CN214404696U

CN214404696U - High-speed magnetic liquid sealing device

Info

Publication number: CN214404696U
Application number: CN202120355366.6U
Authority: CN
Inventors: 李德才; 李倩; 孙睿
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-10-15
Anticipated expiration: 2031-02-08

Abstract

The utility model discloses a high-speed magnetic liquid sealing device, high-speed magnetic liquid sealing device includes the casing, the axle, a plurality of pole shoes, the permanent magnet, the casing includes shell body and interior casing, interior casing has the cavity, inject the cooling chamber between interior casing and the shell body, be equipped with inlet and liquid outlet on the outer peripheral face of shell body, inlet and liquid outlet all communicate with the cooling chamber, the axle is rotationally established in the cavity, at least one end of axle stretches out from the cavity, a plurality of pole shoes are established in the cavity and the cover is established epaxially, a plurality of pole shoes set up along the axial direction interval of axle, set up along the radial interval of axle between the inner peripheral surface of pole shoe and the outer peripheral face of axle, the inner peripheral surface of pole shoe and the outer peripheral face of axle fill have magnetic liquid, the permanent magnet is established in the cavity and the cover is established epaxially, the permanent magnet is established between adjacent pole shoe. The utility model has the advantages of high cooling efficiency, strong sealing performance, long service life and the like.

Description

High-speed magnetic liquid sealing device

Technical Field

The utility model belongs to the sealed field of mechanical engineering, specifically, relate to a high-speed magnetic liquid sealing device.

Background

The magnetic liquid seal is a non-contact seal which can realize zero leakage and has irreplaceable effect in some high-end industrial occasions.

In the related art, when the magnetic liquid sealing device works and the shaft runs at a high speed, a large amount of heat is generated between the shaft and the pole shoe, the temperature of the magnetic liquid sealing device is increased, the magnetic liquid fails or the magnetism of the permanent magnet is weakened, and therefore the sealing performance and the reliability of the magnetic liquid sealing are affected.

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 utility model provides a high-speed magnetic liquid sealing device that cooling effect is good, sealing performance is strong, long service life.

According to the utility model discloses high-speed magnetic liquid sealing device, include: the cooling device comprises a shell, wherein the shell comprises an outer shell and an inner shell, the inner shell is provided with a cavity, a cooling cavity is defined between the inner shell and the outer shell, an extending part extending along the radial direction of the inner shell is arranged on the outer peripheral surface of the inner shell, the outer peripheral surface of the extending part and the inner peripheral surface of the outer shell are arranged at intervals, a liquid inlet and a liquid outlet are arranged on the outer peripheral surface of the outer shell, and the liquid inlet and the liquid outlet are both communicated with the cooling cavity; a shaft rotatably disposed within the chamber, at least one end of the shaft extending from the chamber; the pole shoes are arranged in the cavities and sleeved on the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft, and the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are filled with magnetic liquid; the permanent magnet is arranged in the cavity and sleeved on the shaft, and the permanent magnet is arranged between the adjacent pole shoes.

According to the utility model discloses high-speed magnetic liquid sealing device through the cooling chamber between interior casing and the shell body, cools down magnetic liquid sealing device effectively, has guaranteed magnetic liquid sealing device's sealing performance, has prolonged magnetic liquid sealing device's life.

In some embodiments, the extension portion is a plurality of extension portions, the extension portions are spaced apart in an axial direction of the inner housing, and a cooling groove is defined between adjacent extension portions and the outer peripheral surface of the inner housing.

In some embodiments, the cooling slot is opposite the pole shoe in a radially inward and outward direction of the shaft.

In some embodiments, the liquid inlet is adjacent a lower bottom surface of the cooling cavity and the liquid outlet is adjacent an upper top surface of the cooling cavity.

In some embodiments, the liquid container further comprises a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe is communicated with the liquid inlet, and the liquid outlet pipe is communicated with the liquid outlet.

In some embodiments, the high-speed magnetic liquid sealing device further comprises a shaft sleeve, the shaft sleeve is arranged in the cavity and penetrates through the shaft, and the magnetic liquid is filled between the pole shoe and the shaft sleeve.

In some embodiments, the sleeve is keyed to the shaft, and the inner circumferential surface of the sleeve is provided with a groove extending radially therealong, the groove cooperating with a shoulder stop of the shaft.

