Temperature suppression magnetic medium sealing device

Abstract

The invention provides a temperature suppression magnetic medium sealing device, and relates to the technical field of sealing devices, the temperature suppression magnetic medium sealing device comprises a shell, a rotating shaft and a magnetic sealing assembly, the rotating shaft is pivotally connected with the cavity, and at least one end is located outside the shell; the magnetic sealing assembly is matched with the cavity and comprises a first pole shoe, a permanent magnet and a second pole shoe which are sequentially arranged in the axial direction of the rotating shaft, a sealing gap is defined between each of the first pole shoe and the second pole shoe and the rotating shaft, and a magnetic medium is adsorbed in the sealing gap; at least one of the first pole shoe and the second pole shoe is provided with a heat exchange channel, a phase change medium is arranged in the heat exchange channel, the phase change medium has a first state and a second state, and the phase change medium can be switched between the first state and the second state so as to exchange heat with the magnetic sealing assembly. Temperature rise in the dynamic sealing process of the magnetic medium can be effectively restrained, the heat exchange efficiency is high, loss of the magnetic medium can be reduced, and the sealing pressure resistance and the service life of the magnetic medium are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, in particular to a temperature-suppressed magnetic medium sealing device. Background Art

[0002] The pressure resistance and service life of magnetic media seals are closely related to the viscosity of the magnetic media. When the temperature of the magnetic media rises due to shear heat in dynamic sealing situations, its viscosity will decrease and the volatility will increase, resulting in a decrease in the pressure resistance of the magnetic media. Therefore, the temperature rise of the magnetic media during the dynamic sealing process not only exacerbates the loss of the magnetic media, but also further shortens the service life of the magnetic media seal and may even cause the magnetic media seal to leak and fail.

[0003] In the related art, the temperature rise suppression methods for magnetic medium seals mainly include supplying cooling water and adding heat dissipation fins. However, the cooling water supply method requires an external cooling water tank, while continuously consuming energy and being costly. The method relying solely on fins is effective in suppressing temperature. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a temperature-suppressed magnetic medium sealing device, which can effectively suppress the temperature rise of the magnetic medium during the dynamic sealing process, has high heat exchange efficiency, reduces magnetic medium loss, and ensures the pressure resistance and service life of the magnetic medium seal.

[0006] According to an embodiment of the present invention, a temperature-suppressed magnetic medium sealing device includes a shell, a rotating shaft and a magnetic sealing assembly, wherein the shell has a chamber; the rotating shaft is pivotally connected to the chamber and at least one end is located outside the shell; the magnetic sealing assembly is matched with the chamber and includes a first pole shoe, a permanent magnet and a second pole shoe arranged in sequence along the axial direction of the rotating shaft, the first pole shoe, the permanent magnet and the second pole shoe all surround the outer circumference of the rotating shaft, each of the first pole shoe and the second pole shoe defines a sealing gap with the rotating shaft, a magnetic medium is adsorbed in the sealing gap, and the magnetic pole direction of the permanent magnet is consistent with the axial direction of the rotating shaft; at least one of the first pole shoe and the second pole shoe is provided with a heat exchange channel, a phase change medium is provided in the heat exchange channel, the phase change medium has a first state and a second state, and the phase change medium can be converted between the first state and the second state to exchange heat with the magnetic sealing assembly.

[0007] According to the temperature-suppressing magnetic medium sealing device of the embodiment of the present invention, a magnetic medium dynamic sealing structure is formed by the cooperation of a shell, a rotating shaft and a magnetic sealing assembly. During the rotation of the rotating shaft, the magnetic medium generates heat due to friction caused by shearing action. Since a heat exchange channel is provided on the first pole shoe or the second pole shoe, the heat generated by the magnetic medium will be directly conducted to the heat exchange channel through the corresponding pole shoe, thereby greatly shortening the heat conduction path and improving the heat dissipation speed. The phase change medium in the heat exchange channel absorbs heat and undergoes phase change, that is, the phase change medium is converted from a first state to a second state, so as to realize enhanced heat exchange of the magnetic sealing assembly based on the phase change principle, thereby eliminating the need for external water cooling equipment to dissipate heat from the magnetic medium sealing device, simplifying the heat dissipation structure and reducing energy consumption. At the same time, compared with the method of relying solely on the provision of fins for heat dissipation, the phase change heat dissipation method is also more efficient. Therefore, compared with the related art, the present invention can effectively suppress the temperature rise during the dynamic sealing process of the magnetic medium, has high heat exchange efficiency, can reduce magnetic medium loss, and ensure the pressure resistance and service life of the magnetic medium seal.

[0008] In some embodiments, the housing includes a shell and an end cover sleeved on the rotating shaft, wherein the shell and the end cover are connected along the axial direction of the rotating shaft and together define the chamber;

[0009] The sealing device further comprises a first sealing member. The first sealing member is provided at one end of the housing away from the end cover. The first sealing member is adapted to seal a connection gap between the housing and the sealed equipment.

[0010] In some embodiments, at least a portion of the heat exchange channel is disposed adjacent to the sealing gap.

[0011] In some embodiments, the rotating shaft has a magnetic conductive portion, the permanent magnets are arranged at intervals on the outer periphery of the magnetic conductive portion, and the magnetic conductive portion is located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft;

[0012] The sealing gap is defined between the two opposite end surfaces of the magnetic conductive portion along the axial direction of the rotating shaft and the first pole shoe and the second pole shoe respectively.

