CN214146601U - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
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- CN214146601U CN214146601U CN202022766744.8U CN202022766744U CN214146601U CN 214146601 U CN214146601 U CN 214146601U CN 202022766744 U CN202022766744 U CN 202022766744U CN 214146601 U CN214146601 U CN 214146601U
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Abstract
The utility model discloses a magnetic liquid sealing device, magnetic liquid sealing device includes the casing, the apparatus further comprises a rotating shaft, the permanent magnet, first pole shoe and second pole shoe are all established in the pivot, first pole shoe includes first base member and first loop-forming element, the outer peripheral face of first loop-forming element links to each other with the inner peripheral surface of first base member, the inner peripheral surface of first loop-forming element is equipped with a plurality of first annular utmost point teeth of controlling the interval arrangement, the second pole shoe includes second base member and second loop-forming element, the outer peripheral face of second loop-forming element links to each other with the inner peripheral surface of second base member, the inner peripheral surface of second loop-forming element is equipped with a plurality of second annular utmost point teeth of controlling the interval arrangement, the permanent magnet cover is established in the pivot, the clearance has between permanent magnet and the pivot, the permanent magnet is connected first base member with between the second base member. The utility model discloses a magnetic liquid sealing device of embodiment need not change whole pole shoe when the utmost point tooth wearing and tearing, can save the cost.
Description
Technical Field
The utility model relates to a sealed technical field specifically, relates to a magnetic liquid sealing device.
Background
The magnetic liquid can be applied to the field of sealing, and a magnetic loop is utilized to form a magnetic field gradient in a sealing gap. The magnetic liquid can be acted by the magnetic field force under the magnetic field gradient to form a plurality of liquid O-shaped rings, so that the sealing effect is realized.
In the related art, the pole shoe and the pole tooth of the magnetic fluid sealing device are integrated, the pole tooth is provided on the inner circumferential surface of the pole shoe by machining, and a seal gap is formed between the pole tooth of the pole shoe of the magnetic fluid sealing device and the rotating shaft. Because the sealing clearance between the pole teeth and the shaft of the magnetic liquid sealing device is small, and the machining precision of the pole teeth is not high, the pole teeth are likely to be abraded in the working process of the magnetic liquid sealing device. Once the pole teeth are worn, the pole teeth are difficult to adjust through machining, only new pole shoes can be replaced, the replacement cost of the pole shoes is high, and particularly, the replacement cost of the pole shoes with large sizes is high.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the embodiment of the present invention provides a magnetic liquid sealing device, which does not need to replace the whole pole shoe when the pole teeth are worn, and can save the cost.
According to the utility model discloses magnetic liquid sealing device includes:
the shell is made of a non-magnetic conductive material and provided with a cavity, the cavity comprises a sealed cavity, and magnetic liquid is filled in the sealed cavity;
the rotating shaft is made of magnetic conductivity materials, the rotating shaft penetrates through the shell along the axial direction of the rotating shaft, at least part of the rotating shaft is located in the cavity, and the axial direction of the rotating shaft is approximately parallel to the length direction of the shell;
the first pole shoe and the second pole shoe are positioned in the sealing cavity, the first pole shoe and the second pole shoe are sleeved on the rotating shaft, the first pole shoe and the second pole shoe are arranged along the axial direction of the rotating shaft at intervals, the first pole shoe comprises a first base body and a first annular piece, the outer peripheral surface of the first base body is in contact with the inner peripheral surface of the shell, the first annular piece is arranged on the inner peripheral surface of the first base body, the inner peripheral surface of the first annular piece is provided with a plurality of first annular pole teeth arranged along the axial direction of the rotating shaft at intervals, the second pole shoe comprises a second base body and a second annular piece, the outer peripheral surface of the second base body is in contact with the inner peripheral surface of the shell, the outer peripheral surface of the second annular piece is connected with the inner peripheral surface of the second base body, and the inner peripheral surface of the second annular piece is provided with a plurality of second annular pole teeth arranged along the axial direction of the rotating shaft at intervals, a sealing gap is formed between the inner surface of the first annular pole tooth and the rotating shaft and between the inner surface of the second annular pole tooth and the rotating shaft, and the magnetic liquid is suitable for being adsorbed in the sealing gap under the action of magnetic force;
the permanent magnet, the permanent magnet is located in the sealed intracavity, just the permanent magnet cover is established in the pivot, the permanent magnet with the clearance has between the pivot, the permanent magnet is connected first base member with between the second base member.
According to the utility model discloses magnetic liquid sealing device's pole shoe is split type structure, and the pole shoe includes base member and loop forming element, and the internal surface at the loop forming element is established to the utmost point tooth, and whole pole shoe need not be changed after the utmost point tooth wearing and tearing, only needs to change or repair the loop forming element, the utility model discloses magnetic liquid sealing device's use cost reduces.
In some embodiments, the first and second annular teeth are rectangular, triangular, saw-tooth, or trapezoidal in cross-section.
In some embodiments, the first ring member may be connected to an inner circumferential surface of the first base body by 3D printing, and the second ring member may be connected to an inner circumferential surface of the second base body by 3D printing.
In some embodiments, the magnetic liquid sealing device further comprises a first sealing ring and a second sealing ring, the outer peripheral surface of the first base body is provided with a first annular groove, and the outer peripheral surface of the second base body is provided with a second annular groove;
the first sealing ring is matched in the first annular groove and is contacted with the inner circumferential surface of the shell,
the second sealing ring is matched in the second annular groove and is in contact with the inner circumferential surface of the shell.
