JP2018004052A - Joint structure of pipe cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of a pipe cover where failure such as dew formation or poor appearance is hard to occur even in a case where deviation due to heat shrinkage occurs between adjacent pipe covers.SOLUTION: In a pipe 1, a joint structure 2 of a pipe cover 20 includes an inside pipe 10, and a plurality of pipe covers 20 arranged on an outer periphery of the inside pipe 10 and connected in a lengthwise direction of the inside pipe 10. A joint member 30 is attached to an end part 24 of a first pipe cover 20a among the pipe covers 20. Inside the joint member 30, a second pipe cover 20b adjacent to the first pipe cover 20a is fitted so as to relatively move along the lengthwise direction of the inside pipe 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a joint structure for a piping cover.

  For example, as a refrigerant pipe of an air conditioner, one having a configuration in which a heat insulating cover (pipe cover) is coated on the outside of a pipe (inner pipe) through which the refrigerant flows is known (see Patent Document 1).

Japanese Patent Laying-Open No. 2015-117792

  In such a pipe, for example, a method for realizing a pipe cover covering the entire length of the inner pipe by adding a plurality of pipe covers in the length direction of the inner pipe to the inner pipe extending continuously, for example. Is often adopted. However, when the pipe cover is made of resin, thermal contraction is likely to occur due to the influence of a refrigerant or the like flowing through the inner pipe, and if the clearance causes a gap in the added portion (between adjacent pipe covers). The inner piping may be exposed, causing problems such as condensation or poor appearance.

  The present invention has been completed based on the above circumstances, and even if there is a displacement due to heat shrinkage between adjacent pipe covers, problems such as the occurrence of condensation and poor appearance occur. The object is to provide a piping cover joint structure that is difficult to use.

  In order to solve the above-described problems, a pipe cover joint structure according to the present invention includes an inner pipe and a plurality of pipe covers arranged on the outer periphery of the inner pipe and extended in the length direction of the inner pipe. In the pipe provided, a joint member is attached to an end of the first pipe cover of the pipe cover, and a second pipe cover adjacent to the first pipe cover is located on the inner side of the joint member. It is characterized by being fitted so as to be relatively movable along the direction.

  According to such a joint structure, even if there is a displacement (displacement that is spaced apart from each other in the tube axis direction) between the first pipe cover and the second pipe cover due to thermal shrinkage or the like, 2 Since the piping cover and the joint member relatively move along the length direction of the piping, it is possible to eliminate the displacement at least by the length of the second piping cover fitted inside the joint member. That is, when the second piping cover fitted inside the joint member comes out of the joint member due to relative movement, a gap (gap between the first piping cover and the second piping cover) that may be generated due to a shift is generated. On the other hand, the part of the second piping cover that has come out can be covered. As a result, the inner piping is exposed due to the displacement of the piping cover, causing dew condensation, and the occurrence of defects such as an appearance failure due to the exposure becomes difficult.

The said joint structure WHEREIN: The said joint member is made into the cylinder shape, It can comprise from what combined the half part of the shape cut | disconnected in the cylinder axial direction.
According to such a structure, it becomes possible to attach a coupling member suitably between the 1st piping cover and the 2nd piping cover which were distribute | arranged to the outer periphery of inner side piping. That is, it becomes possible to retrofit the joint member between the first pipe cover and the second pipe cover by covering the inner pipe or the second pipe cover with the respective halves.

The second pipe cover includes a cover main body and a connection member attached to an end of the cover main body, and the connection member is disposed inside the joint member along the length direction of the inner pipe. It can be fitted so as to be relatively movable.
According to such a configuration, the connecting member attached to the end portion of the cover main body bears the joint structure, that is, even when a displacement occurs between the first piping cover and the second piping cover, Since the member and the joint member relatively move along the length direction of the pipe, it is possible to eliminate the displacement by the length of at least the connecting member fitted inside the joint member. As a result, the inner pipe is exposed due to the displacement of the pipe cover, and the occurrence of dew condensation and the occurrence of defects such as an appearance defect due to the exposure are less likely to occur.

Further, the connecting member can be constituted by combining halves cut in the tube axis direction.
According to such a structure, it becomes possible to attach a connection member suitably between the 1st piping cover and the cover main body which were distribute | arranged to the outer periphery of inner side piping. That is, it is possible to retrofit the joint member between the first pipe cover and the cover body by covering each half so as to sandwich at least the inner pipe.

