AU2019101710A4

AU2019101710A4 - Air-liquid mixed type self-priming centrifugal pump

Info

Publication number: AU2019101710A4
Application number: AU2019101710A
Authority: AU
Inventors: Fanghong GAO; Junling MA; Jingjiang MAN; Guozheng SUN
Original assignee: Sanlian Pump Industry Co Ltd
Current assignee: Sanlian Pump Industry Co Ltd
Priority date: 2019-01-02
Filing date: 2019-12-27
Publication date: 2020-02-06
Anticipated expiration: 2027-12-27
Also published as: CN109578288A

Abstract

An air-liquid mixed type self-priming centrifugal pump adopts a liquid axial return pump body. In use, after the pump is started, an impeller rotates and both liquid stored in a suction chamber and air in a suction pipeline are introduced into and mixed completely in the impeller. Under the action of a centrifugal force, a pressure is reduced at a front end, a flap valve is opened under an impact force of water, and the liquid enters the pump. Meanwhile, the liquid mixed with the air in the impeller flows towards an outer edge of a volute chamber and forms a white foam band with a certain thickness and an adjustment rotation liquid ring at an outer edge of the impeller. The air-liquid mixture enters an air liquid separation chamber through the pump body, and at this point, since the speed of the liquid is reduced suddenly, the lighter air is separated from the mixture and discharged upwards continuously via a discharge opening of the pump body. The deaerated liquid returns to a liquid reservoir, and enters the impeller via a liquid return hole again. The liquid in the impeller is mixed with the air sucked from the suction pipeline again, and flows towards the outer edge of the impeller again under the action of the impeller rotating at a high speed. The process is repeated until no air is present in the suction pipeline, and the self-priming process is then completed. Air-liquid separation chamber iLiqu rservoir Figure 1

Description

AIR-LIQUID MIXED TYPE SELF-PRIMING CENTRIFUGAL PUMP

TECHNICAL FIELD

The present invention relates to a pump, and in particular, to an air-liquid mixed type self-priming centrifugal pump.

BACKGROUND

A traditional centrifugal pump is unable to realize a self-priming function, and after the pump is stopped, a medium will flow towards an input port due to siphonage. Every time the pump is started, a drainage action must be performed firstly to discharge air in a pump cavity. Each drainage action consumes manpower and material resources, resulting in resource waste.

SUMMARY

In view of the shortcomings in the prior art, the present invention provides an air-liquid mixed type self-priming centrifugal pump, which has a stable structure, a good self-priming effect, a short self-priming time and a small floor area, saves electricity and is environmentally friendly.

The objective of the invention is implemented through the technical proposal as follows.

An air-liquid mixed type self-priming centrifugal pump includes a pump body portion and a rotor portion.

The pump body portion includes a pump body and a detachable front cover connected at a front end of the pump body.

The rotor portion includes a bearing, a pump shaft and an impeller. The bearing is configured to be located in the pump body and connected at a rear end of the pump body. The pump shaft is configured to extend through the bearing to be connected to the impeller.

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A suction inlet and a friction plate are configured to be fixed by a bolt and then mounted at a front end of the impeller.

A discharge flange is provided at an upper portion of the pump body and provided with a water injection cover plate. A backflow flap valve system is provided at the front end of the pump body.

Further, the detachable front cover may be provided with an air-liquid mixing chamber, and may enable effective air-liquid mixing in combination with the pump body.

Further, an air-liquid separation chamber may be provided in the pump body, and air may be allowed to be separated from liquid in the air-liquid separation chamber.

Further, the backflow flap valve system may include a one-way check flap valve fixed by a flap valve block and a movable flap valve block.

Further, a box sealer may be provided and mounted at a rear end of the impeller. A mechanical seal may be provided inside the box sealer. The box sealer may serve as a mechanical seal lubrication cavity while maintaining a clearance from the impeller.

Further, the pump may be provided with a seal cooling system, which may have a front end sealed mechanically, and a rear end sealed by two skeleton oil seals, thereby ensuring that no leakage will occur.

The present invention provides an air-liquid mixed type self-priming centrifugal pump having a liquid axial return pump body structure. In use, when the pump is started, the impeller starts to rotate. Both the liquid stored in a suction chamber and the air in a suction pipeline are introduced into and mixed completely in the impeller. Under the action of a centrifugal force, a pressure is reduced at the front end, the flap valve is opened under an impact force of water, and the liquid enters the pump. Meanwhile, the liquid mixed with the air in the impeller flows towards an outer edge of a volute chamber and forms a white foam band with a certain thickness and an adjustment rotation liquid ring at an outer edge of the impeller. The air-liquid mixture enters the air-liquid separation chamber through the pump body, and at this point, since the speed of the liquid is reduced suddenly, the lighter air is separated from the mixture and discharged upwards continuously via a discharge opening of the pump body. The deaerated liquid returns to a liquid reservoir and then enters the impeller via a liquid return hole again. The liquid in the impeller is then mixed with the air sucked from the suction pipeline again. Under the action of the impeller rotating at a high speed, the liquid flows towards the outer edge of the impeller again. As the process is repeated, the air in the suction pipeline is reduced continuously until no air is present in the suction pipeline. Now, the self-priming process is completed, and the pump starts normal operation. When the pump is stopped, the backflow flap valve system is closed automatically, which prevents the water from flowing back and protects a pipeline system from a water hammer.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to illustrate embodiments of the present invention more clearly, a brief description of drawings that are provided for the illustration of the embodiments will be given as follows. Apparently, the drawings described below show only exemplary embodiments of the present invention and other drawings may be easily obtained by those skilled in the art based on these drawings without creative effort. In the drawings:

Fig. 1 is a schematic structural diagram of an embodiment of the present invention; and

Fig. 2 is a left view of the pump of Fig. 1.

