JP2549747Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a cap nut type fitting for connecting a connecting pipe such as a synthetic resin pipe for water supply or the like, and it is easy to confirm an appropriate tightening amount of the cap nut. It relates to a simple pipe joint.

[0002]

2. Description of the Related Art When connecting a synthetic resin pipe or the like using a cap nut type pipe joint, the cap nut is tightened to the pipe joint body, and the end face of the cap nut is attached to the end face of the flange of the pipe joint body. When the pipes are connected in a narrow and dark pipe place when they are brought into contact with each other, it is not possible to accurately visually confirm that the end faces are in contact with each other.

[0003] In this case, proper management of the amount of tightening must rely on a method of controlling the tightening amount with a sense transmitted to the hand, and there is large variation in the construction. There was a problem that the amount of tightening was insufficient and water leakage occurred.

[0004]

Conventionally, when a cap nut is screwed into a cylindrical portion of a pipe joint body as described in Japanese Patent Application Laid-Open No. 1-145488, for example, By providing a flange body having a locking claw that bites into the distal end surface, a pipe joint that can always detect the final tightening time, or a cap nut and a cylindrical portion, as described in JP-A-1145489. There has been proposed a pipe joint which is provided with a fastening member having a projection that cuts into each of the opposing surfaces of the cap nut and the flange portion when screwing in, so that the final fastening point can always be sensed.

[0005] However, even when such a pipe joint is used, there is still a variation in construction. In other words, even when the collar body or the projection comes into contact with the opposing surfaces of the cap nut and the collar portion, it is not enough to sense an appropriate amount of tightening with a sensation transmitted to the hand, and excessive tightening occurs due to excessive tightening. However, there is a problem that a part of the essential part may be broken or deformed to cause water leakage.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and makes it very easy to visually check the proper amount of tightening of the cap nut to the pipe joint body. Accordingly, an object of the present invention is to provide a pipe joint that can prevent an important part of the pipe joint from being cracked or deformed due to excessive tightening or insufficient tightening and causing water leakage. It is.

[0007]

According to a first aspect of the present invention, at least one end is provided with a substantially cylindrical fastening portion having an external thread formed on an outer peripheral surface, and a base end portion of the fastening portion. An approximately cylindrical guide portion is provided which projects in the distal direction of the tightening portion at an interval for inserting an end portion of a connection pipe to be connected from the inside of the connection portion, and a flange portion is provided along a circumferential direction at a substantially central portion. A female threaded portion that is screwed to the male threaded portion of the pipe joint body is formed on the inner peripheral surface of the distal end portion, and a substantially cylindrical shape provided with a pressing portion on the inner peripheral surface of the proximal end portion. It consists of a cap nut and a packing inserted inside the pressing part of the cap nut or attached to the outer peripheral surface of the guide part. By tightening the cap nut to the pipe joint body, the tip of the cap nut is connected to the pipe joint. Close to the flange of the main body, and press the cap nut The inserted packing is pressed against the outer peripheral surface of the connecting pipe, or the tightening portion of the pipe joint body is pressed against the outer peripheral surface of the connecting pipe by the pressing portion of the cap nut, and the inner peripheral surface of the connecting pipe is guided by the guide portion. A pipe joint pressed against a packing mounted on an outer peripheral surface, wherein an inclined surface is provided on one of a tip surface of a cap nut and a side face on a cap nut side of a flange portion of the pipe joint body, and the other is a pipe joint. This is a pipe joint having a projection which can be brought into contact with the inclined surface when a female screw of a cap nut is tightened to a male screw of a main body, and a portion which is easily bent or broken at a base end of the projection.

