JP5119507B2 - Dust collector and dust collection method - Google Patents

Description

The present invention is used in an electronic device comprising a heating element such as heating component relates dust collection instrumentation 置及 beauty precipitator method air for cooling the heat generating component to pass through.

  In an electronic device including a cooling fan that sends air to the inside, an air filter is used to prevent dust from entering the inside. The air sucked from the outside of the electronic device passes through the air filter, and the air after the dust is removed is blown to the heat generating component to cool the heat generating component. The general structure is that an air filter is attached to the intake louver provided on the outer periphery of the housing, and external air sucked from the intake louver passes through the air filter and is sent into the electronic equipment. It is.

  In general, the dust removal performance of the air filter increases as the eyes of the air filter become finer. However, when an air filter with a fine mesh is used to improve the dust removal performance, the air filter is likely to be clogged. Similarly, even when a large amount of air is required to cool the inside of the electronic device, the air flow rate through the air filter is increased, so that the air filter is easily clogged. And when an air filter is clogged, the air taken in from the outside reduces and the air volume blown to a heat-emitting component decreases. As a result, there is a risk that the mounting components will deteriorate or break down as the temperature of the heat generating components rises.

  Therefore, a measure is taken to stop the operation of the electronic device when the internal temperature reaches a predetermined temperature by detecting the temperature inside the electronic device using a thermistor. In addition, measures are taken to detect the clogging of the air filter by detecting the wind speed passing through the air filter and to prompt the user to clean the air filter. Moreover, the following patent documents 1-5 are disclosed as a prior art for avoiding the stop of the drive of an electronic device or saving the effort of the cleaning operation of an air filter.

  Patent Document 1 discloses a communication device including a dust collecting device that sucks dust attached to an air filter with a suction nozzle connected to a compressor. In recent years, a similar configuration has been put to practical use as a filter cleaning mechanism of an air conditioner (air conditioner).

  Patent Document 2 discloses a cleaning device having a configuration in which dust attached to an air filter is blown away by passing air in a direction opposite to the intake direction. The configuration described in Patent Document 2 is a configuration including a motor that rotates the position of the air filter by the motor, and a complicated mechanism such as the nozzle moving mechanism included in the configuration of Patent Document 1 described above is unnecessary.

  Patent Document 3 discloses a technique related to an air filter disposed in a vacuum cleaner. In the configuration of Patent Document 3, the air filter formed in a cylindrical shape is rotated, and the air filter is vibrated using a striking body provided on the peripheral surface of the air filter, or centrifugal force or air filter acting on the air filter is used. It is the structure which removes the dust adhering to an air filter with the airflow produced by this rotational movement.

  Patent Document 4 discloses a configuration of a filter unit included in an air cleaner. In this air purifier, after collecting a relatively large amount of dust by a cyclone method, a relatively small fine dust is collected by a cylindrical air filter having a fine structure. In patent document 4, since the cyclone method is adopted, the flow of air after collecting dust is the entire circumferential direction of the air filter, and the air filter is formed in a cylindrical shape, so that the flow of air is reduced. Loss is small and can be collected efficiently.

  Patent Document 5 discloses a dust collection unit included in a vacuum cleaner. This dust collection unit discloses a configuration in which cyclone type dust collection and dust collection by an air filter are combined.

JP 2007-194264 A JP 2006-73919 A JP 2009-5799 A JP 2006-289171 A JP 2004-167207 A

  In the configuration described in Patent Document 1, since the air filter is cleaned by moving the suction nozzle along the entire surface of the air filter, it is necessary to provide a mechanism for moving the suction nozzle, resulting in an increase in the size of the entire dust collector. There is.

  In the configuration of Patent Document 1, it is possible to clean the air filter without stopping the operation of the communication device. However, since the suction nozzle becomes an obstacle to air suction during filter cleaning, cooling of the communication device is performed. The ability will be reduced. For this reason, it is desirable to stop the operation of the electronic device when cleaning the air filter. When the air filter cleaning operation is performed without stopping the operation of the communication device, the temperature of the electronic component may increase rapidly, leading to a problem of deterioration of the electronic component. Therefore, this configuration is not suitable for an electronic device that requires continuous operation for 24 hours, such as a projection display device for monitoring applications.

  Furthermore, the compressor used as the suction source of the intake nozzle in the configuration of Patent Document 1 has a problem that vibration is likely to occur and noise is large.

  Further, in the configuration described in Patent Document 2, since there is a structural restriction that it is necessary to arrange the air blowing paths on the intake side and the exhaust side at positions adjacent to each other, the degree of freedom in designing the device is impaired. . Moreover, in the structure of patent document 2, since an air filter is rotated centering | focusing on the rotating shaft of a motor, there exists a problem that an air filter will become large and will cause the enlargement of an apparatus.

