CN112963547A - Magnetic liquid heat insulation sealing device - Google Patents
Magnetic liquid heat insulation sealing device Download PDFInfo
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- CN112963547A CN112963547A CN202110309294.6A CN202110309294A CN112963547A CN 112963547 A CN112963547 A CN 112963547A CN 202110309294 A CN202110309294 A CN 202110309294A CN 112963547 A CN112963547 A CN 112963547A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention relates to the technical field of mechanical sealing, in particular to a magnetic liquid heat-insulating sealing device. The magnetic liquid heat insulation sealing device comprises a shell, a rotating shaft, a heat insulation sleeve, a shaft sleeve, a permanent magnet and a pole shoe, wherein the shell limits a cavity, the rotating shaft is rotatably arranged in the cavity, and the shell is provided with a first end part and a second end part which are opposite in the axial direction of the rotating shaft. The heat insulating sleeve is sleeved on the outer side of the rotating shaft and connected with the rotating shaft. The shaft sleeve is sleeved on the outer side of the heat insulation sleeve, the permanent magnet is sleeved on the outer side of the rotating shaft, the pole shoe is sleeved on the outer side of the shaft sleeve, the inner circumferential surface of the pole shoe and the outer circumferential surface of the shaft sleeve are spaced in the radial direction of the rotating shaft to form a sealing gap, and magnetic liquid is filled in the sealing gap. The magnetic liquid heat-insulation sealing device provided by the embodiment of the invention has the advantages of good sealing effect in a high-temperature environment, long service life and the like.
Description
Technical Field
The invention relates to the technical field of mechanical sealing, in particular to a magnetic liquid heat-insulating sealing device.
Background
Magnetic liquid seals are widely used in more and more industries as a sealing method capable of achieving 'zero leakage'. The working principle is that under the action of magnetic field generated by permanent magnet, the magnetic liquid placed between rotating shaft and gap of top end of pole tooth is concentrated to form an O-shaped ring, so that the gap channel is blocked to attain the goal of sealing.
In the high and new technical fields of aerospace and the like, moving parts such as rotating shafts, control surfaces and the like are often required to be sealed in a high-temperature environment. For example, cabin doors and landing gear parts of hypersonic aircrafts are flushed by high-temperature airflow during working, the temperature of a sealing part can reach thousands of degrees, and hot airflow is required not to enter the inside of the aircraft body, so that the working of low-temperature electromechanical parts is influenced. The magnetic liquid base carrier liquid used by the traditional magnetic liquid sealing structure is generally an organic compound, can bear the temperature of not more than 200 ℃, can not be used under the working conditions, and the magnetic liquid can have the problems of volatilization of the base carrier liquid, particle coagulation, reduction of magnetization intensity and the like under the high-temperature environment, thereby reducing the sealing effect and prolonging the service life.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, the embodiment of the invention provides a magnetic liquid heat insulation sealing device suitable for being used in a high-temperature environment.
The magnetic liquid heat insulation sealing device according to the embodiment of the invention comprises:
a housing defining a chamber;
the rotating shaft is rotatably arranged in the cavity, and the shell is provided with a first end part and a second end part which are opposite in the axial direction of the rotating shaft;
the heat insulation sleeve is sleeved on the outer side of the rotating shaft and is connected with the rotating shaft;
the shaft sleeve is sleeved outside the heat insulation sleeve;
the permanent magnet is sleeved on the outer side of the rotating shaft; and
the pole shoe is sleeved on the outer side of the shaft sleeve, the inner circumferential surface of the pole shoe and the outer circumferential surface of the shaft sleeve are spaced in the radial direction of the rotating shaft to form a sealing gap, and magnetic liquid is filled in the sealing gap.
The magnetic liquid heat-insulation sealing device provided by the embodiment of the invention has the advantages of good sealing effect in a high-temperature environment, long service life and the like.
In some embodiments, the sleeve is made of a flexible material.
In some embodiments, the shaft is a stepped shaft including a first section and a second section, the first section being disposed adjacent to the first end portion relative to the second section in an axial direction of the shaft, the first section having a diameter smaller than a diameter of the second section, the heat insulating sleeve being opposite to the first section in a radial direction of the shaft;
the shaft sleeve comprises a third section and a fourth section, the third section is arranged close to the first end relative to the fourth section in the axial direction of the rotating shaft, the third section is opposite to the heat insulation sleeve in the radial direction of the rotating shaft, the fourth section is opposite to the second section in the radial direction of the rotating shaft, and the inner circumferential surface of the fourth section is attached to the outer circumferential surface of the second section.
