CN110673426A

CN110673426A - Cooling device for lamp and reflector in projector

Info

Publication number: CN110673426A
Application number: CN201910968805.8A
Authority: CN
Inventors: 饶钦和; 李衡; 岳德举; 白金刚
Original assignee: Guangdong Union University Optoelectronics Co Ltd
Current assignee: Guangdong Union University Optoelectronics Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-01-10

Abstract

The invention discloses a cooling device for a lamp and a reflector in a projector, which comprises a connecting ring, wherein the connecting ring is arranged between an ellipsoidal reflector and a spherical reflector, the connecting ring is provided with a vent hole, an air guide part comprises a guide cover part and a straight cylinder part, the straight cylinder part is communicated with the guide cover part, the guide cover part is arranged on the ellipsoidal reflector and is connected with the connecting ring, the guide cover part and the ellipsoidal reflector are separated to form an air flow channel, the air flow channel is communicated with the vent hole, and an air outlet of a fan is communicated with the straight cylinder part through a connecting bent pipe. The air-out of fan passes through connecting return bend and straight section of thick bamboo portion in proper order, and most air current enters into airflow channel, and airflow channel guides the air to the top and the outside of ellipsoid reflector, then through the air vent, reaches inside ellipsoid reflector and the spheroid reflector, realizes the high-efficient cooling to two reflectors, and another part air current reaches inside back of spheroid reflector and converges together with the air current that reaches inside the spheroid reflector through the air vent to the other end high-efficient cooling of lamp.

Description

Cooling device for lamp and reflector in projector

Technical Field

The invention relates to the technical field of projectors, in particular to a cooling device for a lamp and a reflector in a projector.

Background

High-end projectors capable of 8000 lumens or more typically employ Xe bulb lamps coupled to an ellipsoidal reflector in which a secondary spherical reflector is also included, in either case necessitating efficient cooling of the reflector and lamp for proper operation. To this end, air is typically directed onto the reflector surface, either directly or through the use of ducting, to keep the reflector temperature and temperature gradient below a predetermined threshold, with the most direct approach being to employ a fan to push the air axially onto the reflector. However, due to space size limitations of the projector, in most cases air is forced to the sides of the reflector and the ducts are used to redistribute the air, which can result in regions of the reflector having high temperature gradients, resulting in local distortions and reduced coupling efficiency. In addition, in order to cool the lamp end, air must be forced through the rear opening of the reflector, over the first end of the bulb, over the center of the bulb, and finally over the other end of the lamp, which however results in an air flow over the other end of the lamp that is too low to be effectively cooled. Therefore, additional fans and/or complex additional ducting from the main fan is often required to provide cooling to the other lamp end. It follows that the prior art has certain drawbacks.

Disclosure of Invention

In view of the above, in order to solve the problems in the prior art, the present invention provides a cooling device for a lamp and a reflector in a projector, so as to achieve efficient cooling of the reflector and the lamp end.

The invention solves the problems through the following technical means:

a cooling apparatus for a lamp and a reflector in a projector, comprising:

the connecting ring is arranged between the ellipsoidal reflector and the spherical reflector, the rear end of the connecting ring is connected with the ellipsoidal reflector, the front end of the connecting ring is connected with the spherical reflector, and a plurality of vent holes are further formed in the section of the connecting ring between the ellipsoidal reflector and the spherical reflector;

the air guide piece comprises a guide cover part and a straight cylinder part, the straight cylinder part is communicated with the guide cover part, the guide cover part is arranged on the elliptical reflector and connected with the connecting ring, the guide cover part and the elliptical reflector are separated into an air flow channel, and the air flow channel is communicated with the vent hole;

and the air outlet of the fan is communicated with the straight barrel part through a connecting bent pipe.

Furthermore, a vortex generating assembly is arranged in the straight cylinder part and comprises a central column, a cylinder and four spiral blades, the cylinder is connected with the inner wall of the straight cylinder part, one end of each of the four spiral blades is uniformly distributed on the periphery of the central column in the same rotating direction, the other end of each of the four spiral blades is arranged on the inner wall of the cylinder, and the spiral blades and the central column form an angle of 45 degrees in the axial direction.

Furthermore, the rear end of the ellipsoid reflector is also provided with a drainage plate, and the drainage plate is used for guiding the airflow reaching the straight cylinder part to the airflow channel.

Furthermore, a plurality of spiral flow deflectors are arranged on the inner wall of the connecting elbow along the axial direction of the connecting elbow.

