Cooling type magnetic powder sealing device and assembling method thereof

Abstract

The invention discloses a cooling type magnetic powder sealing device and an assembling method thereof. The cooling type magnetic powder sealing device comprises a rotating shaft, a shaft sleeve, a magnet, a plurality of pole shoes and a shell. The shaft sleeve sleeves the rotating shaft and is connected with the rotating shaft; the multiple pole shoes are arranged at intervals in the axial direction of the rotating shaft, the magnets are arranged between every two adjacent pole shoes, each pole shoe comprises a shoe seat and first pole teeth, the shoe seats are arranged on the shaft sleeve in a sleeving mode and can rotate relative to the shaft sleeve, the first pole teeth are arranged on the inner walls of the shoe seats, first sealing gaps used for being filled with magnetic powder are formed between the first pole teeth and the shaft sleeve, and the pole shoes are provided with first cooling channels. The first cooling channel is filled with gallium-indium alloy; the shell sleeves the pole shoe and is connected with the pole shoe. According to the cooling type magnetic powder sealing device, the magnetic powder in the first sealing gap can be cooled through the gallium-indium alloy in the first cooling channel, the probability that the magnetization intensity of the magnetic powder is reduced due to high temperature is reduced, and the sealing performance and the service life of the magnetic powder sealing device are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of sealing devices, and in particular to a cooling type magnetic powder sealing device and an assembling method thereof. Background Art

[0002] The magnetic powder seal is a sealing device that uses magnetic materials and magnetic field characteristics to achieve the sealing function. In the magnetic powder seal, there is usually a magnetic pole structure made of magnetic material. Based on the constraint effect of the magnetic field on the magnetic powder, when the magnetic field is applied to the magnetic pole, the magnetic powder filled in the sealing gap will be magnetized. The magnetized magnetic powder will form a structure similar to "magnetic chain" or "magnetic bridge" under the action of the magnetic field force. These magnetic chains are closely arranged and filled in the sealing gap, thereby preventing the gas or liquid and other media from leaking through the gap to achieve the purpose of sealing. It has the advantages of no friction and wear, long life, low maintenance cost, low leakage rate, etc., and can achieve a high degree of sealing for gas, liquid and other media.

[0003] When the speed of the equipment used in the magnetic powder sealing device is high, the magnetic powder needs to rotate at high speed with the rotating parts of the equipment, resulting in an increase in the centrifugal force of the magnetic powder. On the one hand, the increase in the centrifugal force of the magnetic powder will destroy the relatively stable arrangement structure of the magnetic powder, resulting in a weakening of the mutual restraint between the magnetic powders, which is prone to chaotic movement and collision. On the other hand, the increase in the centrifugal force of the magnetic powder will cause the magnetic powder to be squeezed more tightly in the sealing gap, increasing the friction between the magnetic powder and the rotating shaft. Both of these situations will lead to an increase in the frictional heat generated by the magnetic powder, which will increase the heat generated by the magnetic powder. High temperature will reduce the magnetization strength and other properties of the magnetic powder. In addition, high temperature will also cause thermal expansion of other parts of the magnetic powder sealing device, thereby changing the working parameters of the magnetic powder seal, resulting in problems such as a decrease in the sealing performance and a shortened service life of the magnetic powder sealing device. 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 cooling type magnetic powder sealing device. When the heat generated by the magnetic powder increases, the gallium-indium alloy in the first cooling channel can cool the magnetic powder in the first sealing gap, thereby reducing the probability of the magnetic powder's magnetization intensity being reduced due to high temperature, thereby ensuring the sealing performance and service life of the magnetic powder sealing device.

[0006] The cooling type magnetic powder sealing device of the embodiment of the present invention comprises a rotating shaft, a sleeve, a magnet, a plurality of pole shoes and a shell; the sleeve is sleeved on the rotating shaft and connected to the rotating shaft; the plurality of pole shoes are arranged at intervals along the axial direction of the rotating shaft, the magnet is arranged between two adjacent pole shoes, the pole shoe comprises a shoe seat and a first pole tooth, the shoe seat is sleeved on the sleeve and rotatable relative to the sleeve, the first pole tooth is arranged on the inner wall of the shoe seat and forms a first sealing gap for filling magnetic powder with the sleeve, the pole shoe has a first cooling channel extending along the circumference of the rotating shaft, the first cooling channel is filled with gallium-indium alloy; the shell is sleeved on the pole shoe and connected to the pole shoe.

