JP2013120008A

JP2013120008A - Heat exchanger

Info

Publication number: JP2013120008A
Application number: JP2011267951A
Authority: JP
Inventors: Kazuhiko Machida; 和彦町田; Yoshio Nishiyama; 吉継西山; Tomoaki Ando; 智朗安藤; Takahiro Oshiro; 崇裕大城; Akio Fukuda; 明雄福田
Original assignee: Panasonic Corp
Current assignee: Panasonic Corp
Priority date: 2011-12-07
Filing date: 2011-12-07
Publication date: 2013-06-17
Anticipated expiration: 2031-12-07
Also published as: JP5927414B2

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger, which is reduced in cost by adopting a stainless pipe cheaper than copper material as a water pipe while maintaining qualities of the heat exchanger such as manufacturability and endurance reliability.SOLUTION: The tubular heat exchanger includes a water pipe 2 through which water flows, and a refrigerant pipe 103 through which refrigerant flows, in which the refrigerant pipe 103 is disposed in the water pipe 2 to perform heat exchange between water and refrigerant. The water pipe 2 is composed of a copper pipe 4 connected to a water header 106, a stainless pipe 5, and a copper SUS joint 6 joining the copper pipe 4 to the stainless pipe 5. The copper SUS joint part 6 is provided by inserting an end of the stainless pipe 5 to a copper pipe diameter-extended portion 7 followed by bonding through a brazing filler metal 8. Accordingly, in the heat exchanger, leak of water from the heat exchanger is prevented while preventing increase in cost by using the stainless material cheaper than the copper material, and endurance reliability can be secured.

Description

本発明は、空調装置、給湯装置等の機器に用いられ、特にヒートポンプ式の給湯機等のように、水等の流体と冷媒等の二種の流体を熱交換させるための熱交換器に関するものである。 The present invention relates to a heat exchanger for exchanging heat between a fluid such as water and two kinds of fluids such as a refrigerant, such as a heat pump type hot water heater, etc., used in equipment such as an air conditioner and a hot water heater. It is.

従来、この種の熱交換器としては、水流路を構成する水管と、冷媒流路を構成する冷媒管とからなり、水流路を流れる水と冷媒流路を流れる冷媒とを熱交換する二重管式タイプの熱交換器が考案されている（例えば、特許文献１参照）。 Conventionally, this type of heat exchanger is composed of a water pipe that constitutes a water flow path and a refrigerant pipe that constitutes a refrigerant flow path, and is a dual type that exchanges heat between water flowing through the water flow path and refrigerant flowing through the refrigerant flow path. A pipe-type heat exchanger has been devised (see, for example, Patent Document 1).

図３、図４は、特許文献１に記載された従来の熱交換器を示すものである。
図３、４で示すように、この熱交換器１０１は二重管式の熱交換器であり、内部に冷媒流路１０２が形成された銅製の冷媒管１０３と、冷媒管１０３の外側に設けられ、冷媒管１０３との間に水流路１０４が形成された銅製の水管１０５とから構成され、本実施の形態の場合には冷媒管１０３が２本設けられている。そして、銅製の水管１０５の出入口は銅製の水用ヘッダ１０６からなっており、熱交換器１０１を構成する材料がすべて銅製であった。 3 and 4 show a conventional heat exchanger described in Patent Document 1. FIG.
As shown in FIGS. 3 and 4, the heat exchanger 101 is a double-pipe heat exchanger, and is provided outside the refrigerant pipe 103 and a copper refrigerant pipe 103 in which a refrigerant flow path 102 is formed. In this embodiment, two refrigerant pipes 103 are provided. The copper water pipe 105 includes a water flow path 104 formed between the refrigerant pipe 103 and the copper water pipe 105. And the entrance / exit of the copper water pipe 105 consists of the header 106 for copper, and all the materials which comprise the heat exchanger 101 were copper.

以上のように構成された熱交換器について、以下その動作を説明する。 The operation of the heat exchanger configured as described above will be described below.

熱交換器１０１は、冷媒管１０３と水管１０５の二重管により形成され、水と冷媒とを熱交換するため、冷媒管１０３が水との接触面積が大きくとれ、熱交換効率を向上させることできる。 The heat exchanger 101 is formed by a double pipe of the refrigerant pipe 103 and the water pipe 105, and exchanges heat between the water and the refrigerant. Therefore, the refrigerant pipe 103 can have a large contact area with water, thereby improving the heat exchange efficiency. it can.