In some embodiments, the first base body includes a first portion and a second portion opposite and connected in a radial direction of the rotation shaft, the second base body includes a third portion and a fourth portion opposite and connected in the radial direction of the rotation shaft, the first ring member includes a fifth portion and a sixth portion opposite and connected in the radial direction of the rotation shaft, the second ring member includes a seventh portion and an eighth portion opposite and connected in the radial direction of the rotation shaft,
an outer peripheral surface of the fifth portion of the first ring member is continuous with an inner peripheral surface of the first portion of the first base, an outer peripheral surface of the sixth portion of the first ring member is continuous with an inner peripheral surface of the second portion of the first base,
an outer circumferential surface of the seventh portion of the second ring member is connected to an inner circumferential surface of the third portion of the second base, and an outer circumferential surface of the eighth portion of the second ring member is connected to an inner circumferential surface of the fourth portion of the second base.
In some embodiments, the permanent magnet includes a ninth portion and a tenth portion opposite and connected in a radial direction of the rotation shaft, the ninth portion of the permanent magnet being connected between the first portion of the first base and the third portion of the second base, and the tenth portion of the permanent magnet being connected between the second portion of the first base and the fourth portion of the second base.
In some embodiments, the magnetic liquid sealing device further includes a first magnetism isolating ring and a second magnetism isolating ring, the first magnetism isolating ring and the second magnetism isolating ring are disposed in the sealing cavity and are spaced apart from each other in an axial direction of the rotating shaft, a gap is formed between the first magnetism isolating ring and the rotating shaft, an outer circumferential surface of the first magnetism isolating ring and an outer circumferential surface of the second magnetism isolating ring are in contact with an inner circumferential surface of the housing, and the permanent magnet, the first pole shoe and the second pole shoe are disposed between the first magnetism isolating ring and the second magnetism isolating ring.
In some embodiments, the magnetic liquid sealing device further includes a first bearing and a second bearing, the first bearing and the second bearing are both sleeved on the rotating shaft, an outer circumferential surface of the first bearing and an outer circumferential surface of the second bearing are both in contact with an inner circumferential surface of the housing, the permanent magnet, the first pole shoe, the second pole shoe, the first magnetism isolating ring and the second magnetism isolating ring are all located between the first bearing and the second bearing, and the sealing cavity is formed between the first bearing, the rotating shaft, the housing and the second bearing.
In some embodiments, the first magnetism isolating ring comprises an eleventh part and a twelfth part which are opposite and connected in the radial direction of the rotating shaft, and the second magnetism isolating ring comprises a thirteenth part and a fourteenth part which are opposite and connected in the radial direction of the rotating shaft.
In some embodiments, the first bearing includes fifteenth and sixteenth portions opposed and connected in a radial direction of the rotation shaft, and the second bearing includes seventeenth and eighteenth portions opposed and connected in the radial direction of the rotation shaft.
In some embodiments, the housing includes a barrel, the cavity being formed in the barrel, the barrel including first and second ends oppositely disposed along a length thereof, the first end of the barrel being openly disposed to open the first end of the cavity, and an end cap disposed at the first end of the barrel to close the first end of the cavity.
In some embodiments, the housing includes nineteenth and twentieth portions that are diametrically opposed and connected about the axis of rotation.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic liquid sealing device according to an embodiment of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
Fig. 3 is a schematic structural diagram of a magnetic liquid sealing device according to an embodiment of the present invention, in which a rotating shaft is not shown.
Fig. 4 is a schematic structural diagram of a housing according to an embodiment of the present invention.
Reference numerals:
a magnetic liquid sealing device 001;
a housing 100; the nineteenth part 1001; a twentieth portion 1002; a cylindrical member 101; a first end 1011; a second end 1012; a flange 102; a connecting hole 1021; an end cap 103;
a cavity 110; a first through-hole 111; a second through-hole 112; a third through hole 113; a sealed cavity 120; a seal gap 130;
a rotating shaft 200;
a permanent magnet 300; a ninth portion 310; a tenth portion 320; a first pole piece 400; a first substrate 410; a first portion 411; a second portion 412; a first ring member 420; a fifth portion 421; a sixth portion 422; a first annular tooth 430; a first annular groove 440; a second pole piece 500; a second substrate 510; the third portion 511; a fourth portion 512; a second annular member 520; a seventh portion 521; an eighth portion 522; a second annular pole tooth 530; a second annular recess 540;
a first seal ring 610; a second seal ring 620; a first magnetism isolating ring 710; an eleventh portion 711; a twelfth part 712; a second magnetism isolating ring 720; a thirteenth part 721; a fourteenth portion 722; a first bearing 810; a fifteenth portion 811; a sixteenth portion 812; a second bearing 820; a seventeenth portion 821; an eighteenth portion 822.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 4, a magnetic liquid sealing apparatus 001 according to an embodiment of the present invention includes a housing 100, a rotation shaft 200, a first pole piece 400, a second pole piece 500, and a permanent magnet 300.
As shown in fig. 1, 3 and 4, the material of the casing 100 is a non-magnetic material, the casing 100 has a cavity 110, the cavity 110 includes a sealed cavity 120, and the sealed cavity 120 is filled with a magnetic liquid. The first end 1011 of the housing 100 (e.g., the left end of the housing 100 in fig. 1) is provided with a first through hole 111, and the second end 1012 (e.g., the right end of the housing 100 in fig. 1) is provided with a second through hole 112.
Further, as shown in fig. 1 and 3, the housing 100 includes a cylindrical member 101 and an end cap 103. A cavity 110 is formed in the barrel. The cap 103 has a third through hole 113, the outer peripheral wall of the cap 103 is connected to the inner wall surface of the first through hole 111, and the third through hole 113 is located in the first through hole 111.
Further, as shown in fig. 1 and 3, the cylindrical member 101 has a flange 102, the flange 102 is located on the outer circumferential surface of the cylindrical member 101, and the flange 102 has connection holes 1021 arranged at intervals, so that the housing 100 is fixed by the flange 102.