According to a second aspect of the present invention, at least one end is provided with a substantially cylindrical tightening portion having an external thread formed on an outer peripheral surface, and is connected from inside a base end of the tightening portion. A pipe joint body provided with a substantially cylindrical guide portion protruding in the distal direction of the tightening portion with an interval for inserting an end portion of the connection pipe to be inserted, and a flange portion provided in a substantially central portion along a circumferential direction; A female screw portion formed on the inner peripheral surface of the distal end portion to be screwed with the male screw portion of the pipe joint body, and a substantially cylindrical cap nut provided with a pressing portion on the inner peripheral face of the base end portion; and a cap nut. Consisting of a packing inserted into the inside of the pressing part or attached to the outer peripheral surface of the guide part, and tightening the cap nut to the pipe joint body so that the tip of the cap nut is close to the flange of the pipe joint body. As well as the pack inserted inside by the pressing part of the cap nut. Or press the clamping part of the pipe joint body against the outer peripheral surface of the connecting pipe by the pressing part of the cap nut, and press the inner peripheral surface of the connecting pipe to the outer peripheral surface of the guide part. A pipe joint to be pressed against the mounted packing, wherein a projection is provided on the outer peripheral surface of the tightening portion of the pipe joint body, the side surface of the flange portion on the side of the cap nut, or the tip surface of the cap nut, and the base end of the protrusion is provided with a bag. This is a pipe joint provided with a portion that is easily damaged when pressed against the tip end surface of the nut or the side surface of the flange portion of the pipe joint body on the side of the cap nut.

In the present invention, the pipe joint body has a substantially cylindrical tightening portion having an external thread formed on the outer peripheral surface thereof, and an end portion of a connecting pipe to be connected from inside the base end of the tightening portion. There is provided a substantially cylindrical guide portion protruding in the distal direction of the tightening portion at an interval for inserting, but these may be provided only at one end of the pipe joint body, or may be provided at both ends. May be provided.

In the present invention, a packing is provided. This packing may be inserted inside the pressing portion of the cap nut or may be mounted on the outer peripheral surface of the guide portion. When the cap nut is tightened to the fitting body,
In the former case, the packing inserted into the inside of the connection pipe is pressed against the outer peripheral surface of the connecting pipe by the pressing part of the cap nut, and in the latter case, the tightening part of the pipe joint body is connected by the pressing part of the cap nut. The outer peripheral surface of the pipe is pressed, and the inner peripheral surface of the connecting pipe is pressed against the packing mounted on the outer peripheral surface of the guide.

In the invention of claim 1 of the present application, the inclined surface and the projection which can contact the inclined surface are provided, but the inclined surface is provided on the side surface of the flange of the pipe joint body on the side of the cap nut. The projection may be provided on the tip surface of the cap nut, the inclined surface may be provided on the tip face of the cap nut, and the projection may be provided on the side face of the collar portion of the pipe joint body on the cap nut side. May be.

The inclined surface provided on the side surface of the flange portion of the pipe joint body on the side of the cap nut or the tip surface of the cap nut may be provided over the entire circumference in the circumferential direction, or a concave groove portion is interposed. Thus, it may be provided at a plurality of locations in the circumferential direction. Further, the projection provided on the side surface of the flange portion of the pipe joint body on the side of the cap nut or the tip face of the cap nut is preferably provided separately at a plurality of locations in the circumferential direction, but over the entire circumference in the circumferential direction. It may be provided.

[0013] When provided over the entire circumference,
In order to protrude the tip portion outward when it comes into contact with the inclined surface, it is necessary to provide a plurality of portions along the pipe axis direction that are easily divided. The easily bendable portion provided at the base end of the projection may have a notch formed on the outer peripheral surface or the like, for example, and may have a thin shape or a hollow shape.

In the invention of claim 2 of the present application, there is provided a projection which is broken when it is pressed against the front end face of the cap nut or the side face of the flange of the pipe joint body on the cap nut side, and which protrudes outward. The protrusion may be provided on the outer peripheral surface of the tightening portion of the pipe joint body or on the side surface of the flange portion on the cap nut side, or may be provided on the tip end surface of the cap nut. The projections are preferably provided separately at a plurality of locations in the circumferential direction, but may be provided over the entire circumference in the circumferential direction.

