JP2990932B2 - How to reheat a bath - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reheating a bath in which bath water is circulated through a bath kettle to reheat the bath water.

[0002]

2. Description of the Related Art Conventionally, in a bath apparatus for forcibly circulating bath water in a bath to reheat the bath, the bath temperature is controlled so as to reach a set temperature. The abilities were generally constant.

[0003]

However, when the circulating bathtub water is heated with a constant capacity by the bathtub, the temperature of the bathtub may be significantly higher than that of the warm bath from the beginning of reheating, depending on the temperature in the bathtub. There was a problem that different hot water came out and made bathers uncomfortable.

Accordingly, the present invention solves the above-mentioned drawbacks of the prior art, prevents hot water from circulating in the bathtub when a bather is present, and provides a bath for the bather to comfortably take a bath. The purpose of this is to provide a method for reheating.

[0005]

Means for Solving the Problems To achieve the above object, a one-can two-circuit water heater of the present invention forcibly circulates bath water through a circulation circuit to a bath kettle and exchanges heat in the bath kettle. This is a method for reheating a bath in which heated hot water is returned to the bathtub.When the reheating switch is turned on when there is a bather in the bathtub, the reheating is performed when there is no bather in the bathtub. together to perform the temperature switching of burning switch through the circulating path than when turned into hot water of high temperature is discharged into the tub gradually and practice bath set temperature T _S
Calculate the temperature difference X from the bath temperature T of the
The longer the time required to switch the temperature to the higher temperature
It is characterized in that as a.

[0006]

When the reheating switch is turned on, the bath water is circulated to the bath, heated and circulated in the bath. On this occasion,
The hot water discharged into the bathtub slides and switches to a temperature higher than the original bathtub water temperature. If this change is made in a short time, hot water will suddenly come out. On the other hand, when the switching is performed gradually, the temperature changes gradually. If there is a bather, by gradually switching the temperature of the hot water discharged into the bath to a high temperature, it is possible to prevent the hot water from suddenly hitting the bather, Comfortable bathing can be guaranteed.
In particular, in the present invention, when a person is taking a bath,
When the switch is turned on, the bath set temperature T _S at that time is
Calculate the temperature difference X from the actual bath temperature T and calculate the temperature difference X
The longer the temperature, the longer the time required for switching to the higher temperature
By taking the time into consideration,
And had little adverse effect on bathers
Eliminates adverse effects such as switching to high temperature
Appropriate temperature switching according to the degree of impact on bathers
Can be made possible.

[0007]

1 is a schematic block diagram of a bath apparatus showing a first embodiment of the method of the present invention. FIG. 2 is a flowchart showing an example of control by a controller. FIG. 3 is a time chart for explaining the switching timing of a three-way valve. It is a chart.

A bathtub 20 with a hot water supply function is provided for the bathtub 10. The bath kettle 20 has a two-circuit can body 21 in which one can is provided with a hot water supply circuit 22 and a heat exchange coil 31 of a circulation circuit 30 for bath circulation heating. 23 is a burner, 24 is a hot water storage section, and 25 is a combustion section. The circulation circuit 30 exits from the circulation fitting 11 of the bathtub 10 and the heat exchange coil 31 of the can 21
And returns to the circulation fitting 11 again, bypassing halfway
32 are provided. The bypass 32 is provided with a three-way valve 33. The circulation circuit 30 includes a circulation pump 34, a bath temperature sensor 35, and a bath water level sensor 36.
Reference numeral 40 denotes a controller for the bath kettle 20, which incorporates a microcomputer and inputs commands from a remote controller 50 and signals from a bath temperature sensor 35, a bath water level sensor 36, and other sensors, and performs a predetermined control operation according to a predetermined program. The burner 23,
Command the circulation pump 34, the three-way valve 33 and others.

