Immersed cooling system

Abstract

The present invention relates to an immersed cooling system, comprising: a box body having a first accommodating space and a second accommodating space wherein the first accommodating space accommodates a heat dissipation medium and at least one heating unit; the condensing unit is arranged in the second accommodating space; the at least one valve unit is arranged in the box body and corresponds to the second accommodating space and the condensing unit; when the valve unit is opened, the gasified heat dissipation medium flows to impact the condensation unit so as to blow off the liquefied heat dissipation medium attached to the condensation unit.

Description

Technical Field

[0001] The invention relates to a cooling system, in particular to an immersion cooling system which increases heat exchange efficiency by using a gas pressure relief mechanism. Background Art

[0002] The two-phase immersion cooling method uses the phase transition between the gaseous and liquid states of the water-cooling liquid to remove heat. Specifically, for example, the water-cooling liquid in the sealed barrel tank vaporizes after absorbing the heat energy generated by the heating element. The vaporized water-cooling liquid condenses on the condenser after contacting the condenser, and the water-cooling liquid droplets condensed on the condenser fall back into the water-cooling liquid by gravity, thereby achieving the effect of heat dissipation of the heating element through this cycle.

[0003] However, the existing two-phase immersion cooling method still has the problem that water-cooled liquid droplets adhere to the surface of the condenser and cannot fall by gravity, which will lead to low heat exchange efficiency of the condenser or even failure.

[0004] The existing solution to the above problem is to increase the speed of the water pump to increase the efficiency of cold water entering the condenser, or to increase the speed of the fan to increase the heat dissipation efficiency of the hot water in the condenser. However, this method will increase energy consumption and is not helpful in solving the problem of water-cooling droplets still adhering to the surface of the condenser. In addition, when the equipment is shut down and the cover is opened, the residual water-cooling liquid vapor will escape, causing the need to replenish the water-cooling liquid and increase costs. Summary of the invention

[0005] The present invention relates to an immersion cooling system, comprising: a box body, having a first accommodating space and a second accommodating space arranged along a first direction, wherein the first accommodating space accommodates a heat dissipation medium for configuring at least one heating unit immersed in the heat dissipation medium, and the heat dissipation medium vaporizes after absorbing the heat energy of the heating unit, and the vaporized heat dissipation medium moves from the first accommodating space to the second accommodating space; a condensing unit, arranged in the second accommodating space along the first direction and a second direction perpendicular to the first direction, for heat exchange with the vaporized heat dissipation medium to condense and liquefy; and at least one valve unit, arranged in the box body along the second direction and corresponding to the second accommodating space and the condensing unit; wherein when the valve unit is opened, the vaporized heat dissipation medium flows to impact the condensing unit to blow off the liquefied heat dissipation medium attached to the condensing unit.

[0006] As in the aforementioned immersion cooling system, the valve unit opens when the internal pressure of the box rises to above 1 atmosphere.

[0007] As in the aforementioned immersion cooling system, the condensing unit is defined with an upper half and a lower half in the first direction, and the valve unit corresponds to the upper half.

[0008] As in the aforementioned immersion cooling system, the number of the valve units is plural, the condensing unit defines a plurality of sections in the second direction, and the number of the plurality of sections corresponds to the number of the plurality of valve units.

[0009] As in the aforementioned immersion cooling system, the plurality of valve units are respectively located at the midpoints of the plurality of intervals in the second direction.

[0010] As in the aforementioned immersion cooling system, the distance between the valve unit and the bottom side of the condensing unit is 2 / 3 of the total length of the condensing unit in the first direction.

[0011] In the aforementioned immersion cooling system, the total opening area of ​​the valve unit is 1 / 6 of the total cross-sectional area of ​​the condensing unit in the first direction and the second direction.

[0012] As in the aforementioned immersion cooling system, the first direction is the direction of gravity.

[0013] As in the aforementioned immersion cooling system, the condensing unit is a U-shaped condenser, a straight condenser or a serpentine condenser.

