Magnetic liquid seal with compressor

Abstract

The application discloses a magnetic liquid sealing device with a compressor, which comprises a shaft shell, a rotating shaft, at least one pole shoe and a compressor. The rotating shaft is internally provided with a mounting cavity which is communicated with the outside. The side of the pole shoe which is adjacent to a sealed container is provided with a first gas flow cavity. The shaft shell is provided with a first exhaust hole which is communicated with the first gas flow cavity. The rotating shaft is provided with a first gas outlet hole which is communicated with the mounting cavity and the first gas flow cavity. The compressor shaft is connected with the shaft shell and is relatively static. The static blade is connected with the compressor shaft. The rotor blade is connected with the wall surface of the mounting cavity and rotates with the rotating shaft. The compressor blows gas to the first gas flow cavity through the first gas outlet hole, so that the sealed medium and the magnetic liquid are separated. The unstable problem of the two liquid contact interfaces when the liquid medium is sealed can be effectively solved, the sealing reliability is improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] This invention relates to the field of magnetic liquid sealing technology, and in particular to a magnetic liquid sealing device with a compressor. Background Technology

[0002] Magnetic fluid sealing technology boasts advantages such as zero leakage, no wear, long lifespan, and simple structure, leading to its increasing adoption across various industries. However, in these technologies, when magnetic fluids seal liquid media, the instability at the interface between the two liquids makes the magnetic fluid highly susceptible to miscibility with the sealed liquid medium, resulting in seal failure. High-pressure, high-velocity environments not only exacerbate the instability at the liquid-liquid interface between the magnetic fluid and the sealed liquid medium, but also facilitate emulsification between the sealing and sealed liquids, leading to a decline in the magnetic fluid's performance and ultimately, seal failure. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a magnetic liquid sealing device with a compressor, exhibiting good sealing reliability.

[0004] The magnetic liquid sealing device of this invention includes: a shaft housing having a cavity; a rotating shaft passing through the cavity, the rotating shaft having an installation cavity communicating with the outside; at least one pole shoe located in the cavity and fitted onto the rotating shaft, the pole shoe being connected to the shaft housing, the inner side of the pole shoe having a plurality of pole teeth spaced apart axially along the rotating shaft, the pole teeth forming a sealing gap with the outer peripheral surface of the rotating shaft, the pole teeth being magnetic and magnetic liquid being adsorbed within the sealing gap, the side of the pole shoe adjacent to the sealed container having a first gas flow cavity, and the shaft housing having a mounting cavity corresponding to the outer peripheral surface of the rotating shaft. A first exhaust port is connected to a first gas flow chamber, and a first exhaust port is provided on the rotating shaft to connect the mounting cavity and the first gas flow chamber; a compressor is installed in the mounting cavity, the compressor includes a compressor shaft, rotor blades and stationary blades, the compressor shaft is connected to the shaft housing and is stationary relative to it, the stationary blades are connected to the compressor shaft, the rotor blades are connected to the wall of the mounting cavity and rotate with the rotating shaft, at least a portion of the rotor blades and the stationary blades are axially opposite each other on the compressor shaft, and the compressor blows air into the first gas flow chamber through the first exhaust port.

[0005] The magnetic liquid sealing device provided in this invention uses a compressor installed in the mounting cavity inside the rotating shaft. The rotation of the shaft generates gas at a certain pressure, which separates the medium to be sealed from the magnetic liquid. This effectively solves the problem of instability at the interface between the two liquids when sealing the liquid medium, improves sealing reliability, increases the service life of the device, eliminates the need for an external gas tank, saves energy, and the compressor does not occupy the axial installation space inside the housing, making it suitable for sealing devices with high requirements for axial space.

[0006] In some embodiments, there are multiple rotor blades and multiple stationary blades, and the multiple rotor blades and multiple stationary blades are alternately arranged in the axial direction of the compressor shaft.

[0007] In some embodiments, at least a portion of the mounting cavity has an inner radial direction that gradually decreases toward the sealed container, and the first vent hole communicates with the small-diameter end of the mounting cavity.

[0008] In some embodiments, there are multiple first vent holes, which are spaced apart in the circumferential direction of the rotating shaft; and / or, there are multiple first exhaust holes, which are spaced apart in the circumferential direction of the rotating shaft on the peripheral wall of the shaft housing.

