CN2443332Y

CN2443332Y - Field watermeter

Info

Publication number: CN2443332Y
Application number: CN 00258063
Authority: CN
Inventors: 姜伟民
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-26
Filing date: 2000-10-26
Publication date: 2001-08-15
Anticipated expiration: 2010-10-26

Abstract

The utility model relates to a field water meter, which comprises a water rectifying pipe, a counting device, and a water outlet pipe. The utility model is characterized in that the utility model also comprises a rotary wheel chamber which is composed of a rotary wheel, a fine adjustment gear pair, and a counting device. The utility model can be suitable for the metering of water delivering quantity of a low water head for irrigation, and the requirement to the purity of water quality is not high. The utility model has the advantages of accuracy, high reliability, simple operation, and low price.

Description

The field water gauge

The utility model is mainly used in the metering of reservoir lateral canal irrigation water, can be directly installed on the lateral canal gate, and is the same with domestic water meter when current process water meter, can draw to add up water inventory (cubic meter) on dial plate, also can measure moment flow M ³/ second.

China's water resource lacks, serious restriction economic development and the people's normal life, utilize most agricultural irrigation water as occupying water resource, how to strengthen water commodity consciousness, the quota management of enforcement water is with water calculate-levy, charge according to quantity, controlling and guarantee water using planning, using water wisely with economic means, has been the task of top priority.

Present domestic most water conservancies irrigated area because of not being applicable to the measuring instrument of field water gaging on the existing market, does not therefore have metering facility, can only collect water rate per year or by cultivated land area (mu) so far.

There is small part water conservancy irrigated area on lateral canal, weir to be set or flume measures, promptly measures water flow M with weir or groove ³/ second, multiply by again accordingly and spend the water time, draw water amount.The mistake water inventory that draws with this measuring method is very inaccurate, and the peasant also is difficult to accept it as the foundation of imposing water rate.Its reason is owing to lateral canal saliva position and inflow will be subjected to the branch canal waterdrainage amount and the either large or small part obstruction of same branch canal floating thing makes the corresponding influence that reduces of inflow-rate of water turbine, thereby make the lateral canal flow often be in the change, and a general water tender will bear tens lateral canal mouths of management and other work, he can not draw water amount more accurately for a long time, maximum generally speaking is the flow of noting when discharging water at that time, the process of middle fluctuations in discharge is unmanned mensuration, so water amount is inaccurate certainly.Recently some unit improves the flume flow formula, but can not fundamentally solve middle fluctuations in discharge of the process that discharges water and the record problem of corresponding time, unless add electronic recording equipment, automatically write down the variation and the corresponding time of each flow, but no matter this device on costing an arm and a leg and based on peasant's the water tender's of basic unit culture, the management level, all can't be realized on lateral canal.

Civilian or the industrial water meter of Chu Shouing all has strict demand to water quality and hydraulic pressure in the market, and the water meter working pressure is 10kgf/cm ², be equivalent to 100 meters heads, and filtrator need be arranged, do not allow to contain in the water impurity, therefore can't to be used in head low (generally between 0.5-1 rice) pressure little at all, and water quality contains the metering of the water conservancy irrigation water of more silt and pasture and water floating thing.Because the water gaging work of the present most of irrigation district of China is also quite backward, even there is not a water-measuring device at all, the situation of wasting water is very serious, and to accomplish to fix quotas to control production charge according to quantity, key is accurately to measure and to obtain mass peasants' approval to water consumption, press for a kind of can being installed on the lateral canal water inlet, directly mass peasants' approval can accurately be measured and obtain to water consumption, press for a kind of can being installed on the lateral canal water inlet, be directly used in metering channel water, accurately and reliably, easy to operate, the water measure equipment that price is lower.

The purpose of this utility model provides a kind of field water gauge, can adapt to the metering of irrigation canal system low water head carrying capacity, and is less demanding to the water quality cleanliness, and accurately and reliably, easy to operate, price is lower.

The purpose of this utility model is achieved in that the field water gauge, comprises into water commutator tube, and counting assembly and rising pipe it is characterized in that: further comprising runner envelope, and described runner envelope is made up of runner, accurate adjustment gear pair and counting assembly.

The utility model compared with prior art has following advantage: 1) adapt to the metering of irrigation canal system low water head carrying capacity, at rated head 0.4-1.5 rice, rated flow 0.03-0.15M ³In/second the scope, higher water gaging precision is arranged, its error is no more than ± 2-5%, reaches national sector standard SL/T153-95, is not less than 5% requirement about field water gaging precision; 2) less demanding to the water quality cleanliness, garbage barrier net is housed before water gauge, current process simple filtration, but still contain in the water under the situation of a small amount of weeds, silt, floating thing etc., still can normally use for a long time, and keep precision; 3) simple in structure, economy and durability, cost low, be convenient to promote the use of.

