Motor rotor assembly, motor and shield pump

Abstract

The utility model discloses a motor rotor assembly, a motor and a shield pump, the motor rotor assembly comprises a rotating shaft and a magnet, the magnet is sleeved on the rotating shaft, a first end plate and a second end plate are sleeved on the rotating shaft, and the first end plate and the second end plate are respectively covered on two ends of the magnet. The outer side of the magnet is further sleeved with a rotor shielding sleeve at least covering the circumferential surface of the magnet, and the rotor shielding sleeve is connected with the first end plate and the second end plate in a welded mode in the circumferential direction. The rotor shielding sleeve is connected with the first end plate and the second end plate in a welded mode, so that the magnet is located in the sealed cavity defined by the rotor shielding sleeve, the first end plate and the second end plate, and liquid media around the rotor are prevented from making contact with the magnet and corroding the magnet. The motor rotor assembly is simple in structure and good in sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of pumping device technology, specifically to a motor rotor assembly, a motor, and a canned pump. Background Technology

[0002] A canned motor pump is a seal-free pump used to transport liquids. The pump body and motor are sealed, and the shielding structure isolates the internal components of the motor stator and rotor from the transported medium to prevent leakage.

[0003] Existing canned motor pumps include a shielding sleeve assembly with a liquid medium flowing through it. The rotor assembly is immersed in the liquid medium inside the shielding sleeve assembly. This places high demands on the sealing performance of the rotor assembly. In related canned motor pumps, poor sealing performance of the rotor assembly often leads to the liquid medium inside the shielding sleeve assembly penetrating into the magnet, causing the magnet to rust, corrode, and squeeze the rotor shielding sleeve. This results in noise and scraping during rotor assembly rotation, affecting motor performance and even causing the motor to malfunction.

[0004] Therefore, it is essential to design a motor rotor assembly with good sealing performance. Utility Model Content

[0005] To address the aforementioned deficiencies in the prior art, this application provides a motor rotor assembly, a motor, and a canned pump. The motor rotor assembly has a simple structure and good sealing performance.

[0006] Firstly, in order to achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0007] An electric motor rotor assembly includes a shaft and a magnet. The magnet is sleeved on the shaft. A first end plate and a second end plate are also sleeved on the shaft. The first end plate and the second end plate are respectively covering the two ends of the magnet. A rotor shielding sleeve that at least covers the circumferential surface of the magnet is also sleeved on the outside of the magnet. The rotor shielding sleeve is welded to the first end plate and the second end plate in the circumferential direction.

[0008] In this technical solution, the magnet is sandwiched between a first end plate and a second end plate on both sides of the magnet to prevent the liquid medium from contacting the magnet from both sides. A rotor shielding sleeve is provided on the circumferential surface of the magnet to prevent the liquid medium from contacting the magnet from the circumferential surface. The rotor shielding sleeve, the first end plate, and the second end plate are welded together to place the magnet in a sealed cavity formed by the rotor shielding sleeve, the first end plate, and the second end plate, preventing the liquid medium around the rotor from contacting the magnet and corroding it. The motor rotor assembly of this application has a simple structure and good sealing effect.

[0009] Preferably, a magnet mounting base is further provided between the rotating shaft and the magnet, the magnet mounting base being sleeved on the rotating shaft, and the magnet being sleeved on the magnet mounting base. By providing a magnet mounting base between the magnet and the rotating shaft, direct contact between the liquid medium and the magnet is prevented when it seeps in along the joint of the rotating shaft.

[0010] Preferably, the magnet mounting base has mounting grooves at both ends that communicate with the rotating shaft, and a sealing element that is sealed to the rotating shaft is disposed in the mounting groove. By providing sealing rings at both ends of the magnet mounting base, liquid medium is prevented from entering the magnet from the connection with the rotating shaft, thereby improving the sealing effect.

[0011] Preferably, the rotating shaft is provided with a limiting groove, and the magnet mounting base is provided with a positioning block that mates with the limiting groove. The positioning block is located within the limiting groove to restrict the rotation of the magnet mounting base relative to the rotating shaft. By providing limiting mechanisms on the rotating shaft and the magnet mounting base, the rotation of the magnet mounting base relative to the rotating shaft is prevented.

[0012] Preferably, the magnet is injection molded and forms an integral structure with the rotating shaft. Making the magnet and rotating shaft an integral structure improves the connection strength between them and extends their service life.

[0013] Preferably, both the first end plate and the second end plate are welded to the rotating shaft in the circumferential direction. By welding the first end plate and the second end plate to the rotating shaft at their circumferential connections, the connection strength and sealing effect between the first end plate, the second end plate, and the rotating shaft are improved.

