Immersed heat dissipation system

Abstract

The utility model discloses an immersed heat dissipation system which comprises a shell provided with a solution cavity, cooling liquid located in the solution cavity, a heat source immersed in the cooling liquid, a heat exchanger located outside the shell, a connecting pipe assembly connected with the heat exchanger and a liquid pump arranged on the connecting pipe assembly. The shell is provided with a liquid inlet and a liquid outlet which are communicated with the solution cavity, and the two ends of the connecting pipe assembly are communicated with the liquid inlet and the liquid outlet respectively. The heat exchanger is arranged on the outer side of the shell, the heat source cannot be interfered by the heat exchanger in the mounting and dismounting process, dismounting and later maintenance are convenient, and normal work and the service life of the heat source can be prevented from being affected when the heat exchanger is damaged. The liquid pump can drive the cooling liquid to pass through the heat exchanger and flow back into the solution cavity after heat exchange with the heat exchanger, the overall temperature of the cooling liquid in the solution cavity can be reduced, and therefore the heat dissipation effect on the heat source is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration and heat dissipation, in particular to an immersion type heat dissipation system. Background Art

[0002] With the rapid development of new Internet technologies such as cloud computing and big data, the performance of servers is getting stronger and stronger. It is easy to generate a lot of heat during operation. In a high temperature environment, the performance and life of the server will be affected. Therefore, it is particularly important to dissipate heat for the server.

[0003] At present, servers usually use liquid cooling to dissipate heat. The current method is usually to immerse the server in coolant, and use the coolant to absorb the heat on the server, thereby reducing the temperature of the server. However, when the coolant is heated, a phase change reaction will occur, causing the internal pressure of the container containing the coolant to change, thereby affecting the airtightness of the container. In order to solve this problem, the current method is to set a condenser above the server. When the bubbles move to the top of the server, the coolant there exchanges heat with the condenser, making its temperature relatively low. Therefore, heat exchange will occur with the bubbles, and the bubbles will not escape from the liquid surface, thereby solving the problem of unstable internal pressure.

[0004] In the process of implementing the present invention, the utility model inventor discovered that there are at least the following problems in the prior art:

[0005] The condenser and server are both installed in the cabinet. The server installation and subsequent maintenance will be disturbed by the condenser, causing inconvenience. At the same time, the server and condenser are immersed in liquid, using pool boiling method, which is not very effective in cooling high-power components. Utility Model Content

[0006] In view of this, the utility model aims to provide an improved immersion heat dissipation system to solve the above problems.

[0007] An immersion heat dissipation system provided in the present application includes a shell provided with a solution cavity, a coolant located in the solution cavity, and a heat source immersed in the coolant. The immersion heat dissipation system also includes a heat exchanger located outside the shell, a connecting pipe assembly connected to the heat exchanger, and a liquid pump arranged on the connecting pipe assembly. The shell is provided with a liquid inlet and a liquid outlet connected to the solution cavity, and two ends of the connecting pipe assembly are respectively connected to the liquid inlet and the liquid outlet.

[0008] In some embodiments, the liquid level of the cooling liquid is less than the height of the solution cavity, and the solution cavity forms a vapor space above the cooling liquid.

[0009] In some embodiments, the liquid inlet is in communication with the vapor space.

[0010] In some embodiments, the shell is provided with a nozzle at the liquid inlet, the liquid spraying port of the nozzle faces into the steam space, and the nozzle is connected to the connecting pipe assembly.

[0011] In some embodiments, the nozzle is mounted on the top of the housing.

[0012] In some embodiments, the cooling liquid is a low boiling point saturated liquid;

[0013] The low-boiling-point saturated liquid absorbs the heat generated by the heat source in the solution cavity to undergo a first phase change, forming steam that fills the steam space;

[0014] The steam in the steam space exchanges heat with the coolant sprayed from the nozzle to cause a second phase change, forming a liquid coolant that fills the solution cavity.

[0015] In some embodiments, the coolant is a saturated liquid with a low boiling point, the liquid inlet is located above the liquid level of the coolant and spaced from the liquid level of the coolant, or the liquid inlet is located below the liquid level of the coolant and above the heat source;

[0016] The low-boiling-point saturated liquid absorbs heat generated by the heat source in the solution cavity, undergoes a first phase change, forms bubbles and moves toward the liquid surface;

[0017] The coolant after heat exchange in the heat exchanger is mixed with the coolant in the solution cavity and then exchanges heat with the bubbles between the liquid surface and the heat source to produce a second phase change, forming a liquid coolant filled in the solution cavity.

[0018] In some embodiments, the liquid outlet is disposed at the bottom of the shell, and the liquid pump is disposed at a position of the connecting pipe assembly close to the liquid outlet.

