Self-heating magnetic fluid sealing device

Abstract

The utility model relates to a self-heating magnetic fluid sealing device, which comprises a shell unit, an inner shaft, an outer shaft, a sealing unit, a sealing unit and a sealing unit, the shell unit is sleeved outside the inner shaft, and a storage space is formed between the shell unit and the inner shaft; the outer shaft is arranged on the outer side of the inner shaft in a sleeving mode and located in the storage space; the heating mechanism is arranged on the outer side of the outer shaft in a sleeving mode and located in the storage space; wherein the heating mechanism comprises a magnetic pole unit, the magnetic pole unit sleeves the outer side of the outer shaft, and a mounting groove is formed in the magnetic pole unit; the magnet unit is arranged on the outer side of the outer shaft in a sleeving mode, and the magnet unit is located at the end of the magnetic pole unit; the heat pipe is laid in the mounting groove; the heat pipe cover plate is arranged in the mounting groove, and the heat pipe cover plate is laid on the heat pipe; and the sealing cover is arranged in the mounting groove, and the sealing cover is laid on the heat pipe cover plate. By introducing the heating device, the working temperature of the inner magnetic pole and the magnetic liquid is ensured, so that the magnetic fluid structure can be used for transferring a refrigerant and can also bear a certain axial load.

Description

Technical Field

[0001] This invention belongs to the field of magnetic fluid sealing technology, and in particular to a self-heating magnetic fluid sealing device. Background Technology

[0002] In recent years, the development of vacuum equipment both domestically and internationally has been rapid. Magnetorheological fluid (MFL) seals have been widely used in many rotary sealing devices, such as in the sealing of vacuum equipment like single-crystal silicon furnaces, vacuum brazing furnaces, vacuum melting furnaces, chemical vapor deposition, ion plating, and liquid crystal regeneration equipment, as well as in low-temperature, high-pressure equipment and equipment with high environmental requirements. This improves product quality and yields significant economic benefits. However, traditional rubber seals become brittle and hard at extremely low temperatures, failing to completely enclose the rotating shaft, resulting in a decrease in vacuum. Ordinary magnetic fluids also experience a rapid increase in viscosity at low temperatures, leading to a sharp drop in vacuum. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a self-heating magnetic fluid sealing device that ensures the working temperature of the inner magnetic pole and the magnetic fluid.

[0004] To solve the above-mentioned technical problems, the present invention provides a self-heating magnetic fluid sealing device, comprising: a housing unit, wherein the housing unit is sleeved on the outside of the inner shaft, and a storage space is formed between the housing unit and the inner shaft;

[0005] An outer shaft, which is sleeved on the outside of the inner shaft and located within the storage space;

[0006] A heating mechanism, which is sleeved on the outside of the outer shaft and located within the storage space; wherein

[0007] The heating mechanism includes:

[0008] A magnetic pole unit, wherein the magnetic pole unit is sleeved on the outside of the outer shaft, and a mounting groove is provided on the magnetic pole unit;

[0009] A magnet unit, wherein the magnet unit is sleeved on the outside of the outer shaft, and the magnet unit is located at the end of the magnetic pole unit;

[0010] Heat pipe, which is laid in the mounting groove;

[0011] A heat pipe cover plate is disposed in the mounting groove and laid on the heat pipe;

[0012] A cover is provided in the mounting groove and laid on the heat pipe cover plate.

[0013] The magnetic pole unit includes:

[0014] A magnetic pole mounting base, which is sleeved on the outside of the outer shaft;

[0015] Magnetic poles, wherein the magnetic poles are disposed on the top of the magnetic pole mounting base.

[0016] The magnet unit includes:

[0017] A front magnet bracket and a rear magnet bracket are sleeved on the outside of the outer shaft, and the front magnet bracket and the rear magnet bracket are respectively located at both ends of the magnetic pole mounting base;

[0018] Magnets are disposed on the front magnet bracket and the rear magnet bracket.

[0019] Heat insulation rings are provided at the ends of the front magnet bracket and the rear magnet bracket, respectively.

[0020] A spacer is fitted on the outside of the inner shaft, and the spacer is disposed between the outer shaft and the inner shaft.

[0021] The outer shaft is fixed to the outside of the inner shaft by a ceramic spacer.

[0022] A water distribution unit is also sleeved on the outer side of the inner shaft, the water distribution unit comprising:

[0023] The water distribution cover has an arc structure, and a water distribution space is formed between the water distribution cover, the outer shell unit, and the heating mechanism;

[0024] An air inlet is provided on the outer casing unit. The air inlet is a through-hole that connects the outside to the water distribution space.

