Rotor for shield pump, motor for shield pump and shield pump

Abstract

The utility model discloses a rotor for a shield pump, a motor for the shield pump and the shield pump, and belongs to the field of shield pumps. According to the rotor provided by the utility model, the annular end plates are respectively attached to the two axial end surfaces of the magnetic steel, and the plastic filling pieces seal the end plates from the outer sides of the end plates, so that the end plates are tightly attached to the end surfaces of the magnetic steel and completely seal the end surfaces of the magnetic steel; the outer end face of the plastic filling member at the axial end of the magnetic steel is provided with at least one first hole site, and the bottom of the first hole site is exposed out of the outer end of the end plate. According to the utility model, the end plate is attached to the end face of the magnetic steel, so that the magnetic steel can be effectively and accurately positioned by using the end plate under the condition that the magnetic steel is not contacted and damaged during processing, thereby ensuring the coaxiality of the initial positions of the magnetic steel and the motor shaft, and effectively optimizing the initial dynamic balance state of the rotor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shield pump more particularly, relate to a rotor for shield pump, motor for shield pump and shield pump. BACKGROUND

[0002] The shield pump is connected together with the pump and motor, the rotor of motor and the impeller of pump are fixed on the same shaft, the rotor and stator of motor are separated by the shield, the rotor operates in the medium to be transported, and the power is transmitted to the rotor through the stator magnetic field. In order to reduce the noise and vibration index of motor in use, the dynamic balance problem in the production process of electronic rotor is particularly important, especially with the increase of motor speed and performance, the requirement of vibration is improved, and the requirement of dynamic balance of motor rotor is also improved. Especially shield pump, the rotor contacts the working medium, but the magnetic steel cannot contact the working medium, and the control requirement of dynamic balance is higher.

[0003] In order to meet the performance requirements of shield pump, the industry generally pays attention to how to correct and repair the dynamic balance of the processed motor rotor at present, such as increasing the weight of the balance ring or punching the weight, and how to optimize the processing and improve the initial dynamic balance state of the rotor in the early stage of the processing process is rarely involved. If the initial dynamic balance performance of the rotor is poor, subsequent dynamic balance adjustment is needed, whether the weight of the balance ring is increased or the weight is reduced by punching, the workload of subsequent correction is increased, and the operation is complicated and inconvenient. Obviously, how to effectively optimize the initial dynamic balance state of the rotor has more practical significance.

[0004] Through retrieval, more attention is paid to how to adjust the dynamic balance in the currently disclosed technology, such as the application disclosed in publication No. CN110707868A discloses a motor rotor corrected by dynamic balance by weight reduction method, metal weight reduction rings are detachably installed on the two side end faces of the rotor core, and the dynamic balance is adjusted by punching on the metal weight reduction ring. When the weight reduction amount is small, it is difficult to accurately grasp, and the weight reduction is easy to be excessive. The application disclosed in publication No. CN218678599U discloses a permanent magnet motor rotor end plate, the rotor end plate is divided into an outer edge part, a matching part and a dynamic balance part, the three parts are made of aluminum alloy and stainless steel respectively, the dynamic balance part made of stainless steel in the center is used as a punching area, and the inner and outer edges are made of aluminum alloy to reduce the weight of the whole rotor end plate. However, punching in the stainless steel punching area in the middle will still cause the weight reduction to be excessive when the weight reduction amount is small, and it is difficult to accurately adjust. Moreover, the above designs do not involve how to optimize the initial dynamic balance state in the rotor processing stage, and the subsequent adjustment pressure of dynamic balance cannot be relieved from the source. UTILITY MODEL CONTENTS

[0005] 1. The technical problem to be solved by the utility model

[0006] In view of the poor dynamic balance performance of the rotor of the canned motor pump in the prior art, the utility model provides a rotor for a canned motor pump, a motor for a canned motor pump and a canned motor pump, through optimization of the rotor structure, the initial dynamic balance state of the rotor can be effectively optimized, the subsequent dynamic balance adjustment amount is reduced, the rotor performance is improved, and the operation is simple and easy to popularize.

