CN114183378A

CN114183378A - High-power high-speed submersible pump

Info

Publication number: CN114183378A
Application number: CN202111354925.2A
Authority: CN
Inventors: 张睿杰; 汪家琼; 孔繁余
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-03-15

Abstract

The invention provides a high-power high-speed submersible pump, which comprises a motor shell and a middle section shell, wherein a gap between the motor shell and the middle section shell is a middle section cavity, and the middle section cavity is communicated with a pump cover cavity; one end of a shaft of the motor is supported in an upper bearing seat, a bearing cavity is arranged in the upper bearing seat, the lower end of the bearing cavity is connected with a motor outer shell, the upper end of the bearing cavity is connected with an upper pump cover inner shell, the upper bearing seat and the upper pump cover inner shell form a sealed upper bearing seat dry cavity, and a power-on element used for being connected with the motor in the motor outer shell is installed in the upper bearing seat dry cavity; an upper bearing seat wet cavity communicated with the pump cover cavity is arranged around the outside of the bearing cavity, and the upper bearing seat wet cavity is not communicated with the upper bearing seat dry cavity. According to the invention, medium water is introduced into the wet cavity outside the upper bearing seat to cool and radiate the upper bearing seat, and the three wiring terminals of the motor are placed in the dry cavity, so that the motor is insulated and safe.

Description

High-power high-speed submersible pump

Technical Field

The invention relates to the field of submersible pumps, in particular to a high-power high-speed submersible pump.

Background

The submersible pump can reduce the volume and improve the efficiency by improving the rotating speed. In the submersible pump on the market at present, the rotating speed of a low-power pump is increased to 3000r/min or higher, while the rotating speed of a high-power pump is not higher than 1500r/min, otherwise, the upper bearing is damaged and fails. The reason for this is that the upper bearing seat of the conventional submersible pump has neither air cooling nor liquid cooling, and is seriously vulnerable to damage due to heat generation. The prior art discloses a dry-type motor frequency conversion high-speed dive, in order to solve the problem that generates heat of bearing, designs the cooling oil pocket that both ends area mechanical seal, cools off high-speed slide bearing alone. However, the connector lug of the structure is immersed in a medium, the problem of wiring insulation cannot be solved, potential safety hazards exist, and the popularization and application of the pump are affected.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a high-power high-speed submersible pump, aiming at solving the problems that an upper bearing seat for the high-power high-speed submersible pump generates heat seriously and the wiring is unsafe, the invention designs an upper bearing seat dry cavity and an upper bearing seat wet cavity, introduces medium water into the wet cavity outside the upper bearing seat, cools and dissipates the heat of the upper bearing seat, and places three wiring terminals of a motor in the dry cavity for insulation safety.

The present invention achieves the above-described object by the following technical means.

A high-power high-speed submersible pump comprises a motor shell and a middle section shell, wherein a gap between the motor shell and the middle section shell is a middle section cavity, and the middle section cavity is communicated with a pump cover cavity; one end of a shaft of the motor is supported in an upper bearing seat, a bearing cavity is arranged in the upper bearing seat, the lower end of the bearing cavity is connected with a motor outer shell, the upper end of the bearing cavity is connected with an upper pump cover inner shell, the upper bearing seat and the upper pump cover inner shell form a sealed upper bearing seat dry cavity, and a power-on element used for being connected with the motor in the motor outer shell is installed in the upper bearing seat dry cavity; an upper bearing seat wet cavity communicated with the pump cover cavity is arranged around the outside of the bearing cavity, and the upper bearing seat wet cavity is not communicated with the upper bearing seat dry cavity.

Further, the lower end of the bearing cavity is connected with a bottom plate, an annular lower spigot is arranged on the bottom plate, and the annular lower spigot is matched with a spigot of a motor shell; the upper end of the bearing cavity is connected with the cover plate, the cover plate is provided with an annular upper spigot, and the annular upper spigot is matched with a spigot of an inner shell of the upper pump cover.

Furthermore, the wet cavity of the upper bearing pedestal is a cavity with an open periphery, which is formed by a cover plate, a bottom plate and a bearing cavity, and the cavity is communicated with the pump cover cavity.

Furthermore, a fan-shaped notch is formed in the cover plate, and a fan-shaped area of the upper bearing seat dry cavity is formed between the fan-shaped notch and the bottom plate through a fan-shaped shell.

Further, the cross-sectional area of the sector area of the dry cavity of the bearing seat is smaller than that of the wet cavity of the upper bearing seat.

Furthermore, a plurality of wiring holes are formed in the bottom plate, and electrifying elements are installed on the wiring holes.

