Cold plate type galvanic corrosion protection system for liquid cooling

Abstract

The utility model relates to a cold plate type galvanic corrosion protection system for liquid cooling, which comprises a water supply pipe, N liquid cooling plates, a water return pipe and a liquid cooling CDU, and the liquid cooling CDU, the water supply pipe, the liquid cooling plates and the water return pipe form a cooling liquid circulation loop. The water supply pipe is provided with N water supply connectors sequentially distributed in the axial direction of the water supply pipe. The water return pipe is provided with N water return connectors sequentially distributed in the axial direction of the water return pipe. N is a positive integer; the liquid cooling plates are respectively connected with the water supply interfaces and the water return interfaces in one-to-one correspondence through branch pipelines; the branch pipelines are respectively connected with the water supply interface and the water return interface through pipe joints; auxiliary anode assemblies are arranged at the opening ends of the water supply pipe and the water return pipe respectively, and each auxiliary anode assembly comprises a switch valve, an auxiliary anode and an exhaust valve which are connected in sequence. According to the cold plate type galvanic corrosion protection system for liquid cooling, the auxiliary anode is arranged, galvanic corrosion is inhibited through the cathode protection technology, and the durability and stability of a liquid cooling system are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold plate liquid cooling, and particularly relates to an electric couple corrosion protection system for cold plate liquid cooling. Background Art

[0002] In a cold plate liquid cooling system, by installing a liquid cooling plate on server components (such as high-heat generating components like CPU and GPU), the server components conduct heat to the liquid cooling plate through heat conducting components, and then use the liquid circulation inside the liquid cooling plate to transfer the heat to a heat dissipation unit far from the server.

[0003] In the above cold plate liquid cooling system, the material of the liquid cooling plate is generally selected as copper or aluminum, the pipe joints are made of stainless steel or copper, the manifold is mostly made of stainless steel, the manifold branch hose is made of EPDM material, and the conventional system pipeline is generally made of stainless steel material; this may lead to the contact of more than two kinds of dissimilar metals in ethylene glycol / PG aqueous solution. Due to the potential difference at the liquid cooling plate, electric couple corrosion is likely to occur, resulting in the decline of system performance and the shortening of service life.

[0004] Traditional anti-corrosion methods such as coating and adding anti-corrosion agents, although can alleviate the corrosion problem to a certain extent, cannot completely solve it. Therefore, it is of great significance to develop an effective electric couple corrosion protection scheme. Content of the Utility Model

[0005] Based on the above-mentioned drawbacks and deficiencies existing in the prior art, one of the purposes of the present utility model is to at least solve one or more of the above problems existing in the prior art. In other words, one of the purposes of the present utility model is to provide an electric couple corrosion protection system for cold plate liquid cooling that meets one or more of the foregoing requirements.

[0006] In order to achieve the above-mentioned utility model purpose, the present utility model adopts the following technical solutions:

[0007] An electric couple corrosion protection system for cold plate liquid cooling includes a water supply pipe, N liquid cooling plates, a water return pipe, and a liquid cooling CDU. The liquid cooling CDU, the water supply pipe, the liquid cooling plates, and the water return pipe form a coolant circulation loop;

[0008] The water supply pipe has N water supply interfaces distributed in sequence along its axial direction, and the water return pipe has N water return interfaces distributed in sequence along its axial direction; N is a positive integer; the liquid cooling plates are respectively connected to the corresponding water supply interfaces and water return interfaces through branch pipelines; the branch pipelines are respectively connected to the water supply interfaces and water return interfaces through pipe joints;

[0009] Auxiliary anode assemblies are respectively arranged at the open ends of the water supply pipe and the water return pipe. The auxiliary anode assembly includes a switch valve, an auxiliary anode, and an exhaust valve connected in sequence.

[0010] As a preferred solution, the auxiliary anode is installed between the switching valve and the exhaust valve through a sleeve.

[0011] As a preferred solution, the auxiliary anode is an MMO anode or a graphite anode.

[0012] As a preferred solution, the liquid cooling plate is provided with a reference electrode for collecting the potential of the liquid cooling plate.

[0013] As a preferred solution, the reference electrode is located at the center or around the liquid cooling plate.

[0014] As a preferred solution, the galvanic corrosion protection system further includes a power supply and a controller. The power supply is electrically connected to the liquid cooling plate through the controller, and the controller is signal-connected to the reference electrode.

[0015] As a preferred solution, the DC current output range of the power supply is 0.01 - 1 A.

[0016] As a preferred solution, the auxiliary anode is a magnesium anode or a zinc anode.

[0017] As a preferred solution, the liquid cooling plate is fixed to the PCB board with a heating chip installed thereon through a buckle plate.

