CN113513502A

CN113513502A - Four volute chamber of self-balancing multistage pump go out water structure

Info

Publication number: CN113513502A
Application number: CN202110957021.2A
Authority: CN
Inventors: 罗优; 龚贤辉; 彭胜前
Original assignee: Changsha Canon General Pumps Co ltd
Current assignee: Changsha Canon General Pumps Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2021-10-19
Anticipated expiration: 2041-08-19
Also published as: CN113513502B

Abstract

The invention relates to a four-volute chamber water outlet structure of a self-balancing multistage pump, which comprises a pump body, wherein a main shaft is arranged in the center of the pump body, the positive impeller and the final-stage positive impeller are installed on the left side of the main shaft, the negative impeller and the final-stage negative impeller are installed on the right side of the main shaft, a water outlet section is arranged in the middle of the pump body, four volute chambers are arranged on the water outlet section, the positive impeller and the final-stage positive impeller are symmetrically arranged in two volute chambers on the left side of the water outlet section, the final-stage negative impeller and the negative impeller are symmetrically arranged in two volute chambers on the right side of the water outlet section, the positive guide vane is installed on the left side of the water outlet section, and the negative guide vane is installed on the right side of the water outlet section; the first vortex chamber and the third vortex chamber are both circular vortex chambers, the second vortex chamber is a spiral vortex chamber, and the fourth vortex chamber is a spiral paraboloid-shaped vortex chamber. The invention improves the efficiency of the pump, reduces the noise and prolongs the service life of the pump through the unique structural design.

Description

Four volute chamber of self-balancing multistage pump go out water structure

Technical Field

The invention relates to the technical field of multistage pumps, in particular to a four-volute chamber water outlet structure of a self-balancing multistage pump.

Background

The self-balancing multistage centrifugal pump consists of a stator part and a rotor part, wherein the stator part consists of parts such as a water inlet section, a middle section, a positive guide vane, a reverse guide vane, a water outlet section, a secondary water inlet section, a front bearing body, a rear bearing body, a transition pipe and the like, and the rotor part consists of a main shaft, a positive impeller, a reverse impeller, a shaft sleeve, a bearing retaining sleeve, a middle throttling shaft sleeve, a rear throttling shaft sleeve, a shaft coupling and the like. The prime motor drives the water pump to rotate, medium is sucked from the water inlet section, flows into the secondary water inlet section through the pressurizing of the positive impeller group, flows into the secondary water inlet section through the transition pipe, is pressurized again through the reverse impeller group, and flows out of the water outlet section, so that the medium is continuously conveyed.

The existing multistage pumps are mostly self-balancing multistage pumps and balance disc type multistage pumps, and the water outlet section of the pump is long in stage length, poor in rigidity of a main shaft and low in reliability. The vortex chambers of the existing multi-stage pump are all spiral or circular, and when high-lift high-flow water flow is thrown out of the spiral vortex chambers, the problems of high water outlet resistance, uneven flow, high noise and serious cavitation exist. The existing vortex chamber shape and water outlet angle design does not completely accord with the fluid mechanics action principle, can not ensure that water flow uniformly enters a water outlet pipe, and certain loss exists in hydraulic power, especially the water flow has larger scouring resistance, larger abrasion, larger noise and larger cavitation on one section of the spiral tail part of the vortex chamber. In addition, the pump tongues of the conventional multistage pump are all in a simple triangular shape, an inclined plane shape or an arc shape, are not matched with the hydraulic action, are seriously corroded, greatly abraded, loud in noise and easy to damage, and greatly reduce the service life of the pump.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a water outlet structure of a four-vortex chamber of a self-balancing multistage pump and a design method of the four-vortex chamber.

