Canned pump

a magnetic pump and pump body technology, applied in the direction of positive displacement liquid engines, pump components, fluid engines, etc., can solve the problems of frequent failure of liquid feeding, no lubricating oil can be used at the bearing sections of the impeller shaft, etc., to achieve excellent durability, low maintenance cost, and low friction coefficient

Inactive Publication Date: 2006-11-02
KURITA SEISAKUSHO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] In consideration of the above-mentioned circumstances, the present invention is intended to provide a canned pump wherein the bearing sections for the impeller shaft are prevented from being broken and suppressed from being worn even if a dry operation state occurs or the working liquid becomes a gas-liquid mixture state temporarily, thereby being capable of being excellent in durability and low in maintenance cost.
[0012] For the purpose of attaining the above-mentioned object, in a canned pump constructed according to the present invention, the sliding contact members interposed in the bearing sections for the impeller shaft have a diamond-like carbon (DLC) film on the sliding contact faces thereof. Since this DLC film is extremely hard, has a very low friction coefficient and is excellent in the adhesion strength to the base material thereof, such as ceramic or cemented carbide, the sliding torque at the sliding contact face therebetween is reduced to a small value even if a dry operation state occurs temporarily because of an operating error or the like at the start of liquid feeding or at the time when liquid feeding is resumed after operation interruption. Hence, breakage owing to load impact is prevented, and abrasion hardly occurs. Furthermore, even if the sliding contact members having been heated by frictional heat generation are quickly chilled by supplying liquid without allowing a sufficient time after dry operation, separation and cracks owing to heat shock do not occur, whereby subsequent liquid feeding can be carried out in a proper state. On the other hand, even in the case where the working liquid becomes a gas-liquid mixture state owing to improper air venting in the previous stage or because of air bubbles generated from the liquid, the sliding contact members are not broken and are suppressed from being worn, and normal operation can be resumed thereafter, and liquid feeding can be carried out without problems.

Problems solved by technology

However, in such a canned pump, no lubricating oil can be used at the bearing sections for the impeller shaft because of its structure.
However, such a conventional canned pump falls into the so-called dry operation state wherein the impeller is rotated while no liquid is distributed to the inside of the can, owing to an operating error or the like when liquid feeding is started or when liquid feeding is resumed after operation interruption.
As a result, the bearing sections for the impeller shaft are broken shortly after the start of operation, and liquid feeding is frequently made impossible.
Furthermore, the working liquid becomes a gas-liquid mixture state owing to improper air venting in the previous stage or because of air bubbles generated from the liquid, and the bearing sections for the impeller shaft fall into a dry sliding contact state intermittently and are worn, whereby the sliding contact members are frequently forced to be replaced at an early stage.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0020] As shown in FIG. 1 and FIG. 2, the casing 1A of a magnet pump P1 in accordance with the first embodiment comprises a front casing member 11 equipped with a liquid suction port 11a and a liquid delivery port 11b, a cylindrical intermediate casing member 12 connected to this front casing member 11 at the front end flange section 12a thereof via a ring-shaped flange member 14 and bolts 15a, and 15b, and a cylindrical rear casing member 13 connected to the rear end flange section 12b of this intermediate casing member 12 at the front end flange section 13a thereof via bolts 15c. The inside of the casing 1A is divided into a pump chamber 1a on the side of the front casing member 11 and a magnetic coupling chamber 1b on the side of the intermediate casing member 12 by a partition plate 16 interposed between the front casing member 11 and the intermediate casing member 12. Furthermore, a pump drive section comprising a motor, not shown, is provided on the side of the rear casing mem...

second embodiment

[0032] The casing 1B of a magnet pump P2 in accordance with a second embodiment shown in FIG. 4 comprises a front casing member 31 equipped with a liquid suction port 31a and a liquid delivery port 31b, a cylindrical intermediate casing member 32 connected to this front casing member 31 at the front end flange section 32a thereof via bolts 15e, and a cylindrical rear casing member 33 connected to the rear end flange section 32b of this intermediate casing member 32 at the front end flange section 33a thereof via bolts 15f. In addition, inside the casing 1B, the front end flange section 2e of a cylindrical can 2B having a bottom is held between the opposed end faces of the front casing member 31 and the intermediate casing member 32, whereby the cylindrical can 2B is disposed with the bottom section 2f directed rearward. Furthermore, the inside of the casing 1B is divided by this can 2B into a drive-side space 20a on the outside of the can 2B and a driven-side space 20b extending fro...

third embodiment

[0039] The casing 1C of a canned motor pump P3 in accordance with a third embodiment shown in FIG. 5 comprises a front casing member 51 equipped with a liquid suction port 51a and a liquid delivery port 51b, a partition plate 52 connected to this front casing member 51 at the peripheral portion thereof via bolts 15g, a nearly cylindrical rear casing member 53 connected to this intermediate partition plate 52 at the front end flange section 53a thereof via bolts 15h, a rear end plate 54 connected to the rear end of this rear casing member 53 at the peripheral section thereof via bolts 15i, and a support base 55 connected to the lower section of the rear casing member 53 via bolts 15j.

[0040] In addition, the rear casing member 53 and the rear end plate 54 constitute a cylindrical can 2C having a bottom, and the inside of this can 2C serves as a rotor chamber 60. At the central section inside the rotor chamber 60, an impeller shaft 5C journaled on the partition plate 52 and the rear e...

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Abstract

In a magnet pump in which a cylinder 4A integrated with a drive shaft 3A and provided with a drive magnet M1 on the inner circumferential side thereof is disposed outside a cylindrical can 2A having a bottom and secured to a pump casing 1A, and a rotor 6A concentrically fitted over an impeller shaft 5A and provided with a driven magnet M2 on the outer circumferential side thereof is disposed inside the can 2A, and the rotor 6A rotates integrally with an impeller 7A around the impeller shaft 5A as the drive shaft 3A rotates, by virtue of a magnetic attraction force generated between the drive magnet M1 and the driven magnet M2, wherein the sliding contact members of the pump, a bushing 81, a sleeve 82 and a thrust ring 83 interposed in each of the bearing sections 8fA and 8rA for the impeller shaft 5A, are made of ceramic or cemented carbide and have a diamond-like carbon film.

Description

FIELD OF THE INVENTION [0001] The invention pertains to the field of canned pumps, and in particular to canned magnetic pumps. BACKGROUND OF THE INVENTION AND STATEMENT OF RELATED ART [0002] The present invention relates to a canned pump, such as a canned magnetic coupling type magnet pump and a canned motor pump, wherein an impeller shaft and the bearing sections thereof are disposed inside a can, and a rotor fitted over the impeller shaft rotates integrally with an impeller by virtue of the magnetic action between the inside and outside of the can. [0003] Generally speaking, in a canned magnetic coupling type magnet pump, a cylinder integrated with a drive shaft and having a drive magnet on the inner circumferential side thereof is disposed outside a cylindrical can having a bottom, the inside of the can being communicated with the inside of the pump, and a rotor concentrically fitted over an impeller shaft and having a driven magnet on the outer circumferential side thereof is di...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B17/00
CPCF04D13/026F04D29/0465
Inventor HORIUCHI, KIYOTAKAINOUE, MITSUGINISHIMURA, YOSHIMI
Owner KURITA SEISAKUSHO
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