in an upper and lower part of said first region, a fan d'sposed in said upper part of said first region for conveying outside air through the upper ventilation openings into the interior of said first region, the second region being closeable in a splashproof and dust-tight manner for accommodating components requiring this kind of protection.

An essential advantage of the invention consists in the fact that, depending on their required degree of protection and the amount of heat they produce, the components can be disposed in different regions of the control cabinet. This means that highly sensitive components, such as electronic circuits and similar, are disposed in a dust-tight and splash-proof region (region with their heat loss being transmitted to the X -2- A- l~ surrounding atmosphere through the walls of the control cab -et, i.e. without the use of heat exchangers or similar.

Accommodated in a first region of the control cabinet are components of high heat loss, for example transformers, c CC C a a C c 0 C S2C C 000 6 C inductors, heat sinks or similar, which are less sensitive to environmental influences, with the result that they can be cooled by the outside air. In this connection, the outside air 1 drawn in from above. This has the further advantage that this air contains less dirt and/or fewer particles of dust.

In azrembodiment of the invention, it is proposed to use the partition wall between the two regions of the control cabinet as a mounting wall for those components that, firstly, are to be accommodated ir a dust-proof manner and, secondly, have a higher heat losE To accommodate these components, the partition wall is provided with penetrations, so that the heatradiation elements assigned to the components, such as heat sinks, are able to extend into the first region and are cooled by the outside air.

In order to make ideal use of the inside walls of th:second region necessary for heat radiation, it is proposed in a furtherjembodiment of the invention to provide not a double mounting wall, but merely a mounting frame on an inside wall for the attachment of components, said mounting frame being able to cairy said components on webs. This mounting frame is connected to the wall, for example, by means of studs and thus permits the e unhindered exchange of heat.

According to a furtherkembodiment, the entire power cabling is situated inside the first region of the control cabinet. This ensures that, when the control cabinet is being c connected to the supply voltages and is being taken into service, it is not necessary to open the seccnd region of the control cabinet, this making it possible to prevent unnecessary environmental influences from acting on the second region.

In order to make ideal use of the space in the control cabinet, it is proposed to provide inside the second region a swing-out printed-circuit-board carrier, which, after the control cabinet has been opened, can be swung out of the latter and is thus easily accessible from all sides. This considerably facilitates, in particular, the final assembly of the components.

Of course, it is also possible to locate the components in the first region on a swing-out element.

Such a control cabinet may be used on a printing press, in which case the control cabinet serves to accommodate all ]GD -3- 1 electric and/or electronic components and unites the entire control of the printing press, which is thus centralized. This centralized arrangement of the components allows particularly simple maintenance and simple wiring both of the printing press, which is basically free from electronic circuits, and also of the control cabinet, which can be manufactured complete and can be connected to the printing press merely by means -f cable connections in order to take the printing press into service.

The following description refers in more detail to the various features of the control cabinet of the present invention. To facilitate an understanding of the invention, reference is made in the description to the accompanying drawings where the control cabinet is illustrated in a preferred embodiment. It is to be understood that the control cabinet of the present invention is not limited to the preferred embodiment a illustrated in the drawings.

Fig. 1 shows a front view of a control cabinet; So Fig. 2 shows a side view of a control-cabinet region.

The control cabinet shown in Fig. 1 comprises two regions, a first region 1, which is described in greater detail in Fig. 2, and a second region 2. Only one cable-entry opening with power cables 20 is shown in region 1 in Fig. 1. All other components located therein are shown in Fig. 2.

These regions are separated from one another in a dust-tight imanner by a partition wall 3. Region 2 is of degree of orotection IP 54, since it accommodates sensitive electronic component assemblies. Region 1 complies with at least degree of protection IP 20. It accommodates the components of high heat loss, which, moreover, have lower requirements in terms of the degree of protection.

As' can be seen from Fig. 2, there is in region 1 a radial-flow fan 4, which draws in outside air and supplies it from above to the interior of region 1. The air is drawn in through air slits 5 and flows in lamninar fashion past heat sinks 6, 7, which must dissipate a high heat loss. Additionally heated by a transformer 9, this air escapes again from the control cabinet at lower air slits 8. Virtually ambient temperature is obtained in this manner in this part of the 39 cabinet. In addition, the heat irom region 2 transmitted from emmq_ the partition wall 3 is likewise removed by this circulation of air. The degree of pollution remains very low because of a high air-renewal rate and because of the fact that the air is drawn in in the upper region of the cabinet. Furthermore, there is the possibility of installing dust filters at the air slits The heat sinks 6, 7, which are disposed inside region 1, may be assigned, for example, to power semiconductors located in region 2. In this case, these power semiconductors 10 are positioned on the partition wall 3 in region 2. In order to connect the power semiconductors 10, 11 to the heat sinks 6, 7, the partition wall is provided at these places with penetrations, which are sealed by the heat sinks.

