JP3584572B2 - Bath kettle device with hot water supply function - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bath kettle device with a hot water supply function.
[0002]
[Prior art]
In a bath apparatus with a hot water supply function equipped with one burner that performs heat exchange heating for bath reheating and heat exchange heating for hot water supply, if the reheating operation and the hot water supply operation are performed simultaneously, the reheating side No sensor for calculating the number of hot water is available in this circuit, so the feedforward number is the same as the required number of hot water for hot water supply and the number of temporary reheating for reheating. In addition, the start number at the time of simultaneous operation is added, and the feed start control is performed with the start number at the time of the simultaneous operation so that the burner always starts the operation by performing the continuous combustion by the proportional control. Thus, feedback control is performed so that the hot water supply temperature is detected and the hot water supply side is set to the set hot water temperature.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, a simultaneous operation switching reference for switching between continuous combustion by proportional control and on-off combustion control during simultaneous operation is performed depending on the type of exhaust mechanism of the apparatus and the exhaust resistance condition based on whether the wind pressure switch is on or off. Since the number was changed, when the operation was started with the simultaneous operation start number that added the uniform temporary chase-heating number regardless of the change in the exhaust resistance condition, depending on the number of required hot water numbers, In the feedback control, the difference between the number of simultaneous operation start and the number actually required is too large, and the difference between the number of simultaneous operation start and the reference number of simultaneous operation switching is too large. , It takes time to actually reach the required number or it takes time to switch the operation from continuous combustion by proportional control to on-off combustion control There was. In addition, there was a problem that the hot water supply overshot.
[0004]
Thus, the present invention solves the above-described problems in the conventional bath heater device with a hot water supply function, and in the case of simultaneously operating the hot water supply operation and the bath reheating operation, can perform good combustion with respect to the change in the exhaust resistance condition. It is another object of the present invention to provide a bath kettle device with a hot water supply function that can smoothly shift to a required number or combustion state from the start of operation and does not generate a large overshoot.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a bath kettle device with a hot water supply function of the present invention includes one burner that performs heat exchange heating for bath reheating and heat exchange heating for hot water supply, and includes a single reheating unit as a controller. When operation is performed, continuous combustion is performed with a fixed number of reheating units by feedforward control, and when hot water supply alone operation is performed, the required number of hot water units is switched by a combination of feedforward control and feedback control. In the case of more than the number, continuous combustion by proportional control is performed, and in the case of less than one, on-off combustion control is performed, and in the case of the single hot water supply operation, the type of the exhaust mechanism of the combustion can body and the on / off of the wind pressure switch. Depending on the exhaust resistance condition, the larger the exhaust resistance is, the larger the value is. A bath kettle device with a hot water supply function that selectively sets a reference number of hot water, and as a configuration of the controller, in a case of simultaneous operation of additional heating operation and hot water supply operation, the required number of hot water supply for hot water supply. Continuous combustion by feedforward control is started with the simultaneous operation start number obtained by adding the number of provisional reheating for provision of bath reheating, and the provisional reheating number is determined by exhausting the combustion can body. A larger value is obtained in advance as the exhaust resistance increases in accordance with the exhaust resistance condition depending on the type of mechanism and whether the wind pressure switch is on or off, and this value is stored and stored, and the corresponding provisional refueling signal corresponding to the exhaust resistance condition is stored. After simultaneous operation starts, feedback control is combined, and the total required number calculated is reduced to the given number of tentative chase-fired number, the lowest cutoff in hot water supply alone operation. Performs continuous combustion by the proportional control in the case where the switching reference scale number or time of simultaneous operation comprising adding recombinant reference scale number, if less than is characterized in that it has a configuration in which the on-off combustion control.
[0006]
In the features of the present invention, the number is a unit of calorific value, and 1 is a calorific value for raising 1 liter of water by 25 ° C. per minute.
