JP3973267B2 - Oil water heater - Google Patents

Oil water heater Download PDF

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Publication number
JP3973267B2
JP3973267B2 JP19312597A JP19312597A JP3973267B2 JP 3973267 B2 JP3973267 B2 JP 3973267B2 JP 19312597 A JP19312597 A JP 19312597A JP 19312597 A JP19312597 A JP 19312597A JP 3973267 B2 JP3973267 B2 JP 3973267B2
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Prior art keywords
hot water
water supply
electromagnetic pump
heat exchanger
flow rate
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JP19312597A
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Japanese (ja)
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JPH1123057A (en
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岩男 東
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株式会社長府製作所
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Description

【0001】
【発明の属する技術分野】
本発明は、一般に瞬間湯沸かし機と称される給湯機で、燃焼量比例制御バ−ナを搭載した石油給湯機の最低燃焼量以下の出湯特性の改善技術に関する。
【0002】
【従来の技術】
従来、石油給湯機において、低温給湯を得る場合、熱交換器の燃焼量比例制御バ−ナを最低燃焼と燃焼なしとで繰り返し作動させるようにしたものが知られている。この燃焼量比例制御バ−ナの繰り返し作動は、燃焼量比例制御バ−ナに石油燃料を供給するための電磁ポンプをオンオフ周期運転させることにより行なわれていた。
【0003】
【発明が解決しようとする課題】
しかしながら、従来のように、熱交換器の燃焼量比例制御バ−ナを最低燃焼と燃焼なしとで繰り返し作動させると、この繰り返し作動のための電磁ポンプのオンオフ周期運転と同様な周期で出湯温度が大きくハンチングするという問題があった。
【0004】
又、このハンチングを小さくするには、電磁ポンプのオンオフ周期を短く(燃焼量比例制御バ−ナの繰り返し作動回数を多く)すればよいが、この場合には、燃焼量比例制御バ−ナの着火音の発生回数が頻繁になるし、着火消火時の異臭の発生原因になるという問題があった。
【0005】
本発明は、上述のような従来の問題を解決するためになされたもので、電磁ポンプのオンオフ運転時に際し、そのオンオフ周期を長くして燃焼量比例制御バ−ナの着火音の発生回数及び着火消火時の異臭の発生を抑えながら、出湯温度のハンチングを小さくすることができるようにした石油給湯機を提供することを課題としている。
【0006】
【課題を解決するための手段】
上記課題を解決するために、本発明の石油給湯機は、
給水口に接続される給水路と、出湯口に至る出湯路と、この給水路と出湯路の間に設けられた熱交換器とによって給湯回路が形成され、前記熱交換器の燃焼量比例制御バ−ナに石油燃料を供給する電磁ポンプが設けられ、この電磁ポンプは燃焼量が第1の設定量から第1の設定量より多い第2の設定量までの間をほぼ比例的に増減するよう制御され、燃焼量が第1の設定量より少ない範囲においてはオンオフ運転で制御されている石油給湯機において、
前記出湯路の途中に湯水混合弁が設けられ、この湯水混合弁に接続するバイパス路が前記給水路の途中から分岐して設けられ、
前記電磁ポンプのオンオフ運転時に際し、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように前記湯水混合弁を制御する水量制御装置が設けられ、
前記電磁ポンプには、設定給湯温度及び入水温度及び入水流量から必要熱量を算出し、この必要熱量から燃焼量が前記第1の設定量より少ない範囲においては電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードフォワード制御すると共に、設定給湯温度と出湯温度の温度差及び入水流量から電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードバック制御する燃料供給制御装置が設けられている構成としている。
【0007】