  Further, in the configuration described in Patent Document 3, an air filter formed in a cylindrical shape is provided. However, in the same manner as the dust removing method of Patent Document 2 described above, the air filter is rotated to remove dust. is there. For this reason, also in the structure of patent document 3, an air filter will become large and there exists a problem similar to the above that causes the enlargement of an apparatus.

  In the configuration of Patent Document 4, when the air filter is clogged, it is necessary to replace the air filter. When replacing the air filter, it is necessary to temporarily stop the operation of the electronic device, and there is a problem that the continuous operation is interrupted.

  The configuration described in Patent Document 5 is the same as that described in Patent Document 4 described above. Therefore, also in patent document 5, when the air filter is clogged, it is necessary to replace the air filter as in the configuration of patent document 4, and there is a problem that continuous operation of the electronic device is interrupted.

An object of the present invention is to provide a dust collection instrumentation 置及 beauty precipitator method that can solve the above related art problems. An example of the purpose is to enable the cooling fan to continue to send air to the heating element even when the air filter is clogged, thereby extending the continuous operation time of the electronic device. Another object is to reduce the size of the dust collector and to suppress noise from the cooling fan.

A dust collector according to one aspect of the present invention has a structure having an intake port and an exhaust port, and a collection surface disposed between the intake port and the exhaust port along the ventilation direction to accumulate dust. first and second air filters capable of formed elastically deformed in a tubular shape, and the first and second supports the first and second air filter respectively supporting the first and second air filter And a cooling fan that sends air that has passed through the heating element. When the first and second air filters are elastically deformed, the size of the eyes of the collection surface changes. The first air filter is disposed on the inner periphery of the second air filter. The first support is detachably supported by the second support. The second support is detachably supported by the structure.

  In addition, the dust collection method according to the present invention sends air that has passed through an elastically deformable air filter having a collection surface on which dust is accumulated to the heating element, and elastically deforms the air filter, thereby The size of the eyes is changed, and a part of the dust accumulated on the collecting surface passes through the air filter.

It is a perspective view which shows the projection type display apparatus of 1st Embodiment. It is a disassembled perspective view which shows the inside of the projection type display apparatus of 1st Embodiment. It is a disassembled perspective view which shows the dust collection unit with which the projection type display apparatus of 1st Embodiment is provided. It is a disassembled perspective view which shows the internal structure of the dust collection unit with which the projection type display apparatus of 1st Embodiment is provided. It is a perspective view which shows the dust collection unit in 1st Embodiment. It is a perspective view which shows the dust collection unit in 1st Embodiment. It is a perspective view which shows the dust collection box and intake louver which the dust collection unit in 1st Embodiment has. It is a cross-sectional view which shows the dust collection unit in 1st Embodiment. It is a longitudinal cross-sectional view which shows the dust collection unit in 1st Embodiment. It is a disassembled perspective view which shows the dust collection unit in 1st Embodiment. It is a perspective view which shows the 2nd filter support frame with which the dust collection unit in 1st Embodiment is provided. It is a perspective view showing the state where the 2nd air filter was attached to the 2nd filter support frame. It is a cross section for demonstrating operation | movement of the dust collection unit in 1st Embodiment. It is a perspective view which shows the structural example of an intake louver. It is a perspective view which shows the projection type display apparatus of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of the projection display apparatus according to the first embodiment. As shown in FIG. 1, an intake louver 20 that takes air into the housing 6 is disposed on the side surface of the housing 6 included in the projection display device 1 of the first embodiment. The configuration is the same as that of a simple projection display device. The intake louver 20 is formed in a shape having a large slit in terms of appearance design, but the opening area of the intake opening provided inside the intake louver 20 is the intake louver 20 provided in a general projection display device. The opening area is less than half. For this reason, noise inside the housing 6 is prevented from leaking from the intake opening of the intake louver 20 to the outside of the housing 6.

  FIG. 2 shows a perspective view of the projection display device 1 according to the embodiment with the upper portion of the housing 6 removed. In FIG. 3, the disassembled perspective view for demonstrating the internal structure of the projection type display apparatus 1 of embodiment is shown.

  As shown in FIGS. 2 and 3, the projection display device 1 includes a projection lens 11 that projects a projected image, an optical engine 12, a lamp unit 13, a power supply unit 14, and a main board 15, and is mounted components. It comprises a plurality of cooling fans including an exhaust fan 16 for cooling the air. As shown in FIG. 3, the projection display device 1 includes a dust collection unit 3 that removes dust from the air sent into the housing 6. The dust collection unit 3 is mounted in the vicinity of the opening 6a located on the side surface (the rear left side surface portion) of the housing 6 opposite to the one side surface on which the projection lens 11 is provided. The image generation component in the optical engine 12 is cooled by the air that has passed through the dust collection unit 3.