Furthermore, the partition wall 3 may accommodate components 13 that, on the whole, are disposed in region 1 and merel, whose connecting leads are brought into region 2 through dust-right cable lead-throughs 14.

In addition, it is possible to provide the partition S wall 3 on the side facing region 1 with cooling ribs, so that S the heat produced in region 2 is better dissipated through this partition wall.

Situated in region 2 of the control cabinet is a swing frame 15, which contains the electronic components on printedcircuit bcards, which may be, for example, of the plug-in type.

Said swing frame can be swivelled outwards by approx. 180 degrees about the pivot point 12, this making the components and cable connections on the swing frame easily accessible. Furthermore, the swinging-out of the framemakes it possible to insert components into or to wire a mounting frame 1G attached to the rear wall of the control cabinet by means of stud bolts 17. The mounting frame 16 consists of narrow webs, with the result that it covers only a small portion of the rear wall of the control cabinet. Consequently, the rear wall makes a considerable contribution towards radiating the heat produced inside region 2.

Furthermore, it is possible to remove the mounting frame 16 for component insertion, this allowing the otherwise customary second mounting wall to be dispensed with.

The cooling of all the electronic components in this region 2 is accomplished by radiation through the outside walls.

39 To ensure that the heat produced by the electronic components is I transferred to the outside walls, the swing frame 15 is provided with a radial fan 18, which causes the air to flow in a vertical direction from bottom to top through the electronic slide-in units and distributes it uniformly throughout the entire region 2 of the control cabinet. This results, therefore, in a high degree of utilization of the surface area of the cabinet for heat radiation and, furthermore, reduces local overheating.

Thus, the majority of the heat loss from the electronic components housed in this cabinet can be dissipated to the surrounding atmosphere without a heat exchanger. A cable-entry box 19 is installed in the lower region of the control cabinet.

The cabinet consists of a self-supporting sheet-retal structure, with the result that no additional supports are necessary. The swing frame 15 and the mounting frame 16 make it possible to achieve ideal utilization of space, even in the case of a high heat lose from the electronic components.

Both regions are closed off at the front by doors (not shown in the figures), with at least the door for region 2 being S closable in an air- and dust-tight rnanner.

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Claims

1. Control cabinet for electric and/or electronic components including a first region for accommodating components of high heat radiation and/or heat dissipation elements, a second region divided from said fir3t region by a partition wall, ventilation openings arranged in an outside wall of the control cabinet in an upper and lower part of said first region, a fan disposed in said upper art of said first region for conveying outside air through the upper ventilation openings into the interior of said first region, the second region being closeable in a splashproof and dust-tight manner for accommodating components requiring this kind of protection.

2. Control cabinet according to claim 1, further o including: at least one circulating-air fan disposed in the second region, said circulating-air fan serving to direct air through the second region to transfer the heat produced by the components to the outside walls of the control cabinet.

3. Control cabinet according to claim 1 or 2, wherein the components of higher heat radiation within the second region include said heat-radiation elements and are o disposed on Ie partition wall so that only their heat-radiation elements extend into the first region.

4. Control cabinet according to claim 1, 2 or 3, wherein at least one inside wall of the second region supports a mounting frame, said mounting frame covcing only a small part of the inside wall so that the heat can be dissipated towards the outside through this wall. 3U

5. Control cabinet according to any one of the preceding claims, wherein power cables are connectable to components in the first region.

6. Control cabinet according to any one of the preceding claims, wherein the second region includes a swing frame for holding printed-circuit boards, said swing frame being disposed in the control cabinet in such a manner that it can be swung out.

7. Control cabinet according to any one of the preceding claims, wherein the components include -7- I I- electrical and electronic devices for the control of and for providing a power supply to a printing press.

8. Control cabinet substantially as herein particularly described with respect to what is shown in the accompanying drawings. DATED: 20 November 1990 PHILLIPS ORMONDE FITZPATRICKI-c 2 Attorneys for: HEIDELDERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT 0 0 8 4a -8- VHF 1301b