Title:
POSITIVE DISPLACEMENT PRESSURIZING/DEPRESSURIZING PUMP
Document Type and Number:
WIPO Patent Application WO/2021/200662
Kind Code:
A1
Abstract:
The present invention comprises: fluid delivery parts (21)-(27) each having a positive displacement variable mechanism (5), a first port (61), a second port (62), and a valve mechanism (7); and a pump flow path (3) formed by at least three of the fluid delivery parts (21)-(27) being connected in series, wherein the range of movement of pistons (51) includes a maximum positive displacement position (P1), a minimum positive displacement position (P3), and a switching position (P2), and the pump flow path (3) is configured such that a closing movement process (movement between P2-P3), in which the pistons (51) move between the switching position (P2) and the minimum positive displacement position (P3) by means of drive from a drive source (4), is performed sequentially through the fluid delivery parts (21)-(27) from a first inlet/outlet port (31) toward a second inlet/outlet port (32), or from the second inlet/outlet port (32) toward the first inlet/outlet port (31).
Inventors:
HARADA TOMOO (JP)
Application Number:
PCT/JP2021/012880
Publication Date:
October 07, 2021
Filing Date:
March 26, 2021
Export Citation:
Assignee:
ADVICS CO LTD (JP)
International Classes:
F04B1/0421; F04B1/0533
Domestic Patent References:
| WO2019138858A1 | 2019-07-18 | |||
| WO2015169215A1 | 2015-11-12 |
Foreign References:
| JPH1162817A | 1999-03-05 | |||
| JPS6184179U | 1986-06-03 | |||
| EP1555432A1 | 2005-07-20 | |||
| JPS5848784A | 1983-03-22 | |||
| JP2006009722A | 2006-01-12 |
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