[0015] When provided over the entire circumference,
When pressed against the side surface of the flange portion of the pipe joint body on the side of the cap nut or the tip face of the cap nut, a plurality of portions that are easily divided along the pipe axis direction are provided in order to break and pop out outwardly. There is a need. The easily breakable portion provided at the base end of the projection may have a notch formed on the outer peripheral surface or the like, for example, and may have a thin shape or a hollow shape.

[0016]

According to the first aspect of the present invention, an inclined surface is provided on one of the tip surface of the cap nut and the side face of the flange of the pipe joint body on the cap nut side, and the other is provided on the male screw portion of the pipe joint body. When the female screw portion of the cap nut is tightened, the inclined surface is provided with a protrusion that can be freely contacted, and the base end of the protrusion is provided with an easily bendable portion, so that the cap nut is tightened to the pipe joint body. Then, when the tip of the cap nut is brought close to the flange of the fitting body, the projection comes into contact with the inclined surface,
The protruding portion of the protrusion is projected outward with the easily bent portion of the base end serving as a fulcrum, and finally, the surface of the flange portion on the cap nut side and the front end surface of the cap nut come into contact, and the tightening torque suddenly increases. Increase. Since the point at which the projections protrude outward can be set as a guide for the appropriate amount of tightening, it is extremely easy to judge it, and excessive tightening can cause the critical part of the pipe joint to crack, deform, or reverse. There is no risk of insufficient tightening, which can prevent water leakage.

According to a second aspect of the present invention, a projection is provided on an outer peripheral surface of a tightening portion of a pipe joint body, a side surface of a flange portion on a side of a cap nut, or a front end surface of a cap nut. The tip of the cap nut is fastened to the pipe joint body by providing a portion which is easily damaged when pressed on the tip face of the cap or the side face of the flange of the pipe joint body on the cap nut side. Is brought close to the flange of the pipe joint body, the protrusion is damaged by being pressed or pulled or compressed by the tip face of the cap nut or the side face of the flange part of the pipe joint body on the cap nut side. The rotating force of the cap nut is applied and the cap nut is ejected outward, and finally, the face of the cap portion on the cap nut side and the tip face of the cap nut come into contact, and the tightening torque sharply increases. Since the point at which the projections protrude outward can be set as a guide for the appropriate amount of tightening, it is extremely easy to judge it, and excessive tightening can cause the critical part of the pipe joint to crack, deform, or reverse. There is no risk of insufficient tightening, which can prevent water leakage.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a partially cutaway front view showing an example of a pipe joint according to the invention of claim 1 of the present application. As shown in FIG. 1, the pipe joint of the present invention includes a pipe joint body 1, a cap nut 2, and a packing 5. The pipe joint main body 1 includes a joint body 11 and a slit ring 12 that is fitted to the joint body 11 outside.

The joint body 11 is formed in a substantially cylindrical shape from a synthetic resin material having excellent heat resistance, and has a guide portion 111 at one end portion through which one connection pipe 3 is inserted, and the other end portion at the other end. A connection section 112 to which the connection pipe 4 is connected is provided. The connection portion 112 has a male screw portion 112a formed on the outer peripheral surface. The packing 5 is mounted on the outer peripheral surface of the guide section 111. At a substantially central portion of the joint body 11, a square, for example, hexagonal nut portion 113 is provided.

The slit ring 12 is formed in a substantially cylindrical shape from a synthetic resin having excellent heat resistance, similarly to the joint body 11, and has a tightening portion 121 into which one connecting pipe is inserted at one end, and a second end. The outer peripheral surface is provided with a flange portion 122 having a hexagonal shape and protruding radially outward. A male screw portion 121a is formed on the outer peripheral surface of the fastening portion 121. The side surface of the flange portion 122 of the pipe joint body 1 on the side of the fastening portion 121 is provided with an inclined surface 122a whose diameter gradually increases toward the center along the circumferential direction. Further, a plurality of concave grooves 122b are provided between the inclined surfaces 122a.

