CN2619261Y

CN2619261Y - Continuous detector for chlorine residue

Info

Publication number: CN2619261Y
Application number: CN 03211827
Authority: CN
Inventors: 陈佩华
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-11
Filing date: 2003-03-11
Publication date: 2004-06-02
Anticipated expiration: 2013-03-11

Abstract

The utility model relates to a residue chlorine continuous measurement device for the water quality analysis, which includes a constant current device, a measurement groove and a zero adjustor. The utility model is characterized in that the circular constant current device has two hollow end-covers upper and lower. A glue film which can move up and down and a round adherent board are arranged between the two end-covers. A ball valve with a rod on the adherent board is connected with two springs, which can adjust the constant current after the water is accessed to save the water quantity consumed. The positive electrode platinum and the negative electrode copper are both put into the inside wall of the cylinder measurement groove. A cylindrical bench is arranged in the center of the groove and a certain amount of glass beads with holes in the center are also put into the groove. Under the impulse of the water flow, the glass beads make rotational flow to clean the surface of the two electrodes automatically in order to keep the sensitivity of the device stable in a long term. In addition, the zero adjuster with dechlorination liquid can be used to proofread the zero point of the device. The device is mainly used to measure the free residual chlorine. When 0.2V direct current voltage is applied between the two electrodes, the water sample with all the combined residual chlorine can be measured.

Description

Continuous residual chlorine tester

Technical field the utility model relates to a chlorine residue continuous measurement appearance for water quality analysis belongs to content automatic determination equipment.

Background artat present, a free reagent type residual chlorine instrument applied in a water plant, namely, a free residual chlorine continuous measuring instrument without adding reagent in work has the following five problems: the work of the instrument (I) generally adopts an overflow or shunt mode to stabilize water sample flow, a large amount of water samples are discharged from an overflow port or a shunt position, and the instrument works all the year round, so that great water waste is caused all the year round. One reference electrode is buried inside the cylindrical measuring tank, the other measuring electrode is made into a cylindrical shape and placed in the center of the measuring tank, fine sand grains are placed in the cavity, under the action of water power, the sand grains form circulation and ceaselessly rotate and rub to achieve the purpose of cleaning the electrodes, but the sand grains continuously rotate and rub and simultaneously generate a centrifugal force, the sand grains rotate at the edge in the measuring tank, only one reference electrode at the edge can be cleaned, the other electrode in the center cannot be cleaned, and the sensitivity of the instrument is reduced along with the prolonging of time. And thirdly, the sand grains are broken continuously and taken away by water flow when colliding in motion, and manual work is troublesome to supplement periodically. When the instrument starts to work, a chlorine-free water sample needs to be calibrated to determine the zero point, if the instrument is applied to a water works, the zero point is calibrated by distilled water firstly, but the distilled water and tap water have two water qualities which are obviously different, and the electric conductivity of the distilled water is dozens of times different, so that the zero point after calibration is large in deviation with an actual water sample, and when some instruments leave a factory, an activated carbon tank is arranged to enable the water sample to adsorb residual chlorine through carbon and then to be calibrated, but the method needs to replace the activated carbon regularly, and is more troublesome in maintenance. And (V) only one free residual chlorine can be measured, and chemical residual chlorine cannot be measured in the disinfection process of adding ammonia after chlorine is added.

