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Title:
NON-PULSATING PUMP
Document Type and Number:
WIPO Patent Application WO/2018/047396
Kind Code:
A1
Abstract:
This non-pulsating pump (100) has a rotary cam (15) which converts a rotary motion of a servomotor (11) into a reciprocating motion and through which first and second pumps (20, 40) are driven with a phase difference of 180°, and includes, after an intake stroke and before a discharge stroke, a preliminary compression stroke in which plungers (26, 46) of the first and second pumps (20, 40) are moved to a discharge side by a slight amount and then stopped. A control unit (70) for adjusting the rotating speed of the servomotor (11) consecutively prolongs, during every preliminary compression stroke, the time period in which the rotating speed of the servomotor (11) is reduced from a predetermined rotating speed R0 when the pressure of a common discharge tube (36) during the preliminary compression stroke is higher than the pressure of the common discharge tube (36) during the discharge stroke. Thus, even when a set pressure is changed, pulsation occurrence can be suppressed.

Inventors:
MURAKOSHI Fusao (NIKKISO CO. LTD., 2-16-2, Noguchi-cho, Higashimurayama-sh, Tokyo 20, 〒1898520, JP)
SATO Hideaki (NIKKISO CO. LTD., 2-16-2, Noguchi-cho, Higashimurayama-sh, Tokyo 20, 〒1898520, JP)
Application Number:
JP2017/014932
Publication Date:
March 15, 2018
Filing Date:
April 12, 2017
Export Citation:
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Assignee:
NIKKISO CO., LTD. (4-20-3, Ebisu Shibuya-k, Tokyo 22, 〒1506022, JP)
International Classes:
F04B11/00; F04B9/04; F04B13/00; F04B49/06
Foreign References:
US4359312A1982-11-16
JPH09264261A1997-10-07
JPH10252644A1998-09-22
Attorney, Agent or Firm:
YKI PATENT ATTORNEYS (1-34-12, Kichijoji-Honcho Musashino-sh, Tokyo 04, 〒1800004, JP)
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