JPH04338794A - Cooling device of large-sized video display device - Google Patents

Abstract

PURPOSE:To cool the display part of the large-sized video display device with outside air passed through a filter by providing an electric fan and a booster fan on the rear side of the large-sized video display device. CONSTITUTION:Plural display units 2 are provided to constitute a large-sized display surface 1, the cooling fan 10 is provided on the rear side, and the booster fan 17 is further provided; and the air filter 16 which processes the outside air is provided and an air capacity adjusting damper is provided between the air filter 16 and booster fan 17 to take the outside air in, thereby controlling the temperature of fluorescent display tubes that the display units 2 are equipped with.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a large-sized image display device that uses fluorescent tubes or the like as light emitting elements.

0002

2. Description of the Related Art Conventionally, a cooling device for a large-sized image display device of this type has been provided with a blower device on the back side of a large-sized image display portion, as described in Japanese Patent Application Laid-Open No. 59-20408. The tube is configured to be cooled by driving the blower. FIG. 10 shows a cooling structure of a conventional large-sized video display device. In FIG. 10,
50 is a display screen, 51 is a display unit that houses a circuit unit for driving light emitting elements, 52 is a blower that takes in outside air and blows it to the back of the display unit in order to cool the light emitting elements, 53 is a cover for the blower, and 54 is outside air. This is a louver provided at the intake port, and includes a casing that covers the display section 51.

Next, the operation of the above conventional example will be explained. In the above conventional example, when operating a large video display device,
The light emitting elements (not shown) generate heat and the temperature of the display screen 50 rises, and the temperature of the display section 51 having a drive circuit also rises, and the display screen 50 and the display section 51 are cooled by operating the blower 52. can do.

0004

[Problems to be Solved by the Invention] However, the above-mentioned conventional cooling device for a large image display device has a structure in which the display screen and display section are cooled by operating a blower with outside air, so it is difficult to stop the large image display device. Even when the air is turned on, a large amount of power is required to run a large-capacity blower, and when operating a large video display device, the lack of a filter prevents air from entering the outside air. There is a problem in that the mist-like water droplets that are inhaled may condense on the display screen and devices in the display section, causing rust on those devices. The present invention solves such conventional problems, and provides a cooling device for a large-sized image display device that can save energy and prevent rusting. The purpose of the present invention is to provide a cooling device for a large-sized image display device that can stably operate a blower and control the temperature of fluorescent tubes, etc. of the large-sized image display device when operating a large-sized image display device, thereby obtaining excellent images. It is something.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a blower that is evenly distributed on the back of the display section of a large-sized video display device, and also provides a booster fan having performance equivalent to the blower performance. A filter is provided on the suction side of the booster fan, and a duct is provided to communicate with the outside air to the filter. In order to achieve another object, a check damper is provided on the discharge side of the plurality of booster fans, and an air volume adjusting damper is provided between the filter and the booster fan.

[0006]

