A sealing device for an electric machine and an electric machine

Abstract

The utility model belongs to motor technical field discloses a kind of sealing device and motor for motor.The device includes mutually matched stator support, protective cover, rotor shell, baffle and sealing brush;The protective cover is outwardly extended and arranged along the circumferential end of the stator support;The rotor shell gap is set on the stator support, and the baffle is outwardly extended and arranged along the circumferential end of the rotor shell close to the protective cover;Wherein, gap is equipped between the protective cover and the baffle;The sealing brush is fixed on the outside wall of the protective cover, including flexible brush wire;The flexible brush wire is located at the gap between the protective cover and baffle, and the end close to baffle is abutted with the baffle.The utility model can effectively avoid impurities into air gap, and then ensure normal operation of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a sealing device for a motor and a motor. Background Technology

[0002] Currently, the sealing problem of motors is often overlooked in existing motor designs, which leads to corresponding defects in motors during practical applications.

[0003] Specifically, in motor design, an air gap needs to be reserved between the stator and rotor to allow for free rotor rotation. However, corresponding sealing structures are not installed at both ends of the motor's axial direction. This results in external airflow carrying impurities being forced into the air gap during rotor rotation. As the motor is used over time, impurities accumulate in the air gap, affecting not only the normal rotation of the rotor and reducing motor output power, but also, in severe cases, causing the motor to jam and become inoperable. Therefore, sealing the motor to prevent external impurities from entering the stator-rotor gap is of significant practical importance for ensuring normal motor operation.

[0004] Based on this, this application considers setting a corresponding sealing structure on the motor to solve the above-mentioned technical defects that affect the normal operation of the motor due to the lack of a seal. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing device and a motor for an electric motor, so as to solve the technical problem that impurities enter the air gap with the airflow and thus affect the normal operation of the motor.

[0006] To achieve the above objectives, the present invention proposes the following technical solution: A sealing device for an electric motor is provided, comprising a stator support, a protective cover, a rotor housing, a baffle, and a sealing brush that cooperate with each other. The protective cover extends outward along the circumferential end of the stator support; the rotor housing is fitted onto the stator support with a gap; the baffle extends outward along the circumferential end of the rotor housing near the protective cover; wherein, a gap is provided between the protective cover and the baffle. The sealing brush is fixed to the outer wall of the protective cover and includes flexible brush bristles; the flexible brush bristles are located in the gap between the protective cover and the baffle, and one end near the baffle abuts against the baffle.

[0007] Furthermore, the sealing brush also includes an annular support body, and the flexible brush bristles are arranged and fixed on the outer peripheral wall of the annular support body; the annular support body is fixed on the outer side wall of the protective cover.

[0008] Furthermore, it includes an adhesive layer disposed on the annular support; the annular support is adhered and fixed to the outer wall of the protective cover by the adhesive layer.

[0009] Furthermore, it includes an annular pressure plate and several fasteners; the annular pressure plate is provided with several first fixing holes, the annular support body is provided with several second fixing holes at corresponding positions, and the protective cover is provided with several third fixing holes at corresponding positions; the annular pressure plate is pressed onto the annular support body, and each fastener passes through the first fixing hole, the second fixing hole and the third fixing hole in sequence to press and fix the annular support body onto the protective cover.

[0010] Furthermore, it includes a fixing groove, which is formed on the protective cover and the opening of the fixing groove faces the baffle; the sealing brush is snapped into the fixing groove.

[0011] Furthermore, the flexible bristles include at least one dense zone and at least one loose zone; the dense zone and the loose zone are staggered along the motor axis.

[0012] Furthermore, the flexible brush filaments include flexible alloy brush filaments, silicon carbide abrasive brush filaments, or nylon brush filaments.

[0013] Furthermore, the baffle is an L-shaped structure formed by the rotor housing extending outward along the circumferential end near the protective cover; the unused ends of the L-shaped structure are spaced above the protective cover.

