CN2660187Y - Low speed ratio centrifugal pump - Google Patents

Abstract

The utility model relates to a low-speed centrifugal pump in the art of centrifugal pump technology, characterized in that: the included angle between a main axial line and a radial line of the corresponding pump of an impeller channel and an impeller is less than 90 degrees in a radial inclined flowing structure; front and rear cover plates on the impeller are plum blossom shape; and the axial surface of the pump is the same with the axial surface of the mixed pump. The utility model, with the advantages of high efficiency, low cavitation, good axial balance and stable operation, is a replacement product of the existing low-speed centrifugal pump with strong practicality and significant economic benefits.

Description

Low specific-speed centrifugal pump

Technical field

The utility model relates to the pump technical field, relates in particular to a kind of low specific-speed centrifugal pump.

Background technique

Low specific-speed centrifugal pump comprises the pump housing, impeller, pump cover, rotary main shaft, critical piece such as seal arrangement and suspension constitutes, at present domestic low specific-speed centrifugal pump adopts the radial design, be that the center line of impeller channel and the corresponding site of the pump housing and the axis of rotary main shaft are vertical configuration basically, this series products is compared with external product, exist the difference of efficient, net positive suction head, and the flow margin of design is bigger, the superpressure phenomenon often appears in pump.

Summary of the invention

The purpose of this utility model is at domestic existing low specific-speed centrifugal pump above shortcomings, provide a kind of efficient, cavitation performance is good, the low specific-speed centrifugal pump of stable performance, pump is efficient, net positive suction head is low to reach, and balancing axial thrust effectively, improves the stationarity of running.

Summary of the invention

The purpose of this utility model is achieved through the following technical solutions, a kind of low specific-speed centrifugal pump, mainly comprise critical pieces such as the pump housing, impeller, pump cover, main shaft, Sealing and suspension, the radial line of the center line of impeller channel and impeller corresponding site pump housing cavity and the angle of main-shaft axis are less than 90 °, the impeller front and rear cover plate is plum blossom shape, and pump housing axial plane is identical with mixed flow pump pump housing axial plane structure.

The utility model is by being designed to blade wheel structure radially diagonal flow type and taking above-mentioned other technical measures, its technique effect is embodied in: 1, adopt radially diagonal flow type, it is parallel to make impeller blade import and export the limit, and the blade import is extended to suction port, to improve pump efficiency; 2, impeller front and rear cover plate radius of curvature can reach higher value, and can improve the cavitation performance of pump near equating; 3, inlet blade angle is bigger, and impeller inlet does not have blocking phenomenon, improves mercury vapour erosion performance; 4, front and rear cover plate all is designed to plum blossom shape, the pump efficiency of balancing axial thrust, and raising effectively; 5, quincunx impeller front and rear cover plate has in a disguised form strengthened impeller outlet width, can the hump phenomenon occur by curve thereby the property eliminated is logical; 6, quincunx impeller front and rear cover plate has alleviated the weight of impeller, has improved the stationarity of pump operation; 7, the impeller axial plane is designed to diagonal flow type, has increased the active length of blade, so can strengthen pump duty under identical impeller diameter, improves pumping head.

Blade Design in the impeller is cylindrical, meets low specific-speed centrifugal pump Blade Design standard, to simplify the blade manufacturing process and to improve pump efficiency.

Description of drawings

Fig. 1 is the utility model sectional structure schematic representation;

Fig. 2 is an impeller left view in the utility model;

Fig. 3 is an impeller right elevation in the utility model;

Fig. 4 is the utility model middle pump body axial plane figure.

Among the figure, the 1st, the pump housing, the 2nd, impeller ring, the 3rd, impeller, the 4th, impeller nut, the 5th, casing wear ring, the 6th, pump cover, the 7th, rotary main shaft, the 8th, mechanical seal, the 9th, machine sealed cover, the 10th, suspension.

Embodiment

The utility model comprises that critical pieces such as the pump housing 1, impeller ring 2, impeller 3, impeller nut 4, casing wear ring 5, pump cover 6, rotary main shaft 7, mechanical seal 8, machine sealed cover 9 and suspension 10 constitute, impeller 3 axial planes are radially diagonal flow type, be impeller 3 runners and impeller 3 respective cylinder cavity portions radially with the axis angle of main shaft 7 less than 90 °, the front and rear cover plate of impeller 3 adopts the plum blossom shape structure, and the axial end structure of pump housing runner is same as the runner axial end structure of mixed flow pump.

Claims (2)

1, a kind of low specific-speed centrifugal pump, mainly comprise critical pieces such as the pump housing, impeller, pump cover, main shaft, Sealing and suspension, the angle that it is characterized in that the radial line of the center line of impeller channel and impeller corresponding site pump housing cavity and main-shaft axis is less than 90 °, the impeller front and rear cover plate is plum blossom shape, and pump housing axial plane is identical with mixed flow pump pump housing axial plane structure.

2, low specific-speed centrifugal pump according to claim 1 is characterized in that the blade in the impeller is cylindrical.

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