Liquid adding and stirring equipment and softening direct filtration system

Abstract

The present application relates to the technical field of wastewater treatment, and specifically discloses a liquid adding and stirring device and a softening direct filtration system. The liquid adding and stirring device includes a liquid adding ring tube, a shaft tube, a rotator, and a plurality of blade units. The rotator is connected to the shaft tube. The liquid adding ring tube is sleeved outside the shaft tube. When the rotator drives the shaft tube to rotate, the liquid adding ring tube remains in a seamless connection with the shaft tube. Each blade unit is connected to the shaft tube. Each blade unit includes a frame tube and a plurality of rotating tubes. One end of the frame tube is connected to the shaft tube, and the other end is connected to the shaft tube. The frame tube has a combination of a plurality of relative notches and grooves. The shaft tube leads to each notch. One end of each rotating tube is always connected to the notch, and the other end is inserted into the groove. The rotating tube has a plurality of liquid outlets. The rotating tube rotates with the turnover of the frame tube, which can efficiently disperse the liquid medicine in the wastewater, improve the efficiency of the hardness removal reaction, and the blade unit has low resistance when rotating in water, low energy consumption and long service life.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a liquid adding and stirring device and a softening and direct filtration system. Background Art

[0002] At present, the treatment of high-hardness and high-turbidity wastewater has become an important issue in environmental protection. The treatment steps usually include deflocculation, hardness removal, preliminary filtration, flocculation, high-efficiency sedimentation, flotation, deep filtration, disinfection, reverse osmosis and acid-base neutralization.

[0003] The hardness removal adopts the softening method of adding chemicals. According to the water quality, lime, soda ash, caustic soda and other chemicals are added to react with calcium ions and magnesium ions in the water to form insoluble compounds CaCO3 and Mg(OH)2, thereby reducing the water hardness. In order to improve the efficiency of the hardness removal reaction, it is necessary to disperse the added chemicals efficiently in the wastewater. At present, the fixed-point drop-adding method is generally adopted. The drop-adding process also uses a solid plate type stirring paddle to stir the water to disperse the chemicals. The hardness removal reaction tank is generally large. If the stirring paddle is designed to be larger, the stirring resistance will be large, the energy consumption will be high, and the service life of the stirring paddle will be short. Therefore, the stirring paddle is generally designed to be smaller. It takes a long time for the smaller solid plate type stirring paddle to evenly disperse the chemicals in the reaction tank, which reduces the efficiency of the hardness removal reaction. Summary of the Invention

[0004] Due to the problem that it takes a long time for the smaller solid plate agitator to evenly disperse the reagent in the reaction tank, which reduces the efficiency of the hardness removal reaction, this application proposes a liquid adding and stirring device that improves the efficiency of dispersing the reagent in water, and also proposes a softening direct filtration system including the liquid adding and stirring device. The specific plan is as follows.

[0005] In the first aspect, the present application proposes a liquid adding and stirring device, and adopts the following technical solution.

[0006] A liquid-adding stirring device comprises a liquid-adding ring tube, a shaft tube, a rotator, and a plurality of paddle units; the rotator is connected to the shaft tube; the liquid-adding ring tube is sleeved outside the shaft tube; when the rotator drives the shaft tube to rotate, the liquid-adding ring tube maintains a seamless connection with the shaft tube; each paddle unit is connected to the shaft tube. Each paddle unit comprises a frame tube and a plurality of rotating tubes; one end of the frame tube is connected to the shaft tube, and the other end is connected to the shaft tube; the frame tube has a combination of a plurality of opposing notches and grooves; the shaft tube leads to each notch; one end of each rotating tube is always connected to the notch, and the other end is inserted into the groove; the rotating tube has a plurality of liquid outlets.

