JP6173175B2 - Multiple piping - Google Patents

Description

  The present invention relates to multiple piping.

  Conventionally, for example, a multiple pipe as described in Patent Document 1 below is known. The multiple pipe includes a first multiple pipe disposed on one side in the pipe axis direction and a second multiple pipe disposed on the other side in the pipe axis direction. The first multiple pipe surrounds the first inner pipe in which the first inner circuit is provided on the inner side in the radial direction, and the first inner pipe from the outer side in the radial direction, and the first outer circuit between the first inner pipe and the first inner pipe. Is provided with a first outer tube. The second multiple pipe surrounds the second inner pipe in which the second inner circuit is provided on the inner side in the radial direction, and the second inner pipe from the outer side in the radial direction, and the second outer circuit between the second inner pipe and the second inner pipe. Is provided with a second outer tube. And in this multiple pipe, both these multiple pipes move close to the pipe axis direction, so that the other end of each of the first inner pipe and the first outer pipe, the second inner pipe and the second outer pipe, respectively. And a first inner circuit and a second inner circuit, wherein the first inner circuit and the second inner circuit are connected to each other so as to be slidable in the pipe axis direction. An external connection circuit is formed by connecting the external circuit.

Japanese Patent Laid-Open No. 2002-349783

  However, in the conventional multiple pipe, the length in the pipe axis direction of the multiple pipe cannot be adjusted in a state where the connection internal circuit and the connection external circuit are formed.

  This invention is made | formed in view of the situation mentioned above, Comprising: It aims at providing the multiple piping which can adjust length in the state in which the circuit in a connection and the circuit outside a connection were formed.

In order to solve the above problems, the present invention proposes the following means.
The multiple pipe according to the present invention surrounds the first inner pipe provided with a first inner circuit on the inner side in the radial direction, and the first inner pipe from the outer side in the radial direction, and between the first inner pipe and the first inner pipe. A first multiple pipe having a first outer pipe provided with a first outer circuit, arranged on one side in the pipe axis direction, and a second inner pipe provided with a second inner circuit inside in the radial direction; And a second outer pipe that surrounds the second inner pipe from the outside in the radial direction and is provided with a second outer circuit between the second inner pipe and is disposed on the other side in the pipe axis direction. A second multiple pipe, and both the multiple pipes move closer to each other in the direction of the pipe axis so that the other end of each of the first inner pipe and the first outer pipe and the second inner pipe The pipe and the end on the one side of each of the second outer pipes are slidably fitted to each other in the pipe axis direction so that the first inner circuit and the second inner circuit are connected. An internal connection circuit and an external connection circuit formed by connecting the first external circuit and the second external circuit, wherein the first internal pipe is connected to the first external pipe. An urging pipe portion urged toward the other side, and a fitting pipe portion slidably fitted in an end of the other side of the urging pipe portion in the pipe axis direction; The second inner pipe and the second outer pipe are fixed in the pipe axis direction, and the multiple pipes move closer to the pipe axis direction in the first outer pipe and the second outer pipe. Sometimes, by engaging each other, there are separately provided restricting parts for restricting further approach movement of the multiple pipes, and the multiple pipes are moved close to each other in the pipe axis direction, and the fitting pipe part and the first 2 inner pipes, and the first outer pipe and the second outer pipe are fitted separately from each other, and the urging pipe portion and the second inner pipe are connected to a piping shaft. When brought into contact countercurrently, in a state in which the restricting portions are spaced pipe axis direction, characterized in that the connection in the circuit and the connection outer circuit is formed.

