JP2012151298A - Electrical apparatus having filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical apparatus having a filter unit that eliminates the need for maintenance of a filter over a long period of time.SOLUTION: A filter unit 40 includes: a filter 41 that has respective ends attached to reels 42 and 43, is wound around either or both of the reels 42 and 43, extends across an air inlet so as to cover the air inlet, and collects dust contained in air flowing therethrough; a filter cleaner 400 that is arranged between the reels 42 and 43 so as to scrape the dust off the filter 41 by contact with the filter 41 as the filter 41 moves; and reel rotating mechanisms 46 and 46a that rotate one of the reels 42 and 43 in a filter reel-out direction while rotating the other of the reels 42 and 43 in a filter reel-in direction. The reel rotating mechanisms 46 and 46a are operated to perform: normal sending in which the filter 41 is reeled out by a predetermined amount from the one of the reels 42 and 43 and reeled in on the other of the reels 42 and 43; and reverse sending in which the filter 41 is reeled out from the other and reeled in on the one.

Description

  The present invention relates to an electric device including a filter unit.

There is known an image display device in which an image display panel is accommodated in a housing and the image display panel can be visually recognized from the outside through an image display window provided in the housing (see, for example, Patent Document 1).
As an application of this type of image display device, for example, it is conceivable that the image display device is mounted in another device such as an outdoor installation or a vending machine installed outdoors or in another casing.

  In such a case, in the image display device, the image display panel screen is exposed to high temperature not only by heat generated from the internal heating element such as the image display panel but also by sunlight incident from the image display window. There is. If the temperature of the screen or the image display panel is excessively high, there is a possibility that these operations and quality may be abnormal.

  Therefore, in Patent Document 1, a plurality of fans for introducing outside air are provided inside the housing, and the outside and the image display panel are cooled by introducing outside air inside the housing.

JP 2010-175853 A

However, dust and the like are sucked into the enclosure from the fan together with the outside air, and the intake performance of the fan deteriorates or adheres to the heating elements such as the image display panel and circuit board inside the enclosure, so that sufficient cooling performance is achieved. It may not be maintained.
In particular, in an electrical device installed outdoors, the air intake performance of the fan is likely to deteriorate because the outside air contains more dust than indoors.

  Therefore, it is conceivable to provide a filter for trapping dust in the intake section of the outside air. However, the filter is housed inside the housing of the electrical device, or the electrical device itself is incorporated in another device or the like. When the filter is not easily accessible from the outside, maintenance such as filter replacement is difficult.

  An object of the present invention is to provide an electric device including a filter unit that can eliminate the need for filter maintenance over a long period of time.

In order to solve the above-mentioned problem, an electrical device comprising the filter unit of the present invention is
A housing that houses the heating element;
A ventilation passage formed inside the housing for cooling the heating element by circulating air;
An intake port that connects the outside of the housing to the ventilation passage, sucks air outside the housing into the ventilation passage, an exhaust port that discharges air from the ventilation passage to the outside of the housing,
A filter unit for guiding air to the ventilation passage through the intake port;
An electrical device comprising
The filter unit
A pair of reels arranged on both sides of the air inlet and rotatable about an axis;
A filter having an end portion attached to each of the reels, wound around one or both of the reels, traversing so as to block the air inlet, and collecting dust contained in the passing air;
A filter cleaning tool disposed between the reels, contacting the filter, and scraping off dust adhering to the traveling filter;
A reel rotation mechanism that rotates one reel in the filter take-up direction when rotating the other reel in the filter feed direction;
A reel control unit for controlling the reel rotation mechanism;
With
The reel control unit sends out a filter from one reel by a preset feed amount and performs forward feeding to wind up to the other reel, and reverse feed to send out the filter from the other reel and wind up to one reel. In this way, the reel rotating mechanism is operated.

  The reel control unit is disposed in the housing and is electrically connected to a sensor that detects the state of the housing, and it is desirable to operate the reel rotation mechanism based on the state quantity detected by the sensor.

  According to the electrical apparatus provided with the filter unit of the present invention, air can be introduced from the outside of the housing into the ventilation passage through the air inlet and the filter, and dust contained in the air can be collected and filtered by the filter. Can be kept clean, and the heating element can be effectively cooled.

In addition, when the filter is clogged with dust and the filter performance deteriorates, the reel control unit operates the reel rotation mechanism to send out the filter from one reel, and forwards the reel with the other reel. The filter is sent out from one reel and reversely wound up on one reel.
When the filter travels by forward feed or reverse feed, the filter cleaning tool comes into contact with the filter, so that the dust attached to the filter is scraped out, so that the filter can be efficiently cleaned.

