CN116733751B - Multistage pump bi-pass structure and multistage centrifugal pump - Google Patents
Multistage pump bi-pass structure and multistage centrifugal pump Download PDFInfo
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- CN116733751B CN116733751B CN202310889152.0A CN202310889152A CN116733751B CN 116733751 B CN116733751 B CN 116733751B CN 202310889152 A CN202310889152 A CN 202310889152A CN 116733751 B CN116733751 B CN 116733751B
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- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000007789 sealing Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of centrifugal pumps, and particularly relates to a double-pass structure of a multistage pump and the multistage centrifugal pump, which comprise a cylinder, wherein a flange is coaxially and fixedly connected to the outer side of the middle part of the cylinder, an upper disc and a lower disc are coaxially and fixedly connected to the inner side of the middle part of the cylinder, the upper disc and the lower disc are oppositely arranged, and the upper disc and the lower disc are fixedly connected with the inner wall of the cylinder through bent blades; the cylinder, the upper disc and the curved blades of the upper disc enclose a reverse cavity; the cylinder, the lower disc and the curved blades of the lower disc enclose a positive cavity; two forward flow channels are symmetrically arranged in the forward cavity; two reverse flow channels are symmetrically arranged in the reverse cavity; the forward flow channels and the reverse flow channels are alternately arranged; the liquid enters through the forward flow channel and flows out through the reverse flow channel. The invention can greatly simplify the structure of the multistage pump, reduce the manufacturing cost and is convenient for installation and transportation.
Description
Technical Field
The invention belongs to the technical field of centrifugal pumps, and particularly relates to a double-pass structure of a multistage pump and the multistage centrifugal pump.
Background
The closed impeller centrifugal pump can generate axial force pointing to an inlet when in operation due to different areas and different pressures of cover plates on two sides of the impeller, the axial force is too large to influence the safe operation of a pump rotor, the service life of the pump rotor is shortened, and the multistage closed impeller centrifugal pump usually adopts an impeller symmetrical arrangement mode to balance the axial force.
The conventional multistage pump with the impellers symmetrically arranged often needs an external connection pipe or an external space runner to drain the medium from the forward impeller to the reverse impeller, and as a result, the pump body is clumsy, high in manufacturing cost and unfavorable for installation and transportation. The popularization and the application of the pump are affected. Therefore, a dual-pass structure of a multistage pump and a multistage centrifugal pump are needed to solve the problem.
Disclosure of Invention
The invention aims to provide a multi-stage pump double-pass structure and a multi-stage centrifugal pump so as to solve the problems.
In order to achieve the above object, the present invention provides the following solutions:
The utility model provides a multistage pump bi-pass structure, includes the drum, the coaxial rigid coupling in drum middle part outside has the flange, the coaxial rigid coupling in drum middle part inboard has last disc and lower disc, go up the disc with lower disc sets up relatively, go up the disc with lower disc all through crooked blade with drum inner wall rigid coupling;
the cylinder, the upper disc and the curved blades of the upper disc enclose a reverse cavity;
The cylinder, the lower disc and the curved blades of the lower disc enclose a forward cavity;
Two forward flow channels are symmetrically arranged in the forward cavity;
two reverse flow channels are symmetrically arranged in the reverse cavity;
the forward flow channels and the reverse flow channels are alternately arranged;
The liquid enters through the forward flow channel and flows out through the backward flow channel.
A multistage centrifugal pump based on the above-mentioned a multistage pump bi-pass structure includes: the multi-stage pump comprises a double-pass structure, an upper cylinder, a lower cylinder, a forward input assembly and a reverse output assembly;
the upper cylinder body and the lower cylinder body are respectively fixedly connected to two sides of the flange; the fixedly connected parts of the flange, the upper cylinder body and the lower cylinder body are respectively provided with a first sealing part;
The reverse output assembly is arranged in the upper cylinder;
The positive input assembly is arranged in the lower cylinder;
The reverse output assembly is in transmission connection with the forward input assembly through a pump shaft; the pump shaft is rotationally connected with the centers of the lower disc and the upper disc through a bearing shaft sleeve;
the liquid flows out after passing through the forward input assembly, the upper cylinder, the reverse output assembly and the lower cylinder in sequence.