この石油給湯機では、給水路の途中から分岐したバイパス路が、出湯路の途中に設けられた湯水混合弁に接続され、この湯水混合弁に、電磁ポンプのオンオフ運転時に際し、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように制御する水量制御装置が設けられている点が最大の特徴である。
【0008】
つまり、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるようにする為、入水流量が多いときには水量制御装置により湯水混合弁を開いてバイパス路への流量を多くし、入水流量が少ないときには水量制御装置により湯水混合弁を絞ってバイパス路への流量を少なくするようにしたものである。
【0009】
即ち、熱交換器流量を制御しない場合には、この熱交換器流量は入水流量に比例する。このとき、入水流量が多くて熱交換器流量が多いと、水が熱交換器を通過する時間が短くなる。この通過時間が短くなれば、電磁ポンプのオンオフ周期を短くしなければ出湯温度のハンチングを小さくすることができない。これでは、燃焼量比例制御バ−ナの着火音及び着火消火時の異臭の問題が生じる。
【0010】
逆に、入水流量が少なく熱交換器流量が少ないと、水が熱交換器を通過する時間が長くなる。この通過時間が長くなり過ぎると、水が沸騰してしまうという問題が生じる。
【0011】
そこで、この発明では、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように制御することによって、水の熱交換器での通過時間が長くなるようにしたもので、熱交換器に入った水は約30秒〜20秒かけて温度上昇することになる。これによって、電磁ポンプのオンオフ周期を長くしても出湯温度のハンチングを小さくすることができる。
【0012】
尚、出湯温度の制御は、石油燃料を燃焼量比例制御バ−ナに供給する電磁ポンプのオン時間とオフ時間を制御することにより行なわれる。この場合、燃料供給制御装置によって、設定給湯温度及び入水温度及び入水流量から必要熱量を算出し、この必要熱量から電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードフォワード制御すると共に、設定給湯温度と出湯温度の温度差及び入水流量から電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードバック制御することによって行なわれる。
【0013】
【発明の実施の形態】
以下、本発明の実施の形態を図面により説明する。図1は本発明に係る石油給湯機の実施の形態を示す給湯回路図である。
【0014】
この給湯回路は、給水口10に接続される給水路1と、出湯口20に至る出湯路2と、この給水路1と出湯路2の間に設けられた熱交換器3とによって形成されている。
【0015】
前記給水路1には、その上流側に水量センサ11が設けられ、下流側に分岐継手12が設けられている。又、出湯路2の途中に湯水混合弁4が設けられ、この湯水混合弁4に接続するバイパス路40が前記給水路1の分岐継手12に接続されている。
【0016】
前記熱交換器3には、燃焼量比例制御バーナ5が設けられ、この燃焼量比例制御バーナ5に石油燃料を供給する電磁ポンプ50が設けられている。この電磁ポンプは燃焼量が第1の設定量から第1の設定量より多い第2の設定量までの間をほぼ比例的に増減するよう制御され燃焼量が第1の設定量より少ない範囲においてはオンオフ運転で制御される。
【0017】
そして、前記湯水混合弁4には、前記電磁ポンプ50のオンオフ運転時に際し、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように湯水混合弁4を制御する水量制御装置6が設けられている。
【0018】
又、前記電磁ポンプ50には、設定給湯温度及び入水温度及び入水流量から必要熱量を算出し、この必要熱量から燃焼量が前記第1の設定量より少ない範囲においては電磁ポンプ50のオン時間とオフ時間を演算して電磁ポンプ50のオンオフ運転時間をフイードフォワード制御すると共に、設定給湯温度と出湯温度の温度差及び入水流量から電磁ポンプ50のオン時間とオフ時間を演算して電磁ポンプ50のオンオフ運転時間をフイードバック制御する燃料供給制御装置7が設けられている。尚、図において、80は湯温設定ダイヤル、81は入水温度センサ、82は出湯温度センサである。
【0019】
次に、熱交換器容量を1リットル、燃焼量比例制御バ−ナ5の最低燃焼の熱量を15000kcal/h、入水流量を8リットル/min、入水温度を20度、設定給湯温度を40度とし、この条件でのオンオフ運転の例を以下に説明する。
【0020】
図4は本発明の実施の形態に係る石油給湯機のオンオフ運転状態の説明図、図2及び図3は比較例のオンオフ運転状態の説明図で、それぞれ上段に燃焼量比例制御バ−ナのオンオフ周期を表し、中段に各オン時の給湯に与える熱量を表し、下段に各オン時の給湯に与える熱量の合計の出湯温度を表している。
【0021】
まず、上記条件での必要熱量は、
(設定給湯温度−入水温度)×入水流量×60により、9600kcal/hとなる。これは燃焼量比例制御バ−ナ5の最低燃焼の熱量の64%となり、例えば、100秒あたり64秒のオン時間となる。この際の出湯温度の平均は40度となる。
【0022】
