JP2011038604A - Heat insulating hose and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation hose of an intended length having connection port parts at both ends easily and surely by unwinding a long rolled heat insulation hose at a work site. <P>SOLUTION: In the heat insulation hose, a long synthetic resin pipe 10 is formed by connecting a plurality of short synthetic resin pipes 11 which are about 50 cm-1 m long provided with a large diameter connection port part 12 at an end and a small diameter connection port 13 at the other end by sequentially inserting and fitting the small diameter connection port part 13 to the large diameter port part 12 in a manner capable of being pulled out, and this long synthetic resin pipe 10 is coated by a foaming synthetic resin heat insulating coating material 20. A foaming synthetic resin heat insulating coating material part coating a connection part of the large connection port part 12 and the small diameter connection port part 13 in a part of a predetermined length from one end is divided from a cutting line 21 arranged at the part and thus the heat insulating hose in the intended length can be provided by separating the large connection port part 12 and the small diameter connection port part 13 at the part from each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a long heat insulating hose in which a connection port portion is provided for each predetermined length and a method for manufacturing the same.

  Conventionally, for example, in order to extract the drain discharged from the drain outlet of an air conditioner to the outside, a short drain hose covered with a heat insulating material is connected to the drain outlet, and the short drain hose is insulated. Piping is performed so that drainage is discharged to the outside through this insulated hose connected to the hose, but the construction length of the insulated hose varies depending on the installation location of the air conditioner, the structure of the building, etc. A long heat insulation hose having a length of 10 m or more is prepared in advance.

  However, in order to connect this heat insulating hose to the drain hose, not only a pipe joint that connects between the opposite open ends of these hoses is required, but also through the drainage hose from this heat insulating hose to a suitable outdoor location. Even when discharging the drain, a pipe joint for connecting the drainage hose to the opening end of the heat insulating hose is required, and the construction work becomes complicated, the work efficiency is lowered, and there is a possibility that poor adhesion may occur. There is a problem.

  For this reason, as described in Patent Document 1, the inventors of the present application coat a long corrugated tube that forms a mouth portion, which is a connection port, with a heat insulating pipe for every fixed length of about 50 cm. In addition, the present inventors have devised a heat-insulating hose in which a cutting line such as a perforation is provided in a portion of the heat-insulating pipe that covers each of the mouth portions.

Japanese Utility Model Publication No. 5-15678

  According to the heat insulating hose configured in this way, the mouth portion serving as a connection port for other pipes, drainage ports, etc. is provided at intervals of about 50 cm, so the length from the mouth portion according to the construction length However, at the time of construction, the mouth part must be cut with a knife or the like at the work site, which is troublesome and cannot be cut accurately. In addition, there is a problem that it may be difficult to connect with high accuracy.

  The present invention has been made in view of such problems, and the object of the present invention is to provide connection ports at both ends at a construction site, and easily and accurately to a length dimension corresponding to the construction length. It is another object of the present invention to provide a heat-insulating hose and a method for manufacturing the same, which can be divided into two, and can be efficiently and accurately connected to other pipes.

  In order to achieve the above object, the heat insulating hose of the present invention has a small diameter that can be inserted into the large diameter connection port at one end and the large diameter connection port at the other end as described in claim 1. By inserting a large number of flexible short synthetic resin pipes having a length of several tens of centimeters to 1 m, and sequentially connecting the small-diameter connection ports into the large-diameter connection ports so that they can be extracted. A long synthetic resin tube formed by connecting is formed, and this long synthetic resin tube is covered with a tubular foamed synthetic resin heat insulating coating material over the entire length, and adjacent short synthetic resin tubes are connected to each other. It is set as the structure which provides a cutting line in the heat insulation coating material part made from a synthetic foam resin which has coat | covered the fitting part of the connected large and small diameter connection port part.

  In the heat insulating hose thus configured, the short synthetic resin pipe is a corrugated pipe as described in claim 2.

