Residual charge detection device

Abstract

The utility model discloses a residual charge detection device, which comprises a residual charge sensor used for detecting the quantity of residual charges in a solution after a coagulant reaction, the residual charge sensor comprises a detection tube for the solution after the coagulant reaction to pass through, and a vertical magnetic field is applied outside the detection tube. Electrodes are arranged on the front side wall and the rear side wall of the detection tube, a wire used for forming a current loop is arranged between the two electrodes, and a signal transmitter used for measuring induced current is arranged on the current loop. Compared with the prior art, the vertical magnetic fields are applied to the upper side and the lower side of the detection tube, so that the solution flowing through the detection tube is detected, and impurities cannot be accumulated in the detection tube under the washing of the flowing solution, so that the electrode cannot be polluted, regular cleaning and maintenance are not needed, and the real-time monitoring of the dosage of the coagulant is ensured; and meanwhile, no abrasion exists in the detection pipe, so that the maintenance cost caused by abrasion is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of water treatment testing equipment, specifically relating to a residual charge detection device. Background Technology

[0002] Conventional water treatment in waterworks mainly involves four processes: coagulation, sedimentation, filtration, and disinfection. Coagulation is the first and most important process, where the mixing of coagulant and raw water occurs directly. The coagulation effect directly impacts the quality of the effluent. In water treatment, factors such as dosage, hydraulic conditions, water temperature, pH, alkalinity, and dosing method all affect the coagulation effect, with dosage having the greatest impact. Insufficient coagulant dosage cannot effectively reduce or eliminate the zeta potential, preventing particle aggregation. Conversely, excessive coagulant dosage can cause negatively charged colloids in the water to become positively charged, leading to colloid restabilization.

[0003] Currently, there are four main methods for controlling chemical dosing in water plants: manual dosing based on flow ratio, AI-based big data modeling control systems, floc imaging and recognition control systems, and intelligent dosing systems based on flow current meters. Manual dosing based on flow ratio is simple and requires little investment, but it relies heavily on operator experience and cannot respond promptly to sudden changes in water quality. AI-based big data modeling and floc imaging control systems are based on big data analysis; the more historical data available, the more accurate the dosing control. However, these systems require a large amount of data for learning, resulting in long debugging cycles and high investment costs. Intelligent dosing systems based on flow current meters are a type of feedback control that can respond quickly to changes in external environmental conditions.

[0004] The flow current meter dosing control system mainly consists of a flow current meter and a digital metering pump. The flow current meter can detect the water sample after coagulant dosing and provide feedback control for the on-site coagulant dosing metering pump, thereby realizing the automatic control and dosing of the coagulant dosing metering pump. Figure 1The diagram shows the structure and working principle of a current meter in the prior art. During operation, a motor drives a piston to reciprocate within the housing, maintaining continuous water sample flow. Simultaneously, a shearing action is generated, causing charged ions surrounding colloidal particles in the water to become free charged ions. The movement of these charged ions charges the lower electrode, resulting in an alternating current flow between the upper and lower electrodes, called the flowing current. The detected flowing current is then processed, and an electrical signal is output to the metering pump for controlling the dosage. In this method, because the water sample needs to remain within the housing, stains that can contaminate the electrodes accumulate after prolonged use. Therefore, these stains must be cleaned regularly, during which the entire meter cannot be used, thus affecting detection efficiency. Furthermore, because the piston moves within the housing, and the piston and housing are tightly fitted by piston rings, the piston rings wear after prolonged use and need to be replaced promptly, increasing maintenance costs. Utility Model Content

[0005] This invention proposes a residual charge detection device that can not only detect the relative amount of coagulant added, but also reduce maintenance costs and enable real-time monitoring.

[0006] Therefore, the technical solution adopted by this utility model is as follows: a residual charge detection device, including a residual charge sensor for detecting the amount of residual charge in a water sample after adding coagulant, the residual charge sensor including a detection tube through which the water sample after adding coagulant passes, a vertical magnetic field applied to the outside of the detection tube, electrodes provided on the front and rear side walls of the detection tube, and a wire for forming a current loop provided between the two electrodes, and a signal transmitter for measuring induced current provided on the current loop.

[0007] As a preferred embodiment of the above scheme, the electrode is provided with a protective sleeve for protecting the electrode.

[0008] Further preferably, it also includes an installation pipe for connecting the residual charge sensor to the water sample. The installation pipe includes a detection inlet pipe connected to the outlet pipe of the coagulation tank and a detection outlet pipe for discharging the tested water sample. The detection inlet pipe and the detection outlet pipe are respectively connected to both ends of the detection pipe. The detection inlet pipe is equipped with a flow meter, a detection valve and a water pump.

[0009] In a further preferred embodiment, a reversing assembly for changing the flow direction of the solution in the detection tube is also provided. The reversing assembly includes two three-way solenoid valves, one outlet of each three-way solenoid valve is connected to the detection tube through an intermediate connecting pipe, the other outlet of the two three-way solenoid valves is connected to the detection drainage pipe through an outlet connecting pipe and an outlet tee pipe, and the inlets of the two three-way solenoid valves are connected to the detection inlet pipe through an inlet connecting pipe and an inlet tee pipe.

