A plastic-encapsulated motor and its assembly method

Abstract

This invention provides a plastic-encapsulated motor and its assembly method, including a plastic-encapsulated stator and an end cap. The end cap is sealed to the stator. The plastic-encapsulated stator includes a groove, and the end cap is provided with a retaining block that is sealed and engaged in the groove. The retaining block is provided with a through hole connecting the interior and exterior of the plastic-encapsulated motor, and a sealing element is sealed within the through hole. The windings of the plastic-encapsulated stator are provided with a wiring portion. The power cord of the plastic-encapsulated motor passes through the through hole sealed by the sealing element and is electrically connected to the wiring portion, which can improve the safety of the power cord and the sealing performance of the plastic-encapsulated motor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a plastic-encapsulated motor and its assembly method. Background Technology

[0002] A plastic-encapsulated motor is a type of motor that achieves dustproof, waterproof, moisture-proof, and insulating functions through encapsulation with plastic material. This type of motor has advantages such as high reliability, small size, and moderate cost. However, because plastic-encapsulated motors are injection molded in one piece, the motor's power cord and cable (windings) cannot withstand the high temperatures during the injection molding process. Therefore, additional wiring space needs to be reserved, resulting in the motor not being completely sealed.

[0003] Improving the safety of power cords while simultaneously enhancing the sealing performance of encapsulated motors is a pressing technical challenge that needs to be addressed. Summary of the Invention

[0004] Therefore, the present invention provides a plastic-encapsulated motor and its assembly method, which can improve the safety of the power cord while improving the sealing performance of the plastic-encapsulated motor.

[0005] On one hand, the present invention provides a plastic-encapsulated motor, including a plastic-encapsulated stator and an end cap, wherein the end cap is sealed to the stator, the plastic-encapsulated stator includes a groove, and the end cap is provided with a retaining block, the retaining block being sealed and snapped into the groove; the retaining block is provided with a through hole communicating between the interior and exterior of the plastic-encapsulated motor, and a sealing element is sealed in the through hole; the winding of the plastic-encapsulated stator is provided with a wiring portion, and the power line of the plastic-encapsulated motor passes through the through hole sealed by the sealing element and is electrically connected to the wiring portion.

[0006] In some embodiments, the through hole is a threaded hole, and the seal is threadedly connected within the through hole.

[0007] In some embodiments, the seal is assembled from multiple components.

[0008] In some embodiments, the locking block is interference-fitted into the groove, and the locking block is resilient.

[0009] In some embodiments, the seal is integrally resilient.

[0010] In some embodiments, the groove includes two opposing sides distributed along the circumferential direction of the stator, with the two sides serving to accommodate the locking block. The stator includes a first end face and a second end face facing away from each other. The groove is disposed on the first end face, and the distance between the two sides gradually increases from the first end face to the second end face. The locking block includes two opposing sides, with the two sides of the locking block respectively abutting against the two sides of the groove. The two sides of the locking block are parallel to each other, and the distance between the two sides of the locking block is less than the minimum distance between the two sides of the groove.

[0011] In some embodiments, the bottom surface of the groove is in contact with the top surface of the card block.

[0012] In some embodiments, the end of the plastic-encapsulated stator with the end cap is provided with a snap-fit ​​groove, which is used to snap a power cord.

[0013] On the other hand, the present invention also provides an assembly method for the aforementioned encapsulated motor, characterized in that the assembly method includes:

[0014] First, connect one end of the power cord to the connector.

[0015] Second, pass the power cord through the through hole via the seal;

[0016] Third, the sealing element is sealed and fixed inside the through hole;

[0017] Fourth, the end cap is sealed and connected to the plastic-encapsulated stator.

[0018] In some embodiments, one end of the plastic-encapsulated stator is provided with a snap-fit ​​groove;

[0019] One end of the power cord is electrically connected to the plastic-encapsulated stator, including fixing the power cord in the snap-fit ​​groove first, and then soldering the power cord to the wiring part.

[0020] The power cord of the encapsulated motor provided in this application is not encapsulated in plastic by the encapsulated motor, but passes through a through hole on the end cover, connecting the encapsulated stator of the motor to the external power supply. The power cord is sealed in the through hole by a sealing element, which improves the sealing performance and safety performance of the encapsulated motor. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the encapsulated stator and end cap of this invention before they are assembled together;

[0023] Figure 2 This is a schematic diagram of the encapsulated stator and end cap assembled together according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a plastic-encapsulated stator with a snap-fit ​​groove according to an embodiment of the present invention;

[0025] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 This is a schematic diagram of the end cap structure according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of an embodiment of the present invention where the sealing element is disposed in the groove and the power cord is inserted into the snap-fit ​​groove;

[0028] Figure 7 This is a partial schematic diagram of the encapsulated stator when the power cord is snapped into the slot according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the sealing element according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the connector housing according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the force exerted on the card block when the two opposite sides of the groove in an embodiment of the present invention form a V-shape.

