Fluid flow distribution control system and method

Abstract

The invention provides a fluid flow distribution control system and method, and belongs to the field of fluid distribution.The fluid flow distribution control system comprises an upper computer, a lower computer, a first independent flow controller, a second independent flow controller and a plurality of public flow controllers, the first independent flow controller is located on a first branch, and the second independent flow controller is located on a second branch; the input ends of the public flow controllers are connected and then connected to the input end of the first independent flow controller and the input end of the second independent flow controller, and the output ends of the public flow controllers are connected to the input ends of the three-way valves respectively. The first output ends of the three-way valves are connected to the output end of the first independent flow controller, and the second output ends of the three-way valves are connected to the output end of the second independent flow controller; by adding the branches and adding the three-way valve at the rear end of the public flow controller, the flow of each branch is accurately distributed according to the total flow, and no additional flow controller needs to be added.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid distribution, and in particular to a fluid flow distribution control system and method. Background Art

[0002] A flow controller is a device that can accurately control the flow of a fluid. Generally, the flow of a flow controller has a certain range. When the required flow is greater than the upper limit of the flow controller, multiple flow controllers need to be connected in parallel. In the field of hydrogen energy equipment testing, such as fuel cell or electrolyzer testing, it is necessary to control the gas or water at different temperatures and pressures, and the same number of additional flow controllers are required, which greatly increases the cost. Simple flow distribution can only meet the requirements of areas with low flow accuracy, and is not suitable for working conditions with high flow accuracy requirements.

[0003] In the prior art, a Chinese utility model patent with announcement number CN220228277U discloses an adjustable water flow distributor, including a water flow distributor body and a connecting pipe. Through the provided adjustment structure and adjustment slot, the water distribution pipe can be adjusted by rotating the threaded rod up and down, so that the water flow and flow rate flowing through the water distribution pipe inside the water flow distributor body can be adjusted, and then the water is released by opening and closing the valve, so as to achieve the regulation and control of the water flow. However, the water flow distributor is not suitable for flow regulation with high precision requirements, and the flow cannot be fed back in real time. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to accurately distribute the fluid flow and reduce the number of flow controllers used.

[0005] The present invention solves the above technical problems through the following technical solutions: a fluid flow distribution control system, comprising: an upper computer, a lower computer, a first independent flow controller, a second independent flow controller, and multiple common flow controllers, wherein the first independent flow controller is located on a first branch, and the second independent flow controller is located on a second branch, and the input ends of the multiple common flow controllers are connected to each other and are respectively connected to the input end of the first independent flow controller and the input end of the second independent flow controller, and the output ends of the multiple common flow controllers are respectively connected to the input end of a three-way valve, and the first output end of the three-way valve is connected to the output end of the first independent flow controller, and the second output end of the three-way valve is connected to the output end of the second independent flow controller, the upper computer is connected to the lower computer in communication, and the lower computer is connected to the first independent flow controller, the second independent flow controller, multiple common flow controllers and multiple three-way valves.

[0006] The present invention adds a branch and a three-way valve at the rear end of a common flow controller, wherein the first output end of the three-way valve is connected to the output end of a first independent flow controller, and the second output end of the three-way valve is connected to the output end of a second independent flow controller. The flow of each branch is accurately distributed according to the total flow, and there is no need to add an additional flow controller, thereby reducing the use cost of the flow controller and greatly improving the utilization efficiency of the flow controller. The present invention has a very fast response speed, and the entire control process is within 2 seconds. The flow controller is used to control the fluid flow to ensure the flow control accuracy. The present invention can be applied to an electrolyzer or a fuel cell test system to improve the test efficiency.

[0007] Preferably, the multiple common flow controllers include a first common flow controller, a second common flow controller, and a third common flow controller, and each branch where the common flow controller is located has a three-way valve, the output end of the first common flow controller is connected to the input end of the first three-way valve, the output end of the second common flow controller is connected to the input end of the second three-way valve, the output end of the third common flow controller is connected to the input end of the third three-way valve, the first output ends of the first three-way valve, the second three-way valve, and the third three-way valve are connected to the output end of the first independent flow controller, and the second output ends of the first three-way valve, the second three-way valve, and the third three-way valve are connected to the output end of the second independent flow controller.

