JP2017020748A - Heat exchanger and manufacturing method for same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of inhibiting the detachment of heat transfer tubes from a header and the occurrence of clogging in the heat transfer tubes.SOLUTION: A heat exchanger (100) comprises: a plurality of heat transfer tubes (10); and a header (11). End portions of the plurality of heat transfer tubes (10) are fixed to the header (11). The header (11) includes a main body part (15); and a plurality of cylindrical upright wall parts (16). The heat transfer tubes (10) are joined to the plurality of upright wall parts (16), respectively. The heat exchanger (100) further comprises a joint reinforcement member (19) that is provided between the adjacent upright wall parts (16), and that is closely attached to both a specific surface (15p) of the main body part (15) and outer circumferential surfaces of the plurality of heat transfer tubes (10) to reinforce joint of the plurality of heat transfer tubes (10) to the header (11).SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a heat exchanger and a method for manufacturing the same.

  Conventionally, fin-and-tube heat exchangers have been used in air conditioners. The fin-and-tube heat exchanger has a plurality of heat transfer tubes and a plurality of fins integrated with the plurality of heat transfer tubes. The fins promote heat transfer on the air side. However, since the heat transfer tube is relatively thick, the fin-and-tube heat exchanger has a problem that the pressure loss on the air side is large.

  On the other hand, as shown in FIG. 7, a finless heat exchanger has also been proposed as a heat exchanger capable of reducing pressure loss on the air side (Patent Document 1). However, finless heat exchangers also have problems. That is, in manufacturing a finless heat exchanger, it is necessary to join a large number of heat transfer tubes to a header. In the process for joining the heat transfer tube to the header, it is difficult to position the heat transfer tube or the end of the heat transfer tube is clogged. In addition, considering mass productivity, it is desired to join all the heat transfer tubes to the header at the same time, so the above-described joining process becomes increasingly difficult.

  As shown in FIG. 8, a method has been proposed in which a pre-molded fin-tube group 118 and a tube group header 120 are inserted into a mold, and a resin is injected to join them together (Patent Document 2). Using this method, a plurality of fin-tube groups 118 can be simultaneously integrated with the tube group header 120.

JP 2004-218969 A JP 2002-225138 A

  The method described in Patent Document 2 is effective when the heat transfer tube is sufficiently thick. However, when a very thin heat transfer tube is used to improve the heat exchange efficiency, there is still a question about the effectiveness of the method described in Patent Document 2. When a very thin heat transfer tube is used, it is very difficult to reliably join a number of heat transfer tubes to the header without causing problems such as clogging of the heat transfer tubes.

  An object of the present disclosure is to provide a heat exchanger in which a large number of heat transfer tubes and headers are securely joined, and the heat transfer tubes are unlikely to come off the header or the heat transfer tubes are clogged. Another object of the present disclosure is to provide a technique that enables a large number of heat transfer tubes to be simultaneously and reliably joined to a header.

That is, this disclosure
A plurality of heat transfer tubes each forming a fluid flow path;
End portions of the plurality of heat transfer tubes are fixed, a header having at least one of a function of distributing the fluid to the plurality of heat transfer tubes and a function of collecting the fluid from the plurality of heat transfer tubes;
A heat exchanger comprising:
The header has a main body portion having an internal space as a flow path for the fluid, and a plurality of cylindrical standing wall portions that protrude from a specific surface of the main body portion and communicate with the internal space. The heat transfer tube is connected to each of the plurality of standing wall portions in a positional relationship in which the outer circumferential surface of the standing wall portion is in contact with the inner circumferential surface of the heat transfer tube,
The heat exchanger is provided between the adjacent standing wall portions, and is in close contact with both the specific surface of the main body portion and an outer peripheral surface of the plurality of heat transfer tubes, and the heat transfer tubes and the header. Provided is a heat exchanger further comprising a joint strengthening member for strengthening the joint.

  According to the heat exchanger of this indication, since many heat exchanger tubes and a header are joined reliably, a heat exchanger tube does not come off easily from a header. In addition, the heat transfer tube is not easily clogged.

