A high-speed motor rotor corrosion shielding protection method

Abstract

The application discloses a high-speed motor rotor corrosion shielding protection method and relates to the technical field of high-speed motor rotor corrosion protection. The application utilizes the corrosion resistance of rotor core material, guard ring material and slot block material, and a welding treatment mode, so that effective sealing is formed between the rotor core, the guard ring and the slot block, the rotor cage with poor corrosion resistance is sealed to the inside, and the purpose of coping with a corrosive environment is achieved. The sealing can be achieved by adopting a relatively simple slot block treatment mode, without adopting an expensive overall shielding sleeve, so that the overall cost of equipment is reduced; the high-speed motor has good applicability, the overall welded structure can be adopted to cope with a large-capacity high-speed motor; and the application is mainly aimed at special occasions, and has unique applicability to occasions where a large-capacity high-speed motor needs to be shielded.

Description

Technical Field

[0001] This invention relates to the field of high-speed motor rotor corrosion protection technology, and more specifically to a method for shielding and protecting high-speed motor rotors from corrosion. Background Technology

[0002] For motor products operating in corrosive environments (corrosive gases or liquids, or using corrosive gases or liquids as the motor's cooling medium), the conventional method for rotor protection is to isolate the motor rotor from the external medium using a shield made of corrosion-resistant material. A commonly used structural diagram is shown below. Figure 7 As shown, sequence 01 represents the retaining ring, sequence 02 represents the end ring, sequence 03 represents the rotor cage bar, sequence 04 represents the rotor core, and sequence 05 represents the shielding sleeve. During assembly, after the rotor core is assembled with the rotor cage bar, end ring, and retaining ring, the corrosion-resistant shielding sleeve is heat-fitted. After the shielding sleeve is in place, a circumferential weld is used to weld the shielding sleeve to the retaining rings (sequence 01) at both ends. This method achieves sealing of the internal components and provides overall shielding.

[0003] This structure is commonly used in conventional shielded motors, but it has certain limitations in application. It is mostly used for motors with speeds of 1500 rpm or below, or small motors, and cannot meet the needs of high-capacity (high-power) high-speed motors. Additionally, if the rotor length is long and the span of the shielding sleeve is large, there is a potential risk of the shielding sleeve bulging. Currently, high-speed motors are finding increasingly widespread applications. For some large-capacity, high-speed motors, laminated rotors are often unsuitable for high-speed operating conditions. In such cases, the rotor configuration is either a solid rotor core or a solid rotor core integrated with the shaft. When large-capacity, high-speed motors need to operate in corrosive environments (corrosive gases or liquids), effective shielding protection for the rotor is required, especially for the rotor cage bars (often made of pure copper, copper alloys, or aluminum alloys).

[0004] As mentioned above, when this type of shielding structure is directly applied to high-capacity, high-speed motors, the stress in the middle part of the shielding sleeve is relatively high due to the large centrifugal force. This may lead to cracks or even complete tearing of the shielding sleeve when it reaches its yield limit. In addition, the high cost of the shielding sleeve (usually achieved through precision spinning) also increases the overall cost of the motor. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this invention discloses a corrosion shielding protection method for high-speed motor rotors. The purpose of this invention is to solve the problem that existing shielding sleeves are unsuitable for corrosion shielding protection of large-capacity, high-speed motors. The rotor cage bars (often made of pure copper, copper alloy, or aluminum alloy) are easily corroded. If a solid rotor structure is used, the rotor core can be made of corrosion-resistant steel. The corrosion shielding protection method mentioned in this invention utilizes the corrosion resistance of the shaft body material, retaining ring material, and slot block material to form an effective seal, sealing the poorly corrosion-resistant rotor cage bars (often made of pure copper, copper alloy, or aluminum alloy) inside, thereby achieving the purpose of coping with corrosive environments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for shielding and protecting the rotor from corrosion of a high-speed motor includes the following steps: I. Rotor cage bar installation S1. Assemble the rotor cage bars into the cage bar slots of the rotor core; Preferably, in step S1, a plurality of cage bar grooves are formed on the outer side wall of the rotor core along its circumferential direction. 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 plurality of cage bar grooves.