[0032] The attached figures are labeled as follows:

[0033] 1. Plastic-encapsulated stator; 101. Groove; 2. End cap; 201. Locking block; 202. Through hole; 3. Seal; 301. Connector housing; 4. Snap-fit ​​groove. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] A plastic-encapsulated motor is a type of motor that achieves dustproof, waterproof, moisture-proof, and insulating functions through encapsulation with plastic material. This type of motor offers advantages such as high reliability, small size, and moderate cost. However, because plastic-encapsulated motors are injection molded in one piece, the motor's power cord and cable cannot withstand the high temperatures generated during the injection molding process. Therefore, additional wiring space needs to be reserved, resulting in the motor not being completely sealed.

[0039] In environments containing flammable gases, dust, vapors, or other flammable and explosive substances, these substances, when reaching a certain concentration in the air, can explode upon contact with an electrical spark or high-temperature objects, causing serious casualties and property damage. Therefore, if encapsulated motors are to be used, their sealing performance and spark resistance must be further improved. This invention develops a high-reliability encapsulated motor, aiming to improve the sealing safety of the motor's cable outlet structure. It introduces a completely new structure to achieve highly reliable installation of the motor's power cable, enhancing the safety of the encapsulated motor and broadening its application range.

[0040] This invention provides a plastic-encapsulated motor to improve the safety performance of the motor, such as... Figures 1-10 As shown, the encapsulated motor includes an encapsulated stator 1 and an end cap 2. The end cap 2 is sealed to the stator. The encapsulated stator 1 includes a groove 101. The end cap 2 is provided with a retaining block 201, which is sealed and inserted into the groove 101. The retaining block 201 is provided with a through hole 202 connecting the inside and outside of the encapsulated motor. A sealing element 3 is sealed inside the through hole 202. The winding of the encapsulated stator 1 is provided with a wiring portion. The power line of the encapsulated motor passes through the through hole 202 sealed by the sealing element 3 and is electrically connected to the wiring portion.

[0041] The power cord passes through the through-hole 202 on the end cover 2 and connects electrically to the wiring section of the encapsulated stator 1. Simultaneously, the end cover 2 is sealed and engaged into the groove 101 of the encapsulated stator 1 by the locking block 201, ensuring a sealed isolation between the internal environment of the encapsulated motor and the external environment. The power cord passes through the through-hole 202 of the end cover 2 through the sealing element 3, thus preventing damage to the power cord during stator encapsulation and ensuring the airtightness of the encapsulated motor. Improved airtightness of the encapsulated motor also correspondingly improves its spark resistance, enhances motor safety, broadens its application scenarios (range of use), enhances product versatility, and increases the competitiveness of the motor product.

[0042] Furthermore, one end of the plastic-encapsulated stator 1 is provided with a first snap-fit ​​structure, and the end cover 2 is provided with a second snap-fit ​​structure. The end cover 2 and the plastic-encapsulated stator 1 are also snapped together by the first snap-fit ​​structure and the second snap-fit ​​structure.

[0043] Furthermore, the wiring section includes three connector pins, and the power cord can be electrically connected to the connector pins by soldering to conduct current.

[0044] Preferred, such as Figure 5 As shown, the through hole 202 is a threaded hole, and the seal is threadedly connected inside the through hole 202.

[0045] By setting the through hole 202 as a threaded hole, the seal 3 is threadedly connected inside the through hole 202, which improves the convenience and applicability of the seal 3 connection.

[0046] Since the seal 3 is relatively easy to disassemble inside the threaded hole, the adjustability of the encapsulated motor assembly is improved.

[0047] Preferred, such as Figure 8 and Figure 9 As shown, the sealing element 3 is assembled from multiple components.

[0048] The seal 3 is composed of multiple parts, which facilitates the passage of the power cord through the seal 3 and can accommodate cables of different diameters, thereby improving the sealing performance of the power cord within the through hole 202.

[0049] The seal 3 has threaded fixing structures at both ends and plastic and rubber seals 3 in the middle to enhance the sealing of the device. The middle housing is threaded to cooperate with the thread in the through hole 202 of the end cover 2 to fix the seal 3. After the threads at both ends are fixed, the position of the power cord in the motor can be stabilized, improving the sealing and safety of the motor.

