JP3531508B2 - Bath water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a bath water heater. In particular, it relates to a one-can-two-channel bath hot water supply device in which a heat exchanger for reheating hot water in a bathtub and a heat exchanger for hot water supply are housed in the same can body.

[0002]

2. Description of the Related Art There are two types of bath water heaters, one with two cans and two channels (2 burners), and the other with one can and two channels (1 burner). In the two-can, two-channel type, the heat exchanger for the reheating circuit of the bathtub and the heat exchanger for hot water supply are housed in separate cans and heated by separate burners.
On the other hand, in the one-can-two-channel system, the heat exchanger for the reheating circuit of the bathtub and the heat exchanger for hot water supply are housed in the same can body, and both heat exchangers are heated by the same burner. Is.

As a method of detecting the remaining amount of hot water in the bathtub, there is a method called a calorific value calculation method. This method is a method for detecting the amount of residual water when there is residual water above the level of the bath adapter in the bathtub.By circulating the hot water in the bathtub in the reheating circuit, the preheating temperature of the hot water in the bathtub can be measured. The hot water in the bathtub is heated by the reheating circuit for a certain period of time, and the boiling temperature of the hot water in the bathtub is detected again after the end of the reheating. Combustion capacity of combustion circuit (combustion number)
Since it is known in advance, the residual water content in the bath can be thermodynamically calculated from the temperature difference between the heating temperature and the pre-heating temperature and the combustion time.

Even with a 2 can, 2 canal type bath hot water supply device, 1 can, 2
Even in a waterway type bath water heater, basically, the remaining water amount can be calculated by the heat amount calculation method as described above.
However, in the case of the 2 cans and 2 water channels method, the burner for heating and the burner for hot water supply are separate, so the burner for heating has a constant burning ability during heating and during calorific value calculation. The heat exchanger for heating is continuously heated. Therefore, no matter how many times the bath water temperature changes at the start of heating and the end of heating (for example, 10 ° C, 40 ° C
However, as shown by the broken line in FIG. 1, the combustion capacity of the burner does not change much (stops within an error of about 10 to 20%), and the residual water content can be relatively accurately calculated by calorific value calculation.

On the other hand, in the bath water heater of the one-can-two-channel type, the heat exchanger for hot water supply and the heat exchanger for additional heating are heated by the same burner, so that when using the bath alone, etc. When the hot water in the hot water supply circuit boils when the burner is continuously burned, the burner is intermittently burnt so that the hot water discharged from the hot water supply circuit does not boil. Therefore, as shown by the solid line in FIG. 1, when the temperature of the hot water in the bath changes, the combustion ability of the burner also changes significantly (for example, at a hot water temperature of 40 ° C., 10
The burning ability is reduced by nearly 50% as compared with the case of ℃. ). Further, when the temperature of the hot water flowing into the heat exchanger for additional heating changes, the heat exchange efficiency in the heat exchanger for additional heating also changes. Therefore, if the calorific value was calculated using the specified value (constant value) as the burner's combustion capacity as in the conventional case, the residual water amount in the bathtub could not be accurately calculated by the calorific value calculation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above technical problems, and an object of the present invention is to provide a can with a function of calculating a residual water content by a calorific value calculation method. In the two-channel water bath water heater,
It is to be able to accurately calculate the residual water content by calorific value calculation.

[0007]

DISCLOSURE OF THE INVENTION The bath water heater according to claim 1 is configured to simultaneously heat a heat exchanger for hot water supply and a heat exchanger for additional heating by one combustion appliance, and in a bathtub. comprising a temperature detecting means for detecting the water temperature, based on the hot water temperature in the bathtub that has been detected by said <br/> temperature detecting means determines the combustion capability of the burner used for the residual water amount calculating by heat calculation method The bath water heater that
The controller records the relationship between the temperature of hot water in the tank and the combustion capacity.
It is stored in the storage device and stored in the bathtub using the relationship.
Determines the combustion capacity of the combustion equipment used to calculate the residual water amount from the hot water temperature
It is characterized in that it has to so that.

Here, the residual water amount calculation of the calorific value calculation method is
In this method, the hot water remaining in the bathtub is heated for a predetermined time, and the residual water content is obtained from the temperature difference between the hot water temperature before the start of heating and the hot water temperature after the end of heating, and the amount of heat given to the hot water in the bathtub during that time. Further, in order to determine the combustion ability to use the hot water in the bathtub to the remaining water amount calculating by heat calculation method, previously tub indoor bath temperature and the relationship between the combustion capability of the burner controller memory
I remember it.

