Direct-current plastic package motor convenient to disassemble and assemble

Abstract

The utility model discloses a direct-current plastic package motor convenient to disassemble and assemble. The direct-current plastic package motor comprises a cylindrical plastic shell stator, a rotor assembly and a metal end cover, a multi-stage annular step structure is arranged around the opening of the rotor accommodating groove; the multi-stage annular step structure comprises a first-stage annular protrusion and a second-stage annular protrusion from inside to outside, and the first-stage annular protrusion is higher than the second-stage annular protrusion. The metal end cover comprises a middle disc body and an outer annular wall, the middle disc body is provided with a first annular bulge, and a first annular recess is formed between the first annular bulge and the outer annular wall; the first annular bulge is embedded into the rotor accommodating groove; the first-stage annular protrusion and the first annular recess are embedded in a matched mode. A plurality of lateral notches are formed in the periphery of the first-stage annular protrusion, and an annular gap is formed between the lower end face of the outer annular wall and the upper surface of the second-stage annular protrusion. Through the arrangement of the gap and the annular gap, a convenient prying point is provided for disassembly, damage to the plastic shell stator is avoided, the metal end cover cannot be completely expanded due to the arrangement of the gap, and disassembly convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a DC plastic-encapsulated motor that is convenient for disassembly and assembly. Background Art

[0002] The DC plastic-encapsulated motor is a type of motor widely used in various mechanical equipment and is favored for its high efficiency, low noise, and good sealing performance. The structure of this motor generally includes a main housing, a metal end cover, and an internal rotor assembly. When designing a DC plastic-encapsulated motor, the connection method between the metal end cover and the main housing is crucial for the overall performance and maintenance of the motor.

[0003] Patent CN117013721A discloses a plastic-encapsulated motor for a tower fan, which includes a housing (1), a rear metal end cover (2), a stator assembly (3), a wire clip (4), a rotor assembly (5), a front metal end cover (6), and a pin (7). The housing (1) injects and molds the rear metal end cover (2), the stator assembly (3), and the wire clip (4) into one body through BMC material. The stator assembly (3) is located inside the housing (1). The front metal end cover (6) is installed on the front side of the housing (1). The rotor assembly (5) is rotatably connected inside the housing (1).

[0004] The DC plastic-encapsulated motor disclosed in Patent CN203206066U includes a stator and a rotor. Front metal end covers and rear metal end covers are respectively arranged on both sides of the stator. A plastic-encapsulated housing is formed by injection molding outside the stator. A first engaging hole is provided on the front metal end cover, and a second engaging hole is provided on the rear metal end cover. Both ends of a metal conductive part are respectively engaged in the first engaging hole and the second engaging hole.

[0005] In the prior art, the metal end cover of the DC plastic-encapsulated motor is usually connected to the main housing by a method of large interference fit. This connection method can provide good sealing performance and structural stability, but it also brings certain disassembly difficulties. Due to the interference fit between the metal end cover and the main housing, the disassembly process becomes relatively complex when the motor needs maintenance or component replacement. Traditional disassembly methods require the use of special gap prying tools to apply external force to pry the metal end cover to break the original interference fit state. However, this method has certain risks. Because during the prying process, if the operation is improper, it is easy to cause damage to the main housing, such as cracks and deformations, which will not only affect the appearance of the motor but also may reduce its performance and service life. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a DC plastic-encapsulated motor that is convenient for disassembly and assembly. By providing a multi-level structure and notch settings on the main housing, an operating space for disassembling the metal end cover is provided, and the convenience of disassembling the metal end cover is improved.