Preferably, the forward input assembly comprises a plurality of forward input cylinders which are fixedly connected in sequence, the forward input cylinders are communicated in sequence, the top of the forward input cylinder at the top end is fixedly connected with the bottom of the cylinder, and the liquid outlet end of the forward input cylinder at the top end is communicated with the liquid inlet end of the forward flow channel;
The bottom of the forward input cylinder body positioned at the bottom end is fixedly connected with the inner wall of the lower cylinder body, and the forward input cylinder body is not communicated with the lower cylinder body;
A forward input part is arranged in each forward input cylinder body; and the positive input parts are in transmission connection with the pump shaft.
Preferably, the forward input part comprises a forward final stage impeller, the forward final stage impeller is fixedly connected with the pump shaft coaxially, a forward final stage guide vane is fixedly connected on the forward input cylinder body, and liquid is enabled to move from a liquid inlet end to a liquid outlet end of the forward input cylinder body through the cooperation of the forward final stage impeller and the forward final stage guide vane.
Preferably, the reverse output assembly comprises a plurality of reverse output cylinders which are fixedly connected in sequence, the reverse output cylinders are communicated in sequence, the reverse output cylinder at the bottom end is fixedly connected with the top of the cylinder, and the liquid outlet end of the reverse output cylinder at the bottom end is communicated with the liquid inlet end of the reverse flow channel;
The top of the reverse output cylinder body positioned at the top end is fixedly connected with the inner wall of the upper cylinder body, and the reverse output cylinder body is not communicated with the upper cylinder body;
a reverse output part is arranged in each reverse output cylinder body; and the reverse output parts are in transmission connection with the pump shaft.
Preferably, the reverse output part comprises a reverse final-stage impeller, the reverse final-stage impeller is fixedly connected with the pump shaft coaxially, a reverse final-stage guide vane is fixedly connected on the reverse output cylinder body, and the liquid is enabled to move from the liquid inlet end to the liquid outlet end of the reverse output cylinder body through the cooperation of the reverse final-stage impeller and the reverse final-stage guide vane.
Preferably, the first sealing part comprises a first O-shaped ring, and the first O-shaped ring is embedded and fixed in O-shaped ring grooves coaxially formed in the upper side and the lower side of the flange.
Compared with the prior art, the invention has the following advantages and technical effects:
when the multi-stage pump is used, liquid is pumped into the upper cylinder body through the multi-stage pump double-pass structure by the forward input assembly, the liquid enters the reverse output assembly through the upper cylinder body, the reverse output assembly continuously pressurizes the liquid, the liquid is pumped into the lower cylinder body through the multi-stage pump double-pass structure and finally flows out, the liquid is drained into the reverse output assembly from the forward input assembly through the multi-stage pump double-pass structure without an external connecting pipe or an external space runner, the multi-stage pump structure is greatly simplified, the manufacturing cost is reduced, and the multi-stage pump is convenient to install and transport.
Drawings
For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is a schematic diagram of a dual-pass structure of the multistage pump of the present invention;
FIG. 3 is a top view of a dual-pass structure of the multistage pump of the present invention;
FIG. 4 is a schematic view of the structure of the invention shown in section B-B in FIG. 3;
Wherein, 1, the cylinder body is input in the forward direction; 2. a lower cylinder; 3. a first O-ring; 4. a cylinder; 5. an upper cylinder; 6. a reverse output cylinder; 7. a second O-ring; 8. reverse last stage guide vanes; 9. a reverse final stage impeller; 10. a bearing sleeve; 11. a guide bearing; 12. forward last stage guide vanes; 13. a positive last stage impeller; 4-1, upper disc; 4-2, the upper end of the cylinder; 4-3, a spigot; 4-4, an O-shaped ring groove; 4-5, flanges; 4-6, a cylinder middle section; 4-7, the lower end of the cylinder; 4-8, a boss; 4-9, an inner cylindrical surface of the boss; 4-10, lower disc; 4-11, bending blade.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 4, the invention discloses a double-pass structure of a multistage pump, which comprises a cylinder 4, wherein a flange 4-5 is coaxially and fixedly connected to the outer side of the middle part of the cylinder 4, an upper disc 4-1 and a lower disc 4-10 are coaxially and fixedly connected to the inner side of the middle part of the cylinder 4, the upper disc 4-1 and the lower disc 4-10 are oppositely arranged, and the upper disc 4-1 and the lower disc 4-10 are fixedly connected with the inner wall of the cylinder through bent blades 4-11;
the cylinder 4, the upper disc 4-1 and the curved blades 4-11 of the upper disc 4-1 enclose a reverse cavity;
the cylinder 4, the lower disc 4-10 and the curved blades 4-11 of the lower disc 4-10 enclose a forward cavity;
Two forward flow channels are symmetrically arranged in the forward cavity;
Two reverse flow channels are symmetrically arranged in the reverse cavity;
the forward flow channels and the reverse flow channels are alternately arranged;
The liquid enters through the forward flow channel and flows out through the reverse flow channel.
