CN-117471831-B - Projection ray apparatus and projection equipment

CN117471831BCN 117471831 BCN117471831 BCN 117471831BCN-117471831-B

Abstract

The invention relates to a projection optical machine and projection equipment. The projection optical machine comprises a shell, an optical assembly, a heat exchange device and a fan. The first lens, the second lens and the shell enclose to form a first closed cavity, the first closed cavity comprises an air cooling cavity, a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity and the second heat exchange cavity are respectively located on two sides of the condensing piece, the air cooling cavity is arranged between the first heat exchange cavity and the second heat exchange cavity and is respectively communicated with the first heat exchange cavity and the second heat exchange cavity, and the liquid crystal light valve is arranged in the air cooling cavity. The heat exchange device is arranged on the cavity wall of the first heat exchange cavity and/or the second heat exchange cavity, part of the heat exchange device is positioned in the first heat exchange cavity and/or the second heat exchange cavity, and the fan is arranged in the first heat exchange cavity or the second heat exchange cavity, so that the heat dissipation efficiency can be improved. In addition, the condensing part is arranged in the space surrounded by the first heat exchange chamber, the air cooling chamber and the second heat exchange chamber, so that the space is fully utilized, and the size of the projection optical machine is reduced.

Inventors

WANG YUYAO
SONG LELE
JIANG HAO
TAN DAZHI

Assignees

峰米(重庆)创新科技有限公司

Dates

Publication Date: 20260512
Application Date: 20220720

Claims (13)

1. A projection light engine, comprising: A housing; The optical assembly comprises a light source, a light condensing part, a first lens, a liquid crystal light valve and a second lens, wherein the light condensing part, the first lens, the liquid crystal light valve and the second lens are sequentially arranged along an emergent light propagation path of the light source, a first closed cavity is formed by surrounding the first lens, the second lens and the shell, the first closed cavity comprises an air cooling cavity, a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity and the second heat exchange cavity are respectively positioned on two opposite sides of the light condensing part, the air cooling cavity is arranged between the first heat exchange cavity and the second heat exchange cavity and is respectively communicated with the first heat exchange cavity and the second heat exchange cavity, the liquid crystal light valve is arranged in the air cooling cavity, a first air channel is formed between the first lens and the liquid crystal light valve, a second air channel is formed between the liquid crystal light valve and the second lens, one end of the first air channel is communicated with one end of the second air channel through the first heat exchange cavity and one end of the second air channel, and the other end of the second air channel is communicated with the other end of the first air channel through the second heat exchange cavity and the other end of the first air channel; The heat exchange device is arranged on the cavity wall of the first heat exchange cavity and/or the second heat exchange cavity, and part of the heat exchange device is positioned in the first heat exchange cavity and/or the second heat exchange cavity; The fan is arranged in the first heat exchange cavity or the second heat exchange cavity, the fan is provided with an air inlet and an air outlet, the air outlet is communicated with the first air duct, the air inlet is communicated with the second air duct, and the fan is used for driving heat dissipation airflow in the first heat exchange cavity, the air cooling cavity and the second heat exchange cavity to circularly flow and flow through the liquid crystal light valve and the heat exchange device.
2. The projection light engine of claim 1, wherein the heat exchanging device comprises a first heat exchanger, the first heat exchanger comprises a first heat dissipating part and a first heat exchanging part, the first heat exchanging part is arranged in the first heat exchanging cavity, and the first heat dissipating part is arranged outside the first heat exchanging cavity.
3. The projector light engine of claim 2 further comprising a first separator, one end of the first separator being in sealing engagement with a side of the liquid crystal light valve adjacent to the first heat exchange chamber, the other end of the first separator extending into the first heat exchange chamber and having a first space between a wall of the first heat exchange chamber remote from the liquid crystal light valve to separate the first heat exchange chamber into a third air duct adjacent to the light gathering member and a fourth air duct remote from the light gathering member, one end of the third air duct being in communication with the first air duct through the first space, the other end of the third air duct being in communication with the first air duct, and the other end of the fourth air duct being in communication with the second air duct.
4. The projection light engine of claim 3, wherein the first heat exchange portion is disposed in the fourth air duct, and the first heat exchange portion extends from an end of the fourth air duct near the air cooling chamber to an end of the fourth air duct far from the air cooling chamber.
5. The projection light engine of claim 4, wherein an end of the first heat exchanging portion away from the air cooling chamber passes through the first space and extends into the third air duct, and the height of the first space is less than half of the height of the first heat exchanging chamber.
6. The projector according to claim 1, further comprising a second partition member, wherein one end of the second partition member is in sealing fit with one side of the liquid crystal light valve, which is close to the second heat exchange chamber, the other end of the second partition member extends into the second heat exchange chamber, a second space is formed between a wall of the second heat exchange chamber, which is far away from the liquid crystal light valve, and a chamber wall of the second heat exchange chamber, which is far away from the light gathering member, and a sixth air passage, which is close to the light gathering member, wherein the air outlet is arranged at one end of the fan, which is close to the air cooling chamber, two sides of the fan, which are provided with one end of the air outlet, are respectively in interference fit with the second partition member and the casing, the air outlet is communicated with the first air passage through the sixth air passage, and the air inlet is arranged at one side of the fan, which is far away from and/or faces the light gathering member, and the air inlet is communicated with the second air passage through the second space and the fifth air passage.
7. The projection light engine of claim 6, wherein the heat exchanger further comprises a second heat exchanger, the second heat exchanger comprises a second heat dissipation portion and a second heat exchange portion, the second heat exchange portion is disposed in the second heat exchange chamber, and the second heat dissipation portion is disposed outside the second heat exchange chamber.
8. The projection light engine of claim 7, wherein the second heat exchange portion is disposed in the fifth air duct, and the second heat exchange portion extends from an end of the fifth air duct near the air cooling chamber to an end of the fifth air duct far from the air cooling chamber.
9. The projection light engine of claim 1, wherein the optical assembly further comprises an insulating optical plate disposed within the air-cooled cavity; the heat-insulating optical plate is arranged between the first lens and the liquid crystal light valve, the heat-insulating optical plate is in sealing connection with the first lens, and the first air channel is formed between the heat-insulating optical plate and the liquid crystal light valve, or the heat-insulating optical plate divides the first air channel into a first air-dividing channel and a second air-dividing channel which are parallel, wherein a first air-dividing channel is formed between the first lens and the heat-insulating optical plate, and a second air-dividing channel is formed between the heat-insulating optical plate and the liquid crystal light valve; Or the heat-insulating optical plate is arranged on one side of the first lens far away from the liquid crystal light valve, and the heat-insulating optical plate is in sealing connection with the first lens.
10. The projection light machine of claim 1, wherein the light converging member is a light cone, the light cone is provided with a light incident end and a light emergent end, the sectional area of the light cone gradually increases along the direction from the light incident end to the light emergent end, the light source is arranged at the light incident end, and the first lens is arranged at the light emergent end.
11. The projection light engine of claim 10, further comprising a bracket connected to the housing, the bracket having a receiving cavity adapted to the light cone, the light cone being disposed in the receiving cavity, a side wall of the bracket having a heat dissipation hole in communication with the receiving cavity.
12. The projector of claim 1, wherein the second lens and the housing further enclose a second closed chamber, the second closed chamber is located at a side of the air-cooled chamber away from the light-gathering member, the optical assembly further comprises a projection lens and a reflector, the reflector and at least a portion of the projection lens are disposed in the second closed chamber, and the reflector is configured to reflect light emitted from the second lens to the projection lens.
13. A projection device comprising a projection engine as claimed in any one of claims 1 to 12.