In this invention, both the multiple pipes are moved close to each other in the pipe axis direction, and the fitting pipe part and the second inner pipe, and the first outer pipe and the second outer pipe are fitted separately, and the urging pipe part When the first inner pipe and the second inner pipe are brought into contact with each other in the pipe axis direction, the connection inner circuit and the connection outer circuit are formed in a state where the restricting portions are separated from each other in the pipe axis direction. Therefore, when both the multiple pipes are moved closer to each other in the pipe axis direction after that, the first outer pipe and the second outer pipe can be slid in the pipe axis direction until the restricting portions engage with each other. The length of this multiple pipe can be shortened. At this time, the urging pipe part and the second inner pipe move toward the one side with respect to the first outer pipe while resisting the urging force acting on the urging pipe part, and the fitting pipe part and The second inner pipe slides in the pipe axis direction.
According to this multiple pipe, the length of the multiple pipe can be shortened and the length of the multiple pipe can be adjusted in a state where the connection internal circuit and the connection external circuit are formed.
By the way, the first inner pipe, such as this multiple pipe, is not configured to have a biasing pipe section and a fitting pipe section that are slidably fitted to each other in the pipe axis direction. In a configuration in which the two outer pipes have two tubular bodies that are slidably fitted to each other in the pipe axis direction, foreign matter enters and fixes between these tubular bodies from the outside of the multiple pipe. For example, sliding in the pipe axis direction of both tubular bodies may be unintentionally restricted.
On the other hand, in this multiple pipe, the first inner pipe having the urging pipe part and the fitting pipe part that are slidably fitted to each other in the pipe axial direction is formed from the outside in the radial direction by the first outer pipe. Since it is enclosed, it can be made difficult for foreign matter to reach the first inner pipe from the outside of the multiple pipe. As a result, it is possible to surely slide both pipe parts in the pipe axis direction while suppressing unintentional regulation of sliding of both pipe parts of the first inner pipe in the pipe axis direction. Can be adjusted smoothly.
When the energizing tube portion and the second inner tube move toward the one side with respect to the first outer tube, the energizing tube portion protrudes from the first outer tube toward the one side. In this case, it is possible to determine whether or not the in-connection circuit and the out-of-connection circuit are formed based on the protruding amount of the biasing tube portion from the first outer tube.

  The fitting tube portion is urged toward the other side with respect to the first outer tube to close the first outer circuit, and is pushed into the one side to push the first tube. 1 The outer circuit may be released from being closed.

In this case, the fitting tube portion is urged toward the other side with respect to the first outer tube to close the first outer circuit, so that the multiple tube is in a state before being moved close to each other. , It is possible to prevent foreign matter from reaching the first inner pipe through the first outer circuit, and to reliably prevent unintentional regulation of sliding in the pipe axis direction of both pipe portions. . In addition, since the fitting tube portion itself closes the first outer circuit, it is not necessary to provide a separate member for closing the first outer circuit, and an increase in the number of parts of the multiple pipe can be suppressed. .
Moreover, since the closing of the first outer circuit is released by pushing the fitting pipe part toward the one side, when the multiple pipes move close to each other in the pipe axis direction, the fitting pipe part is By pushing in toward the one side by the second multiple pipe, the closing of the first outer circuit can be reliably released.

  Further, between the second inner pipe and the second outer pipe, the second outer circuit is closed by being urged toward the one side and pushed toward the other side. An outer closing body for releasing the closing of the second outer circuit is provided, and the fitting tube portion and the outer closing body are contacted in the pipe axis direction when the multiple pipes move closer to the pipe axis direction. You may push in contact.

In this case, since the outer closing body is provided between the second inner pipe and the second outer pipe, the second outer circuit can be closed in a state before the multiple pipes are moved close to each other. For example, foreign matter can be prevented from entering the second outer circuit.
In addition, when both the multiple pipes move close to each other in the pipe axis direction, the fitting pipe part and the outer closing body come into contact with each other in the pipe axis direction, so that these fitting pipe parts and the outer closing body are brought into contact with each other. When they are pushed together, the fitting tube portion and the second inner tube can be fitted together, and the in-connection circuit can be reliably formed.

  In addition, the first outer tube may be provided with a support portion that contacts and supports the biasing tube portion and the fitting tube portion from the other side.

  In this case, since the support portion is provided in the first outer tube, the urging force acting on the urging tube portion and the fitting tube portion is separately received by the support portion, and the urging tube portion and the fitting tube portion are It becomes possible to suppress the urging force acting on one of them from affecting the other, and it is possible to easily adjust the urging force acting on the urging tube portion and the fitting tube portion.

  According to the multiple piping which concerns on this invention, length can be adjusted in the state in which the circuit in a connection and the circuit outside a connection were formed.

