JP2014070780A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing a resin case from braking caused by freezing in winter.SOLUTION: In a resin case 10, a first flow passage 11 is separated into a plurality of rows, and a flow passage forming part 40 is provided which separates one row of the first flow passage 11 into a one direction flowing part 81 formed around an other direction piping part 22 and an other direction flowing part 82 formed around a one direction piping part 21. At the flow passage forming part 40, a hollow part 41 by space is formed.

Description

  The present invention relates to a heat exchanger that can be used, for example, as a water heater.

Since a heat exchanger used for a water heater is required to have pressure resistance and heat resistance, a double pipe made of copper pipe is generally used.
On the other hand, a heat exchanger has been proposed in which a resin case that accommodates a metal pipe is used, a heat medium is passed through the pipe, and heated water is circulated between the pipe and the resin case. (Patent Document 1).

JP 2002-333290 A

According to Patent Document 1, the bending work can be easily performed as compared with the formation of the double pipe by the metal pipe, and the external dimensions of the heat exchanger can be made compact by bending the metal pipe finely.
However, it is necessary to prevent damage to the resin case due to freezing in winter.

  Then, an object of this invention is to provide the heat exchanger which can prevent damage to the resin case by freezing in winter.

The heat exchanger according to the first aspect of the present invention includes a resin case that forms a first flow path through which a first fluid flows and a second flow path through which a second fluid flows, and is disposed in the first flow path. A one-way piping portion for flowing the second fluid in one direction, an other-direction piping portion for flowing the second fluid in the other direction, the one-way piping portion and the other direction. A bent portion that connects the pipe portion, and the inside of the resin case separates the first flow path into a plurality of rows, and the first flow passage of one row is connected to the other-direction pipe portion. The flow path forming part is provided to be separated into a one-way flow part formed around and the other-direction flow part formed around the one-way pipe part, and the flow path forming part has a hollow part due to space Is formed.
According to a second aspect of the present invention, in the heat exchanger according to the first aspect of the present invention, the heat exchanger according to the first aspect further includes a lid that covers the opening end of the first flow path and is fixed to the resin case. Protruding portions for arranging the bent portions are provided.
According to a third aspect of the present invention, in the heat exchanger according to the second aspect, a seal portion is provided at a portion of the pipe that protrudes from the resin case, and the lid portion includes a wall surface positioned at the opening end. And a pipe penetration part protruding from the wall surface, wherein the seal part and the pipe penetration part are sealed.
According to a fourth aspect of the present invention, in the heat exchanger according to the second or third aspect, one end of the flow path forming portion is arranged to face the bent portion, and the opening end and the flow path forming are arranged. The lid portion is fixed to the resin case so as to face the other end of the portion.
According to a fifth aspect of the present invention, in the heat exchanger according to the fourth aspect, the outer shapes of both ends of the one-way flow portion and the other-direction flow portion are substantially semicircular.
A water heater according to a sixth aspect of the present invention includes the heat exchanger according to any one of the first to fifth aspects.

  According to the present invention, the flow separating the first flow path in one row into the one-way flow part formed around the other-direction pipe part and the other-direction flow part formed around the one-way pipe part. The passage forming portion is provided, and the flow passage forming portion is formed with a hollow portion by space, so that the flow passage forming portion is easily deformed by the hollow portion, and therefore, even when the first fluid is expanded in volume by freezing in winter. The resin case can be prevented from being damaged.

1 is an external perspective view of a heat exchanger according to an embodiment of the present invention. Perspective view of resin case used in the heat exchanger Perspective view of piping used in the heat exchanger Perspective view of the lid used for the heat exchanger Exploded perspective view of the heat exchanger The perspective view which shows the assembly procedure of the heat exchanger Top view of resin case used in the heat exchanger Side view of the resin case Plan sectional view of the resin case Side sectional view of the resin case XX sectional view of FIG. Plan view of the flow path forming part used in the heat exchanger Side view of the flow path forming part YY sectional view of FIG. ZZ sectional view of FIG. Plan sectional view of the flow path forming part Side sectional view of the flow path forming part Plan sectional view of the heat exchanger Sectional drawing of the 1st flow path of the 1st row | line | column in FIG.

