JP5387436B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that performs heat exchange between water and a refrigerant, and a water refrigerant heat exchanger mounted on a heat pump water heater that heats water by exchanging heat between water and a refrigerant. It is suitable for use.

  The water-refrigerant heat exchangers disclosed in Patent Documents 1 and 2 form a box having a water flow path through which water flows and a serpentine shape, that is, a large number of folded water flow paths by partitioning the inside of the box. It is comprised by the waveform-shaped partition member and the tube which is provided in contact with the outer surface of a box and forms the refrigerant | coolant flow path through which a refrigerant | coolant flows.

  Furthermore, in the water-refrigerant heat exchanger disclosed in Patent Document 2, fins for heat transfer promotion, which are separate parts from the partition member, are arranged for each of the many folded water flow paths formed by one partition member. Yes. This fin has a wave shape and has a cut-and-raised portion that is partially cut and raised.

JP 2003-314975 A JP 2009-074772 A

  As described above, since the water refrigerant heat exchanger disclosed in Patent Document 2 is a separate part for the partition member and the fin, one partition member and a large number of fins are required, and the number of parts of the heat exchanger is large. At the time of manufacturing the water-refrigerant heat exchanger, a step of arranging one partition member and a step of arranging a large number of fins are required, and there is a problem that it takes time to assemble.

  In view of the above points, it is a first object of the present invention to provide a heat exchanger capable of reducing the number of parts and the number of assembly steps as compared with the prior art.

  In the water refrigerant heat exchanger disclosed in Patent Document 2, since the partition member and the fin are separate parts, the assembly dimensions of the partition member and the fin are considered in the arrangement relationship between the partition member and the fin inside the box. Thus, it is necessary to widen the distance between the partition member and the fin. This is to allow the fins to be installed in the respective water channels even when there are variations in the dimensions of the partition members and the fins when the fins are installed in the respective water channels after the partition members are arranged. Conventionally, the fins installed in each water channel are positioned and temporarily fixed by the claw portions provided in the partition member.

  For this reason, between the fin and the partition member becomes a bypass flow path in which water flows around the fin, and a large amount of water flows in the bypass flow path, which has a low pressure loss with respect to the fin. It was found from the results of the study by the present inventor that the effect is not sufficiently exhibited.

  In addition, at the time of manufacturing the water-refrigerant heat exchanger, after joining the partition member and the fin and making the state without the space between the partition member and the fin, a method of arranging this inside the box is conceivable. This method is not preferable because it requires two joints, that is, the partition member and the fins are joined together and the box and the box are joined.

  In view of the above points, it is a second object of the present invention to provide a heat exchanger capable of improving the heat transfer promotion effect by fins.

In order to achieve the first object, according to the first aspect of the present invention, the fin forming member (170) disposed in the box (150) connects the peak (173) and the valley (174). As the wall surface, it has a cut and raised surface (176) on which the cut and raised portion (176a) is formed, and a flat surface (177) on which the cut and raised portion is not formed,
The partition portion (172) is constituted by the flat surface (177), and one narrow channel (181) extending in one direction is formed by the adjacent flat surface (177), and the flat surface (177) in one direction is formed. A meandering water flow path is formed by providing a communication part (178) that connects adjacent narrow flow paths (181) at the end,
A fin portion (171) is constituted by the cut and raised surface (176), and a plurality of cut and raised surfaces (176) positioned between adjacent flat surfaces (177) are provided for each narrow channel (181). A part (171) is formed.

  As described above, in the present invention, a plurality of flat surfaces that serve as partitioning portions are provided for the fin forming member that forms the fin portion, and a cut-and-raised forming surface is provided for each narrow channel formed between adjacent flat surfaces. By adopting a plurality of arrangements, the plurality of partition portions and the plurality of fin portions are integrated. Thereby, according to this invention, compared with the case where a partition part and a fin part are comprised by another component, a number of parts can be reduced and the number of assembly processes can also be reduced.

