JP2006300359A - Refrigerant liquid injection device and refrigerant liquid injection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant liquid injection device and a refrigerant liquid injection method improving cooling performance as a cooling module by ensuring air venting in injecting a refrigerant liquid into the cooling module to secure the required quantity of refrigerant liquid. <P>SOLUTION: The refrigerant liquid injection device for injecting the refrigerant liquid into the cooling module M comprises: a first connection port body 29a connected to a circulating passage 6 of the cooling module, and a second connection port body 29b connected to a reserve tank part 11; a refrigerant liquid supply mechanism K communicating with the first and second connection port bodies respectively through three-way selector valves 30A, 30B and supplying the refrigerant liquid to one of the first and second connection port bodies according to a switching direction, and a discharge mechanism H venting air from the other side and recovering the refrigerant liquid; and a support mechanism S supporting the cooling module and changing the support attitude of the cooling module according to the switching timing of the three-way selector valves. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerant liquid injection device and a refrigerant liquid injection method for injecting a refrigerant liquid into a cooling module that cools an electronic component such as a CPU using the refrigerant liquid.

In electronic device devices such as personal computers (hereinafter referred to as PCs), demands for high speed processing and large capacity are increasing year by year. Accordingly, in electronic parts such as CPUs, which are semiconductor elements used in PCs, it is expected that the heat generation temperature will continue to increase.
Currently, air cooling with a small fan dominates as a means of cooling electronic components, but this air cooling has limited heat dissipation capability, and electronic components that continue to tend to have high heat generation temperatures can be efficiently used. There is a possibility that it cannot be cooled. In view of this, a water-cooled type in which a cooling medium such as water (hereinafter referred to as “refrigerant liquid”) is circulated to cool electronic components has attracted attention.
For example, [Patent Document 1] discloses a water-cooled cooling device (hereinafter referred to as “cooling module”) that circulates a refrigerant liquid to cool a CPU and the like. [Patent Document 2] and [Patent Document 3] disclose a liquid feed pump that is optimal for use in the above-described cooling module.
JP 2003-124671 A Japanese Patent Laid-Open No. 2003-161284 JP 2003-172286 A

By the way, when the PC is used for a long period of time, the refrigerant liquid in the cooling module gradually evaporates, and eventually the effective capacity may be interrupted to affect the cooling efficiency. For this reason, a reserve tank that stores an amount of refrigerant liquid corresponding to evaporation in advance is disposed in the circulation path of the refrigerant liquid.
As part of a manufacturing apparatus for manufacturing such a cooling module, a refrigerant liquid injection apparatus that automatically injects a refrigerant liquid is used. The reserve tank constituting the cooling module is provided with one or a plurality of inlets, into which the refrigerant liquid is injected from the refrigerant liquid injection device.

When the refrigerant liquid is injected into the reserve tank, there are one or two communication holes (about φ1.5 mm) for letting air, which is a gas, from the circulation path side to the reserve tank, between the reserve tank and the circulation path. It is provided over.
When the injection of the refrigerant liquid from the refrigerant liquid injector to the inlet is actually started, the air in the circulation path and the refrigerant liquid in the reserve tank are exchanged in the communication hole. Although the refrigerant liquid is filled in the circulation path, since the exchange of the refrigerant liquid in the reserve tank and the air in the circulation path is limited to the communication hole, it is difficult to quickly and surely exchange.

If the reserve liquid is filled in the reserve tank before the air in the circulation path and the injected refrigerant liquid are replaced, the communication hole that is the outlet of the air remaining in the circulation path is blocked by the refrigerant liquid. As a result, air remains in the circulation path. If it is used as it is as a cooling module, the cooling performance is lowered due to the influence of residual air.
In addition, in order to secure the refrigerant liquid capacity necessary for the cooling module, it is possible to predict the remaining amount of air when injecting the refrigerant liquid in advance and increase the internal volume of the cooling module beyond the required internal capacity. However, as a result, the size of the cooling module is hindered.

  The present invention has been made paying attention to the above circumstances, and its object is to inject refrigerant liquid from one hole of the cooling module and simultaneously discharge air from the other hole, By reversing the direction of refrigerant injection and air discharge, and changing the attitude of the cooling module, it ensures air venting and secures the required amount of refrigerant liquid, improving the cooling performance of the cooling module. The refrigerant liquid injection device and the refrigerant liquid injection method are provided.

