JPH06288616A - Automatic water heater - Google Patents

Abstract

PURPOSE:To make possible the securing of safety of a user by minimizing change in the level of the temperature of hot water delivered from a faucet in the switching of functions for an automatic water heater. CONSTITUTION:When the execution of automatically hot water supplying function is executed. it is judged whether a faucet MK is used or not and when it is used, it is judged whether the present target temperature T0 (second specified hot water temperature T2 of the automatically hot water supplying function) is higher or not than a safety temperature T3 (for example, 45 deg.C free from fear of burn) and when it is higher, the present target temperature T0 is canceled to set the future target temperature T0 of the hot water at a safety temperature T3. When the faucet MK is not used, the target temperature T0 of the hot water is changed to be set to a first specified temperature T1 of the general hot water supplying function set with a remote controller 50. This can minimize a change in the level of the temperature of hot water to be discharged from the faucet MK even when it is used immediately after the end of executing the automatically hot water supplying function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water heater having a structure capable of supplying hot water to a bath, kitchen, washroom or the like through a curran or dropping it into a bathtub through a dedicated path, and especially in any situation. It is related to the improvements that can be avoided from the dangers such as.

[0002]

2. Description of the Related Art Conventionally, there is a general hot water supply function of boiling water in a tap water to supply it to a bathroom, a bathtub, a kitchen or a washroom through a currant, and a function of taking out water from the bathtub and heating it to reheat it for reflux. There is an automatic water heater with a heating function.

[0003] In such a device, a manual or automatic mixing type curran is usually installed in a bathroom, a kitchen, a washroom, etc., so that the hot water temperature discharged from the currant can be set by the user. Appropriate depending on (eg 30 ~
It can be adjusted to 50 ℃. Since this mixing type curran mixes hot water and water in the waterworks (10 to 15 ° C), in the above device, when performing the general hot water supply function, the target hot water temperature, that is, the hot water discharged from the heat exchanger. The temperature is set to a relatively high temperature, such as 50 to 65 ° C.

Further, it is considered that the above-mentioned device is provided with an automatic hot water supply function for filling hot water having a temperature suitable for bathing. In this case, the hot water is dropped into the bathtub through the reflux pipe of the reheating circuit provided in the bathtub. In this case, when executing the automatic hot water supply function,
The target hot water temperature is a relatively low hot water temperature suitable for bathing (for example, 38
The temperature of the target hot water is automatically changed to a relatively high hot water temperature suitable for the general hot water supply function after the execution of the automatic hot water supply function.

As described above, in an apparatus having both functions, the target hot water temperature needs to be changed when the general hot water supply function is executed and when the automatic hot water supply function is executed. It can be adjusted arbitrarily with a controller. Generally, the designated hot water temperature when the general hot water supply function is executed is in the relatively high temperature range of 50 to 65 ° C, and the designated hot water temperature when the automatic hot water supply function is performed is in the relatively low temperature range of 38 to 45 ° C. Often set to fit.

When the general hot water supply function and the automatic hot water supply function are executed in parallel, the designated hot water temperature related to the automatic hot water supply function is preferentially selected as the target hot water temperature.

[0007]

In the above conventional apparatus, when the execution of the automatic hot water supply function is completed, the target hot water temperature is changed from the designated hot water temperature when the automatic hot water supply function is executed to the designated hot water temperature when the general hot water supply function is executed. However, due to the time lag of this change processing, the general hot water supply function is being executed in parallel with the execution of the automatic hot water supply function, and the general hot water supply function will be executed even after the execution of the automatic hot water supply function is completed. When running, the low-temperature hot water set to the designated hot water temperature of the automatic hot water supply function is supplied to the currant. turn into. In response to this, when the user squeezes to "small water supply" with the currant, when the hot water output reaches the changed target hot water temperature (specified hot water temperature for the general hot water supply function),
Since hot water is supplied to the currant, the temperature of the hot water discharged from the currant may be too high.

The present invention was devised in view of such circumstances, and it is intended to secure the safety of the user by reducing the change in hot water temperature of the hot water discharged from the currant when switching the function. With the goal.

