CN108087556B - Box type sealing structure - Google Patents
Box type sealing structure Download PDFInfo
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- CN108087556B CN108087556B CN201611037372.7A CN201611037372A CN108087556B CN 108087556 B CN108087556 B CN 108087556B CN 201611037372 A CN201611037372 A CN 201611037372A CN 108087556 B CN108087556 B CN 108087556B
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- centrifugal
- lip
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- space
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/322—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction perpendicular to the surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/766—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by pumping action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
- F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
- F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3216—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction parallel to the surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
The invention relates to the field of sealing, in particular to a box type sealing structure. The box-type sealing structure is annular as a whole and comprises: a dust ring; the framework and the dustproof ring form an accommodating space, and the framework is provided with an air inlet communicated with the accommodating space; and at least one centrifugal lip portion which is arranged on the framework and extends out of the framework to be abutted against the dustproof ring. When the first member and the second member are relatively rotated, the air flow flowing into the accommodating space from the air intake hole of the frame can separate the at least one centrifugal lip from the dust-proof ring by a predetermined interval and the air flow can flow out of the cassette seal structure from the interval. Thus, the present invention provides a cartridge type seal structure capable of providing a good static seal and dynamic seal for a rotating assembly by the seal of the seal lip and the air seal.
Description
Technical Field
The present invention relates to the field of seals, and more particularly to a cartridge seal arrangement for sealing between relatively rotatable members.
Background
The main shaft and the bearing of the current glass machine often work in a harsh environment and are surrounded by water vapor, mist and glass powder, so that the protection of the main shaft and the bearing is very important. In the prior art, bearings are installed in the chamber of the glass machine and the spindle and bearings are sealed using labyrinth seals and air seals. When the glass machine is operated, external air continuously enters the bearing-mounted chamber through a specific passage and blows out water vapor, mist and glass powder accumulated outside the main shaft and the bearing by a stable air pressure. In addition, the labyrinth seal having a complicated structure can prevent contaminants from entering the chamber, so that external contaminants can be effectively kept away from the chamber by the labyrinth seal and the air seal.
However, in the above-described solution, it is difficult for the labyrinth seal to protect the main shaft and the bearing by its own structure in the case where the air seal does not work. In case the input air pressure is unstable or weak (even zero), water vapor, mist and glass powder will easily enter the chamber, so that the sealing effect is greatly reduced.
Disclosure of Invention
The present invention has been made in view of the above-mentioned drawbacks of the prior art. The invention aims to provide a box type sealing structure which can solve the problem that the sealing effect of the sealing structure comprising a labyrinth seal and an air seal in the prior art is reduced under the condition that the air seal is not functional.
In order to achieve the above object, the present invention adopts the following technical means.
The invention provides a box type sealing structure which is used for sealing a first member and a second member which can rotate relatively, the box type sealing structure is annular as a whole, and the box type sealing structure comprises: a dust ring for securing to the first member; the framework is used for being fixed on the second component, an accommodating space is formed between the framework and the dustproof ring, and an air inlet communicated with the accommodating space is formed in the framework; and at least one centrifugal lip provided to and extending from the skeleton to abut the dust collar, and arranged to: when the first member and the second member are relatively rotated, the air flow flowing into the accommodating space from the air intake hole of the skeleton can separate the at least one centrifugal lip from the dust-proof ring by a predetermined interval and the air flow can flow out of the cassette seal structure from the interval.
Preferably, the skeleton includes be used for with the outer skeleton that the second component is fixed and with the inner frame that the outer skeleton is fixed, the outer skeleton is formed with the inlet port, and the inner frame has along the radial part of radially extending inner frame, the radial part of inner frame will accommodation space divides into first space and the second space that communicates each other, first space with the inlet port intercommunication of outer skeleton, the second space with the outside intercommunication of box seal structure, at least one centrifugal lip set up in the radial part of inner frame and in the second space follow the radial part of inner frame extend with the dirt proof ring butt.
More preferably, the dust collar has a radially extending dust collar radial portion, the at least one centrifugal lip abuts the dust collar radial portion, and the dust collar radial portion is provided with a plurality of centrifugal grooves extending substantially in the circumferential direction at a portion of the dust collar radial portion abutting the at least one centrifugal lip.
