Automatic quantitative PAC dosing device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a PAC automatic quantitative dosing device which comprises a medicine storage unit, a metering unit and a driving unit. A conical medicine outlet and a throttling ring are arranged at the bottom of the medicine storage unit, a floating piston and an elastic reset piece are arranged in the metering unit, and the driving unit achieves reciprocating motion of the floating piston through a transmission gear set. According to the device, the dependence on a complex control system is reduced through the structural optimization design, the flow is adjusted through the throttling ring, accurate metering is achieved through the floating piston, and accurate control over the agent adding amount is achieved. The sewage treatment device is compact in overall structure, simple to operate, stable and leakproof, suitable for various sewage treatment scenes, economical and practical.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment and automation control technology, specifically a PAC automatic quantitative dosing device. Background Technology

[0002] In the field of wastewater treatment, chemical dosing devices are one of the key pieces of equipment for achieving water quality treatment. A search revealed a published intelligent control system and method for chemical dosing in a magnetic coagulation sedimentation system, with publication number CN114940533B and publication date March 31, 2023. This design uses online monitoring equipment to monitor the influent and effluent water quality of the magnetic coagulation sedimentation system in real time, and calculates the number and frequency of pneumatic diaphragm pump activation based on configuration programs, dosing control logic algorithms, and physicochemical parameters, thereby adjusting the chemical dosing. This design enables intelligent and precise control; however, in practical applications, it relies on complex algorithms and hardware configurations, which may lead to high system costs. For small-scale wastewater treatment scenarios, its functional configuration is quite complex and difficult to meet the requirements of low cost and high efficiency.

[0003] In existing technologies, chemical dosing devices typically require dynamic adjustments to the dosage based on changes in water quality. However, complex algorithms and hardware configurations can increase the difficulty of equipment maintenance and place higher demands on the technical skills of operators. Furthermore, in small-scale wastewater treatment scenarios, limitations in space and budget may restrict the application of existing technologies, making it difficult to balance economic efficiency and practicality. Therefore, there is an urgent need to design a PAC automatic quantitative dosing device that is simple in structure, easy to operate, and suitable for various scenarios to address these issues. Utility Model Content

[0004] To address the technical challenges mentioned in the background section regarding existing chemical dosing devices that rely on complex algorithms and hardware configurations, resulting in high costs and difficulty in meeting the low-cost, high-efficiency requirements of small-scale wastewater treatment scenarios, this paper provides a PAC (Automatic Quantitative Dosing) device. This device, through optimized structural design, reduces reliance on complex control systems while achieving precise control of chemical dosage, making it suitable for various wastewater treatment scenarios.

[0005] To achieve the above objectives, the specific technical solution of the PAC automatic quantitative dosing device of this utility model is as follows:

[0006] An automatic quantitative dosing device for PAC includes a drug storage unit, a metering unit, and a drive unit. The drug storage unit and the metering unit are connected by a flexible connecting pipe, and the metering unit and the drive unit are fixedly connected by a rigid bracket.

[0007] The drug storage unit has a conical drug outlet at its bottom, with an adjustable flow rate throttling ring embedded inside. The outer wall of the throttling ring has an elastic soft rubber pad that mates with the inner wall of the conical drug outlet. Two sets of fixing rings are located at the bottom of the inner wall of the drug storage unit. These fixing rings have openings to facilitate drug passage. A bevel gear set is positioned between the two sets of fixing rings. A knob is located on the outer wall of the drug storage unit via a rotating rod. The other end of the rotating rod, fixed to the knob, has a first bevel gear that meshes with a second bevel gear. A rotating shaft is fixed to the bottom of the second bevel gear, and the bottom of the rotating shaft has threads. The upper end of the rotating shaft rotates within the two sets of fixing rings, while the lower end is threaded into the throttling ring.

[0008] The metering unit includes a metering chamber and a floating piston. The floating piston slides axially through a groove in the metering chamber. An elastic reset member is located on top of the floating piston, with one end abutting the top of the floating piston and the other end abutting the inner wall of the top of the metering chamber. The drive unit includes a rotary handle and a transmission gear set. One end of the elastic reset member abuts the top of the floating piston via a flat pressure plate, and the other end abuts the inner wall of the top of the metering chamber via the flat pressure plate.

