JP2008164215A

JP2008164215A - Fluid heating device

Info

Publication number: JP2008164215A
Application number: JP2006354268A
Authority: JP
Inventors: Shigeru Iwanaga; 茂岩永
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2006-12-28
Filing date: 2006-12-28
Publication date: 2008-07-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid heating device improved in endurance reliability by promoting heat transferring and reducing attachment of contamination. <P>SOLUTION: This fluid heating device comprises a fluid channel 7 in which fluid flows, a heating means 12 disposed in opposition to a heat transferring portion 10 of the fluid flow channel 7, a flowing direction control body 8 for controlling the flowing direction of the fluid flow channel 7, and a contamination attachment preventing means 11 disposed between the heat transferring portion 10 and the flowing direction control body 8. The attachment of deposit separating out from the fluid in an area of a low flow rate is reduced, the flow and promotion of heat transfer can be kept for a long period, and the endurance reliability can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、流体を所定温度に加熱する流体加熱装置に関するものである。 The present invention relates to a fluid heating apparatus that heats a fluid to a predetermined temperature.

従来、この種の流体加熱装置は、流体通路の外側に発熱体を設け、流体通路には流速を早めて熱伝達を良くするため螺旋型の流路を形成している（例えば特許文献１参照）。 Conventionally, this type of fluid heating device is provided with a heating element outside the fluid passage, and a spiral passage is formed in the fluid passage in order to increase the flow rate and improve heat transfer (see, for example, Patent Document 1). ).

図５は、特許文献１に記載された従来の流体加熱装置を示すものである。図５に示すように、円筒状の基材パイプ１と外筒２からなる二重管構造をしている。この基材パイプ１の外面の一部にはヒータ部３が設けられ、基材パイプ１の内孔４には螺旋中子５が挿入されている。この構成において、流体としての水は基材パイプ１の内孔４を流れるもので、その際、水は基材パイプ１の内孔４に挿入された螺旋中子５のねじ山６に沿って流れ、ヒータ部３からの熱と熱交換して温水が吐出されるものである。
特開２００１−２７９７８６号公報 FIG. 5 shows a conventional fluid heating apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 5, a double pipe structure including a cylindrical base pipe 1 and an outer cylinder 2 is formed. A heater portion 3 is provided on a part of the outer surface of the base pipe 1, and a spiral core 5 is inserted into the inner hole 4 of the base pipe 1. In this configuration, water as a fluid flows through the inner hole 4 of the base pipe 1, and at this time, the water runs along the thread 6 of the spiral core 5 inserted into the inner hole 4 of the base pipe 1. The hot water is discharged by exchanging heat and heat from the heater 3.
JP 2001-279786 A

しかしながら、前記従来の構成では、伝熱促進を高めて伝熱面積を低減しコンパクト性を高める場合、流体としての水の中に溶解していたスケール成分が析出し易くなり、通路の詰りや汚れ付着による局所過熱など耐久信頼性が低下するという課題を有していた。 However, in the conventional configuration, when the heat transfer acceleration is increased to reduce the heat transfer area and increase the compactness, the scale component dissolved in the water as the fluid is likely to precipitate, and the passage is clogged or soiled. It had the subject that durability reliability fell, such as local overheating by adhesion.

本発明は、前記従来の課題を解決するもので、流体流路の伝熱部と流動方向規制体との間に汚れ防止手段を設けた構成とすることで、伝熱促進させるとともに汚れ付着を低減して耐久信頼性を高めた流体加熱装置を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and is configured to provide a dirt prevention means between the heat transfer section of the fluid flow path and the flow direction regulating body, thereby promoting heat transfer and adhering dirt. An object of the present invention is to provide a fluid heating device that is reduced and has improved durability and reliability.

前記従来の課題を解決するために、本発明の流体加熱装置は、流体が流動する流体流路と、前記流体流路の伝熱部に対向配置した加熱手段と、流体流路の流れ方向を規制する流動方向規制体と、前記伝熱部と前記流動方向規制体との間に設けた汚れ付着防止手段を備えたものである。 In order to solve the above-described conventional problems, a fluid heating apparatus according to the present invention includes a fluid flow path in which a fluid flows, a heating unit disposed opposite to a heat transfer portion of the fluid flow path, and a flow direction of the fluid flow path. A flow direction regulating body to be regulated, and a dirt adhesion preventing means provided between the heat transfer section and the flow direction regulating body are provided.

これによって、流速が遅い領域で流体中から析出した析出物の付着を低減して長期間にわたる流動および伝熱促進の維持がなされる。 As a result, adhesion of precipitates precipitated from the fluid in a region where the flow rate is low is reduced, and the flow and heat transfer promotion are maintained over a long period of time.

本発明の流体加熱装置は、流速が遅い領域で流体中から析出した析出物の付着を低減して長期間にわたる流動および伝熱促進の維持ができ、耐久信頼性を向上できる。 The fluid heating device of the present invention can reduce adhesion of precipitates precipitated from the fluid in a region where the flow velocity is low, can maintain flow and heat transfer promotion for a long period of time, and can improve durability reliability.