[0010] In a further preferred embodiment, the detection tube is provided with fixing cylinders on both the upper and lower sides for mounting the magnetic body that forms the magnetic field.

[0011] More preferably, the magnetic field is generated by two permanent magnets of different polarities disposed on the upper and lower sides of the detection tube, or by two electromagnets disposed on the upper and lower sides of the detection tube, or by an electromagnet sleeved outside the detection tube.

[0012] The beneficial effects of this utility model are:

[0013] 1) A vertical magnetic field is applied outside the detection tube. When the water sample reacts with the coagulant and flows through the detection tube, the positive and negative ions in the solution are deflected by the Lorentz force and accumulate on the front and back side walls of the water tube, thereby generating an electric field perpendicular to both the direction of the water flow and the magnetic field. This electric field will induce a current in the external circuit of the electrode. This current is the reference current of the solution. When the coagulant is insufficient or excessive, the colloid flowing through the detection tube will be negatively or positively charged. According to the left-hand rule, it will generate an induced current, which will be detected by the signal transmitter. The signal transmitter will amplify the induced current signal and output it to the controller to control the dosing pump, thereby realizing the automatic adjustment of the coagulant dosage.

[0014] 2) Since the amount of charge gathered on the front and back sides is equal, the two electrodes can achieve charge neutralization after being connected by wires, and there will be no charge accumulation. Under the flushing of the flowing solution, no impurities will accumulate, and there is no need to clean the electrodes regularly. In addition, a reversing component is set to periodically change the flow direction of the solution flowing through the detection tube, so that the electrodes will not polarize.

[0015] 3) Compared with the prior art, this application achieves the detection of the solution flowing through the detection tube by applying a vertical magnetic field on both the upper and lower sides of the detection tube. Under the flushing of the flowing solution, impurities will not accumulate in the detection tube, so the electrode will not be contaminated and there is no need for regular cleaning and maintenance, thus ensuring real-time monitoring of the coagulant dosage; at the same time, there is no wear inside the detection tube, so there will be no maintenance costs due to wear. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of existing technology.

[0017] Figure 2 This is a schematic diagram of the residual charge sensor in this utility model.

[0018] Figure 3 This is a schematic diagram of the present invention.

[0019] Figure 4 This is a schematic diagram of the commutation assembly in this utility model. Figure 1(The arrows in the diagram indicate the direction of solution flow.)

[0020] Figure 5 This is a schematic diagram of the commutation assembly in this utility model. Figure 2 (The arrows in the diagram indicate the direction of solution flow.)

[0021] Figure 6 This is a three-dimensional schematic diagram of an embodiment of the residual charge sensor in this utility model.

[0022] Figure 7 This is a schematic diagram of an embodiment of the residual charge sensor in this utility model. Figure 1 .

[0023] Figure 8 This is a schematic diagram of an embodiment of the residual charge sensor in this utility model. Figure 2 .

[0024] Reference numerals: Residual charge sensor-100, detection tube-110, magnetic field-120, electrode-130, wire-140, signal transmitter-150, protective sleeve-160, fixed cylinder-170, flow meter-210, water pump-220, detection inlet pipe-230, detection outlet pipe-240, detection valve-250, three-way solenoid valve-410, intermediate connecting pipe-420, outlet connecting pipe-430, outlet tee pipe-440, inlet connecting pipe-460, inlet tee pipe-470. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0026] like Figures 2-8 As shown, a residual charge detection device is mainly a residual charge sensor 100 used to detect the amount of residual charge in the solution after the coagulant reaction. The residual charge sensor includes a detection tube 110, a magnetic field 120, a signal transmitter 150, and two electrodes 130. The detection tube 110 allows the solution after the coagulant reaction to pass through. The magnetic field 120 is applied outside the detection tube 110, extending vertically and perpendicular to the axis of the detection tube 110. The two electrodes 130 are respectively disposed on the front and rear side walls of the detection tube 110, and a sealing element is provided between each electrode 130 and the detection tube 110. A wire 140 for forming a current loop is provided between the two electrodes 130. The signal transmitter 150 is disposed on the current loop formed by the wire and is used to measure the direction and magnitude of the current in the current loop.

[0027] The working principle of the residual charge sensor is as follows: A vertical magnetic field is applied outside the detection tube. When the water sample, after reacting with the coagulant, flows through the detection tube, the positive and negative ions in the solution are deflected by the Lorentz force and accumulate on the front and back walls of the water pipe, generating an electric field perpendicular to both the water flow and the magnetic field. This electric field induces a current in the external circuit of the electrode, which serves as the reference current for the solution. Typically, colloids in surface water carry a negative charge. If insufficient coagulant is added, the remaining negatively charged colloids, when passing through the magnetic field, will generate an induced current in the opposite direction to the reference current, according to the left-hand rule. According to the superposition theorem in circuit analysis, the current detected by the transmitter is less than the reference current. In other words, if the transmitter detects an induced current less than the reference current, it indicates insufficient coagulant dosage, requiring an increase in the coagulant amount. When an excessive amount of positively charged coagulant is added, the colloid will also carry a positive charge. When it passes through a magnetic field, it will generate an induced current in the same direction as the reference current. According to the superposition theorem in circuit analysis, the current detected by the transmitter in this case is greater than the reference current. In other words, if the transmitter detects an induced current greater than the reference current, it indicates that the coagulant has been added in excess, and the dosage of coagulant needs to be reduced. The transmitter amplifies the induced current signal and outputs it to the controller to control the dosing pump, thereby achieving automatic adjustment of the coagulant dosage.

