WO2015000153A1

WO2015000153A1 - Conical rotor pump

Info

Publication number: WO2015000153A1
Application number: PCT/CN2013/078771
Authority: WO
Inventors: 李霖
Original assignee: Li Lin
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2015-01-08

Abstract

A conical rotor pump, comprising a stator (1) and a rotor (2); the stator (1) is provided with the rotor (2) therein in clearance fit with the stator; the liquid inlet end of the stator (1) is provided with a liquid inlet cavity (3) comprising a pump inlet (31); the liquid outlet end of the stator (1) is provided with a liquid outlet cavity (4) comprising a pump outlet (41); the rotor (2) has a conical structure with the diameter of the liquid outlet end being greater than the diameter of the liquid inlet end; and the inclined side of the rotor (2) is provide with a helical groove pushing the fluid from the liquid inlet cavity (3) into the liquid outlet cavity (4). The conical rotor pump achieves a higher lift and better installation precision, and effectively adjusts the clearance between the stator (1) and the rotor (2).

Description

Cone rotor pump

Technical field

The invention relates to the field of pump technology, in particular to the improvement of the pump structure for improving the pumping head, and is a novel ultra-low specific speed vane pump.

Background technique

A pump is a machine that converts the mechanical energy of a prime mover into a pumping medium (single-phase liquid, gas, solid; multi-phase liquid-solid mixing, gas-liquid mixing, etc.). According to incomplete statistics, the electricity consumed by pumps accounts for about 20% of the country's total electricity generation.

Pumps are classified according to their operating characteristics: vane pumps, positive displacement pumps and other types of pumps.

Single stage centrifugal pumps are the most widely used vane pumps in all pumps. After the centrifugal pump starts running, under the action of the centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller flow channel is swung around, pressed into the volute, and the impeller inlet forms a vacuum. The water in the pool is along the suction pipe under the external atmospheric pressure. Inhalation supplements this space. The water that is inhaled is then taken out by the impeller through the volute and into the outlet pipe, and the work flow is completed again and again. The structure of the vane pump, the gap between the impeller and the pump casing is large, and it is usually used for low lift and large flow conditions, such as axial flow pump, the efficiency can reach more than 90%. In order to obtain a high lift, the centrifugal pump generally narrows the impeller flow path outlet, the impeller diameter is enlarged, and the specific rotation number ns is reduced as much as possible, and the specific rotation number ns is controlled at 30 < ns < 80. Usually, the pump adopts this specific rotation range. If it is lower than 30, it is usually used in series with multi-stage small-diameter impellers, sometimes superimposed to dozens of impellers; if it is lower than 15, the vane pump is not used, the volumetric pump is used, and the gears in the common volume pump category are used. Pump or plunger pump.

Compared with the vane pump, the volumetric pump is easy to obtain a high lift when pumping a small flow medium, but the volumetric characteristics cause the medium to pulsate during the working process, the pressure fluctuates, the pump body wears a large amount, and must be regularly maintained, and the cleanliness of the medium. The requirements are high, the noise is high, the use cost is high, and the scope of use is limited.

Summary of the invention

In summary, the object of the present invention is to solve the technical deficiencies that occur in the high-lift and low-flow conditions of the existing vane pump and the positive displacement pump, and propose a cone-type rotor pump that can better solve such problems.

In order to solve the technical problem of the present invention, the technical solution adopted is: a cone type rotor pump, characterized in that the rotor pump comprises a stator, and a rotor with a clearance fit is arranged in the stator; The liquid end is provided with a liquid inlet chamber including a pump inlet, and the liquid outlet end of the stator is provided with a liquid discharge chamber including a pump outlet; the rotor is a tapered structure having a liquid outlet end diameter larger than a diameter of the liquid inlet end, and the rotor is inclined A spiral groove is provided on the side for propelling the fluid in the inlet chamber into the outlet chamber.

The angle between the inclined side surface of the stator and the cone rotor axis is greater than 0.1° and less than 89°.

The angle between the inclined side surface of the stator and the tapered rotor axis is preferably greater than 0.1° and less than 45°.

The gap between the stator and the tapered rotor is 0.01 to 1 mm.

The depth of the spiral groove gradually becomes shallower from the liquid inlet end to the liquid discharge end.

The tapered rotor is connected to the bearing box by the liquid inlet end, and is connected to the motor through the bearing box.