  In the heat exchanger according to the first embodiment of the present invention, one row of first flow paths is formed around a one-way flow part formed around the other-direction pipe part and around the one-way pipe part. A flow path forming part that separates into the other-direction flow part is provided, and a hollow part is formed in the flow path forming part. According to the present embodiment, the flow path forming portion is easily deformed by the hollow portion, and therefore, the resin case can be prevented from being damaged even when the first fluid is volume-expanded by freezing in winter.

  According to the second embodiment of the present invention, in the heat exchanger according to the first embodiment, a convex portion for arranging a bent portion is provided on the lid portion. According to the present embodiment, the pipe through which the second fluid flows causes a temperature difference between the inlet side and the outlet side by heat exchange, but the lid portion is formed by arranging the bent portion outside the resin case by the convex portion. The temperature difference between the pipes can be reduced, and the heat exchanger can be miniaturized and improved in assembly by arranging the bent portion on the convex portion.

  In the heat exchanger according to the second embodiment, a third embodiment of the present invention seals a seal portion provided at a portion protruding from a resin case of piping and a pipe penetration portion protruding from a wall surface. To do. According to this Embodiment, the sealing performance and assembly property of a heat exchanger can be improved.

  According to a fourth embodiment of the present invention, in the heat exchanger according to the second or third embodiment, one end of the flow path forming portion is arranged to face the bent portion, and the opening end and the flow path forming portion are The lid is fixed to the resin case so as to face the other end. According to the present embodiment, the pipe is inserted into the resin case, and then the flow path forming portion is inserted to face the bent portion, and finally the lid portion is fixed to the resin case. It is possible to improve the assembly of the heat exchanger.

  In the heat exchanger according to the fourth embodiment, the fifth embodiment of the present invention is such that the outer shapes of both ends of the one-way flow portion and the other-direction flow portion are substantially semicircular. According to the present embodiment, even when the first fluid remaining in the one-way flow portion and the other-direction flow portion expands in volume due to freezing in winter, the stress accompanying the volume expansion can be dispersed, and the resin case Can be prevented from being damaged.

  The water heater according to the sixth embodiment of the present invention includes the heat exchanger according to the first to fifth embodiments. According to the present embodiment, it is possible to provide a water heater provided with a heat exchanger that can prevent the resin case from being damaged due to freezing in winter.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of a heat exchanger according to this embodiment.
As shown in FIG. 1, the heat exchanger according to the present embodiment forms a resin case 10 forming a first flow path through which a first fluid flows, and a second flow path through which a second fluid flows. And a lid portion 30 that is fixed to the resin case 10. The pipe 20 protruding from the lid part 30 is formed with a parallel part 20a in a part thereof.

The heat exchanger according to the present embodiment uses, for example, water as the first fluid and, for example, a refrigerant as the second fluid. The heat exchanger according to this embodiment is connected to the compressor, the expansion valve, and the evaporator in a ring shape to form a refrigeration cycle, and the high-temperature refrigerant compressed by the compressor is introduced into the heat exchanger according to this embodiment. Is done. When the heat exchanger is used as a radiator as in this embodiment, the first fluid can be heated. By flowing water as the first fluid in a direction opposite to the introduced high-temperature refrigerant flow, the introduced water takes heat from the refrigerant and becomes hot water. Thus, the heat exchanger which produces | generates warm water can be utilized as water heaters, such as a heat pump water heater and a warm water heater.
In addition, when the heat exchanger by a present Example is utilized as an evaporator, a 1st fluid can be cooled.
In addition to the refrigerant, steam or hot water generated by a boiler can be used as the second fluid.

FIG. 2 is a perspective view of a resin case used in the heat exchanger.
Inside the resin case 10, the first flow path 11 is separated into a plurality of rows by partition walls 12.
In the present embodiment, the first flow path 11 is separated into five rows by the four partition walls 12. The resin case 10 has an open end 13 on one surface, and the first flow path 11 is open. The surface facing the open end 13 is a closed end 14 that is closed. On the outer periphery of the resin case 10 other than the open end 13 and the closed end 14, a plurality of rib portions 15 are formed so as to protrude. The plurality of rib portions 15 are provided at equal intervals, and are provided over the upper surface, the lower surface, and both side surfaces of the resin case 10. In addition, these rib parts 15 are provided ranging over the 1st flow path 11 isolate | separated into the some row | line | column.
For example, the resin case 10 is made of thermoplastic crystalline plastic, and polyphenylene sulfide resin (PPS) is suitable. The resin case 10 is integrally formed by a mold.