As shown in fig. 1, the material of the rotating shaft 200 is magnetic material. The rotating shaft 200 is disposed through the casing 100 along an axial direction (e.g., a left-right direction in fig. 1), and at least a portion of the rotating shaft 200 is located in the cavity 110. The axial direction of the rotation shaft 200 is substantially parallel to the longitudinal direction (left-right direction in fig. 1) of the housing 100, one end of the rotation shaft 200 (left end of the rotation shaft 200 in fig. 1) extends out of the housing 100 through the third through hole 113, and the other end of the rotation shaft 200 (right end of the rotation shaft 200 in fig. 1) extends out of the housing 100 through the second through hole 112.
As shown in fig. 1 and 2, the first pole piece 400 and the second pole piece 500 are located in the sealing cavity 120, and both the first pole piece 400 and the second pole piece 500 are sleeved on the rotating shaft 200, and the first pole piece 400 and the second pole piece 500 are arranged at intervals along the axial direction of the rotating shaft 200.
The first pole piece 400 includes a first base 410 and a first ring member 420, an outer circumferential surface of the first base 410 is in contact with an inner circumferential surface of the housing 100, the first ring member 420 is provided at an inner circumferential surface of the first base 410, and the inner circumferential surface of the first ring member 420 is provided with a plurality of first ring-shaped pole teeth 430 arranged at intervals in an axial direction of the rotating shaft 200.
The second pole piece 500 includes a second base 510 and a second ring member 520, an outer circumferential surface of the second base 510 is in contact with an inner circumferential surface of the housing 100, an outer circumferential surface of the second ring member 520 is connected to an inner circumferential surface of the second base 510, and an inner circumferential surface of the second ring member 520 is provided with a plurality of second ring-shaped pole teeth 530 arranged at intervals in an axial direction of the rotating shaft 200.
A seal gap 130 is formed between the inner surface of the first ring-shaped tooth 430 and the rotational shaft 200 and between the inner surface of the second ring-shaped tooth 530 and the rotational shaft 200, and the magnetic liquid is adapted to be adsorbed in the seal gap 130 by a magnetic force.
As shown in fig. 1 and 2, the permanent magnet 300 is also located in the sealed cavity 120, the permanent magnet 300 is sleeved on the rotating shaft 200, a gap is formed between the permanent magnet 300 and the rotating shaft 200, and the permanent magnet 300 is connected between the first substrate 410 and the second substrate 510. That is, the first ring member 420 is coupled to the first base 410, the second ring member 520 is coupled to the second base 510, and the permanent magnet 300 is not coupled to the first ring member 420 and the second ring member 520. The permanent magnet 300 does not affect the installation and the disassembly between the ring-shaped piece and the base body, and the ring-shaped piece and the base body can be normally connected and disassembled. Therefore, the utility model discloses only change or repair the loop forming element after magnetic liquid sealing device 001's the utmost point tooth wearing and tearing, use cost reduces.
According to the utility model discloses magnetic liquid sealing device 001's pole shoe is split type structure, and the pole shoe includes base member and loop forming element, and the internal surface at the loop forming element is established to the utmost point tooth, and whole pole shoe need not be changed after the utmost point tooth wearing and tearing, only needs to change or repair the loop forming element, the utility model discloses magnetic liquid sealing device 001's use cost reduces.
In some embodiments, the first ring member 420 may be connected to the inner circumferential surface of the first substrate 410 by 3D printing, and the second ring member 520 may be connected to the inner circumferential surface of the second substrate 510 by 3D printing. That is, the magnetic liquid sealing apparatus 001 according to the embodiment of the present invention prints the first ring member 420 on the inner circumferential surface of the first base 410 by 3D printing, and prints the first ring-shaped teeth 430 on the inner circumferential surface of the first ring member 420. The utility model discloses magnetic liquid sealing device 001 prints out second ring member 520 at the inner peripheral surface of second base member 510 through 3D printing, and prints out second ring-shaped pole tooth 530 at the inner peripheral surface of second ring member 520. It will be appreciated that the first and second ring members 420, 520 may be attached to the first and second substrates 410, 510, respectively, in other ways.
According to the utility model discloses magnetic liquid sealing device 001 replaces first ring-shaped polar tooth 430 of machining preparation and second ring-shaped polar tooth 530 through 3D printing, can improve the machining precision of first ring-shaped polar tooth 430 and second ring-shaped polar tooth 530, and then can slow down the wearing and tearing of first ring-shaped polar tooth 430 and second ring-shaped polar tooth 530. Additionally, the utility model discloses magnetic liquid sealing device 001 of embodiment also makes things convenient for first ring gear 430 and second ring gear 530 to repair and adjust through 3D printing. Therefore, the utility model discloses magnetic liquid sealing device 001's pole teeth needn't change whole pole shoe after wearing and tearing, use cost reduces.
In some embodiments, the cross-section of the first and second annular teeth 430, 530 is rectangular, triangular, saw-tooth, or trapezoidal. As shown in fig. 1 and 2, the cross section is a section of the first annular tooth 430 and the second annular tooth 530 in the axial direction of the rotating shaft 200. That is, the cross-section is generally parallel to the axis of the shaft 200. It is understood that the cross-section of the first and second annular teeth 430, 530 can be other shapes depending on the application.
Further, the utility model discloses magnetic liquid sealing device 001 utilizes 3D to print can be according to the complicated utmost point tooth shape of application demand processing, can increase this magnetic liquid sealing device 001's range of application. That is, different application scenarios correspond to different tooth shapes. Specifically, the utility model discloses magnetic liquid sealing device 001 can adjust and control the magnetic field distribution in the seal clearance 130 according to the shape of utmost point tooth, improves this magnetic liquid sealing device 001's pressure resistance and life.