[0009] In some embodiments, the side of the pole shoe away from the sealed container has a second gas flow chamber, the shaft housing is provided with a second exhaust port communicating with the second gas flow chamber, the rotating shaft is provided with a second vent port communicating with the mounting cavity and the second gas flow chamber, the second vent port is located upstream of the first vent port, the compressor also blows air into the second gas flow chamber through the second vent port, and the magnetic liquid sealing device includes a first filter element, which is disposed at the air inlet of the mounting cavity.

[0010] In some embodiments, the magnetic liquid sealing device includes a second filter element disposed at the first vent and / or the second vent.

[0011] In some embodiments, the pole shoe includes a first pole shoe and a second pole shoe, and the dustproof magnetic liquid sealing device includes a permanent magnet located axially between the first pole shoe and the second pole shoe and abutting against each of the first pole shoe and the second pole shoe, the first pole shoe being adjacent to the sealed container relative to the second pole shoe, and the first gas flow chamber being located on the side of the first pole shoe adjacent to the sealed container.

[0012] In some embodiments, the magnetic liquid sealing device further includes: a first bearing located in the chamber and supported between the shaft housing and the rotating shaft; a second bearing located in the chamber and supported between the shaft housing and the rotating shaft, wherein the first pole shoe, the second pole shoe and the permanent magnet are located axially on the rotating shaft between the first bearing and the second bearing, and the first bearing is adjacent to the sealed container relative to the second bearing.

[0013] In some embodiments, the first gas flow cavity is formed between the first pole shoe and the first bearing; or, the first gas flow cavity is located on the side of the first bearing adjacent to the sealed container.

[0014] In some embodiments, the magnetic liquid sealing device includes a fixing member, one end of which extends into the mounting cavity and is connected to the compressor shaft, and the other end of which extends out of the rotating shaft and is connected to the shaft housing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the magnetic liquid sealing device according to an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the intermediate-pressure turbine.

[0017] Figure 3 This is a schematic diagram of the internal structure of a magnetic liquid sealing device according to another embodiment of the present invention.

[0018] Figure label:

[0019] Magnetic liquid sealing device 100

[0020] Shaft housing 1, chamber 11, first exhaust port 12, outer shell 13, end cap 14, second connecting hole 141, second exhaust port 15, rotating shaft 2, mounting cavity 21, vent 22, first air outlet 23, second air outlet 24.

[0021] 3. Pole shoe; 31. First pole shoe; 32. Second pole shoe; 33. Pole tooth; 34. Magnetic fluid; 35. First gas flow chamber; 36. Second gas flow chamber.

[0022] Compressor 4, compressor shaft 41, rotor blades 42, stationary blades 43

[0023] First filter element 51, second filter element 52

[0024] Permanent magnet 6.

[0025] First bearing 71, second bearing 72, first sleeve 81, first connecting hole 811, second sleeve 82, elastic retaining ring 9, and fastener 10. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is based on Figures 1-3 The magnetic liquid sealing device 100 of the present invention is described in an embodiment of the present invention. The magnetic liquid sealing device 100 includes: a shaft housing 1, a rotating shaft 2, at least one pole shoe 3, and a compressor 4.

[0028] The housing 1 has a chamber 11, through which the rotating shaft 2 passes and is rotatable relative to the housing 1. Both ends of the rotating shaft 2 extend from both sides of the chamber 11. The rotating shaft 2 has a mounting cavity 21 that communicates with the outside. For example, the rotating shaft 2 has a vent 22 for communicating with the mounting cavity 21 and the outside.

[0029] The pole shoe 3 is fitted onto the rotating shaft 2 and located within the chamber 11. The pole shoe 3 is connected to the shaft housing 1. The inner circumferential surface of the pole shoe 3 is provided with multiple pole teeth 33 spaced apart along the axial direction of the rotating shaft 2. A tooth groove is formed between adjacent pole teeth 33, and a sealing gap is formed between the pole teeth 33 and the outer circumferential surface of the rotating shaft 2. The pole teeth 33 are magnetic, and a magnetic liquid 34 is adsorbed within the sealing gap. The magnetic liquid 34 is adsorbed onto the tooth tip surface of the pole teeth 33 and comes into contact with the outer circumferential surface of the rotating shaft 2, thereby achieving a sealing function.

