JPH10169880A - Plastic pipe connecting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting member whose parts can be controlled with ease, which ensures the operator to correctly secure parts and can be slid at a specified position and surely be locked even if there is a little scattering in the dimension of plastic pipes, and whose locking position can be changed with ease. SOLUTION: In a connecting member comprising a fitting body 1 having an inner core section 4, in either a collar section 2 or 3 of which unevenness 5 is etched, center ring 7 and outer ring 14, with the center ring 7 engaged inside of the outer ring 14 with a play, the pipe end of a plastic pipe 21 is inserted into the inside space, and the pipe end of the plastic pipe 21 is made to slide to the outer peripheral surface of the inner core section 4 and externally fitted by the center ring 7 and the outer ring 14, and can be pressed from the outside to be locked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connecting member for a plastic pipe. More specifically, the present invention relates to a plastic pipe connecting member that can reduce the number of components used when connecting the joint body and the plastic pipe, and can securely lock and connect the plastic pipe.

[0002]

2. Description of the Related Art In recent years, pipes for hot water supply and water supply in general houses, apartment houses, commercial buildings, hotels, etc., and pipes for heating media for floor heating of houses have been recently used for corrosion resistance, earthquake resistance, hygiene, and workability. From such a viewpoint, a plastic fluid pipe (hereinafter, referred to as a plastic pipe) has become widespread. On the other hand, when connecting a plastic tube to a device, a joint is always arranged. Conventionally, as described in, for example, JIS B2354, this joint has an inner core portion protruding from one side of a joint main body, and an outer peripheral surface of a pipe end of a plastic pipe fitted externally to this portion is formed inside. A method of fastening with a nut via a ring is known. Further, a method has been proposed in which irregularities are carved on the outer peripheral surface of the inner core portion, and a plastic pipe is locked and connected by a retaining ring carved with a female screw on the inner wall surface (Japanese Patent Application Laid-Open No. 7-243571). reference).

[0003]

However, the above J
According to the method of IS B2354, there is a drawback that the plastic tube is easily detached from the inner core portion. In addition, the inner core portion protrudes from one side of the joint main body, and the end of the plastic tube fitted externally to this portion. The parts required in the method of tightening the outer peripheral surface with a nut via a ring are three points: the joint body, the holding ring, and the nut. Even if the parts are at most three points, the manufacturing cost cannot be neglected. In addition to the complicated parts management such as storage and transportation, it is inevitable that the connection work becomes complicated, for example, when the unskilled person performs the connection work, erroneously arranges the equipment.

Further, according to the method described in Japanese Patent Application Laid-Open No. 7-243571, the amount of female screw biting into the surface of the plastic tube is not constant due to a slight difference in the size of the plastic tube, and the holding ring is attached. In such a case, it is necessary to rotate several times, and at that time, there is a disadvantage that the force required for rotating varies and is not constant. Further, there is a drawback that it is extremely difficult to remove the holding ring when it is desired to change the locking position of the plastic pipe after fitting the end of the plastic pipe to the inner core portion and locking the plastic pipe with the holding ring. I found something.

Under these circumstances, the present inventors have conducted intensive studies to provide a connecting member and a connecting method for a plastic pipe which eliminate the disadvantages of the conventional method.
The present invention has been completed. The present invention aims at the following. 1. To provide a connecting member for a plastic tube having a small number of parts. 2. Provided is a connecting member for a plastic tube that can securely slide and lock an end of the plastic tube to a predetermined position even if the dimensions of the plastic tube are slightly different. 3. Provided is a connecting member for a plastic tube that allows a retaining ring to be easily removed when it is desired to change a locking position of the plastic tube.

