CN209892497U - First-stage impeller structure of multi-stage pump - Google Patents
First-stage impeller structure of multi-stage pump Download PDFInfo
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- CN209892497U CN209892497U CN201920814335.5U CN201920814335U CN209892497U CN 209892497 U CN209892497 U CN 209892497U CN 201920814335 U CN201920814335 U CN 201920814335U CN 209892497 U CN209892497 U CN 209892497U
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Abstract
The utility model discloses a first-stage impeller structure of a multi-stage pump, which comprises a pump shaft, a first-stage middle-stage body, a secondary middle-stage body, a first-stage impeller, a secondary impeller and a guide bearing, wherein the first-stage impeller and the secondary impeller are sleeved on the pump shaft and are fixedly connected with the pump shaft; the primary impeller is fixed at the front end of the pump shaft and is of a cantilever type structure, and the guide bearing is sleeved on the pump shaft between the primary impeller and the secondary impeller. The multistage pump with the structure has the advantages of good suction state of the first-stage impeller, high working efficiency, good anti-cavitation performance, simple overall structure and convenient disassembly and maintenance.
Description
Technical Field
The utility model relates to a pump technical field specifically is a first impeller department structure that relates to a multistage pump.
Background
In the prior art, a pump shaft of a multistage pump usually adopts a double-support structure, which is specifically characterized in that a plurality of impellers are all sleeved on the pump shaft and are located between double-support points, namely the impellers are generally of a shaft penetrating type structure.
In the prior art, as shown in fig. 1, a first-stage impeller structure of a multi-stage pump includes a pump shaft 1, a first-stage middle-stage body 2, a second-stage middle-stage body 3, a first-stage impeller 4, a second-stage impeller 5 and a guide bearing, wherein the guide bearing is sleeved at the front end part of the pump shaft 1 (the water inlet side of the primary impeller 4 is taken as the front part of the pump shaft 1, the guide bearing is arranged on the pump shaft 1 at the front side of the primary impeller 4 and is responsible for supporting the front part of the pump shaft 1), the guide bearing is used for supporting the pump shaft 1 and is rotationally connected with the pump shaft 1, the primary impeller 4 and the secondary impeller 5 are both sleeved on the pump shaft 1 at the rear side of the guide bearing and are fixedly connected with the pump shaft 1, namely, the first-stage impeller 4 of the multi-stage pump in the prior art also adopts a shaft penetrating structure, but the technical scheme that the pump shaft 1 penetrates through the first-stage impeller 4 can interfere with the fluid flow at the inlet of the first-stage impeller 4, influence the suction state of the first-stage impeller 4 and adversely influence the working efficiency and the cavitation performance of the pump; and the technical scheme that the pump shaft 1 penetrates through the primary impeller 4 influences the structure of the primary impeller 4, such as the design and manufacture of a hub, so that the hub of the primary impeller 4 cannot be designed and manufactured according to the optimal hydraulic requirement, and thus the structure of the primary impeller 4 also interferes the medium flow at the inlet of the primary impeller to influence the suction state of the primary impeller 4 and also adversely influences the working efficiency and the cavitation performance of the pump.
SUMMERY OF THE UTILITY MODEL
The aforesaid to prior art exists not enoughly, the utility model aims to provide a multistage pump's first impeller department structure, this multistage pump's first impeller department structure has improved the suction state of first impeller, has improved the work efficiency and the anti cavitation performance of pump.
In order to achieve the above object, the utility model adopts the following technical scheme:
a primary impeller structure of a multi-stage pump comprises a pump shaft, a primary middle section body, a secondary middle section body, a primary impeller, a secondary impeller and a guide bearing, wherein the primary impeller and the secondary impeller are sleeved on the pump shaft and are fixedly connected with the pump shaft; the primary impeller is fixed at the front end of the pump shaft and is of a cantilever type structure, and the guide bearing is sleeved on the pump shaft between the primary impeller and the secondary impeller.