It is a fragmentary longitudinal cross-section which shows the connection structure provided with the multiple piping which concerns on one Embodiment of this invention. FIG. 2 is a half cross-sectional view of a first multiple pipe constituting the multiple pipe shown in FIG. 1. FIG. 2 is a half cross-sectional view of a second multiple pipe constituting the multiple pipe shown in FIG. 1. FIG. 2 is a half cross-sectional view of the multiple pipe shown in FIG. 1, showing a state where both multiple pipes are moved close to each other in the pipe axis direction. FIG. 5 is a half sectional view of the multiple pipe shown in FIG. 1, and shows a state in which both multiple pipes are moved closer to the pipe axis direction from the state shown in FIG. 4. FIG. 6 is a half cross-sectional view of the multiple pipe shown in FIG. 1, showing a state in which both multiple pipes are further moved closer to the pipe axis direction from the state shown in FIG. 5. FIG. 7 is a half cross-sectional view of the multiple pipe shown in FIG. 1, showing a state in which both multiple pipes are further moved closer to the pipe axis direction from the state shown in FIG. 6.

  Hereinafter, a connection structure including multiple piping according to an embodiment of the present invention will be described with reference to the drawings. A connection structure 10 as shown in FIG. 1 is employed, for example, when connecting ends of rods 11 constituting a screw in an excavator. The rod 11 is formed in a hollow rod shape, and ends of the rod 11 are fitted and fixed to each other.

  A multiple pipe 20 (multiple pipe joint) is provided at the end of each rod 11. A plurality of independent circuits are concentrically formed in the multiple pipe 20, and in the illustrated example, a double structure is formed in which circuits are formed in a double manner. A fluid (liquid) such as hydraulic fluid flows in each circuit of the multiple pipe 20.

In each circuit, fluids of different types may flow, or fluids of different flow directions may flow. For example, when the circuit is formed in a double manner as shown in the example in the figure, the flow direction is reversed between the inner circuit and the outer circuit, and the fluid is reciprocated by using each as a forward path or a return path. Also good.
Further, a fluid (liquid) such as cement milk may be allowed to flow in the hollow portion of the rod 11 and outside the multiple pipe 20.

  The multiple pipe 20 includes a first multiple pipe 21 (body, female fitting) and a second multiple pipe 22 (nose, male fitting). Both the multiple tubes 21 and 22 are fixed in the respective end portions of the rods 11 different from each other.

  Here, the central axes of the multiple tubes 21 and 22 are located on a common axis. Hereinafter, this common axis is referred to as a pipe axis O, the first multiple pipe 21 side is referred to as one side, the second multiple pipe 22 side is referred to as the other side, and the direction perpendicular to the pipe axis O is along the pipe axis O direction. Is referred to as the radial direction, and the direction around the pipe axis O is referred to as the circumferential direction.

  As shown in FIG. 2, the first multiple tube 21 includes a first inner tube 23 and a first outer tube 24. The first inner tube 23 and the first outer tube 24 are arranged coaxially with each other, and the first outer tube 24 surrounds the first inner tube 23 from the outside in the radial direction.

  The first outer tube 24 includes one tube 24a located on one side and the other tube 24b located on the other side. Both the tubes 24a and 24b are fixed in a liquid-tight manner by, for example, screwing or fitting. An annular elastic sealing material is fitted in the other end of the other tube 24b.

  The first outer tube 24 is provided with support portions 25 and 26. The support portions 25 and 26 are formed in an annular shape coaxial with the piping axis O, and a plurality of supporting portions 25 and two in the illustrated example are provided at intervals in the piping axis O direction. The support portions 25 and 26 are provided with a first support portion 25 located on one side and a second support portion 26 located on the other side. The 1st support part 25 is provided in the one pipe | tube 24a, and the 2nd support part 26 is provided in the other pipe | tube 24b. The first support portion 25 is provided with a through hole penetrating in the pipe axis O direction.

  A fixing ring 27 is fixed to the first outer tube 24. The fixing ring 27 is disposed coaxially with the piping axis O, is fitted in the first outer pipe 24, and is fixed to the first outer pipe 24 in the direction of the piping axis O. The fixing ring 27 is disposed on a portion of the one tube 24a located on one side of the first support portion 25. The fixing ring 27 is formed with a through hole penetrating in the pipe axis O direction.

