Liquid cooling apparatus
a liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant includes; a coolant tank configured to store the coolant; a radiator configured to cool the coolant; and a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator. The coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically. A size of the coolant tank in a vertical direction is larger than a size of the coolant tank in a horizontal direction when the apparatus is disposed statically.
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This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-282890, filed on Sep. 28, 2005; prior Japanese Patent Application No. 2006-053568, filed on Feb. 28, 2006; and prior Japanese Patent Application No. 2006-258960, filed on Sep. 25, 2006; the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a liquid cooling apparatus configured to cool a heat unit generating heat, by coolant.
2. Description of the Related Art
A projection-type image display apparatus provided with a light source such as a lamp emitting the high brightness light and a projection lens projecting the light emitted from the light source on a screen is generally known. The projection type image display apparatus has a liquid cooling apparatus for cooling the light source by a coolant, for efficiently suppressing affection caused by heat that the light source generates.
Specifically the liquid cooling apparatus has a flow path where the coolant flows and a radiator cooling the coolant warmed. The liquid cooling apparatus also has a reserve tank (hereinafter, upper reserve tank) for temporarily storing the coolant flowed into the radiator and a reserve tank (hereinafter lower reserve tank) for temporarily storing the coolant flowed out from the radiator.
The liquid cooling apparatus will be described bellow with reference to
The radiator 200 has inner radiator pipes 202 where the coolant passes through, and a heat radiation fin 203 cooling the coolant. The heat radiation fin 203 is cooled by the wind that blew to the heat radiation fin 203 from fan 206.
The liquid cooling apparatus has an upper reserve tank 204 for temporarily storing the coolant flowed into the radiator and a lower reserve tank 205 for temporarily storing the coolant flowed out from the radiator.
The upper reserve tank 204 is arranged on upper side of the radiator 200 and the lower reserve tank 205 is arranged on lower side of the radiator 200, assuming a vertical direction as an up-down direction when the projection-type image display apparatus disposed statically. Accordingly, a load of the pump 24 pumping out the coolant into the pipe 23 will be decreased.
Since, a size of the projection-type image display apparatus in the up-down direction is restricted, sizes of the upper reserve tank 204 and the lower reserve tank 205 in the up-down direction are difficult to be enlarged. On the contrary, a capacity (a volume) of the upper reserve tank 204 and the lower reserve tank 205 need to be enlarged for saving enough amount of the stored coolant.
Therefore, sizes of the upper reserve tank 204 and the lower reserve tank 205 in a left-right direction (horizontal direction) are generally larger than the sizes of the upper reserve tank 204 and the lower reserve tank 205 in the up-down direction (vertical direction).
A coolant tank 201 storing the coolant is provided on upper side of the upper reserve tank 204, the coolant infused from an infusion opening. A layer of air is provided in upper portion of the coolant tank 201 to improve circulation characteristics of the coolant (for example, Unexamined Japanese Application No. 2002-357803).
As the projection-type image display apparatus, projection-type image display apparatuses of hanging from ceiling type and of mobile type exist. In the projection-type image display apparatuses of hanging from ceiling type and of mobile type, since directions of the projection-type image display apparatuses are changeable, air may go into the pipe 23 or the like. As the air goes into the pipe 23, a flow amount of the coolant will be decreased. Accordingly, efficiency for cooling the object to be cooled 25 is deteriorated.
Especially, in the upper reserve tank 204 described above, since the size in the up-down direction (vertical direction) is smaller than the size in the left-right direction (horizontal direction), the air will easily go into the pipe 23 when the direction of the projection-type image display apparatus (that is, the liquid cooling apparatus) varies.
SUMMARY OF THE INVENTIONAn aspect of a liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant includes; a coolant tank configured to store the coolant; a radiator configured to cool the coolant; and a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator. The coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically. A size of the coolant tank in a vertical direction is larger than a size of the coolant tank in a horizontal direction when the apparatus is disposed statically.
“Disposing the apparatus statically” is to dispose the apparatus on the horizontal surface without leaning the apparatus.
According this aspect, since the size of the coolant tank in a vertical direction is larger than the size of the coolant tank in a horizontal direction, the air merely goes into the coolant pipe, if the direction of the liquid cooling apparatus varies. The volume of the coolant tank can be sufficiently kept.
In an aspect of the liquid cooling apparatus according to above described aspect, the coolant pipe connects to a center portion of the coolant tank in a vertical direction when the apparatus is disposed statically.
According to this aspect, since the coolant pipe connects to a center portion of the coolant tank in a vertical direction, the air merely goes into the coolant pipe, if the liquid cooling apparatus is disposed upside down.
