Rotary sealing structure

Abstract

The utility model relates to the technical field of sealing, in particular to a rotary sealing structure. The rotary sealing structure comprises a sealing cavity and a magnetic fluid sealing assembly arranged on one side plate of the sealing cavity, a rotating shaft is arranged on the magnetic fluid sealing assembly in a penetrating mode, and the rotating shaft extends into one side of the sealing cavity to be used for being connected with a load; the magnetic fluid sealing assembly comprises a shell connected with the side plates, a shaft sleeve arranged in the shell and a magnetic fluid sealing unit located between the shell and the shaft sleeve. The rotating shaft and the shaft sleeve are connected in a sealed mode through a first sealing piece, and the shell and the side plate are connected in a sealed mode through a second sealing piece. By the adoption of the mode, the rotating speed of the rotating shaft can be increased, the needed sealing environment is guaranteed, and the production efficiency and the production stability of equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a rotating sealing structure. Background Art

[0002] Sealing technology plays an important role in many different application scenarios. Almost all systems and devices involving the control of substances such as liquids, gases, and dust need to use sealing technology. Generally speaking, a sealing structure is usually set at a static position or a moving position to play a role in isolating and sealing, so as to ensure the stability during production.

[0003] At present, in vacuum sealing, for the sealing at the rotating position, the sealing technology of rubber rings is usually adopted. However, the main problem with using rubber sealing rings for rotational motion is the Joule effect. Friction between the rotating shaft and the rubber ring generates heat, which will accelerate the aging of the sealing ring, reduce the service life of the rubber ring, and at the same time affect the sealing effect. Therefore, when a rubber sealing ring is used for rotational motion sealing, the rotational speed of the rotating shaft cannot be too high, and the failure frequency of the rubber sealing ring is relatively high, affecting the production efficiency and production stability of the equipment. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a rotating sealing structure that can increase the rotational speed of the rotating shaft and ensure the required sealing environment, so as to improve the production efficiency and production stability of the equipment.

[0005] The utility model discloses a rotating sealing structure, including: a sealing cavity, and a magneto - fluid sealing assembly arranged on one side plate of the sealing cavity. The magneto - fluid sealing assembly penetrates through a rotating shaft, and the rotating shaft extends into one side of the sealing cavity for connecting a load; the magneto - fluid sealing assembly includes a housing connected to the side plate, a shaft sleeve arranged in the housing, and a magneto - fluid sealing unit located between the housing and the shaft sleeve; the rotating shaft and the shaft sleeve are hermetically connected through a first seal, and the housing and the side plate are hermetically connected through a second seal.

[0006] Optionally, one end of the rotating shaft extending into the sealing cavity is connected with a connecting arm, the load is located at one end of the connecting arm away from the rotating shaft, and the connecting arm forms a preset angle with the rotating shaft. A counterweight assembly is arranged at one end of the rotating shaft away from the sealing cavity, and the extending direction of the counterweight assembly is opposite to the extending direction of the connecting arm.

[0007] Optionally, the counterweight assembly includes a mounting plate connected to the rotating shaft, and at least one counterweight block arranged on the mounting plate.

[0008] Optionally, a first flange is provided at one end of the rotating shaft extending into the sealed cavity, and a second flange is provided at one end of the connecting arm. The first flange is connected to the second flange. On the side of the first flange facing the side plate, an annular protrusion is provided, and a first annular groove is provided on the annular protrusion. The first seal is located in the first annular groove, and the first seal abuts and seals against the shaft sleeve.

[0009] Optionally, the housing includes an annular base and an annular outer edge provided at the edge of the annular base. A second annular groove is provided on the annular outer edge. The second seal is located in the second annular groove, and the second seal abuts and seals against the side plate. The magnetic fluid sealing unit and the shaft sleeve are respectively located inside the inner circle of the annular base.

[0010] Optionally, bearings are provided between the shaft sleeve and the annular base, and the bearings are respectively located at opposite ends of the shaft sleeve. The magnetic fluid sealing unit is located between the two bearings.

[0011] Optionally, the magnetic fluid sealing unit includes a permanent magnet provided in the annular base, and pole pieces respectively provided on opposite sides of the permanent magnet. A gap is formed between the pole pieces and the outer circle of the shaft sleeve, and the gap is filled with magnetic fluid. The magnetic fluid is held in the gap by the magnetic flux generated by the permanent magnet.

