JP6326846B2 - projector - Google Patents

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, a projector including a circulating liquid cooling device that circulates a cooling liquid and cools a cooling target such as a liquid crystal panel is known (for example, see Patent Document 1).
In the liquid cooling device described in Patent Document 1, one liquid pumping unit provided in a cooling liquid flow path formed by a liquid circulation member sucks the cooling liquid through the suction port, and passes through the discharge port. The cooling liquid is circulated by pumping the cooling liquid.

JP 2010-243694 A

By the way, the projector may be used in a normal position with the lower surface facing down, or a reverse position with the lower surface facing up, or with the upper surface or side facing downward, May be used in various installation postures such as facing upward or tilting.
Among these postures, when the projector described in Patent Document 1 is installed in a posture in which the suction direction by the liquid pumping unit faces upward, bubbles mixed in the liquid circulation member are liquid when the liquid pumping unit is driven. It becomes easy to enter the pumping section. As described above, when bubbles enter the liquid pumping part, depending on the self-priming performance of the liquid pumping part, the gas accumulated inside cannot be discharged from the outlet and the cooling liquid may not be sucked. When such an event occurs, there is a problem that the cooling liquid is not properly circulated by the liquid pumping unit. Such a problem is particularly likely to occur in a projector that has been left for a long time and in which air has entered from a liquid circulation member formed of resin.

  An object of the present invention is to provide a projector that can appropriately circulate cooling liquid.

  The projector according to the first aspect of the present invention includes a plurality of liquid pumping units having a suction port for sucking a cooling liquid and a delivery port for sending the cooling liquid, and the suction ports included in each of the plurality of liquid pumping units, A liquid flow pipe that is connected to the delivery port and that guides the cooling liquid to a cooling target in a process in which the cooling liquid that circulates in the interior flows between the plurality of liquid feeding parts. When the first direction is the horizontal direction and the downward direction, the second direction is the horizontal direction and the upward direction. A first liquid pumping unit that sucks the cooling liquid in one direction, and a second liquid pumping unit that sucks the cooling liquid in the second direction in the predetermined installation posture.

  The direction facing downward is a direction that intersects the horizontal direction within a range of 180 degrees and faces downward. That is, the downward direction is a substantially downward direction. Also, the upward direction is a direction that intersects the horizontal direction within a range of 180 degrees and faces upward. That is, the upward direction is a substantially upward direction.

According to the first aspect, the plurality of liquid pumping units included in the projector include the first liquid pumping unit along the first direction in which the suction direction is one of the horizontal direction and the downward direction, and the suction And a second liquid pumping unit along the second direction whose direction is either the horizontal direction or the upward direction.
In such a configuration, when the projector is arranged in a predetermined installation posture, the first liquid pumping unit sucks the cooling liquid in the first direction. For this reason, even if bubbles are mixed in the flow path of the cooling liquid formed by the liquid circulation pipe, the bubbles are not easily sucked into the first liquid pumping unit. Thereby, about the at least 1st liquid pumping part of a some liquid pumping part, the gas which collected inside cannot be discharged | emitted and generation | occurrence | production of the problem that a cooling liquid cannot be attracted | sucked can be suppressed. Therefore, even when the above-described inconvenience occurs in the second liquid pumping unit, the cooling liquid can be circulated by driving the first liquid pumping unit.
On the other hand, when the projector is arranged in an upside down orientation with respect to the predetermined installation orientation, the suction direction of the second liquid pumping unit is either the horizontal direction or the downward direction. In this case, even if bubbles are mixed into the cooling liquid flow path, the bubbles are not easily sucked into the second liquid pumping unit. For this reason, similarly to the above case, the cooling liquid can be circulated by driving the second liquid pumping unit.
As described above, even if the installation posture of the projector changes, it is easy to set the suction direction of at least one of the first liquid pumping unit and the second liquid pumping unit to either the horizontal direction or the downward direction. Therefore, the occurrence of the inconvenience when the installation posture is changed can be suppressed. Therefore, the cooling liquid can be appropriately circulated and the cooling performance can be maintained.

In the first aspect, it is preferable that the suction direction of the first liquid pumping unit and the suction direction of the second liquid pumping unit face opposite sides.
According to the first aspect, since the suction direction of the first liquid pumping unit and the suction direction of the second liquid pumping unit are opposite to each other, the first liquid pumping unit can be used with respect to an arbitrary installation posture of the projector. The suction direction of at least one of the second liquid pumping unit can be set to any one of the horizontal direction and the downward direction. Therefore, the cooling liquid can be appropriately circulated regardless of the installation posture of the projector, and the cooling performance can be maintained.

  In the first aspect, the liquid circulation pipe includes a first connection portion connected to the suction port of the first liquid pumping portion and a second connection portion connected to the suction port of the second liquid pumping portion. The flow direction of the cooling liquid in the first connection portion in the predetermined installation posture is along the first direction, and the cooling liquid in the second connection portion in the predetermined installation posture Is preferably along the second direction.

According to the first aspect, since the flow direction in the first connection portion in the predetermined installation posture is along the first direction, the first liquid pumping portion is connected to the first connection when sucking the cooling liquid. The cooling liquid is moved in the first direction within the section. On the other hand, the second liquid pumping unit moves the cooling liquid in the second direction in the second connection unit. Accordingly, since the first liquid pumping unit does not need to suck the cooling liquid against the gravity, the load required for sucking the first liquid pumping unit can be reduced. Similarly, when the installation posture of the projector is inverted from the predetermined installation posture, the load on the second liquid pumping unit can be reduced.
That is, even if the installation posture of the projector changes, it is possible to suppress at least one of the first liquid pumping unit and the second liquid pumping unit from sucking the cooling liquid against gravity, and to reduce the load required for suction. .

In the first aspect, a plurality of tanks for storing the cooling liquid are provided, and the tanks are arranged upstream of the plurality of liquid pumping units in the flow path of the cooling liquid formed by the liquid circulation pipe. It is preferred that
According to the first aspect, in the cooling liquid flow path, the tank arranged on the upstream side of each liquid pumping unit can easily remove bubbles mixed in the liquid circulation pipe, Inflow of bubbles to the part can be suppressed.

  In the first aspect, a specifying unit that specifies a low-load pumping unit that is a liquid pumping unit that has a lower load than the other liquid pumping units among the plurality of liquid pumping units, and the specifying unit It is preferable to include a drive control unit that drives the low-load pumping unit specified by the following, and then drives the other liquid pumping unit.

In the first aspect, examples of the low load pumping unit include a liquid pumping unit whose suction direction is the first direction. In such a liquid pumping unit, as described above, it is possible to suppress a decrease in suction force due to bubbles entering inside.
According to the first aspect, after the cooling liquid is circulated by the specified low load pumping unit, the other liquid pumping unit that is driven at a higher load than the low load pumping unit (hereinafter also referred to as a high load pumping unit). Drive. Thereby, the liquid pumping part which can send out a cooling liquid can be driven more reliably, and a cooling liquid can be circulated more reliably.
Further, the high load pumping unit is driven after the cooling liquid is circulated without being driven first. As a result, the cooling liquid can surely flow into the high load pumping unit, so that the cooling liquid can be reliably sent out by the high load pumping unit, and the power consumption by driving the high load pumping unit can be reduced. Can be suppressed.