In some embodiments, the inner circumferential surface of the third section is attached to the outer circumferential surface of the heat insulating sleeve so as to clamp the heat insulating sleeve through the rotating shaft and the sleeve in the radial direction of the rotating shaft.
In some embodiments, a shoulder is provided on the shaft, the second section is located between the first section and the shoulder in the axial direction of the shaft, and an end of the fourth section, which is far away from the third section in the axial direction of the shaft, abuts against the shoulder.
In some embodiments, further comprising:
a first bearing and a second bearing, each of the pole piece and the permanent magnet being located between the first bearing and the second bearing in an axial direction of the rotating shaft, the first bearing being disposed adjacent the first end relative to the second bearing in the axial direction of the rotating shaft; and
the heat insulation ring is sleeved on the outer side of the rotating shaft and is located between the pole shoe and the first bearing in the axial direction of the rotating shaft.
In some embodiments, the thermal isolation ring is a ceramic ring.
In some embodiments, further comprising:
the magnetism isolating ring is sleeved on the outer side of the rotating shaft, is positioned between the pole shoe and the second bearing in the axial direction of the rotating shaft, and is positioned between the permanent magnet and the second bearing in the axial direction of the rotating shaft.
In some embodiments, the pole pieces include a first pole piece and a second pole piece, the first pole piece and the second pole piece being disposed at a spacing along an axial direction of the shaft;
the shaft sleeve is sleeved with the baffle plate, the baffle plate is connected with the shaft sleeve, and the baffle plate is located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft.
In some embodiments, the partition plate has a first portion connected to the shaft sleeve and a second portion connected to the first portion, the second portion being spaced apart from the shaft sleeve in a radial direction of the rotating shaft, and the first portion, the second portion and the shaft sleeve enclose a receiving chamber opening toward the first pole piece.
Drawings
Fig. 1 is a schematic structural view of a magnetic liquid heat-insulating sealing device according to an embodiment of the present invention.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is a schematic view of the structure of fig. 1 at the partition of the magnetic liquid heat-insulating sealing device according to another embodiment of the present invention.
Reference numerals: a magnetic liquid heat-insulating sealing device 100; a housing 1; a main body 101; a second stop surface 1011; an end cap 102; a first stop surface 1021; a chamber 103; a first end portion 104; a second end 105; a rotating shaft 2; a first segment 201; a second section 202; a shoulder 203; a first pole piece 3; a first pole tooth 301; a second pole piece 4; a second tooth 401; a permanent magnet 5; a heat insulating sleeve 6; a shaft sleeve 7; a third section 701; a fourth segment 702; a first seal ring 8; a second seal ring 9; a first bearing 11; a second bearing 12; a heat insulating ring 13; a magnetism isolating ring 14; a magnetic liquid 15; a first retainer ring 16; a second retainer 17; a partition 18; a first portion 181; a second portion 182; housing chamber 183.
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 illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 3, a magnetic liquid heat-insulating sealing device 100 according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, a heat-insulating sleeve 6, a shaft sleeve 7, a permanent magnet 5, and a pole piece.
The housing 1 defines a chamber 103, the rotary shaft 2 is rotatably provided in the chamber 103, and the housing 1 has a first end portion 104 and a second end portion 105 opposite in the axial direction of the rotary shaft 2. The heat insulation sleeve 6 is sleeved on the outer side of the rotating shaft 2, and the heat insulation sleeve 6 is connected with the rotating shaft 2. The shaft sleeve 7 is sleeved outside the heat insulation sleeve 6. The permanent magnet 5 is sleeved outside the rotating shaft 2. The pole shoe is sleeved outside the shaft sleeve 7, the inner circumferential surface of the pole shoe and the outer circumferential surface of the shaft sleeve 7 are spaced in the radial direction of the rotating shaft 2 to form a sealing gap, and the sealing gap is filled with magnetic liquid 15.
In the related art, when the magnetic liquid sealing device is installed on a device for use, and a rotating shaft, a control surface, and other moving parts of the device are sealed by the magnetic liquid sealing device, if the temperature of the device side is high or the temperature of the device side suddenly rises to a high temperature, the device may transfer a large amount of heat to the sealing gap through the rotating shaft, resulting in a high temperature of the magnetic liquid in the sealing gap. In the related art, the base carrier liquid of the magnetic liquid is generally an organic compound, the bearable temperature is not more than 200 ℃, when the temperature of the magnetic liquid is too high, the problems of volatilization, particle coagulation, reduction of magnetization intensity and the like of the base carrier liquid can occur, the sealing effect of the magnetic liquid sealing device is reduced, and the service life of the magnetic liquid sealing device is prolonged.
