CN112576519A

CN112576519A - Canned motor pump and water supply system

Info

Publication number: CN112576519A
Application number: CN202011563710.7A
Authority: CN
Inventors: 颜成刚; 林荣; 张逸
Original assignee: Leo Group Co ltd
Current assignee: Leo Group Co ltd; Leo Group Zhejiang Pump Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-03-30
Also published as: CN114278576A; WO2023060848A1; CN114278576B; CN114233639B; CN114233640A; CN114233640B; WO2023060843A1; CN114233639A; WO2023060842A1

Abstract

The invention relates to the technical field of water pumps, in particular to a canned motor pump and a water supply system. The shielding pump comprises a water pump outer cylinder, a stator assembly, a rotor assembly and a diversion shell; the stator assembly in the shape of an annular cylinder is hermetically arranged in the outer cylinder of the water pump, and the rotor assembly is rotatably arranged in the middle of the stator assembly through a bearing; a first space is formed by enclosing the outer cylinder of the water pump and the outer wall of the stator assembly; a second space is formed by enclosing the outer wall of the rotor assembly and the inner wall of the stator assembly; a first flow channel is formed from the inlet of the shield pump, the water inlet section of the diversion shell, the water outlet section of the diversion shell, the first space and the outlet of the shield pump; and a second flow passage is formed from the inlet of the shield pump, the water inlet section of the guide shell, the bearing to the second space and to the outlet of the shield pump. The shielding pump can be cooled by using pumped fluid, and the cooling effect is excellent.

Description

Canned motor pump and water supply system

Technical Field

The invention relates to the technical field of water pumps, in particular to a canned motor pump and a water supply system.

Background

Water pumps are used to direct low or remote water to a designated location or for pressurized water streams, which have an important position in water supply systems. The pump body of the canned motor pump is connected with the motor, and the rotor of the motor and the impeller of the pump body are fixed on the same rotating shaft.

However, the cooling liquid of the existing canned motor pump is separately arranged from the fluid to be pumped, and the cooling effect is not good.

Disclosure of Invention

Objects of the present invention include, for example, providing a canned motor pump and water supply system that is capable of cooling a canned motor pump with a pumped fluid and that has a superior cooling effect.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides a canned motor pump comprising:

the water pump comprises a water pump outer cylinder, a stator assembly, a rotor assembly and a diversion shell;

the stator assembly in the shape of an annular cylinder is hermetically arranged in the outer cylinder of the water pump, and the rotor assembly is rotatably arranged in the middle of the stator assembly through a bearing;

a first space is formed between the outer cylinder of the water pump and the outer wall of the stator assembly in a surrounding manner; a second space is formed by enclosing the outer wall of the rotor assembly and the inner wall of the stator assembly;

a first flow channel is formed from the inlet of the shielding pump, the water inlet section of the diversion shell, the water outlet section of the diversion shell, the first space and the outlet of the shielding pump;

and a second flow passage is formed from the inlet of the shield pump, the water inlet section of the guide shell, the bearing to the second space and to the outlet of the shield pump.

The shield pump of the scheme is provided with a first flow passage and a second flow passage which are mutually independent. Wherein the first flow passage is capable of introducing fluid from an inlet of the canned motor pump into the first space and delivering the fluid to an outlet of the canned motor pump; therefore, the first flow channel can pump the fluid from the inlet to the outlet and can cool the stator assembly in the first space by utilizing the fluid. The second flow passage is capable of introducing fluid from the inlet of the canned motor pump to the second space via the bearing and delivering the fluid to the outlet of the canned motor pump; the second flow passage can pump the fluid from the inlet to the outlet, and can cool the bearing and the rotor assembly in the second space by using the fluid. To sum up, the setting of first runner and second runner can satisfy the transport to the fluid promptly, can ensure the cooling of stator module, rotor subassembly and bearing again, and it has improved prior art and has set up the coolant liquid alone and carry out refrigerated mode, can also ensure fluidic normal pump sending, consequently has simple structure, convenient to use, characteristics that economic benefits is good.

In an alternative embodiment, a diversion trench is arranged on the bearing;

the guide groove penetrates along the axial direction of the bearing.

