JP2002357290A - Joint structure - Google Patents

Abstract

(57) Abstract: There is provided a joint structure capable of suppressing entry of fluid into an annular groove for accommodating an annular seal member. An annular abutting surface 1 abuts with each other.
An annular seal member provided along the pair of joints 1 and 2 having the joints 3 and 22 and the mating surface 13 of the one joint 1 and elastically deforming and tightly fitting to the mating surface 22 of the other joint 2 when the joints are connected. O-ring) 16 and the annular butting surface 1 of one of the joints 1.
3 is provided with an annular groove 14 to which the sealing member 16 is attached with a part thereof protruding outward. The annular groove 14 has a cross-sectional shape in contact with the entire area of the groove housing portion 16a of the sealing member 16, The deformed seal member 16 is configured to escape in a direction along the abutting surface within the gap 30 between the abutting surfaces 13 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure suitably used for connecting passages for fluids such as foods and medicines requiring cleanliness.

[0002]

2. Description of the Related Art Sanitary joints are known as the joints described above. This joint has a female joint 101 having an internal fluid passage 103, as shown in FIGS.
And a male joint 102 having an internal fluid passage 104, wherein the internal fluid passages 103 and 104 are connected to different fluid passages, respectively. The female joint 101 has a butt surface 101a at its lower end, and the male joint 102 has a butt surface 102a at its upper end.
When the inner fluid passages 103 and 104 are separated from each other by abutting the inner fluid passages 103 and 104 on the same axis, the inner fluid passages 103 and 104 are connected to each other. It is cut off and cut off (the state shown in FIG. 10).

An O-ring 105 serving as an annular sealing member is provided in the abutting surface 101a so as to be housed in an annular groove 106. The O-ring 105 seals between the abutting surfaces 101a and 102a. . Specifically, the O-ring 105 is provided so that a part thereof protrudes from the abutting surface 101a toward the abutting surface 102a, and when the joint is connected, the O-ring 105 is in close contact with the mating abutting surface 102a while being elastically deformed.

[0004]

When connecting the female joint 101 and the male joint 102, the bottom of the annular groove 106 is largely widened as a place where the elastically deformed O-ring 105 escapes. Are formed in a so-called dovetail groove having a cross-sectional area of the O-ring or more, that is, a filling rate of 100% or less.

Therefore, each time the female joint 101 and the male joint 102 are attached and detached, the O-ring 105 repeatedly compresses and restores. It will slide with respect to both edges. As a result, the inflow due to the capillary phenomenon and the two joints 1
Fluid may enter the bottom of the dovetail groove and cause corrosion or the like due to inflow or the like due to deterioration of sealing performance due to repeated attachment / detachment of 01 and 102.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and has as its object to provide a joint structure capable of suppressing the entry of fluid into an annular groove for accommodating an annular seal member. Aim.

[0007]

SUMMARY OF THE INVENTION A joint structure according to the present invention is provided with a pair of joints each having an annular butting surface butted against each other, and provided along the butting surface of one joint. An annular structure having an annular seal member that elastically deforms and comes into close contact with the abutting surface, wherein the annular abutting surface of the one joint has an annular groove to which the seal member is attached by projecting a part thereof outward. The annular groove is formed to have a sectional area smaller than the sectional area of the seal member, and when the joint is connected, the annular groove and the groove accommodating portion of the seal member are elastically deformed without relatively moving. It is characterized in that the seal member is configured to escape in a direction along the butting surface within a gap between the butting surfaces.

In the joint structure of the present invention, the seal member is housed in the annular groove in a state where a preload (preload) is applied, and when the joint is connected, the elastically deformed seal member is brought into contact with the abutting surfaces. Because the joint escapes in the direction along the butt surface in the gap, even if the two joints are connected and disconnected, the seal member does not slide on both edges of the annular groove,
Fluid inflow due to deterioration in sealing performance can be prevented, and in addition, since there is no gap between the groove storage portion of the seal member and the annular groove, fluid inflow due to capillary action can be prevented, so that fluid can be prevented from entering the annular groove. It is possible to prevent the occurrence of corrosion and the like.

Here, as the annular sealing member, a member having a rectangular or circular cross section can be used.

[0010] In the joint structure of the present invention, the annular groove has a first concave portion forming a part thereof, and a joint body attached to the joint body. It is possible to adopt a configuration in which the second concave portion to be formed is formed by the mounting member in which the second concave portion is formed.