FIG. 3 is a perspective view of piping used in the heat exchanger.
The pipe 20 is bent to connect the one-way pipe part 21 for flowing the second fluid in one direction, the other-direction pipe part 22 for flowing the second fluid in the other direction, and the one-way pipe part 21 and the other-direction pipe part 22. Part 23. The pipe 20 is a metal pipe, and a copper pipe is suitable.
Here, one direction is a state in which the pipe 20 is disposed in the resin case 10, a direction from the opening end 13 toward the closed end 14, and the other direction is a state in which the pipe 20 is disposed in the resin case 10. The direction is from the end 14 toward the opening end 13. Therefore, one direction and the other direction are opposite directions.

A seal portion 24 is provided at a portion of the pipe 20 that protrudes from the resin case 10. One end of the pipe 20 forms an introduction connection pipe part 25a, the other end of the pipe 20 forms a lead-out connection pipe part 25b, and the seal part 24 is provided in the lead-in connection pipe part 25a and the lead-out connection pipe part 25b. The introduction connection pipe part 25 a and the lead-out connection pipe part 25 b on the end side of the seal part 24 protrude from the lid part 30.
The seal portion 24 is configured by a seal plate welded concentrically around the pipe 20 and an O-ring disposed in a groove provided on the outer periphery of the seal plate.

In the present embodiment, the pipe 20 is branched into four in parallel.
The pipe 20 has a first bent portion 23 connected to a downstream end portion of the first one-way pipe portion 21, and an upstream end portion of the first other-direction pipe portion 22 is connected to the first bent portion 23. A second bent portion 23 is connected to the downstream end of the first other-direction piping portion 22. And the second bent part 23 is connected to the upstream end of the second one-way pipe part 21, and the third bent part 23 is connected to the downstream end of the second one-way pipe part 21, The third bent portion 23 is connected to the upstream end portion of the second other-direction piping portion 22, and the fourth bent portion 23 is connected to the downstream end portion of the second other-direction piping portion 22. . In this way, the pipe 20 is configured such that the second fluid flowing in the one-way pipe part 21 and the second fluid flowing in the other-direction pipe part 22 are directed in opposite directions, the one-way pipe part 21, the bent part 23, and the other direction. The piping part 22 is connected continuously.

Therefore, the pipe 20 according to the present embodiment includes an introduction connecting pipe part 25a, a first one-way pipe part 21, a first bent part 23, a first other-way pipe part 22, a second bent part 23, a second one. One-way piping part 21, third bending part 23, second other-direction piping part 22, fourth bending part 23, third one-way piping part 21, fifth bending part 23, third other Directional piping part 22, sixth bent part 23, fourth one-way pipe part 21, seventh bent part 23, fourth other-directional pipe part 22, eighth bent part 23, fifth one-way pipe The part 21, the ninth bent part 23, the fifth other-direction pipe part 22, the tenth bent part 23, and the lead-out connecting pipe part 25b are sequentially formed.
In addition, although the piping 20 was demonstrated from each structure and function as the introductory connecting pipe part 25a, the one-way piping part 21, the bending part 23, the other direction piping part 22, and the derivation | leading-out connecting pipe part 25b, the piping 20 It is preferable to constitute by bending one copper tube without being connected by welding.
In the present embodiment, since the pipe 20 is branched in parallel into four, the first one-way pipe portion 21, the first bent portion 23, and the first other-direction pipe portion 22 are each four. Will have.
Moreover, the one-way piping part 21 and the other-direction piping part 22 are not straight pipes but are formed in a wave shape.