Further, the vent hole is a tapered hole, and the large end of the tapered hole faces the airflow channel.

Furthermore, the ellipsoid reflector and the sphere reflector are made of glass.

Furthermore, the ellipsoid reflector and the sphere reflector are made of metal materials.

Further, the light reflecting surfaces of the ellipsoidal and spherical reflectors are coated with an IR absorbing coating.

Further, the outer surfaces of the ellipsoidal reflector and the spherical reflector are polished.

Further, the fan is a centrifugal blower.

Compared with the prior art, the invention has the following beneficial effects:

the air-out of fan is through connecting return bend and straight section of thick bamboo portion in proper order, under the water conservancy diversion of connecting return bend and straight section of thick bamboo portion, most air current enters into the air current passageway, and inside another part air current enters into the ellipsoid reflector along the opening of ellipsoid reflector tail end, the air current passageway guides the top and the outside of ellipsoid reflector with the air, then through the air vent, reach inside ellipsoid reflector and the spheroid reflector, the realization is to ellipsoid reflector and spheroid reflector high-efficient cooling, another part air current gathers together with the air current that reaches inside the spheroid reflector through the air vent after reaching inside the spheroid reflector, the other end high-efficient cooling to the lamp.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a partial enlarged view A of FIG. 1;

FIG. 3 is a top view of the present invention;

FIG. 4 is a flow diagram of the gas flow in the present invention;

FIG. 5 is a schematic view of the vortex generating assembly of the present invention;

fig. 6 is a sectional view B-B of fig. 5.

Description of reference numerals:

1. a connecting ring; 2. an ellipsoidal reflector; 3. a spherical reflector; 4. a vent hole; 5. a flow guide cover part; 6. a straight tube portion; 7. an air flow channel; 8. a fan; 9. connecting a bent pipe; 10. a central column; 11. a cylinder; 12. a helical blade; 13. an opening; 14. a spiral flow deflector; 15. and a lamp.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

It is to be understood that the terms "top," "bottom," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplifying the description, and are not intended to indicate or imply that the referenced devices or elements must have the specified orientations, be constructed and operated in the specified orientations, and are not to be construed as limiting the present invention.

The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, a "set" means two or more unless otherwise specified.

Examples

As shown in fig. 1, 2 and 3, the present invention discloses a cooling device for a lamp and a reflector in a projector, which specifically comprises: the connecting ring 1 is arranged between the ellipsoidal reflector 2 and the spherical reflector 3, the rear end of the connecting ring 1 is connected with the ellipsoidal reflector 2, the front end of the connecting ring 1 is connected with the spherical reflector 3, and a plurality of vent holes 4 are further formed in the connecting ring 1 in a section between the ellipsoidal reflector 2 and the spherical reflector 3;

the air guide piece comprises a guide cover part 5 and a straight cylinder part 6, the straight cylinder part 6 is communicated with the guide cover part 5, the guide cover part 5 is covered on the elliptical reflector 2 and is connected with the connecting ring 1, the guide cover part 5 and the elliptical reflector 2 are separated into an air flow channel 7, and the air flow channel 7 is communicated with the vent hole 4;

the fan 8, in this embodiment, the fan 8 is preferably a centrifugal blower 8, and the air outlet of the fan 8 is communicated with the straight cylinder 6 through a connecting bent pipe 9.

As shown in fig. 3 and 4, the outlet air of the fan 8 sequentially passes through the connecting bent pipe 9 and the straight cylinder 6, and under the guiding of the connecting bent pipe 9 and the straight cylinder 6, most of the air flow enters the air flow channel 7, and the other part of the air flow enters the ellipsoidal reflector 2 along the opening 13 at the tail end of the ellipsoidal reflector 2, the air flow channel 7 guides the air to the upper part and the outer part of the ellipsoidal reflector 2, and then passes through the vent hole 4 to reach the inside of the ellipsoidal reflector 2 and the spherical reflector 3, so that the ellipsoidal reflector 2 and the spherical reflector 3 are efficiently cooled, and the other part of the air flow reaches the inside of the spherical reflector 3 and then converges with the air flow reaching the inside of the spherical reflector 3 through the vent hole 4, finally leaves through the front end of the spherical reflector 3, and efficiently cools the other end of the lamp. Wherein the deflector cap 5 and the ventilation holes 4 create a venturi effect at the central portion of the ellipsoidal reflector 2, this vacuum draws air through the openings 13 at the rear of the ellipsoidal reflector 2, thereby efficiently cooling the lamp 15, after which this air flow merges into the air flowing out through the front end of the spherical reflector 3.