In some embodiments, as shown in fig. 1 and 2, the magnetic fluid sealing device 001 further comprises a first sealing ring 610 and a second sealing ring 620, the outer circumferential surface of the first base 410 is provided with a first annular groove 440, and the outer circumferential surface of the second base 510 is provided with a second annular groove 540. The first seal ring 610 is fitted in the first annular groove 440, and the first seal ring 610 is in contact with the inner circumferential surface of the housing 100. The second sealing ring 620 is fitted in the second annular groove 540, and the second sealing ring 620 is in contact with the inner circumferential surface of the housing 100. Thus, the first seal ring 610 can seal the gap between the outer peripheral surface of the first base 410 and the inner peripheral surface of the cylindrical material 101, and the second seal ring 620 can seal the gap between the outer peripheral surface of the second base 510 and the inner peripheral surface of the cylindrical material 101.
In some embodiments, as shown in FIG. 3, the first base 410 includes a first portion 411 and a second portion 412 that are diametrically opposed and connected to each other about the axis of rotation 200. The second base 510 includes a third portion 511 and a fourth portion 512 opposite and connected in the radial direction of the rotation shaft 200. The first ring member 420 includes a fifth portion 421 and a sixth portion 422 opposite and connected in the radial direction of the rotation shaft 200. The second ring 520 includes a seventh portion 521 and an eighth portion 522 opposite and connected in the radial direction of the rotation shaft 200. The embodiment of the present invention provides a magnetic liquid sealing device 001, which is used for detaching the first pole piece 400 and the second pole piece 500 without detaching other components of the rotating shaft 200, and only needs to detach the first portion 411 and the second portion 412 of the first base body 410, and detach the third portion 511 and the fourth portion 512 of the second base body 510. Therefore, the magnetic liquid sealing device 001 of the embodiment of the present invention facilitates the installation and the removal of the first pole piece 400 and the second pole piece 500.
Further, the first and second portions 411 and 412 of the first base body 410 are symmetrical to each other in the radial direction of the rotation shaft 200, the third and fourth portions 511 and 512 of the second base body 510 are symmetrical to each other in the radial direction of the rotation shaft 200, the fifth and sixth portions 421 and 422 of the first ring member 420 are symmetrical to each other in the radial direction of the rotation shaft 200, and the seventh and eighth portions 521 and 522 of the second ring member 520 are symmetrical to each other in the radial direction of the rotation shaft 200.
That is, the first portion 411 is one half of the first substrate 410, and the second portion 412 is the other half of the first substrate; the third portion 511 is one half of the second substrate 510, and the fourth portion 512 is the other half of the second substrate; the fifth portion 421 is one half of the first ring member 420, and the sixth portion 422 is the other half of the first ring member; the seventh portion 521 is one half of the second ring member 520, and the eighth portion 522 is the other half of the second ring member 520.
Specifically, the first portion 411 and the second portion 412 and the third portion 511 and the fourth portion 512 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
Further, the outer circumferential surface of the fifth portion 421 of the first ring member 420 is connected to the inner circumferential surface of the first portion 411 of the first base 410, and the outer circumferential surface of the sixth portion 422 of the first ring member 420 is connected to the inner circumferential surface of the second portion 412 of the first base 410. The outer circumferential surface of the seventh portion 521 of the second ring member 520 is connected to the inner circumferential surface of the third portion 511 of the second base 510, and the outer circumferential surface of the eighth portion 522 of the second ring member 520 is connected to the inner circumferential surface of the fourth portion 512 of the second base 510.
That is, the first portion 411 of the first base body 410 is connected to the fifth portion 421 of the first ring member 420, and the second portion 412 of the first base body 410 is connected to the sixth portion 422 of the first ring member 420. The third portion 511 of the second base 510 is connected to the seventh portion 521 of the second ring member 520, and the fourth portion 512 of the second base 510 is connected to the eighth portion 522 of the second ring member 520. In other words, the fifth portion 421 of the first ring member 420 is attached and detached together with the first portion 411 of the first base 410, and the sixth portion 422 of the first ring member 420 is attached and detached together with the second portion 412 of the first base 410. The seventh and eighth portions 521 and 522 of the second ring member 520 are attached and detached together with the third and fourth portions 511 and 512 of the second base 510. The utility model discloses magnetic liquid sealing device 001 of embodiment can carry out the integral erection and dismantle to first pole shoe 400 and second pole shoe 500. Therefore, when the pole teeth are worn, the magnetic liquid sealing device 001 of the embodiment of the present invention is convenient for repairing and adjusting the first ring-shaped member 420 and the second ring-shaped member 520, and does not need to integrally replace the first pole shoe 400 and the second pole shoe 500, thereby saving the use cost.
In some embodiments, as shown in fig. 3, the permanent magnet 300 includes a ninth portion 310 and a tenth portion 320 that are opposite and connected in the radial direction of the rotating shaft 200. The utility model discloses magnetic liquid sealing device 001 need not demolish other parts on the countershaft 200 when demolising permanent magnet 300, only needs to unpack the ninth portion 310 and the tenth portion 320 of permanent magnet 300 apart, can demolish permanent magnet 300. From this, the utility model discloses magnetic liquid sealing device 001 is convenient installs and dismantles permanent magnet 300.
Further, the ninth and tenth portions 310 and 320 of the permanent magnet 300 are symmetrical to each other in the radial direction of the rotation shaft 200. That is, the ninth portion 310 is one half of the permanent magnet 300, and the tenth portion 320 is the other half of the permanent magnet 300.
Specifically, the ninth portion 310 and the tenth portion 320 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
Further, the ninth portion 310 of the permanent magnet 300 is connected between the first portion 411 of the first base 410 and the third portion 511 of the second base 510, and the tenth portion 320 of the permanent magnet 300 is connected between the second portion 412 of the first base 410 and the fourth portion 512 of the second base 510. That is, the ninth portion 310 of the permanent magnet 300 is connected to both the first portion 411 of the first base 410 and the third portion 511 of the second base 510. The tenth part 320 of the permanent magnet 300 is connected to both the second part 412 of the first substrate 410 and the fourth part 512 of the second substrate 510. In other words, the ninth portion 310 of the permanent magnet 300 is mounted and dismounted along with the first portion 411 of the first base 410 and the third portion 511 of the second base 510, and the tenth portion 320 of the permanent magnet 300 is mounted and dismounted along with the second portion 412 of the first base 410 and the fourth portion 512 of the second base 510. Therefore, the permanent magnet 300 of the magnetic liquid sealing device 001 of the embodiment of the present invention does not obstruct the installation and disassembly of the first pole piece 400 and the second pole piece 500, and is convenient for repairing and adjusting the first ring-shaped piece 420 and the second ring-shaped piece 520, thereby saving the use cost.
