A set of watertight rings, a watertight sealing device, and an external rotor device

Abstract

The present invention discloses a set of watertight rings, a watertight sealing device, and an external rotor apparatus. The external rotor apparatus comprises an apparatus body and an electric motor having a drive shaft. The set of watertight rings is fitted onto the drive shaft and connected to the apparatus body, and comprises a first watertight ring and a second watertight ring, forming a container for securing a watertight seal. The container has an internal lateral opening facing the center of the set of watertight rings, to allow an internal radial end of the watertight seal to extend outward. The watertight seal is disposed between the first watertight ring and the second watertight ring. (See Figure 3 for abbreviations.)

Description

Title of the invention: A set of watertight rings, a watertight sealing device, and an external rotor device. Technical field

[0001] The present invention relates to the technical field of external rotor devices, and specifically to a set of watertight rings, a watertight sealing device and an external rotor device. Description of related art

[0002] In external rotor devices such as trenchers, in order for the rotor to be connected to the motor's drive shaft, a gap must be present between the drive shaft and the device body; therefore, it is necessary to create a seal between the two. Previous sealed structures generally use a rubber watertight seal. The method of arranging the rubber watertight seal generally consists of placing the rubber watertight seal in the through hole of the device body, with the drive shaft passing through the rubber watertight seal.

[0003] With the aforementioned arrangement of the rubber water seal, the latter pivots along the transmission shaft, so when the friction surface of the rubber water seal with the body of the device is too large, the rubber water seal wears out too quickly, in addition it is easily liable to slip from its initial position during the rotation process of the slicer, which affects its sealing properties.

[0004] Therefore, a set of watertight rings, a watertight sealing device and an external rotor device are necessary in order to at least partially solve the aforementioned problem. BRIEF DESCRIPTION OF THE INVENTION

[0005] In the Content of the Invention section, a series of concepts are mentioned in simplified form; these will be described in more detail in the Embodiment section. The Content of the Invention section does not imply any limitation on the essential and necessary technical features of the technical design for which protection is claimed, nor does it constitute an attempt to determine the scope of protection of the technical design for which protection is claimed.

[0006] In order to at least partially solve the aforementioned problem, the present invention provides a set of watertight rings, intended to secure the watertight seal, said watertight seal being used on the external rotor device, said external rotor comprising the body of the device and the motor with the shaft of transmission, said motor being arranged inside said body of the apparatus, said transmission shaft passing through said body of the apparatus and being able to pivot, said set of watertight rings being fitted onto said transmission shaft and connecting to the body of the apparatus, said set of watertight rings comprises: - a first waterproof ring; and - a second watertight ring, said second watertight ring is located on the axial side of said first watertight ring running along said set of watertight rings, said first watertight ring and said second watertight ring forming a container part used to fix said watertight seal, said container part being used on the internal lateral opening of said watertight seal protruding in the radial direction, said internal lateral opening facing the center of said set of watertight rings.

[0007] Optionally, said containing part includes a limiting wall surface, a first limiting edge and a second limiting edge, said limiting wall surface being used to abut against the most peripheral surface of said watertight seal in the radial direction, said first limiting edge is arranged at intervals with said second limiting edge in the axial direction of said assembly of watertight rings, in order to facilitate the tightening of said watertight seal between said first limiting edge and said second limiting edge.

[0008] Optionally, at least one of said first watertight ring and said second watertight ring is provided with said limiting wall surface, said limiting wall surface extends in said axial direction and faces the center of said set of watertight rings, said first watertight ring is provided with said first limiting rim, said second watertight ring is provided with said second limiting rim.

[0009] Optionally, at least one of said first watertight ring and said second watertight ring is provided at intervals with a threaded hole for connecting said body of the device.

[0010] Optionally, said first watertight ring is arranged on the side of said body of the distal device of said second watertight ring, said first watertight ring is provided at intervals with at least two threaded columns having threaded holes, said second watertight ring is provided at intervals with at least two limiting openings, said threaded columns are arranged in said limiting openings, furthermore the peripheral surface of said threaded columns comes into contact with the wall surface of said limiting openings.

