JP2011252619A - Pipe for heat exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an internal hole of a pipe for heat exchange so that a pressure loss when fluid for heat exchange flows is minimized and a heat exchange characteristic of the fluid through the pipe for heat exchange is maintained well.SOLUTION: The resin pipe for heat exchange includes a plurality of linear pipes 18 respectively mountable at predetermined parts of a support 5 supported on a frame side 3 of a building 1, and a plurality of connection pipes 20 integrally connecting respective ends of the respective linear pipes 18 with each other and having axial centers 19 bendable circular-arcuately. The fluid 9 for heat exchange sequentially flows in the internal holes 8 of the respective pipes 18, 20. The peripheral wall of the connection pipe 20 is bent in a zigzag shape toward the axial direction and a groove 29 formed on the inner face side of the connection pipe 20 by the bending is in a spiral shape continuously extending around the axis 19 of the connection pipe 20 bent circular-arcuately.

Description

  The present invention relates to a heat exchanging pipe for allowing a heat exchanging fluid such as hot water to flow through an inner hole and enabling heat exchanging between the fluid and external air.

  Conventionally, the pipe for heat exchange is disclosed in Patent Document 1 below. According to this publication, a container is supported on a fixed side such as a building frame. The heat exchanging pipe is made of resin, and a plurality of linear pipes that can be respectively attached to predetermined portions of the support in the container and integrally connecting the ends of the linear pipes. And a plurality of connecting pipes whose axial centers can be bent in an arc shape. Each of these connecting pipes is formed with a bellows in order to facilitate bending thereof.

  At the time of attaching the heat exchanging pipe to the support, each straight pipe is attached to a predetermined portion of the support while the connecting pipes of the heat exchanging pipe are bent. Here, as described above, since each connection pipe is formed with a bellows for facilitating the bending, it is considered that the heat exchange pipe can be easily attached to the support. .

  Then, when a fluid for heat exchange is caused to flow through the inner hole of the heat exchange pipe, the fluid and the fluid on the outside of the heat exchange pipe are heat-exchanged through the heat exchange pipe, As a result, the above-described external fluid is warmed or cooled.

Japanese Utility Model Publication No. 2-133573

  By the way, as described above, each connection pipe of the heat exchange pipe is formed with a bellows, so that a plurality of annular grooves are formed at predetermined intervals in the axial direction on the inner surface side of each connection pipe. It has become.

  For this reason, when the fluid for heat exchange flows through the internal holes of the connecting pipe of the heat exchange pipe, vortices tend to be generated in the fluids that have entered the annular grooves. Therefore, there is a possibility that the pressure loss when the fluid flows through the inner hole of the heat exchange pipe becomes excessive. In addition, fluid tends to stay at the inner bottom of each annular groove, and therefore, the scale tends to accumulate at the inner bottom of each annular groove due to impurities in the fluid. If this occurs, the heat exchange characteristics of the fluid through the heat exchange pipe may deteriorate, and this heat exchange may be hindered.

  The present invention has been made by paying attention to the above-described circumstances, and an object of the present invention is to provide a heat exchange pipe in which a plurality of straight pipes and ends of each straight pipe are integrated. And a plurality of connecting pipes whose axial centers can be bent in an arc shape, and when the connecting pipes can be easily bent, the internal holes of the heat exchanging pipes are heated. The pressure loss when the replacement fluid flows is suppressed to a small level, and the heat exchange characteristics of the fluid through the heat exchange pipe are favorably maintained.

The invention of claim 1 includes a plurality of linear pipes 18 each attachable to a predetermined part of the support 5 supported on the housing side 3 of the building 1, and ends of the respective linear pipes 18. A plurality of connecting pipes 20 that are integrally connected and whose axis 19 can be bent in an arc shape are provided, and the heat exchange fluid 9 sequentially flows through the internal holes 8 of the pipes 18 and 20. In the resin heat exchange pipe
The peripheral wall of the connecting pipe 20 is bent in a zigzag shape in the axial direction, and a groove 29 on the inner surface side of the connecting pipe 20 generated by the bending is an axis 19 of the connecting pipe 20 bent in the arc shape. It is a pipe for heat exchange characterized by having a spiral shape continuously extending around.

