JP2009228699A - Double pipe joint - Google Patents

Abstract

An object of the present invention is to provide a highly reliable two-way joint that has a function of branching an inner pipe and an outer pipe into a joint itself and a function of connecting to the other pipe, respectively, so that the inner pipe and the outer pipe can be easily connected. Provide heavy pipe fittings.
A double pipe side first connection portion 21 connected to an inner pipe 11 and an outer pipe 12 respectively forming inner and outer flow paths 13 and 14 of the double pipe 10 and the outer flow path 14 communicate with each other. It has a second connection part 22 to which the counterpart pipe 16 is connected, and a flow path branch part 23 that branches the inner flow path 13 to the outside of the outer flow path 14, and the first connection part 21 and the second The connecting portion 22 and the flow path branching portion 23 constitute a seamless joint body integrally formed with resin.
[Selection] Figure 1

Description

  The present invention relates to a double pipe joint used to connect a double pipe in which an inner pipe and an outer pipe have a double structure and branch the pipe.

  The double pipe is a pipe having a coaxial double structure in which the outer pipe and the inner pipe are integrated, and the fluid passes not only through the inner pipe but also as a flow path between the inner pipe and the outer pipe. It is like that. In order to use such a double pipe in a piping system such as an automobile or mechanical equipment, the flow path in the inner pipe and the flow path between the inner pipe and the outer pipe are branched at the end of the double pipe. Dedicated joints are indispensable for connecting to the other party's piping.

Conventionally, joints used in this type of double pipe include those disclosed in Patent Document 1, for example.
In FIG. 9, the double pipe 100 is comprised from the outer tube | pipe 101 and the inner tube | pipe 102 inside it. The joint 2 has a shape bent in an L shape, and the end of the outer tube 101 is joined to one end of the joint 2. The inner tube 102 extends straight so as to pass through the through hole 7 formed in the curved portion of the joint 2, and the tube 3 is connected to the tip of the inner tube 102. In the joint 2, the outer tube 101 and the inner tube 102 are joined by brazing.
JP 2004-245393 A

  Conventionally, in joints used to divide double pipes, the joint body, inner pipe, and outer pipe are joined by brazing, so that not only manufacturing man-hours and costs are required, but also reliability with respect to sealing performance is achieved. There is a problem that it is low.

  Further, the branched pipe is not provided with a connection means for easily connecting the other party's pipe, and there is a problem that the actual connection work is troublesome.

  Therefore, the object of the present invention is to solve the problems of the prior art, have high reliability, have a function of branching the inner pipe and the outer pipe into the joint itself, and a function of connecting to the other pipe, respectively. And providing a double pipe joint that can be easily connected to an inner pipe and an outer pipe.

  In order to achieve the above-mentioned object, the present invention connects a double pipe in which inner and outer flow paths are formed concentrically, and connects the inner and outer flow paths to a branch destination counterpart pipe. In the joint, the first connecting portion on the double pipe side connected to the inner pipe and the outer pipe respectively forming the inner and outer flow paths of the double pipe, and the other pipe connected to the outer flow path are connected. 2 connection portions, and a flow passage branch portion that forms a branch flow passage that branches the inner flow passage to the outside of the outer flow passage, the first connection portion, the second connection portion, The flow path branching portion constitutes a seamless joint body integrally formed with resin.

  Further, in the present invention, the first connection portion is formed by coaxially forming an inner connection portion connected to the inner tube of the double tube and an outer connection portion connected to the outer tube, and the inner connection portion. And the flow path branching part are integrated to form the branch flow path, and the branching part and the outer connection part form an integral double structure.

  According to a preferred embodiment of the present invention, the inner connecting part and the outer connecting part of the first connecting part are bamboo shoot-shaped, which are press-fitted to the inner pipe and the outer pipe of the resin double pipe, respectively. It is comprised as a press-fit connection part which has the outer peripheral part in which the unevenness | corrugation was formed.

  Moreover, according to a preferred embodiment of the present invention, the inner tube and the outer tube of the resin double pipe are welded to the inner connection portion and the outer connection portion of the first connection portion, respectively.

  According to the present invention, the joint itself has a function of branching the inner pipe and the outer pipe and a function of connecting to the other pipe, respectively, and the connection to the inner pipe and the outer pipe can be easily performed, and the reliability is high. Can be a thing.

Hereinafter, embodiments of a double pipe joint according to the present invention will be described with reference to the accompanying drawings.
First embodiment
FIG. 1 is a longitudinal sectional view showing a double pipe joint according to a first embodiment of the present invention. In FIG. 1, reference numeral 10 indicates a double pipe, and reference numeral 20 indicates the entire double pipe joint according to the present embodiment. The double tube 10 is a resin tube in which the inner tube 11 and the outer tube 12 have a concentric double structure. In this double pipe 10, an inner flow path 13 is formed by the inner pipe 11, and an outer flow path 14 is formed by the outer peripheral surface of the inner pipe 11 and the inner peripheral surface of the outer pipe 12.

