JPH11351559A - Heat exchanger - Google Patents
Heat exchangerInfo
- Publication number
- JPH11351559A JPH11351559A JP16505298A JP16505298A JPH11351559A JP H11351559 A JPH11351559 A JP H11351559A JP 16505298 A JP16505298 A JP 16505298A JP 16505298 A JP16505298 A JP 16505298A JP H11351559 A JPH11351559 A JP H11351559A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heat exchanger
- combustion
- burner
- heated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 66
- 239000000567 combustion gas Substances 0.000 claims abstract description 25
- 238000009833 condensation Methods 0.000 claims abstract description 22
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Regulation And Control Of Combustion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、バーナでの燃焼に
より生ずる燃焼ガスと被加熱流体との間の熱交換を行う
熱交換器を備える熱交換装置に関し、特にバーナでの燃
焼をオンオフ制御することにより被加熱流体の温度を制
御するものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a heat exchanger for exchanging heat between a combustion gas generated by combustion in a burner and a fluid to be heated, and more particularly, to on / off control of combustion in the burner. To control the temperature of the fluid to be heated.
【０００２】[0002]
【従来の技術】この種の熱交換装置としては、例えば被
加熱流体として送り込まれた室内空気を燃焼ガスとの間
で熱交換させて温風にして室内に吹き出し、室温が設定
室温になるように暖房を行うＦＦ式暖房器がある。この
ような暖房器のうち、燃料としてガスを用いるもので
は、バーナへ供給するガス量を調節して燃焼量を調節す
ることにより、室温を制御するものがある。2. Description of the Related Art As this type of heat exchange apparatus, for example, indoor air sent as a fluid to be heated is exchanged with combustion gas to generate hot air and blown out into the room, so that the room temperature becomes a set room temperature. There is an FF type heater that performs heating. Among such heaters, among heaters that use gas as fuel, there is a heater that controls room temperature by adjusting the amount of gas supplied to a burner and adjusting the amount of combustion.
【０００３】ところが、燃焼量をしぼり過ぎると、バー
ナでの燃焼が不安定になり立ち消え等が生ずるおそれが
ある。つまり燃焼量の調節できる範囲には下限がある。
従って、加熱量が少なくてよい場合は、燃焼量を下限値
にしてもなお燃焼量が大き過ぎ、室温が設定室温を超え
ることになる。このような場合に対応したものとして、
バーナでの燃焼をオンオフ制御するものがある。これに
よれば、燃焼量を下限値にしてもなお燃焼量が大き過ぎ
て室温が設定室温を超える場合は、バーナでの燃焼をオ
フさせることができるため、燃焼を断続的にオンオフさ
せることで室温を設定室温に維持した暖房を行うことが
できる。[0003] However, if the amount of combustion is excessively reduced, the combustion in the burner becomes unstable, and there is a possibility that the burn-out may occur. That is, there is a lower limit in the range in which the amount of combustion can be adjusted.
Therefore, when the heating amount is small, the combustion amount is still too large even if the combustion amount is set to the lower limit, and the room temperature exceeds the set room temperature. In response to such cases,
Some burners control on / off the combustion in the burner. According to this, when the combustion amount is still too large even if the combustion amount is set to the lower limit and the room temperature exceeds the set room temperature, the combustion in the burner can be turned off. Heating can be performed while maintaining the room temperature at the set room temperature.
【０００４】[0004]
【発明が解決しようとする課題】ところで、バーナでの
燃焼をオンオフ制御すると、燃焼をオフしている間は熱
交換器温度が低下する。熱交換器温度が燃焼ガスの露点
以下になると、次に燃焼をオンしたときに燃焼ガスが熱
交換器に触れて露点以下に冷却され、燃焼ガスに含まれ
る水分が熱交換器の壁面に結露していわゆるドレンが生
じ、ドレンに含まれる酸性成分により熱交換器を腐食さ
せるおそれがある。When the combustion in the burner is controlled to be on or off, the temperature of the heat exchanger decreases while the combustion is off. When the heat exchanger temperature falls below the dew point of the combustion gas, the next time the combustion is turned on, the combustion gas touches the heat exchanger and cools below the dew point, and the moisture contained in the combustion gas condenses on the wall of the heat exchanger. As a result, so-called drain is generated, and the acidic component contained in the drain may corrode the heat exchanger.
