JP2007263223A - Tube-joining tube fixing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow reliable and easy work for joining a clad tube and give cladding treatment thereto after joining work in a cost and efficiency advantageous manner. <P>SOLUTION: This tube-joining tube fixing tool comprises clamping and fixing means A for detachably clamping and fixing both clad tubes 2 each overcoated with a compressive cylindrical cladding material 1, at their tube ends 2A each exposed with the compressing operation of the cylindrical cladding material 1 in the direction of a tube axial center X, and a connection mean B for connecting both clamping and fixing means A to each other at a set clamping space L in set joining attitude. The clamping and fixing means A each have a receiving portion C for abutting on an end face 1a of the cylindrical cladding material 1 subjected to compressing operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention covers a coating material for heat insulation or sound absorption that is compressible in the tube axis direction formed in a cylindrical shape, such as a coated copper tube for refrigerant of an air conditioner or a coated copper tube for hot water supply / water supply. The present invention relates to an improvement in a tube holding technique in a case where the tube ends of a coated tube or the tube ends thereof and a pipe joint (socket) into which the tube ends are joined by welding means such as brazing.

  Conventionally, for example, when two coated copper pipes for refrigerant, which is an example of a clad pipe, are brazed at a construction site, a heat insulating material as a clad material sheathed on each clad copper pipe, After cutting and removing the length corresponding to the brazing work area, the exposed pipe ends of each coated copper pipe are fitted and connected to copper pipe fittings, and both ends of the pipe fittings placed on the brazing work table are connected. And a method of brazing the exposed tube ends to the exposed tube ends.

  In the above-described joining method, the exposed pipe end of the coated copper pipe and the pipe joint are likely to be relatively displaced before brazing, and the fitting depth between the exposed pipe end and the pipe joint becomes shallow. Therefore, it is necessary to braze the exposed pipe end portion against the pipe joint in a state of being pressed in the fitting direction, and it is easy to troubleshoot the brazing work. Moreover, after the brazing operation, it is necessary to coat the exposed pipe ends and pipe joints of both coated copper pipes with a new heat insulating material, so that the coating processing cost is likely to increase.

  The present invention has been made in view of the above-mentioned actual situation, and the main problem is that the joining operation of the cladding tube can be reliably and easily performed, and the coating treatment after the joining operation is also cost-effective and efficient. It is the point which provides the useful pipe fixing jig for pipe joining which can be advantageously performed on the surface.

  A first characteristic configuration according to the present invention is a tube end portion exposed by a compression operation in the tube axis direction of the tubular covering material, out of both cladding tubes covering a compressible tubular covering material. A holding and fixing means for detachably holding and fixing, and a connecting means for connecting the both holding and fixing means at a set holding interval and a set joining posture. The holding and fixing means or the connecting means includes a compressed tubular shape. The receiving portion is in contact with the end face of the covering material.

  According to the above-described characteristic configuration, for example, when two cladding tubes are joined together by welding means such as brazing at a construction site, the cylindrical sheathing material sheathed on each cladding tube is compressed in the axial direction of the tube. Then, the end of the cladding tube is exposed by the length corresponding to the joining work area, and the both holding and fixing means connected to the both ends of the exposed pipe by the connecting means at the set holding interval and the set joining posture are held. When mounted in a fixed state, the exposed tube ends of both cladding tubes are constrained to an appropriate set joint posture by the both holding and fixing means, and at the same time, a compression operation is performed by a receiving portion provided on the holding and fixing means or the connecting means. The applied covering material is maintained in a compressed state.

  Further, after the joining operation of both the cladding tubes, when the gripping and fixing means is released and removed from the exposed tube end portions of both cladding tubes, the cylindrical coating material in the compressed state is in an initial covering state by an elastic restoring force. Therefore, it is only necessary to coat the exposed part located between the ends of the restored covering materials.

  Therefore, the exposed tube ends of both cladding tubes can be fixed and held in an appropriate setting joining posture, so that the joining operation of both cladding tubes can be performed efficiently and reliably while facilitating handling. The coating treatment after work can be advantageously performed in terms of cost and work efficiency.

  According to a second characteristic configuration of the present invention, the connecting means includes a pair of connecting arms provided with the holding and fixing means, and a connecting arm in which the other end of the connecting arm is fixedly connected in a rotatable state. It is in the point comprised from.

  According to the above characteristic configuration, for example, when two cladding tubes are joined via a pipe joint selected from various joint shapes such as a straight tube shape and an elbow shape, both cladding tubes are formed according to the joint shape of the tube joint. Even when the joining posture of the two connecting arms is changed, by adjusting the orientation posture of the pair of connecting arms with respect to the connecting arm in response to the change, the holding and fixing means provided in the two connecting arms, It is possible to set the set holding interval and the set joining posture suitable for the joining posture of both the cladding tubes after the change.

