阅读说明：本技术 一种摆动式余氯传感器 (Swing type residual chlorine sensor ) 是由 高晓昆 程立 刘新贵 于 2020-12-04 设计创作，主要内容包括：本发明公开了一种摆动式余氯传感器,包括管壳、安装基座、端帽、偏心转动装置、摆动装置、球珠、阴极、阳极、温度传感器和控制电路板,所述端帽上设置有网孔,所述球珠设置在端帽内,所述管壳、安装基座和端帽从上至下依次固定连接；所述偏心转动装置和控制电路板均固定在管壳内,所述摆动装置的上端与偏心转动装置固定连接,下端穿过安装基座进入端帽内；所述阴极固定在摆动装置的下端,偏心转动装置通过摆动装置控制阴极作圆周运动；所述阳极和温度传感器均固定在安装基座上,所述控制电路板分别与阴极、阳极、温度传感器和偏心转动装置连接。本发明解决了现有余氯传感器不能准确测量溶液余氯值和不便于清洗阴极的技术问题。(The invention discloses a swing type residual chlorine sensor which comprises a pipe shell, a mounting base, an end cap, an eccentric rotating device, a swing device, a ball, a cathode, an anode, a temperature sensor and a control circuit board, wherein the end cap is provided with meshes, the ball is arranged in the end cap, and the pipe shell, the mounting base and the end cap are sequentially and fixedly connected from top to bottom; the eccentric rotating device and the control circuit board are fixed in the tube shell, the upper end of the swinging device is fixedly connected with the eccentric rotating device, and the lower end of the swinging device penetrates through the mounting base to enter the end cap; the cathode is fixed at the lower end of the swinging device, and the eccentric rotating device controls the cathode to do circular motion through the swinging device; the anode and the temperature sensor are fixed on the mounting base, and the control circuit board is connected with the cathode, the anode, the temperature sensor and the eccentric rotating device respectively. The invention solves the technical problems that the existing residual chlorine sensor can not accurately measure the residual chlorine value of the solution and is inconvenient to clean the cathode.)

1. A swing type residual chlorine sensor is characterized in that: the device comprises a tube shell (1), a mounting base (2), an end cap (3), an eccentric rotating device (4), a swinging device (5), a ball (6), a cathode (7), an anode (8), a temperature sensor (9) and a control circuit board (10), wherein the end cap (3) is provided with meshes, the ball (6) is arranged in the end cap (3), and the tube shell (1), the mounting base (2) and the end cap (3) are fixedly connected in sequence from top to bottom; the eccentric rotating device (4) and the control circuit board (10) are fixed in the tube shell (1), the upper end of the swinging device (5) is fixedly connected with the eccentric rotating device (4), and the lower end of the swinging device penetrates through the mounting base (2) and enters the end cap (3); the cathode (7) is fixed at the lower end of the swinging device (5), and the eccentric rotating device (4) controls the cathode (7) to do circular motion through the swinging device (5); the anode (8) and the temperature sensor (9) are fixed on the mounting base (2), and the control circuit board (10) is connected with the cathode (7), the anode (8), the temperature sensor (9) and the eccentric rotating device (4) respectively.

2. The oscillating chlorine residual sensor according to claim 1, characterized in that: the mounting base (2) is of a hollow cylindrical structure, a limiting ring (11) which divides the mounting base (2) into an upper base (12) and a lower base (13) is arranged on the mounting base (2), the upper base (12) and the lower base (13) are respectively fixedly connected with the tube shell (1) and the end cap (3), the anode (8) is fixed outside the lower base (13), and the temperature sensor (9) is fixed outside or inside the lower base (13); a plurality of switching terminals (14) are arranged on the upper base (12), and the cathode (7), the anode (8) and the temperature sensor (9) are respectively connected with the control circuit board (10) through the switching terminals (14); a plurality of water holes (15) penetrating through the pipe wall are transversely arranged on the lower base (13), a filter screen (16) corresponding to the water holes (15) is fixed in the lower base (13), and the aperture of the meshes of the filter screen (16) is smaller than the diameter of the ball (6).

3. The oscillating chlorine residual sensor according to claim 2, characterized in that: the mounting base (2) is vertically provided with a wiring channel in the pipe wall, and the anode (8) and the temperature sensor (9) are respectively connected with the switching terminal (14) through the wiring channel.

