JPH0665689U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] The fitting state of a pipe to be connected to a pipe joint can be visually confirmed, and furthermore, the fitting of the pipe to be connected to the pipe joint can be achieved as specified. [Structure] A synthetic resin pipe 1 is externally fitted to and bonded to a synthetic resin pipe joint body 3, and the pipe joint body 3
An annular ridge 4 for defining the fitting margin L of the synthetic resin pipe 1 with respect to the pipe joint body 3 is provided on the outer surface of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for connecting a synthetic resin pipe such as a hard vinyl chloride or a copper pipe.

[0002]

[Prior art]

 The above-mentioned synthetic resin pipes and copper pipes are widely used as pipes for building equipment, and synthetic resin and copper pipe joints used to connect these pipes include socket type, elbow type and other cheese types. Type and cross type.

The connection form of the synthetic resin pipe and the copper pipe to the pipe joint will be described by taking the socket type pipe joint as an example. First, in the case of the synthetic resin pipe, as shown in FIG. Adhesives are applied to the outer surface of the pipe 11 and the inner surface of the pipe joint 12, respectively, so that the synthetic resin pipe 11 is fitted into the pipe joint 12 by adhesive connection. As shown, the copper pipe 13 is fitted in the pipe joint 14 to form a so-called brazing connection in which the brazing material is melted between the two members 13, 14.

What is important here is that the fitting allowance of the pipes 11, 13 to be connected to the pipe joints 12, 14 should be as specified, in order to maintain the tensile strength at the connection part in a necessary and sufficient manner. Therefore, the pipe joints 12 and 14 are provided with an annular ridge 15 at the center of their inner surfaces for defining the required fitting margin of the pipe to be connected. It is considered that a predetermined fitting allowance can be obtained by bringing the pipe end portion into contact with or close to the shape portion 15.

[0005]

[Problems to be solved by the device]

 However, it is possible to visually check whether or not the pipe ends fitted inside the pipe joints 12 and 14 come into contact with the ridges 15 or whether a predetermined fitting margin is taken even if they do not come into contact with each other. It is impossible to confirm by the above, and as shown in the pipes 11 and 12 shown on the right side of FIGS. 8 and 9, even though a predetermined amount of fitting is not actually achieved, the pipe is inserted. It was mistaken for the connection to be normal, and due to insufficient mating, it became impossible to obtain sufficient tensile strength at the connection part.For example, when the impact pressure of a water hammer was received or the impact pressure was Repeatedly receiving the pipes 11 and 13 at the connecting portion may cause a large amount of water leakage accidents.

The present invention has been made in view of such circumstances, and it is possible to determine whether or not a predetermined fitting margin has been taken by adopting a rational fitting form which is completely different from the conventional one. Its purpose is to provide a pipe joint that can be visually confirmed.

[0007]

[Means for Solving the Problems]

 A pipe joint according to a first aspect of the present invention that has achieved the above object is a pipe joint made of synthetic resin for adhesively connecting a synthetic resin pipe, and the synthetic resin pipe is externally fitted and attached. A structural feature is that an outer surface of the pipe joint body is provided with an annular ridge for determining the fitting margin of the synthetic resin pipe to the pipe joint body.

A pipe joint according to a second invention is a copper pipe joint for brazing and connecting a copper pipe, wherein the copper pipe is externally fitted to the outer surface portion of the pipe joint body to be brazed, The structural feature is that an annular ridge is provided to define the fitting margin of the copper pipe to the pipe joint body.

[0009]

[Action]

 In any of the characteristic configurations of the first and second inventions, the fitting state of the pipe to be connected with the pipe joint can be visually confirmed, and the pipe joint is based on the ridge provided on the pipe joint body. By controlling the end insertion position of the pipe externally fitted to the main body, the fitting of the pipe to be connected to the pipe joint is achieved as specified.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a socket type pipe joint 2 made of synthetic resin corresponding to the first invention in which the synthetic resin pipe 1 is connected. The pipe joint 2 is made by fitting the synthetic resin pipe 1 to the outside to make an adhesive connection. It is characterized in that it is configured so that the synthetic resin pipe 1 preliminarily defined by the pipe diameter is provided at the center of the outer surface of the straight pipe fitting body 3 into which the synthetic resin pipe 1 is fitted. An annular ridge 4 is provided with a fitting margin L, and rounded chamfers r are applied to the inner and outer corners of both ends of the pipe joint body 3.

In the above structure, an adhesive is applied to each of the end-side inner surface of the synthetic resin pipe 1 to be connected and the end-side outer surface of the pipe joint body 3, and as shown in FIG. The pipe 1 is externally fitted to the pipe joint main body 3 to be adhesively connected. At this time, since the outer corners of both ends of the pipe joint main body 3 are chamfered to be rounded, the composite pipe for the pipe joint main body 3 is combined. The resin pipe 1 can be easily fitted.

Then, the end portion of the synthetic resin pipe 1 is brought into contact with the ridge portion 4, or even if the end portion is not brought into contact with the ridge portion 4, the size of the gap a can be controlled based on a predetermined fitting margin L. For example, the fitting of the synthetic resin pipe 1 to the pipe joint 2 can be reliably achieved according to the regulation, and the fitting condition can be visually confirmed.

[0013] Thus, since the fitting as specified is surely achieved, the tensile strength at the connection portion can be sufficiently obtained, and the synthetic resin pipe 1 can be pulled out by the impact pressure of the water hammer, for example. As a result, a large amount of water leakage accidents can be reliably prevented. The inner angles of both ends of the pipe joint body 3 are chamfered to be rounded in order to reduce the fluid resistance due to the ends of the pipe joint body 3.

