阅读说明：本技术 一种多级离心泵导叶防转结构 (Multistage centrifugal pump stator rotation-proof structure ) 是由 童哲铭 辛佳格 童水光 于 2018-09-17 设计创作，主要内容包括：本发明公开了一种多级离心泵导叶防转结构,包括进水段,多级导叶,中段,出水段,柱销,其中,进水段、导叶、中段依次通过柱销相连接,每级导叶包括前盖板、正导叶、后盖板和反导叶,依次焊接而成；每级导叶的前盖板外径增大至与中段、进水段、出水段外径相同；进水段、出水段与导叶前盖板边缘接触处分别有柱销孔；中段与前一级导叶前盖板内侧接触面设有和进水段数量相同的销孔,中段与下一级导叶前盖板外侧接触面出水段数量相同的柱销孔；每级导叶的前盖板边沿处设有和进水段、出水段数量相同的柱销通孔。该防转结构能够提高导叶的稳定性能,使其牢固固定,延长多级离心泵的使用寿命。(The invention discloses an anti-rotation structure for guide vanes of a multistage centrifugal pump, which comprises a water inlet section, multistage guide vanes, a middle section, a water outlet section and a pin, wherein the water inlet section, the guide vanes and the middle section are sequentially connected through the pin; the outer diameter of the front cover plate of each stage of guide vane is increased to be the same as the outer diameters of the middle section, the water inlet section and the water outlet section; the contact parts of the water inlet section and the water outlet section with the edge of the front cover plate of the guide vane are respectively provided with a pin hole; the contact surface of the middle section and the inner side of the front cover plate of the front guide vane of the previous stage is provided with pin holes with the same number as that of water inlet sections, and the contact surface of the middle section and the outer side of the front cover plate of the guide vane of the next stage is provided with pin holes with the same number as that of water outlet sections; the edge of the front cover plate of each stage of guide vane is provided with pin through holes with the same quantity as the water inlet section and the water outlet section. The anti-rotation structure can improve the stability of the guide vane, so that the guide vane is firmly fixed, and the service life of the multistage centrifugal pump is prolonged.)

1. A multistage centrifugal pump guide vane rotation-proof structure is characterized by comprising a water inlet section, a multistage guide vane, a middle section, a water outlet section and a pin, wherein the water inlet section, the guide vane and the middle section are sequentially connected through the pin, or the middle section, the guide vane and the water inlet section are sequentially connected through the pin, each stage of guide vane comprises a front cover plate, a front guide vane, a rear cover plate and a reverse guide vane, and the multistage centrifugal pump guide vane rotation-proof structure is formed by sequentially;

the outer diameter of the front cover plate of each stage of guide vane is increased to be the same as the outer diameters of the middle section, the water inlet section and the water outlet section; the contact parts of the water inlet section and the water outlet section with the edge of the front cover plate of the guide vane are respectively provided with a pin hole;

the contact surface of the middle section and the inner side of the front cover plate of the front guide vane of the previous stage is provided with pin holes with the same number as that of water inlet sections, and the contact surface of the middle section and the outer side of the front cover plate of the guide vane of the next stage is provided with pin holes with the same number as that of water outlet sections;

the edge of the front cover plate of each stage of guide vane is provided with pin through holes with the same quantity as the water inlet section and the water outlet section.

2. The anti-rotation structure of the guide vane of the multistage centrifugal pump as claimed in claim 1, wherein the length of the pin is smaller than the depth of a pin hole formed by the water inlet section, the front cover plate of the guide vane and the middle section;

or the length of the pin is less than the depth of a pin hole formed by the middle section, the guide vane front cover plate and the next-stage middle section together;

or the length of the pin is less than the depth of a pin hole formed by the middle section, the guide vane front cover plate and the water outlet section together.

3. The anti-rotation structure of a multistage centrifugal pump guide vane according to claim 1, wherein the pin is identical in shape and in transition fit with each corresponding pin hole.

4. The anti-rotation structure of a multistage centrifugal pump guide vane according to claim 1, wherein the pin has a uniform upper and lower diameter.

5. The anti-rotation structure of the guide vane of the multistage centrifugal pump as claimed in claim 1, wherein the number of the pins and the number of the pin holes on the water inlet section, the water outlet section, the guide vane of each stage and the middle section are 2-3.

