不锈钢多级油泵的工作原理介绍（Introduction to the working principle of stainless steel multistage oil pump）.docVIP

不锈钢多级油泵的工作原理介绍（Introduction to the working principle of stainless steel multistage oil pump） First, we must define several concepts 1. displacement control source signals are: front pump oil flow, after pump oil flow and pilot two oil flow and negative flow, wherein the front pump oil flow control a piston, after the pump oil flow control level piston And the swash plate piston (small end, end control swashplate piston in a normally open state, one control end in a normally closed state, the main control end pressure piston), negative flow control level of living Plug, pilot two times oil flow control, two stage piston The 2. control element is Slide valve: it is a three position three-way valve. It is composed of a spool and a slip sleeve. They can move relative to each other. The movement of the spool is composed of a first piston and a two piston at the right end of the valve core and a spring arranged at the left end of the valve core. The movement of the sliding sleeve is controlled by the swashplate piston and moves along with the movement of the swashplate piston. The distance and direction of its movement are consistent with that of the swashplate pistons. The two stage: in the control condition, the piston flow control alone two piston pilot two oil, the negative flow is not involved in direct control, but by the negative pressure sensor pressure parameters, provided to the computer, the computer is calculated as a parameter to control the electric current of proportional valve to control the first two times in the oil flow; the hydraulic control state, two pilot oil flow is hydro electric control valve cut off, does not participate in the control of the two level of the piston by the negative flow separately on the two stage piston direct control. The working direction of the two stage piston is to push the slide valve spool to move to the left Spring return balance. The first stage piston pump flow: from the front, after the pump oil flow and a pilot oil