Apparatus and method for multi-leg flow testing

Abstract

The application provides a device and method for multi-branch flow test, wherein the device comprises a quick connector component, a connecting pipe and a flow measuring device, the quick connector component is detachably arranged at two ends of the connecting pipe, and the flow measuring device is arranged on the connecting pipe. The device is simple and easy to install and test, and the real flow of the branch can be obtained by cooperating with a correction algorithm of the total inlet and outlet pressure value, so that the flow test error caused by the change of the flow resistance characteristics of the branch due to the connection of the flow test device is avoided, and the real flow of each branch in the running process can be obtained without designing and installing a flow meter on the branch of the multi-branch cooling system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow test of multi-branch cooling system, and particularly relates to a device and method for multi-branch flow test. BACKGROUND

[0002] In the design of the existing cooling system of high-power power electronic devices, the efficiency of the liquid cooling mode is higher, and the power density can also meet the existing device requirements. Therefore, liquid cooling as a common and efficient cooling method is applied more and more in the cooling of the existing high-power power electronic devices. Liquid cooling relies on the flow of the cooling medium in the heat sink channel to take away the heat of the power electronic device, so as to realize the heat transfer process. The cooling capacity of liquid cooling is mainly determined by the size of the cooling medium flow. For a multi-branch cooling system, generally only one flow meter is arranged on the main road to monitor the total flow of the entire cooling system. However, for the design of the multi-branch cooling system, it is impossible to determine whether the flow of each branch meets the design requirements and to know the flow of each branch of the multi-branch cooling system at the present stage. Generally, flow meters are designed and installed on the branches at the beginning of the design, which greatly increases the design cost of the cooling system. Therefore, a test method is needed to accurately obtain the branch flow. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a device and method for multi-branch flow test. The flow test device is simple, easy to install and test, and can obtain the real flow of the branch by correcting the inlet and outlet pressure values of the total road, avoid the change of the flow resistance characteristics of the branch caused by the connection of the flow test device, and thus avoid the flow test error, so that the real flow of each branch in the running process can be obtained without designing and installing flow meters on the branches of the multi-branch cooling system.

[0004] To solve the above technical problems, the technical solution provided by the present application is as follows:

[0005] A device for multi-branch flow test, comprising a quick connector component, a connecting pipe and a flow measuring device, wherein the quick connector is arranged at both ends of the connecting pipe in a detachable manner, and the flow measuring device is arranged on the connecting pipe.

[0006] The device for multi-branch flow test according to the present application has the advantages of simple structure, light weight and easy portability. Since the quick connector component is arranged in a detachable manner, it is easy to install and test.

[0007] For the above technical solution, further improvements can be made as follows.

[0008] According to the device for multi-branch flow test of the present application, in a preferred embodiment, the connecting pipe comprises two groups of hoses, a flow measuring device is arranged between the two groups of hoses, and quick coupling components are arranged on the hoses respectively at the ends away from the flow measuring device.

[0009] The use of hoses makes it easier to reduce the weight of the entire test device and facilitate carrying.

[0010] Further, in a preferred embodiment, a straight pipe section is arranged between the two groups of hoses, and a flow measuring device is arranged between the straight pipe section and one of the groups of hoses.

[0011] The addition of the straight pipe section facilitates the arrangement of the flow measuring device such as a flow meter and increases the convenience of installation of the test.

[0012] Specifically, in a preferred embodiment, the two ends of the hose are connected with the threaded joints through the clamps.

[0013] The use of the clamps and the threaded joints further increases the convenience of installation of the entire device.

[0014] Further, in a preferred embodiment, the flow measuring device comprises a flow meter.

[0015] The use of the flow meter to measure the flow makes the entire device simple in structure, easy to arrange and install, and the measurement result is intuitive and accurate.

