CN203756986U - Sealing structure - Google Patents

Abstract

The utility model provides a sealing structure can improve the sealing performance of the structure that makes the packing ring paste tight 3 parts respectively. The utility model discloses a seal structure has inner tube (200), outer tube (300), casing (400) and gasket (100) of the rubbery elastic system that pastes respectively with them, its characterized in that, sets for the distance from the terminal surface of casing (400) to the axis direction of setting up in the cyclic annular protruding portion (220) of inner tube (200) and is greater than the radial dimension of the annular clearance between inner tube (200) and outer tube (300) to gasket (100) include: a cylindrical gasket body (110) having one end surface (140) that is in close contact with an end surface (410) of the housing (400) and the other end surface (150) that is in close contact with a planar side surface (221) of the annular protrusion (220); a 1 st annular projection (120) provided on the inner peripheral surface side of the gasket main body (110); and a 2 nd annular projection (130) provided on the outer peripheral surface side of the gasket main body (110).

Description

sealed structure

technical field

The utility model relates to a sealing structure using a washer.

Background technique

Conventionally, there is known a technique of sealing the gaps between the three members by bringing gaskets into close contact with each of the three members (see Patent Document 1). An example of such techniques will be described with reference to FIG. 7 . Fig. 7 is a schematic sectional view showing a sealing structure of a prior art example.

In this prior art, the O-ring 900 is closely attached to three members, namely, the inner tube 600 , the outer tube 700 , and the housing 800 of the device to which the inner tube 600 and the outer tube 700 are attached.

The inner tube 600 is inserted into the tube of the outer tube 700, and the outer tube 700 and the casing 800 are fixed with fasteners such as bolts. The inner tube 600 is positioned and fixed by the fastening force generated by the O-ring 900 and the like. In a state where the inner tube 600 and the outer tube 700 are assembled to the housing 800 , the outer peripheral surface 610 of the inner tube 600 and the inner peripheral surface of the outer tube 700 are arranged concentrically. The end face 810 of the housing 800 is opposite the end face of the inner tube 600 and the end face of the outer tube 700 .

A tapered surface 710 that increases in diameter toward the front end is provided on the inner peripheral surface side of the front end side of the outer tube 700 . Between the tapered surface 710, the outer peripheral surface 610 of the inner pipe 600, and the end surface 810 of the casing 800, an annular space having a substantially triangular cross section is formed. O-ring 900 is arranged in this annular space. Thus, the O-ring 900 is in close contact with the tapered surface 710 of the outer tube 700 , the outer peripheral surface 610 of the inner tube 600 and the end surface 810 of the housing 800 . With this structure, the gaps between the inner tube 600, the outer tube 700, and the housing 800 are sealed.

In the prior art described above, since the outer tube 700 and the casing 800 are fixed by fasteners such as bolts, they are closely attached to each other. However, since the inner tube 600 is positioned only by the fastening force generated by the O-ring 900 or the like, a gap S is generated between the inner tube 600 and the housing 800 . When the gap S is too large, the O-ring 900 cannot fully exhibit the sealing performance. In order to exert the sealing performance stably, the O-ring 900 must be fully attached to the tapered surface 710 of the outer tube 700 , the outer peripheral surface 610 of the inner tube 600 and the end surface 810 of the housing 800 . In order to achieve the above purpose, it is necessary to improve the dimensional accuracy of each component. Therefore, it is also necessary to improve the machining accuracy of the tapered surface 710 . In addition, in the case of the O-ring 900 , even if the initial dimensional accuracy is improved, the dimensional accuracy decreases with the passage of time.

As mentioned above, in the above-mentioned prior art, it is difficult to stably exert the sealing performance.

prior art literature

patent documents

Patent Document 1: Japanese Invention Patent Publication No. 6-213088

Utility model content

The purpose of this utility model is to provide the sealing structure which improves the sealing performance in the structure which makes the gasket stick to three members respectively.

The utility model adopts the following means for solving the above problems.