4. The oscillating chlorine residual sensor according to claim 2, characterized in that: the eccentric rotating device (4) comprises a motor (17), a rotating shaft (18), a transmission convex block (19), a transmission concave block (20), a sleeve (21), a large bearing (22) and a small bearing (23), wherein the motor (17) and the large bearing (22) are fixed in the tube shell (1), the transmission convex block (19) is fixedly connected with the motor (17) through the rotating shaft (18), the transmission concave block (20) is installed in the large bearing (22), two ends of the transmission concave block (20) are respectively fixedly connected with the transmission convex block (19) and the sleeve (21), and the axes of the rotating shaft (18), the transmission convex block (19), the transmission concave block (20), the sleeve (21) and the large bearing (22) are all overlapped; the small bearing (23) is eccentrically fixed in the sleeve (21) and is fixedly connected with the swinging device (5); the motor (17) drives the transmission convex block (19), the transmission concave block (20) and the sleeve (21) to synchronously rotate through the rotating shaft (18), and the sleeve (21) drives the swinging device (5) to do circular motion through the small bearing (23).

5. The oscillating chlorine residual sensor according to claim 4, characterized in that: be equipped with strutting arrangement in tube (1), strutting arrangement includes support column (24) and supporting seat (25), and supporting seat (25) are fixed on upper base (12) through support column (24), are provided with the step through-hole on supporting seat (25), and motor (17) are installed in the top of supporting seat (25), and axis of rotation (18), transmission lug (19), transmission concave block (20), sleeve (21) and big bearing (22) are all installed in the step through-hole.

6. The oscillating chlorine residual sensor according to claim 4 or 5, characterized in that: the swinging device (5) comprises a swinging shaft (26), a swinging rod (27), an anti-rotation assembly (28) and a fixed rubber ring (31), wherein the swinging shaft (26) is made of metal, the fixed rubber ring (31) is fixed on the swinging shaft (26) and used for sealing and preventing the swinging shaft (26) from moving, the anti-rotation assembly (28) is respectively fixed on the swinging shaft (26) and an upper base (12), the upper end of the swinging shaft (26) is fixedly connected with a small bearing (23), two ends of the swinging rod (27) are respectively fixedly connected with the lower end of the swinging shaft and a cathode (7), and the cathode (7) is connected with a switching terminal (14) through the swinging shaft (26) and the anti-rotation assembly (28).

7. The oscillating chlorine residual sensor according to claim 6, characterized in that: the anti-rotation assembly (28) comprises an anti-rotation insulating stop rod (29) and an anti-rotation screw rod (30) connected with the switching terminal (14), the anti-rotation screw rod (30) is made of metal, one end of the anti-rotation screw rod is fixed on the swinging shaft (26), and the other end of the anti-rotation screw rod is positioned above the upper base (12); the anti-rotation insulating stop rod (29) is fixed on the end surface of the upper base (12), and the anti-rotation insulating stop rod (29) is positioned on two sides of the anti-rotation screw rod (30).

8. The oscillating chlorine residual sensor according to claim 6, characterized in that: the swing rod (27) is of a hollow structure, a nut (32) made of metal materials is embedded in the upper end of the swing rod, the swing shaft (26) is connected with the swing rod (27) through the nut (32), and the cathode (7) is connected with the nut (32) through a lead.

9. The oscillating chlorine residual sensor according to any one of claims 1 to 5, characterized in that: the upper end of tube shell (1) is fixed with pipe cap (33), pipe cap (33) are including pipe cap (34), support (35) and binding post (36), and pipe cap (34) are fixed at the tip of tube shell (1) through support (35), and control circuit board (10) are fixed in tube shell (1) through support (35), and binding post (36) are fixed on pipe cap (34) to be connected with control circuit board (10), external power source (44) and data acquisition equipment (43) respectively.

10. The oscillating chlorine residual sensor according to claim 9, characterized in that: the control circuit board (10) comprises a power module (42), a measuring module (37), a processing module (38), a communication module (39), a storage module (41) and a control module (40), wherein the power module (42) is connected with an external power supply (44) through a wiring terminal (36) and supplies power to the measuring module (37), the processing module (38), the communication module (39), the storage module (41), the control module (40) and the eccentric rotating device (4); the processing module (38) is respectively connected with the measuring module (37), the communication module (39), the storage module (41) and the control module (40), the communication module (39) is connected with external data acquisition equipment (43) through a wiring terminal (36), the measuring module (37) is respectively connected with the cathode (7), the anode (8) and the temperature sensor (9), and the control module (40) is connected with the eccentric rotating device (4).

