CN114001033A - Axial liquid inlet structure and multistage centrifugal pump with same - Google Patents
Axial liquid inlet structure and multistage centrifugal pump with same Download PDFInfo
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- CN114001033A CN114001033A CN202111279067.XA CN202111279067A CN114001033A CN 114001033 A CN114001033 A CN 114001033A CN 202111279067 A CN202111279067 A CN 202111279067A CN 114001033 A CN114001033 A CN 114001033A
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- main shaft
- liquid inlet
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- axial
- liquid
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- 239000007788 liquid Substances 0.000 title claims abstract description 137
- 239000000725 suspension Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000010276 construction Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/049—Roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2216—Shape, geometry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Abstract
The invention relates to an axial liquid inlet structure and a multistage centrifugal pump with the same. The axial liquid inlet structure comprises a pump body; the pump body comprises a liquid inlet part, a main shaft and a suspension; the liquid inlet part is positioned at one end of the pump body, the suspension is positioned at the other end, and one end of the main shaft is rotatably connected to the suspension; the liquid inlet part is provided with a liquid inlet along the extension direction of the main shaft, an auxiliary bearing is fixedly arranged on the inner side wall of the liquid inlet, and the other end of the main shaft penetrates through the suspension and is rotatably connected with the auxiliary bearing. The main shaft can be supported at two sides by the suspension and the auxiliary bearing which are respectively in rotating connection with the main shaft, so that the stability of the main shaft in a working state is improved; in addition, set up the inlet along the extending direction of main shaft for the main shaft begins to rotate the back, is carried liquid and all gets into the pump body along the axial, makes the intraoral passageway equilibrium degree of inlet higher, does not have the position that cavitation performance is relatively poor, and then reaches the effect that increases the cavitation performance of the pump body.
Description
Technical Field
The invention relates to the field related to water pumps, in particular to an axial liquid inlet structure and a multistage centrifugal pump with the axial liquid inlet structure.
Background
Most of the existing single-stage centrifugal pumps adopt a cantilever support structure, namely axial liquid inlet and radial liquid outlet; the length of the main shaft of the multistage centrifugal pump is long, and if a cantilever supporting structure is adopted, the distance between the liquid inlet end of the multistage centrifugal pump and a cantilever is too large, so that the radial stability of the main shaft at the liquid inlet end is poor; therefore, most of the existing multistage centrifugal pumps adopt a structure of radial liquid inlet and radial liquid outlet, so that the main shaft can be supported by bearings on two sides, and the radial stability of the longer main shaft is ensured.
However, when liquid is fed in the radial direction, the pressure between the liquid and the inner wall of the pump body is different according to the difference between the distance between the inner wall of the pump body connected with the liquid inlet and the radial liquid inlet, so that the channel balance degree is lower, the cavitation performance of part of positions is poorer, and the cavitation performance of the radial liquid feeding is lower.
The existing multistage centrifugal pump mainly considers the flow rate during design, and the design priority of the cavitation performance is relatively low, so that the traditional radial liquid inlet and outlet structure is mainly and directly adopted.
Disclosure of Invention
Therefore, it is necessary to provide an axial liquid inlet structure with high cavitation performance and a multistage water pump with the axial liquid inlet structure, aiming at the problem that the radial liquid inlet cavitation performance of the multistage water pump is poor.
The invention firstly provides an axial liquid inlet structure, which comprises a pump body; the pump body comprises a liquid inlet part, a main shaft and a suspension; the liquid inlet part is positioned at one end of the pump body, the suspension is positioned at the other end, and one end of the main shaft is rotatably connected to the suspension; the liquid inlet part is provided with a liquid inlet along the extension direction of the main shaft, an auxiliary bearing is fixedly arranged on the inner side wall of the liquid inlet, and the other end of the main shaft penetrates through the suspension and is rotatably connected with the auxiliary bearing.
The axial liquid inlet structure is respectively in rotating connection with the main shaft through the suspension and the auxiliary bearing, so that the main shaft can be supported on two sides, and the stability of the main shaft in a working state is improved; in addition, set up through the extending direction with the inlet along the main shaft for the main shaft begins to rotate the back, is carried liquid and all gets into the pump body along the axial, makes the intraoral passageway equilibrium degree of inlet higher, and the cavitation performance homogeneous phase of each position is the same or similar, does not have the relatively poor position of cavitation performance, and then reaches the effect that increases the cavitation performance of the pump body.