[0007] By adopting the above technical solution, several rotating tubes installed on the frame tube serve as liquid outlets. They rotate as the frame tube rotates, which can efficiently disperse the liquid medicine in the wastewater and improve the efficiency of the hardness removal reaction. In addition, the blade unit has less resistance when rotating in water, low energy consumption and long service life.

[0008] In a preferred embodiment of the liquid-adding and stirring apparatus, the rotating tube comprises a central tube and three identical horizontal curved tubes. The inner ends of the three horizontal curved tubes are connected to the central tube; the concave surface of each horizontal curved tube faces the convex surface of the adjacent horizontal curved tube; the outer ends of the horizontal curved tubes serve as the liquid outlets. The upper end of the central tube is inserted into and communicates with the recess, while the lower end of the central tube is inserted into the groove; the lower end of the central tube is not connected to the shaft tube.

[0009] By adopting the above technical solution, the three horizontal arc tubes complement each other during rotation and jointly drive the rotating tube to rotate, thereby evenly dispersing the discharged liquid medicine in the water.

[0010] A preferred embodiment of the liquid-adding stirring device is that the paddle unit further includes a buoyancy valve; the buoyancy valve includes a counterweight, a float, a conduit, and a box. The frame tube includes an upper transverse tube, a vertical tube, and a lower transverse tube connected in sequence; the upper transverse tube is connected to the shaft tube, and the lower transverse tube is not connected to the shaft tube; the upper transverse tube is provided with the notch; and the lower transverse tube is provided with the groove. The box is fixed to the shaft tube; the upper end of the conduit is connected to the box, and the lower end is connected to the upper surface of the upper transverse tube; the float is installed in the box; the counterweight is installed in the frame tube and the conduit; the float is connected to the counterweight; the box has a plurality of water holes; when the box is not filled with water, the counterweight cuts off the frame tube; when the box is filled with water, the float floats to the top of the box, the counterweight releases the cutoff of the frame tube, and at least a portion of the counterweight is located in the conduit.

[0011] By adopting the above technical solution, when the buoyancy valve is submerged in water, the passage of the frame tube is opened, allowing the liquid medicine to be discharged from the liquid outlet. At this time, the frame tube is also submerged in water, simultaneously stirring and injecting the liquid medicine into the water. The buoyancy valve that is not submerged in water blocks the passage of the corresponding frame tube, preventing the frame tube that is submerged from spraying liquid medicine onto the frame tube, outside the reaction tank, or on the reaction tank wall, where it may dry up and block the liquid outlet, making it difficult to clean.

[0012] A preferred solution of the liquid adding and stirring device is that the lower surface of the frame tube has a downwardly protruding lower portion; when the box is not filled with water, the lower end of the counterweight block is embedded in the lower protrusion and the upper end is located in the conduit.

[0013] By adopting the above technical solution, the liquid medicine is not likely to seep through the lower surface of the counterweight block and enter the rotating tube.

[0014] A preferred solution of the liquid adding and stirring device is that the counterweight is square; the main cross section of the frame tube is square; the conduit is square; and the counterweight slides adaptively in the frame tube and the conduit.

[0015] By adopting the above technical solution, the counterweight block has a good effect of cutting off the frame tube, and the counterweight block can slide adaptively between the guide tube and the frame tube.

[0016] A preferred solution of the liquid adding and stirring device is that three blade units are provided in each circle on the circumference of the liquid adding and stirring device, adjacent blade units are spaced 120° apart, and the three blade units are arranged from high to low along a rotation direction.

[0017] By adopting the above technical solution, the liquid medicine is dispersed at multiple height positions in the water, thereby improving the dispersion uniformity and improving the efficiency of the hardness removal reaction when removing hardness from wastewater.

