Sealing device

Abstract

The utility model relates to the technical field of fluid sealing, in particular to a sealing device, and aims to solve the problem of how to improve the sealing effect of the sealing device. In order to achieve the purpose, the sealing device is installed between a rotating component and a static component and used for sealing fluid, the sealing device comprises a first ring body, the first ring body is used for being fixed to the outer surface of the rotating component and synchronously rotating along with the rotating component, and the first ring body comprises a first surface and a second surface opposite to the first surface; the first surface faces the fluid side; wherein the second surface is provided with a plurality of annular grooves or annular protrusions, and the annular grooves or the annular protrusions are arranged at intervals in the radial direction of the first ring body, so that when the first ring body abuts against the end face of the static component, labyrinth sealing is formed between the second surface and the end face of the static component through the annular grooves or the annular protrusions. According to the sealing device, the fluid leakage risk can be reduced, and the sealing effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid sealing, and specifically provides a sealing device. BACKGROUND

[0002] In industrial applications, the sealing device is a key functional component installed between a stationary component and a rotating component, which is used to prevent fluid from leaking from the gap between the stationary component and the rotating component.

[0003] In some related technologies in the field, the sealing device installed between the stationary component and the rotating component is generally in the form of a mechanical sealing ring, an oil seal, a gas seal or a magnetic fluid seal, and the above forms can play a certain sealing role, but for high-speed rotating occasions, the sealing effect is still poor due to the single sealing mode and the wear of the sealing element.

[0004] Correspondingly, there is a need for a new technical solution to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The present application aims to solve the above technical problems, i.e., to solve the problem of how to improve the sealing effect of the sealing device.

[0006] In a first aspect, the present application provides a sealing device installed between a rotating component and a stationary component, used for sealing fluid, the sealing device comprising:

[0007] a first ring body used for being fixed to the outer surface of the rotating component and rotating synchronously with the rotating component, the first ring body comprising a first surface and a second surface opposite to the first surface, the first surface facing the side where the fluid is located;

[0008] wherein a plurality of annular grooves or annular protrusions are arranged on the second surface, and the plurality of annular grooves or annular protrusions are arranged along the radial direction of the first ring body, so that, in the state of abutting the end face of the stationary component, the second surface and the end face of the stationary component form a labyrinth seal through the annular grooves or the annular protrusions.

[0009] In one technical solution of the above sealing device, an edge of the first surface away from the axis of the first ring body is provided with a stop portion, and the stop portion is arranged along the circumferential direction of the first ring body.

[0010] In one technical solution of the above sealing device, the stop portion has a flow guide surface, and the flow guide surface is smoothly connected with the first surface, so that the fluid close to the first surface can flow along the flow guide surface in the direction away from the second surface under the action of centrifugal force.

[0011] In one of the sealing devices, a surface of the first ring body abutting against the rotating component is provided with a groove in the circumferential direction, and a sealing ring is arranged in the groove.

[0012] In one of the sealing devices, the sealing device further comprises:

[0013] a second ring body arranged close to the second surface, the second ring body comprising a main body and a sealing lip connected to the main body;

[0014] the main body is fixed to the rotating component, and the sealing lip abuts against the stationary component; or

[0015] the main body is fixed to the stationary component, and the sealing lip abuts against the rotating component.

[0016] In one of the sealing devices, the first ring body is provided with a cylinder body extending from the second surface towards a direction away from the first surface;

[0017] In one of the sealing devices, the main body is fixedly arranged on an outer surface of the cylinder body, and the sealing lip abuts against the stationary component.

[0018] In one of the sealing devices, the sealing lip is arranged at an angle with the radial direction of the first ring body, and the sealing lip is inclined towards the second surface, and a cavity is formed between the sealing lip and the main body.

[0019] In one of the sealing devices, the sealing device further comprises:

[0020] a support ring sleeved on the cylinder body, and the support ring is located between the second surface and the sealing lip, and the support ring abuts against the second surface and the sealing lip respectively.