[0006]

In order to solve the above problems, the present invention provides a joint body having an inner core having an outer surface provided with irregularities on one side of a flange; In a connecting member for a plastic pipe comprising a middle ring for externally fitting a plastic pipe on the outer peripheral surface and pressing it from the outside and an outer ring for loosely fitting the middle ring to the inside, one end of the short cylindrical middle ring is The inner peripheral surface has a slightly smaller diameter than the other part at the foremost end to form an annular blade, and a convex ring is formed on the outer peripheral surface following the annular blade, and the inner ring has other parts. On the end side, a plurality of convex rings are formed on the outer peripheral surface, and on the wall surface, a plurality of split rings from the tip of the annular blade on one end to the vicinity of the first convex ring on the other end are formed. A groove is formed along the longitudinal central axis of the middle ring, The ring gap portion of the convex ring of the middle ring to allow loosely fitted is formed, characterized by comprising, providing a connection member of plastic tubes.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The connection member of the plastic pipe according to the present invention is a joint body,
It is composed of three parts, the middle ring and the outer ring. Usually, the middle ring is installed inside the outer ring immediately after the middle ring and the outer ring are manufactured. At the time of work, it can be handled in the same manner as when two parts are used.

[0008] The joint main body has an inner core portion on one side of the flange portion, on the outer peripheral surface of which an unevenness is engraved. The flange portion of the joint body has a function of engaging a tool when sliding a holding ring described later. The structure on the opposite side of the inner core portion with respect to the flange portion is not particularly limited, and may be directly attached to the header, or a male screw, a female screw, a union, or the like may be joined. The number of the flanges may be one or plural.
The outer shape of the flange may be circular or polygonal such as hexagonal. The outer diameter of the flange portion is set to be larger than the maximum diameter of the inner core portion, and can be selected as long as the object of the present invention can be achieved.

The inner core portion of the joint body has a function of externally fitting the pipe end of the plastic pipe and engaging the plastic pipe with the middle ring and the outer ring from the outside. It is necessary that irregularities are carved on the outer peripheral surface of the inner core portion. The concavo-convex shape is not limited as long as it has an angled ring or a structure formed on the outer peripheral surface of the inner core portion of this type of joint. The maximum diameter of the inner core portion should be selected in consideration of the type of plastic, the inside diameter and thickness of the plastic tube, the inside diameter of the middle ring, and the like.

The middle ring is attached to the outer periphery of the end of the plastic tube, and has a function of sliding the plastic tube together with the outer ring to a predetermined position on the outer peripheral surface of the inner core portion and locking the position at that position. Since the end of the plastic tube is inserted into the inner peripheral space of the short ring-shaped middle ring, the diameter of the ring is slightly larger than the diameter of the plastic tube. At one end of the middle ring, an annular blade slightly smaller in diameter than other portions is formed. The annular blade bites into the plastic tube when the middle ring is slid into place by a tool, ensuring engagement of the plastic tube with the outer peripheral surface of the inner core portion.

[0011] The middle ring further has a convex ring formed on the outer peripheral surface following the annular blade. The convex ring has a cross section when the middle ring is cut so as to pass through the central axis in the longitudinal direction so as to exhibit a mountain-shaped convex ring. This convex ring is loosely fitted in a gap portion of the outer ring described later, and when the middle ring is loosely fitted to the outer ring immediately after manufacturing the middle ring and the outer ring, the middle ring is hardly detached from the outer ring, It can be handled as if it were a single part. It is preferable to form a plurality of convex rings (flanges) on the outer peripheral surface of the other end of the middle ring. A plurality of convex rings (flanges) formed on the outer peripheral surface on the other end side are used when the middle ring is loosely fitted to the outer ring, when the plastic tube is locked by the middle ring and the outer ring, and the like. Can be. The shape of the convex ring (flange) may be circular or polygonal.

On the cylindrical wall surface of the middle ring, a plurality of split grooves extending from the tip of the annular blade at one end to the vicinity of the first convex ring (flange) at the other end are provided. It is formed radially along a plane passing through the direction center axis. The plurality of split grooves make it possible to reduce the outer diameter when the middle ring is loosely fitted to the outer ring, and the spring is formed at a position where the convex ring at one end of the middle ring reaches the gap of the outer ring. The outer diameter is returned to the original size by the action, and the middle ring acts so as not to be easily detached from the outer ring. Further, when the plastic tube is locked at a predetermined position by the middle ring and the outer ring, the outer ring presses the convex ring on one end side so that the annular blade of the middle ring bites into the surface of the plastic tube, and Engagement of the inner core portion of the tube with the outer peripheral surface can be ensured.

