CN220769718U

CN220769718U - Multistage centrifugal pump

Info

Publication number: CN220769718U
Application number: CN202322576481.8U
Authority: CN
Inventors: 邹志敏; 王师; 叶未顶; 卢威兴; 黄苏铭; 陈飞宇
Original assignee: Zhejiang Shimge Pump Co Ltd
Current assignee: Zhejiang Shimge Pump Co Ltd
Priority date: 2023-09-21
Filing date: 2023-09-21
Publication date: 2024-04-12
Anticipated expiration: 2033-09-21

Abstract

The utility model relates to a multistage centrifugal pump, which solves the problem caused by poor matching precision of a last-stage guide vane and a stainless steel pump cover which are of a split structure in the prior art, and adopts the following technical scheme: the multistage centrifugal pump comprises a pump shell, a pump cover matched with the open end of the pump shell, and an impeller string arranged in the pump shell, and is characterized in that a last-stage guide vane on the impeller string comprises a last-stage guide vane base, and the last-stage guide vane is welded at one end of the last-stage guide vane base, and the pump cover is integrally integrated at the other end of the last-stage guide vane base. The effect is that: the final stage guide vane base and the pump cover are integrated into an integral structure, and plastic materials are adopted, so that each part has higher machining precision during assembly, and the final stage guide vane is fixed through welding, so that the assembly precision is higher, the flatness and roundness of the pump cover are enabled to jump to be smaller, the assembly efficiency of the multistage centrifugal pump can be improved, the possibility of water leakage is reduced, and the pump efficiency of the multistage centrifugal pump is improved.

Description

Multistage centrifugal pump

Technical Field

The utility model relates to a multistage centrifugal pump, in particular to a multistage centrifugal pump integrating a last-stage guide vane and a pump cover.

Background

At present, last-stage guide vanes in a multistage centrifugal pump comprise a last-stage guide vane base and a last-stage guide vane, a pump cover and the last-stage guide vane base are of split structures, the pump cover is a stainless steel pump cover stamping part, and the flatness and roundness of parts of the stainless steel pump cover stamping part are larger, so that the assembly precision of the pump cover and the last-stage guide vane is poor, the coupling part and a pump shell are easy to cause poor assembly, and the flatness and roundness of the pump cover need to be repeatedly corrected or the pump cover with better flatness and roundness needs to be replaced, so that the assembly efficiency is reduced. In addition, even if the accuracy of the pump cover is slightly poor, the multistage centrifugal pump is likely to leak water in practical applications, which affects the pump efficiency.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provide a multistage centrifugal pump, wherein a last-stage guide vane base and a pump cover are integrated into a whole structure, and plastic materials are adopted, and then the last-stage guide vane is welded on the last-stage guide vane base to form an integral part.

The technical aim of the utility model is mainly solved by the following technical scheme: the multistage centrifugal pump comprises a pump shell, a pump cover matched with the open end of the pump shell, and an impeller string arranged in the pump shell, and is characterized in that the last stage guide vane of the impeller string comprises a last stage guide vane base, and the last stage guide vane is welded at one end of the last stage guide vane base, and the pump cover is integrally integrated at the other end of the last stage guide vane base. The final stage guide vane base and the pump cover are integrated into a whole structure, and plastic materials are adopted, and then the final stage guide vane is welded on the final stage guide vane base to form an integral part, so that each part has higher machining precision during assembly, and the final stage guide vane is fixed through welding, so that the assembly precision is higher, the flatness and roundness of the pump cover are enabled to be smaller, the assembly efficiency of the multistage centrifugal pump can be improved, the possibility of water leakage is reduced, and the pump efficiency of the multistage centrifugal pump is improved. In addition, the production cycle of the multistage centrifugal pump is shortened, and the production efficiency is improved.

