CN202041234U - Flow meter of final-stage channel - Google Patents

Abstract

The utility model relates to a flow meter of a final-stage channel, which is characterized in that a floater (7) drives a rotating shaft (5) of a rotation angle displacement sensor (4) to rotate after the channel (1) drains water off, the rotation angle displacement sensor (4) converts mechanical signals of the rotation angle position into electrical signals, and the electrical signals is transmitted to a flow indicator (9) through an outgoing line (8) of the rotation angle displacement sensor (4) so as to enable a deflection angle of a dial plate pointer of the flow indicator (9) to be in one-to-one correspondence with the water depth in the channel (1). A calculated or calibrated flow value corresponding to the relevant water depth is marked on a dial plate of the flow indicator (9) in advance, and then a detailed value is obtained by reading a dial plate flow scale value pointed by the dial plate pointer of the flow indicator (9). The flow meter of the final-stage channel has the advantages of being small in investment, high in reliability and convenient to use.

Description

Final stage canal capacity meter

Technical field:

The utility model relates to a kind of open channel flow rate measurement mechanism, relates in particular to a kind of final stage canal capacity measurement mechanism of irrigating 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.Press for final stage canal water gauging equipment simple, economic, that easily go, be convenient to masses' grasp and accept.

The utility model content:

The purpose of this utility model is to provide a kind of economical and practical, final stage channel private volumn wetting system that reliability is high.

The purpose of this utility model is achieved in that

A kind of final stage canal capacity meter, comprise that Transverse to the flow direction is across the channel top, two ends are individually fixed in symmetry and are placed in crossbeam on the flowmeter support of channel both sides, anglec of rotation displacement transducer is installed at middle part at the flowmeter crossbeam, the shaft parallel of anglec of rotation displacement transducer is in the flowmeter crossbeam, the microcephaly of water droplet shape float is fixed in connecting rod, the other end of connecting rod is fixed in the rotating shaft of anglec of rotation displacement transducer, the extension line of anglec of rotation displacement transducer is connected on the flow indicating gauge, and anglec of rotation displacement transducer adopts the potentiometer type angular transducer.

After channel discharges water, float rotates by the rotating shaft of connecting rod driven rotary angle displacement sensor, anglec of rotation displacement transducer is converted to electric signal with the mechanical signal of rotary angle position, extension line by anglec of rotation displacement transducer, be sent on the flow indicating gauge, make the deflection angle and the depth of water in the channel of the dial plate pointer of flow indicating gauge that relation one to one be arranged.To calculate or demarcate good respective water depth corresponding flow numerical value portrayal in advance on the dial plate of flow indicating gauge,, obtain the concrete numerical value of flow by reading the dial plate flow scale of the dial plate pointed on the flow indicating gauge.

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 the dial plate of flow indicating gauge.

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

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),

X---wetted perimeter (m);

C---open channel thanks to just coefficient,

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 the dial plate of flow indicating gauge.

The utlity model has following good effect:

Saved ad hoc measuring structures such as weir, flume, the amplitude that has high input reduces; The final stage canal capacity meter of invention is simple in structure, 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 view that is placed in the final stage canal capacity meter on the channel.

Fig. 2 is the vertical cross section that is placed in the final stage canal capacity meter on the channel.

Fig. 3 is the circuit diagram of final stage canal capacity meter embodiment.

Embodiment:

A kind of final stage canal capacity meter, 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 crossbeam 3 on the flowmeter support 2 of channel 1 both sides, anglec of rotation displacement transducer 4 is installed at middle part at flowmeter crossbeam 3, the rotating shaft 5 of anglec of rotation displacement transducer 4 is parallel to flowmeter crossbeam 3, the microcephaly of water droplet shape float 7 is fixed in connecting rod 6, the other end of connecting rod 6 is fixed in the rotating shaft 5 of anglec of rotation displacement transducer 4, the extension line 8 of anglec of rotation displacement transducer 4 is connected on the flow indicating gauge 9, and angular sensor 4 adopts the potentiometer type angle displacement sensor.

After channel 1 discharges water, float 7 rotates by the rotating shaft 5 of connecting rod 6 driven rotary angle displacement sensors 4, anglec of rotation displacement transducer 4 is converted to electric signal with the mechanical signal of rotary angle position, extension line 8 by anglec of rotation displacement transducer 4, be sent on the flow indicating gauge 9, make the deflection angle and the depth of water in the channel 1 of the dial plate pointer of flow indicating gauge 9 that relation one to one be arranged.To calculate or demarcate good respective water depth corresponding flow numerical value portrayal in advance on the dial plate of flow indicating gauge 9,, obtain the concrete numerical value of flow by reading the dial plate flow scale of the dial plate pointed on the flow indicating gauge 9.

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 the dial plate of flow indicating gauge 9.

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

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),

X---wetted perimeter (m);

C---open channel thanks to just coefficient,

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 the dial plate of flow indicating gauge 9.

The embodiment circuit as shown in Figure 3,1 is electric battery, 2,3 is anti-interference filtration electric capacity, 4 is circuit of three-terminal voltage-stabilizing integrated, 5 are that full scale adjusts potentiometer,, 6 is potentiometer type anglec of rotation displacement transducer, 7 is anti-shake filter capacitor, 8 is the pointer type D.C. voltmeter.

Claims (2)

1. final stage canal capacity meter, 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 crossbeam (3) on the flowmeter support (2) of channel (1) both sides, anglec of rotation displacement transducer (4) is installed at middle part at flowmeter crossbeam (3), the rotating shaft (5) of anglec of rotation displacement transducer (4) is parallel to flowmeter crossbeam (3), the microcephaly of water droplet shape float (7) is fixed in connecting rod (6), the other end of connecting rod (6) is fixed in the rotating shaft (5) of anglec of rotation displacement transducer (4), and the extension line (8) of anglec of rotation displacement transducer (4) is connected on the flow indicating gauge (9).

2. a kind of final stage canal capacity meter according to claim 1 is characterized in that: described anglec of rotation displacement transducer (4) adopts the potentiometer type angle displacement sensor.

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