In order to achieve the second object, in the invention according to claim 2, the fin portion (171) is adjacent to the corrugated section formed by the cut-and-raised portion (176a) in the water flow direction. It is an offset fin that is offset with respect to the cross-sectional wave shape part,
An average interval between adjacent cut and raised surfaces (176) is defined as a first width (L1), and an average interval between the flat surface (177) and the cut and raised surface (176) closest to the flat surface is a second width. When the width (L2) is set, the second width (L2) is equal to or shorter than the first width (L1).

  In order to achieve the second object, in the invention described in claim 3, in the invention described in claim 2, the second width (L2) is less than 60% of the first width (L1). It is characterized by being.

  Here, in the case where the partition part and the fin part are separate parts, the assembly dimensions had to be taken into consideration, so it was necessary to widen the distance between the partition part and the fin part. By adopting a configuration in which the two are integrated, the distance between the partition portion and the fin portion can be reduced as in the second and third aspects of the invention.

  Incidentally, in the case where the partition portion and the fin portion are separate parts, even if an attempt is made to design the second width (L2) to be narrow, the inventor's examination results show that the length is 60% of the first width (L1). Although it was a limit, by setting it as the structure which integrated the partition part and the fin part, the 2nd width (L2) is less than 60% of the 1st width (L1) like Claim 3. Can be.

  As a result, according to the second aspect of the present invention, compared to the case where the second width (L2) is longer than the first width (L1), the amount of water flowing through the bypass channel can be reduced, Since the amount of water flowing through the fin portion can be increased, the effect of promoting heat transfer by the fin portion can be improved. In addition, according to the invention described in claim 3, the amount of water flowing through the bypass passage can be reduced and the amount of water flowing through the fin portion can be increased compared to the case where the partition portion and the fin portion are separate parts. Since it can do, the effect of the heat transfer promotion by a fin part can further be improved.

In the invention according to claim 4, the communication portion (178) is disposed at one end of the flat surface (177) on one end side and the other end side,
The communication portions (178) of the adjacent flat surfaces are arranged at the ends of the different sides on the side away from the water outlet (152) of the box (150) and the water of the box (150). The side close to the outlet (152) is characterized by being arranged at the end on the same side.

  By setting the location of the communication portion in this way, one meandering flow path is formed in the region inside the box that is away from the water outlet, and one in the region on the water outlet side. It is possible to form a water channel in which the channel is branched into a plurality of channels. The water flowing near the water outlet in the box body has a high temperature due to heat exchange with the refrigerant, so that calcium is deposited in the water flow path. According to the present invention, the number of flow paths is one. Compared with, it is possible to increase the cross-sectional area of the flow path, so that water can be prevented from flowing due to calcium.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a figure which shows the whole structure of the heat pump type water heater in 1st Embodiment. It is a partial permeation | transmission top view of the water refrigerant | coolant heat exchanger 15 in FIG. It is a disassembled perspective view of the box 150 in FIG. It is a longitudinal cross-sectional view of the box 150 in FIG. It is an enlarged view of area | region A1 in FIG. It is a cross-sectional view of the box 150 in FIG. It is a cross-sectional view of the box in a comparative example. It is a figure which shows the flow volume distribution in the one narrow flow path 181 in 1st Embodiment. It is a figure which shows the flow volume distribution in one narrow channel in a comparative example. The longitudinal cross-sectional view of the box 150 of the water refrigerant heat exchanger in 2nd Embodiment is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
In this embodiment, the heat exchanger according to the present invention is applied to a water-refrigerant heat exchanger of a heat pump type water heater. In FIG. 1, the whole block diagram of the heat pump type water heater in this embodiment is shown.

  As shown in FIG. 1, the heat pump type hot water heater includes a hot water storage tank 10 for storing hot water, a water circulation passage 11 for circulating hot water in the hot water storage tank 10, and a heat pump cycle device 12 for heating the hot water. I have.

  The hot water storage tank 10 is a hot water tank that can retain hot hot water for a long time. Hot water stored in the hot water storage tank 10 is discharged from a hot water outlet 10a provided in the upper part of the hot water storage tank 10 and supplied to a kitchen or a bath. Tap water is replenished from a water supply port 10 b provided in the lower part of the hot water storage tank 10.

