JP6402943B2 - Inner pipe joint and piping system - Google Patents

Description

  The present invention relates to an inner pipe joint and a piping system of a double pipe joint to which a double pipe composed of an inner pipe and an outer pipe is connected, to which the inner pipe is connected.

  Conventionally, as this type of double pipe joint, there has been known a T-shaped joint that is formed in a “T” shape as a whole, and has an outer pipe connection port and an inner pipe connection port formed on the front side, the front side, and the branch side, respectively. (See Patent Document 1). Each inner pipe connection port is connected to an inner pipe of each hot water supply double pipe via a stainless steel joint pipe, and each outer pipe connection port is connected to an outer pipe of each hot water supply double pipe, respectively. Welded and connected. As a result, the inner pipes and the outer pipes of the three hot water supply double pipes are connected to each other. In a piping system using this type of double pipe joint, this type of double pipe joint and a double pipe joint are used in which the inside of the inner pipe is the hot water supply forward flow path and the gap between the inner pipe and the outer pipe is the hot water supply return flow path. A reverse / return hot water supply pipe is constituted by the pipe (straight pipe).

Japanese Patent No. 4168315

By the way, in this type of piping system, various types of double pipe joints such as straight joints (for example, sockets) and L-shaped joints (for example, elbows) are used as the double pipe joints in addition to the conventional T-shaped joints. Is done. Moreover, since the double pipe of the piping system corresponding to a large building requires the thing of various pipe diameters, the double pipe joint according to pipe diameter is needed according to this. Therefore, in order to construct a piping system, it is necessary to prepare a large number of special and complicated pipe joints called double pipe joints according to form and pipe diameter, which is against resource saving. .
In addition, the conventional double pipe joint has a configuration in which the inner pipe is connected to the inner pipe connection port via the joint pipe, so that the connection work is complicated and the joint pipe located outside the inner pipe is not provided. This hinders the flow path outside the inner tube, and it is difficult to secure a sufficient flow path outside the inner tube.

  It is an object of the present invention to provide an inner pipe joint and a piping system that can achieve resource saving, can be easily connected, and can secure a sufficient flow path outside the inner pipe. .

The first inner pipe joint of the present invention is a straight type that linearly connects double pipes composed of an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipes. An inner pipe joint of a double pipe joint that is disposed inside an outer pipe joint that connects the outer pipes and connects the inner pipes, the first inner pipe connecting the inner pipes of one of the double pipes. comprising a tube connection port, and a second inner tube connection port for connecting the inner tube of the other of the double tube, and each inner pipe connecting port, have a connection allowance each inner tube is inserted into the outside, The first inner pipe connection port and the second inner pipe connection port are integrally formed, and the connection cost of the second inner pipe connection port is equal to one of the connection cost of the first inner pipe connection port. In a state where the inner pipe of the pipe is inserted, it is formed so as to protrude from the outer pipe joint connected to the outer pipe of one of the double pipes .

According to this configuration, the double pipe joint is divided into an outer pipe joint and an inner pipe joint, and the inner pipe joint of the double pipe joint composed of the outer pipe joint and the inner pipe joint has a connection allowance for inserting the inner pipe to the outside. Therefore, the existing pipe joint for a single pipe can be used as a part of the double pipe joint (outer pipe joint). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved.
In addition, since the inner pipe is connected to the outside of the connection allowance, the inner pipe can be easily connected and the flow path outside the inner pipe is not obstructed, and the outer pipe is placed outside the inner pipe. A sufficient flow path can be secured.
Further, in a state where one double pipe is connected to the inner pipe joint and the outer pipe joint, the connection allowance of the inner pipe connection port for connecting the inner pipe of the other double pipe protrudes from the outer pipe joint. Therefore, after connecting the inner pipe joint and the outer pipe joint to one double pipe, it becomes easy to connect the inner pipe of another double pipe to the inner pipe connection port.

The second inner pipe joint of the present invention has an “L” shape that vertically couples double pipes composed of an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipes. Of the double pipe joint, the inner pipe joint that is disposed inside the outer pipe joint that connects the outer pipes and connects the inner pipes, and that connects the inner pipes of one of the double pipes. An inner pipe connection port and a second inner pipe connection port for connecting the inner pipe of the other double pipe, and each inner pipe connection port has a connection allowance for inserting each inner pipe to the outside thereof. The first inner pipe connection port and the second inner pipe connection port are formed separately and are configured to be joinable in the outer pipe joint .

According to this configuration, the double pipe joint is divided into an outer pipe joint and an inner pipe joint, and the inner pipe joint of the double pipe joint composed of the outer pipe joint and the inner pipe joint has a connection allowance for inserting the inner pipe to the outside. Therefore, the existing pipe joint for a single pipe can be used as a part of the double pipe joint (outer pipe joint). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved.
In addition, since the inner pipe is connected to the outside of the connection allowance, the inner pipe can be easily connected and the flow path outside the inner pipe is not obstructed, and the outer pipe is placed outside the inner pipe. A sufficient flow path can be secured.

In this case, the connection allowance of the second inner tube connection port is such that the inner tube of one double tube is inserted into the connection allowance of the first inner tube connection port and the second inner tube connection port is connected to the first inner tube. In a state of being joined to the connection port, it is preferably formed so as to protrude from the outer pipe joint connected to the outer pipe of the one double pipe.

According to this configuration, in the state where one double pipe is connected to the inner pipe joint and the outer pipe joint, the connection allowance of the inner pipe connection port for connecting the inner pipe of the other double pipe protrudes from the outer pipe joint. To do. Therefore, after connecting the inner pipe joint and the outer pipe joint to one double pipe, it becomes easy to connect the inner pipe of another double pipe to the inner pipe connection port.

The third inner pipe joint of the present invention is composed of two double pipes composed of an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipes. The pipe is arranged in a straight line, inside the outer pipe joint that connects the outer pipes of the “T” -shaped double pipe joint that connects one double pipe perpendicularly to two double pipes. An inner pipe joint for connecting the inner pipes to each other, the first inner pipe connection port and the second inner pipe connection port for connecting the two double pipes to each other, and one double pipe connected to each other A first inner pipe connection port and a second inner pipe connection port. Each of the inner pipe connection ports has a connection allowance for inserting each inner pipe to the outside thereof. Is formed integrally, and the third inner pipe connection port is configured so as to be capable of being joined in the outer pipe joint to the integrated body of the first inner pipe connection port and the second inner pipe connection port. Characterized in that that.

According to this configuration, the double pipe joint is divided into an outer pipe joint and an inner pipe joint, and the inner pipe joint of the double pipe joint composed of the outer pipe joint and the inner pipe joint has a connection allowance for inserting the inner pipe to the outside. Therefore, the existing pipe joint for a single pipe can be used as a part of the double pipe joint (outer pipe joint). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved.
In addition, since the inner pipe is connected to the outside of the connection allowance, the inner pipe can be easily connected and the flow path outside the inner pipe is not obstructed, and the outer pipe is placed outside the inner pipe. A sufficient flow path can be secured.

In this case, the connection allowance of the second inner tube connection port is the outer tube joint connected to the outer tube of the double tube in the state where the inner tube of the double tube is inserted into the connection allowance of the first inner tube connection port. It is preferable to form so that it may protrude from.

In these cases, the connection allowance of the third inner pipe connection port is a state in which the inner pipe of the double pipe is inserted into the connection allowance of the first inner pipe connection port, and the third inner pipe connection port is joined to the integrated object. In this case, it is preferable that the outer pipe joint is formed so as to protrude from the outer pipe joint connected to the outer pipe of the double pipe.

According to these configurations, in a state where one double pipe is connected to the inner pipe joint and the outer pipe joint, the connection allowance of the inner pipe connection port for connecting the inner pipe of the other double pipe is reduced from the outer pipe joint. Protruding. Therefore, after connecting the inner pipe joint and the outer pipe joint to one double pipe, it becomes easy to connect the inner pipe of another double pipe to the inner pipe connection port.

In the fourth inner pipe joint of the present invention, a double pipe composed of an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipe and two single pipes are connected. A double pipe joint that connects the inner pipe to one single pipe and the outer pipe to the other single pipe, and is disposed inside the outer pipe joint in which the outer pipe and the two single pipes are connected; An inner pipe joint to which the inner pipe is connected, which is connected to the inner pipe connection port for connecting the inner pipe and the inner pipe connection port, and the inner pipe connection port is connected to one single pipe connected to the outer pipe joint. The inner pipe connection port has a connection allowance into which the inner pipe is inserted to the outside, and the communication member is connected to the single pipe abutting portion where the end face of one single pipe in the outer pipe joint abuts. It has a flange portion that is seated and sandwiched between the single tube abutting portion and the end surface of one single tube.

The fifth inner pipe joint of the present invention includes a double pipe comprising an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipe and a connecting pipe for a water supply or hot water supply terminal. An inner pipe joint that is disposed inside the outer pipe joint to which the outer pipe and the lead-in pipe are connected and to which the inner pipe is connected, and is connected to the inner pipe. A connecting member that communicates with the connecting port and the inner tube connecting port, and communicates the inner tube connecting port with the connecting tube connected to the outer tube joint, and the inner tube is inserted outside the inner tube connecting port. The connecting member has a flange portion that is seated on the abutting portion where the end surface of the connecting tube in the outer tube joint abuts and is sandwiched between the abutting portion and the end surface of the connecting tube. It is characterized by.