That is, the sealing structure of the present invention includes a first member having an outer peripheral surface, a second member having an inner peripheral surface concentrically arranged with the outer peripheral surface, and an end face with the first member and an end face of the second member. The third part of the end face, and the gasket made of rubber elastic body that seals the gaps between the above-mentioned parts by being in close contact with the first part, the second part and the third part respectively, wherein

A first annular protruding portion protruding radially outward from the outer peripheral surface side of the first member or a second annular protruding portion protruding radially inward from the inner peripheral surface side of the second member is provided, and is set from The axial distance from the end surface of the third member to the first annular protrusion or the second annular protrusion is greater than the radial dimension of the annular gap between the outer peripheral surface of the first member and the inner peripheral surface of the second member ,and

The gasket has a cylindrical gasket body part, one end surface of which is in close contact with the end surface of the third member, and the other end surface is in close contact with the flat surface of the first annular protrusion or the second annular protrusion. a side surface; a first annular protrusion, which is arranged on the inner peripheral surface side of the gasket body, and is in close contact with the outer peripheral surface of the first member; and a second annular protrusion, which is arranged on the outer periphery of the gasket body face side, close to the inner peripheral surface of the second part,

In the state where no external force acts on the gasket, the distance from one end surface of the gasket body to the other end surface is greater than the distance from the first part, the second part, and the third part when the first part, the second part and the third part are assembled together. The axial distance from the end surface of the 3-member to the first annular protrusion or the second annular protrusion is large, and

In the state where no external force acts on the gasket, the inner diameter of the gasket body is larger than the outer diameter of the outer peripheral surface of the first member, the inner diameter of the front end of the first annular protrusion is smaller than the outer diameter of the outer peripheral surface of the first member, and the The outer diameter of the washer main body is smaller than the inner diameter of the inner peripheral surface of the second member, and the outer diameter of the tip of the second annular protrusion is larger than the inner diameter of the inner peripheral surface of the second member.

According to the present invention, with the above configuration, in the cylindrical washer body part, the dimension in the axial direction becomes longer than the thickness in the radial direction. Therefore, the gasket body portion is easily compressed in the axial direction. Therefore, even when there is a gap between the first member and the third member or between the second member and the third member, since the gasket main body is compressed in the axial direction, it is possible to stably seal the third member. The gap between the end face and the first annular protrusion or the second annular protrusion.

In the gasket, only the portions of the first annular protrusion and the second annular protrusion are compressed to be in close contact with the first member and the second member, thereby reducing the packing rate of the gasket in the space where the gasket is mounted. Therefore, the load at the time of mounting the gasket can be reduced. In addition, it is possible to suppress the gasket from being forcibly deformed. As a result, the sealing performance can be stably exhibited.

As described above, according to the present invention, it is possible to improve the sealing performance in the structure in which the gaskets are respectively brought into close contact with the three members.

Description of drawings

Figure 1: Figure 1 is a schematic cross-sectional view showing the sealing structure of the embodiment of the present invention.

Fig. 2: Fig. 2 is a partially cut-away sectional view of the gasket of the embodiment of the present invention.

Fig. 3: Fig. 3 is a schematic cross-sectional view showing the shape of the gasket of the embodiment of the present invention when it is formed.

Figure 4: Figure 4 is a schematic cross-sectional view showing the appearance of the gasket of the embodiment of the present invention when it is demolded.

Fig. 5: Fig. 5 is a schematic cross-sectional view showing the appearance of the gasket of the embodiment of the present invention when it is recovered from the mold.

Fig. 6: Fig. 6 is a schematic cross-sectional view showing a sealing structure of a modified example of the present invention.

Fig. 7: Fig. 7 is a schematic sectional view showing a sealing structure of a prior art example.

Explanation of reference signs

100 washers

110 Gasket body part

120 1st annular convex part

121 Surface

130 Second annular convex part

131 Surface

140 end face

150 end faces

200 inner tube

210 outer peripheral surface

220 ring protrusion

221 side

300 outer tube

310 inner peripheral surface

320 ring protrusion

321 side

400 shell

410 end face

420 holes

510 1st mold

511 Groove

520 Second mold

521 Groove

522 Outer surface

530 3rd mold

531 inner peripheral surface

550 push rod

Detailed ways

The implementation of the utility model will be described in detail below with reference to the drawings and according to the examples. However, unless otherwise specified, the dimensions, materials, shapes and relative arrangements of the structural components described in the embodiments are not intended to limit the scope of the present invention.

