Rotating shaft waterproof structure

Abstract

The application relates to the technical field of rotating shaft waterproof technology, and discloses a rotating shaft waterproof structure which comprises a mounting seat, a sealing component and a pressure reduction component. The mounting seat is internally provided with a mounting cavity, a rotating shaft can penetrate through the mounting cavity and be connected with a driving component; the sealing component is sleeved on the outer wall of the rotating shaft, the end wall of the sealing component abuts against the inner wall of the mounting cavity, a dynamic sealing structure is formed between the inner wall of the mounting cavity and the end wall of the rotating shaft; the pressure reduction component is sleeved on the outer wall of the rotating shaft and is sealed with the sealing component, a liquid pressure reduction structure is formed at the water inlet end of the mounting cavity, the sealing end surface of the sealing component is perpendicular to the water flow direction, direct water flow impact can be effectively avoided, the sealing component is prevented from being deformed, the sealing effect and the service life are improved; the labyrinth sealing structure is formed at the water inlet end of the rotating shaft through the pressure reduction component, the water inlet water pressure can be effectively reduced, the risk of pressure deformation of the sealing component is further reduced, and the sealing property and the service life of the sealing structure are further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of rotating shaft waterproofing, and in particular relates to a waterproof structure for a rotating shaft. Background Art

[0002] A waterproof shaft requires a waterproof structure to prevent water from entering the motor housing and damaging electrical components. Most existing technologies use lip seals, often made of rubber. However, these seals suffer from high friction between the seal and the shaft, resulting in significant power loss. Furthermore, water pressure directly impacts the end faces of the seal, creating a significant pressure differential between the two sides. This can easily cause the seal to deform, leading to seal failure and damage to electrical components due to water ingress. Summary of the Invention

[0003] The present invention aims to provide a waterproof structure for a rotating shaft to solve at least one of the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0005] In some embodiments of the present application, a rotating shaft waterproof structure is provided, comprising:

[0006] A mounting seat having a mounting cavity therein, through which the rotating shaft can pass to connect with the driving component;

[0007] a sealing component, sleeved on the outer wall of the rotating shaft, with its end wall abutting against the inner wall of the mounting cavity, so as to form a dynamic sealing structure between the inner wall of the mounting cavity and the end wall of the rotating shaft;

[0008] The decompression component is sleeved on the outer wall of the rotating shaft and is in close contact with the sealing component to form a liquid decompression structure at the water inlet end of the installation cavity.

[0009] In a preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, a sealing protrusion is provided on the sealing end of the sealing component, and a dynamic seal is formed between the sealing protrusion and the inner wall opposite to the sealing cavity.

[0010] In a preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, the fitting ends of the sealing component and the decompression component are connected via a labyrinth sealing structure 1.

[0011] In the preferred embodiment of the above-mentioned rotating shaft waterproof structure, the sealing component is connected to the rotating shaft via a connecting key, and the sealing component can slide along the axial direction of the rotating shaft using the connecting key as a slide rail;

[0012] The fitting end of the sealing component is provided with a compression component, and abuts against the shaft shoulder of the rotating shaft through the compression component.

[0013] In the preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, the sealing component includes:

[0014] A sealing dynamic ring is sleeved on the outside of the rotating shaft, with its outer wall abutting against the inner wall of the mounting cavity. One end of the sealing dynamic ring is dynamically sealed with the mounting cavity through the sealing protrusion, and the other end is connected to the decompression component through the labyrinth sealing structure. A sliding key groove is provided on the inner wall of the sealing dynamic ring, and the sealing dynamic ring is key-connected to the rotating shaft through the sliding key groove. The sealing dynamic ring can slide along the axial direction of the rotating shaft within the length of the sliding key groove.

[0015] The sealing gasket is arranged between the inner wall of the sealing dynamic ring and the outer wall of the rotating shaft to form a seal.

[0016] In the preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, a connecting groove is formed on the side of the sealing dynamic ring corresponding to the shaft shoulder; the compression component is arranged in the connecting groove and can push the sealing dynamic ring to move axially along the rotating shaft.

[0017] In a preferred embodiment of the above-mentioned rotating shaft waterproof structure, the inner side of the decompression component is connected to the rotating shaft via a second labyrinth sealing structure, and the outer side abuts against the inner wall of the installation cavity.

