CN114421714A

CN114421714A - Shielding formula multipurpose immersible pump

Info

Publication number: CN114421714A
Application number: CN202210071722.0A
Authority: CN
Inventors: 张文敏
Original assignee: Zhejiang Zheshui Industry And Trade Co ltd
Current assignee: Zhejiang Zheshui Industry And Trade Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-04-29
Anticipated expiration: 2042-01-21
Also published as: CN114421714B

Abstract

The invention discloses a shielding type multipurpose submersible pump, which comprises a motor and a pump body, wherein the motor comprises a shell, a stator, a rotor body, a rotating shaft, an upper end cover and a lower end cover, the upper end cover and the lower end cover are respectively arranged at two ends of the shell, the stator and the rotor body are arranged in the shell, and the rotating shaft is fixedly arranged on the rotor body; the upper end cover extends into the casing to form an upper shaft sleeve, the lower end cover extends into the casing to form a lower shaft sleeve, the rotating shaft penetrates through the upper shaft sleeve and the lower shaft sleeve and extends into the pump body, the rotor body is positioned between the upper shaft sleeve and the lower shaft sleeve, and a locking wear-resistant sheet which is abutted against the rotor body is fixedly arranged on the rotating shaft close to one side of the upper end cover.

Description

Shielding formula multipurpose immersible pump

Technical Field

The invention belongs to the technical field of submersible pumps, and particularly relates to a shielding type multipurpose submersible pump.

Background

The submersible pump is usually simply placed in water for heat dissipation, and the interior of the motor is used for water passing, but the submersible pump is complex in structure, slow in flow speed and not ideal enough in actual use, and impurities such as silt in water easily enter the motor to cause internal abrasion; in addition, the water pump needs to be at a higher rotating speed in order to obtain a higher lift, but the running stability of a motor in the water pump is reduced along with the increase of the rotating speed, and the performance of the water pump is influenced, so that how to effectively improve the running stability of the motor is particularly important; further improvements are therefore desirable.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a water-cooled shielding type multipurpose submersible pump with a simple structure.

In order to achieve the purpose, the invention provides the following technical scheme: a shielding type multipurpose submersible pump comprises a motor and a pump body, wherein the motor comprises a shell, a stator, a rotor body, a rotating shaft, an upper end cover and a lower end cover, the upper end cover and the lower end cover are respectively arranged at two ends of the shell, the stator and the rotor body are arranged in the shell, and the rotating shaft is fixedly arranged on the rotor body; the upper end cover extends into the machine shell to form an upper shaft sleeve, the lower end cover extends into the machine shell to form a lower shaft sleeve, the rotating shaft penetrates through the upper shaft sleeve and the lower shaft sleeve and extends into the pump body, the rotor body is positioned between the upper shaft sleeve and the lower shaft sleeve, and a stop wear-resistant sheet which is abutted against the rotor body is fixedly arranged on the rotating shaft close to one side of the upper end cover and is not contacted with the upper shaft sleeve; the rotor body comprises a rotor and a shielding sleeve, the shielding sleeve is cylindrical, one side of the shielding sleeve, which is close to the upper end cover, is a closed end, a shaft hole for the rotating shaft to pass through is formed in the closed end, and the stop wear-resistant sheet abuts against the outer side of the closed end of the shielding sleeve; the shell is of an inner-outer double-layer structure, a shielding cavity is formed between the two layers of shells, the stator is arranged in the shielding cavity, and resin is filled in the shielding cavity; the upper end cover further comprises:

the mounting edge is integrally formed on the upper end cover and extends towards the opposite direction of the machine shell,

a filtering baffle plate which is provided with a through hole and is fixedly arranged on the mounting edge,

a filtering silk floss block, a filtering chamber is formed between the mounting edge and the filtering baffle plate, the filtering silk floss block is arranged in the filtering chamber,

a limiting support edge is integrally formed in one side, close to the outer end face of the upper end cover, in the upper shaft sleeve, a gap is formed between the rotating shaft and the limiting support edge, one end of the rotating shaft extends out of one side of the limiting support edge close to the end face of the upper end cover,

the cooling water absorption impeller is arranged at the end of the rotating shaft close to one side of the limiting support edge;

an inner baffle plate, the upper shaft sleeve and the upper end cover are coaxially arranged, a water through hole communicated with the inner part of the upper shaft sleeve is arranged on the end surface of the upper end cover,

the lower end cover also comprises a lower end cover,

the sealing support edge is integrally formed in one side, close to the direction of the rotor body, of the lower shaft sleeve, and the rotating shaft is in clearance fit with the sealing support edge;

a sealing element which is abutted against the side wall of the rotating shaft is arranged on the lower shaft sleeve on one side of the sealing support edge, which is far away from the rotor body, an over-clearance gap is formed between the shell on the inner side of the stator and the rotor body, a water outlet which is communicated with the interior of the shell and the pump body is arranged on the outer side of the lower end cover, which is positioned on the lower shaft sleeve, and a filter element is arranged on the water outlet; the middle part of the pump body is provided with and describes axle fixed connection's pump impeller, and the both sides that the pump body is located the pump impeller are formed with last intake antrum and lower intake antrum, and the lateral wall one end of the pump body is provided with the last inlet opening with last intake antrum intercommunication, and the one end that the motor was kept away from to the pump body is formed with the lower inlet with lower intake antrum intercommunication, and is provided with the delivery port in the lateral wall middle part of body, outlet and last intake antrum intercommunication.

The invention is further configured to: the motor further comprises:

the axial thrust assembly is abutted against one end of the shielding sleeve belt opening of the rotor body, and a graphite thrust sheet, an alloy friction sheet and a universal fine-tuning friction sheet seat are sequentially arranged between the rotor body and the lower shaft sleeve from the rotor body to the lower shaft sleeve direction, and a sealing limit edge abutted against the cooling water absorption impeller is formed on the end surface of the lower shaft sleeve;

a sealing groove is formed in the lower shaft sleeve on one side, far away from the rotor body, of the sealing support edge, and the sealing element is arranged on the sealing groove;

two side walls of the sealing groove are provided with limit convex parts,

the two sides of the sealing element are provided with limiting grooves which are abutted against the limiting convex parts and are in sliding fit with the limiting convex parts, and the sealing property of the connection between the sealing element and the sealing groove can be ensured by the abutting of the limiting grooves and the limiting concave parts;

the cross section of the limiting groove is rectangular, the limiting convex part is an isosceles trapezoid formed by sequentially connecting a first contact part, a middle contact part and a second contact part, the middle contact part abuts against the bottom of the limiting groove, and a bearing fillet part is respectively arranged at the joint of the first contact part and the middle contact part and the joint of the second contact part and the middle contact part, so that the bearing fillet part can reduce the extrusion and abrasion to the sealing element;

the height of the isosceles trapezoid-shaped limiting convex part is H1, the length of the lower bottom of the isosceles trapezoid-shaped limiting convex part is L1, the depth of the limiting groove is H2, the width of the limiting groove is L2, H1 is more than H2, and L2 is more than L1. The rotating shaft of the motor is a ceramic spraying rotating shaft, and in order to reduce the abrasion of the sealing element, a layer of wear-resistant coating can be coated on the sealing element, so that the wear-resistant effect of the sealing element can be improved, and the service life of the sealing element is ensured.