[0019] In some embodiments, the heat exchanger includes a condenser and a heat exchange medium located in the condenser. Driven by the liquid pump, the coolant can pass through the condenser and perform heat exchange with the heat exchange medium.

[0020] In some embodiments, the heat source is a server; and / or

[0021] The liquid level of the cooling liquid is higher than the heat source.

[0022] The immersion heat dissipation system provided by the utility model includes at least the following beneficial effects: by arranging the heat exchanger on the outside of the shell, the heat source can be prevented from being disturbed by the heat exchanger during the installation and removal process, which is convenient for disassembly and assembly and later maintenance. At the same time, the connecting pipe assembly is connected to the liquid inlet and the liquid outlet on the shell and is installed with a liquid pump. The liquid pump can provide power for the coolant, so that the coolant in the solution cavity enters the connecting pipe assembly from the liquid outlet, flows through the heat exchanger, and then flows into the solution cavity through the liquid inlet. The coolant can exchange heat with the heat exchanger when passing through the heat exchanger, and then flow back into the solution cavity after reducing the temperature, which can reduce the overall temperature of the coolant in the solution cavity, thereby improving the heat dissipation effect of the coolant on the heat source, and the liquid pump increases the disturbance of the coolant in the solution cavity, converts the traditional pool boiling into flow boiling, and makes it easier for the gas or bubbles generated on the surface of the heat source to detach, so as to further enhance the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of an immersion heat exchange system provided in one embodiment of the utility model;

[0024] Figure 2 A schematic structural diagram of an immersion heat exchange system provided in another embodiment of the utility model.

[0025] In the figure: 10, immersion cooling system; 12, solution cavity; 14, shell; 16, coolant; 18, heat source; 19, air bubble; 20, heat exchanger; 22, connecting pipe assembly; 24, liquid pump; 26, liquid inlet; 28, liquid outlet; 30, steam space; 32, nozzle; 34, droplet. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, inside, outside, top, bottom...) are only used to explain the relative position relationship between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, the element may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] like Figure 1 As shown, the utility model provides an immersion heat dissipation system 10, including a shell 14 provided with a solution cavity 12, a coolant 16 located in the shell 14, and a heat source 18 immersed in the coolant 16. The heat source 18 generates heat during operation. Since the heat source 18 is immersed in the coolant 16, the heat is transferred to the coolant 16, thereby reducing the temperature of the heat.

[0030] In this embodiment, the coolant 16 is a low-boiling point saturated liquid and has an insulating effect. After the heat source 18 transfers heat to the coolant 16, the coolant 16 will boil and generate bubbles 19. At the same time, since the coolant 16 has an insulating effect, it will not affect the operation of the heat source 18.

[0031] The heat source 18 refers to a device that generates heat during operation and needs to be cooled, such as a server. The server has high-power electronic devices such as CPU and GPU. The electronic devices continuously generate heat during operation, so that the low-boiling point saturated liquid undergoes phase change due to heat, and bubbles 19 are continuously generated on the surface of the electronic device to take away the heat on the surface of the electronic device, thereby reducing the overall temperature of the heat source 18.

[0032] It is understandable that the heat source 18 can be completely immersed in the coolant 16 or partially immersed in the coolant 16. In this embodiment, the liquid level of the coolant 16 is higher than the heat source 18, that is, the heat source 18 is completely immersed in the coolant 16 to enhance the cooling effect on the heat source 18.

[0033] In one embodiment, the immersion heat dissipation system 10 also includes a heat exchanger 20, a connecting pipe assembly 22 and a liquid pump 24. The heat exchanger 20 is located on the outside of the shell 14, so the heat source 18 will not be disturbed by the heat exchanger 20 during installation and removal, which is convenient for disassembly and subsequent maintenance, and can prevent the heat exchanger 20 from being damaged and affecting the normal operation and service life of the heat source 18.

