Magnetic liquid sealing device with arc-shaped pole teeth

Abstract

The invention discloses a magnetic liquid sealing device with arc-shaped pole teeth. The method comprises the steps that a cavity is formed in a supporting seat, the supporting seat sleeves a rotating shaft, the rotating shaft is sleeved with a shaft sleeve, the shaft sleeve is arranged in the cavity of the supporting seat, and a groove is formed in the shaft sleeve; the first bearing and the second bearing are arranged on the rotating shaft in a sleeving mode, arranged on the two sides of the shaft sleeve and tightly attached to the shaft sleeve, the first bearing and the second bearing are tightly attached to the inner wall of the cavity, and the first magnetism isolating ring, the first pole shoe, the permanent magnet, the second pole shoe and the second magnetism isolating ring are tightly attached to each other and sequentially arranged on the shaft sleeve in a sleeving mode. The second bearing is tightly attached to the second magnetism isolating ring; the first pole shoe and the second pole shoe are provided with arc-shaped pole teeth, the tail ends of the arc-shaped pole teeth are provided with arc-shaped concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped concave surfaces abut against the inner bottom surfaces of the grooves to form concave sealing gaps, and the concave sealing gaps are filled with the magnetic liquid. The sealing effect can be improved, and the sealing stability is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical seals, and in particular relates to an arc-shaped pole tooth magnetic liquid sealing device. Background Art

[0002] Due to various reasons, the oil-cooled electric drum has coolant leakage at the connection between the shaft end and the box body. A seal is required here to prevent the coolant leakage of the electric drum and to prevent foreign matter from entering the mechanical equipment to ensure the normal operation of the machine. However, traditional sealing methods are difficult to meet the sealing requirements of this specific working condition.

[0003] Compared with traditional mechanical seals, magnetic liquid seals have the advantages of tight sealing, zero leakage, long service life, high reliability, complete pollution-free, ability to withstand high speeds, optimal torque transmission, low viscous friction, etc. Therefore, they are used by more and more industries and can also be used at the connection between the shaft end and the box of oil-cooled electric drums.

[0004] However, under high-speed rotation conditions, the existing magnetic liquid seals are prone to the problem of the magnetic liquid sealing film being squeezed to one side and ruptured. In particular, when the shaft rotates, the magnetic liquid in the sealing gap may be thrown out, causing the magnetic liquid sealing film to be damaged and resulting in sealing failure. In addition, in the case of large-diameter shafts, the pole teeth on the existing sealing pole shoes have a small cross-section and a poor sealing effect, which cannot achieve the sealing effect under high-pressure conditions. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an arc-shaped pole tooth magnetic liquid sealing device, which can improve the sealing effect, enhance the sealing stability, and achieve the sealing effect under high-speed rotation and high-pressure conditions.

[0006] To achieve the above objectives, the present invention proposes the following technical solutions: A circular arc pole gear magnetic liquid sealing device comprises a rotary shaft, a support seat, an end cover, a sealing cavity and a sealing assembly; the sealing cavity and the end cover are respectively connected to the two end surfaces of the support seat by screws.

[0007] The support seat is provided with a chamber and the support seat is sleeved on the rotary shaft. The rotary shaft is sleeved with a shaft sleeve, which is placed in the chamber of the support seat and has a groove on it.

[0008] The sealing assembly is arranged in the chamber, and the sealing assembly includes a first bearing, a first magnetic isolation ring, a first pole shoe, a permanent magnet, a magnetic liquid, a second pole shoe, a second magnetic isolation ring, and a second bearing. The first bearing and the second bearing are directly sleeved on the rotating shaft, and the inner sides of the first bearing and the second bearing are respectively tightly attached to the two sides of the sleeve, and the outer sides of the first bearing and the second bearing are respectively tightly attached to the inner walls of the two sides of the chamber. The first magnetic isolation ring, the first pole shoe, the permanent magnet, the second pole shoe, and the second magnetic isolation ring are sequentially sleeved on the sleeve of the rotating shaft and tightly attached to each other. The inner side of the first bearing is tightly attached to the first magnetic isolation ring, and the inner side of the second bearing is tightly attached to the second magnetic isolation ring.

[0009] The first pole shoe and the second pole shoe are provided with arc-shaped pole teeth, the ends of the arc-shaped pole teeth are provided with arc-shaped inner concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped inner concave surfaces of the arc-shaped pole teeth are abutted against the inner bottom surface of the grooves and form an inner concave sealing gap, and the magnetic liquid is filled in the inner concave sealing gap to form a magnetic seal.

[0010] The number of arc-shaped pole teeth is determined according to actual working conditions, and the depth of the concave sealing gap is determined according to actual working conditions.