According to these configurations, the double pipe joint is divided into an outer pipe joint and an inner pipe joint, and the inner pipe joint of the double pipe joint composed of the outer pipe joint and the inner pipe joint is inserted into the outer pipe. By adopting a structure having a margin, an existing single pipe pipe joint can be used as a part of the double pipe joint (outer pipe joint). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved.
In addition, since the inner pipe is connected to the outside of the connection allowance, the inner pipe can be easily connected and the flow path outside the inner pipe is not obstructed, and the outer pipe is placed outside the inner pipe. A sufficient flow path can be secured.

In these cases, the inner pipe connection port further includes an inner pipe abutting portion that abuts the end surface of the inner pipe inserted into the connection allowance and regulates the position of the inner pipe. It is preferable to regulate the position of the inner pipe so that the end face of the applied inner pipe is located inside or at the same position as the end face of the outer pipe connected to the outer pipe joint.
According to this configuration, it is possible to use a double tube in which the end surface of the inner tube protrudes from the end surface of the outer tube, or a double tube in which the end surface of the inner tube and the end surface of the outer tube are flush with each other. That is, it is possible to avoid the use of a double tube in which the end surface of the inner tube enters the inner side of the end surface of the outer tube. Therefore, the inner pipe can be easily connected to the inner pipe connection port.

The piping system of the present invention is characterized by comprising the above-mentioned double pipe joint comprising an inner pipe joint and an outer pipe joint, and a double pipe comprising an inner pipe and an outer pipe.
According to this configuration, the double pipe joint is divided into an outer pipe joint and an inner pipe joint, and the inner pipe joint of the double pipe joint composed of the outer pipe joint and the inner pipe joint has a connection allowance for inserting the inner pipe to the outside. Therefore, the existing pipe joint for a single pipe can be used as a part of the double pipe joint (outer pipe joint). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved.
In addition, since the inner pipe is connected to the outside of the connection allowance, the inner pipe can be easily connected and the flow path outside the inner pipe is not obstructed, and the outer pipe is placed outside the inner pipe. A sufficient flow path can be secured.

  In the above piping system, it is preferable that the inner pipe and the outer pipe are both resin pipes, and the outer pipe joint is a resin joint.

  According to this configuration, it is possible to provide an inexpensive and highly corrosion-resistant piping system by using resin-made inner tubes, outer tubes, and outer tube joints.

  In this case, it is preferable that the outer tube is two sizes larger than the inner tube in the nominal diameter.

  According to this structure, the balance (volume balance) of the cross-sectional areas of the two flow paths configured by the inside of the inner tube and the gap between the inner tube and the outer tube can be made an appropriate balance. For example, even when one of the two flow paths is a forward flow path and the other is a return flow path, there is no extreme difference in cross-sectional area between the forward flow path and the return flow path.

(A) is sectional drawing which showed the double pipe, (b) is sectional drawing which showed the double pipe socket which concerns on 1st Embodiment, (c) is the outside of a double pipe socket It is the fragmentary sectional view which showed the pipe joint, (d) is the fragmentary sectional view which showed the inner pipe joint of the double pipe socket. It is explanatory drawing which showed construction operation of the double tube socket. (A) is sectional drawing which showed the double pipe elbow which concerns on 2nd Embodiment, (b) is the fragmentary sectional view which showed the outer pipe joint of the double pipe elbow, (c), It is the fragmentary sectional view showing the inner pipe joint of a double pipe elbow. It is explanatory drawing which showed construction operation of the double pipe elbow. (A) is sectional drawing which showed the double pipe cheese which concerns on 3rd Embodiment, (b) is the fragmentary sectional view which showed the outer pipe joint of double pipe cheese, (c), It is the fragmentary sectional view showing the inner pipe joint of double pipe cheese. It is explanatory drawing which showed the first half part of construction operation of double tube cheese. It is explanatory drawing which showed the latter half part of construction operation | movement of double tube cheese. (A) is sectional drawing which showed the double pipe branch joint which concerns on 4th Embodiment, (b) is the fragmentary sectional view which showed the outer pipe joint of the double pipe branch joint, (c) These are the fragmentary sectional views which showed the inner pipe joint of the double pipe branch joint. (A) is sectional drawing which showed the double pipe adapter coupling which concerns on 5th Embodiment, (b) is the fragmentary sectional view which showed the outer pipe joint of the double pipe adapter coupling, (c) These are the fragmentary sectional views which showed the inner pipe joint of the double pipe adapter coupling. It is the system figure which showed the hot water supply piping system using a double pipe socket, a double pipe elbow, a double pipe cheese, a double pipe branch joint, and a double pipe adapter joint. (A) is sectional drawing which showed the modification of the double tube socket, (b) is the front view which showed the positioning member periphery of the double tube socket.

  Hereinafter, an inner pipe joint and a piping system according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the first embodiment, a double pipe socket to which the first inner pipe joint of the present invention is applied is illustrated, and in the second embodiment, a double pipe elbow to which the second inner pipe joint of the present invention is applied is illustrated. In the third embodiment, a double pipe cheese is illustrated by applying the third inner pipe joint of the present invention, and in the fourth embodiment, the double pipe to which the fourth inner pipe joint of the present invention is applied. A branch joint is illustrated, and in the fifth embodiment, a double pipe adapter joint to which the fifth inner pipe joint of the present invention is applied is illustrated. Here, before describing each embodiment, the double pipe used as connection object in each embodiment is demonstrated.

  As shown in FIG. 1A, the double pipe 10 includes an inner pipe 11 that forms a flow path inside, and an outer pipe 12 that forms a flow path in the gap between the inner pipe 11. The outer tube 12 has a nominal diameter that is two sizes larger than that of the inner tube 11, and both the inner tube 11 and the outer tube 12 are made of a resin tube, specifically, a polybutene tube. Hereinafter, the flow path inside the inner pipe 11 of the double pipe 10 is referred to as “inner pipe inner flow path”, and the flow path between the inner pipe 11 and the outer pipe 12 of the double pipe 10 is referred to as “inner pipe outer flow”. This is called “road”. In addition, the double pipe 10 constituted by the two pipes is referred to as a single pipe 16 that is constituted by a single pipe.

[First Embodiment]
Next, the double tube socket 20 of the first embodiment will be described with reference to FIGS. As shown in FIG. 1B, the double pipe socket 20 is a straight double pipe joint that connects two double pipes 10 in a straight line.

  Specifically, the double pipe socket 20 forms an outer shape of the double pipe socket 20, and an outer pipe joint 21 that connects the outer pipes 12 of the two double pipes 10, and an inner part of the outer pipe joint 21. And an inner pipe joint 22 for connecting the inner pipes 11 of the two double pipes 10 to each other.

  As shown in FIGS. 1B and 1C, in the present embodiment, as the outer pipe joint 21, an existing socket for a single pipe 16 that is a resin joint is used. Specifically, the outer pipe joint 21 is formed on one end side, is formed on the other end side with the first outer pipe connection port 31 that connects the outer pipe 12 of one double pipe 10, and the other double pipe. And a second outer pipe connection port 32 for connecting the outer pipe 12 of the pipe 10. The first outer pipe connection port 31 and the second outer pipe connection port 32 communicate with each other. Thus, the outer pipe joint 21 constitutes a connection flow path that connects the inner pipe / outer flow paths of the two double pipes 10 in the gap with the inner pipe joint 22.

  Each of the outer pipe connection ports 31 and 32 has an outer pipe connection allowance 36 into which the outer pipe 12 is inserted, and an end surface of the outer pipe 12 inserted into the outer pipe connection allowance 36 abuts to regulate the position of the outer pipe 12. And an outer tube abutting portion 37. In the outer tube connection allowance 36, a heat generating element 36a for electric welding is embedded. Therefore, when each outer tube 12 is connected to each outer tube connection port 31, 32, a controller is connected to the terminal (not shown) of the heating element 36a and energized, whereby the outer tube 12 is connected to the outer tube connection allowance 36. It is configured to be electrically welded to.

  As shown in FIGS. 1B and 1D, the inner pipe joint 22 is constituted by a metal straight joint. Specifically, the inner pipe joint 22 is formed on one end side, the first inner pipe connection port 41 (first inner pipe connection port) for connecting the inner pipe 11 of one of the double pipes 10, and the other end. And a second inner pipe connection port 42 (second inner pipe connection port) that is formed on the side and connects the inner pipe 11 of the other double pipe 10. The first inner pipe connection port 41 and the second inner pipe connection port 42 are integrally formed. Further, the first inner pipe connection port 41 and the second inner pipe connection port 42 communicate with each other. Thereby, the inner pipe joint 22 constitutes a connection flow path for connecting the inner pipe inner flow paths of the two double pipes 10 therein.

  In the first inner pipe connection port 41, an inner pipe connection allowance 46 (connection allowance) into which the inner pipe 11 is inserted outside and an end surface of the inner pipe 11 inserted into the inner pipe connection allowance 46 come into contact with each other. And an inner pipe abutting portion 47 for regulating the position.

