CN220692895U - Corrosion shielding protection structure of high-speed motor rotor - Google Patents

Abstract

The utility model discloses a high-speed motor rotor corrosion shielding protection structure, which relates to the technical field of high-speed motor rotor corrosion protection and comprises a guard ring, an end ring, rotor cage bars, a rotor iron core and a notch block; the rotor cage bars are assembled in cage bar grooves of the rotor iron core, the end parts of the rotor cage bars extend outwards and are propped against the end rings, the outer ends of the end rings are propped against the guard rings, and the end rings wrap the end parts of the end rings and the end parts of the rotor cage bars extending outwards; the notch block is assembled in a cage bar groove of the rotor core and is positioned above the rotor cage bar, and the rotor cage bar in the cage bar groove is sealed and protected. According to the high-speed motor rotor corrosion shielding protection structure, the sealing can be realized by adopting a simpler notch block processing mode, an expensive integral shielding sleeve is not needed, and the reduction of the integral cost of equipment is facilitated; the method has better applicability to the high-speed motor, and can be used for large-capacity high-speed motors by adopting an integral welding structure.

Description

Corrosion shielding protection structure of high-speed motor rotor

Technical Field

The utility model relates to the technical field of high-speed motor rotor corrosion protection, in particular to a high-speed motor rotor corrosion shielding protection structure.

Background

For motor products operating in corrosive environments (corrosive gases or liquids, with the corrosive gases or liquids as cooling media for the motor), rotor protection is conventionally performed by: a shielding sleeve processed by the corrosion-resistant material is used for isolating the motor rotor from external media.

A commonly employed structural schematic is shown in fig. 6, wherein the sequence 01 represents a shroud ring, the sequence 02 represents an end ring, the sequence 03 represents a rotor cage bar, the sequence 04 represents a rotor core, and the sequence 05 represents a shield sleeve. In the assembly process, after the rotor iron core, the rotor cage bars, the end rings and the guard rings are assembled, the anti-corrosion shielding sleeve is sleeved, and after the shielding sleeve is sleeved in place, the shielding sleeve is welded on the sequence 01 guard rings at the two ends by adopting circumferential girth welds. By the mode, the sealing of the inner assembly part can be realized, and the whole shielding is realized.

The structure belongs to a structure which is frequently adopted by a conventional shielding motor, but has certain limitation on application occasions, and the application occasions are mostly motors with the rotating speed of 1500rpm or lower or small motors, so that the requirement of high-capacity (high-power gear) high-speed motors can not be met. In addition, if the rotor length is longer, the span of the shroud is larger, and there is a potential risk of the shroud bulging.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to provide a corrosion shielding protection structure for a rotor of a high-speed motor, so as to solve the problems of the adoption of a shielding sleeve.

In order to achieve the above purpose, the present utility model adopts the technical scheme that:

a high-speed motor rotor corrosion shielding protection structure comprises a guard ring, an end ring, rotor cage bars, a rotor iron core and a notch block;

the rotor cage bars are assembled in cage bar grooves of the rotor iron core, the end parts of the rotor cage bars extend outwards and are propped against the end rings, the outer ends of the end rings are propped against the guard rings, and the end rings wrap the end parts of the end rings and the end parts of the rotor cage bars extending outwards;

the notch block is assembled in a cage bar groove of the rotor core and is positioned above the rotor cage bar, and the rotor cage bar in the cage bar groove is sealed and protected.

Preferably, the outer side wall of the rotor core is provided with a plurality of cage bar grooves along the circumferential direction, the cage bar grooves are distributed along the length direction of the rotor core, and the rotor cage bars are provided with a plurality of cage bar grooves and are respectively assembled in the cage bar grooves.

Preferably, the notch blocks are provided with a plurality of notch blocks and are respectively welded above the rotor cage bars in each cage bar groove of the rotor core.