[0007] In this invention, for the rotor core, rotor cage bars are installed in the cage bar slots. The rotor cage bars provide a path for induced current, thereby generating rotational torque in the rotating magnetic field, ensuring the overall torque output of the motor.

[0008] II. End Ring Installation S2. Assemble the end rings at the outwardly extending ends of the rotor cage bars; In this invention, the function of the end ring is to form a closed current path between the induced current in the rotor and the end ring.

[0009] Preferably, in step S2, the connection between the end ring and the rotor cage bar is achieved by brazing or interference fit.

[0010] In this invention, after the rotor cage bars are installed, the end rings are installed. The end rings and rotor cage bars are generally brazed, although interference fit is also used, but it is less common.

[0011] III. Installation of Groove Blocks S3. Install the slotted block above the rotor cage bars in the cage bar slot of the rotor core. After installation, weld the joint between the slotted block and the rotor core in sequence to seal the rotor cage bars in the cage bar slot below the slotted block. Preferably, in step S3, when installing the slot block, a small tight fit is used between the slot block and the cage bar slot of the rotor core; after the slot block is installed in place, the slot block and the rotor core form a through joint in the axial direction, and then the joint is welded along the axial direction of the rotor core to seal the rotor cage bars in the cage bar slot below the slot block.

[0012] In the assembly process of this invention, after the rotor core, rotor cage bars, and end rings are assembled, the slotted block is driven in. To facilitate subsequent processes, a small tightness fit is used between the slotted block and the rotor core. After the slotted block is installed in place, a through joint is formed between the slotted block and the rotor core along the axial direction. Subsequently, welding is used to weld the joint along the axial direction, thereby forming an effective seal between the slotted block and the rotor core, protecting the internal rotor cage bars (made of copper or aluminum).

[0013] Preferably, the rotor cage bars are long strips with a stepped structure, larger in the middle and smaller at both ends, with the left and right ends extending outwards from the rotor core; the slot blocks are long strips with the same shape as the rotor cage bars, and their length is slightly longer than that of the rotor core but slightly shorter than that of the rotor cage bars.

[0014] Preferably, in step S3, the slot block is an equal slot block, an oblique slot block, and / or a wide slot block; The width of the equal slot block is the same as the width of the rotor cage bar; the width of the bottom end face of the inclined slot block is the same as the width of the rotor cage bar, and both sides are inclined upward and outward; the width of the wide slot block is greater than the width of the rotor cage bar.

[0015] In this invention, the slotted block can be a uniform slotted block, with its width being the same as the width of the rotor cage bars. The form of the slotted block is not the only form; other commonly used forms include inclined slotted blocks (using an incline for tightening), wide slotted blocks wider than the rotor cage bars, or other similar types. The same processing method is used to achieve the overall seal.

[0016] IV. Installation of retaining ring S4. Assemble the retaining ring on the end ring to wrap the end ring and the outwardly extending ends of the rotor cage bars. Then, using the annular welding bevel on the retaining ring, weld the retaining ring, slot block and rotor core at both ends of the rotor core into an integral rotor structure. In this invention, after the end ring and rotor cage bars are effectively connected, the retaining ring is assembled on the end ring to wrap around the end ring and the outwardly extending ends of the rotor cage bars. The retaining ring is fitted with the end ring in an interference fit, and the installation is achieved by heating the retaining ring in a heat-shrinkable manner.

[0017] In this invention, the retaining ring is the main load-bearing component at the end of the high-speed rotating rotor. During high-speed rotation, the enormous centrifugal force generated by the end rings and rotor cage bars, as well as the centrifugal force generated by the retaining ring itself, is primarily borne by the retaining ring. Due to the presence of the retaining ring, the stress on the end rings and rotor cage bars is not excessive. Typically, the retaining ring is made of high-strength alloy steel.

[0018] After the retaining ring is installed in place, the retaining ring, slotted block and rotor core at both ends of the rotor core are welded together into an integral rotor structure using the annular welding bevel on the retaining ring.