[0009]

In order to achieve such an object, the present invention relates to an automatic water heater for selectively supplying introduced water through a heat exchanger to the currant and the bath drop section. It has the following configuration.

The automatic hot water supply apparatus of the present invention comprises a designation means for executing an automatic hot water supply function for filling a bathtub with hot water suitable for bathing,
Setting means for arbitrarily setting the first designated hot water temperature in the general hot water supply function using the currant and the second designated hot water temperature in the automatic hot water supply function, and the setting means set in accordance with the hot water supply function to be executed One of the designated hot water temperatures is set as a target hot water temperature, and a control means for controlling the heating capacity of the heat exchanger is provided, further, the control means,
When switching from the execution of the automatic hot water supply function to the execution of the general hot water supply function, the configuration is such that a relatively low temperature other than the first designated hot water temperature set by the setting means is set as the target hot water temperature.

[0011]

[Function] Since the target hot water temperature is automatically set to the designated hot water temperature according to each hot water supply function, the hot water discharge temperature at the time of hot water supply is adjusted according to the desire of the bather.

When the general hot water supply function is executed in parallel with the execution of the automatic hot water supply function and the general hot water supply function is executed even after the execution of the automatic hot water supply function, the execution of the automatic hot water supply function is completed. As the target hot water temperature later, it is not immediately set to the first designated hot water temperature of the general hot water supply function, but is set to a safe temperature that is not hot, for example. Therefore, even under the special use condition as described above, the hot water discharged from the currant does not reach a temperature that is dangerous to the human body.

[0013]

1 and 2 show an embodiment of the present invention. FIG. 1 is a circuit diagram of the automatic hot water supply device, and FIG. 2 is a flow chart for explaining the operation. The automatic water heater in the example
Suitable for bathing water in a bathtub, a bathtub, a kitchen, or a washroom by boiling water from the tap water, a general hot water supply function, a reheating function that takes out the water in the bathtub, reheats it by heating, and returns it to the bathtub. It is configured to have an automatic hot water supply function for filling hot water at different temperatures.

That is, the automatic water heater of the illustrated example has a hot water supply circuit 10, a bath circulation circuit 20, and a drop circuit 30.
A remote controller 40 and a sequence controller 50 (corresponding to the control means in the claims),
The details will be described below.

The hot water supply circuit 10 is connected to a water inlet pipe 11 connected to water supply, a hot water supply heat exchanger 12, a heating burner 13 for the hot water supply heat exchanger 12, and a mixing-type currant MK such as a kitchen or a washroom. Hot water outlet pipe 14 and water inlet pipe 11
The mixing servo valve 15 for mixing the water from the branch pipe 11a and the hot water from the tap pipe 14 is provided. In the middle of this circuit, an incoming water amount sensor 16, an incoming water temperature sensor 17,
A hot water temperature sensor 18 and a water amount servo valve 19 are provided. The Karan MK mixes and discharges hot water and water at a ratio according to the mixing operation.

The bath circulation circuit 20 has a suction pipe 21 and a reflux pipe 22 each having one end connected to the bath BT, and a bath heat exchanger 23 connected to each of the other ends of the suction pipe 21 and the reflux pipe 22. A circulation pump 24 that takes in water in the bathtub into the suction pipe 21 and sends it to the reflux pipe 22 and a heating burner 25 for the bath heat exchanger 23 are provided. A bath temperature sensor 26, a running water switch 27, and a pressure sensor 28 for detecting the bath water level are provided in the middle of this circuit. The reflux pipe 22 corresponds to the bathtub drop-in portion described in the claims.

The drop-in circuit 30 connects the hot water supply circuit 10 and the bath circulation circuit 20, and has a connection pipe 31.
In the middle of, the drop water amount sensor 32 and the check valve 33
A drop solenoid valve 34 and an overflow chamber 35 are provided. In the overflow chamber 35, the branch pipe 11b of the water inlet pipe 11 of the hot water supply circuit 10 is connected to the water supply solenoid valve 36.
Is connected via the three-way switching valve 3
It is connected to the suction pipe 21 of the bath circulation circuit 20 via 7. The dropping circuit 30 can supply water from the bath circulation circuit 20 to the bath BT by opening the water supply solenoid valve 36 when the temperature of the hot water in the bath BT is too high.