[0018] In the preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, the decompression component includes: barrier ring 1, barrier ring 2 and barrier ring 3; the barrier ring 1, barrier ring 2 and barrier ring 3 are arranged in sequence along the water inlet direction of the rotating shaft, and the tops of the barrier ring 1, barrier ring 2 and barrier ring 3 are abutted and sealed in sequence, and multiple gaps are formed at the bottom to form the labyrinth sealing structure 2 with the rotating shaft.

[0019] In the preferred embodiment of the above-mentioned rotating shaft waterproof structure, both side end walls of the barrier ring 1 are inclined toward the water inlet direction of the rotating shaft;

[0020] One end wall of the second barrier ring is inclined toward the water inlet direction of the rotating shaft, and the other end wall is perpendicular to the axis of the rotating shaft;

[0021] One side end wall of the barrier ring three is inclined toward the direction of the sealing dynamic ring, and the other side end wall is connected to the sealing dynamic ring through a labyrinth sealing structure.

[0022] In the preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, two barrier rings are provided and are arranged in abutment with each other in sequence.

[0023] In the preferred embodiment of the above-mentioned waterproof structure of the rotating shaft, the sealing dynamic ring is made of polytetrafluoroethylene;

[0024] And / or the sealing protrusion of the sealing dynamic ring is made of stainless steel.

[0025] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are:

[0026] The sealing end surface of the sealing component of the present application is perpendicular to the direction of water flow, which can effectively avoid direct impact of the water flow, prevent deformation of the sealing component, and improve the sealing effect and service life. In addition, the present application forms a labyrinth seal structure at the water inlet end of the rotating shaft through the pressure reducing component, which can effectively reduce the water pressure of the water inlet, further reducing the risk of pressure deformation of the sealing component and further ensuring the sealing performance.

[0027] This application uses a material with a low friction coefficient to prepare the sealing dynamic ring, which can ensure the service life of the sealing component, and can apply external force to the sealing dynamic ring through the compression component to ensure the sealing between the sealing dynamic ring and the installation cavity, prevent leakage after the sealing dynamic ring is worn, and greatly ensure the safety of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the waterproof structure of the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0031] In the picture:

[0032] 1. Mounting seat; 10. Bearing cover; 11. Bearing; 2. Rotating shaft; 20. Shaft shoulder; 3. Driving component; 30. Sealing box; 40. Sealing protrusion; 41. Labyrinth seal structure 1; 42. Keyway; 43. Sealing dynamic ring; 44. Sealing gasket; 5. Connecting key; 6. Compression component; 71. Blocking ring 1; 72. Blocking ring 2; 73. Blocking ring 3. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0038] See Figure 1-2 As shown, a shaft waterproof structure is described, including: a mounting seat 1, a sealing component and a pressure relief component; wherein,

[0039] An installation cavity is provided inside the mounting seat 1, and the rotating shaft 2 can pass through the installation cavity and be connected to the driving component 3; the sealing component is sleeved on the outer wall of the rotating shaft 2, and its end wall abuts against the inner wall of the installation cavity, so that a dynamic sealing structure is formed between the inner wall of the installation cavity and the end wall of the rotating shaft 2; the decompression component is sleeved on the outer wall of the rotating shaft 2, and fits and seals with the sealing component, forming a liquid decompression structure at the water inlet end of the installation cavity.

[0040] It should be noted that the mounting seat 1 is the existing technology and can be preferably a bearing seat. A bearing 11 mounting groove and a mounting groove for installing a sealing structure and a bearing cover 10 are respectively provided at both ends of the bearing seat. The bearing cover 10 is connected to the bearing seat through a bolt component and forms a mounting cavity with the mounting groove for installing the sealing structure; a plurality of bearings 11 are arranged in the bearing 11 mounting groove, and the outer ring component of the bearing 11 is fixed to the bearing 11 mounting groove. The rotating shaft 2 passes through the bearing cover 10, the pressure reducing component, and the sealing component in turn, and then passes through the inner rings of the plurality of bearings 11 in turn to form a dynamic sealing connection structure with the bearing seat. The penetrating end of the sealing component is connected to the driving component 3. When the rotating shaft 2 rotates under the action of the driving component 3, the water flow cannot pass through the mounting cavity, and thus cannot cause damage to electrical equipment such as the driving component 3.