[0012] Optionally, a plurality of annular grooves are spacedly provided on the side of the pole piece facing the shaft sleeve, so that when the shaft sleeve rotates relative to the annular base, the magnetic fluid is held at the annular grooves.

[0013] Optionally, a spacer is provided between the pole piece and the bearing for blocking the leakage of magnetic flux from the pole piece.

[0014] Optionally, a driving device is further provided on the side plate, a transmission wheel is provided on the rotating shaft, and the transmission wheel is in transmission connection with the driving device.

[0015] Compared with the prior art, the beneficial effects of the rotating seal structure provided by the embodiment of the present utility model are as follows: By arranging a magnetorheological fluid seal assembly on one side plate of the seal cavity and passing a rotating shaft through the magnetorheological fluid seal assembly, when the rotating shaft rotates, the bushing of the magnetorheological fluid seal assembly rotates synchronously with the housing, and the housing of the magnetorheological fluid seal assembly is connected to the side plate to ensure the stability of the installation position. At this time, only the first seal and the second seal need to be respectively arranged at the relatively stationary connection parts to avoid the temperature rise loss caused by rotation. When setting, only the rotating shaft and the bushing need to be sealed and connected through the first seal, and the housing and the side plate need to be sealed and connected through the second seal. The magnetorheological fluid seal unit between the bushing and the housing can still ensure the sealing effect through the magnetorheological fluid under the high-speed rotation of the rotating shaft, and there will be no problem of seal failure caused by wear under the rotation of the rotating shaft. By adopting the above method, the rotation speed of the rotating shaft can be increased, and the required sealing environment can be ensured to improve the production efficiency and production stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solutions of the present utility model will be further described in detail below with reference to the drawings and embodiments. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the rotating seal structure provided by the embodiment of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the magnetorheological fluid seal assembly provided by the embodiment of the present utility model;

[0019] Figure 3 is a cross-sectional view of the rotating seal structure provided by the embodiment of the present utility model;

[0020] Figure 4 is Figure 3 a partial enlarged view of part A in

[0021] The reference numerals in the drawings are as follows:

[0022] 100, rotating seal structure; 105, load; 110, side plate; 120, magnetorheological fluid seal assembly; 122, housing; 1222, annular base; 1224, annular outer edge; 1224a, second annular groove; 124, bushing; 126, magnetorheological fluid seal unit; 1262, permanent magnet; 1264, pole piece; 1265, gap; 1266, spacer; 128, bearing; 130, rotating shaft; 132, first flange; 134, annular protrusion; 136, transmission wheel; 140, first seal; 150, second seal; 160, connecting arm; 162, second flange; 170, counterweight assembly; 172, mounting plate; 174, counterweight block; 180, driving device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model will be described in detail.

[0024] As Figures 1 to 4 shown, an embodiment of the present utility model provides a rotational sealing structure 100, including: a sealing cavity, and a magnetorheological fluid sealing assembly 120 disposed on a side plate 110 of the sealing cavity. A rotating shaft 130 passes through the magnetorheological fluid sealing assembly 120, and the rotating shaft 130 extends into one side of the sealing cavity for connecting a load 105; the magnetorheological fluid sealing assembly 120 includes a housing 122 connected to the side plate 110, a bushing 124 disposed in the housing 122, and a magnetorheological fluid sealing unit 126 located between the housing 122 and the bushing 124; a first seal 140 is used for sealing connection between the rotating shaft 130 and the bushing 124, and a second seal 150 is used for sealing connection between the housing 122 and the side plate 110.

