CN212838588U

CN212838588U - Spiral inlet device for reducing abrasion of submersible sand conveying pump

Info

Publication number: CN212838588U
Application number: CN202020937126.2U
Authority: CN
Inventors: 王康兵; 王德柱
Original assignee: Wuxi Zhongkang Fluid Technology Co ltd
Current assignee: Wuxi Zhongkang Fluid Technology Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-03-30
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a spiral inlet device for reducing the abrasion of a submersible sand conveying pump, which comprises a middle turning body; the middle rotor is communicated and connected between the motor and the pump head; a feeding channel is arranged inside the intermediate transfer body in a penetrating way; the inlet end of the feeding channel is arranged at one end of the intermediate transfer body close to the position of the motor; the outlet end of the feeding channel is arranged at one end of the intermediate transfer body close to the position of the pump head; the outlet end of the feeding channel is communicated with the inlet end of the pump head; the discharging direction of the outlet end of the feeding channel is consistent with the rotating direction of the impeller in the pump head, so that the sand-containing water flow is guided to be coordinated with the rotation of the first-stage impeller of the submersible sand conveying pump, the abrasion of the impeller is obviously reduced, and the service life of equipment is prolonged; the feed channel is of a spiral structure, the flow path of the water-sand mixture is increased by utilizing the spiral channel, the energy of silt particles is buffered, the kinetic energy is reduced, and even after the silt particles enter the pump cavity, the absolute kinetic energy is also reduced, so that the abrasion of the pump impeller is weakened.

Description

Spiral inlet device for reducing abrasion of submersible sand conveying pump

Technical Field

The utility model relates to the technical field of fluid machinery, especially, relate to a spiral import device who alleviates dive defeated husky pump wearing and tearing.

Background

The submersible sand conveying pump is a multistage centrifugal pump working underground, the pump and a motor are submerged into a liquid medium containing silt particles in a shaft, back pressure is increased in the shaft through a pressurizing device, and the motor drives the multistage centrifugal pump to apply work to sand-containing water flow so as to lift the mixture of silt and water upwards.

In order to increase the head of a submersible sand pump, multi-stage impellers are used, wherein each stage comprises a fixed stator and a rotatable impeller. The impeller has two types of fixed type and floating type. The floating type impeller can axially float, and the axial force generated by each stage of impeller is borne by thrust bearings on the impeller and the guide wheel. The axial thrust generated by the whole pump is borne by a thrust bearing in the protector. The fixed impeller is fixed on the pump shaft and can not axially float or lean against the thrust pad of the guide wheel. The impeller and the differential pressure produce all thrust which is received by the thrust bearing in the protector. For a multistage submersible sand pump, the abrasion of the flow passage component is the biggest threat to the running safety of the pump due to the fact that the conveying medium contains solid particles. Meanwhile, the flow channel of the impeller reaching the high lift is generally narrow, so solid-phase particles can also cause blockage in the flow channel, and serious consequences are caused. At present, for the abrasion of the overflowing parts of the submersible sand conveying pump, an effective solution is not available except for frequently replacing key overflowing parts such as an impeller, a guide vane and the like. The pump head of the common submersible sand pump is connected with the motor through an intermediate connecting section. The water-sand mixture enters the space at the lower part of the pump suction inlet through 4 circumferentially arranged holes on the middle connecting section and then is directly connected to the inlet of the first-stage impeller of the submersible sand conveying pump. The water-sand mixture enters the middle connecting section from four sides, the flow state at the inlet of the first-stage impeller of the submersible sand conveying pump is disordered, the matching performance of solid-liquid two-phase flow and the rotation of the first-stage impeller of the pump is poor, and the abrasion of the first-stage impeller of the pump is serious.

Therefore, a spiral inlet device which has long service life and can reduce the abrasion of the submersible sand conveying pump is needed to be invented.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects existing in the prior art, the utility model provides a spiral import device with long service life for reducing the abrasion of a submersible sand pump.

The technical scheme is as follows: in order to realize the purpose, the utility model discloses a spiral inlet device for reducing the abrasion of a submersible sand conveying pump, which comprises a middle rotating body; the middle rotor is communicated and connected between the motor and the pump head; a feeding channel is arranged in the middle transfer body in a penetrating way; the inlet end of the feeding channel is arranged at one end of the intermediate transfer body close to the position of the motor; the outlet end of the feeding channel is arranged at one end of the intermediate body close to the position of the pump head; the outlet end of the feeding channel is communicated with the inlet end of the pump head; the discharging direction of the outlet end of the feeding channel is consistent with the rotating direction of the impeller in the pump head.

