CN216111292U

CN216111292U - Shielding electric pump with motor shaft two-end transmission pump structure

Info

Publication number: CN216111292U
Application number: CN202120878428.1U
Authority: CN
Inventors: 刘翁帆; 邹志; 梁运晓; 李基伟; 吴乙民
Original assignee: Hanyu Group JSCL
Current assignee: Hanyu Group JSCL
Priority date: 2021-01-26
Filing date: 2021-04-26
Publication date: 2022-03-22
Anticipated expiration: 2031-04-26
Also published as: CN114790988A

Abstract

A canned motor pump of the type having a pump structure driven by each of two ends of a motor shaft, comprising: the pump comprises a pump shell, a rotor assembly, a first pump cover, a second pump cover and a stator assembly, wherein an upper impeller and a lower impeller are respectively driven by two ends of a rotating shaft of the rotor assembly; the method is characterized in that: the stator cavity is formed by the first pump cover and the pump shell, the stator cavity is used for accommodating the stator assembly, the tubular inner shell is provided with two open ends, the rotor assembly is accommodated in the inner cavity of the inner shell, the pressing plate is fixedly arranged at the other axial end of the pump shell and is sealed in a watertight manner, and the second pump cover and the pressing plate are in opposite covering fit to form a second impeller cavity for accommodating the lower impeller. The shield electric pump with the design has the advantages of fewer required parts and fewer installation procedures, simplified structure and improved assembly efficiency.

Description

Shielding electric pump with motor shaft two-end transmission pump structure

Technical Field

The utility model relates to a canned motor pump with a pump structure respectively driven at two ends of a motor shaft, and the IPC of the canned motor pump belongs to F04D13/06 or F04D 29/22.

Background

The electric canned motor pump of the prior art, in which two ends of a motor shaft respectively transmit a pump structure, as described in the prior application CN108999790A, a dual water outlet water pump, includes a housing, a middle plate, a sealing plate, a main shaft, a first impeller, a second impeller, a first side cover and a second side cover. The medium plate is equipped with fixed pipe, and medium plate fixed mounting on the shell and with the shell between form the installation cavity of installation stator. A first pump chamber for accommodating the first impeller is formed between the first side cover and the seal plate, and a second pump chamber for accommodating the second impeller is formed between the second side cover and the casing. The main shaft rotates and simultaneously drives the first impeller and the second impeller which are arranged on two sides of the main shaft to rotate, and double-side drainage of the water pump is realized. The rotating shaft of the structure needs to penetrate through parts such as a shell, a middle plate and a sealing plate which are assembled in a threaded mode, the centering performance is poor, the assembling difficulty is high, the structure is complex, and the reasonable installation of the control plate is not considered.

The terms and common general knowledge can be found in the mechanical engineering handbook, the motor engineering handbook and the centrifugal pump noun term of the national standard GB/T7021 and 2019, published in 1983 or 1997 edition of mechanical industry publishers.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the background art, the utility model provides the canned motor pump which has a simple structure, is easy to assemble and has a good sealing performance, and two ends of a motor shaft are respectively provided with a pump structure.

The technical scheme of the utility model is as follows:

a canned motor pump of the type having a pump structure driven by each of two ends of a motor shaft, comprising: pump case, rotor subassembly, first pump cover, second pump cover, stator module, rotor subassembly's pivot both ends respectively are fixed with last impeller and lower impeller, its characterized in that: the first pump cover and the pump shell are in facing cover fit at one axial end to form a first impeller cavity for accommodating the upper impeller, the pump shell is formed with a stator cavity for accommodating the stator assembly and a tubular inner shell with openings at two ends, the inner cavity of the inner shell accommodates the rotor assembly, the pressure plate is fixedly arranged at the other axial end of the pump shell and is sealed in a watertight manner in the stator cavity, and the second pump cover and the pressure plate are in facing cover fit to form a second impeller cavity for accommodating the lower impeller.

According to the technical scheme, the pump shell of the canned motor pump can be integrally molded into a stator cavity for accommodating the stator component and a tubular inner shell for accommodating the rotor component, wherein the two ends of the tubular inner shell are provided with openings, the stator component and the rotor component are coaxially arranged on the outer periphery and the inner periphery of the inner shell of the pump shell respectively during assembly, and the pressing plate is sealed in a watertight manner at the opening of the stator cavity of the pump shell, so that the stator cavity and the rotor component are installed. Therefore, the shield electric pump has the advantages of fewer required parts and installation procedures, simpler structure, particularly good concentricity of the stator and the rotor, contribution to improving the assembly efficiency and the motor efficiency and better sealing performance.

Furthermore, the concrete structure that the pressure plate is fixedly arranged at the other axial end of the pump shell and seals the stator cavity in a watertight manner is as follows: an annular first sealing ring is arranged between the shell of the pump shell and the pressure plate; an annular pressure plate groove is formed in one side, facing the stator cavity, of the pressure plate, the inner shell is inserted into the pressure plate groove, and a second sealing ring is arranged between the inner shell and the pressure plate. The structure is simple and the installation is easy.

Furthermore, the second sealing ring is a hollow cylindrical structure with an annular groove. This design is wrapped up the opening of inner shell with the second sealing washer and is inserted and install in the clamp plate inslot, has increased the seal area between inner shell and the clamp plate, promotes the leakproofness between inner shell and the clamp plate.