Or in the said 1st aspect, the specific means to identify the low load pumping part which is a liquid pumping part whose load at the time of attracting | sucking the said cooling liquid is lower than another liquid pumping part among these liquid pumping parts, Drive control for driving the plurality of liquid pumping units by increasing the feeding power of the cooling liquid by the low-load pumping unit specified by the specifying unit more than the feeding power of the cooling liquid by the other liquid pumping unit And means.
According to the said 1st aspect, a cooling liquid can be circulated more reliably by increasing the sending output of a low load pumping part.

Moreover, the inside of the high load pumping part may be filled with the bubble which flowed in. Even if the feeding force of such a liquid pumping unit is increased, there is a possibility that the gas cannot be discharged and the cooling liquid cannot be delivered. For this reason, even if power consumption increases, the circulation of the cooling liquid may not be promoted.
On the other hand, since the cooling liquid is circulated by increasing the feeding power of the low load pumping section, the cooling liquid can be surely flowed into the high load pumping section, and the cooling liquid is supplied by the high load pumping section. It can be surely sent out. For this reason, waste of power consumption due to an increase in the transmission output of the high load pumping unit can be suppressed.

In the first aspect, it is preferable that the specifying unit specifies the low load pumping unit based on an operating state of the plurality of liquid pumping units operated by the drive control unit.
According to the first aspect, the specifying unit specifies the low load pumping unit based on the operation states of the plurality of liquid pumping units operated by the drive control unit. Therefore, it is possible to more reliably identify the low load pumping unit according to the operation state of each liquid pumping unit.

In the first aspect, it is preferable that the specifying unit specifies the low load pumping unit based on at least one of a drive current value, an acceleration, and a noise value of each of the plurality of liquid pumping units.
Here, the magnitude of the load applied to the driving liquid pumping unit can be quantitatively specified by at least one of the driving current value, the acceleration, and the noise value.
For example, a liquid pumping unit having a large driving current value is a high load pumping unit that requires a large amount of power for driving, and a liquid pumping unit having a small driving current value is a low load pumping unit that requires a small amount of power for driving. It is possible.
Further, for example, a liquid pumping unit having a large acceleration or noise value is a high load pumping unit that vibrates violently, and a liquid pumping unit having a small acceleration or noise value is conversely a low load pumping unit. .
According to the first aspect, when specifying the low load pumping unit, the load of each liquid pumping unit can be quantitatively compared by using at least one of the drive current value, the acceleration, and the noise value. . Therefore, the low load pumping part can be identified more reliably.

In the first aspect, it is preferable that the specifying unit specifies the low load pumping unit based on an installation posture of the projector.
Here, the suction direction of the liquid pumping unit and the flow direction of the cooling liquid are determined with respect to the direction of the projector. For example, the liquid pumping unit whose suction direction is the first direction can be specified according to the installation posture among the plurality of liquid pumping units. Such a liquid pumping unit is considered to be a low load pumping unit as described above.
On the other hand, according to the said 1st aspect, the said low load pumping part can be specified appropriately by specifying a low load pumping part based on an installation attitude | position.
Further, by specifying the low load pumping unit based on the installation posture, the low load pumping unit can be specified without driving each liquid pumping unit. Therefore, when driving the stopped projector, the low load pumping unit can be specified in advance, and the cooling liquid can be circulated appropriately from the time of startup.

A projector according to a second aspect of the present invention includes a plurality of liquid pumping units having a suction port for sucking a cooling liquid and a delivery port for sending the cooling liquid, and the suction ports included in each of the plurality of liquid pumping units, And a liquid circulation pipe that is connected to the delivery port and guides the cooling liquid to a cooling target in a process in which the cooling liquid that circulates in the interior flows between the plurality of liquid pumping units.
Here, as the number of parts connected to the liquid circulation pipe increases, the flow path becomes narrower, or the flow path becomes longer, the load on the liquid pumping section when circulating the cooling liquid increases. There is a case.
On the other hand, according to the said 2nd aspect, by providing a some liquid pumping part, a cooling liquid can be circulated more reliably and sufficient cooling performance can be obtained.

FIG. 2 is a diagram illustrating an outline of an internal configuration of the projector according to the first embodiment. The block diagram which shows schematic structure of the liquid cooling device and control apparatus of the said embodiment. FIG. 2 is a plan view showing a liquid pumping unit arranged inside the projector of the embodiment. FIG. 3 is a side view showing a liquid pumping unit disposed inside the projector. The flowchart which shows the control processing of the liquid cooling device by the control apparatus of the said embodiment. The side view which shows the said projector arrange | positioned with a reverse placement attitude | position. The side view which shows the said projector arrange | positioned with an upward projection attitude | position. The side view which shows the said projector arrange | positioned with a downward projection attitude | position. The side view which shows the said projector arrange | positioned with a horizontal installation attitude | position. The side view which shows the said projector arrange | positioned with a horizontal installation attitude | position. The side view which shows the said projector arrange | positioned in a normal posture and inclined. The side view which shows the said projector arrange | positioned in an inverted posture and inclined. The side view which shows the said projector arrange | positioned in the horizontal attitude | position and incline. The side view which shows the said projector arrange | positioned in the horizontal attitude | position and incline. The block diagram which shows schematic structure of the modification of a liquid cooling device and a control apparatus. The flowchart which shows the control processing of the liquid cooling device by the control apparatus of the said modification. The block diagram which shows schematic structure of the modification of a liquid cooling device and a control apparatus. The block diagram which shows schematic structure of the modification of a liquid cooling device and a control apparatus. The flowchart which shows the modification of the control processing of the liquid cooling device by a control apparatus. The top view which shows the outline of the modification of the arrangement direction of a liquid pumping part. The top view which shows the outline of the modification of the arrangement direction of a liquid pumping part.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a schematic diagram showing a configuration of a projector 1 according to the first embodiment of the present invention.
The projector 1 projects an image according to image information onto a projection surface (not shown) such as a screen. As shown in FIG. 1, the projector 1 includes an exterior casing 2 constituting an exterior, an optical unit 3 housed in the exterior casing 2, a liquid cooling device 4 (see FIG. 2), and a gravity sensor 5. And a control device 6 (see FIG. 2) for controlling the optical unit 3 and the liquid cooling device 4.