Preferably, the guard ring extends to the plane of the end face of the rotor core in the direction of the rotor core and contacts with the end face of the rotor core and the end face of the notch block, and the end ring and the end part of the rotor cage strip extending outwards are wrapped in the guard ring.

Preferably, the end of the retaining ring, which is in contact with the rotor core and the notch block, is provided with an annular welding groove along the circumferential direction and is welded with the rotor core and the notch block.

Preferably, the depth of the annular welding groove is smaller than the depth of the notch block.

Preferably, the notch blocks are equal notch blocks, inclined notch blocks and/or wide notch blocks;

the width of the equal notch block is the same as that of the rotor cage bar; the width of the bottom end face of the inclined slot block is the same as that of the rotor cage bar, and the two sides of the inclined slot block face upwards and outwards; the width of the wide slot opening block is larger than that of the rotor cage bar.

Preferably, the guard ring, the end ring, the rotor cage bars, the rotor core and the notch blocks form a rotor combination, and a corrosion-resistant layer is arranged on the outer side of the rotor combination.

The utility model has the beneficial effects that:

according to the high-speed motor rotor corrosion shielding protection structure, the sealing can be realized by adopting a simpler notch block processing mode, an expensive integral shielding sleeve is not needed, and the reduction of the integral cost of equipment is facilitated; the method has better applicability to the high-speed motor, and can cope with the high-capacity and high-speed motor by adopting an integral welding structure; the method is mainly applied to special occasions, and has unique applicability to occasions with large capacity and high rotating speed and needing to shield the rotor.

Drawings

FIG. 1 is a schematic diagram 1 of the present utility model;

FIG. 2 is a schematic diagram 2 of the present utility model;

FIG. 3 is an enlarged view of a portion of the end of the grommet of the present utility model;

FIG. 4 is a schematic view of the bezel block assembly of the present utility model;

FIG. 5 is a schematic view of the wide slot block assembly of the present utility model;

FIG. 6 is a schematic diagram of a prior art shield;

reference numerals:

1. a guard ring; 2. an end ring; 3. rotor cage bars; 4. a rotor core; 5. notch block.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model.

Currently, high-speed motors are increasingly widely used, and for some high-capacity, high-speed motors, laminated rotors are generally not suitable for high-speed conditions. At this time, the rotor is in the form of a solid structure in which the rotor core is formed or a solid structure in which the rotor core is integrally formed with the rotation shaft. When a high-capacity and high-rotation-speed motor needs to operate in a corrosive environment (corrosive gas or liquid), the rotor needs to be effectively shielded and protected, and particularly, rotor cage bars (usually made of pure copper, copper alloy or aluminum alloy materials) are required to be shielded and protected.

General shielding structure as shown in fig. 6, when the structure is directly applied to a high-capacity high-rotation-speed motor, the stress of the middle part of the shielding sleeve is larger due to the larger centrifugal force, and the possibility that the shielding sleeve reaches the yield limit and cracks or overall tearing occurs exists. In addition, the shielding case also increases the overall cost of the motor due to its high cost (usually by using a precision spinning process). In order to meet the requirements of a high-capacity and high-rotation-speed motor, the embodiment provides a shielding rotor structure without a shielding sleeve.

In comparison, the rotor cage bars (usually made of pure copper, copper alloy or aluminum alloy) in the rotor are easy to corrode, and if a solid rotor structure is adopted, the rotor core can be made of corrosion-resistant steel. In principle, the corrosion-resistant treatment method mentioned in this embodiment uses the corrosion resistance of the shaft body material, the guard ring material and the notch block material to form an effective seal between the shaft body material, the guard ring material and the notch block material, and seals the rotor cage bar with poor corrosion resistance (usually made of pure copper, copper alloy or aluminum alloy) into the interior, thereby achieving the purpose of coping with corrosive environments.

