JPH06117686A - Setting method for thermal output of burner of two-boiler two-channel type bath boiler - Google Patents

Abstract

PURPOSE:To prevent a temperature of hot water from a shower at the time of completion of filling hot water in a bathtub is being carelessly exceeded when filling of the hot water in the bathtub and hot water from shower are simultaneously conducted. CONSTITUTION:A bath boiler 10 has a heat exchanger 11 commonly used for filling and supplying of hot water in bath and the other, a bath temperature keeping combustion heat exchanger 12, and common burners 13a, 13b. Thermal outputs of the burners 13a, 13b are decided based on calculation of heat quantity for setting a target temperature to a bath temperature keeping temperature irrespective of presence or absence of using hot water during bath temperature keeping operation, and even if a bath temperature keeping function is finished, the target temperature is not reset to hot water supply temperature unless stop of the hot water supply is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-can two-drain type bath kettle equipped with a common burner, in which hot water is extremely hot when hot water supply and hot water filling or reheating are concurrently performed. The present invention relates to a burner heat output setting method in a two-can two-fluid bath kettle that can effectively avoid a situation where the hot water supply temperature becomes insufficient.

[0002]

2. Description of the Related Art A two-can two-channel bath kettle BF having a common burner BN, a heat exchange passage F1 for hot water supply, and a heat exchange passage F2 for additional heating is known (FIG. 4).

Water supply from a water source W is performed by a heat exchange path F for hot water supply.
It is guided to the inlet side of 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 connecting to the hot water side of the mixed water tap MV, the water tap HV for filling water
After that, it is opened to the bath BT. Further, the heat exchange path F2 for additional heating is bidirectionally connected to the bath BT through the circulation pump P. However, heat exchange paths F1 and F
2 shall be thermally coupled to each other. Therefore, if the burner BN is operated by opening the mixed faucet MV, the heat exchange passage F1 can supply hot water of a predetermined temperature through the shower SH, while the faucet HV is opened to the bath BT. The hot water HW having another predetermined temperature can be filled. On the other hand, if the circulation pump P is operated and the burner BN is operated, the hot water HW in the bath BT can be heated by the heat exchange path F2 to reheat the bath BT.

Since the burner BN is commonly used for hot water supply, hot water filling, and reheating, the overall structure is simple and the heat exchange path F1,
Since F2 is independent in the circuit, there is an advantage that the water supply pipe can be directly connected as the water source W and the hot water supply pressure can be made high. The burner BN is set to a high heat output so as to generate a sufficiently high amount of heat when hot water is supplied, while the burner BN is filled with hot water H when hot water is filled.
Operate by setting to a low heat output so that the W temperature becomes appropriate. This is because the hot water from the shower SH can be mixed with the water supplied from the water source W by the mixing faucet MV to have an appropriate temperature. Further, the burner BN may be operated by setting an appropriate constant heat output at the time of reheating.

[0005]

According to the prior art, when a shower is used during filling, when the filling is completed, the burner is switched from the low heat output to the high heat output. If the operation of (1) is delayed, unexpectedly high temperature hot water is discharged from the shower, which may pose a danger to the user. Further, when the reheating and the hot water supply by the shower are performed simultaneously, there is a problem that the heat output of the burner becomes insufficient and the hot water supply temperature from the shower is significantly lowered.

Therefore, in view of the problems of the prior art, the object of the present invention is to appropriately switch the contents of the calorific value calculation for determining the heat output of the burner so that the hot water supply temperature from the shower can be satisfied even when the filling is completed. A method of setting the heat output of the burner in the two-can two-passage bath kettle is provided, in which the hot water supply temperature from the shower does not decrease too much even if the reheating and the hot water supply are performed in parallel. Especially.

[0007]

The structure of the first invention according to the present application for achieving the above object is to provide a heat exchange path for hot water supply, which is 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 the two-can two-fluid type bath kettle equipped with a common burner, the target temperature is set to the filling temperature regardless of whether hot water is used or not during filling. The condition is that the target temperature is set to the hot water supply temperature and the calorific value is calculated on condition that the use of the hot water supply is completed and stopped.

According to the second aspect of the present invention, the heat exchange path for hot water supply, which is used for both filling and hot water supply, and the heat exchange path for reheating, which is thermally coupled to the heat exchange path for hot water supply, are common. When setting the heat output of the burner of the two-can two-fluid bath kettle equipped with a burner, when hot water is used during heating, the target temperature is set to the hot water supply temperature, and the required amount of heat for hot water supply is calculated The gist is to add the amount of heat and calculate the amount of heat.