[0030] The side of the pole shoe 3 adjacent to the sealed container has a first gas flow chamber 35, the sealed container being used to contain the sealed substance, for example, Figure 1 The sealed container is connected to the left side of the shaft housing 1. The shaft housing 1 is provided with a first exhaust port 12 that communicates with the first gas flow chamber 35, and the rotating shaft 2 is provided with a first vent port 23 that communicates with the mounting cavity 21 and the first gas flow chamber 35.

[0031] The compressor 4 is installed in the mounting cavity 21. The compressor 4 includes a compressor shaft 41, rotor blades 42 and stationary blades 43. The compressor shaft 41 is connected to the shaft housing 1 and is stationary relative to it. The stationary blades 43 are connected to the compressor shaft 41. The rotor blades 42 are connected to the inner wall of the mounting cavity 21 and rotate with the rotating shaft 2. At least a portion of the rotor blades 42 and the stationary blades 43 are axially opposite each other on the compressor shaft 41. The compressor 4 blows air into the first gas flow cavity 35 through the first air outlet 23.

[0032] The rotation of shaft 2 drives rotor blades 42 to rotate. Gas enters the mounting cavity 21 from the vent 22 of shaft 2. The airflow is pushed by rotor blades 42, increasing the velocity and total pressure. Stationary blades 43 are relatively stationary with respect to the shaft housing 1. The airflow then experiences resistance from stationary blades 43, further increasing the static pressure. Ultimately, compressor 3 generates an airflow with a certain pressure and velocity. The airflow exits from the exhaust end of compressor 4 and is forced into the first gas flow cavity 35 through the first outlet 23. A gas isolation layer with a certain pressure is formed in the first gas flow cavity 35. The gas in the gas isolation layer can be discharged from the first exhaust port 12. The gas flowing in the first gas flow cavity 35 isolates the sealed material in the sealed container from the magnetic liquid.

[0033] The magnetic liquid sealing device provided in this invention uses a compressor installed in the mounting cavity inside the rotating shaft. The rotation of the shaft generates gas at a certain pressure, which separates the medium to be sealed from the magnetic liquid. This effectively solves the problem of instability at the interface between the two liquids when sealing the liquid medium, improves sealing reliability, increases the service life of the device, eliminates the need for an external gas tank, saves energy, and the compressor does not occupy the axial installation space inside the housing, making it suitable for sealing devices with high requirements for axial space.

[0034] For ease of description, the following will use... Figure 1 and Figure 3 Taking the rotating shaft 2, which extends axially in the left-right direction in the magnetic liquid sealing device 100 shown, as an example, the magnetic liquid sealing device 100 of this embodiment is described. The air inlet end of the compressor 4 is its right end, and the air outlet end of the compressor 4 is its left end. The first air outlet 23 of the rotating shaft 2 is connected to the air outlet end of the compressor 4. Figure 1 and Figure 3 As shown, the compressor shaft 41 is coaxial with the rotating shaft 2, that is, the central axis of the compressor shaft 41 extends in the left and right direction and coincides with the central axis of the rotating shaft 2.

[0035] In some embodiments, such as Figure 2 As shown, there are multiple rotor blades 42, which are spaced apart in the axial direction of the compressor shaft 41. The rotor blades 42 are connected to the peripheral wall of the mounting cavity 21 and extend radially toward the compressor shaft 41. The inner end face of the rotor blades 42 is spaced apart from the compressor shaft 41 to prevent the compressor shaft 41 from affecting the rotation of the rotor blades 42.

[0036] There are multiple stationary blades 43, which are spaced apart axially on the compressor shaft 41. The stationary blades 43 are connected to the compressor shaft 41 and extend radially toward the peripheral wall of the mounting cavity 21. There is a gap between the outer end face of the stationary blade 43 and the peripheral wall of the mounting cavity 21 to prevent the rotation of the shaft 2 from affecting the stationary blades 43.

[0037] like Figure 2 As shown, multiple rotor blades 42 and multiple stationary blades 43 are alternately arranged in the axial direction of the compressor shaft 41. The arrangement of multiple rotor blades 42 and multiple stationary blades 43 can increase the speed and pressure of the airflow. After the airflow is pressurized multiple times by multiple stages of blades, it enters the first gas flow chamber 35, which increases the pressure of the gas isolation layer in the first gas flow chamber 35 and improves the isolation effect.