【０００５】本発明は、このような不具合を解決する熱
交換装置を提供することを課題とする。[0005] It is an object of the present invention to provide a heat exchange device that solves such a problem.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、バーナでの燃焼により生ずる燃焼ガスと
被加熱流体との間の熱交換を行う熱交換器と、被加熱流
体の温度を検出する被加熱流体温度検出手段と、当該被
加熱流体温度検出手段の検出温度が設定温度になるよう
にバーナでの燃焼をオンオフ制御する制御手段と、を備
える熱交換装置において、前記熱交換器の温度を検出す
る熱交換器温度検出手段を備え、前記制御手段により、
当該熱交換器温度検出手段の検出温度が結露防止温度以
下になると前記バーナでの燃焼をオンすることを特徴と
する。In order to solve the above-mentioned problems, the present invention provides a heat exchanger for exchanging heat between a combustion gas generated by combustion in a burner and a fluid to be heated, and a temperature of the fluid to be heated. A temperature of the fluid to be heated, and control means for on / off control of combustion in the burner so that the temperature detected by the temperature of the fluid to be heated reaches a set temperature. Heat exchanger temperature detection means for detecting the temperature of the vessel, by the control means,
When the temperature detected by the heat exchanger temperature detecting means becomes equal to or lower than the dew condensation preventing temperature, the combustion in the burner is turned on.
【０００７】このような熱交換装置によれば、熱交換器
の温度が常に結露防止温度以上に維持される。従って、
例えば結露防止温度を燃焼ガスの露点に設定しておけ
ば、熱交換器の温度が常に露点以上の温度に維持され、
燃焼ガスに含まれる水分が熱交換器に結露することがな
い。According to such a heat exchanger, the temperature of the heat exchanger is always maintained at a temperature equal to or higher than the dew condensation preventing temperature. Therefore,
For example, if the dew condensation prevention temperature is set to the dew point of the combustion gas, the temperature of the heat exchanger is always maintained at a temperature equal to or higher than the dew point,
Moisture contained in the combustion gas does not condense on the heat exchanger.
【０００８】ところで、熱交換器温度が結露防止温度以
下であることを検出したときに熱交換器温度維持のため
にバーナでの燃焼をオンすると、被加熱流体温度が上昇
するため、被加熱流体温度を設定温度に保つ制御上好ま
しくない。従って、前記制御手段によって、前記熱交換
器温度検出手段の検出温度が結露防止温度以下になった
ことによりオンになった前記バーナでの燃焼を、前記熱
交換器温度検出手段の検出温度が前記結露防止温度を超
えた所定温度より高くなるとオフする。このようにすれ
ば、熱交換器での結露発生を防止しながら被加熱流体の
温度上昇を最小限に抑えることができる。When the combustion in the burner is turned on to maintain the temperature of the heat exchanger when it is detected that the temperature of the heat exchanger is lower than the dew condensation preventing temperature, the temperature of the fluid to be heated rises. This is not preferable for controlling the temperature at the set temperature. Therefore, by the control means, the combustion in the burner turned on when the detected temperature of the heat exchanger temperature detecting means has become equal to or lower than the dew condensation preventing temperature, the detected temperature of the heat exchanger temperature detecting means Turns off when the temperature rises above a predetermined temperature exceeding the dew condensation prevention temperature. With this configuration, it is possible to minimize the temperature rise of the fluid to be heated while preventing the occurrence of dew condensation in the heat exchanger.