[0011] Optionally, said limiting openings are recesses or openings with a closed circumference.

[0012] Optionally, said first watertight ring is provided at intervals with a limiting wall, said limiting wall extends on the side where said second watertight ring is located, said limiting wall is located between said adjacent threaded columns, said second watertight ring is located on the inner side of said limiting wall proximal to the center of said set of watertight rings and abuts against said limiting wall.

[0013] Optionally, one of said first watertight ring and said second watertight ring is provided with a positioning part, the other of said first watertight ring and said second watertight ring is provided with a positioning opening, said positioning part is located inside said positioning opening.

[0014] Optionally, the external peripheral shape of said first watertight ring is circular or oval; or the surface of the external periphery of said first watertight ring comprises at least one arc-shaped surface and at least one flat surface, said arc-shaped surface being connected to said flat surface or being connected to another said arc-shaped surface; or the external peripheral shape of said first watertight ring being polygonal.

[0015] In another area, the present invention provides a watertight sealing device used on an external rotor device, the watertight sealing device comprises a watertight seal and said set of watertight rings of any of the aforementioned areas, said watertight seal is arranged between said first watertight ring and said second watertight ring and is located in said containing part, furthermore the radial inner end of said watertight seal protrudes from the internal lateral opening of said containing part.

[0016] Optionally, said watertight seal is an elastically deformable component.

[0017] In another field, the present invention provides an external rotor device comprising a body of the device, a motor equipped with a drive shaft and said watertight sealing device of any of the aforementioned fields, said motor is arranged in the internal part of said body of the device, said drive shaft passes through said body of the device and can pivot, said watertight sealing device is fitted onto said drive shaft and is connected to said body of the device, said watertight seal abuts against the peripheral surface of said drive shaft.

[0018] According to the present invention, the arrangement of the watertight seal between said first watertight ring and said second watertight ring allows By securely and reliably installing the water seal on the device body, it is prevented from pivoting with the rotation of the drive shaft. This prevents the water seal from shifting, tilting, or moving, at least axially, and from leaving its installed position during the drive shaft transmission process, thus preventing the water seal from losing its sealing capacity. The water seal and the drive shaft can be arranged to minimize friction, preventing accelerated wear of the water seal due to excessive friction with the drive shaft, thereby extending the service life of the water seal. Furthermore, the relatively low heat generated by friction further prolongs the service life of the water seal.

[0019] The watertight structure provided by the present invention makes it possible to effectively seal the gap between the transmission shaft and the body of the device, blocks the penetration of fluids through the gap into the internal part of the body of the device, the watertight seal can reliably maintain its installed position, which further increases its sealing properties, in addition its overall resistance to wear is good, the service life of the watertight seal is longer, thus the frequency of replacement of the watertight seal is reduced, and the maintenance costs of the device are reduced.

[0020] BRIEF DESCRIPTION OF THE DIFFERENT VIEWS OF THE DRAWINGS

[0021] The accompanying figures below, as part of the present invention, are intended to explain the present invention. The figures represent embodiments and descriptions of the present invention and are intended to explain the principles of the present invention.

[0022] In the Figures:

[0023] [Fig.1] represents a three-dimensional view of the watertight sealing device according to the present invention;

[0024] [Fig.2] represents another three-dimensional view of the watertight sealing device shown in [Fig.1];

[0025] [Fig.3] represents a cross-sectional view of the line AA of [Fig.1];

[0026] [Fig.4] represents a cross-sectional view similar to [Fig.3], in which the waterproof seal has been removed;

[0027] [Fig.5] represents an exploded view of the cross-section of the watertight sealing device shown in [Fig.1];

[0028] [Fig.6] represents a three-dimensional exploded view of the watertight sealing device shown in [Fig.1];

[0029] [Fig.7] represents another three-dimensional exploded view of the watertight sealing device shown in [Fig.1];

[0030] Description of the reference numbers of the accompanying figures:

[0031] 10 Watertight sealing device

[0032] 100 Set of waterproof rings

[0033] 110 First waterproof ring

[0034] 111 First limiting wall surface

[0035] 112 First limiting boundary

[0036] 113 Threaded hole

[0037] 114 Threaded column

[0038] 115 Limiting wall

[0039] 116 Internal peripheral wall

[0040] 117 Connecting wall

[0041] 118 External peripheral wall

[0042] 120 Second water-resistant ring

[0043] 121 Second limiting wall surface

[0044] 122 Second limiting boundary

[0045] 123 Limiting opening

[0046] 124th Floor

[0047] 130 Containing part

[0048] 131 Internal side opening

[0049] 141 Positioning part

[0050] 142 Positioning opening

[0051] 20 Watertight seal DETAILED DESCRIPTION OF THE INVENTION

[0052] In the description below, numerous concrete details are given to provide a full understanding of the present invention. However, it is obvious to those skilled in the art that the present invention does not require one or more of these details to be implemented. In other examples, to avoid any ambiguity with the present invention, no description is given of certain technical features known in this field.

[0053] In order to fully understand the present invention, a detailed description is given in the descriptions below. Of course, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Relatively optimal embodiments are described below; however, the present invention has other embodiments besides those detailed in these descriptions.

[0054] It should be noted that the terminology used here is intended solely to describe embodiments, and not to limit the embodiments illustrating the present invention. Furthermore, it should be understood that when the terms "contains / "containing" and / or "includes / comprising" are used in this description, this indicates the presence of said characteristic, globality, step, operation, element and / or set, without excluding the presence or addition of one or more other characteristics, globalities, steps, operations, elements and / or sets and / or their combination.

[0055] The terms used in the present invention, such as "first" and "second," are given solely by way of example; they do not have any other meaning, such as a specific order. Furthermore, for example, the term "first element" does not suggest the existence of a "second element," and the term "second element" does not suggest the existence of a "first element."

[0056] It should be explained that the use in this text of the terms "above / superior", "below / inferior", "front / anterior", "back / posterior", "right", "left", "inside / internal / interior", "external / exterior" and other similar expressions are given for explanatory purposes and do not constitute a limitation.

[0057] A detailed description of exemplary embodiments illustrating the present invention and with reference to the accompanying figures is now given. However, these embodiments can be carried out in various forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that the provision of these embodiments is intended to make the present invention fully and completely public and to fully convey the design of these exemplary embodiments to those skilled in the art.

[0058] The present invention provides a watertight sealing device, the watertight sealing device being usable on an external rotor device. Specifically, the external rotor may comprise a body of the device, a motor having a drive shaft, and a rotor. The motor is arranged in the internal part of the body of the device. The drive shaft may pass through the body of the device and pivot; specifically, the drive shaft pivots about its central axial line relative to the body of the device. The rotor may be connected to the drive shaft so as to pivot along the drive shaft. The watertight sealing device may be fitted onto the drive shaft and connected to the body of the device in order to seal the gap between the drive shaft and the body of the device. The external rotor device may be an appliance such as a slicer, a blender, or a fan.

[0059] In combination with Figures 1 to 7, the watertight sealing device 10 is described below.

[0060] As shown in Figures 1 to 3, the watertight sealing device 10 comprises a watertight seal 20 and a set of watertight rings 100 used to secure the watertight seal 20. The watertight ring assembly 100 can be fitted onto the drive shaft and connected to the device body. The watertight seal 20 is arranged within the watertight ring assembly 100. The watertight seal 20 is a component with elastic deformation. Optionally, the watertight seal 20 can be made of any material with elastic deformation, such as rubber. Specifically, the set of watertight rings 100 may also include a first watertight ring 110 and a second watertight ring 120. The second watertight ring 120 is located on one side of the axial direction of the first watertight ring 110 along said set of watertight rings 100. In addition, the first watertight ring 110 may be arranged on the side of the distal body of the device of the second watertight ring 120.In the embodiments shown in the Figures, the watertight sealing device 10 faces the installation surface of the device body downwards, the first watertight ring 110 is located above the second watertight ring 120. The first watertight ring 110 and the second watertight ring 120 are both made of a rigid element having adequate hardness, the first watertight ring 110 and the second watertight ring 120 can be made of any material having adequate rigidity, such as metal, plastic or rubber.