Example 1

The high-speed motor rotor corrosion shielding protection structure comprises a guard ring 1, an end ring 2, rotor cage bars 3, a rotor core 4 and a notch block 5 as shown in figures 1 and 2; the rotor cage bars 3 are assembled in cage bar grooves of the rotor iron core 4, the end parts of the rotor cage bars 3 extend outwards and are propped against the end rings 2, the outer ends of the end rings 2 are propped against the guard rings 1, and the guard rings 1 wrap the end parts of the end rings 2 and the end parts of the rotor cage bars 3 extending outwards; the notch block 5 is assembled in a cage bar groove of the rotor core 4 and is positioned above the rotor cage bar 3, and the rotor cage bar 3 in the cage bar groove is sealed and protected.

As shown in fig. 2, the outer side wall of the rotor core 4 is provided with a plurality of cage bar grooves along the circumferential direction thereof, the cage bar grooves are distributed along the length direction of the rotor core 4, and the rotor cage bars 3 are provided with a plurality of cage bar grooves and are respectively assembled in the plurality of cage bar grooves. The notch blocks 5 are provided with a plurality of rotor cage bars 3 which are respectively welded above each cage bar groove of the rotor core 4.

As shown in fig. 1, the shroud ring 1 extends toward the rotor core 4 to a plane where the end face of the rotor core 4 is located and contacts the end face of the rotor core 4 and the end face of the notch block 5, and the shroud ring 1 wraps the end ring 2 and the end portion of the rotor cage bar 3 protruding outward therein. The end of the guard ring 1, which is contacted with the rotor core 4 and the notch block 5, is provided with an annular welding groove along the circumferential direction and is welded with the rotor core 4 and the notch block 5.

In the assembly process of the embodiment, after the rotor core 4, the rotor cage bars 3 and the end rings 2 are assembled, the notch blocks 5 are driven in, so that the notch blocks 5 and the rotor core 4 are matched with each other in a small tight fit manner for facilitating the implementation of subsequent procedures. After the notch block 5 is mounted in place, the notch block 5 forms a through-joint with the rotor core 4 in the axial direction. The joints are then welded in the axial direction by means of welding, so that an effective seal is formed between the slot blocks 5 and the rotor core 4, protecting the inner rotor cage bars 3 (copper or aluminum material). And the joint of the guard ring 1, the notch block 5 and the rotor core 4 at the two ends is provided with an annular welding groove along the circumferential direction, and is welded into a whole along the groove, and the guard ring 1, the notch block 5 and the rotor core 4 are welded into a whole, so that the sealing at the two ends by using the girth weld is realized.

Note that the groove depth between the end guard ring 1 and the notch block 5 and the rotor core 4 is smaller than the depth of the notch block 5. In the processing of the two ends, groove welding is not the only processing method, and other welding types or welding of the two end sealing blocks after the sealing blocks are adopted can be adopted. Considering the thermal expansion of the rotor cage bars 3 (copper or aluminum), an expansion gap is reserved between the guard ring 1 and the rotor cage bars 3, and the problem that the welding seam is stressed or the welding seam fails due to different expansion lengths caused by the difference of expansion coefficients between the rotor cage bars 3 and the rotor iron core 4 is solved. In its implementation, the rotor cage bars 3 are flush with the core end face, and the notch blocks 5 extend beyond the core end face by a certain expansion gap, and a partial enlarged view of this position is shown in fig. 3.

The notch block 5 is an equal notch block, an inclined notch block and/or a wide notch block; the width of the equal slot blocks is the same as that of the rotor cage bars 3; the width of the bottom end face of the inclined slot block is the same as that of the rotor cage bar 3, and the two sides of the inclined slot block are inclined upwards and outwards; the width of the wide notch block is larger than the width of the rotor cage bars 3.

In this embodiment, the slot block form is not the only form, and other common slot block forms include a diagonal slot block (as shown in fig. 4, tightened with a taper), a slot block wider than a wide slot block of a rotor cage bar (as shown in fig. 5), or other similar forms. The same processing as described above is used in the implementation of the integral seal.