The cap nut 2 is formed on the inner peripheral surface of the distal end with a female screw portion 21 which is screwed into the male screw portion 121a of the pipe joint body 1. In addition, an inclined surface pressing portion 22 having a diameter gradually increasing toward the distal end is provided on the inner peripheral surface of the base end portion.

A plurality of projections 23 are provided on the tip end surface of the cap nut 2 so as to protrude toward the flange 122 of the pipe joint body 1. The projection 23 is provided at a portion where the cap nut 2 is finally fitted into the concave groove portion 122b when the cap nut 2 is tightened to the pipe joint body 1. At the base end of the projection 23, a notch 23a is provided on the inner surface.

Then, when the cap nut 2 is tightened to the pipe joint body 1, the projection 23 comes into contact with the inclined surface 122a, and the tip of the projection 23 is supported by the thin portion provided with the notch 23a as a fulcrum. It is bent and popped out. Then, the distal end portion is finally fitted into the concave groove portion 122b in a bent state.

Next, an embodiment in which one connecting pipe 3 and the other connecting pipe 4 are connected by using the above-described pipe joint will be described.
This will be described with reference to FIGS. First, as shown in FIG. 1, one connecting pipe 3 is inserted between the guide part 111 and the tightening part 121 of the pipe joint body, and the other connecting pipe 4 is connected to the connecting part 11.
Extrapolate to 2. Then, the cap nut 2 is tightened to the pipe joint body 1, and the tip of the cap nut 2 is brought close to the flange 122 of the pipe joint body 1.

As a result, the tightening torque gradually increases when the projection 23 of the cap nut 2 comes into contact with the inclined surface 122a of the flange portion 122, and as shown in FIG. It is bent around the thin portion provided with the fulcrum and is projected outward. And finally, the projection 23
Is fitted into the groove 122b with its tip bent. At this time, the surface of the flange 122 on the side of the cap nut 2 and the end face of the cap nut 2 are brought into contact with each other, and the cap nut 2
The pressing portion 22 presses the distal end portion of the tightening portion 121 of the pipe joint body 1 against the outer peripheral surface of the connection pipe 3, thereby pressing the inner surface of the connection pipe 3 against the packing 5 mounted on the guide portion 111 and connecting. Seal the part. At this point, the tightening torque sharply increases. Therefore, the time when the projection 23 pops out can be regarded as a measure of an appropriate amount of tightening of the cap nut 2 with respect to the pipe joint body 1.

FIG. 3 is a longitudinal sectional view of a main part showing another example of the invention of claim 1 of the present application. On the side surface of the flange portion 122 of the pipe joint body 1 on the side of the fastening portion 121, there are provided protrusions 13 at a plurality of locations along the circumferential direction. A notch 13 a is provided on the inner surface of the base end of the ridge 13.

An inclined surface 24, which is the tip edge of the cap nut 2 and is in contact with the projection 13 when the cap nut 2 is tightened to the pipe joint body 1, is provided along the entire circumference in the circumferential direction. Other configurations are the same as those of the example described with reference to FIGS. 1 and 2, and thus detailed description thereof is omitted.

FIG. 4 is a partially cutaway front view showing an example of the pipe joint according to the second aspect of the present invention. As shown in FIG.
The pipe joint of the present invention includes a pipe joint body 6, a cap nut 7, and a packing 5. The pipe joint body 6 is composed of a joint body 61 and a slit ring 62 fitted to the joint body 61 outside.

The joint body 61 is formed in a substantially cylindrical shape from a synthetic resin material having excellent heat resistance, and is provided at one end with a guide portion 611 through which one of the connection pipes 3 is inserted, and at the other end with the other. A connection portion 612 to which the connection pipe 4 is connected is provided. The connection portion 612 has a male screw portion 612a formed on the outer peripheral surface. The packing 5 is mounted on the outer peripheral surface of the guide portion 611. At a substantially central portion of the joint body 61, a square, for example, a hexagonal nut portion 613 is provided.