[0041] It should be noted that the driving component 3 is of existing technology and can be preferably a motor, which is arranged in a sealed box 30 to prevent dust and water vapor from entering.

[0042] In the preferred technical solution of the above embodiment, a sealing protrusion 40 is provided on the sealing end of the sealing component, and a dynamic seal is formed between the sealing protrusion 40 and the inner wall opposite to the sealing cavity.

[0043] Specifically, the sealing protrusion 40 is an annular sealing strip, and can be a plurality of concentric annular protrusion structures.

[0044] It should be noted that by providing a sealing protrusion 40 at the sealing end, a seal is formed between the sealing protrusion 40 and the corresponding inner wall of the installation cavity, thereby changing the sealing direction of the traditional sealing ring seal, so that the impact force of the water flow cannot directly act on the sealing component, effectively solving the problem of leakage caused by deformation of the sealing ring under the impact of water flow, and improving the service life of the sealing component.

[0045] In the preferred technical solution of the above embodiment, the fitting ends of the sealing component and the decompression component are connected through a labyrinth sealing structure 41.

[0046] Specifically, a plurality of concentric annular comb tooth structures are provided on the end face of the sealing component facing the pressure reducing assembly, and a corresponding annular comb tooth structure is also provided on the end where the pressure reducing component abuts the sealing component. After the annular comb teeth are connected, they can hinder the entry of water flow, play a certain sealing role, and reduce the water flow pressure.

[0047] In the preferred technical solution of the above embodiment, the sealing component is connected to the rotating shaft 2 via the connecting key 5, and the sealing component can slide along the axial direction of the rotating shaft 2 using the connecting key 5 as a slide rail;

[0048] The fitting end of the sealing component is provided with a compression component 6 , and contacts the shoulder 20 of the rotating shaft 2 through the compression component 6 .

[0049] Specifically, a key groove 42 is formed on one side of the inner wall of the sealing component near one end, and the length of the key groove 42 is greater than the length of the connecting key 5, and the length difference exceeding the connecting key 5 is greater than or equal to the thickness of the sealing protrusion 40.

[0050] It should be noted that when the driving component 3 drives the rotating shaft 2 to work for a period of time, it will cause wear of the sealing protrusion 40. When wear occurs, the compression component 6 can push the sealing component to slide along the connecting key 5, so that the sealing protrusion 40 and the inner wall of the installation cavity always maintain a tightly fitted sealing state, which can effectively ensure the sealing of the structure.

[0051] In the preferred technical solution of the above embodiment, the sealing component includes: a sealing dynamic ring 43 and a sealing gasket 44;

[0052] The sealing dynamic ring 43 is sleeved on the outside of the rotating shaft 2, and its outer wall abuts against the inner wall of the installation cavity. One end of the sealing dynamic ring is dynamically sealed with the installation cavity through the sealing protrusion 40, and the other end is connected to the decompression component through a labyrinth sealing structure 41; a sliding key groove 42 is opened on the inner wall of the sealing dynamic ring 43, and the sealing dynamic ring 43 is key-connected to the rotating shaft 2 through the sliding key groove 42. The sealing dynamic ring 43 can slide along the axial direction of the rotating shaft 2 within the length range of the sliding key groove 42.

[0053] The sealing gasket 44 is disposed between the inner wall of the sealing dynamic ring 43 and the outer wall of the rotating shaft 2 to form a seal.

[0054] Specifically, the sealing dynamic ring 43 can be made of polytetrafluoroethylene;

[0055] And / or the sealing protrusion 40 of the sealing dynamic ring 43 is made of stainless steel.

[0056] Specifically, the sealing gasket 44 can be made of rubber material.

[0057] Specifically, the inner wall of the sealing dynamic ring 43 and the outer wall of the rotating shaft 2 are both provided with an accommodating groove for accommodating the sealing gasket 44 , and the sealing gasket 44 is preferably a gasket with a circular cross-section, through which sealing can be achieved.

