JP4874041B2 - Cooling device and projection display device - Google Patents

Description

  The present invention relates to a liquid cooling apparatus that cools a heat generating portion that generates heat with a coolant.

  2. Description of the Related Art Conventionally, a projection display apparatus including a light source such as a lamp that emits light with high brightness and a projection lens that projects light emitted from the light source onto a screen is generally widely known. Further, the projection display apparatus includes a liquid cooling device that cools the light source with a cooling liquid in order to efficiently suppress the influence of heat generated by the light source.

  Specifically, the liquid cooling device includes a flow path through which the cooling liquid flows and a radiator that cools the warmed cooling liquid. The liquid cooling device includes a reserve tank that temporarily stores coolant flowing into the radiator (hereinafter referred to as an upstream reserve tank), and a reserve tank that temporarily stores coolant flowing out from the radiator (hereinafter referred to as a downward reserve tank). Have

  An example of such a liquid cooling apparatus will be described with reference to FIG. As shown in FIG. 25, the liquid cooling device has a pipe 23 that connects a cooling target 25 such as a light source and the radiator 200, and cools the cooling target 25 by circulating the cooling liquid through the pipe 23. To do. In addition, when the pump 24 sends out the cooling liquid into the pipe 23, the cooling liquid circulates between the cooling target 25 and the radiator 200.

  The radiator 200 has a pipe 202 in the radiator through which the coolant passes, and heat radiating fins 203 that cool the coolant. Further, the heat radiating fins 203 are cooled by the wind blown by the fan 26.

  The liquid cooling device includes an up reserve tank 204 that temporarily stores the coolant flowing into the radiator 200 and a down reserve tank 205 that temporarily stores the coolant flowing out of the radiator.

  In addition, when the direction of gravity when the projection display apparatus is stationary is set to the vertical direction, the up reserve tank 204 is provided above the radiator 200, and the down reserve tank 205 is provided below the radiator 200. Is provided. As a result, the load on the pump 24 that sends the coolant into the pipe 23 is reduced.

  Since the vertical size of the projection display apparatus is limited, the vertical size of the ascending reserve tank 204 and the descending reserve tank 205 cannot be increased. On the other hand, it is necessary to increase the capacities (volumes) of the ascending reserve tank 204 and the descending reserve tank 205 in order to sufficiently secure the storage amount of the coolant.

  Therefore, in general, the size of the ascending reserve tank 204 and the descending reserve tank 205 in the left-right direction (horizontal direction) is larger than the size of the ascending reserve tank 204 and the descending reserve tank 205 in the vertical direction (gravity direction).

Further, a cooling liquid tank 201 for storing a cooling liquid is provided above the ascending reserve tank 204, and the cooling liquid is injected into the cooling liquid tank 201 from a water injection port. Note that an air layer is provided on the upper part of the coolant tank 201 in order to improve the circulation of the coolant (for example, Patent Document 1).
JP 2002-357803 A

  Here, as the projection display apparatus, a ceiling-hanging type or a portable type projection display apparatus may be considered. In a ceiling-suspended type or portable type projection display, the orientation of the projection display changes, so air may enter the pipe 23 or the like. As described above, when air enters the pipe 23 or the like, the flow rate of the cooling liquid decreases, and thus the cooling efficiency of the cooling target 25 decreases.

  In particular, in the above-described up reserve tank 204, since the size in the vertical direction (gravity direction) is smaller than the size in the horizontal direction (horizontal direction), when the orientation of the projection display device (that is, the liquid cooling device) changes, Air easily enters the piping 23 and the like.

  Therefore, the present invention has been made to solve the above-described problem, and even when the direction of the liquid cooling device is changed, it is possible to suppress air from entering the flow path of the cooling liquid. An object is to provide a liquid cooling apparatus.

  One feature of the present invention is that a liquid cooling device that is provided in a device having a heat generating portion that generates heat, cools the heat generating portion with a cooling liquid, cools the cooling liquid, and stores a cooling liquid tank that stores the cooling liquid. A radiator that communicates with the cooling liquid tank and the radiator, and includes a cooling pipe that is a flow path for the cooling liquid, and the cooling liquid tank in the horizontal direction when the apparatus is stationary, Provided adjacent to the radiator, the size of the coolant tank in the gravitational direction when the device is stationary is larger than the size of the coolant tank in the horizontal direction when the device is stationary This is the gist.

  “Standing the device” refers to installing the device on a horizontal plane without tilting the device.

  According to this feature, since the size of the coolant tank in the gravity direction is larger than the size of the coolant tank in the horizontal direction, air can be prevented from entering the cooling pipe even when the orientation of the liquid cooling device changes. can do. In addition, the capacity of the coolant tank can be ensured.

  One aspect of the present invention is summarized in that, in the above-described characteristics of the present invention, the cooling pipe communicates with a central portion of the coolant tank in a direction of gravity when the apparatus is stationary.

