A sealing structure and a motor having the same

Abstract

The application provides a sealing structure and a motor with the same. The sealing structure comprises an end cover connected with a rotating shaft and a waterproof cover. The end cover has a sealing chamber, and an outer wall of the end cover is provided with an outer shielding part. A shaft extension protection cavity is formed between the end cover and the outer shielding part. The waterproof cover is arranged in the shaft extension protection cavity, and the waterproof cover shields the sealing chamber. The outer shielding part and the waterproof cover shield and protect the sealing chamber, so that the sealing chamber is prevented from directly contacting with an external space. When the motor is operated in a humid environment or an environment containing various corrosive gases, water is prevented from entering the inside of the motor along the sealing chamber.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a sealing structure and an electric machine with the same. BACKGROUND

[0002] The current motor waterproof structure used in the fan industry is to install a VD-shaped rubber sealing ring or an oil seal on the shaft extension end cover, so as to seal the motor. However, the motor used in the livestock breeding industry is operated in a humid environment containing various corrosive gases for a long time, and the farm may even regularly use a high-pressure water gun to flush the motor, so that the VD-shaped rubber sealing ring and the oil seal are prone to corrosion and aging. The aged VD-shaped rubber sealing ring and the oil seal have poor protection effect, and water seeps into the motor through the shaft extension part, thereby affecting the normal operation of the motor. Therefore, designing a high waterproof grade sealing structure is a key problem to improve the service life of the motor. SUMMARY

[0003] The application provides a sealing structure and an electric machine with the same, which can solve the technical problem of poor waterproof performance of the current motor used in the fan industry, which affects the normal operation of the motor.

[0004] The application provides a sealing structure, which comprises an end cover connected with a rotating shaft and a waterproof cover.

[0005] The end cover has a sealing chamber, and an outer wall of the end cover is provided with an outer shielding part, and an axis extension protection cavity is formed between the end cover and the outer shielding part. The two ends of the waterproof cover are located in the axis extension protection cavity, and the waterproof cover shields the sealing chamber.

[0006] In some embodiments, the outer shielding part comprises an extension ring and a shielding cover connected with each other, one end of the extension ring away from the shielding cover is connected with the end cover, and one end of the shielding cover away from the extension ring extends radially towards the rotating shaft.

[0007] In some embodiments, a plurality of drainage holes are formed in the extension ring, and the number of the drainage holes is at least 3. The diameter of the drainage hole is d, and 2mm < d < 4mm is satisfied.

[0008] In some embodiments, the waterproof cover comprises a water blocking cover and a waterproof table connected with the water blocking cover, the water blocking cover is arranged between the shielding cover and the sealing chamber, and a first layer of protection is formed between the water blocking cover and the shielding cover. The outer edge of the waterproof table extends towards the extension ring, and a second layer of protection is formed between the waterproof table and the extension ring.

[0009] In some embodiments, the waterproof table comprises a drainage ring and a water blocking ring connected with each other, the drainage ring has an inclined surface, and the water blocking ring is arranged in parallel with the shielding cover.

[0010] In some embodiments, an included angle a is formed between the drainage ring and the water blocking ring, and 100° < a < 135° is satisfied.

[0011] In some embodiments, the distance between the shielding cover and the water-blocking cover is L4, the distance between the water-proof platform and the extension ring is L3, the distance between the water-proof platform and the end surface of the end cover is L2, and the following conditions are satisfied: 1mm < L4 < 3mm, 1mm < L3 < 2mm, and 2.5mm < L2 < 3.5mm.

[0012] A motor comprising a rotating shaft and the sealing structure described above.

[0013] In some embodiments, the rotating shaft is provided with an annular groove for mounting the water-proof cover, and the water-proof cover is in interference fit with the annular groove.

[0014] In some embodiments, the distance between the annular groove and the end surface of the end cover is L1, and the depth of the annular groove is h, and the following conditions are satisfied: 2mm < L1 < 3mm, and 3mm < h < 5mm.