  Furthermore, since the holding and fixing means or the connecting means is provided with a receiving portion that comes into contact with the end face of the compressed cylindrical covering material from the tube axis direction, the connecting arm and the connecting arm of the connecting means are fixed. Even if the tightening force for connection is insufficient or the tightening force is loosened, the elastic restoring force of the cylindrical covering material compressed in the tube axis direction is Since it acts as a biasing force in the direction in which the exposed tube ends are pushed together, the exposed tube ends of both cladding tubes can be reliably joined.

  A third characteristic configuration according to the present invention is that the connecting arm is provided with a length adjusting means capable of adjusting a set holding interval of the both holding and fixing means.

  According to the above characteristic configuration, for example, when two cladding tubes are joined via a pipe joint selected from various joint shapes such as a straight tube shape and an elbow shape, both cladding tubes are formed according to the joint shape of the tube joint. Even if the holding distance to the exposed tube end is changed, the holding interval of the holding and fixing means of both connecting arms can be set quickly and easily by the length adjusting means provided on the connecting arm. Can be changed.

  A fourth characteristic configuration according to the present invention is that the length adjusting means is configured by fixedly connecting a plurality of split connection arm portions of the connection arm in a rotatable state.

  According to the above characteristic configuration, by adjusting the plurality of split connecting arm portions of the connecting arm, the holding interval of both holding and fixing means can be quickly and easily changed to the set holding interval after the change. At the same time, the adjustment structure therefor can be configured easily and inexpensively.

  According to a fifth characteristic configuration of the present invention, the holding and fixing means includes a first holding member having a recess for receiving one side surface of the exposed tube end portion of the cladding tube, and the other side surface of the exposed tube end portion of the cladding tube. It is in the point comprised from the 2nd clamping member provided with the recessed part which accepts, and the fastener which moves both clamping members relatively close to the clamping side.

  According to the above-described characteristic configuration, the clamping members are relatively close to the clamping side by the tightening tool in a state where the cladding tube is stably received and supported between the concave portion of the first clamping member and the concave portion of the second clamping member. By moving, the exposed tube end portion of the cladding tube can be reliably and easily held and fixed.

[First Embodiment]
FIG. 1 to FIG. 3 show an example of a cladding tube 2 with a sheathing 1 formed in a cylindrical shape and compressible in the direction of the tube axis X. As the sheathing 1, a heat insulating material such as polyethylene foam is sheathed. The exposed pipe end portions 2A of the two coated copper pipes for refrigerant 2 are fitted and connected from both ends of a copper straight tubular pipe joint (socket) 6 from the tube axis X direction. The pipe fixing jig for pipe joining used when sealing both ends of the pipe joint 6 and the exposed pipe end 2A of the refrigerant coated copper pipe 2 by brazing, which is an example of a welding means, is shown.

  The pipe fixing jig for pipe joining is a pipe joining work area among the exposed pipe end portions 2A of both refrigerant coated copper pipes 2 exposed by the compression operation in the tube axis X direction of the tubular heat insulating material 1. A pair of gripping and fixing means A for detachably gripping and fixing a part away from the brazing work area, and a connecting means B for connecting the both gripping and fixing means A with a set gripping interval L and a set joining posture; Each holding and fixing means A is provided with a receiving portion C that comes into contact with the end surface 1a of the tubular heat insulating material 1 compressed in the tube axis X direction from the tube axis X direction, and the connecting means The connecting arm 8 of B is provided with length adjusting means D capable of adjusting the set holding interval L of the both holding and fixing means A.

  Each of the holding and fixing means A includes a belt-like first holding member 3 formed by bending a V-shaped recess 3A for receiving one side surface of the exposed pipe end 2A of both refrigerant coated copper pipes 2; A belt plate-like second holding member 4 formed by bending a V-shaped recess 4A for receiving the other side surface of the exposed pipe end 2A of both refrigerant-coated copper pipes 2 and both holding members 3, 4 The first tightening tool 5 is configured to move relatively close to the reduced diameter side, which is the tightening side, and has end faces 3a, 4a in the tube axis X direction in the receiving recesses 3A, 4A of the both holding members 3, 4. The receiving part C is configured.

  The first tightening tool 5 includes a through-hole 3b formed in the connecting plate portion 3B continuous on both sides of the receiving recess 3A in the first holding member 3, and both sides of the receiving recess 4A in the second holding member 4. Among the through holes 4b formed in the connecting plate portion 4B continuous with the bolt 5A inserted through the through holes 3b, 4b opposed to each other in the tightening direction, and the butterfly screwed into the protruding screw shaft portion thereof It is comprised from the nut 5B.