In one embodiment, the auxiliary bearing is arranged at the center of the liquid inlet.
So set up, guarantee at the main shaft rotation in-process, the feed liquor of each position of inlet is even, reaches the effect that increases the cavitation performance of the pump body.
In one embodiment, the auxiliary bearing is a plain bearing.
So set up, offset the axial skew that the main shaft rotation in-process produced through slide bearing, further increase the stability of main shaft.
In one embodiment, the auxiliary bearing is a water lubricated bearing.
The arrangement is adopted, so that when the conveyed liquid is condensed water, lubricating oil of other sliding bearings is prevented from leaking and polluting the condensed water.
In one embodiment, the auxiliary bearing is fixedly connected with the inner side wall of the liquid inlet through a connecting piece.
In one embodiment, the number of the connecting pieces is three, and the connecting pieces are uniformly distributed in the circumferential direction by taking the main shaft as a center.
By the arrangement, on one hand, the auxiliary bearing is firmly fixed, so that the stability of the main shaft in the rotating process is further improved; on the other hand, the gap between the connecting piece and the inner wall of the liquid inlet is circumferentially and uniformly distributed by taking the main shaft as the center, so that the channel balance degree is increased, and the cavitation performance of the pump body is improved.
In one embodiment, the main shaft is connected to the suspension by at least two sets of bearings.
The arrangement ensures that the main shaft can be supported by at least two points in the suspension, so that the stability of the main shaft during rotation is further improved by increasing the number of supporting points of the main shaft.
In one embodiment, one set of the bearings is arranged at one end of the suspension close to the liquid inlet part, and the other set of the bearings is arranged at one end of the suspension far away from the liquid inlet part.
So set up for the arrangement of the strong point of auxiliary bearing and two sets of bearings is as even as possible, thereby reaches the effect that improves the support stability to the main shaft.
In one embodiment, one group of the bearings at one end of the suspension close to the liquid inlet part is a deep groove ball bearing, and the other group of the bearings at the other end is two angular contact ball bearings.
The invention provides a multistage centrifugal pump, which comprises the axial liquid inlet structure.
Drawings
FIG. 1 is a schematic sectional view in elevation of a multistage centrifugal pump according to the present invention;
FIG. 2 is an enlarged schematic view of the liquid inlet portion of FIG. 1;
FIG. 3 is a schematic left side view of the structure of FIG. 1;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1;
fig. 5 is an enlarged schematic view of the structure at B in fig. 4.
Description of the main elements
100. A pump body; 10. a liquid inlet part; 11. a liquid inlet; 20. a pressurization part; 21. an impeller; 22. a middle section shell; 30. a main shaft; 31. an auxiliary bearing; 311. a sliding bearing pair; 312. a sliding bearing; 313. a gap; 32. a connecting member; 33. a flow guiding space; 34. a baffle plate; 40. a suspension; 41. a deep groove ball bearing; 42. angular contact ball bearings; 50. a water pipe.
The present invention is described in further detail with reference to the drawings and the detailed description.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
At present, for a centrifugal pump with a short main shaft length, such as a single-stage or double-stage centrifugal pump, the main shaft is mostly fixed through a cantilever support structure, a cantilever is used as a support end, one end of the main shaft is connected with the cantilever through a bearing seat, and the other end of the main shaft is arranged in a suspended manner, so that a liquid inlet can be arranged at the suspended end of the main shaft and arranged along the main shaft direction, namely, liquid is fed in a radial direction;
for a multistage centrifugal pump with a long main shaft, if the main shaft is arranged by adopting a cantilever support structure, the main shaft has a long length, and after the main shaft starts to rotate at a high speed, the stability of a suspended part of the main shaft is poor, so that the main shaft can generate radial run-out or deviation;
therefore, most of the existing multistage centrifugal pumps adopt a structure of radial liquid inlet and radial liquid outlet, such as CN1641224, both ends of a main shaft of the existing multistage centrifugal pumps are connected with a pump body through bearing seats, and a liquid inlet and a liquid outlet are radially formed and are positioned between the two bearing seats so as to ensure the stability of the main shaft in the working process through the support of the two bearing seats;
however, in the radial liquid inlet process, because the lengths of the flowing paths at the two sides of the main shaft at the liquid inlet are different, the flow velocity of the liquid at the side of the main shaft far away from the liquid inlet is higher than that of the liquid at the side of the main shaft close to the liquid inlet, so that the pressure at the side of the main shaft far away from the liquid inlet is relatively low, and the cavitation performance is poor (cavitation is generated when the pressure at the lowest point of the pressure in the pump body is lower than the saturated vapor pressure of the liquid to be conveyed at the temperature);
in the design and manufacture process of the conventional multistage centrifugal pump, on one hand, the liquid flow and the efficiency are mainly considered, and the design priority of the cavitation performance is relatively low;
on the other hand, the cavitation performance of the pump body relates to fluid dynamic conditions, mechanical impact, the types and components of materials of flow passage components, the electrochemical interaction between the surface of the material and liquid and other aspects, and is complex, so that the problem that the cavitation performance of the pump body is influenced by a radial liquid inlet structure of the traditional multistage centrifugal pump is difficult to find;
therefore, most of the existing multistage centrifugal pumps are still in a traditional radial liquid inlet and radial liquid outlet structure.