  According to the present invention, it is possible to provide a joint structure for a pipe cover that is less likely to cause problems such as the occurrence of condensation and poor appearance even when there is a deviation due to thermal shrinkage between adjacent pipe covers. Become.

The perspective view which shows piping provided with the joint structure of the piping cover which concerns on Embodiment 1. FIG. The perspective view which shows the effect | action in piping of FIG. Sectional drawing along the axial direction of piping in the state of FIG. Sectional drawing along the axial direction of piping in the state of FIG. The perspective view which shows the effect | action of a joint part in piping of FIG. FIG. 2 is a cross-sectional view illustrating a state before a joint portion is covered with a copper pipe in the pipe of FIG. 1, and a cross-sectional view in a direction intersecting with an axial direction of the pipe. Sectional drawing along the axial direction of piping provided with the joint structure of the piping cover which concerns on Embodiment 2. FIG. Sectional drawing which shows the effect | action in piping of FIG. Sectional drawing along the axial direction of piping provided with the joint structure of the piping cover which concerns on Embodiment 3. FIG. Sectional drawing which shows the effect | action in piping of FIG. Sectional drawing along the axial direction of piping provided with the joint structure of the piping cover which concerns on Embodiment 4. FIG. Sectional drawing which shows the effect | action in piping of FIG.

<Embodiment 1>
A first embodiment having a configuration according to the present invention will be described with reference to FIGS.
As shown in FIG.1 and FIG.3, the piping 1 which concerns on this embodiment is for transferring the refrigerant | coolant (for example, hydrofluorocarbon etc.) used for an air conditioner (air conditioner) between an indoor unit and an outdoor unit, for example. It is piping, Comprising: It is set as the structure mainly provided with the inner side piping 10 in which a refrigerant | coolant distribute | circulates directly through the inside, and the piping cover 20 which was distribute | arranged to the outer periphery of the inner side piping 10, and was provided with the heat retention function.

  The inner pipe 10 uses a highly durable copper pipe or the like because the refrigerant flows directly through the inner pipe 10. On the other hand, the piping cover 20 is made of a highly heat-retaining resin, particularly a foamed resin, so as to thermally protect the inner piping 10 having high thermal conductivity, and the heat of the refrigerant moves to the outside. This prevents or suppresses the occurrence of condensation on the surface of the pipe. Further, the piping cover 20 is formed by joining a plurality of piping covers in the length direction of the inner piping 10, and the adjacent piping covers 20 a and 20 b are joined by the joint structure 2 including the joint member 30.

  A joint member 30 is attached to the end 24 of the first pipe cover 20 a of the pipe cover 20 via a sealing material 50. In the joint member 30, the first base end 31 on the side in contact with the end 24 of the first pipe cover 20a has substantially the same cylindrical shape as the first pipe cover 20a, and the inner pipe is the same as the first pipe cover 20a. 10 has an inner diameter capable of covering 10 and has substantially the same thickness as the first pipe cover 20a, that is, has an outer diameter substantially the same as that of the first pipe cover 20a. In the joint member 30, the first connection portion 32 extending from the first base end portion 31 toward the second pipe cover 20 b side has the same outer diameter as the first base end portion 31, while the inner diameter is the first base end. The inner diameter is larger than that of the end portion 31, and as a result, a gap is formed between the first connection portion 32 of the joint member 30 and the inner pipe 10.

  On the other hand, the 2nd piping cover 20b among the piping covers 20 is provided with the cover main body 21 and the connection member 40 attached to the edge part 26 of the cover main body 21 via the sealing material 51. The connecting member 40 has a second base end portion 41 on the side in contact with the end portion 26 of the cover main body 21, which has substantially the same cylindrical shape as the cover main body 21. And has substantially the same thickness as the cover body 21, that is, has the same outer diameter as that of the cover body 21. Further, in the connection member 40, the second connection portion 42 extending from the second base end portion 41 to the first pipe cover 20a side has the same inner diameter as the second base end portion 41, while the outer diameter is the second base end. The outer diameter is smaller than the end portion 41, and specifically, the outer diameter is smaller than the inner diameter of the first connection portion 32 of the joint member 30. That is, as shown in FIG. 3, the second connection portion 42 of the connection member 40 covers the outer periphery of the inner pipe 10 and is fitted inside the first connection portion 32 of the joint member 30 (that is, inserted into the cylinder). In this case, the total length (length in the tube axis direction) of the second connection portion 42 is the same as the total length (length in the tube axis direction) of the first connection portion 32, or the total length of the first connection portion 32. Shorter than that. A slight clearance 16 is formed between the second connection portion 42 of the connection member 40 and the first connection portion 32 of the joint member 30.