  The invention according to claim 3 is the method for manufacturing the heat insulating hose, wherein each of the short pipe portions having a length of several tens of cm to 1 m has a large diameter connection port portion and a small diameter that can be inserted into the large diameter connection port portion. A flexible synthetic resin tube having a mouth portion formed by connecting a connection port portion is manufactured, and the large-diameter connection port portion and the small-diameter connection port portion of the mouth portion of the flexible synthetic resin tube are continuously provided. By sequentially cutting the portion, the large-diameter connection port portion is divided into a large number of short synthetic resin pipes provided with a small-diameter connection port portion at one end and a small-diameter connection port portion at the other end. By inserting the small-diameter connection port portion into the diameter connection port portion so as to be removable, a long synthetic resin tube in which a large number of short synthetic resin tubes are connected in series is produced. A cutting line is provided at the part covering the mouth part composed of the large and small diameter connection mouth parts connecting adjacent short synthetic resin pipes. It is characterized by coating a synthetic resin insulation coating material.

  In the method of manufacturing a heat insulating hose configured as described above, the long synthetic resin pipe is a corrugated pipe as described in claim 4, and the foamed synthetic resin heat insulating covering material is claimed as As described in item 5, the belt-shaped foamed synthetic resin thermal insulation coating material is formed of a strip-shaped foamed synthetic resin thermal insulation coating material having a constant thickness and a width equal to the circumference of the outer diameter of the flexible synthetic resin tube. Is formed into a tubular shape so that both side end surfaces thereof are joined to each other, thereby covering a long synthetic resin tube and bonding both side end surfaces joined to each other.

  According to the invention which concerns on Claim 1, the length which provides the large diameter connection port part in one end part and the small diameter connection port part which can be inserted in this large diameter connection port part in the other end part is several tens cm- A long synthetic resin pipe is formed by connecting a large number of short synthetic resin pipes having a flexibility of 1 m by sequentially inserting a small-diameter connection opening into a large-diameter connection opening. In addition, the tubular foamed synthetic resin thermal insulation coating material covering the long synthetic resin pipe has a short synthetic resin pipe adjacent to the multiple short synthetic resin pipes forming the long synthetic resin pipe. Since the cutting line is provided in the part covering the fitting part of the large and small diameter connection port part that connects each other, cut the insulation cover material part made of foamed synthetic resin located in the length dimension according to the construction length After cutting from the wire, the foamed synthetic resin insulation sheath that is adjacent in the length direction through the cutting line By pulling the material parts in a direction separating them from each other, it is possible to easily separate the large and small diameter connection ports between adjacent short synthetic resin pipes covered with the heat insulating coating material part made of foamed synthetic resin. To improve the efficiency of piping work by providing large diameter and small diameter connection ports at both ends without requiring any skill and easily obtaining a heat insulation hose with a length corresponding to the construction length. It is possible to perform construction with high accuracy.

  Further, according to the invention according to claim 2, since the short synthetic resin pipe is formed from the corrugated pipe, it is excellent in flexibility, and the short synthetic resin pipe and the foamed synthetic resin heat insulating covering material are By forming from an olefin-based resin, it has excellent heat insulation properties, and it is rich in flexibility and elasticity, so that workability can be improved. In addition, it has a relatively high tensile strength. There is no fear that the foamed synthetic resin thermal insulation coating material will extend almost even if it is pulled. Therefore, in this foamed synthetic resin thermal insulation coating material, a large and small diameter connection port connecting adjacent short synthetic resin pipes. It is possible to provide a heat insulating hose having a desired length that can reliably prevent the parts from separating from each other and can smoothly pass water through the connecting port portions having large and small diameters fitted to each other. .