[0014] As in the aforementioned immersion cooling system, it also includes a recovery unit, wherein the recovery unit has a water outlet pipe, a tank body, a pump and a water inlet pipe, the water outlet pipe is connected to the tank body and the valve unit, the water inlet pipe is connected to the tank body and the first accommodating space, and the pump is arranged on the water inlet pipe, when the valve unit is opened, the vaporized heat dissipation medium enters the water outlet pipe through the valve unit, and then enters the tank body for condensation, and the condensed heat dissipation medium is driven by the pump to enter the first accommodating space through the water inlet pipe.

[0015] The immersion cooling system as mentioned above further includes a monitoring unit for controlling the valve unit to be opened or closed according to one or more of the plurality of sensing parameters obtained by the monitoring unit.

[0016] As in the aforementioned immersion cooling system, the multiple sensing parameters include the water inlet temperature of the condensing unit, the water outlet temperature of the condensing unit, the water inlet flow rate of the condensing unit, the water outlet flow rate of the condensing unit, the fan speed of the condensing unit, the temperature of the heat dissipation medium in the box, the temperature of the heat dissipation medium vaporized in the box, the pressure of the heat dissipation medium vaporized in the box and the temperature of the heating unit.

[0017] In summary, the immersion cooling system of the present invention uses a gas pressure relief mechanism to utilize the gasified heat dissipation medium flow to impact the condensing unit to blow off the liquid attached to the condensing unit, thereby avoiding the problem of condenser failure caused by excessive liquid on the surface of the condensing unit, thereby increasing the heat exchange efficiency of the condenser, and at the same time, it can also reduce the gas pressure and liquid boiling point inside the tank body, and increase the gas convection inside the tank body to even out the gas temperature inside the tank body. In addition, because the immersion cooling system of the present invention has the above-mentioned gas pressure relief mechanism, it is not necessary to increase the fan speed or the water pump speed in the prior art, which can indirectly reduce energy consumption. In addition, because the immersion cooling system of the present invention has a recovery unit, it can recover the gasified heat dissipation medium after the flow impacts the condensing unit, and before the system is shut down and the cover is opened, the residual heat dissipation medium vapor can be discharged into the recovery unit, thereby reducing the escape of residual vapor, reducing the need for non-conductive liquid replenishment and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the immersion cooling system of the present invention.

[0019] Figure 2 It is a front view of the interior of the box in the immersion cooling system of the present invention.

[0020] Figure 3 It is a side view of the interior of the box in the immersion cooling system of the present invention.

[0021] Figure 4 It is a front view of another embodiment of the interior of the box in the immersion cooling system of the present invention.

[0022] Description of Reference Numerals

[0023] 1000 Immersion Cooling System

[0024] 1 Cabinet

[0025] 11. First storage space

[0026] 111 Heat dissipation medium

[0027] 1111 Vaporized heat dissipation medium

[0028] 1112,1113 Liquefied heat dissipation medium

[0029] 112 Heating Unit

[0030] 12 Second storage space

[0031] 2 Condensing unit

[0032] 21 Upper part

[0033] 22 Lower half

[0034] 23 interval

[0035] 24. Flow diversion device

[0036] 3 valve units

[0037] 4 Recovery Unit

[0038] 41 Water outlet pipe

[0039] 42 tank

[0040] 43 Pump

[0041] 44 Water inlet pipe

[0042] 5 Monitoring Unit

[0043] D Flow direction

[0044] X1 First direction

[0045] X2 Second direction. DETAILED DESCRIPTION

[0046] The following describes the implementation of the present invention through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification, and can also implement or apply it through other different specific embodiments.