[0007] The technical solution adopted by the present utility model to solve the above technical problems is as follows: a DC plastic-encapsulated motor that is convenient for disassembly and assembly, including a cylindrical plastic shell stator, a rotor assembly, and a metal end cover;

[0008] The plastic shell stator includes a rotor receiving groove with an open side, the rotor assembly is located in the rotor receiving groove, and the metal end cover seals the rotor receiving groove;

[0009] A multi-stage annular step structure is provided around the opening of the rotor receiving groove; the multi-stage annular step structure includes a first annular protrusion and a second annular protrusion from the inside to the outside, and the first annular protrusion is higher than the second annular protrusion;

[0010] The metal end cover includes a middle disc body and an outer annular wall, the middle disc body is provided with a first annular protrusion, and a first annular depression is formed between the first annular protrusion and the outer annular wall;

[0011] The first annular protrusion is embedded in the rotor receiving groove; the first annular protrusion and the first annular depression are fitted and installed in a matching manner;

[0012] A plurality of lateral notches are provided on the outer periphery of the first annular protrusion, and an annular gap is formed between the lower end surface of the outer annular wall and the upper surface of the second annular protrusion.

[0013] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: a plurality of first screw holes are provided at intervals on the upper end surface of the first annular protrusion, and corresponding second screw holes are provided at the first annular depression of the metal end cover;

[0014] Screws pass through the second screw holes and the first screw holes to fixedly connect the metal end cover and the plastic shell stator.

[0015] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: a metal insert is provided in the plastic body of the first annular protrusion, the first screw holes are provided on the metal insert, and the metal insert and the plastic body are integrally formed by insert injection molding.

[0016] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: the first annular protrusion and the rotor receiving groove are in interference fit, and the interference amount is less than or equal to 0.02 mm; the first annular protrusion and the first annular depression are in interference fit, and the interference amount is less than or equal to 0.02 mm.

[0017] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: the lower edge of the outer annular wall is provided with a horizontally outward extending annular flange, and the annular gap is located between the annular flange and the upper surface of the second annular protrusion.

[0018] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: the outer diameter of the annular folded edge is greater than or equal to the outer diameter of the secondary annular protrusion; the shoulder of the secondary annular protrusion is rounded to form an arc-shaped transition ring surface.

[0019] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: the intermediate disk body is provided with a second annular protrusion, the upper surface of the rotor assembly is provided with a second annular recess, and the second annular protrusion and the second annular recess are fitted and have a loose fit.

[0020] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: the notch and the second screw hole are staggeredly distributed.

[0021] The preferred technical solution adopted by the present utility model to solve the above technical problems is a DC plastic-encapsulated motor that is easy to disassemble and assemble, including a cylindrical plastic shell stator, a rotor assembly, and a metal end cover;

[0022] The plastic shell stator includes a rotor receiving groove with one side open, the rotor assembly is located in the rotor receiving groove, and the metal end cover seals the rotor receiving groove;

[0023] A multi-stage annular step structure is provided around the opening of the rotor receiving groove; the multi-stage annular step structure includes a primary annular protrusion and a secondary annular protrusion from the inside to the outside, and the primary annular protrusion is higher than the secondary annular protrusion;

[0024] The metal end cover includes an intermediate disk body and an outer annular wall, the intermediate disk body is provided with a first annular protrusion, and a first annular recess is formed between the first annular protrusion and the outer annular wall;

[0025] The first annular protrusion is embedded in the rotor receiving groove; the primary annular protrusion and the first annular recess are fitted and matched;

[0026] A plurality of lateral notches are provided on the outer periphery of the primary annular protrusion, the lower edge of the outer annular wall is provided with an annular folded edge extending horizontally outwards, and between the lower surface of the annular folded edge and the upper surface of the secondary annular protrusion.

[0027] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: a plurality of metal inserts are integrally formed by insert molding in the plastic body of the primary annular protrusion, and the metal inserts are evenly distributed annularly along the primary annular protrusion; the metal inserts are located exactly in the middle between two adjacent notches;

[0028] The metal insert is provided with a first threaded hole longitudinally penetrating to the upper end surface of the first-stage annular protrusion, and a corresponding second threaded hole is provided at the first annular recess of the metal end cover; a screw passes through the second threaded hole and the first threaded hole to fixedly connect the metal end cover and the plastic shell stator.

[0029] Compared with the prior art, the advantages of the present utility model are as follows: This design provides a structured disassembly and assembly interface. Through the multi-stage annular step structure, the multi-stage concave-convex fit between the metal end cover and the plastic shell stator not only strengthens the connection strength but also improves the sealing performance. In addition, the design of the middle disc body and the outer annular wall increases the structural strength of the metal end cover and improves the impact resistance of the motor.

