CN218955828U

CN218955828U - Open channel flow measuring device based on Doppler frequency shift

Info

Publication number: CN218955828U
Application number: CN202223096644.4U
Authority: CN
Inventors: 杨柳; 李国发; 王永东; 李岩; 尹立佐; 王莹
Original assignee: Xian University of Technology; China Railway 12th Bureau Group Construction and Installation Engineering Co Ltd
Current assignee: Xian University of Technology; China Railway 12th Bureau Group Construction and Installation Engineering Co Ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-05-02
Anticipated expiration: 2032-11-21

Abstract

The utility model discloses an open channel flow measuring device based on Doppler frequency shift, which comprises a Pasteur trough, wherein the width of the Pasteur trough is increased from the middle part to the two ends respectively, one end port of the Pasteur trough is provided with a filter assembly, the filter assembly comprises two or more filter plates which are sequentially arranged from the Pasteur trough port to the direction in the Pasteur trough, and an ultrasonic sensor probe for receiving and transmitting ultrasonic signals is arranged above the Pasteur trough.

Description

Open channel flow measuring device based on Doppler frequency shift

Technical Field

The utility model belongs to the technical field of flow metering equipment, and relates to an open channel flow measuring device based on Doppler frequency shift.

Background

In recent years, along with the rapid development of water conservancy construction in China, the open channel flowmeter monitoring system is suitable for measuring the flow of rectangular and trapezoidal open channels and culverts, such as reservoirs, rivers, hydraulic engineering, urban water supply, sewage treatment, farmland irrigation, water administration and water resources and the like, and has wide application.

According to different measurement principles, canal flow measurement is divided into a weir groove flow meter, an electromagnetic flow meter, an ultrasonic flow meter, a vortex street flow meter, a volumetric flow meter, a differential pressure flow meter and the like, and can be divided into an open channel flow meter and a pipeline flow meter according to channel types. The open channel flowmeter is mainly applied to farmland irrigation drainage channels, and the existing farmland irrigation drainage channel system flow metering mode has the following main problems: the measurement result is greatly changed by floaters, bubbles and water level in water; it is not considered that large particle stones or stones, if deposited on the measuring floor, would cause the water level to become high, thereby affecting the measuring accuracy. In general, conventional flow metering methods and apparatus for farm irrigation drainage systems are to be improved to improve measurement accuracy and precision.

Disclosure of Invention

The utility model aims to provide an open channel flow measuring device based on Doppler frequency shift, which avoids the influence of sundries such as floaters in water, realizes the measurement of the frequency change of reflected ultrasonic waves of water and solid particles in water in a drainage channel system, and can be used for calculating the water flow of the drainage channel system.

The utility model adopts the technical scheme that the open channel flow measuring device based on Doppler frequency shift comprises a Pasteur trough, the width of the Pasteur trough is increased from the middle part to the two ends respectively, a filter assembly is arranged at one end port of the Pasteur trough, the filter assembly comprises two or more filter plates which are sequentially arranged from the end port of the Pasteur trough to the middle direction of the Pasteur trough, and an ultrasonic sensor probe for transmitting and receiving ultrasonic signals is arranged above the Pasteur trough.

The present utility model is also characterized in that,

the Babbitt groove comprises a groove bottom plate, two groove side plates are symmetrically fixed on the groove bottom plate, the groove side plates and the groove bottom plate are mutually perpendicular and fixed through screws, and the distance between the two groove side plates is respectively increased from the middle part to the directions of two ends.

The groove side plates are sequentially connected by three groove side plates, and the end parts of two adjacent groove side plates are hinged through shafts.

The middle part of the side plate of the Pasteur trough is fixedly provided with a trough body extension frame, the trough body extension frame comprises width fixing beams which are respectively fixed at the top ends of the two trough side plates, a plurality of bolt holes are uniformly formed in the width fixing beams along the length direction of the width fixing beams, and the two width fixing beams are correspondingly arranged up and down.

The probe support is fixed on the two groove side plates, the probe support is provided with a bolt moving long groove, the probe support is fixed with a probe fixing plate through a connecting bolt and a nut, the connecting bolt is positioned in the bolt moving long groove, and the ultrasonic sensor probe is fixed on the probe fixing plate.

The filter is provided with two, including parallel arrangement's filter a and filter b, filter a and filter b all are perpendicular with the tank bottom board in pasteurization groove, and filter a is located pasteurization groove one end port, and filter b is located the pasteurization inslot, and the filtration pore aperture on the filter a is greater than the filtration pore aperture on the filter b.