[0028] To enable the residual charge sensor to access water samples after reaction with the coagulant, an installation pipeline is provided. This pipeline includes a detection inlet pipe 230 connected to the effluent pipe of the coagulation tank and a detection outlet pipe 240 for discharging the tested solution. The detection inlet pipe 230 and the detection outlet pipe 240 are respectively connected to both ends of the detection pipe 110. A flow meter 210, a detection valve 250, and a water pump 220 are installed on the detection inlet pipe 230. The water pump 220 is a variable frequency pump. The controller adjusts the pump speed based on the flow signal fed back from the flow meter 210, achieving constant flow rate for water sample collection, eliminating the influence of water volume fluctuations on the detection, and ensuring the accuracy of the detection results.

[0029] To prevent electrode polarization after prolonged use, a reversing assembly is also provided to change the flow direction of the solution within the detection tube 110. Specifically, such as... Figure 3 , 4 As shown in Figure 5, the reversing assembly includes two three-way solenoid valves 410, and one outlet of each three-way solenoid valve 410 is connected to the detection pipe 110 through an intermediate connecting pipe 420. The other outlet of the two three-way solenoid valves 410 is connected to the detection drainage pipe 240 through an outlet connecting pipe 430 and an outlet tee pipe 440. The inlets of the two three-way solenoid valves 410 are connected to the detection inlet pipe 230 through an inlet connecting pipe 460 and an inlet tee pipe 470.

[0030] The magnetic field 120 can be generated by two permanent magnets of different polarities set on the upper and lower sides of the detection tube 110, or by two electromagnets set on the upper and lower sides of the detection tube 110, or by an electromagnet sleeved outside the detection tube 110.

[0031] Preferably, a protective sleeve 160 is provided outside the electrode 130 to protect the electrode 130. Fixing cylinders 170 are provided on both the upper and lower sides of the detection tube 110 for mounting the magnetic body that forms the magnetic field. Specifically, the protective sleeve and fixing cylinders are integrally formed with the detection tube as a shell.

[0032] It also includes a controller and a dosing pump for adding coagulant. The frequency converter, sampling water pump, flow meter, dosing pump and residual charge sensor are all electrically connected to the controller. The controller adopts a single-chip microcomputer with information transmission, information reception, information processing and interaction functions in the existing technology.

Claims

1. A residual charge detection device, characterized in that: The device includes a residual charge sensor (100) for detecting the amount of residual charge in a water sample after coagulant addition. The residual charge sensor (100) includes a detection tube (110) through which the water sample reacts with the coagulant passes. A vertical magnetic field (120) is applied to the outside of the detection tube (110). Electrodes (130) are provided on the front and rear side walls of the detection tube (110), and a wire (140) for forming a current loop is provided between the two electrodes (130). A signal transmitter (150) for measuring the induced current is provided on the current loop.

2. The residual charge detection device according to claim 1, characterized in that: The electrode (130) is provided with a protective sleeve (160) for protecting the electrode (130).

3. The residual charge detection device according to claim 1, characterized in that: It also includes an installation pipe for connecting the residual charge sensor to the water sample. The installation pipe includes a detection inlet pipe (230) connected to the outlet pipe of the coagulation tank and a detection outlet pipe (240) for discharging the tested water sample. The detection inlet pipe (230) and the detection outlet pipe (240) are respectively connected to the two ends of the detection pipe (110). The detection inlet pipe (230) is equipped with a flow meter (210), a detection valve (250) and a water pump (220).

4. The residual charge detection device according to claim 3, characterized in that: A reversing assembly for changing the flow direction of the solution in the detection tube (110) is also provided. The reversing assembly includes two three-way solenoid valves (410), and one outlet of each three-way solenoid valve (410) is connected to the detection tube (110) through an intermediate connecting pipe (420). The other outlet of the two three-way solenoid valves (410) is connected to the detection drainage pipe (240) through an outlet connecting pipe (430) and an outlet tee pipe (440). The inlets of the two three-way solenoid valves (410) are connected to the detection water inlet pipe (230) through an inlet connecting pipe (460) and an inlet tee pipe (470).

5. The residual charge detection device according to claim 1, characterized in that: The detection tube (110) is provided with a fixing cylinder (170) on both the upper and lower sides for mounting the magnetic body that forms the magnetic field.

6. The residual charge detection device according to claim 1, characterized in that: The magnetic field (120) is generated by two permanent magnets of different polarities set on the upper and lower sides of the detection tube (110), or by two electromagnets set on the upper and lower sides of the detection tube (110), or by an electromagnet sleeved outside the detection tube (110).

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