阅读说明：本技术 一种带大推力水润滑轴承结构的潜水贯流泵排水系统 (Submersible tubular pump drainage system with high-thrust water-lubricated bearing structure ) 是由 金雷 梁樑 胡薇 朱庆龙 钱凤辉 舒雪辉 王诚成 赵伟龙 孔令杰 徐宇翔 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种带大推力水润滑轴承结构的潜水贯流泵排水系统,包括排水管路以及设置在排水管路内的潜水贯流泵,所述潜水贯流泵的进水室与排水管路的下游端的第一流道相连,所述潜水贯流泵的导叶体与排水管路的上游端的第二流道相连,所述第一流道以及第二流道呈沿远离潜水贯流泵方向逐渐外扩的喇叭口状。本发明由于进水室、叶轮部以及导叶体的分体式铸造,便于加工制造、组装、拆卸,方便了贯流泵的分步安装,同时提高了主轴的强度及刚度,进而提高机组的安全可靠性；由于整个装置不受密封性能的限制,大型化的整体结构可承受达100吨的推力；铸造完成的潜水贯流泵安装在排水管路中后,满足了排水系统大流量的流体输送需求。(The invention discloses a submersible tubular pump drainage system with a high-thrust water-lubricated bearing structure, which comprises a drainage pipeline and a submersible tubular pump arranged in the drainage pipeline, wherein a water inlet chamber of the submersible tubular pump is connected with a first flow channel at the downstream end of the drainage pipeline, a guide vane body of the submersible tubular pump is connected with a second flow channel at the upstream end of the drainage pipeline, and the first flow channel and the second flow channel are in a horn mouth shape gradually expanding outwards along the direction far away from the submersible tubular pump. The invention is convenient for processing, manufacturing, assembling and disassembling due to the split casting of the water inlet chamber, the impeller part and the guide vane body, facilitates the step-by-step installation of the tubular pump, and simultaneously improves the strength and the rigidity of the main shaft, thereby improving the safety and the reliability of the unit; because the whole device is not limited by the sealing performance, the large-scale integral structure can bear the thrust of 100 tons; after the submerged tubular pump which is cast is installed in a drainage pipeline, the requirement of large-flow fluid delivery of a drainage system is met.)

1. The submersible tubular pump drainage system with the high-thrust water lubrication bearing structure is characterized by comprising a drainage pipeline (5) and a submersible tubular pump arranged in the drainage pipeline (5), wherein a water inlet chamber (11) of the submersible tubular pump is connected with a first flow channel (53) at the downstream end of the drainage pipeline (5), a guide vane body (31) of the submersible tubular pump is connected with a second flow channel (56) at the upstream end of the drainage pipeline, and the first flow channel (53) and the second flow channel (56) are in a horn mouth shape gradually expanding outwards in the direction far away from the submersible tubular pump;

the submersible tubular pump comprises a water inlet chamber (11), an impeller part (2) and a guide vane body (31) which are coaxially and sequentially arranged in a shell (4) along a fluid conveying direction, wherein the water inlet chamber (11) and the guide vane body (31) are fixed on the shell (4), a driving part for driving the impeller part (2) to rotate is arranged in the shell (4), a first radial bearing is arranged between the water inlet chamber (11) and the impeller part (2) to bear the radial load of one side of the impeller part (2), and a second radial bearing is arranged between the guide vane body (31) and the impeller part (2) to bear the radial load of the other side of the impeller part (2); a first axial bearing is arranged between the water inlet chamber (11) and the impeller part (2) to bear the axial load of one side of the impeller part (2), and a second axial bearing is arranged between the guide vane body (31) and the impeller part (2) to bear the axial load of the other side of the impeller part (2).

2. The submersible through-flow pump drainage system with high thrust water lubrication bearing structure according to claim 1, wherein the drainage pipeline (5) comprises an upstream end pipeline and a downstream end pipeline which are coaxially arranged, and the upstream end pipeline and the downstream end pipeline are connected with each other through a pump pit base for fixing the submersible through-flow pump; the adjacent ends of the upstream end pipeline and the downstream end pipeline are both provided with embedded pipes (54), and the two embedded pipes (54) are connected with the two ends of the submersible tubular pump through expansion joints (55).

3. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to claim 2, wherein a flood gate (58) is arranged in the drainage pipeline (5) and is positioned at the upstream end of the submersible tubular pump, and a quick reaction gate (57) for cutting off the flow when the pump is stopped is arranged between the flood gate (58) and the submersible tubular pump; and an inspection gate (52) positioned at the downstream end of the submersible tubular pump is also arranged in the drainage pipeline (5).

4. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to any one of claims 1 to 3, wherein the first radial bearing, the second radial bearing, the first axial bearing and the second axial bearing are all water-lubricated bearings; a water suction end shaft (211) extending into the water inlet chamber (11) is arranged at the adjacent end of the water inlet chamber (11) of the impeller hub (21) of the impeller part (2), the water suction end shaft (211) and a first sliding sleeve (13) in the water inlet chamber (11) are matched with each other to form a first radial bearing, and a first sliding ring (12) arranged on the water inlet chamber (11) and a second sliding ring (27) arranged on the impeller hub (21) are matched with each other to form a first axial bearing; the water inlet chamber (11) penetrates through the water inlet shaft (211) along the axial direction to introduce external fluid, a first cooling flow channel (22) is formed in the water suction end shaft (211), a conveying part for conveying the fluid is arranged in the first cooling flow channel (22), the inlet end of the first cooling flow channel (22) is communicated with the inner cavity of the water inlet chamber (11), the outlet end of the first cooling flow channel (22) is communicated with a gap between the water inlet chamber (11) and the impeller part (2), the fluid in the water inlet chamber (11) flows back to the water inlet chamber (11) along the gap between the water outlet end shaft (213) and the guide vane body (31) through the rear part of the first cooling flow channel (22), and the other part flows to the low-pressure end (b) of the vane (23) through the gap between the first sliding ring (12) and the second sliding ring (27).

5. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to claim 4, wherein the first cooling flow channel (22) comprises a main flow channel which is arranged along the axial direction of the water suction end shaft (211) and branch flow channels which are formed by radially dividing the downstream end of the main flow channel, the total flow area of each branch flow channel is equal to the flow area of the main flow channel, and the outlet of each branch flow channel is the outlet of the first cooling flow channel (22); the conveying part is a small shaftless pump wheel (212) which is fixed in the main flow passage and conveys fluid along the axial direction.

6. The submersible through-flow pump drainage system with high thrust water lubricated bearing structure according to claim 4, characterized in that a third slide ring (28) provided on the impeller hub (21) and a fourth slide ring (33) on the vane body (31) cooperate with each other to form a second axial bearing; a second cooling flow channel (29) is formed in the impeller hub (21), the inlet end of the second cooling flow channel (29) is communicated with a gap between the guide vane body (31) and the impeller portion (2), the outlet end of the second cooling flow channel (29) is communicated with a gap between the water inlet chamber (11) and the impeller portion (2), and part of fluid on the high-pressure end (a) side of the blade (23) sequentially passes through the gap between the third sliding ring (28) and the fourth sliding ring (33), the second cooling flow channel (29) and the gap between the first sliding ring (12) and the second sliding ring (27) and then flows back to the low-pressure end (b) of the blade (23).

7. The submersible tubular pump drainage system with high thrust water lubrication bearing structure according to claim 4, wherein the adjacent end of the guide vane body (31) of the impeller hub (21) is provided with a water outlet end shaft (213) extending into the guide vane body (31), and the water outlet end shaft (213) and a second sliding sleeve (32) in the guide vane body (31) are matched with each other to form a second radial bearing.

8. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to any one of claims 1 to 3, wherein the impeller part (2) comprises an impeller hub (21) and blades (23) fixed on the impeller hub (21), an annular mounting groove corresponding to the impeller part (2) is formed in the inner wall of the shell (4) along the circumferential direction, an annular impeller shell (24) arranged around the impeller part (2) is fixed on the outer edge of each blade (23), the impeller shell (24) and the mounting groove are enclosed to form a mounting cavity (41) for a driving part to be installed in, and the driving part drives the impeller shell (24) to rotate; a clearance exists between the impeller shell (24) and the shell (4), and a labyrinth seal is arranged at the clearance to prevent solid matters in the fluid from entering the installation cavity (41).

9. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to claim 8, wherein the driving part comprises a stator (26) and a rotor (25) which are arranged in the mounting cavity (41), the stator (26) is fixedly connected with the shell (4) and drives the rotor (25) to rotate through electromagnetic induction, and the rotor (25) is fixedly connected with the impeller shell (24).

10. The submersible tubular pump drainage system with the high-thrust water-lubricated bearing structure according to any one of claims 1 to 3, wherein the stator (26) is formed by laminating stator laminations, the stator laminations comprise fan-shaped high-permeability silicon steel sheets, and the high-permeability silicon steel sheets are connected and positioned through special-shaped grooves to form annular stator laminations; the rotor (25) is formed by laminating rotor punching sheets, each rotor punching sheet comprises a fan-shaped high-permeability silicon steel sheet, and each high-permeability silicon steel sheet is connected and positioned through a special-shaped groove to form an annular rotor punching sheet; the guide vane body (31) penetrates along the axial direction to introduce external fluid; the impeller hub (21) of the impeller part (2) is hollow.

Technical Field

The invention relates to the field of water conservancy transportation, in particular to a submersible tubular pump drainage system with a high-thrust water lubrication bearing structure.

Background

The drainage system is a whole formed by combining facilities for collecting and conveying drainage, treating and discharging water quality and the like in a certain mode. The pumping and drainage pump station is one of the components of the drainage system, and the pumping and drainage pump station is usually used for pumping and draining fluid by using a cross-flow pump; the through-flow pump is one kind of horizontal axial-flow pump, and is one kind of low-lift axial-flow pump, which is assembled inside the underwater dam in the machine pit with motor, speed reducer and water pump set in one integral, and has water inlet and outlet flow channels in one straight line and similar to straight cylinder shape.

The diameter of a blade of an existing tubular pump can only reach 2.3m to the maximum due to structural reasons, the maximum thrust which can be borne by an internal rolling bearing can only reach 20 tons generally, and on the premise of meeting the sealing performance, the existing tubular pump cannot meet the requirement of larger thrust and cannot meet the requirement of large-flow fluid delivery of a drainage system, so that the problem of urgent need is solved.

Disclosure of Invention

In order to avoid and overcome the technical problems in the prior art, the invention provides a submersible tubular pump drainage system with a high-thrust water-lubricated bearing structure. The tubular pump in the drainage system does not need any sealing and locking structure, the diameter of the designed blade can reach 5.7m, and meanwhile, the structure can bear 100 tons of thrust, thereby meeting the requirement of large-flow fluid delivery of the drainage system.

In order to achieve the purpose, the invention provides the following technical scheme:

a submersible tubular pump drainage system with a high-thrust water-lubricated bearing structure comprises a drainage pipeline and a submersible tubular pump arranged in the drainage pipeline, wherein a water inlet chamber of the submersible tubular pump is connected with a first flow channel at the downstream end of the drainage pipeline, a guide vane body of the submersible tubular pump is connected with a second flow channel at the upstream end of the drainage pipeline, and the first flow channel and the second flow channel are in a horn mouth shape gradually expanding outwards along the direction away from the submersible tubular pump;

the submersible tubular pump comprises a water inlet chamber, an impeller part and a guide vane body which are coaxially and sequentially arranged in a shell along a fluid conveying direction, wherein the water inlet chamber and the guide vane body are fixed on the shell; a first axial bearing is arranged between the water inlet chamber and the impeller part to bear the axial load of one side of the impeller part, and a second axial bearing is arranged between the guide vane body and the impeller part to bear the axial load of the other side of the impeller part.

As a further scheme of the invention: the drainage pipeline comprises an upstream end pipeline and a downstream end pipeline which are coaxially arranged, and the upstream end pipeline and the downstream end pipeline are connected with each other through a pump pit base for fixing the submersible tubular pump; the adjacent ends of the upstream end pipeline and the downstream end pipeline are provided with embedded pipes, and the two embedded pipes are connected with the two ends of the submersible tubular pump through telescopic joints.