  An electric water pump 13 that circulates hot water is disposed in the water circulation passage 11. The hot water is supplied from the hot water outlet 10 c at the lower part of the hot water tank 10 → the electric water pump 13 → the water refrigerant heat exchanger 15 → the hot water tank 10. It flows in the order of the upper hot water supply inlet 10d.

  The heat pump cycle device 12 is a well-known refrigeration cycle in which an electric compressor 14, a water refrigerant heat exchanger 15, an expansion valve 16, an evaporator 17 and the like are sequentially connected by piping.

  The water-refrigerant heat exchanger 15 has a water passage 15a through which hot water flows and a refrigerant passage 15b through which the electric compressor 14 discharge refrigerant (high-temperature and high-pressure refrigerant) flows, and hot water and discharge refrigerant from the electric compressor 14 It is a heat exchanger for heating which makes it heat-exchange between and heats hot-water supply water.

  Next, a specific structure of the water refrigerant heat exchanger 15 of the present embodiment will be described. FIG. 2 shows a partially transparent plan view of the water-refrigerant heat exchanger 15.

  As shown in FIG. 2, the water-refrigerant heat exchanger 15 includes a thin rectangular box 150 that forms a water flow path 15a therein, and a refrigerant tube 160 that forms a refrigerant flow path therein.

  The box 150 has the shortest length in the height direction among the vertical direction (vertical direction in the figure), horizontal direction (left and right direction in the figure), and height direction (vertical direction in the drawing). The length is the longest. And the box 150 is arrange | positioned so that the height direction may correspond with the gravity direction.

  The flow direction of water in the water flow path 15a formed in the box 150 is horizontal, and from the water inlet 151 provided on one end side in the lateral direction of the box 150 to the water outlet 152 provided on the other end side. On the other hand, water flows while meandering as indicated by the arrows in the figure. 1 is connected to the water inlet side water pipe connected to the electric water pump 13 in FIG. 1, and the water outlet 152 is connected to the water outlet side connected to the hot water inlet 10d of the hot water storage tank 10 in FIG. Water piping is connected.

  The refrigerant tube 160 is provided in contact with the outer surface of the box 150. Specifically, the refrigerant tube 160 is a metal tube composed of three thin tubes 161, 162, and 163. The three thin tubes 161, 162, 163 are formed as a set, and are wound around the outer periphery of the box 150 in a spiral shape. In addition, although the refrigerant | coolant tube 160 makes three thin tubes 161,162,163 one set, it is good also considering two thin tubes as one set.

  A branch pipe 164 is connected to upstream ends of the three narrow tubes 161, 162, and 163. The branch pipe 164 divides the refrigerant discharged from the electric compressor 14 into the narrow pipes 161, 162, and 163. A branch pipe 165 is connected to the downstream ends of the three thin tubes 161, 162, and 163. The branch pipe 165 collects the refrigerant flowing out from the narrow pipes 161, 162, and 163 and flows it to the inlet side of the expansion valve 16.

  FIG. 3 shows an exploded perspective view of the box 150.

  As shown in FIG. 3, the box 150 is formed by joining the peripheral edges of two plates 153 and 154 that face each other with a space in between. One fin forming member 170 is disposed between the two plates 153 and 154. The two plates 153 and 154 and the fin forming member 170 are made of metal, for example, copper.

  The fin forming member 170 forms an offset fin portion 171 and a partition portion 172 that forms a water flow path 15a inside the box 150, and the offset fin portion 171 and the partition portion 172 are integrated with each other. It has become. The term “integrated” means that the shape is continuous with the same material and does not have a connecting portion.

