Magnetic medium sealing device

Abstract

The invention provides a magnetic medium sealing device, and relates to the technical field of sealing devices.The magnetic medium sealing device comprises a shell, a rotating shaft and a magnetic sealing assembly, and the shell is provided with a cavity and a heat exchange channel; the rotating shaft is pivotally connected with the cavity, and at least one end of the rotating shaft is located outside the shell; the magnetic sealing assembly is matched with the cavity and arranged on the rotating shaft in a sleeving mode, a sealing gap is defined between the magnetic sealing assembly and the cavity, and a magnetic medium is adsorbed in the sealing gap; and the heat exchange channels are arranged on the peripheral side of the cavity at intervals, phase change media are arranged in the heat exchange channels, the phase change media have a first state and a second state, and the phase change media can be switched between the first state and the second state so as to exchange heat with the magnetic sealing assembly. According to the sealing device, enhanced heat exchange of the magnetic medium can be achieved, the heat dissipation effect is good, and the sealable working speed range and temperature range of the sealing device are improved.

Description

Technical Field

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

[0002] Magnetic media sealing technology, which uses a non-uniform magnetic field to constrain the magnetic medium and prevent leakage, offers the advantage of "zero leakage" compared to traditional seals. However, at high linear speeds, the high-speed shearing of the magnetic medium generates viscous frictional heat. Simultaneously, the operation of the bearing assembly also generates frictional heating. These dual heat sources can easily cause a decrease in the viscosity of the magnetic medium, leading to a decrease in the pressure resistance of the magnetic media seal and even leakage failure.

[0003] In order to reduce the impact of temperature rise on the pressure resistance and life of magnetic medium seals in related technologies, magnetic medium sealing devices are usually connected to external water cooling equipment or fins are set to achieve heat dissipation. However, the heat exchange effect of the above two heat dissipation methods is limited, which restricts the application of magnetic medium sealing devices under high linear speed conditions. 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 provides a magnetic medium sealing device, which can achieve enhanced heat exchange for the magnetic medium, has good heat dissipation effect, and increases the sealing working speed range and temperature range of the sealing device.

[0006] According to an embodiment of the present invention, a magnetic medium sealing device includes a shell, a rotating shaft and a magnetic sealing assembly, wherein the shell has a chamber and is provided with a heat exchange channel; 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 is sleeved on the rotating shaft, and a sealing gap is defined between the magnetic sealing assembly and the chamber, and magnetic medium is adsorbed in the sealing gap; the heat exchange channel is arranged at intervals on the outer peripheral side of the chamber, and 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 magnetic medium sealing device of the embodiment of the present invention, a magnetic medium sealing structure is formed by the cooperation of a shell, a rotating shaft and a magnetic sealing component, wherein a part of the heat generated by the magnetic sealing component during the sealing operation can be conducted to the external environment through the shell for dissipation, while another part of the heat can be transferred along the shell to the heat exchange channel on the shell, and 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 component 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 method, and reducing energy consumption. At the same time, compared with the method of relying solely on the setting 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 realize enhanced heat exchange of the magnetic medium, has good heat dissipation effect, and improves the working speed range and temperature range that the sealing device can seal.

[0008] In some embodiments, the sealing device further includes a bearing assembly, which is fitted in the chamber and sleeved on the rotating shaft. The bearing assembly and the magnetic sealing assembly are arranged axially along the rotating shaft, and the phase change medium is capable of switching between the first state and the second state to exchange heat with the bearing assembly.

[0009] In some embodiments, the sealing device further includes a heat pipe, 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 along the axial direction of the rotating shaft, the evaporation section being closer to the magnetic sealing assembly than the condensation section;

[0010] The phase change medium absorbs heat from the magnetic sealing assembly 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.

[0011] In some embodiments, the heat pipe is detachably connected to the heat exchange channel.

[0012] In some embodiments, the heat pipe is slidably connected to the heat exchange channel along the axial direction of the rotating shaft;

[0013] The shell is also provided with a disassembly hole, which is arranged and connected with the heat exchange channel along the axial direction of the rotating shaft. The disassembly hole is suitable for cooperating with at least part of the thread of the disassembly tool so that the heat pipe can be ejected along the axial direction of the rotating shaft by the disassembly tool.

[0014] In some embodiments, there are multiple heat exchange channels and they are arranged at intervals along the circumference of the rotating shaft, there are multiple heat pipes and they correspond one-to-one with the heat exchange channels, and there are multiple disassembly holes and they correspond one-to-one with the heat exchange channels.