[0016] The method for multi-branch flow test of the second aspect of the present application comprises the following steps:

[0017] S01, the quick coupling components in the device are removed, and the quick coupling components are connected to the branches of the cooling system, and the pressure drop ΔP of the quick coupling components under different flow conditions is measured k ;

[0018] S02, the part of the device after the removal of the quick coupling components is connected to the branches of the cooling system, and the pressure drop ΔP of the device without the quick coupling components under different flow conditions is measured l ;

[0019]

[0020]

[0021] wherein: ε k is the inertial resistance coefficient of the quick coupling components, ε k ' is the viscous resistance coefficient of the quick coupling components, ε l is the inertial resistance coefficient of the device without the quick coupling components, and ε l' is the viscous resistance coefficient of the device without the quick connector, ρ is the density of the cooling medium, V c To test the flow rate of the branch;

[0022] S03, ΔP is obtained by fitting the experimental data k , ΔP l With V c The relationship between

[0023] ΔP k =mV c 2 +nV c ;ΔP l =aV c 2 +bV c ;

[0024] Calculate the inertial resistance coefficient ε of the quick connector components respectively k , viscous resistance coefficient ε k ', inertial resistance coefficient ε of the device without quick connector l , viscous resistance coefficient ε l '

[0025]

[0026] S04. Measure the pressure drop ΔP caused by the test branch of the cooling system when the above-mentioned device is not added;

[0027] Measure the pressure drop ΔP1 caused by adding the above-mentioned device to the test branch of the cooling system;

[0028] Disconnect a branch other than the test branch in the cooling system, and change the pressure drop ΔP2 caused by adding the above-mentioned device to the test branch of the measuring cooling system;

[0029] The inertial resistance coefficient ε, viscous resistance coefficient ε′ and flow rate V of the test branch in the cooling system without the above-mentioned device can be obtained through ΔP, ΔP1 and ΔP2 c .

[0030] According to the method for multi-branch flow testing of an embodiment of the present invention, since different quick connectors are often used to balance the resistance of each branch during the design process of the cooling system, the types of quick connectors used on the branches are different. In order to make the resistance characteristics of the flow test tool more accurate, a quick connector resistance coefficient test method and a flow test device (excluding the quick connector end) resistance coefficient test method are set. During the test, the pressure drop ΔP of the quick connector under different flow conditions is measured in sequence. k Pressure drop ΔP of the flow test device (excluding the quick connector end) under different flow conditions lThe pressure-flow correction algorithm can effectively eliminate the change of pipeline flow resistance characteristics caused by the introduction of the flow meter, so that the branch flow of the cooling system without connecting the flow meter can be accurately obtained, the flow measurement device and the pressure-flow correction algorithm are effectively associated, and the testing process in the case of multiple branches of the cooling system is simplified, therefore, the device and method for multi-branch flow testing can effectively obtain the accurate flow value of each branch of the cooling system in actual operation through simple testing, and the real flow of each branch in the running process can be obtained through testing without designing and installing the flow meter on the branch of the multi-branch cooling system.

[0031] Specifically, in a preferred embodiment, in step S04,

[0032]

[0033]

[0034]

[0035] Specifically, in a preferred embodiment, the flow V of the test branch c The flow rate v of the test branch is replaced.

[0036] Specifically, in a preferred embodiment, in step S04,

[0037] The measurement method of ΔP: the water cooling system is operated, the inlet pressure P1 and the outlet pressure P2 in the initial state are recorded, which is recorded as the first measurement, and the system is stopped after the first measurement is completed;

[0038] The measurement method of ΔP1: the branch to be measured is selected and determined, the corresponding quick connector model of the branch is selected and replaced on the device, and the quick connection model is recorded, then the device is connected in series to the measuring branch of the water cooling system, the device is connected in series from the inlet of the branch equipment, the power supply of the flow measurement device is turned on after the connection is completed, the system is started for the second measurement, the flow of the flow measurement device of the branch is read out, and the inlet pressure P1 and the outlet pressure P2 are recorded, which is recorded as the second measurement, and the system is stopped after the measurement is completed;

[0039] The measurement method of ΔP2: the quick connector of a branch other than the measuring branch is disconnected, the branch is interrupted, the device is kept in series connection on the measuring branch, the system is started for the third measurement, the flow of the flow meter is recorded, and the inlet pressure P1 and the outlet pressure P2 are recorded, which is the third measurement data, and the system is stopped, then the device is removed, and the original quick connector is installed back according to the initial state of the water cooling system, so that the water cooling system remains in the state before the measurement starts.

[0040] The above measuring step effectively associates the flow testing device with the pressure-flow correction algorithm, simplifying the testing process in the case of a cooling system with a large number of branches.

[0041] Specifically, in a preferred embodiment, the temperature of the cooling medium in the test branch remains constant during the measuring process.

[0042] Maintaining the cooling system in a steady state during the testing process, i.e. the temperature of the cooling medium does not change, greatly maintains the accuracy of the measurement results.