  The invention of claim 2 is a heat exchange pipe characterized in that the groove 29 is formed in a plurality of strips extending in parallel with each other.

  The invention of claim 3 is that the inner diameter D2 of the protrusion 36 on the inner surface side of the connecting pipe 20 caused by the zigzag bend is substantially matched with the inner diameter D1 of the straight pipe 18 of the heat exchange pipe 7. It is a pipe for heat exchange according to claim 1 or 2 characterized by things.

  In the invention of claim 4, the inner diameter D2 of the protrusion 36 on the inner surface side of the connecting pipe 20 caused by the zigzag-shaped bending is made smaller than the inner diameter D1 of the linear pipe 18 of the heat exchange pipe 7, while 3. The heat exchange pipe according to claim 1, wherein an outer diameter D <b> 3 of the protrusion 37 on the outer surface side of the connecting pipe 20 is larger than an outer diameter D <b> 4 of the linear pipe 18.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

According to the first aspect of the present invention, a plurality of linear pipes each attachable to a predetermined portion of a support supported on the building side of a building, and ends of the respective linear pipes are integrally connected. In addition, in the resin heat exchanging pipe comprising a plurality of connecting pipes whose axis can be bent in an arc shape, the heat exchanging fluid sequentially flows through the internal holes of these pipes,
The peripheral wall of the connection pipe is bent in a zigzag shape in the axial direction, and the groove on the inner surface side of the connection pipe generated by the bending is continuously around the axis of the connection pipe bent in the arc shape. The spiral shape is extended.

  Here, at the time of attaching the heat exchange pipe to the support, each straight pipe is attached to a predetermined portion of the support while bending each connection pipe of the heat exchange pipe. In addition, since each connection pipe is formed with a spiral groove, the connection pipe can be easily bent, and thereby the heat exchanging pipe can be easily attached to the support.

  When the fluid for heat exchange flows through the inner hole of the connecting pipe of the above-described heat exchanging pipe, the fluid flowing along the inner surface side of the connecting pipe has the streamline of the axis of the connecting pipe described above. The inside of the groove flows continuously so as to form a spiral shape along the groove continuously extending around.

  For this reason, it is suppressed that a vortex arises in the fluid which entered the said groove | channel, Therefore, the pressure loss at the time of a fluid flowing through the internal hole of the said heat exchange pipe is suppressed small. Further, since the fluid is prevented from staying at the inner bottom portion of the groove, the accumulation of scale at the inner bottom portion of the groove due to impurities in the fluid is suppressed. Therefore, heat exchange characteristics such as heat radiation of the fluid through the heat exchange pipe are maintained well.

  According to a second aspect of the present invention, the groove is formed into a plurality of strips extending in parallel with each other.

  For this reason, as compared with the case where there are only one groove, if there are a plurality of grooves as described above, the pitch of each groove can be made longer. The fluid flowing along the inner surface side of the pipe flows more smoothly in the groove.

  Therefore, the pressure loss when the fluid flows through the inner hole of the heat exchanging pipe is further suppressed. In addition, it is more reliably prevented that the fluid stays in the inner bottom portion of the groove, and the accumulation of scale in the inner bottom portion of the groove is more reliably suppressed. For this reason, the fluid through the heat exchange pipe The heat exchange characteristics of are maintained better.

  According to a third aspect of the present invention, the inner diameter of the protrusion on the inner surface side of the connecting pipe generated by the zigzag bending is substantially matched with the inner diameter of the straight pipe of the heat exchange pipe.

  Therefore, when the fluid sequentially flows through the internal hole of the linear pipe and the internal hole of the connecting pipe, the fluid smoothly flows without being largely disturbed by the protrusion on the inner surface side of the connecting pipe. . Therefore, the pressure loss when the fluid flows through the internal hole of the heat exchange pipe is more reliably suppressed to be small.

