CN110220575A - A kind of device measuring Venturi meter coefficient - Google Patents

Abstract

The invention discloses a device for measuring the flow coefficient of a Venturi flowmeter, which comprises a timer, a water storage tank, a water supply mechanism connected to both ends of the water storage tank and a measuring backflow mechanism, and a device connected between the water supply mechanism and the measuring backflow mechanism. Diversion mechanism; it has good measurement effect and high accuracy. During the whole process of the experiment, the water body can be recycled and used, which can effectively save water resources and reduce water source consumption; improve the utilization rate of water body and have good performance.

Description

A device for measuring flow coefficient of Venturi flowmeter

technical field

The invention relates to the technical field of fluid mechanics, in particular to a device for measuring the flow coefficient of a Venturi flowmeter.

Background technique

Because the laws of motion of liquid flow are very complex, all practical problems cannot be completely solved by theoretical research methods. Many unknown fluid motion laws still need to be explored and discovered through experimental research; the equipment used in the existing Venturi experiment is inconvenient to operate, the measurement effect is poor, the accuracy of the measurement results is low, and it is only suitable for the measurement of small flow rates. low performance.

Contents of the invention

The object of the present invention is to provide a device for measuring the flow coefficient of a Venturi flowmeter to solve the problems of poor measuring effect and low performance of existing measuring equipment.

The technical scheme of the present invention to solve the above-mentioned technical problems is as follows: a device for measuring the flow coefficient of a Venturi flowmeter, comprising a timer, a water storage tank, a water supply mechanism connected to both ends of the water storage tank, a measuring backflow mechanism and a device connected to the water supply mechanism and the diversion mechanism between the measuring return mechanism;

The deflector mechanism includes a first deflector assembly and a second deflector assembly arranged side by side, and each of the first deflector assembly and the second deflector assembly includes a first test tube communicated with the water supply mechanism, and connected to the water supply mechanism. The second test tube communicated with the measuring backflow mechanism and the Venturi tube connected between the first test tube and the second test tube, the Venturi tube is connected with a pressure measuring assembly, and the second test tube is A valve is provided.

Further, the measuring return mechanism includes a collecting box arranged at the upper end of the water storage tank, measuring cylinders respectively located at both ends of the collecting box, a water level probe assembly located above the collecting box, and a water level probe assembly arranged between the measuring cylinder and the water storage tank. The return pipe between, the return pipe is provided with a valve, the bottom end of the water level probe assembly is located in the measuring cylinder, and the end of the second test tube away from the Venturi tube communicates with the measuring cylinder .

Further, the water level probe assembly includes a bracket arranged above the collector box, a sleeve arranged on the bracket, a measuring rod fitted in the sleeve and a measuring needle connected to the bottom end of the measuring rod, the bracket An adjustment knob for controlling the movement of the sleeve is provided at a position where the sleeve is connected, and the end of the measuring needle away from the measuring rod extends into the measuring cylinder.

Further, the collecting box includes a box body arranged at the upper end of the water storage tank, storage chambers located at both ends of the box body, and a residual liquid collection bin located between the storage chambers at both ends, and a measuring cylinder is built in the storage chamber. A drain pipe is arranged between the residual liquid collection bin and the water storage tank.

Further, the end of the second test tube away from the Venturi tube is movably connected with a drain joint, and the end of the drain joint is located in the collecting box.

Further, the water supply mechanism includes a box body in an integrated structure, a water supply chamber located in the box body and communicating with the water storage tank, a water storage chamber located at the upper end of the water supply chamber, and a water supply chamber located at the upper end of the water supply chamber and the water storage tank. An upper water pipe between the cavities, a water pump is connected to the upper water pipe, and the first flow guide assembly and the second flow guide assembly communicate with the water storage chamber respectively.

Further, a partition is provided in the water storage chamber, and the water storage chamber is divided into an overflow area and a backflow area by the partition; a gap is provided on the upper end of the partition, and the The overflow area is communicated with the return area, and the return area is communicated with the water supply chamber, and the first guide assembly and the second guide assembly are respectively communicated with the overflow area.

Further, the pressure measuring assembly includes a pressure measuring tube connected to the Venturi tube and a scale arranged on the outer wall of the box, and the scale and the pressure measuring tube are far away from the end of the Venturi tube Correspondingly; the pressure measuring tube includes a first pressure measuring tube and a second pressure measuring tube, the first pressure measuring tube is connected to the throat of the Venturi tube, and the second pressure measuring tube is connected to the The neck of the Venturi tube, and the end of the first pressure measuring tube away from the Venturi tube and the end of the second pressure measuring tube away from the Venturi tube are respectively located on both sides of the scale.