[0014] Furthermore, the protective cover extends outward along the circumferential end of the stator support and is fixed to the stator support.

[0015] An electric motor is provided, including the aforementioned sealing device.

[0016] Beneficial effects: This technical solution provides a sealing device for an electric motor to effectively seal the air gap between the stator and rotor, thereby preventing dust and other solid particles from entering.

[0017] The device includes a stator support, a protective cover, a rotor housing, a baffle, and a sealing brush that cooperate with each other. Specifically, the protective cover extends outward along the circumferential end of the stator support; the rotor housing is fitted onto the stator support with a gap; and the baffle extends outward along the circumferential end of the rotor housing near the protective cover; wherein a gap is provided between the protective cover and the baffle. The sealing brush is fixed to the outer wall of the protective cover and includes flexible bristles; the flexible bristles are located in the gap between the protective cover and the baffle, and one end near the baffle abuts against the baffle.

[0018] Based on the above setup, during motor operation, the rotor's rotation causes random elastic deformation of the flexible brush filaments in contact with it, resulting in an uneven distribution among the filaments. Under atmospheric pressure, the external airflow tends to be compressed into the air gap between the rotor and stator. This disrupts the uniformity of the airflow entering the gaps between the flexible brush filaments, creating a fluid self-sealing effect that effectively filters solid particles carried in the airflow. This achieves an effective sealing of the air gap between the stator and rotor.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Fig. 1 This is a top view of the sealing device for an electric motor described in Example 1; Fig. 2 This is a cross-sectional view along FF of the sealing device for the motor described in Example 1.

[0022] The attached figures are labeled as follows: 1 is the stator support, 2 is the protective cover, 3 is the rotor housing, 4 is the baffle, 5 is the sealing brush, 6 is the annular pressure plate; 51 is the annular support, 52 is the flexible brush bristles, and 61 is the first fixing hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0024] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] An electric motor is an electromagnetic device used for the conversion or transmission of electrical energy, and it is widely used in daily life and industrial production. In the structural design of an electric motor, an air gap needs to be set between the stator and the rotor to allow for free rotation of the rotor. However, existing electric motors do not seal both ends of the motor axis. As a result, with the increase in the motor's service life, impurities accumulate in the air gap, which not only affects the normal rotation of the rotor and reduces the motor's output power, but in severe cases, it can even cause the motor to jam and become inoperable. Therefore, this embodiment aims to provide a sealing device for electric motors to solve the above-mentioned technical problems.

[0026] The sealing device for motors disclosed in this utility model will be described in detail below with reference to the embodiments shown in the accompanying drawings.

[0027] The motor corresponding to the sealing device includes a stator and a rotor. The rotor is spaced and sleeved on the stator. Correspondingly, combined with... Figs. 1-2As shown, the sealing device includes a stator support 1, a protective cover 2, a rotor housing 3, a baffle 4, and a sealing brush 5 that cooperate with each other. Specifically, the stator support 1 has a rotating shaft in the middle, and a stator core is fixed on its outer peripheral wall. A winding formed by conductors is wound on the stator core. The rotor housing 3 is fitted onto the stator support 1 with a gap, and several magnets are fixed on its inner side wall. The magnets are correspondingly arranged with the winding.

[0028] Specifically, the protective cover 2 extends outward along the circumferential end of the stator support 1, and the baffle 4 extends outward along the circumferential end of the rotor housing 3 near the protective cover 2, with a gap between the protective cover 2 and the baffle 4. In this embodiment, the protective cover 2 extends outward along the circumferential end of the stator support 1 to form an inverted U-shaped structure and is fixed to the stator support 1.

