JP4002371B2 - Bath device with water heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bath device with a water heater, and more particularly to a bath device with a water heater that uses a common proportional valve for adjusting the fuel supply to the hot water burner and the bath burner.
[0002]
[Prior art]
In general, in a bath apparatus with a water heater equipped with a water heater and a bath tub (memorial device), in order to reduce the number of parts, reduce the product cost, and reduce the size of the apparatus, It is known that a common proportional valve is used to adjust the gas supply amount. During simultaneous combustion of each burner, the temperature control of the water heater is prioritized to determine the opening of the proportional valve and supply gas to each burner. Some control the hot water supply temperature to a predetermined temperature.
[0003]
[Problems to be solved by the invention]
However, in such a bath apparatus with a hot water heater, when the hot water supply operation and the memorial operation are performed simultaneously, the opening of the proportional valve is controlled in accordance with the hot water supply operation. The amount of gas also decreases with this, and becomes smaller than when the bath is operated alone. Therefore, in this case, the amount of heating in the bath is reduced, and particularly when the bathtub water is cold, the temperature of the circulating water heated by the heat exchanger of the bath is not so high, so that Was cooled by the bath heat exchanger and condensed, generating drainage.
Therefore, as shown in the flowchart of FIG. 4, the hot water heater with a pursuit function known from Japanese Patent Publication No. 2501050 may cause condensation on the bath heat exchanger during simultaneous combustion of the hot water burner and the bath burner. When it is determined that there is (S11), the bath burner is extinguished and the memorial operation is stopped (S12), and the bath burner is not combusted until the hot water supply operation is stopped (S13) to prevent condensation. .
However, this hot water heater has a problem that the hot water in the bathtub keeps cooling during the hot water supply waiting time during the hot water supply operation, and it takes time for the hot water.
Then, the bath apparatus with a hot water heater of this invention aims at solving the said subject, preventing condensation, and shortening a memorial time.
[0004]
[Means for Solving the Problems]
The bath apparatus with a hot water heater according to claim 1 of the present invention for solving the above problems
A water heater that heats and controls the water to reach the target temperature by the combustion heat of the hot water burner;
A bath pot that circulates and heats the bath water using the combustion heat of the bath burner;
A hot water on / off valve that opens and closes a fuel supply path to the hot water burner;
A bath open / close valve that opens and closes the fuel supply path to the bath burner;
A common proportional valve that adjusts the amount of fuel to each burner according to the energization amount,
In the case of burning each burner at the same time, in the bath apparatus with a hot water heater that adjusts the fuel amount with the proportional valve in preference to the heating control of the water heater,
Condensation determination means for determining whether or not there is a possibility of condensation in the bath pot when simultaneously burning the burners,
When it is determined by the dew condensation determining means that there is a possibility of dew condensation in the bath pot, the combustion of the bath burner is temporarily stopped, the combustion of the bath burner is resumed after a predetermined time, and the dew condensation determination is performed again. The gist is to determine by means.
[0005]
Moreover, the bath device with a water heater according to claim 2 of the present invention is the bath device with a water heater according to claim 1,
If the fuel amount to the hot water supply burner exceeds a predetermined value or the combustion of the hot water burner stops within the predetermined time during which the combustion of the bath burner is stopped, the bath does not wait for the predetermined time to elapse. The gist is to resume burner combustion.
[0006]
Moreover, the bath apparatus with a water heater according to claim 3 of the present invention is the bath apparatus with a water heater according to claim 1 or 2,
The gist of the dew condensation determination means is based on the hot water temperature heated in the bath.
[0007]
Moreover, the bath apparatus with a water heater according to claim 4 of the present invention is the bath apparatus with a water heater according to claim 1 or 2,
The gist of the dew condensation determination means is based on the combustion amount of the bath burner and the hot water temperature from the bathtub.
[0008]
In the bath device with a hot water heater according to claim 1 of the present invention having the above configuration, in the case of simultaneous combustion of the hot water burner and the bath burner, the opening of the common proportional valve is set in accordance with the amount of fuel to the hot water burner. Control. When this opening degree is small, the amount of fuel to the bath burner also decreases accordingly, the temperature of the bath heat exchanger decreases, and water vapor in the combustion exhaust tends to condense.
When it is determined by the dew condensation determination means that there is a possibility of dew condensation in the bath tub, the bath open / close valve is temporarily closed to stop the combustion of the bath burner to prevent dew condensation.