Furthermore, the axial single-side section of the second sealing ring is L-shaped, and a plurality of annular second sealing ring convex ribs are protruded on the circumferential cylindrical surface of the second sealing ring tightly attached to the pressure plate groove. The design is convenient for the gas in the pressure plate groove to be discharged from the gap between the contact surfaces of the inner shell and the pressure plate groove when the inner shell is inserted and installed in the pressure plate groove, and the assembly is facilitated.

Furthermore, the canned motor pump of a pump structure is respectively driven to two ends of the motor shaft further comprises a control plate and a side cover, the outer wall surface of the shell of the pump shell is protruded outwards to form a surrounding edge in an annular column shape, the side cover is fixedly arranged on the surrounding edge and forms an installation cavity for installing the control plate together with the surrounding edge, and a through hole for communicating the stator cavity with the installation cavity is formed in the outer wall surface. The pump with the design has high integration degree and small whole volume.

Furthermore, the shielding electric pump with the pump structure respectively driven by the two ends of the motor shaft further comprises a conducting rod, the conducting rod penetrates through the through hole, one end of the conducting rod is in contact with the iron core on the stator component, and the other end of the conducting rod is communicated with the control board. The design utilizes the conducting rod penetrating through the pump shell to conduct the iron core and the grounding wire on the control plate, the assembly is simple and reliable, and the grounding protection required by the implementation of product standards is achieved.

Furthermore, the electric shielding pump with the pump structure respectively driven by two ends of the motor shaft further comprises an annular elastic block arranged between the pressure plate and the iron core, the conductive rod is provided with a convex block protruding towards the iron core, and the annular elastic block tightly presses the conductive rod and abuts against the axial end face of the iron core. The design enables the contact between the conducting rod and the iron core to reach larger and stable pressure intensity, so that more reliable conduction is realized.

Furthermore, the shielding electric pump with the pump structure respectively driven by two ends of the motor shaft further comprises an upper bearing, a lower bearing and an annular third sealing ring, wherein the rotating shaft passes through the upper bearing, the lower bearing and the annular third sealing ring, and more than 2 annular third sealing ring convex ribs are radially protruded on the inner ring of the third sealing ring and tightly attached to the rotating shaft; the upper bearing is fixed on an annular end plate of the pump shell in an injection molding mode, and the third sealing ring is located between the magnetic core of the rotor assembly and the annular end plate and fixed on the annular end plate; or, the lower bearing is fixed on the pressing plate in an injection molding mode, and the third sealing ring is located between the magnetic core of the rotor assembly and the pressing plate and is fixed on the pressing plate. The design is simple and reliable in assembly, the exchange of liquid in the first impeller cavity and the second impeller cavity is reduced, and the sealing effect between the first impeller cavity and the second impeller cavity is improved.

Furthermore, the shielding electric pump with the motor shaft two ends respectively transmitting the pump structure further comprises a clamping piece used for fixedly mounting a third sealing ring, the clamping piece comprises a hollow columnar clamping piece body, a clamping hook arranged on the axial end face of the clamping piece body and a clamping piece boss radially protruding inwards at the inner ring of the clamping piece body, the third sealing ring is clamped on the clamping piece boss, and the clamping piece is clamped on the end plate or the pressing plate. This design makes the stable joint of third sealing washer on end plate or clamp plate, prevents that the third sealing washer from droing at the during operation.

Furthermore, the third sealing ring comprises a hollow columnar third sealing ring body, an outer sealing ring arranged on the periphery of the third sealing ring body and a transition connecting piece for connecting the outer sealing ring and the third sealing ring body, wherein an outer sealing ring groove is axially arranged on the outer sealing ring, a clamping piece convex rib is protruded on the axial end face of the clamping piece body, and the outer sealing ring groove is sleeved on the clamping piece convex rib. After the design, the third sealing ring can be clamped on the pump shell more tightly.

Furthermore, the shielding electric pump with the pump structure respectively driven by two ends of the motor shaft further comprises an upper bearing, a lower bearing and a hollow cylindrical fourth sealing ring, wherein the rotating shaft passes through the upper bearing, the lower bearing and the hollow cylindrical fourth sealing ring, and the inner ring of the fourth sealing ring is radially and inwards bulged by more than 2 annular fourth sealing ring convex ribs tightly attached to the rotating shaft; a concave bearing groove is formed in an annular end plate of the pump shell, a convex rib of the convex upper bearing groove or a concave end plate groove is formed in the radial direction of the bearing groove, and the upper bearing is sleeved with a fourth sealing ring and clamped on the bearing groove; or, a concave pressing plate bearing groove is formed in the axial end face of the pressing plate, a convex rib of the pressing plate bearing groove or a concave pressing plate groove is formed in the radial direction of the pressing plate bearing groove, and the lower bearing sleeve is provided with a fourth sealing ring and is clamped on the pressing plate bearing groove. The design reduces the exchange of liquid in the first impeller cavity and the second impeller cavity, and improves the sealing effect between the first impeller cavity and the second impeller cavity.

