CN108087556A - Cassette sealed structure - Google Patents

Abstract

The invention relates to the field of sealing, and more particularly relates to a box-type sealing structure. The box-type sealing structure is ring-shaped as a whole and includes: a dust-proof ring; a skeleton, which forms an accommodation space with the dust-proof ring, and the skeleton forms an air inlet communicating with the accommodation space; and at least one centrifugal lip, which is set and extending from the frame to abut against the dust ring. When the first member and the second member rotate relative to each other, the air flow from the air intake hole of the frame into the accommodation space can separate the at least one centrifugal lip from the dust ring by a predetermined interval and the air flow can flow out of the box seal structure from the interval. Thus, the present invention provides a box-type sealing structure, which can provide good static and dynamic sealing for the rotating assembly through the sealing of the sealing lip and the air sealing.

Description

Cassette sealed structure

technical field

The present invention relates to the field of sealing, more particularly to a box-type sealing structure used for sealing between components capable of relative rotation.

Background technique

The main shaft and bearings of today's glass machines often work in harsh environments and are surrounded by water vapor, fog and glass powder, so it is very important to protect the main shaft and bearings. In the prior art, the bearing is installed in the chamber of the glass machine, and the main shaft and the bearing are sealed by means of a labyrinth seal and an air seal. When the glass machine is working, the external air continuously enters the room where the bearing is installed through a specific channel and blows out the water vapor, mist and glass powder accumulated on the outside of the main shaft and the bearing through the stable air pressure. In addition, the labyrinth seal having a complex structure can also prevent contaminants from entering the chamber, making it possible to efficiently keep external contaminants away from the chamber through the labyrinth seal and air seal.

However, in the above solution, it is difficult for the labyrinth seal to protect the main shaft and the bearing through its own structure when the air seal is ineffective. When the input air pressure is unstable or weak (even zero), water vapor, mist and glass powder will easily enter the above-mentioned chamber, so that the sealing effect is greatly reduced.

Contents of the invention

The present invention has been made based on the above-mentioned defects of the prior art. The purpose of the present invention is to provide a box-type sealing structure, which can overcome the problem that the sealing effect of the sealing structure including the labyrinth seal and the air seal in the prior art is reduced when the air seal loses its effect.

In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions.

The present invention provides a box-type sealing structure as follows, which is used for the sealing of the first component and the second component that can rotate relatively. The box-type sealing structure is generally ring-shaped, and the box-type sealing structure includes: A dust ring, the dust-proof ring is used to be fixed to the first member; a skeleton, the skeleton is used to be fixed to the second member, an accommodation space is formed between the skeleton and the dust-proof ring, the The frame is formed with an air inlet communicating with the accommodation space; and at least one centrifugal lip is arranged on the frame and extends from the frame to abut against the dust ring, And the at least one centrifugal lip is configured such that when the first member and the second member rotate relative to each other, the airflow flowing into the accommodation space from the air intake hole of the frame can make the at least one centrifugal lip The lip is separated from the dust ring by a predetermined interval and the airflow is able to flow out of the cassette seal structure from the interval.

Preferably, the frame includes an outer frame fixed to the second member and an inner frame fixed to the outer frame, the outer frame is formed with the air intake hole, and the inner frame has a a radially extending radial portion of the inner frame, the radial portion of the inner frame divides the accommodating space into a first space and a second space communicating with each other, the first space communicates with the air inlet of the outer frame , the second space communicates with the outside of the box-type sealing structure, the at least one centrifugal lip is arranged on the radial part of the inner skeleton and extends from the radial part of the inner skeleton in the second space out to abut against the dust ring.

More preferably, the dust-proof ring has a radial part of the dust-proof ring extending in the radial direction, the at least one centrifugal lip abuts against the radial part of the dust-proof ring, and A plurality of centrifugal grooves extending substantially along the circumferential direction are provided on the radial portion of the dustproof ring at a portion of the radial portion abutting against the at least one centrifugal lip.

More preferably, the plurality of centrifugal grooves include a first centrifugal groove, one circumferential end of the first centrifugal groove is located radially outside the other circumferential end of the first centrifugal groove, and the first centrifugal groove includes The width of at least a portion of the one end in the circumferential direction gradually decreases toward the one end in the circumferential direction.