The first inner pipe 23 is slid in the direction of the pipe axis O on the urging pipe part 28 urged toward the other side with respect to the first outer pipe 24 and the other end part of the urging pipe part 28. And a fitting tube portion 29 fitted in a movable manner.
The urging tube portion 28 includes one tube 28a located on one side and the other tube 28b located on the other side. One end of the other tube 28b is fitted in a liquid-tight manner to the other end of the one tube 28a, and both the tubes 28a and 28b are fixed in the direction of the pipe axis O.

  One end portion of the urging tube portion 28 protrudes from one opening end edge of the first outer tube 24 toward one side. The opening end edge on the other side of the urging tube portion 28 is located on one side with respect to the opening end edge on the other side of the first outer tube 24 and on the other side with respect to the second support portion 26. The urging pipe portion 28 is fitted into the fixed ring 27 so as to be slidable in the direction of the pipe axis O, and is inserted into the support portions 25 and 26 so as to be movable in the direction of the pipe axis O.

  The urging pipe portion 28 is provided with an engaging portion 30. The engaging portion 30 protrudes radially outward from the outer peripheral surface of the urging tube portion 28 and engages with the first support portion 25 from one side. The engaging portion 30 is engaged with a portion of the first support portion 25 located on the inner side in the radial direction with respect to the through hole so as to be separated toward one side.

  The biasing pipe portion 28 is biased by the first outer biasing member 31. The first outer biasing member 31 is formed by a spring such as a coil spring, for example. The first outer biasing member 31 is interposed between the fixing ring 27 and the engaging portion 30. The urging force acting on the urging pipe portion 28 from the first outer urging member 31 is received by the first support portion 25 via the engaging portion 30.

  The fitting tube portion 29 is inserted between the other tube 24 b of the first outer tube 24 and the other tube 28 b of the urging tube portion 28, and is positioned on the other side of the engagement portion 30 in the urging tube portion 28. The part is liquid-tightly fitted. The opening edge on one side of the fitting tube portion 29 and the engaging portion 30 are spaced apart so as to be accessible in the direction of the pipe axis O and face each other. The opening edge on the other side of the fitting tube portion 29 is located on the other side of the opening edge on the other side of the biasing tube portion 28, and is one side of the opening edge on the other side of the first outer tube 24. Located on the side. An annular elastic sealing material is fitted in the other end of the fitting tube portion 29.

  The fitting tube portion 29 is formed to be larger in the pipe axis O direction than the second support portion 26 of the first outer tube 24 and is opposed to the second support portion 26 from the inside in the radial direction. A communication gap 32 extending in the direction of the pipe axis O is provided between the outer peripheral surface of the pipe portion 29 and the inner peripheral surface of the second support portion 26.

  The first multiple tube 21 is provided with a first inner circuit 33 and a first outer circuit 34. The first inner circuit 33 and the first outer circuit 34 each open toward both sides in the pipe axis O direction. The first inner circuit 33 is configured by the inside of the first inner tube 23 and extends over the entire length of the first inner tube 23 in the direction of the piping axis O. The first outer circuit 34 is provided between the first outer tube 24 and the first inner tube 23. The first outer circuit 34 is provided over the entire length in the direction of the pipe axis O between the inner peripheral surface of the first outer tube 24 and the outer peripheral surface of the first inner tube 23.

Here, the first inner circuit 33 is opened and closed by the first inner closing member 35, and the first outer circuit 34 is opened and closed by the fitting tube portion 29.
The first inner closing body 35 closes the first inner circuit 33 by being urged toward the other side with respect to the urging pipe portion 28, and is pushed toward one side to be pushed into the first inner circuit 33. Release the closure. The first inner closing body 35 is urged toward one side by the first inner urging member 36, and comes into contact with the inner surface of the opening on the other side of the first inner tube 23 from one side, thereby opening the opening. Blocked. The first inner biasing member 36 is interposed between the first support tube portion 37 fitted in the other tube 28 b of the biasing tube portion 28 and the first inner closing member 35. The first inner biasing member 36 is supported by the one tube 28 a of the biasing tube portion 28 via the first support tube portion 37.

