JPS5851476Y2 - sealing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device that is inserted between a spindle and a housing penetrated by the spindle to seal the gap between the spindle and the housing. The purpose of the present invention is to provide a sealing device that can be used in various ways, has excellent sealing properties, and can follow vibrations.

In a sealing device that maintains a sealing function against the gap between the spindle and the housing by press-inserting the packing into a packing land provided between a spindle and a housing that is penetrated by the spindle, it is difficult to insert the packing. Also, the pressure contact property of the packing against the surface of the spindle becomes a problem.

That is, as shown in FIG. 1, it is inserted into a packing gland 3 provided on the circumferential surface of the spindle 1 and the housing 2, and is pressed by a packing retainer 5 to seal the gap 6 between the spindle 1 and the housing 2. Patsukin 7 that works
In order to ensure sealing performance, the width in the radial direction is made larger than the distance between the circumferential surface of the spindle 1 and the inner circumferential surface of the packing gland 3, so it is difficult to insert it into the packing gland 3. Yes, when inserting it, there is a packing land 3.
There is a risk of being damaged by the ridge edge of the ring. Furthermore, when the seal 7 is worn and the sealing performance is reduced, the sealing performance can be restored by strongly suppressing the seal 7 with the seal suppressor 5. When the body is pressed in the axial direction, it is less likely to bulge inward in the radial direction than to bulge outward in the radial direction, so it is difficult to restore the sealing performance by increasing the closeness to the spindle circumferential surface.

Furthermore, there is no room for the elasticity of the gasket 7 to accommodate relative movement between the spindle 1 and the housing 2 due to vibrations caused by operation.

In the sealing device shown in FIG. 2, the packing 7 has a V-shaped cross-section, and is sandwiched between an adapter 9 having a protrusion with a cross-section of a ■-shape, and a packing retainer 5' having a concave groove with a V-shaped cross-section. By applying pressure, the inner and outer edges of the packing 7 are expanded and contracted radially outward and inward, thereby making strong pressure contact with the surfaces of the packing gland 3 and the spindle 1, thereby ensuring a sealing function. , a considerable improvement is recognized compared to the sealing device shown in Fig. 1, but the radial width dimension is approximately equal to or slightly larger than the width dimension of the packing insertion part, which eliminates the difficulty during insertion. First, it is similar to the sealing device shown in FIG. 1 in that it cannot sufficiently deal with leakage due to wear of the contact portion with the spindle surface and cannot absorb vibrations.

In view of the problems in the prior art described above, the present invention includes a packing having an annular base, a concave groove extending diagonally outward and diagonally inward from the annular base, and having a V-shaped cross section in the middle, and a groove at the tip. On the other hand, it is composed of an outer lip part and an inner lip part having an outer lip edge and an inner lip edge located on the annular base side, and in a free state, the outer lip edge is smaller than the inner diameter dimension of the housing. The inner lip edge is set to have an inner diameter larger than the outer diameter of the spindle, and the adapter inserted into the concave groove of the packing has a protrusion that has a chevron-shaped cross-sectional shape. The adapter is inserted into the groove of the packing by providing a shape that contacts the outer and inner sealing lips at the opening edge of the groove, but not at the sloped surface on the bottom side of the groove. The structure is such that the outer sealing lip expands outward and the inner sealing lip contracts inward to press against the inner circumferential surface of the packing gland and the outer circumferential surface of the spindle, thereby maintaining the sealing function. This makes it easy to insert into the packing gland, and the sealing performance is reliable.Furthermore, the elasticity of the sealing lip shows resistance to abrasion of the contact area, and it also prevents the spindle from moving against the housing due to vibration. It is adaptable to movement and maintains a normal sealing function over a long period of time.

Hereinafter, embodiments of the packing of the present invention will be described with reference to the drawings.

In the embodiment shown in FIG. 3, the gasket 7 has a V-shaped cross section and includes a base 11, an outer lip 12 extending diagonally outward from the base 11, and an inner lip 14 extending diagonally inward from the base 11. A concave structure 16 is formed, and the outer circumferential surface of the outer lip portion 12 and the inner circumferential surface of the inner lip portion 14 are both formed by truncated conical surfaces facing each other, thereby forming an outer lip edge 1.
3 and an inner lip edge 15, and the adapter 9
is provided with a protrusion 19 which has a tapered chevron shape and is fitted into the concave groove 16 of the packing.

Outer lip edge 13 and inner lip edge 1 of packing 7
5 has an outer lip edge 13 whose outer diameter is smaller than the inner diameter of the packing gland 3 so that it does not come into contact with the inner circumferential surface of the packing gland 3 and the outer circumferential surface of the spindle 1 in the free state. The inner diameter of the edge 15 is larger than the outer diameter of the spindle 1, and when the protrusion 19 of the adapter 9 is inserted into the groove 16, the outer lip 12 and the inner The structure is such that they come into contact at the open end of the side lip 14 and do not come into contact at the bottom of the groove 16.