A multistage centrifugal pump based on the above-mentioned a multistage pump bi-pass structure includes: the multistage pump double-pass structure, an upper cylinder 5, a lower cylinder 2, a forward input component and a reverse output component;
The upper cylinder body 5 and the lower cylinder body 2 are fixedly connected to two sides of the flange 4-5 respectively; the fixedly connected parts of the flanges 4-5 and the upper cylinder 5 and the lower cylinder 2 are respectively provided with a first sealing part;
the reverse output component is arranged in the upper cylinder body 5;
the forward input component is arranged in the lower cylinder 2;
The reverse output assembly and the forward input assembly are in transmission connection through a pump shaft; the pump shaft is rotationally connected with the centers of the lower disc 4-10 and the upper disc 4-1 through a bearing shaft sleeve 10;
The liquid flows out after passing through the forward input assembly, the upper cylinder 5, the reverse output assembly and the lower cylinder 2 in sequence.
When the multi-stage pump is used, liquid is pumped into the upper cylinder 5 through the multi-stage pump double-pass structure 4 by the forward input assembly, the liquid enters the reverse output assembly through the upper cylinder 5, the reverse output assembly continuously pressurizes the liquid, the liquid is pumped into the lower cylinder 2 through the multi-stage pump double-pass structure 4 and finally flows out, the liquid is drained from the forward input assembly to the reverse output assembly through the multi-stage pump double-pass structure 4 without an external connecting pipe or an external space runner, the multi-stage pump structure is greatly simplified, the manufacturing cost is reduced, and the installation and the transportation are convenient.
The cylinder 4, the upper disc 4-1, the curved blades 4-11 of the upper disc 4-1, the lower disc 4-10 and the curved blades 4-11 of the lower disc 4-10 are integrally formed.
The cylinder 4 is divided into a cylinder upper end 4-2, a cylinder middle section 4-6 and a cylinder lower end 4-7 from top to bottom.
The inner sides of the first sealing parts of the flanges 4-5 are respectively provided with a spigot 4-3, and the upper cylinder 5 and the lower cylinder 2 are respectively fixedly connected with the two sides of the flanges 4-5 through the spigot 4-3.
The upper cylinder 5 and the lower cylinder 2 are fixedly connected with the flange 4-5 through bolts.
Further, the bottom of the cylinder 4 is fixedly connected with one end of the forward input assembly; the fixedly connected part of the bottom of the cylinder 4 and the forward input assembly is sealed by a second sealing part; the top of the cylinder 4 is fixedly connected with one end of the reverse output assembly; the fixedly connected part of the top of the cylinder 4 and the reverse output assembly is sealed by another second sealing part.
According to a further optimization scheme, the forward input assembly comprises a plurality of forward input cylinders 1 which are fixedly connected in sequence, the forward input cylinders 1 are communicated in sequence, the top of the forward input cylinder 1 positioned at the top is fixedly connected with the bottom of the cylinder 4, and the liquid outlet end of the forward input cylinder 1 positioned at the top is communicated with the liquid inlet end of the forward flow channel;
the bottom of the forward input cylinder body 1 positioned at the bottom end is fixedly connected with the inner wall of the lower cylinder body 2, and the forward input cylinder body 1 and the lower cylinder body 2 are not communicated with each other;
A forward input part is arranged in each forward input cylinder body 1; the plurality of forward input parts are connected with the pump shaft in a transmission way.
According to a further optimization scheme, the forward input part comprises a forward final-stage impeller 13, the forward final-stage impeller 13 is fixedly connected with a pump shaft coaxially, a forward final-stage guide vane 12 is fixedly connected to the forward input cylinder body 1, and liquid is enabled to move from a liquid inlet end to a liquid outlet end of the forward input cylinder body 1 through the cooperation of the forward final-stage impeller 13 and the forward final-stage guide vane 12.
As shown in fig. 1, the invention is preferably 2 forward input cylinders 1, the forward final stage guide vanes 12 are fixedly connected to the top of the forward input cylinders 1, and the forward final stage guide vanes 12 of the forward input cylinders 1 positioned above are fixedly attached to the lower discs 4-10.