More preferably, the plurality of centrifugal grooves include a first centrifugal groove having one circumferential end located radially outside the other circumferential end thereof, and a width of at least a portion of the first centrifugal groove including the one circumferential end is gradually reduced toward the one circumferential end.
More preferably, the plurality of centrifugal grooves further include a second centrifugal groove whose other circumferential end is located radially outside one circumferential end of the second centrifugal groove, and a width of at least a part of the second centrifugal groove including the other circumferential end is gradually reduced toward the other circumferential end.
Preferably, the cassette seal structure further comprises a secondary lip provided to and extending from the skeleton for abutment with the first member, and the secondary lip is provided to: when the first member and the second member are relatively rotated, the secondary lip portion can be separated from the first member by a predetermined interval by an air flow flowing into the accommodating space from the air intake hole of the frame.
More preferably, the secondary lip is provided, at a site of the secondary lip for abutment with the first member, with a plurality of pump oil grooves extending in the axial direction and/or extending obliquely with respect to the axial direction, the pump oil grooves opening at an axially inner end edge of the secondary lip, the pump oil grooves not opening at an axially outer end edge of the secondary lip.
More preferably, the secondary lip is provided with a plurality of semi-annular grooves at a portion of the secondary lip for abutment with the first member, both ends of the semi-annular grooves being open at an axially inner end edge of the secondary lip, the semi-annular grooves not being open at an axially outer end edge of the secondary lip.
Preferably, the frame is provided with a recess along a circumferential entire circumference at a portion of the frame where the air intake hole is formed, for forming an additional air accommodating space between the frame and the second member.
The cartridge type seal assembly adopting the above-described specific structure can be used for sealing of a rotating assembly as follows: the rotating assembly includes first and second members that are relatively rotatable and a cassette seal structure may be provided between the first and second members to seal a gap between the first and second members. The rotating assembly can be a shaft assembly or a bearing and the like. Where the rotating assembly is a shaft assembly, the first member may be a shaft and the second member may be a housing; where the rotating assembly is a bearing, the first member may be an inner race and the second member may be an outer race.
By adopting the technical scheme, the invention provides the box type sealing structure which can provide good static sealing and dynamic sealing for the rotating assembly through the sealing of the sealing lip and the air sealing, and can also achieve good sealing effect even if the sealing lip is sealed under the condition that the air sealing does not work. In addition, the sealing lip of the box type sealing structure is not contacted with the dustproof ring or the rotating assembly when the rotating assembly works, so that the box type sealing structure is not easy to abrade, and the service life is prolonged.
Drawings
FIG. 1a is a partially cut-away perspective view of a shaft assembly with a cartridge seal arrangement according to a first embodiment of the present invention installed; FIG. 1b is a schematic diagram showing a cross-section of the shaft assembly of FIG. 1 a; fig. 1c is a partially enlarged schematic view of the upper portion of fig. 1 b.
Fig. 2 is a schematic perspective view of an exoskeleton of the cassette seal arrangement of fig. 1 a.
Fig. 3 is a schematic front view of a dust ring of the cartridge seal structure of fig. 1 a.
Figure 4 is a schematic perspective view of a secondary lip of the cassette seal arrangement of figure 1 a.
Fig. 5 is a partially enlarged schematic view of an upper side portion of the shaft assembly mounted with the cartridge type seal structure according to the second embodiment of the present invention.
Fig. 6 is a schematic perspective view of an exoskeleton of the cassette seal arrangement of fig. 5.
Fig. 7 is a front view schematically showing a dust-proof ring of the cassette seal structure in fig. 5.
Fig. 8 is a schematic perspective view of a secondary lip of the cartridge seal arrangement of fig. 5.
Fig. 9 is a partially enlarged schematic view of an upper side portion of the shaft assembly mounted with the cartridge type seal structure according to the third embodiment of the present invention.
Fig. 10 is a front view schematically showing a dust-proof ring of the cassette seal structure in fig. 9.
Fig. 11 is a schematic perspective view of a secondary lip of the cartridge seal arrangement of fig. 9.
