JP2005106247A - Insertion type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion type pipe joint capable of surely carrying out a water cut-off between a pipe joint main body and a connected pipe since an O ring which is a member of the water cut-off members is partly dented not to be withdrawn from the predetermined position in the pipe joint main body inside even if a pipe to be connected with the pipe joint main body is inserted obliquely. <P>SOLUTION: In the insertion type pipe joint having the pipe joint main body, a locking member having a locking pawl which is latched in the outer face of the pipe accommodated and connected in the pipe joint main body inside, and the water cut-off member to conduct the water cut-off between the outer face of the pipe accommodated and connected in the pipe joint main body inside and the pipe joint main body inside face, the pipe joint main body has a lumen portion which passes through in the axial direction from one end of the pipe joint main body to the other end where a major diameter portion to accommodate the locking member and the water cut-off member in the pipe insertion end side to be connected is provided and also has a run-off portion for the water cut-off member in the back portion of the major diameter portion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe joint for piping for supplying gas or liquid, particularly a plug-in pipe joint that can easily connect a pipe joint and a pipe for piping by one-touch by simply inserting the pipe tip into the pipe joint. It is about improvement.

For example, recently, when water supply or hot water supply pipes are installed in a detached house or an apartment house, a branching header is installed indoors, and then multiple water supply hot water supply pipes are installed in each room. Are connected to the header.
At this time, in order to facilitate the connection work between the header and each piping terminal, the pipe joint and the pipe can be easily connected by simply inserting the tip of the pipe to be connected into the pipe joint whose one end is connected to the header. Plug-in type pipe joints that can be connected to each other are increasingly used.

  An example of this type is shown in FIG. Here, FIG. 2A is a half cross-sectional view of a plug-in type pipe joint, and FIG. 2B is a half cross-section showing an example of a pipe that is inserted and connected to the plug-in type pipe joint shown in FIG. FIG.

As shown in FIG. 2 (a), this plug-in type pipe joint is provided at least inside a pipe joint body 1 made of a metal material such as gun metal, and is connected to the pipe joint body 1 shown in FIG. 2 (b). A substantially annular locking member 4 having a locking claw 3 for locking to the outer surface of the tube 2, for example, a plastic tube 2, and a stop between the outer surface of the tube 2 to be connected and the inner surface of the pipe joint body 1. And an annular water stop member 5 that performs water.
In addition, inside the pipe joint main body 1 is bored a lumen that penetrates in the axial direction from the insertion end side into which the pipe 2 to be connected is inserted to the other end. The large-diameter portion 10, the medium-diameter portion 20, and the small-diameter portion 30 penetrating through the other end are sequentially formed in the axial direction from the insertion end side where 2 is inserted.

In the large-diameter portion 10, a water stop member 5 made of an O-ring is first housed in the innermost part, and the above-described locking member 4 holds a washer 6 between the water stop member 5. It is stored in.
Here, the washer 6 and the locking member 4 are molded articles made of, for example, modified PPO (polyphenylene oxide). By the way, the locking member 4 is integrally formed, for example, in a state in which a section made of stainless steel is partially exposed, and this acts as the locking claw 3.

  The locking member 4 is provided with a slit in a part in the circumferential direction. When the distal end portion of the pipe 2 is inserted into the pipe joint main body 1, the locking claw 3 bites into the outer surface of the pipe 2 so that the pipe 2 does not come out of the pipe joint main body 1. More specifically, after the locking claw 3 is once connected, when the tube 2 is pulled out of the pipe joint, the locking claw 3 is inclined in the direction of biting by the outer surface of the tube 2 and is integrally formed with the locking member 4.

Reference numeral 7 denotes a support collar, and reference numeral 8 denotes a metal cap. The support collar 7 and the metal cap 8 cooperate to prevent the water stop member 5, washer 6 and locking member 4 from being detached from the large diameter portion 10 of the pipe joint body 1. It is attached to the end.
Incidentally, the cap 8 covers a part of the support collar 7 so that the support collar 7 does not come off from the large-diameter portion 10 of the pipe joint body 1 at one end, and the other end is caulked on the outer surface of the pipe joint body 1. The joint body 1 is integrated so as to be hugged.

  Further, the inner surface of the support collar 7, that is, the contact surface 40 with the locking member 4 is a tapered surface having a diameter that decreases toward the inlet side of the large-diameter portion 10 of the pipe joint body 1. When an external force that pulls out the pipe 2 from the pipe joint is applied to the connected pipe 2, the locking member 4 having a slit in a part of the circumferential direction is moved inward by the tapered contact surface 40. To reduce the diameter. As a result, the latching claw 3 also receives a force inward, and further bites into the outer surface of the pipe 2, and acts so that the pipe 2 becomes more difficult to come out of the pipe joint.

