CN117662484A

CN117662484A - Canned motor pump

Info

Publication number: CN117662484A
Application number: CN202211067538.5A
Authority: CN
Inventors: 李钟薰; 金廷烈; 金龙澈; 赵在浩
Original assignee: Grundfos Holdings
Current assignee: Grundfos Holdings
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2024-03-08

Abstract

The invention provides a canned motor pump with good cooling effect, which comprises a motor, a pump, a bearing support part, a shaft and at least one blade. The motor comprises a stator and a rotor, a shielding sleeve is arranged between the stator and the rotor and seals the stator and the rotor, and the rotor is arranged in a shielding cavity formed by the shielding sleeve; the pump comprises a pump cavity and an impeller arranged in the pump cavity; the bearing support member is provided with a bearing; the shaft is arranged on the bearing, one end of the shaft is arranged in the shielding cavity and connected with the rotor, and the other end of the shaft is arranged outside the shielding cavity and connected with the impeller; at least one blade is disposed within the shielded cavity and is coupled to the shaft or rotor. The bearing supporting component is provided with a first flow passage, and the pump cavity is communicated with the shielding cavity through the first flow passage; the shaft has an axial through hole, and the pump chamber communicates with the shielding chamber through the through hole.

Description

Canned motor pump

Technical Field

The present invention relates to a canned motor pump.

Background

The canned motor pump includes motor and pump, and wherein the pump includes the impeller, and the motor includes stator, rotor and with two spacer shielding cover, the impeller of pump and the rotor of motor are installed on same epaxial, and the axle drives the impeller rotation and realizes the function of pumping fluid.

The shielding pump is internally provided with a flow passage communicated with the pump cavity and the shielding cavity, and the shaft is internally provided with a through hole communicated with the pump cavity and the shielding cavity, so that the pump cavity, the flow passage, the shielding cavity and the through hole jointly form a circulation loop, and liquid circularly flows in the circulation loop in the working process of the shielding pump, thereby taking away heat generated by the motor and reducing the temperature of the motor.

However, in the existing canned motor pump, the liquid circulation speed is slow, and the cooling effect is poor, thereby influencing the performance and the service life of the canned motor pump.

Disclosure of Invention

It is an object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a canned motor pump with a good cooling effect.

According to one aspect of the invention, a canned pump includes a motor, a pump, a bearing support member, a shaft, and at least one blade. The motor comprises a stator, a rotor and a shielding sleeve which is positioned between the stator and the rotor and seals the stator and the rotor, and the rotor is positioned in a shielding cavity formed by the shielding sleeve; the pump comprises a pump cavity and an impeller arranged in the pump cavity; the bearing support member is provided with a bearing; the shaft is arranged on the bearing, one end of the shaft is arranged in the shielding cavity and connected with the rotor, and the other end of the shaft is arranged outside the shielding cavity and connected with the impeller; at least one blade is disposed within the shielded cavity and is coupled to the shaft or the rotor. The bearing supporting component is provided with a first flow passage, and the pump cavity is communicated with the shielding cavity through the first flow passage; the shaft has an axial through hole through which the pump chamber communicates with the shield chamber.

According to an embodiment of the invention, the shielding sleeve is in sealing connection with the bearing support member.

According to an embodiment of the invention, the shielding sleeve is cup-shaped, and the opening end of the shielding sleeve is connected with the bearing support part in a sealing way.

According to one embodiment of the invention, the bearing support part is provided with a support disc, the periphery of the support disc is in sealing connection with the shielding sleeve through a sealing ring, the bearing is positioned in the center of the support disc, and the first flow passage is positioned on the support disc.

According to one embodiment of the invention, the shielding sleeve is cylindrical, and two ends of the shielding sleeve are respectively connected with the shell of the motor in a sealing way.

According to an embodiment of the invention, the motor further comprises a rear mounting plate, the shielding sleeve is cylindrical, one end of the shielding sleeve is sealed with the bearing supporting part, and the other end of the shielding sleeve is sealed with the rear mounting plate to form the shielding cavity.

