CN210398411U - Pipeline node hydraulic characteristic testing device - Google Patents

Abstract

The utility model discloses a pipeline node hydraulic characteristic testing arrangement, including the water tank, the water tank leads to pipe connects the entry of trunk pipe and branch pipe, the entrance of trunk pipe and branch pipe is equipped with the turbine flowmeter respectively, is equipped with a plurality of pressure sensor in the trunk pipe at pipeline node, the trunk pipe low reaches are equipped with the turbine flowmeter, pressure sensor and turbine flowmeter connect the computer; and a flow regulating valve is arranged at the outlet of the water pipe of the water tank and used for regulating the flow of water flow. The utility model can be applied to the research of exploring various variable influence factors, such as the research of changing the pipe diameter and keeping the flow velocity unchanged; changing the flow rate to keep the pipe diameter unchanged, and changing the fullness; and (5) researching the angle of the included angle of the pipeline.

Description

Pipeline node hydraulic characteristic testing device

Technical Field

The utility model relates to a hydraulics technical field, concretely relates to pipeline node hydraulic characteristic testing arrangement.

Background

The urban drainage pipe network is an important infrastructure of cities, and in recent years, along with the continuous development of the quantity and scale of cities in China, the building area is continuously increased, and the urban impervious area is greatly increased, so that the runoff coefficient is sharply increased under the same rainfall, huge pressure on urban drainage and urban river flood discharge is caused, and higher requirements are provided for urban drainage systems, particularly rainwater pipe network systems. In addition, flood disasters brought to cities by sudden heavy rainfall occur occasionally, and the defects that the original rainwater pipe network cannot discharge flood in time, pipelines are easy to damage and the like are obvious. Meanwhile, most cities in China still adopt constant flow to design a rainwater pipe network, when rainfall exceeds the designed flow or a pipeline fails, the urban drainage pipeline can form a phenomenon of full flow, the full flow is that the pipeline is in a non-full flow state with a free surface, the full flow is changed into full pipe flow along with the rise of the water level in the pipeline, the full flow is changed into non-full flow along with the fall of the water level, and the alternate occurrence of the two pipe flow states is the full flow. The phenomenon of full flow causes impact, cavitation erosion and other damages to the pipeline. A pipe node refers to a branch point or an intersection point of a pipeline. The process of changing the characteristics of the water flow in the storm water pipes can be roughly divided into the following stages: when rainfall just begins, the flow is small, the flow speed is slow, and all water flows in the rainwater pipeline are open flows. Along with the progress of rainfall process, the inflow in the rainwater pipeline is constantly increased, and the water flow in the pipeline can firstly have a pressure flow near the intersection or near the downstream boundary of the drainage pipeline. The pipeline node is used as a bottleneck plug of an urban pipeline network, the flowing state of fluid in the pipeline node is constantly changed, water flow in the pipeline has the characteristic of sudden expansion and sudden drop, and the pipeline node is considered according to non-constant flow in order to approach the real flowing of the water flow in the pipeline, namely a dynamic water-gas mixed state. And relatively few research is done on pipeline nodes, and most of research is done on circular pipelines, and the pipeline research of a rectangular section is very poor.

Therefore, a device capable of testing the water conservancy characteristics at the pipeline node is urgently needed at present, especially the device capable of testing the pipeline with the rectangular section can be met, the facility is simple in structure and convenient to operate, and the device capable of testing the water conservancy characteristics at the pipeline node can meet the requirement of testing under the condition of water flow, so that the device capable of testing the water conservancy characteristics at the pipeline node is applied to the research field of the water-gas two-phase flow theory.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art not enough, provide a pipeline node hydraulic characteristic testing arrangement, not only can consider the influence of the inside gas of pipeline, be close the real pipeline condition, can in time acquire the rivers dynamic variation process of pipeline node simultaneously, guarantee to infiltrate the accuracy of in-process sensor measured data, be suitable for very much because of the condition restriction monitoring large-scale pipe network, and the research of pipeline node hydraulic characteristic law that goes on in the laboratory.

In order to achieve the above object, the utility model discloses a following scheme realizes: the hydraulic characteristic testing device at the pipeline node comprises a water tank, wherein the water tank is connected with inlets of a main pipe and a branch pipe through a water pipe, turbine flowmeters are respectively arranged at the inlets of the main pipe and the branch pipe, a plurality of pressure sensors are arranged in the main pipe at the pipeline node, a turbine flowmeter is arranged at the downstream of the main pipe, and the pressure sensors and the turbine flowmeters are connected with a computer;

and a flow regulating valve is arranged at the outlet of the water pipe of the water tank and used for regulating the flow of water flow. In the present embodiment, the flow control valve is an EL-DCF01 model of enley technology.

