JP5380035B2 - Electronics - Google Patents

Description

  The present invention relates to cooling of an electronic device, and more particularly to a projector device that prevents entry of dust and dust from the outside in a device that supplies and cools outside air.

  2. Description of the Related Art In recent years, projector devices have been widely used as large-screen display devices corresponding to information presentation needs and video appreciation as image quality is improved.

  This projector device generally uses a high-pressure mercury lamp as a light source, projects light from the light source onto a display panel, forms information, and displays the enlarged image using a projection optical system. In response to demands for higher brightness and higher definition of information, the amount of heat generated by light sources and information processing circuits has increased. In addition, it has components such as a liquid crystal display panel that are not strong in heat resistance. For these reasons, projector devices generally cool by taking in external air using a fan.

  Furthermore, due to the expansion of the use of projector equipment, it is used not only in indoor environments such as offices, but also in environments where relatively large amounts of dust and dust are scattered. Is in a situation where an air filter is installed.

  However, dust prevention with an air filter changes the dust filter's dust collection capacity over time. For example, fine particles gradually pass, and conversely, the filter reduces cooling efficiency due to clogging.

  Patent Document 1 and Patent Document 2 are disclosed as techniques for dealing with these problems and for preventing dust.

JP 2001-343707 A JP-A-2005-121250

  However, the above-described conventional technology has a problem to be solved.

  The dustproof device described in Patent Document 1 is a storage box provided with a clean air supply hole on one side and a warm air exhaust port used for cooling on the other side, and an optical electronic device is disposed in the storage box. Is used as the light outlet of the optical device. However, the technique described in Patent Document 1 has a structure in which air flows out from a plurality of small holes, but dust does not flow in by sufficiently increasing the pressure in the box, so that it is necessary to increase the inflow amount of air. There is. That is, the increase in the amount of inflow of air may cause problems such as an increase in the size of the apparatus due to a large fan and an increase in noise due to high-speed rotation of the fan, but no consideration is given.

  The rear projector described in Patent Document 2 houses an object to be cooled and a blower in a sealed space, arranges a low-temperature portion of a thermoelectric conversion element facing the blower, and is cooled by the low-temperature portion of the thermoelectric conversion element. A cooling device that blows air to the body to be cooled is mounted. However, in the technique described in Patent Document 2, there is a concern that cost increases due to the need for a heat transfer conversion element, a temperature sensor for controlling the temperature, a control circuit, and the like.

  In order to solve the above-described problems, an electronic device according to the present invention is an electronic device that cools a heat-generating portion by heat conversion using inhaled outside air, and includes an electronic device, a main body housing on which the electronic device is mounted, and an electronic device And a cooling unit housing for mounting the cooling device.

  The cooling unit casing is provided with an inlet for sucking outside air and an outlet for discharging the sucked outside air, and the main body casing forms a sealed space.

  The cooling device has a heat exchanger provided with fins, and a duct that is arranged to face the ventilation path of the heat exchanger and forms a ventilation channel, and the duct constitutes two different ventilation channels, One of the ventilation channels is connected to the suction port and the exhaust port of the cooling unit housing to form a cooling wind channel, and the other ventilation channel is connected to the main unit housing so as to form a sealed space. An air circulation channel in the electronic device is configured.

  According to the projector device having the above-described configuration of the present invention, the life of the liquid crystal panel can be extended by suppressing heat generated by the electronic device without sucking dust or dust from the outside into the projector device. It is possible to provide an electronic device that can improve the projected image quality.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a conceptual diagram of a configuration of an electronic device according to an embodiment of the present invention. In FIG. 1, the plan view shows the inside of the main unit housing of the electronic device, and the front view conceptually shows the inside of the cooling unit housing on which the cooling device is mounted.

  As shown in FIG. 1, an electronic apparatus (projector apparatus) 1 according to an embodiment of the present invention has a main body casing 2 and a cooling section casing 3 which are adjacently stacked.

  The main body housing 2 has a structure that constitutes a sealed space, and the light source 11, the optical module 12 such as a display panel, the projection optical system 13 such as a lens, and the power source 14 as components constituting the projector device 1 in the sealed space. And so on. These components are in a state of generating heat, and a plurality of fans 4 are mounted inside the main body housing 2 in order to cool the components.

  The fan 4 blows the air in the main body housing 2 to the components that generate heat as indicated by arrows. The heat generated by the components is exchanged with air blown by the fan. That is, the components are cooled, and the air in the main body housing 2 becomes high temperature.

  On the other hand, the main body housing 2 is configured as a sealed space as described above in order to block the entry of dust and the like from the outside. For this reason, in order to continue cooling the heat-generating component, it is necessary to convert the air in the main body housing 2 to be blown to the heat-generating component into a low temperature state.

  Here, a description will be given of the cooling device 5 for converting the air that has been heat-transferred by the heat-generating components in the main body housing 2 to a low temperature state.

