1. A canned motor pump, comprising:

a pump assembly (1) comprising a pump body (11);

the motor assembly comprises a machine shell assembly (21), a stator assembly (22), an outer rotor assembly (23) and a hollow shaft (24), wherein the stator assembly (22) and the outer rotor assembly (23) are arranged in the machine shell assembly (21), the pump body (11) is fixed at the first end of the machine shell assembly (21), the stator assembly (22) is sleeved on the outer side of the hollow shaft (24), the first end of the hollow shaft (24) extends into the pump body (11), the outer rotor assembly (23) is sleeved on the outer side of the stator assembly (22), the hollow shaft (24) is fixedly connected with the outer rotor assembly (23), the pump body (11) is communicated with the machine shell assembly (21), the machine shell assembly (21) is communicated with the hollow shaft (24), and liquid in the pump body (11) can flow into a space between the stator assembly (22) and the hollow shaft (24), and can flow from between the stator assembly (22) and the outer rotor assembly (23) to the outside of the outer rotor assembly (23), then to the second end of the hollow shaft (24), and back into the pump body (11) through the hollow shaft (24).

2. Canned motor pump according to claim 1, wherein the pump assembly (1) further comprises an impeller (12), the impeller (12) being fixed at a first end of the hollow shaft (24), the liquid being flowable through a gap between the impeller (12) and the housing assembly (21) into a space between the stator assembly (22) and the hollow shaft (24), the liquid being flowable through the hollow shaft (24) to a side of the impeller (12) remote from the housing assembly (21).

3. The canned pump of claim 2, wherein the housing assembly (21) comprises a connecting housing (211), a housing (212), and an end cap (213), the connecting housing (211) and the end cap (213) being fixed to a first end and a second end of the housing (212), respectively, a first end of the hollow shaft (24) being rotatably connected to the connecting housing (211) by a bearing, a second end of the hollow shaft (24) being rotatably connected to the end cap (213) by a bearing, and the pump body (11) being fixed to the connecting housing (211).

4. The canned motor pump according to claim 3, wherein the connection housing (211) is provided with a plurality of first communication holes (2111), the first communication holes (2111) communicate the pump body (11) with the housing assembly (21), and the liquid in the pump body (11) flows into the space between the stator assembly (22) and the hollow shaft (24) through the first communication holes (2111).

5. The canned motor pump according to claim 3, wherein the end cap (213) is provided inside with a connecting seat (2131), the second end of the hollow shaft (24) is rotatably connected to the connecting seat (2131), the connecting seat (2131) is provided with a second communication hole (2132), the second communication hole (2132) communicates the housing assembly (21) with the hollow shaft (24), and the liquid outside the outer rotor assembly (23) can flow into the hollow shaft (24) through the second communication hole (2132).

6. The canned pump of claim 3 wherein a canned sleeve assembly is provided in the housing (212), which comprises a first shielding sleeve (2121), a second shielding sleeve (2122), a first connecting piece (2123) and a second connecting piece (2124), the second shielding sleeve (2122) is sleeved outside the first shielding sleeve (2121), the second end of the second shielding sleeve (2122) and the second end of the first shielding sleeve (2121) are hermetically connected through a first connecting piece (2123), a first end of the first shielding sleeve (2121) is hermetically connected to the connection housing (211), the first end of the second shielding sleeve (2122) is hermetically connected with the base (212) through a second connecting piece (2124), the stator assembly (22) is disposed between the first and second shielding sleeves (2121, 2122), the outer rotor assembly (23) is arranged between the second shielding sleeve (2122) and the machine base (212).

7. The canned motor pump of claim 6, wherein the outer rotor assembly (23) comprises an outer rotor (231) and a plurality of magnetic steels (232), the outer rotor (231) comprises a rotor portion (2311) and a connecting portion (2312) which are connected with each other, the hollow shaft (24) is fixedly connected with the connecting portion (2312), the plurality of magnetic steels (232) are uniformly arranged on the inner wall of the rotor portion (2311) in a surrounding manner, and the magnetic steels (232) and a part of the rotor portion (2311) are located between the second shielding sleeve (2122) and the housing (212).

8. The canned pump according to claim 1, wherein the liquid inlet (111) of the pump body (11) is located on a side of the impeller (12) remote from the housing assembly (21) and is arranged coaxially with the impeller (12).