[0011] In this configuration, even if the annular groove has a cross-sectional shape in which the groove opening is narrow and the annular seal member is difficult to be mounted in the annular groove, the annular groove is formed with the mounting member removed from the joint body. By inserting the seal member and then attaching the attachment member to the joint body, the seal member can be attached to the annular groove having a narrow groove opening without any trouble. In addition, in the case of this configuration, not only a soft seal member entirely made of rubber, but also a seal member having high hardness that is hard to be pushed through the groove opening, for example, a seal in which the inside is rubber and the outside is coated with Teflon (registered trademark) Even a member or the like can be easily attached to the annular groove.

In the joint structure according to the present invention, the seal member is an O-ring, and the cross-sectional shape of the annular groove is substantially arc-shaped, and at least a radius of curvature of both edges of the groove is a depth inside the groove. Can be configured to be shorter than the radius of curvature.

In this configuration, the radius of curvature at both ends of the annular groove is shorter than the radius of curvature at the inner part of the groove, and the O-ring is narrowed down at the groove opening. And the inflow of the fluid due to the decrease of the pressure becomes less likely to occur, and the inflow of the fluid into the annular groove can be further suppressed.

Further, in the joint structure of the present invention, the sealing member has a sealing member having a rectangular cross section, and the annular groove is formed so as to expose one of four corners of the sealing member to the outside. A part of the mating surface of the joint opposite to the one joint to which the seal member is attached is formed so as to protrude outward, and the protruding portion corresponds to the exposed portion of the seal member. It can be configured to be in contact.

In this configuration, even if an annular seal member having a rectangular cross section is used, it is possible to suppress fluid from entering the annular groove.

In the present invention, the load in the direction in which the joints abut each other may be received only by the seal member. If a configuration is adopted in which a gap of a certain dimension is secured between the abutting surfaces by the abutment of these abutting portions, the amount of deformation of the sealing member can be reliably defined, and the excessive pressing force of the sealing member can be reduced. Receiving and pushing out can be prevented.

[0017]

Embodiments of the present invention will be specifically described below with reference to the drawings.

(First Embodiment) FIG. 1 is a front sectional view showing a state in which a pair of sanitary joints is connected to which the joint structure according to the first embodiment is applied, and FIG. 2 is a pair of sanitary joints. 3 is a front sectional view showing a male joint of the pair of sanitary joints, and FIG. 4 is an enlarged front sectional view showing a portion A in FIG.

The pair of sanitary joints is, for example, provided between a production tank of a paint production facility and another facility, and has a female joint 1 and a male joint 2.

As shown in FIGS. 1 and 2, the female joint 1 has a cylindrical female joint body 10 having an internal fluid passage 3 therein. Is formed in a stepped state on the inner side of the upper part of the hanging cylindrical portion 11, and the stepped portion functions as an annular abutting surface 13. An annular groove 14 is formed along the abutting surface 13, and an O-ring 16 having a circular cross section made of an elastic material is housed in the annular groove 14 with its lower end protruding outward. .

The annular groove 14 is formed by screwing an annular mounting member 15 to the female joint body 10. Specifically, as shown in FIG. 4, an arc-shaped first cross-section is formed on the butting surface 13 of the female joint body 10.
It is composed of a concave portion 10a and a second concave portion 15a formed at the lower end of the inner peripheral surface of the mounting member 15 and having an arc-shaped cross section continuous with the first concave portion 10a.

The cross-sectional shape of the annular groove 14 has two edges, that is, an end 10b on the inner peripheral side of the annular groove 14 of both ends 10b and 10c of the first concave 10a, and a second concave 15
Except for the lower end 15b of the a, the inner part 10d of the groove is formed in an arc shape having the same radius of curvature as the radius of the O-ring 16, and the radius of curvature of the end 10b and the radius of curvature of the lower end 15b are O-ring. It is formed so as to become gradually lower than the radius of 16. Also, the groove opening 14 of the annular groove 14
The width dimension W of a is shorter than the diameter of the O-ring 16 by a predetermined dimension in order to prevent the O-ring 16 from being elastically deformed.

The O-ring 16 is provided in the annular groove 14.
Are attached to the inside of the first recess 10a,
The O-ring 16 is housed in a pre-loaded state by screwing, and the entire area of the groove housing portion 16a of the O-ring 16 is
4, and is narrowed down at the groove opening 14a. The end 10b and the lower end 15b which are both edges of the annular groove 14 for narrowing the O-ring 16
Can be of any length.

