CN117614180A - Leakage self-checking high-voltage or ultra-high-voltage environment shielding motor - Google Patents

Abstract

The invention discloses a leakage self-checking high-voltage or ultra-high-voltage environment shielding motor, which comprises a stator, a rotor, a shielding sleeve, a leakage detecting sleeve, a pressure balancing diaphragm and a leakage detecting diaphragm; the shielding sleeve is a thin-wall cylinder with an outer circle inserted into an inner cavity of the leakage detection sleeve, the outer circle of the motor rotor is sleeved in the inner cavity in a clearance fit manner, and axial temperature compensation waves are arranged at the end, facing the rear cover of the motor, of the shielding sleeve; the leakage detecting sleeve is a thin-wall cylinder with an outer circle inserted into the inner cavity of the motor stator, the inner cavity is sleeved with the outer circle of the shielding sleeve, the leakage detecting sleeve facing the rear cover end of the motor is provided with axial temperature compensating waves matched with the shielding sleeve, and the leakage detecting sleeve is provided with a leakage liquid collecting groove protruding to the inner cavity of the motor stator along the axial direction; the pressure balance diaphragm is a circular diaphragm with annular corrugation; the leak detection diaphragm is a circular diaphragm with circumferential corrugation, which is matched with the pressure balance diaphragm; the pressure balance diaphragm and the leak detection diaphragm are mutually overlapped, and the circumferences of the two diaphragms are fixedly arranged on the circumference of the end face of the motor rear cover bearing seat, which faces the rear cover.

Description

Leakage self-checking high-voltage or ultra-high-voltage environment shielding motor

Technical Field

The invention relates to the field of shielding motors, in particular to a leakage self-checking high-voltage or ultra-high-voltage environment shielding motor.

Background

A canned motor is a motor used to drive pumps, compressors, stirred tanks or regulating valves that regulate the pressure and flow of toxic, corrosive, radioactive, flammable, explosive, valuable fluids that can cause significant harm after leakage. The motor stator and the rotor are isolated by the shielding sleeve, so that a shaft seal-free structure between the transmission shaft and the bearing of the mechanical part for driving, conveying, stirring or regulating the fluid is realized, the bearing seat or the bearing assembly adopts static seal with the outside, the safety and the reliability are improved, and the leakage of the fluid and the pollution to the environment are prevented. In addition, as the pressure of the fluid to be conveyed, stirred or regulated increases, the thickness of the shielding sleeve of the shielding motor in the conventional method becomes thicker, the efficiency of the motor is seriously reduced for high-pressure or ultra-high-pressure fluid, and if the strength of the shielding sleeve is insufficient, once the leakage occurs, the shielding sleeve can cause serious damage.

The patent office of the intellectual property office of China, which is authorized in the year 6 and 16 of 2010, the patent of the invention with the publication number of CN101359849B and the name of high-voltage and ultra-high-voltage medium environment shielding motor, provides a structure for generating balanced pressure on the inner side and the outer side of a shielding sleeve without generating obvious stress on the shielding sleeve, and provides preconditions for combined creation of a high-voltage or ultra-high-voltage shielding pump, a compressor, a stirring kettle and a regulating valve; however, in the technology of the patent, the sealing is unreliable due to the fact that the O-shaped ring is adopted to seal between the shielding sleeve or the pressure balance diaphragm and the bearing seat or the bearing assembly; the problem of expansion and shrinkage of the inert liquid volume is not considered in the structure of the shielding sleeve and the pressure balance diaphragm, so that the shielding sleeve and the pressure balance diaphragm are easy to damage due to thermal stress; the motor stator lead wire is difficult to connect, and is inconvenient to install and maintain, so that the implementation of the technology in combination creation of a high-pressure ultrahigh-pressure shielding pump, a compressor, a stirring kettle and a regulating valve is restricted.

The patent office of China national intellectual property office, which is authorized in 3 months and 24 days in 2020, has the authorized bulletin number CN109899537B and is named as a high-voltage ultrahigh-voltage shielding electric regulating valve; the invention patent with the name of high-pressure ultra-high-pressure shielding compressor is authorized in the year 6 and 30 of 2020, and the authorized bulletin number is CN 109899314B; the invention patent with the name of high-pressure or ultra-high-pressure shielding pump is authorized in 7 months of 2020 and the publication number of CN 109737072B; the invention is authorized in 2021, 5 and 14 days, and the patent with the publication number of CN109701445B is entitled "a high-voltage or ultra-high-voltage shielding stirring kettle", overcomes the defects of the patent of a high-voltage ultra-high-voltage medium environment shielding motor, and has the advantages of reliable sealing between a shielding sleeve and a pressure balancing diaphragm, difficult damage caused by thermal stress and convenient connection of motor stator leads. However, these patent techniques still have a problem that whether the leakage occurs in the shield case or the pressure balance diaphragm cannot be automatically checked from the outside of the shield motor, and once the leakage occurs due to breakage of the shield case or the pressure balance diaphragm, serious consequences such as explosion may be caused in the case of treating highly corrosive and highly oxidizing fluids.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a leakage self-checking high-voltage or ultra-high-voltage environment shielding motor.

