Mounting sleeve, motor and pump

Abstract

The present disclosure relates to a mounting sleeve for mounting a rotor on a rotor shaft, a motor, and a pump, the mounting sleeve comprising: a side wall including: an inner circumferential surface; an outer peripheral surface; the mounting sleeve comprises an inner circumferential surface and an outer circumferential surface, and a plurality of bulges, the plurality of bulges are positioned on the inner circumferential surface and / or the outer circumferential surface, and the plurality of bulges are arranged around the circumferential direction of the mounting sleeve; the side wall is of a closed integrated structure in the circumferential direction. The motor comprises a rotor shaft, a rotor and the mounting sleeve, the inner circumferential surface of the mounting sleeve is in interference fit with the outer circumferential surface of the rotor shaft, and the outer circumferential surface of the mounting sleeve is in interference fit with the inner circumferential surface of the rotor. The pump comprises the motor.

Description

Technical Field

[0001] The present disclosure relates to the field of motor technology, in particular to a mounting sleeve, a motor and a pump. Background Art

[0002] The motor usually includes a fixed stator and a rotating rotor arranged inside the stator. When assembling the motor, the rotor needs to be mounted on the rotor shaft, and the rotor shaft is rotatably supported inside the motor housing. When the rotor rotates, the fixed mechanical connection between the rotor and the rotor shaft will cause the rotor shaft to rotate. Commonly, the rotor and the rotor shaft are fixedly connected by an interference fit. However, when the rotor is in direct contact with the rotor shaft, there is hard extrusion between the two, which can easily break or crack the rotor shaft. Therefore, a mounting sleeve is usually installed between the rotor and the rotor shaft, and a plurality of protrusions are arranged on the inner surface and / or outer surface of the mounting sleeve. When the mounting sleeve is installed between the rotor and the rotor shaft, these protrusions act like springs, so that the rotor and the rotor shaft are tightly connected together, and can absorb certain tolerances.

[0003] In the manufacturing process of a known mounting sleeve, a protrusion is first punched on a plate, and then the plate is rolled into a mounting sleeve, and the rolled mounting sleeve has an axially extending slit or opening. This mounting sleeve has the following problems:

[0004] The presence of the slit or opening makes it easy for the rotor shaft to shift toward the position of the slit or opening when the mounting sleeve is assembled on the rotor shaft, thereby reducing the concentricity of the mounting sleeve and the rotor shaft. In order to improve the concentricity, it is generally necessary to add an additional step of fine turning the outer circle after assembly, which reduces production efficiency and increases production costs. Utility Model Content

[0005] An object of the present disclosure is to provide a mounting sleeve which does not have the above-mentioned drawbacks.

[0006] To achieve this object, the present disclosure provides a mounting sleeve for mounting a rotor on a rotor shaft, wherein the mounting sleeve comprises: a side wall, wherein the side wall comprises: an inner circumferential surface; an outer circumferential surface; and a protrusion, wherein there are multiple protrusions, multiple protrusions are located on the inner circumferential surface and / or the outer circumferential surface, and multiple protrusions are arranged in a circumferential direction around the mounting sleeve; wherein the side wall is a closed, integrated structure in the circumferential direction.

[0007] Compared with the prior art, the side wall of the mounting sleeve in the present invention is a closed integral structure in the circumferential direction without seams or openings, thereby avoiding the problem of rotor shaft deviation and decreased concentricity during assembly due to the presence of seams or openings.

[0008] A further object of the present disclosure is to provide an electric machine which does not have the above mentioned drawbacks.

[0009] To achieve this object, the present disclosure provides a motor, which includes a rotor shaft, a rotor and the above-mentioned mounting sleeve, wherein the inner circumference of the mounting sleeve is interference fit with the outer circumference of the rotor shaft, and the outer circumference of the mounting sleeve is interference fit with the inner circumference of the rotor.

[0010] The advantages described above for the mounting sleeve also apply to the electric motor.

[0011] A further object of the present disclosure is to provide a pump which does not have the above mentioned drawbacks.