The protection ring 1, the end ring 2, the rotor cage bars 3, the rotor core 4 and the notch blocks 5 form a rotor combination, and the outer side of the rotor combination is provided with a corrosion-resistant layer. If the corrosive environment is worse, the rotor core material cannot be applied to the corrosive environment or the corrosion resistance of the material is reduced due to bimetallic welding, and the subsequent process can be adopted.

The subsequent process is to increase the subsequent treatment based on the previous process for dealing with the harsher corrosion environment. The outer surface of the rotor after the treatment can be regarded as a whole, and the whole can be subjected to additional treatment after being subjected to turning. The outer surface of the rotor is provided with secondary protection by means of supersonic spraying, electroplating and the like. It should be noted that the base material selected for supersonic spraying and electroplating is a better corrosion-resistant material, and the coating range covers the whole rotor core end to the two side guard rings. The supersonic spraying and electroplating mentioned in this structural type are possible realization methods, and the patent covers other similar treatment methods using covering materials.

Example 2

A high-speed motor rotor corrosion shielding protection method comprises the following steps:

1. rotor cage bar installation

S1, assembling a rotor cage bar in a cage bar groove of a rotor core;

in the step S1, a plurality of cage bar grooves are formed in the outer side wall of the rotor core along the circumferential direction of the rotor core, the cage bar grooves are distributed along the length direction of the rotor core, and a plurality of rotor cage bars are respectively assembled in the cage bar grooves.

In this embodiment, for the rotor core, the rotor cage bars are installed in the cage bar slots therein, and the rotor cage bars provide a path for induced current, so that the induced current generates a rotational torque in the rotating magnetic field, and the torque output of the motor as a whole is ensured.

2. End ring installation

S2, assembling end rings at the ends of the rotor cage bars, which extend outwards;

in this embodiment, the end ring functions as: a closed path for current flow is formed between the induced current induced in the rotor and the end ring.

In the step S2, the end ring and the rotor cage bars are connected in a brazing or interference fit mode.

In this embodiment, the end ring is installed after the rotor cage bars are installed, and the end ring and the rotor cage bars are generally in a brazing structure, so that the interference fit is also small.

3. Notch block mounting

S3, installing the notch blocks above rotor cage bars in cage bar grooves of the rotor core, sequentially welding joints between the notch blocks and the rotor core after installation, and sealing the rotor cage bars in the cage bar grooves below the notch blocks;

in the step S3, when the notch block is installed, small tight fit is adopted between the notch block and the cage bar groove of the rotor core; after the notch block is installed in place, the notch block and the rotor core form a through joint along the axial direction, and then a welding method is adopted to weld the joint along the axial direction of the rotor core, so that a rotor cage bar in a cage bar groove below the notch block is sealed.

In the assembly process, after the rotor core, the rotor cage bars and the end rings are assembled, the notch blocks are driven in, so that the notch blocks and the rotor core are matched with each other in a small tight amount for facilitating the implementation of subsequent procedures. After the notch block is mounted in place, the notch block and the rotor core form a through seam in the axial direction. And then, a welding method is adopted to weld joints along the axial direction, so that effective sealing is formed between the notch blocks and the rotor core, and the inner rotor cage bars (copper or aluminum materials) are protected.

The rotor cage bar is of a strip-shaped stepped structure, the middle part of the rotor cage bar is large, the left end and the right end of the rotor cage bar are small, and the left end and the right end of the rotor cage bar extend outwards from the rotor core; the notch block is of a strip-shaped structure consistent with the rotor cage bars, and the length of the notch block is slightly longer than that of the rotor core and slightly shorter than that of the rotor cage bars.

In the step S3, the notch blocks are equal notch blocks, inclined notch blocks and/or wide notch blocks;

the width of the equal notch block is the same as that of the rotor cage bar; the width of the bottom end face of the inclined slot block is the same as that of the rotor cage bar, and the two sides of the inclined slot block face upwards and outwards; the width of the wide slot opening block is larger than that of the rotor cage bar.