  Specifically, the fin forming member 170 has a rectangular wave shape in which the cross-sectional shape substantially perpendicular to the water flow direction has a plurality of peaks 173 and valleys 174, and the peaks 173 and valleys 174 are formed. A plurality of connecting wall surfaces (wall surfaces excluding peaks and valleys) 175 are provided. As the wall surface 175, there are a cut-and-raised surface 176 in which a cut-and-raised portion 176a is formed by cutting and raising a part of the wall surface, and a flat surface 177 in which no cut-and-raised portion is formed in the entire water flow direction.

  The plurality of cut and raised formation surfaces 176 form offset fin portions 171, and the flat surface 177 forms partition portions 172. In the offset fin portion 171, when viewed from the water flow direction, the cross-sectional waveform portion formed by the cut-and-raised portion 176 a is offset from the adjacent cross-section waveform portion in the water flow direction.

  FIG. 4 shows a longitudinal sectional view of the box 150, and FIG. 5 shows an enlarged view of a region A1 in FIG. In FIG. 4, the flat surface 177 constituting the partitioning portion 172 of the fin forming member 170 is mainly shown, and the fin portion 171 is partially omitted. In FIG. 5, only the fin forming member 170 is shown.

  As shown in FIG. 4, a meandering water flow path is formed inside the box 150 by a flat surface 177.

  Specifically, a portion sandwiched between adjacent flat surfaces 177 among the plurality of flat surfaces 177 forms one narrow channel 181. The narrow channel 181 extends in one direction, in this example, the vertical direction of the box 150 (left and right direction in FIG. 4), and a plurality of narrow channels 181 are arranged in parallel.

  The flat surface 177 is provided with a communication portion 178 that connects the adjacent narrow flow paths 181 to one end or the other end in the longitudinal direction of the box 150, that is, the left-right direction in FIG. The communication portion 178 is formed by removing all the end portions of the flat surface 177. Note that the communication portion 178 may be configured by an opening provided at a part of the end of the flat surface 177.

  On the side away from the water outlet 152, the communication portion 178 is disposed at the end portion on the different side of the adjacent flat surface 177. That is, the first communication portion 178a on one end side in the vertical direction of the box body 150 and the second communication portion 178b on the other end side are arranged in the horizontal direction of the box body 150, that is, the water inlet 151 and the water outlet 152. They are lined up alternately in opposite directions.

  By this communication portion 178, water flows through one narrow channel 181, then makes a U-turn, changes the flow direction to the opposite direction, and flows through the adjacent narrow channel 181. In this way, one meandering water flow path is formed.

  On the other hand, on the side close to the water outlet 152, the communication portion 178 is disposed at the end portion on the same side in the adjacent flat surface 177. Accordingly, the meandering water flow path that branches from one to a plurality of channels in the middle of the flow path near the water outlet 152 instead of one meandering water flow path in the entire area from the water inlet 151 to the water outlet 152. It has become. In this example, as can be seen from the direction of water flow indicated by arrows in the four narrow channels 181 on the water outlet 152 side, one channel is branched into two.

Further, as shown in FIG. 5, a plurality of cut-and-raised surfaces 176 are located between adjacent flat surfaces 177. The plurality of cut-and-raised surfaces 176 form offset fin portions 171 arranged for each narrow channel 181. FIG. FIG. 6 is a cross-sectional view in a direction orthogonal to the water flow direction in one narrow channel 181. As shown in FIG. 6, the fin forming member 170 is sandwiched between the two plates 153 and 154, and the peak portions 173 and the valley portions 174 of the fin forming member 170 are joined to the plates 153 and 154.

  Then, the average interval between the adjacent cut-and-raised surfaces 176 in the fin portion 171 is the first width (fin width) L1, and the flat surface 177 that is the partition portion 172 and the cut-and-raised surface 176 that is closest to the flat surface 177 are used. Is the second width (bypass channel width) L2, the second width L2 is shorter than the first width L1 (L2 <L1), and is equal to the length of the first width L1. On the other hand, the length is 40% or more and 50% or less. In the example shown in FIG. 6, the second width L2 is about 45% of the first width L1. The first width L1 corresponds to the width of one peak and valley, and the first width L1 and the second width L2 are in the fin height direction (up and down in FIG. 6) as shown in FIG. This corresponds to the length at the center of the direction.

