Brushless motor and circulating pump using same

Abstract

The utility model discloses a brushless motor and a circulating pump using the same, and the brushless motor comprises a plastic package stator which is provided with a hollow stator cavity, and one shaft side end of the hollow stator cavity is provided with an opening; the rotor shell assembly comprises an end cover shell and a rotor; the end cover shell is used for being connected with the opening of the plastic package stator in a sealing and matching manner; the rotor is arranged on the end cover shell and is suitable for being partially inserted into the hollow stator cavity; the terminal assembly comprises a terminal shell integrally arranged on the outer side wall of the plastic package stator, a connecting wire used for being matched with the terminal shell in an inserted mode, and a protective shell covering the outer layer of a connector where the connecting wire is connected with the terminal shell in an inserted mode; wherein the plugging matching direction of the joint and the terminal shell is not parallel to the axial direction of the plastic package stator; at least part of the circumferential edge, facing the end face of the connecting wire, of the terminal shell abuts against the protective shell. According to the utility model, the waterproof performance of the whole brushless motor can be improved, so that the problem that the service life of the brushless motor is affected due to water seepage can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a brushless motor and a circulating pump using the same. Background Technology

[0002] Currently, the brushless motor circulation pumps used in home appliances such as washing machines or floor scrubbers have been found to be prone to water ingress after prolonged use. This water can seep into the motor through the gap between the stator housing and the motor end cover located on one side of the stator shaft. This can lead to problems such as rusting of internal components due to water seepage, bearing seizure, and even motor burnout in severe cases, thus shortening the motor's lifespan.

[0003] Furthermore, an essential component of the brushless motor used in the circulating pump is the external connecting wire. This external connecting wire connects to the stator through the cooperation of the terminal shell on the stator frame and the wiring shell on the connecting wire. In conventional technology, the mating position formed by the terminal shell and the wiring shell is usually exposed. Due to this structure, when water leakage occurs during operation, water will flow into the motor through the mating position formed by the terminal shell and the wiring shell, causing the motor to short-circuit and burn out. Moreover, the exposed terminal shell and wiring shell are easily damaged by external impacts, thus shortening their service life.

[0004] Based on the above, and considering the need to improve the overall waterproof performance of brushless motors to extend their service life, it is necessary to optimize the waterproof design of brushless motors. Utility Model Content

[0005] The primary objective of this invention is to provide a brushless motor to address the technical problem of optimizing its waterproof performance.

[0006] The primary objective of this invention is to provide a circulating pump that addresses the technical problem of optimizing the waterproof performance of the brushless motor it employs.

[0007] The brushless motor of this invention is implemented as follows:

[0008] A brushless motor, comprising:

[0009] A plastic-encapsulated stator having a hollow stator cavity, wherein an open opening is formed at one axial end of the hollow stator cavity;

[0010] A rotor housing assembly, comprising an end cap shell for sealingly engaging with an open end of a plastic-encapsulated stator and a rotor disposed on the end cap shell and adapted to be partially inserted into a hollow stator cavity;

[0011] A terminal assembly includes a terminal housing integrally disposed on the outer side wall of a plastic-encapsulated stator, a connecting wire for insertion and mating with the terminal housing, and a protective shell covering the connector layer of the connector and the terminal housing for insertion and mating; wherein the direction of insertion and mating between the connector and the terminal housing is not parallel to the axial direction of the plastic-encapsulated stator; and at least a portion of the circumferential edge of the terminal housing facing the end face of the connecting wire abuts against the protective shell.

[0012] In an optional embodiment of this utility model, a sealing ring is provided between the end cap shell and the open end of the plastic-sealed stator.

[0013] In an optional embodiment of this utility model, the end cap shell has an annular extension wall on its end face facing the plastic-encapsulated stator, and a stepped end face facing the rotor; and

[0014] The outer circumferential wall of the end of the plastic-encapsulated stator facing the end cap has a reduced diameter section, and a step is formed between the outer wall of the reduced diameter section and the outer wall of the plastic-encapsulated stator.

[0015] The sealing ring is adapted to be clamped and fixed between the extension wall and the reduced diameter section.

[0016] In an optional embodiment of this invention, the encapsulated stator and the end cap shell are connected by a first snap-fit ​​assembly suitable for snap-fitting.

[0017] In an optional embodiment of this invention, the protective shell and the terminal shell are connected by a second snap-fit ​​assembly suitable for snap-fit ​​engagement.

