Liquid chiller cabinet flow distribution test method

Abstract

This invention relates to the field of heat dissipation technology for electronic devices, aiming to solve the problem that existing technologies cannot accurately test the flow rate of the manifold in a liquid-cooled heat dissipation chassis. It provides a method for testing the flow distribution of a liquid-cooled chassis, comprising the following steps: S1: Designing a flow rate and differential pressure testing device to test the liquid-cooled module and determine whether it meets the requirements; S2: Designing a variable flow resistance liquid-cooled test card, constructing a flow rate-differential pressure calculation and testing model, inserting the variable flow resistance liquid-cooled test card into the flow rate and pressure testing device, and adjusting the variable flow resistance liquid-cooled test card to maintain a consistent pressure difference between the liquid-cooled module and its inlet and outlet ends at the rated flow rate; S3: Establishing the flow rate and differential pressure equation and plotting the flow rate and differential pressure curve; S4: Inserting the adjusted variable flow resistance liquid-cooled test card into the liquid-cooled chassis for testing, obtaining and analyzing the flow data based on the flow rate and differential pressure curve, and determining the uniformity of the flow distribution.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for electronic devices, and more specifically, to a method for testing the flow distribution of liquid-cooled chassis. Background Technology

[0002] Liquid cooling is commonly used in the heat dissipation of high-power and high-heat-flux-density electronic devices. Pluggable, through-type liquid-cooled chassis are widely used, with each slot's liquid cooling plate connected in parallel to the chassis's manifold. The flow channel design for each liquid cooling plate is identical, and the chassis's manifold typically employs an even flow distribution design for the parallel liquid cooling plates. When the flow rate into the liquid cooling plate does not meet the design requirements, the cooling capacity of the plate will significantly decrease, potentially causing the chip to malfunction. Therefore, it is necessary to test the uniformity of flow distribution in the manifold used for parallel liquid cooling plates within the through-type liquid-cooled chassis.

[0003] Each pluggable liquid-cooled plate is connected to the liquid-cooled chassis manifold via a pluggable water-cooling connector. The manifold requires 15-20 liquid-cooled plates to be connected in parallel. The assembly and connection method of the liquid-cooled chassis 18, liquid-cooled plate 19, and manifold 20 is as follows: Figure 1 As shown.

[0004] Because the pluggable water-cooled connector lacks a self-locking function, the general-purpose flow meter cannot be directly connected to the water distributor's tank for flow testing. It can only be connected to the water distributor after the flow meter is connected in series with the liquid cooling plate. However, the flow meter itself has flow resistance. After the liquid cooling plate connected in series with the flow meter is connected to the water distributor, it will change the flow resistance of the tank being tested, thereby changing the flow distribution of the water distributor. This makes it impossible to accurately measure the flow in the tank, resulting in distorted flow test results.

[0005] Therefore, it is necessary to accurately test the flow difference and absolute value of the liquid cooling plate in each slot of the liquid cooling chassis distributor under the condition of minimizing the disturbance to the flow distribution of the chassis under test, so as to avoid the chip overheating failure due to the reduced heat dissipation capacity of individual liquid cooling plates caused by uneven flow distribution. Summary of the Invention

[0006] The present invention aims to provide a liquid cooling chassis flow distribution test method to solve the problem that the uneven flow distribution of the slots in the water distributor of the through-type liquid cooling chassis in the prior art reduces the heat dissipation capacity of individual liquid cooling plates and may cause chip overheating and failure. However, it is currently impossible to accurately test the slot flow of the water distributor of the through-type liquid cooling chassis.

[0007] This invention is achieved using the following technical solution:

[0008] This invention provides a method for testing the flow distribution of a liquid-cooled chassis, comprising the following steps:

[0009] S1: Design a flow rate and differential pressure testing device to test each liquid cooling module sequentially using the flow rate and differential pressure testing device to obtain the pressure difference between the inlet and outlet of each liquid cooling module at the rated flow rate. Select a standard differential pressure based on the obtained differential pressure data. Determine whether the liquid cooling module meets the requirements based on the difference between the differential pressure corresponding to each liquid cooling module and the standard differential pressure, and replace the liquid cooling modules that do not meet the requirements.

[0010] S2: Design a variable flow resistance liquid cooling test card, construct a flow-pressure difference calculation and test model, insert the variable flow resistance liquid cooling test card into the flow and pressure test device, and adjust the variable flow resistance liquid cooling test card to keep the pressure difference between the liquid cooling plug and the liquid cooling plug inlet and outlet consistent under the rated flow of the liquid cooling plug.