[0009] In the bath hot water supply apparatus of the present invention, controller
Bath temperature and combustor stored in roller storage
The burning ability of the burner used for calculating the residual water amount is determined according to the hot water temperature in the bathtub by using the relationship with the burning ability of the utensil, so the burning ability corrected according to the hot water temperature in the bathtub. Can be used, and the amount of remaining water in the bathtub can be accurately obtained by calculating the amount of heat even in the so-called 1-can / 2-channel bath water heater.

According to a second aspect of the present invention, in the bath water heater according to the first aspect, the temperature detecting means is provided.
Therefore, from the detected hot water temperature in the bathtub before and after the start of operation for calculating the remaining water amount, the temperature is stored in the storage device.
Using the above relationship, the burning capacity of the burning appliance before and after the start of operation is obtained, and is detected by the temperature detecting means.
In addition, the relationship stored in the storage device is calculated from the hot water temperature in the bathtub before and after the operation for calculating the remaining water amount.
Used to obtain the combustion capability of the combustion appliance before and after the end of the operation, it is characterized by calculating the amount of remaining water by heat arithmetic method seeking average combustion capacity from both the combustion capability.

In this embodiment, the burning ability of the burning appliance is corrected from the hot water temperature in the bath at the start of the remaining water amount calculation and at the end of the operation of the remaining water amount calculation, and the average burning ability (for example, arithmetic mean) is corrected. ) Is used to calculate the residual water amount in the bath by calorific value calculation, the calculation accuracy of the residual water amount can be further improved by a simple calculation.

Further, the embodiment described in claim 3 is
The bath water heater according to Item 1, wherein the bathtub is at regular intervals
Detects the hot water temperature inside and uses it to calculate the remaining water amount from the detected hot water temperature
Try to find the burning capacity of the burner at each hour
ing. The embodiment described in claim 4 is the same as claim 1
In the bath water heater according to the above paragraph,
Each time the hot water temperature in the bathtub detected by the
In addition, the combustion of the combustion equipment used to calculate the residual water amount from each detected temperature
I try to ask for abilities. As in these embodiments
In addition, the hot water temperature in the bathtub is detected at regular time intervals (or constant temperature changes) and at constant time intervals (or constant temperature changes).
If the calorific value calculation is performed by integrating the values of the combustion ability corrected in the above, the residual water amount can be calculated with higher accuracy.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 2 is a schematic configuration diagram showing a one-can-two-channel type bath water heater 1 according to an embodiment of the present invention. The bath water heater 1 is an oil type that uses oil as a fuel, and a burner 3 for burning the oil is provided above the can body 2, and oil is supplied from an oil supply pipe 4a by an oil pump 5a. The amount of spray is controlled by controlling the amount of return by the control valve 5b arranged in the oil return pipe 4b. Further, a blower 6 for forcibly feeding combustion air is provided above the can body 2.
The air, exhaust gas, and the like forcedly blown from the exhaust pipe 7 are discharged to the outside from the exhaust pipe 7. Further, in the can body 2, there are arranged a reheating heat exchanger 9 of a reheating circuit 19 connected to a bath adapter 29 of a bath 28 and a hot water supply heat exchanger 8 provided in a hot water supply passage 11. There is.

The hot water supply passage 11 comprises an inlet water passage 11a connected to the inlet side of the heat exchanger 8 for hot water supply and an outlet passage 11b connected to the outlet side thereof. The inlet passage 11a has a flow rate sensor 10 and an inlet temperature sensor. 12, a hot water outlet temperature sensor 13 and a flow rate adjusting valve 14 are provided in the hot water outlet 11b. Further, a bypass passage 17 having a bypass flow rate adjusting valve 18 is provided between the water inlet passage 11a and the hot water outlet passage 11b, and the hot water supply heat exchange is provided downstream of the confluence of the hot water outlet passage 11b with the bypass passage 17. A mixing temperature sensor 15 is provided for detecting a mixed temperature of hot water heated in the vessel 8 and water that has passed through the bypass 17. Then, when the curran 16 provided at the pipe end of the hot water supply passage 11b is opened, the water flowing through the hot water supply passage 11 is heated by the hot water supply heat exchanger 8 heated by the burner 3, and the bypass passage 17
Karan 1 as hot water of the set temperature mixed with water that has passed through
Hot water is discharged from 6.

The reheating circuit 19 comprises a return pipe 19a and a forward pipe 19b connected to the reheating heat exchanger 9, and the circulation pipe 20 and the bath water temperature detection sensor 2 are provided in the return pipe 19a.
1. A water flow switch 22 is provided. Then, when reheating the hot water in the bathtub 28, the circulation pump 20 is operated to confirm that there is hot water at the bath adapter level or higher by the circulation judgment, and then the reheating for the hot water heated by the burner 3 is performed. The bath 28 which is heated by the heat exchanger 9 to circulate the hot water circulating in the reheating circuit 19 and is detected by the bath temperature detecting sensor 21.
When the temperature of the hot water inside reaches the set temperature, the operation of the circulation pump 20 is stopped.