As shown in FIG. 3, the male joint 2 has a bottomed cylindrical male joint body 20 having an internal fluid passage 4 therein.
A cylindrical fluid passage connecting portion 2 is provided on the peripheral surface of the male joint body 20.
1 is mounted so as to communicate with the internal fluid passage 4. The upper end surface of the male joint 2 functions as a butt surface 22 that butt against the butt surface 13.

The male joint 2 having such a configuration is fixed on the bottom side, and when the female joint 1 is approached from the upper side on the same axis, the two joints 1 and 2 are connected to each other. Fixed by means. With this connection, the butting surface 13 of the female joint 1 and the butting surface 22 of the male joint 2 are butted, and after the protruding portion of the O-ring 16 from the annular groove 14 comes into contact with the butting surface 22, FIG. In FIG. 4, it adheres while elastically deforming from the state shown by the broken line to the state shown by the solid line. At this time, the entire area of the groove housing portion 16a of the O-ring 16 is in contact with the annular groove 14 without any gap, so that the elastically deformed portion of the O-ring 16 is along the abutting surface between the two abutting surfaces 13 and 22. In which direction a gap 30 is formed between the butting surfaces 13 and 22, and the gap 30 is closed. Thereby, the internal fluid passages 3 and 4 are brought into a communicating state.

On the other hand, contrary to the above, the female joint 1 and the male joint 2
Is separated, the internal fluid passages 3 and 4 are separated.

Therefore, in the first embodiment, the annular groove 14 is in contact with the entire area of the groove accommodating portion 16a of the O-ring 16, and the elastically deformed portion of the O-ring 16 is located between the abutting surfaces 13 and 22. Is formed so as to escape in the direction along the abutting surface, so that even if the joints 1 and 2 are connected and disconnected, the O-ring 16 is attached to both edges of the annular groove 14, that is, the end 10b and the lower end 15b. Therefore, it is possible to prevent the fluid from flowing in due to the deterioration of the sealing performance without sliding. In addition, since there is no gap between the groove accommodating portion 16a of the O-ring 16 and the annular groove 14, fluid can be prevented from flowing into the annular groove 14 by capillary action. Etc. can be prevented.

Further, in the present embodiment, the radius of curvature of both edges 10b and 15b of the annular groove 14 is shorter than the radius of the O-ring 16 for narrowing down. And the inflow of the fluid due to the decrease of the flow rate can be made harder to occur, and the inflow of the fluid into the annular groove 14 can be further suppressed. Further, since the width dimension W of the groove opening 14a is shorter than the diameter of the O-ring 16, the O-ring 16 can be prevented from falling off from the groove opening 14a.

Further, in the present embodiment, the annular groove 14 is formed by the female joint body 10 and the mounting member 15 as described above, so that the O-ring 16 can be easily mounted. . That is, as described above, O
Since the width W of the groove opening 14a is shorter than the diameter of the O-ring 16 by a predetermined size in order to prevent the ring 16 from dropping off, especially when the width W is small, the width W is directly from the groove opening 14a. It is difficult to fit the O-ring 16 into the groove 14. However, in the case of the present embodiment, when the mounting member 15 is removed from the female joint main body 10, the groove opening in only the female joint main body 10 is positioned between the both ends 10b and 10c of the first concave portion 10a, that is, the annular groove. Since the position is closer to the axis 14, the width W is larger than the width W. Therefore, by inserting the O-ring 16 into the annular groove 14 using the groove opening of the female joint body 10 larger than the width dimension W and attaching the mounting member 15 to the joint body 10, the annular groove 14 having a narrow groove opening 14 a is formed. The O-ring 16 can be mounted without any trouble. With this configuration,
Not only a soft O-ring made entirely of rubber, but also an O-ring having high hardness that is hard to be pushed through the groove opening 14a, for example, an O-ring whose inside is rubber and whose outside is coated with Teflon, can be easily inserted into the annular groove 14. It can be conveniently mounted.

In the above-described embodiment, the inner part 10 in the groove is used.
The radius of d is the same size as the radius of the O-ring 16, but may be slightly smaller than the radius of the O-ring 16.
In such a case, there is an advantage that the inflow of the fluid can be further prevented.

(Second Embodiment) FIG. 5 is a front sectional view showing a second embodiment of the present invention.