Furthermore, the canned motor pump with the motor shaft two ends respectively driving the pump structure further comprises an upper bearing, a lower bearing and an annular fifth sealing ring, wherein the rotating shaft penetrates through the upper bearing, the lower bearing and the annular fifth sealing ring, the annular end plate of the pump shell is recessed to form a first bearing groove, the fifth sealing ring is sleeved on the upper bearing and is arranged on the first bearing groove, the rotor assembly further comprises a plastic part fixed on the rotating shaft in an injection molding mode, a plurality of annular rotor convex ribs are arranged on the end face of the annular end plate, facing the pump shell, of the plastic part in a protruding mode, a plurality of annular pump shell convex ribs are arranged on the end face of the end plate, facing the plastic part in a protruding mode, and the rotor convex ribs and the pump shell convex ribs are inserted in a staggered mode to form a labyrinth sealing structure. According to the design, the fifth sealing ring is used for sealing the first impeller cavity and the inner shell, so that the first impeller cavity and the second impeller cavity are prevented from being mutually exchanged when different temperatures or different liquids are respectively arranged in the first impeller cavity and the second impeller cavity, and the application range of the pump is expanded.

Furthermore, the axial bulge of the upper bearing is exposed out of the annular end plate of the pump shell, and the axial bulge of the lower bearing is exposed out of the axial end surface of the pressure plate. When this design restriction rotor subassembly axial float, can avoid going up impeller and end plate and lower impeller and clamp plate to take place direct wear and tear and lead to damaging, promote the security of this pump.

Furthermore, the canned motor pump with the pump structure respectively driven by the two ends of the motor shaft further comprises impeller inserts respectively injected on the upper impeller and the lower impeller, and the impeller inserts axially protrude out of the outer end face of the shaft disc of the embedded impeller. The design avoids the direct contact abrasion between the impeller and the close bearing, and prolongs the service life of the impeller.

Furthermore, the two ends of the rotating shaft are respectively provided with an axial hole and a rotating shaft boss for assembling the upper impeller and the lower impeller, the rotating shaft boss is provided with flat positions which are radially symmetrical, and the impeller insert is provided with an insert hole with a flat position groove for the rotating shaft to penetrate into for assembling. The design is convenient for processing the rotating shaft, and improves the coaxiality of the assembled upper impeller and the assembled lower impeller.

Furthermore, the axial end face of the pressing plate is provided with a pressing plate through hole, and the second impeller cavity is communicated with a rotor cavity which is surrounded by the pressing plate and the inner shell and used for accommodating the rotor assembly through the pressing plate through hole. The through hole of the design communicates the second impeller cavity with the rotor cavity, and liquid in the impeller cavity can penetrate through the through hole of the pressing plate to dissipate heat of the magnetic core on the rotor assembly.

Furthermore, the upper impeller and the lower impeller are equidirectional impellers, namely both forward impellers or both backward impellers or both radial impellers, so that the vibration noise is favorably reduced.

Further, the outer diameter of the upper impeller is not equal to the outer diameter of the lower impeller. The design can ensure that the two pump structures are respectively used on equipment with different displacement requirements, and the application range of the pump is expanded.

Further, a side plate with a mounting hole is protruded on a radial end surface of the side cover. This design can let outside power cord be fixed in on the curb plate, does benefit to the arrangement of outside power cord.

The present invention will be described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic perspective view of a canned motor pump according to the present invention;

FIG. 2 is a schematic exploded view of a first embodiment of the canned motor pump of the present invention;

FIG. 3 is a cross-sectional view of a first embodiment of the canned motor pump of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a partial enlarged view of B in FIG. 3;

FIG. 6 is a cross-sectional view of a second embodiment of the canned motor pump of the present invention;

FIG. 7 is an enlarged view of a portion C of FIG. 6;

FIG. 8 is a cross-sectional view of a third embodiment of the canned motor pump of the present invention;

FIG. 9 is an enlarged view of a portion D of FIG. 8;

fig. 10 is a perspective view of the pump housing of the canned motor pump of the present invention;

FIG. 11 is a perspective view of another angle of the pump housing of the canned motor pump of the present invention;

FIG. 12 is a cross-sectional view of the impeller-equipped rotor assembly of the first embodiment of the canned motor pump of the present invention;

fig. 13 is a schematic perspective view of a second seal ring of the canned motor pump of the present invention;

fig. 14 is a perspective view of a third seal ring of the canned motor pump of the present invention;

FIG. 15 is a schematic perspective view of a shaft of the canned motor pump of the present invention;

FIG. 16 is a schematic perspective view of a platen of the canned motor pump of the present invention;

fig. 17 is a schematic perspective view of a second embodiment of the second seal ring of the canned motor pump of the present invention;

FIG. 18 is a cross-sectional view of a second embodiment of the canned motor pump of the present invention employing a second seal ring;

fig. 19 is a partial enlarged view of E in fig. 18;

FIG. 20 is a cross-sectional view of a fourth embodiment of the canned motor pump of the present invention;