More preferably, the plurality of centrifugal grooves further include a second centrifugal groove, the other circumferential end of the second centrifugal groove is located radially outside of one circumferential end of the second centrifugal groove, and the second centrifugal groove A width including at least a portion of the other end in the circumferential direction gradually decreases toward the other end in the circumferential direction.

Preferably, the box-type sealing structure further includes an auxiliary lip, the auxiliary lip is arranged on the skeleton and extends from the skeleton for abutting against the first member, and the auxiliary lip It is arranged that: when the first member and the second member are relatively rotated, the airflow flowing into the accommodation space from the air intake hole of the framework can cause the auxiliary lip to be separated from the first member by a predetermined amount. interval.

More preferably, at the portion of the auxiliary lip for abutting against the first member, the auxiliary lip is provided with a plurality of axially extending and/or obliquely extending relative to the axial A pump oil groove, the pump oil groove is opened at the axially inner end edge of the auxiliary lip, and the pump oil groove is not opened at the axially outer end edge of the auxiliary lip.

More preferably, at the portion of the auxiliary lip for abutting against the first member, the auxiliary lip is provided with a plurality of semi-annular grooves, and both ends of the semi-annular grooves are at The axial inner end edge of the auxiliary lip is open, and the semi-annular groove is closed at the axial outer end edge of the auxiliary lip.

Preferably, at the position of the frame where the air intake hole is formed, the frame is provided with a depression along the entire circumference for forming additional air between the frame and the second member Accommodate space.

The cartridge seal assembly adopting the above specific structure can be used for the sealing of the following rotating assembly: the rotating assembly includes a first member and a second member capable of relative rotation and the cartridge seal structure can be arranged on the first member and the second member to seal the gap between the first member and the second member. The above-mentioned rotating assembly may be a shaft assembly or a bearing or the like. When the rotating assembly is a shaft assembly, the first member may be a shaft, and the second member may be a housing; when the rotating assembly is a bearing, the first member may be an inner ring of a bearing, and the second member may be an outer ring of a bearing .

By adopting the above-mentioned technical solution, the present invention provides a box-type sealing structure, which can provide good static and dynamic sealing for the rotating assembly through the sealing of the sealing lip and the air sealing, and even in the case of air sealing The sealing of the sealing lip can also play a good sealing effect in the case of failure. In addition, the sealing lip of the box-type sealing structure does not contact the dust-proof ring or the rotating assembly when the rotating assembly is working, so it is not easy to wear and tear, and the service life is increased.

Description of drawings

Fig. 1a is a partially cutaway perspective view of a shaft assembly equipped with a cartridge seal structure according to a first embodiment of the present invention; Fig. 1b is a schematic view showing a section of the shaft assembly in Fig. 1a; Fig. 1c is a schematic view of Fig. 1b A partially enlarged schematic diagram of the upper part of .

Fig. 2 is a schematic perspective view of the outer frame of the box-type sealing structure in Fig. 1a.

Fig. 3 is a schematic front view of the dustproof ring of the box-type sealing structure in Fig. 1a.

Fig. 4 is a schematic perspective view of the auxiliary lip of the box-type sealing structure in Fig. 1a.

5 is a partial enlarged schematic view of an upper side portion of a shaft assembly mounted with a cartridge seal structure according to a second embodiment of the present invention.

FIG. 6 is a schematic perspective view of the outer frame of the box-type sealing structure in FIG. 5 .

FIG. 7 is a schematic front view of the dustproof ring of the box-type sealing structure in FIG. 5 .

FIG. 8 is a schematic perspective view of the auxiliary lip of the box-type sealing structure in FIG. 5 .

9 is a partial enlarged schematic view of an upper side portion of a shaft assembly installed with a cartridge seal structure according to a third embodiment of the present invention.

FIG. 10 is a schematic front view of the dustproof ring of the box-type sealing structure in FIG. 9 .

FIG. 11 is a schematic perspective view of the auxiliary lip of the box-type sealing structure in FIG. 9 .

