CN211692841U

CN211692841U - Two-stage canned motor pump

Info

Publication number: CN211692841U
Application number: CN202020023775.1U
Authority: CN
Inventors: 杨志元; 魏骁; 田来; 刁恩聪
Original assignee: Dalian Huanyou Canned Pump Co ltd
Current assignee: Dalian Huanyou Canned Pump Co ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-10-16
Anticipated expiration: 2030-01-07

Abstract

The utility model provides a doublestage canned motor pump, including canned motor and pump part, pump part is installed under canned motor, and canned motor's output shaft downwardly extending is in pump part, its characterized in that: the pump part includes the pump body, the pump cover, primary impeller and secondary impeller, the pump cover is installed under the pump body, cavity and lower cavity have been seted up respectively to the top and the below of the pump body, go up the cavity and be equipped with the runner between the lower cavity, communicate between the transport initial segment of runner and the lateral wall of last cavity, communicate between the transport initial segment of runner and the lower cavity below, primary impeller and secondary impeller all overlap and establish outside the output shaft of canned motor and lie in cavity and lower cavity respectively, primary impeller sets up with secondary impeller's sunction inlet in opposite directions, be equipped with input channel and output channel on the lateral wall of the pump body, communicate between last section of transport of input channel and the last cavity top, communicate between output channel's the lateral wall of transport initial segment and lower cavity, canned motor drive primary impeller and secondary impeller are rotary motion.

Description

Two-stage canned motor pump

Technical Field

The utility model relates to a canned motor pump field specifically is a doublestage canned motor pump.

Background

The shield pump is used as a centrifugal pump for conveying flammable, explosive, volatile, corrosive and extremely toxic liquids, and is widely applied to important fields of petrochemical industry, aerospace, national defense and military industry, environmental protection and the like.

The canned motor pump comprises a canned motor and a pump part, when the canned motor pump works, a rotor shaft of the canned motor drives a thrust disc to rotate, the pump part generates unbalanced axial force to the rotor shaft, the axial force drives the rotor shaft to drive the thrust disc to move along the axial direction of the rotor shaft, the thrust disc aggravates the pressure on one side of the axial direction of a graphite bearing in the canned motor, the axial load of the graphite bearing is increased, the graphite bearing is aggravated in abrasion, and the service life of the canned motor pump is shortened.

Disclosure of Invention

An object of the utility model is to provide a doublestage canned motor pump to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a two-stage canned motor pump comprises a canned motor and a pump part, wherein the pump part is arranged below the canned motor, an output shaft of the canned motor extends downwards into the pump part, the pump part comprises a pump body, a pump cover, a first-stage impeller and a second-stage impeller, the pump cover is arranged below the pump body, an upper concave cavity and a lower concave cavity are respectively arranged above and below the pump body, a flow channel is arranged between the upper concave cavity and the lower concave cavity, a conveying initial section of the flow channel is communicated with the side wall of the upper concave cavity, a conveying end section of the flow channel is communicated with the lower part of the lower concave cavity, the first-stage impeller and the second-stage impeller are sleeved outside an output shaft of the canned motor and are respectively positioned in the upper concave cavity and the lower concave cavity, the suction inlets of the first-stage impeller and the second-stage impeller are opposite, an input channel and an output channel are arranged on the side wall of the pump, the conveying initial section of the output channel is communicated with the side wall of the lower concave cavity, and the shielding motor drives the primary impeller and the secondary impeller to rotate so that a conveying medium sequentially passes through the input channel, the primary impeller, the upper concave cavity, the flow channel, the secondary impeller, the lower concave cavity and the output channel.

Further, the flow passage is located in the pump body.

Furthermore, the runner comprises an L-shaped conveying initial section, an inclined conveying middle section and a horizontal conveying end section which are sequentially connected from bottom to top.

The graphite ring is arranged on the partition wall and sleeved outside an output shaft of the shielding motor.

Furthermore, a countersunk hole is formed in the partition wall, and the graphite ring is embedded in the countersunk hole.

The utility model has the advantages that:

the shielding motor drives the primary impeller and the secondary impeller to rotate, so that liquid passes through the input channel, the primary impeller, the upper concave cavity, the flow channel, the secondary impeller, the lower concave cavity and the output channel in sequence, and in the process, the liquid is pressurized twice through the primary impeller and the secondary impeller and has higher lift.