In an aspect of the liquid cooling apparatus according to above described aspect, the coolant tank has a shape expanding from the center portion to upper side and expanding from the center portion to lower side, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
According to this aspect, since the coolant tank has the shape expanding from the center portion to upper side and expanding from the center portion to lower side, the air merely goes into the coolant pipe, not only if the liquid cooling apparatus is disposed upside down but if the direction of the liquid cooling apparatus changes to various directions.
An aspect of the liquid cooling apparatus according to above described aspect further includes infusion openings for infusing the coolant into the coolant tank. The infusion openings are arranged on upper portion and lower portion of the coolant tank, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
According to this aspect, since the infusion openings are arranged on upper portion and lower portion of the coolant tank, one of the infusion openings faces toward upper side, if the liquid cooling apparatus is disposed upside down. Accordingly, the coolant is easily infused into the coolant tank.
In an aspect of the liquid cooling apparatus according to above described aspect, the coolant tank includes a pair of cooling tanks, and the pair of cooling tanks are arranged on the both side of the radiator.
According to this aspect, since the pair of cooling tanks are arranged on the both side of the radiator, the air merely goes into the radiator.
An aspect of a liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant includes; a pair of coolant tanks configured to store the coolant; a radiator configured to cool the coolant; and a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator. The pair of coolant tanks includes an upper tank arranged on upper side of the radiator and a lower tank arranged on lower side of the radiator, assuming a vertical direction as up-down direction when the apparatus is disposed statically. One part on an upper surface of the upper tank expands upper than other part on the upper surface of the upper tank, and one part on a lower surface of the lower tank expands lower than other part on the lower surface of the lower tank. A shape of the upper tank is identical with a shape of the lower tank
According to this aspect, since the one part on the upper surface of the upper tank expands upper than the other part on the upper surface of the upper tank, the air gathers around the one part on the upper surface of the upper tank which expands upper than the other part on the upper surface of the upper tank. Therefore, the air merely goes into the coolant pipe, if the direction of the liquid cooling apparatus varies.
Since the shape of the upper tank is identical with the shape of the lower tank, the air merely goes into the coolant pipe, if the liquid cooling apparatus is disposed upside down.
In an aspect of the liquid cooling apparatus according to above described aspect, one part on a lower surface of the upper tank expands lower than other part on the lower surface of the upper tank, and one part on an upper surface of the lower tank expands upper than other part on the upper surface of the lower tank.
According to this aspect, since the one part on an upper surface of the lower tank expands upper than the other part on the upper surface of the lower tank, the air gathers around the one part on the upper surface of the lower tank which expands upper than the other part on the upper surface of the lower tank. Therefore, the air merely goes into the coolant pipe, if the direction of the liquid cooling apparatus varies.
Since the shape of the upper tank is identical with the shape of the lower tank, the air merely goes into the coolant pipe, if the liquid cooling apparatus is disposed upside down.
In an aspect of the liquid cooling apparatus according to above described aspect, the coolant pipe respectively connects to center portions of the upper tank and the lower tank in a vertical direction when the apparatus is disposed statically. The upper tank and the lower tank respectively have shape expanding from the center portion to upper side and expanding from the center portion to lower side, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
According to this aspect, since the upper tank and the lower tank respectively have the shape expanding from the center portion to upper side and expanding from the center portion to lower side, the air merely goes into the coolant pipe, not only if the liquid cooling apparatus is disposed upside down but if the direction of the liquid cooling apparatus changes to various directions.
BRIEF DESCRIPTION OF THE DRAWINGS
Hereinafter, a liquid cooling apparatus of an embodiment of the present invention will be described based on FIGS. 2 to 25. Incidentally, for convenience of description, the same reference numerals are respectively given to the same constituents as the constituents of the liquid cooling apparatus of the conventional example shown in
A vertical direction when the apparatus provided with the liquid cooling apparatus is disposed statically will be described as an up-down direction, and a horizontal direction when the apparatus provided with the liquid cooling apparatus is disposed statically will be described as a left-right direction. “Disposing the liquid cooling apparatus” is to dispose the liquid cooling apparatus on the horizontal surface without leaning the liquid cooling apparatus.
FIRST EMBODIMENT(Configuration of Liquid Cooling Apparatus)
With the liquid cooling apparatus of the above-described configuration, the portions to serve as the air pockets in the respective coolant tanks 22A will always exist above the respective connection openings (ports), either in the regular arrangement of the radiator 21A shown in
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
Each of the coolant tanks 22F has one of shapes shown in
The shape of the coolant tank 22F is not limited to the shapes shown in
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
(Configuration of Liquid Cooling Apparatus)
Moreover, in the liquid cooling apparatuses described above, each of the coolant tanks includes two infusion openings respectively used for the regular arrangement and for the upside down arrangement, however, it also serves a purpose that the coolant tank is configured to include only one infusion opening, or that the coolant tank itself is configured not to include a infusion opening. Moreover, the coolant tank may be positioned not only in the surroundings of the radiator 21, but also, away from the surroundings, in front of or behind the radiator 21 (positions should keep out of the way of a fan or air blown by the fan).