  The inner pipe connection allowance 46 of the first inner pipe connection port 41 has an inner pipe joint portion 46a in which a plurality of peaks are formed in a bamboo shoot shape at the outer peripheral portion. By this inner pipe joint 46a, the inner pipe 11 can be inserted and connected to the first inner pipe connection port 41.

  Further, the inner tube abutting portion 47 of the first inner tube connection port 41 is disposed at the same position as the outer tube abutting portion 37 of the first outer tube connection port 31 in the axial direction. That is, the inner tube abutting portion 47 of the first inner tube connection port 41 is arranged so that the end surface of the abutted inner tube 11 is at the same position as the end surface of the outer tube 12 connected to the first outer tube connection port 31. The position of the inner tube 11 is regulated.

  Similarly to the first inner pipe connection port 41, the second inner pipe connection port 42 includes an inner pipe connection allowance 48 (connection allowance) into which the inner pipe 11 is inserted outside and an inner pipe inserted into the inner pipe connection allowance 48. 11 has an inner tube abutting portion 49 that abuts the end face and regulates the position of the inner tube 11.

  The inner pipe connection allowance 48 of the second inner pipe connection port 42 includes an inner pipe joint portion 48a in which a plurality of ridges are formed on the outer peripheral portion, and an inner pipe guide portion 48b extending in the axial direction from the inner pipe joint portion 48a. And have. By this inner pipe joint portion 48a, the inner pipe 11 can be inserted and connected to the second inner pipe connection port.

  The inner tube guide portion 48b has a tip that is tapered, and guides the inserted inner tube 11 to the inner tube joint portion 48a. And the inner pipe guide part 48b is an outer pipe joint in the state which connected the inner pipe 11 and the outer pipe 12 of said one double pipe 10 to the 1st inner pipe connection port 41 and the 1st outer pipe connection port 31, respectively. It is formed in a length protruding from the second outer pipe connection port 32 of the 21.

  That is, the inner pipe connection allowance 48 of the second inner pipe connection port 42 is the one in the state where the inner pipe 11 of the one double pipe 10 is inserted into the inner pipe connection allowance 46 of the first inner pipe connection port 41. It is formed so as to protrude from the outer pipe joint 21 connected to the outer pipe 12 of the double pipe 10. Thereby, in a state where the inner tube 11 and the outer tube 12 of one double tube 10 are connected, it is easy to connect the inner tube 11 of the other double tube 10.

  The inner tube abutting portion 49 of the second inner tube connection port 42 is disposed at a position inside the outer tube abutting portion 37 of the second outer tube connection port 32 in the axial direction. That is, the inner pipe abutting portion 49 of the second inner pipe connection port 42 is arranged such that the end surface of the abutted inner pipe 11 comes inside the end surface of the outer pipe 12 connected to the second outer pipe connection port 32. The position of the inner tube 11 is regulated. However, in the example of FIG. 1 (b), for the second inner pipe connection port 42 side, the double pipe 10 in which the end faces of the inner pipe 11 and the outer pipe 12 are flush with each other is connected, and this is integrated. Since the connection is assumed, the end surface of the inner pipe 11 reaches the inner pipe joint portion 48 a and does not reach the inner pipe abutting portion 49.

  Here, with reference to FIG. 2, the construction operation (construction method) of the double pipe socket 20 will be described. In this construction operation, two double pipes 10 are connected to the double pipe socket 20, and the two double pipes 10 are connected.

  As shown in FIG. 2A, first, the inner pipe 11 of one double pipe 10 is connected to the first inner pipe connection port 41 of the inner pipe joint 22. That is, the inner pipe 11 is inserted and connected to the first inner pipe connection port 41.

  When the inner pipe 11 of one double pipe 10 is connected to the first inner pipe connection port 41, as shown in FIG. 2 (b), the outer pipe 12 of the one double pipe 10 is now connected to the outer pipe. Connect to the first outer pipe connection port 31 of the joint 21. That is, the outer pipe 12 is connected to the first outer pipe connection port 31 while the inner pipe joint 22 is passed through the outer pipe joint 21. In order to perform the electric welding at the first outer tube connection port 31 and the second outer tube connection port 32 together, at this time, the electric connection may not be performed and a temporary connection may be used.

  When the outer pipe 12 of one double pipe 10 is connected to the first outer pipe connection port 31, finally, as shown in FIG. 2C, the inner pipe 11 of the other double pipe 10 is finally connected to the inner pipe joint 22. The outer pipe 12 of the double pipe 10 is connected to the second outer pipe connection port 32 of the outer pipe joint 21. Specifically, first, the inner pipe 11 is inserted into the inner pipe connection allowance 48 (inner pipe guide portion 48b) protruding from the outer pipe joint 21, and in this state, the inner pipe 11 and the outer pipe 12 are pushed together. As a result, the outer tube 12 is inserted to the outer tube abutting portion 37, and the inner tube 11 is inserted to the inner tube joint 48a. Thereafter, the outer tube 12 is electrically welded to connect the inner tube 11 and the outer tube 12 to the second inner tube connection port 42 and the second outer tube connection port 32. This completes the construction operation.

[Second Embodiment]
Next, with reference to FIG. 3, the double pipe elbow 50 of 2nd Embodiment is demonstrated. As shown in FIG. 3A, the double pipe elbow 50 is an “L” -shaped double pipe joint that vertically connects two double pipes 10.

  Specifically, the double pipe elbow 50 forms the outer shape of the double pipe elbow 50, and includes an outer pipe joint 51 that connects the outer pipes 12 of the two double pipes 10, and an inner part of the outer pipe joint 51. And an inner pipe joint 52 for connecting the inner pipes 11 of the two double pipes 10 to each other.

  As shown in FIGS. 3A and 3B, in the present embodiment, as the outer pipe joint 51, an existing elbow for the single pipe 16 that is a resin joint is used. Specifically, the outer pipe joint 51 is formed on one end side, is formed on the other end side with a first outer pipe connection port 61 that connects the outer pipe 12 of one double pipe 10, and the other double pipe. And a second outer pipe connection port 62 for connecting the outer pipe 12 of the pipe 10. The first outer pipe connection port 61 and the second outer pipe connection port 62 communicate with each other. Thus, the outer pipe joint 51 constitutes a connection flow path that connects the inner pipe outer flow paths of the two double pipes 10 to the gap with the inner pipe joint 52.

  Each of the outer pipe connection ports 61 and 62 has an outer pipe connection allowance 66 into which the outer pipe 12 is inserted, and an end surface of the outer pipe 12 inserted into the outer pipe connection allowance 66 abuts to regulate the position of the outer pipe 12. And an outer tube abutting portion 67. In the outer tube connection allowance 66, a heating element 66a for electric welding is embedded. Therefore, when connecting each outer tube 12 to each outer tube connection port 61, 62, a controller is connected to a terminal (not shown) of the heating element 66a and energized, whereby the outer tube 12 is connected to the outer tube connection allowance 66. It is configured to be electrically welded to.

  As shown in FIGS. 3A and 3C, the inner pipe joint 52 is formed of a metal “L” -shaped joint. Specifically, the inner pipe joint 52 is formed on one end side, the first inner pipe connection port 71 (first inner pipe connection port) that connects the inner pipe 11 of one of the double pipes 10, and the other end. And a second inner pipe connection port 72 (second inner pipe connection port) that is formed on the side and connects the inner pipe 11 of the other double pipe 10. The first inner pipe connection port 71 and the second inner pipe connection port 72 are configured as separate bodies and are configured to be joinable in the outer pipe joint 51. The first inner pipe connection port 71 and the second inner pipe connection port 72 communicate with each other. Thereby, the inner pipe joint 52 constitutes a connection flow path for connecting the inner pipe inner flow paths of the two double pipes 10 therein.

  The first inner pipe connection port 71 has an inner pipe connection allowance 76 (connection allowance) into which the inner pipe 11 is inserted to the outside, and an end surface of the inner pipe 11 inserted into the inner pipe connection allowance 76 abuts. And an inner pipe abutting portion 77 for regulating the position.

  The inner pipe connection allowance 76 of the first inner pipe connection port 71 has an inner pipe joint portion 76a in which a plurality of peaks are formed in a bamboo shoot shape at the outer peripheral portion. By this inner pipe joining portion 76a, the inner pipe 11 can be inserted and connected to the first inner pipe connection port 71.

  Further, the inner tube abutting portion 77 of the first inner tube connection port 71 is disposed at the same position as the outer tube abutting portion 67 of the first outer tube connection port 61 in the axial direction. That is, the inner pipe abutting portion 77 of the first inner pipe connection port 71 is arranged so that the end surface of the abutted inner pipe 11 is at the same position as the end surface of the outer pipe 12 connected to the first outer pipe connection port 61. The position of the inner tube 11 is regulated.

  Similarly to the first inner pipe connection port 71, the second inner pipe connection port 72 includes an inner pipe connection allowance 78 (connection allowance) into which the inner pipe 11 is inserted outside and an inner pipe inserted into the inner pipe connection allowance 78. 11 has an inner tube abutting portion 79 that abuts on the end face and regulates the position of the inner tube 11.

