Phase change immersed liquid cooling system for server

Abstract

The invention relates to the technical field of immersed liquid cooling servers, and discloses a phase change immersed liquid cooling system for a server, and the system comprises a cabinet which is provided with a liquid cooling cavity and a gas-liquid outlet, the liquid cooling cavity is communicated with the gas-liquid outlet, and the liquid cooling cavity is used for filling a cooling liquid; the server is accommodated in the liquid cooling cavity, and the server comprises a heating element; the gas inlet end of the condenser is communicated with the gas-liquid outlet; and the flushing assembly comprises a spray head, the liquid inlet end of the spray head communicates with the liquid outlet end of the condenser, and the spray head faces the heating element. According to the phase change immersed liquid cooling system for the server, bubbles on the surface of the heating element can be prevented from being accumulated to generate an air film, and the heat dissipation efficiency and stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of immersion liquid cooling servers, and in particular to a phase change immersion liquid cooling system for servers. Background Art

[0002] As the scale of data centers continues to expand and computing needs increase, the heat dissipation problem of equipment has become increasingly prominent. Traditional air cooling has become increasingly difficult to cope with the challenges of modern data centers due to its high noise, high energy consumption, and inability to meet the heat dissipation needs of high-density, high-power devices. As an emerging heat dissipation method, immersion liquid cooling technology can effectively solve the heat dissipation problem of high-power equipment by immersing electronic components in coolant and taking advantage of the high heat transfer performance of the coolant.

[0003] Specifically, an immersion liquid cooling server directly immerses the heat generating components (such as CPU, GPU, memory, hard disk, etc.) in a non-conductive inert fluid medium (i.e., coolant), and dissipates heat from the equipment through the circulation of the coolant to absorb and release heat. According to the phase change of the coolant during the heat dissipation process, immersion liquid cooling is divided into two types: single-phase immersion liquid cooling and phase change immersion liquid cooling.

[0004] Single-phase immersion liquid cooling uses a coolant with a high boiling point, such as mineral oil, vegetable oil or silicone-based oil. The coolant remains in liquid form after absorbing heat, which can ensure the safe operation of the cooling equipment. However, the disadvantage of this method is that since there is no phase change, the heat transfer efficiency of the liquid is low, resulting in low heat dissipation efficiency. Phase change immersion liquid cooling uses the gasification and condensation process of the coolant to improve the heat transfer efficiency. In actual applications, a large number of bubbles will be generated on the surface of the CPU / GPU during the heat dissipation process. If the bubbles cannot detach from the surface in time, an air film will be formed, which will further affect the heat dissipation efficiency and easily cause the equipment to overheat, thereby affecting the performance and stability of the equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a phase change immersion liquid cooling system for a server, which can prevent the accumulation of bubbles on the surface of the heating element to form an air film when the cooling liquid undergoes a phase change, thereby improving the heat dissipation efficiency and stability.

[0006] In order to achieve the above object, the present invention provides a phase change immersion liquid cooling system for a server, wherein the server includes a heating element, and the phase change immersion liquid cooling system for the server includes:

[0007] A cabinet, wherein the cabinet has a liquid cooling cavity and a gas-liquid outlet, the liquid cooling cavity is connected to the gas-liquid outlet, the liquid cooling cavity is used to be filled with cooling liquid, and the server is accommodated in the liquid cooling cavity;

[0008] A condenser, wherein the air inlet end of the condenser is connected to the gas-liquid outlet;

[0009] A flushing component, the flushing component includes a nozzle, the liquid inlet end of the nozzle is connected to the liquid outlet end of the condenser, and the nozzle is directed toward the heating element.

[0010] Furthermore, the server further comprises a mainboard, the heating element is mounted on the mainboard, the flushing assembly further comprises a bracket, the bracket is mounted on the mainboard, and the nozzle is detachably mounted on the bracket.

[0011] Furthermore, the bracket includes a telescopic rod and a rotating rod, one end of the telescopic rod is installed on the main board, and the other end is connected to the rotating rod, the telescopic rod extends in the up and down directions, the rotating rod can rotate relative to the telescopic rod, the extension direction of the rotating rod is perpendicular to the extension direction of the telescopic rod, the nozzle is installed on the rotating rod, and a first locking portion is provided between the telescopic rod and the rotating rod, and the first locking portion can lock the rotation of the rotating rod.

[0012] Furthermore, the bracket includes two telescopic rods, the two telescopic rods are arranged on the main board at an interval, and the two ends of the rotating rod are respectively arranged on the two telescopic rods.