The magnetic liquid heat-insulation sealing device 100 according to the embodiment of the invention is installed on a device for use, for example, the first end 104 of the housing 1 is connected to the device, and when the temperature of the device side is high, the heat of the device side is firstly transmitted to the heat-insulation sleeve 6 through the rotating shaft 2, then transmitted to the shaft sleeve 7 through the heat-insulation sleeve 6, and then transmitted to the magnetic liquid 15 through the shaft sleeve 7. Due to the heat insulation effect of the heat insulation sleeve 6, heat transmitted to the shaft sleeve 7 is greatly reduced, the temperature at the position of the sealing gap is not too high, the temperature of the magnetic liquid 15 is not too high, the magnetic liquid 15 is in a proper temperature range, and the problems of volatilization of base carrier liquid, particle coagulation, reduction of magnetization intensity and the like can be reduced or avoided.
Therefore, the sealing effect of the magnetic liquid heat-insulating sealing device 100 can be improved, and the service life of the magnetic liquid heat-insulating sealing device 100 can be prolonged.
Therefore, the magnetic liquid heat insulation sealing device 100 according to the embodiment of the invention has the advantages of good sealing effect in a high-temperature environment, long service life and the like.
The magnetic liquid heat-insulating sealing device 100 according to the embodiment of the present invention will be described in detail below by taking fig. 1 to 3 as an example.
The magnetic liquid heat insulation sealing device 100 of the embodiment of the invention comprises a shell 1, a rotating shaft 2, a heat insulation sleeve 6, a shaft sleeve 7, a permanent magnet 5 and a pole shoe.
The housing 1 defines a chamber 103, the rotary shaft 2 is rotatably provided in the chamber 103, and the housing 1 has a first end portion 104 and a second end portion 105 opposite in the axial direction of the rotary shaft 2. The heat insulation sleeve 6 is sleeved on the outer side of the rotating shaft 2, and the heat insulation sleeve 6 is connected with the rotating shaft 2. The shaft sleeve 7 is sleeved outside the heat insulation sleeve 6. The permanent magnet 5 is sleeved outside the rotating shaft 2. The pole shoe is sleeved outside the shaft sleeve 7, the inner circumferential surface of the pole shoe and the outer circumferential surface of the shaft sleeve 7 are spaced in the radial direction of the rotating shaft 2 to form a sealing gap, and the sealing gap is filled with magnetic liquid 15.
In some embodiments, as shown in fig. 1, the housing 1 includes a main body 101 and an end cap 102, the main body 101 having a first end and a second end opposite in the axial direction of the rotation shaft 2, the end cap 102 being provided on the first end of the main body 101. A first end of the body 101 forms a first end 104 of the housing 1 and a second end of the body 101 forms a second end 105 of the housing 1. The first end of the main body 101 is used for connecting with equipment, such as doors, landing gear and the like of an aircraft, so that the magnetic liquid heat-insulating sealing device 100 is installed on the equipment for use to seal the equipment.
For example, as shown in fig. 1, the axial direction of the rotating shaft 2 coincides with the left-right direction, which is indicated by an arrow C in fig. 1, and the end cap 102 is provided on the left end portion of the main body 101.
The rotating shaft 2 is easy to generate thermal deformation under a high-temperature loaded state, and if the heat insulation sleeve 6 is made of brittle materials such as silicate ceramics, on one hand, the heat insulation sleeve 6 is difficult to be stably assembled with the rotating shaft 2 in the working process of the magnetic liquid heat insulation sealing device 100; on the other hand, frequent starting and stopping of the magnetic liquid heat insulation sealing device 100 can also cause thermal expansion and cold contraction of the heat insulation sleeve 6, so that the heat insulation sleeve 6 generates internal stress; in addition, the bearing condition of the rotating shaft 2 is changed to form impact vibration, and the impact vibration is transmitted to the heat insulation sleeve 6. The above factors act together to easily cause the thermal insulation sleeve 6 to be damaged and fail, so that more heat of the rotating shaft 2 is transferred to the sealing gap, and further the temperature of the magnetic liquid 15 is higher.
