sealing member

Abstract

In addition to having a good sealing and shielding effect, this invention provides a non-contact sealing member that does not involve wear, does not generate heat, and does not affect power consumption. [Solution] A sealing member comprising a fixed unit 3 and a rotating unit 4 whose position is restricted within the fixed unit, wherein the fixed unit includes a stationary ring 31 fixed to an external mechanism and an outer seal ring 32 fitted onto the stationary ring. The rotating unit is fitted onto the rotating shaft of the external mechanism and rotates together with the rotating shaft, and does not come into contact with the fixed unit when the rotating unit rotates. The rotating unit includes a rotating ring 41 and at least one inner seal ring 42 provided on the inner ring side of the rotating ring and in contact with the rotating shaft. A plurality of convex barrier portions 411 are formed on the outer ring side of the rotating ring, and the barrier portions extend toward the stationary ring along the diametrical direction of the rotating shaft.

Description

Technical Field

[0001] This invention belongs to sealing members, and particularly relates to non-contact sealing members.

Background Art

[0002] In cleaning or disinfection devices, they often come into contact with moisture, acidic and basic substances. If these substances penetrate into the device, it may affect the normal operation of the device.

[0003] As shown in FIG. 1, in a conventional device, usually, a sealing material 1 is installed inside the device and fitted onto a rotating shaft 10. The lip structure 11 of the sealing material 1 contacts the rotating shaft 10 to prevent the intrusion of liquid and external contaminants. However, when the rotating shaft 10 rotates, the sealing material 1 does not rotate. Therefore, the lip structure 11 of the sealing material 1 continuously contacts the rotating shaft 10. When used for a long time, the lip structure 11 wears out, further affecting the sealing function.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The main object of this invention is to provide a non-contact sealing member.

[0005] The beneficial effect of this invention is that when the rotating unit rotates, due to the non-contact design where it does not contact the fixed unit, in addition to having a good sealing and shielding effect, the fixed unit and the rotating unit do not rub against each other, so there is no wear debris, no heat generation, and it does not affect the power consumption.

Brief Description of the Drawings

[0006] [Figure 1] It is a schematic diagram explaining the form in which a conventional sealing material is attached to a rotating shaft. [Figure 2] It is a schematic cross-sectional view of a partial preferred embodiment of the sealing member according to this invention. [Figure 3]This is a schematic diagram illustrating a preferred embodiment in which the object is mounted on a rotating shaft. [Figure 4] This is a partial enlargement view of the enlarged aspect indicated by the frame in Figure 3. [Modes for carrying out the invention]

[0007] Referring to Figure 2, a preferred embodiment of the sealing member 2 according to the present invention includes a fixed unit 3 and a rotating unit 4 whose position is restricted within the fixed unit 3. As shown in Figure 3, the sealing member 2 is attached to the rotating shaft 10 of an external mechanism. The external mechanism may, but is not limited to, a cleaning device. Referring to Figures 2 and 4, the fixed unit 3 includes a stationary ring 31 for locking to the external mechanism and an outer seal ring 32 fitted onto the stationary ring 31. The rotating unit 4 is fitted onto the rotating shaft 10 of the external mechanism, rotates with the rotating shaft 10, and does not come into contact with the fixed unit 3 when the rotating unit 4 rotates. The rotating unit 4 includes a rotating ring 41 and at least one inner seal ring 42 provided on the inner ring side of the rotating ring 41 and in contact with the rotating shaft 10. Multiple convex barrier portions 411 are formed on the outer ring side of the rotating ring 41, and the barrier portions 411 extend toward the stationary ring 31 along the diametrical direction of the rotating shaft 10. The non-contact design, which prevents the rotating unit 4 from coming into contact with the stationary unit 3 when it rotates, provides a good sealing and shielding effect. Furthermore, because the stationary unit 3 and the rotating unit 4 do not rub against each other, there is no wear material, no heat generation, and no impact on power consumption.