The pressure sensors are arranged at the pipeline node at equal intervals, and the distance between the last pressure sensor and the last pressure sensor is twice the distance of the equal interval arrangement.

The main pipe and the branch pipes are concrete pipelines, and the pressure sensors are embedded in advance when the concrete pipelines are prefabricated.

Turbine flowmeter includes magnetoelectric converter, turbine and secondary instrument, the turbine is installed on the bearing, the turbine is equipped with a plurality of spiral blade, turbine top and the outer department of casing are equipped with magnetoelectric converter, magnetoelectric converter with secondary instrument connects, and magnetoelectric converter is used for converting turbine speed to the electric pulse, secondary instrument is used for showing the fluid flow rate.

And a preamplifier is connected between the magnetoelectric converter and the secondary instrument and is used for amplifying and shaping the electric signal of the magnetoelectric converter.

The pressure sensor adopts an MIK-P300 pressure transmitter.

The utility model has the advantages that: 1. the utility model discloses the research object is the rectangle pipeline, can provide data support for the hydraulic power characteristic of rectangle pipeline node, and the device thinking can be applied to the law exploration of circular pipeline node equally;

2. the utility model is supplied with water by the water tank, and the eddy flow at the inlet of the main pipe and the branch pipe can control the inflow flow, thereby controlling the relevant hydraulic parameters;

3. the utility model can be applied to the research of exploring various variable influence factors, such as the research of changing the pipe diameter and keeping the flow velocity unchanged; changing the flow rate to keep the pipe diameter unchanged, and changing the fullness; changing the angle of the included angle of the pipeline;

4. the utility model is carried out in the concrete pipeline, and the water and gas mixing condition at the node in the closed pipeline can be detected;

5. the utility model adopts the data acquisition device to collect the data of the moisture migration movement, and has high accuracy;

6. the utility model discloses at equal interval arrangement of pipeline node, last pressure sensor is the twice of equal interval arrangement distance from last pressure sensor, and such installation scheme has both guaranteed pipeline node data acquisition's intensity and has guaranteed experimental economic nature again.

Drawings

The invention will be further explained with reference to the drawings:

FIG. 1 is a structural diagram of a hydraulic characteristic testing device at a pipeline node;

FIG. 2 is a schematic view of a sensor inside a pipe;

FIG. 3 is a schematic view of a turbine flow meter;

in the figure: 1 pressure sensor, 2 turbine flowmeters, 201 magnetoelectric transducers, 202 turbines, 203 secondary instruments, 3 concrete pipelines, 4 water tanks and 5 computers.

Detailed Description

As shown in fig. 1-3, the device for testing hydraulic characteristics at a pipeline node comprises a water tank 4, wherein the water tank 4 is connected with inlets of a main pipe and a branch pipe through a water pipe, turbine flowmeters 2 are respectively arranged at the inlets of the main pipe and the branch pipe, a plurality of pressure sensors 1 are arranged in the main pipe at the pipeline node, the turbine flowmeters 2 are arranged at the downstream of the main pipe, and the pressure sensors 1 and the turbine flowmeters 2 are connected with a computer 5;

and a flow regulating valve is arranged at the outlet of the water pipe of the water tank 4 and used for regulating the flow of water flow.

The pressure sensors 1 are arranged at equal intervals at the pipeline node, and the distance between the last pressure sensor and the last pressure sensor is twice the distance of the equal interval arrangement. By the structure, the intensity of data acquisition at the pipeline node can be ensured, and the test economy is ensured.

The main pipe and the branch pipes are concrete pipelines, and the pressure sensors are embedded in advance when the concrete pipelines are prefabricated. The pipeline is made of concrete, and has strong impact resistance and difficult deformation.

Turbine flowmeter 2 includes magnetoelectric transducer 201, turbine 202 and secondary instrument 203, turbine 202 installs on the bearing, the turbine is equipped with a plurality of helical blade, turbine top and the outer department of casing are equipped with magnetoelectric transducer 201, magnetoelectric transducer 201 with secondary instrument 203 connects, and magnetoelectric transducer 201 is used for converting the turbine rotational speed into the electric pulse, the secondary instrument is used for showing the fluid flow rate. The vortex flowmeter is fixed on a pipeline, when water flow in the pipeline passes through the flowmeter, the turbine rotates at a certain rotating speed, the blades of the turbine cut magnetic lines on the electromagnet, according to the electromagnetic induction principle, a pulsating potential signal can be generated in the coil, the frequency of the pulsating potential signal is in direct proportion to the rotating speed of the turbine, namely the flowing rate of the passing fluid, and therefore the flowing rate of the fluid is measured. In this embodiment, the LW series with the model number of the control is used.

