JPH08128572A - Packing attachment structure for pipe connection - Google Patents

Abstract

(57) [Summary] [Purpose] In a structure in which packing is attached to a connecting portion of a pipe, the attaching work can be easily performed, and the attaching work can be performed in a relatively narrow space, and the structure is simple. [Structure] A flange portion 9 is provided on the outer peripheral portion of the female-side pipe end portion 2, and an inclined cam 19 is formed around the flange portion 9. On the other hand, in the male side pipe end part 3 to be inserted into the female side pipe end part 2,
A push wheel 12 for pressing the packing 6 into the female tube end portion 2 is rotatably fitted on the outside. This push wheel 12 has one of the push wheels 12
An engagement protrusion 20 is provided that can be engaged with and disengaged from the tilt cam 19 by a turning operation within rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing mounting structure for a pipe connecting portion.

[0002]

2. Description of the Related Art Conventionally, in order to prevent water leakage at a connecting portion such as a drain pipe, a water leakage preventing structure as shown in FIG. 6 or 7 has been adopted. That is, in the one shown in FIG. 6 (hereinafter referred to as the first conventional example), the female side tube end portion 50 is integrally provided with the receiving portion 52 for accommodating the ring-shaped packing 51, and the male side tube is formed. A push ring 54 for pressing the packing is fitted on the end portion 53. Then, the packing 51 is fitted into the receiving portion 52 of the female-side pipe end portion 50, the male-side pipe end portion 53 is inserted into the female-side pipe end portion 50, and then the push ring 54 is pressed against the packing 51. The flange portion 55 provided on the receiving portion 52 and the push ring 54 are connected to each other by a plurality of bolts and nuts 56.

On the other hand, the one shown in FIG. 7 (hereinafter referred to as the second conventional example) is basically also a receiving portion 52 provided at the female side pipe end portion 50, a ring-shaped packing 51, and a male side. Although it has a push ring 54 fitted onto the pipe end portion 53, it is different from the first conventional example in that the receiving portion 52 and the push ring 54 are screwed to each other by a female screw and a male screw 57. Is different.

[0004]

In the first conventional example, since the tightening work (the loosening work in some cases) of the bolts and nuts 56 is troublesome, the pipe connecting work (the mounting work of the packing 51) is also required. Naturally, there was a drawback that it was troublesome and required a long time. Moreover, a working space (a swinging space such as a spanner) for tightening the bolts and nuts 56 is required on the outer peripheral portion of the pipe as a piping space for the drain pipe,
It was a waste of space.

Further, in the second conventional example, it is necessary to engrave a female screw or a male screw 57 having a diameter larger than the pipe diameter on the receiving portion 52 of the push ring 54 or the female side pipe end portion 50, which is difficult to process. In addition, there is a drawback that the manufacturing cost rises. The present invention has been made in view of the above circumstances, and the pipe connecting work (packing mounting work) can be performed easily and quickly, the piping space can be reduced, and the structure can be further simplified. An object of the present invention is to provide a packing mounting structure for a pipe connecting portion that can suppress an increase in manufacturing cost.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, in the present invention, in the structure in which the packing is attached to the pipe connecting portion between the female-side pipe end and the male-side pipe end, the packing-accommodating receiving portion provided on the female-side pipe end and the male-side pipe are provided. And a push wheel for pressing the packing, which is rotatably fitted to the end portion, and is provided on one of the receiving portion and the push wheel when the push wheel is rotated within one rotation. It is characterized in that the same number of inclined cams that can be engaged and disengaged around the tube axis are provided between at least two engaging pieces.

The inclined cam is formed around the flange portion by providing a flange portion projecting outward in the radial direction with respect to the opening peripheral portion of the receiving portion, and the engaging piece is provided with the pressing wheel. It is possible to employ a configuration in which the inner peripheral portion of the is projected inward in the radial direction. The inclined cam can be configured such that a reverse inclined portion that prevents the engaging piece from coming off is provided at a terminal end portion in a direction in which the engagement with the engaging piece is strengthened.

