Positive displacement flowmeter

Abstract

The utility model provides a kind of volumetric flowmeter, belong to flowmeter technical field, the device includes electrical box, metering tank, communication pedestal, metering jar, upper communication pedestal, overflow pipe, metering pipe, measuring mechanism and controller, optical liquid level sensor can realize detection to liquid level outside metering pipe, avoid direct contact with liquid, reduce the corrosion and pollution of liquid to sensor, improve the service life and the accuracy of measurement of sensor, by setting upper communication pedestal and overflow pipe make the device have good explosion-proof performance, effectively prevent dangerous situation caused by liquid pressure too large or liquid level abnormal rise, the design of entire volumetric flowmeter is compact, structure is reasonable, easy to operate, can satisfy the demand of liquid flow measurement under different occasions, whether in industrial production fluid measurement, or in laboratory scientific research, have wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and in particular to a volumetric flow meter. Background Technology

[0002] In China, various flow meters are commonly used for liquid metering, but most are electromagnetic or turbine-type flow meters. These flow meters suffer from inaccurate measurements at low flow rates, and most of them use mechanical switches and Hall effect switches. Mechanical switches are gradually being phased out due to sealing difficulties and limited lifespan.

[0003] Chinese Patent CN206321286U discloses a volumetric flow meter, comprising a top cover, a middle cylinder, and a bottom cover. The top cover is installed at the upper end of the middle cylinder, and the bottom cover is installed at the lower end. The top cover has an inlet, and the bottom cover has an outlet. A guide post is slidably mounted inside the middle cylinder, guided by a guide tube and coaxially arranged with the middle cylinder. A lifting mechanism for moving the guide post up and down is installed on the bottom cover. A float switch is located in the upper part of the middle cylinder and is connected to a control panel outside the middle cylinder. The advantages of this invention are: convenient to use, simple to operate, unaffected by foam, and volumetric or mass measurement can be performed through the control panel.

[0004] The shortcomings of the above-mentioned existing technical solutions are as follows: a float switch is fixedly connected to the bottom surface of the top cover and is located inside the middle cylinder. As a triggering mechanism when the middle cylinder is full of liquid, the float switch will be in direct contact with the liquid. If the liquid being measured is corrosive, it is easy to cause the triggering mechanism to malfunction, which limits the types of liquid that the liquid flow meter can measure. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a volumetric flow meter to resolve the issues present in the prior art.

[0006] This utility model provides a volumetric flow meter, comprising: The metering box has an installation base fixedly connected to its bottom surface. A connecting base is fixedly connected to the installation base. A metering tank is fixedly connected to the connecting base. An upper connecting seat is fixedly connected to the metering tank. The connecting base and the metering tank are connected to each other. The metering tank and the upper connecting seat are connected to each other. A water inlet pipe is connected to the upper connecting seat. An empty pipe is connected to the connecting base. Metering tube, metering tube metering tank, metering tube upper connecting seat, metering tube connecting base, metering tube measuring mechanism, measuring mechanism main body, an optical liquid level sensor is fixedly installed inside the main body, a detection through hole is opened on the side end of the main body, and the detection end of the optical liquid level sensor is set at the opening of the detection through hole.

[0007] As a further embodiment of this utility model: the upper connecting seat is connected to an overflow pipe.

[0008] As a further embodiment of this utility model, it also includes an electrical box, an installation plate fixedly connected inside the electrical box, a controller fixedly connected to the installation plate, a bracket fixedly connected to the installation plate, and a display screen fixedly connected to the bracket.

[0009] As a further embodiment of this utility model: an electric ball valve is fixedly installed on the drain pipe, and both the electric ball valve and the optical liquid level sensor are electrically connected to the controller.

[0010] As a further embodiment of this utility model: alignment strips are fixedly connected to both sides of the detection through hole on the main body of the mechanism, anti-slip strips are provided on the upper and lower sides of the detection through hole, the anti-slip strips are fixedly connected to the main body of the mechanism, and clamping blocks are fixedly connected to both sides of the main body of the mechanism.