[0013] Furthermore, the flushing component includes a supercooling part, which is connected between the liquid outlet end of the condenser and the liquid inlet end of the nozzle, and the supercooling part can supercool the coolant condensed by the condenser.

[0014] Furthermore, the supercooling part includes a flow tube, a refrigeration fin and a heat sink, the flow tube is connected between the liquid outlet end of the condenser and the liquid inlet end of the nozzle, the refrigeration fin is coated on the outer peripheral wall of the flow tube, the heat absorption surface of the refrigeration fin faces the side where the flow tube is located, the heat dissipation surface of the refrigeration fin is away from the side where the flow tube is located, and the heat sink is coated on the outer peripheral wall of the refrigeration fin.

[0015] Furthermore, the inner peripheral wall of the flow tube is covered with a spoiler layer.

[0016] Furthermore, the phase change immersion liquid cooling system for the server also includes a cold distribution unit, which is connected between the condenser and the supercooling part. The cabinet also has a liquid inlet, which is connected to the liquid cooling chamber. The cold distribution unit has a liquid inlet end and at least two liquid outlet ends. The liquid inlet end of the cold distribution unit is connected to the liquid outlet end of the condenser, one liquid outlet end of the cold distribution unit is connected to the supercooling part, and the other liquid outlet end of the cold distribution unit is connected to the liquid inlet.

[0017] Furthermore, the phase-change immersion liquid cooling system for the server further includes a liquid storage tank, and the liquid storage tank is connected between the condenser and the cooling capacity distribution unit.

[0018] Compared with the prior art, the phase change immersion liquid cooling system for a server in the embodiment of the present invention has the following beneficial effects: the gas phase coolant is condensed by a condenser to form a liquid phase coolant, and then the liquid phase coolant is sprayed onto the surface of the heating element through the nozzle of the flushing component, so that the bubbles generated on the surface of the heating element are promptly dispersed and flushed, and the bubbles immediately float up to take away the heat, thereby preventing the bubbles from being retained on the surface of the element to form an air film, thereby improving the heat dissipation efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a circuit diagram of a phase change immersion liquid cooling system for a server according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a nozzle, a bracket, a mainboard and a heating element of a phase change immersion liquid cooling system for a server according to an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of a supercooling portion of a phase change immersion liquid cooling system for a server according to an embodiment of the present invention;

[0022] Figure 4 is a cross-sectional view of a flow tube of a phase change immersion liquid cooling system for a server according to an embodiment of the present invention;

[0023] In the figure, 1, cabinet; 101, liquid cooling chamber; 102, gas and liquid outlet; 103, liquid inlet;

[0024] 2. Server; 201. Heating element; 202. Mainboard;

[0025] 3. Condenser;

[0026] 4. Flushing assembly; 401. Nozzle; 402. Bracket; 4021. Telescopic rod; 4022. Rotating rod; 403. Supercooling part; 4031. Flow pipe; 40311. Turbine layer; 4032. Refrigeration sheet; 4033. Heat sink;

[0027] 5. Cold distribution unit;

[0028] 6. Liquid storage tank. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal" and the like used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0031] In the description of the present invention, the terms "provided with", "set", "connected", and "placed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0033] The technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0034] like Figure 1-4 As shown, a phase change immersion liquid cooling system for a server according to an embodiment of the present invention, the server 2 includes a heating element 201, including:

[0035] The cabinet 1 has a liquid cooling chamber 101 and a gas-liquid outlet 102. The liquid cooling chamber 101 is connected to the gas-liquid outlet 102. The liquid cooling chamber 101 is used to be filled with cooling liquid. The server 2 is accommodated in the liquid cooling chamber 101.

[0036] Condenser 3, the air inlet end of condenser 3 is connected with the gas-liquid outlet 102;

[0037] The flushing component 4 includes a nozzle 401 , a liquid inlet end of the nozzle 401 is connected to a liquid outlet end of the condenser 3 , and the nozzle 401 faces the heating element 201 .

[0038] Based on the above technical solution, the gaseous coolant is condensed by the condenser 3 to form a liquid coolant, and then the liquid coolant is sprayed onto the surface of the heating element 201 through the nozzle of the flushing component 4, so that the bubbles generated on the surface of the heating element 201 are promptly dispersed and flushed, and the bubbles immediately float up to take away the heat, preventing the bubbles from being retained on the surface of the component to form an air film, thereby improving the heat dissipation efficiency and stability.

[0039] Preferably, the server 2 further includes a mainboard 202 , the heating element 201 is mounted on the mainboard 202 , the flushing assembly 4 further includes a bracket 402 , the bracket 402 is mounted on the mainboard 202 , and the nozzle 401 is detachably mounted on the bracket 402 .