Preferably, the insulating sleeve 6 is made of a flexible material. For example, the insulating jacket 6 is woven or extruded from a fibrous material having a low thermal conductivity. From this, heat insulating sleeve 6 has compression and resilience ability, and heat insulating sleeve 6 can adapt to the deflection of pivot 2, makes the sealed clearance between utmost point tooth and the axle sleeve 7 keep even, and has the buffering ability of inhaling, avoids pivot 2 to lead to heat insulating sleeve 6 to destroy when taking place thermal deformation and receiving the shock vibration, and utmost point tooth collides with axle sleeve 7, aggravates the problem of wearing and tearing. The sealing effect of the magnetic liquid heat-insulation sealing device 100 can be further improved, and the service life of the magnetic liquid heat-insulation sealing device 100 can be prolonged.
In some embodiments, the shaft 2 is a stepped shaft including a first section 201 and a second section 202, the first section 201 is disposed adjacent to the first end 104 relative to the second section 202 in an axial direction of the shaft 2, a diameter of the first section 201 is smaller than a diameter of the second section 202, and the heat insulating jacket 6 is opposite to the first section 201 in a radial direction of the shaft 2. The sleeve 7 includes a third section 701 and a fourth section 702, the third section 701 is disposed adjacent to the first end 104 relative to the fourth section 702 in the axial direction of the rotating shaft 2, the third section 701 is opposite to the heat insulating sleeve 6 in the radial direction of the rotating shaft 2, the fourth section 702 is opposite to the second section 202 in the radial direction of the rotating shaft 2, and the inner circumferential surface of the fourth section 702 is attached to the outer circumferential surface of the second section 202.
Because the rotating shaft 2 and the shaft sleeve 7 are generally made of rigid materials, the inner circumferential surface of the fourth section 702 of the shaft sleeve 7 is attached to the outer circumferential surface of the second section 202 of the rotating shaft 2, and the second section 202 of the rotating shaft 2 can be used for radially positioning the shaft sleeve 7, so that the shaft sleeve 7 is prevented from radially shaking along the rotating shaft 2 when the magnetic liquid heat-insulating sealing device 100 works.
Therefore, when the magnetic liquid heat insulation sealing device 100 works, the distance between the shaft sleeve 7 and the pole teeth of the pole shoe can be kept in a stable range, and the working stability and the sealing performance of the magnetic liquid heat insulation sealing device 100 are improved.
It should be noted that the heat transferred to the rotating shaft 2 by the apparatus is gradually reduced along the axial direction of the rotating shaft 2, so that the temperature of the rotating shaft 2 near the first end 104 is higher, and the temperature of the rotating shaft 2 near the second end 105 is not too high, i.e. the temperature of the first section 201 of the rotating shaft 2 is higher, and the temperature of the second section 202 of the rotating shaft 2 is not too high. Therefore, even if the inner peripheral surface of the fourth section 702 of the shaft sleeve 7 is attached to the outer peripheral surface of the second section 202 of the rotating shaft 2, the temperature of the fourth section 702 of the shaft sleeve 7 is not too high, and the temperature of the magnetic liquid 15 at the fourth section 702 of the shaft sleeve 7 is not too high, which will not affect the sealing effect and the service life of the magnetic liquid heat-insulating sealing device 100.
Of course, in other embodiments, the sleeve 7 may be opposite to the heat insulating sleeve 6 in the radial direction of the rotating shaft 2.
In some embodiments, the inner circumferential surface of the third section 701 abuts against the outer circumferential surface of the heat insulating jacket 6 so as to clamp the heat insulating jacket 6 in the radial direction of the shaft 2 through the shaft 2 and the sleeve 7. In other words, the heat insulating sleeve 6 is sandwiched and fixed between the rotary shaft 2 and the sleeve 7.
Therefore, the heat insulation sleeve 6 is conveniently connected with the rotating shaft 2, the integral structure of the magnetic liquid heat insulation sealing device 100 is facilitated to be simplified, and the magnetic liquid heat insulation sealing device 100 is convenient to assemble.
In some embodiments, the shaft 2 is provided with a shoulder 203, the second section 202 is located between the first section 201 and the shoulder 203 in the axial direction of the shaft 2, and an end of the fourth section 702, which is far from the third section 701 in the axial direction of the shaft 2, abuts against the shoulder 203.
Therefore, one end of the fourth segment 702 abuts against the shaft shoulder 203, so that the shaft sleeve 7 can be positioned in the axial direction of the rotating shaft 2, and the assembly of the magnetic liquid heat insulation sealing device 100 is further facilitated.