[Configuration of exterior casing]
The exterior casing 2 is a casing made of metal or synthetic resin, and includes an upper surface portion 21 and a lower surface portion 22 that intersect with each other in the vertical direction, a front surface portion 23, a back surface portion 24, a right side surface portion 25, and a left side surface portion 26. Prepare.
Among these, the lower surface portion 22 faces the installation surface in a posture (orientation posture) in which the projector 1 is placed on an installation surface such as an installation table, and the lower surface portion 22 and the upper surface portion 21 are mutually connected. Opposite.
The front part 23 and the back part 24 are located on the front side and the back side of the exterior housing 2 in the above-described normal posture. The right side surface portion 25 and the left side surface portion 26 are positioned on the right side and the left side of the exterior housing 2 in the regular posture. Among these, in the front part 23, the projection optical device 35 which comprises the optical unit 3 and projects an image is exposed through an opening part.

  In the following description, an image projection direction by the optical unit 3 (projection optical device 35) is a Z direction, and directions orthogonal to the Z direction and orthogonal to each other are an X direction and a Y direction. In the present embodiment, the Y direction is a direction that faces upward when the projector is installed in the above-described normal posture (a direction from the lower surface portion 22 toward the upper surface portion 21), and the X direction is a projector in the normal posture. Is a direction from right to left as viewed from the front side (a direction from the right side surface portion 25 to the left side surface portion 26).

[Configuration of optical unit]
The optical unit 3 forms and projects an image according to the image information under the control of the control device 6 (see FIG. 2).
As shown in FIG. 1, the optical unit 3 includes a light source device 31, an illumination optical device 32, a color separation optical device 33, an electro-optical device 34, and a projection optical device 35.
As the light source device 31, one having a light source lamp 311 and a reflector 312, or one having a solid light source such as an LED (Light Emitting Diode) and an LD (Laser Diode) can be adopted.
The illumination optical device 32 equalizes the illuminance in a plane orthogonal to the central axis of the light emitted from the light source device 31, and includes lens arrays 321, 322, a polarization conversion element 323, and a superimposing lens 324.

The color separation optical device 33 separates each color light of red, green, and blue from incident light, and includes dichroic mirrors 331 and 332 and reflection mirrors 333 to 336.
The electro-optical device 34 modulates incident light. The electro-optical device 34 includes three incident-side polarizing plates 342, three liquid crystal panels 341 as light modulation devices (the liquid crystal panels for red, green, and blue light are 341R, 341G, and 341B), It has an exit-side polarizing plate 343 and a cross dichroic prism 344 as a color synthesis optical device.
The projection optical device 35 projects the image synthesized by the cross dichroic prism 344 onto the projection surface.

[Configuration of gravity sensor]
FIG. 2 is a block diagram showing an internal configuration of the projector 1 including the liquid cooling device 4, the gravity sensor 5, and the control device 6.
The gravity sensor 5 detects acceleration in three directions of the X, Y, and Z axes, and outputs the detection result to the control device 6. As will be described in detail later, based on the acceleration detection result by the gravity sensor 5, the low load specifying unit 61 of the control device 6 acquires the installation posture of the projector 1.

[Configuration of liquid cooling device]
The liquid cooling device 4 circulates a cooling liquid such as water or ethylene glycol, and cools an object to be cooled such as the liquid crystal panel 341 by the cooling liquid.
As shown in FIG. 2, the liquid cooling device 4 includes a first liquid pumping unit 41, a second liquid pumping unit 42, a first tank 43 and a second tank 44 as liquid storage units, and a heat exchange unit. 45 and a distribution pipe 46.

[Configuration of distribution pipe]
The flow pipe 46 has a plurality of tubular members through which the cooling liquid can flow, and the first liquid pumping section 41, the second liquid pumping section 42, the first tank 43, and the second tank by the plurality of tubular members. 44 and the heat exchange unit 45 are connected to form an annular channel through which the cooling liquid flows.
In the present embodiment, the flow pipe 46 includes first to fifth tubular members 46A to 46E.
The first tubular member 46A connects the outlet of the first tank 43 and the suction port 41A (see FIG. 3) of the first liquid pumping unit 41.
The second tubular member 46 </ b> B connects the outlet 41 </ b> B (see FIG. 3) of the first liquid pumping unit 41 and the inlet of the heat exchange unit 45.
The third tubular member 46C connects the outlet of the heat exchange unit 45 and the inlet of the second tank 44.
The fourth tubular member 46D connects the outlet of the second tank 44 and the suction port 42A (see FIG. 3) of the second liquid pumping unit 42.
The fifth tubular member 46 </ b> E connects the outlet 42 </ b> B (see FIG. 3) of the second liquid pumping unit 42 and the inlet of the first tank 43.

[Configuration of liquid pumping unit]
3 and 4 are schematic views showing the arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 in the above-described normal position. Among these, FIG. 3 is a diagram when the projector 1 is viewed along the direction opposite to the Y direction, and FIG. 4 is a diagram when the projector 1 is viewed along the direction opposite to the X direction. is there.
Although not shown, the first liquid pumping unit 41 has a configuration in which an impeller is disposed in a hollow member, and is a pump that sucks and pumps cooling liquid by rotating the impeller. That is, the first liquid pumping unit 41 sucks the cooling liquid through the suction port 41A connected to the first tubular member 46A located on the upstream side in the flow path of the cooling liquid, and the second tubular position located on the downstream side. The cooling liquid is pumped through the delivery port 41B connected to the member 46B.

The first liquid pumping unit 41 is configured such that the suction port 41A and the delivery port 41B face in the same direction. That is, the first liquid pumping unit 41 is configured such that the cooling liquid suction direction D1 and the cooling liquid delivery direction D2 are opposite to each other.
In this embodiment, as shown in FIGS. 3 and 4, the first liquid pumping unit 41 has a cooling liquid suction direction D1 opposite to the Z direction, and the suction direction D1 and delivery direction D2 are on the ZY plane. It arrange | positions inside the projector 1 so that it may follow. That is, when the projector 1 is arranged in the above-described normal posture so that the lower surface portion 22 is along the horizontal plane, the suction direction D1 and the delivery direction D2 are respectively along the horizontal direction.

The second liquid pumping unit 42 is configured in the same manner as the first liquid pumping unit 41, and includes a suction port 42A connected to the fourth tubular member 46D and a delivery port 42B connected to the fifth tubular member 46E. Have. Also in the second liquid pumping unit 42, the cooling liquid suction direction (suction direction D3) performed via the suction port 42A and the cooling liquid delivery direction (sending direction D4) performed via the delivery port 42B are also shown. ) Are directions opposite to each other.
Such a second liquid pumping unit 42 is disposed inside the projector 1 such that the suction direction D3 is the Z direction, and the suction direction D3 and the delivery direction D4 are along the ZY plane. That is, when the projector 1 is arranged in the above-described normal posture so that the lower surface portion 22 is along the horizontal plane, the suction direction D3 and the sending direction D4 are respectively along the horizontal direction. Further, the second liquid pumping section 42 is disposed closer to the tip end side in the Y direction than the first liquid pumping section 41 and closer to the tip end side in the X direction. Furthermore, although mentioned later in detail, the 1st liquid pumping part 41 and the 2nd liquid pumping part 42 are each arrange | positioned so that the suction direction D3 and the said suction direction D1 may become a mutually opposite direction.
In addition, as a structure of each liquid pumping part 41 and 42, you may employ | adopt not only the structure which has the impeller mentioned above but the other structure using a diaphragm.

