CN202048937U - Simple flowmeter for field ditches - Google Patents

Abstract

The utility model relates to a simple flowmeter for field ditches, which is characterized in that after water is drained from a ditch (1), a floater (4) drives a pointer (7) to deflect via a connecting rod (5) and a bearing (6) jacket mounted in the middle of a cross rod (3), wherein the pointer (7) is fixed on the bearing (6) jacket, and deflection angles of the pointer (7) assuredly correspond to water depths in the ditch (1) one by one. Flow numerical values corresponding to the water depths which are calculated or calibrated in advance are carved on a flow indicating dial plate (8), and the specific flow numerical values can be obtained by means of reading flow graduations, which are pointed by the pointer (7), on the flow indicating dial plate (8). The simple flowmeter for field ditches has the advantages of low investment, high reliability and convenience in use.

Description

The simple and easy flowmeter of field ditch

Technical field:

The utility model relates to a kind of open channel flow rate measurement mechanism, relates in particular to a kind of flow measurement device of catch feeder cheaply.

Background technology:

The irrigated area water gaging is rational management iirigation water source, the plan of correct execution water, strengthens the requisite measure of management of the use of water, is the prerequisite by side's charge, also is the important technical of weighing irrigation management level and irrigation water utilization factor height.

The irrigation canal system water gaging generally is measuring structures such as ad hoc weir, flume on canal system, and the science of throughput water buildings main paragraph water-carrying section is shunk, and makes its upstream and downstream form certain height of water, thereby obtains comparatively stable stage discharge relation.The monitoring of water level is to utilize ad hoc measuring structure to carry out the element task of flow rate calculation, and the level sensor that adopts in the irrigated area mainly contains float-type transmitter, pressure type sensor and ultrasonic sensor etc. at present.

Although open channel flow rate measuring technique equipment is quite ripe, because final stage channel (lateral canal, field ditch) is large in number and widely distributed, existing open channel flow rate measurement mechanism, be applied to the final stage channel, because existing problems such as input, operation, maintenance have restricted utilization and popularization at the final stage canal water gauging.Therefore, the metering of final stage canal capacity is a weak link of agricultural irrigation water metering always.Especially field ditch, quantity maximum in the final stage channel relates to the irrigated area huge numbers of families, more press for simple, economical, easily row, be convenient to the field ditch water measure equipment that the masses grasp and accept.

The utility model content:

The purpose of this utility model is to provide a kind of field ditch economical and practical, that reliability is high special-purpose simple and easy water measure equipment.

The purpose of this utility model is achieved in that

The special-purpose simple and easy water meter of a kind of field ditch, comprise that Transverse to the flow direction is across the channel top, two ends are individually fixed in symmetry and are placed in cross bar on the flowmeter support of channel both sides, interior cover is fixed in the bearing at cross bar middle part, float is the water droplet shape, the float microcephaly is fixed in an end of connecting rod, the other end of connecting rod is fixed in the outer of bearing that is installed in the cross bar middle part and puts, be fixed on the pointer on this bearing outside, be fixed in the flow indication dial plate on the cross bar, flow indication plane, dial plate place gets close to pointer perpendicular to cross bar.

After channel discharged water, float drove the pointer that is fixed on this bearing outside by connecting rod with the bearing outside that is installed on the cross bar middle part and deflects, and the depth of water in the deflection angle of pointer and the channel has to be determined to concern one to one.To calculate or demarcate good respective water depth corresponding flow numerical value portrayal in advance on flow indication dial plate, the flow scale by on the flow indication dial plate of reading pointer sensing obtains the concrete numerical value of flow.

The acquisition of flow scale is divided into two kinds of situations.Length forms open channel uniform flow during greater than 20 times of maximum water depths in the channel, with open channel uniform flow formula calculated flow rate.According to the different depth of waters in the channel, by the corresponding discharge of following formula calculating by channel, portrayal is on flow indication dial plate.

$Q=\mathrm{AC}\sqrt{\mathrm{Ri}}$

In the formula, Q---flow (m ³/ s);

A---discharge section area (m ²);

I---hydraulic slope is identical with longitudinal gradient at the bottom of the canal;

R---water-carrying section hydraulic radius (m), $R=\frac{A}{X};$

X---wetted perimeter (m);

C---open channel thanks to just coefficient, $C=\frac{1}{n}{R}^{1/6}$

N---roughness coefficien can be surveyed, also can be with reference to following numerical value: during smooth plank, and n=0.012; During concrete, n=0.014; When the field stone piece is built by laying bricks or stones, n=0.015.