In some embodiments, an end of the fourth section 702, which is distant from the third section 701 in the axial direction of the rotation shaft 2, is connected to the shoulder 203. For example, an end of the fourth segment 702, which is away from the third segment 701 in the axial direction of the rotating shaft 2, is connected to the shoulder 203 by a fastener.
Of course, in other embodiments, the sleeve 7 and the shaft 2 may be connected by interference fit between the fourth section 702 of the sleeve 7 and the second section 202 of the shaft 2.
In some embodiments, the pole pieces include a first pole piece 3 and a second pole piece 4, and the first pole piece 3 and the second pole piece 4 are arranged at intervals along the axial direction of the rotating shaft 2.
The first pole piece 3 is provided with a first pole tooth 31, the second pole piece 4 is provided with a second pole tooth 41, the first pole tooth 31 is spaced from the shaft sleeve 7 in the radial direction of the rotating shaft 2 to form a sealing gap, and the second pole tooth 41 is spaced from the shaft sleeve 7 in the radial direction of the rotating shaft 2 to form a sealing gap. Preferably, the distance between the first tooth 31 and the sleeve 7 and between the second tooth 41 and the sleeve 7 in the axial direction of the rotating shaft 2 is 0.001 to 1 mm.
In some embodiments, the magnetic liquid heat-insulating sealing device 100 further comprises a first sealing ring 8 and a second sealing ring 9. The outer peripheral surface of the first pole shoe 3 is provided with a first annular groove, a first sealing ring 8 is fixedly arranged in the first annular groove, and the outer peripheral surface of the first sealing ring 8 is attached to the inner peripheral surface of the shell 1. A second annular groove is formed in the outer peripheral surface of the second pole shoe 4, a second sealing ring 9 is fixedly installed in the second annular groove, and the outer peripheral surface of the second sealing ring 9 is attached to the inner peripheral surface of the shell 1.
Accordingly, the first seal ring 8 improves the sealing performance between the first pole piece 3 and the inner circumferential surface of the housing 1, and the second seal ring 9 improves the sealing performance between the second pole piece 4 and the inner circumferential surface of the housing 1, thereby further improving the sealing pressure resistance performance of the magnetic liquid heat-insulating sealing device 100.
Preferably, the first pole piece 3 and the second pole piece 4 are symmetrically arranged. For example, as shown in fig. 1, the first pole piece 3 is disposed on the left side of the second pole piece 4, and the first pole piece 3 and the second pole piece 4 are disposed in left-right symmetry. Thus, design and installation of the magnetic liquid heat-insulating sealing device 100 are facilitated.
In some embodiments, as shown in fig. 3, the magnetic liquid heat insulation sealing device 100 further includes a partition plate 18, the partition plate 18 is sleeved outside the shaft sleeve 7, the partition plate 18 is connected to the rotating shaft 2, and the partition plate 18 is located between the first pole piece 3 and the second pole piece 4 in the axial direction of the rotating shaft 2.
The magnetic liquid sealing device in the related art is installed on equipment for use, and when the equipment is in a working state, if the pressure difference between two sides of the seal suddenly and rapidly rises, an O-shaped ring formed by the magnetic liquid can be broken under the action of the pressure difference. The magnetic liquid after the fracture can generate wall surface jet flow, namely, the magnetic liquid after the fracture develops and dissipates on the outer peripheral surface of the rotating shaft along the radial direction of the rotating shaft. After the equipment is stopped or pressure is transmitted to the next stage of multi-stage sealing, the pressure difference is reduced or even disappears, at the moment, one part of the flowed-out magnetic liquid returns to the pole teeth of the pole shoe under the action of the magnetic field force of the permanent magnet, and the other part of the flowed-out magnetic liquid cannot return to the pole teeth of the pole shoe due to the fact that the distance between the flowed-out magnetic liquid and the pole shoe is far and the magnetic field force of the permanent magnet is limited, so that the part of the magnetic liquid is lost from the pole teeth of the pole shoe, and the sealing performance of the self-repaired magnetic liquid sealing device is greatly reduced or even the sealing fails.