[0011] Preferably, the outer wall of the first pole shoe is provided with a first sealing groove, in which a first sealing ring is embedded, and the outer wall of the second pole shoe is provided with a second sealing groove, in which a second sealing ring is embedded, the first sealing ring and the second sealing ring are squeezed with the concave sealing gap to form a static seal, and at the same time, the first sealing ring and the second sealing ring are squeezed with the inner circular surface of the chamber to form a static seal, thereby further enhancing the sealing effect.

[0012] Preferably, the groove is a trapezoidal groove, the upper width of the trapezoidal groove is smaller than the lower width, and the width of the arc-shaped pole tooth matches the upper width of the trapezoidal groove, so that the magnetic liquid in the concave sealing gap is less likely to be squeezed out or thrown out, thereby extending the service life of the magnetic liquid and further enhancing the sealing effect.

[0013] Preferably, a third sealing groove is provided on the end surface where the support seat is connected to the sealing cavity, a third sealing ring is embedded in the third sealing groove, and the third sealing ring and the inner side surface of the sealing cavity are squeezed against each other to form a static seal, thereby further enhancing the sealing effect.

[0014] Preferably, the support seat, rotating shaft, end cover, first magnetic isolation ring, second magnetic isolation ring and sealing cavity are made of non-magnetic materials, such as stainless steel 304; the first pole shoe, the second pole shoe and the sleeve are made of magnetic materials, such as 2Cr13; the permanent magnet is made of materials with good magnetic properties, such as NdFeB, which saves costs and better protects the magnetic field from being disturbed by external factors.

[0015] The magnetic conductive material, non-magnetic conductive material and NdFeB mentioned above are already known in the prior art.

[0016] Preferably, the arc-shaped pole teeth correspond one-to-one to the grooves of the sleeve.

[0017] Preferably, the permanent magnet is arranged at a middle position in the chamber.

[0018] Preferably, the arc-shaped pole teeth have a consistent height, and the grooves of the sleeves have a consistent depth.

[0019] Preferably, a section of the shaft sleeve corresponding to the permanent magnet is a long groove, and the width of the long groove is consistent with the thickness of the permanent magnet, so that the sealing structure is more stable and reasonable, and is easy to produce and install.

[0020] The beneficial effects of the present invention are: The present invention provides a concave sealing gap between the shaft sleeve and the pole shoe, and the magnetic liquid is filled in the concave sealing gap to form a magnetic seal. When the magnetic liquid is moved to one side under the action of a large pressure difference, the magnetic liquid in the concave sealing gap is surrounded by the arc-shaped concave surface, so that the magnetic liquid in the concave sealing gap is not easily squeezed out of the pole teeth, thereby improving the ability of the magnetic liquid sealing film to resist deformation. At the same time, the magnetic liquid in the concave sealing gap overcomes the action of centrifugal force and is not easily thrown out, thereby extending the service life of the magnetic liquid.

[0021] The present invention provides a trapezoidal groove on the shaft sleeve, wherein the upper width is smaller than the lower width, and the width of the arc-shaped pole teeth matches the upper width of the trapezoidal groove, so that the magnetic liquid in the concave sealing gap is less likely to be squeezed out or thrown out, thereby extending the service life of the magnetic liquid. At the same time, it can effectively prevent the sealed medium from entering the concave sealing gap and prevent external dust from entering the sealing cavity, thereby forming a double-sided sealing medium and further improving the sealing effect.

[0022] By adopting the above scheme, the present invention can improve the sealing effect, enhance the sealing stability, and achieve the sealing effect under high-speed rotation and high-pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0025] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle.

[0026] In the figure, 1-support seat, 2-first bearing, 3-first magnetic isolation ring, 4-first sealing ring, 5-first pole shoe, 6-permanent magnet, 7-magnetic liquid, 8-rotating shaft, 9-sealed cavity, 10-third sealing ring, 11-second bearing, 12-second magnetic isolation ring, 13-second sealing ring, 14-second pole shoe, 15-sleeve, 16-end cover. Implementation

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "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 drawings, and are only for the convenience of describing the present invention 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 the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] First embodiment: like Figure 1 As shown, an arc-shaped pole tooth magnetic liquid sealing device includes a rotary shaft 8, a support seat 1, an end cover 16, a sealing cavity 9 and a sealing assembly; the sealing cavity 9 and the end cover 16 are respectively connected to the two end surfaces of the support seat 1 by screws.

[0032] The support seat 1 is provided with a chamber therein and the support seat 1 is sleeved on the rotary shaft 8 . The rotary shaft 8 is sleeved with a shaft sleeve 15 . The shaft sleeve 15 is placed in the chamber of the support seat 1 , and a groove is provided on the shaft sleeve 15 .