  The fitting tube part 29 closes the first outer circuit 34 by being urged toward the other side with respect to the first outer tube 24, and is pushed toward the one side so that the first outer circuit 34 Release the closure. A closing protrusion 38 is formed on the fitting tube portion 29. The closing protrusion 38 protrudes in an annular shape from the outer peripheral surface of the fitting tube portion 29. The fitting tube portion 29 is urged toward the other side by the second outer urging member 39, and the closing projection 38 is brought into contact with the second support portion 26 of the first outer tube 24 from one side. The communication gap 32 is closed. The second outer biasing member 39 is interposed between the first support portion 25 and the closing projection 38 of the first outer tube 24. The urging force acting on the fitting tube portion 29 from the second outer urging member 39 is received by the second support portion 26 via the closing projection 38.

As shown in FIG. 3, the second multiple tube 22 includes a second inner tube 41 and a second outer tube 42. The second inner tube 41 and the second outer tube 42 are arranged coaxially with each other, and the second outer tube 42 surrounds the second inner tube 41 from the outside in the radial direction.
The second inner pipe 41 includes one pipe 41a located on one side and the other pipe 41b located on the other side, and both the pipes 41a and 41b are connected to each other by, for example, screwing or fitting. It is fixed liquid-tight. The second outer tube 42 includes one tube 42a located on one side and the other tube 42b located on the other side, and these two tubes 42a and 42b are mutually connected by, for example, screwing or fitting. It is fixed liquid-tight.

  The second inner pipe 41 and the second outer pipe 42 are formed in the same size in the pipe axis O direction. The second inner pipe 41 and the second outer pipe 42 are fixed in the direction of the pipe axis O, and between the second inner pipe 41 and the second outer pipe 42, relative to each other in the direction of the pipe axis O. A stopper portion 43 that restricts the movement is provided. The stopper portion 43 includes a stopper concave portion 43 a formed on the outer peripheral surface of the second inner tube 41 and a stopper convex portion 43 b formed on the inner peripheral surface of the second outer tube 42. The stopper concave portion 43a is formed in an annular shape extending in the circumferential direction, and the stopper convex portion 43b is formed in an annular shape in which an end portion on the inner side in the radial direction is fitted in the stopper concave portion 43a. A through hole penetrating in the direction of the pipe axis O is formed in the stopper convex portion 43b.

  The second multiple tube 22 is provided with a second inner circuit 44 and a second outer circuit 45. Each of the second inner circuit 44 and the second outer circuit 45 opens toward both sides in the direction of the piping axis O. The second inner circuit 44 is configured by the inside of the second inner pipe 41 and extends over the entire length of the second inner pipe 41 in the direction of the piping axis O. The second outer circuit 45 is provided between the second outer tube 42 and the second inner tube 41. The second outer circuit 45 is provided over the entire length in the direction of the pipe axis O between the inner peripheral surface of the second outer tube 42 and the outer peripheral surface of the second inner tube 41.

The second inner circuit 44 is opened and closed by a second inner closing body 46, and the second outer circuit 45 is opened and closed by an outer closing body 47.
The second inner closing body 46 closes the second inner circuit 44 by being urged toward the one side with respect to the second inner tube 41 and is pushed toward the other side so as to be pushed into the second inner circuit 44. Release the closure. The second inner closing body 46 is urged toward one side by the second inner urging member 48 and comes into contact with the inner surface of the opening on one side of the second inner tube 41 from the other side. Blocked. The second inner urging member 48 is interposed between the second support pipe portion 49 fitted in the one pipe 41 a of the second inner pipe 41 and the second inner closing body 46. The second inner urging member 48 is supported by the other pipe 41 b of the second inner pipe 41 via the second support pipe portion 49.

  The outer closing body 47 closes the second outer circuit 45 by being urged toward the one side with respect to the second inner tube 41 and closes the second outer circuit 45 by being pushed toward the other side. Is released. The outer closing body 47 is urged toward one side by the third outer urging member 50 and closes the opening by contacting the inner surface of the opening on one side of the second outer tube 42 from the other side. ing. The third outer biasing member 50 is interposed between a pedestal 51 provided on the second inner pipe 41 and the second inner closing body 46. The pedestal 51 protrudes annularly from the outer peripheral surface of the second inner tube 41 and is adjacent to the stopper recess 43a from one side.