  To achieve the above object, the present invention provides a coolant injection device for injecting coolant into a cooling module including a liquid feed pump, a heat receiving portion, a heat radiating portion, and a reserve tank communicated via a circulation path. The first connection port connected to the circulation path of the cooling module, the second connection port connected to the reserve tank, the first connection port and the second connection port via the switching means, respectively. A coolant supply means for supplying a coolant to one of the first and second connection ports according to the switching direction, a discharge means for releasing air from the other and collecting the coolant, and a cooling module. And supporting means for changing the support posture of the cooling module in accordance with the switching timing of the switching means.

  In order to achieve the above object, the present invention provides a refrigerant liquid injection method for injecting a refrigerant liquid into a cooling module including a liquid feed pump, a heat receiving part, a heat radiating part, and a reserve tank communicated with each other through a circulation path. Refrigerant liquid is injected into the reserve tank for a predetermined time to fill the refrigerant liquid in the corners of the reserve tank and to bleed air from the circulation path, and then change the attitude of the cooling module to change the cooling module from the reserve tank to the circulation path. At the same time, the air is vented from the circulation path, and then the refrigerant liquid is injected into the circulation path and the air is vented from the reserve tank.

  According to the present invention, injection is performed in which air is surely discharged to ensure a necessary amount of refrigerant liquid, and an improvement in cooling performance as a cooling module can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view illustrating the entire configuration of the cooling module M. FIG.
In the figure, reference numeral 1 in the center is a main body, which is formed by integrally forming a heat receiving portion 2 and a reserve tank-integrated liquid feed pump (hereinafter simply referred to as “liquid feed pump”) 3 as will be described later. is there. The heat receiving portion 2 is made of a thin plate selected from a material having good heat conductivity, and is fixedly mounted on the liquid feed pump 3 via a fixture a.

Two pipes P are connected to the lower end portion of the main body 1 in the figure, and these pipes P are connected to the liquid feed pump 3 and directly attached and fixed on the base 4 extending to the left and right. At the left and right ends of the base 4, a circular heat dissipating part 5 composed of heat dissipating fins and a fan is attached. One of the pipes P is connected to the heat dissipating part 5 on the left side of the figure, and the other is connected to the heat dissipating part 5 on the right side.
The base 4 is provided with a transition pipe Pa that communicates the left and right heat radiating portions 5. The liquid feed pump 3, the heat radiating portion 5, the two pipes P communicating with the liquid feed pump 3 and the heat radiating portion 5, and the transition pipe Pa are filled with a refrigerant liquid, for example, water. A refrigerant liquid circulation path 6 is formed.

As described above, the cooling module M is configured, and in a state in which the cooling module M is incorporated in the PC, an electronic component having a large exothermic property such as a CPU is placed on the heat receiving portion 2 of the main body 1 to dissipate heat. The part 5 is disposed in the middle of the cooling air passage formed in the PC.
The liquid feed pump 3 is driven at the start of the operation as the PC or at a predetermined timing, and the refrigerant liquid circulates in the circulation path 6. On the other hand, the heat receiving part 2 absorbs the heat generated from the electronic component, the refrigerant liquid comes into contact with the heat receiving part 2, and the refrigerant liquid absorbs the heat absorbed by the heat receiving part 2 and the temperature rises. The refrigerant liquid whose temperature has risen is sent to the right and left heat radiating portions 5 through the circulation path 6 by the action of the liquid feed pump 3 to radiate heat.

The refrigerant liquid that has radiated heat at each heat radiating section 5 and has fallen in temperature is sent again to the main body section 1 through the circulation path 6 by the action of the liquid feed pump 3 and absorbs heat at the heat receiving section 2. Thereafter, the refrigerant liquid is circulated as described above to efficiently cool the electronic component.
FIG. 2 is an exploded perspective view of the main body 1, and specifically shows a state in which the heat receiving portion 2 is removed from the liquid feed pump 3.
The case 8 of the liquid feed pump 3 has a substantially rectangular shape. The case main body 12 includes a pump chamber 10 and a reserve tank portion (reserve tank) 11 therein, and covers the upper surface of the case main body 12. And a cover 2 that is attached and fixed to the peripheral end portion with a plurality of mounting screws. The cover 2 is the heat receiving part 2 itself described above, and a packing material (not shown) is interposed between the peripheral part of the heat receiving part 2 and the case body 12 to form a watertight structure.