According to an embodiment of the invention, the bearing support member comprises a support disc, the periphery of which is in sealing connection with the shielding sleeve through a sealing ring, the bearing is positioned in the center of the support disc, and the first flow passage is positioned on the support disc.

According to an embodiment of the invention, the pump comprises a pump cover and a pump shell, wherein the pump cover is connected with the pump shell in a sealing way and forms the pump cavity, and the center of the pump shell is provided with the bearing supporting part.

According to an embodiment of the present invention, the pump chamber includes a first pump chamber and a second pump chamber, the first pump chamber is located in an end region near the shaft and communicates with the through hole, the second pump chamber is located in a region near the periphery of the impeller, the pump cover is provided with a second flow passage, the second flow passage communicates the first pump chamber with the second pump chamber, and the first flow passage of the bearing support member communicates the second pump chamber with the shielding chamber.

According to an embodiment of the present invention, the pump chamber includes a first pump chamber and a second pump chamber, the first pump chamber is located at an end region near the shaft and communicates with the through hole, the second pump chamber is located at a region near the periphery of the impeller, and the first flow passage of the bearing support member communicates the second pump chamber with the shield chamber.

According to an embodiment of the invention, the rotor comprises a shaft, a rotor, a blade, a support plate, a blade and a blade.

According to an embodiment of the invention, the support plate is in a strip shape, the number of the blades is two, and the two blades are respectively arranged at two end parts of the support plate and are arranged in a central symmetry manner relative to the support plate, or the two blades are arranged in a symmetry manner relative to the longitudinal center line of the support plate.

According to one embodiment of the invention, the support plate is rectangular, the number of the blades is two, and the two blades are respectively arranged at the end parts of the two long sides of the support plate.

According to one embodiment of the invention, the support plate is in a cross shape, the number of the blades is 4, and the 4 blades are uniformly arranged along the circumferential direction.

According to one embodiment of the invention, the support plate is disc-shaped, the blades are multiple, and the multiple blades are uniformly arranged along the circumferential direction in a radial manner.

According to an embodiment of the present invention, the support plate and the blade are of an integral structure.

The invention has at least the following advantages or beneficial effects:

the shielding pump provided by the invention has the advantages that the blades are arranged in the shielding cavity and connected to the shaft or the rotor, so that the liquid in the shielding cavity can generate vortex along with the rotation of the shaft, the circulation efficiency of cooling liquid in the motor is increased, and the cooling liquid is circulated and accelerated, so that more heat is taken away.

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Drawings

FIG. 1 is a front view of a first embodiment of a canned motor pump of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3A is a cross-sectional view taken along the A-A plane in FIG. 2;

FIG. 3B shows a schematic view of the circulating fluid in a first embodiment of a canned motor pump of the present invention;

FIG. 4 is a front view of a first vane in the canned motor pump of the present invention;

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a top view of FIG. 4;

FIG. 7 is a perspective view of a second vane in the canned motor pump of the present invention;

fig. 8 is a front view of fig. 7;

FIG. 9 is a side view of FIG. 7;

FIG. 10 is a perspective view of a third vane in the canned motor pump of the present invention;

fig. 11 is a front view of fig. 10;

FIG. 12 is a side view of FIG. 10;

FIG. 13 is a schematic view of a second embodiment of a canned motor pump according to the present invention;

fig. 14 is a schematic view of another embodiment of the canned motor pump of the present invention.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

The invention relates to a shielding pump, which comprises a motor and a pump, wherein the motor comprises a stator, a rotor and a shielding sleeve for separating the stator from the rotor, a shielding cavity is formed in the shielding sleeve, and the rotor of the motor is arranged on a shaft and is positioned in the shielding cavity. The shielding cavity is also provided with a blade capable of rotating along with the shaft, and the rotation of the blade enables fluid in the shielding cavity to generate vortex, so that the circulating power of the fluid in the shielding pump is increased, the fluid is enabled to circulate rapidly, and the cooling effect of the motor is obviously improved.

The invention is applicable to all canned pumps with a canned jacket, and the invention will be described in further detail below with two pump types as examples.