  The inner pipe connection allowance 78 of the second inner pipe connection port 72 includes an inner pipe joint portion 78a in which a plurality of ridges are formed on the outer peripheral portion, and an inner pipe guide portion 78b extending in the axial direction from the inner pipe joint portion 78a. And have. By this inner pipe joint portion 78a, the inner pipe 11 can be inserted and connected to the second inner pipe connection port 72.

  The inner tube guide portion 78b has a tip portion that is tapered, and guides the inserted inner tube 11 to the inner tube joint portion 78a. And the inner pipe guide part 78b is an outer pipe joint in the state which connected the inner pipe 11 and the outer pipe 12 of said one double pipe 10 to the 1st inner pipe connection port 71 and the 1st outer pipe connection port 61, respectively. The first outer pipe connection port 62 has a length protruding from the second outer pipe connection port 62.

  That is, the inner pipe connection allowance 78 of the second inner pipe connection port 72 is formed by inserting the inner pipe 11 of the one double pipe 10 into the inner pipe connection allowance 76 of the first inner pipe connection port 71 and connecting the second inner pipe. In a state where the port 72 is joined to the first inner tube connection port 71, it is formed so as to protrude from the outer tube joint 51 connected to the outer tube 12 of the one double tube 10. Thereby, in a state where the inner tube 11 and the outer tube 12 of one double tube 10 are connected, it is easy to connect the inner tube 11 of the other double tube 10.

  The inner tube abutting portion 79 of the second inner tube connection port 72 is disposed at a position inside the outer tube abutting portion 67 of the second outer tube connection port 62 in the axial direction. That is, the inner pipe abutting portion 79 of the second inner pipe connection port 72 is such that the end surface of the abutted inner pipe 11 comes inside the end surface of the outer pipe 12 connected to the second outer pipe connection port 62. The position of the inner tube 11 is regulated.

  Here, with reference to FIG. 4, the construction operation (construction method) of the double pipe elbow 50 will be described. In this construction operation, the two double pipes 10 are connected to the double pipe elbow 50 and the two double pipes 10 are connected. In addition, this construction operation is performed from the state where the second inner pipe connection port 72 is removed from the first inner pipe connection port 71.

  As shown in FIG. 4A, first, the inner pipe 11 of one double pipe 10 is connected to the first inner pipe connection port 71 of the inner pipe joint 52. That is, the inner pipe 11 is inserted and connected to the first inner pipe connection port 71.

  When the inner pipe 11 of one double pipe 10 is connected to the first inner pipe connection port 71, as shown in FIG. 4B, the outer pipe 12 of the one double pipe 10 is now connected to the outer pipe. Connect to the first outer pipe connection port 61 of the joint 51. That is, the outer tube 12 is connected to the first outer tube connection port 61 while the inner tube joint 52 (first inner tube connection port 71) is passed through the outer tube joint 51. In order to perform the electric welding at the first outer pipe connection port 61 and the second outer pipe connection port 62 together, at this time, the electric connection may not be performed and a temporary connection may be used.

  When the outer tube 12 of one of the double tubes 10 is connected to the first outer tube connection port 61, the second inner tube connection port 72 is connected to the first inner tube in the outer tube joint 51 as shown in FIG. It joins to the pipe connection port 71.

  When the second inner pipe connection port 72 is joined to the first inner pipe connection port 71, the inner pipe 11 of the other double pipe 10 is finally connected to the second of the inner pipe joint 52 as shown in FIG. The outer pipe 12 of the double pipe 10 is connected to the second outer pipe connection port 62 of the outer pipe joint 51 to the inner pipe connection port 72. Specifically, first, the inner tube 11 is inserted into the inner tube connection allowance 78 (inner tube guide portion 78b) protruding from the outer tube joint 51, and in this state, the inner tube 11 and the outer tube 12 are pushed together. As a result, the outer tube 12 is inserted into the outer tube abutting portion 67 and the inner tube 11 is inserted into the inner tube abutting portion 79. Thereafter, the outer tube 12 is electrically welded to connect the inner tube 11 and the outer tube 12 to the second inner tube connection port 72 and the second outer tube connection port 62. This completes the construction operation.

[Third Embodiment]
Next, with reference to FIG. 5, the double tube cheese 80 of 3rd Embodiment is demonstrated. As shown in FIG. 5 (a), in the double tube cheese 80, two double tubes 10 are linearly formed with respect to three double tubes 10, and the other single double tube 10 is connected to the two double tubes 10. This is a “T” -shaped double pipe joint that is vertically connected to the double pipe 10 of the book. Hereinafter, the two double tubes 10 will be referred to as a first double tube 10 and a second double tube 10, respectively, and one double tube 10 connected vertically to the two double tubes 10. The double tube 10 will be referred to as a third double tube 10.

  Specifically, the double-pipe cheese 80 forms the outer shape of the double-pipe cheese 80, and an outer pipe joint 81 that connects the outer pipes 12 of the three double pipes 10, and the inner part of the outer pipe joint 81. And an inner pipe joint 82 for connecting the inner pipes 11 of the three double pipes 10 to each other.

  As shown in FIGS. 5A and 5B, in the present embodiment, as the outer pipe joint 81, an existing cheese for the single pipe 16 that is a resin joint is used. Specifically, the outer pipe joint 81 is formed on the former side, is formed on the front side with the first outer pipe connection port 91 that connects the outer pipe 12 of the first double pipe 10, and the second two A second outer tube connection port 92 for connecting the outer tube 12 of the heavy tube 10, and a third outer tube connection port 93 formed on the branch side for connecting the outer tube 12 of the third double tube 10. ing. The first outer tube connection port 91, the second outer tube connection port 92, and the third outer tube connection port 93 communicate with each other. As a result, the outer pipe joint 81 forms a connection flow path that connects the inner pipe / outer flow paths of the three double pipes 10 to the gap with the inner pipe joint 82.

  Each outer pipe connection port 91, 92, 93 is abutted by an outer pipe connection allowance 96 into which the outer pipe 12 is inserted, and an end surface of the outer pipe 12 inserted into the outer pipe connection allowance 96, and the position of the outer pipe 12. And an outer tube abutting portion 97 for regulating In the outer tube connection allowance 96, a heating element 96a for electric welding is embedded. Therefore, when each outer tube 12 is connected to each outer tube connection port 91, 92, 93, a controller is connected to the terminal (not shown) of the heating element 96a and energized to connect the outer tube 12 to the outer tube. It is configured to be electrically welded to the generation 96.

  As shown in FIGS. 5A and 5C, the inner pipe joint 82 is made of a metal “T” -shaped joint. Specifically, the inner pipe joint 82 is formed on the original side, the first inner pipe connection port 101 (first inner pipe connection port) for connecting the inner pipe 11 of the first double pipe 10, and the tip A second inner pipe connection port 102 (second inner pipe connection port) that is formed on the side and connects the inner pipe 11 of the second double pipe 10, and a third double pipe 10 that is formed on the branch side. And a third inner pipe connection port 103 (third inner pipe connection port) for connecting the inner pipe 11.

  The first inner pipe connection port 101 and the second inner pipe connection port 102 are integrally formed. On the other hand, the third inner pipe connection port 103 is configured separately from the first inner pipe connection port 101 and the second inner pipe connection port 102. The third inner pipe connection port 103 is configured to be able to be joined in the outer pipe joint 81 to an integrated body of the first inner pipe connection port 101 and the second inner pipe connection port 102. The first inner pipe connection port 101, the second inner pipe connection port 102, and the third inner pipe connection port 103 communicate with each other. Thereby, the inner pipe joint 82 constitutes a connection flow path for connecting the inner pipe flow paths of the three double pipes 10 inside thereof.

  The first inner pipe connection port 101 has an inner pipe connection allowance 106 (connection allowance) into which the inner pipe 11 is inserted to the outside, and an end surface of the inner pipe 11 inserted into the inner pipe connection allowance 106 abuts. And an inner pipe abutting portion 107 for regulating the position.

  The inner pipe connection allowance 106 of the first inner pipe connection port 101 has an inner pipe joint portion 106a in which a plurality of peaks are formed in a bamboo shoot shape on the outer peripheral portion. By this inner pipe joint portion 106a, the inner pipe 11 can be inserted and connected to the first inner pipe connection port 101.

  Further, the inner tube abutting portion 107 of the first inner tube connection port 101 is disposed at the same position as the outer tube abutting portion 97 of the first outer tube connection port 91 in the axial direction. That is, the inner tube abutting portion 107 of the first inner tube connection port 101 is arranged such that the end surface of the abutted inner tube 11 is at the same position as the end surface of the outer tube 12 connected to the first outer tube connection port 91. The position of the inner tube 11 is regulated.

  Similarly to the first inner pipe connection port 101, the second inner pipe connection port 102 and the third inner pipe connection port 103 are connected to an inner pipe connection allowance 108 (connection allowance) in which the inner pipe 11 is inserted to the outside, and an inner pipe connection. An end face of the inner pipe 11 inserted into the allowance 108 comes into contact with the inner pipe abutting portion 109 that regulates the position of the inner pipe 11.