  The cooling device 5 is placed on the cooling unit casing 3 that is installed adjacent to the lower part of the main body casing 2 in the stacking direction. The cooling device shown in FIG. 1 is described with two ventilation channels conceptually for ease of explanation. However, the ventilation channel is not limited to the illustrated shape.

  Further, the main body housing 2 is formed with vent holes 6 (6a, 6b) connected to the cooling device 5 in the cooling housing 3 as the only opening of the sealed space. However, the ventilation openings 6 (6a, 6b) of the main body housing 2 are joined to each of the passage openings forming one ventilation passage of the cooling device 5 (details will be described later). That is, a sealed space including one ventilation channel 5a of the cooling device 5 is formed, and the air in the main body housing 2 is transferred to one of the cooling devices 5 as indicated by an arrow in the front view of FIG. It is circulated in the ventilation channel 5a.

  On the other hand, the cooling unit housing 3 on which the cooling device 5 is mounted is provided with an intake port 31 and an exhaust port 32 for outside air. The cooling air of the outside air sucked from the air inlet 31 of the cooling unit casing 3 is ventilated through the other ventilation channels 5b provided in the cooling device 5 as indicated by white arrows, and the cooling unit casing 3 It is discharged from the exhaust port 32 to the outside.

  Therefore, one cooling device 5 has a structure that blocks the inside of the main body housing 2 from the outside by forming two ventilation channels 5a and 5b.

  Here, the structure and embodiment of the cooling device 5 will be described.

  FIG. 2 is an exploded perspective view showing an outline of the cooling device in the embodiment of the present invention. As shown in FIG. 2, the cooling device 5 includes a heat exchanger 51 and ducts 52 and 53 that form ventilation passages to the heat exchanger 51. In the heat exchanger 51, the frame body 511 is partitioned by a plurality of shelf plates 512, and corrugated fins (hereinafter referred to as fins) 513 are attached between all the shelf plates 512. A space between the shelf plates 512 provided with the fins 513 is formed as ventilation channels 51 a and 51 b of the heat exchanger 51.

  The fins 513 have a function of increasing the contact area with the air that is ventilated through the heat exchanger 51 and improving the performance of heat exchange with the air.

  Further, in order to form a ventilation path as indicated by an arrow in the heat exchanger 51, ducts 52 and 53 are arranged densely facing the fins 513 in the ventilation upstream portion and the downstream portion of the heat exchanger 51. Yes.

  Here, the ducts 52 and 53 pass through the ventilation passages 5a (52a and 52b) and 5b (53a and 53b) which are partitioned at the same interval d so as to face the shelf plate 512 (the interval d) of the heat exchanger 51. Forming.

The air passages 5a (52a → 51a → 53a) and 5b (52b → 51b → 53b) are formed by assembling the ducts 52 and 53 together from both planes of the heat exchanger 51. The ventilation channels 5a and 5b form different ventilation channels for the heat exchanger 51. In the different ventilation channels 5a and 5b, for example, from the ventilation channel 52a side in the duct 52, the electronic device 1 When air heated to high temperature by heat transfer from the heating element is vented from the main body housing 2, the air is passed between the fins 513 through the ventilation channel 51 a of the heat exchanger 51, and the ventilation channel 53 a of the duct 53 is The air is ventilated and circulated in the main body housing 2 of the electronic device 1. On the other hand, from the side of the ventilation channel 52 b in the duct 52, low-temperature air from the outside air is sucked and ventilated, and is blown between the fins 513 through the ventilation channel 51 b of the heat exchanger 51, and is passed to the ventilation channel 53 b of the duct 53. Ventilated and exhausted outside the housing.

  That is, the high-temperature air in the electronic device 1 and the low-temperature air of the outside air are ventilated by different ventilation paths 5a and 5b. The fins 513 of the ventilation channel 51a in the heat exchanger 51 are in a high temperature state due to heat transfer by the high temperature air, and the fins 513 in the adjacent ventilation channels 52a are in a low temperature state due to heat transfer by the low temperature air. Since the temperature state transferred to each fin 513 shares the shelf 512 that forms the ventilation channels 5 a and 5 b of the heat exchanger 51, the shelf 512 receives the heat from each fin 513. The heat conversion is performed by transmission. Therefore, each air thermally converted by the shelf board 512 is blown from the ventilation channels 53 a and 53 b of the duct 53. That is, the air returning to the electronic device 1 is cooled.

  Therefore, the ventilation channels 5 a and 5 b are preferably arranged alternately in the stacking direction of the shelf plates 512 of the heat exchanger 51. In addition, the fins 513 and the shelf boards 512 are preferably formed of a metal material such as an aluminum material having good thermal conductivity.