The remote controller 40 has at least an operation switch S1, an automatic hot water supply switch S2, a general hot water supply hot water temperature control switch S3, a bath hot water temperature control switch S4,
It was equipped with a switch S5. The automatic hot water supply switch S2 corresponds to the designating means in the claims, and the general hot water supply temperature adjusting switch S3 and the bath hot water temperature adjusting switch S4 correspond to the setting means in the claims. General hot water temperature and bath hot water temperature are
Although it can be adjusted arbitrarily, it is usually the first for general hot water supply.
The designated hot water temperature T ₁ is set in the range of 50 to 65 ° C, and the second designated hot water temperature T ₂ during automatic hot water supply is set in the range of 38 to 45 ° C.

The sequence controller 50 controls the operation signal input from the remote controller 40 and each circuit 1
0, 20, 30 various sensors and switches (16, 17,
18, 26, 27, 28, 32) based on the detection signals input from the mixing servo valve 15, the water amount servo valve 19, the circulation pump 24, the drop solenoid valve 34, the water supply solenoid valve 36, the three-way switching valve 37, etc. The heating burner 1 of each heat exchanger 12, 23 is controlled while controlling the operation of the movable part.
It controls the ignition and extinction of 3,25. The sequence controller 50 executes a safety function according to the flowchart of FIG. 2 in addition to the general hot water supply function, the automatic hot water supply function, and the additional heating function. The sequence controller 5
0 variably controls the heating capacity of the heating burner 13 of the hot water supply circuit 10 and the heating burner 25 of the bath circulation circuit 20 based on the target hot water temperature T ₀ set according to the function to be executed. Specifically, the gas amount of a gas proportional valve (not shown) connected to the heating burners 13 and 25 is fed forward so that the hot water outlet temperature on the heat exchanger side becomes [(1 + α) Ts−α · Tc]. It is variably set by controlling. In the above equation, Ts is the set temperature, Tc is the feed water temperature, and α is the ratio of the feed water flow rate to the heat exchanger and the water input amount to the mixing servo valve 15.

Next, the operation will be briefly described.

(A) When general hot water supply is performed, the operation switch S1 is operated to open the Karan MK. As a result, the first designated hot water temperature T ₁ which has been set by the general hot water supply hot water temperature adjustment switch S3 is set as the target hot water temperature T ₀ . Then, the amount of water corresponding to the operation amount of the Karan MK is introduced into the hot water supply circuit 10, and accordingly, the water is heated in the hot water supply heat exchanger 12 and supplied to the Karan MK. The heating capacity of the hot water supply heat exchanger 12 is controlled based on the set target hot water temperature T ₀ (T ₁ ).
After that, when the Karan MK is closed, the introduction of water is stopped, the heating burner 13 is extinguished, and the hot water supply operation is completed.

(B) When performing automatic hot water supply, the automatic hot water supply switch S2 is operated. As a result, the second designated hot water temperature T ₂ that has been set by the bath hot water temperature adjusting switch S4 is set as the target hot water temperature T ₀ . Then, as water is introduced into the hot water supply circuit 10, the hot water supply heat exchanger 1
It is heated at 2 and drops into the bath BT through a part of the drop circuit 30 and the bath circulation circuit 20 to be supplied. The heating capacity of the hot water supply heat exchanger 12 is controlled on the basis of the set target hot water temperature T ₀ (T ₂ ). In this way, when the pressure sensor 28 detects that the bath BT is filled with the dropped hot water, the automatic hot water supply operation ends.

(C) When reheating the water in the bathtub, it is sufficient to operate the warm switch S5. As a result, the second designated hot water temperature T ₂ that has been set by the bath hot water temperature adjusting switch S4 is set as the target hot water temperature T ₀ . Then, after confirming that the water flow switch 27 is turned on, the bath circulation circuit 20 is closed by the three-way switching valve 37 and the circulation pump 24 is driven. As a result, the internal water of the bath BT is sucked into the bath circulation circuit 20, and after being heated by the bath heat exchanger 23, the bath BT is heated.
Is returned to. The heating capacity of the bath heat exchanger 23 is controlled based on the set target hot water temperature T ₀ (T ₂ ). When the bath temperature sensor 26 detects that the bath water reaches the target hot water temperature T ₀ , the reheating operation ends.