[0014] Preferably, the rotor shielding sleeve at least partially covers the circumferential surfaces of the first end plate and the second end plate. This partial coverage facilitates welding the rotor shielding sleeve to the first and second end plates.

[0015] Preferably, the rotating shaft has flow holes extending through both ends, and filters are installed within the flow holes. By providing flow holes within the rotating shaft, the liquid medium can flow through the shaft, thereby reducing the temperature of the rotor assembly and improving heat dissipation performance. The filters within the flow holes prevent impurities in the liquid medium from entering the rotor assembly and affecting its normal operation.

[0016] Secondly, to achieve the aforementioned objectives, this utility model also proposes an electric motor, comprising a housing, a stator assembly, a shielding sleeve assembly, a bracket cover assembly, and a rotor assembly, wherein the rotor assembly is configured as described in any one of the above technical solutions. The reasoning process for the beneficial effects of the electric motor provided in this application and the aforementioned electric motor rotor assembly is similar, and will not be repeated here.

[0017] Thirdly, to achieve the aforementioned objectives, this utility model also proposes a canned motor pump, comprising a pump body and a motor, wherein the motor is configured as described in the above technical solution. The reasoning process for the beneficial effects of the canned motor pump provided in this application is similar to that of the aforementioned motor rotor assembly, and will not be repeated here.

[0018] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this invention. In addition, each of these features, elements and components appearing in the following text and drawings has multiple components and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the motor rotor assembly in this embodiment;

[0021] Figure 2 This is an exploded view of the motor rotor assembly in this embodiment;

[0022] Figure 3 yes Figure 1 Sectional view along the AA direction;

[0023] Figure 4 This is a schematic diagram of a magnet mounting base structure according to this embodiment;

[0024] Figure 5 This is a cross-sectional schematic diagram of the motor in this embodiment;

[0025] Figure 6 This is a cross-sectional schematic diagram of the shielded pump in this embodiment.

[0026] Among them, 110 is the rotating shaft; 111 is the flow hole; 112 is the filter; 113 is the limiting groove; 120 is the magnet; 130 is the first end plate; 140 is the second end plate; 150 is the rotor shielding sleeve; 160 is the magnet mounting base; 161 is the mounting groove; 162 is the seal; 163 is the positioning block; 164 is the limiting protrusion; 200 is the motor housing; 300 is the stator assembly; 400 is the shielding sleeve assembly; 500 is the bracket cover assembly; 600 is the pump body; and 700 is the impeller. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain the invention and should not be construed as limiting the scope of this utility model.

[0028] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0029] Example:

[0030] like Figures 1 to 4 As shown, this embodiment proposes a motor rotor assembly, including a rotating shaft 110 and a magnet 120. The rotating shaft 110 has a cylindrical structure and is made of high-strength and wear-resistant ceramic or metal material. The magnet 120 is sleeved on the rotating shaft 110. In this embodiment, the magnet 120 is a magnetic ring. The rotating shaft 110 is also sleeved with a first end plate 130 and a second end plate 140. The first end plate 130 and the second end plate 140 are circular in shape corresponding to the rotating shaft 110 and the magnetic ring, and are made of corrosion-resistant metal material. The first end plate 130 and the second end plate 140 are respectively covered at both ends of the magnet 120. The outside of the magnet 120 is also sleeved with a rotor shielding sleeve 150 that at least covers the circumferential surface of the magnet 120. The rotor shielding sleeve 150 is welded to the first end plate 130 and the second end plate 140 in the circumferential direction. Specifically, the cross-sectional shapes of the magnetic ring, the first end plate 130, and the second end plate 140 are the same or similar, so that the first end plate 130, the magnet 120, and the second end plate 140 can be combined into a hollow cylinder and fitted onto the rotating shaft 110. Then, by fitting a rotor shielding sleeve 150 onto the circumferential surface of the first end plate 130, the magnet 120, and the second end plate 140, the magnet 120 is enclosed in a sealed space formed by the rotor shielding sleeve 150, the first end plate 130, and the second end plate 140, which prevents the magnet 120 from being corroded by the liquid medium, improves operational stability, and extends service life.

[0031] In this embodiment, the magnet 120 is sandwiched between a first end plate 130 and a second end plate 140 on both sides of the magnet 120, preventing liquid medium from contacting the magnet 120 from both sides. A rotor shielding sleeve 150 is provided on the circumferential surface of the magnet 120, preventing liquid medium from contacting the magnet 120 from the circumferential surface. The rotor shielding sleeve 150, the first end plate 130, and the second end plate 140 are welded together, so that the magnet 120 is located in a sealed cavity formed by the rotor shielding sleeve 150, the first end plate 130, and the second end plate 140, preventing liquid medium around the rotor from contacting and corroding the magnet 120. The motor rotor assembly of this application has a simple structure and good sealing effect.