Example 1

As shown in fig. 1, 2 and 3A, a first embodiment of the canned pump of the present invention includes a motor 1, a pump 2, a bearing support member, a shaft 18 and a vane 3.

The motor 1 includes a front mounting plate 11, a rear mounting plate 12, a motor front cover 13, a motor rear cover 14, a motor case 15, a shield 16, a stator 17, and a rotor 19.

The front mounting plate 11 and the rear mounting plate 12 are arranged oppositely and can be connected together through connecting pieces such as bolts 10; the motor front cover 13 and the motor rear cover 14 are arranged oppositely, wherein the motor front cover 13 is arranged on the front mounting disc 11 in a sealing way, and the motor rear cover 14 is arranged on the rear mounting disc 12 in a sealing way; the motor shell 15 is cylindrical and is hermetically arranged between the motor front cover 13 and the motor rear cover 14; the shielding sleeve 16 is cylindrical, one end of the shielding sleeve 16 is hermetically installed on the front installation disc 11, the other end of the shielding sleeve is hermetically installed on the rear installation disc 12, the inner diameter of the shielding sleeve 16 is smaller than that of the motor casing 15, and the shielding sleeve 16 is positioned in the motor casing 15 and coaxially arranged with the motor casing 15; the stator 17 is fixedly arranged in an annular space formed by the shielding sleeve 16 and the motor casing 15; the front mounting plate 11, the shielding sleeve 16 and the rear mounting plate 12 together form a shielding cavity 160, the rotor 19 is arranged in the shielding cavity 160, and the shielding cavity 160 is filled with liquid during the operation of the shielding pump.

In the present invention, the shield 16 seals the stator 17 from the rotor 19 to prevent leakage of fluid from the shield chamber 160.

The bearing support member includes a support plate with a perimeter sealed to the shield by a seal ring, the bearing being centered on the support plate and the first flow passage 40 being located on the support plate. In the first embodiment, the front mounting plate 11 may be used as a bearing support member, and the periphery of the front mounting plate 11 is sealed with the shield case 16 by a seal ring, and a bearing is provided at the center.

The pump 2 includes a pump head 21, a pump housing 22, and an impeller 23. The pump head 21 is connected to the front mounting plate 11 by bolts 20 or the like; the pump shell 22 is arranged between the front mounting plate 11 and the pump top cover 21 in a sealing way, and a pump cavity is formed between the pump top cover 21 and the pump shell 22; the impeller 23 is disposed within the pump chamber. The pump case 22 may serve as a bearing support member, and a bearing 220 is provided at a central position of the pump case 22; the front mounting plate 11 of the motor may be used as a bearing support member, and the front mounting plate 11 is provided with a bearing 110 at a central position.

The shaft 18 is supported on the bearing 220 and the bearing 110, one end of the shaft extends into the shielding cavity 160, and the other end of the shaft extends into the pump cavity of the pump 2; the rotor 19 and impeller 23 are both mounted on the shaft 18. The shaft 18 is provided with a through hole 180 along the axial direction thereof, and both ends of the through hole 180 are respectively communicated with the pump chamber and the shielding chamber 160.

The pump chambers include a first pump chamber 24 of lower pressure and a second pump chamber 25 of higher pressure. Wherein the first pump chamber 24 is a region near the shaft 18, that is, the through hole 180 of the shaft 18 communicates with the first pump chamber 24, and the second pump chamber 25 is a region near the outer periphery of the impeller 23.

A lubrication cavity 26 is arranged between the front mounting plate 11 and the pump shell 22, and a flow passage is arranged between the lubrication cavity 26 and the bearings 110 and 220. The pump housing 22 serving as a bearing support member and the front mounting plate 11 are respectively provided with first flow passages 40 communicating with each other, the first flow passages 40 located in the pump housing communicating the second pump chamber 25 with the lubrication chamber 26, and the first flow passages 40 located in the mounting plate communicating the lubrication chamber 26 with the shielding chamber 160. The pump top cover 21 is provided with a second flow passage 50, the second flow passage 50 is communicated with the second pump cavity 25, and the first flow passage 40 is communicated with the shielding cavity 160, so that a circulation loop is formed by the second pump cavity 25, the first flow passage 40, the shielding cavity 160, the through hole 180 of the shaft 18, the first pump cavity 24 and the second flow passage 50. The liquid flows in the circulation loop to take away the heat generated by the motor, so as to play a role in cooling the motor; meanwhile, the liquid impregnates the bearing 220 and the bearing 110, and plays a role in lubricating the bearing.