6. The anti-rotation structure of a guide vane of a multistage centrifugal pump according to claim 1, wherein the pins are uniformly distributed on the circumferential surface.

Technical Field

The invention relates to a guide vane anti-rotation structure of a multistage centrifugal pump.

Background

Because of the reasons of uneven force application, frequent starting and closing of the centrifugal pump and the like when each stage of guide vane in the centrifugal pump is assembled, the guide vane repeatedly bears the torsional moment generated by water flow impact with large force to cause the guide vane to rotate, the guide vane is possibly deformed and damaged, the multistage centrifugal pump can also break down during operation, and safety accidents are easily caused while normal use is influenced.

At present, there are two main measures taken for preventing guide vane rotation: (1) the method cannot bear larger torque and is not firm in mounting by punching a large plane where the guide vane is contacted with the middle section or the water inlet section and inserting a set screw or a pin; (2) the guide vane is fixed with the front and the rear middle sections in a matched manner by increasing the outer diameter of the guide vane, the method does not effectively position the direction of the guide vane rotating around the shaft, only plays a role in compressing, and the guide vane can still rotate if parts are loosened after the guide vane is used for a certain time.

Disclosure of Invention

The invention aims to solve the technical problem of providing a guide vane anti-rotation structure of a multistage centrifugal pump.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a guide vane anti-rotation structure of a multistage centrifugal pump comprises a water inlet section, multistage guide vanes, a middle section, a water outlet section and a pin, wherein the water inlet section, the guide vanes and the middle section are sequentially connected through the pin, or the middle section, the guide vanes and the water inlet section are sequentially connected through the pin, each stage of guide vanes comprise a front cover plate, a front guide vane, a rear cover plate and a back guide vane and are sequentially welded;

the outer diameter of the front cover plate of each stage of guide vane is increased to be the same as the outer diameters of the middle section, the water inlet section and the water outlet section; the contact parts of the water inlet section and the water outlet section with the edge of the front cover plate of the guide vane are respectively provided with a pin hole;

the contact surface of the middle section and the inner side of the front cover plate of the front guide vane of the previous stage is provided with pin holes with the same number as that of water inlet sections, and the contact surface of the middle section and the outer side of the front cover plate of the guide vane of the next stage is provided with pin holes with the same number as that of water outlet sections;

the edge of the front cover plate of each stage of guide vane is provided with pin through holes with the same quantity as the water inlet section and the water outlet section.

Further, the length of the pin is smaller than the depth of a pin hole formed by the water inlet section, the guide vane front cover plate and the middle section;

or the length of the pin is less than the depth of a pin hole formed by the middle section, the guide vane front cover plate and the next-stage middle section together;

or the length of the pin is less than the depth of a pin hole formed by the middle section, the guide vane front cover plate and the water outlet section together.

Further, the pin is identical in shape and in transition fit with each corresponding pin hole.

Further, the pin has a uniform diameter from top to bottom.

Furthermore, the number of the pins and the number of the pin holes on the water inlet section, the water outlet section, each stage of guide vane and the middle section are 2-3.

Furthermore, the pins are uniformly distributed on the circumferential surface.

The invention has the beneficial effects that:

(1) the radius of the front cover plate is increased to be the same as the maximum radius of a structure connected with the front cover plate and the rear cover plate, the pin hole is arranged at the outermost edge of the front cover plate of the guide vane, the distance between the pin hole and the central shaft of the front cover plate of the guide vane is basically equal to the radius of the front cover plate, the larger the distance L between a stress point and the central shaft is, the larger the borne moment is, and compared with other structures in which the pin is arranged in the middle of the front cover plate or the rear cover plate, the pin can bear the huge moment generated when the impeller drives the guide vane when the centrifugal pump is started, so that the pin;

(2) the pin is inserted into the through hole on the guide vane and is also inserted between the front and back water inlet sections and the middle section (or the middle section and the middle section or the middle section and the water outlet section) of the guide vane, so that three devices are inserted at one time, and compared with the other mode that only the guide vane and the middle section and other two devices are inserted, the stability of the guide vane is improved, the guide vane is firmly fixed, and the service life of the multistage centrifugal pump is prolonged.