[0032] In some embodiments, such as Figure 2 , 3 As shown, a magnet mounting base 160 is also provided between the rotating shaft 110 and the magnet 120. The magnet mounting base 160 is sleeved on the rotating shaft 110, and the magnet 120 is sleeved on the magnet mounting base 160. By providing the magnet mounting base 160 between the magnet 120 and the rotating shaft 110, direct contact between the liquid medium and the magnet 120 is prevented when it seeps in along the connection of the rotating shaft 110. Both the magnet mounting base 160 and the magnet 120 are of this type. It should be noted that the accompanying drawings in this embodiment show the installation structure of the magnet 120 sleeved on the magnet mounting base 160. In other embodiments, the magnet 120 can also be directly mounted on the rotating shaft 110.

[0033] In some embodiments, such as Figure 3 , 4 As shown, the magnet mounting base 160 has mounting grooves 161 at both ends that communicate with the rotating shaft 110. Each mounting groove 161 contains a sealing element 162 that is sealed to the rotating shaft 110. The sealing element 162 is a sealing ring. By providing sealing rings at both ends of the magnet mounting base 160, liquid media are prevented from entering the magnet 120 from the connection point with the rotating shaft 110, thus improving the sealing effect.

[0034] In some embodiments, such as Figure 2 , 4As shown, the rotating shaft 110 is provided with a limiting groove 113, and the magnet mounting base 160 is provided with a positioning block 163 that cooperates with the limiting groove 113. The positioning block 163 is located within the limiting groove 113 to restrict the rotation of the magnet mounting base 160 relative to the rotating shaft 110. Several limiting protrusions 164 are also provided at both ends of the magnet mounting base 160 to prevent the magnet 120 from detaching from both ends of the magnet mounting base 160 when the magnet 120 is mounted on it. By providing limiting mechanisms on the rotating shaft 110 and the magnet mounting base 160, the movement of the magnet 120 within the magnet mounting base 160 and the rotation of the magnet mounting base 160 relative to the rotating shaft 110 are prevented. Through the above-mentioned limiting devices, a stable connection is formed between the magnet 120, the magnet mounting base 160, and the rotating shaft 110. Specifically, the magnet mounting base 160 is formed into an integral structure with the rotating shaft 110 by injection molding.

[0035] In some embodiments, both the magnet 120 and the magnet mounting base 160 are injection molded and form an integral structure with the rotating shaft 110. Specifically, the steps include: first, the magnet mounting base 160 is injection molded onto the surface of the rotating shaft 110, forming an integral structure with the rotating shaft 110; then, the magnet 120 is injection molded onto the magnet mounting base 160, thus forming an integral structure with the magnet 120, the magnet mounting base 160, and the rotating shaft 110. It should be noted that in other embodiments, the magnet 120 is injection molded and forms an integral structure with the rotating shaft 110. Setting the magnet 120, the magnet mounting base 160, and the rotating shaft 110 as an integral structure improves the connection strength between the magnet 120 and the rotating shaft 110 and extends their service life.

[0036] In some embodiments, such as Figures 1 to 4 As shown, the first end plate 130 and the second end plate 140 are both welded to the rotating shaft 110 in the circumferential direction. In this embodiment, the welding connection is laser welding. By welding the first end plate 130 and the second end plate 140 to the rotating shaft 110 at the circumferential connection, the connection strength and sealing effect of the first end plate 130 and the second end plate 140 to the rotating shaft 110 are improved.

[0037] In some embodiments, such as Figure 1 , 3As shown, the rotor shielding sleeve 150 at least partially covers the circumferential surfaces of the first end plate 130 and the second end plate 140. In this embodiment, the rotor shielding sleeve 150 completely covers the circumferential surfaces of the first end plate 130 and the second end plate 140, ensuring a stable welded connection between the rotor shielding sleeve 150 and the first end plate 130 and the second end plate 140. In other embodiments, the rotor shielding sleeve 150 may also partially cover the end faces of the first end plate 130 and the second end plate 140, and the rotor shielding sleeve 150 is welded to the end faces of the first end plate 130 and the second end plate 140. The rotor shielding sleeve 150 at least partially covers the first end plate 130 and the second end plate 140, facilitating welding of the rotor shielding sleeve 150 to the first end plate 130 and the second end plate 140.

[0038] In some embodiments, such as Figure 3 As shown, the rotating shaft 110 has flow holes 111 extending through both ends, and a filter 112 is installed inside the flow holes 111. By providing flow holes 111 inside the rotating shaft 110, the liquid medium can flow through the rotating shaft 110, thereby reducing the temperature of the rotor assembly and improving heat dissipation performance. The filter 112 installed inside the flow holes 111 is used to prevent impurities in the liquid medium from entering the rotor assembly and affecting the normal operation of the rotor assembly.