[0018] In an optional embodiment of this utility model, the second snap-fit ​​assembly includes a pair of fasteners disposed on the protective shell and a pair of snap-fit ​​blocks disposed on the outer side wall of the terminal shell, which are adapted to engage with the fasteners one-to-one.

[0019] In an optional embodiment of this utility model, a hydrophobic opening is formed between the lower edge of the circumferential edge of the terminal shell facing the end face of the connecting wire and the protective shell, corresponding to the gravity direction of the brushless motor.

[0020] In an optional embodiment of this invention, the hydrophobic opening is formed on the terminal housing and / or protective housing.

[0021] In an optional embodiment of this invention, a waterproof cap is formed on the isometric end of the encapsulated stator away from the end cover.

[0022] In an optional embodiment of this invention, a raised water-blocking portion is provided at least partially on the outer wall of the protective shell and on the circumferential side surrounding the end of the protective shell away from the terminal shell.

[0023] The circulating pump of this invention is implemented as follows:

[0024] A circulating pump includes: the brushless motor.

[0025] By adopting the above technical solution, this utility model has the following beneficial effects: Firstly, the brushless motor and circulating pump using this utility model prevent water from seeping into the hollow stator cavity through the sealed connection between the end cover shell and the plastic-encapsulated stator. Secondly, the protective shell design covering the connector where the connecting wires and terminal shells are inserted serves two purposes: firstly, it provides impact protection for the connection points, and secondly, it prevents water from seeping into the terminal shells. This structure improves the overall waterproof performance of the brushless motor, thus avoiding the problem of water seepage affecting the service life of the brushless motor. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of the brushless motor of this utility model;

[0027] Figure 2 This is a second-view structural schematic diagram of the brushless motor of this utility model;

[0028] Figure 3 This is an exploded view of the brushless motor of this utility model.

[0029] Figure 4 This is a schematic diagram of the sealing fit structure between the encapsulated stator and the end cover shell of the brushless motor of this utility model.

[0030] Figure 5 This is a first-view structural schematic diagram of the protective shell for the brushless motor of this utility model.

[0031] Figure 6 This is a second-view structural diagram of the protective shell for the brushless motor of this utility model.

[0032] Figure 7 This is a schematic diagram illustrating the waterproof effect of the waterproof cover for the brushless motor of this utility model.

[0033] Figure 8 This is a schematic diagram illustrating the waterproofing effect of the water-blocking part of the brushless motor of this utility model.

[0034] In the diagram: 1. Plastic-encapsulated stator; 11. Hollow stator cavity; 12. Reduced diameter section; 13. Step; 14. Clip; 2. End cover shell; 21. Extension wall; 22. Stepped surface; 23. Clip; 4. Terminal shell; 41. Clip block; 51. Connecting wire; 52. Connector; 6. Protective shell; 61. Fastener; 7. Drainage opening; 71. Groove; 8. Waterproof cover; 81. Vent hole; 91. Water baffle; 92. Water baffle rib; 100. Rotor; 200. Sealing ring. Detailed Implementation

[0035] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0036] Example 1:

[0037] Please see Figures 1 to 8 As shown, this embodiment provides a brushless motor, including: a plastic-encapsulated stator 1, a rotor 100 housing assembly, and a terminal assembly used in conjunction.

[0038] Specifically, the first is a plastic-sealed stator 1, which has a hollow stator cavity 11, and an open opening is formed at one axial end of the hollow stator cavity 11.

[0039] Secondly, there is the rotor 100 housing assembly, which includes an end cap 2 for sealingly engaging with the open end of the encapsulated stator 1, and a rotor 100 disposed on the end cap 2 and adapted to be partially inserted into the hollow stator cavity 11.

[0040] Based on the above, it should be noted that, regarding the sealing fit between the encapsulated stator 1 and the end cover shell 2, in one optional case, a sealing ring 200 is provided between the end cover shell 2 and the open end of the encapsulated stator 1. Based on this, referring to the accompanying drawings, in one optional embodiment, the end cover shell 2 has an annular extension wall 21 facing the encapsulated stator 1, with a stepped surface 22 facing the rotor 100; and the circumferential outer wall of the end of the encapsulated stator 1 facing the end cover shell 2 forms a reduced diameter section 12, and a step 13 is formed between the outer wall of the reduced diameter section 12 and the outer wall of the encapsulated stator 1; the sealing ring 200 is adapted to be clamped and fixed between the extension wall 21 and the reduced diameter section 12. Specifically, taking the cylindrical encapsulated stator 1 as an example, the outer diameter of the reduced diameter section 12 is smaller than the outer diameter of other parts of the encapsulated stator 1. Based on the above, the radial dimension of the sealing ring 200 is limited between the inner wall of the extension wall 21 and the outer wall of the reduced diameter section 12, while the axial dimension of the sealing ring 200 is limited between the step 13 formed by the reduced diameter section 12 and the plastic-encapsulated stator 1 and the step surface 22 formed by the extension wall 21 relative to the end cover shell 2.