[Operation] Therefore, according to the present invention, the outside air that cools the display part during operation of the large-sized image display device is introduced through a filter to remove water droplets contained in the outside air in the form of mist. It also has the function of being able to filter outside air containing substances that are harmful to rust prevention, and rust prevention of large video display devices.
Even when the large image display device is not operating, by operating several of the multiple booster fans,
It is possible to make the back side of the display part more static pressure than the side where the image is viewed, and it is possible to prevent harmful substances from entering the display part from the display side to prevent rust, resulting in energy-saving operation. Can be done. Furthermore, according to the present invention, since the air volume adjustment damper is provided between the filter and the blower, by adjusting the opening degree of the air volume adjustment damper, the opening degree of the air volume adjustment damper can be adjusted because there is little resistance in the initial stage of the filter. By increasing the opening degree of the air volume adjustment damper as the filter life approaches the end of its life, the load on the blower can be kept constant and stable operation can be achieved. In addition, when operating some of the booster fans, a check damper is provided on the blower discharge side, which prevents the blown outside air from flowing backwards and allows efficient operation. You can do it as you like.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing a large-sized video display device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a display surface for displaying images, and a large number of display units 2 equipped with a plurality of fluorescent display tubes (not shown) are arranged in a plane to form a display surface of several tens of square meters. Reference numeral 3 denotes a cover provided around the display surface 1 on the same surface as the display surface 1, and a large clock 4 and a running timer 5 are provided on the left side. 6 and 7 are side chambers provided on the left and right sides, and are located on the back side of the architectural panel 8 (FIG. 2). FIG. 2 shows a cross section taken along line AA in FIG. In FIG. 2, 9 is an H-shaped steel that fixedly supports the display unit 2;
Reference numeral 10 denotes a plurality of air blowers 12 evenly arranged on a partition wall 11 located at a predetermined distance from the back side of the display unit 2;
is a side partition wall, which together with the partition wall 11 constitutes an air chamber 13. 14 is a duct connected to the outer wall 15 of the building, 16 is an air filter provided in a ventilation path for outside air introduced from the duct 14, and 17 is a booster fan serving as a driving source for sucking outside air from the duct 14 to the air filter 16 from outside. , 18 is a fan casing, and 19 is an entrance door provided on the left and right sides for entering the wind circuit when maintaining the air filter 16. 20 is a rear wall that guides outside air discharged by the booster fan 17 to the blower 10;
Reference numeral 1 denotes a control panel that houses equipment for controlling the blower 10, booster fan 17, and the like. FIG. 3 shows a cross section taken along line BB in FIG. 22 is the second floor, which is made of lath metal or grating material that allows easy ventilation, and supports the air inlet system section 23 and the control panel 21. However, the lower part of the air inlet system section 23 is constructed of a sheet metal floor that cannot be ventilated because the outside air is bypassed. 24 is a distribution board that branches the power supply to the display unit 2, 25 is a control rack that controls the video, and 26, 27
, 28, 29 pipes for measuring static pressure in the spatial spaces
(not shown) are provided, and pipes for measuring these static pressures are led to a control panel 21. 4 and 5 show details of the air inlet system section 23. In FIGS. 4 and 5, 30 is a motor that drives the booster fan 17, and 31 is a motor provided between the booster fan 17 and the air filter 16. The air volume adjustment damper is driven by a drive motor 32 to adjust the opening degree of the air volume adjustment damper 31. 33 is a check damper provided at the booster fan discharge port, and 34 is a frame into which the air filter 16 is divided into several pieces. A sensor (not shown) for directly measuring the temperature of the fluorescent display tube (not shown) is attached to the fluorescent display tube, and a lead wire (not shown) of the sensor is led to the control panel 21. The control panel 21 is equipped with a controller (not shown) that detects the temperature of the fluorescent display tube and outputs a signal to drive the blower 10 by changing its rotational speed in steps.

