1 Hose pump structure and working principle Hose pump is a pump housing, rotor body, reducer, machine base and hose 5 most of the components, shown in Figure 1. Hose pump work, the rotor body rotation, the rotor body of a pair of pressure roller along a special hose rotation, the pressure roller and the pressure generated by the casing will be flattened hose, tube flexibility in itself and the side guide roller , The liquid is sucked into the vacuum by recovering the original shape, and the liquid is discharged from the tube by the mechanical squeeze of the press roll, so as to reciprocate. The pump structure is simple, easy to make. Pump durability depends mainly on the flexibility and corrosion resistance of the pipe, the flow and the motor speed and the size of the tube diameter, so the key is to choose the tube and speed control mechanism, as long as the tube has a long enough life, speed stability, long-term There is no problem with maintaining a constant delivery. 2 hose pump main features (1) is a positive displacement pump, with or without mechanical seal, self-priming ability, self-cleaning and other characteristics. (2) No pump valve, stuffing box, will not produce the leakage of sealing pump and air resistance phenomenon. (3) simple structure, strong adaptability, liquid, gas, slurry and viscous suspended material can be transported, especially the smooth hose cavity can pump impurities liquid, a variety of fiber objects and containing the particle size of Hose diameter 1/4 below the solid slurry, and does not produce any blockage. (4) without running the pump before running, dry run, there will be no spindle seals and other failures, the pump suction liquid only contact with the hose, it can transport rubber can withstand corrosive and abrasive media, you can replace the general Stainless steel pump. (5) can be positive and negative rotation, without setting the import and export, less power consumption, high hydraulic and volumetric efficiency. (6) Has good metering capacity, can be used as a metering pump, the flow can be changed by selecting the size of the pipe and adjust the speed, wide range of flow (3 ~ 9 m3 / h), measurement accuracy, high repeatability (7) Many materials (vinyl plastic, nylon, rubber and silicone rubber, etc.), suitable for conveying a variety of corrosive, toxic, sterile, radioactive and other media. Tube diameter 0. 5 ~ 75 mm, the maximum working pressure up. .98 MPa, the working temperature is -62 ~ +260 '℃ Extruded contact life of the tube is generally 200 ~ 700 h. When you can not continue to use, you can change the extrusion of the pipe or replace the new tube. (8) 1 pump head can hold 1 to 20 tubes or 1 pump Install multiple sets of pump head work, while conveying one or more media. 1 pump multi-purpose, 1 pump instead of several pumps (suction, row can be at the same time), small working volume, high efficiency 3 hose pump tube selection Hose pump is the key component of the pipe, which is the only pump through Flow part. Only the hose to meet the technical requirements, the pump can work properly, it should be based on the purpose of use and the nature of the media to choose. Common tube grades are: Tygon (R 3603, ordinary type): inexpensive, corrosion-resistant, generally used in laboratories, can be used for good vacuum pump system; Tygon (special type): transport of hydrocarbon medium, the most Suitable for gasoline, fuel oil and lubricants; Viton: can deliver special corrosive chemicals and reagents, but expensive, short service life; Silicone: meet the UADA (rubber formula test solvent) standards and the FDA (rubber formula test solvent) , Wide operating temperature range, small temperature-dependent hardening, affordable, long service life, when the pump head speed of 200 r / min, working 450 h, there is still some flexibility. The choice of pipe, the main consideration of the following factors: corrosion resistance, operating conditions (pressure, temperature, flow, etc.), with or without toxicity and price. These conditions affect each other, so we should make a comprehensive trade-off before we can make economic choices. Due to the long service life of Silicone, the working time of continuous operation up to 1200 h with pump head speed of 50 r / min is good, with good elasticity, high chemical stability, non-toxic, low price, adequate supply, So currently widely used. 4 hose pump application and effect Originally used to transport pulp is 4 sets of diaphragm pumps, the transmission distance of 30 m, fall Qiao m (2 parallel use, and the other two relay delivery). Now after the process of transformation, the selection of a hose diameter of 65 mm hose pump instead of the original diaphragm pump, before and after the transformation process shown in Figure 2, Figure 3. Before and after the transformation of the use of hose pumps and diaphragm pump in Table 1. Table 1 shows that a one-time investment in small hose pump, long service and maintenance cycle, less maintenance costs, operating costs decline.
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