L-shaped external gear pump suitable for ultralow-viscosity medium

An ultra-low viscosity, gear pump technology, applied to rotary piston/oscillating piston pump components, pumps, pump components, etc., can solve problems such as increased internal leakage, persistent outlet pressure, and decreased pump volumetric efficiency

Inactive Publication Date: 2017-04-05
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The common feature of water and liquid ammonia is the ultra-low viscosity of the medium. When the conventional oil-medium external gear pump uses this type of ultra-l...

Method used

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  • L-shaped external gear pump suitable for ultralow-viscosity medium
  • L-shaped external gear pump suitable for ultralow-viscosity medium
  • L-shaped external gear pump suitable for ultralow-viscosity medium

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Embodiment

[0017] Example: L-type external gear pump for ultra-low viscosity medium with given volumetric efficiency.

[0018] The present invention includes 1 pressure plate, 2 shaft sealing ring, 3 front cover, 4 pump casing seal, 5 outer sealing ring of floating bushing, 6 pair of floating bushing, 7 self-lubricating sliding bearing, 8 flat key at driving shaft end, 9 driving shaft, 10 a pair of meshing gears, 11 pump casing, 12 positioning pin, 13 fixing screw, 14 shaft-gear flat key, 15 driven shaft.

[0019] According to the existing relevant research theories verified by experiments, the radial leakage in the radial friction pair is obtained q a , the axial leakage in the axial friction pair q z As shown in the following formula.

[0020]

[0021] In the formula, z is the number of teeth; z 0 is the number of teeth in the transition zone; α 0 is the wrap angle of the transition zone; Δ p The differential pressure is the outlet pressure minus the inlet pressure; b is ...

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Abstract

The invention discloses an L-shaped external gear pump suitable for an ultralow-viscosity medium. The provided L-shaped structure for realizing lateral flow-in of the medium and axial flow-out at a rear end aims at the design requirements of ultralow viscosity of 0.00018 Pa.s and high volumetric ratio of above 90%, so damages of convectional later outlets to the strength and the rigidity of a pump shell are avoided, and the thickness of the pump shell is properly reduced. Optimal gear pair parameters make the pump have a smallest size under given design conditions and reduce the spacecraft launching cost. The shape and position dimensions of a rear end medium outlet accord with circular unloading groove design, and also has an outlet side pocketed oil unloading function, A large included angle of an inlet compensates the cavitation phenomenon caused by insufficient self suction, and combination of a small included angle of the outlet with automatic compensation of a floating shaft sleeve effectively controls axial leakage and indirectly improves the volumetric ratio. Compared with convectional ground oil pumps, the pump disclosed in the invention has the profile characteristics of small axial dimension and large radial dimension.

Description

technical field [0001] The invention relates to an external gear pump, in particular to an external gear pump suitable for ultra-low viscosity medium. Background technique [0002] External gear pump is a power tool for pumping working oil. Because of its advantages in price, reliability, life and self-priming ability, it is widely used in conventional oil medium applications. In the aerospace environment with narrow space, high launch cost and weightlessness, external gear pumps have simple structure, small size, light weight, high reliability, long life, especially good self-priming, low pollution sensitivity, and easy maintenance And other characteristics, recently it is considered to be a better choice to partially replace the existing aerospace pumps. At present, external gear pumps are used in the water treatment systems of foreign spacecraft, especially the International Space Station; similarly, liquid ammonia external gear pumps are also widely used in the thermal ...

Claims

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Application Information

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IPC IPC(8): F04C2/18F04C15/00
Inventor 李玉龙姚旗谢文李鹏
Owner CHENGDU UNIV
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