The technical scheme adopted by the invention is as follows:

a leakage self-checking high-voltage or ultra-high-voltage environment shielding motor comprises a stator, a rotor, a shielding sleeve, a leakage detection sleeve, a pressure balance diaphragm and a leakage detection diaphragm.

The shielding sleeve is a thin-wall cylinder with an outer circle inserted into an inner cavity of the leakage detection sleeve, the inner cavity is sleeved with the outer circle of the motor rotor in a clearance fit manner, and axial temperature compensation waves are arranged on the shielding sleeve facing the rear cover end of the motor; the leakage detecting sleeve is a thin-wall cylinder with an outer circle inserted into the inner cavity of the motor stator, the inner cavity is sleeved with the outer circle of the shielding sleeve, the leakage detecting sleeve facing the rear cover end of the motor is provided with axial temperature compensating waves matched with the shielding sleeve, and the leakage detecting sleeve is provided with a leakage liquid collecting groove protruding to the inner cavity of the motor stator along the axial direction;

the pressure balance diaphragm is a circular diaphragm with annular corrugation; the leak detection diaphragm is a circular diaphragm with circumferential corrugation, which is matched with the pressure balance diaphragm; the pressure balance diaphragm, the leak detection diaphragm and the complete annular welding seam are together isolated with the shielding sleeve and the leak detection sleeve to isolate the motor rotor from the inner cavity of the motor stator and also isolate inert liquid from working fluid; the pressure balance diaphragm faces the working fluid of the motor, the leak detection diaphragm faces the inert liquid of the motor, the pressure balance diaphragm and the leak detection diaphragm are mutually overlapped, and the circumferences of the two diaphragms are fixedly arranged on the circumference of the end face of the motor rear cover bearing seat facing the rear cover;

the leak detection sleeve is connected with a leak detection conduit I, and the leak detection diaphragm is connected with a leak detection conduit I I.

As a further technical scheme, the front end and the rear end of the shielding sleeve are respectively and fixedly arranged on the motor rear cover bearing seat and the motor driving end bearing seat.

As a further technical scheme, the front end and the rear end of the leakage detection sleeve are respectively and fixedly arranged on a motor rear cover bearing seat and a motor driving end bearing seat.

As a further technical scheme, the cylindrical winding or the cylindrical squirrel cage in the middle of the motor rotor is matched with the cavity of the shielding sleeve in a clearance fit manner, and the motor rotor is made of an anti-corrosion material or coated with an anti-corrosion coating or covered with an anti-corrosion sleeve.

As a further technical scheme, the motor stator consists of a stator core and a winding coil, the motor stator wound with the winding is in a cylinder shape with bosses at two ends, the inner cavity of the cylinder is matched with the outer cylindrical surface of the leakage detection sleeve, the matching relationship is clearance fit, and the outer circle of the cylinder with the winding is in interference fit with the inner hole of the motor shell.

As a further technical scheme, the shielding sleeve, the leakage detecting sleeve, the pressure balance diaphragm and the leakage detecting diaphragm are all made of corrosion-resistant metal sheets.

As a further technical scheme, the leakage detection conduit I is positioned on the side of the leakage detection sleeve facing the bearing seat of the motor driving end, and the leakage detection conduit I is led to the outer wall of the motor shell; the leak detection conduit I I leads to the outer wall of the motor rear cover.

As a further technical scheme, the motor rear cover is a flat cover with a boss, a counter bore matched with a rear cover bearing seat is arranged at the axial position of the end face of the boss, a groove is arranged at the center of the counter bore, the groove is an inert liquid balance chamber, the size of the inert liquid balance chamber is required to meet the shrinkage amount caused by cold shrinkage when the inert liquid works or the placing temperature is lower than the filling temperature, and two sealing grooves are arranged on the cylindrical surface of the boss; an axial inert liquid balance hole, a radial inert liquid balance hole and a positioning pin blind hole are formed in the position between the inert liquid balance chamber at the end face of the boss and the edge of the boss, and an inert liquid filling port is correspondingly and penetratingly formed in one position of the end face of the flat cover and the axial inert liquid balance hole; the motor rear cover is uniformly provided with bolt holes arranged on the motor shell.

As a further technical scheme, the rear cover bearing seat is formed by coaxially arranging a cylinder, a transition cone and a flange plate, a bearing hole is arranged at the axial center of the rear cover bearing seat, and a bearing is arranged in the bearing hole; a boss matched with the counter bore of the rear cover is arranged at one end of the flange, and a working fluid balance chamber is arranged at the center of the boss, wherein the size of the working fluid balance chamber is required to meet the expansion amount of the inert liquid when working or placing at a temperature higher than the filling temperature; the edge of the boss is provided with a thinning annular groove for fixedly installing a pressure balance diaphragm and a leak detection diaphragm; the edge of the end part of the cylinder of the back cover bearing seat is provided with a thinning ring groove welded with the shielding sleeve and the leakage detecting sleeve; the flange is respectively provided with a positioning pin hole and an inert liquid balance hole matched with the axial inert liquid balance hole of the rear cover, and meanwhile, the inert liquid balance hole on the front end face of the flange is provided with an inert liquid balance groove communicated with the inner cavity of the motor stator, so that inert liquid can flow fast in the inert liquid balance chamber and gaps between the inner cavity of the motor stator and the leakage detection sleeve according to pressure change, and the pressure is balanced; the positioning pin holes on the flange plate are correspondingly matched with the positioning pin blind holes on the matched rear cover boss; and a rear cover working fluid balance hole is arranged along the axis at the outer edge of the bearing hole of the end face of the cylinder.

