SU453106A1 - Eccentric piston pump - Google Patents

Description

one

The invention relates to piston pumps with a driven eccentric.

Eccentric piston cylinders with rolls, imis telescopic cylinder-piston bunks supported on the inner surface of the housing and on the eccentric of the drive shaft are known.

The distribution of the working fluid in a known machine is carried out through a rotating axial valve.

However, when used as a high-speed pump for high pressure (500 kgf / cm and above), this machine has low suction capacity and low volumetric efficiency (due to increased harmful volumes of working chambers formed by cylinder-piston pairs).

This disadvantage is due to the fact that the distribution of the fluid occurs only through axial channels in the pistons, which communicate working chambers with a rotating axial spool.

The purpose of the invention is to improve the suction capacity of the pump.

The goal is achieved by the fact that the pistons, in which the channels for diverting liquid to the discharge valve are made, are supported through a spherical support with hydrostatic unloading onto the body part, and the cylinders are driven by an eccentric drive

shaft. A groove is made in the eccentric, communicating the working chambers with the pump casing with which the suction line is connected. The reduction of harmful volumes is due to the fact that the working chambers are as close as possible to the eccentric of the non-drive shaft through which the working fluid is supplied. The liquid is discharged through channels in the pistons, the cross sections of which may be smaller than the cross sections of the channels for the passage of the intake l; liquid.

Replacing the rotatable axial slide valve and the channels connecting the working chambers with the distribution surface of the slide valve, the groove in the eccentric of the drive shaft, the channels in the pistons and the discharge valves, simplify the design of the pump.

In the drawing, the described pump is schematically depicted, a longitudinal section.

The pasos has a housing 1, in the bore of which a bearing shaft 4 with an eccentric 5 is mounted on bearings 2 and 3. The groove 6 is made on the eccentric surface. The groove 6 is designed to periodically communicate the working chamber with the pasas crankcase. In the axially cylindrical bores of the housing there are enclosures 7 of injection valves 8 loaded with springs; 9. In cases 7 there are channels 10 for discharging the pressurized working fluid and channels 11 for supplying the working fluid to the pressure valve.

A recess with a spherical surface 12 is made on the side surface of the body of each injection valve. The piston 13 with a channel 14 for spraying the injected fluid with a spherical surface rests on the spherical surface 12 of the pressure valve body, forming a hydrostatic discharge chamber 15 with it. The cylinder 16, having a working chamber 17 and a chamber 18 for hydrostatic unloading, is supported by an eccentric of the drive shaft. Thus, the working chamber 17 is as close as possible to the eccentric 5, which ensures the reduction of harmful volumes.

Constant contact of the piston and the cylinder with the surfaces of the pressure valve and eccentric casing is provided by a spring 19. To the body in which the opening 20 is provided for the supply of the working fluid, the cover 22 is fastened with screws 21 to the opening 23 to discharge the discharge fluid ..;

When vrash, the yenin of the drive shaft 4 is in contact with the eccentric 5, the cylinder 16 performs a reciprocating and swinging movement. With the cylinder 16 to increase the volume, the released volume of the working chamber 17 is filled with the working fluid supplied to it from the pump housing through the groove 6 and the chamber 18. As the working chamber 17 is made

as close as possible to the eccentric 5, the distributor, the suction path from the distributor to the working chamber, is reduced. This improves the engine's intake capacity and reduces harmful volumes.

With a maximum increase in the working chamber, the edge of the naza 6 does not cover the reach of the working fluid into the working chamber. When the cylinder moves backward, it is displaced.

the working fluid through the channels 14, And, 10 through the chamber 15 and the discharge valve 8 enters the hole 23.

Claims (1)

Invention Formula An eccentric piston pump with oscillating telescopic cylinder-piston couples supported by an eccentric and a housing detail, characterized in that, in order to improve the pump's suction capability, the nozzles rest on the housing detail, and the cylinders onto the eccentric, which has a groove for connecting the cavities of the cylinders with the cavity shell when making suction moves. 7 fff S 3 f / J /.II I I //