The invention aims to provide a novel device which comprises: the zero regulator not only can save water consumption, but also can ensure that the cleaning effect of two electrodes is good, the sensitivity of the instrument is kept stable for a long time, and the zero regulator is provided with a convenient and accurate zero regulator, can still be applied to the disinfection process of chlorine feeding and ammonia adding in some waterworks, and achieves multiple purposes; the technical solution for realizing the above purpose is designed as follows: the residual chlorine continuous tester comprises a galvanostat, an automatic cleaning continuous measuring tank and a zero setting device, and the three parts are connected into a whole, and the residual chlorine continuous tester is characterized in that: a. a disc-shaped constant flow device of a continuous residual chlorine tester consists of two hollow upper and lower end covers and a middle layer of circular movable adhesive film attached plate, wherein a ball valve with rods at two ends is arranged above the attached plate, an upper rod of the ball valve is inserted into a rod supporting hole of the upper end cover, a peripheral cavity of the rod supporting hole is provided with a spring connected with the ball valve, a conical hole seat is arranged below the ball valve, a lower rod of the ball valve is contacted with a fixing bolt at the center of the attached plate through the conical hole seat, a nut at the lower end of the fixing bolt is arranged in a main force spring and is contacted with a spring seat on the lower end cover, the upper end cover is also provided with a water inlet pipe connector and a water sample outlet, the lower end cover is provided with two air holes; b. the automatic cleaning continuous determination groove is cylindrical, a semicircular anode made of platinum metal is embedded in the inner side of a circular wall, the inner side surface of the anode and the inner side surface of the circular wall form the same side plane and are connected with an outer wall anode binding post through a lead, a semicircular cathode made of copper metal is embedded in the inner side of the circular wall opposite to the anode, the inner side surface of the cathode and the inner side surface of the circular wall form the same side plane and are connected with an outer wall anode binding post through a lead, a cylindrical rack with a through hole at the center for circulating the zero adjusting liquid is arranged in the center of the determination groove, a liquid inlet hole, a fixed hole and a circular perforated baffle for discharging a water sample are arranged on the rack, 5 g of glass beads with a central perforated diameter of 3mm are arranged below the baffle, and two symmetrical jet inclined holes capable of forming annular rotation are drilled at the bottom of the; c. the zero regulator is square, one end is fixed and sealed, the other end is provided with two layers of partition boards, the outer layer partition board is provided with a test solution inlet hole with threads, and is matched with a fixed blanking cover with threads, the zero regulator is also provided with an inward extending air pipe, the center of the middle partition board is provided with an outward extending liquid level pipe, the distance between the plane of the pipe head of the inward extending air pipe and the middle partition board is 3-4mm, the outer wall of the zero regulator is provided with a test solution outlet hole, the outlet hole is provided with an adjustable titration valve, and the zero regulator is filled with dechlorination agent test solution when in use; the positive terminal and the negative terminal apply 0.2V direct current voltage, and platinum is connected with positive voltage, the instrument can be applied to the water treatment process of chlorine adding and ammonia adding to measure the chemical residual chlorine, and the instrument can be applied to the measurement of the free residual chlorine without applying voltage; 0.15 per mill of sodium thiosulfate solution is used for removing free residual chlorine in the dechlorinating agent test solution, or vitamin C is used for removing chemical residual chlorine at the concentration of 2 tablets/liter; the utility model discloses there are five advantages: the automatic constant flow device is designed, the water inlet amount is closed, the output water amount can be automatically adjusted when the environmental water pressure changes, and continuous overflow or flow division is not needed, so that the water consumption is greatly saved in the measuring process. Platinum is taken as an anode in the measuring tank, copper is taken as a cathode, the two electrodes are arranged on the inner side surface of the cylindrical measuring tank and correspond to each other, the surfaces of the two electrodes are continuously cleaned by constant water power to drive the glass beads, the cleaning effect of the surfaces of the two electrodes is good, and the sensitivity of the two electrodes is stable and reliable for a long time; thirdly, glass beads with a hole in the center and the diameter of 3mm rotate in the measuring groove, the glass beads are lighter than solid glass beads, the moving speed is high, the glass beads are not broken during cleaning, the glass beads do not need to be replaced all the year round, and the cleaning effect is better than that of sand particles; a zero regulator which is internally provided with a dechlorinating agent and can be constant-current is designed, only residual chlorine is removed from the water sample in the zero regulating process, all components in the water sample are kept unchanged, the dropping quantity can be randomly regulated, so that the zero regulating is accurate, the use is convenient, the volume is small, and the zero regulator can be attached to a measuring tank; the instrument is used in water works to monitor free residual chlorine, and if the positive pole and the negative pole of the measuring tank are applied with 0.2V DC voltage, the instrument can be used for measuring chemical residual chlorine in the water treatment process of chlorine feeding and ammonia adding, and a chemical-adding residual chlorine analyzer is not needed to be purchased, so that the instrument has multiple purposes.

Description of the drawings: fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a schematic circuit diagram of measuring free residual chlorine, fig. 3 is a schematic circuit diagram of measuring chemical residual chlorine, and fig. 4 is a relationship curve of free residual chlorine concentration and electric quantity.