[0007] In some embodiments, the first cooling channel has an opening arranged radially outward along the rotating shaft, the inner wall of the shell blocks the opening, and the shell has cooling holes arranged through it, and the cooling holes are connected to the first cooling channel so that the gallium-indium alloy flows into or out of the first cooling channel through the cooling holes.

[0008] In some embodiments, the outer wall of the boot seat has a plurality of first annular grooves extending along the circumference of the rotating shaft, at least two of the first annular grooves are respectively arranged on both sides of the first cooling channel, a first sealing ring is provided in the first annular groove, and the first sealing ring stops at the inner wall of the outer shell.

[0009] In some embodiments, the sleeve is made of a magnetically conductive material, and has a second cooling channel for filling the gallium-indium alloy.

[0010] In some embodiments, the inner wall of the sleeve has a second annular groove extending along the circumference of the rotating shaft, a second sealing ring is arranged in the second annular groove, and the second sealing ring abuts against the rotating shaft.

[0011] In some embodiments, there are multiple second sealing rings, and the multiple second sealing rings are evenly distributed along the axial direction of the rotating shaft.

[0012] In some embodiments, there is a gap area between two adjacent pole shoes, the sleeve includes an annular boss, the annular boss is arranged in the gap area, and the pole shoe also includes a second pole tooth arranged on the end surface of the shoe seat, and a second sealing gap for filling magnetic powder is formed between the second pole tooth and the annular boss.

[0013] In some embodiments, the number of the pole shoes is at least three, the two pole shoes arranged at the outermost sides along the axial direction of the rotating shaft are respectively the first pole shoe and the second pole shoe, the pole shoe arranged between the first pole shoe and the second pole shoe is the middle pole shoe, the end faces of the first pole shoe and the second pole shoe facing the annular boss have the second pole teeth, and both end faces of the middle pole shoe have the second pole teeth.

[0014] In some embodiments, the cooling type magnetic powder sealing device further includes a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the outer shell and are both connected to the outer shell.

[0015] The assembly method of the cooling type magnetic powder sealing device of the embodiment of the present invention is applicable to assembling the cooling type magnetic powder sealing device of any of the above embodiments, and the assembly method of the cooling type magnetic powder sealing device comprises the following steps:

[0016] Sleeving the shaft sleeve on the rotating shaft;

[0017] Installing the pole shoe and the magnet on the shaft sleeve in sequence to form the first sealing gap;

[0018] Filling the first sealing gap with magnetic powder;

[0019] The housing is sheathed on the pole shoe and connected to the pole shoe;

[0020] Gallium-indium alloy is injected into the first cooling channel.

[0021] The cooling type magnetic powder sealing device of the embodiment of the present invention uses gallium-indium alloy as a cooling medium. The gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has the advantages of high thermal conductivity, good fluidity, corrosion resistance, etc.; when the heat generated by the magnetic powder increases, the gallium-indium alloy in the first cooling channel can cool the pole shoe, and then cool the magnetic powder in the first sealing gap, thereby reducing the probability of the occurrence of the phenomenon such as the reduction of the magnetization intensity of the magnetic powder due to high temperature, thereby ensuring the sealing performance and service life of the magnetic powder sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a cooling type magnetic powder sealing device according to an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0024] Figure 3 yes Figure 1 A magnified schematic diagram of point B in the middle.

[0025] Figure 4 It is a schematic structural diagram of a cooling type magnetic powder sealing device according to another embodiment of the present invention.