  In addition, as described in claim 3, the method for manufacturing the heat insulating hose is first inserted into the large-diameter connection port portion and the large-diameter connection port portion for each short pipe portion having a length of several tens of cm to 1 m. Manufacturing a flexible synthetic resin tube provided with a mouth portion formed by connecting a possible small diameter connection port portion, and a large diameter connection port portion and a small diameter connection port portion of each mouth portion in the flexible synthetic resin tube Is cut into a large number of short synthetic resin tubes with a large-diameter connection port at one end and a small-diameter connection port at the other end. A large number of high-precision short synthetic resin pipes that can be accurately and automatically cut efficiently and have a large-diameter connection port at one end and a small-diameter connection port at the other end are easily obtained. Then, these short synthetic resin pipes are sequentially inserted into the large diameter connection port portion so that the small diameter connection port portion can be removed. Since the in is, the connected number present short synthetic resin tube into a series, and can be obtained easily dividable elongated synthetic resin tube from the desired lengths.

  After that, this long synthetic resin pipe is made of a synthetic foam having a cutting line at the portion covering the fitting portion of the large and small diameter connection port portions that are connected to each other and are connected to each other. Since it is covered with a heat-insulating coating material, after cutting the foamed synthetic resin heat-insulating coating material part from the cutting line at the desired location, the short synthetic resin pipes located at this cutting part are connected to each other with large and small diameter connections A long heat insulating hose capable of obtaining a heat insulating hose having a desired length can be manufactured only by performing an operation of separating the connection of the mouth portion by a pulling force.

  According to the invention of claim 4, since the flexible synthetic resin pipe is a synthetic resin corrugated pipe made of an olefin resin or the like, it has excellent flexibility and can withstand long-term use. While the hose can be manufactured, the foamed synthetic resin thermal insulation covering material is a strip-shaped olefin-based material having a constant thickness and a width equal to the circumference of the outer diameter of the flexible synthetic resin pipe as described in claim 5 It consists of a foamed synthetic resin thermal insulation coating material such as foamed resin, and covers the long synthetic resin pipes by bending the strip-shaped foamed resin thermal insulation material into a tubular shape so that both end faces are joined together. Since both end faces are bonded, a long flexible synthetic resin tube can be easily and reliably covered with a heat insulating coating material made of foamed synthetic resin, and a heat insulating hose having a desired length can be efficiently manufactured. That.

The side view which carried out the cross section of a part which shows a part of this invention heat insulation hose. The longitudinal section side view of the connection part of the short synthetic resin pipes mutually connected. The longitudinal front view. The simplified side view which sectioned a part of the state divided | segmented into the heat insulation hose of desired length. The expanded sectional view of the division part. The longitudinal side view which abbreviate | omitted one part which shows the one use state connected to the drain hose. The simplified side view which shows the state which divides a long synthetic resin pipe | tube from a connection port part. The simplified side view of the cut short synthetic resin pipe. The simplified side view which shows the state which connects a short synthetic resin pipe | tube sequentially. The simplified side view which shows the state connected. The simplified side view which shows the state which has coat | covered the elongate synthetic resin pipe | tube with the foaming synthetic resin heat insulation coating material.

  Next, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, the heat insulating hose A has a plurality of short synthetic resin tubes 11 having a length of several tens of cm to 1 m, 11 ... 11 is formed by sequentially covering one long synthetic resin tube 10 formed by connecting separably with a tubular synthetic heat insulating covering material 20 made of foamed synthetic resin. . Specifically, the short synthetic resin tube 11 is composed of a flexible synthetic resin corrugated tube having a length of 50 cm to 1 m, and has one end opening formed in the large-diameter connection port portion 12. The other end opening is formed in the small-diameter connection port portion 13 that can be water-tightly inserted into the large-diameter connection port portion 12. Then, a plurality of short synthetic resin pipes 11 configured in this way are sequentially arranged so that the small diameter connection port part 13 of the other short synthetic resin pipe 11 can be extracted from the large diameter connection port part 12 of one short synthetic resin pipe 11 in sequence. The tube is formed into a long synthetic resin tube 10 having a length of several tens to several tens of meters by being inserted, and the long synthetic resin tube 10 is formed of a tubular foamed synthetic resin thermal insulation coating having a certain thickness. A section line 21 formed by perforation or printing on the portion of the heat-insulating covering material 20 made of foamed synthetic resin that is covered with the material 20 and covers the fitting portions of the large and small diameter connecting port portions 12 and 13 connected to each other. Is provided over the entire circumference.