Technical Field

The invention relates to the field of sensors, in particular to a swing type residual chlorine sensor.

Background

The residual chlorine sensor is also called a residual chlorine electrode or a residual chlorine probe and is used for continuously monitoring residual chlorine in water. The device is mainly suitable for measuring residual chlorine, chlorine dioxide or dissolved ozone in the water making industry and the filling industry, is also suitable for on-line monitoring of residual chlorine concentration of drinking water and residual chlorine concentration of water disinfection and sterilization process in the industrial process, and can also be used in places needing residual chlorine concentration measurement, such as swimming pools and the like.

The residual chlorine sensor can be divided into a colorimetric residual chlorine sensor and an electrode residual chlorine sensor according to different measuring principles, wherein the colorimetric method is frequently used for water samples with complex water quality and large changes due to few influencing factors, and the electrode method is frequently used for real-time online continuous monitoring due to the fact that a measuring result can be rapidly obtained. An electrode-based residual chlorine sensor (hereinafter, the residual chlorine sensor refers to an electrode-based residual chlorine sensor) has two electrodes, a cathode and an anode, and residual chlorine can be reduced on the cathode by setting a proper polarization voltage between the cathode and the anode, and chemical reactions produce a current proportional to the concentration of residual chlorine in a measured solution, and the current is converted into a standard output signal by an electronic circuit of a controller and displayed by a detection device or the controller.

The main factors influencing the measurement accuracy of the residual chlorine sensor are as follows: 1) The water flow speed of the solution to be measured flowing through the cathode has great influence on the measurement result; 2) the cathode used as a working electrode needs to be continuously cleaned to ensure the accuracy of the measured data; 3) the water temperature and pH of the solution being measured have a large effect on the measurement results.

In order to solve the technical problems, the prior art with chinese patent publication No. CN109916986A discloses a self-cleaning digital chlorine sensor in 2019, 6/21.a cavity for accommodating balls is formed by matching a net-shaped housing of an end cap with a baffle, and a stirring shaft is driven by a micro motor to drive a cathode to rotate and rub the balls in the end cap during rotation, so that a self-cleaning function of a gold electrode is realized. The micro motor can be controlled by the multifunctional circuit board to run at fixed time and fixed speed according to different water quality conditions, so that the problems of unstable or discontinuous water flow rate, unstable measured value and inaccuracy of different water qualities are solved. The multifunctional circuit board is electrically connected with the cathode and the anode as a controller of the residual chlorine sensor, on one hand, the multifunctional circuit board can control the motor to operate, on the other hand, the multifunctional circuit board can measure a current signal which is in direct proportion to residual chlorine in the measured liquid, and the current signal is processed and converted into a digital signal to be output outwards, so that the digital output function of the residual chlorine sensor is realized, and the stability of data transmission is ensured. However, in practice, this technique has some drawbacks that make it difficult to achieve the purpose of accurately measuring residual chlorine: 1) the cathode of the technology is designed and installed on the central shaft of the stirring shaft, the stirring shaft is designed to rotate along with the rotation of the motor, and under the design scheme, the cathode exposed outside is very small, so that the actual operation range of the cathode is very small, although the cathode rotates ceaselessly, the position change is not obvious relative to the measured solution near the cathode, and the change of the water flow speed of the measured solution flowing through the cathode is not obvious compared with the actual water flow speed, so that the problem that the water flow speed affects the measurement result cannot be really solved; in addition, because the actual operation range of the cathode is very small, the effect of polishing and cleaning the cathode by using water flow to drive the ball is not obvious; 2) according to the technology, the anode is designed and installed in the upper space of the end cap, the solution to be measured can only enter the space through the gap between the avoidance hole in the baffle and the ball head, the solution to be measured can hardly flow after entering the space, the solution to be measured entering the space can be different from the actual solution to be measured without much time, and therefore the measurement accuracy is greatly influenced; 3) the technology does not consider the influence of the water temperature of the measured solution on the residual chlorine value, and the influence of the water temperature on the residual chlorine measurement value is large in practice.