[0015] In some embodiments, the sealing device further comprises heat dissipation fins, the heat dissipation fins being provided on a side of the outer peripheral surface of the housing away from the evaporation section, and the heat dissipation fins and the condensation section being arranged radially along the rotating shaft;

[0016] There are a plurality of heat dissipation fins which are arranged at intervals along the axial direction of the rotating shaft.

[0017] In some embodiments, the sealing device further includes an impeller, which is sleeved on the rotating shaft and located outside the housing. The rotating shaft can drive the impeller to rotate so that the housing can perform convective heat exchange under the action of airflow.

[0018] In some embodiments, the housing includes a shell and an end cover sleeved on the rotating shaft, the shell and the end cover are connected along the axial direction of the rotating shaft and jointly define the chamber, and the shell is provided with the heat exchange channel;

[0019] The sealing device further comprises a first sealing member, which is provided on a side of the housing facing away from the end cover. The first sealing member is suitable for sealing a connection gap between the housing and the sealed equipment.

[0020] In some embodiments, the ratio between the thermal conductivity of the housing and the thermal conductivity of the heat pipe shell is i, and i is 0.5 to 2;

[0021] The shell is made of magnetic conductive material.

[0022] In some embodiments, the rotating shaft is provided with a shaft shoulder, and the sealing device further comprises a shaft sleeve and a first retaining spring, wherein the shaft sleeve and the first retaining spring are both sleeved on the rotating shaft, the shaft sleeve abuts against the shaft shoulder, and an end of the shaft sleeve facing away from the shaft shoulder abuts against the first retaining spring;

[0023] The magnetic sealing component is sleeved on the shaft sleeve.

[0024] In some embodiments, the magnetic seal assembly includes a first pole piece, a permanent magnet, a second pole piece, and a second seal.

[0025] The first pole shoe, the permanent magnet, and the second pole shoe are sequentially arranged along the axial direction of the rotating shaft, and the sealing gap is defined between the pole teeth of each of the first pole shoe and the second pole shoe and the inner circumferential surface of the chamber;

[0026] Wherein, the second sealing member is sandwiched between the inner circumferential surface of each of the first pole shoe and the second pole shoe and the outer circumferential surface of the rotating shaft.

[0027] In some embodiments, the bearing assembly is sleeved on the shaft sleeve and includes a first bearing and a second bearing, the first bearing is located on a side of the first pole shoe facing away from the permanent magnet, and the second bearing is located on a side of the second pole shoe facing away from the permanent magnet;

[0028] The sealing device also includes a first magnetic isolation ring and a second magnetic isolation ring. The first magnetic isolation ring and the second magnetic isolation ring are both fitted in the chamber and sleeved on the shaft sleeve. The two end surfaces of the first magnetic isolation ring opposite to each other along the axial direction of the rotating shaft are respectively in contact with the first bearing and the first pole shoe. The two end surfaces of the second magnetic isolation ring opposite to each other along the axial direction of the rotating shaft are respectively in contact with the second bearing and the second pole shoe.

[0029] In some embodiments, the inner circumferential surface of the shell is provided with a first annular shoulder, and the end surface of the end cover adjacent to the chamber is provided with a second annular shoulder;

[0030] The sealing device also includes a first spacer and a second spacer, both of which are fitted in the chamber and spaced apart on the outer circumference of the sleeve, the first spacer having opposite end faces along the axial direction of the rotating shaft respectively abutting against the first annular boss and the first bearing, and the second spacer having opposite end faces along the axial direction of the rotating shaft respectively abutting against the second annular boss and the second bearing.

[0031] In some embodiments, the sealing device also includes a second retaining spring and a third retaining spring, and the second retaining spring and the third retaining spring are both mounted on the shaft sleeve, and the end of the first bearing facing away from the first magnetic isolation ring abuts against the second retaining spring, and the end of the second bearing facing away from the second magnetic isolation ring abuts against the third retaining spring.

[0032] 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

[0033] Figure 1 2 is a schematic structural diagram of a magnetic medium sealing device according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 Schematic diagram of the locally enlarged structure at point A in the middle.

[0035] Figure 3 Schematic diagram of the connection structure between the housing and the heat dissipation fins in the magnetic medium sealing device according to an embodiment of the present invention.

[0036] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at BB in the middle.

