A micro flow rate detection device

Abstract

The utility model discloses a kind of micro flow detection devices, detection device middle part is set to weighing platform, weighing mechanism is connected in weighing platform lower, sliding table is equipped on weighing platform, the end of sliding table is connected with cylinder, sliding table connects measured piece, measured piece is connected with liquid inlet mechanism, weighing mechanism is connected with liquid discharge mechanism;High-precision weighing sensor is used as core measuring element, sliding table displacement is adjusted by cylinder, so that connecting pipe can move on notch, move to notch when measuring, when emptying, connecting pipe is moved to notch outside, emptying design is carried out, so that device can be cyclically switched between measurement and emptying mode, avoid the error caused by traditional flowmeter mechanical transmission, friction and other factors, measurement result is directly traced to quality standard, while also overcome the shortcoming that traditional weighing method cannot continuously measure.Response speed is fast, adaptability is strong, not affected by physical properties such as fluid viscosity, conductivity, suitable for a variety of types of fluid.

Description

Technical Field

[0001] This utility model relates to the field of fluid measurement technology, and in particular to a high-precision, high-stability micro-flow detection device, which is suitable for the accurate measurement and calibration of continuous or intermittent flow rates of trace liquids or high-precision fluids in laboratories, chemical, aviation, aerospace and other industries. Background Technology

[0002] Currently, the main methods for measuring minute flow rates are the flow meter method and the volumetric method. These methods have some inherent drawbacks: flow meters are expensive and sensitive to installation conditions; turbine flow meters experience a significant decrease in accuracy at minute flow rates and are greatly affected by fluid properties; and the volumetric method suffers from mechanical friction and leakage, making it difficult to achieve ultra-high precision measurements.

[0003] The gravimetric method is widely recognized as one of the most accurate and direct methods for flow measurement, and it is often used to calibrate other types of flow meters. However, traditional gravimetric detection devices are typically bulky, have slow dynamic response, and cannot achieve continuous fluid measurement. Furthermore, during the measurement process, the continuous injection of liquid into the weighing container causes changes in its mass, resulting in continuous displacement of the load cell and introducing measurement errors. In addition, environmental vibrations, temperature fluctuations, and other factors can also significantly interfere with the weighing results.

[0004] Therefore, there is an urgent need for a micro-flow detection device that can achieve continuous, online, high-precision, and highly interference-resistant operation. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a micro-flow detection device, which aims to solve the problem that traditional weighing detection devices are bulky and that the continuous displacement of the weighing sensor due to the change in mass caused by the continuous injection of liquid into the weighing container leads to measurement errors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A micro-flow detection device includes a weighing platform in the middle of the device, multiple slots inside the weighing platform, a weighing mechanism connected to the slots, a slide on the weighing platform, a cylinder connected to the end of the slide, multiple connecting pipes spaced apart on the slide, the multiple connecting pipes being connected to the test piece, the test piece being connected to a liquid inlet mechanism, a liquid outlet mechanism connected to the weighing mechanism, and both the liquid inlet mechanism and the liquid outlet mechanism being connected to an oil tank.

[0007] Furthermore, the weighing mechanism includes a weighing sensor and a weighing container. The weighing container is connected to the slot through a pipe. The weighing sensor is located at the bottom of the weighing container. A draining mechanism is connected to the weighing container. The weighing sensor is fixed by feet.

[0008] Furthermore, the draining mechanism includes a drain solenoid valve and an oil drain pipe. One end of the oil drain pipe is connected to the weighing container, and the other end is connected to the oil tank. The drain solenoid valve is located on the oil drain pipe.

[0009] Furthermore, an electromagnetic reversing valve is connected to the cylinder, and the electromagnetic reversing valve is connected to the intake device through the cylinder filter and the pressure reducing valve.

[0010] Furthermore, the liquid inlet mechanism includes an oil pump, a safety valve, a filter, and a flow regulating valve. One end of the oil pump is connected to the oil tank, and the other end is connected to the test piece through the oil pump filter. A safety valve and a flow regulating valve are also provided between the oil pump and the oil tank.

[0011] Furthermore, a pressure sensor is also installed at the liquid inlet end of the tested component.

