CN2319789Y

CN2319789Y - Weir groove type flow measuring device

Info

Publication number: CN2319789Y
Application number: CN 97248839
Authority: CN
Inventors: 庄旭桢
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-03
Filing date: 1997-12-03
Publication date: 1999-05-19
Anticipated expiration: 2007-12-03

Abstract

The utility model relates to a weir groove type flow measuring device. A long weir groove is divided into three parts which are a water inlet region, a static flow region and a discharge region, wherein, the water inlet region is positioned in front of a flow rectifying plate. The rear side end of the water inlet region is fixedly provided with a stilling well tube which is provided with a float-type flowmeter inside. The static flow region is positioned between the flow rectifying plate and the weir, and the bottom part of the weir groove is provided with an L-shaped water inlet pipe. The L-shaped water inlet pipe is communicated with the bottom part of the stilling well in the water inlet region, and the discharge region is positioned at the rear side of the weir plate. The device uses the L-shaped water inlet pipe to communicate the flow measuring point water level in the static flow region divided by the flow rectifying plate to the stilling well tube in the water inlet region, which causes the flowmeter to make use of the float-type gauge to monitor the water level and automatically convert into the flow value.

Description

The weir groove type flow measurement device

The utility model relates to a kind of weir groove type flow measurement device, be meant especially a kind of at microscler weir notch the thin-walled weir plate and cowling panel between installed a L shaped water inlet pipe, and the hydrostatic pipe before this L shaped water inlet pipe and the cowling panel is connected, and uses and utilizes float gauge and long term monitoring and the accumulative total device by the discharge water flow of weir notch.

Relevant regulations according at present relevant environmental protection decree, general factory all needs to be equiped with sewage flowmeter at sewage weif orifice place, if yet during installing pipeline type flowmeter, can all have because of the pipeline flowmeter of most types and be subjected to water quality impact to be directed at the inaccurate situation of measurement gradually, and when it is measured the generation query, also be difficult to verification; Relatively, the type weir flow formula flowmeter of building canals relatively is fit to measure use throughout the year.The measurement principle of this weir flow formula flowmeter is at a straight gool installing given shape " weir plate " (more general person is 90 ° of V-notch weir plates), and the sewage of order discharging overflow this weir plate and earial drainage, the depth of water of its overflow and the corresponding relation between flow, can present fixing " water level one flow " conversion relation according to fluid mechanics principle, and according to international standard flow measurement standard, at distance crest of weir upstream one segment distance and the uniform and stable place of current, measured water table ratio can meet the high-precision requirement of multi-scale formula, therefore, measure the mean water of this specific section, the facility of reduced discharge just becomes accurately simple and clear automatically again, reliable and stable and economical and practical flowmeter.

Usually weir flow formula flowmeter can adopt liquid level sensors such as float-type or ultrasonic formula, but because of the water level range of general weir flow many 0-30 centimetre among a small circle between change, and have only float-type sensor comparison energy long-term stability and keep 1 millimeter precision, other are subjected to temperature and interference in air flow easily as ultrasonic formula sensor and movingly shut out several millimeters beat now, in addition, then be subject to water quality impact as pressure type or capacitance type sensor and have temperature drift and problem such as length drift.In addition, referring to Fig. 1, common float-type water level measuring device is to be provided with a stilling well B in the outside of flume A, and the stilling well B of this peripheral hardware needs construction in addition, so that this stilling well B to be installed, causes the workload of construction and installation to increase; And common measurement mechanism is as being located at stilling well B flume A inboard (as shown in Figure 2), and then its groove width need be several times as much as the crest of weir width, so could eliminate because of the negative effect to current that stilling well B is caused is set.So this level measurement device has limited the applicability of floating drum sensing and detecting type weir notch flowmeter greatly, makes its good characteristic fail to use, be unfortunate very.

The purpose of this utility model provides a kind of incorporate weir groove type flow measurement device that overcomes existing weir flow formula flow measurement device defect.