In this embodiment, the notch blocks may be equal notch blocks having the same width as the rotor cage bars. The form of the notch block is not the only form and other commonly used notch block forms include a bevel notch block (tightened with a pitch) that is wider than the wide notch block of the rotor cage bar or other similar forms. The same processing mode is adopted in the realization of integral sealing.

4. Guard ring installation

S4, assembling the guard ring on the end ring to wrap the end ring and the end part of the rotor cage bar, which extend outwards, and welding the guard ring, the notch blocks and the rotor core at the two ends of the rotor core into an integral rotor structure by utilizing an annular welding groove on the guard ring;

in this embodiment, after the end ring and the rotor cage bar are effectively connected, the protecting ring is assembled on the end ring to wrap the end part of the end ring and the rotor cage bar, which extends outwards, and the protecting ring is in interference fit with the end ring, and the installation is realized by adopting a heating protecting ring hot jacket mode.

In this embodiment, the guard ring is the main component for bearing the end of the rotor rotating at high speed, and the huge centrifugal force generated by the end ring and the end of the rotor cage bar and the centrifugal force generated by the guard ring are mainly borne by the guard ring when the rotor rotates at high speed. The stress of the end ring and the end part of the rotor cage bar is not too large due to the existence of the guard ring. Typically, the grommet is made of a high strength alloy steel material.

After the retaining ring is installed in place, the retaining ring, the notch blocks and the rotor core at the two ends of the rotor core are welded into an integral rotor structure by utilizing the annular welding grooves on the retaining ring.

In the step S4, an annular welding groove is formed in the end, where the retaining ring is in contact with the rotor core and the notch block, along the circumferential direction, and the retaining ring, the notch block and the rotor core are welded into a whole along the annular welding groove.

In this embodiment, for both ends, the joint of the guard ring, the notch block and the rotor core is formed with an annular welding groove along the circumferential direction, and the guard ring, the notch block and the rotor core are welded into a whole along the groove, thereby realizing both ends sealing by using the girth weld.

In the step S4, the depth of the annular welding groove is smaller than that of the notch block.

In this embodiment, the groove depth between the end guard ring and the notch block and between the rotor core is smaller than the groove depth of the notch block, and this is because: the reliable contact of the retaining ring and the axial direction of the notch block needs to be ensured, and when the groove depth is smaller than the groove depth of the notch block, a part of the notch block is in direct contact with the retaining ring, so that the axial positioning of the retaining ring and the notch block is realized. The corrosive environment where the motor is often accompanied by high pressure, the direct contact of the guard ring and the notch block can directly resist the external high pressure environment, and the direct action of the force generated by the external high pressure environment on the welding seam between the guard ring and the notch block is avoided. In the processing of the two ends, groove welding is not the only processing method, and other welding types or welding of the two end sealing blocks after the sealing blocks are adopted can be adopted.

In the step S4, an expansion gap is reserved between the guard ring and the stepped surface of the rotor cage bar when the guard ring is assembled.

In this embodiment, the rotor cage bars have a stepped structure, where the rotor cage bars on one side of the stepped surface extend to the end ring, and the rotor cage bars on the other side are in the cage bar grooves of the rotor core. The stepped interface is at the end face of the rotor core such that the shroud is axially directed to the slot blocks, which are higher than the end face of the rotor core, and the expansion gap between the shroud and the rotor cage bars is provided.