  As shown in FIG. 4 to FIG. 7, in this multiple pipe 20, both the multiple pipes 21 and 22 move closer to the pipe axis O direction, so that the other side of each of the first inner pipe 23 and the first outer pipe 24. As shown in FIG. 6 and FIG. 7, the end portion and the one end portion of each of the second inner tube 41 and the second outer tube 42 are slidably fitted to each other in the direction of the pipe axis O. A connection internal circuit 52 formed by connecting the first internal circuit 33 and the second internal circuit 44 and a connection external circuit 53 formed by connecting the first external circuit 34 and the second external circuit 45 are formed.

  As shown in FIG. 1, when both the multiple pipes 21 and 22 are moved closer to the pipe axis O direction from the initial state where both the multiple pipes 21 and 22 are separated in the pipe axis O direction, first, as shown in FIG. The other end of the first outer tube 24 is fitted on the one end of the second outer tube 42. Further, when the other end portion of the fitting tube portion 29 comes into contact with one end portion of the outer closing body 47 and then the multiple tubes 21 and 22 are further moved closer to each other, FIG. 5 and FIG. As shown, the fitting tube portion 29 and the outer closing body 47 are pushed in the direction of the pipe axis O. At this time, first, the fitting tube portion 29 slidably moves on the urging tube portion 28 in the direction of the piping axis O while the second outer urging member 39 is compressed and deformed, thereby releasing the first outer circuit 34 from closing. After that, the outer closing body 47 slides on the second inner pipe 41 in the direction of the pipe axis O while releasing and closing the second outer circuit 45 while compressing and deforming the third outer biasing member 50. As a result, the first external circuit 34 and the second external circuit 45 are connected, and the external connection circuit 53 is formed.

  Also, as shown in FIG. 4, both the multiple tubes 21 and 22 are moved closer together from the state in which the other end of the first outer tube 24 is fitted on the one end of the second outer tube 42. 5 and FIG. 6, the first inner closing body 35 and the second inner closing body 46 are pressed against each other in the direction of the pipe axis O, and the other end of the fitting tube portion 29 The part is fitted on the end of one side of the second inner tube 41. At this time, as shown in FIG. 6, the first internal circuit 33 and the second internal circuit 44 are released by releasing the closure of the first internal circuit 33 and the second internal circuit 44 by the internal closure members 35 and 46. Are connected, and the in-connection circuit 52 is formed.

  Here, as shown in FIG. 6, in a state where the connection inner circuit 52 and the connection outer circuit 53 are formed, the fitting tube portion 29 and the second inner tube 41, the first outer tube 24 and the second outer tube 42, , And the urging pipe portion 28 and the second inner pipe 41 abut on the pipe axis O direction. At this time, the second support portion 26 of the first outer tube 24 and the opening edge 42c on one side of the second outer tube 42 are separated from each other in the direction of the pipe axis O.

  Thereafter, when the multiple pipes 21 and 22 are further moved closer to the pipe axis O direction, the fitting pipe portion 29 and the second inner pipe 41 slide in the pipe axis O direction as shown in FIG. The urging tube portion 28 and the second inner tube 41 move toward one side with respect to the first outer tube 24 while compressing and deforming the first outer urging member 31, and the urging tube portion 28 The amount of protrusion from one outer tube 24 toward one side increases. At this time, the second outer tube 24 and the second outer tube 24 and the first outer tube 24 are connected to the first outer tube 24 while the second support portion 26 of the first outer tube 24 and the open end edge 42c on one side of the second outer tube 42 approach each other. 2 The outer pipe 42 slides in the direction of the pipe axis O, and the length of the multiple pipe 20 is shortened.

  When the second support portion 26 of the first outer tube 24 and the open end edge 42c on one side of the second outer tube 42 are in contact with each other and engaged, the multiple tubes 21 and 22 are further moved closer together. Be regulated. The second support portion 26 of the first outer pipe 24 and the opening end edge 42c on one side of the second outer pipe 42 are engaged with each other when the multiple pipes 21 and 22 move closer to the pipe axis O direction. Thus, a restricting portion 54 that restricts further approach movement of both the multiple tubes 21 and 22 is configured.

