Test board

Abstract

The utility model discloses a testboard, and relates to the field of flowmeter testboards. The test board comprises a water storage tank, a measuring cylinder unit, a transfer water tank, an electric appliance control cabinet, a control unit, a water pump and an electric fitting drain valve unit. According to the test board, the measuring cylinder water inlet pipeline adopts a shared pipeline for water inlet and adopts a same outlet for discharging air, so that the same pressure and liquid density in each measuring cylinder are ensured, and the increase of large and small flow reference errors caused by pressure and volume changes is avoided; the closing time of the double-valve electromagnetic valve is quantitatively controlled through the electric appliance control cabinet, after the volume reaches 95% of the designated volume, the large valve is automatically closed through the double-valve electromagnetic valve, small-flow water supply reaches 100% of the designated volume, and the situation that when large-flow water supply is carried out, due to the fact that the flow speed is high and the speed is high, the flow rate is large is avoided; instant cut-off easily causes damage to a pipeline valve.

Description

Technical Field

[0001] This utility model relates to the technical field of flow meter test benches, specifically to test benches. Background Technology

[0002] A flow meter test bench is a specialized piece of equipment used to test, calibrate, and verify the performance of flow meters. Its core function is to ensure the accuracy, stability, and reliability of flow meter measurements.

[0003] The flowmeter test bench determines the error range of the flowmeter under test by comparing it with a high-precision standard flowmeter, and generates a calibration curve or correction coefficient. It tests the linearity of the flowmeter at different flow points to ensure measurement consistency across the entire range.

[0004] In existing technologies, water inlet pipes are used for water intake, resulting in differences in pressure and liquid density within the measuring cylinder. This leads to increased errors in the flow rate reference due to pressure and volume variations. Furthermore, during high-flow-rate water supply, the high flow velocity makes it easy for valves to be damaged if the flow is abruptly cut off. When high-velocity liquid surges to the neck of the measuring cylinder, the narrow neck allows the liquid to easily overflow at high speed, resulting in inaccurate measurement. When it is necessary to switch the water supply flow rate to a lower flow rate, the flow rate needs to be manually adjusted to supply a smaller measuring cylinder. Therefore, we propose a testing platform. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a testing platform that solves the problems of varying pressure and liquid density in graduated cylinders due to different water inlet pipes, leading to increased errors in flow rate benchmarks caused by pressure and volume changes. Furthermore, during high-flow-rate water supply, the high flow velocity makes it easy for valves to be damaged if the flow is abruptly cut off. Additionally, when high-velocity liquid surges to the neck of the graduated cylinder, the narrow neck allows the liquid to easily overflow at high speed, resulting in inaccurate measurements. Finally, when switching to a lower flow rate, manual adjustment of the flow rate is required for supplying a smaller graduated cylinder.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a test bench, comprising:

[0007] A water storage tank is used to hold liquids;

[0008] A measuring cylinder unit, which is connected to a water storage tank via a pipe, is used to hold a fixed quantity of liquid;

[0009] A transfer water tank is connected to a water storage tank and a measuring cylinder unit via a pipeline, and the transfer water tank is located between the water storage tank and the measuring cylinder unit;

[0010] The electrical control cabinet, which is installed on the intermediate water tank, is used to control the circulation of liquid in the storage tank, measuring cylinder unit and intermediate water tank.

[0011] a control unit, which is arranged on the pipeline between the water storage tank, the cylinder unit and the transit water tank, and through the opening control of the control unit, the circulation of the liquid is ensured, and the pressure and the liquid density of the cylinder unit are the same;

[0012] a water pump, which is arranged directly on the pipeline between the water storage tank, the cylinder unit and the transit water tank, and the water pump is powered to cooperate with multiple on-off electromagnetic valves to make the system circulate the liquid;

[0013] an electric liquid discharge valve unit, which is arranged at the liquid discharge port of the cylinder unit, and is used for controlling the transit of the liquid in the cylinder unit.