[0037] Figure 5 3 is a schematic cross-sectional structural diagram of a heat pipe in a magnetic medium sealing device according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1. Housing; 11. Chamber; 12. Heat exchange channel; 13. Shell; 131. First mounting hole; 132. First annular boss; 14. End cover; 141. Second mounting hole; 142. Second annular boss; 15. First sealing member; 16. Disassembly hole;

[0040] 2. Rotating shaft; 21. Shaft shoulder; 22. Shaft sleeve; 23. First retaining ring; 24. Third sealing element;

[0041] 3. Magnetic sealing assembly; 31. Sealing gap; 32. Magnetic medium; 33. First pole shoe; 34. Permanent magnet; 35. Second pole shoe; 36. Second sealing member;

[0042] 4. Bearing assembly; 41. First bearing; 42. Second bearing; 43. First magnetic isolation ring; 44. Second magnetic isolation ring; 45. First spacer; 46. Second spacer; 47. Second retaining spring; 48. Third retaining spring;

[0043] 5. Heat pipe; 51. Accommodation cavity; 511. Evaporation section; 512. Condensation section; 52. Shell and tube; 53. Liquid wick;

[0044] 6. Heat dissipation fins;

[0045] 7. Impeller. DETAILED DESCRIPTION

[0046] 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.

[0047] like Figures 1 to 4 As shown, a magnetic medium sealing device of an embodiment of the present invention includes a shell 1, a rotating shaft 2 and a magnetic sealing assembly 3, the shell 1 has a chamber 11 and is provided with a heat exchange channel 12; the rotating shaft 2 is pivotally connected to the chamber 11 and at least one end is located outside the shell 1; the magnetic sealing assembly 3 is matched with the chamber 11 and is sleeved on the rotating shaft 2, and a sealing gap 31 is defined between the magnetic sealing assembly 3 and the chamber 11, and a magnetic medium 32 is adsorbed in the sealing gap 31; the heat exchange channel 12 is arranged at intervals on the outer peripheral side of the chamber 11, and a phase change medium is provided in the heat exchange channel 12, 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.

[0048] According to the magnetic medium sealing device of the embodiment of the present invention, a magnetic medium sealing structure is formed by the cooperation of the shell 1, the rotating shaft 2 and the magnetic sealing component 3, wherein a part of the heat generated by the magnetic sealing component 3 during the sealing operation can be conducted to the external environment through the shell 1 for dissipation, while the other part of the heat can be thermally transferred along the shell 1 to the heat exchange channel 12 on the shell 1, and the phase change medium in the heat exchange channel 12 absorbs heat and undergoes phase change, that is, the phase change medium is converted from the first state to the second state, so as to realize enhanced heat exchange of the magnetic sealing component 3 based on the phase change principle, thereby eliminating the need for external water cooling equipment to dissipate heat for the magnetic medium sealing device, simplifying the heat dissipation method, and reducing energy consumption. At the same time, compared with the method of relying solely on the setting of fins for heat dissipation, the phase change heat dissipation method is also more efficient. Therefore, compared with the related technology, the present invention can realize enhanced heat exchange of the magnetic medium 32, has good heat dissipation effect, and improves the working speed range and temperature range that the sealing device can seal.

[0049] Specifically, both the shell 1 and the chamber 11 may extend along the axial direction of the rotating shaft 2. The heat exchange channel 12 may be located between the inner circumference of the chamber 11 and the outer circumference of the shell 1 in the radial direction of the rotating shaft 2, wherein the inner circumference of the chamber 11 is the inner circumference of the shell 1 used to surround the chamber 11. The heat exchange channel 12 may extend along the axial direction of the rotating shaft 2. The rotating shaft 2 may be pivotally connected to the chamber 11 coaxially. Both ends of the rotating shaft 2 along its axial direction may be located outside the shell 1, or either end of the rotating shaft 2 along its axial direction may be located outside the shell 1. For example, in the figure, both ends of the rotating shaft 2 along its axial direction extend to the outside of the shell 1.

[0050] It should be noted that the “magnetic medium 32 ” 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 32.

[0052] like Figures 1 to 4 As shown, in some embodiments, the housing 1 includes a shell 13 and an end cover 14 that are sleeved on the rotating shaft 2. The shell 13 and the end cover 14 are connected along the axial direction of the rotating shaft 2 and jointly define a chamber 11. The shell 13 is provided with a heat exchange channel 12.

[0053] The sealing device further includes a first sealing member 15 . The first sealing member 15 is provided on the side of the housing 13 facing away from the end cover 14 . The first sealing member 15 is suitable for sealing the connection gap between the housing 13 and the sealed equipment.

[0054] It can be understood that the outer shell 1 is formed by the combination of the shell 13 and the end cover 14, 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 15 can seal the connection gap between the shell 13 and the stator component of the sealed equipment to further ensure the sealing reliability of the sealing device.