[0012] The technical solution adopted in this utility model has the following beneficial effects: This application employs a high-precision weighing sensor as the core measuring element. The displacement of the slide is adjusted via a cylinder, allowing the connecting pipe to move across the slot. During measurement, the pipe moves to the slot opening; during venting, the pipe moves outside the slot for venting. This design enables the device to cyclically switch between measurement and venting modes, avoiding errors caused by mechanical transmission and friction in traditional flowmeters. Measurement results are directly traceable to quality standards, and the design overcomes the limitation of traditional weighing methods in continuous measurement. It features fast response, strong adaptability, and is unaffected by fluid viscosity, conductivity, or other physical properties, making it suitable for various types of fluids. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the micro-flow detection device of this utility model; Reference numerals in the attached diagram: 1. Oil tank, 2. Oil pump, 3. Safety valve, 4. Flow regulating valve, 5. Oil pump filter, 6. Pressure sensor, 7. Connecting pipe, 8. Slide table, 9. Cylinder, 10. Solenoid directional valve, 11. Pressure reducing valve, 12. Cylinder filter, 13. Weighing container, 14. Weighing sensor, 15. Base, 16. Solenoid valve, 17. Drain pipe, 18. Foot, 19. Weighing platform, 20. Groove. Detailed Implementation

[0014] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0015] A micro-flow detection device includes a weighing platform 19 in the middle of the detection device. The weighing platform 19 has multiple slots 20 inside, and a weighing mechanism is connected to the slots 20. A slide 8 is provided on the weighing platform 19, and a cylinder 9 is connected to the end of the slide 8. Multiple connecting pipes 7 are spaced apart on the slide 8 and are connected to the test piece. The test piece is connected to a liquid inlet mechanism, and a liquid outlet mechanism is connected to the weighing mechanism. Both the liquid inlet mechanism and the liquid outlet mechanism are connected to an oil tank 1.

[0016] The weighing mechanism includes a weighing sensor 14 and a weighing container 13. The weighing container 13 is connected to the slot 20 through a pipeline. The weighing sensor 14 is located at the bottom of the weighing container 13. A draining mechanism is connected to the weighing container 13. The weighing sensor 14 is fixed by a foot 18.

[0017] The liquid inlet mechanism includes an oil pump 2, a safety valve 3, a filter, and a flow regulating valve 4. One end of the oil pump 2 is connected to the oil tank 1, and the other end is connected to the test piece through the oil pump 2 filter. A safety valve 3 and a flow regulating valve 4 are also provided between the oil pump 2 and the oil tank 1.

[0018] The draining mechanism includes a draining solenoid valve 16 and an oil drain pipe 17. One end of the oil drain pipe 17 is connected to the weighing container 13, and the other end is connected to the oil tank 1. The draining solenoid valve 16 is located on the oil drain pipe.

[0019] In this embodiment, an electromagnetic reversing valve 10 is connected to the cylinder 9, and the electromagnetic reversing valve 10 is connected to the air intake device through the cylinder filter 12 and the pressure reducing valve 11.

[0020] In this embodiment, a pressure sensor 6 is also provided at the liquid inlet end of the test piece.

[0021] The present invention will be further described below with reference to the accompanying drawings: like Figure 1 As shown, a micro-flow detection device comprises a base, a fluid switching mechanism, a weighing mechanism, a liquid inlet mechanism, and a liquid outlet mechanism; In practical implementation, a base 15 is set under the weighing platform 19. The base 15 serves as the main support for the entire device, and fixed feet 18 are installed at its bottom to enhance the support capacity.

[0022] The fluid switching mechanism includes a cylinder 9, a slide 8, a solenoid directional valve 10, a cylinder filter 12, a pressure reducing valve 11, and a connecting pipe 7. One end of the connecting pipe 7 is connected to the test piece, and the other end is connected to the slide 8. The extension and retraction of the cylinder 9 drives the slide 8 to move, thereby switching the outlet of the connecting pipe 7 onto the weighing container 13. This avoids the problem of continuous displacement of the weighing sensor caused by the continuous injection of liquid into the weighing container during the measurement process in traditional detection devices, which introduces measurement errors.

[0023] The weighing mechanism includes a weighing sensor 14 and a weighing container 13. The weighing sensor 14 is fixed on the base 15, and its measuring end is connected to the weighing container 13 through the slide table 8. It is used to measure the mass change of the weighing container 13 in real time. The weighing sensor 14 is a high-precision sensor to improve the detection accuracy of the device. In this embodiment, the measurement accuracy of the weighing sensor 14 is not less than 0.3 mg.

[0024] In specific implementation, a drain solenoid valve can be installed at the bottom of the weighing container 13. When the liquid in the weighing container 13 reaches a preset volume, the solenoid valve is controlled to open and drain the liquid.