The invention is further configured to: the sealing element is arranged on the sealing groove, and one end of the sealing element, which is far away from the sealing groove, extends out of the sealing groove;

one end of the sealing element extending out of the sealing groove is abutted against the rotating shaft and is in rotating fit with the rotating shaft; a first sealing part is formed at one end of the sealing element, which extends out of the sealing groove, the section of the first sealing part is semicircular, and the sealing element is in sealing fit with the rotating shaft through the first sealing part;

an arc-shaped bearing part is formed at one end of the sealing element, which is abutted against the bottom of the sealing groove, an axial surface contact part is formed in the middle of the arc-shaped bearing part, and a floating gap is formed between the axial surface contact part and the bottom of the sealing groove.

The invention is further configured to: a plurality of positioning holes which are uniformly distributed according to the cylinders are arranged on the axial surface contact part of the sealing element, a plurality of limiting holes which are uniformly distributed according to the cylinders and correspond to the positioning holes one by one are arranged at the bottom of the sealing groove, and a buffering limiting part is arranged between the positioning holes and the limiting holes which are correspondingly arranged,

sealing extension parts which extend outwards and respectively abut against the side wall of the rotating shaft are integrally formed at two sides of one end of the first sealing part of the sealing element, the cross sections of the sealing extension parts are arc-shaped, the sealing extension parts at two sides of the sealing element are symmetrically arranged and are positioned on the same arc,

a sealing abutting part with a circular cross section is integrally formed at the tail end of the sealing extension part, the circle center of the circular cross section of the sealing abutting part is superposed with the arc where the sealing extension part is located, and the sealing extension part abuts against the side wall of the rotating shaft through the sealing abutting part at the tail end;

and support ribs with two ends respectively extending into the sealing extension parts at two sides of the sealing element are integrally formed in the sealing element; the cross section of the supporting rib is arc-shaped and extends into the sealing abutting part at the tail end of the sealing extension part respectively; the support rib is positioned in the middle of the sealing extension part, an arc hook-shaped support part is formed at the tail end of the support rib extending into the sealing abutting part, and the circle of the arc support part is inscribed in the circle of the arc support rib; the support ribs may be made of spring steel sheets or other metal materials with good elasticity.

And the middle part of the sealing extension part at two sides of the sealing element is provided with a sealing tooth which extends towards the direction of the lower shaft sleeve and is propped against the lower shaft sleeve, under the condition that the sealing element does not float, the sealing tooth at one side can be propped against and extruded by the lower shaft sleeve, and the sealing tooth at the other side is prevented from being clung to the lower shaft sleeve.

The invention is further configured to: the buffering limiting part comprises

The limiting buffer cap is arranged at the bottom of the limiting hole, the outer wall of one end, abutted against the bottom of the limiting hole, of the limiting buffer cap is of a conical surface multi-section structure, and the bottom of the limiting buffer cap is a plane, so that the stress balance of the limiting buffer cap can be ensured;

the positioning sleeve is inserted on the limiting buffer cap, one end of the positioning sleeve is higher than the limiting buffer cap and extends out of the limiting hole and is inserted into the positioning hole,

the buffer support head is sleeved at one end of the positioning sleeve extending out of the limiting hole, a closed part is formed at one end of the buffer support head far away from the positioning sleeve, and the closed part abuts against the bottom of the positioning hole;

the positioning rod is arranged in the limiting buffer cap, penetrates through the positioning sleeve and the buffer supporting head and penetrates out of the closed part of the buffer supporting head, a positioning block is integrally formed in the middle of the positioning rod,

the buffer sleeve is sleeved on the positioning rod and positioned at one side of the positioning block close to the buffer supporting head, and the buffer sleeve is abutted against the positioning block,

and the limiting buffer spring is sleeved on the positioning rod, and two ends of the limiting buffer spring are abutted between the buffer support head and the buffer sleeve. The limiting buffer spring is subjected to certain compression force under the condition that the sealing element does not float, so that the sealing element can be ensured to be arranged on the side wall of the rotating shaft, but the compression force cannot clamp the sealing element on the rotating shaft.

The invention is further configured to: the buffer sleeve and the positioning sleeve are in sliding connection with each other, the positioning sleeve and the buffer supporting head are in sliding connection with each other, and a buffer gap is formed between the positioning sleeve and the bottom of the buffer supporting head under the action of the limiting supporting spring;

the positioning rod is positioned at one end in the limiting buffer cap, an enlarged contact part is formed, one end, penetrating out of the buffer support head, of the positioning rod is connected with the sealing part in a sliding mode, the positioning rod penetrates out of the sealing part and is inserted into the bottom of the positioning hole of the sealing part, a bearing hole in sliding fit with the positioning rod is formed in the bottom of the positioning hole, and the depth of the bearing hole is larger than the height of the positioning rod extending out of the buffer support cap.

The invention is further configured to: a sealing matching part is formed on the end face of the first sealing part, and a sealing contact part matched with the sealing matching part is formed on the rotating shaft;

the sealing matching part adopts a stepped structure with the height of the middle part gradually reduced at two sides, and comprises a sealing top part and sealing step parts formed at two sides of the sealing top part, and the height of the sealing top part is equal to the height of each step in the sealing step parts;

the sealing contact part is matched with the sealing matching part and is of a stepped structure with two sides of the middle bottom gradually increased; and the step height of the seal stepped portion is equal to the step height of the stepped structure in the seal contact portion.

The invention is further configured to: a contact fin is arranged on each stepped surface of the sealing top part and the sealing step part of the sealing matching part respectively, and the contact fin abuts against the stepped surface of the stepped structure of the sealing contact part on the rotating shaft;

the number of the steps of the sealing step part is 1-4, and the ratio of the vertical height of the contact fin to the height of the steps of the stepped structure in the sealing contact part is 1.2-1.5; the ratio of the height of the contact fins to the thickness of the contact fins is 1.3-1.8;

the joint of the sealing top and the sealing step part or the joint of the adjacent steps on the sealing step part and the step joint of the step structure on the matched sealing contact part are not on the same plane, so that an axial displacement gap is formed;

a first cambered surface connecting part is formed at the connecting part of each step in the stepped structure of the sealing contact part;

and the contact fins can be, but are not limited to, inclined fins or vertical fin structures.

The invention is further configured to: a contact cambered surface part is formed on the end surface of each contact fin, the contact fins are abutted against the sealing contact part through the contact cambered surface parts, reinforcing ribs are integrally formed in the first sealing part, the reinforcing ribs are coaxially arranged with the rotating shaft, extending ribs extending towards each contact fin are formed on one side of each reinforcing rib close to the rotating shaft,

the side wall of the rotating shaft is provided with a concave sealing section which is in sealing contact with the sealing element, the sealing section comprises a middle bearing section and arc-shaped sealing sections arranged on two sides of the middle bearing section, and the middle bearing section and the side wall of the rotating shaft are coaxially arranged;

the sealing contact part is abutted against the arc-shaped sealing section, and the cross section of the sealing contact part is positioned in the circle in which the arc-shaped sealing section is positioned;

the sealing contact part is formed in the middle of the intermediate bearing section;

and a disassembly cover plate fixed by bolts is arranged on one side of the sealing support edge close to the rotor body, and the sealing groove is formed between the sealing support edge and the disassembly cover plate.

