Lightweight small flow dosing single screw pump

Abstract

This utility model relates to the field of wastewater treatment technology, specifically to a lightweight, low-flow single-screw pump for chemical dosing. It includes a pump body housing a rotor and a stator. The pump body comprises a drive section and a transmission connection section. The drive section includes a servo energy-saving integrated motor and a reducer. The transmission connection section includes a connecting shaft and an intermediate shaft, with the intermediate shaft connected to the rotor via a universal joint assembly. In terms of structural design, this utility model reduces the weight of the direct-connection frame and simplifies its design. The design of the suction chamber and discharge body not only makes them lighter but also utilizes a sanitary clamp structure. Compared to traditional flange connections, this updated structural design, along with modifications to the drive system, significantly improves the economy and reliability of the wastewater treatment system. The planetary gear reducer motor possesses the high efficiency, stable and reliable operation, and high transmission accuracy of ordinary gear drives.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a lightweight, low-flow single screw pump for chemical dosing. Background Technology

[0002] With the rapid development of wastewater treatment technology, the performance optimization and structural innovation of dosing pumps, as key equipment for chemical dosing, have become an important research direction for improving wastewater treatment efficiency. Wastewater treatment is a core link in environmental protection and water resource recycling, and the precise control of chemical dosing (such as flocculants, disinfectants, pH adjusters, etc.) directly affects the treatment effect.

[0003] Traditional dosing pumps generally have the following problems:

[0004] Complex mechanical structure: Traditional pump bodies are made of cast iron, which is heavy and has high installation and transportation costs;

[0005] Low energy efficiency ratio: Redundant design of the power system leads to increased energy consumption;

[0006] Difficult to maintain: Insufficient sealing and corrosion resistance, prone to leakage or wear.

[0007] Therefore, a lightweight, low-flow single-screw pump for dosing is proposed to solve the problems mentioned above. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention provides a lightweight, low-flow single-screw pump for dosing, which can solve the problems described in the background section.

[0009] To achieve the above objectives, this utility model provides the following technical solution: It includes a pump body, wherein a rotor and a stator are disposed within the pump body.

[0010] The pump body consists of a drive section and a transmission connection section;

[0011] The drive unit includes a servo energy-saving integrated motor and a reducer;

[0012] The transmission connection includes a connecting shaft and an intermediate shaft, and the intermediate shaft is connected to the rotor through a universal joint assembly.

[0013] Preferably, the reducer is disposed on the side of the servo energy-saving integrated motor, and the servo energy-saving integrated motor is connected to the output shaft inside the reducer, and the output shaft of the reducer is connected to the connecting shaft.

[0014] Preferably, a suction chamber is provided on one side of the reducer, and a connecting chamber is provided between the suction chamber and the reducer, and the connecting shaft is inserted into the interior of the connecting chamber.

[0015] Preferably, the connecting shaft is connected to the intermediate shaft via the universal joint assembly, and the connecting shaft, the intermediate shaft, and the two universal joint assemblies are all located inside the intake chamber, with one end of the rotor connected to the universal joint assembly inserted into the intake chamber.

[0016] Preferably, a water-retaining ring is fitted on the outer side of the connecting shaft, the water-retaining ring is located inside the connecting chamber, and a mechanical seal is connected to the insertion part of the connecting shaft and the suction chamber.

[0017] Preferably, the suction chamber is provided with a fixed housing on the side away from the reducer, and the rotor and the stator are both disposed inside the fixed housing.

[0018] Preferably, a discharge body is provided at one end of the fixed housing, a support leg is provided at the lower end of the fixed housing, a support base is connected to the lower end of the support leg, and the reducer is provided at the upper end of the other side of the support base.

[0019] Compared with the prior art, this utility model provides a lightweight, low-flow single screw pump for dosing, which has the following advantages:

[0020] 1. In terms of structural design, the weight of the direct connection frame is reduced and made simpler. The design of the inhalation chamber and the exhaust body is not only made lighter, but also uses a sanitary clamp structure. Compared with the traditional flange connection, the clamp system reduces the cost of accessories and labor by more than 50%.