[0021] In one of the sealing devices, the sealing device further comprises a stop ring, the stop ring abuts against an end surface of the cylinder body away from the second surface, so as to axially position the second ring body.

[0022] In one of the sealing devices, the sealing device further comprises a magnetic fluid sealing assembly, the magnetic fluid sealing assembly is located on a side of the first ring body away from the fluid, and the second ring body is located between the second surface and the magnetic fluid sealing assembly, and the magnetic fluid sealing assembly comprises:

[0023] a permanent magnet;

[0024] magnetic conducting rings arranged on two sides of the permanent magnet respectively;

[0025] A magnetic fluid is arranged between the magnetic conductive ring and the outer surface of the rotating component.

[0026] In the case of the above technical solution, when the rotating component and the first ring body are in a high-speed rotating state, the fluid in the equipment cavity approaches the first ring body, and there is a friction force between the fluid attached to the first surface and the first surface. At this time, under the action of centrifugal force, the fluid flows in the radial outward direction along the first surface, thereby moving away from the contact surface between the first ring body and the rotating component. That is, during the operation of the equipment, when the fluid approaches the first ring body, the fluid will automatically "swing away" from the above contact surface after contacting the first surface, thereby reducing the probability of fluid leakage between the inner surface of the first ring body and the rotating component and improving the sealing performance between the first ring body and the rotating component.

[0027] Meanwhile, when the fluid enters between the second surface and the stationary component from the outer edge of the first ring body, due to the existence of the above-mentioned labyrinth seal, the leakage path of the fluid is prolonged. When the fluid passes through the labyrinth seal, the kinetic energy and pressure of the fluid gradually decrease due to the winding flow channel formed by the labyrinth seal, so that the fluid lacks the power necessary for leakage, thereby reducing the leakage probability of the fluid. In addition, the labyrinth seal as a whole extends along the radial direction of the first ring body. Therefore, when the fluid stays between the second surface and the stationary component due to the lack of leakage power, the fluid will also be affected by the centrifugal force and move in the radial outward direction of the first ring body, thereby being "swung away" again into the chamber of the equipment and returning to the fluid side. In this way, through the joint action of the first surface and the second surface of the first ring body on the fluid, the fluid leakage risk can be reduced, and the sealing effect of the sealing device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0029] Figure 1 is a sectional view of a sealing device according to an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of an application scenario of a sealing device according to an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of an application scenario of a sealing device according to another embodiment of the present application.

[0032] In the drawings, the reference signs refer to the following:

[0033] 1, first ring body; 11, first surface; 12, second surface; 121, annular groove; 13, stop; 131, flow guide surface; 14, groove; 15, sealing ring; 16, cylinder; 2, second ring body; 21, main body; 22, sealing lip; 23, recess; 24, retaining ring; 3, magnetic fluid sealing assembly; 31, permanent magnet; 32, magnetic conducting ring; 33, magnetic fluid; 4, support ring;

[0034] 100, rotating part; 200, stationary part; 300, first bearing; 310, in-cabin area; 320, out-cabin area; 400, second bearing; 410, liquid supply chamber; 420, liquid receiving chamber. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art will understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.

[0036] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0038] Reference Figure 1 A cross-sectional view of a sealing device according to an embodiment of the present application, the sealing device of the present application is mounted between a rotating part 100 and a stationary part 200 to seal a fluid in a running device. Among them, corresponding to the actual engineering application, according to the type of equipment, the rotating part 100 can be a solid shaft, a hollow shaft or other rotating shaft, and the stationary part 200 can be a casing around the rotating shaft in the main body of the equipment, such as an end cover, a shell or other parts fixed relative to the ground. The above-mentioned "fluid" includes but is not limited to liquid, gas, gas-liquid mixed medium, particulate matter, etc.