Next, the operation of the above embodiment will be explained with reference to FIG. When the screen of the large video display device is operated (S1-YES), the blower is stopped because the fluorescent display tube has not reached a predetermined temperature (S2-NO). At that time, the booster fan 17
Of the three booster fans 17 on each side of No. 3, a total of two, one on each side, are operated (S3). Next, when the fluorescent display tube reaches a predetermined temperature, the blower 10 is operated at a rotation speed of LOW (S2-YES). At that time, when the L signal is continuously recognized on the control panel 21 for several seconds, that is, when the temperature of the fluorescent display tube continues to operate the blower 10 and the temperature does not decrease (S4-YES), the air inlet system section 23 A total of four booster fans 17, two each on the left and right sides, are operated (S5). When the temperature of the fluorescent display tube drops below a predetermined temperature, the blower 10 stops, so the booster fan 17
will switch from four-unit operation to two-unit operation. Next, when the outside temperature rises or the type of image is often a white screen, the temperature of the fluorescent display tube rises, and when it reaches a predetermined temperature, the blower 1
0 is a rotation speed ME that is faster than the rotation speed LOW mentioned above.
It is driven by D. At that time, when the M signal is continuously recognized on the control panel 21 for several seconds (S6-YES), either the left or right booster fan 1 of the air inlet system section 23
71 fans are operated in addition to the 4 units that were previously operating, and 5 booster fans 17 are now in operation (S7). When the temperature of the fluorescent display tube drops below a predetermined temperature, the blower 10
Since the operation is OW, one booster fan 17 is stopped and four booster fans 17 are operated. Furthermore, when the temperature of the fluorescent display tube rises and reaches a predetermined temperature, the blower 10 becomes HIGH operation (S
8-YES), 6 booster fans 17 will be operated (
S9). When the temperature of the fluorescent display tube falls below a predetermined temperature, the blower 10 enters MED operation. Furthermore, if the air filter 16 is clogged with dust and the like and is nearing the end of its life, less outside air will be sent by the booster fan 17, causing the temperature of the fluorescent display tube to drop below a predetermined temperature (S10-YES).
). At that time, all the provided booster fans 17 are operated (S11) and an alarm is displayed (S12). Next, when not operating the screen of the large video display device (S1-NO)
, a total of two booster fans 17, one each on the left and right sides of the air inlet system section 23, are operated. booster fan 17
A check damper 33 is provided on the discharge side of each pump, and opens and closes at the same time as each booster fan 17 starts and stops. This prevents outside air from flowing back into the outdoors. In this way, according to the above embodiment, when the screen of the large image display device is operated, the blower 10 is operated in various operating states including a stopped state, and each operating state is simultaneously detected and the booster fan 17 is set. The screens of at least two large image display devices are operated even when the screen is stopped, so air containing chlorine ions generated when disinfecting pool water in indoor pools, etc. It has the advantage that it can prevent intrusion into the display section of the display device and can effectively prevent rust. In addition, the air filter 16 is selected to be a mid-performance filter, which can filter and remove atomized water droplets contained in the outside air, and which may come into contact with the air containing chlorine ions and prevent the internal equipment of the large image display device from coming into contact with the air containing chlorine ions. It has the advantage of being able to prevent corrosion. In addition, if a high-performance filter is selected for the air filter 16, the large image display may be used in areas where the outside air is contaminated with industrial areas or waste gas from cars, areas near the coast, or areas that are affected by seawater or sea breeze. When installing the device, it is possible to prevent each device from malfunctioning or rusting due to the above-mentioned effects, and it has the advantage of being able to install the large-sized video display device anywhere and under any outside air conditions. Furthermore, even when the large video display device is not in operation due to installation in a pool or coastal area, the minimum number of booster fans 17 are operated and the outside air is processed by the air filter 16 and blown, thereby saving energy. The blower 10 can be stopped, extending the life of the blower, and the interior of the large video display device can be maintained at positive pressure with treated fresh air, which can prevent rust. has.

Next, other operations in the above embodiment will be explained. When the booster fan 17 is operated, the check damper 33 opens. At that time, the pipe 26 that measures the static pressure on the upstream side of the air filter 16 and the air volume adjustment damper 31
Pipe 2 for measuring static pressure between and booster fan 17
7 is detected by the control panel 21, and the air volume adjustment damper 31
Supports the opening degree. In general, when the air filter 16 is initially used, it is not clogged with dirt and the like, so the pressure loss is small, but as it is used, it becomes clogged with dirt and the pressure loss increases. Further, the static pressure-air volume (P-Q) curve of the booster fan 17 has respective characteristics as shown in FIG. In this embodiment, the air inlet system section 23 is provided with a total of six booster fans 17 on the left and right sides. On the other hand, since the rotation speed of the blower 10 changes in steps according to the determined temperature of the fluorescent display tube, a constant amount of air is produced according to each operating condition. Therefore, the booster fan 17 also needs to produce an air volume equivalent to the air volume discharged by the blower 10. As shown in FIG. 7, the operating range of the booster fan 17 is determined. The air volume adjustment damper 31 detects the differential pressure signal shown in FIG. 8 so that the differential pressure is always constant in any state in which a plurality of booster fans 17 are operated so as to operate at the static pressure within the operating range described above. Then, the air volume adjustment damper 31 is opened and closed by the drive motor 32. When the air filter 16 is clogged with dust and the like and approaches the end of its life, the air volume adjustment damper 31 opens to 100%, and the differential pressure exceeds a certain level (the limit of use of the booster fan 17).
(See FIG. 7), an alarm signal is issued from the control panel 21. According to the above implementation, even if the blower 10 of the large-sized video display device is operated at different rotational speeds, the performance of the booster fan 17 is not affected by dirt on the air filter 16 and is stable. It has the advantage of being able to maintain a stable operating state, eliminating variations in fluorescent display tube brightness, and providing excellent images.