The invention is further configured to: also comprises

The controller is arranged on one side of the motor, the motor is electrically connected with the controller, the controller controls the operation of the motor,

the floating ball is fixedly arranged on the outer side of one side of the motor with the controller, and can be used as a floating water pump for large-flow irrigation and drainage by being arranged; if the motor shaft faces upwards, the oxygenation impeller can be used as an oxygenation pump after being replaced, the floating ball can be used as a submersible pump after being taken off, the iron impeller with the iron pump head can be used as a large-flow sewage pump after being replaced, and the axial-flow impeller can be used for urban drainage.

The photoelectric alarm is fixedly arranged on the floating ball and is electrically connected with the controller;

a bearing cavity is formed between the lower shaft sleeve on one side of the sealing support edge close to the rotor body and the stop component, a sensor is arranged in the bearing cavity, the sensing sensor can be a humidity sensor or a water immersion sensor, and the sensor is electrically connected with the controller and used for detecting whether water exists in the lower shaft sleeve or not; when the sensor is a humidity sensor, a controller is provided with a humidity value for judging that water is in the lower shaft sleeve, when the humidity value is reached, the water is judged to be in the lower shaft sleeve, and the humidity sensor is a sensor capable of working for 24 hours under the condition of 100% humidity, so that the humidity sensor is prevented from being damaged by soaking; if the water sensor is a water immersion sensor, the water contacts the water sensor to trigger the water sensor, and the controller judges that water exists in the lower shaft sleeve; the method for controlling the motor to run by the controller comprises the following steps:

step S1, the controller is powered on, and the step S2 is carried out after the delay of h1 time;

step S2, detecting whether water exists in the lower shaft sleeve or not through a sensor, if not, entering step S6, and if so, entering step S3;

step S4, determining the time for the sensor to detect the existence of water in the lower shaft sleeve through the controller, and entering step S5 when the duration time is longer than h2, and entering step S6 when the duration time is shorter than h 2;

step S5, when the sensor detects that the time of the water in the lower shaft sleeve is longer than h2, the controller controls the photoelectric alarm to give an alarm;

step S6, when the time that the sensor detects that water exists in the lower shaft sleeve is less than h2 or the water exists in the lower barrel is not detected, the controller controls the motor to start, and then the step S7 is carried out;

step S7, the controller always detects whether water exists in the lower shaft sleeve through the sensor, if no water is detected, the controller always keeps the step S7, and if water exists in the lower shaft sleeve, the controller enters the step S8;

and step S8, the controller controls the motor to stop and controls the photoelectric alarm to alarm.

Compared with the prior art, the invention has the following advantages: the cooling water absorption impeller and the water outlet are communicated with the upper water inlet cavity, so that the flow speed of water in the motor can be ensured, and the cooling effect of the motor is ensured; the arranged sealing element can prevent water at the upper water inlet cavity side from entering the lower shaft sleeve and then entering the rotor body, so that a good sealing effect of the rotor body is ensured; by the control mode, the water inlet in the lower shaft sleeve can respond and give an alarm in time, so that the motor can be stopped and maintained in time, and the damage to the motor can be reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is an enlarged view of a portion of FIG. 2 at II;

FIG. 4 is a schematic view of the seal of the present invention;

reference numbers in the drawings and corresponding part names: 1-pump body, 2-machine shell, 3-rotor body, 4-rotating shaft, 5-upper end cover, 6-lower end cover, 7-upper shaft sleeve, 8-lower shaft sleeve, 9-installation edge, 10-filtering baffle, 11-filtering silk cotton block, 12-limiting support edge, 13-cooling water-absorbing impeller, 14-sealing support edge, 15-sealing element, 16-filter element, 17-axial thrust assembly, 18-sealing groove, 19-limiting convex part, 20-limiting groove, 21-bearing circular corner part, 22-first sealing part, 23-axial surface contact part, 24-positioning hole, 25-limiting hole, 26-sealing extension part, 27-sealing contact part, 28-supporting rib, 29-supporting part, 30-limiting buffer cap, 31-a positioning sleeve, 32-a buffer supporting head, 33-a sealing part, 34-a positioning rod, 35-a positioning block, 36-a buffer sleeve, 37-a limiting buffer spring, 38-an enlarged contact part, 39-a reinforcing rib, 40-an extending rib, 41-a middle connection section, 42-an arc sealing section, 43-a controller, 44-a floating ball, 45-a photoelectric alarm, 46-a sensor, 47-a sealing tooth, 48-a sealing matching part, 48 a-a sealing top part, 48 b-a sealing step part, 49-a sealing contact part, 50-a contact fin, 51-a contact arc part and 52-a stator.

Detailed Description

Embodiments of the present invention are further described with reference to fig. 1 to 4.

A shielding type multipurpose submersible pump comprises a motor and a pump body 1, wherein the motor comprises a casing 2, a stator 52, a rotor body 3, a rotating shaft 4, an upper end cover 5 and a lower end cover 6, the upper end cover 5 and the lower end cover 6 are respectively arranged at two ends of the casing 2, the stator 52 and the rotor body 3 are arranged in the casing 2, and the rotating shaft 4 is fixedly arranged on the rotor body 3; an upper shaft sleeve 7 extends from the upper end cover 5 to the inside of the machine shell 2, a lower shaft sleeve 8 extends from the lower end cover 6 to the inside of the machine shell 2, a rotating shaft 4 penetrates through the upper shaft sleeve 7 and the lower shaft sleeve 8 and extends into the pump body 1, the rotor body 3 is positioned between the upper shaft sleeve 7 and the lower shaft sleeve 8, a stopping wear-resistant sheet which is abutted against the rotor body 3 is fixedly arranged on the rotating shaft 4 close to one side of the upper end cover 5, and the stopping wear-resistant sheet is not contacted with the upper shaft sleeve 7; the rotor body 3 comprises a rotor and a shielding sleeve, the shielding sleeve is cylindrical, one side of the shielding sleeve close to the upper end cover 5 is a closed end, a shaft hole for the rotating shaft 4 to penetrate through is formed in the closed end, and the stop wear-resistant sheet abuts against the outer side of the closed end of the shielding sleeve; the casing 2 is of an inner-outer double-layer structure, a shielding cavity is formed between the two layers of casings 2, the stator 52 is arranged in the shielding cavity, and resin is filled in the shielding cavity; the upper end cap 5 further comprises:

a mounting edge 9, the mounting edge 9 is integrally formed on the upper end cover 5 and extends towards the opposite direction of the machine shell 2,

a filtering baffle 10, the filtering baffle 10 is provided with a through hole and is fixedly arranged on the mounting edge 9,

a filter silk floss block 11, a filter chamber is formed between the mounting edge 9 and the filter baffle 10, the filter silk floss block 11 is arranged in the filter chamber,

a limit support edge 12 is integrally formed in the upper shaft sleeve 7 and on one side close to the outer end face of the upper end cover 5, a gap is formed between the rotating shaft 4 and the limit support edge 12, one end of the rotating shaft 4 extends out from one side of the limit support edge 12 close to the end face of the upper end cover 5,

the cooling water absorption impeller 13 is arranged at the end of the rotating shaft 4 close to one side of the limiting support edge 12;

an inner baffle plate, an upper shaft sleeve 7 and an upper end cover 5 are coaxially arranged, a water through hole communicated with the inside of the upper shaft sleeve 7 is arranged on the end surface of the upper end cover 5,