In an alternative embodiment, the bearing is a graphite bearing;

the graphite bearing is rotatably connected with the rotor assembly.

In an alternative embodiment, the rotor assembly comprises a shaft and a rotor;

the rotor is fixedly arranged on the rotating shaft; and two ends of the rotating shaft are respectively and rotatably connected with the bearing so as to drive the rotor to rotate.

In an alternative embodiment, the rotor assembly further comprises a spindle sleeve;

the rotor is fixedly arranged on the rotating shaft through the rotating shaft sleeve.

In an alternative embodiment, the stator assembly comprises a stator outer cylinder, a stator inner cylinder, a stator winding and a closed end piece;

the stator inner barrel and the stator outer barrel are concentrically arranged to enclose to form an accommodating space for accommodating the stator winding;

the closed end piece is respectively connected with the stator outer cylinder and the stator inner cylinder so as to close the accommodating space.

In an alternative embodiment, the canned motor pump further comprises an insulating paper;

the insulating paper is arranged on the inner wall of the stator inner cylinder;

and along the axial direction of the stator inner cylinder, the insulating paper is positioned at two ends of the stator inner cylinder, which are far away from the stator winding.

In an alternative embodiment, the canned motor pump further comprises a front end cap, a front housing, a rear end cap, and a rear housing;

along the axial direction of the water pump outer cylinder, the front end cover and the front shell are respectively fixed on the inner wall and the outer wall of one end of the pump outer cylinder, and the rear end cover and the rear shell are respectively fixed on the inner wall and the outer wall of the other end of the pump outer cylinder;

the front end cover and the guide shell enclose to form a third space for accommodating the impeller.

In an alternative embodiment, the canned motor pump further comprises an upper fixing seat and a connecting rod;

along the axial direction of the outer water pump barrel, one end of the upper fixing seat abuts against the front end cover through the diversion shell, and the other end of the upper fixing seat is connected with the rear end cover through a connecting rod;

one end of the rotor assembly is rotatably arranged on the upper fixing seat through the bearing, and the other end of the rotor assembly is arranged on the rear end cover through the bearing.

In a second aspect, the present invention provides a water supply system comprising:

a water supply pipe, a water outlet end and the canned motor pump of any one of the preceding embodiments;

the inlet of the shielding pump is connected with the water supply pipe, and the outlet of the shielding pump is connected with the water outlet end.

The beneficial effects of the embodiment of the invention include, for example:

the shield pump of this scheme includes water pump urceolus, stator module, rotor subassembly and blower inlet casing. The rotor assembly is rotatably disposed within the cylindrical space of the annular stator assembly. When the stator component is electrified, a rotating magnetic field is generated and acts on the rotor component, so that the rotor component rotates and drives the impeller to rotate, and pumping power is provided for the canned motor pump. Further, the canned motor pump has a first flow passage and a second flow passage that are independent of each other. The first flow passage and the second flow passage can pump the fluid at the inlet of the canned motor pump to the outlet of the canned motor pump, so that two passages are provided for the canned motor pump to facilitate the pumping of the fluid, and the fluid conveying efficiency is improved. Meanwhile, the fluid flowing through the first flow channel can cool the stator assembly in the first space, so that the stable work of the stator assembly is guaranteed; and the fluid flowing through the second flow channel can cool the rotor assembly and the bearing in the second space, so that the bearing and the rotor assembly can work stably and efficiently. To sum up, the first runner and the second runner are arranged to meet the requirement of conveying the fluid, the stator assembly, the rotor assembly and the bearing can be cooled by the pumped fluid, and the cooling effect is outstanding. The cooling device has the advantages of improving the technical problems of the prior art that the cooling liquid needs to be independently arranged for cooling, and the cooling effect is poor, along with simple structure, convenient use and good economic benefit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a canned motor pump according to an embodiment of the present invention;

FIG. 2 is a partial schematic view of a stator assembly of a canned motor pump according to an embodiment of the invention;

FIG. 3 is another partial schematic view of a stator assembly of a canned motor pump according to an embodiment of the invention;

FIG. 4 is a cross-sectional view of a front end cap of a canned motor pump of an embodiment of the invention;

FIG. 5 is a cross-sectional view of a rear end cap of a canned motor pump according to an embodiment of the invention;

FIG. 6 is a schematic view of a bearing of a canned motor pump according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a control device of a canned motor pump according to an embodiment of the present invention.