Further, the feed channel is of a spiral structure.

Further, a plurality of the feeding channels are distributed in the transfer body in a central symmetry way.

Furthermore, the inlet ends of the feeding channels are circumferentially and uniformly distributed on the surface of the transfer platform.

Further, a suction piece is arranged between the inlet end of the pump head and the outlet end of the feeding channel in a matched manner; the internal cross-section of the intake member tapers in a direction towards the pump head.

Further, the suction piece is of a cone-shaped cylinder structure.

Further, the suction piece is made of wear-resistant steel materials.

Has the advantages that: the utility model relates to a spiral inlet device for reducing the abrasion of a submersible sand pump, which comprises a middle rotating body; the middle rotor is communicated and connected between the motor and the pump head; a feeding channel is arranged in the middle transfer body in a penetrating way; the inlet end of the feeding channel is arranged at one end of the intermediate transfer body close to the position of the motor; the outlet end of the feeding channel is arranged at one end of the intermediate body close to the position of the pump head; the outlet end of the feeding channel is communicated with the inlet end of the pump head; the discharging direction of the outlet end of the feeding channel is consistent with the rotating direction of the impeller in the pump head, so that the sand-containing water flow is guided to be coordinated with the rotation of the primary impeller of the submersible sand conveying pump, the abrasion of the impeller is obviously reduced, and the service life of equipment is prolonged; the feed channel is of a spiral structure, the spiral channel is utilized to increase the flow path of the water-sand mixture, the energy of silt particles is buffered, and the kinetic energy is reduced, so that the flow state after entering the pump is stable, the impact at the inlet of the first-stage impeller of the submersible sand conveying pump is weakened, and even if the silt particles enter the pump cavity, the absolute kinetic energy of the silt particles is also reduced, so that the abrasion of the pump impeller is weakened.

Drawings

FIG. 1 is a schematic view of the overall structure of an inlet device;

FIG. 2 is a schematic view of the distribution of feed channels;

the device comprises a shaft 1, a motor 2, a pump head 3, a suction piece 4, a middle rotator 9, a feeding channel 91 and a discharge hole 92.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

A spiral inlet device for reducing the abrasion of a submersible sand pump comprises a middle rotator 9; the middle rotating body 9 is communicated and connected between the motor 2 and the pump head 3; a feeding channel 91 is arranged in the middle rotator 9 in a penetrating way; the inlet end of the feeding channel 91 is arranged at one end of the middle rotating body 9 close to the position of the motor 2; the outlet end of the feed channel 91 is arranged at one end of the middle swivel 9 close to the pump head 3; the outlet end of the feed channel 91 is communicated with the inlet end of the pump head 3; the shaft is filled with suspended silt particles, and compressed air is pumped into the well through an air compressor, so that the shaft is filled with backpressure. The pump shaft of the submersible sand conveying pump is in the vertical direction, and the pump head and the motor are arranged in the shaft and submerged in a liquid medium filled with suspended sediment particles. Due to the existence of back pressure in the shaft, the water-sand mixture is pressed into the feed channel 91 of the middle rotator 9 and enters the pump head 3 from the discharge hole 92 to reach the vicinity of the inlet of the first-stage impeller of the submersible sand pump.

The discharging direction of the outlet end of the feeding channel 91 is consistent with the rotating direction of the impeller in the pump head 3, so that the sand-containing water flow is guided to be coordinated with the rotation of the first-stage impeller of the submersible sand conveying pump, the abrasion of the impeller is obviously reduced, and the service life of equipment is prolonged.

The feed channel 91 is of a spiral structure, the spiral channel is utilized to increase the flow path of the water-sand mixture, the energy of silt particles is buffered, and the kinetic energy is reduced, so that the flow state after entering the pump is stable, the impact at the inlet of the first-stage impeller of the submersible sand conveying pump is weakened, and even if the silt particles enter the pump cavity, the absolute kinetic energy of the silt particles is also reduced, so that the abrasion of the pump impeller is weakened.

A plurality of feedstock channel 91 is central symmetry distribution in the transfer body 9, guarantees to reach evenly rapidly to the material of pump head 3 internal transmission, improves conveying efficiency.

The inlet ends of the feed channels 91 are circumferentially and uniformly distributed on the surface of the intermediate rotor 9, so that the water-sand mixture around the intermediate rotor 9 can be rapidly sucked.