the lower end cap 6 further comprises a lower end cap,

a sealing support edge 14, wherein the sealing support edge 14 is integrally formed in the lower shaft sleeve 8 and one side of the lower shaft sleeve close to the direction of the rotor body 3, and the rotating shaft 4 is in clearance fit with the sealing support edge 14;

a sealing element 15 which is abutted against the side wall of the rotating shaft 4 is arranged on the lower shaft sleeve 8 at one side of the sealing support edge 14, which is far away from the rotor body 3, an excessive gap is formed between the shell 2 and the rotor body 3 at the inner side of the stator 52, a water outlet which is communicated with the interior of the shell 2 and the pump body 1 is arranged at the outer side of the lower shaft sleeve 8 of the lower end cover 6, and a filter element 16 is arranged on the water outlet; the middle part of the pump body 1 is provided with the pump impeller fixedly connected with the shaft, the both sides that the pump body 1 is located the pump impeller are formed with last intake antrum and lower intake antrum, the lateral wall one end of the pump body 1 is provided with the last inlet opening that communicates with last intake antrum, the one end that the motor was kept away from to the pump body 1 is formed with the lower inlet that communicates with lower intake antrum, and is provided with the delivery port in the middle part of the lateral wall of body, outlet and last intake antrum intercommunication.

When the submersible pump is put into water to operate, the cooling water absorption impeller 13 can rotate under the drive of the shaft, so that outside water passes through the filtering baffle 10 and then passes through the filtering chamber provided with the filter silk cotton block 11, then enters the upper shaft sleeve 7 through the gap between the rotating shaft 4 and the limiting support edge 12, then enters the gap between the stator 52 and the rotor body 3 through the gap between the upper shaft sleeve 7 and the stopping wear-resistant piece, and finally fills the water outlet of the lower end cover 6 to enter the upper water inlet cavity. The cooling water absorption impeller 13 and the water outlet are communicated with the upper water inlet cavity, so that the flow velocity of water in the motor can be ensured, and the cooling effect of the motor is ensured; the sealing element 15 can prevent water at the upper water inlet cavity side from entering the lower shaft sleeve 8 and then entering the rotor body 3, so that a good sealing effect of the rotor body 3 is ensured.

Example two

Further on the basis of the first embodiment: the motor further comprises:

the axial thrust assembly 17 is abutted against one end of the shielding sleeve belt opening of the rotor body 3, and a graphite thrust sheet, an alloy friction sheet and a universal fine-tuning friction sheet seat are sequentially arranged between the rotor body 3 and the lower shaft sleeve 8 from the rotor body 3 to the lower shaft sleeve 8, and a sealing limit edge abutted against the cooling water absorption impeller 13 is formed on the end surface of the lower shaft sleeve 8;

a sealing groove 18 is arranged on the lower shaft sleeve 8 at one side of the sealing support edge 14 far away from the rotor body 3, and the sealing element 15 is arranged on the sealing groove 18;

limiting convex parts 19 are arranged on two side walls of the sealing groove 18,

the two sides of the sealing element 15 are provided with limiting grooves 20 which are abutted against the limiting convex part 19 and are in sliding fit, and the sealing property of the connection between the sealing element 15 and the sealing groove 18 can be ensured by the abutment of the limiting grooves 20 and the limiting concave part;

the cross section of the limiting groove 20 is rectangular, the limiting convex part 19 is an isosceles trapezoid formed by sequentially connecting a first contact part, a middle contact part and a second contact part, the middle contact part abuts against the bottom of the limiting groove 20, and a bearing fillet part 21 is respectively arranged at the joint of the first contact part and the middle contact part and the joint of the second contact part and the middle contact part;

the height of the isosceles trapezoid-shaped limiting convex part 19 is H1, the length of the lower bottom is L1, the depth of the limiting groove 20 is H2, the width of the limiting groove is L2, H1 is more than H2, and L2 is more than L1. The rotating shaft 4 of the motor is a ceramic-sprayed rotating shaft 4, and in order to reduce the abrasion of the sealing element 15, a layer of wear-resistant coating can be coated on the sealing element 15, so that the wear-resistant effect of the sealing element 15 can be improved, and the service life of the sealing element 15 is ensured.

The sealing groove 18 is used for fixing the sealing element 15, so that the mounting stability of the sealing element 15 is ensured, and the limiting grooves 20 on two sides of the sealing element 15 are matched with the limiting convex parts 19 on two sides of the sealing groove 18; since the height of the limit convex part 19 is H1, the length of the lower bottom is L1, the depth of the limit groove 20 is H2, the width is L2, H1 is more than H2, and L2 is more than L1, the sealing element 15 can displace and float on the sealing groove 18 in the radial direction, so that the sealing element 15 can be ensured to abut against the shaft when the rotating shaft 4 shakes, and the sealing effect between the sealing element 15 and the rotating shaft 4 is ensured.

EXAMPLE III

On the basis of the second embodiment: : the sealing element 15 is arranged on the sealing groove 18, and one end of the sealing element 15, which is far away from the sealing groove 18, extends out of the sealing groove 18;

one end of the sealing element 15 extending out of the sealing groove 18 is abutted against the rotating shaft 4 and is in rotating fit with the rotating shaft 4; a first sealing part 22 is formed at one end of the sealing element 15 extending out of the sealing groove 18, the section of the first sealing part 22 is semicircular, and the sealing element 15 is in sealing fit with the rotating shaft 4 through the first sealing part 22;

an arc surface bearing part is formed at one end of the sealing element 15, which is abutted against the bottom of the sealing groove 18, an axial surface contact part 23 is formed in the middle of the arc surface bearing part, and a floating gap is formed between the axial surface contact part 23 and the bottom of the sealing groove 18.

The sealing element 15 extends out of the sealing groove 18, so that the rotating shaft 4 can be prevented from abutting against the lower shaft sleeve 8 while the sealing element 15 can abut against the rotating shaft 4; the first sealing portion 22 formed along the sealing member 15 and having a semicircular cross section can reduce the wear of the sealing member 15 by engaging the arc surface with the axial surface of the side wall of the rotating shaft 4, thereby ensuring the service life of the sealing member 15. An arc-shaped bearing part is formed at one end of the sealing element 15, which is abutted against the bottom of the sealing groove 18, so that the friction force between the sealing element and the sealing groove 18 can be reduced through arc transition; an axial surface contact part 23 is formed in the middle of the arc-shaped bearing part, a floating gap is formed between the axial surface contact part 23 and the bottom of the sealing groove 18, and the floating gap provides a space for radial displacement of the sealing element 15, so that extrusion between the sealing element 15 and the sealing groove 18 during radial displacement is reduced.