  With such a configuration, in the second piping cover 20b adjacent to the first piping cover 20a, the connecting member 40 constituting the second piping cover 20b can be relatively moved along the length direction of the inner piping 10, It will be fitted inside the joint member 30 (FIGS. 1 and 3). In addition, the joint member 30 and the connection member 40 are each cylindrical, and as shown in FIGS. 5 and 6, the joint member 30 and the connection member 40 are formed by combining halves cut in the cylinder axis direction. The connecting member 40 is formed by combining the halves so as to cover the inner pipe 10, and the divided portions 14 are bonded with an adhesive or the like as necessary. In addition, the joint member 30 is combined so that each halved body is covered with the second connection portion 42 of the connection member 40 in a state where the clearance 16 is provided. It is made to adhere by.

  Here, a method of covering or coupling the pipe cover 20 to the inner pipe 10 will be described. After the inner pipe 10 is disposed at a predetermined position, the outer circumference of the inner pipe 10 is covered with the first pipe cover 20a and the cover main body 21. Here, the first piping cover 20a and the cover main body 21 are spaced apart from each other by a predetermined interval, specifically, the entire length of the joint member 30 (the length in the tube axis direction) and the second base end portion of the connection member 40. Covering is performed with a gap approximately equal to the value obtained by adding the length of 41 (the length in the tube axis direction). The inner pipe 10 is exposed in this gap.

  Thereafter, the halves of the connecting member 40 are combined so as to cover the inner pipe 10 exposed in the gap, and the end surface of the second base end portion 41 is arranged so as to contact the end surface of the end portion 26 of the cover body 21. Then, the connecting member 40 and the cover main body 21 are combined with the sealing material 51 to form the second piping cover 20b. Here, a fitting gap is formed between the connecting member 40 (specifically, the second connecting portion 42) of the first piping cover 20a and the second piping cover 20b, and the inner pipe 10 is formed in the fitting gap. Is exposed. Subsequently, the halves of the joint member 30 are combined so as to cover the second connection portion 42 of the connection member 40 and the fitting gap, and the end surface of the first base end portion 31 is the first pipe cover 20a. It arrange | positions so that the end surface in the edge part 24 may be contact | connected, and the joint member 30 and the 1st piping cover 20a are combined with the sealing material 50. FIG.

  By the above method, the pipe cover 20 is covered with the inner pipe 10, and the second pipe cover 20 b adjacent to the first pipe cover 20 a (here, the connecting member assembled to the cover main body 21) is disposed inside the joint member 30. 40) completes the joint structure 2 that is fitted in the longitudinal direction of the inner pipe 10 so as to be relatively movable. According to such a joint structure 2, as shown in FIGS. 2 and 4, for example, a displacement (displacement that is separated from each other) based on thermal contraction or the like between the first piping cover 20 a and the second piping cover 20 b. Even if this occurs, the second pipe cover 20b (here, the connecting member 40) and the joint member 30 move relative to each other along the length direction of the pipe 1 (inner pipe 10). Since the second connection portion 42 fitted into the first connection portion 32 is pulled out from the first connection portion 32 and moves away from the first connection portion 32, the second piping cover 20b fitted here at least inside the joint member 30 (here Then, the shift can be eliminated by the length of the second connecting portion 42) of the connecting member 40. As a result, the situation in which the inner pipe 10 is exposed due to the displacement of the pipe cover 20 is less likely to occur, and problems such as the occurrence of condensation and poor appearance are less likely to occur.

  Further, in the present embodiment, the joint member 30 is formed in a cylindrical shape, and is composed of a combination of halves that are cut in the direction of the cylinder axis. Therefore, the first pipe cover 20a disposed on the outer periphery of the inner pipe 10 and The joint member 30 can be suitably retrofitted between the second pipe cover 20b (here, the connection member 40). That is, the joint member 30 is provided between the first pipe cover 20a and the second pipe cover 20b by covering the inner pipe 10 or the second pipe cover 20b (here, the connection member 40) with each half. Can be retrofitted.