[0013] In some embodiments, at least one of the first pole shoe and the second pole shoe is provided with a pole tooth adjacent to an end surface of the magnetic conductive portion;

[0014] There are a plurality of pole teeth which are spaced apart in the radial direction of the rotating shaft, and the sealing gap is defined between one end of all the pole teeth adjacent to the magnetic conductive portion and the corresponding end surface of the magnetic conductive portion.

[0015] In some embodiments, the rotating shaft includes a shaft body, a sleeve and a sleeve, the shaft body is pivotally connected to the chamber and at least one end is located outside the outer shell; the sleeve is sleeved on the shaft body; the sleeve is sleeved on the sleeve, the first pole shoe, the permanent magnet and the second pole shoe are all spaced apart on the outer peripheral side of the sleeve, and the sleeve is provided with the magnetic conductive part.

[0016] In some embodiments, the sealing device also includes a second seal, a third seal and a fourth seal, the second seal being clamped between the inner circumference of the sleeve and the outer circumference of the shaft body; the third seal being clamped between the inner circumference of the sleeve and the outer circumference of the sleeve; and the fourth seal being clamped between the outer circumference of each of the first pole shoe and the second pole shoe and the inner circumference of the chamber.

[0017] In some embodiments, the heat exchange channel is formed on the outer circumferential surface of the first pole shoe or the outer circumferential surface of the second pole shoe, and the heat exchange channel and the sealing gap are arranged at intervals along the axial direction of the rotating shaft.

[0018] In some embodiments, the heat exchange channel is an annular heat exchange groove; or, the heat exchange channel is a heat exchange hole, which extends from the outer peripheral surface of the first pole shoe or the outer peripheral surface of the second pole shoe toward the rotating shaft. There are multiple heat exchange holes and they are arranged at intervals along the circumference of the rotating shaft.

[0019] In some embodiments, there are at least two magnetic sealing assemblies arranged at intervals along the axial direction of the rotating shaft, and the magnetic poles of the permanent magnets in any two adjacent magnetic sealing assemblies are in opposite directions;

[0020] There are at least two magnetic conductive parts and they correspond one to one with the magnetic sealing components.

[0021] In some embodiments, the sealing device also includes a magnetic isolation ring and a spacer sleeve. The magnetic isolation ring is sleeved on the shaft sleeve, and the two end surfaces of the magnetic isolation ring opposite to each other along the axial direction of the rotating shaft are respectively abutted against any two adjacent sleeves; the spacer sleeve is arranged on the outer peripheral side of the magnetic isolation ring at intervals, and the two end surfaces of the spacer sleeve opposite to each other along the axial direction of the rotating shaft are respectively abutted against any two adjacent magnetic sealing assemblies.

[0022] In some embodiments, the end of the magnetic sealing assembly farthest from the end cover that faces away from the spacer abuts against the inner end surface of the shell, the end cover is provided with an annular shoulder on the end surface adjacent to the chamber, and the end of the magnetic sealing assembly closest to the end cover that faces away from the spacer abuts against the annular shoulder.

[0023] In some embodiments, the sealing device further includes a first retaining spring and a second retaining spring, both of which are sleeved on the shaft sleeve, and the end of the sleeve farthest from the end cover that faces away from the magnetic isolation ring abuts against the first retaining spring, and the end of the sleeve closest to the end cover that faces away from the magnetic isolation ring abuts against the second retaining spring.

[0024] In some embodiments, the sealing device further includes a heat pipe, the heat pipe being fitted to the heat exchange channel and having a receiving cavity for filling the phase change medium, the receiving cavity including an evaporation section and a condensation section connected to each other, the evaporation section and the condensation section being arranged radially along the rotating shaft, the evaporation section being closer to the sealing gap than the condensation section;

[0025] The phase change medium absorbs heat from the magnetic medium in the evaporation section to transform from the first state to the second state, and releases heat to the outside in the condensation section to transform from the second state to the first state.

[0026] In some embodiments, the heat pipe is detachably connected to the heat exchange channel.

[0027] In some embodiments, the sealing device further includes heat dissipation fins, and the heat dissipation fins are provided on the outer peripheral surface of the housing.

[0028] In some embodiments, there are a plurality of heat dissipation fins, which are arranged at intervals along the axial direction of the rotating shaft.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 2 is a schematic structural diagram of a temperature-suppressed magnetic medium sealing device according to an embodiment of the present invention.

[0031] Figure 2 yes Figure 1 Schematic diagram of the locally enlarged structure in .

[0032] Figure 3 3 is a schematic structural diagram of a first pole shoe in a temperature-suppressed magnetic medium sealing device according to an embodiment of the present invention.

[0033] Figure 4 1 is a schematic diagram of a first structure of a heat pipe in a temperature-suppressed magnetic medium sealing device according to an embodiment of the present invention (the heat pipe in the figure is fan-shaped).

[0034] Figure 5 1 is a schematic diagram of a second structure of a heat pipe in a temperature-suppressed magnetic medium sealing device according to an embodiment of the present invention (the heat pipe in the figure is in a rod shape).