  According to this feature, since the cooling pipe communicates with the central portion of the cooling liquid tank in the direction of gravity, even if the liquid cooling device is turned upside down, air can be prevented from entering the cooling pipe. it can.

  One feature of the present invention is that, in the above-described feature of the present invention, the coolant tank spreads upward from the central portion when the gravity direction when the device is stationary is the vertical direction. The gist is to have a shape that spreads downward from the central portion.

  According to this feature, the cooling liquid tank has a shape that extends upward from the central portion and expands downward from the central portion, so that not only when the liquid cooling device is turned upside down, Even when the orientation of the apparatus changes in various directions, it is possible to further suppress the air from entering the cooling pipe.

  One feature of the present invention is that in the above-described feature of the present invention, in the case where the gravity direction when the apparatus is stationary is set to the vertical direction, the upper part of the coolant tank and the lower part of the coolant tank are The gist is that an inlet for injecting the coolant into the coolant tank is provided.

  According to such a feature, since the inlets are provided in the upper part of the cooling liquid tank and the lower part of the cooling liquid tank, even when the liquid cooling device is turned upside down, the upper part of the cooling liquid tank or the cooling liquid tank Any one of the inlets provided in the lower part of the opening opens upward. Therefore, the coolant can be easily injected into the coolant tank.

  One feature of the present invention is that, in the above-described feature of the present invention, the coolant tank is a pair of coolant tanks, and the pair of coolant tanks is provided with the radiator interposed therebetween. And

  According to this feature, since the pair of cooling liquid tanks are provided with the radiator interposed therebetween, it is possible to prevent air from entering the radiator.

  One feature of the present invention is that a liquid cooling device that is provided in a device having a heat generating portion that generates heat, and that cools the heat generating portion with a coolant, a pair of coolant tanks that store the coolant, and the cooling A radiator that cools the liquid; and a cooling pipe that communicates with the cooling liquid tank and the radiator and that is a flow path for the cooling liquid, and the pair of cooling liquid tanks place the device stationary. In the case where the weight direction in the case is the vertical direction, an upper tank provided above the radiator with the radiator interposed therebetween, and a lower tank provided below the radiator with the radiator interposed therebetween, A part of the upper surface of the tank projects above the other part of the upper surface of the upper tank, and a part of the lower surface of the lower tank is lower than the other part of the lower surface of the lower tank. Ri and out, the shape of the upper tank is summarized in that is the same as the shape of the lower tank.

  According to such a feature, a part of the upper surface of the upper tank protrudes upward from the other part of the upper surface of the upper tank. Air accumulates on a portion of the top surface. Therefore, even when the direction of the liquid cooling device changes, it is possible to suppress the air in the upper tank from entering the cooling pipe.

  Moreover, since the shape of the upper tank is the same as the shape of the lower tank, even when the liquid cooling device is turned upside down, it is possible to prevent air from entering the cooling pipe.

  One aspect of the present invention is the above-described aspect of the present invention, wherein a part of the lower surface of the upper tank projects downward from the other part of the lower surface of the upper tank, and a part of the upper surface of the lower tank is The gist of the invention is that it projects upward from the other part of the upper surface of the lower tank.

  According to such a feature, since a part of the upper surface of the lower tank projects upward from the other part of the upper surface of the lower tank, the upper surface of the lower tank projects upward from the other part of the upper surface of the lower tank. Air accumulates in a part of. Therefore, even when the direction of the liquid cooling device is changed, the air in the lower tank can be prevented from entering the cooling pipe.

  Moreover, since the shape of the upper tank is the same as the shape of the lower tank, even when the liquid cooling device is turned upside down, it is possible to prevent air from entering the cooling pipe.

  One aspect of the present invention is the above-described aspect of the present invention, wherein the cooling pipe communicates with a central portion of the upper tank and the lower tank in the direction of gravity when the apparatus is stationary. The upper tank and the lower tank have a shape that expands upward from the central portion and expands downward from the central portion when the direction of gravity when the device is stationary is set as the vertical direction. This is the gist.

  According to such a feature, the upper tank and the lower tank have a shape that spreads upward from the central portion and spreads downward from the central portion, so that not only when the liquid cooling device is turned upside down, Even when the direction of the liquid cooling device changes in various directions, it is possible to further suppress the air from entering the cooling pipe.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the direction of a liquid cooling device changes, the liquid cooling device which makes it possible to suppress that air enters into the flow path of a cooling liquid can be provided.

  Hereinafter, a liquid cooling apparatus according to an embodiment of the present invention will be described with reference to FIGS. For convenience of explanation, the same components as those of the conventional liquid cooling device shown in FIG. 25 may be denoted by the same reference numerals, and the description thereof may be omitted.

  In the following description, the gravity direction when the apparatus provided with the liquid cooling device is left is described as the vertical direction, and the horizontal direction when the apparatus provided with the liquid cooling device is left is described as the left and right direction. To do. “Standing the device” refers to installing the device on a horizontal plane without tilting the device.