9. The canned motor pump according to claim 1, wherein the liquid outlet (112) of the pump body (11) is provided outside the outer peripheral surface of the impeller (12).

Background

The canned pump is a sealless pump, the pump and the drive motor are sealed in a pressure vessel filled with the pumped medium, the pressure vessel has only static seals, and a set of electric wires provides a rotating magnetic field and drives the rotor. The structure eliminates a rotating shaft sealing device of the traditional centrifugal pump, so that the leakage can be completely avoided.

However, in the operation process of the canned motor pump, the motor can generate a large amount of heat and needs to be radiated, the existing radiating mode adopts a mode of radiating outside the pump to radiate the heat, the efficiency of the radiating mode is low, and the normal use of the canned motor pump is influenced.

Therefore, a canned motor pump is needed to solve the above technical problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the canned motor pump, liquid flows in a motor assembly to effectively dissipate heat of a motor, the heat dissipation efficiency is high, and the canned motor pump can be ensured to normally operate.

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

there is provided a canned motor pump comprising:

a pump assembly comprising a pump body;

a motor assembly including a housing assembly, a stator assembly, an outer rotor assembly, and a hollow shaft, the stator assembly and the outer rotor assembly both disposed within the housing assembly, the pump body is fixed at the first end of the casing component, the stator component is sleeved outside the hollow shaft, the first end of the hollow shaft extends into the pump body, the outer rotor component is sleeved outside the stator component, the hollow shaft is fixedly connected with the outer rotor component, the pump body is communicated with the casing component, the casing assembly is communicated with the hollow shaft, liquid in the pump body can flow into a space between the stator assembly and the hollow shaft, and can flow from between the stator assembly and the outer rotor assembly to the outside of the outer rotor assembly, then to the second end of the hollow shaft, and back into the pump body through the hollow shaft.

As a preferable technical solution of the canned motor pump, the pump assembly further includes an impeller fixed at the first end of the hollow shaft, the liquid can flow into a space between the stator assembly and the hollow shaft through a gap between the impeller and the casing assembly, and the liquid can flow to a side of the impeller away from the casing assembly through the hollow shaft.

As a preferred technical scheme of canned pump, the casing subassembly is including connecting casing, frame and end cover, connect the casing with the end cover is fixed respectively the first end and the second end of frame, the first end of hollow shaft with it passes through the bearing and rotates the connection to connect the casing, the second end of hollow shaft with the end cover passes through the bearing and rotates the connection, the pump body is fixed connect on the casing.

As a preferred technical scheme of the canned motor pump, a plurality of first through holes are arranged on the connecting shell, the first through holes are communicated with the pump body and the casing assembly, and liquid in the pump body flows into a space between the stator assembly and the hollow shaft through the first through holes.

As a preferred technical scheme of the canned motor pump, a connecting seat is arranged in the end cover, a second end of the hollow shaft is rotatably connected with the connecting seat, a second communicating hole is formed in the connecting seat and is communicated with the casing assembly and the hollow shaft, and liquid on the outer side of the outer rotor assembly can flow into the hollow shaft through the second communicating hole.

As an optimal technical scheme of a canned pump, be provided with the shielded cell subassembly in the frame, it includes first shielded cell, second shielded cell, first connection piece and second connection piece, the second shielded cell cover is located the outside of first shielded cell, the second shielded cell with the second end of first shielded cell is through first connection piece sealing connection, the first end sealing connection of first shielded cell in connect the casing, the first end of second shielded cell pass through the second connection piece with frame sealing connection, stator module sets up first shielded cell with between the second shielded cell, the outer rotor subassembly sets up the second shielded cell with between the frame.

As a preferred technical scheme of the canned motor pump, the outer rotor assembly comprises an outer rotor and a plurality of magnetic steels, the outer rotor comprises a rotor part and a connecting part which are connected with each other, the hollow shaft is fixedly connected with the connecting part, the plurality of magnetic steels are uniformly and annularly arranged on the inner wall of the rotor part, and the magnetic steels and part of the rotor part are positioned between the second canned sleeve and the motor base.

As a preferred technical scheme of canned motor pump, the inlet of pump body is located the impeller is kept away from one side of casing subassembly, and with the impeller coaxial setting.

As a preferred technical scheme of the canned motor pump, the liquid outlet of the pump body is arranged on the outer side of the peripheral surface of the impeller.

