CN213871112U - Sealing device and apparatus having a rotating shaft - Google Patents

Abstract

The utility model discloses a sealing device and equipment that has the rotation axis. A sealing device for use with a rotary shaft seal, a body of the rotary shaft seal being configured to pass through a rotary shaft and including a sealing portion in dynamic sealing engagement with the rotary shaft, the sealing device comprising: an annular body configured to pass through the rotating shaft, the annular body including opposing first and second annular portions. The first annular portion defines a static sealing surface for forming a static sealing engagement with the rotating shaft and the second annular portion defines a dynamic sealing surface for forming a dynamic sealing engagement with a portion of the body of the rotating shaft seal adjacent the sealing portion. The utility model provides a sealing device can prevent the wearing and tearing of outside pollutant to rotary shaft seal and rotation axis effectively, prolongs the life of rotary shaft seal and rotation axis, easily integrates to have on rotation axis and the rotation axis have the equipment of movive seal.

Description

Sealing device and apparatus having a rotating shaft

Technical Field

The present invention relates to an apparatus for effecting a seal with respect to a device having a rotating shaft, and more particularly, to a sealing apparatus for use with a rotating shaft seal and a device having a rotating shaft.

Background

Rotary shaft seals are seals that can prevent leakage of a fluid (e.g., lubricating oil) under pressure to the outside, and are widely used in devices (e.g., gas turbines, steam turbines, water turbines, pumps, home appliances, engines, motorcycles, etc.) that have rotating shafts and require sealing with oil, gas, water, etc. However, when the rotary shaft seal is mounted on the rotary shaft, the interface of the rotary shaft and the rotary shaft seal (e.g., near the seal lip) may allow external contaminants (e.g., dust, other impurities, etc.) to enter during rotation of the rotary shaft, which can increase wear of the rotary shaft and the rotary shaft seal, thereby causing the rotary shaft seal to fail.

In the prior art, a possible solution is to use mechanical seals, which have the disadvantage that they require the manufacturer to send specialized personnel to replace and repair when they are worn, making installation and maintenance cumbersome and costly. Another possible solution is to use a plurality (e.g. two, three, etc.) of rotary shaft seals, which has the disadvantages of complex structure, high cost, and not being able to effectively prevent the entry of external contaminants, only being able to delay the entry of external contaminants to a limited extent, since the delay in time does not multiply with the increase in the number of rotary shaft seals.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a provide a sealing device that is used for using together with rotatory bearing seal and has the equipment of rotation axis solve present rotatory bearing seal because of outside pollutant gets into rotation axis and rotatory bearing seal laminating department and lead to the problem of the too early wearing and tearing inefficacy of rotatory bearing seal.

An aspect of the present invention provides a sealing arrangement for use with a rotary shaft seal, the body of the rotary shaft seal being configured to pass through a rotary shaft and including a seal portion forming a dynamic seal fit with the rotary shaft, the sealing arrangement comprising: an annular body configured to pass through the rotating shaft, the annular body including opposing first and second annular portions, wherein the first annular portion defines a static sealing face to form a static sealing engagement with the rotating shaft and the second annular portion defines a dynamic sealing face to form a dynamic sealing engagement with a portion of the body of the rotary shaft seal adjacent the sealing portion.

Further in accordance with the foregoing aspect, the sealing device as outlined above may also include one or more of the following preferred forms.

In some preferred forms, the annular body further comprises: a transition connecting the first annular portion and the second annular portion, the transition defining a recessed surface.

In some preferred forms, the second annular portion further defines a connection face disposed between the dynamic sealing face and the recessed face.

In some preferred forms, the connection face is configured to form a clearance fit with the rotary shaft.

In some preferred forms, the annular body further comprises: and the flanging structure extends outwards from the outer side of the dynamic sealing surface, so that the flanging structure extends towards the rotary shaft seal side when the dynamic sealing surface is matched with the body of the rotary shaft seal in a dynamic sealing manner.

In some preferred forms, the second annular portion is of a flexible material.

In some preferred forms, the sealing device and the rotary shaft seal comprise a seal assembly.

