JPH0447195U

JPH0447195U -

Info

Publication number: JPH0447195U
Application number: JP8855890U
Authority: JP
Priority date: 1990-08-23
Filing date: 1990-08-23
Publication date: 1992-04-22
Anticipated expiration: 2005-08-23
Also published as: JP2553213Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例における吐出側流路
圧制御装置を備えた遠心ポンプの断面図、第２図
および第３図は各々別の実施例における遠心ポン
プの一部切欠正面図である。１……ポンプケーシング、１ａ，１５……壁体
、４……移動軸、５……回動軸、６……開放羽根
車、６ａ……羽根、６ｂ……開放端縁、２１……
電動機、２５……動力変換装置、３１……吐出側
流路、３５……制御装置、４０……軸受、ａ……
間隙。 FIG. 1 is a sectional view of a centrifugal pump equipped with a discharge side flow path pressure control device according to one embodiment of the present invention, and FIGS. 2 and 3 are partially cutaway front views of centrifugal pumps according to different embodiments. be. DESCRIPTION OF SYMBOLS 1... Pump casing, 1a, 15... Wall body, 4... Moving shaft, 5... Rotating shaft, 6... Open impeller, 6a... Vane, 6b... Open edge, 21...
Electric motor, 25...Power conversion device, 31...Discharge side flow path, 35...Control device, 40...Bearing, a...
gap.

Claims

[Claims for Utility Model Registration] 1. A single-stage or multi-stage centrifugal pump having at least one open impeller; A wall body is attached to the other end of a moving shaft whose one end protrudes outside the pump casing and is supported so as to be movable in the axial direction, and the wall body is connected to the moving shaft through a power conversion device that converts rotational motion into linear motion. an electric motor that reciprocates in the axial direction; and a control device that detects hydraulic pressure at a predetermined location in the discharge side flow path of the centrifugal pump and controls the electric motor, If the hydraulic pressure exceeds a second predetermined value, the wall body is moved in a direction that increases the gap between the wall and the open end edge of the blade, and if the hydraulic pressure becomes equal to or less than a second predetermined value, which is slightly smaller than the set value, Discharge side flow path pressure control of a centrifugal pump, characterized in that the fluid pressure is always maintained at approximately a set value by moving the wall body in a direction where the gap between the wall body and the open end edge of the vane becomes smaller. Device. 2. In a single-stage or multi-stage centrifugal pump having at least one open impeller in which the open edges of the blades face a fixed wall with a slight gap, the rotary pump to which said open impeller is mounted A bearing that rotatably supports the shaft is attached to the other end of the moving shaft that is supported so as to be movable in the axial direction, and the moving shaft is moved to the axial center via a power conversion device that converts rotational motion into linear motion. a first predetermined motor in which the liquid pressure is slightly higher than a set value; If the value exceeds the set value, the open impeller is moved in a direction that increases the gap between the open end edge of the blade and the wall, and the fluid pressure becomes equal to or less than a second predetermined value, which is slightly smaller than the set value. For example, a centrifugal pump characterized in that the fluid pressure is always maintained at approximately a set value by moving the open impeller in a direction in which a gap between the open end edge of the blade and the wall becomes smaller. Discharge side flow path pressure control device.