Double casing multi-stage pump with guide vanes and volutes

Abstract

The utility model relates to multistage pump technical field especially suitable for petrochemical, coalification, clean energy and food industry's guide vane and volute combined double -shell multistage pump, the inside of inner casing is provided with guide vane, constitutes inner casing part, guide vane and volute are positioned through cylinder pin A, the assembly first -body mouth ring and secondary body mouth ring between guide vane and shaft of drive side are installed, the assembly non -drive body mouth ring and secondary body mouth ring between guide vane and shaft of non -drive side are installed, the anti -rotation groove in the inside of inner casing is assembled with intermediate bushing through cylinder pin B, the assembly intermediate shaft sleeve between intermediate bushing and shaft, the impeller is set up between guide vanes, to prevent falling on the shaft in the installation process, the installation process needs through the snap ring to carry out the location to the impeller, the technical scheme of the utility model has solved the low efficiency of pump in the prior art, the problem that application range is not enough extensive, dismounting difficult.

Description

Technical Field

[0001] This utility model relates to the field of multistage pump technology, and in particular to a double-casing multistage pump with guide vanes and volutes suitable for the petrochemical, coal chemical, clean energy and food industries. Background Technology

[0002] Currently, the structure of a horizontal double-casing multistage pump mainly consists of a cylindrical body, pump cover, rotor, inner casing, balancing mechanism, bearings, and sealing components. When the pump starts, the liquid is thrown out of the impeller and into the inner casing by the centrifugal force generated by the high-speed rotation of the impeller. Inside the inner casing, the liquid velocity decreases, and some kinetic energy is converted into pressure energy. The liquid then flows into the next impeller, and so on, stage by stage. The liquid continuously gains energy from the impellers, the pressure gradually increases, and finally, it is discharged from the pump outlet, achieving continuous liquid transfer. However, existing multistage pumps suffer from increased energy loss due to the complex flow path of the liquid within the inner casing, leading to increased flow resistance and reduced pump efficiency. Furthermore, the complex structure of some parts in double-casing multistage pumps makes installation, maintenance, and disassembly cumbersome, increasing maintenance costs and downtime.

[0003] In view of the problems existing in the above-mentioned prior art, it is necessary to study and design a new type of guide vane and volute combined double-casing multistage pump to overcome the problems existing in the prior art. Summary of the Invention

[0004] To address the technical problems of low efficiency, limited application range, and difficult disassembly and assembly of existing pumps, this invention provides a double-casing multistage pump with a guide vane and volute combination. This invention primarily utilizes a flow-channel guide vane and volute combination structure and a split-segment structure for components such as the guide vane, retaining ring, and intermediate bushing, thereby improving pump efficiency and reducing downtime and maintenance costs.

[0005] The technical means adopted in this utility model are as follows:

[0006] A multistage pump with a guide vane and volute combination, comprising: a cylindrical body; the cylindrical body and the pump cover are connected by studs A, nuts A, and gaskets A, and sealed by a spiral wound gasket A; a throttling bushing and a throttling shaft sleeve are provided between the pump cover and the shaft; a sealing assembly and a bearing assembly are respectively assembled on the outside of the pump cover by studs C and D; the cylindrical body and the sealing housing are connected by studs B, nuts B, and gaskets B, and sealed by a spiral wound gasket B; the pump cover is connected and positioned to the inner housing by screws A; throat bushings are respectively assembled on the pump cover and the sealing housing by screws B;

[0007] Furthermore, guide vanes are provided inside the inner shell to form the inner shell component;

[0008] Furthermore, the guide vane and the inner housing are positioned by a cylindrical pin A; the guide vane on the drive side is fitted with a first-stage body mouth ring and a second-stage body mouth ring between it and the shaft; the guide vane on the non-drive side is fitted with a non-drive body mouth ring and a second-stage body mouth ring between it and the shaft.

[0009] Furthermore, an intermediate bushing is fitted into the anti-rotation groove inside the inner housing via a cylindrical pin B; an intermediate bushing is fitted between the intermediate bushing and the shaft.

[0010] Furthermore, an impeller is provided between the guide vanes. To prevent it from falling off the shaft during installation, a retaining ring is needed to limit the impeller during installation.

[0011] Furthermore, the inner shell has a horizontally split structure;

[0012] Furthermore, the guide vanes are flow channel type, resulting in minimal hydraulic loss.

[0013] Furthermore, the guide vane, intermediate bushing, and secondary body mouth ring all adopt a split structure, which is more conducive to disassembly and assembly.

[0014] Furthermore, the retaining ring, intermediate bushing, and throttling bushing are all tightly fitted to the shaft through the fitting clearance.

[0015] Furthermore, the impeller includes: a non-drive end secondary impeller, a non-drive end final stage impeller, a drive end final stage impeller, a drive end secondary impeller, and a first stage impeller;

[0016] Furthermore, the non-drive end secondary impeller, the non-drive end final stage impeller and the drive end final stage impeller, and the drive end secondary impeller are arranged symmetrically, so it can be approximately assumed that the axial forces acting on the impellers can cancel each other out.