In the first embodiment of the canned pump, at least one vane 3 is disposed in the canned chamber 160, and the vane 3 can rotate along with the shaft 18. In detail, as shown in fig. 3A, the blades 3 are fixed to the end of the shaft 18 in the shield chamber 160, and in other embodiments, the blades 3 may be fixed to the rotor 19. The specific configuration of the vane 3 may vary so long as it is capable of swirling the liquid in the shield chamber 160 as the shaft 18 rotates to thereby accelerate the circulation of the liquid, as will be exemplified below.

As shown in fig. 4, 5 and 6, the two blades 3 are respectively fixed at the long side end parts of a strip-shaped, e.g. rectangular, support plate 30, and the two blades 3 are arranged in a central symmetry manner relative to the center of the support plate 30, so that the stress balance in the rotation process is facilitated; in other embodiments, two blades 3 may be fixed to the short side of the rectangular support plate 30, and the two blades 3 may be axisymmetrically arranged with respect to the support plate 30. The rectangular support plate 30 has a mounting portion 31 at the middle thereof, and the mounting portion 31 is mounted on the shaft 18 (see fig. 3A).

As shown in fig. 7, 8 and 9, the blades 3 are 4 blades, the support plate 30 is in a cross shape, and has a mounting portion 31 at the center and 4 arms uniformly arranged in the circumferential direction of the mounting portion 31, the arms may be rectangular, for example, the 4 blades 3 are respectively fixed on the long sides of the 4 rectangular arms, and the 4 blades 3 are arranged in a central symmetry manner with respect to the center of the support plate 30; in other embodiments, 4 blades 3 may be fixed to the short sides of the 4 arms, and the 4 blades 3 may be axially symmetrically arranged with respect to the support plate 30.

As shown in fig. 10, 11 and 12, the support plate 30 has a disc shape with a centrally located mounting portion 31, and the number of blades 3 is 2, 3, 4 or more, 4 being shown in fig. 10. The blades 3 are radially and uniformly arranged on the disc-shaped support plate 30, and the blades 3 are arranged in a central symmetry manner relative to the center of the support plate 30; in other embodiments, the plurality of blades 3 may be arranged axisymmetrically with respect to the support plate 30.

Referring to fig. 3B, in conjunction with fig. 3A, during operation of the canned motor pump, the cooling liquid flows from the second pump chamber 25 with relatively high pressure through the first flow channel 40 and the lubrication chamber 26 in sequence into the canned chamber 160, flows to the first pump chamber 24 with relatively low pressure through the through hole 180 of the shaft 18, and returns to the second pump chamber 25 through the second flow channel 50, thereby taking away heat generated by the motor 1. In the present invention, the vane 3 is installed on the shaft 18, and the rotation of the vane 3 generates a vortex and additional pressure to the cooling liquid in the shielding chamber 160, so that the backflow to the first pump chamber 24 through the through hole 180 can be accelerated, thereby improving the cooling efficiency. The motor temperature of the canned motor pump with the vane 3 according to the invention was tested under the same conditions, which was significantly lower than that of a conventional canned motor pump without the vane 3.

Example two

As shown in fig. 13, a second embodiment of the canned pump of the present invention includes a motor 1, a pump 2, a bearing support member, a shaft 18, and a vane 3.

The motor 1 includes a motor housing 15, a shield 16, a stator 17, and a rotor 19.

The motor housing 15 has an open end that is sealingly connected to the first bearing support member 41.

The shielding sleeve 16 is cup-shaped, and the first bearing support member 41 at the opening end of the shielding sleeve 16 is in sealing connection, and the shielding sleeve 16 and the first bearing support member 41 jointly form a shielding cavity 160. In this second embodiment, the first bearing support member 41 includes a support plate with a bearing 410 provided in the center thereof.

