JP3719272B2 - Bath kettle with water heater - Google Patents

Description

【００３０】
【数２】

【００３１】
これらの数１および数２の式において、当初の単位時間当りの追焚き出力を「Ｑ」、変更後の単位時間当りの追焚き出力を「Ｑ−Ｑ_１」とする。その他の記号は、比熱を「Ｃ」、浴槽の残湯量を「Ｗ _１ 」、浴槽配管等の放熱量（単位時間当り）を「Ｈ」、温度「Ｔ _１ 」から「Ｔ _２ 」まで沸かし上げる時間を「ｔ _１ 」、途中の給水量を「Ｗ _２ 」、温度「Ｔ _３ 」から「Ｔ _４ 」まで沸かし上げる時間を「ｔ _２ 」とする。
【００３２】
そしてこれらの数１および数２の式をグラフに示すと図３のようになる。横軸にｔ／ΔＴを採り、縦軸に浴槽の残湯量（Ｗ）を採っている。この図３に示されるように、数１の（１）式および数２の（２）式はいずれも原点を通る１次関数となるが、（１）式の傾きを「ａ」、（２）式の傾きを「ｂ」とすると、
【００３３】
ａ＝（Ｑ−Ｈ）／Ｃ、
ｂ＝（Ｑ−Ｑ_１−Ｈ）／Ｃ＝ａ−Ｑ_１／Ｃ
となる。よって（１）式、（２）式を書き直すと、次の数３、数４のようになる。
【００３４】
【数３】

【００３５】
【数４】

【００３６】
そして（３）式ではｔ／ΔＴがｔ_１／（Ｔ_２−Ｔ_１）のときに、（４）式ではｔ_２／（Ｔ_４−Ｔ_３）のときに残湯量（Ｗ）がＷ_１で等しくなるわけだから、この条件より傾きａが求まり、Ｗ_１が得られる。次の数５に示した通りである。
【００３７】
【数５】