[0009] The drive unit includes a rotary handle and a transmission gear set. The rotary handle is linked to the floating piston through the transmission gear set. The transmission gear set includes a driving gear and a driven gear. The driving gear is fixed on the output shaft of the rotary handle, and the driven gear is connected to the lead screw of the floating piston through a keyway.

[0010] Furthermore, the drug storage unit includes a cylindrical drug storage cylinder and a top cover. The top cover is connected to the cylindrical drug storage cylinder via a flange, which is equipped with a sealing gasket made of corrosion-resistant rubber. The cylindrical drug storage cylinder has a transparent observation window on its side wall, which is made of plexiglass and is used to monitor the drug level inside the storage unit in real time.

[0011] Furthermore, a filter layer is provided at the bottom of the conical drug outlet. The filter layer is made of multiple layers of stainless steel wire mesh and is fixed to the inner wall of the conical drug outlet by clips to prevent particulate matter in the drug from clogging the throttling ring.

[0012] Furthermore, the metering chamber has a cylindrical structure with a polished inner wall to reduce frictional resistance during the sliding of the floating piston. Two sealing rings made of polytetrafluoroethylene (PTFE) are installed on the outer wall of the floating piston, ensuring a tight seal between the sealing rings and the inner wall of the metering chamber, preventing leakage of the medication from the gap between the floating piston and the metering chamber.

[0013] Furthermore, the elastic reset component is a helical spring, with flat pressure plates at both ends of the helical spring to distribute pressure evenly.

[0014] Furthermore, the rigid support consists of two parallel metal rods, with the two ends of the metal rods fixed to the metering unit and the drive unit respectively by bolts. The metal rods are made of stainless steel to ensure the stability of the rigid support.

[0015] Furthermore, the flexible connecting pipe is a corrosion-resistant hose made of polyurethane. Both ends of the flexible connecting pipe are fixed to the conical outlet of the drug storage unit and the inlet of the metering unit by clamps, respectively. The clamps are made of galvanized steel.

[0016] Furthermore, the outer surface of the rotary handle is provided with anti-slip texture to facilitate the operator in applying torque.

[0017] The PAC automatic quantitative dosing device of this invention has the following advantages:

[0018] By incorporating a conical outlet and a throttling ring at the bottom of the storage unit, combined with a floating piston and elastic reset component in the metering unit, precise control of the dosage is achieved. The conical outlet design ensures smoother drug flow, while the threaded fit of the throttling ring facilitates flow rate adjustment. The tight fit between the floating piston and the metering chamber ensures consistent dosage each time, avoiding errors caused by equipment wear. The drive unit converts the motion of the rotary handle into the reciprocating motion of the floating piston via a transmission gear set, simplifying operation and eliminating the need for a complex control system. The combination of a rigid support and flexible connecting pipe ensures the overall stability and sealing of the device while reducing maintenance difficulty. The compact overall structure is suitable for various wastewater treatment scenarios, balancing economy and practicality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a PAC automatic quantitative dosing device according to the present invention;

[0020] Figure 2 This is a half-sectional view of the drug storage unit of a PAC automatic quantitative dosing device according to the present invention;

[0021] Figure 3 This is an internal view of the bevel gear housing and conical dispensing port of an automatic quantitative dosing device for PAC according to this utility model;

[0022] Figure 4 This is a half-sectional view of the metering unit of an automatic quantitative dosing device for PAC according to this utility model;

[0023] In the picture:

[0024] 1. Drug storage unit; 2. Metering unit; 3. Drive unit; 4. Flexible connecting tube; 5. Rigid support; 6. Conical drug outlet; 7. Throttling ring; 71. Fixing ring; 72. Knob; 73. Bevel gear one; 74. Bevel gear two; 75. Rotating shaft; 8. Filter layer; 9. Transparent observation window; 10. Metering chamber; 11. Floating piston; 12. Elastic reset element; 13. Sealing ring; 14. Rotating handle; 15. Transmission gear set; 151. Driving gear; 152. Driven gear; 153. Lead screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The PAC automatic quantitative dosing device of this utility model includes a drug storage unit 1, a metering unit 2, and a drive unit 3. The drug storage unit 1 and the metering unit 2 are connected by a flexible connecting pipe 4, which is a corrosion-resistant flexible hose made of polyurethane. Both ends of the flexible connecting pipe 4 are fixed to the conical outlet 6 of the drug storage unit 1 and the inlet of the metering unit 2, respectively, by clamps made of galvanized steel. The metering unit 2 and the drive unit 3 are fixedly connected by a rigid bracket 5, which consists of two parallel metal rods made of stainless steel. Both ends of the metal rods are fixed to the outer shells of the metering unit 2 and the drive unit 3 by bolts. Example