[0026] Reference numerals:

[0027] 100. Cooling type magnetic powder sealing device;

[0028] 1. Rotating shaft; 11. Shoulder;

[0029] 2. Shaft sleeve; 21. Second cooling channel; 22. Second annular groove; 221. Second sealing ring; 23. Annular boss;

[0030] 3. Magnet; 31. First magnet; 32. Second magnet;

[0031] 4. pole shoe; 41. shoe seat; 411. first cooling channel; 4111. open; 412. first ring groove; 413. first sealing ring; 42. first pole tooth; 421. first sealing gap; 43. second pole tooth; 431. second sealing gap; 44. gap area; 45. first pole shoe; 46. second pole shoe; 47. middle pole shoe;

[0032] 5. Shell; 51. Cooling hole;

[0033] 6. Bearing; 61. Circlip; 62. Retaining ring;

[0034] 71. First end cover; 711. First protrusion; 72. Second end cover; 721. Second protrusion; 722. Flange portion. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figure 1 and Figure 2 As shown, the cooling type magnetic powder sealing device 100 of the embodiment of the present invention includes a rotating shaft 1, a sleeve 2, a magnet 3, a plurality of pole shoes 4 and a shell 5; the sleeve 2 is sleeved on the rotating shaft 1 and connected to the rotating shaft 1; the plurality of pole shoes 4 are arranged at intervals along the axial direction of the rotating shaft 1, the magnet 3 is arranged between two adjacent pole shoes 4, the pole shoe 4 includes a shoe seat 41 and a first pole tooth 42, the shoe seat 41 is sleeved on the sleeve 2 and can rotate relative to the sleeve 2, the first pole tooth 42 is arranged on the inner wall of the shoe seat 41 and forms a first sealing gap 421 for filling magnetic powder with the sleeve 2, the pole shoe 4 has a first cooling channel 411 extending along the circumference of the rotating shaft 1, and the first cooling channel 411 is filled with gallium-indium alloy; the shell 5 is sleeved on the pole shoe 4 and connected to the pole shoe 4.

[0037] The cooling type magnetic powder sealing device 100 of the embodiment of the present invention uses gallium-indium alloy as a cooling medium. The gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has the advantages of high thermal conductivity, good fluidity, corrosion resistance, etc.; when the heat generated by the magnetic powder increases, the gallium-indium alloy in the first cooling channel 411 can cool the pole shoe 4, and then cool the magnetic powder in the first sealing gap 421, thereby reducing the probability of the magnetic powder's magnetization intensity being reduced due to high temperature, and the like, thereby ensuring the sealing performance and service life of the magnetic powder sealing device.

[0038] like Figure 1 and Figure 2 As shown, the shaft 1 has a shoulder 11, and the sleeve 2 is sleeved on the shaft 1 and stops at the shoulder 11 to achieve the positioning and installation of the sleeve 2, and the sleeve 2 can rotate with the shaft 1 relative to the housing 5. The pole shoe 4 is cylindrical, the magnet 3 is a permanent magnet 3, and multiple pole shoes 4 are arranged at intervals along the axial direction of the shaft 1. The magnet 3 is arranged between two adjacent pole shoes 4, and a magnet 3 is arranged between every two adjacent pole shoes 4; the sleeve 2 is made of magnetic conductive material, and a magnetic circuit is formed between the sleeve 2, the pole shoe 4, and the magnet 3 to achieve the sealing function of the cooling type magnetic powder sealing device 100.

[0039] The first pole tooth 42 extends in a ring shape along the circumference of the shoe seat 41. The cross-section of the first pole tooth 42 is rectangular and extends radially inward along the shoe seat 41. There are multiple first pole teeth 42, and the multiple first pole teeth 42 are evenly distributed along the axial direction of the shoe seat 41. The multiple first pole teeth 42 and the outer wall of the sleeve 2 form multiple first sealing gaps 421. By injecting magnetic powder into the first sealing gaps 421, a closely arranged "magnetic chain" or "magnetic bridge" structure can be formed in the first sealing gaps 421 to achieve high sealing.

[0040] Alternatively, if Figure 1 As shown, the magnet 3 is annular and is sleeved on the shaft sleeve 2 , and the two end faces of the magnet 3 are respectively fitted to two adjacent pole shoes 4 .