[0018] As a preferred solution, the buckle plate has several mounting holes, and a fixing member passes through the mounting holes and is fixed to the PCB board.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] The galvanic corrosion protection system for cold plate liquid cooling of the present utility model is provided with an auxiliary anode, and galvanic corrosion is inhibited through cathodic protection technology, thereby improving the durability and stability of the liquid cooling system. Description of the Drawings

[0021] Figure 1 is the framework diagram of the galvanic corrosion protection system for cold plate liquid cooling in Embodiment 1 of the present utility model;

[0022] Figure 2 is the structural schematic diagram of the auxiliary anode assembly in Embodiment 1 of the present utility model;

[0023] Figure 3 is the control logic diagram of the galvanic corrosion protection system for cold plate liquid cooling in Embodiment 1 of the present utility model;

[0024] Figure 4 is the structural schematic diagram of the buckle plate in Embodiment 1 of the present utility model;

[0025] Figure 5 is the installation structural schematic diagram of the buckle plate in Embodiment 1 of the present utility model. Detailed Embodiments

[0026] To more clearly illustrate the embodiments of the present utility model, the following will describe the specific implementation manners of the present utility model with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0027] Embodiment 1:

[0028] As Figure 1 shown, the galvanic corrosion protection system for cold plate liquid cooling in this embodiment includes a Manifold water supply pipe 1, six liquid cooling plates 2, a Manifold water return pipe 3, and a liquid cooling CDU 4. The liquid cooling CDU 4, the Manifold water supply pipe 1, the liquid cooling plates 2, and the Manifold water return pipe 3 form a coolant circulation loop;

[0029] Among them, the Manifold water supply pipe 1 has six water supply interfaces distributed in sequence along its axial direction, and the Manifold water return pipe 3 has six water return interfaces distributed in sequence along its axial direction; the number of water supply interfaces and water return interfaces is not limited to six, and the specific number can be adjusted according to the actual application scenario.

[0030] The liquid cooling plates are respectively connected to their corresponding water supply interfaces and water return interfaces through Manifold branch flexible hoses 5; the Manifold branch flexible hoses 5 are respectively connected to the water supply interfaces and water return interfaces through Manifold quick connectors 6.

[0031] Considering that the distance from the Manifold quick connector to the liquid cooling plate < 0.5 m, in this embodiment, titanium-based noble metal coated anodes (MMO anodes) are installed in the Manifold water supply pipe and the Manifold water return pipe to provide long-term stable electrochemical protection for the liquid cooling plates through current forced protection. Specifically, auxiliary anode assemblies 7 are respectively provided at the top open ends of the Manifold water supply pipe 1 and the Manifold water return pipe 3 in this embodiment.

[0032] As Figure 2 shown, the auxiliary anode assembly 7 includes a switch valve 71, an auxiliary anode 72, and an exhaust valve 73 connected in sequence. The auxiliary anode 72 can be installed without shutting down the machine after the switch valve 71 is closed. Among them, the auxiliary anode 72 is installed between the switch valve 71 and the exhaust valve 73 through a sleeve 74. A commonly used detachable sealing connection in the prior art can be adopted between the sleeve 74 and the auxiliary anode 72 to facilitate the installation and replacement of the auxiliary anode 72.

[0033] The auxiliary anode of this embodiment uses a titanium-based precious metal coated anode, namely, an MMO anode. The MMO anode is used as the auxiliary anode material, which has excellent electrochemical stability and durability. Under high current density, the MMO anode can provide long-term stable protection and significantly improve the corrosion resistance of the system. Compared with traditional magnesium or zinc anodes, it has higher efficiency and life. In addition, a graphite anode made of high-purity graphite material can also be selected.

[0034] like Figure 3 and Figure 4 As shown, the galvanic corrosion protection system of this embodiment also includes a power supply, a controller and a reference electrode. The reference electrode 8 is pasted and installed on the liquid cooling plate 2 to collect the potential of the liquid cooling plate. The reference electrode 8 is arranged at the center and around the liquid cooling plate 2. Among them, the power supply is electrically connected to the liquid cooling plate through the controller, and the controller is connected to the reference electrode signal. To provide current to the protective cathode (i.e., the liquid cooling plate), according to the connection requirements of the protective cathode and the power supply, select the appropriate wire type and specification, use conductive glue or other existing commonly used connection methods to connect the wire to the protective cathode and the power supply to ensure that the connection is firm and reliable.

[0035] The DC current output range of the power supply of this embodiment is 0.01~1A. The controller adjusts the output current of the power supply so that the liquid cooling plate is in a cathode state, thereby preventing galvanic corrosion. The specific current value needs to be adjusted according to the area of the liquid cooling plate, the corrosion environment and the system design parameters. The current within this range can ensure that the liquid cooling plate is in a good protection state, while avoiding excessive current causing excessive consumption of the anode or excessive power consumption. The controller should be able to automatically adjust the output current according to the real-time data provided by the reference electrode to ensure that the liquid cooling plate is always in the best protection state. Maximum current limit: In order to protect system components and prevent excessive electrolysis, a maximum current limit value is set, generally not exceeding 1A.

