JP3188987B2 - Setting method of heat output of burner in two-can two-channel bath kettle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a two-can, two-channel bath with a common burner, in which extremely high-temperature hot water is supplied at the same time when hot water supply and hot water filling or reheating are performed simultaneously. In addition, the present invention relates to a method for setting the heat output of a burner in a two-can, two-channel bath kettle that can effectively avoid a situation where the hot water supply temperature is insufficient.

[0002]

2. Description of the Related Art There is known a two-tank two-channel type bathtub BF having a common burner BN, a heat exchange path F1 for hot water supply, and a heat exchange path F2 for additional heating (FIG. 4).

Water supplied from a water source W is supplied to a heat exchange path F for hot water supply.
1 and the water side of the mixing faucet MV connected to the shower SH, and the outlet side of the heat exchange path F1 is
In addition to being connected to the hot water side of the mixing faucet MV, a faucet H for hot water filling
It is opened to the bath BT via V. The additional heat exchange path F2 is bidirectionally connected to the bath BT via the circulation pump P. However, heat exchange paths F1, F
2 are thermally connected to each other. Therefore, when the mixing faucet MV is opened and the burner BN is operated, the heat exchange path F1 can supply hot water at a predetermined temperature via the shower SH. The hot water HW at another predetermined temperature can be filled with water. On the other hand, if the burner BN is operated by operating the circulation pump P, the hot water HW in the bath BT can be heated by the heat exchange path F2, and the bath BT can be additionally heated.

[0004] Since the burner BN is used commonly for hot water supply, hot water filling, and additional heating, the overall structure is simplified and the heat exchange path F 1,
Since F2 is independent in terms of circuit, there is an advantage that the water supply pipe can be directly connected as the water source W, and the hot water supply water pressure can be increased. The burner BN is operated at a high heat output so as to generate a sufficiently high amount of heat at the time of hot water supply.
The operation is performed with the low heat output set so that the temperature becomes appropriate. This is because the hot water from the shower SH can be mixed with the water supply from the water source W to have an appropriate temperature by the mixing faucet MV. Further, the burner BN may be operated with an appropriate constant heat output set during additional heating.

[0005]

In the prior art, when the shower is used during filling and when filling is completed, the burner is switched from low heat output to high heat output, so that the operation of the mixing faucet is stopped. If it is late, there is a problem that hot water is unexpectedly discharged from the shower, which may endanger the user. Further, when the additional heating and the hot water supply by shower are used together, there is a problem that the heat output of the burner becomes insufficient, and the temperature of hot water supplied from the shower drops remarkably.

Accordingly, an object of the present invention is to solve the problem of the prior art by appropriately switching the content of the calorific value calculation for determining the heat output of the burner, so that the hot water supply temperature from the shower when the filling is completed is excessive. To provide a method for setting the heat output of a burner in a two-can, two-channel bath that does not cause the temperature of hot water from the shower to drop too much, even if additional heating and hot water are used in combination. is there.

[0007]

Means for Solving the Problems In order to achieve the above object, a first invention according to the present application comprises a heat exchange path for hot water supply commonly used for filling and hot water supply, and a heat exchange path for additional heating. When setting the heat output of the burner of a two-can two-channel bath kettle equipped with a common burner, the target temperature is set to the hot water temperature, regardless of whether or not hot water is used, while the hot water is being used. The gist is that the target temperature is set to the hot water supply temperature and the calorific value is calculated on the condition that the hot water supply has been completed and the hot water supply has been stopped.

A second aspect of the present invention provides a heat exchange path for hot water supply commonly used for filling and hot water supply, and a heat exchange path for additional heating which is thermally coupled to the heat exchange path for hot water supply. When setting the heat output of the burner of a two-can, two-channel bath kettle equipped with a burner, when using hot water during additional heating, a target calorie is calculated by setting the target temperature to the hot water temperature, and a constant calorific value. The gist is to calculate the calorific value by adding the calorific value for additional firing.