Referring to FIGS. 2 and 3, a method of reheating a bath by the controller 40 will be described. Now, when the operation switch of the bath kettle 20 is turned on, the bath water level sensor 35 constantly monitors the water level of the bathtub 10 from the start of the operation, and
Enter the water level information in 40. Controller 40 is a water level sensor
It is always monitored whether or not the bath water level inputted from 35 rises (increases) rapidly (S1). For example, if the water level increases by several centimeters or more within several seconds (Yes in S1), a person enters the bathtub 10. It is determined to be in the state, and is stored in the ram of the microcomputer of the controller 40. Further, when the bath water level suddenly decreases and when the bath water level does not rise (increase) rapidly (No in S1), it is determined that no person is in the bathtub 10, and this is determined by the microcomputer of the controller 40. To memorize.

When the bath water level rises sharply, while monitoring whether the water level suddenly decreases from that state (S8), it is monitored whether the reheating switch of the remote controller 50 is turned on (S2). When turned on, first, the bath set temperature T _S set by the remote controller and the bath temperature sensor
The difference X from the bath temperature T due to 35 is calculated (S3), and the required time t for switching the passage from the bypass 32 side of the three-way valve 33 to the heat exchange coil 31 side is changed according to the degree of the difference X. I do. That is, the smaller the temperature difference X, the shorter the required switching time, and the larger the difference X, the longer the required switching time. In the embodiment, there are three stages. Comparing the difference between X constant value A, B and (A <B) (S4) , the difference X is set to t ₁ the switching time required for the three-way valve 33 in the case of less than A (S5),
If the difference X is greater than or equal to A and less than or equal to B, the time required for switching the three-way valve 33 is set to t ₂ (S6).
The time required for switching in 33 is set to t ₃ (S7). Each of t ₁ , t ₂ , and t ₃ is a fixed time, and t ₁ <t ₂ <
An appropriate time to be t ₃ is set in advance and stored.
As the temperature difference X is larger, the temperature of the hot water in the bathtub 10 is lower, so that the bather feels the discharge of the hot water. Therefore, the switching time is lengthened and the temperature is gradually increased to prevent sudden hot water from being applied to the bather. When the temperature difference X is small, the hot water in the bathtub 10 is also relatively hot, so the difference between the hot water temperature and the temperature of the discharged hot water is small, and the bather does not feel hot water suddenly. It is doing.

In the above description, the time required for switching the three-way valve 33 when it is determined that a person is in the bathtub 10.
_1, t _2, t ₃ are all people are longer than the switching time required t ₀ of the three-way valve 33 when not in bath 10. By making it longer, the three-way valve 33 gradually switches,
Meanwhile, the temperature of the hot water discharged into the bathtub 10 gradually increases. In the above S1, when the bath water level rapidly decreases and when the bath water level does not rise (increase) rapidly (No in S1), or when the bath water level rapidly decreases in S8 (Yes in S8). include, but people are judged not in the bathtub 10, when the reheating switch of the remote controller 50 in this state is turned on (S9), the controller 40 switches the three-way valve 33 to the immediate (required time t ₀₎ ( S10). Therefore, in this case, hot water passing through the heat exchange coil 31 immediately after
Will circulate to 10.

FIG. 4 is a schematic configuration diagram of a bath apparatus showing a second embodiment of the method of the present invention. FIG. 5 is a flowchart showing an example of control by a controller. FIG. 6 is a time chart for explaining the timing of switching the capacity of the electromagnetic pump. It is.

In the second embodiment, fuel is supplied to a burner 63 provided in a can body 61 of a bath kettle 60 by an electromagnetic pump 66 whose capacity can be switched between large and small. The circulation circuit 70 is not provided with a bypass or a three-way valve. The circulation circuit 70 exits from the circulation fitting 11 of the bathtub 10,
After passing through the heat exchange section 71 in the can body 61, it returns to the circulation fitting 11 again,
A circulation pump 74, a bath temperature sensor 75, and a bath water level sensor 76 are provided on the way. In addition, the controller 80 with a built-in microcomputer is controlled by a command from the remote controller 90 and the bath temperature sensor 7.
5. Input signals from the bath water level sensor 76 and other sensors, and instruct a predetermined control operation to the electromagnetic pump 66, the circulation pump 74, etc. of the burner 63 according to a predetermined program.