[0050] Specifically, the seal 3 is composed of components such as the connector housing 301, nuts, and sealing rings. The connector housing 301 has threads on its outer side, which fixes the seal 3 in the through hole 202 of the end cover 2 and allows the position of the seal 3 to be freely adjusted. The connector housing 301 has threaded interfaces on both sides, which are used in combination with the connector nut and the sealing ring, respectively. After the power cord passes through the seal 3, the nuts on both sides, together with the sealing ring, fix the power cord inside the seal 3, thereby improving the sealing performance of the encapsulated motor.

[0051] Preferably, the locking block 201 is interference-fitted into the groove 101, and the locking block 201 is resilient.

[0052] The locking block 201 is interference-fitted into the groove 101. The locking block 201 is tough, which means that the locking block 201 will inevitably undergo compressive deformation when it is locked into the groove 101. Firstly, this improves the firmness of the locking block 201 in the groove 101. Secondly, the compressive deformation of the locking block 201 also improves the sealing performance between the sealing element 3 and the through hole 202. Thirdly, it improves the sealing performance between the sealing element 3 and the power cord.

[0053] Preferably, the seal 3 has overall toughness.

[0054] The seal 3 is tough, so that when the block 201 is compressed and deformed, the seal 3 can also deform. The deformation of the seal 3 compresses the power line, which improves the sealing between the seal 3 and the through hole 202, and between the seal 3 and the power line.

[0055] Toughness refers to the property of a material to undergo plastic deformation, meaning it can recover its original shape after deformation within a certain range. Examples include rubber and molding compounds.

[0056] Preferred, such as Figure 2 and Figure 10 As shown, the groove 101 includes two opposing sides distributed along the circumferential direction of the stator, with the two sides serving to accommodate the locking block 201. The stator includes a first end face and a second end face facing away from each other. The groove 101 is disposed on the first end face, and the distance between the two sides gradually increases from the first end face to the second end face. The locking block 201 includes two opposing sides, with the two sides of the locking block 201 respectively abutting against the two sides of the groove 101. The two sides of the locking block 201 are parallel to each other, and the distance between the two sides of the locking block 201 is less than the minimum distance between the two sides of the groove 101.

[0057] By making the distance between the two sides of the groove 101 gradually increase from the first end face to the second end face, that is, by forming a V-shape with the two sides of the groove 101 opening towards the second end face, the groove 101 is generally trapezoidal; and the locking block 201 is resilient, so the deformation of the locking block 201 is different when it is squeezed by the two sides of the groove 101. Specifically, the squeezing force on the root of the locking block 201 is greater than the squeezing force on the top of the locking block 201. This improves the firmness of the locking block 201 within the groove 101; thus, the deformation trend of the through hole 202 is not that the opposite sides of the through hole 202 move closer to each other along the radial direction of the through hole 202, but rather that the side closer to the root of the locking block 201 is subjected to a squeezing force that moves closer to each other, such as... Figure 10 As shown, this reduces the amount of lengthening in other directions caused by pressure on the through hole 202 in one direction, thereby improving the sealing performance between the through hole 202 and the seal 3.

[0058] Furthermore, the distance between the two sides of the locking block 201 is greater than the maximum distance between the two opposite sides of the groove 101, thus avoiding gaps between the locking block 201 and the groove 101 and improving the sealing performance.

[0059] Preferred, such as Figure 2 As shown, the bottom surface of the groove 101 is in contact with the top surface of the card block 201.

[0060] The bottom surface of the groove 101 fits snugly against the top surface of the locking block 201, improving the sealing performance between the groove 101 and the locking block 201. When the root of the locking block 201 is compressed, due to the toughness of the locking block 201, the deformation of the locking block 201 under pressure can increase the compressive force between the top surface of the locking block 201 and the bottom surface of the groove 101, thereby improving the sealing performance between the locking block 201 and the groove 101.

[0061] Furthermore, such as Figure 1 , Figure 2 and Figure 5 As shown, the bottom surface of the groove 101 and the top surface of the locking block 201 are flat. From the radial direction of the plastic-encapsulated stator 1, the groove 101 and the locking block 201 are rectangular.

[0062] Preferred, such as Figure 6 and Figure 7 As shown, the plastic-encapsulated stator 1 has a snap-fit ​​groove 4 at one end where the end cover 2 is located, and the snap-fit ​​groove 4 is used to snap the power cord in place.

[0063] By setting the snap-fit ​​slot 4, when the power cord is electrically connected to the plastic-encapsulated stator 1, the power cord can be fixed in the snap-fit ​​slot 4, which improves the stability of the electrical connection between the power cord and the wiring part of the plastic-encapsulated stator 1 and avoids the power cord from contacting the rotor.

[0064] The locking slot 4 is located at the step of the wiring pin to fix the power cord and prevent the power cord from moving inside and interfering with the rotor operation after the motor is assembled.

[0065] After the power cord and the connector pin are soldered together, they are fixed in the stator end face locking groove 4 along the inner edge of the stator assembly.