  The corrugated pipe made of synthetic resin used as the short synthetic resin pipe 11 is made of an olefin resin such as polyethylene or polypropylene, and similarly, the foamed synthetic resin thermal insulation covering material 20 is also made of an olefin foam resin. However, it may be made of other synthetic resins. Further, the outer diameter of the short-tube-shaped large-diameter connection port 12 formed at one end opening of the short synthetic resin tube 11 is formed substantially equal to the outer diameter of the short synthetic resin tube 11, and the short length The outer diameter of the short-diameter connecting port portion 13 formed in the other end opening of the synthetic resin tube 11 is formed to a diameter that can be fitted in a watertight manner to the inner diameter of the large-diameter connecting port portion 12. Yes.

  Further, as shown in FIG. 2, a ring-shaped protrusion having a fixed height projecting from the outer peripheral surface of the small-diameter connection port portion 13 is formed at the base end portion in the length direction of the small-diameter connection port portion 13 in the short synthetic resin pipe 11. The strip 14 is formed over the entire circumference, and the two short synthetic resin pipes 11 and 11 are connected to the large diameter connection port 12 of the one short synthetic resin pipe 11 with the other short synthetic resin pipe 11. When connecting by inserting the small-diameter connection port portion 13, the tip surface of the large-diameter connection port portion 12 was fitted on the outer peripheral surface of the base end portion of the ring-shaped protrusion portion 14. By abutting through the annular seal material 15, so as to prevent further fitting and confirm that these large and small diameter connection ports 12, 13 are completely connected, and The seal member 15 is configured to be connected in a sealed state. Note that the cutting line 21 provided in the heat insulating covering material portion made of foamed synthetic resin covering each fitting portion of the large and small diameter connection port portions 12 and 13 in the short synthetic resin pipes 11 and 11 connected to each other, It is located at the open end of the large-diameter connection port portion 12 in contact with the ring-shaped protrusion 14.

  In addition, a circumferential groove 16 bulging from the inner peripheral surface toward the outer peripheral surface is formed at the intermediate portion in the length direction of the large diameter connection port portion 12 fitted to the small diameter connection port portion 13, A relatively low (approximately 1 mm) protrusion 17 projecting in the circumferential direction at an intermediate portion in the length direction of the small diameter connection port portion 13 is engaged with the groove 16 so as to be detachable. The opening end of the large-diameter connection port 12 is expanded in a trumpet shape 12a toward the opening end, while the outer peripheral surface of the opening end of the small-diameter connection port 13 is slightly reduced in diameter toward the tip. When the long synthetic resin tube 10 is manufactured by forming the tapered port portion 13a inclined in the direction to be connected, the large-diameter connection port portion 12 and the small-diameter connection port portion 13 can be easily and accurately fitted. is doing.

  The long heat insulating hose A configured as described above is wound and drawn out at a construction site to obtain a heat insulating hose having a desired length (hereinafter referred to as a fixed heat insulating hose A1). Specifically, first of all, a cut synthetic wire 21 made of foamed synthetic resin having a length corresponding to the construction length from the distal end (free end) of the long heat insulation hose A is provided at the cutting line 21. Divide from For example, the cutting length 21 is provided at intervals of 50 cm on a foamed synthetic resin thermal insulation covering material 20 having a construction length of 4 m and covering the long synthetic resin tube 10 of the long thermal insulation hose A. Then, the foamed synthetic resin heat insulating covering material portion having the eighth cutting line 21 from the free end of the long heat insulating hose A is cut off from the cutting line 21. In addition, if the cutting line is formed by perforations that penetrate between the inner and outer peripheral surfaces of the foamed synthetic resin heat insulating coating material 20, it can be accurately divided without using a cutter or the like.