[0041] Therefore, when the pole shoe 4 and the magnet 3 are installed, it is more conducive to achieve the mutual positioning of the pole shoe 4 and the magnet 3.

[0042] like Figure 1 As shown, a bearing 6 is also mounted on the rotating shaft 1. The inner ring of the bearing 6 is interference fit with the rotating shaft 1, and the outer ring of the bearing 6 is interference fit with the outer shell 5. The bearing 6 can play a role of rotation support between the rotating shaft 1 and the outer shell 5, so that the relative rotation of the outer shell 5 and the rotating shaft 1 is more stable.

[0043] The rotating shaft 1 also has an annular groove, which is arranged on the side of the bearing 6 away from the sleeve 2. A retaining spring 61 is arranged in the groove, and the inner ring of the bearing 6 abuts against the retaining spring 61, thereby achieving the positioning and installation of the bearing 6.

[0044] A retaining ring 62 is provided on the side of the bearing 6 close to the pole shoe 4, and the two sides of the retaining ring 62 are respectively fitted with the outer ring of the pole shoe 4 and the bearing 6, thereby realizing the positioning of the pole shoe 4 relative to the rotating shaft 1, so that a first sealing gap 421 can be formed between the first pole tooth 42 of the pole shoe 4 and the sleeve 2, and magnetic powder is filled into the first sealing gap 421, so that the sealing function of the cooling type magnetic powder sealing device 100 can be realized.

[0045] In some embodiments, Figure 1 As shown, the first cooling channel 411 has an opening 4111 arranged radially outward along the rotating shaft 1, the inner wall of the shell 5 blocks the opening 4111, and the shell 5 has a cooling hole 51 arranged through it. The cooling hole 51 is connected to the first cooling channel 411 so that the gallium-indium alloy flows into or out of the first cooling channel 411 through the cooling hole 51.

[0046] The cooling hole 51 can be connected to an external pipeline so that the gallium-indium alloy can flow into or out of the first cooling channel 411, thereby cooling the magnetic powder and related components such as the pole shoe 4, reducing the temperature of the magnetic powder, and ensuring the sealing of the cooling type magnetic powder sealing device 100.

[0047] like Figure 1 As shown, each pole shoe 4 has the above-mentioned first cooling channel 411, which is arranged on the shoe seat 41 and extends in a ring shape along the circumference of the pole shoe 4, thereby being able to perform more comprehensive cooling of the magnetic powder arranged in a ring shape.

[0048] The cooling holes 51 are arranged radially through the shell and connected to the first cooling channel 411. There are multiple cooling holes 51, preferably two. The two cooling holes 51 are arranged at intervals along the circumference of the shell 5. The two cooling holes 51 are respectively used for the gallium-indium alloy to flow in and out, which makes the operation more convenient.

[0049] Of course, in other embodiments, the number of the cooling hole 51 may also be one, and the inflow and outflow of the gallium-indium alloy are both achieved through the cooling hole 51 .

[0050] In some embodiments, Figure 1 As shown, the outer wall of the shoe seat 41 has a plurality of first annular grooves 412 extending along the circumference of the rotating shaft 1, at least two first annular grooves 412 are respectively arranged on both sides of the first cooling channel 411, and a first sealing ring 413 is provided in the first annular groove 412, and the first sealing ring 413 stops at the inner wall of the shell 5.

[0051] By providing first sealing rings 413 on both sides of the first cooling channel 411 , the opening 4111 of the first cooling channel 411 can be further sealed, thereby reducing the probability of the gallium-indium alloy in the first cooling channel 411 leaking from the contact position between the pole shoe 4 and the housing 5 .

[0052] Alternatively, if Figure 1 As shown, the number of the first annular grooves 412 is two.

[0053] In some embodiments, the sleeve 2 is made of a magnetic conductive material, and has a second cooling channel 21 for filling the gallium-indium alloy.