[0030] Most importantly, the setting of the notch and the annular gap provides a clear operating space for disassembly. An ordinary prying tool can easily enter the notch from the annular gap, thereby providing a convenient prying point, enabling the tool to act upward on the more firmly fixed metal end cover, avoiding damage to the plastic shell stator, and making the operation more labor-saving and convenient. In addition, the setting of the notch prevents the first-stage annular protrusion and the outer annular wall from being completely stuck, improving the disassembly convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present utility model will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 It is a schematic diagram of a DC plastic-encapsulated motor that is convenient for disassembly and assembly;

[0033] Figure 2 It is a Figure 1 partial enlarged view of a DC plastic-encapsulated motor that is convenient for disassembly and assembly;

[0034] Figure 3 It is an exploded view of a DC plastic-encapsulated motor that is convenient for disassembly and assembly;

[0035] Figure 4 It is a schematic diagram of the plastic shell stator and rotor assembly of a DC plastic-encapsulated motor that is convenient for disassembly and assembly;

[0036] Figure 5 It is a schematic diagram of the metal end cover of a DC plastic-encapsulated motor that is convenient for disassembly and assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary, and should not be construed as limiting the scope of protection of the present utility model.

[0038] It should be noted that like reference numerals denote like elements in the following drawings. Therefore, once an element is defined in one drawing, it will not be further defined and explained in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. The terms "first" and "second" are only for descriptive convenience and have no other directional meaning, and should not be construed as a limitation of the present utility model.

[0040] As Figures 3 - 5 shown, this embodiment provides a DC plastic-encased motor that is convenient for disassembly and assembly, including a cylindrical plastic housing stator 1, a rotor assembly 2, and a metal end cap 3. The plastic housing stator 1 includes a rotor receiving groove S that is open on one side. The rotor assembly 2 is located within the rotor receiving groove S, and the metal end cap 3 seals the rotor receiving groove S.

[0041] As Figures 1 - 3 shown, a multi-stage annular stepped structure 10 is provided around the opening of the rotor receiving groove S. The multi-stage annular stepped structure 10 includes a first-stage annular protrusion 11 and a second-stage annular protrusion 12 from the inside out, and the first-stage annular protrusion 11 is higher than the second-stage annular protrusion 12.

[0042] As Figure 3 、 5 shown, the metal end cap 3 includes an intermediate disk body 30 and an outer annular wall 31. The intermediate disk body 30 is provided with a first annular protrusion 32, and a first annular depression 33 is formed between the first annular protrusion 32 and the outer annular wall 31.

[0043] As Figures 1 - 5 shown, the first annular protrusion 32 is embedded within the rotor receiving groove S. The first-stage annular protrusion 11 and the first annular depression 33 are fitted and installed in a matching manner. A plurality of lateral notches M are provided on the outer periphery of the first-stage annular protrusion 11, and there is an annular gap K between the lower end surface of the outer annular wall 31 and the upper surface of the second-stage annular protrusion 12.

[0044] This design provides a structured disassembly and assembly interface. Through the multi-stage annular step structure 10, the multi-stage concave-convex fit between the metal end cover 3 and the plastic shell stator 1 not only strengthens the connection strength, but also improves the sealing performance. In addition, the design of the intermediate disk 30 and the outer annular wall 31 increases the structural strength of the metal end cover 3 and improves the impact resistance of the motor.

[0045] Most importantly, the setting of the notch M and the annular gap K provides a clear operating space for disassembly. Ordinary prying tools can easily enter the notch M from the annular gap K, thereby providing a convenient prying point, so that the tool can act upward on the metal end cover 3 with stronger strength, avoiding damage to the molded case stator 1, and the operation is more labor-saving and convenient. In addition, the setting of the notch M prevents the primary annular protrusion 11 from being completely blocked from the outer annular wall 31, thereby improving the convenience of disassembly.

[0046] Preferably, the upper end surface of the molded case stator outside the multi-stage annular step structure 10 is inclined downward from the inside to the outside, thereby further reducing the possibility of damage to the molded case stator by tools during the disassembly and assembly process.

