CN205479346U - Sealing device - Google Patents

Abstract

The utility model provides a sealing device, peripheral part through seeking sealing device and the seal structure's between the casing rationalization for even long -term use also can restrain the degradation of sealing effectively, can ensure stable sealing performance. This sealing device includes: have the 1st sealing washer member that is become by elastomer of the 1st sealed lip of outer peripheral face that can the sliding contact rotation axis and the cylindrical case partly at least who holds the 1st sealing washer member, cylindrical case has a sealed coating layer of the outer peripheral face that covers this cylindrical case, and outer peripheral face that should sealed coating layer forms to a plurality of cyclic annular convex parts.

Description

Sealing device

Technical field

This utility model relates to a kind of sealing device, and it seals between the rotary shaft in having the housing of axis hole and being assembled to the axis hole of this housing, prevents being accommodated in the fluid that sealed sealing in space and leaking to atmospheric side.

Background technology

As conventional sealing device, for example, as it is known that such a sealing device, it is used for around the rotary shaft of the compressor in the air-conditioning device etc. of seal automobile, by the sealing ring component of the outer peripheral face of sliding contact rotary shaft, maintains the sealing state sealing space.The sealing ring component constituting such sealing device is made up of elastomeric materials such as the rubber of sealing property excellence, the sealed lip making the leading section of composition sealing ring component is in the state always contacted with the outer peripheral face of rotary shaft, thus in being sealed to the machine of compressor that is filled into of sealed object in space by seal fluid, i.e. refrigerant gas and lubricating oil, and, be set to space in machine seal space, prevent from being sealed fluid in machine space to External leakage.

Conventional sealing device 100, as shown in Figure 1, including: having can be with the 1st sealing ring component 110 being made up of elastomer of the 1st sealed lip 111 of the outer peripheral face sliding contact of rotary shaft 160, with the cylindrical case 120 being made of metal that the 1st sealing ring component 110 is contained in inside, in addition, 1st sealing ring component 110 also includes: the heavy wall base portion 112 extended to radial outside from one end of the air Y side of the 1st sealed lip 111, the reinforcing ring 170 being made of metal being embedded in this heavy wall base portion 112.

Cylindrical case 120 has at outer circumferential side: the annular recessed portion 121 of the O 180 of the elastically deformable that the inner peripheral surface 152 for installing with axis hole 151 is close to, by sealing device 100 being flush-mounted in the axis hole 151 of housing 150 when O 180 being assemblied in these annular recessed portion 121, make the sealing property between the peripheral part and housing 150 of sealing device 100, guaranteed by the O 180 between them.The external diameter of O 180 is generally set to more slightly larger than the maximum outside diameter of cylindrical case 120, when sealing device 100 is flush-mounted in the axis hole 151 of housing 150, O 180 elastic compression is deformed into the diameter roughly the same with the outer peripheral face of cylindrical case 120, thus is close to the peripheral part of sealing device 100 and housing 150 respectively and is clamped.

In conventional sealing device 100, in order to obtain the sealing between its peripheral part and housing 150 Can, O 180 is required component.But, O 180, the most in high temperature environments, the particularly air Y side at contact extraneous air exists along with the passage of the time of use occurs deterioration the tendency being passivated.Therefore, the sealing property between the peripheral part and housing 150 of sealing device 100 reduces, and in the worst case, the fluid in sealing space likely leaks into air Y side.

Utility model content

Utility model problem to be solved

The purpose of this utility model is to provide a kind of sealing device, by seeking the rationalization of the sealing structure between the peripheral part of sealing device and housing so that even if life-time service can also suppress the deterioration of sealing effectively, and guarantee stable sealing property.

For solving the scheme of problem

To achieve these goals, purport structure of the present utility model is as described below.