Another aspect of the present invention provides an apparatus having a rotation shaft, the apparatus including: a rotary shaft seal having a body configured to pass through a rotary shaft and including a sealing portion in dynamic sealing engagement with the rotary shaft; and a sealing device according to the preceding aspect.

A further aspect of the present invention provides an apparatus having a rotating shaft, the apparatus including: a body of the rotary shaft seal passes through the rotary shaft and comprises a sealing part forming dynamic sealing fit with the rotary shaft; a seal, the seal comprising: an annular body passing through the rotating shaft, wherein the annular body defines a static sealing surface forming a static sealing engagement with the rotating shaft and defines a dynamic sealing surface forming a dynamic sealing engagement with a portion of the body of the rotating shaft seal adjacent the seal portion.

Further in accordance with the foregoing aspect, the apparatus as outlined above may also include one or more of the following preferred forms.

In some preferred forms, the annular body is of a flexible material.

In some preferred forms, the annular body further defines a connecting surface connecting the static seal surface and the dynamic seal surface, wherein the connecting surface has a curved profile.

Compared with the prior art, according to the utility model discloses a seal structure can prevent the wearing and tearing of outside pollutant to rotary shaft seal and rotation axis effectively, prolongs the life of rotary shaft seal and rotation axis effectively, integrates easily to have on rotation axis and the rotation axis has the equipment of movive seal, easily changes and maintains to lower cost has.

Drawings

Embodiments are shown and described with reference to the drawings. These drawings are provided to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference characters designate the same or similar features.

Fig. 1 shows a schematic view of a prior art apparatus including a sealing structure for a rotating shaft.

Fig. 2 shows a close-up view of the sealing structure of the apparatus of fig. 1.

Fig. 3 shows a schematic view of an apparatus comprising a sealing structure for a rotating shaft according to an embodiment of the invention.

Fig. 4 shows a close-up view of the sealing structure of the apparatus of fig. 3.

Fig. 5 shows a schematic view of an apparatus comprising a sealing structure for a rotating shaft according to an embodiment of the invention.

Fig. 6 shows a close-up view of the sealing structure of the apparatus of fig. 5.

Fig. 7 illustrates an exemplary apparatus employing a sealing structure for a rotating shaft according to an embodiment of the present invention.

Detailed Description

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

First, terms referred to in the specification will be described. In this context, a rotary shaft seal, which may also be referred to as a rotary oil seal, is a sealing structure for a rotary shaft that is different from a mechanical seal. The purpose of the rotary shaft seal is: act as a physical barrier, retaining fluids such as lubricating oil in place; the fluid is prevented from leaking to the outside even under a certain pressure (e.g., high pressure).

As previously discussed, when the rotary shaft seal is mounted on the rotary shaft, the interface of the rotary shaft and the rotary shaft seal (e.g., near the seal lip) may allow external contaminants (e.g., dust, other contaminants, etc.) to enter during rotation of the rotary shaft, which can increase wear of the rotary shaft and the rotary shaft seal, thereby causing the rotary shaft seal to fail.

Generally, the prior art employs two or more rotary shaft seals to address the above problems. Fig. 1 shows a schematic view of a related art apparatus 100 including a sealing structure for a rotating shaft, and fig. 2 shows a partially enlarged view 200 of the sealing structure of fig. 1.

Referring to fig. 1, the apparatus 100 includes a rotating shaft 101 and a plurality of rotating shaft seals 102 (two shown). The rotary shaft 101 rotates about an axis, and the rotary shaft seal 102 passes through the rotary shaft 101 and is coaxial with the rotary shaft 101. The plurality of rotary shaft seals 102 constitute a seal structure for the rotary shaft.