The ends of the two groove side plates of the Pasteur groove, which are provided with one end of the filter plate, are provided with filter plate clamps which clamp and fix one end of the filter plate a, one end of the filter plate b and one end of the groove side plate

The beneficial effects of the utility model are as follows:

the open channel flow measuring device based on Doppler frequency shift has small resistance to water flow, simple structure and small volume, is convenient to use, is used for measuring the Doppler frequency shift which is the frequency change of reflected ultrasonic waves of water and solid particles in water in a drainage channel system, can effectively avoid the influence of floating matters, bubbles and water level in water on a measuring result during measurement, simultaneously avoids the influence of factors such as temperature, pressure, viscosity, density and the like of the measured fluid due to non-contact measurement, has high measuring precision, ensures the accuracy of Doppler frequency shift measurement, and can be used for accurately calculating the water flow of the drainage channel system.

Drawings

FIG. 1 is a schematic diagram of an open channel flow measurement device based on Doppler shift in accordance with the present utility model;

FIG. 2 is an exploded view of the Doppler shift based open channel flow measurement device of the present utility model;

FIG. 3 is a schematic view of the structure of a probe holder of the Doppler shift based open channel flow measurement device of the present utility model;

fig. 4 is a partial schematic view of an ultrasonic sensor probe of an open channel flow measurement device based on doppler shift according to the present utility model.

In the figure, 101, a groove bottom plate, 102, a filter plate clamp, 103, a filter plate a,104, a filter plate b,105, a groove side plate, 106, a probe bracket, 107, an ultrasonic sensor probe, 108, a groove body extension bracket, 109, a probe fixing plate and 110, connecting bolts.

Detailed Description

The utility model will be described in detail below with reference to the drawings and the detailed description.

The utility model discloses an open channel flow measuring device based on Doppler frequency shift, which comprises a Pasteur trough, wherein the Pasteur trough comprises a trough bottom plate 101, two trough side plates 105 are symmetrically fixed on the trough bottom plate 101, the trough side plates 105 and the trough bottom plate 101 are mutually and vertically fixed through screws, the distance between the two trough side plates 105 is respectively increased from the middle part to the two end directions, the trough side plates 105 are sequentially connected through three trough side plates, the end parts of the two adjacent trough side plates 105 are hinged through shafts, the opening degree can be adjusted, the structure of the Pasteur trough is utilized to ensure that the measuring range is large, the measurement is not influenced by the return water of a tributary surface or the water level change greatly, the installation is convenient, the standard channel can be directly installed without transformation, and the installation construction cost is low.

As shown in fig. 2, a filter assembly is arranged at one end port of the pasteurization tank, the filter assembly comprises two filter plates which are sequentially arranged from the end port of the pasteurization tank to the middle direction of the pasteurization tank, the filter plates a103 and b104 are arranged in parallel, each of the filter plates a103 and b104 is perpendicular to the tank bottom plate 101 of the pasteurization tank, the filter plate a103 is positioned at one end port of the pasteurization tank, the filter plates b104 are positioned in the pasteurization tank, the ends of one ends of the two tank side plates 105 of the pasteurization tank are provided with filter plate clamps 102, the filter plate clamps 102 clamp and fix one ends of the filter plates a103, one ends of the filter plates b104 and the ends of the tank side plates 105, the filter plate clamps 102 firmly fix the filter plates a103 and the filter plates 105 according to the design of the pasteurization tank body, the pore diameter of filter holes on the filter plates a103 is larger than that of the filter plates b104, and two-stage filtration is formed, so that the measurement of an ultrasonic sensor probe 107 is not influenced by the measurement of floating matters, bubbles and the like in water.

Be fixed with cell body extension frame 108 on the groove curb plate middle part of pasteurization groove, cell body extension frame 108 is including fixing the width fixed beam on two groove curb plate 105 tops respectively, evenly offered a plurality of bolt holes along its length direction on the width fixed beam, and two width fixed beams correspond about two width fixed beams about through the bolt fastening, have improved the stability of pasteurization groove curb plate 105, make the groove curb plate 105 upper and lower both ends all obtain fixedly to width fixed beam sets up a plurality of bolt holes and can adapt to different pasteurization groove widths.

The ultrasonic sensor probe 107 integrating the ultrasonic signal receiving and transmitting is arranged above the papanicolaou groove, the ultrasonic sensor probe 107 is not contacted with water flow, the influence of factors such as temperature, pressure, viscosity and density of fluid to be measured in ultrasonic frequency measurement is effectively avoided, the probe supports 106 are fixed on the two-groove side plates 105, as shown in fig. 3, bolt moving long grooves are formed in the probe supports 106, the probe fixing plates 109 are fixed on the probe supports 106 through connecting bolts 110 and nuts, the connecting bolts 110 are located in the bolt moving long grooves, as shown in fig. 4, the ultrasonic sensor probe 107 is fixed on the probe fixing plates 109.