  After that, when the split portions of the foamed synthetic resin thermal insulation covering material 20 facing each other through the cutting line 21 are gripped by both hands and pulled away from each other, as shown in FIGS. In the large and small diameter connection ports 12 and 13 of the short synthetic resin pipes 11 and 11 connected to each other provided at the position 21, the small diameter connection port portion 13 is pulled out from the large diameter connection port portion 12 and these large and small connection ports 12 , 13 is released, and a standard heat insulating hose A1 can be obtained.

  In addition, each cutting line 21 is a foamed synthetic resin thermal insulation covering material portion on the open end of the large-diameter connection port portion 12 in contact with the ring-shaped projecting portion 14 protruding from the outer peripheral surface of the small-diameter connection port portion 13 Therefore, when the foamed synthetic resin thermal insulation covering material 20 is divided from the connection line 21, the large-diameter connection port 12 present on one end side of the above-mentioned fixed-length thermal insulation hose A1 is expanded to the opening end of the synthetic foam resin. While being covered with the covering material 20, the small-diameter connection opening 13 remaining on the winding side is in a state of protruding from the opening end (cutting opening) of the heat insulating covering material 20 made of foamed synthetic resin.

  For example, as shown in FIG. 6, in order to construct the fixed heat insulating hose A1 as a drain discharge pipe of the drain pan 30 of the air conditioner, a short drain hose having one end connected to the drain outlet 31 of the drain pan 30. Connect to the other end of B. At this time, one end of the drain hose B is provided with a large-diameter connection port portion b1 that is fitted in the drain discharge port 31 and connected in a watertight manner, and the other end is provided with a small-diameter connection port portion b2. The drain ho B is covered with a heat insulating covering material C made of a foamed synthetic resin in the same manner as the heat insulating hose A on the outer peripheral surface from the opening end of the large diameter connecting port portion b1 to the base end portion of the small diameter connecting port portion b2. The small-diameter connection opening b2 protrudes from the foamed synthetic resin thermal insulation covering material C.

  On the other hand, the inner diameter of the large-diameter connection port 12 in the large and small-diameter connection ports 12 and 13 connecting the short synthetic resin pipes 11 and 11 in the heat insulating hose A is outside the small-diameter connection port b2 of the drain hose B. The large-diameter connection port portion 12 is configured to fit the small-diameter connection port portion b2 in a water-tight manner so that the large-diameter connection port portion 12 of the drain hose B is connected to the small-diameter connection hose A1. The construction is carried out by fitting in the small diameter connection port b2 and making a close contact through the sealing material 15 '. At this time, since the large-diameter connection port portion 12 of the standard heat-insulating hose A1 is covered with the heat insulating coating material 20 made of the synthetic foam resin, the large-diameter connection port portion 12 is covered with the small-diameter connection port portion b2 of the drain hose B. When fitted, the small-diameter connection port b2 is not covered with the foamed synthetic resin thermal insulation coating material C, and therefore, the foamed synthetic resin thermal insulation coating covers the large-diameter connection port 12 of the standard heat insulation hose A1. The end face of the material 20 can be joined in close contact with the opposing end face of the foamed synthetic resin heat insulating covering material C of the drain hose B so that the heat insulating covering material can be continued in the length direction.

  The small-diameter connection port 13 provided on the other end side of the fixed heat insulating hose A1 constructed in this way protrudes outside from the end of the heat-insulating covering material 20 made of synthetic foam resin. By connecting a large-diameter connection port of a hose (not shown) piped outdoors to 13, the drain can be drained outdoors. Note that the fixed heat insulating hose A1 may be directly connected to the drain discharge port 31 of the drain pan 30 without connecting the fixed heat insulating hose A1 to the drain discharge port 31 of the drain pan 30 via the short drain hose B. Good.

