CN1793790A

CN1793790A - Ultrasonic wave water flow measuring system

Info

Publication number: CN1793790A
Application number: CN 200510123738
Authority: CN
Inventors: 刘曰武; 徐永君; 王晓玲
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 2005-11-22
Filing date: 2005-11-22
Publication date: 2006-06-28
Anticipated expiration: 2025-11-22
Also published as: CN100381794C

Abstract

A water flow rate measurement system of ultrasonic thickness meter comprises water flow meter, ultrasonic thickness meter, driving unit and control unit. It features that ultrasonic thickness meter is set on driving unit. Signals issued by ultrasonic thickness meter and water flow meter are received by control unit and control signal from control unit is received by driving unit.

Description

Ultrasonic wave water flow measuring system

Technical field

The present invention relates to the discharge metering device in fields such as water conservancy, agricultural, particularly relate to a kind of ultrasonic wave water flow measuring system.

Background technology

The current meter is widely used in fields such as agricultural, water conservancy, is used to measure water velocity.In order to obtain the discharge in certain waters, all be to utilize current to measure the water velocity in this waters generally, measure the area of section in this waters again, utilize formula Q=SV to calculate gained again, wherein S is the area that water flows through, V is the speed that water flows through.For the discharge in cross sectional shape rule waters,, just can calculate easily as long as measure the speed of current.For the water surface of regular sections, traditional measuring method generally is to measure the flow velocity of water in the pipeline and the depth of water of a certain position with common velocimeter, further obtains area of section by the depth of water, just can try to achieve discharge in this zone by above-mentioned formula again.But for some irregular waters, local cross section, as the brook, mountain area, usually because various condition restriction such as geographical environment are measured relatively difficulty of discharge.Discharge how to measure to direct convenience the waters, irregular section is the problem that needs solution.

Summary of the invention

Purpose of the present invention just provides a kind of ultrasonic wave water flow measuring system that can shape waters, convenient and swift measurement irregular section.

For achieving the above object, invent a kind of ultrasonic wave water flow measuring system, comprise current meter, supersonic thickness meter, gearing and control system; Wherein said supersonic thickness meter is arranged on the gearing, the signal that control system reception current meter and supersonic thickness meter send, the control signal of gearing receiving control system.

Further, described gearing comprises motor, two supports, driving wheel, engaged wheel, wire rope, slide block and guide rails, the two ends of guide rail are installed in respectively on two supports, driving wheel and engaged wheel also are separately positioned on two supports, wire rope is on driving wheel and engaged wheel, slide block is installed on the guide rail and with wire rope and links to each other, and the output shaft of motor links to each other with driving wheel; Described supersonic thickness meter has gauge head, and this gauge head is installed on the slide block.

Further, described control system comprises Single Chip Microcomputer (SCM) system, human-computer interaction device, motor-drive circuit and serial ports level shifting circuit; Wherein, the human-computer interaction device is responsible for receiving user instruction and is transferred to Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system is not only controlled the motor-drive circuit drive motor and is carried out corresponding actions, and read the measurement result of supersonic thickness meter and current meter by the serial ports level shifting circuit, Single Chip Microcomputer (SCM) system is carried out measurement result computing and is delivered to the human-computer interaction device for demonstration then.

Ultrasonic wave water flow measuring system of the present invention, be to drive supersonic thickness meter by kinematic train, measure the water depth value of the some sampled points on the waters of irregular section, and measure water velocity by current, after calculating the area of section in this waters by control system then, obtain discharge according to formula.Adopt this measuring system, not only simple to operate, measurement data is accurate, and the automaticity height.

Description of drawings

Fig. 1 is the synoptic diagram in the waters of irregular section to be measured;

Fig. 2 is the process flow diagram of ultrasonic wave water flow measuring system of the present invention;

Fig. 3 is the structural representation of gearing.

Embodiment

Among Fig. 1, the cross section of water channel 3 to be measured is irregularly shaped, is that the water surface 1 of L is divided according to separation delta d with width, and the irregular section curve 2 of this water channel 3 is separated into n sampled point.

Fig. 2 is the process flow diagram of ultrasonic wave water flow measuring system of the present invention, and ultrasonic wave water flow measuring system comprises current meter, supersonic thickness meter, gearing, Single Chip Microcomputer (SCM) system, display screen LCD, keyboard, motor-drive circuit and serial ports level shifting circuit; The user instruction that keyboard is responsible for receiving is transferred to Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system is not only controlled the motor-drive circuit drive motor and is carried out corresponding actions, and read the measurement result of supersonic thickness meter and current meter by the serial ports level shifting circuit, Single Chip Microcomputer (SCM) system is carried out measurement result computing and is delivered to LCDs then.