第１の発明は、流体が流動する流体流路と、前記流体流路の伝熱部に対向配置した加熱手段と、流体流路の流れ方向を規制する流動方向規制体と、前記伝熱部と前記流動方向規制体との間に設けた汚れ付着防止手段を備えたことにより、流速が遅い領域で流体中から析出した析出物の付着を低減して長期間にわたる流動および伝熱促進の維持ができ、耐久信頼性を向上できる。 The first invention includes a fluid flow path through which a fluid flows, a heating unit disposed opposite to a heat transfer section of the fluid flow path, a flow direction restricting body that regulates a flow direction of the fluid flow path, and the heat transfer section. And the flow direction restricting body are provided with a dirt adhesion preventing means to reduce adhesion of precipitates precipitated from the fluid in a region where the flow velocity is low, and to maintain flow and heat transfer promotion over a long period of time. Can improve durability and reliability.

第２の発明は、特に、第１の発明の汚れ付着防止手段を汚れ付着防止手段は汚れが固着しにくい防汚性を高めた防汚性体で形成したことにより、流路の流れ方向性を高めた伝熱
促進と析出物の付着低減との両立ができる。 The second aspect of the invention is particularly characterized in that the dirt adhesion preventing means of the first invention is formed of an antifouling body having an antifouling property in which dirt is less likely to adhere, so that the flow directionality of the flow path is improved. It is possible to achieve both the enhancement of heat transfer and the reduction of deposit adhesion.

第３の発明は、特に、第１〜２のいずれか１つの発明の汚れ付着防止手段を汚れ付着防止手段は流体の流動で遥動する柔軟性を備えた粘弾性体で形成したことにより、流れにより遥動することで付着した析出物を落して流し去って析出物の付着防止を一層向上でき、構成を簡略化できる。 According to the third invention, in particular, the dirt adhesion preventing means of any one of the first and second inventions is formed of a viscoelastic body having a flexibility that swings with the flow of fluid. It is possible to further improve the prevention of deposit adhesion by dropping and flushing the deposited deposit by swaying by the flow, and the configuration can be simplified.

第４の発明は、特に、第１の発明の汚れ付着防止手段を汚れ付着防止手段は流動方向規制体と流体流路の伝熱部との間に隙間を形成して淀み防止部としたことにより、伝熱部での低流速領域を大幅に低減して析出物の付着防止を一層向上できるとともに、構成の簡略化により低コスト化を促進できる。 In the fourth invention, in particular, the dirt adhesion preventing means of the first invention is formed as a stagnation prevention part by forming a gap between the flow direction regulating body and the heat transfer part of the fluid flow path. As a result, the low flow velocity region in the heat transfer section can be significantly reduced to further improve the adhesion of precipitates, and the cost can be reduced by simplifying the configuration.

第５の発明は、特に、第１〜４のいずれか１つの発明の流動方向規制体を流動方向規制体は中子状の断面積低減手段と前記断面積低減手段の外周側に設けたコイルバネ状の螺旋体で形成したことにより、加工性を高めた部材構成により生産性と低コスト化を向上できる。 The fifth aspect of the invention is particularly the flow direction restricting body according to any one of the first to fourth aspects, wherein the flow direction restricting body is a core-like cross-sectional area reducing means and a coil spring provided on the outer peripheral side of the cross-sectional area reducing means. By forming it with a helical body, productivity and cost reduction can be improved by a member configuration with improved workability.

第６の発明は、特に、第５の発明の螺旋体を螺旋体は断面積低減手段に係止する係止部を備えたことにより、螺旋体の確実な固定による信頼性の向上ができ、さらに構成の簡素化による生産性を一層向上できる。 In particular, the sixth invention is provided with a locking portion for locking the spiral body of the fifth invention to the cross-sectional area reducing means, so that the reliability of the spiral body can be improved by the reliable fixing of the spiral body. Simplification can further improve productivity.

第７の発明は、特に、第１〜６のいずれか１つの発明の流動方向規制体を流動方向規制体は流体流路の伝熱部に対する位置を変化させる可動手段を備えたことにより、付着した析出物を確実に落すので信頼性を向上でき、さらに析出物の付着防止を一層向上できる。 The seventh invention, in particular, adheres to the flow direction restricting body of any one of the first to sixth inventions by the fact that the flow direction restricting body has movable means for changing the position of the fluid flow path relative to the heat transfer section. Since the deposited precipitate is surely dropped, the reliability can be improved, and the prevention of deposit adhesion can be further improved.

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本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. Note that the present invention is not limited to the embodiments.

（実施の形態１）
図１は本発明の第１の実施の形態の流体加熱装置の構成を示す断面図である。 (Embodiment 1)
FIG. 1 is a cross-sectional view showing the configuration of the fluid heating apparatus according to the first embodiment of the present invention.

図１において、内部に流体が流動する流体流路７は流体流路７内の流れの流動方向を規制する流動方向規制体８を内蔵し、この流動方向規制体８は流体流路７の流れ方向の断面積を低減する断面積低減手段９の回りに螺旋状に流体の通路を形成している。この断面積低減手段９と流体流路７の内面である伝熱部１０との間に設けた隙間には汚れ付着防止手段１１を配置している。この汚れ付着防止手段１１の隙間方向の長さである高さＨは、流動方向規制体８の高さＨａよりも小さくしている。また、汚れ付着防止手段１１の流れ方向の長さである幅Ｗは、流動方向規制体８の幅Ｗａよりも小さくしている。 In FIG. 1, a fluid flow path 7 in which a fluid flows therein incorporates a flow direction regulating body 8 that regulates the flow direction of the flow in the fluid flow path 7, and the flow direction regulating body 8 is a flow in the fluid flow path 7. A fluid passage is spirally formed around the cross-sectional area reducing means 9 for reducing the cross-sectional area in the direction. A dirt adhesion preventing means 11 is disposed in a gap provided between the cross-sectional area reducing means 9 and the heat transfer section 10 which is the inner surface of the fluid flow path 7. The height H, which is the length of the dirt adhesion preventing means 11 in the gap direction, is smaller than the height Ha of the flow direction restricting body 8. The width W, which is the length in the flow direction of the dirt adhesion preventing means 11, is smaller than the width Wa of the flow direction restricting body 8.