  Further, in the present embodiment, the second piping cover 20 b includes a cover body 21 and a connection member 40 attached to the end portion 26 of the cover body 21, and the connection member 40 is disposed on the inner side of the joint member 30. 10 is fitted so as to be relatively movable along the length direction. Therefore, the connecting member 40 attached to the end portion 26 of the cover main body 10 bears the joint structure 2, that is, displacement between the first piping cover 20 a and the second piping cover 20 b (displacement so as to be separated from each other). Even if this occurs, since the connecting member 40 and the joint member 30 move relative to each other along the length direction of the pipe 1 (inner pipe 10), at least the connecting member 40 fitted inside the joint member 30 is used. It is possible to eliminate the shift by the length of. As a result, the inner pipe 10 is exposed due to the displacement of the pipe cover 20, and the occurrence of dew condensation and the occurrence of defects such as poor appearance are less likely to occur.

  Moreover, in this embodiment, since the connection member 40 consists of what combined the half shape of the shape cut | disconnected in the pipe-axis direction, it is the 1st piping cover 20a distribute | arranged to the outer periphery of the inner side piping 10, and the cover main body 21. The connection member 40 can be suitably attached later. That is, the joint member can be suitably retrofitted between the first pipe cover 20a and the cover main body 21 by covering each half so as to sandwich at least the inner pipe 10.

  In the present embodiment, the joint member 30 and the connection member 40 constituting the joint structure 2 may be made of a resin material different from the first pipe cover 20a and the second pipe cover 20b. In particular, when the first connecting portion 32 and the second connecting portion 42 are displaced in directions away from each other as shown in FIGS. 2 and 4, the thickness for protecting the inner pipe 10 is the first pipe cover 20 a and the second pipe. Since it is thinner than the cover 20b, a material with higher heat insulation may be employed. Moreover, since the 1st connection part 32 and the 2nd connection part 42 become the structure which fitted one side in the other, dimensional stability may be desired more, In such a case, 1st piping A material that hardly causes thermal expansion (thermal contraction) as compared with the cover 20a and the second pipe cover 20b may be employed.

<Embodiment 2>
A second embodiment having a configuration according to the present invention will be described with reference to FIGS. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The pipe 1a according to the second embodiment is different from the joint structure 2 of the first embodiment in the joint structure 2a. Specifically, the joint member 300 and the connection member 400 constituting the second pipe cover 20c are the first embodiment. It is thicker than the joint member 30 and the connection member 40.

  In the joint member 300, the first base end portion 301 on the side in contact with the end portion 24 of the first pipe cover 20a has an inner diameter that can cover the inner pipe 10 similarly to the first pipe cover 20a. It has a cylindrical shape having a thickness larger than that of the cover 20a, that is, has an outer diameter larger than that of the first piping cover 20a. Further, in the joint member 300, the first connection portion 302 extending from the first base end portion 301 toward the second piping cover 20 c side is the same as the first base end portion 301, similarly to the first connection portion 32 of the first embodiment. Although it has an outer diameter and the inner diameter is larger than the first base end portion 31, the outer diameter is larger than that of the first connection portion 32 of the first embodiment. ing.

  Further, the connecting member 400 of the second piping cover 20c has a second base end portion 401 on the side in contact with the end portion 26 of the cover main body 21 having a larger thickness than the cover main body 21 (the first base end portion 301 of the joint member 300). And the cover body 21 has an inner diameter that can cover the inner pipe 10. Further, in the connection member 400, the second connection portion 402 extending from the second base end portion 401 to the first piping cover 20a side is the same as the second base end portion 401, like the second connection portion 42 of the first embodiment. While having an inner diameter, the outer diameter is smaller than that of the second base end portion 401, specifically, smaller than the inner diameter of the first connection portion 302 of the joint member 300. Compared to the first embodiment, the second connection portion 402 is configured to be thicker than the second connection portion 42 of the first embodiment because the outer diameter of the first connection portion 302 is larger. In addition, the sealing materials 52 and 53 have a configuration in which the sealing materials 52 and 53 are bonded along a step as illustrated in the drawing.

