CN100593693C

CN100593693C - Constant current detection system for rate of flow of sewage

Info

Publication number: CN100593693C
Application number: CN200710156317A
Authority: CN
Inventors: 章春根
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-23
Filing date: 2007-10-23
Publication date: 2010-03-10
Anticipated expiration: 2027-10-23
Also published as: CN101419085A

Abstract

The invention relates to a detecting system, which is capable of keeping constant current of sewage rate in large-caliber pipelines, and highly precisely measuring and on-line detecting other sewage rate measuring instruments. In the detecting system, a shut-off valve provided with a step motor is connected with an inlet of a shell; an energy transformation sliding chute, a force transmitting prolate axis, a square balance damper, a horizontal displacement transmitting support, a displacement sensor (LVDT) and a main controller are connected in order and fixed in the shell; and the main controller is connected with a remote computer through a data wire. Sewage falls freely from the inlet of the shell through the shut-off valve and enters the energy transformation sliding chute to generateimpulse in the horizontal direction, the impulse is transmitted to the square balance damper through the force transmitting prolate axis and then to the displacement sensor through the transmitting support, so as to generate an electric current change value; the electric current change value is subjected to A/D conversion according to fixed time intervals by the main controller and converted intoreal-time flow rate; and the measured real-time flow rates are accumulated to obtain total sewage amount and results are displayed by the remote computer, and the remote computer can control the system and automatically calibrate the system.

Description

Sewerage constant flow detecting system

Technical field

The present invention relates to that a kind of sewerage constant flow detects and the verifying attachment of discharge of sewage meter tool, especially can high precision (error be no more than ± 0.1%) detect the discharge of sewage that is mixed with multiple complicated composition and at the sewerage constant flow detecting system of X-ray inspection X sewage flowmeter measuring device tool.

Background technology

Along with the degree of accuracy of environmental protection industry to discharge of sewage measurement and control, reliability requirement is more and more higher, the flow instrument kind that successively grows up has tens classes both at home and abroad, up to a hundred, more representational just have a positive displacement, differential pressure type, eddy currents, the area formula, electromagnetic type, type such as ultrasonic type and thermal flowmeter, but because flow is a dynamically amount, the liquid internal that is kept in motion not only exists the viscous friction effect, also can produce complex flow phenomenons such as unsettled vortex and secondary flow, measurement instrument itself is subjected to numerous factors, as: pipeline, caliber size, shape (circle, rectangle), boundary condition, rerum natura (the temperature of medium, pressure, density, viscosity, dirty property, corrosivity etc.), flow state (the disturbed flow condition of fluid, velocity distribution etc.) and the influence of mounting condition and level, although existing flow instrument all has detection characteristics separately, but integrate above-mentioned many special medias that influences the factor of accuracy of detection in the face of sewage is this, in the practical application that its flow is monitored, all there be the flow displayed value and the bigger problem of actual flow deviation of measurement in existing flowmeter, and in blowdown enterprise and wastewater treatment department since metering when being forbidden to cause contradiction Measuring and testing department do not have the online verifying attachment of compellent standard that existing flow instrument is carried out authority to check yet.

Summary of the invention

Existing flow instrument is big in the face of this fluctuations in discharge of sewage when detecting the discharge of sewage, inner case is complicated in order to overcome, have the too big problem of error during impure, corrosive special media, and solution metrological service does not have the difficulty of the standard set-up of effective online detection flow instrument accuracy, the invention provides a kind of sewerage constant flow detecting system, this sewerage constant flow detecting system detects the influence that flow is not subjected to fluid inner case, fluctuations in discharge, impurity composition and viscosity.

The technical solution adopted for the present invention to solve the technical problems is: connected successively by stepper motor, reducer casing, stop valve, stop valve is fixed on outside the casing as inlet, by energy conversion chute, power transmission major axis, square balance damper, horizontal shift transmit support, displacement transducer (LVDT), master controller is linked in sequence and be fixed in the casing, displacement transducer (LVDT) is electrically connected with master controller, and master controller is connected with remote computer by data line.Sewage freely falls to the horizontal direction impulse force that the energy conversion chute produces after stop valve enters casing, passing to square balance damper through the power transmission major axis passes to displacement transducer and makes it produce an electric current changing value through transmitting support again, change and be converted into real-time traffic by master controller by Fixed Time Interval A/D, the real-time traffic accumulative total that records obtains the sewage total amount and by the remote computer display result that connects master controller, remote computer can be controlled and calibration automatically sewerage constant flow detecting system.