The switching reference number is a combustion operation in which continuous combustion by proportional control is performed when operation is performed with more numbers, and on-off control combustion is performed when operation is performed with a number smaller than that. The number of switching numbers.
The combustion can body burns the burner inside, and when passing through the heat exchange section by the generated combustion gas, it performs heat exchange heating for bath reheating and heat exchange heating for hot water supply, and further heat exchange The can body is configured to exhaust used combustion gas as exhaust gas from an exhaust unit to the outside.
The type of the exhaust mechanism of the combustion can body is, for example, a so-called indoor installation outdoor natural exhaust type in which the combustion can body is arranged indoors and the exhaust pipe is arranged from indoor to outdoor, and the combustion can body is arranged indoors. In addition, a forced intake / exhaust type in which the intake / exhaust tube is arranged from indoor to outdoor to perform forced intake / exhaust, and a so-called outdoor natural exhaust type in which a combustion can body is arranged outdoors and exhaust is performed without providing an exhaust tube. Can be. In this case, the exhaust resistance of the indoor outdoor natural exhaust type is higher than that of the forced intake / exhaust type and the outdoor natural exhaust type.
A wind pressure switch is a switch that is normally turned on and off depending on the presence or absence of a back wind blown into the combustion can from the outside. If there is a back wind, the exhaust resistance increases and the wind pressure switch is turned on.
The number of tentative reheating is the number tentatively given as the number of hot water supply heating and reheating heating that will be used for reheating when starting the operation when the reheating operation and the hot water supply operation are performed simultaneously. By adding this number to the required number of hot water for hot water supply, the number of tentative firings is used as the number to start at the time of simultaneous operation. It is to be.
According to the type of exhaust mechanism and the exhaust resistance condition that changes depending on whether the wind pressure switch is turned on or off, the number of the temporary additional firing number is appropriately determined by an experiment in advance so that the larger the exhaust resistance becomes, the larger the temporary additional firing number becomes. The number for obtaining the combustion state is determined and stored in the controller. Thus, in the simultaneous operation, when the type of the exhaust resistance and the on / off state of the wind pressure switch are determined, the number of provisional chase-fire numbers corresponding to that is selected from the memory and set.
The total required number is the number obtained by adding the feedback control number to the feedforward control number (simultaneous operation start number) during the simultaneous operation of the reheating operation and the hot water supply operation.
The reference number for simultaneous operation switching is when the reheating operation and the hot water supply operation are simultaneously performed, and when the operation is performed with a larger number, continuous combustion by proportional control is performed. In the case where the operation is performed in the above-mentioned manner, the number of switching is a reference value for performing the on / off control combustion.
The minimum switching reference number in the hot-water supply alone operation means that, when the hot-water supply alone operation is performed, the exhaust resistance condition is the best, that is, for example, in the above case, the exhaust mechanism of the combustion can body is indoor-installed forced intake and exhaust type or outdoor installation In the case of the exhaust type and when the exhaust resistance is in the minimum condition, such as when the wind pressure switch is in the off state, if the number is larger, the tap water temperature for hot water supply is set by the proportional control by continuous combustion. It can be adjusted, but if the number is smaller than the specified number, it is considered that it is difficult to adjust the set tapping temperature unless on-off combustion control is performed.
According to the feature of the present invention, when the simultaneous operation is instructed, the controller calculates the required number of hot water outlets on the hot water supply side from the hot water supply set temperature, and depending on the type of exhaust mechanism and whether the wind pressure switch is on or off, From the number of pre-fired firing numbers stored in advance, select the corresponding number of pre-fired firing numbers, and add these two numbers to make the number of start times at the time of simultaneous operation, and start operation by continuous combustion by feedforward control I do. On the other hand, the reference number for simultaneous operation switching during operation is the number obtained by adding the selected number of provisional reheating units to the minimum reference number for switching during hot water supply alone operation, thereby achieving continuous combustion by proportional control. Switching between on / off control combustion. By doing so, at the time of starting the simultaneous operation, the operation can be started with an appropriate number of simultaneous operation start numbers corresponding to the exhaust resistance conditions, and good combustion can be ensured. In addition, since the number of tentatively-fired fires is selected and set according to the exhaust resistance for the actually required number, the difference between the number of simultaneous start operations and the actually required number can be reduced. In addition, immediately after the start of the operation, the adjustment up to the actually required number by the feedback control can be performed. Therefore, the time during which the hot water supply overshoots or undershoots can be shortened.