Disclosure of Invention

The invention aims to overcome the technical problems in the prior art, provides a swing type residual chlorine sensor and solves the technical problems that the existing residual chlorine sensor cannot accurately measure the residual chlorine value of a solution and is inconvenient to clean a cathode.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a swing type residual chlorine sensor is characterized in that: the device comprises a tube shell, a mounting base, an end cap, an eccentric rotating device, a swinging device, a ball, a cathode, an anode, a temperature sensor and a control circuit board, wherein the end cap is provided with meshes, the ball is arranged in the end cap, and the tube shell, the mounting base and the end cap are sequentially and fixedly connected from top to bottom; the eccentric rotating device and the control circuit board are fixed in the tube shell, the upper end of the swinging device is fixedly connected with the eccentric rotating device, and the lower end of the swinging device penetrates through the mounting base to enter the end cap; the cathode is fixed at the lower end of the swinging device, and the eccentric rotating device controls the cathode to do circular motion through the swinging device; the anode and the temperature sensor are fixed on the mounting base, and the control circuit board is connected with the cathode, the anode, the temperature sensor and the eccentric rotating device respectively.

The mounting base is of a hollow cylindrical structure, a limiting ring for dividing the mounting base into an upper base and a lower base is arranged on the mounting base, the upper base and the lower base are respectively and fixedly connected with the tube shell and the end cap, the anode is fixed outside the lower base, and the temperature sensor is fixed outside or inside the lower base; the upper base is provided with a plurality of adapter terminals, and the cathode, the anode and the temperature sensor are respectively connected with the control circuit board through the adapter terminals; a plurality of water holes penetrating through the pipe wall are transversely arranged on the lower base, a filter screen corresponding to the water holes is fixed in the lower base, and the aperture of the mesh of the filter screen is smaller than the diameter of the ball.

The mounting base is characterized in that a wiring channel is vertically arranged in the pipe wall of the mounting base, and the anode and the temperature sensor are respectively connected with the switching terminal through the wiring channel.

The eccentric rotating device comprises a motor, a rotating shaft, a transmission convex block, a transmission concave block, a sleeve, a large bearing and a small bearing, wherein the motor and the large bearing are fixed in a tube shell; the small bearing is eccentrically fixed in the sleeve and is fixedly connected with the swinging device; the motor drives the transmission convex block, the transmission concave block and the sleeve to synchronously rotate through the rotating shaft, and the sleeve drives the swinging device to do circular motion through the small bearing.

Be equipped with strutting arrangement in the tube, strutting arrangement includes support column and supporting seat, and the supporting seat passes through the support column to be fixed on the upper base, is provided with the step through-hole on the supporting seat, and the motor is installed in the top of supporting seat, and axis of rotation, transmission lug, transmission concave block, sleeve and big bearing are all installed in the step through-hole.

The swinging device comprises a swinging shaft, a swinging rod, an anti-rotation assembly and a fixed rubber ring, the swinging shaft is made of metal, the fixed rubber ring is fixed on the swinging shaft and used for sealing and preventing the swinging shaft from moving, the anti-rotation assembly is fixed on the swinging shaft and an upper base respectively, the upper end of the swinging shaft is fixedly connected with a small bearing, two ends of the swinging rod are fixedly connected with the lower end and the cathode of the swinging shaft respectively, and the cathode is connected with a switching terminal through the swinging shaft and the anti-rotation assembly.

The anti-rotation assembly comprises an anti-rotation insulating stop rod and an anti-rotation screw rod connected with the switching terminal, the anti-rotation screw rod is made of metal, one end of the anti-rotation screw rod is fixed on the swinging shaft, and the other end of the anti-rotation screw rod is positioned above the upper base; the anti-rotation insulating stop lever is fixed on the end face of the upper base and located on two sides of the anti-rotation screw.

The swing rod is of a hollow structure, a nut made of metal materials is embedded in the upper end of the swing rod, the swing shaft is connected with the swing rod through the nut, and the cathode is connected with the nut through a lead.

The upper end of tube is fixed with the pipe cap, the pipe cap includes tube cap, support and binding post, and the tube cap passes through the support to be fixed at the tip of tube, and control circuit board passes through the support to be fixed in the tube, and binding post fixes on the tube cap to be connected with control circuit board, external power supply and data acquisition equipment respectively.