[0029] It should be noted that the drug storage unit 1 includes a cylindrical drug storage cylinder and a top cover. The top cover is connected to the cylindrical drug storage cylinder via a flange, and a sealing gasket made of corrosion-resistant rubber is provided on the flange. A transparent observation window 9, made of plexiglass, is provided on the side wall of the cylindrical drug storage cylinder for real-time monitoring of the drug level within the drug storage unit 1. A conical drug outlet 6 is provided at the bottom of the drug storage unit 1. A throttling ring 7 is provided inside the conical drug outlet 6, and an elastic soft rubber gasket is provided on the outer wall of the throttling ring 7, which fits into the inner wall of the conical drug outlet 6. The inner wall of the drug storage unit 1 has two sets of fixing rings 71 at the bottom. The fixing rings 71 have openings to facilitate the passage of the drug. A bevel gear set is set between the two sets of fixing rings 71. The outer wall of the drug storage unit 1 has a knob 72 on a rotating rod. The other end of the rotating rod fixed by the knob 72 has a bevel gear 73. The bevel gear 73 meshes with a bevel gear 74. A rotating shaft 75 is fixed at the bottom of the bevel gear 74. The bottom of the rotating shaft 75 has a thread. The upper end of the rotating shaft 75 rotates within the two sets of fixing rings 71, and the lower end is threaded into a throttling ring 7. The bottom of the conical drug outlet 6 has a filter layer 8. The filter layer 8 is made of multiple layers of stainless steel wire mesh. The filter layer 8 is fixed to the inner wall of the conical drug outlet 6 by a buckle to prevent particles in the drug from clogging the throttling ring 7. When the medicine in the storage unit 1 flows into the metering unit 2 and the flow rate needs to be adjusted, the user rotates the knob 72. The first bevel gear 73 meshes with the second bevel gear 74 and rotates. The second bevel gear 74 drives the rotating shaft 75 to rotate. The bottom thread of the rotating shaft 75 meshes with the center of the throttling ring 7 and moves the throttling ring 7 upward. The medicine can then flow through the gap opened on the inner wall of the conical medicine outlet 6 on the outer circumference of the throttling ring 7. After being filtered by the filter layer 8, the medicine enters the flexible connecting tube 4 and finally flows into the metering unit 2. Example

[0030] In this embodiment, the metering unit 2 includes a metering chamber 10 and a floating piston 11. The floating piston 11 is located inside the metering chamber 10 and slides axially along a groove opened in the metering chamber 10. An elastic reset member 12 is provided on the top of the floating piston 11. One end of the elastic reset member 12 abuts against the top of the floating piston 11 via a flat pressure plate, and the other end abuts against the inner wall of the top of the metering chamber 10 via a flat pressure plate. The metering chamber 10 has a cylindrical structure, and its inner wall is polished to reduce the frictional resistance when the floating piston 11 slides. Two sealing rings 13 are provided on the outer wall of the floating piston 11. The sealing rings 13 are made of polytetrafluoroethylene (PTFE) and fit tightly against the inner wall of the metering chamber 10 to ensure that the medicine does not leak from the gap between the floating piston 11 and the metering chamber 10. The elastic reset member 12 is a helical spring, with flat pressure plates at both ends for evenly distributing pressure. Example

[0031] Furthermore, the drive unit 3 includes a rotary handle 14 and a transmission gear set 15. The rotary handle 14 is linked to the floating piston 11 via the transmission gear set 15 to achieve the reciprocating motion of the floating piston 11 within the metering chamber 10. The transmission gear set 15 includes a driving gear 151 and a driven gear 152. The driving gear 151 is fixed on the output shaft of the rotary handle 14, and the driven gear 152 is connected to the lead screw 153 of the floating piston 11 via a keyway. The lead screw 153 rotates on the inner wall of the metering unit 2, and its bottom is threadedly connected to the center of the floating piston 11. The outer surface of the rotary handle 14 is provided with anti-slip textures to facilitate the operator in applying torque. When the medicine enters the metering unit 2 and needs to be discharged, the user rotates the rotary handle 14. The output shaft of the rotary handle 14 drives the drive gear 151 to rotate. The drive gear 151 meshes with the driven gear 152 for transmission. The driven gear 152 drives the lead screw 153 to rotate. The lead screw 153 rotates inside the metering unit 2 and is threadedly connected to the floating piston 11, which moves downward. The floating piston 11 squeezes the medicine downward through the groove opened on the inner wall of the metering unit 2, and finally discharges it from the medicine outlet.