In view of the above problems, the present application first provides an axial liquid inlet structure, which includes a pump body 100; the pump body 100 includes a liquid inlet 10, a main shaft 30, and a suspension 40; the liquid inlet part 10 is positioned at one end of the pump body 100, the suspension 40 is positioned at the other end, and one end of the main shaft 30 is rotatably connected to the suspension 40; the liquid inlet part 10 is provided with a liquid inlet 11 along the extension direction of the main shaft 30, the inner side wall of the liquid inlet 11 is fixedly provided with an auxiliary bearing 31, and the other end of the main shaft 30 penetrates through the suspension 40 to be rotatably connected with the auxiliary bearing 31.
The suspension 40 and the auxiliary bearing 31 are respectively connected with the main shaft 30 in a rotating way, so that the main shaft 30 can be supported at two sides, and the stability of the main shaft 30 in a working state is improved; on this basis, connect respectively in the both ends of main shaft 30 through suspension 40 and auxiliary bearing 31 for the both ends of main shaft 30 all obtain the support, and there is not the suspended portion in main shaft 30 promptly, thereby guarantee that main shaft 30 can not take place radial vibration or skew in the rotation process, increase the stability under the main shaft 30 operating condition.
In addition, the liquid inlet 11 is arranged along the extending direction of the main shaft 30, so that after the main shaft 30 starts to rotate, the conveyed liquid enters the pump body 100 along the axial direction, that is, the flow paths of the conveyed liquid are the same, the conveyed liquid uniformly flows in, the channel balance degree in the liquid inlet 11 is higher, the cavitation performance of each position is the same or similar, no position with relatively poor cavitation performance exists, and the effect of improving the cavitation performance of the pump body 100 is achieved.
In the embodiment shown in fig. 1, the auxiliary bearing 31 is disposed at the center of the liquid inlet 11, so that the axial projection of the main shaft 30 is located at the center of the liquid inlet 11, and it is ensured that the liquid inlet at each position of the liquid inlet 11 is uniform during the rotation of the main shaft 30, thereby avoiding the occurrence of the situation of high flow rate and poor cavitation performance at some positions due to uneven liquid inlet, and achieving the effect of improving the cavitation performance of the pump body 100.
In the embodiment shown in fig. 1, the auxiliary bearing 31 is a sliding bearing, so as to counteract the axial offset generated during the rotation of the main shaft 30, further increasing the stability of the main shaft 30; the type of the sliding bearing may be determined according to the type of the liquid to be conveyed, and it is preferable that the auxiliary bearing 31 is a water-lubricated bearing to prevent the lubricating oil of other types of sliding bearings from leaking and contaminating the condensed water when the liquid to be conveyed is the condensed water.
In the embodiment shown in FIG. 2, the auxiliary bearing 31 is fixedly connected to the inner sidewall of the liquid inlet 11 through a connector 32, a gap is formed between the connector 32 and the inner wall of the liquid inlet 11 for the liquid to be conveyed to normally pass through, and the connector 32 and the inner wall of the liquid inlet 11 can be fixed by common fixing methods such as welding, bolting, integral molding and casting. Preferably, the connecting member 32 is fixed to the inner wall of the loading port 11 by welding.
