Vertical single-stage pipeline centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a vertical single-stage pipeline centrifugal pump, which comprises a pump body, a motor, a limit component, an end cover, a support plate, an impeller and a positioning pipe, the end cover is arranged at the top of the pump body, the support plate is arranged at the top of the end cover, and the limit component comprises a first bearing, a first bearing lantern ring, a second bearing and a second bearing lantern ring. The impeller is rotationally connected into the pump body, the motor is arranged at the top of the supporting plate, an output shaft of the motor is in transmission connection with the top of the impeller, one end of the positioning pipe is in transmission connection with the impeller, the other end of the positioning pipe penetrates through the bottom of the pump body and an inner ring of the second bearing, and the output shaft of the motor, the impeller, the positioning pipe and the pump body are all subjected to filler sealing. Through the limiting effect of the limiting assembly on the assemblies needing to be rotated in the centrifugal pump, deviation generated during rotation of the assemblies is reduced, and therefore mutual abrasion between the assemblies can be reduced, and the service life of the centrifugal pump is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal pumps, and in particular to a vertical single-stage pipeline centrifugal pump. Background Art

[0002] The centrifugal pump works by using the rotation of the impeller to make the water centrifugal. Before starting the water pump, the pump casing and the water suction pipe must be filled with water, and then the motor is started, so that the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing.

[0003] At present, the Chinese utility model patent application with the publication date of May 2, 2023 and the publication number CN218953656U provides a vertical single-stage centrifugal pump, including a medium pump body, a pump cover, a vertical motor, a drive shaft and an impeller, which also includes a protective shell, a connecting flange is provided at the lower end of the protective shell and is bolted to the pump cover, and an arc-shaped top is provided at the upper end, a guide ring is provided in the middle of the arc-shaped top, and connecting ribs are provided between the guide ring and the arc-shaped top, and an air outlet channel is formed between the adjacent connecting ribs and the guide ring and the arc-shaped top; this utility model is provided with a protective shell on the outside of the vertical motor, which can be waterproof and dustproof, and has strong environmental adaptability. At the same time, an arc-shaped top is provided on the top of the protective shell, and the arc-shaped top can avoid water accumulation and a large amount of dust accumulation. A guide ring and an air outlet channel are also provided, and the hot air can be discharged upward from the inside of the guide ring, and then discharged from the air outlet along the arc-shaped top and the air outlet channel to avoid heat accumulation on the inner wall of the protective shell and cause temperature rise.

[0004] A vertical single-stage centrifugal pump in the related technology has a small deviation relative to the central axis of the driving shaft when the driving shaft drives the impeller to rotate at high speed due to installation errors of the various components of the centrifugal pump and the effect of water flow. Therefore, the impeller will generate additional pressure on the rotating seal between the impeller and the pump body, which will increase the friction between the impeller and the rotating seal and accelerate the wear rate of the rotating seal. Utility Model Content

[0005] The embodiment of the present application provides a vertical single-stage pipeline centrifugal pump, which can improve the technical problem existing in the related art that the wear speed of the rotary seal is accelerated due to a slight offset between the drive shaft and the impeller.

[0006] The embodiment of the present application provides a vertical single-stage pipeline centrifugal pump, including: a pump body, a motor, a limit assembly, an end cover, a support plate, an impeller and a positioning tube, the pump body is provided with a water inlet pipe and a water outlet pipe, the end cover is arranged on the top of the pump body and is bolted to the pump body, the support plate is arranged on the top of the end cover, the limit assembly includes a first bearing, a first bearing ring, a second bearing and a second bearing ring, the first bearing ring is bolted to the bottom of the support plate, the first bearing is arranged between the first bearing ring and the support plate, the second bearing ring is bolted to the bottom of the pump body, and the second bearing is arranged A first through hole is provided inside the pump body between the second bearing ring and the pump body, one end of the impeller is rotatably connected to the inside of the first through hole, the motor is arranged on the top of the support plate, the output shaft of the motor passes through the support plate, the inner ring of the first bearing and the end cover and is transmission-connected to the top of the impeller, a second through hole is provided at the bottom of the pump body, a plurality of openings are provided on the positioning tube, one end of the positioning tube is transmission-connected to an end of the impeller away from the motor, the other end of the positioning tube passes through the second through hole and the inner ring of the second bearing, and packing seals are performed between the output shaft of the motor, the impeller, the positioning tube and the pump body.