Description of the reference numerals
1-shaft 2 outer shell 21 first air inlet 3 box type sealing structure 31 outer frame axial part 312 outer frame radial part 313 second air inlet 32 inner frame 321 inner frame axial part 322 inner frame radial part 33 dust proof ring 331 dust proof ring axial part 332 dust proof ring radial part 333 first centrifugal groove 334 second centrifugal groove 34 centrifugal lip part 351 auxiliary lip axial part 352 auxiliary lip part 353 centrifugal lip part 35 centrifugal lip part 352 auxiliary lip part 353 oil pumping groove
Air accommodating space added to first space S2 and second space S3 in A-axis direction R-radial direction C-circumferential direction S1
Detailed Description
The following description will explain embodiments of the present invention by referring to the drawings attached hereto. In the drawings, the "axial direction" denoted by reference character a is the axial direction of the shaft assembly (cartridge seal structure); the "radial direction" denoted by the reference R is the radial direction of the shaft assembly (cartridge seal structure); the "circumferential direction" denoted by the reference character C is the circumferential direction of the shaft assembly (cartridge seal structure). Unless otherwise stated, the axially inner side refers to the left side in fig. 1b, 1c, 5 and 9, and the axially outer side refers to the right side in fig. 1b, 1c, 5 and 9. A lubricating medium such as grease or the like exists axially inside the cartridge seal structure, and contaminants such as dust, steam or the like exist axially outside the cartridge seal structure.
The cassette seal structure according to the present invention can be used for sealing of a rotary assembly including two members capable of relative rotation. The following describes a specific embodiment of the present invention with a shaft assembly as a sealing object of the cartridge seal structure according to the present invention. As described above, the shaft assembly is one example of a rotating assembly and includes a shaft and a housing that are relatively rotatable and located at a radially outer position of the shaft, wherein the shaft is a first member of the rotating assembly and the housing is a second member of the rotating assembly.
(first embodiment)
As shown in fig. 1a to 1c, a cassette seal structure 3 according to a first embodiment of the present invention is mounted to a shaft 1 and a housing 2 which are relatively rotatable and the cassette seal structure 3 is annular as a whole. In the present embodiment, the box-type seal structure 3 includes a skeleton (an outer skeleton 31 and an inner skeleton 32), a dust ring 33, an eccentric lip 34, and a sub-lip 35, wherein a space surrounded by the skeleton (the outer skeleton 31) and the dust ring 33 is a housing space.
In the present embodiment, the skeleton includes an outer skeleton 31 and an inner skeleton 32 fixed to each other.
The outer frame 31 has an outer frame axial portion 311 extending in the axial direction a and an outer frame radial portion 312 extending radially inward in the radial direction R from an axially inner end of the outer frame axial portion 311. The outer frame axial portion 311 is fixed to the housing 2 of the shaft assembly, and the outer frame axial portion 311 is provided with a second air intake hole 313 (shown in fig. 2) as a radial through hole. When the outer frame axial portion 311 is fixed to the housing 2, the second air intake holes 313 communicate with the first air intake holes 21 provided in the housing 2 correspondingly and form an air intake passage that communicates with the accommodation space to enable the inflow of outside air into the accommodation space. The secondary lip 35 is disposed at a radially inner end of the exoskeleton radial portion 312.
The inner frame 32 has an inner frame axial portion 321 extending in the axial direction a and an inner frame radial portion 322 extending radially inward in the radial direction R from an axially inner end of the inner frame axial portion 321. The inner frame axial portion 321 is fixed to the outer frame axial portion 311 in such a manner as not to interfere with communication between the intake passage and the accommodation space. The inner frame radial portion 322 extends within the housing space and divides the housing space into a first space S1 and a second space S2 which are side by side in the axial direction a and communicate with each other, the intake passage directly communicates with the first space S1, and the second space S2 communicates with the axially outer side of the cassette seal structure 3. The eccentric lip 34 is disposed in the inner cage radial portion 322.
In the present embodiment, the dust ring 33 has a dust ring axial portion 331 extending in the axial direction a and a dust ring radial portion 332 extending radially outward in the radial direction R from an axial outer end of the dust ring axial portion 331. The dust collar axial portion 331 is fixed to the shaft 1 of the shaft assembly. The dust collar radial portion 332 abuts the centrifugal lip 34, and a plurality of first centrifugal grooves 333 (shown in fig. 3) are provided in the dust collar radial portion 332, and a specific manner of providing the first centrifugal grooves 333 will be described below.
