electric machine

Abstract

The utility model provides a kind of motor, comprising: stator, stator includes stator shell, stator shell includes shell end face and annular protrusion being extended and arranged along the direction away from shell end face, annular protrusion includes protrusion outer circumferential surface and protrusion inner circumferential surface;End cover, end cover is installed in one end of stator shell, and annular recess is provided on end cover and is inserted with annular protrusion Matching cooperation;First sealing element, it is clamped between annular protrusion and annular recess, to solve the problem that the operation of the waterproof mode of motor in prior art is complex and production efficiency is lower.

Description

Technical Field

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

[0002] Electric motors are widely used in modern society, covering many fields such as industrial electrical appliances, household appliances, transportation, and aerospace. This results in a wide variety of environments in which electric motors are used. When electric motors are used in harsh environments, appropriate protective measures are needed to extend their service life.

[0003] When motors need to meet high waterproof requirements, the existing protection methods mostly involve applying waterproof adhesive to the parts of the motor that are prone to water ingress to seal them and achieve the waterproof requirements. However, silicone has a high fluidity, and the amount of adhesive used and the uniformity of application need to be precisely controlled during the operation. This not only increases the complexity of the operation, but also prolongs the production cycle and reduces production efficiency. Utility Model Content

[0004] The main objective of this invention is to provide a motor that solves the problems of complex operation and low production efficiency of waterproofing methods in existing motors.

[0005] To achieve the above objectives, according to one aspect of the present invention, an electric motor is provided, comprising: a stator, the stator including a stator housing, the stator housing including a housing end face and an annular protrusion extending in a direction away from the housing end face, the annular protrusion including an outer peripheral surface and an inner peripheral surface; an end cover, the end cover being mounted on one end of the stator housing, the end cover being provided with an annular groove that engages with the annular protrusion; and a first sealing member sandwiched between the annular protrusion and the annular groove.

[0006] Further, the first sealing element is a sealing ring, which includes: a first ring body, including a first top surface, a first bottom surface and a first outer wall surface, the first top surface being used to contact the bottom surface of the annular groove, the first bottom surface being used to contact the top surface of the annular protrusion, and the first outer wall surface being used to contact the inner wall of the annular groove; and a second ring body, which is perpendicular to and connected to the first ring body at one end, the second ring body including a first outer side surface and a first inner side surface, the first outer side surface being used to contact the outer wall of the annular groove, and the first inner side surface being used to contact the outer peripheral surface of the annular protrusion.

[0007] Furthermore, the first sealing element includes: a third ring body, which is perpendicular to and connected to the other end of the first ring body, and the third ring body is opposite to and spaced apart from the second ring body. Each of the third ring bodies includes a second outer side surface and a second inner side surface. The second outer side surface is used to contact the inner wall of the groove of the annular groove, and the second inner side surface is used to contact the inner circumferential surface of the annular protrusion.

[0008] Furthermore, the annular protruding outer shell end face is also provided with multiple clearance grooves for avoiding the valve needle. The multiple clearance grooves are circumferentially spaced around the inner circumferential surface of the protrusion. The third ring body is provided with multiple positioning grooves corresponding to the clearance grooves. Each positioning groove is recessed from the center line of the first seal towards the direction close to the second ring body, so that when the first seal is installed on the end face of the outer shell, each positioning groove is fitted into the corresponding clearance groove.

[0009] Furthermore, the stator housing is provided with a lead wire groove for leading out the lead wire. The lead wire groove is located on the side of the stator housing near the end face of the housing and extends in a direction away from the end face of the housing. The motor also includes a second seal provided at the lead wire groove, and the second seal is provided with a wire passage hole for the lead wire to pass through.

[0010] Furthermore, the second seal also includes: a connecting portion, at least part of which is disposed on the lead wire groove; a lead wire portion connected to the connecting portion and extending toward the body of the second seal away from the rotation axis of the motor; wherein a wire passage hole is provided through the connecting portion and the lead wire portion.