  FIG. 4 shows an exploded view of the internal structure of the dust collection unit 3. At the time of replacement of the air filter, as shown in FIG. 4, the intake louver 20 is removed from the opening 6 a of the housing 6, and replacement work of the air filters 26 and 27 of the dust collection unit 3 is performed. First, the intake louver 20 is removed from the housing 6, and then the knobs 28c and 29c provided on the flange portions 28b and 29b of the filter support frames 28 and 29 are grasped, and the air filters 26 and 27 are pulled out and projected. The mold display device 1 is taken out from the inside.

  FIG. 5 is a perspective view for explaining a duct configuration for cooling the mounted parts by the dust collection unit 3 of the projection display device 1.

  As shown in FIG. 5, the red (R) cooling fan 31 (hereinafter referred to as the first cooling fan 31) and the green-blue (GB) cooling fan 32 (hereinafter referred to as the second cooling) constituting the dust collection unit 3. The air outlet of the fan 32 is communicated with the liquid crystal display (LCD) section air duct 18. In this configuration, the air volume is distributed according to the structure of the internal partition plate (not shown) of the LCD unit air duct 18, and the cooling air blows up substantially vertically from the opening provided on the upper surface of the LCD unit air duct 18. It is done. An optical member which is an LCD unit as a heat generating element to be cooled is disposed above the LCD unit air duct 18, and the LCD unit is cooled by the cooling air blown from the opening of the LCD unit air duct 18. . The air that has cooled the LCD unit then flows to cool the main board 15 and other heat-generating components such as the light source lamp of the lamp unit 13, and is exhausted to the outside of the housing 6 by the exhaust fan 16.

  Next, the detail of a structure of the dust collection unit 3 in 1st Embodiment is demonstrated. In FIG. 6, the perspective view of the dust collection unit 3 with which the projection type display apparatus 1 of this embodiment is provided is shown.

  As shown in FIGS. 4 and 6, the dust collection unit 3 of the present embodiment flows dust from the intake louver 20 into which external air mixed with dust is sucked and air sucked through the intake louver 20, and collects dust. And a dust collection box 21 to be removed. The dust collection box 21 is formed in a box shape, and has an intake port 23 for taking in air, and first and second exhaust ports 24a and 24b for exhausting air taken in from the intake port 23. Yes. The dust collection box 21 has an inlet port 23 formed at the open end, and circular first and second exhaust ports 24a and 24b are formed opposite to each other on a pair of side surfaces.

  Further, the dust collection unit 3 includes the first and second air filters 26 and 27 that have elastic collecting surfaces 33 and 34 on which dust is accumulated, and the first and second air filters 26 and 27. First and second filter support frames 28 and 29 as support bodies for supporting the collecting surfaces 33 and 34 from the upstream side of the air filters 26 and 27, and the first and second air filters 26 and 27 are passed. And first and second cooling fans 31 and 32 for sending the air to the LCD unit.

  The first and second air filters 26 and 27 are disposed between the intake port 23 and the exhaust ports 24a and 24b. In the first and second air filters 26 and 27, when the collecting surfaces 33 and 34 facing the exhaust ports 24a and 24b are clogged, the entire collecting surfaces 33 and 34 on the same surface face the downstream side. The first and second filter support frames 28 and 29 are supported so as to be elastically deformable so as to swell. That is, when the first and second air filters 26 and 27 are elastically deformed, the size of the eyes of the collection surfaces 33 and 34 changes.

  The first and second air filters 26 and 27 and the first and second filter support frames 28 and 29 are arranged inside the dust collection box 21, respectively. The first and second exhaust ports 24 a and 24 b are provided on the surface of the dust collection box 21 that faces the collection surfaces 33 and 34. Moreover, each exhaust port 24a, 24b is formed in the position which the opening area is formed smaller than the collection surfaces 33 and 34, and opposes the center part of the collection surfaces 33 and 34 of the dust collection box 21. As shown in FIG.

  The first cooling fan 31 and the second cooling fan 32 are arranged to face both side surfaces of the dust collection box 21. The suction ports of the first cooling fan and the second cooling fans 31 and 32 are communicated with the first and second exhaust ports 24 a and 24 b of the dust collection box 21. The pair of first cooling fan 31 and second cooling fan 32 sucks air from which dust has been removed by the first and second air filters 26 and 27 from the first and second exhaust ports 24a and 24b. Then, it is sent to the LCD unit through the LCD unit air duct 18.

  FIG. 7 shows a perspective view of the dust collection box 21 with the first cooling fan 31 and the second cooling fan 32 arranged opposite to both sides of the dust collection box 21 removed from the dust collection box 21. FIG. 8 shows a perspective view of the dust collection unit 3 cut along a horizontal plane including the central axis of the dust collection box 21.

  As shown in FIGS. 7 and 8, the inside of the dust collection box 21 is provided with a first filter support frame 28 and a second filter support frame 29 having a cylindrical cage frame structure. The first filter support frame 28 and the second filter support frame 29 respectively support the first air filter 26 and the second air filter 27 that are formed in a rectangular tube shape by a porous material such as sponge. It has a double structure.