The invention is realized by the following technical scheme:

a self-balancing multi-stage pump four-volute water outlet section comprises a main shaft, a positive impeller, a positive guide vane, a final positive impeller, a water outlet section, a throttling shaft sleeve, a final reverse impeller, a reverse guide vane, a reverse impeller and a pump body, a main shaft is arranged at the center of the pump body, a throttling shaft sleeve is arranged in the middle of the main shaft, the positive impeller and the final-stage positive impeller are arranged on the left side of the main shaft, the reverse impeller and the final-stage reverse impeller are arranged on the right side of the main shaft, a water outlet section is arranged in the middle of the pump body, the water outlet section is provided with four vortex chambers, the positive impeller and the final-stage positive impeller are symmetrically arranged in two vortex chambers on the left side of the water outlet section, the final-stage counter impeller and the counter impeller are symmetrically arranged in two vortex chambers on the right side of the water outlet section, install in the play water section left side positive stator, it installs to go out water section right side the back guide vane.

Preferably, the water outlet section is provided with four vortex chambers, namely a vortex chamber I, a vortex chamber II, a vortex chamber III and a vortex chamber IV; the first vortex chamber and the second vortex chamber are arranged on the left side of the water outlet section, a positive impeller and a positive guide vane are arranged in the first vortex chamber, a final-stage positive impeller is arranged in the second vortex chamber, a first flow guide channel is arranged in the positive guide vane, and an outlet of the positive impeller is communicated with an inlet of the final-stage positive impeller through the first flow guide channel; the third volute chamber and the fourth volute chamber are arranged on the right side of the water outlet section, a back impeller and a back guide vane are installed in the third volute chamber, a last-stage back impeller is installed in the fourth volute chamber, the back guide vane is provided with a second flow guide channel, and the outlet of the back impeller and the inlet of the last-stage back impeller are communicated through the second flow guide channel.

Preferably, the first vortex chamber and the third vortex chamber have the same shape and structure and are symmetrical in position, and the second vortex chamber and the fourth vortex chamber are symmetrical in position; the first vortex chamber and the third vortex chamber are both circular vortex chambers, and the radius R of the first vortex chamber and the third vortex chamber₁Equal, volute chamber width b₁The same is true.

Preferably, the second vortex chamber and the fourth vortex chamber are both spiral parabolic vortex chambers, and the average radius R of the second vortex chamber and the fourth vortex chamber₂The radius R of the vortex chamber is smaller than that of the first vortex chamber and the third vortex chamber₁The second vortex chamber and the second vortex chamberVolute width b of Chamber four₂The width b of the vortex chamber is less than that of the first vortex chamber and the third vortex chamber₁。

Preferably, the average radius R of the second and fourth vortex chambers₂The radius R of the vortex chamber is one of the vortex chamber I and the vortex chamber III₁0.7 to 0.8 times of the width b of the second and fourth vortex chambers₂The width b of the vortex chamber of the first vortex chamber and the third vortex chamber₁0.7 to 0.8 times of the total amount of the active ingredient.

Preferably, the shape of the spiral parabolic vortex chamber consists of a spiral line and a parabola line, and the base circle diameter D of the spiral line₁For the last-stage counter-impeller D₂1.04-1.09 times of the total volume of the spiral parabolic vortex chamber, the spiral parabolic vortex chamber is divided into eight areas in the clockwise direction by taking the center of a base circle as the center, the vortex chamber in the seven areas is in a spiral shape, the vortex chamber in one area is in a parabolic shape, and the end point of the spiral is the starting point of the parabolic shape.

Preferably, a rectangular coordinate system and a parabolic equation are established by taking the terminal point of the spiral line as the origin of coordinates, taking the direction in which the terminal point of the spiral line points to the center of the base circle as the Y axis, and taking the direction which passes through the terminal point of the spiral line, is perpendicular to the Y axis and points to the terminal point of the spiral line as the X axis, wherein the parabolic equation is X²=2Py, wherein P = (0.6-0.7) D₁，-0.6 D₁≤x≤0。

Preferably, the center of the base circle is taken as a starting point to be taken as a ray I pointing to the starting point of the spiral line, and the intersection point of the ray I and the parabola is taken as an end point I of the parabola.

Preferably, the first ray is rotated by an angle alpha in the clockwise direction to obtain a second ray, the intersection point of the second ray and the parabola is used as an end point two of the parabola, the intersection point of the second ray and the spiral line is used as a mounting position of the pump tongue, and the angle alpha is larger than or equal to 10 degrees and smaller than or equal to 25 degrees.