[0008] Preferably, it further comprises a filter, wherein the filter is located between the fluid input end and the node connected to the input ends of the plurality of common flow controllers.

[0009] Preferably, it also includes a first check valve and a second check valve, wherein the first check valve is located between the output end of the first independent flow controller and the flow outlet of the first branch, and the second check valve is located between the output end of the second independent flow controller and the flow outlet of the first branch.

[0010] Preferably, it also includes a first pressure sensor, a second pressure sensor, and a third pressure sensor, wherein the first pressure sensor is located at the rear end of the filter, the second pressure sensor is located at the rear end of the first check valve, and the third pressure sensor is located at the rear end of the second check valve.

[0011] The present invention also provides a fluid flow distribution control method, based on the fluid flow distribution control system, comprising: the upper computer sends the branch flow according to the total flow, the lower computer calculates the number of flow controllers required for each branch according to the branch flow, when the branch flow is less than or equal to the maximum flow value of the flow controller, only the independent flow controller on the branch is turned on, when the branch flow is greater than the maximum flow value of the flow controller, the independent flow controller on the branch and the common flow controllers on N-1 adjacent branches are turned on, N is the number of flow controllers required for each branch, and the number of flow controllers required for each branch N is calculated by the following formula:

[0012] Where X′ is the branch traffic, X is the maximum traffic value of the traffic controller, and [] indicates rounding.

[0013] Preferably, when the total flow is 0-2X, when 0<Y<X and 0<Z<X, X is the maximum flow value of the flow controller, Y is the downward flow of the first branch, and Z is the downward flow of the second branch, only the first independent flow controller and the second independent flow controller are turned on.

[0014] Preferably, when the total flow is X-3X, when 0<Y<X and X<Z<2X, Y is the flow sent by the first branch, Z is the flow sent by the second branch, the first independent flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output end of the third three-way valve is closed, and the second output end is opened;

[0015] When X<Y<2X and 0<Z<X, the first independent flow controller, the first common flow controller, and the second independent flow controller are turned on, the first output end of the first three-way valve is opened, and the second output end is closed.

[0016] Preferably, when the total flow is 2X-4X, when 0<Y<X and 2X<Z<3X, Y is the flow sent by the first branch, Z is the flow sent by the second branch, the first independent flow controller, the second common flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output ends of the second three-way valve and the third three-way valve are closed, and the second output ends are opened;

[0017] When X<Y<2X and X<Z<2X, the first independent flow controller, the first common flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output end of the first three-way valve is opened, and the second output end is closed, and the first output end of the third three-way valve is closed, and the second output end is opened;

[0018] When 2X<Y<3X and 0<Z<X, the first independent flow controller, the first common flow controller, the second common flow controller, and the second independent flow controller are turned on, the first output ends of the first three-way valve and the second three-way valve are opened, and the second output ends are closed.

[0019] Preferably, when the total flow is 3X-5X, when 0<Y<X and 3X<Z<4X, Y is the flow sent by the first branch, Z is the flow sent by the second branch, the first independent flow controller, the first common flow controller, the second common flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output ends of the first three-way valve, the second three-way valve, and the third three-way valve are closed, and the second output ends are opened;

[0020] When X<Y<2X and 2X<Z<3X, the first independent flow controller, the first common flow controller, the second common flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output end of the first three-way valve is opened, and the second output end is closed, and the first output ends of the second three-way valve and the third three-way valve are closed, and the second output ends are opened;

[0021] When 2X<Y<3X and X<Z<2X, the first independent flow controller, the first common flow controller, the second common flow controller, the third common flow controller, and the second independent flow controller are turned on, the first output end of the first three-way valve and the second three-way valve are opened, and the second output end is closed, and the first output end of the third three-way valve is closed, and the second output end is opened;

[0022] When 3X<Y<4X and 0<Z<X, the first independent flow controller, the first common flow controller, the second common flow controller, the third common flow controller, and the second independent flow controller are turned on, and the first output ends of the first three-way valve, the second three-way valve, and the third three-way valve are opened, and the second output ends are closed.