[Configuration of the first tank]
The first tank 43 is formed of, for example, a substantially rectangular parallelepiped hollow member, and temporarily stores the flowing cooling liquid. The first tank 43 has an inlet and an outlet through which cooling liquid flows in and out. The fifth tubular member 46E is connected to the inlet, and the first tubular member 46A is connected to the outlet. It is connected. Then, the cooling liquid pumped from the second liquid pumping unit 42 flows into the first tank 43 through the inlet, and the cooling liquid stored therein passes through the first liquid pumping unit through the outlet. 41 is aspirated. That is, the first tank 43 is located downstream of the second liquid pumping unit 42 and upstream of the first liquid pumping unit 41 in the flow path of the cooling liquid. Such a 1st tank 43 is comprised from metal materials, such as aluminum, for example.

[Configuration of the second tank]
The second tank 44 has the same configuration and function as the first tank 43, the third tubular member 46C is connected to the inlet of the second tank 44, and the fourth tubular is connected to the outlet. The member 46D is connected. Then, the cooling liquid pumped from the first liquid pumping unit 41 through the heat exchange unit 45 flows into the second tank 44 through the inlet, and the cooling liquid stored inside passes through the outlet. And is sucked by the second liquid pumping unit 42. That is, the second tank 44 is located downstream of the first liquid pumping unit 41 and upstream of the second liquid pumping unit 42 in the cooling liquid flow path.

[Configuration of heat exchange unit]
The heat exchange unit 45 absorbs heat from the cooling liquid (cooling liquid heated by cooling the object to be cooled) flowing from the second tubular member 46B, and flows the cooled liquid whose temperature is lowered to the third tubular member 46C. Let Although not shown in detail in the heat exchange unit 45, the heat exchanger connected to the second tubular member 46B and the third tubular member 46C, a partition plate connected to the heat exchanger, A Peltier element as a thermoelectric conversion element taken on the partition plate, and a heat radiation side heat transfer member in contact with the Peltier element.
In the heat exchange unit 45, the cooling liquid is absorbed by the Peltier element through the partition plate and cooled in the process of flowing through the heat exchanger. The heat absorbed by the Peltier element is transferred to the heat radiation side heat transfer member. Cooling air is blown to the heat radiating side heat transfer member by a fan (not shown), thereby cooling the heat radiating side heat transfer member.
The connection position of the heat exchange unit 45 may be between the second liquid pumping unit 42 and the first tank 43.

Further, as shown in FIG. 4, the flow path of the cooling liquid formed by the first tubular member 46A is at the same position in the Y direction as the suction port 41A or at the front end side in the Y direction.
On the other hand, the flow path of the cooling liquid formed by the fourth tubular member 46D has the same position in the Y direction as the suction port 42A or on the proximal end side in the Y direction.

  Thus, in this embodiment, the cooling liquid follows the first liquid pumping unit 41 to the heat exchange unit 45 to the second tank 44 to the second liquid pumping unit 42 to the first tank 43 by the flow pipe 46, and again, An annular channel C returning to the first liquid pumping unit 41 is formed.

[Configuration of control device]
The control device 6 includes hardware such as a CPU (Central Processing Unit), a RAM (Random Access Memory), and a flash memory, and controls the operation of the projector 1. For example, the control device 6 controls the optical unit 3 to form and project an image according to the image information. Further, the control device 6 controls the liquid cooling device 4. Therefore, as shown in FIG. 2, the control device 6 includes a storage unit 63 configured by the RAM and the flash memory, and also includes a low-load specifying unit 61 and a drive control unit 62 as functional units.
The storage unit 63 stores various programs and data necessary for controlling the projector 1. For example, the storage unit 63 stores a control program for executing control processing of the liquid cooling device 4 to be described later, and the CPU executes the control program, whereby the low load specifying unit 61 and the drive control unit are stored. 62 is realized.

The low load specifying unit 61 corresponds to specifying means of the present invention. The low-load specifying unit 61 grasps the attitude of the projector 1 based on the detection result by the gravity sensor 5, and the load of the first liquid pumping unit 41 and the second liquid pumping unit 42 is based on the attitude. A low liquid pumping part (low load pumping part) is specified.
Specifically, the low load specifying unit 61 first acquires the detection result of the acceleration in the three directions by the gravity sensor 5, and grasps the installation posture of the projector 1 (that is, the inclination with respect to the vertical direction and the horizontal direction). Thereafter, the low-load specifying unit 61 is a liquid pumping unit in which the cooling liquid suction direction is in the horizontal direction among the first liquid pumping unit 41 and the second liquid pumping unit 42, or 180 degrees with respect to the horizontal direction. The liquid pumping unit that intersects at the angle within and faces downward is specified as the low load pumping unit. This is because the load at the time of suction is less in the liquid pumping unit that is downward than the liquid pumping unit in which the cooling liquid suction direction is upward.
In addition, when the load states of the first liquid pumping unit 41 and the second liquid pumping unit 42 are the same, at least one of the first liquid pumping unit 41 and the second liquid pumping unit 42 is set to the low load pumping unit. Is specified.

The specification of the low load pumping unit by the low load specifying unit 61 is performed as follows, for example. That is, the low load specifying unit 61 detects the installation posture of the projector 1, that is, the inclination with respect to the horizontal direction or the vertical direction, based on the detected direction of gravity, and specifies the low load pumping unit according to the installation posture.
Further, for example, a data table in which the gravity direction and the data indicating which of the liquid pumping units 41 and 42 is the low load pumping unit in the gravity direction is stored in the storage unit 63 in advance. The low load specifying unit 61 may specify the low load pumping unit using the detection result of the direction of gravity and the data table.

  The drive control unit 62 corresponds to the drive control means of the present invention, and controls the operation of the liquid pumping units 41 and 42. Specifically, when driving the liquid cooling device 4, the drive control unit 62 drives the low load pumping unit specified by the low load specifying unit 61 for a predetermined time before the other liquid pumping units. And after predetermined time progress, the drive control part 62 drives each liquid pressure feeding part, respectively.

[Control of liquid cooling device by control device]
FIG. 5 is a flowchart showing a control process of the liquid cooling device 4 by the control device 6.
When the power of the projector 1 is turned on, the CPU configuring the control device 6 executes the control process of the liquid cooling device 4 shown below in accordance with the control program stored in the storage unit 63.
In this control process, as shown in FIG. 5, first, the low load specifying unit 61 detects the direction of gravity by the gravity sensor 5 (step S1).