Further, the end of the pressure measuring tube is provided with a screw joint, and the Venturi tube is provided with a fixed joint matched with the screw joint.

Further, the water storage tank is provided with a water inlet.

The present invention has the following beneficial effects: a device for measuring the flow coefficient of a Venturi flowmeter provided by the present invention has good measurement effect and high accuracy, and a double theoretical flow measurement is formed by the first pressure measuring component and the second pressure measuring component system, effectively improving the accuracy of theoretical flow measurement; by measuring two sets of water level probes in the return mechanism to form a dual actual flow measurement system, effectively improving the accuracy of actual flow measurement; and the water storage tank, water supply mechanism, The diversion mechanism and the measurement return mechanism form a self-circulating water flow system. During the whole process of the experiment, the water body can be recycled and used, which can effectively save water resources and reduce water consumption; , to ensure the reliable and stable performance of the connection between the two; and through the drainage joint at the end of the second test tube, the user can turn the drainage joint according to the need, so as to control the water to be discharged into the measuring cylinder or the residual liquid collection chamber, thereby Improve the accurate control of the inflow of water, and after the test is completed, the drainage joint is aligned with the residual liquid collection chamber, so that the remaining water in the test tube can flow into the water storage tank along the residual liquid collection chamber after the test, improving the water utilization rate, High performance.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the first guide assembly or the second guide assembly in the present invention;

Fig. 3 is the water level probe assembly in the present invention;

Fig. 4 is the schematic diagram of the current collecting box in the present invention;

Fig. 5 is a structural schematic diagram of a water supply mechanism in the present invention;

Figure 6 is an enlarged schematic view of A in Figure 2;

The reference numerals shown in Fig. 1 to Fig. 6 are respectively represented as: 1-water storage tank, 2-water supply mechanism, 3-measurement return mechanism, 4-guiding mechanism, 40-first guiding assembly, 41-second guiding Flow component, 401-first test tube, 402-second test tube, 403-Venturi tube, 5-pressure measuring component, 404-valve, 30-collecting box, 31-gauge cylinder, 32-water level probe assembly, 33-Return pipe, 320-Bracket, 321-Sleeve, 322-Measuring rod, 323-Style needle, 324-Adjusting knob, 301-Box body, 302-Storage chamber, 303-Residual liquid collection bin, 304-Drain pipe , 20-box, 21-water supply chamber, 22-water storage chamber, 23-upper pipe, 220-partition, 221-overflow area, 222-return area, 223-gap, 51-scale, 501-section One pressure measuring tube, 502-second pressure measuring tube, 503-screw joint, 504-fixed joint, 10-water inlet.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

As shown in Figures 1 to 2, a device for measuring the flow coefficient of a Venturi flowmeter includes a timer, a water storage tank 1, a water supply mechanism 2 connected to both ends of the water storage tank 1, a measuring return mechanism 3, and a water supply mechanism connected to 2 and the flow guide mechanism 4 between the measuring backflow mechanism 3. The timer adopts a stopwatch for recording the time of receiving water. The water storage tank 1 is the source of the experimental water body, and the water storage tank 1, the water supply mechanism 2, the diversion mechanism 4 and the measurement return mechanism 3 form a self-circulating water flow system, and the experimental water body circulates and is reused, saving water resources and reducing waste. The water body in the water supply mechanism 2 is delivered to the measurement return mechanism 3 through the diversion mechanism 4, and the theoretical flow rate is measured. The actual flow rate is accurately measured by measuring the backflow mechanism 3 and the pressure measuring component 5, and the actual flow rate of the theoretical flowmeter is accurately measured, thereby realizing the calculation of the Venturi coefficient.