After a predetermined time has passed, there is almost no water vapor in the vicinity of the bath heat exchanger, and it returns to a state where it is difficult to condense, so even if the hot water burner is in operation, the combustion of the bath burner is resumed and memorialized, The determination by the dew condensation determination means is repeated again.
[0009]
In addition, the bath apparatus with a hot water heater according to claim 2 of the present invention having the above-described configuration stops the combustion of the bath burner when the condensation determination means determines that there is a possibility of condensation in the bath pot. Condensation is prevented, but if the amount of fuel supplied to the hot water burner exceeds the specified value during the specified time when the combustion of the bath burner is stopped, the opening of the common proportional valve is sufficiently large. However, since the amount of fuel to the bath burner increases, it becomes difficult for the bath to condense.
On the other hand, if combustion of the hot water supply burner stops during the predetermined time when the combustion of the bath burner is stopped, even if the combustion of the bath burner is resumed, the opening of the common proportional valve will match the amount of fuel to the bath burner. Since it is set, the amount of fuel to the bath burner can be increased, and it is difficult for the bath kettle to condense.
Thus, if it becomes difficult to condense, it is not necessary to wait for a predetermined time to elapse, and the memorial operation can be started immediately.
[0010]
Moreover, the bath apparatus with a hot water heater according to claim 3 of the present invention having the above-mentioned configuration has a low temperature at which the bath is easily dewed from the temperature of the circulating water heated in the bath by the dew condensation determining means. It is determined whether or not.
[0011]
Moreover, the bath apparatus with a hot water heater according to claim 4 of the present invention having the above-described configuration is at a low temperature at which the bath kettle is likely to condense from the combustion amount of the bath burner and the hot water temperature from the bathtub by the dew condensation determination means. Judge whether it is.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the bath apparatus with a hot water heater of the present invention will be described below.
FIG. 1 shows a bath device with a hot water heater (hereinafter referred to as a bath device) as one embodiment, and this bath device is roughly composed of a bath circuit 40 and a hot water supply circuit 50.
The bath circuit 40 sends a bath heat exchanger 42 that heats the water in the bathtub 20, a return pipe 46 that sends the bath water to the bath heat exchanger 42, and forwards the bath water heated by the bath heat exchanger 42 to the bathtub 20. A circulation heating circuit is formed with the pipe 47, and a bypass pipe 34 that connects the return pipe 46 and the forward pipe 47 and bypasses the bath heat exchanger 42 is provided.
The return pipe 46 is provided with, in order from the upstream side, a bath water thermistor 24 that detects hot water temperature before reheating, a circulation pump 22 that circulates bathtub water, and a water flow switch 23 that confirms the flow of the circulating water.
On the other hand, the outgoing pipe 47 is provided with a bath hot water thermistor 25 that detects the hot water temperature after reheating in the vicinity of the bath heat exchanger 42.
The bath heat exchanger 42 is provided above the combustion chamber 49 and is heated by the bath burner 41.
[0013]
On the other hand, in the hot water supply circuit 50, in order from the upstream side, a flow rate sensor 26 that detects the amount of incoming water, a hot water supply and incoming water thermistor 27 that detects the incoming water temperature, a water amount control motor 28 that adjusts the water flow rate so as to obtain a set hot water temperature, A hot water supply heat exchanger 52 for heating the water flow and a hot water supply heat exchanger outlet thermistor 12 for detecting the hot water temperature after the heat exchange are provided. The hot water supply heat exchanger 52 is provided above the combustion chamber 59 and is heated by the hot water supply burner 51. The hot water supply burner 51 includes three sets of burners having different combustion capacities, and the burner that burns is switched according to the amount of combustion.
[0014]
Further, the hot water supply circuit 50 is provided with a bypass passage 36 that connects the upstream and downstream of the hot water supply heat exchanger 52, and a bypass valve 14 that opens and closes the bypass passage 36. Downstream of the bypass passage 36, a hot water supply and hot water thermistor 15 that detects the temperature of the hot water mixed with the water passing through the bypass passage 36 and the hot water after heat exchange is provided. This downstream flow path branches into a general hot water supply pipe 37 communicating with the hot water supply curan 21 of the kitchen and a dropping pipe 30 for supplying hot water to the bathtub 20.
The dropping pipe 30 connects the hot water supply circuit 50 and the bath circuit 40. The dropping solenoid valve 31 that opens and closes the dropping pipe 30 and the dropping flow rate that detects the flow rate from the hot water supply circuit 50 to the bath circuit 40 in order from the upstream side. A sensor 32 and two check valves 33 for preventing backflow are provided.