In some embodiments, the connecting pieces 32 are provided in plurality and are circumferentially and uniformly distributed by taking the main shaft 30 as a center, so that on one hand, the auxiliary bearing 31 is ensured to be firmly fixed, and the stability of the main shaft 30 in the rotating process is further improved;
on the other hand, the gap between the connecting piece 32 and the inner wall of the liquid inlet 11 is circumferentially and uniformly distributed by taking the main shaft 30 as the center, so that the conveyed liquid can uniformly enter the pump body 100 when entering the liquid through the liquid inlet 11, thereby avoiding the conditions of higher flow velocity and poorer cavitation performance of part of the positions caused by uneven liquid inlet, and achieving the effect of increasing the cavitation performance of the pump body 100.
In the embodiment shown in fig. 3, three connecting members 32 are provided, and are circumferentially and uniformly arranged around the main shaft 30.
In the embodiment shown in fig. 1, the main shaft 30 is connected to the suspension 40 through at least two sets of bearings to ensure that the main shaft 30 can be supported at least two points in the suspension 40, so as to further improve the stability of the main shaft 30 during rotation by increasing the number of supporting points of the main shaft 30;
considering the stability and cost increasing range after the number of bearings is increased, it is preferable that the main shaft 30 is connected to the suspension 40 through two sets of bearings.
One set of bearings is arranged at one end of the suspension 40 close to the liquid inlet part 10, the other set of bearings is arranged at one end of the suspension 40 far away from the liquid inlet part 10, and as the distance between the auxiliary bearing 31 and the suspension 40 is usually larger than the length of the suspension 40, the distance between the two sets of bearings can be increased as much as possible by respectively arranging the two sets of bearings at two ends of the suspension 40, and the distance is made to be as close as possible to the distance between the auxiliary bearing 31 and the bearing positioned in the middle, so that the arrangement of the supporting points of the auxiliary bearing 31 and the two sets of bearings is made to be as uniform as possible, and the effect of improving the supporting stability of the main shaft 30 is achieved.
The bearing may be a cylindrical bearing, a sliding bearing, a ball bearing or other common rotating connecting parts, and the application is not limited herein. Preferably, the main shaft 30 is connected to the suspension 40 through ball bearings, and a set of bearings located at one end of the suspension 40 near the liquid inlet 10 is a deep groove ball bearing 41, and a set of bearings located at the other end is two angular contact ball bearings 42.
The two angular contact ball bearings 42 are mounted with the wide end faces facing the wide end faces to bear a large radial load, and restrict axial displacement of the main shaft 30 in two directions to increase axial stability of the main shaft 30.
The invention also provides a multistage centrifugal pump which comprises the axial liquid inlet structure in any embodiment.
In the embodiment shown in fig. 1 and 4, the multistage centrifugal pump further comprises a pressure increasing section 20, the pressure increasing section 20 being located between the liquid intake section 10 and the suspension 40; the auxiliary bearing 31 comprises a sliding bearing pair 311 and a sliding bearing 312, wherein the sliding bearing pair 311 is fixed with the connecting piece 32, and one end of the main shaft 30 is connected with the sliding bearing 312; the pump body 100 further includes a water pipe 50, one end of the water pipe 50 is communicated with the pressurizing part 20, and the other end is communicated with a gap 313 between the sliding bearing pair 311 and the sliding bearing 312.
Here, the pressurizing portion 20 serves to pressurize the liquid to be conveyed entering the pressurizing portion 20. The liquid to be delivered enters the pump body 100 through the liquid inlet part 10, is pressurized under the action of the pressurization part 20 after entering the pressurization part 20, and is delivered to other structures of the pump body 100.
One end of the water pipe 50 is communicated with the pressurizing part 20, and the other end is communicated with the gap 313, so that the part of the liquid to be conveyed after being pressurized by the pressurizing part 20 can be flushed into the gap 313 through the water pipe 50 and flows into the liquid inlet part 10 again from the gap 313; and in the process of rotating the main shaft 30, heat generated by friction between the sliding bearing 312 and the sliding bearing pair 311 can be taken away together through flowing high-pressure liquid, so that the situation that the part expands with heat and contracts with cold due to heat accumulation in the gap 313 and the gap 313 disappears due to expansion of the part is avoided, and the effect of cooling the sliding bearing 312 in real time to ensure the normal operation of the sliding bearing is achieved.
In the embodiment shown in fig. 1 and 4, the pressurizing part 20 includes a plurality of impellers 21 arranged along the extending direction of the main shaft 30, a through-flow space is formed between the impellers 21 and the inner side wall of the pump body 100, and the water pipe 50 is communicated with the through-flow space.