[0011] S3: Adjust the flow rate, record the flow rate data and read the pressure values ​​of the two pressure test ends of the variable flow resistance liquid-cooled test card itself, calculate the pressure difference, establish the flow rate and pressure difference equation of the variable flow resistance liquid-cooled test card in this state, and draw the flow rate and pressure difference curve.

[0012] S4: Insert the adjusted variable flow resistance liquid cooling test card into the liquid cooling chamber for testing. Start the liquid cooling chamber and supply liquid at the rated flow rate. Read the pressure values ​​of the two pressure test terminals of the variable flow resistance liquid cooling test card and calculate the pressure difference. Obtain the corresponding flow rate according to the flow rate and pressure difference curve. Complete the test of all slots in the liquid cooling chamber in this way, analyze the flow data, and judge the uniformity of the flow distribution.

[0013] As a preferred technical solution:

[0014] The liquid cooling module uses a liquid cooling plate.

[0015] As a preferred technical solution:

[0016] Step S1 specifically includes:

[0017] S101: Calculate the rated flow rate that each liquid cooling module needs to be allocated based on the total flow rate of the liquid cooling chassis and the number of liquid cooling modules;

[0018] S102: Design a flow rate and differential pressure testing device to test each liquid cooling module in sequence and obtain the differential pressure between the inlet and outlet of each liquid cooling module at the rated flow rate.

[0019] S103: Select the standard pressure difference based on the pressure difference data obtained in step S102, and determine whether the liquid cooling module meets the requirements based on the difference between the pressure difference corresponding to each liquid cooling module and the standard pressure difference.

[0020] As a preferred technical solution:

[0021] The design flow rate and differential pressure testing device mentioned in step S102 specifically includes:

[0022] The flow and differential pressure testing device is designed as follows: it includes a base, a left guide rail plate, a right guide rail plate, an inlet connector, an outlet connector, pressure gauge 1, pressure gauge 2, a flow meter, and a hydraulic transmission device. The left and right guide rail plates are mounted opposite each other on the base, and the inlet and outlet connectors are also mounted opposite each other on the base. The inlet connector and the left guide rail plate are on the same side, and the outlet connector and the right guide rail plate are on the same side. Pressure gauge 1 is mounted on the inlet connector, and pressure gauge 2 is mounted on the outlet connector. One end of the inlet connector is connected to the flow meter and the hydraulic transmission device in sequence through a pipe. The other end of the inlet connector is used to connect to the inlet of the liquid cooling module, and one end of the outlet connector is used to connect to the outlet of the liquid cooling module. The other end of the outlet connector is connected to the outside.

[0023] As a preferred technical solution:

[0024] The hydraulic transmission device uses a gear pump.

[0025] As a preferred technical solution:

[0026] The step S102, which involves sequentially testing each liquid cooling module using a flow rate and differential pressure testing device to obtain the differential pressure between the inlet and outlet of each liquid cooling module at the rated flow rate, specifically includes:

[0027] Insert both ends of the liquid cooling insert into the left and right guide rails respectively. Connect the liquid cooling insert to the inlet and outlet connectors. Adjust the hydraulic transmission device until the flow rate reaches the rated flow rate required by the liquid cooling insert. Record the pressure values ​​of pressure gauge 1 and pressure gauge 2 at this time. Calculate and record the pressure difference between pressure gauge 1 and pressure gauge 2, i.e., the pressure difference P. 1-2 Following the steps described above, test the liquid cooling modules in other slots in sequence to obtain the pressure difference corresponding to each liquid cooling module.

[0028] As a preferred technical solution:

[0029] In step S103, the criterion for determining whether a liquid cooling module meets the requirements is: when the pressure difference corresponding to a certain liquid cooling module is equal to the standard pressure difference P... 标准 The absolute value of the difference | P 1-2 -P 标准 If the percentage is ≥10%, the liquid cooling component is considered to have blocked flow channels or poor solder joints and short circuits, and does not meet the requirements.

[0030] As a preferred technical solution:

[0031] Step S2 includes:

[0032] S201: The variable flow resistance liquid-cooled test card is designed as follows: including a flow channel plate, a pressure regulating valve, pressure test end one, pressure test end two, pressure gauge three, pressure gauge four, and a liquid-cooled connector; the flow channel plate has a flow channel inside, and a pressure regulating valve, pressure test end one, and pressure test end two are provided on one side of the flow channel plate. Pressure test end one is connected to pressure gauge three, pressure test end two is connected to pressure gauge four, and a liquid-cooled connector is provided on one side of the flow channel plate.