[0047] See also Figure 1 , Figure 2 and Figure 3 The immersion cooling system 1000 of the present invention comprises a housing 1, a condensing unit 2, at least one valve unit 3, a recovery unit 4 and a monitoring unit 5. The structures of the components and the connection relationship between them are described in detail below, wherein some drawings illustrate a first direction X1 and a second direction X2 perpendicular to each other. In addition, the number of valve units 3 can be one or more, and the following embodiment is described by taking three valve units 3 as an example, but the present invention is not limited thereto.

[0048] The box body 1 may be a two-phase immersion cooling positive high pressure sealed barrel tank, which has a first accommodation space 11 and a second accommodation space 12 arranged vertically and interconnected along a first direction X1. In this embodiment, the first direction X1 may be the direction of gravity.

[0049] The first accommodation space 11 is provided with a heat dissipation medium 111 (liquid), and can be equipped with at least one or more heating units 112. The heat dissipation medium 111 can be, for example, a non-conductive water-cooling liquid, and the heating unit 112 can be, for example, a CPU, a graphics chip, other types of chips or heat sources on a pluggable motherboard or circuit board in a server, but the present invention is not limited thereto. The heating units 112 are all immersed in the heat dissipation medium 111, so that the heat dissipation medium 111 can absorb the heat energy generated by the heating unit 112 and then vaporize, and the vaporized heat dissipation medium 1111 can move from the first accommodation space 11 to the second accommodation space 12.

[0050] The condensing unit 2 is arranged in the second accommodation space 12 along the first direction X1 and the second direction X2, for example, adjacent to the rear side of the housing 1. In the present embodiment, the condensing unit 2 may be a condenser, such as a U-shaped condenser, a straight condenser or a serpentine condenser, and both ends of the condenser may be connected to a loop-shaped pipe, and a heat exchange device (such as a heat pipe), a water cooling radiator (such as a fan) and a pump may be provided on the loop-shaped pipe, and the pump may drive the water-cooling liquid in the condenser and the loop-shaped pipe. That is, after the water-cooling liquid in the condensing unit 2 exchanges heat with the vaporized heat dissipation medium 1111, the heated water-cooling liquid will flow along the loop-shaped pipe to the heat exchange device for cooling, and the pump may drive the cooled water-cooling liquid to return to the condensing unit 2 through the loop-shaped pipe again for the next cycle of heat exchange. After heat exchange, the vaporized heat dissipation medium 1111 will condense and liquefy on the copper tube surface of the condensation unit 2 (e.g., condenser). A portion of the liquefied heat dissipation medium 1112 may fall back to the heat dissipation medium 111 in the first accommodation space 11 by gravity, and a portion of the liquefied heat dissipation medium 1113 may adhere to the copper tube surface of the condensation unit 2 (e.g., condenser).

[0051] In one embodiment, the condensing unit 2 is defined with an upper half 21 and a lower half 22 equally divided in the first direction X1, and a plurality of equally divided sections 23 are defined in the second direction X2. The number of the plurality of sections 23 corresponds to the number of the valve units 3, for example, 3. In addition, in order to allow the vaporized heat dissipation medium 1111 to flow through the condensing unit 2 to the greatest extent, as shown in FIG. Figure 4 As shown, two guide devices 24 (such as guide vanes) may be provided on the bottom side of the condensing unit 2 as appropriate to guide the vaporized heat dissipation medium 1111 to the condensing unit 2 .

[0052] The valve units 3 are arranged at a distance from each other along the second direction X2 at the rear side of the housing 1, and correspond to the second accommodating space 12 and the condensing unit 2. In the present embodiment, the valve unit 3 may be an electronic exhaust valve or a manual exhaust valve, but is not limited thereto. In addition, the valve unit 3 corresponds to the upper half 21 of the condensing unit 2, and the three valve units 3 correspond to the midpoints of the three intervals 23 in the second direction X2, respectively, but the present invention is not limited thereto. In one embodiment, the distance between the valve unit 3 and the bottom side of the condensing unit 2 may be 2 / 3 of the total length of the condensing unit 2 in the first direction X1, but the present invention is not limited thereto. In another embodiment, the total opening area of ​​the three valve units 3 is 1 / 6 of the total cross-sectional area of ​​the condensing unit 2 in the first direction X1 and the second direction X2, but the present invention is not limited thereto.

