JP2008078671A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein the application of the liquid-cooled system to such electronic devices as operated in different operating positions in each of users are performed in a quite different mode, because it is mounted with restricted conditions so that air is not contained in a circulation at a reserve tank where retained air layer is formed internally, when the liquid-cooled system is provided for the cooling system in the electronic devices. <P>SOLUTION: A cross-linkage 20a is provided as a water passage forming portion so that a water passage for a coolant circulation passes through the center inside a reserve tank 5e, and at the center of the tank, a step 23a for air trapping is formed by decoupling the cross-linkage 20a at a narrow gap. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooling structure for an electronic device equipped with a heating element, and more particularly to a structure of a refrigerant liquid storage tank (hereinafter referred to as a “reserve tank”) in a circulation type liquid cooling system.

  In recent years, as the performance of electronic devices has increased, the amount of heat generated by components mounted on the electronic devices has been steadily increasing. As a result, the demand for device cooling technology has become more severe. In the computer field, the chip power density has increased as a result of increasing the number of transistors on the processor and raising the operation clock in order to speed up the CPU's processing power. TDP (Thermal Design Power) Even mobile applications have exceeded 30W. For this reason, there is an urgent need to establish an effective cooling technique for heat generated in the housing.

  Conventionally, in cooling electronic devices such as personal computers, a heat sink is connected to a heat generating element such as a CPU to diffuse the heat, and forced air cooling is used to exhaust the heat outside the casing. However, recently, a device cooling method using a liquid cooling technique has been studied because of its heat dissipation performance and quietness.

  FIG. 34 shows a configuration of a liquid cooling system mainly applied to a personal computer.

  The liquid cooling system 1 includes a heat receiving jacket 2a, a radiator 3a, a circulation pump 4a, and a reserve tank 5a. The heat receiving jacket 2a is connected to a heat generating element 6 such as a CPU or GPU, absorbs heat, and transports the amount of heat received through the refrigerant liquid flowing inside the jacket to the radiator 3a. The radiator 3a radiates heat by exchanging heat with the outside air in combination with natural air cooling or forced air cooling. The refrigerant liquid cooled by the radiator 3a is transported again to the heat receiving jacket 2a by the circulation pump 4a. In the circulation-type liquid cooling system constructed in this way, a reserve tank 5a is prepared in which a liquid amount necessary to compensate for the disappearance of the refrigerant due to volatilization from the constituent members (mainly the resin tube 7a) is secured. Yes.

  35 and 36 show the module structure of such a liquid cooling system. FIG. 35 shows a general-purpose liquid cooling module applied to a desktop PC or the like, and FIG. 36 shows a notebook PC or the like. It is the figure which showed the thin liquid cooling module applied. Although the components of both modules are common, the radiator shape and the like are changed according to the characteristics of the housing to be mounted.

  By the way, the following three roles are imposed on the reserve tank constituting the liquid cooling system described above. That is, 1) securing the necessary amount of refrigerant liquid within the device warranty period, 2) mitigating circulation system pressure fluctuation due to volume expansion associated with refrigerant liquid heat reception, and 3) capturing and removing bubbles generated in the circulation system.

  The resin tube that connects the components of the liquid cooling system with each other allows moisture evaporation of the refrigerant liquid through the molecular gap. For this reason, the antifreeze liquid condenses with long-term use, and the viscosity fluctuation due to the concentration change deteriorates the refrigerant circulation performance and lowers the cooling performance of the system. Therefore, in order to guarantee the operation for a certain period, it is necessary to secure a surplus liquid in anticipation of the amount of volatile water, and a reserve tank is prepared for storing the refrigerant liquid.

  Further, during operation of the apparatus, the refrigerant liquid that has absorbed heat from the high-temperature device expands in volume as the temperature rises, increasing the internal pressure of the circulation channel. At this time, it is necessary to prepare an air layer for pressure relaxation in the system in order to avoid liquid leakage from the module connecting portion. Therefore, the required air capacity is ensured by adjusting the liquid level position (the boundary line between the liquid and the air layer) in the reserve tank. Similarly, during operation of the apparatus, bubbles may be generated in the water channel due to intrusion of outside air, cavitation, liquid decomposition, and the like. If the bubbles stay in the water channel and block the flow channel, the refrigerant liquid does not circulate and there is a risk that the cooling function of the system is impaired. When bubbles in the liquid are mixed into a thin flow flowing between the rotating body and the main shaft of the circulation pump, the gap is sealed by the bubbles, and the space between the main shaft and the rotating body becomes a semi-dry lubrication or solid lubrication state. It will be damaged by sudden wear and heat, and the pump life will be reduced. Furthermore, if the bubbles are stagnated and the entire rotating body is immersed in the air layer, the pump itself cannot be pumped and the refrigerant liquid may not be circulated. Therefore, bubbles existing in the system are opened to the pressure buffering air layer in the reserve tank.