In addition, since the same reference number of simultaneous firing switching is set using the same number of temporary firing as used in the calculation of the number of simultaneous firing start numbers, the number of simultaneous start switching and the simultaneous operation The time switch reference number can be set without the difference becoming too large, and after starting the operation, the combustion operation can be quickly switched to the on / off control combustion as needed, and the overshoot of hot water supply can be reduced. It can be resolved promptly.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is an overall schematic configuration diagram of a bath kettle device having a hot water supply function according to an embodiment of the present invention, and FIG. 2 is a flowchart illustrating a control configuration of a controller.
[0008]
In FIG. 1, reference numeral 10 denotes a combustion can body, in which a heat exchange coil 23 of a reheating circuit 20 for reheating a bath and a heat exchange coil 33 of a hot water supply circuit 30 for hot water pass through the upper space. The bath reheating circuit 20 includes a bath return pipe 21 from the bathtub to the combustion can 10 and a bath outflow pipe 22 from the combustion can 10 to the bathtub. The bath return pipe 21 is provided with a circulation pump 40, a bath water level sensor 41, a bath water flow switch 42, a bath temperature sensor 43, and the like.
The hot water supply circuit 30 includes a water inlet pipe 31 and a water outlet pipe 32. The water inlet pipe 31 is provided with an incoming water flow sensor 44 and an incoming water temperature sensor 45, and the outlet pipe 32 is provided with a hot water outlet temperature sensor 46. An overflow prevention device 47 and a hot water supply temperature sensor 48 are provided downstream of the connection point of the bypass 34 of the hot water supply pipe 32, and further branched downstream from the hot water supply pipe 35 into a general hot water supply pipe 35 and an automatic bath water supply pipe 36. The bath automatic hot water supply pipe 36 is connected to the bath return pipe 21 via a drop valve mechanism 49 so that automatic hot water supply to the bathtub can be performed.
[0009]
A burner 50 is attached to a lower portion of the combustion can body 10, and a fuel spray nozzle 51 faces the inside of the combustion can body 10 to spray fuel into the combustion can body 10. It is blown into the body 10. The fuel is petroleum fuel. The fuel is supplied to the fuel spray nozzle 51 side by two pumps 54 and 55 through a petroleum supply pipe 53, and the supply flow rate is controlled by a flow rate control valve 56. The fuel spray nozzle 51 may be a return type nozzle having a return path 57.
An exhaust gas collecting chamber 11 is provided at the uppermost portion in the combustion can body 10, and the exhaust gas that has entered the exhaust gas collecting chamber 11 is discharged to the outside through an exhaust mechanism 12 therefrom. The example shown in the figure shows a natural exhaust type installed outdoors, and the exhaust gas is exhausted from an exhaust gas collecting chamber 11 to the outside via a short cylinder as an exhaust mechanism 12. A wind pressure switch 13 is provided in the short cylinder. In the present embodiment, the exhaust mechanism 12 is an outdoor-installed natural exhaust type, but a so-called forced intake / exhaust in which the combustion can body 10 is installed indoors and a forced intake / exhaust cylinder provided with a fan for intake / exhaust extending to the outside is provided. The exhaust mechanism may be a so-called indoor installation outdoor natural exhaust type in which the combustion can body 10 is installed indoors and the exhaust pipe is extended to the outdoors to perform natural exhaust.
[0010]
Reference numeral 60 denotes a controller which receives a command from the remote controller 70, obtains information from a sensor of each unit of the device, performs calculation and determination based on predetermined software, and outputs a predetermined command to each unit of the device.