FIFTEENTH EMBODIMENT(Configuration of Projection-Type Image Display Apparatus)
Although, in the configuration example shown in
Hereinafter, a sixteenth embodiment of the present invention will be described with reference to the drawing. Note that the difference from above described fifteenth embodiment will be described mainly.
Specifically, in the above described fifteenth embodiment, the coolant circulation pipe is arranged so as to step over the projection lens. On the contrary, in the sixteenth embodiment, the coolant circulation pipe is connects each LEDs in series without stepping over the projection lens.
(Configuration of Projection-Type Image Display Apparatus)
Hereinafter, a configuration of the projection-type image display apparatus according to the sixteenth embodiment of the present invention will be described.
As shown in
The red light source 125R is such as an LED emitting the red light. Similarly, The green light source 125G is such as an LED emitting the green light and the blue light source 125B is such as an LED emitting the blue light. The red light source 125R, the green light source 125G, and the blue light source 125B are heat units generating heat (objects to be cooled).
The tapered rod integrator 112R unifies the red light emitted from the red light source 125R. Similarly, the tapered rod integrator 112G unifies the green light emitted from the green light source 125G and the tapered rod integrator 112B unifies the blue light emitted from the blue light source 125B.
The liquid crystal panel 101R modulates the red light unified by the tapered rod integrator 112R. Similarly, the liquid crystal panel 101G modulates the green light unified by the tapered rod integrator 112G and the liquid crystal panel 101B modulates the blue light unified by the tapered rod integrator 112B.
The dichroic prism 102 combines the red light went out from the liquid crystal panel 101R, the green light went out from the liquid crystal panel 101G, and the blue light went out from the liquid crystal panel 101B. The dichroic prism 102 guides the combined light toward the projection lens 103.
The projection lens 103 projects the combined light combined by the dichroic prism 102 on a screen or the like.
Here, the projection-type image display apparatus has one of the liquid cooling apparatuses described in the first to fourteenth embodiments. Specifically, the liquid cooling apparatus has the radiator 121, the coolant tank 122, the coolant circulation pipe 123, and a pump 124.
The radiator 121 cools the coolant warmed by the heat unit such as the red light source 125R, the green light source 125G, or the blue light source 125B, by means of the heat radiation fins. A fan 126 facing outside of the projection-type image display apparatus 100 cools the heat radiation fins provided on the radiator 121. The fan 126 cools not only the heat radiation fins but also inner of the projection-type image display apparatus 100 entirely.
The coolant tank 122 stores the coolant. As described in the first to fourteenth embodiment, various arrangements and shapes can be adopted as the arrangement and the shape of the coolant tank 122,
The coolant circulation pipe 123 is a flow path of coolant provided around the heat unit such as the red light source 125R, the green light source 125G, and the blue light source 125B. The coolant circulation pipe 123 connects to the radiator 121, the pair of coolant tanks 122, and pump 124. The coolant circulation pipe 123 connects jacket unit (not shown) where the red light source 125R, the green light source 125G, and the blue light source 125B are arranged.
The pump 124 pumps out the coolant into the coolant circulation pipe 123.
The coolant circulation pipe 123 is preferably arranged so that the coolant cooled by the radiator 131 cools the light source having the high energy in sequence, when the light sources are cooled in series. The fan 126 preferably arranged around the radiator 121.
SEVENTEENTH EMBODIMENTHereinafter, a seventeenth embodiment of the present invention will be described with reference to the drawing. Note that the difference from above described sixteenth embodiment will be described mainly.
Specifically, in the above described sixteenth embodiment, the projection-type image display apparatus has the plurality of the light sources. On the contrary, in the seventeenth embodiment, the projection-type image display unit has single white lamp for the replacement of the plurality of the light sources.
(Configuration of Projection-Type Image Display Apparatus)
Hereinafter, a configuration of the projection-type image display apparatus according to the sixteenth embodiment of the present invention will be described.
As shown in
The white light source 125W is such as an UHP lamp emitting the white light. The white light source is a heat unit generating heat (an object to be cooled).
The projection-type image display unit includes a unifying means 140 for the replacement of the tapered rod integrator 112R, the tapered rod integrator 112G, and the tapered rod integrator 112B.
The unifying means 140 is configured of fly-eye lens, condenser lens, or the like, and unifies the white light emitted from the white light source 125W. The unifying means may be includes a PBS (Polarized Beam Splitter) integrates a polarization direction of the white light emitted from the white light source 125W.
