DE202011051862U1 - Cooling device for cooling a video projector - Google Patents

Abstract

Cooling device for cooling a video projector, with a housing (21) which can be connected to the video projector (10) with the interposition of an interface and / or a thermally conductive connection, and a closed cooling circuit, this comprising at least one refrigeration compressor, a condenser (23) , an expansion valve and an evaporator (25), characterized in that a heavy-duty compressor (22) is used as the refrigeration compressor.

Description

The present invention relates to a cooling device for cooling a video projector, with a housing which is connectable with the interposition of an interface and / or a heat conductive connection with the video projector, and a closed cooling circuit, comprising at least one refrigeration compressor, a condenser, an expansion valve and an evaporator.

Such a cooling device is already known from the prior art. In particular, it serves to cool a video projector, which is used, for example, in the area of a train station, in particular a subway station.

The advertising industry is particularly benefiting from the development of qualitatively increasingly high-quality projectors, since in this way the space occupied by an advertising message can be sold several times. In today's stations, especially in their particularly suitable for this purpose underground stations, therefore, video projectors of this type are increasingly to be found, which project on the opposite of the platforms tunnel walls such video messages.

Since the lighting in a subterranean station can be very bright, very high demands are placed on such video projectors, which have to bring a high level of light output, usually about 1400 W. In order to fit in the image of the underground stations in a suitable manner, conversely, the video projectors must not be arbitrarily large, the said 1400 W must be made available in a relatively very narrow space. In addition, the fact that usually such video projectors are set up in the two-way, with two opposing video projectors, which are aligned with each other, radiate over an intermediate mirror assembly to the side. As a result, both tunnel walls of a tunnel can each be charged with a video message.

Especially the limited available space, however, means that very high demands are placed on the cooling capacity of the cooling devices connected to the video projectors. A particular problem arises from the fact that from the trains entering from both sides in the underground station trains a cloud whirled up dust, which among other things contains metallic dust from the wheel and brake abrasion, is inserted into the tunnel. Such metallic dust would damage the electronics of the video projector, so it is necessary to work with a fully enclosed system. An increase in the cooling air flow is therefore not suitable for solving the problem of adequate cooling.

At present, there is the situation that although encapsulated cooling systems are known, which are also used in connection with these video projectors, but these can not usually cool in a sufficient manner.

It is therefore an object of the present invention to provide a cooling system which is sufficient for the stated task and which can bring a very high cooling capacity, particularly in a small space, while at the same time having to be an enclosed system.

This object is achieved by a cooling device for cooling a video projector according to the features of claim 1. Further, useful embodiments of such a cooling device can be taken from the subclaims.

According to the invention, such a cooling device has a closed cooling circuit which has a refrigeration compressor, a condenser, an evaporator and, between the condenser and the evaporator, an expansion valve. This arrangement is housed in a housing, which also provides strict room requirements, after having to comply with the existing video projectors suitable, predetermined sizes.

The required efficiency is achieved by using a heavy-duty compressor as the refrigerant compressor. This is able to run against a large pressure, so that in this way the required equipment for a sufficient cooling capacity can also be supplied. In particular, in the context of the possibilities of particularly large-sized capacitor and the evaporator, which can accomplish a corresponding cooling performance can be operated by this inventive solution in the refrigerator. In addition, this is a cooling system with a closed cooling circuit, which makes it possible that the video projector does not come into contact with the burden of metal dust possibly contained in the ambient air.

Within the scope of the invention, the evaporator is assigned an interior fan via which heated air is sucked in from the side of the video projector and supplied to the evaporator. This heated air is cooled in the area of the evaporator and can then be returned to the video projector. Preferably, the internal fan is operated at an operating point at at least approximately 570 m ² per hour at 150 Pa pressure.

The condenser, in turn, advantageously has an external fan, with which heated air can be removed from the region of the condenser and fresh air can be supplied again, with which cooling of the condenser is carried out. In the condenser, the coolant conveyed in the closed cooling circuit, which is conveyed to the condenser in a hot state, is cooled and liquefied and further conveyed via the expansion valve in the direction of the evaporator. The external fan is preferably operated at an operating point at at least approximately 800 m ² per hour at 20 Pa pressure.