【００３８】
しかして上記した実施例に示されるように、浴槽へ注湯するに際して予め２度追焚きし、その間に追焚き出力を変更することにより残湯量の測定演算式を２つ提示し、その２つの演算式の連立方程式を解くことにより浴槽の残湯量を算出するものである。
【００３９】
したがってその浴槽の残湯量が、外気温度の変化や浴槽あるいは配管からの放熱量の差異による影響を受けることなく正確に把握されるものであり、必要量の注湯が正しく行なわれることになる。
尚、本発明は上記実施例に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能であることは勿論である。
【００４０】
【発明の効果】
以上説明したことから明らかなように本発明の給湯器付風呂釜によれば、浴槽へ給湯するに際し浴槽内の残湯量を浴槽・配管からの放熱や、外気温度の影響を受けることなく正確に算出し、足し湯量を正確に把握できるものであるから、給湯量が多過ぎたり、少な過ぎたりするといったことが起こらない。したがって利用者は冬場と夏場の季節変動等の影響を受けることなく常に好みの湯量の給湯がでいて大変使い勝手が良いものである。
【図面の簡単な説明】
【図１】 本発明の一実施例に係る給湯器付風呂釜の概略構成を示す図面である。
【図２】 図１に示した給湯器付風呂釜に適用される本発明の実施例に係る制御フローチャートである。
【図３】 図２に示した制御フローチャートに基づき浴槽の残湯量を算出する根拠を説明した図である。
【符号の説明】
１ 給湯器付風呂釜
２ 浴槽
１０ 循環加熱部
１５ 循環ポンプ
１８ サーミスタ（ＴＨ_１）
３０ 給湯器部
４４ 給水弁（ＢＨＶ）
５０ コントローラ[0001]
[Industrial application fields]
The present invention calculates the amount of hot water in a bathtub and is insufficient in a hot water bath equipped with a hot water heater that can supply hot water heated by a water heater to the bathtub and circulate and heat the hot water in the bathtub. The present invention relates to a hot water bath-equipped bath with a desired amount of hot water by automatically supplying a quantity of hot water.
[0002]
[Prior art]
Conventionally, water in the bathtub is circulated forcibly by a pump, and a circulation heating circuit that heats it with a heat exchanger provided in the middle of the circulation line, and hot water that is taken in from a water supply or the like and heated by another heat exchanger is circulated. 2. Description of the Related Art A hot water heater equipped with a hot water supply circuit that supplies a bathtub through a circuit is used. This kind of hot water heater equipped with a water heater has a water temperature sensor, calculates the amount of hot water in the bathtub from the rise in temperature when the tank is reheated, and automatically supplies the amount of hot water to the desired water level. There are also things.
[0003]
An example of performing such control is described in JP-A 61-15047. In the control method disclosed in the publication, the hot water in the bathtub is heated for a certain time, the amount of hot water in the bathtub is calculated from the temperature rise at that time, and the hot water supply amount of the hot water is determined based on the calculated value. Let that point.
[0004]
[Problems to be solved by the invention]
However, the conventional water heater control disclosed in the above publication has the following problems. That is, in the hot water heater control in the above publication, the amount of hot water is calculated by dividing the amount of heat supplied when heated for a certain period of time by the temperature rise at that time, but in calculating the amount of heat applied to the hot water, Even if the heat efficiency of the exchanger is taken into consideration, it does not take into account that heat is radiated in each part such as pipes and bathtubs.
[0005]
If the amount of heat released is always constant, it is sufficient to allow for the heat efficiency of the heat exchanger. Even in a kettle, it depends on the water temperature and the outside temperature. A particular problem is that the amount of heat radiation differs greatly between winter and summer because there is a difference in the outside temperature exceeding 20 ° C. depending on the season, and the influence cannot be ignored.
[0006]
For example, in summer, the outside air temperature may be close to 30 ° C., in which case the difference between the hot water temperature and the outside air temperature is only about 10 ° C. Therefore, the amount of heat released is small, and most of the heat supplied from the burner is used to raise the water temperature. For this reason, the water temperature rise width is large, the amount of hot water in the bathtub is calculated to be small, and a large amount of hot water is supplied.
[0007]
On the other hand, at night in winter, the outside air temperature drops to about 0 ° C., and in that case, the difference between the hot water temperature and the outside air temperature reaches nearly 40 ° C., and the heat radiation is large. Therefore, even if the amount of heat supplied from the burner is the same, the rise in the water temperature is small compared to the summer, and as a result, the amount of hot water in the bathtub is calculated to be considerably larger than the actual amount. Become. In other words, there is a tendency for hot water shortage in winter when a sufficient amount of hot water is required.
[0008]
The present invention was made to solve the above-described problems of the prior art, and accurately calculates the amount of hot water in the bathtub without being affected by the outside air temperature or heat radiation from the bathtub piping, etc. An object of the present invention is to provide a water bath with a water heater that can perform an appropriate amount of hot water. As a result, an amount of automatic hot water supply with no excess or deficiency is achieved, and the convenience of use for the user is enhanced.
[0009]
[Means for Solving the Problems]
In order to achieve this object, a hot water heater equipped with a hot water heater according to the present invention includes a hot water supply system for supplying hot water heated by the water heater to the bathtub, and a recirculation heating system for circulating and heating the hot water in the bathtub. has the door, said means for Tsui焚heating hot water temperature T ₂ the hot water in the bathtub by additionally fired circulating heating system from the initial remaining hot water temperatures T ₁ or subsequent焚出force Q, the add焚出force Q-Q ₁ means for hot and T ₃ additionally fired again heated to T ₄ from the bath is changed to increase the temperature of the hot water of at least additionally fired heated in a bathtub by these means _{(T 2 -T 1, T 4} - T ₃ ), a time required for temperature rise (t ₁ , t ₂ ), and a means for calculating the amount of remaining hot water in the bathtub based on the information of the memorial change output (Q ₁ ) , and the remaining amount obtained by the calculating means The gist is that the hot water of the shortage amount is added into the bathtub based on the hot water amount.
[0010]
[Action]