[First Embodiment]
(Configuration of liquid cooling device)
FIGS. 1A and 1B are explanatory views showing an example of a liquid cooling apparatus according to an embodiment of the present invention. This liquid cooling device is configured to circulate the cooling liquid between the cooling target 25 (a heat generating part that generates heat) and the radiator part 21A. The radiator section 21A has a radiator internal pipe 21a having a zigzag shape, and a radiator fin section 21b around the radiator internal pipe 21a. A coolant tank 22A having a vertically long rectangular tube shape or a cylindrical shape is disposed on both the left and right sides of the radiator portion 21A. Each coolant tank 22A has a length (height) substantially the same as the length of the side surface of the radiator portion 21A, and a connection port (port) connected to the radiator internal pipe 21a at a substantially central portion in the vertical direction. 22a is formed. The vertical size of the coolant tank 22A is larger than the horizontal size of the coolant tank 22A. Further, a connection port (port) connected to the circulation coolant pipe 23 (cooling pipe) is also formed at a substantially central portion in the vertical direction of the coolant tank 22A. That is, the location which becomes the air pool part in each coolant tank 22A exists above the said connection port (port). Water inlets (also serving as air vents) are provided at the upper and lower ends of the coolant tank 22A. The circulation coolant pipe 23 is provided with a pump 24. The pump 24 circulates the coolant in the circulation coolant pipe 23 and the radiator pipe 21 a. The coolant cooled by the radiator portion 21A is guided to the liquid cooling jacket portion 25. An object to be cooled is disposed on the liquid cooling jacket portion 25. The coolant whose temperature has risen due to the removal of heat from the object to be cooled is guided to the radiator 21A through the circulating coolant pipe 23. The heat transmitted to the heat radiating fin portion 21b of the radiator portion 21A is taken away by the air blown from a fan (not shown).

  In the case of the liquid cooling apparatus having the above-described configuration, in each of the coolant tanks 22A, both in the normal arrangement of the radiator section 21A shown in FIG. The locations that become the air reservoirs are respectively present above the connection ports (ports), so that the liquid cooling device can be used upside down. In addition, even if the entire system of the liquid cooling device (a set of a radiator unit, a pump, etc.) is turned upside down, it is not necessary to change the pump reverse rotation or the like. In this liquid cooling device, each cooling liquid tank 22A is not limited to having the length (height) substantially the same as the length of the side surface of the radiator portion 21A, but may also have a short length (height). Good. Further, the connection port may be located at a location slightly deviated from the center. Further, the coolant tank may be integrated with the radiator unit, or may be separately attached to the radiator unit. Further, the fan may be integrated with the radiator unit, or may be separately attached to the radiator unit. The same applies to the configuration examples shown below.

[Second Embodiment]
(Configuration of liquid cooling device)
2A and 2B are explanatory views showing another example of the liquid cooling apparatus according to the embodiment of the present invention. This liquid cooling device is different from the liquid cooling device shown in FIG. 1 in that it includes a radiator portion 21B, and has the same configuration as the liquid cooling device shown in FIG. 1 in other points. . The radiator portion 21B is formed by arranging a plurality of radiator internal pipes 21c in parallel between the upper port portion and the lower port portion. And it has the radiation fin part 21b around the said piping 21c in a radiator. Further, the radiator internal pipe 21a drawn from the left end surface of the upper port portion of the radiator portion 21B is connected to a connection port (port) 22a located at the approximate center in the vertical direction of the left coolant tank 22A. A pipe 21a in the radiator drawn out from the right end surface of the lower port portion of 21B is connected to a connection port (port) 22a located substantially at the center in the vertical direction of the right coolant tank 22A. The liquid cooling device having such a configuration is an air reservoir in each of the coolant tanks 22A both in the normal arrangement of the radiator section 21B shown in FIG. 2A and in the upside down arrangement of the radiator section 21B shown in FIG. Each part becomes a part above the connection port (port), so that it can be used even if the liquid cooling device is arranged upside down.

[Third Embodiment]
(Configuration of liquid cooling device)
3A and 3B are explanatory views showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 1 is that the radiator internal pipe 21a and the circulating cooling liquid pipe 23 are directly connected without providing one of the two cooling liquid tanks 22A. is there. The liquid cooling apparatus having such a configuration is such that the air in one coolant tank 22A is arranged in the normal arrangement of the radiator section 21A shown in FIG. 3A and in the upside down arrangement of the radiator section 21A shown in FIG. The locations to be the reservoir portions are respectively present above the connection ports (ports), so that the liquid cooling device can be used upside down. The radiator pipe 21a that is directly connected may be formed straight and connected to the circulation coolant pipe 23.