[0054] By providing a second cooling channel 21 on the sleeve 2 and injecting gallium-indium alloy into the second cooling channel 21, the sleeve 2 can be cooled when its temperature rises, thereby cooling the magnetic powder in the first sealing gap 421, thereby reducing the probability of the magnetic powder's magnetization intensity being reduced due to high temperature, and ensuring the sealing performance and service life of the magnetic powder sealing device.

[0055] In addition, since the sleeve 2 is made of magnetic conductive material, the sleeve 2, the pole shoe 4 and the magnet 3 can form a magnetic circuit. By providing a second cooling channel 21 on the sleeve 2, the integrity of the shaft 1 can be maintained without destroying the shaft 1.

[0056] As an example, Figure 1 As shown, the second cooling channel 21 extends in a ring shape along the circumference of the sleeve 2, with one end of the second cooling channel 21 being open and the other end being closed and extending along the axial direction of the sleeve 2 to one end of the sleeve 2 close to the shoulder 11, so that the second cooling channel 21 can cover multiple pole shoes 4 along the axial direction of the sleeve 2, and cool the magnetic powder in multiple first sealing gaps 421 at the same time, thereby improving the cooling efficiency.

[0057] It is understandable that a sealing ring (not shown in the figure) is provided at the open end of the second cooling channel 21, which can seal the second cooling channel 21 to form a closed second cooling channel 21 to ensure the stability of the gallium-indium alloy in the second cooling channel 21.

[0058] Optionally, the sealing ring is also provided with cooling holes, which are connected to an external pipeline so that the gallium-indium alloy can flow into or out of the second cooling channel 21 .

[0059] In some embodiments, Figure 1 As shown, the inner wall of the sleeve 2 has a second annular groove 22 extending along the circumferential direction of the rotating shaft 1 , and a second sealing ring 221 is disposed in the second annular groove 22 , and the second sealing ring 221 abuts against the rotating shaft 1 .

[0060] By providing the second sealing ring 221 , the sealing ring can play a sealing role between the shaft sleeve 2 and the rotating shaft 1 , thereby ensuring the sealing effect of the cooling type magnetic powder sealing device 100 .

[0061] In some embodiments, there are multiple second sealing rings 221 , and the multiple second sealing rings 221 are evenly distributed along the axial direction of the rotating shaft 1 .

[0062] When the number of pole shoes 4 is large, the length of the shaft sleeve 2 increases accordingly. By providing a plurality of second sealing rings 221 , the sealing between the shaft sleeve 2 and the rotating shaft 1 can be ensured.

[0063] Optionally, the second sealing ring 221 corresponds to the second annular groove 22 one by one.

[0064] In some embodiments, Figure 1 and Figure 3 As shown, there is a gap area 44 between two adjacent pole shoes 4, the sleeve 2 includes an annular boss 23, the annular boss 23 is arranged in the gap area 44, and the pole shoe 4 also includes a second pole tooth 43 arranged on the end surface of the shoe seat 41, and a second sealing gap 431 for filling magnetic powder is formed between the second pole tooth 43 and the annular boss 23.

[0065] Through the above arrangement, a second sealing gap 431 is formed between the second pole tooth 43 and the annular boss 23 . By filling magnetic powder into the second sealing gap 431 , a sealing structure can be formed on the end surface of the pole shoe 4 , further improving the sealing performance of the cooling magnetic powder sealing device 100 .

[0066] It is understandable that the gallium-indium alloy in the first cooling channel 411 and the second cooling channel 21 can also cool down the magnetic powder in the second sealing gap 431 .

[0067] As an example, Figure 1 and Figure 3 As shown, the second pole teeth 43 extend in a ring shape along the circumference of the rotating shaft 1, and there are multiple second pole teeth 43. The multiple second pole teeth 43 are evenly arranged in sequence along the radial direction of the rotating shaft 1, that is, the diameter of the annular structure formed by the multiple second pole teeth 43 increases evenly from the inside to the outside, and each second pole tooth 43 forms a second sealing gap 431 with the annular boss 23.