According to the bathtub with a water heater according to the present invention having the above-described configuration, when hot water is supplied to the bathtub, the hot water heated by the water heater is supplied to the bathtub through the hot water supply system, and the hot water in the bathtub is added. When bathing, hot water in the bathtub is circulated and heated through the recirculation circulation heating system, but if there is remaining hot water in the bathtub during automatic hot water supply to the bathtub, the following The amount of remaining hot water in the bathtub is determined by such steps. That is, the hot water in the bathtub is subjected to the memorial heating by the memorial circulation heating system, then the memorial output is changed, and the hot water in the bath is reheated again. The amount of remaining hot water in the bathtub is obtained by calculation based on information such as the rising temperature of the hot water, the time required for the temperature rise, and the amendment change output . And the hot water of the insufficient hot water amount which deducted the amount of hot water calculated | required by the calculation from the set hot water amount will be added to a bathtub.
[0011]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hot water bath equipped with a water heater as an embodiment embodying the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of a hot water heater-equipped bath. The bath 1 includes a circulation heating unit 10 that circulates and heats water in the bathtub 2, and a water heater unit 30 that supplies hot water obtained by heating tap water or the like by gas combustion to the bathtub 2 via the circulation heating unit 10. And has a controller 50 for controlling these operations.
[0012]
The hot water supply unit 30 includes a water supply channel 31 to which cold water such as tap water is supplied, a heat exchanger 32 connected to the water supply channel 31, a hot water supply channel 33 connected to the downstream side of the heat exchanger 32, and a hot water supply A flow path is constituted by a bath hot water supply path 34 and a general hot water supply path 35 provided by branching the path 33 at point A. A water flow switch 36 for detecting the flow of water and a thermistor 37 for detecting the incoming water temperature are provided in the water supply passage 31, and a thermistor 39 for detecting the outgoing hot water temperature is provided in the hot water passage 33, respectively. A burner 40 is provided below the heat exchanger 32, and a gas conduit 41 is provided with an original electromagnetic valve 42 for opening and closing the gas flow path and a proportional control valve 43 for adjusting the gas flow rate.
[0013]
A bath hot water supply passage 34 branched from the hot water supply passage 33 is a water supply valve (BHV) 44 that opens and closes, a flow rate sensor 45 that detects a flow rate of hot water supply to the bathtub 2, an edge cut-off valve 46, and a water heater from the circulation heating unit 10. And a check valve 47 that prevents backflow to the unit 30, and is connected to the circulating heating unit 10 at point B. On the other hand, an external hot water supply pipe 4 leading to a hot water tap 5 such as a washroom or a shower is connected to a general hot water supply path 35 branched from the hot water supply path 33.
[0014]
The circulation heating unit 10 includes a heat exchanger 13 that is heated by the burner 12 in the middle of the circulation path 11 in the pot that circulates the water in the bathtub 2. Further, on the upstream side of the heat exchanger 13 of the internal circulation path 11, a water flow switch (BFS) 14 that detects the presence or absence of a water flow, a circulation pump 15 that circulates the water in the bathtub 2 to the internal circulation path 11, and the bathtub 2 A thermistor (TH ₂ ) 18 for detecting the temperature of the incoming water from the heat exchanger 13. A thermistor (TH ₂ ) 19 for detecting the temperature of the hot water heated by the burner 12 is provided downstream of the heat exchanger 13 in the circulation path 11. Is provided. The gas conduit 20 of the burner 12 is provided with an original solenoid valve 21 and a main solenoid valve 22.
[0015]
The thermistor (TH ₁ ) 18 is provided in an appliance, and since the appliance is often installed outdoors, it also has a function of detecting the outside air temperature. The internal circulation path 11 is connected to the forward pipe 6 and the return pipe 7 and communicates with the bathtub 2. Although not shown, the circulation heating unit 10 and the hot water supply unit 30 are provided with a fan for supplying combustion air, an ignition device, a combustion safety switch, and the like.
[0016]
The controller 50 is responsible for automatic bath hot water control, circulation heating control, general hot water control, and the like. The controller 50 includes a CPU constituting a known logical operation circuit, a ROM for storing various programs, and a temporary storage of data. It comprises a RAM to be performed, an input interface for inputting signals from various sensors, an output interface for outputting drive signals to various actuators, and the like. And in order to perform the automatic hot-water supply control mentioned later, the hot water amount calculation program in a bathtub, the hot water supply command program, various numerical values, etc. are memorize | stored in ROM. Similarly, the RAM is provided with a temperature memory area, a time memory area, and the like.
[0017]
The hot water heater equipped with a water heater can be operated by a remote control, and the remote control is provided with a power switch, an automatic operation switch, a hot switch, a plenty of switches, a lukewarm switch, and the like (not shown).
[0018]
A basic operation of the bath 1 having the above-described configuration will be described. First, when supplying hot water to the bathtub 2, when the automatic operation switch of the bath remote control is pressed, the water supply valve 44 of the bath hot water supply channel 34 is opened, and when the water flow is detected by the water flow switch 36, the water heater 30 The original solenoid valve 42 is opened and the burner 40 is ignited. Then, when it passes through the heat exchanger 32, it is heated by the combustion heat of the gas in the burner 40 to become hot water of a predetermined temperature, sent to the hot water outlet 33, and from the point A via the bath hot water supply 34 to the point B at the point B It flows into the circulation path 11 and is supplied to the bathtub 2 through the forward piping 6 and the return piping 7.