Icon: 10-a canned pump; 11-a first space; 12-a second space; 13-a third space; 14-an inlet; 15-an outlet; 100-water pump outer cylinder; 200-a stator assembly; 201-an accommodation space; 210-a stator tub; 220-stator inner cylinder; 230-stator windings; 240-a hermetic end piece; 241-a first end piece; 242 — a second end piece; 243-first step; 244 — a second step; 245-a third step; 250-insulating paper; 300-a rotor assembly; 310-a rotating shaft; 320-a rotor; 330-a rotating shaft sleeve; 400-a guide shell; 500-an impeller; 510-a water inlet; 600-a bearing; 610-a diversion trench; 710-a front end cap; 711-front disk; 712-a front end body; 713-extension port; 720-front shell; 730-a fixed cover; 740-rear end cap; 741-a rear disc; 742-a backend body; 750-a rear housing; 760-a fixed seat; 800-a control device; 810-a control box; 820-a bottom case; 830-an aluminum piece; 840-pressing plate; 850-a controller; 860-power line.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The common centrifugal pump is driven by connecting an impeller shaft of the pump with an electric shaft through a coupling, so that the impeller and the electric motor rotate together to work. The canned motor pump is a sealless pump, the pump and the drive motor are sealed in a pressure vessel filled with pumped medium, the pressure vessel has only static seal, and a set of electric wires provides a rotating magnetic field and drives the rotor. The structure eliminates a rotating shaft sealing device of the traditional centrifugal pump, so that the leakage can be completely avoided.

The canned motor pump connects the pump and the motor together, the rotor of the motor and the impeller of the pump are fixed on the same shaft, the rotor of the motor and the stator are separated by the canned sleeve, the rotor runs in the conveyed medium, and the power is transmitted to the rotor through the magnetic field of the stator.

However, the fluid pumping pipeline and the cooling pipeline of the existing canned motor pump are separately arranged. Further, the shield pump is typically pumping a fluid that is completely different from the cooling medium in the cooling circuit. So make and need set up cooling pipeline and coolant alone, caused the pipeline complicated, made the difficulty, control inconvenient, and the not good problem of cooling effect.

To improve the above technical problem, the following embodiments provide a canned motor pump and a water supply system.

Referring to fig. 1, the present embodiment provides a canned motor pump 10, which includes a water pump outer cylinder 100, a stator assembly 200, a rotor assembly 300, and a guide shell 400.

A stator assembly 200 having a ring cylinder shape is hermetically provided in the water pump outer cylinder 100, and a rotor assembly 300 is rotatably provided in the middle of the stator assembly 200 through a bearing 600;

a first space 11 is formed between the outer water pump barrel 100 and the outer wall of the stator assembly 200; a second space 12 is formed between the outer wall of the rotor assembly 300 and the inner wall of the stator assembly 200;

a first flow passage is formed from the inlet 14 of the canned motor pump 10, the water inlet section of the guide shell 400, the water outlet section of the guide shell 400, the first space 11 to the outlet 15 of the canned motor pump 10;

a second flow passage is formed from the inlet 14 of the canned motor pump 10, the water inlet section of the guide shell 400, the bearing 600 to the second space 12 to the outlet 15 of the canned motor pump 10.

The canned motor pump 10 of this embodiment has a first flow path and a second flow path that are independent of each other. Wherein the first flow channel is capable of introducing fluid from an inlet 14 of the canned motor pump 10 into the first space 11 and delivering it to an outlet 15 of the canned motor pump 10; the first flow path is thus able to pump fluid from the inlet 14 to the outlet 15 and to cool the stator assembly 200 in the first space 11 with the fluid. The second flow path is capable of introducing fluid from the inlet 14 of the canned motor pump 10, through the bearing 600, into the second space 12, and delivering it to the outlet 15 of the canned motor pump 10; here the second flow path is capable of both pumping fluid from the inlet 14 to the outlet 15 and cooling the bearing 600, rotor assembly 300 of the second space 12 with the fluid. To sum up, the first runner and the second runner can satisfy the transport of convection cell promptly, can ensure the cooling of stator module 200, rotor subassembly 300 and bearing 600 again, and it has improved prior art and has set up the coolant liquid alone and carry out refrigerated mode, can also ensure fluidic normal pump sending, consequently has simple structure, convenient to use, characteristics that economic benefits is good.