[0023] The advantages provided by the present invention are:

[0024] 1. The present invention adds a branch and a three-way valve at the rear end of a common flow controller. The first output end of the three-way valve is connected to the output end of the first independent flow controller, and the second output end of the three-way valve is connected to the output end of the second independent flow controller. The flow of each branch is accurately distributed according to the total flow, and there is no need to add an additional flow controller, which reduces the use cost of the flow controller and greatly improves the utilization efficiency of the flow controller. It has a very fast response speed, and the entire control process is within 2s. The flow controller is used to control the fluid flow to ensure the flow control accuracy. It can be applied to an electrolyzer or fuel cell test system to improve the test efficiency.

[0025] 2. The flow control method of the present invention sends branch flows separately according to the total flow. By allocating independent flow controllers and common flow controllers, and sending the flows of each flow controller, and coordinating the direction switching of the three-way valve, the required flow of each branch can be achieved conveniently and quickly. At the same time, the flow controller and the three-way switching valve will provide feedback to the host computer to ensure the correctness of the branch flow and ensure the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a fluid flow distribution control system and method provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a fluid flow distribution control system and method provided by an embodiment of the present invention in which a common flow controller is one;

[0028] Figure 3 A schematic diagram of three common flow controllers in a fluid flow distribution control system and method provided by an embodiment of the present invention;

[0029] Figure 4-7 A schematic diagram of flow distribution of different total flow rates in a fluid flow distribution control method provided by an embodiment of the present invention;

[0030] Figure 8 A flow rate response time diagram of a fluid flow distribution control system and method provided by an embodiment of the present invention;

[0031] Fig. 9 A schematic diagram of a fluid flow distribution control system and method provided by an embodiment of the present invention applied to an electrolytic cell;

[0032] Fig.10 A schematic diagram of a fluid flow distribution control system and method provided by an embodiment of the present invention applied to a fuel cell testing system;

[0033] In the figure: 1 filter, 2 first pressure sensor, 3 first independent flow controller, 4 first common flow controller, 5 second common flow controller, 6 third common flow controller, 7 second independent flow controller, 8 first three-way valve, 9 second three-way valve, 10 third three-way valve, 11 first check valve, 12 second pressure sensor, 13 second check valve, 14 third pressure sensor, 15 first branch, 16 second branch, 17 first electrolyzer, 18 second electrolyzer, 19 humidifier, 20 fuel cell. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-3As shown, this embodiment provides a fluid flow distribution control system, including: an upper computer, a lower computer, a first independent flow controller 3, a second independent flow controller 7, and multiple common flow controllers, the first independent flow controller 3 is located on the first branch 15, the second independent flow controller 7 is located on the second branch 16, the input ends of the multiple common flow controllers are connected to the input end of the first independent flow controller 3 and the input end of the second independent flow controller 7, the output ends of the multiple common flow controllers are respectively connected to the input end of a three-way valve, the first output end of the three-way valve is connected to the output end of the first independent flow controller 3, the second output end of the three-way valve is connected to the output end of the second independent flow controller 7, the upper computer is communicatively connected to the lower computer, and the lower computer is connected to the first independent flow controller 3, the second independent flow controller 7, multiple common flow controllers and multiple three-way valves.