[0055] Specifically, the housing 13 may extend axially along the rotating shaft 2. A first mounting hole 131 may be defined on the side of the housing 13 facing away from the end cap 14. The first mounting hole 131 communicates with the chamber 11 and is configured to receive the end of the rotating shaft 2 facing away from the end cap 14. The end cap 14 may also have a second mounting hole 141, which communicates with the chamber 11 and is configured to receive the rotating shaft 2.

[0056] like Figure 1 and Figure 2 As shown, in some embodiments, the magnetic seal assembly 3 includes a first pole piece 33 , a permanent magnet 34 , a second pole piece 35 and a second seal 36 .

[0057] The first pole shoe 33 , the permanent magnet 34 and the second pole shoe 35 are sequentially arranged along the axial direction of the rotating shaft 2 , and a sealed gap 31 is defined between the pole teeth of each of the first pole shoe 33 and the second pole shoe 35 and the inner circumferential surface of the chamber 11 .

[0058] Among them, a second seal 36 is sandwiched between the inner circumference of each of the first pole shoe 33 and the second pole shoe 35 and the outer circumference of the rotating shaft 2, so that the second seal 36 forms a seal between the first pole shoe 33 and the rotating shaft 2, or between the second pole shoe 35 and the rotating shaft 2.

[0059] Specifically, the outer circumference of each of the first pole shoe 33 and the second pole shoe 35 is provided with pole teeth. There are multiple pole teeth and they are arranged at intervals along the axial direction of the rotating shaft 2. The arrangement of the pole teeth will generate a non-uniform magnetic field. At the same time, due to the edge effect, the magnetic field at the pole teeth is stronger, much stronger than the "axial gap between the pole teeth". Therefore, the magnetic medium 32 is injected between the pole teeth and the inner circumference of the chamber 11. The magnetic medium 32 reaches equilibrium under the action of the non-uniform magnetic field and the pressure difference to prevent the sealed working medium from leaking, thereby achieving a sealing effect.

[0060] like Figure 1 As shown, in some embodiments, the rotating shaft 2 is provided with a shaft shoulder 21, and the sealing device further includes a shaft sleeve 22 and a first retaining spring 23. The shaft sleeve 22 and the first retaining spring 23 are both sleeved on the rotating shaft 2, and the shaft sleeve 22 abuts against the shaft shoulder 21, and the end of the shaft sleeve 22 facing away from the shaft shoulder 21 abuts against the first retaining spring 23.

[0061] The magnetic sealing assembly 3 is sleeved on the shaft sleeve 22 .

[0062] It can be understood that the shaft sleeve 22 can protect the rotating shaft 2, and the shoulder 21 on the rotating shaft 2 cooperates with the first retaining spring 23 to limit the shaft sleeve 22 on the rotating shaft 2, thereby limiting the axial sliding of the shaft sleeve 22 along the rotating shaft 2.

[0063] Specifically, the sleeve 22 may extend axially along the shaft 2. A third seal 24 may be interposed between the inner circumference of the sleeve 22 and the outer circumference of the shaft 2 to form a seal therebetween. The first pole piece 33, the permanent magnet 34, and the second pole piece 35 are all sleeved on the sleeve 22. A second seal 36 is interposed between the inner circumference of each of the first pole piece 33 and the second pole piece 35 and the outer circumference of the sleeve 22.

[0064] In addition, in order to achieve reliable installation of the first seal 15, the second seal 36 and the third seal 24 in the sealing device, a groove structure can be opened at the position where the above-mentioned seals are arranged in the sealing device, and the above-mentioned seals can be fitted in the groove, such as opening a groove on the end surface of the shell 13 away from the end cover 14 to install the first seal 15, opening a groove on the inner circumference of each of the first pole shoe 33 and the second pole shoe 35 to install the second seal 36, and opening a groove on the inner circumference of the sleeve 22 to install the third seal 24.

[0065] The first sealing member 15 , the second sealing member 36 and the third sealing member 24 are not limited to O-rings. Other sealing structures capable of sealing are also applicable to the present invention, which will not be further expanded upon here.

[0066] like Figure 1 As shown, and in combination with the above structural design, in some embodiments, the sealing device also includes a bearing assembly 4, the bearing assembly 4 is matched with the chamber 11 and is sleeved on the shaft sleeve 22, the bearing assembly 4 and the magnetic sealing assembly 3 are arranged along the axial direction of the rotating shaft 2, and the phase change medium can be converted between the first state and the second state to exchange heat with the bearing assembly 4.