In the second embodiment, a plurality of columnar gap holding projections 31 for regulating the size of the gap 30 are provided on the butting surface 22 of the joint 2.
Are formed along the line. The projection 31 is made of a material that is difficult to deform, such as a metal, and has a height dimension of O
It is preferable that the ring 16 be dimensioned so that it can be elastically deformed and restored, and the gap 30 can be blocked by the O-ring 16 regardless of the internal pressure received from the fluid.

According to the second embodiment, the gap 30 can be secured between the butting surfaces 13 and 22 by the elastic deformation of the O-ring 16 and the gap 30 can be cut off. effective. That is, the amount of elastic deformation of the O-ring 16 can be reliably defined, and when the O-ring 16 receives an excessive pressing force,
And 22 can be prevented from being pushed or broken.

The projection 31 may be provided outside the internal passage 3. Further, in the present embodiment, the columnar protrusion 31 is provided, but the present invention is not limited to this, and the protrusion 31 may be formed in an annular shape concentric with the butting surface 22. In the present embodiment, the projection 31 is provided on the joint 2 side, but may be provided on the joint 1 side to which the O-ring 16 is attached, or may be provided on both the joints 1 and 2. Alternatively, an outward abutting portion is provided at a portion different from the abutting surface, for example, at a position where the lower end of the hanging tube portion 11 is located on the male joint main body 20 side during connection, and the abutting portion and the lower end of the hanging tube portion 11 are provided. May be in contact with each other.

(Third Embodiment) FIG. 6 is a front sectional view showing a female joint to which a joint structure according to a third embodiment of the present invention is applied, and FIG. 7 is a front sectional view showing a mating male joint. FIG. 8 is a front sectional view showing a portion B in FIG. 6 in an enlarged manner.

In the third embodiment, a gap is formed and cut off by a seal member having a rectangular cross section. A specific configuration will be described below.

As shown in FIG. 6, the female joint 1A has a female joint body 10A and a mounting member 15A screwed to the female joint body 10A, and is surrounded by the female joint body 10A and the mounting member 15A. An annular groove 40 is formed, and an annular seal member 41 made of an elastic material and having a rectangular cross section is attached to the annular groove 40.

As shown in FIG. 8, the annular groove 40 includes a lower end surface 42 of the female joint body 10A and a first concave portion of the hanging portion 43, a side surface 44 of the mounting member 15A and an eave portion 45.
The dimension between the lower end face 42 and the eaves section 45 is slightly shorter than the thickness dimension of the annular seal member 41, and between the hanging section 43 and the side face 44. Is slightly shorter than the width of the annular seal member 41.

The portion (groove housing portion) of the annular seal member 41 housed in the annular groove 40 is compressed by the annular groove 40, makes contact with the annular groove 40 without any gap, and has the eaves 45 provided with the annular seal member 41. Is prevented from falling off.

From the annular groove 40, the annular sealing member 4
The inner peripheral-side corner portion 41a of 1 is exposed, and the butted surface 50 of the male joint 2A is brought into contact with the exposed corner-portion 41a. The abutting surface 46 of the female joint body 10A is formed by a lower end surface 42 and a portion 4 near the corner of the annular seal member 41 attached to the lower side.
1a and the lower surface of the mounting member 15A.

As shown in FIG. 7, the mating surface 50 of the male joint 2A has an annular protrusion 51 formed on the inner peripheral side, and when the protrusion 51 is connected, the vicinity of the exposed corner is reduced. Press 41a. The elastically deformed portion of the annular seal member 41 due to this pressing escapes from the state shown by the solid line in FIG. 8 to the direction along the abutting surface between the two abutting surfaces 46 and 50 as shown by the two-dot chain line.

Therefore, in the third embodiment, similarly to the first embodiment, the annular groove 40 comes into contact with the entire groove housing portion of the annular seal member 41, and the elastically deformed portion of the annular seal member 41 is removed. Butts 46 and 50
Between the two joints 1A and 2A, the annular seal member 41 slides on both edges of the annular groove 40 even when the joints 1A and 2A are connected and disconnected. Is suppressed, and fluid inflow due to a decrease in sealing performance can be prevented. In addition, the annular sealing member 41
Since there is no gap between the groove storage portion and the annular groove 40, the inflow of fluid due to capillary action can be prevented.
It is possible to suppress the intrusion of the fluid into the inside, and it is possible to prevent the occurrence of corrosion and the like.

The annular groove 40 is provided in the female joint body 10A.
And the attachment member 15A attached thereto, the attachment of the annular seal member 41 is excellent.

