CN219035129U - Pump body and canned motor pump with same - Google Patents

Abstract

The utility model provides a pump body and have shielding charge pump of this pump body, this pump body includes once plastic envelope stator, pivot and plastic envelope pump part, and once plastic envelope stator includes stator module and the columnar stator plastic envelope shell of moulding plastics on it, and through-hole and locating hole are established to this stator plastic envelope shell's axial; the plastic package pump part is fixed in one-time plastic package stator and pivot, including tubular inner shell part, shell part and the connecting portion of connecting the two, the protruding bellying fixed pivot that forms in tubular bottom center of inner shell part, this bellying is equipped with the first counter bore that is passed through by the pivot in the open-ended one side of tubular chamber dorsad, the bellying is exposed outward at the both ends of pivot. The pump body and the canned motor pump adopt the through holes, the positioning holes and the two ends of the rotating shaft of the stator plastic package shell to simultaneously provide positioning for the die when the pump part is injection molded, and the qualification rate of production is high; meanwhile, the pump body can prevent the operation efficiency and stability of the electric pump from being reduced due to the fact that the rotating shaft and the plastic package stator are not concentric.

Description

Pump body and canned motor pump with same

Technical Field

The utility model relates to a pump body, in particular to a canned motor pump applying the pump body, and the IPC classification number of the canned motor pump is F04D1/00.

Background

As the application range of the canned motor pump is wider, the requirement on the working stability of the canned motor pump is higher. In order to improve the working stability of the canned motor pump, the prior art method is to perform injection molding on a stator assembly to form a plastic-sealed stator with a stator plastic-sealed shell, and then to put the plastic-sealed stator into a mold as an insert for injection molding to form a pump body with a cylinder for accommodating a rotor. To improve the magnetic properties of the canned motor pump to which the pump body is applied, the pump body is generally designed with a small wall thickness. When the wall thickness of the pump body is thin (for example, the wall thickness is less than or equal to 1 mm), the defects of glue shortage, weld marks and the like easily occur when the pump body is produced by adopting the scheme, so that the qualification rate of the injection-molded pump body is low, and a better solution is not available at present.

Disclosure of Invention

In order to solve the problems, the utility model provides the following technical scheme:

the utility model provides a pump body, includes once plastic envelope stator, pivot and plastic envelope pump part, its characterized in that: the primary plastic package stator comprises a stator assembly with an iron core and a columnar stator plastic package shell which is injection molded on the stator assembly, wherein a through hole and a positioning hole are axially formed in the stator plastic package shell; the plastic package pump part is fixed in one time plastic package stator and pivot, including the inner shell part of tube-shape, be located the radial outside hollow columnar shell part of inner shell part and with the connecting portion of both connection, in the stator chamber that the inner shell part outer shell part and connecting portion enclose, the protruding fixed pivot of bellying that forms in tube-shape bottom center of inner shell part, this bellying is equipped with the first counter bore that is passed through by the pivot in the open-ended one side of tube-shape chamber dorsad, the bellying is exposed outward at the both ends of pivot.

According to the pump body, when the pump part is injection molded, the through hole, the positioning hole and the two ends of the rotating shaft of the stator plastic package are used for simultaneously providing positioning for the mold, so that the defect of glue shortage caused by offset of the once plastic package stator in the mold cavity due to high-temperature and high-pressure plastic impact in the injection molding process of the pump body can be prevented, and the qualification rate of pump body production is improved; and the electric pump can be prevented from being lowered in operation efficiency and stability due to the fact that the rotating shaft is not concentric with the plastic package stator.

Further, the radial thickness L1 from the inner wall surface of the inner housing part to the pole surface of the core is 0.5 to 1mm.

Further, the positioning hole comprises a plurality of counter bores positioned on the axial surface close to one side of the connecting part, and a plurality of second counter bores are arranged on the axial end surface of the connecting part and concentrically correspond to the counter bores one by one.