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present disclosure. FIG. 2 is a partially enlarged sectional view of the heat exchanger shown in FIG. FIG. 3 is a diagram showing a method for manufacturing the heat exchanger shown in FIGS. 1 and 2. FIG. 4 is a partially enlarged cross-sectional view of a heat exchanger according to a modification. FIG. 5 is a partially enlarged cross-sectional view of a heat exchanger according to another modification. FIG. 6 is a diagram showing a method for manufacturing the heat exchanger shown in FIG. FIG. 7 is a perspective view of the heat exchanger described in Patent Document 1. FIG. FIG. 8 is a diagram illustrating a method for manufacturing a heat exchanger described in Patent Document 2.

  In a heat exchanger using a heat transfer tube, the heat exchange efficiency can be improved by making the heat transfer tube thinner. However, the thinner the heat transfer tubes, the more heat transfer tubes are required, and the number of joints between the many heat transfer tubes and the headers increases. In addition, the thinner the heat transfer tube, the lower the strength of the heat transfer tube itself. In such a case, even if the technique described in Patent Document 2 is adopted, it is difficult to reliably join a number of heat transfer tubes to the header without causing problems such as clogging of the heat transfer tubes. If the heat transfer tube is crushed or the heat transfer tube is clogged, fluid does not flow through that portion and heat exchange does not occur. As a result, the efficiency of the heat exchanger is reduced. In addition, if leakage occurs even at one place, the airtightness is lost and the fluid flows out of the heat exchanger. Therefore, a technique that enables a large number of thin heat transfer tubes to be simultaneously and reliably joined to the header is desired. In addition, there is a demand for a heat exchanger in which a large number of heat transfer tubes and headers are securely joined, and the heat transfer tubes are unlikely to come off the header or the heat transfer tubes are clogged.

The heat exchanger according to the first aspect of the present disclosure is:
A plurality of heat transfer tubes each forming a fluid flow path;
End portions of the plurality of heat transfer tubes are fixed, a header having at least one of a function of distributing the fluid to the plurality of heat transfer tubes and a function of collecting the fluid from the plurality of heat transfer tubes;
A heat exchanger comprising:
The header has a main body portion having an internal space as a flow path for the fluid, and a plurality of cylindrical standing wall portions that protrude from a specific surface of the main body portion and communicate with the internal space. The heat transfer tube is joined to each of the plurality of standing wall portions in a positional relationship where the outer circumferential surface of the standing wall portion is in contact with the inner circumferential surface of the heat transfer tube,
The heat exchanger is provided between the adjacent standing wall portions, and is in close contact with both the specific surface of the main body portion and an outer peripheral surface of the plurality of heat transfer tubes, and the heat transfer tubes and the header. The apparatus further includes a joining reinforcing member that strengthens joining.

  According to the heat exchanger of the 1st mode, since many heat exchanger tubes and a header are joined certainly, a heat exchanger tube does not come off easily from a header. In addition, the heat transfer tube is not easily clogged.

  In the second aspect of the present disclosure, for example, the heat transfer tube of the heat exchanger according to the first aspect includes a tube expansion portion as the end portion fixed to the standing wall portion. According to the 2nd aspect, the pressure loss of the fluid which flows through the inside of a heat exchanger can be reduced. Moreover, it is easy to join the heat transfer tube with a header.

  In the third aspect of the present disclosure, for example, when the thickness of the joint reinforcing member is defined by the dimension related to the protruding direction of the standing wall part from the specific surface of the heat exchanger according to the first aspect, The length of the heat transfer tube from the step formed at the boundary with the other portion to the opening end surface of the tube expansion portion is less than the thickness of the joint strengthening member. According to the 3rd aspect, joining with a heat exchanger tube and a header can be strengthened reliably by a joining reinforcement member.

  In the fourth aspect of the present disclosure, for example, the protruding height of the standing wall part from the specific surface of the heat exchanger according to the second or third aspect is formed at the boundary between the expanded pipe part and the other part. It exceeds the length of the heat transfer tube from the step to the opening end surface of the expansion portion, the opening end surface of the standing wall portion is in contact with the step, and the opening end surface of the expansion portion is separated from the specific surface of the header Yes. According to the 4th aspect, joining with a heat exchanger tube and a header can further be strengthened with a joining reinforcement member.

  In the fifth aspect of the present disclosure, for example, the header of the heat exchanger according to any one of the first to fourth aspects is provided on both sides of the plurality of heat transfer tubes. According to the 5th aspect, the number of parts of a heat exchanger can be reduced.

