I. Hose pump working principle and application
Hose in the pump body was U-shaped arrangement, when the rotating body drives the extrusion wheel back and forth, the extruding hose receives the extrusion wheel's extrusion elastic deformation, and then the inlet forms the negative pressure to inhale the slurry, through the extrusion wheel's pushing, the slurry is discharged from the outlet, forming the pressure transmission of the slurry.
Industrial hose pump is mainly used in construction, underground engineering, mining, food, paper making, ceramics and other fields of viscous slurry long-distance transportation, metering pumping, pressure grouting, spraying and so on.
2、Hose pump hose design
Hoses for industrial hose pumps are specifically designed to be re-compressed and should not be confused with "ordinary hose". Some hoses consist of a homogeneous extruded material, while others have an inner layer of reinforcing fibres to increase the rigidity of the hose and ensure that the circular cross-section is maintained when uncompressed.
Squeeze pump hoses need to be replaced as soon as the squeeze resilience of the squeeze tube reaches an unacceptable level, realizing that the hose remains slightly oval in shape even when uncompressed. In the case of lined hose designs, this "hose fatigue" may eventually lead to rupture or delamination of the inner liner. It is best to replace the hose in a timely manner before it completely fails to prevent process fluid from leaking into and possibly out of the pump.
Squeeze wheel and slide shoe structural design
For hose pump internals, there are usually two design options, a squeeze pulley and a sliding shoe. The squeeze wheel design is gentler on the hose squeeze because the squeeze wheel rolls over the hose surface as the hose is compressed. The sliding shoe design not only compresses the hose, but also creates sliding friction on the hose surface, which is more abrasive on the extruded tube, so it is common to use a sliding shoe design that requires a sufficient amount of lubricant inside the pump casing to help extend hose life. The design of the sliding shoe and the addition of lubricant to the pump body adds a degree of complexity and cost to the sliding shoe peristaltic pump.
Squeeze Wheel Design
Slipper structural design
The decision as to which design is most appropriate depends on the pressure required by the pump and the specific application, as the sliding shoe design is capable of withstanding higher pressures than the squeeze wheel construction of the hose pump.
The squeeze wheel design only requires the application of silicone grease to the hose surface and does not require additional lubrication as the rollers "roll" over the hose surface. Therefore, applications involving food and beverage may consider this design, because once the hose failure breakage, the possibility of cross-contamination is less than soaked in lubricant slipper shoe design peristaltic pump - even if the oil is "food grade", it is still generally preferable to use the roller design.
Fourth, the hose pump features advantages
1. The squeeze tube is the only part in contact with the pumped material and is the only wearing part.
2. Operation without seals and without directional valves.
3. Have a high self-priming capacity, with a self-priming height of up to 5 m.
4. Can be idle without damaging the hose pump.
5. can be reversed forward and backward, and in the event of a blockage, the reverse button can be pressed to easily resolve the blockage.
6. Can pump granular, viscous materials.
7. can be cleaned online, easy to maintain.
V. Properly adjust the size of the peristaltic pump
The hose size (usually referred to as ID), swing diameter (D) and compression frequency (rpm) will determine the flow rate. The rule of thumb is to run the pump near 30 RPM (the slower the better) for an extruded hose life of about 800 hours. Since hose life is proportional to the amount and frequency of compression, using a larger size peristaltic pump will allow you to run at a lower RPM and require less hose compression.
The difference in input cost between the two different pump sizes may be offset by longer hose life and less frequent hose changes. If your pump is running > 8 hours per day, you should choose a pump closer to 30 RPM. Similarly, if your pump is only used for a few hours per day/week, you can run it at 60.
Pump shaft speed is achieved through a gearbox or geared motor, as the mechanical reduction using a standard 1500 RPM motor reduces the required motor size (HP). With the gearbox/motor selected, the maximum shaft speed is fixed and you can use the optional VFD to further reduce the shaft speed if desired.
The amount of compression applied to the peristaltic hose can be adjusted by adjusting the eccentric shaft of the extrusion roller or the shoe mounting spacer on the base. The initial installation procedure consists of installing the shim until the desired flow rate is reached, thereby minimizing compression of the hose.