And the low load specific | specification part 61 specifies a low load pumping part based on the detection result of the acquired gravity direction (step S2).
Thereafter, the drive control unit 62 drives the specified low load pumping unit for a predetermined time while stopping the operation of the other liquid pumping unit, thereby circulating the cooling liquid (step S3).
Then, after a predetermined time has elapsed since the low load pumping unit was driven, the other liquid pumping units are also driven (step S4).
In this way, the operations of the liquid pumping units 41 and 42 are controlled, and the liquid pumping units 41 and 42 circulate the coolant until the projector 1 stops.

[Identification of low load pumping section]
Here, the low load pumping unit includes, for example, a liquid pumping unit in which a reduction in suction force or feeding power is not generated by bubbles entering the inside. As such a liquid pumping unit, there is one in which the suction direction is one of a horizontal direction and a downward direction (hereinafter also referred to as a low load condition). In the liquid pumping portion where the suction direction does not satisfy the low load condition, the suction port is directed downward and the suction direction is directed upward. In the liquid pumping portion that does not satisfy the low load condition, bubbles mixed in the flow pipe 46 are likely to flow into the inside. When the amount of gas accumulated inside the liquid pumping unit exceeds a certain amount, the rotating blades idle and the suction force decreases, and as a result, the feeding power also decreases. In such a case, in order to discharge the gas accumulated inside and send out the cooling liquid, it is necessary to increase the feed power by increasing the rotation speed of the rotating blades. On the other hand, in the liquid pumping section that satisfies the low load condition, the bubbles mixed in the flow pipe 46 are difficult to flow into the inside. For this reason, the inside of the liquid pumping unit is filled with the cooling liquid, can suck and pump the cooling liquid as usual, and can be driven with a low load.

  In the present embodiment, the suction direction of the liquid pumping unit matches the flow direction of the flow path by the tubular member connected to the liquid pumping unit. Therefore, in the liquid pumping unit that does not satisfy the low load condition, the suction port is directed downward and the suction direction is directed upward. In such a liquid pumping unit, there is a possibility that the vicinity of the suction port of the flow path by the tubular member connected to the suction port is filled with gas. If the inside of the tubular member around the suction port is filled with gas, the driven liquid pumping part sucks the substrate, and the cooling liquid may not be sucked. Therefore, there is a possibility that the liquid pumping unit that does not satisfy the low load condition is a liquid pumping unit having a high load required for suction of the cooling liquid. For this reason, the low load pumping unit can be specified based on the low load condition.

The low load specifying unit 61 specifies, for example, a liquid pumping unit that satisfies the low load condition as a low load pumping unit. Further, when each of the liquid pumping units 41 and 42 satisfies the low load condition, for example, when the suction direction of each of the liquid pumping units 41 and 42 coincides with the horizontal direction, all the liquid pumping units are moved to the low load pumping. Specify as a part.
Specifically, as shown in FIG. 4, when the projector 1 is in the normal position installed on the installation surface S with the lower surface portion 22 facing downward, each liquid pumping unit 41, 42 has a low load. The condition is met. Therefore, in the normal position, both the liquid pumping units 41 and 42 are specified as the low load pumping unit.

  FIG. 6 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 installed in the reverse orientation. As shown in FIG. 6, when the projector 1 is suspended from the ceiling Ce and installed in the reverse orientation in which the upper surface portion 21 is directed downward, each liquid pumping portion 41 is similar to the above-described regular orientation. , 42 satisfy the low load condition, both of the liquid pumping units 41, 42 are specified as the low load pumping unit, as in the case of the normal posture.

  FIG. 7 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 installed in the upward projection posture. As shown in FIG. 7, in the case of the upward projection posture installed on the installation surface S with the front portion 23 facing upward, the first liquid pumping unit 41 has the suction direction D <b> 1 facing downward, and the low load condition Meet. On the other hand, the second liquid pumping unit 42 does not satisfy the low load condition. Therefore, the first liquid pumping unit 41 is specified as the low load pumping unit.

  FIG. 8 is a schematic diagram showing an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 installed in the downward projection posture. As shown in FIG. 8, in the case of the downward projection posture suspended from the ceiling Ce with the front portion 23 facing downward, the vertical relationship between the liquid pumping units 41 and 42 in the vertical direction is the above-described upward projection posture. It is reversed. Therefore, the second liquid pumping unit 42 satisfies the low load condition and is identified as the low load pumping unit.

  9 shows the arrangement of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 installed in a horizontal posture (hereinafter also referred to as a first horizontal posture) with the right side facing downward. It is a schematic diagram which shows a state. FIG. 10 shows the arrangement of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 installed in a horizontal posture with the left side faced downward (hereinafter also referred to as a second horizontal posture). It is a schematic diagram which shows an attitude | position. As shown in FIGS. 9 and 10, the liquid pumping units 41 and 42 satisfy the low load condition in any horizontal orientation. Therefore, both the liquid pumping units 41 and 42 are specified as the low load pumping unit.

Moreover, the projection direction of the projector 1 may be inclined with respect to the vertical direction or the horizontal direction with respect to each of the normal placement posture, the reverse placement posture, the upper projection posture, the lower projection posture, and each horizontal posture.
For example, FIG. 11 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 tilted with respect to the normal position so that the projection direction is directed upward. In the installation posture illustrated in FIG. 11, the first liquid pumping unit 41 has the suction direction D <b> 1 facing downward and satisfies the low load condition. Therefore, the first liquid pumping unit 41 is specified as the low load pumping unit.

  FIG. 12 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 tilted with respect to the reverse orientation so that the projection direction is directed downward. In the installation posture shown in FIG. 12, the suction direction D3 of the second liquid pumping unit 42 is directed downward and satisfies the low load condition. Therefore, the second liquid pumping unit 42 is specified as the low load pumping unit.

FIG. 13 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 tilted with respect to the first horizontal orientation so that the projection direction is directed upward from the horizontal direction. It is. FIG. 14 is a schematic diagram illustrating an arrangement state of the first liquid pumping unit 41 and the second liquid pumping unit 42 in the projector 1 tilted with respect to the second horizontal orientation so that the projection direction is directed upward from the horizontal direction. FIG. In the installation postures shown in FIGS. 13 and 14, the first liquid pumping unit 41 has the suction direction D <b> 1 downward and satisfies the low load condition. Therefore, the first liquid pumping unit 41 is specified as the low load pumping unit.
As described above, at least one of the liquid pumping units 41 and 42 is specified as the low load pumping unit in accordance with the detected installation posture of the projector 1.