[0035] Reference numerals:

[0036] 1. Housing; 11. Chamber; 12. Shell; 121. First mounting hole; 13. End cover; 131. Second mounting hole; 132. Annular shoulder; 14. First sealing member;

[0037] 2. Rotating shaft; 21. Magnetic conductive portion; 22. Shaft; 23. Bushing; 24. Sleeve; 25. Second sealing member; 26. Third sealing member;

[0038] 3. Magnetic sealing assembly; 31. First pole shoe; 32. Permanent magnet; 33. Second pole shoe; 34. Sealing gap; 35. Magnetic medium; 36. Heat exchange channel; 37. Pole teeth; 38. Fourth sealing member;

[0039] 4. Magnetic isolation ring;

[0040] 5. Spacer;

[0041] 6. First retaining spring;

[0042] 7. Second retaining spring;

[0043] 8. Heat pipe; 81. Accommodation cavity; 811. Evaporation section; 812. Condensation section; 82. Shell and tube; 83. Liquid wick;

[0044] 9. Heat sink fins. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0046] like Figures 1 to 3 As shown, a temperature-suppressed magnetic medium sealing device according to an embodiment of the present invention includes a housing 1, a rotating shaft 2 and a magnetic sealing assembly 3, wherein the housing 1 has a chamber 11; the rotating shaft 2 is pivotally connected to the chamber 11 and at least one end is located outside the housing 1; the magnetic sealing assembly 3 is matched with the chamber 11 and includes a first pole shoe 31, a permanent magnet 32 ​​and a second pole shoe 33 arranged in sequence along the axial direction of the rotating shaft 2, the first pole shoe 31, the permanent magnet 32 ​​and the second pole shoe 33 all surround the outer circumference of the rotating shaft 2, and each of the first pole shoe 31 and the second pole shoe 33 defines a sealing gap 34 with the rotating shaft 2, in which a magnetic medium 35 is adsorbed, and the magnetic pole direction of the permanent magnet 32 ​​is consistent with the axial direction of the rotating shaft 2; at least one of the first pole shoe 31 and the second pole shoe 33 is provided with a heat exchange channel 36, in which a phase change medium is provided, and the phase change medium has a first state and a second state, and the phase change medium can be converted between the first state and the second state to exchange heat with the magnetic sealing assembly 3.

[0047] According to an embodiment of the present invention, the temperature-suppressed magnetic medium sealing device comprises a housing 1, a rotating shaft 2, and a magnetic sealing assembly 3, which cooperate to form a dynamic sealing structure for a magnetic medium 35. During the rotation of the rotating shaft 2, the magnetic medium 35 generates heat due to friction caused by shearing. Since a heat exchange channel 36 is provided on the first pole shoe 31 or the second pole shoe 33, the heat generated by the magnetic medium 35 is directly transferred to the heat exchange channel 36 through the corresponding pole shoe, thereby greatly shortening the heat conduction path and improving the heat dissipation rate. In addition, the phase change medium in the heat exchange channel 36 absorbs heat and undergoes a phase change, that is, the phase change medium changes from a first state to a second state, thereby achieving enhanced heat exchange for the magnetic sealing assembly 3 based on the phase change principle. This eliminates the need for external water cooling equipment to dissipate heat from the magnetic medium sealing device, simplifies the heat dissipation structure, and reduces energy consumption. Compared with a method that relies solely on fin heat dissipation, the phase change heat dissipation method is more efficient. Therefore, compared with the related art, the present invention can effectively suppress the temperature rise of the magnetic medium 35 during the dynamic sealing process, has high heat exchange efficiency, reduces the loss of the magnetic medium 35, and ensures the pressure resistance and service life of the magnetic medium seal.

[0048] Specifically, the housing 1 and the chamber 11 can both extend along the axial direction of the rotating shaft 2. The rotating shaft 2 can be pivotally connected to the chamber 1 coaxially. The two opposite ends of the rotating shaft 2 along its axial direction can both be located outside the housing 1; or, any end of the rotating shaft 2 along its axial direction can be located outside the housing 1, such as in the figure, where the two opposite ends of the rotating shaft 2 along its axial direction extend to the outside of the housing 1. The first pole shoe 31 and the second pole shoe 33 are both provided with a heat exchange channel 36; or, the first pole shoe 31 is provided with a heat exchange channel 36; or, the second pole shoe 33 is provided with a heat exchange channel 36, wherein preferably, the first pole shoe 31 and the second pole shoe 33 are both provided with a heat exchange channel 36 to ensure that the magnetic medium 35 between the two and the rotating shaft 2 can quickly dissipate heat, thereby improving the overall heat exchange performance of the magnetic sealing assembly 3.

[0049] The "axial direction of the rotating shaft" can be the vertical direction in the figure. For example, in the figure, the first pole shoe 31, the permanent magnet 32, and the second pole shoe 33 can be arranged in sequence from bottom to top. The first pole shoe 31 and the second pole shoe 33 are each provided with a positioning groove, and the permanent magnet 32 ​​fits within the positioning groove. The first pole shoe 31 and the second pole shoe 33 cooperate to limit the position of the permanent magnet 32 ​​in the vertical direction. The upper end of the lowest permanent magnet 32 ​​can be an N pole, and the lower end can be an S pole.