In this embodiment, two eccentric lips 34 spaced apart from each other are provided on the inner frame radial portion 322. Both the centrifugal lips 34 are disposed in the second space S2, and each centrifugal lip 34 extends radially outward from the inner frame radial portion 322 obliquely with respect to the axial direction a. Each of the eccentric lips 34 is thin and elastic, so that an axially outer portion of each of the eccentric lips 34 abuts against the dust collar radial portion 332. In this way, when the dust ring 33 (shaft 1) is not rotated, the axially outer portion of the centrifugal lip 34 can be pressed against the dust ring radial portion 332 and cover the plurality of first centrifugal grooves 333 by the elastic force of the centrifugal lip 34 itself, thereby producing a good static seal against contaminants axially outer side of the cassette seal structure 3.
In the present embodiment, the sub lip 35 is provided at the radially inner end of the outer frame radial portion 312 and extends to the shaft 1, so that the sub lip 35 can be pressed against the shaft 1 by the elastic force of the sub lip 35 itself when the shaft 1 is not rotated, thereby producing a good static seal against the lubricating medium on the axially inner side of the cassette seal structure 3. At the portion where the sub lip 35 abuts the shaft 1, the sub lip 35 is provided with a plurality of pump oil grooves 353 (shown in fig. 4) for pumping the lubricating medium to the inside in the axial direction, and a specific arrangement manner of the pump oil grooves 353 will be described below.
The manner of arranging the first centrifugal groove 333 provided in the dust ring radial portion 332 and the manner of arranging the pump oil groove 353 provided in the sub lip 35 will be described below with reference to fig. 3 and 4, respectively.
As shown in fig. 3, in the present embodiment, the dust-proof ring radial portion 332 is provided with a plurality of first centrifugal grooves 333 extending substantially in the circumferential direction C at a portion of the dust-proof ring radial portion 332 to be abutted against the centrifugal lip 34 (an axially inner side surface of the dust-proof ring radial portion 332), so that smooth flow of the air flow in the first centrifugal grooves 333 can be ensured during rotation of the dust-proof ring 33 together with the shaft 1.
In the present embodiment, one circumferential end of each first centrifugal groove 333 is located radially outward of the other circumferential end of the first centrifugal groove 333, so that when the dust-proof ring 33 rotates, the air flow flows in from the other circumferential end of each first centrifugal groove 333 and flows out from the one circumferential end of the first centrifugal groove 333, and thus the contaminants collected at the first centrifugal groove 333 can be discharged radially outward.
In the present embodiment, the width (dimension in the radial direction R) of the first centrifugal grooves 333 undergoes a process of gradually increasing and then gradually decreasing in the process of extending from the other end in the circumferential direction to the one end in the circumferential direction, which enables the flow velocity of the gas flow in the first centrifugal grooves 333 to be faster.
In the present embodiment, the first centrifugal groove 333 is shaped as an arc-shaped groove (may also be referred to as a parabolic groove). Further, a plurality of (two in the present embodiment) turns of the first centrifugal groove 333 are provided corresponding to the plurality of (two in the present embodiment) centrifugal lips 34. The plurality of first centrifugal grooves 333 in one turn provided corresponding to one centrifugal lip 34 are arranged in the entire circumference in the circumferential direction C, and adjacent two first centrifugal grooves 333 may partially overlap in the radial direction R, so that a greater number of first centrifugal grooves 333 can be provided in one turn.
As shown in fig. 4, in the present embodiment, the sub-lip 35 has a sub-lip radial portion 352 extending in the radial direction R and a sub-lip axial portion 351 extending substantially in the axial direction a from a radially inner end of the sub-lip radial portion 352. The minor lip radial portion 352 is disposed at a radially inner end of the exoskeleton radial portion 312. The sub-lip axial portion 351 is for abutting against the shaft 1. At a portion of the sub-lip axial portion 351 for abutting against the shaft 1 (i.e., a radially inner side surface of the sub-lip axial portion 351), the sub-lip axial portion 351 is provided with a plurality of pump oil grooves 353 extending obliquely with respect to the axial direction a. In the present embodiment, the plurality of pump oil grooves 353 are uniformly arranged along the circumferential direction C over the entire circumference, and adjacent two pump oil grooves 353 are spaced apart from each other.
In the present embodiment, the axial inner end of the pump oil groove 353 is open at the axial inner end edge of the sub lip 35, but the axial outer end of the pump oil groove 353 is terminated inside the sub lip 35 (i.e., the axial outer end of the pump oil groove 353 is not open at the axial outer end edge of the sub lip 35). In this way, the lubricating medium on the axially inner side of the cassette seal structure 3 can be made not to easily flow into the housing space of the cassette seal structure 3 even after entering through the axially inner end of the pump oil groove 353.