[0041] Furthermore, it is necessary to explain that, for the secure connection between the encapsulated stator 1 and the end cap 2, in one optional configuration, the encapsulated stator 1 and the end cap 2 are connected by a first snap-fit ​​assembly suitable for engaging. This snap-fit ​​assembly can be any mature method from the prior art, such as, but not limited to, the one shown in the accompanying drawings of this embodiment, where the end cap 2 has a protruding snap-fit ​​member 23 at its end facing the encapsulated stator 1, suitable for connecting to the outer side wall of the encapsulated stator 1 and having a snap-fit ​​hole, and a protruding snap-fit ​​head 14 on the outer side wall of the encapsulated stator 1, suitable for engaging with the snap-fit ​​hole.

[0042] Furthermore, there is a terminal assembly, which includes a terminal housing 4 integrally disposed on the outer side wall of the molded stator 1, a connecting wire 51 for insertion and mating with the terminal housing 4, and a protective shell 6 covering the connector 52 that connects the connecting wire 51 to the terminal housing 4; wherein the direction of insertion and mating between the connector 52 and the terminal housing 4 is not parallel to the axial direction of the molded stator 1; at least part of the circumferential edge of the terminal housing 4 facing the end face of the connecting wire 51 abuts against the protective shell 6. Preferably, the direction of insertion and mating between the connector 52 and the terminal housing 4 is perpendicular to the axial direction of the molded stator 1, which facilitates processing.

[0043] Regarding the engagement between the protective shell 6 and the terminal shell 4, the protective shell 6 and the terminal shell 4 are connected by a second snap-fit ​​assembly suitable for engaging. Referring to the accompanying drawings, in one optional embodiment, the second snap-fit ​​assembly includes a pair of fasteners 61 disposed on the protective shell 6 and a pair of latching blocks 41 disposed on the outer wall of the terminal shell 4, suitable for engaging one-to-one with the fasteners 61. The fasteners 61 protrude from the end of the protective shell 6 facing the terminal shell 4. This ensures that the circumferential edge of the terminal shell 4 facing the end face of the connecting line 51, at least partially abutting against the protective shell 6, is not interfered with or affected by the second snap-fit ​​assembly.

[0044] Based on the above, it should also be noted that, in one specific optional implementation, a drainage opening 7 is formed between the lower edge of the circumferential edge of the terminal housing 4 facing the end face of the connecting line 51, corresponding to the direction of gravity of the brushless motor, and the protective housing 6. Specifically, regarding the direction of gravity of the brushless motor, if the drainage opening 7 is located at the bottom, water will only flow downwards under gravity and will not flow into the terminal housing 4 from the drainage opening 7. Therefore, when the brushless motor is used vertically with its rotor 100 axis as the direction of gravity and when it is used horizontally with its axis perpendicular to the rotor 100 axis as the direction of gravity, the drainage opening 7 is formed at different positions on the circumferential edge of the terminal housing 4 facing the end face of the connecting line 51.

[0045] Based on the above, this embodiment, in conjunction with the accompanying drawings, illustrates the case where the brushless motor is used horizontally with its axial direction perpendicular to the rotor 100 as the direction of gravity. In this angle, the drainage opening 7 of the brushless motor is located on the downward-facing mating surface formed by the terminal housing 4 and the protective housing 6. Thus, when water flows from above to the brushless motor, the water will not flow backward through the drainage opening 7 into the terminal housing 4 due to the property of water flowing downwards. Furthermore, regarding the mating surface formed by the terminal housing 4 and the protective housing 6 on the circumferential side, except for the drainage opening 7, the other parts of the terminal housing 4 and the protective housing 6 form an abutting fit. Even if water seeps in from the abutting surface of the terminal housing 4 and the protective housing 6, the downward flow of water will cause the seepage to flow out through the drainage opening 7, thus preventing water accumulation on the mating surface of the protective housing 6 and the terminal housing 4. Based on this, in another optional implementation, it is necessary to explain that, regarding the terminal housing 4 provided on the outer wall of the plastic-encapsulated stator 1, when the direction of the insertion and engagement of the connector 52 and the terminal housing 4 is perpendicular to the axial direction of the plastic-encapsulated stator 1, the direction of the insertion and engagement of the connector 52 and the terminal housing 4 is obliquely upward relative to the bottom end of the horizontally positioned brushless motor. In this way, even if water seeps in from the mating surface between the terminal housing 4 and the protective shell 6, the water cannot flow into the terminal housing 4 along the obliquely upward path.