  In the sixth aspect of the present disclosure, for example, the heat transfer tube of the heat exchanger according to any one of the first to fifth aspects is formed of a resin. When the heat transfer tube is made of resin, the weight of the heat exchanger can be reduced. If a resin is used, a thin heat transfer tube can be manufactured at low cost.

  In the seventh aspect of the present disclosure, for example, the header of the heat exchanger according to any one of the first to sixth aspects is made of metal. According to the seventh aspect, it is easy to ensure the rigidity and strength of the heat exchanger.

  In the eighth aspect of the present disclosure, for example, the outer diameter of the heat transfer tube of the heat exchanger according to any one of the first to seventh aspects is in a range of 0.1 to 1.0 mm. When the heat transfer tube has such a size (outer diameter), the number of heat transfer tubes can be increased, and the heat transfer area per unit volume of the heat exchanger can be greatly increased.

The manufacturing method of the heat exchanger according to the ninth aspect of the present disclosure is as follows.
A plurality of heat transfer tubes each forming a fluid flow path;
End portions of the plurality of heat transfer tubes are fixed, a header having at least one of a function of distributing the fluid to the plurality of heat transfer tubes and a function of collecting the fluid from the plurality of heat transfer tubes;
A method of manufacturing a heat exchanger comprising:
The header has a main body portion having an internal space as a flow path for the fluid, and a plurality of cylindrical standing wall portions that protrude from a specific surface of the main body portion and communicate with the internal space. And
The manufacturing method includes:
Fitting the heat transfer tube to each of the plurality of standing wall portions in a positional relationship where the outer circumferential surface of the standing wall portion is in contact with the inner circumferential surface of the heat transfer tube;
Arranging a material in a space between the adjacent standing wall portions, forming a portion in contact with both the specific surface of the main body portion and the outer peripheral surfaces of the plurality of heat transfer tubes;
Is included.

  According to the 9th aspect, since many heat exchanger tubes can be joined to a header reliably, it can prevent that a heat exchanger tube remove | deviates from a header. Further, the heat transfer tube can be prevented from being clogged.

  In the tenth aspect of the present disclosure, for example, in the method for manufacturing a heat exchanger according to the ninth aspect, when forming the portion in contact with both the specific surface of the main body and the outer peripheral surfaces of the plurality of heat transfer tubes The material having fluidity is supplied to the space between the adjacent standing wall portions and solidified. According to the tenth aspect, it is possible to fill the space between the many standing wall portions with no material. Therefore, all the heat transfer tubes can be reliably joined to the header.

  In an eleventh aspect of the present disclosure, for example, in the method for manufacturing a heat exchanger according to the ninth or tenth aspect, a barrier is disposed at a position facing the specific surface of the header, and the barrier is disposed between the barrier and the header. Forming the cavity, and filling and solidifying the cavity with the material to form the portion that contacts both the specific surface of the main body and the outer peripheral surfaces of the plurality of heat transfer tubes. . According to the eleventh aspect, the joining reinforcing member can be easily formed.

  Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments.

  As shown in FIG. 1, the heat exchanger 100 includes a plurality of heat transfer tubes 10, a first header 11, and a second header 12. The heat exchanger 100 is a so-called finless heat exchanger that does not have heat transfer fins. One end of the heat transfer tube 10 is fixed to the first header 11, and the other end of the heat transfer tube 10 is fixed to the second header 11. The plurality of heat transfer tubes 10 are arranged in parallel to each other. A gas flow path such as air is formed between adjacent heat transfer tubes 10. Each of the plurality of heat transfer tubes 10 has a flow path of fluid (water, refrigerant, etc.) that should exchange heat with a gas such as air. Each of the first header 11 and the second header 12 also has an internal space as a fluid flow path. All the heat transfer tubes 10 communicate with each of the first header 11 and the second header 12. According to the heat exchanger 100, it is possible to efficiently exchange heat between the fluid flowing outside the heat transfer tube 10 and the fluid flowing inside the heat transfer tube 10 by using the large surface area of the group of the heat transfer tubes 10.

  The first header 11 is provided with a fluid inlet 13 for guiding fluid from the outside of the heat exchanger 100 to the internal space of the first header 11. The first header 11 serves to distribute the fluid to the plurality of heat transfer tubes 10. The second header 12 is provided with a fluid discharge port 14 for discharging fluid from the internal space of the second header 12 to the outside of the heat exchanger 100. The second header 12 serves to collect fluid from the plurality of heat transfer tubes 10. The fluid is introduced into the first header 11 from the fluid inlet 13 and distributed to each of the plurality of heat transfer tubes 10. The fluids merge at the second header 112 and are discharged from the fluid discharge port 14 to the outside of the heat exchanger 100.