[0011] As a further embodiment of this utility model: a locking strip is fixedly connected to one end face of the two clamping blocks that are close to each other, and a slot corresponding to the locking strip is opened on the outer wall of the metering tube.

[0012] As a further embodiment of this utility model: the electrical box is provided with a cover plate one, and the metering box is provided with a cover plate two.

[0013] As a further embodiment of this utility model: a protective bracket is fixedly connected to the mounting base, and a top plate is fixedly connected above the protective bracket. The connecting base, the metering tank, and the upper connecting seat are all located inside the protective bracket.

[0014] The beneficial effects of this utility model are: 1. In operation, liquid flows from the inlet pipe into the upper connecting seat. Since the upper connecting seat is connected to the metering tank, the liquid flows into the metering tank. As the liquid continues to flow in, the liquid level in the metering tank gradually rises. At the same time, the liquid level in the metering tube also begins to rise. A measuring mechanism is installed on the metering tube. The optical liquid level sensor in the measuring mechanism monitors the liquid level change in the metering tube in real time through the detection through hole. When the liquid level reaches the position of the lower optical liquid level sensor, the timing starts. When the liquid level reaches the upper optical liquid level sensor, the timing ends, recorded as T1. The volume between the upper and lower optical liquid level sensors is preset to V at the factory. The control system calculates the instantaneous flow rate according to the timing T=T1-T0 and V. After the measurement is completed, the system opens the drain pipe to drain the liquid inside. Repeating the liquid accumulation, metering, and draining process can continuously measure the flow rate. This avoids direct contact with the liquid, reduces the corrosion and contamination of the sensor by the liquid, improves the service life of the sensor and the accuracy of the measurement. At the same time, this non-contact detection method also makes the installation and maintenance of the sensor more convenient and reduces the cost of use. 2. The top-in, bottom-out mode of this utility model helps to avoid the influence of water pressure during flow detection, making the measurement results more accurate and the liquid level rise rate more uniform, thus improving the reliability of the measurement. The upper connecting seat is connected to an overflow pipe. When the liquid level in the metering tank exceeds the safe height, the excess liquid can be discharged through the overflow pipe, preventing liquid overflow from damaging the equipment or affecting the measurement results. By setting the upper connecting seat and the overflow pipe, the device has excellent explosion-proof performance, effectively preventing dangerous situations caused by excessive liquid pressure or abnormal rise in liquid level. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a volumetric flow meter according to the present invention; Figure 2 This is a three-dimensional structural diagram of the internal structure of the metering box of a volumetric flow meter according to the present invention. Figure 3 This is a front structural diagram of the internal structure of the metering box of a volumetric flow meter according to the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the measuring mechanism of a volumetric flow meter according to the present invention; Figure 5 This is a three-dimensional structural diagram of the internal structure of the electrical box of a volumetric flow meter according to the present invention.

[0016] List of reference numerals in the attached diagram: 1. Electrical box; 2. Cover plate one; 3. Metering box; 4. Cover plate two; 5. Mounting base; 6. Protective bracket; 7. Connecting base; 8. Metering tank; 9. Upper connecting seat; 10. Water inlet pipe; 11. Overflow pipe; 12. Top plate; 13. Drain pipe; 14. Electric ball valve; 15. Metering tube; 16. Measuring mechanism; 161. Mechanism body; 162. Detection through hole; 163. Alignment strip; 164. Anti-slip strip; 165. Clamping block; 166. Locking strip; 17. Mounting plate; 18. Controller; 19. Bracket; 20. Display screen. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Reference Figures 1 to 5 This utility model provides a volumetric flow meter, including a metering box 3 and a metering tube 15. A mounting base 5 is fixedly connected to the bottom surface inside the metering box 3. A connecting base 7 is fixedly connected to the mounting base 5. A metering tank 8 is fixedly connected to the connecting base 7. An upper connecting seat 9 is fixedly connected to the metering tank 8. The connecting base 7 and the metering tank 8 are connected to each other. The metering tank 8 and the upper connecting seat 9 are connected to each other. An inlet pipe 10 is connected to the upper connecting seat 9. An outlet pipe 13 is connected to the connecting base 7. The metering tube 15 is connected to the metering tank 8. The upper connecting seat 9 is connected to the metering tube 15. The metering tube 15 is connected to the base 7. The metering tube 15 is a measuring mechanism 16. The measuring mechanism 16 has a main body 161. An optical liquid level sensor is fixedly installed inside the main body 161. A detection through hole 162 is opened on the side of the main body 161. The detection end of the optical liquid level sensor is set at the opening of the detection through hole 162.