A third aspect of the present invention provides a hot water supply heat exchange path commonly used for hot water filling and hot water supply, and an additional heating heat exchange path thermally coupled to the hot water supply heat exchange path. When setting the heat output of the burner of a two-can, two-channel bath kettle equipped with a burner, when using hot water during additional heating, set the target temperature to the hot water temperature and calculate the required amount of hot water for the hot water supply. The calorific value calculation is performed by adding a correction based on the distribution ratio determined from the water supply temperature and the water supply amount.

[0010]

According to the structure of the first aspect of the invention, the calorie calculation during filling is performed by setting the target temperature to the filling temperature, and the filling temperature at this time is, for example, about 42 ° C. Therefore, the temperature of hot water from the shower is also appropriate.
On the other hand, when the hot water filling is completed, the target temperature is changed to the hot water supply temperature on condition that the hot water supply is stopped, and the hot water supply temperature at this time is mixed with the water supply through the mixing faucet and the appropriate temperature shower water is supplied. Is obtained, for example, at a high temperature of about 75 ° C. Here, the target temperature is the basis of the calorific value calculation for determining the heat output of the burner. However, even if the filling is completed, it is not changed unless the hot water supply is temporarily stopped, so careless preparation from the shower is required. There is no danger that hot water will be dispensed.

According to the configuration of the second aspect of the invention, even if hot water is used during additional heating, the calorific value is calculated by adding a fixed amount of additional heating heat to the required amount of hot water. There is no possibility that the temperature will be unduly lowered. Here, the constant heat amount means a constant heat amount that does not depend on the bath return temperature or hot water supply temperature.

According to the configuration of the third aspect, the following operation is obtained. That is, in general, when the heat exchange path for hot water supply and the heat exchange path for additional heating are thermally coupled,
When both hot water supply and additional heating are used, heat transfer occurs between both heat exchange paths. At this time, the required amount of heat in the former,
That is, the required amount of heat Qa for hot water supply can be calculated by Qa = (Ta−Tw) Wa. Here, Ta is a hot water supply temperature, Tw is a water supply temperature, and Wa is a water supply amount.

On the other hand, assuming that the amount of heat for reheating is Qc, the distribution ratio H = Qa / (Qc + Qa) of the amounts of heat for both is determined by the amount of circulating water Wr during reheating, the bath return temperature Tf, and the supply water temperature Tw.
, Hot water supply temperature Ta, and water supply amount Wa. Here, the circulating water amount Wr and the hot water supply temperature Ta may be regarded as constants in an actual operation state.
= F (Tf, Tw, Wa). Here, f is a function determined by the configuration of the system. Therefore, when the distribution ratio H is obtained by calculation from the bath return temperature Tf, the water supply temperature Tw, and the water supply amount Wa, the required total heat amount Qac can be calculated as Qac = Qa / H. The distribution ratio H
= F (Tf, Tw, Wa) may be determined in advance by an empirical formula or the like for each device specification.

[0014]

Embodiments will be described below with reference to the drawings.

The method of setting the heat output of the burner in the two-can two-channel bath kettle comprises a bath kettle 10 provided with a heat exchange path 11 for hot water supply, a heat exchange path 12 for additional heating, and shared burners 13a and 13b. (FIG. 1).

The burners 13a and 13b are arranged above the bath kettle 10, and the burners 13a and 13b are provided with a blower 14 for taking in combustion air. For example, the burners 13a and 13b have different maximum heat outputs, and one of them can be continuously operated and the other can be intermittently operated, so that an arbitrary heat output can be realized as a whole. The high-temperature combustion gas from the burners 13a, 13b passes through the gaps between the fins 11a, 11a.
It is discharged to the outside through the flue 10a and the exhaust port 10b.

The heat exchange paths 11 and 12 are mounted at the lower part of the bath 10. The heat exchange passages 11 and 12 are a pair of meandering tubes closely contacted via a number of fins 11a (FIG. 2) and are thermally integrated. In addition,
As long as the heat exchange paths 11 and 12 are filled with water,
If water is sent to at least one, the burners 13a, 1
It is possible to drive 3b.