[0025] Specifically, the sealing cavity is used for processing corresponding products. During the processing of the products, the load 105 needs to be driven to rotate by the rotating shaft 130. By disposing the magnetorheological fluid sealing assembly 120 on a side plate 110 of the sealing cavity and passing the rotating shaft 130 through the magnetorheological fluid sealing assembly 120, when the rotating shaft 130 rotates, the bushing 124 of the magnetorheological fluid sealing assembly 120 rotates synchronously relative to the housing 122, and the housing 122 of the magnetorheological fluid sealing assembly 120 is connected to the side plate 110 to ensure the stability of the installation position. At this time, only the first seal 140 and the second seal 150 need to be respectively disposed at the relatively stationary connection positions to avoid the temperature rise loss caused by rotation. When setting, only the first seal 140 is used for sealing connection between the rotating shaft 130 and the bushing 124, and the second seal 150 is used for sealing connection between the housing 122 and the side plate 110. The magnetorheological fluid sealing unit 126 between the bushing 124 and the housing 122 can still ensure the sealing effect through the magnetorheological fluid under the high-speed rotation of the rotating shaft 130, and there will be no problem of sealing failure caused by wear under the rotation of the rotating shaft 130. By adopting the above method, the rotation speed of the rotating shaft 130 can be increased, and the required sealing environment can be ensured to improve the production efficiency and production stability of the equipment.

[0026] It should be noted that the present application embodiment does not make specific limitations on the first seal 140 and the second seal 150. For example, the first seal 140 and the second seal 150 can adopt O-rings, or can also adopt sealing rings with a cross-sectional area in the shape of Y or X, as long as the required sealing effect can be ensured.

[0027] As Figure 1As shown in the figure, one end of the rotating shaft 130 extending into the sealed cavity is connected with a connecting arm 160. The load 105 is located at one end of the connecting arm 160 away from the rotating shaft 130, and the connecting arm 160 forms a preset angle with the rotating shaft 130. One end of the rotating shaft 130 away from the sealed cavity is provided with a counterweight assembly 170, and the extending direction of the counterweight assembly 170 is set opposite to the extending direction of the connecting arm 160.

[0028] Specifically, by arranging the load 105 at one end of the connecting arm 160 away from the rotating shaft 130, and the connecting arm 160 forms a preset angle with the rotating shaft 130. When the rotating shaft 130 drives the connecting arm 160 to rotate, the load 105 has a greater linear velocity and a greater centrifugal force, which is beneficial to improving the processing efficiency. In addition, since the above setting form makes the load 105 deviate from one side of the rotating shaft 130, in order to ensure the stability of the rotating shaft 130 during rotation, a counterweight assembly 170 needs to be arranged at one end of the rotating shaft 130 away from the sealed cavity. The extending direction of the counterweight assembly 170 is set opposite to the extending direction of the connecting arm 160, which can make the mass distribution on the rotating shaft 130 more uniform, thereby reducing vibration, being more stable during high-speed rotation, reducing the possibility of deviating from the axis, reducing energy loss, and extending the service life.

[0029] As Figure 3 shown in the figure, the counterweight assembly 170 includes a mounting plate 172 connected to the rotating shaft 130, and at least one counterweight block 174 arranged on the mounting plate 172.

[0030] Specifically, due to the different weights of the load 105, the required weights for the counterweight are also different. In order to ensure the matching degree between the counterweight assembly 170 and the load 105, at least one counterweight block 174 is arranged on the mounting plate 172 to meet the required counterweight demand. In actual applications, counterweight blocks 174 with different weights can be set to adjust the required counterweight.

[0031] As Figure 1 and Figure 3 shown in the figure, one end of the rotating shaft 130 extending into the sealed cavity is provided with a first flange 132, one end of the connecting arm 160 is provided with a second flange 162, and the first flange 132 is connected to the second flange 162; a circular protrusion 134 is arranged on one side of the first flange 132 facing the side plate 110, a first circular groove is arranged on the circular protrusion 134, the first seal 140 is located in the first circular groove, and the first seal 140 abuts and seals against the shaft sleeve 124.

[0032] Specifically, the first flange 132 and the second flange 162 can be connected by bolts. Adopting the above form can simplify the connection form between the rotating shaft 130 and the connecting arm 160 and facilitate disassembly and maintenance. In addition, by providing an annular protrusion 134 on the side of the first flange 132 facing the side plate 110, the annular protrusion 134 can abut against one end of the bushing 124 extending into the sealed cavity, so that a preset distance is provided between the first flange 132 and the side plate 110 to prevent interference between the first flange 132 and the side plate 110 during rotation. At the same time, by providing a first annular groove on the annular protrusion 134, the first seal 140 is located in the first annular groove. When the annular protrusion 134 can abut against one end of the bushing 124 extending into the sealed cavity, the first seal 140 is clamped between the bushing 124 and the annular protrusion 134, thereby achieving a sealing effect.

