CN2132158Y - Flowmeter for use in open ditch - Google Patents

Abstract

The utility model relates to a flowmeter for use in an open channel, comprising a host computer, a throttling device, a float chamber, a float, a driving belt, a balance weight, a movable pulley, a driving wheel, and a potentiometer. A liquid level driving device comprises a positive drive belt, the driving wheel, the movable pulley, a precise multi-turn potentiometer, etc. As a result, the flow rate of the open channel is converted into electrical signals reliably, sensitively, and exactly; the electrical signals can be tested by the host computer; thereby, intellectualized test, digital display, integration, and print record for the flow rate of the open channel are realized. The utility model can be used in sewage drainage of urban environmental protection, irrigation in farmland water conservancy, and hydrographic survey.

Description

Flowmeter for use in open ditch

The utility model is an open-channel meter, be a kind of on open channel by restriction device, take out flow signal, with micro computer detect, the flow detection instrument of demonstration, integrating, print record.

Open-channel meter is mainly used to detect urban environmental protection sewage discharge, irrigation and water conservancy irrigation and hydrographic survey.At present more representational is a kind of micro computer open-channel meter that adopts supersonic liquid level to detect, its patent No. is CN86206999, its advantage is the liquid level with the ultrasound examination restriction device, restriction device can not blocked by dirt, but produce foam because sewage is surperficial, thereby easily cause the mistake survey and lose survey, and ultrasound examination is influenced by temperature, measuring accuracy is poor, installs complicated cost height.

The purpose of this utility model is to propose a kind of simple and reliablely and liquid level detection device that precision is very high is made the lower open-channel meter of a kind of cost, extensively promotes the use of being suitable for.

Principle of work of the present utility model is as follows: open-channel meter, comprise host computer (1), restriction device (2), it is characterized in that adopting float chamber (3), float (4), driving-belt (5), balance bob (6), travelling block (7), power wheel (8), potentiometer W(9) the accurate liquid level gearing of composition, driving-belt links float, be fixed on the float chamber loam cake behind power wheel, travelling block, balance bob hangs on the travelling block below.Potentiometer shaft (12) links to each other with power wheel (8), and the potentiometer signal links to each other with host computer.Restriction device, for example a kind of Bashel groove or weir plate, the flow size conversion that will flow through open channel is a liquid level height in the restriction device, and and then make with float chamber that restriction device is communicated with in float do to change up and down; The change up and down of float drives power wheel and travelling block by driving-belt, and potentiometer shaft is rotated, and potentiometer resistance changes thereupon, and the resistance value of this variation is sent into host computer.Host computer is the intelligence instrument of a change detected resistance value or magnitude of voltage, the level change that causes by flow, cause the resistance variations signal of potentiometer by level change, insert a slice V/F conversion chip IC1 and go up (see figure 4), add standard reference voltage (this voltage is provided by integrated voltage regulator source chip IC 6) for simultaneously potentiometer and IC1, the resistance variations of potentiometer just becomes change in voltage, realize the V/F conversion through IC1, through transistor BG shaping, become the pulse counting signal Vp that can directly detect again by host computer cpu chip IC2.Host computer is according to a series of transitive relations between flow, liquid level, float height, the potentiometer resistance, goes out instantaneous delivery, integrated flux in the open channel by computed in software, and shows and print record with LED is digital, finishes the measurement function of open-channel meter.The purpose that travelling block and balance bob are set is in order to reduce the float chamber height, to make compact conformation, and the frictional resistance of travelling block can not influence transmission accuracy.

Conventional floating drum rope or steel band are issuable to skid or the resistance of gear train transmission in order to overcome, driving-belt of the present utility model and power wheel adopt a kind of accurate synchronous belt and synchronizing wheel, because its flute profile design is unique, adopt nylon, glass fibre composite structure, both softness power wheels that links closely, can not extend again and the generation idle running of skidding, improve above-mentioned mechanically operated precision greatly.Resolution can reach ± 0.2mm, is higher than the precision of ultrasonic ranging ± 5mm.In addition, this is with synchronously and synchronizing wheel all belongs to standard component, can conveniently select for use.