[0011] Furthermore, the connecting part includes an inner limiting part, a plug-in part, and an outer limiting part connected sequentially in a direction away from the rotation axis of the motor. The plug-in part is used to plug into the lead groove. The inner limiting part and the outer limiting part are located on the inner and outer sides of the stator housing, respectively. The lead part is connected to the outer limiting part.

[0012] Furthermore, the stator housing also includes an outer peripheral surface and an inner peripheral surface. The outer peripheral surface is located on the side of the stator housing away from the rotation axis of the motor and is connected to the raised outer peripheral surface through the end face of the housing. The inner peripheral surface is located on the side of the stator housing close to the rotation axis of the motor and is coplanar with the raised inner peripheral surface. And / or, the lead groove includes a first groove segment and a second groove segment connected sequentially along the direction away from the rotation axis of the motor. A first groove wall is provided on the side of the first groove segment close to the second groove segment. The first groove wall is located between the outer peripheral surface and the inner peripheral surface of the housing. The inner limiting part is also provided with an inner contact surface for connecting with the first groove wall surface. The inner contact surface is a first arc-shaped surface corresponding to the shape of the first groove wall surface. The outer limiting part is also provided with an outer contact surface for contacting the outer peripheral surface of the housing. The outer contact surface is a second arc-shaped surface corresponding to the shape of the outer peripheral surface of the housing.

[0013] Furthermore, the connecting portion also includes an elastic protrusion provided on the plug portion, the elastic protrusion being located on the side of the bottom surface of the plug portion away from the lead groove, for abutting against the end cap.

[0014] Furthermore, the height of the elastic protrusion is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0015] Applying the technical solution of this utility model, the motor of this utility model includes: a stator, the stator including a stator housing, the stator housing including a housing end face and an annular protrusion extending in a direction away from the housing end face, the annular protrusion including an outer peripheral surface and an inner peripheral surface; an end cover, the end cover being installed at one end of the stator housing, the end cover having an annular groove for interlocking with the annular protrusion; and a first sealing member, sandwiched between the annular protrusion and the annular groove. The provision of the first sealing member in this application significantly improves the waterproof performance of the motor, and the first sealing member is designed to fully fill the gap between the stator and the end cover, effectively preventing water seepage even under high-pressure water washing or harsh weather conditions. This first seal provides waterproofing and protects the internal components of the motor from damage. Compared to traditional waterproofing processes, such as applying waterproof adhesive, the operation of this first seal is simpler, reducing assembly time and labor costs, and improving production line efficiency. In addition, due to the elastic properties of the first seal, it can maintain a good sealing effect even when vibrations occur during motor operation, improving the overall stability of motor operation. The first seal is also easy to maintain, allowing for easy replacement during subsequent maintenance or repair work, reducing maintenance costs, extending the service life of the motor, and effectively solving the problems of complex operation and low production efficiency of existing motor waterproofing methods. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the overall structure of an embodiment of the motor according to the present invention is shown;

[0018] Figure 2 A schematic diagram of a first embodiment of the first seal in the motor is shown;

[0019] Figure 3 It shows Figure 2 A cross-sectional view of a first embodiment of the first seal shown;

[0020] Figure 4 A schematic diagram of a second embodiment of the first seal in the motor is shown;

[0021] Figure 5 It shows Figure 4 A cross-sectional view of a second embodiment of the first seal shown;

[0022] Figure 6 A schematic diagram of a third embodiment of the first seal in the motor is shown;

[0023] Figure 7 A schematic diagram of the structure of the motor's middle end cover is shown;

[0024] Figure 8 A schematic diagram of the lead groove in the motor is shown;

[0025] Figure 9 A schematic diagram of the structure of the second seal in the motor is shown;

[0026] Figure 10 A partial cross-sectional view is shown of a first embodiment of the first seal installed on a motor;

[0027] Figure 11 It shows Figure 10 The enlarged view of point B shown;

[0028] Figure 12 A partial cross-sectional view is shown when a second embodiment of the first seal is installed on a motor;

[0029] Figure 13 It shows Figure 12 A magnified view of a portion at point A shown.