(example)

Referring to Fig. 1 to Fig. 5, the sealing structure and the manufacturing method of the gasket according to the embodiment of the present invention will be described. In this embodiment, the sealing structure at the pipe joint portion of the device to which the double pipe is attached will be described as an example.

<Sealing structure>

Referring to Fig. 1, the sealing structure of the embodiment of the present invention will be described. Fig. 1 is a schematic sectional view showing a sealing structure of an embodiment of the present invention. In FIG. 1 , for convenience of description, a cross-sectional view of the washer 100 under no external force is shown. In addition, in FIG. 1, the inner tube 200 which is a 1st member, the outer tube 300 which is a 2nd member, and the housing 400 of the device which are a 3rd member show the sectional drawing of the assembled state by dotted lines.

The sealing structure of the present embodiment includes the above-mentioned inner tube 200, outer tube 300, and housing 400, and a gasket 100 made of rubber-like elastic body that is closely attached to the above-mentioned three components.

The inner tube 200 is inserted into the tube of the outer tube 300, and the outer tube 300 and the housing 400 are fixed with fasteners such as bolts. The inner tube 200 is positioned and fixed by the fastening force generated by the gasket 100 and the like. In a state where the inner tube 200 and the outer tube 300 are assembled in the casing 400 , the outer peripheral surface 210 of the inner tube 200 and the inner peripheral surface 310 of the outer tube 300 are arranged concentrically. The end face 410 of the housing 400 is opposite the end face of the inner tube 200 and the end face of the outer tube 300 . The housing 400 is provided with a hole 420 forming a fluid passage, and the inner tube 200 and the outer tube 300 are mounted on the housing 400 so that the hole 420 communicates with the inside of the inner tube 200 .

The inner tube 200 is provided with an annular protrusion (first annular protrusion) 220 protruding radially outward from the outer peripheral surface side. Here, the axial distance from the end surface 410 of the housing 400 to the annular protrusion 220 is set to be larger than the radial dimension of the annular gap between the outer peripheral surface 210 of the inner tube 200 and the inner peripheral surface 310 of the outer tube 300 . According to the above structure, the cross-section is elongated and substantially rectangular, formed by the planar side surface 221 of the annular protrusion 220, the end surface 410 of the housing 400, the outer peripheral surface 210 of the inner tube 200, and the inner peripheral surface 310 of the outer tube 300. annular space. A gasket 100 is installed in this annular space.

<washer>

The gasket 100 of this embodiment will be further described in detail with reference to FIG. 1 and FIG. 2 .

The gasket 100 includes: a cylindrical gasket body portion 110 , a first annular protrusion 120 provided on the inner peripheral surface side of the gasket body portion 110 , and a second annular convex portion 120 provided on the outer peripheral surface side of the gasket body portion 110 . Section 130. The first annular convex portion 120 and the second annular convex portion 130 are provided near the center in the axial direction. The gasket 100 of the present embodiment forms a symmetrical shape with respect to the center plane in the axial direction. Therefore, there is no need to pay attention to the direction in which the gasket 100 is installed. In the gasket body portion 110 , the dimension in the axial direction is larger than the thickness in the radial direction. For example, the radial thickness is set to be 2 to 3 mm, and the dimension in the axial direction is set to be about 10 to 11 mm.

Here, one end surface 140 of the gasket body portion 110 is in close contact with the end surface 410 of the housing 400 , and the other end surface 150 is in close contact with the planar side surface 221 of the annular protrusion 220 . The first annular convex portion 120 is in close contact with the outer peripheral surface 210 of the inner tube 200 , and the second annular convex portion 130 is in close contact with the inner peripheral surface 310 of the outer tube 300 .