[0050] It should be noted that the “magnetic medium” is not limited to magnetic media such as magnetic grease, magnetic liquid, and magnetorheological fluid.

[0051] In addition, the "phase change medium" can change from liquid to gas after absorbing heat, that is, the phase change medium is converted from a first state to a second state. Among them, the "phase change medium" is not limited to water, methanol, acetone or ammonia water, etc. Its specific type can be selected according to actual working conditions, that is, considering the ambient temperature and the heat generation efficiency of the magnetic medium.

[0052] like Figure 1 As shown, in some embodiments, the housing 1 includes a shell 12 and an end cover 13 sleeved on the rotating shaft 2 . The shell 12 and the end cover 13 are connected along the axial direction of the rotating shaft 2 and jointly define a chamber 11 .

[0053] The sealing device further includes a first sealing member 14 . The first sealing member 14 is provided at one end of the housing 12 away from the end cover 13 . The first sealing member 14 is suitable for sealing the connection gap between the housing 12 and the sealed equipment.

[0054] It can be understood that the outer shell 1 is formed by the combination of the shell 12 and the end cover 13, which is conducive to the disassembly, assembly and maintenance of the rotating shaft 2 and the magnetic sealing assembly 3 on the outer shell 1, and the first seal 14 can seal the connection gap between the shell 12 and the stator component of the sealed equipment to further ensure the sealing reliability of the sealing device.

[0055] Specifically, the housing 12 may extend axially along the rotating shaft 2. A first mounting hole 121 may be defined on the side of the housing 12 facing away from the end cap 13. The first mounting hole 121 communicates with the chamber 11 and is configured to receive the end of the rotating shaft 2 facing away from the end cap 13. The end cap 13 may also have a second mounting hole 131, which communicates with the chamber 11 and is configured to receive the rotating shaft 2. For example, in the figure, the end cap 13 may be positioned above the housing 12. Both the housing 12 and the end cap 13 may be made of a material with high thermal conductivity and a non-magnetic conductivity.

[0056] like Figures 1 to 3 As shown, in some embodiments, at least a portion of the heat exchange channel 36 is arranged adjacent to the sealing gap 34 to shorten the heat conduction path, so that the heat generated by the magnetic medium 35 in the sealing gap 34 can be quickly transferred to the heat exchange channel 36 for heat exchange, effectively suppressing the impact of temperature rise on the magnetic medium 35 during the dynamic sealing process, reducing the volatilization amount of the magnetic medium 35, and avoiding the problem of sealing leakage failure.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the rotating shaft 2 has a magnetic conductive portion 21 , and the permanent magnets 32 are arranged at intervals on the outer peripheral side of the magnetic conductive portion 21 . The magnetic conductive portion 21 is located between the first pole shoe 31 and the second pole shoe 33 in the axial direction of the rotating shaft 2 .

[0058] The two opposite end surfaces of the magnetic conductive portion 21 along the axial direction of the rotating shaft 2 define a sealing gap 34 with the first pole shoe 31 and the second pole shoe 33 respectively.

[0059] It can be understood that the above-mentioned structural design allows the magnetic lines of force starting from the N pole of the permanent magnet 32 ​​to pass through the second pole shoe 33 (or the first pole shoe 31), the magnetic conductive part 21 and the first pole shoe 31 (or the second pole shoe 33) and then return to the S pole of the permanent magnet 32 ​​to form a closed magnetic circuit, thereby realizing the magnetic sealing of the sealing device on the rotating shaft 2. At the same time, the above-mentioned layout of the magnetic sealing assembly 3 and the magnetic conductive part 21 also increases the difficulty of leakage of the sealed working fluid, further improving the sealing ability of the sealing device.

[0060] Taking the figure as an example, the permanent magnet 32 ​​and the magnetic conductive part 21 are both located between the first pole shoe 31 and the second pole shoe 33 in the upper and lower directions, and the upper and lower end faces (i.e., the upper end face and the lower end face) of the magnetic conductive part 21 can respectively define a sealing gap 34 with the end face of the first pole shoe 31 and the end face of the second pole shoe 33 to form an end face seal, so that the sealed working medium is not easy to leak.

[0061] like Figure 1 and Figure 2 As shown, in some embodiments, at least one of the first pole shoe 31 and the second pole shoe 33 is provided with a pole tooth 37 on an end surface adjacent to the magnetic conductive portion 21 .

[0062] There are multiple pole teeth 37 that are spaced apart in the radial direction of the rotating shaft 2 . A sealing gap 34 is defined between one end of all the pole teeth 37 adjacent to the magnetic conductive portion 21 and the corresponding end surface of the magnetic conductive portion 21 .

[0063] It can be understood that because the pole teeth 37 have the function of heat dissipation fins 9, the pole teeth 37 are designed on the first pole shoe 31 or the second pole shoe 33 instead of the magnetic conductive part 21, which can increase the heat exchange area between the first pole shoe 31 and the magnetic medium 35, or between the second pole shoe 33 and the magnetic medium 35, so as to accelerate the diffusion of heat from the magnetic medium 35 to the heat exchange channel 36 and improve the heat exchange efficiency.