[0033] The sealing assembly is arranged in the chamber, and the sealing assembly includes a first bearing 2, a first magnetic isolation ring 3, a first pole shoe 5, a permanent magnet 6, a magnetic liquid 7, a second pole shoe 14, a second magnetic isolation ring 12, and a second bearing 11. The first bearing 2 and the second bearing 11 are directly sleeved on the rotating shaft 8, and the inner sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the two sides of the sleeve 15, and the outer sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the inner walls on both sides of the chamber. The first magnetic isolation ring 3, the first pole shoe 5, the permanent magnet 6, the second pole shoe 14, and the second magnetic isolation ring 12 are sequentially sleeved on the sleeve 15 of the rotating shaft 8 and are tightly attached to each other. The inner side of the first bearing 2 is tightly attached to the first magnetic isolation ring 3, and the inner side of the second bearing 11 is tightly attached to the second magnetic isolation ring 12.

[0034] like Figure 2 As shown, the first pole shoe 5 and the second pole shoe 14 are provided with arc-shaped pole teeth, the ends of the arc-shaped pole teeth are provided with arc-shaped inner concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped inner concave surfaces of the arc-shaped pole teeth are abutted against the inner bottom surface of the grooves and form an inner concave sealing gap, and the magnetic liquid 7 is filled in the inner concave sealing gap to form a magnetic seal.

[0035] Second embodiment: like Figure 1 As shown, an arc-shaped pole tooth magnetic liquid sealing device includes a rotary shaft 8, a support seat 1, an end cover 16, a sealing cavity 9 and a sealing assembly; the sealing cavity 9 and the end cover 16 are respectively connected to the two end surfaces of the support seat 1 by screws.

[0036] The support seat 1 is provided with a chamber therein and the support seat 1 is sleeved on the rotary shaft 8 . The rotary shaft 8 is sleeved with a shaft sleeve 15 . The shaft sleeve 15 is placed in the chamber of the support seat 1 , and a groove is provided on the shaft sleeve 15 .

[0037] The sealing assembly is arranged in the chamber, and the sealing assembly includes a first bearing 2, a first magnetic isolation ring 3, a first pole shoe 5, a permanent magnet 6, a magnetic liquid 7, a second pole shoe 14, a second magnetic isolation ring 12, and a second bearing 11. The first bearing 2 and the second bearing 11 are directly sleeved on the rotating shaft 8, and the inner sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the two sides of the sleeve 15, and the outer sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the inner walls on both sides of the chamber. The first magnetic isolation ring 3, the first pole shoe 5, the permanent magnet 6, the second pole shoe 14, and the second magnetic isolation ring 12 are sequentially sleeved on the sleeve 15 of the rotating shaft 8 and are tightly attached to each other. The inner side of the first bearing 2 is tightly attached to the first magnetic isolation ring 3, and the inner side of the second bearing 11 is tightly attached to the second magnetic isolation ring 12.

[0038] like Figure 2As shown, the first pole shoe 5 and the second pole shoe 14 are provided with arc-shaped pole teeth, the ends of the arc-shaped pole teeth are provided with arc-shaped inner concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped inner concave surfaces of the arc-shaped pole teeth are abutted against the inner bottom surface of the grooves and form an inner concave sealing gap, and the magnetic liquid 7 is filled in the inner concave sealing gap to form a magnetic seal.

[0039] The outer wall of the first pole shoe 5 is provided with a first sealing groove, in which a first sealing ring 4 is embedded; the outer wall of the second pole shoe 14 is provided with a second sealing groove, in which a second sealing ring 13 is embedded; the first sealing ring 4 and the second sealing ring 13 are squeezed with the inner concave sealing gap to form a static seal; at the same time, the first sealing ring 4 and the second sealing ring 13 are squeezed with the inner circular surface of the chamber to form a static seal.

[0040] A third sealing groove is provided on the end surface where the support seat 1 is connected to the sealing cavity 9. A third sealing ring 13 is embedded in the third sealing groove. The third sealing ring 13 and the inner side surface of the sealing cavity 9 are pressed against each other to form a static seal.

[0041] Third embodiment: like Figure 1 As shown, an arc-shaped pole tooth magnetic liquid sealing device includes a rotary shaft 8, a support seat 1, an end cover 16, a sealing cavity 9 and a sealing assembly; the sealing cavity 9 and the end cover 16 are respectively connected to the two end surfaces of the support seat 1 by screws.

[0042] The support seat 1 is provided with a chamber therein and the support seat 1 is sleeved on the rotary shaft 8 . The rotary shaft 8 is sleeved with a shaft sleeve 15 . The shaft sleeve 15 is placed in the chamber of the support seat 1 , and a groove is provided on the shaft sleeve 15 .