The packing 7 and the adapter 9 having the structure described above are combined and pressed together, and the protrusion 19 of the adapter 9 pushes the outer lip 12 of the packing T outward and the inner lip 1.
4 inward, and press the outer lip edge 13 to the inner peripheral surface of the housing 2 and the inner lip edge 15 to the outer peripheral surface of the spindle 1, thereby closing the gap between the housing 2 and the spindle 1. 6 has a sealing effect.

In the embodiment shown in FIG. 4, an outer lip portion 12 and an inner lip portion 14 extend from the base 11 of the packing 7 to both sides in the axial direction to form grooves 16 on both sides in the axial direction. An adapter 9 having a protrusion 19 is inserted into the housing 2 and the spindle 1. The structure of each lip of the seal 7 and the protrusion 19 of the adapter 9 is the same as in the embodiment shown in FIG. It acts as a seal against the leakage of pressure fluid from the slit 6 and the intrusion of dust etc. from the outside.

In another embodiment shown in FIG. 5, the pressure fluid introduced into the inlet 21 formed in the housing 2 is sent to the guide hole 22 formed in the spindle 1, which acts as a seal against the pressure fluid. For this purpose, the two gaskets 7 are placed facing each other, and the adapter 9 is provided with two protrusions 19 that project in opposite directions and a communication hole 23 that runs in the radial direction, and is interposed between the two gaskets 7. The pressure fluid is sealed against the pressure fluid introduced from the introduction holes ±1, and the pressure fluid is sent to the guide hole 22 through the communication hole 23.

The structures of the lips of the gasket 7 and the protrusions of the adapter 9 are the same as in the embodiment shown in FIG.

Since the packing of the present invention has the above-mentioned constituent requirements, the following effects are brought about.

The adapter 9 contacts the packing 7 only at the opening side ends of the outer lip portion 12 and the inner lip portion 14, and the outer lip edge 13 and the inner lip edge 15 are directed outward and inward. In the free state, the inner and outer peripheries of the packing 7 maintain a gap with the circumferential surface of the spindle 1 and the inner circumferential surface of the packing land 3, respectively. The gasket 7 can be easily inserted, and when the gasket 7 and the adapter 9 are appropriately pressed together, a reliable sealing function is ensured.

Furthermore, each lip edge 13, 15 is located between the connecting part between each lip part 12.14 of the packing 7 and the base part 11, and the contact part between each lip part 12.14 and the protruding part 19 of the adapter 9. Since each lip portion 12.14 is maintained in a state of elastic bending deformation, the lip edge 13.
．． 15, the pressure contact of the lip edge is maintained to prevent deterioration of the sealing function due to wear, and it also adapts to the relative movement of the spindle and housing due to vibrations caused by operation. The sealing function can be maintained.

In the illustrated embodiment, the cross-sectional shapes of the concave groove 16 of the packing 7 and the protrusion 19 of the adapter 9 are each shown as part of an isosceles triangle, but the shape is not limited to this, and the lip portion A combination of circular arc shapes with different radius dimensions, or a combination of a circular arc shape and a triangular shape, will have the same effect as long as they contact each other at the open end of the groove and do not contact each other at the bottom of the groove. Effects can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing the structure of a packing according to the prior art, and FIGS. 3 to 5 are sectional views showing an embodiment of the sealing device of the present invention, respectively. 1... Spindle, 2... Housing, 3... Packing gland, 5,5'...
・・Putskin suppressed, 6・・・・ Slit, 7・・・・
・Packskin, 9...Adapter, 11...
・Base, 12... Outer lip part, 13...
...Outer lip edge, 14...Inner lip part,
15...Inner lip edge, 16...Concave groove, 19...Protrusion, 21...Introduction hole, 22... Guide hole, 23...Connection hole

Claims (1)

[Scope of utility model registration request] an annular base 11; an outer lip edge 1 extending obliquely outward from the base 11; located on the base 11 side with respect to the tip; and having an outer diameter smaller than the inner diameter of the housing 2;
3 and the outer diameter of the spindle 1 extending obliquely inward from the base 11 and passing through the housing 2 on the base 11 side with respect to the tip. The packing 7 is made of a rubber-like elastic material and has an inner edge 15 indicating an inner diameter dimension and an inner lip part 14 forming a groove 16 with the outer lip part 12. It has a protrusion 1.9 indicating the cross-sectional shape of the mold,
When the adapter 9 is inserted into the groove 16, when the adapter 9 is inserted into the groove 16,
The outer lip portion 12 and the inner lip portion 14 are in contact with the gasket 7 at the opening side edges thereof, and are not in contact with the sloped surface portion of the groove 16, so that the gasket 7 and the adapter 9 When the base 11 and the adapter 9 are pressed closer together, the adapter 9
A sealing device in which a projection 19 tilts the outer lip 12 outward and the inner lip 14 inward, respectively.