The control circuit board comprises a power supply module, a measuring module, a processing module, a communication module, a storage module and a control module, wherein the power supply module is connected with an external power supply through a wiring terminal and supplies power to the measuring module, the processing module, the communication module, the storage module, the control module and the eccentric rotating device; the processing module is respectively connected with the measuring module, the communication module, the storage module and the control module, the communication module is connected with external data acquisition equipment through a wiring terminal, the measuring module is respectively connected with the cathode, the anode and the temperature sensor, and the control module is connected with the eccentric rotating device.

The invention has the advantages that:

1. the invention uses the specially designed eccentric rotating device to match with the swinging device, so that the cathode can only do circular motion but not can do rotary motion. And the lever principle is adopted, the small-amplitude circular motion of the upper end of the swinging device can be amplified into the larger-amplitude circular motion of the lower end cathode, and on the basis, when the speed of the circular motion of the cathode is much larger than the natural water flow speed of the solution to be measured, the water flow speed of the solution to be measured flowing through the cathode is mainly determined by the speed of the circular motion of the cathode, namely the natural water flow speed of the solution to be measured can be ignored and kept unknown, so that the obtained measurement result has no obvious relation with the natural water flow speed of the solution to be measured, the problem of influence of the water flow speed on the residual chlorine measurement value is solved, and the measurement precision of the residual chlorine is effectively improved.

2. The motion of the cathode is circular motion with larger amplitude, rather than rotary motion in situ, so that the friction and collision between the cathode and the ball are obvious and effective, and the self-cleaning of the cathode can be realized more effectively.

3. The temperature sensor is added, the water temperature is measured while the residual chlorine value of the solution to be measured is measured, and the control circuit board can correct the measured residual chlorine value according to the function of the influence of the water temperature on the residual chlorine value, so that the influence of the water temperature on the residual chlorine measurement is eliminated, and the residual chlorine measurement precision is further improved.

4. The anti-rotation component which enables the swinging shaft to only do circular motion but not rotate is arranged in the swinging device, so that a metal wire connected with the swinging shaft is easier to design and install, for example, a spring made of metal can perfectly solve the problem of wire connection, and the safety after connection is better. However, if the rocking shaft is rotated, it is difficult to lead out from the rocking shaft, and there are problems such as poor contact and sparking. In addition, if the swing shaft is to rotate with the motor, the sealing becomes an unsolved problem.

5. According to the invention, the anode is arranged on the outer surface of the residual chlorine sensor and can be in direct contact with the flowing solution to be measured, and the design can avoid measurement distortion caused by the change of the solution to be measured when the anode is arranged in the cavity in which the solution to be measured hardly flows.

6. The invention is characterized in that a plurality of water holes penetrating through the pipe wall are transversely arranged on a lower base, and a filter screen corresponding to the water holes is fixed in the lower base. On the one hand, the water flow flowing through the cathode is smoother, the water inlet pipe is required to face the cathode from bottom to top when the residual chlorine sensor is installed, the water flow can flow out through the cathode, the inner hole of the installation base, the water hole of the pipe wall of the installation base and the water outlet pipe, no vortex can be generated, and on the other hand, the ball can be prevented from flowing out along with the water flow.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a cap according to the present invention;

FIG. 3 is a schematic structural view of a fixing base according to the present invention;

FIG. 4 is a schematic view showing the construction of the rotating unit according to the present invention before installation;

FIG. 5 is a schematic view of the rotating device of the present invention after installation;

FIG. 6 is a cross-sectional view of the small bearing and sleeve of the present invention after installation;

FIG. 7 is a schematic view of the support device of the present invention;

FIG. 8 is a schematic view of the structure of the swing device of the present invention;

FIG. 9 is a schematic view of an anti-rotation assembly of the present invention;

FIG. 10 is a functional diagram of a control circuit board according to the present invention;

labeled as: 1. a housing, 2, a mounting base, 3, an end cap, 4, an eccentric rotation device, 5, a swing device, 6, a ball, 7, a cathode, 8, an anode, 9, a temperature sensor, 10, a control circuit board, 11, a limit ring, 12, an upper base, 13, a lower base, 14, a transfer terminal, 15, a water hole, 16, a filter screen, 17, a motor, 18, a rotation shaft, 19, a transmission lug, 20, a transmission concave block, 21, a sleeve, 22, a large bearing, 23, a small bearing, 24, a support column, 25, a support base, 26, a swing shaft, 27, a swing rod, 28, an anti-rotation component, 29, an anti-rotation insulating stop rod, 30, an anti-rotation screw rod, 31, a fixed rubber ring, 32, a nut, 33, a pipe cap, 34, a pipe cover, 35, a bracket, 36, a connection terminal, 37, a measurement module, 38, a processing module, 39, a communication module, 40, a control module, 41, a, 42. power module, 43, data acquisition equipment, 44, external power supply.