In the structure of the primary impeller of the multi-stage pump, the guide bearing is sleeved on the pump shaft between the primary impeller and the secondary impeller, so that the primary impeller can adopt a cantilever type structure, the primary impeller is not influenced by the pump shaft when sucking fluid, and the primary impeller can be designed and manufactured according to the optimal hydraulic requirement.
Further, the first-stage middle-section body is provided with a positive guide vane and a transition flow channel, the transition flow channel is located the positive guide vane rear side, the secondary middle-section body is provided with a return guide vane, and the first-stage middle-section body and the secondary middle-section body between the transition flow channel and the return guide vane are combined to form an annular space, and after the pump works, fluid flows into the secondary impeller after sequentially passing through the first-stage impeller, the positive guide vane, the transition flow channel, the annular space and the return guide vane. In the structure, a positive guide vane at the outlet of a first-stage impeller, a transition flow passage and a first-stage outer shell wall form an integral part, namely a first-stage middle section body, which mainly plays a role of a water pressing chamber in a hydraulic structure; the reverse guide vane and the shell wall of the secondary middle section form a part, namely a secondary middle section body, which mainly plays the role of a secondary impeller water suction chamber in a hydraulic structure and leads the medium flowing out from the outlet of the primary impeller into the inlet of the secondary impeller after being assembled by a primary middle section body and a secondary middle section body; the transition flow channel adopts an axial inclined lengthening design, and the axial inclination is convenient to follow the flowing rotation direction of the medium flowing out of the positive guide vane, so that the hydraulic impact loss is reduced; the lengthened design of the transition flow channel is convenient for adding a guide bearing between the first-stage impeller and the secondary impeller, so that a bearing support structure in front of the first-stage impeller is eliminated, the first-stage impeller adopts a cantilever type structure, and the radial support effect of a rotor component of the multi-stage pump is met.
Further, the guide bearing sleeve is arranged on the inner side of the primary middle section body and fixedly connected with the primary middle section body.
Furthermore, a circular weight reduction groove is formed in the surface, close to the first-stage impeller, of the first-stage middle section body. The weight of the first-stage middle section body is reduced by the arrangement of the weight reduction grooves, and the material cost is further reduced.
Furthermore, a first connecting cavity and a second connecting cavity are arranged on the inner side of the first-stage middle section body, the second connecting cavity is located on the rear side of the first connecting cavity, and the diameter of the second connecting cavity is larger than that of the first connecting cavity; the guide bearing comprises a first connecting part and a second connecting part, the second connecting part is positioned at the rear side of the first connecting part, and the diameter of the second connecting part is larger than that of the first connecting part; the first connecting portion is matched with the first connecting cavity, and the second connecting portion is matched with the second connecting cavity. The step type guide bearing is convenient to be positioned and connected with the inner side of the first-stage middle section body.
Further, the second connecting portion is connected with the first-stage middle section body through screws. The guide bearing is clamped on the inner side of the first-stage middle section body and connected through screws, and the connecting structure is stable.
Further, an annular groove portion is arranged in the middle of the first connecting cavity along the circumferential direction, and the diameter of the annular groove portion is larger than that of the first connecting portion. The arrangement of the annular groove part reduces the matching surface of the guide bearing and the first-stage middle section body, and the guide bearing and the first-stage middle section body are convenient to mount.
Further, the front end of the pump shaft is provided with an impeller nut for fixing the first-stage impeller, the impeller nut is hemispherical, the maximum diameter of the impeller nut is abutted to the front end of the hub of the first-stage impeller, and the maximum diameter of the impeller nut is smaller than the outer diameter of the hub at the inlet of the first-stage impeller. The hemispherical impeller nut is beneficial to hydraulic design of the first-stage impeller according to the optimal requirement.
Further, guide bearing and pump shaft sliding connection, the first-stage impeller passes through wheel hub and pump shaft key-type connection, positive stator and anti-stator all along pump shaft circumference evenly distributed.