図2の比較例は、1分間に8回のオンオフ周期で、熱交換器流量を6リットル/min(混水率25%)とした例で、
オン時間は、(60/8)×0.64により4.8秒となる。
オフ時間は、(60/8)−4.8により2.7秒となる。
【0023】
この場合、オフ時間中であっても熱交換器3内には湯が残っているため、約10秒間(熱交換器容量が1リットル、熱交換器流量が6リットル/minなので熱交換器に流入し始めてから流出が完了するまで10秒かかるため。)は温度が高い。そして、この比較例では、オンオフ周期が8回と短いため、出湯温度のハンチングを抑えることができるが、その分、燃焼量比例制御バ−ナ5の繰り返し作動回数が多くなるため、着火音の発生回数が頻繁になるし、着火消火時の異臭の発生という問題がある。
【0024】
図3の比較例は、1分間に4回のオンオフ周期で、熱交換器流量を6リットル(混水率25%)とした例で、
オン時間は、(60/4)×0.64により9.6秒となる。
オフ時間は、(60/4)−9.6により5.4秒となる。
【0025】
この比較例では、オンオフ周期が4回と長いため、燃焼量比例制御バ−ナ5の繰り返し作動回数が少なく、着火音回数及び着火消火時の異臭の発生を抑えることができるが、各オン時の熱量の重なりが図2に比べて疎になり、結果として出湯温度のハンチングが大きくなるという問題がある。
【0026】
次に、図4の実施の形態は、1分間に4回のオンオフ周期で、熱交換器流量を3リットル(混水率63%)とした例で、
オン時間は、(60/4)×0.64により9.6秒となる。
オフ時間は、(60/4)−9.6により5.4秒となる。
【0027】
この実施の形態では、図3の比較例と同様に、オンオフ周期が4回と長いため、燃焼量比例制御バ−ナ5の繰り返し作動回数が少なく、着火音の発生回数及び着火消火時の異臭の発生を抑えることができる。又、図3の比較例に比べて熱交換器流量が1/2であるため、各オン時の給湯に与える熱量が2倍の時間に分布し、結果として出湯温度のハンチングを小さくすることができる。
【0028】
以上、本発明の実施の形態を図面により説明してきたが、本発明の具体的な構成はこの実施の形態に限定されるものではない。
【0029】
【発明の効果】
以上説明してきたように、本発明の石油給湯機にあっては、最低燃焼量以下のオンオフ運転時に際し、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように制御するため、水の熱交換器での通過時間が長くなり、これによって、電磁ポンプのオンオフ周期を長くすることができる。
【0030】
従って、電磁ポンプのオンオフ運転時に際し、そのオンオフ周期を長くして燃焼量比例制御バ−ナの着火音及び着火消火時の異臭の発生を抑えながら、出湯温度のハンチングを小さくすることができるという効果が得られる。
【図面の簡単な説明】
【図1】本発明に係る石油給湯機の実施の形態を示す給湯回路図である。
【図2】比較例のオンオフ運転状態の説明図である。
【図3】比較例のオンオフ運転状態の説明図である。
【図4】本発明の実施の形態に係る石油給湯機のオンオフ運転状態の説明図である。
【符号の説明】
1 給水路
10 給水口
2 出湯路
20 出湯口
3 熱交換器
4 湯水混合弁
40 バイパス路
5 燃焼量比例制御バ−ナ
50 電磁ポンプ
6 水量制御装置
7 燃料供給制御装置
[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a technology for improving the hot water discharge characteristics of a hot water heater generally called an instantaneous water heater, which is less than the minimum combustion amount of an oil water heater equipped with a combustion amount proportional control burner.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in oil water heaters, when obtaining low-temperature hot water, it is known that a combustion amount proportional control burner of a heat exchanger is operated repeatedly with minimum combustion and no combustion. This repeated operation of the combustion amount proportional control burner has been performed by operating an on / off cycle of an electromagnetic pump for supplying petroleum fuel to the combustion amount proportional control burner.