  The fin forming member 170 having such a structure can be manufactured as follows.

  First, a general offset fin is manufactured by cutting a flat copper plate and then pressing it with a mold to make the copper plate into a wave shape and at the same time form a cut and raised portion.

  On the other hand, the fin forming member 170 of the present embodiment cuts only a portion that becomes the fin portion 171 and does not cut a portion that becomes the partition portion 172 with respect to one flat copper plate. change. Further, as shown in FIG. 6, the cross-sectional wave shape of the fin forming member 170 is such that the width of the trough 174 connected to the flat surface 177 is different from the width of the other trough 174. The shape is set as one unit, and press molding is performed for each unit. In addition, the site | part used as the communication part 178 is removed before or after press molding. In this manner, the fin forming member 170 having the above-described structure can be manufactured.

  Next, main features of the water refrigerant heat exchanger 15 of the present embodiment will be described.

  (1) In the present embodiment, a plurality of flat surfaces 177 serving as the partition portions 172 are provided on the fin forming member 170 that forms the offset fin portion 171, and each narrow channel 181 formed between the adjacent flat surfaces 177 is provided. Further, by adopting a configuration in which a plurality of cut and raised forming surfaces 176 are arranged, the plurality of partition portions 172 and the plurality of fin portions 171 are integrated into one component.

  Therefore, according to this embodiment, compared with the case where the partition part 172 and the fin part 171 are comprised by another part, a number of parts can be reduced and the box 150 is attached at the time of the assembly | attachment of the water refrigerant | coolant heat exchanger 15. FIG. Since only one fin forming member 170 may be installed in the interior, the number of assembly steps can be reduced.

  (2) In this embodiment, since the partition part 172 and the fin part 171 are integrated, it is not necessary to consider an assembly dimension like the case where a partition member and a fin are separate parts, and in the box 150 inside. The space | interval of the partition part 172 and the fin part 171 can be narrowed.

  Here, in FIG. 7, the cross-sectional view of the box in a comparative example is shown. FIG. 7 is a cross-sectional view in a direction orthogonal to the water flow direction in one narrow channel, as in FIG. 6.

  In the comparative example shown in FIG. 7, the offset fin 210 and the partition plate 220, which are separate parts, are arranged inside the box 150. In the configuration of this comparative example, even if the second width L2 is designed to be narrow, the limit is 60% of the first width L1.

  On the other hand, in the present embodiment, the length of the second width L2 can be 40% or more and 50% or less with respect to the first width L1. For this reason, as described below, according to the present embodiment, the flow rate of the bypass channel that is a gap between the fin portion 171 and the partition portion 172 and flows through the fin portion 171 is larger than that of the comparative example. Can be reduced.

  FIG. 8 shows the flow rate distribution in one narrow channel 181 in this embodiment, and FIG. 9 shows the flow rate distribution in one narrow channel in the comparative example. 8 and 9 show the results of analysis of the cross-sectional structures shown in FIGS. 6 and 7 by steady calculation (SIMPLE method) using analysis software (STAR-CD), respectively. 8 and 9, the vertical scale indicates the same flow rate, and 0% to 100% of the horizontal axis indicates the position from the left end to the right end of one narrow channel shown in FIGS. Yes.

  In the flow rate distribution of the comparative example shown in FIG. 9, the positions near 10% and 90% in FIG. 9 are the positions of the bypass channels formed between the fins 210 and the partition plate 220 in FIG. The position of 20% to 80% is the position of the fin 210. As can be seen from FIG. 9, in the configuration of the comparative example, the flow rate in the bypass channel is larger than the flow rate in the fins 210.

  On the other hand, in the flow rate distribution of this embodiment shown in FIG. 8, positions near 10% and 90% in FIG. 8 are formed between the fin portion 171 and the partition portion 172 in FIG. Although it is a position of a bypass flow path, the flow volume in this bypass flow path is comparable as the flow volume in the fin part 171 of the position of 20%-80%. Further, the flow rate at the fin portion 171 is larger than the flow rate at the fin 210 of the comparative example.