[0008]

[Operation] The push ring is externally fitted to the male side pipe end, the packing is fitted in the receiving part of the female side pipe end, and the male side pipe end is inserted into the female side pipe end. If the push wheel is rotated within one rotation while the push wheel is in contact with the push wheel, for example, the engagement piece provided on the push wheel engages with the inclined cam provided on the receiving portion around the pipe axis, The degree of engagement is gradually strengthened.

The engaging piece of the push wheel may be provided on the inner circumference side or the outer circumference side, and accordingly, the inner and outer circumferences of the inclined cam forming portion with respect to the receiving portion can be different. Further, the push wheel may be provided with an inclined cam and the receiving portion may be provided with an engaging piece. In this case also, the inner and outer peripheral positions of the inclined cam and the inner and outer peripheral positions of the engaging piece at the receiving portion are Each can be different.

With such a structure, the amount of turning operation of the push wheel may be small, and since the bolts and nuts are not used, the work is not troublesome. Of course, since the bolts and nuts are not used, the piping space can be reduced. Moreover, it is structurally simple, and it is possible to prevent the manufacturing cost from rising. In the inclined cam, if the reverse inclined portion is provided at the end portion in the direction in which the engagement with the engaging piece is strengthened, when the engaging piece is positioned on the reverse inclined portion, the operation of eagerly escaping the engaging piece As long as it is not, the engaging piece will not escape without permission.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a packing mounting structure according to the present invention, wherein 1 is a cast iron coupling having female tube ends 2 at both ends, and 3 is this It is a male tube end of a tube that can be inserted into the female tube end 2.

In the first embodiment, the female tube end portion 2 of the coupling 1 is provided with a receiving portion 8 capable of accommodating a cylindrical packing 6. A flange portion 9 that projects outward in the radial direction is provided on the peripheral portion of the opening of the receiving portion 8. A push ring 12 is rotatably fitted on the male side pipe end 3. The packing 6 is made of rubber, soft resin, soft metal, or the like, and the annular end 6a on the front side inserted into the receiving portion 8 is inclined so that the inner peripheral edge thereof is tapered. . In addition, an inclined step portion 8a corresponding to this inclination is formed at the inner rear side of the receiving portion 8. Therefore, when the packing 6 is pushed into the receiving portion 8 along the tube axis direction, the annular end 6a of the packing 6 is abutted against the inclined step portion 8a of the receiving portion 8 to reduce its diameter. The outer side of the male-side tube end portion 3 is closely attached to enhance the waterproof performance.

The push ring 12 includes an inner ring portion 13 and an outer ring portion 14.
And the two wheel portions 13 and 14 are integrally connected by the annular connecting portion 15. Inner ring 1
3 is fitted between the outer peripheral surface of the male-side pipe end portion 3 and the inner peripheral surface of the receiving portion 8 to press the packing 6 in the pipe axial direction. The outer ring portion 14 is formed in a size that fits into the flange portion 9 provided on the opening peripheral portion of the receiving portion 8 from the outer side in the circumferential direction.

As shown in FIG. 2, the flange portion 9 of the receiving portion 8 is provided with a plurality of notches 18 (three in the drawing) in an equidistant manner. Then, on the back side (circumferential surface) that passes through each of the cutouts 18, an inclined cam 19 starting from the cutout 18 is provided. On the other hand, in the push ring 12, the notch parts 18 are formed on the inner peripheral surface of the outer ring part 14.
The engaging piece 20 is provided so as to project inward in the radial direction at a position that can be matched with. In this embodiment, the engagement piece 20 is formed by press-fitting a pin material.

As shown in FIG. 1 (b), the inclined cam 19 is
When the push wheel 12 is rotated while the engagement piece 20 is fitted in the cutout portion 18, the engagement piece 20 is engaged with the periphery of the pipe axis, and the engagement degree is increased each time the degree of rotation is increased. It has a strong inclination. Of course, the engaging piece 20 can be disengaged by rotating the push wheel 12 in the opposite direction. In these cases, the amount by which the push wheel 12 is rotated is within one rotation (in this embodiment, since there are three inclined cams 19, it is about 1/3 rotation or less). Is very different from.