[0067] It can be understood that under high linear speed conditions, the magnetic medium 32 generates viscous friction heat due to high-speed shearing, and at the same time, the bearing assembly 4 generates frictional heat during operation. That is, when both the magnetic sealing assembly 3 and the bearing assembly 4 generate heat during the sealing process, the phase change medium can simultaneously achieve enhanced heat exchange for both, so as to effectively avoid the influence of the dual heat sources on the viscosity of the magnetic medium 32, ensure the sealing pressure resistance and service life of the magnetic medium 32, and effectively solve the problem of sealing failure caused by temperature rise of the high linear speed magnetic medium seal.

[0068] like Figure 1As shown, in some embodiments, the bearing assembly 4 includes a first bearing 41 and a second bearing 42. The first bearing 41 and the second bearing 42 are both mounted on the sleeve 22. The first bearing 41 is located on the side of the first pole shoe 33 facing away from the permanent magnet 34, and the second bearing 42 is located on the side of the second pole shoe 35 facing away from the permanent magnet 34.

[0069] The sealing device also includes a first magnetic isolation ring 43 and a second magnetic isolation ring 44. The first magnetic isolation ring 43 and the second magnetic isolation ring 44 are both fitted in the chamber 11 and sleeved on the shaft sleeve 22. The two end surfaces of the first magnetic isolation ring 43 opposite to each other along the axial direction of the rotating shaft 2 are respectively in contact with the first bearing 41 and the first pole shoe 33. The two end surfaces of the second magnetic isolation ring 44 opposite to each other along the axial direction of the rotating shaft 2 are respectively in contact with the second bearing 42 and the second pole shoe 35.

[0070] like Figure 1 As shown, in some embodiments, the inner circumferential surface of the housing 13 is provided with a first annular shoulder 132 , and the end surface of the end cover 14 adjacent to the chamber 11 is provided with a second annular shoulder 142 .

[0071] The sealing device also includes a first spacer 45 and a second spacer 46. The first spacer 45 and the second spacer 46 are both fitted in the chamber 11 and are spaced apart on the outer peripheral side of the sleeve 22. The two end surfaces of the first spacer 45 opposite to each other along the axial direction of the rotating shaft 2 respectively abut against the first annular boss 132 and the first bearing 41, and the two end surfaces of the second spacer 46 opposite to each other along the axial direction of the rotating shaft 2 respectively abut against the second annular boss 142 and the second bearing 42.

[0072] It can be understood that the first annular boss 132, the first spacer 45 and the first magnetic isolation ring 43 cooperate to limit the first bearing 41 on the sleeve 22 to prevent it from slipping axially along the rotating shaft 2, while the second annular boss 142, the second spacer 46 and the second magnetic isolation ring 44 cooperate to limit the second bearing 42 on the sleeve 22 to prevent it from slipping axially along the rotating shaft 2.

[0073] like Figure 1 As shown, in some embodiments, the sealing device also includes a second retaining spring 47 and a third retaining spring 48, and the second retaining spring 47 and the third retaining spring 48 are both mounted on the sleeve 22, and the end of the first bearing 41 facing away from the first magnetic isolation ring 43 abuts against the second retaining spring 47, and the end of the second bearing 42 facing away from the second magnetic isolation ring 44 abuts against the third retaining spring 48, so as to further ensure the installation reliability of the first bearing 41 and the second bearing 42 on the rotating shaft 2 and prevent them from moving along the axial direction of the rotating shaft 2.

[0074] like Figures 1 to 5As shown, in some embodiments, the sealing device also includes a heat pipe 5, which is cooperated with the heat exchange channel 12 and has a accommodating cavity 51 for filling the phase change medium. The accommodating cavity 51 includes an evaporation section 511 and a condensation section 512 connected to each other. The evaporation section 511 and the condensation section 512 are arranged along the axial direction of the rotating shaft 2. The evaporation section 511 is closer to the magnetic sealing assembly 3 than the condensation section 512.

[0075] The phase change medium absorbs heat from the magnetic sealing component 3 in the evaporation section 511 to change from the first state to the second state, and releases heat to the outside in the condensation section 512 to change from the second state to the first state.

[0076] It can be understood that since the heat pipe 5 mainly utilizes the phase change process of the phase change medium evaporating in the evaporation section 511 and condensing in the condensation section 512, 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 5 structure, which can make the phase change medium absorb the heat of the magnetic sealing component 3 in the evaporation section 511, undergo phase change evaporation and vaporization, and flow along the accommodating cavity 51 to the condensation section 512. After the phase change medium in the condensation section 512 loses heat, it changes into liquid. The liquid phase change medium is pumped back to the evaporation section 511 by the capillary structure in the heat pipe 5 to continue the next cooling cycle of the magnetic sealing component 3. Therefore, the use of the heat pipe 5 structure can enhance the heat exchange of the magnetic medium 32 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 32 in the high-speed magnetic medium seal causes the magnetic medium seal temperature to rise, causing the viscosity of the magnetic medium 32 to decrease, resulting in a decrease in the pressure resistance of the magnetic medium seal or even failure.