As described above, according to the multiple piping 20 according to the present embodiment, it is possible to shorten the length of the multiple piping 20 in a state where the connection internal circuit 52 and the connection external circuit 53 are formed. The length of the multiple pipe 20 can be adjusted.
Thereby, for example, in the connection structure 10 of the present embodiment, even if some manufacturing error occurs in the rod 11 in the direction of the pipe axis O, the length of the multiple pipe 20 is adjusted to influence the manufacturing error. Can be reduced.

  As in the present embodiment, when the biasing tube portion 28 and the second inner tube 41 move toward one side with respect to the first outer tube 24, the biasing tube portion 28 is moved to the first outer tube. When projecting toward one side from 24, whether or not the connection internal circuit 52 and the connection external circuit 53 are formed based on the protrusion amount of the biasing tube portion 28 from the first outer tube 24. Can be determined.

By the way, the first inner pipe 23 such as the multiple pipe 20 is not configured to have an urging pipe section 28 and a fitting pipe section 29 that are slidably fitted to each other in the pipe axis O direction. In a configuration in which the outer pipe 24 and the second outer pipe 42 have two tubular bodies that are slidably fitted to each other in the pipe axis direction, between the two pipe bodies from the outside of the multiple pipe 20. For example, when foreign matter such as cement milk enters and adheres, the sliding of both tubular bodies in the direction of the pipe axis O may be unintentionally restricted.
In contrast, in the multiple pipe 20, the first inner pipe 23 having the urging pipe part 28 and the fitting pipe part 29 slidably fitted to each other in the pipe axis direction is formed by the first outer pipe 24. Since it is surrounded from the outside in the radial direction, it is possible to make it difficult for foreign matter to reach the first inner pipe 23 from the outside of the multiple pipe 20. As a result, unintentional regulation of the sliding of the both pipe portions 28 and 29 of the first inner pipe 23 in the direction of the piping axis O is suppressed and the both pipe portions 28 and 29 are reliably slid in the direction of the piping axis O. Therefore, the length of the multiple pipe 20 can be adjusted smoothly.

Further, since the fitting tube portion 29 is biased toward the other side with respect to the first outer tube 24 to close the first outer circuit 34, before the multiple tubes 21 and 22 are moved closer to each other. In this state, it is possible to suppress the foreign matter from reaching the first inner pipe 23 through the first outer circuit 34, and the sliding of both pipe portions 28 and 29 in the direction of the pipe axis O is unintentionally restricted. Can be reliably suppressed. Moreover, since the fitting tube portion 29 itself closes the first outer circuit 34, it is not necessary to provide a separate member for closing the first outer circuit 34, and the number of parts of the multiple pipe 20 is increased. Can be suppressed.
Moreover, since the closing of the 1st outer circuit 34 is cancelled | released because the fitting pipe part 29 is pushed toward one side, when both the multiple pipes 21 and 22 move close to the piping axis O direction, this By pushing the fitting tube portion 29 toward the one side by the second multiple tube 22, the closing of the first outer circuit 34 can be reliably released.

In addition, since the outer closing body 47 is provided between the second inner tube 41 and the second outer tube 42, the second outer circuit 45 is connected to the multiple tubes 21 and 22 before moving closer. It is possible to keep the door closed, and for example, foreign matter can be prevented from entering the second outer circuit 45.
Further, when both the multiple pipes 21 and 22 move closer to the pipe axis O direction, the fitting pipe portion 29 and the outer closing body 47 are pressed against each other in the pipe axis O direction. When the portion 29 and the outer closing body 47 are pushed together, the fitting tube portion 29 and the second inner tube 41 can be fitted together, and the in-connection circuit 52 can be reliably formed. .

  Further, since the support portions 25 and 26 are provided on the first outer tube 24, the urging forces acting on the urging tube portion 28 and the fitting tube portion 29 are received by the support portions 25 and 26, respectively, and urged. The biasing force acting on one of the tube portion 28 and the fitting tube portion 29 can be suppressed from affecting the other, and the biasing force acting on the biasing tube portion 28 and the fitting tube portion 29. Can be easily adjusted.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the modified example of the present invention, the first inner blocking body 35, the second inner blocking body 46, and the outer blocking body 47 may not be provided.