The magnetic liquid heat-insulation sealing device 100 according to the embodiment of the invention is installed on a device for use, the device is in a working state, and when the magnetic liquid 15 at the first pole piece 3 or the second pole piece 4 is broken under the action of pressure difference. For example, as shown in fig. 3, when the magnetic liquid 15 at the first pole piece 3 is broken under the action of the pressure difference, part of the magnetic liquid 15 flows out from the first pole piece 3, and due to the existence of the partition plate 18 between the first pole piece 3 and the second pole piece 4, the flowing-out magnetic liquid 15 generates impact jet, that is, the flowing-out magnetic liquid 15 collides with the partition plate 18 during the flowing process. On one hand, due to the existence of the partition plate 18 and the consumption of a part of kinetic energy of the flowing-out magnetic liquid 15 in the impact process, the flowing-out magnetic liquid 18 cannot be lost to a position far away from the first pole piece 3, on the other hand, the speed direction of the flowing-out magnetic liquid 15 can also be changed, and then after the equipment is stopped or pressure is transmitted to the next stage of sealing of the multi-stage sealing, the flowing-out magnetic liquid 15 can more easily return to the sealing gap formed between the first pole piece 3 and the shaft sleeve 7 under the action of the magnetic field force of the permanent magnet 5.
Therefore, the magnetic liquid heat insulation sealing device 100 according to the embodiment of the invention also has the advantages of good self-repairing force of the magnetic liquid and the like.
Preferably, the spacer 18 is made of a non-magnetic material. Therefore, the phenomenon that the flowing-out magnetic liquid 15 is adsorbed on the partition plate 18 under the action of the magnetic field force of the permanent magnet 5 can be reduced or even avoided, the flowing-out magnetic liquid 15 returns to the pole teeth of the corresponding pole shoe under the action of the magnetic field force of the permanent magnet 5, the magnetic liquid self-repairing force of the magnetic liquid heat-insulating sealing device 100 is further improved, and the sealing pressure resistance of the magnetic liquid heat-insulating sealing device 100 is improved.
In some embodiments, the partition 18 has a first portion 181 and a second portion 182, the first portion 181 is connected to the sleeve 7, the second portion 182 is connected to the first portion 181, the second portion 182 is spaced apart from the sleeve 7 in the radial direction of the rotating shaft 2, and the first portion 181, the second portion 182 and the sleeve 7 enclose a receiving chamber 183 which is open toward the first pole piece 3.
For example, the first portion 181 has a first stop surface, the second portion 182 has a second stop surface, and the first stop surface, the second stop surface and the outer peripheral surface of the sleeve 7 enclose a receiving cavity 183.
Therefore, the magnetic liquid 15 flowing out from the first pole piece 3 can only flow in the accommodating cavity 183, the flowing-out magnetic liquid 15 can be returned to the first pole tooth 31 of the first pole piece 3, the magnetic liquid self-repairing force of the magnetic liquid heat-insulation sealing device 100 can be further improved, and the sealing pressure resistance performance of the magnetic liquid heat-insulation sealing device 100 can be improved. In addition, the existence of the accommodating cavity 183 can also reduce or avoid the volatilization of the base carrier liquid of the magnetic liquid 15 to a certain extent, which is beneficial to further improving the sealing pressure-resistant performance of the magnetic liquid heat-insulating sealing device 100.
In some embodiments, the magnetic liquid heat-insulating sealing device 100 further comprises a first bearing 11, a second bearing 12, and a heat-insulating ring 13, each of the pole shoe and the permanent magnet 5 being located between the first bearing 11 and the second bearing 12 in the axial direction of the rotating shaft 2, the first bearing 11 being disposed adjacent to the first end 104 relative to the second bearing 12 in the axial direction of the rotating shaft 2. The heat insulation ring 13 is sleeved on the outer side of the rotating shaft 2, and the heat insulation ring 13 is located between the pole shoe and the first bearing 11 in the axial direction of the rotating shaft 2.
Thereby, on the one hand, the rotational mounting of the shaft 2 in the chamber 103 is facilitated by the first bearing 11 and the second bearing 12. On the other hand, the heat transferred to the pole shoe by the first bearing 11 can be reduced by the heat insulation ring 13, so that the heat transferred to the magnetic liquid 15 by the pole shoe is reduced, and the magnetic liquid 15 is prevented from being too high in temperature, so that the magnetic liquid 15 is in a proper temperature range.
It should be noted that, as described above, since the temperature of the rotating shaft 2 near the first end 104 is high, and the temperature of the rotating shaft 2 near the second end 105 is not too high, the magnetic liquid 15 can be prevented from being too high in temperature by only providing the heat insulating ring 13 between the first bearing 11 and the pole shoe, so that the magnetic liquid 15 is in a proper temperature range.
