Cooling type magnetic powder sealing device and assembly method thereof

Abstract

The present invention discloses a cooling-type magnetic powder sealing device and an assembly method thereof. The cooling-type magnetic powder sealing device includes a rotating shaft, a sleeve, a magnet, a plurality of pole shoes, and a housing. The sleeve is fitted onto and connected to the rotating shaft. The plurality of pole shoes are spaced apart along the axial direction of the rotating shaft, with the magnet arranged between two adjacent pole shoes. The pole shoes include a shoe seat and a first pole tooth. The shoe seat is fitted onto the sleeve and is rotatable relative to the sleeve. The first pole tooth is disposed on the inner wall of the shoe seat and forms a first sealing gap with the sleeve for filling magnetic powder. The pole shoe has a first cooling channel filled with a gallium-indium alloy. The housing is fitted onto and connected to the pole shoe. In the cooling-type magnetic powder sealing device of the present invention, the gallium-indium alloy in the first cooling channel can cool the magnetic powder in the first sealing gap, 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.

Description

Technical Field

[0001] The present 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] A magnetic powder seal utilizes the properties of magnetic materials and magnetic fields to achieve a seal. A magnetic powder seal typically includes a magnetic pole structure made of magnetic material. When a magnetic field is applied to the pole, the magnetic powder filling the sealed gap becomes magnetized, due to the magnetic field's restraining effect on the magnetic powder. The magnetized magnetic powder forms a structure similar to "magnetic chains" or "magnetic bridges" under the influence of the magnetic field. These chains are tightly arranged and fill the sealed gap, preventing media such as gas or liquid from leaking through the gap, achieving a sealed seal. This seal offers advantages such as zero friction and wear, a long lifespan, low maintenance costs, and a low leakage rate, achieving a high degree of sealing for media such as gas and liquid.

[0003] When the equipment used in a magnetic powder seal operates at high speeds, the magnetic powder must rotate at high speeds along with the rotating components of the equipment, increasing the centrifugal force on the powder. This increased centrifugal force disrupts the relatively stable arrangement of the powder, weakening the mutual restraint between the powders and making chaotic movement and collisions more likely. Furthermore, this increased centrifugal force compresses the powder more tightly into the sealing gap, increasing friction between the powder and the rotating shaft. Both of these situations increase frictional heat generation, increasing the powder's heat output. High temperatures can reduce the powder's magnetization and other properties. Furthermore, high temperatures can cause thermal expansion in other components of the magnetic powder seal, altering the seal's operating parameters and leading to reduced sealing performance and a shortened service life. 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 magnetic powder sealing device of an embodiment of the present invention includes 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, and the magnet is arranged between two adjacent pole shoes. The pole shoe includes a shoe seat and a first pole tooth, the shoe seat is sleeved on the sleeve and is 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 with the sleeve for filling magnetic powder, the pole shoe has a first cooling channel extending along the circumference of the rotating shaft, and 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 therethrough, 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, and 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 magnetic conductive material and has a second cooling channel for filling a 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 provided 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 face 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, and the two pole shoes arranged on the outermost sides along the axial direction of the rotating shaft are respectively the first pole shoe and the second pole shoe, and the pole shoe arranged between the first pole shoe and the second pole shoe is the middle pole shoe, and 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 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 shell and are both connected to the shell.

[0015] 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 according to any of the above embodiments. The assembly method of the cooling type magnetic powder sealing device comprises the following steps:

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

[0017] Mounting 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] Putting the housing on the pole shoe and connecting it 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. Gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has advantages such as high thermal conductivity, good fluidity, and corrosion resistance. 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 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. 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 Enlarged schematic diagram of point A in the middle.

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

[0025] Figure 4 It is a structural schematic 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. Opening; 412. First annular 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. Intermediate 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. DETAILED DESCRIPTION

[0035] 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.

[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, and 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 provided 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. Gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has advantages such as high thermal conductivity, good fluidity, and corrosion resistance. 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 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. The sleeve 2 is mounted on the shaft 1 and abuts against the shoulder 11 to position and install the sleeve 2. The sleeve 2 can rotate with the shaft 1 relative to the housing 5. The pole shoe 4 is cylindrical, and the magnet 3 is a permanent magnet 3. Multiple pole shoes 4 are spaced apart along the axial direction of the shaft 1. The magnet 3 is located between two adjacent pole shoes 4, and a magnet 3 is located between each pair of adjacent pole shoes 4. The sleeve 2 is made of a magnetically 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 cooled magnetic powder sealing device 100.

[0039] The first pole teeth 42 extend in a ring shape along the circumference of the shoe seat 41. The cross-section of the first pole teeth 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 tightly arranged "magnetic chain" or "magnetic bridge" structure can be formed in the first sealing gaps 421 to achieve high sealing.

[0040] Alternatively, as 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 in contact with two adjacent pole shoes 4 .

[0041] Therefore, when the pole shoe 4 and the magnet 3 are installed, it is more conducive to achieving 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 has an interference fit with the rotating shaft 1, and the outer ring of the bearing 6 has an 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 shaft sleeve 2. Filling the first sealing gap 421 with magnetic powder can realize the sealing function of the cooling type magnetic powder sealing device 100.

