CN220964994U - Light valve heat abstractor of sealed ray apparatus of single LCD projector - Google Patents

Abstract

The utility model discloses a light valve heat dissipation device of a sealing light machine of a single LCD projector, which comprises a front phenanthrene mirror, a light valve module, a rear phenanthrene mirror, a light machine shell, a cross flow fan, a third air channel, a fourth air channel, a fifth air channel, a first heat exchanger and a second heat exchanger; a first air channel is formed between the front phenanthrene mirror and the light valve module and between the front phenanthrene mirror and the side wall of the optical machine shell; a second air channel is formed between the light valve module and the rear phenanthrene mirror and between the side wall of the optical machine shell; the first air channel, the third air channel, the second air channel, the fifth air channel, the cross flow fan and the fourth air channel are sequentially connected in series end to end and are communicated in a closed loop. The utility model can effectively stop the heat exchange dead zone of the traditional turbine fan for the air cooling and heat dissipation of the LCD light valve, realizes higher heat exchange efficiency and reduces fan noise by matching the wind resistance of the cross flow fan and the first to fifth wind channels, can effectively improve the heat dissipation effect of the LCD light valve, and keeps the volume of the heat dissipation device smaller.

Description

Light valve heat abstractor of sealed ray apparatus of single LCD projector

Technical Field

The utility model relates to the technical field of projectors, in particular to a light valve heat dissipation device of a sealing optical machine of a single LCD projector.

Background

Currently, the light valve of a single LCD projector generally has a transmittance of about 5% -8% for natural light, so that most of the light rays irradiated on the LCD light valve are absorbed by the LCD light valve and converted into joule heat, and the most common way in the industry is to cool the LCD light valve by forced air cooling.

When the LCD light valve size is larger (more than or equal to 4.5 inches), the use of a cross-flow fan is the most reasonable choice for LCD light valve heat dissipation. Single LCD projector product cases using crossflow blowers have been used for over twenty years: such as Otto code (Optoma) EP585 (LCD light valve 6.4 inch) marketed in 2001, beijing Oview (abbreviated as "Australian Marc View" Inc. in the meantime) ASP2150 (6.4 inch), CR680 (7 inch) marketed by Changsha Ind company in 2005, and the like.

The optical system and the heat dissipation air duct of the osram code EP585 and the osram ASP2150 projector are very similar, as shown in fig. 8, ai ' is the air intake (cool air from outside the machine) of the cross flow fan 4', ao ' is the air outlet (directly discharged into the outside atmosphere) of the heat dissipation air duct, and the cross flow fan 4' includes a guiding plate 44', a vortex tongue (vortex tongue) 45', an impeller 46' and other components. According to the light traveling direction, 59' is a reflecting bowl, 60' is a projection light source (Olympic code EP585 is a 350W metal halogen lamp), 61' is an aspheric lens, 66' is an illumination reflecting mirror, 2' is a front phenanthrene mirror, 1' is an LCD light valve, 3' is a rear phenanthrene mirror, 70' is a sheet metal air duct, light is emitted from the projection light source 60', is condensed by the reflecting bowl 59' and the aspheric lens 61', is reflected by the illumination reflecting mirror 66', is collimated by the front phenanthrene mirror 2', is modulated by the LCD light valve 1', and is further provided with an imaging reflecting mirror and a projection lens after being emitted by the rear phenanthrene mirror 3' (irrelevant to the display technology of the utility model, and not shown in fig. 8). The air outlet of the cross flow fan 4 'is tightly attached to and blows air against an air channel A formed between the LCD light valve 1' and the front phenanthrene mirror 2', an air channel B formed between the LCD light valve 1' and the rear phenanthrene mirror 3', the heat of the LCD light valve 1' (also an independent incident polaroid arranged in the air channel A and an independent emergent polaroid arranged in the air channel B, which are not shown in fig. 8) is taken away, and the heat is further dissipated to the reflecting bowl 59', the projection light source 60' and the aspheric lens 61 'through the sheet metal air channel 70', and then is discharged to the atmosphere. The difference between the aoview 2150 and the aographic code EP585 is: between the outlet of the sheet metal air duct 70 'and the outlet of the projector housing 7', the aoshi ASP2150 is further provided with two axial fans (not shown in fig. 8) in parallel for exhausting air, so that the hot air can be discharged out of the projector more smoothly.