When the tapered rotor pump is a small single-stage pump, the rotor and the motor shaft can be directly fixedly connected according to the situation, and the stator is fixedly connected to the motor casing through the connecting member.

The rotor pump is a multi-stage pump, comprising two or more single-stage pumps composed of the stator and the rotor, each group of single-stage pumps being synchronously driven by a motor on the same straight line, and each group of single-stage pumps adopts a first-stage pump The combination of series connection or the combination of the liquid discharge ends; when the combination of the liquid discharge ends is combined, the spiral directions of the spiral grooves on the opposite rotors are opposite. When two and two units are connected in series to form a multi-stage pump, the medium enters from one end and the other end goes out, which can increase the lift of the pump, reduce the equipment volume and equipment cost; when two or more outlets are combined When combined, the medium enters from both ends, and the middle is out, which can increase the flow of the pump and eliminate the axial force.

The beneficial effects of the present invention are: the inner cavity of the invention is a combination of a tapered stator and a tapered rotor, and the spiral groove on the tapered rotor rotates at a high speed in the stator, and the spiral groove exerts a force on the liquid in the groove, and on the other hand, pushes The liquid overcomes the frictional force for circular motion, and on the other hand, it pushes the liquid forward to obtain the lift of the pump. The friction generated by the viscous force acts on the liquid in the groove to generate the axial back pressure, and the stator and the cone rotor are opposite to the liquid. The total axial thrust forms the pumping pressure. Compared with the existing centrifugal pump impeller structure, the gap between the rotor and the stator is small. Under the premise of the same flow rate and shaft power, the lift is obtained higher than the centrifugal pump. High efficiency. It can meet the process requirements of high lift and small flow, and is an ultra-low specific speed vane pump.

Compared with the equal-diameter threaded pump, the tapered rotor pump of the present invention can obtain a higher head with a lead of the same length, a characteristic of a tapered structure, and a radial interference with the stator when the axial displacement of the rotor is performed, thereby facilitating the alignment. The installation accuracy can be controlled to effectively adjust the gap between the stator and the rotor to achieve higher efficiency of the pump. The structure of the rotor cone type makes it have the function of the induction wheel. The different depths of the spiral before and after the rotor can better avoid the occurrence of cavitation and improve the service life of the pump.

The cone type rotor pump of the invention has the advantages of simple structure, the reliability of the vane pump and the high lift and low flow rate of the volume pump, the medium without pulsation during the working process, the low noise of the equipment operation, the good cavitation resistance and the high reliability, which is ideal. High lift low flow new pump class.

DRAWINGS

1 is a schematic view showing the structure of a cone-type single-stage pump according to the present invention;

2 is a schematic structural view of the present invention when a bearing housing is not used;

Figure 3 is a schematic view showing the structure of the two groups of single-stage cone pump liquid outlets when they are combined;

Figure 4 is a schematic view showing the structure of the structure of Figure 3 when the bearing housing is not used;

FIG. 5 is a schematic structural view of the present invention when two sets of single-stage cone pumps are combined in series.

detailed description

The structure of the present invention will be further described below in conjunction with the drawings and preferred embodiments of the invention.

Referring to FIG. 1, the present invention comprises a stator 1 having a tapered inner cavity, and a cone rotor 2 matched with the gap is disposed in the inner cavity of the stator 1; the liquid inlet end of the stator 1 is provided with a pump The inlet chamber 3 of the inlet 31, the liquid outlet end of the stator 1 is provided with a liquid outlet chamber 4 including a pump outlet 41, and the cone rotor 2 is provided with a spiral groove for driving the fluid in the liquid inlet chamber to advance into the liquid outlet chamber; Since the end of the spiral groove of the tapered rotor 2 is subjected to a resistance greater than that of the front end, in order to maintain or increase the speed of the liquid pushing the end of the spiral groove, the tapered rotor 2 has a tapered structure with a diameter larger than the diameter of the liquid inlet end, and the tapered structure can be The linear velocity of the outlet end of the cone rotor 2 is greater than the linear velocity of the inlet end of the cone rotor 2; the angle α between the inclined side of the cone rotor 2 and the cone rotor axis may be greater than 0.1° and less than 89°; It is preferably greater than 0.1° and less than 45°; the gap between the stator 1 and the tapered rotor 2 is controlled to be between 0.01 and 1 mm. Since the end of the spiral groove of the rotor 2 is subjected to a resistance greater than that of the front end, in order to ensure the flow rate, the depth of the spiral groove gradually becomes shallow from the liquid inlet end to the liquid discharge end.

