CN2129349Y - Fluid-sealing type centrifugal pump - Google Patents

Abstract

Disclosed is a centrifugal pump, comprising a motor, an impeller component, a principle axis which connects the motor with the impeller component and a sealing device. One side of the shell body of the sealing device extends outwards to connect with the impeller component, and a sealing ring is arranged between the extending part and the principle axis. The other side of the shell body of the sealing device is connected with the motor. The middle of the shell body of the sealing device is a cavity body which is filled with paste-type sealing liquid with high-viscidity and non-dissolving medium. The top of the cavity body is provided with a small hole, and the both sides of the cavity body where the principle axis gets across are provided with bearings. The fluid-sealing type centrifugal pump has the advantages of good sealing performance, anti-abrasion, anti-vibration, anti-impact, low energy consumption, convenient maintenance and usage and low cost.

Description

Fluid-sealing type centrifugal pump

The utility model relates to a kind of centrifugal pump, particularly a kind of centrifugal pump that adopts fluid to seal.

Existing centrifugal pump seal form mainly contains two kinds on the market, and a kind of is bedding and padding letter formula, and another kind is a Mechanical Sealed Type, but these two kinds of seal form all have shortcoming.

Referring to Fig. 2, be a kind of bedding and padding letter formula centrifugal pump, this centrifugal pump comprises that a motor 1, a wheel member 2 and connect the main shaft 3 of motor 1 and wheel member 2, and a seal arrangement 4.The sealing device comprises the bedding and padding letter 5 of being located at wheel member 2 inboards, the bedding and padding letter is built-in with the bedding and padding 6 that are made of asbestos yarn or asbestos basin root and so on, be provided with the gland 8 that is connected with bedding and padding letter 5 by screw 7 then in the outside of bedding and padding 6, gland 8 compresses bedding and padding 6 by tightening of screw 7, thereby prevents to leak.Can increase frictional force but compress bedding and padding, thereby increase the power consumption of motor; In addition, if impacting force control is improper, as press to such an extent that tightly still can produce leakage inadequately; And bedding and padding are worn very soon in the running up of axle, and can produce the gap thus and cause leakage.

Referring to Fig. 3, be a kind of Mechanical Sealed Type centrifugal pump.This centrifugal pump structure is to similar shown in Fig. 2, difference is that its seal arrangement comprises that one is close to the flange 9 that wheel member 2 is provided with, one places the spring 10 of flange 9 boss inside, the outside of spring 10 is near a stationary ring 11 that is enclosed within on the main shaft 3, the outside of stationary ring 11 near one with main shaft 3 friction tight rotating rings 12.This seal form makes axial leakage become radial leakage, and it is by spring 10 stationary ring 11 to be compressed, and makes stationary ring 11 be close to rotating ring 12, thereby reduces the gap, reduces and leaks.But this mode can not definitely prevent to leak, because run up the generation wearing and tearing, influences the sealing of dynamic and static interannular; And because the high-abrasive material quiet, that rotating ring must adopt high hardness, and the precision height, so cost is very high; Maintenance difficult in addition; The between centers friction also can increase energy consumption in addition.

The purpose of this utility model will overcome exactly that centrifugal pump seals insecure shortcoming in the prior art, adopts the mode of fluid-tight to come centrifugal pump is sealed.

The purpose of this utility model realizes by following design:

A kind of centrifugal pump, comprise that a motor, a wheel member are connected the main shaft and a seal arrangement of described motor and wheel member with one, one epitaxial lateral overgrowth of the housing of described seal arrangement is stretched with described wheel member and is connected, this stretches out and is provided with seal ring between part and the main shaft, the opposite side of the housing of described seal arrangement is connected with described motor, the middle part of the housing of described seal arrangement is the cavity that is full of high viscosity, is insoluble to the pasty state seal fluid of medium, an aperture is offered in described cavity top, and the both sides main shaft of described cavity is by locating to be equipped with the sealed against leakage bearing.