  The connecting means B includes a pair of strip-like connecting arms 7 formed integrally with the first holding member 3 of the both holding and fixing means A, and a connecting arm 8 constructed over the distal ends of the connecting arms 7. The connecting arm 8 includes a first divided connecting arm portion 8A that is fixedly connected to a distal end portion of one connecting arm 7 via a second fastening tool 9, and the other connecting arm. 7 includes a second split joint arm portion 8B fixedly connected to the tip end portion via a second fastening tool 9 so as to be rotatable, and the adjacent end portions of the split joint arm portions 8A and 8B are third fastened. The length adjusting means which is fixedly connected so as to be able to rotate through the tool 10 and adjusts the set holding interval L of the both holding and fixing means A by adjusting the rotation of the split joint arms 8A and 8B. D is configured.

  The second tightening tool 9 includes a bolt 9A inserted through a through hole 7a formed at the end of the connecting arm 7 and a through hole 8a formed at one end of the split connecting arm 8A, 8B, The wing nut 9B is screwed into the protruding screw shaft portion, and the third fastener 10 is also inserted through a through hole 8b formed in the adjacent end portions of the split connection arm portions 8A and 8B. Bolt 10A and a wing nut 10B screwed to the protruding screw shaft portion thereof.

  When two refrigerant-coated copper pipes 2 are joined by brazing at the construction site, the cylindrical heat insulating material 1 covered by each refrigerant-coated copper pipe 2 is compressed in the tube axis X direction. The end portions of the coolant-coated copper pipe 2 are exposed by a length corresponding to the joining work area, and the both holding members 3 and 4 constituting the holding and fixing means A are received by the exposed pipe end portions 2A. When the recesses 3A and 4A are applied and the bolts 5A and wing nuts 5B of the first tightening tool 5 are tightened, the connecting means B has a set clamping interval L and a set joining posture that is positioned in a straight line on the tube axis X. By the both holding and fixing means A connected, the exposed pipe end portions 2A of the both coated copper pipes 2 for refrigerant are fitted and connected to both ends of the pipe joint 6 in a straight line with a set fitting depth. At the same time restrained by the set joining posture, the receiving recesses of the both holding members 3, 4 Since the cylindrical heat insulating material 1 is maintained in a compressed state in which the compression operation is performed in the tube axis X direction by the receiving portions C configured by the end faces 3a, 4a on both sides in the tube axis X direction in A, 4A, It is possible to efficiently and reliably perform the joining operation of the two coated copper tubes 2 for refrigerant while facilitating handling.

  Further, each holding and fixing means A is provided with a receiving portion C that comes into contact with the end surface 1a of the tubular heat insulating material 1 compressed in the tube axis X direction from the tube axis X direction. Even if the tightening force of the second tightening tool 9 that fixes and connects the connecting arm 7 and the connecting arm 8 of B is insufficient or the tightening force of the second tightening tool 9 is loosened, the compression operation is performed. Since the elastic restoring force of the tubular heat insulating material 1 acts as an urging force for pushing the exposed pipe end 2A of the two coated copper pipes 2 against both ends of the pipe joint 6, The exposed pipe end 2A of the copper pipe 2 and the pipe joint 6 can be reliably joined at the set fitting depth.

  Further, after the joining operation of the both coated copper pipes 2 for both refrigerants, when the first fastener 5 is released and the respective holding and fixing means A are removed from the exposed pipe end portions 2A of the coated copper pipes 2 for both refrigerants, the compression is performed. Since the tubular heat insulating material 1 in the state is restored to the initial covering state by the elastic restoring force, it is only necessary to cover the exposed portion located between the adjacent end portions of the restored two tubular heat insulating materials 1, The coating treatment after the joining work can be advantageously performed in terms of cost and work efficiency.

FIG. 4 shows the case where the set clamping interval L of the both clamping and fixing means A is adjusted to the small side. It is bent and connected in a V-shape on the far side.
In the case where it does not interfere with the brazing operation, the split joint arm portions 8A and 8B of the joint arm 8 are bent in a V shape toward the side where the third fastener 10 is close to the pipe joint 6. It may be fixedly connected.

  FIG. 5 shows an example in which a copper 90-degree elbow is used as the pipe joint 6. By adjusting the crossing angle between the connecting arm 7 and the connecting arm 8 of the connecting means B to 45 degrees, the connecting means The exposed pipe ends 2A of the two coated copper tubes 2 for refrigerant are connected to the pipe joint 6 by the both clamping and fixing means A connected by B with the setting clamping interval L and the setting joining posture positioned on the orthogonal pipe axis X. It is constrained to an appropriate set joining posture that is fitted and connected at a right angle to the both ends with a set fitting depth.