In order to improve flow sensing precision and resolving power, cancel the train of reduction gears of common float level meter, thereby reduced the system friction resistance, potentiometer of the present utility model is a kind of accurate multi-turn formula potentiometer, this potentiometer adopts the very little erosion-resisting resistance wire coiling of temperature coefficient to form, in the change in resistance scope of correspondence, can doing nearly, the continuous adjusting of ten circles changes.The potentiometer shaft two ends are added with two precision bearings, and error is reduced greatly.

Be added with the breast wheel transmission of speed change between general potentiometer shaft and the power wheel, but in order to simplify and improve transmission accuracy, the utility model employing directly is enclosed within power wheel does transmission on the potentiometer shaft, power wheel directly drives potentiometer shaft and rotates.

After the utility model has the advantages that employing balance bob and travelling block, the float chamber height can significantly reduce; Adopt synchronous belt to improve transmission accuracy; Adopt the multi-turn precision resistor can improve accuracy of detection, increase measurement range.After a whole set of open-channel meter is made, can utilize that software function realizes on time, the flux cumulating of day, month, year, the flow a series of functions such as warning, timed print record, traffic trends analysis that overflow.

Fig. 1 is the utility model principle schematic.Fig. 2 is the synoptic diagram that power wheel, driving-belt adopt accurate synchronous belt and power wheel.And the expression driving wheel tube is done transmission on potentiometer shaft.Fig. 3 is the host computer theory diagram, wherein (13) are power supply, (14) be demonstration, keyboard, printer unit, IC2 is a cpu chip, and IC3 is the address latch chip, and IC4 is a data-carrier store RAM chip, IC5 is a program storage EPROM chip, Vcc is a power positive end, and DB, AB, CB, difference representative data, address, control bus connect into a single chip microcomputer mini system according to routine.Fig. 4 does not indicate that for V/F conversion part schematic diagram resistance capacitance is the common connection of IC1 chip.

Can be made into an open-channel meter according to accompanying drawing, its restriction device is standard weir plate or Bashel groove, is welded with plastic plate, can anti-various corrosion; Float chamber also is welded with plastic plate, and forms an integral body with restriction device, and the bottom is porose to communicate, and float is cylindric, diameter 300mm, and high 60mm hollow is also made for plastics; The synchronous belt model is that modular system is with synchronously, specification 1.5 * 180 * 10mm; Accurate multiturn potentiometer model is WX5-3K, and above-mentioned flow sensor sender mechanism is loaded on to be detected on-the-spotly, by a triple cable potentiometer resistance signal is delivered to host computer in instrument room or the duty room.Also potentiometer and IC1, IC6 can be contained in the on-the-spot flow signalling machine structure, transmit the Vp signal to host computer with cable.The chip-shaped IC1 of host computer is LM331; IC2 is 80C31; IC3 is 74HC373; IC4 is 6264; IC5 is 27C64; IC6 is MC1403; BG is 3DG6; Show and adopt the LED charactron, printer adopts commercially available TP μ P-40B type.

Claims (3)

1, a kind of open-channel meter, comprise host computer (1), restriction device (2), it is characterized in that adopting float chamber (3), float (4), driving-belt (5), and travelling block (7), balance bob (6), power wheel (8), potentiometer W (9) forms accurate liquid level gearing, driving-belt connection float also is fixed in float chamber top behind power wheel, travelling block.Balance bob hangs on the travelling block below.Potentiometer shaft (12) links to each other with power wheel, and the potentiometer signal links to each other with host computer.

2, open-channel meter as claimed in claim 1 is characterized in that driving-belt adopts a kind of synchronous belt of accurate tooth form engagement, and its power wheel adopts the corresponding synchronous power wheel.

3, open-channel meter as claimed in claim 1, it is characterized by potentiometer is a kind of accurate multi-turn formula potentiometer, precision bearing is equipped with at the two ends of its rotation axis.

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