As a further improvement and supplement to the technical scheme, the utility model adopts the following technical measures: the last-stage guide vane base, the last-stage guide vane and the pump cover are all made of plastic materials, and a plurality of water outlets are arranged on the side wall of the last-stage guide vane base. The pump cover and the last-stage guide vane base are of an integrated structure, so that gaps are avoided between the pump cover and the last-stage guide vane base, water leakage caused by the existence of the gaps is avoided, and the pump efficiency is improved. Meanwhile, the pump cover and the last-stage guide vane base are integrally formed through injection molding, so that the number of parts is reduced, and the assembly efficiency is improved. The pump cover is formed in an injection molding mode, has higher flatness and roundness, is beneficial to reducing runout and vibration after being assembled with the pump shell and the connecting piece, and is beneficial to improving the pump efficiency and the service life of the pump. Meanwhile, the stainless steel pump cover in the prior art is changed into the plastic pump cover, so that the raw material types can be reduced, the warehouse management is convenient, and the management cost and the storage cost are reduced.

Preferably, the side walls of the last stage guide vane base are support plates arranged at intervals, the support plates are arranged on the same annular surface taking the axis of the pump shaft as a central line, and the intervals between adjacent support plates are the water outlets. The adoption of the supporting plate structure is beneficial to saving raw material consumption, the water outlet with proper size can be conveniently formed, water flow is convenient to flow along the last-stage guide vane to outlet water, and further stable operation of the pump is facilitated, and pump efficiency is improved.

In order to form a good supporting effect and balance water flow, the number of the supporting plates is at least eight, the supporting plates are distributed in a central symmetry mode by taking the axis of the pump shaft as a symmetry line, each supporting plate is provided with a spigot towards the end part of the final stage guide vane, and the spigot is matched with the final stage guide vane to form a spigot and is welded. The setting of tang is favorable to stable and accurate fixed last stage stator, makes the axis of last stage stator and the axis of last stage stator base be located on same straight line, reduces hydraulic loss, has the multistage centrifugal pump steady operation of keeping. In the application, the shape of the spigot is the outer height and the inner land, so that the final stage guide vane can be conveniently and accurately fixed, and meanwhile, the welding is convenient.

Preferably, in order to reduce hydraulic loss, the inner surface of the supporting plate is a smooth arc surface, the radian of the smooth arc surface is consistent with the curvature of the circular ring where the supporting plate is located, a smooth inclined guide surface is arranged on the inner surface of the supporting plate and the inner surface of the pump cover, so that the inner surface of the supporting plate and the inner surface of the pump cover are in smooth transition, and a plurality of vertical ribs are arranged on the outer surface of the supporting plate.

Preferably, the inner surface of the pump cover is provided with a water retaining convex strip, the water retaining convex strip and the pump cover are of an integrated structure, the water retaining convex strip is radially arranged and is bent towards the shaft hole direction, and the inner end of the water retaining convex strip is close to the shaft hole part of the pump cover. The setting of manger plate sand grip is favorable to leading a portion of water to the shaft hole department of pump cover, conveniently dispels the heat to the mechanical seal that sets up in the shaft hole.

In order to increase the strength of the pump cover, a plurality of reinforcing ribs are respectively arranged on two sides of the pump cover:

preferably, the inner surface of the pump cover is further provided with a plurality of first reinforcing ribs arranged at intervals, the radial inner ends of the first reinforcing ribs are close to the shaft hole of the pump cover and are distributed in a central symmetry mode by taking the axis of the pump shaft as a symmetry line, and the first reinforcing ribs are of a triangular plate structure with high inner ends and low outer ends.

Preferably, the support plate on the last stage guide vane base and the outer edge of the pump cover have a distance, the inner surface of the pump cover is further provided with a plurality of second reinforcing ribs arranged at intervals, the second reinforcing ribs are arranged on a circular surface between the support plate and the outer edge of the pump cover, and the second reinforcing ribs are distributed in a central symmetry mode by taking the axis of the pump shaft as a symmetry line.

Preferably, a first reinforcing ring rib is arranged between adjacent support plates, a second reinforcing ring rib is arranged on the inner surface of the pump cover close to the outer edge, the height of the second reinforcing rib is matched with the height of the first reinforcing ring rib and the height of the second reinforcing ring rib, and two ends of the second reinforcing rib are respectively connected with the first reinforcing ring rib and the second reinforcing ring rib.