FIG. 21 is an enlarged view of a portion F of FIG. 20;

fig. 22 is an exploded structural view of a third seal ring and a snap member in the fourth example;

wherein: 10-stator cavity, 11-rotor cavity, 20-mounting cavity, 30-stator assembly, 31-core, 40-first impeller cavity, 50-second impeller cavity, 60-screw, 70-rotor cavity, 100-pump casing, 100 ' -pump casing, 110-inner casing, 120-outer casing, 121-surrounding edge, 122-through hole, 140 ' -pump casing rib, 160-end plate, 160 ' -end plate, 161 ' -first bearing groove, 161 ' -end plate mounting groove, 163-end plate rib, 166 ' -bearing groove, 167 ' -bearing groove rib, 170-clamping piece, 171-clamping hook, 172-clamping piece boss, 173-clamping piece body, 174-ribs, 200-press plates, 210-press plate grooves, 220-press plate through holes, 230-central through holes, 300-rotor assembly, 300 '-rotor assembly, 310-rotating shaft, 311-axial holes, 312-rotating shaft boss, 320-magnetic core, 330-upper impeller, 331-upper blade, 340-lower impeller, 341-lower blade, 350-plastic part, 350' -plastic part, 351 '-rotor ribs, 361-upper bearing, 361' -upper bearing, 361 "-upper bearing, 363 '-upper bearing ribs, 362-lower bearing, 362' -lower bearing, 370-impeller insert, 371-insert holes, 380-rotating shaft screws, 400-control plate, 500-side cover, 510-side plate, 511-mounting holes, etc, 600-first pump cover, 610-first water inlet, 620-first water outlet, 700-second pump cover, 710-second water inlet, 720-second water outlet, 730-second pump cover convex rib, 810-first sealing ring, 820-second sealing ring, 820 '-second sealing ring, 821-annular groove, 821' -second sealing ring convex rib, 822-second sealing ring body, 830-fifth sealing ring, 840-annular elastic block, 850-fourth sealing ring, 851-fourth sealing ring convex rib, 860-third sealing ring, 860 '-third sealing ring, 861-third sealing ring convex rib, 861' -third sealing ring convex rib, 862 '-third sealing ring body, 863' -outer sealing ring, 864 '-transition connector, 865' -outer sealing ring groove, 920-conductive rod, 921-bump

Detailed Description

Referring to fig. 1 to 3, the canned motor pump according to the embodiments of the present invention, in which two ends of a motor shaft transmit one pump, includes a pump housing 100, a pressure plate 200 mounted on the pump housing 100, a rotor assembly 300 rotatably mounted on the pump housing 100, a stator assembly 30 mounted on the pump housing 100, a first pump cover 600 fixedly disposed on one axial side of the pump housing, and a second pump cover 700 fixedly disposed on the other axial side of the pump housing. Referring to fig. 12, the rotor assembly 300 includes a rotating shaft 310, a magnetic core 320, and a plastic part 350 that is injection-molded on the rotating shaft and fixedly connects the magnetic core to the rotating shaft. The first pump cover 600 is provided with a first water inlet 610 for water inflow and a first water outlet 620 for water supply and drainage, and the second pump cover 700 is provided with a second water inlet 710 for water inflow and a second water outlet 720 for water supply and drainage. Referring to fig. 3 and 10 to 12, the pump casing 100 is manufactured by one-time injection molding, and includes an annular end plate 160, a tubular inner casing 110 connected to the end plate 160 and having two open ends, and an outer casing 120 disposed on the outer periphery of the inner casing 100 and connected to the end plate 160, and the first pump cover 600 covers the end plate 160 of the pump casing to form the first impeller cavity 40 for accommodating the upper impeller 330. The inner casing 110, the outer casing 120 and the end plate 160 of the pump casing 100 enclose a stator cavity 10 therebetween, and the end plate 160 and the hollow inner cavity of the inner casing 110 enclose a rotor cavity 70. During assembly, the stator assembly 30 is fixed in the stator cavity 10, the rotor assembly 300 is accommodated in the rotor cavity 70, one end of the rotating shaft 310 penetrates through an opening of the inner shell 100 at one end of the end plate 160 and extends out of the end plate 160, the pressing plate 200 is fixed at the other end of the pump housing and seals the stator cavity 10 in a watertight manner, so that the other end of the rotating shaft 310 penetrates through a central through hole 230 formed in the pressing plate 200 and extends out of the pressing plate, the upper impeller 330 and the lower impeller 340 are respectively fixed at two ends of the rotating shaft 310, the first pump cover 600 and the end plate 160 of the pump housing are oppositely covered to form a first impeller cavity 40 for accommodating the upper impeller 330, and the second pump cover 700 and the pressing plate 200 are oppositely covered to form a second impeller cavity 50 for accommodating the lower impeller 340. The rotation of the rotating shaft 310 drives the upper impeller 330 and the lower impeller 340 to rotate simultaneously, so that the double-side drainage of the centrifugal pump is realized. The pump designed by the design has fewer parts and fewer installation procedures, is simple in structure, has good concentricity of the stator and the rotor, and is beneficial to improving the assembly efficiency and the pump efficiency.

In order to improve the integration degree of the pump and reduce the whole volume. Referring to fig. 3 and 11, the canned motor pump of the present invention, which drives a pump structure at both ends of a motor shaft, further includes a control plate 400 and a side cover 500. The outer wall surface of the outer casing 120 of the pump body protrudes outward and is integrally injection-molded with the outer casing to form a surrounding edge 121 in a ring column shape, and the side cover 500 is fixedly arranged on the surrounding edge 121 and surrounds the surrounding edge 121 to form the installation cavity 20. A through hole 122 for communicating the stator chamber 10 with the installation chamber 20 is provided on an outer wall surface of the casing 120, and the control board 400 is assembled in the installation chamber 20.