Preferably, the pump tongue has a parabolic shape, and the parabolic shape of the pump tongue is according to a parabolic equation x²=2P₁y is determined, wherein 3 is less than or equal to P₁Less than or equal to 8, and the value range of x is-0.08D₁≤x≤0.08D₁，D₁Is base circle diameter

The invention has the following technical effects:

the invention improves the efficiency through the matching among all components in the technical scheme, greatly shortens the length of the water outlet section, is provided with the positive impeller, the positive guide vane, the final stage positive impeller, the reverse guide vane and the final stage reverse impeller, is provided with the four-stage impeller together, shortens 2 stages compared with the self-balancing multi-stage water outlet section, and is 0.5 stage shorter than the balancing disc type multi-stage pump. The length of the main shaft is shortened, the rigidity of the rotor is improved, and the reliability of the pump is improved.

The volute chamber has the main function of collecting water flow thrown out by the impeller and converting kinetic energy of high-speed water flow into static pressure energy. In the multistage pump, the existing volute chamber is an annular volute chamber or a spiral volute chamber, the annular volute chamber is generally used as a front stage volute chamber of the spiral volute chamber, when high-speed water flows out, the volute chamber with the shape structure has larger impact and scouring action on one section of outlet side edge of the spiral tail part of the volute chamber, cavitation and larger noise are easily caused, and certain resistance and pressure loss exist when high-speed fluid enters the water outlet pipe. The invention changes the shape of the last water outlet area of the volute into a parabola shape, creatively establishes a rectangular coordinate system by taking the end point of a spiral line as the original point, searches out the optimal parameters of the parabola through a large number of experiments, seamlessly butts the start point of the parabola to the end point of the spiral line, and applies the property of the parabola to ensure that the high-speed centrifugal water flow thrown out by an impeller in the volute more conforms to the mechanical property of parabolic fluid.

The pump tongue is the connection part of the volute chamber and the water outlet and is shaped like a tongue. When the water flow at the outlet of the channel of the rotating impeller sweeps around the pump tongue, the latter divides them into two: most of the water flows to the outlet of the multi-stage pump along the channel, and a small part of the water flows back to the volute chamber through the gap between the pump tongue and the impeller, and returns to the pump tongue to participate in new flow distribution after rotating for a circle along with the impeller in the volute chamber. The pump tongue is used as a boundary, one side of the pump tongue is a low-pressure area, the other side of the pump tongue is a high-pressure area, and the water flow in the high-pressure area is converted into kinetic energy through the volute outlet. The shape design of the pump tongue is related to the noise size, stability, cavitation and service life of the pump. The existing pump tongue is triangular, inclined plane, circular arc and the like, the shape of the pump tongue is not matched with the hydraulic action, the pump tongue is serious in cavitation erosion, large in abrasion and large in noise, and is easy to damage, and the service life of the pump is greatly shortened. The pump tongue is in a parabolic shape, and the two sides of the pump tongue adopt symmetrical parabolas, so that the pump tongue can better adapt to the fluid mechanical property, reduce the impact of high-speed and high-pressure fluid on the tongue tip of the pump tongue, greatly reduce the cavitation and scouring action, reduce the noise during the operation of the pump, increase the stability of the pump, avoid the occurrence of the pump vibration phenomenon, and prolong the service life of the pump.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of a volute chamber I or volute chamber III.

FIG. 3 is a schematic structural diagram of a second scroll chamber or a fourth scroll chamber.

FIG. 4 is a schematic view of the spiral line of the second volute chamber.

FIG. 5 is a schematic view of a parabola of the second volute chamber.

Fig. 6 is a first schematic diagram of a parabolic end point determination method.

Fig. 7 is a second schematic diagram of the parabolic end point determination method.

Fig. 8 is a third schematic diagram of a parabolic end-point determination method.

Fig. 9 is a parabolic schematic view of the pump tongue.

FIG. 10 is a schematic view of a parabolic pump tongue and a spiral parabolic vortex chamber II.