The first centrifugal groove 333 and the pump oil groove 353 provided in the present embodiment are both applied to the case where the shaft 1 rotates in one direction. In addition, the rotational direction of the shaft 1 should be ensured in such a way that contaminants can be finally discharged to the axially outer side of the cassette seal via the first centrifugal groove 333, and that the pump oil groove 353 can pump the lubricating medium to the axially inner side of the cassette seal.
The operation principle and the effects of the cartridge seal structure 3 according to the present embodiment will be described below.
(1) Static seal
When the dust ring 33 and the shaft 1 are not rotating (i.e. the shaft 1 and the housing 2 are not rotating relative to each other), no air flow enters the housing space of the cassette seal 3, the centrifugal lip 34 presses against the dust ring radial portion 332 to achieve a good static seal against contaminants on the outside of the shaft, and the secondary lip 35 presses against the shaft 1 to achieve a good static seal against the lubricating medium on the inside of the shaft.
(2) Dynamic sealing and pumping effect
When the dust ring 33 rotates together with the shaft 1 (i.e., the shaft 1 and the housing 2 rotate relatively), an air flow enters the housing space of the cassette type seal structure 3 through the air intake passage, the air pressure inside the cassette type seal structure 3 is balanced with the air pressure outside the cassette type seal structure, and the air flow can cause the centrifugal lip 34 to be out of contact with the dust ring radial portion 332 (i.e., a certain slight space is created between the centrifugal lip 34 and the dust ring 33), which may be referred to as a hydrodynamic effect. Thus, on the one hand, while the centrifugal lip 34 ensures a good dynamic sealing effect, the slight gap ensures that the centrifugal lip 34 does not rub against the dust ring 33 rotating at high speed, thereby preventing wear of the centrifugal lip 34. On the other hand, the airflow entering from the intake passage can flow out through the minute space, thereby releasing the air pressure in the housing space and the first centrifugal groove 333 provided on the dust-proof ring 33 discharges the contaminants collected near the centrifugal lip 34 from the minute space (pumping effect).
In addition, the airflow flowing in from the intake passage can also cause the sub lip 35 to be out of contact with the shaft 1 (i.e., a certain minute space is created between the sub lip 35 and the shaft 1), which may also be referred to as a hydrodynamic effect. While the sub lip 35 ensures a good dynamic sealing effect, the lubricating medium accumulated in the vicinity of the sub lip 35 can be pumped to the inside of the shaft assembly by the action of the pump oil groove 353 of the sub lip 35 (pumping effect).
In this way, the cassette seal structure 3 according to the present invention can achieve good dynamic sealing and good pumping effect of the lubricating medium and contaminants.
(second embodiment)
As shown in fig. 5, the cassette seal structure 3 according to the second embodiment of the invention differs from the cassette seal structure 3 according to the first embodiment of the invention in that: the cassette seal structure 3 has only one centrifugal lip 34, and accordingly, only one turn of the first centrifugal groove 333 (shown in fig. 7) is provided corresponding to the one centrifugal lip 34; a gap is formed between the exoskeleton axial portion 311 and the housing 2 as an additional air accommodating space S3; the exoskeleton radial portion 312 has a structure that is bent axially outward.
Since one centrifugal lip 34 can achieve good static and dynamic sealing against contamination on the axially outer side of the cassette seal structure 3, in the present embodiment, only one centrifugal lip 34 is provided in the inner frame radial portion 322, and correspondingly, only one turn of the first centrifugal groove 333 is provided at a portion of the dust collar radial portion 332 that abuts the one centrifugal lip 34 (as shown in fig. 7).
In order to make the air pressure in the cassette seal structure 3 more stable, the outer frame axial portion 311 is provided with a structure recessed radially inward along the entire circumference of the circumferential direction C at the second air intake holes 313 (as shown in fig. 6), so that a gap is formed between the outer frame axial portion 311 and the housing 2 as an additional air accommodating space S3, and the additional air accommodating space S3 forms an annular air band, thereby achieving the above-described effects.