The inclined cam 19 is provided with a reverse inclined portion 22 at the end portion in the direction in which the engagement with the engagement piece 20 is strengthened.
Therefore, when the push wheel 12 is rotationally operated until the engagement piece 20 gets over the mountain top and reaches the reverse inclined portion 22, the push wheel 12 is reversely rotated eagerly. Unless the operation is performed, the engaging piece 20
Does not escape from the inclined cam 19 without permission.
A projection 23 for stopping the engagement piece 20 is provided at the terminal end of the reverse inclined portion 22.

Due to such a constitution, the male side pipe end portion 3
The push ring 12 is fitted on the outer side of the female tube end 8
The packing 6 is housed in the male side pipe end 3 (or the male side pipe end 3 is externally fitted with the packing 6), and then the male side pipe end 3 is inserted into the female side pipe end 2.
Is inserted, and the push wheel 12 is moved toward the female tube end portion 2 side (the engagement piece 20 is fitted in the notch portion 18), and the push wheel 12 is rotated within one rotation. With a series of simple operations, the pipe connection and packing 6
Can be installed.

FIG. 3 shows a second embodiment of the packing mounting structure according to the present invention. The difference from the first embodiment is that the engaging piece 20 is provided on the outer peripheral side of the push wheel 12.
Is provided, and accordingly, an inclined cam 19 is provided on the inner peripheral side of the receiving portion 8 of the female-side pipe end portion 2. That is, the push wheel 12 has the small diameter cylindrical portion 26 that can be inserted into the receiving portion 8 of the female side tube end portion 2, and the engaging piece 20 is radially outward from the outer peripheral surface of the small diameter cylindrical portion 26. It is designed to project toward.

Further, the female tube end portion 2 is provided with an oblique groove 27 provided so as to penetrate the tube wall of the receiving portion 8 and the flange portion 9 in communication with the groove 27 so as to penetrate the flange portion 9 in the tube axial direction. Thus, the inclined cam 19 is constituted by the inner surface of the groove 27. Needless to say, the hole 28 is used for passage of the engagement piece 20.

In this embodiment, a plurality of tool engaging recesses 30 (four in the illustrated example) for turning tools (not shown) are provided on the outer peripheral surface of the push ring 12 in an equidistant manner, and the male side pipe end is provided. One screw hole 31 for a set screw (not shown) is provided or a plurality of screw holes 31 (for example, two at symmetrical positions) are arranged equidistantly so as to prevent rotation of the portion 3. Other configurations, operations and the like are substantially the same as those in the first embodiment.

FIG. 4 shows a third embodiment of the packing mounting structure according to the present invention, and FIG. 5 shows the same fourth embodiment. The first and second embodiments are different from the pushing wheel. 12
And the inclined cam 19 and the engaging piece 20 with respect to the female side pipe end portion 2.
The object to provide is the opposite. That is, the third and fourth
In each of the embodiments, the push wheel 12 is provided with the inclined cam 19 and the female tube end portion 2 is provided with the engaging piece 20.

In the third embodiment (see FIG. 4), an inclined cam 19 is provided on the inner peripheral side of the push wheel 12, and the female tube end portion 2 is provided.
The engaging piece 20 is provided on the outer peripheral side of the receiving portion 8 of the, while in the fourth embodiment (see FIG. 5), the inclined cam 19 is provided on the outer peripheral side of the push wheel 12, and the female side is provided. An engagement piece 20 is provided on the inner peripheral side of the receiving portion 8 of the tube end portion 2.

Other configurations and operations are substantially the same as those of the first or second embodiment. The present invention is not limited to each of these embodiments. For example, the female pipe end 2 is not limited to being configured as the coupling 1, but may be configured as a joint member such as an elbow or cheese, or as a pipe connecting portion such as a valve or an instrument. What
Alternatively, it may be provided directly on one end of the tube.