In the drawings: 1-main shaft, 2-positive impeller, 3-positive guide vane, 4-last positive impeller, 5-water outlet section, 6-throttling shaft sleeve, 7-last negative impeller, 8-negative guide vane, 9-negative impeller, 10-pump body, 11-volute chamber one, 12-volute chamber two, 13-volute chamber three, 14-volute chamber four, 15-base circle, 16-spiral line, 17-parabola line, 18-pump tongue, 19-parabola line starting point, 20-parabola line terminal point, 21-first region, 22-second region, 23-third region, 24-fourth region, 25-fifth region, 26-sixth region, 27-seventh region, 28-eighth region, 29-water outlet pipe.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; the descriptions of the positions of the front, middle, rear, upper, middle, lower, left, right, two sides, the ends, the head, etc. in the embodiments are only for convenience of illustration and are not to be construed as limitations and limitations on the actual positions of the present invention, and it will be understood by those skilled in the art that some well-known structures and technical descriptions in the embodiments may be omitted.

As shown in figure 1, the invention relates to a four-volute chamber water outlet structure of a self-balancing multi-stage pump, which comprises a main shaft 1, a positive impeller 2, a positive guide vane 3, a final positive impeller 4, a water outlet section 5, a throttling shaft sleeve 6, a final reverse impeller 7, a reverse guide vane 8, a reverse impeller 9 and a pump body 10, wherein the main shaft 1 is arranged at the center of the pump body 10, a throttle shaft sleeve 6 is arranged in the middle of the main shaft 1, a positive impeller 2 and a final-stage positive impeller 4 are arranged on the left side of the main shaft 1, a counter impeller 9 and a final-stage counter impeller 7 are arranged on the right side of the main shaft 1, a water outlet section 5 is arranged in the middle of the pump body 10, go out water section 5 and be equipped with four vortex rooms, positive impeller 2 and the positive impeller 4 symmetrical arrangement of last stage are in two vortex rooms on 5 left sides of play water section, and the negative impeller 7 of last stage and the negative impeller 9 symmetrical arrangement of last stage are in two vortex rooms on 5 right sides of play water section, go out water section 5 left sides and install positive stator 3, go out water section 5 right sides and install negative stator 8.

The water outlet section 5 is provided with four vortex chambers, namely a vortex chamber I11, a vortex chamber II 12, a vortex chamber III 13 and a vortex chamber IV 14; the first vortex chamber 11 and the second vortex chamber 12 are arranged on the left side of the water outlet section 5, a positive impeller 2 and a positive guide vane 3 are installed in the first vortex chamber 11, a final-stage positive impeller 4 is installed in the second vortex chamber 12, a first flow guide channel is arranged in the positive guide vane 3, and the first flow guide channel enables an outlet of the positive impeller 2 to be communicated with an inlet of the final-stage positive impeller 4; the third volute chamber 13 and the fourth volute chamber 14 are arranged on the right side of the water outlet section 5, a counter-impeller 9 and a counter-guide vane 8 are installed in the third volute chamber 13, a final-stage counter-impeller 7 is installed in the fourth volute chamber 14, the counter-guide vane 8 is provided with a second flow guide channel, and the second flow guide channel is communicated with an outlet of the counter-impeller 9 and an inlet of the final-stage counter-impeller 7. Water flow is centrifugally thrown out at a high speed from the positive impeller 2 of the first volute chamber 11, enters the final positive impeller 4 of the second volute chamber 12 through the first guide channel, enters the reverse impeller 9 of the third volute chamber 13 through the final positive impeller 4, is centrifuged at a high speed again through the reverse impeller 9, enters the final reverse impeller 7 of the fourth volute chamber 14 through the second guide channel, is centrifuged at a high speed through the final reverse impeller 7, and is pumped out from the water outlet pipe 29.

As shown in fig. 1 and 2, the first scroll chamber 11 and the third scroll chamber 13 have the same shape and structure and are symmetrical in position, and the second scroll chamber 12 and the fourth scroll chamber 14 are symmetrical in position. The first vortex chamber 11 and the third vortex chamber 13 are both circular vortex chambers, and the vortex chamber radius R of the first vortex chamber 11 and the third vortex chamber 13₁Equal, volute chamber width b₁The same is true. Wherein R is₁=0.5 x (radius of positive impeller + height of upper end of positive guide vane) + 5-10 mm, b₁And = positive impeller width + 10-30 mm.