[0047] like Figure 3 As shown, the upper end surface of the primary annular protrusion 11 is provided with a plurality of first screw holes P distributed at intervals, and the first annular recess 33 of the metal end cover 3 is provided with corresponding second screw holes Q. The screws pass through the second screw holes Q and the first screw holes P to fix the metal end cover 3 and the plastic shell stator 1. The fixing method of the screws provides a fast and reliable connection method, which is convenient for the assembly and disassembly of the motor, and the interval distribution of the screw holes increases the uniformity and stability of the connection force.

[0048] like Figure 3 As shown, a metal insert is provided in the plastic body of the primary annular protrusion 11, and the metal insert is provided with a longitudinal first screw hole P. The metal insert and the plastic body are integrally formed by insert injection molding, and the first screw hole P penetrates to the upper end surface of the primary annular protrusion 11. The addition of the metal insert improves the durability and strength of the structure, especially when subjected to a large disassembly force, the metal insert can effectively prevent damage to the plastic body. The metal insert and the plastic body are integrally formed by insert injection molding, so that the two are closely combined, avoiding the separation of the metal insert and improving the connection strength.

[0049] like Figure 3 As shown, the notch M and the second screw hole Q are staggered. The metal inserts are evenly distributed in a ring shape along the primary annular protrusion 11. The metal inserts are located in the middle of two adjacent notches M. This arrangement maximizes the injection molding strength.

[0050] like Figure 3 , 5As shown, the interference fit between the first annular protrusion 32 and the rotor receiving groove S, and between the first-stage annular protrusion 11 and the first annular recess 33 is controlled within 0.02 mm. This interference amount not only ensures the sealing performance and connection stability between the motor components, but also controls the interference amount to reduce the disassembly force, reduce the damage to the components during disassembly, and improve the reliability and durability of the motor.

[0051] As Figure 2 , 3 , as shown in FIG. 5, the lower edge of the outer annular wall 31 is provided with an annular flange 34 extending horizontally outwards, and an annular gap K is located between the annular flange 34 and the upper surface of the second-stage annular protrusion 12. The design of the annular flange 34 provides an additional support point for disassembly, further improving the convenience of disassembly.

[0052] As Figure 2 shown, the outer diameter of the annular flange 34 is greater than or equal to the outer diameter of the second-stage annular protrusion 12, which makes the prying tool necessarily contact the metal end cover 3 first during operation. The shoulder fillet of the second-stage annular protrusion 12 forms an arc-shaped transition surface 15, and the downward structure of the transition surface 15 also expands the operating space of the prying tool, making the operation safer and more reliable.

[0053] As Figures 3 - 5 shown, the middle disk body 30 is provided with a second annular protrusion 35, and the upper surface of the rotor assembly 2 is provided with a second annular recess 20. The second annular protrusion 35 and the second annular recess 20 are fitted and have a loose fit. In this way, the strength of the metal end cover 3 is further increased, as well as the integrity of the connection among the plastic shell stator 1, the rotor assembly 2, and the metal end cover 3 in the DC plastic-sealed motor, improving the connection stability. And the cooperation between the second annular protrusion 35 and the second annular recess 20 forms a movable guide rail, which also improves the stability and smoothness of the movement of the motor structure.

[0054] The DC plastic-sealed motor that is convenient for disassembly provided by the present utility model has been introduced. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the present utility model and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A DC plastic-encapsulated motor that is easy to disassemble and assemble, characterized in that: It includes a cylindrical plastic shell stator, a rotor assembly and a metal end cover; The molded case stator comprises a rotor receiving groove with one side open, the rotor assembly is located in the rotor receiving groove, and the metal end cover seals the rotor receiving groove; A multi-stage annular step structure is provided around the opening of the rotor receiving groove; the multi-stage annular step structure includes a primary annular protrusion and a secondary annular protrusion from the inside to the outside, and the primary annular protrusion is higher than the secondary annular protrusion; The metal end cover comprises an intermediate disk body and an outer annular wall, the intermediate disk body is provided with a first annular protrusion, and a first annular recess is formed between the first annular protrusion and the outer annular wall; The first annular protrusion is embedded in the rotor receiving groove; the primary annular protrusion is matched and embedded with the first annular recess; The outer periphery of the primary annular protrusion is provided with a plurality of lateral notches, and the lower end surface of the outer annular wall and the upper surface of the secondary annular protrusion have an annular gap.