In the embodiment, the wall thickness of the water pump outer cylinder 100 is 1.2-3mm, preferably 2 mm. The outer water pump barrel 100 is made of 304 stainless steel and is manufactured by adopting a unilateral plastic deformation process.

Compared with the materials such as plastic materials in the prior art, the water pump outer cylinder 100 has the characteristics of good strength, stable structure, good processing technology, good coaxiality and good sanitary cleanliness, and has better rigidity to adapt to the pressure of a pumping medium.

Please continue to refer to fig. 1 to 7 for further structural details.

Further, as can be seen from the figure, stator assembly 200 includes a stator outer cylinder 210, a stator inner cylinder 220, a stator winding 230, and a hermetic end piece 240.

The stator outer cylinder 210 and the stator inner cylinder 220 are both cylindrical structures with the same height, and the diameter of the stator outer cylinder 210 is larger than that of the stator inner cylinder 220. The stator inner cylinder 220 is disposed in the cylindrical space of the stator outer cylinder 210, and the stator inner cylinder 220 is arranged concentrically with the stator outer cylinder 210. In this way, the stator inner barrel 220 and the stator outer barrel 210 enclose an accommodating space 201 for accommodating the stator winding 230. The accommodation space 201 has a first end and a second end in a direction from the inlet 14 to the outlet 15 of the canned motor pump 10.

The sealing end pieces 240 are respectively provided at both ends of the stator outer cylinder 210 to seal the accommodating space 201. Further containment end piece 240 includes a first end piece 241 and a second end piece 242. The first end part 241 is arranged at one side of the stator outer cylinder 210 and the stator inner cylinder 220 close to the inlet 14 of the canned motor pump 10 to seal the first end of the accommodating space 201; the second end 242 is disposed on a side of the stator outer barrel 210 and the stator inner barrel 220 close to the outlet 15 of the canned motor pump 10 to seal the second end of the accommodating space 201.

Such an arrangement not only ensures the tightness of stator winding 230 within stator assembly 200, but also facilitates assembly and maintenance of stator assembly 200.

Optionally, the first end piece 241 is a ring-disk structure. The end face of the first end piece 241 close to the stator outer cylinder 210 is provided with an annular first projection, and the first projection extends in a direction away from the inlet 14 of the canned motor pump 10.

The first protrusion and the outer edge of the first end piece 241 form a first step 243, and the stator outer cylinder 210 is clamped on the first step 243. The first protrusion and the inner edge of the first end piece 241 form a second step 244, and the stator inner cylinder 220 is clamped on the second step 244.

Optionally, the second end piece 242 is an annular disk-like structure. The outer edge of the second end piece 242 abuts against the end face of the stator outer cylinder 210. The inner edge of the second end piece 242 is provided with a third step 245, and the stator inner cylinder 220 is snapped onto this third step 245.

The canned motor pump 10 further includes an insulating paper 250; the insulating paper 250 is annularly arranged on the circumferential inner wall of the stator inner barrel 220; the insulation paper 250 is located at both ends of the stator inner tube 220 away from the stator windings 230 in the axial direction of the stator inner tube 220.

Further, along the axial direction of the stator inner cylinder 220, one end of the insulating paper 250 abuts against the first end part 241, and the other end of the insulating paper 250 abuts against the end face of the portion of the stator winding 230 attached to the stator inner cylinder 220; and along the axial direction of the stator inner cylinder 220, one end of the insulating paper 250 abuts against the second end piece 242, and the other end of the insulating paper 250 abuts against the end face of the part of the stator winding 230 attached to the stator inner cylinder 220.

The arrangement of the insulating paper 250 can effectively prevent the coil breakdown of the stator winding 230.

As can be seen, the canned motor pump 10 further includes a front cover 710, a front retaining cap 730, a front housing 720, an upper retaining bracket 760, a rear cover 740, and a rear housing 750.