[0061] It should be explained that the terminology used to describe the orientation of each element, each part of the watertight sealing device 10, such as "on / upper", "under / lower", "above", "below", "upwards", "downwards", "face up" and "face down" relates to the horizontal placement and installation of the watertight sealing device 10 face down (see the placement shown in [Fig. 1]).

[0062] It must be understood that the axial direction of the water-sealing ring assembly 100 is parallel to the axial direction of the transmission shaft and the water-sealing seal 20, and the radial direction of the water-sealing ring assembly 100 is parallel to the radial direction of the transmission shaft and the water-sealing seal 20. Furthermore, the centerline of the axial direction of the water-sealing ring assembly 100 is shared with the centerline of the axial direction of the transmission shaft and the centerline of the axial direction of the water-sealing seal 20.

[0063] In the Figures, for the sake of simplicity, the axial direction of the assembly of water-sealing rings 100 and the axial direction of the water-sealing gasket 20 are noted D1, similarly, the radial direction of the assembly of water-sealing rings 100 and the radial direction of the water-sealing gasket 20 are noted D2, the periphery of the assembly of water-sealing rings 100 and the periphery of the water-sealing gasket 20 are noted D3.

[0064] As shown in [Fig.4], the first watertight ring 110 and the second watertight ring 120 form the containing part 130 used to fix the watertight seal 20. The watertight seal 20 is arranged between the first watertight ring 110 and the second watertight ring 120 and is located in the containing part 130.

[0065] The container portion 130 is provided with an internal lateral opening 131 used on and extending from the water seal 20. The internal lateral opening 131 faces the center of the water seal assembly 100. The water seal 20 can protrude from the internal lateral opening 131 of the container portion 130 (see [Fig. 3]), so that the water seal 20 can abut against the peripheral surface of the transmission shaft. In other words, the radial outer end D2 of the water seal 20 is located within the container portion 130, and its radial outer end D2 protrudes from the internal lateral opening 131 of the container portion 130.

[0066] In this embodiment, the arrangement of the watertight seal 20 between the first watertight ring 110 and the second watertight ring 120 allows the watertight seal 20 to be firmly fixed and securely installed on the body of the device, so that it cannot easily rotate with the rotation of the drive shaft. Thus, preventing the displacement, tilting, and movement of the watertight seal 20 in at least the radial direction DI prevents it from leaving its installed position during the transmission process via the drive shaft and thus prevents the watertight seal from losing its sealing capabilities.The water seal 20 and the drive shaft can be arranged so that the friction force is reduced to a minimum, preventing accelerated wear of the water seal 20 due to excessive friction with the drive shaft, thus extending the service life of the water seal; in addition, the heat generated by friction being relatively low, the service life of the water seal 20 is extended.

[0067] The present embodiment provides a watertight structure, making it possible to effectively seal the gap between the transmission shaft and the body of the device, blocking the penetration of fluids through the gap into the internal part of the body of the device. The watertight seal 20 can reliably maintain its installed position, which further increases its sealing properties. In addition, its overall wear resistance is good, the service life of the watertight seal 20 is longer, thus reducing the frequency of replacement of the watertight seal 20 and lowering the maintenance costs of the device.

[0068] It should be specified that, in the absence of other limitations, in the directional terminology used here, such as "facing inwards", "facing outwards", "inwards", "outwards", "inner lateral", "outer side", "inner / "interior" refers to proximity to the center of the watertight sealing device 10 and "exterior / outside" refers to distance from the center of the watertight sealing device 10.

