Non-pulsation pump having stroke adjustment mechanism

Patent metadata

Field	Value
Publication number	US-10890166-B2
Application number	US-201716327167-A
Country	US
Kind code	B2
Filing date	Apr 12, 2017
Priority date	Sep 1, 2016
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A non-pulsation pump is provided with: a cam mechanism that converts the rotational motion of a shared motor into reciprocal motion having a prescribed phase difference; a plurality of cross heads that make reciprocal motion with a prescribed phase difference through the cam mechanism; and a plurality of reciprocating pumps that are driven with a prescribed phase difference and that include plungers connected to the cross heads, wherein the total discharge flowrate toward a shared discharge pipe is kept constant. This non-pulsation pump includes a preliminary compression step for moving the plungers of the reciprocating pumps to a discharge side by very small amounts before a discharging step but after a suction step, and has a stroke adjustment mechanism for adjusting the effective stroke length of the plunger in the preliminary compression step. Thus, generation of pulsation can be suppressed even when the set pressure changes.

First claim

The invention claimed is:

1. A non-pulsation pump comprising:
a cam mechanism that converts a rotational motion of a shared motor into a reciprocal motion having a prescribed phase difference;
a plurality of cross heads that make a reciprocal motion with a prescribed phase difference through the cam mechanism; and
a plurality of reciprocating pumps that are driven with the prescribed phase difference and that include plungers connected to the cross heads, wherein
a total discharge flow rate into a shared discharge pipe is kept constant, and
the non-pulsation pump includes a preliminary compression step for moving the plungers of the reciprocating pumps to a discharge side by an amount after a suction step but before a discharging step, and
the non-pulsation pump further includes a stroke adjustment mechanism, the stroke adjustment mechanism comprising a body and a stopper, the stopper sliding in a front-rear direction with respect to the body, the stopper attached to the cross head in a manner whereby an axial direction position of the stopper with respect to the cross head changes, wherein a gap between a respective cross head of the plurality of cross heads and a respective plunger of the plurality of plungers in the axial direction is configured to be changed by adjusting the axial direction position of the stopper by rotating the body, the stroke adjustment mechanism thereby configured to adjust an effective stroke length of the plunger in the preliminary compression step.

2. The non-pulsation pump according to claim 1 , wherein
the cross head has a bottomed hole formed in a front end portion into which a step portion of a rear end of the plunger is inserted,
the stopper has an annular portion that is screwed into a thread portion formed on an inner peripheral surface of the bottomed hole, and a leading end of the annular portion comes into contact with a front surface of the step portion of the plunger.

Assignees

• Nikkiso Co Ltd

Inventors

• Murakoshi Fusao
• Sato Hideaki

Classifications

• F04B9/047 Primary

  the means being pin-and-slot mechanisms · CPC title

• F04B9/04

  the means being cams, eccentrics or pin-and-slot mechanisms · CPC title

• F04B53/001

  Noise damping · CPC title

• F05B2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F04B43/0045

  with a number of independent working chambers which are actuated successively by one mechanism · CPC title