[0019] Preferably, in step S4, an annular welding bevel is formed at the end of the retaining ring that contacts the rotor core and the slotted block along the circumferential direction, and the entire circle is welded along the annular welding bevel to weld the retaining ring, the slotted block, and the rotor core into a whole.

[0020] In this invention, at both ends, an annular welding bevel is opened along the circumferential direction at the junction of the retaining ring, the slotted block, and the rotor core, and a complete circle is welded along the bevel to weld the retaining ring, the slotted block, and the rotor core into a whole, thereby achieving sealing at both ends of the annular weld.

[0021] Preferably, in step S4, the depth of the annular welding groove is less than the depth of the groove block.

[0022] In this invention, the bevel depth between the end retaining ring and the slotted block / rotor core is less than the depth of the slotted block. This is because reliable axial contact between the retaining ring and the slotted block needs to be ensured. When the bevel depth is less than the slotted block depth, a portion of the slotted block directly contacts the retaining ring, thus achieving axial positioning. The corrosive environment in which the motor operates is often accompanied by high pressure. The direct contact between the retaining ring and the slotted block can directly resist the external high-pressure environment, preventing the force generated by the external high-pressure environment from directly acting on the weld between the two. For the treatment of both ends, bevel welding is not the only method; other welding methods or sealing the ends with blocks followed by welding the sealing blocks can also be used.

[0023] Preferably, in step S4, when assembling the retaining ring, an expansion gap is left between the retaining ring and the stepped surface of the rotor cage bars.

[0024] In this invention, the rotor cage bars have a stepped structure. One side of the stepped surface extends to the end ring, while the other side is located within the cage bar slots of the rotor core. The interface of the stepped structure is located on the terminating surface of the rotor core. This allows the retaining ring to extend axially to the slot block, which is higher than the terminating surface of the rotor core, thus creating an expansion gap between the retaining ring and the rotor cage bars.

[0025] In this invention, the thermal expansion of the rotor cage bars (copper or aluminum) is considered. An expansion gap is left between the retaining ring and the rotor cage bars to address the different expansion lengths caused by the difference in expansion coefficients between the rotor cage bars and the rotor core, which could lead to stress on the weld or weld failure. Typically, the rotor as a whole expands due to heat during operation. The rotor cage bars are usually made of copper, copper alloys, or aluminum alloys, while the rotor core is usually made of steel. The expansion coefficients of non-ferrous metals (copper, aluminum) are higher than those of steel; under the same temperature conditions, the expansion value of non-ferrous metals (copper, aluminum) is greater than that of the core. This causes the rotor cage bars and end rings to move the retaining ring outwards, resulting in stress on the weld between the retaining ring and the slotted rotor core, or potentially weld failure. In practice, the rotor cage bars are stepped, with the stepped interface flush with the rotor core (this flushness can be achieved through machining after welding the rotor cage bars and end rings but before installing the slotted blocks). The stepped surface of the rotor cage bars is flush with the end face of the core, and the slotted blocks extend beyond the end face of the core by a certain expansion gap.

[0026] Preferably, the rotor cage bars are made of copper or aluminum, the rotor core and slot blocks are made of corrosion-resistant steel, and the retaining ring is made of high-strength alloy steel.

[0027] In this invention, the rotor cage bars are made of copper or aluminum, the rotor core is made of corrosion-resistant steel, and the slot blocks are also made of corrosion-resistant steel. Because it needs to withstand a large centrifugal force, the retaining ring is made of high-strength alloy steel, while also taking into account corrosion resistance.

[0028] In this invention, the corrosion resistance of the rotor core material, retaining ring material, and slot block material is utilized to form an effective seal between them, sealing the poorly corrosion-resistant rotor cage bars inside, thereby achieving the purpose of coping with corrosive environments.

[0029] This invention uses slotted blocks welded to the rotor core to form an effective seal that shields the rotor cage bars on the rotor. The seal can be achieved using a relatively simple slotted block treatment method, without the need for an expensive overall shielding sleeve, which helps to reduce the overall cost of the equipment.