  The first header 11 and the second header 12 typically have the same structure. That is, in this embodiment, headers having the same structure are provided on both sides of the plurality of heat transfer tubes 10. In this case, the number of parts of the heat exchanger 100 can be reduced. However, as long as it has a necessary function, the structure of the first header 11 may be different from the structure of the second header 12.

  Further, when the internal space of the first header 11 is partitioned into two parts (a plurality of parts), the fluid introduction port 13 communicating with one of the two parts and the other one of the two parts communicate with each other. The first header 11 may be provided with a fluid discharge port 14 to be operated. In this case, the fluid inlet 13 and the fluid outlet 14 can be omitted from the second header 12. In the plurality of heat transfer tubes 10, a flow from the first header 11 to the second header 12 and a flow from the second header 12 to the first header 11 can be formed. Thus, the first header 11 and the second header 12 may have both a function of distributing fluid to the plurality of heat transfer tubes 10 and a function of collecting fluid from the plurality of heat transfer tubes 10. The structure of the first header 11 and the structure of the second header 12 are not limited as long as the fluid can flow appropriately through the heat transfer tube 10. Of course, the internal space of the second header 12 may be partitioned into two parts (a plurality of parts). The fluid inlet 13 and the fluid outlet 14 may be provided in each of the first header 11 and the second header 12.

  As shown in FIG. 2, the header 11 (and / or the header 12) includes a main body portion 15 and a plurality of standing wall portions 16. The main body 15 is a hollow structure having an internal space 17 as a fluid flow path. In the present embodiment, the main body portion 15 has a rectangular parallelepiped shape. The standing wall portion 16 is a cylindrical portion (in detail, a cylindrical shape) provided so as to protrude from the specific surface 15 p of the main body portion 15. The standing wall portion 16 communicates with the internal space 17 of the main body portion 15. The specific surface 15 p of the header 11 is a surface facing the header 12. The heat transfer tube 10 is connected to each of the plurality of standing wall portions 16 in a positional relationship in which the outer peripheral surface of the standing wall portion 16 is in contact with the inner circumferential surface of the heat transfer tube 10. With respect to the longitudinal direction of the heat transfer tube 10, the positions of the open end faces of the plurality of standing wall portions 16 coincide with each other. When the header 11 is viewed in plan, the plurality of standing wall portions 16 are provided on the header 11 in a regular arrangement such as a staggered arrangement or a lattice arrangement. The position of the heat transfer tube 10 can be accurately determined by the standing wall portion 16.

  The outer diameter of the heat transfer tube 10 is, for example, in the range of 0.1 to 1.0 mm. When the heat transfer tube 10 has a dimension (outer diameter) in such a range, the number of the heat transfer tubes 10 can be increased, and the heat transfer area per unit volume of the heat exchanger 100 can be greatly increased. This is advantageous for providing a highly efficient heat exchanger 100. In addition, when the heat transfer tube 10 has dimensions in such a range, even if the heat transfer tube 10 is made of resin, the heat exchange efficiency is the same as when the heat transfer tube 10 is made of metal. Can be achieved. That is, the material of the heat transfer tube 10 is not limited. For example, when importance is attached to the durability and strength of the heat exchanger 100, the metal heat transfer tube 10 is used, and when weight reduction of the heat exchanger 100 is important, the resin heat transfer tube 10 is used. Is done.

  On the other hand, when the heat transfer tube 10 is very thin, the reliability (strength) of the joint portion between the heat transfer tube 10 and the header 11 tends to be a problem. The structure shown in FIG. 2 is advantageous in increasing the reliability of the joint portion between the heat transfer tube 10 and the header 11. Further, the manufacturing method described later is advantageous for manufacturing the heat exchanger 100 using the thin heat transfer tube 10.

  The heat exchanger 100 further includes a bonding reinforcing member 19. The joint reinforcing member 19 is provided between the adjacent standing wall portions 16, and is in close contact with both the specific surface 15 p of the main body portion 15 and the outer peripheral surfaces of the plurality of heat transfer tubes 10, and the plurality of heat transfer tubes 10 and the header 11. It is the member which strengthens joining with. The joining reinforcement member 19 can prevent the heat transfer tube 10 from being detached from the header 11.