(1) a kind of sealing device, seal between the rotary shaft in there is the housing of axis hole and being flush-mounted in the described axis hole of this housing, with to the fluid-tight sealed in space, it is characterized in that, this sealing device includes: having can the 1st sealed lip of outer peripheral face of rotary shaft described in sliding contact, the 1st sealing ring component being made up of elastomer, with at least one of cylindrical case accommodating the 1st sealing ring component, wherein, described cylindrical case has the sealing coating of the outer peripheral face covering this cylindrical case, the outer peripheral face of this sealing coating is formed as multiple annular convex.

(2) according to the sealing device described in above-mentioned (1), it is characterised in that described annular convex is two.

(3) according to the sealing device described in above-mentioned (1) or (2), it is characterized in that, described cylindrical case also accommodates: be positioned at the side i.e. rear side contrary with described sealing space of described 1st sealing ring component, and having can be with the 2nd sealed lip of the outer peripheral face sliding contact of described rotary shaft, the 2nd sealing ring component that is formed from a resin；Be positioned at the rear side of described 2nd sealing ring component, support the support ring component of described 2nd sealing ring component.

(4) according to above-mentioned (1) to the sealing device according to any one of (3), it is characterized in that, described 1st sealing ring component is formed by identical encapsulant with described sealing coating, described cylindrical case is embedded in described encapsulant, is also used as the reinforcing ring strengthening described 1st sealing ring component.

Effect of the present utility model

According to this utility model, cylindrical case has the sealing coating of the outer peripheral face covering this cylindrical case, by the peripheral part sealing coating is formed as multiple annular convex, among multiple annular convex, it is prevented from due to the existence of the annular convex of atmospheric side and the contacting of extraneous air in the annular convex sealing side, space, can effectively suppress the passivation that the deterioration sealing the annular convex of side, space causes, so, sealing property between peripheral part and the housing of sealing device reduces the most hardly even across long-time use, such that it is able to provide a kind of stable sealing device.

Accompanying drawing explanation

Fig. 1 is the half sectional view of conventional sealing device using O, shown in broken lines be fitted to housing axis hole time the allocation position of rotary shaft.

Fig. 2 is the half sectional view of sealing device of the present utility model, shown in broken lines be fitted to housing axis hole time the allocation position of rotary shaft.

The explanation of reference

1 sealing device

The 1st sealing ring component that 10 elastomers are made

11 the 1st sealed lips

11a lip leading section

11b the 1st cylindrical portion

12 heavy wall base portions

13 seal coating

14 annular convex

14a seals the annular convex of side, space

The annular convex of 14b atmospheric side

The cylindrical case that 20 metals are made

21 the 2nd cylindrical portion

22 the 1st inward end

23 the 2nd inward end

The 2nd sealing ring component that 30 resins are made

31 the 2nd sealed lips

32 anchor portion

40 support ring components

41 ring-type fixed parts

42 the 3rd cylindrical portion

43 export-oriented ends

50 housings

51 axis holes

The inner peripheral surface of 52 axis holes

60 rotary shafts

61 rotation axiss

100 sealing devices

110 the 1st sealing ring components

111 the 1st sealed lips

112 heavy wall base portions

The reinforcing ring that 140 metals are made

150 housings

151 axis holes

The inner peripheral surface of 152 axis holes

160 rotary shafts

170 o-rings

180 cylindrical cases

181 annular recessed portion

X seals space

Y air

Detailed description of the invention

Hereinafter, referring to the drawings embodiment of the present utility model is illustrated.

Fig. 2 shows the half of the longitudinal section according to sealing device 1 of the present utility model.

In the sealing device 1 shown in Fig. 2, mainly include the 1st sealing ring component 10 and cylindrical case 20.

1st sealing ring component 10 is made up of elastomer, is made up of the 1st sealed lip 11 and the heavy wall base portion 12 extended to radial outside from one end of the air Y side of the 1st sealed lip 11 in the embodiment shown in Figure 2.1st sealed lip 11 is by can be with the lip leading section 11a of the outer peripheral face of sliding contact rotary shaft 60 be formed concentrically the 1st cylindrical portion 11b of cylindrical shape at the outer circumferential side of rotary shaft 60 and constituted.