[0033] Optionally, the housing 122 includes an annular base 1222 and an annular outer edge 1224 provided at the edge of the annular base 1222. A second annular groove 1224a is provided on the annular outer edge 1224. The second seal 150 is located in the second annular groove 1224a, and the second seal 150 abuts against and seals the side plate 110. The magnetorheological fluid sealing unit 126 and the bushing 124 are respectively located inside the inner circle of the annular base 1222.

[0034] Specifically, the annular base 1222 can be inserted into the side plate 110 and fixedly connected to the side plate 110 through the annular outer edge 1224. The annular outer edge 1224 and the side plate 110 can be fixedly connected by bolts. By providing a second annular groove 1224a on the annular outer edge 1224, the second seal 150 is located in the second annular groove 1224a. When the annular outer edge 1224 is connected to the side plate 110, the second seal 150 is clamped between the annular outer edge 1224 and the protrusion of the side plate 110, thereby achieving a sealing effect. The magnetorheological fluid sealing unit 126 and the bushing 124 are respectively located inside the inner circle of the annular base 1222, which facilitates the arrangement of the magnetorheological fluid sealing unit 126 and the bushing 124.

[0035] As Figure 3 and Figure 4 shown, a bearing 128 is provided between the bushing 124 and the annular base 1222, and the bearings 128 are respectively located at opposite ends of the bushing 124. The magnetorheological fluid sealing unit 126 is located between the two bearings 128.

[0036] Specifically, by placing the bearings 128 at opposite ends of the bushing 124 respectively, when the rotating shaft 130 is arranged through the bushing 124, the bearings 128 play a radial supporting role for the bushing 124, which is beneficial to ensuring the smoothness during rotation and can also avoid affecting the magnetorheological fluid sealing unit 126 and ensure the required sealing effect. In addition, by arranging the weight component 170 on the rotating shaft 130, the force transmitted to the bearings 128 is more balanced, which is beneficial to extending the service life of the bearings 128.

[0037] As Figure 3 and Figure 4 shown, the magnetorheological fluid sealing unit 126 includes a permanent magnet 1262 arranged in the annular base 1222, and pole pieces 1264 respectively arranged on opposite sides of the permanent magnet 1262. A gap 1265 is formed between the pole pieces 1264 and the outer ring of the bushing 124, and the gap 1265 is filled with magnetorheological fluid, and the magnetorheological fluid is kept in the gap 1265 by the magnetic flux generated by the permanent magnet 1262.

[0038] Specifically, the permanent magnet 1262 serves as a magnetic flux generating unit, and the pole pieces 1264 serve as magnetic flux transmission units. The permanent magnet 1262 generates magnetic flux, and the corresponding pole pieces 1264, bushing 124 and magnetorheological fluid transmit the magnetic flux to form a magnetic circuit. Among them, the pole pieces 1264 are annular, arranged on both sides across the permanent magnet 1262 in the axial direction, and the pole pieces 1264 are made of magnetic materials. The outer periphery of the pole pieces 1264 is fixedly connected to the inner peripheral surface of the annular base 1222, and the inner periphery of the pole pieces 1264 forms the above-mentioned gap 1265 with the outer ring of the bushing 124. The magnetorheological fluid can use a surfactant to disperse magnetic ultrafine particles with a particle size of about 5nm to 50nm in a solvent or oil (base oil) to move along the magnetic flux and has the characteristic of being trapped by the magnetic field. The magnetorheological fluid can ensure the sealing between the pole pieces 1264 and the outer peripheral surface of the bushing 124.

[0039] In an alternative embodiment of the present application, a plurality of annular grooves are arranged at intervals on the side of the pole piece 1264 facing the bushing 124, so that when the bushing 124 rotates relative to the annular base 1222, the magnetorheological fluid is kept at the annular grooves.

[0040] Adopting the above form, a liquid "O" - type seal can be formed at the annular grooves without solid - contact wear. On the premise that the bearings 128 are not damaged, the required sealed environment can be stably maintained.

[0041] As Figure 4 shown, a spacer 1266 is arranged between the pole piece 1264 and the bearing 128 to block the leakage of magnetic flux from the pole piece 1264.

