Plunger ported axial plunger hydraulic pump

Abstract

The invention provides a plunger distribution axial plunger hydraulic pump, which belongs to the type of a positive-displacement pump. The invention aims at solving the problems of the prior art, namely, to reduce friction pairs working in the sea and fresh water and PV values thereof, reducing material requirements of the friction pairs, improving efficiency, and reducing noise and size. Plungerholes are arranged on the reference circle of a cylinder body, and are communicated with an absorption inlet and a water outlet arranged on the cylinder body. A plunger is slip fit to the plunger holes. A crankshaft is arranged on an end cover through a bearing. A sloping plate arranged on the bellcrank of the crankshaft is flexibly connected with the plunger through a bulb connecting rod. The plunger is a stepped shaft-type slide valve. The number of the plunger holes is 4XN. An accessory pore is arranged near each plunger hole, and is communicated with the corresponding plunger hole at the waist through a fabrication hole. The end of each plunger hole is communicated with the end of the corresponding accessory hole of the adjacent plunger hole of 90 degrees through a spiral groove. The invention has the advantages of compact structure, stable performance, low noise and large flow, and is applicable for transportation of sea water / fresh water and other low viscous liquid, or can be used as a power component of a hydraulic actuation system.

Description

technical field [0001] The invention belongs to positive displacement pumps, and specifically relates to a plunger distribution axial plunger hydraulic pump, which is especially suitable for pumping medium and high pressure seawater, fresh water or other low-viscosity liquids, and is applied to working occasions requiring low noise. Background technique [0002] At present, hydraulic systems widely used in various industrial sectors mainly use mineral oil as the working medium, which not only wastes oil resources, but also has the disadvantages of being flammable and polluting the environment. Therefore, the world has been developing hydraulic pumps that use sea (fresh) water instead of mineral oil as the working medium. The newly developed sea (fresh) water pumps at home and abroad mostly adopt end face flow distribution and sliding shoe / swash plate structure, or valve flow distribution and sliding shoe / swash plate structure. For example: the water medium hydraulic pump pr...

AI Technical Summary

Problems solved by technology

Sliding shoe / swash plate structure plunger pump, the radial pressure of the plunger on the cylinder (cylinder liner) is large, the PV value acting on the friction pair of the plunger / cylinder (cylinder liner) is large, and the sea (fresh) water Strong corrosion and poor lubricity. Therefore, the friction pair of this structure cannot use general metal materials. It mainly uses engineering ceramics and other special engineering materials and special processing methods. It is difficult to select materials and process, and the production cost is high, which is not conducive to the production of this type of pump. Manufacturing and Promoting Applications

The No. 200510018718.4 "Sea / Freshwater Axial Piston Hydraulic Pump" proposed by Huazhong University of Science and Technology is a valve-distributed flow-type plunger pump. The plunger holes are uniformly arranged on the index circle of the pump cylinder, and each plunger hole is connected to the cylinder through the channel. The water suction port and water outlet on the body, the plunger and the plunger hole are slidingly matched, the cylinder body is rigidly connected with the pump casing, and the crankshaft is installed on the pump casing through a supporting bearing; the lower end of the crankshaft is 5° to 30° from the crankshaft axis °acute angle, forming the end crankshaft; the swash plate is installed on the bell crank at the lower end of the end crankshaft through the supporting bearing; the positioning guide slider is installed on the outside of the swash plate, and the latter slides and cooperates with the guide chute fixed on the pump casing in the axial direction ; The swash plate is flexibly connected to the plunger through a ball joint rod, the universal ball joint at one end of the connecting rod is installed on the indexing circle of the swash plate, and the universal ball joint at the other end of the connecting rod is connected with the plunger; Due to the long-term high-speed impact of the distribution valve, the plunger pump has the disadvantage of high noise, which is difficult to apply in occasions that require low noise

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