[0030] The aforementioned slotted block structure, with the entire section welded to the rotor core and both sides welded, achieves a good connection between the slotted block and the rotor core. From the perspective of the finished rotor, the slotted block and the rotor core can be considered as a whole, and this structure has strong mechanical performance. Therefore, when used in high-capacity, high-speed motors, it will not cause cracks or overall tearing of the slotted block due to large centrifugal forces (the shielding sleeve is only welded at both ends, which easily leads to bulging in the middle during high-speed rotation, resulting in stress failure; the slotted block is welded as a whole section with both sides welded, resulting in a better connection and stronger mechanical performance).

[0031] V. Supersonic spraying and electroplating treatment S5. The outer surface of the rotor structure is treated with supersonic spraying and / or electroplating. In this invention, corrosion-resistant steel can cope with general corrosive environments. When the corrosive environment is more severe, supersonic spraying and / or electroplating can be used to attach materials with better corrosion resistance to the surface. However, both supersonic spraying and electroplating require good overall appearance, and neither method can fill the gaps caused by contact, resulting in crevice corrosion in the finished product. Welding the slotted block to the rotor core into a unified whole eliminates the contact gap problem, making this treatment method suitable.

[0032] Preferably, in step S5, the outer surface of the welded integral rotor structure is machined as a whole before being subjected to supersonic spraying and / or electroplating.

[0033] In the above method, the purpose of machining the outer surface as a whole is to maintain the integrity. Due to the presence of welding and other processes, there are problems such as unevenness on the surface. By machining the outer surface, the overall plane is guaranteed to meet the surface conditions for supersonic spraying and / or electroplating.

[0034] Preferably, in step S5, the substrate selected for the supersonic spraying and / or electroplating treatment is a corrosion-resistant material, and the coating range covers the entire rotor core to the two side retaining rings.

[0035] In this invention, if the corrosive environment is too harsh and the rotor core material cannot be used in the corrosive environment or the corrosion resistance of the material is reduced due to bimetallic welding, the subsequent S5 step can be adopted.

[0036] Step S5 adds a follow-up treatment to step S4 to address harsher corrosive environments. After the above treatments, the rotor's outer surface can be considered a single unit; after machining, additional surface treatments can be applied. Secondary protection is added to the rotor's outer surface using methods such as supersonic spraying and electroplating. It is important to note that the substrates used for supersonic spraying and electroplating must be highly corrosion-resistant materials, such as Hastelloy or alumina ceramics, and the coating should cover the entire rotor core end to the two retaining rings. The supersonic spraying and electroplating mentioned in this structural design are feasible implementation methods; the patent covers other similar treatment methods using covering materials.

[0037] VI. Application in Corrosive Environments S6. The rotor structure is installed on a high-speed motor and used in a corrosive environment.

[0038] The main key points of this invention include: (1) The slotted block is welded to the rotor core to form an effective seal to shield the rotor; (2) Welding the retaining rings at both ends to the slot blocks and rotor core to achieve sealing or other similar treatment methods; (3) Other similar slotted block forms and similar processing methods; (4) Consideration of the reserved gap treatment method to deal with the difference in the expansion coefficient between the rotor cage bar and the rotor core.

[0039] The beneficial effects of this invention are: The high-speed motor rotor corrosion shielding protection method provided by the present invention utilizes the corrosion resistance of the rotor core material, retaining ring material and slot block material, as well as the welding process, to form an effective seal between the rotor core, retaining ring and slot block, sealing the poorly corrosion-resistant rotor cage bars inside, thereby achieving the purpose of coping with corrosive environments.