[0038] In some embodiments, at least a portion of the inner radial direction of the mounting cavity 21 gradually decreases towards the sealed container, that is, the inner diameter of the air outlet end of the mounting cavity 21 is smaller than the inner diameter of the air inlet end of the mounting cavity 21, and the first air outlet 23 communicates with the small-diameter end of the mounting cavity 21. Figure 1 and Figure 2 In the example shown, the inner diameter of the mounting cavity 21 gradually decreases to the left, and the small diameter end of the mounting cavity 21 is the left end of the mounting cavity 21. The dimensions of the rotor blade 42 and the stationary blade 43 are adapted to the inner diameter of the mounting cavity 21. As the airflow flows from right to left, it is affected by the contraction of the inner diameter of the mounting cavity 21, which further increases the pressure of the airflow, thereby further increasing the pressure of the gas isolation layer in the first gas flow cavity 35, making the isolation effect of the gas isolation layer better.

[0039] Optionally, the ratio of the inner diameter of the small-diameter end of the mounting cavity 21 to the inner diameter of the large-diameter end of the mounting cavity 21 is 0.1-0.9. If the ratio of the inner diameter of the small-diameter end of the mounting cavity 21 to the inner diameter of the large-diameter end of the mounting cavity 21 is too large, for example, greater than 0.9, the pressurization effect on the airflow will not be obvious. If the ratio of the inner diameter of the small-diameter end of the mounting cavity 21 to the inner diameter of the large-diameter end of the mounting cavity 21 is too small, for example, less than 0.1, it may affect the discharge of the airflow.

[0040] The following is based on Figures 1-2 A magnetic liquid sealing device 100 is described in a specific embodiment of the present invention.

[0041] exist Figure 1 and Figure 2In the illustrated embodiment, the magnetic liquid sealing device 100 has two pole shoes 3, including a first pole shoe 31 and a second pole shoe 32. The first pole shoe 31 and the second pole shoe 32 are spaced apart axially on the rotating shaft 2. The first pole shoe 31 is located to the left of the second pole shoe 32 and is relatively close to the sealed container. The first gas flow chamber 35 is located on the side of the first pole shoe 31 that is close to the sealed container, that is, to the left of the first pole shoe 31. Furthermore, both the first pole shoe 31 and the second pole shoe 32 are annular, with their outer circumferences connected to the shaft housing 1 and relatively stationary with respect to the shaft housing 1. When the rotating shaft 2 rotates, relative movement occurs between the rotating shaft 2 and the first pole shoe 31 and the second pole shoe 32. The magnetic liquid is maintained in the sealing gap between the first pole shoe 31 and the rotating shaft 2, and in the sealing gap between the second pole shoe 32 and the rotating shaft 2.

[0042] The magnetic liquid sealing device 100 includes a permanent magnet 6, which is located axially between the first pole piece 31 and the second pole piece 32 of the rotating shaft 2. The first pole piece 31 and the second pole piece 32 are made of magnetically conductive material. The magnetic field lines of the permanent magnet 6 pass through the first pole piece 31 and the second pole piece 32, so that both the first pole piece 31 and the second pole piece 32 are magnetic. As a result, the magnetic liquid 34 used for sealing can be adsorbed at the pole teeth 33 of the first pole piece 31 and the second pole piece 32.

[0043] Specifically, the permanent magnet 6 has a first end (left end) and a second end (right end) opposite each other along the axial direction of the rotating shaft 2. The first end of the permanent magnet 6 abuts against the first pole piece 31, making the first pole piece 31 magnetic. The second end of the permanent magnet 6 abuts against the second pole piece 32, making the second pole piece 32 magnetic. In other words, a magnetic circuit is formed between the permanent magnet 6, the first pole piece 31, the second pole piece 32, and the rotating shaft 2. Under the action of the magnetic field, the magnetic fluid is adsorbed into the sealed gap.

[0044] Optionally, the permanent magnet 6 is ring-shaped, or the permanent magnet 6 is a plurality of permanent magnet blocks arranged sequentially around the circumference of the rotating shaft 2, and each permanent magnet block abuts against each of the first pole piece 31 and the second pole piece 32 to provide magnetism to the pole piece 3.

[0045] In other alternative embodiments, the number of pole shoes 3 and their arrangement with the permanent magnets 6 can be different, and the present invention does not limit this.