In this embodiment, considering the thermal expansion of the rotor cage bars (copper or aluminum), an expansion gap is left between the retaining ring and the rotor cage bars, and the difference of expansion coefficients between the rotor cage bars and the rotor core is used to cause stress on the welding seam or failure of the welding seam. In general, the rotor is heated and expands in the running state, the rotor cage bars are made of copper, copper alloy or aluminum alloy, and the rotor core is made of steel. The expansion coefficient of nonferrous metal (copper and aluminum) is higher than that of steel, and the expansion value of nonferrous metal (copper and aluminum) is higher than that of iron core under the same temperature condition. Therefore, the rotor cage bars and the end rings drive the guard ring to move outwards, so that the welding seam between the guard ring and the notch block rotor core is stressed, or the welding seam is invalid. In the implementation form, the rotor cage bars are in a ladder shape, the ladder-shaped interface is flush with the rotor core (absolute flush of the rotor cage bars and the end ring can be realized through machining sequences after the rotor cage bars and the end ring are welded and before the notch blocks are installed), the ladder-shaped surfaces of the rotor cage bars are flush with the end surface of the core, and the notch blocks are longer than a certain expansion gap of the end surface of the core.

The rotor cage bars are made of copper or aluminum, the rotor iron core and the notch blocks are made of corrosion-resistant steel, and the guard rings are made of high-strength alloy steel.

In the embodiment, the rotor cage bars are made of copper or aluminum, the rotor iron core is made of corrosion-resistant steel, and the notch blocks are made of corrosion-resistant steel; because of bearing the action of larger centrifugal force, the guard ring is made of high-strength alloy steel, and meanwhile, the anti-corrosion performance is also considered.

In the embodiment, the rotor core material, the guard ring material and the notch block material are utilized to form effective sealing, and the rotor cage bars with poor corrosion resistance are sealed inside, so that the aim of coping with corrosive environments is fulfilled.

In the embodiment, the notch blocks and the rotor iron cores are welded to form effective sealing to shield the rotor cage bars on the rotor, and the sealing can be realized by adopting a simpler notch block processing mode without adopting an expensive integral shielding sleeve, so that the integral cost of equipment is reduced.

By adopting the notch block structure, the whole section is welded with the rotor core, and the two sides of the notch block are welded, so that the notch block is well connected with the rotor core. From the perspective of the finished product of the rotor, the notch block and the rotor core can be considered to form a whole, and the structure has strong mechanical applicability. Therefore, when the novel high-speed motor is applied to a high-capacity high-rotation-speed motor, cracks or integral tearing of the notch block cannot occur due to larger centrifugal force (the shielding sleeve only welds two ends, the middle of the high-speed rotation is easy to bulge so as to cause stress failure, the notch block is integrally welded, and the two sides are welded, so that the novel high-speed motor has better connection and stronger mechanical applicability).

5. Ultrasonic spray plating treatment

S5, carrying out ultrasonic spraying and/or electroplating treatment on the outer surface of the rotor structure;

in the embodiment, the corrosion-resistant steel material can cope with a general corrosion environment, and when the corrosion environment is worse, a material with better corrosion resistance can be attached to the surface of the steel material in a supersonic spraying and/or electroplating mode. In addition, the ultrasonic spraying and electroplating require good overall performance of appearance, and gaps generated by contact cannot be filled in both modes, so that the problem of gap corrosion of a finished product is caused. The notch block and the rotor core are welded into a whole, so that the problem of contact gaps does not exist, and the method is suitable for the treatment mode.

In the step S5, after the whole turning of the outer surface of the welded whole rotor structure, supersonic spraying and/or electroplating treatment is carried out.

In the method, the purpose of integral turning of the outer surface is to maintain the integrity, and the problems of uneven appearance and the like due to the working procedures such as welding and the like are solved, and the integral plane is ensured to meet the surface conditions of ultrasonic spraying and/or electroplating treatment by turning the outer surface.

In the step S5, the base material selected for the supersonic spraying and/or electroplating treatment is made of a corrosion-resistant material, and the coating range covers the whole rotor core to the protective rings at the two sides.

In this embodiment, if the corrosive environment is worse, the rotor core material cannot be applied to the corrosive environment or the corrosion resistance of the material is reduced due to the bimetal welding, and the subsequent step S5 may be adopted.