Referring to fig. 3, 4 and 13, one embodiment of the present invention for securing a pressure plate 200 to the other end of the pump housing and water-tightly sealing the stator cavity 10 is: the canned motor pump with a pump structure driven by each end of the motor shaft further comprises a first annular sealing ring 810 and a second annular sealing ring 820. The second seal ring 820 includes a second seal ring body 822 having a hollow annular pillar shape and an annular groove 821 provided axially on the second seal ring body 822. The pressure plate 200 is provided with an annular pressure plate groove 210 on the side facing the stator cavity 20. Referring to fig. 4, during assembly, the first seal ring 810 is disposed between the outer shell 120 of the pump housing and the pressure plate 200, and after the inner shell 110 of the pump housing is fitted in the annular groove 821 of the second seal ring 820, the inner shell 110 with the second seal ring 820 mounted thereon is tightly fitted and inserted into the pressure plate groove 210. Because the radial cross section of inner shell is smaller, if the conventional O type sealing washer of cover setting easily lets the inner shell produce the deformation on the inner shell, lead to leaking. Foretell design utilizes grooved cavity ring structure's sealing washer with the whole parcel of inner shell to embedding to the clamp plate inslot, when the sealing area of increase inner shell and clamp plate, can prevent that the inner shell deformation from producing the clearance and leading to leaking, promote sealed reliability.

Referring to fig. 17 to 19, another embodiment of the present invention in which a pressure plate 200 is fixed to the other end of the pump housing and water-tightly seals the stator cavity 10 is: the canned motor pump with a pump structure driven by each motor shaft further includes a first annular seal 810 disposed between the outer casing 120 of the pump casing and the pressure plate 200 and a second annular seal 820' disposed between the inner casing 110 and the pressure plate 200. The second sealing ring 820' is a hollow annular column, and the axial single-side section of the second sealing ring is in an L shape. The second seal ring 820 ' includes a plurality of annular second seal ring beads 821 ' protruding on the circumferential cylindrical surface of the second seal ring 820 '. The pressure plate 200 is provided with an annular pressure plate groove 210 on the side facing the stator cavity. During assembly, the second sealing ring 820 'is placed in the pressing plate groove 210, and then the inner shell 110 of the pump body is inserted into the pressing plate groove 210 to press the second sealing ring 820' tightly. The design is convenient for the gas in the pressure plate groove to be discharged from the gap between the contact surfaces of the inner shell and the pressure plate groove when the inner shell is inserted and installed in the pressure plate groove, and the assembly is facilitated. Of course, as other embodiments, the pressure plate may seal the stator cavity opening of the pump casing with a seal ring welded or otherwise applied in an annular configuration.

In order to conveniently implement the grounding protection, the shielding electric pump of the utility model, which respectively drives one pump structure at two ends of the motor shaft, further comprises a conductive rod 920. Referring to fig. 3 and 4, the conductive rod 920 passes through the through hole 122, and has one end contacting the stator core 31 of the stator and the other end in communication with the control board 400. Furthermore, in order to prevent the conductive rod 920 from shifting during operation and causing the conductive rod to be unable to contact with the iron core, the centrifugal pump of the present invention further includes an annular elastic block 840 disposed between the pressure plate 200 and the iron core 31, wherein the conductive rod 920 is provided with a raised projection 921, and the annular elastic block 840 abuts the projection 921 of the conductive rod against the iron core 31.

In order to limit the rotation of the rotor assembly, the plastic part or the magnetic core of the rotor assembly interferes with the axial end surface of the end plate or the pressure plate of the pump body due to axial movement. Referring to fig. 3 and 5, the canned motor pump of the pump structure, in which both ends of the motor shaft are driven, further includes an upper bearing 361 and a lower bearing 362 through which the rotating shaft is mounted. The upper bearing 361 is axially protruded to be exposed to the end plate 160 of the pump casing, and the lower bearing 362 is axially protruded to be exposed to the axial end surface of the pressure plate 200. This design can also avoid going up impeller and end plate and lower impeller and clamp plate to take place direct wear and tear and lead to damaging when the range of restriction rotor subassembly axial float, promotes the security of this pump.

Further, in order to avoid the direct contact abrasion between the upper impeller or the lower impeller and the upper bearing or the lower bearing, the service life of the upper impeller or the lower impeller is prolonged. Referring to fig. 12, the canned motor pump with a pump structure driven by each of the two ends of the motor shaft further includes an impeller insert 370 respectively injection-molded on the upper impeller 330 and the lower impeller 340, and the impeller insert 370 axially protrudes and is exposed out of the outer end surfaces of the shaft discs of the upper impeller 330 and the lower impeller 340.

Further, see fig. 12 and 15, to facilitate machining of the shaft and to improve the coaxiality of the assembled upper and lower impellers. The two ends of the rotating shaft 310 are respectively provided with an axial hole 311 and a rotating shaft boss 312 for assembling the upper impeller and the lower impeller, the rotating shaft boss 312 is provided with symmetrical flat positions, and the impeller insert 370 is provided with an insert hole 371 with a flat position groove. The symmetric flat positions on the rotating shaft boss 312 are specifically radial symmetric notches arranged on the end of the rotating shaft. During assembly, the insert holes 371 of the upper impeller 330 and the lower impeller 340 are inserted into the rotating shaft bosses 312 mounted on the rotating shaft, and then the upper impeller 330 and the lower impeller 340 are respectively fixed on the rotating shaft 310 by the rotating shaft screws 380.