[0014] Preferably, the cylinder unit includes a 500ml cylinder, a 200ml cylinder and a 100ml cylinder, the cylinder unit is used to carry a certain amount of liquid, the electric liquid discharge valve unit includes a No. 3 electric liquid discharge valve, a No. 2 electric liquid discharge valve and a No. 1 electric liquid discharge valve, the No. 3 electric liquid discharge valve is installed at the liquid outlet of the 500ml cylinder, the No. 2 electric liquid discharge valve is installed at the liquid outlet of the 200ml cylinder, and the No. 1 electric liquid discharge valve is installed at the liquid outlet of the 100ml cylinder, and the 500ml cylinder, the 200ml cylinder and the 100ml cylinder control the liquid discharge of the No. 3 electric liquid discharge valve, the No. 2 electric liquid discharge valve and the No. 1 electric liquid discharge valve respectively.

[0015] Preferably, the control unit includes:

[0016] a No. 2 on-off electromagnetic valve, which is used to communicate the water storage tank and the cylinder unit;

[0017] a No. 3 on-off electromagnetic valve, which is installed at the liquid inlet of the 500ml cylinder;

[0018] a No. 4 on-off electromagnetic valve, which is installed at the liquid inlet of the 200ml cylinder;

[0019] a No. 5 on-off electromagnetic valve, which is installed at the liquid inlet of the 100ml cylinder, and the No. 2 on-off electromagnetic valve, the No. 3 on-off electromagnetic valve, the No. 4 on-off electromagnetic valve and the No. 5 on-off electromagnetic valve are communicated on the same pipeline.

[0020] Preferably, the two sides of the No. 2 on-off electromagnetic valve are connected with three-way pipes, the No. 2 on-off electromagnetic valve is communicated with a flow regulating unit through the two three-way pipes, the flow regulating unit includes a pressure transmitter and a flow regulating valve, the pressure transmitter and the flow regulating valve are communicated with the two three-way pipes respectively, and the pressure transmitter and the flow regulating valve are communicated through a communication pipeline, which is used to control the liquid to be delivered to the cylinder unit at a small flow rate.

[0021] Preferably, the second switch electromagnetic valve is communicated with a standard flowmeter through a pipeline away from the side of the third switch electromagnetic valve, the standard flowmeter is communicated with a measured flowmeter through a pipeline, and the measured flowmeter and the standard flowmeter display the liquid flow volume.

[0022] Preferably, the measured flowmeter is communicated with a double-valve electromagnetic valve through a pipeline, the double-valve electromagnetic valve is communicated with a water storage tank through a pipeline, and the pipeline is installed at the upper end of the water storage tank, a seventh switch electromagnetic valve is installed between the pipeline between the water storage tank and the double-valve electromagnetic valve, and the seventh switch electromagnetic valve is communicated with a water pump through a tee joint.

[0023] Preferably, the water pump is installed with a tee joint away from the other side of the seventh switch electromagnetic valve, the tee joint is communicated with the water storage tank and the transfer water tank through pipelines, a sixth switch electromagnetic valve is installed between the pipeline between the tee joint and the water storage tank, and an eighth switch electromagnetic valve is installed between the pipeline between the tee joint and the transfer water tank.

[0024] Preferably, small flow pipelines are installed below the pipelines of the second switch electromagnetic valve, the third switch electromagnetic valve, the fourth switch electromagnetic valve and the fifth switch electromagnetic valve, the small flow pipelines are communicated with the transfer water tank, a first switch electromagnetic valve is installed on the small flow pipelines, and the first switch electromagnetic valve is used for discharging air between the liquid and the measuring cylinder.

[0025] The utility model discloses a test bench, it has the beneficial effect as follows:

[0026] The test bench, the measuring cylinder water inlet pipeline adopts the water inlet of common pipeline, and the same outlet discharges air, guarantees the pressure and liquid density in the entering various measuring cylinders same, avoids the increase of the reference error of large and small flow caused by pressure and volume change;

[0027] A standard flowmeter is designed in the upstream of the measured flowmeter, the standard flowmeter quantitatively outputs volume, and harm accidents caused by liquid spraying due to inaccuracy of the measured flowmeter are avoided;