Explanation of reference signs

1 Shaft 2 Shell 21 First air inlet 3 Cassette seal structure 31 Outer skeleton 311 Axial part of outer skeleton 312 Radial part of outer skeleton 313 Second air inlet 32 Inner skeleton 321 Axial part of inner skeleton 322 Radial inner skeleton Part 33 Dustproof ring 331 Dustproof ring axial part 332 Dustproof ring radial part 333 First centrifugal groove 334 Second centrifugal groove 34 Centrifugal lip 35 Secondary lip 351 Secondary lip axial part 352 Secondary lip radial Part 353 pump sump

A Axial R Radial C Circumferential S1 First Space S2 Second Space S3 Additional Air Accommodating Space

Detailed ways

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the "axial" indicated by the mark A is the axial direction of the shaft assembly (cassette seal structure); the "radial" represented by the mark R is the radial direction of the shaft assembly (cassette seal structure); The "circumferential direction" represented by C is the circumferential direction of the shaft assembly (cassette seal structure). Unless otherwise stated, axially inner side refers to the left side in FIGS. 1 b , 1 c , 5 , and 9 , and axially outer side refers to the right side in FIGS. 1 b , 1 c , 5 , and 9 . Lubricants such as grease exist on the axially inner side of the cassette seal structure, and pollutants such as dust and steam exist on the axially outer side of the cassette seal structure.

The cassette seal structure according to the present invention can be used for the sealing of a rotary assembly including two components capable of relative rotation. The specific implementation of the present invention will be described below by taking the shaft assembly as the sealing object of the cartridge sealing structure according to the present invention. As mentioned above, the shaft assembly is an example of a rotating assembly, and the shaft assembly includes a relatively rotatable shaft and a housing, and the housing is located at a radially outer position of the shaft, wherein the shaft is the first member of the rotating assembly, and the housing is the second of the rotating assembly. Two components.

(first embodiment)

As shown in Fig. 1a to Fig. 1c, the box-type sealing structure 3 according to the first embodiment of the present invention is installed on the shaft 1 and the housing 2 which can rotate relatively, and the box-type sealing structure 3 is ring-shaped as a whole. In this embodiment, the box-type sealing structure 3 includes a skeleton (outer skeleton 31 and inner skeleton 32), a dustproof ring 33, a centrifugal lip 34 and an auxiliary lip 35, wherein the skeleton (outer skeleton 31) and the dustproof ring The space surrounded by 33 is the accommodation space.

In this embodiment, the frame includes an outer frame 31 and an inner frame 32 fixed to each other.

The outer frame 31 has an outer frame axial portion 311 extending along the axial direction A and an outer frame radial portion 312 extending radially inward along the radial direction R from the axially inner end of the outer frame axial portion 311 . The axial part 311 of the outer frame is fixed to the casing 2 of the shaft assembly, and the axial part 311 of the outer frame is provided with a second air inlet 313 (as shown in FIG. 2 ) as a radial through hole. When the axial part 311 of the outer frame is fixed to the casing 2, the second air inlet 313 communicates with the first air inlet 21 provided on the casing 2 and forms an air inlet passage, which communicates with the accommodation space to allow the outside Air can flow into the accommodation space. The auxiliary lip 35 is disposed at the radially inner end of the radial portion 312 of the outer frame.

The inner frame 32 has an inner frame axial portion 321 extending along the axial direction A and an inner frame radial portion 322 extending radially inward along the radial direction R from an axially inner end portion of the inner frame axial portion 321 . The axial part 321 of the inner frame is fixed to the axial part 311 of the outer frame in a manner that does not affect the communication between the intake passage and the accommodation space. The radial part 322 of the inner frame extends in the accommodation space and divides the accommodation space into a first space S1 and a second space S2 which are parallel in the axial direction A and communicate with each other. The second space S2 communicates with the axially outer side of the box-type sealing structure 3 . The centrifugal lip 34 is disposed on the radial portion 322 of the inner frame.

In this embodiment, the dustproof ring 33 has a dustproof ring axial portion 331 extending along the axial direction A and extends radially outward from the axially outer end portion of the dustproof ring axial portion 331 along the radial direction R. Radial portion 332 of the dust ring. The dust ring axial portion 331 is fixed to the shaft 1 of the shaft assembly. The radial portion 332 of the dust-proof ring abuts against the centrifugal lip 34, and a plurality of first centrifugal grooves 333 (as shown in FIG. 3 ) are arranged on the radial portion 332 of the dust-proof ring. The specific arrangement of the first centrifugal grooves 333 The method will be explained in the following content.