As shown in fig. 1 and 3, the second volute chamber 12 and the fourth volute chamber 14 are each a spiral parabolic volute chamber, and the average radius R of the second volute chamber 12 and the fourth volute chamber 14₂Is smaller than the radius R of the vortex chamber I11 and the vortex chamber III 13₁The width b of the second vortex chamber 12 and the fourth vortex chamber 14₂The width b of the vortex chamber is less than that of the first vortex chamber 11 and the third vortex chamber 13₁. Preferably, the average radius R of the second volute chamber 12 and the fourth volute chamber 14₂The radius R of the vortex chamber is 11 and 13₁0.7 to 0.8 times of the total volume of the second and

fourth vortex chambers

12 and 14₂The width b of the vortex chamber is 11 and 13₁0.7 to 0.8 times of the total amount of the active ingredient. Most preferably, R₂=0.75×R₁，b₂=0.75×b₁。

As shown in fig. 3, 5 and 10, the spiral parabolic vortex chamber has an outer shape composed of a spiral line 16 and a parabola line 17. The spiral 16 is designed in a conventional manner, the design of the spiral 16 being such thatBase circle 15 diameter D₁Diameter D of the final counter-impeller 7₂1.04 to 1.09 times of (D)₁=（1.04～1.09）×D₂。

As shown in fig. 4 and 5, the spiral parabolic vortex chamber is divided into eight regions in the clockwise direction around the center of the base circle 15, and as shown in the figure, a region having an angle of 45 ° with the horizontal direction at the lower left is a first region 21, and a second region 22, a third region 23, a fourth region 24, a fifth region 25, a sixth region 26, a seventh region 27, and an eighth region 28 are sequentially provided in the clockwise direction. The vortex chamber profile of seven of the regions is a helix 16 and the vortex chamber profile of the eighth region 28 is a parabola 17.

The point of intersection of the straight line passing through the center of the base circle 15 and having a slope of 1 and the lower left of the base circle 15 is taken as the starting point of the spiral line 16. That is, the point of intersection of the starting line of the first region 21 and the base circle 15 is the starting point of the spiral line 16. The spiral line 16 sequentially passes through a first region 21, a third region 23, a fourth region 24, a fifth region 25, a sixth region 26 and a seventh region 27, and the intersection point of the end line of the spiral line 16 and the seventh region 27 is used as the end point of the spiral line 16. I.e. the intersection of said spiral 16 with a vertically downward ray through the centre of the base circle 15, is taken as the end point of the spiral 16.

As shown in fig. 5, (1) a rectangular coordinate system of a parabola 17 is established: a rectangular coordinate system is established by taking the end point of the spiral line 16 as a parabola starting point 19, taking the end point of the spiral line 16 as a coordinate origin, taking the direction in which the end point of the spiral line 16 points to the center of the base circle 15 as a Y axis, and taking the direction which passes through the end point of the spiral line 16 and is perpendicular to the Y axis and points to the end point of the spiral line 16 (namely, the direction perpendicular to the Y axis and towards the right) as an X axis.

(2) Determining the equation and parameters of the parabola 17, and determining the equation of the parabola 17 as x through mathematical method and experimental verification²=2Py, with the focus of parabola 17 being (0, P/2) and the quasi-linear equation being y = -P/2, where P is (0.6-0.7) D₁，D₁Is the diameter of the base circle 15 in centimeters. Preferably, P is (0.61-0.63) D₁. Most preferably, P is 0.625D₁。

For example: diameter D of base circle 15 of spiral 16₁If =260 cm, P = (0.6-0.7) D₁= 0.6-0.7 x 260, with P = 0.625D₁For example =0.625 × 260= 162.5, the equation of the parabola 17 is x²=325y, its focal point is (0, 81.25), and its directrix is y = -81.25.