[0033] As a preferred technical solution:

[0034] In step S201, the length of the internal flow channel of the flow channel plate exceeds 60% of the length of the liquid cooling plug-in flow channel.

[0035] As a preferred technical solution:

[0036] Step S2 also includes:

[0037] S202: Constructing a flow-pressure differential calculation and testing model:

[0038]

[0039]

[0040] P 1-2 =P′ 1-2 ;

[0041] Among them, P 1-2 λ1 is the pressure difference between the inlet and outlet of the liquid cooling module, i.e., the difference between the pressure values ​​of pressure gauge 1 and pressure gauge 2 in step S1; ρ is the friction coefficient of the liquid cooling module; L1 is the flow channel length of the liquid cooling module; v1 is the average flow velocity of the flow channel cross-section of the liquid cooling module; D is the equivalent diameter of the flow channel; r is the serpentine bend radius; P′ 1-2 λ2 is the pressure difference between the inlet and outlet of the variable flow resistance liquid-cooled test card, which is the difference between the pressure values ​​of pressure gauge 1 and pressure gauge 2 in step S2. λ2 is the friction coefficient of the variable flow resistance liquid-cooled test card. L2 is the flow channel length of the variable flow resistance liquid-cooled test card. v2 is the flow velocity at the variable cross-section of the variable flow resistance liquid-cooled test card. ε is the resistance coefficient of the variable cross-section of the variable flow resistance liquid-cooled test card.

[0042] As a preferred technical solution:

[0043] Step S2 also includes:

[0044] S203: Insert the variable flow resistance liquid cooling test card into the flow and pressure test device, set the hydraulic transmission device to the original rated flow state, ensure that the output power of the hydraulic transmission device is consistent with that of the test in step S1, adjust the opening of the pressure regulating valve until the pressure values ​​of pressure gauge 1 and pressure gauge 2 are equal to the pressure values ​​of the liquid cooling plug-in test in step S1, and use fasteners to fix the opening of the pressure regulating valve.

[0045] As a preferred technical solution:

[0046] Step S3 specifically includes:

[0047] Adjust the hydraulic transmission device to ensure the flow rate covers ±15% of the rated flow rate of a single liquid-cooled module. Record the flow rate data, read the pressure values ​​from pressure gauges three and four, and calculate the pressure difference P′. 3-4 Establish the flow rate and pressure difference equations for the variable flow resistance liquid-cooled test card under this condition:

[0048]

[0049] Wherein, L2′ refers to the flow channel length between pressure test end one and pressure test end two;

[0050] And by measuring the flow rate and pressure difference P′ 3-4 The friction coefficient λ2 and the variable cross-section resistance coefficient ε′ of the variable flow resistance liquid-cooled test card were corrected, and the flow rate versus pressure difference curve was finally calculated and plotted.

[0051] As a preferred technical solution:

[0052] Step S4 specifically includes:

[0053] Remove the liquid cooling connector from the test slot of the liquid cooling unit, insert the variable flow resistance liquid cooling test card with the pressure regulating valve opening already fixed, start the liquid cooling unit, supply liquid at the rated flow rate, and after a period of stable operation, read the pressure values ​​of pressure gauge three and pressure gauge four, and calculate the difference. According to the flow rate and differential pressure curve in step S3, read the corresponding flow rate data V1, stop the liquid cooling supply, remove the variable flow resistance test card, and reinsert the original liquid cooling plug; test the next tank, repeat the above process until all tanks are tested, and obtain the differential pressure of each tank. With corresponding flow rates V1~V n Compare whether the flow difference between any two slots exceeds 10%. If none of them exceed 10%, it indicates that the flow distribution is relatively uniform. If it exceeds 10%, the distributor needs to be redesigned.

[0054] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0055] 1. This invention can quickly determine whether there is flow channel blockage or poor soldering short circuit in liquid cooling components through flow and differential pressure testing device, avoiding uneven flow distribution in liquid cooling chassis due to individual board differences;

[0056] 2. This invention designs a variable flow resistance liquid-cooled test card with linearly adjustable differential pressure, so as to make the pressure loss of the test card and the liquid-cooled plug under test consistent within the rated flow range, thereby avoiding the disturbance of flow distribution after the flow test device is connected to the liquid-cooled chassis and ensuring test accuracy.