[0039] The sealing device comprises a first ring body 1, a second ring body 2 and a magnetic fluid sealing assembly 3 arranged in sequence along the axial direction of the rotating part 100.

[0040] The first ring body 1 is closest to the side where the fluid is located (i.e. the sealed side, the left side in the figure), and comprises a first surface 11 and a second surface 12 opposite to the first surface 11, the first surface 11 facing the side where the fluid is located. In the case where the sealing device is installed, the first ring body 1 is fixed to the outer surface of the rotating part 100, and rotates synchronously with the rotating part 100 during the rotation of the rotating part 100. It can be understood that, when the rotating part 100 is a solid shaft, the inner surface of the first ring body 1 needs to be sealed with the solid shaft. Therefore, when the rotating part 100 and the first ring body 1 are rotating at a high speed, the fluid in the cavity of the device approaches the first ring body 1, and the fluid attached to the first surface 11 is subjected to a frictional force between the fluid and the first surface 11. At this time, under the action of centrifugal force, the fluid flows in the radial outward direction along the first surface 11, thereby moving away from the contact surface between the first ring body 1 and the rotating part 100. That is, during the operation of the device, when the fluid approaches the first ring body 1, the fluid will automatically "throw away" the above contact surface after contacting the first surface 11, thereby reducing the probability of fluid leakage between the inner surface of the first ring body 1 and the rotating part 100, and improving the sealing performance between the first ring body 1 and the rotating part 100.

[0041] A plurality of annular grooves 121 are formed on the second surface 12, the diameters of the annular grooves 121 are different, and the annular grooves 121 are arranged in a radial direction of the first ring body 1. Based on this, when the first ring body 1 abuts against the end surface of the stationary part 200, the annular grooves 121 form a labyrinth seal with the end surface of the stationary part 200. In this way, during the operation of the device, when the fluid enters between the second surface 12 and the stationary part 200 from the outer edge of the first ring body 1, the leakage path of the fluid is prolonged due to the existence of the labyrinth seal, and the kinetic energy and pressure of the fluid gradually decrease when the fluid passes through the winding flow channel formed by the labyrinth seal, so that the fluid lacks the power necessary for leakage, thereby reducing the probability of fluid leakage. In addition, the labyrinth seal extends in the radial direction of the first ring body 1 as a whole, and when the fluid stays between the second surface 12 and the stationary part 200 due to the lack of leakage power, the fluid will also be subjected to the action of centrifugal force and move in the radial outward direction of the first ring body 1, thereby being "thrown away" again into the cavity of the device and returning to the fluid side.

[0042] It should be noted that in actual application, the end surface of the stationary part 200 can also be provided with a ring-shaped protrusion matched with the annular groove 121, and the ring-shaped protrusion is inserted into the annular groove 121, so that the leakage space of the fluid is further reduced, and the sealing effect of the labyrinth seal is improved. Of course, in other ways, a ring-shaped protrusion can also be provided on the second surface 12, and an annular groove 121 can be provided on the end surface of the stationary part 200, and a person skilled in the art can select a specific way according to actual needs, as long as the labyrinth seal between the second surface 12 and the stationary part 200 can be formed.

[0043] As described above, the present application takes the first ring body 1 as the first sealing close to the fluid side, and the centrifugal force formed when the fluid contacts the first ring body 1 is used to throw the fluid away, and the labyrinth seal formed between the second surface 12 and the stationary part is used to prolong the movement path required for fluid leakage and dissipate the kinetic energy in the process of fluid leakage, thereby reducing the risk of fluid leakage and improving the sealing effect.