[0032] The operation process of this utility model is as follows: First, the dosage of medicine in the medicine storage unit 1 is checked through the transparent observation window 9, and the position of the throttling ring 7 is adjusted according to the needs to control the flow rate of the medicine. The medicine flows from the medicine storage unit 1 into the metering chamber 10 of the metering unit 2 through the flexible connecting pipe 4. At this time, the floating piston 11 moves upward under the action of the medicine pressure, and the elastic reset member 12 is compressed. When medicine needs to be added, the operator manually rotates the rotating handle 14. The rotating handle 14 drives the transmission gear set 15 to rotate, thereby pushing the floating piston 11 downward and discharging the medicine in the metering chamber 10 through the medicine outlet. After the floating piston 11 moves downward, the elastic reset member 12 provides a reverse force, so that the floating piston 11 returns to the initial position, completing one working cycle.

[0033] This device is suitable for small-scale wastewater treatment scenarios, such as decentralized wastewater treatment plants in rural areas or industrial wastewater pretreatment stages. In practical applications, the opening of the throttling ring 7 can be adjusted according to water quality conditions to change the reagent flow rate, and the reagent dosage can be precisely controlled by rotating the handle 14. The design of the rigid support 5 and the flexible connecting pipe 4 ensures the overall stability and sealing of the device, while reducing maintenance difficulty. The transparent observation window 9 allows operators to monitor the reagent dosage and amount in real time, improving work efficiency.

[0034] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further explained below in conjunction with a specific application scenario.

[0035] In rural decentralized sewage treatment plants, this PAC automatic quantitative dosing device is used to treat suspended solids and organic pollutants in domestic sewage. Operators first check the dosage of the chemical in the cylindrical storage tank through the transparent observation window 9 of the storage unit 1 to ensure sufficient dosage for the day's treatment needs. If the dosage is insufficient, chemical is added to the storage tank through the top cover. The flange connection between the top cover and the storage tank, along with the sealing gasket design, effectively prevents chemical leakage and ensures the airtightness of the storage unit 1.

[0036] Subsequently, the operator adjusts the position of the throttling ring 7 inside the conical outlet 6 based on the current water quality monitoring data. By rotating the knob 72, bevel gear 1 73 meshes with bevel gear 2 74, which in turn drives the rotating shaft 75 to rotate. The bottom thread of the rotating shaft 75 engages with the center of the throttling ring 7, causing the throttling ring 7 to move upward, changing its fit with the inner wall of the conical outlet 6, thereby controlling the flow rate of the chemical. During this process, the filter layer 8 at the bottom of the conical outlet 6 plays a crucial role. Its multi-layered stainless steel wire mesh structure can intercept particulate matter in the chemical, preventing particulate matter accumulation that could clog the throttling ring 7. This design not only improves the stability of the chemical flow but also reduces maintenance frequency and lowers operating costs.

[0037] When the drug flows from the storage unit 1 into the metering unit 2 through the flexible connecting pipe 4, the drug pressure pushes the floating piston 11 to move axially upward along the metering chamber 10, while simultaneously compressing the elastic reset member 12. Because the inner wall of the metering chamber 10 is polished, the frictional resistance between the floating piston 11 and the metering chamber 10 is significantly reduced, ensuring the smooth movement of the floating piston 11. Furthermore, two polytetrafluoroethylene (PTFE) sealing rings 13 on the outer wall of the floating piston 11 fit tightly against the inner wall of the metering chamber 10, preventing drug leakage from gaps and thus ensuring the accuracy of each dosage.

[0038] When medication needs to be added, the operator manually rotates the rotary handle 14 of the drive unit 3. The rotary handle 14 converts the rotational motion into the linear reciprocating motion of the floating piston 11 via the transmission gear set 15. During this process, the floating piston 11 moves downward, discharging the medication in the metering chamber 10 through the outlet. The elastic reset member 12 provides a counterforce after the floating piston 11 moves downward, restoring it to its initial position, completing one work cycle.