[0003]
[Problems to be solved by the invention]
However, when the combustion quantity proportional control burner of the heat exchanger is operated repeatedly with minimum combustion and no combustion as in the conventional case, the temperature of the tapping water is changed at the same cycle as the on / off cycle operation of the electromagnetic pump for this repeated operation. There was a problem that hunting greatly.
[0004]
In order to reduce this hunting, the on / off cycle of the electromagnetic pump may be shortened (the number of repetitions of the combustion amount proportional control burner is increased). In this case, however, the combustion amount proportional control burner There have been problems that the number of occurrences of ignition noise is frequent and a strange odor is generated during ignition and extinguishing.
[0005]
The present invention has been made in order to solve the above-described conventional problems. In the on / off operation of the electromagnetic pump, the on / off cycle is lengthened to increase the number of occurrences of ignition noise of the combustion amount proportional control burner. An object of the present invention is to provide an oil water heater capable of reducing the hunting of the hot water temperature while suppressing the generation of a strange odor during ignition and extinguishing.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the oil water heater of the present invention is
A hot water supply circuit is formed by a water supply channel connected to the water supply port, a hot water supply channel leading to the hot water outlet, and a heat exchanger provided between the water supply channel and the hot water supply channel, and the combustion amount proportional control of the heat exchanger An electromagnetic pump for supplying petroleum fuel to the burner is provided, and this electromagnetic pump increases or decreases approximately proportionally between a first set amount and a second set amount greater than the first set amount. It is controlled, in oil water heater is controlled by on-off operation in an amount ranging combustion is less than the first set amount,
A hot water mixing valve is provided in the middle of the hot water supply path, and a bypass path connected to the hot water mixing valve is branched from the middle of the water supply path,
When the electromagnetic pump is turned on and off, a water amount control device for controlling the hot water / water mixing valve so that the heat exchanger flow rate per minute is 2 to 3 times the heat exchanger capacity regardless of the water flow rate. Provided,
The electromagnetic pump calculates the required heat quantity from the set hot water supply temperature, incoming water temperature, and incoming water flow rate, and calculates the on-time and off-time of the electromagnetic pump in the range where the combustion quantity is less than the first set quantity from the required heat quantity. The feed-forward control of the on / off operation time of the electromagnetic pump and the feedback control of the on / off operation time of the electromagnetic pump by calculating the on / off time of the electromagnetic pump from the temperature difference between the set hot water supply temperature and the tapping temperature and the incoming water flow rate The fuel supply control device is provided.
[0007]
This oil water heater, a bypass passage branched from the middle of the water supply passage is connected to the hot and cold water mixing valve provided in the middle of the pouring channel, this hot and cold water mixing valve, when the time-off operation of the electromagnetic pump, some water inlet flow rate Regardless of the above, the greatest feature is that a water amount control device is provided for controlling the heat exchanger flow rate per minute to be 2 to 3 times the heat exchanger capacity.
[0008]
In other words, in order to make the heat exchanger flow rate per minute 2 to 3 times the heat exchanger capacity, when the incoming water flow rate is high, the hot water mixing valve is opened by the water amount control device to increase the flow rate to the bypass. When the incoming water flow rate is low, the hot water mixing valve is throttled by the water amount control device to reduce the flow rate to the bypass passage.