[0077] Specifically, the heat pipe 5 may extend along the axial direction of the rotating shaft 2. The first state of the phase change medium may be a liquid state, and the second state of the phase change medium may be a gas state.

[0078] In addition, combined with the above-mentioned structural design, in order to simultaneously achieve enhanced heat exchange of the magnetic sealing assembly 3 and the bearing assembly 4, so as to overcome the influence of shear heat generated by the magnetic medium 32 in the high-speed magnetic medium seal and friction heat generated by the bearing on the increase in the temperature of the magnetic medium seal, along the axial direction of the rotating shaft 2, the evaporation section 511 of the heat pipe 5 can extend at least to the outer peripheral side of the edge of the bearing assembly 4 away from the magnetic sealing assembly 3. For example, taking the figure as an example, the evaporation section 511 of the heat pipe 5 is located on the outer peripheral side corresponding to the first bearing 41, the first magnetic isolation ring 43, the magnetic sealing assembly 3, the second magnetic isolation ring 44 and the second bearing 42. In other words, one of the two corresponding ends of the evaporation section 511 of the heat pipe 5 along the axial direction of the rotating shaft 2 is located on the outer peripheral side of the first bearing 41 away from the first magnetic isolation ring 43, and the other end is located on the outer peripheral side of the second bearing 42 away from the second magnetic isolation ring 44, so that the evaporation section 511 of the heat pipe 5 can cover the magnetic sealing assembly 3 and the bearing assembly 4, ensuring good heat exchange performance for both. The heat pipe 5 may have two condensing sections 512 , which are disposed on both sides of the evaporating section 511 along the axial direction of the rotating shaft 2 , so as to further improve the heat exchange efficiency of the heat pipe 5 .

[0079] It should be noted that the heat conduction capacity of the heat pipe 5 exceeds that of known metals, and its specific structure and working principle can adopt existing technologies. For example, the heat pipe 5 generally includes a tube shell 52 and a liquid wick 53. The interior of the heat pipe 5 (i.e., the accommodating chamber 51) is usually pumped into 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 easily volatile. A liquid wick 53 is provided between the accommodating chamber 51 and the inner tube wall of the tube shell 52. The liquid wick 53 is made of a capillary porous material. The heat pipe 5 has an evaporation section 511 and a condensation section 512. When the evaporation section 511 is heated, the liquid in the capillary tube evaporates rapidly, and the vapor flows to the condensation section 512 under a small pressure difference, releasing heat and condensing into liquid again. The liquid then flows back to the evaporation section 511 along the porous material by capillary force, and the cycle continues. Heat is transferred from the evaporation section 511 to the condensation section 512. This cycle is carried out quickly, so heat can be conducted continuously.

[0080] like Figure 1 As shown, in some embodiments, the ratio between the thermal conductivity of the shell 13 and the thermal conductivity of the tube shell 52 is i, and i is 0.5 to 2, where i can be, for example, 0.5, 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0081] It can be understood that by designing the ratio between the thermal conductivity of the shell 13 and the thermal conductivity of the tube shell 52 within the aforementioned parameter range (in other words, the thermal conductivity of the shell 13 and the thermal conductivity of the tube shell 52 are similar), the heat exchange performance of the magnetic sealing assembly 3 and the bearing assembly 4 can be ensured.

[0082] Preferably, the thermal conductivity of the housing 13 is the same as that of the tube shell 52 , and both can be made of materials with high thermal conductivity.

[0083] The shell 13 is made of a magnetic conductive material, and preferably the shell 13 is made of a material with high magnetic conductivity.

[0084] like Figure 1 As shown, in some embodiments, the heat pipe 5 is detachably connected to the heat exchange channel 12, so as to facilitate the later disassembly and maintenance of the heat pipe 5. 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, thereby effectively reducing the maintenance cost of the sealing device.

[0085] like Figures 1 to 4 As shown, in some embodiments, the heat pipe 5 is slidably connected to the heat exchange channel 12 along the axial direction of the rotating shaft 2 .

[0086] The shell 1 is also provided with a disassembly hole 16, which is arranged and connected with the heat exchange channel 12 along the axial direction of the rotating shaft 2. The disassembly hole 16 is suitable for cooperating with at least part of the thread of the disassembly tool so that the heat pipe 5 can be pushed out along the axial direction of the rotating shaft 2 by the disassembly tool.