[0068] In some embodiments, Figure 4 As shown, the number of pole shoes 4 is at least three, and the two pole shoes 4 arranged on the outermost sides along the axial direction of the rotating shaft 1 are respectively the first pole shoe 45 and the second pole shoe 46, and the pole shoe 4 arranged between the first pole shoe 45 and the second pole shoe 46 is the middle pole shoe 47, and the end faces of the first pole shoe 45 and the second pole shoe 46 facing the annular boss 23 have second pole teeth 43, and both end faces of the middle pole shoe 47 have second pole teeth 43.

[0069] Through the above arrangement, the first pole shoe 45, the middle pole shoe 47 and the second pole shoe 46 are sequentially installed on the shaft sleeve 2, and a second sealing gap 431 is formed between one end of the first pole shoe 45 and the second pole shoe 46 and the annular boss 23, and both ends of the middle pole shoe 47 form a second sealing gap 431 with the adjacent annular boss 23, thereby forming a relatively stable sealing structure and improving the sealing performance of the cooling type magnetic powder sealing device 100.

[0070] Optionally, the middle pole shoe 47 is configured to be a split-petal type.

[0071] The middle pole shoe 47 is divided into a plurality of pole shoe petals, and the plurality of pole shoe petals form a complete middle pole shoe 47 , thereby making it easier to install the middle pole shoe 47 between two adjacent annular bosses 23 .

[0072] As an example, Figure 4 As shown, there are three pole shoes 4 , and a first pole shoe 45 and a second pole shoe 46 are arranged opposite to each other at two ends of a middle pole shoe 47 .

[0073] There are two annular bosses 23 , one annular boss 23 is arranged in the gap area 44 formed by the first pole shoe 45 and the middle pole shoe 47 , and the other annular boss 23 is arranged in the gap area 44 formed by the second pole shoe 46 and the middle pole shoe 47 .

[0074] There are three second sealing rings 221 , which are arranged in sequence along the axial direction of the shaft sleeve 2 , so as to achieve better sealing between the shaft sleeve 2 and the rotating shaft 1 .

[0075] In some embodiments, Figure 1 and Figure 4 As shown, the cooling type magnetic powder sealing device 100 further includes a first end cover 71 and a second end cover 72 . The first end cover 71 and the second end cover 72 are respectively arranged at two ends of the housing 5 and are both connected to the housing 5 .

[0076] The pole shoes 4 , the magnets 3 , the bearings 6 and other components are arranged inside the housing 5 . The first end cover 71 and the second end cover 72 can seal the two ends of the housing 5 , thereby protecting the components arranged inside the housing 5 .

[0077] As an example, Figure 1 As shown, the first end cover 71 and the second end cover 72 are arranged relatively at the two ends of the outer shell 5, and are both mounted on the rotating shaft 1; the outer wall of the first end cover 71 has an external thread, and the inner wall of the outer shell 5 near the first end cover 71 has an internal thread, and the first end cover 71 and the outer shell 5 are threadedly matched to realize the connection between the first end cover 71 and the outer shell 5; the first end cover 71 includes a first protrusion 711, and the first protrusion 711 stops at the first pole shoe 45 to realize the positioning of the first end cover 71.

[0078] The second end cover 72 includes a second protrusion 721 and a flange portion 722. The second protrusion 721 is arranged inside the outer shell 5 and stops at the bearing 6, so as to realize the positioning of the second end cover 72. The flange is arranged outside the outer shell 5 and is connected to the outer shell 5 through a plurality of bolts, thereby realizing the connection between the second end cover 72 and the outer shell 5.

[0079] The assembly method of the cooling type magnetic powder sealing device according to the embodiment of the present invention is applicable to assembling the cooling type magnetic powder sealing device 100 according to any of the above embodiments. The assembly method of the cooling type magnetic powder sealing device comprises the following steps:

[0080] Put the shaft sleeve 2 on the rotating shaft 1;

[0081] The pole piece 4 and the magnet 3 are sequentially mounted on the shaft sleeve 2 to form a first sealing gap 421;

[0082] Filling magnetic powder into the first sealing gap 421;

[0083] The housing 5 is mounted on the pole shoe 4 and connected to the pole shoe 4;

[0084] The gallium-indium alloy is injected into the first cooling channel 411 .