  FIG. 2B shows the tip of the pipe 2 connected to the pipe joint shown in FIG. 2A, and an in-core 50 is attached to the tip of the pipe 2. O-rings 51, 52, and 53 are attached to the outer surface of the in-core 50 in that order from the tip. Further, the flange portion 54 regulates the distal end position of the pipe 2 at one end, and the other end has a tapered surface that decreases in diameter toward the distal end portion so that insertion resistance during insertion into the pipe joint can be relaxed.

  One of the purposes of mounting the in-core 50 is to increase the water stoppage of the pipe joint and the pipe 2. Specifically, for example, when the pipe 2 is soft and easily deformed, when such a pipe 2 and a pipe joint are connected, high water stoppage cannot be obtained between them. In order to prevent the pipe 2 from being deformed, the in-core 50 is inserted into the pipe 2 to prevent the pipe 2 from being deformed, and the waterproof performance between the pipe joint and the pipe 2 connected to the pipe joint is ensured for a long time. ing. In view of such a purpose, the in-core 50 is made of metal, hard engineering plastic, or the like.

  FIG. 3 shows a state in which the pipe joint shown in FIGS. 2A and 2B and the pipe 2 connected thereto are connected. As shown in FIG. 3, the outer surface of the pipe 2 and the inner surface of the pipe joint body 1 are stopped by an O-ring 51 and a water-stop member 5 (also an O-ring), and the inner surface of the pipe 2 and the outer surface of the in-core 50 are The water is stopped by O-rings 52 and 53.

  In this state, if the pipe 2 is pulled from the pipe joint to the right in FIG. 3, that is, in the arrow direction, the locking claw 3 is already inserted into the outer surface of the pipe 2 when the pipe is inserted. Since the bite is in the engaged state, the locking member 4 moves together with the tube 2 in the direction of the arrow. When the locking member 4 moves in the direction of the arrow, the locking member 4 is provided with a slit in a part of its circumferential direction, and therefore receives a force radially inward by the contact surface 40 with the support collar 7. To reduce the diameter. As a result, the locking claws 3 bite into the outer surface of the pipe 2 more and more, and the pipe 2 becomes more difficult to come out of the pipe joint.

  Thus, the conventional plug-in pipe joint has the excellent effect that the pipe 2 is easily connected to the pipe joint, has a high water-stopping performance, and the pipe once connected is extremely difficult to come off. Have.

  As described above, the above-described plug-in pipe joint has an excellent effect that the pipe can be easily connected to the pipe joint, has a high water-stopping performance, and the pipe once connected is extremely difficult to come off. However, there were the following problems.

  As mentioned above, although the header to which one end of the plug-in fitting is connected is installed indoors, it is generally installed under the floor or behind the ceiling, so that sufficient work space is always secured around it. It is not always done. Also, the installation position is not only high in workability, but sometimes it is installed at a high position, and if you want to connect piping to a plug-in type fitting, connect the pipe to the fitting body. Sometimes it was difficult to insert horizontally.

The state is shown in FIG. FIG. 4 is a schematic diagram showing an example of connecting the pipe 2 to one of a plurality of pipe joints attached to the header 60.
Since the header 60 is now at a high position, the pipe operator extended his arm high and tried to insert the pipe 2 horizontally into the pipe joint body 1 but failed to insert it and tried to insert it diagonally from below. Assume that
An in-core 50 is attached to the tip of the tube 2 as shown in FIG.

In this way, when the tube 2 is to be inserted into the pipe joint body 1 from obliquely below, the tip of the tube 2, in this case, the tip of the in-core 50, tends to push up the locking member 4 obliquely upward. As a result, this force also acts on the water blocking member 5 housed in the back of the large diameter portion 10 via the washer 6, that is, the O-ring.
As a result of such an unexpected force acting, the reason is not clear, but with a slight probability, the O-ring cannot be maintained in an annular state and may be recessed inwardly and disengaged from a predetermined position. is there.

  If the pipe 2 is connected in such a state that the water-stopping member 5, that is, the O-ring is partially recessed inward and separated from the predetermined position, the water-stopping between the inner surface of the pipe joint body 1 and the outer surface of the pipe 2 is performed. There was a problem that it could not be performed normally.

  Accordingly, the object of the present invention is to provide a state in which the O-ring, which is a water-stopping member, is partially recessed and detached from a predetermined position inside the pipe joint body even if the pipe connected to the pipe joint body is inserted obliquely. Therefore, an object of the present invention is to provide a plug-in type pipe joint that can reliably stop water with a pipe connected to the pipe joint main body.