【０００９】また、被加熱流体が室内空気であり、熱交
換装置が室内空気を強制的に送風する送風手段を備える
暖房機である場合は、熱交換器温度検出手段の検出温度
が結露防止温度以下になってバーナでの燃焼をオンさせ
たときに、送風手段は停止状態であるのが好ましい。こ
のようにすれば、新たな室内空気が熱交換器に供給され
て燃焼ガスとの間で熱交換されないので、バーナでの燃
焼により室温が上昇することがなく、熱交換器のみが加
熱されて短時間で露点以上の所定温度に温度上昇させる
ことができ結露が防止される。In the case where the fluid to be heated is room air and the heat exchange device is a heater provided with a blower for forcibly blowing room air, the temperature detected by the heat exchanger temperature detector is equal to the dew condensation prevention temperature. When the combustion in the burner is turned on as described below, it is preferable that the blower is in a stopped state. In this way, new room air is supplied to the heat exchanger and is not exchanged with the combustion gas, so that the room temperature does not rise due to combustion in the burner, and only the heat exchanger is heated. The temperature can be raised to a predetermined temperature higher than the dew point in a short time, thereby preventing dew condensation.
【００１０】[0010]
【発明の実施の形態】図１を参照して１は熱交換装置の
一形態であるＦＦ式の暖房機であり、暖房機の匡体１ａ
内には、室内空気（被加熱流体）を匡体１ａ内に送通さ
せる送風手段としての対流ファン２と、燃料であるガス
を燃焼させるバーナ３が内部に設置された燃焼室４と、
該燃焼室４におけるバーナ３での燃料ガスの燃焼により
得られる燃焼ガスが送り込まれる熱交換器５とが設置さ
れている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes an FF type heater as an embodiment of a heat exchanger, and a housing 1a of the heater.
Inside, a convection fan 2 as a blowing means for passing indoor air (fluid to be heated) into the housing 1a, a combustion chamber 4 in which a burner 3 for burning gas as a fuel is installed,
A heat exchanger 5 into which the combustion gas obtained by burning the fuel gas in the burner 3 in the combustion chamber 4 is provided.
【００１１】対流ファン２は匡体１ａの側部に取り付け
た第１モータ２ａにより作動される。対流ファン２を作
動させると室内空気が匡体１ａの吸気口１ｂから吸い込
まれて匡体１ａの吹出口１ｃから吹き出される。第１モ
ータ２ａの回転等は暖房機１の制御手段としてのコント
ローラ６により制御される。The convection fan 2 is operated by a first motor 2a mounted on the side of the housing 1a. When the convection fan 2 is operated, room air is sucked in from the air inlet 1b of the housing 1a and blown out from the outlet 1c of the housing 1a. The rotation and the like of the first motor 2a are controlled by a controller 6 as control means of the heater 1.
【００１２】吸気口１ｂに隣接する位置には、吸気口１
ｂから吸い込んだ室内空気の温度を検出する室温センサ
（被加熱流体温度検出手段）７が取り付けられている。
室温センサ７で検出した室内温度を示す温度信号はコン
トローラ６に入力される。なお吸気口１ｂにはフィルタ
８が装着されている。また吹出口１ｃには吹出方向を方
向付けするためのブレード９が複数枚取り付けられてい
る。各ブレード９，…は図示しない平行リンクにより相
互に連結されており常に同一方向に向けられる。At a position adjacent to the intake port 1b, the intake port 1
A room temperature sensor (heated fluid temperature detecting means) 7 for detecting the temperature of the room air sucked from b.
A temperature signal indicating the room temperature detected by the room temperature sensor 7 is input to the controller 6. Note that a filter 8 is attached to the intake port 1b. Further, a plurality of blades 9 for directing the blowing direction are attached to the outlet 1c. The blades 9,... Are interconnected by parallel links (not shown) and are always directed in the same direction.