熱交換器１０１は銅製の二重管式であるため、水管１０５の曲げ加工が容易にでき、且つ銅製の水用ヘッダ１０６と銅製の水管１０５の接合も銅ロウ付け接合が可能であるなど、製造しやすい構造であることが知られている。 Since the heat exchanger 101 is a copper double pipe type, the water pipe 105 can be easily bent, and the copper water header 106 and the copper water pipe 105 can be joined by copper brazing. It is known that the structure is easy to manufacture.

特開２００５−６９６２０号公報JP 2005-69620 A

しかしながら、従来の熱交換器は銅製の二重管式であるため製造しやすいが、近年顕著になってきている銅地金価格の高騰のため、熱交換器の原材料費に起因する製造コストが上昇し、商品原価が圧迫され、ひいては商品価格が高額になってしまうという課題を有していた。 However, the conventional heat exchanger is easy to manufacture because it is a copper double tube type, but due to the recent rise in the price of copper bullion, the manufacturing cost due to the raw material cost of the heat exchanger has increased. As a result, there was a problem that the cost of goods increased, and the cost of goods became high, resulting in an increase in the price of goods.

本発明は、上記従来の課題を解決するもので、熱交換器の製造性や耐久信頼性等の品質を維持しつつ、銅材料よりも安価なステンレス製の管を水管に採用することで、原材料高騰リスクを防ぎ、商品価格の上昇を抑えることができる熱交換器を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, while maintaining the quality such as manufacturability and durability reliability of the heat exchanger, by adopting a stainless steel pipe cheaper than the copper material for the water pipe, An object of the present invention is to provide a heat exchanger capable of preventing the risk of soaring raw materials and suppressing an increase in commodity prices.

上記従来の課題を解決するために、本発明の熱交換器は、内部に水が流れる水管と、内部に冷媒が流れる冷媒管と、前記水管内に前記冷媒管を配設して前記水と前記冷媒とを熱
交換し、前記水管にステンレス材を一部用いた熱交換器において、前記水管は、水用ヘッダと接続された銅管と、ステンレス管と、前記銅管と前記ステンレス管を接合する銅ＳＵＳ接合部を連接して構成されている。 In order to solve the above-described conventional problems, a heat exchanger according to the present invention includes a water pipe through which water flows, a refrigerant pipe through which refrigerant flows, and the refrigerant pipe disposed in the water pipe. In the heat exchanger that exchanges heat with the refrigerant and uses a part of stainless steel for the water pipe, the water pipe includes a copper pipe connected to a water header, a stainless pipe, the copper pipe, and the stainless pipe. The copper SUS joint part to join is connected and comprised.

この構成によって、銅材料よりも安価なＳＵＳ管を採用したので原材料費の上昇リスクを防ぎ、商品価格の上昇を抑制できる。 With this configuration, a SUS pipe that is less expensive than a copper material is used, so that the risk of rising raw material costs can be prevented and the increase in product prices can be suppressed.

また、拡径された銅管の内側にステンレス管を挿入接合してなる銅ＳＵＳ接合部から構成されている。 Moreover, it is comprised from the copper SUS junction part formed by inserting and joining a stainless steel pipe inside the expanded copper pipe.

この構成によって、銅ＳＵＳ接合部のＳＵＳ管側に隙間腐食が発生し貫通穴が開いたとしても、水管外側へ漏水することがないので不具合に至らず、正常運転を維持できる。 With this configuration, even when crevice corrosion occurs on the SUS pipe side of the copper SUS joint and a through hole is opened, water does not leak to the outside of the water pipe, so that no malfunction occurs and normal operation can be maintained.

また、冷媒を二酸化炭素としてヒートポンプ式給湯機に適用されている。 Moreover, it is applied to a heat pump type hot water heater using carbon dioxide as a refrigerant.

この構成によって、ヒートポンプ式給湯機用の水・冷媒熱交換器として用いた場合には、水と接触する銅材料を少なくしたので青水発生を低減できる。 With this configuration, when used as a water / refrigerant heat exchanger for a heat pump type hot water heater, the generation of blue water can be reduced because the amount of copper material in contact with water is reduced.