[0046] Furthermore, such as Figure 1As shown, the magnetic liquid sealing device 100 further includes a first bearing 71, a second bearing 72, a first sleeve 81, a second sleeve 82, and an elastic retaining ring 9. The first bearing 71, the second bearing 72, the first sleeve 81, the second sleeve 82, and the elastic retaining ring 9 are all located within the chamber 11 of the shaft housing 1. The first bearing 71 and the second bearing 72 are both supported between the shaft housing 1 and the rotating shaft 2, supporting the rotation of the rotating shaft 2 relative to the shaft housing 1. Each of the first pole shoe 31, the permanent magnet 6, and the second pole shoe 32 is located axially between the first bearing 71 and the second bearing 72 on the rotating shaft 2.

[0047] exist Figure 1 In the example shown, the second bearing 72 is located to the right of the first bearing 71, and the first bearing 71 is adjacent to the sealed container relative to the second bearing 72. The first gas flow chamber 35 is located between the first bearing 71 and the first pole shoe 31. The first gas flow chamber 35 is annular, and the gas isolation layer with a certain pressure in the first gas flow chamber 35 effectively isolates the sealed medium and the magnetic liquid, protects the magnetic liquid from the influence of the sealed liquid medium, and extends its service life.

[0048] In other alternative embodiments, the first gas flow chamber 35 may be located on the side of the first bearing 71 adjacent to the sealed container.

[0049] exist Figure 1 In the example shown, there are multiple first vent holes 23, which are spaced apart circumferentially on the rotating shaft 2. The first vent holes 23 extend radially along the rotating shaft 2, with their inner ends communicating with the outlet end of the compressor 4 and their outer ends communicating with the first gas flow chamber 35. The arrangement of multiple first vent holes 23 allows the airflow discharged from the outlet end of the compressor 4 to be evenly introduced into the annular first gas flow chamber 35, forming a more uniform gas isolation layer within the first gas flow chamber 35, effectively isolating the sealed liquid medium from the magnetic liquid.

[0050] exist Figure 1 In the example shown, there are multiple first exhaust holes 12, which are spaced apart on the peripheral wall of the housing 2 in the circumferential direction of the rotating shaft 2. The arrangement of multiple first exhaust holes 12 helps to smoothly discharge the airflow in the first gas flow chamber 35 and maintain unobstructed airflow.

[0051] like Figure 1As shown, the first sleeve 81 is axially supported between the first pole shoe 31 and the first bearing 71 on the rotating shaft 2, and the first sleeve 81 is made of a non-magnetic material. The second sleeve 82 is axially supported between the second pole shoe 32 and the second bearing 72 on the rotating shaft 2, and the second sleeve 82 is also made of a non-magnetic material. The arrangement of the first sleeve 81 and the second sleeve 82 prevents the first bearing 71 and the second bearing 72 from affecting the magnetic field and causing magnetic field leakage. The first sleeve 81 is provided with a first connecting hole 811 that is opposite to and communicates with the first exhaust hole 12.

[0052] The elastic retaining ring 9 is sleeved on the rotating shaft 2 and abuts against the left end face of the first bearing 71 to limit the axial position of the first bearing 71 on the rotating shaft 2.

[0053] Furthermore, to facilitate the installation of the aforementioned components into the cavity 11 of the shaft housing 1, such as... Figure 1 As shown, the shaft housing 1 of the magnetic liquid sealing device 100 includes a housing 13 and an end cap 14, the housing 13 having a first end opposite to the shaft 2 in the axial direction (e.g., Figure 1 (left end) and second end (e.g.) Figure 1 The right end of the outer casing 13 is connected to the sealed container (e.g., the first end of the outer casing 13). Figure 1 The sealed container is connected to the left end of the outer casing 13, and the second end of the outer casing 13 is sealed by the end cap 14.

[0054] The compressor shaft 41 of the compressor 4 is connected to the shaft housing 1 via a fixing member 10. Figure 1 In the example shown, one end of the fastener 10 extends into the mounting cavity 21 and is connected to the compressor shaft 41, while the other end of the fastener 10 extends out of the rotating shaft 2 and is connected to the end cover 14.

[0055] Optionally, the compressor shaft 41 can be fixed to any absolutely stationary part by means of the fastener 10, and the present invention does not limit this.

[0056] In related technologies, when magnetic fluid seals are used in dusty environments, dust can easily enter the gap between the magnetic fluid and the magnetic field, affecting the stability and sealing performance of the magnetic fluid.

[0057] The following is based on Figure 3 A magnetic liquid sealing device 100 is described in another specific embodiment of the present invention.