[0044] Optionally, for the first ring body 1, the edge of the first surface 11 away from the axis of the first ring body 1 is fixedly provided with a stop portion 13, and the stop portion 13 is arranged along the circumference of the first ring body 1 to form a ring-shaped structure. In actual production and processing, the stop portion 13 can be integrally formed and processed with the first ring body 1. By arranging the stop portion 13, the movement path of the fluid is changed when the fluid moves outward along the first surface 11 and is blocked by the stop portion 13, so that a large amount of fluid can be prevented from moving toward the side where the second surface 12 is located after being thrown away from the first surface 11, thereby reducing the possibility of fluid leakage from the gap between the second surface 12 and the stationary part 200.

[0045] Further, the stop portion 13 is further provided with a flow guide surface 131 facing the axis direction of the first ring body 1, and the flow guide surface 131 can be an inclined plane or a curved surface, and the flow guide surface 131 is smoothly connected with the first surface 11, so that the fluid close to the first surface 11 can flow in the opposite direction away from the second surface 12 under the action of the centrifugal force. It should be noted that the flow guide surface 131 is arranged as an inclined surface or a curved surface which is smoothly connected with the first surface 11, and the purpose is to control the flow direction of the fluid. Under the guidance of the flow guide surface 131, the fluid will move in a direction substantially parallel to the axis of the first ring body 1 away from the first ring body 1 after leaving the flow guide surface 131, so that the fluid behind the fluid leaving the flow guide surface 131 is less affected, and the fluid moving along the first surface 11 can be prevented from suddenly moving in the opposite direction after encountering the stop portion 13, so that the fluid close to the first surface 11 is disturbed, thereby adversely affecting the fluid seal.

[0046] In order to improve the sealing between the first ring body 1 and the rotating part 100, a groove 14 is arranged on the surface of the first ring body 1 and the rotating part 100 in the circumferential direction, and a sealing ring 15 is arranged in the groove 14, and the sealing performance is improved by the pressing force between the sealing ring 15 and the rotating part 100.

[0047] It should be noted that the position of the groove 14 can be determined according to the connection relationship between the first ring body 1 and the rotating part 100. For example, when the rotating part 100 is a solid shaft in the Figure 1 , the groove 14 is arranged on the inner surface of the first ring body 1. When the rotating part 100 is a hollow shaft, and the hollow shaft cooperates with the outer surface of the first ring body 1, the groove 14 is arranged on the outer surface of the first ring body 1.

[0048] Referring to Figure 1 , the second ring body 2 is the second sealing of the sealing device, which is arranged on the side close to the second surface, and the second ring body 2 comprises a main body 21 and a sealing lip 22 fixedly connected to the main body 21. According to the actual application, the second ring body 2 can be fixed on the rotating part 100, and at this time, the sealing lip 22 abuts against the stationary part 200, and a linear seal is formed between the sealing lip 22 and the stationary part 200. The second ring body 2 can also be fixed on the stationary part 200, and at this time, the sealing lip 22 abuts against the rotating part 100, and a linear seal is also formed.

[0049] In Figure 1 , the first ring body 1 is provided with a cylinder 16 extending from the second surface 12 to the direction away from the first surface 11, the inner diameter of the cylinder 16 is the same as the inner diameter of the first ring body 1, and the cylinder 16 can be integrally formed with the first ring body 1 (the cylinder 16 and the first ring body 1 can also be regarded as the same component, and in order to facilitate the description, the two are distinguished in this application), the main body 21 is fixedly arranged on the outer surface of the cylinder 16, and the sealing lip 22 abuts against the stationary part 200 (the cylinder 16 is equivalent to the rotating part 100 being fixed, and thus the second ring body 2 is equivalent to being fixed on the rotating part).

[0050] In some embodiments, the main body 21 can be made of a rigid material, and the sealing lip 22 can be made of an elastic material, so that the assembly of the second ring body 2 and other components is realized by the main body 21, and the sealing lip 22 is in elastic contact with the surface of the stationary part 200, so as to facilitate the adjustment of the pressing force between the sealing lip 22 and the stationary part 200. Alternatively, the extension direction of the sealing lip 22 is arranged at an angle with the radial direction of the first ring body 1, specifically, the sealing lip 22 is inclined toward the second surface 12, so that a “V”-shaped recess 23 can be formed between the sealing lip 22 and the main body 21, and thus the sealing lip 22 can deform toward the side of the recess 23 around its root when subjected to pressure, so as to adjust its deformation amount according to the pressure, thereby realizing self-compensation.