A preamplifier is connected between the magnetoelectric converter 201 and the secondary instrument 203 and is used for amplifying and shaping the electric signal of the magnetoelectric converter. With this configuration, the preamplifier amplifies and shapes the electrical signal of the magnetoelectric transducer to obtain an output signal, and converts the output signal into a signal displayed by the secondary meter 203.

The pressure sensor 1 adopts an MIK-P300 pressure transmitter. The special integrated circuit in the pressure transmitter converts millivolt signals of the sensor into standard voltage, current or frequency signals, and can be directly connected with a computer interface card. And the volume is small, the weight is light, and the sealing structure is made of stainless steel.

The utility model discloses application method:

1. assembling a test device, namely embedding the pressure sensors 1 at the positions of pipeline nodes in advance when prefabricating the concrete pipeline 3, wherein the first pressure sensor 1 is 1m away from the pipeline node and is arranged at the back at intervals of 1m, and the last pressure sensor 1 is 2m away from the last pressure sensor; the water tank 4 is filled with water and is connected to two inlets of the concrete pipeline 3 through a hose, and the valve is closed at the moment; the inlets of the main pipe and the branch pipe are respectively provided with a turbine flowmeter 2, and the downstream of the main pipe is provided with one turbine flowmeter 2.

2. Pipeline node hydraulic characteristic test is experimental, opens 4 valves on the water tank, and rivers get into inside 3 concrete pipes, survey 2 data of turbine flowmeter of concrete pipe entrance this moment, can adjust the flow size through the flow control valve of regulating tank according to experimental operating mode.

3. When the branch pipe water flow and the main pipe water flow are converged at a pipeline node, the pressure sensor 1 buried at the pipeline node can acquire water flow data in real time and collect and process the data through the computer 5, and the turbine flowmeter 2 at the downstream of the main pipe is used for recording the flow size after the water flow is stable.

The utility model discloses the study object is the rectangle pipeline, can provide data support for the water conservancy characteristic of rectangle pipeline node, and the law that this device thinking can be applied to circular pipeline node equally is explored.

The water is supplied from the water tank 4 and the swirl flow at the inlet of the main pipe and branch pipe can control the inflow flow, thereby controlling the relevant hydraulic parameters.

The device of the utility model can be applied to the research of exploring various variable influence factors, such as the research of changing the pipe diameter and keeping the flow velocity unchanged; changing the flow rate to keep the pipe diameter unchanged, and changing the fullness; changing the angle of the included angle of the pipeline, and the like.

The utility model discloses go on inside the concrete pipe, can detect out the water and gas mixing condition of the inside node of closed conduit.

The utility model discloses a pressure sensor and turbine flowmeter collect the data of moisture migration motion as data acquisition device, and the accuracy is high.

Claims (6)

1. Pipeline node hydraulic characteristic testing arrangement which characterized in that: the system comprises a water tank (4), wherein the water tank (4) is connected with inlets of a main pipe and a branch pipe through a water pipe, turbine flowmeters (2) are respectively arranged at the inlets of the main pipe and the branch pipe, a plurality of pressure sensors (1) are arranged in the main pipe at pipeline nodes, the turbine flowmeters (2) are arranged at the downstream of the main pipe, and the pressure sensors (1) and the turbine flowmeters (2) are connected with a computer (5);

and a flow regulating valve is arranged at the outlet of the water pipe of the water tank (4) and used for regulating the flow of water flow.

2. The hydraulic characteristic testing device at a pipeline node as claimed in claim 1, wherein: the pressure sensors (1) are arranged at the pipeline node at equal intervals, and the distance between the last pressure sensor and the last pressure sensor is twice the distance of the equal interval arrangement.

3. The hydraulic characteristic testing device at a pipeline node as claimed in claim 1, wherein: the main pipe and the branch pipes are concrete pipelines, and the pressure sensors are embedded in advance when the concrete pipelines are prefabricated.

4. The hydraulic characteristic testing device at a pipeline node as claimed in claim 1, wherein: turbine flowmeter (2) include magnetoelectric transducer (201), turbine (202) and secondary instrument (203), turbine (202) are installed on the bearing, the turbine is equipped with a plurality of helical blade, turbine top and the outer department of casing are equipped with magnetoelectric transducer (201), magnetoelectric transducer (201) with secondary instrument (203) are connected, and magnetoelectric transducer (201) are used for converting the turbine rotational speed into the electric pulse, the secondary instrument is used for showing fluid flow rate.

5. The hydraulic characteristic testing device at a pipeline node according to claim 4, wherein: and a preamplifier is connected between the magnetoelectric converter (201) and the secondary instrument (203) and is used for amplifying and shaping the electric signal of the magnetoelectric converter.

6. The hydraulic characteristic testing device at a pipe joint according to claim 1, 2 or 3, wherein: the pressure sensor (1) adopts an MIK-P300 pressure transmitter.

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