For convenience of description, the impeller 21 closest to the liquid intake portion 10 is defined herein as the first-stage impeller.
Specifically, the impellers 21 are all fixedly connected with the main shaft 30, the water inlets of the impellers 21 are arranged in the direction of the liquid inlet part 10, the water outlets are arranged in the radial direction, the main shaft 30 can drive the impellers 21 to rotate when rotating, so that the liquid to be conveyed entering the impellers 21 is pressurized and thrown out to the next-stage impeller 21 through the rotation of the impellers 21, the above processes are repeated until the liquid to be conveyed leaves the pressurizing part 20, and the pressurizing conveying effect of the pressurizing part 20 is realized.
The pressurizing part 20 is composed of a plurality of hollow middle-section shells 22, each impeller 21 corresponds to one middle-section shell 22, the impellers 21 are arranged in the middle-section shells 22, a through-flow space is formed between the impellers 21 and the inner side wall of the middle-section shell 22, and the through-flow space is used for guiding liquid to be conveyed, so that the liquid flowing out of a water outlet of the impeller 21 can enter a water inlet of the next-stage impeller under the guiding action of the through-flow space.
Preferably, the corner positions of the through-flow space are all rounded corners to ensure that the liquid to be conveyed can naturally turn in the flowing process, and the liquid turbulence caused by the direct collision of the liquid and the side wall of the through-flow space is avoided.
In addition, the arrangement of the plurality of middle section housings 22 enables the corresponding middle section housing 22 to be disassembled and the corresponding wearing parts to be replaced when the wearing parts such as the sealing rings, the shaft seals and the like in the middle section housing 22 are damaged, the middle section housing 22 and the impeller 21 can still be continuously used, and time and cost required by repair are greatly saved.
The water pipe 50 is communicated with a through-flow space, namely the through-flow space between the middle section shell 22 and the impeller 21 at any stage is communicated with the water pipe 50;
when the liquid to be conveyed enters the corresponding through-flow space through the first-stage impeller 21, the first pressurization is completed, and the subsequent impeller 21 can further pressurize the liquid to be conveyed so as to meet different requirements. Therefore, it can be understood that the liquid to be conveyed entering any through-flow space is the liquid which is pressurized at least once, and the liquid entering the water pipe 50 can be ensured to be the pressurized liquid by communicating the water pipe 50 with the through-flow space, so as to meet the subsequent cooling requirement.
Preferably, the through-flow space of the first-stage impeller 21 is communicated with the water pipe 50, and the liquid pressurized by the first-stage impeller 21 is enough to meet the cooling requirement of the sliding bearing 312 in most cases; since the pressurized liquid needs to be pressurized again after passing through the gap 313, that is, the original pressure energy of the liquid is consumed after passing through the gap 313, the higher the initial pressure of the liquid for cooling, the higher the energy consumption for cooling;
it will be appreciated that, given the same cooling effect, the option of connecting the water pipe 50 to the through-flow space of the other impeller 21 increases the energy consumption for cooling the plain bearing 312, thereby reducing the overall operating efficiency of the pump body 100.
Of course, if there is a special case that the rotation speed of the main shaft 30 is high or the speed of friction heat generation is high, the water pipe 50 may be connected to the through-flow space of the other impeller 21 to obtain a higher liquid flow rate and increase the cooling effect on the sliding bearing 312, which is not limited in this application.
In addition, since the first-stage impeller 21 is the impeller 21 closest to the liquid inlet portion 10, the length required for the water pipe 50 can be reduced by communicating the through-flow space of the water pipe 50 and the first-stage impeller 21, which reduces the production cost on the one hand and reduces the possibility of accidental damage to the water pipe 50 on the other hand.