  The inner pipe connection allowance 108 of the second inner pipe connection port 102 and the third inner pipe connection port 103 includes an inner pipe joint portion 108a in which a plurality of ridges are formed on the outer peripheral portion, and a shaft extending from the inner pipe joint portion 108a. And an inner tube guide portion 108b extending in the direction. By this inner pipe joint portion 108a, each inner pipe 11 can be inserted and connected to each inner pipe connection port 102, 103.

  The inner tube guide portion 108b has a tapered tip, and guides the inserted inner tube 11 to the inner tube joint portion 108a. And the inner pipe guide part 108b is an outer pipe joint in the state which connected the inner pipe 11 and the outer pipe 12 of the 1st double pipe 10 to the 1st inner pipe connection port 101 and the 1st outer pipe connection port 91, respectively. The first outer pipe connection port 92 or the third outer pipe connection port 93 has a length protruding from the second outer pipe connection port 92.

  That is, the inner pipe connection allowance 108 of the second inner pipe connection port 102 is the first in the state where the inner pipe 11 of the first double pipe 10 is inserted into the inner pipe connection allowance 106 of the first inner pipe connection port 101. It is formed so as to protrude from the outer pipe joint 81 connected to the outer pipe 12 of the double pipe 10. Thereby, in a state where the inner tube 11 and the outer tube 12 of the first double tube 10 are connected, the inner tube 11 of the second double tube 10 is easily connected.

  The inner pipe connection allowance 108 of the third inner pipe connection port 103 is formed by inserting the inner pipe 11 of the first double pipe 10 into the inner pipe connection allowance 106 of the first inner pipe connection port 101 and connecting the third inner pipe. In a state where the port 103 is joined to the integrated body of the first inner tube connection port 101 and the second inner tube connection port 102, the port 103 projects from the outer tube joint 81 connected to the outer tube 12 of the first double tube 10. So that it is formed. Thereby, in the state where the inner tube 11 and the outer tube 12 of the first double tube 10 are connected, the inner tube 11 of the third double tube 10 is easily connected.

  The inner tube abutting portions 109 of the second inner tube connection port 102 and the third inner tube connection port 103 are, in the axial direction, outer tube abutting portions 97 of the second outer tube connection port 92 and the third outer tube connection port 93. It is arranged at a more inner position. That is, the inner pipe abutting portion 109 of the second inner pipe connection port 102 is arranged such that the end surface of the abutted inner pipe 11 comes inside the end surface of the outer pipe 12 connected to the second outer pipe connection port 92. The position of the inner tube 11 is regulated. Further, the inner pipe abutting portion 109 of the third inner pipe connection port 103 is arranged so that the end surface of the abutted inner pipe 11 comes inside the end surface of the outer pipe 12 connected to the third outer pipe connection port 93. The position of the inner tube 11 is regulated.

  Here, with reference to FIG. 6, the construction operation (construction method) of the double-pipe cheese 80 will be described. In this construction operation, the three double tubes 10 are connected to the double tube cheese 80 and the three double tubes 10 are connected. In addition, this construction operation is performed from the state where the third inner pipe connection port 103 is removed from the integrated body of the first inner pipe connection port 101 and the second inner pipe connection port 102.

  As shown in FIG. 6A, first, the inner tube 11 of the first double tube 10 is connected to the first inner tube connection port 101 of the inner tube joint 82. That is, the inner pipe 11 is inserted and connected to the first inner pipe connection port 101.

  When the inner pipe 11 of the first double pipe 10 is connected to the first inner pipe connection port 101, as shown in FIG. 6B, the outer pipe 12 of the first double pipe 10 is now connected to the outer side. Connect to the first outer pipe connection port 91 of the pipe joint 81. That is, the outer pipe 12 is passed through the first outer pipe connection port 91 while the inner pipe joint 82 (the integrated body of the first inner pipe connection port 101 and the second inner pipe connection port 102) is passed through the inside of the outer pipe joint 81. Connect to. Note that at this point in time, the electric welding is not performed so that the electric welding at the first outer pipe connection port 91 and the electric welding at the second outer pipe connection port 92 or the third outer pipe connection port 93 are performed together. Alternatively, a temporary connection may be used.

  When the outer pipe 12 of the first double pipe 10 is connected to the first outer pipe connection port 91, the third inner pipe connection port 103 is connected to the first inner pipe connection port 103 in the outer pipe joint 81 as shown in FIG. The first inner pipe connection port 101 and the second inner pipe connection port 102 are joined together.

  When the third inner pipe connection port 103 is joined to the integrated body of the first inner pipe connection port 101 and the second inner pipe connection port 102, as shown in FIG. The inner tube 11 is connected to the second inner tube connection port 102 of the inner tube joint 82, and the outer tube 12 of the double tube 10 is connected to the second outer tube connection port 92 of the outer tube joint 81. Specifically, first, the inner pipe 11 is inserted into the inner pipe connection allowance 108 (inner pipe guide portion 108b) protruding from the outer pipe joint 81, and in this state, the inner pipe 11 and the outer pipe 12 are pushed together. As a result, the outer tube 12 is inserted to the outer tube abutting portion 97, and the inner tube 11 is inserted to the inner tube abutting portion 109. Thereafter, the outer tube 12 is electrically welded to connect the inner tube 11 and the outer tube 12 to the second inner tube connection port 102 and the second outer tube connection port 92.

  After that, as shown in FIG. 7E, the inner tube 11 of the third double tube 10 is connected to the third inner tube connection port 103 of the inner tube joint 82, and the outer tube 12 of the double tube 10 is connected to the outer tube. Connect to the third outer pipe connection port 93 of the joint 81. Specifically, as in the case of the second double pipe 10, first, the inner pipe 11 is inserted into the inner pipe connection allowance 108 (inner pipe guide portion 108b) protruding from the outer pipe joint 81, and in this state By pushing the inner tube 11 and the outer tube 12 together, the outer tube 12 is inserted into the outer tube abutting portion 97 and the inner tube 11 is inserted into the inner tube abutting portion 109. Thereafter, the outer tube 12 is electrically welded to connect the inner tube 11 and the outer tube 12 to the third inner tube connection port 103 and the third outer tube connection port 93. This completes the construction operation.

[Fourth Embodiment]
Next, with reference to FIG. 8, the double pipe branch joint 110 of 4th Embodiment is demonstrated. As shown in FIG. 8A, in the double pipe branch joint 110, the double pipe 10 and the two single pipes 16 are connected, and the inner pipe 11 of the double pipe 10 is connected to one single pipe 16. This is a double pipe joint that connects the outer pipe 12 of the double pipe 10 to the other single pipe 16.

  Specifically, the double pipe branch joint 110 forms the outer shape of the double pipe branch joint 110, and includes an outer pipe joint 111 in which the outer pipe 12 of the double pipe 10 and the two single pipes 16 are connected. The inner pipe joint 112 is disposed inside the outer pipe joint 111 and connected to the inner pipe 11 of the double pipe 10.

  As shown in FIGS. 8A and 8B, in the present embodiment, as the outer pipe joint 111, an existing cheese for a single pipe 16 that is a resin joint is used. Specifically, the outer pipe joint 111 is formed on the original side, the first single pipe connection port 121 that connects one single pipe 16, and the second single pipe 16 that is formed on the branch side and connects the other single pipe 16. A single pipe connection port 122 and an outer pipe connection port 123 formed on the front side and connecting the outer pipe 12 of the double pipe 10 are provided. The second single pipe connection port 122 and the outer pipe connection port 123 communicate with each other. Thus, the outer pipe joint 111 constitutes a connection flow path that connects the other single pipe 16 and the inner pipe / outer flow path of the double pipe 10 in the gap with the inner pipe joint 112.

  Each single pipe connection port 121, 122 has a single pipe connection allowance 126 into which the single pipe 16 is inserted, and an end face of the single pipe 16 inserted into the single pipe connection allowance 126 abuts to regulate the position of the single pipe 16. A single tube abutting portion 127 for A heating element 126 a for electric welding is embedded in the single pipe connection allowance 126. Therefore, when each single pipe 16 is connected to each single pipe connection port 121, 122, a controller is connected to a terminal (not shown) of the heating element 126a and energized, whereby the single pipe 16 is connected to the single pipe connection allowance 126. It is configured to be electrically welded to.

  The outer pipe connection port 123 restricts the position of the outer pipe 12 by the outer pipe connection allowance 128 into which the outer pipe 12 is inserted and the end surface of the outer pipe 12 inserted into the outer pipe connection allowance 128 abut. And an outer tube abutting portion 129. In the outer pipe connection allowance 128, a heating element 128a for electric welding is embedded. Therefore, when connecting the outer tube 12 to the outer tube connection port 123, a controller is connected to the terminal (not shown) of the heating element 128a and energized to electrically weld the outer tube 12 to the outer tube connection allowance 128. It has a configuration.

  As shown in FIGS. 8A and 8C, the inner pipe joint 112 is formed of a funnel-shaped metal joint. Specifically, the inner pipe joint 112 is connected to the inner pipe connection port 131 that connects the inner pipe 11 and the inner pipe connection port 131, and the inner pipe connection port 131 is connected to one of the single units connected to the outer pipe joint 111. And a conical cylindrical communication member 132 communicating with the pipe 16. That is, the inner pipe joint 112 constitutes a connection flow path connecting the inner pipe inner flow path of the double pipe 10 and one single pipe 16 therein.