[0015]
The hot water supply circuit 50 and the bath circuit 40 are each provided with a common air supply duct 35 serving as a supply path for combustion air, and the air is supplied to the combustion chamber 49 on the bath side by one fan 18 driven by the fan motor 19. It is simultaneously supplied to the combustion chamber 59 on the hot water supply side.
In addition, the gas flow path is provided with an original solenoid valve 10 for opening and closing the gas flow path and a proportional valve 11 for controlling the gas amount according to the energization amount in order from the upstream side, and the hot water supply side gas flow path on the downstream side. And branch to the bath-side gas flow path. On the hot water supply side, hot water supply electromagnetic valves 55, 56, and 57 for independently opening and closing the gas flow paths to the three sets of burners are provided, and independent combustion control is performed. On the other hand, a bath electromagnetic valve 45 for opening and closing the bath side gas flow path is provided on the bath side.
The bath burner 41 and the hot water supply burner 51 are provided with electrodes 43 and 53 for igniting a gas by the operation of the igniter 13 and frame rods 44 and 54 for detecting a combustion flame. Are connected to each other to perform predetermined control such as hot water, reheating, and stopping. The controller 9 includes a microcomputer as a main part.
[0016]
The bath remote control 48 includes a hot water supply switch for starting hot water supply, an increase / decrease switch for increasing / decreasing the target hot water temperature, a display for displaying a set hot water temperature and a set time / time, etc. Operation buttons such as an automatic bath switch that keeps the temperature constant, an afterglow switch that drives circulating water up to 1 to 2 ° C higher than the set temperature, and an additional hot water switch that adds 20 liters of hot water at the set temperature to the bathtub Is installed on the bathroom wall.
On the other hand, the hot water remote controller 58 is also provided with an automatic bath switch or the like and installed on the kitchen wall.
[0017]
Next, the general hot water supply operation will be described.
When the hot water supply currant 21 is opened, the water flowing in from the water inlet flows toward the hot water supply heat exchanger 52. When the water flow rate reaches a predetermined amount by the flow sensor 26, pre-purging is performed by the rotation of the fan 18, and then the hot water supply burner 51 is ignited to start proportional control.
The hot water temperature is kept constant by continuously changing the gas amount by opening / closing each of the hot water solenoid valves 55, 56, 57 and the proportional valve 11. Moreover, since the water amount control motor 28 adjusts the water amount to an appropriate amount, the maximum amount of hot water is always secured.
When the hot water supply currant 21 is closed, the water flow operation is detected by the flow sensor 26, the gas supply is stopped and the fire is extinguished, and the fan 18 is stopped after the post-purge operation.
[0018]
Next, the automatic hot water supply operation | movement to the bathtub 20 is demonstrated.
When the bath automatic switch of the bath remote controller 48 or the hot water remote controller 58 is pressed, the drop solenoid valve 31 is turned ON. After the water flow is detected, the hot water burner 51 performs a hot water combustion operation by proportional control. The hot water is supplied to the bathtub 20 through the check valve 33.
When the amount of water detected by the drop flow sensor 32 reaches the set water amount, the drop solenoid valve 31 is turned OFF, the hot water supply combustion is stopped, the circulating pump 22 of the bath circuit 40 is driven, the hot water temperature is checked, and until the set temperature is reached. Circulate heating and sound a notification buzzer (not shown) to notify the completion of filling.
[0019]
After filling with hot water, the heat transfer control is performed, and the circulating pump 22 is operated and stirred at predetermined time intervals. The bath water temperature is checked by the bath water thermistor 24, and if the detected temperature is lower than the set temperature, the fan 18 is rotated. At the same time as supplying gas to the bath burner 41, the bath burner 41 is ignited and the bath heat exchanger 42 is heated to start heating the bath circulating water.
When it is determined that the detected temperature of the bath water thermistor 24 has reached the set temperature, the bath burner 41 is extinguished and the circulation pump 22 is stopped.
[0020]
On the other hand, if not lowered, the operation of the circulation pump 22 is stopped, and only the circulation pump 22 is operated after the interval has elapsed.
That is, the bath water temperature is checked at a predetermined interval (for example, every 10 minutes), and control is performed so as to maintain the bath water temperature at the set temperature by tracking only when a decrease in hot water temperature is detected.
Pressing the automatic bath switch stops all operations.