[0018] A preferred solution of the liquid adding and stirring equipment is that the liquid adding and stirring equipment includes an upper limit plate and a lower limit plate; the upper limit plate is fixed on the upper end of the shaft tube; the lower limit plate is fixed around the circumference of the shaft tube; the rotator is connected to the upper limit plate; the liquid adding ring tube is abutted between the upper limit plate and the lower limit plate; the inner ring surface of the liquid adding ring tube has an annular hole; the circumference of the shaft tube has a plurality of water holes; the annular hole is opposite to the plurality of water holes; an upper sealing ring and a lower sealing ring are arranged between the liquid adding ring tube and the shaft tube, respectively located on the upper and lower sides of the annular hole.

[0019] By adopting the above technical solution, the rotator can drive the shaft tube and the blade unit to rotate freely, and maintain sealed communication with the liquid adding ring tube during the rotation process, so that the medicine liquid can be continuously discharged from the liquid outlet for reaction during rotation.

[0020] A preferred solution of the liquid adding and stirring equipment is that the liquid adding and stirring equipment also includes a bracket and several liquid adding mechanisms; the rotator is fixed on the bracket; each of the liquid adding mechanisms includes a liquid medicine tank, a liquid adding pipe, a liquid adding pump and a one-way valve; the liquid medicine tank is fixed on the bracket; one end of the liquid adding pipe is connected to the liquid medicine tank, and the other end is connected to the liquid adding ring pipe; the liquid adding pump and the one-way valve are both installed on the liquid adding pipe.

[0021] By adopting the above technical solution, each liquid medicine tank can be loaded with a liquid medicine, and a liquid medicine can be injected into the blade unit in turn for reaction.

[0022] Secondly, this application also proposes a softening direct filtration system and adopts the following technical solution.

[0023] A softening direct filtration system includes the above-mentioned liquid adding and stirring equipment, and also includes a wastewater pipe, a pre-sedimentation regulating tank, a front pipe, a front pump, a reaction tank, a rear pipe, a pressure pump and a direct filtration equipment; the wastewater pipe leads to the pre-sedimentation regulating tank; the pre-sedimentation regulating tank leads to the reaction tank through the front pipe; the front pump is installed on the front pipe; the reaction tank leads to the direct filtration equipment through the rear pipe; the pressure pump is installed on the rear pipe; the shaft tube and multiple blade units of the liquid adding and stirring equipment extend into the reaction tank.

[0024] By adopting the above technical solution, the wastewater is first passed into the pre-sedimentation adjustment tank for static sedimentation, and then the upper clear liquid is input into the reaction tank for hardness removal reaction to generate precipitation. After the reaction, it is directly filtered through the direct filtration equipment and can be discharged from the system.

[0025] To sum up, the liquid-adding stirring equipment and softening direct filtration system of the present application have the following beneficial effects: the liquid-adding stirring equipment adopts a hollow frame tube as the stirring paddle main body, which has small rotation resistance in water and low energy consumption. A rotating tube is installed on the frame tube as the liquid outlet. During the rotation of the rotating tube, the medicinal liquid is discharged into the water. The medicinal liquid is fully stirred and dispersed, and the dispersion efficiency is high. The liquid-adding stirring equipment is applied to the hardness removal treatment of high-hardness wastewater, which can have a higher hardness removal reaction efficiency and improve the processing speed.

[0026] The softening direct filtration system is used to treat high-turbidity and high-hardness wastewater. The wastewater first passes through the pre-sedimentation adjustment tank for static sedimentation to precipitate most of the sediment, and then undergoes hardness removal treatment. After hardness removal, it is filtered using direct filtration equipment. The turbidity and calcium ions, magnesium ions, etc. in the wastewater are all processed and can be discharged from the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an implementation structure diagram of liquid adding and stirring equipment.

[0028] Figure 2 for Figure 1 A cross-sectional view of .

[0029] Figure 3 for Figure 2 A magnified view of area A.

[0030] Figure 4 for Figure 2 Magnified view of area B.

[0031] Figure 5 for Figure 2 Magnified view of area C.

[0032] Figure 6This is an implementation structure diagram of a softening direct filtration system.