Still further, the positioning hole further includes a plurality of molding holes located on an axial face of a side remote from the connecting portion.

Further, the centers of the plurality of plastic package holes are positioned on the same first virtual circle, the centers of the plurality of counter bores are positioned on the same second virtual circle, and the centers of the through holes are coincident with the center of the first virtual circle and the center of the second virtual circle in the axial projection diagram.

Further, the number of the plastic package holes is 2, and the number of the counter bores and the number of the second counter bores are 3.

Further, the second counter bore is a notched stepped bore.

Still further, a plug secured to the first counterbore in a cylindrical shape is included.

Further, the axial end face and the pole face of the pole shoe of the iron core are exposed out of the through hole.

Further, the stator assembly further comprises a wiring board for electrically connecting the coils formed by winding the enameled wires, and the wiring board is wrapped in the stator plastic package.

Still further, the stator assembly further comprises an inserting sheet electrically connected with the wiring board and a terminal sheath sleeved on the inserting sheet, and the part of the inserting sheet, which is connected with an external power supply, and the end face of the terminal sheath, which is separated from the wiring board, are exposed out of the stator plastic package.

Further, a plurality of first grooves which are uniformly distributed circumferentially are arranged on the end face, provided with the counter bore, of the stator plastic package shell around the outer side of the through hole, and the first grooves face one end of the through hole and are open.

Furthermore, the plurality of first grooves are radially and circumferentially distributed.

Furthermore, the plastic package pump part is provided with a plurality of second grooves which are circumferentially and uniformly distributed around the outer side of the cylindrical inner shell part at the end face of the connecting part, and the axial projection of the second grooves is positioned in the axial projection range of the first grooves.

Further, the stator assembly further comprises a coil rack for winding the enameled wires, the coil rack is provided with a plurality of coil rack concave parts which are concave in the radial direction, and the counter bore is correspondingly positioned on the radial outer side of the coil rack concave parts.

Further, the pump body also includes a plug disposed on the second counterbore.

Further, the cylindrical bottom outer side of the inner housing part is axially recessed to form a plurality of heat radiation holes for heat radiation.

The utility model provides a canned motor pump, includes the rotor subassembly that is equipped with the impeller, has the pump cover of water inlet and delivery port and the arbitrary pump body of above-mentioned, and the pump cover lid is located the axial one side of pump body and is enclosed into the impeller chamber with it, impeller holding in the impeller intracavity, its characterized in that: the inner housing portion defines a rotor cavity upon which the rotor assembly is mounted.

The utility model provides a shielding electric pump, which can reduce the wall thickness of an inner shell part of a pump body through an optimal design, is beneficial to reducing the gap between an iron core and a rotor assembly and improves the magnetic performance of the shielding electric pump.

Further, the canned motor pump also comprises a rear cover and a circuit board for controlling the operation of the canned motor pump, wherein the rear cover is arranged on the other axial side of the pump body, and the circuit board is arranged in a space surrounded by the rear cover and the pump body. The structure integrates the circuit board in the canned motor pump, protects the circuit board, has high integration level of the whole pump, and further improves the application scene of the canned motor pump.

Drawings

FIG. 1 is a schematic perspective view of a pump body of the present utility model;

FIG. 2 is a cross-sectional view of the pump body of the present utility model;

FIG. 3 is a cross-sectional view of a plastic encapsulated stator of the present utility model;

FIG. 4 is a schematic perspective view of a stator assembly of the present utility model;

FIG. 5 is a schematic perspective view of a plastic-encapsulated stator according to the present utility model;

fig. 6 is a schematic view of another directional perspective structure of the plastic-sealed stator of the present utility model;

FIG. 7 is a schematic view of another directional perspective of the pump body of the present utility model;

FIG. 8 is a cross-sectional view of a canned motor pump according to the present utility model;

wherein:

1-stator cavity, 2-impeller cavity, 10-pump body, 11-pole face, 12-pole shoe, 13-coil former recess, 20-impeller, 100-one-shot molded stator, 110-stator assembly, 111-core, 112-coil former, 113-enameled wire, 114-wiring board, 115-insert, 116-terminal sheath, 120-stator molded case, 121-molded case hole, 122-counterbore, 123-first groove, 130-through hole, 200-molded pump part, 210-inner case part, 211-first counterbore, 212-heat dissipating hole, 213-boss, 220-outer case part, 230-connecting part, 231-second counterbore, 232-second groove, 300-rotor assembly, 310-spindle, 400-pump cover, 500-back cover, 600-plug, 700-circuit board, 800-plug

Detailed Description

The utility model discloses a pump body, see fig. 1 and 2, which comprises a primary plastic package stator 100, a rotating shaft 310 and a plastic package pump part 200, wherein the plastic package pump part 200 is formed by taking the primary plastic package stator 100 and the rotating shaft 310 as inserts and placing the inserts into a mold for injection molding, and is fixed on the primary plastic package stator 100 and the rotating shaft 310.

Referring to fig. 3 to 5, the once plastic-sealed stator 100 includes a stator assembly 110 and a cylindrical stator plastic-sealed case 120 having a through hole 130 at the center thereof by injection molding using the stator assembly 110 as an insert, and the stator assembly 110 includes an iron core 111, a bobbin 112 fixed to the iron core 111, and an enamel wire 113 wound around the bobbin 112. After the stator assembly 110 is injection molded, the stator plastic envelope 120 fixed thereon wraps the enamel wire 113 of the stator assembly. Referring to fig. 5 and 6, the stator plastic package 120 produced after injection molding is axially formed with positioning holes for use in injection molding the pump part 200 with a mold.

Referring to fig. 1 or 2, the plastic sealed pump section 200 includes a cylindrical inner housing part 210, a hollow cylindrical outer housing part 220 located radially outside the inner housing part 210, and a connection part 230 connecting the inner housing part 210 and the outer housing part 220. The inner case portion 210, the outer case portion 220 and the connection portion 230 are enclosed to form a stator cavity 1, and the once plastic-sealed stator 100 is accommodated in the stator cavity 1. Referring to fig. 2 and 7, a boss 213 is formed to protrude from the center of the cylindrical bottom of the inner housing part 210 to fix a rotation shaft 310, a first counter bore 211 is formed at a side of the boss 213 facing away from the opening of the cylindrical cavity, the rotation shaft 310 passes through the first counter bore 211, and both ends of the rotation shaft extend out of the boss 213.

According to the pump body, when the pump body is injection-molded, the through hole, the positioning hole and the two ends of the rotating shaft of the stator plastic package are used for simultaneously providing positioning for the mold, so that the defect of glue shortage caused by offset of the once plastic package stator in the mold cavity due to high-temperature and high-pressure plastic impact in the injection molding process of the pump body can be prevented, the qualification rate of pump body production is improved, and particularly the production qualification rate of the pump body with thinner wall thickness is improved; and the electric pump can be prevented from being lowered in operation efficiency and stability due to the fact that the rotating shaft is not concentric with the plastic package stator.

To reduce the magnetic gap of the product using the pump body and improve the magnetic performance of the product using the pump body, as shown in fig. 2, the radial thickness L1 from the inner wall surface of the inner housing portion 210 of the plastic-sealed pump portion 200 to the pole face 11 of the iron core 111 is 0.5-1 mm.

Referring to fig. 1 and 6, the positioning hole includes a plurality of counter bores 122 located on an axial surface near one side of the connection portion 230, and a plurality of second counter bores 231 are provided on an axial end surface of the connection portion 230, and the second counter bores 231 are concentrically and one-to-one corresponding to the counter bores 122. The design can facilitate the manufacture of a mould for producing the once plastic package stator and the pump body, and is convenient for production. Still further, the positioning hole further includes a plurality of molding holes 121 located on an axial surface of a side remote from the connection portion 230. The design provides positioning for the two axial sides of the die at the same time, and the qualification rate of the pump body is further improved.