[0028] A double-valve electromagnetic valve is designed in the upstream of the standard flowmeter, the double-valve electromagnetic valve is quantitatively controlled to close time volume by an electric control cabinet, and the double-valve electromagnetic valve is automatically closed when the specified volume reaches 95%, and small flow water supply reaches 100%, so that pipeline valve damage caused by high flow rate and high speed when large flow water supply is instantaneously cut off is avoided, and when high flow rate liquid gushes to the neck part of the corresponding measuring cylinder, liquid is easily high-speed out of the measuring cylinder due to the narrowness of the neck part of the measuring cylinder, and inaccurate measurement is caused;

[0029] The flow regulating valve and the switch electromagnetic valve combination switch are designed on the measuring cylinder liquid inlet pipeline, the water supply flow rate is small flow when the switch electromagnetic valve is closed, and small measuring cylinders are directly supplied without adjusting the flow rate, so that switching is convenient and fast. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Fig. 2 This is the left view of the present invention;

[0033] Fig. 3 This is a top view of the present invention.

[0034] In the diagram: 1. Water storage tank; 2. Measuring cylinder unit; 21. 500ml measuring cylinder; 22. 200ml measuring cylinder; 23. 100ml measuring cylinder; 3. Transfer water tank; 4. Electrical control cabinet; 5. Control unit; 51. No. 1 solenoid valve; 52. No. 2 solenoid valve; 53. No. 3 solenoid valve; 54. No. 4 solenoid valve; 55. No. 5 solenoid valve; 56. No. 6 solenoid valve; 57. No. 7 solenoid valve; 58. No. 8 solenoid valve; 59. Double valve solenoid valve; 510. Flow meter under test; 511. Standard flow meter; 6. Water pump; 7. Electric drain valve unit; 71. No. 3 electric drain valve; 72. No. 2 electric drain valve; 73. No. 1 electric drain valve; 8. Flow regulating unit; 81. Pressure transmitter; 82. Flow regulating valve. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The embodiment of the application provides a test bench, which solves the problems that the water inlet pipes of the measuring cylinders respectively adopt corresponding pipes to inlet water, the pressure and the liquid density in the measuring cylinders are different, the reference error of large and small flow rates caused by the pressure and volume changes is increased, when large flow rate water supply is performed, the high flow rate and speed of the water flow causes the pipeline valve to be damaged when the water flow is instantaneously cut off, when the high flow rate water flow gushes to the neck of the measuring cylinder, the liquid is easily high-speed ejected from the measuring cylinder due to the narrow neck of the measuring cylinder, and the measurement is inaccurate, and when it is required to switch the water supply flow rate to a small flow rate, the flow rate needs to be manually adjusted to supply a small measuring cylinder, the water inlet pipes of the measuring cylinders adopt a shared pipe to inlet water, the same outlet discharges air, the pressure and the liquid density in the measuring cylinders are ensured to be the same, and the reference error of large and small flow rates caused by the pressure and volume changes is avoided from being increased.

[0037] A standard flow meter 511 is designed upstream of the measured flow meter 510, the standard flow meter 511 quantitatively outputs a volume, and harm accidents caused by liquid spraying due to inaccuracy of the measured flow meter 510 are avoided.

[0038] A double-valve electromagnetic valve 59 is designed upstream of the standard flow meter 511, the double-valve electromagnetic valve 59 is quantitatively controlled by the electric control cabinet 4 to close the time volume to 95% of the specified volume, and then the double-valve electromagnetic valve 59 is automatically closed, and small flow rate water supply is performed to 100% of the specified volume, so that when large flow rate water supply is performed, the high flow rate and speed of the water flow cause the pipeline valve to be damaged when the water flow is instantaneously cut off, and when the high flow rate water flow gushes to the neck of the corresponding measuring cylinder, the liquid is easily high-speed ejected from the measuring cylinder due to the narrow neck of the measuring cylinder, and the measurement is inaccurate.

[0039] A flow regulating valve 82 and a switch electromagnetic valve are combined on the liquid inlet pipeline of the measuring cylinder, and when the switch electromagnetic valve is closed, the water supply flow rate is a small flow rate, and the flow rate does not need to be adjusted, and the small measuring cylinder is directly supplied, so that switching is convenient and fast.