[0036] The first independent flow controller 3, the second independent flow controller 7, and the plurality of common flow controllers are all flow control units, and the three-way valve is a flow distribution unit. Figure 3 As shown, the present invention is explained by taking the number of three common flow controllers as an example, and the multiple common flow controllers include a first common flow controller 4, a second common flow controller 5, and a third common flow controller 6. Each branch where the common flow controller is located has a three-way valve, the output end of the first common flow controller 4 is connected to the input end of the first three-way valve 8, the first output end of the first three-way valve 8 is connected to the output end of the first independent flow controller 3, the second output end of the first three-way valve 8 is connected to the output end of the second independent flow controller 7, the output end of the second common flow controller 5 is connected to the input end of the second three-way valve 9, the first output end of the second three-way valve 9 is connected to the output end of the first independent flow controller 3, the second output end of the second three-way valve 9 is connected to the output end of the second independent flow controller 7, the output end of the third common flow controller 6 is connected to the input end of the third three-way valve 10, the first output end of the third three-way valve 10 is connected to the output end of the first independent flow controller 3, and the second output end of the third three-way valve 10 is connected to the output end of the second independent flow controller 7.

[0037] It also includes a filter 1, which is located between the node connecting the fluid input end and the input ends of multiple common flow controllers. The filter is used to filter the fluid, strictly control the purity of the front-end fluid, and protect the rear-end independent flow controller and the common flow controller.

[0038] It also includes a first check valve 11 and a second check valve 13. The first check valve 11 is located between the output end of the first independent flow controller 3 and the flow outlet of the first branch 15, and the second check valve 13 is located between the output end of the second independent flow controller 7 and the flow outlet of the first branch 16. The first check valve 11 and the second check valve 13 are used to prevent the fluid from flowing back into the independent flow controller or the common flow controller and causing damage.

[0039] It also includes a first pressure sensor 2, a second pressure sensor 12, and a third pressure sensor 14. The first pressure sensor 2 is located at the rear end of the filter 1, and is used to monitor and measure the fluid pressure at the outlet of the filter 1. The second pressure sensor 12 is located at the rear end of the first check valve 11, and is used to monitor and measure the pressure at the flow outlet of the first branch 15. The third pressure sensor 14 is located at the rear end of the second check valve 13, and is used to monitor and measure the pressure at the flow outlet of the second branch 16.

[0040] The first independent flow controller 3, the second independent flow controller 7 and the common flow controller are adjustable pumps, thermal flow controllers or differential pressure flow controllers or Coriolis flow controllers.

[0041] The three-way valve is an L-type three-way valve, and the L-type three-way valve is a pneumatic three-way valve and an electric three-way valve.

[0042] like Figure 1 As shown, this embodiment provides a fluid flow distribution control method, including: the upper computer sends the branch flow according to the total flow, the lower computer calculates the number of flow controllers required for each branch according to the branch flow, when the branch flow is less than or equal to the maximum flow value of the flow controller, only the independent flow controller on the branch is turned on, when the branch flow is greater than the maximum flow value of the flow controller, the independent flow controller on the branch and the common flow controllers on N-1 adjacent branches are turned on, N is the number of flow controllers required for each branch, and the number of flow controllers required for each branch N is calculated by the following formula:

[0043] Where X′ is the branch traffic, X is the maximum traffic value of the traffic controller, and [] indicates rounding.

[0044] Assume that the downstream flow of the first branch 15 is Y, and the downstream flow of the second branch 16 is Z. When the total flow is 0-2X, 0<Y<X and 0<Z<X, X is the maximum flow value of the flow controller, only the first independent flow controller 3 and the second independent flow controller 7 are turned on, and the flow control unit sends the flow value of the first independent flow controller 3 as Y, and the flow value of the second independent flow controller 7 as Z. At this time, all three-way valves do not need to be operated. The flow range of the first independent flow controller 3 is 0-X, and the flow range of the second independent flow controller 7 is 0-X, which control the flow of the first branch and the second branch respectively.

[0045] When the total flow is X-3X, 0<Y<X and X<Z<2X, the first independent flow controller 3, the second independent flow controller 7 and a common flow controller on the branch adjacent to the second independent flow controller 7 are turned on, the first output end of the three-way valve connected in series with the common flow controller is closed, and the second output end is opened. The present invention turns on the third common flow controller 6, the first output end of the third three-way valve 10 is closed, and the second output end is opened, the first three-way valve 8 and the second three-way valve 9 do not need to be operated, the flow range of the first independent flow controller 3 is 0-X, the flow of the third common flow controller 6 is X, the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 controls the flow of the first branch 15, and the third common flow controller 6 and the second independent flow controller 7 control the flow of the second branch 16.