FIG. 4 is a perspective view of a lid used in the heat exchanger.
The lid portion 30 includes a wall surface 31 located at the opening end 13 and a pipe penetration portion 32 that protrudes from the wall surface 31. The wall surface 31 covers the open end 13 of the first flow path 11. The pipe penetration part 32 is disposed on both sides of the wall surface 31. A convex portion 33 is provided on the wall surface 31 of the lid portion 30. The convex portion 33 is disposed between the two pipe penetration portions 32. A bent portion 23 is disposed on the opening end 13 side of the convex portion 33. A seal portion 24 is disposed in the pipe penetration portion 32.

  The pipe penetration part 32 has a cylinder part 32b for introducing the first fluid or a cylinder part 32c for deriving the first fluid, in addition to the cylinder part 32a that penetrates the pipe 20. The cylindrical portion 32 a that penetrates the pipe 20 and the cylindrical portion 32 b that introduces the first fluid or the cylindrical portion 32 c that derives the first fluid have a direction perpendicular to the wall surface 31 as an axis. In addition, the pipe penetrating part 32 includes a holed cylinder part 32d for forming a hole that communicates the cylindrical part 32a that penetrates the pipe 20 and the cylindrical part 32b that introduces the first fluid, and a pipe. A hole portion 32d for forming a hole communicating the cylinder portion 32a penetrating the tube 20 and the cylinder portion 32c leading out the first fluid at the time of resin integral molding. These punched hole cylinder portions 32d are closed by a stopper 32e having a seal material on the outer periphery.

The pipe penetrating portion 32 disposed on one side of the wall surface 31 includes a cylindrical portion 32a that leads out the second fluid, a cylindrical portion 32b that introduces the first fluid, and a cylindrical portion 32d for hole.
The pipe penetrating portion 32 disposed on the other side of the wall surface 31 includes a cylindrical portion 32a for introducing the second fluid, a cylindrical portion 32c for deriving the first fluid, and a cylindrical portion 32d for a hole.
The lid 30 is made of the same material as that of the resin case 10, and is made of, for example, thermoplastic crystalline plastic, and polyphenylene sulfide resin (PPS) is suitable.
The lid part 30 is integrally formed of resin.
A plurality of fastening holes 34 are provided on the outer periphery of the wall surface 31 in order to fix the lid 30 to the resin case 10.

FIG. 5 is an exploded perspective view of the heat exchanger.
The heat exchanger includes a resin case 10, a pipe 20, a flow path forming part 40, a packing 50, and a lid part 30.
The flow path forming part 40 is arranged in the resin case 10, and the one-way flow part formed around the other-direction pipe part 22 in the first flow path 11 in one row and the periphery of the one-way pipe part 21. And the other-direction flow part formed in the.
The packing 50 is disposed between the resin case 10 and the lid 30, and the airtightness between the resin case 10 and the lid 30 and the airtightness between the flow path forming unit 40 and the lid 30. Secure.

The heat exchanger includes a first fluid introduction pipe 61 that introduces a first fluid, a first fluid introduction pipe 62 that introduces a first fluid, a second fluid introduction pipe 71 that introduces a second fluid, and a second fluid. A second fluid outlet pipe 72 is provided.
The first fluid introduction pipe 61 is connected to the cylindrical portion 32b that introduces the first fluid. The first fluid outlet pipe 62 that leads out the first fluid is connected to the cylindrical portion 32c that leads out the first fluid. The second fluid introduction pipe 71 for introducing the second fluid is connected to the introduction connecting pipe portion 25a. The second fluid outlet pipe 72 that leads out the second fluid is connected to the outlet connecting pipe portion 25b.

The first fluid introduction pipe 61 is substantially parallel to the wall surface 31 by having an L-shaped bent part until it is connected to the pipe penetration part 32 disposed on one side of the wall surface 31. A parallel portion 61 a that extends from one side of the wall 31 to the other side of the wall 31 is provided.
The convex part 33 is made to protrude in the space produced between the wall surface 31 and the parallel part 61a.
Further, as shown in FIG. 1, the lead-out connecting pipe portion 25 b for leading the second fluid is also substantially parallel to the wall surface 31 by forming an L-shaped bent portion, and from one side of the wall surface 31. A parallel portion 20 a reaching the other side portion of the wall surface 31 is formed.