The invention has the beneficial effects as follows:

1, when the desired value of real-time traffic and setting is inconsistent, the main controller controls stepper motor adjust the stop valve aperture make real-time traffic all the time with the target value set basically identical, all be stabilized near the target value set with the discharge of sewage of the energy conversion chute of guaranteeing to flow through, eliminated since the discharge of sewage to change the metering that causes too greatly inaccurate.

2, the discharge of sewage is to produce displacement by the sewage impact energy conversion chute that freely falls to the energy conversion chute from stop valve, and horizontal displacement sensors (LVDT) is measured with the form of current change quantity, is changed and calculates by A/D by master controller again.No matter how complicated the inner case of sewage is, how changeable impurity composition is, viscosity how, sewage in the energy conversion chute by the time result all just make the energy conversion chute produce a different horizontal shift, high level of accuracy displacement transducer (LVDT) can dynamically detect horizontal displacement continuously, master controller can be converted into instantaneous delivery to the testing result of horizontal shift biography device (LVDT) incessantly with the fixed speed of handling p.s. more than five times after the A/D conversion, obtain sewage quantity accurately at last;

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is an overall construction drawing of the present invention.

Fig. 1 spring plank pressing plate (8) of being hit by a bullet, latch plate clamping plate (9), forward horizontal stand frame (13), latch plate (14), back balance frame (15) are formed horizontal rectangular balance damper;

Sensor holder (10) among Fig. 1, displacement transducer LVDT (11) transmits support (12) and forms flow quantity detection mechanism;

Energy conversion chute (4), power transmission major axis (5), forward horizontal stand frame (13) among Fig. 1, latch plate (14), back balance frame (15), middle wallboard (16) is formed energy transfer mechanism;

Among Fig. 1, stepper motor (1), reducer casing (2), stop valve (3), master controller (7) are formed flow control mechanism:

Fig. 2 is a horizontal rectangular balance damper enlarged detail among Fig. 1.

Fig. 3 is a flow quantity detection mechanism enlarged detail among Fig. 1.

Fig. 4 is the overall block diagram that connects of inner composition of master controller among Fig. 1 (7) and computer of the present invention control.

1. stepper motors among the figure, 2. speed reduction unit, 3. stop valve, 4. energy conversion chute, 5 power transmission major axis, 6. casing, 7. master controller, 8. latch plate pressing plate, 9. latch plate clamping plate, 10. sensor holder, 11. displacement transducer LVDTs, 12. transmit supports, 13. the forward horizontal stand frame, 14. latch plates, 15. back balance framves, 16. middle wallboard, 17. handwheels, 18. master control boards, 19. controllor for step-by-step motor, 20. analog quantity transducers, 21. remote control computers.

Embodiment

Energy transfer mechanism: among Fig. 1, energy conversion chute (4), power transmission major axis (5), forward horizontal stand frame (13), latch plate (14), back balance frame (15), middle wallboard (16) is fastenedly connected successively.Sewage enters the horizontal direction impulse force that the energy conversion chute (4) in the casing (6) produces from stop valve (3), passes to the forward horizontal stand frame (13) of square balance damper (Fig. 2) through power transmission major axis (5).Because energy conversion chute (4) does not directly contact with the middle wallboard of casing (16), just be fixed on the power transmission major axis (5), power transmission major axis (5) other end then passes the hole (not contacting with the hole) on the middle wallboard of casing (16), be fastenedly connected with the central bore of the forward horizontal stand frame (13) that is fixed on the cubic balance damper (Fig. 2) in the middle wallboard other end of the casing control box, do not contact with back balance frame (15), forward horizontal stand frame (13) is connected with two sides about back balance frame (15) is fixed on by latch plate (14), because the elastic deformation of latch plate (14) can produce a micro displacement with respect to back balance frame (15), displacement is gone up the discharge of sewage of passing through with energy conversion chute (4) and is directly proportional when stressed.

Flow quantity detection mechanism: among Fig. 1, transmit support (12), displacement transducer LVDT (11), sensor holder (10); Transmit support (12) and be fixed on forward horizontal stand frame (13) bottom, displacement transducer LVDT (11) shell (in inductive coil is arranged) is fastened on back balance frame (15) bottom by sensor holder (10), one of the center inductive axis then is fastened on horizontal shift fastening bottom forward horizontal stand frame (13) and transmits on the support (12), energy conversion chute (5) go up sewage by the time recoil strength caused horizontal shift be passed on the inductive axis of displacement transducer LVDT (11) center, make the undamped axially-movable that produces same displacement in the induced inside coil of inductive axis other end, center in its shell, master controller (7) is exported and passed to displacement with the form of inner coil current variable quantity by displacement transducer LVDT (11); Among Fig. 4, the analog quantity transducer (20) in the master controller (7) carries out the A/D conversion and is converted into real-time traffic by master control board (18), and the real-time traffic that records by Fixed Time Interval adds up to obtain the sewage total amount and shown by remote control computer (21).