[0043] Compared with the prior art, the advantages of the present application are that the flow testing device is simple and easy to install and test, and in combination with the correction algorithm through the total road inlet and outlet pressure values to obtain the real flow of the branch, avoiding the change of the flow resistance characteristics of the branch caused by the connection of the flow testing device, thereby causing the flow testing error, and realizing that without designing and installing flow meters on the branches of the multi-branch cooling system, the real flow of each branch during operation can also be obtained through testing. BRIEF DESCRIPTION OF DRAWINGS

[0044] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings. In which:

[0045] Figure 1 The overall structure of the device of embodiment 1 of the present application is schematically shown;

[0046] Figure 2 The resistance coefficient testing method of the quick connector component in embodiment 2 of the present application is schematically shown;

[0047] Figure 3 The resistance coefficient testing method of the device after the quick connector component is removed for multi-branch flow measurement in embodiment 2 of the present application is schematically shown;

[0048] Figure 4 The pressure drop testing method of the branch in embodiment 2 of the present application is schematically shown.

[0049] In the drawings, the same components use the same reference numerals. The drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0050] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings. In which:

[0051] Figure 1 The overall structure of the device of embodiment 1 of the present application is schematically shown. Figure 2 The resistance coefficient testing method of the quick connector component in embodiment 2 of the present application is schematically shown; Figure 3The resistance coefficient test method after dismounting the quick connector components of the device for multi-branch flow measurement in the embodiment 2 of the present application is schematically shown. Figure 4 The pressure drop test method of the branch in the embodiment 2 of the present application is schematically shown.

[0052] Embodiment 1

[0053] As Figure 1 shown in the figure, the device 10 for multi-branch flow measurement in the embodiment of the present application comprises a quick connector 1, a quick connector seat 2, a connecting pipe and a flow measurement device 6, wherein the quick connector 1 and the quick connector seat 2 are arranged at the two ends of the connecting pipe 5 in a detachable manner, and the flow measurement device 6 is arranged on the connecting pipe 5.

[0054] The device for multi-branch flow measurement in the embodiment of the present application has simple structure, light weight and is convenient to carry. Since the quick connector components are arranged in a detachable manner, the device is easy to install and test.

[0055] Specifically, in the embodiment, the connecting pipe 5 comprises two groups of hoses, the flow measurement device 6 is arranged between the two groups of hoses, and the quick connector 1 and the quick connector seat 2 are arranged at the ends of the hoses away from the flow measurement device 6. The use of the hoses can further reduce the weight of the entire test device and thus facilitate carrying. Specifically, in the embodiment, the two ends of the hoses are connected with the threaded connectors 3 through the clamps 4. The use of the clamps and the threaded connectors can further increase the convenience of installation and testing of the entire device.

[0056] As Figure 1 further shown in the figure, in the embodiment, a straight pipe section 7 is arranged between the two groups of hoses, and the flow measurement device 6 is arranged between the straight pipe section 7 and one of the groups of hoses. The addition of the straight pipe section facilitates the arrangement of the flow measurement device such as the flow meter and increases the convenience of installation and testing. Specifically, in the embodiment, the flow measurement device 6 comprises a flow meter. The use of the flow meter to measure the flow makes the structure of the entire device simple, easy to arrange and install, and the measurement result intuitive and accurate.

[0057] Embodiment 2

[0058] The method for multi-branch flow measurement in the embodiment of the present application comprises the following steps:

[0059] S01, as Figure 2 shown in the figure, the quick connector 1 and the quick connector seat 2 in the device 10 are connected to the branches of the cooling system, and the pressure drop ΔP of the quick connector 1 and the quick connector seat 2 under different flow conditions is measured. k ;

[0060] S02, as Figure 3As shown, the part of the device after the quick coupling 1 and the quick coupling seat 2 are removed is connected to the branch of the cooling system, and the pressure drop ΔP of the device without the quick coupling 1 and the quick coupling seat 2 under different flow conditions is measured l ;

[0061]

[0062]

[0063] wherein: ε k is the inertial resistance coefficient of the quick coupling and the quick coupling seat, ε′ k is the viscous resistance coefficient of the quick coupling and the quick coupling seat, ε l is the inertial resistance coefficient of the device without the quick coupling and the quick coupling seat, ε′ l is the viscous resistance coefficient of the device without the quick coupling and the quick coupling seat, ρ is the density of the cooling medium, V c is the flow of the test branch;