[Fourth Embodiment]
(Configuration of liquid cooling device)
4A and 4B are explanatory views showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 2 is that one of the two cooling liquid tanks 22A is not provided. And the radiator internal piping 21a withdraw | derived from the left end surface of the upper side port part of the radiator part 21B is directly connected to the said cooling coolant piping 23. As shown in FIG. The liquid cooling apparatus having such a configuration is such that the air in one coolant tank 22B is disposed both in the normal arrangement of the radiator section 21B shown in FIG. 4A and in the upside down arrangement of the radiator section 21B shown in FIG. The locations to be the reservoir portions are respectively present above the connection ports (ports), so that the liquid cooling device can be used upside down. The radiator pipe 21a that is directly connected may be formed straight and connected to the circulation coolant pipe 23.

[Fifth Embodiment]
(Configuration of liquid cooling device)
FIG. 5 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 1 is that two cooling liquid tanks 22B are provided instead of the two cooling liquid tanks 22A. One coolant tank 22B is disposed in a bowl shape from the left side to the upper side of the radiator section 21A, and the other one coolant tank 22B is disposed in a bowl shape from the right side to the lower side of the radiator section 21A. ing. And the side part and the upper and lower side parts of each coolant tank 22B have substantially the same length (height) as the length of the side surface of the radiator 21A. A connection port (port) 22a connected to the in-radiator piping 21a is formed. Further, a connection port (port) connected to the circulation coolant pipe 23 is also formed at a substantially central portion in the vertical direction of the side portion. Each of the coolant tanks 22B has an oblique surface that is substantially orthogonal to a 45 ° oblique line between them, and has a water inlet (also serves as an air vent) in the oblique surface portion. Yes. With the liquid cooling device having such a configuration, not only an upside down arrangement but also an inclined arrangement of 45 °, for example, is possible. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22B. A water inlet may be provided in a vertical plane or a horizontal plane without forming the oblique plane. Further, the length of the side portion and the upper and lower sides of each coolant tank 22B may be shorter than the length of each side of the radiator portion 21A.

[Sixth Embodiment]
(Configuration of liquid cooling device)
FIG. 6 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 1 is that two cooling liquid tanks 22C are provided diagonally opposite. The coolant tank 22C has a rectangular tube shape or a cylindrical shape. Each of the coolant tanks 22C has a length (height) shorter than the length of the side surface of the radiator portion 21A, and a connection port (port) connected to the radiator pipe 21a at a substantially central portion in the vertical direction. ) 22a is formed. Further, a connection port (port) connected to the circulation coolant pipe 23 is also formed at a substantially central portion in the vertical direction of the coolant tank 22C. In other words, each of the coolant tanks 22C is located above the connection port (port). Moreover, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one cooling fluid tank 22C.

[Seventh Embodiment]
(Configuration of liquid cooling device)
FIG. 7 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling device shown in FIG. 1 is that a coolant tank 22D is provided on the upper side and the lower side of the radiator portion 21A. Each of the coolant tanks 22D has a length (width) substantially the same as the length of the upper and lower sides of the radiator portion 21A, and is obliquely arranged upward. The highest portion of the coolant tank 22D is formed at the right end position of each coolant tank 22D, and this portion becomes an air reservoir portion in the normal arrangement. Moreover, the lowest location of the coolant tank 22D is formed at the left end position of each coolant tank 22D, and this location becomes an air reservoir in the reverse arrangement. That is, a part (right end) of the upper surface of the cooling liquid tank 22D projects upward from the other part (left end) of the upper surface of the liquid cooling tank 22D. Further, a part (left end) of the lower surface of the cooling liquid tank 22D protrudes downward from the other part (right end) of the lower surface of the liquid cooling tank 22D. A connection port (port) connected to the circulation coolant pipe 23 is formed at a substantially central portion in the vertical direction of each coolant tank 22D. Further, the connection port (port) 22a connected to the radiator internal pipe 21a is formed on the lower surface of the right end in the upper coolant tank 22D, and is formed on the upper surface of the left end in the lower coolant tank 22D. Has been. In other words, the locations of the air reservoirs in the respective coolant tanks 22D exist above the connection ports (ports). In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22D.

[Eighth Embodiment]
(Configuration of liquid cooling device)
FIG. 8 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling device shown in FIG. 7 is that a coolant tank 22E is provided on the upper side and the lower side of the radiator portion 21A. Each of the coolant tanks 22E has a substantially rectangular tube shape or a substantially cylindrical shape whose central side protrudes vertically. That is, the highest part and the lowest part of the coolant tank 22E are formed at the central portion of each coolant tank 22E, and the highest part becomes an air reservoir in the normal arrangement, and the lowest part in the upside down arrangement. The location becomes an air reservoir. A connection port (port) connected to the circulation coolant pipe 23 is formed at a substantially central portion of the side surface of each coolant tank 22E. Further, a connection port (port) 22a connected to the in-radiator pipe 21a is also formed at a substantially central portion of the side surface of each coolant tank 22E. That is, the location which becomes an air pool part in each cooling fluid tank 22E exists above the said connection port (port), respectively. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one cooling fluid tank 22E.

