JP2001132694A - Air blowing device and liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blowing device capable of reducing a pressure loss and capable of effectively blowing air without lengthening an air duct when blowing cooling air from the air blowing device by squeezing the air in the air duct having a small opening. SOLUTION: An air blower has a sirocco fan and a cylindrical casing for surrounding this sirocco fan to blow off cooling air from an air blowing port formed in the casing by rotation of the sirocco fan. An air shielding member is installed so as to block up a part of the air blowing port. An end surface of the air shielding member forms a circular arc surface curving in the almost same curvature as an inner wall of the casing to smooth a flow of wind in the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sirocco fan-type blower suitable for cooling various electronic devices, and to a liquid crystal projector using the blower.

[0002]

2. Description of the Related Art Conventionally, since various electronic devices have a heat source, a cooling air blowing device is provided, and cooling air from the air blowing device is applied to the heat source portion to cool the electronic device. In particular, liquid crystal projectors irradiate the light from the light source to the liquid crystal panel and project the light transmitted through the liquid crystal panel onto the screen.Therefore, it is necessary to brighten the light source. Is used.

For this reason, the temperature inside the projector rises due to the heat generated by the light source, and the liquid crystal panel is heated and the temperature rises. When used for a long time, the liquid crystal material is adversely affected. In order to improve this, conventionally, a blower is provided in the projector, and the liquid crystal panel is cooled by cooling air from the blower.

Hereinafter, a conventional liquid crystal projector and a blower will be described with reference to FIGS. FIG. 5 shows a schematic configuration of a liquid crystal projector.
Indicates an example of a blower.

In FIG. 5, a liquid crystal projector 1 has
Light source 2, dichroic mirrors 3, 4, reflection mirror 5,
6, 7 and liquid crystal panels 8R, 8G, 8B, a cross prism 9, a projection lens 10, and the like.

The white light from the light source 2 is applied to dichroic mirrors 3 and 4, and the dichroic mirror 3 reflects R light (red light), transmits G light (green light) and B light (blue light), The dichroic mirror 4 reflects the G light and transmits the B light. The R light reflected by the dichroic mirror 3 is reflected by the reflection mirror 5 to form a liquid crystal panel 8R.
G light reflected by the dichroic mirror 4 directly enters the liquid crystal panel 8G, and B light transmitted through the dichroic mirror 4 is reflected by the reflection mirrors 6 and 7, respectively, and enters the liquid crystal panel 8B.

Each of the liquid crystal panels 8R, 8G, 8B has red, green,
This is a transmission type light valve that forms an image corresponding to blue. Image light transmitted through each of the liquid crystal panels 8R, 8G, and 8B is combined by a cross prism 9 and projected on a screen (not shown) via a projection lens 10. It is supposed to be. Note that the cross prism 9 is connected to the liquid crystal panel 8R,
It has a characteristic that the image light incident from the liquid crystal panel 8G is reflected toward the projection lens 10 and the image light incident from the liquid crystal panel 8G is transmitted to the projection lens 10 side.

FIG. 6 shows a conventional blower, and shows a sirocco fan type blower 11 in a sectional view.
In FIG. 6, reference numeral 12 denotes a sirocco fan, and a casing 13 is provided so as to surround the sirocco fan 12. The sirocco fan 12 is driven to rotate by a motor, and causes air from a suction port (not shown) formed on a side surface of the blower 11 to flow out to the blow port 15 by centrifugal force generated by rotation of the fan 12. In the drawing, the detailed structure of the motor is omitted, and only the drive shaft 14 is shown.

When such a blower 11 is used for cooling the liquid crystal panel or the like, the cooling air from the blower port 15 is supplied to the air passage 1 having an opening smaller than the blower port.
In many cases, the air is sent to a cooled object (a liquid crystal panel or the like) through the air inlet 6. In such a case, for example, a wind shield plate 17 is attached so as to close a part of the air outlet 15, and the air outlet 15 is narrowed. I have.

However, when such a wind shield plate 17 is provided, the wind from the sirocco fan 12 and the vortex wind generated by the wind shield plate 16 intersect with each other, causing a pressure loss and reducing the blowing efficiency. There is a disadvantage that a wind noise is generated and noise is generated.

That is, the air from the sirocco fan 12 is divided into a wind a effective for cooling, a wind b trying to return along the inner wall of the casing 13, and a wind c returning to hit the wind shield plate 17. Is lost due to the influence of the wind b and swirls, resulting in pressure loss.

As shown in FIG. 7, there is an example in which a tapered pipe 18 for blowing air while gradually reducing the cooling air from the air outlet 15 is attached to the front surface of the air outlet 15 as shown in FIG. In this case, as the inclination of the pipe 18 becomes gentler and longer, the above-mentioned swirl is reduced, but there is a disadvantage that the air path becomes longer and the structure becomes larger.