[0051] In one embodiment, a support ring 4 is further arranged between the sealing lip 22 and the second surface 12, which can be made of elastic material, such as rubber, silicone or the like, and abuts against the second surface 12 and the sealing lip 22 respectively. During the operation of the device, the relative displacement between the sealing lip 22 and the stationary part 200 may

[0052] Of course, based on the above principle, in some embodiments, a support part, such as a spring, a rubber ring or the like, can be arranged in the recess 23 to control the pre-tightening force of the other side of the sealing lip 22.

[0053] With reference to Figure 1 Optionally, a retaining ring 24 is further sleeved on the rotating part 100, which abuts against the end face of the cylinder 16 away from the second surface 12, so as to axially position the second ring body 2 during the installation of the second ring body 2, and also limit the axial displacement of the second ring body 2 during the operation of the device.

[0054] With reference to Figure 1 The magnetic fluid sealing assembly 3 is located at the side farthest from the fluid, which comprises a permanent magnet 31, a magnetic conducting ring 32 and a magnetic fluid 33. The permanent magnet 31 is fixed on the stationary part 200, and one magnetic conducting ring 32 is arranged on each side of the permanent magnet 31. The magnetic fluid 33 is located in the sealing gap between the magnetic conducting ring 32 and the outer surface of the rotating part 100. The permanent magnet 31 provides a stable magnetic field, and the magnetic conducting ring 32 concentrates the magnetic field to form a high-strength magnetic field between the magnetic conducting ring 32 and the rotating part 100, so that the magnetic fluid in the sealing gap between the magnetic conducting ring 32 and the rotating part 100 is magnetized and arranged along the magnetic force lines to form a "liquid O-ring" under the constraint of the magnetic field, so as to achieve the sealing effect. The principle of magnetic fluid sealing is a known technology in the art, and will not be described in detail herein.

[0055] With reference to Figure 2This is a schematic diagram of an application scenario of a sealing device according to an embodiment of the present application. In this embodiment, the sealing device is applied to a bearing sealing application. At this time, the rotating component 100 is a solid rotating shaft, and the stationary component 200 is a component such as the end cap of the chamber to be sealed. A first bearing 300 is provided between the solid rotating shaft and the end cap. The left side of the rotating component 100 is the chamber interior area 310, and the right side is the chamber exterior area 320. At this time, the sealing performance of the first bearing 300 alone is far from meeting the requirements, and the fluid will also affect the performance of the first bearing 300. Therefore, a sealing device needs to be installed on the left side of the first bearing 300.

[0056] Reference Figure 3 This is a schematic diagram illustrating an application scenario of a sealing device according to another embodiment of this application. In this embodiment, the sealing device is applied in a rotary liquid supply application. (See attached diagram.) Figure 3 As shown, the rotating component 100 is a hollow shaft, and the stationary component 200 is a sleeve. At this time, the rotating component 100 and the stationary component 200 are connected by the second bearing 400. The left side of the rotating component 100 is the liquid supply chamber 410, and the right side is the liquid receiving chamber 420. In this case, it is also necessary to prevent liquid from leaking from the location of the second bearing 400. Therefore, a sealing device is provided on the left side of the second bearing 400.

[0057] It should be noted that in the above case, since the rotating component 100 is a hollow shaft, the sealing of the inner side of the first ring body 1 does not need to be considered. Additionally, in Figure 3 In the illustrated embodiment, although the example is taken as the end of the rotating component 100 engaging with the outer surface of the cylinder 16, it does not constitute a limitation of this application. In some implementations, the rotating component 100 may also engage with the inner surface of the cylinder 16 or the first ring 1.