The concrete implementation mode is shown in figure 1, the constant flow device of the residual chlorine continuous determinator is made of rigid plastics, and comprises two hollow upper end covers 11, lower end covers 15 and adhesive films 13, a circular plastic panel 12 is attached to the upper surface of the adhesive film, a circular stainless steel stress plate 14 is attached to the lower surface of the adhesive film, a fixing bolt 22 and a nut 19 are used in the center of the adhesive film to fix the upper and lower attached plates and the adhesive film into a whole, the lower part of the bolt is a main force spring 18, the spring is seated on a spring seat 17, the outer side surface of the spring seat can move up and down through screw thread matching with the central hole wall of the lower end cover so as to adjust the elastic force, a conical ball valve seat 10 with a hole is arranged in the center of the upper end cover, a ball valve 8 with rods at two ends is arranged onThe water enters a galvanostat through a water inlet pipe joint 9, and then enters a measuring groove through a constant flow outlet hole 23 and two inclined holes 7, and an upper end cover, a lower end cover and a middle glue film of the galvanostat are fixed together by eight bolts 21 at the equal part; the working principle of the galvanostat is as follows: liquid water sample P with pressure change₁Enters the cavity A of the upper end cover through a water pipe and then enters the cavity B through a ball valve, when the spring seat of the main force spring 18 is set at a certain position, the system reaches balance, and the output pressure is P₂If the pressure of the inlet pipe P₁With slight rise, the pressure in the cavity B increases along with the slight rise, the adhesive film and the attached plate move downwards, the ball rod which is originally contacted with the central bolt of the adhesive film attached plate and keeps balance moves downwards along with the adhesive film attached plate under the action of the spring 24, the gap of the valve is reduced by the downward movement of the ball rod, the resistance of the liquid flow is increased, and the pressure P of the water outlet hole 23 is increased₂When the pressure of the liquid flow at the inlet is reduced to the original balance state, the pressure in the cavity B is reduced, the ball valve rod moves upwards under the action of the spring 18, the ball valve gap is increased, the liquid flow resistance is reduced,the system makes the output liquid flow pressure P₂The original balance state is restored, thereby achieving the effect of voltage stabilization and constant current; the measuring groove is positioned at the upper part of the galvanostat and is made of transparent organic glass, the cylindrical wall 2 is provided with an anode 6, a cathode 26, a drain pipe joint 27, a thermistor jack 1 and a thermistor, the upper end of the measuring groove is provided with a cylindrical rack 31 made of organic glass, the rack is fixed at the center of the measuring groove and is provided with an air hole 28, a fixed hole 29 and a zero-adjusting liquid inlet 30, the lower part of the rack is a hollow column 20, a central through hole 4 in the column is communicated with the zero-adjusting liquid inlet and the bottom of the measuring groove, the middle part of the rack is provided with a circular orifice plate 3, tens of small holes are arranged on the orifice plate, the orifice plate protects the glass beads from loss and allows water samples to pass through, the bottom of the measuring groove is provided with two inclined holes 7, the water sample of the galvanostat forms rotating water flow in the circular measuring groove through the two S-shaped holes, the water flow drives the glass beads 5 to form a circular flow as shown by arrows in figure The surface plays a role in automatically cleaning the electrodes, and water flows out through the pore plate and is drained through the drain pipe; measuring two electrodes and negative electrode in the tankAfter the load resistors are connected, a primary battery is formed under the condition of water sample contact, Pt is a positive electrode, Cu is a negative electrode, when free residual chlorine exists in water, the reaction is as follows, and the positive electrode: negative electrode: the circuit of figure 2 has a measuring loop with current, the magnitude of the current is in direct proportion to the residual chlorine concentration, and the current flows through R₁Generating a voltage drop (mV), FIG. 4 is a curve of the voltage drop and the concentration of residual chlorine, FIG. 2 is a schematic diagram of a circuit for measuring free residual chlorine, A₁And A₂Is an operational amplifier, in the circuit: r₂＝R₃，R_f＝R_f’，R₄Is an input resistance, R_tIs a thermistor with negative temperature coefficient, W is a zero-setting potentiometer, FIG. 3 is a schematic diagram of a circuit for measuring chemical combination residual chlorine, A is an operational amplifier, W is a temperature sensor₁Is a 0.2V trimmer, W₂A zero-setting potentiometer; the zero setting device is made of transparent organic glass plate and comprises a bottom plate 37, an outer isolation plate 32, a test solution inlet 34, a combination of a screw thread arranged at the inner side of a solution inlet and a plug cover 33 provided with the screw thread, an air hole pipe 35 of the outer isolation plate, a liquid level pipe 39 arranged on a middle isolation plate 36 and filled with dechlorination solution 38, a liquid outlet hole 42 arranged on the outer wall, a titration valve 41 arranged outside the liquid outlet hole and an adjustable knob 40 arranged on the titration valve; prepare 0.15 thousandth concentration's sodium thiosulfate test solution earlier before zeroing, then open the blanking cover, pour the test solution into the ware of zeroing and fix the blanking cover again, during the use the position shown in figure 1 will take the blanking cover of zeroing to insert the fixed orifices on, adjust the titration valve, will dechlorinate liquid drop into the liquid entry of zeroing and flow into the survey groove bottom from the centre bore, when having chlorine residue in the survey groove, its chemical reaction: simultaneously, o-tolidine colorimetry is used for testing the residual chlorine content after dechlorination, dechlorination is carried out until the end point, and the circuit is shown in figure 2Adjusting the potentiometer W to output a measured value and display zero content, and completing zero adjustment; the flowing-out test solution of the zero setting device is constant, and the principle is as follows: in operation, the zeroing device filled with dechlorination liquid is inverted suddenly as shown in FIG. 1, vacuum space C is formed at the bottom of the zeroing liquid, liquid flows from the liquid level pipe into the lower isolation plate as shown by arrow, and the liquid level of the lower isolation plate rises to the liquid levelWhen the plane position of the tube head is positioned, the liquid level tube is sealed by the test solution, the upper water does not flow down under the action of the atmospheric pressure, the system reaches a balanced state, the height of the upper water level of the lower isolation plate is constant, when the resistance of the titration valve is not changed, the dripping flow is constant, and if the lower water level is reduced in the titration process, the upper water moves down for supplement, so that the resistance of the liquid flow of the titration valve is changed, namely the titration speed is changed.