[0046] Regarding the hydrophobic opening 7 in this embodiment, generally speaking, the hydrophobic opening 7 is formed on the terminal housing 4 and / or the protective housing 6. That is to say, there are three ways in which the hydrophobic opening 7 is formed. Here, we will illustrate one specific case with reference to the accompanying drawings:

[0047] From a manufacturing convenience perspective, the mating surfaces of both the terminal housing 4 and the protective housing 6 are designed as rectangular. Based on this, one edge of each mating surface of the terminal housing 4 and the protective housing 6 is designed as a slightly recessed groove 71 relative to the other edges. When the terminal housing 4 and the protective housing 6 are assembled, the grooves 71 on the terminal housing 4 and the protective housing 6 correspond to form a hydrophobic opening 7. Of course, the same design can be applied to mating surfaces of other shapes of terminal housings 4 and protective housings 6, which will not be listed in this embodiment.

[0048] Next, it should be noted that, in order to ensure the overall waterproof effect of the encapsulated stator 1, a waterproof cover 8 is formed on the axial end of the encapsulated stator 1 away from the end cover. Based on this, when the end cover shell 2 and the encapsulated stator 1 are properly sealed, the overall hollow stator cavity 11 can form a relatively sealed waterproof cavity.

[0049] In summary, for the brushless motor of this embodiment, firstly, the sealed connection between the end cover 2 and the plastic-encapsulated stator 1 prevents water from seeping into the hollow stator cavity 11; secondly, the protective shell 6 covering the connector 52 where the connecting wire 51 and the terminal shell 4 are inserted serves two purposes: firstly, it provides impact protection for the connection point between the connecting wire 51 and the terminal shell 4, and secondly, it prevents water from seeping into the terminal shell 4. This structure improves the overall waterproof performance of the brushless motor, thereby avoiding the problem of short circuits caused by water seepage affecting the service life of the brushless motor.

[0050] Example 2:

[0051] Please see Figures 1 to 8 As shown, based on the brushless motor of Embodiment 1, the brushless motor provided in this embodiment has the same general shape as that of Embodiment 1. This embodiment modifies the design of the waterproof cover 8, specifically:

[0052] This section primarily focuses on the application of the brushless motor in a horizontally positioned circulating pump. The waterproof cover 8, relative to the axial end of the encapsulated stator 1 furthest from the end cover, is a raised, round shape. A perforated vent 81 is designed on the waterproof cover 8. The vent 81 can be circular, square, or other shapes. In this embodiment, a semi-circular vent 81 is used as an example, and this semi-circular vent 81 occupies half the area of ​​the entire circular waterproof cover 8. Based on this, when the brushless motor is used horizontally, the vent 81 is located below the brushless motor's gravity on the waterproof cover 8. Because the waterproof cover 8 is raised, utilizing the property of water flowing downhill, water will flow along the outer surface of the waterproof cover 8. Upon reaching the vent 81, it will continue to flow downwards (e.g., ...). Figure 7 As shown in the direction of the water flow path F1, the hollow stator cavity 11 is perpendicular to the direction of the downward flow of water, so water will not enter the hollow stator cavity 11.

[0053] In this embodiment, the design of the exhaust port 81 prevents the brushless motor from being unable to expel internal air in time due to the small gaps between parts during installation, thus preventing it from being quickly assembled. In other words, the design of the exhaust port 81 facilitates the rapid exhaust of air during the assembly of the brushless motor.

[0054] Example 3:

[0055] Please see Figures 1 to 8 As shown, based on the brushless motor of Embodiment 1 or Embodiment 2, this embodiment also incorporates the following design:

[0056] A raised water-blocking portion is provided at least partially on the outer wall of the protective shell 6 and around the circumferential side of the protective shell 6 away from the terminal shell 4. The water-blocking portion here mainly serves to guide the water flow.