[Ninth Embodiment]
(Configuration of liquid cooling device)
FIG. 9 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 1 is that a coolant tank 22F having a shape in which a central portion (portion forming portion) is constricted is used instead of the coolant tank 22A having a straight shape. It is a point that has. Locations that can be air reservoirs and locations that can be air reservoirs in the respective coolant tanks 22F are the connection ports 22a between the radiator internal pipes 21a and the respective coolant tanks 22F, the circulating coolant pipings 23, and the respective coolants. It exists on the left and right sides of the connection port with the tank 22F. That is, the coolant tank 22F has a shape that spreads upward from the central portion (portion where the connection port 22a is provided). The coolant tank 22F has a shape that expands downward from the center portion (portion where the connection port 22a is provided).

  Each of the coolant tanks 22F has, for example, the shape shown in FIGS. The coolant tank 22F shown in FIG. 10A has a shape in which a flat rectangular tube is constricted from two directions (the two surfaces on the non-constricted side are parallel to each other). The coolant tank 22F shown in FIG. 10B has a shape in which a square tube is bundled from four directions. The coolant tank 22F shown in FIG. 10C has a flat cylindrical shape (disc shape) centering on the connection port, and the connection port is located on the inner side of the edge position of the peripheral surface of the flat cylindrical shape. Exists. The coolant tank 22F shown in FIG. 10 (d) has a shape in which a vertically long cylindrical central portion is constricted, and the connection port is formed in the central portion (constricted position).

  FIGS. 11A and 11B show a state where the liquid cooling device shown in FIG. 9 is tilted. As described above, in the coolant tank 22F, the location that becomes the air reservoir and the location that can be the air reservoir are the connection port 22a between the radiator internal pipe 21a and each coolant tank 22F, and the circulating coolant pipe 23. Even when the radiator portion 21A is disposed at an angle other than ± 90 degrees, the air reservoir portion is present on the left and right sides of the connection port with each coolant tank 22F. And a portion that can be an air reservoir are present above the connection port. As a result, it is possible to almost certainly prevent air from being accumulated in the air reservoir portion and entering the pipe from the connection port into the pipe no matter how the liquid cooling device is tilted.

The shape of the coolant tank 22F is not limited to the shape shown in FIG. 10, and for example, the cross-sectional shape shown in FIG. 12 (a), the cross-sectional shape shown in FIG. 12 (b), or FIG. It may have the cross-sectional shape shown in c). That is, the location that becomes the air reservoir portion in the coolant tank 22F and the location that can become the air reservoir portion only need to be present on the left and right sides of the connection port. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22F.

[Tenth embodiment]
(Configuration of liquid cooling device)
FIG. 13 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 5 is that a cooling liquid tank 22G is provided instead of the cooling liquid tank 22B. The coolant tank 22G has a saddle shape similar to the coolant tank 22B. On the other hand, similar to the coolant tank 22F described above, the coolant tank 22G can serve as an air reservoir and an air reservoir in the side portion of the coolant tank 22G. The location is present on the left and right sides of the connection port. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one cooling fluid tank 22G.

[Eleventh embodiment]
(Configuration of liquid cooling device)
FIG. 14 is an explanatory view showing another example of the liquid cooling device according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 6 is that a cooling liquid tank 22H is provided instead of the cooling liquid tank 22C. The two coolant tanks 22H are arranged obliquely in the same manner as the coolant tank 22C. On the other hand, similar to the coolant tank 22F described above, a location that becomes an air reservoir portion of the coolant tank 22H and a location that can become an air reservoir portion. Is present on the left and right sides of the connection port. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one cooling fluid tank 22H.

[Twelfth embodiment]
(Configuration of liquid cooling device)
FIG. 15 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 7 is that a cooling liquid tank 22I is provided instead of the cooling liquid tank 22D. The two coolant tanks 22I are arranged on the upper side and the lower side of the radiator portion 21A in the same manner as the coolant tank 22D. On the other hand, like the coolant tank 22F described above, Locations that can become air reservoirs are enlarged on the left and right sides of the connection port. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22I.

[Thirteenth embodiment]
(Configuration of liquid cooling device)
FIG. 16 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 8 is that a cooling liquid tank 22J is provided instead of the cooling liquid tank 22E. The two coolant tanks 22J are arranged on the upper side and the lower side of the radiator portion 21A in the same manner as the coolant tank 22E. On the other hand, like the coolant tank 22F described above, Locations that can become air reservoirs are enlarged on the left and right sides of the connection port. For example, as shown in FIG. 18A, the coolant tank 22J has a substantially beer barrel shape (circular cross section), but may have a rectangular cross section. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22J.