  As examples of applying such a liquid cooling system, configurations described in Patent Documents 1 to 5 and the like are known. FIG. 37 shows a conventional example disclosed in Patent Document 4. A heat receiving jacket 2d is mounted on the main body side of the notebook personal computer 10 to cool the CPU 11, and a thin radiator including a heat radiating pipe 13 and a metal heat radiating plate 14 is mounted on the display case 12 to exhaust heat.

At this time, the reserve tank 5d for storing the refrigerant liquid is fixed to the radiator side, maintains the necessary liquid amount within the guarantee period and removes bubbles generated in the circulation system, and helps the normal operation of the circulation pump.
JP-A-6-266474 JP 2002-366260 JP2003-022148 JP2003-209210 JP2004-047842 JP2003-304086 JP2004-84958 JP2003-78271

  When such a liquid cooling system is adopted as a cooling means for an electronic device whose installation posture differs for each user, a situation occurs in which the function of the reserve tank described above does not work well.

  For example, in a projector device that projects an image on a screen, the projector is used while being placed on the floor as shown in FIG. 38 (a), and installed on the ceiling upside down as shown in FIG. 38 (b). There is a case. Also, depending on the conditions, it is assumed that the device is projected upright and projected with right angle reflection.

  However, the conventional liquid cooling system is designed on the assumption that the operation posture is unique. In addition, as shown in the disclosure example of FIG. 37 (b), the reserve tank also has a structure in which an inflow port and an outflow port are provided in a sealed case and an appropriate amount of the refrigerant liquid 24a is filled therein. It does not have a structure corresponding to the attitude (a structure in which the reserve tank can be installed 360 degrees freely).

  In the reserve tank having such a conventional structure, there is a risk that the air layer in the tank easily shuts off the water channel inlet / outlet and hinders the circulation of the refrigerant liquid due to the change in the posture of the apparatus, thereby remarkably impairing the cooling performance. In particular, in the reserve tanks of Patent Documents 6 and 7, only the open end face in the tank of the outflow pipe is located in the center of the tank, and the open end face in the tank of the inflow pipe is greatly separated from the open end face in the tank of the outflow pipe. Is set. In this structure, if the posture changes within a specific range (0 to 90 degrees), the air layer in the tank functions without interfering with the opening end face in the tank of the inflow pipe, but the posture changes from 0 to 360 degrees. Can not cope with.

  As an example of the configuration of the reserve tank that can cope with a posture change from 0 degrees to 360 degrees, there is an invention described in Patent Document 8. However, according to the present invention, the opening end of the inflow pipe and the opening end of the outflow pipe are arranged in parallel in the same direction at the center of the tank. In such a configuration, since the open ends of the inflow pipe and the outflow pipe are exposed, there is a high probability that the retained air in the reserve tank will re-flow into the pipe channel when the tank posture is changed. In other words, even if air bubbles in the water channel are captured and stored in the air layer in the tank, when the posture is changed, the air bubbles may flow back into the water channel, causing bubbles such as clogging of the water channel and damage to the pump. high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a reserve tank that is compatible with all orientations in an electronic device cooling apparatus using a liquid cooling system and has a structure that prevents stagnant air from flowing again into a water channel when the orientation changes. .