本発明の熱交換器は、水と冷媒とを熱交換する熱交換器において、原材料である銅材よりも安価で原材料の価格変動が小さいステンレス材を水管の一部に用いたので、原材料高騰リスクを抑え、商品価格の上昇を防止できる。さらに、拡径された銅管の内側にステンレス管を挿入して接合された銅ＳＵＳ接合部を有するので、内挿されたステンレス管に腐食による貫通孔が空いたとしても、熱交換器から漏水する心配がなく、耐久信頼性を確保した熱交換器を提供できる。 The heat exchanger of the present invention is a heat exchanger for exchanging heat between water and a refrigerant. Since a stainless material, which is cheaper than the raw material copper material and has a small price fluctuation of the raw material, is used as a part of the water pipe, the raw material price rises. Risks can be reduced and product prices can be prevented from rising. Furthermore, since it has a copper SUS joint part that is joined by inserting a stainless steel pipe inside the expanded copper pipe, even if the inserted stainless steel pipe has a through hole due to corrosion, water leaks from the heat exchanger. It is possible to provide a heat exchanger that ensures durability and reliability.

本発明の実施の形態１における熱交換器の外観図External view of the heat exchanger in Embodiment 1 of this invention 同実施の形態１における熱交換器の銅ＳＵＳ接合部の軸方向断面図Cross-sectional view in the axial direction of the copper SUS joint of the heat exchanger in the first embodiment 従来例を示す熱交換器の概略図Schematic diagram of conventional heat exchanger 従来例を示す熱交換器の二重管の軸方向断面図Axial sectional view of a double pipe of a heat exchanger showing a conventional example

第１の発明は、内部に水が流れる水管と、内部に冷媒が流れる冷媒管と、前記水管内に前記冷媒管を配設して前記水と前記冷媒とを熱交換し、前記水管にステンレス材を一部用いた熱交換器において、前記水管は、水用ヘッダと接続された銅管と、ステンレス管と、前記銅管と前記ステンレス管を接合する銅ＳＵＳ接合部を連接して構成されている。 According to a first aspect of the present invention, there is provided a water pipe through which water flows, a refrigerant pipe through which refrigerant flows, and the refrigerant pipe disposed in the water pipe to exchange heat between the water and the refrigerant, and the water pipe is made of stainless steel. In the heat exchanger using a part of the material, the water pipe is configured by connecting a copper pipe connected to a water header, a stainless steel pipe, and a copper SUS joint for joining the copper pipe and the stainless steel pipe. ing.

第２の発明は、第１の発明において、拡径された銅管の内側にステンレス管を挿入接合してなる銅ＳＵＳ接合部から構成されている。 2nd invention is comprised in the 1st invention from the copper SUS junction part formed by inserting and joining a stainless steel pipe inside the expanded copper pipe.

第３の発明は、第１から第２の発明のいずれか一つの発明において、冷媒を二酸化炭素としたものである。 According to a third invention, in any one of the first to second inventions, the refrigerant is carbon dioxide.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によってこの発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

（実施の形態１）
図１は、本発明の実施の形態１における熱交換器の外観図である。図２は、同実施の形態１における熱交換器の銅ＳＵＳ接合部の軸方向断面図である。 (Embodiment 1)
FIG. 1 is an external view of a heat exchanger according to Embodiment 1 of the present invention. FIG. 2 is an axial cross-sectional view of the copper SUS joint of the heat exchanger according to the first embodiment.

尚、従来の熱交換器１０１と同一構成については、同一符号を付して詳細な説明を省略する。 In addition, about the same structure as the conventional heat exchanger 101, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

この熱交換器１は、内部に水が流れる水管２と、内部に冷媒が流れる冷媒管１０３と、水管２内に冷媒管１０３を配設している二重管式熱交換器である。水管２は、銅製の水用ヘッダ１０６と接続された銅製の銅管４と、ステンレス製のステンレス管５と、銅管４とステンレス管５とを接合する銅ＳＵＳ接合部６を連接して成っている。銅ＳＵＳ接合部６は、銅管４を拡径してなる銅管拡径部７とステンレス管５の端部からなり、銅管拡径部７にステンレス管５の端部を挿入して、ロウ材８で接合された構成である。冷媒はヒートポンプ式給湯機に適用している二酸化炭素である。 The heat exchanger 1 is a double-tube heat exchanger in which a water pipe 2 through which water flows, a refrigerant pipe 103 through which refrigerant flows inside, and a refrigerant pipe 103 disposed in the water pipe 2 are disposed. The water pipe 2 is formed by connecting a copper copper pipe 4 connected to a copper water header 106, a stainless steel stainless steel pipe 5, and a copper SUS joint 6 that joins the copper pipe 4 and the stainless steel pipe 5. ing. The copper SUS joint portion 6 is composed of a copper tube expanded portion 7 formed by expanding the copper tube 4 and an end portion of the stainless tube 5. The end portion of the stainless tube 5 is inserted into the copper tube expanded portion 7, It is a structure joined by brazing material 8. The refrigerant is carbon dioxide applied to the heat pump type hot water heater.