[0030] The above figures include the following reference numerals:

[0031] 10. Stator; 110. Stator housing; 111. Protruding outer peripheral surface; 112. Protruding inner peripheral surface; 113. Housing end face; 1131. Housing outer peripheral surface; 1132. Housing inner peripheral surface;

[0032] 114. Annular protrusion; 1141. Clearance groove; 115. Lead wire groove;

[0033] 1151. First tank section; 1152. Second tank section; 1153. First tank wall;

[0034] 20. Rotor; 30. End cover; 310. Annular groove; 311. Bottom surface of the groove; 312. Inner wall of the groove; 313. Outer wall of the groove.

[0035] 40. First sealing element; 410. First ring body; 411. First top surface; 412. First bottom surface; 413. First outer wall surface;

[0036] 420. Second ring body; 421. First outer surface; 422. First inner surface;

[0037] 430. Third ring body; 431. Second outer surface; 432. Second inner surface; 4301. Positioning groove;

[0038] 50. Second seal; 501. Wire hole; 510. Lead wire section; 520. Connecting section;

[0039] 521. Inner limiting part; 522. Insertion part; 5221. Elastic protrusion; 523. Outer limiting part. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] like Figures 1 to 13 As shown, the motor of this application includes: a stator 10, the stator 10 including a stator housing 110, the stator housing 110 including a housing end face 113 and an annular protrusion 114 extending in a direction away from the housing end face 113, the annular protrusion 114 including an outer peripheral surface 111 and an inner peripheral surface 112; an end cover 30, the end cover 30 being installed at one end of the stator housing 110, the end cover 30 being provided with an annular groove 310 that engages with the annular protrusion 114; and a first sealing member 40, sandwiched between the annular protrusion 114 and the annular groove 310.

[0042] Thus, the first seal 40 in this application significantly improves the waterproof performance of the motor. The first seal 40 is designed to fully fill the gap between the stator 10 and the end cover 30, effectively preventing water penetration even under high-pressure water washing or harsh weather conditions, protecting the internal components of the motor from damage. Compared to traditional waterproofing processes, such as applying waterproof adhesive, the operation of the first seal 40 in this application is simpler, reducing assembly time and labor costs, and improving production line efficiency. Furthermore, due to the elastic properties of the first seal 40, it maintains a good sealing effect even during vibrations generated during motor operation, improving the overall stability of motor operation. The first seal 40 is also easy to maintain, allowing for easy replacement during subsequent repairs or maintenance, reducing maintenance costs, extending the motor's service life, and effectively solving the problems of complex operation and low production efficiency in existing motor waterproofing methods.

[0043] like Figure 2 and Figure 3 , Figure 7As shown, in a first embodiment of the first sealing element 40 of this application, the first sealing element 40 is a sealing ring. The first sealing element 40 includes: a first ring body 410, including a first top surface 411, a first bottom surface 412, and a first outer wall surface 413. The first top surface 411 is used to contact the bottom surface 311 of the annular groove 310, the first bottom surface 412 is used to contact the raised top surface of the annular protrusion 114, and the first outer wall surface 413 is used to contact the inner wall 312 of the annular groove 310; and a second ring body 420, which is perpendicular to and connected to one end of the first ring body 410. The second ring body 420 includes a first outer side surface 421 and a first inner side surface 422. The first outer side surface 421 is used to contact the outer wall 313 of the annular groove 310, and the first inner side surface 422 is used to contact the raised outer peripheral surface 111 of the annular protrusion 114.

[0044] The double-ring design of the first seal 40, especially the contact between the first ring 410 and the second ring 420, can significantly improve the waterproof capability of the motor. When the motor is working, even when faced with the impact of high-pressure water flow, it can effectively isolate external liquids and protect the motor's internal components from damage. Due to the precise fit between each surface of the first seal 40 and the stator housing 110 and end cover 30, this sealing ring design can not only resist external pressure, but also maintain a stable and reliable sealing effect during long-term use, reducing motor failures caused by seal failure.

[0045] Furthermore, the installation process of the first seal 40 in this application does not require additional tools or complicated operations. It only requires the seal ring to be correctly placed when the end cover 30 is combined with the stator housing 110, which greatly simplifies the motor assembly process, reduces production costs, and improves production efficiency.