Compared with the prior art, the beneficial effects of the utility model are mainly embodied in that:
1. in the structure of the first-stage impeller of the multi-stage pump, the first-stage impeller is of a cantilever type structure, namely, a pump shaft does not penetrate through an impeller inlet, so that the first-stage impeller is not influenced by the pump shaft when fluid is sucked, the first-stage impeller can be designed and manufactured according to the optimal hydraulic requirement, the suction state of the first-stage impeller is improved, and the cavitation resistance of the pump is improved;
2. the positive guide vane at the outlet of the first-stage impeller, the transition flow channel and the wall of the first-stage outer shell form an integral part, namely a first-stage middle section body, the reverse guide vane and the wall of the second-stage middle section outer shell form a part, namely a second-stage middle section body, the integration degree of the parts is high, the installation is convenient, the transition flow channel adopts an axial inclined lengthening design, the flowing rotation direction of a medium flowing out of the positive guide vane is convenient to follow, and the hydraulic impact loss is reduced;
3. the sliding guide bearing has the advantages of small size, simple structure, easy manufacture, good vibration absorption performance and the like;
4. overall structure is simple practical, and convenient to detach overhauls, no matter the part adopts foundry goods or forging all be convenient for process moreover.
Drawings
FIG. 1 is a schematic view of the first stage impeller of a conventional multistage pump;
fig. 2 is a schematic structural view of a first-stage impeller of a multi-stage pump according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the first stage midsection body;
FIG. 4 is a front view of the first stage midsection body;
FIG. 5 is a cross-sectional view of a secondary midsection body;
fig. 6 is a front view of a secondary midsection.
In the attached drawings, 1-pump shaft; 2-first-stage middle-stage body; 3-a secondary midbody; 4-first stage impeller; 5-a secondary impeller; 6-a guide bearing; 7-impeller nut;
21-positive guide vanes; 22-a transition flow channel; 23-weight reduction slots; 24-a first connection chamber; 25-a second connecting chamber; 31-a return vane; 32-annular space.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
In fig. 2, the fluid suction side is taken as the pump shaft leading end.
As shown in fig. 2, the first-stage impeller structure of the multi-stage pump of this embodiment includes a pump shaft 1, a first-stage middle-stage body 2, a second-stage middle-stage body 3, a first-stage impeller 4, a second-stage impeller 5, and a guide bearing 6, wherein the first-stage impeller 4 and the second-stage impeller 5 are both sleeved on the pump shaft 1 and are fixedly connected to the pump shaft 1, the first-stage impeller 4 is fixed to the front end of the pump shaft 1 and is in a cantilever structure, the guide bearing 6 is sleeved on the pump shaft 1 between the first-stage impeller 4 and the second-stage impeller 5, and the guide bearing 6 is used for supporting the pump shaft 1 and is rotatably connected. In the structure of the primary impeller of the multistage pump, the guide bearing 6 is sleeved on the pump shaft 1 between the primary impeller 4 and the secondary impeller 5, so that the primary impeller 4 can adopt a cantilever type structure, the primary impeller 4 cannot be influenced by the pump shaft 1 when sucking fluid, and the primary impeller 4 can be designed and manufactured according to the optimal hydraulic requirement.