[0058] exist Figure 3 In the illustrated embodiment, the arrangement of the internal components of the magnetic liquid sealing device 100 can be referred to Figure 1 The embodiments shown are not described in detail here.

[0059] like Figure 3As shown, the side of the pole shoe 3 furthest from the sealed container has a second gas flow chamber 36, i.e., the second gas flow chamber 36 is located to the right of the second pole shoe 32. The shaft housing 1 has a second exhaust port 15 communicating with the second gas flow chamber 36, and the rotating shaft 2 has a second vent port 24 communicating with the mounting cavity 21 and the second gas flow chamber 36. The second vent port 24 is located upstream of the first vent port 23, and the compressor 4 also blows air into the second gas flow chamber 36 through the second vent port 24. A gas isolation layer with a certain pressure is formed in the second gas flow chamber 36, separating dust from the magnetic liquid in the environment. Furthermore, the gas in the second gas flow chamber 36 is in a circulating state, which can promptly discharge any dust that may enter, achieving zero dust pollution.

[0060] Furthermore, the magnetic liquid sealing device 100 also includes a first filter element 51, which is disposed at the air inlet of the mounting cavity 21, i.e., at the air vent 22. The first filter element 51 is used to filter the gas entering the first gas flow cavity 35 and the second gas flow cavity 36, preventing external dust from entering the first gas flow cavity 35 and the second gas flow cavity 36.

[0061] The magnetic liquid sealing device of this embodiment can effectively solve the problem that dust can easily contaminate the magnetic liquid when the magnetic liquid seal is used in a dusty environment, thereby improving the sealing reliability and increasing the service life of the device.

[0062] exist Figure 3 In the example shown, the first filter 51 is located at the vent 22 to preliminarily filter dust from the external environment, preventing a large amount of dust from entering the mounting cavity 21. The magnetic liquid sealing device also includes a second filter 51, which is located at the first vent 23 and the second vent 24. The second filter 52 is used to further filter dust in the airflow, preventing dust from entering the first gas flow cavity 35 and the second gas flow cavity 36.

[0063] Optionally, the first filter element 51 and the second filter element 52 are filter cotton or other breathable materials that can perform filtering functions.

[0064] Optionally, the second filter element 51 is disposed at the first air outlet 23, or the second filter element 51 is disposed at the second air outlet 24.

[0065] like Figure 3 As shown, the second gas flow chamber 36 is located on the right side of the second bearing 72. The second gas flow chamber 36 is annular and has a gas isolation layer with a certain pressure to effectively isolate external dust, protect the bearing and magnetic fluid from dust, and extend service life.

[0066] like Figure 3As shown, a portion of the end cap 14 extends from the second end of the housing 13 and abuts against the second bearing 72 to limit the axial position of the second bearing 72 on the rotating shaft 2. The portion of the end cap 14 is provided with a second connecting hole 141 that is opposite to and communicates with the second vent hole 15.

[0067] Multiple second air outlets 24 are arranged at intervals around the circumference of the rotating shaft 2. This arrangement allows the airflow discharged from the compressor 4 to be evenly introduced into the annular second gas flow chamber 36, forming a more uniform gas isolation layer within the chamber and effectively isolating external dust. Multiple second exhaust ports 15 are also arranged at intervals around the circumference of the rotating shaft 2 on the peripheral wall of the housing 2. This arrangement facilitates the smooth discharge of airflow from the second gas flow chamber 36, maintaining unobstructed airflow.

[0068] exist Figure 3 In the example shown, the second air outlet 24 is located upstream of the first air outlet 23. The first air outlet 23 is connected to the air outlet end of the compressor 4, and the second air outlet 24 is connected to the middle part of the compressor 4.

[0069] In other alternative embodiments, the second air outlet 24 is located upstream of the first air outlet 23, and both the first air outlet 23 and the second air outlet 24 are located downstream of the air outlet end of the compressor 4. Part of the gas discharged from the air outlet end of the compressor 4 enters the second gas flow chamber 36 through the second air outlet 24, and the other part of the gas enters the first gas flow chamber 35 through the first air outlet 23.

[0070] In other alternative embodiments, there can be two compressors 4, which are spaced apart axially on the rotating shaft 2. The second air outlet 24 is located between the two compressors 4, and the first air outlet 23 is located downstream of the two compressors 4. A portion of the airflow discharged from the outlet end of the upstream compressor 4 enters the second gas flow chamber 36 through the second air outlet 24, and the other portion of the airflow is transported downstream and further compressed by the downstream compressor 4 before entering the first gas flow chamber 34 through the first air outlet 23.