Along the axial direction of the water pump outer cylinder 100, the front end cover 710 and the front shell 720 are respectively fixed on the inner wall and the outer wall of one end of the pump outer cylinder, and the rear end cover 740 and the rear shell 750 are respectively fixed on the inner wall and the outer wall of the other end of the pump outer cylinder; the front cover 710 encloses a third space 13 with the guide shell 400 for accommodating the impeller 500.

The third space 13 here is a disk-shaped space of an ellipsoid, the length of the major axis of which is greater than the radius of the circular impeller 500.

In the present embodiment, the front cover 710, the front fixing cover 730, the front housing 720, the upper fixing base 760, the rear cover 740 and the rear housing 750 are all circular ring disk-shaped structures.

Further, the front cover 710 and the rear cover 740 are respectively disposed at both ends of the water pump outer cylinder 100 in the longitudinal direction.

At one end of the water pump outer barrel 100 close to the inlet 14 of the canned motor pump 10, the outer peripheral wall of the front end cover 710 is sleeved on the inner wall of the water pump outer barrel 100, and the front end cover 710 and the inner wall of the water pump outer barrel 100 are sealed through a sealing element. And the inner wall of the front housing 720 is sleeved on the outer wall of the outer water pump cylinder 100. The front cover 710 and the front housing 720 together seal the end of the pump housing 100 near the inlet 14 of the canned motor pump 10. The front housing 720 is detachably coupled to the front cover 710 by a fixing cover 730.

At one end of the water pump outer barrel 100 close to the outlet 15 of the canned motor pump 10, the outer peripheral wall of the rear end cover 740 is sleeved on the inner wall of the water pump outer barrel 100, and the rear end cover 740 and the inner wall of the water pump outer barrel 100 are sealed through a sealing element. And the inner wall of the rear outer shell 750 is sleeved on the outer wall of the water pump outer cylinder 100. The rear end cap 740 cooperates with the rear housing 750 to seal the end of the pump housing 100 near the outlet 15 of the canned motor pump 10.

Further, the end of the water pump outer barrel 100 near the outlet 15 of the canned motor pump 10 is also provided with a radially extending bend. The bent portion is embedded in a narrow space formed by the rear end cap 740 and the rear housing 750. In this narrow space, another seal is provided between the side of the bent portion close to the outlet 15 of the canned motor pump 10 and the rear case 750.

In this embodiment, the front cover 710 includes a front disk 711 and a front end 712 connected to each other. The front end body 712 is a cylindrical barrel structure having a hollow passageway that forms the inlet 14 of the canned pump 10.

The front plate 711 has a flared open interior cavity that extends through the entire front plate 711. The lumen has a small end with a smaller cross-section and a large end with a larger cross-section. The opening of the small end communicates with the hollow passage of the front end cap 710. The large end part and the end surface of the guide shell 400 enclose to form a third space 13.

As can be seen, the end face of the impeller 500 adjacent to the front end cap 710 has an annular water inlet 510. The front cover 710 further includes a cylindrical extension port 713, and the extension port 713 is located between the front body 712 and the front disk 711. In this embodiment, the diameter of the extension port 713 is smaller than the diameter of the water inlet 510, and the extension port 713 extends deep into the water inlet 510 to form an inner orifice ring structure. The inner orifice ring structure has the effects of reducing the caliber, improving the lift and preventing backflow.

It is understood that in other embodiments of the present invention, the diameter of the extension port 713 may be larger than the diameter of the water inlet 510, and the water inlet 510 extends deep into the extension port 713 to form an outer port ring structure. Such an outer orifice structure has an effect of increasing the flow rate. This is merely an example and is not intended to be limiting.

Further, the front housing 720 is sleeved on the front body 712 of the front cover 710, and the disk surface of the front housing 720 abuts against the front disk 711 of the front cover 710. The outer circumferential surface of the fixing cap 730 is snapped on the inner circumferential surface of the front housing 720. The inner wall of the fixing cap 730 is provided with an internal thread, and the outer wall of the front body 712 is provided with an external thread. The inner wall of the fixing cap 730 is screw-coupled with the outer wall of the front end body 712 to firmly couple the front housing 720 with the front cover 710.