Next, a method for assembling the heat exchanger will be described with reference to FIG.
FIG. 6 is a perspective view showing an assembly procedure of the heat exchanger.
First, as shown in FIG. 2A, the pipe 20 is inserted from the open end 13 and placed in the resin case 10. A first one-way piping portion 21 and a first other-direction piping portion 22 are arranged in the first flow path 11 in one row.

  Next, as shown in FIG. 5B, the flow path forming portion 40 is inserted from the open end 13 and one end of the flow path forming portion 40 is opposed to the bent portion 23 located on the closed end 14 side, It arrange | positions in the case 10 made. The flow path forming portion 40 is disposed between the first one-way piping portion 21 and the first other-direction piping portion 22 that are disposed in the first flow passage 11 in one row. By disposing the flow path forming part 40, one row of the first flow paths 11 is formed around the one-way flow part 22 around the other-direction pipe part 22 and the other around the one-way pipe part 21. It can be separated into a directional flow section.

  In FIG. 2C, the packing 50 is disposed at the opening end 13. The packing 50 is located on the outer periphery of the open end 13 and the flow path forming portion 40, and has an airtightness between the resin case 10 and the lid portion 30 and an airtightness between the flow path forming portion 40 and the lid portion 30. Can be secured.

  In FIG. 4D, the lid 30 is brought into contact with the open end 13 and the other end of the flow path forming portion 40 and the lid 30 is fixed to the resin case 10 using a fastener 35. Both ends of the pipe 20 pass through the cylindrical portion 32 a for introducing the second fluid and the cylindrical portion 32 a for extracting the second fluid, and are protruded from the resin case 10. The seal part 24 is located in the cylinder part 32a.

As shown to the figure (e), the piping 20 arrange | positioned at the cylinder part 32a which guide | derived the 2nd fluid provides the L-shaped bending part, and the parallel part 20a is formed. The pipe 20 in which the parallel part 20a is formed is connected to a second fluid outlet pipe 72 that guides the second fluid. Moreover, the piping 20 arrange | positioned at the cylinder part 32a which introduces a 2nd fluid connects with the 2nd fluid introduction pipe | tube 71 which introduces a 2nd fluid.
The state shown in FIG. 1 is obtained by connecting the first fluid introduction pipe 61 and the first fluid outlet pipe 62 from the state shown in FIG.

Below, the detailed structure of a main structural member is demonstrated.
7 is a plan view of a resin case used in the heat exchanger, FIG. 8 is a side view of the resin case, FIG. 9 is a plan sectional view of the resin case, and FIG. 10 is a side sectional view of the resin case. 11 is a sectional view taken along line XX in FIG.
In particular, as shown in FIGS. 7 and 8, the resin case 10 includes a plurality of ribs between the open end 13 and the closed end 14, each having a direction perpendicular to the flow direction of the first fluid. A portion 15 is provided.

Note that the plurality of rib portions 15 do not necessarily have to face in a direction orthogonal to the flow direction of the first fluid, and at least two rows of the first flow paths 11, for example, the first flow paths 11 a of the first row. And the first channel 11b in the second row.
In addition to these rib portions 15, rib portions 15 parallel to the flow direction of the first fluid are connected to the first flow passage 11 a in the first row, the first flow passage 11 b in the second row, and the first flow passage 11 b in the third row. It is preferable to provide in each of the one flow path 11c and the 1st flow path 11 of another row | line | column.

As shown in FIG. 9 to FIG. 11, the partition wall 12 that separates the first channel 11 a in the first row and the first channel 11 b in the second column is a partition that forms the first channel 11 a in the first row. 12a and partition walls 12b forming the first flow paths 11b in the second row.
Similarly, the partition wall 12 that separates the first flow path 11b in the second row and the first flow path 11c in the third row includes the partition wall 12c that forms the first flow passage 11b in the second row, and the third row. And a partition wall 12d forming the first flow path 11c. The same applies to the other partition walls 12.

