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A gear pump and internal rotation technology, which is applied to rotary piston pumps, rotary piston machines, pumps, etc., can solve the problems of poor fluidity of high-viscosity materials
Inactive Publication Date: 2011-05-04
JIANGSU HONGLIU CHEM MACHINERY
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[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 h
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[0011] An improved internal rotation gear pump, including a pump cover 1, a pump casing 2, a driven shaft 4 and a driven gear 3, a driving shaft 7 and a driving gear 5, a pump seat 8, a shaft seal 9, and the abdomen of the driving gear 5 A number of material supply holes 11 are provided on the plate 10. The material supply holes 11 can be straight, oblique cylinder holes or cone holes. The material supply holes 11 communicate with the pump cavity 12 and the material dead zone 13 in the pump cavity. The material dead zone 13 in the pump cavity refers to the area surrounded by the right side of the web 10 of the pump driving gear, the inner surface of the pump casing, and the end face of the pump seat 8. A modified polytetrafluoroethylene sealing ring 6 is added to the left end of the pump seat 8.
[0012] Under the same conditions, the service life of the pump in different media before and after improvement:
[0013]
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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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Application Information
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