[0017] Furthermore, the intermediate bushing and throat bushing can balance some of the residual axial forces.

[0018] Furthermore, the cylinder, pump cover, and sealing housing all adopt a forging and welded structure, making the pump safe and reliable in operation.

[0019] The assembly process of the inner shell component of this utility model is as follows:

[0020] First, install the non-drive end impeller, non-drive end secondary impeller, drive end end impeller, drive end secondary impeller, and retaining ring sequentially onto the shaft. Then, install the split guide vanes and the lower half of the secondary body ring into the lower half of the inner casing. Next, install the rotor assembly, consisting of the non-drive end impeller, non-drive end secondary impeller, drive end end impeller, drive end secondary impeller, retaining ring, and shaft, into the lower half of the inner casing 8. Then, install the split guide vanes and secondary body ring from the upper half sequentially. Finally, assemble the upper half of the inner casing 8.

[0021] The working process of this utility model is as follows:

[0022] The medium enters the first-stage impeller from the pump inlet. The high-speed rotation of the first-stage impeller increases its kinetic energy. The medium flows out of the first-stage impeller and enters the guide vanes. The guide vanes convert the kinetic energy into pressure energy. The medium flows into the volute in a specified direction. The volute further ensures that the medium flows smoothly into the next stage impeller. After circulating through multiple stages of pressurization, the medium is finally discharged from the pump outlet.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The guide vane and volute combined double-casing multistage pump provided by this utility model has a structure of forging and welding for the cylinder component, pump cover component and sealing box component, which is safe and reliable in operation;

[0025] 2. The guide vane and volute combined double-casing multistage pump provided by this utility model has a rotor component and impeller arranged back to back, which can balance most of the axial thrust. The thrust bearing only needs to bear a small part of the thrust, so the bearing life is longer.

[0026] 3. The guide vane and volute combined double-casing multistage pump provided by this utility model adopts a guide vane and volute combined structure for the inner casing component, eliminating the volute flow channel design, which is convenient for casting and processing.

[0027] 4. The guide vane and volute combined double-casing multistage pump provided by this utility model has a flow channel guide vane with a split structure inside the volute. The flow channel guide vane has low hydraulic loss, which can improve the pump efficiency, and the split structure is more conducive to disassembly and assembly.

[0028] 5. The guide vane and volute combined double-casing multistage pump provided by this utility model allows for the replacement of individual guide vanes.

[0029] 6. The guide vane and volute combination double-casing multistage pump provided by this utility model improves efficiency and reduces energy loss;

[0030] 7. The guide vane and volute combination double-casing multistage pump provided by this utility model is suitable for different flow and pressure conditions and has a wide range of applications.

[0031] 8. The guide vane and volute combined double-casing multistage pump provided by this utility model has a simple structure, reduces casting difficulty, and reduces processing costs. It is also convenient for assembly, disassembly, and maintenance.

[0032] In summary, the technical solution of this utility model solves the problems of low efficiency, limited application range, and difficulty in disassembly and assembly of pumps in the prior art. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a schematic diagram of the inner shell component structure of this utility model;

[0036] Figure 3 This is a schematic diagram of the guide vane structure of this utility model;

[0037] Figure 4 This is a schematic diagram of the intermediate split surface structure of the guide vane of this utility model;

[0038] Figure 5 This is a three-dimensional view of the split structure of the guide vane of this utility model;

[0039] Figure 6 This is a schematic diagram of the intermediate split surface structure of the body ring / shroud of this utility model;

[0040] Figure 7 This is a schematic diagram of the body mouth ring / shroud structure of this utility model.

[0041] In the diagram: 1. Bearing assembly; 2. Sealing assembly; 3. Throttling bushing; 4. Throttling shaft sleeve; 5. Pump cover; 6. Screw A; 7. Non-drive body inlet ring; 8. Inner housing; 9. Non-drive end secondary impeller; 10. Cylinder; 11. Cylindrical pin A; 12. Non-drive end final stage impeller; 13. Intermediate shaft sleeve; 14. Intermediate bushing; 15. Drive end final stage impeller; 16. Secondary body inlet ring; 17. Drive end secondary impeller; 18. Guide vane; 19. Snap ring; 20. First stage impeller; 21. First stage body inlet ring; 22. Sealing housing; 23. Throat bushing; 24. Shaft; 25. Stud A; 26. Nut A; 27. Washer A; 28. Stud B; 29. ​​Nut B; 30. Washer B; 31. Stud C; 32. Stud D; 33. Metal spiral wound gasket A; 34. Metal spiral wound gasket B; 35. Cylindrical pin B; 36. Screw B. Detailed Implementation

[0042] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0049] As shown in the figure, this utility model provides a double-casing multistage pump with a guide vane and volute combination, including: a cylinder 10; the cylinder 10 and the pump cover 5 are connected by studs A25, nuts A26 and gaskets A27, and sealed by a spiral wound gasket A33; a throttling bushing 3 and a throttling shaft sleeve 4 are provided between the pump cover 5 and the shaft 24; a sealing assembly 2 and a bearing assembly 1 are respectively assembled on the outside of the pump cover 5 by studs C31 and D32; the cylinder 10 and the sealing housing 22 are connected by studs B28, nuts B29 and gaskets B30, and sealed by a spiral wound gasket B34; the pump cover 5 is connected and positioned to the inner housing 8 by screws A6; throat bushings 23 are respectively assembled on the pump cover 5 and the sealing housing 22 by screws B36.