流体流路７の外側には伝熱部１０に対向するように加熱手段１２を配置し、この加熱手段１２と流体流路７の伝熱部１０との間は熱伝導性の良い材料で形成した伝熱体１３を介して熱接続している。ここでは、加熱手段１２としてシーズヒータ１４を使用している。断面積低減手段９は径を小さくした端部９ａを支持体１５に挿入して支持したもので、支持体１５は継手１６と流体流路７とで固定し、支持体１５には流体が流動する開口１７を設けている。流体流路７の入口側の継手１６には入口側配管１８を接続し、流体流路７の出口側の継手１６には出口側配管１９を接続している。また、出口側配管１９には加熱昇温された流体の温度を検知する温度検知手段２０を備えている。さらに、加熱手段１２には異常温度過熱時にシーズヒータ１４への通電を遮断する温度過昇防止手段２１を配置している。温度過昇防止手段２１は検知した所定の温度に対してバイメタル等により電気接点が機械的に開成して通電を自動的に遮断するスイッチであり、加熱手段１２の壁面等に
熱的に接続している。このシーズヒータ１４と温度過昇防止手段２１は電気的に直列に接続して制御手段２２に接続されている。この制御手段２２には温度検知手段２０が接続され、検知した温度に応じてシーズヒータ１４への電気入力を制御している。 Heating means 12 is disposed outside the fluid flow path 7 so as to face the heat transfer section 10, and a material having good heat conductivity is formed between the heating means 12 and the heat transfer section 10 of the fluid flow path 7. The heat transfer is performed through the heat transfer body 13. Here, a sheathed heater 14 is used as the heating means 12. The cross-sectional area reducing means 9 is supported by inserting an end portion 9a having a reduced diameter into a support body 15. The support body 15 is fixed by a joint 16 and a fluid flow path 7, and fluid flows through the support body 15. An opening 17 is provided. An inlet side pipe 18 is connected to the joint 16 on the inlet side of the fluid flow path 7, and an outlet side pipe 19 is connected to the joint 16 on the outlet side of the fluid flow path 7. Further, the outlet side pipe 19 is provided with a temperature detecting means 20 for detecting the temperature of the heated fluid. Further, the heating means 12 is provided with an overtemperature preventing means 21 for cutting off the energization to the sheathed heater 14 when the abnormal temperature is overheated. The over-temperature prevention means 21 is a switch that mechanically opens an electrical contact by a bimetal or the like to a predetermined detected temperature and automatically cuts off the energization, and is thermally connected to the wall surface of the heating means 12. ing. The sheathed heater 14 and the overtemperature prevention means 21 are electrically connected in series and connected to the control means 22. A temperature detecting means 20 is connected to the control means 22 and controls an electrical input to the sheathed heater 14 according to the detected temperature.

以上のように構成された流体加熱装置について、以下その動作、作用を説明する。 About the fluid heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

まず、入口側配管１８から流体を矢印Ａのように流入させ、制御手段２２は加熱手段１２としてのシーズヒータ１４への通電を開始する。すると、流体流路７を流れる流体とシーズヒータ１４との間で熱交換が起こる。ここで、流体流路７を流れる流体は支持体１５の開口１７を通過して流動方向規制体８と断面積低減手段９により形成した流動する断面が環状部よりも小さい螺旋状の流路を流れる（矢印Ｂ）ので、高流速化による乱流化促進および旋回流れの攪拌作用により、熱伝達を高めた流れとなって流体流路７内の流速分布が安定化される。また、このように熱伝達を高めた流れとしても、流体流路７の伝熱部１０の近傍、なかでも流動方向規制体８の伝熱部１０の近傍は汚れ付着防止手段１１の幅Ｗが流動方向規制体８の幅Ｗａより小さくしているので、汚れ付着防止手段１１による伝熱部１０の伝熱面積の低減を最小限にして有効伝熱面積を大きくしている。 First, a fluid is caused to flow from the inlet side pipe 18 as indicated by an arrow A, and the control means 22 starts energizing the sheathed heater 14 as the heating means 12. Then, heat exchange occurs between the fluid flowing through the fluid flow path 7 and the sheathed heater 14. Here, the fluid flowing through the fluid flow path 7 passes through the opening 17 of the support 15 and passes through the spiral flow path having a flowing cross-section formed by the flow direction restricting body 8 and the cross-sectional area reducing means 9 smaller than the annular portion. Since it flows (arrow B), the flow velocity distribution in the fluid flow path 7 is stabilized due to the enhanced flow of heat due to the turbulent flow promotion by the high flow velocity and the stirring action of the swirl flow. Further, even in such a flow with enhanced heat transfer, the width W of the dirt adhesion preventing means 11 is in the vicinity of the heat transfer section 10 of the fluid flow path 7, particularly in the vicinity of the heat transfer section 10 of the flow direction restricting body 8. Since it is smaller than the width Wa of the flow direction restricting body 8, the effective heat transfer area is increased by minimizing the reduction of the heat transfer area of the heat transfer section 10 by the dirt adhesion preventing means 11.