[0069] The containing portion 130 may include a limiting wall surface, a first limiting edge 112, and a second limiting edge 122. The limiting wall surface may abut against the outermost surface of the watertight seal 20 in the radial direction, in order to limit the watertight seal 20 to its position perpendicular to the axial direction Dl, and to prevent it from moving or oscillating perpendicular to the axial direction DL. The first limiting edge 112 is arranged at intervals with the second limiting edge 122 in the axial direction Dl of the assembly of watertight rings 100, in order to facilitate the tightening of the watertight seal 20 between the first limiting edge 112 and the second limiting edge 122, and thus limits the position of the watertight seal 20 in the axial direction Dl, preventing it from moving or oscillating in the axial direction DL.

[0070] At least one of the first watertight ring 110 and the second watertight ring 120 is provided with the limiting wall surface. The limiting wall surface extends in the axial direction D1 and faces the center of the assembly of watertight rings 100. The limiting wall surface may be an annular wall surface extending in the peripheral direction D3; more specifically, it may be, for example, a circular annular wall extending in the peripheral direction D3. As shown in [Fig. 5], with regard to the embodiment shown in the Figure, the first watertight ring 110 is provided with the first limiting wall surface 111 and the first limiting rim 112. The first limiting rim 112 is located on the inner side of the first limiting wall surface 111 and is connected to the first limiting wall surface 111.The second watertight ring 120 is provided with the second limiting wall surface 121 and the second limiting rim 122, the second limiting rim 122 is located on the inner side of the second limiting wall surface 121 and is connected to the second limiting wall surface 121.

[0071] In another embodiment not shown, the first watertight ring 110 may be provided with the first limiting wall surface 111 and the first limiting edge 112. The first limiting wall surface 111 may extend to the second limiting edge 122 or close to the second limiting edge 122. Alternatively, the first watertight ring 110 may be provided with the first limiting edge 112, and the second watertight ring 120 may be provided with the second limiting edge 122. The limiting wall surface may extend to the first limiting edge 112 or close to the second limiting edge 122.

[0072] The first watertight ring 110 and the second watertight ring 120 can both be annular elements closed in the peripheral direction D3.

[0073] As shown in [Fig. 6], the central hole of the first watertight ring 110 is circular, with an internal diameter d1. The central hole of the second watertight ring 120 is circular, with an internal diameter d2. The watertight seal is circular, with an external diameter d31 and an internal diameter d32. The figure schematically represents the approximate positions of d1, d2, d31, and d32. The internal diameter d1 of the first watertight ring 110 may be smaller than the external diameter d31 of the watertight seal 20 and larger than the internal diameter d32 of the watertight seal 20. The internal diameter d2 of the second watertight ring 120 may be smaller than the external diameter d31 of the watertight seal 20 and larger than the internal diameter d32 of the watertight seal 20.

[0074] The external peripheral shape of the first watertight ring 110 is not limited; more specifically, with reference to [Fig. 7], the first watertight ring 110 has the external peripheral surface Fl. The projected shape of the external peripheral surface Fl onto the surface perpendicular to the axial direction Dl is not limited; it can be designed according to the requirements of the actual environment. For example, it can be designed according to the shape of the device body. The figure schematically represents the extension of the external peripheral surface Fl of the first watertight ring 110 along the axial direction DL.

[0075] In one example, the external peripheral shape of the first watertight ring 110 is circular or oval. Specifically, the first watertight ring 110 has a circular or oval external peripheral surface.

[0076] In another example, the external peripheral shape of the first watertight ring 110 is different. Specifically, the external peripheral surface Fl of the first watertight ring 110 may comprise at least one arc-shaped surface Fl 1 and at least one flat surface F12. The arc-shaped surface Fl 1 may be connected to the flat surface F12 or to another arc-shaped surface. For example, in one embodiment, the external peripheral surface Fl may comprise an arc-shaped surface Fl 1 and a flat surface F12. The two ends of this arc-shaped surface Fl 1 are connected to the flat surface F12. In this embodiment, optionally, the angle of the circular center of the arc-shaped surface Fl 1 is preferably greater than or equal to 180°. In another embodiment, the external peripheral surface Fl may comprise an arc-shaped surface Fl 1 and at least one flat surface F12.The two ends of this arc-shaped surface Fl 1 are respectively connected to different flat surfaces F12. In yet another embodiment, the peripheral surface. The external Fl can comprise two arc-shaped surfaces Fl 1 and at least two flat surfaces F12. The two ends of the arc-shaped surface Fl 1 are respectively connected to different flat surfaces F12. The figure of the embodiment represents two flat surfaces, these two flat surfaces being separated by the gap of an arc-shaped surface Fl 1; furthermore, they can be oriented in opposite directions and be mutually symmetrical.