[0043] The sealing assembly is arranged in the chamber, and the sealing assembly includes a first bearing 2, a first magnetic isolation ring 3, a first pole shoe 5, a permanent magnet 6, a magnetic liquid 7, a second pole shoe 14, a second magnetic isolation ring 12, and a second bearing 11. The first bearing 2 and the second bearing 11 are directly sleeved on the rotating shaft 8, and the inner sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the two sides of the sleeve 15, and the outer sides of the first bearing 2 and the second bearing 11 are respectively tightly attached to the inner walls on both sides of the chamber. The first magnetic isolation ring 3, the first pole shoe 5, the permanent magnet 6, the second pole shoe 14, and the second magnetic isolation ring 12 are sequentially sleeved on the sleeve 15 of the rotating shaft 8 and are tightly attached to each other. The inner side of the first bearing 2 is tightly attached to the first magnetic isolation ring 3, and the inner side of the second bearing 11 is tightly attached to the second magnetic isolation ring 12.

[0044] like Figure 2As shown, the first pole shoe 5 and the second pole shoe 14 are provided with arc-shaped pole teeth, the ends of the arc-shaped pole teeth are provided with arc-shaped inner concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped inner concave surfaces of the arc-shaped pole teeth are abutted against the inner bottom surface of the grooves and form an inner concave sealing gap, and the magnetic liquid 7 is filled in the inner concave sealing gap to form a magnetic seal.

[0045] The groove is a trapezoidal groove, the upper width of the trapezoidal groove is smaller than the lower width, and the width of the arc-shaped pole tooth matches the upper width of the trapezoidal groove, making it more difficult for the magnetic liquid 7 in the concave sealing gap to be squeezed out or thrown out, thereby extending the service life of the magnetic liquid 7.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circular arc pole gear magnetic liquid sealing device, comprising a rotary shaft, a support seat, an end cover, a sealing cavity and a sealing assembly; the sealing cavity and the end cover are respectively connected to the two end surfaces of the support seat by screws, characterized in that: The support seat is provided with a chamber and the support seat is sleeved on the rotating shaft, the rotating shaft is sleeved with a shaft sleeve, the shaft sleeve is placed in the chamber of the support seat, and the shaft sleeve is provided with a groove; the sealing assembly is arranged in the chamber, and the sealing assembly includes a first bearing, a first magnetic isolation ring, a first pole shoe, a permanent magnet, a magnetic liquid, a second pole shoe, a second magnetic isolation ring, and a second bearing. The first bearing and the second bearing are directly sleeved on the rotating shaft and placed on both sides of the shaft sleeve, the inner sides of the first bearing and the second bearing are in close contact with the shaft sleeve, and the first bearing and the second bearing are The outer side is in close contact with the inner wall of the chamber, the first magnetic isolation ring, the first pole shoe, the permanent magnet, the second pole shoe, and the second magnetic isolation ring are in close contact with each other and are sequentially sleeved on the shaft sleeve, the first bearing is in close contact with the first magnetic isolation ring, and the second bearing is in close contact with the second magnetic isolation ring; the first pole shoe and the second pole shoe are provided with arc-shaped pole teeth, the ends of the arc-shaped pole teeth are provided with arc-shaped inner concave surfaces, the arc-shaped pole teeth are inserted into the grooves, the arc-shaped inner concave surfaces are abutted against the inner bottom surface of the grooves to form an inner concave sealing gap, and the magnetic liquid is filled in the inner concave sealing gap to form a magnetic seal.

2. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: A first sealing groove is provided on the outer wall of the first pole shoe, a first sealing ring is embedded in the first sealing groove, a second sealing groove is provided on the outer wall of the second pole shoe, a second sealing ring is embedded in the second sealing groove, the first sealing ring and the second sealing ring are squeezed with the inner concave sealing gap to form a static seal, and at the same time, the first sealing ring and the second sealing ring are squeezed with the inner circular surface of the chamber to form a static seal.

3. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: The groove is a trapezoidal groove, the upper width of the trapezoidal groove is smaller than the lower width, and the width of the arc-shaped pole tooth matches the upper width of the trapezoidal groove.

4. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: A third sealing groove is arranged on the end surface where the support seat is connected to the sealing cavity. A third sealing ring is embedded in the third sealing groove. The third sealing ring and the inner side surface of the sealing cavity are pressed against each other to form a static seal.

5. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: The support seat, rotating shaft, end cover, first magnetic isolation ring, second magnetic isolation ring and sealing cavity are made of non-magnetic materials, the first pole shoe, second pole shoe and shaft sleeve are made of magnetic materials, and the permanent magnet is made of NdFeB.

6. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: The arc-shaped pole teeth correspond to the grooves of the shaft sleeve one by one.

7. The arc-shaped pole tooth magnetic liquid sealing device according to claim 1, characterized in that: The arc-shaped pole teeth have the same height, and the grooves of the sleeves have the same depth.

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