JPS58129302U

JPS58129302U - fluid equipment

Info

Publication number: JPS58129302U
Application number: JP19803182U
Authority: JP
Inventors: 健二増田; 猛堀内; 靖中嶋
Original assignee: ダイキン工業株式会社
Priority date: 1982-12-23
Filing date: 1982-12-23
Publication date: 1983-09-01
Also published as: JPS605121Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の流体装置の回路図、第２図はこの考案の
一実施例の部分断面図、第３図は第２図に示す実施例の
作用説明図、第４．　５．　６図は夫々変形例の回路図
である。１・・・吐出量可変ポンプ、２・・・吐出量可変制御要
素、４・・・シリンダ、７Ｃ・・・タンク、８・・・主
流回路、１９・・・流量調整可変オリフィス、２４・・
・１次ポート、２５・・・２次ポート、２６・・・タン
クポート、−３０・・・圧力制御弁、３１・・・スプー
ル、３２・・・背圧室、３３・・・スプリング、５０・
・・アクチュエータ。FIG. 1 is a circuit diagram of a conventional fluid device, FIG. 2 is a partial sectional view of an embodiment of this invention, FIG. 3 is an explanatory diagram of the operation of the embodiment shown in FIG. 2, and FIG. 5. FIG. 6 is a circuit diagram of each modified example. DESCRIPTION OF SYMBOLS 1... Variable discharge amount pump, 2... Variable discharge amount control element, 4... Cylinder, 7C... Tank, 8... Mainstream circuit, 19... Variable flow rate adjustment orifice, 24...
・Primary port, 25... Secondary port, 26... Tank port, -30... Pressure control valve, 31... Spool, 32... Back pressure chamber, 33... Spring, 50・
...actuator.

Claims

[Scope of utility model registration request]

Variable discharge rate pump 1 having a characteristic of maintaining the discharge rate at the maximum value by biasing the variable discharge rate control element 2 in the direction of maximum inclination.
A variable flow rate adjustment orifice 19 is provided in the mainstream circuit 8 between the
The pressure in front of the variable flow rate adjustment orifice 19 is transmitted to one end of the spool 31 of the port type pressure control valve 30, and the variable flow rate adjustment orifice is transmitted to the back pressure chamber 32 at the other end of the spool 31 in which the spring 33 is compressed. The pressure control valve 30 is connected to the secondary port 25 and drives the variable discharge amount control element 2 in response to the differential pressure before and after the variable flow rate adjustment orifice 19. The cylinder 4 is switchably connected to the main circuit 8 connected to the primary port 24 and the tank line connected to the tank port 26 to control the discharge amount of the variable discharge pump 1. , the above variable flow rate adjustment orifice 1
9. A fluid device characterized in that the differential pressure before and after the reference numeral 9 is controlled to be substantially constant.