[0007] 2. Technical scheme

[0008] To achieve the above object, the utility model provides a technical scheme:

[0009] The utility model discloses a rotor for a canned motor pump, including the magnetic steel of circular ring, and the motor shaft of being arranged in the magnetic steel and with the coaxial arrangement of magnetic steel, be solid between the magnetic steel and motor shaft through plastic filling piece, the outer periphery of magnetic steel is equipped with the isolating cover, the axial both ends of magnetic steel are pasted with the circular ring shaped end plate each, the plastic filling piece is closed from the outside of end plate and makes the end plate close tightly the end face of magnetic steel, and the end face of magnetic steel is completely sealed, the outer end surface of plastic filling piece is provided with at least one first hole position in the axial end of magnetic steel, and the bottom of first hole position exposes the outer end surface of end plate.

[0010] In view of the use condition requirement of the canned motor pump, the magnetic steel needs to be fully sealed and isolated, the utility model is matched with the plastic filling piece in the inside through the isolating cover of the outer periphery, realizes the complete sealing of the inside and outside of magnetic steel, and the plastic filling piece is not only sealed as a sealing element the inside of magnetic steel, simultaneously as connecting piece realizes the fixed connection of magnetic steel and motor shaft. In practice, the plastic filling piece can be integrally injection molded with the magnetic steel and the motor shaft. The coaxiality of the position during the forming process of the magnetic steel and the motor shaft is an important factor affecting the initial dynamic balance of the rotor, and the accuracy of the position of the magnetic steel is difficult to guarantee. If the magnetic steel is directly clamped and positioned during processing, damage will be caused to the surface of the magnetic steel. The design adds end plates to the end faces of the magnetic steel, the end plates can cover and adhere to the end faces of the magnetic steel, and the position of the end plates is positioned to stabilize the position of the magnetic steel without contacting the magnetic steel, thereby guaranteeing the respective fixation of the motor shaft and the magnetic steel, guaranteeing the coaxiality of the two during processing, and optimizing the initial dynamic balance performance of the rotor.

[0011] It should be further explained that the design can leak the outer end face of the end plate through the first hole position, which is beneficial to subsequent adjustment of the dynamic balance of the processed rotor on the basis of optimizing the initial dynamic balance, and the first hole position can also be punched to remove weight from the inner end plate, further adjusting the dynamic balance.

[0012] Further, the plastic filling piece includes an inner cylinder part filled between the motor shaft and the magnetic steel, and an end cover part located at the axial both ends of the inner cylinder part and capable of closing the outer end face of the end plate; a hollow channel extending to both ends is formed in the inner cylinder part; through hollow injection molding of the inner cylinder part, a large number of shrinkage holes generated in the machining process are avoided, which helps to optimize the initial dynamic balance performance. When the extension length of the hollow channel is 2 cm or more, it can be further optimized, and a partition plate is arranged inside to separate the hollow channel into a first channel and a second channel which are not connected to each other along the length direction. In this way, the length of the channel is separated, which facilitates the insertion and ejection of the two end pins in the injection molding process, helps to shorten the length of the pin, prevents the front end of the pin from being easily broken and offset, and the shorter pin is also conducive to ensuring the parallelism with the motor shaft during the machining process, and improving the initial dynamic balance state. In practice, the extension length of the first channel and the second channel is preferably not more than 2 cm.

[0013] The utility model discloses further optimize the subsequent adjustment of dynamic balance, and the material quality of the end plate is preferably greater than the material quality of the plastic filling piece. In practice, the end plate can adopt metal material such as copper, and the plastic filling piece is integrally injection molded plastic material. The end plate and the plastic filling piece are matched, and punching weight removal is carried out together. The material quality of the end plate is relatively large, when the required dynamic balance adjustment amount is relatively large, can first punch weight removal on the end plate through the first hole position, realizes the coarse adjustment of dynamic balance, and when the required weight removal amount is small, then can select the plastic filling piece of material quality relatively light and punch weight removal, so that the weight removal amount is light in single punching, can realize fine adjustment, and avoid the situation that the weight removal is excessive.

[0014] Further, the design of the end plate not only needs to consider the effective fixation of the position of the magnetic steel, but also needs to consider the structural strength of the end plate itself in the machining process and the influence on the overall weight of the rotor. The end plate of the design preferably includes an end ring plate closely attached to the end face position of the magnetic steel, and the axial thickness of the end ring plate is 1.5-2.5 mm, which can meet the clamping requirements of the position stability of the magnetic steel in the machining process, while avoiding obvious deformation of the end plate itself and minimizing the influence on the overall weight of the rotor.