As a still further scheme of the invention: a flood gate positioned at the upstream end of the submersible tubular pump is arranged in the drainage pipeline, and a quick reaction gate for cutting off when the pump is stopped is arranged between the flood gate and the submersible tubular pump; and an overhaul gate positioned at the downstream end of the submersible tubular pump is also arranged in the drainage pipeline.

As a still further scheme of the invention: the first radial bearing, the second radial bearing, the first axial bearing and the second axial bearing are all water lubrication bearings; the adjacent end of the water inlet chamber of the impeller hub of the impeller part is provided with a water suction end shaft extending into the water inlet chamber, the water suction end shaft and a first sliding sleeve in the water inlet chamber are matched with each other to form a first radial bearing, and a first sliding ring arranged on the water inlet chamber and a second sliding ring on the impeller hub are matched with each other to form a first axial bearing; the water inlet chamber is communicated along the axial direction to introduce external fluid, a first cooling flow channel is formed in the water suction end shaft, a conveying part used for conveying the fluid is arranged in the first cooling flow channel, the inlet end of the first cooling flow channel is communicated with the inner cavity of the water inlet chamber, the outlet end of the first cooling flow channel is communicated with a gap between the water inlet chamber and the impeller part, the fluid in the water inlet chamber flows back to the water inlet chamber along the gap between the water outlet end shaft and the guide vane body through the rear part of the first cooling flow channel, and the other part flows to the low-pressure end of the vane through the gap between the first sliding ring and the second sliding ring.

As a still further scheme of the invention: the first cooling flow channel comprises a main flow channel arranged along the axial direction of the water absorption end shaft and branch flow channels formed by radially dividing the downstream end of the main flow channel, the total flow area of each branch flow channel is equal to that of the main flow channel, and the outlet of each branch flow channel is the outlet of the first cooling flow channel; the conveying part is a small shaftless pump wheel which is fixed in the main flow passage and conveys fluid along the axial direction.

As a still further scheme of the invention: the third sliding ring arranged on the impeller hub and the fourth sliding ring on the guide vane body are matched with each other to form a second axial bearing; and a second cooling flow channel is formed in the impeller hub, the inlet end of the second cooling flow channel is communicated with a gap between the guide vane body and the impeller part, the outlet end of the second cooling flow channel is communicated with a gap between the water inlet chamber and the impeller part, and part of fluid on the high-pressure end side of the blade flows through the gap between the third sliding ring and the fourth sliding ring, the second cooling flow channel and the gap between the first sliding ring and the second sliding ring in sequence and then flows back to the low-pressure end of the blade.

As a still further scheme of the invention: the adjacent end of the guide vane body of the impeller hub is provided with a water outlet end shaft extending into the guide vane body, and the water outlet end shaft and a second sliding sleeve in the guide vane body are matched with each other to form a second radial bearing.

As a still further scheme of the invention: the impeller part comprises an impeller hub and blades fixed on the impeller hub, an annular mounting groove corresponding to the impeller part is formed in the inner wall of the shell along the circumferential direction, an annular impeller shell arranged around the impeller part is fixed on the outer edge of each blade, the impeller shell and the mounting groove are enclosed to form a mounting cavity for a driving part to be mounted in, and the driving part drives the impeller shell to rotate; a gap exists between the impeller shell and the shell, and a labyrinth seal is arranged at the gap to prevent solid matters in fluid from entering the installation cavity.

As a still further scheme of the invention: the driving part comprises a stator and a rotor which are arranged in the installation cavity, the stator is fixedly connected with the shell and drives the rotor to rotate through electromagnetic induction, and the rotor is fixedly connected with the impeller shell.