The hot water drop path 23 branching from the pipe end portion of the hot water supply path 11b of the hot water supply path 11 is connected to the middle of the forward pipe 19b of the reheating circuit 19 via the drop opening / closing valve 24 and the check valve 25. Cage, return pipe 19b and return pipe 1
A bypass passage 26 having a check valve is provided between the bypass passage 26 and 9a. When the hot water is dropped into the bathtub 28 and the hot water is poured into the bathtub 28, the drop on-off valve 2
4, the hot water heated by the hot water supply heat exchanger 8 in the hot water supply path 11 is poured into the reheating circuit 19 through the hot water drop path 23, and the forward pipe 19b and the return pipe 19a are passed through the bypass flow passage 26 having the check valve 27. The hot water is dropped into the bathtub 28 from the bus adapter 29 by both transports.

Next, a description will be given of the remaining water amount determination by the calorific value calculation method in the bath water heater 1 of such a one-can-two-channel method. In this bath water heater 1, the bath water temperature detecting sensor 21 provided in the reheating circuit 19 detects the temperature of the hot water returning from the bath 28 to the reheating heat exchanger 9, that is, the hot water temperature in the bath 28. There is. Between the hot water temperature in the bathtub 28, which is measured by the bathtub hot water temperature detection sensor 21, and the amount of heat given from the burner 3 to the postheating heat exchanger 9 or the burning capacity (burning capacity) of the burner 3. For example, there is a correlation as shown by the solid line in FIG. This correlation can be obtained experimentally. Therefore, the hot water temperature in the bathtub 28 measured by the hot water bath temperature detection sensor 21 is
For example, the combustion capacity of the burner 3 is measured each time the temperature changes by 0.5 ° C., and the relationship between the temperature of the hot water in the bath 28 and the combustion capacity is stored in a table format (or as a function) in the memory device of the controller. deep.

Then, when the operation for obtaining the residual water amount by calculating the amount of heat is started, the bath water temperature detection sensor 21 measures the bath temperature Ta in the bath 28, and the value Wa of the combustion capacity corresponding to the bath temperature is calculated. read. Also, when the operation of calorific value calculation is ended, the bath temperature Tb in the bath temperature 28 is measured by the bath temperature sensor 21, and the value Wb of the combustion capacity corresponding to the bath temperature is read. Next, combustion capacity Wa [cal / min] at the start of operation and combustion capacity Wb [cal at the end of operation
/ Min] and the average value Wmean = (Wa + Wb) / 2 is used to calculate the residual water content by calorific value calculation. That is, if the burner combustion time for calorie calculation is S [min], the residual water amount K [cc] in the bath 28 can be calculated by the following equation. K = (Wmean * S) / (Tb-Ta) = {(Wb + Wa) * S} / 2 (Tb-Ta) ...

In FIG. 4, the bathtub 2 is calculated by calorific value calculation as described above.
8 is a flowchart specifically showing a procedure of calculating a residual water amount in 8 and then heating the hot water in the bathtub 28. FIG. According to this procedure, if you turn on the automatic switch on the kitchen remote controller or bathroom remote controller (S
1), a fixed quantity Q1 (for example, 10 liters) of hot water or water from the hot water supply path 11 to the hot water drop path 23 and the reheating circuit 1
It is dropped into the bathtub 28 through 9 (S2). Then,
The circulation pump 20 is operated, and the circulation determination is performed depending on whether the water flow switch 22 is turned on (S3). The circulation determination is OK when there is residual water above the bath adapter level in the bathtub 28 and the water flow switch 22 is turned on, and there is only residual water below the bath adapter level in the bathtub 28, and the water flow When the switch 22 is off, it is determined to be not OK (OUT).

If the circulation determination is not OK, there is only residual water below the level of the bath adapter, and there is no risk of hot water overflowing from the bath 28 even if a sufficient amount of water is dropped, so a set amount Q2 (for example, set water amount-10 liters). ) Hot water or water from the hot water supply path 11 into the hot water drop path 23 and the reheating circuit 1
It drops into the bathtub 28 through 9 (S4). Then,
A normal reheating operation is performed to heat the hot water in the bathtub 28 to a set temperature (S11), and, for example, a warming operation operation for 4 hours is started (S12).