Detailed Description

The invention provides a swing type residual chlorine sensor which can realize accurate measurement of residual chlorine and effective self-cleaning of a cathode 7, and the structure of the swing type residual chlorine sensor is shown in figure 1, and the swing type residual chlorine sensor comprises a pipe shell 1, a mounting base 2, an end cap 3, a pipe cap 33, an eccentric rotating device 4, a swing device 5, a ball 6, a cathode 7, an anode 8, a temperature sensor 9 and a control circuit board 10. The tube shell 1 is preferably of a hollow cylindrical structure, and the tube cap 33, the tube shell 1, the mounting base 2 and the end cap 3 are fixedly connected from top to bottom in sequence. The end cap 3 is provided with meshes, and the ball 6 is arranged in the end cap 3. The eccentric rotating device 4 and the control circuit board 10 are both fixed in the tube shell 1, the upper end of the swinging device 5 is fixedly connected with the eccentric rotating device 4, and the lower end of the swinging device penetrates through the mounting base 2 and enters the end cap 3. The cathode 7 is fixed at the lower end of the swinging device 5, and the eccentric rotating device 4 controls the cathode 7 to do circular motion through the swinging device 5. The anode 8 and the temperature sensor 9 are both fixed on the mounting base 2, and preferably the anode 8 is located outside the mounting base 2, and the temperature sensor 9 is located outside or inside the mounting base 2. The control circuit board 10 is respectively connected with the cathode 7, the anode 8, the temperature sensor 9 and the eccentric rotating device 4.

The structure, position and connection relationship of the components of the present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 2, the cap 33 is fixed on the upper end of the package 1, the cap 33 includes a cap 34, a bracket 35 and a terminal 36, the cap 34 is fixed on the end of the package 1 through the bracket 35, and the cap 34 can block the package 1 after fixing. The support 35 is also a mounting for the control circuit board 10, and the control circuit board 10 is fixed in the housing 1 by the support 35. The connecting terminal 36 is fixed on the tube cover 34, the lower end of the connecting terminal is positioned in the tube shell 1, and the connecting terminal is linearly connected with the control circuit board 10; the upper end of the shell is positioned outside the shell 1 and is connected with an external power supply 44 and data acquisition equipment 43.

As shown in fig. 3, the mounting base 2 is a hollow cylindrical structure, a limiting ring 11 is provided on the mounting base 2, the limiting ring 11 divides the mounting base 2 into an upper base 12 and a lower base 13, and the outer diameter of the lower base 13 is preferably slightly smaller than the outer diameter of the upper base 12. The upper end of the upper base 12 is fixed inside the lower end of the case 1, and the lower end of the lower base 13 is connected with the upper end of the end cap 3 through threads. The anode 8 is wound around the outside (outer surface) of the lower base 13 using a metal wire made of silver chloride. The temperature sensor 9 is fixed in the pipe wall of the lower base 13 by adopting a thermistor, and the thermistor is tightly contacted with the pipe wall of the lower base 13 through heat-conducting silicone grease. A plurality of switching terminals 14 are arranged on the upper end face of the upper base 12, and the cathode 7, the anode 8 and the temperature sensor 9 are respectively connected with the control circuit board 10 through the switching terminals 14; the lower base 13 is transversely provided with a plurality of water holes 15 penetrating through the pipe wall to communicate the inner space and the outer space of the mounting base 2. A filter screen 16 corresponding to the water hole 15 is fixed in the lower base 13, and the aperture of the mesh of the filter screen 16 is smaller than the diameter of the ball 6.

Furthermore, a wiring channel is vertically arranged in the tube wall of the mounting base 2, and the anode 8 and the temperature sensor 9 are respectively connected with the corresponding switching terminal 14 through the wiring channel.