In some embodiments, the high-speed magnetic liquid sealing device further comprises a sealing member, wherein the inner circumferential surface of the shaft sleeve is provided with an annular groove, and the sealing member is fitted in the annular groove and is in contact with the outer surface of the shaft.

In some embodiments, the high-speed magnetic liquid sealing device further includes temperature sensors disposed on the housing and adjacent to the upper and lower ends of the cooling cavity for detecting the temperature in the cooling cavity.

Drawings

Fig. 1 is a schematic structural view of the magnetic liquid sealing device of the present invention.

A magnetic liquid sealing device 100;

a housing 1; an outer shell 11; a liquid inlet 111; a liquid outlet 112; an inner housing 12; a chamber 121; a cooling chamber 13;

a shaft 2; a pole shoe 3; a permanent magnet 4;

an extension 5; a cooling tank 51;

a liquid inlet pipe 6; a liquid outlet pipe 7; a shaft sleeve 8; a seal 9; a temperature sensor 10; a first bearing 101; a second bearing 102; a first magnetism isolating ring 103; a second magnetism isolating ring 104.

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.

A magnetic liquid seal device according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, a magnetic fluid sealing apparatus 100 according to an embodiment of the present invention includes a housing 1, a shaft 2, a plurality of pole shoes 3, and a permanent magnet 4.

The housing 1 includes an outer housing 11 and an inner housing 12, the inner housing 12 has a cavity 121, a cooling cavity 13 is defined between the inner housing 12 and the outer housing 11, a liquid inlet 111 and a liquid outlet 112 are arranged on the outer peripheral surface of the outer housing 11, and both the liquid inlet 111 and the liquid outlet 112 are communicated with the cooling cavity 13.

The shaft 2 is rotatably disposed within the chamber 121, and at least one end of the shaft 2 protrudes from the chamber 121.

The plurality of pole shoes 3 are arranged in the cavity 121 and sleeved on the shaft 2, the plurality of pole shoes 3 are arranged at intervals along the axial direction of the shaft 2, the inner circumferential surface of the pole shoes 3 and the outer circumferential surface of the shaft 2 are arranged at intervals along the radial direction of the shaft 2, and the inner circumferential surface of the pole shoes 3 and the outer circumferential surface of the shaft 2 are filled with magnetic liquid. Nothing about the sleeve

The permanent magnet 4 is arranged in the cavity 121 and sleeved on the shaft 2, and the permanent magnet 4 is arranged between the adjacent pole shoes 3. The permanent magnet 4, the pole shoe 3 and the shaft 2 form a closed magnetic circuit, and the permanent magnet 4 is used for generating a non-uniform magnetic field with alternate intensity between the pole shoe 3 and the shaft 2 to adsorb magnetic liquid between the pole teeth and the shaft 2, so that the magnetic liquid is filled in gaps to generate pressure resistance, and the purpose of sealing is achieved.

According to the utility model discloses magnetic liquid sealing device 100, through inject cooling chamber 13 between interior casing 12 and the shell body 11, is equipped with inlet 111 and liquid outlet 112 on the outer peripheral face of shell body 11, and inlet 111 and liquid outlet 112 all communicate with cooling chamber 13. The cooling liquid enters the cooling cavity 13 through the liquid inlet 111 and flows out of the liquid outlet 112, so that the cooling liquid in the cooling cavity 13 exchanges heat with the inner shell 12, the temperature between the shaft 2 and the pole shoe 3 is reduced, the magnetic liquid is prevented from losing efficacy due to overhigh temperature, the performance of the permanent magnet 4 is also prevented from being reduced or losing efficacy in a high-temperature environment, the sustainable normal use of the magnetic liquid sealing device 100 is ensured, and the service life of the magnetic liquid sealing device 100 is prolonged.

In addition, the pole shoe 31 is provided with the cooling cavity, which not only causes the magnetic circuit inside the pole shoe 31 to be damaged, but also increases the axial length of the pole shoe 31 and increases the volume of the magnetic liquid sealing device 100, and the pole shoe 31 is too long, so that the content of the magnetic liquid between the pole shoe 31 and the shaft 2 is also uneven, and the sealing performance of the magnetic liquid sealing device 100 is further influenced, therefore, the cooling cavity 13 is defined between the inner shell 12 and the outer shell 11, the trouble of arranging the cooling groove 51 in the pole shoe 3 is avoided, the integrity of the magnetic circuit inside the pole shoe 31 is ensured, and the axial length of the pole shoe 31 is reduced. Under the same volume, the number of the permanent magnets 4 can be increased in the inner shell 12, the uniformity of the magnetic liquid between the pole shoe 31 and the shaft 2 is ensured, and the sealing performance of the magnetic liquid sealing device 100 is ensured while the magnetic liquid sealing device 100 is cooled.