[0019]
Here, the controller 50 uses the feedback control based on the tapping temperature detected by the thermistor 39 and a preset temperature set in advance, and the feedforward control based on the incoming water temperature detected by the thermistor 37 to achieve a combustion amount (proportional control valve). 43) can be controlled. The hot water temperature can be adjusted by pressing “hot” on the hot water temperature changeover switch and hot water temperature fine adjustment switch, and by pressing “warm”, the temperature can be lowered to obtain an arbitrary hot water temperature.
[0020]
Here, if the external hot water tap 5 is opened instead of pressing the automatic operation switch of the remote controller, the hot water heated by the heat exchanger 32 passes from the hot water supply path 33 via the general hot water supply path 35. It flows to the external hot water supply pipe 4, and hot water can be used in a bathroom or shower.
[0021]
On the other hand, when the water in the bathtub 2 is circulated and heated, that is, when the soaking is pushed, the circulation pump 15 of the internal circulation path 11 is driven when the switch is pressed, and the water in the bathtub 2 is transferred from the return pipe 7 to the internal circulation path 11. It flows in and is circulated to the bathtub 2 via the forward piping 6. Here, since the check valve 47 is provided in the bath hot water supply channel 34, the water in the bathtub 2 does not flow backward to the hot water supply unit 30 and reach the hot water tap 5. And if the former solenoid valve 21 and the main solenoid valve 22 are opened and the burner 12 is ignited, the water flowing through the heat exchanger 13 in the internal circulation path 11 is heated by the combustion heat. Each operation is performed manually or by the controller 50, and the user can give various commands to the controller 50 by a known remote controller or the like.
[0022]
Next, automatic hot water supply control executed by the controller 50, which is a feature of the present invention, in the bathtub 1 having the above-described configuration and basic operation will be described. The automatic hot water control controls the hot water in the bathtub 2 when there is hot water in the bathtub 2 and calculates the amount of hot water in the bathtub from the supply heat amount and the rising temperature in consideration of the heat release at that time, and the lack of hot water amount The water is supplied from the water heater unit 30 to be replenished, and the hot water in the bathtub 2 is adjusted to an appropriate amount.
[0023]
Next the automatic hot water supply control routine according to an embodiment of the present invention will be described with reference to the control flowchart shown in FIG. In this routine, when the power is turned on (S21) and then the automatic hot water supply switch is turned on (S22: “YES”), the circulation pump 15 of the internal circulation path 11 is turned on (S23). temperature of the remaining hot water (T ₁₎ is detected by the detection signal from the thermistor TH ₁ when the temperature of the remaining hot water is Hakara' saw rollers became homogeneous (S24). Temperature of the remaining hot water in this case (T ₁₎ is stored in the temperature memory area of the RAM of the controller 50, Ru is used as data for the calculation of which will be described later remaining hot water.
[0024]
The circulating gas burner 12 of the heating unit 10 is in reheating combustion of the hot water of the bath 2 being circulated is initiated by a circulation pump 15 is ignited (S25), the detection signal from the thermistor TH ₁ bath temperature 2 T its combustion is continued until _2, the Wakiagari temperature when it reaches _{T 2} (S26: "YES") in the amount of time spent in the combustion _{(t 1)} is measured (S27). Thereafter, the gas burner 12 is stopped extinguished by reheating the combustion (S28), then reheating output is changed to _{Q-Q 1} (S29). The time taken for reheating "t _1" is stored in the time memory area of the RAM of the controller 50 in S27 in the foregoing, Ru is used as the data for calculating the amount of hot water will be described later.
[0025]
Next, the circulation pump 15 of the internal circulation path 11 is turned on again (S30), and the hot water temperature (T ₃ ) is measured by the detection signal from the thermistor TH _{1 in} a state where the hot water temperature in the bathtub 2 becomes uniform ( S31), thereafter reheating output Q-Q ₁ by the tub 2 hot water gas burner 12 is output changes described above is ON again circulating the heating unit 10 is reheating combustion again (S32), the thermistor TH is also at this time the detection signal from ₁ to the hot water temperature tub 2 becomes T ₄ the combustion is continued.
[0026]
Then, the time (t ₂ ) required for the combustion at the time when the boiling temperature reaches T ₄ (S33: “YES”) is measured (S34). The hot water temperature (T ₃ ) measured in the above-described S31 is stored in the temperature memory area of the RAM of the controller 50, while the time “t ₂ ” required for chasing measured in S34 is the time memory of the RAM. each is stored in the area Ru is used as the operation data to be described later of the remaining hot water.
[0027]
Hidden temperature data _{"T 1"} of the lever these, _{"T 2", "T 3", "T 4",} and the time data _{"t 1"} remaining in the bathtub 2 based on the _{"t 2"} hot water _{(W 1} ) Is calculated (S35), the amount of insufficient hot water is determined from the calculated amount of remaining hot water (W ₁ ), and hot water is supplied for that amount of hot water (S36 ).
[0028]
Calculation of the remaining hot water (W ₁₎ in the real施例this, the number of the next 1, obtained by solving the simultaneous equations of equation number 2. That is, the number 1 relational expression holds the operating state of S23~S27 in the control flowchart shown in FIG. 2 described above, the relational expression Equation 2 is satisfied in the operating conditions of S30～S35.
[0029]
[Equation 1 ]

