COD (Chemical Oxygen Demand) water quality analyzer
By using a variable frequency controlled geared motor and a permanent magnet ring design, the laminar flow problem caused by chloride ion oxidation in water COD detection is solved, improving the mixing effect and detection accuracy, while ensuring instrument cleanliness and achieving efficient COD detection.
Patent Information
- Application Number
- CN202422761858.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-13
AI Technical Summary
In COD testing of water quality, chloride ions are oxidized by oxidants, leading to higher test results. This is especially true in the testing of high-chlorine, low-COD wastewater where the mixing effect is poor, and existing mixing tanks are prone to laminar flow, affecting the accuracy of the test.
The mixing paddle is driven by a variable frequency controlled geared motor. Combined with the design of inner and outer permanent magnet rings to transmit torque, laminar flow is avoided and the mixing effect is improved. Friction is reduced by copper rings and sleeves, and the flushing system ensures detection accuracy.
It achieves a more efficient chloride ion removal rate, improves the accuracy of COD detection, and ensures instrument cleanliness through a rinsing system to avoid residues affecting the next test.
Smart Images
Figure CN223624229U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water quality analysis technology, specifically a COD water quality analyzer. Background Technology
[0002] In the process of COD detection and analysis of water quality, chloride ions in water samples are easily oxidized by oxidants. A large amount of chloride ions leads to higher test results. The determination of high-chlorine, low-COD wastewater is a current challenge. Many types of wastewater, such as chemical wastewater, monosodium glutamate wastewater, and seafood processing wastewater, have high chloride ion content. Currently, the common method is to add silver sulfate to the water sample for mixing and reaction to remove chloride ions. Ordinary mixing tanks use a geared motor to drive the agitator to rotate for mixing. The speed of the geared motor is fixed, which can easily lead to laminar flow when wastewater and silver sulfate are mixed, resulting in poor mixing effect. Utility Model Content
[0003] To overcome the above-mentioned shortcomings, this utility model provides a COD water quality analyzer.
[0004] The technical solution adopted by this utility model is as follows:
[0005] A COD water quality analyzer includes a cylinder, which is welded together with a base plate. A cover plate is sealed to the upper part of the cylinder via a flange and bolts. The cylinder, base plate, and cover plate form a reaction vessel. A cup-shaped cover is provided at the center of the base plate, with the opening of the cup-shaped cover facing downwards. A geared motor is provided on the lower side of the cup-shaped cover on the base plate. The geared motor is bolted to the base plate. The output shaft of the geared motor extends into the inner hole of the cup-shaped cover. An inner permanent magnet ring is embedded on the outer side of the output shaft. The inner permanent magnet ring is clearance-fitted with the inner hole of the cup-shaped cover. A stirring shaft is provided on the upper side of the cup-shaped cover. A clamping sleeve is provided at the lower part of the stirring shaft. An outer permanent magnet ring is embedded in the inner hole of the clamping sleeve. The outer permanent magnet ring is clearance-fitted with the outer circle of the cup-shaped cover. A support is connected to the upper part of the stirring shaft via a bearing. The support is bolted to the cover plate. A stirring paddle is installed on the stirring shaft.
[0006] The magnetic poles inside the outer permanent magnet ring are opposite to the magnetic poles outside the inner permanent magnet ring, and the geared motor is controlled by frequency conversion.
[0007] The bottom plate is equipped with a drain pipe, which is connected in parallel with a detection pipe and a sewage pipe. The detection pipe is equipped with a regulating valve and a COD detector, and the sewage pipe is equipped with a shut-off valve. The cover plate is equipped with a feed pipe, and the upper side of the cylinder is equipped with a flushing water pipe that enters the cylinder tangentially. Both the flushing water pipe and the feed pipe are equipped with shut-off valves.
[0008] A copper ring is provided between the clamping sleeve and the base plate, and a copper sleeve is provided between the clamping sleeve and the cup-shaped cover.
[0009] A breather valve is provided on the cover plate.
[0010] The beneficial effects of this utility model are:
[0011] The variable frequency drive controls the speed of the geared motor to change constantly. The non-constant speed of the stirring paddle prevents laminar flow when wastewater and silver sulfate are mixed, improving the removal rate of chloride ions and making COD detection more accurate. At the same time, it can rinse the COD detector and reaction tank after the test to avoid residues affecting the next test. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] Appendix Figure 2 It is attached Figure 1 Enlarged view of point A.