As a further technical scheme, the bearing seat of the driving end of the motor is formed by a flange plate and a boss on the flange plate, a bearing hole is arranged at the axial center of the bearing seat of the driving end, and a bearing is arranged in the bearing hole; countersunk bolt holes for installing the countersunk bolt holes on the stepped holes in the inner cavity of the motor stator are uniformly distributed on the flange plate; and a through driving end working fluid balance hole is arranged along the axis at the outer edge of the end face bearing hole of the driving end bearing seat.

The installation process comprises the following steps:

firstly, a rear cover bearing is installed in a rear cover bearing seat, a shaft neck which is arranged on one end of a motor rotor facing the rear cover and is matched with an inner ring or a bearing bush of the rear cover bearing is installed in the inner ring or the bearing bush of the rear cover bearing, one end of a shielding sleeve facing the rear cover bearing seat and provided with axial temperature compensation waves is sleeved into the motor rotor and fixedly installed on a corresponding thinning ring groove on the rear cover bearing seat, one end of a leakage detection sleeve facing the rear cover bearing seat and provided with axial temperature compensation waves is sleeved outside the shielding sleeve and fixedly installed on the other thinning ring groove of the rear cover bearing seat;

then, the motor rotor, the shielding sleeve, the leakage detection sleeve and the rear cover bearing seat which are connected together are assembled into the motor stator inner cavity together from the rear cover end of the motor shell, the positioning pin holes on the flange plate of the rear cover bearing seat and the positioning pin blind holes on the step for installing the rear cover bearing seat in the motor shell are aligned, the positioning pin holes penetrating through the flange plate of the rear cover bearing seat are inserted into the positioning pins for positioning, and the inert liquid balance groove on the front end surface of the flange plate of the rear cover bearing seat penetrates through the gap between the motor stator inner cavity and the leakage detection sleeve;

then, fixedly mounting one end of the leakage detecting sleeve and one end of the shielding sleeve, which face the driving end of the motor, on a thinning annular groove in the motor shell, wherein the step hole of the bearing seat of the driving end is mounted on the thinning annular groove, and fixedly mounting a leakage detecting guide pipe I of the shielding sleeve on a corresponding opening of the leakage detecting sleeve I through an opening of the motor shell;

then, fixedly mounting the pressure balance diaphragm on a thinning annular groove on the corresponding periphery of the end face deformation groove of the rear cover bearing seat facing the rear cover, then fixedly mounting the leak detection diaphragm on another thinning annular groove on the corresponding periphery of the end face deformation groove of the rear cover bearing seat facing the rear cover after superposing the leak detection diaphragm on the pressure balance diaphragm, and fixedly mounting the pressure balance diaphragm leak detection conduit I I on the leak detection diaphragm corresponding opening;

finally, sleeving the rear cover opening with an overpressure balance diaphragm leakage detection conduit I I, and installing and fastening a rear cover fastener; the driving end bearing is arranged in the driving end bearing seat, and then the motor rotor is arranged towards the driving end, the journal matched with the inner ring or the bearing bush of the driving end bearing is arranged in the inner ring or the bearing bush of the driving end bearing, and the driving end bearing seat fastener is fastened.

The invention has the beneficial effects that:

the invention overcomes the defect that the prior shielding motor generates accidents due to the mutual mixing of working fluid and inert liquid caused by the damage of the shielding sleeve or the pressure balance diaphragm. According to the invention, by adding the leakage detecting sleeve, the leakage detecting diaphragm, the leakage detecting guide pipe I and the leakage detecting guide pipe II, leakage can be detected in time, and serious accidents are avoided.

In the invention, the pressure balance diaphragm and the leak detection diaphragm are circular diaphragms with annular corrugations, and the annular corrugations are arranged to facilitate the deformation of the circular diaphragms;

in the invention, the end of the shielding sleeve, which faces the rear cover of the motor, is provided with axial temperature compensation waves; the leakage detecting sleeve is provided with axial temperature compensating waves matched with the shielding sleeve, and the inert liquid expands with heat and contracts with cold, so that the heat stress is eliminated as much as possible by heating the temperature compensating waves on the shielding sleeve and the leakage detecting sleeve.