[0087] It can be understood that the installation of the heat pipe 5 in the heat exchange channel 12 can be completed by inserting the heat pipe 5 into the heat exchange channel 12, wherein the heat pipe 5 is completely placed in the heat exchange channel 12. When the heat pipe 5 needs to be removed from the heat exchange channel 12, the disassembly tool (such as a long screw) can be matched with the disassembly hole 16, and the disassembly tool can be screwed to gradually push the heat pipe 5 out of the heat exchange channel 12 under the spiral transmission action of the disassembly hole 16, thereby realizing the removal of the heat pipe 5.

[0088] Specifically, the heat exchange channel 12 may extend from the end surface of the housing 13 adjacent to the end cover 14 toward the end cover 14. The disassembly hole 16 may extend from the end surface of the housing 13 away from the end cover 14 toward the end cover 14. The disassembly hole 16 and the heat exchange channel 12 may be coaxially arranged. The disassembly hole 16 may be internally threaded. The disassembly tooling is not limited to long screws, long bolts, or long threaded rods.

[0089] like Figures 1 to 4 As shown, in some embodiments, there are multiple heat exchange channels 12 and they are arranged at intervals along the circumference of the rotating shaft 2, there are multiple heat pipes 5 and they correspond one-to-one to the heat exchange channels 12, and there are multiple disassembly holes 16 and they correspond one-to-one to the heat exchange channels 12.

[0090] It can be understood that the arrangement of multiple heat pipes 5 can further improve the heat exchange performance of the magnetic sealing assembly 3 and the bearing assembly 4, ensuring the heat exchange capacity of the sealing device.

[0091] Preferably, the plurality of heat exchange channels 12 are arranged at equal intervals along the circumference of the rotating shaft 2 to achieve uniform heat exchange of the sealing device.

[0092] like Figures 1 to 3 As shown, in some embodiments, the sealing device also includes heat dissipation fins 6, which are arranged on the side of the outer peripheral surface of the shell 1 away from the evaporation section 511, and the heat dissipation fins 6 and the condensation section 512 are arranged along the radial direction of the rotating shaft 2. In other words, the heat dissipation fins 6 are arranged on the part of the outer peripheral surface of the shell 13 corresponding to the condensation section 512.

[0093] There are multiple heat dissipation fins 6 and they are arranged at intervals along the axial direction of the rotating shaft 2. Preferably, the multiple heat dissipation fins 6 are arranged at equal intervals along the axial direction of the rotating shaft 2 to ensure uniform heat dissipation.

[0094] It can be understood that the heat dissipation fin 6 structure has a larger heat dissipation area than the smooth surface of the shell 13. Therefore, the heat dissipation fin 6 can accelerate the heat loss of the phase change medium in the condensation section 512, further shorten the cooling cycle time, and improve the heat exchange efficiency of the heat pipe 5.

[0095] Specifically, the heat dissipation fins 6 can be formed on the outer peripheral surface of the housing 13 by a processing method other than casting, machining, welding, and 3D printing. An appropriate processing method can be selected based on the actual working conditions. There can be two groups of heat dissipation fins 6, each group of heat dissipation fins 6 including a plurality of heat dissipation fins 6. The two groups of heat dissipation fins 6 correspond one-to-one to the two condensing sections 512. In other words, one of the two groups of heat dissipation fins 6 is arranged on the side of the first bearing 41 facing away from the first magnetic isolation ring 43, and the other is arranged on the side of the second bearing 42 facing away from the second magnetic isolation ring 44.

[0096] like Figure 1 As shown, in some embodiments, the sealing device further includes an impeller 7, which is sleeved on the rotating shaft 2 and located outside the housing 1. The rotating shaft 2 can drive the impeller 7 to rotate so that the housing 1 can perform convective heat exchange under the action of airflow.

[0097] It is understandable that the rotating shaft 2 can drive the impeller 7 to rotate, so that the impeller 7 blows the wind in the external environment to one side of the heat dissipation fins 6, so that the heat dissipation fins 6 can force convection heat exchange and further accelerate heat dissipation.

[0098] Specifically, in combination with the above structural design, the impeller 7 can be sleeved on the shaft sleeve 22 and spaced apart from the end cover 14 along the axial direction of the rotating shaft 2. The outer diameter of the impeller 7 is larger than the outer diameter of the heat dissipation fin 6.

[0099] It should be noted that although the increase in the rotation speed of the shaft 2 will cause the heat generation of the magnetic sealing assembly 3 and the bearing assembly 4 to increase, since it is the shaft 2 that drives the impeller 7 to rotate, the rotation speed of the impeller 7 will also increase accordingly, and the wind force generated accordingly will also increase, making the forced convection heat transfer capacity of the heat dissipation fins 6 stronger and the heat dissipation faster, thereby improving the heat exchange efficiency of the heat pipe 5. Therefore, the present invention has the function of adaptively enhancing heat exchange.