[0015] The sealing structure and the motor provided by the present application have the following advantages:

[0016] During rotation of the rotating shaft of the motor, the water-proof cover rotates with the shaft, and water flows into the shaft extension protection cavity, and the water-proof cover blocks the water outside the sealing chamber. The outer shielding part and the water-proof cover of the present application shield and protect the sealing chamber, avoiding direct contact between the sealing chamber and the external space. When the motor operates in a humid and corrosive gas-containing environment, water is prevented from entering the internal part of the motor along the sealing chamber, the motor is less prone to wear and corrosion, thereby avoiding reducing the service life of the motor. In addition, the shaft extension length of the rotating shaft of the motor is relatively short, and the water-proof cover is arranged in the shaft extension protection cavity, which not only makes full use of the shaft extension space but also blocks water from entering the sealing chamber, and the structure is compact. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other embodiments can be derived from the provided drawings without creative labor.

[0018] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the limiting conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0019] Figure 1 Fig. 1 is a schematic diagram of the motor of the present application;

[0020] Figure 2 Fig. 2 is a schematic diagram of the sealing structure of the present application;

[0021] Figure 3 Fig. 3 is a schematic diagram of the outer layer shielding part of the present application;

[0022] Figure 4 Fig. 4 is a schematic diagram of the path of the drainage mode of the present application;

[0023] Figure 5 Fig. 5 is a schematic diagram of the waterproof cover of the present application;

[0024] Figure 6 Fig. 6 is a schematic diagram of Figure 1 Fig. 7 is an enlarged view of A in Fig. 6;

[0025] Figure 7 Fig. 8 is a schematic diagram of the rotating shaft of the present application.

[0026] Fig. 1 is a schematic diagram of the motor of the present application; Fig. 2 is a schematic diagram of the sealing structure of the present application; Fig. 3 is a schematic diagram of the outer layer shielding part of the present application; Fig. 4 is a schematic diagram of the path of the drainage mode of the present application; Fig. 5 is a schematic diagram of the waterproof cover of the present application; Fig. 6 is a schematic diagram of Fig. 7 is an enlarged view of A in Fig. 6; Fig. 8 is a schematic diagram of the rotating shaft of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0029] It should be understood that the term "and / or" as used herein merely describes associated objects in an associated manner, and can represent three conditions, for example, A and / or B can represent three conditions of A alone, A and B, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0030] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the authorized description under appropriate circumstances. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship generally based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0032] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0033] In addition, it should be noted that the use of the terms "first", "second" and the like is merely intended to distinguish the corresponding components, and the above terms do not have special meanings unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0034] Referring to Figure 2 As shown in the drawings, according to the embodiment of the present application, a sealing structure is provided, which comprises an end cover 1 connected with a rotating shaft 401 and a waterproof cover 2, the end cover 1 has a sealing chamber, an outer wall of the end cover 1 is provided with an outer shielding part 3, and a shaft extension protection cavity is formed between the end cover 1 and the outer shielding part 3; both ends of the waterproof cover 2 are located in the shaft extension protection cavity, and the waterproof cover 2 shields the sealing chamber.

[0035] During the rotation of the rotating shaft 401 of the motor 5, the waterproof cover 2 rotates with the shaft, water flows into the shaft extension protection cavity, and the waterproof cover 2 blocks the water outside the sealing chamber. The outer shielding part 3 and the waterproof cover 2 of the present application shield and protect the sealing chamber, avoiding direct contact between the sealing chamber and the external space. When the motor 5 operates in a humid and corrosive gas-containing environment, the waterproof cover 2 prevents water from entering the interior of the motor 5 along the sealing chamber, so that the motor 5 is not prone to wear and corrosion, thereby avoiding reducing the service life of the motor 5. In addition, the shaft extension length of the rotating shaft 401 of the motor 5 is relatively short, and the waterproof cover 2 of the present application is arranged in the shaft extension protection cavity, which not only makes full use of the shaft extension space but also blocks water from entering the sealing chamber, and the structure is compact.

[0036] As a specific embodiment, a skeleton oil seal 6 is arranged in the sealing chamber of the present application. Specifically, the skeleton oil seal 6 is of TC type, and the TC type is an inner skeleton and outer rubber double-lip skeleton oil seal, wherein T represents double-lip, and C represents outer rubber coating. The double-lip skeleton oil seal main lip is used for oil prevention, and the auxiliary lip is used for dust prevention. The present application adopts the TC type skeleton oil seal 6, which has better sealing effect and corrosion resistance, and is more suitable for the use environment of the motor 5.