The inner diameter of the shielding sleeve 16 is smaller than that of the motor casing 15, and is positioned in the motor casing 15 and coaxially arranged with the motor casing 15; the stator 17 is fixedly arranged in an annular space formed by the shielding sleeve 16 and the motor casing 15; the rotor 19 is arranged in a shielding chamber 160, and the shielding chamber 160 is filled with liquid during operation of the shielding pump.

The pump 2 includes a pump housing 22 and an impeller 23. The pump casing 22 is sealingly connected to the first bearing support member 41, a pump chamber is formed in the pump casing 22, and the impeller 23 is disposed in the pump chamber.

A second bearing support member 42 is fixed to the bottom of the shield case 16 in the shield chamber 160, and a bearing 420 is provided at the center of the second bearing support member 42.

Shaft 18 is supported on bearings 410 and 420, a majority of shaft 18 is located within shielded cavity 160, and one end of shaft 18 extends into the pump cavity of pump 2; the rotor 19 and impeller 23 are both mounted on the shaft 18. The shaft 18 is provided with a through hole 180 along the axial direction thereof, and both ends of the through hole 180 are respectively communicated with the pump chamber and the shielding chamber 160.

The pump chambers include a first pump chamber 24 of lower pressure and a second pump chamber 25 of higher pressure. Wherein the first pump chamber 24 is a region near the suction inlet of the impeller 23, that is, the through hole 180 of the shaft 18 communicates with the first pump chamber 24, and the second pump chamber 25 is a region near the back of the impeller 23.

The first bearing support member 41 is provided with a flow passage 411, and the flow passage 411 communicates the second pump chamber 25 with the shielding chamber 160. The flow channel 411 may be one or more drilled holes or one or more small holes that are laser fired. The second pump chamber 25, the first flow passage 411, the shielding chamber 160, the through hole 180 of the shaft 18, and the first pump chamber 24 thus form a circulation loop. The liquid flows in the circulation loop to take away the heat generated by the motor, so as to play a role in cooling the motor; and simultaneously, the lubricating effect on the bearings 410 and 420 is achieved.

In the second embodiment of the canned pump, at least one vane 3 is disposed in the canned chamber 160, and the vane 3 can rotate along with the shaft 18. In detail, as shown in fig. 13, the blade 3 is fixed to the front side of the rotor 19, that is, the side close to the motor front cover 13.

In other embodiments, the blade 3 may also be secured to the rear side of the rotor 19 as shown in fig. 14.

The specific structure of the vane 3 may be varied, so long as the vane can rotate along with the shaft 18 to generate vortex in the liquid in the shielding cavity 160 so as to accelerate the circulation of the liquid, for example, the vane structure listed in the first embodiment may be applied to the second embodiment, and will not be described herein.

In the application embodiments, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the embodiments of the application will be understood by those skilled in the art according to the specific circumstances.

In the description of the present embodiments, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of describing the present embodiments and simplifying the description, and do not indicate or imply that the apparatus or unit in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present embodiments.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an application embodiment. In this specification, schematic representations of the above terms do not necessarily refer to the same implementations or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the application embodiment, and is not intended to limit the application embodiment, and various modifications and changes may be made to the application embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims

1. A canned motor pump, comprising:

an electric machine (1), the electric machine (1) comprising a stator (17), a rotor (19), and a shielding sleeve (16) between the stator (17) and the rotor (19) and sealing the two, the rotor (19) being located in a shielding cavity (160) formed by the shielding sleeve (16);

a pump (2), wherein the pump (2) comprises a pump cavity and an impeller (23) arranged in the pump cavity;

a bearing support member provided with a bearing;

a shaft (18) arranged on the bearing, one end of the shaft is arranged in the shielding cavity (160) and connected with the rotor (19), and the other end of the shaft is arranged outside the shielding cavity (160) and connected with the impeller (23); and

at least one blade (3) arranged in a screening chamber (160) and connected to the shaft (18) or the rotor (19),

wherein, a first runner (40) is arranged on the bearing supporting part, and the pump cavity is communicated with the shielding cavity (160) through the first runner (40); the shaft (18) has an axial through-hole (180), and the pump chamber communicates with the shield chamber (160) through the through-hole (180).