The projector 1 according to the present embodiment described above has the following effects.
The projector 1 includes two liquid pumping units, specifies a low-load pumping unit from these two liquid pumping units, and drives the liquid pumping units 41 and 42 based on the specified result. Here, these liquid pumping parts 41 and 42 are arranged so that the suction directions D1 and D3 are opposite to each other (facing the opposite side). For this reason, in any one of the liquid pumping units 41 and 42, the suction direction becomes the horizontal direction or the downward direction regardless of the installation posture of the projector 1, and satisfies the low load condition. In the liquid pumping section that satisfies such a low load condition, even if bubbles are mixed in the flow path of the cooling liquid, the bubbles can be prevented from flowing into the interior together with the cooling liquid from the suction port of the liquid pumping section. Therefore, in the projector 1, at least one of the liquid pumping units 41 and 42 can be the low load pumping unit. The projector 1 can appropriately circulate the cooling liquid regardless of the installation posture by driving the liquid pumping unit, and can maintain the cooling performance.

The flow pipe 46 is connected to the suction port 41A of the first liquid pumping unit 41, and the flow direction of the flow path C1 is the first tubular member 46A along the suction direction D1, and the suction port 42A of the second liquid pumping unit 42. And a flow direction of the flow path C2 includes a fourth tubular member 46D along the suction direction D3. In such a configuration, when the first liquid pumping unit 41 satisfies the low load condition, the first liquid pumping unit 41 causes the cooling liquid to flow horizontally or downward in the flow path C1 of the first tubular member 46A. The cooling liquid will be sucked so as to move. Similarly, when the second liquid pumping section 42 satisfies the low load condition, the second liquid pumping section 42 moves the cooling liquid in the horizontal direction or in the downward direction in the flow path C2 of the fourth tubular member 46D. As a result, the cooling liquid is sucked. For this reason, the liquid pumping unit that satisfies the low load condition specified as the low load pumping unit does not need to suck the cooling liquid against gravity. Therefore, the load required for suction of the low load pumping unit can be reduced as compared with the liquid pumping unit that does not satisfy the low load condition of sucking the cooling liquid against gravity.
In this embodiment, at least one of the liquid pumping units 41 and 42 satisfies the low load condition regardless of the installation posture. For this reason, in the liquid pumping part that satisfies the low load condition, as described above, the vicinity of the suction port of the flow path by the tubular member connected to the suction port is not filled with the gas, but is filled with the cooling liquid. And can be easy. Therefore, the liquid pumping unit that satisfies the low load condition with respect to the installation posture is identified and driven as a low load pumping unit, whereby the driven liquid pumping unit sucks the gas and cannot suck the cooling liquid. Generation | occurrence | production can be suppressed and a cooling liquid can be circulated appropriately.

The first liquid pumping section 41 is connected to the first tank 43 via the first tubular member 46A, and the second liquid pumping section 42 is connected to the second tank 44 via the fourth tubular member 46D.
In such a configuration, bubbles that may flow into the liquid pumping units 41 and 42 by the tanks arranged upstream of the liquid pumping units 41 and 42 in the flow path C of the cooling liquid. And the inflow of bubbles to the liquid pumping portions 41 and 42 can be suppressed.

Further, the projector 1 acquires the installation postures of the liquid pumping units 41 and 42 based on the detection result of the acceleration in the three directions by the gravity sensor 5. Then, based on the installation posture, the low load pumping unit is specified, and the low load liquid pumping unit is driven. Then, after the predetermined time, the other liquid pumping unit is driven.
For example, the projector 1 specifies a liquid pumping unit that satisfies the low load condition as a low load pumping unit. Then, the cooling liquid is driven by the low load pumping unit to circulate the cooling liquid, and then the other liquid pumping unit driven at a higher load is driven.
Thereby, the liquid pumping part which can send out the cooling liquid with a low load can be driven more reliably, and the cooling liquid can be circulated more reliably. In addition, by driving after the cooling liquid is circulated without first driving the liquid pumping section that needs to be driven with a high load, the consumption due to driving the liquid pumping section that needs to be driven with a high load. Electric power can be suppressed.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1 described above. Here, in the projector 1, the low load pumping unit is specified based on the detection result by the gravity sensor. On the other hand, the projector according to the present embodiment specifies the low load pumping unit based on the operation state of each of the liquid pumping units 41 and 42. In this respect, the projector according to the present embodiment is different from the projector 1 described above. In the following description, description of parts that are the same as or substantially the same as those already described is omitted.

FIG. 15 is a block diagram illustrating a configuration of the projector 1A according to the present embodiment.
The projector 1 </ b> A according to the present embodiment includes a liquid cooling device 4 </ b> A, and the liquid cooling device 4 </ b> A has the same configuration and function as the projector 1 except that it includes a current detection unit 5 </ b> A instead of the gravity sensor 5.
The current detection unit 5A includes a first current detection unit 5A1 and a second current detection unit 5A2, and outputs a current value detected by each of them to the control device 6. Among these, the first current detector 5A1 detects a current value (corresponding to the drive current value of the present invention) during driving of the first liquid pumping unit 41, and the second current detector 5A2 The current value when the unit 42 is driven is detected.

[Control of liquid cooling device by control device]
FIG. 16 is a flowchart showing a control process of the liquid cooling device 4A by the control device 6 in the present embodiment.
Similar to the projector 1, when the power of the projector 1 is turned on, the CPU configuring the control device 6 performs the following control process of the liquid cooling device 4 </ b> A according to the control program stored in the storage unit 63. Run.
In this control process, as shown in FIG. 16, first, the drive control unit 62 drives all the liquid pumping units (the first liquid pumping unit 41 and the second liquid pumping unit 42) (step SA1).
Thereafter, the low load specifying unit 61 detects the drive current values indicating the respective drive states of the first liquid pumping unit 41 and the second liquid pumping unit 42 from the current detection unit 5A, whereby each liquid pumping unit 41, 42 is detected (step SA2).

Next, the low load specifying unit 61 specifies the low load pumping unit from the liquid pumping units 41 and 42 based on the acquired drive current value (step SA3).
Here, the drive current value of the liquid pumping unit (high load pumping unit) having a high load is larger than the drive current value of the low load pumping unit. For this reason, the low load specifying unit 61 compares the current values acquired from the current detection units 5A1 and 5A2, and the liquid pumping unit having a small current value corresponds to the first liquid pumping unit 41 and the second liquid pumping unit 42. One of them can be grasped, and thereby the low load pumping unit can be specified.
Thereafter, the drive control unit 62 drives the low load pumping unit for a predetermined time with the other liquid pumping units stopped (step SA4), and circulates the coolant.
Then, after a predetermined time has elapsed since the low load pumping unit was driven, the drive control unit 62 drives another liquid pumping unit (step SA5). Thereby, all the liquid pumping parts 41 and 42 are driven.
In this way, the operations of the liquid pumping units 41 and 42 are controlled, and the liquid pumping units 41 and 42 circulate the coolant until the projector 1 stops.