  That is, the air that has flowed in through the intake louver 20 from the outside of the dust collection unit 3 passes through each square tube-shaped first air filter 26 supported by the first filter support frame 28 arranged on the inside. (Collecting dust at the first stage) After passing through the second air filter 27 having a rectangular tube shape supported by the second filter support frame 29 (collecting dust at the second stage), The circular first exhaust port 24a and the second exhaust port 24a provided on the side surface of the dust collection box 21 are divided along the inner wall surface of the dust collection box 21 toward the first exhaust port 24a and the second exhaust port 24b. 2 exhaust port 24b. These air flows are generated by the first exhaust port 24 a and the second exhaust port generated by the intake force of the pair of first cooling fan 31 and second cooling fan 32 provided on both sides of the dust collection box 21. It is made by the differential pressure between the pressure by 24b and the outside. As the first cooling fan 31 and the second cooling fan 32 provided in the dust collection unit 3 of the present embodiment, sirocco fans (multi-blade fans) of the same size are used. The first cooling fan 31 and the second cooling fan 32 sandwich the air filters 26 and 27 disposed in the dust collection box 21 so that the suction ports of the cooling fans 31 and 32 face each other. The static pressure is set to about 35 mmAq.

  FIG. 9 is a perspective view of the dust collection unit 3 cut along a vertical plane including the central axis of the dust collection box 21. With reference to FIG. 9, a double-structured filter support structure will be described.

  As shown in FIG. 9, the second filter support frame 29 that supports the square tube-shaped second air filter 27 includes a flange portion 29b, which will be described later, formed at one end portion on the intake louver 20 side, and a dust collection box. The protrusions formed on the flange portion 21a of the 21 are positioned by an uneven fitting structure.

  Further, the other end of the second filter support frame 29 is provided with two filter support protrusions 37, which will be described later, formed at two locations in the vertical direction in FIG. Each filter support hole 38 is inserted and positioned and fixed. Similarly, the support structure of the first air filter 26 is a protrusion structure of the flange portion 29b of the second filter support frame 29 that supports the second air filter 27, and a support structure of the filter support protrusion 37 and the filter support hole 38. And have.

  FIG. 10 is an exploded perspective view of the components in the dust collection box 21 cut along a vertical plane including the central axis of the dust collection box 21. First, a structure in which the second filter support frame 29 is fixed to the dust collection box 21 will be described.

  As shown in FIG. 10, the second filter support frame 29 has two filter support holes 38 provided in the bottom surface portion of the dust collection box 21 and two filter support frames 29 provided in the bottom portion of the second filter support frame 29. The filter support projection 37 is engaged and positioned and fixed. At the same time, as shown in FIG. 9, the convex projections formed in a rectangular frame shape provided on the flange portion 21 a of the dust collection box 21 and the flange portion 29 b of the second filter support frame 29 are provided. Further, the groove is positioned and fixed by fitting with a concave groove formed in a square shape.

  Next, a structure in which the first filter support frame 28 is fixed inside the second filter support frame 29 will be described.

  The first filter support frame 28 is engaged with a filter support hole 36 provided at the bottom of the second filter support frame 29 and a filter support protrusion 35 provided at the bottom of the first filter support frame 29. Positioning and fixing. At the same time, a convex protrusion formed in a square frame shape provided on the flange portion 29b of the second filter support frame 29 and a square shape provided on the flange portion 28b of the first filter support frame 28. It is positioned and fixed by fitting with the concave groove formed in. After the first and second filter support frames 28 and 29 that support the first and second air filters 26 and 27 are fixed, the intake louver 20 is attached to the frame portion of the flange portion 21a of the dust collection box 21. Positioned and fixed.

  11 shows a perspective view of the second filter support frame 29, and FIG. 12 shows a perspective view of the second filter support frame 29 with the second air filter 27 attached thereto. For convenience, only the configuration of the second filter support frame 29 disposed on the outside will be described. However, the configuration in which the first filter support frame 28 supports the first air filter 26 as shown in FIG. The same as the second filter support frame 29.

  As shown in FIG. 11, the second filter support frame 29 has a cage-shaped frame portion 29 a that supports the second air filter 27, and a flange portion 29 b that is supported by the dust collection box 21. .

  A square frame-shaped bottom is formed at a position on the opposite side of the flange 29b of the frame 29a. In order to position the second filter support frame 29 with respect to the dust collection box 21 on this bottom. A convex filter support protrusion 37 is provided. Further, a filter support hole 36 for positioning the first filter support frame 28 with respect to the second filter support frame 29 is provided at the bottom. A square tube-shaped second air filter 27 is supported at a predetermined position on the outer peripheral portion of the frame portion 29a. The frame portion 29a plays a role of collecting dust by the second air filter 27 by allowing air with dust flowing in from the opening in which the flange portion 29b is formed to pass from the inside to the outside.

