A smart flow detection device for a micro flow control valve

Abstract

This utility model discloses an intelligent flow detection device for a micro-flow control valve, applied in the field of micro-flow control valve technology. It includes a support frame, with a pressure tank and a water tank respectively bolted to both sides inside the support frame. A pressure regulating valve is fixedly connected to one side of the top of the pressure tank, and a flow meter is fixedly connected to the other side of the top of the pressure tank via a pipe. The control valve to be measured is installed on the top of the support frame, and a displacement sensor is bolted to the top of the control valve. By employing intelligent computer program control, the flow rate of the micro-flow control valve is measured under three different pressures and opening degrees specified in the corresponding standard (GB / T17213). The three measurements are then averaged. The displacement data from the displacement sensor is read to plot a relevant curve, thereby improving the efficiency and accuracy of micro-flow control valve detection.

Description

Technical Field

[0001] This utility model belongs to the field of micro-flow control valve technology, and specifically relates to an intelligent flow detection device for micro-flow control valves. Background Technology

[0002] Control valves with a Cv value less than 0.8 are called micro-flow regulating valves. In layman's terms, the smallest Cv value is 0.0002, which means that the flow rate of the control valve is only 0.0002 tons (0.0002 m3 / h) per hour.

[0003] Currently, Chinese utility model patent CN216286906U discloses an intelligent flow control valve based on wireless data transmission. When testing micro-flow control valves, it is generally necessary to perform tests at different opening degrees specified in GB / T17213 (the standard specifies testing opening degrees of 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%). However, existing micro-flow control valves can only perform a single pressure test during the testing process, and cannot measure flow rate under three different pressures and the standard-specified opening degrees. Therefore, the testing efficiency and accuracy of micro-flow control valves are relatively low. Utility Model Content

[0004] The purpose of this invention is to provide an intelligent flow detection device for a micro-flow control valve. Its advantage is that it can measure the flow rate under three different pressures and standard opening degrees, thereby improving the efficiency and accuracy of micro-flow control valve detection.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a micro flow control valve intelligent flow detection device, including a support frame, a pressure tank and a water tank are respectively bolted to both sides inside the support frame, a pressure regulating valve is fixedly connected to one side of the top of the pressure tank, a flow meter is fixedly connected to the other side of the top of the pressure tank through a pipe, the control valve to be measured is installed on the top of the support frame, and a displacement sensor is bolted to the top of the control valve to be measured.

[0006] By employing the above technical solution and utilizing intelligent computer program control, the flow rate of a micro-flow control valve can be measured under three different pressures and opening degrees specified in the corresponding standard (GB / T17213). The displacement data from the displacement sensor is then read to plot the relevant curves, thereby improving the efficiency and accuracy of micro-flow control valve detection.

[0007] The present invention is further configured such that: the two sides of the control valve under test near the pressure tank and the water tank are respectively connected to a front pressure sensor and a rear pressure sensor via pipes; the other ends of the front pressure sensor and the rear pressure sensor are respectively connected to a front shut-off valve and a rear shut-off valve via pipes; a temperature sensor is fixedly connected between the front shut-off valve and the front pressure sensor via a pipe; and the other end of the front shut-off valve is fixedly connected to a flow meter via a pipe.

[0008] By adopting the above technical solution, the efficiency and accuracy of detection of micro-flow control valves are improved.

[0009] The present invention is further configured such that: the other end of the rear-end throttling valve is fixedly connected to a return water pipe used in conjunction with the water tank.

[0010] By adopting the above technical solution, the water inside the back-end shut-off valve is returned to the inside of the water tank through the return water pipe for storage.

[0011] The present invention is further configured such that: the pressure regulating valve, displacement sensor, front-end shut-off valve, and rear-end shut-off valve are electrically connected to the computer test control program through a DA module; and the flow meter, front-end pressure sensor, rear-end pressure sensor, and displacement sensor are electrically connected to the computer test control program through an AD module.

[0012] Using the above technical solution and intelligent computer program control, measurements were performed under three different pressures and standard opening degrees.

[0013] In summary, this utility model has the following beneficial effects:

[0014] By employing intelligent computer program control, the flow rate of a micro-flow control valve is measured under three different pressures and opening degrees specified in the corresponding standard (GB / T17213). The three measurements are then averaged, and displacement data from a displacement sensor is read to plot a relevant curve, thereby improving the efficiency and accuracy of micro-flow control valve detection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the working process of this utility model;

[0017] Figure 3 This is a circuit diagram of this utility model.

[0018] Reference numerals: 1. Pressure tank; 2. Flow meter; 3. Front-end shut-off valve; 4. Front-end pressure sensor; 5. Control valve under test; 6. Displacement sensor; 7. Rear-end pressure sensor; 8. Rear-end shut-off valve; 9. Water tank; 10. Pressure regulating valve; 11. Return water pipe; 12. Temperature sensor; 13. Support frame. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1:

[0021] refer to Figure 1 , Figure 2 , Figure 3 A smart flow detection device for a micro-flow control valve includes a support frame 13. A pressure tank 1 and a water tank 9 are respectively bolted to both sides of the support frame 13. A pressure regulating valve 10 is fixedly connected to one side of the top of the pressure tank 1, and a flow meter 2 is fixedly connected to the other side of the top of the pressure tank 1 via a pipe. The control valve 5 to be measured is installed on the top of the support frame 13, and a displacement sensor 6 is bolted to the top of the control valve 5. By employing intelligent computer program control, the flow rate of the micro-flow control valve is measured under three different pressures and at the opening degree specified in the corresponding standard GB / T17213. The displacement data from the displacement sensor is then read to plot a relevant curve, thereby improving the efficiency and accuracy of the micro-flow control valve detection.

