Centrifugal water pump provided with two impellers

Abstract

The invention discloses a centrifugal water pump provided with two impellers. The water pump comprises a pump body (1); a water inlet (11) and a water outlet (12) are formed in two ends of the pump body (1); a water inlet partition (2) is arranged at the water inlet (11) to divide a water inlet channel into a first water inlet channel (21) and a second water inlet channel (22); a water outlet partition (3) is arranged at the water outlet (12) to divide a water outlet channel into a first water outlet channel (31) and a second water outlet channel (32); a motor assembly comprising a spindle (8) is arranged in the pump body (1); two ends of the spindle (8) are connected with a first impeller (41) and a second impeller (42); the first water inlet channel (21) and the second water inlet channel (22) are led into an inlet of the first impeller (41) and an inlet of the second impeller (42) from two sides of the pump body (1); and a liquid enters via the water inlet (11), enters the first impeller (41) and the second impeller (42) from two sides of the pump body (1) after being divided by the first water inlet channel (21) and the second water inlet channel (22), is collected in the first water outlet channel (31) and the second water outlet channel (32) after flowing out of the first impeller (41) and the second impeller (42) and flows out of the water outlet (12). The invention can be applied to the field of water pumps.

Description

technical field [0001] The invention relates to a water pump, in particular to a double impeller centrifugal water pump. Background technique [0002] Usually, the machines that lift the liquid, transport the liquid, or increase the pressure of the liquid, that is, change the mechanical energy of the prime mover into liquid energy to achieve the purpose of pumping the liquid, are collectively referred to as water pumps. Centrifugal water pumps have different types such as single-suction single impeller, double-suction symmetrical impeller, multi-stage impeller, etc., but micro centrifugal water pumps are all in the form of a single impeller, that is, one end of the motor output shaft is connected to an impeller. For micro water pumps, its efficiency It cannot be fully utilized. Generally, the efficiency of micro water pumps is 10-50%, which is far from the efficiency of 60-90% of large water pumps. The single impeller water pump has a strong axial force during operation, an...

AI Technical Summary

Problems solved by technology

The existing micro-water pumps run water on one side. Due to the air, sometimes it is difficult for the water flow to enter the bearing position at the far water end, causing the bearing at the far water end to not be fully lubricated with water, and it is easy to cause dry friction between the bearing and the shaft. The heat generated during friction cannot be taken away quickly, and the accumulated heat will generate high temperature, which will easily damage the bearing and reduce the life of the bearing; in order to fully lubricate the bearing at the far end of the impeller, some water pumps have added an exhaust valve near the far end bearing, but for Non-professional users seldom use the exhaust valve to exhaust. If the exhaust valve is not used in time, the air inside the pump body will prevent the water from reaching the bearing at the far end for lubrication, resulting in poor lubrication or even failure.

[0003] In addition, the existing water pump adopts an L-shaped flow channel, and the water inlet direction is perpendicular to the impeller, so the potential energy of the incoming water is rapidly and greatly reduced, and the potential energy of the water is not fully utilized.

There is also an existing double-suction pump structure driven by an external motor. The pump body is independent of the motor. There is a shaft running through the middle of the impeller of the pump, and the shaft is supported by both ends, so that there is a certain resistance loss to the flow of water. It needs to be supplemented by a corresponding structure, which increases the structural complexity of the pump

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