  In order to achieve the above object, one aspect of the present invention includes a tank having a liquid refrigerant stored therein and an air layer, a heat receiving means for receiving heat by contacting the heat generating component, and heat absorbed by the refrigerant liquid. In a cooling device having a heat radiating means for radiating heat and a circulation mechanism for circulating the refrigerant liquid from the heat receiving member to the heat receiving member again through the tank and the heat radiating means, the tank includes a main body tank portion having a side surface and a tank cover. The tank has a water passage forming portion for forming a coolant circulation water passage from one side surface of the main body tank portion to a side surface facing the one side surface through a central position in the tank, and a central position in the tank and the A narrow gap that divides the water channel forming portion in the vicinity, and an opening portion of the coolant liquid circulation water channel that faces each other on the divided cross section of the water channel forming portion that is separated from the narrow gap, and has a water channel shape. On the side facing the tank cover, there is a groove for moving the staying air between the narrow gap and the one side surface, and between the narrow gap and the side surface facing the one side surface, Furthermore, the portion of the water channel forming portion opposite to the groove is in contact with the main body tank portion over the entire length. Further, according to another aspect of the present invention, the tank includes a first main body tank portion having a side surface and a second main body tank portion having a side surface, and the tank includes a first main body tank portion. Forms a first water channel forming part that forms a coolant liquid circulation channel extending from one side surface to the vicinity of the center position in the tank, and a coolant liquid circulation channel extending from one side surface of the second main body tank unit to the vicinity of the center position in the tank. A second water channel forming part, a narrow gap that divides the first water channel forming part and the second water channel forming part at and near the center position in the tank, and a first water channel forming part that separates the narrow gap An opening of the coolant liquid circulation water channel facing each other to the cross section of the second water channel forming part and the second water channel forming part, the split surfaces of the first water channel forming part and the second water channel forming part, and the second The first tank surrounded by the tank section And a second gap surrounded by the second water channel forming portion and the divided cross section of the first water channel forming portion and the first main body tank portion, and the first water channel forming portion Is in contact with the first main body tank part over the entire length, and the second water channel forming part is in contact with the second main body tank part over the entire length.

  In such a configuration, the coolant liquid circulation channel is formed so as to pass through the center position in the tank, and the channel is opened at the tank center position. For this reason, even if the air layer in the tank prepared for pressure relaxation changes the staying position in accordance with the change in the apparatus posture, the staying air is divided by a narrow gap in the center of the tank, and the refrigerant is formed. Do not enter the opening of the water circulation channel. Furthermore, when the tank posture changes, it is also a mechanism that efficiently removes microbubbles generated in the water channel by a narrow gap formed by dividing the water channel forming part at the tank center position. Therefore, stable refrigerant circulation can be ensured in any posture.

  In particular, since the openings of the refrigerant liquid circulation channel formed by being divided by a narrow gap face each other at the center position of the tank and are hidden from the outside, the stagnant air in the tank is changed when the tank posture changes. The probability of re-inflow into the pipe channel is low. This is superior to the invention described in Patent Document 8.

  By using the cooling device of the present invention, there is no restriction on the mounting direction of the liquid cooling system, so it is possible to apply the liquid cooling technology to electronic devices that assume various installation postures such as projector devices. Become.

  Below, the reserve tank structure of the cooling device by this invention is demonstrated in detail, referring drawings.

(First embodiment)
1 to 5 show a reserve tank structure of a cooling device according to a first embodiment of the present invention. FIG. 1 is an overall view thereof, FIG. 2 is an internal configuration diagram thereof, FIG. 3 is a front view thereof, and FIG. FIG. 5 is a perspective sectional view, and FIG.

  FIGS. 6 to 8 are operation diagrams showing the behavior of the staying air layer and the trapping action of air bubbles mixed in the water channel in each installation posture of the reserve tank structure of the cooling device according to the first embodiment of the present invention.

  1 to 5, the cooling device 15a of this embodiment includes a heat receiving jacket 2e, a radiator 3d, a heat radiating fan 16c, a circulation pump 4e, and a reserve tank 5e. Among these, as shown in FIG. 1, the reserve tank 5e is connected in the middle of the path of the resin tube 7d that connects the components of the cooling device 15a, and is an air layer that buffers the storage of the refrigerant liquid and the thermal expansion of the refrigerant liquid. Retention and trapping of air bubbles generated in the circulation system (air trap) are performed.

  FIG. 2 shows the internal configuration of the reserve tank 5e. The reserve tank 5e is configured by joining two members, a main body tank portion 18a and a tank cover 17a. In some cases, a tube joint 19a prepared as a separate member is airtightly connected to the main body tank portion 18a. .

  As shown in FIGS. 2 and 3, a bridging portion 20 a is integrally formed with the main body tank portion 18 a on the main axis of the reserve tank that connects the inlet portion and the outlet portion of the refrigerant liquid. . As shown in FIG. 4, a through hole is provided in the bridging portion 20 a as the coolant liquid circulation water channel 21 a. Further, a narrow gap 22a (see FIG. 3) is set at the central position of the main body tank of the bridging portion 20a, which is a water channel forming portion, and the refrigerant liquid circulation channel 21a is divided to form a fault section 23a for air trapping in the bridging portion 20a. Is forming.