Further, a sealing ring is arranged between the annular lower spigot and the motor shell; and a sealing ring is arranged between the annular upper spigot and the inner shell of the upper pump cover.

The invention has the beneficial effects that:

according to the high-power high-speed submersible pump, the upper bearing seat dry cavity and the upper bearing seat wet cavity are designed, medium water is introduced into the wet cavity outside the upper bearing seat, the upper bearing seat is cooled and radiated, the three wiring terminals of the motor are placed in the dry cavity, the wiring terminals are prevented from contacting with a liquid medium, and insulation safety is guaranteed.

Drawings

Fig. 1 is a partial view of a high-power high-speed submersible pump according to the present invention.

Fig. 2 is a sectional view of the upper bearing housing according to the present invention.

Fig. 3 is a cross-sectional view C-C of fig. 2.

In the figure:

1-middle section; 2-motor housing; 3-axis; 4-upper pump cover shell; 5-upper pump cover inner shell; 6-upper bearing seat; 7-sealing ring; 8-a binding post; 9-a bearing; a1-middle section cavity entrance; A2-Pump Outlet; q1-middle section cavity; q2-upper bearing block dry chamber; q3-upper bearing block wet chamber; q4-pump cap cavity; 6A 1-rib plate; 6A 2-Wiring hole; 6A 3-arc surface; 6A 4-radius surface; 6A 5-bottom plate; 6a 6-bearing cavity; 6A 7-cover plate; 6A 8-Upper spigot; 6A 9-lower spigot;

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

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 drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, the high-power high-speed submersible pump of the present invention includes a motor housing 2 and a middle housing 1, wherein a gap between the motor housing 2 and the middle housing 1 is a middle cavity Q1 for conveying a medium; a motor assembly is arranged in the motor shell 2, one end of a shaft 3 of the motor is supported in an upper bearing seat 6, the other end of the shaft 3 of the motor is supported in a lower bearing seat, an impeller is arranged at the other end of the shaft 3, and the shaft 3, the motor shell 2 and the middle section shell 1 are coaxially arranged; the middle section shell 1 located at one end of the impeller is a pump inlet, the pump cover shell 4 is installed at the other end of the middle section shell 1, and the pump cover shell 4 is a pump outlet A2. The cavity in the upper pump cover shell 4 is a pump cover cavity Q4, and the middle section cavity Q1 is communicated with a pump cover cavity Q4; a bearing cavity 6A6 is arranged in the upper bearing seat 6, the lower end of the bearing cavity 6A6 is connected with the motor outer shell 2, the upper end of the bearing cavity 6A6 is connected with the upper pump cover inner shell 5, the upper bearing seat 6 and the upper pump cover inner shell 5 form a sealed upper bearing seat dry cavity Q2, a binding post 8 used for connecting a motor in the motor outer shell 2 is installed in the upper bearing seat dry cavity Q2, the binding post 8 is ensured not to be contacted with a liquid medium, and insulation safety is realized; an upper bearing seat wet cavity Q3 communicated with the pump cover cavity Q4 is arranged around the bearing cavity 6A6, and the upper bearing seat wet cavity Q3 is not communicated with the upper bearing seat dry cavity Q2. And medium water is introduced into the upper bearing seat wet cavity Q3 to cool and dissipate heat of the upper bearing seat.

As shown in fig. 2 and 3, the lower end of the bearing cavity 6a6 is connected with a bottom plate 6a5, an annular lower spigot 6a9 is arranged on the bottom plate 6a5, and the annular lower spigot 6a9 is matched with a spigot of the motor housing 2; an O-shaped ring is arranged on the annular lower spigot 6A9 and used for sealing between the annular lower spigot 6A9 and the motor shell 2; the upper end of the bearing cavity 6A6 is connected with a cover plate 6A7, an annular upper spigot 6A8 is arranged on the cover plate 6A7, and the annular upper spigot 6A8 is matched with a spigot of an inner shell 5 of the upper pump cover; and an O-shaped ring is arranged on the annular upper spigot 6A8 and used for sealing between the annular upper spigot 6A8 and the upper pump cover inner shell 5.