The flow guide mechanism 4 comprises a first flow guide assembly 40 and a second flow guide assembly 41 arranged side by side, the first flow guide assembly 40 and the second flow guide assembly 41 all include a first test tube 401 communicated with the water supply mechanism 2, and a Measure the second test tube 402 connected by the backflow mechanism 3 and the Venturi tube 403 connected between the first test tube 401 and the second test tube 402, the Venturi tube 403 is connected with the pressure measuring assembly 5, the second test tube 402 A valve 404 is provided on it. Two sets of measurement systems are formed by the first flow guide assembly 40 and the second flow guide assembly 41 to improve the accuracy of theoretical flow measurement. The water in the water storage tank 1 flows through the first test tube 401 and the Venturi sequentially through the water supply mechanism 2 The tube 403 , the second test tube 402 and the measurement backflow mechanism 3 finally return to the water storage tank 1 . The pressure measuring assembly 5 includes a pressure measuring tube connected to the Venturi tube 403 and a scale 51 corresponding to the end of the pressure measuring tube away from the Venturi tube 403, and the scale 51 is arranged on the outer wall of the box body 20; The pressure measuring tube includes a first pressure measuring tube 1 and a second pressure measuring tube 2, the first pressure measuring tube 1 is connected to the throat of the Venturi tube 403, and the second pressure measuring tube 2 is connected to the neck of the Venturi tube 403, And the end of the first pressure measuring tube 1 away from the Venturi tube 403 and the end of the second pressure measuring tube 2 away from the Venturi tube 403 are respectively located on both sides of the scale 51 . The height of the water body in the piezometric tube can be measured in real time through the scale 51, so as to measure the theoretical flow rate, which is convenient, reliable and convenient for observation.

Measuring backflow mechanism 3 includes collecting box 30 arranged on the upper end of water storage tank 1, measuring cylinder 31 respectively located at both ends of collecting box 30, water level measuring needle assembly 32 located above collecting box 30 and arranged between measuring cylinder 31 and water storage tank 1. Between the return pipe 33, the return pipe 33 is provided with a valve 404, the bottom end of the water level probe assembly 32 is located in the measuring cylinder 31, and the end of the second test tube 402 away from the Venturi tube 403 communicates with the measuring cylinder 31. The water level measuring needle 323 is the main instrument for experimentally measuring the basic quantity of water level and water surface curve. The water flowing out from the diversion mechanism 4 enters the measuring cylinder 31 for storage, and cooperates with the water level probe assembly 32 to measure and read the liquid level of the water in the measuring cylinder 31 . The valve 404 adopts a flow control valve, which can control the flow rate of the water body flowing into the measuring cylinder 31. During use, the flow control valve controls the different flow rates of the water body to form multiple sets of data under different flow conditions, which helps to improve the flow rate of the water body. The accuracy of the measurement. The used water flows back into the water storage tank 1 through the return pipe 33, so that the water can be recycled. During the experiment, first measure the liquid level height of the water body in the measuring cylinder 31 before the water body flows in by the water level measuring needle 323, as the initial liquid level height, as the experiment continues, the water body continuously flows in. When the liquid level of the water body in 31 is stable, the final liquid level height of the water body liquid level in the measuring cylinder 31 is measured by the water level probe 323, and the actual flow rate can be calculated by the difference between the final liquid level height and the initial liquid level height . When measuring the fluctuating water level, then the highest and lowest water levels in the measuring cylinder 31 should be measured, and the average value should be taken as the average water level.

In order to improve the performance of the water level probe 323, as shown in Figure 3, in the present invention, the water level probe assembly 32 includes a bracket 320 arranged above the collector box 30, a sleeve 321 arranged on the bracket 320, and a sleeve 321 arranged on the The measuring rod 322 in the sleeve 321 and the measuring needle 323 connected to the bottom end of the measuring rod 322 are provided with an adjustment knob 324 for controlling the movement of the sleeve 321 at the position where the bracket 320 meets the sleeve 321, and the measuring needle 323 is far away from the sleeve 321. The end of the measuring rod 322 extends into the measuring cylinder 31 . The bracket 320 is the overall supporting structure of the water level measuring needle assembly 32. The sleeve 321 is installed on the bracket 320. The measuring rod 322 is embedded in the sleeve 321 through the spring piece, and the sleeve 321 is driven up and down by the inner gear plate to move up and down. Adjust the movement of the measuring needle 323 up and down. The scale line is marked on the measuring rod 322, and the reading of the water level can be realized through the scale line. Close to the water surface (do not lift it from the water), until the needle tip just touches the water surface, you can read the height of the water level and realize the measurement of the actual flow.