The pump chamber 10 provided in the case main body 12 is a circular recess having a central portion provided at a position deviated from the central position of the case main body 12, and the upper opening surface is covered with the heat receiving portion 2. A disc-like impeller 13 is rotatably disposed in the pump chamber 10.
The shaft b provided at the center of the impeller 13 is supported by a bearing portion so as to be freely rotatable, and a stator portion constituting a motor is integrally provided on a peripheral surface of the bearing portion. A cylindrical portion is provided at a peripheral end portion of the impeller, and a rotor portion constituting the motor is integrally provided on an inner peripheral surface of the cylindrical portion. Accordingly, the rotor portion and the stator portion constitute an outer rotor type motor that rotationally drives the impeller.

On the other hand, the reserve tank part 11 is a space part in the case main body 12 formed in a substantially U shape around the pump chamber 10 described above. Similar to the pump chamber 10, the upper surface is opened and covered with the heat receiving part 2, whereby the reserve tank part 11 which is a space part is formed.
A flow path forming member 14 is provided between the side surface portion of the pump chamber 10 and the inner wall surface of the case main body 12, and the flow path forming member 14 exists in the reserve tank portion 11. The flow path forming member 14 is bifurcated and formed with a flow path (not shown) in each branch portion. One end of these flow paths is opened to the pump chamber 10, and the other end communicates with a suction port body 15 and a discharge port body 16 that project integrally from the side surface of the case body 12.

The suction port body 15 and the discharge port body 16 are connected to the left and right pipes P described above with reference to FIG. In addition to the connection portion of the flow path forming member 14 with the pump chamber 10, the connection portion with the side surface portion of the case body 12 has a completely watertight structure, and direct water (refrigerant liquid) from these connection portions. There is no leakage.
When the cooling module M described above is filled with the refrigerant liquid, the motor is energized and the impeller 13 is rotationally driven, the refrigerant liquid that has radiated heat at each heat radiating portion 5 and has fallen in temperature is sucked into the liquid feed pump 3. Specifically, the air is guided from the pipe P constituting the circulation path 6 into the pump chamber 10 through the suction port body 15 and the flow path forming member 14 in the branch path.

The refrigerant liquid guided into the pump chamber 10 by the rotationally driven impeller 13 is guided to the discharge port body 16 via the other branch passage in the flow path forming member 14 and discharged from the liquid feed pump 3. . Therefore, the flow path forming member 14, the suction port body 15, and the discharge port body 16 constitute a part of the circulation path 6 described above.
Note that a communication hole 17 is provided in the branch portion of the flow path forming member 14 provided with the discharge flow path so as to penetrate the thick portion. Although only the communication hole 17 provided in the upper surface part of the flow path forming member 14 is shown in the figure, the lower surface part is also provided with a communication hole, and has a total of two communication holes.

Since the communication hole 17 communicates the circulation path 6 serving as a discharge flow path and the reserve tank part 11, a refrigerant liquid is provided between the circulation path 6 and the reserve tank part 11 via the communication hole 17. Can be freely distributed. That is, even if the refrigerant liquid in the cooling module M evaporates over a long period of use, the refrigerant liquid stored in the reserve tank portion 11 is replenished into the circulation path 6 via the communication hole 17, and the circulation path 6 The amount of the refrigerant liquid circulating through is always kept constant.
In addition, in a state where the cooling module M is assembled as will be described later, when the refrigerant liquid is injected from the reserve tank portion 11 in order to supply the refrigerant liquid into the cooling module M, the refrigerant is circulated from the communication hole 17. While the refrigerant liquid is introduced into the path 6, the air that has been in the circulation path 6 is also a hole for gas-liquid separation through which the air is discharged from the communication hole 17 to the reserve tank section 11.

Further, the case body 12 of the liquid feed pump 3 is provided with a first pouring / discharging hole (hole) 18 and a second pouring / discharging hole (hole) 19. Tapered screws are provided on the peripheral surfaces of the first and second pouring holes 18 and 19 and can be opened and closed by a plug body (not shown). When the refrigerant liquid is filled in the assembled state of the cooling module M, the plug body is removed, and a connection port body of the refrigerant liquid injection device described later is inserted. After the refrigerant liquid is completely filled, the connection port body is removed, and the plug body is fitted and sealed through a packing material.
The first and second pouring holes 18 and 19 are provided on the side surface portion opposite to the protruding side surface portions of the suction port body 15 and the discharge port body 16. The first discharge hole 18 passes through the case body 12 and communicates with the circulation path 6 through the pump chamber 10, and the second discharge hole 19 passes through the case body 12 and passes through the reserve tank portion. 11 is provided to communicate with 11. In other words, the first pouring hole 18 is provided opposite to the central axis of the pump chamber 10, while the second pouring hole 19 is a reserve tank portion formed in a substantially U shape. 11 is provided to communicate with the tip of one side end portion.