[0046] When the total flow is X-3X, X<Y<2X and 0<Z<X, the first independent flow controller 3, the second independent flow controller 7 and a common flow controller on the branch adjacent to the first independent flow controller 3 are turned on, and the first output end of the three-way valve connected in series with the common flow controller is opened, and the second output end is closed. The present invention turns on the first common flow controller 4, the first output end of the first three-way valve 8 is opened, and the second output end is closed, and the second three-way valve 9 and the third three-way valve 10 do not need to be operated, the flow range of the first independent flow controller 3 is 0-X, the flow of the first common flow controller 4 is X, and the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 and the first common flow controller 4 control the flow of the first branch 15, and the second independent flow controller 7 controls the flow of the second branch 16.

[0047] When the total flow is 2X-4X, 0<Y<X and 2X<Z<3X, the first independent flow controller 3, the second independent flow controller 7 and the two common flow controllers on the branch adjacent to the second independent flow controller 7 are turned on, and the first output end of the three-way valve connected in series with the common flow controller is closed, and the second output end is opened. The present invention turns on the second common flow controller 5 and the third common flow controller 6, the first output ends of the second three-way valve 9 and the third three-way valve 10 are closed, and the second output ends are opened, and the first three-way valve 8 does not need to be operated, the flow range of the first independent flow controller 3 is 0-X, the flow rates of the second common flow controller 5 and the third common flow controller 6 are both X, the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 controls the flow of the first branch 15, and the second common flow controller 5, the third common flow controller 6 and the second independent flow controller 7 control the flow of the second branch 16.

[0048] When the total flow is 2X-4X, X<Y<2X and X<Z<2X, turn on the first independent flow controller 3, the second independent flow controller 7, the common flow controller on the branch adjacent to the first independent flow controller 3, and the common flow controller on the branch adjacent to the second independent flow controller 7, the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the first independent flow controller 3 is opened, and the second output end is closed, the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the second independent flow controller 7 is closed, and the second output end is opened. The present invention turns on the first common flow controller 4 and the third common flow controller 6, the first output end of the first three-way valve 8 is opened, and the second output end is closed, the first output end of the third three-way valve 10 is closed, and the second output end is opened, the second three-way valve 9 does not need to be operated, the flow range of the first independent flow controller 3 is 0-X, the flow range of the second independent flow controller 7 is 0-X, the flow rates of the first common flow controller 4 and the third common flow controller 6 are both X, the first independent flow controller 3 and the first common flow controller 4 control the flow rate of the first branch 15, and the second independent flow controller 7 and the third common flow controller 6 control the flow rate of the second branch 16.

[0049] When the total flow is 2X-4X, 2X<Y<3X and 0<Z<X, the first independent flow controller 3, the second independent flow controller 7 and the two common flow controllers on the branch adjacent to the first independent flow controller 3 are turned on, and the first output end of the three-way valve connected in series with the common flow controller is opened, and the second output end is closed. The present invention turns on the first common flow controller 4 and the second common flow controller 5, the first output ends of the first three-way valve 8 and the second three-way valve 9 are opened, and the second output ends are closed, and the third three-way valve 10 does not need to be operated, the flow range of the first independent flow controller 3 is 0-X, the flow rates of the first common flow controller 4 and the second common flow controller 5 are both X, the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 and the first common flow controller 4 and the second common flow controller 5 control the flow of the first branch 15, and the second independent flow controller 7 controls the flow of the second branch 16.