Flow control mechanism: among Fig. 1, stepper motor (1), reducer casing (2), stop valve (3), master controller (7); Stepper motor (1) two shaft, a dress handwheel, the other end is connected with wheel box (2), and wheel box (2) is connected with stop valve (3) again; Among Fig. 4, the controllor for step-by-step motor (19) in stepper motor (1) and the master controller (7) is electrically connected, controlled by master control board (18); The aperture of stop valve (3) is to compare in real time by producing the effluent stream value of the interior master control board (18) of controller (7) according to detected instantaneous delivery value and default, realize by controllor for step-by-step motor (19) control step motor (1) rotating, when the detected flow value of master control board (18) greater than setting value, just stop valve (3) is turned down by controllor for step-by-step motor (19) control step motor (1), otherwise then open big, master control board (18) is stabilized near the setting value discharge of sewage with the mode of this real-time feedback by controllor for step-by-step motor (19) control step motor (1), to guarantee to enter the discharge of sewage stable (quantitatively) of detector, eliminate the detection error that causes too greatly because of fluctuations in discharge.

Claims

1, a kind of sewerage constant flow detecting system, by stepper motor, reducer casing, stop valve connects successively, stop valve is fixed on outside the casing as inlet, by the energy conversion chute, the power transmission major axis, square balance damper, support is transmitted in horizontal shift, displacement transducer, master controller is linked in sequence and is fixed in the casing, it is characterized in that: the energy conversion chute is fixedlyed connected with power transmission major axis one end, and the hole that the power transmission major axis other end passes on the middle wallboard of casing is fastenedly connected with the square balance damper forward horizontal stand frame central bore that is fixed on the middle wallboard other end of casing; Forward horizontal stand frame bottom is transmitted support one end with horizontal shift and is fastenedly connected, the support other end is transmitted in horizontal shift and horizontal displacement sensors center inductive axis is fastenedly connected, and the horizontal displacement sensors shell is fastenedly connected by the square balance damper back balance frame bottom that holder and back are fastened on the middle wallboard of casing.

2, sewerage constant flow detecting system according to claim 1, it is characterized in that: stepper motor is electrically connected with master controller, be subjected to main controller controls, and two shaft, a dress handwheel, the other end is connected with wheel box, wheel box is connected with stop valve again, the aperture of stop valve is to carry out in real time relatively back control step motor positive and inverse realization by master controller according to the desired value of detected instantaneous delivery value and default, when the detected flow value of master controller greater than setting value, with regard to the control step motor stop valve is turned down, otherwise then open big, master controller is stabilized near the target value set discharge of sewage with the mode control step motor of this real-time feedback, and is stable with the discharge of sewage of guaranteeing to enter detector, eliminates the detection error that causes too greatly because of fluctuations in discharge.

3, sewerage constant flow detecting system according to claim 1, it is characterized in that: the square balance damper forward horizontal stand frame left and right sides is connected with spring steel plate one end, the spring steel plate other end is fastenedly connected with the cubic flat balancing stand left and right sides, back, and wallboard is fastenedly connected in the middle of back balance frame back and the casing.

4, sewerage constant flow detecting system according to claim 1, it is characterized in that: the energy conversion chute does not directly contact with the casing wallboard, just be fixed on the power transmission major axis, the power transmission major axis other end then passes the hole on the middle wallboard of casing, be fastenedly connected with the forward horizontal stand frame central bore that is fixed on the cubic balance damper in the middle wallboard other end of the casing control box, because the forward horizontal stand frame of square balance damper is connected with two sides about the back balance frame is fixed on by latch plate, because the elastic deformation of latch plate can produce a micro displacement with respect to the back balance frame, the discharge of sewage of passing through on displacement and the energy conversion chute is directly proportional when stressed.

5, sewerage constant flow detecting system according to claim 1, it is characterized in that: the displacement transducer shell is fastened on square balance damper back balance frame bottom, one of the center inductive axis then is fastened on horizontal shift fastening bottom the forward horizontal stand frame and transmits on the support, on the energy conversion chute sewage by the time horizontal shift that recoil strength causes be passed on the inductive axis of displacement transducer center, make the undamped axially-movable that produces same displacement in the induced inside coil of inductive axis other end, center in its shell, displacement is exported and is passed to master controller and handle by displacement transducer with the form of displacement transducer inner coil current variable quantity.