Description

Projection ray apparatus and projection equipment Technical Field The present invention relates to the field of projection technologies, and in particular, to a projection light machine and a projection device. Background The projection light machine consists of a light source, a light gathering piece, a front Fresnel lens, a liquid crystal light valve, a rear Fresnel lens, a projection lens and the like. During projection, the light source emits light, the light irradiates the liquid crystal light valve through the rear Fresnel lens, the emitted light is collected to the projection lens through the front Fresnel lens, and finally the content displayed by the liquid crystal light valve is projected on the screen. Because the transmittance of the liquid crystal light valve is low, most of light is concentrated on the liquid crystal light valve, absorbed by the liquid crystal light valve and reflected in the form of heat, so that the temperature of the liquid crystal light valve is very high. In order to solve the heat dissipation problem, a heat exchange device is configured in the projection optical machine, however, the heat dissipation efficiency of the common projection optical machine is low and the volume is large. Disclosure of Invention Accordingly, it is necessary to provide a projection light machine and a projection apparatus, which can improve heat dissipation efficiency and facilitate reduction in volume. A projection light engine, comprising: A housing; The optical assembly comprises a light source, a light gathering piece, a first lens, a liquid crystal light valve and a second lens, wherein the light gathering piece, the first lens, the liquid crystal light valve and the second lens are sequentially arranged along an emergent light propagation path of the light source, the first lens, the second lens and the shell are surrounded to form a first closed cavity, the first closed cavity comprises an air cooling cavity, a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity and the second heat exchange cavity are respectively positioned on two opposite sides of the light gathering piece, the air cooling cavity is arranged between the first heat exchange cavity and the second heat exchange cavity and is respectively communicated with the first heat exchange cavity and the second heat exchange cavity, and the liquid crystal light valve is arranged in the air cooling cavity; The heat exchange device is arranged on the cavity wall of the first heat exchange cavity and/or the second heat exchange cavity, and part of the heat exchange device is positioned in the first heat exchange cavity and/or the second heat exchange cavity; the fan is arranged in the first heat exchange cavity or the second heat exchange cavity, and is used for driving heat dissipation airflow in the first heat exchange cavity, the air cooling cavity and the second heat exchange cavity to circularly flow and flow through the liquid crystal light valve and the heat exchange device. In one embodiment, a first air channel is formed between the first lens and the liquid crystal light valve, a second air channel is formed between the liquid crystal light valve and the second lens, one end of the first air channel is communicated with one end of the second air channel through the first heat exchange chamber, the other end of the second air channel is communicated with the other end of the first air channel through the second heat exchange chamber, the fan is arranged in the second heat exchange chamber, the fan is provided with an air inlet and an air outlet, the air outlet is communicated with the first air channel, and the air inlet is communicated with the second air channel. In one embodiment, the heat exchange device comprises a first heat exchanger, the first heat exchanger comprises a first heat dissipation portion and a first heat exchange portion, the first heat exchange portion is arranged in the first heat exchange cavity, and the first heat dissipation portion is arranged outside the first heat exchange cavity. In one embodiment, the projection light machine further includes a first partition, one end of the first partition is in sealing fit with one side of the liquid crystal light valve, which is close to the first heat exchange chamber, the other end of the first partition extends towards the first heat exchange chamber, and a first space is formed between the first heat exchange chamber and a chamber wall, which is far away from the liquid crystal light valve, of the first heat exchange chamber, so that the first heat exchange chamber is partitioned into a third air channel, which is close to the light gathering piece, and a fourth air channel, which is far away from the light gathering piece, one end of the third air channel is communicated with the fourth air channel through the first space, the other end of the third air channel is communicated with the first air channel, and the