As a still further scheme of the invention: the stator is formed by laminating stator punching sheets, each stator punching sheet comprises a fan-shaped high-permeability silicon steel sheet, and each high-permeability silicon steel sheet is connected and positioned through a special-shaped groove to form an annular stator punching sheet; the rotor is formed by laminating rotor punching sheets, each rotor punching sheet comprises a fan-shaped high-permeability silicon steel sheet, and each high-permeability silicon steel sheet is connected and positioned through a special-shaped groove to form an annular rotor punching sheet; the guide vane body penetrates along the axial direction to introduce external fluid; the impeller hub of the impeller part is hollow.

Compared with the prior art, the invention has the beneficial effects that:

1. the water inlet chamber, the impeller part and the guide vane body are separately cast, and the water inlet chamber, the impeller part and the guide vane body are sequentially installed in the shell along the flow direction of the fluid, after the water inlet chamber and the guide vane body are respectively welded on the shell, two points of support can be carried out on the impeller part by arranging the radial bearings between the water inlet chamber and the impeller part and between the guide vane body and the impeller part so as to bear the radial load of the impeller part; the axial bearings are arranged between the water inlet chamber and the impeller part and between the guide vane body and the impeller part, so that the impeller part can be clamped and positioned, and forward and reverse thrust generated by the impeller part in a working state can be borne; after the water lubrication bearing is selected as the radial bearing and the axial bearing, the pump body assembly of the large-size tubular pump with the blade diameter of 5.7m can be completed without any sealing and locking mechanism, and the split casting of the water inlet chamber, the impeller part and the guide blade body facilitates the processing, the assembly and the disassembly, facilitates the step-by-step installation of the tubular pump, simultaneously improves the strength and the rigidity of the main shaft, and further improves the safety and the reliability of the unit; because the whole device is not limited by the sealing performance, the large-scale integral structure can bear the thrust of 100 tons; after the cast submersible tubular pump is installed in a drainage pipeline, the requirement of large-flow fluid delivery of a drainage system is met; the bell mouth-shaped design of the flow channels on the two sides of the submersible tubular pump plays a role in rectifying and accelerating the fluid entering the water inlet chamber, and the fluid is uniformly diffused and discharged after leaving the guide vane body.

2. The breaking-type design of the drainage pipeline enables two sections of pipelines at the upper and lower ends to be connected with two ends of the submersible tubular pump through expansion joints, and the device can be suitable for the installation and the disassembly of submersible tubular pumps with different sizes; the drainage system can be blocked by closing the flood gate; the rapid reaction gate can cut off flow rapidly when the submersible tubular pump stops, so that the damage of a unit caused by the phenomena of backwater impact on the impeller, impeller reversal and the like can be prevented; and the submerged tubular pump can be overhauled by closing the overhaul gate and the flood control gate.

3. According to the invention, the water absorption end shaft is matched with the first sliding sleeve to form a first radial bearing to bear the radial load of one side of the impeller hub, and then the first sliding ring is matched with the second sliding ring to form a first axial bearing to bear the axial load of one side of the impeller hub; a first cooling flow channel is formed in the water suction end shaft, a shaftless small pump wheel or other conveying structures are arranged in the first cooling flow channel, fluid in the water inlet chamber can be conveyed to a gap between the impeller hub and the water inlet chamber along the first cooling flow channel, one part of the fluid flows back to an inner cavity of the water inlet chamber through the gap between the water suction end shaft and the first sliding sleeve, the other part of the fluid flows to the low-pressure end of the blade through the gap between the first sliding ring and the second sliding ring, and forced water lubrication of the first radial bearing and the first axial bearing is realized through conveying of the shaftless small pump wheel to the fluid, self-lubricating cooling is realized, and other cooling power sources are not needed; the first cooling flow channel is formed by combining a main flow channel which is axially arranged and a sub-flow channel which is radially divided, and can evenly convey fluid to a gap between the water inlet chamber and the impeller hub, so that the cooling is more uniform.