[0033] Reference numerals: 1, bracket; 2, rotator; 3, upper limit plate; 4, shaft tube; 5, lower limit plate; 6, liquid adding ring tube; 7, blade unit; 8, liquid adding mechanism; 81, liquid tank; 82, liquid adding pipe; 83, liquid adding pump; 84, one-way valve; 601, annular hole; 401, water hole; 9, upper sealing ring; 10, lower sealing ring; 71, buoyancy valve; 72, frame tube; 73, rotating tube; 721, upper horizontal tube; 722, vertical tube; 723 , lower horizontal pipe; 7211, notch; 7231, groove; 731, middle pipe; 732, horizontal arc pipe; 7321, liquid outlet; 711, counterweight; 712, float; 713, conduit; 714, box; 7141, water hole; 7212, lower convex part; 11, wastewater pipe; 12, pre-sedimentation and adjustment tank; 13, front pipe; 14, front pump; 15, reaction tank; 16, rear pipe; 17, pressure pump; 18, direct filtration equipment. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the following embodiments, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application. Example 1

[0035] refer to Figure 1 A liquid adding and stirring device includes a bracket 1, a rotator 2, an upper limit plate 3, a shaft tube 4, a lower limit plate 5, a liquid adding ring tube 6, a plurality of blade units 7, and a plurality of liquid adding mechanisms 8.

[0036] Each liquid adding mechanism 8 includes a liquid medicine tank 81, a liquid adding pipe 82, a liquid adding pump 83 and a one-way valve 84. A solenoid valve or the like can also be installed on the liquid adding pipe 82 to automatically control the on-off of the pipeline. Each liquid medicine tank 81 can be loaded with a liquid medicine, such as lime, soda ash, caustic soda and other reagents, so that it reacts with calcium ions and magnesium ions in water to generate insoluble compounds CaCO3 and Mg(OH)2, thereby reducing the water hardness. One end of the liquid adding pipe 82 is connected to the conical bottom of the liquid medicine tank 81, and the other end is connected to the liquid adding ring pipe 6. The liquid adding pump 83 and the one-way valve 84 are both installed on the liquid adding pipe 82, for extracting the liquid medicine and preventing the liquid medicine from flowing back, respectively. The liquid medicine tank 81 is installed on the bracket 1.

[0037] like Figure 2, the rotator 2 can be a motor, the stator of which is fixed on the bracket 1, and the rotor, i.e. the rotating shaft, is fixed downwardly to the upper limit plate 3. The upper limit plate 3 is fixed downwardly to the top of the shaft tube 4. The lower limit plate 5 is fixed around the circumference of the shaft tube 4. The upper limit plate 3 and the lower limit plate 5 are parallel. The liquid adding ring tube 6 surrounds the outside of the shaft tube 4 and abuts between the upper limit plate 3 and the lower limit plate 5, so that the shaft tube 4 can rotate smoothly relative to the liquid adding ring tube 6, and during the rotation process, the shaft tube 4 and the liquid adding ring tube 6 always maintain a sealed connection, that is, the liquid medicine can be continuously introduced into the shaft tube 4 during rotation. As Figure 3 This can be achieved by defining an annular hole 601 on the inner annular surface of the liquid-adding ring tube 6, and defining a plurality of water holes 401 circumferentially corresponding to the position of the annular hole 601 on the shaft tube 4. An upper sealing ring 9 and a lower sealing ring 10 are also provided between the liquid-adding ring tube 6 and the shaft tube 4, located on the upper and lower sides of the annular hole 601, respectively. When the motor drives the shaft tube 4 to rotate, the liquid-adding ring tube 6 can remain stationary, and each annular hole 601 always rotates within the region of the annular hole 601, thereby maintaining a connected state. Furthermore, due to the sealing effect of the upper sealing ring 9 and the lower sealing ring 10, the liquid medicine flowing out of the annular hole 601 is not likely to seep out of the inner annular surface of the liquid-adding ring tube 6.