Referring to fig. 1 and 5, the centers of the plurality of plastic package holes 121 are located on the same first virtual circle C1, the centers of the plurality of counter bores 122 are located on the same second virtual circle C2, and the center of the through hole 130 coincides with the center of the first virtual circle C1 and the center of the second virtual circle C2 in the axial projection view. Through the design, the cylindrical inner shell part of the accommodating rotor of the plastic package pump part is coaxial with the plastic package stator, so that the air gap of the motor is uniform, and better electromagnetic performance of the motor is obtained.

In order to more firmly accommodate the once plastic-sealed stator in the mold cavity for producing the plastic-sealed pump section, the number of plastic-sealed casing holes 121 is 2, and the number of counter bores 122 and second counter bores 231 is 3, as shown in fig. 1 and 5.

Referring to fig. 6, in the one-time plastic package stator 100 of the present utility model, the second counterbore 231 on the stator plastic package casing 120 is a stepped hole with a notch. In a preferred embodiment, the second counterbore 231 is a notched semi-circular stepped bore. The radial dimension of the once plastic package stator can be reduced through the design, materials for producing the stator plastic package shell are reduced, and production cost is reduced.

Referring to fig. 7, the outer side of the cylindrical bottom of the plastic pump 200 according to the present utility model is axially recessed with a plurality of heat dissipating holes 212 for heat dissipation. The design can be beneficial to increasing the contact area between the liquid in the rotor cavity and the outside, and is beneficial to the pump body to rapidly dissipate heat of external parts.

Referring to fig. 2, the pump body of the present utility model further includes a cylindrical plug 800 secured to the first counterbore 211. The design can further prevent the liquid in the rotor cavity formed by the inner shell part from leaking outwards, and further improves the safety of the pump body product. Further, the plug 800 is ultrasonically welded to the first counterbore 211. Of course, as other embodiments, the plug 800 may be snapped onto the first counterbore 211.

Referring to fig. 3 or 6, the axial end face of the pole shoe 12 and the pole face 11 of the iron core 111 of the primary plastic-sealed stator 100 of the present utility model are exposed to the stator plastic-sealed case 120. Through the design, the positioning of the mould for producing the stator plastic package is facilitated, and the structure of the mould for producing the stator plastic package is simplified.

Referring to fig. 3 or 4, the enameled wire 113 of the stator assembly 110 of the present utility model is wound to form a coil, and the stator assembly 110 further includes a terminal plate 114 electrically connected to the coil, wherein the terminal plate 114 is also wrapped in the stator plastic package 120. The design is convenient for connect the coil of homophase, and the enameled wire is broken when avoiding moulding plastics stator plastic envelope, promotes the production qualification rate of once plastic envelope stator. Further, referring to fig. 4 and 5, the stator assembly 110 further includes a tab 115 electrically connected to the terminal plate 114 and a terminal sheath 116 sleeved on the tab, and a portion of the tab 115 for external power connection and an end surface of the terminal sheath 116 away from the terminal plate 114 are exposed to the stator plastic package 120. When this structure reduces stator module and puts into the mould and moulds plastics, the mould collides with the spliced pole and leads to the damage that stator module takes place and reduces the molten plastics and overflow along the spliced pole when moulding plastics, further promotes the production qualification rate of taking the stator of circuit board and plastic envelope.

Referring to fig. 6, the stator plastic package 120 of the present utility model is provided with a plurality of first grooves 123 circumferentially and uniformly distributed around the outside of the through hole 130 on the end surface provided with the counter bore 122, and the first grooves 123 are opened toward one end of the through hole 130. This design prevents to mould plastics and takes place circumference removal at the plastic envelope pump part on once plastic envelope stator, promotes the stability that both connect. Further, the plurality of first grooves 123 are uniformly distributed in the radial direction, specifically, the number of the first grooves 123 is the same as the number of the coils, more specifically, the number of the first grooves 123 in the present utility model is 9. Further, in order to avoid shrinkage of the plastic package pump part, as shown in fig. 1, the plastic package pump part 200 is provided with a plurality of second grooves 232 circumferentially and uniformly distributed around the outer side of the cylindrical inner shell part 210 at the end surface of the connecting part 230, and the axial projection of the second grooves 232 is located in the axial projection range of the first grooves 123.