Referring to fig. 2, the rotary shaft seal 102 includes a body configured to pass through the rotary shaft 101 and including a sealing portion 201 (e.g., a sealing lip). The sealing portion 201 forms a dynamic seal fit (e.g., an interference dynamic fit) with the rotary shaft 101, i.e., the rotary shaft seal 102 does not rotate synchronously with the rotary shaft 101. The body includes a portion 202 adjacent to the seal 201. Due to dynamic sealing, wear occurs during rotation due to the relative movement of the rotary shaft 101 and the rotary shaft seal 102, and wear occurs between the rotary shaft 101 and the rotary shaft seal 102, particularly the sealing portion 201 thereof. In some cases, for example, with changes in the operating speed of the shaft and changes in the temperature of the working environment, dry friction occurs between the rotary shaft 101 and the rotary shaft seal 102, particularly the seal portion 201 thereof, causing wear. When external contaminants (e.g., dust or other impurities, etc.) enter the portion 202 along a path such as that indicated by curve 206, wear of the rotary shaft 101 and rotary shaft seal 102, and in particular the seal 201 thereof, may be exacerbated, resulting in failure of the rotary shaft seal 102. By arranging a plurality of rotary shaft seals 102 in series that mate with the rotary shaft 101, it is possible to prevent external contaminants from damaging the seal against the rotary shaft 101 with other rotary shaft seals 102 in the event that one rotary shaft seal fails due to external contaminants.

For example, the rotary shaft seal 102 is illustrated as a skeletal oil seal, but not limited thereto, and includes a body constructed of an elastomeric material (e.g., rubber, elastomeric plastic, etc.). The body includes an inner ring 203 and an outer ring 204, the inner ring 203 defining a raised sealing portion 201 (e.g., a sealing lip). The lubricating oil is provided on the sealing portion 201 side, and a stable hydrodynamic oil film is formed between the interface between the sealing portion 201 and the rotating shaft 101 by the boundary lubrication. This oil film usually has a certain pressure and prevents the lubricating oil from flowing outward. The body may also include a spring embedded in inner ring 203 to enhance the self-tightening force of shaft seal 102. The body may also include a metal skeleton embedded in the outer ring 204 and the portion connecting the outer ring 204 and the inner ring 203 of the body, which may be used to increase the mechanical strength of the rotary shaft seal 102 and facilitate positioning of the rotary shaft seal 102 during installation. The body may further include a dust prevention portion 205 (e.g., a dust lip) to prevent dust or foreign substances from entering the sealing portion 201 side from the upper portion. However, the dust-proof portion 205 cannot prevent dust or foreign matter from entering the sealing portion 201 side from the lower portion. When external contaminants (e.g., dust or other impurities, etc.) enter portion 202 adjacent to seal 201 from below along a path, such as indicated by curve 206, wear of rotary shaft 101 and rotary shaft seal 102, and in particular seal 201 thereof, may be exacerbated, resulting in failure of rotary shaft seal 102.

However, the use of any type and any number of multiple rotary shaft seals 102 results in a complex structure, high cost, and ineffective prevention of external contaminants, with only a limited delay in external contaminants, since the delay does not multiply with the number of rotary shaft seals.

To among the prior art rotary shaft seal because of outside pollutant gets into the problem that rotary shaft seal laminating department leads to the premature wear failure of rotary shaft seal, the utility model provides a sealing device, the seal assembly who is used for the rotary shaft that is used for with rotary shaft seal together, the equipment that has the rotary shaft.

Fig. 3 shows a schematic view of an apparatus 300 comprising a sealing structure for a rotating shaft according to an embodiment of the invention. The apparatus 300 includes a rotating shaft 301, at least one rotating shaft seal 302 (one shown), and a sealing device (or seal) 303 for use with the rotating shaft seal 302. The at least one rotary shaft seal 302 and the sealing device 303 constitute a sealing assembly (or sealing structure) for a rotary shaft. The rotary shaft 301 may be similar to the rotary shaft 101 described above with reference to fig. 1 and 2, and the rotary shaft seal 302 may be similar to the rotary shaft seal 102 described above with reference to fig. 1 and 2, and will not be described in detail.

