The first is slipper design (slipper hose pump). The hose is U-shaped or arched in the pump cavity; Two or more sliding shoes (sliders) are fixedly installed on the rotating wheel (rotating arm) to compress the hose in a sliding manner. The runner compresses the hose two or more times per revolution (depending on the number of shoes). Because of the friction heat, in order to ensure the normal operation, about half of the pump cavity is filled with lubricant, on the one hand, to reduce the friction coefficient, and more importantly, to transfer the generated friction heat to the pump body and discharge it from the pump, thus ensuring the normal operation of the pump. The advantage of this slipper design is that it can reach higher outlet pressure (up to 1.6Mpa).
The second design is based on the slipper design, and the slipper is changed into a small diameter roller (multi-roller hose pump). When the rotary arm rotates once, the pressure roller will also compress the hose twice or more (depending on the number of pressure rollers). Compared with the slipper design, this pressure roller design reduces the damage to the hose and generates much less friction heat. The service life of the hose is prolonged by 20% (in terms of revolutions). Therefore, the starting torque and the running torque are reduced, and the energy consumption is reduced. However, the number of compression and frictional heat, which are still two or more times per revolution, still limit the speed. A two-inch pump can only run continuously at a maximum speed of 40-50 rpm under high pressure.
The third design is that the hose is surrounded by a whole circle in the pump cavity, and the hose is pressed by a large-diameter press roller. This can be said to be a major breakthrough in the history of hose pump development.
Second, the hose has a long life.
The main factor that determines the life of the hose is the number of times the hose is compressed; The second factor is the way of compressing the hose, strength and friction heat. The best way to maximize the service life of the hose is to reduce the compression times of the hose, and adopt the compression method with the least damage to the hose to compress the hose accurately.
1. The hose pump roller only compresses the hose once every turn, which decisively prolongs the service life of the hose.
2. Judging from the damage degree of the hose, the large-diameter pressure roller is undoubtedly stronger than the small-diameter pressure roller and slipper. One of the most important factors for the low service life of traditional U-shaped pump hose is the impact of pressure roller or slipper on the inlet and outlet of hose. Other parts of the hose are far from fatigue aging, but the parts of the inlet and outlet that are in contact with the rotor are damaged and burst due to the strong impact of the rotor, so the whole hose is scrapped.
The large-diameter pressure roller of the pump moves gently when opening and closing the inner cavity of the hose; When the inlet and outlet are switched, the impact on the hose is reduced and the pulsation intensity is reduced. Furthermore, switching is performed only once per revolution, and only one pulse is generated. 3. Eliminate sliding friction-The contact area between the large-diameter roller of ——KP hose pump and the hose is more than twice that of the small-diameter roller of multi-roller pump. Just as the large-diameter wide tire has better grip on the ground, it completely eliminates sliding friction and only generates a small amount of rolling friction heat even at high pressure and high speed. Under the same conditions, the pump body temperature of KP hose pump is 5 degrees lower than that of multi-roller pump.
4. Minimum compressive strength-the pressure roller or slipper must have a certain amount of interference to compress the hose, so that the inner cavity of the hose is completely closed, so as to ensure that it can resist the high pressure at the outlet without internal leakage. Insufficient compression will lead to reflux, decreased volumetric efficiency, decreased self-priming ability and decreased flow rate; At the same time, impurities in the medium will seriously scour and wear the inner wall of the hose at the compression position, which will quickly reduce the service life of the hose. However, excessive compression will increase bearing load and energy consumption. Even with multiple interference compression 1mm, the service life of the hose will be reduced by 25%. Therefore, the correct compressive strength is an important factor to prolong the life of hose.
Under the same compression interference, the large-diameter roller of HPP pump presses on the hose, which makes the sealing surface formed in the inner cavity of the hose several times that of the traditional U-shaped pump. In this way, on the premise of ensuring that the internal medium does not leak, the interference of large-diameter compression hose is only 1/2- 1/3 of other compression methods. This means longer hose life, lower friction heat and longer hose life.
All these advantages make the hose life of KP hose pump 4-5 times longer than that of traditional U-hose pump at the same speed.
Third, larger flow rate-twice the maximum flow rate of traditional pumps with the same specifications (continuous operation)
1. Under the same conditions, the single-roller pump produces about 50% more flow per revolution than the traditional U-shaped pump, which means that the single-roller pump can achieve a lower speed under the same flow. Or get more flow at the same speed.
2. High-speed continuous operation ability-KP hose pump can run continuously at high speed because it only generates a little friction heat, and there is no hidden danger of overheating of the pump, and there is no distinction between intermittent operation and continuous operation.
The traditional U-shaped hose pump (whether multi-roller pump or multi-watt pump) has a great limitation on the rotational speed of the pump because it produces a lot of friction heat. For example, the maximum speed of the traditional one-and-a-half-inch hose pump cannot exceed 50 rpm, otherwise it will cause serious problems due to overheating. The maximum continuous running speed of KP hose pump is 1 10 rpm.
Compared with the traditional U-type pump, the O-type hose pump produces about twice the flow rate of the traditional pump of the same specification (the maximum flow rate that can run continuously). In most cases, the small HPP pump can replace the larger traditional U-shaped pump. For example, to achieve a sustainable flow of 7 cubic meters per hour, the traditional U-shaped pump needs to choose the specifications of two inches (50) or even two and a half inches (65); And my company's one-and-a-half inch specification (KP400)(40 caliber) will do.
Four little lubricant consumption
Because only a small amount of friction heat is generated, only slight lubrication is needed between the pressure roller and the hose. The consumption of a single lubricant is only1/5-110 of the traditional slipper pump; Coupled with the long life of the hose, the total consumption of lubricating oil is even more negligible. And the use cost of users is reduced.
5. The structural design of the pump is compact-smaller space-KP hose pump 1, the reducer is directly connected with the pump, and the external coupling is cancelled.
2. Small foundation design-the pump base and pump body are integrally cast.
Under the same flow rate, the installation area of KP pump is about 1/4- 1/3 of that of traditional hose pump.
To sum up, the third design, that is, single roller hose pump, can achieve longer hose life, lower energy consumption and lubricant consumption, longer downtime interval, less manual maintenance cost and smaller floor space.
With the increase of use and maintenance costs, users are increasingly considering the life cycle cost before choosing equipment. For hose pumps, life cycle costs include initial costs, electricity charges, maintenance costs (including hose and lubricant consumption), indirect losses caused by downtime, etc. In fact, the initial cost of traditional hose pump only accounts for a small part of the whole life cycle cost, generally around 10%. The total electricity and maintenance costs often account for about 80%.