Advantageously, at least one filter nozzle for filtering the coolant can also be assigned to the expansion valve.

Furthermore, it makes sense to realize a control of the cooling circuit to the effect that a cooling point controller is provided for temperature control.

It has also shown to be a useful solution that a heavy-duty compressor is designed so that it has a cooling capacity of at least approximately 1785 W at 12 ° C. Of course, this is not an ideal value but a specific nominal value tested in practice. A certain deviation from this, should also be included in the invention.

The invention described above will be explained in more detail below with reference to an embodiment.

Show it

1 a video projector with two refrigerators in a perspective view obliquely from above, as well

2 a cross section through a cooling device according to the invention in a side view.

1 shows a video projector 10 , which comprises a total of two projection devices. These are common in the projector cabinet 11 recorded and aligned so that one projector at a time projected its image onto the other projector. To bring the projector image to the outside, so far, a mirror is mounted between the two projectors, which deflects the image by 90 ° and through a glass pane 12 from the projector cabinet 11 throws out. Above this projector arrangement are a cooling device for each projector 20 arranged, with each cooling unit 20 allows to cool the associated projector with an encapsulated cooling circuit solution.

2 shows a cross section through such a cooling device 20 , This has in its interior initially a heavy duty compressor 22 on, which is connected to a closed cooling circuit. In this circuit is the heavy duty compressor 22 from an evaporator 25 supplied with cooled, gaseous coolant, which from the heavy duty compressor 22 is compressed. The capacitor 23 , which is the heavy duty compressor 22 is followed, the refrigerant then liquefies with the release of heat and then passes the liquid coolant through the expansion valve back towards the evaporator 25 further. There, the coolant evaporates while absorbing heat, whereupon the cooling cycle begins again. The heat output of the capacitor 23 This is done by an outdoor fan 24 supports, while the heat absorption of the evaporator 25 through an indoor fan 26 is encouraged. The latter is in contact with the video projector to be cooled 10 ,

Thus described above is a cooling device for cooling a video projector, which can realize the required cooling capacity on the available, narrow space and at the same time as an encapsulated solution is executable.

LIST OF REFERENCE NUMBERS

10

video projector

11

the cabinet

12

pane

20

cooling unit

21

casing

22

Heavy starting compressor

23

capacitor

24

external fan

25

Evaporator

26

internal fan

Claims (6)

Cooling device for cooling a video projector, comprising a housing ( 21 ), with the interposition of an interface and / or a heat-conducting connection with the video projector ( 10 ) is connectable, and a closed cooling circuit, this comprising at least one refrigeration compressor, a capacitor ( 23 ), an expansion valve and an evaporator ( 25 ), characterized in that a heavy-duty compressor ( 22 ) is used. Refrigerator according to claim 1, characterized in that the evaporator ( 25 ) an indoor fan ( 26 ) for sucking in on the side of the video projector ( 10 ) has heated air, wherein the Interior fan ( 26 ) is preferably operated at an operating point at at least approximately 570 m 2 / h at 150 Pascal pressure. Refrigerator according to one of claims 1 or 2, characterized in that the capacitor ( 23 ) an outdoor fan ( 24 ) for the removal of heated air from the housing ( 21 ), wherein the outdoor fan ( 24 ) is preferably operated at an operating point at at least approximately 800 m2 / h at 20 Pascal pressure. Refrigerator according to one of the preceding claims, characterized in that the expansion valve is associated with at least one filter nozzle for filtering in the cooling circuit circulating coolant. Refrigerator according to one of the preceding claims, characterized in that the cooling circuit is associated with a cooling controller for temperature control. Refrigerator according to one of the preceding claims, characterized in that the heavy-duty compressor ( 22 ) has a cooling capacity of at least approximately 1785 watts at 12 ° C.

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