The length from the tip of the annular blade on the wall surface of the middle ring to the vicinity of the first convex ring on the other end is determined when the middle ring is loosely fitted into the gap of the outer ring. It is preferable that the length of the annular blade is such that the distal end portion thereof comes into contact with the inclined surface of the outer ring at the joint body side in the gap of the outer ring. This is because when the plastic tube is inserted into the middle ring and the plastic tube is slid along the outer peripheral surface of the inner core portion, the inclined surface of the convex ring of the middle ring presses and moves the outer ring at this contact surface. .

The outer ring has a short cylindrical shape and functions to cover the middle ring and to make the annular blade of the middle ring bit into the surface of the plastic tube. The outer ring has a gap formed therein in which a convex ring at one end of the middle ring can be loosely fitted. The void portion has a cross section cut along the central axis in the length direction of the ring, which is a void portion larger than the convex ring at one end formed in the middle ring,
It is preferable that the inner diameter of a portion disposed on the joint body side with the gap therebetween is substantially the same as the inner peripheral surface of the middle ring. The inner diameter of the part arranged on the side away from the joint body is
From this part, the middle ring is pressed into the outer ring by pressing the plurality of split grooves of the middle ring toward the center axis side of the middle ring and pressing the convex ring following the annular blade to the minimum diameter and pushing it into the outer ring. Preferably, it is in the range.

The gap portion of the outer ring is formed such that the inclined surface of the portion arranged on the joint body side has a small angle (α °) with respect to the normal inner peripheral surface of the outer ring, and is located on the side away from the joint body. It is preferable that the inclined surface of the portion to be disposed is an inclined surface having a large angle (β °) with respect to the normal inner peripheral surface of the outer ring so as to satisfy the relationship α <β. As described above, when the plastic pipe is slid along the outer peripheral surface of the inner core portion, the inclined surface having a large angle of the gap is pressed by the inclined surface of the convex ring at one end of the middle ring. When the diameter of the plastic pipe is smaller than usual, the annular blade of the middle ring cuts into the plastic pipe, and the diameter of the convex ring of the middle ring becomes smaller.In this case, move the outer ring to the joint body side Thereby, the small angled inclined surface of the outer ring presses the convex ring of the middle ring, and the annular blade can be cut into the plastic tube.

By moving the outer ring toward the joint body, the plastic pipe does not reach the flange of the joint body. In this case, the middle ring is separated from the flange by a tool, and one end of the middle ring is removed. When the convex ring on the side is released from the state of being pressed by the small angled inclined surface of the outer ring, the annular blade that has cut into the plastic tube returns to its original position due to the action of the spring of the middle ring. Withdrawing, the connection operation can be performed again.

The outer ring is preferably provided with a plurality of viewing holes or cutouts at the end located on the joint body side along the pressing ring peripheral wall. The peep hole or notch functions as a hole for visually observing whether or not the plastic tube is locked at a predetermined position after sliding the plastic tube along the outer peripheral surface of the inner core portion.

The position where the peep hole or notch is provided depends on the diameter, thickness and length of the outer ring, but the peep hole is located at a distance of 1.5 to 5 mm from the outermost end of the outer ring. Preferably, it is formed by penetrating the wall surface of the outer ring. The shape of the peephole is not limited, and may be circular or rectangular.
The diameter or width of the peephole depends on the diameter, thickness,
Although it depends on the length, it is preferable to select from a range of 1 to 5 mm.
The notch is preferably provided at the outermost end of the outer ring, and the cylindrical wall surface of the outer ring may be cut into a triangular or square shape.