[0010] Further, other operations will be explained. Several booster fans 17 are always operated whether or not the large-sized video display device is operated. At that time, the pipe 28 for measuring the static pressure on the side of the pool room and the pipe 29 for measuring the static pressure inside the large video display device are constantly measured, and the pressure difference between them is detected by the control panel 21. In FIG. 9, when the pipe 28 for measuring the static pressure in the pool room becomes larger than the pipe 29 for measuring the static pressure inside the large image display device (ΔP>0), the air in the pool room is inside the large image display device. An alarm signal will be issued due to the intrusion. This alarm signal can be sent to an exhaust fan (not shown) provided in the building to activate the exhaust fan. In this way, according to the above embodiment, even if the internal pressure of the large video display device becomes lower than the static pressure of the pool room for some reason, an alarm is displayed, so that the process can be easily handled and the internal pressure of the large video display device can be reduced. It has the advantage of being able to prevent from rusting.

[0011]

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects. (1) A blower is installed on the back of the large image display device, and an air inlet system equipped with an air filter and a booster fan cools the large image display device with air that has been processed from outside air, making it possible to display large images. Rust can be prevented whether the device is in operation or not, and energy-saving operation can be achieved. (2) Since the air inlet system is equipped with an air volume adjustment damper, it is possible to efficiently synchronize the performance of the booster fan with the blower that cools the display section of the large video display device, producing excellent images. Obtainable. (3) Equipped with a differential pressure measuring device between the inside of the large image display device and the room on the screen side, it can be linked with the entire building system and prevent air from entering the large image display device, which can cause harmful rust. Intrusion can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an external front view of a large-sized video display device including a cooling device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a plan sectional view of a main part of an air inlet system section in an embodiment of the present invention.

FIG. 5 is a vertical sectional view of a main part of an air inlet system section in an embodiment of the present invention.

FIG. 6 is a block diagram showing the operation of a blower and a booster fan in an embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a P-Q curve of a booster fan.

FIG. 8 is an explanatory diagram showing the opening degree of the air volume adjustment damper and a differential pressure signal.

FIG. 9 is a block diagram showing the differential pressure relationship between the video display side chamber and the inside of the large video display.

FIG. 10 is a diagram showing a cooling structure of a conventional large-sized video display device.

[Explanation of symbols] 1...display surface, 2...display unit, 3...cover,
4...Large clock, 5...Running timer, 6,
7... Side room, 8... Building panel, 9... H-shaped steel,
10... Blower, 11... Partition wall, 12... Side partition wall, 13... Air chamber room, 14... Duct,
15...Outer wall, 16...Air filter, 17...Booster fan, 18...Fan casing, 1
9...Entrance door, 20...Back wall, 21...Control panel,
22... 2F floor, 23... Air inlet system section, 24... Distribution board, 25... Control rack, 26
, 27, 28, 29... Pipe for measuring static pressure, 30
...Motor, 31...Air volume adjustment damper, 32...Drive motor, 33...Return damper, 34...Frame, 5
0...Display screen, 51...Display section, 52...Blower,
53... Blower cover, 54... Loud.

Claims (3)

[Claims] 1. A large-sized video display device using a fluorescent tube or the like as a light-emitting element, in which a plurality of display units equipped with a plurality of the light-emitting elements are arranged to constitute a video display screen, and air is provided behind the display screen to cool the light-emitting elements. An air inlet system is provided with a blower to send in air, a high-performance filter is provided, and a plurality of booster fans having performance equivalent to the amount of air sent by the blower are provided, and a duct that communicates with outside air is provided. Cooling system. 2. The large-sized video display according to claim 1, wherein an air volume adjustment damper is provided between the high-performance air filter and the booster fan of the air inlet system, and a check damper is provided on the blowing side of the plurality of booster fans. Equipment cooling system. 3. The cooling device for a large image display device according to claim 1, further comprising a differential pressure device for measuring static pressure inside the large image display device and on the screen side.