In some embodiments, the magnetic fluid sealing apparatus 001 further includes a first magnetism isolating ring 710 and a second magnetism isolating ring 720, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are disposed in the sealing cavity 120 and are spaced apart from each other in the axial direction of the rotating shaft 200, a gap is formed between the first magnetism isolating ring 710 and the second magnetism isolating ring 720 and the rotating shaft 200, the outer circumferential surface of the first magnetism isolating ring 710 and the outer circumferential surface of the second magnetism isolating ring 720 are in contact with the inner circumferential surface of the casing 100, and the permanent magnet 300, the first pole piece 400, and the second pole piece 500 are disposed between the first magnetism isolating ring 710 and the second magnetism isolating ring 720.
As shown in fig. 1 and 3, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are arranged at left and right intervals, the permanent magnet 300, the first pole shoe 400 and the second pole shoe 500 are all located between the first magnetism isolating ring 710 and the second magnetism isolating ring 720, the first magnetism isolating ring 710 isolates the first pole shoe 400 from other parts, and the second magnetism isolating ring 720 isolates the second pole shoe 500 from other parts. Therefore, the magnetic liquid sealing device 001 of the embodiment of the present invention can avoid the leakage of the magnetic circuit between the permanent magnet 300, the first pole shoe 400, the rotating shaft 200 and the second pole shoe 500, so as to stabilize the magnetic field gradient in the sealing gap 130.
Further, as shown in fig. 3, the first magnetism isolating ring 710 includes an eleventh part 711 and a twelfth part 712 that are opposite and connected in the radial direction of the rotating shaft 200, and the second magnetism isolating ring 720 includes a thirteenth part 721 and a fourteenth part 722 that are opposite and connected in the radial direction of the rotating shaft 200. The embodiment of the utility model provides a magnetic fluid sealing device 001 need not demolish other parts on the countershaft 200 when demolising first magnetism isolating ring 710 and second magnetism isolating ring 720, only needs to unpack the eleventh part 711 and the twelfth part 712 of first magnetism isolating ring 710 apart, can demolish first magnetism isolating ring 710, unpacks the thirteenth part 721 and the fourteenth part 722 of second magnetism isolating ring 720 apart, can demolish second magnetism isolating ring 720. Therefore, the magnetic liquid sealing device 001 of the embodiment of the present invention is convenient to mount and dismount the first magnetism isolating ring 710 and the second magnetism isolating ring 720.
Further, the eleventh part 711 and the twelfth part 712 of the first magnetism isolating ring 710 are symmetrical to each other in the radial direction of the rotation shaft 200, and the thirteenth part 721 and the fourteenth part 722 of the second magnetism isolating ring 720 are symmetrical to each other in the radial direction of the rotation shaft 200. That is, the eleventh part 711 is a half of the first magnetism isolating ring 710, and the twelfth part 712 is the other half of the first magnetism isolating ring 710; the thirteenth part 721 is a half of the second magnetism isolating ring 720, and the fourteenth part 722 is the other half of the second magnetism isolating ring 720.
Specifically, the eleventh portion 711 and the twelfth portion 712 and the thirteenth portion 721 and the fourteenth portion 722 may be adhered by a sealant, or may be connected by a positioning pin or a bolt.
In some embodiments, the magnetic fluid sealing device 001 further includes a first bearing 810 and a second bearing 820, the first bearing 810 and the second bearing 820 are both sleeved on the rotating shaft 200, an outer circumferential surface of the first bearing 810 and an outer circumferential surface of the second bearing 820 are both in contact with an inner circumferential surface of the casing 100, the permanent magnet 300, the first pole shoe 400, the second pole shoe 500, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are all located between the first bearing 810 and the second bearing 820, and the sealing cavity 120 is formed between the first bearing 810, the rotating shaft 200, the casing 100 and the second bearing 820. Therefore, the magnetic liquid sealing device 001 according to the embodiment of the present invention rotatably penetrates the rotating shaft 200 through the first bearing 810 and the second bearing 820 on the casing 100.
As shown in fig. 1 and 3, the permanent magnet 300, the first pole piece 400, the second pole piece 500, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are all located between the first bearing 810 and the second bearing 820. The sealed chamber 120 is formed between the first bearing 810, the rotation shaft 200, the outer circumferential wall, and the second bearing 820. That is, the cavity 110 enclosed by the first bearing 810, the rotating shaft 200, the outer peripheral wall and the second bearing 820 is the sealed cavity 120, and the permanent magnet 300, the first pole shoe 400, the second pole shoe 500, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are all located in the sealed cavity 120.
Further, as shown in fig. 3, the first bearing 810 includes a fifteenth portion 811 and a sixteenth portion 812 opposite and connected in the radial direction of the rotation shaft 200, and the second bearing 820 includes a seventeenth portion 821 and an eighteenth portion 822 opposite and connected in the radial direction of the rotation shaft 200. The utility model discloses magnetic liquid sealing device 001 need not demolish other parts on the countershaft 200 when demolising first bearing 810 and second bearing 820, only needs to unpack the fifteenth part 811 and the sixteenth part 812 of first bearing 810 apart, can demolish first bearing 810, unpacks the seventeenth part 821 and the eighteenth part 822 of second magnetism isolating ring 720 apart, can demolish second magnetism isolating ring 720. Therefore, the magnetic liquid sealing device 001 of the embodiment of the present invention is convenient to mount and dismount the first bearing 810 and the second bearing 820.