The rear end cap 740 includes a rear disc 741 and a rear body 742 that are connected to each other. The rear body 742 is a cylindrical barrel structure with a hollow passage forming the outlet 15 of the canned pump 10. The rear disc 741 has a transition space with a U-shaped cross-sectional shape. In the direction away from the outlet 15 of the canned motor pump 10, the intermediate space is on the side communicating with the second space 12 and on the side communicating with the first space 11. The other side of the transition space is in communication with the outlet 15 of the canned motor pump 10.

Optionally, the front cover 710 and the rear cover 740 are integrally formed by cast steel. The arrangement mode has the advantages of being good in structural strength and assembly reliability, and the problems of installation errors and leakage caused by the matching of multiple parts are solved better.

Further, along the axial direction of the water pump outer cylinder 100, one end of the upper fixing seat 760 abuts against the front end cover 710 through the guide shell 400, and the other end of the upper fixing seat 760 is connected with the rear end cover 740 through a connecting rod; one end of the rotor assembly 300 is rotatably disposed on the upper fixing base 760 through the bearing 600, and the other end of the rotor assembly 300 is disposed on the rear cover 740 through the bearing 600.

The upper fixing base 760 is connected with the rear end cap 740 by a connecting rod, so that the overall structural stability of the canned motor pump 10 is further enhanced.

As can be seen from the figure, the impeller 500 is fixedly disposed at one end of the rotating shaft 310, so that when the rotating shaft 310 rotates, the impeller 500 is driven to rotate.

The guide shell 400 is located in the water pump outer barrel 100, and a radial outer wall of the guide shell 400 abuts against the water pump outer barrel 100. The rotation shaft 310 penetrates the middle of the guide shell 400.

Along the axial direction of the water pump outer cylinder 100, one end of the guide shell 400 abuts against the end face of the front disc 711 of the front cover 710, and one side of the guide shell 400 away from the front cover 710 is provided with an annular concave part. One end of the upper fixing base 760 close to the diversion shell 400 is provided with an annular clamping portion, and the clamping portion is clamped and matched with the recessed portion. The first end piece 241 of the stator assembly 200 abuts against the side of the upper fixing base 760 away from the guide shell 400.

The diameter of the upper fixing base 760 is smaller than that of the guide shell 400, so as to ensure the smoothness of the first flow passage. At one end of the rotating shaft 310 close to the inlet 14 of the canned motor pump 10, a bearing 600 is fixedly arranged on the inner wall of the upper fixed shell, and the rotating shaft 310 is rotatably arranged on the bearing 600; at one end of the rotating shaft 310 near the outlet 15 of the canned motor pump 10, a bearing 600 is fixedly disposed on the rear end cap 740, one end of the bearing 600 is communicated with the second space 12, the other end is communicated with the transition space, and the rotating shaft 310 is rotatably disposed on the bearing 600.

In this embodiment, the bearing 600 is provided with a guiding groove 610; the guide groove 610 is provided to penetrate in the axial direction of the bearing 600. The channel 610 serves to connect the third space 13 with the second space 12 and to connect the second space 12 with the transition space.

Optionally, in this embodiment, the bearing 600 is a graphite bearing 600 made of graphite. The graphite bearing 600 is a bushing structure, and the graphite bearing 600 and the rotating shaft 310 are matched by the sliding bearing 600.

Further, four guide grooves 610 are uniformly distributed in the circumferential direction on the bearing 600. And the four guiding grooves 610 are straight grooves arranged along the axial direction. Optionally, the diversion trench 610 may also be a chute or a spiral trench, but the straight-through trench has a characteristic of better water passing performance and can rapidly reduce the temperature of the bearing 600.

As can also be seen, the rotor assembly 300 includes a rotating shaft 310 and a rotor 320; the rotor 320 is fixedly arranged on the rotating shaft 310; the two ends of the rotating shaft 310 are rotatably connected to the bearings 600, respectively, to rotate the rotor 320.

Optionally, the rotor assembly 300 further comprises a spindle sleeve 330; the rotor 320 is fixed on the rotating shaft 310 through a rotating shaft sleeve 330. The length of the shaft sleeve 330 is greater than the length of the rotor 320. The second space 12 includes a space between the rotating shaft 310 and the inner stator barrel 220, a space between the rotating shaft sleeve 330 and the inner stator barrel 220, and a space between the rotor 320 and the inner stator barrel 220.