[0040] Integrating the bracket 402 into the mainboard 202 makes the overall structure more compact, which helps to save space. When the nozzle 401 is installed on the bracket 402, the position of the nozzle 401 corresponds to the heating element 201. When replacing the nozzle 401, there is no need to repeatedly adjust the position. It only needs to be directly installed on the bracket 402. The operation is simple, the maintenance cost is low, and the downtime of the server 2 is reduced.

[0041] More preferably, the bracket 402 includes a telescopic rod 4021 and a rotating rod 4022, one end of the telescopic rod 4021 is installed on the main board 202, and the other end is connected to the rotating rod 4022, the telescopic rod 4021 extends in the up and down directions, the rotating rod 4022 can rotate relative to the telescopic rod 4021, the extension direction of the rotating rod 4022 is perpendicular to the extension direction of the telescopic rod 4021, the nozzle 401 is installed on the rotating rod 4022, and a first locking portion is provided between the telescopic rod 4021 and the rotating rod 4022, and the first locking portion can lock the rotation of the rotating rod 4022 (the first locking portion is not shown in the drawings in the specification).

[0042] More preferably, the bracket 402 includes two telescopic rods 4021 , the two telescopic rods 4021 are arranged on the main board 202 at an interval, and the two ends of the rotating rod 4022 are respectively arranged on the two telescopic rods 4021 .

[0043] In a specific embodiment, the first locking portion includes a ratchet and a pawl. A ratchet groove is provided at one end of the telescopic rod 4021 close to the rotating rod 4022. The pawl is arranged on the groove wall of the ratchet groove. A bearing groove is provided on the groove bottom of the ratchet groove. A bearing is arranged in the bearing groove. The end of the rotating rod 4022 is inserted into the bearing. The bearing allows the rotating rod 4022 to rotate relative to the telescopic rod 4021. The ratchet is arranged on the rotating rod 4022. The ratchet is accommodated in the ratchet groove. The ratchet groove abuts against the pawl. The ratchet and the pawl allow the rotating rod 4022 to rotate relative to the telescopic rod 4021. 022 rotates in a single direction. When the nozzle 401 sprays coolant to the heating element 201, a reaction force is applied to the rotating rod 4022, causing it to have a tendency to rotate. This may cause the coolant sprayed by the nozzle 401 to not accurately correspond to the heating element 201, and the heat dissipation effect is greatly reduced. A ratchet and a pawl are provided. When the nozzle 401 sprays coolant to the heating element 201, the pawl abuts against the ratchet to prevent the rotating rod 4022 from unnecessary rotation, thereby ensuring that the coolant can be accurately sprayed onto the heating element 201.

[0044] In a preferred embodiment, a mounting portion is provided on the rotating rod 4022, and the mounting portion is used to mount the nozzle 401. The mounting portion can slide along the extension direction of the rotating rod 4022. A second locking portion is provided between the mounting portion and the rotating rod 4022, and the second locking portion can lock the sliding of the mounting portion.

[0045] The extension and retraction of the telescopic rod 4021, the sliding of the mounting portion and the rotation of the rotating rod 4022, multiple structures jointly adjust the position of the nozzle 401 and the angle of the coolant injection. Since the boiling behaviors of different coolants are inconsistent, it is necessary to timely adjust the injection position and injection angle of the coolant according to the density of the bubbles generated during the specific boiling, the size of the bubbles, etc., to ensure the continuous heat dissipation effect of the system.

[0046] Preferably, the flushing component 4 includes a supercooling portion 403 , which is connected between the liquid outlet of the condenser 3 and the liquid inlet of the nozzle 401 . The supercooling portion 403 can supercool the coolant condensed by the condenser 3 .

[0047] Through the supercooling treatment, the coolant is already in a low-temperature state when it is sprayed onto the heating element 201, which helps to achieve more efficient heat exchange on the surface of the heating element 201 and improve the heat dissipation effect. The lower the temperature of the coolant, the more heat it can take away, thereby enhancing the cooling capacity of the system; the supercooling part 403 can prevent the coolant from evaporating too quickly in the high-temperature area to generate bubbles by lowering the temperature of the coolant, thereby avoiding the occurrence of bubble accumulation, helping to maintain the stability of the liquid flow, and ensuring that the system can work efficiently even under high load.