The outlet end of the tapered rotor 2 is connected to the drive shaft 51 of the bearing housing 5 via the shaft 6. The drive shaft 51 of the bearing housing 5 is connected to the shaft of the motor 7, and the shaft of the motor 7 passes through the coupling and the bearing housing. The drive shaft 51 of the 5 is connected; and the stator 1 is fixedly coupled to the housing 52 of the bearing housing 5 via a connecting member 8. As shown in FIG. 2, in the specific implementation process, when the cone rotor pump of the present invention is a small single-stage pump, the rotor 2 and the motor 7 shaft can be directly fixedly connected according to the situation, and the stator 1 passes through the connecting member 8 and the motor. 7 The casing is fixedly connected, that is, the bearing box is not required, and other structures are the same.

Referring to Figures 3 to 5, when the present invention is a multi-stage pump, the present invention includes two or more stages of a single-stage pump composed of the stator 1 and the rotor 2, that is, the structure of Figure 1 is a single stage. The pump, each single-stage pump can be combined in the end-to-end series mode as shown in FIG. 5, and can also be combined by the liquid-end end joint mode shown in FIG.

Referring to FIG. 3, the two groups of single-stage pump liquid outlets are combined in a common manner, and the liquid outlet ends are also called butt joints, and the two sets of single-stage pumps distributed on the left and right sides are on the same straight line, and the liquid is discharged. The end joints also share a single outlet chamber 4, only one pump outlet 41, two independent pump inlets 31, two sets of single-stage pump cone rotors 2 are synchronously connected, and the spiral groove direction on the two-cone rotor 2 On the contrary, the two conical rotors are synchronously driven by a motor 7 to synchronously rotate. During the implementation, a connecting member 8 and a bearing housing 5 are added between a group of single-stage pumps and the motor 7; as shown in FIG. The connecting piece and the bearing box, the motor 7 and the two sets of single-stage pumps are fixed on the same bottom plate, and the multi-stage pump combined in this way can make up for the technical deficiency of small flow rate.

Referring to FIG. 5, FIG. 5 differs from FIG. 3 in that the two sets of single-stage pumps are on the same straight line, and the first and last series are combined in series, and the two sets of single-stage pumps of the cone rotors 2 are synchronously connected, and the two cone-shaped rotors 2 are connected. The spiral grooves are opposite in direction, and the two conical rotors are synchronously driven by one motor 7 to synchronously rotate. The first-to-tail serial combination is to connect the pump outlet of one single-stage pump with the pump inlet of another single-stage pump, which can further enhance the lift. .

Claims

a conical rotor pump, characterized in that the rotor pump comprises a stator, and a rotor with a clearance fit is arranged in the stator; the inlet end of the stator is provided with a liquid inlet chamber containing a pump inlet, and the stator is discharged The end is provided with a liquid outlet chamber including a pump outlet; the rotor is a cone-shaped structure having a diameter of the liquid outlet end larger than the diameter of the liquid inlet end, and the fluid on the inclined side of the rotor is arranged to drive the fluid in the liquid inlet chamber to the liquid outlet chamber. Pushing the spiral groove.
A tapered rotor pump according to claim 1, wherein said inclined side of said rotor and said rotor axis are at an angle greater than 0.1 and less than 89.
A tapered rotor pump according to claim 2, wherein said inclined side of said rotor and said rotor axis are at an angle greater than 0.1 and less than 45.
The tapered rotor pump according to claim 1, wherein the gap between the stator and the rotor is 0.01 to 1 mm.
A tapered rotor pump according to claim 1, wherein said spiral groove depth gradually becomes shallow from the liquid inlet end to the liquid discharge end.
The tapered rotor pump according to claim 1, wherein said tapered rotor is connected to the bearing housing from the liquid inlet end, and is connected to the motor through the bearing housing.
The tapered rotor pump according to any one of claims 1 to 6, wherein said rotor pump is a multistage pump comprising two or more single-stage pumps consisting of said stator and rotor, each group The single-stage pumps are synchronously driven by a single motor on the same straight line. The single-stage pumps of each group adopt the combination of the first end and the end, or the combination of the liquid discharge ends; when the combination of the liquid discharge ends is combined, the opposite two rotors The helical grooves have opposite spiral directions.