[0034] The shell 14 is provided with a liquid inlet 26 and a liquid outlet 28 connected to the solution cavity 12, and both ends of the connecting pipe assembly 22 are respectively connected to the liquid inlet 26 and the liquid outlet 28. The heat exchanger 20 is connected to the connecting pipe assembly 22. The liquid pump 24 is arranged on the connecting pipe assembly 22 and is used to drive the coolant 16 in the solution cavity 12 to move from the liquid outlet 28 along the connecting pipe assembly 22 to the liquid inlet 26. After the heat source 18 transfers the heat it generates to the coolant 16, the overall temperature of the heat source 18 decreases, and the overall temperature of the coolant 16 increases. When the liquid pump 24 is working, it can provide power for the coolant 16, so that the coolant 16 in the solution cavity 12 enters the connecting pipe assembly 22 from the liquid outlet 28, and then moves toward the liquid inlet 26, and finally flows back into the solution cavity 12 from the liquid inlet 26. The coolant 16 passes through the heat exchanger 20 during the movement from the liquid outlet 28 to the liquid inlet 26, thereby exchanging heat with the heat exchanger 20 to form a supercooled coolant. After the temperature of the coolant 16 is reduced, it is allowed to flow back into the solution cavity 12, which can reduce the overall temperature of the coolant 16 in the solution cavity 12, thereby improving the heat dissipation effect of the coolant 16 on the heat source 18. In addition, the liquid pump 24 increases the disturbance of the coolant 16 in the solution cavity 12, converts the traditional pool boiling into flow boiling, and makes it easier for the gas or bubbles generated on the surface of the heat source 18 to detach, so as to further enhance the heat dissipation effect.

[0035] In this embodiment, the liquid outlet 28 is located at the bottom of the housing 14 , the liquid inlet 26 is located at the top of the housing 14 , and the liquid pump 24 is disposed at a position of the connecting pipe assembly 22 close to the liquid outlet 28 .

[0036] In one embodiment, the liquid level of the cooling liquid 16 is lower than the height of the solution cavity 12, so that a vapor space 30 is formed above the solution cavity 12. When the cooling liquid 16 boils under the action of the heat source 18, bubbles 19 are generated, and the bubbles 19 move upward, separate from the cooling liquid 16, and form vapor that fills the vapor space 30.

[0037] Specifically, the liquid inlet 26 is communicated with the steam space 30 , and the liquid inlet 26 is located above the steam space 30 .

[0038] like Figure 1As shown, in one embodiment, the shell 14 is provided with a nozzle 32 at the liquid inlet 26, the liquid spraying port of the nozzle 32 faces the steam space 30, and the nozzle 32 is connected to the connecting pipe assembly 22. The low-boiling point saturated liquid absorbs the heat generated by the heat source 18 in the solution cavity 12 to undergo a first phase change, forming steam that fills the steam space 30; the steam in the steam space 30 exchanges heat with the coolant 16 sprayed from the nozzle 32 to undergo a second phase change, forming liquid coolant 16 that fills the solution cavity 12. The coolant 16 after heat exchange in the heat exchanger 20 has a lower temperature, and when sprayed from the nozzle 32, it forms fine droplets 34 and contacts the steam in the steam space 30, so that the steam is cooled and condensed into liquid coolant 16, and finally mixed with the coolant 16 in the solution cavity 12. The phase change reaction of the cooling liquid 16 being heated to form bubbles 19, i.e. the first phase change, and the phase change reaction of the steam being cooled to form liquid cooling liquid 16, i.e. the second phase change, both occur in the solution cavity 12, which is conducive to maintaining the stability of the internal pressure of the shell 14 and avoiding the problem of the internal pressure of the shell 14 being unstable due to the phase change reaction, which affects the air tightness of the shell 14. By using the nozzle 32 to form a low-temperature cooling liquid spray, the cooling liquid spray is contacted with the steam in the steam space 30, which can increase the contact area with the steam, and the spray cooling has a better convective heat transfer coefficient and a stronger heat transfer capacity, which can greatly improve the condensation efficiency of the steam.

[0039] Specifically, the liquid inlet 26 is opened at the top of the housing 14 , so that the nozzle 32 is installed at the top of the housing 14 .

[0040] like Figure 2As shown, in another embodiment, the coolant 16 is a low-boiling point saturated liquid, and the liquid inlet 26 is located above the liquid surface of the coolant 16 and is spaced from the liquid surface of the coolant 16, that is, only a portion of the solution cavity 12 is filled with the coolant 16, and a space is formed above the coolant 16, and the liquid inlet 26 is connected to the space. The low-boiling point saturated liquid absorbs the heat generated by the heat source 16 in the solution cavity 12 to undergo a first phase change, forming bubbles 19 and moving toward the liquid surface; the coolant 16 after heat exchange in the heat exchanger 20 is mixed with the coolant 16 in the solution cavity 12, and then exchanges heat with the bubbles 19 between the liquid surface and the heat source 16 to undergo a second phase change, forming liquid coolant 16 filling the solution cavity 12. The coolant 16 cooled by the heat exchanger 20 enters the solution cavity 12 through the liquid inlet 26 and mixes with the coolant 16 in the solution cavity 12, so that a temperature difference is formed in the coolant 16. The coolant 16 in the top area is mixed with the coolant 16 after heat exchange by the heat exchanger 20, so that the overall temperature of the coolant 16 in the top area is relatively low, while the coolant 16 in the bottom area is in contact with the heat source 18, so the overall temperature is relatively high. When the bubbles 19 generated on the surface of the heat source 18 move upward to the top area of ​​the coolant 16, since the overall temperature of the top area is relatively low, the coolant 16 in the top area will exchange heat with the bubbles 19, so that the bubbles 19 will condense to form liquid coolant 16.