According to the embodiment of the present invention, the magnetic liquid sealing device 100 is provided with the extension portion 5 extending along the radial direction on the outer peripheral surface of the inner housing 12, and the outer peripheral surface of the extension portion 5 is spaced from the inner peripheral surface of the outer housing 11. Thereby, the flow velocity of the cooling liquid in the cooling chamber 13 is reduced by the extension portion 5, the flow time of the cooling liquid in the cooling chamber 13 is increased, and the heat exchange time of the cooling liquid with the inner case 12 is increased. In addition, heat generated by the shaft 2 and the pole shoe 3 can exchange heat with the cooling liquid through the extension part 5, so that heat diffusion is accelerated, and the utilization rate of the cooling liquid is improved.

In the use, casing 1 accessible bolt mounting is on reation kettle's the cauldron body or on the cell body of stirred tank, and axle 2 links to each other with agitating unit (for example stirring paddle) to the drive agitating unit stirs the material in reation kettle or the stirred tank, and magnetic liquid prevents that the material in reation kettle or the stirred tank from leaking.

In some embodiments, the extension 5 is plural, the plural extensions 5 are provided at intervals in the axial direction of the inner casing 12, and the cooling groove 51 is defined between adjacent extensions 5 and the outer peripheral surface of the inner casing 12. Therefore, the flowing speed of the cooling liquid is further slowed down, the flowing time of the cooling liquid in the cooling cavity 13 is further prolonged, and the cooling efficiency of the cooling liquid is further improved.

In some embodiments, the cooling slot 51 is opposed to the pole piece 3 in a radial inward-outward direction of the shaft 2 (inward-outward direction as shown in fig. 1). When the magnetic liquid sealing device 100 works, a large amount of heat is generated between the shaft 2 and the pole shoe 3, the heat is transferred to the inner housing 12 through the pole shoe 3, and the temperature of the part, matched with the outer peripheral surface of the pole shoe 3, of the inner housing 12 is higher, so that the cooling groove 51 is opposite to the pole shoe 3 in the radial inner and outer directions of the shaft 2, the pole shoe 3 can be effectively cooled, and the temperature of the magnetic liquid sealing device 100 is further reduced.

In some embodiments, the inlet port 111 is adjacent to a lower bottom surface of the cooling chamber 13 and the outlet port 112 is adjacent to an upper top surface of the cooling chamber 13. Thereby, the cooling liquid can be made to flow almost entirely inside the cooling chamber 13, thereby improving the utilization rate of the cooling chamber 13.

In some embodiments, the magnetic liquid sealing device 100 further comprises a liquid inlet pipe 6 and a liquid outlet pipe 7, wherein the liquid inlet pipe 6 is communicated with the liquid inlet 111, and the liquid outlet pipe 7 is communicated with the liquid outlet 112. Specifically, as shown in fig. 1, the liquid inlet pipe 6 is connected or welded to the liquid inlet 111 through a screw thread, and the liquid outlet pipe 7 is connected or welded to the liquid outlet 112 through a screw thread, so that the cooling liquid can enter the cooling cavity 13 through the liquid inlet pipe 6, and the cooling liquid flows out of the cooling cavity 13 from the liquid outlet pipe 7 after heat exchange.

In some embodiments, the magnetic fluid sealing device 100 further comprises a shaft sleeve 8, the shaft sleeve 8 is disposed in the chamber 121 and is arranged on the shaft 2 in a penetrating manner, and the magnetic fluid is filled between the pole piece 3 and the shaft sleeve 8. Specifically, as shown in fig. 1, a shaft sleeve 8 is disposed through the shaft 2, and the plurality of pole shoes 3 and the permanent magnet 4 are sleeved on the shaft sleeve 8, inner circumferential surfaces of the plurality of pole shoes 3 and an outer circumferential surface of the shaft sleeve 8 are disposed at intervals in a radial direction of the shaft sleeve, the magnetic liquid is filled between the inner circumferential surface of the shaft sleeve 8 and the outer circumferential surface of the pole shoe 3, the shaft sleeve 8 can conduct a magnetic material, and the shaft 2 is made of a non-magnetic material. Therefore, the limitation on the material of the shaft 2 is eliminated, and the difficulty and the cost of processing and manufacturing the shaft 2 are reduced.