[0040] The high-speed motor rotor corrosion shielding protection method provided by this invention can achieve sealing by using a relatively simple slot block treatment method, without the need for an expensive overall shielding sleeve, which helps to reduce the overall cost of the equipment; it has good applicability to high-speed motors, and the overall welded structure can handle large-capacity, high-speed motors; it is mainly for special applications, especially for large-capacity, high-speed applications where rotor shielding is required, and has unique applicability. Attached Figure Description

[0041] Figure 1 This is a flowchart of the high-speed motor rotor corrosion shielding protection method of the present invention; Figure 2 This is a schematic diagram of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the present invention. Figure 2 ; Figure 4 This is a partial enlarged view of the retaining ring end of the present invention; Figure 5 This is a schematic diagram of the assembly of the inclined slot block of the present invention; Figure 6 This is a schematic diagram of the assembly of the wide slot block of the present invention; Figure 7 A schematic diagram illustrating the use of a shielding sleeve in existing technology; Figure label: 1. Retaining ring; 2. End ring; 3. Rotor cage bars; 4. Rotor core; 5. Slot block. Detailed Implementation

[0042] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention.

[0043] Example 1 A method for shielding and protecting high-speed motor rotors from corrosion, such as Figure 1 As shown, it includes the following steps: S1. Assemble the rotor cage bars into the cage bar slots of the rotor core; S2. Assemble the end rings at the outwardly extending ends of the rotor cage bars; S3. Install the slotted block above the rotor cage bars in the cage bar slot of the rotor core. After installation, weld the joint between the slotted block and the rotor core in sequence to seal the rotor cage bars in the cage bar slot below the slotted block. S4. Assemble the retaining ring on the end ring to wrap the end ring and the outwardly extending ends of the rotor cage bars. Then, using the annular welding bevel on the retaining ring, weld the retaining ring, slot block and rotor core at both ends of the rotor core into an integral rotor structure. S5. The rotor structure is installed on a high-speed motor and used in a corrosive environment.

[0044] Example 2 This embodiment further elaborates on steps S1 and S2 based on embodiment 1, such as... Figure 2 and 3 As shown, in step S1, a number of cage bar grooves are formed on the outer side wall of the rotor core along its circumferential direction. The cage bar grooves are distributed along the length direction of the rotor core, and a number of rotor cage bars are respectively assembled in the cage bar grooves.

[0045] In step S2, after the rotor cage bars are installed, the end rings are installed. The end rings and rotor cage bars are generally brazed, although interference fit is also used, but it is less common.

[0046] Example 3 Based on Example 2, this embodiment further elaborates on step S3. In step S3, when installing the slot block, a small tight fit is used between the slot block and the cage bar slot of the rotor core. After the slot block is installed in place, the slot block and the rotor core form a through joint along the axial direction. Then, the joint is welded along the axial direction of the rotor core to seal the rotor cage bars in the cage bar slot below the slot block.

[0047] In the assembly process of this invention, after the rotor core, rotor cage bars, and end rings are assembled, the slotted block is driven in. To facilitate subsequent processes, a small tightness fit is used between the slotted block and the rotor core. After the slotted block is installed in place, a through joint is formed between the slotted block and the rotor core along the axial direction. Subsequently, welding is used to weld the joint along the axial direction, thereby forming an effective seal between the slotted block and the rotor core, protecting the internal rotor cage bars (made of copper or aluminum).

[0048] In this invention, the rotor cage bars are long strips with a stepped structure, which are large in the middle and small at both ends, with the left and right ends extending outwards from the rotor core; the slot blocks are long strips with the same shape as the rotor cage bars, and their length is slightly longer than that of the rotor core but slightly shorter than that of the rotor cage bars.

[0049] In step S3, the slot block is an equal slot block, an oblique slot block, and / or a wide slot block; The width of the equal slot block is the same as the width of the rotor cage bar; the width of the bottom end face of the inclined slot block is the same as the width of the rotor cage bar, and both sides are inclined upward and outward; the width of the wide slot block is greater than the width of the rotor cage bar.

[0050] In this invention, the slotted block can be a uniform slotted block, with its width being the same as the width of the rotor cage bars. The form of the slotted block is not the only form; other commonly used slotted block forms include oblique slotted blocks (such as...). Figure 5 As shown, tighten using an inclined surface), the slotted block is wider than the wide slotted block of the rotor cage bars (e.g., Figure 6 (as shown) or other similar types. The same treatment method is used in the implementation of the overall seal.