[0057] 3. This invention establishes a flow rate and pressure difference equation, uses test calibration equation parameters, and constructs a flow rate and pressure difference curve. The flow rate data of each tank can be quickly obtained using only the pressure difference, thereby directly determining the uniformity of the flow distribution of the water distributor.

[0058] 4. This invention enables the testing of flow rates in different slots without affecting the pressure at the flow nodes of the liquid cooling chassis. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of a through-type liquid-cooled chassis.

[0060] Figure 2 The flowchart of the liquid cooling chassis flow distribution test method described in this invention Figure 1 .

[0061] Figure 3 The flowchart of the liquid cooling chassis flow distribution test method described in this invention Figure 2 .

[0062] Figure 4 This is a schematic diagram of the flow rate and differential pressure testing device described in this invention.

[0063] Figure 5 This is a schematic diagram of the variable flow resistance liquid-cooled test card described in this invention.

[0064] Figure 6 This is a schematic diagram of the structure for inserting a variable flow resistance liquid-cooled test card into a flow rate and differential pressure testing device.

[0065] Figure 7 The graph shows the flow rate versus pressure difference near the rated flow point for the liquid-cooled plate and the variable flow resistance liquid-cooled test card.

[0066] Figure 8 This is the flow rate versus pressure differential curve described in this invention.

[0067] Figure 9 This is a schematic diagram of inserting a variable flow resistance liquid-cooled test card into a liquid-cooled chassis.

[0068] Icons: 1-Base, 2-Left guide rail plate, 3-Right guide rail plate, 4-Inlet connector, 5-Outlet connector, 6-Pressure gauge 1, 7-Pressure gauge 2, 8-Flow meter, 9-Gear pump, 10-Flow channel plate, 11-Pressure regulating valve, 12-Pressure test end 1, 13-Pressure test end 2, 14-Pressure gauge 3, 15-Pressure gauge 4, 16-Liquid cooling connector, 17-Variable flow resistance liquid cooling test card. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0070] Example 1

[0071] This embodiment is for Figure 1 The test panel for the through-type liquid-cooled chassis was used to determine the uniformity of flow distribution across multiple parallel liquid-cooled plates via its distributor, as well as the specific flow distribution values ​​for each tank. A variable flow resistance liquid-cooled test chart was employed for differential pressure testing. Using the flow-pressure equation and calibration method, a flow-pressure curve was constructed based on the parameters of the calibration equation. The flow rate was then read from the curve according to the pressure difference. Ultimately, this method accurately measures the flow differences and absolute flow data of each parallel liquid-cooled plate while minimizing disturbances to the flow distribution of the chassis under test.

[0072] like Figure 2 and Figure 3 As shown in the figure, this embodiment proposes a method for testing the flow distribution of a liquid-cooled chassis, including the following steps:

[0073] S1: Design a flow rate and differential pressure testing device to test each liquid cooling plate sequentially using the flow rate and differential pressure testing device to obtain the pressure difference between the inlet and outlet of each liquid cooling plate at the rated flow rate. Select a standard differential pressure based on the obtained differential pressure data. Determine whether the liquid cooling plate meets the requirements based on the difference between the differential pressure corresponding to each liquid cooling plate and the standard differential pressure, and replace the liquid cooling plates that do not meet the requirements.

[0074] Step S1 specifically includes:

[0075] S101: Calculate the rated flow rate that each liquid cooling plate needs to be allocated based on the total flow rate of the liquid cooling chassis and the number of liquid cooling plates. The rated flow rate is the total flow rate divided by the number of liquid cooling plates.

[0076] S102: Each liquid cooling plate is tested sequentially using a flow rate and differential pressure testing device; such as Figure 4As shown, the flow and differential pressure testing device includes a base 1, a left guide rail plate 2, a right guide rail plate 3, an inlet connector 4, an outlet connector 5, a pressure gauge 1 6, a pressure gauge 2 7, a flow meter 8, and a gear pump 9. The left guide rail plate 2 and the right guide rail plate 3 are mounted opposite each other on the base 1. The inlet connector 4 and the outlet connector 5 are also mounted opposite each other on the base 1. The inlet connector 4 and the left guide rail plate 2 are on the same side, and the outlet connector 5 and the right guide rail plate 3 are on the same side. The pressure gauge 1 6 is mounted on the inlet connector 4, and the pressure gauge 2 7 is mounted on the outlet connector 5. One end of the inlet connector 4 is connected to the flow meter 8 and the gear pump 9 in sequence through a pipe. The other end of the inlet connector 4 is used to connect to the inlet of the liquid cooling plate. One end of the outlet connector 5 is used to connect to the outlet of the liquid cooling plate, and the other end of the outlet connector 5 is connected to the outside.