このようにして加熱手段１２からの伝熱が促進されるとともに局所過熱を防止した安定加熱がなされ、局所過熱などの発生を防止することで流体中の不純物がスケールとして析出することが低減される。このようにして所定温度まで加熱された流体が出口側配管１９から流出される。 In this way, heat transfer from the heating means 12 is promoted and stable heating is performed to prevent local overheating, and by preventing the occurrence of local overheating and the like, precipitation of impurities in the fluid as scale is reduced. . In this way, the fluid heated to a predetermined temperature flows out from the outlet side pipe 19.

この際、出口側配管１９から流出される流体の温度は、温度検知手段２０から制御手段２２に信号が送られ、制御手段２２は温度検知手段２０からの温度信号に応じて温度過昇防止手段２１を介してシーズヒータ１４への供給電力をコントロールしながら、出口側配管１９から流出される流体の温度が所定温度になるように制御される。 At this time, the temperature of the fluid flowing out from the outlet side pipe 19 is sent from the temperature detection means 20 to the control means 22, and the control means 22 responds to the temperature signal from the temperature detection means 20 to prevent overheating. While controlling the power supplied to the sheathed heater 14 via 21, the temperature of the fluid flowing out from the outlet side pipe 19 is controlled to be a predetermined temperature.

もし、このとき流入口１３からの流体に供給異常が発生して、流体の供給が停止したりあるいは加熱開始の当初から流体が供給されない時など流体流路７内の加熱手段１２が空焼き状態となった場合、加熱手段１２は急速な温度上昇を発生するが、この異常過熱は伝熱体１３を介して流体流路７の外部に設けた温度過昇防止手段２１に検知され、温度過昇防止手段２１自体が異常温度により物理的に切断されて加熱手段１２への通電を遮断して安全を確保する。 At this time, if the fluid supply from the inlet 13 is abnormally supplied and the fluid supply is stopped or the fluid is not supplied from the beginning of heating, the heating means 12 in the fluid flow path 7 is in an baked state. In this case, the heating unit 12 generates a rapid temperature rise, but this abnormal overheating is detected by the overtemperature prevention unit 21 provided outside the fluid flow path 7 via the heat transfer body 13, and the overheating is detected. The ascending prevention means 21 itself is physically cut off by the abnormal temperature, and the energization to the heating means 12 is cut off to ensure safety.

このような流体加熱装置において、大能力化あるいは小型コンパクト化する場合で重要なのは加熱密度（シーズヒータなどの電気ヒータの場合はワット密度Ｗ／ｃｍ^２）を高めることであり、加熱により析出するスケール対策が過熱時の安全性確保とともに重要である。特に、水道水などの水を流体とする場合はスケール対策が大能力化あるいは小型コンパクト化のキーポイントの一つであり、局所過熱領域を小さくすること、流体中に溶解していた不純物の析出、析出したスケールが伝熱面に付着することによる熱抵抗の増大による伝熱部１０の過熱連鎖の防止が重要である。 In such a fluid heating device, it is important to increase the heating density (in the case of an electric heater such as a sheathed heater, watt density W / cm ² ) when the capacity is increased or the size is reduced. Countermeasures are important as well as ensuring safety during overheating. In particular, when water such as tap water is used as a fluid, scaling is one of the key points for increasing the capacity or reducing the size and compactness, reducing the local overheating area, and precipitating impurities dissolved in the fluid. In addition, it is important to prevent an overheating chain of the heat transfer section 10 due to an increase in thermal resistance due to the deposited scale adhering to the heat transfer surface.

ここでは、流体流路７において流動方向規制体８の伝熱部１０の近傍は汚れ付着防止手段１１の幅Ｗは流動方向規制体８の幅Ｗａより小さく、汚れ付着防止手段１１による伝熱部１０の伝熱面の低減を最小限にして有効伝熱面積を大きくし、伝熱効果の悪い部分を低減し局所過熱領域を小さくしている。さらに、汚れ付着防止手段１１の幅Ｗを小さくすることで、螺旋状の流路の断面積を大きくしてスケールが析出付着した場合でも通路の確保と通路抵抗の増加を抑え、流動および伝熱促進の維持を長期にわたり確保して信頼性を高めている。さらに、汚れ付着防止手段１１の隙間方向の長さである高さＨを流動方向規制体８の高さＨａよりも小さくすることにより、流動方向規制体８による流路内の流れを適
正化できるとともに確実に規制できる。 Here, in the fluid flow path 7, in the vicinity of the heat transfer section 10 of the flow direction regulating body 8, the width W of the dirt adhesion preventing means 11 is smaller than the width Wa of the flow direction regulating body 8, and the heat transfer section by the dirt adhesion preventing means 11. The effective heat transfer area is increased by minimizing the reduction of the heat transfer surface 10, the portion having a poor heat transfer effect is reduced, and the local overheating region is reduced. Further, by reducing the width W of the dirt adhesion preventing means 11, even when the scale is deposited and adhered by increasing the cross-sectional area of the spiral flow path, the passage is secured and the passage resistance is prevented from increasing, and the flow and heat transfer are reduced. The promotion is maintained over a long period to increase reliability. Furthermore, by making the height H, which is the length of the dirt adhesion preventing means 11 in the gap direction, smaller than the height Ha of the flow direction restricting body 8, the flow in the flow path by the flow direction restricting body 8 can be optimized. And you can be surely regulated.