[0064] Specifically, each of the first pole shoe 31 and the second pole shoe 33 is provided with a pole tooth 37 on the end surface adjacent to the magnetic conductive part 21; or, the first pole shoe 31 is provided with a pole tooth 37 on the end surface adjacent to the magnetic conductive part 21; or, the second pole shoe 33 is provided with a pole tooth 37 on the end surface adjacent to the magnetic conductive part 21, wherein preferably, each of the first pole shoe 31 and the second pole shoe 33 is provided with a pole tooth 37 on the end surface adjacent to the magnetic conductive part 21 to further enhance the heat exchange performance of the sealing device.

[0065] In addition, the arrangement of the pole teeth 37 will generate a non-uniform magnetic field. At the same time, due to the edge effect, the magnetic field at the pole teeth 37 is stronger, much stronger than the "radial gap between the pole teeth 37 and the pole teeth 37". Therefore, the magnetic medium 35 is injected between the pole teeth 37 and the end face of the magnetic conductive portion 21. The magnetic medium 35 reaches a balance under the action of the non-uniform magnetic field and the pressure difference to prevent the leakage of the sealed working fluid, thereby achieving a sealing effect.

[0066] Preferably, the plurality of pole teeth 37 are arranged at equal intervals along the radial direction of the rotating shaft 2 to ensure uniform force on all the pole teeth 37 .

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the rotating shaft 2 includes a shaft body 22, a sleeve 23 and a sleeve 24, the shaft body 22 is pivotally connected to the chamber 11 and at least one end is located outside the shell 1; the sleeve 23 is sleeved on the shaft body 22; the sleeve 24 is sleeved on the sleeve 23, the first pole shoe 31, the permanent magnet 32 ​​and the second pole shoe 33 are all spaced apart on the outer peripheral side of the sleeve 24, and the sleeve 24 is provided with a magnetic conductive portion 21.

[0068] It can be understood that the shaft sleeve 23 can protect the shaft body 22, and the sleeve 24 can ensure that it cooperates with the first pole shoe 31, the permanent magnet 32 ​​and the second pole shoe 33 to form a magnetic medium seal, while making the shaft sleeve 23 and the sleeve 24 independent of each other, which is convenient for production and processing, and is conducive to the later disassembly and maintenance of the rotating shaft 2. When any one of the rotating shafts 2 is damaged and fails, the normal operation of the rotating shaft 2 can be achieved by replacing the corresponding damaged parts without scrapping the entire rotating shaft 2, further effectively reducing the maintenance cost of the sealing device.

[0069] Specifically, the sleeve 23 can extend axially along the shaft 2. The sleeve 24 includes a cylindrical portion and a magnetic conductive portion 21 connected to each other. The cylindrical portion is sleeved on the sleeve 23, and the magnetic conductive portion 21 extends from the outer circumference of the cylindrical portion toward the permanent magnet 32. The sleeve 24 can be made entirely of a magnetic conductive material to simplify production, or the magnetic conductive portion 21 in the sleeve 24 can be made of a magnetic conductive material.

[0070] It should be noted that the "rotating shaft" in the present invention may be only the shaft body 22, in which case the magnetic conductive part 21 is arranged on the shaft body 22; or, the "rotating shaft" in the present invention may include the shaft body 22 and the sleeve 23, in which case the magnetic conductive part 21 is arranged on the sleeve 23; or, the "rotating shaft" in the present invention may include the shaft body 22, the sleeve 23 and the sleeve 24, in which case the magnetic conductive part 21 is arranged on the sleeve 24 so as not to destroy the structural integrity of the sleeve 23 and ensure the working performance of the rotating shaft. In addition, when the magnetic conductive part 21 needs to be replaced, replacing the sleeve 24 is more cost-effective than replacing the sleeve 23, and is also easier to implement in operation.

[0071] like Figure 1As shown, in some embodiments, the sealing device also includes a second seal 25, a third seal 26 and a fourth seal 38, the second seal 25 is clamped between the inner circumference of the sleeve 23 and the outer circumference of the shaft body 22 to form a static seal; the third seal 26 is clamped between the inner circumference of the sleeve 24 and the outer circumference of the sleeve 23 to form a static seal; the fourth seal 38 is clamped between the outer circumference of each of the first pole shoe 31 and the second pole shoe 33 and the inner circumference of the chamber 11 to form a static seal.

[0072] Specifically, the inner circumferential surface of the chamber 11 is the inner circumferential surface of the housing 12 that surrounds the chamber 11. To ensure reliable installation of the first seal 14, the second seal 25, the third seal 26, and the fourth seal 38 in the sealing device, groove structures can be provided at the locations where the aforementioned seals are arranged in the sealing device, and the aforementioned seals can be fitted into the grooves. For example, a groove can be provided on the end surface of the housing 12 facing away from the end cover 13 to install the first seal 14, a groove can be provided on the inner circumferential surface of the shaft sleeve 23 to install the second seal 25, a groove can be provided on the inner circumferential surface of the sleeve 24 to install the third seal 26, and a groove can be provided on the outer circumferential surface of each of the first pole shoe 31 and the second pole shoe 33 to install the fourth seal 38.

[0073] Among them, the first seal 14, the second seal 25, the third seal 26 and the fourth seal 38 are not limited to O-rings. Other sealing structures that can play a sealing role are also applicable to the present invention and will not be expanded here.