[0021] During operation, liquid enters the upper connecting seat 9 from the inlet pipe 10. Since the upper connecting seat 9 is connected to the metering tank 8, the liquid flows into the metering tank 8. As the liquid continues to flow in, the liquid level in the metering tank 8 gradually rises. At the same time, the liquid level in the metering tube 15 begins to rise. A measuring mechanism 16 is installed on the metering tube 15. The optical liquid level sensor in the measuring mechanism 16 monitors the liquid level change in the metering tube 15 in real time through the detection through-hole 162. When the liquid level reaches the position of the lower optical liquid level sensor, timing starts T0=0 (unit: s). When the liquid level reaches the upper optical liquid level sensor, timing ends, recorded as T1 (unit: s). The volume between the upper and lower optical liquid level sensors is preset to V (mL) at the factory. The control system calculates the instantaneous flow rate according to the timing T=T1-T0 and V. After the measurement is completed, the system opens the drain pipe 13 to drain the internal liquid. The process of liquid accumulation, metering and draining can be repeated to continuously measure the flow rate. The optical liquid level sensor can detect the liquid level outside the metering tube 15, avoiding direct contact with the liquid, reducing the corrosion and contamination of the sensor by the liquid, improving the service life of the sensor and the accuracy of the measurement. At the same time, this non-contact detection method also makes the installation and maintenance of the sensor more convenient and reduces the cost of use.

[0022] The structural design of the upper connecting seat 9 helps the liquid flow smoothly into the metering tank 8, reducing the impact and fluctuations during the liquid flow process, making the liquid level rise more uniform and improving the reliability of the measurement. The upper connecting seat 9 is connected to the overflow pipe 11. When the liquid level in the metering tank 8 exceeds the safe height, the excess liquid can be discharged through the overflow pipe 11 to avoid liquid overflow causing equipment damage or affecting the measurement results. By setting the upper connecting seat 9 and the overflow pipe 11, the device has good explosion-proof performance and effectively prevents dangerous situations caused by excessive liquid pressure or abnormal liquid level rise.

[0023] A volumetric flow meter also includes an electrical box 1. A mounting plate 17 is fixedly connected inside the electrical box 1. A controller 18 is fixedly connected to the mounting plate 17. A bracket 19 is fixedly connected to the mounting plate 17, and a display screen 20 is fixedly connected to the bracket 19. The display screen 20 is used to display real-time information such as the liquid flow rate and liquid level measured by the flow meter, allowing operators to intuitively understand the operating status of the device. An electric ball valve 14 is fixedly installed on the drain pipe 13. The electric ball valve 14 and the optical liquid level sensor are both electrically connected to the controller 18. The controller 18 acts as the controller for the entire flow meter. The core of the system is to precisely control the opening and closing of the electric ball valve 14 on the drain pipe 13 based on the signal transmitted by the liquid level sensor, so as to realize the automation of the liquid storage, metering and discharge process. When the optical liquid level sensor detects that the liquid level has reached the set value and completes data recording, the controller 18 will issue a command to open the electric ball valve 14 to quickly drain the liquid in the metering tank 8 and the metering pipe 15. After the draining is completed, the electric ball valve 14 will automatically close, waiting for the next liquid storage and metering process. The automated draining control method improves the efficiency of flow measurement and reduces the error of manual operation.

[0024] Meanwhile, the controller 18 can also process and analyze the measurement data and transmit the processed data to the display screen 20 for display. The electrical box 1 is equipped with a cover plate 2. The electrical box 1 and the cover plate 2 provide a relatively safe and stable working environment for electrical components such as the controller 18 and the display screen 20, effectively preventing external dust, moisture and other factors from damaging the electrical components.