The leakage detecting sleeve is provided with a leakage liquid collecting groove protruding to the inner cavity of the motor stator along the axial direction; because the gap between the shielding sleeve and the leakage detecting sleeve is very small, the accumulated quantity of the working fluid after leakage is very small, and the quantity of the leaked working fluid can be increased by arranging the collecting groove, so that the detection sensitivity is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.

FIG. 1 is a schematic diagram of a cross-sectional view of the structural principle of the present invention;

FIG. 2 is a schematic illustration of section A-A of FIG. 1;

FIG. 3 is a schematic view of section B-B of FIG. 1;

FIG. 4 is an enlarged view of a portion of I of FIG. 1;

FIG. 5 is an enlarged view of part of II in FIG. 1;

fig. 6 is an enlarged view of part of III in fig. 1.

In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustrations are used for illustration only. 1. The device comprises a shielding sleeve, 2, a leakage detection sleeve, 3, a pressure balance diaphragm, 4, a leakage detection diaphragm, 5, a motor rotor, 5-1, a motor shaft, 6, a motor stator, 7, a motor shell, 8, a cooling jacket, 9, a driving end bearing, 10, a driving end bearing seat, 11, a rear cover bearing, 12, a rear cover bearing seat, 13, a driving end connecting flange, 14, a rear cover, 15, a driving end fastener, 16, a rear cover fastener, 17, a driving end working fluid conducting hole, 18, a rear cover working fluid conducting hole, 19, a locating pin, 20, a cooling fluid inlet and outlet, 21, an inert liquid filling port, 22, a motor lead connecting port, 23, a leakage detection conduit I,24 and a leakage detection conduit I I.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the present invention clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if they mean only the directions of upper, lower, left and right in correspondence with the drawings themselves, are not limiting in structure, but merely serve to facilitate description of the present invention and simplify description, rather than to indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As described in the background art, the present invention provides a leakage self-detecting high-voltage or ultra-high-voltage environment shielding motor for solving the above technical problems.

In a typical embodiment of the present invention, as shown in fig. 1, the high-pressure or ultra-high-pressure environment shielding motor for leak self-test disclosed in the present invention is composed of a shielding sleeve 1, a leakage detecting sleeve 2, a pressure balance diaphragm 3, a leakage detecting diaphragm 4, a motor rotor 5, a motor stator 6, a motor housing 7, a cooling jacket 8, a driving end bearing 9, a driving end bearing seat 10, a rear cover bearing 11, a rear cover bearing seat 12, a driving end connecting flange 13, a rear cover 14, a driving end fastener 15, a rear cover fastener 16, a driving end working fluid conducting hole 17, a rear cover working fluid conducting hole 18, a positioning pin 19, a cooling fluid inlet and outlet 20, an inert fluid filling port 21, a motor lead connecting port 22, a leakage detecting conduit I23 and a leakage detecting conduit II 24.

The motor rotor 5 is composed of a rotor shaft and a columnar winding wound in the axial middle of the rotor shaft or a columnar squirrel cage arranged in the axial middle of the rotor shaft, the rotor shaft is made of S30408, journals matched with the inner rings or the bearing bushes of the driving end bearing 9 and the rear cover bearing 11 are respectively arranged at two ends of the rotor shaft, the outer cylindrical surface of the columnar winding or the columnar squirrel cage in the middle of the motor rotor 5 is matched with the cavity of the shielding sleeve 1, the matching relationship is clearance fit, and the motor rotor 5 is coated with a corrosion-resistant coating.

The motor stator 6 is composed of a stator core and a winding coil, wherein the stator core is formed by overlapping silicon steel sheets, the winding is formed by winding red copper enameled wires, the motor stator 6 wound with the winding is in a cylinder shape with bosses at two ends, the inner cavity of the cylinder with the winding is matched with the outer cylindrical surface of the leakage detecting sleeve 2, the matching relationship is clearance fit, and the outer circumference of the cylinder with the winding is in interference fit with the inner hole of the motor shell.

The motor shell 7 is a 20Mn forge piece, and is a cavity provided with a step hole matched with the motor stator 6, the driving end bearing seat 10, the rear cover bearing seat 12 and the rear cover 14 in the inner cavity; the driving end of the motor shell 7 is also provided with a flange plate connected with a pump, a compressor, a stirring kettle or a regulating valve; a step for fixing the driving end bearing seat 10 is provided with a threaded hole matched with a bolt hole of the driving end bearing seat 10, and the edge of the step near the inner cavity is provided with a thinning annular groove for installing the shielding sleeve 1 and the leakage detecting sleeve 2; a step for fixing the back cover bearing seat 12 is provided with a positioning pin blind hole matched with a positioning pin hole of the back cover bearing seat 12; screw holes matched with the flat cover screw holes of the rear cover 14 are arranged at the rear cover end of the motor shell 7.