[0015] Further, the inner side of the end ring plate of the end plate is also provided with an embedded part extending towards the inner cavity of the magnetic steel, and the embedded part is annularly matched and embedded in the magnetic steel. The embedded part is beneficial to the rapid installation and fixation of the end plate and the magnetic steel, and ensures the accuracy of the position cooperation of the two.

[0016] Further, to realize subsequent fine adjustment of dynamic balance, at least one second hole position is further formed on the end cover part of the plastic filler, and the position of the second hole position is staggered with the position of the first hole position. When it is needed to punch and remove weight to further optimize the dynamic balance state, coarse adjustment can be realized by first punching and removing weight on the end plate through the first hole position, and as the required weight removal amount gradually decreases, a second hole position can be formed on the end cover part of the plastic filler as a weight removal hole to realize accurate adjustment.

[0017] Further, to ensure the accuracy of the punching position and avoid the internal magnetic steel from leaking out, a mark is arranged on the outer end surface of the end cover part of the plastic filler in a circumferential direction, for example, a ring groove can be used as the mark, and the first hole position is arranged on the circumferential extension path of the mark; the mark can indicate the distribution area of the second hole position in the radial direction of the end cover part, so that the punching area of the second hole position does not exceed the coverage area of the internal end cover, and the internal magnetic steel is avoided from leaking out.

[0018] Further, the hollow passages in the inner cylinder part of the plastic filler include a plurality of passages distributed in a circumferential direction, and the adjacent hollow passages are separated by a separation rib plate extending in the axial direction of the inner cylinder part, and the end surface height of the two ends of the separation rib plate is lower than the outer end surface height of the end cover part of the plastic filler. The separation rib plate is arranged to not only help to enhance the structural strength and stability of the plastic filler, but also to form a plurality of hollow passages that can help to enhance the stirring effect on the liquid medium during use of the rotor, and promote the initial exhaust effect on the liquid medium.

[0019] The utility model discloses a kind of motors for canned motor pump, including the rotor for canned motor pump as described above, further include stator assembly, stator assembly is arranged in the outer periphery of rotor, and shielding cover is provided between stator assembly and rotor to shield isolation.

[0020] The utility model discloses a kind of canned motor pump, including base, base is equipped with the motor for canned motor pump as described above in it, and the motor shaft output end of motor is connected with impeller assembly.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0023] (1) the rotor for canned motor pump of the utility model, by adding end plate on the end surface of magnetic steel, end plate can be covered and attached to the end surface of magnetic steel, after pre-pressing end plate and magnetic steel, the position of end plate is positioned, so that the position of magnetic steel is stabilized without contacting magnetic steel, so that the respective fixation of motor shaft and magnetic steel position is guaranteed, the coaxiality of both during processing is guaranteed, and the initial dynamic balance performance of rotor is optimized.

[0024] (2) The rotor for a shielded pump of the utility model, the plastic filling piece adopts injection molding processing, is internally equipped with multiple hollow channels, avoids producing a large number of shrinkage holes in the processing process to influence the initial dynamic balance state, is helpful to optimizing the initial dynamic balance performance, and the baffle is arranged in the hollow channel to separate the two ends from each other and not communicate, prevents the condition that a single channel is too long, makes the length of the thimble in the two end channels correspondingly shorten in the injection molding processing, not only the structural strength is higher, is not easy to deform, and the coaxiality with the motor shaft is also higher, is favorable to optimizing the initial dynamic balance of the rotor.

[0025] (3) The rotor for a shielded pump of the utility model, the material of the end plate and the plastic filling piece is differentiated, the specific gravity of the material of the end plate is larger, the specific gravity of the material of the plastic filling piece is smaller, when the rotor dynamic balance needs to be adjusted and optimized again after processing is completed, coarse adjustment and fine adjustment can be realized in cooperation, and the condition that the weight is excessively removed is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is structure schematic diagram of the rotor of the shielded pump in the embodiment;

[0027] Figure 2 It is explosion structure schematic diagram of the rotor of the shielded pump in the embodiment;

[0028] Figure 3 It is Figure 1 Another view structure schematic diagram of the rotor of the shielded pump in the embodiment;

[0029] Figure 4 It is Figure 1 Sectional structure schematic diagram of the rotor of the shielded pump in the embodiment;

[0030] Figure 5 It is Figure 1 Left view view schematic diagram of the shielded pump in the embodiment.