  According to the joint structure 2a provided in the second embodiment as described above, as shown in FIG. 8, for example, a displacement (separated from each other) based on thermal contraction or the like between the first pipe cover 20a and the second pipe cover 20c. Even when displacement occurs, the second pipe cover 20c (here, the connecting member 400) and the joint member 300 are relatively moved along the length direction of the pipe 1a (inner pipe 10). Specifically, since the second connection portion 402 fitted into the first connection portion 302 is pulled out from the first connection portion 302 and moves in the direction of separation, at least the second connection portion 402 fitted inside the joint member 300 is used. The displacement can be eliminated by the length of the two piping covers 20c (here, the second connecting portion 402 of the connecting member 400). As a result, the situation in which the inner pipe 10 is not exposed due to the displacement of the pipe cover 20 is less likely to occur, and problems such as the occurrence of condensation and poor appearance are less likely to occur. Since it is configured to be thick, it is possible to exhibit a sufficient heat retaining function even when such a deviation occurs.

<Embodiment 3>
A third embodiment having the configuration according to the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment and the second embodiment are denoted by the same reference numerals and description thereof is omitted. The pipe 1b according to the third embodiment is different from the joint structure 2 of the first embodiment in the joint structure 2b. Specifically, the joint member 310 and the connection member 410 constituting the second pipe cover 20d are the first embodiment. The thickness of the first connection portion 312 of the joint member 310 is the same as the thickness of the first pipe cover 20a, and the second thickness of the connection member 410 is larger than that of the joint member 30 and the connection member 40. The thickness of the connecting portion 412 is the same as the thickness of the cover main body 21 of the second pipe cover 20d. Further, as compared with the joint structure 2a of the second embodiment, the first base end 311 has a tapered shape in order to eliminate a step based on the difference in thickness between the first pipe cover 20a and the first base end 311. The second base end portion 411 is also provided with a tapered shape so as to eliminate the step difference based on the difference in thickness between the cover main body 21 and the second base end portion 411. Further, the resin pins 60 for reinforcement are arranged to pass through the sealing materials 54 and 55, and the second connection portion 412 is pulled out from the inside of the first connection portion 312 to the first connection portion 312 of the joint member 310. When the relative movement is made in the direction, the cylindrical cover member 70 is used to eliminate a step (and thus a space formed based on the step) based on a difference in outer diameter between the first connection portion 312 and the second connection portion 412. Is arranged.

  More specifically, in the joint member 310, the first base end 311 on the side in contact with the end 24 of the first pipe cover 20a has an inner diameter that can cover the inner pipe 10 in the same manner as the first pipe cover 20a. The tube has a larger thickness than the first piping cover 20a, that is, has a larger outer diameter than the first piping cover 20a. And in order to eliminate the level | step difference by the difference in such an outer diameter, from the edge part 24 of the 1st piping cover 20a to the outer peripheral surface of the largest outer diameter part of the 1st base end part 311 in the 1st base end part 311 A tapered shape is formed by the inclined surface 311a which is inclined.

  Further, in the joint member 310, the first connection portion 312 extending from the first base end portion 311 to the second pipe cover 20d side has the same outer diameter as the maximum outer diameter of the first base end portion 301, and the inner diameter thereof. However, the inner diameter is larger than that of the first connection portion 32 of the first embodiment, so that the outer diameter is larger. Specifically, the thickness of the first connection part 312 is configured to be the same as the thickness of the first pipe cover 20 a, and the second of the connection member 410 is between the inner periphery of the first connection part 312 and the inner pipe 10. The connection portion 412 can be inserted. In addition, the sealing material 54 for assembling the 1st piping cover 20a and the coupling member 310 is stuck from the inclined surface 311a of the 1st base end part 311 to the 1st piping cover 20a, and the inclined surface 311a and the 1st piping are attached. On both covers 20a, resin pins 60 for reinforcing the sealing performance of the sealing material 54 are disposed through the sealing material 54, the first base end portion 311 and the first piping cover 20a.

  On the other hand, the connection member 410 of the second piping cover 20d has an inner diameter at which the second base end portion 411 on the side in contact with the end portion 26 of the cover main body 21 can cover the inner piping 10 like the cover main body 21. A cylindrical shape having a thickness larger than that of the cover main body 21 is formed, that is, an outer diameter larger than that of the cover main body 21 is provided. In order to eliminate such a step due to the difference in outer diameter, the second base end portion 411 is inclined from the end portion 26 of the cover main body 21 to the outer peripheral surface of the maximum outer diameter portion of the second base end portion 411. A tapered shape is formed by the inclined surface 411a.