[0021] 2. The interfaces between the intake chamber and the exhaust body adopt quick-connect type, which can be replaced with flange and other types, which is flexible, lightweight, and lightweight design. The universal joint assembly adopts the pin type, which has a simple structure, fewer components, and lightweight design. The mechanical seal components adopt a thin design to reduce and save installation space.

[0022] 3. It adopts a planetary gear reducer motor, which has the characteristics of high efficiency, stable and reliable operation, and high transmission accuracy of ordinary gear transmission.

[0023] 4. Improved equipment drive system: The flow and pressure sensors, variable frequency motors, frequency converters, and control cabinets of traditional single screw pump dosing systems are integrated into an intelligent permanent magnet speed-regulating geared motor, which meets the requirements of the digital age and can be controlled remotely or locally. The lightweight, small-flow single screw pump dosing system needs to be more integrated. In addition to meeting the volumetric delivery characteristics of a single screw pump, the drive control system should be lightweight, integrated, and intelligent to meet the personalized needs of metering and dosing in various industries.

[0024] 5. The selection of pump materials, the updated structural design, and the modification of the drive system have significantly improved the economy and reliability of the sewage treatment system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall side sectional structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall front view of the present invention;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the direct-connection frame of this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the inhalation chamber of this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the discharge body of this utility model.

[0030] In the diagram: 1. Servo energy-saving integrated motor; 2. Reducer; 3. Water baffle ring; 4. Mechanical seal component; 5. Connecting shaft; 7. Intermediate shaft; 8. Universal joint assembly; 9. Inlet chamber; 10. Rotor; 11. Stator; 12. Support leg; 13. Discharge body. Detailed Implementation

[0031] 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.

[0032] Example:

[0033] Please see Figure 1 - Figure 4 The lightweight, low-flow-rate single-screw pump in this embodiment includes a pump body, within which a rotor 10 and a stator 11 are disposed.

[0034] The pump body consists of a drive unit and a transmission connection unit;

[0035] The drive unit includes a servo energy-saving integrated motor 1 and a reducer 2;

[0036] The transmission connection includes a connecting shaft 5 and an intermediate shaft 7, with the intermediate shaft 7 connected to the rotor 10 via a universal joint assembly 8;

[0037] The reducer 2 is located on the side of the servo energy-saving integrated motor 1, and the servo energy-saving integrated motor 1 is connected to the output shaft inside the reducer 2. The output shaft of the reducer 2 is connected to the connecting shaft 5.

[0038] A suction chamber 9 is provided on one side of the reducer 2, and a connecting chamber is provided between the suction chamber 9 and the reducer 2. The connecting shaft 5 is inserted into the interior of the connecting chamber.

[0039] The connecting shaft 5 is connected to the intermediate shaft 7 through the universal joint assembly 8, and the connecting shaft 5, the intermediate shaft 7 and the two universal joint assemblies 8 are all located inside the intake chamber 9. The rotor 10 is connected to the universal joint assembly 8 at one end, which is inserted into the intake chamber 9.

[0040] A water-blocking ring 3 is fitted on the outer side of the connecting shaft 5. The water-blocking ring 3 is located inside the connecting chamber. A mechanical seal component 4 is connected to the insertion part of the connecting shaft 5 and the suction chamber 9.

[0041] A fixed housing is provided on the side of the suction chamber 9 away from the reducer 2, and the rotor 10 and stator 11 are both located inside the fixed housing;

[0042] A discharge body 13 is provided at one end of the fixed housing, a support leg 12 is provided at the lower end of the fixed housing, a support base is connected to the lower end of the support leg 12, and the reducer 2 is provided at the upper end of the other side of the support base.

[0043] The pump body design uses two models of stator and rotor 10, namely XG021B06LJ and XG031B06LJ. The stator 11, rotor 10, intermediate shaft 7, and drive shaft are borrowed parts from conventional products. Therefore, the parts that need to be designed for the pump body are the suction chamber 9, discharge body 13, tie rod, direct connection frame, etc.