Centrifugal pump of the present utility model adopts the fluid type sealing, broken the seal form in the centrifugal pump in the past, and its advantage is: good seal performance; Not easy to wear; The fluid bedding and padding can keep viscosity, closely are attached on the junction plane of axle and seal chamber, turn round vibration resistance, shock-resistant with pump shaft; It is little that fluid-tight produces frictional force, so can cut down the consumption of energy; When finding the pump seepage, only need add the fluid bedding and padding, and not need to dismantle any parts in the pump, so easy to maintenance; Simple in structure, easy to use, cost is low.

With reference to the accompanying drawings, the structure characteristic to most preferred embodiment of the present utility model is described further:

Fig. 1 is the structural representation of a kind of fluid-tight formula centrifugal pump of the present utility model;

Fig. 2 is the structural representation of the centrifugal pump of employing bedding and padding letter formula sealing;

Fig. 3 is the structural representation of the centrifugal pump of employing mechanical sealing.

Referring to Fig. 1, centrifugal pump of the present utility model comprises that a motor 1, a wheel member 2 are connected the main shaft 3 of motor 1 and wheel member 2 with one, an and seal arrangement 4, one epitaxial lateral overgrowth of the housing of sealing device 4 is stretched with wheel member 2 and is connected, this stretches out and is provided with seal ring 14 between part 13 and the main shaft 3, the opposite side of the housing of seal arrangement 4 is connected with motor 1, the middle part of the housing of seal arrangement 4 is the cavity 15 that is full of high viscosity, is insoluble to the pasty state liquid that transports medium, and the liquid in this cavity is effectively on the inwall attached to main shaft 3 and cavity 15.Because its viscosity height can involve rotation along with main shaft 3, stirs in cup as the egg and rotates existence very close to each other.Simultaneously can produce a less centrifugal force, offset the pressure difference of intake section, add the prevention of the viscosity and the denseness of seal fluid, medium just can not spill by seal chamber 15, prevents the purpose of leaking so can reach.This seal fluid can be prepared according to the different media that transports, for example be applicable to that acid, alkali, water are that the seal fluid prescription of medium is: (prescription in the 100ml amount of preparation comes) 18～22 gram polyisobutylene (is the best with 20 grams), 3～7 gram fluorine indenes and indene resin (is the best with 5 grams), 13～17 gram calcium carbonate (is the best with 15 grams), 2～6 gram white carbons (is the best with 4 grams), 2～6 gram gasoline (is the best with 4 grams).In addition, sealing device 4 comprises that also one is positioned at the aperture 16 of cavity 15 tops, use for injecting seal fluid, the both sides main shaft 3 of cavity 15 is by locating to be equipped with sealed against leakage bearing 17, this bearing is preferably the teflon bearing, and it belongs to oilless bearing, and wear-resisting property is good, energy and main shaft 3 keep minimum clearances, spill in cavity 15 to prevent seal fluid.

Claims (4)

1, a kind of centrifugal pump, comprise a motor, one wheel member is connected the main shaft and a seal arrangement of described motor and wheel member with one, it is characterized in that, one epitaxial lateral overgrowth of described seal arrangement housing is stretched with described wheel member and is connected, this stretches out and is provided with seal ring between part and the main shaft, the opposite side of the housing of described seal arrangement is connected with described motor, the middle part of the housing of described seal arrangement is one to be full of high viscosity, be insoluble to the cavity of the pasty state seal fluid that transports medium, an aperture is offered in described cavity top, and the both sides main shaft of described cavity is by locating to be equipped with the sealed against leakage bearing.

2, centrifugal pump as claimed in claim 1, it is characterized in that, the high viscosity of being held in the cavity of described seal arrangement, the pasty state seal fluid that is insoluble to medium comprise that (prescription in the 100ml amount of preparation comes) has 18～22 gram polyisobutylene, 3～7 gram fluorine indenes and indene resins, 13～17 gram calcium carbonate, 2～6 gram white carbons, 2～6 gram gasoline.

3, centrifugal pump as claimed in claim 2 is characterized in that, described pasty state liquid comes in the prescription of 100ml amount of preparation, comprises 20 gram polyisobutylene, 5 gram fluorine indenes and indene resins, 15 gram calcium carbonate, 4 gram white carbons, 4 gram gasoline.

As claim 1 or 2 or 3 described centrifugal pumps, it is characterized in that 4, the described cavity both sides main shaft that is located at is the teflon bearing by the sealed against leakage bearing of locating.

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