In some embodiments, the sleeve 8 is keyed to the shaft 2 (not shown). From this, carry out circumference location to axle sleeve 8 through the key-type connection to make axle 2 drive axle sleeve 8 and rotate. The inner circumferential surface of the sleeve 8 is provided with a groove extending in the radial direction thereof, and the groove is matched with the shaft shoulder backstop of the shaft 2. Specifically, as shown in fig. 1, the inner peripheral surface of the lower end of the sleeve 8 is provided with a groove extending in the axial direction thereof, which is fitted with a shoulder of the shaft 2, thereby axially positioning the sleeve 8 and preventing the sleeve 8 from shifting in the axial direction of the shaft 2.

It will be appreciated that the fit between the shaft 2 and the sleeve 8 is not limited thereto, for example, a countersunk hole is provided on the outer circumferential surface of the sleeve 8 to penetrate through the sleeve 8, a threaded hole is provided on the outer circumferential surface of the shaft 2, the countersunk hole is aligned with the threaded hole, and a screw or bolt passes through the countersunk hole to fit with the threaded hole, so that the sleeve 8 is mounted on the shaft 2 with the head of the screw or bolt located within the large hole section of the countersunk hole, i.e., the screw or bolt does not protrude from the outer surface of the sleeve 8.

In some embodiments, the magnetic liquid sealing apparatus 100 further includes a sealing member 9, and the inner circumferential surface of the sleeve 8 is provided with an annular groove, and the sealing member 9 is fitted in the annular groove and is in contact with the outer surface of the shaft 2. By providing the annular groove with the seal 9, the sealing property between the outer peripheral surface of the shaft 2 and the inner peripheral surface of the sleeve 8 is improved.

In some embodiments, the sealing member 9 may be a sealing ring, and it can be understood that the present invention has no limitation on the size, material, and sealing grade of the sealing ring, and can be selected according to actual needs.

In some embodiments, the magnetic liquid sealing apparatus 100 further includes temperature sensors 10, and the temperature sensors 10 are disposed on the housing 1 and adjacent to upper and lower ends of the cooling chamber 13 for detecting the temperature in the cooling chamber 13. Specifically, as shown in fig. 1, the temperature sensor 10 includes a first temperature sensor and a second temperature sensor, both of which are disposed on the inner housing 12, the first temperature sensor is disposed above the cooling chamber 13, and the second temperature sensor is disposed below the cooling chamber 13, so that the temperature of the liquid inlet 111 is detected by the first temperature sensor, and the temperature of the liquid outlet 112 is detected by the second temperature sensor, so that the reading difference between the first temperature sensor and the second temperature sensor is used to adjust the flowing speed of the cooling liquid, thereby improving the cooling efficiency.

Some specific exemplary magnetic fluid seal apparatus 100 according to the present invention are described below with reference to fig. 1.

As shown in fig. 1, the magnetic fluid sealing device 100 includes a housing 1, 4

pole shoes

3, 3 permanent magnets 4, a first magnetism isolating ring 103, a second magnetism isolating ring 104, a first bearing 101, a second bearing 102, a shaft 2 shaft sleeve 8 and a temperature sensor 10.

The shaft 2 is rotatably supported in the housing 1 through the first bearing 101 and the second bearing 102, two ends of the shaft 2 extend out of the housing 1, the shaft sleeve 8 is arranged in the housing 1 and sleeved on the shaft 2, the shaft sleeve 8 is matched with the shaft 2 through a key, a groove extending along the radial direction is arranged at the lower end of the shaft sleeve 8, and the groove is matched with a shaft shoulder backstop of the shaft 2. 4 pole shoes 3, permanent magnet 4, first magnetic isolation ring 103 and second magnetic isolation ring 104 are arranged in the shell 1 and penetrate through the shaft sleeve 8, 4 pole shoes 3 are arranged between the first bearing 101 and the second bearing 102, 4 pole shoes 3 are arranged at intervals along the axial direction of the shaft 2, the permanent magnet 4 is arranged between the adjacent pole shoes 3, the inner circumferential surface of each pole shoe 3 and the outer circumferential surface of the shaft 2 are arranged at intervals, and magnetic liquid is filled between each pole shoe 3 and the shaft sleeve 8. The first bearing 101 is positioned above the 4 pole shoes 3, the second bearing 102 is positioned below the 4 pole shoes, the first magnetism isolating ring 103 is positioned above the first bearing 101 and the 4 pole shoes 3, and the second magnetism isolating ring 104 is positioned between the second bearing 102 and the lower side of the 4 pole shoes 3.