The utility model is achieved in that it is that a microscler weir notch is separated into an inhalant region, a stationary stream district and a discharge region three parts, wherein inhalant region is between a baffle plate and cowling panel, and be provided with a head piece of going into that current to be measured can be guided in this weir notch at this baffle plate root edge, rear side end at inhalant region is installed with a hydrostatic well casing, and this hydrostatic well casing top is equiped with a flowmeter, but at the built-in floating drum that is provided with sensed level of this hydrostatic well casing, so that the water level signal in this hydrostatic well casing is transferred to flowmeter, to carry out the calculated flow rate value; Wherein the stationary stream district is positioned between a cowling panel and the thin-walled weir plate, be penetrated with a plurality of uniform and stable circular holes of flow rate of water flow that flow in this weir notch that make on this cowling panel, installed a L type water inlet pipe in this weir notch bottom in addition, this water inlet pipe one end passes the cowling panel root edge and the one plant is communicated with this hydrostatic well casing bottom, laterally is equipped with a plurality of inlet openings in addition on this L type water inlet pipe; Wherein discharge region is between a thin-walled weir plate and a baffle plate, and this baffle plate root edge is provided with a water delivering orifice, the current of having measured can be discharged this microscler weir notch.The utility model will be communicated to the flow measurement point water level that cowling panel is separated out the stationary stream district in the inhalant region hydrostatic well casing before this cowling panel by L type water inlet pipe, make this flowmeter can correctly monitor water level and convert automatically and draw flow number; And this weir slot integrated molding, making things convenient for installation, it just can make accurate float-type flow metre accurately move with minimum groove width, to bring into play best measurement water flow effects.

Wherein the end face of flowmeter can be installed a solar panel.

The utility model mainly is L type water inlet pipe of installing between the thin-walled weir plate of a microscler weir notch and cowling panel, the flow measurement point water level in the stationary stream district that will be separated out with cowling panel by this L type water inlet pipe is communicated in the hydrostatic well casing of inhalant region before this cowling panel, makes flowmeter can correctly monitor water level and convert automatically and draws flow number.Weir slot integrated molding of the present utility model helps installation, and it just can make accurate float-type flow metre accurately move with minimum groove width, and performance optimised quantity water effect.The utility model not only is convenient to the integrated construction installation, and it can be connected in series easily and be installed in effluent outfall or directly embed in the escape canal, and its measured value is accurate, and single unit system is convenient to maintenance, moreover, also can utilize sun power and need not to connect any spool to form whole independent device.

Fig. 1 is the cut-open view of the present float-type level measurement device that uses, and its demonstration stilling well is located at the outside of flume outward.

Fig. 2 is the cut-open view of the present another kind of float-type level measurement device that uses, and it shows the situation that stilling well is located at the inboard of flume and is impacted current.

Fig. 3 is a perspective view of the present utility model;

Fig. 4 is a cut-open view of the present utility model;

Fig. 5 is a top view of the present utility model;

Fig. 6 is the assembling synoptic diagram of the utility model and effluent outfall;

Fig. 7 is that the whole group of the utility model embeds the structural representation that is installed in the sewage discharge irrigation canals and ditches;

At first consult Fig. 3-shown in Figure 5, the utility model mainly is that a microscler weir notch 1 is separated into an inhalant region 10, one stationary stream district 20 and a discharge region 30 3 parts, wherein inhalant region 10 is between a baffle plate 11 and cowling panel 21, current to be measured can be guided to and go into head piece 12 in this weir notch 1 and be provided with one at these baffle plate 11 root edges, rear side end at inhalant region 10 is installed with a hydrostatic well casing 40, and these hydrostatic well casing 40 tops are equiped with a flowmeter 41, but in these hydrostatic well casing 40 built-in floating holes 42 that are provided with sensed level, and this floating drum 42 is connected in a floating hole formula water level sensor 422 by a transmission rope 421, so that the water level signal in this hydrostatic well casing 40 is transferred in the flowmeter 41, and and then convert to show moment flow and accumulative total numerical value, then can install a solar panel 43 at the end face of this flowmeter 41 in addition, using provides these float-type flow metre 41 operations required electric energy.Wherein stationary stream district 20 is between a cowling panel 21 and a thin-walled weir plate 28, be penetrated with a plurality of uniform and stable circular holes 22 of flow rate of water flow that flow in this weir notch 1 that make on this cowling panel 21, use and make the current that flow in this weir notch 1 uniform and stable, and and then this stationary stream district 20 of dissipating in water surface slot wave phenomenon so that can improve the precision of measured water level.Installed a L type water inlet pipe 25 in this weir notch 1 bottom in addition, these water inlet pipe 25 1 ends pass cowling panel 21 root edges and the one plant is communicated with these hydrostatic well casing 40 bottoms, on this L type water inlet pipe 25, laterally be equipped with a plurality of inlet openings 26 in addition, using water level with stationary stream district 20 is communicated with exactly and is passed in the hydrostatic well casing 40, and then this float-type flow metre 41 can accurately be converted measure discharge, these thin-walled weir plate 28 apical margin crests of weir slime flux that then supplies water flow to a discharge region 30 and forms the water level relevant with flow.Wherein discharge region 30 is between a thin-walled weir plate 28 and a baffle plate 31, and these baffle plate 31 root edges are provided with a water delivering orifice 32, the current of having measured can be discharged this microscler weir notch 1, uses the effect that one is finished the weir groove type flow measurement.