[0031] Explanation of the reference numerals in the schematic diagram:

[0032] 100, rotor;110, motor shaft;120, magnetic steel;130, isolation cover;140, end plate;

[0033] 200, plastic filling piece;210, end cap portion;211, first hole site;212, second hole site;213, mark;214, separation rib plate;

[0034] 220, inner cylinder portion;221, baffle;222, first channel;223, second channel. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings.

[0036] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the limitation of the utility model.

[0037] In addition, it needs to explain that, unless otherwise expressly provided and limited, the term "installation", "connection", "connection" should be broad understanding, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through the intermediate medium, can be the communication inside two elements, the term "first", "second", "third", "fourth" should be broad understanding, only for distinguishing feature name, and not indicate the specific order relation. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0038] The utility model will be further described below in conjunction with examples.

[0039] Examples

[0040] In conjunction with Figures 1-5 As shown in the figure, the rotor of the shielding pump of the embodiment, the rotor 100 includes annular magnet steel 120, and the motor shaft 110 is arranged in the magnet steel 120 and coaxially arranged with the magnet steel 120, the magnet steel 120 and the motor shaft 110 are fixedly connected through the plastic filler 200, the outer periphery of the magnet steel 120 is provided with the isolating cover 130, the axial both ends of the magnet steel 120 are attached with annular end plate 140 respectively, the plastic filler 200 is closed from the outside of the end plate 140 and makes the end plate 140 close to the end surface of the magnet steel 120, and the end surface of the magnet steel 120 is completely sealed, at least one first hole site 211 is formed in the outer end surface of the plastic filler 200 at the axial end of the magnet steel 120, and the bottom of the first hole site 211 exposes the outer end surface of the end plate 140.

[0041] In practice, during the rotor processing, the isolation cover 130 is preassembled with the magnetic steel 120 by interference press-fitting, the end plate 140 is preassembled with the magnetic steel 120 by excessive press-fitting, the radial end face of the end plate 140 can basically cover the outer end face of the magnetic steel 120, and then the motor shaft 110, the end plate 140, the magnetic steel 120, and the isolation cover 130 are placed into an injection molding machine for integrated injection molding, forming a plastic filler 200, so that the inner cavity between the magnetic steel 120 and the motor shaft 110 and the end face position of the magnetic steel 120 are filled with the plastic filler 200, and the magnetic steel 120 is completely sealed and isolated. The end plate 140 is also fixed to the end face of the magnetic steel 120 by the plastic filler 200. During the injection molding process, the motor shaft 110 and the magnetic steel 120 are coaxially distributed and do not contact each other, and need to be positioned and fixed respectively, and if the magnetic steel 120 is directly supported and fixed at both ends, the surface of the magnetic steel 120 is easy to be damaged, affecting the performance of the rotor; and the coaxiality of the magnetic steel 120 and the motor shaft 110 is an important factor affecting the initial dynamic balance of the rotor. The end plate 140 is preassembled at both ends of the magnetic steel 120 in the embodiment, the position of the magnetic steel 120 can be fixed from both ends by the end plate 140 without contacting the surface of the magnetic steel 120, so as to ensure the initial position coaxiality with the motor shaft 110 and improve the initial dynamic balance performance of the rotor. The outer end face of the plastic filler 200 is provided with at least one first hole 211, that is, the first hole 211 is not filled with the plastic body during the injection molding process, and at the same time, space is reserved for the ejector pin of the injection molding machine. The ejector pin can be inserted into the outer end face of the end plate 140 through the first hole 211, so as to eject the rotor 100 from the injection molding machine.

[0042] In practice, the end plate 140 needs to not only satisfy the positioning and fixing of the magnetic steel 120, but also needs to have sufficient strength to prevent deformation. In the embodiment, the end plate 140 includes an end ring plate abutting against the end face position of the magnetic steel 120, and the axial thickness of the end ring plate is 1.5-2.5 mm, such as 1.5 mm, 1.8 mm, 2.0 mm, 2.5 mm, and the like, which satisfies the performance requirements and avoids significant increase in the weight of the rotor. Further optimization is that, in order to facilitate the preassembly and positioning of the end plate 140 and the magnetic steel 120, the inner side of the end ring plate of the end plate 140 is further provided with an embedded part extending towards the inner cavity of the magnetic steel 120, which is combined with Figure 4 As shown in FIG. 6, the embedded part of the end plate 140 is annularly matched and embedded in the magnetic steel 120, which is more convenient for the rapid positioning and installation of the end plate 140 and the magnetic steel 120.