  The inner pipe connection port 131 has an inner pipe connection allowance 136 (connection allowance) into which the inner pipe 11 is inserted to the outside thereof, and an end surface of the inner pipe 11 inserted into the inner pipe connection allowance 136 abuts to determine the position of the inner pipe 11. An inner pipe abutting portion 137 to be regulated.

  The inner pipe connection allowance 136 has an inner pipe joint portion 136a in which a plurality of ridges are formed on the outer peripheral portion, and an inner pipe guide portion 136b extending in the axial direction from the inner pipe joint portion 136a. By this inner pipe joint 136a, the inner pipe 11 can be inserted and connected to the inner pipe connection port 131.

  The inner tube guide portion 136b has a tip portion that is tapered, and guides the inserted inner tube 11 to the inner tube joint portion 136a. The inner pipe guide portion 136b is formed to have a length protruding from the outer pipe connection port 123 of the outer pipe joint 111 in a state where one single pipe 16 is connected to the first single pipe connection port 121. That is, the inner pipe connection allowance 136 of the inner pipe connection port 131 is formed so as to protrude from the outer pipe joint 111 that connects the first single pipe connection port 121 to the single pipe 16. This facilitates connection of the inner tube 11 of the double tube 10 in a state where one single tube 16 is connected.

  The inner tube abutting portion 137 is disposed at a position inside the outer tube abutting portion 129 of the outer tube connection port 123 in the axial direction. That is, the inner tube abutting portion 137 of the inner tube connection port 131 is configured so that the end surface of the abutted inner tube 11 comes inside the end surface of the outer tube 12 connected to the outer tube connection port 123. Regulate the position.

  The communication member 132 is seated on the single tube abutting portion 127 of the first single tube connection port 121 and has a flange portion 132a that is sandwiched between the single tube abutting portion 127 and the end surface of one single tube 16. ing. When attaching the inner pipe joint 112 to the outer pipe joint 111, the flange portion 132 a of the communication member 132 is seated on the single pipe abutting portion 127 of the first single pipe connection port 121, and in this state, one single pipe 16 is attached. Connect to the first single pipe connection port 121. As a result, the flange portion 132 a is sandwiched between the single tube abutting portion 127 and the end surface of the one single tube 16, and the inner tube joint 112 is held by the outer tube joint 111 and the one single tube 16. For this reason, in the construction operation (construction method) of the double pipe branch joint 110, first, the flange portion 132a of the inner pipe joint 112 is seated on the single pipe abutting portion 127, and one single pipe 16 is attached to the first pipe 16 as the first. 1 is connected to the single tube connection port 121, and then the other single tube 16 is connected to the second single tube connection port 122, and the inner tube 11 and the outer tube 12 of the double tube 10 are connected to the inner tube connection port 131 and Each is connected to the outer pipe connection port 123.

[Fifth Embodiment]
Next, with reference to FIG. 9, the double pipe adapter coupling 140 of 5th Embodiment is demonstrated. As shown to Fig.9 (a), the double pipe adapter coupling 140 is connected to the double pipe 10 and the equipment connection pipe A1 (connection pipe) of the water supply or hot water supply terminal A. It is a double pipe joint that connects the flow path in the inner pipe to the instrument connecting pipe A1.

  Specifically, the double pipe adapter joint 140 forms the outer shape of the double pipe adapter joint 140, and includes an outer pipe joint 141 in which the outer pipe 12 and the instrument connecting pipe A1 are connected, and the outer pipe joint 141. And an inner pipe joint 142 to which the inner pipe 11 is connected.

  As shown in FIGS. 9A and 9B, in this embodiment, an existing adapter joint for the single pipe 16 that is a resin joint is used as the outer pipe joint 141. Specifically, the outer pipe joint 141 is formed on one end side and is connected to the terminal connection port 151 for connecting the instrument connecting pipe A1 and the other end side and connected to the outer pipe 12 of the double pipe 10. A pipe connection port 152.

  The terminal connection port 151 has a connecting pipe abutting portion where a connecting pipe connecting allowance 156 to which the instrument connecting pipe A1 is attached and an end face of the instrument connecting pipe A1 attached to the connecting pipe connecting allowance 156 abut against each other. 157 (abutting portion).

  The outer tube connection port 152 restricts the position of the outer tube 12 by the outer tube connection allowance 158 into which the outer tube 12 is inserted and the end surface of the outer tube 12 inserted into the outer tube connection allowance 158 come into contact with each other. An outer tube abutting portion 159. A heating element 158 a for electric welding is embedded in the outer tube connection allowance 158. Therefore, when connecting the outer tube 12 to the outer tube connection port 152, a controller is connected to the terminal (not shown) of the heating element 158a and energized to electrically weld the outer tube 12 to the outer tube connection allowance 158. It has a configuration.

  As shown in FIGS. 9A and 9C, the inner pipe joint 142 is composed of a metal joint. Specifically, the inner pipe joint 142 is connected to the inner pipe connection port 161 for connecting the inner pipe 11 and the inner pipe connection port 161, and the inner pipe connection port 161 is connected to an instrument connected to the outer pipe joint 141. And a communication member 162 communicating with the pipe A1. That is, the inner pipe joint 142 constitutes a connection flow path for connecting the inner pipe inner flow path of the double pipe 10 and the instrument connecting pipe A1 therein.

  The inner pipe connection port 161 has an inner pipe connection allowance 166 (connection allowance) into which the inner pipe 11 is inserted to the outside thereof, and an end surface of the inner pipe 11 inserted into the inner pipe connection allowance 166 abuts to determine the position of the inner pipe 11. An inner pipe abutting portion 167 to be regulated and a communication opening 168 that communicates the inside and outside of the inner pipe connection port 161 are provided. The inner pipe joint 142 connects the inner pipe inner flow path and the inner pipe outer flow path of the double pipe 10 through the communication opening 168.

  The inner pipe connection allowance 166 includes an inner pipe joint portion 166a in which a plurality of peaks are formed on the outer periphery of the bamboo tube, and an inner pipe guide portion 166b extending in the axial direction from the inner pipe joint portion 166a. By this inner pipe joint portion 166a, the inner pipe 11 can be inserted and connected to the inner pipe connection port 161.

  The inner tube guide portion 166b has a tip that is tapered, and guides the inserted inner tube 11 to the inner tube joint 166a. And the inner pipe guide part 166b is formed in the length which protrudes from the outer pipe connection port 152 of the outer pipe joint 141 in the state which connected the instrument connecting pipe A1 to the terminal connection port 151. As shown in FIG. That is, the inner pipe connection allowance 166 of the inner pipe connection port 161 is formed so as to protrude from the outer pipe joint 141 in which the terminal connection port 151 is connected to the instrument connecting pipe A1. This makes it easy to connect the inner tube 11 of the double tube 10 in a state where the instrument connection tube A1 is connected.

  The inner tube abutting portion 167 is disposed at a position inside the outer tube abutting portion 159 of the outer tube connection port 152 in the axial direction. That is, the inner tube abutting portion 167 of the inner tube connection port 161 is configured so that the end surface of the abutted inner tube 11 comes inside the end surface of the outer tube 12 connected to the outer tube connection port 152. Regulate the position.

  The communication member 162 is seated on the connecting pipe abutting part 157 of the terminal connection port 151, and has a flange part 162a that is sandwiched between the connecting pipe abutting part 157 and the end face of the instrument connecting pipe A1. Yes. When the inner pipe joint 142 is attached to the outer pipe joint 141, the flange 162a of the communication member 162 is seated on the connecting pipe abutting part 157 of the terminal connection port 151, and in this state, the instrument connecting pipe A1 is connected to the terminal. Connect to port 151. Thus, the flange portion 162a is sandwiched between the connecting tube abutting portion 157 and the end surface of the instrument connecting tube A1, and the inner tube joint 142 is held by the outer tube joint 141 and the instrument connecting tube A1. . In this regard, in the construction operation (construction method) of the double pipe adapter joint 140, first, the flange 162a of the inner pipe joint 142 is seated on the connecting pipe abutting section 157, and the instrument connecting pipe A1 is attached. After connecting to the terminal connection port 151, the inner tube 11 and the outer tube 12 of the double tube 10 are then connected to the inner tube connection port 161 and the outer tube connection port 152, respectively.

  Next, referring to FIG. 10, a hot water supply piping system SY (using the double pipe socket 20, double pipe elbow 50, double pipe cheese 80, double pipe branch joint 110, and double pipe adapter joint 140 described above) Piping system) will be described. This hot water supply piping system SY supplies hot water to a plurality of hot water supply terminals A by a pre-branch method. In particular, the hot water supply piping system SY is a reverse / return hot water supply system, and hot water in the hot water supply forward flow path and the hot water supply return flow path is provided by a circulation pump unit 202 to which the hot water supply forward flow path and the hot water supply return flow path are connected. Is circulated so that the temperature can be raised, so that the hot water in the hot water supply flow path and the hot water return flow path is maintained at a constant temperature (immediate hot water function).