4. According to the invention, through the matching of the third slip ring and the fourth slip ring, a second axial bearing is formed to bear the axial load on the other side of the impeller hub; the second cooling flow channel is formed in the impeller hub, so that a gap between the water inlet chamber and the impeller hub and a gap between the guide vane body and the impeller hub are communicated; under the influence of pressure difference, part of fluid at the high-pressure end of the blade enters a second cooling flow channel along a gap between a third sliding ring and a fourth sliding ring and then flows back to the low-pressure end of the blade through the gap between the first sliding ring and the second sliding ring, so that forced lubrication water lubrication of the first axial bearing and the second axial bearing is realized; when the impeller passes through the second cooling flow channel in the circulating process, continuous pressurized circulating cooling can be performed on the impeller hub; impeller wheel hub designs for hollow structure, has effectively improved impeller wheel hub's radiating efficiency.

5. The water outlet end shaft and the second sliding sleeve in the guide vane body are matched with each other to form a second radial bearing so as to bear the radial load on the other side of the impeller hub; because the guide vane body is also of an axial through structure and is influenced by pressure, fluid enters the guide vane body along one end, far away from the impeller hub, of the guide vane body and can forcedly lubricate the second radial bearing through a gap between the water outlet end shaft and the second sliding sleeve.

6. According to the invention, through the matching of the impeller shell and the mounting groove in the shell, a mounting cavity is formed by enclosing, and the driving part is arranged in the shell, so that the axial length of the pump body is shortened, and the structure of the pump body is more compact; the rotor and the impeller shell can be driven to synchronously rotate through electromagnetic induction to drive the integrated impeller part to rotate by fixing the rotor and the impeller shell and fixing the stator and the shell, wherein the rotor and the stator adopt a wet rotor and a wet stator; when fixed impurities exist in the fluid, labyrinth seals can be arranged between the shell and the impeller shell to prevent fixed objects from entering the installation cavity, so that the insulation of the motor is prevented from being damaged, and the operation safety of the unit is ensured.

7. The diameter of the impeller is larger, so that the diameters of the stator punching sheet and the rotor punching sheet are also larger, the limitation that the specification size of the silicon steel sheet is smaller than 1200mm is broken through, and the whole sheet cannot be punched; the fan-shaped high-permeability silicon steel sheets are selected and connected and positioned through the special-shaped grooves, so that the annular stator punching sheet and the rotor punching sheet can be combined to form the annular stator punching sheet and the annular rotor punching sheet, and the use requirement of the large-size punching sheet is met.

8. The radial bearing and the axial bearing are formed by matching the shaft and the sliding sleeve as well as the sliding ring and the sliding ring, and after the radial bearing and the axial bearing are worn after long-term use, the shaft, the sliding sleeve and the sliding ring are convenient to disassemble and replace due to the fact that the radial bearing and the axial bearing are assembled and combined among structures, and the safety and the reliability of the pump body during operation are improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a submersible through-flow pump according to the present invention.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

1. A water absorption end; 11. a water inlet chamber; 12. a first slip ring; 13. a first sliding sleeve;

2. an impeller portion; 21. an impeller hub;

211. a water-absorbing end shaft; 212. a shaftless small pump impeller; 213. a water outlet end shaft;

22. a first cooling flow passage; 23. a blade; 24. an impeller housing; 25. a rotor; 26. a stator;

27. a second slip ring; 28. a third slip ring; 29. a second cooling flow channel;

3. a water outlet end; 31. a guide blade body; 32. a second sliding sleeve; 33. a fourth slip ring;

4. a housing; 41. a mounting cavity;

5. a drain line; 51. a safety grill; 52. repairing the gate;

53. a first flow passage; 54. pre-burying a pipe; 55. an expansion joint;

56. a second flow passage; 57. a fast working gate; 58. a flood gate;

a. a high-voltage end; b. a low-voltage end.

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.

Referring to fig. 1 to 3, in an embodiment of the present invention, a submersible tubular pump drainage system with a high thrust water lubrication bearing structure includes a drainage pipeline 5 and a submersible tubular pump disposed in the drainage pipeline 5.

The submersible tubular pump comprises a cylindrical shell 4 which is through along the axial direction, one side of the shell 4 is a water suction end 1, the other side of the shell is a water outlet end 3, a water inlet chamber 11 is arranged at the water suction end 1, and a guide vane body 31 is arranged at the water outlet end 3. The inlet chamber 11 and the guide vane body 31 are fixed to the wall of the housing 4 by guide vanes, preferably by welding. The housing 4 may be an integral structure or a split structure.