[0025] The volumetric flow meter features a compact and rational design, is simple and convenient to operate, and can meet the needs of liquid flow measurement in various situations. It has broad application prospects in both industrial fluid measurement and laboratory research.

[0026] Alignment strips 163 are fixedly connected to both sides of the detection through-hole 162 on the main body 161 of the mechanism. Anti-slip strips 164 are provided on the upper and lower sides of the detection through-hole 162, and the anti-slip strips 164 are fixedly connected to the main body 161 of the mechanism. Clamping blocks 165 are fixedly connected to both sides of the main body 161 of the mechanism. A retaining strip 166 is fixedly connected to the end face of the two clamping blocks 165 that are close to each other. A retaining groove corresponding to the retaining strip 166 is opened on the outer wall of the measuring tube 15. By setting the alignment strips 163, the measuring mechanism 16 and the outer arc surface of the measuring tube 15 can be more closely fitted, thereby improving the accuracy of the measurement. The presence of the anti-slip strips 164 can increase the friction between the measuring mechanism 16 and the measuring tube 15, preventing the measuring mechanism 16 from sliding or shifting during the measurement process, and further ensuring... For measurement stability, the clamp 165 and the retaining strip 166 serve to fix the measuring mechanism 16. The retaining strip 166 can be locked into the corresponding slot in the metering tube 15, so that the measuring mechanism 16 is firmly installed on the metering tube 15 and is not easy to fall off. This makes the connection between the measuring mechanism 16 and the metering tube 15 tighter and more reliable, ensuring that the measuring mechanism 16 can continuously and accurately detect the liquid condition in the metering tube 15 during the operation of the volumetric flow meter. This provides a strong guarantee for the accurate measurement of the entire flow meter. At the same time, it also facilitates the installation and disassembly of the measuring mechanism 16. When it is necessary to maintain, repair or replace the measuring mechanism 16, the operator can complete the operation more easily, improving the maintainability and efficiency of the equipment.

[0027] The metering box 3 is equipped with a cover plate 4, which is sealed to the metering box 3 to effectively prevent external dust, moisture and other impurities from entering the metering box 3, thereby avoiding damage to the components inside the metering box 3 or affecting its normal operation.

[0028] A protective bracket 6 is fixedly connected to the mounting base 5, and a top plate 12 is fixedly connected above the protective bracket 6. The connecting base 7, the metering tank 8, and the upper connecting seat 9 are all set inside the protective bracket 6. The protective bracket 6 provides stable support and reliable protection for the connecting base 7, the metering tank 8, and the upper connecting seat 9, and can prevent them from being hit and disturbed by the outside world.

[0029] Workflow: Liquid enters the upper connecting seat 9 from the inlet pipe 10. Since the upper connecting seat 9 is connected to the metering tank 8, the liquid flows into the metering tank 8. As the liquid continues to flow in, the liquid level in the metering tank 8 gradually rises. At the same time, the liquid level in the metering tube 15 begins to rise. A measuring mechanism 16 is installed on the metering tube 15. The optical liquid level sensor in the measuring mechanism 16 monitors the liquid level change in the metering tube 15 in real time through the detection through-hole 162. When the liquid level reaches the position of the lower optical liquid level sensor, timing starts T0=0 (unit: s). When the liquid level reaches the upper optical liquid level sensor, timing ends, recorded as T1 (unit: s). The volume between the upper and lower optical liquid level sensors is preset to V (mL) at the factory. The control system calculates the instantaneous flow rate according to the timing T=T1-T0 and V. After the measurement is completed, the system opens the drain pipe 13 to drain the internal liquid. The process of liquid accumulation measurement and discharge can be repeated to continuously measure the flow rate. The optical liquid level sensor can detect the liquid level outside the metering tube 15, avoiding direct contact with the liquid, reducing the corrosion and contamination of the sensor by the liquid, improving the service life of the sensor and the accuracy of the measurement. At the same time, this non-contact detection method also makes the installation and maintenance of the sensor more convenient and reduces the cost of use. The structural design of the upper connecting seat 9 helps the liquid flow smoothly into the metering tank 8, reducing the impact and fluctuations during the liquid flow process. The top-in, bottom-out mode helps to avoid the influence of water pressure during flow detection, making the measurement results more accurate and the liquid level rise rate more uniform, thus improving the reliability of the measurement. The upper connecting seat 9 is connected to an overflow pipe 11. When the liquid level in the metering tank 8 exceeds the safe height, the excess liquid can be discharged through the overflow pipe 11, preventing liquid overflow from damaging the equipment or affecting the measurement results. By setting the upper connecting seat 9 and the overflow pipe 11, the device has excellent explosion-proof performance, effectively preventing dangerous situations caused by excessive liquid pressure or abnormal rise in liquid level.

