Anti-corrosion Abrasion Resistance Centrifugal Pump

  Fluoroplastic self-priming pumps, also known as the TIZF series fluoroplastic self-priming pumps, are designed and manufactured in accordance with international standards and the manufacturing processes for non-metallic pumps. The pump structure adopts a self-priming design. The pump casing consists of a metal shell lined with fluoroplastic, and all wetted parts are made of fluoroplastic alloy. Components like the pump cover and impeller are manufactured by integrally sintering and pressing metal inserts coated with fluoroplastic. The shaft seal utilizes an advanced external bellows mechanical seal. The stationary ring is made of 99.9% alumina ceramic (or silicon nitride), and the rotating ring is made of PTFE-filled material, ensuring highly stable corrosion resistance, wear resistance, and sealing performance.   A fluoroplastic self-priming pump does not require priming before startup (although the initial installation still requires priming). After a short period of operation, the pump can draw fluid up and commence normal operation through its own action.   Fluoroplastic self-priming pumps can be classified by their operating principle into the following categories: 1.Gas-liquid mixing type (including internal mixing and external mixing). 2.Water ring type. 3.Jet type (including liquid jet and gas jet).     Working process of the gas-liquid mixing self-priming pump: Due to the special structure of the pump casing, a certain amount of water remains in the pump after it stops. When the pump is started again, the rotation of the impeller fully mixes the air in the suction line with the water. This mixture is discharged into the gas-water separation chamber. The gas in the upper part of the separation chamber escapes, while the water in the lower part returns to the impeller to mix again with the remaining air in the suction line. This process continues until all gas in the pump and suction line is expelled, completing the self-priming process and allowing normal pumping.   Water ring self-priming pumps​ integrate a water ring and the pump impeller within a single housing, using the water ring to expel gas and achieve self-priming. Once the pump operates normally, the passage between the water ring and the impeller can be closed off via a valve, and the liquid within the water ring can be drained.   Jet self-priming pumps: consist of a centrifugal pump combined with a jet pump (or ejector). They rely on the ejector device to create a vacuum at the nozzle to achieve suction.   The self-priming height of a fluoroplastic self-priming pump is related to factors such as the front impeller seal clearance, pump speed, and liquid level height in the separation chamber. A smaller front impeller seal clearance results in a greater self-priming height, typically set between 0.3-0.5 mm. If the clearance increases, besides a decrease in self-priming height, the pump's head and efficiency also reduce. The self-priming height increases with the rise in the impeller's peripheral velocity (u2). However, once the maximum self-priming height is reached, further speed increases will not raise the height but only shorten the priming time. If the speed decreases, the self-priming height also decreases. Under other constant conditions, the self-priming height increases with a higher stored water level (but should not exceed the optimal water level for the separation chamber).   To better facilitate gas-liquid mixing within the self-priming pump, the impeller should have fewer blades, increasing the pitch of the blade grid. It is also advisable to use a semi-open impeller (or an impeller with wider flow channels), as this allows the returning water to penetrate more deeply into the impeller blade grid. Most fluoroplastic self-priming pumps are matched with internal combustion engines and mounted on movable carts, making them suitable for field operations.   What is the working principle of a fluoroplastic self-priming pump? For a standard centrifugal pump, if the suction liquid level is below the impeller, it must be primed with water before startup, which is inconvenient. To retain water in the pump, a foot valve is required at the inlet of the suction pipe, but this valve causes significant hydraulic losses during operation. A self-priming pump, as described above, does not require priming before startup (except for the initial installation). After a short operation, it can draw fluid up and begin normal operation. The classification and working principles of the different self-priming types (gas-liquid mixing, water ring, jet) are as previously detailed.