  The flange portion 29b is formed around the opening of the frame portion 29a, and knobs 29c for taking out the filter structure portion from the dust collection box 21 are provided on both sides of the opening portion of the frame portion 29a. Yes. On the other hand, a concave groove for positioning the second filter support frame 29 at a predetermined position in the dust collection box 21 is provided on the back surface of the flange portion 29b. This groove is formed in a rectangular frame shape along the outer periphery of the flange portion 29b.

  The first filter support frame 28 disposed inside the second filter support frame 29 is also similar in basic structure to the second filter support frame 29, and therefore only the differences will be described.

  Similarly, the first filter support frame 28 has a frame portion 28a that supports the first air filter 26, and a flange portion 28b that is supported by the dust collection box 21 via the flange portion 29b of the second filter support frame 29. And have. A square frame-shaped bottom portion is formed at a position opposite to the flange portion 28 b of the frame portion 28 a of the first filter support frame 28, and the second filter support frame 29 is formed on this bottom portion. A convex filter support projection 35 for positioning the first filter support frame 28 is provided.

  As described above, since the first and second filter support frames 28 and 29 are detachably supported by the dust collection box 21, respectively, the first and second filter support frames 28 and 29 are attached to the dust collection box. 21 can be easily removed and replaced.

  The first and second air filters 26 and 27 supported by the first and second filter support frames 28 and 29, respectively, are formed in a rectangular tube shape with one end side closed. It has collection surfaces 33 and 34, respectively. The first and second air filters 26 and 27 are disposed outside the frame portions 28a and 29a of the first and second filter support frames 28 and 29, and are upstream of the frame portions 28a and 29a. It is supported from.

  Therefore, the first and second air filters 26, 27 have a collection surface 33, 34 as compared with a collection surface of a general flat air filter supported in parallel with the opening surface of the intake louver 20. The total area is equivalent to about 5 times. For this reason, the time required for clogging is extended by about five times, and the ventilation resistance for the cooling fans 31 and 32 to suck in air from the outside is reduced.

  Moreover, the dust collected on the collection surfaces 33 and 34 (the upstream surfaces in the ventilation direction) of the first and second air filters 26 and 27 is accumulated inside the rectangular tube. . Therefore, since the collection surfaces 33 and 34 of the first and second air filters 26 and 27 are separated from the intake surface of the intake louver 20, the first and second air filters 26 and 27 are separated from each other as in the configuration using a general air filter. The dust collected by the second air filters 26, 27 can be prevented from spilling from the intake louver 20. For this reason, even when the projection display device 1 is used for a long time, the intake louver 20 constituting a part of the housing is contaminated with dust collected by the first and second air filters 26 and 27. Is avoided.

  Moreover, in the dust collection unit 3 in this embodiment, since dust is accommodated inside the rectangular tube-shaped air filters 26 and 27, the respective collecting surfaces 33 and 34 of the first and second air filters 26 and 27 are stored. And the opening area of the intake louver 20 are not correlated. That is, there is no direct relationship between the opening area of the intake louver 20 and the time taken until the first and second air filters 26 and 27 are clogged.

  Therefore, the opening area of the intake opening of the intake louver 20 can be made small, and noise such as the cooling fans 31 and 32 generated in the projection display device 1 is confined in the housing 6, so that the housing 6 Noise that leaks to the outside can be reduced. In addition, by arranging the square tubular first and second air filters 26, 27 in a double structure, the porous structure of each air filter 26, 27 has a sound absorbing effect, and in particular, a noise component having a frequency of 1 kH or more. Can be reduced. Compared to a general structure in which a flat plate-like air filter is attached in parallel with the intake opening of the intake louver 20, according to the present embodiment, noise can be reduced by about 3 dB.

  FIG. 13A is a transverse cross-sectional view schematically showing one dust outlet 21b side of the dust collection box 21 by cutting the dust collection unit 3 along a horizontal plane. In FIG. 13, a broken line indicates the flow of air, and a black circle indicates dust. As shown in FIG. 13A, the air with dust, which is sucked from the outside of the dust collection unit 21 through the suction louver 20, enters the inside from the opening of the first filter support frame 28. The first air filter 26 disposed inside the second air filter 27 has a relatively coarse mesh, a cell size of 30 cells / inch, and a thickness of 2 mm. The second air filter 27 disposed outside the first air filter 26 has a relatively fine mesh, a cell size of 50 cells / inch, and a thickness of 2 mm. That is, the diameter of the cell constituting the second air filter 27 arranged on the downstream side is smaller than half the cell of the first air filter 26 arranged on the upstream side, and the second air filter 27 is As compared with the first air filter 26, finer dust is collected.