Fig. 4 shows a close-up view 400 of the sealing structure of the apparatus 300 of fig. 3. The sealing device (or seal) 303 comprises an annular body configured to pass through the rotating shaft 301, the annular body comprising opposing first and second annular portions 401, 402. First annular portion 401 defines a static sealing surface 403 to form a static sealing fit (e.g., an interference static fit) with rotating shaft 301, i.e., static sealing surface 403 tightly circumscribes rotating shaft 301 and rotates synchronously with rotating shaft 301 (i.e., sealing device 303 rotates synchronously with rotating shaft 301). The second annular portion 402 defines a dynamic sealing surface 404 for forming a dynamic sealing engagement with a portion (e.g., portion 202) of a body of one rotary shaft seal 302 adjacent to a sealing portion (e.g., sealing portion 201), e.g., the dynamic sealing surface 404 abuts (e.g., is in close proximity to) a surface of the portion of the rotary shaft seal 302. Since the rotary shaft seal 302 does not rotate synchronously with the rotary shaft 301, the sealing device 303 rotates synchronously with the rotary shaft 301, and therefore the rotary shaft seal 302 and the sealing device 303 form a dynamic sealing fit. Because the sealing device 303 is a static seal with the rotating shaft 301, no abrasion is generated, and the sealing device 303 is a dynamic seal with the rotating shaft seal 302, compared with the prior art, the sealing device can effectively prevent the abrasion of external pollutants (for example, entering the vicinity of the sealing part of the rotating shaft seal 302 along the path indicated by the curve 206) to the rotating shaft seal and the rotating shaft, effectively prolong the service life of the rotating shaft seal and the rotating shaft, and the sealing device is easy to integrate to equipment with the rotating shaft and the rotating shaft with the dynamic seal, easy to replace and maintain, and has lower cost.

In an embodiment, the annular body of the sealing device 303 further comprises a transition 405 connecting the first and second annular portions 401, 402, the transition 405 defining a recessed surface 406. By providing the recessed surface 406, deformation-induced spring forces on the dynamic sealing surface 404 when forming a dynamic sealing engagement against the body of the rotary shaft seal 302 can be effectively mitigated (preventing the dynamic sealing surface 404 from being forced too far when contacting the body of the rotary shaft seal 302 when mounting the sealing device 303, for example, in the event that the sealing device 303 is pushed along the axis of the rotary shaft 301 (e.g., by pushing the first annular portion 401) towards the rotary shaft seal 302), thereby preventing the spring forces from causing deformation (e.g., displacement, or deformation of the sealing portion) of the rotary shaft seal 302 that could lead to failure of the rotary shaft seal 302.

In an embodiment, the second annular portion 402 also defines a connection surface 407, the connection surface 407 being disposed between the dynamic sealing surface 404 and the recessed surface 406. In a further embodiment, the connection surface 407 is configured to form a clearance fit with the rotation axis 301. By providing the connection surface 406, it is possible to further relieve the elastic force generated by the deformation of the dynamic sealing surface 404 when contacting the body of the rotary shaft seal 302, and to prevent wear between the annular body and the rotary shaft 301 by the clearance between the connection surface and the rotary shaft 301.

In an embodiment, the annular body of the seal arrangement 303 further includes a bead structure 408 extending outwardly from the outside of the driven sealing surface 404 such that the bead structure 408 extends toward the side of the rotary shaft seal 302 when the driven sealing surface 404 is in dynamic sealing engagement with the body of the rotary shaft seal 302. By providing the flanging configuration 408, external contaminants (e.g., dust or other contaminants, etc.) are prevented from entering the dynamic sealing surface 404 and further from entering the vicinity of the seal portion of the rotary shaft seal 302, thereby preventing wear to the rotary shaft seal and the rotating shaft. In addition, the burring 408 is also effective in preventing fluid (e.g., lubricating oil) disposed on the side of the rotary shaft seal 302 from flowing out. For example, where the rotary shaft seal 302 is a skeleton oil seal, the cuff structure 408 may extend between and toward the portion connecting the inner and outer rings of the rotary shaft seal 302.