The slit ring 62 is formed in a substantially cylindrical shape from a synthetic resin having excellent heat resistance, similarly to the joint body 61, and has a tightening portion 621 into which one connecting pipe is inserted at one end, and a slit at the other end. A flange portion 622 is provided on the portion, which protrudes radially outward and has a hexagonal outer peripheral surface. An external thread portion 621a is formed on the outer peripheral surface of the fastening portion 621. At the base end of the fastening portion 621 of the pipe joint body 6, a plurality of protrusions 63 protruding outward are provided along the circumferential direction. At the base end of the projection 63, a thinned portion 63a that is easily damaged is provided.
Is provided.

The cap nut 7 has a female screw portion 71 which is screwed to the male screw portion 621a of the pipe joint body 6 on the inner peripheral surface of the tip portion. An inclined surface-shaped pressing portion 72 whose diameter gradually increases toward the distal end is provided on the inner peripheral surface of the base end portion.

A projection 73 projecting in the direction of the flange 622 of the pipe joint body 6 is provided on the tip end surface of the cap nut 7 along the circumferential direction. Then, when the cap nut 2 is tightened to the pipe joint body 1, the ridge 73 presses the side surface of the tip of the projection 63 provided on the pipe joint body 6, and pulls the easily breakable portion 63 a. Broken pieces 6
3 '(see FIG. 5) is projected outward.

Next, an embodiment in which one connecting pipe 3 and the other connecting pipe 4 are connected using the above-described pipe joint will be described.
This will be described with reference to FIGS. First, as shown in FIG. 4, one connecting pipe 3 is inserted between the guide part 611 and the tightening part 621 of the pipe joint body, and the other connecting pipe 4 is connected to the connecting part 61.
Extrapolate to 2. Then, the cap nut 7 is tightened to the pipe joint body 6, and the tip of the cap nut 7 is brought close to the flange 622 of the pipe joint body 6.

Thus, the ridge 73 of the cap nut 7 presses the side surface of the tip of the projection 63 provided on the pipe joint body 6. At this stage, the tightening torque gradually increases, and as shown in FIG. 5, the ridge 73 pulls the side surface of the tip of the projection 63 to damage the easily damaged portion 63 a, and the broken piece 63 'Jump out. And
Finally, the front end surface of the ridge 73 of the cap nut 7 is brought into contact with the side surface of the flange 622 of the pipe joint body 6, and the pressing portion 72 of the cap nut 7 is connected to the front end of the fastening portion 621 of the pipe joint body 6. Is pressed against the outer peripheral surface of the connection pipe 3, whereby the inner surface of the connection pipe 3 is pressed against the packing 5 attached to the guide portion 611 to seal the connection portion. At this point, the tightening torque sharply increases. Therefore, when this projection 63 pops out,
This can be taken as a guide for an appropriate amount of tightening of the cap nut 7 to the pipe joint body 6.

FIG. 6 is a longitudinal sectional view of a main part showing another example of the invention of claim 2 of the present application. A plurality of projections 74 are provided on the tip surface of the cap nut 7 at a plurality of locations along the circumferential direction in the direction of the flange 622 of the pipe joint body 6. At the base end of the projection 74, a portion 74a which is thin and easily damaged is provided. The side surface of the flange 622 of the pipe joint body 6 on the side of the cap nut 7 is a vertical surface. 4 and 5 for other configurations.
, And the detailed description is omitted.

[0036]

Effect of the Invention The invention of claim 1 or claim 2 of the present application is
Since each is configured as described above, it is easy to determine the appropriate amount of tightening of the cap nut to the pipe joint body,
It is possible to prevent an important part of the pipe joint from being cracked or deformed due to excessive tightening, or from being insufficiently tightened and causing water leakage.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an example of a pipe joint according to the invention of claim 1 of the present application together with a connection pipe.

FIG. 2 is a partially cutaway front view illustrating a step of connecting a connection pipe to the pipe joint shown in FIG. 1;

FIG. 3 is a longitudinal sectional view of a main part showing another example of the pipe joint according to the invention of claim 1 of the present application.