The upper end opening of the end cap 3 is used for being fixedly connected with the lower base 13, and the end cap and the lower base can be conveniently disassembled and assembled. The periphery and the bottom surface of the end cap 3 are in a net shape. The number of the balls 6 is a plurality, the balls are placed in the end cap 3, and the diameter of the balls is larger than that of meshes on the end cap 3.

As shown in fig. 4-5, the eccentric rotating device 4 includes a motor 17, a rotating shaft 18, a transmission convex block 19, a transmission concave block 20, a sleeve 21, a large bearing 22 and a small bearing 23, the motor 17 and the large bearing 22 are both fixed in the case 1, the motor 17 is connected with the control circuit board 10, the transmission convex block 19 is fixedly connected with the motor 17 through the rotating shaft 18, the transmission concave block 20 is installed in the large bearing 22, both ends of the transmission concave block 20 are respectively fixedly connected with the transmission convex block 19 and the sleeve 21, and after the rotating shaft 18, the transmission convex block 19, the transmission concave block 20, the sleeve 21 and the large bearing 22 are installed, the axes thereof are all coincident, i.e. coaxial. The small bearing 23 is eccentrically fixed in the sleeve 21 and is fixedly connected to the oscillating device 5, i.e. the small bearing 23 is eccentrically mounted in the sleeve 21, as shown in fig. 6. When the motor 17 operates, the transmission convex block 19 is driven to rotate by the rotating shaft 18, the transmission convex block 19 synchronously drives the transmission concave block 20 and the sleeve 21 to rotate, and the sleeve 21 drives the small bearing 23 to do circular motion, so as to drive the swinging device 5 to do circular motion.

As shown in fig. 7, a supporting device is disposed in the case 1, the supporting device includes three supporting columns 24 and three supporting seats 25, the number of the supporting columns 24 is preferably three, the supporting seats 25 are fixed on the upper base 12 through the three supporting columns 24, and a certain distance is formed between the fixed supporting seats 25 and the upper base 12. The supporting seat 25 is provided with a step through hole, the motor 17 is fixedly arranged above the supporting seat 25, and the rotating shaft 18, the transmission convex block 19, the transmission concave block 20, the sleeve 21 and the large bearing 22 are all arranged in the step through hole.

As shown in fig. 8, the swing device 5 includes a swing shaft 26, a swing rod 27, a rotation-preventing assembly 28 and a fixed rubber ring 31, the swing shaft 26 is made of metal, an outer diameter of the fixed rubber ring 31 is matched with an inner diameter of the mounting base 2, the fixed rubber ring is fixed at a lower end of the swing shaft 26 for sealing and preventing the swing shaft 26 from moving, the rotation-preventing assembly 28 is respectively fixed on the swing shaft 26 and the upper base 12 for preventing the swing shaft 26 from rotating, and the swing shaft 26 can only make circular motion. The upper end of the swing shaft 26 is fixedly mounted on the inner shaft of the small bearing 23, the two ends of the swing rod 27 are respectively fixedly connected with the lower end of the swing shaft and the cathode 7, and the cathode 7 is connected with the switching terminal 14 through the swing shaft 26 and the anti-rotation assembly 28. When the oscillating shaft 26 makes a circular motion along with the small bearing 23, the oscillating lever 27 also makes a circular motion along with the oscillating shaft 26 with the fixed rubber ring 31 as a fulcrum, and since the length of the part below the fixed rubber ring 31 is several times of the length of the part above, the oscillation amplitude of the cathode 7 at the bottom end of the oscillating lever 27 is several times of the oscillation amplitude of the small bearing 23.

Further, as shown in fig. 9, the anti-rotation assembly 28 includes an anti-rotation insulating bar 29 and an anti-rotation screw 30 connected to the adaptor terminal 14, wherein the anti-rotation screw 30 is made of metal and can be connected to the corresponding adaptor terminal 14 through a wire or a spring made of metal. The anti-rotation screw 30 is horizontally arranged on the swinging shaft 26, one end of the anti-rotation screw is fixed on the swinging shaft 26, and the other end of the anti-rotation screw is positioned above the upper base 12; the number of the anti-rotation insulating stop rods 29 is preferably two, and the anti-rotation insulating stop rods 29 can be made of insulating materials or made of metal materials coated with insulating materials. An anti-rotation insulating bar 29 is fixed on an end surface of the upper base 12, and the anti-rotation insulating bar 29 is located at both sides of the anti-rotation screw 30. In use, the anti-rotation insulating stop 29 cooperates with the anti-rotation screw 30 to prevent rotation of the swing shaft.