[0053] The recovery unit 4 has a water outlet pipe 41, a tank body 42, a pump 43 and a water inlet pipe 44, the water outlet pipe 41 is connected to the tank body 42 and the valve unit 3, the water inlet pipe 44 is connected to the tank body 42 and the first accommodation space 11, and the pump 43 is arranged on the water inlet pipe 44, wherein the tank body 42 may have a heat exchange device (such as a heat pipe) and a water cooling row (such as a fan), but the present invention is not limited thereto. When the valve unit 3 is opened, the vaporized heat dissipation medium 1111 enters the water outlet pipe 41 (flow direction D) through the valve unit 3, and then enters the tank body 42 to be condensed through the heat exchange device and the water cooling row, and the condensed heat dissipation medium 111 is driven by the pump 43 and enters the first accommodation space 11 through the water inlet pipe 44. Therefore, the recovery unit 4 of the present invention can effectively recycle the heat dissipation medium 111 for reuse. In addition, the recovery unit 4 of the present invention can be used not only when the system is running, but also before the system is shut down and the cover is opened, so as to discharge the vaporized heat dissipation medium 1111 remaining in the second accommodating space 12 into the recovery unit 4, thereby reducing the escape of residual steam when the cover is opened.

[0054] The monitoring unit 5 may be, for example, a cooling distribution unit (CDU) for controlling the valve unit 3 to be opened or closed. Specifically, the immersion cooling system 1000 of the present invention may be provided with a plurality of sensors (not shown), which are electrically connected to the monitoring unit 5, and the sensors may be, for example, temperature sensors, pressure sensors, flow sensors or speed sensors, etc. The position of the sensors may be, for example, set at the water inlet and water outlet ends of the condensing unit 2 to obtain sensing parameters such as the water inlet temperature, the water outlet temperature, the water inlet flow rate, and the water outlet flow rate. The sensors may also be, for example, set at the place where the water cooling row of the condensing unit 2 is connected to obtain sensing parameters such as the fan speed. The sensors may also be, for example, set in the first accommodation space 11 and the second accommodation space 12 to obtain sensing parameters such as the temperature (liquid state) of the heat dissipation medium 111 in the box 1, the temperature of the heat dissipation medium 1111 vaporized in the box 1, the pressure of the heat dissipation medium 1111 vaporized in the box 1, and the temperature of the heating unit 112. In this way, the monitoring unit 5 can obtain the above-mentioned sensing parameters and control the valve unit 3 to be opened or closed according to one or more of the above-mentioned sensing parameters.

[0055] The operation of the immersion cooling system 1000 of the present invention is as follows. In this embodiment, if the liquefied heat dissipation medium 1113 is attached to the copper tube surface of the condensing unit 2 (such as the condenser), the area of ​​the copper tube surface of the condensing unit 2 that the vaporized heat dissipation medium 1111 can contact will be reduced, which means that the heat exchange rate is reduced or even fails. Since the vaporized heat dissipation medium 1111 cannot effectively perform heat exchange, that is, it cannot be condensed, the vaporized heat dissipation medium 1111 will continue to accumulate, so that the internal pressure of the housing 1 increases, and the boiling point of the heat dissipation medium 111 will also increase at the same time, and the heating unit 112 will overheat. Therefore, whether the heat exchange rate of the condensing unit 2 is reduced or failed can be judged by whether the internal pressure of the housing 1 (or the pressure of the vaporized heat dissipation medium 1111) rises to above 1 atmosphere (atm). When the pressure inside the box 1 rises to above 1 atmosphere, the valve unit 3 can be opened. Since the atmospheric pressure inside the box 1 is greater than the atmospheric pressure outside the box 1, and the valve unit 3 corresponds to the condensing unit 2 and the second accommodation space 12, the flow direction of the gas will be from inside the box 1 to outside the box 1. At this time, the vaporized heat dissipation medium 1111 will flow quickly to impact the condensing unit 2 (flow direction D) to blow off the liquefied heat dissipation medium 1113 attached to the condensing unit 2, and can leave the second accommodation space 12 through the valve unit 3 and enter the recovery unit 4. In this embodiment, the so-called above 1 atmosphere refers to 1.05 atmospheres, but the present invention is not limited thereto, as long as the atmospheric pressure inside the box 1 is greater than the atmospheric pressure outside the box 1.