  As shown in FIG. 5, an appropriate amount of the refrigerant liquid 24 is filled in the reserve tank having such a configuration, and the inflow end and the outflow end of the resin tube 7d are connected to the tube joint 19a to circulate a liquid cooling system. Is building. At this time, the amount of the refrigerant liquid filled in the reserve tank is adjusted so that a fixed volume of the staying air layer 25a (see FIG. 5) is secured in the upper layer portion of the tank. By securing this stagnant air layer 25a, volume fluctuations due to thermal expansion of the refrigerant liquid are received by the stagnant air layer 25a to alleviate the increase in the internal pressure of the circulation system, avoiding the leak of the refrigerant liquid, and guaranteeing the device reliability. It is supposed to be.

  Here, the capacity design of the stagnant air layer 25a depends on the wetting edge area of the resin tube 7d constituting the cooling device 15a, the total amount of the refrigerant liquid, and the pressure resistance design of the system, and each has a correlation. That is, the total amount of refrigerant liquid depends on the circulation path length of the system, and the circulation path length affects the wetting edge area of the resin tube, and the resin tube wetting edge area affects the refrigerant volatilization disappearance amount. It is determined based on the balance between the design parameters and the warranty period of the electronic device to be mounted. At this time, since the volume change amount in the thermal expansion at the endothermic time is determined according to the amount of refrigerant liquid prepared, the necessary staying air volume is determined so as to be within the circulation system pressure resistance design range of the liquid cooling system. However, if the staying air volume is ½ or more of the tank internal volume, the staying air that moves when the tank posture changes is still in the waterway opening, even if the opening of the refrigerant liquid circulation channel pipe is arranged in the center of the tank. It will interfere with the part. Therefore, the staying air volume is preferably 1/3 or less of the tank internal volume.

  As shown in FIGS. 2 to 4, a cutting groove 26a is provided before and after the air trapping fault portion 23a in the bridging portion 20a of the reserve tank 5e to secure a space for staying air movement. Specifically, when the top and bottom of the reserve tank 5e changes with the change in the installation posture of the electronic device to be mounted, the air tank 25a is set to pass through the space of the cutting groove 26a when moving the staying position of the air layer 25a. The backflow of the moving air from the fault section 23a to the coolant circulation water channel 21a is avoided.

  FIG. 6 to FIG. 8 show bubble trapping operations according to the respective installation postures of the reserve tank 5e of the present embodiment described above.

  6 shows rotation around the refrigerant liquid circulation channel (X axis in FIG. 6A), FIG. 7 shows around the Y axis orthogonal to the refrigerant liquid circulation channel, and FIG. 8 shows around the vertical axis (FIG. ), The appearance of the staying air layer 25a in the reserve tank corresponding to the rotation of the Z axis) is shown. 6 to 8, (c) is a state in which the state of FIG. (B) is rotated by 90 ° in the direction of the arrow, and (d) is a state in which the state of FIG. (C) is further rotated by 90 °. State. In addition, a state is shown in which minute bubbles 43 in the circulation channel are captured by the air trapping fault 23a and merge into the staying air layer 25a.

  Thus, by setting the fault part 23a of the coolant liquid circulation water channel 21 at the center of the reserve tank, the stagnant air layer 25a may interfere with the water channel opening position (air trap fault part) in the omnidirectional posture change. Therefore, the refrigerant liquid can be stably pumped without biting the air into the circulation channel. Also, the air trapping section 23a provided at this time enables the bubbles 43 generated during operation to be effectively removed from the flow path. Furthermore, by setting the air layer to be easily moved during the posture change through the space of the cutting groove 26a provided in the bridging portion 20a in the tank body, the backflow of bubbles to the water channel opening is reduced. The structure is easy to avoid.

  By providing the reserve tank having such a structure, it is possible to construct a liquid cooling system that does not require any mounting posture.

(Second Embodiment)
9 to 13 show a reserve tank structure of a cooling device according to a second embodiment of the present invention, FIG. 9 is an overall view thereof, FIG. 10 is an internal configuration view thereof, FIG. 11 is a perspective configuration sectional view thereof, FIG. 12 is a perspective sectional view, and FIG.

  The reserve tank 5f in the present embodiment facilitates the movement of the staying air through the gap in the cutting groove provided in the bridge in the tank of the reserve tank shown in the first embodiment. It is characterized by joining axially symmetric members.