[0077] Insert both ends of the liquid cooling plate into the left guide rail 2 and the right guide rail 3 respectively. Connect the liquid cooling plate to the inlet connector 4 and the outlet connector 5. Adjust the speed of the gear pump 9 until the flow meter 8 reaches the rated flow rate required by the liquid cooling plate. Record the pressure values ​​of pressure gauge 6 and pressure gauge 7 at this time. Calculate and record the pressure difference between pressure gauge 6 and pressure gauge 7, i.e., the pressure difference P. 1-2 Following the steps described above, test the liquid cooling plates in other tanks in sequence to obtain the pressure difference corresponding to each liquid cooling plate.

[0078] S103: After completing the test, select three liquid cooling plates with relatively similar pressure differences, and take the average pressure difference of these three liquid cooling plates as the standard pressure difference P. 标准 When the absolute value of the difference between the pressure differential of a certain liquid cooling plate and the standard pressure differential is |P 1-2 -P 标准 If the percentage is ≥10%, the liquid cooling plate is considered to have a blocked flow channel or a short circuit due to poor soldering, and therefore does not meet the requirements. Thus, the liquid cooling plate in the tested slot needs to be replaced. This method is used to determine and replace all liquid cooling plates in the liquid cooling chassis until all liquid cooling plates meet the requirements.

[0079] S2: Design a variable flow resistance liquid cooling test card, construct a flow rate-pressure difference calculation and test model, insert the variable flow resistance liquid cooling test card into the flow rate and pressure test device, and adjust the variable flow resistance liquid cooling test card to keep the pressure difference between the liquid cooling plate and the liquid cooling plate inlet and outlet ends consistent under the rated flow rate of the liquid cooling plate.

[0080] Step S2 specifically includes:

[0081] S201: To avoid the flow test device (such as a flow meter) changing the pressure of the original tank after being connected to the liquid cooling box, thus affecting the flow distribution of the water distributor, a variable flow resistance liquid cooling test card is adopted to ensure that the pressure difference between the variable flow resistance liquid cooling test card and the liquid cooling plate that meets the requirements in step S1 is basically consistent within the rated flow range. First, the variable flow resistance liquid cooling test card is designed.

[0082] like Figure 5 As shown, the variable flow resistance liquid-cooled test card includes a flow channel plate 10, a pressure regulating valve 11, a pressure test end 12, a pressure test end 2 13, a pressure gauge 3 14, a pressure gauge 4 15, and a liquid-cooled connector 16. The flow channel plate 10 is provided with a pressure regulating valve 11, a pressure test end 12, and a pressure test end 2 13 on one side. The pressure test end 12 is connected to the pressure gauge 3 14, and the pressure test end 2 13 is connected to the pressure gauge 4 15. The pressure regulating valve 11 can change the local cross-sectional area of ​​the flow channel in the flow channel plate 10. The flow channel plate 10 is provided with a liquid-cooled connector 16 on one side.

[0083] By adjusting the opening of the pressure regulating valve 11, the local pressure loss value is increased to compensate for the insufficient pressure loss along the friction distance of the variable flow resistance liquid-cooled test card. This ensures that the pressure loss values ​​of the variable flow resistance liquid-cooled test card and the liquid-cooled plate are close within a small fluctuation range at the rated flow point, thus guaranteeing that the pressure difference between the variable flow resistance liquid-cooled test card and the liquid-cooled plate is close within the same range. A flow-pressure difference calculation and testing model is then constructed.