Casing 1 includes outer casing 11 and interior casing 12, prescribe a limit to cooling chamber 13 between outer casing 11 and the interior casing 12, liquid inlet 111 and liquid outlet 112 have on the side of outer casing 11, liquid inlet 111 is connected with feed liquor pipe 6, liquid outlet 112 is connected with drain pipe 7, be equipped with on the outer peripheral face of interior casing 12 along its radial extension 5 that extends, the quantity of extension 5 is 4, and extension 5 sets up along the outer peripheral face interval of interior casing 12, prescribe a limit to cooling bath 51 between the outer peripheral face of adjacent extension 5 and interior casing 12, cooling bath 51 with cooling bath 51 and pole piece 3 in the radial inside and outside orientation of axle 2 relatively. The temperature sensor 10 is plural, and fig. 1 shows 2 temperature sensors 10, 2 temperature sensors being provided on the inner case 12, one temperature sensor 10 being provided above the cooling chamber 13, and the other temperature sensor 10 being provided below the cooling chamber 13.

Therefore, the magnetic liquid sealing device 100 according to the embodiment of the present invention has the advantages of high cooling efficiency, long service life, good sealing performance, etc.

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

1. A high-speed magnetic fluid seal assembly, comprising: the cooling device comprises a shell, wherein the shell comprises an outer shell and an inner shell, the inner shell is provided with a cavity, a cooling cavity is defined between the inner shell and the outer shell, an extending part extending along the radial direction of the inner shell is arranged on the outer peripheral surface of the inner shell, the outer peripheral surface of the extending part and the inner peripheral surface of the outer shell are arranged at intervals, a liquid inlet and a liquid outlet are arranged on the outer peripheral surface of the outer shell, and the liquid inlet and the liquid outlet are both communicated with the cooling cavity; a shaft rotatably disposed within the chamber, at least one end of the shaft extending from the chamber; the pole shoes are arranged in the cavities and sleeved on the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft, and the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are filled with magnetic liquid; the permanent magnet is arranged in the cavity and sleeved on the shaft, and the permanent magnet is arranged between the adjacent pole shoes.

2. The high-speed magnetic liquid seal apparatus according to claim 1, wherein the plurality of extensions are provided at intervals in an axial direction of the inner housing, and a cooling groove is defined between adjacent extensions and the outer peripheral surface of the inner housing.

3. The high-speed magnetic fluid seal apparatus of claim 2, wherein said cooling slot is opposite said pole shoes in a radial inward and outward direction of said shaft.

4. The high-speed magnetic liquid seal apparatus of claim 1, wherein the liquid inlet is adjacent to a bottom surface of the cooling chamber and the liquid outlet is adjacent to a top surface of the cooling chamber.

5. The high-speed magnetic liquid seal apparatus of claim 4, further comprising a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe is in communication with the liquid inlet, and the liquid outlet pipe is in communication with the liquid outlet.

6. The high-speed magnetic fluid seal apparatus of claim 1 further comprising a bushing disposed within said chamber and disposed through said shaft, said magnetic fluid being filled between said pole piece and said bushing.

7. The high-speed magnetic fluid seal apparatus of claim 6, wherein said bushing is keyed to said shaft, and wherein said bushing has an inner circumferential surface with a radially extending groove that engages a shoulder stop of said shaft.

8. The high-speed magnetic liquid seal device according to claim 6, further comprising a seal member, wherein an inner peripheral surface of the sleeve is provided with an annular groove, and the seal member is fitted in the annular groove and is in contact with an outer surface of the shaft.

9. The high-speed magnetic liquid seal device according to any one of claims 1 to 8, further comprising temperature sensors disposed on the housing and adjacent to upper and lower ends of the cooling chamber for detecting a temperature in the cooling chamber.