[0066] On the other hand, this application also provides an assembly method for the aforementioned encapsulated motor, the assembly method comprising:

[0067] First, connect one end of the power cord to the connector.

[0068] Second, pass the power cord through the through hole 202 via the sealing element 3;

[0069] Third, seal the sealing element 3 within the through hole 202;

[0070] Fourth, the end cap 2 is sealed and connected to the plastic-encapsulated stator 1.

[0071] In this application:

[0072] First, connect one end of the power cord to the connector.

[0073] Second, the power cord is passed through the through hole 202 via the seal 3. At this time, the power cord passes through both the seal 3 and the through hole 202, but it is not sealed or fixed; it merely passes through. This is because, after the power cord is electrically connected to the encapsulated stator 1, it will be difficult for the power cord to pass through the through hole 202 and the seal 3. Specifically, the sealing housing is screwed into the through hole 202 of the end cover 2, the motor rotor is positioned, and the end cover 2 latch 201 is aligned with the stator assembly groove 101, and then slowly moved closer.

[0074] Third, the sealing element 3 is sealed and fixed inside the through hole 202; when the sealing element 3 is sealed and fixed inside the through hole 202, the power cord is also sealed and fixed inside the sealing element 3 at the same time.

[0075] Fourth, the end cap 2 is sealed and connected to the plastic-sealed stator 1; specifically, the locking block 201 is inserted into the groove 101.

[0076] Preferably, one end of the plastic-encapsulated stator 1 is provided with a snap-fit ​​groove 4;

[0077] One end of the power cord is electrically connected to the plastic-encapsulated stator 1, including fixing the power cord in the snap-fit ​​groove 4 first, and then soldering the power cord to the wiring part.

[0078] The power cord is first fixed in the slot 4 to ensure its stability and prevent it from moving and becoming loose when soldering to the connector later.

[0079] Before assembling the motor, the end cap 2 with through hole 202 is first made using a mold; then the new stator assembly is made using a mold.

[0080] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A plastic-encapsulated motor, comprising a plastic-encapsulated stator (1) and an end cap (2), wherein the end cap (2) is sealed to the stator, characterized in that, The encapsulated stator (1) includes a groove (101), and the end cap (2) is provided with a locking block (201), which is sealed and locked into the groove (101); the locking block (201) is provided with a through hole (202) connecting the inside and outside of the encapsulated motor, and a sealing element (3) is sealed in the through hole (202); the winding of the encapsulated stator (1) is provided with a wiring part, and the power line of the encapsulated motor passes through the through hole (202) sealed by the sealing element (3) and is electrically connected to the wiring part.

2. The encapsulated motor according to claim 1, characterized in that, The through hole (202) is a threaded hole, and the seal (3) is threadedly connected inside the through hole (202).

3. The encapsulated motor according to claim 1, characterized in that, The seal (3) is assembled from multiple components.

4. The encapsulated motor according to claim 1, characterized in that, The locking block (201) is press-fitted into the groove (101), and the locking block (201) is resilient.

5. The encapsulated motor according to claim 4, characterized in that, The seal (3) is tough as a whole.

6. The encapsulated motor according to claim 4, characterized in that, The groove (101) includes two opposing sides, which are distributed along the circumferential direction of the stator. The two sides are used to accommodate the locking block (201). The stator includes a first end face and a second end face facing away from each other. The groove (101) is disposed on the first end face. The distance between the two sides gradually increases from the first end face to the second end face. The locking block (201) includes two opposing sides, which are respectively adjacent to the two sides of the groove (101). The two sides of the locking block (201) are parallel to each other. The distance between the two sides of the locking block (201) is less than the minimum distance between the two sides of the groove (101).

7. The encapsulated motor according to claim 6, characterized in that, The bottom surface of the groove (101) is in contact with the top surface of the card block (201).

8. The encapsulated motor according to any one of claims 1-7, characterized in that, The encapsulated stator (1) has a snap-fit ​​groove (4) at one end of the end cap (2), which is used to snap the power cord.

9. An assembly method for a plastic-encapsulated motor according to any one of claims 1-8, characterized in that, The assembly method includes: First, connect one end of the power cord to the connector. Second, pass the power cord through the sealing element (3) through the through hole (202); Third, the sealing element (3) is sealed and fixed inside the through hole (202); Fourth, the end cap (2) is sealed and connected to the plastic-sealed stator (1).

10. The assembly method according to claim 9, characterized in that, One end of the encapsulated stator (1) is provided with a snap-fit ​​groove (4); One end of the power cord is electrically connected to the plastic-encapsulated stator (1), including fixing the power cord in the snap-fit ​​groove (4) first, and then welding the power cord to the wiring part.

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