In this embodiment, two centrifugal lips 34 spaced apart from each other are provided on the inner frame radial portion 322 . Both centrifugal lips 34 are disposed in the second space S2 , and each centrifugal lip 34 extends radially outward from the radial portion 322 of the inner frame obliquely relative to the axial direction A. As shown in FIG. The thickness of each centrifugal lip 34 is relatively thin and elastic, so that the axially outer portion of each centrifugal lip 34 abuts against the radial portion 332 of the dustproof ring. In this way, when the dustproof ring 33 (shaft 1) is not rotating, the axially outer part of the centrifugal lip 34 can be pressed against the radial part 332 of the dustproof ring under the action of the elastic force of the centrifugal lip 34 itself and cover a plurality of The first centrifugal groove 333 creates a good static seal against the contaminants on the axially outer side of the cartridge sealing structure 3 .

In this embodiment, the auxiliary lip 35 is arranged at the radially inner end of the radial portion 312 of the outer frame and extends to the shaft 1, so that the elastic force of the auxiliary lip 35 itself when the shaft 1 does not rotate Under action, it can be pressed against the shaft 1 , so as to produce a good static seal against the lubricating medium axially inside the cassette sealing structure 3 . At the position where the auxiliary lip 35 abuts against the shaft 1, the auxiliary lip 35 is provided with a plurality of pumping oil grooves 353 (as shown in FIG. 4 ) for pumping the lubricating medium inward in the axial direction. The specific details of the oil pumping grooves 353 The setting method will be explained in the following content.

The arrangement of the first centrifugal groove 333 on the radial portion 332 of the dust ring and the arrangement of the oil pumping groove 353 on the auxiliary lip 35 will be described below with reference to FIGS. 3 and 4 .

As shown in FIG. 3 , in this embodiment, at the part of the radial portion 332 of the dustproof ring that is used to abut against the centrifugal lip 34 (the axial inner surface of the radial portion 332 of the dustproof ring), the dustproof The ring radial part 332 is provided with a plurality of first centrifugal grooves 333 extending approximately along the circumferential direction C, so that when the dustproof ring 33 rotates with the shaft 1, the airflow can be ensured to flow smoothly in the first centrifugal grooves 333 .

In this embodiment, one circumferential end of each first centrifugal groove 333 is located radially outside the other circumferential end of the first centrifugal groove 333, so that when the dustproof ring 33 rotates, the airflow flows from the first centrifugal groove 333 The other end in the circumferential direction flows into and flows out from the one end in the circumferential direction of the first centrifugal groove 333 , so that the pollutants accumulated at the first centrifugal groove 333 can be discharged radially outward.

In this embodiment, the width of the first centrifugal groove 333 (dimension in the radial direction R) undergoes a process of first gradually increasing and then gradually decreasing when extending from the other circumferential end to the circumferential end, so that the airflow can The flow rate in the first centrifuge tank 333 is faster.

In this embodiment, the shape of the first centrifugal groove 333 is an arc groove (also called a parabolic groove). In addition, a plurality of turns (two turns in this embodiment) of first centrifugal grooves 333 are provided corresponding to a plurality of (two turns in this embodiment) centrifugal lips 34 . A plurality of first centrifugal grooves 333 on one circle corresponding to one centrifugal lip 34 are arranged along the circumferential direction C on the entire circumference, and two adjacent first centrifugal grooves 333 may partially overlap in the radial direction R, In this way, a greater number of first centrifugal grooves 333 can be provided on one circle.

As shown in FIG. 4 , in the present embodiment, the auxiliary lip 35 has an auxiliary lip radial portion 352 extending along the radial direction R, and a radially inner end portion of the auxiliary lip radial portion 352 is substantially along the axis. Auxiliary lip axial portion 351 extending towards A. The auxiliary lip radial portion 352 is disposed at the radially inner end portion of the outer frame radial portion 312 . The auxiliary lip axial portion 351 is intended to abut against the shaft 1 . At the position where the auxiliary lip axial portion 351 abuts against the shaft 1 (that is, the radial inner side of the auxiliary lip axial portion 351), the auxiliary lip axial portion 351 is provided with a plurality of A pump oil groove 353 extending obliquely. In this embodiment, a plurality of pump oil grooves 353 are uniformly arranged on the entire circumference along the circumferential direction C, and two adjacent pump oil grooves 353 are spaced apart from each other.