As shown in fig. 1, 2, 4 and 5, a shielding sleeve 1 is a thin-wall cylinder with an outer circle inserted into an inner cavity of a leakage detection sleeve, the inner cavity is sleeved on the outer circle of a motor rotor 5, and is made of an S31603 stainless steel sheet with the thickness of 0.15 or 0.2mm, the diameter of the inner cavity is in clearance fit with the motor rotor 5, and the outer diameter of the inner cavity is in clearance fit with the inner circle of the leakage detection sleeve 2; the front end and the rear end of the shielding sleeve 1 are respectively and fixedly arranged on the thinning ring grooves of the rear cover bearing seat 12 and the driving end bearing seat 10 through argon arc welding, and the axial temperature compensation corrugation is arranged at the end of the shielding sleeve 1 facing the rear cover so as to counteract the temperature difference stress caused by expansion and contraction due to temperature change of the shielding sleeve 1;

the leak detection sleeve 2 is a thin-walled cylinder with an outer circle inserted into the inner cavity of the motor stator 6, the inner cavity is sleeved with the outer circle of the shielding sleeve 1, the thin-walled cylinder is made of an S31603 stainless steel sheet with the thickness of 0.15 or 0.2mm, the inner cavity is in clearance fit with the outer circle of the shielding sleeve 1, and the outer circle is in clearance fit with the inner cavity of the motor stator 6; the front end and the rear end of the leakage detection sleeve 2 are fixedly arranged on the thinning annular grooves of the end bearing seat 12 of the rear cover shaft and the end bearing seat 10 of the driving end respectively through argon arc welding, the leakage detection sleeve 2 is provided with axial temperature compensation ripples matched with the shielding sleeve 1 towards the rear cover end, the leakage detection sleeve 2 is provided with a leakage liquid collecting groove protruding towards the inner cavity of the motor stator 6 along the axial direction, the leakage detection sleeve 2 is provided with a hole matched with a leakage detection guide pipe I23 towards the driving end, namely the leakage detection guide pipe I23 is connected with the leakage detection sleeve 2, and the leakage detection guide pipe I23 leads to the outer wall of the rear cover;

as shown in fig. 1, 3 and 6, the pressure balance diaphragm 3 and the leak detection diaphragm 4 are mutually overlapped, and are circular diaphragms with circular ring corrugation, and are made of S31603 stainless steel sheets with the thickness of 0.15 or 0.2 mm; the circumferences of the two diaphragms are fixedly arranged on the thinning groove on the circumference of the deformation groove of the end face of the rear cover bearing seat 12 facing the rear cover through argon arc welding; the leak detection diaphragm 4 is provided with a hole matched with the leak detection conduit II 24, namely, the leak detection conduit II 24 is connected to the side of the leak detection diaphragm 4 facing the rear cover 14, and the leak detection conduit II 24 is led to the outer wall of the rear cover 14.

The pressure balance diaphragm 3 faces the working fluid and the leak detection diaphragm 4 faces the inert liquid. The pressure balance diaphragm 3, the leak detection diaphragm 4 and the complete annular welding seam are together with the shielding sleeve 1 and the leak detection sleeve 2 to isolate the inner cavities of the motor rotor 5 and the motor stator 6 and also isolate inert liquid and working fluid; the annular corrugations on the pressure balance diaphragm 3 and the leak detection diaphragm 4 balance the pressure change of the working fluid and the inert liquid on both sides of the pressure balance diaphragm 3 and the leak detection diaphragm 4 by the deformation of the annular corrugations, and meanwhile, the positive and negative deformation of the annular corrugations on the pressure balance diaphragm 3 and the leak detection diaphragm 4 should meet the expansion and contraction deformation of the inert liquid caused by the working or placing temperature higher or lower than the filling temperature of the inert liquid.

As shown in fig. 1, the rear cover 14 is a flat cover with a boss, a 20Mn forging is selected, a counter bore matched with the rear cover bearing seat 12 is arranged at the axial position of the end face of the boss, a groove is arranged at the center of the counter bore and is an inert liquid balance chamber, the size of the inert liquid balance chamber is required to meet the shrinkage amount caused by cold shrinkage when the inert liquid works or the placing temperature is lower than the filling temperature, and two sealing grooves are arranged on the cylindrical surface of the boss; an axial inert liquid balance hole, a radial inert liquid balance hole and a positioning pin blind hole are formed in the position between the inert liquid balance chamber at the end face of the boss and the edge of the boss, and an inert liquid filling port 21 is correspondingly and penetratingly formed in one position of the end face of the flat cover and the axial inert liquid balance hole; bolt holes are uniformly distributed on the flat cover and are arranged on the motor shell 7.