  According to a fourth aspect of the present invention, the inner diameter of the protrusion on the inner surface side of the connecting pipe generated by the zigzag-shaped bending is made smaller than the inner diameter of the linear pipe of the heat exchange pipe, The outer diameter of the ridge is made larger than the outer diameter of the straight pipe.

  For this reason, according to the connecting pipe having the above structure, the average inner diameter (or outer diameter) of each part in the axial direction substantially matches the inner diameter of the linear pipe (or the outer diameter of the linear pipe). The thickness of each part in the axial direction of the connecting pipe can be made substantially equal to the thickness of the straight pipe. Therefore, although the groove is formed in the connection pipe, the connection pipe is ensured to have a predetermined strength against the pressure from the fluid.

FIG. 3 is a partial enlarged partial sectional view of FIG. 2. It is the top view which attached the pipe for heat exchange to the support body. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is explanatory drawing of the formation method of the pipe for heat exchange.

  Regarding the heat exchange pipe of the present invention, the heat exchange pipe integrally connects a plurality of straight pipes and ends of each straight pipe, and its axis can be bent in an arc shape. In the case where each of the connecting pipes can be easily bent, the pressure loss when the fluid for heat exchange flows through the inner hole of the heat exchanging pipe is suppressed to be small. In order to achieve the object of maintaining good heat exchange characteristics of the fluid through the heat exchange pipe, the form for carrying out the present invention is as follows: It is.

  That is, the resin heat exchange pipe is formed by integrating a plurality of linear pipes that can be attached to predetermined portions of the support body supported on the building side of the building, and the ends of each linear pipe. And a plurality of connecting pipes whose axial centers can be bent in a circular arc shape, and fluid for heat exchange sequentially flows through the internal holes of these pipes. The peripheral wall of the connecting pipe is bent in a zigzag shape in the axial direction, and the groove on the inner surface side of the connecting pipe generated by the bending is continuously around the axis of the connecting pipe bent in the arc shape. It is made to become the spiral shape extended to.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  1-3, the code | symbol 1 is a building and this building 1 is provided with the air conditioner 2 which adjusts the temperature of the air of the interior space (room | chamber interior). The air conditioner 2 includes a plurality of supports 5 attached to the ceiling, which is the housing side 3 of the building 1, by screws 4 or the like, and resin heat exchanges detachably attached to the supports 5. And a fluid pressurizing and supplying device 10 for flowing hot water, which is a fluid 9 for heat exchange, through the internal holes 8 of the heat exchange pipes 7.

  A plurality of the supports 5 are provided along the ceiling. Each of the supports 5 is attached to a top surface of the panel 14 made of a metal such as aluminum that extends horizontally along the ceiling, extends long along the top surface, and is juxtaposed with each other. And a plurality of locking tools 15 for detachably locking 7.

  The heat exchanging pipe 7 includes a plurality of linear pipes 18 that can be attached to a predetermined portion of the support 5 by a locking tool 15, and ends of the linear pipes 18. And a plurality of connecting pipes 20 whose axis 19 can be bent in an arc shape.

  More specifically, the heat exchanging pipe 7 has first to fifth pipes 22 to 26 that are sequentially stacked from the radially inner side to the outer side to form a multiple pipe structure. . The first and fifth pipes 22 and 26 are made of crosslinked polyethylene having excellent heat resistance, and the second and fourth pipes 23 and 25 face each other adjacent to each other in the radial direction of the heat exchange pipe 7. It is made of an adhesive resin such as a phthalic anhydride graft polymer for adhesion in a contact state, and the third pipe 24 is made of polyvinyl alcohol having an excellent property of blocking air permeation. Moreover, the internal diameter D1 of the linear pipe 18 of the said heat exchange pipe 7 is 10-25 mm, and the thickness of the linear pipe 18 is 1.0-2.5 mm. The length of the straight pipe 18 is about 1300 to 1500 mm, and the bending radius R of the axis 19 of the connecting pipe 20 is 40 to 60 mm.

  The temperature of the fluid 9 is 15 to 40 ° C., preferably 16 to 33 ° C. The flow rate of the fluid 9 in the internal hole 8 of the heat exchange pipe 7 is about 15 to 20 m / sec.