The heat quantity can be calculated by adding a correction to the required heat quantity for hot water supply by a distribution ratio determined from the bath return temperature, the water temperature and the water quantity.

[0010]

According to the structure of the first aspect of the invention, the calorific value calculation during the filling is performed by setting the target temperature to the filling temperature, and the filling temperature at this time is about 42 ° C., for example. It is also a suitable temperature for supplying hot water from the shower.
On the other hand, when the filling of the hot water 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 the optimum temperature by mixing with the water supply through the mixing tap. The temperature is high, for example, about 75 ° C. so that showers can be obtained. Here, the target temperature is the basis of the calorific value calculation for determining the heat output of the burner, but it does not change even if the filling of water is completed unless the hot water supply is temporarily stopped. Therefore, there is no danger that hot water will be accidentally discharged from the shower.

According to the configuration of the second invention, even if hot water is used during reheating, the calorific value is calculated by adding the reheating heat quantity to the required heat quantity for hot water supply, so the hot water supply temperature from the shower is not appropriate. It is possible to effectively eliminate the risk that the value will decrease.

In general, when the hot-water supply heat exchange path and the additional heating heat exchange path are thermally coupled, if hot water supply and additional heating are used together, both heat exchange paths are Also, heat transfer occurs. At this time, the required heat quantity in the former,
That is, the required heat quantity Qa for hot water supply can be calculated by Qa = (Ta-Tw) Wa. However, Ta is hot water supply temperature, Tw is water supply temperature, and Wa is water supply amount.

On the other hand, when the heating amount Qc for additional heating is used, the distribution ratio H = Qa / (Qc + Qa) between the two is such that the circulating water amount Wr during the additional heating, the bath return temperature Tf, and the feed water temperature Tw.
, Hot water supply temperature Ta, and water supply amount Wa. Here, since the circulating water amount Wr and the hot water supply temperature Ta may be regarded as constants in an actual operating state, after all, the distribution ratio H
Can be expressed as H = f (Tf, Tw, Wa). However, f is a function determined by the system configuration. Therefore, when the distribution ratio H is calculated 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 specification of the device.

[0014]

Embodiments Embodiments will be described below with reference to the drawings.

The method for setting the heat output of the burner in the two-can two-water-passage bath kettle is as follows: a bath kettle 10 provided with a heat exchange passage 11 for hot water supply, a heat exchange passage 12 for additional heating, and shared burners 13a, 13b. (Fig. 1).

The burners 13a and 13b are arranged in the upper part of the bath kettle 10, and the burners 13a and 13b are provided with a blower 14 for taking in combustion air. The burners 13a and 13b have, for example, different maximum heat outputs, and by continuously operating one and intermittently operating the other, it is possible to realize an arbitrary heat output as a whole. The high-temperature combustion gas from the burners 13a, 13b passes through the gap between the fins 11a, 11a, which are commonly attached to the heat exchange paths 11, 12, and is discharged to the outside via the flue 10a and the exhaust port 10b. can do.

The heat exchange paths 11 and 12 are attached to the lower portion of the bathtub 10. The heat exchange passages 11 and 12 are a pair of meandering tubes that are in close contact with each other through a large number of fins 11a, 11a ... (FIG. 2), and both are thermally integrated together. As long as the heat exchange paths 11 and 12 are filled with water, the burners 13a and 13b can be operated as long as water is supplied to at least one of the heat exchange paths 11 and 12.

The water supply from the water source W is introduced to the mixing faucet MV connected to the shower SH, and is also introduced into the casing 20 for accommodating the bath kettle 10 via the water faucet WV and the check valve WC. 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 passage 11 is connected to the hot water side of the mixed faucet MV via a mixer tank 22 and a flow rate control valve 23 having an operation motor M. A solenoid valve 24 for filling water is branched and connected to the outlet side of the flow rate 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. There is. Here, it is assumed that the branch valve 25 also operates as a vacuum breaker for the piping system by connecting the atmosphere opening pipe 25a to the other input port. The output port of the branch valve 25 is connected to the outlet side of the heat exchange passage 12 and also via a water filling pipe SP,
It is also branched and connected to the bath BT.

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

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

First, consider the case where hot water is supplied through the shower SH. Now, when the whole is in the operating state and the hot water side of the mixed faucet MV is opened, the water from the water source W is supplied by the water supply valve W.
It flows into the heat exchange path 11 for hot water supply via V, the check valve WC, and the flow rate sensor 21, and further reaches the hot water side of the mixed faucet MV via the mixer tank 22 and the flow rate control valve 23. Therefore, at this time, using the hot water supply temperature Ta manually set via the 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 ... (1) is used to calculate the required heat quantity for hot water supply Qa,
The burners 13a and 13b may be operated so that the heat output Q is Q = Qa.