[0039] The rigid support 5 consists of two parallel stainless steel rods, each bolted to the housing of the metering unit 2 and the drive unit 3 respectively. This design not only enhances the overall stability of the device but also prevents structural loosening due to vibration or external impact. The flexible connecting pipe 4 is made of corrosion-resistant polyurethane and secured at both ends with galvanized steel clamps to ensure a tight seal between the drug storage unit 1 and the metering unit 2. This combined design enables the device to operate stably for extended periods in complex environments while facilitating disassembly and maintenance.

[0040] In practical applications, operators periodically observe changes in the liquid level within the transparent observation window 9, replenishing the reagents promptly and adjusting the opening of the throttling ring 7 according to changes in water quality. For example, when the concentration of suspended solids in the influent is high, the opening of the throttling ring 7 can be appropriately increased to improve the reagent flow rate; while when the water quality is relatively clear, the opening of the throttling ring 7 can be decreased to conserve reagent usage. In this way, the device can flexibly adapt to different water quality conditions, achieving economical and efficient operation.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PAC automatic dosing device, characterized in that, It includes a drug storage unit (1), a metering unit (2) and a driving unit (3). The drug storage unit (1) and the metering unit (2) are connected by a flexible connecting pipe (4), and the metering unit (2) and the driving unit (3) are fixedly connected by a rigid bracket (5). The metering unit (2) includes a metering chamber (10) and a floating piston (11). The floating piston (11) is located inside the metering chamber (10) and slides axially through a groove opened in the metering chamber (10). The top of the floating piston (11) is provided with an elastic reset member (12). One end of the elastic reset member (12) abuts against the top of the floating piston (11) through a flat pressure plate, and the other end abuts against the inner wall of the top of the metering chamber (10) through a flat pressure plate.

2. The PAC automatic dosing device according to claim 1, characterized in that, The bottom of the drug storage unit (1) is provided with a conical drug outlet (6), and the inside of the conical drug outlet (6) is provided with a throttling ring (7). The outer wall of the throttling ring (7) is provided with an elastic soft rubber pad and cooperates with the inner wall of the conical drug outlet (6). The bottom of the inner wall of the drug storage unit (1) is provided with two sets of fixing rings (71). The fixing rings (71) have openings to facilitate the passage of the drug. A bevel gear set is provided between the two sets of fixing rings (71). The outer wall of the drug storage unit (1) is provided with a knob (72) through a rotating rod. The other end of the rotating rod fixed by the knob (72) is provided with a bevel gear one (73). The bevel gear one (73) meshes with the bevel gear two (74). The bottom of the bevel gear two (74) is fixed with a rotating shaft (75). The bottom of the rotating shaft (75) is provided with a thread. The upper end of the rotating shaft (75) rotates in the two sets of fixing rings (71), and the lower end is threaded and meshes with the throttling ring (7).

3. The PAC automatic dosing device according to claim 1, characterized in that, The drive unit (3) includes a rotary handle (14) and a transmission gear set (15). The rotary handle (14) is linked with the floating piston (11) through the transmission gear set (15). The transmission gear set (15) includes a drive gear (151) and a driven gear (152). The drive gear (151) is fixed on the output shaft of the rotary handle (14). The driven gear (152) is connected to the lead screw (153) of the floating piston (11) through a keyway. The lead screw (153) rotates on the inner wall of the metering unit (2), and its bottom is connected to the center of the floating piston (11) by a thread.

4. The PAC automatic dosing device according to claim 1, characterized in that, The drug storage unit (1) includes a cylindrical drug storage cylinder and a top cover. The top cover is connected to the cylindrical drug storage cylinder by a flange. A sealing gasket is provided on the flange. A transparent observation window (9) is provided on the side wall of the cylindrical drug storage cylinder.

5. The PAC automatic dosing device according to claim 2, characterized in that, The bottom of the conical medicine outlet (6) is provided with a filter layer (8), which is fixed to the inner wall of the conical medicine outlet (6) by a snap fastener.

6. The PAC automatic dosing device according to claim 3, characterized in that, The metering chamber (10) has a cylindrical structure, and the outer wall of the floating piston (11) is provided with two sealing rings (13).

7. The PAC automatic quantitative dosing device according to claim 1, characterized in that, The rigid support (5) consists of two parallel metal rods, with the two ends of the metal rods fixed to the metering unit (2) and the driving unit (3) respectively by bolts.

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