Further, the fifteenth part 811 and the sixteenth part 812 of the first bearing 810 are symmetrical to each other in the radial direction of the rotation shaft 200, and the seventeenth part 821 and the eighteenth part 822 of the second bearing 820 are symmetrical to each other in the radial direction of the rotation shaft 200. That is, the fifteenth portion 811 is one half of the first bearing 810, and the sixteenth portion 812 is the other half of the first bearing 810; the seventeenth portion 821 is a half of the second bearing 820 and the eighteenth portion 822 is the other half of the second bearing 820.
Specifically, the fifteenth portion 811 and the sixteenth portion 812 and the seventeenth portion 821 and the eighteenth portion 822 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
In some embodiments, as shown in fig. 3 and 4, the housing 100 includes a nineteenth portion 1001 and a twentieth portion 1002 that are diametrically opposed and connected to each other on the shaft 200.
Further, the nineteenth and twentieth parts 1001 and 1002 of the housing 100 are symmetrical to each other in the radial direction of the rotation shaft 200. That is, the nineteenth part 1001 is one half of the housing 100, and the twentieth part 1002 is the other half of the housing 100.
Specifically, the nineteenth part 1001 and the twentieth part 1002 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
It can be understood that, the magnetic liquid sealing device 001 of the embodiment of the present invention does not need to take out the rotating shaft 200 from the casing 100 when installing or removing the components in the casing 100, and only needs to take apart the nineteenth part 1001 and the twentieth part 1002 of the casing 100, so as to expose the components installed on the rotating shaft 200 and the rotating shaft 200, thereby facilitating the installation or the removal of the components installed on the rotating shaft 200. Therefore, the magnetic liquid sealing device 001 of the embodiment of the present invention facilitates the installation and disassembly maintenance of the components in the housing 100.
In addition, the parts in the casing 100 of the magnetic liquid sealing device 001 according to the embodiment of the present invention do not need to be positioned by the rotating shaft 200 and the shoulder and the baffle on the rotating shaft 200 when being disassembled. Therefore, the utility model discloses the pivot 200 of magnetic liquid sealing device 001 of embodiment process into the optical axis can, reduced the processing degree of difficulty of pivot 200.
A specific exemplary magnetic liquid seal device 001 according to the present invention is described below with reference to the drawings.
As shown in fig. 1 to 4, a magnetic fluid sealing apparatus 001 according to an embodiment of the present invention includes a housing 100, a rotating shaft 200, a permanent magnet 300, a first pole shoe 400, a second pole shoe 500, a first magnetism isolating ring 710, a second magnetism isolating ring 720, a first bearing 810, a second bearing 820, a first sealing ring 610, and a second sealing ring 620.
The material of the shell 100 is a non-magnetic conductive material, the shell 100 has a cavity 110, the cavity 110 includes a sealed cavity 120, and the sealed cavity 120 is filled with a magnetic liquid. The housing 100 has a first through hole 111 at the left end and a second through hole 112 at the right end. The housing 100 includes a cylindrical member 101 and an end cap 103. A cavity 110 is formed in the barrel. The cap 103 has a third through hole 113, the outer peripheral wall of the cap 103 is connected to the inner wall surface of the first through hole 111, and the third through hole 113 is located in the first through hole 111. The cylindrical member 101 has a flange 102, the flange 102 is located on the outer circumferential surface of the cylindrical member 101, and the flange 102 has connection holes 1021 arranged at intervals so that the housing 100 is fixed by the flange 102.
The housing 100 includes a nineteenth part 1001 and a twentieth part 1002 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200. The nineteenth part 1001 and the twentieth part 1002 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
The material of the rotating shaft 200 is magnetic material. The rotation shaft 200 is provided on the housing 100 in the left-right direction, and at least a portion of the rotation shaft 200 is located in the cavity 110. The axial direction of the rotating shaft 200 is substantially parallel to the left-right direction, the left end of the rotating shaft 200 extends out of the housing 100 through the third through hole 113, and the right end of the rotating shaft 200 extends out of the housing 100 through the second through hole 112.
The first pole piece 400 and the second pole piece 500 are located in the sealing cavity 120, the first pole piece 400 and the second pole piece 500 are both sleeved on the rotating shaft 200, and the first pole piece 400 and the second pole piece 500 are arranged at left and right intervals. The first pole piece 400 includes a first base 410 and a first ring member 420, an outer circumferential surface of the first base 410 is in contact with an inner circumferential surface of the housing 100, the first ring member 420 is provided on an inner circumferential surface of the first base 410, and the inner circumferential surface of the first ring member 420 is provided with a plurality of first ring-shaped teeth 430 arranged at left and right intervals. The second pole piece 500 includes a second base 510 and a second ring member 520, an outer circumferential surface of the second base 510 is in contact with an inner circumferential surface of the housing 100, an outer circumferential surface of the second ring member 520 is connected to an inner circumferential surface of the second base 510, and an inner circumferential surface of the second ring member 520 is provided with a plurality of second ring-shaped pole teeth 530 arranged at left and right intervals. The first and second annular teeth 430, 530 are rectangular in cross-section. Seal gaps 130 are formed between the inner surface of the first annular tooth 430 and the rotational shaft 200 and between the inner surface of the second annular tooth 530 and the rotational shaft 200, and the magnetic liquid is adapted to be attracted into the seal gaps 130 by a magnetic force.
The permanent magnet 300 is also located in the sealed cavity 120, the permanent magnet 300 is sleeved on the rotating shaft 200, a gap is formed between the permanent magnet 300 and the rotating shaft 200, and the permanent magnet 300 is connected between the first substrate 410 and the second substrate 510.
The first ring member 420 may be connected to the inner circumferential surface of the first base 410 by 3D printing, and the second ring member 520 may be connected to the inner circumferential surface of the second base 510 by 3D printing.