  Next, the manufacturing method of the heat insulating hose A configured as described above will be described. First, for each corrugated pipe portion 10a having a short constant length of several tens of cm to 1 m by a known corrugated pipe manufacturing apparatus (not shown). A flexible synthetic resin tube 10 ′ made of an olefin-based resin provided with a mouth portion 10b formed by connecting a large-diameter connection port portion 12 and a small-diameter connection port portion 13 that can be inserted into the large-diameter connection port portion 12 The continuous portion of the large diameter connection port portion 12 and the small diameter connection port portion 13 of the base portion 10b in the flexible synthetic resin tube 10 ′ is sequentially formed by a cutter 30 as shown in FIG. By cutting, a large number of short synthetic resin tubes 11 having a large-diameter connection port 12 at one end and a small-diameter connection port 13 at the other end are obtained as shown in FIG.

  At this time, the flexible synthetic resin tube 10 ′ continuously manufactured by the corrugated tube manufacturing apparatus is connected to the large diameter connection port 12 and the small diameter by the cutter 30 disposed on the downstream side of the corrugated tube manufacturing apparatus as described above. A plurality of short synthetic resin pipes 11 may be manufactured by sequentially cutting the connecting portion with the connection port 13 or a flexible composite of tens to several tens of meters by a corrugated pipe manufacturing apparatus. After producing the resin tube 10 ′, the flexible synthetic resin tube 10 ′ is cut by the cutter 30 in order to sequentially cut and divide the connecting portion of the large diameter connection port portion 12 and the small diameter connection port portion 13, A large number of short synthetic resin tubes 11 may be manufactured.

  As shown in FIG. 7, the connecting portions of the large-diameter connection port portion 12 and the small-diameter connection port portion 13 have both side portions in the length direction facing the large-diameter connection port portion 12 and the small-diameter connection port portion 13. It is formed in the flange portion 18 having a V-shaped cross section formed in the inclined wall portions 18a and 18b inclined in the diameter reducing direction, and the small diameter connection port portion 13 and the inclined wall portion 18b of the flange portion 18 are connected to each other. The part is formed in a circumferential groove 19 having a V-shaped cross section recessed in the reduced diameter direction, and the top part of the flange 18 and the groove bottom part of the circumferential groove 19 are cut by the cutters 30 and 30. Then, by cutting off the part from the groove bottom of the circumferential groove 19 to the top of the other inclined wall portion 18b of the flange portion 18, the opening end of the large-diameter connection port portion 12 is formed by one inclined wall portion 8a of the flange portion 18. A short synthetic resin tube 11 is obtained in which the trumpet-shaped widened portion 12a is formed in the portion, while the opening end portion of the small diameter connecting port portion 13 is formed in the tapered mouth portion 13a.

  Then, as shown in FIG. 9 and FIG. 10, these short synthetic resin pipes 11, 11... 11 are sequentially connected to the large diameter connection port portion 12 of one short synthetic resin pipe 11 with the other short synthetic resin pipe. By inserting 11 small-diameter connection ports 13 so that they can be pulled out, a large number of short synthetic resin tubes 11 connected in series in the length direction have a length of several tens to several tens of meters. A resin tube 10 is produced. At this time, the sealing material 15 is attached to the base end portion of the small-diameter connection port portion 13 of each short synthetic resin tube 11 in a state of being received by the ring-shaped protrusion 14.