  In order to achieve the above object, the plug-in type pipe joint of the present invention includes a pipe joint body, a locking member having a locking claw for locking to the outer surface of a pipe housed and connected in the pipe joint body, In a plug-in type pipe joint having a water stop member for stopping water between an outer surface of the pipe to be stored inside the pipe joint body and the inner surface of the pipe joint body, the pipe joint body is connected. A pipe insertion main body provided with a large-diameter portion for accommodating the locking member and the water stop member on the tube insertion end side, and having a lumen portion penetrating in the axial direction from one end to the other end; and It has the relief part of the said water stop member in the back part of a large diameter part, It is characterized by the above-mentioned.

  According to the plug-in type pipe joint of the present invention thus configured, a pipe to be connected to the pipe joint body is inserted obliquely, and as a result, an unexpected force acts on the O-ring which is a water stop member. Even so, an O-ring escape portion, specifically a recessed portion, is provided at the back of the large-diameter portion drilled in the pipe joint body. You can escape to this escape. For this reason, unlike the conventional case, an abnormal situation in which a part thereof is bent inward and departs from a predetermined position does not occur. Therefore, the pipe to be connected is not connected while the O-ring is in an abnormal state, and water stoppage between the inner surface of the pipe joint main body and the outer surface of the connecting pipe can be reliably performed.

  As described above, according to the present invention, even if the pipe to be connected to the pipe joint main body is inserted obliquely, the O-ring which is a water stop member is partially recessed inside the pipe joint main body and is removed from the predetermined position. Therefore, it is possible to provide a plug-in type pipe joint that can reliably stop water with the pipe connected to the pipe joint main body without being in such a state.

  An embodiment of the plug-in type pipe joint of the present invention will be described in detail below with reference to FIG. In FIG. 1, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, the description of the same parts will be simplified, and only the points showing the features of the present invention will be described in detail.

FIG. 1 is a half sectional view of a pipe joint showing an embodiment of the plug-in pipe joint of the present invention.
As shown in FIG. 1, the plug-in type pipe joint of the present invention includes at least a pipe joint body 1 and a pipe that is housed in the large-diameter portion 10 of the pipe-joint body 1 and is inserted from the inlet side of the large-diameter portion 10. A substantially annular locking member 4 provided with a slit in the circumferential direction having a locking claw 3 locked to the outer surface of the pipe 2 to be formed, and the outer surface of the pipe 2 to be connected and the inner surface of the pipe joint body 1 It has an annular water-stopping member 5 that performs water-stopping in between, specifically an O-ring.

The pipe joint body 1 is provided with a lumen that penetrates along the axial direction from the insertion end side where the pipe 2 to be connected is inserted to the other end. The cavity portion penetrates from the insertion end (the right end portion of the pipe joint shown in FIG. 1) of the tube 2 to the large-diameter portion 10 described above, the medium-diameter portion 20 that houses the distal end portion of the tube 2 to be connected, and the other end. It consists of a small diameter part 30.
In the large diameter portion 10, the water stop member 5 made of an O-ring is provided at the innermost part, the washer 6, and the locking member 4 described above are stored in this order toward the insertion end of the tube 2. Yes.

  Further, the support collar 7 and the metal cap 8 cooperate with each other so that the water stop member 5, washer 6, and locking member 4 do not detach from the large diameter portion 10 of the pipe joint body 1. It is attached to the end. Specifically, the cap 8 covers one part of the support collar 7 so that the support collar 7 does not come off from the large-diameter portion 10 of the pipe joint body 1 at one end, and the other end is caulked on the outer surface of the pipe joint body 1. The pipe joint body 1 is integrated.

  Incidentally, the pipe joint body 1 is a cut product made of brass such as gun metal, and the washer 6 and the locking member 4 are molded products made of, for example, modified PPO (polyphenylene oxide). Further, the locking claw 3 embedded in the locking member 4 so that a part thereof is obliquely exposed inside the locking member 4 is made of, for example, a hard metal such as stainless steel.

  Also, the slit is provided in a part of the circumferential direction of the locking member 4 is the same as the conventional one shown in FIG. 2 described above, and when the tip of the pipe 2 is inserted into this pipe joint, The locking claw 3 of the locking member 4 bites into the outer surface of the pipe 2 so that the pipe 2 does not come out of the pipe joint. More specifically, the locking claw 3 is formed integrally with the locking member 4 by being inclined in the direction of biting by the outer surface of the tube 2 when the tube 2 is pulled out of the pipe joint.