In an embodiment, the second annular portion 402 is of a flexible material. For example, the second annular portion 402 or the entire annular body may be of a flexible material. By providing the second annular portion 402 with a flexible material, a flexible seal can be formed between the dynamic seal surface 404 and the body of the rotary shaft seal 302 such that a stable sealing action can be maintained under the influence of mechanical shock and variations in contact surface spring force while preventing dynamic seal induced wear. The flexible material may be, for example, one of rubber, silicone, soft plastic, and rubber may include, but is not limited to, nitrile rubber, acrylate rubber, silicone rubber, fluoro rubber, neoprene, and the like.

According to the sealing device, the sealing assembly and the equipment of the embodiment of fig. 3 and 4, the abrasion of the rotary shaft seal and the rotary shaft by external pollutants can be effectively prevented, the service lives of the rotary shaft seal and the rotary shaft are prolonged, and the sealing structure is easy to install, replace and maintain.

Fig. 5 shows a schematic view of an apparatus 500 comprising a sealing structure for a rotating shaft according to an embodiment of the invention. Apparatus 500 includes a rotating shaft 501, at least one rotating shaft seal 502 (one shown), and a seal 503 for use with rotating shaft seal 502. The at least one rotary shaft seal 502 and seal 503 constitute a seal structure for a rotary shaft. The rotary shaft 501 may be similar to the rotary shaft 101 described above with reference to fig. 1 and 2, and the rotary shaft seal 502 may be similar to the rotary shaft seal 102 described above with reference to fig. 1 and 2, and will not be described in detail.

Fig. 6 shows a close-up view 600 of the sealing structure of the apparatus 500 of fig. 5. The seal 503 comprises an annular body that passes through the rotating shaft 501. The annular body of seal 503 defines a static sealing surface 601 that forms a static sealing engagement with rotating shaft 501 and defines a dynamic sealing surface 602 that forms a dynamic sealing engagement with a portion (e.g., portion 202) of the body of rotating shaft seal 502 adjacent to a seal (e.g., seal 201).

In an embodiment, the annular body of the seal 503 is of a flexible material. By providing an annular body of flexible material, a flexible seal can be formed between the dynamic seal surface 601 and the body of the rotary shaft seal 502 so that a stable sealing action can be maintained under the influence of mechanical shock and variations in contact surface spring force while preventing wear from dynamic seals. The flexible material may be, for example, one of rubber, silicone, soft plastic, and rubber may include, but is not limited to, nitrile rubber, acrylate rubber, silicone rubber, fluoro rubber, neoprene, and the like.

In an embodiment, the annular body of the seal 503 also defines a connecting surface 603 connecting the static sealing surface 601 and the dynamic sealing surface 602, the connecting surface 603 having a curved profile. In one example, the static seal surface 601 and the dynamic seal surface 602 may be co-circularly arcuate such that the connecting surface 603 has a curved profile. In another example, the static seal face 601 and the dynamic seal face 602 may be polygonal in shape such that the connecting face 603 has a curved profile. By providing the connecting surface 603 with a curved profile, the spring force generated by the deformation of the dynamic sealing surface 602 when contacting the body of the rotary shaft seal 502 can be effectively mitigated, thereby preventing the spring force from causing deformation (e.g., displacement, or deformation of the sealing portion) of the rotary shaft seal 502 that could lead to failure of the rotary shaft seal 502.

According to the apparatus of the embodiment of fig. 5 and 6, it is possible to effectively prevent the wear of the rotary shaft seal and the rotary shaft by external contaminants, to extend the service lives of the rotary shaft seal and the rotary shaft, and to easily install, replace, and maintain the sealing structure.

Fig. 7 illustrates an exemplary apparatus 700 employing a sealing structure for a rotating shaft according to an embodiment of the present invention. The exemplary apparatus 700 is a submersible pump that includes a motor shaft 701, a rotary shaft seal 702, a seal 703, an impeller 704 coupled to the motor shaft 701, a pump seal housing 705, a motor charging portion 706 (e.g., stator, rotor, lead, capacitor, etc.), an O-ring 707, and a motor front end cap 708. The rotary shaft seal 702 and the seal 703 constitute a seal structure for the rotary shaft 701. The motor shaft 701 may be any one of the rotating shafts 101, 301, 501 as described above with reference to fig. 1-6, the rotating shaft seal 702 may be any one of the rotating shaft seals 102, 302, 502 as described above with reference to fig. 1-6, and the seal 703 may be any one of the sealing device (or seal) 303 as described above with reference to fig. 3 and 4 or the seal 503 as described above with reference to fig. 5 and 6.