Referring to FIGS. 5 and 6, a method of reheating a bath by the controller 80 will be described. Step S11, S
The flow up to 12, S13, S14, S18, and S19 is the same as in the first embodiment described with reference to FIG. In the present embodiment, the temperature difference X when the person is determined to be in the bathtub is determined.
(S11, S12, S13, S14), the timing for switching the capacity of the electromagnetic pump 66 is changed.
That is, the difference if X is less than A, it is turned on burning switch follow, first the electromagnetic pump 66 starts operating at capacity small, so that switching to the large ability after a certain time t ₁ (S1
Five). If the difference X is less than A B In the case where the capability ₂ hours after t after driving the electromagnetic pump 66 large cities (S16), the difference X exceeds B first with the ability small by turning on the reheating switch chase firing switch after starting the operation of the electromagnetic pump 66 by switching on the ability of small after t ₃ hours on a large (S17). The smaller the temperature difference X is, the more the electromagnetic pump
The time required to switch from the small capacity to the large capacity of 66 is short, and the larger the difference X is, the longer the time is. Note that constant values A and B
Is A <B, and t ₁ , t ₂ , and t ₃ are constant times, respectively.
a _{t 1 <t 2 <t 3} .

[0015] On the other hand, (No in S11, yes in S18) if the person is determined to be not a person enters the bathtub, and Reheating switch is turned on in the immediate t ₀ the electromagnetic pump 66 from the beginning Start operation with high capacity. If no person is present, even if hot water is discharged into the bathtub from the beginning, there is no particular problem, and reheating is performed as fast as that much. The switching of the capacity of the electromagnetic pump 66 can be made linear in accordance with the temperature difference X. In addition, the bath kettle 60 may have other functions such as a hot water supply function and a hot water filling function.

[0016]

According to the method for reheating a bath according to the first aspect of the present invention, the bath water is forcibly circulated through the circulation circuit to the bath, and the inside of the bath is heated. a bath reheating method to return the hot water heated by heat exchange in the bathtub, when Reheating switch when there are bather in the bath is turned oN, the bather is not in the bathtub In such a case, the temperature of the hot water discharged into the bathtub through the circulation path is gradually switched to a higher temperature than when the reheating switch is turned on. Hot water can be prevented from suddenly circulating in the bathtub and hitting the bather, so that the bather can be assured of comfortable bathing. In addition, when there is no bather, switching to a high temperature is quick, so that reheating can be performed smoothly. Especially in the present invention, a person is taking a bath
If the reheating switch is turned on,
Performs temperature difference X between bath set temperature T _S and actual bath temperature T
The larger the temperature difference X, the higher the temperature
Bathing is done by changing the time required for replacement to a long time
With sufficient consideration for the elderly and little adverse effect on bathers
Nevertheless, switching to high temperature is slow
Eliminating adverse effects such as
Appropriate temperature switching can be enabled.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bath apparatus showing a first embodiment of the method of the present invention.

FIG. 2 is a flowchart illustrating an example of control by a controller.

FIG. 3 is a time chart for explaining a switching timing of a three-way valve.

FIG. 4 is a schematic configuration diagram of a bath apparatus showing a second embodiment of the method of the present invention.

FIG. 5 is a flowchart illustrating an example of control by a controller.

FIG. 6 is a time chart for explaining the timing of switching the capacity of the electromagnetic pump.

[Explanation of symbols]

 10 Bathtub 20 Bath kettle with water heater function 21 Can body 30 Circulation circuit 40 Controller 50 Remote control 32 Bypass 33 3-way valve 60 Bath kettle 61 Can body 66 Electromagnetic pump 70 Circulation circuit 80 Controller 90 Remote control

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-233259 (JP, A) JP-A-2-6951 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24H 1/00 602

Claims (1)

(57) [Claims] 1. A method for reheating a bath in which bath water is forcibly circulated through a circulation circuit through a bath, heat exchanged in the bath and heated water is returned into the bath. in the case of reheating switch is turned on when there are a bather, hot water of the hot discharged into the tub through the circulation path than if the reheating when bather in the bath is not switch is turned on Gradually switch the temperature to
In addition, the temperature between the bath set temperature T _S and the actual bath temperature T
The difference X is calculated, and the larger the temperature difference X is, the higher the temperature is.
A method for reheating a bath, wherein the time required for temperature switching is set to be long .