Referring to fig. 3 and 16, a pressure plate through hole 220 is formed at an axial end surface of the pressure plate 200, and the pressure plate through hole 220 communicates the second impeller chamber 50 with the inner space of the inner casing 110. The through hole of this design communicates second impeller chamber with the inner shell, and the liquid in the impeller chamber can pass through the clamp plate through hole and dispel the heat to magnetic core 320 in the inner shell.

Referring to fig. 3, in order to facilitate the arrangement of the external power supply line, the motor shaft of the present invention is provided with side plates 510 protruding from the radial end surfaces of the side covers 500 of the canned motor pump of the pump structure, respectively, with mounting holes 511.

Referring to fig. 12, the upper impeller 330 of the present invention is provided with upper blades 331, and the lower impeller 340 is provided with lower blades 341. In order to ensure that the blades of the upper impeller and the lower impeller are in the same direction when the rotating shaft rotates. That is, in the mounted state, the rotational directions of the projections of the upper blade 331 and the lower blade 341 on the plane perpendicular to the axis are the same. The design can simultaneously improve the drainage efficiency of both sides of the centrifugal pump. Further, in the centrifugal pump having the both-end water discharge function according to the present invention, the outer diameter of the upper impeller 330 is not equal to the outer diameter of the lower impeller 340. The design can ensure that the pump is applied to equipment with different displacement requirements, and the application range of the pump is expanded.

The first embodiment is as follows:

referring to fig. 5, 10 and 14, in order to avoid the exchange of the liquids in the first impeller chamber and the second impeller chamber, the motor shaft of the present embodiment is provided with a pump canned motor pump at both ends thereof, and further includes a third annular sealing ring 860. The third sealing ring 860 includes more than 2 annular third sealing ring ribs 861 protruding radially from the inner ring for tightly adhering to the rotating shaft 310, and a locking groove 862 disposed on the axial end face. The upper bearing 361 is fixed on the annular end plate 160 of the pump shell by injection molding, the end plate 160 axially protrudes the first end plate rib 163 at one side facing the pressure plate, and the third sealing ring 860 passes through the rotating shaft 310 and then is clamped on the end plate rib 163 by the clamping slot 862. After the above design, the third sealing ring 860 is clamped between the magnetic core 31 of the rotor assembly and the end plate 160 of the pump housing. Of course, as other equivalent embodiments, the lower bearings of the canned motor pump, which respectively drive one pump structure at two ends of the motor shaft, are fixed on the pressure plate by injection molding, and the third sealing ring passes through the rotating shaft, is assembled between the magnetic core of the rotor assembly and the pressure plate, and is clamped and fixed on the pressure plate. After the design, the first impeller cavity or the second impeller cavity is sealed with the inner shell, so that liquid in the first impeller cavity is prevented from flowing to the second impeller cavity through the inner shell, and the pump can be suitable for pumping equipment with different temperatures and/or different liquids.

Example two:

the difference between this embodiment and the first embodiment is the structure that avoids the exchange of liquid in the first impeller cavity and the second impeller cavity. Referring to fig. 6 and 7, the canned motor pump of the present embodiment, in which the two ends of the motor shaft each transmit a pump structure, further includes a hollow cylindrical fourth sealing ring 850, and more than 2 annular fourth sealing ring ribs 851 tightly attached to the rotating shaft 310 are radially and inwardly protruded from an inner ring of the fourth sealing ring 850. In this embodiment, the end surface of the end plate 161 'of the pump body is recessed axially to form a bearing groove 166' with a radially protruding bearing rib 167 ', and the radially protruding upper bearing rib 363' of the upper bearing 361 'is sleeved with the fourth sealing ring 850 and clamped in the bearing groove 166' by the upper bearing rib 363 'and the bearing rib 167'. The bearing of this design is the joint on the end plate, the maintenance of being convenient for is changed. Of course, as an equivalent embodiment of this embodiment, the axial end surface of the pressing plate is provided with a concave pressing plate bearing groove, the outer periphery of the lower bearing is protruded with a lower bearing convex rib, the radial direction of the pressing plate bearing groove is protruded with a pressing plate bearing groove convex rib, and the lower bearing sleeve is clamped on the pressing plate bearing groove by the lower bearing convex rib and the pressing plate bearing groove convex rib after being provided with the fourth sealing ring.

Example three:

referring to fig. 8 and 9, the present embodiment is different from the first embodiment in the structure for preventing the exchange of the liquid in the first impeller chamber and the second impeller chamber. The canned motor pump of this embodiment, in which the motor shaft end transmits the pump structure, further includes an annular fifth seal ring 830. The end surface of the end plate 160 "of the pump body is recessed to form a first bearing groove 161", and an upper bearing 361 "is installed on the first bearing groove 161" after being sleeved with a fifth sealing ring 830. The two ends of the motor shaft after the design respectively transmit the canned motor pump with a pump structure, which can avoid the mutual exchange when the first impeller cavity and the second impeller cavity are respectively provided with different temperatures or different liquids, and increase the application range of the centrifugal pump. Furthermore, the rotor assembly 300 'further includes a plastic part 350' injection-molded and fixed on the rotating shaft 310, a plurality of annular rotor ribs 351 'are protruded on an end surface of the plastic part 350' facing the end plate 160 ", a plurality of annular pump casing ribs 140 'are protruded on an end surface of the end plate 160" facing the plastic part 350 ", and the rotor ribs 351' and the pump casing ribs 140" are alternatively inserted to form a labyrinth structure. The design utilizes the clearance of maze to further restrict the exchange of liquid in first impeller chamber and second impeller chamber, promotes the sealed effect between first impeller chamber and the second impeller chamber.