[0040] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings of the specification and specific embodiments.

[0041] The embodiment of the application discloses a test bench.

[0042] Embodiment one:

[0043] According to the drawings, Figs. 1-3 as shown, comprising:

[0044] The water storage tank 1 is used for carrying liquid;

[0045] The measuring cylinder unit 2 is connected with the water storage tank 1 through a pipeline, and the measuring cylinder unit 2 is used for carrying a quantitative liquid;

[0046] The transfer water tank 3 is connected with the water storage tank 1 and the measuring cylinder unit 2 through a pipeline, and the transfer water tank 3 is between the water storage tank 1 and the measuring cylinder unit 2.

[0047] An electric control cabinet 4 is arranged on the transfer tank 3 for controlling the circulation of liquid in the water storage tank 1, the measuring cylinder unit 2 and the transfer tank 3;

[0048] A control unit 5 is arranged on the pipeline between the water storage tank 1, the measuring cylinder unit 2 and the transfer tank 3, and the circulation of liquid is controlled by the opening control of the control unit 5 to ensure that the pressure and liquid density of the measuring cylinder unit 2 are the same;

[0049] The liquid inlet pipeline of the measuring cylinder uses a common pipeline to introduce liquid, and the same outlet discharges air to ensure that the pressure and liquid density entering each measuring cylinder are the same, and to avoid the increase of the size flow reference error caused by the change of pressure and volume;

[0050] A water pump 6 is arranged directly on the pipeline between the water storage tank 1, the measuring cylinder unit 2 and the transfer tank 3, and the water pump 6 is the power to cooperate with multiple on-off electromagnetic valves to make the system circulate liquid;

[0051] An electric liquid discharge valve unit 7 is arranged at the liquid discharge port of the measuring cylinder unit 2 for controlling the transfer of liquid in the measuring cylinder unit 2.

[0052] The measuring cylinder unit 2 includes a 500ml measuring cylinder 21, a 200ml measuring cylinder 22 and a 100ml measuring cylinder 23, and the measuring cylinder unit 2 is used to carry a certain amount of liquid. The electric liquid discharge valve unit 7 includes a No. 3 electric liquid discharge valve 71, a No. 2 electric liquid discharge valve 72 and a No. 1 electric liquid discharge valve 73.

[0053] The No. 3 electric liquid discharge valve 71 is installed at the liquid outlet port of the 500ml measuring cylinder 21, the No. 2 electric liquid discharge valve 72 is installed at the liquid outlet port of the 200ml measuring cylinder 22, and the No. 1 electric liquid discharge valve 73 is installed at the liquid outlet port of the 100ml measuring cylinder 23. The 500ml measuring cylinder 21, the 200ml measuring cylinder 22 and the 100ml measuring cylinder 23 control the liquid discharge of the No. 3 electric liquid discharge valve 71, the No. 2 electric liquid discharge valve 72 and the No. 1 electric liquid discharge valve 73, respectively.

[0054] The control unit 5 includes:

[0055] A No. 2 on-off electromagnetic valve 52 is used to communicate the water storage tank 1 and the measuring cylinder unit 2;

[0056] A No. 3 on-off electromagnetic valve 53 is installed at the liquid inlet port of the 500ml measuring cylinder 21;

[0057] A No. 4 on-off electromagnetic valve 54 is installed at the liquid inlet port of the 200ml measuring cylinder 22;

[0058] The fifth switch electromagnetic valve 55 is installed at the liquid inlet of the 100ml measuring cylinder 23, and the second switch electromagnetic valve 52, the third switch electromagnetic valve 53, the fourth switch electromagnetic valve 54 and the fifth switch electromagnetic valve 55 are communicated on the same pipeline.

[0059] The second switch electromagnetic valve 52 is connected with two three-way pipes, and is communicated with the flow regulating unit 8 through the two three-way pipes. The flow regulating unit 8 comprises a pressure transmitter 81 and a flow regulating valve 82, which are communicated with the two three-way pipes respectively, and are communicated through a communication pipe. The pressure transmitter 81 and the flow regulating valve 82 are used for controlling the liquid to be delivered into the measuring cylinder unit 2 at a small flow rate.