Referring to fig. 4 and 6, the coil bobbin 112 of the stator assembly 110 is provided with a plurality of radially inwardly recessed coil bobbin recesses 13, and the counterbore 122 is correspondingly located radially outwardly of the coil bobbin recesses 13. The design can radially inwards move the positioning needle of the mould of the injection molding plastic package pump part, and is beneficial to reducing the volume of the plastic package pump shell.

Referring to fig. 2, the pump body of the present utility model further includes a stopper 600 disposed on the second counterbore 231. The structure can prevent the external liquid from entering the stator cavity from the second counter bore to cause damage, and improves the working stability of the product applying the pump body. Further, the plug 600 is ultrasonically welded to the second counterbore 231.

The utility model also discloses a canned motor pump applying the pump body, and the canned motor pump has better production efficiency by optimizing the structure of the rotor assembly.

Referring to fig. 8, the canned motor pump of the present utility model includes a rotor assembly 300 provided with an impeller 20, a pump cover 400 having a water inlet and a water outlet, and the pump body 10 described above. The pump cover 400 is disposed on one axial side of the pump body 10 and encloses the impeller cavity 2 with the pump cover, the impeller 20 is accommodated in the impeller cavity 2, the inner housing part 210 encloses the rotor cavity 3, and the rotor assembly 300 is mounted on the rotor cavity 3. The utility model provides a shielding electric pump, which can reduce the wall thickness of an inner shell part of a pump body through an optimal design, is beneficial to reducing the gap between an iron core and a rotor assembly and improves the magnetic performance of the shielding electric pump.

Referring to fig. 8, the canned motor pump of the present utility model further includes a rear cover 500 and a circuit board 700. The circuit board 700 is accommodated in a space surrounded by the rear cover 500 and the pump body 10, and is electrically connected with the enameled wire 113. The structure integrates the circuit board in the canned motor pump, protects the circuit board, has high integration level of the whole pump, and further improves the application scene of the canned motor pump.

The present utility model is not limited to the above-described embodiments, but, if various modifications or variations of the present utility model are not departing from the spirit and scope of the present utility model, the present utility model is intended to include such modifications and variations as fall within the scope of the claims and the equivalents thereof.

Claims (19)

1. The utility model provides a pump body, includes plastic envelope stator (100), pivot (310) and plastic envelope pump part (200), its characterized in that:

-the primary plastic package stator (100) comprises a stator assembly (110) with an iron core (111) and a columnar stator plastic package shell (120) injection-molded on the stator assembly, wherein a through hole (130) and a positioning hole are axially formed in the stator plastic package shell (120);

-plastic envelope pump part (200) are fixed in on plastic envelope stator (100) and pivot (310) once, including tube-shape inner shell part (210), be located the radial outside hollow columnar shell part (220) of inner shell part and with connecting portion (230) that connect both, in stator chamber (1) that inner shell part (210) outer shell part (220) and connecting portion (230) enclose once plastic envelope stator (100), the protruding bellying (213) fixed rotating shaft (310) that forms in tube-shape bottom center of inner shell part (210), this bellying (213) are equipped with by first counter bore (211) that pivot (310) passed through in the one side of tube-shape chamber opening dorsad, bellying (213) are exposed outward at the both ends of pivot (310).

2. The pump body of claim 1, wherein: the radial thickness L1 from the inner wall surface of the inner shell part (210) to the pole surface (11) of the iron core (111) is 0.5-1 mm.