[0037] Referring to Figure 2 and Figure 3 As shown in the drawings, the outer shielding part 3 comprises an extension ring 301 and a shielding cover 302 connected with each other, the extension ring 301 and the shielding cover 302 are integrally formed, one end of the extension ring 301 away from the shielding cover 302 is connected with the end cover 1, and the extension ring 301 is arranged in parallel with the rotating shaft 401 of the motor 5. One end of the shielding cover 302 away from the extension ring 301 extends radially to the rotating shaft 401 of the motor 5, forming a first through hole for the rotating shaft 401 of the motor 5 to extend out.

[0038] A drain hole 311 is formed on the extension ring 301, the drain hole 311 communicates with the shaft extension protection cavity, and at least three drain holes 311 are provided; the diameter of the drain hole 311 is d, and satisfies: 2mm < d < 4mm.

[0039] In the embodiment, when d < 2 mm, the diameter of the drain hole 311 is too small, water is not easy to drain from the drain hole 311, and water will accumulate in the shaft extension protection cavity and slowly drain out, and the drainage effect of the drain hole 311 is not good; when d > 4 mm, the diameter of the drain hole 311 is too large, and dust and foreign matter and water are easy to enter the shaft extension protection cavity through the drain hole 311. Specifically, the drain hole 311 can be provided along the circumference of the extension ring 301 3 to 5, when the number of drain holes 311 is less than 3, water cannot flow out of the shaft extension protection cavity in time, the drainage path is less, and it will also lead to poor drainage effect; when the number of drain holes 311 is more than 5, it will increase the probability of water entering the drain hole 311, which will affect the protection effect.

[0040] The drain hole 311 is provided on the extension ring 301, when water enters the shaft extension protection cavity, the waterproof cover 2 rotates with the rotating shaft 401 of the motor 5, and the water can be drained in time through the drain hole 311, avoiding the water in the shaft extension protection cavity for a long time. Gather, slowly penetrate into the interior of the motor 5 through the oil seal, affect the normal operation and service life of the motor 5, effectively improve the waterproof and corrosion resistance of the motor 5.

[0041] For reference Figure 2 and Figure 5 As shown in the drawings, the waterproof cover 2 includes a water blocking cover 21 and a waterproof table 22 connected with the water blocking cover 21, the water blocking cover 21 is sleeved on the rotating shaft 401 of the motor 5, the water blocking cover 21 is arranged between the shielding cover 302 and the sealing chamber, the diameter of the water blocking cover 21 is greater than the diameter of the first through hole, so that part of the water blocking cover 21 is in communication with the external space, and a certain gap is left between the end face of the water blocking cover 21 and the shielding cover 302, forming a first layer of protection between the water blocking cover 21 and the shielding cover 302. The outer edge of the waterproof table 22 extends to the extension ring 301, and a certain gap is left between the waterproof table 22 and the extension ring 301, forming a second layer of protection between the waterproof table 22 and the extension ring 301.

[0042] The first layer of protection and the second layer of protection form a labyrinth type water blocking structure, the first layer of protection can block most of the water outside the end cover 1, and the second layer of protection can prevent a small amount of water from entering between the end cover 1 and the waterproof cover 2, thereby extending into the end cover 1 and flowing to the oil seal. Under the action of the two layers of protection, water is prevented from entering the sealing chamber, thereby avoiding corrosion and rust of the skeleton oil seal 6 by water.

[0043] The waterproof platform 22 comprises a water draining ring 221 and a water blocking ring 222 connected with each other, the water draining ring 221 is connected with the outer edge of the water blocking cover 21, the water blocking cover 21, the water draining ring 221 and the water blocking ring 222 are integrally formed, and the water draining ring 221 has a slope surface. The water blocking ring 222 is arranged in parallel with the shielding cover 302, the outer edge of the water blocking ring 222 extends to the extension ring 301, and a certain gap is left between the water blocking ring 222 and the extension ring 301.