【００１３】燃焼室４には燃焼用空気の吸入口４ａ及び
燃焼ガスの送出口４ｂが形成されている。吸入口４ａに
は室外に連通する吸気管１０が接続されており、吸気管
１０内には燃焼用空気を燃焼室に強制的に供給する給気
ファン１１が設置されている。該給気ファン１１はコン
トローラ６により制御される第２モータ１１ａで駆動さ
れる。他方、送出口４ｂには熱交換器５が接続されてい
る。またバーナ３にはガス供給管１３が配設されてい
る。ガス供給管１３には開度調整可能な比例電磁弁１４
ａと、その上流側の開閉電磁弁１４ｂとが取り付けられ
ている。なお、比例電磁弁１４ａの開度調整及び開閉電
磁弁１４ｂの開弁、閉弁はコントローラ６によって制御
される。The combustion chamber 4 has a combustion air inlet 4a and a combustion gas outlet 4b. An intake pipe 10 communicating with the outside of the room is connected to the intake port 4a, and an air supply fan 11 for forcibly supplying combustion air to the combustion chamber is installed in the intake pipe 10. The air supply fan 11 is driven by a second motor 11a controlled by the controller 6. On the other hand, the heat exchanger 5 is connected to the outlet 4b. The burner 3 is provided with a gas supply pipe 13. The gas supply pipe 13 has a proportional solenoid valve 14 whose opening can be adjusted.
a and an opening / closing solenoid valve 14b on the upstream side thereof are attached. The controller 6 controls the opening of the proportional solenoid valve 14a and the opening and closing of the on-off solenoid valve 14b.
【００１４】また燃焼室４内にはコントローラ６により
動作制御される点火プラグ１５と、燃焼状態を検出する
炎検知器１６が取り付けられている。炎検知器１６の検
知信号はコントローラ６に入力されている。A spark plug 15 whose operation is controlled by a controller 6 and a flame detector 16 for detecting a combustion state are mounted in the combustion chamber 4. The detection signal of the flame detector 16 is input to the controller 6.
【００１５】熱交換器５は、燃焼室４からの燃焼ガスの
入口５ａ及び出口５ｂを備える。入口５ａは燃焼室４の
送出口４ｂに接続され、出口５ｂには室外に通ずる排気
管１７が接続されている。また熱交換器５には、熱交換
器の壁面温度を検出する熱交温度センサ（熱交換器温度
検出手段）１８が取り付けられている。熱交温度センサ
１８で検出された温度は温度信号としてコントローラ６
に入力される。The heat exchanger 5 has an inlet 5a and an outlet 5b for the combustion gas from the combustion chamber 4. The inlet 5a is connected to a delivery port 4b of the combustion chamber 4, and the outlet 5b is connected to an exhaust pipe 17 communicating with the outside of the chamber. Further, the heat exchanger 5 is provided with a heat exchange temperature sensor (heat exchanger temperature detecting means) 18 for detecting the wall surface temperature of the heat exchanger. The temperature detected by the heat exchange temperature sensor 18 is used as a temperature signal by the controller 6.
Is input to
【００１６】またコントローラ６には室温等を設定する
ための操作パネル６ａが備えられている。コントローラ
６は、室温センサ７で検出した室温が操作パネル６ａで
設定された設定室温になるように、給気ファン１１の回
転数を制御して燃焼空気量を制御すると共に比例電磁弁
１４ａの開度調節を行って燃料ガスの供給量を調節しバ
ーナ３での燃焼量を可変制御する。そして、比例電磁弁
１４ａの開度を下限燃焼量にしても室温が設定温度を超
えて上昇する場合は、開閉電磁弁１４ｂを開閉させてバ
ーナ３での燃焼をオンオフ（ＯＮ−ＯＦＦ）制御し、バ
ーナを断続燃焼させて、室温が設定温度になるように燃
焼を制御する。以下、暖房機１の動作を図２に示すフロ
ーチャートを用いて説明する。The controller 6 has an operation panel 6a for setting the room temperature and the like. The controller 6 controls the rotation speed of the air supply fan 11 to control the amount of combustion air and to open the proportional solenoid valve 14a so that the room temperature detected by the room temperature sensor 7 becomes the set room temperature set on the operation panel 6a. The burner 3 is variably controlled by controlling the degree of fuel gas supply by adjusting the degree of combustion. If the room temperature rises above the set temperature even when the opening degree of the proportional solenoid valve 14a is set to the lower limit combustion amount, the opening / closing solenoid valve 14b is opened and closed to control the combustion in the burner 3 on / off (ON-OFF). Then, the burner is intermittently burned to control the combustion so that the room temperature becomes the set temperature. Hereinafter, the operation of the heater 1 will be described with reference to the flowchart shown in FIG.