The partition walls 12 a forming the first flow path 11 a in the first row and the partition walls 12 b forming the first flow path 11 b in the second row are connected by a plurality of rib portions 15. Further, the partition walls 12c forming the first flow path 11b in the second row and the partition walls 12d forming the first flow path 11c in the third row are connected by a plurality of rib portions 15. The same applies to the other partition walls 12.
Accordingly, the first flow paths 11 separated into a plurality of rows are connected by the rib portions 15 and spaces are formed other than the rib portions 15, so that the adjacent first flow paths 11, for example, the first flow paths 11 are formed. Heat transfer between the first flow path 11a in the second row and the first flow path 11b in the second row can be prevented.

In the present embodiment, a space is formed between the first flow paths 11 separated into a plurality of rows except for the rib portion 15, but may be connected without forming a space.
The first flow path 11 has a temperature gradient from a low temperature to a high temperature from the inlet toward the outlet, and not only in each row of the first flow passage 11 but also in the first flow passage 11 in one row depending on the position. Is different. Although not shown, the outer periphery of the resin case 10 is provided with a heat insulating material or covered with an outer case.
Therefore, by separating the outer peripheral portion of the resin case 10 into a plurality of spaces by the plurality of rib portions 15, heat transfer in the outer peripheral portion of the resin case 10 can be prevented, and heat dissipation loss can be reduced.

If the width of the first flow path 11 is W, the height is H, the width on the open end 13 side is W1, the height is H1, the width on the closed end 14 side is W2, and the height is H2, W1> W2, H1 > H2.
Thus, in the first flow path 11, the width W1 and the height H1 on the open end 13 side are made larger than the width W2 and the height H2 on the closed end 14 side, so that the flow path cross-sectional area on the open end 13 side. Becomes larger than the cross-sectional area of the flow path on the closed end 14 side. That is, the channel cross-sectional area of the first channel 11 continuously decreases in the direction from the open end 13 side to the closed end 14.
Therefore, the flow path forming unit 40 separates the first flow path 11 into a one-way flow part formed around the other-direction pipe part 22 and an other-direction flow part formed around the one-way pipe part 21. In this case, the channel cross-sectional area of the one-way flow portion decreases toward the downstream side, that is, from the opening end 13 toward the closed end 14, and the channel cross-sectional area of the other-direction flow portion decreases toward the downstream side. That is, it becomes larger from the closed end 14 toward the open end 13. Therefore, the flow rate is increased in the unidirectional flow portion to enhance the heat transfer promotion effect, and the pressure loss is reduced in the flow portion in the other direction, so that a heat exchanger with high heat exchange efficiency and low pressure loss as a whole can be realized.

12 is a plan view of a flow path forming portion used in the heat exchanger, FIG. 13 is a side view of the flow path forming portion, FIG. 14 is a YY sectional view of FIG. 13, and FIG. FIG. 16 is a cross-sectional plan view of the flow path forming portion, and FIG. 17 is a side cross-sectional view of the flow path forming portion.
The flow path forming portion 40 is formed with a hollow portion 41 by a space, is formed in a column shape by the upper surface 42, the lower surface 42 and the side surface 43, and both end surfaces 44 are closed. Enlarged portions 41 a are formed above and below the hollow portion 41.
A ridge 42 a is formed in the longitudinal direction at the center of each of the upper surface 42 and the lower surface 42. A concave portion 43a is formed in the side surface 43 in the longitudinal direction.
Since the flow path forming portion 40 is formed with a hollow portion 41 by space, the flow path forming portion 40 is easily deformed by the hollow portion 41, and therefore, even when the first fluid is volume-expanded by freezing in winter, Damage to the resin case 10 can be prevented.

18 is a plan sectional view of the heat exchanger, and FIG. 19 is a sectional view of the first flow path in the first row in FIG.
One flow path forming unit 40 is disposed in the first flow path 11a of the first row. One end of the flow path forming portion 40 is disposed in the first flow path 11 a so as to face the bent portion 23, and the other end of the flow path forming portion 40 faces the lid portion 30.
Then, as shown in FIG. 19, the first flow path 11 a in the first row is formed between the one-way flow part 81 formed around the other-direction pipe part 22 and the one-way pipe part 21. It is separated from the other-direction flow part 82 formed around.
Similarly, the first flow path 11b in the second row, the first flow path 11c in the third row, and the first flow passage 11 in the other rows are each similarly provided with one flow passage forming portion 40, and the one-way flow portion 81. And the other-direction flow part 82 are formed.