FIG. 3 is a schematic front view of a refrigerant liquid injection device R for injecting the refrigerant liquid into the manufactured cooling module M, and FIG. 4 is a schematic side view of the refrigerant liquid injection device R and a schematic piping configuration diagram. It is. In either case, the cooling module M as a work is set.
A rotary actuator 21 serving as a rotational drive source is disposed on the base base 20. A rotary shaft 24 supported by two bearing members 23 is coupled to the rotary shaft of the rotary actuator 21 via a coupling 22.

A stage 25 is provided at the tip of the rotary shaft 24 and is rotated as the rotary shaft 24 rotates. A cradle 26 that supports the cooling module M in a detachable manner is provided on the lower side of the stage 25, and the support posture of the cooling module M is converted by the cradle 26 and the rotary actuator 21 that rotationally drives the stage 25. A support mechanism S (support means) is configured.
A mounting plate 28 is provided on the upper side of the stage 25 via an elevating mechanism 27. The mounting plate 28 is provided with a first connection port body 29a and a second connection port body 29b provided with a nozzle portion at the tip. The distance between the first and second connection ports 29a and 29b is the distance between the first pouring hole 18 and the second pouring hole 19 provided in the main body 1 of the cooling module M. Are the same. The mounting plate 28 is provided with three-way switching valves (switching means) 30A, 30B communicating with the connection ports 29a, 29b.

In FIG. 4, the piping tube d connected to one port in the left three-way switching valve 30A communicates with the first connection port 29a on the right side, and piping connected to one port in the right three-way switching valve 30B. The piping tubes d and e intersect each other so that the tube e communicates with the left connection port body 29b. Such a layout is set from a place where there is no space for mounting the two three-way switching valves 30A and 30B side by side, and is not necessarily limited.
One of the remaining ports in each of the three-way switching valves 30A and 30B communicates with a refrigerant liquid tank 40 that is arranged at a predetermined portion via a pipe tube f and stores a refrigerant liquid. In the vicinity of the refrigerant liquid tank 40 of the pipe tube f, a pump 45 is provided, and a flow rate adjustment valve and an on-off valve (not shown) are provided, and a refrigerant liquid supply mechanism (refrigerant liquid supply means) K is constituted by these.

The remaining ports of the three-way switching valves 30A and 30B communicate with the refrigerant liquid recovery tank 50 disposed at a predetermined site via the piping tube g. A pump 55 is provided in the vicinity of the refrigerant liquid recovery tank 50 of the pipe tube g, and these constitute a discharge mechanism (discharge means) H that performs air venting and refrigerant liquid recovery.
In the refrigerant liquid injection device R configured as described above, the refrigerant liquid is injected into the cooling module M manufactured as described below.
The main body 1 of the cooling module M is attached to the cradle 26 of the stage 25, the first and second connection ports 29a and 29b are provided in the cooling module M by lowering the mounting plate 28. Insert into the drain holes 18 and 19. After stopping the lowering of the mounting plate 28, the rotary actuator 21 is driven to rotate the cooling module M together with the stage 25, and the posture of the cooling module M is set as shown in FIG.

That is, the cooling module M is displaced by 90 degrees to change the reserve tank portion 11 formed in a substantially U shape in a normal posture into a horizontal U shape. Therefore, the first pouring hole 18 is in the lower part of the side surface of the main body 1 and the second pouring hole 19 is in the upper part of the side surface. By switching the three-way switching valves 30A and 30B, the first draining hole 18 communicating with the circulation path 6 through the pump chamber 10 communicates with the first connection port body 29a and the refrigerant liquid recovery tank 50, and is reserved. The second discharge hole 19 communicating with the tank portion 11 is set so as to communicate the second connection port body 29b and the refrigerant liquid tank 40.
The pump 45 is driven to perform a first step of supplying the refrigerant liquid from the refrigerant liquid tank 40 to the cooling module M. The refrigerant liquid is filled in the lower side end portion from the second pouring hole 19 through the upper side side end tip formed in the horizontal U shape of the reserve tank portion 11. Since there is no hole in the lower side end of the reserve tank 11, it becomes a so-called corner-like corner m, and refrigerant liquid accumulates from this corner m and the liquid level gradually rises. .