  Further, in the connection member 410, the second connection portion 412 extending from the second base end portion 411 to the first piping cover 20a side is the same as the second base end portion 411, like the second connection portion 42 of the first embodiment. While having an inner diameter, the outer diameter is smaller than that of the second base end portion 411, specifically, the outer diameter is smaller than the inner diameter of the first connection portion 312 of the joint member 310. Compared to the first embodiment, the second connecting portion 412 is configured to be thicker than the second connecting portion 42 of the first embodiment because the outer diameter of the first connecting portion 312 is larger. Here, the thickness of the second connection portion 412 is the same as the thickness of the cover main body 21 and can be inserted into the inner periphery of the first connection portion 312 with a clearance 16 between the first connection portion 312 and the first connection portion 312. Has been. A seal material 55 for assembling the cover main body 21 and the connecting member 410 is pasted from the inclined surface 411a of the second base end portion 411 to the cover main body 21, and both the inclined surface 411a and the cover main body 21 are attached to both. A resin pin 60 for reinforcing the sealing performance of the sealing material 55 is disposed through the sealing material 55, the second base end portion 411 and the cover main body 21.

  By the way, in Embodiment 3, a cylindrical cover member 70 extending to the second piping cover 20d side is disposed at the end of the outer periphery of the first connection portion 312 on the second piping cover 20d side. . As shown in FIG. 9, when the second connecting portion 412 is fitted inside the first connecting portion 312 as shown in FIG. 9, the tip of the cover member 70 extends to the cover main body 21, while as shown in FIG. In the state where the second connection portion 412 is relatively moved in the direction of exiting from the inside of the first connection portion 312, the outer periphery of the second connection portion 412 that has moved relatively is covered, while the distal end thereof covers the second base end portion 411. It will be in a position.

  According to the joint structure 2b provided in the third embodiment as described above, as shown in FIG. 10, for example, a displacement (separate from each other) based on thermal contraction or the like between the first pipe cover 20a and the second pipe cover 20d. Even when displacement occurs, the second piping cover 20d (here, the connecting member 410) and the joint member 310 move relative to each other along the length direction of the piping 1b (inner piping 10). Specifically, since the second connection portion 412 fitted in the first connection portion 312 is pulled out from the first connection portion 312 and moves in the direction of separation, at least the second connection portion 412 fitted inside the joint member 310 is used. The displacement can be eliminated by the length of the two piping covers 20d (here, the second connecting portion 412 of the connecting member 410). As a result, the situation where the inner pipe 10 is not exposed due to the displacement of the pipe cover 20 is less likely to occur, and problems such as the occurrence of condensation and poor appearance are less likely to occur. Since it is configured to be thick, it is possible to exhibit a sufficient heat retaining function even when such a deviation occurs. In Embodiment 3, since the cylindrical cover member 70 extending to the second piping cover 20d side is disposed at the end of the first connecting portion 312 on the second piping cover 20d side, the second connecting portion 412 In a state of relative movement in the direction of exiting from the inside of the first connection portion 312, the step 17 based on the difference in outer diameter between the first connection portion 312 and the second connection portion 412, and hence the space 17 configured based on the step is formed. The cover member 70 covers the surface, so that the heat insulation is improved and the appearance defect is also eliminated.

<Embodiment 4>
A fourth embodiment having a configuration according to the present invention will be described with reference to FIGS. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The pipe 1c according to the fourth embodiment is different from the joint structure 2 of the first embodiment in the joint structure 2c. Specifically, the second pipe cover 20e does not include a connection member, and includes only a cover body made of foamed resin. Has been.

  Specifically, as shown in FIG. 11, the joint member 320 attached to the end of the first piping cover 20a on the second piping cover 20e side has the first piping in the second piping cover 20e on the inner side (inner periphery). The end portion on the cover 20a side can be fitted. As shown in FIG. 12, when the first piping cover 20a and the second piping cover 20e are displaced in directions away from each other due to heat shrinkage or the like, the end of the fitted second piping cover 20e The portion is configured to be relatively movable along the length direction of the inner pipe 10 in the direction of coming out of the joint member 320.