[Fourteenth embodiment]
(Configuration of liquid cooling device)
FIG. 17 is an explanatory view showing another example of the liquid cooling apparatus according to the embodiment of the present invention. The difference from the liquid cooling apparatus shown in FIG. 8 is that a cooling liquid tank 22K is provided instead of the cooling liquid tank 22E. The two coolant tanks 22K are arranged on the upper side and the lower side of the radiator portion 21A in the same manner as the coolant tank 22E. On the other hand, as in the coolant tank 22F described above, Locations that can become air reservoirs are enlarged on the left and right sides of the connection port. For example, as illustrated in FIG. 18B, the coolant tank 22 </ b> K has a substantially cylindrical shape (circular cross section), but may have a rectangular tube cut shape or the like. In addition, in this structure, it is good also as a structure provided with the radiator part 21B, and can also be set as the structure which is not provided with one coolant tank 22K.

  Further, in the liquid cooling apparatus described above, each coolant tank is provided with two water injection ports (air venting portions) for forward placement and reverse placement, but it may be configured to have only one, or It is also possible to adopt a configuration in which the tank itself is not provided with a water inlet (air vent). Further, the coolant tank is not limited to the peripheral side of the radiator part 21, but may be located on the front side or the rear side of the radiator part 21 so as to be separated from the peripheral side (a position where the fan or the fan does not obstruct the blowing). Good.

[Fifteenth embodiment]
(Configuration of projection display device)
FIG. 19 is an explanatory view showing a configuration example in which a liquid cooling device is applied to a three-plate type projection display apparatus. This projection display apparatus includes three illumination devices 51R, 51G, and 51B. Each illumination device 51 includes an LED (light emitting diode) 11, a taper type rod integrator 12, a polarization conversion device 13, and a rod integrator 15 having a substantially rectangular parallelepiped shape. Each LED 11 is arranged on a liquid cooling jacket 25. A circulation cooling pipe 23 is connected in series to the liquid cooling jacket 25, and the cooling liquid from the radiator 21A is a liquid cooling jacket 25 for the red LED 11, a liquid cooling jacket 25 for the blue LED 11, and a green color. The liquid cooling jacket 25 for the LED 11 is circulated in this order. Each color light emitted from each illuminating device 51 is transmitted through each color liquid crystal display panel 1R, 1G, 1B, thereby generating each color video light. Each color image light is combined by the cross dichroic prism 2 to become color image light. This color image light is projected by the projection lens 3.

  In the configuration example shown in FIG. 19, the circulation coolant pipe 23 is connected in series to the three liquid cooling jackets 25, but they may be connected in parallel. In addition, the cooling liquid in the lowest temperature state that has come out of the radiator section 21A is led to the liquid cooling jacket 25 for the red LED 11. However, the invention is not limited to this. You may make it supply the cooling liquid of the lowest temperature state to Emitting Diode (LD) and LD (Laser Diode). Further, the liquid cooling device of the present invention can also be applied to a single-plate type projection display apparatus. The liquid cooling device of the present invention can also be applied to a projection type image display device in which the light source is a lamp. Not only the radiator unit 21A but also other radiator units can be used.

  FIG. 20 is an explanatory diagram showing an example of the arrangement relationship between the optical elements of the configuration in which the liquid cooling device is applied to the projection display apparatus and the components of the liquid cooling device, and corresponds to the configuration shown in FIG. It is supposed to be. FIG. 21 shows a configuration example in the case of performing air cooling for the projection display apparatus shown in FIG. If it is an air cooling device, it becomes a device of 3 systems (three fans are required), but if it is a liquid cooling device, it can be constituted as a device of 1 system.

[Sixteenth Embodiment]
The sixteenth embodiment of the present invention will be described below with reference to the drawings. In the sixteenth embodiment, differences between the fifteenth embodiment and the sixteenth embodiment will be mainly described.

  Specifically, in the fifteenth embodiment described above, the circulation coolant pipe is disposed so as to straddle the projection lens. In contrast, in the sixteenth embodiment, the circulation coolant pipe connects the LEDs in series without straddling the projection lens.

(Configuration of projection display device)
The configuration of the projection display apparatus according to the sixteenth embodiment of the invention will be described below. FIG. 22 is a diagram showing a projection display apparatus 100 according to the sixteenth embodiment of the present invention.

  As shown in FIG. 22, the projection display apparatus 100 includes a plurality of light sources (red light source 125R, green light source 125G and blue light source 125B), a plurality of taper rods (taper rod 112R, taper rod 112G and taper rod 112B), and a plurality of light sources. A liquid crystal panel (liquid crystal panel 101R, liquid crystal panel 101G, and liquid crystal panel 101B), a dichroic prism 102, and a projection lens 103 are included.

  The red light source 125R is an LED or the like that emits red light. Similarly, the green light source 125G is an LED that emits green light, and the blue light source 125B is an LED that emits blue light. Note that the red light source 125R, the green light source 125G, and the blue light source 125B are heat generating units (cooling targets) that generate heat.

The taper rod 112R homogenizes the red light emitted from the red light source 125R. Similarly,
The taper rod 112G homogenizes green light emitted from the green light source 125G, and the taper rod 112B homogenizes blue light emitted from the blue light source 125B.