The projection-type image display unit includes a separating means (a mirror 131 through a mirror 135). The mirror 131 through the mirror 135 may be dichroic mirrors configured to reflect light having specific wavelength, and may be polarized mirrors configured to reflect light having specific polarization direction.
EIGHTEENTH EMBODIMENTHereinafter, an eighteenth embodiment of the present invention will be described with reference to the drawing. In the eighteenth embodiment, the projection-type image display apparatus hanged from the ceiling will be described.
(Attachment Structure of Projection-Type Image Display Apparatus)
Hereinafter, the attachment structure of the projection-type image display apparatus 100 according to the eighteenth embodiment of the present invention will be described.
As shown in
According to the respective embodiments, since the size of the coolant tank 122 in the up-down direction is larger than the size of the cooling tank 122 in the horizontal direction, the air merely goes into the coolant circulation pipe 123, assuming the vertical direction as the up-down direction when the projection-type image display apparatus 100 disposed statically.
Therefore, the decrease in cooling efficiency by the coolant can be suppressed, and the volume of the coolant tank 122 can be kept sufficiently.
OTHER EMBODIMENTSMoreover, the liquid cooling apparatus of the present application is not limited to applications to the projection-type image display apparatus, but can be applied to other apparatuses such as a personal computer including heat generating members (LED, CPU and the like). Particularly, the liquid cooling apparatus of the present application can be used suitably in devices such as: a device which is turned upside down even temporarily at the time of assembly; a device which may be loaded upside down at the time of transportation; a device which may be used upside down in some cases (for example, an image display device of a ceiling suspension type and the like); and an on-vehicle device (the apparatus will also be leaned due to the inclination of the vehicle). Moreover, by combining the plurality of above-described projection-type image display apparatuses arranged normally (rear projection television) with the plurality of above-described projection-type image display apparatuses arranged upside down on top of the projection-type image display apparatuses arranged normally, a large-sized image display device with a multi-screen may be realized. Alternatively, by combining the plurality of above-described projection-type image display apparatuses arranged normally (LCD projector) with the plurality of above-described projection-type image display apparatuses arranged upside down on top of the projection-type image display apparatuses arranged normally, an LCD projector for displaying a high definition image may be realized.
Claims
1. A liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant comprising:
- a coolant tank configured to store the coolant;
- a radiator configured to cool the coolant; and
- a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator; wherein,
- the coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically, and
- a size of the coolant tank in a vertical direction is larger than a size of the coolant tank in a horizontal direction when the apparatus is disposed statically.
2. The liquid cooling apparatus according to claim 1,
- wherein, the coolant pipe connects to a center portion of the coolant tank in a vertical direction when the apparatus is disposed statically.
3. The liquid cooling apparatus according to claim 2,
- wherein, the coolant tank has a shape expanding from the center portion to upper side and expanding from the center portion to lower side, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
4. The liquid cooling apparatus according to claim 2, further comprising infusion openings for infusing the coolant into the coolant tank,
- wherein, the infusion openings are arranged on upper portion and lower portion of the coolant tank, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
5. The liquid cooling apparatus according to claim 1, wherein,
- the coolant tank includes a pair of cooling tanks, and
- the pair of cooling tanks are arranged on the both side of the radiator.
6. A liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant comprising:
- a pair of coolant tanks configured to store the coolant;
- a radiator configured to cool the coolant; and
- a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator; wherein,
- the pair of coolant tanks includes an upper tank arranged on upper side of the radiator and a lower tank arranged on lower side of the radiator, assuming a vertical direction as up-down direction when the apparatus is disposed statically,
- one part on an upper surface of the upper tank expands upper than other part on the upper surface of the upper tank,
- one part on a lower surface of the lower tank expands lower than other part on the lower surface of the lower tank, and
- a shape of the upper tank is identical with a shape of the lower tank.
7. The liquid cooling apparatus according to claim 6, wherein,
- one part on a lower surface of the upper tank expands lower than other part on the lower surface of the upper tank, and
- one part on an upper surface of the lower tank expands upper than other part on the upper surface of the lower tank.
8. The liquid cooling apparatus according to claim 6, wherein,
- the coolant pipe respectively connects to center portions of the upper tank and the lower tank in a vertical direction when the apparatus is disposed statically, and
- the upper tank and the lower tank respectively have shape expanding from the center portion to upper side and expanding from the center portion to lower side, assuming a vertical direction as up-down direction when the apparatus is disposed statically.
Type: Application
Filed: Sep 27, 2006
Publication Date: Mar 29, 2007
Applicant: Sanyo Electric Co., Ltd. (Moriguchi)
Inventors: Nobuyuki Kondou (Moriguchi-City), Takashi Miwa (Higashi Osaka -City), Takashi Ikeda (Higashi Osaka -City)
Application Number: 11/527,399
International Classification: F28D 15/00 (20060101);