  In the joint member 320, the first base end portion 321 on the side in contact with the end portion of the first pipe cover 20a is configured by a base portion 321b and a connection portion 321c. The base 321b has a cylindrical shape similar to that of the first piping cover 20a and has an inner diameter capable of covering the inner piping 10, while having the same thickness as the first piping cover 20a, that is, the same outer surface as the first piping cover 20a. It is supposed to have a diameter. The connecting portion 321c has the same inner diameter as that of the base portion 321b and has an inner diameter capable of covering the inner pipe 10, and has a cylindrical shape having a thickness larger than that of the first pipe cover 20a, that is, the first pipe cover. It has an outer diameter larger than 20a. And in order to eliminate the level | step difference by the difference in such an outer diameter, the taper shape is formed in the connection part 321c by the inclined surface 321a inclined from the base part 321b to the outer peripheral surface of the largest outer diameter part of the connection part 321c. ing.

  In the joint member 320, the first connection portion 322 extending from the first base end portion 321 to the second piping cover 20e side has the same outer diameter as the maximum outer diameter of the first base end portion 321 and the inner diameter thereof. However, the inner diameter is larger than that of the first connection portion 32 of the first embodiment, and the outer diameter is larger. Specifically, the thickness of the first connection part 322 is configured to be the same as or slightly thinner than the thickness of the first pipe cover 20 a, and the second pipe is formed between the inner circumference of the first connection part 322 and the inner pipe 10. The cover 20e can be inserted. A sealing material 56 for attaching the first pipe cover 20a and the joint member 320 is pasted from the base part 321b of the first base end part 321 to the first pipe cover 20a.

  According to the joint structure 2c provided in the fourth embodiment as described above, as shown in FIG. 12, for example, a displacement (separate from each other) based on thermal contraction or the like between the first pipe cover 20a and the second pipe cover 20e. Even if a displacement occurs, the second pipe cover 20e and the joint member 320 move relative to each other along the length direction of the pipe 1c (inner pipe 10). Since the second piping cover 20e fitted in the connecting portion 322 moves in the direction of being pulled out and separated from the first connecting portion 322, at least the length of the second piping cover 20e fitted into the inside of the joint member 320. Deviations can be eliminated by minutes. As a result, the situation where the inner pipe 10 is exposed due to the displacement of the pipe cover 20 is less likely to occur, and problems such as the occurrence of condensation and poor appearance are less likely to occur.

<Other embodiments>
As mentioned above, although several embodiment of this invention was described, this invention is not limited to embodiment described with the said description and drawing, For example, the following embodiment is also in the technical scope of this invention. included.
For example, in the above embodiment, the refrigerant pipe in the air conditioner is exemplified as the pipe having the joint structure according to the present invention, but the joint structure according to the present invention is also applied to a pipe (for example, a water pipe) for transferring a liquid such as water. Is applicable.
Moreover, in Embodiment 1, although the invention is caught as the connection member 40 as a component of the second piping cover 20b, for example, the connection member 40 and the joint member 30 are caught as a set, and the connection member 40 and the joint member are captured. It is also possible to configure a joint part by 30 and distribute the joint part to the market.

DESCRIPTION OF SYMBOLS 1 ... Piping, 2 ... Joint structure, 10 ... Inner piping, 20 ... Piping cover, 20a ... 1st piping cover, 20b ... 2nd piping cover, 21 ... cover Main body, 24 ... end, 26 ... end, 30 ... joint member, 40 ... connecting member

Claims (4)

Inner piping,
In a pipe comprising a plurality of pipe covers arranged on the outer periphery of the inner pipe and added in the length direction of the inner pipe,
A joint member is attached to the end of the first pipe cover of the pipe cover, and a second pipe cover adjacent to the first pipe cover is provided along the length direction of the inner pipe inside the joint member. Piping cover joint structure fitted with relative movement.   The pipe cover joint structure according to claim 1, wherein the joint member is formed into a cylindrical shape and is formed by combining halves cut in the cylinder axis direction. The second piping cover includes a cover main body and a connection member attached to an end of the cover main body,
The pipe cover joint structure according to claim 1 or 2, wherein the connection member is fitted inside the joint member so as to be relatively movable along a length direction of the inner pipe.   The joint structure for a piping cover according to claim 3, wherein the connecting member is a combination of halves cut in the tube axis direction.

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