  In the present embodiment, the bonding reinforcing member 19 is provided along the surface (specific surface 15 p) of the main body 15 of the header 11 and covers the main body 15. That is, the joining reinforcing member 19 has a sheet-like structure. In addition, through holes are formed in the joint reinforcing member 19 at positions corresponding to the standing wall portion 16. The end portion of the heat transfer tube 10 and the standing wall portion 16 are located inside the through hole of the joint reinforcing member 19.

  The thickness T of the bonding reinforcing member 19 can be defined by a dimension related to the protruding direction of the standing wall portion 16 from the specific surface 15p of the header 11. In the present embodiment, the thickness T of the bonding reinforcing member 19 exceeds the protruding height H of the standing wall portion 16. Alternatively, the thickness T of the bonding reinforcing member 19 may coincide with the protruding height H of the standing wall portion 16. According to such a configuration, the bonding between the heat transfer tube 10 and the header 11 can be reliably reinforced by the bonding reinforcing member 19. However, the thickness T of the bonding reinforcing member 19 may be less than the protruding height H of the standing wall portion 16.

  Next, a method for manufacturing the heat exchanger 100 shown in FIGS. 1 and 2 will be described with reference to FIG.

  First, the heat transfer tube 10 and the header 11 are prepared.

  The heat transfer tube 10 is made of, for example, resin. When the heat transfer tube 10 is formed of resin, the weight of the heat exchanger 100 can be reduced. Moreover, if resin is used, the thin heat exchanger tube 10 can be manufactured at low cost. As the resin for the heat transfer tube 10, polypropylene, polyethylene, polyetheretherketone, fluororesin, or the like can be used. However, the material of the heat transfer tube 10 is not particularly limited. The heat transfer tube 10 may be formed of other materials such as metal. As the metal of the heat transfer tube 10, copper, iron, aluminum, titanium, stainless steel, or the like can be used.

  The structure of the header 11 is as described above. The header 11 (and 12) is typically formed of a metal such as stainless steel or aluminum. When the header 11 is made of metal, it is easy to ensure the rigidity and strength of the heat exchanger 100. As the metal of the header 11, copper, iron, aluminum, titanium, stainless steel, or the like can be used. However, the material of the header 11 is not particularly limited. The header 11 may be formed of other materials such as resin. If a resin is used, the header 11 can be easily and inexpensively manufactured by a resin molding method such as an injection molding method. As the resin for the header 11, polypropylene, polyethylene, polyetheretherketone, fluororesin, or the like can be used.

  Next, as shown in FIG. 3, the heat transfer tube 10 is fitted to each of the plurality of standing wall portions 16 in a positional relationship where the outer circumferential surface of the standing wall portion 16 is in contact with the inner circumferential surface of the heat transfer tube 10. In the present embodiment, the open end surface of the heat transfer tube 10 is in contact with the header 11 (specifically, the specific surface 15p). However, a gap may be formed between the opening end surface of the heat transfer tube 10 and the header 11. Since the standing wall portion 16 serves as a positioning pin, the heat transfer tube 10 can be easily and accurately attached to the header 11. When the heat transfer tube 10 is made of resin, the heat transfer tube 10 can be heated and expanded and inserted into the standing wall portion 16. When the heat transfer tube 10 and the header 11 are made of metal, a joining technique such as shrink fitting or cold fitting may be employed.

  Next, a material is disposed in the space between the adjacent standing wall portions 16. Thereby, the part (this embodiment reinforcement | strengthening reinforcement member 19) which contact | connects both the specific surface 15p of the header 11 and the outer peripheral surface of the some heat exchanger tube 10 is formed. For example, the molten resin can be supplied onto the specific surface 15p by a resin injection molding method to form the bonding reinforcing member 19. Specifically, the barrier 21 is disposed at a position facing the specific surface 15 p of the header 11. Thereby, a cavity 23 is formed between the barrier 21 and the header 11. The barrier 21 may be a mold (upper mold) used for performing injection molding. Depending on the distance between the barrier 21 and the header 11, the thickness T of the bonding reinforcing member 19 can be adjusted to a desired thickness. Another mold (lower mold) may be disposed on the side opposite to the side on which the standing wall portion 16 is formed, and the header 11 may be fixed to the other mold.