Next, a method of connecting a plastic pipe with the above-mentioned connecting member will be described. At the time of connection, first, a plastic pipe is inserted from the side where the convex ring (flange) at the other end is formed on the outer peripheral surface of the middle ring in which the middle ring is loosely fitted to the outer ring, and To the end face located on the joint body side of the outer ring. Then, insert the tip of the inner core of the joint body into the space of the plastic pipe in this state, engage the tool between the flange of the joint body and the flange on the other end side of the middle ring, and inward The middle ring with the plastic tube attached is moved to the flange side of the joint body. By this movement, the plastic tube can be slid to a predetermined position along the outer peripheral surface of the inner core while holding the plastic tube with the press ring. When sliding,
The inner peripheral wall of the plastic tube is forcibly expanded by the outer peripheral surface of the inner core portion, the outer peripheral wall of the plastic tube is held down by the inner peripheral wall of the middle ring, and the annular blade of the middle ring cuts into the outer peripheral wall of the plastic tube, and the plastic tube is removed. Is locked to the outer peripheral wall of the inner core portion.

At the end of the connection work, it is possible to visually check the end of the plastic pipe through the peephole to determine whether the construction was completed or incomplete. In the case of incomplete construction, as described above, the connection operation can be performed by protruding the end of the plastic pipe from the end face of the outer ring on the joint body side by a required length.

The plastic pipe to which the connecting member according to the present invention can be applied is preferably one having a diameter in the range of 5 to 20 mm, and the plastic pipe is not particularly limited, but a crosslinked polyethylene pipe, a polybutene pipe and the like are suitable. .

Hereinafter, the connecting member according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the examples described below unless exceeding the gist. The drawings show a connecting member according to the present invention and a state where a plastic pipe is connected to a joint body using the connecting member. FIG. 1 is a partially cutaway side view of a member constituting the connecting member according to the present invention. FIG. 2 is a partially cutaway side view showing a state in which the connection work has been completed.

The joint main body 1 has an inner core portion 4 on one side of the flange portions 2 and 3, on the outer peripheral surface of which an asperity 5 is engraved. As described above, the shape, height, number, interval, and the like of the irregularities 5 can be appropriately selected. The drawing shows an example having two flanges 2 and 3. In the joint body 1,
Although an example is shown in which the pipe joint 6 is a male screw on the side opposite to the inner core 4 with the flange 2 interposed therebetween, it is not limited to this example as described above.

The middle ring 7 is formed at one end thereof with an annular blade 8 having a diameter slightly smaller than that of the other portion, and a convex ring 9 following the annular blade 8, and has a central axis in the longitudinal direction of the ring. Convex rings 10 and 11 having a mountain-shaped cross section when cut so as to pass through are formed.
Are formed in the vicinity of the first convex ring 10. The drawing shows an example in which two convex rings (flanges) 10 and 11 are formed on the other end side of the middle ring 7.

A gap 15 is formed in the inner wall surface of the outer ring 14, and the inner diameter of a portion 16 arranged on the joint body side is:
The inner diameter of the portion 17 on the side away from the joint body is made smaller. The gap 15 has a slope 18 having a large angle with respect to the normal inner wall surface (portion 16 or 17) and a slope 19 having a small angle with respect to the normal inner wall surface (portion 16 or 17).
And is formed by. A notch 20 is formed at an end of the outer ring 14 arranged on the joint body side. FIG. 1 shows the state in which the middle ring 7 and the outer ring 14 are separated from each other. Usually, however, these two parts allow the middle ring 7 to be loosely fitted to the outer ring 14 immediately after the manufacture thereof, such as for storage and transportation. Parts management shall be handled as one.

When the plastic tube 20 is inserted into the inside of the middle ring 7 and a tool is engaged between the flange 3 of the joint body and the convex ring 10 of the middle ring to reduce the distance therebetween, the plastic tube 21 becomes The outer peripheral surface of the inner core portion 4 is slid toward the flange 3 of the joint body. During this time, the annular blade 8 bites into the plastic tube 20, thereby causing the plastic tube 2
0 can be prevented from coming off the inner core portion 4.