[0044] The water draining ring 221 and the water blocking ring 222 have an included angle a, and 100°<a<135° is satisfied.

[0045] In the embodiment, when a<100°, water is easy to gather at the included angle between the water draining ring 221 and the water blocking ring 222, and water is not easy to flow out along the water blocking ring 222; the overall structure of the waterproof platform 22 is compact, when a>135°, the extension length of the water draining ring 221 is relatively long, and the length of the water blocking ring 222 is relatively short, which will affect the effect of the second layer of protection, and water is easy to flow into the sealing chamber.

[0046] In combination with Fig. 2, Figure 6 As shown in Fig. 2, the distance between the shielding cover 302 and the water blocking cover 21 is L4, the distance between the water blocking ring 222 and the extension ring 301 is L3, and the distance between the water blocking ring 222 and the end surface of the end cover 1 is L2, and 1mm<L4<3mm, 1mm<L3<2mm, and 2.5mm<L2<3.5mm are satisfied.

[0047] In the embodiment, when L4<1mm, the water blocking cover 21 is easy to rub against the shielding cover 302 in the process of following the rotation of the rotating shaft 401 of the motor 5 due to the too close distance between them; when L4>3mm, water is easy to flow into the shaft extension protection cavity from the distance between the water blocking cover 21 and the shielding cover 302, which will affect the waterproof effect. When L3<1mm, the distance between the water blocking ring 222 and the extension ring 301 is too close, and the water blocking ring 222 is easy to rub against the extension ring 301; when L3>2mm, water is easy to enter the sealing chamber from the distance between the water blocking ring 222 and the extension ring 301, which will affect the waterproof effect. When L2<2.5mm, the distance between the water blocking ring 222 and the end surface of the end cover 1 is too small, and friction is easy to occur; when L2>3.5mm, the distance between the water blocking ring 222 and the end surface of the end cover 1 is too large, which will affect the protection effect.

[0048] In combination with Fig. 2, Figure 4As shown, water flows into the shaft extension protection cavity from the water baffle cover 21 and the shielding cover 302 in the direction of the a arrow, and the water discharge process has two ways, one is to fall downward in the direction of the c arrow and discharge from the drain hole 311, and the other is to flow down along the drain ring 221 in the direction of the b arrow, and the water is thrown out when sliding to the middle of the slope surface of the drain ring 221 under the influence of gravity and the rotation of the motor 5, and finally discharged through the drain hole 311. Both of the two water discharge ways can realize the water discharge from the shaft extension protection cavity, and the water discharge way is flexible, which avoids the water accumulation in the shaft extension protection cavity for a long time.

[0049] For reference Figure 1 As shown, a motor 5 includes a rotating shaft 401 and the above-mentioned sealing structure.

[0050] As a specific embodiment, the motor 5 of the present application is a new type of high-efficiency EC motor, which is a permanent magnet motor and an intelligent integrated motor system integrated with a controller.

[0051] For reference Figure 7 As shown, the end cover 1 cooperates with the housing stop of the motor 5, the end cover 1 cooperates with the rotating shaft 401 in a gap, the rotating shaft 401 is provided with an annular groove 402 for installing the waterproof cover 2, and the waterproof cover 2 is in interference fit with the annular groove 402.

[0052] In the embodiment, the annular groove 402 can not only be used for positioning and installing the waterproof cover 2, but also form a height difference with the rotating shaft 401, so that the waterproof cover 2 and the annular groove 402 form a third layer of protection. Even if water seeps into the contact part of the water baffle cover 21 and the rotating shaft 401, the water cannot seep into the skeleton oil seal 6 due to the existence of the height difference, and cannot seep into the inside of the motor 5 from the contact part of the skeleton oil seal 6 and the rotating shaft 401, which improves the waterproof level of the motor 5. It can also prevent the skeleton oil seal 6 from being corroded and aged due to long-term exposure to a humid environment containing various corrosive gases, and losing its protection effect.