[0044] The lightweight design of the direct connection frame needs to take into account the original direct connection frame structure. The original direct connection frame uses a cast iron structure, which is heavy and complex to process. Because the direct connection frame uses common special-shaped tubing as the base material, the overall structure is simple and easy to process. It abandons the complex process of mold casting required for the transmission direct connection frame, and also ensures that the appearance of the direct connection frame is more concise.

[0045] The lightweight design of the suction chamber 9, achieved by using 304 stainless steel, reduces the overall weight. However, traditional suction chamber 9 stator 11 requires a tie rod, necessitating a flange design. The lightweight design eliminates this traditional approach, removing the flange for fixing the tie rod and fixing it to a direct connection frame. This further reduces the weight of the suction chamber 9 and reduces three machining steps, improving processing efficiency. The inlet design of the suction chamber 9 also abandons the flange structure, opting instead for a sanitary clamp structure. Customers using clamp connections can fasten pipes and equipment without welding or thread tightening, requiring only simple tools, significantly shortening construction time (typically increasing installation efficiency by 30%~50%). Disassembly does not damage the pipe structure, facilitating cleaning, disinfection, or replacement of valves and other components, reducing maintenance cycles by more than 40%. Compared to traditional flange connections, the clamp system reduces parts and labor costs by more than 50%.

[0046] The interface between the intake chamber 9 and the exhaust body 13 adopts a quick-connect type, which can be replaced with flanges and other types, making it flexible, lightweight, and compact. The universal joint assembly 8 adopts a pin type, which is simple in structure, has fewer components, and is compact. The mechanical seal component 4 adopts a thin design, reducing and saving installation space.

[0047] The elimination of the intermediate wiring between the traditional motor and frequency converter saves costs and reduces the failure rate. It eliminates the need for an electrical cabinet and meets protection requirements of up to 65%. It has excellent electromagnetic compatibility, greatly reducing equipment interference. It requires no debugging and comes with OTA function for easy after-sales parameter adjustment. Customizable products are available, and adjustment buttons can be added or removed by installing them on the machine casing. It is very convenient to use. It has a speed control panel and can be connected to the control cabinet via a communication line for speed adjustment. It is small in size and can be miniaturized due to its high efficiency. The permanent magnet motor can maintain an efficiency of over 85% across the entire speed range, with particularly noticeable efficiency at low speeds. The motor rotor 10 uses permanent magnets with its own magnetic field, eliminating the need for excitation current during operation. It adopts a surface-mounted permanent magnet rotor 10 with a simple magnetic circuit structure, uniform air gap between the stator and rotor 10, no magnetic reluctance torque, low cost, large starting torque, strong overload capacity, and precise speed control, resulting in high metering accuracy for the single screw pump.

[0048] The lightweight design of the discharge body 13 is similar to that of the pump outlet interface and the suction chamber 9. A sanitary clamp structure is selected, and the outlet special pipe design ensures that the medium flows without dead corners and residues at the pump outlet. In addition, a flange with a fixed tie rod at one end is added to achieve the lightweight design of the discharge body 13.

[0049] The medium enters the pump chamber through the suction port. The reducer shaft 2 and the connecting shaft 5 are connected by pins. The connecting shaft 5 and the rotor 10 are connected by the intermediate shaft 7 and two sets of universal joint assemblies 8. The metal rotor 10 rotates eccentrically in the cavity of the rubber stator 11. After the medium enters the sealed cavity formed by the isolated stator 11 and rotor 10, it is pressurized and discharged. The small-sized, multi-functional servo energy-saving integrated motor 1 and the reducer 2 are connected to realize the driving part of the conveying.

[0050] Resistance to common chemical media: 304 stainless steel (containing 18% chromium and 8% nickel) has good corrosion resistance to common agents such as dilute sulfuric acid, organic acids, and weak alkalis, and can resist the erosion of media such as PAC, PAM, and disinfectants commonly used in water treatment.