Since the hot water supply temperature Ta is generally set to a high temperature of about 75 ° C., for example, the mixed tap MV is used.
Opens its water side and supplies water from the water source W and the heat exchange passage 1
Mix the hot water from 1 and let the appropriate temperature of shower water come out. In addition, the burners 13a and 13b have a water supply amount W.
Only when a is greater than or equal to the specified amount, the operation is performed, and when it is less than the specified amount, the operation is automatically stopped.

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

In the water filling mode, first, the water filling electromagnetic valve 24 is opened to fill the heat exchange passage 12 and the circulation pump 27 connected thereto with water via the branch valve 25. , The burners 13a and 13b are operated. However, the burners 13a and 13b at this time have the heat output Q
However, for example, it is assumed that the operation is performed so as to match the required heat quantity for hot-water filling Qb based on the heat quantity calculation of the following equation. That is, Qb = (Tb-Tw) Wa (2) where Tb is a bath boiling temperature which is manually set separately,
That is, it is the filling temperature.

At this time, the circulation pump 27 is stopped, and the opening / closing valve 26 on the water absorption side of the circulation pump 27 is closed when the heat exchange passage 12 and the circulation pump 27 are sufficiently filled with water. And then bath B
The filling of T with T can be performed in one direction via the solenoid valve 24, the branch valve 25, and the filling pipe SP.

The progress of filling can be checked by the water level sensor 29. That is, the water level sensor 29
Is a kind of pressure sensor and can detect the water level in the bath BT. Therefore, when the water level is insufficient, the solenoid valve 24 may be opened to continue filling the water, and when the water level reaches a predetermined value, the solenoid valve 24 may be closed to complete the water filling. Good.

When the water filling is completed, the on-off valve 2
6 is opened, the circulation pump 27 is operated, and the hot water HW in the bath BT is sucked by the return pipe RP, whereby the temperature sensor T
Sf can detect the bath return temperature Tf. Therefore, the bath return temperature Tf is Tf with respect to the filling temperature Tb.
When <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 circulation pump 27 and operating the burners 13a and 13b at an appropriate constant heat output to recover 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 by opening the electromagnetic valve 24.

By turning on a reheating switch (not shown) on the operation board, the entire system can be shifted to the manual reheating mode. At this time, the open / close valve 26 is opened, the circulation pump 27 is operated, and the burner 13 is operated.
a and 13b continue the operation with an appropriate constant heat output. However, the burners 13a and 13b can be continuously operated on condition that the flow switch 28 detects the circulating water amount Wr equal to or more than a predetermined amount, and the manual heating mode is automatically set by, for example, Tf ≥47 (° C). It shall be canceled.

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 the program of FIG. 3, for example.

In the program, first, after confirming that the whole is in an operating state (program step (1) in FIG. 3, hereinafter simply referred to as (1)), if the filling mode is (2). , And sets a flag to that effect (3).

After that, when the water supply amount Wa from the flow rate sensor 21 is equal to or more than the predetermined amount (4), the program switches the calorific value calculation formulas by the flag set in the program step (3) ((5), ( 6),
(7)). That is, if it is not the filling mode, the flag is not set, so the calorific value calculation based on the equation (1) is performed (7), and the hot water supply temperature Ta is adopted as the target temperature for calorific value calculation. When the flag is set, the calorific value is calculated based on the above equation (2) regardless of whether hot water supply is actually used or not (6), and the filling temperature Tb is set as the target temperature. adopt. However, here, Ta ≈ 75 (° C), Tb ≈ 42
Since it is usually set to (° C.), when using the hot water supply in the hot water filling mode, the mixing faucet MV causes only the hot water from the heat exchange passage 11 to come out and hardly mixes the water supply from the water source W. Will work.

After that, the program confirms that it is not in the reheating mode (8), and repeats the operation. During that time, the flag is reset when the whole operation is stopped ((1), (12)) Or, only when the water filling mode is released after the water filling is completed and the water supply amount Wa decreases below a predetermined amount and the water supply use is stopped ((2), (4)). , (13)). That is,
The program is based on the condition that the filling of water is completed, the use of hot water is temporarily stopped, and then the use of hot water is resumed.
Since the calorific value calculation based on the formula (2) is switched to the calorific value calculation based on the formula (1) ((4), (5), (7)), even if the filling of water is completed while the hot water is being used, the shower SH does not There is no danger of hot water coming out of the room.