  That is, as shown in FIG. 10 to FIG. 12, the bridge portion 20b including the coolant liquid circulation channels 21b and 21c is provided on the central axis of the reserve tank 5f, and is axisymmetric at the position of the air trap fault portion 23b. Such a pair of main body tank portions 18b and 18c are fitted from above and below. Further, when fitted, the cutting grooves 26b and 26c prepared in the bridging portion 20b are also arranged symmetrically. For this reason, as shown in FIG. 13, since the moving air gaps 27a and 27b for the stagnant air accompanying the change in the installation posture are also prepared symmetrically, the stagnant air layer 25b in the tank can be stably moved from any posture. Is possible.

(Third embodiment)
14 to 18 show a reserve tank structure of a cooling device according to a third embodiment of the present invention, FIG. 14 is an overall view thereof, FIG. 15 is an internal configuration diagram thereof, FIG. 16 is a top view thereof, and FIG. FIG. 18 is a perspective sectional view thereof.

  FIGS. 19 to 21 are operation diagrams showing the behavior of the staying air layer and the trapping action of air bubbles mixed in the water channel in each installation posture of the reserve tank structure of the cooling device according to the third embodiment of the present invention.

  The cooling device 15c of the present embodiment is provided with the refrigerant liquid inlet and the refrigerant liquid outlet of the reserve tank in the first embodiment on the same side, and the circulation system is compactly configured, thereby improving the mountability to electronic equipment. The purpose is to plan.

  That is, in FIG. 14 to FIG. 18, the cooling device 15c of the present embodiment is constituted by a heat receiving jacket 2e, a radiator 3d, a heat radiating fan 16c, a circulation pump 4e, and a reserve tank 5g. As shown in FIG. 14, the reserve tank 5 g has an inlet portion and an outlet portion that connect the resin tube 7 d in the same direction, and buffers the storage of the refrigerant liquid and the thermal expansion caused by the reception of the refrigerant liquid. The air layer stays and traps air bubbles generated in the circulation system (air trap).

  FIG. 15 shows the configuration of the reserve tank 5g of the present embodiment. The reserve tank 5g is constituted by joining two main body tank portions 18d and 18e having mirror symmetry and tube joints 19c and 19d. As shown in FIG. 16, the main body tank portions 18d and 18e are integrally formed with a U-shaped bridge 20c inside the tank, and a pair of upper and lower main body tank portions is prepared by preparing a water channel groove 28 on the joint surface. When 18d and 18e are joined, a U-shaped refrigerant liquid circulation channel is formed.

  Further, at the pole position of the U-shaped bridge portion 20c, as shown in FIG. 16, the water channel groove 28 is divided by the narrow gap 22b to form the air trap fault portion 23c. Further, as shown in FIG. 16 and FIG. 18, a throttle portion 29 having a channel width is provided at the opening position of the air trapping fault portion 23 c of the channel groove 28.

  FIG. 19 to FIG. 21 show bubble trapping operations according to the installation postures of the reserve tank 5g of the present embodiment.

  19 shows rotation around the refrigerant liquid circulation channel (X axis in FIG. 19A), FIG. 20 shows around the Y axis perpendicular to the refrigerant liquid circulation channel, and FIG. 21 shows the vertical axis (FIG. ), The appearance of the staying air layer 25c in the reserve tank corresponding to the rotation of the Z axis) is shown. In each of FIGS. 19 to 21, FIG. (C) is a state where the state of FIG. (B) is rotated by 90 ° in the direction of the arrow. In FIG. 19 and FIG. 20, FIG. (D) shows a state in which the state of FIG. Further, in FIG. 21, FIG. (D) shows a state where the state of FIG. (C) is further rotated by 180 °. Further, a state is shown in which minute bubbles 43 in the circulating water channel are captured by the air trapping fault portion 23c and merge into the staying air layer 25c.

  By setting the U-shaped refrigerant liquid circulation channel in the reserve tank in this way, the inlet and outlet parts of the refrigerant liquid are aligned in the same direction, so the connection of the liquid cooling system becomes compact and electronic equipment Implementation is improved.

  Furthermore, by setting the air trapping fault 23c at the pole that is the flow direction changing position of the U-shaped refrigerant liquid circulation channel, the channel opening is arranged at the center of the tank. For this reason, as in the first embodiment, the stagnant air layer 25c does not interfere with the water channel opening with respect to the omnidirectional posture change, so that stable refrigerant liquid pressure feeding is possible. In addition, by providing a restriction at the opening position (pole position) of the U-shaped water channel groove, it is difficult for the bubbles to flow back into the circulation water channel when the residual air in the tank moves when the posture changes.

(Fourth embodiment)
22 to 25 show a reserve tank structure of a cooling device according to a fourth embodiment of the present invention, FIG. 22 is an internal configuration diagram thereof, FIG. 23 is a perspective sectional view thereof, and FIG. FIG. 25 is a detailed diagram and FIG.