The projector according to the present embodiment described above has the following effects.
Since the low load specifying unit 61 specifies the low load pumping unit based on the drive current values of the liquid pumping units 41 and 42, it is possible to reliably specify the liquid pumping unit that can be driven with a low load. According to this, as in the case of the projector 1, the low load pumping unit can be reliably driven by the drive control unit 62, so that the liquid pumping unit that is difficult to suck and feed the cooling liquid due to air bubbles mixed in or loaded. Even in the presence of the cooling liquid, the cooling liquid can be reliably circulated by the low load pumping unit. This also allows the cooling liquid to flow into the other liquid pumping section, so that the load on the other liquid pumping section can be reduced, and the suction and delivery of the cooling liquid at the initial operation by the other liquid pumping section can be assisted. Accordingly, the cooling liquid can be reliably circulated by the liquid pumping units 41 and 42 and the load can be reduced, so that the power consumption can be reduced.

[Modification of Second Embodiment]
In the projector 1A of the second embodiment, the low load specifying unit 61 specifies the low load pumping unit based on the drive current values of the liquid pumping units 41 and 42 acquired from the current detecting unit 5A. However, the present invention is not limited to this. For example, when the liquid pumping units 41 and 42 are driven (at the time of initial movement), vibrations and sounds generated in the liquid pumping units 41 and 42 are quantitatively detected, and the low load pumping unit is identified based on the detection result. May be.

FIG. 17 is a block diagram illustrating a configuration of a projector 1B that is a modification of the projector 1A.
The projector 1B includes a liquid cooling device 4B, and the liquid cooling device 4B has the same configuration and function as the projector 1A except that the liquid detection device 4B includes an acceleration detection unit 5B instead of the current detection unit 5A.
The acceleration detection unit 5B includes a first acceleration detection unit 5B1 and a second acceleration detection unit 5B2. The first acceleration detector 5B1 detects the acceleration of the first liquid pumping unit 41, and the second acceleration detector 5B2 detects the acceleration of the second liquid pumping unit 42. And each detection part 5B1, 5B2 outputs the detected acceleration to the said control apparatus 6. FIG.

Here, since the vibration of the high load pumping unit is large, the acceleration of the liquid pumping unit is large. Conversely, since the vibration of the low load pumping part is small, the acceleration of the liquid pumping part is small. Thus, the load state of the liquid pumping unit can be grasped using the acceleration of the liquid pumping unit detected by the acceleration detecting unit 5B as an index.
Therefore, the low load specifying unit 61 of the projector 1B acquires the detection results of the first acceleration detection unit 5B1 and the second acceleration detection unit 5B2 in step SA2, and based on the detection result in step SA3. To identify the low-load pumping unit.
As a result, the projector 1B can achieve the same effects as the projector 1A.

FIG. 18 is a block diagram illustrating a configuration of a projector 1C that is a modification of the projector 1A.
On the other hand, the projector 1C includes a liquid cooling device 4C, and the liquid cooling device 4C has the same configuration and function as the projector 1A, except that the current detection unit 5A includes a noise detection unit 5C.
The noise detection unit 5C includes a first noise detection unit 5C1 and a second noise detection unit 5C2. The first noise detection unit 5C1 detects the noise of the first liquid pumping unit 41, and the second noise detection unit 5C2 detects the noise of the second liquid pumping unit 42. And each detection part 5B1, 5B2 outputs the detected acceleration to the said control apparatus 6. FIG.

Here, the noise is increased in the high load pumping unit, and the noise is decreased in the low load pumping unit. Thus, the load state of the liquid pumping unit can be grasped using the noise of the liquid pumping unit detected by the noise detecting unit 5C as an index.
Therefore, the low load specifying unit 61 of the projector 1C acquires the detection results of the first noise detection unit 5C1 and the second noise detection unit 5C2 in step SA2, and based on the detection result in step SA3. To identify the low-load pumping unit.
Thus, the projector 1C can achieve the same effect as the projector 1A.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1A. Here, in the projector 1A, a period in which only the specified low load pumping unit is driven and the other liquid pumping units are stopped in step SA4 is provided. On the other hand, in the projector according to the present embodiment, the sending output of the low load pumping unit is made higher than that in the normal operation without providing the period. In this respect, the projector according to the present embodiment is different from the projector 1A. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 19 is a flowchart showing a control process of the liquid cooling device 4A executed by the projector according to the present embodiment.
The projector according to the present embodiment has the same configuration as that of the projector 1A except that the control contents of the liquid pumping units 41 and 42 by the drive control unit 62 are different.
In the present embodiment, as shown in FIG. 19, after the low load specifying unit 61 specifies the low load pumping unit through the steps SA <b> 1 to SA <b> 3, the drive control unit 62 performs cooling liquid for the low load pumping unit. Is increased (step S16). Specifically, the drive control unit 62 operates the liquid pumping unit identified as the low load pumping unit so that the power output is higher than that when the low load pumping unit is not identified. For example, the drive control unit 62 sets the voltage applied to the liquid pumping unit identified as the low load pumping unit to be higher than the voltage applied when not identified as the low load pumping unit.

  According to such a projector according to the present embodiment, the cooling liquid can be reliably circulated similarly to the projector 1A. In addition, since the load of the other liquid pumping unit (the liquid pumping unit not specified as the low load pumping unit) can be reduced, the power consumption can be reduced.

[Modification]
The present invention is not limited to the above-described embodiments, and the above-described embodiments may be appropriately combined, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the embodiments described above, the liquid pumping units 41 and 42 are arranged such that the suction ports are in opposite directions, but the present invention is not limited to this. That is, the suction directions of the liquid pumping portions 41 and 42 when viewed from a predetermined direction may not be opposite to each other.

FIG. 20 is a schematic diagram illustrating another arrangement state of the liquid pumping units 41 and 42 in the projector 1D, which is a modification of the projector 1.
For example, in the projector 1D having the same configuration as the projector 1, as shown in FIG. 20, the liquid pumping units 41 and 42 have their suction ports facing each other, their suction directions are parallel, and opposite directions. It is arranged to face. Even in such an arrangement state, regardless of the installation posture, the suction direction of one of the liquid pumping units 41 and 42 is the horizontal direction or the direction toward the lower side.

  In each of the above-described embodiments, regardless of the installation posture of the projector, the suction direction of one of the liquid pumping units 41 and 42 is one of the horizontal direction and the downward direction. Although described, it is not limited to this. That is, in a projector whose usable installation posture is limited in advance, the suction direction of any of the plurality of liquid pumping units is any of the horizontal direction and the downward direction with respect to the usable installation posture. A plurality of liquid pumping units may be arranged so as to be in such a direction.