3. The pump body of claim 1, wherein: the positioning hole comprises a plurality of counter bores (122) positioned on an axial surface close to one side of the connecting part (230), a plurality of second counter bores (231) are arranged on the axial end surface of the connecting part (230), and the second counter bores (231) and the counter bores (122) are concentrically in one-to-one correspondence.

4. A pump body according to claim 3, characterized in that: the positioning holes further comprise a plurality of plastic package holes (121) positioned on the axial surface of the side far away from the connecting part (230).

5. The pump body of claim 4, wherein: the centers of the plastic package holes (121) are located on the same first virtual circle (C1), the centers of the counter bores (122) are located on the same second virtual circle (C2), and the centers of the through holes (130) are coincident with the circle center of the first virtual circle (C1) and the circle center of the second virtual circle (C2) in the axial projection view.

6. The pump body of claim 4, wherein: the number of the plastic package holes (121) is 2, and the number of the counter bores (122) and the number of the second counter bores (231) are 3.

7. A pump body according to claim 3, characterized in that: the second counter bore (231) is a stepped bore with a notch.

8. The pump body of claim 1, wherein: the device also comprises a columnar plug (800) fixed on the first counter bore (211).

9. The pump body of claim 1, wherein: the axial end face and the pole face (11) of the pole shoe (12) of the iron core (111) are exposed out of the through hole (130).

10. The pump body of claim 1, wherein: the stator assembly (110) further comprises a wiring board (114) for electrically connecting coils formed by winding the enameled wires (113), and the wiring board (114) is wrapped in the stator plastic package (120).

11. The pump body of claim 10, wherein: the stator assembly (110) further comprises an inserting sheet (115) electrically connected with the wiring board (114) and a terminal sheath (116) sleeved on the inserting sheet, and a part, connected with an external power supply, of the inserting sheet (115) and the terminal sheath (116) are exposed out of the end face of the wiring board (114) and are exposed out of the stator plastic package (120).

12. A pump body according to claim 3, characterized in that: a plurality of first grooves (123) which are uniformly distributed circumferentially are formed on the end face, provided with the counter bore (122), of the stator plastic package shell (120) and surround the outer side of the through hole (130), and the first grooves (123) face one end opening of the through hole (130).

13. The pump body of claim 12, wherein: the plurality of first grooves (123) are radially and circumferentially uniformly distributed.

14. The pump body of claim 13, wherein: the plastic package pump part (200) is provided with a plurality of second grooves (232) which are circumferentially and uniformly distributed around the outer side of the cylindrical inner shell part (210) at the end face of the connecting part (230), and the axial projection of the second grooves (232) is positioned in the axial projection range of the first grooves (123).

15. A pump body according to claim 3, characterized in that: the stator assembly (110) further comprises a coil former (112) for winding the enameled wires (113) of the stator assembly, the coil former (112) is provided with a plurality of coil former concave parts (13) which are radially inwards concave, and the counter bore (122) is correspondingly positioned on the radial outer side of the coil former concave parts (13).

16. A pump body according to claim 3, characterized in that: also included is a plug (600) disposed on the second counterbore (231).

17. The pump body of claim 1, wherein: the cylindrical bottom outer side shaft of the inner shell part (210) is recessed downward to form a plurality of heat dissipation holes (212) for heat dissipation.

18. A canned motor pump, including rotor subassembly (300) that is equipped with impeller (20), have pump cover (400) and the pump body of any one of claims 1 to 17 of water inlet and delivery port, pump cover (400) lid locates the axial one side of the pump body and encloses impeller chamber (2) with it, impeller (20) holding is in impeller chamber (2), its characterized in that: the inner housing part (210) encloses a rotor chamber (3), and the rotor assembly (300) is mounted on the rotor chamber (3).

19. The canned motor pump according to claim 18, wherein: the novel electric pump further comprises a rear cover (500) and a circuit board (700) for controlling the operation of the canned motor pump, wherein the rear cover (500) is arranged on the other axial side of the pump body in a covering mode, and the circuit board (700) is arranged in a space surrounded by the rear cover (500) and the pump body.

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