熱交換器１は、冷媒管１０３と水管２の二重管により形成され、水と冷媒とを熱交換するものである。 The heat exchanger 1 is formed by a double pipe of the refrigerant pipe 103 and the water pipe 2 and exchanges heat between water and the refrigerant.

水管２は、原材料である銅材よりも安価で原材料の価格変動が小さいステンレス材を水管２の一部に用いたので、原材料高騰リスクを抑え、商品価格の上昇を防止できる。 Since the water pipe 2 is made of stainless steel, which is cheaper than the raw material copper and has a small price fluctuation of the raw material, as a part of the water pipe 2, the risk of the raw material rising can be suppressed and the commodity price can be prevented from rising.

水管２にステンレス管５を採用した時の課題として、ステンレス製のステンレス管５と銅製の水用ヘッダ１０６との直接接合は加工が難しく、必要以上に時間を要したり、接合不良に纏わる品質ロスが多くなり、量産向きでない。 When stainless steel pipe 5 is adopted as water pipe 2, direct joining of stainless steel stainless steel pipe 5 and copper water header 106 is difficult to process, requiring more time than necessary, or quality associated with poor joining Loss increases and is not suitable for mass production.

この対策として、ステンレス管５と水用ヘッダ１０６との途中に、銅管４を配置することで、水用ヘッダ１０６との接合は従来のロウ付け接合等の加工法が使用でき、量産性を維持できる。 As a countermeasure against this, by arranging the copper pipe 4 in the middle of the stainless steel pipe 5 and the water header 106, a conventional processing method such as brazing joining can be used for joining the water header 106, and mass productivity is improved. Can be maintained.

また、銅ＳＵＳ接合部６は、銅管拡径部７の内側にステンレス管５を挿入して接合された構造であるため、仮に銅ＳＵＳ接合部６のステンレス管側に腐食等が発生し貫通孔が開いたとしても、水管２の外側へ漏水することがない。 Moreover, since the copper SUS joint part 6 has a structure in which the stainless steel pipe 5 is inserted and joined inside the copper pipe enlarged diameter part 7, corrosion or the like occurs on the stainless steel pipe side of the copper SUS joint part 6 and penetrates. Even if the hole is opened, water does not leak to the outside of the water pipe 2.

また、水管２における水と接触する銅材料の面積を少なくしたので、ヒートポンプ式給湯機で、ごくまれに発生する「青水」の発生リスクが低減できる効果もある。 Moreover, since the area of the copper material in contact with water in the water pipe 2 is reduced, there is also an effect that the occurrence risk of “blue water” that occurs very rarely in the heat pump hot water heater can be reduced.

このように、本実施の形態１における熱交換器１は、内部に水が流れる水管２と前記水管内に前記冷媒管を配設して前記水と前記冷媒とを熱交換し、水管２は、水用ヘッダ１０６に接続された銅管４と、ステンレス管５と、銅管４とステンレス管５とを接合する銅ＳＵＳ接合部６を設けており、銅管４を拡径してなる銅管拡径部７とステンレス管５の端部からなり、銅管拡径部７にステンレス管５の端部を挿入して、ロウ材８で接合された銅ＳＵＳ接合部６を設けている。 As described above, the heat exchanger 1 according to Embodiment 1 includes the water pipe 2 in which water flows and the refrigerant pipe in the water pipe to exchange heat between the water and the refrigerant. The copper tube 4 connected to the water header 106, the stainless steel tube 5, and the copper SUS joint 6 that joins the copper tube 4 and the stainless steel tube 5 are provided. The end portion of the stainless tube 5 is formed by inserting the end portion of the stainless tube 5 into the copper tube expanded portion 7, and the copper SUS joint portion 6 joined by the brazing material 8 is provided.