In addition, in a state where no external force acts on the gasket 100, the distance from one end surface 140 of the gasket body 110 to the other end surface 150 is set to be greater than the distance from the The axial distance from the end surface 410 of the housing 400 to the annular protrusion 220 . In addition, in a state where no external force acts on the gasket 100, the inner diameter of the gasket main body 110 is larger than the outer diameter of the outer peripheral surface 210 of the inner tube 200, and the inner diameter of the front end of the first annular convex portion 120 is smaller than the outer peripheral surface 210 of the inner tube 200. The outer diameter of the gasket body 110 is smaller than the inner diameter of the inner peripheral surface 310 of the outer tube 300 , and the outer diameter of the front end of the second annular protrusion 130 is larger than the inner diameter of the inner peripheral surface 310 of the outer tube 300 .

The radially outward protrusion amount of the second annular protrusion 130 is set larger than the radially inner protrusion amount of the first annular protrusion 120 . When the inner diameter of the gasket body 110 is set to be about 11mm and the outer diameter is about 14mm, the protrusion amount of the first annular protrusion 120 is set to be about 0.1 mm to 0.5 mm, and the protrusion amount of the second annular protrusion 130 It is about 0.2 mm to 1.5 mm.

The front end portion of the first annular protrusion 120 is a curved surface with an arc-shaped cross section and bulges inward, and both sides of the front end portion are curved surfaces 121 with an arc-shaped cross-section and concave outward. Moreover, the curved surface of the front end is smoothly connected with the curved surfaces 121 on both sides thereof. The radius of curvature of the section of the curved surface 121 on both sides of the front end portion is set to be relatively large. For example, the radius of curvature is set to be about 1mm.

Similarly, for the second annular protrusion 130 , the front end portion is a curved surface with an arc-shaped cross section and bulges outward, and both sides of the front end portion are curved surfaces 131 with an arc-shaped cross-section and concave inward. Moreover, the curved surface of the front end is smoothly connected with the curved surfaces 131 on both sides thereof. The radius of curvature of the section of the curved surface 131 on both sides of the front end portion is set to be relatively large. For example, the radius of curvature is set to be about 2 mm.

<Advantages of the sealing structure of the present embodiment>

As described above, according to the sealing structure of the present embodiment, in the cylindrical gasket body portion 110 , the dimension in the axial direction is larger than the thickness in the radial direction. Therefore, the washer body portion 110 is easily compressed in the axial direction.

Here, in the case of this embodiment, since the outer tube 300 and the housing 400 are fixed by fasteners such as bolts, they are in close contact with each other. However, since the inner tube 200 is positioned only by the fastening force generated by the gasket 100 or the like, a gap S is generated between the inner tube 200 and the housing 400 .

However, in this embodiment, as described above, since the gasket body portion 110 is easily compressed in the axial direction, even when the gap S becomes large, it is possible to stably seal the end surface 410 of the housing 400 and the annular protrusion. The gap between the sides 221 of 220.

In addition, by making the first annular convex portion 120 of the gasket 100 contact the outer peripheral surface 210 of the inner tube 200, and the second annular convex portion 130 contact the inner peripheral surface 310 of the outer tube 300, the inner tube 200 and the outer tube are sealed. 300 between annular gaps. Here, in the state where no external force acts on the washer 100, the inner diameter of the washer main body 110 is set to be larger than the outer diameter of the outer peripheral surface 210 of the inner pipe 200, and the inner diameter of the front end of the first annular convex portion 120 is smaller than the outer peripheral surface 210 of the inner pipe 200. , and the outer diameter of the washer body part 110 is set to be smaller than the inner diameter of the inner peripheral surface 310 of the outer tube 300, and the outer diameter of the front end of the second annular protrusion 130 is larger than the inner diameter of the inner peripheral surface 310 of the outer tube 300. As a result, since only the parts of the first annular protrusion 120 and the second annular protrusion 130 are compressed to be in close contact with the inner tube 200 and the outer tube 300 , it is possible to fill the space where the gasket 100 is installed with the gasket 100 . rate is suppressed very low. Therefore, the load at the time of attaching the gasket 100 can be kept low. In addition, forced deformation of the gasket 100 can be suppressed. Thereby, sealing performance can be exhibited stably.

<Manufacturing method of gasket>

A method of manufacturing the gasket 100 of this embodiment will be described with reference to FIGS. 3 to 5 . The gasket 100 of the present embodiment is manufactured based on a molding process of injection molding.

