WO2020228250A1 - 一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构 - Google Patents

一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构 Download PDF

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WO2020228250A1
WO2020228250A1 PCT/CN2019/113820 CN2019113820W WO2020228250A1 WO 2020228250 A1 WO2020228250 A1 WO 2020228250A1 CN 2019113820 W CN2019113820 W CN 2019113820W WO 2020228250 A1 WO2020228250 A1 WO 2020228250A1
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oil
plastic
end cover
lip
resistant
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PCT/CN2019/113820
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English (en)
French (fr)
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王苗森
倪炯利
王亮
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卧龙电气驱动集团股份有限公司
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Publication of WO2020228250A1 publication Critical patent/WO2020228250A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs

Definitions

  • the invention relates to the field of brushless DC motors, in particular to a sealing structure for waterproof oil and salt mist intrusion at the rotating shaft of a plastic-encapsulated brushless DC motor.
  • the existing plastic-encapsulated brushless DC motor has a gap between the shaft hole and the shaft.
  • water and oil will easily enter the bearing chamber along the shaft hole gap, causing the bearing to rust or Dirt accumulation in the bearing chamber and rust on the front end cover affect the service life of the motor.
  • the commonly used method is to install a water throwing ring or a plastic sleeve for the outer bearing housing, and spray or electrophoresize the surface of the front cover.
  • the above measures still cannot completely prevent water and oil from intruding.
  • the front cover will reduce the bearing after spraying or electrophoresis.
  • the accuracy of the chamber and the insulation of the coating make it impossible to weld and conduct the connecting wire terminals that are provided to prevent electrical corrosion of the bearing, causing failure, thereby affecting the life and reliability of the motor.
  • the technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, provide a plastic-encapsulated brushless DC motor shaft waterproof oil and salt spray intrusion seal structure to prevent corrosion of bearings and end covers, The purpose is to improve the life and reliability of the motor.
  • the present invention adopts the following technical solutions.
  • a sealing structure for water-proof oil and salt mist intrusion at the rotating shaft of a plastic-encapsulated brushless DC motor comprising a plastic-encapsulated stator shell, an end cover arranged in the plastic-encapsulated stator shell, a motor shaft extending from the center hole of the end cover, the end cover
  • the motor shaft extends from the bearing chamber of the end cover and passes through the center hole of the end cover and the center hole of the wear-resistant and oil-resistant rubber sealing ring in turn. Interference fit with the sealing lip; the sealing lip and the outer peripheral surface of the motor shaft are closed to form a surrounding oil groove, and the bearing grease is filled in between.
  • the wear-resistant and oil-resistant rubber sealing ring is used to cover the outer surface of the end cover, and is matched with the motor shaft through multiple sealing lips.
  • bearing grease which can effectively isolate the external salt spray environment or
  • the oily fume environment prevents corrosion on the outer surface of the end cover, prevents the risk of bearing rust or fouling caused by water and oil intruding into the bearing chamber, and eliminates the anti-corrosion treatment of plastic spraying or electrophoresis on the end cover, which can effectively realize the prevention
  • the welding conduction of the bearing electric corrosion wire assembly ensures the life and reliability of the motor; bearing grease can also reduce the friction coefficient between the sealing lip and the surface of the rotating shaft, and greatly reduce the friction aging of the sealing lip.
  • the present invention also includes the following additional technical features.
  • the cross section surrounding the oil groove is an included angle groove with a small arc transition at the bottom, and the included angle is between 60 degrees and 120 degrees. It can reduce the amount of grease filled, but can maintain the amount of grease on the contact surface with the motor shaft, and the lubrication effect is good.
  • the sealing lip includes an outer lip adjacent to the outer end of the motor shaft and an inner lip adjacent to the end cover.
  • the outer lip has a rectangular cross-sectional structure, and the inner end of the inner lip is coplanar with the top surface of the end cover. The structure is simplified and easy to manufacture.
  • a circumferential groove is provided between the outer lip and the outer end surface of the wear-resistant and oil-resistant rubber sealing ring.