An impeller part 2 is arranged between the water inlet chamber 11 and the guide vane body 31, the impeller part 2 comprises an impeller hub 21, blades 23 are arranged on the impeller hub 21, and the number of the blades is preferably three. An annular mounting groove is formed in the inner wall of the housing 4 along the circumferential direction, and corresponds to the position of the blade 23. The outer ring of each blade 23 is provided with an annular impeller shell 24 surrounding each blade 23, the impeller shell 24 is welded and fixed with the tip of each blade 23, and the impeller shell 24 and the mounting groove enclose to form a mounting cavity 41; the labyrinth seal is the only sealing structure of the invention and is arranged between the impeller shell and the shell only when the water quality is poor.

The stator 26 and the rotor 25 as the driving source are both fixed in the mounting cavity 41, the stator 26 and the rotor 25 are wet stators and wet rotors, the rotor 25 is fixedly connected with the impeller shell 24, the stator 26 is fixedly connected with the shell 4 and drives the rotor 25 to rotate through electromagnetic induction, and the rotor 25 drives the impeller part 2 to rotate while rotating. The stator 26 is preferably formed by laminating stator laminations, and the rotor 25 is also preferably formed by laminating rotor laminations. The stator punching sheet and the rotor punching sheet are formed by combining a plurality of high-permeability silicon steel sheets, each high-permeability silicon steel sheet is fan-shaped, and adjacent high-permeability silicon steel sheets are connected and positioned through special-shaped grooves to form annular stator punching sheets and annular rotor punching sheets. The winding coils of the stator 26 are water-resistant winding coils.

The side of the blade 23 adjacent to the water suction end 1 is a low-pressure end b, and the side of the blade 23 adjacent to the water outlet end 3 is a high-pressure end a.

The impeller hub 21 preferably penetrates axially to form a hollow state so as to facilitate heat dissipation, the openings at the two ends are respectively provided with a water suction end shaft 211 and a water outlet end shaft 213 which are matched with the openings in shape, and the water suction end shaft 211 and the water outlet end shaft 213 are preferably positioned at the openings of the hub 21 through a finish machining spigot.

The impeller portion 2 and the guide vane body 31 of the water inlet chamber 11 are coaxial and arranged in this order in the flow direction of the fluid. The inlet chamber 11 and the guide vane body 31 are axially penetrated to introduce an external fluid. The end shaft 211 that absorbs water extends to in the intake chamber 11, and the cover is equipped with the axle sleeve on the end shaft 211 axle body that absorbs water, cooperates each other through the first sliding sleeve 13 in axle sleeve and the intake chamber 11, forms first radial bearing in order to bear the radial load of impeller wheel hub 21 one side. The water outlet shaft 213 extends into the guide vane body 31, and the shaft body of the water outlet shaft 213 is sleeved with a shaft sleeve, and the shaft sleeve is matched with the second sliding sleeve 32 in the guide vane body 31 to form a second radial bearing to bear the radial load on the other side of the impeller hub 21.

One end of the water inlet chamber 11 adjacent to the impeller hub 21 is provided with a first slip ring 12, the impeller hub 21 is provided with a second slip ring 27 corresponding to the position of the first slip ring 12, and the first slip ring 12 and the second slip ring 27 are matched with each other to form a first axial bearing so as to bear the axial load on one side of the impeller hub 21. One end of the guide vane body 31 adjacent to the impeller hub 21 is provided with a fourth sliding ring 33, the impeller hub 21 is provided with a third sliding ring 28 corresponding to the position of the fourth sliding ring 33, and the third sliding ring 28 and the fourth sliding ring 33 are matched with each other to form a second axial bearing to bear the axial load on the other side of the impeller hub 21. The first radial bearing, the second radial bearing, the first axial bearing and the second axial bearing can be replaced by other structures, and only the radial load and the axial load of the impeller hub 21 can be borne, and the first radial bearing, the second radial bearing, the first axial bearing and the second axial bearing are of a water lubricating structure.