Among Fig. 3, gearing comprises and is separately installed with driving wheel 7 and engaged wheel 8 on two supports 5, the support 5, the both ends of guide rail 6 are fixed on the support 5, wire rope 9 is on driving wheel 7 and engaged wheel 8, slide block 10 is installed on wire rope 9, slide block 10 has fixed bar 11, and the gauge head 4 of supersonic thickness meter is installed in the end of fixed bar 11, and the output shaft of stepper motor 12 links to each other with driving wheel 7.Wherein, the height of support 5 and fixed bar 11 can be regulated.

During work, single-chip microcomputer is by control motor-drive circuit drive stepping motor 12, the axle of stepper motor 12 cooperates with the driving wheel 7 of gearing, drive its rotation, driving wheel 7 drives slide block 10 with engaged wheel 8 by wire rope 9 and moves horizontally on guide rail 6, and the fixed bar 11 that is connected with slide block 10 can move gauge head 4 on the water surface.Because single-chip microcomputer is to the control action of stepper motor 12, the gauge head 4 of the supersonic thickness meter certain distance that whenever advances, just can input to supersonic thickness meter to the water surface elevation reflection wave signal and become the water surface elevation signal, obtain the sectional area of water channel again through the data processing of single-chip microcomputer.Simultaneously the current meter inputs to single-chip microcomputer with the water velocity value of measuring by the serial ports level conversion, just can obtain the current value in this waters by the calculating of single-chip microcomputer, and demonstrates the result by display screen LCD.

Single-chip microcomputer can be selected AT89C51 for use, display screen LCD adopts the LCM16032ZK Chinese fonts lcd module of high official position Creative Company, keyboard directly is connected to the P1 mouth of single-chip microcomputer, stepper motor 12 selects for use Beijing Seiko to become the 42BYG228 type 4 phase composite stepper motors of Mechanical and Electrical Equipment Company, this motor step elongation is 0.9 degree, the pulley radial design is 16mm, and single-chip microcomputer whenever sends 100 pulses, gauge head 4 2.5mm that advances on slotted line.The driving circuit of stepper motor 12 is selected driver module SMD-401 for use, and the additional optical electric isolating circuit is connected the driving force of raising single-chip processor i/o mouth, the interference between reduction driving circuit and the Single Chip Microcomputer (SCM) system with Single Chip Microcomputer (SCM) system.The measurement result of supersonic thickness meter and current meter is exported by the RS-232 serial ports, because interface circuit and microcontroller interface chip are TTL or CMOS level, when single-chip microcomputer is communicated by letter with the current meter with ultra-sonic depth finder, need carry out level conversion, so as with the level match of RS-232C standard.Adopt the MAX232 chip to finish level conversion, can guarantee that under the situation of 5V single supply switching levels meets rs-232 standard.

Supersonic thickness meter is at the depth of water h that measures each sampled point i _iAfter, single-chip microcomputer then utilizes formula:

S = Σ_{i = 1}^{n} \frac{1}{2} (h_{i} + h_{i - 1}) Δd,

Promptly can obtain the area S in this cross section, wherein the h in the formula _iBe the water depth value of i sampled point, n is a sampling number, and Δ d is a sampling interval.Then, single-chip microcomputer utilizes formula Q=SV to calculate the discharge Q in this waters according to the water flow velocity amount V that the current instrumentation arrives again.

Adopt this measuring system to carry out the measuring water flow in waters, irregular section, not only simple to operate, convenient and swift, measurement data is accurate, and the automaticity height.

Claims

1, a kind of ultrasonic wave water flow measuring system is characterized in that, comprises current meter, supersonic thickness meter, gearing and control system; Wherein said supersonic thickness meter is arranged on the gearing, the signal that control system reception current meter and supersonic thickness meter send, the control signal of gearing receiving control system.

2, ultrasonic wave water flow measuring system according to claim 1, it is characterized in that, described gearing comprises motor, two supports, driving wheel, engaged wheel, wire rope, slide block and guide rails, the two ends of guide rail are installed in respectively on two supports, driving wheel and engaged wheel also are separately positioned on two supports, wire rope is on driving wheel and engaged wheel, and slide block is installed on the guide rail and with wire rope and links to each other, and the output shaft of motor links to each other with driving wheel; Described supersonic thickness meter has gauge head, and this gauge head is installed on the slide block.

3, ultrasonic wave water flow measuring system according to claim 2 is characterized in that, described control system comprises Single Chip Microcomputer (SCM) system, human-computer interaction device, motor-drive circuit and serial ports level shifting circuit; Wherein, the human-computer interaction device is responsible for receiving user instruction and is transferred to Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system is not only controlled the motor-drive circuit drive motor and is carried out corresponding actions, and read the measurement result of supersonic thickness meter and current meter by the serial ports level shifting circuit, Single Chip Microcomputer (SCM) system is carried out measurement result computing and is delivered to the human-computer interaction device for demonstration then.