[0043] As shown in FIG. 7, the embedded part of the end plate 140 is annularly matched and embedded in the magnetic steel 120, which is more convenient for the rapid positioning and installation of the end plate 140 and the magnetic steel 120. Figure 2 and Figure 4As shown, the plastic filling piece 200 is formed by injection molding in practice, and after molding, the plastic filling piece 200 includes an inner cylinder part 220 filled between the motor shaft 110 and the magnetic steel 120, and an end cover part 210 located at the axial both ends of the inner cylinder part 220 and capable of sealing the outer end surface of the end plate 140; the inner cylinder part 220 is provided with a hollow channel extending to both ends; the axial length of the hollow channel covers the axial length of the magnetic steel 120. The hollow design of the inner cylinder part 220 helps to avoid the shrinkage hole affecting the initial dynamic balance of the rotor in the injection molding process, thereby optimizing the initial dynamic balance. Further preferably, when the hollow channel has an extension length of not less than 2 cm, a partition plate 221 is arranged inside the hollow channel to separate the hollow channel into a first channel 222 and a second channel 223 which are not connected to each other in the length direction, so that both ends of the hollow channel are designed as a blind hole type. More preferably, the first channel 222 and the second channel 223 both extend in the axial direction of the inner cylinder part 220, and the partition plate 221 extends in the radial direction of the inner cylinder part 220. If the hollow channel is designed as a through hole, once the length of the channel is too long, the ejector pin at both ends needs to be punched through during the injection molding process. The length of the ejector pin is too long, which is easy to deform and break, and is also easy to deviate from the position, thereby affecting the coaxiality with the motor shaft 110, and also adversely affecting the initial dynamic balance of the rotor. Moreover, the blind hole design of the hollow channel also avoids the flash phenomenon that may occur when the ejector pin at both ends is punched through, avoids the problem of rotor jam caused by the falling of flash debris, and can improve the performance of the rotor in many aspects. More specifically, by arranging the partition plate 221 to shorten the length of the channels at both ends, the extension length of the first channel 222 and the second channel 223 is not more than 2 cm. In this way, the length of the ejector pin at both ends is correspondingly shortened during the injection molding process, which not only has higher structural strength and is not easy to deform, but also has higher coaxiality with the motor shaft 110, which is beneficial to optimize the initial dynamic balance of the rotor. Preferably, the partition plate 221 can be arranged centrally in the hollow channel of the inner cylinder part 220, and in practice, it can also be arranged non-centrally according to the processing needs.

[0044] In combination Figure 3As shown, one of the optional embodiments is that the hollow channel in the inner cylinder portion 220 includes a plurality of channels spaced apart along the circumferential direction, and adjacent hollow channels are separated by partition ribs 214, and the partition ribs 214 preferably extend along the axial direction of the inner cylinder portion 220, that is, the annular inner wall and the annular outer wall of the inner cylinder portion 220 are an annular hollow cavity, and the annular inner wall and the annular outer wall of the inner cylinder portion 220 are connected by a plurality of partition ribs 214, and preferably the plurality of partition ribs 214 are evenly spaced apart along the circumferential direction, and each partition rib 214 extends along the axial direction of the inner cylinder portion 220, so that the annular hollow cavity of the inner cylinder portion 220 is evenly divided into a plurality of hollow channels. Similarly, when the length of the inner cylinder portion 220 is longer, the above-mentioned partition 221 is provided in each hollow channel. The design of multiple hollow channels not only helps to avoid shrinkage holes that affect the initial dynamic balance of the rotor during the injection molding process, but the multiple partition ribs 214 can also enhance the structural strength of the plastic filler 200. When the rotor is working in a liquid medium, the hollow channel structure formed by the multiple partition ribs 214 is more conducive to promoting the agitation of the liquid medium, so as to accelerate the initial exhaust of the liquid medium and improve the shielding pump efficiency. In practice, the partition ribs 214 can also be distributed unevenly in the circumference, or not completely extend parallel to the axial direction in the inner cylinder 220, etc., and can be adjusted according to actual processing needs. On this basis, a further optimized design is that the end face heights of both ends of the partition rib 214 are lower than the outer end face height of the end cover portion 210 of the plastic filler 200. Specifically, the axial length of the partition rib 214 is less than the axial length of the plastic filler 200, combined with Figure 4 As shown, the end faces of the partition rib 214 are not flush with the outer end face of the end cover portion 210 of the plastic filler 200, but are slightly lower than the outer end face of the end cover portion 210 and indented inward. This helps to appropriately reduce the energy loss caused by the agitation of the liquid medium under normal working conditions after the initial exhaust of the shielded pump is completed, thereby reducing losses and improving efficiency.