[0025] The discharge channel is a through-flow structure that connects the outside world to the water distribution space.

[0026] A magnetic shielding ring is fitted on the outer side of the inner shaft.

[0027] Bearings are provided at both ends inside the storage space.

[0028] A temperature sensor is provided at the bottom of the magnetic pole mounting base.

[0029] This utility model of a self-heating magnetic fluid sealing device introduces a heating device to ensure the working temperature of the inner magnetic pole and the magnetic fluid, making this magnetic fluid structure suitable for both refrigerant transfer and bearing a certain axial load. Attached Figure Description

[0030] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the structure of the self-heating magnetic fluid sealing device of this utility model.

[0032] Explanation of reference numerals in the attached drawings of this utility model's self-heating magnetic fluid sealing device:

[0033] Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0035] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] like Figure 1As shown, the self-heating magnetic fluid sealing device of this utility model mainly includes: an inner shaft 1, a threaded cover plate 2, an insulating magnetic shielding ring 5, a first heat insulation ring 6, a second heat insulation ring 23, a fiber spacer 25, a heat pipe 8, a magnetic pole 7, a magnet 21, a bearing 15, a retaining ring 19, a cover 10, a locking nut 24, a front ceramic spacer 12, a rear ceramic spacer 13, a front magnet bracket 20, and a rear magnet bracket 22. The bearing 15 has a threaded cover plate 2 and a retaining ring 19 on one side. Simultaneously, between the bearings 15 at both ends, the insulating magnetic shielding ring 5, the first heat insulation ring 6, the front magnet bracket 20, the magnet 21, the magnetic pole 7 (mounted on the magnetic pole mounting base 27), the rear magnet bracket 22, the second heat insulation ring 23, and the rear top cover 18 are sequentially installed. The heating structure body of the shaft magnetic pole 7 includes a semiconductor heating element, a heat pipe 8, a cover 10, and a temperature sensor 26.

[0037] Specifically, the self-heating magnetic fluid sealing device of this utility model includes: a housing unit 16, which is sleeved on the outside of the inner shaft 1, forming a storage space between the housing unit 16 and the inner shaft 1; an outer shaft 11, which is sleeved on the outside of the inner shaft 1 and located within the storage space; and a heating mechanism, which is sleeved on the outside of the outer shaft 11 and located within the storage space. The heating mechanism includes: a magnetic pole unit 7, which is sleeved on the outside of the outer shaft 11 and has an installation groove; a magnet unit 21, which is sleeved on the outside of the outer shaft 11 and located at the end of the magnetic pole unit 7; a heat pipe 8, which is laid in the installation groove; a heat pipe cover plate 9, which is set in the installation groove and laid on the heat pipe 8; and a cap 10, which is set in the installation groove and laid on the heat pipe cover plate 9.

[0038] The magnetic pole 7 unit includes: a magnetic pole mounting base 27, which is sleeved on the outside of the outer shaft 11; and a magnetic pole 7, which is located on top of the magnetic pole mounting base 27.

[0039] The magnet 21 unit includes: a front magnet bracket 20 and a rear magnet 21 bracket, which are sleeved on the outside of the outer shaft 11 and located at both ends of the magnetic pole mounting base 27; and a magnet 21, which is mounted on the front magnet bracket 20 and the rear magnet 21 bracket.

[0040] Heat insulation rings are provided at the ends of the front magnet bracket 20 and the rear magnet bracket 21, respectively. A spacer 25 is fitted on the outside of the inner shaft 1, and the spacer 25 is positioned between the outer shaft 11 and the inner shaft 1. The outer shaft 11 is fixed to the outside of the inner shaft 1 by a ceramic spacer. A magnetic shielding ring 5 is fitted on the outside of the inner shaft 1. Bearings 15 are provided at both ends inside the storage space. A temperature sensor 26 is provided at the bottom of the magnetic pole mounting base 27.

[0041] A water distribution unit is also sleeved on the outer side of the inner shaft 1. The water distribution unit includes: a water distribution cover 14, which has an arc-shaped structure and forms a water distribution space between the water distribution cover 14, the outer shell 16 unit, and the heating mechanism; an air inlet 28, which is provided on the outer shell 16 unit and is through-hole, connecting the outside to the water distribution space; and a discharge trough 29, which is through-hole, connecting the outside to the water distribution space.