【００１７】暖房機の運転スイッチがオン（ＯＮ）され
ると（Ｓ１）、バーナでの燃焼がオンされる（Ｓ２）。
具体的には、開閉電磁弁が開弁され、給気ファンがオン
されて回転され、点火プラグにスパークを発生させて燃
焼を開始させる。続いて対流ファンがオンされ（Ｓ
３）、温風が室内に吹き出されて室内が暖房される。暖
房中は、室温センサ７の検出温度（室温）が設定室温と
等しくなるように、比例電磁弁１４ａの開度が調節され
て燃焼量が調節されるが、比例電磁弁１４ａの開度を最
小にした状態で暖房を続けたときに室温が設定室温に１
℃加えた温度よりも高くなる（Ｓ４での判断が「ＹＥ
Ｓ」になる）と、バーナでの燃焼がオフ（ＯＦＦ）され
る（Ｓ５）。具体的には、開閉電磁弁１４ｂが閉弁され
ると共に給気ファンがオフされる。続いて対流ファンが
オフされる（Ｓ６）。When the operation switch of the heater is turned on (S1) (S1), the combustion in the burner is turned on (S2).
Specifically, the open / close electromagnetic valve is opened, the air supply fan is turned on and rotated, and a spark is generated in the spark plug to start combustion. Subsequently, the convection fan is turned on (S
3) The warm air is blown into the room to heat the room. During heating, the amount of combustion is adjusted by adjusting the opening of the proportional solenoid valve 14a so that the detected temperature (room temperature) of the room temperature sensor 7 becomes equal to the set room temperature. The room temperature is set to 1
° C higher than the temperature added (the judgment in S4 is “YE
S "), the combustion in the burner is turned off (S5). Specifically, the opening / closing solenoid valve 14b is closed and the air supply fan is turned off. Subsequently, the convection fan is turned off (S6).
【００１８】この後、室温が設定室温以下（Ｓ７で「Ｎ
Ｏ」）になれば、再びバーナをオンし（Ｓ２）、比例電
磁弁１４ａの開度調節を行ってバーナ３での燃焼量を可
変制御することにより暖房を行うが、室温が設定室温よ
り高い（Ｓ７で「ＹＥＳ」）場合は、熱交換器５の温度
を検出する（Ｓ８）。ここで熱交換器５の温度が結露防
止温度として設定した露点より高い（Ｓ８で「ＮＯ」）
場合は、再び室温が設定室温以下であるか否かを判断す
る（Ｓ７）。他方、熱交換器５の検出温度が露点以下
（Ｓ８で「ＹＥＳ」）であればバーナ３での燃焼をオン
し（Ｓ９）、その後、予め定めた条件に従ってバーナ３
での燃焼をオフする。本実施形態では熱交換器５の温度
が露点に１０℃加えた温度（所定温度）より高くなる
（Ｓ１０で「ＹＥＳ」になる）と、バーナ３での燃焼を
オフする（Ｓ１１）。バーナ３での燃焼をオフすると、
再び室温が設定室温以下になっているか否かを判断する
（Ｓ７）。Thereafter, the room temperature is equal to or lower than the set room temperature ("N" in S7).
O "), the burner is turned on again (S2), the proportional solenoid valve 14a is opened to adjust the opening, and the amount of combustion in the burner 3 is variably controlled to perform heating, but the room temperature is higher than the set room temperature. If "YES" in S7, the temperature of the heat exchanger 5 is detected (S8). Here, the temperature of the heat exchanger 5 is higher than the dew point set as the dew condensation prevention temperature ("NO" in S8).
In this case, it is determined again whether the room temperature is equal to or lower than the set room temperature (S7). On the other hand, if the detected temperature of the heat exchanger 5 is equal to or lower than the dew point ("YES" in S8), the combustion in the burner 3 is turned on (S9), and thereafter, the burner 3 is turned on in accordance with predetermined conditions.