[0008] More specifically, the stationary ring 31 has an inner stop portion 311 that is locked to the external mechanism, a surrounding portion 312 connected to the inner stop portion 311 and surrounding the rotating ring 41, an outer stop portion 313 connected to the surrounding portion 312, and a flange portion 314 provided on the surrounding portion 312 and located between the inner stop portion 311 and the outer stop portion 313. Here, the flange portion 314, together with the outer stop portion 313, restricts the rotating ring 41. Of particular note, as shown in Figure 4, the maximum distance H1 of the inner diameter of the flange portion 314 of the stationary ring 31 is smaller than the maximum distance H2 of the outer diameter of any barrier portion 411 of the rotating ring 41. Therefore, after the rotating ring 41 is installed inside the stationary ring 31 using a special jig, the rotating ring 41 is positioned between the flange portion 314 and the outer stop portion 313, and will not come off due to the stationary ring 31 falling out, thanks to the size design described above.

[0009] In this preferred embodiment, the number of inner seal rings 42 of the rotating unit 4 is multiple and they are spaced apart. As shown in Figures 2 to 4, the number of inner seal rings 42 is two, i.e., a double inner seal ring design. This provides a better sealing effect and also achieves a dynamic balancing effect, preventing the rotating ring 41 from being displaced relative to the rotating shaft 10 during long periods of operation.

[0010] Furthermore, the surrounding portion 312 of the stationary ring 31 has an inclined surface 315 toward the rotating ring 41, and the outer diameter of the barrier portion 411 of the rotating ring 41 varies depending on the distance from the inclined surface 315. More specifically, as shown in Figure 4, in accordance with the angle of the inclined surface 315, the outer diameter of the barrier portion 411a is larger than the outer diameter of the barrier portion 411b in order to maintain the distance between the stationary ring 31 and the rotating ring 41, so that the gap between the stationary ring 31 and the rotating ring 41 due to the formation of the inclined surface 315 does not increase and affect the shielding effect. As shown in Figure 2, the stationary ring 31 further includes a discharge hole 316, and if leaking liquid inadvertently enters the sealing member 2, the inclined surface 315 guides the leaking liquid to avoid accumulation, allowing the leaking liquid to be quickly discharged through the discharge hole 316. Note that when the sealing member 2 of this invention is attached to a horizontal device, the discharge hole 316 is located at the 6 o'clock position (i.e., directly below) of the device.

[0011] The sealing member 2 of this disclosure, through the above-described structural design, provides the following effects:

[0012] Non-contact design: The stationary ring 31 is fixed to the external structure, and the rotating ring 41 is fitted onto the rotating shaft 10. When the rotating shaft 10 rotates, the rotating ring 41 rotates in conjunction with the rotation of the rotating shaft 10, but the stationary ring 31 does not move, and does not come into contact with the rotating ring 41 during the normal rotation process. Due to the non-contact design described above, the stationary ring 31 and the rotating ring 41 do not rub against each other, resulting in no wear material, no heat generation, and no impact on power consumption (low torque value). It should be particularly noted that the rotating ring 41 further has an outer surface 412 facing the outer stop portion 313 of the stationary ring 31, and an annular protrusion 413 provided on the outer surface 412. If the rotating shaft 10 or the rotating ring 41 becomes misaligned and the rotating ring 41 comes into contact with the outer stop portion 313 of the stationary ring 31 during rotation, the contact point will be limited to the annular protrusion 413, significantly reducing the area over which the rotating ring 41 inadvertently contacts the stationary ring 31.

[0013] A multi-stage path provides a good shielding effect: The protruding barrier portion 411 is formed on the outer ring side of the rotating ring 41, and the barrier portion 411 extends along the diametrical direction of the rotating shaft 10 toward the stationary ring 31. Each barrier portion 411 provides a shielding effect, and in this preferred embodiment, by forming four barrier portions 411, four shielding paths are generated, achieving a good shielding effect and preventing the intrusion of external liquids.

