CN206040067U - An Improved Experimental Device for Water Head Loss Along the Way - Google Patents

Abstract

The utility model discloses a modified frictional head loss experimental apparatus, include test bench, storage water tank, water pump, water injection case, follow journey experimental facility, flood peak test test tube, outlet valve door and return water pipe, still include flood peak measuring head, capacitanc level sensor and converting circuit and liquid crystal display, flood peak test in vitro is located to the flood peak measuring head, and the upper end and the capacitanc level sensor of flood peak measuring head are connected, and capacitanc level sensor and converting circuit and liquid crystal display are connected, and the flood peak measuring head is capacitance level gauge. Compared with the prior art, the beneficial effects of the utility model are that: actual operation nature is strong, degree of automation is high, adopt the electron to gather the reading, and can effective solution rely on naked eye and ruler reading and the problem that the data precision is not high that wastes time and energy can be assembled in teaching place such as schools on a large scale in the past.

Description

An Improved Experimental Device for Water Head Loss Along the Way

technical field

The utility model relates to an improved experimental device for water head loss along the way.

Background technique

In the existing teaching experiment device for water head loss along the way, the measurement of water head loss is expressed according to the height difference of the water column in the pressure difference meter along the way, and the height of the water column is measured by a ruler.

During the use of the existing teaching experiment device for water head loss along the way, the following problems will arise: 1. Using a ruler to measure the height of the water column needs to be kept parallel to the lowest point of the concave liquid surface, but in practice, errors will occur in human eye observation; 2. Since the water in the experiment is in a state of continuous flow, the height of the water column in the differential pressure gauge is constantly fluctuating up and down, which is not conducive to reading a more accurate average value; 3. When there are many positions to be measured, it will cost It takes a lot of time to read, and the efficiency of the experiment is low.

Utility model content

The problem to be solved by the utility model is to provide an improved water head loss experimental device along the way, which can conveniently measure the experimental data, in view of the above-mentioned prior art measurement errors and labor-intensive deficiencies.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

An improved experimental device for water head loss along the course, including a test bench, a water storage tank, a water pump, a water injection tank, an along-course test pipe, a water head test tube, a water outlet valve and a water return pipe; the water injection tank is connected with the along-course test pipe, There are at least two water head test tubes connected side by side on the test pipeline, and the water outlet valve is connected to the end of the test pipeline along the way, the water in the test pipeline along the way is returned to the water storage tank through the return water pipeline, and the water in the water storage tank is pumped in by the water pump In the water injection tank, it also includes a water head test head, a capacitive liquid level sensor, a conversion circuit and a liquid crystal display. The sensor is connected with the conversion circuit and the liquid crystal display screen, and the water head test head is a capacitive liquid level gauge.

There is a water inlet valve between the water injection tank and the test pipeline along the way.

There is an open and enlarged part where the return pipe connects to the test pipe along the way.

There are partitions A and B in the water injection tank, the wall of the water injection tank is higher than the partition A, and the partition A is higher than the partition B, the partition A divides the water injection tank into room I and room II, and the partition B divides the water injection tank Room II is divided into Room III and Room IV, and the cavity between partition A and partition B is Room III. The water injection pipe connected to the water pump is set at the bottom of Room III, and the experimental pipeline along the way is connected to the side wall of Room IV.

An overflow pipe is also connected between the water injection tank and the water storage tank, and the overflow pipe is connected to the bottom of the I room.

There are flow meters on the experimental pipeline along the way.

Compared with the prior art, the beneficial effect of the utility model is: the use of the capacitive liquid level sensor to measure the height of the water column in the differential pressure gauge can ensure the accuracy of the data, improve the experimental efficiency, and facilitate the arrangement of later experimental data , strong practicality, high degree of automation, and electronic collection of readings, which can effectively solve the problem of time-consuming and labor-intensive data accuracy that was previously dependent on naked eyes and ruler readings, and can be assembled in schools and other teaching places on a large scale.

Description of drawings

Fig. 1 is the structural representation of the improved head loss test device along the way of the utility model;

FIG. 2 is a partially enlarged schematic diagram of F in FIG. 1 .

Among them, 1-water injection tank, 2-along the test pipeline, 3-return water pipeline, 4-water head test head, 5-water head test tube, 6-capacitive liquid level sensor, 7-conversion circuit and liquid crystal display, 8 -water pump, 9-water storage tank, 10-water outlet valve.

detailed description

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1-2, an improved experimental device for water head loss along the course includes a test bench, a water storage tank, a water pump, a water injection tank, an along-course test pipeline, a water head test tube, a water outlet valve and a water return pipeline; the water injection tank and The test pipes along the course are connected, and there are at least two test tubes for testing water head connected side by side on the test pipes along the course. The tail end of the test pipes along the course is connected to the water outlet valve. In order to recycle the water body and save water, the water in the water storage tank is pumped into the water injection tank through the water pump. It also includes a water head test head, a capacitive liquid level sensor, a conversion circuit and a liquid crystal display. The water head test head is set in the water head test tube. The upper end of the water head test head is connected with the capacitive liquid level sensor, the capacitive liquid level sensor is connected with the conversion circuit and the liquid crystal display, and the water head test head is a capacitive liquid level gauge.