The first base 410 has a first annular groove 440 formed on an outer circumferential surface thereof, and the second base 510 has a second annular groove 540 formed on an outer circumferential surface thereof. The first seal ring 610 is fitted in the first annular groove 440, and the first seal ring 610 is in contact with the inner circumferential surface of the housing 100. The second sealing ring 620 is fitted in the second annular groove 540, and the second sealing ring 620 is in contact with the inner circumferential surface of the housing 100.
The first base 410 includes a first portion 411 and a second portion 412 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200, and the second base 510 includes a third portion 511 and a fourth portion 512 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200. The first ring member 420 includes fifth and sixth portions 421 and 422 symmetrical to each other in the radial direction of the rotation shaft 200, and the second ring member 520 includes seventh and eighth portions 521 and 522 symmetrical to each other in the radial direction of the rotation shaft 200.
The first portion 411 and the second portion 412 and the third portion 511 and the fourth portion 512 may be adhered by a sealant, or may be connected by a positioning pin or a bolt. The outer circumferential surface of the fifth portion 421 of the first ring member 420 is connected to the inner circumferential surface of the first portion 411 of the first base 410, and the outer circumferential surface of the sixth portion 422 of the first ring member 420 is connected to the inner circumferential surface of the second portion 412 of the first base 410. The outer circumferential surface of the seventh portion 521 of the second ring member 520 is connected to the inner circumferential surface of the third portion 511 of the second base 510, and the outer circumferential surface of the eighth portion 522 of the second ring member 520 is connected to the inner circumferential surface of the fourth portion 512 of the second base 510.
The permanent magnet 300 includes a ninth portion 310 and a tenth portion 320 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200. The ninth portion 310 and the tenth portion 320 may be adhered by a sealant, or may be connected by a positioning pin or a bolt. The ninth portion 310 of the permanent magnet 300 is connected between the first portion 411 of the first base 410 and the third portion 511 of the second base 510, and the tenth portion 320 of the permanent magnet 300 is connected between the second portion 412 of the first base 410 and the fourth portion 512 of the second base 510.
The first magnetism isolating ring 710 and the second magnetism isolating ring 720 are arranged in the sealed cavity 120 at intervals from left to right, a gap is formed between the first magnetism isolating ring 710 and the rotating shaft 200 and between the second magnetism isolating ring 720 and the rotating shaft 200, the outer peripheral surface of the first magnetism isolating ring 710 and the outer peripheral surface of the second magnetism isolating ring 720 are in contact with the inner peripheral surface of the shell 100, and the permanent magnet 300, the first pole shoe 400 and the second pole shoe 500 are all located between the first magnetism isolating ring 710 and the second magnetism isolating ring 720. The first magnetism isolating ring 710 and the second magnetism isolating ring 720 are arranged at left and right intervals, the permanent magnet 300, the first pole shoe 400 and the second pole shoe 500 are all located between the first magnetism isolating ring 710 and the second magnetism isolating ring 720, the first magnetism isolating ring 710 isolates the first pole shoe 400 from other parts, and the second magnetism isolating ring 720 isolates the second pole shoe 500 from other parts.
The first magnetism isolating ring 710 includes an eleventh part 711 and a twelfth part 712 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200, and the second magnetism isolating ring 720 includes a thirteenth part 721 and a fourteenth part 722 that are symmetrical to and connected to each other in the radial direction of the rotation shaft 200. The eleventh part 711 and the twelfth part 712 and the thirteenth part 721 and the fourteenth part 722 can be adhered by a sealant, or can be connected by a positioning pin or a bolt.
The first bearing 810 and the second bearing 820 are sleeved on the rotating shaft 200, the outer circumferential surface of the first bearing 810 and the outer circumferential surface of the second bearing 820 are in contact with the inner circumferential surface of the shell 100, the permanent magnet 300, the first pole shoe 400, the second pole shoe 500, the first magnetism isolating ring 710 and the second magnetism isolating ring 720 are located between the first bearing 810 and the second bearing 820, and the sealing cavity 120 is formed among the first bearing 810, the rotating shaft 200, the shell 100 and the second bearing 820. The first bearing 810 includes a fifteenth part 811 and a sixteenth part 812 which are symmetrical to each other in the radial direction of the rotation shaft 200 and connected to each other, and the second bearing 820 includes a seventeenth part 821 and an eighteenth part 822 which are symmetrical to each other in the radial direction of the rotation shaft 200 and connected to each other. The fifteenth portion 811 and the sixteenth portion 812 and the seventeenth portion 821 and the eighteenth portion 822 may be bonded by a sealant, or may be connected by a positioning pin or a bolt.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (12)
1. A magnetic fluid seal assembly, comprising:
the shell is made of a non-magnetic conductive material and provided with a cavity, the cavity comprises a sealed cavity, and magnetic liquid is filled in the sealed cavity;
the rotating shaft is made of magnetic conductivity materials, the rotating shaft penetrates through the shell along the axial direction of the rotating shaft, at least part of the rotating shaft is located in the cavity, and the axial direction of the rotating shaft is approximately parallel to the length direction of the shell;
the first pole shoe and the second pole shoe are positioned in the sealing cavity, the first pole shoe and the second pole shoe are sleeved on the rotating shaft, the first pole shoe and the second pole shoe are arranged along the axial direction of the rotating shaft at intervals, the first pole shoe comprises a first base body and a first annular piece, the outer peripheral surface of the first base body is in contact with the inner peripheral surface of the shell, the first annular piece is arranged on the inner peripheral surface of the first base body, the inner peripheral surface of the first annular piece is provided with a plurality of first annular pole teeth arranged along the axial direction of the rotating shaft at intervals, the second pole shoe comprises a second base body and a second annular piece, the outer peripheral surface of the second base body is in contact with the inner peripheral surface of the shell, the outer peripheral surface of the second annular piece is connected with the inner peripheral surface of the second base body, and the inner peripheral surface of the second annular piece is provided with a plurality of second annular pole teeth arranged along the axial direction of the rotating shaft at intervals, a sealing gap is formed between the inner surface of the first annular pole tooth and the rotating shaft and between the inner surface of the second annular pole tooth and the rotating shaft, and the magnetic liquid is suitable for being adsorbed in the sealing gap under the action of magnetic force;
the permanent magnet, the permanent magnet is located in the sealed intracavity, just the permanent magnet cover is established in the pivot, the permanent magnet with the clearance has between the pivot, the permanent magnet is connected first base member with between the second base member.