[0036] like Figure 4 and Figure 5 As shown, the middle part of the gusset plate 91 has a hollow structure to avoid the position of the liquid inlet and outlet 20 of the liquid cooling plate 2. The circumference of the gusset plate 91 has an arc-shaped concave structure, which optimizes the gusset plate structure, uses less materials and has low cost; the liquid cooling plate 2 is fixed to the PCB board 93 on which the heating chip 92 is installed through the gusset plate 91. Among them, the gusset plate 91 has a plurality of mounting holes 910, which are penetrated by bolts or screws and are threadedly connected and fixed with the PCB board 93, so that the liquid cooling plate 2 is buckled on the heating chip 92 to achieve heat dissipation of the heating chip 92.

[0037] The cold plate type liquid cooling galvanic corrosion protection system of this embodiment is composed of:

[0038] 1) Power supply: The power supply provides direct current, and the output current is adjusted by the controller to ensure that the liquid cooling plate (cathode) remains at a negative potential, thereby preventing its corrosion.

[0039] 2) Controller: The controller automatically adjusts the power supply output according to the feedback data to ensure that the potential of the cathode (liquid cooling plate) is always lower than that of the anode.

[0040] 3) Reference electrode: It monitors the potential change in the liquid cooling plate system in real time and provides feedback data to the controller.

[0041] 4) Auxiliary anode: The anode undergoes an oxidation reaction under the action of current to provide uniform protection.

[0042] Therefore, the galvanic corrosion protection system for cold plate liquid cooling in this embodiment provides direct current through the power supply. The range of the direct current output by the power supply is 0.01 A to 1 A. The controller adjusts the output current of the power supply according to the data monitored by the reference electrode to ensure that the potential of the cathode (liquid cooling plate) is always lower than that of the anode, keeping the cathode of the liquid cooling plate in a negative potential state to prevent its corrosion, effectively solving the galvanic corrosion problem in the liquid cooling plate system, and ensuring the long-term stable and efficient operation of the system.

[0043] Embodiment 2:

[0044] The difference between the galvanic corrosion protection system for cold plate liquid cooling in this embodiment and that in Embodiment 1 is as follows:

[0045] The auxiliary anode material can be selected as traditional magnesium or zinc anodes. In this way, in the cold plate liquid cooling system, the anode acts as a sacrificial anode, undergoes an oxidation reaction in the electrolyte solution (i.e., the coolant ethylene glycol / PG aqueous solution), releases electrons, and makes the protected metal (liquid cooling plate) become the cathode, thereby slowing down its corrosion rate, which is the cathodic protection method of sacrificial anode. With such a design, there is no need to apply current to the liquid cooling plate, that is, components such as the power supply and the controller are omitted, optimizing the system structure.

[0046] Other structures can refer to Embodiment 1.

[0047] The above is only a detailed description of the preferred embodiments and principles of the present invention. For those of ordinary skill in the art, based on the idea provided by the present invention, there will be changes in the specific implementation manners, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A thermocouple corrosion protection system for cold plate liquid cooling, characterized in that It includes a water supply pipe, N liquid cooling plates, a water return pipe and a liquid cooling CDU. The liquid cooling CDU, the water supply pipe, the liquid cooling plates and the water return pipe form a coolant circulation loop; The water supply pipe has N water supply interfaces distributed sequentially along its axial direction, and the water return pipe has N water return interfaces distributed sequentially along its axial direction; N is a positive integer; the liquid cooling plates are respectively connected to their corresponding water supply interfaces and water return interfaces through branch pipes; the branch pipes are respectively connected to the water supply interfaces and the water return interfaces through pipe connectors; Auxiliary anode assemblies are respectively provided at the open ends of the water supply pipe and the water return pipe. The auxiliary anode assembly includes a switching valve, an auxiliary anode and an exhaust valve connected in sequence.

2. The galvanic corrosion protection system according to claim 1, characterized in that The auxiliary anode is installed between the switching valve and the exhaust valve through a sleeve.

3. The galvanic corrosion protection system according to claim 2, wherein, The auxiliary anode is an MMO anode or a graphite anode.

4. The galvanic corrosion protection system according to claim 3, characterized in that, The liquid cooling plate is provided with a reference electrode for collecting the potential of the liquid cooling plate.

5. The galvanic corrosion protection system according to claim 4, wherein The reference electrode is located at the center or around the liquid cooling plate.

6. The galvanic corrosion protection system according to claim 4, characterized in that, It further includes a power supply and a controller. The power supply is electrically connected to the liquid cooling plate through the controller, and the controller is signal-connected to the reference electrode.

7. The galvanic corrosion protection system according to claim 6, wherein, The DC current output range of the power supply is 0.01 - 1A.

8. The galvanic corrosion protection system according to claim 1, wherein The auxiliary anode is a magnesium anode or a zinc anode.

9. The galvanic corrosion protection system according to any one of claims 1-8, characterized in that, The liquid cooling plate is fixed to the PCB board on which a heating chip is installed through a clamping plate.

10. The galvanic corrosion protection system according to claim 9, characterized in that, The clamping plate has several mounting holes, and the fixing parts pass through the mounting holes and are fixed to the PCB board.

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