また、汚れ付着防止手段１１をテフロン（登録商標）系樹脂などの汚れが付着しにくい材料で防汚性体２３を形成することにより、スケールなどの付着量を小さくでき、さらに汚れ付着防止手段１１の幅Ｗを大きくして流動方向規制体８による流路内の流れを確実にできるので、流路の流れ方向性を高めた伝熱促進と析出物の付着低減との両立ができる。また、汚れ付着防止手段１１を薄い樹脂や薄いゴムなど流体の流動で遥動するような柔軟性を備えた材料で粘弾性体２４を形成することにより、流れにより遥動することで付着した析出物を落して流し去って析出物の付着防止を一層向上でき、構成を簡略化できる。 Further, by forming the antifouling body 23 of the dirt adhesion preventing means 11 with a material such as Teflon (registered trademark) resin that does not easily adhere to dirt, the amount of adhesion of the scale and the like can be reduced, and further the dirt adhesion preventing means 11. Since the flow in the flow path by the flow direction restricting body 8 can be ensured by increasing the width W of the flow direction, it is possible to achieve both heat transfer enhancement with improved flow directionality of the flow path and reduced deposit adhesion. In addition, by forming the viscoelastic body 24 with a material having flexibility such that the dirt adhesion preventing means 11 is oscillated by the flow of fluid, such as thin resin or thin rubber, the deposit adhered by swaying by the flow. It is possible to further improve the prevention of deposit adherence by dropping the material, and the structure can be simplified.

さらに、汚れ付着防止手段１１を汚れが付着しにくい材料でかつ流体の流動で遥動するような柔軟性を備えた材料で形成することにより、析出物の付着防止を長期にわたり一層向上できる。 Furthermore, the deposit prevention means 11 can be further improved over a long period of time by forming the stain prevention means 11 with a material that does not easily adhere to dirt and has a flexibility that can be swung by the fluid flow.

以上のように、本実施の形態においては、流体が流動する流体流路７と、前記流体流路７の伝熱部１０に対向配置した加熱手段１２と、流体流路７の流れ方向を規制する流動方向規制体８と、前記伝熱部１０と前記流動方向規制体８との間に設けた汚れ付着防止手段１１を備えたことにより、流速が遅い領域で流体中から析出した析出物の付着を低減して長期間にわたる流動および伝熱促進の維持ができ、耐久信頼性を向上できる。 As described above, in the present embodiment, the fluid flow path 7 through which the fluid flows, the heating means 12 arranged to face the heat transfer section 10 of the fluid flow path 7, and the flow direction of the fluid flow path 7 are regulated. The flow direction restricting body 8 and the dirt adhesion preventing means 11 provided between the heat transfer section 10 and the flow direction restricting body 8 are provided. Adhesion can be reduced to maintain flow and heat transfer promotion over a long period of time, and durability reliability can be improved.

また、本実施の形態の汚れ付着防止手段１１は、汚れが固着しにくい防汚性を高めた防汚性体で形成したことにより、流路の流れ方向性を高めた伝熱促進と析出物の付着低減との両立ができる。 In addition, the dirt adhesion preventing means 11 of the present embodiment is formed of an antifouling body having an antifouling property that makes it difficult for dirt to adhere, thereby promoting heat transfer and deposits that improve the flow direction of the flow path. It is possible to achieve both reduction of adhesion.

また、本実施の形態の汚れ付着防止手段１１は、流体の流動で遥動する柔軟性を備えた粘弾性体で形成したことにより、流れにより遥動することで付着した析出物を落して流し去って析出物の付着防止を一層向上でき、構成を簡略化できる。 Further, the dirt adhesion preventing means 11 of the present embodiment is formed of a viscoelastic body having flexibility that swings with the flow of the fluid, so that the deposits that have been swung with the flow are dropped and washed away. The adhesion prevention of the deposit can be further improved and the configuration can be simplified.

（実施の形態２）
図２は本発明の第２の実施の形態の流体加熱装置の構成を示す断面図である。 (Embodiment 2)
FIG. 2 is a sectional view showing the configuration of the fluid heating apparatus according to the second embodiment of the present invention.

図２において、図１の実施の形態と同一部材、同一機能は同一符号を付し詳細な説明は省略し、異なるところを中心に説明する。 In FIG. 2, the same members and functions as those of the embodiment of FIG. 1 are denoted by the same reference numerals, detailed description thereof is omitted, and different points will be mainly described.

汚れ付着防止手段１１は、断面積低減手段９の回りに螺旋状に通路を形成する流動方向規制体８と流体流路７の伝熱部１０との間に隙間Ｓを設けて淀み防止部２５としている。流動方向規制体８での流体は、螺旋方向の流れ（図中矢印Ｂ）に加えて、隙間Ｓによる淀み防止部２５を貫流する流れ（図中矢印Ｃ）を発生させる。 The dirt adhesion preventing means 11 is provided with a gap S between the flow direction restricting body 8 that forms a spiral passage around the cross-sectional area reducing means 9 and the heat transfer section 10 of the fluid flow path 7 to prevent the stagnation prevention section 25. It is said. In addition to the flow in the spiral direction (arrow B in the figure), the fluid in the flow direction restricting body 8 generates a flow (arrow C in the figure) that flows through the stagnation prevention portion 25 due to the gap S.