[0021]
Next, a dew condensation prevention combustion control routine executed by the controller 9 when the hot water supply operation and the chasing operation are performed simultaneously will be described with reference to the flowchart shown in FIG.
This routine starts when the hot water supply operation and the memorial operation are simultaneously performed.
First, it is determined whether or not there is a possibility of condensation by the condensation determination means (S1).
Specifically, the hot water temperature Tout of the circulating water heated by the bath heat exchanger 42 is detected by the bath hot water thermistor 25, and there is a possibility that condensation occurs when the hot water temperature Tout is 45 ° C. or lower for 15 minutes continuously. Is determined.
[0022]
In step 1, it waits until it is determined that there is a possibility of condensation. If it is determined that condensation is possible, the bath solenoid valve 45 is temporarily closed to stop the combustion of the bath burner 41 to prevent condensation (S2). ). Next, after the bath burner 41 is extinguished, it is determined whether or not a predetermined time (15 minutes) has elapsed (S3).
[0023]
When it is determined that the predetermined time (15 minutes) has elapsed, the bath burner 41 is ignited to start the memorial process (S5), and the process returns to step 1. In other words, during this predetermined time of 15 minutes, the combustion exhaust near the bath heat exchanger 42 is exhausted out of the body by the fan 18, and the surface of the bath heat exchanger 42 is dried, and it becomes difficult to condense. The combustion of the bath burner 41 is started.
[0024]
Conversely, when it is determined that the predetermined time (15 minutes) has not elapsed, the gas amount to the hot water burner 51 is converted to the gas amount to the bath burner 41 and is proportional to a predetermined value of 94 kcal / min or more. It is determined whether the current value of the valve or 0 (that is, the hot water supply operation is stopped) (S4).
If it is determined in step 4 that less than a predetermined value of gas is supplied to the hot water supply burner 51 and burning, it is still in a state where condensation is likely to occur, so the process returns to step 3.
On the other hand, if it is determined in step 4 that the amount of gas to the hot water supply burner 51 is greater than or equal to a predetermined value or 0, it is determined that the condensation is difficult to occur, and the bath burner 41 does not wait for 15 minutes. Combustion is restarted, the gas amount of the bath burner 41 is set to a maximum of 107 kcal / min, and the memory is started (S5), and the process returns to Step 1.
That is, the gas amount is controlled by the common proportional valve 11 for both bath and hot water supply, and the hot water supply temperature control is prioritized, and therefore the combustion amount of the bath burner 41 changes according to the combustion amount of the hot water supply burner 51. Thus, based on the gas supply amount of the hot water supply burner 51, it is determined whether or not the bath side has returned to a state where it is difficult for condensation to occur.
In addition, when the water heater is shut down, even if the combustion of the bath burner 41 is resumed, the proportional valve 11 is set to an opening corresponding to the amount of fuel supplied to the bath burner 41. The amount of fuel can be increased, it is difficult for condensation to occur in the bath, and there is no need to wait for a predetermined time (15 minutes) to elapse, and the chasing operation can be started immediately.
[0025]
As described above, the bath apparatus with a hot water heater according to the present embodiment can prevent condensation by stopping the chasing operation and not generating combustion exhaust when it is in a state where condensation is likely to occur, while it is difficult to cause condensation. Returning to, since the memorial operation is started even if the hot water supply operation is performed, the waiting time of the memorial operation is shortened, the hot water in the bathtub 20 is not cooled down much, and the time required for the memorial operation is shortened. can do.
Further, this bath apparatus with a water heater is provided with a fan 18 that simultaneously sends combustion air to the combustion chamber 49 on the bath side and the combustion chamber 59 on the hot water supply side. Min) While waiting, the fan 18 is operating for hot water supply operation, and at the same time, air is sent to the bath heat exchanger 42. As a result, the surface of the bath heat exchanger 42 is dried and is in a state where it is difficult to condense, and the combustion of the bath burner 41 can be restarted at an early stage.
In addition, the dew condensation determination is not performed by measuring the circulating water amount and the incoming water temperature to the bath heat exchanger 42, but is performed by the bath hot water thermistor 25, so that it is simple and accurate.
[0026]
As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement in a various aspect in the range which does not deviate from the meaning of this invention.
For example, as another dew condensation determination method, the bath water thermistor 24 detects the temperature Tin of the return hot water circulated from the bathtub 20, and the amount of gas supplied to the bath burner 41 and the return hot water temperature Tin as shown in FIG. Is within the condensation occurrence region indicated by the hatched portion, the hot water temperature Tout is equivalent to less than 45 ° C., and if this state continues for a predetermined time (for example, 15 minutes), it may be determined that there is a possibility of condensation, It is not necessary to provide the bathing hot water thermistor 25.