[0046] like Figure 4 and Figure 5 , Figure 7 As shown, in a second embodiment of the first sealing member 40 of this application, the first sealing member 40 includes: a third ring body 430, the third ring body 430 being perpendicular to and connected to the other end of the first ring body 410, the third ring body 430 being opposite to and spaced apart from the second ring body 420, and each of the third ring bodies 430 including a second outer side surface 431 and a second inner side surface 432, the second outer side surface 431 being used to contact the inner wall 312 of the groove of the annular groove 310, and the second inner side surface 432 being used to contact the inner circumferential surface 112 of the annular protrusion 114.

[0047] This application adds a third ring 430 to the first ring 410 to form a double-sealing structure, which effectively improves the waterproof performance of the motor. Even if one of the first or third rings experiences slight wear or aging, the other ring can still maintain a good sealing effect, providing reliable protection for the internal components of the motor. Furthermore, the multi-faceted contact between the third ring 430 and the annular groove 310 and the annular protrusion 114 not only increases the contact area but also improves the stability of the seal. Even if the motor is affected by vibration or temperature changes during operation, the double-sealing structure can still maintain a tight fit and prevent liquid penetration.

[0048] Preferably, the design of the second outer side 431 and the second inner side 432 of the third ring body 430 in this application ensures a tight fit between the third ring body 430 and the annular groove 310 and the annular protrusion 114, thereby forming a more uniform and stable sealing effect and significantly improving the overall waterproof capability of the motor.

[0049] like Figure 6 and Figure 7 As shown, the annular protrusion 114 is also provided with a plurality of clearance grooves 1141 for avoiding the valve needle on the end face of the outer shell. The plurality of clearance grooves 1141 are circumferentially spaced around the inner circumferential surface 112 of the protrusion. The third ring body 430 is provided with a plurality of positioning grooves 4301 corresponding to the clearance grooves 1141. Each positioning groove 4301 is recessed from the center line of the first sealing member 40 toward the direction close to the second ring body 420, so that when the first sealing member 40 is installed on the end face 113 of the outer shell, each positioning groove 4301 is fitted into the corresponding clearance groove 1141.

[0050] This application significantly improves the positioning accuracy of the first seal 40 during installation by setting a positioning groove 4301 in the third ring body 430 and fitting it with the avoidance groove 1141, ensuring accurate installation of the sealing ring, avoiding installation offset problems, and thus improving the reliability of the seal.

[0051] Preferably, without sacrificing waterproof performance, the design of the clearance groove 1141 and the positioning groove 4301 allows special components such as valve needles to pass through, which ensures the functionality of the internal components of the motor and maintains the requirements of external waterproof sealing, thus achieving a combination of structural function and waterproof performance. Furthermore, the fitting of the positioning groove 4301 and the clearance groove 1141 not only enhances the positioning stability of the first seal 40, but also further improves the overall stability between the motor end cover and the stator through multi-point contact, so as to maintain a good sealing effect even under complex or changing working conditions.

[0052] like Figure 8As shown, the stator housing 110 is provided with a lead wire groove 115 for leading out the lead wire. The lead wire groove 115 is located on the side of the stator housing 110 near the housing end face 113 and extends in a direction away from the housing end face 113. The motor also includes a second seal 50 provided at the lead wire groove 115. The second seal 50 is provided with a wire passage hole 501 for the lead wire to pass through.

[0053] This application, by providing a second seal 50 in the lead wire groove 115 and a wire passage hole 501 on the seal, not only ensures the normal connection of the lead wire but also effectively prevents moisture from seeping in from the lead wire inlet, thereby significantly improving the waterproof performance of the motor in humid or wet environments. The second seal 50 simplifies the sealing installation between the lead wire and the stator housing 110, reducing the need for additional sealing materials. Furthermore, due to the independence of the second seal 50, it can be replaced or inspected directly without disassembling the entire motor, greatly facilitating maintenance and upkeep.