[0014] In the diagram: 1-Cylinder, 2-COD detector, 3-Gear motor, 4-Agitator, 5-Cover plate, 6-Breath valve, 7-Agitator shaft, 8-Support, 9-Feed pipe, 10-Rinse water pipe, 11-Regulating valve, 12-Drain pipe, 13-Detection pipe, 14-Sewage pipe, 15-Bottom plate, 16-Cup-shaped cover, 17-Outer permanent magnet ring, 18-Inner permanent magnet ring, 19-Copper ring, 20-Copper sleeve, 21-Clamping sleeve, 22-Output shaft. Detailed Implementation
[0015] like Figure 1-2 As shown: A COD water quality analyzer includes a cylinder 1, which is welded together with a base plate 15. A cover plate 5 is sealed to the upper part of the cylinder 1 via a flange and bolts. The cylinder 1, base plate 15, and cover plate 5 form a reaction vessel. A cup-shaped cover 16 is provided at the center of the base plate 15, with the opening of the cup-shaped cover 16 facing downwards. A geared motor 3 is provided on the lower side of the cup-shaped cover 16 on the base plate 15. The geared motor 3 is bolted to the base plate 15, and the output shaft 22 of the geared motor 3 extends into the cup-shaped cover 16. The inner hole of the cup-shaped cover 16 has an inner permanent magnet ring 18 embedded on the outer side of the output shaft 22. The inner permanent magnet ring 18 is in clearance fit with the inner hole of the cup-shaped cover 16. The upper side of the cup-shaped cover 16 is provided with a stirring shaft 7. The lower part of the stirring shaft 7 is provided with a clamping sleeve 21. The inner hole of the clamping sleeve 21 is inlaid with an outer permanent magnet ring 17. The outer permanent magnet ring 17 is in clearance fit with the outer circle of the cup-shaped cover 16. The upper part of the stirring shaft 7 is connected to a support 8 through a bearing. The support 8 is connected to the cover plate 5 by bolts. The stirring shaft 7 is equipped with a stirring paddle 4.
[0016] The inner hole magnetic poles of the outer permanent magnet ring 17 are opposite to the outer circular magnetic poles of the inner permanent magnet ring 18. The two magnetically attract each other to transmit torque. This structure allows the geared motor 3 to drive the stirring paddle 4 without being connected to each other, avoiding leakage caused by the ordinary stirring shaft 7 extending into the reaction vessel.
[0017] The geared motor 3 is controlled by a frequency converter, which changes the speed of the geared motor 3 at any time. The non-constant speed of the stirring paddle 4 prevents laminar flow when wastewater and silver sulfate are mixed, thus improving the removal rate of chloride ions and making COD detection more accurate.
[0018] The bottom plate 15 is provided with a drain pipe 12, which is connected in parallel with a detection pipe 13 and a sewage pipe 14. The detection pipe 13 is provided with a regulating valve 11 and a COD detector 2. The regulating valve 11 is used to regulate the flow rate into the COD detector 2. The sewage pipe 14 is provided with a shut-off valve. The cover plate 5 is provided with a feed pipe 9 for introducing sewage and silver sulfate. The upper side of the cylinder 1 is provided with a flushing water pipe 10. The flushing water pipe 10 enters the cylinder 1 tangentially. The flushing water flushes along the inner wall of the cylinder 1, which is more effective. Both the flushing water pipe 10 and the feed pipe 9 are provided with shut-off valves.
[0019] After the COD test is completed, rinse the COD detector 2 with clean water, and then discharge the remaining sewage and rinsing water through the drain pipe 14.
[0020] A copper ring 19 is provided between the clamping sleeve 21 and the base plate 15, and a copper sleeve 20 is provided between the clamping sleeve 21 and the cup-shaped cover 16 to reduce friction.
[0021] A breather valve 6 is provided on the cover plate 5.
Claims
1. A COD water quality analyzer, comprising a cylinder (1), characterized in that: The cylinder (1) and the bottom plate (15) are welded together in a sealed manner. The upper part of the cylinder (1) is connected to the cover plate (5) by a flange and bolts. The cylinder (1), the bottom plate (15) and the cover plate (5) form a reaction vessel. A cup-shaped cover (16) is provided in the center of the bottom plate (15). The opening of the cup-shaped cover (16) faces downward. A geared motor (3) is provided on the bottom plate (15) below the cup-shaped cover (16). The geared motor (3) is connected to the bottom plate (15) by bolts. The output shaft (22) of the geared motor (3) extends into the inner hole of the cup-shaped cover (16). 22) An inner permanent magnet ring (18) is inlaid on the outside. The inner permanent magnet ring (18) is in clearance fit with the inner hole of the cup-shaped cover (16). A stirring shaft (7) is provided on the upper side of the cup-shaped cover (16). A clamping sleeve (21) is provided at the lower part of the stirring shaft (7). An outer permanent magnet ring (17) is inlaid in the inner hole of the clamping sleeve (21). The outer permanent magnet ring (17) is in clearance fit with the outer circle of the cup-shaped cover (16). A support (8) is connected to the upper part of the stirring shaft (7) through a bearing. The support (8) is connected to the cover plate (5) by bolts. A stirring paddle (4) is installed on the stirring shaft (7). The inner hole magnetic poles of the outer permanent magnet ring (17) are opposite to the outer circular magnetic poles of the inner permanent magnet ring (18), and the geared motor (3) is frequency-controlled. The bottom plate (15) is provided with a drain pipe (12), which is connected in parallel with a detection pipe (13) and a sewage pipe (14). The detection pipe (13) is provided with a regulating valve (11) and a COD detector (2). The sewage pipe (14) is provided with a shut-off valve. The cover plate (5) is provided with a feed pipe (9). The upper side of the cylinder (1) is provided with a flushing water pipe (10). The flushing water pipe (10) enters the cylinder (1) tangentially. Both the flushing water pipe (10) and the feed pipe (9) are provided with shut-off valves.
2. The COD water quality analyzer according to claim 1, characterized in that: A copper ring (19) is provided between the clamping sleeve (21) and the base plate (15), and a copper sleeve (20) is provided between the clamping sleeve (21) and the cup-shaped cover (16).
3. The COD water quality analyzer according to claim 1, characterized in that: A breather valve (6) is provided on the cover plate (5).