[0060] The flow regulating valve 82 and the switch electromagnetic valve are combined on the liquid inlet pipeline of the measuring cylinder, and the water supply flow rate is small when the switch electromagnetic valve is closed. Therefore, the small measuring cylinder can be directly supplied without adjusting the flow rate, and the switching is convenient and fast.

[0061] The second switch electromagnetic valve 52 is communicated with a standard flow meter 511 through a pipeline at a side far away from the third switch electromagnetic valve 53. The standard flow meter 511 is communicated with a measured flow meter 510 through a pipeline. The measured flow meter 510 and the standard flow meter 511 display the liquid flow volume.

[0062] A standard flow meter 511 is designed at the upstream of the measured flow meter 510. The standard flow meter 511 quantitatively outputs the volume, so that the harmful accidents caused by the liquid spraying due to the inaccuracy of the measured flow meter 510 are avoided.

[0063] Embodiment 2

[0064] According to the drawings Figs. 1-3 The measured flow meter 510 is communicated with a double-valve electromagnetic valve 59 through a pipeline. The double-valve electromagnetic valve 59 is communicated with the water storage tank 1 through a pipeline. The pipeline is installed at the upper end of the water storage tank 1. A seventh switch electromagnetic valve 57 is installed between the pipeline between the water storage tank 1 and the double-valve electromagnetic valve 59. The seventh switch electromagnetic valve 57 is communicated with the water pump 6 through a three-way pipe connected at the end of the seventh switch electromagnetic valve 57.

[0065] A double-valve electromagnetic valve 59 is designed at the upstream of the standard flow meter 511. The double-valve electromagnetic valve 59 is quantitatively controlled by the electric control cabinet 4. When the volume of the closed time reaches 95% of the specified volume, the double-valve electromagnetic valve 59 is automatically closed. The small flow rate water supply reaches 100% of the specified volume. When the large flow rate water supply is cut off, the pipeline valve is easily damaged. When the high flow rate liquid is sprayed to the corresponding measuring cylinder neck, the liquid is easily high-speed out of the measuring cylinder due to the narrow neck of the measuring cylinder, so that the measurement is inaccurate.

[0066] The water pump 6 is installed with a three-way pipe on the other side away from the seven switch electromagnetic valve 57, the three-way pipe is connected with the water storage tank 1 and the transfer water tank 3 through pipes respectively, the pipe between the three-way pipe and the water storage tank 1 is installed with the six switch electromagnetic valve 56, and the pipe between the three-way pipe and the transfer water tank 3 is installed with the eight switch electromagnetic valve 58.

[0067] The pipes of the two switch electromagnetic valve 52, the three switch electromagnetic valve 53, the four switch electromagnetic valve 54 and the five switch electromagnetic valve 55 are installed with a small flow pipe below, the small flow pipe is connected with the transfer water tank 3, and the small flow pipe is installed with the one switch electromagnetic valve 51, the one switch electromagnetic valve 51 is used for discharging air between the liquid and the measuring cylinder

[0068] Working principle: since the flow meter detected by the system has high precision, the measuring cylinder with the precision higher than 0.0025% is selected, the time for emptying the measuring cylinder is strictly controlled every time, and the 500ml measuring cylinder 21, the 200ml measuring cylinder 22 and the 100ml measuring cylinder 23 must be filled with water every time when starting measurement, so that subsequent operation is facilitated.

[0069] S1: through the operation of the electric control cabinet 4, the panel system is opened, the corresponding input volume of the 500ml measuring cylinder 21, the 200ml measuring cylinder 22 and the 100ml measuring cylinder 23 is pressed first, the system is started, the water pump 6 works, the double valve electromagnetic valve 59 is automatically opened when the water pump 6 works, the two switch electromagnetic valve 52 and the six switch electromagnetic valve 56 corresponding to the 500ml measuring cylinder 21, the 200ml measuring cylinder 22 and the 100ml measuring cylinder 23 are opened through the operation switch on the panel, at this time, other valves on the system are in the closed state;