[0051] Example 4 Based on Example 3, this embodiment further elaborates on step S4. In step S4, after the end ring and rotor cage bars are effectively connected, the retaining ring is assembled on the end ring to wrap around the end ring and the outwardly extending ends of the rotor cage bars. The retaining ring is fitted with the end ring in an interference fit, and the installation is achieved by heating the retaining ring in a heat-shrinkable manner.

[0052] In this invention, the retaining ring is the main load-bearing component at the end of the high-speed rotating rotor. During high-speed rotation, the enormous centrifugal force generated by the end rings and rotor cage bars, as well as the centrifugal force generated by the retaining ring itself, is primarily borne by the retaining ring. Due to the presence of the retaining ring, the stress on the end rings and rotor cage bars is not excessive. Typically, the retaining ring is made of high-strength alloy steel.

[0053] After the retaining ring is installed in place, the retaining ring, slotted block and rotor core at both ends of the rotor core are welded together into an integral rotor structure using the annular welding bevel on the retaining ring.

[0054] In step S4, an annular welding bevel is formed at the end of the retaining ring that contacts the rotor core and the slotted block along the circumferential direction. The entire circle is welded along the annular welding bevel to weld the retaining ring, the slotted block, and the rotor core into a whole.

[0055] In this invention, at both ends, an annular welding bevel is opened along the circumferential direction at the junction of the retaining ring, the slotted block, and the rotor core, and a complete circle is welded along the bevel to weld the retaining ring, the slotted block, and the rotor core into a whole, thereby achieving sealing at both ends of the annular weld.

[0056] In this invention, the bevel depth between the end retaining ring and the slotted block / rotor core is less than the depth of the slotted block. This is because reliable axial contact between the retaining ring and the slotted block needs to be ensured. When the bevel depth is less than the slotted block depth, a portion of the slotted block directly contacts the retaining ring, thus achieving axial positioning of both. The corrosive environment in which the motor operates is often accompanied by high pressure. The direct contact between the retaining ring and the slotted block can directly resist the external high-pressure environment, preventing the force generated by the external high-pressure environment from directly acting on the weld between the two. For the treatment of both ends, bevel welding is not the only method; other welding methods or sealing the ends with blocks followed by welding the sealing blocks can also be used.

[0057] In this invention, the thermal expansion of the rotor cage bars (copper or aluminum) is considered. An expansion gap is left between the retaining ring and the rotor cage bars to address the different expansion lengths caused by the difference in expansion coefficients between the rotor cage bars and the rotor core, which could lead to stress on the weld or weld failure. Typically, the rotor as a whole expands due to heat during operation. The rotor cage bars are usually made of copper, copper alloys, or aluminum alloys, while the rotor core is usually made of steel. The expansion coefficients of non-ferrous metals (copper, aluminum) are higher than those of steel; under the same temperature conditions, the expansion value of non-ferrous metals (copper, aluminum) is greater than that of the core. This causes the rotor cage bars and end rings to move the retaining ring outwards, resulting in stress on the weld between the retaining ring and the slotted rotor core, or potentially weld failure. In practice, the rotor cage bars are stepped, with the stepped interface flush with the rotor core (this flushness can be achieved through machining after welding the rotor cage bars and end rings but before installing the slotted blocks). The stepped surface of the rotor cage bars is flush with the end face of the core, and the slotted blocks extend beyond the end face of the core by a certain expansion gap. Figure 4 As shown.

[0058] In this invention, the corrosion resistance of the rotor core material, retaining ring material, and slot block material is utilized to form an effective seal between them, sealing the poorly corrosion-resistant rotor cage bars inside, thereby achieving the purpose of coping with corrosive environments.

[0059] This invention uses slotted blocks welded to the rotor core to form an effective seal that shields the rotor cage bars on the rotor. The seal can be achieved using a relatively simple slotted block treatment method, without the need for an expensive overall shielding sleeve, which helps to reduce the overall cost of the equipment.