FIG. 3 shows a synthetic resin elbow type pipe joint 2 corresponding to the first invention in which a synthetic resin pipe 1 is connected, and FIG. 4 shows a cheese type pipe joint 2. In both cases, with the fitting margin L of the synthetic resin pipe 1 provided, the pipe joint main body 3 is provided with an annular ridge 4 and the inner and outer angles of each end of the pipe joint main body 3 are chamfered. It is also possible to adopt a configuration in which the ridge portion 4 is integrated by the thick portion b as shown by an imaginary line.

It is obvious that any of the pipe joints 2 shown in FIGS. 3 and 4 exerts the same action and effect as the pipe joint 2 shown in FIG. To do.

FIG. 5 shows a copper socket type pipe joint 6 corresponding to the second invention in which the copper pipe 5 is to be connected. The pipe joint 6 is brazed by externally fitting the copper pipe 5. The present invention is characterized in that it is configured so that the fitting allowance L of the copper pipe 5 defined in advance by the pipe diameter is provided at the center of the outer surface of the straight pipe fitting body 7 into which the copper pipe 5 is fitted. In this state, the annular ridge portion 8 is swelled in a state in which the outer corners of the pipe joint body 7 are chamfered.

In such a configuration, the copper pipe 5 is fitted outside the pipe joint body 7 with the brazing material interposed between the copper pipe 5 to be connected and the pipe joint body 7. Then, the brazing material is melted to connect the copper pipe 5 to the pipe joint body 7 by what is called brazing. At this time, since the outer corners of both ends of the pipe joint body 7 are chamfered to be round, The copper pipe 5 can be easily fitted into the pipe joint body 7.

As with the pipe joint 2 according to the first invention, the copper pipe joint 6 is also provided with the ridge portion 8 with a predetermined fitting margin L. If the end portion of the copper pipe 5 is brought into contact with the pipe 8, or if the size of the gap a is controlled based on a predetermined fitting margin L 1 even if the copper pipe 5 is not brought into contact with the pipe pipe 5, Since the fitting is achieved according to the regulation, and the tensile strength at the connection part is obtained sufficiently, for example, a water leakage accident accompanying the pulling out of the copper pipe 5 due to the impact pressure of the water hammer, etc. Is reliably prevented. Of course, the fitting condition of the copper pipe 5 to the pipe joint 6 can also be visually confirmed.

Although the inner angles of both ends of the pipe joint body 7 are not chamfered into a round shape, this is because the pipe joint body 7 is thin and the end portions of the pipe joint body 7 are almost free from the resistance of fluid. This is because it does not occur, or the inner corner of the end may be chamfered to a radius if necessary.

FIG. 6 shows a copper elbow type pipe joint 6 corresponding to the second invention in which a copper pipe 5 is connected, and FIG. 7 shows a cheese type pipe joint 6, both of which are shown in FIG. In a state in which the fitting allowance L of the copper pipe 5 is provided, the annular ridge portion 8 is bulged in the pipe joint body 7, and the outer angle of each end portion of the pipe joint body 7 is chamfered to be rounded. .

It is obvious that any of the pipe joints 6 shown in FIGS. 6 and 7 exerts the same action and effect as the pipe joint 6 shown in FIG. To do. The configuration in which the ridge portion is provided in the cross type pipe joint is omitted because it can be easily estimated based on the cheese type pipe joints 2 and 6 shown in FIGS.

[0022]

[Effect of device]

 As described above, in both the first and second inventions, the fitting state of the pipe to be connected with the pipe joint can be visually confirmed. Moreover, if the end of the pipe to be connected is brought into contact with the ridge, or if the clearance between the pipe end and the ridge is controlled based on the predetermined fitting margin, The fitting of the pipe to be connected to the joint is achieved as specified, and by adopting a rational fitting form that is completely different from the conventional one, the tensile strength at the connection part is necessary and sufficient. As a result, it has become possible to reliably prevent a water leakage accident due to the pipe coming off due to, for example, the impact pressure of a water hammer.

[Brief description of drawings]

FIG. 1 is a side view of an upper half of a socket type synthetic resin pipe joint corresponding to the first invention in section.

FIG. 2 is a side view showing an upper half of a cross section of a synthetic resin pipe connected to the pipe joint of FIG.

FIG. 3 is a sectional view of an elbow type pipe joint corresponding to the first invention.

FIG. 4 is a sectional view of a cheese type pipe joint corresponding to the first invention.

FIG. 5 is a side view of the upper half showing a connection state of copper pipes by a socket type copper pipe joint corresponding to the second invention.

FIG. 6 is a sectional view of an elbow type pipe joint corresponding to the second invention.

FIG. 7 is a cross-sectional view of a cheese type pipe fitting corresponding to the second invention.

FIG. 8 is a side view in which the upper half shows a connection state of a synthetic resin pipe to a conventional synthetic resin pipe joint.

FIG. 9 is a side view in which the upper half shows a connection state of a copper pipe to a conventional copper pipe joint.

[Explanation of symbols]

1 ... Synthetic resin pipe, 3, 7 ... Pipe joint body, 4, 8 ... Ridge portion, 5 ... Copper pipe, L ... Fitting allowance.

Claims (2)

[Scope of utility model registration request] 1. A pipe joint made of synthetic resin for adhesively connecting a synthetic resin pipe, wherein the outer surface portion of the pipe joint body to which the synthetic resin pipe is externally fitted and adhered is combined with the pipe body. A pipe joint provided with an annular ridge for defining a fitting margin of a resin pipe. 2. A copper pipe joint for brazing and connecting a copper pipe, wherein a copper pipe for the pipe joint body is attached to an outer surface of the pipe joint body to which the copper pipe is externally fitted and brazed. A pipe joint having an annular ridge for defining a fitting margin.