  The reserve tank in the present embodiment is used for improving productivity in the reserve tank shown in the first embodiment. In other words, in the first embodiment, the bridge portion integrally formed with the main body tank portion and the coolant liquid circulation channel are formed by joining different members made of one circular pipe. As shown in FIG. 22, the reserve tank 5h in the present embodiment is configured by penetrating one refrigerant liquid circulation conduit 30 on the central axis of the main body tank portion 18f and joining a tank cover 17b. As shown in FIG. 24, a through hole 34a for an air trap is provided in a cross shape in a cross shape perpendicular to the flow path at the center position of the tank of the refrigerant liquid circulation conduit 30. Here, the reason why the air trap through-holes 34a are set in the horizontal direction and the vertical direction is to make it possible to substantially correspond to installation orientations in all directions. As a result, as shown in FIG. 25, the water channel opening for the bubble trap can be set in the center of the tank, the water channel interference of the staying air layer 25d in any posture can be avoided, and the air layer moving gap can be used as the coolant liquid circulation channel. It can be prepared in the outer space of the tube 30.

(Fifth embodiment)
26 to 29 show the reserve tank structure of the cooling device according to the fifth embodiment of the present invention, FIG. 26 is its internal configuration diagram, FIG. 27 is its horizontal sectional view, FIG. 28 its vertical sectional view, FIG. FIG. 4 is an explanatory diagram of the operation of the tank.

  The reserve tank 5i in the present embodiment is used for improving workability in the reserve tank shown in the third embodiment. That is, in the third embodiment, the U-shaped bridge portion integrally formed with the main body tank portion and the U-shaped coolant liquid circulation channel are formed by connecting separate members formed by bending one circular pipe. Structure. In particular, in this embodiment, a flexible tube typified by a resin tube is employed for the circular pipe portion.

  That is, as shown in FIG. 26, two joint pipes 32a and 32b for refrigerant liquid inflow and outflow are joined in the same direction of the main body tank portion 18h, and the end faces on the main body tank side of the two joint pipes 32a and 32b. Is connected to a resinous water pipe tube 33 curved in a U shape to constitute a circulating water channel. At the pole position (flow direction changing position) corresponding to the center of the tank of the water pipe tube 33, through holes 34b for air traps as shown in FIG. 24 of the fourth embodiment are provided in the horizontal direction and the vertical direction. (See FIGS. 27 and 28).

  By using the reserve tank having such a structure, the inlet and outlet portions of the circulation system are aligned in the same direction in the reserve tank, the system can be made compact, and the mountability can be improved. Furthermore, as shown in FIG. 29, an air trap through-hole 34b is provided at the pole that is the flow direction changing position of the U-shaped channel pipe 33 to set a channel opening in the center of the tank, and at the same time, the outside of the channel pipe 33 The reserve tank corresponding to the omnidirectional posture change can be provided by allocating the space to the gap for moving the staying air layer 25e. Furthermore, by using a flexible tube for the U-shaped water channel pipe, it is possible to provide a reserve tank excellent in workability and assemblability.

(Sixth embodiment)
30A and 30B show a reserve tank structure of a cooling device according to a sixth embodiment of the present invention. FIG. 30A is an overall view, and FIG. 30B is a partially enlarged view of FIG. FIG. 31 is a plan view showing the cooling device of the present embodiment, and FIG. 32 is an operation explanatory view of the reserve tank. FIGS. 33A to 33C are side views showing various configuration examples of the reserve tank.

  30 (a) and 30 (b), the cooling device 15d of this embodiment includes a heat receiving jacket 2f, a radiator 35a, a heat radiating fan 16d, a resin tube 7e, a circulation pump 4f, and a reserve tank. Has been. The radiator 35a employs a thin structure formed by joining two thin plates formed with water circulation grooves for circulating the refrigerant. On the other hand, the reserve tank is mounted on the radiator 35a together with the circulation pump 4f and the heat radiating fan 16d to constitute a liquid cooling module.

  The cooling device in the present embodiment is characterized in that a reserve tank corresponding to an omnidirectional installation posture is provided on a thin radiator. That is, the reserve tank is configured by joining the tank cover 17c and the radiator 35a. As shown in FIG. 30B, the radiator water channel 36a extending to the tank cover joint portion of the radiator 35a is narrowed at the center position of the reserve tank and is divided by the narrow gap 22c. On the left and right radiator surfaces sandwiching the opening 38 formed by the division, a recessed space 37a is provided within a range included in the tank cover 17c (see FIG. 31). Further, in the opening 38 of the radiator water channel 36a, as shown in FIG. 30 (b), a pivot-like protrusion 39a is provided.

