There are many designs of hose pumps, but there are only three types of hose pumps:
The first is the sliding shoe design (sliding shoe hose pump). The hose forms a U-shape or arc in the pump chamber; two or more sliding shoes (sliding blocks) are fixedly installed on the runner (arm) to compress the hose in a sliding manner. The wheel compresses the hose two or more times per revolution (depending on the number of shoes). Because friction heat is generated, in order to ensure normal operation, about half of the pump cavity is filled with lubricant. On the one hand, it is to reduce the friction coefficient, and more importantly, it is to transfer the generated friction heat to the pump body and discharge it out of the pump to ensure the pump's efficiency. normal operation. The advantage of this sliding shoe design is that it can achieve higher outlet pressure (up to 1.6Mpa).
The second design is based on the sliding shoe design, changing the sliding shoe to a small diameter pressure roller (multi-pressure roller hose pump). As the arm rotates once, the pressure roller also compresses the hose two or more times (depending on the number of pressure rollers). Compared with the sliding shoe design, this pressure roller design reduces damage to the hose and generates much less friction heat; it extends the life of the hose by up to 20% (in terms of revolutions) ). The starting torque and operating torque are accordingly reduced, reducing energy consumption. However, the number of compressions and frictional heat of two or more times per revolution still limit the speed. A two-inch pump can only operate continuously at a maximum of 40-50 rpm under high pressure.
The third design is that the hose forms a complete circle in the pump chamber, and a large-diameter pressure roller is used to compress the hose. This can be said to be a major breakthrough in the history of hose pump development.
2. Extra long hose life
The primary factor that determines the hose life is the number of times the hose is compressed; the second factor is the method, strength and friction of compressing the hose. hot. The best way to maximize hose life is to compress the hose less often, use compression methods that minimize damage to the hose, and use precise compression force.
1. The hose pump pressure roller only compresses the hose once per revolution - this decisively extends the hose life.
2. From the perspective of the degree of damage to the hose, the large-diameter pressure roller is undoubtedly stronger than the small-diameter pressure roller and sliding shoe. One of the important reasons why the service life of the traditional U-shaped pump hose is low is the impact of the pressure roller or sliding shoe on the inlet and outlet of the hose. Other parts of the hose are far from fatigue aging, but the parts where the inlet and outlet are in contact with the rotor were damaged and burst due to the strong impact of the rotor, thus making the entire hose scrapped.
The large-diameter pressure roller of the pump opens and closes the inner cavity of the hose more gently; when switching at the inlet and outlet, it reduces the impact on the hose and reduces the intensity of pulsation. Moreover, only one switching is performed per revolution, and only one pulse is generated. 3. Eliminates sliding friction - the contact area between the large-diameter pressure roller of the KP hose pump and the hose is more than twice larger than the small-diameter pressure roller of the multi-pressure roller pump, just like the large-diameter wide tire has better grip performance , completely eliminating sliding friction, and only a small amount of rolling friction heat is generated even under high pressure and high speed operation. Under the same conditions, the pump body temperature of the KP hose pump is 5 degrees lower than that of the multi-pressure roller pump.
4. Minimum compression force - the pressure roller or sliding shoe compression hose must have a certain amount of interference to completely close the inner cavity of the hose to ensure that it can withstand the high pressure of the outlet without causing damage. Internal leakage. Insufficient compression will cause backflow, reduced volumetric efficiency, reduced self-priming ability, and reduced flow rate; at the same time, impurities in the medium will violently wash away and wear the inner wall of the hose at the compression point, causing the hose life to decrease rapidly. Excessive compression will increase the bearing load and increase energy consumption. Even 1mm more interference compression will reduce hose life by 25%. So the correct compression force is an important factor in extending the life of the hose.
Under the same compression interference, the large-diameter pressure roller of the HPP pump presses on the hose, making 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 medium does not leak internally, the interference amount of the large-diameter pressure roller compression hose is only 1/2-1/3 of other compression methods, which is enough; this means longer hose life, Lower friction heat and longer hose life.
The above advantages make the hose life of KP hose pump 4-5 times that of traditional U-shaped hose pump at the same speed.
3. Greater flow rate - producing twice the maximum flow rate of traditional pumps of the same specifications (continuous operation)
1. Under the same conditions, a single pressure roller pump generates The flow rate is about 50% larger than that of the traditional U-shaped pump, which means that under the same flow rate, the single-pressure roller pump can achieve a lower speed; or it can achieve a greater flow rate at the same speed.
2. The ability to operate continuously at high speeds - KP hose pumps only generate a very small amount of friction heat and can operate continuously at high speed without the hidden danger of pump overheating. There is no distinction between intermittent and continuous operation. .
Traditional U-shaped hose pumps (whether multi-pressure roller pumps or multi-sliding shoe pumps) have great limitations on the pump speed due to the generation of a large amount of friction heat. For example, the maximum speed that a one-inch and a half-diameter traditional hose pump can operate continuously does not exceed 50 rpm, otherwise it will cause serious problems due to overheating. The KP hose pump one-inch and half-diameter pump can operate continuously at a maximum speed of 110 rpm.
A strong comparison with the traditional U-shaped pump parameters shows that the O-shaped hose pump produces approximately twice the flow rate (the maximum flow rate that can be continuously operated) of a traditional pump with the same specifications. In most cases, smaller HPP pumps can replace larger conventional U-shaped pumps. For example, to obtain a sustainable flow rate of 7 cubic meters per hour, a traditional U-shaped pump needs to choose a two-inch (50) or even two-and-a-half-inch (65) specification; while our company's one-and-a-half-inch specification (KP400) (40 caliber) is That's it.
Four. Less lubricant consumption
Because only a small amount of friction heat is generated, only light lubrication is needed between the pressure roller and the hose. The single lubricant consumption is only 1/5-1/10 of the traditional sliding shoe pump; coupled with the long service life of the hose, the total lubricant consumption is even more negligible. Reduces user cost.
5. Compact pump structure design - smaller space KP hose pump 1. The reducer is directly connected to the pump, eliminating the need for external couplings.
2. Small foot design - the pump base and pump body are integrally cast.
Under the same flow rate, the installation area occupied by the KP pump is about 1/4 of that of a traditional hose pump. —1/3.
Taken together, the third design, the single-roller hose pump, can achieve longer hose life, lower energy consumption and lubricant consumption, longer downtime intervals, less Manual maintenance costs, smaller footprint.
With the increase in use and maintenance costs, users are increasingly considering the full life cycle cost before choosing equipment. For hose pumps, the full life cycle cost includes initial purchase costs, electricity costs, maintenance costs (including hose and lubricant consumption), indirect losses caused by shutdown, etc. In fact, the initial purchase cost of a traditional hose pump only accounts for a small proportion of the entire life cycle cost, generally around 10%. The total cost of electricity and maintenance often accounts for about 80%.