[0022] refer to Figure 1 The control valve 5 under test is fixedly connected to a front-end pressure sensor 4 and a rear-end pressure sensor 7 via pipes on both sides near the pressure tank 1 and water tank 9, respectively. The other ends of the front-end pressure sensor 4 and the rear-end pressure sensor 7 are connected to a front-end shut-off valve 3 and a rear-end shut-off valve 8 via pipes, respectively. A temperature sensor 12 is fixedly connected between the front-end shut-off valve 3 and the front-end pressure sensor 4 via a pipe. The other end of the front-end shut-off valve 3 is fixedly connected to a flow meter 2 via a pipe. This improves the efficiency and accuracy of detecting micro-flow control valves.

[0023] refer to Figure 1 The other end of the rear shut-off valve 8 is fixedly connected to a return water pipe 11 that works in conjunction with the water tank 9. This allows the water inside the rear shut-off valve 8 to flow back into the water tank 9 through the return water pipe 11 for storage.

[0024] refer to Figure 1 , Figure 2The pressure regulating valve 10, displacement sensor 6, front-end shut-off valve 3, and rear-end shut-off valve 8 are electrically connected to the computer test and control program via a DA module. The flow meter 2, front-end pressure sensor 4, rear-end pressure sensor 7, and displacement sensor 6 are electrically connected to the computer test and control program via an AD module. Intelligent computer program control is employed to perform measurements under three different pressures and at standard specified opening degrees.

[0025] Brief description of the usage process: First, three pressures are set. External compressed air enters the pressure regulating valve 10, thus inputting compressed air into the pressure tank 1. The control program written in C# provides a pressure value to the pressure regulating valve 10, which adjusts the pressure in the pressure tank 1. When the pressure changes, the pressure regulating valve 10 automatically adjusts the pressure inside the tank to control the three set pressures for testing. The control program sends commands to the pressure regulating valve 10 via RS485 through the DA module. The pressure regulating valve 10 controls the pressure in the pressure tank 1 according to the commands, so that the medium water in the pressure tank 1 flows to the flow meter 2 under constant pressure. Then, the water in the pressure tank 1 is injected into the pipeline at the set pressure. The flow meter 2 measures the flow rate of the medium, and the temperature sensor 12 measures the temperature of the medium. The front pressure p1 of the control valve 5 under test is adjusted through the front-end shut-off valve 3. Afterwards, the control program sends a 4-20mA control current to the control valve 5 under test via RS485 through the DA module to control the opening degree of the control valve 5 under test; at the same time, the program controls the opening degree of the back-end shut-off valve 8 to ensure that the pressure difference meets the test requirements. Finally, the control program uses the AD module to read the flow rate of flow meter 2, the pressure of front-end pressure sensor 4 and back-end pressure sensor 7 via RS48. The medium flows through the measured control valve 5 and the back-end shut-off valve 8, and the back-end medium pressure p2 is measured. The pressure difference = p1 - p2. The medium flows into the water tank 9 through the pipeline. The control program calculates the pressure difference from the collected front-end pressure p1 and back-end pressure p2, and calculates the Kv value according to the flow calculation formula.

[0026] Then, according to standard GB / T17213, the flow rate of the control valve at each pressure was measured at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% opening, and the Kv value was calculated. The results of the three measurements were averaged, and the flow characteristic curve of flow rate Kv versus control valve opening was plotted.

[0027] The control program reads the displacement data from the displacement sensor. Based on the read data and the corresponding 4-20mA control current, the control program controls the opening degree of the valve under test, performs calculations, and obtains the mechanical characteristics of the valve under test, such as stroke, start and end point deviation, rated stroke error, hysteresis, and dead zone. The control program then plots relevant curves based on the measured data and outputs a test report.

[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A smart flow detection device for a micro-flow control valve, comprising a support frame (13), characterized in that: The support frame (13) has a pressure tank (1) and a water tank (9) bolted to its two sides respectively. A pressure regulating valve (10) is fixedly connected to one side of the top of the pressure tank (1). A flow meter (2) is fixedly connected to the other side of the top of the pressure tank (1) through a pipe. A control valve (5) is installed on the top of the support frame (13). A displacement sensor (6) is bolted to the top of the control valve (5).

2. The intelligent flow detection device for a micro-flow control valve according to claim 1, characterized in that: The control valve under test (5) is connected to a front-end pressure sensor (4) and a rear-end pressure sensor (7) via pipes on both sides near the pressure tank (1) and the water tank (9), respectively. The other ends of the front-end pressure sensor (4) and the rear-end pressure sensor (7) are connected to a front-end shut-off valve (3) and a rear-end shut-off valve (8) via pipes, respectively. A temperature sensor (12) is connected between the front-end shut-off valve (3) and the front-end pressure sensor (4) via pipes. The other end of the front-end shut-off valve (3) is connected to a flow meter (2) via pipes.

3. The intelligent flow detection device for a micro-flow control valve according to claim 2, characterized in that: The other end of the back-end shut-off valve (8) is fixedly connected to a return water pipe (11) used in conjunction with the water tank (9).

4. The intelligent flow detection device for a micro-flow control valve according to claim 2, characterized in that: The pressure regulating valve (10), displacement sensor (6), front-end shut-off valve (3), and rear-end shut-off valve (8) are electrically connected to the computer test control program through the DA module. The flow meter (2), front-end pressure sensor (4), rear-end pressure sensor (7), and displacement sensor (6) are electrically connected to the computer test control program through the AD module.

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