Equation x of parabola 17²The value range of x in the =2Py is as follows: x is the number of₀≤x≤0，-0.8D1≤ x₀Less than or equal to-0.5D 1. Preferably, x₀≤x≤0，-0.7D1≤ x₀Less than or equal to-0.55D 1. Most preferably, x₀taking-0.6D 1, namely x is more than or equal to-0.6D 1 and less than or equal to 0. For example: when base circle 15 diameter D₁When =260, -208 ≦ x₀≤-143，x₀X is not less than 0, wherein x₀If the preferred value is-0.6D 1= -156, the value range of x is: -156. ltoreq. x.ltoreq.0.

(3) Determining the parabola 17 by a point drawing method or a computer software automatic drawing method:

point drawing method: in the value range x of x₀Properly selecting a plurality of x values within x is less than or equal to 0, and obtaining a parabolic 17 equation x²=2Py determines the y value for different x values. For example: selecting x within the value range of x₁=0、x₂=-30、x₃=-50、x₄=-70、x₅=-100、x₆=-130、x₇= 156, according to the parabolic 17 equation x²=325y can calculate corresponding y₁=0、y₂=2.77、y₃=7.69、y₄=15.08、y₅=30.77、y₆=52、y₇=74.88, seven point coordinates on the parabola 17 are obtained, respectively being (x)₁，y₁）、（x₂，y₂）、（x₃，y₃）、（x₄，y₄）、（x₅，y₅）、（x₆，y₆）、（x₇，y₇) The seven points are connected by a smooth curve to obtain the figure of the parabola 17 needed by the eighth area of the vortex chamber. It should be noted that the more points are selected within the range of x, the more accurate the parabola 17 is. If computer software is used for automatic drawing, the parabola 17 equation x is used²The figure of the parabola 17 can be obtained quickly and accurately by inputting the value ranges of the =2Py, the relevant parameters P and x.

(4) Determining a parabolic end point:

in the parabola 17 determined according to the above design method, the parabola starting point 19 is the origin of coordinates, that is, the end point of the spiral 16 is the parabola starting point 19. The parabolic end point 20 can be determined according to the following three methods: A. the first method, as shown in FIG. 6, is based on the parabolic 17 equation x²The value range of x for =2Py is determined: because of x₀X is not less than 0, wherein x is not less than-0.8D 1₀Less than or equal to-0.5D 1, when x is₀When determined, the value range x of x₀X is less than or equal to 0 and is determined according to the parabolic 17 equation x²X can be determined by 2Py₀Corresponding to y₀The parabolic end point 20 is (x)₀，y₀）。

B. The second method comprises the following steps: as shown in fig. 7, a first ray pointing to the starting point 19 of the spiral 16 is taken from the center 19 of the base circle 15, and the intersection point of the first ray and the parabola 17 is taken as the parabola ending point 20.

C. The third method comprises the following steps: as shown in fig. 8, most preferably, the first ray pointing to the starting point of the spiral line 16 is taken from the center of the base circle 15 as the starting point 19, the second ray is obtained by rotating the first ray by an angle α clockwise, the intersection point of the second ray and the parabola 17 is taken as the parabola end point 20, and the intersection point of the second ray and the spiral line 16 is taken as the placement position of the pump tongue 18, wherein α is more than or equal to 10 degrees and less than or equal to 25 degrees. The value of alpha can be properly selected from alpha between 10 degrees and 25 degrees according to the flow rate, the lift and the like of the pump. Preferably, 15 DEG-alpha is less than or equal to 25 deg.

(5) Determining the shape of a water outlet pipe of the vortex chamber:

according to the practical application of the multi-stage pump and the existing design method, the water outlet pipe 29 can be selected to be in the shape of a straight water outlet pipe, as shown in fig. 10; or diffusion-shaped outlet pipe shape.