  Then, when the fluid 9 is caused to flow through the straight pipes 18 of the heat exchanging pipe 7 and the internal holes 8 of the connecting pipes 20 by the fluid pressure supply device 10 in sequence, the fluid 9 and the panel 14 Are exchanged through the heat exchange pipe 7, whereby the panel 14 is warmed or cooled. Then, the air in the internal space (indoor) of the building 1 is warmed or cooled by the radiant heat generated by the far infrared rays from the panel 14.

  The peripheral wall of the connecting pipe 20 is bent in a zigzag shape in the axial direction. And the groove | channel 29 by the side of the inner surface of the connection pipe 20 produced by this bending is made into the spiral shape extended continuously around the axial center 19 of the connection pipe 20 bent in circular arc shape as mentioned above. The zigzag shape is not strictly limited to a continuous Z shape, but is a concept including a wave shape.

  In FIG. 4, the heat exchanging pipe 7 is formed by an extruder as follows. That is, first, an intermediate product pipe (corresponding to the length of the connecting pipe 20) having a constant inner and outer diameter is continuously extruded and formed by an extruder. Next, each part of the intermediate product pipe corresponding to each connection pipe 20 of the heat exchange pipe 7 is sequentially sandwiched and heated by the split molds 32 and 33. Next, due to the negative pressure by the suction pump 34, each part of the intermediate product pipe is sequentially sucked in the thermoplastic state toward the inner surfaces of the split molds 32, 33, whereby the spiral groove 29 described above is formed. The formed connecting pipe 20 is formed.

  According to the above configuration, the peripheral wall of the connecting pipe 20 is bent in a zigzag shape in the axial direction, and the groove 29 on the inner surface side of the connecting pipe 20 generated by the bending is bent in the arc shape. A spiral shape continuously extending around 20 axis centers 19 is formed.

  Here, at the time of attaching the heat exchanging pipe 7 to the support 5, the straight pipes 18 are engaged with the predetermined portions of the support 5 while bending the connecting pipes 20 of the heat exchanging pipe 7. Each of the connecting pipes 20 is formed with a spiral groove 29 as described above, so that the connecting pipes 20 can be easily bent. The above-described heat exchanging pipe 7 can be easily attached to the support 5.

  When the fluid 9 for heat exchange flows through the inner hole 8 of the connection pipe 20 of the heat exchange pipe 7 described above, the stream line of the fluid 9 flowing along the inner surface side of the connection pipe 20 has the flow line described above. The inside of this groove | channel 29 is continuously flowed so that it may become a spiral shape along the groove | channel 29 continuously extended around the axial center 19 of the connecting pipe 20.

  For this reason, it is suppressed that a vortex arises in the fluid 9 which entered the said groove | channel 29, Therefore, the pressure loss at the time of the fluid 9 flowing through the internal hole 8 of the said heat exchange pipe 7 is suppressed small. Further, since the fluid 9 is prevented from staying at the inner bottom portion of the groove 29, the accumulation of scale at the inner bottom portion of the groove 29 due to impurities in the fluid 9 is suppressed. Therefore, heat exchange characteristics such as heat dissipation of the fluid 9 through the heat exchange pipe 7 (more specifically, heat transfer characteristics to the panel 14) are maintained well.

  The groove 29 has a plurality of strips extending in parallel with each other.

  For this reason, as compared with the case where the groove 29 has only one line, if the groove 29 has a plurality of lines as described above, the pitch of each groove 29 can be made longer. The fluid 9 that flows along the inner surface side of the connecting pipe 20 flows more smoothly in the groove 29.

  Therefore, the pressure loss when the fluid 9 flows through the internal hole 8 of the heat exchanging pipe 7 is further suppressed. Further, the fluid 9 is more reliably prevented from staying in the inner bottom portion of the groove 29, and the scale is more reliably prevented from accumulating in the inner bottom portion of the groove 29. The heat exchange characteristics of the fluid 9 are more favorably maintained.