A suction piece 4 is arranged between the inlet end of the pump head 3 and the outlet end of the feeding channel 91 in a matching manner; the cross-section of the interior of the suction piece 4 is gradually reduced along the direction close to the pump head 3, so that the material at the feed end of the pump head 3 is concentrated, and efficient transmission is facilitated.

The suction piece 4 is of a conical barrel structure, the profile can be prevented from being changed violently by utilizing a conical surface, the structural strength of the suction piece 4 is enhanced, and deformation caused by vibration is avoided.

The suction piece 4, especially the wall surface of the feeding channel 91 in the suction piece 4 is made of wear-resistant steel materials, so that the wear probability of the suction piece 4 can be delayed, and the running time of equipment is prolonged.

The working principle of the spiral inlet device is as follows: the wellbore is a vertical wellbore 1 filled with a mixture of water and silt. Compressed air is injected into the shaft 1 through an air compressor, back pressure is formed in the shaft 1 at the moment, and therefore sediment particles are in a suspension state in the shaft 1. The submersible sand pump head 3 and the motor 2 are vertically arranged and immersed in the water-sand mixture in the shaft 1, and the motor 2 is positioned below the pump head 3. A central swivel 9 is provided between the motor 2 and the pump head 3. Due to the back pressure present in the shaft 1, the water-sand mixture will be pressed into the intermediate swivel 9. Two feeding channels 91 are arranged in the spiral rising inner flow channel, inlets are in the horizontal direction and form an included angle of 180 degrees with each other, and a water-sand mixture enters the spiral rising feeding channels 91 under the action of back pressure; during the spiral rising process of the water-sand mixture, the kinetic energy is reduced. Furthermore, the feed channel 91, which rises helically, also makes the direction of the medium flow uniform and follows the direction of the helix. At the outlet of the spiral ascending inner flow passage and the discharge hole 92, the direction of the spiral ascending inner flow passage is matched with the rotation direction of the impeller of the submersible sand pump, so that at the inlet of the first-stage impeller of the submersible sand pump, solid-phase particles stably move, the impact degree on the impeller blade is low, the impact of silt on the inlet of the impeller blade is reduced, and the abrasion of the impeller of the submersible sand pump is integrally weakened. Because the two spiral ascending feed channels 91 are in a circumferentially uniform state, the radial unbalance generated when the water-sand mixture flows in the feed channels is weakened, and a circumferentially uniform flow state is formed at the inlet of the first-stage impeller of the submersible sand pump.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a alleviate spiral import device of defeated sand pump wearing and tearing of dive which characterized in that: comprises a middle rotator (9); the middle rotating body (9) is communicated and connected between the motor (2) and the pump head (3); a feeding channel (91) is arranged in the middle rotating body (9) in a penetrating way; the inlet end of the feeding channel (91) is arranged at one end of the middle rotating body (9) close to the position of the motor (2); the outlet end of the feeding channel (91) is arranged at one end of the middle rotator (9) close to the position of the pump head (3); the outlet end of the feeding channel (91) is communicated with the inlet end of the pump head (3); the discharging direction of the outlet end of the feeding channel (91) is consistent with the rotating direction of the impeller in the pump head (3).

2. The spiral inlet device for mitigating wear of a submersible sand pump as recited in claim 1, further comprising: the feed channel (91) is of a spiral configuration.

3. The spiral inlet device for mitigating wear of a submersible sand pump as recited in claim 2, further comprising: the plurality of feeding channels (91) are distributed in the middle rotator (9) in a central symmetry way.

4. A helical inlet device to mitigate wear of a submersible sand pump as recited in claim 3, further comprising: the inlet ends of the feeding channels (91) are circumferentially and uniformly distributed on the surface of the middle rotating body (9).

5. The helical intake apparatus for mitigating wear on a submersible sand pump as recited in claim 4, further comprising: a suction piece (4) is arranged between the inlet end of the pump head (3) and the outlet end of the feeding channel (91) in a matched manner; the internal section of the suction piece (4) is gradually reduced along the direction close to the pump head (3).

6. The screw-type inlet device for reducing wear of a submersible sand pump according to claim 5, wherein: the suction piece (4) is of a conical cylinder structure.

7. The screw-type inlet device for reducing wear of a submersible sand pump according to claim 5, wherein: the suction piece (4) is made of wear-resistant steel materials.