[0038] Multiple paddle units 7 are equidistantly arranged around the circumference of the shaft tube 4. Each paddle unit 7 is perpendicular to the shaft tube 4. When viewed along the axial direction of the shaft tube 4, the angle between adjacent paddle units 7 is 120°, and every three paddle units 7 form a circle. The three paddle units 7 in each circle can be of equal or unequal height. In this embodiment, unequal heights are preferred. For example, along a clockwise or counterclockwise rotation direction, the heights of the three paddle units 7 on the shaft tube 4 decrease from high to low. This arrangement improves the height coverage of all paddle units 7. During use, multiple height areas in the water can be covered, improving the dispersion efficiency of the liquid medicine in the water.

[0039] like Figure 1 Each slurry unit includes a buoyancy valve 71, a frame tube 72 and three rotating tubes 73. The frame tube 72 includes an upper transverse tube 721, a vertical tube 722 and a lower transverse tube 723 connected in sequence, all of which have square cross-sections. In other embodiments, they may all be circular. In this embodiment, the buoyancy valve 71 is connected to the upper transverse tube 721, the upper transverse tube 721 is connected to the shaft tube 4, and the lower transverse tube 723 is not connected to the shaft tube 4. In other embodiments that do not include the buoyancy valve 71, the lower transverse tube 723 may also be connected to the shaft tube 4. In some embodiments, the buoyancy valve 71 may also be connected to the lower transverse tube 723, and the upper transverse tube 721 may be set to be not connected to the shaft tube 4, while the lower transverse tube 723 is connected to the shaft tube 4.

[0040] like Figure 4In this embodiment, three notches 7211 are defined on the side of the upper transverse tube 721 facing the lower transverse tube 723. Specifically, the upper transverse tube 721 is recessed inwardly on the side facing the lower transverse tube 723 to form three recessed grooves. Each recessed groove is open in the middle of its bottom, but the bottom does not need to be fully open. The recesses 7211 allow for water flow. The lower transverse tube 723 also defines three grooves 7231 on the side facing the upper transverse tube 721. These grooves 7231 can be sealed to prevent water flow. When the shaft tube 4 is placed vertically, each notch 7211 directly faces a groove 7231 in the vertical direction.

[0041] like Figure 1 Each rotating tube 73 includes a middle tube 731 and three identical horizontal arc tubes 732. The middle tube 731 can be cylindrical. The cross-section of the horizontal arc tube 732 can be circular or square.

[0042] The inner end of each horizontal arc tube 732 is connected to the middle tube 731, and the outer end is the liquid outlet 7321. The three horizontal arc tubes 732 are equidistantly arranged on the circumferential side of the middle tube 731, and the three liquid outlets 7321 are located on the same circumference. The concave surface of each horizontal arc tube 732 faces the convex surface of the adjacent horizontal arc tube 732, so that the centrifugal directions of the outlets of the three horizontal arc tubes 732 complement each other, and when the liquid medicine is sprayed, they can jointly push the rotating tube 73 to rotate in one direction. The upper end of the middle tube 731 is inserted into the recess 7211 and is connected to the recess 7211. The lower end of the middle tube 731 is inserted into the groove 7231. The lower end of the middle tube 731 is not connected to the shaft tube 4. It can be that the lower end of the middle tube 731 is closed, or the groove 7231 is closed, or the connection between the lower transverse tube 723 and the shaft tube 4 is closed.