After the connection operation is completed, the tool fixed between the flange 3 and the convex ring 10 of the middle ring is removed, and the position of the plastic tube 21 from the notch 20 is visually observed and confirmed. Observation from the notch 20 shows that the plastic tube 2
When one pipe end is recognized, it is determined that the construction is complete.
When the pipe end of the plastic pipe 21 is not recognized by visual observation from the notch 20, it is determined that the construction is incomplete. In the case of incomplete construction, the middle ring 7
Is separated from the flange 3 with the outer ring 14, the end of the plastic tube 21 is pushed out from the end of the middle ring 7, and the connection operation is performed again. Similarly, the end of the plastic tube 9 is visually observed through the peephole. Confirm by observation.

[0028]

As described above, the present invention has the following extremely advantageous effects, and its industrial utility value is extremely large. 1. In the connection member according to the present invention, the number of parts is the joint body 1,
It is composed of three points, the middle ring 7 and the outer ring 14,
Immediately after manufacture, the middle ring 7 is loosely fitted to the outer ring 14 so that it can be handled as one part and a total of two parts. Therefore, parts management such as storage, transportation and handling is extremely convenient. is there. 2. When connecting using the connecting member according to the present invention, the number of parts can be reduced and the same can be handled, and since the position at the time of joining the plastic pipe is also determined, the worker can join in the joining direction. The connection work can be easily performed without a skilled person without error. 3. When connecting using the connecting member according to the present invention, when it is desired to change the locking position of the plastic pipe, the work of removing the middle ring and the outer ring is easy, and the locking position of the plastic pipe is easily corrected. Can be

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a state immediately before the start of connection work.

FIG. 2 is a partially cutaway side view showing a state in which a connection operation has been completed.

[Explanation of symbols]

 1: Joint body 2, 3: Flange 4: Inner core portion 5: Irregular portion on outer peripheral surface of inner core portion 6: Pipe joint 7: Middle ring 8: Annular blade 9: Convex ring of mountain shape 10, 11: Convex ring 12: Wall surface of middle ring 13: Split groove 14: Outer ring 15: Void portion 16: Portion of middle ring located on the joint body side 17: Portion of middle ring away from joint body 18: Normal Slope with large angle to inner wall surface 19: Slope with small angle to normal inner wall surface 20: Notch 21: Plastic pipe

Claims (4)

[Claims] 1. A joint body having an inner core portion having a concave and convex portion formed on an outer peripheral surface on one side of a flange portion, and a middle ring for externally fitting a plastic pipe on the outer peripheral surface of the inner core portion and pressing the plastic tube from the outside. And a connecting member of a plastic pipe consisting of an outer ring in which the middle ring is loosely fitted inside, in the short tubular middle ring, the inner peripheral surface at one end is slightly smaller in diameter than the other part at the innermost end. Is formed into an annular blade, a convex ring is formed on the outer peripheral surface following the annular blade, and a plurality of convex rings are formed on the outer peripheral surface on the other end side of the middle ring. And, on the wall surface, a plurality of split grooves are formed along the longitudinal center axis of the middle ring from the distal end portion of the annular blade on one end side to the vicinity of the first convex ring on the other end side. The outer ring has a gap that allows the convex ring of the middle ring to be loosely fitted. A connection member for a plastic tube, which is formed. 2. The outer ring has a portion disposed on the joint body side with the gap portion interposed therebetween having an inner diameter substantially equal to an inner peripheral surface of the middle ring, and a portion on a side away from the joint body. The inner diameter is such that the plurality of split grooves of the middle ring are pressed toward the center axis side of the middle ring so that the convex ring following the annular blade has a minimum diameter and can be pushed into the outer ring. The connecting member for a plastic pipe according to claim 1, wherein 3. The gap of the outer ring is larger than the convex ring of the middle ring, and the inclined surface of the portion disposed on the joint body side is inclined with respect to the normal inner peripheral surface of the outer ring. The connecting member of a plastic pipe according to claim 1 or 2, wherein the connecting member is formed at a small angle, and an inclined surface on a side away from the joint body is formed at a large angle with respect to a normal inner peripheral surface of the outer ring. 4. The connecting member for a plastic pipe according to claim 1, wherein at least one peephole or notch is provided on the outer ring at the flange side of the joint main body.