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Characteristics of water treatment pumps and technology trends
I. Introduction Water pumps are important equipment for transporting fluid in water treatment and supply energy to the fluid to overcome the resistance in flow and keep the flow in the equipment or pipeline. In addition, the water treatment, but also need to be from a chemical tank to B tank sent from low to high. All of this is done by the pump doing work. Thus, a reasonable choice of pump products, water pump technology to understand the development trend of a water treatment work has become an important task. In this paper, the structural features of pumps for water treatment, applications, made a brief introduction, for reference to the relevant staff. Second, the classification of water treatment pumps Within the field of water treatment industry, the application of a wide range of pump equipment, it is difficult to use a classification method for macro-general, often according to actual needs by different methods for classification, the following for a brief introduction. 1. According to the working principle of classification Vane pump: the use of blade and liquid interaction to transport liquid, such as centrifugal pump, mixed flow pump, axial flow pump, vortex pump. Volumetric pumps: the use of cyclical changes in the volume of the studio to transport liquids, such as piston pumps, piston pumps, diaphragm pumps, gear pumps, skateboard pumps and screw pumps. Other types of pumps: Pumps that change fluid potential only, such as water tankers, etc. Pumps that use liquid energy to deliver liquids such as jet pumps, water hammer pumps, sour eggs, etc. 2. According to the transmission medium classification Single-phase medium pump, two-phase medium pump, multi-phase medium pump three categories. 3. Blade water treatment pump classification In the water treatment pump, blade water treatment pump is the most widely used, commonly used in the following types: single-stage pump, multi-stage pump, double suction pump, mixed flow pump, Axial flow pumps, submersible pumps, submersible sewage pumps, screw pumps, metering pumps, piston pumps, screw pumps and jet pumps. Third, the main product introduction 1. Centrifugal anti-corrosion pump Centrifugal anti-corrosion pump is mainly single-stage single-suction cantilever corrosion-resistant pump for conveying solid particles, corrosive fluids, the use of temperature at 0 ~ 100 ~ In the water treatment for ion exchange H-water transport process. Transmission medium contact flow components used stainless steel, plastic two materials. The difference between the two is the pump body, pump cover and trays of different ways of coupling. The former is the pump body is fixed to the tractor, and then the pump cover is fixed on the pump body; the latter is the pump body is fixed to the tractor by the stop of the pump cover, and the pump cover is fixed at the same time. 2. Sewage Pump Sewage pump mainly by the pump, pump cover, bearing box, impeller, shaft and other parts. It is mainly used to transport fluids with fiber or other suspended matter under 80 ~ C, as well as acidic, alkaline or other corrosive sewage. There are two types of sewage pumps commonly used: one is a common motor sewage pump, and the other is submersible sewage pump. 3. In the pump to open the pump in the water treatment process for the transport of water-based fluids used, the maximum temperature does not exceed 80 ~ C. Commonly used pumps have S-type centrifugal pump ~ flSh-type centrifugal pump. S-type centrifugal pump higher efficiency, low-cost products, which will help save energy. Sh-type centrifugal pump running reliability, long life. In the pump, as the name suggests, the pump body is open, divided into two parts. The combination of seam and axis center in the same plane, the middle of the paper pad separated. Upper and lower body to pin positioning, bolt fastening. Inlet and outlet are in the lower body, into a horizontal direction, perpendicular to the pump shaft. Upper and lower body closed after the composition of two symmetrical suction chamber on both sides of the impeller, two shared a suction inlet, the middle of the high pressure chamber, the bottom of the discharge pipe connected to I: 1. Centrifugal pump impeller operation, due to the low-pressure side of the pump body (inlet) and the high-pressure side (outlet), will lead to unbalanced force on both sides of the impeller. In order to avoid this problem, a number of balancing holes are opened in the middle of the right side of the impeller, so that the high pressure water on the right side flows back into the low pressure area in a small amount so as to balance the axial thrust. 4. Reciprocating Pump Reciprocating Pump Relying on the reciprocating piston (or plunger) in the pump cylinder to change the volume of the pump cylinder, with the role of two check valves to achieve the purpose of inhalation or discharge of liquid. Reciprocating pump piston according to the structure, can be divided into piston reciprocating pump, reciprocating piston pump and diaphragm reciprocating pump three. Piston reciprocating pump is the main component of the piston, rely on the piston in the pump cylinder to inhale or discharge liquid. Plunger reciprocating pump is the main component of the plunger (columnar body), than the piston contact area, wear-resistant. Its mode of action and the piston exactly the same. The main part of the diaphragm reciprocating pump is also a plunger. Unlike the plunger reciprocating pump, a rubber (or steel) diaphragm separates the working chamber and the cylinder of the pump. When the plunger reciprocates, Membrane then move back and forth, play a role in inhalation or discharge of liquid. 5. Metering pump screw pump In the water treatment process, metering pumps and screw pumps more applications. (1) metering pump metering pump plunger and diaphragm are two types, mainly by the worm, eccentric, bow frame, crosshead, plunger, eccentric shaft, adjusting screw and motor and other components. The dosing pump is a reciprocating pump that can dynamically or statically adjust the flow: it regulates the flow by adjusting the distance between the screw and the eccentric shaft. The smaller the distance between the screw and the eccentric shaft, the larger the stroke of the pump, the greater the flow rate of the pump. On the contrary, the flow of the pump is also smaller. J-type metering pump is widely used in metering requirements accurate, adjustable dosage, continuous distribution of media occasions. In water treatment processes, it is used to deliver and add corrosive and non-corrosive agents that are free of solid particles. Depending on the chemical nature of the conveying medium, the overcurrent portion of the cylinder may be made of a corresponding corrosion-resistant material. (2) Screw Pump Screw pump with a single screw pump, twin screw pump and three screw pump. Can be used to deliver a single or