[0043] like Figure 5The buoyancy valve 71 includes a counterweight 711, a float 712, a conduit 713 and a box 714. The box 714 can be square and fixed to the side of the shaft tube 4. Each surface of the box 714 can be provided with a water injection hole 7141. The conduit 713 can be square, and the upper end of the conduit 713 is connected to the middle position of the lower surface of the box 714, and the lower end of the conduit 713 is connected to the upper surface of the upper transverse tube 721. The lower surface of the upper transverse tube 721 also has a downwardly protruding lower convex portion 7212. The lower convex portion 7212 is also square. The cross-sectional shape and size of the lower convex portion 7212 and the conduit 713 are the same. The counterweight 711 and the float 712 are both square, and the counterweight 711 and the float 712 are connected and fixed by a connecting rod. When the box 714 is not filled with water, the lower third of the counterweight 711 is located in the lower protrusion 7212, the middle third is located in the main body of the upper transverse tube 721, and the upper third is located in the conduit 713. There is still a space equivalent to two-thirds of the height of the counterweight 711 in the upper part of the conduit 713. The float 712 is located at the bottom of the box 714, and there is still a space equivalent to two-thirds of the height of the counterweight 711 in the upper part of the box 714. When the box 714 is filled with water, the float 712 drives the counterweight 711 to float upward. The float 712 floats up until it abuts the top surface of the box 714. At this time, the counterweight 711 just breaks away from the upper transverse tube 721 and is completely located in the conduit 713. To facilitate the floating of the float 712, a water injection hole 7141 can be provided at the upper two-thirds of the height of the conduit 713.

[0044] The liquid adding and stirring equipment can be used for the hardness removal treatment of high-hardness wastewater. When in use: the shaft tube 4 and the blade unit 7 of the liquid adding and stirring equipment are inserted into the wastewater, the rotator 2 drives the shaft tube 4 to rotate, and the blade unit 7 rotates with the shaft tube 4; the liquid adding pump 83 draws the liquid medicine in the liquid tank 81 into the liquid adding ring tube 6, and enters the shaft tube 4 through the annular hole 601 through the water hole 401; for the blade unit 7 immersed in the wastewater by the buoyancy valve 71, the buoyancy valve 71 opens the channel between the shaft tube 4 and the upper transverse tube 721, and the liquid medicine entering the shaft tube 4 is passed into the upper transverse tube 72 1, then enters the rotating tube 73, and is sprayed out from the three liquid outlets 7321 of the rotating tube 73, and the liquid medicine is evenly dispersed in the wastewater; for the paddle unit 7 that is not immersed in the wastewater by the buoyancy valve 71, the buoyancy valve 71 closes the channel between the shaft tube 4 and the upper transverse tube 721, so that the liquid medicine cannot enter this paddle unit 7, that is, the paddle unit 7 on the water surface does not spray the liquid medicine, and the liquid medicine does not dry out and block the liquid outlet 7321. The liquid medicine will not be sprayed out of the reaction tank 15 loaded with wastewater or sprayed on the inner wall of the reaction tank 15 and solidify, thereby reducing the waste of liquid medicine and the trouble of cleaning. The liquid medicine sprayed from the liquid outlet 7321 is first efficiently dispersed in the wastewater at this position by the rotation of the rotating tube 73. At the same time, due to the revolution of the paddle unit 7, it is dispersed in the wastewater at each circumferential height. Multiple paddle units 7 are arranged at different heights to cover multiple heights of the reaction tank 15, so that the liquid medicine is efficiently dispersed in the wastewater, improving the efficiency of the hardness removal reaction. Example 2

[0045] like Figure 6 A softening direct filtration system includes the liquid adding and stirring device of embodiment one, and also includes a wastewater pipe 11, a pre-sedimentation adjustment tank 12, a front pipeline 13, a front pump 14, a reaction tank 15, a rear pipeline 16, a pressure pump 17 and a direct filtration device 18.

[0046] The support 1 of the liquid adding and stirring device is arranged on the peripheral side and above the reaction tank 15 , and the shaft tube 4 and the blade unit 7 extend into the reaction tank 15 .