As shown in fig. 1, the rear cover bearing seat 12 is formed by coaxially arranging a cylinder, a transition cone and a flange plate, and a bearing hole is arranged at the axial center of the rear cover bearing seat, a bearing is arranged in the bearing hole, and the bearing material is corrosion-resistant alloy; the rear cover bearing seat is made of S30508 stainless steel forgings; if the bearing is a rolling bearing, the outer ring of the rolling bearing is embedded into the bearing hole in an interference fit manner for installation and fixation; if the bearing is a sliding bearing, the sliding bearing bush is embedded into the bearing hole in an interference fit manner for installation and fixation; a boss matched with the counter bore of the rear cover is arranged at one end of the flange, and a working fluid balance chamber is arranged at the center of the boss, wherein the size of the working fluid balance chamber is required to meet the expansion amount of the inert liquid when working or placing at a temperature higher than the filling temperature; the edge of the boss is provided with a thinning annular groove for fixedly installing the pressure balance diaphragm 3 and the leak detection diaphragm 4 so as to weld the edges of the pressure balance diaphragm 3 and the leak detection diaphragm 4 at the edge of the working fluid balance chamber, and the welding seam has the functions of fixing and sealing at the same time, so that the working fluid and inert liquid at two sides of the pressure balance diaphragm 3 and the leak detection diaphragm 4 are isolated; the edge of the end part of the cylinder of the back cover bearing seat 12 is provided with a thinning annular groove welded with the shielding sleeve 1 and the leakage detection sleeve 2 so as to weld one end edge of the shielding sleeve 1 and the leakage detection sleeve 2 with axial temperature compensation ripple on the side surface of the cylinder of the back cover bearing seat 12, and the welding seam has the functions of fixing and sealing and separates working fluid surrounding the motor rotor 6 from inert liquid in the inner cavity of the motor stator 5; the flange is respectively provided with a positioning pin hole and an inert liquid balance hole matched with the axial inert liquid balance hole of the rear cover 14, and meanwhile, the inert liquid balance hole on the front end surface of the flange is provided with an inert liquid balance groove communicated with the inner cavity of the motor stator 5, so that inert liquid can flow fast in the inert liquid balance chamber and gaps between the inner cavity of the motor stator 5 and the leakage detection sleeve 2 according to pressure change, thereby balancing pressure; the positioning pin holes on the flange are correspondingly matched with the positioning pin blind holes on the matched boss of the rear cover 14; and a rear cover working fluid balance hole is arranged along the axis at the outer edge of the bearing hole of the end face of the cylinder.

As shown in fig. 1, the driving end bearing seat 10 is formed by a flange plate and a boss on the flange plate, a bearing hole is arranged at the axial center of the driving end bearing seat, a bearing is arranged in the bearing hole, the bearing material is corrosion-resistant alloy, and the driving end bearing seat material is selected from S30508 stainless steel forgings; if the bearing is a rolling bearing, the outer ring of the rolling bearing is embedded into the bearing hole in an interference fit manner for installation and fixation; if the bearing is a sliding bearing, the sliding bearing bush is embedded into the bearing hole in an interference fit manner for installation and fixation; countersunk bolt holes for installing the countersunk bolt holes on the stepped holes in the inner cavity of the motor stator 5 are uniformly distributed on the flange plate; a through driving end working fluid balance hole is arranged along the axis at the outer edge of the end face bearing hole of the driving end bearing seat 10.

The total installation process comprises the following steps:

firstly, a bearing inner ring or a bearing bush of a rear cover bearing is arranged in a bearing hole at the axial center position of a rear cover bearing seat 12, a shaft neck which is arranged at one end of a motor rotor 5 facing to a rear cover 14 and matched with the bearing inner ring or the bearing bush of the rear cover bearing 11 is arranged in the bearing inner ring or the bearing bush of the rear cover bearing, one end of a shielding sleeve 1 with axial temperature compensation ripple is sleeved into the motor rotor 5 facing to the direction of the rear cover bearing seat 12, the motor rotor is fixedly arranged on a corresponding thinning ring groove on the rear cover bearing seat 12 through argon arc welding, one end of a leakage detection sleeve 2 with the axial temperature compensation ripple is sleeved outside the shielding sleeve 1 facing to the direction of the rear cover bearing seat 12, and the motor rotor is fixedly arranged on the other thinning ring groove of the rear cover bearing seat 12 through argon arc welding.

Then, the motor rotor 5, the shielding sleeve 1, the leakage detecting sleeve 2, the rear cover bearing 11 and the rear cover bearing seat 12 which are connected together are assembled into the inner cavity of the motor stator 6 together from the rear cover end of the motor shell 7, the positioning pin holes on the flange plate of the rear cover bearing seat 12 and the positioning pin blind holes on the step for installing the rear cover bearing seat 12 in the motor shell 7 are aligned, the positioning pins are inserted in a penetrating way for positioning, and the inert liquid balance groove on the front end face of the flange plate of the rear cover bearing seat 12 penetrates through the gap between the inner cavity of the motor stator and the leakage detecting sleeve.