And S5, adding subsequent treatment on the basis of the step S4 for coping with the harsher corrosion environment. The outer surface of the rotor after the treatment can be regarded as a whole, and the whole can be subjected to additional treatment after being subjected to turning. The outer surface of the rotor is provided with secondary protection by means of supersonic spraying, electroplating and the like. It should be noted that the base material selected for supersonic spraying and electroplating is a better corrosion-resistant material, such as hastelloy, alumina ceramic, etc., and the coating range covers the whole rotor core end to the two side guard rings. The supersonic spraying and electroplating mentioned in this structural type are possible realization methods, and the patent covers other similar treatment methods using covering materials.

6. Application in corrosive environment

S6, installing the rotor structure on the high-speed motor and applying the rotor structure to a corrosive environment.

The key points of the embodiment mainly include:

(1) The notch block is welded with the rotor core to form a shielding form for effectively sealing the rotor;

(2) The guard rings at the two ends are welded with the notch blocks and the rotor core to realize sealing or other similar treatment methods;

(3) Other similar notch block forms and similar processing methods;

(4) A method of treating the clearance gap in response to the difference in expansion coefficient between the rotor cage bars and the rotor core is considered.

While the embodiments of the present utility model have been described in detail, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (8)

1. The high-speed motor rotor corrosion shielding protection structure is characterized by comprising a guard ring (1), an end ring (2), rotor cage bars (3), a rotor core (4) and a notch block (5);

the rotor cage bars (3) are assembled in cage bar grooves of the rotor iron core (4), the end parts of the rotor cage bars (3) extend outwards and are propped against the end ring (2), the outer ends of the end ring (2) are propped against the guard ring (1), and the guard ring (1) wraps the end ring (2) and the end parts of the rotor cage bars (3) extending outwards;

the notch block (5) is assembled in a cage bar groove of the rotor core (4) and is positioned above the rotor cage bar (3), and the rotor cage bar (3) in the cage bar groove is sealed and protected.

2. The rotor corrosion shielding and protecting structure according to claim 1, wherein a plurality of cage bar grooves are formed in the outer side wall of the rotor core (4) along the circumferential direction, the cage bar grooves are distributed along the length direction of the rotor core (4), and the rotor cage bars (3) are provided with a plurality of cage bar grooves and are respectively assembled in the plurality of cage bar grooves.

3. Rotor corrosion shielding structure according to claim 2, characterized in that the notch blocks (5) are provided with a number of rotor cage bars (3) welded respectively in each cage bar slot of the rotor core (4).

4. A rotor corrosion shielding and protecting structure according to claim 3, wherein the protecting ring (1) extends to the plane of the end face of the rotor core (4) in the direction of the rotor core (4) and contacts the end face of the rotor core (4) and the end face of the notch block (5), and the protecting ring (1) wraps the end ring (2) and the end part of the rotor cage bar (3) which extends outwards.

5. The rotor corrosion shielding protection structure according to claim 4, wherein the end of the shroud ring (1) contacting the rotor core (4) and the notch block (5) is provided with an annular welding groove along the circumferential direction, and is welded with the rotor core (4) and the notch block (5).

6. Rotor corrosion shielding structure according to claim 5, characterized in that the depth of the annular welding groove is smaller than the depth of the notch block (5).

7. Rotor corrosion shielding structure according to claim 1, characterized in that the notch blocks (5) are equinotch blocks, oblique notch blocks and/or wide notch blocks;

the width of the equal notch block is the same as that of the rotor cage bar (3); the width of the bottom end face of the inclined slot block is the same as that of the rotor cage bar (3), and the two sides of the inclined slot block are inclined upwards and outwards; the width of the wide slot opening block is larger than that of the rotor cage bar (3).

8. The rotor corrosion shielding protection structure according to claim 1, wherein the guard ring (1), the end ring (2), the rotor cage bars (3), the rotor core (4) and the notch blocks (5) form a rotor assembly, and a corrosion-resistant layer is arranged on the outer side of the rotor assembly.