[0085] The cooling type magnetic powder sealing device 100 of the embodiment of the present invention uses gallium-indium alloy as a cooling medium. The gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has the advantages of high thermal conductivity, good fluidity, corrosion resistance, etc.; when the heat generated by the magnetic powder increases, the gallium-indium alloy in the first cooling channel 411 can cool the pole shoe 4, and then cool the magnetic powder in the first sealing gap 421, thereby reducing the probability of the magnetic powder's magnetization intensity being reduced due to high temperature, and the like, thereby ensuring the sealing performance and service life of the magnetic powder sealing device.

[0086] As an example, Figure 4 As shown, the cooling type magnetic powder sealing device 100 includes three pole shoes 4. The cooling type magnetic powder sealing device 100 is further described based on the left and right directions shown in the figure, wherein the first pole shoe 45 is arranged on the left, the second pole shoe 46 is arranged on the right, the magnet 3 arranged on the left is the first magnet 31, and the magnet 3 arranged on the right is the second magnet 32; the assembly method of the cooling type magnetic powder sealing device includes the following steps:

[0087] S1: Install three second sealing rings 221 in the three second ring grooves 22 of the shaft sleeve 2 respectively, and sleeve the shaft sleeve 2 onto the rotating shaft 1, so that the shaft sleeve 2 stops against the shaft shoulder 11 of the rotating shaft 1;

[0088] S2: The first sealing rings 413 are respectively installed in the two first annular grooves 412 of the first pole shoe 45, and the first pole shoe 45 is mounted on the shaft sleeve 2 from the left side of the shaft sleeve 2, so that the first sealing gap 421 and the second sealing gap 431 are respectively formed at the first pole teeth 42 and the second pole teeth 43 of the first pole shoe 45;

[0089] The first magnet 31 is fitted on the right side of the first pole shoe 45, and the first sealing gap 421 and the second sealing gap 431 of the first pole shoe 45 are filled with magnetic powder;

[0090] S3: Multiple pole shoe petals of the middle pole shoe 47 are spliced ​​and installed between the two annular bosses 23, and are fitted with the right side of the first magnet 31. Then, the first sealing rings 413 are respectively installed into the two first annular grooves 412 of the middle pole shoe 47, and the first sealing gap 421 and the second sealing gap 431 of the middle pole shoe 47 are filled with magnetic powder;

[0091] S4: Fit the second magnet 32 ​​to the right side of the middle pole shoe 47, install the first sealing ring 413 into the two first ring grooves 412 of the second pole shoe 46 respectively, and put the second pole shoe 46 on the shaft sleeve 2 from the right side of the shaft sleeve 2, and then fill the first sealing gap 421 and the second sealing gap 431 of the second pole shoe 46 with magnetic powder;

[0092] S5: Install the retaining ring 62 and the bearing 6 in sequence, and position the bearing 6 through the retaining ring 61;

[0093] S6: The housing 5 is mounted on the outer sides of the plurality of pole shoes 4, and the first end cover 71 is mounted on the left side of the housing 5, and the second end cover 72 is mounted on the right side of the housing 5, thereby completing the assembly of the cooling type magnetic powder sealing device 100;

[0094] S7: Injecting gallium-indium alloy into the first cooling channel 411 and the second cooling channel 21 .

[0095] It is understandable that the above description of the cooling type magnetic powder sealing device 100 is also applicable to the assembly method, and will not be repeated here.

[0096] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0100] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cooling type magnetic powder sealing device (100), characterized in that: include: A rotating shaft (1); A shaft sleeve (2), the shaft sleeve (2) being sleeved on the rotating shaft (1) and connected to the rotating shaft (1); A magnet (3) and a plurality of pole shoes (4), wherein the plurality of pole shoes (4) are arranged at intervals along the axial direction of the rotating shaft (1), the magnet (3) is arranged between two adjacent pole shoes (4), the pole shoe (4) comprises a shoe seat (41) and a first pole tooth (42), the shoe seat (41) is mounted on the shaft sleeve (2) and is rotatable relative to the shaft sleeve (2), the first pole tooth (42) is arranged on the inner wall of the shoe seat (41) and forms a first sealing gap (421) for filling magnetic powder with the shaft sleeve (2), the pole shoe (4) has a first cooling channel (411) extending along the circumference of the rotating shaft (1), and the first cooling channel (411) is filled with a gallium-indium alloy; A housing (5) is mounted on the pole shoe (4) and connected to the pole shoe (4).