[0047] The wastewater pipe 11 injects external wastewater into the pre-sedimentation regulating tank 12. After standing, most of the sediment settles down. The front pipe 13 is connected to the pre-sedimentation regulating tank 12 and the reaction tank 15. The front pump 14 installed on the front pipe 13 extracts the upper layer of wastewater into the reaction tank 15. After the extraction is completed, the rotator 2 is started to stir the wastewater. The liquid addition pump 83 extracts the liquid medicine in the liquid tank 81 into the liquid addition ring pipe 6, and then enters the shaft pipe 4. As described in Example 1, the liquid medicine is sprayed into the wastewater from the liquid outlet 7321, and fully reacts with the calcium ions and magnesium ions in the wastewater to form calcium carbonate and magnesium hydroxide precipitates. The rear pipe 16 connects the reaction tank 15 and the direct filtration equipment 18. After the reaction is completed, the pressure pump 17 installed on the rear pipe 16 is started, and the wastewater with flocculent or particulate matter after hardness removal is passed through the direct filtration equipment 18 for efficient filtration, completing the hardness removal and turbidity removal of high-hardness and high-turbidity wastewater.

[0048] The direct filtration device 18 utilizes a direct filtration softening membrane, made of PTFE and fused through a special process. The membrane has a pore size of 0.01 to 5 μm. Pressure filtration at 0.2 to 0.3 MPa traps sediment and suspended matter in the water, reducing turbidity. The filtered water can be discharged directly or fed into a subsequent advanced treatment system, depending on environmental requirements.

[0049] The above embodiment adopts the innovative process of "drug softening + direct filtration softening membrane" for the simultaneous hardness and turbidity removal treatment of sewage, which simplifies the traditional multiple treatment stages into one stage to meet the discharge requirements. The filtration flux is 30~50LMH, which can intercept precipitation and suspended matter in the water and reduce the turbidity in the water. After treatment, the hardness of the effluent can be reduced to 0.15~0.2mmol, of which the Ca2+ and Mg2+ ion contents are less than 50mg / L, and the turbidity can be reduced to ≤0.5NTU.

[0050] Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A liquid adding and stirring device, characterized in that: The invention comprises a liquid adding ring tube (6), a shaft tube (4), a rotator (2), and a plurality of blade units (7); the rotator (2) is connected to the shaft tube (4); the liquid adding ring tube (6) is sleeved outside the shaft tube (4); when the rotator (2) drives the shaft tube (4) to rotate, the liquid adding ring tube (6) maintains a seamless connection with the shaft tube (4); each of the blade units (7) is connected to the shaft tube (4); Each of the blade units (7) comprises a frame tube (72) and a plurality of rotating tubes (73); one end of the frame tube (72) is connected to the shaft tube (4), and the other end is connected to the shaft tube (4); the frame tube (72) has a combination of a plurality of relative notches (7211) and grooves (7231); the shaft tube (4) leads to each of the notches (7211); one end of each of the rotating tubes (73) is always connected to the notch (7211), and the other end is inserted into the groove (7231); the rotating tube (73) has a plurality of liquid outlets (7321); The rotating tube (73) includes a middle tube (731) and three identical horizontal arc tubes (732); The inner ends of the three horizontal arc tubes (732) are connected to the middle tube (731); the concave surface of each horizontal arc tube (732) faces the convex surface of the adjacent horizontal arc tube (732); the outer end of the horizontal arc tube (732) is the liquid outlet (7321); The upper end of the intermediate tube (731) is inserted into the recess (7211) and communicates with the recess (7211), and the lower end of the intermediate tube (731) is inserted into the groove (7231); the lower end of the intermediate tube (731) is not communicated with the shaft tube (4); The paddle unit (7) further comprises a buoyancy valve (71); the buoyancy valve (71) comprises a counterweight (711), a float (712), a conduit (713) and a box (714); The frame tube (72) includes an upper transverse tube (721), a vertical tube (722), and a lower transverse tube (723) connected in sequence; the upper transverse tube (721) is connected to the shaft tube (4), and the lower transverse tube (723) is not connected to the shaft tube (4); the upper transverse tube (721) is provided with the notch (7211); and the lower transverse tube (723) is provided with the groove (7231); The box (714) is fixed to the shaft tube (4); the upper end of the guide tube (713) is connected to the box (714), and the lower end is connected to the upper surface of the upper transverse tube (721); the float (712) is installed in the box (714); the counterweight (711) is installed in the frame tube (72) and the guide tube (713); the float (712) is connected to the counterweight (711); the box (714) has a plurality of water holes (7141); when the box (714) is not filled with water, the counterweight (711) cuts off the frame tube (72); when the box (714) is filled with water, the float (712) floats to the top of the box (714), the counterweight (711) releases the cutoff of the frame tube (72), and at least a part of the counterweight (711) is located in the guide tube (713).