[0077] In yet another example, the external peripheral shape of the first watertight ring 110 is polygonal. Specifically, the external peripheral surface Fl can comprise at least three flat surfaces F12. These at least three flat surfaces F12 are connected successively. Thus, the external peripheral shape of the first watertight ring 110 can be any polygon in the form of a triangle, rectangle, or staircase.

[0078] The set of watertight rings 100 can be connected to the device body by any suitable method, such as clamping with a clamping element, snap-fitting, or welding. For example, the set of watertight rings 100 can be removably connected to the device body by clamping with a clamping element. Specifically, at least one of the first watertight ring 110 and the second watertight ring 120 can be provided with threaded holes 113 at intervals for connection to the device body. The threaded holes 113 are arranged at intervals along the axial direction D3. The clamping elements pass through the threaded holes 113 to be fixed to the device body. The clamping elements can be screws.

[0079] As shown in [Fig. 6] and [Fig. 7], the first watertight ring 110 is provided at intervals with threaded columns 114 having threaded holes 113. The second watertight ring 120 is provided at intervals with limiting openings 123. The limiting openings 123 correspond to the positions of the threaded columns 114. There are at least two threaded columns 114; correspondingly, there are at least two limiting openings 123. The figure schematically represents three threaded holes 113 and three limiting openings 123. With reference to [Fig. 2], the threaded columns 114 can be located in the limiting openings 123; furthermore, the axial surfaces of the threaded columns 114 abut against the wall surfaces of the limiting openings 123.In this embodiment, the clamping elements pass through the threaded holes 113 of the threaded columns 114 to connect the first watertight ring 110 to the body of the device; the second watertight ring 120 is clamped between the first watertight ring 110 and the body of the device. Thanks to the arrangement of limiting openings 123, it is possible to prevent the second watertight ring 120 from moving relative to the first watertight ring 110, specifically. This refers to the displacement relative to the first watertight ring 110 in at least the direction perpendicular to the axial direction Dl, as well as the rotation relative to the first watertight ring 110.

[0080] In the Figure, the limiting openings 123 are recesses. That is to say, the limiting openings 123 are not closed along their periphery D3; there are openings. More specifically, the limiting openings 123 are semi-circular recesses. The arrangement of recesses makes it possible to reduce the radial dimensions D2 of the limiting openings 123, which reduces material costs. If necessary, the limiting openings 123 can be closed circumference openings, such as circular openings.

[0081] The first watertight ring 110 may be provided at intervals with a limiting wall 115. The limiting wall 115 may extend on the side where the second watertight ring 120 is located, such that the limiting wall 115 protrudes from the lower surface of the first watertight ring 110. The limiting wall 115 is situated between adjacent threaded columns 114. The second watertight ring 120 is located on the inner side of the proximal limiting wall of the center of the assembly of watertight rings 100 and abuts against the limiting wall 115.Thus, it is possible to further prevent the movement of the second watertight ring 120 relative to the first watertight ring 110; this specifically refers to the movement relative to the first watertight ring 110 in the direction perpendicular to the axial direction DL. The limiting wall 115 is an arc shape extending along the axial direction D3, and which can be connected to the threaded columns 114.