As shown in fig. 2 to 6, the first-stage middle-stage body 2 is provided with a positive guide vane 21 and a transition flow passage 22, the transition flow passage 22 is located at the rear side of the positive guide vane 21, the second-stage middle-stage body 3 is provided with a reverse guide vane 31, an annular space 32 is formed at the joint of the first-stage middle-stage body 2 and the second-stage middle-stage body 3 between the transition flow passage 22 and the reverse guide vane 31, and after the pump works, the fluid flows into the second-stage impeller 5 after passing through the first-stage impeller 4, the positive guide vane 21, the transition flow passage 22, the annular space 32 and the. In the structure, a positive guide vane 21 at the outlet of a first-stage impeller, a transition flow passage 22 and a first-stage outer shell wall form an integral part, namely a first-stage middle section body, which mainly plays a role of a water pressing chamber in a hydraulic structure; the return guide vane 31 and the outer shell wall of the secondary middle section form a part, namely a secondary middle section, which mainly plays the role of a water suction chamber of a secondary impeller in a hydraulic structure, and the assembly of the primary middle section and the secondary middle section realizes the introduction of a medium flowing out of the outlet of the primary impeller into the inlet of the secondary impeller; the transition flow channel 22 adopts an axial inclined lengthening design, and the axial inclination is convenient for following the flowing rotation direction of the medium flowing out of the positive guide vane 21, so that the hydraulic impact loss is reduced; the transition flow passage 22 is designed to be lengthened so as to add the guide bearing 6 between the first-stage impeller 4 and the second-stage impeller 5, so that a bearing support structure in front of the first-stage impeller 4 is eliminated, the first-stage impeller 4 is in a cantilever structure, and the radial support effect of the rotor component of the multi-stage pump is met. Specifically, the structure combines a conventional radial guide vane and guide bearing structure, namely, liquid flowing out of a positive guide vane 21 enters a transition flow passage 22, the transition flow passage 22 deflects according to a proper flow angle, a medium is introduced into an inlet of a secondary impeller from the transition flow passage 22 through an annular space 32 and then through a reverse guide vane 31, and meanwhile, a guide bearing 6 is arranged on a pump shaft 1 between a primary impeller 4 and a secondary impeller 5 by utilizing the axial length of the transition flow passage 22 so as to ensure the operation stability of a pump rotor; in practical applications, the first middle section 2 and the second middle section 3 may both adopt other structures, such as a split structure shown in fig. 1, as long as installation and use are not affected.
As shown in fig. 2 to 4, the guide bearing 6 is sleeved on the inner side of the first-stage middle-stage body 2 and is fixedly connected with the first-stage middle-stage body 2, in order to reduce the weight of the first-stage middle-stage body 2 and reduce the material cost, a circular weight-reducing groove 23 is arranged on the side of the first-stage middle-stage body 2 close to the first-stage impeller 4, and in practical application, the guide bearing can also be arranged in a plurality of weight-reducing holes to reduce the weight of the first-stage middle-stage body 2. In this embodiment, the inner side of the first-stage middle section body 2 is provided with a first connection cavity 24 and a second connection cavity 25, the second connection cavity 25 is located at the rear side of the first connection cavity 24, and the diameter of the second connection cavity 25 is larger than that of the first connection cavity 24; the guide bearing 6 comprises a first connecting part and a second connecting part, the second connecting part is positioned at the rear side of the first connecting part, and the diameter of the second connecting part is larger than that of the first connecting part; the first connection portion is adapted to the first connection chamber 24 and the second connection portion is adapted to the second connection chamber 25.
As shown in fig. 2, the second connecting portion and the first-stage middle-stage body 2 are both provided with screw connecting holes, so that the guide bearing 6 is sleeved on the inner side of the first-stage middle-stage body 2 and then connected by screws, and in practical application, the guide bearing 6 and the first-stage middle-stage body 2 can be positioned and connected by pins or are in interference fit, so long as installation and use are not affected. Specifically, in this embodiment, in order to facilitate the installation of the guide bearing 6 and the first-stage middle-stage body 2, the fitting surface between the guide bearing 6 and the first-stage middle-stage body 2 is appropriately reduced, and the middle portion of the first connection cavity 24 is provided with an annular groove portion along the circumferential direction, and the diameter of the annular groove portion is greater than that of the first connection portion.
As shown in fig. 2, an impeller nut 7 for fixing the first-stage impeller 4 is arranged at the front end of the pump shaft 1, in order to facilitate the hydraulic design of the first-stage impeller 4 according to the optimal requirement, the impeller nut 7 is hemispherical, the maximum diameter of the impeller nut 7 is abutted against the front end of the hub of the first-stage impeller 4, and the maximum diameter of the impeller nut 7 is smaller than the outer diameter of the hub at the inlet of the first-stage impeller 4.