[0042] During operation, the power unit connects to the inner shaft 1, with the two ends of the inner shaft 1 connected to the device 3 and the input bearing 4, respectively. A threaded cover plate 2 is provided at the connection end between the inner shaft 1 and the device 3. A refrigerant is introduced through the central water hole of the inner shaft 1 to cool the device 3. When the vacuum device 3 operates, the inner shaft 1 cools rapidly under the action of the refrigerant. When the temperature sensor 26 detects that the temperature of the magnetic pole 7 is too low, the copper electrode of the semiconductor heating element heats up, and the heat is transferred to the entire magnetic pole 7 through the heat pipe 8. A fiber spacer 25 is placed between the outer shaft 11 and the inner shaft 1, slowing down the heat exchange between the magnetic teeth and the shaft, increasing the maximum temperature of the magnetic teeth under operating conditions, and simultaneously reducing the volume and energy consumption of the entire heating structure. The porous design of the heat insulation ring 25 reduces heat conduction from the front and rear bearings 15. These three factors together slow down the cooling rate of the magnetic pole 7 and increase the fluidity and sealing effect of the magnetic fluid. Water vapor in device 3 condenses at the water distribution cover 14. Compressed air blown in through the air inlet 28 at the outer shell 16 (the outer shell unit is composed of threaded top cover 17, outer shell 16 and rear top cover 18) flows out of the magnetic fluid seal through the discharge groove 29, thus preventing water vapor in the air from condensing on the hot surface of the magnetic pole 7 and water droplets from falling into the magnetic pole 7 and breaking the vacuum.

[0043] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A self-heating magnetic fluid sealing device, characterized in that, include: A housing unit is fitted onto the outside of the inner shaft, and a storage space is formed between the housing unit and the inner shaft; An outer shaft, which is sleeved on the outside of the inner shaft and located within the storage space; A heating mechanism, which is sleeved on the outside of the outer shaft and located within the storage space; in The heating mechanism includes: A magnetic pole unit, wherein the magnetic pole unit is sleeved on the outside of the outer shaft, and a mounting groove is provided on the magnetic pole unit; A magnet unit, wherein the magnet unit is sleeved on the outside of the outer shaft, and the magnet unit is located at the end of the magnetic pole unit; Heat pipe, which is laid in the mounting groove; A heat pipe cover plate is disposed in the mounting groove and laid on the heat pipe; A cover is provided in the mounting groove and laid on the heat pipe cover plate.

2. The self-heating magnetic fluid sealing device according to claim 1, characterized in that, The magnetic pole unit includes: A magnetic pole mounting base, which is sleeved on the outside of the outer shaft; Magnetic poles, wherein the magnetic poles are disposed on the top of the magnetic pole mounting base.

3. The self-heating magnetic fluid sealing device according to claim 2, characterized in that, The magnet unit includes: A front magnet bracket and a rear magnet bracket are sleeved on the outside of the outer shaft, and the front magnet bracket and the rear magnet bracket are respectively located at both ends of the magnetic pole mounting base; Magnets are disposed on the front magnet bracket and the rear magnet bracket.

4. The self-heating magnetic fluid sealing device according to claim 3, characterized in that, Heat insulation rings are provided at the ends of the front magnet bracket and the rear magnet bracket, respectively.

5. The self-heating magnetic fluid sealing device according to claim 4, characterized in that, A spacer is fitted on the outside of the inner shaft, and the spacer is disposed between the outer shaft and the inner shaft.

6. The self-heating magnetic fluid sealing device according to claim 5, characterized in that, The outer shaft is fixed to the outside of the inner shaft by a ceramic spacer.

7. The self-heating magnetic fluid sealing device according to claim 6, characterized in that, A water distribution unit is also sleeved on the outer side of the inner shaft, the water distribution unit comprising: The water distribution cover has an arc structure, and a water distribution space is formed between the water distribution cover, the outer shell unit, and the heating mechanism; An air inlet is provided on the outer casing unit. The air inlet is a through-hole that connects the outside to the water distribution space. The discharge channel is a through-flow structure that connects the outside world to the water distribution space.

8. The self-heating magnetic fluid sealing device according to claim 7, characterized in that, A magnetic shielding ring is fitted on the outer side of the inner shaft.

9. The self-heating magnetic fluid sealing device according to claim 8, characterized in that, Bearings are provided at both ends inside the storage space.

10. The self-heating magnetic fluid sealing device according to claim 9, characterized in that, A temperature sensor is provided at the bottom of the magnetic pole mounting base.

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