[0074] like Figures 1 to 3 As shown, in some embodiments, a heat exchange channel 36 is formed on the outer peripheral surface of the first pole shoe 31 or the outer peripheral surface of the second pole shoe 33, and the heat exchange channel 36 and the sealing gap 34 are arranged at intervals along the axial direction of the rotating shaft 2. At this time, there are at least two fourth seals 38, and the two fourth seals 38 are respectively arranged on both sides of the heat exchange channel 36 along the axial direction of the rotating shaft 2 to ensure the sealing reliability between the first pole shoe 31 or the second pole shoe 33 and the inner peripheral surface of the chamber 11.

[0075] It can be understood that the heat exchange channel 36 is opened on the outer peripheral surface of the first pole shoe 31 or the outer peripheral surface of the second pole shoe 33, and is arranged at an axial interval with the sealing gap 34 along the rotating shaft 2. In combination with the above structure, at least part of the heat exchange channel 36 extends to the adjacent sealing gap 34, which can further simplify the production and processing of the heat exchange channel 36 on the first pole shoe 31 or the second pole shoe 33, which is conducive to shortening the heat conduction path and achieving the purpose of quickly conducting the heat generated by the magnetic medium 35 in the sealing gap 34 to the outside of the shell 12 for heat dissipation through the heat exchange channel 36.

[0076] like Figures 1 to 3As shown, in some embodiments, the heat exchange channel 36 is an annular heat exchange groove; or, the heat exchange channel 36 is a heat exchange hole, which extends from the outer peripheral surface of the first pole shoe 31 or the outer peripheral surface of the second pole shoe 33 toward the rotating shaft 2. There are multiple heat exchange holes and they are arranged at intervals along the circumference of the rotating shaft 2.

[0077] It can be understood that the heat exchange channel 36 is designed as an annular structure, which can cover the entire sealing gap 34 in the circumferential direction to achieve good heat exchange for the magnetic medium 35 in the sealing gap 34, and the heat exchange channel 36 adopts a heat exchange hole structure, which is easy to process, and the denser the heat exchange holes are arranged on the first pole shoe 31 or the second pole shoe 33, the better the heat dissipation effect, and the better the effect of suppressing the temperature rise of the magnetic medium seal.

[0078] Specifically, the annular heat exchange groove can be coaxially opened on the first pole shoe 31 or the second pole shoe 33. A plurality of heat exchange holes can be evenly spaced along the circumference of the rotating shaft 2 so that the first pole shoe 31 or the second pole shoe 33 can dissipate heat evenly.

[0079] like Figure 1 As shown, in some embodiments, there are at least two magnetic sealing assemblies 3 that are arranged axially at intervals along the rotating shaft 2, and the magnetic pole directions of the permanent magnets 32 in any two adjacent magnetic sealing assemblies 3 are opposite to ensure the sealing performance of each magnetic sealing assembly 3.

[0080] There are at least two magnetic conductive parts 21 corresponding to the magnetic sealing components 3 , that is, there are at least two sleeves 24 arranged at intervals along the axial direction of the rotating shaft 2 , and at least two sleeves 24 correspond to at least two magnetic sealing components 3 .

[0081] It should be noted that there can be one or at least two magnetic sealing assemblies 3. When there are at least two magnetic sealing assemblies 3, the arrangement of the permanent magnets 32 in the at least two magnetic sealing assemblies 3 is preferably the above-described structure. The specific number of magnetic sealing assemblies 3 can be designed accordingly based on actual operating conditions and other requirements, and will not be elaborated here.

[0082] like Figure 1 As shown, in some embodiments, the sealing device also includes a magnetic isolation ring 4 and a spacer sleeve 5. The magnetic isolation ring 4 is sleeved on the shaft sleeve 23, and the two end surfaces of the magnetic isolation ring 4 along the axial direction of the rotating shaft 2 are respectively abutted against any two adjacent sleeves 24; the spacer sleeve 5 is arranged at intervals on the outer peripheral side of the magnetic isolation ring 4, and the two end surfaces of the spacer sleeve 5 along the axial direction of the rotating shaft 2 are respectively abutted against any two adjacent magnetic sealing components 3, so that the magnetic isolation ring 4 and the spacer sleeve 5 separate the two adjacent magnetic sealing components 3, and the magnetic isolation ring 4 and the spacer sleeve 5 can also position the magnetic sealing component 3 in the axial direction of the rotating shaft 2.

[0083] like Figure 1As shown, in some embodiments, the end of the magnetic sealing assembly 3 farthest from the end cover 13 that faces away from the spacer 5 abuts against the inner end surface of the shell 12, and the end surface of the end cover 13 adjacent to the chamber 11 is provided with an annular boss 132, and the end of the magnetic sealing assembly 3 closest to the end cover 13 that faces away from the spacer 5 abuts against the annular boss 132.

[0084] For example, taking the figure as an example, there are two magnetic sealing components 3 and they are arranged in the up and down directions, wherein the lower end of the first pole shoe 31 in the lower magnetic sealing component 3 abuts against the inner end surface of the shell 12, and the upper end of the second pole shoe 33 in the upper magnetic sealing component 3 abuts against the annular boss 132.