[0070] S2: the water in the water storage tank 1 is transported to the specified measuring cylinder through the double valve electromagnetic valve 59, the standard flow meter 511, the two switch electromagnetic valve 52 and the pipe under the action of the water pump 6, when the volume reaches 95% of the specified volume, the double valve electromagnetic valve 59 is automatically closed, the small flow water supply reaches 100% of the specified volume, and the pump is automatically stopped to prevent the liquid from spilling out of the measuring cylinder due to the high flow rate, thereby causing the measurement error;

[0071] S3: the three switch electromagnetic valve 53 switch of the 500ml measuring cylinder 21 on the panel is opened, the time relay controls the time setting of the switch to be automatically closed for 5 minutes, the same time control can obtain the same wall volume in the measuring cylinder, so that the repeatability error of each measurement is smaller. Since the height of the corresponding electric discharge valve unit 7 on the measuring cylinder is lower than that of the water storage tank 1, the water can only be written into the transfer water tank 3, and after the six switch electromagnetic valve 56 and the eight switch electromagnetic valve 58 are closed and the seven switch electromagnetic valve 57 is opened, the water pump 6 is started to transport the water in the transfer water tank 3 to the water storage tank 1, and then the water pump 6 is stopped and the seven switch electromagnetic valve 57 is closed.

[0072] S4: start the panel switch, start working, open the first switch electromagnetic valve 51 and manually adjust the regulating valve switch, discharge the air between the liquid and the measuring cylinder, then adjust the flow rate to 55L / min, which is the minimum measuring flow rate of the measured flow meter 510, run for 10 seconds, then close the first switch electromagnetic valve 51, close the system switch to reset the panel data, then restart the panel quantitative input 500L volume and press the start button to start the system, clear the data displayed by the measured flow meter 510 to avoid the water hammer effect, at this time the measured flow meter 510 may have a small volume display, open the third switch electromagnetic valve 53, the liquid enters the 500ml measuring cylinder 21, when the system stops working, the liquid volume in the 500ml measuring cylinder 21 is also about 500L, manually close the third switch electromagnetic valve 53, and record the accurate data of the 500ml measuring cylinder 21, record the data displayed by the measured flow meter 510, and input the computer to calculate the error.

[0073] S5: repeat the above S2 and S3 steps three times, measure three results, and calculate the error and repeatability,

[0074] S6: use the same method as in the above S2 and S3 steps to fill the liquid into the 200ml measuring cylinder 22 and the 500ml measuring cylinder 21 respectively three times, calculate the recorded data, realize the detection of the measured flow meter 510, judge whether it is qualified or not, and issue the detection result.

[0075] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. Test bench, characterized in that It includes: a water storage tank (1) for carrying liquid; a measuring cylinder unit (2) connected to the water storage tank (1) through a pipeline, the measuring cylinder unit (2) for carrying a certain amount of liquid; a transfer water tank (3) connected to the water storage tank (1) and the measuring cylinder unit (2) through a pipeline, the transfer water tank (3) being between the water storage tank (1) and the measuring cylinder unit (2); an electrical control cabinet (4) provided on the transfer water tank (3) for controlling the circulation of liquid in the water storage tank (1), the measuring cylinder unit (2) and the transfer water tank (3); a control unit (5) provided on the pipeline between the water storage tank (1), the measuring cylinder unit (2) and the transfer water tank (3), the circulation of liquid being controlled by the opening of the control unit (5) to ensure that the pressure and liquid density of the measuring cylinder unit (2) are the same; a water pump (6) provided directly on the pipeline between the water storage tank (1), the measuring cylinder unit (2) and the transfer water tank (3), the water pump (6) being powered to cooperate with multiple on-off electromagnetic valves to circulate the liquid; an electrical liquid discharge valve unit (7) provided at the liquid outlet of the measuring cylinder unit (2) for controlling the transfer of liquid in the measuring cylinder unit (2).