The air that has been accumulated in the reserve tank 11 until then is pushed by the injected refrigerant liquid and guided to the circulation path 6 from the communication hole 17, and from the first pouring hole 18 through the pump chamber 10. The exhaust mechanism H is exhausted.
In this way, in the first step, the amount of refrigerant liquid supplied to the reserve tank unit 11 is extremely small (about 0.5 ml / second), and a large amount of refrigerant liquid is supplied in a short time, so that the communication hole 17 forms the refrigerant. Blocking with liquid is prevented, and air is smoothly vented from the communication hole 17. At this time, the impeller 13 is rotationally driven to operate the liquid feed pump 3, thereby promoting the injection of the refrigerant liquid together with the exhaust action.

In the first step, it is temporarily estimated that the liquid level of the refrigerant liquid injected into the reserve tank unit 11 reaches the communication hole 17 position and the refrigerant liquid flows into the circulation path 6 from the communication hole 17. 45 is stopped and the process proceeds to a second step of stopping the injection of the refrigerant liquid from the refrigerant liquid tank 40. In this second step, the rotary actuator 21 is driven to change the attitude of the cooling module M by 90 degrees.
That is, as shown in FIG. 5 (B), the first and second pouring holes 18 and 19 are changed to the upper surface side of the main body 1, and the reserve tank portion 11 has a normal U The suction port body 15 and the discharge port body 16 protrude downward.

Then, the process proceeds to the third step. At this time, the pump 45 is driven again to inject the refrigerant liquid from the second connection port body 29 b into the reserve tank portion 11 through the second pouring hole 19. The refrigerant liquid injected and accumulated in the reserve tank portion 11 is guided to the circulation path 6 through the communication hole 17 and filled in the heat radiating portion 5. At this time, the liquid supply pump 3 is driven to pressure-feed the refrigerant liquid guided to the circulation path 6, thereby enabling rapid supply of the refrigerant liquid. In addition, the effect | action which exhausts the air of the circulation path 6 from the pump chamber 10 to the discharge mechanism H through the 1st pouring hole 18 is continued.
If the third step is continued for a predetermined time, a part of the refrigerant liquid injected into the cooling module M from the second pouring hole 19 and circulating through the circulation path 6 is discharged from the first pouring hole 18 together with air. Can be confirmed.

The process moves from the third step to the fourth step in a state in which the refrigerant liquid injection amount from the second pouring hole 19 and the refrigerant liquid discharge amount from the first pouring hole 18 are substantially the same. In the fourth step, the refrigerant liquid supply from the refrigerant liquid supply mechanism K is stopped, and the driving of the liquid feed pump 3 is stopped. During this time, the bubble-like air still remaining in the circulation path 6 is exhausted from the first pouring hole 18 to the discharge mechanism H.
When the liquid feed pump 3 is stopped for a predetermined time, the process proceeds to the fifth step of driving the liquid feed pump 3 again. As the liquid feed pump 3 is driven, the refrigerant liquid is pumped into the circulation path 6, and the air bubbles in the circulation path 6 are easily discharged from the first pouring / draining hole 18. In the fifth step, such driving and stopping of the liquid feed pump 3 are repeated a plurality of times, and the bubble air in the circulation path 6 is completely discharged from the first pouring hole 18 to the discharge mechanism H.

When the driving and stopping of the liquid feed pump 3 are repeated in the fifth step and it is confirmed that the refrigerant liquid comes out instead of being discharged from the first pouring hole 18, the air venting from the circulation path 6 is completed. Then, the process proceeds to the sixth step.
In the sixth step, the three-way switching valves 30A and 30B are switched so that the first connection port body 29a and the first pouring hole 18 communicate with the refrigerant liquid supply mechanism K, and the second connection port body 29b and The second pouring hole 19 is communicated with the discharging mechanism H. Then, the pump 45 is driven to inject the refrigerant liquid in the refrigerant liquid tank 40 into the circulation path 6 through the first pouring hole 18.

On the other hand, the pump 55 is actuated to collect the refrigerant liquid overflowing from the reserve tank portion 11 to the second pouring / removing hole 19 through the second connection port body 29b, and air is released from the reserve tank portion 11. If the sixth step is continued for a predetermined time, the refrigerant liquid is completely filled in the circulation path 6 and the air venting operation is completed assuming that the air venting is completed.
In this manner, in the refrigerant liquid injection device R of the present invention, the first pouring hole 18 that communicates with the circulation path 6 of the cooling module M and the second pouring hole that communicates with the reserve tank portion 11. The refrigerant liquid was injected from one side of 19 and the air was vented from the other side. Therefore, the refrigerant liquid injection can be completed in a short time without evacuating the inside of the cooling module M as compared with the refrigerant liquid injection only from the reserve tank portion 11 side where the refrigerant injection is extremely difficult. .