The utility model relates to an open channel flow measuring device based on Doppler frequency shift, which comprises the following working principles:

the water flows into the pasteurization tank after being filtered by the filter component, and the ultrasonic sensor probe emits a frequency f from the upper part of the pasteurization tank ₀ The initial ultrasonic wave is reflected by solid particles (sediment and the like) in the water flow of the Papanicolaou tank and the water in the Papanicolaou tank respectively, and the ultrasonic sensor probe receives the ultrasonic wave with the frequency f respectively ₁ Is reflected by solid particles of ultrasonic wave and has a frequency f ₂ The Doppler frequency shift is obtained according to the water reflection ultrasonic wave of the solid particles and the water reflection ultrasonic wave,

in the formula (1), c>>vcos θ, Δf is the Doppler shift; θ is the included angle between the direction of ultrasonic wave emitted by the ultrasonic sensor probe and the fluid moving direction; f (f) ₀ Is the initial acoustic frequency; v is the average flow rate of solid particles in the water stream, also the average flow rate of the water stream; c is the propagation speed of the sound source in the medium;

the average flow velocity v of the water flow is calculated from the doppler shift, and therefore,

finally calculating the water flow Q of the irrigation drainage canal,

in the formula (3), Q is the instantaneous flow rate of the cross section, and A is the interface area of the channel, namely the cross section area of the channel.

According to the open channel flow measuring device based on Doppler frequency shift, the Doppler frequency shift is calculated by utilizing the fact that the frequencies of the ultrasonic waves reflected by solid particles in water and water in water flow of an irrigation drainage channel system are different, the average flow velocity of the water flow and the flow of the drainage channel are sequentially calculated according to the Doppler frequency shift, the measuring accuracy is high, and measuring errors caused by a plurality of interference factors are avoided.

Claims

1. The utility model provides an open channel flow measuring device based on Doppler frequency shift, its characterized in that includes the pasteurization groove, the pasteurization groove is by middle part to both ends direction width increase respectively, pasteurization groove one end port is provided with filter unit, filter unit includes two or more filter boards that set gradually by pasteurization groove port to direction in the pasteurization groove, pasteurization groove top is provided with ultrasonic sensor probe (107) of receiving and dispatching ultrasonic signal integration.

2. The open channel flow measurement device based on doppler shift according to claim 1, wherein the papanicolaou groove comprises a groove bottom plate (101), two groove side plates (105) are symmetrically fixed on the groove bottom plate (101), the groove side plates (105) and the groove bottom plate (101) are mutually perpendicular fixed through screws, and the distance between the two groove side plates (105) is increased from the middle part to the two ends respectively.

3. The doppler shift based open channel flow measurement device of claim 2, wherein the trough side plates (105) are connected in sequence by three trough side plates, adjacent two trough side plate (105) ends being hinged by a shaft.

4. The open channel flow measurement device based on Doppler shift according to claim 2, wherein a tank body extension frame (108) is fixed on the middle part of a tank side plate of the papanicolaou tank, the tank body extension frame (108) comprises a width fixing beam which is respectively fixed at the top ends of the two tank side plates (105), a plurality of bolt holes are uniformly formed in the width fixing beam along the length direction of the width fixing beam, and the two width fixing beams are correspondingly arranged up and down.

5. The open channel flow measurement device based on Doppler shift according to claim 2, wherein a probe support (106) is fixed on the two groove side plates (105), a bolt moving long groove is formed in the probe support (106), a probe fixing plate (109) is fixed on the probe support (106) through a connecting bolt (110) and a nut, the connecting bolt (110) is located in the bolt moving long groove, and the ultrasonic sensor probe (107) is fixed on the probe fixing plate (109).

6. The Doppler shift based open channel flow measurement device according to claim 2, wherein two filter plates are provided, each comprising a filter plate a (103) and a filter plate b (104) which are arranged in parallel, wherein each of the filter plates a (103) and b (104) is perpendicular to the bottom plate (101) of the pasteurization tank, the filter plate a (103) is positioned at one end port of the pasteurization tank, the filter plate b (104) is positioned in the pasteurization tank, and the filter hole diameter of the filter plate a (103) is larger than the filter hole diameter of the filter plate b (104).

7. The Doppler shift based open channel flow measurement device according to claim 6, wherein the ends of the two side plates (105) of the Papanicolaou trough are provided with filter plate clamps (102), and the filter plate clamps (102) clamp and fix the ends of the filter plate a (103), the filter plate b (104) and the trough side plates (105).