  As shown in FIG. 10, a hot water supply piping system SY includes a water heater 201 having a heat pump as an auxiliary heat source and an electric or gas hot water source as a main heat source, a circulation pump unit 202 attached to the water heater 201, and a water heater 201. A connection pipe 203 that connects the circulation pump unit 202 and a hot water supply pipe 204 that connects the circulation pump unit 202 and the plurality of hot water supply terminals A are provided. The plurality of hot water supply terminals A are installed in a standard house, and are composed of a mixer tap for a bathroom vanity, a mixer tap for a bathroom, a mixer tap for a system kitchen, and the like. These mixing plugs (hot-water supply terminal A) are provided with a pair of hot water connecting pipes A1 at the lower concealment portion.

  The hot water supply pipe 204 includes a hot water supply main pipe 211 having one end connected to the discharge port side of the circulation pump unit 202, a hot water return main pipe 212 having one end connected to the suction port side of the circulation pump unit 202, a hot water supply main pipe 211, and The double pipe branch joint 110 to which the other end of the hot water return main pipe 212 is connected, the hot water main pipe 213 to which one end is connected to the double pipe branch joint 110 and the other end is connected to one hot water supply terminal A, The double pipe socket 20 provided in the main pipe 213, the plurality of double pipe cheeses 80 provided in the hot water supply main pipe 213, one end is connected to each double pipe cheese 80, and the other end is 1 each. And a plurality of hot water supply branch pipes 214 connected to the hot water supply terminal A. Further, the double pipe elbow 50 is interposed in the bent portions of the hot water supply main pipe 213 and the hot water supply branch pipe 214. Further, the double pipe adapter joint 140 is interposed in a connection portion between the hot water supply main pipe 213 and the hot water supply terminal A and a connection portion between the hot water supply branch pipe 214 and the hot water supply terminal A, respectively.

  In the hot water supply pipe 204, the hot water supply main pipe 213 and the hot water supply branch pipe 214 are constituted by the double pipe 10, and the hot water supply main pipe 211, the double pipe branch joint 110, the flow path in the inner pipe of the hot water supply main pipe 213, the double pipe The pipe socket 20, the plurality of double pipe cheeses 80, the inner pipe flow path of the hot water supply branch pipe 214, and the plurality of double pipe elbows 50, provide a hot water supply forward flow path from the circulation pump unit 202 to each double pipe adapter joint 140. It is composed. Also, the hot water return main pipe 212, the double pipe branch joint 110, the inner and outer flow paths of the hot water main pipe 213, the double pipe socket 20, the plurality of double pipe cheeses 80, the inner and outer flow paths of the hot water branch pipe 214, and the plurality of two pipes. The heavy pipe elbow 50 constitutes a hot water supply return flow path from each double pipe adapter joint 140 to the circulation pump unit 202.

  The hot water supply main pipe 213 and the hot water supply branch pipe 214 are constituted by the double pipe 10 as described above. Specifically, the hot water supply main pipe 213 is configured by a plurality of the double pipes 10 connected by the double pipe socket 20, the plurality of double pipe elbows 50, and the plurality of double pipe cheeses 80. The hot water supply branch pipe 214 is constituted by a plurality of the above-mentioned double pipes 10 connected by one or more (one or more) double pipe elbows 50 and a plurality of double pipe cheeses 80. In these double pipes 10, the inner pipe inner flow path constitutes a hot water supply forward flow path, and the inner pipe outer flow path constitutes a hot water supply return flow path.

  The double pipe branch joint 110, the double pipe socket 20, the double pipe cheese 80, the double pipe elbow 50, and the double pipe adapter joint 140 are the same as those described above.

  The double pipe branch joint 110 is connected to a hot water supply main pipe 211 and a hot water return main pipe 212, which are single pipes 16, and a hot water supply main pipe 213, and connects the hot water supply main pipe 211 to the internal pipe flow path of the hot water supply main pipe 213. The return pipe 212 is connected to the inner pipe / outer flow path of the hot water supply main pipe 213.

  The double pipe socket 20 connects two double pipes 10 constituting the hot water supply main pipe 213, and connects the internal pipe internal flow paths and the internal pipe external flow paths of the two double pipes 10, respectively.

  The double-pipe cheese 80 connects two double pipes 10 of the hot water supply main pipe 213 and one double pipe 10 of the hot water supply branch pipe 214, and the flow paths in the inner pipes of these three double pipes 10 are connected to each other. The inner and outer flow paths are connected to each other.

  The double pipe elbow 50 connects the two double pipes 10 of the hot water supply main pipe 213 or the hot water supply branch pipe 214 and connects the internal pipe internal flow paths and the internal pipe external flow paths of the two double pipes 10, respectively. To do.

  The double pipe adapter joint 140 is connected to the hot water supply main pipe 213 or the hot water supply branch pipe 214 and the appliance connection pipe A1 of the hot water supply terminal A, and connects the flow path in the inner pipe of the hot water supply main pipe 213 or the hot water supply branch pipe 214 to the appliance. Connect to tube A1. Moreover, the double pipe adapter joint 140 connects the inner pipe inner flow path (hot water supply forward flow path) and the inner pipe inner flow path (hot water supply return flow path) of the hot water supply main pipe 213 or the hot water supply branch pipe 214. Thereby, in the whole hot water supply piping 204, the downstream side of the hot water supply forward flow path and the upstream side of the hot water supply return flow path are connected. As a result, a circulation flow path is formed through the circulation pump unit 202, which includes a hot water supply forward flow path and a hot water supply return flow path.

  The circulation pump unit 202 has a circulation pump and a heating tank with a built-in heater (all are not shown). The circulation pump unit 202 drives the circulation pump and the heater to circulate the hot water in the circulation flow path (the hot water supply forward flow path and the hot water supply return flow path) while raising the temperature, thereby setting the temperature of the hot water in the circulation flow path. Maintain a constant temperature.

  In the hot water supply piping system SY, when a user opens one of the hot water supply terminals A so as to use hot water, the hot water of the hot water heater 201 is supplied to the circulation pump unit 202 via the connection pipe 203 by the water head pressure. From the circulation pump unit 202, a hot water supply flow path (a hot water supply main pipe 211, a double pipe branch joint 110, a hot water supply main pipe 213, a double pipe socket 20, a plurality of double pipe cheeses 80, a hot water supply branch pipe 214, a plurality of double pipes The hot water supply terminal A is supplied through a pipe elbow 50). In the hot water supply piping system SY, when the hot water from the water heater 201 is not supplied, the hot water in the circulation channel is circulated by driving the circulation pump and the heater to circulate the hot water in the circulation channel while raising the temperature. Is maintained at a constant temperature.

  As described above, according to each of the above embodiments, the double pipe joint is divided into the outer pipe joints 21, 51, 81, 111, 141 and the inner pipe joints 22, 52, 82, 112, 142. 81, 111, 141 and the inner pipe joints 22, 52, 82, 112, 142 are inner pipe joints 22, 52, 82, 112, 142 of the double pipe joints, and the inner pipe into which the inner pipe 11 is inserted outward. By adopting a configuration having the connection allowances 46, 48, 76, 78, 106, 108, 136, 166, an existing pipe joint for the single pipe 16 is replaced with a part of the double pipe joint (the outer pipe joints 21, 51). 81, 111, 141). That is, in order to prepare many kinds of double pipe joints, existing many kinds of pipe joints can be used as a part thereof, and resource saving can be achieved. In addition, since the inner pipe 11 is connected to the inner pipe connection allowances 46, 48, 76, 78, 106, 108, 136, and 166, the inner pipe 11 can be easily connected. The flow path outside the inner tube 11 (the flow path outside the inner tube) is not obstructed, and a sufficient flow channel can be secured outside the inner tube 11.

  Further, in the inner pipe abutting portions 47, 49, 77, 79, 107, 109, 137, and 167 of the inner pipe connection ports 41, 42, 71, 72, 101, 102, 131, and 161, the end face of the inner pipe 11 is The position of the inner tube 11 is regulated so that the inner tube 11 is located on the inner side or the same position as the end surface of the outer tube 12 connected to the outer tube joints 21, 51, 81, 111, 141. The double tube 10 whose end surface protrudes from the end surface of the outer tube 12 or the double tube 10 in which the end surface of the inner tube 11 and the end surface of the outer tube 12 are flush with each other can be used. That is, it is possible to avoid the use of the double tube 10 in which the end surface of the inner tube 11 enters the inner side of the end surface of the outer tube 12. Therefore, the inner pipe 11 can be easily connected to the inner pipe connection ports 41, 42, 71, 72, 101, 102, 131, 161.

  Furthermore, the use of resin as the inner pipe 11, the outer pipe 12, and the outer pipe joints 21, 51, 81, 111, 141 can provide a hot water supply piping system SY that is inexpensive and has high corrosion resistance. .

  In addition, the outer pipe 12 having a nominal diameter that is two sizes larger than the inner pipe 11 is used, so that the balance of the cross-sectional area of the two flow paths of the inner pipe inner flow path and the inner pipe outer flow path (volume balance). ) Can be balanced appropriately.