Turn off combustion at. In this embodiment, when the temperature of the heat exchanger 5 becomes higher than the temperature (predetermined temperature) obtained by adding 10 ° C. to the dew point (“YES” in S10), the combustion in the burner 3 is turned off (S11). When the burner 3 is turned off,
It is determined again whether the room temperature is equal to or lower than the set room temperature (S7).
【００１９】このようにすれば、熱交換器５の温度を常
に燃焼ガスの露点以上に維持できるので、熱交換器５の
内壁面に燃焼ガスに含まれる水分が結露することを防止
でき、ドレンの発生を防止できる。従って、ドレンに含
まれる燃焼ガス中の酸性成分による熱交換器５の腐食を
防止でき、熱交換器５ひいては暖房機１の耐久性が向上
する。With this configuration, the temperature of the heat exchanger 5 can be constantly maintained at a temperature equal to or higher than the dew point of the combustion gas. Therefore, it is possible to prevent moisture contained in the combustion gas from condensing on the inner wall surface of the heat exchanger 5, and to prevent drainage. Can be prevented. Therefore, corrosion of the heat exchanger 5 due to acidic components in the combustion gas contained in the drain can be prevented, and the durability of the heat exchanger 5 and thus the heater 1 can be improved.
【００２０】ところで、上記説明から解るように、熱交
換器５の温度が燃焼ガスの露点以下にならないように維
持するためにバーナ３での燃焼をオンする場合は、対流
ファン２を作動させない。このようにすれば、新たな室
内空気と熱交換器５との間での熱交換が行われない。し
たがって、既に室温が設定温度より高いのに、燃焼熱に
より室温をさらに上昇させてしまうといった不具合を防
止でき、燃焼熱が熱交換器５の温度上昇にのみ用いられ
るため熱交換器５の温度を短時間で露点以上の温度に上
昇させることができる。また、熱交換器５の周囲の停滞
空気を高温に加熱することができるので、バーナをオフ
した後も露点以上に温度上昇させた熱交換器５が冷え難
い。As will be understood from the above description, when the combustion in the burner 3 is turned on to maintain the temperature of the heat exchanger 5 so as not to be lower than the dew point of the combustion gas, the convection fan 2 is not operated. In this way, heat exchange between the new indoor air and the heat exchanger 5 is not performed. Therefore, even if the room temperature is already higher than the set temperature, it is possible to prevent a problem that the room temperature is further increased by the combustion heat. Since the combustion heat is used only for increasing the temperature of the heat exchanger 5, the temperature of the heat exchanger 5 is reduced. It can be raised to a temperature above the dew point in a short time. Further, since the stagnant air around the heat exchanger 5 can be heated to a high temperature, the heat exchanger 5 whose temperature has been raised to the dew point or higher even after the burner is turned off is difficult to cool.
【００２１】なお、ステップ９（Ｓ９）でバーナ３での
燃焼をオンさせるときは、比例電磁弁１４ａの開度を最
小に設定することで室温の上昇を防止した方が良い。た
だし、結露防止のためのバーナ３の燃焼時間をより短く
する必要があるような場合は比例電磁弁１４ａの開度を
必要に応じて大きく設定すれば良い。また、ステップ１
０では、熱交換器５の温度に基づいてバーナ３をオフす
る時期を決定しているが、例えばバーナ３での燃焼をオ
ンしてから約１分経過後に熱交換器５の温度が露点に１
０℃加えた温度に達するとの実験結果に基づき、燃焼開
始から１分経過後にバーナ３での燃焼をオフするという
ように、燃焼開始からの経過時間に基づいて燃焼をオフ
する時期を決定してもよい。When the combustion in the burner 3 is turned on in step 9 (S9), it is better to prevent the rise in room temperature by setting the opening of the proportional solenoid valve 14a to a minimum. However, when it is necessary to shorten the combustion time of the burner 3 for preventing dew condensation, the opening of the proportional solenoid valve 14a may be set to a large value as necessary. Step 1
In the case of 0, the timing of turning off the burner 3 is determined based on the temperature of the heat exchanger 5. For example, the temperature of the heat exchanger 5 becomes the dew point about 1 minute after the combustion in the burner 3 is turned on. 1
Based on the experimental result that the temperature reaches 0 ° C., the time when the combustion is turned off is determined based on the elapsed time from the start of the combustion, such as turning off the burner 3 one minute after the start of the combustion. You may.