[0045] It should be noted that this embodiment not only helps to improve the initial dynamic balancing performance of the rotor through the above-mentioned optimization, but also facilitates the timely re-adjustment and optimization of the dynamic balance of the rotor after the processing is completed, and can cooperate to achieve coarse adjustment and fine adjustment to avoid excessive weight removal. It can be preferably designed that the material specific gravity of the end plate 140 is greater than the material specific gravity of the plastic filler 200. For example, the end plate 140 can be made of a metal material such as copper, which has a specific gravity greater than the plastic material of the plastic filler 200. For openings of the same depth and size, the weight removal of the end plate 140 is obviously greater, and the weight removal on the plastic filler 200 is smaller. At this time, the main method of making holes in the end plate 140 to achieve coarse dynamic balancing adjustment can be to reduce the number of holes and the time of making holes. When the required weight removal is small, it is chosen to make holes one by one on the plastic filler 200 to ensure that the weight removal is not excessive.

[0046] Combine Figure 5As shown, the end cover part 210 of the plastic filler 200 is provided with at least one first hole position 211, and the internal end plate 140 can be leaked through the first hole position 211, so as to facilitate the hole drilling and weight removal of the end plate 140. Figure 5 As shown, two first hole positions 211 are symmetrically provided on both sides of the end cover part 210, which is not only beneficial to the uniform positioning of the end plate 140, but also facilitates uniform weight removal. When the weight removal amount still cannot meet the requirement, at least one second hole position 212 can be further provided on the end cover part 210 of the plastic filler 200, the position of the second hole position 212 is staggered with the position of the first hole position 211, and the hole diameter of the second hole position 212 is preferably smaller than the hole diameter of the first hole position 211. The small-diameter hole position is provided on the end cover part 210 to gradually increase the weight removal amount and avoid excessive weight removal. In practice, according to the requirement, the hole depth of the second hole position 212 can penetrate or not penetrate the axial thickness of the end cover part 210, and the position of the second hole position 212 is also adjusted according to the weight removal requirement.

[0047] In order to avoid the internal magnetic steel 120 from leaking out due to the hole drilling and punching, one of the optimized embodiments is that a mark 213 is circumferentially arranged on the outer end surface of the end cover part 210 of the plastic filler 200, and the mark 213 can adopt various forms such as an annular groove, a mark line, a mark protruding strip, etc. Figure 5 As shown, an annular groove is circumferentially provided on the outer end surface of the end cover part 210, and the first hole position 211 is arranged on the circumferential extension path of the mark 213; the mark 213 is used to indicate the distribution area of the second hole position 212 in the radial direction of the end cover part 210. Specifically, the distribution position of the mark 213 in the radial direction of the end cover part 210 does not exceed the radial distribution area of the internal end plate 140 of the end cover part 210, and the distribution position of the mark 213 in the radial direction of the end cover part 210 preferably corresponds to the radial center position of the end plate 140. Thus, when the hole is drilled, the hole is drilled along the track around the mark 213, even if the end cover part 210 is accidentally punched, the internal end plate 140 can further block the internal magnetic steel 120 from leaking out. In practice, the mark 213 can also be arranged at other positions, such as corresponding to the radial inner and outer edge areas of the end plate 140, etc., and the operator can know the area range of the weight removal hole drilling according to the position of the mark 213, so as to ensure that the hole drilling area does not exceed the radial area of the end plate 140, and the magnetic steel 120 will not be exposed.

[0048] The embodiment simultaneously provides a motor for a canned motor pump, which comprises the rotor for a canned motor pump as described above, and further comprises a stator assembly, which is circumferentially arranged outside the rotor 100 and is shielded and isolated by a shield cover between the stator assembly and the rotor 100.