[0085] like Figure 1 As shown, in some embodiments, the sealing device further includes a first retaining spring 6 and a second retaining spring 7, and the first retaining spring 6 and the second retaining spring 7 are both sleeved on the shaft sleeve 23, and the end of the sleeve 24 farthest from the end cover 13 that faces away from the magnetic isolation ring 4 abuts against the first retaining spring 6, and the end of the sleeve 24 closest to the end cover 13 that faces away from the magnetic isolation ring 4 abuts against the second retaining spring 7.

[0086] It can be understood that the inner end surface of the shell 12, the first retaining spring 6, the annular boss 132 and the second retaining spring 7 cooperate to reliably limit the magnetic sealing assembly 3 and the sleeve 24 in the axial direction of the rotating shaft 2 within the chamber 11, thereby limiting the axial sliding of the magnetic sealing assembly 3 and the sleeve 24 in the rotating shaft 2.

[0087] For example, as shown in the figure, there are two sleeves 24 and they are spaced apart in the vertical direction, wherein the lower end of the lower sleeve 24 abuts against the first retaining spring 6 , and the upper end of the upper sleeve 24 abuts against the second retaining spring 7 .

[0088] like Figures 1 to 5 As shown, in some embodiments, the sealing device also includes a heat pipe 8, which is cooperated with the heat exchange channel 36 and has a accommodating cavity 81 for filling the phase change medium. The accommodating cavity 81 includes an evaporation section 811 and a condensation section 812 connected to each other. The evaporation section 811 and the condensation section 812 are arranged radially along the rotating shaft 2. The evaporation section 811 is closer to the sealing gap 34 than the condensation section 812.

[0089] The phase change medium absorbs heat from the magnetic medium 35 in the evaporation section 811 to change from the first state to the second state, and releases heat to the outside in the condensation section 812 to change from the second state to the first state.

[0090] It can be understood that since the heat pipe 8 mainly utilizes the phase change process of the phase change medium evaporating in the evaporation section 811 and condensing in the condensation section 812, that is, utilizing the latent heat of evaporation and condensation of the phase change medium to achieve rapid heat conduction, the present invention adopts a heat pipe 8 structure, which can make the phase change medium absorb the heat of the magnetic sealing component 3 in the evaporation section 811 and undergo phase change evaporation and vaporization, and flow along the accommodating cavity 81 to the condensation section 812. After the phase change medium in the condensation section 812 loses heat, it changes into liquid. The liquid phase change medium is pumped back to the evaporation section 811 by the capillary structure in the heat pipe 8 to continue the next cooling cycle of the magnetic sealing component 3. Therefore, the use of the heat pipe 8 structure can enhance the heat exchange of the magnetic medium 35 by phase change heat transfer. The overall structure is simple and the feasibility is strong. It overcomes the problem that the shear heat generated by the magnetic medium 35 in the magnetic medium seal causes the magnetic medium seal temperature to rise, causing the viscosity of the magnetic medium 35 to decrease, resulting in a decrease in the pressure resistance of the magnetic medium seal or even failure.

[0091] Specifically, when the heat exchange channel 36 is an annular heat exchange groove, the heat pipe 8 can be fan-shaped, circumferentially covering the entire sealing gap 34. In this case, the smaller radius side of the fan-shaped heat pipe 8 near the magnetic medium 35 serves as the evaporation section 811 of the heat pipe 8, while the larger radius side near the housing 12 serves as the condensation section 812 of the heat pipe 8. When the heat exchange channel 36 is a heat exchange hole, the heat pipe 8 can be rod-shaped, with the end of the rod-shaped heat pipe 8 near the magnetic medium 35 serving as the evaporation section 811 of the heat pipe 8, and the end near the housing 12 serving as the condensation section 812 of the heat pipe 8. The first state of the phase change medium can be liquid, and the second state of the phase change medium can be gaseous.

[0092] It should be noted that the thermal conductivity of the heat pipe 8 exceeds that of known metals, and its specific structure and working principle can adopt existing technologies. For example, the heat pipe 8 generally includes a tube shell 82 and a liquid wick 83. The interior of the heat pipe 8 (i.e., the accommodating chamber 81) is usually evacuated to a negative pressure state and filled with an appropriate phase change medium (generally a liquid phase change material, or liquid). The phase change medium has a low boiling point and is easy to evaporate. A liquid wick 83 is provided between the accommodating chamber 81 and the inner tube wall of the tube shell 82. The liquid wick 83 is made of a capillary porous material. When the evaporation section 811 is heated, the liquid in the capillary tube evaporates rapidly, and the vapor flows to the condensation section 812 under a small pressure difference, releasing heat and re-condensing into liquid. The liquid then flows back to the evaporation section 811 along the porous material under the action of capillary force. This cycle continues, and heat is transferred from the evaporation section 811 to the condensation section 812. This cycle is carried out quickly, so the heat can be continuously conducted.

[0093] like Figures 1 to 3As shown, in some embodiments, the heat pipe 8 is detachably connected to the heat exchange channel 36 to facilitate the later disassembly and maintenance of the heat pipe 8. At the same time, when one of the two connected parts is damaged and fails, it is only necessary to replace the corresponding damaged part to achieve the normal operation of the sealing device without scrapping the entire sealing device, further effectively reducing the maintenance cost of the sealing device.

[0094] like Figure 1 As shown, in some embodiments, the sealing device further includes heat dissipation fins 9 , which are provided on the outer peripheral surface of the housing 1 .