[0058] It should be noted that the sealing dynamic ring 43 made of polytetrafluoroethylene or stainless steel has an extremely low friction coefficient, which can greatly reduce friction loss and greatly extend the service life of the sealing structure.

[0059] In the preferred technical solution of the above embodiment, a connecting groove is opened on the side of the sealing dynamic ring 43 corresponding to the shaft shoulder 20; the compression component 6 is arranged in the connecting groove, which can push the sealing dynamic ring 43 to move axially along the rotating shaft 2.

[0060] Specifically, there can be multiple connecting grooves, which are arranged in a circular array on the sealing dynamic ring 43; the rotating shaft 2 is provided with a shoulder 20 corresponding to the connecting groove, and the compression components 6 are respectively arranged in the corresponding connecting grooves, and their two ends are respectively connected to the shoulder 20 and the groove wall to provide extrusion force for the sealing dynamic ring 43.

[0061] It should be noted that the compression component 6 can preferably be a pressure spring, which is in a compressed state when placed between the connecting groove and the shaft shoulder 20, pressing the sealing dynamic ring 43 against the inner wall of the installation cavity to prevent leakage of the sealing structure after the sealing dynamic ring 43 is worn.

[0062] In the preferred technical solution of the above embodiment, the inner side of the decompression component is connected to the rotating shaft 2 via a second labyrinth sealing structure, and the outer side abuts against the inner wall of the installation cavity.

[0063] In the preferred technical solution of the above embodiment, the pressure reducing component includes: barrier ring 1 71, barrier ring 2 72 and barrier ring 3 73; barrier ring 1 71, barrier ring 2 72 and barrier ring 3 73 are arranged in sequence along the water inlet direction of the rotating shaft 2, and the tops of barrier ring 1 71, barrier ring 2 72 and barrier ring 3 73 are abutted and sealed in sequence, and multiple gaps are formed at the bottom to form a labyrinth sealing structure 2 with the rotating shaft 2.

[0064] It should be noted that the second labyrinth seal structure refers to a comb-teeth seal structure, which can be used for shaft sealing structures of non-toxic gases and liquids such as air, nitrogen, carbon dioxide, and water.

[0065] Specifically, both side end walls of the barrier ring 1 71 are inclined toward the water inlet direction of the rotating shaft 2;

[0066] One end wall of the second barrier ring 72 is inclined toward the water inlet direction of the rotating shaft 2, and the other end wall is perpendicular to the axis of the rotating shaft 2;

[0067] One end wall of the barrier ring 3 73 is inclined toward the sealing dynamic ring 43 , and the other end wall is connected to the sealing dynamic ring 43 via a labyrinth sealing structure 1.

[0068] Specifically, the barrier ring 1 71 is a conical ring structure with an abutment ring 1 provided on its edge. The convex side of the barrier ring 1 71 faces the direction of water inflow, which can decompose the axial pressure of the water.

[0069] The second barrier ring 72 is a conical ring structure with a second abutment ring corresponding to the first barrier ring 71 provided on its edge. The raised side of the second barrier ring 72 faces the direction of water inflow, and the other side is perpendicular to the rotating shaft 2. A gap is formed between the raised side and the inner side of the first barrier ring 71. The raised side can decompose the axial pressure of the water, and turbulent flow can be achieved when the water enters the gap.

[0070] One side of the barrier ring three 73 is a concave conical structure, and the edge is provided with an abutment ring three corresponding to the barrier ring two 72. The concave side of the barrier ring three 73 faces the direction of water inflow, and the other side is perpendicular to the rotating shaft 2. A gap is formed between the concave side and the inner side of the barrier ring two 72, which can decompose the axial pressure of water through the convex side, making it easier to achieve turbulence when the water flows into the gap.

[0071] Specifically, the gaps between the barrier ring 1 71 , the barrier ring 2 72 and the barrier ring 3 73 form a second labyrinth sealing structure of the rotating shaft 2 .

[0072] In the preferred embodiment of the waterproof structure of the rotating shaft 2, two barrier rings 71 are provided and are arranged in abutment with each other in sequence.

[0073] It should be noted that the above solution can achieve multiple pressure reductions of the water flow, which is beneficial to ensuring the strength of the seal and extending the service life of the sealing structure.