以上のように構成した流体加熱装置について、以下動作、作用を説明する。 About the fluid heating apparatus comprised as mentioned above, operation | movement and an effect | action are demonstrated below.

流体流路７を流れる流体は前述のように流動方向規制体８と断面積低減手段９により形成した断面積を縮小した螺旋状の流路を主流として流れる（矢印Ｂ）ので、高流速化による乱流化促進および旋回流れの攪拌作用により、熱伝達を高めた流れとなって流体流路７内の流速分布が安定化される。また、このように熱伝達を高めた流れとしても、流体流路７の流動方向規制体８に臨む伝熱部１０の近傍は、汚れ付着防止手段１１として設けた隙間Ｓである淀み防止部２５を貫流する流れ（図中矢印Ｃ）が副流として発生する。 Since the fluid flowing in the fluid flow path 7 flows in the main flow (arrow B) having a reduced cross-sectional area formed by the flow direction restricting body 8 and the cross-sectional area reducing means 9 as described above (arrow B), Due to the turbulent flow promotion and the stirring action of the swirling flow, the flow is enhanced in heat transfer, and the flow velocity distribution in the fluid flow path 7 is stabilized. Further, even in such a flow with enhanced heat transfer, the vicinity of the heat transfer section 10 facing the flow direction restricting body 8 of the fluid flow path 7 is a stagnation prevention section 25 that is a gap S provided as the dirt adhesion preventing means 11. A flow (arrow C in the figure) that flows through the gas is generated as a secondary flow.

このため、汚れ付着防止手段１１による伝熱部１０の伝熱面積が全て活かされて有効伝熱面積を拡大できる。また、副流Ｃにより壁面近傍での流れの淀みを防止し、壁面温度の
低減あるいは過熱を防止して伝熱部での低流速領域を大幅に低減して析出物の付着防止を一層向上でき、伝熱部での低流速領域を大幅に低減して伝熱促進できる。さらに、隙間Ｓを汚れ付着防止手段１１とすることで、構成の簡略化により低コスト化を促進できる。 For this reason, the heat transfer area of the heat transfer part 10 by the dirt adhesion preventing means 11 is fully utilized, and the effective heat transfer area can be expanded. In addition, the side flow C prevents the stagnation of the flow in the vicinity of the wall surface, prevents the wall surface temperature from being reduced or overheated, and greatly reduces the low flow velocity region in the heat transfer section, thereby further improving the prevention of deposit adhesion. The heat transfer can be promoted by greatly reducing the low flow velocity region in the heat transfer section. Further, by using the gap S as the dirt adhesion preventing means 11, the cost can be reduced by simplifying the configuration.

図３は図２に示す流体加熱装置の流動方向規制体８の他の構成を示す断面図である。 FIG. 3 is a cross-sectional view showing another configuration of the flow direction restricting body 8 of the fluid heating apparatus shown in FIG.

図３において、流動方向規制体８を中子状の断面積低減手段９と断面積低減手段９の外周側に設けたコイルバネ状の螺旋体２６とを別部材で形成している。コイルバネ状の螺旋体２６は流れ方向の端部に屈曲させた係止部２８を設け、この係止部２８を断面積低減手段９に設けた窪み部２７に挿入して係止することで螺旋体２６を断面積低減手段９に固定している。 In FIG. 3, the flow direction restricting body 8 is formed of a core-like cross-sectional area reducing means 9 and a coil spring-like spiral body 26 provided on the outer peripheral side of the cross-sectional area reducing means 9 as separate members. The coil spring-like spiral body 26 is provided with a latching portion 28 bent at the end in the flow direction, and the latching portion 28 is inserted into the recess 27 provided in the cross-sectional area reducing means 9 and latched to thereby lock the spiral body 26. Is fixed to the cross-sectional area reducing means 9.

このように、流動方向規制体８を中子状の断面積低減手段９とこの断面積低減手段９の外周側に設けたコイルバネ状の螺旋体２６の別部材で形成することで、加工性を高めた構成にして生産性と低コスト化を向上できる。 In this way, the flow direction restricting body 8 is formed by separate members of the core-like cross-sectional area reducing means 9 and the coil spring-like spiral body 26 provided on the outer peripheral side of the cross-sectional area reducing means 9, thereby improving workability. This can improve productivity and cost reduction.

また、螺旋体２６に屈曲して形成した係止部２８を断面積低減手段９に設けた窪み部２７に挿入して係止することで、溶接などで固定方法した場合に懸念される耐食信頼性や加工性の低下を心配することなく、螺旋体２６の確実な固定による信頼性の向上ができ、さらに構成の簡素化による生産性を一層向上できる。 Further, the locking portion 28 formed by bending the helical body 26 is inserted into the recess 27 provided in the cross-sectional area reducing means 9 and locked, so that the corrosion resistance reliability which is a concern when fixing by welding or the like is concerned. Further, without worrying about deterioration of workability, the reliability can be improved by reliably fixing the helical body 26, and the productivity can be further improved by simplifying the configuration.