2. The liquid adding and stirring device according to claim 1, characterized in that: The lower surface of the frame tube (72) has a downwardly protruding lower portion (7212); when the box (714) is not filled with water, the lower end of the counterweight (711) is embedded in the lower protrusion (7212), and the upper end is located in the conduit (713).

3. The liquid adding and stirring device according to claim 2, characterized in that: The counterweight (711) is square; the main cross-section of the frame tube (72) is square; the conduit (713) is square; and the counterweight (711) slides adaptively in the frame tube (72) and the conduit (713).

4. The liquid adding and stirring device according to claim 1, characterized in that: On the circumference of the liquid adding and stirring device, three blade units (7) are arranged in each circle, adjacent blade units (7) are spaced 120 degrees apart, and the three blade units (7) are arranged from high to low along a rotation direction.

5. The liquid adding and stirring device according to claim 1, characterized in that: The liquid adding and stirring device comprises an upper limit plate (3) and a lower limit plate (5); the upper limit plate (3) is fixed to the upper end of the shaft tube (4); the lower limit plate (5) is fixed around the circumference of the shaft tube (4); the rotator (2) is connected to the upper limit plate (3); the liquid adding ring tube (6) is abutted between the upper limit plate (3) and the lower limit plate (5); the inner annular surface of the liquid adding ring tube (6) has an annular hole (601); the circumference of the shaft tube (4) has a plurality of water holes (401); the annular hole (601) is opposite to the plurality of water holes (401); an upper sealing ring (9) and a lower sealing ring (10) are provided between the liquid adding ring tube (6) and the shaft tube (4), and are respectively located on the upper and lower sides of the annular hole (601).

6. The liquid adding and stirring device according to claim 5, characterized in that: The liquid adding and stirring device further comprises a bracket (1) and a plurality of liquid adding mechanisms (8); the rotator (2) is fixed on the bracket (1); each of the liquid adding mechanisms (8) comprises a liquid medicine tank (81), a liquid adding pipe (82), a liquid adding pump (83) and a one-way valve (84); the liquid medicine tank (81) is fixed on the bracket (1); one end of the liquid adding pipe (82) is connected to the liquid medicine tank (81), and the other end is connected to the liquid adding ring pipe (6); the liquid adding pump (83) and the one-way valve (84) are both installed on the liquid adding pipe (82).

7. A softening direct filtration system, characterized in that: The liquid adding and stirring device comprises the liquid adding and stirring device according to any one of claims 1 to 6, and further comprises a wastewater pipe (11), a pre-sedimentation regulating tank (12), a front pipe (13), a front pump (14), a reaction tank (15), a rear pipe (16), a pressure pump (17) and a direct filtration device (18); the wastewater pipe (11) leads to the pre-sedimentation regulating tank (12); the pre-sedimentation regulating tank (12) leads to the reaction tank (15) through the front pipe (13); the front pump (14) is installed on the front pipe (13); the reaction tank (15) leads to the direct filtration device (18) through the rear pipe (16); the pressure pump (17) is installed on the rear pipe (16); the shaft pipe (4) and the plurality of blade units (7) of the liquid adding and stirring device extend into the reaction tank (15).

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