[0074] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are:

[0075] The sealing end surface of the sealing component of the present application is perpendicular to the direction of water flow, which can effectively avoid direct impact of the water flow, prevent deformation of the sealing component, and improve the sealing effect and service life; and the present application forms a labyrinth seal structure at the water inlet end of the rotating shaft 2 through the pressure reducing component, which can effectively reduce the water pressure of the water inlet, further reducing the risk of deformation of the sealing component due to pressure, and further ensuring the sealing performance;

[0076] The present application selects a material with a low friction coefficient to prepare the sealing dynamic ring 43, which can ensure the service life of the sealing component, and can apply external force to the sealing dynamic ring 43 through the compression component 6 to ensure the sealing between the sealing dynamic ring 43 and the installation cavity, and prevent leakage after the sealing dynamic ring 43 is worn, thereby greatly ensuring the safety of the seal.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waterproof structure for a rotating shaft, characterized in that: include: A mounting seat having a mounting cavity therein, through which the rotating shaft can pass to connect with the driving component; a sealing component, sleeved on the outer wall of the rotating shaft, with its end wall abutting against the inner wall of the mounting cavity, so as to form a dynamic sealing structure between the inner wall of the mounting cavity and the end wall of the rotating shaft; a decompression component, sleeved on the outer wall of the rotating shaft and sealingly fitted with the sealing component to form a liquid decompression structure at the water inlet end of the installation cavity; The sealing end of the sealing component is provided with a sealing protrusion, and a dynamic seal is formed by the sealing protrusion and the inner wall opposite to the installation cavity; The sealing component and the fitting ends of the decompression component are connected via a labyrinth sealing structure 1; The sealing component is connected to the rotating shaft via a connecting key, and the sealing component can slide along the axial direction of the rotating shaft using the connecting key as a slide rail; The fitting end of the sealing component is provided with a compression component, and abuts against the shoulder of the rotating shaft through the compression component; The sealing component includes: a sealing dynamic ring, sleeved on the outer side of the rotating shaft, with its outer wall abutting against the inner wall of the mounting cavity, one end of which is dynamically sealed with the mounting cavity via the sealing protrusion, and the other end of which is connected to the decompression component via the labyrinth seal structure; a sliding keyway is formed on the inner wall of the sealing dynamic ring, and the sealing dynamic ring is key-connected to the rotating shaft via the sliding keyway, and the sealing dynamic ring can slide along the axial direction of the rotating shaft within the length of the sliding keyway; The sealing gasket is arranged between the inner wall of the sealing dynamic ring and the outer wall of the rotating shaft to form a seal.

2. A shaft waterproof structure according to claim 1, characterized in that: A connecting groove is formed on one side of the sealing dynamic ring corresponding to the shaft shoulder; the compression component is arranged in the connecting groove and can push the sealing dynamic ring to move along the axial direction of the rotating shaft.

3. The waterproof structure of a rotating shaft according to claim 1, characterized in that: The inner side of the decompression component is connected to the rotating shaft via a second labyrinth sealing structure, and the outer side thereof abuts against the inner wall of the installation cavity.

4. A shaft waterproof structure according to claim 3, characterized in that: The decompression component includes: barrier ring 1, barrier ring 2 and barrier ring 3; the barrier ring 1, barrier ring 2 and barrier ring 3 are arranged in sequence along the water inlet direction of the rotating shaft, and the tops of the barrier ring 1, barrier ring 2 and barrier ring 3 are abutted and sealed in sequence, and multiple gaps are formed at the bottom, forming the labyrinth sealing structure 2 with the rotating shaft.

5. The waterproof structure of a rotating shaft according to claim 4, characterized in that: Both side end walls of the barrier ring 1 are inclined toward the water inlet direction of the rotating shaft; One end wall of the second barrier ring is inclined toward the water inlet direction of the rotating shaft, and the other end wall is perpendicular to the axis of the rotating shaft; One side end wall of the barrier ring three is inclined toward the direction of the sealing dynamic ring, and the other side end wall is connected to the sealing dynamic ring through a labyrinth sealing structure.

6. The waterproof structure of a rotating shaft according to claim 1, characterized in that: The sealing dynamic ring is made of polytetrafluoroethylene; And / or the sealing protrusion of the sealing dynamic ring is made of stainless steel.

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