The liquid inlet end of the forward input cylinder body 1 positioned below is communicated with the liquid outlet end of the liquid main inlet pipeline.
A space for accommodating the forward final stage impeller 13 is arranged between the forward final stage guide vane 12 and the top of the forward input cylinder body 1, and liquid enters from the inside of the forward input cylinder body 1 under the action of the forward final stage impeller 13 and is pumped out from a plurality of liquid outlets arranged between the forward final stage guide vane 12 and the forward input cylinder body 1.
The liquid outlet between the upper positive final stage guide vane 12 and the positive input cylinder body 1 is communicated with the positive cavity, and enters the upper cylinder body 5 through the positive flow channels arranged on the two sides of the positive cavity.
Further optimizing scheme, the reverse output assembly comprises a plurality of reverse output cylinder bodies 6 which are fixedly connected in sequence, the reverse output cylinder bodies 6 at the bottom end are communicated in sequence, the reverse output cylinder body 6 at the bottom end is fixedly connected with the top of the cylinder 4, and the liquid outlet end of the reverse output cylinder body 6 at the bottom end is communicated with the liquid inlet end of the reverse runner;
The top of the reverse output cylinder body 6 positioned at the top end is fixedly connected with the inner wall of the upper cylinder body 5, and the reverse output cylinder body 6 is not communicated with the upper cylinder body 5;
a reverse output part is arranged in each reverse output cylinder body 6; the reverse output parts are in transmission connection with the pump shaft.
According to a further optimization scheme, the reverse output part comprises a reverse final-stage impeller 9, the reverse final-stage impeller 9 is fixedly connected with the pump shaft coaxially, a reverse final-stage guide vane 8 is fixedly connected to the reverse output cylinder body 6, and liquid is enabled to move from the liquid inlet end to the liquid outlet end of the reverse output cylinder body 6 through the cooperation of the reverse final-stage impeller 9 and the reverse final-stage guide vane 8.
As shown in fig. 1, the invention is preferably provided with 2 reverse output cylinders 6, wherein the reverse final stage guide vanes 8 are fixedly connected to the bottom of the reverse output cylinders 6, and the reverse final stage guide vanes 8 of the reverse output cylinders 6 positioned below are fixedly attached to the upper disc 4-1.
The liquid inlet end of the reverse output cylinder body 6 positioned above is communicated with the liquid outlet end of the upper cylinder body 5, and the liquid outlet end of the reverse output cylinder body 6 positioned at the bottom is communicated with the liquid inlet end of the lower cylinder body 2.
A space for accommodating the reverse final stage impeller 9 is arranged between the reverse final stage guide vane 8 and the top of the reverse output cylinder 6, and liquid enters from the interior of the reverse output cylinder 6 under the action of the reverse final stage impeller 9 and is pumped out through a plurality of liquid outlets arranged between the reverse final stage guide vane 8 and the reverse output cylinder 6.
The liquid outlet between the reverse final stage guide vane 8 positioned below and the reverse output cylinder body 6 is communicated with the reverse cavity, and enters the lower cylinder body 2 through reverse flow channels arranged on two sides of the reverse cavity.
In a further optimized scheme, the first sealing part comprises a first O-shaped ring 3, and the first O-shaped ring 3 is embedded and fixed in O-shaped ring grooves 4-4 coaxially formed in the upper side and the lower side of the flange 4-5.
Further, the second sealing part comprises a second O-ring 7, and the second O-ring 7 is respectively embedded and fixed on the top surface and the bottom surface of the cylinder 4.
The centers of the upper disc 4-1 and the lower disc 4-10 are provided with large round holes, the inner side of the upper disc 4-1 is provided with a boss 4-8, and the boss 4-8 is provided with a plurality of screw holes.
The bending blades 4-11 at the edges of the upper disc 4-1 and the lower disc 4-10 are alternately bent in the up-down direction to form two symmetrical forward flow passages A and two symmetrical reverse flow passages C, and the radial force can be avoided due to the symmetrical structure.