【００２２】また、本実施形態の暖房機１は、バーナ３
での燃焼量を比例制御弁１４ａを用いて制御すると共に
開閉電磁弁１４ｂを用いてバーナ３での燃焼をオンオフ
制御するものであるが、バーナ３での燃焼をオンオフ制
御するだけで室内空気（被加熱流体）の温度を設定室温
になるように制御するものにも適用できる。Further, the heater 1 of the present embodiment comprises a burner 3
The combustion amount in the burner 3 is controlled using the proportional control valve 14a and the on / off control of the combustion in the burner 3 is performed using the on-off electromagnetic valve 14b. The present invention can also be applied to a system in which the temperature of the fluid to be heated is controlled to a set room temperature.
【００２３】さらに、本実施形態の暖房機１は、熱交換
器５内に燃焼ガスを流し、熱交換器５の外壁に被加熱流
体としての室内空気を接触させて熱交換を行うものであ
るが、被加熱流体としての被加熱水を熱交換器内に流
し、熱交換器の外壁に燃焼ガスを接触させて温水を生成
する温水循環式の暖房機（例えば床暖房機）にも同様に
本発明を適用できる。この場合は、熱交換器の最下流側
に温度センサを設置すれば、これが熱交換器の出湯温度
を検出する被加熱流体温度検出手段及び熱交換器温度検
出手段として機能する。従って、上記実施形態の暖房機
と同様に、バーナでの燃焼がオフの状態で温度センサの
検出温度が露点（結露防止温度）以下になったときに、
バーナを燃焼させれば良い。Further, the heater 1 according to the present embodiment performs heat exchange by flowing combustion gas into the heat exchanger 5 and bringing indoor air as a fluid to be heated into contact with the outer wall of the heat exchanger 5. However, a heated water circulation type heater (for example, a floor heater) that causes heated water as a fluid to be heated to flow into the heat exchanger and contact the outer wall of the heat exchanger with the combustion gas to generate hot water. The present invention can be applied. In this case, if a temperature sensor is provided at the most downstream side of the heat exchanger, it functions as a heated fluid temperature detecting means and a heat exchanger temperature detecting means for detecting a tapping temperature of the heat exchanger. Therefore, similarly to the heater of the above embodiment, when the temperature detected by the temperature sensor falls below the dew point (condensation prevention temperature) in a state where the combustion in the burner is off,
What is necessary is just to burn a burner.
【００２４】[0024]
【発明の効果】以上のように、本発明によれば、熱交換
器温度を常に結露防止温度以上の温度に維持できるの
で、結露防止温度を燃焼ガスの露点以上の温度に設定す
ることにより、熱交換器内に燃焼ガスを送ったときに燃
焼ガスに含まれる水分が熱交換器内に結露していわゆる
ドレンが生ずることを確実に防止でき、熱交換器内の腐
食を防止できる。As described above, according to the present invention, the temperature of the heat exchanger can always be maintained at a temperature equal to or higher than the dew condensation prevention temperature. Therefore, by setting the dew condensation prevention temperature to a temperature equal to or higher than the dew point of the combustion gas, When the combustion gas is sent into the heat exchanger, it is possible to reliably prevent the moisture contained in the combustion gas from condensing in the heat exchanger to generate so-called drain, and to prevent corrosion in the heat exchanger.
【図１】 実施形態の暖房機の概略構成を示す図FIG. 1 is a diagram showing a schematic configuration of a heater according to an embodiment.
【図２】 暖房機におけるバーナでの燃焼の制御を示す
フローチャートFIG. 2 is a flowchart showing control of combustion in a burner in a heater.