In the embodiment shown in fig. 5, the end of the sliding bearing pair 311 away from the pressurizing part 20 is fixedly provided with the baffle 34, and the end of the water pipe 50 is fixedly provided with the baffle 34. The baffle 34 is used for blocking the liquid to be conveyed which enters the pump body 100 through the liquid inlet 11, so as to prevent the liquid to be conveyed from directly entering the gap 313 to be mixed with the high-pressure liquid flushed out through the water pipe 50, so that the liquid pressure is reduced, and the cooling effect on the sliding bearing 312 is influenced;
in addition, a flow guide space 33 is formed among the baffle 34, the end surface of the main shaft 30 and the inner side wall of the sliding bearing pair 311, the flow guide space 33 is communicated with the gap 313, the included angle in the flow guide space 33 is chamfered, after the high-pressure liquid in the water pipe 50 enters the flow guide space 33, the high-pressure liquid flows out through the gap 313 between the sliding bearing 312 and the sliding bearing pair 311, and meanwhile, in the process of flowing out through the gap 313, heat generated by the rotation friction of the main shaft 30 is taken away together, so that the effect of cooling the sliding bearing 312 is achieved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An axial liquid inlet structure is characterized by comprising a pump body (100);
the pump body (100) comprises a liquid inlet part (10), a main shaft (30) and a suspension (40);
the liquid inlet part (10) is positioned at one end of the pump body (100), the suspension (40) is positioned at the other end, and one end of the main shaft (30) is rotatably connected to the suspension (40);
liquid inlet (14) have been seted up along main shaft (30) extending direction in liquid portion (10), auxiliary bearing (31) have set firmly to the inside wall of liquid inlet (14), the other end of main shaft (30) run through suspension (40) to with auxiliary bearing (31) rotate and be connected.
2. Axial inlet construction according to claim 1, characterized in that the auxiliary bearing (31) is arranged in the centre of the inlet opening (14).
3. Axial admission structure according to claim 1, characterized in that the auxiliary bearing (31) is a plain bearing.
4. Axial intake structure according to claim 3, wherein the auxiliary bearing (31) is a water lubricated bearing.
5. The axial inlet construction according to claim 1, characterized in that the auxiliary bearing (31) is fixedly connected with the inner side wall of the inlet (14) by a connecting piece (32).
6. The axial intake structure of claim 5, wherein there are three connecting pieces (32) circumferentially and uniformly arranged around the main shaft (30).
7. Axial inlet construction according to claim 1, characterized in that the main shaft (30) is connected to the suspension (40) by at least two sets of bearings.
8. The axial intake structure of claim 7, wherein one set of the bearings is disposed at an end of the hanger bracket (40) close to the intake portion (10), and the other set of the bearings is disposed at an end of the hanger bracket (40) far from the intake portion (10).
9. The axial intake structure of claim 8, wherein the set of bearings at one end of the suspension (40) near the intake (10) is a deep groove ball bearing (41), and the set of bearings at the other end is two angular contact ball bearings (42).
10. A multistage centrifugal pump comprising an axial feed-through structure as claimed in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111279067.XA CN114001033A (en) | 2021-10-31 | 2021-10-31 | Axial liquid inlet structure and multistage centrifugal pump with same |
| PCT/CN2021/131229 WO2023070766A1 (en) | 2021-10-31 | 2021-11-17 | Axial liquid intake structure and multi-stage centrifugal pump having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111279067.XA CN114001033A (en) | 2021-10-31 | 2021-10-31 | Axial liquid inlet structure and multistage centrifugal pump with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114001033A true CN114001033A (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111279067.XA Pending CN114001033A (en) | 2021-10-31 | 2021-10-31 | Axial liquid inlet structure and multistage centrifugal pump with same |
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| Country | Link |
|---|---|
| CN (1) | CN114001033A (en) |
| WO (1) | WO2023070766A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023070765A1 (en) * | 2021-10-31 | 2023-05-04 | 浙江水泵总厂有限公司 | Bearing cooling structure, and condensate water pump having same |
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| CN203926033U (en) * | 2014-05-29 | 2014-11-05 | 长沙佳能通用泵业有限公司 | The horizontal multi-stage centrifugal pump of a kind of end water sucting belt inducer |
| CN104329261A (en) * | 2014-10-22 | 2015-02-04 | 江苏振华泵业制造有限公司 | High temperature distilled water circulating pump |
| CN109185217A (en) * | 2018-11-28 | 2019-01-11 | 无锡艾比德泵业有限公司 | A kind of suction inlet is the water inlet segment structure of the centrifugal multistage pump multiple centrifugal pump of fish mouth type |
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| WO2023070765A1 (en) * | 2021-10-31 | 2023-05-04 | 浙江水泵总厂有限公司 | Bearing cooling structure, and condensate water pump having same |
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| Publication number | Publication date |
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| WO2023070766A1 (en) | 2023-05-04 |
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