[0014] Rapid drainage: The design of the inclined surface 315 and discharge hole 316 of the stationary ring 31 allows external leaking liquid to enter the stationary ring 31, guiding the leaking liquid through the inclined surface 315 to prevent its accumulation, while allowing the leaking liquid to be rapidly discharged through the discharge hole 316.

[0015] Improving the dynamic balancing effect: In this preferred embodiment, the rotating ring 41 is combined with two inner seal rings 42, i.e., a double inner seal ring 42 design, which not only provides a better sealing effect but also achieves a dynamic balancing effect, preventing the rotating ring 41 from being displaced relative to the rotating shaft 10 during long periods of operation.

[0016] Convenient to install: Since the stationary ring 31 and the rotating ring 41 are assembled in advance to form an integrated design, the number of steps required to attach them to the rotating shaft 10 is reduced, improving the convenience of installation.

[0017] As can be seen from the above description, the sealing member 2 of this disclosure has a non-contact design that prevents it from coming into contact with the stationary unit 3 when the rotating unit 4 rotates, and in addition, because the stationary unit 3 and the rotating unit 4 do not rub against each other, there is no wear material, no heat generation, and it does not affect the power consumption. At the same time, it provides multiple blocking paths through multiple barrier portions 411, and the design of the inclined surface 315 and the discharge hole 316 allows for rapid discharge of liquid, and the double inner seal ring 42 design improves the dynamic balance effect. [Explanation of symbols]

[0018] 1. Sealing material 10. Rotating shaft 11. Lip structure 2. Sealing member 3. Fixing unit 31. Stationary ring 311. Inner stop portion 312. Surrounding portion 313. Outer stop portion 314. Flange portion 315. Inclined surface 316. Discharge hole 32. Outer seal ring 4. Rotating unit 4,1. Rotating ring 411. Barrier portion 411a. Barrier portion 411b. Barrier portion 412. Outer surface 413. Annular convex portion 42. Inner seal ring H1. Distance H2. Distance

Claims

1. A sealing member including a fixed unit and a rotating unit, The aforementioned fixing unit includes a retaining ring for locking to an external mechanism and an outer seal ring fitted onto the retaining ring. The rotating unit is positioned within the stationary unit and fitted onto the rotating shaft of the external mechanism, rotates together with the rotating shaft, and does not come into contact with the stationary unit when the rotating unit rotates, wherein the rotating unit includes a rotating ring and at least one inner seal ring provided on the inner ring side of the rotating ring and in contact with the rotating shaft, and a plurality of convex barrier portions are formed on the outer ring side of the rotating ring, the barrier portions extending in the direction of the stationary ring along the diametrical direction of the rotating shaft, the sealing member.

2. The sealing member according to claim 1, wherein the stationary ring has an inner stop portion that is locked and fixed to the external mechanism, a surrounding portion connected to the inner stop portion and surrounding the rotating ring, an outer stop portion connected to the surrounding portion, and a flange portion provided on the surrounding portion and located between the inner stop portion and the outer stop portion, the flange portion, together with the outer stop portion, restricts the rotating ring.

3. The sealing member according to claim 2, wherein the maximum distance of the inner diameter of the flange portion of the stationary ring is smaller than the maximum distance of the outer diameter of any barrier portion of the rotating ring.

4. The sealing member according to claim 3, wherein the rotating ring further has an outer surface facing the outer stop portion of the stationary ring and an annular projection provided on the outer surface.

5. The sealing member according to claim 2, wherein the surrounding portion of the stationary ring has an inclined surface toward the rotating ring, and the outer diameter of the barrier portion of the rotating ring varies depending on the distance from the inclined surface.

6. The sealing member according to claim 1, wherein the stationary ring further includes a discharge hole.

7. The sealing member according to claim 1, wherein the number of inner sealing rings of the rotating unit is multiple and they are provided at intervals.

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