CN202851441U

CN202851441U - Centrifugal pump

Info

Publication number: CN202851441U
Application number: CN 201220395280
Authority: CN
Inventors: 沈青; 张云亮; 郑生宏; 关皓月
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-10
Filing date: 2012-08-10
Publication date: 2013-04-03
Anticipated expiration: 2022-08-10

Abstract

The utility model provides a centrifugal pump and aims at solving the problems of abrasion of a shaft, consumption of a shaft sealing element, and the like in the prior art. The centrifugal pump comprises a transmission shaft, an impeller and the shaft sealing element. The transmission shaft drives the impeller to rotate. Vane groups are symmetrically arranged on the obverse side and the reverse side of the impeller with the center line of the thickness of the impeller as the center. The vane groups are in the same structure. A bypass pipeline is arranged on a shell body of the pump. The bypass pipeline is arranged inside a pump body and communicated to the other side of the impeller from one side of a liquid inlet of the impeller. In the operating process of the centrifugal pump, pressure exerted on the obverse side and the reverse side of the impeller is basically identical, and consequently the centrifugal pump effectively reduces liquid phase working pressure in the shaft end direction of the impeller, improves working conditions of the sealing element of a impeller shaft, reduces abrasion of the impeller shaft and the sealing element, decreases power wear, and is simple and convenient to install, economic and practical.

Description

A kind of centrifugal pump

Technical field

The utility model relates to a kind of pump, is specifically related to a kind of centrifugal pump.

Background technique

At present, what the shaft sealing of the centrifugal infusion pump of prior art shaft drive was adopted is mechanical seal, impeller blade when rotation liquid under the effect of centrifugal force is discharged into liquid outlet, the liquid that enters liquid outlet has certain pressure, because impeller blade is arranged on the liquid-inlet direction, and the impeller back side is a plane perpendicular to axle, because the pump inner chamber body is a continuous space, so this pressure can be sent in the impeller back side axle one end cavity synchronously, and act on the shaft seal assembly, the pressure that acts on the shaft seal equates with the pressure of liquid port, the input power of pump is larger, lift is higher, this pressure is just larger, the working condition of shaft seal is just more abominable, scurry out between centers in order to prevent liquid, Sealing will correspondingly strengthen the pressure of axle, so, the wearing and tearing between axle and the Sealing have been strengthened on the one hand, strengthened on the other hand the power loss of pump, if working medium is multi-phase fluid (such as mud), solid phase particles wherein can enter under the effect of pressure between axle and the Sealing, and this has just more aggravated the consumption of axle wearing and tearing and shaft seal.

Summary of the invention

For solving the problems such as consumption of the wearing and tearing of prior art axis and shaft seal, the utility model provides a kind of centrifugal pump.

A kind of centrifugal pump comprises transmission shaft, impeller and shaft seal, and the transmission shaft impeller is rotated, and it is characterized in that: be symmetrically arranged with vane group at the impeller front and back centered by impeller mid-depth line, and structure is identical; And, be provided with by-pass line at the housing of pump, and be communicated to the opposite side of impeller from liquid entering hole one side of impeller, namely be communicated to the back side of impeller from the front of impeller.

Further, impeller just, the vane group at the back side is by being welded to connect on impeller.

Further, impeller just, the vane group at the back side is provided with respectively 2 blades at least.

Further, the by-pass line sectional area is less than the liquid entering hole sectional area.

The beneficial effects of the utility model are: impeller is just, the pressure at the back side is basic identical, effectively reduce impeller shaft to working pressure, improve impeller shaft sealing part works state, reduce the wearing and tearing of impeller shaft and Sealing, reduce power and wear and tear.Easy to use rapid, easy to maintenance, simple installation, economical and practical.

Description of drawings

Fig. 1 is the utility model centrifugal pump internal structure schematic diagram.

Embodiment

In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

Fig. 1 is the utility model centrifugal pump internal structure schematic diagram, and among the figure, 1 is impeller positive blade group, and 2 is impeller back side vane group, and 3 is by-pass line, and 4 is impeller, and 5 is transmission shaft, and 6 is shaft seal.As seen from the figure, the utility model centrifugal pump comprises transmission shaft 5, impeller 4 and shaft seal 6, transmission shaft 5 impeller 4 are rotated, and are respectively arranged with impeller positive blade group 1 and impeller back side vane group 2 in impeller 4 front and backs symmetry centered by impeller 4 mid-depth lines; Housing at pump arranges a by-pass line 3, and be communicated to the opposite side of impeller 4 from liquid entering hole one side of impeller 4, by-pass line 3 sectional areas are less than the liquid entering hole sectional area, during transmission shaft 5 rotation, the blade on impeller plate both sides rotates simultaneously, liquid in the pump cavity is discharged into pump housing liquid outlet under the effect of centrifugal force, impeller 4 just, back side vane group is respectively arranged with 2 blades, namely is communicated to the back side of impeller from the front of impeller.The leaf-group structure on impeller two sides is just the same, both sides produce suction simultaneously when impeller 4 rotation, the impeller positive blade group 1 of liquid entering hole one side with the liquid of liquid entering hole discharged to liquid outlet and form lift, and the attraction force that the impeller back side vane group 2 of impeller 4 opposite sides produces with the liquid of by-pass line 3 discharged to liquid outlet and form lift.Impeller 4 just, the vane group at the back side is by being welded to connect on impeller 4, because the blade on impeller plate both sides is just the same, the centrifugal force that produces also is just the same, therefore when work, the impeller plate just, the pressure at the back side is basic identical, effectively reduce impeller shaft to working pressure, improve impeller shaft Sealing 6 working staties.Because by-pass line 3 sectional areas are less than the liquid entering hole sectional area, therefore, the flow of the by-pass line 3 of transmission shaft 5 one end cavitys supply working medium is less than the flow of working medium entrance point, so that transmission shaft 5 one end pump cavitys are in negative pressure state, the pressure that shaft seal 6 is subject to becomes normal pressure or even negative pressure, because the suffered radial pressure of shaft seal 6 is basic identical in the operation of pump with when stopping, so just can reduce the pressure of 6 pairs of transmission shafts 5 of shaft seal, also just reduced power consumpiton, transmission shaft 5 one end pump cavitys vacuum magnitude when work can be crossed by increasing and decreasing by-pass line 3 width of blade on liquid sectional area or adjustment impeller plate both sides and regulate.

Impeller 4 positive blade groups 1 are respectively equipped with 2 blades with impeller back side vane group 2 at impeller 4 among the embodiment.Those of ordinary skills are after having understood embodiment of the present utility model, be easy to expect, impeller 4 positive blade groups 1 are respectively equipped with blade quantity with impeller 4 back side vane group 2 at impeller 4 and are not limited to 2 blades, 3 blades also can be set in one embodiment or 4 blades are set in another embodiment.

Claims

1. a centrifugal pump comprises transmission shaft, impeller and shaft seal, and the transmission shaft impeller is rotated, and it is characterized in that: be symmetrically arranged with vane group at the impeller front and back centered by impeller mid-depth line, and structure is identical; And, be provided with by-pass line at the housing of pump, and be communicated to the opposite side of impeller from liquid entering hole one side of impeller, namely be communicated to the back side of impeller from the front of impeller.

2. centrifugal pump according to claim 1 is characterized in that, impeller just, the vane group at the back side is by being welded to connect on impeller.

3. centrifugal pump according to claim 1 is characterized in that, impeller just, the vane group at the back side is provided with respectively 2 blades at least.

4. centrifugal pump according to claim 1 is characterized in that, the by-pass line sectional area is less than the liquid entering hole sectional area.