It can be said that, since the CR680 projector was stopped in 2006, no single LCD projector has been used for a cross-flow fan in the market (e.g., jindong, tianmao, amazon, etc. online and all-channel offline markets), which is technically because some engineering problems of the conventional turbo fan are solved, and many times the desired effect cannot be obtained. It is therefore an object of the present utility model how to apply a crossflow blower and actually exert its positive effects with reference to past experience in combination with the current practice.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art and provides a light valve heat dissipation device of a single LCD projector sealing optical machine, which can effectively eliminate a heat exchange dead zone of the traditional turbine fan on LCD light valve air cooling heat dissipation, realize higher heat exchange efficiency and reduce fan noise through wind resistance matching of a cross flow fan and five air channels, effectively improve the heat dissipation effect of the LCD light valve and keep the volume of the heat dissipation device smaller.

In order to achieve the above objective, the present utility model provides a light valve heat dissipation device of a sealed optical engine of a single LCD projector, which comprises a front phenanthrene mirror, a light valve module, a rear phenanthrene mirror, an optical engine housing, a cross-flow fan, a third air channel, a fourth air channel, a fifth air channel, a first heat exchanger and a second heat exchanger.

The light valve module comprises an LCD light valve and a structural support, wherein the LCD light valve is embedded in the structural support; the front phenanthrene mirror, the light valve module and the rear phenanthrene mirror are positioned in the light machine shell, and the front phenanthrene mirror, the light valve module and the rear phenanthrene mirror are sequentially arranged according to the light travelling direction.

A first air channel is formed between the front phenanthrene mirror and the light valve module and between the front phenanthrene mirror and the side wall of the optical machine shell; and a second air channel is formed between the light valve module and the rear phenanthrene mirror and between the side walls of the optical machine shell.

An inlet of the third air channel is butted with an outlet of the first air channel, and an outlet of the third air channel is butted with an inlet of the second air channel; the outlet of the fourth air duct is butted with the inlet of the first air duct, and the inlet of the fourth air duct is butted with the air outlet of the cross flow fan; the inlet of the fifth air duct is butted with the outlet of the second air duct, and the outlet of the fifth air duct is butted with the air inlet of the cross flow fan.

The outlet of the first air duct is adjacent to the inlet of the second air duct, the flow direction of the air flow in the first air duct is from one long side to the other long side of the LCD light valve, and the flow direction of the air flow in the second air duct is from the other long side to the one long side of the LCD light valve.

The first heat exchanger comprises a first heat absorption part, a first heat transfer part and a first heat release part, and two ends of the first heat transfer part are respectively connected with the first heat absorption part and the first heat release part; the second heat exchanger comprises a second heat absorption part, a second heat transfer part and a second heat release part, and two ends of the second heat transfer part are respectively connected with the second heat absorption part and the second heat release part.

The first heat absorption part is arranged in the fourth air duct; the second heat absorbing part is arranged in the fifth air duct; the first heat release part and the second heat release part are arranged outside the optical machine shell.

Preferably, the first heat transfer portion and the second heat transfer portion are any one of a heat pipe, a combination of a heat pipe and a metal plate, or a phase change suppressing plate.

Preferably, the first heat absorbing portion and the second heat absorbing portion are any one of straight rib profiles, buckles Fin or wavy fins.

The beneficial effects of the utility model are as follows:

The utility model can effectively stop the heat exchange dead zone of the traditional turbine fan for the air cooling and heat dissipation of the LCD light valve, realizes higher heat exchange efficiency and reduces fan noise by matching the wind resistance of the cross flow fan and the five air channels, can effectively improve the heat dissipation effect of the LCD light valve, and keeps the volume of the heat dissipation device smaller.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of a first air duct and a second air duct according to an embodiment of the present utility model;

FIG. 3 is a perspective view showing the structure and flow field of a crossflow blower in an embodiment of the utility model;

FIG. 4 is a perspective view showing a first heat exchanger according to the present utility model;

FIG. 5 is a schematic diagram illustrating wind flow analysis of a cross flow fan and a first heat absorption portion according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a structure and flow field of a prior art turbofan;

FIG. 7 is a schematic diagram of a prior art turbine fan and heat exchanger heat sink wind flow analysis;

fig. 8 is a schematic diagram of a single LCD projector heat dissipation duct using a crossflow blower in the early stage.