As shown in fig. 1, a flange 4-5 is fixedly connected with an upper cylinder 5 and a lower cylinder 2 through bolts, an O-shaped ring groove 4-4 is formed in the inner side of the two sides of the flange 4-5, and the flange is sealed with the upper cylinder 5 and the lower cylinder 2 through a first O-shaped ring 3; the inner side of the O-shaped ring groove 4-4 of the flange 4-5 is provided with a spigot 4-3, and the spigot 4-3 is positioned with the upper cylinder 5 and the lower cylinder 2; the outer circles of the upper disc 4-1 and the lower disc 4-10 are flat, the upper disc 4-1 is fixedly attached to the reverse final stage guide vane 8, and the lower disc 4-10 is fixedly attached to the forward final stage guide vane 12; the inner cylindrical surface 4-9 of the boss at the inner side of the boss 4-8 and the end surface of the boss 4-8 are fixed with a guide bearing 11 through screws, the guide bearing 11 and a bearing shaft sleeve 10 form a friction pair, and the pump shaft rotates with the upper disc 4-1 and the lower disc 4-10 through the guide bearing 11 and the bearing shaft sleeve 10.
The cylinder upper end 4-2 and the cylinder lower end 4-7 are positioned with the spigot provided on the reverse output cylinder 6 located below and the forward input cylinder 1 located above, respectively, and sealed by the second O-ring 7 provided at the spigot.
When the multistage pump works, liquid medium entering the pump body enters two forward flow channels A from the forward final stage impeller 13 and the forward final stage guide vane 12, enters a jacket cavity between the upper cylinder 5 and the reverse output cylinder 6 from the forward flow channels A, enters the reverse output cylinder 6 through an opening at the inner side of the top of the jacket cavity, enters two reverse flow channels C after passing through the reverse final stage impeller 9 and the reverse final stage guide vane 8, and flows out from the lower part of the jacket cavity formed between the lower cylinder 2 and the forward input cylinder 1.
As shown in fig. 3, the opening angle of the forward flow channel a is delta, the opening angle of the backward flow channel C is lambda, wherein lambda=delta, the value range of lambda or delta is 45-75 degrees, if the included angle is too small (< 45 degrees), when a conveying medium enters the multi-stage pump double-pass structure 4 from the final stage guide vane, the flow channel is suddenly changed from the circumference of 360 degrees into two forward flow channels a or backward flow channels C with the included angle lambda, and the flow resistance is large; on the contrary, when the medium flows out of the multi-stage pump double-pass structure 4, the flow channel is suddenly changed from the two forward flow channels A or the reverse flow channels C with the included angle lambda to a circumference of 360 degrees, the flow resistance is increased due to the sudden change of the flow channel sectional area and the included angle, and the pump efficiency is reduced. If the lambda and delta values are too large (> 75 degrees), the included angle of the connecting ribs between the forward flow channel A and the backward flow channel C is too small (included angle is 90 degrees-lambda < 15 degrees), so that the connection strength is low, and the parts are easy to damage.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A multistage centrifugal pump, characterized in that: comprises a multi-stage pump double-pass structure, an upper cylinder (5), a lower cylinder (2), a forward input component and a reverse output component;
The multistage pump double-pass structure comprises a cylinder (4), wherein a flange (4-5) is coaxially fixedly connected to the outer side of the middle of the cylinder (4), an upper disc (4-1) and a lower disc (4-10) are coaxially fixedly connected to the inner side of the middle of the cylinder (4), the upper disc (4-1) and the lower disc (4-10) are oppositely arranged, and the upper disc (4-1) and the lower disc (4-10) are fixedly connected with the inner wall of the cylinder through bent blades (4-11);
-said cylinder (4), said upper disc (4-1) and said curved blades (4-11) of said upper disc (4-1) enclose a counter chamber;
The cylinder (4), the lower disc (4-10) and the curved blades (4-11) of the lower disc (4-10) enclose a forward cavity;
Two forward flow channels are symmetrically arranged in the forward cavity;
two reverse flow channels are symmetrically arranged in the reverse cavity;
the forward flow channels and the reverse flow channels are alternately arranged;
The liquid enters through the forward flow channel and flows out through the backward flow channel;
the upper cylinder (5) and the lower cylinder (2) are respectively fixedly connected to two sides of the flange (4-5); the flange (4-5) is fixedly connected with the upper cylinder (5) and the lower cylinder (2) respectively and provided with a first sealing part;
The reverse output assembly is arranged in the upper cylinder (5);
the positive input assembly is arranged in the lower cylinder (2);
the reverse output assembly is in transmission connection with the forward input assembly through a pump shaft; the pump shaft is rotationally connected with the centers of the lower disc (4-10) and the upper disc (4-1) through a bearing shaft sleeve (10);
The liquid flows out after passing through the forward input assembly, the upper cylinder (5), the reverse output assembly and the lower cylinder (2) in sequence.