2. The cooling type magnetic powder sealing device (100) according to claim 1, characterized in that: The first cooling channel (411) has an opening (4111) arranged radially outwardly along the rotating shaft (1), the inner wall of the shell (5) blocks the opening (4111), the shell (5) has a cooling hole (51) arranged through it, and the cooling hole (51) is connected to the first cooling channel (411), so that the gallium-indium alloy flows into or flows out of the first cooling channel (411) through the cooling hole (51).

3. The cooling type magnetic powder sealing device (100) according to claim 2, characterized in that: The outer wall of the shoe seat (41) has a plurality of first annular grooves (412) extending along the circumference of the rotating shaft (1), at least two of the first annular grooves (412) are respectively arranged on both sides of the first cooling channel (411), and a first sealing ring (413) is provided in the first annular groove (412), and the first sealing ring (413) abuts against the inner wall of the outer shell (5).

4. The cooling type magnetic powder sealing device (100) according to claim 1, characterized in that: The shaft sleeve (2) is made of a magnetically conductive material, and the shaft sleeve (2) has a second cooling channel (21) for filling a gallium-indium alloy.

5. The cooling type magnetic powder sealing device (100) according to claim 4, characterized in that: The inner wall of the shaft sleeve (2) has a second annular groove (22) extending along the circumference of the rotating shaft (1), a second sealing ring (221) is arranged in the second annular groove (22), and the second sealing ring (221) abuts against the rotating shaft (1).

6. The cooling type magnetic powder sealing device (100) according to claim 5, characterized in that: There are a plurality of second sealing rings (221), and the plurality of second sealing rings (221) are evenly distributed along the axial direction of the rotating shaft (1).

7. The cooling type magnetic powder sealing device (100) according to any one of claims 1 to 6, characterized in that: There is a gap area (44) between two adjacent pole shoes (4), the sleeve (2) includes an annular boss (23), and the annular boss (23) is arranged in the gap area (44). The pole shoe (4) also includes a second pole tooth (43) arranged on the end surface of the shoe seat (41), and a second sealing gap (431) for filling magnetic powder is formed between the second pole tooth (43) and the annular boss (23).

8. The cooling type magnetic powder sealing device (100) according to claim 7, characterized in that: The number of the pole shoes (4) is at least three. The two pole shoes (4) arranged at the outermost sides along the axial direction of the rotating shaft (1) are respectively a first pole shoe (45) and a second pole shoe (46). The pole shoe (4) arranged between the first pole shoe (45) and the second pole shoe (46) is an intermediate pole shoe (47). The end surfaces of the first pole shoe (45) and the second pole shoe (46) facing the annular boss (23) have the second pole teeth (43), and both end surfaces of the intermediate pole shoe (47) have the second pole teeth (43).

9. The cooling type magnetic powder sealing device (100) according to claim 1, characterized in that: It also comprises a first end cover (71) and a second end cover (72), wherein the first end cover (71) and the second end cover (72) are respectively arranged at two ends of the outer shell (5) and are both connected to the outer shell (5).

10. A method for assembling a cooling magnetic powder sealing device, characterized in that: Suitable for assembling the cooling type magnetic powder sealing device (100) according to any one of claims 1 to 9, the assembling method of the cooling type magnetic powder sealing device comprises the following steps: Sleeving the shaft sleeve (2) onto the rotating shaft (1); The pole shoe (4) and the magnet (3) are sequentially mounted on the shaft sleeve (2) to form the first sealing gap (421); Filling magnetic powder into the first sealing gap (421); The housing (5) is mounted on the pole shoe (4) and connected to the pole shoe (4); Gallium-indium alloy is injected into the first cooling channel (411).

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