[0012] To achieve this object, the present disclosure provides a pump, which includes the above-mentioned motor.

[0013] The advantages described above for the mounting sleeve and the motor also apply to the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a rotor shaft, mounting sleeve and bushing provided for an embodiment of the present disclosure.

[0015] Figure 2 for Figure 1 Schematic diagram of the middle end.

[0016] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0017] Figure 4 A schematic diagram of a mounting sleeve provided for an embodiment of the present disclosure.

[0018] Figure 5 A schematic diagram of manufacturing a mounting sleeve from a pipe is provided for an embodiment of the present disclosure.

[0019] Reference numerals:

[0020] 1. Rotor shaft; 2. Mounting sleeve; 21. Protrusion; 22. Groove; 3. Bushing; 4. Pipe. DETAILED DESCRIPTION

[0021] The technical solution of the present disclosure is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings, rather than all of them.

[0022] Some directional words are defined in the present disclosure. Unless otherwise stated, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of the present disclosure.

[0023] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0025] The motor (not shown) can be applied in various scenarios, for example, it can be applied in a pump (not shown) to drive the impeller of the pump to rotate.

[0026] The motor generally includes a fixed stator (not shown) and a rotating rotor arranged inside the stator. The rotor is fixedly connected to a rotor shaft so that when the rotor rotates, the rotor shaft is driven to rotate.

[0027] The overall structure and design of the stator are well known, and this embodiment does not involve improvements to the stator, so the structure of the stator will not be described in detail.

[0028] The overall structure and design of the rotor are also well known. For the purpose of simplicity, only the sleeve of the rotor is shown herein.

[0029] like Figure 1 and Figure 2 As shown, the mounting sleeve 2 is mounted between the outer circumference of the rotor shaft 1 and the inner circumference of the sleeve 3 .

[0030] like Figure 2 and Figure 3 As shown, a portion of the inner circumference of the mounting sleeve 2 abuts against the outer circumference of the rotor shaft 1, thereby achieving an interference fit between the mounting sleeve 2 and the rotor shaft 1. Similarly, a portion of the outer circumference of the mounting sleeve 2 abuts against the inner circumference of the shaft sleeve 3, thereby achieving an interference fit between the mounting sleeve 2 and the shaft sleeve 3.

[0031] like Figure 4As shown, the mounting sleeve 2 is roughly cylindrical. The mounting sleeve 2 is a thin-walled part, having a side wall, and the wall thickness of the side wall is about 0.5 mm.

[0032] like Figure 4 As shown, a plurality of protrusions 21 and a plurality of grooves 22 are provided on the inner circumference and / or the outer circumference of the side wall. Figure 2 As shown, the protrusions 21 on the inner circumference correspond to the grooves 22 on the outer circumference, and the protrusions 21 on the outer circumference correspond to the grooves 22 on the inner circumference. Thus, when the inner circumference and / or outer circumference of the side wall is subjected to radial force, the structure of the side wall allows the mounting sleeve 2 to deform to a certain extent.

[0033] The number of protrusions 21 may be 4-16, for example Figure 2 A mounting sleeve 2 having ten protrusions 21 is shown in FIG.

[0034] The protrusions 21 may be evenly arranged in a circumferential direction around the side wall.

[0035] The cross section of the protrusion 21 may be substantially in the shape of an arc.

[0036] like Figure 4 As shown, in this embodiment, both the inner circumferential surface and the outer circumferential surface of the mounting sleeve 2 have protrusions 21, the protrusions 21 on the outer circumferential surface are defined as peaks, and the protrusions 21 on the inner circumferential surface are defined as valleys, wherein the peaks extend outward from the outer circumferential surface of the mounting sleeve 2, and the valleys extend inward from the inner circumferential surface of the mounting sleeve 2 toward the center of the mounting sleeve 2.

[0037] When the installation sleeve 2 is installed in the sleeve 3, the peak portion contacts the inner circumferential surface of the sleeve 3. When the installation sleeve 2 is installed on the rotor shaft 1, the valley portion contacts the rotor shaft 1.