  Further, the inner diameter D2 of the ridge 36 on the inner surface side of the connecting pipe 20 generated by the zigzag bending is substantially matched with the inner diameter D1 of the straight pipe 18 of the heat exchange pipe 7.

  For this reason, when the fluid 9 sequentially flows through the inner hole 8 of the straight pipe 18 and the inner hole 8 of the connecting pipe 20, the fluid 9 largely interferes with the protrusion 36 on the inner surface side of the connecting pipe 20. It flows smoothly without being done. Therefore, the pressure loss when the fluid 9 flows through the internal hole 8 of the heat exchanging pipe 7 is more reliably suppressed to be small.

  1 and 4, the inner diameter D2 of the protrusion 36 on the inner surface side of the connecting pipe 20 caused by the zigzag bend is formed by the straight pipe 18 of the heat exchange pipe 7 as indicated by a two-dot chain line. While being smaller than the inner diameter D1, the outer diameter D3 of the protrusion 37 on the outer surface side of the connecting pipe 20 is larger than the outer diameter D4 of the linear pipe 18.

  Here, when the connection pipe 20 having the above structure is formed, each part of the intermediate pipe is sandwiched while being pressed by the split dies 32 and 33, and once contracted in a slightly thermoplastic state in the radial direction. Be made. Then, each part of the intermediate product pipe is sequentially sucked toward the inner surfaces of the split molds 32 and 33 by the negative pressure by the suction pump 34, thereby forming the connection pipe 20 having the above structure. The

  According to the connecting pipe 20 having the above structure, the average inner diameter (or outer diameter) of each part in the axial direction substantially matches the inner diameter D1 of the linear pipe 18 (or the outer diameter D4 of the linear pipe 18). Therefore, the thickness of each part in the axial direction of the connecting pipe 20 can be made substantially equal to the thickness of the straight pipe 18. Therefore, although the groove 29 is formed in the connection pipe 20, the connection pipe 20 has a predetermined strength against the pressure from the fluid 9.

  Although the above is based on the illustrated example, the housing side 3 may be a wall or a floor. Further, the support 5 may be a frame. Further, the heat exchange pipe 7 may be located on the indoor side of the support 5. The fluid 9 may be cold water. Further, the groove 29 may be one or three or more.

DESCRIPTION OF SYMBOLS 1 Building 2 Air conditioner 3 Housing side 5 Support body 7 Heat exchange pipe 8 Internal hole 9 Fluid 10 Fluid pressurizing supply device 18 Straight pipe 19 Axis 20 Connection pipe 29 Groove 36 Projection 37 Projection 37 Projection D1 Inner diameter D2 Inner diameter of connecting pipe inner surface D3 Outer diameter of connecting pipe outer surface D4 Outer diameter of straight pipe R Bending radius

Claims (4)

A plurality of linear pipes that can be respectively attached to predetermined parts of a support supported on the building side of the building, and ends of the respective linear pipes are integrally connected to each other, and the axis is circular. In a resin heat exchange pipe comprising a plurality of connecting pipes that can be bent in an arc shape, and a fluid for heat exchange flowing sequentially through the internal holes of each of these pipes,
The peripheral wall of the connection pipe is bent in a zigzag shape in the axial direction, and the groove on the inner surface side of the connection pipe generated by the bending is continuously around the axis of the connection pipe bent in the arc shape. A heat exchange pipe characterized by having a spiral shape extending.   A pipe for heat exchange, wherein the groove is formed into a plurality of strips extending in parallel with each other.   The heat according to claim 1 or 2, wherein the inner diameter of the protrusion on the inner surface side of the connecting pipe generated by the zigzag bend substantially matches the inner diameter of the straight pipe of the heat exchange pipe. Replacement pipe.   The inner diameter of the protrusion on the inner surface side of the connecting pipe generated by the zigzag bend is made smaller than the inner diameter of the straight pipe of the heat exchange pipe, while the outer diameter of the protrusion on the outer surface side of the connecting pipe is 3. The heat exchange pipe according to claim 1, wherein the heat exchange pipe is larger than an outer diameter of the straight pipe.

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