  Next, the cavity 23 is filled with the material of the bonding reinforcing member 19 and solidified. Thereby, the joint reinforcement member 19 is formed as a part which touches both the specific surface 15p of the main-body part 15 of the header 11, and the outer peripheral surface of the some heat exchanger tube 10. FIG. After forming the bonding reinforcement member 19, the barrier 21 is removed. The heat transfer tube 10 is fixed to the header 11 by the solidified resin. If it does in this way, the joint reinforcement member 19 can be formed easily. The heat transfer tube 10 can be securely fixed to the header 11. Polypropylene, polyethylene, polyetheretherketone, fluororesin, or the like can be used as the resin for the bonding reinforcing member 19.

  When the header 11 and the joint reinforcing member 19 are formed of the same resin, when the heat transfer tube 10 and the joint reinforcing member 19 are formed of the same resin, or when the heat transfer tube 10 and the header 11 and the joint reinforcing member 19 are formed. Are formed of the same resin, the effect of strengthening the bonding between the heat transfer tube 10 and the header 11 can be obtained more sufficiently.

  Moreover, it is not essential to finally remove the barrier 21. The barrier 21 may be a member that forms a part of the heat exchanger 100 (for example, a part of the bonding reinforcing member 19). That is, the resin filled in the cavity 23 and the barrier 21 may be integrated. In this case, the trouble of removing the barrier 21 can be saved. This method is particularly advantageous when the barrier 21 is formed of the same type of resin as that filled in the cavity 23.

  Further, the method for forming the joint reinforcing member 19 is not limited to the injection molding method. When forming the part (joining reinforcement member 19) which contact | connects both the specific surface 15p of the main-body part 15 of the header 11 and the outer peripheral surface of the some heat exchanger tube 10, the material which has fluidity between the adjacent standing wall parts 16 is used. Supply to space and solidify. In this way, it is possible to fill the space between the many standing wall portions 16 with no material. Therefore, all the heat transfer tubes 10 can be reliably joined to the header 11. The material having fluidity may be a resin or a metal.

  For example, when both the heat transfer tube 10 and the header 11 are made of metal, molten metal (for example, solder) is supplied to the space between the adjacent standing wall portions 16 and solidified. Thereby, the metal joining reinforcement member 19 can be formed. Alternatively, the work composed of the heat transfer tube 10 and the header 11 can be immersed in a molten metal bath to form the metal bonding strengthening member 19. Furthermore, after arrange | positioning a sheet-like preforming body on the specific surface 15p of the header 11, the joining reinforcement member 19 can be formed by melting and solidifying a preforming body. The material of the preform may be a resin or a metal such as solder that melts at a relatively low temperature.

  If the heat transfer tube 10 is joined to the second header 12 by the same method as described above, the heat exchanger 100 of the present embodiment is obtained.

  When many heat transfer tubes are used like a finless heat exchanger, joining a heat transfer tube and a header becomes a big subject. If several heat transfer tubes are joined to the header so that the ends of the heat transfer tubes are not crushed, a huge number of work steps are required to join several hundred to several thousand heat transfer tubes to the header.

  On the other hand, according to the method of the present embodiment, a large number of heat transfer tubes 10 can be integrated with the header 11 at the same time. Further, by joining the heat transfer tube 10 to the header 11 while hardening the periphery of the end portion of the heat transfer tube 10 with a third member such as the joint strengthening member 19, the heat transfer tube 10 and the header 11 are likely to have a problem of pressure resistance. Can be reinforced. As a result, the pressure resistance performance of the heat exchanger 100 can be improved.

  As described in Patent Document 2, in a method in which a heat transfer tube is inserted into a hole formed in a header and resin is injected to join the two, the end of the heat transfer tube is crushed by the pressure of the injected resin. Or the heat transfer tubes are likely to be clogged. If the end of the heat transfer tube is crushed or the heat transfer tube is clogged, the heat exchange capacity may vary, or the heat exchanger may be locally damaged and the fluid inside may leak. .