Since the axial dimension of the exoskeleton 31 inevitably becomes large when the above-described additional air accommodating space S3 is provided, it may cause the axial dimension of the entire cassette seal structure 3 to become large. In order to suppress the axial dimension of the entire cartridge seal structure 3 from becoming large, the exoskeleton radial portion 312 has a structure that is bent to the axially outer side such that the axial position of the sub-lip 35 in the present embodiment is substantially the same as the axial position of the sub-lip 35 in the first embodiment.
As shown in fig. 8, in the present embodiment, pump oil groove 353 does not extend obliquely to axial direction a, but extends along axial direction a.
The operation principle and the resulting effect of the cassette seal structure 3 according to the present embodiment are substantially the same as those of the cassette seal structure 3 of the first embodiment, and therefore, are not described in detail here.
(third embodiment)
As shown in fig. 9, the differences of the cassette seal structure 3 according to the third embodiment of the present invention with respect to the cassette seal structure 3 according to the first embodiment of the present invention include the following differences explained in the above-described second embodiment: a gap is formed between the exoskeleton axial portion 311 and the housing 2 as an additional air accommodating space S3; the exoskeleton radial portion 312 has a structure that is bent axially outward.
In addition, as shown in fig. 10, in the present embodiment, the dust collar radial portion 332 is provided with two turns of a plurality of centrifugal grooves extending substantially in the circumferential direction. Each turn of centrifugal slots includes a first centrifugal slot 333 and a second centrifugal slot 334 extending in opposite directions. One circumferential end of each first centrifugal groove 333 is located radially outward of the other circumferential end of the first centrifugal groove 333, and the width (dimension in the radial direction R) of each first centrifugal groove 333 gradually decreases from the other circumferential end toward the one circumferential end. The other circumferential end of each second centrifugal groove 334 is located radially outward of the one circumferential end of the second centrifugal groove 334, and the width (dimension in the radial direction R) of each second centrifugal groove 334 gradually decreases from the one circumferential end toward the other circumferential end. In this way, the centrifugal groove can be made to function as a pump for contaminants when the shaft 1 is rotated in both directions. Preferably, on each turn, the first centrifugal grooves 333 are arranged in pairs with the second centrifugal grooves 334.
As shown in fig. 11, in the present embodiment, each of the pump oil grooves 353 is partially annular (may be referred to as a semi-annular groove) in shape, and each of the pump oil grooves 353 has two openings at the axially inner end edge of the sub-lip axial portion 351. In this way, the pump oil groove 353 can function to pump the lubricating medium in both directions of the rotation of the shaft 1.
The operation principle and the resulting effect of the cassette seal structure 3 according to the present embodiment are substantially the same as those of the cassette seal structure 3 of the first embodiment, and therefore, are not described in detail here.
Further, although the technical solutions of the present invention are described in detail above through the specific embodiments of the present application, it should be noted that:
1. although in the above described embodiments only the seal according to the invention has been described for sealing shaft assemblies, the invention is not restricted thereto, but the seal according to the invention can also be used for sealing between other relatively rotatable two members, for example for sealing bearings.
2. Although not described in the above embodiment, it is preferable that the eccentric lip 34 and the sub-lip 35 are made of an elastic material such as rubber, and the outer frame 31, the inner frame 32, and the dust ring 33 are made of a rigid material such as metal.
3. Although not described in the above embodiment, it is preferable that the outer frame 31 and the inner frame 32 are separately press-molded. Of course, in some cases, the outer frame 31 and the inner frame 32 may be integrally molded.
4. By adopting the box type sealing structure 3 provided by the invention, the box type sealing structure 3 has good static sealing and dynamic sealing aiming at lubricating media and pollutants, the abrasion of the sealing lip of the box type sealing structure 3 can be prevented in the process of continuously feeding air through the air inlet channel, and the service life of the box type sealing structure 3 is prolonged. In addition, the box-type sealing structure 3 is compact (has a relatively small axial dimension) and is suitable for occasions with relatively strict size requirements.
By adopting the technical scheme, the invention provides the non-contact fluid dynamic pressure type box-type sealing structure which is close to zero leakage and zero friction.
The scope of protection of the present invention is not limited to the examples in the above-described embodiments, but falls within the scope of protection of the present invention as long as the combinations of the technical features of the claims of the present invention are satisfied.