  • the groove section is an included angle groove with a small arc transition at the bottom, and the included angle is between 60 degrees and 120 degrees. .
  • the groove can reduce the amount of material, and on the other hand, the elasticity of the outer lip can be in a better state.
  • the included angle between the outer lip and the motor shaft is 45 degrees, and the included angle between the outer surface of the inner lip and the inner surface of the outer lip is 90 degrees. This angle setting makes the optimization effect of the sealing lip structure better.
  • the lips of the outer lip and the inner lip are all rounded.
  • the contact surface between the circular arc corner lip and the shaft is small, and the wear resistance is good.
  • Figure 1 is an end view of the motor of the present invention.
  • Fig. 2 is a schematic cross-sectional view of A-A in Fig. 1 of the present invention.
  • Figure 3 is a schematic view of the structure of the wear-resistant and oil-resistant rubber seal ring of the present invention.
  • Fig. 4 is a schematic diagram of the connection between the anti-bearing electric corrosion lead assembly and the end cover of the present invention.
  • Fig. 5 is an enlarged schematic diagram of part B in Fig. 2 of the present invention.
  • a plastic-encapsulated brushless DC motor shaft for water-proof oil and salt mist intrusion seal structure including plastic-encapsulated stator housing 1, end cover arranged in the plastic-encapsulated stator housing 1, from the center of the end cover 2
  • the motor shaft 3 protruding from the hole, the end cover 2 is welded with the anti-bearing electric corrosion wire assembly 4, the plastic-encapsulated stator housing 1 and the end cover 2 are provided with a wear-resistant and oil-resistant rubber sealing ring 5, and a wear-resistant and oil-resistant rubber sealing ring 5 is installed.
  • the surplus is sheathed on the end cover 2 and completely covers the outer surface of the end cover 2; the center hole of the wear-resistant and oil-resistant rubber seal ring 5 is provided with two circumferential sealing lips 501, and the motor shaft 3 extends from the bearing chamber of the end cover 2 and passes through in turn
  • the center hole of the end cover 2 and the center hole of the wear-resistant and oil-resistant rubber sealing ring 5 are in an interference fit with the sealing lip 501; the two sealing lip 501 are closed with the outer peripheral surface of the motor shaft 3 to form a surrounding oil groove 503, which is filled with bearing grease.
  • the section surrounding the oil groove 503 is an included angle groove with a small arc transition at the bottom, and the included angle is 90 degrees.
  • the amount of grease filled can be reduced, but the amount of grease on the contact surface with the motor shaft 3 can be maintained, and the lubrication effect is good.
  • the sealing lip 501 includes an outer lip 50101 adjacent to the outer end of the motor shaft 3 and an inner lip 50102 adjacent to the end cover 2.
  • the outer lip 50101 has a rectangular cross-sectional structure, and the inner end of the inner lip 50102 is coplanar with the top surface of the end cover 2. The structure is simplified and easy to manufacture.
  • a circumferential groove 502 is provided between the outer lip 50101 and the outer end surface of the wear-resistant and oil-resistant rubber seal ring 5.
  • the section of the groove 502 is the included angle of the small arc transition at the bottom.
  • the angle of the groove and the included angle is 90 degrees.
  • the groove 502 can reduce the amount of material on the one hand, and on the other hand can make the elasticity of the outer lip 50101 in a better state.
  • the lips 504 of the outer lip 50101 and the inner lip 50102 are both rounded.
  • the arc-angle lip 504 has less contact surface with the rotating shaft, and the wear resistance effect is better.
  • the wear-resistant and oil-resistant rubber sealing ring 5 is used to cover the outer surface of the end cover 2 by interference, and is matched with the motor shaft 3 through multiple sealing lips 501.
  • the surrounding oil groove 503 between the sealing lips 501 is filled with bearing grease, which is effective Isolate the external salt spray environment or oily smoke environment, prevent the outer surface of the end cover 2 from corrosion, prevent water and oil from entering the bearing chamber and cause bearing rust or bearing chamber fouling risk, and avoid the plastic spraying or electrophoresis of the end cover 2.
  • the anti-corrosion treatment can effectively realize the welding conduction of the anti-bearing electric corrosion wire assembly 4, and ensure the life and reliability of the motor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，在塑封定子外壳（1）与端盖（2）之间嵌有过盈配合的耐磨耐油橡胶密封圈（5），耐磨耐油橡胶密封圈（5）中心孔设有内外两道密封唇（501）与电机转轴（3）过盈配合，内外两道密封唇（501）之间设有环绕油槽（503），其间填满轴承油脂。可有效隔绝外部盐雾环境或油烟环境，防止端盖（2）外表面出现腐蚀，防止轴承生锈或轴承室积垢风险，免去对端盖（2）的抗蚀处理，保证防轴承电腐蚀导线组件的焊接导通，确保电机寿命和可靠性。