  Repeating forward or reverse feed for the length of the filter or a preset number of times, respectively, and further performing this operation multiple times to maintain the intake performance of the filter unit over a long period of time to cool the heating element. It can be performed efficiently, and maintenance such as filter replacement can be made unnecessary for a long period of time, and the number of times can be reduced.

The present invention makes it difficult to replace or maintain a filter such as an electric device installed outdoors, an electric device mounted on another device such as a vending machine, or an electric device installed at a high position such as a ceiling. Suitable for electrical equipment.
Examples of the electric device include an image display device including an image display panel and a liquid crystal projector.

  By detecting a state quantity such as temperature and air flow rate with a sensor that detects the state of the housing and operating the reel rotation mechanism based on the state quantity, the filter is cleaned according to the clogged state of the filter. Can be performed.

FIG. 1 is a perspective view of an image display device according to an embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the image display device as seen from the back side. FIG. 3 is a rear view of the image display apparatus. FIG. 4 is an exploded perspective view of the image display device as viewed from the front side. FIG. 5 is an exploded perspective view of the image display device as viewed from the back side. 6 is a cross-sectional view taken along line AA shown in FIG. FIG. 7 is an enlarged view of region B shown in FIG. FIG. 8 is an enlarged view of a region C shown in FIG. FIG. 9 is an exploded perspective view of the fan filter unit. FIG. 10 is a rear view of the main part of the filter unit. FIG. 11 is a cross-sectional view taken along line DD in FIG. FIG. 12 is an enlarged perspective view showing the image display device to which the fan filter unit is attached. FIG. 13 is a block diagram of the control unit of the fan filter unit. FIG. 14 is an enlarged view of the fan filter unit in which the fan is rotated in the discharge direction while running the filter, and the region B shown in FIG.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
In the present embodiment, the image display device (1) will be described as an example of the electric device, and the image display panel (12), the circuit board (16), etc. will be described as examples of the heating element. Of course, the electrical equipment and the heating element to which is applied are not limited to these.

  Further, the image display device (1) according to the present embodiment is a device that can be incorporated in another device such as a vending machine, but the image display device (1) may not be incorporated in another device. However, it can be used alone, or can be used by housing the outside in a casing for a display or a stand.

  Furthermore, although the image display apparatus (1) according to the present embodiment is assumed to be installed outdoors, it is a matter of course that it can be installed indoors.

  1 and 2 are perspective views of an image display device (1) according to an embodiment of the present invention as viewed from the front side and the back side, respectively. FIG. 3 is a rear view of the image display device (1). 4 and 5 are exploded perspective views of the image display device 1 as viewed from the front side and the back side, respectively. 6 is a cross-sectional view taken along line AA in FIG. 3, and FIGS. 7 and 8 are enlarged views of regions B and C in FIG. 6, respectively.

  As shown in the figure, the image display device (1) includes an image display panel (12) inside the housing (2) having an image display window (22) formed on the front surface, and fan filter units on the intake side and exhaust side. (3) Consists of (5).

The housing (2) includes a front case half (21) on the front side in which a substantially rectangular image display window (22) is formed in the center, and a rear case half (21) joined to the front case half (21). 23)
A transparent glass plate (25) is fitted in the image display window (22), and a longitudinally long opening (26) in which the fan filter units (3) and (5) are fitted to the left and right in the rear case half (23). ) (27) has been established.

  The glass plate (25) has a size larger than that of the image display window (22) of the housing (2), and as shown in FIGS. 7 and 8, a pressing metal (25a) and a seal member (25b ) And is airtightly attached to the peripheral edge on the back side of the image display window (22). In addition, the electrostatic capacitance type touch panel comprised with the transparent sheet | seat member may be affixed on the front surface or back surface of the glass plate (25).

  The image display unit (10) includes an image display panel (12) having a screen (14) on the front surface, and a circuit board (on the back side of the image display panel (12)) that controls the image display panel (12) ( 16). A liquid crystal display panel can be exemplified as the image display panel (12).

As shown in FIG. 5, an intake side flow path forming member (71) and an exhaust side flow path forming member (76) constituting a part of the ventilation passage (70) are attached to the image display panel (12). It has been.
The intake side flow path forming member (71) and the exhaust side flow path forming member (76) are each formed in a shape that holds the image display panel (12) from the left and right.