[0084]

[0085]

[0086] P 1-2 =P1' -2 ;

[0087] Among them, P 1-2 λ1 is the pressure difference between the inlet and outlet of the liquid-cooled plate, i.e., the difference between the pressure values ​​of pressure gauge 6 and pressure gauge 7 in step S1; ρ is the friction coefficient of the liquid-cooled plate; L1 is the length of the liquid-cooled plate flow channel; v1 is the average flow velocity of the liquid-cooled plate flow channel cross-section; D is the equivalent diameter of the flow channel; r is the radius of the serpentine bend; and P′ is the pressure difference between the inlet and outlet of the liquid-cooled plate. 1-2 λ2 is the pressure difference between the inlet and outlet of the variable flow resistance liquid cooling test card, that is, the difference between the pressure values ​​of pressure gauge 6 and pressure gauge 7 in step S2; λ2 is the friction coefficient of the variable flow resistance liquid cooling test card; L2 is the flow channel length of the variable flow resistance liquid cooling test card; v2 is the flow velocity at the variable cross-section of the variable flow resistance liquid cooling test card; ε is the variable cross-section resistance coefficient of the variable flow resistance liquid cooling test card.

[0088] Since liquid cooling plates typically have a serpentine flow channel inside, and the flow resistance consists of friction resistance and variable cross-section local resistance, to ensure that the pressure difference between the variable flow resistance liquid cooling test card and the liquid cooling plate is close within a small fluctuation range at the rated flow point, the length of the serpentine flow channel inside the flow channel plate 10 of the variable flow resistance liquid cooling test card exceeds 60% of the length of the liquid cooling plate's flow channel. Figure 7 The flow rate versus pressure difference curves of the liquid-cooled plate and the variable flow resistance liquid-cooled test card near the rated flow point are presented.

[0089] S202: Insert the variable flow resistance liquid-cooled test card into the flow and pressure testing device, such as... Figure 6 As shown, the speed of gear pump 9 is set to the speed at the original rated flow rate to ensure that the output power of gear pump 9 is consistent with that of the test in step S1. The opening of pressure regulating valve 11 is adjusted so that the pressure values ​​of pressure gauge 6 and pressure gauge 7 are equal to the pressure values ​​of the liquid cooling plate in step S1 (error ≤ 3%). Fasteners are used to fix the opening of pressure regulating valve 11.

[0090] S3: Adjust the flow rate, record the flow rate data and read the pressure values ​​of the two pressure test ends of the variable flow resistance liquid-cooled test card itself, calculate the pressure difference, establish the flow rate and pressure difference equation of the variable flow resistance liquid-cooled test card in this state, and draw the flow rate and pressure difference curve.

[0091] Step S3 specifically includes:

[0092] Adjust the speed of gear pump 9, setting 4 to 6 speed points to ensure the flow rate covers ±15% of the rated flow rate of a single liquid cooling plate. Record the flow data, read the pressure values ​​from pressure gauges 3-14 and 4-15, and calculate the pressure difference P′. 3-4 Establish the flow rate and pressure difference equations for the variable flow resistance liquid-cooled test card under this condition:

[0093]

[0094] Wherein, L2′ refers to the flow channel length between pressure test end one and pressure test end two;

[0095] And by measuring the flow rate and pressure difference P′ 3-4 The friction coefficient λ2 and the variable cross-section resistance coefficient ε′ of the variable flow resistance liquid-cooled test card were corrected, and the flow rate versus pressure difference curve was finally calculated and plotted, as shown in the figure. Figure 8 As shown.

[0096] S4: Insert the adjusted variable flow resistance liquid cooling test card into the liquid cooling box for testing. Start the liquid cooling box and supply liquid at the rated flow rate. Read the pressure values ​​of the two pressure test ends of the variable flow resistance liquid cooling test card and calculate the pressure difference. Obtain the corresponding flow rate according to the flow rate and pressure difference curve. Complete the test of all slots in the liquid cooling box in this way, analyze the flow data, and judge the flow distribution uniformity.

[0097] Step S4 specifically includes:

[0098] like Figure 9 As shown, remove the liquid cooling plate from the test slot of the liquid cooling unit, insert the variable flow resistance liquid cooling test card 17 with the pressure regulating valve opening fixed, start the liquid cooling unit, supply liquid at the rated flow rate, and after stable operation for a period of time, read the pressure values ​​of pressure gauge 14 and pressure gauge 15, and calculate the difference. according to Figure 8 Read the corresponding flow rate data V1, stop the liquid cooling supply, remove the variable flow resistance test card, and reinsert the original liquid cooling plate; test the next tank, repeating the above process until all tanks are tested, and obtain the pressure difference of each tank. With corresponding flow rates V1~V n Compare whether the flow difference between any two slots exceeds 10%. If none of them exceed 10%, it indicates that the flow distribution is relatively uniform. If it exceeds 10%, the distributor needs to be redesigned.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing flow distribution in a liquid-cooled chassis, characterized in that: Includes the following steps: S1: Design a flow rate and differential pressure testing device to test each liquid cooling module sequentially using the flow rate and differential pressure testing device to obtain the pressure difference between the inlet and outlet of each liquid cooling module at the rated flow rate. Select a standard differential pressure based on the obtained differential pressure data. Determine whether the liquid cooling module meets the requirements based on the difference between the differential pressure corresponding to each liquid cooling module and the standard differential pressure, and replace the liquid cooling modules that do not meet the requirements. S2: Design a variable flow resistance liquid cooling test card, construct a flow-pressure difference calculation and test model, insert the variable flow resistance liquid cooling test card into the flow and pressure test device, and adjust the variable flow resistance liquid cooling test card to keep the pressure difference between the liquid cooling plug and the liquid cooling plug inlet and outlet consistent under the rated flow of the liquid cooling plug. S3: Adjust the flow rate, record the flow rate data and read the pressure values ​​of the two pressure test ends of the variable flow resistance liquid-cooled test card itself, calculate the pressure difference, establish the flow rate and pressure difference equation of the variable flow resistance liquid-cooled test card in this state, and draw the flow rate and pressure difference curve. S4: Insert the adjusted variable flow resistance liquid cooling test card into the liquid cooling chamber for testing. Start the liquid cooling chamber and supply liquid at the rated flow rate. Read the pressure values ​​of the two pressure test terminals of the variable flow resistance liquid cooling test card and calculate the pressure difference. Obtain the corresponding flow rate according to the flow rate and pressure difference curve. Complete the test of all slots in the liquid cooling chamber in this way, analyze the flow data, and judge the uniformity of the flow distribution.

2. The liquid-cooled chassis flow distribution test method according to claim 1, characterized in that: Step S1 specifically includes: S101: Calculate the rated flow rate that each liquid cooling module needs to be allocated based on the total flow rate of the liquid cooling chassis and the number of liquid cooling modules; S102: Design a flow rate and differential pressure testing device to test each liquid cooling module in sequence and obtain the differential pressure between the inlet and outlet of each liquid cooling module at the rated flow rate. S103: Select the standard pressure difference based on the pressure difference data obtained in step S102, and determine whether the liquid cooling module meets the requirements based on the difference between the pressure difference corresponding to each liquid cooling module and the standard pressure difference.

3. The liquid cooling chassis flow distribution test method according to claim 2, characterized in that: The design flow rate and differential pressure testing device mentioned in step S102 specifically includes: The flow and differential pressure testing device is designed as follows: it includes a base, a left guide rail plate, a right guide rail plate, an inlet connector, an outlet connector, pressure gauge 1, pressure gauge 2, a flow meter, and a hydraulic transmission device. The left and right guide rail plates are mounted opposite each other on the base, and the inlet and outlet connectors are also mounted opposite each other on the base. The inlet connector and the left guide rail plate are on the same side, and the outlet connector and the right guide rail plate are on the same side. Pressure gauge 1 is mounted on the inlet connector, and pressure gauge 2 is mounted on the outlet connector. One end of the inlet connector is connected to the flow meter and the hydraulic transmission device in sequence through a pipe. The other end of the inlet connector is used to connect to the inlet of the liquid cooling module, and one end of the outlet connector is used to connect to the outlet of the liquid cooling module. The other end of the outlet connector is connected to the outside.

4. The liquid-cooled chassis flow distribution test method according to claim 3, characterized in that: The step S102, which involves sequentially testing each liquid cooling module using a flow rate and differential pressure testing device to obtain the differential pressure between the inlet and outlet of each liquid cooling module at the rated flow rate, specifically includes: Insert both ends of the liquid cooling insert into the left and right guide rails respectively. Connect the liquid cooling insert to the inlet and outlet connectors. Adjust the hydraulic transmission device until the flow rate reaches the rated flow rate required by the liquid cooling insert. Record the pressure values ​​of pressure gauge 1 and pressure gauge 2 at this time. Calculate and record the pressure difference between pressure gauge 1 and pressure gauge 2, i.e., the pressure difference P. 1-2 Following the steps described above, test the liquid cooling modules in other slots in sequence to obtain the pressure difference corresponding to each liquid cooling module.