The water supply from the water source W is guided to the mixing faucet MV connected to the shower SH (FIG. 1), and is introduced into the housing 20 containing the bath kettle 10 via the water supply valve WV and the check valve WC. Then, it is guided to the inlet side of the heat exchange path 11 via the flow rate sensor 21. Further, the outlet side of the heat exchange path 11 is connected to the hot water side of the mixing faucet MV via a mixer tank 22 and a flow control valve 23 having an operation motor M. A solenoid valve 24 for filling is branched and connected to the outlet side of the flow control valve 23, and a branch valve 25 composed of a set of three check valves is connected to the outlet side of the solenoid valve 24. I have. Here, the branch valve 25 also operates as a vacuum breaker of the piping system by connecting the atmosphere open pipe 25a to the other input port. The output port of the branch valve 25 is connected not only to the outlet side of the heat exchange path 12 but also to the bath BT via the hot water pipe SP.

A return pipe RP having a filter RP1 is connected to the bath BT. The return pipe RP is connected to a suction side of a circulation pump 27 via an electric open / close valve 26. The discharge side of the circulation pump 27 is connected to the inlet side of the heat exchange path 12 via a flow switch 28. In addition,
A water level sensor 29 and a temperature sensor TSf are provided on the inlet side of the on-off valve 26. Further, a temperature sensor Tsw is provided between the check valve WC and the flow rate sensor 21, and another temperature sensor TSa is mounted on the heat exchange path 11.

The outline of the operation of the bath kettle 10 is as follows.

First, consider the case where hot water is supplied via the shower SH. While the whole is in operation, the mixing faucet MV
When the hot water side is opened, the water supply from the water source W is supplied via the water supply valve WV, the check valve WC, and the flow rate sensor 21 to the heat exchange path 1 for hot water supply.
1 and further into a mixer tank 22, a flow control valve 2
3 to the hot water side of the mixing faucet MV. Therefore, at this time, using the hot water supply temperature Ta manually set via an operation board (not shown), the water supply temperature Tw detected by the temperature sensor TSw, and the water supply amount Wa detected by the flow rate sensor 21, Qa = (Ta− Tw) Wa... The required heat quantity Qa for hot water supply is obtained based on the heat quantity calculation by (1),
The burners 13a and 13b may be operated so that the heat output Q = Qa.

Since the hot water supply temperature Ta is generally set to a high temperature of, for example, about 75 ° C., the mixed faucet MV
Opens the water side and supplies water from water source W and heat exchange path 1
Mix with hot water from 1 to make hot water of appropriate temperature. The burners 13a and 13b are operated only when the water supply amount Wa is equal to or more than a predetermined amount.
The operation shall be automatically stopped.

When an automatic operation switch is turned on on an operation board (not shown), the whole operation shifts to a hot water filling mode.

In the hot water filling mode, first, the hot water filling electromagnetic valve 24 is opened, and the heat exchange path 12 and the circulation pump 27 connected thereto are filled with water through the branch valve 25. The burners 13a and 13b are operated. However,
At this time, the burners 13a and 13b are operated with a heat output Q that matches the required heat quantity Qb for filling, for example, based on the heat quantity calculation of the following equation. That is, Qb = (Tb−Tw) Wa (2) where Tb is a bath boiling temperature that is manually set separately,
That is, the filling temperature.

At this time, the circulation pump 27 is stopped, and the on-off valve 26 on the water suction side of the circulation pump 27 is closed when the heat exchange path 12 and the circulation pump 27 are sufficiently filled with water. do it. Therefore, the filling of the bath BT can be performed in one direction thereafter through the solenoid valve 24, the branch valve 25, and the filling pipe SP.

The progress of the filling is checked by a water level sensor 29. That is, water level sensor 29 is a kind of pressure sensor, and can detect the water level in bath BT. Therefore, when the water level is insufficient, the solenoid valve 24
Is opened and the filling is continued. When the water level reaches a predetermined value, the filling is completed by closing the solenoid valve 24.