よって、原材料である銅材よりも安価で価格変動が小さいステンレス材を用いているので、原材料高騰リスクを抑え、商品価格の上昇を防止でき、更に内挿されたステンレス管に腐食による貫通孔が空いたとしても、熱交換器から漏水する心配がなく、耐久信頼性を確保した熱交換器を提供できる。 Therefore, since stainless steel is used that is cheaper and less price-changing than copper, which is a raw material, the risk of rising raw materials can be suppressed, the product price can be prevented from rising, and the inserted stainless steel pipe has a through hole due to corrosion. Even if it is vacant, there is no risk of water leaking from the heat exchanger, and a heat exchanger that ensures durability and reliability can be provided.

尚、本発明の実施の形態１では、水管２内に配置する冷媒管１０３を２本としているが、１本またはそれ以上の本数としても、同様の作用効果を期待することができる。 In the first embodiment of the present invention, the number of refrigerant pipes 103 arranged in the water pipe 2 is two, but the same effect can be expected even when the number of the refrigerant pipes is one or more.

また、本発明の実施の形態１では、冷媒管１０３内を流通する冷媒を二酸化炭素としたが、ハイドロカーボン系やＨＦＣ系（Ｒ４１０Ａ等）の冷媒、あるいはこれらの代替冷媒としても、同様の作用効果を期待することができる。 Further, in Embodiment 1 of the present invention, the refrigerant circulating in the refrigerant pipe 103 is carbon dioxide. However, the same effect can be obtained by using a hydrocarbon or HFC (such as R410A) refrigerant or an alternative refrigerant thereof. The effect can be expected.

以上のように、本発明にかかる熱交換器は、ステンレス材を水管に用いて商品価格の上昇を防止し、且つ銅管とステンレス管の接合部の課題を解決したものであり、二酸化炭素を用いた超臨界ヒートポンプ式給湯機や、暖房用ブラインを加熱する超臨界ヒートポンプ装置、さらには、家庭用、業務用の空気調和機、あるいはヒートポンプによる乾燥機能を具備した洗濯乾燥機、穀物貯蔵倉庫等のヒートポンプ機器の他に、燃料電池等の熱交換用途にも適用できる。 As described above, the heat exchanger according to the present invention uses a stainless steel as a water pipe to prevent an increase in product price, and solves the problem of the joint between the copper pipe and the stainless pipe. Supercritical heat pump water heater used, supercritical heat pump device for heating brine for heating, air conditioner for home use and business use, washing dryer equipped with drying function by heat pump, grain storage warehouse, etc. In addition to the heat pump device, it can be applied to heat exchange applications such as fuel cells.

１熱交換器
２水管
１０３冷媒管
１０６水用ヘッダ
４銅管
５ステンレス管
６銅ＳＵＳ接合部
７銅管拡径部 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Water pipe 103 Refrigerant pipe 106 Water header 4 Copper pipe 5 Stainless steel pipe 6 Copper SUS joint part 7 Copper pipe diameter expansion part

Claims

内部に水が流れる水管と、内部に冷媒が流れる冷媒管と、前記水管内に前記冷媒管を配設して前記水と前記冷媒とを熱交換し、前記水管にステンレス材を一部用いた熱交換器において、前記水管は、水用ヘッダと接続された銅管と、ステンレス管と、前記銅管と前記ステンレス管とを接合する銅ＳＵＳ接合部を連接してなる熱交換器。 A water pipe through which water flows, a refrigerant pipe through which refrigerant flows inside, the refrigerant pipe disposed in the water pipe to exchange heat between the water and the refrigerant, and a part of stainless steel was used for the water pipe In the heat exchanger, the water pipe is a heat exchanger formed by connecting a copper pipe connected to a water header, a stainless steel pipe, and a copper SUS joint for joining the copper pipe and the stainless steel pipe.

拡径された銅管の内側にステンレス管を挿入接合してなる前記銅ＳＵＳ接合部を有する請求項１に記載の熱交換器。 2. The heat exchanger according to claim 1, wherein the copper SUS joint is formed by inserting and joining a stainless steel tube inside the expanded copper tube.

冷媒を二酸化炭素としてヒートポンプ式給湯機に適用した請求項１または２のいずれか一項に記載の熱交換器。 The heat exchanger as described in any one of Claim 1 or 2 applied to the heat pump type hot water heater as a refrigerant | coolant as a carbon dioxide.