2. The magnetic fluid seal of claim 1 wherein said first and second annular teeth are rectangular, triangular, saw-toothed or trapezoidal in cross-section.
3. The magnetic liquid sealing device according to claim 1, wherein the first annular member is connectable to the inner peripheral surface of the first base body by 3D printing, and the second annular member is connectable to the inner peripheral surface of the second base body by 3D printing.
4. The magnetic liquid seal device according to claim 1, further comprising a first seal ring and a second seal ring, wherein the outer peripheral surface of the first base body is provided with a first annular groove, and the outer peripheral surface of the second base body is provided with a second annular groove;
the first sealing ring is matched in the first annular groove and is contacted with the inner circumferential surface of the shell,
the second sealing ring is matched in the second annular groove and is in contact with the inner circumferential surface of the shell.
5. The magnetic liquid seal device according to claim 1, wherein the first base body includes a first portion and a second portion opposed to and connected to each other in a radial direction of the rotation shaft, the second base body includes a third portion and a fourth portion opposed to and connected to each other in the radial direction of the rotation shaft, the first ring member includes a fifth portion and a sixth portion opposed to and connected to each other in the radial direction of the rotation shaft, the second ring member includes a seventh portion and an eighth portion opposed to and connected to each other in the radial direction of the rotation shaft,
an outer peripheral surface of the fifth portion of the first ring member is continuous with an inner peripheral surface of the first portion of the first base, an outer peripheral surface of the sixth portion of the first ring member is continuous with an inner peripheral surface of the second portion of the first base,
an outer circumferential surface of the seventh portion of the second ring member is connected to an inner circumferential surface of the third portion of the second base, and an outer circumferential surface of the eighth portion of the second ring member is connected to an inner circumferential surface of the fourth portion of the second base.
6. The magnetic fluid seal apparatus of claim 5, wherein said permanent magnet includes a ninth portion and a tenth portion opposite and connected in a radial direction of said rotation shaft, said ninth portion of said permanent magnet being connected between said first portion of said first substrate and said third portion of said second substrate, said tenth portion of said permanent magnet being connected between said second portion of said first substrate and said fourth portion of said second substrate.
7. The magnetic fluid sealing device according to claim 1, further comprising a first magnetism isolating ring and a second magnetism isolating ring, wherein the first magnetism isolating ring and the second magnetism isolating ring are disposed in the sealing cavity and are spaced apart from each other in an axial direction of the rotating shaft, a gap is formed between the first magnetism isolating ring and the rotating shaft, an outer circumferential surface of the first magnetism isolating ring and an outer circumferential surface of the second magnetism isolating ring contact an inner circumferential surface of the housing, and the permanent magnet, the first pole shoe and the second pole shoe are disposed between the first magnetism isolating ring and the second magnetism isolating ring.
8. The magnetic fluid seal apparatus of claim 7, further comprising a first bearing and a second bearing, wherein the first bearing and the second bearing are both disposed on the rotating shaft, an outer circumferential surface of the first bearing and an outer circumferential surface of the second bearing are both in contact with an inner circumferential surface of the housing, the permanent magnet, the first pole shoe, the second pole shoe, the first magnetic isolating ring and the second magnetic isolating ring are all located between the first bearing and the second bearing, and the seal cavity is formed between the first bearing, the rotating shaft, the housing and the second bearing.
9. The magnetic fluid seal apparatus according to claim 7, wherein said first magnetism isolating ring includes an eleventh portion and a twelfth portion opposite to and connected to each other in a radial direction of said rotation shaft, and said second magnetism isolating ring includes a thirteenth portion and a fourteenth portion opposite to and connected to each other in the radial direction of said rotation shaft.
10. The magnetic fluid seal apparatus of claim 8, wherein the first bearing includes fifteenth and sixteenth portions that are opposed and connected in a radial direction of the rotation shaft, and the second bearing includes seventeenth and eighteenth portions that are opposed and connected in a radial direction of the rotation shaft.
11. The magnetic fluid seal apparatus of any one of claims 1 to 10 wherein said housing includes a cylindrical member and an end cap, said cavity being formed in said cylindrical member, said cylindrical member including first and second ends disposed in opposition along its length, said first end of said cylindrical member being openly disposed to open a first end of said cavity, said end cap being disposed at a first end of said cylindrical member to close said first end of said cavity.
12. The magnetic fluid seal apparatus of claim 11, wherein said housing includes nineteenth and twentieth portions that are diametrically opposed and connected to each other on said axis of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022766744.8U CN214146601U (en) | 2020-11-25 | 2020-11-25 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022766744.8U CN214146601U (en) | 2020-11-25 | 2020-11-25 | Magnetic liquid sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN214146601U true CN214146601U (en) | 2021-09-07 |
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| CN202022766744.8U Active CN214146601U (en) | 2020-11-25 | 2020-11-25 | Magnetic liquid sealing device |
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| CN (1) | CN214146601U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483638A (en) * | 2022-02-28 | 2022-05-13 | 浙江省机电设计研究院有限公司 | Magnetic liquid sealing device for centrifugal pump |
-
2020
- 2020-11-25 CN CN202022766744.8U patent/CN214146601U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483638A (en) * | 2022-02-28 | 2022-05-13 | 浙江省机电设计研究院有限公司 | Magnetic liquid sealing device for centrifugal pump |
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