The invention changes the shape of the last water outlet area of the volute into the shape of a parabola 17, creatively establishes a rectangular coordinate system by taking the terminal point of a spiral line 16 as the original point, searches out the optimal parameter of the parabola 17 through a large amount of experiments, seamlessly butts the terminal point of the spiral line 16 at the starting point 19 of the parabola, and utilizes the property of the parabola 17 to ensure that the high-speed centrifugal water flow thrown out by an impeller in the volute more conforms to the mechanical property of parabolic fluid, and creatively utilizes three methods to determine the terminal point 20 position of the parabola so as to throw out the high-speed centrifugal water flow along the parabola 17 to enter a water outlet or a water outlet pipe 29, thereby greatly reducing the impact and scouring action of the high-speed water flow on the side edge of the outlet section of the volute, effectively reducing noise, avoiding cavitation, reducing the resistance and pressure loss of the high-speed water flow, and improving the efficiency and lift of the pump.

Preferably, the pump tongue 18 of the present invention also has a parabolic shape, and as shown in fig. 9 and 10, a rectangular coordinate system is made with the lowest end of the pump tongue 18 as the origin, and the parabolic shape of the pump tongue 18 is according to the parabolic equation x²=2P₁y is determined, wherein 3 is less than or equal to P₁Not more than 8, x is within the range of-0.08D 1 not less than 0.08D₁， D₁The diameter of the base circle 15. Preferably, P is₁=5, i.e. x²=10y, wherein-0.06D₁≤x≤0.06D₁. The pump tongue 18 is the junction of the volute and the water outlet and is shaped like a tongue. When the water flow at the outlet of the rotating impeller channels sweeps around the pump tongues 18, the pump tongues 18 divide them in two: most of the water flows to the outlet of the multi-stage pump along the channel, and a small part of the water flows back to the volute chamber through the gap between the pump tongue 18 and the impeller, and returns to the pump tongue 18 to participate in new flow division after rotating for a circle along with the impeller in the volute chamber. The pump tongue 18 is bounded by a low pressure region and a high pressure region, and the water flow in the high pressure region is converted into kinetic energy through the volute outlet. The shape of the pump tongue 18 is designed in relation to the efficiency, pressure, noise of the pump, in particular with regard to the size of the noise, stability, cavitation, service life of the pump. The existing pump tongues 18 are triangular, inclined plane, circular arc and the like, and the pump tongues 18 have the defects of large noise, serious cavitation, large vibration and the like in a high-pressure and large-lift multistage pump. The pump tongue 18 is in a parabolic shape, and two sides of the pump tongue 18 adopt symmetrical parabolas, so that the pump tongue can better adapt to the fluid mechanical property, reduce the impact of high-speed and high-pressure fluid on the tongue tip of the pump tongue 18, greatly reduce the cavitation and scouring action, reduce the noise of 10-20db during the operation of the pump, and increase the stability of the pumpAnd the pump is qualitative, the pump vibration phenomenon is avoided, and the service life of the pump is prolonged to 1.2-2 times of the original service life.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It should be noted that various modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and should be considered within the scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.

Claims

1. The utility model provides a four volute chamber of self-balancing multistage pump play water section which characterized in that: including main shaft, positive impeller, positive stator, the positive impeller of last stage, play water section, throttle axle sleeve, the anti-impeller of last stage, anti-stator, anti-impeller, the pump body, the center of the pump body is equipped with the main shaft, mid-mounting has the throttle axle sleeve on the main shaft, install on the main shaft on the left side positive impeller with the positive impeller of last stage, install on the main shaft on the right side anti-impeller with the anti-impeller of last stage, the middle part of the pump body is provided with out the water section, it is provided with four vortex chambers to go out the water section, positive impeller with the positive impeller symmetric arrangement of last stage is in go out two left vortex chambers of water section, the anti-impeller of last stage with anti-impeller symmetric arrangement is in two vortex chambers on water section right side, it installs on water section left side positive stator, it installs to go out water section right side anti-stator.