An operation control configuration of the controller 60 will be further described. When the reheating alone operation is instructed by the remote controller 70, the bathtub water is heated by performing continuous combustion with a fixed number of reheating and circulating the bathtub water to the combustion can 10 through the reheating circuit 20. Then, when the bathtub temperature reaches a predetermined temperature, the combustion is stopped and the operation is terminated.
When only the hot water supply operation is instructed by the remote controller 70, the hot water supply independent operation is started when the incoming water flow rate sensor 44 of the water inlet pipe 31 detects a certain minimum working water amount or more.
In the hot water supply independent operation, the combustion operation is performed by a combination of the feedforward control (hereinafter referred to as FF control) and the feedback control (hereinafter referred to as FB control). First, the required number of hot water is calculated from the set hot water supply temperature and the like, and the burner 50 is subjected to FF control combustion with the calculated hot water number and the hot water number is corrected by the FB control from the actual hot water temperature. When the corrected required hot water supply number A is greater than or equal to the switching reference number B in the hot water single operation, continuous combustion by proportional control is performed, and when the required number A is less than the switching reference number B, on-off control combustion is performed. , So as to reach the set hot water supply temperature.
In the case of the hot-water supply independent operation, the value of the switching reference number B in the hot-water supply independent operation is changed depending on the type of the exhaust configuration of the combustion can body 10 and the exhaust resistance condition based on whether the wind pressure switch 13 is on or off. That is, most of the exhaust switching reference scale number B when less resistance to the lowest switching reference scale number B _0, and larger switching reference scale number B As the exhaust resistance increases. This value is determined in advance by an experiment, and is stored in the controller 60. That is, for example, four switching reference numbers B are determined and stored depending on whether or not the exhaust configuration is an indoor-installed outdoor natural exhaust type and whether or not the wind pressure switch 13 is on, and the corresponding switching is performed at the time of hot water supply alone operation. The standard number B is adopted.
[0011]
Next, the control configuration of the controller in the case of performing the simultaneous operation of the bath reheating operation and the hot water supply operation will be described with reference to FIG. 2. In this case, in addition to circulating and heating the bath water, it is necessary to set the hot water supply to a predetermined set temperature and to discharge the hot water. Another number is needed for reheating. However, even if combustion is performed with the total number, it is not clear what ratio heat exchange on the hot water supply side and heat exchange on the reheating side will be performed. In addition to the required number of hot water supply A for the calculated hot water supply, the number of fires F is calculated as the number of simultaneous operation start numbers S, and continuous combustion by FF control is started at the number of simultaneous operation start numbers S, followed by FB control. The tap water is set to the temperature set by the above.
When the number F of the preliminary chase-fire is set to a constant value, there is a case where the state becomes unfavorable in control as described above in relation to the exhaust resistance condition. Therefore, a value corresponding to the exhaust resistance condition is obtained in advance by an experiment. Then, this is stored in the controller 60, and is selected and set according to the exhaust resistance condition during operation. In other words, by adopting a larger value of the provisional reheating number F as the exhaust resistance is larger, appropriate combustion is performed according to the magnitude of the exhaust resistance, and several provisional reheating numbers are also determined according to the magnitude of the exhaust resistance. By adopting F, after the start of combustion by the FF control, the hot water supply side is smoothly (rapidly) discharged at the set temperature by the FB control. How do determine the value of the temporary reheating scale number F in accordance with the exhaust resistance is Experiments minimum number of switching reference No. during single hot water supply run B _{0 (minimum} No. which can be obtained a burner is continuously burned In the case of burning by the number obtained by adding the value of the number F of the provisional additional firing to the number (number), the minimum number that can always be continuous combustion by proportional control can be obtained. By determining the number F of the provisional additional firing in this way, it is possible to start the combustion by the simultaneous operation start number S by the continuous combustion.