In order to improve the collection effect of the water body during the experiment, as shown in Figure 4, in the present invention, the collecting box 30 includes a box body 301 arranged on the upper end of the water storage tank 1, a storage chamber 302 located at both ends of the box body 301, and two The residual liquid collection bin 303 between the storage chamber 302 at the end, the storage chamber 302 has a measuring cylinder 31 built in, and a drain pipe 304 is arranged between the residual liquid collection bin 303 and the water storage tank 1 . The measuring cylinder 31 is made of transparent material, which can be plastic material or glass material. The storage chamber 302 improves reliable support and fixation for the measuring cylinder 31, and improves the stability of the measuring cylinder 31 during the experiment; when it is not necessary to supply water in the vector cylinder 31, the end of the second test tube 402 is extended to the residual liquid collection bin 303, The residual water drips into the residual liquid collection chamber 303 and is drained back into the water storage tank 1 through the drain pipe 304 to improve the utilization rate of the water and avoid inaccurate measurement caused by the residual water dripping into the measuring cylinder 31 .

In order to facilitate the rapid switching of the water flow direction between the residual liquid collection bin 303 and the measuring cylinder 31, in the present invention, the end of the second test tube 402 away from the Venturi tube 403 is movably connected with a drain joint 405, and the end of the drain joint 405 Located in the collector box 30. The drain joint 405 is movably connected, and the user can turn the drain joint 405 to the top of the measuring cylinder 31 or the top of the residual liquid collection chamber 303 according to the needs of use, so as to realize the rapid switching of the flow direction of the water body.

In order to improve the performance of the water supply mechanism 2, as shown in FIG. The water storage chamber 22 at the upper end of the chamber 21 and the upper water pipe 23 between the water supply chamber 21 and the water storage chamber 22 are connected to the water pump. The cavities 22 communicate with each other. The water pump is located in the water supply chamber 21, and the water body in the water storage tank 1 is lifted into the water storage chamber 22 through the water supply pipe 23 through the water pump. After the water body in the water storage chamber 22 is constant, the valve 404 is opened for experimental operation.

In order to improve the water circulation effect in the water supply mechanism 2, in the present invention, a partition 220 is arranged in the water storage chamber 22, and the water storage chamber 22 is divided into an overflow area 221 and a backflow area 222 by the partition 220; the partition 220 The upper end is provided with a notch 223, and the overflow area 221 and the return area 222 are communicated through the notch 223, and the return area 222 is communicated with the water supply chamber 21, and the first guide assembly 40 and the second guide assembly 41 are respectively connected to the overflow area. 221 connected. When the water body in the overflow area 221 reaches the position of the gap 223, the excess water flows to the backflow area 222 through the gap 223, and the backflow area 222 is connected with the water supply chamber 21, and then flows into the water supply chamber 21 and returns to the water storage tank 1, forming The water internal circulation system in the water supply mechanism 2 improves the utilization rate of the water body. For the convenience of observation, the side of the overflow area 221 facing the first flow guide assembly 40 or the second flow guide assembly 41 is made of transparent material, so that the capacity of the water body in the overflow area 221 can be observed in real time and the performance of the device can be improved.

In order to improve the reliability of the connection between the pressure measuring tube and the Venturi tube 403, as shown in Figure 6, in the present invention, the end of the pressure measuring tube is provided with a screw joint 503, and the Venturi tube 403 is provided with a Joint 503 is fitted with fixed joint 504 . The inner wall of the screw joint 503 is provided with an internal thread, and the outer wall of the fixed joint 504 is provided with an external thread, and the external thread cooperates with the internal thread to realize the threaded connection between the screw joint 503 and the fixed joint 504. The connection has self-locking performance and improves the connection performance. Stable and reliable, avoid loosening. Moreover, the connection is simple and the operation is convenient.