[0029] The sealing brush 5 includes an annular support 51 and flexible bristles 52. The flexible bristles 52 are arranged and fixed on the outer peripheral wall of the annular support 51. The annular support 51 is fixed on the outer side wall of the protective cover 2. As an optional embodiment, in this embodiment, the sealing brush 5 may only include flexible bristles 52, in which case the flexible bristles 52 can be directly fixed to the outer side wall of the protective cover 2. In specific implementation, this embodiment still adopts a sealing brush structure including an annular support 51 and flexible bristles 52.

[0030] Continuing, in this embodiment, since the protective cover has an inverted U-shaped structure, the annular support 51 is specifically fixed to the upper surface of the protective cover 2. The flexible brush bristles 52 can be non-metallic or metallic. When non-metallic, they can be silicon carbide abrasive bristles or nylon bristles. The nylon bristles have flame-retardant and anti-static properties. In specific implementations, a wear-resistant coating can be sprayed onto the nylon bristles to improve their service life. In this embodiment, flexible alloy bristles are specifically used. Further, the flexible alloy bristles are specifically cobalt-based alloy bristles.

[0031] In one specific implementation, an adhesive layer can be provided to fix the sealing brush 5. Specifically, the adhesive layer is provided on the annular support 51. The annular support 51 is then adhered and fixed to the outer wall of the protective cover 2 by the adhesive layer, thereby achieving the adhesion and fixation of the sealing brush 5. In this embodiment, the adhesive layer is specifically an adhesive layer, which can be formed by thermosetting adhesive or light-curing adhesive.

[0032] As another specific implementation, a fixing groove can be provided to fix the sealing brush 5. The fixing groove is formed on the protective cover 2, and the opening of the fixing groove faces the baffle 4. In this case, the annular support 51 can be snapped into the fixing groove to achieve the snap-fit ​​fixation of the sealing brush. As an alternative implementation, the fixing groove can also be formed by a U-shaped plate fixed to the protective cover. Specifically, the U-shaped plate can be made of aluminum alloy.

[0033] In another specific implementation, to fix the sealing brush 5, an annular pressure plate 6 and several fixing components can be provided. The annular pressure plate 6 has several first fixing holes 61, the annular support body 51 has several second fixing holes at corresponding positions, and the protective cover 2 has several third fixing holes at corresponding positions. Specifically, the first fixing holes 61 and the second fixing holes are through holes, and the third fixing holes are blind holes. In this case, the annular pressure plate 6 presses onto the annular support body 51, and each fixing component passes through the first fixing hole 61, the second fixing hole, and the third fixing hole in sequence to press and fix the annular support body 51 onto the protective cover 2. This embodiment illustrates... Fig. 1 and Fig. 2 The corresponding structure specifically adopts this method. Furthermore, for ease of fixing, several protrusions are provided on the annular pressure plate 6 and the annular support 51. Corresponding first fixing holes 61 and second fixing holes are formed on the respective protrusions. Specifically, the fixing element is a bolt.

[0034] The flexible bristles 52 are located in the gap between the protective cover 2 and the baffle 4, with their unused ends abutting against the baffle 4. To achieve this structural relationship, the effective length of the flexible bristles 52 is set to be greater than the width of the gap between the protective cover 2 and the baffle 4. The effective length of the flexible bristles 52 is defined as its length in its naturally elongated state.

[0035] In practice, the rotational motion of the rotor causes the flexible brush filaments 52 in contact with it to undergo random elastic deformation, resulting in a non-uniform distribution of gaps between the flexible brush filaments 52. Under atmospheric pressure, the external airflow tends to be squeezed into the air gap between the rotor and stator. At this time, the uniformity of the airflow entering the gaps between the flexible brush filaments 52 is disrupted, thereby generating a fluid self-sealing effect, which can effectively filter solid particles carried in the airflow.

[0036] In a preferred embodiment, to further prevent impurities from entering the air gap, the baffle 4 extends outward from the circumferential end of the rotor housing 3 near the protective cover 2, forming an L-shaped structure; the unused ends of the L-shaped structure are spaced above the protective cover. In this case, the L-shaped baffle also provides a certain degree of obstruction, thereby preventing impurities from entering the air gap.