  Next, the operation of the reserve tank of this embodiment will be described with reference to FIGS.

  FIG. 31 is a plan view showing the cooling device in the present embodiment, and FIG. 32 shows the air trapping operation in the BB cross section of FIG. 32 (a) assumes a floor-mounted state, and FIG. 32 (b) assumes a 180 ° inverted state, and FIG. 33 (a) shows a reserve as seen from the CC cross section of FIG. The tank cross-sectional structure is shown.

  In this embodiment, the recessed space 37a is formed by counterboring the thickness direction of the radiator 35a. Thus, when the tank cover 17c is joined to the radiator 35a, the refrigerant liquid storage volume and the air retention space can be prepared on both sides of the tank cover 17c. Then, an air trap fault is constructed at the radiator water channel opening formed by the narrow gap 22c in the center of the tank, and bubbles are trapped. At this time, even if the installation posture is reversed (see FIG. 32B), the recessed air gap 37a formed on the radiator surface side holds the staying air layer 25f on the ceiling side, so that it is possible to cope with the reversed installation. Become. Further, as shown in FIG. 32 (b), the pivot-shaped protrusion 39a provided in the radiator water channel opening 38 disturbs the circulation flow and swings the mixed bubbles, so that it is provided on the left and right of the water channel opening 38. It is easy to guide to the recessed space 37a.

  Here, FIGS. 33B and 33C show another configuration example of the reserve tank of the present embodiment.

  In the reserve tank shown in FIG. 33 (b), the recess gap 37a and the protrusion 39a are formed by drawing the radiator 35a instead of the recess gap formed by counterboring as shown in FIG. 33 (a). . This configuration example is suitable when the plate thickness of the radiator is thin.

  Further, in the reserve tank shown in FIG. 33 (c), a through hole 40 is provided in the radiator 35a, and a radiator cover 44, which is a separate member, is joined from the side surface opposite to the tank cover 17e, thereby forming a recess gap 37a. This configuration example is applied when a sufficient volume of voids cannot be obtained by pressing in the configuration example of FIG.

1 is an overall view showing a reserve tank structure of a cooling device according to a first embodiment of the present invention. It is an internal block diagram of the reserve tank of FIG. It is a front view of the reserve tank of FIG. It is a perspective sectional view of the reserve tank of FIG. It is a block diagram at the time of the refrigerant | coolant liquid filling of the reserve tank of FIG. It is a figure which shows the aspect of a staying air layer when changing the attitude | position of the reserve tank of FIG. 1 to the X-axis periphery. It is a figure which shows the aspect of a stagnant air layer when changing the attitude | position of the reserve tank of FIG. 1 around the Y-axis. It is a figure which shows the aspect of a retention air layer when changing the attitude | position of the reserve tank of FIG. It is a general view which shows the reserve tank structure of the cooling device by the 2nd Embodiment of this invention. FIG. 10 is an internal configuration diagram of the reserve tank of FIG. 9. FIG. 10 is a perspective sectional view of the reserve tank of FIG. 9. FIG. 10 is a perspective sectional view of the reserve tank of FIG. 9. FIG. 10 is an operation explanatory diagram of the reserve tank of FIG. 9. It is a general view which shows the reserve tank structure of the cooling device by the 3rd Embodiment of this invention. It is an internal block diagram of the reserve tank of FIG. It is a top view of the reserve tank of FIG. It is a perspective view of the reserve tank of FIG. It is a perspective sectional view of the reserve tank of FIG. It is a figure which shows the aspect of a staying air layer when changing the attitude | position of the reserve tank of FIG. 14 to the X-axis periphery. It is a figure which shows the aspect of a staying air layer when changing the attitude | position of the reserve tank of FIG. 14 around the Y-axis. It is a figure which shows the aspect of a staying air layer when changing the attitude | position of the reserve tank of FIG. 14 around the Z-axis. It is an internal block diagram which shows the reserve tank of the cooling device by the 4th Embodiment of this invention. It is a perspective sectional view of the reserve tank of FIG. FIG. 23 is a detailed view of a water pipe in the reserve tank of FIG. 22. It is operation | movement explanatory drawing of the reserve tank of FIG. It is an internal block diagram which shows the reserve tank of the cooling device by the 5th Embodiment of this invention. FIG. 27 is a horizontal sectional view of the reserve tank of FIG. 26. FIG. 27 is a vertical sectional view of the reserve tank of FIG. 26. It is operation | movement explanatory drawing of the reserve tank of FIG. The reserve tank structure of the cooling device by the 6th Embodiment of this invention is shown, A figure (a) is a general view, A figure (b) is the elements on larger scale of figure (a). It is a top view which shows the cooling device of FIG. It is operation | movement explanatory drawing of the reserve tank of FIG. (A)-(c) is a sectional side view which shows the various structural examples of a reserve tank. It is a block diagram which shows the conventional liquid cooling system typically. It is a perspective view which shows the structure of the conventional general-purpose liquid cooling system. It is a perspective view which shows the structure of the conventional thin liquid cooling system. It is a block diagram of the electronic device carrying the liquid cooling system of patent document 4. FIG. It is a side view which shows the installation attitude | position of a projector apparatus.

