Improved inward rotation gear pump

Abstract

The invention relates to an improved inward rotation gear pump, which is used for conveying materials with high viscosity. The gear pump comprises a pump cover, a pump shell, a driven shaft, a driven gear, a driving shaft, a driving gear, a pump seat and a shaft seal, wherein a plurality of material supplementing holes are formed on a web plate of the driving gear; a pump cavity is communicated with a material dead angle area in the pump cavity through the material supplementing holes; and the material dead angle area in the pump cavity is an area enclosed by the right side of the web plate of the driving gear of the pump, the internal surface of the pump shell and the end face of the pump seat. The pump can make the materials in the dead angle area recover flowability and reduces residual amount; and the service life of the improved pump is one to two times longer than that of the unimproved pump, and the pump is more stably and safely operated.

Description

technical field [0001] The invention relates to an internally rotating gear pump, which is used for conveying high-viscosity materials in paint, coating, adhesive, petrochemical, food, medicine and other industries. Background technique [0002] At present, there are NCB internally rotating gear pumps on the market, which have been used for many years in paint, coating, adhesive, petrochemical, food, pharmaceutical and other industries. In actual use, it is found that when the pump transports high-viscosity materials (especially materials that are sensitive to temperature), the fluidity is very good after heating, and the fluidity is poor or even almost non-existent at room temperature, such as: resin, asphalt, grease, adhesives, chocolate syrup, syrup, etc.). This shows that the material is easy to transport at high temperature. Once the transport is stopped after a working cycle, the residual material in the pump will solidify, and the next time the pump is restarted, it ...

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Problems solved by technology

[0003] The present invention is to overcome the above disadvantages and provide an improved internally rotating gear pump, which solves the problem of poor fluidity of the residual high-viscosity material in the dead angle of the pump chamber at normal temperature or low temperature. A number of material supply holes are drilled on the web. After adding the material supply holes, no matter whether the pump shell and the pump cover have a heating jacket or not, as long as the material entering the pump cavity has been heated in advance and has good fluidity, it can be used. Make the material in the dead corner melt quickly

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