The utility model discloses a suction inlet of primary impeller is in opposite directions to the suction inlet of secondary impeller for the suction direction of primary impeller and secondary impeller is opposite, realizes that the axial water thrust that produces through primary impeller and secondary impeller offsets each other, prevents that the output shaft of canned motor from receiving behind too big axial force to drive the thrust disc and extrude the axial one side of graphite bearing and make this graphite bearing wear and tear aggravation; the pressurized liquid in the end section is conveyed through the flow channel, upward thrust can be applied to the secondary impeller, the thrust is transmitted to the thrust disc through the secondary impeller and the output shaft of the shielding motor in sequence to enable the thrust disc to be subjected to upward force, the effect of reducing the force of the thrust disc pressing the graphite bearing is achieved, the axial load of the graphite bearing is further reduced, the abrasion speed of the graphite bearing is finally reduced, and the effect of prolonging the service life of the shielding motor is achieved.

Drawings

FIG. 1: a front view schematic of a dual stage canned motor pump.

Detailed Description

The invention is further explained below with reference to the drawings:

referring to fig. 1, a two-stage canned motor pump comprises a canned motor 1 and a pump part, the pump part is installed under the canned motor 1 through a plurality of bolts one, an output shaft 11 of the canned motor 1 extends downwards into the pump part, the pump part comprises a pump body 2, a pump cover 3, a primary impeller 4 and a secondary impeller 5, the pump cover 3 is installed under the pump body 2 through a plurality of bolts two, the pump cover 3 is detachable and can conveniently disassemble the primary impeller 4, an upper concave cavity 21 and a lower concave cavity 22 are respectively arranged above and below the pump body 2, a flow channel 23 is arranged between the upper concave cavity 22 and the lower concave cavity 21, a conveying initial section of the flow channel 23 is communicated with a side wall of the upper concave cavity 22, a conveying end section of the flow channel 23 is communicated with the lower part of the lower concave cavity 21, the primary impeller 4 and the secondary impeller 5 are both sleeved outside the output shaft 11 of the canned motor 1, the primary impeller 4 and the secondary impeller 5 are respectively located in the upper concave cavity 21 and, the suction inlets of the primary impeller 4 and the secondary impeller 5 are oppositely arranged, the side wall of the pump body 2 is provided with an input channel 24 and an output channel 25, the input channel 24 and the output channel 25 are integrated with the pump body 2, the conveying tail section of the input channel 24 is communicated with the upper part of the upper concave cavity 21, the conveying starting section of the output channel 25 is communicated with the side wall of the lower concave cavity 22, and the output channel 25 is positioned at the rear side of the pump body 2;

the shielding motor 1 drives the primary impeller 4 and the secondary impeller 5 to rotate, so that liquid passes through the input channel 24, the primary impeller 4, the upper concave cavity 21, the flow channel 23, the secondary impeller 5, the lower concave cavity 22 and the output channel 25 in sequence, and in the process, the liquid is pressurized twice through the primary impeller 4 and the secondary impeller 5, and has high lift.

The utility model discloses a suction inlet of primary impeller 4 is in opposite directions to the suction inlet of secondary impeller 5, makes the suction direction of primary impeller 4 opposite to that of secondary impeller 5, realizes that the axial water thrust generated by primary impeller 4 and secondary impeller 5 offsets each other, prevents that the axial force received by output shaft 11 of canned motor 1 from driving thrust disc 12 to extrude one axial side of graphite bearing 13 to make the abrasion of graphite bearing 13 aggravate; the pressurized liquid in the tail section is conveyed through the flow passage 23, upward thrust can be applied to the secondary impeller 5, the thrust is transmitted to the thrust disc 12 through the secondary impeller 5 and the output shaft 11 of the shielding motor 1 in sequence to enable the thrust disc 12 to bear upward force, the force of the thrust disc 12 pressing down on the graphite bearing 13 is reduced, the axial load of the graphite bearing 13 is further reduced, the abrasion speed of the graphite bearing 13 is finally reduced, and the effect of prolonging the service life of the shielding motor 1 is achieved.