[0013]

SUMMARY OF THE INVENTION In a conventional blower,
When the wind shield plate 17 is provided to reduce the wind, the wind from the sirocco fan 12 and the vortex wind generated by the wind shield plate 17 intersect with each other, causing a pressure loss and reducing the blowing efficiency, and There was a problem that noise was generated due to noise. When the tapered pipe 18 is attached to the front surface of the air outlet 15, the above-mentioned swirling is reduced as the inclination of the pipe 18 is made gentler and longer, but the air path becomes longer by that amount, and the structure is structurally reduced. There was an inconvenience of increasing the size.

In view of the above, the present invention reduces the pressure loss and effectively cools the cooling air from the air outlet without blowing the air passage when the air is blown into the air passage having an opening smaller than the air outlet. It is an object of the present invention to provide a blower that can blow air.

[0015]

According to the first aspect of the present invention,
A sirocco fan, and a blower having a cylindrical casing provided to surround the sirocco fan, and configured to blow cooling air generated by rotation of the sirocco fan from an air outlet formed in the casing,
A windshield member that is inserted and attached to the air outlet so as to close a part of the air outlet, and the inserted end surface forms an arc surface curved with substantially the same curvature as the inner wall of the casing; A blower characterized in that cooling air blown out from a blower port is throttled to enable blown air.

According to a third aspect of the present invention, there is provided an inflow port through which the cooling air throttled by the blower is introduced, and a shunt for shunting the cooling air flowing into the inflow port into a plurality. Means, a plurality of air outlets for blowing cooling air passing through the shunt means, and the air passage so as to be cooled by cooling air blown out from the plurality of air outlets. A plurality of liquid crystal panels attached to the device,
A liquid crystal projector, comprising: optical means for respectively entering different primary color lights into the plurality of liquid crystal panels, and combining and projecting image light emitted from the plurality of liquid crystal panels.

According to the blower of the first aspect, the blower can be blown by narrowing the blower of the blower in accordance with the object to be cooled.
In addition, since the wind generated by the sirocco fan flows along the inner wall of the casing and the arc surface of the wind shielding member, a spiral wind is not generated, and pressure loss and wind noise can be reduced.

According to the liquid crystal projector of the present invention, the cooling air from the blower can be divided into a plurality of air by the air passage device and used for cooling a plurality of liquid crystal panels. The wind from the blower can be used effectively.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a blower according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an assembled state.

In FIG. 1, reference numeral 21 denotes a blower. The blower 21 has a sirocco fan 22 and a cylindrical casing 23 surrounding the sirocco fan 22. A suction port 24 is provided on one side of the casing, and a motor (not shown) is mounted on the other side, and the sirocco fan 22 is rotated by the rotational force of the motor. In FIG. 2, the drive shaft of the motor is denoted by reference numeral 2.
Indicated at 5.

The casing 23 is provided with an air outlet 26, and when the sirocco fan 22 is driven to rotate,
The air from the suction port 24 formed in the blower 21 is
The air is sent to the air outlet 26 by the centrifugal force generated by the rotation of No. 2 and is blown out to the outside. Further, for example, a mesh filter 27 is attached to the suction port 24 in order to prevent inflow of dust and the like.

Further, a wind shield member 28 can be attached to the air outlet 26 so as to close a part of the opening. The wind shield member 28 has a main body 281 inserted into the upper part of the air outlet 26, and system stop projections 282 and 283 for locking the main body 281 to an edge of the air outlet 26. FIG. 2 shows a state in which the wind shield member 28 is inserted and attached to the air outlet 26.

As can be seen from FIG. 2, the outer wall of the main body 281 of the wind shield member 28 is provided with an arc-shaped surface 284 having the same curvature as the inner wall of the casing 23.
8 is attached to the air outlet 26 such that the inner wall of the casing 23 and the arc-shaped surface 284 are continuous. Accordingly, when a part of the air outlet 26 is closed by the wind shield member 28 and the cooling air is sent to the air passage device 29 having an opening smaller than the air outlet 26, the air outlet can be narrowed.

As is apparent from FIG. 2, the air from the sirocco fan 22 is divided into a wind a effective for cooling and a wind b returning along the inner wall of the casing 13. Since it returns along the arcuate surface 284 of the member 28, there is no spiral wind as in the related art, and no pressure loss occurs. That is, the wind b smoothly flows along the cylindrical wall formed by the inner wall of the casing 13 and the arc-shaped surface 284 of the wind shielding member 28.

Next, an embodiment in which such a blower is applied for cooling a liquid crystal projector will be described with reference to FIGS.

FIG. 3 is a perspective view showing an embodiment in which the air path device 29 in FIG. 2 is configured for a liquid crystal projector. FIG. 4 is a perspective view showing the air path device in FIG.
It is a top view which shows the example which assembled the projection lens.