Alternatively, there is a possibility that dew condensation may occur when the amount of gas supplied to the bath burner 41 is less than 94 kcal / min and the return hot water temperature Tin is less than 22 ° C. continuously for a predetermined time (for example, 15 minutes). You may determine that there is.
In addition, a fan for sending combustion air to the combustion chamber 49 on the bath side and the combustion chamber 59 on the hot water supply side may be provided separately, but while waiting for a predetermined time (15 minutes) in step 4, the bath side If the fan is operated, the surface of the bath heat exchanger 42 is dried and is not easily condensed, and the combustion of the bath burner 41 can be resumed at an early stage.
The fuel is not limited to gas, but may be liquid such as kerosene.
[0027]
【The invention's effect】
As described above in detail, according to the bath apparatus with a hot water heater according to claim 1 of the present invention, the combustion of the bath burner is stopped based on the determination of the dew condensation determination means, Since the chasing operation is resumed after a lapse of time, the waiting time for the chasing operation is shortened, and accordingly, the time for the chasing operation is shortened, so that comfortable bathing is possible and condensation in the bath pot is prevented. This can improve the durability of the bath.
[0028]
In addition, according to the bath device with a hot water heater according to claim 2, when it becomes difficult to condense in the bath pot, a memorial operation can be started immediately without waiting for a predetermined time to pass and a comfortable bathing can be performed. it can.
[0029]
In addition, according to the bath apparatus with a hot water heater according to claim 3, since the dew condensation is determined based on the hot water temperature heated in the bath tub, it is simple and accurate.
As a result, it is possible to reliably prevent condensation in the bath and further improve the durability of the bath.
[0030]
Moreover, according to the bath apparatus with a hot water heater according to claim 4, the temperature sensor for detecting the bath water temperature can be used as the dew condensation determination means, and the determination of the dew condensation based on the combustion amount of the bath burner and the hot water temperature from the bathtub. Therefore, it is not necessary to newly provide a temperature detection means for determining condensation, which does not lead to an increase in cost.
In addition, it is possible to reliably prevent condensation in the bath and further improve the durability of the bath.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a bath apparatus with a water heater according to the present embodiment.
FIG. 2 is a flowchart showing a dew condensation prevention combustion control routine of the present embodiment.
FIG. 3 is a diagram showing a dew condensation generation region.
FIG. 4 is a flowchart showing a dew condensation prevention combustion control routine of a conventional example.
[Explanation of symbols]
9 ... Controller, 11 ... Proportional valve, 20 ... Bathtub, 22 ... Circulation pump,
25 ... Bath hot water thermistor, 30 ... Drop-in tube, 40 ... Bath circuit,
42 ... Bath heat exchanger, 50 ... Hot water supply circuit.

Claims (4)

A water heater that heats and controls the water to reach the target temperature by the combustion heat of the hot water burner;
A bath pot that circulates and heats the bath water using the combustion heat of the bath burner;
A hot water on / off valve that opens and closes a fuel supply path to the hot water burner;
A bath open / close valve that opens and closes the fuel supply path to the bath burner;
A common proportional valve that adjusts the amount of fuel to each burner according to the energization amount,
In the case of burning each burner at the same time, in the bath apparatus with a water heater that adjusts the fuel amount with the proportional valve in preference to the heating control of the water heater,
Condensation determination means for determining whether or not there is a possibility of condensation on the bath pot when the burners are burned simultaneously,
When it is determined by the condensation determination means that there is a possibility of condensation in the bath pot, the combustion of the bath burner is temporarily stopped, the combustion of the bath burner is resumed after a predetermined time, and the condensation determination is performed again. A bath apparatus with a hot water heater, characterized by determining by means. If the fuel amount to the hot water supply burner exceeds a predetermined value or the combustion of the hot water burner stops within the predetermined time during which the combustion of the bath burner is stopped, the bath does not wait for the predetermined time to elapse. The bath apparatus with hot water heater according to claim 1, wherein combustion of the burner is restarted. The bath apparatus with hot water heater according to claim 1 or 2, wherein the dew condensation determining means determines based on a hot water temperature heated in the bath kettle. The bath apparatus with hot water heater according to claim 1 or 2, wherein the dew condensation determination means determines based on a combustion amount of the bath burner and a hot water temperature from the bathtub.

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