以上のように、本実施の形態においては請求項１記載の汚れ付着防止手段１１を流動方向規制体８と流体流路７の伝熱部１０との間に隙間を形成して淀み防止部２５としたことにより、伝熱部１０での低流速領域を大幅に低減して析出物の付着防止を一層向上できるとともに、構成の簡略化により低コスト化を促進できる。 As described above, in the present embodiment, the dirt adhesion preventing means 11 according to claim 1 forms a gap between the flow direction restricting body 8 and the heat transfer portion 10 of the fluid flow path 7 to prevent the stagnation prevention portion 25. As a result, the low flow velocity region in the heat transfer section 10 can be significantly reduced to further improve the prevention of deposit adhesion, and the cost can be reduced by simplifying the configuration.

また、本実施の形態の流動方向規制体８を中子状の断面積低減手段９と前記断面積低減手段９の外周側に設けたコイルバネ状の螺旋体２６で形成したことにより、加工性を高めた部材構成により生産性と低コスト化を向上できる。 Further, the flow direction restricting body 8 of the present embodiment is formed by the core-like cross-sectional area reducing means 9 and the coil spring-like spiral body 26 provided on the outer peripheral side of the cross-sectional area reducing means 9, thereby improving the workability. Productivity and cost reduction can be improved by the configuration of the members.

また、本実施の形態の螺旋体２６は、断面積低減手段９に係止する係止部２８を備えたことにより、螺旋体２６の確実な固定による信頼性の向上ができ、さらに構成の簡素化による生産性を一層向上できる。 In addition, the helical body 26 of the present embodiment includes the locking portion 28 that locks the cross-sectional area reducing means 9, so that the reliability can be improved by the reliable fixing of the helical body 26, and the configuration is simplified. Productivity can be further improved.

（実施の形態３）
図４は第３の実施の形態を示す流体加熱装置の構成を示す断面図である。 (Embodiment 3)
FIG. 4 is a cross-sectional view showing the configuration of the fluid heating apparatus showing the third embodiment.

図４において、流動方向規制体８を形成する断面積低減手段９の端部を延長した駆動軸２９には配管３０の外部に設けた可動手段３１を設けている。駆動軸２９と配管３０との間には流体が漏れないようにＯリングなどのシール部材３２を設けている。また、可動手段３１としてモータを使用して駆動軸２９を回転駆動する。 In FIG. 4, a movable means 31 provided outside a pipe 30 is provided on a drive shaft 29 in which an end of a cross-sectional area reducing means 9 that forms the flow direction restricting body 8 is extended. A seal member 32 such as an O-ring is provided between the drive shaft 29 and the pipe 30 so that fluid does not leak. Further, the drive shaft 29 is rotationally driven using a motor as the movable means 31.

加熱手段１２としてのシーズヒータ１４に通電し、流体流路７を流れる流体を加熱昇温させる。流体として水道水などの水を使用する場合は、水質によっては加熱動作に伴って水中に溶け込んでいたスケール成分が析出して伝熱部１０に付着することがある。スケール成分の析出付着は伝熱部１０の中でも温度の高い部分に現れ易くなる。出口側の温度上昇や流量低減あるいは一定の時間が経過した場合は、可動手段３１を運転させて駆動軸２９を回転駆動させ、流動方向規制体８を伝熱部１０に対してその位置を変化させる。 The sheathed heater 14 as the heating means 12 is energized, and the fluid flowing through the fluid flow path 7 is heated and heated. When water such as tap water is used as the fluid, depending on the water quality, the scale component dissolved in the water may be deposited along with the heating operation and may adhere to the heat transfer section 10. The deposition of scale components tends to appear in the heat transfer section 10 at a high temperature. When the temperature on the outlet side is reduced, the flow rate is reduced, or a certain time has elapsed, the movable means 31 is operated to rotate the drive shaft 29, and the position of the flow direction restricting body 8 is changed with respect to the heat transfer section 10. Let

伝熱部１０に対して流動方向規制体８を移動させることにより、伝熱部１０に付着していたスケールなどの汚れを落すことで伝熱抵抗の増大を抑えて熱交換能力を維持することができる。図４は流動方向規制体８と伝熱部１０との間に隙間Ｓが存在する例を示しているが、汚れ付着防止手段１１により流動方向規制体８と伝熱部１０とが接触している場合は、より確実なスケールなどの汚れを落すことができる。 By moving the flow direction restricting body 8 with respect to the heat transfer section 10, dirt such as a scale attached to the heat transfer section 10 is removed to suppress an increase in heat transfer resistance and maintain heat exchange capability. Can do. FIG. 4 shows an example in which a gap S exists between the flow direction restricting body 8 and the heat transfer section 10, but the flow direction restricting body 8 and the heat transfer section 10 come into contact with each other by the dirt adhesion preventing means 11. If so, you can remove dirt such as a more reliable scale.

また、付着していたスケール等の汚れを機械的に確実に落すことで信頼性を向上でき、スケールなどの汚れの成長を妨げることで析出物の付着防止を一層向上できる。 In addition, the reliability can be improved by mechanically removing the dirt such as the scale attached, and the prevention of deposits can be further improved by preventing the growth of the dirt such as the scale.