By reversing the direction of refrigerant supply and air bleeding during the work process, it was possible to further shorten the refrigerant liquid injection time. At this time, by changing the support posture of the cooling module M, the air in the cooling module M can be completely removed, and the highly reliable cooling module M can be obtained.
The refrigerant liquid recovery tank 50 and the refrigerant liquid tank 40 are connected to each other through a return circuit having a pump, a filter, and an on-off valve in the middle, thereby filtering the refrigerant liquid recovered in the refrigerant liquid recovery tank 50 to obtain the refrigerant liquid. It can be returned to the tank 40 and reused.
Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

The top view of the cooling module based on embodiment of this invention. The perspective view which decomposed | disassembled the main-body part of the cooling module based on the embodiment. The front view of the refrigerant | coolant liquid injection | pouring apparatus which inject | pours a refrigerant | coolant liquid with respect to the cooling module based on the embodiment. The front view and piping system figure of a refrigerant | coolant liquid injection | pouring apparatus based on the embodiment. The figure which shows a refrigerant | coolant liquid injection | pouring process based on the embodiment in order.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 6 ... Circulation path, 3 ... Liquid feed pump, 2 ... Heat receiving part, 11 ... Reserve tank part, 17 ... Communication hole, M ... Cooling module, 29a ... 1st connection port body, 29b ... 2nd connection port body, 30A, 30B ... three-way switching valve (switching means), K ... refrigerant liquid supply mechanism (refrigerant liquid supply means), H ... discharge mechanism (discharge means), S ... support mechanism (support means), 18 ... first discharge Hole (hole), 19... Second pouring hole (hole).

Claims (3)

In a refrigerant liquid injection device that injects a refrigerant liquid into a cooling module including a liquid feed pump, a heat receiving unit, a heat radiating unit, and a reserve tank communicated via a circulation path,
A first connection port connected to the circulation path of the cooling module and a second connection port connected to the reserve tank;
The first connection port body and the second connection port body communicate with each other via a switching means, and a refrigerant liquid is supplied to one of the first and second connection port bodies according to the switching direction of the switching means. A refrigerant liquid supply means for supplying air and a discharge means for removing air from the other and collecting the refrigerant liquid;
A refrigerant liquid injection apparatus comprising: a support unit that supports the cooling module and converts a support posture of the cooling module according to a switching timing of the switching unit. In a refrigerant liquid injection method for injecting a refrigerant liquid into a cooling module having a liquid feed pump, a heat receiving part, a heat radiating part, and a reserve tank communicated via a circulation path,
Inject the refrigerant liquid into the reserve tank for a predetermined time, fill the corner of the reserve tank with the refrigerant liquid and vent the circulation path,
After that, change the posture of the cooling module, guide the coolant from the reserve tank to the circulation path and vent the circulation path,
Next, the refrigerant liquid injection method is characterized in that the refrigerant liquid is injected into the circulation path and the air is removed from the reserve tank. In a refrigerant liquid injection method for injecting a refrigerant liquid into a cooling module having a liquid feed pump, a heat receiving part, a heat radiating part, and a reserve tank communicated via a circulation path,
Set the orientation of the cooling module so that the hole communicating with the reserve tank of the cooling module is at the top of the side, and the hole communicating with the circulation path is at the bottom of the side, injecting coolant into the reserve tank and venting the circulation path A first step comprising:
A second step of changing the posture of the cooling module so that the respective holes are on the upper surface side after the elapse of a predetermined time;
While injecting the refrigerant liquid from the hole communicating with the reserve tank, driving the liquid feed pump to pump the refrigerant liquid from the reserve tank to the circulation path, and continuing the air vent from the hole communicating with the circulation path A third step of waiting for the refrigerant liquid to be discharged from the hole;
Fourth step of stopping the supply of the refrigerant liquid and stopping the driving of the liquid feeding pump in a state where the refrigerant liquid discharge amount from the hole communicating with the circulation path is substantially the same as the refrigerant liquid injection amount to the reserve tank When,
A fifth step of repeating the driving and stopping of the liquid feeding pump every predetermined time to release air from the circulation path;
A refrigerant liquid is supplied from a hole communicating with the circulation path and is switched to release air from the hole of the reserve tank, and a sixth step is performed to complete the injection in a state where the refrigerant liquid overflows from the reserve tank. A refrigerant liquid injection method characterized by the above.

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