[0056] In other embodiments, the water inlet temperature and the water outlet temperature of the condensing unit 2 can be used to determine whether the heat exchange rate of the condensing unit 2 is reduced or failed. For example, when the water inlet temperature is 31.4 degrees C and the water outlet temperature is 33.3 degrees C (for example, the temperature difference between the two is less than 3 degrees C), and the internal pressure of the housing 1 increases, it can be determined that the heat exchange rate of the condensing unit 2 is reduced or failed. At this time, the valve unit 3 can be opened to allow the vaporized heat dissipation medium 1111 to flow rapidly to impact the condensing unit 2, so as to blow off the liquefied heat dissipation medium 1113 attached to the condensing unit 2.

[0057] In another embodiment, the opening timing of the valve unit 3 can also be determined by the increase degree of the internal pressure of the housing 1 (for example, an increase of 0.2 bar), the inlet and outlet water flow of the condensing unit 2, the fan speed, the increase degree of the temperature (liquid) of the heat dissipation medium 111 in the housing 1, the temperature of the vaporized heat dissipation medium 1111 in the housing 1 or the temperature of the heating unit 112 (for example, exceeding a predetermined threshold value), etc. Specifically, when the temperature (liquid) of the heat dissipation medium 111 in the housing 1 is 5 degrees C higher than the original specification boiling point, the valve unit 3 can be opened; when the temperature of the vaporized heat dissipation medium 1111 in the housing 1 is 10 degrees C higher than the original specification steam temperature, the valve unit 3 can be opened; when the temperature of the heating unit 112 is close to the allowable specification temperature of the element within 5 degrees C, and the inlet and outlet water flow of the condensing unit 2 and the fan speed are not increased, the valve unit 3 can be opened.

[0058] The verification results of the immersion cooling system 1000 of the present invention are as follows. When the condensing unit 2 fails, the air pressure in the tank 42 increases by 0.2 bar, and the heat removal capacity is only 659 W after calculation. After the above-mentioned use of the vaporized heat dissipation medium 1111 to quickly flow and impact the condensing unit 2 to blow off the liquefied heat dissipation medium 1113 attached to the condensing unit 2, the air pressure in the tank 42 drops to 0 bar, and the heat removal capacity is calculated to be 1565 W. This is sufficient to prove that the present invention can indeed repair the problem of reduced heat exchange rate or failure due to excessive liquid attachment on the surface of the condensing unit 2.

[0059] In summary, the immersion cooling system of the present invention uses a gas pressure relief mechanism to utilize the vaporized heat dissipation medium flow to impact the condensing unit to blow off the liquid attached to the condensing unit, thereby avoiding the problem of condenser failure caused by excessive liquid on the surface of the condensing unit, thereby increasing the heat exchange efficiency of the condenser, and at the same time, it can also reduce the gas pressure and liquid boiling point inside the tank body, and increase the gas convection inside the tank body to even out the gas temperature inside the tank body. In addition, because the immersion cooling system of the present invention has the above-mentioned gas pressure relief mechanism, it is not necessary to increase the fan speed or the water pump speed in the prior art to reduce energy consumption. In addition, because the immersion cooling system of the present invention has a recovery unit, it can recover the vaporized heat dissipation medium after the flow impacts the condensing unit, and before the system is shut down and the cover is opened, the residual heat dissipation medium vapor can be discharged into the recovery unit, thereby reducing the escape of residual vapor, reducing the need for non-conductive liquid replenishment, and reducing costs.