Fig. 1 is the utility model field water gauge synoptic diagram;

Fig. 2 looks cut-away view for the utility model runner envelope master;

Fig. 3 is an A-A cut-open view among Fig. 2;

Fig. 4 looks cut-away view for the master of the utility model runner;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is the molded lines of the utility model runner;

Fig. 7 is the utility model gear ratio location drawing.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

The field water gauge, it comprises into water commutator tube 1, runner envelope 3 and rising pipe 5, described runner envelope 3 is by runner 2, runner shaft, 1: 30 worm gear pairs, precision adjusts gear pair and counting assembly 4 is formed.Described precision is adjusted gear pair and is made up of gear ratio 6 and gear ratio 7.Water inlet commutator tube 1 inducer is made streamlined, and its shock resistance is little, and pipe end is provided with cross 4 fair water fins, and water inlet is led directly, and current a fluid stream and water meter axis parallel, and can prevent to produce vortex, improve the water gaging precision.Runner 2 is made up of 3 curved surface buckets, nylon 660 integral die moulding, and high-precision 3 vane type lines of mould assurance and physical dimension are accurate, and be good from the static equilibrium performance of manufacturing process protection runner, water gaging precision height.Runner 2 diameters are Ф 200mm/m, and 3 diameter Ф 220m/m compare with runner envelope, are 0.91: 1, have guaranteed the water gaging precision of low water head situation.The runner bucket blade profile recedes, and is similar to the taper rotating plasma outward, and molded lines curved surface radian is little, the line style smoothness, and flow-passing surface is big, and weeds, floating thing etc. can be passed through smoothly, and pollution discharge capability is strong.The runner cantilever support, except that runner, other parts all do not expose, and can not blocked by weeds.Described rising pipe 5 can be a straight tube, also can be bend pipe.

Counting assembly 4 surperficial similar domestic water meter counting scales are adjusted gear pair with precision, and worm gear pairs connects, the transmission counting.Theoretically, the rotating speed of runner and the flow that passes through are directly proportional, and are complete linearities, but in fact owing to the fluid viscosity resistance, approximately linear is only accomplished in existence such as mechanical friction resistance, therefore no matter how accurate instrument all can have trueness error, needs to revise.The machinery friction resistance is relevant with the manufacturing mounting process, owing to can not accomplish that the manufacturing mounting process accuracy of every water meter is in full accord, all to test and adjust the water gauge precision when therefore water meter dispatches from the factory by platform, general water meter is equipped with adjustable plate in the runner envelope bottom, adjustment discharge orifice size is carried out the precision adjustment.

Therefore the utility model field water gauge hydraulic pressure is little, can not carry out the precision adjustment with the earial drainage form, has designed the device that the mode of adjusting revolution with the gear proportioning is come adjustment amount crystal degree.The volume relative method is come measured quantity water meter precision behind the employing table, and under the situation of detection head of stipulating and gatage, current flow into the pond through behind the water meter when dispatching from the factory detection, show that on water meter counter water amount is 1M ³, this moment, the water meter precision was ± 0.00% (0 bit error), if show on the water meter counter that water amount is 1.05M ³, and measure from the pond volume be 1M ³, this just has 5% 0 bit error, need pay by gear ratio and adjust.

Runner counting ratio of gear: (passing to counter)

Normal ratio of gear: 1 * 1/30 (worm gear pairs) * 60/30 (removable gear ratio is paid)=0.0667

Adjust ratio of gear:

1)1×1/30×61/29＝0.0701

Adjusting range: (0.0701-0.0667)/0.0667=+0.05

2)1×1/30×59/31＝0.0634

Adjusting range: (0.0634-0.0667)/0.0677=-0.0635

To the minimum adjusting range of 0 bit error-6.35%～+ 5%

When for example supposing that runner 1200 changes, just water amount is 10M ³, counter is consistent with pool volume calculating demonstration, and this moment, 0 bit error was ± 0.00%, and the revolution that is transferred on the counter is:

1200 change * 1/30 * 60/30=80

Show that on counter 80 change, water amount is 10M ³, and the water amount that pool volume records is 10.4M ³, this moment, 0 bit error was (10.4-10)/10.4=3.8%

Gear ratio is replaced by 61/29, and the revolution that be transferred on the counter this moment is:

1200 change * 1/30 * 61/29=84.14 changes, and having increased by 4.14 changes, and shows on the counter to change 10M into ³* 84.14/80=10.52M ³, this moment, 0 bit error was that+1% measuring accuracy has improved 3.8 times for (10.52-10.4)/10.4=0.01.

Claims

1, field water gauge comprises into water commutator tube (1), and counting assembly (4) and rising pipe (5) it is characterized in that: further comprising runner envelope (3), and described runner envelope (3) is made up of runner (2), accurate adjustment gear pair and counting assembly (4).

2, field according to claim 1 water gauge, it is characterized in that: described runner (2) is 3 curved surface buckets, and this vane foil recedes, and is similar to taper outward and revolves oar.

3, field according to claim 2 water gauge is characterized in that: described runner (2) is cantilever support, and except that runner, other rotating part does not all expose.

4, field according to claim 2 water gauge, it is characterized in that: described runner (2) diameter is Ф 200m/m, and the diameter of described runner envelope (3) is Ф 220m/m.

5, field according to claim 1 water gauge is characterized in that: described counting assembly (4) adjusts gear pair with precision and worm gear pairs connects, and described precision adjustment gear pair is made up of gear ratio (6) and gear ratio (7).

6, field according to claim 1 water gauge is characterized in that: described water inlet commutator tube (1) is for streamlined, and pipe end is provided with cross 4 fair water fins.

7, field according to claim 1 water gauge, it is characterized in that: described rising pipe (5) can be that straight tube also can be a bend pipe.