In this embodiment, the axially inner end of the pump oil groove 353 opens at the axially inner end edge of the auxiliary lip 35, but the axially outer end of the pump oil groove 353 terminates in the auxiliary lip 35 (that is, the end of the pump oil groove 353 The axially outer end has no opening at the axially outer end edge of the auxiliary lip 35). In this way, the lubricating medium on the axially inner side of the cartridge-type sealing structure 3 can hardly flow into the accommodation space of the cartridge-type sealing structure 3 even after entering through the axially inner end of the pump oil groove 353 .

It should be noted that both the first centrifugal groove 333 and the pump oil groove 353 provided in this embodiment are suitable for the case where the shaft 1 rotates in one direction. In addition, the rotation direction of the shaft 1 should ensure that the first centrifugal groove 333 can finally discharge the pollutants to the axial outside of the cartridge seal structure, and ensure that the pump oil groove 353 can pump the lubricating medium to the axial direction of the cartridge seal structure. inside.

The working principle and effects of the box-type sealing structure 3 of this embodiment will be described below.

(1) static seal

When the dustproof ring 33 and the shaft 1 do not rotate (that is, the shaft 1 and the housing 2 do not rotate relative to each other), there is no air flow in the air intake passage into the accommodation space of the box-type sealing structure 3, and the centrifugal lip 34 is pressed against the diameter of the dustproof ring To the portion 332 to achieve a good static seal against the axially outer contaminants, and the auxiliary lip 35 is pressed against the shaft 1 to achieve a good static seal against the axially inner lubricating medium.

(2) Dynamic sealing and pumping effect

When the dustproof ring 33 rotates together with the shaft 1 (that is, the shaft 1 and the housing 2 rotate relative to each other), the airflow enters the accommodation space of the box-type sealing structure 3 through the air intake passage, and the air pressure in the box-type sealing structure 3 is in line with the external air pressure. When the air pressure is balanced, the air flow can make the centrifugal lip 34 and the radial part 332 of the dustproof ring out of contact (that is, a certain small interval is generated between the centrifugal lip 34 and the dustproof ring 33), which can be called fluid dynamics. pressure effect. In this way, on the one hand, while the centrifugal lip 34 ensures a good dynamic sealing effect, the small interval can ensure that the centrifugal lip 34 will not rub against the high-speed rotating dust ring 33, thereby preventing the centrifugal lip 34 from wear and tear. On the other hand, the airflow entering from the air intake channel can flow out through the tiny gap, thereby releasing the air pressure in the accommodation space and the first centrifugal groove 333 provided on the dustproof ring 33 will gather the pollution near the centrifugal lip 34 The material is expelled from this tiny gap (pumping effect).

In addition, the airflow flowing in from the intake passage can also make the auxiliary lip 35 out of contact with the shaft 1 (that is, create a certain small gap between the auxiliary lip 35 and the shaft 1), which can also be called the hydrodynamic effect . While the auxiliary lip 35 ensures a good dynamic sealing effect, the lubricating medium gathered near the auxiliary lip 35 can be pumped to the inside of the shaft assembly through the action of the pump oil groove 353 of the auxiliary lip 35 (pumping effect).

In this way, the box-type sealing structure 3 according to the present invention can achieve good dynamic sealing and good pumping effect on lubricating medium and pollutants.

(second embodiment)

As shown in FIG. 5 , the difference between the box-type sealing structure 3 according to the second embodiment of the present invention and the box-type sealing structure 3 according to the first embodiment of the invention is that the box-type sealing structure 3 only has one centrifugal The lip 34 corresponds to the first centrifugal groove 333 (as shown in Figure 7 ) which is only provided with one circle of the centrifugal lip 34; a gap is formed between the outer skeleton axial part 311 and the shell 2 as an additional air accommodation Space S3; the radial portion 312 of the outer frame has a structure bent axially outward.

Since one centrifugal lip 34 can achieve good static and dynamic sealing of pollutants on the axially outer side of the box-type sealing structure 3, in this embodiment, only one centrifugal lip 34 is provided on the inner frame radial portion 322 The lip portion 34 is correspondingly provided with only one round of the first centrifugal groove 333 (as shown in FIG. 7 ) at the position where the radial portion 332 of the dustproof ring abuts against the one centrifugal lip portion 34 .