2. The test stand of claim 1, wherein, The measuring cylinder unit (2) includes a 500ml measuring cylinder (21), a 200ml measuring cylinder (22) and a 100ml measuring cylinder (23), the measuring cylinder unit (2) for carrying a certain amount of liquid, the electrical liquid discharge valve unit (7) including a No. 3 electrical liquid discharge valve (71), a No. 2 electrical liquid discharge valve (72) and a No. 1 electrical liquid discharge valve (73), the No. 3 electrical liquid discharge valve (71) being installed at the liquid outlet of the 500ml measuring cylinder (21), the No. 2 electrical liquid discharge valve (72) being installed at the liquid outlet of the 200ml measuring cylinder (22), the No. 1 electrical liquid discharge valve (73) being installed at the liquid outlet of the 100ml measuring cylinder (23), the 500ml measuring cylinder (21), the 200ml measuring cylinder (22) and the 100ml measuring cylinder (23) controlling the discharge of liquid from the No. 3 electrical liquid discharge valve (71), the No. 2 electrical liquid discharge valve (72) and the No. 1 electrical liquid discharge valve (73) respectively.

3. The test stand of claim 1, wherein, The control unit (5) includes: a No. 2 on-off electromagnetic valve (52) for connecting the water storage tank (1) and the measuring cylinder unit (2); a No. 3 on-off electromagnetic valve (53) installed at the liquid inlet of the 500ml measuring cylinder (21); a No. 4 on-off electromagnetic valve (54) installed at the liquid inlet of the 200ml measuring cylinder (22); a No. 5 on-off electromagnetic valve (55) installed at the liquid inlet of the 100ml measuring cylinder (23), the No. 2 on-off electromagnetic valve (52), the No. 3 on-off electromagnetic valve (53), the No. 4 on-off electromagnetic valve (54) and the No. 5 on-off electromagnetic valve (55) being connected on the same pipeline.

4. The test stand of claim 3, wherein, The two sides of the second switch electromagnetic valve (52) are connected with three-way pipes, the second switch electromagnetic valve (52) is communicated with the flow regulating unit (8) through two three-way pipes, the flow regulating unit (8) comprises a pressure transmitter (81) and a flow regulating valve (82), the pressure transmitter (81) and the flow regulating valve (82) are communicated with the two three-way pipes respectively, the pressure transmitter (81) and the flow regulating valve (82) are communicated through a communication pipe, and the liquid is controlled to be delivered to the measuring cylinder unit (2) at a small flow.

5. The test stand of claim 3, wherein, The side, away from the third switch electromagnetic valve (53), of the second switch electromagnetic valve (52) is communicated with a standard flowmeter (511) through a pipeline, the standard flowmeter (511) is communicated with a measured flowmeter (510) through a pipeline, and the measured flowmeter (510) and the standard flowmeter (511) display the volume of the liquid flow.

6. The test stand of claim 5, wherein, The measured flowmeter (510) is communicated with a double-valve electromagnetic valve (59) through a pipeline, the double-valve electromagnetic valve (59) is communicated with the water storage tank (1) through a pipeline, the pipeline is installed at the upper end of the water storage tank (1), a seventh switch electromagnetic valve (57) is installed between the pipeline between the water storage tank (1) and the double-valve electromagnetic valve (59), and the seventh switch electromagnetic valve (57) is communicated with a water pump (6) through a three-way pipe.

7. The test stand of claim 1, wherein, The water pump (6) is installed with a three-way pipe on the other side, away from the seventh switch electromagnetic valve (57), the three-way pipe is communicated with the water storage tank (1) and the transfer water tank (3) through pipelines respectively, a sixth switch electromagnetic valve (56) is installed between the pipeline between the three-way pipe and the water storage tank (1), and an eighth switch electromagnetic valve (58) is installed between the pipeline between the three-way pipe and the transfer water tank (3).

8. The test stand of claim 3, wherein, The pipelines of the second switch electromagnetic valve (52), the third switch electromagnetic valve (53), the fourth switch electromagnetic valve (54) and the fifth switch electromagnetic valve (55) are installed with small flow pipelines below, the small flow pipelines are communicated with the transfer water tank (3), a first switch electromagnetic valve (51) is installed on the small flow pipelines, and the first switch electromagnetic valve (51) is used for discharging air between the liquid and the measuring cylinder.

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