[0049] The embodiment simultaneously provides a canned motor pump, which comprises a pump base, the pump base is provided with the motor for a canned motor pump as described above, and the output end of the motor shaft 110 is connected with an impeller assembly.

[0050] The specific structure of the shielded pump motor and the shielded pump is a conventional technology in the industry, which will not be described herein, and the embodiment effectively improves the dynamic balance of the rotor 100 by optimizing the structure of the rotor 100, thereby improving the use performance of the motor and the shielded pump.

[0051] The scope of protection of the utility model is limited by the claims. Thanks to the teaching of the utility model, those skilled in the art can easily recognize that the alternative structure of the disclosed structure of the utility model can be used as a feasible alternative embodiment, and the disclosed embodiments of the utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A rotor for a canned pump, comprising a circular annular magnet (120) and a motor shaft (110) disposed coaxially within the magnet (120), the magnet (120) and the motor shaft (110) being fixedly connected by a plastic filler (200), and an isolation cover (130) being sleeved on an outer periphery of the magnet (120). characterized in that Each of axial end faces of the magnet (120) is attached with a circular annular end plate (140), the plastic filler (200) seals the end plate (140) from an outside of the end plate (140) to tightly attach the end plate (140) to the end face of the magnet (120) and completely seal the end face of the magnet (120), and at least one first hole (211) is formed in an outer end face of the plastic filler (200) at an axial end of the magnet (120), and a bottom of the first hole (211) exposes an outer end face of the end plate (140).

2. A rotor for a canned pump according to claim 1, characterized in that: The plastic filler (200) comprises an inner cylinder portion (220) filled between the motor shaft (110) and the magnet (120), and an end cover portion (210) capable of sealing the outer end face of the end plate (140) at axial two ends of the inner cylinder portion (220), a hollow channel is formed in the inner cylinder portion (220) and extends to both ends, the hollow channel has a length of not less than 2 cm, and a partition plate (221) is arranged in the hollow channel to divide the hollow channel into a first channel (222) and a second channel (223) which are not connected to each other along a length direction.

3. A rotor for a canned pump according to claim 2, characterized in that: The first channel (222) and the second channel (223) each have a length of not more than 2 cm.

4. A rotor for a canned pump according to any one of claims 1-3, characterized in that: The end plate (140) has a material specific gravity greater than that of the plastic filler (200).

5. A rotor for a canned pump according to claim 4, characterized in that: The end plate (140) is made of copper, and the plastic filler (200) is integrally injection molded.

6. A rotor for a canned pump according to any one of claims 1-3, characterized in that: The end plate (140) comprises an end ring plate attached to a position of the end face of the magnet (120), and an axial thickness of the end ring plate is 1.5-2.5 mm.

7. A rotor for a canned pump according to claim 6, characterized in that: An inner embedding portion extending into an inner cavity of the magnet (120) is further arranged in an inner side of the end ring plate of the end plate (140), and the inner embedding portion is annularly fitted into the magnet (120).

8. A rotor for a canned pump according to claim 2, characterized in that: At least one second hole (212) is further formed in the end cover portion (210) of the plastic filler (200), and a position of the second hole (212) is staggered with a position of the first hole (211).

9. A rotor for a canned pump according to claim 8, characterized in that: An outer end face of the end cover portion (210) of the plastic filler (200) is further provided with a mark (213) circumferentially arranged thereon, the first hole (211) is arranged on a circumferential extension path of the mark (213), and the mark (213) can indicate a distribution area of the second hole (212) in a radial direction of the end cover portion (210).

10. A rotor for a canned pump according to claim 2, characterized in that: The hollow channel in the inner cylinder portion (220) of the plastic filler (200) comprises a plurality of channels spaced apart along a circumferential direction, adjacent hollow channels are separated by a separation rib plate (214), the separation rib plate (214) extends along an axial direction of the inner cylinder portion (220), and both end face heights of the separation rib plate (214) are lower than an outer end face height of the end cover portion (210) of the plastic filler (200).

11. A motor for a canned pump, characterized by: The rotor for a canned pump has a stator assembly arranged around the outer periphery of the rotor, and a shield is arranged between the stator assembly and the rotor.

12. A canned pump characterized by: The motor for a canned pump has a motor shaft (110) output end connected with an impeller assembly.

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