[0054] like Figure 9 As shown, the second seal 50 further includes: a connecting portion 520, at least a portion of which is disposed on the lead wire groove 115; a lead wire portion 510, which is connected to the connecting portion 520 and extends toward the body of the second seal 50 away from the rotation axis of the motor; wherein, a wire hole 501 is provided through the connecting portion 520 and the lead wire portion 510.

[0055] By dividing the second seal 50 into a connecting part 520 and a lead wire part 510, and allowing the wire hole 501 to pass through both parts, it is ensured that the lead wire is protected not only when it passes through the stator housing, but also that it maintains a consistent waterproof effect throughout the entire lead wire path, significantly improving the waterproof performance of the motor. Furthermore, the design of the lead wire part 510 not only helps with waterproofing, but also prevents the lead wire from loosening or wearing during motor operation to a certain extent, ensuring the stability of the lead wire and thus improving the overall safety and reliability of the motor.

[0056] Preferably, the wire hole 501 passes through the connecting part 520 and the lead wire part 510, so that it can accommodate lead wires of different specifications. At the same time, during installation or maintenance, the position of the lead wire part can be easily adjusted to adapt to changes in the internal space of the motor or special requirements of lead wire wiring.

[0057] Specifically, the connecting part 520 includes an inner limiting part 521, a plug-in part 522, and an outer limiting part 523 connected sequentially in a direction away from the rotation axis of the motor. The plug-in part 522 is used to plug into the lead wire groove 115. The inner limiting part 521 and the outer limiting part 523 are located on the inner and outer sides of the stator housing 110, respectively. The lead wire part 510 is connected to the outer limiting part 523.

[0058] The dual-sided design of the inner limiting part 521 and the outer limiting part 523 provides stable limiting for the second seal 50, avoiding displacement of the seal due to vibration or thermal expansion and contraction during motor operation, thereby ensuring long-term waterproof sealing effect. In addition, the precise fit between the plug part 522 and the lead wire groove 115 ensures that the second seal can be accurately positioned during installation, reducing errors in manual operation and improving assembly efficiency.

[0059] By connecting the lead portion 510 to the outer limiting portion 523, this application enables the lead portion to extend in a direction away from the motor rotation axis, providing a longer waterproof path for the lead and further enhancing the waterproof capability of the motor lead portion.

[0060] like Figure 8 and Figure 9 As shown, the stator housing 110 further includes an outer peripheral surface 1131 and an inner peripheral surface 1132. The outer peripheral surface 1131 is located on the side of the stator housing 110 away from the rotation axis of the motor and is connected to the raised outer peripheral surface 111 through the housing end face 113. The inner peripheral surface 1132 is located on the side of the stator housing 110 close to the rotation axis of the motor and is coplanar with the raised inner peripheral surface 112. And / or, the lead groove 115 includes a first groove segment 1151 and a second groove segment 1152 connected sequentially along the direction away from the rotation axis of the motor. A first groove wall 1153 is provided on the side of 1151 near the second groove section 1152. The first groove wall 1153 is located between the outer peripheral surface 1131 and the inner peripheral surface 1132 of the outer shell. The inner limiting part 521 is also provided with an inner contact surface for connecting with the first groove wall 1153. The inner contact surface is a first arc-shaped surface that corresponds to the shape of the first groove wall 1153. The outer limiting part 523 is also provided with an outer contact surface for contacting the outer peripheral surface 1131 of the outer shell. The outer contact surface is a second arc-shaped surface that corresponds to the shape of the outer peripheral surface 1131 of the outer shell.

[0061] Preferably, the arc-shaped surface in this application, compared with the flat or straight contact surface, can provide a more uniform pressure distribution, reduce wear or aging of the seal caused by excessive local pressure, and extend the service life of the seal.

[0062] The design of the first and second arc-shaped surfaces, based on the structural characteristics of the stator housing 110, enables the second seal 50 to form a tighter and more uniform contact with the inner circumferential surface 1132 and the outer circumferential surface 1131 of the housing, significantly improving the reliability and consistency of the waterproof seal. Furthermore, the natural fit between the arc-shaped surface and the circumferential surface of the stator housing not only provides physical stability but also ensures, through the deformation and recovery capabilities of the elastic material, that the seal can maintain tight contact with the housing even under conditions of motor vibration or temperature changes, effectively preventing moisture from entering the interior from the side.