In the above embodiment, the coupling 1 is made of cast iron, but the inclined cam 19 may be provided on the coupling 1 at the same time as casting.
It can also be provided by machining. The entire coupling 1 may be machined out of the pipe material. The coupling 1 (female side pipe end portion 2), the male side pipe end portion 3, the push ring 12 and the like may be made of resin.

The number of combinations of the inclined cam 19 and the engagement piece 20 is not limited as long as it is two or more.
The engagement piece 20 is not limited to being provided by fixing a pin-shaped object, but may be provided by integrally forming a tongue-shaped projection, for example. When the inclined cam 19 is provided on the inner peripheral side of the female-side tube end portion 2 as in the second embodiment (see FIG. 3), the inclined cam 19 is not the groove 27 penetrating the tube wall, It is also possible to form it by a groove provided in a concave shape on the inner wall of the tube.

The use as a pipe is not limited to drainage.

[0027]

According to the present invention, which has the above-described structure, the push ring is externally fitted to the male side pipe end, and the packing is fitted in the receiving portion of the female side pipe end. When the male tube end is inserted into the end and then the push wheel is rotated within one rotation while the push wheel is in contact with the packing, the push wheel and the receptacle part are inclined with respect to the engaging piece. The cam engages around the pipe axis to gradually increase the degree of engagement. Therefore, the amount of turning operation of the push wheel may be small, and since no bolts and nuts are used,
The work does not become troublesome. Of course, since the bolts and nuts are not used, the piping space can be reduced.

Moreover, unlike the case of engraving a female screw or a male screw having a diameter larger than the pipe diameter in the receiving portion of the push ring or the female side pipe end, the structure is simple and the manufacturing cost is increased. Can be suppressed. In the inclined cam, if the reverse inclined portion is provided at the end portion in the direction in which the engagement with the engaging piece is strengthened, when the engaging piece is positioned on the reverse inclined portion, the operation of eagerly escaping the engaging piece As long as it is not, the engaging piece will not escape without permission.

[Brief description of drawings]

1A and 1B show a first embodiment of a packing mounting structure according to the present invention, in which FIG. 1A is a side sectional view and FIG. 1B is a side view of essential parts.

FIG. 2 is an exploded perspective view showing a receiving portion and a push ring of the first embodiment.

FIG. 3 is an exploded perspective view showing a receiving portion and a push ring of a second embodiment.

FIG. 4 is a side sectional view showing an enlarged main part of the third embodiment.

FIG. 5 is a side sectional view showing an enlarged main part of the fourth embodiment.

FIG. 6 is a side sectional view showing a first conventional example.

FIG. 7 is a side sectional view showing a second conventional example.

[Explanation of symbols]

 2 Female-side pipe end 3 Male-side pipe end 6 Packing 8 Receptacle 9 Flange 12 Pressing ring 19 Inclined cam 20 Engaging piece 22 Reverse inclined part

Claims (3)

[Claims] 1. A structure in which a packing (6) is attached to a pipe connecting portion between a female side pipe end (2) and a male side pipe end (3),
A receiving opening (8) for accommodating the packing, which is provided on the female tube end (2) side, and a packing pressing wheel (12) rotatably fitted on the male tube end (3). One of the receiving portion (8) and the push wheel (12) has at least two engaging pieces (20) provided on the other when the push wheel (12) is rotated within one rotation. ), The same number of inclined cams (19) that can be engaged and disengaged around the tube axis.
The packing mounting structure of the pipe connecting portion is characterized by being provided. 2. The inclined cam (19) is provided with a flange portion (9) projecting radially outward with respect to an opening peripheral portion of the receiving portion (8), so that the periphery of the flange portion (9) is increased. 2. The pipe connecting portion according to claim 1, wherein the engaging piece (20) is formed so as to project radially inward from an inner peripheral portion of the push ring (12). Packing mounting structure. 3. The engaging piece (2) is attached to the inclined cam (19).
The pipe according to claim 1 or 2, wherein a reverse inclined portion (22) for preventing the engagement piece (20) from coming out is provided at a terminal end portion in a direction in which the engagement with (0) is strengthened. Packing structure for connecting parts.