A magnetic fluid seal

Abstract

The utility model discloses a magnetic fluid seal, comprising a device body, wherein the device body includes an outer shell and an inner ring, a connecting disk is connected to the top of the outer shell, a retaining ring groove is provided below the connecting disk and a rotating shaft passes through the connecting disk, a bearing is installed below the retaining ring groove, a vacuum spacer and a magnetic pole piece are installed below the bearing, a magnet groove is provided below the magnetic pole piece, a magnet is installed in the magnet groove, an atmosphere spacer is provided at the bottom of the rotating shaft, an end cover is provided below the atmosphere spacer, an injection tube is provided on the outer side wall of the outer shell, one end of the injection tube is connected to a guide needle tube, a half bolt is threaded in the injection tube, and the device can be injected with magnetic fluid according to the use needs, so as to realize the automatic replenishment of magnetic fluid between the magnetic component and the rotating shaft, thereby ensuring the air tightness of the magnetic fluid seal and avoiding the problem that the device disassembly structure is complicated and inconvenient to replenish magnetic fluid.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic fluid sealing, and in particular relates to a magnetic fluid sealing component. Background Art

[0002] Magnetic fluid sealing technology is developed based on magnetic fluid. When magnetic fluid is injected into the gap of the magnetic field, it can fill the entire gap to form a "liquid O-ring". The function of magnetic fluid seals is to transmit rotational motion to the sealed container and is often used for vacuum sealing.

[0003] During the use of existing magnetic fluid seals, the magnetic fluid in the magnetic fluid seals will decrease. For example, in a high temperature environment, the base liquid of the magnetic fluid will evaporate, making it impossible to maintain the sealing of the sealing film. The existing method of adding magnetic fluid to the magnetic fluid seal is to disassemble the entire magnetic fluid seal, inject a sufficient amount of magnetic fluid, then reinstall it and evacuate the gas to re-form a sealed environment. The operation is cumbersome. Therefore, we need to upgrade and transform it based on the existing technology. Utility Model Content

[0004] The purpose of the utility model is to provide a magnetic fluid seal to solve the problems raised in the above background technology.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] A magnetic fluid seal is designed, including a device body, which includes an outer shell and an inner ring, a connecting disk is connected to the top of the outer shell, a retaining ring groove is provided below the connecting disk and a rotating shaft passes through the connecting disk, a bearing is installed below the retaining ring groove, a vacuum spacer and a magnetic pole piece are installed below the bearing, a magnet groove is provided below the magnetic pole piece, a magnet is installed in the magnet groove, an atmosphere spacer is provided at the bottom of the rotating shaft, an end cover is provided below the atmosphere spacer, an injection tube is provided on the outer side wall of the outer shell, one end of the injection tube is connected to a guide needle tube, a half bolt is threaded in the injection tube, and a nut is connected to the front end of the half bolt.

[0007] Furthermore, a placement groove is provided in the inner ring, and a sealing ring is installed in the placement groove.

[0008] Furthermore, a countersunk groove is provided in the injection tube, the front end of the half bolt is connected to a nut, and a countersunk groove is installed in the nut.

[0009] Furthermore, a cross groove is provided in the nut, and the cross groove is in a "cross" shape.

[0010] Furthermore, one end of the half bolt is connected to a sealing rubber plug, and the sealing rubber plug is fixedly connected to the half bolt.

[0011] Furthermore, the connection plate is provided with mounting holes, and the mounting holes are provided in multiple groups.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model can inject magnetic fluid into the device according to the needs of use by arranging a liquid injection tube, a guide needle tube, a countersunk groove, a nut, a cross groove, a half bolt and a sealing plug, so as to realize automatic replenishment of magnetic fluid between the magnetic component and the rotating shaft, ensure the airtightness of the magnetic fluid seal, increase the practicality and convenience of the device, and avoid the problem that the disassembly structure of the device is complicated and it is inconvenient to replenish the magnetic fluid.

[0014] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a three-dimensional diagram of the overall structure of a magnetic fluid seal according to the utility model;

[0017] Figure 2 It is a cross-sectional view of the overall structure of a magnetic fluid seal according to the utility model;

[0018] Figure 3 A three-dimensional diagram of the internal structure of a magnetic fluid seal according to the utility model;

[0019] Figure 4 A three-dimensional diagram of the adjustment structure of a magnetic fluid seal according to the utility model;

[0020] Figure 5 The utility model is an exploded view of the adjustment structure of a magnetic fluid seal.