[0009]
That is, when the heat exchanger flow rate is not controlled, the heat exchanger flow rate is proportional to the incoming water flow rate. At this time, if the incoming water flow rate is high and the heat exchanger flow rate is high, the time for water to pass through the heat exchanger is shortened. If this passage time is shortened, the hot water temperature hunting cannot be reduced unless the on / off cycle of the electromagnetic pump is shortened. This causes problems of ignition noise of the combustion amount proportional control burner and offensive odor during ignition / extinguishing.
[0010]
Conversely, when the incoming water flow rate is low and the heat exchanger flow rate is low, the time for water to pass through the heat exchanger becomes long. If this passage time becomes too long, there arises a problem that water boils.
[0011]
Therefore, in the present invention, the passage time in the water heat exchanger is controlled by controlling the heat exchanger flow rate per minute to be 2 to 3 times the heat exchanger capacity regardless of the amount of the incoming water flow rate. The water that has entered the heat exchanger rises in temperature over about 30 to 20 seconds. This makes it possible to reduce the hunting of the hot water temperature even if the on / off cycle of the electromagnetic pump is lengthened.
[0012]
The tapping temperature is controlled by controlling the on time and off time of the electromagnetic pump that supplies petroleum fuel to the combustion amount proportional control burner. In this case, the fuel supply control device calculates the required heat quantity from the set hot water supply temperature, incoming water temperature, and incoming water flow rate, calculates the on / off time of the electromagnetic pump from this required heat quantity, and feeds the on / off operation time of the electromagnetic pump. In addition to the forward control, the on / off time of the electromagnetic pump is calculated from the temperature difference between the set hot water supply temperature and the tapping temperature and the incoming water flow rate, and the on / off operation time of the electromagnetic pump is feedback controlled.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a hot water supply circuit diagram showing an embodiment of an oil water heater according to the present invention.
[0014]
This hot water supply circuit is formed by a water supply path 1 connected to the water supply port 10, a hot water supply path 2 leading to the hot water outlet 20, and a heat exchanger 3 provided between the water supply path 1 and the hot water supply path 2. Yes.
[0015]
The water supply path 1 is provided with a water amount sensor 11 on the upstream side and a branch joint 12 on the downstream side. A hot water / mixing valve 4 is provided in the middle of the hot water supply channel 2, and a bypass 40 connected to the hot / water mixing valve 4 is connected to the branch joint 12 of the water supply channel 1.
[0016]
The heat exchanger 3 is provided with a combustion amount proportional control burner 5, and an electromagnetic pump 50 for supplying petroleum fuel to the combustion amount proportional control burner 5 is provided. The electromagnetic pump is controlled so as to increase or decrease in a proportional proportion between the first set amount and the second set amount greater than the first set amount, and in a range where the combustion amount is less than the first set amount. Is controlled by on-off operation.
[0017]
Then, wherein the hot and cold water mixing valve 4, when the time-off operation of the electromagnetic pump 50, some no matter in the incoming water flow, so that the heat exchanger flow rate per 1 minute is 2-3 times of the heat exchanger capacity A water amount control device 6 for controlling the hot and cold mixing valve 4 is provided.
[0018]
The electromagnetic pump 50 calculates a required heat quantity from the set hot water supply temperature, the incoming water temperature, and the incoming water flow rate. From the required heat quantity, the on-time of the electromagnetic pump 50 is calculated in a range where the combustion quantity is smaller than the first set quantity. The on-off operation time of the electromagnetic pump 50 is feedforward controlled by calculating the off-time, and the on-off time and off-time of the electromagnetic pump 50 are calculated from the temperature difference between the set hot water supply temperature and the tapping temperature and the incoming water flow rate. A fuel supply control device 7 is provided for feedback control of the on / off operation time. In the figure, 80 is a hot water temperature setting dial, 81 is a water temperature sensor, and 82 is a hot water temperature sensor.
[0019]
Next, the heat exchanger capacity is 1 liter, the minimum combustion heat quantity of the combustion quantity proportional control burner 5 is 15000 kcal / h, the incoming water flow rate is 8 liters / min, the incoming water temperature is 20 degrees, and the set hot water supply temperature is 40 degrees. An example of on / off operation under these conditions will be described below.