For non-open channel uniform flow, can select typical canal section, actual measurement obtains the depth of water---discharge relation curve, on this basis, according to the different depth of waters in the channel, intercept corresponding flow numerical value on this curve, portrayal is used for the flow measurement of similar canal section on flow indication dial plate.

The utlity model has following good effect:

Saved ad hoc measuring structures such as weir, flume, the amplitude that has high input reduces; The simple and easy field ditch flowmeter structure of invention is simple, cheap, widely applies, and can save huge input; Simple structure, dismounting is moved very convenient, and flow circuit is used, and has reduced stolen probability; Need not training, only need simple explanation, just can skillfully use; Simple in structure, the probability that breaks down is little, the reliability height.

Description of drawings:

Fig. 1 is the vertical cross section that is placed in the simple and easy flowmeter of field ditch on the channel.

Fig. 2 is the vertical view that is placed in the simple and easy flowmeter of field ditch on the channel.

Embodiment:

The special-purpose simple and easy water meter of a kind of field ditch, as Fig. 1, shown in Figure 2, comprise: Transverse to the flow direction is across channel 1 top, two ends are individually fixed in symmetry and are placed in cross bar 3 on the flowmeter support 2 of channel 1 both sides, interior cover is fixed in the bearing 6 at cross bar 3 middle parts, float 4 is the water droplet shape, float 4 microcephalies are fixed in an end of connecting rod 5, the other end of connecting rod is fixed in the outer of bearing 6 that is installed in cross bar 3 middle parts and puts, be fixed on the bearing 6 outer pointers 7 that put, be fixed in the flow indication dial plate 8 on the cross bar 3, flow indication plane, dial plate 8 place gets close to pointer 7 perpendicular to cross bar 3.

After channel 1 discharged water, float 4 was fixed on the bearing 6 outer pointers 7 that put by connecting rod 5 and the bearing 6 overcoats drive that is installed on cross bar 3 middle parts and deflects, and the depth of water in the deflection angle of pointer 7 and the channel 1 has to be determined to concern one to one.To calculate or demarcate good respective water depth corresponding flow numerical value portrayal in advance on flow indication dial plate 8, the flow scale by on the flow indication dial plate 8 of reading pointer 7 sensings obtains the concrete numerical value of flow.

Embodiment: length forms open channel uniform flow during greater than 20 times of maximum water depths in the channel, with open channel uniform flow formula calculated flow rate.According to the different depth of waters in the channel, by the corresponding discharge of following formula calculating by channel, portrayal is on flow indication dial plate 8.

$Q=\mathrm{AC}\sqrt{\mathrm{Ri}}$

In the formula, Q---flow (m ³/ s);

A---discharge section area (m ²);

I---hydraulic slope is identical with longitudinal gradient at the bottom of the canal;

R---water-carrying section hydraulic radius (m), $R=\frac{A}{X};$

X---wetted perimeter (m);

C---open channel thanks to just coefficient, $C=\frac{1}{n}{R}^{1/6}$

N---roughness coefficien can be surveyed, also can be with reference to following numerical value: during smooth plank, and n=0.012; During concrete, n=0.014; When the field stone piece is built by laying bricks or stones, n=0.015.

For non-open channel uniform flow, can select typical canal section, actual measurement obtains the depth of water---discharge relation curve, on this basis, according to the different depth of waters in the channel, intercept corresponding flow numerical value on this curve, portrayal is used for the flow measurement of similar canal section on flow indication dial plate 8.

Claims (1)

1. simple and easy flowmeter of field ditch, it is characterized in that: comprise that Transverse to the flow direction is across channel (1) top, two ends are individually fixed in symmetry and are placed in cross bar (3) on the flowmeter support (2) of channel (1) both sides, interior cover is fixed in the bearing (6) at cross bar (3) middle part, float (4) is the water droplet shape, float (4) microcephaly is fixed in an end of connecting rod (5), the other end of connecting rod is fixed in outer the putting of the bearing (6) that is installed in cross bar (3) middle part, be fixed on the outer pointer (7) that puts of bearing (6), be fixed in the flow indication dial plate (8) on the cross bar (3), flow indication dial plate (8) plane, place gets close to pointer (7) perpendicular to cross bar (3).

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