Preferably, the outer surface of the pump cover is provided with a plurality of annular ribs and radial ribs, the adjacent annular ribs are arranged at intervals, and the adjacent radial ribs are arranged at intervals.

In addition, the smooth inclined guide surface between the inner surface of the support plate and the inner surface of the pump cover is of a solid structure with the pump cover, so that the function of the reinforcing ribs is also realized, and the strength of the pump cover is also improved.

The utility model has the beneficial effects that: 1. the final stage guide vane base and the pump cover are integrated into a whole structure, and plastic materials are adopted, and then the final stage guide vane is welded on the final stage guide vane base to form an integral part, so that each part has higher machining precision during assembly, and the final stage guide vane is fixed through welding, so that the assembly precision is higher, the flatness and roundness of the pump cover are enabled to be smaller, the assembly efficiency of the multistage centrifugal pump can be improved, the possibility of water leakage is reduced, and the pump efficiency of the multistage centrifugal pump is improved. 2. The pump cover is also made of plastic materials, so that the raw material types are reduced, the warehouse management is convenient, and the management cost and the storage cost are reduced. 3. The pump cover is reinforced by the reinforcing ribs in various modes, so that the pump cover has enough strength when the multistage centrifugal pump works, and the service life of the multistage centrifugal pump is ensured. 4. The support plates are arranged in a central symmetry manner, and smooth transition surface treatment is performed on the inner surfaces, so that hydraulic loss can be reduced, hydraulic power can be balanced, stable operation of the multistage centrifugal pump is facilitated, and vibration is reduced. 5. The water retaining convex strips are integrally formed on the pump cover and are bent towards the shaft hole direction of the pump cover, so that drainage water is facilitated to cool the mechanical seal in the shaft hole.

Drawings

Fig. 1 is a schematic cross-sectional view of the present utility model.

Fig. 2 is a partially enlarged schematic structural view of fig. 1.

Fig. 3 is a schematic view of an exploded view of a pump body portion of the present utility model.

Fig. 4 is a schematic view of another vision of fig. 3.

Fig. 5 is a schematic view of an exploded construction of the impeller string of the present utility model.

Fig. 6 is a schematic view of an assembled impeller string according to the present utility model.

FIG. 7 is a schematic illustration of a construction of an integrated last stage vane base and pump cover of the present utility model.

Fig. 8 is a schematic view of another view of fig. 7. 2

In the figure: 1. a pump housing; 2. a pump cover; 3. an impeller string; 4. a last stage vane base; 5. a last stage vane; 6. a water outlet; 7. a support plate; 8. a spigot; 9. smoothly sloping guide surfaces; 10. vertical ribs; 11. water retaining convex strips; 12. a shaft hole; 13. a first reinforcing rib; 14. a second reinforcing rib; 15. a first reinforcing ring rib; 16. a second reinforcing ring rib; 17. annular ribs; 18. radial ribs; 19. a coupling.

Detailed Description

The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings.

Examples: the multistage centrifugal pump comprises a pump shell 1, a pump cover 2 matched with the open end of the pump shell 1, and an impeller string 3 arranged in the pump shell 1, and is characterized in that a last stage guide vane on the impeller string 3 comprises a last stage guide vane base 4 and a last stage guide vane 5 welded at one end of the last stage guide vane base 4, and the pump cover 2 is integrally integrated at the other end of the last stage guide vane base 4. The last-stage guide vane base 4 and the pump cover 2 are integrated into a whole, plastic materials are adopted, the last-stage guide vane 5 is welded on the last-stage guide vane base 4 to form an integral part, each part has higher machining precision, the pump cover 2 is clamped between the pump shell 1 and the connecting piece 19 during assembly, the fixed last-stage guide vane 5 is welded on the last-stage guide vane base 4, and the assembly precision is high due to the high precision of the pump cover 2, so that the flatness and roundness of the pump cover 2 are small, the assembly efficiency of the multistage centrifugal pump can be improved, the possibility of water leakage is reduced, and the pump efficiency of the multistage centrifugal pump is improved. In addition, the production cycle of the multistage centrifugal pump is shortened, and the production efficiency is improved.