[0060] The above embodiments are only used to illustrate the technical principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art may modify and change the above embodiments without violating the spirit and scope of the present invention. However, any equivalent modifications and changes made using the contents disclosed by the present invention should still be covered by the claims. The scope of protection of the present invention should be as listed in the attached claims.

Claims

1. An immersion cooling system, characterized in that: The immersion cooling system includes: The box body has a first accommodating space and a second accommodating space arranged along a first direction, wherein the first accommodating space accommodates a heat dissipation medium for arranging at least one heating unit immersed in the heat dissipation medium, and the heat dissipation medium vaporizes after absorbing heat energy of the heating unit, and the vaporized heat dissipation medium moves from the first accommodating space to the second accommodating space; A condensing unit is disposed in the second accommodating space along the first direction and a second direction perpendicular to the first direction, and is used for heat exchange with the vaporized heat dissipation medium to condense and liquefy it; and At least one valve unit is disposed on the housing along the second direction and corresponds to the second accommodating space and the condensing unit; When the valve unit is opened, the vaporized heat dissipation medium flows and impacts the condensation unit to blow off the liquefied heat dissipation medium attached to the condensation unit.

2. The immersion cooling system according to claim 1, characterized in that: The valve unit opens when the pressure inside the box rises to above 1 atmosphere.

3. The immersion cooling system according to claim 2, characterized in that: The condensing unit is defined with an upper half and a lower half in the first direction, and the valve unit corresponds to the upper half.

4. The immersion cooling system according to claim 3, characterized in that: The number of the valve units is plural, the condensing unit is defined with a plurality of sections in the second direction, and the number of the plurality of sections corresponds to the number of the plurality of valve units.

5. The immersion cooling system according to claim 4, characterized in that: The plurality of valve units are respectively located at the midpoints of the plurality of intervals in the second direction.

6. The immersion cooling system according to claim 3, characterized in that: The distance between the valve unit and the bottom side of the condensing unit is 2 / 3 of the total length of the condensing unit in the first direction.

7. The immersion cooling system according to claim 1, characterized in that: The total opening area of ​​the valve unit is 1 / 6 of the total cross-sectional area of ​​the condensing unit in the first direction and the second direction.

8. The immersion cooling system according to claim 1, characterized in that: The first direction is the direction of gravity.

9. The immersion cooling system according to claim 1, characterized in that: The condensing unit is a U-shaped condenser, a straight condenser or a serpentine condenser.

10. The immersion cooling system according to claim 1, characterized in that: The immersion cooling system also includes a recovery unit, wherein the recovery unit has a water outlet pipeline, a tank body, a pump and a water inlet pipeline, the water outlet pipeline is connected to the tank body and the valve unit, the water inlet pipeline is connected to the tank body and the first accommodating space, and the pump is arranged on the water inlet pipeline, when the valve unit is opened, the vaporized heat dissipation medium enters the water outlet pipeline through the valve unit, and then enters the tank body for condensation, and the condensed heat dissipation medium is driven by the pump to enter the first accommodating space through the water inlet pipeline.

11. The immersion cooling system according to claim 1, characterized in that: The immersion cooling system further includes a monitoring unit for controlling the valve unit to be opened or closed according to one or more of a plurality of sensing parameters obtained by the monitoring unit.

12. The immersion cooling system according to claim 11, characterized in that: The multiple sensing parameters include the water inlet temperature of the condensing unit, the water outlet temperature of the condensing unit, the water inlet flow rate of the condensing unit, the water outlet flow rate of the condensing unit, the fan speed of the condensing unit, the temperature of the heat dissipation medium in the box, the temperature of the heat dissipation medium vaporized in the box, the pressure of the heat dissipation medium vaporized in the box and the temperature of the heating unit.

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