Description

一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构 技术领域
本发明涉及无刷直流电机领域，尤其涉及一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构。
背景技术
目前，现有的塑封无刷直流电机，由于出轴孔与轴之间存在间隙，当应用于盐雾环境或油烟环境时，水油容易沿出轴孔间隙进入轴承室，导致轴承生锈或轴承室积垢，前端盖生锈，影响电机的使用寿命。目前常用方法是前端装甩水环或轴承室外套塑料套，并将前端盖表面喷塑或电泳，但上述措施仍无法完全隔绝水、油侵入，另外，前端盖喷塑或电泳后会降低轴承室精度，且涂层的绝缘性使得与设置的防轴承电腐蚀的连接导线端子无法焊接导通，造成失效，从而影响电机的寿命和可靠性。
发明内容
本发明要解决的技术问题和提出的技术任务是对现有技术方案进行完善与改进，提供一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，以防止轴承和端盖腐蚀，提高电机寿命和可靠性为目的。为此，本发明采取以下技术方案。
一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，包括塑封定子外壳、设于塑封定子外壳内的端盖、从端盖的中心孔伸出的电机转轴，所述的端盖外焊接有防轴承电腐蚀导线组件，所述的塑封定子外壳与端盖之间设有耐磨耐油橡胶密封圈，所述的耐磨耐油橡胶密封圈过盈外套于端盖并完全覆盖端盖外表面；耐磨耐油橡胶密封圈中心孔设有多道周向的密封唇，电机转轴从端盖的轴承室伸出，依次穿过端盖中心孔和耐磨耐油橡胶密封圈中心孔，并与密封唇过盈配合；密封唇与电机转轴的外周面封闭成环绕油槽，其间填满轴承油脂。通过耐磨耐油橡胶密封圈过盈覆盖外套于端盖外表面，并通过多道密封唇与电机转轴过盈相配，在密封唇间的环绕油槽填满轴承油脂，可有效隔绝外部盐雾环境或油烟环境，防止端盖外表面出现腐蚀，防止水、油侵入轴承室而造成轴承生锈或轴承室积垢风险，免去了对端盖的喷塑或电泳的抗蚀处理，能够有效实现防轴承电腐蚀导线组件的焊接导通，确保电机寿命和可靠性；轴承油脂也可以减小密封唇与转轴表面的摩擦系数，大大减轻密封唇的唇口摩擦老化。
作为对上述技术方案的进一步完善和补充，本发明还包括以下附加技术特征。
作为优选技术手段：所述的密封唇共2道，其间为环绕油槽。结构简单，可有效填充轴承油脂，隔绝内外环境。
所述的环绕油槽的截面为底部带小圆弧过渡的夹角槽，夹角的角度在60度到120度之间。可减少油脂的填充量，但能保持与电机转轴接触面的油脂量，润滑效果好。
所述的密封唇包括邻近电机转轴外端的外唇和邻近端盖的内唇，所述的外唇为矩形截面构造，所述的内唇的内端与端盖顶面共面。结构简化，便于制造。
所述的外唇与耐磨耐油橡胶密封圈的外端面之间设有环绕的沟槽，沟槽截面为底部小圆弧过渡的夹角槽，夹角的角度在60度到120度之间。沟槽一方面可以降低材料用量，另一方面可以使外唇的弹性处于较佳状态。
所述的外唇与电机转轴存在45度夹角，所述的内唇的外侧面与外唇的内侧面夹角为90度。该角度设置使密封唇结构优化效果更好。
所述的外唇和内唇的唇口均为圆弧角。圆弧角唇口与转轴的接触面少，耐磨效果好。
有益效果：可有效隔绝外部盐雾环境或油烟环境，防止端盖外表面出现腐蚀，防止水、油侵入轴承室而造成轴承生锈或轴承室积垢风险，免去了对端盖的喷塑或电泳的抗蚀处理，能够有效实现防轴承电腐蚀导线组件的焊接导通，确保电机寿命和可靠性；轴承油脂也可以减小密封唇与转轴表面的摩擦系数，大大减轻密封唇的唇口摩擦老化。
附图说明
图1是本发明的电机端向视图。
图2是本发明图1中A-A剖视示意图。
图3是本发明耐磨耐油橡胶密封圈结构示意图。
图4是本发明防轴承电腐蚀导线组件与端盖连接示意图。
图5是本发明图2中B部放大示意图。
图中：1-塑封定子外壳；2-端盖；3-电机转轴；4-防轴承电腐蚀导线组件；5-耐磨耐油橡胶密封圈；501-密封唇；502-沟槽；503-环绕油槽；504-唇口；50101-外唇；50102-内唇。
具体实施方式
以下结合说明书附图对本发明的技术方案做进一步的详细说明。
如图1-5所示，一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，包括塑封定子外壳1、设于塑封定子外壳1内的端盖2、从端盖2的中心孔伸出的电机转轴3，端盖2外焊接有防轴承电腐蚀导线组件4，塑封定子外壳1与端盖2之间设有耐磨耐油橡胶密封圈5，耐磨耐油橡胶密封圈5过盈外套于端盖2并完全覆盖端盖2外表面；耐磨耐油橡胶密封圈5中心孔设有2道周向的密封唇501，电机转轴3从端盖2的轴承室伸出，依次穿过端盖2中心孔和耐磨耐油橡胶密封圈5中心孔，并与密封唇501过盈配合；2道密封唇501与电机转轴3的外周面封闭成环绕油槽503，其间填满轴承油脂。
为了减少油脂的填充量，环绕油槽503的截面为底部带小圆弧过渡的夹角槽，夹角的角度为90度。可减少油脂的填充量，但能保持与电机转轴3接触面的油脂量，润滑效果好。
为了便于制造，密封唇501包括邻近电机转轴3外端的外唇50101和邻近端盖2的内唇50102，外唇50101为矩形截面构造，内唇50102的内端与端盖2顶面共面。结构简化，便于制造。
为了使外唇50101获得较好的结构优化效果，外唇50101与耐磨耐油橡胶密封圈5的外端面之间设有环绕的沟槽502，沟槽502截面为底部小圆弧过渡的夹角槽，夹角的角度为90度。沟槽502一方面可以降低材料用量，另一方面可以使外唇50101的弹性处于较佳状态。
为了实现更好地结构优化效果，外唇50101与电机转轴3存在45度夹角，内唇50102的外侧面与外唇50101的内侧面夹角为90度。该角度设置使密封唇501结构优化效果更好。
为了获得更好地耐磨效果，外唇50101和内唇50102的唇口504均为圆弧角。圆弧角唇口504与转轴的接触面少，耐磨效果更好。
装配时，将端盖2与防轴承电腐蚀导线组件4塑封在定子前端，与带有光滑电机转轴3和轴承的转子组装成电机，然后，在耐磨耐油橡胶密封圈5的环绕油槽503内先填入适量轴承油脂，再将耐磨耐油橡胶密封圈5套入电机转轴3，压入端盖2和定子塑封内径之间，形成塑封电机整机。
通过耐磨耐油橡胶密封圈5过盈覆盖外套于端盖2外表面，并通过多道密封唇501与电机转轴3过盈相配，在密封唇501间的环绕油槽503填满轴承油脂，可有效隔绝外部盐雾环境或油烟环境，防止端盖2外表面出现腐蚀，防止水、油侵入轴承室而造成轴承生锈或轴承室积垢风险，免去了对端盖2的喷塑或电泳的抗蚀处理，能够有效实现防轴承电腐蚀导线组件4的焊接导通，确保电机寿命和可靠性。
以上图1-5所示的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构是本发明的具体实施例，已经体现出本发明突出的实质性特点和显著进步，可根据实际的使用需要，在本发明的启示下，对其进行形状、结构等方面的等同修改，均在本方案的保护范围之列。