  The intake-side flow path forming member (71) has a plurality of intake-side openings (72) communicating with an intake-side fan filter unit (3) described later on the back side. 6 and 7, the intake-side flow path forming member (71) communicates with the intake-side opening (72) and is parallel to the screen (14) on the front side of the screen (14). A front opening (73) that opens and a rear opening (74) that opens in a direction parallel to the image display panel (12) on the back of the image display panel (12) are provided.

  Referring to FIG. 5 again, the exhaust-side flow path forming member (76) has a plurality of exhaust-side openings (77) communicating with an exhaust-side fan filter unit (5) described later on the back side. 6 and 7, the exhaust-side flow path forming member (76) communicates with the exhaust-side opening (77) and opens in a direction parallel to the screen (14) on the front side of the screen (14). And a rear opening (79) opening in a direction parallel to the image display panel (12) on the back surface of the image display panel (12).

  6 to 8, the image display unit (10) includes the housing (2) in a state where the intake side flow path forming member (71) and the exhaust side flow path forming member (76) are mounted on the left and right. Housed inside. Specifically, the image display unit (10) includes a gap S1 (FIGS. 6 to 8) between the front screen (14) and the glass plate (25) fitted in the front case half (21). The rear side is accommodated so that there is a gap S2 between the rear case half (23) and the rear case half (23).

  In a state where the image display unit (10) is housed in the housing (2), the front opening (73) of the intake-side flow path forming member (71) and the gap S1 on the front side of the screen (14) communicate with each other. The clearance S1 communicates with the front opening (78) of the exhaust side flow path forming member (76), and the exhaust side flow path is formed through the clearance S1 from the intake side opening (72) of the intake side flow path forming member (71). A front vent passage (70a) reaching the exhaust opening (77) of the member (76) is formed.

  Similarly, the rear opening (74) of the intake side flow path forming member (71) and the gap S2 on the back surface of the image display panel (12) communicate with each other, and the rear of the gap S2 and the exhaust side flow path forming member (76). The side opening (79) communicates and reaches the exhaust side opening (77) of the exhaust side flow path forming member (76) through the clearance S2 from the intake side opening (72) of the intake side flow path forming member (71). A rear vent passage (70b) is formed.

The front ventilation passage (70a) and the rear ventilation passage (70b) form a ventilation passage (70) for the housing (2).
The front ventilation passage (70a) mainly cools the screen (14) and the glass plate (25) of the image display panel (12) by the air flowing through the inside, and the rear ventilation passage (70b) The back surface of the image display panel (12) and the circuit board (16) are mainly cooled by the air flowing through the air.

Referring to FIG. 5, fan filter units (3) and (5) are attached to vertically long openings (26) and (27) formed on the left and right sides of the rear surface of the housing (2).
The intake-side fan filter unit (3) is attached to the right opening (26) as viewed from the rear side, and the exhaust-side fan filter unit (5) is attached to the left opening (27).

  As shown in FIGS. 6, 7 and 9, the intake-side fan filter unit (3) includes a plurality of fan units (30) (three in the drawing) and a plurality of filters inside the intake-side casing (34). The unit (40) (three in the figure) is accommodated.

  The fan unit (30) includes a fan (32) and an intake side fan drive mechanism (not shown) such as a motor that rotates the fan (32) (see FIG. 13 for electrical connection of the intake side fan drive mechanism (31)). Built in.

As shown in FIGS. 6, 7, and 9 to 11, the filter unit (40) is disposed upstream of the fan unit (34).
Referring to FIG. 9, the filter unit (40) is disposed in a filter casing (40a) accommodated in the intake side casing (34), and a part of the opening is formed in the back surface of the intake side casing (34). Projected from (34a).

  The filter casing (40a) has an air inlet (44) formed on the back surface, and has a pair of reels (42) and (43) on both sides of the air inlet (44), in FIG. Between the first reel (42) and the lower second reel (43), an intake side filter (41) is provided so as to cross the intake port (44).

  The intake side filter (41) has a belt-like shape and is wound around the first reel (42) and / or the second reel (43) as shown in FIGS. 10 and 11, and the end of the filter (41) The parts are mounted on reels (42) and (43), respectively. The filter (41) is preferably a fine filter that can collect dust.

  As shown in FIGS. 10 and 11, the first reel (42) and the second reel (43) are respectively connected to the reel shafts (42a) (43b) and the reel shafts (42a) (43a) penetrating the rotation center. The reel shaft (42a) (43a) has a drum (42b) (43b) fitted, and the drum (42b) (43b) is parallel to the inlet (44) at the upper and lower ends of the inlet (44). ) Are supported by bearings (45) and (45) attached to the filter casing (40a).