[0050] When the total flow is 3X-5X, 0<Y<X and 3X<Z<4X, the first independent flow controller 3, the second independent flow controller 7 and the three common flow controllers on the branch adjacent to the second independent flow controller 7 are turned on, and the first output end of the three-way valve connected in series with the common flow controller is closed, and the second output end is opened. The present invention turns on the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6, the first output ends of the first three-way valve 8, the second three-way valve 9, and the third three-way valve 10 are closed, and the second output ends are opened, the flow range of the first independent flow controller 3 is 0-X, the flow of the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 are all X, the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 controls the flow of the first branch 15, and the second independent flow controller 7 and the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 control the flow of the second branch 16.

[0051] When the total flow is 3X-5X, X<Y<2X and 2X<Z<3X, turn on the first independent flow controller 3, the second independent flow controller 7, the common flow controller on the branch adjacent to the first independent flow controller 3, and the two common flow controllers on the branch adjacent to the second independent flow controller 7, the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the first independent flow controller 3 is opened, and the second output end is closed, and the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the second independent flow controller 7 is closed, and the second output end is opened. The present invention turns on the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6, the first output end of the first three-way valve 8 is opened, and the second output end is closed, the first output ends of the second three-way valve 9 and the third three-way valve 10 are closed, and the second output ends are opened, the flow range of the first independent flow controller 3 is 0-X, the flow range of the second independent flow controller 7 is 0-X, the flow rates of the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 are all X, the first independent flow controller 3 and the first common flow controller 4 control the flow rate of the first branch 15, and the second independent flow controller 7 and the second common flow controller 5, and the third common flow controller 6 control the flow rate of the second branch 16.

[0052] When the total flow is 3X-5X, 2X<Y<3X and X<Z<2X, turn on the first independent flow controller 3, the second independent flow controller 7, the two common flow controllers on the branch adjacent to the first independent flow controller 3, and the common flow controller on the branch adjacent to the second independent flow controller 7, the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the first independent flow controller 3 is opened, and the second output end is closed, and the first output end of the three-way valve connected in series with the common flow controller on the branch adjacent to the second independent flow controller 7 is closed, and the second output end is opened. The present invention turns on the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6, the first output ends of the first three-way valve 8 and the second three-way valve 9 are opened, and the second output ends are closed, the first output end of the third three-way valve 10 is closed, and the second output end is opened, the flow range of the first independent flow controller 3 is 0-X, the flow range of the second independent flow controller 7 is 0-X, the flow rates of the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 are all X, the first independent flow controller 3 and the first common flow controller 4 and the second common flow controller 5 control the flow rate of the first branch 15, and the second independent flow controller 7 and the third common flow controller 6 control the flow rate of the second branch 16.

[0053] When the total flow is 3X-5X, 3X<Y<4X and 0<Z<X, the first independent flow controller 3, the second independent flow controller 7 and the three common flow controllers on the branch adjacent to the first independent flow controller 3 are turned on, and the first output end of the three-way valve connected in series with the common flow controller is opened, and the second output end is closed. The present invention turns on the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6, the first output ends of the first three-way valve 8, the second three-way valve 9, and the third three-way valve 10 are opened, and the second output ends are closed, the flow range of the first independent flow controller 3 is 0-X, the flow of the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 are all X, the flow range of the second independent flow controller 7 is 0-X, the first independent flow controller 3 and the first common flow controller 4, the second common flow controller 5, and the third common flow controller 6 control the flow of the first branch 15, and the second independent flow controller 7 controls the flow of the second branch 16.

[0054] The upper computer also has flow transmission protection for each branch: when the first branch 15 transmits flow Y, 0<Y<X, the maximum flow transmitted by the second branch 16 is 4X; when X<Y<2X, the maximum flow transmitted by the second branch 16 is 3X; when 2X<Y<3X, the maximum flow transmitted by the second branch 16 is 2X; when 3X<Y<4X, the maximum flow transmitted by the second branch 16 is X.