  In this embodiment, since the edge part of the heat exchanger tube 10 is fixed to the outer peripheral surface of the standing wall part 16, it can prevent that the edge part of the heat exchanger tube 10 is crushed by the inflow pressure of material. Moreover, since the standing wall 16 is located inside the end of the heat transfer tube 10, it is possible to prevent the material from directly flowing into the end of the heat transfer tube 10. That is, clogging of the heat transfer tube 10 can be prevented. As a result, the flow path inside the heat exchanger 100 is appropriately ensured, and a decrease in the heat exchange amount can be prevented. Furthermore, since the material can be injected with a reasonably high pressure, even if the number of heat transfer tubes 10 is increased, the material can be uniformly supplied to the entire surface of the specific surface 15p. Thereby, the joining strength of the heat exchanger tube 10 and the header 11 can be increased.

(Modification)
As shown in FIG. 4, in the heat exchanger 102 according to the modification, the heat transfer tube 10 has a tube expansion portion 10 k as an end portion fixed to the standing wall portion 16. The expanded tube portion 10k has an inner diameter that is larger than the inner diameter of the portion other than the expanded tube portion 10k. The outer diameter of the standing wall portion 16 is also enlarged according to the inner diameter of the expanded tube portion 10k. According to such a configuration, the pressure loss of the fluid flowing inside the heat exchanger 102 can be reduced. Further, the heat transfer tube 10 is easily joined by the header 11. In the present modification, the inner diameter of the standing wall portion 16 matches the inner diameter of the heat transfer tube 10 other than the expanded portion 10k. In other words, the flow passage cross-sectional area of the standing wall portion 16 is equal to the flow passage cross-sectional area of the heat transfer tube 10 other than the expanded pipe portion 10k. Since there is no step due to the opening end face of the standing wall portion 16, the pressure loss of the fluid flowing inside the heat exchanger 102 can be further reduced. The inner diameter of the heat transfer tube 10 other than the expanded portion 10k may be different from the inner diameter of the standing wall portion 16.

  In the heat transfer tube 10, a step 10t is formed between the expanded portion 10k and other portions. The opening end surface of the standing wall portion 16 is in contact with the step 10t. In the present modification, the length of the heat transfer tube 10 from the step 10 t to the opening end surface of the expanded tube portion 10 k is less than the thickness T of the bonding reinforcing member 19. In other words, the thickness T of the joint reinforcing member 19 exceeds the protruding height H of the standing wall portion 16. Alternatively, the thickness T of the bonding reinforcing member 19 may coincide with the protruding height H of the standing wall portion 16. According to such a configuration, the bonding between the heat transfer tube 10 and the header 11 can be reliably reinforced by the bonding reinforcing member 19.

  In the other modification shown in FIG. 5, the protruding height H of the standing wall portion 16 from the specific surface 15p of the header 11 is the length of the heat transfer tube 10 from the opening end surface of the expanded tube portion 10k to the step 10t (that is, the length of )). The opening end surface of the standing wall portion 16 is in contact with the step 10 t, and the opening end surface of the pipe expanding portion 10 k is separated from the specific surface 15 p of the header 11. According to such a configuration, a part of the joint strengthening member 19 can be bitten between the opening end face of the pipe expanding portion 10k and the specific face 15p of the header 11. As a result, the bonding between the heat transfer tube 10 and the header 11 can be further strengthened by the bonding reinforcing member 19.

  The manufacturing method of the heat exchanger 102 shown in FIG. 4 will be described with reference to FIG. The manufacturing method of the heat exchanger 102 shown in FIG. 4 is basically the same as the manufacturing method of the heat exchanger 100 shown in FIGS.

  As shown in FIG. 6, in this modified example, the barrier 21 is in contact with the step originating from the tube expansion portion 10 k, and thereby the position of the barrier 21 with respect to the header 11 is determined. The heat transfer tube 10 can be reliably fixed to the header 11 by pressing the heat transfer tube 10 toward the header 11 with the barrier 21 by using the level difference derived from the expanded tube portion 10k. Therefore, it is possible to suppress variations in strength at the joint portion between the heat transfer tube 10 and the header 11 and reliably satisfy the required pressure resistance performance.

(Other)
The heat transfer tube 10 and the header 11 (and / or the header 12) may be formed of the same material. It is desirable that the joint reinforcing member 19 be formed of the same material as the heat transfer tube 10 and the header 11. Of course, the joining reinforcement member 19 may be formed of a material different from that of the heat transfer tube 10 and the header 11.