The first reel (42) has one end of a reel shaft (42a) connected to a first reel rotation mechanism (46) including a speed reduction mechanism (47) and a motor (48).
Similarly, the second reel (43) has one end of a reel shaft (43a) connected to a second reel rotation mechanism (46a) including a speed reduction mechanism (47) and a motor (48).
Each reel rotation mechanism (46) (46a) is electrically connected to a reel control unit (49) as shown in FIG. 13 to be described later, and based on a control command from the reel control unit (49), a filter is provided. The reels (42) and (43) are rotatable so that (41) can be fed forward or backward by a predetermined feed amount (for example, length).

  As shown in FIG. 11, a filter cleaning tool (400) is disposed between the reels (42) and (43) so that the tip protrudes from the traveling path of the filter (41). As shown in FIG. 10, the filter cleaning tool (400) is preferably provided at both ends of the air inlet (44).

  The filter cleaning tool (400) can be attached to the air inlet (44) of the filter casing (40a), and examples thereof include a brush, a metal blade, a resin or rubber spatula.

  Further, as shown in FIGS. 10 and 11, the tension of the filter (41) is held between the reels (42) and (43) so that the filter (41) is pressed against the filter cleaning tool (400). It is desirable to provide the guide (401) to do.

  The filter unit (40) configured as described above operates the first reel rotation mechanism (46) and the second reel rotation mechanism (46a), and the first reel (42) and the second reel (43) are moved as shown in FIGS. 11, the filter (41) wound around the first reel (42) is sent out between the reels (42) and (43). Further, the filter (41) attached with the dust stretched between the reels (42) and (43) is wound around the second reel (43). This traveling of the filter (41) is referred to as forward feeding.

  At this time, if dust (90) or the like adheres to the surface of the filter (41) on the side of the intake port (41), as shown in FIGS. 11 and 14, the filter (41) to be wound up. It is scraped by the pressed filter cleaning tool (400). Since the scraped dust (90) is discarded out of the air inlet (41), the wound filter (41) can be maintained in a clean state.

  The forward feed can be performed a plurality of times over the entire length or substantially the entire length of the filter (41).

  In addition, after the forward feed is executed over the entire length or substantially the entire length of the filter (41), the first reel rotating mechanism (46) and the second reel rotating mechanism (46a) are operated in the opposite directions, so that the first reel The filter (41) wound around the second reel (43) is sent between the reels (43) and (42) by rotating the (42) and the second reel (43) in the opposite direction. The Further, the filter (41) to which the dust stretched between the reels (42) and (43) adheres is wound around the first reel (42). This travel of the filter (41) is referred to as reverse feed.

  At this time, similarly to the above, the dust (90) adhering to the surface of the filter (41) on the intake port (41) side of the wound filter (41) is removed from the filter cleaning tool pressed against the wound filter (41) ( 400) (see FIGS. 11 and 14). The scraped dust (90) is discarded out of the intake port (41), so that the wound filter (41) can be in a clean state.

  The reverse feed can be performed a plurality of times over the entire length or substantially the entire length of the filter (41).

  By repeating the reciprocating operation consisting of the forward feed and the reverse feed a plurality of times, the cleaned filter (41) can be used a plurality of times, and the maintenance of the filter (41) can be made unnecessary over a long period of time. .

  The intake side casing (34) that houses the fan unit (30) and the filter unit (30) has a plurality of openings (36) that communicate with the intake side openings (72) of the intake side flow path forming member (71). The fan unit (30) is attached to each opening (36). In addition, the intake side casing (34) has openings (34a) and (34a) on the back surface, and the intake side filter unit (40) has an intake port (41) that projects from the opening (34a). It is inserted into the intake side casing (34).

  The intake-side fan filter unit (3) configured as described above operates the intake-side fan drive mechanism (31) so that the intake-side fan (32) rotates in the direction of sucking air from the intake-side filter (41). 7 As indicated by the arrow in the drawing, the air passage (70) passes from the outside of the housing (2) through the intake side filter (41) stretched between the intake port (44) and the reels (42) and (43). An air flow in the direction in which air is introduced into the air is generated.

  As will be described in detail later, by operating the intake side fan drive mechanism (31) in the reverse direction, as shown by the arrow in FIG. 14, the air in the direction of exhausting outward from the intake side filter (41) A flow can also be produced.