[0030]
[Equation 2 ]

[0031]
In these formulas 1 and 2 , the initial tracking output per unit time is “Q”, and the changed tracking output per unit time is “QQ ₁ ”. For other symbols, the specific heat is “C”, the remaining amount of hot water in the bathtub is “W ₁ ”, the amount of heat released from the bathtub piping (per unit time) is “H”, and the temperature is raised from “T ₁ ” to “T ₂ ”. The time is “t ₁ ”, the water supply amount in the middle is “W ₂ ”, and the time to boil from the temperature “T ₃ ” to “T ₄ ” is “t ₂ ”.
[0032]
And so in FIG. 3 when indicating these equations 1 and 2 of the formula in the graph. The horizontal axis represents t / ΔT, and the vertical axis represents the remaining amount of hot water (W) in the bathtub. As this is shown in Figure 3, the number 1 (1) and (2) of (2) is a linear function passing through the origin both "a" and (1) of the slope, (2 ) If the slope of the equation is “b”,
[0033]
a = (Q−H) / C,
b = (Q−Q ₁ −H) / C = a−Q ₁ / C
It becomes. Therefore, when the expressions ( 1 ) and ( 2 ) are rewritten, the following equations 3 and 4 are obtained.
[0034]
[Equation 3 ]

[0035]
[Equation 4 ]