[0060] Example 5 This embodiment further elaborates on the basis of embodiment 4. After step S4 and before step S5, it also includes: applying supersonic spraying and / or electroplating to the outer surface of the rotor structure.

[0061] In this invention, if the corrosive environment is too harsh and the rotor core material cannot be used in the corrosive environment or the corrosion resistance of the material is reduced due to bimetallic welding, subsequent steps can be adopted.

[0062] Subsequent steps, building upon step S4, include additional treatments to address harsher corrosive environments. The rotor's outer surface, after these treatments, can be considered a single unit. After machining, further surface treatments can be applied. Supersonic spraying and electroplating are used to enhance secondary protection on the rotor's outer surface. It is crucial that the substrates used for supersonic spraying and electroplating are highly corrosion-resistant materials, such as Hastelloy or alumina ceramics, with the coating covering the entire rotor core end to the two retaining rings. The supersonic spraying and electroplating methods mentioned in this structural design are feasible implementation methods; the patent covers other similar treatment methods using covering materials.

[0063] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A method for shielding and protecting high-speed motor rotors from corrosion, characterized in that, Includes the following steps: S1. Assemble the rotor cage bars into the cage bar slots of the rotor core; S2. Assemble the end rings at the outwardly extending ends of the rotor cage bars; S3. Install the slotted block above the rotor cage bars in the cage bar slot of the rotor core. After installation, weld the joint between the slotted block and the rotor core in sequence to seal the rotor cage bars in the cage bar slot below the slotted block. S4. Assemble the retaining ring on the end ring to wrap the end ring and the outwardly extending ends of the rotor cage bars. Then, using the annular welding bevel on the retaining ring, weld the retaining ring, slot block and rotor core at both ends of the rotor core into an integral rotor structure. S5. Install the rotor structure on a high-speed motor and apply it to a corrosive environment; In step S1, a plurality of cage bar grooves are formed on the outer side wall of the rotor core along its circumferential direction. 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 plurality of cage bar grooves. In step S3, when installing the slot block, a small tight fit is used between the slot block and the cage bar slot of the rotor core; after the slot block is installed in place, the slot block and the rotor core form a through joint along the axial direction, and then the joint is welded along the axial direction of the rotor core to seal the rotor cage bars in the cage bar slot below the slot block. The rotor cage bars are made of copper or aluminum, the rotor core and slot blocks are made of corrosion-resistant steel, and the retaining ring is made of high-strength alloy steel.

2. The rotor corrosion shielding and protection method as described in claim 1, characterized in that, In step S3, the slot block is an equal slot block, an oblique slot block, and / or a wide slot block; The width of the equal slot block is the same as the width of the rotor cage bar; the width of the bottom end face of the inclined slot block is the same as the width of the rotor cage bar, and both sides are inclined upward and outward; the width of the wide slot block is greater than the width of the rotor cage bar.

3. The rotor corrosion shielding and protection method as described in claim 1, characterized in that, In step S4, an annular welding bevel is formed at the end of the retaining ring that contacts the rotor core and the slotted block along the circumferential direction. The entire circle is welded along the annular welding bevel to weld the retaining ring, the slotted block, and the rotor core into a whole.

4. The rotor corrosion shielding and protection method as described in claim 1, characterized in that, In step S4, the depth of the annular welding groove is less than the depth of the groove block.

5. The rotor corrosion shielding and protection method as described in claim 1, characterized in that, In step S4, when assembling the retaining ring, an expansion gap is left between the retaining ring and the stepped surface of the rotor cage bars.

6. The rotor corrosion shielding and protection method as described in claim 1, characterized in that, After step S4 and before step S5, the method further includes: applying supersonic spraying and / or electroplating to the outer surface of the rotor structure.

7. The rotor corrosion shielding and protection method as described in claim 6, characterized in that, After the outer surface of the welded integral rotor structure is machined, it is then subjected to supersonic spraying and / or electroplating. The substrate used for the supersonic spraying and / or electroplating is a corrosion-resistant material, and the coating range covers the entire rotor core to the two side retaining rings.

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