[0030] It should be noted that not all steps and modules in the above processes and system structure diagrams are mandatory; some steps or modules may be omitted as needed. The execution order of each step is not fixed and can be adjusted as required. The system structure described in the above embodiments can be a physical structure or a logical structure. That is, some modules may be implemented by the same physical entity, or some modules may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0031] In the above embodiments, the hardware modules can be implemented mechanically or electrically. The present invention has been described and illustrated in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above embodiments, those skilled in the art will understand that more embodiments of the present invention can be obtained by combining the code review methods in the different embodiments described above, and these embodiments are also within the protection scope of the present invention.

Claims

1. A volumetric flow meter, characterized in that, include: Metering box (3), with mounting base (5) fixedly connected to the bottom of the inside of metering box (3), with connecting base (7) fixedly connected to the mounting base (5), with metering tank (8) fixedly connected to the connecting base (7), with upper connecting seat (9) fixedly connected to the metering tank (8), with connecting base (7) and metering tank (8) connected to each other, with metering tank (8) and upper connecting seat (9) connected to each other, with water inlet pipe (10) connected to the upper connecting seat (9), and with drain pipe (13) connected to the connecting base (7). Metering tube (15), metering tube (15) metering tank (8), metering tube (15) upper connecting seat (9), metering tube (15) connecting base (7), metering tube (15) measuring mechanism (16), measuring mechanism (16) main body (161), an optical liquid level sensor is fixedly installed inside the main body (161), and a detection through hole (162) is opened on the side of the main body (161), and the detection end of the optical liquid level sensor is set at the opening of the detection through hole (162).

2. The volumetric flow meter according to claim 1, characterized in that, The upper connecting seat (9) is connected to the overflow pipe (11).

3. A volumetric flow meter according to claim 1, characterized in that, It also includes an electrical box (1), an installation plate (17) is fixedly connected inside the electrical box (1), a controller (18) is fixedly connected on the installation plate (17), a bracket (19) is fixedly connected on the installation plate (17), and a display screen (20) is fixedly connected on the bracket (19).

4. A volumetric flow meter according to claim 3, characterized in that, An electric ball valve (14) is fixedly installed on the drain pipe (13). The electric ball valve (14) and the optical liquid level sensor are both electrically connected to the controller (18).

5. A volumetric flow meter according to claim 1, characterized in that, Alignment strips (163) are fixedly connected to both sides of the detection through hole (162) on the main body of the mechanism (161). Anti-slip strips (164) are provided on the upper and lower sides of the detection through hole (162). The anti-slip strips (164) are fixedly connected to the main body of the mechanism (161). Clamping blocks (165) are fixedly connected to both sides of the main body of the mechanism (161).

6. A volumetric flow meter according to claim 5, characterized in that, Two clamping blocks (165) are fixedly connected to a clamping strip (166) on one side of their close proximity. A groove corresponding to the clamping strip (166) is provided on the outer wall of the metering tube (15).

7. A volumetric flow meter according to claim 3, characterized in that, The electrical box (1) is equipped with a cover plate one (2), and the metering box (3) is equipped with a cover plate two (4).

8. A volumetric flow meter according to claim 1, characterized in that, A protective bracket (6) is fixedly connected to the mounting base (5), and a top plate (12) is fixedly connected above the protective bracket (6). The connecting base (7), the metering tank (8), and the upper connecting seat (9) are all located inside the protective bracket (6).

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