Example four

Further on the basis of the third embodiment: a plurality of positioning holes 24 which are uniformly distributed according to the cylinder are arranged on the axial surface contact part 23 of the sealing element 15, a plurality of limiting holes 25 which are uniformly distributed according to the cylinder and are in one-to-one correspondence with the positioning holes 24 are arranged at the bottom of the sealing groove 18, and a buffering limiting part is arranged between the positioning holes 24 and the limiting holes 25 which are correspondingly arranged,

sealing extension parts 26 which extend outwards and respectively abut against the side wall of the rotating shaft 4 are integrally formed at two sides of one end, where the first sealing part 22 of the sealing element 15 is located, of the sealing extension parts 26, the cross sections of the sealing extension parts 26 are arc-shaped, the sealing extension parts 26 at two sides of the sealing element 15 are symmetrically arranged and are located on the same arc,

a sealing abutting part 27 with a circular cross section is integrally formed at the tail end of the sealing extension part 26, the circle center of the circular cross section of the sealing abutting part 27 is superposed with the arc where the sealing extension part 26 is located, and the sealing extension part 26 abuts against the side wall of the rotating shaft 4 through the sealing abutting part 27 at the tail end;

and the sealing element 15 is internally and integrally formed with a support rib 28 with two ends respectively extending into the sealing extension parts 26 at two sides of the sealing element 15; the cross section of the supporting rib 28 is arc-shaped and extends into the sealing interference part 27 at the end of the sealing extension part 26; the supporting rib 28 is positioned in the middle of the sealing extension part 26, an arc-shaped hook-shaped supporting part 29 is formed at the tail end of the supporting rib 28 extending into the sealing interference part 27, and the circle of the arc-shaped supporting part 29 is inscribed in the circle of the arc-shaped supporting rib 28; the support ribs 28 may be made of spring steel or other metal material with good elasticity.

And the middle part of the sealing extension part 26 at both sides of the sealing element 15 is formed with a sealing tooth 47 which extends towards the lower shaft sleeve 8 and is abutted against the lower shaft sleeve 8, under the condition that the sealing element 15 does not float, the sealing tooth 47 at one side is abutted against and pressed by the lower shaft sleeve 8, and the sealing tooth 47 at the other side is prevented from being abutted against the lower shaft sleeve 8.

The rotation of the sealing element 15 can be avoided by the matching of the buffering limiting piece with the positioning hole 24 and the limiting hole 25; sealing extension parts 26 which extend to the side walls of the rotating shaft 4 respectively are formed on two sides of the sealing part 15, and triple sealing is carried out on the rotating shaft 4 through the sealing extension parts 26 and the first sealing part 22, so that good sealing performance between the sealing part 15 and the rotating shaft 4 is ensured; the sealing contact part 49 which is arranged at the tail end of the sealing extension part 26 and is abutted against the side wall of the rotating shaft 4 is contacted with the shaft surface of the side wall of the rotating shaft 4 through the cambered surface, so that the abrasion of the sealing contact part 49 can be reduced while the sealing effect is ensured; the support ribs 28 provided in the sealing member 15 can provide good support for the sealing extension 26, thereby preventing the sealing extension 26 from being deformed, and the support portions 29 provided at the ends of the support ribs 28 can provide good support and reinforcement for the sealing contact portion 49 when the sealing contact portion is stressed. The circle of the arc-shaped supporting part 29 is inscribed in the circle of the arc-shaped supporting rib 28, so that a good supporting effect of the supporting part 29 can be ensured; the center of the circular cross section of the seal abutting portion 27 coincides with the arc of the seal extending portion 26, so that the stability of the connection between the seal extending portion 26 and the seal contact portion 49 can be ensured. And under the condition that the sealing member 15 does not float, the sealing teeth 47 on one side of the sealing member can be abutted against and extruded by the lower shaft sleeve 8, and the sealing teeth 47 on the other side of the sealing member are prevented from being attached to the lower shaft sleeve 8, so that the sealing teeth 47 on one side of the sealing member are always ensured to be in sealing fit with the lower shaft sleeve 8 under the condition that the sealing member 15 floats, and the sealing property of connection between the sealing member 15 and the shaft sleeves is ensured.

EXAMPLE five

Further on the basis of example four: the buffering limiting part comprises

The limiting buffer cap 30 is arranged at the bottom of the limiting hole 25, the outer wall of one end, abutted against the bottom of the limiting hole 25, of the limiting buffer cap 30 is of a conical surface multi-section structure, and the bottom is a plane, so that the stress balance of the limiting buffer cap 30 can be ensured;

the positioning sleeve 31 is inserted on the limiting buffer cap 30, one end of the positioning sleeve 31 is higher than the limiting buffer cap 30 and extends out of the limiting hole 25 and is inserted into the positioning hole 24,

the buffer support head 32 is sleeved at one end of the positioning sleeve 31 extending out of the limiting hole 25, a closed part 33 is formed at one end of the buffer support head 32 far away from the positioning sleeve 31, and the closed part 33 abuts against the bottom of the positioning hole 24;

a positioning rod 34, wherein the positioning rod 34 is arranged in the limit buffer cap 30, penetrates through the positioning sleeve 31 and the buffer support head 32 and penetrates out of the sealing part 33 of the buffer support head 32, a positioning block 35 is integrally formed in the middle of the positioning rod 34,

the buffer sleeve 36 is sleeved on the positioning rod 34 and is positioned on one side of the positioning block 35 close to the buffer supporting head 32, the buffer sleeve 36 is abutted against the positioning block 35,

and the limiting buffer spring 37 is sleeved on the positioning rod 34, and two ends of the limiting buffer spring 37 are abutted between the buffer support head 32 and the buffer sleeve 36. The limit buffer spring 37 is subjected to a certain compressive force without floating the sealing member 15, so as to ensure that the sealing member 15 can be placed on the side wall of the rotating shaft 4, but the compressive force does not clamp the sealing member 15 on the rotating shaft 4.

Good supporting effect is played to buffering sleeve 36 through the location on the bracing piece, and buffering sleeve 36 and buffering support head 32 can play good elastic buffering's effect under spacing buffering spring 37's effect to make a buffering support section of thick bamboo can slide relative positioning sleeve 31, thereby make elastic radial ascending removal appear in sealing member 15, and then ensure that sealing member 15 can firmly get the laminating with pivot 4. Wherein spacing buffering cap can be made by cushion rubber or plastics etc. and buffering support head, locating lever, buffering sleeve and locating sleeve can be made by the aluminum alloy.

EXAMPLE six

Further on the basis of example five: the buffer sleeve 36 and the positioning sleeve 31 are in sliding connection, the positioning sleeve 31 and the buffer supporting head 32 are in sliding connection, and a buffer gap is formed between the positioning sleeve 31 and the bottom of the buffer supporting head 32 under the action of the limit supporting spring;

an enlarged contact part 38 is formed at one end of the positioning rod 34 positioned in the limiting buffer cap 30, one end of the positioning rod 34 penetrating through the buffer support head 32 is connected with the sealing part 33 in a sliding manner, the positioning rod 34 penetrates through the sealing part 33 and is inserted into the bottom of the positioning hole 24 of the sealing part 15, a bearing hole in sliding fit with the positioning rod 34 is formed at the bottom of the positioning hole 24, and the depth of the bearing hole is greater than the height of the positioning rod 34 extending out of the buffer support cap.

The buffer gap can provide a displacement space for the buffer support head 32 under the condition that the sealing element 15 floats, and the arrangement of the enlarged contact part 38 can increase the contact area between the positioning rod 34 and the limit buffer cap 30 when the positioning rod 34 is stressed, so that the situation that the positioning rod 34 breaks through the limit buffer cap 30 can be reduced; the arrangement of the bearing holes can improve the floating space of the sealing element 15 and prevent the positioning rod 34 from breaking through the sealing element 15.