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

the liquid in the pump body can flow into the space between the stator assembly and the hollow shaft, and can flow to the outer side of the outer rotor assembly from the space between the stator assembly and the outer rotor assembly, then flow to the second end of the hollow shaft, and flow back into the pump body through the hollow shaft. The outer rotor assembly and the hollow shaft are soaked in liquid, a large amount of heat can be generated in the operation process of the motor assembly, the liquid can take away the heat generated by the outer rotor assembly and the hollow shaft in the flowing process, the heat generated by the stator assembly can also be taken away due to the heat transfer effect, the liquid flows in the motor assembly to effectively dissipate heat of the motor, the heat dissipation efficiency is high, and the normal operation of the shielding pump can be guaranteed.

Drawings

FIG. 1 is a cross-sectional view of a canned motor pump provided by the present invention;

FIG. 2 is a schematic structural view of a connection housing according to the present invention;

fig. 3 is a schematic structural diagram of the end cap provided by the present invention.

Wherein, 1, a pump assembly; 11. a pump body; 111. a liquid inlet; 112. a liquid outlet; 12. an impeller;

21. a housing assembly; 211. connecting the shell; 2111. a first communication hole; 212. a machine base; 2121. a first shielding sleeve; 2122. a second shielding sleeve; 2123. a first connecting piece; 2124. a second connecting sheet; 213. an end cap; 2131. a connecting seat; 2132. a second communication hole;

22. a stator assembly; 23. an outer rotor assembly; 231. an outer rotor; 2311. a rotor portion; 2312. a connecting portion; 232. magnetic steel;

24. a hollow shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

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

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

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1-3, the present embodiment discloses a canned motor pump comprising a pump assembly 1 and a motor assembly.

The pump assembly 1 comprises a pump body 11 and an impeller 12, a motor assembly comprising a housing assembly 21, a stator assembly 22, an outer rotor assembly 23 and a hollow shaft 24. Pump body 11 is fixed to a first end of housing assembly 21, and specifically, pump body 11 is provided with an opening on a side close to housing assembly 21, so that the opening of pump body 11 is blocked by a portion of housing assembly 21. The impeller 12 is disposed in the pump body 11, the pump body 11 is provided with a liquid inlet 111 and a liquid outlet 112, and the liquid inlet 111 of the pump body 11 is located on one side of the impeller 12 away from the housing assembly 21 and is disposed coaxially with the impeller 12. The liquid outlet 112 of the pump body 11 is provided outside the outer peripheral surface of the impeller 12. The pressure at the axis of the impeller 12 is small in the rotation process of the impeller 12, the pressure at the edge of the impeller 12 is large, and the impeller 12 can convey the liquid at the axis of the impeller 12 to the edge of the impeller 12 under the action of centrifugal force. Therefore, the liquid inlet 111 is disposed on a side of the impeller 12 away from the housing assembly 21 and is disposed coaxially with the impeller 12, and the liquid outlet 112 is disposed outside an outer circumferential surface of the impeller 12.

The housing assembly 21 includes a connection housing 211, a base 212, and an end cover 213, and the connection housing 211 and the end cover 213 are fixed to a first end and a second end of the base 212, respectively. Stator assembly 22 and outer rotor assembly 23 all set up in chassis subassembly 21, and stator assembly 22 overlaps the outside of locating hollow shaft 24, and the first end of hollow shaft 24 stretches into in pump body 11, specifically, the first end of hollow shaft 24 passes through the bearing with connect casing 211 and is connected in rotation, and the second end of hollow shaft 24 passes through the bearing with end cover 213 and is connected in rotation, and pump body 11 is fixed on connecting casing 211. The end cap 213 is provided with a connecting seat 2131 inside, and the second end of the hollow shaft 24 is rotatably connected with the connecting seat 2131.

The outer rotor assembly 23 is sleeved on the outer side of the stator assembly 22, the hollow shaft 24 is fixedly connected with the outer rotor assembly 23, specifically, the outer rotor assembly 23 comprises an outer rotor 231 and a plurality of magnetic steels 232, the outer rotor 231 comprises a rotor portion 2311 and a connecting portion 2312 which are connected with each other, the hollow shaft 24 is fixedly connected with the connecting portion 2312, the plurality of magnetic steels 232 are uniformly and annularly arranged on the inner wall of the rotor portion 2311, and the magnetic steels 232 are arranged at intervals.