[0045] In some embodiments, as 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 performance of the cooling magnetic powder sealing device 100.

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

[0048] The cooling holes 51 are arranged radially through the shell and are 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, as 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, and at least two first annular grooves 412 are respectively arranged on both sides of the first cooling channel 411. 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, as Figure 1 As shown, there are two first annular grooves 412 .

[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, one end of the second cooling channel 21 is open, and the other end is closed and extends along the axial direction of the sleeve 2 to the end of the sleeve 2 close to the shaft shoulder 11, so that the second cooling channel 21 can cover multiple pole shoes 4 along the axial direction of the sleeve 2, and at the same time cool the magnetic powder in multiple first sealing gaps 421, 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, thereby ensuring the stability of the gallium-indium alloy in the second cooling channel 21.

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

[0059] In some embodiments, as Figure 1 As shown, the inner wall of the sleeve 2 has a second annular groove 22 extending along the circumference of the rotating shaft 1 . A second sealing ring 221 is disposed in the second annular groove 22 . 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 in a one-to-one manner.

[0064] In some embodiments, as 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, 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 face 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 the second sealing gap 431 with magnetic powder, a sealing structure can be formed on the end face 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. There are multiple second pole teeth 43, and 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, as Figure 4 As shown, the number of pole shoes 4 is at least three, and the two pole shoes 4 arranged on the outermost side 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 intermediate pole shoe 47. 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 intermediate 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 of which is arranged in the gap 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 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 , thereby achieving better sealing between the shaft sleeve 2 and the rotating shaft 1 .

[0075] In some embodiments, as 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 , magnets 3 , bearings 6 and other components are arranged inside the housing 5 . The first end cover 71 and the second end cover 72 can seal both 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 is threadedly matched with the outer shell 5 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, which can 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 multiple bolts, thereby realizing the connection between the second end cover 72 and the outer shell 5.

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

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

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

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

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

[0084] 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. Gallium-indium alloy can remain in liquid state at room temperature, has relatively stable performance, and has advantages such as high thermal conductivity, good fluidity, and corrosion resistance. 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 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 provided on the left, the second pole shoe 46 is provided on the right, the magnet 3 provided on the left is the first magnet 31, and the magnet 3 provided 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 the three second sealing rings 221 in the three second ring grooves 22 of the shaft sleeve 2 respectively, and then fit the shaft sleeve 2 onto the rotating shaft 1, with the shaft sleeve 2 resting against the shaft shoulder 11 of the rotating shaft 1;

[0088] S2: Install the first sealing rings 413 in the two first annular grooves 412 of the first pole shoe 45, respectively. Then, insert the first pole shoe 45 onto the shaft sleeve 2 from the left side. A first sealing gap 421 and a second sealing gap 431 are formed at the first pole teeth 42 and the second pole teeth 43 of the first pole shoe 45, respectively.

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

[0090] S3: The multiple pole shoe petals of the middle pole shoe 47 are spliced ​​together and installed between the two annular bosses 23, and are aligned with the right side of the first magnet 31. Then, the first sealing rings 413 are respectively installed in 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 annular grooves 412 of the second pole shoe 46, and insert the second pole shoe 46 onto the shaft sleeve 2 from the right side. 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 installed on the left side of the housing 5, and the second end cover 72 is installed 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 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 cooling type magnetic powder sealing device (100), characterized in that: include: 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 fitted 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), the housing (5) being sleeved on the pole shoe (4) and connected to the pole shoe (4); the first cooling channel (411) having an opening (4111) arranged radially outward along the rotating shaft (1), the inner wall of the housing (5) blocking the opening (4111), the housing (5) having a cooling hole (51) arranged therethrough, the cooling hole (51) being in communication with 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); The shaft sleeve (2) is made of a magnetic conductive material, and the shaft sleeve (2) has a second cooling channel (21) for filling a gallium-indium alloy; 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 provided in the second annular groove (22), and the second sealing ring (221) abuts against the rotating shaft (1).

2. The cooling type magnetic powder sealing device (100) according to claim 1, 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 housing (5).

3. The cooling type magnetic powder sealing device (100) according to claim 1, characterized in that: 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).

4. The cooling type magnetic powder sealing device (100) according to any one of claims 1 to 3, 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).

5. The cooling type magnetic powder sealing device (100) according to claim 4, characterized in that: The number of the pole shoes (4) is at least three, and 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), and the pole shoe (4) arranged between the first pole shoe (45) and the second pole shoe (46) is an intermediate 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 the second pole teeth (43), and both end faces of the intermediate pole shoe (47) have the second pole teeth (43).

6. The cooling type magnetic powder sealing device (100) according to claim 1, characterized in that: It also includes 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 shell (5) and are both connected to the shell (5).

7. 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 6, 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); Mounting the pole shoe (4) and the magnet (3) on the shaft sleeve (2) in sequence to form the first sealing gap (421); Filling the first sealing gap (421) with magnetic powder; The housing (5) is fitted onto the pole shoe (4) and connected to the pole shoe (4); Gallium-indium alloy is injected into the first cooling channel (411).

Images