In order to make the air pressure in the box-type sealing structure 3 more stable, the axial part 311 of the outer skeleton is provided with a structure concaved radially inward along the entire circumference of the circumferential direction C at the second air inlet 313 (as shown in FIG. 6 . Shown), in this way, a gap is formed between the axial part of the outer frame 311 and the shell 2 as an additional air containing space S3, and the additional air containing space S3 forms an annular air belt, thereby achieving the above effect.

Since the axial dimension of the outer frame 31 inevitably becomes larger when the additional air containing space S3 is provided, the axial dimension of the entire box-type sealing structure 3 may become larger. In order to prevent the axial dimension of the entire box-type sealing structure 3 from becoming larger, the radial portion 312 of the outer skeleton has a structure bent axially outward, so that the axial position of the auxiliary lip 35 in this embodiment is the same as that of the first The axial positions of the auxiliary lip 35 in the embodiment are substantially the same.

In addition, as shown in FIG. 8 , in the present embodiment, the pump oil groove 353 does not extend obliquely with respect to the axial direction A, but extends along the axial direction A. As shown in FIG.

The working principle and effects of the box-type sealing structure 3 according to the present embodiment are basically the same as those of the box-type sealing structure 3 in the first embodiment, so details will not be repeated here.

(third embodiment)

As shown in FIG. 9 , the differences of the cassette-type sealing structure 3 according to the third embodiment of the present invention relative to the cassette-type sealing structure 3 according to the first embodiment of the present invention include the following differences explained in the above-mentioned second embodiment. : A gap is formed between the axial portion 311 of the outer frame and the housing 2 as an additional air containing space S3; the radial portion 312 of the outer frame has a structure bent axially outward.

In addition, as shown in FIG. 10 , in this embodiment, the radial portion 332 of the dust-proof ring is provided with a plurality of centrifugal grooves extending substantially along the circumferential direction in two turns. Each circle of centrifugal grooves includes a first centrifugal groove 333 and a second centrifugal groove 334 extending in opposite directions. One circumferential end of each first centrifugal groove 333 is located radially outside 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 is from the other circumferential end to the circumferential direction. taper off towards one end. The other circumferential end of each second centrifugal groove 334 is located radially outside one circumferential end of the second centrifugal groove 334, and the width of each second centrifugal groove 334 (dimension in the radial direction R) is from one circumferential end to the circumferential direction. taper off at the other end. In this way, the centrifugal tank can be used to pump pollutants when the shaft 1 rotates in both directions. Preferably, on each turn, the first centrifugal groove 333 and the second centrifugal groove 334 are arranged in pairs.

As shown in Figure 11, in this embodiment, the shape of each pump oil groove 353 is partly annular (can be called a semi-annular groove), and each pump oil groove 353 is in the axial direction of the auxiliary lip axial part 351. There are two openings at the inner end edge. In this way, the oil pump groove 353 can be used to pump lubricating medium when the shaft 1 rotates in both directions.

The working principle and effects of the box-type sealing structure 3 according to the present embodiment are basically the same as those of the box-type sealing structure 3 in the first embodiment, so details will not be repeated here.

Further, although the technical solution of the present invention has been described in detail through the specific implementation of the application above, it still needs to be explained that:

1. Although the above specific embodiments only illustrate that the seal according to the present invention is used for sealing the shaft assembly, the present invention is not limited thereto, and the seal according to the present invention can also be used for other two components that can rotate relatively The seal between them, for example for bearings.

2. Although there is no description in the above-mentioned specific embodiment, preferably, the centrifugal lip 34 and the auxiliary lip 35 are made of elastic materials such as rubber, and the outer skeleton 31, the inner skeleton 32 and the dustproof ring 33 are made of metal or the like. Made of rigid material.

3. Although not described in the above specific embodiments, preferably, the outer frame 31 and the inner frame 32 are stamped and formed separately. Of course, in some cases, the outer frame 31 and the inner frame 32 can also be formed integrally.

4. By adopting the box-type sealing structure 3 of the present invention, the box-type sealing structure 3 has good static and dynamic sealing against lubricating media and pollutants, and can also prevent The wear of the sealing lip of the box-type sealing structure 3 improves the service life of the box-type sealing structure 3 . In addition, the box-type sealing structure 3 has a compact structure (with a relatively small axial dimension), and is suitable for occasions with relatively strict size requirements.