[0051] Balanced cost-effectiveness: Compared to 316 stainless steel, 304 is cheaper and performs similarly in non-high chloride ion or extreme acid environments, making it suitable for most routine chemical dosing scenarios.

[0052] Smooth surface and easy to clean: 304 stainless steel can achieve a mirror finish of Ra0.8μm through polishing, reducing the risk of drug residues and bacterial growth, and meeting the hygiene requirements of the food, pharmaceutical and other industries;

[0053] Material certification guarantee: 304 is a food-grade steel (compliant with ASTM standards), and will not cause secondary pollution when in contact with water for a long time, making it suitable for drinking water or precision dosing scenarios;

[0054] High strength and durability: The austenitic crystal structure gives it excellent tensile strength and ductility. The pump body can withstand frequent start-stop and medium pressure conditions, and its service life is significantly longer than that of plastic materials such as PVC and PP.

[0055] Low maintenance costs: Wear-resistant properties reduce component wear caused by media particle erosion, reducing the frequency of downtime for maintenance;

[0056] Therefore, the outer shell material uses high-strength 304 seamless steel pipe as the pump body material, which reduces the weight by 40%~50% while ensuring corrosion resistance and pressure resistance. The servo energy-saving integrated motor 1 and reducer 2 drive shaft are made of 2Cr13, which improves the corrosion resistance of the material while ensuring shaft strength. The rotor 10 is made of 304 electroplated material, which not only ensures the corrosion resistance of the rotor 10, but also improves the wear resistance of the rotor 10 and increases the service life of the rotor 10.

[0057] Since the above-described devices and connections are known to those skilled in the art, they have not been described in detail in the specification and drawings.

[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight, low flow dosing single screw pump characterized by: It includes a pump body, which is equipped with a rotor (10) and a stator (11). The pump body consists of a drive section and a transmission connection section; The drive unit includes a servo energy-saving integrated motor (1) and a reducer (2); The transmission connection includes a connecting shaft (5) and an intermediate shaft (7), and the intermediate shaft (7) is connected to the rotor (10) through a universal joint assembly (8).

2. The lightweight low-flow chemical injection single screw pump of claim 1, wherein: The reducer (2) is located on the side of the servo energy-saving integrated motor (1), and the servo energy-saving integrated motor (1) is connected to the output shaft inside the reducer (2). The output shaft of the reducer (2) is connected to the connecting shaft (5).

3. The lightweight low-flow chemical injection single screw pump of claim 1, wherein: A suction chamber (9) is provided on one side of the reducer (2), and a connecting chamber is provided between the suction chamber (9) and the reducer (2). The connecting shaft (5) is inserted into the interior of the connecting chamber.

4. The lightweight low-flow chemical injection single screw pump of claim 1, wherein: The connecting shaft (5) is connected to the intermediate shaft (7) through the universal joint assembly (8), and the connecting shaft (5), the intermediate shaft (7) and the two universal joint assemblies (8) are all located inside the suction chamber (9). The rotor (10) is connected to the universal joint assembly (8) at one end, which is inserted into the suction chamber (9).

5. The lightweight low-flow chemical injection single screw pump of claim 1, wherein: A water-blocking ring (3) is fitted on the outside of the connecting shaft (5). The water-blocking ring (3) is located inside the connecting chamber. A mechanical seal component (4) is connected to the insertion part of the connecting shaft (5) and the suction chamber (9).

6. The lightweight low-flow chemical injection single screw pump of claim 3, wherein: The suction chamber (9) is provided with a fixed housing on the side away from the reducer (2), and the rotor (10) and the stator (11) are both located inside the fixed housing.

7. The lightweight low-flow chemical injection single-screw pump of claim 6, wherein: A discharge body (13) is provided at one end of the fixed housing, and a support leg (12) is provided at the lower end of the fixed housing. A support base is connected to the lower end of the support leg (12), and the reducer (2) is located at the upper end of the other side of the support base.

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