Automatic speed changing device for water pump impeller

Abstract

The invention discloses an automatic speed changing device for a water pump impeller. The automatic speed changing device can well guide engine oil flowing out of a hydraulic coupler in the variable speed regulation and control work of a motor impeller through a through hole, a first drainage groove, a storage box, a second drainage groove and a collection box and has a good collection and storagefunction, so that the waste of engine oil can be prevented in the variable speed regulation and control work of the motor impeller by the hydraulic coupler, and the reduction of the working efficiency and the economic benefit of variable speed regulation and control is avoided. According to the automatic speed changing device, by arranging a drainage locking mechanism, fusible plugs on a hydraulic coupler main body variable speed regulation and control device can be well locked, so that the phenomenon of position looseness of the fusible plugs under long-time work is avoided, normal operationof variable speed regulation and control work of the water pump impeller is further guaranteed, and the stability of the variable-speed regulation and control work is improved.

Description

technical field [0001] The invention relates to the technical field of water pump devices, in particular to an automatic speed change device for water pump impellers. Background technique [0002] A pump is a machine that transports or pressurizes a liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali, emulsion, suspoemulsion and liquid metal, etc.; it can also transport liquid and gas mixtures And the liquid containing suspended solids; the impeller is the core component of the pump and the main factor affecting the working efficiency. The impeller of the pump is made of cast iron; the blades on the impeller of the pump play a major role; the shape and size of the impeller of the pump are related to the performance of the pump There is a close relationship; pump impellers can generally be divided into single-suct...

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Problems solved by technology

[0003] In the prior art, the speed regulation of the impeller is usually the speed regulation of the motor, the use of the hydraulic coupling and the speed increase gear, and the direct variable speed drive of the small steam turbine; When the impeller is performing variable speed adjustment work, when the temperature of the oil in the oil chamber is too high, the fusible plug set on the hydraulic coupling has a good protective effect on its memory, thereby ensuring the normal operation of its speed change. The fusible plug is A protection device for the coupler; under normal circumstances, the working temperature of the turbine oil is not allowed to exceed 100°C. In order to prevent accidents caused by excessively high working oil temperature, four fusible plugs are installed on the rotating shell of the coupler, and low melting point metals are installed inside; When the temperature of the oil in the working chamber of the coupler rises to a certain temperature, the metal is softened and blown out, and the working oil is discharged from the four holes, and the working oil is directly discharged through the middle pores of the fusible plug, thus taking away the heat and reducing the The temperature of the hydraulic coupling can be controlled to protect the hydraulic coupling. However, the connection between the hydraulic coupling and the fusible plug on it is usually a simple threaded connection. During the working process of the water pump, it is usually accompanied by vibration. Under continuous work, it is inevitable that the connection will become loose, which will affect the normal operation of the hydraulic coupling and the speed change of the water pump impeller. Moreover, the oil will flow out from the gap in the middle of the fusible plug, but there is no good drainage and collection mechanism, which in turn causes waste of engine oil and affects the economic benefits of work. For this reason, the present invention proposes an automatic speed change device for water pump impellers to solve the above problems

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