On the other hand, when the circulation judgment is OK, there is residual water above the level of the bath adapter and it is desired to drop the hot water up to the set water level so that it will not overflow from the bathtub 28. Calculate the amount of water. When the calorific value calculation is started, the circulation pump 20 circulates the hot water in the bath 28 to the reheating circuit 19 , and the burner 3 heats the reheating heat exchanger 9 to heat the hot water passing through the reheating heat exchanger 9. Yes (S5). At the same time, when the calculation of the amount of heat is started, the bath water temperature detection sensor 21 detects the bath temperature Ta in the bath 28 and stores it in the storage device of the controller (S6). When the burner 3 stops burning after the reheating operation for a certain time S is finished (S7), the bathtub hot water temperature Tb at the end is detected by the bathtub hot water temperature detection sensor 21 and stored in the storage device of the controller (S8).

When the reheating operation for the constant time S for calorific value calculation is completed in this way, the hot water temperatures Ta and Tb at the start and end are read from the storage device, and the controller responds to the hot water temperature Ta at the start. The combustion capacity Wa and the combustion capacity Wb corresponding to the hot water temperature Tb at the end are read from the table, and the remaining water amount K is calculated by the above equation (S9).

When the residual water amount K is obtained, the controller determines whether or not pouring into the bathtub 28 is necessary (S10), and if it is necessary, the controller determines the residual water amount K from the set water amount (water amount up to the set water level). After dropping the drawn amount of hot water into the bathtub 28 (S11), and if it is determined that the residual water amount K is close to the set water amount and pouring is not necessary, the normal reheating operation is immediately performed to set the hot water in the bathtub 28. Boil to temperature (S11),
For example, the warming operation operation for 4 hours is started (S12).

In this embodiment, the hot water temperature is detected at the start and end of the additional heating for calculating the heat quantity, and the combustion capacity according to the hot water temperature is used, so that the residual water content can be accurately obtained. Further, since the average value of the combustion ability at the start of the additional heating and the combustion ability at the end of the additional heating is used, the calculation accuracy of the residual water amount can be further improved by a simple calculation.

In the above embodiment, the hot water temperature is detected only at the start and end. However, the hot water temperature in the bathtub is detected at regular time intervals, and the combustion capacity that changes at constant time intervals is obtained, and the value is calculated. May be integrated to obtain an average value. Alternatively, if the table has a combustion capacity value for each constant temperature (for example, 0.5 ° C.), the time interval for each constant temperature is measured, and the product of the time interval and the combustion capacity value at that time is measured. May be integrated to obtain the average value of the combustion ability.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a bath temperature of a two-can, two-fluid type bath combustor and a bath temperature and a burning capacity in a one-can, two-fluid type.

FIG. 2 is a diagram showing a configuration of a one-can-two-channel type bath water heater according to an embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between hot water temperature in a bathtub and combustion capacity.

FIG. 4 is a flow diagram showing a procedure for reheating the hot water in the bathtub in the bath water heater of FIG.

[Explanation of symbols]

2 cans 3 burners 8 Hot water heat exchanger 9 Heat exchanger for reheating 11 Hot water supply passage 19 Reheating circuit 21 Bathtub temperature sensor 28 bathtub

Claims (4)

(57) [Claims] 1. A structure for heating a heat exchanger for hot water supply and a heat exchanger for additional heating at the same time by one combustion device.
Together are made, comprising a temperature detecting means for detecting the water temperature in the bathtub, based on the hot water temperature in the bathtub that has been detected by said temperature detecting means, the combustion of the burner used for the residual water amount calculating by heat calculation method A bath hot water supply device whose capacity is determined, and the controller controls the relationship between the temperature of hot water in the bathtub and the combustion capacity.
It is stored in a storage device and used to calculate the remaining water amount from the hot water temperature in the bathtub using the above relationship.
A bath water heater characterized in that the burning capacity of the burner is determined . 2. Detected by the temperature detecting means,
From the hot water temperature in the bathtub before and after the start of operation for calculating the remaining water amount, the relationship stored in the storage device is used.
Then, the combustion capacity of the combustion instrument before and after the start of operation is obtained, and the storage is performed from the hot water temperature in the bathtub before and after the operation for the remaining water amount calculation detected by the temperature detection means.
Using the relationship stored in the device, the combustion capacity of the combustion equipment before and after the end of operation is calculated, the average combustion capacity is calculated from both combustion capacities, and the residual water content is calculated by the calorific value calculation method. The method according to claim 1, wherein
Bath water heater described in. 3. The hot water temperature in the bathtub is detected at regular intervals and
For each time of the burner used to calculate the remaining water amount from the detected hot water temperature
Characterized by seeking the burning ability in
The bath water heater according to claim 1. 4. Detected by the temperature detection means
Each time the temperature of the hot water in the bath changes by a certain temperature,
To obtain the combustion capacity of the combustion equipment used for residual water calculation
The bath water heater according to claim 1, characterized in that
Place