Then, the leak detection sleeve 2 and one end of the shielding sleeve 1 facing the driving end of the motor are fixedly arranged on a thinning annular groove of a step hole of the bearing seat 10 of the driving end in the motor shell 7 through argon arc welding, and then a shielding sleeve leak detection guide pipe I23 penetrates through an opening of the motor shell 7 to be fixedly arranged on a corresponding opening of the leak detection sleeve 2 through welding;

then, fixedly mounting the pressure balance diaphragm 3 on a thinning annular groove on the periphery of the deformation groove of the end face of the back cover bearing seat 12 facing the back cover 14 through argon arc welding, then fixedly mounting the leak detection diaphragm 4 on another thinning annular groove on the periphery of the deformation groove of the end face of the back cover bearing seat 12 facing the back cover 14 through argon arc welding after superposing the leak detection diaphragm 3 on the pressure balance diaphragm, and fixedly mounting the pressure balance diaphragm leak detection conduit II 24 on a corresponding opening of the leak detection diaphragm 4;

then, the corresponding opening hole on the rear cover 14 is sleeved with an overpressure balance diaphragm leakage detection guide pipe II 24, the inert liquid balance hole of the rear cover 14 correspondingly penetrates through the inert liquid balance hole of the rear cover bearing seat 12, the positioning pin blind hole of the rear cover 14 correspondingly is arranged on the matched positioning pin on the rear cover bearing seat 12, and the rear cover fastener is arranged and fastened; the outer ring or the bush of the bearing of the driving end bearing 9 is arranged in a bearing hole of a bearing body of the driving end bearing seat 10, then the inner ring or the bush of the bearing of the driving end bearing 9 is sleeved on a shaft neck of a motor rotor facing the driving end, and the bearing is fixed on a step in the motor shell 7 by a driving end fastener.

Process of working fluid and inert liquid equilibration:

in order to allow the pressure balance diaphragm 3 to rapidly act and allow both ends of the driving end bearing 9 and the rear cover bearing 11 to rapidly balance pressure without striking the shield case when the working fluid just enters the gap between the motor rotor 5 and the shield case 1 or when the working fluid pressure changes, the driving end bearing housing 10 and the rear cover bearing housing 12 are provided with a driving end working fluid balance hole and a rear cover working fluid balance hole to the working fluid balance chamber through the gap between the motor rotor 5 and the shield case 1.

The fast balancing channel from the working fluid inlet to the working fluid balancing chamber is specifically:

working fluid inlet- & gtdriving end working fluid balance hole- & gtgap between motor rotor 5 and shield 1- & gtback cover working fluid balance hole- & gtworking fluid balance chamber.

In order to ensure the rapid and sensitive pressure balance of the inner side and the outer side of the shielding sleeve 1 and the leakage detecting sleeve 2, radial inert liquid balance holes, axial inert liquid balance holes, inert liquid balance holes and inert liquid balance grooves from the inert liquid balance chamber to the gap between the motor stator 6 and the leakage detecting sleeve 2 are arranged on the rear cover 14 and the rear cover bearing seat 12.

The fast balancing channel from the inert liquid balancing chamber to the leakage detecting sleeve 2 is specifically:

inert liquid balance chamber- & gtradial inert liquid balance hole- & gtaxial inert liquid balance hole- & gtinert liquid balance groove- & gtgap between motor stator 6 and leak detection sleeve 2.

The operation steps are as follows:

when the working fluid with or without pressure enters the gap between the motor rotor 5 and the shielding sleeve 1, the working fluid quickly enters the gap between the motor rotor 5 and the shielding sleeve 1 through the driving end working fluid balance hole arranged on the driving end bearing seat 10, and then quickly enters the working fluid balance chamber through the rear cover working fluid balance hole arranged on the rear cover bearing seat 12, so that the two ends of the driving end bearing 9 and the rear cover bearing 11 are quickly filled with the working fluid without impacting the shielding sleeve 1; along with the entering of working fluid, the pressure of the working fluid in a gap between a motor rotor 5 and a shielding sleeve 1 gradually rises to be equal to the pressure of the working fluid outside the gap, incompressible inert liquid simultaneously rapidly flows between an inert liquid balance chamber and a motor stator 6, a leakage detection sleeve 2 and a motor shell 7 through an axial inert liquid balance hole and a radial inert liquid balance hole, and the pressures at two sides of the shielding sleeve 1, the leakage detection sleeve 2, a pressure balance diaphragm 3 and a leakage detection diaphragm 4 are balanced in real time, so that the effect that the shielding sleeve 1, the leakage detection sleeve 2, the pressure balance diaphragm 3 and the leakage detection diaphragm 4 are not stressed is achieved, and the thicknesses of the shielding sleeve 1, the leakage detection sleeve 2, the pressure balance diaphragm 3 and the leakage detection diaphragm 4 are not required to be increased, and the transmission efficiency and the service life are improved; if the shielding sleeve 1 or the pressure balance diaphragm 3 is damaged, the leakage detection sleeve 2 and the leakage detection diaphragm 4 can detect leakage in time, so that more serious accidents are avoided.