[0007] The above-mentioned technical scheme in the embodiment of the present application has at least the following technical effects: when the centrifugal pump is working, the output shaft of the motor drives the impeller and the positioning tube to rotate, and the liquid inside the impeller moves to the outside of the impeller under the action of centrifugal force and forms a pressure difference from the inside of the pump body to the outlet pipe, and the liquid is continuously transported from the water inlet pipe to the water outlet pipe. When the output shaft, impeller and positioning tube of the motor rotate, they will produce a slight offset relative to the central axis of the output shaft due to the installation errors of the components of the centrifugal pump and the effect of water flow. The first bearing and the second bearing can limit the output shaft, impeller and positioning tube, reduce the mutual wear between the sealing packing and the pump body caused by the offset during rotation, extend the service life of the centrifugal pump, and reduce the energy loss caused by friction when the centrifugal pump is working.

[0008] A vertical single-stage pipeline centrifugal pump provided in an embodiment of the present application reduces the deviation that occurs during rotation by limiting the components that need to rotate inside the centrifugal pump through a limiting component, thereby reducing the mutual wear between the components and extending the service life of the centrifugal pump.

[0009] In some embodiments, the output shaft of the motor is bolted to the impeller, a bayonet is also provided on the output shaft of the motor, a slot is provided at one end of the impeller away from the first through hole, and the bayonet is engaged in the slot.

[0010] In some embodiments, a base is provided at the bottom of the pump body, and the base is welded to the bottom of the pump body.

[0011] In some embodiments, a threaded hole is provided on the pump body, and a micro exhaust valve is also provided on the pump body, and an air inlet end of the micro exhaust valve is threadedly connected to the inside of the threaded hole.

[0012] In some embodiments, an observation port is provided on the end cover, and a protective net is provided inside the observation port.

[0013] In some embodiments, a protective cover is disposed on the top of the support plate, and a plurality of ventilation holes are opened on the protective cover.

[0014] In some embodiments, a plurality of waterproof edges are provided on the outer surface of the protective cover, and the waterproof edges are welded to the outer surface of the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the overall structure of a vertical single-stage pipeline centrifugal pump provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1 A magnified view of part A;

[0018] Figure 3 A cross-sectional view of a vertical single-stage pipeline centrifugal pump provided in an embodiment of the present application;

[0019] Figure 4 for Figure 3 A magnified view of part B;

[0020] Figure 5 for Figure 3 A magnified view of part C;

[0021] Figure 6 for Figure 3 Enlarged view of part D.

[0022] Among them, the reference numerals in the figure are:

[0023] 1. Pump body; 11. Water inlet pipe; 12. Water outlet pipe; 13. First through hole; 14. Second through hole; 15. Base; 16. Threaded hole; 17. Micro exhaust valve; 2. Motor; 31. First bearing; 32. First bearing ring; 33. Second bearing; 34. Second bearing ring; 4. End cover; 41. Observation port; 411. Protective net; 5. Support plate; 51. Protective cover; 511. Ventilation port; 512. Waterproof edge; 6. Impeller; 61. Slot; 7. Positioning tube; 71. Opening; 8. Pin. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0026] The centrifugal pump works by using the rotation of the impeller to make the water centrifugal. Before starting the water pump, the pump casing and the water suction pipe must be filled with water, and then the motor is started, so that the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing.

[0027] A vertical single-stage centrifugal pump in the related technology has a small deviation relative to the central axis of the driving shaft when the driving shaft drives the impeller to rotate at high speed due to installation errors of the various components of the centrifugal pump and the effect of water flow. Therefore, the impeller will generate additional pressure on the rotating seal between the impeller and the pump body, which will increase the friction between the impeller and the rotating seal and accelerate the wear rate of the rotating seal.

[0028] Based on this, in order to improve the problem in the related art that the wear speed of the rotary seal is accelerated due to a slight offset between the drive shaft and the impeller, the embodiment of the present application provides the following solution.

[0029] Please also read Figures 1 to 6 An embodiment of the present application provides a vertical single-stage pipeline centrifugal pump, including a pump body 1, a motor 2, a limit assembly, an end cover 4, a support plate 5, an impeller 6 and a positioning tube 7.