EXAMPLE seven

Further on the basis of example six: a seal engaging portion 48 is formed on an end surface of the first seal portion 22, and a seal contact portion 49 engaging with the seal engaging portion 48 is formed on the rotary shaft 4;

the sealing matching part 48 adopts a step-shaped structure with the height of the middle part gradually reduced at two sides, and comprises a sealing top part 48a and sealing step parts 48b formed at two sides of the sealing top part 48a, and the height of the sealing top is equal to the height of each step in the sealing step parts 48 b;

the sealing contact part 49 is matched with the sealing matching part 48 and is in a stepped structure with two sides of the middle bottom gradually increased; and the step height of the seal stepped portion 48b is equal to the step height of the stepped structure in the seal contact portion 49.

The sealing matching part 48 adopts a stepped structure with the height of the middle part gradually reduced on two sides, the sealing top part 48a and the sealing stepped part 48b in the sealing matching part 48 are in contact with the sealing contact part 49, so that the multi-section sealing effect is realized, and the step height of the sealing stepped part is greater than or equal to that of the stepped structure in the sealing contact part 49, so that the sealing performance of matching the step surface of the sealing stepped part with the step surface of the stepped structure in the sealing contact part 49 can be ensured.

Example eight

Further on the basis of example seven: a contact fin 50 is respectively arranged on each stepped surface of the seal top part 48a and the seal stepped part 48b of the seal matching part 48, and the contact fin 50 abuts against the stepped surface of the stepped structure of the seal contact part 49 on the rotating shaft 4;

the number of the steps of the seal stepped portion 48b is 1 to 4, and the ratio of the vertical height of the contact fin 50 to the step height of the stepped structure in the seal contact portion 49 is 1.2 to 1.5; the ratio of the height of the contact fins 50 to the thickness of the contact fins 50 is 1.3 to 1.8;

the joint of the sealing top part 48a and the sealing step part 48b or the joint of the adjacent steps on the sealing step part 48b and the step joint of the step-shaped structure on the matched sealing contact part 49 are not on the same plane, so that an axial displacement gap is formed;

a first cambered surface connecting part is formed at the joint of each step in the stepped structure of the sealing contact part 49;

and the contact fins 50 may be, but are not limited to, angled fins or vertical fins.

Since the contact fin 50 is provided on each stepped surface of the seal top portion 48a and the seal stepped portion 48b of the seal engaging portion 48, and the seal engaging portion 48 is in contact with the stepped surface of the seal contact portion 49 via the contact fin 50, the contact area between the seal engaging portion 48 and the seal contact portion 49 can be reduced, and the wear can be reduced; the joint of the sealing top part 48a and the sealing step part 48b or the joint of the adjacent steps on the sealing step part 48b and the step joint of the step structure on the matched sealing contact part 49 are not on the same plane, so that an axial displacement gap is formed, and the sealing effect between the sealing member 15 and the rotating shaft 4 can be ensured when the rotating shaft 4 is slightly axially offset; the contact fins 50 may be, but are not limited to, a tilted fin or a vertical fin structure; the number of steps of the seal stepped portion 48b is 1 to 4, so that the sealing effect of the seal stepped portion 48b can be ensured; the ratio of the height of the contact fin 50 to the thickness of the contact fin 50 is 1.3 to 1.8, so that the structural strength of the contact fin 50 can be secured.

Example nine

Further on the basis of example eight: a contact arc surface part 51 is formed on the end surface of each contact fin 50, the contact fin 50 is abutted against the seal contact part 49 through the contact arc surface part 51, a reinforcing rib 39 is integrally formed in the first seal part 22, the reinforcing rib 39 is coaxially arranged with the rotating shaft 4, an extending rib 40 extending into each contact fin 50 is formed on one side of the reinforcing rib 39 close to the rotating shaft 4,

a concave sealing section which is in sealing contact with the sealing element 15 is formed on the side wall of the rotating shaft 4, the sealing section comprises a middle bearing section 41 and arc-shaped sealing sections 42 arranged at two sides of the middle bearing section 41, and the middle bearing section 41 and the side wall of the rotating shaft 4 are coaxially arranged;

the sealing interference part 27 is abutted against the arc-shaped sealing section 42, and the cross section of the sealing contact part 49 is in the circle in which the arc-shaped sealing section 42 is located;

the seal contact portion 49 is formed in the middle of the intermediate receiving section 41;

and a detachable cover plate fixed by bolts is arranged on one side of the sealing support edge 14 close to the rotor body 3, and the sealing groove 18 is formed between the sealing support edge 14 and the detachable cover plate.

The contact cambered surface part 51 is formed on the end surface of the contact fin 50, the cambered surface is in contact with the seal contact part 49, the contact area is reduced, the seal effect is ensured, the probability of deformation of the contact fin 50 can be reduced due to the matching of the arranged reinforcing ribs 39 and the extending ribs 40, and the structural strength of the contact fin 50 is improved; the side wall of the rotating shaft 4 is provided with an arc-shaped sealing part, and the arc-shaped sealing part is matched with the sealing abutting part 27, so that sealing can be ensured, and abrasion can be reduced; the seal support edge 14 is provided with a detachable cover plate fixed by bolts at one side close to the rotor body 3, and the seal groove 18 is formed between the seal support edge 14 and the detachable cover plate, so that the installation of the sealing element 15, the processing of the limit convex part 19 and the like can be facilitated.

Example ten

Further on the basis of example nine: also comprises

A controller 43, wherein the controller 43 is arranged at one side of the motor, the motor is electrically connected with the controller 43, the controller 43 controls the operation of the motor,

the floating ball 44 is fixedly arranged on the outer side of one side of the motor with the controller 43, and the floating ball 44 can be used as a floating water pump for large-flow irrigation and drainage; if the motor shaft faces upwards, the oxygen increasing impeller can be used as an oxygen increasing pump when being replaced, the floating ball 44 can be used as a submersible pump when being taken off, the iron impeller of the iron pump head can be used as a large-flow sewage pump when being replaced, and the axial-flow impeller can be used for urban drainage.

The photoelectric alarm 45 is fixedly arranged on the floating ball 44, and is electrically connected with the controller 43;

a bearing cavity is formed between the lower shaft sleeve 8 at one side of the sealing support edge 14 close to the rotor body 3 and the stop component, a sensor 46 is arranged in the bearing cavity, the sensor 46 can be a humidity sensor 46 or a water sensor 46, and the sensor 46 is electrically connected with the controller 43 and is used for detecting whether water exists in the lower shaft sleeve 8; when the sensor 46 is a humidity sensor 46, a humidity value for judging that water exists in the lower shaft sleeve 8 is set in the controller 43, when the humidity value is reached, the water exists in the lower shaft sleeve 8, and the humidity sensor 46 can be a sensor 46 which can work for 24 hours under the condition that the humidity is 100%, so that the humidity sensor 46 is prevented from being damaged by soaking; if the water sensor 46 is in the water immersion state, the controller 43 judges that water exists in the lower shaft sleeve 8 when the water contacts the water sensor 46 to trigger the water sensor; the method in which the controller 43 controls the operation of the motor includes the steps of:

step S1, the controller 43 is powered on, and after a delay of h1, the process proceeds to step S2;

step S2, detecting whether water exists in the lower shaft sleeve 8 through the sensor 46, if not, entering step S6, and if so, entering step S3;

step S4, determining the time for which the sensor 46 detects the presence of water in the lower bushing 8 by the controller 43, and proceeding to step S5 when the duration is greater than h2 and proceeding to step S6 when the duration is less than h 2;

step S5, when the sensor 46 detects that the time for which the water exists in the lower shaft sleeve 8 is longer than h2, the controller 43 controls the photoelectric alarm 45 to give an alarm;

step S6, when the time that the sensor 46 detects that water exists in the lower bushing 8 is less than h2 or water does not exist in the lower cylinder, the controller 43 controls the motor to start, and then the process goes to step S7;

step S7, the controller 43 always detects whether water is in the lower bushing 8 through the sensor 46, and if water is not detected, the controller keeps the step S7, and if water is detected in the lower bushing 8, the controller proceeds to step S8;

in step S8, the controller 43 controls the motor to stop and controls the photoelectric alarm 45 to alarm.