5. The liquid cooling chassis flow distribution test method according to claim 4, characterized in that: In step S103, the criterion for determining whether a liquid cooling module meets the requirements is: when the pressure difference corresponding to a certain liquid cooling module is equal to the standard pressure difference P... 标准 The absolute value of the difference | P 1-2 -P 标准 If the percentage is ≥10%, the liquid cooling component is considered to have blocked flow channels or poor solder joints and short circuits, and does not meet the requirements.

6. The liquid-cooled chassis flow distribution test method according to claim 4, characterized in that: Step S2 includes: S201: The variable flow resistance liquid-cooled test card is designed as follows: including a flow channel plate, a pressure regulating valve, pressure test end one, pressure test end two, pressure gauge three, pressure gauge four, and a liquid-cooled connector; the flow channel plate has a flow channel inside, and a pressure regulating valve, pressure test end one, and pressure test end two are provided on one side of the flow channel plate. Pressure test end one is connected to pressure gauge three, pressure test end two is connected to pressure gauge four, and a liquid-cooled connector is provided on one side of the flow channel plate.

7. The liquid-cooled chassis flow distribution test method according to claim 6, characterized in that: Step S2 also includes: S202: Constructing a flow-pressure differential calculation and testing model: P 1-2 =P′ 1-2 ; Among them, P 1-2 λ1 is the pressure difference between the inlet and outlet of the liquid cooling module, i.e., the difference between the pressure values ​​of pressure gauge 1 and pressure gauge 2 in step S1; ρ is the friction coefficient of the liquid cooling module; L1 is the flow channel length of the liquid cooling module; v1 is the average flow velocity of the flow channel cross-section of the liquid cooling module; D is the equivalent diameter of the flow channel; r is the serpentine bend radius; P′ 1-2 λ2 is the pressure difference between the inlet and outlet of the variable flow resistance liquid-cooled test card, which is the difference between the pressure values ​​of pressure gauge 1 and pressure gauge 2 in step S2. λ2 is the friction coefficient of the variable flow resistance liquid-cooled test card. L2 is the flow channel length of the variable flow resistance liquid-cooled test card. v2 is the flow velocity at the variable cross-section of the variable flow resistance liquid-cooled test card. ε is the resistance coefficient of the variable cross-section of the variable flow resistance liquid-cooled test card.

8. The liquid-cooled chassis flow distribution test method according to claim 7, characterized in that: Step S2 also includes: S203: Insert the variable flow resistance liquid cooling test card into the flow and pressure test device, set the hydraulic transmission device to the original rated flow state, ensure that the output power of the hydraulic transmission device is consistent with that of the test in step S1, adjust the opening of the pressure regulating valve until the pressure values ​​of pressure gauge 1 and pressure gauge 2 are equal to the pressure values ​​of the liquid cooling plug-in test in step S1, and use fasteners to fix the opening of the pressure regulating valve.

9. The liquid-cooled chassis flow distribution test method according to claim 8, characterized in that: Step S3 specifically includes: Adjust the hydraulic transmission device to ensure the flow rate covers ±15% of the rated flow rate of a single liquid-cooled module. Record the flow rate data, read the pressure values ​​from pressure gauges three and four, and calculate the pressure difference P′. 3-4 Establish the flow rate and pressure difference equations for the variable flow resistance liquid-cooled test card under this condition: Wherein, L2′ refers to the flow channel length between pressure test end one and pressure test end two; And by measuring the flow rate and pressure difference P′ 3-4 The friction coefficient λ2 and the variable cross-section resistance coefficient ε′ of the variable flow resistance liquid-cooled test card were corrected, and the flow rate versus pressure difference curve was finally calculated and plotted.

10. The liquid-cooled chassis flow distribution test method according to claim 9, characterized in that: Step S4 specifically includes: Remove the liquid cooling connector from the test slot of the liquid cooling unit, insert the variable flow resistance liquid cooling test card with the pressure regulating valve opening already fixed, start the liquid cooling unit, supply liquid at the rated flow rate, and after a period of stable operation, read the pressure values ​​of pressure gauge three and pressure gauge four, and calculate the difference. According to the flow rate and differential pressure curve in step S3, read the corresponding flow rate data V1, stop the liquid cooling supply, remove the variable flow resistance test card, and reinsert the original liquid cooling plug; test the next tank, repeat the above process until all tanks are tested, and obtain the differential pressure of each tank. With corresponding flow rates V1~V n Compare whether the flow difference between any two slots exceeds 10%. If none of them exceed 10%, it indicates that the flow distribution is relatively uniform. If it exceeds 10%, the distributor needs to be redesigned.

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