Detailed Description

In order that those skilled in the art may better understand the technical solutions of the present utility model, the following detailed description of the present utility model with reference to the accompanying drawings is provided for exemplary and explanatory purposes only and should not be construed as limiting the scope of the present utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

It should be noted that, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to an azimuth or a positional relationship based on that shown in the drawings, or that the inventive product is commonly put in place when used, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Since most practitioners in the industry do not experience the earlier times of domestic projectors at present, further supplementation of the technical background of the industry is necessary. The domestic single LCD projector has been in the past twenty years (as counted when ASP2150 is introduced in the mass production of aoshi) and has undergone the times of cross-flow fans (see the foregoing background art), axial flow fans (about 2002-2009), turbo fans (about 2009-to-date) and the like for radiating heat from the LCD light valve. The axial flow fan is rarely used in the industry for heat dissipation of LCD light valves, and therefore, the description is omitted.

The practice of using one or more turbo fans proves that it is not preferable to dissipate heat from the LCD light valve over 4.5 inches. When the turbine fan blows air to the first air duct 11 or the second air duct 12 (see fig. 1), the turbine fan has a very complex flow field mechanism, and a heat exchange dead zone (analyzed by the chinese patent publication No. CN115079494 a) is necessary for the LCD light valve in an actual product, which is behind the market's expectation for efficient and low-noise heat dissipation for the LCD light valve with a size of not less than 4.5 inches.

Referring to fig. 6 and 7, 21 'is a turbo fan, 41' is a partition board of a heat exchanger, 42 'is a heat absorption buckle Fin of the heat exchanger (a heat exchanger with a similar structure can be seen in chinese patent application number CN202220500634.3, etc.), when the turbo fan 21' blows air to the heat absorption buckle Fin42 '(see arrow in fig. 7), due to the extremely large existence of N2', multiple impacts and rebounds are naturally generated in the inside of the heat absorption buckle Fin42', i.e. in the long and narrow gaps between adjacent ribs, and the heat transfer probability of the air flow and the heat absorption buckle Fin42' is seemingly improved due to the increase of the impacts, and in fact, the increased huge wind resistance causes rapid wind pressure loss, further serious wind quantity damage is difficult to generate more effective heat dissipation to the LCD light valve, which is also a current common problem in the technology. In addition, since N1' (force of forward blowing), N2' and N3' (force of axial expansion of fan) have complex flow field relationship, and the length of the air outlet (rectangular cross section) of the wide-mouth (current 99% of projectors are all adopted) turbine fan 21' in the direction of N1' is often less than 5mm, the turbine fan 21' cannot provide uniform flow at the air outlet, which can increase difficulty in designing and manufacturing the heat absorbing buckle Fin42' (such as parameters of length L ', interval W ' of the buckle Fin, etc.).

Referring to fig. 3 and 5, a cross flow fan 4 (also referred to as a drum fan, a cross flow fan, etc. in the industry) is widely used in products related to production and life of people, such as indoor hanging machines of home air conditioners, which is one of typical applications of the cross flow fan. The crossflow blower 4 includes main components such as a motor 41, a right side plate 42, a left side plate 43, a volute 44, a volute tongue 45, and an impeller 46, which are all prior art and will not be described in detail.

Referring to the analysis of the crossflow blower 4 and the first heat absorption portion 211 of the first heat exchanger shown in fig. 3 and 5, arrows in fig. 5 indicate wind flow, and the first heat absorption portion 211 has a Fin structure. N1, N2 and N3 are vectors of three basic forces of the velocity field, N1 is a forward blowing force, N2 is an axial force rotating around the rotation axis of the cross flow fan 4, N3 is a force of expanding (or contracting) wind pressure in the length direction of the air outlet (axial direction of the motor 41), and in general, in the case that N3 is not significantly shortened in a free state or in the cross section length of the air duct after installation (such as the dimension of L1 relative to L4 in fig. 2), the negative effect is negligible; while the amount of N2 is very slight compared to the N2' component of the turbofan.

The cross flow fan 4 and the turbine fan 21' have some fluid mechanics commonalities, but the air inlet and outlet modes (when air passes through the fan) are completely different, so that the performance is basically different, and further effect differences can be brought about by different installation modes, for example, the impellers of the cross flow fan 4 and the turbine fan 21' are much smaller than N2' even if the diameters and the rotating speeds are the same, so that in the long and narrow gaps between the adjacent ribs at the first heat absorption part 211, the wind resistance caused by wind flow is much lower, the wind flow almost smoothly flows out of the long and narrow gaps of the first heat absorption part 211, namely the wind pressure and the flow loss are extremely low, and the effective heat dissipation of the LCD light valve 1 is utilized, and meanwhile, the extra noise is hardly generated.