By adopting the above-mentioned technical solution, the present invention provides a non-contact fluid dynamic pressure cartridge sealing structure close to zero leakage and zero friction.

The protection scope of the present invention is not limited to the examples in the above specific implementation manners, but as long as the combination of the technical features of the claims of the present invention is satisfied, it falls within the protection scope of the present invention.

Claims (9)

1. a kind of cartridge seal structure is used for the sealing for the first component and second component that can be relatively rotated, the boxlike Sealing structure is integrally annular in shape, which is characterized in that the cartridge seal structure includes：

Dust ring, the dust ring are used to be fixed on the first component；

Skeleton, the skeleton are used to be fixed on the second component, and accommodation space is formed between the skeleton and the dust ring, The skeleton is formed with the air admission hole connected with the accommodation space；And

At least one centrifugation lip, it is described it is at least one centrifugation lip be arranged at the skeleton and from the skeleton extend with The dust ring abuts, and at least one centrifugation lip is configured to：When the first component and the second component During relative rotation, the air-flow of the accommodation space is flowed into from the air admission hole of the skeleton can make at least one centrifugation lip Predetermined space is separated with the dust ring and the air-flow can flow out the cartridge seal structure from the interval.

2. cartridge seal structure according to claim 1, which is characterized in that the skeleton include for second structure The fixed outer skeleton of part and with the outer fixed inner frame of skeleton,

The outer skeleton is formed with the air admission hole, and

The inner frame has the inner frame radial component radially extended, and the inner frame radial component accommodates sky by described Between be separated into the first space to communicate with each other and second space, first space is connected with the air admission hole of the outer skeleton, institute It states second space to connect with the external of the cartridge seal structure, at least one centrifugation lip is arranged at the inner frame footpath To part and extend to abut with the dust ring from the inner frame radial component in the second space.

3. cartridge seal structure according to claim 2, which is characterized in that the dust ring has what is radially extended Dust ring radial component, at least one centrifugation lip are abutted with the dust ring radial component, and

At the position abutted at least one centrifugation lip of the dust ring radial component, the dust ring radial part Set up the multiple eccentric grooves being equipped with approximately along circumferentially extending separately.

4. cartridge seal structure according to claim 3, which is characterized in that the multiple eccentric groove includes the first centrifugation Slot,

Circumferential one end of first eccentric groove is located at the radial outside of the circumferential other end of first eccentric groove, described first from At least part of width for including described circumferential one end of heart slot is gradually reduced towards the circumferential direction one end.

5. cartridge seal structure according to claim 4, which is characterized in that the multiple eccentric groove further includes the second centrifugation Slot,

The circumferential other end of second eccentric groove is located at the radial outside of circumferential one end of second eccentric groove, described second from At least part of width for including the circumferential other end of heart slot is gradually reduced towards the circumferential direction other end.

6. cartridge seal structure according to any one of claim 1 to 5, which is characterized in that the cartridge seal structure Secondary lip is further included, the pair lip is arranged at the skeleton and extends to support with the first component from the skeleton It connects, and the secondary lip is configured to：When the first component and the second component relatively rotate, from the skeleton The air-flow that air admission hole flows into the accommodation space can make the secondary lip separate predetermined space with the first component.

7. cartridge seal structure according to claim 6, which is characterized in that in being used for and described first for the secondary lip At the position that component abuts, the pair lip, which is provided with, to be axially extended and/or compared with axially inclined extends multiple Pump oil slot, pump oil slot opening at the axially inner side ora terminalis of the secondary lip, the pump oil slot is in the axis of the secondary lip It is not open at ora terminalis outward.

8. cartridge seal structure according to claim 6, which is characterized in that in being used for and described first for the secondary lip At the position that component abuts, the pair lip is provided with multiple semicircular slots,

The both ends of semicircular slot opening at the axially inner side ora terminalis of the secondary lip, the semicircular slot is in the pair It is not open at the axially external ora terminalis of lip.

9. cartridge seal structure according to any one of claim 1 to 5, which is characterized in that in the formation of the skeleton At the position of the air admission hole, the skeleton is provided with the recess of circumferentially complete cycle in the skeleton and described second Additional air accommodation space is formed between component.