Furthermore, the program switches the calorific value calculation ((10), (1) depending on the size of the water supply amount Wa (9) when it is put into the reheating mode (8).
1)). That is, when the water supply amount Wa is smaller than the predetermined amount (9), it is determined that the hot water supply is not used, and the heat amount Qc for additional heating is set to Qc = Qco (where Qco is an appropriate constant heat amount). However, when the water supply amount Wa is large (11) and it is determined that the hot water supply is being used (9), the total heat quantity Qac required for simultaneous heating and hot water supply is calculated by the following formula ( 10). That is, Qac = Qc + Qa = Qco + Qa (3) Therefore, the program at this time is that the target temperature is set to the hot water supply temperature Ta when hot water is used during reheating.
It is possible to calculate the calorific value by adding the calorific value Qc = Qco for reheating to the required calorific value Qa for hot water supply which is set to and calculated, and the burners 13a and 13b are operated with the heat output Q = Qac. Therefore, there is no possibility that the temperature of the hot water discharged from the shower SH will drop excessively.

[0034]

Other Embodiments In the program step (10) of FIG. 3, the calorific value may be calculated by Qac = Qa / H (4). Where the distribution ratio H
= Qa / (Qc + Qa) depends on the specifications of the bath kettle 10.
Function f of bath return temperature Tf, water supply temperature Tw, water supply amount Wa
Can be obtained by calculation. That is, H = f (Tf, Tw, Wa) (5) The required total heat quantity Qac at this time reflects the hot water supply temperature Ta, the water supply temperature Tw, the water supply quantity Wa, and the bath return temperature Tf which vary depending on the operating conditions. Therefore, a 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) in FIG. 3 can be adopted independently of each other. That is, the programs can be adopted simultaneously as a series of programs as shown in FIG. 3, but may be configured to adopt only the former or only the latter. Also, the above equation (4),
The calorific value calculation based on the equation (5) is based on the premise that the heat exchange paths 11 and 12 are thermally coupled to each other. Therefore, although the equations (4) and (5) can be applied only to the bathtub 10 having such a configuration, the other heat quantity calculation methods are such that the heat exchange paths 11 and 12 are thermally It can be applied even in the case of independence.

[0036]

As described above, according to the first invention of this application, the target temperature for calorific value calculation is
When the shower is used during filling, the temperature is set to the filling temperature regardless of whether hot water is used or not, and even if the filling is completed, the setting will not be changed to the hot water temperature unless the use of hot water is stopped. However, there is an excellent effect that it is possible to effectively eliminate the risk that the hot water will come out of the shower carelessly and pose a danger to the user.

According to the second aspect of the present invention, when hot water is used during heating, the heat output of the burner is appropriately calculated by adding the heat amount for heating to the required heat amount for hot water supply and calculating the heat amount. Therefore, there is an effect that the hot water supply temperature from the shower is not unduly lowered.

[Brief description of drawings]

[Figure 1] Overall equipment configuration diagram

[Fig. 2] Main part configuration diagram

[Figure 3] Program flow chart

[Figure 4] Conceptual diagram of the overall configuration

[Explanation of symbols]

 Tb ... Boiling temperature Ta ... Hot water supply temperature Tw ... Water supply temperature Tf ... Bath return temperature Wa ... Water supply amount Qa ... Hot water supply required heat quantity Qc ... Additional heat quantity H ... Distribution ratio 11, 12 ... Heat exchange paths 13a, 13b ... Burner

Claims (3)

[Claims] 1. A heat output of a burner of a two-can two-way bath kettle having a heat exchange path for hot water supply, which is shared between hot water supply and hot water supply, a heat exchange path for reheating, and a common burner. During hot water filling, set the target temperature to the hot water temperature regardless of whether hot water is used or not, and set the target temperature to the hot water temperature if hot water filling is completed and hot water supply is stopped. A method for setting the heat output of a burner in a two-can, two-fluid bath kettle, which is characterized by calculating the amount of heat. 2. A heat exchange path for hot water supply, which is shared between hot water supply and hot water supply, a heat exchange path for reheating which is thermally coupled to the heat exchange path for hot water supply, and a common burner. When setting the heat output of the burner of the two-canned bath kettle, when using hot water during reheating, add the heating amount for heating to the required heat amount for hot water calculated by setting the target temperature to the hot water temperature. A method for setting the heat output of a burner in a two-can, two-fluid bath kettle, which is characterized by calculating the amount of heat. 3. The two-can two-water canal according to claim 2, wherein the required heat quantity for hot water supply is calculated by adding a correction based on a distribution ratio determined from the bath return temperature, the water supply temperature, and the water supply quantity. Method for setting the heat output of the burner in the bath tub.