[0058] As mentioned above, the sealing device of this application combines multiple sealing methods, using the centrifugal force and labyrinth seal of the first ring 1 as the first sealing method, the line contact seal of the sealing lip 22 in the second ring 2 as the second sealing method, and the magnetohydrodynamic sealing assembly 3 as the last sealing method, which can further improve the sealing effect.

[0059] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A seal device installed between a rotating member (100) and a stationary member (200) for sealing a fluid, characterized by, The sealing device comprises: A first ring body (1) for being fixed to the outer surface of the rotating part (100) and rotating synchronously with the rotating part (100), the first ring body (1) comprising a first surface (11) and a second surface (12) opposite to the first surface (11), the first surface (11) facing the side where fluid is located; Wherein, a plurality of annular grooves (121) or annular protrusions are arranged on the second surface (12), and the plurality of annular grooves (121) or annular protrusions are arranged along the radial direction of the first ring body (1), so that the second surface (12) and the end surface of the stationary part (200) form a labyrinth seal through the annular grooves (121) or the annular protrusions in the state of abutting against each other.

2. The sealing device of claim 1, wherein The edge of the first surface (11) away from the axis of the first ring body (1) is provided with a stop portion (13), and the stop portion (13) is arranged along the circumferential direction of the first ring body (1).

3. The sealing device of claim 2, wherein, The stop portion (13) has a flow guide surface (131), and the flow guide surface (131) is smoothly connected with the first surface (11), so that the fluid close to the first surface (11) can flow along the flow guide surface (131) in the direction away from the second surface (12) under the action of centrifugal force.

4. The sealing device of claim 1, wherein The surface of the first ring body (1) abutting against the rotating part (100) is provided with a groove (14) along the circumferential direction, and a sealing ring (15) is arranged in the groove (14).

5. The sealing device according to any one of claims 1 to 4, characterized in that The sealing device further comprises: A second ring body (2) arranged close to the second surface (12), the second ring body (2) comprising a main body portion (21) and a sealing lip (22) connected to the main body portion (21); The main body portion (21) is fixed to the rotating part (100), and the sealing lip (22) abuts against the stationary part (200); or The main body portion (21) is fixed to the stationary part (200), and the sealing lip (22) abuts against the rotating part (100).

6. The sealing device of claim 5, wherein The first ring body (1) is provided with a cylinder body (16) extending from the second surface (12) in the direction away from the first surface (11); The main body portion (21) is fixedly arranged on the outer surface of the cylinder body (16), and the sealing lip (22) abuts against the stationary part (200).

7. The sealing device of claim 6, wherein The extension direction of the sealing lip (22) is arranged at an angle with the radial direction of the first ring body (1), and the sealing lip (22) is inclined toward the second surface (12), and a recess (23) is formed between the sealing lip (22) and the main body portion (21).

8. The sealing device of claim 7, wherein The sealing device further comprises: A support ring (4) sleeved on the cylinder body (16), and the support ring (4) is located between the second surface (12) and the sealing lip (22), and the support ring (4) abuts against the second surface (12) and the sealing lip (22) respectively.

9. The sealing device of claim 7, wherein, The sealing device further comprises a retainer ring (24) which is in contact with the end surface of the cylinder (16) away from the second surface (12) to axially position the second ring (2).

10. The sealed device of claim 5, wherein, The sealing device further comprises a magnetic fluid sealing assembly (3) which is located on the side of the first ring (1) away from the fluid, and the second ring (2) is located between the second surface (12) and the magnetic fluid sealing assembly (3), and the magnetic fluid sealing assembly (3) comprises: a permanent magnet (31); a magnetic conducting ring (32) arranged on both sides of the permanent magnet (31) respectively; a magnetic fluid (33) arranged between the magnetic conducting ring (32) and the outer surface of the rotating part (100).

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