Fig. 3 is a schematic cross-sectional view showing a state during vulcanization molding in the molding step. In the forming process, the mold is set so that the central axis of the formed gasket 100 is in the vertical direction.

The mold includes a first mold 510 , a second mold 520 and a third mold 530 . The role of the first die 510 is to form at least the vertically upper end surface portion (one end surface 140 portion) of the gasket 100 . The annular groove portion 511 in the first die 510 forms at least an end surface portion on the vertically upper side of the gasket 100 . The role of the second die 520 is to form at least the vertically lower end surface portion (the other end surface 150 portion) of the gasket 100 and the inner peripheral surface portion including the first annular protrusion 120 of the gasket 100 . The annular groove portion 521 of the second die 520 forms at least a vertically lower end surface portion of the gasket 100 . In addition, the outer peripheral surface 522 of the substantially cylindrical portion of the second die 520 forms at least the inner peripheral surface portion including the first annular convex portion 120 of the gasket 100 . The role of the third die 530 is to form at least the outer peripheral surface portion including the second annular convex portion 130 of the gasket 100 . The inner peripheral surface 531 of the third die 530 forms at least the outer peripheral surface portion including the second annular convex portion 130 of the gasket 100 .

In the demolding process, as shown in FIG. 4 , the first mold 510 is moved upward, and the second mold 520 is moved downward. Here, as described above, in the gasket 100 , the radially outward protrusion amount of the second annular protrusion 130 is set to be larger than the radially inner protrusion amount of the first annular protrusion 120 . Therefore, the molded gasket 100 is left and held in the third mold 530 by the fitting force of the second annular convex portion 130 and the third mold 530 .

Here, the first annular convex portion 120 partially forms a so-called undercut. However, as described above, in the first annular convex portion 120, the front end portion formed of a curved surface and the curved surfaces 121 on both sides thereof are smoothly connected. The radius of curvature of the section of the curved surface 121 on both sides of the front end portion is set to be relatively large. Therefore, the second die 520 can be moved downward without damaging the first annular protrusion 120 .

Then, as shown in FIG. 5 , the push rod 600 as a push member is moved in the P direction to push the gasket 100 , whereby the gasket 100 can be automatically collected by dropping the gasket 100 from the third mold 530 . Here, as described above, in the second annular convex portion 130, the front end portion formed of a curved surface and the curved surfaces 131 on both sides thereof are smoothly connected. The radius of curvature of the section of the curved surface 131 on both sides of the front end portion is set to be relatively large. Therefore, the gasket 100 can be pushed down without damaging the second annular protrusion 130 .

By employing the above manufacturing method, the gasket 100 can be manufactured by an automatic molding machine.

(modified example)

In the above embodiment, the structure in which the annular protrusion 220 is provided on the inner tube 200 as the first member and the other end surface 150 of the gasket 100 is brought into close contact with the annular protrusion 220 has been described. However, it is also possible to adopt a configuration in which an annular protrusion is provided on the outer tube 300 as the second member, and the other end surface 150 of the gasket 100 is brought into close contact with the annular protrusion. Referring to FIG. 6 , a modified example of the sealing structure of the above-mentioned embodiment of the present invention will be briefly described. Fig. 6 is a schematic sectional view showing a sealing structure of a modified example of the present invention. In FIG. 6 , the same reference numerals are used for the same structural parts as those of the above-mentioned embodiment, and description thereof will be omitted.

In this modified example, the annular protrusion is not provided on the inner tube 200 as the first member. Instead, an annular protrusion (second annular protrusion) 320 protruding radially inward from the inner peripheral surface side of the outer tube 300 as the second member is provided. According to this structure, the cross section is surrounded by the planar side 321 of the annular protrusion 320, the end surface 410 of the housing 400, the outer peripheral surface 210 of the inner tube 200, and the inner peripheral surface 310 of the outer tube 300. Rectangular ring space. And, a gasket 100 is installed in the annular space. Therefore, the same effects as in the case of the above-described embodiment can be obtained.