[0048] More preferably, the supercooling part 403 includes a flow tube 4031, a cooling fin 4032 and a heat sink 4033, the flow tube 4031 is connected between the liquid outlet end of the condenser 3 and the liquid inlet end of the nozzle 401, the cooling fin 4032 is coated on the outer peripheral wall of the flow tube 4031, the heat absorption surface of the cooling fin 4032 faces the side where the flow tube 4031 is located, the heat dissipation surface of the cooling fin 4032 faces away from the side where the flow tube 4031 is located, and the heat sink 4033 is coated on the outer peripheral wall of the cooling fin 4032.

[0049] The flow tube 4031 cools the condensed coolant to a supercooled state, and the cooling plate 4032 absorbs heat from the flow tube 4031 through the heat absorption surface, and then outputs the heat to the heat sink 4033 through the heat dissipation surface for heat dissipation.

[0050] The heat sink 4033 is wrapped around the periphery of the cooling fin 4032, which can provide a larger heat dissipation surface area, thereby improving the heat dissipation efficiency. The surface of the heat sink 4033 continuously dissipates heat through contact with the outside air, effectively enhancing the heat exchange capacity of the system and ensuring that the coolant is at a lower temperature before entering the nozzle 401, thereby improving the heat dissipation performance.

[0051] More preferably, the inner peripheral wall of the flow tube 4031 is covered with a spoiler layer 40311 .

[0052] In an optional embodiment, the flow tube 4031 and the spoiler layer 40311 are integrally provided, and the spoiler layer 40311 is internally threaded.

[0053] The spoiler layer 40311 enhances the stirring effect of the fluid by generating turbulence. Turbulent flow has a higher heat convection capacity than laminar flow, so that the coolant can exchange heat with the tube wall of the flow tube 4031 more evenly; the spoiler layer 40311 increases the disturbance of the coolant in the flow tube 4031, improves the convective heat transfer coefficient of the coolant to the flow tube, and effectively increases the heat transfer area between the coolant and the tube wall, thereby achieving the effect of enhanced heat transfer.

[0054] More preferably, the phase change immersion liquid cooling system for the server also includes a cold distribution unit 5, which is connected between the condenser 3 and the supercooling part 403. The cabinet 1 also has a liquid inlet 103, which is connected to the liquid cooling chamber 101. The cold distribution unit 5 has a liquid inlet end and at least two liquid outlet ends. The liquid inlet end of the cold distribution unit 5 is connected to the liquid outlet end of the condenser 3, one liquid outlet end of the cold distribution unit 5 is connected to the supercooling part 403, and the other liquid outlet end of the cold distribution unit 5 is connected to the liquid inlet.

[0055] The cooling distribution unit 5 can distribute the cooling liquid to the supercooling part 403 and the cabinet 1 according to different needs. By adjusting the flow rate of different liquid outlets, the temperature of each cooling area can be accurately controlled to ensure that each area in the liquid cooling system can be fully cooled; a large amount of condensed cooling liquid flows into the cabinet 1 through the cooling distribution unit 5, and part of the condensed cooling liquid is sprayed to the heating element 201 through the nozzle 401 after being supercooled by the supercooling part 403. Since there is a large amount of cooling liquid in the liquid cooling chamber 101 and the server 2 is in a low temperature environment, the cooling liquid sprayed onto the heating element 201 has a small temperature difference with the ambient temperature of the liquid cooling chamber 101, so the evaporation rate of the cooling liquid can be slowed down, and the cooling liquid can be effectively prevented from boiling too quickly, thereby controlling the boiling state of the cooling liquid, maintaining the stable state of the cooling liquid, and ensuring a smooth cooling process.

[0056] More preferably, the phase change immersion liquid cooling system for the server further includes a liquid storage tank 6 , which is connected between the condenser 3 and the cooling capacity distribution unit 5 .

[0057] The liquid storage tank 6 can balance the supply and demand of the coolant and ensure a stable supply of the coolant. In particular, when the load of the server 2 changes greatly, the liquid storage tank 6 can provide additional coolant to ensure the continuity and stability of cooling; since the flow demand of the condenser 3 and the cooling distribution unit 5 in the system and the temperature change of the coolant may fluctuate, the liquid storage tank 6 acts as a buffer device to slow down these fluctuations and ensure that the system can maintain a constant flow and a stable cooling effect in any working state.

[0058] In summary, the embodiment of the present invention provides a phase change immersion liquid cooling system for a server, wherein the gas phase coolant is condensed by the condenser 3 to form a liquid phase coolant, and then the liquid phase coolant is sprayed onto the surface of the heating element 201 through the nozzle of the flushing component 4, so that the bubbles generated on the surface of the heating element 201 are promptly dispersed and flushed, and the bubbles immediately float up to take away the heat, thereby preventing the bubbles from being retained on the surface of the element to form an air film, thereby improving the heat dissipation efficiency and stability.