As shown in fig. 2, in the present embodiment, in order to facilitate disassembly and assembly, the primary impeller 4 and the secondary impeller 5 are both connected with the pump shaft 1 in a key manner; in order to increase the operation stability of the pump, the guide bearing 6 is connected with the pump shaft 1 in a sliding way (the sliding guide bearing 6 has small size, simple structure, easy manufacture and better vibration absorption performance); in order to make the fluid flow effect good, the positive guide vanes 21 and the negative guide vanes 31 are uniformly distributed along the circumferential direction of the pump shaft 1; therefore, the structure is simple as a whole, and a plurality of parts are convenient to process no matter adopting castings or forgings.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the applicant has described the present invention in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the technical solutions should be covered by the scope of the claims of the present invention.
Claims (9)
1. A primary impeller structure of a multi-stage pump comprises a pump shaft, a primary middle section body, a secondary middle section body, a primary impeller, a secondary impeller and a guide bearing, wherein the primary impeller and the secondary impeller are sleeved on the pump shaft and are fixedly connected with the pump shaft; the method is characterized in that: the primary impeller is fixed at the front end of the pump shaft and is of a cantilever type structure, and the guide bearing is sleeved on the pump shaft between the primary impeller and the secondary impeller.
2. The primary impeller structure of a multi-stage pump according to claim 1, wherein: the first-stage middle-section body is provided with positive stator and transition runner, the transition runner is located positive stator rear side, the secondary middle-section body is provided with the kickback vane, and the first-stage middle-section body and the secondary middle-section body junction between transition runner and the kickback vane constitute the annular space, and after pump work, the fluid flows into secondary impeller behind first-stage impeller, positive stator, transition runner, annular space and the kickback vane in proper order.
3. The primary impeller structure of a multi-stage pump according to claim 2, wherein: the guide bearing is sleeved on the inner side of the primary middle section body and is fixedly connected with the primary middle section body.
4. The primary impeller structure of a multi-stage pump according to claim 3, wherein: and a circular weight reduction groove is formed in the surface of the first-stage middle section body, close to the first-stage impeller.
5. The primary impeller structure of a multi-stage pump according to claim 3, wherein: a first connecting cavity and a second connecting cavity are arranged on the inner side of the first-stage middle section body, the second connecting cavity is positioned on the rear side of the first connecting cavity, and the diameter of the second connecting cavity is larger than that of the first connecting cavity; the guide bearing comprises a first connecting part and a second connecting part, the second connecting part is positioned at the rear side of the first connecting part, and the diameter of the second connecting part is larger than that of the first connecting part; the first connecting portion is matched with the first connecting cavity, and the second connecting portion is matched with the second connecting cavity.
6. The primary impeller structure of a multi-stage pump according to claim 5, wherein: the second connecting part is connected with the first-stage middle section body through screws.
7. The primary impeller structure of a multi-stage pump according to claim 5, wherein: the middle part of the first connecting cavity is provided with an annular groove part along the circumferential direction, and the diameter of the annular groove part is larger than that of the first connecting part.
8. The primary impeller structure of the multi-stage pump according to claim 1 ~ 7, wherein the front end of the pump shaft is provided with an impeller nut for fixing the primary impeller, the impeller nut is hemispherical, the maximum diameter of the impeller nut abuts against the front end of the hub of the primary impeller, and the maximum diameter of the impeller nut is smaller than the outer diameter of the hub at the inlet of the primary impeller.
9. The primary impeller structure of a multi-stage pump according to claim 2, wherein: the guide bearing is connected with the pump shaft in a sliding mode, the first-stage impeller is connected with the pump shaft key through a hub, and the positive guide vane and the negative guide vane are uniformly distributed along the circumferential direction of the pump shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920814335.5U CN209892497U (en) | 2019-05-31 | 2019-05-31 | First-stage impeller structure of multi-stage pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920814335.5U CN209892497U (en) | 2019-05-31 | 2019-05-31 | First-stage impeller structure of multi-stage pump |
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| Publication Number | Publication Date |
|---|---|
| CN209892497U true CN209892497U (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920814335.5U Active CN209892497U (en) | 2019-05-31 | 2019-05-31 | First-stage impeller structure of multi-stage pump |
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| CN (1) | CN209892497U (en) |
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- 2019-05-31 CN CN201920814335.5U patent/CN209892497U/en active Active
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