[0055] See also Figure 4-7 , define the first output end of the three-way valve as port A, and the second output end of the three-way valve as port B. The flow distribution under different total flows is summarized in a table as follows:

[0056] Table 1 Flow distribution table

[0057]

[0058] The fluid flow distribution control system and method of the present invention can accurately distribute the flow of each branch according to the total flow by adding an additional three-way valve at the rear end of the common flow controller, without adding the same number of additional flow controllers, greatly improving the utilization efficiency of the flow controller and having a very fast response speed. Figure 8 As shown, the entire control process is within 2s, which can be applied to electrolyzer or fuel cell test system to help improve test efficiency. When applied to electrolyzer, the fluid is deionized water source, such as Fig. 9 As shown, the flow outlet of the first branch 15 is connected to the first electrolytic cell 17, and the flow outlet of the second branch 16 is connected to the second electrolytic cell 18. When applied to a fuel cell test system, as shown in FIG. Fig.10As shown, the fluid is gas, the first branch 15 is a dry gas circuit, the fluid outlet of the second branch 16 is connected to the input end of the humidification box 19, the output end of the humidification box 19 is connected to the fluid outlet of the first branch 15 and then connected to the fuel cell 20, the humidification box 19 is used to humidify the gas in the second branch 16, that is, the second branch 16 is a wet gas circuit, and the humidification method can be bubbling humidification or spraying humidification or bubbling spraying humidification. At this time, the fluid flow distribution control system can provide any humidification amount of gas, thereby realizing the function of quickly adjusting the gas dew point for the fuel cell test system.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluid flow distribution control system, characterized in that: include: An upper computer, a lower computer, a first independent flow controller (3), a second independent flow controller (7), and a plurality of common flow controllers, wherein the first independent flow controller (3) is located on a first branch (15), the second independent flow controller (7) is located on a second branch (16), the input ends of the plurality of common flow controllers are connected to each other and are respectively connected to the input end of the first independent flow controller (3) and the input end of the second independent flow controller (7), the output ends of the plurality of common flow controllers are respectively connected to the input end of a three-way valve, the first output end of the three-way valve is connected to the output end of the first independent flow controller (3), and the second output end of the three-way valve is connected to the output end of the second independent flow controller (7), the upper computer is in communication connection with the lower computer, and the lower computer is connected to the first independent flow controller (3), the second independent flow controller (7), the plurality of common flow controllers, and the plurality of three-way valves.

2. The fluid flow distribution control system according to claim 1, characterized in that: The plurality of common flow controllers include a first common flow controller (4), a second common flow controller (5), and a third common flow controller (6); each common flow controller has a three-way valve in its branch; the output end of the first common flow controller (4) is connected to the input end of the first three-way valve (8); the output end of the second common flow controller (5) is connected to the input end of the second three-way valve (9); the output end of the third common flow controller (6) is connected to the input end of the third three-way valve (10); the first output ends of the first three-way valve (8), the second three-way valve (9), and the third three-way valve (10) are connected to the output end of the first independent flow controller (3); and the second output ends of the first three-way valve, the second three-way valve, and the third three-way valve are connected to the output end of the second independent flow controller (7).

3. The fluid flow distribution control system according to claim 1, characterized in that: It also comprises a filter (1), wherein the filter (1) is located between the fluid input end and a node connected to the input ends of a plurality of common flow controllers.

4. The fluid flow distribution control system according to claim 3, characterized in that: It also includes a first check valve (11) and a second check valve (13), wherein the first check valve (11) is located between the output end of the first independent flow controller (3) and the flow outlet of the first branch (15), and the second check valve (13) is located between the output end of the second independent flow controller (7) and the flow outlet of the first branch (16).

5. The fluid flow distribution control system according to claim 1, characterized in that: It also includes a first pressure sensor (2), a second pressure sensor (12), and a third pressure sensor (14), wherein the first pressure sensor (2) is located at the rear end of the filter (1), the second pressure sensor (12) is located at the rear end of the first check valve (11), and the third pressure sensor (14) is located at the rear end of the second check valve (13).