Claims (9)
1. A cartridge type seal structure for sealing a first member and a second member which are relatively rotatable, the cartridge type seal structure being annular in shape as a whole, characterized by comprising:
a dust ring for securing to the first member;
the framework is used for being fixed on the second component, an accommodating space is formed between the framework and the dustproof ring, and an air inlet communicated with the accommodating space is formed in the framework; and
at least one centrifugal lip disposed on and extending from the skeleton to abut the dust collar, and configured to: when the first member and the second member are relatively rotated, the air flow flowing into the accommodating space from the air intake hole of the skeleton can separate the at least one centrifugal lip from the dust-proof ring by a predetermined interval and the air flow can flow out of the cassette seal structure from the interval.
2. The cassette sealing structure according to claim 1, wherein said skeleton includes an outer skeleton for fixation with said second member and an inner skeleton for fixation with said outer skeleton,
the outer frame is formed with the air inlet hole, and
the inner frame has the radial part of inner frame along radial extension, the radial part of inner frame will accommodation space partition becomes first space and the second space that communicates each other, first space with the inlet port intercommunication of outer frame, the second space with box type seal structure's outside intercommunication, at least one centrifugal lip set up in the radial part of inner frame and follow in the second space the radial part of inner frame extend with the dust ring butt.
3. The cartridge sealing structure of claim 2, wherein said dust collar has a radially extending dust collar radial portion, said at least one centrifugal lip abuts said dust collar radial portion, and
the dust collar radial portion is provided with a plurality of centrifugal grooves extending substantially in a circumferential direction at a portion of the dust collar radial portion that abuts the at least one centrifugal lip.
4. The cartridge sealing structure of claim 3, wherein the plurality of centrifugal slots includes a first centrifugal slot,
one circumferential end of the first centrifugal groove is located radially outward of the other circumferential end of the first centrifugal groove, and the width of at least a portion of the first centrifugal groove including the one circumferential end is gradually reduced toward the one circumferential end.
5. The cartridge sealing structure of claim 4, wherein the plurality of centrifugation slots further comprises a second centrifugation slot,
the circumferential other end of the second centrifugal groove is located radially outside the circumferential one end of the second centrifugal groove, and the width of at least a part of the second centrifugal groove including the circumferential other end is gradually reduced toward the circumferential other end.
6. The cassette seal structure according to any one of claims 1 to 5, further comprising a secondary lip provided to and extending from the backbone for abutment with the first member, and being provided to: when the first member and the second member are relatively rotated, the secondary lip portion can be separated from the first member by a predetermined interval by an air flow flowing into the accommodating space from the air intake hole of the frame.
7. The cartridge sealing structure according to claim 6, wherein at a site of the secondary lip for abutment with the first member, the secondary lip is provided with a plurality of pump oil grooves extending in an axial direction and/or obliquely with respect to the axial direction, the pump oil grooves being open at an axially inner end of the secondary lip, the pump oil grooves not being open at an axially outer end of the secondary lip.
8. The cassette sealing structure according to claim 6, wherein said secondary lip is provided with a plurality of semi-annular grooves at a portion thereof for abutment with said first member,
both ends of the semi-annular groove are open at the axially inner end edge of the secondary lip, and the semi-annular groove is not open at the axially outer end edge of the secondary lip.
9. The cassette seal structure according to any one of claims 1 to 5, wherein at a portion of the backbone where the air intake hole is formed, the backbone is provided with a recess along a circumferential entire circumference for forming an additional air accommodating space between the backbone and the second member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611037372.7A CN108087556B (en) | 2016-11-23 | 2016-11-23 | Box type sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611037372.7A CN108087556B (en) | 2016-11-23 | 2016-11-23 | Box type sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108087556A CN108087556A (en) | 2018-05-29 |
| CN108087556B true CN108087556B (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611037372.7A Active CN108087556B (en) | 2016-11-23 | 2016-11-23 | Box type sealing structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7123658B2 (en) * | 2018-06-25 | 2022-08-23 | Nok株式会社 | sealing device |
| CN110656900B (en) * | 2019-09-29 | 2020-12-01 | 中煤科工集团重庆研究院有限公司 | Non-contact drilling dust extraction cover |
| CN113324036A (en) * | 2021-05-29 | 2021-08-31 | 伯科姆汽车零部件***(苏州)有限公司 | Dustproof lip oil seal |
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|---|---|
| CN108087556A (en) | 2018-05-29 |
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