[0039] In addition, such as Figure 5 As shown, this embodiment also proposes a motor, including a motor housing 200, a stator assembly 300, a shielding sleeve assembly 400, a bracket cover assembly 500, and a rotor assembly. The housing is formed as a cavity with one open end. The stator assembly 300 and the shielding sleeve assembly 400 are disposed within the cavity. The rotor assembly is located within the shielding sleeve assembly 400. The bracket cover assembly 500 covers the openings of the housing and the shielding sleeve assembly 400. One end of the rotor shaft 110 of the rotor assembly extends through the bracket cover. The rotor assembly is configured as the motor rotor assembly as described in any of the above embodiments. Both the shielding sleeve assembly 400 and the bracket cover assembly 500 are provided with fixed bearings for fixing the shaft 110, which can effectively support the rotor assembly to rotate under the action of an electromagnetic field and drive the impeller to rotate through the rotor assembly. At the same time, the shielding sleeve assembly 400 isolates the liquid medium from the motor, thereby protecting the motor. The reasoning process for the beneficial effects of the motor provided in this embodiment is similar to that of the aforementioned motor rotor assembly, and will not be repeated here.

[0040] In addition, such as Figure 6As shown, this embodiment also proposes a canned motor pump, including a pump body 600 and a motor. The pump body 600 is fixedly connected to the motor. An impeller is provided on the rotor shaft 110 of the rotor assembly, and the impeller is located inside the pump body 600. The motor is the same as that described in the above embodiment. The reasoning process for the beneficial effects of the canned motor pump provided in this embodiment is similar to that of the aforementioned motor rotor assembly, and will not be repeated here.

[0041] In summary, by welding the rotor shielding sleeve 150, the first end plate 130, and the second end plate 140 together, the magnet 120 is located in a sealed cavity formed by the rotor shielding sleeve 150, the first end plate 130, and the second end plate 140, preventing the liquid medium around the rotor from contacting and corroding the magnet 120. The sealing effect is further improved by setting the magnet mounting base 160 and the sealing element 162. The motor rotor assembly of this embodiment has a simple structure and a good sealing effect.

[0042] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this invention will be included within the scope of the claims.

Claims

1. A motor rotor assembly, comprising a shaft (110) and a magnet (120), characterized in that, The magnet (120) is sleeved on the rotating shaft (110). The rotating shaft (110) is also sleeved with a first end plate (130) and a second end plate (140). The first end plate (130) and the second end plate (140) are respectively covered at both ends of the magnet (120). The outside of the magnet (120) is also sleeved with a rotor shielding sleeve (150) that at least covers the circumferential surface of the magnet (120). The rotor shielding sleeve (150) is welded to the first end plate (130) and the second end plate (140) in the circumferential direction.

2. The motor rotor assembly according to claim 1, characterized in that, A magnet mounting base (160) is also provided between the rotating shaft (110) and the magnet (120). The magnet mounting base (160) is sleeved on the rotating shaft (110), and the magnet (120) is sleeved on the magnet mounting base (160).

3. The motor rotor assembly according to claim 2, characterized in that, The magnet mounting base (160) has mounting grooves (161) at both ends that communicate with the rotating shaft (110), and a sealing element (162) that is sealed to the rotating shaft (110) is provided in the mounting groove (161).

4. The motor rotor assembly according to claim 3, characterized in that, The rotating shaft (110) is provided with a limiting groove, and the magnet mounting base (160) is provided with a positioning block (163) that cooperates with the limiting groove. The positioning block (163) is located in the limiting groove to restrict the magnet mounting base (160) from rotating relative to the rotating shaft (110).

5. The motor rotor assembly according to claim 1, characterized in that, The magnet (120) is formed by injection molding and forms an integral structure with the rotating shaft (110).

6. The motor rotor assembly according to any one of claims 1 to 5, characterized in that, The first end plate (130) and the second end plate (140) are both welded to the rotating shaft (110) in the circumferential direction.

7. The motor rotor assembly according to any one of claims 1 to 5, characterized in that, The rotor shield (150) at least partially covers the circumferential surfaces of the first end plate (130) and the second end plate (140).

8. The motor rotor assembly according to any one of claims 1 to 5, characterized in that, The rotating shaft (110) is provided with a flow hole (111) that extends through both ends of the shaft, and a filter (112) is provided in the flow hole (111).

9. An electric motor, comprising a motor housing (200), a stator assembly (300), a shielding sleeve assembly (400), a bracket cover assembly (500), and a rotor assembly, characterized in that, The rotor assembly is configured as a motor rotor assembly as described in any one of claims 1 to 8.

10. A canned motor pump, comprising a pump body (600) and a motor, characterized in that, The motor is configured as described in claim 9.

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