Finally, it is pointed out that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor is characterized by comprising a stator, a rotor, a motor rear cover, a motor shell, a shielding sleeve, a leakage detection sleeve, a pressure balance diaphragm and a leakage detection diaphragm;

the shielding sleeve is a thin-wall cylinder with an outer circle inserted into an inner cavity of the leakage detection sleeve, the inner cavity is sleeved with the outer circle of the motor rotor in a clearance fit manner, and axial temperature compensation waves are arranged on the shielding sleeve facing the rear cover end of the motor; the leakage detecting sleeve is a thin-wall cylinder with an outer circle inserted into the inner cavity of the motor stator, the inner cavity is sleeved with the outer circle of the shielding sleeve, the leakage detecting sleeve facing the rear cover end of the motor is provided with axial temperature compensating waves matched with the shielding sleeve, and the leakage detecting sleeve is provided with a leakage liquid collecting groove protruding to the inner cavity of the motor stator along the axial direction;

the pressure balance diaphragm is a circular diaphragm with annular corrugation; the leak detection diaphragm is a circular diaphragm with circumferential corrugation, which is matched with the pressure balance diaphragm; the pressure balance diaphragm and the leak detection diaphragm are mutually overlapped, and the circumferences of the two diaphragms are fixedly arranged on the circumference of the end face of the motor rear cover bearing seat, which faces the rear cover; the pressure balance diaphragm faces to the working fluid of the motor, and the leak detection diaphragm faces to the inert liquid of the motor;

the leak detection sleeve is connected with a leak detection conduit I; leak hunting conduit I I is connected to the leak hunting membrane.

2. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the front end and the rear end of the shielding sleeve are fixedly arranged on a motor rear cover bearing seat and a motor driving end bearing seat respectively.

3. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the front end and the rear end of the leakage detecting sleeve are fixedly arranged on a motor rear cover bearing seat and a motor driving end bearing seat respectively.

4. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the cylindrical winding or the cylindrical cage in the middle of the motor rotor is matched with the cavity of the shielding sleeve in a clearance fit, and the motor rotor is made of an anti-corrosion material or coated with an anti-corrosion coating or covered with an anti-corrosion sleeve.

5. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the motor stator is composed of a stator core and winding coils, the motor stator wound with windings is in a cylinder shape with bosses at two ends, the inner cavity of the cylinder is matched with the outer cylinder surface of the leakage checking sleeve, the matching relationship is clearance fit, and the outer circle of the cylinder with the windings is in interference fit with the inner hole of the motor shell.

6. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the shielding sleeve, the leakage detecting sleeve, the pressure balancing diaphragm and the leakage detecting diaphragm are all made of corrosion-resistant metal sheets.

7. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the leakage detection conduit I is positioned on the side of the leakage detection sleeve facing the bearing seat of the motor driving end, and the leakage detection conduit I is led to the outer wall of the motor shell; and the leakage detection guide pipe II is led to the outer wall of the motor rear cover.

8. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the motor rear cover is a flat cover with a boss, a counter bore matched with a bearing seat of the rear cover is arranged at the axial position of the end face of the boss, a groove is arranged at the center part of the counter bore, the groove is an inert liquid balance chamber, the size of the inert liquid balance chamber is required to meet the shrinkage amount caused by the working or placing temperature of the inert liquid is lower than the filling temperature, and two sealing grooves are arranged on the cylindrical surface of the boss; an axial inert liquid balance hole, a radial inert liquid balance hole and a positioning pin blind hole are formed in the position between the inert liquid balance chamber at the end face of the boss and the edge of the boss, and an inert liquid filling port is correspondingly and penetratingly formed in one position of the end face of the flat cover and the axial inert liquid balance hole; the motor rear cover is uniformly provided with bolt holes arranged on the motor shell.

9. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 8, wherein the back cover bearing seat is formed by a cylinder, a transition cone and a flange disc coaxially, a bearing hole is arranged at the axial center position of the back cover bearing seat, and a bearing is arranged in the bearing hole; a boss matched with a counter bore of a rear cover of the motor is arranged at one end of the flange, and a working fluid balance chamber is arranged at the center of the boss, wherein the size of the working fluid balance chamber is required to meet the expansion amount of the inert liquid when working or the placing temperature is higher than the filling temperature; the edge of the boss is provided with a thinning annular groove for fixedly installing a pressure balance diaphragm and a leak detection diaphragm; the edge of the end part of the cylinder of the back cover bearing seat is provided with a thinning ring groove welded with the shielding sleeve and the leakage detecting sleeve; the flange plate is respectively provided with a positioning pin hole and an inert liquid balance hole matched with the axial inert liquid balance hole of the rear cover, meanwhile, the inert liquid balance hole on the front end surface of the flange plate is provided with an inert liquid balance groove communicated with the inner cavity of the motor stator, and the positioning pin hole on the flange plate is correspondingly matched with a positioning pin blind hole on a boss of the rear cover of the matched motor; and a rear cover working fluid balance hole is arranged along the axis at the outer edge of the bearing hole of the end face of the cylinder.

10. The leakage self-checking high-voltage or ultra-high-voltage environment shielding motor according to claim 1, wherein the motor driving end bearing seat is formed by a flange plate and a boss above the flange plate, a bearing hole is arranged at the axial center of the driving end bearing seat, and a bearing is arranged in the bearing hole; countersunk bolt holes for installing the countersunk bolt holes on the stepped holes in the inner cavity of the motor stator are uniformly distributed on the flange plate; and a through driving end working fluid balance hole is arranged along the axis at the outer edge of the end face bearing hole of the driving end bearing seat.