[0020]
FIG. 4 is an explanatory diagram of the on / off operation state of the oil water heater according to the embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the on / off operation state of the comparative example. The ON / OFF cycle is shown, the amount of heat given to the hot water supply at each ON time is shown in the middle stage, and the total hot water temperature of the heat quantity given to the hot water supply at each ON time is shown in the lower stage.
[0021]
First, the amount of heat required under the above conditions is
It becomes 9600 kcal / h by (setting hot water supply temperature-incoming water temperature) x incoming water flow rate x 60. This is 64% of the minimum combustion heat quantity of the combustion quantity proportional control burner 5, for example, an on time of 64 seconds per 100 seconds. At this time, the average tapping temperature is 40 degrees.
[0022]
The comparative example of FIG. 2 is an example in which the heat exchanger flow rate is 6 liters / min (mixed water ratio 25%) with an on / off cycle of 8 times per minute.
The on-time is 4.8 seconds by (60/8) × 0.64.
The off time is 2.7 seconds according to (60/8) -4.8.
[0023]
In this case, since hot water remains in the heat exchanger 3 even during the off time, the heat exchanger has a capacity of 1 liter and the heat exchanger flow rate is 6 liter / min. Since it takes 10 seconds from the start of the inflow until the outflow is completed, the temperature is high. In this comparative example, since the ON / OFF cycle is as short as 8 times, hunting of the tapping temperature can be suppressed. However, since the number of repeated operations of the combustion amount proportional control burner 5 increases, The frequency of occurrence is frequent, and there is a problem of generation of a strange odor during ignition and extinguishing.
[0024]
The comparative example of FIG. 3 is an example in which the heat exchanger flow rate is 6 liters (mixed water ratio 25%) with an on / off cycle of 4 times per minute.
The on-time is 9.6 seconds by (60/4) × 0.64.
The off time is 5.4 seconds according to (60/4) -9.6.
[0025]
In this comparative example, since the on / off cycle is as long as four times, the number of times of repeated operation of the combustion amount proportional control burner 5 is small, and the number of ignition sounds and the generation of a strange odor during ignition / extinguishing can be suppressed. There is a problem that the overlap of the heat amount becomes sparse compared to FIG. 2, and as a result, the hunting of the tapping temperature increases.
[0026]
Next, the embodiment of FIG. 4 is an example in which the heat exchanger flow rate is 3 liters (mixed water ratio 63%) with an on / off cycle of 4 times per minute.
The on-time is 9.6 seconds by (60/4) × 0.64.
The off time is 5.4 seconds according to (60/4) -9.6.
[0027]
In this embodiment, as in the comparative example of FIG. 3, since the on / off cycle is as long as four times, the number of repeated operations of the combustion amount proportional control burner 5 is small, the number of occurrences of ignition noise, and the off-flavor during ignition / extinguishing. Can be suppressed. Further, since the heat exchanger flow rate is ½ compared to the comparative example of FIG. 3, the amount of heat given to the hot water supply at each ON time is distributed over twice the time, and as a result, the hunting of the hot water temperature can be reduced. it can.
[0028]
As mentioned above, although embodiment of this invention has been described with reference to the drawings, the specific configuration of this invention is not limited to this embodiment.
[0029]
【The invention's effect】
As described above, in the oil water heater of the present invention, the heat exchanger flow rate per minute is equal to the heat exchanger capacity regardless of the water flow rate during on / off operation below the minimum combustion amount. Since the control is performed so as to be two to three times, the passage time of the water in the heat exchanger becomes long, and thereby the on / off cycle of the electromagnetic pump can be lengthened.
[0030]
Therefore, during the on / off operation of the electromagnetic pump, it is possible to reduce the hot water temperature hunting while lengthening the on / off cycle to suppress the ignition sound of the combustion amount proportional control burner and the generation of a strange odor during ignition / extinguishing. An effect is obtained.