6. A fluid flow distribution control method, based on the fluid flow distribution control system according to any one of claims 1 to 5, characterized in that: include: The upper computer sends the branch flow according to the total flow, and the lower computer calculates the number of flow controllers required for each branch according to the branch flow. When the branch flow is less than or equal to the maximum flow value of the flow controller, only the independent flow controller on the branch is turned on. When the branch flow is greater than the maximum flow value of the flow controller, the independent flow controller on the branch and the public flow controllers on N-1 adjacent branches are turned on. N is the number of flow controllers required for each branch. The number of flow controllers required for each branch, N, is calculated by the following formula: Where X′ is the branch traffic, X is the maximum traffic value of the traffic controller, and [] indicates rounding.

7. The fluid flow distribution control method according to claim 6, characterized in that: When the total flow is 0-2X, when 0<Y<X and 0<Z<X, X is the maximum flow value of the flow controller, Y is the downstream flow of the first branch (15), and Z is the downstream flow of the second branch (16), only the first independent flow controller (3) and the second independent flow controller (7) are turned on.

8. The fluid flow distribution control method according to claim 6, characterized in that: When the total flow is X-3X, when 0<Y<X and X<Z<2X, Y is the flow sent by the first branch (15), Z is the flow sent by the second branch (16), the first independent flow controller (3), the third common flow controller (6), and the second independent flow controller (7) are turned on, the first output end of the third three-way valve (10) is closed, and the second output end is opened; When X<Y<2X and 0<Z<X, the first independent flow controller (3), the first common flow controller (4), and the second independent flow controller (7) are turned on, the first output end of the first three-way valve (8) is opened, and the second output end is closed.

9. The fluid flow distribution control method according to claim 6, characterized in that: When the total flow is 2X-4X, when 0<Y<X and 2X<Z<3X, Y is the flow sent by the first branch (15), Z is the flow sent by the second branch (16), the first independent flow controller (3), the second common flow controller (5), the third common flow controller (6), and the second independent flow controller (7) are turned on, the first output ends of the second three-way valve (9) and the third three-way valve (10) are closed, and the second output ends are opened; When X<Y<2X and X<Z<2X, the first independent flow controller (3), the first common flow controller (4), the third common flow controller (6), and the second independent flow controller (7) are turned on, the first output end of the first three-way valve (8) is opened, and the second output end is closed, and the first output end of the third three-way valve (10) is closed, and the second output end is opened; When 2X<Y<3X and 0<Z<X, the first independent flow controller (3), the first common flow controller (4), the second common flow controller (5), and the second independent flow controller (7) are turned on, and the first output ends of the first three-way valve (8) and the second three-way valve (9) are opened, and the second output ends are closed.

10. The fluid flow distribution control method according to claim 6, characterized in that: When the total flow is 3X-5X, when 0<Y<X and 3X<Z<4X, Y is the flow sent by the first branch (15), Z is the flow sent by the second branch (16), the first independent flow controller (3), the first common flow controller (4), the second common flow controller (5), the third common flow controller (6), and the second independent flow controller (7) are turned on, and the first output ends of the first three-way valve (8), the second three-way valve (9), and the third three-way valve (10) are closed, and the second output ends are opened; When X<Y<2X and 2X<Z<3X, the first independent flow controller (3), the first common flow controller (4), the second common flow controller (5), the third common flow controller (6), and the second independent flow controller (7) are turned on, the first output end of the first three-way valve (8) is opened, and the second output end is closed, and the first output ends of the second three-way valve (9) and the third three-way valve (10) are closed, and the second output ends are opened; When 2X<Y<3X and X<Z<2X, the first independent flow controller (3), the first common flow controller (4), the second common flow controller (5), the third common flow controller (6), and the second independent flow controller (7) are turned on, the first output ends of the first three-way valve (8) and the second three-way valve (9) are opened, and the second output ends are closed, and the first output end of the third three-way valve (10) is closed, and the second output end is opened; When 3X<Y<4X and 0<Z<X, the first independent flow controller (3), the first common flow controller (4), the second common flow controller (5), the third common flow controller (6), and the second independent flow controller (7) are turned on, and the first output ends of the first three-way valve (8), the second three-way valve (9), and the third three-way valve (10) are opened, and the second output ends are closed.

Images