Through adopting foretell technical scheme, through above-mentioned control mode, can in time respond to and report to the police when lower axle sleeve 8 internal water to in time stop the work of motor and maintain, thereby can reduce the damage to the motor.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A shielding type multipurpose submersible pump comprises a motor and a pump body (1), wherein the motor comprises a casing (2), a stator (52), a rotor body (3), a rotating shaft (4), an upper end cover (5) and a lower end cover (6), the upper end cover (5) and the lower end cover (6) are respectively arranged at two ends of the casing (2), the stator (52) and the rotor body (3) are arranged in the casing (2), and the rotating shaft (4) is fixedly arranged on the rotor body (3); the pump is characterized in that an upper shaft sleeve (7) extends from an upper end cover (5) to the inside of a machine shell (2), a lower shaft sleeve (8) extends from a lower end cover (6) to the inside of the machine shell (2), a rotating shaft (4) penetrates through the upper shaft sleeve (7) and the lower shaft sleeve (8) and extends into a pump body (1), a rotor body (3) is positioned between the upper shaft sleeve (7) and the lower shaft sleeve (8), and a stop wear-resistant sheet which is abutted against the rotor body (3) is arranged on the rotating shaft (4) on one side close to the upper end cover (5); the upper end cover (5) further comprises:

a mounting edge (9), the mounting edge (9) is integrally formed on the upper end cover (5) and extends towards the opposite direction of the machine shell (2),

a filtering baffle (10), the filtering baffle (10) is fixedly arranged on the mounting edge (9),

a filtering silk floss block (11), a filtering chamber is formed between the mounting edge (9) and the filtering baffle (10), the filtering silk floss block (11) is arranged in the filtering chamber,

a limit support edge (12), the limit support edge (12) is integrally formed in the upper shaft sleeve (7) and one side close to the outer end face of the upper end cover (5), a gap is formed between the rotating shaft (4) and the limit support edge (12), one end of the rotating shaft (4) extends out from one side of the limit support edge (12) close to the end face of the upper end cover (5),

the cooling water absorption impeller (13), the cooling water absorption impeller (13) is arranged at the end of the rotating shaft (4) close to one side of the limiting support edge (12);

the lower end cover (6) also comprises,

the sealing support edge (14) is integrally formed in one side of the lower shaft sleeve (8) close to the direction of the rotor body, and the rotating shaft (4) is in clearance fit with the sealing support edge (14);

and a sealing element (15) which is abutted against the side wall of the rotating shaft (4) is arranged on a lower shaft sleeve (8) on one side of the sealing support edge (14) far away from the rotor body, an over-leaving gap is formed between the stator (52) and the rotor body (3), a water outlet which is communicated with the interior of the machine shell (2) and the pump body (1) is arranged on the outer side of the lower end cover (6) which is positioned on the lower shaft sleeve (8), and a filter element (16) is arranged on the water outlet.

2. The shielded utility submersible pump of claim 1, wherein the motor further comprises:

the axial thrust assembly (17), the axial thrust assembly (17) is abutted between the rotor body (3) and the lower shaft sleeve (8);

a sealing groove (18) is formed in the lower shaft sleeve (8) on one side, far away from the rotor body (3), of the sealing support edge (14), and the sealing element (15) is arranged on the sealing groove (18);

two side walls of the sealing groove (18) are provided with limit convex parts (19),

the two sides of the sealing element (15) are provided with limit grooves (20) which are in sliding fit with the limit convex parts (19),

the cross section of the limiting groove (20) is rectangular, the limiting convex part (19) is an isosceles trapezoid formed by sequentially connecting a first contact part, a middle contact part and a second contact part, the middle contact part abuts against the bottom of the limiting groove (20), and a bearing fillet part (21) is respectively arranged at the joint of the first contact part and the middle contact part and the joint of the second contact part and the middle contact part;

the height of the isosceles trapezoid-shaped limiting convex part (19) is H1, the length of the lower bottom is L1, the depth of the limiting groove (20) is H2, the width of the limiting groove is L2, H1 is more than H2, and L2 is more than L1.

3. The shielding type multipurpose submersible pump according to claim 2, wherein the sealing element (15) is arranged on the sealing groove (18), and one end of the sealing element (15) far away from the sealing groove (18) extends out of the sealing groove (18);

one end of the sealing element (15) extending out of the sealing groove (18) is abutted against the rotating shaft (4) and is in rotating fit with the rotating shaft (4); a first sealing part (22) is formed at one end of the sealing element (15) extending out of the sealing groove (18), the section of the first sealing part (22) is semicircular, and the sealing element (15) is in sealing fit with the rotating shaft (4) through the first sealing part (22);

an arc surface bearing part is formed at one end, abutted against the bottom of the sealing part (15), of the sealing groove (18), an axial surface contact part (23) is formed in the middle of the arc surface bearing part, and a floating gap is formed between the axial surface contact part (23) and the bottom of the sealing groove (18).

4. The shielding type multipurpose submersible pump according to claim 3, wherein a plurality of positioning holes (24) are uniformly distributed according to a cylinder on the axial surface contact part (23) of the sealing member (15), a plurality of limiting holes (25) are uniformly distributed according to a cylinder and are in one-to-one correspondence with the positioning holes (24) and are arranged at the bottom of the sealing groove (18), and a buffering limiting part is arranged between the positioning holes (24) and the limiting holes (25),

sealing extension parts (26) which extend outwards and respectively abut against the side wall of the rotating shaft (4) are integrally formed at two sides of one end where the first sealing part (22) of the sealing element (15) is positioned, the cross sections of the sealing extension parts (26) are arc-shaped, the sealing extension parts (26) at two sides of the sealing element (15) are symmetrically arranged and are positioned on the same arc,

a sealing interference part (27) with a circular cross section is integrally formed at the tail end of the sealing extension part (26), the circle center of the circular cross section of the sealing interference part (27) is superposed with the arc where the sealing extension part (26) is located, and the sealing extension part (26) is abutted against the side wall of the rotating shaft (4) through the sealing interference part (27) at the tail end;

and a supporting rib (28) with two ends respectively extending into the sealing extension parts (26) at two sides of the sealing element (15) is integrally formed in the sealing element (15); the cross section of the support rib (28) is arc-shaped and extends into the sealing interference part (27) at the tail end of the sealing extension part (26) respectively; the support rib (28) is positioned in the middle of the sealing extension part (26), an arc hook-shaped support part (29) is formed at the tail end of the support rib (28) extending into the sealing interference part (27), and the circle of the arc support part (29) is inscribed in the circle of the arc support rib (28);

and sealing teeth (47) which extend towards the direction of the lower shaft sleeve (8) and are abutted against the lower shaft sleeve are formed in the middle of the sealing extension parts (26) at two sides of the sealing element (15).