[0050] The inner housing 8 is provided with guide vanes 18, forming an inner housing component; the guide vanes 18 and the inner housing 8 are positioned by cylindrical pins A11; the guide vanes 18 mounted on the drive side are fitted with a first-stage body ring 21 and a second-stage body ring 16 between the shaft 24; the guide vanes 18 mounted on the non-drive side are fitted with a non-drive body ring 7 and a second-stage body ring 16 between the shaft 24.

[0051] An intermediate bushing 14 is fitted in the anti-rotation groove inside the inner housing 8 via a cylindrical pin B35; an intermediate bushing 13 is fitted between the intermediate bushing 14 and the shaft 24; an impeller is provided between the guide vanes 18, and to prevent it from falling off the shaft 24 during installation, the impeller needs to be limited by a retaining ring 19 during installation.

[0052] The inner shell 8 has a horizontally split structure; the guide vane 18 is a flow channel type guide vane, which has low hydraulic loss.

[0053] The guide vane 18, intermediate bushing 14 and secondary body mouth ring 16 all adopt a split structure, which makes it easier to disassemble and assemble.

[0054] The retaining ring 19, intermediate bushing 13 and throttling bushing 4 are all tightly fitted with the shaft 24 through the fitting clearance.

[0055] The impeller includes: a non-drive end secondary impeller 9, a non-drive end final stage impeller 12, a drive end final stage impeller 15, a drive end secondary impeller 17, and a first stage impeller 20; the non-drive end secondary impeller 9, the non-drive end final stage impeller 12, the drive end final stage impeller 15, and the drive end secondary impeller 17 are arranged symmetrically, and it can be approximately considered that the axial forces acting on the impeller can cancel each other out.

[0056] The intermediate bushing 14 and the throat bushing 23 can balance some of the residual axial force.

[0057] The cylinder 10, pump cover 5, and sealing box 22 are all constructed using forging and welding, ensuring the overall safe and reliable operation of the pump.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A double casing multi-stage pump of the type comprising a volute and a guide vane, comprising: The cylinder (10) is connected to the pump cover (5) by studs A (25), nuts A (26) and gaskets A (27), and sealed by spiral wound gaskets A (33). A throttling bushing (3) and a throttling shaft sleeve (4) are provided between the pump cover (5) and the shaft (24). A sealing assembly (2) and a bearing assembly (1) are respectively assembled on the outside of the pump cover (5) by studs C (31) and studs D (32). The cylinder (10) is connected to the sealing housing (22) by studs B (28), nuts B (29) and gaskets B (30), and sealed by spiral wound gaskets B (34). The pump cover (5) is connected and positioned to the inner housing (8) by screws A (6). Throat bushings (23) are respectively assembled on the pump cover (5) and the sealing housing (22) by screws B (36). The features are: The inner shell (8) is provided with guide vanes (18) to form the inner shell component; The guide vane (18) and the inner shell (8) are positioned by a cylindrical pin A (11); a first-stage body mouth ring (21) and a second-stage body mouth ring (16) are assembled between the guide vane (18) on the drive side and the shaft (24); a non-drive body mouth ring (7) and a second-stage body mouth ring (16) are assembled between the guide vane (18) on the non-drive side and the shaft (24). An intermediate bushing (14) is assembled in the anti-rotation groove inside the inner shell (8) via a cylindrical pin B (35); an intermediate bushing (13) is assembled between the intermediate bushing (14) and the shaft (24). An impeller is provided between the guide vanes (18). To prevent it from falling off the shaft (24) during installation, the impeller needs to be limited by a retaining ring (19) during installation.

2. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The inner shell (8) is a horizontally split structure.

3. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The guide vane (18) is a flow channel type guide vane with low hydraulic loss.

4. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The guide vane (18), intermediate bushing (14) and secondary body mouth ring (16) all adopt a split structure, which is more conducive to disassembly and assembly.

5. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The retaining ring (19), intermediate bushing (13) and throttling bushing (4) are all tightly fitted with the shaft (24) through the fitting clearance.

6. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The impeller includes: a non-drive end secondary impeller (9), a non-drive end final stage impeller (12), a drive end final stage impeller (15), a drive end secondary impeller (17), and a first stage impeller (20). The non-drive end secondary impeller (9), the non-drive end final stage impeller (12), the drive end final stage impeller (15), and the drive end secondary impeller (17) are arranged symmetrically, and it can be approximately assumed that the axial forces acting on the impellers can cancel each other out.

7. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The intermediate bushing (14) and throat bushing (23) can balance some of the residual axial force.

8. The guide vane and volute combined double-casing multistage pump according to claim 1, characterized in that: The cylinder (10), pump cover (5) and sealing box (22) are all made of forging and welded structure, which makes the pump safe and reliable in operation.

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