As shown in fig. 5 and 6, a vortex generating assembly is arranged in the straight cylinder part 6, the vortex generating assembly comprises a central column 10, a cylinder 11 and four spiral blades 12, the cylinder 11 is connected with the inner wall of the straight cylinder part 6, one end of each of the four spiral blades 12 is uniformly distributed around the central column 10 in the same rotation direction, the other end of each of the four spiral blades 12 is arranged on the inner wall of the cylinder 11, and the spiral blades 12 form an angle of 45 degrees with the axial direction of the central column 10. After the air outlet of the fan 8 reaches the straight cylinder part 6, the vortex generation assembly forces the air to generate vortex in the straight cylinder part 6, so when the air flow reaches the rear end of the ellipsoidal reflector 2, the air flow uniformly circulates around the rear end of the ellipsoidal reflector 2, and finally the air flow is forced to flow out through the vent holes 4 at the connecting ring 1, so that the cooling effect of the air flow on the ellipsoidal reflector 2 and the spherical reflector 3 is improved.

As a further preferable scheme, the rear end of the ellipsoid reflector 2 is further provided with a flow guiding plate, and the flow guiding plate is used for guiding the airflow reaching the straight cylinder part 6 into the airflow channel 7. It is ensured that when the air flow reaches the rear end of the ellipsoidal reflector 2, most of the air flow enters the air flow channel 7 mainly along the flow guide plate, rather than entering the inside of the ellipsoidal reflector 2 through the opening 13 at the rear end of the ellipsoidal reflector 2, and the venturi effect is improved.

As shown in fig. 3, in the present embodiment, a plurality of spiral deflectors 14 are arranged on the inner wall of the connecting elbow 9 in the axial direction thereof. When the air outlet of the fan 8 passes through the connecting bent pipe 9, the spiral guide vanes 14 force the air to rotate, and a primary vortex is generated in the connecting bent pipe 9.

As shown in fig. 2, in the present embodiment, the ventilation hole 4 is a tapered hole, and the large end of the tapered hole faces into the airflow passage 7. The vent holes 4 are tapered holes, which help to promote the venturi effect.

In a further preferred embodiment, in the present embodiment, the ellipsoidal reflector 2 and the spherical reflector 3 are made of glass. In other embodiments, the ellipsoidal reflector 2 and the spherical reflector 3 may be made of metal, preferably, the light-reflecting surfaces of the ellipsoidal reflector 2 and the spherical reflector 3 are coated with an IR-absorbing coating that absorbs infrared light generated by the lamp 15 to help reduce the amount of heat in the projector, and the external surfaces of the ellipsoidal reflector 2 and the spherical reflector 3 are polished to reduce the amount of IR light scattering, which can increase the IR transmittance by up to 20%, which can result in less heating of the reflectors and lower cooling requirements of the reflectors.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A cooling apparatus for a lamp and a reflector in a projector, comprising:

2. The cooling device according to claim 1, wherein the straight cylinder portion is provided with a vortex generating assembly, the vortex generating assembly comprises a central column, a cylinder and four spiral blades, the cylinder is connected with the inner wall of the straight cylinder portion, one end of each of the four spiral blades is uniformly distributed around the central column in the same rotation direction, the other end of each of the four spiral blades is arranged on the inner wall of the cylinder, and the spiral blades and the axial direction of the central column form an angle of 45 degrees.

3. The cooling device as claimed in claim 1, wherein the rear end of the ellipsoid reflector is further provided with a flow guide plate for guiding the air flow arriving in the straight cylinder portion to the air flow passage.

4. A cooling device according to claim 1, characterized in that a plurality of helical flow deflectors are arranged on the inner wall of the connecting bend in the axial direction thereof.

5. The cooling device as claimed in claim 1, wherein the vent hole is a tapered hole, and a large end of the tapered hole faces into the airflow passage.

6. The cooling device of claim 1, wherein the ellipsoidal reflector and the spherical reflector are glass.

7. The cooling device as claimed in claim 1, wherein the ellipsoidal reflector and the spherical reflector are made of metal.

8. The cooling device of claim 7, wherein the light reflecting surfaces of the ellipsoidal and spherical reflectors are coated with an IR absorbing coating.

9. The cooling apparatus of claim 1, wherein the outer surfaces of the ellipsoidal reflector and the spherical reflector are polished.

10. The cooling device of claim 1, wherein the fan is a centrifugal blower.