Of course, in other embodiments, an insulating ring may be provided between the pole shoe and the first bearing 11 and between the pole shoe and the second bearing 12.
In some embodiments, the heat shield ring 13 is a ceramic ring. Therefore, the heat insulation ring 13 has a good heat insulation effect, so that the temperature of the magnetic liquid 15 is effectively reduced, the sealing effect of the magnetic liquid heat insulation sealing device 100 is further improved, and the service life of the magnetic liquid heat insulation sealing device 100 is prolonged.
In some embodiments, the magnetic liquid heat insulation sealing device 100 further includes a magnetism isolating ring 14, the magnetism isolating ring 14 is sleeved outside the rotating shaft 2, the magnetism isolating ring 14 is located between the pole shoe and the second bearing 12 in the axial direction of the rotating shaft 2, and the magnetism isolating ring 14 is located between the permanent magnet 5 and the second bearing 12 in the axial direction of the rotating shaft 2.
Therefore, the magnetism isolating ring 14 prevents the magnetic loop from passing through the second bearing 12, magnetic leakage is formed, and the magnetism isolating ring 14 plays an axial positioning role for the second bearing 12.
In some embodiments, the magnetic liquid heat-insulating sealing device 100 further includes a first retainer ring 16 and a second retainer ring 17, each of the first retainer ring 16 and the second retainer ring 17 is mounted on the rotating shaft 2, and the first retainer ring 16 and the second retainer ring 17 are provided at intervals in the axial direction of the rotating shaft 2. The second end cap 102 is provided with a first stopping surface 1021, and the body 101 is provided with a second stopping surface 1011. Wherein the outer ring of the first bearing 11 is positioned between the first stop surface 1021 and the heat insulation ring 13 in the axial direction of the rotating shaft 2, and the left end of the inner ring of the first bearing 11 abuts against the first retaining ring 16. The outer ring of the second bearing 12 is positioned between the second stopper surface 1011 and the magnetism isolating ring 14 in the axial direction of the rotating shaft 2, and the right end of the inner ring of the second bearing 12 abuts against the second stopper ring 17.
Preferably, the material of the shell 1 is a non-magnetic material, the material of the shaft sleeve 7 is a magnetic material, the material of the permanent magnet 5 is a permanent magnet material, and the heat insulation ring 13 is a non-magnetic material with a low thermal conductivity coefficient.
The type of the magnetic liquid 15 can be selected according to the type of a sealing medium in an actual use environment and the environmental working condition, ester-based magnetic liquid can be selected when the vacuum degree requirement is high, and fluorocarbon-based magnetic liquid can be selected for high-temperature sealing.
In addition, the radial thickness of the shaft sleeve 7 can be increased or decreased according to the requirement of the magnetic field intensity in the sealing gap during specific use. The types of the first bearing 11 and the second bearing 12 can be selected according to the actual axial load and the working temperature range, for example, the first bearing 11 and the second bearing 12 are deep groove ball bearings or angular contact ball bearings.
The assembly process of the magnetic liquid heat-insulating sealing device 100 according to the embodiment of the present invention is described below with reference to fig. 1 and 2:
the second bearing 12 is sleeved on the outer side of the rotating shaft 2, the second retainer 17 is installed on the rotating shaft 2, the heat insulation sleeve 6 is sleeved on the outer side of the rotating shaft 2, the shaft sleeve 7 is sleeved on the outer side of the heat insulation sleeve 6, and the right end of the shaft sleeve 7 abuts against the shaft shoulder 203. The rotating shaft 2 with the second bearing 12, the second retainer 17, the heat insulating jacket 6 and the shaft sleeve 7 is mounted in the chamber 103 of the housing 1, and the outer ring of the second bearing 12 abuts against the second stop surface 1011. The magnetism isolating ring 14, the second pole shoe 4 provided with the second sealing ring 9, the permanent magnet 5, the first pole shoe 3 provided with the first sealing ring 8 and the heat isolating ring 13 are sequentially sleeved on the rotating shaft 2 and are arranged in the cavity 103 of the shell 1. The magnetic liquid 15 is injected into the sealing gap between the first pole piece 3 and the shaft sleeve 7 and the sealing gap between the second pole piece 4 and the shaft sleeve 7. The first bearing 11 is sleeved on the outer side of the rotating shaft 2, the first retainer ring 16 is installed on the rotating shaft 2, and the end cover 102 is installed at the left end of the main body 101 through a connecting piece, so that the installation of the magnetic liquid heat insulation sealing device 100 is completed.
