Efficient permanent magnet submersible mixer with sand prevention and winding prevention functions

Abstract

The invention discloses an efficient permanent magnet submersible mixer with sand prevention and winding prevention functions, which comprises an impeller, a flow guide cover, a miniature impeller, a mechanical sealing seat and a motor. The mechanical sealing seat is assembled on the motor, a hub shaft is assembled at the end part of a rotor shaft of the motor, and the end surface of a hub body is in clearance fit with the end surface of the mechanical sealing seat to form a labyrinth seal. A flushing cavity is formed between a hub body and the mechanical sealing seat. The flow guide cover is connected with the mechanical sealing seat and is positioned in the flushing cavity. The micro impeller is arranged on the hub shaft and is positioned in the flow guide cover. The flow guide cover comprises a cover body and an intercepting body, and the intercepting body is arranged at an opening in the end, away from the mechanical sealing seat, of the cover body. According to the efficient permanent magnet submersible mixer, sand grains and fibers entering the cavity of the hub can be effectively collected, liquid in the cavity can be effectively purified, a mechanical seal is not directly washed, circulation of the liquid containing particles and fibers around the mechanical seal is promoted, and long-term safe operation of the mechanical seal is protected.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a high-efficiency permanent magnet submersible mixer with functions of sand prevention and winding prevention. Background technique [0002] Submersible mixers are widely used in domestic sewage, industrial wastewater treatment processes or for surface source treatment of water bodies. The motors of submersible mixers are three-phase asynchronous motors, which are based on continuous duty (S1) and consume a lot of energy. If the submersible mixer adopts a high-efficiency three-phase permanent magnet synchronous motor, it will play a great role in reducing the user's operating costs. The motor of the high-efficiency permanent magnet submersible mixer has great space and advantages in improving efficiency and power factor because the permanent magnet excitation is placed in the rotor core of the three-phase induction motor. [0003] The impeller inst...

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Problems solved by technology

[0004] 1. The composition of domestic sewage and industrial wastewater is complex, containing a large amount of sand and fine fibers. During the operation of the submersible mixer, solid particles will be deposited in the cavity where the mechanical seal is located, and the fibers will be entangled on the mechanical seal.

On the one hand, it destroys the sealing surface of the mechanical seal, causing the liquid to enter the motor cavity; on the other hand, it makes it difficult to dissipate heat from the sealing surface, which affects its service life

[0005]2. Since there is always a certain gap between the impeller and the mechanical seal seat, some of the particles and fine fibers in the sewage will inevitably enter the mechanical seal In the cavity where it is located, it affects the safe use of mechanical seals

[0006] 3. The sand control measures in the prior art generally use fluid to directly flush the mechanical seal, so that the fluid containing particles and entanglements directly flushes the sealing surface and the rubber sheath, which is easy to damage the sealing surface and the rubber sheath, and the fibers are entangled in the mechanical seal. On the seal, the water ingress of the mechanical seal will fail, which will affect the safe operation of the mechanical seal

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