[0042] Specifically, by providing a spacer 1266 between the magnetic pole piece 1264 and the bearing 128, the magnetic fluid can be stably maintained at a position corresponding to the magnetic pole piece 1264, preventing leakage of the magnetic fluid and facilitating ensuring stability during use.

[0043] As Figure 1 shown, a driving device 180 is further provided on the side plate 110, and a transmission wheel 136 is provided on the rotating shaft 130. The transmission wheel 136 is in transmission connection with the driving device 180.

[0044] Specifically, the driving device 180 can adopt a reduction motor, and the transmission wheel 136 can adopt a sprocket or a belt pulley. When the transmission wheel 136 adopts a sprocket, a corresponding sprocket is also connected to the driving device 180 for connection by a chain. When the transmission wheel 136 adopts a belt pulley, a corresponding belt pulley is also connected to the driving device 180 for connection by a belt.

[0045] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some of the technical features can be equivalently replaced; and all such modifications and replacements should fall within the protection scope of the appended claims of the present invention.

Claims

1. A rotary sealing structure, characterized in that: include: A sealed cavity, and a magnetic fluid sealing assembly arranged on a side plate of the sealed cavity, wherein the magnetic fluid sealing assembly is penetrated by a rotating shaft, and the rotating shaft extends into one side of the sealed cavity for connecting a load; the magnetic fluid sealing assembly comprises a shell connected to the side plate, a shaft sleeve arranged in the shell, and a magnetic fluid sealing unit located between the shell and the shaft sleeve; the rotating shaft and the shaft sleeve are sealed and connected by a first sealing member, and the shell and the side plate are sealed and connected by a second sealing member.

2. The rotary sealing structure according to claim 1, characterized in that: One end of the rotating shaft extending into the sealed cavity is connected to a connecting arm, the load is located at the end of the connecting arm away from the rotating shaft, and the connecting arm and the rotating shaft form a preset angle, and a counterweight assembly is provided at the end of the rotating shaft away from the sealed cavity, and the extension direction of the counterweight assembly is opposite to the extension direction of the connecting arm.

3. The rotary sealing structure according to claim 2, characterized in that: The counterweight assembly includes a mounting plate connected to the rotating shaft, and at least one counterweight block arranged on the mounting plate.

4. The rotary seal structure according to claim 3, characterized in that: A first flange is provided at one end of the rotating shaft extending into the sealing cavity, and a second flange is provided at one end of the connecting arm, and the first flange is connected to the second flange; an annular protrusion is provided on the side of the first flange facing the side plate, and a first annular groove is provided on the annular protrusion, the first sealing member is located in the first annular groove, and the first sealing member is sealed against the sleeve.

5. The rotary sealing structure according to any one of claims 1 to 4, characterized in that: The shell includes an annular base and an annular outer edge arranged on the edge of the annular base, a second annular groove is arranged on the annular outer edge, the second sealing member is located in the second annular groove, and the second sealing member is sealed against the side plate, and the magnetic fluid sealing unit and the sleeve are respectively located on the inner ring of the annular base.

6. The rotary seal structure according to claim 5, characterized in that: Bearings are arranged between the shaft sleeve and the annular base, and the bearings are respectively located at two opposite ends of the shaft sleeve, and the magnetic fluid sealing unit is located between the two bearings.

7. The rotary seal structure according to claim 6, characterized in that: The magnetic fluid sealing unit includes a permanent magnet arranged in the annular base, and pole pieces arranged on opposite sides of the permanent magnet, wherein a gap is formed between the pole piece and the outer ring of the sleeve, and the gap is filled with magnetic fluid, and the magnetic fluid is maintained in the gap by the magnetic flux generated by the permanent magnet.

8. The rotary seal structure according to claim 7, characterized in that: A plurality of annular grooves are arranged at intervals on one side of the magnetic pole piece facing the shaft sleeve, so that when the shaft sleeve rotates relative to the annular base, the magnetic fluid is retained in the annular grooves.

9. The rotary seal structure according to claim 8, characterized in that: A spacer is provided between the pole piece and the bearing to prevent magnetic flux from leaking from the pole piece.

10. The rotary sealing structure according to any one of claims 1 to 4, characterized in that: The side plate is also provided with a driving device, the rotating shaft is provided with a transmission wheel, and the transmission wheel is in driving connection with the driving device.

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