Further, referring to fig. 1, the flow passage 23 is located in the pump body 2.

Further, the flow passage 23 includes an L-shaped conveying initial section, an inclined conveying middle section, and a horizontal conveying final section, which are sequentially connected from bottom to top.

Further, the shielding motor comprises a graphite ring 6, the conveying end section of the flow channel 23 is located right above the conveying end section of the input channel 24, a partition wall is arranged between the conveying end section of the flow channel 23 and the conveying end section of the input channel 24, and the graphite ring 6 is installed on the partition wall and sleeved outside the output shaft 11 of the shielding motor 1.

Furthermore, a countersunk hole is arranged on the partition wall, and the graphite ring 6 is embedded in the countersunk hole.

The pressurized liquid in the conveying end section of the flow channel 23 applies downward pressure to the graphite ring 6 to enable the graphite ring 6 to keep tightly attached to the bottom surface of the countersunk hole, so that the graphite ring 6 is ensured to be fixed in the countersunk hole, the graphite ring 6 is effectively prevented from being separated from the countersunk hole, a large amount of liquid in the conveying end section of the flow channel 23 flows back into the input channel 24, and the working efficiency is reduced.

The graphite ring 6 has the characteristics of high temperature resistance and corrosion resistance, and is high in stability, so that the graphite ring is difficult to be influenced by liquid in the pump body 2; the graphite ring 6 also has the self-lubricating characteristic, so that the inner peripheral wall of the graphite ring 6 can be completely attached or approximately attached to the periphery of the output shaft 11 of the shielding motor 1, the output shaft 11 of the shielding motor 1 is not hindered from rotating, and finally the amount of liquid in the flow channel 23 flowing back into the input channel 24 through the space between the graphite ring 6 and the output shaft 11 of the shielding motor 1 can be reduced to the maximum extent; directly rubbing with the pump body 2 when can also avoiding shielding motor 1's 11 radial runout of output shaft through graphite ring 6 simultaneously and leading to its inside wearing and tearing, when treating maintenance cycle to expire, avoid changing whole pump body 2, only need change graphite ring 6 can, reduced the maintenance cost.

Further, referring to fig. 1, the axial direction of the input channel 24 and the output channel 35 is the same as the left-right direction.

Further, referring to fig. 1, the inlet of the input channel 24 is opposite to the outlet of the output channel 25, the inlet of the input channel 24 faces to the right, and the outlet of the output channel 25 faces to the left.

The above is not intended to limit the technical scope of the present invention, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are all within the scope of the technical solution of the present invention.

Claims

1. A dual stage canned motor pump comprising a canned motor and a pump section, the pump section being mounted below the canned motor with an output shaft of the canned motor extending downwardly into the pump section, wherein: the pump part comprises a pump body, a pump cover, a primary impeller and a secondary impeller, the pump cover is arranged below the pump body, an upper concave cavity and a lower concave cavity are respectively arranged above and below the pump body, a flow passage is arranged between the upper concave cavity and the lower concave cavity, the conveying initial section of the runner is communicated with the side wall of the upper concave cavity, the conveying end section of the runner is communicated with the lower part of the lower concave cavity, the primary impeller and the secondary impeller are sleeved outside an output shaft of the shielding motor and are respectively positioned in the upper concave cavity and the lower concave cavity, the suction inlets of the primary impeller and the secondary impeller are opposite, the side wall of the pump body is provided with an input channel and an output channel, the conveying tail section of the input channel is communicated with the upper part of the upper concave cavity, the conveying initial section of the output channel is communicated with the side wall of the lower concave cavity, and the shielding motor drives the primary impeller and the secondary impeller to rotate.

2. The dual stage canned pump of claim 1, wherein: the flow passage is positioned in the pump body.

3. The dual stage canned pump of claim 2, wherein: the runner comprises an L-shaped conveying initial section, an inclined conveying middle section and a horizontal conveying end section which are sequentially connected from bottom to top.

4. The dual stage canned pump of claim 3, wherein: the graphite ring is arranged on the partition wall and sleeved outside an output shaft of the shielding motor.

5. The dual stage canned pump of claim 4, wherein: the partition wall is provided with a countersunk hole, and the graphite ring is embedded in the countersunk hole.