  The technique disclosed in this specification is useful for a heat exchanger used in an air conditioner or the like. In addition, the technology disclosed in this specification can be applied not only to finless heat exchangers but also to other types of heat exchangers such as fin-and-tube heat exchangers.

10 Heat Transfer Tube 10k Expanded Tube Part 10t Step 11 First Header (Upper Header)
12 Second header (lower header)
13 Fluid introduction port 14 Fluid discharge port 15 Body portion 15p Specific surface 16 Standing wall portion 17 Internal space 19 Bonding reinforcement member 21 Barrier 23 Cavity 100, 102 Heat exchanger

Claims (11)

A plurality of heat transfer tubes each forming a fluid flow path;
End portions of the plurality of heat transfer tubes are fixed, a header having at least one of a function of distributing the fluid to the plurality of heat transfer tubes and a function of collecting the fluid from the plurality of heat transfer tubes;
A heat exchanger comprising:
The header has a main body portion having an internal space as a flow path for the fluid, and a plurality of cylindrical standing wall portions that protrude from a specific surface of the main body portion and communicate with the internal space. The heat transfer tube is joined to each of the plurality of standing wall portions in a positional relationship where the outer circumferential surface of the standing wall portion is in contact with the inner circumferential surface of the heat transfer tube,
The heat exchanger is provided between the adjacent standing wall portions, and is in close contact with both the specific surface of the main body portion and an outer peripheral surface of the plurality of heat transfer tubes, and the heat transfer tubes and the header. The heat exchanger further provided with the joining reinforcement | strengthening member which is strengthening joining.   The heat exchanger according to claim 1, wherein the heat transfer tube has a tube expansion portion as the end portion fixed to the standing wall portion. When the thickness of the joint reinforcing member is defined by the dimension related to the protruding direction of the standing wall portion from the specific surface,
3. The heat according to claim 2, wherein a length of the heat transfer tube from a step formed at a boundary between the tube expansion portion and the other portion to an opening end surface of the tube expansion portion is less than a thickness of the bonding reinforcement member. Exchanger. The protruding height of the standing wall from the specific surface exceeds the length of the heat transfer tube from the step formed at the boundary between the expanded portion and the other portion to the open end surface of the expanded portion,
4. The heat exchanger according to claim 2, wherein an opening end surface of the standing wall portion is in contact with the step, and an opening end surface of the pipe expansion portion is separated from the specific surface of the header.   The heat exchanger according to any one of claims 1 to 4, wherein the header is provided on both sides of the plurality of heat transfer tubes.   The heat exchanger according to any one of claims 1 to 5, wherein the heat transfer tube is formed of a resin.   The heat exchanger according to any one of claims 1 to 6, wherein the header is made of metal.   The heat exchanger according to any one of claims 1 to 7, wherein an outer diameter of the heat transfer tube is in a range of 0.1 to 1.0 mm. A plurality of heat transfer tubes each forming a fluid flow path;
End portions of the plurality of heat transfer tubes are fixed, a header having at least one of a function of distributing the fluid to the plurality of heat transfer tubes and a function of collecting the fluid from the plurality of heat transfer tubes;
A method of manufacturing a heat exchanger comprising:
The header has a main body portion having an internal space as a flow path for the fluid, and a plurality of cylindrical standing wall portions that protrude from a specific surface of the main body portion and communicate with the internal space. And
The manufacturing method includes:
Fitting the heat transfer tube to each of the plurality of standing wall portions in a positional relationship where the outer circumferential surface of the standing wall portion is in contact with the inner circumferential surface of the heat transfer tube;
Arranging a material in a space between the adjacent standing wall portions, forming a portion in contact with both the specific surface of the main body portion and the outer peripheral surfaces of the plurality of heat transfer tubes;
A method for manufacturing a heat exchanger, comprising:   When forming the portion in contact with both the specific surface of the main body and the outer peripheral surfaces of the plurality of heat transfer tubes, the material having fluidity is supplied to the space between the adjacent standing wall portions and solidified. The manufacturing method of the heat exchanger of Claim 9. The manufacturing method further includes disposing a barrier at a position facing the specific surface of the header to form a cavity between the barrier and the header,
The heat according to claim 9 or 10, wherein the portion is in contact with both the specific surface of the main body and the outer peripheral surfaces of the plurality of heat transfer tubes by filling the cavity with the material and solidifying the cavity. Exchanger manufacturing method.

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