[0071] In the description of this invention, it should 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetic liquid sealing device with a compressor, characterized in that, include: Shaft housing, the shaft housing having a cavity; A rotating shaft that passes through the cavity, and an installation cavity communicating with the outside is provided inside the rotating shaft; At least one pole shoe is provided, which is located in the cavity and fitted with the rotating shaft. The pole shoe is connected to the shaft housing. The inner side of the pole shoe is provided with a plurality of pole teeth spaced apart along the axial direction of the rotating shaft. A sealing gap is formed between the pole teeth and the outer peripheral surface of the rotating shaft. The pole teeth are magnetic and magnetic liquid is adsorbed in the sealing gap. The side of the pole shoe adjacent to the sealed container has a first gas flow chamber. The shaft housing is provided with a first exhaust hole communicating with the first gas flow chamber. The rotating shaft is provided with a first vent hole communicating with the mounting cavity and the first gas flow chamber. A compressor is installed in the mounting cavity. The compressor includes a compressor shaft, rotor blades, and stationary blades. The compressor shaft is connected to the shaft housing and is stationary relative to it. The stationary blades are connected to the compressor shaft. The rotor blades are connected to the wall of the mounting cavity and rotate with the rotor shaft. At least a portion of the rotor blades and the stationary blades are axially opposite each other on the compressor shaft. The compressor blows air into the first gas flow cavity through the first air outlet. The pole shoe includes a first pole shoe and a second pole shoe, and the magnetic liquid sealing device includes a permanent magnet located axially between the first pole shoe and the second pole shoe and abutting against each of the first pole shoe and the second pole shoe. The first pole shoe is adjacent to the sealed container relative to the second pole shoe, and the first gas flow chamber is located on the side of the first pole shoe adjacent to the sealed container.

2. The magnetic liquid sealing device with a compressor according to claim 1, characterized in that, The rotor blades are multiple, and the stationary blades are multiple, with the multiple rotor blades and the multiple stationary blades alternately arranged along the axial direction of the compressor shaft.

3. The magnetic liquid sealing device with a compressor according to claim 1, characterized in that, At least a portion of the mounting cavity has an inner radial diameter that gradually decreases toward the sealed container, and the first vent hole communicates with the small-diameter end of the mounting cavity.

4. The magnetic liquid sealing device with a compressor according to claim 1, characterized in that, There are multiple first air outlets, which are spaced apart circumferentially on the rotating shaft; and / or, There are multiple first exhaust holes, which are spaced apart on the circumferential wall of the shaft housing.

5. The magnetic liquid sealing device with a compressor according to claim 1, characterized in that, The side of the pole shoe away from the sealed container has a second gas flow chamber. The shaft housing is provided with a second exhaust port communicating with the second gas flow chamber. The rotating shaft is provided with a second vent port communicating with the mounting cavity and the second gas flow chamber. The second vent port is located upstream of the first vent port. The compressor also blows air into the second gas flow chamber through the second vent port. The magnetic liquid sealing device includes a first filter element, which is disposed at the air inlet of the mounting cavity.

6. The magnetic liquid sealing device with a compressor according to claim 5, characterized in that, It includes a second filter element, which is disposed at the first air outlet and / or the second air outlet.

7. The magnetic liquid sealing device with a compressor according to claim 6, characterized in that, The magnetic liquid sealing device further includes: A first bearing is located in the cavity and supported between the shaft housing and the rotating shaft; The second bearing is located in the cavity and supported between the shaft housing and the rotating shaft. The first pole shoe, the second pole shoe, and the permanent magnet are located axially between the first bearing and the second bearing on the rotating shaft, with the first bearing being adjacent to the sealed container relative to the second bearing.

8. The magnetic liquid sealing device with a compressor according to claim 7, characterized in that, The first gas flow cavity is formed between the first pole shoe and the first bearing; or, The first gas flow chamber is located on the side of the first bearing adjacent to the sealed container.

9. The magnetic liquid sealing device with a compressor according to any one of claims 1-6, characterized in that, It includes a fixing member, one end of which extends into the mounting cavity and is connected to the compressor shaft, and the other end of which extends out of the rotating shaft and is connected to the shaft housing.

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