  As shown in FIGS. 6 and 8, the exhaust side fan filter unit (5) also houses a plurality of fan units (50) (three shown) and a filter (61) inside the exhaust side casing (54). is doing.

  The exhaust side casing (54) has a plurality of openings (56) communicating with the exhaust side openings (77) of the exhaust side flow path forming member (76), and fan units (50 ) And an exhaust port (64) in which a filter (61) is provided downstream of the fan unit (50).

  The fan unit (50) includes a fan (52) and an intake side fan drive mechanism (not shown) such as a motor that rotates the fan (52) (refer to FIG. 12 for electrical connection of the exhaust side fan drive mechanism (51)). Built in.

As shown in FIGS. 6 and 8, the exhaust side filter (61) is a filter that can collect dust in the air, but dust collection is not considered as important as the intake side filter (41). A filter or mesh that is coarser than the intake side filter (41) can be used.
The exhaust side filter (61) is less likely to collect dust than the intake side, so a configuration for winding the filter is not necessary, but if necessary, the exhaust side filter (61) can also be wound with a filter. You may provide the structure to make.

  Although it seems that no filter is required on the exhaust side, there is a possibility that dust may enter from the outside when the ventilation in the ventilation passage (70) is turned off, so this unit (10) Then, the filter (61) is adopted. However, when a fine filter such as the intake side filter (41) is employed, the speed is reduced at the filter portion, and there is a possibility that air flow in the ventilation passage (70) may be hindered. Therefore, it is optimal to use a coarse filter.

  The exhaust fan filter unit (5) configured as described above operates the exhaust fan drive mechanism (51) so that the exhaust fan (52) rotates in the direction of discharging air toward the exhaust filter (61). Thus, as shown by an arrow in FIG. 8, an air flow is generated in a direction in which the air inside the housing (2) is exhausted through the exhaust filter (61).

  By mounting the fan filter units (3) and (5) having the above-described configuration on the housing (2), the housing (2) has an intake port (44) to an exhaust port (64 as shown in FIGS. 6 to 8). ) To the ventilation passage (70).

  More specifically, the ventilation passage (70) operates the intake-side fan drive mechanism (31) in the suction direction of the fan (32) and the exhaust-side fan drive mechanism (51) in the discharge direction of the fan (52). By operating the intake side, the air is passed through the intake port (44), the intake side filter unit (40), and the intake side fan unit (30) from the outside of the housing (2), and the front side ventilation is formed by the intake side flow path forming member (71). Branching into the passage (70a) for the rear and the passage (70b) for the rear ventilation, and the heating elements such as the image display panel (12), the glass plate (25) and the circuit board (16) are cooled in the passage, The flow path forming member (76) joins to form a passage that is exhausted to the outside of the housing (2) through the exhaust side fan unit (50), the exhaust side filter (61), and the exhaust port (64). .

FIG. 13 is a block diagram of the fan filter units (3) and (5).
The reel rotation mechanism (46) (46a) for rotating the reel (42) (43) is electrically connected to the reel control unit (85) and its operation is controlled to rotate the fan (32) (52). The fan drive mechanisms (31) and (51) are electrically connected to the fan control unit (80) and their operations are controlled.
The reel control unit (85) and the fan control unit (80) can be provided at appropriate positions (for example, the circuit board (16)) inside the housing (2).

The reel controller (85) includes a drive circuit for the reel rotation mechanism (46) (46a), and further, as shown in FIG. 13, sensors (81), (82) for detecting the internal state of the housing (2). ) (83) and the memory (84) are electrically connected.
The fan control unit (80) includes drive circuits for the fan drive mechanisms (31) and (51).

  The reel control unit (85) and the fan control unit (80) are electrically connected.When the reel control unit (85) operates the reel rotation mechanism (46) (46a), the fan control unit ( 80) preferably receives the signal and can control the fan drive mechanisms (31) (51).

  As the above-described sensors, a temperature sensor (81) for acquiring temperature information of the image display panel (12), an intake side wind speed sensor (82) for acquiring speed information of air passing through the intake port (44), and an exhaust port (64 Exhaust-side wind speed sensor (83) that acquires speed information or air volume information of air passing through the air) can be exemplified.

  For example, the temperature sensor (81) can be provided in the vicinity of the image display panel (12) as shown in FIG. 6, and the intake side wind speed sensor (82) is shown in FIG. The exhaust side wind speed sensor (83) is disposed inside the exhaust side casing (34) of the exhaust side fan filter unit (5), as shown in FIG. 8, inside the intake side casing (34) of the filter unit (3). can do.