[0059] In another specific embodiment, the phase change immersion liquid cooling system of the present invention can also use a single-phase coolant for cooling.

[0060] Specifically, in the present case where the condenser 3 is replaced with a cooler, the flow path of the single-phase coolant is consistent with the flow path of the two-phase coolant, and its working process will not be described in detail.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A phase change immersion liquid cooling system for a server, the server (2) comprising a heating element (201), characterized in that: include: A cabinet (1), the cabinet (1) having a liquid cooling chamber (101) and a gas-liquid outlet (102), the liquid cooling chamber (101) being in communication with the gas-liquid outlet (102), the liquid cooling chamber (101) being used to be filled with cooling liquid, and the server (2) being accommodated in the liquid cooling chamber (101); A condenser (3), wherein the air inlet end of the condenser (3) is connected to the gas-liquid outlet (102). A flushing component (4), the flushing component (4) comprising a nozzle (401), the liquid inlet end of the nozzle (401) being connected to the liquid outlet end of the condenser (3), and the nozzle (401) facing the heating element (201).

2. According to the phase change immersion liquid cooling system for a server according to claim 1, the server (2) further comprises a motherboard (202), the heating element (201) is mounted on the motherboard (202), and is characterized in that: The flushing assembly (4) further comprises a bracket (402), wherein the bracket (402) is mounted on the main board (202), and the spray head (401) is detachably mounted on the bracket (402).

3. The phase change immersion liquid cooling system for a server according to claim 2, characterized in that: The bracket (402) comprises a telescopic rod (4021) and a rotating rod (4022), one end of the telescopic rod (4021) is mounted on the main board (202), and the other end is connected to the rotating rod (4022), the telescopic rod (4021) extends in the up-down direction, the rotating rod (4022) can rotate relative to the telescopic rod (4021), the extension direction of the rotating rod (4022) is perpendicular to the extension direction of the telescopic rod (4021), the nozzle (401) is mounted on the rotating rod (4022), and a first locking portion is provided between the telescopic rod (4021) and the rotating rod (4022), and the first locking portion can lock the rotation of the rotating rod (4022).

4. The phase change immersion liquid cooling system for a server according to claim 3, characterized in that: The bracket (402) comprises two telescopic rods (4021), the two telescopic rods (4021) are arranged on the main board (202) at intervals, and the two ends of the rotating rod (4022) are respectively arranged on the two telescopic rods (4021).

5. The phase change immersion liquid cooling system for a server according to claim 1, characterized in that: The flushing assembly (4) comprises a supercooling portion (403), wherein the supercooling portion (403) is connected between the liquid outlet end of the condenser (3) and the liquid inlet end of the nozzle (401), and the supercooling portion (403) is capable of supercooling the coolant after condensation of the condenser (3).

6. The phase change immersion liquid cooling system for a server according to claim 5, characterized in that: The supercooling part (403) comprises a flow tube (4031), a cooling fin (4032) and a heat sink (4033); the flow tube (4031) is connected between the liquid outlet end of the condenser (3) and the liquid inlet end of the nozzle (401); the cooling fin (4032) is coated on the outer peripheral wall of the flow tube (4031); the heat absorption surface of the cooling fin (4032) faces the side where the flow tube (4031) is located; the heat dissipation surface of the cooling fin (4032) faces away from the side where the flow tube (4031) is located; and the heat sink (4033) is coated on the outer peripheral wall of the cooling fin (4032).

7. The phase change immersion liquid cooling system for a server according to claim 6, characterized in that: The inner peripheral wall of the flow tube (4031) is covered with a spoiler layer (40311).

8. The phase change immersion liquid cooling system for a server according to claim 5, characterized in that: The cabinet (1) further comprises a cold distribution unit (5), wherein the cold distribution unit (5) is connected between the condenser (3) and the supercooling portion (403), and the cabinet (1) further comprises a liquid inlet (103), wherein the liquid inlet (103) is connected to the liquid cooling chamber (101), and the cold distribution unit (5) comprises a liquid inlet end and at least two liquid outlet ends, wherein the liquid inlet end of the cold distribution unit (5) is connected to the liquid outlet end of the condenser (3), one liquid outlet end of the cold distribution unit (5) is connected to the supercooling portion (403), and the other liquid outlet end of the cold distribution unit (5) is connected to the liquid inlet.

9. The phase change immersion liquid cooling system for a server according to claim 8, characterized in that: It also includes a liquid storage tank (6), wherein the liquid storage tank (6) is connected between the condenser (3) and the cold distribution unit (5).

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