Wherein, the first cooling flow channel 22 is arranged in the water absorption end shaft 211, the first cooling flow channel 22 comprises a main flow channel which is arranged along the axial direction of the water absorption end shaft 211, the inlet end of the main flow channel is communicated with the inner cavity of the water inlet chamber 11, the downstream end of the main flow channel is divided along the radial direction to form a sub-flow channel, and the outlet of the sub-flow channel is communicated with the gap between the water inlet chamber 11 and the impeller hub 21. A small shaftless impeller 212 for axially conveying fluid is arranged in the main flow passage. The total flow area of each flow dividing flow passage is equal to the flow area of the main flow passage. The inlet end of the main flow channel is the channel inlet of the first cooling channel 22, and the channel outlet of each branch flow channel is the channel outlet of the first cooling channel 22.

When the cross-flow pump works, the shaftless small pump impeller 212 conveys the fluid in the water inlet chamber 11 to each branch runner along the main runner. The fluid enters the gap between the impeller hub 21 and the water inlet chamber 11 after leaving the branch runner, one part of the fluid flows back to the inner cavity of the water inlet chamber 11 through the gap between the water suction end shaft 211 and the first sliding sleeve 13, and the other part of the fluid flows to the low-pressure end b of the blade 23 through the gap between the first sliding ring 12 and the second sliding ring 27, so as to perform forced water lubrication on the first radial bearing and the first axial bearing respectively.

The impeller hub 21 is further provided with a second cooling flow passage 29 therein, and the second cooling flow passage 29 is preferably a flow passage that penetrates the impeller hub 21 in the axial direction of the impeller hub 21. The water inlet end of the second cooling flow passage 29 is communicated with the gap between the guide vane body 31 and the impeller hub 21, and the water outlet end of the second cooling flow passage 29 is communicated with the gap between the water inlet chamber 11 and the impeller hub 21. Under the influence of the pressure, the fluid on the high-pressure end a side of the blade 23 enters the second cooling flow channel 29 along the gap between the third slip ring 28 and the fourth slip ring 33, passes through the second cooling flow channel 29, then flows back to the low-pressure end b side of the blade 23 through the gap between the first slip ring 12 and the second slip ring 27, and forcibly lubricates the second axial bearing, the impeller hub 21 and the first axial bearing with water. Because impeller wheel hub 21 is the hollow state inside, the cooling effect is better.

Because the guide vane body 31 is also in an axial through structure, under the influence of pressure, fluid enters the guide vane body 31 from one end of the guide vane body 31 far away from the impeller hub 21, and passes through a gap between the water outlet end shaft 213 and the second sliding sleeve 32 to continuously force water lubrication in the second radial axial direction.

The drainage pipeline 5 comprises an upstream end pipeline and a downstream end pipeline which are coaxially arranged, and the upstream end pipeline and the downstream end pipeline are connected with each other through a pump pit base for fixing the submersible tubular pump; the adjacent ends of the upstream end pipeline and the downstream end pipeline are both provided with embedded pipes 54, and the two embedded pipes 54 are connected with the two ends of the submerged tubular pump through telescopic joints 55. After the submersible cross-flow pump is installed, fluid downstream of the drain line 5 is delivered upstream.

The second flow channel 56 of the upstream end pipeline is connected with the guide vane body 31, the first flow channel 53 of the downstream end pipeline is connected with the water inlet chamber 11, the first flow channel 53 and the second flow channel 56 are in a horn mouth shape gradually expanding outwards along the direction far away from the submersible tubular pump, one end of the adjacent submersible tubular pump is a circular cross section so as to be matched with the shape of the telescopic joint 55, and the circular cross section gradually expands outwards along the direction far away from the submersible tubular pump to form a rectangular cross section.

A flood gate 58 is arranged in the pipeline at the upstream end, and a quick response gate 57 for cutting off the flow when the pump is stopped is arranged between the flood gate 58 and the submerged tubular pump.

An inspection gate 52 is arranged in the pipeline at the downstream end, and a safety grid 51 for intercepting sundries is arranged at the downstream end of the inspection gate 52.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.