Relevant actual installation structure of the present utility model and measurement situation thereof, then please cooperate and consult Fig. 6, shown in Figure 7, be provided with the situation (as shown in Figure 6) of effluent outfall 50 for general factory, its effluent outfall 50 can block be installed on these microscler weir notch 1 two ends for planting respectively go into head piece 12 and water delivering orifice 32, thereby make the sewage of factory's discharging to be measured can accurately totally calculate sewerage discharging flow by the utility model.And be provided with the situation (as shown in Figure 7) of sewage discharge irrigation canals and ditches 60 for general factory, microscler weir notch 1 of the present utility model can directly embed in the discharging irrigation canals and ditches 60, and do not install two

baffle plates

11,31 at the rear and front end of its weir notch 1 face, make the inhalant region 10 of this weir notch 1 and the discharge region 30 can be directly by circulating mutually with discharging irrigation canals and ditches 60, at this moment, the crest of weir of this weir plate 28 can suitably reduce and reduce the height of swell of irrigation canals and ditches.So, the sewage of being discharged no matter by effluent outfall 50 or irrigation canals and ditches 60, it obtains steadily current uniformly via the cowling panel 21 of this microscler weir notch 1, and the some inlet openings 26 on this L type water inlet pipe 25, then the cell body water level in stationary stream district 20 can be communicated in the hydrostatic well casing 40, and the utility model can be formed with fixing " water level-flow " relation formula to current by the weir plate of given shape, so as long as the utility model is by the water level in these floating drum 42 measurement hydrostatic well casings 40, just can converse the high flow number of reliability, and its measuring accuracy is between 1-3%, in addition, flowmeter 41 of the present utility model connects solar panel 43 with specially designed power circuit, traditional flowmeter can be exempted and the problem of power pipeline need be socketed, the flowmeter facility is whole independent to be installed thereby make, and is not subjected to external interference and long-term complete monitoring record is provided.This device also can reach the numerical value of accurate demonstration sewage moment flow, spiral shell meter flow and water level height except that utilizing solar panel 43 to provide the electric energy, and the complete monitoring record of quantity of wastewater effluent can be provided.

Claims

1, a kind of weir groove type flow measurement device, it is characterized in that: it is that a microscler weir notch is separated into an inhalant region, one stationary stream district and a discharge region three parts, wherein inhalant region is between a baffle plate and cowling panel, and be provided with a head piece of going into that current to be measured can be guided in this weir notch at this baffle plate root edge, rear side end at inhalant region is installed with a hydrostatic well casing, and this hydrostatic well casing top is equiped with a flowmeter, but at the built-in floating drum that is provided with sensed level of this hydrostatic well casing, so that the water level signal in this hydrostatic well casing is transferred to flowmeter, to carry out the calculated flow rate value; Wherein the stationary stream district is positioned between a cowling panel and the thin-walled weir plate, be penetrated with a plurality of uniform and stable circular holes of flow rate of water flow that flow in this weir notch that make on this cowling panel, installed a L type water inlet pipe in this weir notch bottom in addition, this water inlet pipe one end passes the cowling panel root edge and the one plant is communicated with this hydrostatic well casing bottom, laterally is equipped with a plurality of inlet openings in addition on this L type water inlet pipe; Wherein discharge region the thin-walled weir plate and-baffle plate between, this baffle plate root edge is provided with a water delivering orifice, the current measured can be discharged this microscler weir notch.

2, weir groove type flow measurement device as claimed in claim 1 is characterized in that: wherein the end face of flowmeter can be installed a solar panel.