[0063] Specifically, the connecting portion 520 also includes an elastic protrusion 5221 provided on the plug portion 522. The elastic protrusion 5221 is located on the side of the bottom surface of the plug portion 522 away from the lead groove 115, so as to abut against the end cap 30.

[0064] By providing an elastic protrusion 5221 on the connection portion 520 of the second seal 50, a tight physical contact can be formed with the end cover 30 during installation, which significantly enhances the sealing integrity of the area and effectively prevents moisture from seeping in from the lead groove and the end cover interface. The elastic material protrusion can undergo elastic deformation when subjected to end cover pressure, but can return to its original shape after pressure is released. This characteristic enables it to maintain a good sealing effect during long-term use, improving the overall durability and waterproof reliability of the motor.

[0065] Preferably, the height of the elastic protrusion 5221 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm, ensuring that during the motor assembly process, the elastic protrusion 5221 can properly fill the gap between the second seal and the end cover, forming an effective compression, thereby significantly improving the sealing performance and effectively preventing moisture or humidity from seeping into the motor from this area.

[0066] Preferably, the motor of this application further includes a rotor 20, which is rotatably disposed within the stator 10.

[0067] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0068] The motor of this application includes: a stator 10, the stator 10 including a stator housing 110, the stator housing 110 including a housing end face 113 and an annular protrusion 114 extending in a direction away from the housing end face 113, the annular protrusion 114 including an outer peripheral surface 111 and an inner peripheral surface 112; an end cover 30, the end cover 30 being installed at one end of the stator housing 110, the end cover 30 being provided with an annular groove 310 that engages with the annular protrusion 114; and a first sealing member 40, sandwiched between the annular protrusion 114 and the annular groove 310.

[0069] As can be seen, the first seal 40 in this application significantly improves the waterproof performance of the motor. The first seal 40 is designed to fully fill the gap between the stator 10 and the end cover 30, effectively preventing water penetration even under high-pressure water washing or harsh weather conditions, protecting the internal components of the motor from damage. Compared to traditional waterproofing processes, such as applying waterproof adhesive, the operation of the first seal 40 in this application is simpler, reducing assembly time and labor costs, and improving production line efficiency. Furthermore, due to the elastic properties of the first seal 40, it maintains a good sealing effect even during vibrations generated during motor operation, improving the overall stability of motor operation. The first seal 40 is also easy to maintain, allowing for easy replacement during subsequent repairs or maintenance, reducing maintenance costs, extending the motor's service life, and effectively solving the problems of complex operation and low production efficiency in existing motor waterproofing methods.

[0070] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric motor, characterized in that, The motor includes: The stator (10) includes a stator housing (110), the stator housing (110) includes a housing end face (113) and an annular protrusion (114) extending in a direction away from the housing end face (113), the annular protrusion (114) includes an outer peripheral surface (111) and an inner peripheral surface (112). End cap (30), the end cap (30) is installed at one end of the stator housing (110), and the end cap (30) is provided with an annular groove (310) that is inserted into the annular protrusion (114). The first sealing element (40) is sandwiched between the annular protrusion (114) and the annular groove (310).

2. The motor according to claim 1, characterized in that, The first sealing element (40) is a sealing ring, and the first sealing element (40) includes: The first annular body (410) includes a first top surface (411), a first bottom surface (412) and a first outer wall surface (413). The first top surface (411) is used to contact the bottom surface (311) of the annular groove (310), the first bottom surface (412) is used to contact the top surface of the annular protrusion (114), and the first outer wall surface (413) is used to contact the inner wall (312) of the annular groove (310). The second ring body (420) is perpendicular to and connected to one end of the first ring body (410). The second ring body (420) includes a first outer side surface (421) and a first inner side surface (422). The first outer side surface (421) is used to contact the outer wall (313) of the groove of the annular groove (310), and the first inner side surface (422) is used to contact the outer peripheral surface (111) of the annular protrusion (114).