In fig. 3, the flow beam of the cross flow fan 4 in the direction of the length (L4) of the air outlet is uniformly distributed and N2 is very small, and the single LCD projector, such as the first air duct 11 and the second air duct 12 shown in fig. 1 and 2, is long and narrow, and has relatively large wind resistance in general, so that the wind resistance of the air duct is designed to match with the wind resistance required by the cross flow fan 4, which is beneficial to reducing and counteracting the surge phenomenon of the cross flow fan 4 and working under the optimal working condition.

The width W4 (typically 12mm-15 mm) of the air outlet of the cross flow fan 4 in reality and the widths (typically 10-12 mm) of the first air duct 11 and the second air duct 12 of the LCD projector in reality have inherently good matching performance; however, the length L4 of the air outlet of the cross flow fan 4 can be flexibly customized within the range of 98mm-250mm, so that the cross flow fan has good matching performance on the L1 in figure 2. This will undoubtedly lead to a better heat dissipation efficiency.

Examples:

Referring to fig. 1-5, the light valve heat dissipation device of a sealed optical engine of a single LCD projector provided in this embodiment includes a front phenanthrene mirror 2, a light valve module, a rear phenanthrene mirror 3, an optical engine housing 5, a cross-flow fan 4, a third air duct 13, a fourth air duct 14, a fifth air duct 15, a first heat exchanger and a second heat exchanger.

The light valve module comprises an LCD light valve 1 and a structural support 6, wherein the LCD light valve 1 is embedded in the structural support 6, and because the LCD light valve 1 is often bare glass, the LCD light valve 1 is difficult to directly assemble on a projector, and a frame (the structural support 6) is needed to be made for fixing the LCD light valve 1 so as to facilitate the assembly, which is common knowledge of the structure of an LCD projector.

The front fresnel lens 2 (the fresnel lens on the incident side of the LCD light valve 1 is generally referred to as a "front fresnel lens" in the industry, and the fresnel lens on the exit side of the LCD light valve 1 is similarly referred to as a "rear fresnel lens"), the light valve module and the rear fresnel lens 3 are disposed in the light machine housing 5, and the front fresnel lens 2, the light valve module and the rear fresnel lens 3 are disposed in this order in the light traveling direction.

A first air duct 11 is formed between the front phenanthrene mirror 2 and the light valve module and between the side wall of the optical machine shell 5; the second air duct 12 is enclosed between the light valve module and the rear phenanthrene mirror 3 and between the side walls of the optical machine housing 5, which is also a ventilation and heat dissipation basic structure of the LCD projector, and will not be described again.

The inlet of the third air duct 13 is in butt joint with the outlet of the first air duct 11 (on the optical machine housing 5), and the outlet of the third air duct 13 is in butt joint with the inlet of the second air duct 12 (on the optical machine housing 5); the outlet of the fourth air duct 14 is in butt joint with the inlet (on the optical engine housing 5) of the first air duct 11, and the inlet of the fourth air duct 14 is in butt joint with the air outlet of the cross flow fan 4; the inlet of the fifth air duct 15 is in butt joint with the outlet of the second air duct 12 (on the optical machine housing 5), and the outlet of the fifth air duct 15 is in butt joint with the air inlet of the cross flow fan 4. Referring to arrows in fig. 1, closed-loop air circulation passages of (the air outlet of) the crossflow blower 4, the fourth air duct 14, the first air duct 11, the third air duct 13, the second air duct 12, the fifth air duct 15, and (the air inlet of) the crossflow blower 4 are further completed.

The outlet of the first air duct 11 is adjacent to the inlet of the second air duct 12, and the air flow in the first air duct 11 flows from one long side to the other long side of the LCD light valve 1, as in fig. 1, in the "bottom-up" direction, and the air flow in the second air duct 12 flows from the other long side to the one long side of the LCD light valve 1, as in fig. 1, in the "top-down" direction. LCD light valve 1 is not equal to 1 because of the aspect ratio, such as 4:3, 16: 9. 16:10, etc., so that the long side and the short side of the LCD light valve 1 are very specific objects, and will not be described again.

The first heat exchanger comprises a first heat absorption part 211, a first heat transfer part 212 and a first heat release part 213, wherein two ends of the first heat transfer part 212 are respectively connected with the first heat absorption part 211 and the first heat release part 213; the second heat exchanger includes a second heat absorbing portion 221, a second heat transferring portion 222, and a second heat releasing portion, and two ends of the second heat transferring portion 222 are respectively connected to the second heat absorbing portion 221 and the second heat releasing portion. Because this type of heat exchanger is already a relatively common design in the industry, no further description is given.