  In FIG. 1, reference numeral 15 is a counterpart tube communicating with the inner flow path 13, and 16 is a counterpart tube communicating with the outer flow path 14. The double pipe joint 20 is a joint for branching the inner pipe 11 and the outer pipe 12 of the double pipe 10 so that they can be connected to the tubes 15 and 16, respectively.

  The double pipe joint 20 of the present embodiment is roughly divided into a first connection part 21 connected to the terminal of the double pipe 10 and a second terminal to which the terminal of the tube 16 communicating with the outer flow path 14 is connected. The connection part 22 and each part of the flow path branching part 23 are configured, and the first connection part 21, the second connection part 22, and the flow path branching part 23 constitute a seamless joint body integrally formed with resin. It has become.

  First, the 1st connection part 21 of the double pipe coupling 20 is demonstrated. In the first connection portion 21, the inner connection portion 24 and the outer connection portion 25 are formed coaxially. Among these, the inner side connection part 24 is connected by press-fitting into the terminal of the inner pipe 11 of the double pipe 10. Similarly, the outer connection portion 25 is connected by being press-fitted into the outer tube 12 of the double tube 10. In the 1st connection part 21, the inner side connection part 24 and the branch part 23 are united, and the branch flow path 23a is formed.

  Next, FIG. 2 shows a II-II cross section in FIG. As shown in FIG. 2, the branch portion 23 and the outer connection portion 25 form an integral double tube structure.

  As shown in FIG. 1, the inner connection portion 24 of the first connection portion 21 is configured as a press-fit connection portion having an outer peripheral portion in which irregularities are formed in a bamboo shoot shape. It is connected to the terminal of the inner pipe 11 by press-fitting. Similarly, the outer connection portion 25 is also configured as a bamboo shoot shaped press-fit connection portion, and is connected to the end of the outer tube 12 of the double pipe 10 by press-fitting. In this case, in the double pipe 10, the step between the end surfaces of the inner pipe 11 and the outer pipe 12 corresponds to the step between the inner connection portion 24 and the outer connection portion 25, so that it can be press-fitted at a time.

  In this embodiment, the connection port of the flow path branching portion 23 is integrally provided with a quick connector type terminal portion 26. The quick connector type terminal portion 26 has a known quick connector structure in which the spool portion 15a of the branch destination tube 15 is restrained by the claw 27a of the retainer 27.

  In addition, as shown in FIG. 3, you may make it use the quick connector type | mold terminal part 30 of the form which inserts the retainer 29 from this radial direction for this quick connector type | mold terminal part 26. As shown in FIG.

  Similarly, the 2nd connection part 22 is comprised as the quick connector type | mold terminal part 31, and the structure of the well-known quick connector which restrains the spool part 16a of the other party tube 16 with the nail | claw 32a of the retainer 32 is utilized. Yes.

According to 1st Embodiment comprised as mentioned above, the following effects are obtained.
As shown in FIG. 1, the inner connecting portion 24 is press-fitted into the inner tube 11 of the double tube 10, and the outer connecting portion 25 is press-fitted into the outer tube 12. On the other hand, the branch destination tubes 15 and 16 can be connected by being inserted into the quick connector type terminal portions 26 and 31, respectively. Since the joint itself has a function of branching the inner pipe 11 and the outer pipe 12 and a function of connecting to the other pipe, the inner pipe 11 and the outer pipe 12 of the double pipe 10 are branched. Therefore, it is possible to easily connect to the branch destination tubes 15 and 16 with one touch.

  In addition, since the first connecting portion 21, the second connecting portion 22, and the flow path branching portion 23 can form a joint body with a seamless resin molding, the joint structure is simple and highly reliable. It can be.

Second embodiment
Next, a double pipe joint according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same reference numerals as those in FIG. 1 denote the same components.

In the second embodiment, a male pipe terminal portion 33 having a spool portion 33a is integrally provided at the connection port of the flow path branching portion 23, and the second connection portion 22 is similarly spooled. A male tube terminal portion 37 having a portion 37a is integrally provided. Therefore, each of the tube terminal shape portions 33 and 37 is connected to the other tube to which the quick connector is attached.
According to the second embodiment as described above, the structure of the double pipe joint is simplified, and a highly reliable joint can be obtained.

Third embodiment
Next, FIG. 5 is a sectional view showing a pipe joint for a double pipe according to a third embodiment of the present invention. In the third embodiment, either the male pipe terminal portion 33 or the quick connector type terminal portion 35 can be selectively welded to the connection port 34 of the flow path branching portion 23.

  According to the third embodiment as described above, there is an advantage that the degree of freedom in design according to the counterpart to be connected is increased, and versatility can be improved.

Fourth embodiment
Next, a double pipe joint according to a fourth embodiment of the present invention will be described with reference to FIG.
In the first to third embodiments described so far, both the inner connection portion 24 and the outer connection portion 25 of the first connection portion 21 are of the type connected to the double pipe 10 by press fitting. In the embodiment, the double pipe 10 is directly welded to the first connection portion 21. The rest of the configuration is the same as that of the first embodiment of FIG. 1, and the same reference numerals are assigned to the same components, and detailed description thereof is omitted.