  Therefore, according to this embodiment, it can be said that the heat transfer promotion effect by the fin part 171 can be improved compared with the comparative example of FIG.

  In the present embodiment, the length of the second width L2 is 40% or more and 50% or less of the first width L1, but the length of the second width L2 is set to L2 <. You may change to other length within the range of L1. However, it is preferable to set the length of the second width L2 within a range that is less than 60% of the first width L1. It is because the flow volume of a bypass flow path can be reduced rather than a comparative example by making it at least less than 60%.

  Further, in the present embodiment, the length of the second width L2 has been described based on the length of the first width L1, but when the third width L3 is used as a reference, the second width L2 in the example of FIG. The length of the width L2 is 1.2 times the length of the third width L3 (L2 / L3 = 1.2 / 1). According to this embodiment, the length of the second width L2 is set to It can be narrowed to the same length as the third width L3. Here, the third width L3 is an average interval between the cut-and-raised surfaces of the offset relationship in the cross-sectional shape of the fin forming member 170 viewed from the water flow direction. On the other hand, in the comparative example of FIG. 7, the length of the second width L2 is 1.5 times the length of the third width L3 (L2 / L3 = 1.2 / 1).

  (3) In the present embodiment, as shown in FIG. 4, on the side away from the water outlet 152, the adjacent flat surface 177 is arranged with a communication portion 178 at an end portion on a different side, and is close to the water outlet 152. On the side, in the adjacent flat surfaces 177, communication portions 178 are arranged at the end portions on the same side. As a result, inside the box 150, one meandering flow path is formed in the area away from the water outlet 152, and two flow paths are formed in the area on the water outlet 152 side. A water channel that branches into the channel is formed. In other words, in the region on the water outlet 152 side, the number of flow paths is increased to two while keeping the width of one flow path the same as the side away from the water outlet 152.

  Here, since the water flowing inside the box 150 is heated by heat exchange with the refrigerant, the water temperature rises from the water inlet 151 toward the water outlet 152, so the water flowing on the water outlet 152 side The higher the calcium is precipitated, the higher the temperature. For this reason, there is a problem that water does not flow due to precipitation of calcium.

  In contrast, in the present embodiment, in the region on the water outlet 152 side, a water flow path is formed in which the water flows in parallel through the two narrow flow paths 181, so that the number of flow paths remains one. In comparison, the channel cross-sectional area can be substantially increased, and water can be prevented from flowing due to the precipitation of calcium.

  Although it is conceivable to increase the channel cross-sectional area on the water outlet 152 side by making the width of the narrow channel 181 on the water outlet 152 side larger than the width of the narrow channel 181 on the water inlet 151 side, In this case, the wave shape of the fin forming member 170 must be changed on the water inlet side and the water outlet side. In contrast, according to the present embodiment, the channel cross-sectional area on the water outlet 152 side is increased only by setting the position of the communication portion 178 without changing the wave shape on the water inlet side and the water outlet side. Can be made.

(Second Embodiment)
In FIG. 10, the longitudinal cross-sectional view of the box 150 in this embodiment is shown. FIG. 10 corresponds to FIG.

  In the present embodiment, in the entire region from the water inlet 151 to the water outlet 152 inside the box body 150, the communication portion 178 is disposed at the end portion on the different side of the adjacent flat surface 177. That is, the first communication portion 178 a on one end side in one direction and the second communication portion 178 b on the other end side are alternately arranged in the lateral direction of the box body 150. Thus, one meandering channel is formed in the entire area from the water inlet 151 to the water outlet 152 inside the box 150.

  Also in this embodiment, since the partition part 172 and the fin part 171 are integrated, there exists the effect of (1) and (2) demonstrated in 1st Embodiment.

(Other embodiments)
(1) In each of the above-described embodiments, the box 150 is configured by the two plates 153 and 154. However, the box may be configured by bending one plate, and the box may be configured in other ways. It is also good.