[0041] In other embodiments, the liquid inlet may be located between the liquid surface of the cooling liquid and the heat source, and in this case the solution cavity may be fully filled with the cooling liquid or may be partially filled with the cooling liquid.

[0042] The specific type of the heat exchanger 20 is not limited, as long as it can cool down the coolant 16 passing through the connecting pipe assembly 22. In this embodiment, the heat exchanger 20 includes a condenser and a heat exchange medium located in the condenser, including but not limited to cooling water, and the coolant 16 can pass through the condenser under the drive of the liquid pump 24 and perform heat exchange with the heat exchange medium. The condenser is not connected to the connecting pipe assembly 22, so even if the condenser leaks, the heat exchange medium inside the condenser will not enter the solution cavity 12 through the connecting pipe assembly 22 and affect the heat source 18.

[0043] Preferably, the heat exchanger 20 further includes a container, the condenser is housed inside the container, the connecting pipe assembly 22 includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe connects the liquid outlet 28 of the housing 14 with the container, the liquid outlet pipe connects the liquid inlet 26 of the housing 14 with the container, and the liquid pump 24 is installed on the liquid inlet pipe. When the liquid pump 24 is working, the coolant 16 in the solution cavity 12 enters the liquid inlet pipe through the liquid outlet 28, then enters the container along the liquid inlet pipe, flows through the condenser and then enters the liquid outlet pipe, and finally flows into the solution cavity 12 from the liquid inlet 26.

[0044] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An immersion heat dissipation system, comprising a housing having a solution cavity, a coolant in the solution cavity, and a heat source immersed in the coolant, characterized in that: The immersion heat dissipation system further comprises a heat exchanger located outside the shell, a connecting pipe assembly connected to the heat exchanger, and a liquid pump arranged on the connecting pipe assembly, the shell is provided with a liquid inlet and a liquid outlet connected to the solution cavity, and two ends of the connecting pipe assembly are respectively connected to the liquid inlet and the liquid outlet; The liquid level of the cooling liquid is lower than the height of the solution cavity, the solution cavity forms a steam space above the cooling liquid, and the liquid inlet is connected to the steam space; A nozzle connected to the connecting pipe assembly is arranged in the shell, and a liquid spraying port of the nozzle faces the steam space, so that the coolant sprayed from the nozzle can exchange heat with the steam in the steam space.

2. The immersion heat dissipation system according to claim 1, characterized in that: The shell is provided with the nozzle at the liquid inlet.

3. The immersion heat dissipation system according to claim 2, characterized in that: The nozzle is mounted on the top of the shell.

4. The immersion heat dissipation system according to claim 2, characterized in that: The coolant is a low boiling point saturated liquid; The low-boiling-point saturated liquid absorbs the heat generated by the heat source in the solution cavity to undergo a first phase change, forming steam that fills the steam space; The steam in the steam space exchanges heat with the coolant sprayed from the nozzle to cause a second phase change, forming a liquid coolant that fills the solution cavity.

5. The immersion heat dissipation system according to claim 1, characterized in that: The coolant is a saturated liquid with a low boiling point, and the liquid inlet is located above the liquid surface of the coolant and spaced apart from the liquid surface of the coolant; The low-boiling-point saturated liquid absorbs heat generated by the heat source in the solution cavity, undergoes a first phase change, forms bubbles and moves toward the liquid surface; The coolant after heat exchange in the heat exchanger is mixed with the coolant in the solution cavity and then exchanges heat with the bubbles between the liquid surface and the heat source to produce a second phase change, forming a liquid coolant filled in the solution cavity.

6. The immersion heat dissipation system according to any one of claims 1 to 5, characterized in that: The liquid outlet is arranged at the bottom of the shell, and the liquid pump is arranged at a position of the connecting pipe assembly close to the liquid outlet.

7. The immersion heat dissipation system according to any one of claims 1 to 5, characterized in that: The heat exchanger includes a condenser and a heat exchange medium located in the condenser. The coolant can pass through the condenser under the drive of the liquid pump and perform heat exchange with the heat exchange medium.

8. The immersion heat dissipation system according to any one of claims 1 to 5, characterized in that: The heat source is a server; and / or The liquid level of the cooling liquid is higher than the heat source.

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