  The memory (84) stores various state quantities relating to a preset temperature and wind speed. The state quantity stored in the memory (84) is the temperature sensor (1) when the image display device (1) is first driven after the image display device (1) is installed at a certain position indoors or outdoors. The temperature information and the wind speed information acquired by 81) and the wind speed sensors (82) and (83) may be recorded as initial state quantities.

  Further, the memory (84) further includes a switching temperature and a switching wind speed to a filter purification mode in which the filter (41) is moved forward or backward to perform purification, an abnormal temperature for forcibly shutting down the image display device (1), and Abnormal wind speed is stored.

  The memory (84) may be able to record the time and number of times of transition to the filter purification mode, which will be described later, and the temperature and wind speed at that time.

  The reel controller (85) stores the state quantity acquired from the temperature sensor (81) and the wind speed sensors (82) and (83) and the memory (84) in a state where the image display device (1) is operated. The abnormal state relating to the cooling of the image display device (1), specifically, the clogging of the intake side filter (41) is detected and the filter rotation is performed in the filter purification mode as will be described later. The mechanism (46) (46a) is operated.

  Specifically, the reel control unit (85) detects that the temperature of the image display panel (12) or the like detected by the temperature sensor (81) is higher than a set temperature, or is detected by the wind speed sensors (82) (83). When it is determined that the wind speed at the intake port (44) or the exhaust port (64) is lower than the set speed, the filter rotation mechanism (46) (46a) is operated in the filter purification mode.

  If the detected temperature of the temperature sensor (81) and the detected wind speed of the wind speed sensors (82) (83) are not improved even if the filter rotation mechanism (46) (46a) is operated in the filter purification mode, fan control The unit (80) can be configured to forcibly cut off the energization of these in order to protect the image display panel (12) and the like.

<Normal mode>
When the image display device (1) is energized, the image display panel (12) and the like are energized, and the fan control unit (80) operates the fan drive mechanisms (31) and (51) to The fan drive mechanism (31) is operated in the suction direction of the fan (32), and the exhaust side fan drive mechanism (51) is operated in the discharge direction of the fan (52).

As a result, the air outside the housing (2) passes from the outside of the housing (2) through the intake port (44), the intake-side filter unit (40), and the intake-side fan unit (30) to the intake-side flow path forming member. (71) branches into the front ventilation passage (70a) and the rear ventilation passage (70b), and the image display panel (12), the glass plate (25), the circuit board (16), etc. generate heat in the passage. Heat exchange with the body, join at the exhaust side flow path forming member (76), pass through the exhaust side fan unit (50), the exhaust side filter (61) and the exhaust port (64), and then the housing (2) Exhausted outside.
As described above, clean air from which dust has been collected by the intake-side filter (41) flows through the ventilation passage (70), thereby cooling the heating element such as the image display panel (12).

<Filter purification mode>
When the image display device (1) is used for a long time, although it depends on the dust condition of the outside air, the intake side filter (41) is clogged with dust and the desired intake performance cannot be maintained.
The decrease in the intake performance results in a decrease in the cooling performance of the heating element such as the image display panel (12), and the operation and quality of the image display device (1) may be abnormal.

  Therefore, in the present invention, when the filter (41) is clogged, the filter (41) wound around one reel (eg, the first reel (42)) in the initial state is replaced with the other reel (eg, the second reel). The filter (41) is made to travel by a predetermined feed amount so as to be wound up by a reel (43) (forward feed or reverse feed), and simultaneously with running, the filter (41) is cleaned by the filter cleaning tool (400). This eliminates the clogging and makes it possible to use a plurality of reciprocating filters (41), thereby eliminating the need for maintenance over a long period of time.

  Clogging of the intake side filter (41) is detected as an increase in temperature or a decrease in wind speed detected by the temperature sensor (81) and the wind speed sensors (82) and (83). The reel control unit (85) compares these state quantities with the switching temperature and switching wind speed stored in the memory (84), and detects whether the detected temperature becomes abnormal or the detected wind speed on the intake side or exhaust side. Is less than the switching wind speed, it is determined that the filter (41) is clogged, and the filter rotation mechanism (46) (46a) is operated in the filter purification mode.

  In the filter purification mode, the reel control unit (85) sends out the filter (41) from one of the reels (42) and (43) by a predetermined feed amount, and takes up the filter rotation mechanism (46) ( Operate 46a).