DETAILED DESCRIPTION

Embodiments of the invention will be described in detail below with reference to the accompanying drawings. Apparently, the embodiments described below are merely part of rather than all of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort shall fall within the protection scope of the present invention.

It should be noted that in the description of the embodiments of the present invention, terms such as “vertical”, “upper”, “lower”, “horizontal” refer to positional relationships among and orientations of the different features or components as indicated in the drawings. These relative terms are used herein for convenience of description and are not intended to necessarily indicate or imply that any feature or component is oriented or operated in a particular direction, and therefore should not be construed as a limit to the present invention.

It should also be noted that in the description of the embodiments of the present invention, terms “provided”, “mounted”, and “connected” should be understood broadly unless otherwise specified. For example, the term connected may refer to a fixed, removable, or integral connection; may refer to a mechanical or electrical connection; and may also refer to a direct connection between two features, an indirect connection via an intervening structure between two features, or a communicative connection between two features. The above terms can be understood by those skilled in the art according to specific situations.

As shown in Figs. 1 to 2, an air-liquid mixed type self-priming centrifugal pump includes a pump body portion and a rotor portion.

The pump body portion includes a pump body 1 and a detachable front cover 2 connected at a front end of the pump body.

The rotor portion includes a bearing 8, a pump shaft 9 and an impeller 3. The bearing is located in the pump body and connected at a rear end of the pump body. The pump shaft extends through the bearing to be connected to the impeller.

A suction inlet 4 and a friction plate 5 are fixed by a bolt and then mounted at a front end of the impeller 3.

A discharge flange 11 is provided at an upper portion of the pump body 1 and is provided with a water injection cover plate 12. A backflow flap valve system 13 is provided at the front end of the pump body.

The detachable front cover mentioned above may be provided with an air-liquid mixing chamber, and may enable effective air-liquid mixing in combination with the pump body.

An air-liquid separation chamber may be provided in the pump body, and air may be separated from liquid in the air-liquid separation chamber.

A liquid reservoir may be provided in the pump body and may be located below the pump shaft. The air-liquid separation chamber may be located above the pump shaft.

The backflow flap valve system may include a one-way check flap valve fixed by a flap valve block and a movable flap valve block.

A box sealer 6 may be provided and mounted at a rear end of the impeller 3. A mechanical seal 7 may be provided inside the box sealer 6. The box sealer 6 may serve as a mechanical seal lubrication cavity while maintaining a clearance from the impeller.

The pump may be provided with a seal cooling system. The seal cooling system may have a front end sealed mechanically, and a rear end sealed by two skeleton oil seals, which ensures that no leakage can occur.

In particular, a clearance between the friction plate 5 and the impeller 3, as well as the clearance between the impeller 3 and the box sealer 6, verified by practical experience, may allow a maximum suction height and enable the water pump to run at a high efficiency for a long time, thereby reducing motor power and achieving the aim of saving electricity. The air-liquid mixing chamber defined by the pump body 1 and the front cover 2 enables the air and the liquid to be mixed effectively. The air-liquid separation chamber, provided in a cavity at the rear end of the pump body 1, enables the air to be separated from the liquid physically due to different densities, thereby realizing air-liquid separation. The pump according to the embodiments of the invention overcomes a situation without a suction condition and accomplishes self-priming in just several minutes. In addition, the pump according to the embodiments of the invention

2019101710 27 Dec 2019 solves a series of problems of manpower and material resource consumption, resource waste, or the like caused by a drainage action. The pump is also economical, environmentally friendly and practical, and constitutes a new area of the pump industry.

Although embodiments of the present invention have been shown and illustrated, it shall be understood that various changes, modifications, substitutions and variants could be made hereto by those skilled in the art without departing from the principle and spirit of the present disclosure. The scope of the present invention is defined by the appended claims and equivalents thereof.

Claims

1. An air-liquid mixed type self-priming centrifugal pump, comprising a pump body portion and a rotor portion;

wherein, the pump body portion comprises a pump body and a detachable front cover connected at a front end of the pump body;

wherein, the rotor portion comprises a bearing configured to be located in the pump body and connected at a rear end of the pump body, an impeller, and a pump shaft extending through the bearing to be connected to the impeller;

wherein, a suction inlet and a friction plate are configured to be fixed by a bolt and then mounted at a front end of the impeller; a discharge flange is provided at an upper portion of the pump body and provided with a water injection cover plate; and a backflow flap valve system is provided at the front end of the pump body.

2. The air-liquid mixed type self-priming centrifugal pump according to claim 1, wherein the detachable front cover is provided with an air-liquid mixing chamber.

3. The air-liquid mixed type self-priming centrifugal pump according to claim 1, wherein an air-liquid separation chamber is provided in the pump body, and air is allowed to be separated from liquid in the air-liquid separation chamber.

4. The air-liquid mixed type self-priming centrifugal pump according to claim 1, wherein the backflow flap valve system comprises a one-way check flap valve fixed by a flap valve block and a movable flap valve block.

5. The air-liquid mixed type self-priming centrifugal pump according to claim 1, wherein a box sealer is provided and mounted at a rear end of the impeller, and provided therein with a mechanical seal, preferably, wherein the pump is provided with a seal cooling system which has a front end sealed mechanically, and a rear end sealed by two skeleton oil seals.