[0025] The liquid inlet mechanism includes an oil tank 1, an oil pump 2, a safety valve 3, an oil pump filter 5, a flow regulating valve 4, and a pressure sensor 6, which are used to provide stable pressure and flow output during measurement.

[0026] Oil pump 2 draws oil from oil tank 1, and after passing through oil pump filter 5 and pressure sensor 6, it enters the test piece. The flow rate is regulated by the flow regulating valve 4 of the branch. A safety valve 3 is installed at the outlet of oil pump 2 to set the system pressure. The safety valve 3, flow regulating valve 4 and pressure sensor 6 can ensure stable pressure and flow rate entering the test piece.

[0027] The drainage mechanism includes a drainage solenoid valve 16 and an oil drain pipe 17. In actual use, the weighing value is first set based on the actual situation. When the mass in the weighing container 13 reaches the set weighing value, the cylinder 9 pushes the slide 8 to switch the connection pipe for drainage. At this time, the solenoid valve 16 is opened to drain the fluid in the weighing container 13. After drainage, the solenoid valve 16 is closed, and the device can enter the measurement stage again, repeating the cycle.

[0028] Operating principle of the micro-flow detection device: Test preparation: The oil enters the test piece through oil pump 2, oil pump filter 5, and pressure sensor 6, and returns to oil tank 1 through connecting pipe 7 and slide table 8. The weighing sensor 14 is then zeroed.

[0029] Measurement process: The external control system issues a command, and the cylinder 9 drives the slide 8 to move so that the outlet of the connecting pipe switches to the weighing container 13 position, and the measurement timing begins.

[0030] Emptying process: When the mass in weighing container 13 reaches the set value, the slide table 8 and cylinder 9 are switched, and the solenoid valve 16 is opened to empty the fluid in weighing container 13. After emptying, the solenoid valve 16 is closed, and the device can enter the measurement stage again, repeating the cycle.

[0031] This invention employs a high-precision weighing sensor as the core measuring element. A cylinder adjusts the slide displacement, allowing the connecting pipe to move across the slot. During measurement, the pipe moves to the slot opening; when not measuring and purging, it moves outside the slot for purging. This design allows the device to cycle between measurement and purging modes, avoiding errors caused by mechanical transmission and friction in traditional flowmeters. Measurement results are directly traceable to quality standards, and it overcomes the limitation of traditional weighing methods in continuous measurement. It features fast response, strong adaptability, and is unaffected by fluid viscosity, conductivity, or other physical properties, making it suitable for various types of fluids.

Claims

1. A micro-flow detection device, characterized in that, The middle part of the testing device is set as a weighing platform (19), and the weighing platform (19) is provided with multiple slots (20). A weighing mechanism is connected to the slots (20). A slide (8) is provided on the weighing platform (19). A cylinder (9) is connected to the end of the slide (8). Multiple connecting pipes (7) are provided at intervals on the slide (8). Multiple connecting pipes (7) are connected to the test piece. The test piece is connected to a liquid inlet mechanism. A liquid outlet mechanism is connected to the weighing mechanism. Both the liquid inlet mechanism and the liquid outlet mechanism are connected to the oil tank (1).

2. The micro-flow detection device according to claim 1, characterized in that, The weighing mechanism includes a weighing sensor (14) and a weighing container (13). The weighing container (13) is connected to the slot (20) through a pipe. The weighing sensor (14) is located at the bottom of the weighing container (13). A draining mechanism is connected to the weighing container (13). The weighing sensor (14) is fixed by a foot (18).

3. The micro-flow detection device according to claim 2, characterized in that, The draining mechanism includes a draining solenoid valve (16) and an oil drain pipe (17). One end of the oil drain pipe (17) is connected to the weighing container (13), and the other end is connected to the oil tank (1). The draining solenoid valve (16) is located on the oil drain pipe.

4. The micro-flow detection device according to claim 1, characterized in that, A solenoid directional valve (10) is connected to the cylinder (9), and the solenoid directional valve (10) is connected to the intake device through the cylinder filter (12) and the pressure reducing valve (11).

5. The micro-flow detection device according to claim 1, characterized in that, The liquid inlet mechanism includes an oil pump (2), a safety valve (3), a filter, and a flow regulating valve (4). One end of the oil pump (2) is connected to the oil tank (1), and the other end is connected to the test piece through the oil pump (2) filter. A safety valve (3) and a flow regulating valve (4) are also provided between the oil pump (2) and the oil tank (1).

6. The micro-flow detection device according to claim 1, characterized in that, The liquid inlet end of the test piece is also equipped with a pressure sensor (6).

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