For example, when the filter (41) is wound around the first reel (42) at first, if the clogging of the intake side filter (41) is detected by the sensors (81) (82) (83), the reel control The unit (49) operates the first reel rotating mechanism (46) and the second reel rotating mechanism (46a) for a predetermined time or for a time when the filter (41) is sent out by a predetermined feed amount, and thereby the first reel (42) is operated. ) And the second reel (43) are rotated in the direction indicated by the arrows in FIGS. 10 and 11 (forward feed). As a result, the clogged filter (41) facing the air inlet (44) has the dust (90) scraped out by the filter cleaner (400) as shown in FIGS. The clean filter (41) wound around the two reels (43) and wound around the first reel (42) faces the air inlet (44).
Thereby, the filter performance of the filter (41) can be recovered.

  While the filter (41) is running, the fan controller (80) receives the signal from the reel controller (85) and operates the fan drive mechanism (31) in the direction opposite to the intake air. Thus, it is desirable to perform an operation in a direction in which air is blown from the intake side fan (32) toward the filter (41). As a result, dust on the filter (41) can be removed more effectively, and dust can be prevented from staying in the filter cleaning tool (400).

In this case, it is desirable to stop the operation of the exhaust side fan drive mechanism (51).
When the exhaust fan drive mechanism (51) is operated in the direction of discharging from the exhaust port (64), the ventilation passage (70) becomes negative pressure, and the intake fan (32) to the intake filter (41). This is because the intake air filter (41) cannot be sufficiently cleaned.
Also, at this time, the exhaust side fan drive mechanism (51) can be rotated in the reverse direction to take in air from the exhaust port (64). The exhaust side filter (61) is clogged or coarse. Since dust flows from the exhaust filter (61) into the housing (2), it is desirable to stop the exhaust fan drive mechanism (51) as described above.

  When one forward feed is completed, the new or purified filter (41) faces the air inlet (44). Therefore, by operating the fan drive mechanism (31) (51) in the normal mode again, heat is generated. The body can be cooled.

  Each time the clogging of the filter (41) is detected, the above-mentioned forward feed is performed for the length of the filter (41) or a preset number of times, and then the first reel rotating mechanism (46) and the second reel are reversed. The reverse feed for operating the reel rotating mechanism (46a) in the same manner as described above may be performed for the length of the filter (41) or a preset number of times.

  By allowing the above operation to be performed the number of times corresponding to the life of the filter (41), the maintenance of the filter (41) can be made unnecessary until the reciprocating operation is performed a predetermined number of times.

  It should be noted that switching to the mode is preferably performed in a state where the image display device (1) is not used, that is, the image display panel (12) is not energized. This is to prevent the use of the image display device (1) from being hindered. In this case, it is stored in the memory (84) that the temperature detected by the sensors (81) (82) (83) is equal to or higher than the switching temperature, or the wind speed is equal to or lower than the switching wind speed, and the image display panel ( The mode switching may be performed in a state where the power supply to 12) is cut off.

  When the filter (41) is reciprocated a predetermined number of times, or even if forward or reverse feed is performed, the temperature detected by the sensors (81) (82) (83) is higher than the switching temperature, or the wind speed is lower than the switching wind speed. If this is the case, it can be visually notified to that effect.

  In addition, if the temperature detected by the sensors (81), (82), (83) is higher than the abnormal temperature or the wind speed is lower than the abnormal wind speed, before the filter purification mode is implemented, during or after the implementation. Regardless of the case, the power supply to the image display device (1) may be cut off. As a result, it is possible to prevent malfunctions and quality deterioration of the heating element such as the image display panel (12).

  In the above description, clogging of the filter (41) is detected based on the state quantities detected by the sensors (81), (82), and (83), and the filter purification mode is entered. You may make it transfer to filter purification mode every time, or you may make it transfer to filter purification mode based on the integration time of the operation time in normal mode.

  For example, if a filter (41) having a length capable of 10 forward feeds is wound around the first reel (42), it is set to shift to the filter purification mode once a month. The filter (41) can be used for months. Further, when the filter (41) is wound around the second reel (43), the filter (41) can be used for another 10 months by performing reverse feed 10 times.

Therefore, assuming that the life of the filter (41) is, for example, three reciprocations, the filter (41) can be used for 60 months, that is, 5 years.
For this reason, for example, if it is an electric equipment with a durable life of 5 years or less, it is not necessary to replace the filter (41).

  The structure of the fan filter units (3) and (5) is an embodiment for explaining the invention, and it goes without saying that these structures are not limited to the above.