１ 暖房機（熱交換装置） ２ 対流ファン（送風手段） ３ バーナ ４ 燃焼室 ５ 熱交換器 ６ コントローラ（制御手段） ７ 室温センサ（被加熱流体温度検出手段） １８ 熱交温度センサ（熱交換器温度検出手段） DESCRIPTION OF SYMBOLS 1 Heater (heat exchanger) 2 Convection fan (blowing means) 3 Burner 4 Combustion chamber 5 Heat exchanger 6 Controller (Control means) 7 Room temperature sensor (Heating fluid temperature detecting means) 18 Heat exchange temperature sensor (Heat exchanger) Temperature detection means)
Claims (4)
被加熱流体との間の熱交換を行う熱交換器と、被加熱流
体の温度を検出する被加熱流体温度検出手段と、当該被
加熱流体温度検出手段の検出温度が設定温度になるよう
にバーナでの燃焼をオンオフ制御する制御手段と、を備
える熱交換装置において、 前記熱交換器の温度を検出する熱交換器温度検出手段を
備え、 前記制御手段により、当該熱交換器温度検出手段の検出
温度が結露防止温度以下になると前記バーナでの燃焼を
オンすることを特徴とする熱交換装置。1. A heat exchanger for exchanging heat between a combustion gas generated by combustion in a burner and a fluid to be heated, a heated fluid temperature detecting means for detecting a temperature of the fluid to be heated, and a fluid to be heated. Control means for controlling on / off of the combustion in the burner so that the temperature detected by the temperature detecting means becomes the set temperature, comprising: a heat exchanger temperature detecting means for detecting the temperature of the heat exchanger; The heat exchanger according to claim 1, wherein the control unit turns on the combustion in the burner when the temperature detected by the heat exchanger temperature detecting unit becomes equal to or lower than the dew condensation preventing temperature.
あることを特徴とする請求項１に記載の熱交換装置。2. The heat exchange device according to claim 1, wherein the dew condensation preventing temperature is a dew point of the combustion gas.
手段の検出温度が結露防止温度以下になったことにより
オンになった前記バーナでの燃焼を、前記熱交換器温度
検出手段の検出温度が前記結露防止温度を超えた所定温
度より高くなるとオフすることを特徴とする請求項１又
は請求項２に記載の熱交換装置。3. The control means detects the combustion in the burner which is turned on when the temperature detected by the heat exchanger temperature detection means becomes equal to or lower than the dew condensation preventing temperature, by the heat exchanger temperature detection means. The heat exchange device according to claim 1 or 2, wherein the heat exchange device is turned off when a temperature becomes higher than a predetermined temperature exceeding the dew condensation prevention temperature.
手段を備えるものであり、 前記制御手段は、前記熱交換器温度検出手段の検出温度
に基づいてバーナでの燃焼をオンしたときは送風手段の
動作を停止状態にするものであることを特徴とする請求
項１から請求項３のいずれかに記載の熱交換装置。4. The fluid to be heated is room air, the heat exchange device includes a blowing unit for forcibly blowing the room air, and the control unit includes a control unit for detecting a temperature of the heat exchanger temperature detection unit. The heat exchanger according to any one of claims 1 to 3, wherein when the combustion in the burner is turned on based on the detected temperature, the operation of the blower is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16505298A JP3710623B2 (en) | 1998-06-12 | 1998-06-12 | Heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16505298A JP3710623B2 (en) | 1998-06-12 | 1998-06-12 | Heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11351559A true JPH11351559A (en) | 1999-12-24 |
| JP3710623B2 JP3710623B2 (en) | 2005-10-26 |
Family
ID=15804931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16505298A Expired - Fee Related JP3710623B2 (en) | 1998-06-12 | 1998-06-12 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3710623B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013127339A (en) * | 2011-12-19 | 2013-06-27 | Noritz Corp | Heat source machine |
| CN109442736A (en) * | 2018-11-30 | 2019-03-08 | 广东万和热能科技有限公司 | Water cooling burning wall-hung boiler and its control method, control device |
-
1998
- 1998-06-12 JP JP16505298A patent/JP3710623B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013127339A (en) * | 2011-12-19 | 2013-06-27 | Noritz Corp | Heat source machine |
| CN109442736A (en) * | 2018-11-30 | 2019-03-08 | 广东万和热能科技有限公司 | Water cooling burning wall-hung boiler and its control method, control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3710623B2 (en) | 2005-10-26 |
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