FIG. 21 is a schematic diagram showing another arrangement state of the liquid pumping units 41 and 42 in the projector 1E, which is a modification of the projector 1. As shown in FIG.
For example, in the projector 1E having the same configuration as the projector 1, as shown in FIG. 21, the liquid pumping units 41 and 42 are arranged so that the suction directions D1 and D3 of the liquid pumping units 41 and 42 are orthogonal to each other. ing.
In the example of FIG. 21, the first liquid pumping unit 41 is arranged such that the suction port 41A and the delivery port 41B are on the XZ plane, and the suction direction D1 is opposite to the Z direction. The second liquid pumping unit 42 is arranged such that the suction port 42A and the delivery port 42B are on the ZX plane, and the suction direction D3 is opposite to the X direction. In such an arrangement, in a predetermined installation posture other than the installation posture in which the projector 1E tilts the front surface portion 23 and the left side surface portion 26 downward in the vertical direction, any one of the liquid pumping portions 41 and 42 is in the low load condition. The cooling liquid can be circulated appropriately. Thus, in the case of the projector 1E designed to be usable in a predetermined installation posture other than the installation posture in which the front surface portion 23 and the left side surface portion 26 are inclined downward in the vertical direction, as shown in FIG. Even if the liquid pumping units 41 and 42 are arranged, it is possible to appropriately circulate the cooling liquid with respect to an arbitrary installation posture.
As described above, with respect to the predetermined installation posture that the projector can take, the plurality of liquid pumping units are arranged so that the suction direction of any of the plurality of liquid pumping units is the horizontal direction or the direction toward the lower side. What is necessary is just to arrange.

In each of the above-described embodiments, the two liquid pumping units 41 and 42 are provided. However, the present invention is not limited to this, and may be configured to include three or more liquid pumping units. In this case, the order of the magnitudes of the loads of the plurality of liquid pumping units may be specified, and the liquid pumping units having a small load may be sequentially driven.
Moreover, in each said embodiment, although each liquid pumping part 41 and 42 was set as the structure connected to the tanks 43 and 44 via the flow pipe 46, this invention is not limited to this, A liquid pumping part, a tank It is good also as a structure which provides members other than tubular members, such as the heat exchange unit 45, between. As described above, since the bubbles are removed by the tank before the liquid pumping unit, no member other than the tubular member such as the heat exchange unit 45 is provided between the liquid pumping unit and the tank. It is possible to make it difficult for bubbles to flow into the liquid pumping unit.

  In each of the above embodiments, the liquid cooling devices 4, 4 </ b> A, 4 </ b> B, 4 </ b> C are provided for the first tank 43 positioned upstream of the cooling liquid flow path with respect to the first liquid pumping unit 41 and the second liquid pumping unit 42. And a second tank 44 positioned upstream of the flow path of the cooling liquid. However, the present invention is not limited to this. That is, the number of tanks for storing the cooling liquid may be one in the liquid cooling device, or a plurality of tanks may be provided according to the liquid pressure feeding unit.

In the above embodiments, the arrangement order of the members 41 to 45 constituting the liquid cooling devices 4, 4 </ b> A, 4 </ b> B, 4 </ b> C is not limited to the order described in the above embodiments, and may be arranged in other orders. It doesn't matter.
In each of the embodiments described above, the projectors 1 and 1A to 1C are configured to include the three liquid crystal panels 341 as light modulation devices, but the present invention is not limited to this. That is, the present invention can also be applied to a projector including two or less or four or more liquid crystal panels as a light modulation device.
In each of the embodiments described above, the optical unit 3 has the configuration shown in FIG. 1, but is not limited thereto, and for example, a configuration having a substantially L shape in plan view or a substantially U shape in plan view is adopted. May be.

  In the above-described embodiment, the light modulation device having the transmissive liquid crystal panel in which the light incident surface and the light emitting surface are different is employed. However, the present invention is not limited to this, and a reflective light modulation device having a reflective liquid crystal panel in which the light incident surface and the light emitting surface are the same may be employed. In addition, as long as the light modulation device can modulate an incident light beam and form an image according to image information, a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like can be used. A light modulation device may be used.

  1, 1A, 1B, 1C, 1D, 1E ... projector, 4, 4A, 4B, 4C ... liquid cooling device, 6 ... control device, 41 ... first liquid pumping unit, 41A ... suction port, 41B ... delivery port, 42 ... 2nd liquid pumping part, 42A ... Suction port, 42B ... Delivery port, 43 ... 1st tank, 44 ... 2nd tank, 46 ... Flow pipe, 46A ... 1st tubular member, 46D ... 4th tubular member, 61 ... Low load specifying part, 62 ... drive control part, C, C1, C2 ... flow path, D1, D3 ... suction direction.

Claims (8)

A plurality of liquid pumping units having a suction port for sucking the cooling liquid and a delivery port for delivering the cooling liquid;
The cooling liquid is connected to the suction port and the delivery port of each of the plurality of liquid pumping units, and the cooling liquid is circulated between the plurality of liquid pumping units in the process of passing the cooling liquid as a cooling target. A liquid distribution pipe leading;
With
The plurality of liquid pumping units have a first direction that is one of a horizontal direction and a direction that faces downward with respect to the horizontal direction, and a direction that faces upward with respect to the horizontal direction and the horizontal direction. When any one of the second directions is used, the first liquid pumping unit that sucks the cooling liquid in the first direction in a predetermined installation posture, and the cooling liquid is sucked in the second direction in the predetermined installation posture. Second to
A liquid pumping unit ,
The projector characterized in that the first direction and the second direction are opposite to each other.
-. The projector according to claim 1 .
The liquid circulation pipe is
A first connection part connected to the suction port of the first liquid pumping part;
A second connection part connected to the suction port of the second liquid pumping part,
The flow direction of the cooling liquid in the first connection portion in the predetermined installation posture is the first direction.
Along the direction,
The flow direction of the cooling liquid in the second connection portion in the predetermined installation posture is the second direction.
A projector characterized by being along a direction. The projector according to claim 2 ,
A plurality of tanks for storing the cooling liquid;
The projector is characterized in that the plurality of tanks are arranged upstream of the plurality of liquid pumping units in the flow path of the cooling liquid in the liquid circulation pipe. The projector according to any one of claims 1 to 3 ,
Among the plurality of liquid pumping units, a low load specifying unit that specifies a low load pumping unit that is a liquid pumping unit whose load when sucking the cooling liquid is lower than other liquid pumping units;
A projector comprising: a drive control unit that drives the low load pumping unit specified by the low load specifying unit and then drives the other liquid pumping unit. The projector according to any one of claims 1 to 3 ,
Among the plurality of liquid pumping units, a low load specifying unit that specifies a low load pumping unit that is a liquid pumping unit whose load when sucking the cooling liquid is lower than other liquid pumping units;
The output of the cooling liquid by the low load pumping part specified by the low load specifying part,
And a drive control unit that drives the plurality of liquid pumping units by increasing the output of the cooling liquid from the other liquid pumping unit. The projector according to claim 4 or 5 ,
The low-load specifying unit specifies the low-load pumping unit based on operating states of the plurality of liquid pumping units operated by the drive control unit. The projector according to claim 6 ,
The low load specifying unit specifies the low load pumping unit based on at least one of a drive current value, an acceleration, and a noise value of each of the plurality of liquid pumping units. The projector according to claim 4 or 5 ,
The low-load specifying unit specifies the low-load pumping unit based on an installation posture of the projector.

Images