[0030] Please also read Figures 1 to 6The pump body 1 is provided with an inlet pipe 11 and an outlet pipe 12, which are integrally formed with the pump body 1. The end cover 4 is arranged on the top of the pump body 1 and is bolted to the pump body 1. The support plate 5 is arranged on the top of the end cover 4. The limiting assembly includes a first bearing 31, a first bearing ring 32, a second bearing 33 and a second bearing ring 34. The first bearing ring 32 is bolted to the bottom of the support plate 5. The first bearing 31 is arranged between the first bearing ring 32 and the support plate 5. The second bearing ring 34 is bolted to the bottom of the pump body 1. The second bearing 33 is arranged between the second bearing ring 34 and the pump body 1. A first through hole 13 is opened inside the pump body 1. One end of the impeller 6 is rotatably connected to the inside of the first through hole 13. The motor 2 is arranged on the top of the support plate 5. The output shaft of the motor 2 passes through the support plate 5, the inner ring of the first bearing 31 and the end cover 4 and is bolted to the impeller 6. A bayonet 8 is also provided on the output shaft of the motor 2. A slot 61 is provided at the end of the impeller 6 away from the first through hole 13, and the bayonet 8 is clamped inside the slot 61. A second through hole 14 is provided at the bottom of the pump body 1. A plurality of openings 71 are provided on the positioning tube 7. One end of the positioning tube 7 is transmission-connected to the end of the impeller 6 away from the motor 2. The other end of the positioning tube 7 passes through the second through hole 14 and the inner ring of the second bearing 33. The output shaft of the motor 2, the impeller 6, the positioning tube 7 and the pump body 1 are all packed with packing seals. A threaded hole 16 is provided on the pump body 1. A micro exhaust valve 17 is also provided on the pump body 1. The air inlet end of the micro exhaust valve 17 is threadedly connected inside the threaded hole 16.

[0031] As can be seen from the above, a vertical single-stage pipeline centrifugal pump provided in the embodiment of the present application needs to be ensured to be filled with liquid before the centrifugal pump is turned on. The staff can first unscrew the micro-exhaust valve 17 from the threaded hole 16, and inject liquid into the pump body 1 through the threaded hole 16 until the liquid fills the pump body 1. Then, the micro-exhaust valve 17 is screwed on and the power is turned on. The output shaft of the motor 2 rotates and drives the impeller 6 and the positioning tube 7 to rotate under the cooperation of the bayonet 8 and the slot 61. The liquid inside the impeller 6 starts to make centrifugal motion toward the outside of the impeller 6 under the drive of the impeller 6, thereby forming a pressure difference from the inside of the pump body 1 to the water outlet pipe 12. Under the action of the pressure difference, the liquid continuously enters the pump body 1 from the water inlet pipe 11, and then enters the impeller 6 through the opening 71 and the positioning tube 7. Since the liquid in the pipeline connected to the water inlet pipe 11 There may be a small amount of air in the pump body 1, which will gradually gather at the bottom of the end cover 4 after entering the pump body 1. When too much air gathers, the micro exhaust valve 17 will discharge the gathered air from the pump body 1 to prevent too much air from affecting the operation of the impeller 6 and thus reducing the working efficiency of the centrifugal pump. When the output shaft of the motor 2, the impeller 6 and the positioning tube 7 rotate, they will produce a slight offset relative to the central axis of the output shaft due to the installation errors of the components of the centrifugal pump and the effect of water flow. The first bearing 31 and the second bearing 33 can limit the output shaft, the impeller 6 and the positioning tube 7, reduce the mutual wear between the sealing packing and the pump body 1 caused by the offset during rotation, extend the service life of the centrifugal pump, reduce the energy loss caused by friction when the centrifugal pump is working, and also reduce the noise caused by rotational friction.

[0032] In some embodiments, please refer to Figure 1 and Figure 2 A base 15 is provided at the bottom of the pump body 1, and the base 15 is welded to the bottom of the pump body 1. A protective cover 51 is provided on the top of the support plate 5. A plurality of vents 511 are opened on the protective cover 51. A plurality of waterproof edges 512 are provided on the outer surface of the protective cover 51, and the waterproof edges 512 are welded to the outer surface of the protective cover 51.