Referring to fig. 4, the first heat transfer portion 212 of this embodiment is preferably a phase change suppressing plate.

In this embodiment, the first heat absorbing portion 211 and the second heat absorbing portion 221 are any one of straight rib profiles, buckle Fin or wave fins (for wave fins, see chinese patent publication No. CN 218122453U).

In this embodiment, the first heat releasing portion 213 and the second heat releasing portion are any one of a profile, a buckle Fin, or a corrugated Fin.

In this embodiment, the first heat transfer portion 212 and the second heat transfer portion 222 are preferably but not limited to phase change suppressing plates, and the basic principle of the phase change suppressing (PHASE CHANGE Inhibited) plates can be described in chinese patent publication No. CN115576161 a; the first heat absorbing part 211, the second heat absorbing part 221, the first heat releasing part 213, and the second heat releasing part are preferably, but not limited to, button Fin.

The first heat absorbing part 211 of the first heat exchanger is arranged in the fourth air duct 14; the second heat absorbing part 221 of the second heat exchanger is disposed in the fifth air duct 15; the first heat release portion 213 of the first heat exchanger and the second heat release portion of the second heat exchanger are disposed outside the optical machine housing 5.

When the light from the projection light source and the condensing device (both not shown in the figure, this is a conventional optical device equipped with a single LCD projector optical system) irradiates the front phenanthrene mirror 2 and is collimated by the front phenanthrene mirror 2 (most of the light can pass through the front phenanthrene mirror 2) and irradiates the light valve module, and at this time, most of the light is absorbed by the LCD light valve 1 and converted into joule heat. If the heat dissipation is not performed on the LCD light valve 1, the temperature of the LCD light valve 1 will quickly rise to more than 75-100 ℃ after about 10s-30s (depending on the power of the projection light source and the environmental temperature), and the LCD light valve 1 will fail.

The hermetically sealed optical engine is usually provided with the optical device of the projector in the engine housing 5, so that the optical device and the atmosphere are kept airtight. An internal circulation air duct, an internal circulation fan and a heat exchanger are arranged in the optical machine shell 5. The LCD light valve 1, the heat absorption part of the heat exchanger and the internal circulation fan are arranged in the internal circulation air duct, the internal circulation fan operates, the air forced to circulate in the internal circulation air duct takes away the heat of the LCD light valve 1, the heat is transferred to the heat absorption part of the heat exchanger, and the heat is diffused into the atmosphere through the heat release part (arranged outside the light machine shell 5) of the heat exchanger. The full-sealed LCD projector is a basic principle of a full-sealed LCD projector, and products have already occupied a lot of market share in the industry and are not repeated.

After the crossflow blower 4 operates, the air flow returns to the crossflow blower 4 through the fourth air duct 14, the first air duct 11, the third air duct 13, the second air duct 12 and the fifth air duct 15 in sequence. In this process, the incident surface of the LCD light valve 1 is disposed in the first air duct 11, the exit surface is disposed in the second air duct 12, the wind flow and the two surfaces of the LCD light valve 1 exchange heat, and the heat of the LCD light valve 1 is transferred to the wind flow and then to the first heat absorbing portion 211 of the first heat exchanger and the heat absorbing portion 221 of the second heat exchanger.

The first heat absorbing part 211 of the first heat exchanger transfers heat to the first heat transferring part 212 and then to the first heat releasing part 213 disposed outside the optical machine housing 5; the second heat absorbing portion 221 of the second heat exchanger transfers heat to the second heat transfer portion 222, and further to the second heat releasing portion disposed outside the optical housing 5.

Generally speaking, the LCD projector is sealed outside the optical engine, and must also be disposed in an external fan (for example, to radiate the light source for projection), and the first heat-radiating portion 213 and the second heat-radiating portion are disposed in an air duct of the external fan, so as to complete the heat radiation process of the fully sealed optical engine.

In this embodiment, the size of the LCD light valve 1 is preferably but not limited to one of 4.5 inch, 5 inch and 5.8 inch light valves manufactured by the photo-electric production of the eastern or the friendship, and the latest 6.37 inch 4K light valve manufactured by the eastern company, the erdos B6 production line can be selected.

When the LCD light valve 1 is 4.5 inches, the commercial crossflow blower 4 has standard components (L4 length of about 98mm-102 mm) and is perfectly matched.

When the LCD light valve 1 is 5 inches, the L4 length is preferably about 110mm-115mm, which requires customization.