[0095] It can be understood that the heat dissipation fin 9 structure has a larger heat dissipation area compared to the smooth surface of the shell 1. Combined with the above structure, since the heat exchange channel 36 is opened on the outer peripheral surface of the first pole shoe 31 or the second pole shoe 33, after the heat pipe 8 is installed in the heat exchange channel 36, the condensation section 812 of the heat pipe 8 can be in contact with the inner peripheral surface of the chamber 11 (that is, the inner peripheral surface of the shell 12), thereby accelerating the cooling efficiency of the condensation section 812 of the heat pipe 8, dissipating heat faster, and further enhancing the heat exchange effect of the present invention.

[0096] Specifically, the heat dissipation fins 9 may be formed on the outer peripheral surface of the housing 12 by processing methods such as casting, machining, welding and 3D printing, and a suitable processing method may be selected according to actual working conditions.

[0097] like Figure 1 As shown, in some embodiments, there are multiple heat dissipation fins 9 and they are arranged at intervals along the axial direction of the rotating shaft 2. Preferably, the multiple heat dissipation fins 9 are arranged at equal intervals along the axial direction of the rotating shaft 2 to ensure uniform heat dissipation.

[0098] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0099] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0100] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0101] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0102] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A temperature-suppressed magnetic medium sealing device, characterized in that: include: a housing having a chamber; a rotating shaft, the rotating shaft being pivotally connected to the chamber and having at least one end located outside the housing; a magnetic sealing assembly, the magnetic sealing assembly being fitted into the chamber and comprising a first pole shoe, a permanent magnet, and a second pole shoe arranged in sequence along the axial direction of the rotating shaft, the first pole shoe, the permanent magnet, and the second pole shoe all surrounding the outer circumference of the rotating shaft, a sealed gap being defined between each of the first pole shoe and the second pole shoe and the rotating shaft, a magnetic medium being adsorbed within the sealed gap, and a magnetic pole direction of the permanent magnet being aligned with the axial direction of the rotating shaft; At least one of the first pole shoe and the second pole shoe is provided with a heat exchange channel, in which a phase change medium is provided. The phase change medium has a first state and a second state, and the phase change medium can be converted between the first state and the second state to exchange heat with the magnetic sealing assembly.

2. The temperature-suppressed magnetic medium sealing device according to claim 1, characterized in that: At least a portion of the heat exchange channel is disposed adjacent to the sealing gap.

3. The temperature-suppressed magnetic medium sealing device according to claim 1, characterized in that: The rotating shaft has a magnetic conductive portion, the permanent magnets are arranged at intervals on the outer circumference of the magnetic conductive portion, and the magnetic conductive portion is located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft; The sealing gap is defined between the two opposite end surfaces of the magnetic conductive portion along the axial direction of the rotating shaft and the first pole shoe and the second pole shoe respectively.

4. The temperature-suppressed magnetic medium sealing device according to claim 3, characterized in that: At least one of the first pole shoe and the second pole shoe is provided with a pole tooth on an end surface adjacent to the magnetic conductive portion; There are a plurality of pole teeth which are spaced apart in the radial direction of the rotating shaft, and the sealing gap is defined between one end of all the pole teeth adjacent to the magnetic conductive portion and the corresponding end surface of the magnetic conductive portion.

5. The temperature-suppressed magnetic medium sealing device according to claim 3, characterized in that: The heat exchange channel is formed on the outer circumferential surface of the first pole shoe or the outer circumferential surface of the second pole shoe, and the heat exchange channel and the sealing gap are arranged at intervals along the axial direction of the rotating shaft.

6. The temperature-suppressed magnetic medium sealing device according to claim 5, characterized in that: The heat exchange channel is an annular heat exchange groove; or, The heat exchange channel is a heat exchange hole, which extends from the outer circumferential surface of the first pole shoe or the outer circumferential surface of the second pole shoe toward the rotating shaft. There are multiple heat exchange holes and they are arranged at intervals along the circumference of the rotating shaft.

7. The temperature-suppressed magnetic medium sealing device according to claim 3, characterized in that: There are at least two magnetic sealing assemblies arranged at intervals along the axial direction of the rotating shaft, and the magnetic poles of the permanent magnets in any two adjacent magnetic sealing assemblies are in opposite directions; There are at least two magnetic conductive parts and they correspond one to one with the magnetic sealing components.

8. The temperature-suppressed magnetic medium sealing device according to claim 1, characterized in that: The heat pipe is further comprised, the heat pipe being fitted into the heat exchange channel and having a receiving cavity for filling the phase change medium, the receiving cavity including an evaporation section and a condensation section connected to each other, the evaporation section and the condensation section being arranged radially along the rotating shaft, the evaporation section being closer to the sealing gap than the condensation section; The phase change medium absorbs heat from the magnetic medium in the evaporation section to transform from the first state to the second state, and releases heat to the outside in the condensation section to transform from the second state to the first state.

9. The temperature-suppressed magnetic medium sealing device according to claim 1, characterized in that: It also includes heat dissipation fins, which are arranged on the outer peripheral surface of the shell.

10. The temperature-suppressed magnetic medium sealing device according to claim 9, characterized in that: There are a plurality of heat dissipation fins which are arranged at intervals along the axial direction of the rotating shaft.

Images