  Moreover, in the said embodiment, the fitting pipe part 29 closes the 1st outer circuit 34 by being urged | biased toward the other side with respect to the 1st outer pipe 24, and is pushed in toward one side. The closing of the first outer circuit 34 is released, but the present invention is not limited to this. For example, in the modification of the present invention, the fitting tube portion does not have to close the first outer circuit.

  In the embodiment, when the urging tube portion 28 and the second inner tube 41 move toward one side with respect to the first outer tube 24, the urging tube portion 28 is moved from the first outer tube 24. Although protruding toward one side, the present invention is not limited to this. For example, in the modified example of the present invention, the biasing pipe portion adopts a configuration that is shorter in the pipe axis direction than the biasing pipe portion 28 in the embodiment, and the biasing pipe portion and the second inner pipe are the first outer pipe. However, when moving toward one side, the urging tube portion may not protrude toward the one side from the first outer tube.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

20 Multiple piping 21 First multiple tube 22 Second multiple tube 23 First inner tube 24 First outer tube 25, 26 Support portion 28 Energizing tube portion 29 Fitting tube portion 33 First inner circuit 34 First outer circuit 41 First 2 inner pipe 42 second outer pipe 44 second inner circuit 45 second outer circuit 52 connection inner circuit 53 connection outer circuit 54 restriction part O piping shaft

Claims (4)

A first inner pipe in which a first inner circuit is provided on the inner side in the radial direction, and the first inner pipe is surrounded from the outer side in the radial direction, and a first outer circuit is provided between the first inner pipe and the first inner pipe. A first multiple pipe having a first outer pipe and disposed on one side in the pipe axis direction;
A second inner pipe in which a second inner circuit is provided on the inner side in the radial direction, and the second inner pipe is surrounded from the outer side in the radial direction, and a second outer circuit is provided between the second inner pipe and the second inner pipe. A second multiple pipe having a second outer pipe and disposed on the other side in the pipe axis direction,
By moving both of these multiple pipes closer to each other in the pipe axis direction, the other end of each of the first inner pipe and the first outer pipe, the second inner pipe and the second outer pipe, respectively. An internal connection circuit in which the first inner circuit and the second internal circuit are connected to each other so as to be slidable with each other in the pipe axis direction, and the first external circuit And a multi-pipe in which an external connection circuit formed by connecting the second external circuit and the second external circuit is formed,
The first inner pipe is slid in a pipe axis direction on a biasing pipe portion biased toward the other side with respect to the first outer pipe, and an end portion on the other side of the biasing pipe portion. A fitting tube portion movably fitted, and
The second inner pipe and the second outer pipe are fixed in the pipe axis direction,
The first outer pipe and the second outer pipe have a restricting portion that engages with each other when the multiple pipes move closer to each other in the pipe axis direction, thereby restricting further movement of the multiple pipes. Provided separately,
The multiple pipes are moved close to each other in the pipe axis direction, the fitting pipe part and the second inner pipe, the first outer pipe and the second outer pipe are fitted separately, and the biasing When the pipe part and the second inner pipe are brought into contact with each other in the pipe axis direction, the connection internal circuit and the connection external circuit are formed in a state where the restriction parts are separated from each other in the pipe axis direction. Multiple piping characterized by The multiple piping according to claim 1,
The fitting tube portion is urged toward the other side with respect to the first outer tube to close the first outer circuit, and is pushed toward the one side to thereby push the first outer tube. Multiple piping characterized by releasing circuit closure. The multiple piping according to claim 2,
Between the second inner pipe and the second outer pipe, the second outer circuit is closed by being urged toward the one side, and is pushed into the other side to push the first (2) An outer closing body for releasing the closing of the outer circuit is provided,
The multiple pipe according to claim 1, wherein the fitting pipe portion and the outer block member are pressed in contact with each other in the pipe axis direction when the multiple pipes move in the pipe axis direction. The multiple pipe according to claim 2 or 3,
The multiple piping according to claim 1, wherein the first outer pipe is provided with a support portion that contacts and supports the biasing pipe portion and the fitting pipe portion from the other side.

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