In order to facilitate the replenishment of water in the water storage tank 1 , in the present invention, the water storage tank 1 is provided with a water inlet 10 . The water body in the water storage tank 1 is supplemented by the external water source through the water inlet 10, thereby forming an external water supply, so that the device itself can not only realize internal circulating water, but also realize auxiliary replenishment from an external water source, and has high usability.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A device for measuring the flow coefficient of a Venturi flowmeter, characterized in that it comprises a timer, a water storage tank (1), a water supply mechanism (2) and a measurement backflow mechanism (3) that are respectively connected to the two ends of the water storage tank (1) And a diversion mechanism (4) connected between the water supply mechanism (2) and the measurement return mechanism (3); The deflector mechanism (4) comprises a first deflector assembly (40) and a second deflector assembly (41) arranged side by side, and the first deflector assembly (40) and the second deflector assembly (41) are both It includes a first test tube (401) communicated with the water supply mechanism (2), a second test tube (402) communicated with the measurement return mechanism (3), and a test tube (401) connected to the first test tube (401) and The Venturi tube (403) between the second test tubes (402), the Venturi tube (403) is connected with the pressure measuring assembly (5), and the second test tube (402) is provided with a valve (404 ). 2. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 1, characterized in that, the measuring backflow mechanism (3) comprises a collecting box (30) arranged at the upper end of the water storage tank (1), The measuring cylinder (31) located at both ends of the collecting box (30), the water level probe assembly (32) located above the collecting box (30), and the measuring cylinder (31) and the water storage tank (1) Between the return pipe (33), the return pipe (33) is provided with a valve (404), the bottom end of the water level probe assembly (32) is located in the measuring cylinder (31), the second test The end of the tube (402) away from the Venturi tube (403) communicates with the graduated cylinder (31). 3. The device for measuring the flow coefficient of a Venturi flowmeter according to claim 2, wherein the water level probe assembly (32) comprises a support (320) arranged above the collector box (30), The sleeve (321) arranged on the bracket (320), the measuring rod (322) fitted in the sleeve (321) and the measuring needle (323) connected to the bottom end of the measuring rod (322), the bracket (320) is provided with an adjustment knob (324) for controlling the movement of the sleeve (321) at the position where it meets the sleeve (321), and the measuring needle (323) is far away from the end of the measuring rod (322) Extend into the graduated cylinder (31). 4. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 3, characterized in that the collector box (30) comprises a box body (301) arranged at the upper end of the water storage tank (1) , the storage cavity (302) located at both ends of the box body (301) and the residual liquid collection bin (303) between the storage cavity (302) at both ends, the storage cavity (302) has a built-in measuring cylinder (31), the A drain pipe (304) is arranged between the residual liquid collection bin (303) and the water storage tank (1). 5. A device for measuring the discharge coefficient of a Venturi flowmeter according to any one of claims 2 to 4, characterized in that, said second test tube (402) moves away from the end of the Venturi tube (403) A drainage joint (405) is connected, and the end of the drainage joint (405) is located in the collecting box (30). 6. The device for measuring the flow coefficient of a Venturi flowmeter according to claim 1, wherein the water supply mechanism (2) comprises a casing (20) in an integrated structure, located in the casing (20) The water supply chamber (21) inside and communicated with the water storage tank (1), the water storage chamber (22) located at the upper end of the water supply chamber (21), and the water supply chamber (21) and the water storage chamber ( 22) between the upper water pipe (23), the upper water pipe (23) is connected with a water pump, the first guide assembly (40) and the second guide assembly (41) are respectively connected with the water storage chamber ( 22) Connected. 7. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 6, characterized in that, a dividing plate (220) is arranged in the water storage chamber (22), and a dividing plate (220) passes through the dividing plate (220). ) divides the water storage chamber (22) into an overflow area (221) and a backflow area (222); the upper end of the partition (220) is provided with a gap (223), so that the gap (223) will The overflow area (221) communicates with the return area (222), and the return area (222) communicates with the water supply chamber (21), and the first guide assembly (40) and the second guide The flow components (41) communicate with the overflow regions (221) respectively. 8. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 6, characterized in that the pressure measuring assembly (5) comprises a pressure measuring tube connected to the Venturi tube (403) and The scale (51) arranged on the outer wall of the box (20), and the scale (51) corresponds to the end of the pressure measuring tube away from the Venturi tube (403); the pressure measuring tube includes The first pressure measuring tube (501) and the second pressure measuring tube (502), the first pressure measuring tube (501) is connected to the throat of the Venturi tube (403), the second pressure measuring tube ( 502) is connected to the neck of the Venturi tube (403), and the first pressure measuring tube (501) is away from the end of the Venturi tube (403) and the second pressure measuring tube (502) is away from the Venturi tube The ends of (403) are respectively located on both sides of the scale (51). 9. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 8, characterized in that, the end of the pressure measuring tube is provided with a screw joint (503), and on the Venturi tube (403) A fixed joint (504) matched with the screw joint (503) is provided. 10. A device for measuring the flow coefficient of a Venturi flowmeter according to claim 9, characterized in that, the water storage tank (1) is provided with a water inlet (10).