[Brief description of the drawings]
FIG. 1 is a hot water supply circuit diagram showing an embodiment of an oil water heater according to the present invention.
FIG. 2 is an explanatory diagram of an on / off operation state of a comparative example.
FIG. 3 is an explanatory diagram of an on / off operation state of a comparative example.
FIG. 4 is an explanatory diagram of an on / off operation state of the oil water heater according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water supply path 10 Water supply port 2 Hot water supply path 20 Hot water outlet 3 Heat exchanger 4 Hot water mixing valve 40 Bypass path 5 Combustion quantity proportional control burner 50 Electromagnetic pump 6 Water quantity control apparatus 7 Fuel supply control apparatus

Claims (1)

給水口に接続される給水路と、出湯口に至る出湯路と、この給水路と出湯路の間に設けられた熱交換器とによって給湯回路が形成され、前記熱交換器の燃焼量比例制御バ−ナに石油燃料を供給する電磁ポンプが設けられ、この電磁ポンプは燃焼量が第1の設定量から第1の設定量より多い第2の設定量までの間をほぼ比例的に増減するよう制御され、燃焼量が第1の設定量より少ない範囲においてはオンオフ運転で制御されている石油給湯機において、
前記出湯路の途中に湯水混合弁が設けられ、この湯水混合弁に接続するバイパス路が前記給水路の途中から分岐して設けられ、
前記電磁ポンプのオンオフ運転時に際し、入水流量の多少に関係なく、1分間当たりの熱交換器流量が熱交換器容量の2〜3倍になるように前記湯水混合弁を制御する水量制御装置が設けられ、
前記電磁ポンプには、設定給湯温度及び入水温度及び入水流量から必要熱量を算出し、この必要熱量から燃焼量が前記第1の設定量より少ない範囲においては電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードフォワード制御すると共に、設定給湯温度と出湯温度の温度差及び入水流量から電磁ポンプのオン時間とオフ時間を演算して電磁ポンプのオンオフ運転時間をフイードバック制御する燃料供給制御装置が設けられていることを特徴とする石油給湯機。
A hot water supply circuit is formed by a water supply channel connected to the water supply port, a hot water supply channel leading to the hot water outlet, and a heat exchanger provided between the water supply channel and the hot water supply channel, and the combustion amount proportional control of the heat exchanger An electromagnetic pump for supplying petroleum fuel to the burner is provided, and this electromagnetic pump increases or decreases approximately proportionally between a first set amount and a second set amount greater than the first set amount. In the oil water heater that is controlled by the on-off operation in a range where the combustion amount is less than the first set amount ,
A hot water mixing valve is provided in the middle of the hot water supply path, and a bypass path connected to the hot water mixing valve is branched from the middle of the water supply path,
When the electromagnetic pump is turned on and off, a water amount control device for controlling the hot water / water mixing valve so that the heat exchanger flow rate per minute is 2 to 3 times the heat exchanger capacity regardless of the water flow rate. Provided,
The electromagnetic pump calculates the required heat quantity from the set hot water supply temperature, incoming water temperature, and incoming water flow rate, and calculates the on-time and off-time of the electromagnetic pump from the required heat quantity when the combustion quantity is less than the first set quantity. The feed-forward control of the on / off operation time of the electromagnetic pump and the feedback control of the on / off operation time of the electromagnetic pump by calculating the on / off time of the electromagnetic pump from the temperature difference between the set hot water supply temperature and the tapping temperature and the incoming water flow rate An oil water heater, characterized in that a fuel supply control device is provided.
JP19312597A 1997-07-02 1997-07-02 Oil water heater Expired - Fee Related JP3973267B2 (en)

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Application Number Priority Date Filing Date Title
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JP3973267B2 true JP3973267B2 (en) 2007-09-12

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JP2012063073A (en) * 2010-09-16 2012-03-29 Sefutei:Kk Hot-air device using waste oil

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