  The liquid crystal panel 101R modulates red light homogenized by the taper rod 112R. Similarly, the liquid crystal panel 101G modulates green light homogenized by the taper rod 112G, and the liquid crystal panel 101B modulates blue light homogenized by the taper rod 112B.

  The dichroic prism 102 combines the red light emitted from the liquid crystal panel 101R, the green light emitted from the liquid crystal panel 101G, and the blue light emitted from the liquid crystal panel 101B, and guides the combined light to the projection lens 103.

  The projection lens 103 projects the combined light combined by the dichroic prism 102 onto a screen or the like.

  Here, the projection display apparatus 100 includes the liquid cooling apparatus shown in the first to fourteenth embodiments. Specifically, the liquid cooling device includes a radiator 121, a coolant tank 122, a circulating coolant pipe 123, and a pump 124.

  The radiator 121 is a device that cools the cooling liquid warmed by the heat generating portions such as the red light source 125R, the green light source 125G, and the blue light source 125B by using heat radiation fins. The heat dissipating fins provided in the radiator 121 are cooled by a fan 126 facing the outside of the projection display apparatus 100. The fan 126 cools not only the heat dissipating fins provided in the radiator 121 but also the entire interior of the projection display apparatus 100.

  The pair of coolant tanks 122 are tanks that store coolant. The shape and arrangement of the coolant tank 122 may be various shapes and arrangements as shown in the first to fourteenth embodiments described above.

  The circulation coolant pipe 123 is a coolant flow path provided in the vicinity of heat generating portions such as the red light source 125R, the green light source 125G, and the blue light source 125B. The circulation coolant pipe 123 communicates with the radiator 121, the pair of coolant tanks 122, and the pump 124. Further, the circulation coolant pipe 123 communicates with a liquid cooling jacket (not shown) in which the red light source 125R, the green light source 125G, and the blue light source 125B are arranged.

  The pump 124 is a device that sends out the coolant into the circulating coolant pipe 123.

  In addition, when cooling a some light source in series, it is preferable that the circulating coolant piping 123 is arrange | positioned so that the coolant cooled by the radiator 121 may cool a light source in order with high energy. The fan 126 is preferably provided in the vicinity of the radiator 121.

[Seventeenth embodiment]
The seventeenth embodiment of the present invention will be described below with reference to the drawings. In the sixteenth embodiment, differences between the sixteenth embodiment and the seventeenth embodiment will be mainly described.

  Specifically, in the sixteenth embodiment described above, the projection display apparatus has a plurality of LEDs. In contrast, in the seventeenth embodiment, the projection display apparatus includes a white lamp instead of the plurality of LEDs.

(Configuration of projection display device)
The configuration of the projection display apparatus according to the seventeenth embodiment of the invention will be described below. FIG. 23 is a diagram showing a projection display apparatus 100 according to a seventeenth embodiment of the present invention. In FIG. 23, it should be noted that the same reference numerals are given to the same components as those in the sixteenth embodiment (FIG. 22) described above.

  As shown in FIG. 23, the projection display apparatus 100 includes a white light source 125W that emits white light instead of the red light source 125R, the green light source 125G, and the blue light source 125B.

  The white light source 125W is a UHP lamp that emits white light. The white light source 125W is a heat generating part (a cooling target) that generates heat.

  The projection display apparatus 100 includes a homogenizing unit 140 instead of the tapered rod 112R, the tapered rod 112G, and the tapered rod 112B.

  The homogenizing means 140 includes a fly-eye lens, a condenser lens, and the like, and homogenizes white light emitted from the white light source 125W. The homogenizing means 140 may include PBS that aligns the polarization direction of white light emitted from the white light source 125W.

  The projection display apparatus 100 includes separation means (mirrors 131 to 135) for separating light emitted from the white light source 125W. The mirrors 131 to 135 may be dichroic mirrors configured to reflect only light having a predetermined wavelength, or polarizing mirrors configured to reflect only light having a predetermined polarization direction. There may be.

[Eighteenth embodiment]
The eighteenth embodiment of the present invention will be described below with reference to the drawings. In the eighteenth embodiment, a case where the projection display apparatus is suspended from the ceiling will be described.

(Mounting structure of the projection display)
Hereinafter, a mounting structure for a projection display apparatus according to an eighteenth embodiment of the present invention will be described with reference to the drawings. FIG. 24 is a diagram showing a mounting structure of the projection display apparatus 100 according to the eighteenth embodiment of the present invention. In FIG. 24, it should be noted that the same reference numerals are given to the same configurations as those in the above-described sixteenth embodiment (FIG. 22).

  As shown in FIG. 24, a projection fitting 320 is attached to the projection display apparatus 100, and the suspension fitting 320 is attached to an arm 330 fixed to a ceiling or the like.

  Thus, when the projection display apparatus 100 is suspended from the ceiling, the top and bottom of the coolant tank 122 are reversed. The projection display apparatus 100 is suspended from the ceiling with a predetermined inclination in order to display an image on the screen.