In FIG. 3, the air duct device 29 has a box-shaped main body 30, and one side of the main body 30 is provided with the blower 21.
An air inlet 31 for receiving the wind a from the air outlet 26 is formed. Air outlets 32, 33, and 34 are formed at three locations on the upper surface of the main body 30, and the wind a that has flowed in through the air inlet 31 is guided to the outlets 32, 33, and 34. In addition, a shunt plate (not shown) is formed in the main body 30 so that air can be sent in three directions indicated by alternate long and short dash lines a1, a2 and a3.

The air outlets 32, 3 of the air passage device 29
The liquid crystal panels 8R, 8G, and 8B are respectively mounted so as to be located between the pairs of outlets. LCD panel 8
As shown in FIG. 4, a cross prism 9 is mounted in a space surrounded by R, 8G, and 8B, and a projection lens 10 is mounted to face the output surface of the cross prism 9. In addition,
In FIG. 4, a dashed line 36 indicates a projector housing. The liquid crystal panels 8R, 8G, 8B, the cross prism 9, and the projection lens 10 constitute a liquid crystal projector similar to that shown in FIG.

According to the configuration of FIGS. 3 and 4, the outside air taken into the blower 21 is blown out from the blower port 26 by centrifugal force due to the rotation of the sirocco fan 22 of the blower 21, and the air inlet 31 of the air path device 29. Cooling air is sent to the This cooling air is supplied to three air passages a1, as shown in FIG.
The light is shunted to a2 and a3 and is blown out from the outlets 32, 33 and 34, and cools the incident surface and the outgoing surface of the liquid crystal panel, respectively. Therefore, the wind from one blower 21 can be used effectively.

By changing the size of the wind shield member 28 shown in FIG. 1, the area for closing the blower opening 26 can be changed. Therefore, several wind shield members 28 having different sizes are prepared. In advance, it is more effective to select the type according to the object to be cooled.

As described above, according to the blower of the present invention, when the cooling air is blown into the wind path device 29 having an opening smaller than the blower opening 26, the blower can be blown by narrowing the blower. In addition, since the air from the sirocco fan 12 does not generate a swirling wind as in the related art, there is no pressure loss or wind noise, and the sirocco fan 1
The wind from 2 can be used effectively for cooling.

When the blower of the present invention is applied to a liquid crystal projector, the cooling air is shunted to three air passages to cool the entrance surface and the exit surface of the liquid crystal panel, respectively. The liquid crystal panel can be effectively cooled by the wind.

[0033]

As described above, according to the blower of the present invention, it is possible to reduce the pressure loss and reduce the wind noise when blowing the air by narrowing the blower opening of the blower. Can be effectively used for cooling. Further, when the blower of the present invention is applied to a liquid crystal projector, there is an effect that a plurality of liquid crystal panels can be effectively cooled by cooling air from one blower.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a blower of the present invention.

FIG. 2 is a sectional view of a state where the blower of FIG. 1 is assembled.

FIG. 3 is a perspective view showing one embodiment of an air path device used in the liquid crystal projector of the present invention.

FIG. 4 is a plan view of a liquid crystal projector using the air path device of FIG.

FIG. 5 is a configuration diagram showing a schematic configuration of a general liquid crystal projector.

FIG. 6 is a sectional view showing an example of a conventional blower.

FIG. 7 is a cross-sectional view showing another example of a conventional blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal projector, 2 ... Light source, 8R, 8G, 8B ... Liquid crystal panel, 9 ... Cross prism, 10 ... Projection lens, 21 ... Blower, 22 ... Sirocco fan, 23 ... Casing, 26 ... Blow port, 28 ... Wind shield Member: 284: arc surface, 29: air path device, 32, 33, 34: outlet.

Claims (4)

[Claims] 1. A sirocco fan and a cylindrical casing provided so as to surround the sirocco fan, and cooling air generated by rotation of the sirocco fan is blown out from an air blowing port formed in the casing. A blower, which is inserted and attached to the blower port so as to close a part of the blower port, and an inserted end face forms an arc surface curved at substantially the same curvature as the inner wall of the casing; and A blower, wherein cooling air blown out from the blower port is throttled so as to be able to blow air. 2. A method according to claim 1, wherein a plurality of air-blocking members having different air-blocking areas are provided, and a throttle amount of cooling air blown out from the air-blowing ports can be adjusted in accordance with a cooled object. The blower according to claim 1, wherein 3. An inflow port through which the cooling air throttled by the blower is introduced, shunt means for shunting the cooling air flowing into the inflow port into a plurality, and the shunt means. An air passage device having a plurality of outlets for blowing out the cooling air passed therethrough; and a plurality of liquid crystals attached to the air passage device so as to be cooled by the cooling air blown out from the plurality of outlets. A liquid crystal projector, comprising: a panel; and an optical unit that causes different primary color lights to be incident on the plurality of liquid crystal panels, and combines and projects video light emitted from the plurality of liquid crystal panels. 4. The plurality of outlets each form a pair,
The liquid crystal panel is disposed between the pair of outlets, and the incident surface and the output surface of each liquid crystal panel are cooled by cooling air blown out from the pair of outlets. 3. The liquid crystal projector according to 3.