  Thereafter, the long synthetic resin tube 10 is fed into a heat insulating material coating apparatus, and the outer peripheral surface thereof is covered with the heat insulating covering material 20 made of a synthetic foam resin over the entire length. Specifically, as shown in FIG. 11, the heat insulating material coating apparatus includes a tubular molded portion 41 having a constant length having an inner diameter equal to the outer diameter of the heat insulating hose A to be manufactured, and one end of the tubular forming portion 41. A trumpet-shaped expanded coating forming portion 42 connected to the opening, and the coating forming portion 42 has a constant thickness and a width equal to the outer circumference of the flexible synthetic resin tube 10 '. When the long synthetic resin pipe 10 is placed along the belt-like heat insulation coating material 20 ′ along with the belt-like heat insulation coating material 20 ′, the belt-like heat insulation coating material 20 ′ is gradually reduced in diameter. The long synthetic resin tube 10 is encapsulated while being bent into a tubular shape by the inner peripheral surface of the coating forming portion 42, and is introduced into the tubular forming portion 41 so that the long synthetic resin tube 10 is formed into a tubular foamed synthetic resin heat insulating coating material The heat insulating hose A covered with 20 is manufactured.

  At the time of manufacturing the heat insulating hose A, the belt-shaped heat insulating covering material 20 ′ is composed of large and small diameter connecting ports 12, 13 connecting the short synthetic resin tubes 11, 11 adjacent to each other in the long synthetic resin tube 10. A portion covering the mouth portion 10b, specifically, a portion covering the opening end (tip) of the large-diameter connection port portion 12 is formed with perforations or printed cutting lines 21 on both sides at a certain length. It is provided between the end faces. Further, when the long synthetic resin pipe 10 is covered with the heat insulating covering material 20 ′, before being introduced into the tubular forming portion 41 by being bent into a tubular shape by the covering forming portion 42, or Immediately after the passage, the heat insulating hose A is continuously manufactured while heat-sealing (thermal welding) the joint portions on both side end surfaces that are joined to each other.

A Insulation hose
10 Long synthetic resin pipe
11 Short synthetic resin pipe
12 Large diameter connection port
13 Small diameter connection port
20 Thermal insulation coating material made of foamed synthetic resin
21 Cutting line

Claims (5)

  A short synthetic resin having a length of several tens of centimeters to 1 m with a large-diameter connection port at one end and a small-diameter connection port that can be inserted into the large-diameter connection port at the other end. A long synthetic resin tube is formed by connecting a large number of pipes in succession by inserting the small diameter connection port into the large diameter connection port so that the small diameter connection port can be removed. Covered with a tubular foamed synthetic resin heat insulating coating material, and covered with a synthetic resin heat insulating coating material covering the fitting portion of the large and small diameter connection port connecting adjacent short synthetic resin tubes A heat insulating hose characterized by comprising a cutting line.   The heat insulating hose according to claim 1, wherein the short synthetic resin pipe is a corrugated pipe.   Flexibility provided with a mouth portion formed by connecting a large diameter connection port portion and a small diameter connection port portion that can be inserted into the large diameter connection port portion for each short pipe portion having a length of several tens of cm to 1 m. A synthetic resin pipe is manufactured, and a large-diameter connection port portion is connected to one end portion by sequentially cutting the connecting portion of the large-diameter connection port portion and the small-diameter connection port portion of the base portion in the flexible synthetic resin tube. After dividing into a large number of short synthetic resin pipes with small diameter connection ports at the ends, these short synthetic resin tubes are sequentially inserted into the large diameter connection ports so that the small diameter connection ports can be removed. A long synthetic resin tube is formed by connecting a large number of short synthetic resin tubes in series, and this long synthetic resin tube is composed of a large and small diameter connection port portion connecting adjacent short synthetic resin tubes. A section characterized by covering with a heat insulating coating material made of foamed synthetic resin in which a cutting line is provided at a portion covering the mouth portion Method of manufacturing a hose.   The method for manufacturing a heat insulating hose according to claim 3, wherein the flexible synthetic resin pipe is a corrugated pipe.   The foamed synthetic resin thermal insulation coating is composed of a strip-shaped foamed synthetic resin thermal insulation coating having a constant thickness and a width equal to the circumference of the outer diameter of the flexible synthetic resin tube. The heat insulation according to claim 3 or 4, wherein the material is bent into a tubular shape so that both end faces thereof are joined to each other, thereby covering the long synthetic resin pipe and bonding the both end faces joined to each other. Hose manufacturing method.

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