[0053] The distance between the annular groove 402 and the end face of the end cover 1 is L1, the depth of the annular groove 402 is h, and satisfies: 2mm

[0054] In the embodiment, when L1<2mm, the distance between the annular groove 402 and the end face of the end cover 1 is too small, which is easy to cause friction; when L1>3mm, the distance between the annular groove 402 and the end face of the end cover 1 is too large, which affects the protection effect. When h<3mm, the depth of the annular groove 402 is too shallow, in order to prevent the waterproof cover 2 and the rotating shaft 401 from being separated, the cooperation between the water baffle cover 21 and the annular groove 402 is too tight, which will cause permanent deformation of the waterproof cover 2 and affect the protection effect; when h>5mm, the depth of the annular groove 402 is too deep, which will affect the structural strength of the rotating shaft 401.

[0055] Further, the width of the annular groove 402 is B1, the width of the water baffle 21 is B2, the shaft diameter of the waterproof cover 2 is d3, the groove bottom shaft diameter of the annular groove 402 is d2, and the following conditions are met: B1=B2, 0.85d2

[0056] In the present embodiment, when B1=B2, the waterproof cover 2 can be well limited, and the waterproof cover 2 can be prevented from moving axially. When the shaft diameter d3 of the waterproof cover 2 is set to be 85%-90% of the groove bottom shaft diameter of the annular groove 402, the waterproof cover 2 and the annular groove 402 form an interference fit, and the fit is tight.

[0057] It is easy for those skilled in the art to understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0058] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be considered as the protection scope of the present application.

Claims

1. A seal structure, characterized by, The utility model relates to a sealing structure of a rotating shaft, which comprises: an end cover (1) and a waterproof cover (2) connected with the rotating shaft (401); the end cover (1) has a sealed chamber, and an outer wall of the end cover (1) is provided with an outer layer shielding part (3), and an axial extension protection cavity is formed between the end cover (1) and the outer layer shielding part (3); both ends of the waterproof cover (2) are located in the axial extension protection cavity, and the waterproof cover (2) shields the sealed chamber; the outer layer shielding part (3) comprises an extension ring (301) and a shielding cover (302) connected with each other, one end of the extension ring (301) away from the shielding cover (302) is connected with the end cover (1), and one end of the shielding cover (302) away from the extension ring (301) extends radially towards the rotating shaft (401); a drain hole (311) is formed in the extension ring (301); the waterproof cover (2) comprises a water blocking cover (21) and a waterproof platform (22) connected with the water blocking cover (21), the water blocking cover (21) is arranged between the shielding cover (302) and the sealed chamber, and a first layer of protection is formed between the water blocking cover (21) and the shielding cover (302); an outer edge of the waterproof platform (22) extends towards the extension ring (301), and a second layer of protection is formed between the waterproof platform (22) and the extension ring (301); the waterproof platform (22) comprises a water draining ring (221) and a water blocking ring (222) connected with each other, the water draining ring (221) has an inclined surface, and the water blocking ring (222) is arranged in parallel with the shielding cover (302).

2. The seal structure of claim 1, wherein The drain hole (311) is provided with at least three drain holes; the diameter of the drain hole (311) is d, and the following condition is met: 2mm < d < 4mm.

3. The seal structure of claim 1, wherein An included angle alpha is formed between the water draining ring (221) and the water blocking ring (222), and the following condition is met: 100° < alpha < 135°.

4. The seal structure of claim 1, wherein The distance between the shielding cover (302) and the water blocking cover (21) is L4, the distance between the waterproof platform (22) and the extension ring (301) is L3, and the distance between the waterproof platform (22) and the end face of the end cover (1) is L2, and the following conditions are met: 1mm < L4 < 3mm, 1mm < L3 < 2mm, and 2.5mm < L2 < 3.5mm.

5. An electric machine characterized by The utility model relates to a sealing structure of a rotating shaft, which comprises: a rotating shaft (401) and the sealing structure according to any one of claims 1 to 4.

6. The electric machine of claim 5, wherein, An annular groove (402) for mounting the waterproof cover (2) is formed in the rotating shaft (401), and the waterproof cover (2) is in interference fit with the annular groove (402).

7. The electric machine of claim 6, wherein, The distance between the annular groove (402) and the end face of the end cover (1) is L1, and the depth of the annular groove (402) is h, and the following conditions are met: 2mm < L1 < 3mm, and 3mm < h < 5mm.

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