なお、駆動軸２９を回転駆動させて流動方向規制体８を駆動する例を示したが、ソレノイドなどにより駆動軸２９を軸方向に摺動させて流動方向規制体８を駆動させても良いのは言うまでもない。 Although the example in which the driving direction 29 is driven by rotating the driving shaft 29 has been described, the driving direction 29 may be driven by sliding the driving shaft 29 in the axial direction by a solenoid or the like. Needless to say.

以上のように、本実施の形態において、流動方向規制体８は流体流路７の伝熱部１０に対する位置を変化させる可動手段３１を備えたことにより、付着した析出物を確実に落すので信頼性を向上でき、さらに析出物の付着防止を一層向上できる。 As described above, in the present embodiment, the flow direction restricting body 8 includes the movable means 31 that changes the position of the fluid flow path 7 with respect to the heat transfer section 10, thereby reliably dropping the deposited precipitates. And the prevention of deposits can be further improved.

以上のように、本発明にかかる流体加熱装置は、流速が遅い領域で流体中から析出した析出物の付着を低減して長期間にわたる流動および伝熱促進の維持ができ、耐久信頼性を向上できるので、燃料電池システム、衛生洗浄装置、洗濯洗浄装置、食器洗浄装置などの熱交換器などに適用することができる。 As described above, the fluid heating device according to the present invention can reduce the adhesion of precipitates deposited in the fluid in a region where the flow velocity is low, and can maintain the flow and heat transfer promotion over a long period of time, improving the durability reliability. Therefore, it can be applied to a heat exchanger such as a fuel cell system, a sanitary washing device, a laundry washing device, and a dish washing device.

本発明の実施の形態１における流体加熱装置の断面図Sectional drawing of the fluid heating apparatus in Embodiment 1 of this invention 本発明の実施の形態２における流体加熱装置の断面図Sectional drawing of the fluid heating apparatus in Embodiment 2 of this invention 図２における流動方向規制体の他の構成の断面図Sectional drawing of the other structure of the flow direction control body in FIG. 本発明の実施の形態３における流体加熱装置の断面図Sectional drawing of the fluid heating apparatus in Embodiment 3 of this invention 従来の流体加熱装置の断面図Sectional view of a conventional fluid heating device

符号の説明Explanation of symbols

７流体流路
８流動方向規制体
９断面積低減手段
１０伝熱部
１１汚れ付着防止手段
１２加熱手段
１４シーズヒータ
２０温度検知手段
２１温度過昇防止手段
２３防汚性体
２４粘弾性体
２５淀み防止部
２６螺旋体
２８係止部
３１可動手段 DESCRIPTION OF SYMBOLS 7 Fluid flow path 8 Flow direction control body 9 Cross-sectional area reduction means 10 Heat-transfer part 11 Dirt adhesion prevention means 12 Heating means 14 Seeds heater 20 Temperature detection means 21 Overheat prevention means 23 Antifouling body 24 Viscoelastic body 25 Stagnation Prevention part 26 Spiral body 28 Locking part 31 Movable means

Claims

流体が流動する流体流路と、前記流体流路の伝熱部に対向配置した加熱手段と、流体流路の流れ方向を規制する流動方向規制体と、前記伝熱部と前記流動方向規制体との間に設けた汚れ付着防止手段を備えた流体加熱装置。 A fluid flow path through which a fluid flows; heating means disposed opposite to a heat transfer section of the fluid flow path; a flow direction regulating body that regulates a flow direction of the fluid flow path; and the heat transfer section and the flow direction regulating body. The fluid heating device provided with the dirt adhesion prevention means provided between the two.

汚れ付着防止手段は汚れが固着しにくい防汚性を高めた防汚性体で形成した請求項１に記載の流体加熱装置。 2. The fluid heating device according to claim 1, wherein the dirt adhesion preventing means is formed of an antifouling body having an antifouling property in which dirt is difficult to adhere.

汚れ付着防止手段は流体の流動で遥動する柔軟性を備えた粘弾性体で形成した請求項１または２に記載の流体加熱装置。 The fluid heating apparatus according to claim 1 or 2, wherein the dirt adhesion preventing means is formed of a viscoelastic body having flexibility that swings with a fluid flow.

汚れ付着防止手段は流動方向規制体と流体流路の伝熱部との間に隙間を形成して淀み防止部とした請求項１に記載の流体加熱装置。 2. The fluid heating apparatus according to claim 1, wherein the dirt adhesion preventing means is a stagnation prevention part by forming a gap between the flow direction restricting body and the heat transfer part of the fluid flow path.

流動方向規制体は中子状の断面積低減手段と前記断面積低減手段の外周側に設けたコイルバネ状の螺旋体で形成した請求項１〜４のいずれか１項に記載の流体加熱装置。 The fluid heating device according to any one of claims 1 to 4, wherein the flow direction restricting body is formed by a core-like cross-sectional area reducing unit and a coil spring-like spiral body provided on an outer peripheral side of the cross-sectional area reducing unit.

螺旋体は断面積低減手段に係止する係止部を備えた請求項５に記載の流体加熱装置。 The fluid heating apparatus according to claim 5, wherein the spiral body includes a locking portion that locks the cross-sectional area reducing unit.

流動方向規制体は流体流路の伝熱部に対する位置を変化させる可動手段を備えた請求項１〜６のいずれか１項に記載の流体加熱装置。 The fluid heating device according to any one of claims 1 to 6, wherein the flow direction restricting body includes movable means for changing a position of the fluid flow path with respect to the heat transfer section.