The lip leading section 11a of the 1st sealed lip 11 of the outer peripheral face of contact rotary shaft 60, tiltedly extend towards rotary shaft 60 to sealing space X inclination, and relative to outer peripheral face generation elastic deformation in the way of small area of contact is in close contact of the rotary shaft 60 rotated around rotation axis 61, thus form low contact resistance.By increasing the lip leading section 11a surface pressing relative to the outer peripheral face of rotary shaft 60 of the 1st sealed lip 11, it is possible to play sealing function, between the inner peripheral portion and rotary shaft 60 of sealing device 1, prevent being sealed fluid and leak to air Y side from sealing space X.

Cylindrical case 20 is made of metal, and accommodates at least some of of the 1st sealing ring component 10.As in figure 2 it is shown, the outer circumferential side that cylindrical case 20 has in rotary shaft 60 is formed concentrically the 2nd cylindric cylindrical portion 21.And have: it is bent the 1st inward end 22 of processing to radially inner side in the end of the sealing space X side of the 2nd cylindrical portion 21；The 2nd inward end 23 being bent to radially inner side by riveting processing with the end of the air Y side in the 2nd cylindrical portion 21.

In addition, in the sealing device 1 shown in Fig. 2, from improving from the viewpoint of the sealing property between the inner peripheral portion and the outer peripheral face of rotary shaft 60 of sealing device 1 further, show an example of the embodiment with the 2nd sealing ring component 30 being formed from a resin, described 2nd sealing ring component 30 is positioned at the rear side (air Y side in Fig. 2) of the 1st sealing ring component 10, and have can be with the 2nd sealed lip 31 of the outer peripheral face sliding contact of rotary shaft 60.2nd sealed lip 31 tiltedly extends towards rotary shaft 60 to sealing space X inclination.When rotary shaft 60 is fitted to be provided with in the axis hole 51 of the housing 50 of sealing device 1, there is elastic deformation in the 2nd sealed lip 31 in the same manner as the 1st sealed lip 11 of the 1st sealing ring component 10, become slidably contact rotary shaft 60 outer peripheral face be close to state.

The 2nd sealing ring component 30 shown in figure also has the anchor portion 32 in the cylindrical case 20 extending, being fixed on sealing device 1 from the 2nd sealed lip 31 to radial outside.

As the material of the 2nd sealing ring component 30, without specifying, the most preferably use the synthetic resin material of the low frictional properties such as politef (PTFE).

Sealing device 1 shown in Fig. 2 also has support ring component 40.Support ring component 40 is made of metal, and is positioned at the rear side of the 2nd sealing ring component 30, from rear support the 2nd sealing ring component 30 to limit its deformation.Support ring component 40 has: extend closely with the back side of the fixing end 32 of the 2nd sealing ring component 30, grips the ring-type fixed part 41 of anchor portion 32 together with the heavy wall base portion 12 of the 1st sealing ring component 10；Extend from radial outside one end of this ring-type fixed part 41 to air Y side, be formed concentrically columnar 3rd cylindrical portion 42 with rotary shaft 60；From the 3rd cylindrical portion 42 towards the outside end 43 of radial outside.

Being characterized mainly in that in structure of the present utility model, cylindrical case 20 has the sealing coating 13 of the outer peripheral face covering cylindrical case 20, the peripheral part of this sealing coating 13 is formed as multiple annular convex 14, by using such structure, among the plurality of annular convex 14, annular convex 14a sealing space X side is prevented from the contact with extraneous air due to the existence of annular convex 14b of air Y side, can suppress to result to seal the passivation of the deterioration of annular convex 14a of space X side, can be implemented in the sealing property steady in a long-term between the peripheral part of sealing device 1 and housing 50.