[0037] As another preferred embodiment, to optimize the resulting fluid self-sealing effect, the flexible bristles 52 may be configured to include at least one dense zone and at least one loose zone. In this case, the dense and loose zones are staggered along the motor axis, which can further disrupt the uniformity of the airflow.

[0038] This embodiment also provides a motor equipped with the aforementioned sealing device. The motor described in this embodiment can be a flat wire motor or a round wire motor, a DC motor or an AC motor, an electric motor or a generator. Specifically, when it is a flat wire motor, it can be an air-cooled motor, and further, it can be a cantilevered air-cooled motor.

[0039] Since the motor is equipped with the aforementioned sealing device, the motor described in this embodiment has the following technical advantages as a whole: (1) Motor sealing performance: The motor stator and rotor have good sealing performance, effectively preventing solid foreign objects and dust from entering the air gap, and achieving a high level of protection. (2) Space compactness: The sealing device is small in size, suitable for the layout of compact motors with limited space; the overall structure is simpler, especially suitable for modern motors with high-density layouts. (3) Maintenance cost: The sealing device is easy to disassemble, and the maintenance and repair workload is small. (4) Reliability: The sealing device has a simple structure, is driven by the motor itself, and does not require a complex electronic control system; the working principle is simple, and the reliability is relatively high.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A sealing device for an electric motor, characterized in that, This includes a stator support, protective cover, rotor housing, baffle, and sealing brush that work together. The protective cover extends outward along the circumferential end of the stator support; the rotor housing is fitted onto the stator support with a gap; the baffle extends outward along the circumferential end of the rotor housing near the protective cover; wherein, a gap is provided between the protective cover and the baffle. The sealing brush is fixed to the outer wall of the protective cover and includes flexible brush bristles; the flexible brush bristles are located in the gap between the protective cover and the baffle, and one end near the baffle abuts against the baffle.

2. The sealing device for an electric motor according to claim 1, characterized in that, The sealing brush also includes an annular support body, and the flexible brush bristles are arranged and fixed on the outer peripheral wall of the annular support body; the annular support body is fixed on the outer side wall of the protective cover.

3. The sealing device for an electric motor according to claim 2, characterized in that, It includes an adhesive layer, which is disposed on the annular support; the annular support is adhered and fixed to the outer wall of the protective cover by the adhesive layer.

4. The sealing device for an electric motor according to claim 2, characterized in that, It includes an annular pressure plate and several fasteners; the annular pressure plate is provided with several first fixing holes, the annular support body is provided with several second fixing holes at corresponding positions, and the protective cover is provided with several third fixing holes at corresponding positions; the annular pressure plate is pressed onto the annular support body, and each fastener passes through the first fixing hole, the second fixing hole and the third fixing hole in sequence to press and fix the annular support body onto the protective cover.

5. The sealing device for an electric motor according to claim 1, characterized in that, It includes a fixing groove, which is formed on the protective cover and the opening of the fixing groove faces the baffle; the sealing brush is snapped into the fixing groove.

6. The sealing device for an electric motor according to claim 1, characterized in that, The flexible bristles include at least one dense zone and at least one loose zone; the dense zone and the loose zone are staggered along the motor axis.

7. The sealing device for an electric motor according to claim 1, characterized in that, The flexible brush filaments include flexible alloy brush filaments, silicon carbide abrasive brush filaments, or nylon brush filaments.

8. The sealing device for an electric motor according to claim 1, characterized in that, The baffle is an L-shaped structure formed by the rotor housing extending outward from the circumferential end near the protective cover; the empty ends of the L-shaped structure are spaced above the protective cover.

9. The sealing device for an electric motor according to claim 1, characterized in that, The protective cover extends outward along the circumferential end of the stator support and is fixed to the stator support.

10. An electric motor, characterized in that, Includes the sealing device according to any one of claims 1-9.

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