[0033] With such arrangement, the base 15 can support the centrifugal pump and facilitate the installation of the centrifugal pump. When the centrifugal pump needs to be used outdoors or in a relatively harsh working environment, the protective cover 51 can prevent the motor 2 from contacting external liquids, and can also reduce the adhesion of external dust to the motor 2, thereby preventing the electronic components of the motor 2 from being shortened in service life or short-circuiting due to contact with liquids and dust. Since the motor 2 generates a large amount of heat when working, the vent 511 can accelerate the air circulation between the inside and outside of the protective cover 51, so that the heat generated by the motor 2 can be dissipated to the outside of the protective cover 51 in time, thereby preventing the temperature inside the protective cover 51 from being too high. The waterproof edge 512 can prevent rainwater from dripping from the vent 511 into the inside of the protective cover 51 and affecting the normal operation of the motor 2.

[0034] In some embodiments, please refer to Figure 1 and Figure 2 An observation port 41 is provided on the end cover 4 , and a protective net 411 is provided inside the observation port 41 .

[0035] With such arrangement, the staff can regularly observe the working condition inside the end cover 4 through the observation port 41 and perform maintenance work on the centrifugal pump in time when necessary. Since the output shaft of the motor 2 rotates at high speed when the centrifugal pump is working, if the staff touches the output shaft by mistake, it will cause damage to the staff. If any external foreign matter touches the output shaft, it will also cause certain danger. The protective net 411 can prevent the staff from accidentally touching the output shaft and prevent external foreign matter from contacting the output shaft.

[0036] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A vertical single-stage pipeline centrifugal pump, characterized in that: The invention comprises a pump body (1), a motor (2), a stopper assembly, an end cover (4), a support plate (5), an impeller (6) and a positioning tube (7); the pump body (1) is provided with a water inlet pipe (11) and a water outlet pipe (12); the water inlet pipe (11) and the water outlet pipe (12) are both integrally formed with the pump body (1); the end cover (4) is arranged at the top of the pump body (1) and is bolted to the pump body (1); the support plate (5) is arranged at the top of the end cover (4); the stopper assembly comprises a first bearing (31), a first bearing ring (32), a second bearing (33) and a second bearing ring (34); the first bearing ring (32) is bolted to the bottom of the support plate (5); the first bearing (31) is arranged between the first bearing ring (32) and the support plate (5); the second bearing ring (34) is bolted to the bottom of the pump body (1); the second bearing ring (3 ... ) is arranged between the second bearing ring (34) and the pump body (1), a first through hole (13) is provided inside the pump body (1), one end of the impeller (6) is rotatably connected inside the first through hole (13), the motor (2) is arranged on the top of the support plate (5), the output shaft of the motor (2) passes through the support plate (5), the inner ring of the first bearing (31) and the end cover (4) and is transmission-connected with the top of the impeller (6), a second through hole (14) is provided at the bottom of the pump body (1), a plurality of openings (71) are provided on the positioning tube (7), one end of the positioning tube (7) is transmission-connected with one end of the impeller (6) away from the motor (2), the other end of the positioning tube (7) passes through the second through hole (14) and the inner ring of the second bearing (33), and packing seals are provided between the output shaft of the motor (2), the impeller (6), the positioning tube (7) and the pump body (1).

2. A vertical single-stage pipeline centrifugal pump according to claim 1, characterized in that: The output shaft of the motor (2) is bolted to the impeller (6), a bayonet (8) is also provided on the output shaft of the motor (2), a bayonet groove (61) is provided at one end of the impeller (6) away from the first through hole (13), and the bayonet groove (61) is engaged with the bayonet pin (8).

3. A vertical single-stage pipeline centrifugal pump according to claim 2, characterized in that: The bottom of the pump body (1) is provided with a base (15), and the base (15) is welded to the bottom of the pump body (1).

4. A vertical single-stage pipeline centrifugal pump according to claim 3, characterized in that: The pump body (1) is provided with a threaded hole (16), and the pump body (1) is also provided with a micro exhaust valve (17), wherein the air inlet end of the micro exhaust valve (17) is threadedly connected to the inside of the threaded hole (16).

5. A vertical single-stage pipeline centrifugal pump according to any one of claims 1 to 4, characterized in that: The end cover (4) is provided with an observation port (41), and a protective net (411) is arranged inside the observation port (41).

6. A vertical single-stage pipeline centrifugal pump according to claim 5, characterized in that: A protective cover (51) is provided on the top of the support plate (5), and a plurality of ventilation holes (511) are provided on the protective cover (51).

7. A vertical single-stage pipeline centrifugal pump according to claim 6, characterized in that: A plurality of waterproof edges (512) are provided on the outer surface of the protective cover (51), and the waterproof edges (512) are welded to the outer surface of the protective cover (51).

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