A shielding sleeve assembly is disposed in the housing 212 and includes a first shielding sleeve 2121, a second shielding sleeve 2122, a first connecting piece 2123 and a second connecting piece 2124, the second shielding sleeve 2122 is sleeved outside the first shielding sleeve 2121, a second end of the second shielding sleeve 2122 and a second end of the first shielding sleeve 2121 are hermetically connected by the first connecting piece 2123, and a first end of the first shielding sleeve 2121 is hermetically connected to the connecting housing 211. The first end of the second shield 2122 is hermetically connected to the housing 212 through the second connecting piece 2124, the stator assembly 22 is disposed between the first shield 2121 and the second shield 2122, the outer rotor assembly 23 is disposed between the second shield 2122 and the housing 212, specifically, the magnetic steel 232 and a part of the rotor portion 2311 are disposed between the second shield 2122 and the housing 212, and the connecting portion 2312 is disposed at a distance from the first connecting piece 2123, and the second shield 2122 is disposed at a distance from the outer rotor 231.

The liquid in the pump body 11 can flow into the space between the stator assembly 22 and the hollow shaft 24, and can flow from between the stator assembly 22 and the outer rotor assembly 23 to the outside of the outer rotor assembly 23, and then flow to the second end of the hollow shaft 24, and flow back into the pump body 11 through the hollow shaft 24.

Specifically, a plurality of first communication holes 2111 are provided in the connection housing 211, and the first communication holes 2111 communicate the pump body 11 with the casing assembly 21, specifically, communicate liquid that can pass through the gap between the impeller 12 and the casing assembly 21 and the space between the stator assembly 22 and the hollow shaft 24. The liquid in the pump body 11 flows into the space between the stator assembly 22 and the hollow shaft 24 through the first communication hole 2111. The connecting seat 2131 is provided with a second communicating hole 2132, the second communicating hole 2132 communicates the casing assembly 21 with the hollow shaft 24, specifically, communicates the hollow shaft with the space outside the outer rotor assembly 23 of the casing assembly 21, and the liquid outside the outer rotor assembly 23 can flow into the hollow shaft 24 through the second communicating hole 2132. Specifically, the connecting seat 2131 is split, a connecting sleeve is embedded in the connecting seat 2131, the connecting sleeve and the side wall of the end cover 213 are arranged at intervals, and a gap between the split parts of the connecting seat 2131 and the connecting sleeve form a second communicating hole 2132 together, so that liquid outside the connecting seat 2131 can flow into the connecting seat 2131.

Liquid can flow through the gap between the impeller 12 and the casing assembly 21 into the space between the stator assembly 22 and the hollow shaft 24, and liquid can flow through the hollow shaft 24 to the side of the impeller 12 remote from the casing assembly 21. Then flows to the gap between the connection portion 2312 and the first connection piece 2123 to the gap between the rotor portion 2311 and the first connection piece 2123; and then to the gap between the rotor portion 2311 and the second shield sleeve 2122; then flows to the outside of the rotor portion 2311 from the gap between the magnetic steels 232; then flows to the gap between the connecting portion 2312 and the end cap 213, flows to the second end of the hollow shaft 24 through the second communication hole 2132, and finally flows back into the pump body 11 through the hollow shaft 24, specifically flows to the liquid inlet 111 of the pump body 11. The liquid may be driven to flow in the above path due to the lower pressure of the loading port 111. The specific flow paths are shown by the arrows in fig. 1. The first end of the first shield 2121 is sealingly coupled to the coupling housing 211 such that fluid does not contact the stator assembly 22.

Liquid flows in motor components like this, can make the shield assembly, outer rotor assembly 23, hollow shaft 24 and bearing all soaked in liquid, because stator module 22 sets up between first shield 2121 and second shield 2122, the heat transfer that stator module 22 produced gives the shield assembly, can produce a large amount of heats in the motor components operation process, liquid can take away outer rotor assembly 23 at the flow in-process, stator module 22, the heat that hollow shaft 24 and bearing produced, can carry out effectual heat dissipation to the motor, and the radiating efficiency is high, can guarantee canned motor normal operating. Moreover, the bearing is soaked in the liquid, and the liquid can lubricate the bearing.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.