[0021] In the figure: 1, device body; 2, outer shell; 201, inner ring; 3, connecting plate; 4, mounting hole; 5, rotating shaft; 6, vacuum spacer; 7, bearing; 8, retaining ring groove; 9, magnet groove; 91, pole piece; 10, magnet; 11, atmosphere spacer; 12, placement groove; 13, sealing ring; 14, end cover; 15, injection tube; 16, guide needle tube; 17, countersunk groove;

[0022] 18. Nut; 19. Cross groove; 20. Half bolt; 21. Sealing plug. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figure 1 - Figure 5 As shown, a magnetic fluid seal provided in this embodiment includes a device body 1, which includes an outer shell 2 and an inner ring 201, a connecting plate 3 is connected to the top of the outer shell 2, a retaining ring groove 8 is provided below the connecting plate 3 and a rotating shaft 5 passes through the connecting plate 3, a bearing 7 is installed below the retaining ring groove 8, a vacuum spacer 6 and a pole piece 91 are installed below the bearing 7, a magnet groove 9 is provided below the pole piece 91, a magnet 10 is installed in the magnet groove 9, an atmosphere spacer 11 is provided at the bottom of the rotating shaft 5, an end cover 14 is provided below the atmosphere spacer 11, an injection tube 15 is provided on the outer wall of the outer shell 2, one end of the injection tube 15 is connected to the guide needle tube 16, a half bolt 20 is threaded in the injection tube 15, and a nut 18 is connected to the front end of the half bolt 20.

[0025] Preferably, a placement groove 12 is provided in the inner ring 201, and a sealing ring 13 is installed in the placement groove 12, which is convenient for the user to install and fix the sealing ring 13, providing convenience for the user. A countersunk groove 17 is provided in the injection tube 15, and the front end of the half bolt 20 is connected to the nut 18, and a countersunk groove 17 is installed in the nut 18, which can store and fix the nut 18, thereby preventing the nut 18 from being exposed during the installation process and affecting the aesthetics of the device.

[0026] Preferably, a cross groove 19 is provided in the nut 18, and the cross groove 19 is in a "cross" shape, which can facilitate the user to rotate and adjust the nut 18 through the cross groove 19, providing convenience for the user. One end of the half bolt 20 is connected to the sealing plug 21, and the sealing plug 21 is fixedly connected to the half bolt 20. By providing the sealing plug 21, the safety of the injection tube 15 during use is guaranteed, and leakage of the injection tube 15 is avoided. A mounting hole 4 is provided in the connecting plate 3, and a plurality of mounting holes 4 are provided. By providing the mounting holes 4, the device can be installed and fixed, avoiding the trouble of inconvenient installation of the device.

[0027] The use principle and use process of the utility model are as follows: when in use, the user uses a tool to rotate the cross groove 19 of the nut 18 with the tool to remove the half bolt 20 from the injection tube 15. When the half bolt 20 is taken out, the sealing plug 21 is taken out from the injection tube 15, and the magnetic fluid is injected into the injection tube 15. The magnetic fluid injected into the injection tube 15 enters the device through the guide needle tube 16. The device can be injected with magnetic fluid according to the use needs, and the magnetic fluid is automatically replenished between the magnetic component and the rotating shaft 5, thereby ensuring the airtightness of the magnetic fluid seal, increasing the practicality and convenience of the device, and avoiding the problem that the device has a complicated disassembly structure and is inconvenient to replenish the magnetic fluid.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The present invention is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on the spirit and principles of the present invention, and these modifications and variations are also within the scope of the present invention.

Claims

1. A magnetic fluid seal, characterized in that: The invention comprises a device body (1), wherein the device body (1) comprises an outer shell (2) and an inner ring (201), a connection plate (3) is connected to the upper part of the outer shell (2), a retaining ring groove (8) is provided below the connection plate (3), and a rotating shaft (5) passes through the connection plate (3), a bearing (7) is installed below the retaining ring groove (8), a vacuum spacer (6) and a magnetic pole piece (91) are installed below the bearing (7), and a magnetic pole piece (91) is provided below the magnetic pole piece (91). An iron groove (9), a magnet (10) is installed in the magnet groove (9), an atmosphere spacer (11) is provided at the bottom of the rotating shaft (5), an end cover (14) is provided below the atmosphere spacer (11), an injection pipe (15) is provided on the outer wall of the outer shell (2), one end of the injection pipe (15) is connected to the guide needle tube (16), a half bolt (20) is screwed inside the injection pipe (15), and the front end of the half bolt (20) is connected to the nut (18).

2. A magnetic fluid seal according to claim 1, characterized in that: A placement groove (12) is provided in the inner ring (201), and a sealing ring (13) is installed in the placement groove (12).

3. A magnetic fluid seal according to claim 1, characterized in that: The liquid injection pipe (15) is provided with a countersunk groove (17), the front end of the half bolt (20) is connected to a nut (18), and the nut (18) is provided with a countersunk groove (17).

4. A magnetic fluid seal according to claim 3, characterized in that: A cross groove (19) is provided in the nut (18), and the cross groove (19) is in a "cross" shape.

5. A magnetic fluid seal according to claim 1, characterized in that: One end of the half bolt (20) is connected to a sealing rubber plug (21), and the sealing rubber plug (21) is fixedly connected to the half bolt (20).

6. A magnetic fluid seal according to claim 1, characterized in that: The connection plate (3) is provided with mounting holes (4), and the mounting holes (4) are provided in a plurality of groups.

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