When the filling is completed, the on-off valve 2
6, the circulation pump 27 is operated, and the return pipe RP sucks the hot water HW in the bath BT, so that the temperature sensor T
The bath return temperature Tf can be detected via Sf. Therefore, when the bath return temperature Tf is Tf <Tb with respect to the hot water temperature Tb, the burners 13a and 13b can appropriately repeat the automatic reheating operation. However,
The automatic reheating operation at this time refers to an operation of operating the circulating pump 27 and operating the burners 13a and 13b with an appropriate constant heat output to restore the bath return temperature Tf to Tf ≧ Tb. Further, when a decrease in the water level of the bath BT is detected, the filling operation may be repeated as appropriate by opening the solenoid valve 24.

By turning on a reheating switch on an operation board (not shown), the entire apparatus can be shifted to a manual reheating mode. At this time, the on-off valve 26 opens,
When the circulation pump 27 is operated, the burners 13a,
13b continues operation at an appropriate constant heat output. However, the burners 13a and 13b can continue the operation on condition that the flow switch 28 detects a circulating water amount Wr equal to or more than a predetermined amount.
It is assumed that the automatic release is performed when Tf ≧ 47 (° C.).

In the above series of operations, the burner 13
The calorific value calculation for setting the heat output Q of a and 13b can be switched according to, for example, the program of FIG.

The program first confirms that the entire system is in operation (program step (1) in FIG. 3, hereinafter simply referred to as (1)), and if the program is in the filling mode (2) , A flag indicating that fact is set (3).

Thereafter, when the water supply amount Wa from the flow rate sensor 21 is equal to or more than a predetermined amount (4), the program switches the calorific value calculation formula by the flag set in the program step (3) ((5), (6) ), (7)).
That is, if the mode is not the hot water mode, since the flag is not set, the calorie calculation based on the above-mentioned equation (1) is performed (7), and the hot water supply temperature Ta is adopted as the target temperature for the calorie calculation. When the flag is set, the calorific value is calculated based on the above equation (2) regardless of whether or not hot water is actually used (6), and the filling temperature Tb is adopted as the target temperature. I do. However, here, it is common to set Ta ≒ 75 (° C.) and Tb ≒ 42 (° C.). Therefore, when hot water is used in the hot water filling mode, the mixing faucet MV only uses hot water from the heat exchange path 11. Is operated so that the water supplied from the water source W is hardly mixed.

Thereafter, the program confirms that the mode is not the reheating mode (8), and repeats the operation. During this time, the flag is reset only when the whole is out of the operation state ((1), (2)). 12)) or only when the filling is completed and the filling mode is released, and when the water supply amount Wa is reduced to a predetermined amount or less and the hot water supply is stopped ((2), (4), (13)). That is, the program completes the filling, stops using hot water,
Thereafter, on condition that the use of hot water is resumed, the calorie calculation based on equation (2) is switched to calorie calculation based on equation (1) ((4), (5), (7)). Even if hot water is completely filled, there is no danger that hot water will be inadvertently discharged from shower SH.

Further, when the program is put into the reheating mode (8), the program switches the calorific value calculation according to the magnitude of the water supply amount Wa (9) (10), (1)
1)). That is, when the water supply amount Wa is smaller than the predetermined amount (9), it is determined that hot water is not used, and the additional heating heat amount Qc is set to Qc = Qco (where Qco is an appropriate constant heat amount). 11) When it is determined that the water supply amount Wa is large and hot water supply is being used (9), the necessary total heat amount Qac for causing the additional heating and the hot water supply to be performed in parallel is calculated by the following equation (10). That is, Qac = Qc + Qa = Qco + Qa (3)

Therefore, the program at this time is such that when the hot water supply is being used during the additional heating, the required additional heating heat quantity Qa calculated by setting the target temperature to the hot water supply temperature Ta is a fixed quantity of additional heating heat quantity. The calorific value can be calculated by adding Qc = Qco, and the burners 13a and 13b are operated with the heat output Q = Qac. Therefore, shower SH
There is no danger that the temperature of the hot water discharged from the furnace will be too low.