FIG. 4 is a partially cutaway front view showing an example of the pipe joint according to the invention of claim 2 of the present application together with a connection pipe.

FIG. 5 is a partially cutaway front view illustrating a step of connecting a connection pipe to the pipe joint shown in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a main part of another example of the pipe joint according to the invention of claim 2 of the present application.

[Explanation of symbols]

 1,6 Fitting body 2,7 Cap nut 3 One connecting pipe 4 The other connecting pipe 5 Packing 13,23,63,74 Projection 13a, 23a Notch 21,21 Female thread 22,22 Pressing part 24,122a Inclined surfaces 63a, 74a Parts easily damaged 111, 611 Guide parts 112, 612 Connection parts 112a, 121a, 612a, 621a Male screw parts 121, 621 Tightening parts 122, 622 Flange parts 122b Groove parts

Claims (2)

(57) [Scope of request for utility model registration] At least at one end, a substantially cylindrical tightening portion having an external thread formed on an outer peripheral surface is provided, and an end of a connection pipe to be connected from inside a base end of the tightening portion is provided. A pipe joint body provided with a substantially cylindrical guide portion projecting in the distal direction of the tightening portion at an insertion interval, and a flange portion provided in a substantially central portion along the circumferential direction, and an inner peripheral surface of the distal portion A female screw part to be screwed to the male screw part of the pipe joint body is formed, and a substantially cylindrical cap nut provided with a pressing part on the inner peripheral surface of the base end part, and inside the pressing part of the cap nut. Consisting of a packing inserted or attached to the outer circumference of the guide,
By tightening the cap nut to the fitting body, the tip of the cap nut is brought close to the flange of the fitting body,
By pressing the packing inserted into the inside of the connection pipe by the pressing portion of the cap nut against the outer peripheral surface of the connection pipe, or by pressing the fastening portion of the pipe joint body against the outer peripheral surface of the connection pipe by the pressing portion of the cap nut, A pipe joint for pressing an inner peripheral surface of a connection pipe against a packing mounted on an outer peripheral surface of a guide portion, and is inclined to one of a tip surface of a cap nut and a side face on a cap nut side of a flange portion of the pipe joint body. A surface is provided, and on the other hand, when the female screw portion of the cap nut is tightened to the male screw portion of the pipe joint main body, a projection is provided that can abut on the inclined surface, and a protruding portion is provided at the base end of the projection. A pipe joint characterized in that: 2. At least at one end, a substantially cylindrical tightening portion having an external thread formed on an outer peripheral surface is provided, and an end of a connecting pipe to be connected from inside a base end of the tightening portion is provided. A pipe joint body provided with a substantially cylindrical guide portion projecting in the distal direction of the tightening portion at an insertion interval, and a flange portion provided in a substantially central portion along the circumferential direction, and an inner peripheral surface of the distal portion A female screw part to be screwed to the male screw part of the pipe joint body is formed, and on the inner peripheral surface of the base end, a substantially cylindrical cap nut provided with a pressing part, and inside the pressing part of the cap nut. Consisting of a packing inserted or attached to the outer circumference of the guide,
By tightening the cap nut to the fitting body, the tip of the cap nut is brought close to the flange of the fitting body,
By pressing the packing inserted into the inside of the connection pipe by the pressing portion of the cap nut against the outer peripheral surface of the connection pipe, or by pressing the fastening portion of the pipe joint body against the outer peripheral surface of the connection pipe by the pressing portion of the cap nut, A pipe joint for pressing an inner peripheral surface of a connection pipe against a packing mounted on an outer peripheral surface of a guide portion, wherein the outer peripheral surface of a tightening portion or a side surface of a flange portion of a flange portion of a pipe joint body, or a distal end surface of a cap nut. A pipe provided with a projection, wherein a base portion of the projection is provided with a portion which is easily damaged when pressed against the distal end face of the cap nut or the side face of the flange of the pipe joint body on the cap nut side. Fittings.