In the third embodiment, the second
Similar to the embodiment, it is preferable to provide a projection for forming a gap on the abutting surface.

In the first to third embodiments described above, the annular seal member is attached to the female joint side. However, the present invention is not limited to this, and the configuration in which the annular seal member is attached to the male joint side is provided. Needless to say, it may be.

Further, in the first to third embodiments described above, one attachment member is attached to the joint body to form an annular groove. However, the present invention is not limited to this, and the present invention is not limited to this. Alternatively, two or more attachment members may be attached to form an annular groove. For example, mounting members may be mounted on both sides of the concave portion formed in the joint body, or two or more mounting members may be mounted on one side of the concave portion formed in the joint body.

The present invention can be widely applied not only to sanitary joints but also to various other joints.

[0048]

As described above in detail, in the case of the present invention, the sealing member is housed in the annular groove in a state where it is compressed and preloaded, and when the joint is connected, the sealing member is elastically deformed. Since the member escapes in the direction along the abutting surface within the gap between the abutting surfaces, the sealing member is prevented from sliding with respect to both edges of the annular groove even when the two joints are connected and disconnected, and the sliding is performed. Fluid can be prevented from entering between the seal member and the annular groove due to movement, and since it does not slide, fluid inflow due to deterioration in sealing performance can be prevented. In addition, the groove storage portion of the seal member and the annular groove Since there is no gap between them, the inflow of fluid due to the capillary phenomenon can be prevented, so that the fluid can be prevented from entering the annular groove, and the occurrence of corrosion and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a front cross-sectional view showing a state in which a pair of sanitary joints to which a joint structure according to a first embodiment is applied is connected.

FIG. 2 is a front sectional view showing a female joint of the sanitary joint shown in FIG. 1;

3 is a front sectional view showing a male joint of the sanitary joint shown in FIG. 1;

FIG. 4 is an enlarged front sectional view showing a portion A in FIG. 1;

FIG. 5 is a front sectional view showing a second embodiment of the present invention.

FIG. 6 is a front sectional view showing a female joint for sanitary to which a joint structure according to a third embodiment of the present invention is applied.

FIG. 7 is a front sectional view showing a male sanitary joint on the other side of the female joint shown in FIG. 6;

FIG. 8 is an enlarged front sectional view showing a portion B in FIG. 6;

FIG. 9 is a front sectional view showing a connected state of a conventional sanitary joint.

FIG. 10 is a front sectional view showing a state in which a conventional sanitary joint is cut off.

[Explanation of symbols]

 1, 1A female joint 2, 2A male joint 10, 10A female joint main body 13, 22 butting surface 14, 40 annular groove 15, 15A mounting member 16 O-ring (annular sealing member) 30 gap 31 protrusion 41 annular sealing member

Claims (5)

[Claims] 1. A pair of joints each having an annular butting surface butted with each other, and an annular seal provided along the butting surface of one of the joints and elastically deforming and closely contacting the butting surface of the other joint when the joints are connected. A joint structure provided with a member, wherein the annular butt surface of the one joint is provided with an annular groove to which the seal member is attached by projecting a part of the seal member outward, and the sectional area of the annular groove is The seal member is formed smaller than the cross-sectional area of the seal member, and the elastically deformed seal member abuts in the gap between the abutting surfaces without relatively moving the annular groove and the groove housing portion of the seal member when the joint is connected. A joint structure configured to escape in a direction along a plane. 2. A first groove constituting a part of the annular groove.
2. The joint body according to claim 1, wherein the joint body is formed with a recess, and the mounting member is attached to the joint body and has a second recess forming the remainder of the annular groove. Joint structure. 3. The sealing member is an O-ring, wherein the cross-sectional shape of the annular groove is substantially arc-shaped, and at least the radius of curvature of both edges of the groove is shorter than the radius of curvature of the inner portion of the groove. The joint structure according to claim 1 or 2, wherein: 4. A seal member having a rectangular cross section as the seal member, wherein the annular groove is formed so as to expose one of four corners of the seal member to the outside, and the seal member A part of the mating surface of the joint opposite to the one joint to which the one is attached is formed so as to protrude outward, and the protruding portion contacts an exposed portion of the seal member. Item 3. The joint structure according to item 1 or 2. 5. The two joints are provided with contact portions that come into contact with each other when these joints are connected, and a gap of a certain dimension is secured between the butted surfaces by the contact of these contact portions. The joint structure according to any one of claims 1 to 4, wherein