Drawings

Fig. 1 is a sectional view of a guide vane rotation preventing structure of a multistage centrifugal pump.

Fig. 2 is a schematic structural view of a guide vane.

Reference numbers in the figures: the water inlet guide vane comprises a sealing ring 1, a water inlet section 2, a pin 3, a middle section 4, a guide vane 5, an impeller 6, a water outlet section 7, a pin hole 5-1, a front cover plate 5-2, a front guide vane 5-3, a rear cover plate 5-4, a reverse guide vane 5-5, an inner side 5-2b and an outer side 5-2 a.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, and it should be noted that the detailed description is only for describing the present invention, and should not be construed as limiting the present invention.

The invention discloses a guide vane anti-rotation structure of a multistage centrifugal pump, which comprises a water inlet section 2, multistage guide vanes 5, a middle section 4, a water outlet section 7 and a pin 3, wherein the water inlet section 2, the guide vanes 5 and the middle section 4 (or the middle section, the guide vanes, the middle section or the middle section, the guide vanes and the water inlet section) are sequentially connected through the pin 3, and each stage of guide vanes 5 comprises a front cover plate 5-2, a positive guide vane 5-3, a rear cover plate 5-4 and a reverse guide vane 5-5 which are sequentially welded;

the outer diameter of a front cover plate 5-2 of each stage of guide vane 5 is increased to be the same as the outer diameters of the middle section 4, the water inlet section 2 and the water outlet section 7, wherein the outer diameters of the middle section 4, the water inlet section 2 and the water outlet section 7 are equal; the contact parts of the water inlet section 2, the water outlet section 7 and the edge of the guide vane front cover plate 5-2 are respectively provided with a pin hole; the contact surface of the middle section 4 and the inner side 5-2b of the front cover plate of the guide vane of the previous stage is provided with column pin holes with the same number as that of the water inlet section 2, and the contact surface of the middle section 4 and the outer side 5-2a of the front cover plate of the guide vane of the next stage is provided with column pin holes with the same number as that of the water outlet section 7; the edge of the front cover plate 5-2 of each stage of guide vane 5 is provided with pin through holes with the same number as the water inlet section 2 and the water outlet section 7.

As a preferable mode, the length of the pin 3 is smaller than the depth of a pin hole 5-1 formed by the water inlet section 2, the guide vane front cover plate 5-2 and the middle section 4, so that over-positioning is prevented.

As a preferable mode, the length of the pin 3 is smaller than the depth of a pin hole 5-1 formed by the middle section 4, the front cover plate 5-2 of the guide vane 5 and the next-stage middle section 4 together.

As a preferable mode, the length of the pin 3 is smaller than the depth of a pin hole 5-1 formed by the middle section 4, the guide vane front cover plate 5-2 and the water outlet section 7.

Preferably, the pin 3 is identical in shape and transition fit with the corresponding pin hole 5-1.

Preferably, the pins 3 are of uniform vertical diameter rather than tapered pins, thereby ensuring full insertion into the pin holes and pin through holes.

As a preferred mode, the number of the pins 3 is 2-3, and the number of the pin holes 5-1 on the water inlet section 2, the water outlet section 7, the guide vane 5 of each stage and the middle section 4 is 2-3.

Preferably, the pins 3 are evenly distributed over the circumference.

During assembly, one end of the pin 3 is inserted into pin holes of the water inlet section 2 (or the front-stage middle section 4) and the guide vane front cover plate 5-2, and then the next-stage middle section 4 (or the water outlet section 7) is placed, so that the other end of the pin 3 is pushed into the pin holes 5-1 of the next-stage middle section 4 (or the water outlet section 7), and each stage of guide vane is fixed and prevented from rotating.

Increase the front shroud radius to the biggest radius the same with the structure that links around, set up the pinhole in stator front shroud outermost edge department, its distance with stator front shroud center pin is equal to the front shroud radius basically, according to formula M = FL, M is moment, F is power, L is the distance of atress point and center pin, L is big more, the moment of bearing also can be big more, compare with other structures that set up the pintle in front shroud or back shroud middle part, the huge moment that the impeller drove the stator and produced when this pintle more can bear the centrifugal pump start, make the pintle difficult fracture.