As can also be seen in the figure, the canned motor pump 10 further comprises a flow sensor and a pressure sensor. With the pressure sensor disposed in the transition space and the flow channel sensor disposed in the hollow passage of the rear end body 742 of the rear end cap 740.

In this embodiment, the canned motor pump 10 further includes a control device 800 disposed at the bottom of the water pump outer casing 100. Further, the control device 800 includes a cylindrical control box 810, a plate-shaped bottom case 820, and an aluminum member 830, a pressing plate 840, a controller 850, and a power cord 860. One side of the control box 810 close to the outer water pump barrel 100 is respectively clamped with the front end cover 710 and the rear end cover 740, and one side of the control box 810 far away from the outer water pump barrel 100 is respectively in threaded connection with the front end cover 710 and the rear end cover 740 through bolts. The control box 810 and the bottom case 820 enclose a closed box-shaped space.

The aluminum member 830 is clamped in the control box 810, and the aluminum member 830 is connected to the outer water pump barrel 100 in a propping manner. The aluminum member 830 has a good conductive effect, so that the grounding effect of the shield pump 10 is ensured.

The aluminum member 830 also has an extension member adjacent to the bottom case 820, on which the controller 850 is disposed through the pressing plate 840.

Further, the controller 850 is adhered to the pressing plate 840 by epoxy, and the whole of the two is fixed to the aluminum member 830. Compared with the mode that the controller 850 is directly fixed on the aluminum piece 830 in the prior art, the controller 850 is more convenient to replace due to the arrangement, and the controller 850 is attached to the outer face of the water pump outer barrel 100 through the pressing plate 840 and the aluminum piece 830, so that heat can be directly taken away through water flow, and the heat dissipation effect is realized.

Both the flow sensor and the pressure sensor are connected to the controller 850. One end of the power cord 860 is connected to the controller 850, and the other end of the power cord 860 extends away from the control box 810.

Optionally, the controller 850 here uses a low frequency hertz signal. Compared with the Bluetooth connection in the prior art, the method has the characteristics of good wall penetration and high sensitivity.

In use, stator assembly 200 is energized and stator windings 230 produce a changing magnetic field that rotates rotor 320. Because the rotor 320 is fixedly connected to the rotating shaft 310, the impeller 500 on the rotating shaft 310 rotates simultaneously when the rotor 320 rotates. Specifically, after the water pump is started, the rotating shaft 310 drives the impeller 500 and the water to rotate at a high speed, and the water is centrifugally thrown to the outer edge of the impeller 500, so that the water flow starts to move. A part of water flows from the third space 13 into the first space 11 through the flow channel of the volute-shaped guide shell 400, and then is pumped from the transition space to the outlet 15 on the rear end cover 740, so that a first flow channel is formed; another part of the water flow enters the second space 12 from the third space 13 through the guiding groove 610 of the front end bearing 600, then enters the transition space from the second space 12 through the guiding groove 610 of the rear end bearing 600, and then is pumped to the outlet 15 on the rear end cover 740, so that a second flow passage is formed.

The arrangement of the first flow passage and the second flow passage can meet the requirement of conveying fluid, and the stator assembly 200, the rotor assembly 300 and the bearing 600 can be cooled by using the pumped fluid, and the cooling effect is excellent.

In a second aspect, the present invention provides a water supply system comprising a water supply pipe, a water outlet end and the canned motor pump 10 of any one of the preceding embodiments; the inlet 14 of the canned motor pump 10 is connected to a water supply line and the outlet 15 of the canned motor pump 10 is connected to a water outlet.

Further, the outlet 15 of the canned motor pump 10 may be connected to a filter device or a drinking terminal. Thus, the canned motor pump 10 can be used as a water purification system; the pressure of the fluid can be improved, so that a user can be guaranteed to have better water using experience.