Explanation of symbols

2e Heat receiving jacket 3d Radiator 4e Circulation pump 5e, 5f, 5g, 5h, 5i Reserve tank 7d Resin tube 15a, 15b, 15c Cooling device 16c Radiation fan 17a, 17b Tank cover 18a, 18b, 18c, 18d, 18e, 18f, 18h Body tank part 19a, 19b, 19c, 19d Tube joint 20a, 20b, 20c Bridge part 21a, 21b, 21c, 30 Refrigerant liquid circulation channel 22a, 22b Narrow gap 23a, 23c Fault part 24 Refrigerant liquid 25a, 25b, 25c, 25d, 25e Residual air layer 26a, 26b, 26c Cutting part 27a, 27b Moving air gap 28 Water channel groove 29 Throttle part 32a, 32b Joint pipe 33 Water pipe tube 34a, 34b Through hole 43 Bubble

Claims (4)

A tank that stores the refrigerant liquid and has an air layer, a heat receiving means that receives heat by making contact with a heat generating component, a heat radiating means that dissipates heat absorbed by the refrigerant liquid, and the refrigerant liquid from the heat receiving member In the cooling device having a circulation mechanism that circulates again to the heat receiving member through the tank and the heat radiating means,
The tank comprises a main body tank portion having a side surface and a tank cover,
In the inside of the tank, a water channel forming part that forms a coolant liquid circulation water channel from one side surface of the main body tank unit through a central position in the tank to a side surface facing the one side surface,
A narrow gap that divides the water channel forming portion at a central position in the tank and in the vicinity thereof,
An opening portion of the water channel for circulating the refrigerant liquid that faces each other in a section of the water channel forming portion across the narrow gap,
To move the stagnant air between the narrow gap and the one side surface, and between the narrow gap and the side surface facing the one side surface, on the side of the water channel forming portion facing the tank cover Having a groove,
Furthermore, the part on the opposite side to the said groove | channel of the said water channel formation part is contact | abutting over the said main body tank part over the full length, The cooling device characterized by the above-mentioned. A tank that stores the refrigerant liquid and has an air layer, a heat receiving means that receives heat by making contact with a heat generating component, a heat radiating means that dissipates heat absorbed by the refrigerant liquid, and the refrigerant liquid from the heat receiving member In the cooling device having a circulation mechanism that circulates again to the heat receiving member through the tank and the heat radiating means,
The tank comprises a first main body tank portion having a side surface and a second main body tank portion having a side surface,
Inside the tank,
A first water channel forming unit that forms a refrigerant liquid circulation channel extending from one side surface of the first main body tank unit to the vicinity of a central position in the tank;
A second water channel forming unit that forms a coolant liquid circulation channel extending from one side surface of the second main body tank unit to the vicinity of the center position in the tank;
A narrow gap that divides the first water channel forming part and the second water channel forming part at a central position in the tank and in the vicinity thereof;
An opening of the coolant-circulation water channel facing each of the dividing surface of the first water channel forming unit and the dividing surface of the second water channel forming unit across the narrow gap;
A first gap surrounded by the first water channel forming portion and the second water channel forming portion and the second main body tank portion;
A second gap surrounded by the second water channel forming part and the first water channel forming part and the first main body tank part;
The first water channel forming portion is in contact with the first main body tank portion over the entire length, and the second water channel forming portion is in contact with the second main body tank portion over the entire length. Cooling system.   The cooling device according to claim 2, wherein the first gap and the second gap have a symmetric positional relationship with respect to the narrow gap.   The cooling device according to claim 1 or 2, wherein the opening is hidden from the outside.

Images