  FIG. 6 shows a case where the set holding interval L of the both holding and fixing means A is changed to a small value, and the second divided connecting arm portion 8B is removed from both the divided connecting arm portions 8A and 8B of the connecting arm 8. The end portions of the pair of connecting arms 7 are fixedly connected to both end portions of the first split connecting arm portion 8A so as to be rotatable.

[Second Embodiment]
FIG. 7 shows another embodiment of the connecting means B. Among the two split connecting arm portions 8A and 8B of the connecting arm 8, the through hole 8b formed in the first split connecting arm portion 8A is connected to the longitudinal direction of the connecting arm 8. The two split connecting arm portions 8A and 8B are formed so as to be extendable along the longitudinal direction of the connecting arm 8.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) As the holding and fixing means A, from the pipe joining work area (brazing work area) of the pipe end 2A of the cladding pipe 2 exposed by the compression operation in the tube axis X direction of the cylindrical covering material 1 Any other holding and fixing structure such as a cam type or a clip type may be used as long as it can hold and fix a distant part so as to be detachable.

  (2) As the connecting means B, any connecting structure may be used as long as it can connect the both holding and fixing means A with the set holding interval L and the set joining posture.

  (3) The length adjusting means D provided on the connecting arm 8 may be configured to have any expansion / contraction adjusting structure as long as the set holding interval L of the both holding and fixing means A can be adjusted. .

(4) In the first embodiment described above, the holding and fixing means A is provided with the receiving portion C that comes into contact with the end face of the compressed cylindrical covering material 1. The receiving portion C is connected to the connecting means. B may be provided.
Even in this case, the tightening force of the second tightening tool 9 for fixing and connecting the connecting arm 7 and the connecting arm 8 of the connecting means B is insufficient or the tightening force of the second tightening tool 9 is loosened. Even if it exists, the elastic restoring force of the cylindrical heat insulating material 1 subjected to the compression operation causes the exposed pipe end 2A of both the coated copper tubes 2 for both refrigerants to the both ends of the pipe joint 6 via the connecting arm 7 of the connecting means B. On the other hand, since it acts as an urging force to the pushing side, the exposed pipe end 2A of both the coated copper pipes 2 for refrigerant and the pipe joint 6 can be reliably joined at the set fitting depth.

  (5) In the first embodiment described above, the first holding member 3 and the connecting arm of the holding and fixing means A are integrally formed. However, the first holding member 3 and the connecting arm 7 are fixed in a detachable state. You may connect.

The front view at the time of attachment which shows 1st Embodiment of the pipe fixing jig for pipe joining of this invention Sectional view during installation Exploded perspective view Front view when the set holding interval of both holding and fixing means is adjusted to the small side Front view when an elbow is used as a fitting Front view when the setting holding interval of both holding and fixing means is changed to a small one The front view at the time of attachment which shows 2nd Embodiment of the pipe fixing jig for pipe joining of this invention

Explanation of symbols

A Holding and fixing means B Connecting means C Receiving means D Length adjusting means L Setting holding interval X Tube axis 1 Tubular covering material (tubular heat insulating material)
1a End face 2 Clad tube (Covered copper tube for refrigerant)
2A Exposed Pipe End 3 First Holding Member 3A Receiving Recess 4 First Holding Member 4A Receiving Recess 5 Fastening Tool (First Fastening Tool)
7 connecting arm 8 connecting arm 8A split connecting arm (first split connecting arm)
8B Split joint arm (second split joint arm)

Claims (5)

  A gripping and fixing means for detachably gripping and fixing a tube end portion exposed by a compression operation in the tube axis direction of the cylindrical coating material, out of both cladding tubes covering the compressible cylindrical coating material; Connecting means for connecting both the holding and fixing means at a set holding interval and a set joining posture, and the holding and fixing means or the connecting means has a receiving portion that comes into contact with the end face of the compressed cylindrical covering material. A pipe fixing jig for pipe joining provided.   The said connection means is comprised from a pair of connection arm provided with the said holding | maintenance fixing means, and the connection arm which fixedly connected the other end part of the said connection arm in the state which can respectively be rotated. Pipe fixing jig for pipe joining.   3. The pipe fixing jig for pipe joining according to claim 2, wherein the connecting arm is provided with a length adjusting means capable of adjusting a set holding interval of the both holding and fixing means.   The pipe fixing jig for pipe joining according to claim 3, wherein the length adjusting means is configured to fix and connect a plurality of split connecting arm portions of the connecting arm in a rotatable state. The both holding and fixing means includes a first holding member having a recess for receiving one side surface of the exposed tube end portion of the cladding tube, and a second holding member having a recess for receiving the other side surface of the exposed tube end portion of the cladding tube. The pipe fixing jig for pipe joining according to any one of claims 1 to 4, comprising a member and a fastening tool that relatively moves both holding members toward the fastening side.

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