Seal coating 13 to be made up of rubber, and axis hole 51 is closely fit with.Seal coating 13 and can be adhered to the 2nd cylindrical portion 21 of cylindrical case 20 by bonding by Vulcanization, sealing coating 13 can be made up of the encapsulant identical with the 1st sealing ring component 10, cylindrical case 20 is buried underground into this encapsulant.By this structure, the sealing between the sealing between the peripheral part of sealing device 1 and housing 50, and the inner peripheral portion of sealing device 2 and rotary shaft 60 can be realized individually by the 1st sealing ring component 10.And, sealing device 1 as shown in Figure 2 is to bury cylindrical case 20 underground embodiment in the 1st sealing ring component 10.By burying underground in the 1st sealing ring component 10 by cylindrical case 20, cylindrical case 20 can be also used as the reinforcing ring strengthening the 1st sealing ring component 10.Accommodating function by the clamping making cylindrical case 20 not only have the 1st sealing ring component the 10, the 2nd sealing ring component 30 and support ring component 40, also have the 1st sealing ring component 10 adds powerful, it is possible to realize the simplification of the structure of sealing device 1.

Annular convex 14a shown in Fig. 2,14b are formed respectively along the rotation axis 61 of rotary shaft 60 with being spaced apart distance.Annular convex 14a of diagram, the maximum outside diameter position of 14b are set as more slightly larger than the maximum inner diameter position of the inner peripheral surface 52 of the axis hole 51 of housing 50.When being flush-mounted in the axis hole 51 of housing 50 by sealing device 1, elastic deformation occurs for annular convex 14a, 14b until its diameter is substantially the same with the outer peripheral face sealing coating 13, and is close to fix.

In addition, the situation shown in sealing device 1 of diagram is that the arranging number of the annular convex 14 of the peripheral part that will be formed in sealing coating 13 is set as that being capable of the minimum of effect of the present utility model arranges number that is two, but if necessary in the case of the sealing property that longer-term maintains between the peripheral part of sealing device 1 and housing 50 more reliably, it is also possible to be more than three.

Aforesaid content only shows an example of embodiment of the present utility model, can carry out various change in the range of utility model right requires.

Industrial applicability

According to this utility model, among multiple annular convex, it is prevented from due to the existence of the annular convex of atmospheric side and the contacting of extraneous air in the annular convex sealing side, space, can effectively suppress the passivation that the deterioration sealing the annular convex of side, space causes, so, sealing property between peripheral part and the housing of sealing device reduces, such that it is able to provide a kind of stable sealing device the most hardly even across long-time use.

Claims (5)

1. a sealing device, seals between the rotary shaft in having the housing of axis hole and being flush-mounted in the described axis hole of this housing, with to the fluid-tight sealed in space, it is characterised in that

This sealing device includes:

Have can rotary shaft described in sliding contact outer peripheral face the 1st sealed lip, the 1st sealing ring component be made up of elastomer, and

Accommodate at least one of cylindrical case of the 1st sealing ring component,

Wherein, described cylindrical case has the sealing coating of the outer peripheral face covering this cylindrical case,

The outer peripheral face of this sealing coating is formed as multiple annular convex.

Sealing device the most according to claim 1, it is characterised in that

Described annular convex is two.

Sealing device the most according to claim 1 and 2, it is characterised in that

Described cylindrical case also accommodates:

The 2nd sealing ring component being formed from a resin, this component is positioned at the side i.e. rear side contrary with described sealing space of described 1st sealing ring component, have can with the 2nd sealed lip of the outer peripheral face sliding contact of described rotary shaft, and

Support ring component, this component is positioned at the rear side of described 2nd sealing ring component, supports described 2nd sealing ring component.

Sealing device the most according to claim 1 and 2, it is characterised in that

Described 1st sealing ring component is formed by identical encapsulant with described sealing coating,

Described cylindrical case is embedded in described encapsulant, is also used as the reinforcing ring strengthening described 1st sealing ring component.

Sealing device the most according to claim 3, it is characterised in that

Described 1st sealing ring component is formed by identical encapsulant with described sealing coating,

Described cylindrical case is embedded in described encapsulant, is also used as the reinforcing ring strengthening described 1st sealing ring component.