Claims (4)

  1. 一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，包括塑封定子外壳(1)、设于塑封定子外壳(1)内的端盖(2)、从端盖(2)的中心孔伸出的电机转轴(3)，所述的端盖(2)外焊接有防轴承电腐蚀导线组件(4)，其特征在于：所述的塑封定子外壳(1)与端盖(2)之间设有耐磨耐油橡胶密封圈(5)，所述的耐磨耐油橡胶密封圈(5)过盈外套于端盖(2)并完全覆盖端盖(2)外表面；耐磨耐油橡胶密封圈(5)中心孔设有多道周向的密封唇(501)，电机转轴(3)从端盖(2)的轴承室伸出，依次穿过端盖(2)中心孔和耐磨耐油橡胶密封圈(5)中心孔，并与密封唇(501)过盈配合；密封唇(501)与电机转轴(3)的外周面封闭成环绕油槽(503)，其间填满轴承油脂。2.根据权利要求1所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，
    其特征在于：所述的密封唇(501)共2道，其间为环绕油槽(503)。3.根据权利要求2所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，
    其特征在于：所述的环绕油槽(503)的截面为底部带小圆弧过渡的夹角槽，夹角的角度在60度到120度之间。
  2. 根据权利要求3所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，其特征在于：所述的密封唇(501)包括邻近电机转轴(3)外端的外唇(50101)和邻近端盖(2)的内唇(50102)，所述的外唇(50101)为矩形截面构造，所述的内唇(50102)的内端与端盖(2)顶面共面。
  3. 根据权利要求4所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，其特征在于：所述的外唇(50101)与耐磨耐油橡胶密封圈(5)的外端面之间设有环绕的沟槽(502)，沟槽(502)截面为底部小圆弧过渡的夹角槽，夹角的角度在60度到120度之间。6.根据权利要求5所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，
    其特征在于：所述的外唇(50101)与电机转轴(3)存在45度夹角，所述的内唇(50102)的外侧面与外唇(50101)的内侧面夹角为90度。
  4. 根据权利要求6所述的一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构，其特征在于：所述的外唇(50101)和内唇(50102)的唇口(504)均为圆弧角。
PCT/CN2019/113820 2019-05-13 2019-10-29 一种塑封无刷直流电机转轴处防水油及盐雾侵入密封结构 WO2020228250A1 (zh)

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