The upper bearing seat wet cavity Q3 is a cavity with an open periphery, which is surrounded by a cover plate 6A7, a bottom plate 6A5 and a bearing cavity 6A6, and the cavity is communicated with a pump cover cavity Q4. A fan-shaped notch is formed in the cover plate 6A7, and a fan-shaped area of the upper bearing seat dry cavity Q2 is formed between the fan-shaped notch and the bottom plate 6A5 through a fan-shaped shell. The cross-sectional area of the sector of the dry bearing housing chamber Q2 is less than the cross-sectional area of the wet upper bearing housing chamber Q3. A plurality of wiring holes 6A2 are formed in the bottom plate 6A5, and energizing elements are mounted on the wiring holes 6A 2. As shown in fig. 1, an electricity connection box or an electricity connection hole is eccentrically installed on the upper pump cover shell 4 and is used for an external power supply; the bearing seat dry cavity Q2 is positioned on the same side with the power connection box or the power connection hole. The traditional upper pump cover inner shell 5 and the traditional upper pump cover outer shell 4 are parallel and level at the same plane, a certain distance exists between the bottom of the upper pump cover inner shell 5 and the bottom of the upper pump cover outer shell 4 in the vertical direction, namely, the upper pump cover inner shell 5 is shortened by a certain length relative to the upper pump cover outer shell 4, the shortened part is supplemented by the upper bearing seat 6, and the upper bearing seat 6 is convenient to be connected with the motor shell 2 and the upper pump cover inner shell 5.

When the submersible pump works, the shaft 3 and the rotor fixed on the shaft run in the lower bearing seat and the upper bearing seat 6, and the upper bearing seat 6 generates heat seriously due to friction because of high linear speed and high power. When the pump runs, liquid medium enters the middle-section cavity Q1 from the middle-section cavity inlet A1, part of the medium flows through the upper bearing seat wet cavity Q3 and the pump cover cavity Q4 and then flows out of the pump outlet A2, heat of the upper bearing seat 6 is taken away, and the upper bearing seat 6 is prevented from being burnt due to overhigh temperature rise; the fluid medium does not flow through the upper bearing housing dry chamber Q2, so the terminal 8 is safe.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A high-power high-speed submersible pump comprises a motor shell (2) and a middle section shell (1), wherein a gap between the motor shell (2) and the middle section shell (1) is a middle section cavity (Q1), and the middle section cavity (Q1) is communicated with a pump cover cavity (Q4); one end of a shaft (3) of the motor is supported in an upper bearing seat (6), and the motor is characterized in that a bearing cavity (6A6) is arranged in the upper bearing seat (6), the lower end of the bearing cavity (6A6) is connected with a motor outer shell (2), the upper end of the bearing cavity (6A6) is connected with an upper pump cover inner shell (5), the upper bearing seat (6) and the upper pump cover inner shell (5) form a sealed upper bearing seat dry cavity (Q2), and an electrifying element used for being connected with a motor in the motor outer shell (2) is installed in the upper bearing seat dry cavity (Q2); an upper bearing seat wet cavity (Q3) communicated with the pump cover cavity (Q4) is arranged around the outside of the bearing cavity (6A6), and the upper bearing seat wet cavity (Q3) is not communicated with the upper bearing seat dry cavity (Q2).

2. The high-power high-speed submersible pump according to claim 1, characterized in that the lower end of the bearing cavity (6A6) is connected with a bottom plate (6A5), an annular lower spigot (6A9) is arranged on the bottom plate (6A5), and the annular lower spigot (6A9) is matched with a spigot of a motor shell (2); bearing chamber (6A6) upper end is connected with apron (6A7), be equipped with annular tang (6A8) on apron (6A7), tang (6A8) and last pump cover inner shell (5) tang cooperation on the annular.

3. The high power high speed submersible pump according to claim 2, wherein the upper bearing housing wet chamber (Q3) is a peripherally open cavity enclosed by the cover plate (6a7), the bottom plate (6a5) and the bearing chamber (6a6), and the cavity communicates with the pump head chamber (Q4).

4. The high-power high-speed submersible pump according to claim 2, characterized in that the cover plate (6A7) is provided with a fan-shaped notch, and a fan-shaped area of the upper bearing seat dry cavity (Q2) is formed between the fan-shaped notch and the bottom plate (6A5) through a fan-shaped shell.

5. The high power high speed submersible pump according to claim 4, wherein the cross sectional area of the sector of the bearing housing dry chamber (Q2) is smaller than the cross sectional area of the upper bearing housing wet chamber (Q3).

6. The high-power high-speed submersible pump according to claim 2, characterized in that the bottom plate (6A5) is provided with a plurality of wiring holes (6A2), and the wiring holes (6A2) are provided with energizing elements.

7. The high-power high-speed submersible pump according to claim 2, characterized in that a sealing ring is arranged between the annular lower spigot (6A9) and the motor shell (2); and a sealing ring is arranged between the annular upper spigot (6A8) and the upper pump cover inner shell (5).