CN203130596U

CN203130596U - Serial inducer

Info

Publication number: CN203130596U
Application number: CN 201320141111
Authority: CN
Inventors: 韩安达; 林德生
Original assignee: 浙江天德泵业有限公司
Priority date: 2013-03-26
Filing date: 2013-03-26
Publication date: 2013-08-14

Abstract

The utility model relates to a serial inducer of a high-speed centrifugal pump. The serial inducer comprises a shaft body, a first spiral blade and a second spiral blade; the first and second spiral blades are fixedly arranged on the shaft body, the first spiral blade is smaller than the second spiral blade in liquid flow angle and the interval between the first and second spiral blades forms a buffering space. According to the serial inducer, the two groups of inducer blades with the same pitch and the different liquid flow angles are connected in series, and the buffering space is remained between the first and second spiral blades; when liquid passes the inducer, the first spiral blade can generate higher cavitation performance due to the smaller liquid flow angle, the buffering space balances the pressure in the centrifugal pump, and the second spiral blade can generate higher lift due to the larger liquid flow angle, thus meeting the energy need of the inlet of an impeller; and compared with the existing inducer, the serial inducer disclosed by the utility model has the advantages of better cavitation performance, simple structure and reduced abrasion and lowered manufacturing cost.

Description

A kind of tandem inducer

Technical field

The utility model belongs to a kind of inducer of centrifugal pump, especially relates to a kind of tandem inducer of high speed centrifugal pump.

Background technique

The cavitation performance that an inducer improves pump all will be installed in impeller front portion in the centrifugal pump.When the maximum cavitation specific speed of centrifugal pump surpasses after 4000, the inducer of existing most uniform pitch or variable pitch is all difficult obtains more satisfactory cavitation performance.In the prior art, application number: adopted in 02220360.5 the technology to couple together use before and after 2 inducers, reach the purpose that improves cavitation performance, two inducer design accuracies are like this had relatively high expectations, axially cantilever lengthens, and has improved the difficulty of part processing and the input of cost greatly.

Summary of the invention

The utility model is in order to remedy the deficiencies in the prior art, provide a kind of simple in structure, cavitation performance good, adopt the one-body molded tandem inducer of being convenient to manufacturing.

The utility model is by the following technical solutions: a kind of tandem inducer, it is characterized in that: comprise axis body, first helical blade and second helical blade, what described first helical blade and second helical blade were fixing is arranged on the axis body, the flow angle of described first helical blade is less than the flow angle of second helical blade, be provided with between first helical blade and second helical blade at interval, described interval forms buffer space.

As a kind of improvement, the axis body end of the described second helical blade place side is provided with threaded mounting hole, and described axis body can be installed in the rotating shaft of impeller by being threaded between the rotating shaft of threaded mounting hole and impeller, and integral body is packed into use in the centrifugal pump.

As a kind of improvement, the blade quantity of described first helical blade is the 2-3 sheet, and the blade quantity of described second helical blade is the 3-5 sheet.

The beneficial effects of the utility model: the uniform pitch inducer blade of two groups of different flow angles is cascaded, and reserves buffer space in the centre; When liquid process inducer, the first helical blade flow angle is less, can produce higher cavitation performance, pressure in the buffer space equilibrium centrifugation pump, the second helical blade flow angle is bigger, then can produce higher lift, thereby satisfies the energy demand of impeller inlet; Better than existing inducer cavitation performance, and simple in structure, reduce wearing and tearing, reduced manufacture cost.

Description of drawings

Fig. 1 is the utility model tandem inducer centrifugal pump structure sectional view of packing into.

Fig. 2 be the utility model tandem inducer partly cut open figure.

Embodiment

Below in conjunction with accompanying drawing specific embodiment of the utility model is elaborated.

As shown in Figure 1, 2, be the specific embodiment of the utility model tandem inducer.This tandem inducer comprises axis body 1, first helical blade 2 and second helical blade 3, first helical blade 2 and 3 fixing being arranged on the axis body 1 of second helical blade, the flow angle of first helical blade 2 is less than the flow angle of second helical blade 3, be provided with between first helical blade 2 and second helical blade 3 at interval, described interval forms buffer space 4.Axis body 1 end of second helical blade, 3 place sides is provided with threaded mounting hole, and axis body 1 can be installed in the rotating shaft of impeller by being threaded between the rotating shaft of threaded mounting hole and impeller, and integral body is packed into use in the centrifugal pump.The blade quantity of first helical blade 2 is 2, and the blade quantity of second helical blade 3 is 3.

Impeller and inducer are assembled into one and pack into and use in the centrifugal pump.At first pass through inducer when liquid enters centrifugal pump, first helical blade 2 arranges 2 blades and has less flow angle, can produce higher cavitation performance; The buffer space 4 of first helical blade 2 and second helical blade 3 plays the effect of balance pressure, prevents that the excessive performance that influences of pressure difference strengthens parts depreciation in the centrifugal pump; Second helical blade 3 arranges 4 blades and has bigger flow angle, can produce higher lift, thereby satisfies the energy demand of impeller inlet.

Claims

1. tandem inducer, it is characterized in that: comprise axis body (1), first helical blade (2) and second helical blade (3), what described first helical blade (2) and second helical blade (3) were fixing is arranged on the axis body (1), the flow angle of described first helical blade (2) is less than the flow angle of second helical blade (3), be provided with between first helical blade (2) and second helical blade (3) at interval, described interval forms buffer space (4).

2. a kind of tandem inducer according to claim 1, axis body (1) end that it is characterized in that described second helical blade (3) place side is provided with threaded mounting hole, described axis body (1) can be installed in the rotating shaft of impeller by being threaded between the rotating shaft of threaded mounting hole and impeller, and integral body is packed into use in the centrifugal pump.

3. .A kind of tandem inducer according to claim 1 and 2, the blade quantity that it is characterized in that described first helical blade (2) is the 2-3 sheet, the blade quantity of described second helical blade (3) is the 3-5 sheet.