[0035]

Other Embodiments In the program step (10) in FIG. 3, the calorific value may be calculated by Qac = Qa / H (4). Here, the distribution ratio H = Q
a / (Qc + Qa) can be obtained by calculation as a function f of the bath return temperature Tf, the water supply temperature Tw, and the water supply amount Wa according to the specifications of the bath kettle 10. That is, H = f (Tf, Tw, Wa) (5)

The required total heat quantity Qac at this time is determined by the hot water supply temperature Ta, the water supply temperature Tw, and the water supply amount W, which fluctuate depending on the operating conditions.
a, the bath return temperature Tf is reflected, and more accurate calorific value calculation can be performed.

In the above description, the program steps (1) to (7) and the program steps (8) to
(10) can be adopted independently of each other. That is, both programs can be employed simultaneously as a series of programs as shown in FIG. 3, but the program may be configured to employ only the former or only the latter.
Further, the calorific value calculation based on the above formulas (4) and (5) is
It is assumed that the heat exchange paths 11, 12 are thermally connected to each other. Therefore, equations (4) and (5) are
Although it can be applied only to the bath kettle 10 of such a form, the other calorific value calculation method is as follows.
The present invention is applicable even when 1, 12 are thermally independent.

[0038]

As described above, according to the first aspect of the present invention, the target temperature for calorific value calculation is set to the filling temperature during filling, regardless of whether hot water is used or not. Even if it is completed, the setting will not be changed to the hot water supply temperature unless the hot water supply is stopped, so even if the shower is used during filling, hot water may be inadvertently discharged from the shower. Thus, there is an excellent effect that a danger to the user can be effectively eliminated.

According to the second aspect of the invention, when the hot water supply is used during the additional heating, the calorific value is calculated by adding the fixed additional calorific value to the required amount of the hot water. Thus, the heat output of the burner can be appropriately maintained, and the temperature of hot water supplied from the shower does not unduly decrease.

According to the third aspect, when hot water is used during additional heating, more accurate calorific value calculation can be performed by reflecting operating conditions.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the overall equipment configuration.

FIG. 2 is a configuration diagram of a main part.

FIG. 3 is a program flowchart.

FIG. 4 is a conceptual diagram of the entire configuration showing a conventional technique.

[Explanation of symbols]

 Tb: Hot water filling temperature Ta: Hot water supply temperature Tw: Water supply temperature Tf: Bath return temperature Wa: Water supply amount Qa: Required heat amount for hot water supply Qc: Heating amount for reheating H: Distribution ratio 11, 12, Heat exchange paths 13a, 13b: Burners

(56) References JP-A-5-99500 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/00 602 F24H 1/10 302

Claims (3)

(57) [Claims] 1. The heat output of a burner of a two-tank two-channel bath kettle having a heat exchange path for hot water supply, a heat exchange path for additional heating, and a common burner, which is shared by hot water filling and hot water supply. During the filling, the target temperature is set to the filling temperature regardless of the use of hot water, and the target temperature is set to the filling temperature, on condition that the filling is completed and the use of hot water is stopped. A heat output setting method for a burner in a two-can, two-channel bath kettle, comprising calorie calculation. 2. A hot water supply heat exchange path shared by hot water filling and hot water supply, a supplementary heat exchange path thermally coupled to the hot water supply heat exchange path, and a common burner. When setting the heat output of the burner of a can-two-channel type bath kettle, when using hot water during additional heating, set the target temperature to the hot water supply temperature and calculate the required amount of heat for hot water supply. A heat output setting method for a burner in a two-can, two-channel bath kettle, wherein the calorific value is calculated by adding. 3. A hot water supply heat exchange path shared by hot water filling and hot water supply, a supplementary heat exchange path thermally coupled to the hot water supply heat exchange path, and a common burner. When setting the heat output of the burner of a can two-channel bath kettle, when using hot water during additional heating, the target temperature is set to the hot water temperature and the required amount of hot water for hot water supply is calculated. A method for setting the heat output of a burner in a two-can, two-channel bath kettle, wherein a calorific value is calculated by adding a correction based on a distribution ratio determined from the amount.