Furthermore, the swing rod 27 is a hollow structure and made of plastic, a nut 32 made of metal is embedded at the upper end of the swing rod 27, the swing shaft 26 is connected with the swing rod 27 through the nut 32, the cathode 7 is connected with the nut 32 through a wire made of platinum wire, and the wire is routed from a hollow channel of the swing rod 27. Specifically, the cathode 7 and the control circuit board 10 are electrically connected through a lead, a nut 32, a swing rod 27 and an anti-rotation screw 30.

As shown in fig. 10, the control circuit board 10 includes a power module 42, a measurement module 37, a processing module 38, a communication module 39, a storage module 41 and a control module 40, wherein the power module 42 is connected to an external power source 44 through a connection terminal 36 to supply power to the measurement module 37, the processing module 38, the communication module 39, the storage module 41, the control module 40 and the eccentric rotation device 4; the processing module 38 is respectively connected with the measuring module 37, the communication module 39, the storage module 41 and the control module 40, the communication module 39 is connected with the external data acquisition device 43 through the wiring terminal 36, the measuring module 37 is respectively connected with the cathode 7, the anode 8 and the temperature sensor 9, and the control module 40 is connected with the eccentric rotating device 4. The power module 42 can convert the voltage input by the external power supply 44 into a voltage which can be used for designing the residual chlorine sensor and is supplied to each device, the measuring module 37 can measure the current value between the cathode 7 and the anode 8 and the resistance value of the thermistor, the processing module 38 can convert the measured value into a corresponding residual chlorine value and a corresponding temperature value according to a standard curve, the communication module 39 can transmit the calculation result to the corresponding data acquisition device 43 through the wiring terminal 36, the storage module 41 can store a part of the calculation result, and the control module 40 can control the operation of the motor 17.

The working principle of the invention is as follows:

1. the residual chlorine sensor is connected with an external power supply 44 and a data acquisition device 43 through a wiring terminal 36.

2. And putting the lower end of the residual chlorine sensor into the solution to be detected, and enabling the cathode 7 and the anode 8 to be positioned below the liquid level of the solution to be detected.

3. The control module 40 controls the motor 17 to operate, the motor 17 drives the transmission convex block 19 to rotate through the rotating shaft 18, the transmission convex block 19 synchronously drives the transmission concave block 20 and the sleeve 21 to rotate, and the sleeve 21 drives the small bearing 23 to do circular motion, so as to drive the cathode 7 arranged on the swinging device 5 to do circular motion.

4. The measuring module 37 can measure the current value between the cathode 7 and the anode 8 and the resistance value of the thermistor, and send the measured data to the processing module 38, and the processing module 38 calculates the measured result according to the measured data, and then stores the measured result in the storage module 41 on one hand, and sends the measured result to the data acquisition device 43 through the communication module 39 on the other hand, so as to measure the residual chlorine value.

In the above process, since the small bearing 23 is eccentrically installed in the sleeve 21, under the restriction of the anti-rotation assembly 28, when the swing shaft 26 makes a circular motion along with the small bearing 23, the swing rod 27 also makes a circular motion along with the swing shaft 26 with the fixed rubber ring 31 as a fulcrum, and since the length of the lower part of the fixed rubber ring 31 is several times that of the upper part, the swing amplitude of the cathode 7 at the bottom end of the swing rod 27 is several times that of the small bearing 23. Based on this, the water flow speed of the solution to be measured flowing through the cathode 7 is mainly determined by the speed of the circular motion of the cathode 7, and the processing module 38 can correct the measured residual chlorine value according to the water temperature. The combination of the two can effectively improve the measurement precision of the residual chlorine. In addition, the motion of the cathode 7 is circular motion with larger amplitude, and the friction and the collision between the cathode 7 and the ball 6 are obvious and effective, which is more beneficial to realizing the effective self-cleaning of the cathode 7.

By adopting the specific technical scheme, the invention effectively solves the technical problems that the residual chlorine value of the solution cannot be accurately measured and the cathode is not convenient to clean due to the influence of the water flow speed and the temperature of the existing residual chlorine sensor.

While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.