[0038] The wavy shape of the mounting sleeve 2 will allow the mounting sleeve 2 to act as a form of spring. When the mounting sleeve 2 is pressed together with the sleeve 3 part onto the rotor shaft 1, the distance between the valleys and the peaks will change, in particular decrease. This allows the mounting sleeve 2 to adapt to any manufacturing tolerances that may exist in the rotor shaft 1 and / or the sleeve 3 and / or the mounting sleeve 2.

[0039] During the assembly of the rotor shaft 1, the mounting sleeve 2 and the sleeve 3, the mounting sleeve 2 is first inserted into the hollow portion of the sleeve 3, and then the mounting sleeve 2 and the sleeve 3 are press-fitted onto the rotor shaft 1. Due to the form of the mounting sleeve 2, the mounting sleeve 2 will deform slightly to absorb any tolerances and ensure a tight friction fit between the rotor shaft 1 and the sleeve 3.

[0040] like Figure 4As shown, unlike the mounting sleeve in the prior art, the side wall of the mounting sleeve 2 in the present disclosure is a closed integral structure in the circumferential direction without seams or openings, thereby avoiding the problem of the rotor shaft 1 being offset and the concentricity being reduced during the assembly process due to the presence of seams or openings.

[0041] like Figure 5 As shown, in order to obtain the installation sleeve 2 of the present disclosure, it can be formed by stamping the tube 4, instead of being formed by rolling a metal sheet as in the prior art.

[0042] The material of the pipe 4 can be 304 stainless steel.

[0043] The method for punching the tube 4 and the mold used are both prior art and will not be described in detail here.

[0044] The roundness of the tube 4 can be controlled relatively easily, so the installation sleeve 2 obtained by stamping the tube 4 has correspondingly good roundness. Compared with the installation sleeve formed by rolling in the prior art, the installation sleeve 2 disclosed in the present invention is not easy to deform and can avoid the problem of large ovality.

[0045] That is to say, the mounting sleeve 2 disclosed in the present invention also solves the following technical problem: the mounting sleeve will be deformed after being rolled, and the cross section will be deformed from a circle to an ellipse. When the mounting sleeve is assembled on the rotor shaft, the rotor shaft is easily squeezed at certain positions, increasing the risk of the rotor shaft breaking.

[0046] like Figure 4 As shown, a plurality of protrusions 21 on the side wall form a protrusion group, and the protrusions in the protrusion group extend continuously and uninterruptedly along the axial direction of the side wall. There is only one protrusion group on the mounting sleeve 2 of the present disclosure, and all the protrusions 21 of the present disclosure can be formed in one stamping step, thereby ensuring the molding accuracy of each protrusion 21.

[0047] Compared with the mounting sleeve in the prior art having more than two protrusion groups spaced apart in the axial direction, the mounting sleeve 2 disclosed in the present invention solves the problem that multiple protrusion groups need to be stamped multiple times, resulting in inconsistent depths of protrusions 21 in different protrusion groups.

[0048] Since the molding accuracy of the protrusion 21 disclosed in the present invention is guaranteed, after the installation sleeve 2 is interference-fitted with the rotor shaft 1, the depth of the line marks formed by the protrusion 21 on the rotor shaft 1 is more uniform, and the product consistency and clamping force are guaranteed.

[0049] like Figure 4 As shown, one end of the protrusion 21 can be located at one end of the mounting sleeve 2. Specifically, Figure 4In the embodiment, the left end of the protrusion 21 is located at the left end of the mounting sleeve 2, and the right end of the protrusion 21 is located at the right end of the mounting sleeve 2, so that there can only be one protrusion group on the mounting sleeve 2.

[0050] like Figure 4 As shown, the protrusion 21 can extend straight along the axial direction of the mounting sleeve 2, so as to have a substantially straight shape, which is relatively economical in terms of manufacturing cost, and the mold required for stamping can be manufactured in a relatively simple manner; from the perspective of assembly, the linear protrusion 21 has a relatively small area, which facilitates the assembly process. However, in other embodiments not shown, the protrusion 21 can have different shapes, such as a spiral shape, etc.