  In the first embodiment, the second embodiment, and the third embodiment, in the state where one double pipe 10 is connected to the inner pipe joints 22, 52, 82 and the outer pipe joints 21, 51, 81, the other Since the inner tube connection allowances 48, 78, 108 of the inner tube connection ports 42, 72, 102 for connecting the inner tube 11 of the double tube 10 protrude from the outer tube joints 21, 51, 81, 1 After the inner pipe joints 22, 52, 82 and the outer pipe joints 21, 51, 81 are connected to the double pipe 10, the inner pipe 11 of the other double pipe 10 is connected to the inner pipe connection ports 42, 72, 102. It can be easily connected.

  In the first embodiment, as shown in FIG. 11, the first inner pipe connection port 41 includes a positioning member 220 for positioning the position of the inner pipe joint 22 at the center in the outer pipe joint 21. It may be. In such a case, the positioning member 220 extends radially outward from the inner tube abutting portion 47 and is formed in a plate shape and a wheel shape in front view. The outer peripheral end of the positioning member 220 is in contact with the inner peripheral surface of the outer pipe connection allowance 36, and the positioning member 220 functions as a spacer, thereby positioning the inner pipe joint 22 in the radial direction with respect to the outer pipe joint 21. Is done. Further, the positioning member 220 is seated on the outer tube abutting portion 37 and is sandwiched between the outer tube abutting portion 37 and the outer tube 12. According to such a configuration, it is possible to avoid a situation in which the position of the inner pipe joint 22 is displaced from the center in the outer pipe joint 21. Further, since the positioning member 220 is seated on the outer tube abutting portion 37 and is sandwiched between the outer tube abutting portion 37 and the outer tube 12, the inner tube joint 22 is connected to the outer tube joint 21. Avoid tilting.

  In the second embodiment, the present invention is applied to a double pipe joint (so-called 90 ° elbow type) that connects two double pipes 10 vertically. As long as the heavy pipes 10 are connected at an angle, the present invention is not limited to this. That is, the present invention may be applied to a double pipe joint (so-called 45 ° elbow type) in which two double pipes 10 are connected at an angle of 45 °. The present invention may be applied to a double pipe joint (so-called 180 ° elbow type) that is connected with an angle of 180 °.

  Further, in each of the above embodiments, the inner pipe joints 22, 52, 82, 112, 142 are made of metal joints, but the inner pipe joints 22, 52, 82, 112, 142 are made of resin joints. Also good.

  10: Double pipe, 11: Inner pipe, 12: Outer pipe, 20: Double pipe socket, 21: Outer pipe joint, 22: Inner pipe joint, 41: First inner pipe connection port, 42: Second inner pipe Connection port, 46: Inner tube connection allowance, 47: Inner tube contact portion, 48: Inner tube connection allowance, 49: Inner tube contact portion, 50: Double tube elbow, 51: Outer tube joint, 52: Inner tube Joint: 71: 1st inner pipe connection port, 72: 2nd inner pipe connection port, 76: Inner pipe connection allowance, 77: Inner pipe abutment part, 78: Inner pipe connection allowance, 79: Inner pipe abutment part, 80: Double tube cheese, 81: Outer tube joint, 82: Inner tube joint, 101: First inner tube connection port, 102: Second inner tube connection port, 103: Third inner tube connection port, 106: Inner tube Connection fee 107: Inner tube abutting portion 108: Inner tube connection fee 109: Inner tube abutting portion

Claims (12)

The outer pipes of a straight type double pipe joint that linearly connects double pipes composed of an inner pipe having a flow path inside and an outer pipe having a flow path in the gap between the inner pipes. An inner pipe joint that is disposed inside the outer pipe joint and connects the inner pipes,
A first inner pipe connection port for connecting the inner pipe of one of the double pipes;
A second inner pipe connection port for connecting the inner pipe of the other double pipe,
Each inner tube connection port, have a connection allowance each inner tube is inserted into the outside,
The first inner pipe connection port and the second inner pipe connection port are integrally formed,
The connection allowance of the second inner pipe connection port is that of the one double pipe in a state where the inner pipe of the one double pipe is inserted into the connection allowance of the first inner pipe connection port. An inner pipe joint formed so as to protrude from the outer pipe joint connected to the outer pipe . The outer tube of an “L” -shaped double pipe joint that vertically connects a double tube comprising an inner tube having a flow path therein and an outer tube having a flow path in a gap between the inner tube and the inner pipe. An inner pipe joint that is disposed inside an outer pipe joint that connects the inner pipes and connects the inner pipes,
A first inner pipe connection port for connecting the inner pipe of one of the double pipes;
A second inner pipe connection port for connecting the inner pipe of the other double pipe,
Each inner tube connection port, have a connection allowance each inner tube is inserted into the outside,
The first inner pipe connection port and the second inner pipe connection port are formed as separate bodies and are configured to be joinable in the outer pipe joint. . The connection allowance of the second inner pipe connection port is such that the inner pipe of the one double pipe is inserted into the connection allowance of the first inner pipe connection port and the second inner pipe connection port is connected to the second inner pipe connection port. in a state joined to the first inner pipe connecting port, so as to protrude from the outer tube joint connected to the outer tube of said one of the double pipe, wherein it is formed to claim 2, characterized in Inner pipe joint. About three double pipes composed of an inner pipe having a flow path inside and an outer pipe having a flow path in the gap between the inner pipes, the two double pipes are linearly A “T” -shaped double pipe joint that connects the double pipes perpendicularly to the two double pipes is disposed inside an outer pipe joint that connects the outer pipes and the inner pipes are connected to each other. An inner pipe joint for connecting
A first inner pipe connection port and a second inner pipe connection port for connecting the two double pipes, respectively;
A third inner pipe connection port for connecting the one double pipe,
Each inner tube connection port, have a connection allowance each inner tube is inserted into the outside,
The first inner pipe connection port and the second inner pipe connection port are integrally formed,
The third inner pipe connection port is configured to be able to be joined in the outer pipe joint to an integrated body of the first inner pipe connection port and the second inner pipe connection port. Inner pipe joint. The connection allowance of the second inner pipe connection port is set in the outer tube of the double pipe in a state where the inner pipe of the double pipe is inserted into the connection allowance of the first inner pipe connection port. The inner pipe joint according to claim 4 , wherein the inner pipe joint is formed so as to protrude from the connected outer pipe joint. The connection allowance of the third inner tube connection port is such that the inner tube of the double tube is inserted into the connection allowance of the first inner tube connection port, and the third inner tube connection port is connected to the integral object. 6. The inner pipe joint according to claim 4 , wherein the inner pipe joint is formed so as to protrude from the outer pipe joint connected to the outer pipe of the double pipe in a state of being joined to the outer pipe. A double pipe composed of an inner pipe having a flow path inside and an outer pipe having a flow path in the gap between the inner pipe and two single pipes are connected, and the inner pipe is connected to one of the single pipes. Further, a double pipe joint for connecting the outer pipe to the other single pipe is disposed inside an outer pipe joint in which the outer pipe and the two single pipes are connected, and the inner pipe is Connected inner pipe joints,
An inner pipe connection port for connecting the inner pipe;
A communication member that communicates with the inner pipe connection port, and communicates the inner pipe connection port with the one single pipe connected to the outer pipe joint;
The inner pipe connection port has a connection allowance for inserting the inner pipe to the outside,
The communicating member is seated on a single pipe abutting portion where an end face of the one single pipe in the outer pipe joint abuts, and is sandwiched between the single pipe abutting part and the end face of the one single pipe An inner pipe joint characterized by having a portion. A double pipe joint in which a double pipe composed of an inner pipe that forms a flow path inside and an outer pipe that forms a flow path in the gap between the inner pipe and a connection pipe of a water supply or hot water supply terminal is connected, An inner pipe joint disposed inside the outer pipe joint to which the outer pipe and the connecting pipe are connected and to which the inner pipe is connected,
An inner pipe connection port for connecting the inner pipe;
A communication member that communicates with the inner tube connection port and communicates the inner tube connection port with the connecting tube connected to the outer tube joint;
The inner pipe connection port has a connection allowance for inserting the inner pipe to the outside,
The communication member has a flange portion that is seated on an abutting portion where an end surface of the connecting tube abuts on the outer tube joint, and is sandwiched between the abutting portion and an end surface of the connecting tube. Inner pipe joint. The inner pipe connection port further has an inner pipe abutting portion that abuts the end face of the inner pipe inserted into the connection allowance and regulates the position of the inner pipe,
The inner tube abutting portion regulates the position of the inner tube so that the end surface of the abutted inner tube comes to the inner side or the same position as the end surface of the outer tube connected to the outer tube joint. The inner pipe joint according to any one of claims 1 to 6 , wherein: The double pipe joint comprising the inner pipe joint according to any one of claims 1 to 9 and the outer pipe joint;
A piping system comprising: the double pipe comprising the inner pipe and the outer pipe. The inner tube and the outer tube are both resin tubes,
The piping system according to claim 10 , wherein the outer pipe joint is a resin joint. The piping system according to claim 10 or 11 , wherein the outer pipe is two sizes larger than the inner pipe in a nominal diameter.

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