  In FIG. 7, a groove 40 having a depth in the axial direction is formed on the inner connection portion 24 of the first connection portion 21 over the entire circumference so that the end of the inner tube 11 of the double tube 10 can be fitted. Has been. Similarly, a groove 42 into which the end of the outer tube 12 of the double tube 10 can be fitted is formed in the outer connection portion 25 over the entire circumference.

  As shown in FIG. 8, in the four embodiments, the flow path branching portion 23 continuing to the inner connecting portion 24 is coaxial with the inner side of the outer connecting portion 25 via a plurality of ribs 44 extending in the radial direction. Constructs a double pipe structure.

  When the double pipe 10 is connected to the first connection part 21 as described above, the end of the inner pipe 11 of the double pipe 10 is inserted into the groove 40 of the inner connection part 24 and the end of the outer pipe 12 is connected to the outer side. It inserts in the groove | channel 42 of the connection part 25, and each is welded. In this case, in the double tube 10, the step between the end surfaces of the inner tube 11 and the outer tube 12 corresponds to the step between the inner connecting portion 24 and the outer connecting portion 25, so that the inner tube 11 and the outer tube 12 are simultaneously grooved 40. , 42 and can be welded.

  According to 4th Embodiment comprised as mentioned above, compared with 1st thru | or 3rd Embodiment, as a whole, the length of the double pipe joint 20 is shortened as much as there is no press-fit connection part. A compact configuration can be achieved.

  In FIG. 6, an example in which the quick connector type terminal portion 31 is provided in the second connection portion 22 and the quick connector type terminal portion 35 is also integrally provided in the connection port of the branch portion 23 is described. Of course, there is a degree of freedom in design such as a quick connector type terminal 30 as shown in FIG. 3 and a male pipe terminal portion 33 as shown in FIG.

It is a longitudinal cross-sectional view of the double pipe pipe joint by 1st Embodiment of this invention. It is the II-II sectional view taken on the line of the pipe joint for double pipes in FIG. It is a side view which shows the example of the quick connector type | mold terminal part used for the pipe joint for double pipes by 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the double pipe pipe joint by 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the double pipe pipe joint by 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the double pipe pipe joint by 4th Embodiment of this invention. Sectional drawing which shows the principal part of the 1st connection part in a double pipe coupling. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 6 of the double pipe joint. It is a longitudinal cross-sectional view which shows the double pipe coupling by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double pipe 11 Inner pipe 12 Outer pipe 15 Tube 16 Tube 20 Double pipe joint 21 1st connection part 22 2nd connection part 23 Flow path branch part 24 Inner connection part 25 Outer connection part 26 Quick connector type terminal part 31 Quick Connector type terminal

Claims (9)

In the double pipe joint for connecting the inner / outer flow path to the other pipe at the branch destination, connecting the inner / outer flow path to the double pipe formed concentrically,
A first connecting portion on the double pipe side connected to the inner pipe and the outer pipe forming the inner and outer flow paths of the double pipe, respectively;
A second connecting portion to which a counterpart pipe communicating with the outer flow path is connected;
A channel branching portion for branching the inner channel to the outside of the outer channel;
Have
The double pipe joint, wherein the first connection part, the second connection part, and the flow path branch part constitute a seamless joint body integrally formed with resin.   In the first connection part, an inner connection part connected to the inner pipe of the double pipe and an outer connection part connected to the outer pipe are formed coaxially, and the inner connection part and the flow path branching part are formed. The double pipe joint according to claim 1, wherein the branch passage and the outer connection part form an integral double pipe structure.   The inner connection portion and the outer connection portion of the first connection portion are press-fit having an outer peripheral portion in which unevenness is formed in a bamboo shoot shape that is press-fitted and connected to the inner tube and the outer tube of the resin double tube, respectively. It is a connection part, The double pipe coupling of Claim 2 characterized by the above-mentioned.   The double pipe joint according to claim 2, wherein the second connection portion has a housing-type terminal shape of a quick connector.   The double pipe joint according to claim 4, wherein a housing-type terminal shape of a quick connector is integrally provided at a connection port of the flow path branching portion.   3. The double pipe joint according to claim 2, wherein the second connection portion has a shape of a mating pipe end connected to a quick connector.   7. The double pipe joint according to claim 6, wherein the other end of the pipe connected to the quick connector is integrally provided at the connection port of the flow path branching section.   3. The double pipe according to claim 2, wherein an inner pipe and an outer pipe terminal of the resin-made double pipe are welded to the inner connection portion and the outer connection portion of the first connection portion, respectively. Fittings.   The connection port of the flow path branching section can be joined by selecting any joint component from a plurality of types of joint components for connecting to a branch destination counterpart pipe. Double pipe fittings.

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