3. The motor according to claim 2, characterized in that, The first seal (40) includes: The third ring body (430) is perpendicular to and connected to the other end of the first ring body (410). The third ring body (430) is opposite to and spaced apart from the second ring body (420). The third ring body (430) includes a second outer side surface (431) and a second inner side surface (432). The second outer side surface (431) is used to contact the inner wall (312) of the groove of the annular groove (310). The second inner side surface (432) is used to contact the inner circumferential surface (112) of the annular protrusion (114).

4. The motor according to claim 3, characterized in that, The annular protrusion (114) is also provided with a plurality of clearance grooves (1141) for avoiding the valve needle. The plurality of clearance grooves (1141) are arranged circumferentially around the inner circumferential surface (112) of the protrusion at intervals. The third ring body (430) is provided with a plurality of positioning grooves (4301) corresponding to the clearance grooves (1141). Each positioning groove (4301) is recessed from the center line of the first seal (40) toward the direction close to the second ring body (420), so that when the first seal (40) is installed on the end face (113) of the outer shell, each positioning groove (4301) is fitted into the corresponding clearance groove (1141).

5. The motor according to claim 4, characterized in that, The stator housing (110) is provided with a lead wire groove (115) for leading out the lead wire. The lead wire groove (115) is located on the side of the stator housing (110) near the housing end face (113) and extends in a direction away from the housing end face (113). The motor also includes a second seal (50) provided at the lead wire groove (115). The second seal (50) is provided with a wire passage hole (501) for the lead wire to pass through.

6. The motor according to claim 5, characterized in that, The second seal (50) further includes: A connecting portion (520), at least a portion of which is disposed on the lead groove (115); The lead wire portion (510) is connected to the connecting portion (520), and the lead wire portion (510) extends toward the body of the second seal (50) away from the rotation axis of the motor. The wire hole (501) is provided through the connecting part (520) and the lead wire part (510).

7. The motor according to claim 6, characterized in that, The connecting part (520) includes an inner limiting part (521), a plug-in part (522) and an outer limiting part (523) connected in sequence along a direction away from the rotation axis of the motor. The plug-in part (522) is used to plug into the lead groove (115). The inner limiting part (521) and the outer limiting part (523) are located on the inner and outer sides of the stator housing (110) respectively. The lead part (510) is connected to the outer limiting part (523).

8. The motor according to claim 7, characterized in that, The stator housing (110) further includes an outer peripheral surface (1131) and an inner peripheral surface (1132). The outer peripheral surface (1131) is located on the side of the stator housing (110) away from the rotation axis of the motor and is connected to the raised outer peripheral surface (111) through the housing end face (113). The inner peripheral surface (1132) is located on the side of the stator housing (110) close to the rotation axis of the motor and is coplanar with the raised inner peripheral surface (112); and / or, The lead groove (115) includes a first groove segment (1151) and a second groove segment (1152) connected sequentially along a direction away from the rotation axis of the motor. A first groove wall surface (1153) is provided on the side of the first groove segment (1151) near the second groove segment (1152). The first groove wall surface (1153) is located between the outer peripheral surface (1131) of the outer shell and the inner peripheral surface (1132) of the outer shell. An inner contact surface for connecting with the first groove wall surface (1153) is also provided on the inner limiting part (521). The inner contact surface is a first arc-shaped surface corresponding to the shape of the first groove wall surface (1153). An outer contact surface for contacting the outer peripheral surface (1131) of the outer shell is a second arc-shaped surface corresponding to the shape of the outer peripheral surface (1131) of the outer shell.

9. The motor according to claim 7, characterized in that, The connecting portion (520) further includes an elastic protrusion (5221) disposed on the plug portion (522), the elastic protrusion (5221) being located on the side of the bottom surface of the plug portion (522) away from the lead groove (115) for abutting against the end cap (30).

10. The motor according to claim 9, characterized in that, The height of the elastic protrusion (5221) is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

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