2. The self-balancing multistage pump four-volute chamber water outlet structure of claim 1, wherein: the water outlet section is provided with four vortex chambers, namely a vortex chamber I, a vortex chamber II, a vortex chamber III and a vortex chamber IV; the first vortex chamber and the second vortex chamber are arranged on the left side of the water outlet section, a positive impeller and a positive guide vane are arranged in the first vortex chamber, a final-stage positive impeller is arranged in the second vortex chamber, a first flow guide channel is arranged in the positive guide vane, and an outlet of the positive impeller is communicated with an inlet of the final-stage positive impeller through the first flow guide channel; the third volute chamber and the fourth volute chamber are arranged on the right side of the water outlet section, a back impeller and a back guide vane are installed in the third volute chamber, a last-stage back impeller is installed in the fourth volute chamber, the back guide vane is provided with a second flow guide channel, and the outlet of the back impeller and the inlet of the last-stage back impeller are communicated through the second flow guide channel.

3. The self-balancing multistage pump four-volute chamber water outlet structure of claim 2, wherein: the first vortex chamber and the third vortex chamber are the same in shape and structure and symmetrical in position, and the second vortex chamber and the fourth vortex chamber are symmetrical in position; the first vortex chamber and the third vortex chamber are both circular vortex chambers, and the radius R of the first vortex chamber and the third vortex chamber₁Equal, volute chamber width b₁The same is true.

4. The self-balancing multistage pump four-volute chamber water outlet structure of claim 3, wherein: the second vortex chamber and the fourth vortex chamber are both spiral parabolic vortex chambers, and the average radius R of the second vortex chamber and the fourth vortex chamber₂The radius R of the vortex chamber is smaller than that of the first vortex chamber and the third vortex chamber₁The width b of the vortex chamber of the second vortex chamber and the vortex chamber of the fourth vortex chamber₂The width b of the vortex chamber is less than that of the first vortex chamber and the third vortex chamber₁。

5. The self-balancing multistage pump four-volute chamber water outlet structure of claim 4, wherein: the average radius R of the second vortex chamber and the fourth vortex chamber₂The radius R of the vortex chamber is one of the vortex chamber I and the vortex chamber III₁0.7 to 0.8 times of the width b of the second and fourth vortex chambers₂The width b of the vortex chamber of the first vortex chamber and the third vortex chamber₁0.7 to 0.8 times of the total amount of the active ingredient.

6. The self-balancing multistage pump four-volute chamber water outlet structure of claim 4, wherein: the spiral paraboloid-shaped vortex chamber is composed of a spiral line and a parabola, and the base circle diameter D of the spiral line₁For the last-stage counter-impeller D₂1.04-1.09 times, the spiral paraboloid-shaped vortex chamber is divided into eight areas in the clockwise direction by taking the circle center of a base circle as the center, wherein the vortex chamber of the seven areas is in a spiral line shape, the vortex chamber of one area is in a parabola shape, and the spiral line is in a spiral line shapeThe end point of (a) is the start point of the parabola.

7. The self-balancing multistage pump four-volute chamber water outlet structure of claim 6, wherein: the method comprises the steps of establishing a rectangular coordinate system and a parabolic equation by taking the end point of a spiral line as the origin of coordinates, taking the direction of the end point of the spiral line pointing to the center of a base circle as a Y axis, taking the direction of the end point of the spiral line which is perpendicular to the Y axis and points to the tail end of the spiral line as an X axis, and taking the parabolic equation as X²=2Py, wherein P = (0.6-0.7) D₁，-0.6 D₁≤x≤0。

8. The self-balancing multistage pump four-volute chamber water outlet structure of claim 7, wherein: and taking the center of the base circle as a starting point as a ray I pointing to the starting point of the spiral line, and taking the intersection point of the ray I and the parabola as an end point I of the parabola.

9. The self-balancing multistage pump four-volute chamber water outlet structure of claim 7, wherein: rotating the ray I around the clockwise direction by an angle alpha to obtain a ray II, taking the intersection point of the ray II and the parabola as an end point II of the parabola, and taking the intersection point of the ray II and the spiral line as a mounting position of the pump tongue, wherein the angle alpha is more than or equal to 10 degrees and less than or equal to 25 degrees.

10. The self-balancing multistage pump four-volute chamber water outlet structure of claim 9, wherein: the pump tongue is parabolic in shape according to a parabolic equation x²=2P₁y is determined, wherein 3 is less than or equal to P₁Less than or equal to 8, and the value range of x is-0.08D₁≤x≤0.08D₁，D₁Is the base circle diameter.