[0082] One of the first watertight ring 110 and the second watertight ring 120 is provided with a positioning portion 141 ([Fig. 7]), the other of the first watertight ring 110 and the second watertight ring 120 is provided with a positioning opening 142 ([Fig. 6]), the positioning portion 141 may be located inside the positioning opening 142. In the embodiment of the Figure, the first watertight ring 110 is provided with a positioning portion 141, the second watertight ring 120 is provided with a positioning opening 142. The dimensions of the positioning opening 142 are generally smaller than those of the limiting openings 123. Thanks to the arrangement of the positioning portion 141 and the positioning opening 142, It is possible to achieve a rapid assembly, which increases the efficiency rate of the assembly.During assembly, the positioning part 141 is aligned with the positioning opening 142, then the first watertight ring 110 and the second watertight ring 120 are placed side by side, during placement, the positioning part 141 is located in the positioning opening 142, the threaded columns 114 are positioned in the limiting openings 123. This is. benefits more the embodiment in which the peripheral shape of the first watertight ring 110 is not circular.

[0083] The first watertight ring 110 can further be provided with a support wall and an external peripheral wall 118. The support wall and the external peripheral wall 118 can extend facing the side where the second watertight ring 120 is located, so that the support wall and the external peripheral wall 118 protrude from the lower surface of the first watertight ring 110. The support wall is located on the inner side of the limiting wall 115 proximal to the center of the assembly of watertight rings 100, and the limiting wall 115 protrudes from the support wall. The support wall can abut against the second watertight ring 120. As an example, the support wall can include an internal peripheral wall 116 and a connecting wall 117. The internal peripheral wall 116 is of circular annular shape and is located on the external side of the first limiting edge 112.The internal peripheral wall 116 can abut against the watertight seal 20. Specifically, the surface of the internal peripheral wall 116 facing the center of the first watertight ring 110 constitutes the first limiting wall surface 111; it can abut against the watertight seal 20. The internal peripheral wall 116 is connected to the limiting wall 115 via the connecting wall 117. The connecting wall 117 extends in the radial direction D2 and is arranged at intervals in the axial direction D3. The external peripheral wall 118 is located on the external side of the threaded columns 114 proximal to the center of the assembly of watertight rings 100. The external peripheral wall 118 can be connected to the threaded columns 114. The positioning part 141 can be arranged to the connecting wall 117, specifically, on the surface of the connecting wall 117 facing the second watertight ring 120.

[0084] The support wall arrangement makes it possible to reinforce the structural hardness of the first watertight ring 110. The arrangement of the external peripheral wall 118 makes it possible to cover the structure of the internal part of the watertight sealing device 10, to prevent fluids from penetrating the internal part of the watertight sealing device 10, and thus penetrating the internal part of the body of the device, in addition it makes it possible to simplify and beautify the structure of the external part of the watertight sealing device 10.

[0085] The second watertight ring 120 may be provided with a stage 124 surrounding its central hole. The stage 124 is distal to the lateral depression where the first watertight ring 110 is located. The surface of the stage 124 extending in the axial direction DI constitutes the second limiting wall surface 121.

[0086] Except where defined, the technical and scientific terms used herein have the same meaning as that understood by a person skilled in the art in the field technique of the present invention. The terminology is used here solely for the purpose of concrete description and does not constitute a limitation of the present invention. The features described in one embodiment may be combined with other features to be applied to another embodiment of this text, except where said features are not applicable or are described differently in said other embodiments.

[0087] The present invention has been described using the aforementioned embodiments, but it should be understood that the aforementioned embodiments are used solely by way of example and description and should not be considered as limiting the scope of the present invention to the embodiments described. Furthermore, those skilled in the art should understand that the present invention is not limited to the aforementioned embodiments; numerous variations and modifications can be made based on the teachings provided by the present invention, and all such variations and modifications are covered by the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the accompanying claims and their equivalent scopes.

Claims

Demands

1. A set of watertight rings (100), intended to fix the watertight seal (20), said watertight seal (20) being used on the external rotor apparatus, said external rotor comprising the body of the apparatus and the motor with the drive shaft, said motor being arranged inside said body of the apparatus, said drive shaft passing through said body of the apparatus and being able to pivot, said set of watertight rings (100) being fitted onto said drive shaft and connecting to the body of the apparatus, said set of watertight rings (100) comprises: a first watertight ring (110);and a second watertight ring (120), said second watertight ring (120) is located on the axial side of said first watertight ring (110) running along said assembly of watertight rings (100), said first watertight ring (110) and said second watertight ring (120) forming a containing part (130) for fixing said watertight seal (20), said containing part (130) being used on the internal lateral opening (131) of said watertight seal (20) projecting in the radial direction, said internal lateral opening (131) facing the center of said assembly of watertight rings (100).;