When the automatic hot water supply function (b) described above ends, the sequence controller 40 executes the safety function shown in FIG.

That is, first, it is determined whether or not the Karan MK is used (step S1). This decision is
This is performed by comparing the amount of water detected by the water input sensor 16 of the hot water supply circuit 10 with the amount of water detected by the water drop sensor 32 of the drop circuit 30. For example, when the comparison results are equal, it is determined that the Karan MK is not used.

When the Karan MK is not used, the first designated hot water temperature T ₁ of the general hot water supply function set by the remote controller 50 is set as the target hot water temperature T _{0 in} step S6, and the process ends. On the other hand, if it is being used, it is determined in step S2 whether or not the target hot water temperature T ₀ (that is, T ₂ ) currently set is higher than the safe temperature T ₃ (for example, 45 ° C. where there is no risk of burns). To do. When it is determined to be high in step S2, step S
In 3, the current target hot water temperature T ₀ is canceled and the future target hot water temperature T ₀ is set to the safe temperature T ₃ , while if it is determined to be low, the current target hot water temperature T ₀ remains unchanged in step S4. It is set as a future target hot water temperature T ₀ . Then, in step S5, the use of the Karan MK is waited for, and when stopped, the target hot water temperature T ₀ is set to the first designated hot water temperature T ₁ of the general hot water supply function set by the remote controller 50 in step S6. Change settings and exit.

As described above, in this embodiment, when the Karan MK is used after the execution of the automatic hot water supply function, the second designated hot water temperature T ₂ of the automatic hot water supply function is set higher than that. Without immediately changing to the first designated hot water temperature T _{1 of the} hot water supply function, check whether the second designated hot water temperature T ₂ actually set when executing the automatic hot water supply function is lower or higher than the safe temperature T _3. In addition, it has a safety function of preventing the hot water discharged from the Karan MK from abruptly changing in height. For this reason,
It is possible to avoid the danger for the bather as described in the conventional example.

[0028]

As described above, according to the present invention,
For example, even if the general hot water supply function is being executed in parallel with the execution of the automatic hot water supply function and the general hot water supply function is being executed even after the completion of the execution of the automatic hot water supply function, the discharge from the karan Since it is possible to prevent the temperature of the hot water from suddenly rising, it is possible to avoid the danger that the hot water discharged from the currant will make the user feel hot. In this way, it is possible to provide an automatic hot water supply device that ensures safety.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of an automatic water heater according to the present invention.

FIG. 2 is a flowchart for explaining the operation in the above embodiment.

[Explanation of symbols]

 BT bathtub 10 hot water supply circuit 12 hot water supply heat exchanger 13 heating burner 20 bath circulation circuit 30 drop circuit 40 remote controller 50 sequence controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Shimizu 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Prefecture Noritsu Co., Ltd. (72) Inventor Saichiro Hato 32 Akashi-cho, Chuo-ku, Kobe Hyogo Prefecture (72) Inventor Toshiya Tatsumura 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Within Noritsu Co., Ltd. (72) Inventor Toshiki Tachibana, 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (72) Inventor Nobutsu Sugawara 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Inventor Hideki Nomura 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (1)

[Claims] 1. An automatic hot water supply device for selectively supplying introduced water to a currant and a bathtub drop-in portion through a heat exchanger, and designating means for executing an automatic hot water supply function for filling hot water suitable for bathing in a bathtub. And setting means for arbitrarily setting the first designated hot water temperature in the general hot water supply function using the currant and the second designated hot water temperature in the automatic hot water supply function, and the setting means according to the hot water supply function to be executed. One of the designated hot water temperatures is set as a target hot water temperature, and the heating means is provided with a control means for controlling the heating capacity of the heat exchanger, and the control means executes the automatic hot water supply function to the general hot water supply function. An automatic hot water supply device having a function of setting a relatively low temperature, which is not the first designated hot water temperature set by the setting means, as a target hot water temperature when switching to.