  (2) In each of the above-described embodiments, the second width L2 is shorter than the first width L1 (L2 <L1) in order to improve the heat transfer promotion effect by the fins, but the viewpoint of reducing the number of parts Then, the second width L2 may be the same as the first width L1 (L1 = L2).

  In this case, since the widths of the peaks 173 and valleys 174 are uniform throughout the fin forming member 170, the fin forming member 170 can be easily manufactured.

  (3) In each of the above-described embodiments, one fin forming member 170 is disposed inside the box 150. However, the number of the fin forming members 170 may not be one and the number of parts may be less than the conventional one. For example, it may be divided into a plurality of parts.

  (4) In each of the above-described embodiments, the fin portion 171 is an offset fin. However, the fin portion 171 is not limited to the offset fin, and a cut-and-raised portion is partially formed with respect to a wave-shaped wall surface. As long as it is a fin, other types of fins may be used. For example, the flat cut-and-raised part may be a louver fin disposed obliquely with respect to the water flow direction.

  (5) In each above-mentioned embodiment, although the present invention was applied to the water refrigerant heat exchanger, the present invention may be applied to a heat exchanger other than the water refrigerant heat exchanger.

DESCRIPTION OF SYMBOLS 150 Box 160 Refrigerant tube 170 Fin formation member 171 Fin part 172 Partition part 173 Mountain part 174 Valley part 176 Cut and raise formation surface 176a Cut and raise part 177 Flat surface 178 Communication part 181 Narrow flow path

Claims (4)

A box (150) having a water flow path through which water flows;
A partition part (172) provided in the box (150) and partitioning the inside of the box (150) to form the water flow path in a serpentine shape;
A fin portion (171) for heat transfer promotion provided in the water flow path and having a cut-and-raised portion partially cut and raised with respect to the wall surface;
A heat exchanger that is provided in contact with the outer surface of the box (150) and includes a refrigerant tube (160) that forms a refrigerant flow path through which the refrigerant flows, and performs heat exchange between water and the refrigerant,
The box (150) has a cross-sectional corrugated shape having a plurality of peaks (173) and valleys (174) in contact with the inner surface of the box (150), the partition (172) and the fins A fin forming member (170) constituting the portion (171) is disposed,
The fin forming member (170) includes a cut and raised surface (176) on which the cut and raised portion (176a) is formed as a wall surface that connects the peak (173) and the valley (174), and the cut and formed surface (176). A flat surface (177) on which no raised portion is formed,
The partition portion (172) is configured by the flat surface (177), and one narrow channel (181) extending in one direction is formed by the adjacent flat surface (177), and the flat surface (177) The meandering water flow path is formed by providing the communication part (178) that connects the adjacent narrow flow paths (181) at the end in the one direction,
The fin portion (171) is configured by the cut-and-raised surface (176), and the narrow channel (176) is formed by the plurality of cut-and-raised surfaces (176) positioned between the adjacent flat surfaces (177). The heat exchanger is characterized in that the fin portion (171) is formed every 181). The fin portion (171) is an offset fin in which the cross-sectional wave shape portion formed by the cut and raised portion (176a) is offset with respect to the cross-sectional wave shape portion adjacent in the water flow direction,
An average interval between adjacent cut and raised surfaces (176) is defined as a first width (L1), and an average interval between the flat surface (177) and the cut and raised surface (176) closest to the flat surface is defined as The heat exchanger according to claim 1, wherein when the second width (L2) is set, the second width (L2) is equal to or shorter than the first width (L1). .   The heat exchanger according to claim 2, wherein the second width (L2) is less than 60% of the first width (L1). The communication portion (178) is disposed at the end portion on one end side or the other end side in the one direction of the flat surface (177),
The communication portions (178) of the adjacent flat surfaces are arranged at the end portions on different sides on the side away from the water outlet (152) of the box (150), and the box The heat exchanger according to any one of claims 1 to 3, wherein the heat exchangers (150) are arranged at the end portions on the same side on the side close to the water outlet (152).

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