  That is, the air with dust first collects dust M having a medium diameter of about 500 μm to 850 μm by the first air filter 26. Next, the air that has passed through the first air filter 26 collects small-diameter dust S having a size of 500 μm or less by the second air filter 27. As described above, the first and second air filters 26 and 27 have a total area of the collection surfaces 33 and 34 that is five times that of the collection surface of the air filter arranged parallel to the intake surface of the intake louver. To a large extent. In the dust collection unit 3, dust M having a size larger than the medium diameter is first removed, and then dust collection is performed in two stages of removing the dust S having a size from the small diameter to the medium diameter. The total area where dust can be collected is secured approximately 10 times.

  Next, when the first and second air filters 26 and 27 are clogged, a part of the dust collected on the collecting surfaces 33 and 34 of the first and second air filters 26 and 27. A mechanism for preventing clogging of the first and second air filters 26 and 27 by actively releasing air and avoiding a significant decrease in the amount of cooling air sent by the cooling fans 31 and 32 will be described. .

  FIG. 13B shows a case where the collection surfaces 33 and 34 of the first and second air filters 26 and 27 start to clog when the dust collection unit 3 of the present embodiment is used for a long time. The deformation | transformation state of the collection surfaces 33 and 34 of each air filter 26 and 27 is shown typically. Since the dust collection unit 3 is formed using a porous sponge filter having a thickness of 2 mm as the first and second air filters 26 and 27, it can be elastically deformed relatively easily by an external stress. In addition, the first and second air filters 26 and 27 have the collecting surfaces 33 and 34 facing the first and second exhaust ports 24 a and 24 b of the first and second filter support frames 28 and 29. It extends along the outer periphery, and the collection surfaces 33 and 34 are formed so as to be easily elastically deformable.

  That is, in this embodiment, when clogging of the first and second air filters 26 and 27 begins to occur, the surfaces on the exhaust ports 24a and 24b side and the inner surfaces of the air filters 26 and 27 are arranged. The pressure difference increases. Due to this pressure difference, as shown in FIG. 13 (b), the entire collecting surfaces 33, 34 on the same surface of the air filters 26, 27 swell and elastically deform. As a result, the size of the eyes constituting the elastically deformed collection surfaces 33, 34, that is, the size of the cells changes slightly, so that already collected dust is discharged from the collection surfaces 33, 34, and each air Passes through filters 26 and 27. For this reason, the clogged state of the collection surfaces 33 and 34 of the air filters 26 and 27 is reduced. At this time, dust emitted from the collection surfaces 33 and 34 flows into the projection display device 1. Although the first and second air filters 26 and 27 include five collection surfaces 33 and 34, of the five collection surfaces 33 and 34, the collection facing the exhaust ports 24 a and 24 b. The collecting surfaces 33 and 34 are effectively elastically deformed so as to bend toward the exhaust ports 24a and 24b on the same plane.

  After the collection surface 34 of the second air filter 27 is elastically deformed, the second air filter 27 collects dust M having a medium diameter or larger. Such elastic deformation of the collecting surface 34 occurs in substantially the same manner in each of the air filters 26 and 27 arranged in a double structure. For this reason, also in the 1st air filter 26, after the collection surface 33 elastically deforms, the 1st air filter 26 makes large diameter dust whose magnitude | size is 850 micrometers or more to collection object. Accordingly, the collecting surface 33 of the first air filter 26 arranged on the upstream side always collects dust having a size larger than the collecting surface 34 of the second air filter 27 arranged on the downstream side. Will not change.

  Note that one side of the collection surface 34 of the second air filter 27 in this embodiment is a 4 cm square, and is deformed to a slightly larger 6 cm square with elastic deformation caused by pressure changes on the upstream side and the downstream side. At this time, the diameter of the cell is 1.5 times, and the diameter of the dust to be collected is also about 1.5 times. That is, the outer second air filter 27 shifts to the role that the inner first air filter 26 has been playing up to that time. That is, the second air filter 27 collects dust M having a medium diameter or larger.

  In the present embodiment, the best mode is shown, and as another embodiment, a multi-layer structure is further included rather than a double structure. In addition, as a multiple structure, a structure in which a plurality of air filters are arranged in a direct overlapping manner and the plurality of air filters are supported on a filter support frame is also exemplified. In the present embodiment, when the amount of dust in the environment where the projection display device 1 is used is relatively small, the inner first filter support frame 28 is removed and only the second air filter 27 is attached. The dust collection unit 3 may be used in the state. Further, the dust collection unit 3 itself may be configured to include only one air filter.