The scheme is further supplemented and perfected, the last-stage guide vane base 4, the last-stage guide vane 5 and the pump cover 2 are all made of plastic materials, and a plurality of water outlets 6 are arranged on the side wall of the last-stage guide vane base 4. The pump cover 2 and the last-stage guide vane base 4 are of an integrated structure, so that gaps between the pump cover 2 and the last-stage guide vane base 4 are avoided, water leakage caused by gaps is avoided, and the pump efficiency is improved. Meanwhile, the pump cover 2 and the last-stage guide vane base 4 are integrally formed through injection molding, so that the number of parts is reduced, and the assembly efficiency is improved. The pump cover 2 is formed in an injection molding mode, has higher flatness and roundness, and is beneficial to reducing runout and vibration and improving pump efficiency and service life of the pump after being assembled with the pump shell 1 and the connecting piece. Meanwhile, as the stainless steel pump cover 2 in the prior art is changed into the plastic pump cover 2, the raw material types can be reduced, the warehouse management is convenient, and the management cost and the storage cost are reduced.

For hydraulic balance, the side walls of the final stage guide vane base 4 are support plates 7 arranged at intervals, the support plates 7 are arranged on the same annular surface taking the axis of the pump shaft as a central line, and the intervals between adjacent support plates 7 are the water outlets 6. Adopt backup pad 7 structure, be favorable to practicing thrift raw and other materials consumption, can conveniently form the delivery port 6 of suitable size again, make things convenient for rivers to flow to the play water along last stage stator 5, and then be favorable to the steady operation of pump, be favorable to improving pump efficiency.

In order to form a good supporting effect and balance water flow, the number of the supporting plates 7 is at least eight, the supporting plates 7 are distributed in a central symmetry mode by taking the axis of the pump shaft as a symmetry line, each supporting plate 7 is provided with a spigot 8 towards the end part of the final stage guide vane 5, and the spigot 8 is matched with the spigot 8 formed by the final stage guide vane 5 and welded. The spigot 8 is favorable for stably and accurately fixing the final stage guide vane 5, so that the axis of the final stage guide vane 5 and the axis of the final stage guide vane base 4 are positioned on the same straight line, the hydraulic loss is reduced, and the stable operation of the multistage centrifugal pump can be maintained. In the application, the shape of the spigot 8 is the outer height and the inner land, so that the final stage guide vane 5 is conveniently and accurately fixed, and meanwhile, the welding is convenient.

In order to reduce hydraulic loss, the inner surface of the supporting plate 7 is a smooth arc surface, the radian of the smooth arc surface is consistent with the curvature of the circular ring where the supporting plate 7 is located, a smooth inclined guide surface 9 is arranged on the inner surface of the supporting plate 7 and the inner surface of the pump cover 2, the inner surface of the supporting plate 7 and the inner surface of the pump cover 2 are in smooth transition, and a plurality of vertical ribs 10 are arranged on the outer surface of the supporting plate 7.

In addition, the smooth inclined guide surface 9 between the inner surface of the support plate 7 and the inner surface of the pump cover 2 is of a solid structure with the pump cover 2, and also plays a role of a reinforcing rib, which is beneficial to increasing the strength of the pump cover 2.

In the practical application of the multistage centrifugal pump, in order to fully utilize the water flow in the final stage guide vane base 4 to cool the mechanical seal, the inner surface of the pump cover 2 is provided with a water retaining convex strip 11, the water retaining convex strip 11 and the pump cover 2 are of an integrated structure, the water retaining convex strip 11 is radially arranged and is bent towards the shaft hole 12, and the inner end of the water retaining convex strip 11 is close to the shaft hole 12 of the pump cover 2. The water retaining convex strips 11 are beneficial to guiding a part of water to the shaft hole 12 of the pump cover 2, so that heat dissipation is conveniently carried out on the mechanical seal in the shaft hole 12.

The foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the utility model. In the above-described embodiments, the present utility model is susceptible to various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The multistage centrifugal pump comprises a pump shell (1), a pump cover (2) matched with the open end of the pump shell (1), and an impeller string (3) arranged in the pump shell (1), and is characterized in that the last stage guide vane on the impeller string (3) comprises a last stage guide vane base (4), and a last stage guide vane (5) welded at one end of the last stage guide vane base (4), and the pump cover (2) is integrally formed at the other end of the last stage guide vane base (4).

2. The multistage centrifugal pump according to claim 1, characterized in that the last stage guide vane base (4), the last stage guide vane (5) and the pump cover (2) are all made of plastic materials, and a plurality of water outlets (6) are arranged on the side wall of the last stage guide vane base (4).

3. Multistage centrifugal pump according to claim 2, characterized in that the side walls of the last stage guide vane base (4) are support plates (7) arranged at intervals, the support plates (7) are arranged on the same annulus taking the axis of the pump shaft as the central line, and the intervals between adjacent support plates (7) are the water outlets (6).

4. A multistage centrifugal pump according to claim 3, characterized in that the number of support plates (7) is at least eight, the support plates (7) are distributed in a central symmetry manner with the axis of the pump shaft as a symmetry line, each support plate (7) is provided with a spigot (8) towards the end of the last stage guide vane (5), and the spigot (8) is matched with and welded to the spigot (8) of the last stage guide vane (5).

5. The multistage centrifugal pump according to claim 4, wherein the inner surface of the supporting plate (7) is a smooth arc surface, the radian of the smooth arc surface is consistent with the curvature of the circular ring where the supporting plate (7) is located, a smooth inclined guide surface (9) is arranged on the inner surface of the supporting plate (7) and the inner surface of the pump cover (2), the inner surface of the supporting plate (7) and the inner surface of the pump cover (2) are in smooth transition, and a plurality of vertical ribs (10) are arranged on the outer surface of the supporting plate (7).

6. The multistage centrifugal pump according to any one of claims 1 to 5, characterized in that a water retaining protrusion (11) is provided on the inner surface of the pump cover (2), the water retaining protrusion (11) and the pump cover (2) are integrally formed, the water retaining protrusion (11) is radially provided and is bent toward the shaft hole (12), and the inner end of the water retaining protrusion (11) is close to the shaft hole (12) of the pump cover (2).

7. The multistage centrifugal pump according to claim 6, wherein the inner surface of the pump cover (2) is further provided with a plurality of first reinforcing ribs (13) arranged at intervals, the radial inner ends of the first reinforcing ribs (13) are close to the shaft hole (12) of the pump cover (2) and are distributed in a central symmetry manner by taking the axis of the pump shaft as a symmetry line, and the first reinforcing ribs (13) are in a triangular plate structure with high inner ends and low outer ends.

8. The multistage centrifugal pump according to claim 7, characterized in that a supporting plate (7) on the last stage guide vane base (4) and the outer edge of the pump cover (2) are provided with a distance, the inner surface of the pump cover (2) is further provided with a plurality of second reinforcing ribs (14) arranged at intervals, the second reinforcing ribs (14) are arranged on a circular ring surface between the supporting plate (7) and the outer edge of the pump cover (2), and the second reinforcing ribs (14) are distributed in a central symmetry manner by taking the axis of a pump shaft as a symmetry line.

9. The multistage centrifugal pump according to claim 8, wherein a first reinforcing ring rib (15) is arranged between adjacent support plates (7), a second reinforcing ring rib (16) is arranged on the inner surface of the pump cover (2) near the outer edge part, the height of the second reinforcing rib (14) is matched with the heights of the first reinforcing ring rib (15) and the second reinforcing ring rib (16), and two ends of the second reinforcing rib (14) are respectively connected with the first reinforcing ring rib (15) and the second reinforcing ring rib (16).

10. Multistage centrifugal pump according to claim 9, characterized in that the outer surface of the pump cover (2) is provided with a plurality of annular ribs (17) and radial ribs (18), adjacent to the annular ribs (17) being arranged at intervals, adjacent to the radial ribs (18) being arranged at intervals.