When the LCD light valve 1 is 6.37 inches, the commercial crossflow blower 4 has a standard (L4 length of about 145mm-148 mm) and is well matched.

It is clear that the crossflow blower 4 is much simpler than the axial and turbo blowers in terms of external velocity fields, but that the fluid velocity fields inside the crossflow blower 4 are much more complex. Meanwhile, when any fan is actually assembled into the projector, the parameters of the fan are essentially different from those of the fan which is directly placed in the atmosphere to run freely when the air duct with the actual parameters works, so that people can find that the heat dissipation air duct of the LCD light valve 1 is smooth and clear when the motor runs normally, but the heat dissipation effect is not ideal, and the fan is one of reasons that the cross flow fan is not adopted by the domestic LCD projectors on the market in recent decades.

The first air duct 11 and the second air duct 12 as shown in fig. 1 and 2 can be optimized in terms of heat dissipation design with very few dimensions because of the simultaneous consideration of optical performance. And the reasonable arrangement of the third air duct 13, the fourth air duct 14 and the fifth air duct 15 creates conditions for the wind resistance design of the optimal operation condition of the cross flow fan 4. Therefore, by designing the wind resistances of the three air channels (13, 14, 15) to be matched with the running wind resistance required by the cross flow fan 4, the phenomena of surging, stall and the like of the cross flow fan 4 can be reduced and counteracted to work in the optimal working condition. The cross flow fan 4 radiates heat to the LCD light valve 1 without dead zone, and the excellent heat radiation performance of the air flow passing through the heat absorption portion 211 of the first heat exchange can be objectively represented.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (3)

1. The light valve heat dissipation device of the sealed ray machine of the single LCD projector is characterized by comprising a front phenanthrene mirror (2), a light valve module, a rear phenanthrene mirror (3), a ray machine shell (5), a cross flow fan (4), a third air channel (13), a fourth air channel (14), a fifth air channel (15), a first heat exchanger and a second heat exchanger;

The light valve module comprises an LCD light valve (1) and a structural support (6), wherein the LCD light valve (1) is embedded in the structural support (6); the front phenanthrene mirror (2), the light valve module and the rear phenanthrene mirror (3) are positioned in the optical machine shell (5), and the front phenanthrene mirror (2), the light valve module and the rear phenanthrene mirror (3) are sequentially arranged according to the light travelling direction;

A first air duct (11) is formed between the front phenanthrene mirror (2) and the light valve module and between the side wall of the optical machine shell (5); a second air duct (12) is formed between the light valve module and the rear phenanthrene mirror (3) and between the side wall of the optical machine shell (5);

An inlet of the third air duct (13) is in butt joint with an outlet of the first air duct (11), and an outlet of the third air duct (13) is in butt joint with an inlet of the second air duct (12); an outlet of the fourth air duct (14) is in butt joint with an inlet of the first air duct (11), and an inlet of the fourth air duct (14) is in butt joint with an air outlet of the cross flow fan (4); an inlet of the fifth air duct (15) is in butt joint with an outlet of the second air duct (12), and an outlet of the fifth air duct (15) is in butt joint with an air inlet of the cross flow fan (4);

The outlet of the first air duct (11) is adjacent to the inlet of the second air duct (12), the flow direction of the air flow in the first air duct (11) is from one long side to the other long side of the LCD light valve (1), and the flow direction of the air flow in the second air duct (12) is from the other long side to the one long side of the LCD light valve (1);

The first heat exchanger comprises a first heat absorption part (211), a first heat transfer part (212) and a first heat release part (213), wherein two ends of the first heat transfer part (212) are respectively connected with the first heat absorption part (211) and the first heat release part (213); the second heat exchanger comprises a second heat absorption part (221), a second heat transfer part (222) and a second heat release part, wherein two ends of the second heat transfer part (222) are respectively connected with the second heat absorption part (221) and the second heat release part;

The first heat absorbing part (211) is arranged in the fourth air duct (14); the second heat absorbing part (221) is arranged in the fifth air duct (15); the first heat release part (213) and the second heat release part are arranged outside the optical machine shell (5).

2. The light valve heat sink of a single LCD projector sealing machine according to claim 1, wherein the first heat transfer portion (212) and the second heat transfer portion (222) are any one of a heat pipe, a combination of a heat pipe and a metal plate, or a phase change suppressing plate.

3. The light valve heat sink of a single LCD projector sealing machine according to claim 1, wherein the first heat absorbing portion (211) and the second heat absorbing portion (221) are any one of a straight rib profile, a buckle Fin or a wave Fin.