  In the present embodiment, the cooling fans 31 and 32 are arranged at positions close to the air filters 26 and 27, but ducts extended from the exhaust ports 24 a and 24 b of the dust collection box 21 are used. As long as the cooling fan is connected to the cooling fan, the cooling fan functions in the same manner even if the cooling fan is arranged at another position. However, the position of the exhaust port of the dust collection box must be arranged on a surface other than the surface perpendicular to the collection surface that is elastically deformed in the air filter configured in a rectangular tube shape, that is, on the surface facing the collection surface. is there. In particular, the position of the exhaust port of the dust collection box is preferably arranged at a position facing the central portion of the collection surface that is elastically deformed. With this configuration, the entire collecting surfaces 33 and 34 can be elastically deformed so as to bend and swell well on the same surface. In the dust collection box, four exhaust ports are formed at positions facing the four collection surfaces in the longitudinal direction of the rectangular tube-shaped air filter so that the four collection surfaces are flush with each other. You may make it the structure which carries out elastic deformation so that it may each curve above. In the case of this configuration, each exhaust port of the dust collection box communicates with the intake port of each cooling fan via a duct.

  The dust collector according to the present invention can be widely applied to electronic devices in general. However, since the heat generation density of the liquid crystal display panel is relatively high, a high effect can be obtained in a liquid crystal projection display device. A relatively large amount of cooling air is blown to the mounting component having a relatively high heat generation density, and the reduction of the cooling air greatly affects the temperature rise of the mounting component. In a general projection display device, when the air filter is clogged, the amount of air blown by the cooling fan is greatly reduced, and the temperature of the optical parts such as the liquid crystal display plate and polarizing plate of the LCD unit is 40 ° C. or higher. May rise. As the temperature rises, the deterioration of optical components may progress, and the hue of the projected image may change. Even in the case where the air filter is clogged in this way, in the present embodiment, among the dust collected on the collecting surfaces 33 and 34 of the air filters 26 and 27, the dust S having a relatively small diameter is positively collected. , The ventilation of the air filters 26 and 27 is ensured, and the cooling air blowing state by the cooling fans 31 and 32 is maintained. As a result, small-diameter dust S of 500 μm or less is released from the collection surface 34 of the second air filter 27, and the small-diameter dust S adheres to the LCD unit. For this reason, although the brightness of a projection image falls a little, the change of the color temperature (hue) of a projection image can be prevented. That is, in the present embodiment, the reason why the cooling fans 31 and 32 are operated to keep the air blown by discharging dust from the collecting surfaces 33 and 34 when the air filters 26 and 27 are clogged is that This is because the emphasis is on preventing changes in the hue of the projected image rather than reducing the brightness slightly. The small-diameter dust discharged into the projection display device 1 is cleaned by performing a separate maintenance operation after the desired continuous operation time has ended.

  In FIG. 14, the enlarged view of the structural example of the intake louver 20 with which the projection type display apparatus of embodiment is provided is shown. In this embodiment, the opening area of the intake opening of the intake louver 20 is about half of the opening area of a general intake louver. For this reason, the flow velocity of the air that the intake louver 20 takes in from the outside is also almost doubled (2 m / s). As a result, for example, paper such as printed matter placed around the projection display device 1 may stick to the intake opening of the intake louver 20 and block the intake, so that it may not be possible to intake air. Therefore, as shown in FIG. 14, the intake louver 20 in the present embodiment is preferably provided with a pair of rectangular protrusions 20b and 20c along the outer periphery at both ends of the slit 20a. As a result, even when paper is stuck to the intake louver 20, a gap is secured between the projections 20b, 20c and the paper, and intake can be performed from the gap.

  As described above, according to the projection display device 1 of the present embodiment, the collection surfaces 33 and 34 of the first and second air filters 26 and 27 are clogged by providing the dust collection unit 3. In this case, a part of the dust collected on the collecting surfaces 33 and 34 can be released by the pressure difference generated between the front and back surfaces of the collecting surfaces 33 and 34. Therefore, this embodiment can reduce the clogged state of the air filters 26 and 27, and can avoid that the air volume by the cooling fans 31 and 32 reduces significantly. For this reason, the time taken until the air filters 26 and 27 are clogged can be remarkably extended, and the continuous operation time of the projection display device 1 can be extended.

  In other words, the projection display device 1 can reduce the deterioration and failure of the mounting component due to the temperature rise of the mounting component. Further, since the first and second air filters 26 and 27 are formed in a rectangular tube shape, dust adhering to the collection surfaces 33 and 34 can be prevented from spilling from the intake louver 20 to the outside of the housing 6. . Further, the dust collection unit 3 has a configuration in which the first and second air filters 26 and 27 are formed in a rectangular tube shape, and the first air filter 26 is disposed inside the second air filter 27. The dust collecting unit 3 can be reduced in size, and noise from the cooling fans 31 and 32 can be suppressed.

(Second Embodiment)
FIG. 15 is a perspective view of the projection display apparatus according to the second embodiment. The projection display device of the second embodiment is different from a general projection display device in that a dust collection unit is attached later. Note that the dust collection unit included in the projection display device of the second embodiment is substantially the same in basic structure as the dust collection unit in the first embodiment described above, except that it does not include a cooling fan. Only different configurations will be described. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment for the sake of convenience, and description thereof is omitted.