[0036]
In equation ( 3 ), when t / ΔT is t ₁ / (T ₂ −T ₁ ), in equation ( 4 ), the amount of remaining hot water (W) is W ₁ when t ₂ / (T ₄ −T ₃ ). Therefore, the slope a is obtained from this condition, and W ₁ is obtained. This is as shown in Equation 5 below.
[0037]
[Equation 5 ]

[0038]
Thus, as shown in the real施例described above, and reheating previously twice upon to pouring into the bathtub, a measurement equation at the remaining hot water presents two by changing the reheating output therebetween, the The remaining amount of hot water in the bathtub is calculated by solving simultaneous equations of two arithmetic expressions.
[0039]
Therefore, the amount of remaining hot water in the bathtub can be accurately grasped without being affected by the change in the outside air temperature or the difference in the amount of heat released from the bathtub or piping, and the required amount of hot water can be poured correctly.
In addition, this invention is not limited to the said Example at all, Of course, a various change is possible in the range which does not deviate from the meaning of this invention.
[0040]
【The invention's effect】
As is apparent from the above description, according to the bath with water heater of the present invention, when the hot water is supplied to the bathtub, the amount of remaining hot water in the bathtub can be accurately measured without being affected by heat radiation from the bathtub or piping or the outside air temperature. Since it is possible to calculate and accurately grasp the amount of added hot water, there is no possibility that the amount of hot water supply is too much or too little. Therefore, the user can always use a hot water supply of a desired amount without being affected by seasonal fluctuations in winter and summer, and is very convenient.
[Brief description of the drawings]
FIG. 1 is a view showing a schematic configuration of a bath with a hot water supply according to an embodiment of the present invention.
2 is a control flowchart according to the actual施例of the present invention applied to a water heater with bathtub illustrated in FIG.
3 is a diagram for explaining the basis for calculating the tub remaining hot water based on the control flowchart shown in FIG.
[Explanation of symbols]
1 Bathtub with water heater 2 Bathtub 10 Circulation heating unit 15 Circulation pump 18 Thermistor (TH ₁ )
30 Water heater section 44 Water supply valve (BHV)
50 controller

Claims (1)

A hot water supply system for supplying hot water heated by a water heater to the bathtub, and a memorial circulation heating system for circulatingly heating the hot water in the bathtub for recollection,
Means for additionally fired heating hot water temperature T ₂ from the remaining hot water temperature T ₁ of the hot water in the add焚出force Q early in the bathtub by the add-fired circulating heating system,
Means for additionally fired reheated T ₄ from the hot water T ₃ in the bathtub by changing the add焚出force Q-Q _1,
The rising temperature (T ₂ -T ₁ , T ₄ -T ₃ ) of the hot water in the bathtub heated at least by these means, the time required for the temperature rise (t ₁ , t ₂ ) , the memorial change output (Q ₁ ) A means for calculating the amount of remaining hot water in the bathtub based on the information of ₁ ) , characterized in that a shortage of hot water is added into the bathtub based on the amount of remaining hot water determined by the calculating means. A hot water heater with a water heater.

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