(other)

In the above-mentioned embodiment, the case where the gasket 100 is used in an environment where the outer tube 300 and the housing 400 are fixed by fasteners such as bolts and are in close contact with each other, and a gap S is generated between the inner tube 200 and the housing 400 is described. . However, the gasket 100 can also be applied in an environment where the inner tube 200 and the housing 400 are fixed by fasteners such as bolts and are in close contact with each other, and a gap S is formed between the outer tube 300 and the housing 400 .

Claims (7)

1. a sealing configuration, is characterized in that, comprising:

There are the 1st parts of outer circumferential face;

There are the 2nd parts with the inner peripheral surface of described outer circumferential face concentric arrangement;

There are the 3rd parts with the end face of the 1st parts and the opposed end face of end face of the 2nd parts; And

By being close to the 1st parts, the 2nd parts and the 3rd parts respectively, and seal respectively the above-mentioned all parts packing ring of the rubber-like elasticity system in gap each other, wherein,

Be provided with 1st cyclic lug outstanding from the outer circumferential face side direction radial outside of the 1st parts, or from the 2nd outstanding cyclic lug of the inner peripheral surface side direction radially inner side of the 2nd parts, and setting is greater than the radial dimension of the annular gap between the outer circumferential face of the 1st parts and the inner peripheral surface of the 2nd parts from described end face to the 1 cyclic lug of the 3rd parts or the axial distance of the 2nd cyclic lug, and

Described packing ring has:

Columnar packing ring main body portion, an one end face is close to the described end face of the 3rd parts, and another end face is close to the plane side of the 1st cyclic lug or the 2nd cyclic lug;

The 1st annular convex, it is arranged at the inner peripheral surface side of this packing ring main body portion, is close to the outer circumferential face of the 1st parts; And

The 2nd annular convex, it is arranged at the outer circumferential face side of this packing ring main body portion, is close to the inner peripheral surface of the 2nd parts,

Under not to the state of described packing ring external force action, distance from an end face of described packing ring main body portion to another end face, under state together with ratio arrives the 1st parts, the 2nd parts and the 3rd assembling parts, large from described end face to the 1 cyclic lug of the 3rd parts or the axial distance of the 2nd cyclic lug, and

Under not to the state of described packing ring external force action, the internal diameter of described packing ring main body portion is greater than the external diameter of the 1st parts outer circumferential face, the front inner diameter of the 1st annular convex is less than the external diameter of the 1st parts outer circumferential face, and the external diameter of described packing ring main body portion is less than the internal diameter of the 2nd parts inner peripheral surface, the front end external diameter of the 2nd annular convex is greater than the internal diameter of the 2nd parts inner peripheral surface.

2. sealing configuration as claimed in claim 1, is characterized in that, the radial thickness of described packing ring main body portion is 2～3mm, and axial dimension is 10～11mm.

3. sealing configuration as claimed in claim 1, is characterized in that, described the 2nd annular convex, to the overhang of radial outside, is greater than the overhang of described the 1st annular convex to radially inner side.

4. sealing configuration as claimed in claim 1, it is characterized in that, the fore-end of described the 1st annular convex is made up of the curved surface of the curved bulging to the inside of section, the both sides of the fore-end of described the 1st annular convex are made up of the curved curved surface of depression laterally of section, and the curved surface of the fore-end both sides of the curved surface of the fore-end of described the 1st annular convex and described the 1st annular convex links up smoothly.

5. sealing configuration as claimed in claim 4, is characterized in that, the profile curvature radius of fore-end two N-Side surfs of described the 1st annular convex is 1mm.

6. sealing configuration as claimed in claim 1, it is characterized in that, the fore-end of described the 2nd annular convex by section curved, the curved surface of bulging to the inside forms, the both sides of the fore-end of described the 2nd annular convex by section curved, the curved surface of depression forms laterally, the smooth connection of the curved surface of the fore-end both sides of the curved surface of the fore-end of described the 2nd annular convex and described the 2nd annular convex.

7. sealing configuration as claimed in claim 6, is characterized in that, the profile curvature radius of fore-end two N-Side surfs of described the 2nd annular convex is 2mm.