[0064] S03, the relationship between ΔP k , ΔP l and V c is obtained by fitting the experimental data

[0065] ΔP k = mV c 2 + nV c ; ΔP l = aV c 2 + bV c ; wherein m, n, a and b are obtained by experiment;

[0066] The inertial resistance coefficient ε k , the viscous resistance coefficient ε′ k of the quick coupling and the quick coupling seat, the inertial resistance coefficient ε l , the viscous resistance coefficient ε′ l of the device without the quick coupling and the quick coupling seat are calculated respectively

[0067]

[0068] S04, the pressure drop ΔP caused by the test branch of the cooling system without the device is measured;

[0069] The pressure drop ΔP1 caused by the test branch of the cooling system with the device is measured;

[0070] Disconnecting a branch of the cooling system other than the test branch, changing the pressure drop ΔP2 caused by adding the device to the test branch of the cooling system;

[0071] The inertia resistance coefficient ε, the viscous resistance coefficient ε' and the flow V of the test branch of the cooling system without adding the device can be obtained through ΔP, ΔP1 and ΔP2 c .

[0072] According to the method for multi-branch flow testing provided in the embodiments of the present application, since different quick connectors are often used to balance the resistance of each branch during the design of the cooling system, the types of the quick connectors used on the branches are different, in order to make the resistance characteristics of the flow testing tooling more accurate, the quick connector resistance coefficient testing method and the flow testing device (except the quick connector end) resistance coefficient testing method are set, and the pressure drop ΔP of the quick connector under different flow conditions is measured in sequence during the testing process k and the pressure drop ΔP of the flow testing device (except the quick connector end) under different flow conditions is measured in sequence during the testing process l The pressure-flow correction algorithm can effectively eliminate the changes in the flow resistance characteristics of the pipeline caused by the introduction of the flow meter, so that the branch flow of the cooling system without connecting the flow meter can be accurately obtained, the flow measurement device and the pressure-flow correction algorithm are effectively associated, and the testing process under the condition that the cooling system has many branches is simplified, therefore, the device and the method for multi-branch flow testing provided in the present application can effectively obtain the accurate flow values of each branch of the cooling system in the actual operation through simple testing, and the real flow of each branch in the operation process can be obtained without designing and installing the flow meter on the branches of the multi-branch cooling system.

[0073] Specifically, in the present embodiment, in step S04,

[0074] Specifically, in an embodiment not shown, the flow V of the test branch c is replaced by the flow rate v of the test branch.

[0075] Specifically, in the present embodiment, as Figure 4 shown, in step S04,

[0076] The measurement method of ΔP: running the water cooling system, recording the inlet pressure P1 and the outlet pressure P2 in the initial state, as the first measurement, stopping after the first measurement is completed;

[0077] The measuring method of ΔP1: select and determine the branch A to be measured, select the corresponding quick connector model of the branch A, replace the model on the device, and record the model of the quick connector, then connect the device in series on the measuring branch A of the water cooling system, connect the device from the inlet of the branch equipment, turn on the power supply of the flowmeter after the connection, and read the flow of the flowmeter of the branch A, and record the inlet pressure P1 and the outlet pressure P2, which is the second measurement, and stop the measurement after the measurement;

[0078] The measuring method of ΔP2: disconnect the quick connector of a branch outside the measuring branch A, interrupt the branch, keep the device in series on the measuring branch A, turn on the power supply of the flowmeter, and record the flow of the flowmeter, and record the inlet pressure P1 and the outlet pressure P2, which is the third measurement, and stop the measurement, then remove the device, and install the original quick connector according to the initial state of the water cooling system, so that the water cooling system remains in the state before the measurement.

[0079] Then, the above steps are repeated to measure the branch B, and the second and third measurements are completed.

[0080] Replace the C, D, E, F, G and H branches, and repeat the above steps to complete the measurement of all branches.

[0081] Specifically, in the embodiment, the temperature of the cooling medium in the test branch remains constant during the measurement. The cooling system is kept in a stable state during the test, that is, the temperature of the cooling medium does not change, so that the accuracy of the measurement result is greatly maintained.