[0057] Specifically, referring to the attached diagram, one optional case is given. Taking a brushless motor used in a horizontal position as an example, and the end face of the protective shell 6 used to mate with the terminal shell 4 as rectangular, the water-blocking part includes a water-blocking plate 91 bent towards the terminal shell 4 on the outer wall of the protective shell 6 and above the direction of gravity of the brushless motor, and two protruding water-blocking ribs 92 respectively provided on the two sides of the protective shell 6 along the direction of gravity of the brushless motor. Preferably, the protruding area of ​​the water-blocking plate 91 relative to the protective shell 6 is larger than that of the water-blocking ribs 92, because the water-blocking ribs 92 mainly play a guiding role for the water flow from above. In this structure, the baffle plate 91 and the pair of baffle ribs 92 together form a U-shaped structure. This means that no baffle structure is provided on the side corresponding to the drainage opening 7, because the drainage opening 7 is located below the direction of gravity, and whether or not a baffle structure is provided does not affect the baffle effect. Of course, a baffle structure can also be provided on the side corresponding to the drainage opening 7; this embodiment is not absolutely limited. This ensures that as water flows downwards from the outer wall of the plastic-encapsulated stator 1, it will only flow downwards along the outer wall of the protective shell 6 due to the action of the baffle plate 91 and the pair of baffle ribs 92 (e.g., ...). Figure 8 The water flow path direction is shown in F2), and it will not flow to the opening of the protective shell 6 facing away from the terminal shell 4, which is suitable for the connecting wire 51 to pass through.

[0058] Example 4:

[0059] Based on the brushless motor of Embodiment 1, this embodiment provides a circulating pump that uses the brushless motor of Embodiment 1, Embodiment 2, or Embodiment 3. This circulating pump can be used in, for example, but not limited to, washing machines or floor scrubbers in household appliances. This embodiment does not make absolute limitations on its specific applicable scenarios.

[0060] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0061] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0064] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0065] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A brushless electric motor characterized by, The brushless motor comprises: a plastic-sealed stator having a hollow stator cavity, and one axial end of the hollow stator cavity is formed with an open mouth; a rotor housing assembly comprising an end cover shell for sealingly mating with the open mouth of the plastic-sealed stator, and a rotor arranged on the end cover shell and adapted to be partially inserted into the hollow stator cavity; a terminal assembly comprising a terminal shell integrally arranged on an outer lateral wall of the plastic-sealed stator, a connecting wire for plug-in mating with the terminal shell, and a protective shell covering an outer layer of the joint of the connecting wire and the terminal shell; wherein the plug-in mating direction of the joint and the terminal shell is non-parallel to the axial direction of the plastic-sealed stator; and a circumferential edge of the terminal shell facing the end face of the connecting wire at least partially abuts against the protective shell.

2. The brushless motor of claim 1, wherein, A sealing ring is arranged between the end cover shell and the open mouth of the plastic-sealed stator.

3. The brushless motor of claim 2, wherein, An extension wall in the form of a ring and having a stepped face facing the end face of the rotor is arranged on the end face of the end cover shell facing the plastic-sealed stator; and A reduced diameter section is formed on the circumferential outer lateral wall of the end portion of the plastic-sealed stator, and a step is formed between the outer lateral wall of the reduced diameter section and the outer lateral wall of the plastic-sealed stator. The sealing ring is adapted to be clamped and fixed between the extension wall and the reduced diameter section.

4. A brushless electric motor according to any one of claims 1 to 3, characterised in that, The plastic-sealed stator and the end cover shell are connected through a first clamping assembly adapted for clamping.

5. The brushless motor of claim 1, wherein, The protective shell and the terminal shell are connected through a second clamping assembly adapted for clamping.

6. The brushless motor of claim 5, wherein, The second clamping assembly comprises a pair of clamping pieces arranged on the protective shell and a pair of clamping blocks adapted for one-to-one clamping with the clamping pieces and arranged on the outer lateral wall of the terminal shell.

7. A brushless motor according to any one of claims 1 or 5 or 6, characterized in that, A hydrophobic opening is formed between the lower end edge of the circumferential edge of the terminal shell facing the end face of the connecting wire and the protective shell corresponding to the direction of gravity of the brushless motor.

8. The brushless motor of claim 7, wherein, The hydrophobic opening is formed on the terminal shell and / or the protective shell.

9. The brushless motor of claim 1, wherein, A waterproof cover is formed on the axial end of the plastic-sealed stator away from the end cover.

10. The brushless motor of claim 1, wherein, A raised water-blocking portion is at least partially arranged on the outer lateral wall of the protective shell and around the circumferential side of the end portion of the terminal shell away from the end cover.

11. A circulation pump characterized by, The brushless motor as claimed in any one of claims 1 to 10. ​

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