In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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," "secured," and the like are to be construed broadly and can, 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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" and the like mean that a specific 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 above, 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 within the scope of the present invention.
Claims (10)
1. A magnetic liquid heat insulation sealing device is characterized by comprising:
a housing defining a chamber;
the rotating shaft is rotatably arranged in the cavity, and the shell is provided with a first end part and a second end part which are opposite in the axial direction of the rotating shaft;
the heat insulation sleeve is sleeved on the outer side of the rotating shaft and is connected with the rotating shaft;
the shaft sleeve is sleeved outside the heat insulation sleeve;
the permanent magnet is sleeved on the outer side of the rotating shaft; and
the pole shoe is sleeved on the outer side of the shaft sleeve, the inner circumferential surface of the pole shoe and the outer circumferential surface of the shaft sleeve are spaced in the radial direction of the rotating shaft to form a sealing gap, and magnetic liquid is filled in the sealing gap.
2. The magnetic liquid heat-insulating sealing device according to claim 1, wherein the heat-insulating sleeve is made of a flexible material.
3. The magnetic liquid heat-insulating sealing device according to claim 2, wherein the rotating shaft is a stepped shaft including a first section and a second section, the first section is disposed adjacent to the first end portion relative to the second section in an axial direction of the rotating shaft, a diameter of the first section is smaller than a diameter of the second section, and the heat-insulating sleeve is opposite to the first section in a radial direction of the rotating shaft;
the shaft sleeve comprises a third section and a fourth section, the third section is arranged close to the first end relative to the fourth section in the axial direction of the rotating shaft, the third section is opposite to the heat insulation sleeve in the radial direction of the rotating shaft, the fourth section is opposite to the second section in the radial direction of the rotating shaft, and the inner circumferential surface of the fourth section is attached to the outer circumferential surface of the second section.
4. The magnetic liquid heat-insulating sealing device according to claim 3, wherein the inner peripheral surface of the third section is attached to the outer peripheral surface of the heat-insulating sleeve so as to clamp the heat-insulating sleeve through the shaft and the sleeve in the radial direction of the shaft.
5. The magnetic liquid heat-insulating sealing device according to claim 3, wherein a shaft shoulder is arranged on the rotating shaft, the second section is located between the first section and the shaft shoulder in the axial direction of the rotating shaft, and one end, far away from the third section in the axial direction of the rotating shaft, of the fourth section abuts against the shaft shoulder.
6. The magnetic liquid heat seal apparatus of claim 1, further comprising:
a first bearing and a second bearing, each of the pole piece and the permanent magnet being located between the first bearing and the second bearing in an axial direction of the rotating shaft, the first bearing being disposed adjacent the first end relative to the second bearing in the axial direction of the rotating shaft; and
the heat insulation ring is sleeved on the outer side of the rotating shaft and is located between the pole shoe and the first bearing in the axial direction of the rotating shaft.
7. The magnetic liquid heat shield seal of claim 6 wherein said heat shield ring is a ceramic ring.
8. The magnetic liquid heat seal apparatus of claim 6, further comprising:
the magnetism isolating ring is sleeved on the outer side of the rotating shaft, is positioned between the pole shoe and the second bearing in the axial direction of the rotating shaft, and is positioned between the permanent magnet and the second bearing in the axial direction of the rotating shaft.
9. The magnetic liquid heat insulation sealing device according to any one of claims 1 to 8, wherein the pole pieces include a first pole piece and a second pole piece, the first pole piece and the second pole piece being disposed at a spacing in an axial direction of the rotating shaft;
the shaft sleeve is sleeved with the baffle plate, the baffle plate is connected with the shaft sleeve, and the baffle plate is located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft.
10. The magnetic liquid heat-insulating sealing device according to claim 9, wherein the partition plate has a first portion and a second portion, the first portion is connected with the shaft sleeve, the second portion is connected with the first portion, the second portion is arranged at a distance from the shaft sleeve in a radial direction of the rotating shaft, and the first portion, the second portion and the shaft sleeve enclose a containing cavity which is opened towards the first pole piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110309294.6A CN112963547B (en) | 2021-03-23 | 2021-03-23 | Magnetic liquid heat insulation sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110309294.6A CN112963547B (en) | 2021-03-23 | 2021-03-23 | Magnetic liquid heat insulation sealing device |
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| CN112963547B (en) | 2022-06-03 |
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