Claims

1. The continuous residual chlorine tester comprises a galvanostat, a continuous automatic cleaning measuring tank and a zero setting device, which are integrated with each other, and is characterized in that:

a. a disc-shaped galvanostat for a continuous residual chlorine tester is composed of two hollow upper and lower end covers and a middle layer of circular movable adhesive film attached plate, a ball valve with rods at two ends is arranged above the attached plate, the upper rod of the ball valve is inserted into a rod supporting hole at the upper end, a peripheral cavity of the rod supporting hole is connected with the ball valve through a spring, a conical hole seat is arranged below the ball valve, the lower rod of the ball valve is contacted with a fixing bolt at the center of the attached plate through the conical hole seat, and a nut at the lower end of the fixing bolt is arranged in a main force spring and is contacted with a spring seat on the lower end cover. The upper end cover is also provided with a water inlet pipe joint and a water sample outlet hole, the lower end cover is attached with two air holes, and the upper end cover and the lower end cover are combined and then fixed by uniformly distributed bolts.

b. The automatic cleaning continuous measuring groove is cylindrical, a semicircular anode made of platinum metal is embedded in the circular wall, the inner side surface of the anode and the inner side surface of the circular wall form the same side plane, and the anode is connected with an outer wall anode binding post through a lead; a semicircular negative electrode made of copper metal is embedded on the inner side of the circular wall opposite to the positive electrode, the inner side surface of the negative electrode and the inner side surface of the circular wall are made into the same side plane, and the same side plane is connected with a negative electrode binding post outside the wall through a lead. The center of the measuring groove is provided with a cylindrical rack with a through hole at the center for circulating the zero-setting liquid, and the rack is provided with a liquid inlet hole, a fixed hole, an air hole and a circular perforated baffle plate for discharginga water sample. 5 g of glass beads with a hole at the center and the diameter of 3mm are arranged below the baffle plate, and two symmetrical jet inclined holes capable of forming annular rotational flow are drilled at the bottom of the measuring tank.

c. The zero setting device is square, one end is fixed and sealed, the other end is provided with two layers of partition boards, and the outer partition board is provided with a test solution inlet with threads and a fixed blanking cover with threads. The outer isolation plate is also provided with an air pipe extending inwards. The center of the middle isolation plate is provided with an outward extending liquid level pipe, so that the plane of the pipe head of the inward extending air pipe is 34 mm away from the middle isolation plate. The outer wall of the zero regulator is provided with a test solution outlet hole, an adjustable titration valve is arranged on the outlet hole, and dechlorinating agent test solution is filled in the zero regulator when the zero regulator is used.

2. The continuous measuring instrument for residual chlorine as claimed in claim 1, wherein: the positive pole connecting post and the negative pole connecting post apply 0.2V direct current voltage, and make platinum connect with positive voltage, the measuring tank can continuously measure the chemical residual chlorine in the water treatment process of chlorine adding and ammonia adding.

3. The continuous measuring instrument for residual chlorine as claimed in claim 1, wherein: the dechlorination agent test solution is used for removing free residual chlorine by using a sodium thiosulfate solution with the concentration of 0.15 per mill, or is used for removing chemical residual chlorine by using vitamin C with the concentration of 2 tablets per liter.