There is a water inlet valve between the water injection tank and the test pipeline along the way.

There is an open and enlarged part where the return pipe connects to the test pipe along the way.

There are partitions A and B in the water injection tank, the wall of the water injection tank is higher than the partition A, and the partition A is higher than the partition B, the partition A divides the water injection tank into room I and room II, and the partition B divides the water injection tank Room II is divided into Room III and Room IV, and the cavity between partition A and partition B is Room III. The water injection pipe connected to the water pump is set at the bottom of Room III, and the experimental pipeline along the way is connected to the side wall of Room IV.

An overflow pipe is also connected between the water injection tank and the water storage tank, and the overflow pipe is connected to the bottom of the I room.

There are flow meters on the experimental pipeline along the way.

The specific usage method is as follows:

Turn on the power, calibrate the conversion circuit and the reading of the liquid crystal display 7, then turn on the water pump 8, fill the water tank 1 from the water storage tank 9, and when the water level reaches the height beyond the partition B in the water injection tank 1, start to flow into the test along the process Pipeline 2, after the water flow is stable, start to read the readings of the conversion circuit and the liquid crystal display screen 7 corresponding to each measuring point, and record the reading as the total water head at each measuring point. The flow rate is adjusted by adjusting the opening of the water outlet valve 10, and the flow rate can be obtained through the flow meter, so the relationship between the flow rate and the water head loss along the way can be conveniently analyzed.

The working principle of the utility model is as follows: by setting water head measuring points at various places along the experimental pipeline, the flow velocity and pressure head at the measuring point i are converted into the water column height H _i under still water, and H _i represents the water head at the measuring point i . total head. A capacitive liquid level sensor is placed in the water head test tube, which can convert the height of the water head into an electronic signal, and display the corresponding reading N _i on the LCD screen through the conversion circuit. By adjusting the circuit setting, N _i =H _i , From this, the total water head at the measuring point i can be easily obtained. Knowing the distance l _i between two adjacent measuring points, and the corresponding total water head H _i , H _i+1 , the hydraulic gradient J can be calculated by the following formula:

J=(H _i+1 -H _i )/l _i ;

The capacitive liquid level sensor uses the relationship between the coverage area of the two electrodes of the sensor to change with the liquid level of the measured liquid, which causes the change of electricity consumption to measure the liquid level.

The existing capacitive liquid level sensor converts the change of the non-electric quantity into the change of the capacitance, informatizes the required data, and can use the computer for further large-scale data processing and calculation. At the same time, it also has the following advantages: 1. High sensitivity; 2. Simple structure; 3. Small size; 4. Good dynamic response; 5. Good high-frequency characteristics; 6. Can work in harsh environments.

Inspired by the above-mentioned ideal embodiment according to the utility model, and through the above-mentioned description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (6)

1. a kind of improved frictional head loss experimental provision, including testing stand, storage tank, water pump, water injecting tank, along journey experiment tube Road, head test tube, flowing water Valve and water return pipeline；Water injecting tank be connected along journey experimental channel, along journey experimental channel simultaneously Row is connected with least two head test tubes, along the tail end connection flowing water Valve of journey experimental channel, along journey experimental channel Water is returned in storage tank by water return pipeline, and the water in storage tank is pumped in water injecting tank by water pump, it is characterised in that：Also include Head measuring head, capacitance level transducer and change-over circuit and LCDs, head measuring head are located at head test tube Interior, the upper end of head measuring head is connected with capacitance level transducer, capacitance level transducer and change-over circuit and liquid crystal Display screen connects, and head measuring head is capacitance level gauge.

2. improved frictional head loss experimental provision according to claim 1, it is characterised in that：Water injecting tank with along journey reality Test.

3. improved frictional head loss experimental provision according to claim 1, it is characterised in that：Water return pipeline is connected edge Open bulb is provided with journey experimental channel.

4. improved frictional head loss experimental provision according to claim 1, it is characterised in that：Be provided with water injecting tank every Water injecting tank is divided into I Room and II Room higher than dividing plate A, dividing plate A higher than dividing plate B, dividing plate A by plate A and dividing plate B, water injecting tank tank wall, II Room is divided into III Room and IV Room by dividing plate B, and the cavity between dividing plate A and dividing plate B is III Room, and the water injection pipe being connected with water pump is set In III Room bottom, IV Room side wall is connected to along journey experimental channel.

5. improved frictional head loss experimental provision according to claim 4, it is characterised in that：Water injecting tank and storage tank Between be separately connected with overflow pipe, overflow pipe is connected to I Room bottom.

6. improved frictional head loss experimental provision according to claim 4, it is characterised in that：Along journey experimental channel It is provided with flow meter.