  According to each embodiment of the present invention, when the gravity direction in the case where the projection display apparatus 100 is installed is the vertical direction, the vertical size of the cooling liquid tank 122 is the horizontal direction of the cooling liquid tank 122. Since it is larger than the size, the possibility of air entering the circulating coolant pipe 123 can be reduced.

  Therefore, it is possible to suppress a decrease in cooling efficiency due to the coolant while ensuring the capacity of the coolant tank 122.

[Other Embodiments]
Further, the liquid cooling device of the present application is not limited to the one applied to the projection display apparatus, but can be applied to other devices having a heat generating member (such as LED and CPU) such as a personal computer. In particular, equipment that temporarily takes upside down during assembly, equipment that may be loaded upside down during transportation, equipment that may be used upside down during use (for example, a suspended type) The liquid cooling device of the present application can be suitably used in a video display device or the like, and an in-vehicle device (the device is inclined by the inclination of the vehicle). Also, a plurality of the above-mentioned projection type video display devices (rear projection televisions) are combined with a plurality of the above-mentioned projection type video display devices arranged upside down on the above-mentioned normal projection type video display devices. Thus, a multi-screen large image display device may be realized. Alternatively, by combining a plurality of the above-described projection-type video display devices (liquid crystal projectors) and a plurality of the above-mentioned projection-type video display devices arranged upside down on the above-mentioned regular-type projection video display devices A liquid crystal projector device that displays a high-definition image may be realized.

It is explanatory drawing which showed the liquid-cooling apparatus of embodiment of this invention, the figure (a) has shown the normal arrangement state, and the figure (b) has shown the up-down inverted arrangement state. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention, the same figure (a) has shown the normal arrangement state, and the same figure (b) has shown the up-down inverted arrangement state. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention, the same figure (a) has shown the normal arrangement state, and the same figure (b) has shown the up-down inverted arrangement state. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention, the same figure (a) has shown the normal arrangement state, and the same figure (b) has shown the up-down inverted arrangement state. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. FIGS. 4A to 4D are perspective views showing examples of the shape of the coolant tank 22F. 9A is an explanatory view showing a 45 ° oblique arrangement state of the liquid cooling apparatus shown in FIG. 9, and FIG. 9B shows a 90 degree oblique arrangement state of the liquid cooling apparatus shown in FIG. FIG. FIGS. 9A to 9C are cross-sectional views showing examples of the cross-sectional shape of the coolant tank 22F. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. It is explanatory drawing which showed the other example of the liquid cooling device of embodiment of this invention. FIG. 4A is a perspective view showing a shape example of the coolant tank 22J, and FIG. 4B is a perspective view showing a shape example of the coolant tank 22K. It is explanatory drawing which showed the example which applied the liquid cooling device of this invention to the projection type video display apparatus. It is explanatory drawing which showed the example which applied the liquid cooling device of this invention to the projection type video display apparatus. It is the reference figure which showed the case where an air-cooling apparatus is applied to a projection type video display apparatus. It is explanatory drawing which showed the example which applied the liquid cooling device of this invention to the projection type video display apparatus. It is explanatory drawing which showed the example which applied the liquid cooling device of this invention to the projection type video display apparatus. It is explanatory drawing which showed the attachment structure of the projection type video display apparatus to which the liquid cooling device of this invention was applied. It is explanatory drawing which showed the conventional liquid cooling device.

Explanation of symbols

21A, 21B Radiator section 21a Radiator piping 22A, 22B, 22C, 22D, 22E, 22F, 22G, 22H, 22I, 22J, 22K Coolant tank 23 Circulating coolant pipe 24 Pump 25 Liquid cooling jacket

Claims (3)

A liquid cooling device provided in a device having a heat generating part for generating heat, and cooling the heat generating part with a cooling liquid,
A coolant tank for storing the coolant;
A radiator for cooling the coolant;
The cooling fluid tank communicates with the radiator, and includes a cooling pipe that is a flow path for the cooling fluid,
The cooling liquid tank is provided adjacent to the radiator in the horizontal direction when the apparatus is stationary.
When the device is tilted, the wall surface in the coolant tank is tilted with respect to the direction of gravity when the device is stationary so as to prevent the air accumulated in the coolant tank from flowing into the cooling pipe. and,
The cooling pipe communicates with the central portion of the coolant tank in the direction of gravity when the apparatus is stationary.
The liquid cooling apparatus, wherein the cooling liquid tank has a shape that extends upward from the central portion and extends downward from the central portion . In the case where the gravity direction when the apparatus is stationary is set to the vertical direction, an inlet for injecting the cooling liquid into the cooling liquid tank is provided in the upper part of the cooling liquid tank and the lower part of the cooling liquid tank. The liquid cooling apparatus according to claim 1 , wherein the liquid cooling apparatus is provided. Projection display device, characterized in that it comprises a liquid-cooling device according to claim 1 or 2.

Images