2. The DC plastic-encapsulated motor that is easy to disassemble and assemble according to claim 1, characterized in that The upper end surface of the primary annular protrusion is provided with a plurality of first screw holes distributed at intervals, and the first annular recess of the metal end cover is provided with corresponding second screw holes; The screw passes through the second screw hole and the first screw hole to fix the metal end cover and the plastic shell stator.

3. The DC plastic-encapsulated motor that is easy to disassemble and assemble according to claim 2, characterized in that A metal insert is arranged in the plastic body of the primary annular protrusion, the first screw hole is arranged on the metal insert, and the metal insert and the plastic body are integrally formed by insert injection molding.

4. The DC plastic-encapsulated motor that is easy to disassemble and assemble according to claim 1, characterized in that The first annular protrusion is interference fit with the rotor accommodating groove, and the interference is less than or equal to 0.02 mm; the primary annular protrusion is interference fit with the first annular recess, and the interference is less than or equal to 0.02 mm.

5. The DC plastic-encapsulated motor that is easy to disassemble and assemble according to claim 1, characterized in that The lower edge of the outer annular wall is provided with an annular fold extending horizontally outward, and the annular gap is located between the annular fold and the upper surface of the secondary annular protrusion.

6. The plastic-encapsulated DC motor that is easy to disassemble and assemble according to claim 5, characterized in that The outer diameter of the annular fold is greater than or equal to the outer diameter of the secondary annular protrusion; the shoulder of the secondary annular protrusion is rounded to form an arc-shaped transition annular surface.

7. The plastic-encapsulated DC motor that is easy to disassemble and assemble according to claim 5, characterized in that The intermediate disk body is provided with a second annular protrusion, and the upper surface of the rotor assembly is provided with a second annular recess, and the second annular protrusion is embedded in the second annular recess and is loosely matched.

8. The DC plastic-encapsulated motor that is easy to disassemble and assemble according to claim 2, characterized in that The notch and the second screw hole are staggered in distribution.

9. The DC plastic-encapsulated motor is easy to disassemble and assemble, and is characterized by: It includes a cylindrical plastic shell stator, a rotor assembly and a metal end cover; The molded case stator comprises a rotor receiving groove with one side open, the rotor assembly is located in the rotor receiving groove, and the metal end cover seals the rotor receiving groove; A multi-stage annular step structure is provided around the opening of the rotor receiving groove; the multi-stage annular step structure includes a primary annular protrusion and a secondary annular protrusion from the inside to the outside, and the primary annular protrusion is higher than the secondary annular protrusion; The metal end cover comprises an intermediate disk body and an outer annular wall, the intermediate disk body is provided with a first annular protrusion, and a first annular recess is formed between the first annular protrusion and the outer annular wall; The first annular protrusion is embedded in the rotor receiving groove; the primary annular protrusion is matched and embedded with the first annular recess; The outer periphery of the primary annular protrusion is provided with a plurality of lateral notches, and the lower edge of the outer annular wall is provided with an annular fold extending horizontally outward, between the lower surface of the annular fold and the upper surface of the secondary annular protrusion.

10. The plastic-encapsulated DC motor that is easy to disassemble and assemble according to claim 9, characterized in that A plurality of metal inserts are integrally formed in the plastic body of the primary annular protrusion by insert injection molding, and the metal inserts are evenly distributed in an annular shape along the primary annular protrusion; the metal insert is located in the middle of two adjacent notches; The metal insert is provided with a first threaded hole which penetrates longitudinally to the upper end surface of the primary annular protrusion, and the first annular recess of the metal end cover is provided with a corresponding second threaded hole; a screw passes through the second threaded hole and the first threaded hole to fix the metal end cover and the plastic shell stator.

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