[0082] According to the above embodiment, it can be seen that the device for multi-branch flow test can obtain the real flow of the branch by the correction algorithm of the inlet and outlet pressure values of the total road, avoid the change of the flow test error caused by the change of the flow resistance characteristics of the branch caused by the connection of the flow test device, and realize the real flow of each branch in the running process without designing and installing the flowmeter on the branch of the multi-branch cooling system.

[0083] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for multi-branch flow testing by a device for multi-branch flow testing, characterized in that, The device comprises quick connector components, connecting pipes and flow measuring devices; wherein, The quick connectors are arranged at both ends of the connecting pipes in a detachable manner; The flow measuring devices are arranged on the connecting pipes; the method comprises the steps of: S01, remove the quick connector in the device, and connect the quick connector to the branch of the cooling system, measure the pressure drop of the quick connector under different flow conditions ; S02, connecting the part of the device after the quick coupling component is removed to a branch of the cooling system, measuring the pressure drop of the device without the quick coupling component under different flow conditions ; wherein: is the inertial resistance coefficient of the quick connector component, is the viscous resistance coefficient of the quick connector, is the inertial resistance coefficient of the device for removing the quick connector component, is the viscous resistance coefficient of the device for removing the quick connector component, is the density of the cooling medium, is the flow rate of the test branch; S03. The relationship between the experimental data and the fitted data is shown in FIG.

3. , and between them. ； ； The inertia resistance coefficient of the quick connector component is calculated respectively , the viscous resistance coefficient , the inertia resistance coefficient of the device for removing the quick connector component , the viscous resistance coefficient ; m, n, a and b are obtained experimentally; S04. Measuring the pressure drop induced by the test branch of the cooling system when the device is not incorporated ; Measuring the pressure drop caused by a test branch of a cooling system when added to the device ; Turning off a branch of the cooling system other than the test branch, changing the pressure drop caused by the test branch of the cooling system when the device is added ; The inertance resistance coefficient , and of the test branch of the cooling system not joined to the device are determined , the viscous resistance coefficient and the flow .

2. The method of claim 1 for performing multi-branch flow testing of the apparatus for multi-branch flow testing, wherein, The connecting pipes comprise two groups of hoses, the flow measuring devices are arranged between the two groups of hoses, and the quick connector components are arranged at one end of the hoses away from the flow measuring devices.

3. The method of claim 2, wherein the apparatus for multi-branch flow testing is used to perform a multi-branch flow test. Straight pipe sections are arranged between the two groups of hoses, and the flow measuring devices are arranged between one of the straight pipe sections and the group of hoses.

4. Method for performing a multi-leg flow test with a device according to claim 2 or 3, characterized in that, The hoses are connected to the threaded joints through clamps at both ends.

5. The method of claim 1 or 3 for performing multi-branch flow testing using the apparatus for multi-branch flow testing, wherein, The flow measuring devices comprise flow meters.

6. The method of claim 1 for performing multi-branch flow testing of the apparatus for multi-branch flow testing, wherein, In the step S04, ; ； 。 7. The method of claim 6, wherein the apparatus for multi-branch flow testing is used to perform a multi-branch flow test. flow rate of the test branch replacing the flow rate of the test branch v .

8. The method of claim 1 for performing multi-branch flow testing of the apparatus for multi-branch flow testing, wherein, In the step S04, Measurement method: Run the water cooling system, record the inlet pressure P1 and outlet pressure P2 in the initial state, and mark it as the first measurement. After the first measurement is completed, stop the machine; Measurement method: select and determine the branch to be measured, select the corresponding quick connector model of the branch, replace it on the device, and record the quick connector model. Then, connect the device in series to the measuring branch of the water cooling system, connect the device in series from the inlet of the branch equipment, turn on the power supply of the flow measurement device after completion, start the second measurement, read the flow of the flow measurement device of the branch, and record the inlet pressure P1 and outlet pressure P2 as the second measurement. Stop after measurement. Measurement method: disconnect the quick joint of a branch outside the measuring branch, interrupt the branch, keep the device in series in the measuring branch, start the third measurement, record the flow meter flow, and record the inlet pressure P1 and the outlet pressure P2, which is the third measurement data, stop, then remove the device, and install the original quick joint back to the initial state of the water cooling system, so that the water cooling system remains in the state before the measurement starts.

9. A method of performing a multi-branch flow test using the apparatus of any one of claims 6 to 8, wherein, During the measurement, the temperature of the cooling medium in the test branch remains constant.

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