  Although not shown, the projection display device of the second embodiment is configured by attaching a flat air filter in advance in parallel with the intake surface of the intake louver. Instead of this flat air filter, as shown in FIG. 15, the projection display device 2 of the second embodiment is configured by attaching a dust collection unit 4 later.

  Although not shown, the dust collection unit 4 includes the dust collection box 21, the first and second air filters 26 and 27, and the first and second filter support frames 28 and 29. And in the dust collection unit 4, the cooling fans 31 and 32 previously incorporated in the projection type display apparatus 2 are utilized as a cooling fan.

  Further, in the dust collection unit 4, the dust collection box 21 in the first embodiment described above is covered with a casing 41 as shown in FIG. 15. In the casing 41, the exhaust ports 42 a and 42 b of the dust collection box 21 and the cooling fans 31 and 32 disposed in the housing 6 are communicated with each other through the opening 6 a of the housing 6. The casing 41 is formed in a box shape, and one end is detachably attached to the opening 6 a of the housing 6. The other end of the casing 41 is provided with an intake louver 42 for taking outside air into the first air filter 26 disposed inside. The intake louver 42 is provided with a pair of protrusions, similar to the intake louver 20 shown in FIG.

  Similar to the dust collection unit 3 of the first embodiment, the dust collection unit 4 is configured to be attachable to and detachable from an opening 6 a located on the opposite side surface of the housing 6 where the projection lens 11 is disposed. Has been. With this configuration, when the dust collection unit 3 is retrofitted to the housing 6, the dust collection unit 3 is disposed so as to extend to the opposite side of the projection optical axis of the projection lens 11. For this reason, the dust collecting unit 3 can be mounted without obstructing the projection optical axis without reducing the degree of freedom in adjusting the position of the projection optical axis, and the collecting surfaces 33 and 34 of the air filters 26 and 27 are elongated. A degree of freedom to extend in the direction can be secured.

  And according to the projection type display apparatus of this embodiment, by providing the dust collection unit 4, the time taken until an air filter is clogged can be extended significantly similarly to embodiment mentioned above.

  In the projection display device 2 of the present embodiment, the direction in which the dust collection unit 4 is used to increase the area of the collection surfaces 33 and 34 of the air filters 26 and 27 sufficiently to ensure a square cylindrical air This is the longitudinal direction (center axis direction) of the filters 26 and 27. For this reason, in this embodiment, the area of the collection surfaces 33 and 34 of the air filters 26 and 27 can be easily increased by removing the intake louver from the housing 6 and adding the dust collection unit 4 as a retrofit. It is.

  In general projection display devices, the configuration of the air filter is restricted by the internal structure of the projection display device. For this reason, in order to attach the dust collection unit to the casing by retrofitting, it is necessary to replace the casing with a shape corresponding to the dust collection unit. However, according to the present embodiment, it is possible to easily attach the dust collection unit 4 to the housing 6 by removing the intake louver and the air filter provided in advance. Moreover, by attaching the dust collection unit 4 in this way, the collection surface of the air filter can be extended in a direction perpendicular to the intake surface of the intake louver. For this reason, even if it is an existing projection display device, it is not necessary to replace the housing with a new shape. It becomes possible to extend the time.

1 Projection Display 3 Dust Collection Unit (Dust Collector)
21 Dust collection box (structure)
23 Inlet 24a First Exhaust 24b Second Exhaust 26 First Air Filter 27 Second Air Filter 28 First Support Frame (Support)
29 Second support frame (support)
31 1st cooling fan 32 2nd cooling fan 33,34 Collection surface

Claims (4)

A structure having an air inlet and an air outlet; and
And airflow direction are arranged along the first and second air filters capable of cylindrical shape formed elastic deformation having a collection surface that dust is deposited between the intake port and the exhaust port,
A first and a second support for supporting respectively said first and second air filter,
A cooling fan that sends air that has passed through the first and second air filters to a heating element, and
When the first and second air filters are elastically deformed, the size of the eyes of the collection surface changes ,
The first air filter is disposed on an inner periphery of the second air filter,
The first support is detachably supported by the second support,
The said 2nd support body is a dust collector supported by the said structure so that attachment or detachment is possible . The dust collector according to claim 1 ,
Before Symbol first and second air filter and said first and second supports are arranged in the interior of said structure,
The exhaust port is a dust collector provided on a surface of the structure that faces the collection surface. The dust collector according to claim 2, wherein
The exhaust port is a dust collector that has an opening area smaller than the collection surface and is provided at a position of the structure facing a central portion of the collection surface.   The air passed through an elastically deformable air filter having a collecting surface on which dust is accumulated is sent to a heating element, and the air filter is elastically deformed to change the size of the eyes of the collecting surface, A dust collection method in which part of dust accumulated on the collection surface passes through the air filter.

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