In summary, the embodiment of the present invention provides a canned motor pump 10 and a water supply system, which have at least the following advantages:

the arrangement of the first flow channel and the second flow channel can meet the requirement of conveying the fluid;

the stator assembly 200, the rotor assembly 300 and the bearing 600 can be cooled by the pumped fluid, and the cooling effect is excellent;

the whole structure is simpler, and the use space is saved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A canned pump (10) comprising:

the water pump comprises a water pump outer cylinder (100), a stator assembly (200), a rotor assembly (300) and a guide shell (400);

the stator assembly (200) in the shape of an annular cylinder is hermetically arranged in the water pump outer cylinder (100), and the rotor assembly (300) is rotatably arranged in the middle of the stator assembly (200) through a bearing (600);

a first space (11) is formed between the outer water pump barrel (100) and the outer wall of the stator assembly (200); a second space (12) is enclosed between the outer wall of the rotor assembly (300) and the inner wall of the stator assembly (200);

forming a first flow passage from an inlet (14) of the canned motor pump (10), a water inlet section of the guide shell (400), a water outlet section of the guide shell (400), to the first space (11), to an outlet (15) of the canned motor pump (10);

a second flow passage is formed from the inlet (14) of the canned motor pump (10), the water inlet section of the guide shell (400), the bearing (600) to the second space (12) to the outlet (15) of the canned motor pump (10).

2. The canned pump (10) of claim 1, wherein:

a guide groove (610) is arranged on the bearing (600);

the guide groove (610) penetrates along the axial direction of the bearing (600).

3. The canned pump (10) of claim 2, wherein:

the bearing (600) is a graphite bearing (600);

the graphite bearing (600) is rotatably coupled to the rotor assembly (300).

4. The canned pump (10) of claim 1, wherein:

the rotor assembly (300) comprises a rotating shaft (310) and a rotor (320);

the rotor (320) is fixedly arranged on the rotating shaft (310); two ends of the rotating shaft (310) are respectively rotatably connected with the bearings (600) to drive the rotor (320) to rotate.

5. The canned pump (10) of claim 4, wherein:

the rotor assembly (300) further comprises a spindle sleeve (330);

the rotor (320) is fixedly arranged on the rotating shaft (310) through the rotating shaft sleeve (330).

6. The canned pump (10) of claim 1, wherein:

the stator assembly (200) comprises a stator outer cylinder (210), a stator inner cylinder (220), a stator winding (230) and a closed end piece (240);

the stator inner barrel (220) and the stator outer barrel (210) are arranged concentrically to form an accommodating space (201) for accommodating the stator winding (230);

the sealing end piece (240) is respectively connected with the stator outer cylinder (210) and the stator inner cylinder (220) to seal the accommodating space (201).

7. The canned pump (10) of claim 6, wherein:

the canned motor pump (10) further comprises an insulating paper (250);

the insulating paper (250) is arranged on the inner wall of the stator inner cylinder (220);

and along the axial direction of the stator inner cylinder (220), the insulating paper (250) is positioned at two ends of the stator inner cylinder (220) far away from the stator winding (230).

8. The canned pump (10) of claim 1, wherein:

the canned motor pump (10) further comprises a front end cap (710), a front housing (720), a rear end cap (740), and a rear housing (750);

along the axial direction of the water pump outer cylinder (100), the front end cover (710) and the front shell (720) are respectively fixed on the inner wall and the outer wall of one end of the pump outer cylinder, and the rear end cover (740) and the rear shell (750) are respectively fixed on the inner wall and the outer wall of the other end of the pump outer cylinder;

the front end cover (710) and the guide shell (400) enclose to form a third space (13) for accommodating an impeller (500).

9. The canned pump (10) of claim 8, wherein:

the shielding pump (10) further comprises an upper fixed seat (760) and a connecting rod;

along the axial direction of the water pump outer cylinder (100), one end of the upper fixed seat (760) is abutted against the front end cover (710) through the diversion shell (400), and the other end of the upper fixed seat (760) is connected with the rear end cover (740) through a connecting rod;

one end of the rotor assembly (300) is rotatably disposed on the upper fixing seat (760) through the bearing (600), and the other end of the rotor assembly (300) is disposed on the rear end cover (740) through the bearing (600).

10. A water supply system, comprising:

a water supply pipe, a water outlet end and a canned motor pump (10) according to any of claims 1 to 9;

an inlet (14) of the canned motor pump (10) is connected with the water supply pipe, and an outlet (15) of the canned motor pump (10) is connected with the water outlet end.