[0051] In the prior art, 5 installation sleeves of the same production batch are randomly selected for assembly. In the present disclosure, 5 installation sleeves of the same production batch are randomly selected for assembly. The comparison results are shown in the following table:

[0052]

[0053]

[0054] In summary, the mounting sleeve 2 disclosed in the present invention has the following advantages:

[0055] 1. The mounting sleeve 2 of the present invention is a closed structure after molding, which improves the problems of extrusion rebound and ceramic shaft deviation during assembly of the open structure in the prior art, and greatly improves the concentricity. After the mounting sleeve 2 of the present invention is used, the assembly concentricity meets the relevant requirements, and there is no need to perform fine turning on the sleeve 3, which effectively improves the production efficiency and reduces the production cost.

[0056] 2. The mounting sleeve 2 disclosed in the present invention is formed by stamping a tube 4 instead of rolling it after stamping a sheet material, so that the mounting sleeve 2 has a better roundness after forming, thereby improving the problems in the prior art that the mounting sleeve has a large ovality, is difficult to assemble, and is easy to damage the rotor shaft 1 during assembly.

[0057] 3. The installation sleeve 2 disclosed in the present invention has only one protrusion group, and all the protrusions 21 can be obtained by only one stamping, so that the depth of the protrusions 21 is consistent. After interference fit with the rotor shaft 1, the line marks on the rotor shaft 1 are more uniform, and the product consistency and clamping force are guaranteed.

[0058] The above is a description of the embodiments of the present disclosure. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present disclosure. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A mounting sleeve, used to mount the rotor on the rotor shaft, characterized in that: The mounting sleeve (2) comprises: A side wall, the side wall comprising: Inner circumference; The outer surface; and A protrusion (21), wherein there are a plurality of protrusions (21), the plurality of protrusions (21) are integrally formed on the inner peripheral surface and / or the outer peripheral surface, and the plurality of protrusions (21) are arranged in a circumferential direction around the side wall; Wherein, the side wall is a closed integral structure in the circumferential direction.

2. The mounting sleeve according to claim 1, characterized in that The installation sleeve (2) is formed by stamping a tube (4).

3. The mounting sleeve according to claim 1 or 2, characterized in that: The plurality of protrusions (21) form a protrusion group, each protrusion in the protrusion group extends continuously and uninterruptedly, and the side wall has only one protrusion group.

4. The mounting sleeve according to claim 1 or 2, characterized in that: One end of the protrusion (21) is located at one end of the side wall.

5. The mounting sleeve according to claim 4, characterized in that: The two ends of the protrusion (21) are respectively located at the two ends of the side wall.

6. The mounting sleeve according to claim 4, characterized in that The protrusion (21) extends linearly along the axial direction of the side wall.

7. The mounting sleeve according to claim 1 or 2, characterized in that: The number of the protrusions (21) is 4-16; and / or The protrusions (21) are evenly arranged in a circumferential direction around the side wall; and / or The cross section of the protrusion (21) is in the shape of an arc.

8. The mounting sleeve according to claim 1 or 2, characterized in that: The inner circumferential surface and / or the outer circumferential surface of the side wall has a groove (22), the groove (22) located on the outer circumferential surface corresponds to the protrusion (21) located on the inner circumferential surface, and the groove (22) located on the inner circumferential surface corresponds to the protrusion (21) located on the outer circumferential surface.

9. A motor, characterized in that The motor comprises a rotor shaft (1), a rotor and a mounting sleeve (2) according to any one of claims 1 to 8, wherein the inner circumference of the mounting sleeve (2) is interference fit with the outer circumference of the rotor shaft (1), and the outer circumference of the mounting sleeve (2) is interference fit with the inner circumference of the rotor.

10. A pump, characterized in that The pump comprises a motor according to claim 9.

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