  INDUSTRIAL APPLICABILITY The present invention is suitable for an electrical apparatus such as an image display device that can eliminate clogging of a filter and make the filter maintenance-free for a long period of time.

(1) Image display device
(10) Image display unit
(12) Image display panel
(16) Circuit board
(2) Case
(25) Glass plate
(3) Intake side fan filter unit
(30) Intake fan unit
(31) Intake side fan drive mechanism
(32) Intake fan
(40) Intake side filter unit
(41) Intake side filter
(42) 1st reel
(43) Second reel
(44) Air intake
(46) First reel rotation mechanism
(46a) Second reel rotation mechanism
(49) Reel controller
(5) Exhaust fan filter unit
(50) Exhaust fan unit
(51) Exhaust fan drive mechanism
(52) Exhaust fan
(61) Exhaust side filter
(64) Exhaust port
(70) Ventilation passage
(80) Fan controller

Claims (12)

A housing that houses the heating element;
A ventilation passage formed inside the housing for cooling the heating element by circulating air;
An intake port that connects the outside of the housing to the ventilation passage, sucks air outside the housing into the ventilation passage, an exhaust port that discharges air from the ventilation passage to the outside of the housing,
A filter unit for guiding air to the ventilation passage through the intake port;
An electrical device comprising
The filter unit
A pair of reels arranged on both sides of the air inlet and rotatable about an axis;
A filter having an end portion attached to each of the reels, wound around one or both of the reels, traversing so as to block the air inlet, and collecting dust contained in the passing air;
A filter cleaning tool disposed between the reels, contacting the filter, and scraping off dust adhering to the traveling filter;
A reel rotation mechanism that rotates one reel in the filter take-up direction when rotating the other reel in the filter feed direction;
A reel control unit for controlling the reel rotation mechanism;
With
The reel control unit sends out a filter from one reel by a preset feed amount and performs forward feeding to wind up to the other reel, and reverse feed to send out the filter from the other reel and wind up to one reel. Actuate the reel rotation mechanism,
Electrical equipment with a filter unit characterized by   The electrical equipment provided with the filter unit according to claim 1, wherein the filter cleaning tool is provided on each side of the intake port.   3. The electric device comprising the filter unit according to claim 1, wherein the reel control unit operates a reel rotation mechanism to perform the reverse feed a plurality of times after performing the forward feed a plurality of times.   The electric device comprising the filter unit according to claim 3, wherein the reel control unit operates the reel rotation mechanism to perform forward feed and reverse feed until the filter reciprocates a predetermined number of times.   The reel control unit is provided in the housing, and is electrically connected to a sensor that detects a state of the housing, and operates the reel rotation mechanism based on a state amount detected by the sensor. Item 5. An electrical device comprising the filter unit according to any one of Items 4 to 5.   6. The electrical apparatus comprising the filter unit according to claim 1, wherein the housing has a plurality of air inlets communicating with the ventilation passage, and the filter unit is disposed in each air inlet. . A fan that is arranged in the passage for ventilation and sucks air outside the housing from the air inlet;
A fan drive mechanism for rotating the fan;
A fan control unit for controlling the fan driving mechanism;
An electric device comprising the filter unit according to claim 1, comprising a fan unit having a filter.   The electric device including the filter unit according to claim 7, wherein the fan control unit stops the operation of the fan drive mechanism during the operation of the reel rotation mechanism.   The electric device including the filter unit according to claim 7 or 8, wherein the fan control unit operates the fan drive mechanism in a direction in which the fan discharges air from the air intake port during the operation of the reel rotation mechanism. A pair of reels rotatable about an axis, and
A filter having an end portion attached to each of the reels, wound around one or both of the reels, traversing so as to block the air inlet, and collecting dust contained in the passing air;
A filter cleaning tool disposed between the reels, contacting the filter, and scraping off dust adhering to the traveling filter;
A reel rotation mechanism that rotates one reel in the filter take-up direction when rotating the other reel in the filter feed direction;
A reel control unit for controlling the reel rotation mechanism;
With
The reel control unit sends out a filter from one reel by a preset feed amount and performs forward feeding to wind up to the other reel, and reverse feed to send out the filter from the other reel and wind up to one reel. Actuate the reel rotation mechanism,
Filter unit characterized by   The filter unit according to claim 10, wherein the reel control unit operates a reel rotation mechanism to perform the reverse feed a plurality of times after performing the forward feed a plurality of times.   The filter unit according to claim 11, wherein the reel control unit operates the reel rotation mechanism to perform forward feed and reverse feed until the filter reciprocates a predetermined number of times.

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