Rotor type immersible pump with eccentric shaft directly connected with motor

Abstract

The invention discloses a rotor type immersible pump with an eccentric shaft directly connected with a motor and the rotor type immersible pump is applicable to work under liquids. The rotor type immersible pump comprises a pump body, a rotor, a piston, the eccentric shaft, a pump seat and a submersible motor. According to the eccentric mechanism principle, the piston reciprocates; the eccentric shaft is directly arranged on a projecting shaft of the submersible motor; when the eccentric shaft is driven to rotate by the motor, the piston rotates around the eccentric shaft while reciprocating, so that liquid is sucked and discharged. Due to high-speed running, the piston conveys liquid twice when the rotor rotates for every turn and consequently the liquid flow is outputted steadily with no pulse, small vibration and low noise; besides, the rotor type immersible pump with a small size, a few parts, low cost, small hydraulic loss and small volume loss has efficiency of over 70% and remarkable energy-saving effect, and is an upgraded high-efficiency energy-saving product of a centrifugal immersible pump. In addition, the rotor type immersible pump has the good self-pumping performance of a displacement pump, thereby being capable of not only conveying water type liquids, but also pumping viscous liquids such as oils as well as gas-containing liquids; the application range of the rotor type immersible pump is expanded.

Description

technical field [0001] The invention relates to a displacement pump, in particular to a rotor submersible pump in which an eccentric shaft and a motor are directly connected and are suitable for underwater operations. Background technique [0002] At present, the known submersible pumps are centrifugal submersible pumps. This kind of pump has simple structure, few parts and low cost, so the market has a huge amount, but its efficiency is low, especially the efficiency of small centrifugal submersible pumps is extremely low. For example, China Machinery According to the efficiency specified in the industry standard JB / T8902-96 "Small Submersible Pump", the pump with a flow rate of 1.5 tons per hour and a head of 7 meters has an efficiency of 14.2%, and a pump with a flow rate of 3 tons per hour and a head of 8 meters The efficiency of the pump is 21.9%. It can be seen that the efficiency is extremely low, and it is an energy-consuming product. The reason is that the value of ...

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Problems solved by technology

[0002] At present, the known submersible pumps are centrifugal submersible pumps. This kind of pump has simple structure, few parts and low cost, so the market has a huge amount, but its efficiency is low, especially the efficiency of small centrifugal submersible pumps is extremely low. For example, China Machinery According to the efficiency specified in the industry standard JB / T8902-96 "Small Submersible Pump", the pump with a flow rate of 1.5 tons per hour and a head of 7 meters has an efficiency of 14.2%, and a pump with a flow rate of 3 tons per hour and a head of 8 meters The efficiency of the pump is 21.9%. It can be seen that the efficiency is extremely low, and it is an energy-consuming product. The reason is that the value of the specific speed of the pump is small. In addition, the impeller outlet width of the small centrifugal submersible pump is small, the casting process is poor, the surface of the blade channel in the impeller is rough, it is easy to be blocked by water plants, screw shells, impurities, etc., and it is easy to burn the motor in severe cases; for centrifugal The disadvantage of submersible pumps is to use positive displacement pumps instead of centrifugal pumps, because the efficiency of positive displacement pumps is generally 60%-90%; the efficiency of piston reciprocating pumps is very high, but because of the presence of check valves at the inlet and outlet , the reciprocating frequency of the pump is very low, and the structure is relatively complicated; I propose a small volume, simple structure, low cost, unobstructed flow channel, efficiency of more than 70%, high efficiency and energy saving for the shortcomings of the above-mentioned centrifugal submersible pump and other submersible pumps. The "rotor submersible pump" and obtained the patent right, the patent number is 201010202658.2

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