[0100] Therefore, the present invention has the following advantages over the related art:

[0101] 1) The heat pipe 5 with phase-change heat transfer characteristics is used to enhance heat transfer. At the same time, the heat dissipation fins 6 enhance the cooling efficiency of the condensing section 512 of the heat pipe 5, thereby enhancing heat transfer for both the magnetic medium 32 in the magnetic medium seal and the bearings in the magnetic medium seal. This allows for comprehensive thermal management of the magnetic medium seal, resulting in high heat dissipation efficiency.

[0102] 2) The rotating shaft 2 drives the impeller 7 to rotate, and the rotating impeller 7 forces the heat dissipation fins 6 to transfer heat by forced convection. The higher the speed, the stronger the forced convection heat transfer capacity, which can achieve adaptive thermal management of the magnetic medium seal.

[0103] 3) By adaptively enhancing the heat exchange design of the magnetic medium seal, the operating speed of the magnetic medium seal can be increased and the service life can be extended.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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 magnetic medium sealing device, characterized in that: include: a housing having a chamber and a heat exchange channel; 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 matched with the chamber and sleeved on the rotating shaft, the magnetic sealing assembly and the chamber defining a sealing gap, wherein a magnetic medium is adsorbed in the sealing gap; The heat exchange channels are arranged at intervals on the outer peripheral side of the chamber. A phase change medium is provided in the heat exchange channels. The phase change medium has a first state and a second state. 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 magnetic medium sealing device according to claim 1, characterized in that: It also includes a bearing assembly, which is matched with the chamber and sleeved on the rotating shaft. The bearing assembly and the magnetic sealing assembly are arranged along the axial direction of the rotating shaft. The phase change medium can be converted between the first state and the second state to exchange heat with the bearing assembly.

3. The magnetic medium sealing device according to claim 1, wherein: The heat pipe is also included, the heat pipe being matched with 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 along the axial direction of the rotating shaft, the evaporation section being closer to the magnetic sealing assembly than the condensation section; The phase change medium absorbs heat from the magnetic sealing assembly 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.

4. The magnetic medium sealing device according to claim 3, characterized in that: The heat pipe is detachably connected to the heat exchange channel.

5. The magnetic medium sealing device according to claim 4, characterized in that: The heat pipe is slidably connected to the heat exchange channel along the axial direction of the rotating shaft; The shell is also provided with a disassembly hole, which is arranged and connected with the heat exchange channel along the axial direction of the rotating shaft. The disassembly hole is suitable for cooperating with at least part of the thread of the disassembly tool so that the heat pipe can be ejected along the axial direction of the rotating shaft by the disassembly tool.

6. The magnetic medium sealing device according to claim 5, characterized in that: There are multiple heat exchange channels and they are spaced apart along the circumference of the rotating shaft. There are multiple heat pipes and they correspond one-to-one with the heat exchange channels. There are multiple disassembly holes and they correspond one-to-one with the heat exchange channels.

7. The magnetic medium sealing device according to claim 3, characterized in that: It also includes a heat dissipation fin, which is provided on a side of the outer peripheral surface of the housing away from the evaporation section, and the heat dissipation fin and the condensation section are arranged along the radial direction of the rotating shaft; There are a plurality of heat dissipation fins which are arranged at intervals along the axial direction of the rotating shaft.

8. The magnetic medium sealing device according to claim 1, wherein: It also includes an impeller, which is sleeved on the rotating shaft and located outside the shell. The rotating shaft can drive the impeller to rotate so that the shell can perform convection heat exchange under the action of airflow.

9. The magnetic medium sealing device according to claim 1, characterized in that: The housing includes a shell and an end cover sleeved on the rotating shaft, the shell and the end cover are connected along the axial direction of the rotating shaft and together define the chamber, and the shell is provided with the heat exchange channel; The sealing device further comprises a first sealing member, which is provided on a side of the housing facing away from the end cover. The first sealing member is suitable for sealing a connection gap between the housing and the sealed equipment.

10. The magnetic medium sealing device according to claim 1, wherein: The rotating shaft is provided with a shaft shoulder, and the sealing device further comprises a shaft sleeve and a first retaining spring, wherein the shaft sleeve and the first retaining spring are both sleeved on the rotating shaft, the shaft sleeve abuts against the shaft shoulder, and an end of the shaft sleeve facing away from the shaft shoulder abuts against the first retaining spring; The magnetic sealing component is sleeved on the shaft sleeve.

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