2. The canned motor pump as set forth in claim 1 wherein: the shield (16) is sealingly connected to the bearing support member.

3. The canned motor pump as set forth in claim 2 wherein: the shielding sleeve (16) is cup-shaped, and one opening end of the shielding sleeve is in sealing connection with the bearing supporting part.

4. A canned motor pump as claimed in claim 3, characterized in that: the bearing supporting part is provided with a supporting disc, the periphery of the supporting disc is in sealing connection with the shielding sleeve (16) through a sealing ring, the bearing is positioned at the center of the supporting disc, and the first runner (411) is positioned on the supporting disc.

5. The canned motor pump as set forth in claim 1 wherein: the shielding sleeve (16) is cylindrical, and two ends of the shielding sleeve (16) are respectively connected with the shell of the motor in a sealing way.

6. The canned motor pump as set forth in claim 1 wherein: the motor further comprises a rear mounting plate (12), the shielding sleeve (16) is cylindrical, one end of the shielding sleeve is sealed with the bearing supporting part, and the other end of the shielding sleeve is sealed with the rear mounting plate (12) to form the shielding cavity (160).

7. The canned motor pump as set forth in claim 6 wherein: the bearing support part comprises a support disc, the periphery of the support disc is in sealing connection with the shielding sleeve (16) through a sealing ring, the bearing is positioned at the center of the support disc, and the first runner (40) is positioned on the support disc.

8. The canned motor pump as set forth in claim 6 wherein: the pump (2) comprises:

the pump cover (21) is connected with the pump shell (22) in a sealing way, and forms the pump cavity, wherein the bearing supporting part is arranged in the center of the pump shell (22).

9. The canned motor pump as set forth in claim 8 wherein: the pump cavity comprises a first pump cavity (24) and a second pump cavity (25), the first pump cavity (24) is located near the end area of the shaft (18) and is communicated with the through hole (180), the second pump cavity (25) is located near the area of the periphery of the impeller, the pump cover (21) is provided with a second flow passage (50), the second flow passage (50) is communicated with the first pump cavity (24) and the second pump cavity (25), and the first flow passage (40) of the bearing supporting component is communicated with the second pump cavity (25) and the shielding cavity (160).

10. The canned motor pump as set forth in claim 4 wherein: the pump cavity comprises a first pump cavity (24) and a second pump cavity (25), the first pump cavity (24) is located in an end area close to the shaft (18) and is communicated with the through hole (180), the second pump cavity (25) is located in an area close to the periphery of the impeller, and the first runner (411) of the bearing supporting component is communicated with the second pump cavity (25) and the shielding cavity (160).

11. The canned motor pump according to any of claims 1-10 wherein: still include extension board (30), extension board (30) install in axle (18) or rotor (19) is last, blade (3) set up in extension board (30).

12. The canned motor pump as set forth in claim 11 wherein: the support plate (30) is in a strip shape, the number of the blades (3) is two, the two blades (3) are respectively arranged at two end parts of the support plate (30) and are arranged in a central symmetry manner relative to the support plate (30), or the two blades (3) are arranged in a central symmetry manner relative to the longitudinal central line of the support plate (30).

13. The canned motor pump as set forth in claim 12 wherein: the support plate (30) is rectangular, the number of the blades (3) is two, and the two blades (3) are respectively arranged at the end parts of the two long sides of the support plate (30).

14. The canned motor pump as set forth in claim 8 wherein: the support plates (30) are in a cross shape, the number of the blades (3) is 4, and the 4 blades (3) are uniformly arranged along the circumferential direction.

15. The canned motor pump as set forth in claim 8 wherein: the support plate (30) is disc-shaped, the blades (3) are multiple, and the multiple blades (3) are uniformly arranged in a radial manner along the circumferential direction.

16. The canned motor pump as set forth in claim 8 wherein: the support plate (30) and the blades (3) are of an integrated structure.