Example four:

referring to fig. 20 to 22, the differences between the present embodiment and the first embodiment are the structure of the third seal ring and the connection structure of the third seal ring and the end plate or the pressure plate. The canned motor pump of this embodiment, in which the motor shaft end transmits the pump structure, further includes a clip member 170 for fixedly mounting the third sealing ring 860'. The clip 170 includes a hollow cylindrical clip body 173, a hook 171 disposed on an axial end face of the clip body 173, a clip boss 172 protruding inward in a radial direction of an inner ring of the clip body 173, and a clip rib 174 protruding from an axial end face of the clip body 173. The third seal ring 860 ' includes a hollow cylindrical third seal ring body 862 ', an outer seal ring 863 ' provided on an outer periphery of the third seal ring body 862 ', and a transition piece 864 ' connecting the two. The outer sealing ring 863 ' is axially provided with an outer sealing ring groove 865 ', the end plate 160 ' ″ of the pump body is provided with a clamping groove, and the third sealing ring 860 ' is clamped on the clamping member boss 172 and then the clamping member 170 is clamped on the clamping groove of the end plate 160 ' ″. Of course, as other equivalent implementation examples, a clamp groove is formed in the axial end face of the side, facing the stator cavity, of the clamp plate, and after the third seal ring penetrates through the rotating shaft, the clamp member is used for clamping the third seal ring in the clamp groove.

The present invention is not limited to the above-described embodiments. Various modifications and variations of the above-described embodiments are possible within the scope of the claims and equivalent technical scope of the present invention without departing from the spirit and scope of the present invention, and the present invention also includes such modifications and variations.

Claims

1. A canned motor pump of the type having a pump structure driven by each of two ends of a motor shaft, comprising: pump case (100, 100 ', 100 ", 100'"), rotor subassembly (300, 300 '), first pump cover (600), second pump cover (700) and stator module (30), rotor subassembly's pivot (310) both ends respectively are fixed with last impeller (330) and lower impeller (340), its characterized in that: the stator assembly structure is characterized by further comprising a pressing plate (200), the first pump cover (600) and the pump shell (100, 100 ' and 100 ') are in facing cover fit at one axial end to form a first impeller cavity (40) for accommodating the upper impeller (330), the pump shell (100, 100 ' and 100 ') is formed with a stator cavity (10) for accommodating the stator assembly and a tubular inner shell (110) with two open ends, the inner cavity of the inner shell (110) accommodates the rotor assembly (300 and 300 '), the pressing plate (200) is fixedly arranged at the other axial end of the pump shell and is sealed in a watertight manner in the stator cavity (10), and the second pump cover (700) and the pressing plate (200) are in facing cover fit to form a second impeller cavity (50) for accommodating the lower impeller (340).

2. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the specific structure that the pressure plate (200) is fixedly arranged at the other axial end of the pump shell and seals the stator cavity (10) in a watertight manner is as follows: an annular first sealing ring (810) is arranged between the shell (120) of the pump shell and the pressure plate (200); one side of the pressure plate (200) facing the stator cavity is provided with an annular pressure plate groove (210), the inner shell (110) is inserted into the pressure plate groove (210), and a second sealing ring (820, 820') is arranged between the inner shell (110) and the pressure plate (200).

3. The canned motor pump of claim 2, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the second sealing ring (820) is of a hollow cylindrical structure with an annular groove.

4. The canned motor pump of claim 2, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the axial single-side section of the second sealing ring (820 ') is L-shaped, and a plurality of annular second sealing ring convex ribs (821 ') are protruded on the cylindrical surface of the second sealing ring (820 ') tightly attached to the pressure plate groove (210).

5. The canned electric pump of claim 1 or 2, wherein the motor shaft end of each canned electric pump is a pump structure, and the canned electric pump further comprises: still include control panel (400) and side cap (500), the outer wall of shell (120) of pump case is toward outer arch and is surrounding edge (121) of column ring, side cap (500) set firmly on this surrounding edge (121) to enclose installation cavity (20) that forms the installation control panel with the surrounding edge, establish through-hole (122) with stator cavity (10) and installation cavity (20) intercommunication on the outer wall.

6. The canned motor pump of claim 5, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the motor stator further comprises a conducting rod (920), the conducting rod penetrates through the through hole (122), one end of the conducting rod is in contact with the iron core (31) on the stator assembly, and the other end of the conducting rod is communicated with the control board (400).

7. The canned motor pump of claim 6, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: still including setting up annular elastic block (840) between clamp plate (200) and iron core (31), protruding lug (921) towards the iron core is established to conducting rod (920), annular elastic block (840) sticiss conducting rod (920) and with lug (921) near the axial terminal surface of iron core (31).

8. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the sealing device also comprises an upper bearing (361) for penetrating and installing the rotating shaft, a lower bearing (362) and annular third sealing rings (860 and 860 '), wherein the inner rings of the third sealing rings (860 and 860 ') are radially raised by more than 2 annular third sealing ring convex ribs (861 and 861 ') tightly attached to the rotating shaft (310); the upper bearing (361) is fixed on an annular end plate (160, 160 ') of the pump shell in an injection molding manner, and the third sealing rings (861, 861') are positioned between the magnetic core (320) of the rotor assembly and the annular end plate (160, 160 ') and fixed on the annular end plate (160, 160'); or, the lower bearing is fixed on the pressing plate in an injection molding mode, and the third sealing ring is located between the magnetic core of the rotor assembly and the pressing plate and is fixed on the pressing plate.

9. The canned motor pump of claim 8, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: still including joint spare (170) that is used for fixed mounting third sealing washer (860 '), joint spare includes hollow column's joint spare body (173), establishes pothook (171) on this joint spare body (173) axial end face and radially inwards bellied joint spare boss (172) at the inner circle of this joint spare body (173), third sealing washer (860 ') joint in joint spare boss (172), joint spare (170) joint in end plate (160') or clamp plate (200).

10. The canned motor pump of claim 9, wherein the pump structure is a canned motor pump having a motor shaft with two ends each of which is configured to be driven by a motor shaft, and wherein: the third sealing ring (860 ') comprises a hollow cylindrical third sealing ring body (862'), an outer sealing ring (863 ') arranged on the periphery of the third sealing ring body (862') and a transition connecting piece (864 ') connecting the outer sealing ring and the third sealing ring, wherein an outer sealing ring groove (865') is axially arranged on the outer sealing ring (863 '), a clamping piece convex rib (174) is protruded on the axial end face of the clamping piece body (173), and the outer sealing ring groove (865') is sleeved on the clamping piece convex rib (174).

11. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the sealing device also comprises an upper bearing (361 ') for the penetration installation of the rotating shaft, a lower bearing (362') and a hollow cylindrical fourth sealing ring (850), wherein the inner ring of the fourth sealing ring is internally protruded by more than 2 annular fourth sealing ring convex ribs (851) tightly attached to the rotating shaft in the radial direction; the annular end plate (160 ') of the pump shell is provided with a downward concave bearing groove (166'), the radial direction of the bearing groove (166 ') is provided with a convex upper bearing groove convex rib (167') or an inward concave end plate groove, and the upper bearing sleeve (361 ') is provided with a fourth sealing ring (850) and is clamped on the bearing groove (166'); or, a concave pressing plate bearing groove is formed in the axial end face of the pressing plate, a convex rib of the pressing plate bearing groove or a concave pressing plate groove is formed in the radial direction of the pressing plate bearing groove, and the lower bearing sleeve is provided with a fourth sealing ring and is clamped on the pressing plate bearing groove.

12. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the rotor assembly (300) further comprises an upper bearing (361 ') for the rotating shaft to penetrate through and be mounted, a lower bearing (362 ') and an annular fifth sealing ring (830), a first bearing groove (161 ') is formed in the annular end plate (160 ') of the pump shell in a concave mode, the fifth sealing ring (830) is sleeved on the upper bearing (361 ') and is mounted on the first bearing groove (161 '), a plastic part (350 ') fixed on the rotating shaft (310) in an injection molding mode is further included, a plurality of annular rotor convex ribs (351 ') protrude from the end face, facing the annular end plate of the pump shell, of the plastic part, a plurality of annular pump shell convex ribs (140 ') protrude from the end face, facing the plastic part, of the rotor convex ribs (351 ') and the pump shell convex ribs (140 ') are inserted in a staggered mode to form a labyrinth sealing structure.

13. A canned electric pump of the type in which a pump structure is driven at each end of a motor shaft as defined in claim 8, 11 or 12, wherein: the upper bearing (361, 361 ') protrudes axially out of the annular end plate (160, 161 ') of the pump casing, and the lower bearing (362, 362 ') protrudes axially out of the axial end face of the pressure plate (200).

14. The canned motor pump of claim 13, wherein the pump structure is a canned motor pump having a motor shaft with two ends each comprising: the impeller structure further comprises impeller inserts (370) which are respectively injected on the upper impeller and the lower impeller, and the impeller inserts (370) axially protrude out of the outer end face of the shaft disc of the embedded impeller.

15. The canned motor pump of claim 14, wherein the pump structure is a canned motor pump having a motor shaft with two ends, and wherein: axial hole (311) and pivot boss (312) that supply impeller (330) and lower impeller (340) assembly are respectively established at the both ends of pivot (310), establish radial symmetry's flat position on this pivot boss (312), establish on impeller inserts (370) and supply pivot (310) to penetrate inserts hole (371) of taking flat position groove of assembly.

16. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the axial end face of the pressure plate (200) is provided with a pressure plate through hole (220), and the second impeller cavity (50) is communicated with a rotor cavity (70) which is enclosed by the pressure plate and the inner shell and contains the rotor assembly through the pressure plate through hole.

17. The canned motor pump of claim 1, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: the upper impeller and the lower impeller are equidirectional impellers.

18. The canned motor pump of claim 16, wherein the pump structure is a canned motor pump having a motor shaft with two ends, and wherein: the outer diameter of the upper impeller (330) is not equal to the outer diameter of the lower impeller (340).

19. The canned motor pump of claim 5, wherein the pump structure is a canned motor pump having a motor shaft with two ends each having a pump structure, and wherein: a side plate (510) with a mounting hole is protruded on the radial end surface of the side cover (500).