The rotating shaft 701 of the motor, which rotates the submersible pump 700, drives the impeller 704 to rotate, and the impeller 704 rotates to drive water to flow. In the operation of submersible pump 700, the pump is completely submerged, so it is necessary to ensure the sealing of the live part of the motor, as shown in fig. 7, the live part 706 of the motor is sealed between the sealed housing 705 of the pump and the front cover 708 of the motor. The water pump seal housing 705 and the motor front end cover 708 are sealed by an O-ring 707 and a rotary shaft seal 706, wherein the O-ring 707 is used for static sealing, and the rotary shaft seal 706 is used for dynamic sealing. However, dynamic seals wear due to relative motion during rotation of the motor, which may be exacerbated once external contaminants (e.g., dust, other contaminants, etc.) enter the seal faces. Different from the prior art, by adding the sealing member 703 outside the rotary shaft seal 702, the sealing member 703 can cooperate with the motor shaft 701 and the rotary shaft seal 702 according to the foregoing embodiments, thereby effectively blocking external contaminants (e.g., dust, other impurities, etc.) from entering between the motor shaft 701 and the rotary shaft seal 702, effectively preventing the rotary shaft seal 702 from failing, and ensuring the sealing of the charged portion 706 of the motor.

Thus, while the present invention has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the invention, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the invention.

Claims (11)

1. A sealing device for use with a rotary shaft seal, a body of the rotary shaft seal being configured to pass through a rotary shaft and including a sealing portion in dynamic sealing engagement with the rotary shaft, the sealing device comprising:

an annular body configured to pass through the rotating shaft, the annular body including opposing first and second annular portions,

wherein the content of the first and second substances,

the first annular portion defines a static sealing surface for forming a static sealing engagement with the rotating shaft,

the second annular portion defines a dynamic sealing surface for dynamic sealing engagement with a portion of the body of the rotary shaft seal adjacent the sealing portion.

2. The sealing device of claim 1, wherein the annular body further comprises:

a transition connecting the first annular portion and the second annular portion, the transition defining a recessed surface.

3. The sealing arrangement of claim 2, wherein the second annular portion further defines a connection face disposed between the dynamic sealing face and the recessed face.

4. The sealing device of claim 3, wherein the connection face is configured to form a clearance fit with the rotating shaft.

5. The sealing device of claim 1, wherein the annular body further comprises:

and the flanging structure extends outwards from the outer side of the dynamic sealing surface, so that the flanging structure extends towards the rotary shaft seal side when the dynamic sealing surface is matched with the body of the rotary shaft seal in a dynamic sealing manner.

6. The sealing device of claim 1, wherein the second annular portion comprises a flexible material.

7. The sealing device according to any one of claims 1-6, said sealing device and said rotary shaft seal comprising a seal assembly.

8. An apparatus having a rotational axis, the apparatus comprising:

a rotary shaft seal having a body configured to pass through a rotary shaft and including a sealing portion in dynamic sealing engagement with the rotary shaft; and

the sealing device according to any one of claims 1-6.

9. An apparatus having a rotational axis, the apparatus comprising:

a body of the rotary shaft seal passes through the rotary shaft and comprises a sealing part forming dynamic sealing fit with the rotary shaft;

a seal, the seal comprising:

an annular body passing through the rotating shaft,

wherein the annular body defines a static sealing surface forming a static sealing engagement with the rotating shaft and defines a dynamic sealing surface forming a dynamic sealing engagement with a portion of the body of the rotating shaft seal adjacent the sealing portion.

10. The apparatus of claim 9, wherein the annular body is of a flexible material.

11. The apparatus of claim 9, wherein the annular body further defines a connection face connecting the static seal face and the dynamic seal face, wherein the connection face has a curved profile.

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