5. The shielded multipurpose submersible pump of claim 4, wherein the buffer stop comprises

A limit buffer cap (30), the limit buffer cap (30) is arranged at the bottom of the limit hole (25),

the positioning sleeve (31) is inserted on the limiting buffer cap (30), one end of the positioning sleeve (31) is higher than the limiting buffer cap (30) and extends out of the limiting hole (25) and is inserted into the positioning hole (24),

the buffer support head (32) is sleeved at one end of the positioning sleeve (31) extending out of the limiting hole (25), a closed part (33) is formed at one end, far away from the positioning sleeve (31), of the buffer support head (32), and the closed part (33) abuts against the bottom of the positioning hole (24);

the positioning rod (34) is arranged in the limiting buffer cap (30), penetrates through the positioning sleeve (31) and the buffer supporting head (32) and penetrates out of the sealing part (33) of the buffer supporting head (32), a positioning block (35) is integrally formed in the middle of the positioning rod (34),

the buffer sleeve (36) is sleeved on the positioning rod (34) and is positioned on one side of the positioning block (35) close to the buffer supporting head (32), the buffer sleeve (36) is abutted against the positioning block (35),

the limiting buffer spring (37), the limiting buffer spring (37) is sleeved on the positioning rod (34), and two ends of the limiting buffer spring (37) are abutted between the buffer support head (32) and the buffer sleeve (36).

6. The shielding type multipurpose submersible pump according to claim 5, wherein the buffering sleeve (36) is slidably connected with the positioning sleeve (31), the positioning sleeve (31) is slidably connected with the buffering support head (32), and a buffering gap is formed between the positioning sleeve (31) and the bottom of the buffering support head (32) under the action of the limiting support spring;

the locating rod (34) is located one end of limiting buffer cap (30) and is formed with increase contact portion (38), the one end and the closing part (33) sliding connection of buffer support head (32) are worn out to locating rod (34), and locating rod (34) wear out closing part (33) and insert locating hole (24) bottom of sealing member (15), the bottom of locating hole (24) is formed with and receives hole (35) with locating rod (34) sliding fit, the degree of depth of receiving hole (35) be greater than the height that locating rod (34) extended the buffer support cap.

7. The shielded multipurpose submersible pump according to claim 6, wherein a seal fitting portion (48) is formed at an end surface of the first seal portion (22), and a seal contact portion (49) fitted to the seal fitting portion (48) is formed at the rotary shaft (4);

the sealing matching part (48) adopts a step-shaped structure with the height of the middle part gradually reduced at two sides, and comprises a sealing top part (48a) and sealing step parts (48b) formed at two sides of the sealing top part (48a), and the height of the sealing top is equal to the height of each step in the sealing step parts (48 b);

the sealing contact part (49) is matched with the sealing matching part (48) and is of a stepped structure with two sides of the middle bottom gradually increasing; and the step height of the seal stepped portion (48b) is equal to the step height of the stepped structure in the seal contact portion (49).

8. The shielding type multipurpose submersible pump according to claim 7, wherein a contact fin (50) is respectively arranged on each stepped surface of the sealing top part (48a) and the sealing step part (48b) of the sealing matching part (48), and the contact fin (50) abuts against the stepped surface of the stepped structure of the sealing contact part (49) on the rotating shaft (4);

the number of the steps of the sealing step part (48b) is 1 to 4, and the ratio of the vertical height of the contact fin (50) to the height of the step structure in the sealing contact part (49) is 1.2 to 1.5; the ratio of the height of the contact fins (50) to the thickness of the contact fins (50) is 1.3-1.8;

the joint of the sealing top part (48a) and the sealing step part (48b) or the joint of the adjacent steps on the sealing step part (48b) and the step joint of the stepped structure on the matched sealing contact part (49) are not on the same plane, so that an axial displacement gap is formed;

a first cambered surface connecting part is formed at the joint of each step in the stepped structure of the sealing contact part (49);

and the contact fins (50) may be, but are not limited to, a ramped fin or a ramped fin configuration.

9. The shielding type multipurpose submersible pump according to claim 8, wherein a contact cambered surface portion (51) is formed on an end surface of each contact fin (50), the contact fins (50) abut against the sealing contact portion (49) through the contact cambered surface portions (51), a reinforcing rib (39) is integrally formed in the first sealing portion (22), the reinforcing rib (39) is coaxially arranged with the rotating shaft (4), and an extending rib (40) extending into each contact fin (50) is formed on one side of the reinforcing rib (39) close to the rotating shaft (4),

a concave sealing section which is in sealing contact with the sealing element (15) is formed on the side wall of the rotating shaft (4), the sealing section comprises a middle bearing section (41) and arc-shaped sealing sections (42) arranged on two sides of the middle bearing section (41), and the middle bearing section (41) and the side wall of the rotating shaft are coaxially arranged;

the sealing abutting part (27) abuts against the arc-shaped sealing section (42), and the cross section of the sealing contact part (49) is in the circle and is in the circle of the arc-shaped sealing section (42);

the sealing contact part (49) is formed in the middle of the intermediate bearing section (41);

and a disassembling cover plate (37) fixed by bolts is arranged on one side of the sealing support edge (14) close to the rotor body (3), and the sealing groove (18) is formed between the sealing support edge (14) and the disassembling cover plate (37).

10. The shielded multipurpose submersible pump of claim 9, further comprising

The controller (43), the controller (43) is arranged on one side of the motor, the motor is electrically connected with the controller (43), the controller (43) controls the operation of the motor,

a floating ball (44), the floating ball (44) is fixedly arranged at the outer side of one side of the motor belt controller (43),

the photoelectric alarm (45), the photoelectric alarm (45) is fixedly arranged on the floating ball (44) and is electrically connected with the controller (43),

a bearing cavity is formed between the lower shaft sleeve (8) on one side of the sealing support edge (14) close to the rotor body (3) and the stop component (17), a sensor (46) is arranged in the bearing cavity, and the sensor (46) is electrically connected with the controller (43) and used for detecting whether water exists in the lower shaft sleeve (8); the method for controlling the motor to run by the controller (43) comprises the following steps:

step S1, the controller (43) is powered on, and the step S2 is carried out after the delay of h 1;

step S2, detecting whether water exists in the lower shaft sleeve (8) through the sensor (46), if not, entering step S6, and if so, entering step S3;

step S4, determining the time for the sensor (46) to detect the existence of water in the lower shaft sleeve (8) through the controller (43), and entering step S5 when the duration is longer than h2 and entering step S6 when the duration is shorter than h 2;

step S5, when the sensor (46) detects that the time for which the water exists in the lower shaft sleeve (8) is longer than h2, the controller (43) controls the photoelectric alarm (45) to give an alarm;

step S6, when the time that the sensor (46) detects that water exists in the lower shaft sleeve (8) is less than h2 or the water exists in the lower cylinder body is not detected, the controller (43) controls the motor to start, and then the step S7 is carried out;

step S7, the controller (43) always detects whether water exists in the lower shaft sleeve (8) through the sensor (46), if no water is detected, the controller keeps the step S7, and if water exists in the lower shaft sleeve (8), the controller goes to step S8;

and step S8, the controller (43) controls the motor to stop and controls the photoelectric alarm (45) to alarm.