The one end 16a and the other end 16b in the cross section perpendicular to the flow direction of the unidirectional flow portion 81 are both substantially semicircular in outer shape and inner shape. The outer shape and inner shape of one end 16a and the other end 16b of the unidirectional flow portion 81 are concentric with the pipe 20, and the thickness of the substantially semicircular one end 16a and the other end 16b is constant.
The outer and inner shapes of the one end 17a and the other end 17b in the cross section perpendicular to the flow direction of the other-direction flow portion 82 are both substantially semicircular. The outer shape and the inner shape of the one end 17a and the other end 17b of the other-direction flow portion 82 are concentric with the pipe 20, and the thickness of the substantially semicircular one end 17a and the other end 17b is constant.
A flow path is formed between one end 16a of the one-way flow portion 81 and one end 17a of the other-direction flow portion 82, and between the other end 16b of the one-way flow portion 81 and the other end 17b of the other-direction flow portion 82. The case-side ridges 18 that protrude outward are formed at positions corresponding to the ridges 42 a of the part 40.

The outer ends 16a, 16b, 17a, and 17b of the one-way flow portion 81 and the other-direction flow portion 82 are substantially semicircular, so that they remain in the one-way flow portion 81 and the other-direction flow portion 82 in winter. Even when the first fluid to be expanded is subjected to volume expansion due to freezing, the stress accompanying the volume expansion can be dispersed, and damage to the resin case 10 can be prevented.
Further, the case-side ridges 18 corresponding to the ridges 42a of the flow path forming part 40 accurately arrange the flow path forming part 40 in the resin case 10, and the one-way flow part 81 and the other-direction flow part. 82 can be formed uniformly.
In this embodiment, the protruding height of the case-side ridge 18 is low, but by setting the height to be the same as the rib 15, heat transfer at the outer periphery of the resin case can be prevented, and heat dissipation loss can be reduced. Can be reduced.

  The present invention can be used as a water heater or a cooler using steam or high-temperature water generated by a boiler, in addition to the refrigerant.

DESCRIPTION OF SYMBOLS 10 Resin case 11 1st flow path 12 Partition 13 Open end 15 Rib part 16a One end 16b Other end 17a One end 17b Other end 20 Piping 21 One-way piping part 22 Other-direction piping part 23 Bending part 24 Seal part 30 Cover part 31 Wall surface 32 Pipe penetration part 33 Convex part 40 Flow path forming part 41 Hollow part 50 Packing 81 One-way flow part 82 Other-direction flow part

Claims (6)

A resin case forming a first flow path through which the first fluid flows, a second flow path through which the second fluid flows, and a pipe disposed in the first flow path;
Bending the pipe to connect the one-way piping part for flowing the second fluid in one direction, the other-direction piping part for flowing the second fluid in the other direction, and the one-way piping part and the other-direction piping part. Composed of parts and
The inside of the resin case separates the first flow path into a plurality of rows,
Forming a flow path that separates the first flow path in one row into a unidirectional flow section formed around the unidirectional piping section and an directional flow section formed around the unidirectional piping section Set up a section,
A heat exchanger characterized in that a hollow portion by a space is formed in the flow path forming portion.   The cover part which covers the opening end of the said 1st flow path, and is fixed to the said resin case is provided, The convex part which arrange | positions the said bending part was provided in the said cover part. Heat exchanger.   A seal portion is provided at a portion protruding from the resin case of the pipe, and the lid portion has a wall surface located at the opening end and a pipe penetration portion protruding from the wall surface, and the seal portion and the The heat exchanger according to claim 2, wherein the pipe penetration portion is sealed.   One end of the flow path forming portion is arranged to face the bent portion, and the lid portion is fixed to the resin case so as to face the opening end and the other end of the flow path forming portion. The heat exchanger according to claim 2 or 3.   5. The heat exchanger according to claim 4, wherein both end shapes of the one-way flow portion and the other-direction flow portion are substantially semicircular.   A water heater comprising the heat exchanger according to any one of claims 1 to 5.