  Further, the inner surface of the support collar 7 and the contact surface 40 with the locking member 4 are also tapered surfaces that are reduced in diameter toward the inlet side of the large-diameter portion 10 of the pipe joint body 1 as shown in FIG. When an external force is applied to the pipe 2 connected to the pipe joint so as to pull out the pipe 2 from the pipe joint, the locking member 4 having a slit in a part of the circumferential direction thereof has the taper. The diameter of the contact surface 40 is reduced by receiving a force inward in the radial direction. As a result, the locking claw 3 also receives a force inward in the radial direction and further bites into the outer surface of the pipe 2, and acts so that the pipe 2 becomes more difficult to come out of the pipe joint.

The feature of the plug-in type pipe joint according to the present invention is that, as shown in FIG. 1, the O-ring is provided at the back of the large-diameter portion 10 of the water-stopping member 5, that is, the pipe joint body 1 in which the O-ring is housed. As described above with reference to FIG. 4, there is an escape portion 70 for receiving an unexpected force generated when the distal end of the pipe 2 to be connected is inserted into the pipe joint body 1 obliquely rather than horizontally.
Specifically, an annular concave portion is provided at a position in the back of the large diameter portion 10 (the bottom surface of the large diameter portion 10) where the O-ring is accommodated.
It should be noted that when the O-ring is pushed by an unexpected force and escapes to the escape portion 70, it is desirable to have a rounded chamfer so that the escape portion 70 does not have a corner so that the O-ring surface cannot be damaged. .

In this way, if the water stop member 5, that is, the O-ring escape portion 70, is provided at the back of the large-diameter portion 10 of the pipe joint body 1, it is temporarily connected to the pipe joint body 1 from obliquely downward or obliquely upward. Even if the tip of the pipe 2 to be inserted may be inserted, the O-ring is a very slight recess, but it escapes into the escape 70 and from a predetermined position as has been a problem in the past. There will be no withdrawal.
As a result, since the pipe joint body 1 and the pipe 2 can be normally connected, both the water can be completely stopped and can be used with confidence over a long period of time.

  For comparison, ten plug-in pipe joints according to the present invention and ten conventional water-stop members 5 having no relief 70 are prepared, and each pipe joint body 1 is provided with an in-core 50 at the tip. The tube 2 was inserted obliquely from below, and the state of the O-ring housed inside the pipe joint body 1 was observed. The experiment was conducted by two panelists, and when one of the two persons had an abnormal O-ring position, it was judged as defective. As a result, 8 out of 10 pieces were defective in the conventional one, while no abnormality of the O-ring was observed in all of the pipe joints with a relief portion of the present invention.

  By the way, in the pipe joint in the embodiment described above, the large diameter portion 10 that houses the locking member 4 and the water stop member 5 in order from the insertion end side of the pipe 2 to be connected is sequentially connected to the large diameter portion 10. The inner diameter portion 20 that accommodates the distal end portion of the pipe 2 to be connected, and the small diameter portion 30 that is provided continuously to the middle diameter portion 20 and penetrates the other end of the pipe joint main body form a lumen portion. However, for example, when the pipe 2 is made of a material that does not easily deform, it is not necessary to dare to attach the in-core 50 to the tip of the pipe 2, and when it is determined that water stoppage only from the outer surface of the pipe 2 is sufficient. The inner diameter of the medium diameter portion 20 and the inner diameter of the small diameter portion 30 may be the same. In other words, in this case, the large-diameter portion 10 and the medium-diameter portion 20 that passes through the large-diameter portion 10 to the other end of the pipe joint main body and accommodates the distal end portion of the pipe 2 in this case. It can also be configured.

It is a half sectional view showing one example of the insertion type pipe joint of the present invention. FIG. 2A shows an example of a conventional plug-in pipe joint. FIG. 2A is a half cross-sectional view of the pipe joint, and FIG. 2B is a half cross-sectional view of a pipe tip connected to the pipe joint. FIG. 3 is a half cross-sectional view showing a state where the pipe joint and the pipe shown in FIGS. 2A and 2B are connected to each other. It is a schematic diagram which shows the problem in the conventional pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe fitting main body 2 Pipe 3 Locking claw 4 Locking member 5 Water stop member 6 Washer 7 Support collar 8 Cap 10 Large diameter part 20 Medium diameter part 30 Small diameter part 50 Incore 70 Escape part

Claims (1)

  A pipe fitting body, a locking member having a locking claw that locks to an outer surface of a pipe that is housed and connected inside the pipe fitting body, an outer surface of the pipe that is housed inside the pipe fitting body, and In a plug-in type pipe joint having a water stop member that performs water stop between the pipe joint main body inner surface, the pipe joint main body has the locking member and the water stop member on the pipe insertion end side to be connected. A pipe joint body provided with a large-diameter portion to be accommodated has a lumen portion that penetrates in the axial direction from one end to the other end, and has a relief portion for the water-stopping member at the back of the large-diameter portion. Plug-type pipe fittings characterized by

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