2. A set of watertight rings (100) according to claim 1, characterized in that said containing part (130) comprises a limiting wall surface (111, 121), a first limiting edge (112) and a second limiting edge (122), said limiting wall surface (111, 121) being used to abut against the most peripheral surface of said watertight seal (20) in the radial direction, said first limiting edge (112) is arranged at intervals with said second limiting edge (122) in the axial direction of said set of watertight rings (100), in order to facilitate the tightening of said watertight seal (20) between said first limiting edge (112) and said second limiting edge (122).

3. A set of watertight rings (100) according to claim 2, characterized in that at least one of said first watertight ring (110) and said second watertight ring (120) is provided with said limiting wall surface (111, 121), said limiting wall surface (111, 121) extends in said axial direction and faces the center of said set of watertight rings (100), said first watertight ring (110) is provided with said first limiting rim (112), said second watertight ring (120) is provided with said second limiting rim (122).

4. A set of watertight rings (100) according to any one of claims 1 to 3, characterized in that at least one of said first watertight ring (110) and said second watertight ring (120) is provided at intervals with a threaded hole (113) for connecting said body of the device.

5. A set of watertight rings (100) according to claim 4, characterized in that said first watertight ring (110) is arranged on the side of said body of the distal device of said second watertight ring (120), said first watertight ring (110) is provided at intervals with at least two threaded columns (114) having threaded holes (113), said second watertight ring (120) is provided at intervals with at least two limiting openings, said threaded columns (114) are arranged in said limiting openings, furthermore the peripheral surface of said threaded columns (114) abuts the wall surface of said limiting openings.

6. A set of watertight rings (100) according to claim 5, characterized in that said limiting openings are recesses or openings with a closed circumference.

7. A set of watertight rings (100) according to claim 6, characterized in that said first watertight ring (110) is provided at intervals with a limiting wall (115), said limiting wall (115) extends on the side where said second watertight ring (120) is located, said limiting wall (115) is located between said adjacent threaded columns (114), said second watertight ring (120) is located on the inner side of said limiting wall (115) proximal to the center of said set of watertight rings (100) and abuts against said limiting wall (115).

8. A set of watertight rings (100) according to any one of claims 1 to 3, characterized in that one of said first watertight ring (110) and said second watertight ring (120) is provided with a positioning part (141), the other of said first watertight ring (110) and said second watertight ring (120) is provided with a positioning opening (142), said positioning part (141) is located inside said positioning opening (142).

9. A set of watertight rings (100) according to any one of claims 1 to 3, characterized in that the external peripheral shape of said first watertight ring (110) is circular or oval; or the surface of the external periphery of said first watertight ring (110) comprises at least one arc-shaped surface and at least one flat surface, said arc-shaped surface being connected to said flat surface or being connected to another said arc-shaped surface; or the external peripheral shape of said first watertight ring (110) being polygonal.

10. A watertight sealing device (10) used on the external rotor device, the watertight sealing device (10) comprises a watertight seal (20) and said set of watertight rings (100) according to any one of the preceding claims, said watertight seal (20) is arranged between said first watertight ring (110) and said second watertight ring (120) and is located in said containing part (130), furthermore the radial inner end of said watertight seal (20) protrudes from the inner lateral opening (131) of said containing part (130).

11. A watertight sealing device (10) according to claim 10 characterized in that said watertight seal (20) is an elastically deformable component.

12. An external rotor device comprising a body of the device, a motor equipped with a drive shaft and said watertight sealing device (10) according to any one of claims 10 and 11, said motor is arranged in the internal part of said body of the device, said drive shaft passes through said body of the device and can pivot, said watertight sealing device (10) is fitted onto said drive shaft and is connected to said body of the device, said watertight seal (20) abuts against the peripheral surface of said drive shaft.

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