2. A multistage centrifugal pump according to claim 1, wherein: the positive input assembly comprises a plurality of positive input cylinders (1) which are fixedly connected in sequence, the positive input cylinders (1) are communicated in sequence, the top of the positive input cylinder (1) positioned at the top is fixedly connected with the bottom of the cylinder (4), and the liquid outlet end of the positive input cylinder (1) positioned at the top is communicated with the liquid inlet end of the positive flow channel;
The bottom of the forward input cylinder body (1) at the bottom end is fixedly connected with the inner wall of the lower cylinder body (2), and the forward input cylinder body (1) is not communicated with the lower cylinder body (2);
A forward input part is arranged in each forward input cylinder body (1); and the positive input parts are in transmission connection with the pump shaft.
3. A multistage centrifugal pump according to claim 2, wherein: the positive input part comprises a positive final-stage impeller (13), the positive final-stage impeller (13) is fixedly connected with the pump shaft coaxially, a positive final-stage guide vane (12) is fixedly connected on the positive input cylinder body (1), and liquid is enabled to move from the liquid inlet end to the liquid outlet end of the positive input cylinder body (1) through the cooperation of the positive final-stage impeller (13) and the positive final-stage guide vane (12).
4. A multistage centrifugal pump according to claim 1, wherein: the reverse output assembly comprises a plurality of reverse output cylinders (6) which are fixedly connected in sequence, the reverse output cylinders (6) are communicated in sequence, the reverse output cylinder (6) at the bottom end is fixedly connected with the top of the cylinder (4), and the liquid outlet end of the reverse output cylinder (6) at the bottom end is communicated with the liquid inlet end of the reverse flow channel;
The top of the reverse output cylinder body (6) positioned at the top end is fixedly connected with the inner wall of the upper cylinder body (5), and the reverse output cylinder body (6) is not communicated with the upper cylinder body (5);
a reverse output part is arranged in each reverse output cylinder body (6); and the reverse output parts are in transmission connection with the pump shaft.
5. A multistage centrifugal pump according to claim 4, wherein: the reverse output part comprises a reverse final-stage impeller (9), the reverse final-stage impeller (9) is fixedly connected with the pump shaft coaxially, a reverse final-stage guide vane (8) is fixedly connected to the reverse output cylinder body (6), and liquid is enabled to move from the liquid inlet end to the liquid outlet end of the reverse output cylinder body (6) through the cooperation of the reverse final-stage impeller (9) and the reverse final-stage guide vane (8).
6. A multistage centrifugal pump according to claim 1, wherein: the first sealing part comprises a first O-shaped ring (3), and the first O-shaped ring (3) is embedded and fixed in O-shaped ring grooves (4-4) coaxially formed in the upper side and the lower side of the flange (4-5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310889152.0A CN116733751B (en) | 2023-07-19 | 2023-07-19 | Multistage pump bi-pass structure and multistage centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310889152.0A CN116733751B (en) | 2023-07-19 | 2023-07-19 | Multistage pump bi-pass structure and multistage centrifugal pump |
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| CN116733751B true CN116733751B (en) | 2024-05-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200964953Y (en) * | 2006-10-28 | 2007-10-24 | 浙江佳力科技股份有限公司 | Horizontal split multi-stage diffuser pump |
| CN102619780A (en) * | 2012-04-26 | 2012-08-01 | 朱学斌 | Centrifugal pump for balancing axial force of reversely-arranged last-stage impeller |
| CN107559206A (en) * | 2017-10-13 | 2018-01-09 | 嘉利特荏原泵业有限公司 | First-stage double-absorption structure Double-casing symmetrical expression radial direction subdivision centrifugal multistage pump multiple centrifugal pump |
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| CN200964953Y (en) * | 2006-10-28 | 2007-10-24 | 浙江佳力科技股份有限公司 | Horizontal split multi-stage diffuser pump |
| CN102619780A (en) * | 2012-04-26 | 2012-08-01 | 朱学斌 | Centrifugal pump for balancing axial force of reversely-arranged last-stage impeller |
| CN107559206A (en) * | 2017-10-13 | 2018-01-09 | 嘉利特荏原泵业有限公司 | First-stage double-absorption structure Double-casing symmetrical expression radial direction subdivision centrifugal multistage pump multiple centrifugal pump |
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