  In the embodiment shown in FIG. 2, although the ventilation paths for collecting and collecting the intake air to the alternately arranged ventilation paths 52 a and 52 b and the exhaust from the 53 a and 53 b are not shown, these collective ventilation paths are not illustrated. Depending on the structure of the electronic device 1 and the degree of temperature rise of the electronic device 1, the intake side and the exhaust side of the ventilation passage of the high-temperature air and the low-temperature air are provided in different ducts 52 and 53, The structure which cross | intersects a ventilation direction may be sufficient.

  FIG. 3 is a block diagram showing another embodiment of the cooling device according to the present invention.

  3 (1) and 3 (2) are intended to increase the length of the hot air flow path. FIG. 3A is a top view, and after the high-temperature air in the electronic device 1 sucked from the duct 52 is passed through the heat exchanger 51 through the ventilation passage 5a, the exhaust portion of the duct 53 is shielded and the ventilation path. Is configured so that the heat exchanger 51 is ventilated again and exhausted from the other opening of the duct 52. At this time, the reason why the low-temperature wind of the outside air is sucked from the direction opposite to the direction of sucking the high-temperature air through the ventilation passage 5b is that the high-temperature wind is averagely converted into heat. The direction may be the same as the direction. However, in the stacking direction, as shown in FIG. 3B, it is preferable that the ventilation channels 5a and the ventilation channels 5b are alternately arranged.

  Further, FIG. 3 (3) shows a case where the heat converter 51 is divided and the thermal connection of each heat exchanger is separated corresponding to the high-temperature air intake ventilation passage 52 a. The purpose of this is to avoid heat conduction to the other part of the heat exchanger 51 in the high-temperature state immediately before inhalation of high-temperature air, and to fully draw out the performance of each heat exchanger 51.

  The selection of the relationship between the flow direction of the high temperature air and the low temperature air, the number of turns of the high temperature air and the low temperature air, the number of divisions of the heat exchanger, etc. is not limited to the above description, and various selections may be made depending on the heat generation amount. It can be set as the following.

  As described above, one ventilation channel 5a and the other ventilation channel 5b of the cooling device 5 are formed adjacent to each other by the shelf board 512 made of metal aluminum material having good thermal conductivity. The high-temperature air that is ventilated through one of the ventilation channels 5a is heat-exchanged by the low-temperature outside air that is ventilated through the other adjacent ventilation channel 5b, so that the air in the main body housing 2 is cooled. . Here, since the air in one ventilation channel 5a and the other ventilation channel 5b of the cooling device 5 is not mixed, dust or the like is mixed in the outside air ventilated through the ventilation channel 5b. However, it is not carried into the main body housing 2 of the electronic device 1.

  The cooling device according to the present invention is a method of disposing an electronic device in a hermetically sealed casing to protect the dust of the electronic device and cooling the air inside the electronic device. It is also effective in equipment.

It is a composition conceptual diagram of the electronic equipment in the example of the present invention. It is a disassembled perspective view which shows the outline | summary of the cooling device in the Example of this invention. It is a block diagram which shows the other Example of the cooling device in this invention.

Explanation of symbols

  1: electronic equipment, 2: main body housing, 3: cooling housing, 4: fan, 5: cooling device, 5a: ventilation channel, 5b: ventilation channel, 51: heat exchanger, 52: duct, 53: Duct, 513: Fin, 512: Shelf.

Claims (5)

In electronic equipment that cools the heat generating part by heat conversion in the outside air to be inhaled,
The electronic device, a main body housing for mounting the electronic device, a cooling device for cooling the electronic device, and a cooling unit housing for mounting the cooling device,
The cooling unit housing is provided with a suction port for sucking outside air and a discharge port for discharging sucked outside air, and the first cooling air flows from the suction port to the discharge port,
The main body housing has a structure that forms a sealed space through which the second cooling air circulates,
The cooling device includes a heat exchanger provided with fins through which the first cooling air and the second cooling air pass, and a duct that is disposed to face a ventilation path of the heat exchanger and forms a ventilation channel. And
The duct includes a plurality of first ventilation passages through which the first cooling air flows and a plurality of second ventilation passages through which the second cooling air flows. The air flow path communicates the suction port and the discharge port of the cooling unit housing to form a cooling air flow channel, and the second ventilation flow channel forms a sealed space with the main body housing. Configure the air circulation flow path in the connected electronic equipment,
The first ventilation channel and the second ventilation channel of the duct are alternately arranged in a direction perpendicular to the ventilation direction, and the first cooling air and the second cooling air are supplied from the heat exchanger. An electronic device characterized by alternately ventilating in a direction perpendicular to the ventilation direction. The electronic device according to claim 1,
2. The electronic apparatus according to claim 1, wherein the second ventilation channel of the duct is configured by folding once or a plurality of times on a plane. The electronic device according to claim 2,
The electronic apparatus according to claim 1, wherein the heat exchanger is divided and separated from the ventilation passage of the duct. The electronic device according to claim 1,
The heat exchanger has an air flow path formed by corrugated fins. The electronic device according to claim 1,
The electronic device is a projector device.

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