Comprehensive Guide to Chemical Centrifugal Pumps: From Features to Installation   1.Overview of Chemical Centrifugal Pumps Chemical centrifugal pumps, as reliable assistants in the chemical industry, have gained widespread popularity due to their outstanding performance characteristics, such as wear resistance, uniform water output, stable operation, low noise, easy adjustment, and high efficiency. Their working principle involves the generation of centrifugal force when the impeller rotates while the pump is filled with water. This force pushes the water in the impeller channels outward into the pump casing. Subsequently, the pressure at the center of the impeller gradually decreases until it falls below the pressure in the inlet pipe. Under this pressure differential, water from the suction pool continuously flows into the impeller, enabling the pump to sustain water suction and supply. With the growing demand for chemical centrifugal pumps across various industries, it is essential to delve into their technical details. Next, Anhui Shengshi Datang will explore 20 technical questions and answers about chemical centrifugal pumps with you, unveiling the technical mysteries behind them.   2.Performance Characteristics of Chemical Centrifugal Pumps Chemical centrifugal pumps are highly favored for their wear resistance, uniform water output, and other features. They possess multiple characteristics, including adaptability to chemical process requirements, corrosion resistance, tolerance to high and low temperatures, resistance to wear and erosion, reliable operation, minimal or no leakage, and the ability to transport liquids in critical states.   3.Technical Details of Chemical Centrifugal Pumps a. Definition and Classification Chemical centrifugal pumps are devices that generate centrifugal force through impeller rotation and can be classified into vane pumps, positive displacement pumps, etc. Based on their working principles and structures, chemical pumps are categorized into vane pumps, positive displacement pumps, and other forms. Vane pumps utilize the centrifugal force generated by impeller rotation to enhance the mechanical energy of liquids, while positive displacement pumps transport liquids by altering the working chamber volume. Additionally, there are special types like electromagnetic pumps, which use electromagnetic effects to transport conductive liquids, as well as jet pumps and airlift pumps that utilize fluid energy to convey liquids.   b. Advantages and Performance Parameters Centrifugal pumps offer high flow rates, simple maintenance, and core metrics such as output power and efficiency. Centrifugal pumps exhibit several notable advantages in application. First, their single-unit output provides a large and continuous flow without pulsation, ensuring smooth operation. Second, their compact size, lightweight design, and small footprint reduce costs for investors. Third, the simple structure, minimal vulnerable parts, and long maintenance intervals minimize operational and repair efforts. Furthermore, centrifugal pumps feature excellent adjustability and reliable operation. Notably, they require no internal lubrication, ensuring the purity of the transported fluid without contamination from lubricants.    c. Types of Losses and Efficiency Main hydraulic losses include vortex, resistance, and impact losses, with efficiency being the ratio of effective power to shaft power. Hydraulic losses in centrifugal pumps, also known as flow losses, refer to the difference between theoretical head and actual head. These losses occur due to friction and impact during liquid flow within the pump, converting part of the energy into heat or other forms of energy loss. Hydraulic losses in centrifugal pumps primarily consist of three components: vortex loss, resistance loss, and impact loss. These combined effects create the difference between theoretical and actual head. The efficiency of a centrifugal pump, also called mechanical efficiency, is the ratio of effective power to shaft power, reflecting the extent of energy loss during operation.   d. Speed and Power Speed affects flow rate and head, with power measured in watts or kilowatts. The speed of a centrifugal pump refers to the number of rotations the pump rotor completes per unit time, measured in revolutions per minute (r/min). The power of a centrifugal pump, or the energy transmitted to the pump shaft by the prime mover per unit time, is also known as shaft power, typically measured in watts (W) or kilowatts (KW).   e. Head and Flow Rate When speed changes, flow rate and head vary according to square or cubic relationships. Adjusting the speed of a centrifugal pump alters its head, flow rate, and shaft power. For unchanged media, the ratio of flow rate to speed exceeds the speed itself, while the ratio of head to speed equals the square of the speed ratio. Meanwhile, the ratio of shaft power to speed equals the cube of the speed ratio.   f. Number of Blades and Materials The number of blades typically ranges from 6 to 8, with materials requiring corrosion resistance and high strength. The number of blades in a centrifugal pump impeller is a critical parameter directly affecting pump performance. Generally, the blade count is set based on specific applications and needs, ensuring efficient and stable operation. Common manufacturing materials include gray cast iron, acid-resistant silicon iron, alkali-resistant aluminum cast iron, chromium stainless steel, etc.   g. Pump Casing and Structure The pump casing collects liquid and increases pressure, with common structures including horizontal split-type designs. The pump casing plays a vital role in centrifugal pumps. It not only collects liquid but also gradually reduces liquid velocity through specific channel designs. This process effectively converts part of the kinetic energy into static pressure, enhancing liquid pressure while minimizing energy loss due to oversized channels. Common pump casing structures include horizontal split-type, vertical split-type, inclined split-type, and barrel-type designs.   With the continuous updates in process technology for chemical enterprises, stricter demands are placed on the stable operation of chemical centrifugal pumps. These pumps play a crucial role in the chemical industry, where their performance stability directly impacts the smoothness of the entire production process. Therefore, a deep understanding and rational selection of pump casing support forms are essential for ensuring the stable operation of chemical centrifugal pumps.