[0012]
After the simultaneous operation is started, the combustion control is performed by combining the FF control with the FB control. At that time, the total required number T (that is, the sum of the FF control number and the FB control number) is small. Then, it is necessary to switch from continuous combustion by proportional control to on-off control combustion. The reference number for switching between continuous combustion and on-off combustion during the simultaneous operation, that is, the value of the reference number C for switching during the simultaneous operation, depends on the exhaust resistance condition. By using the number F of the provisional additional firing given to the exhaust resistance condition at that time to ₀ , the reference number for switching to the exhaust resistance condition is corrected. Therefore, it is not necessary to change the switching reference number on the hot water supply side according to the exhaust resistance condition, and the minimum switching reference number B in the hot water supply alone operation in which the exhaust resistance condition is most relaxed (the exhaust resistance is lowest). By using ₀ , it is possible to obtain an appropriate simultaneous operation switching reference number C as a whole.
[0013]
The control configuration of the controller 60 during the simultaneous operation will be described again according to the flowchart of FIG. Now, in the bath kettle device with the hot water supply function, when the simultaneous operation of the bath reheating operation and the hot water supply operation is instructed (Yes in S1), the controller 60 first determines whether or not the exhaust mechanism of the device is the indoor installation outdoor natural exhaust type. (S2) and whether the wind pressure switch 13 is on or off is determined (S3, S4).
In steps S2 and S3, when the exhaust mechanism is not the indoor outdoor natural exhaust type (No in S2) and the wind pressure switch 13 is off (No in S3), the controller 60 determines that the exhaust resistance condition is the highest. As a case where the exhaustion resistance is reduced (the exhaust resistance is the smallest), the corresponding smallest value 5.7, which is the smallest value, is selected and set from the number of provisional reheating numbers F obtained and stored in advance in an experiment. Further, as the number S of simultaneous operation start numbers, a value obtained by adding the number F of the tentative chase heating number F = 5.7 to the number A of required hot water supply for hot water supply calculated with respect to the set hot water supply temperature is set. As switching reference scale number C during simultaneous operation, it sets the value of the plus temporary reheating scale number F = 5.7 to the lowest switching reference scale number B ₀ at single hot water supply run (S5).
Similarly, in steps S2 and S4, when the exhaust mechanism is an indoor-installed outdoor natural exhaust type (Yes in S2) and the wind pressure switch 13 is off (No in S4), the controller 60 determines that the exhaust resistance condition is 2 As the case where the exhaustion resistance is reduced second (the exhaust resistance is the second smallest), the corresponding value of No. 8 is selected and set from the number F of the provisional chase-fire numbers obtained and stored in advance in an experiment. In addition, as the number S of simultaneous operation start times, a value obtained by adding the number F of temporary hot water heating to F = 8 to the number A of required hot water supply for hot water supply calculated for the set hot water supply temperature is set. As switching reference scale number C during simultaneous operation, it sets the value of the plus temporary reheating scale number F = 8 to the lowest switching reference scale number B ₀ at single hot water supply run (S6).
Similarly, in Steps S2 and S3, when the exhaust mechanism is not the indoor outdoor natural exhaust type (No in S2) and the wind pressure switch 13 is on (Yes in S3), the controller 60 obtains an experiment in advance. A corresponding value of 8.5 is selected and set from the number of provisional firing numbers F stored and stored. In addition, as the number S of simultaneous operation start, a value obtained by adding the number F of temporary hot water heating to F = 8.5 to the required number A of hot water supply for hot water supply calculated with respect to the set hot water supply temperature is set. As switching reference scale number C during simultaneous operation, it sets the value of the plus temporary reheating scale number F = 8.5 to the lowest switching reference scale number B ₀ at single hot water supply run (S7).
Similarly, in steps S2 and S4, when the exhaust mechanism is an indoor-installed outdoor natural exhaust type (Yes in S2) and the wind pressure switch 13 is on (Yes in S4), the controller 60 determines that the exhaust resistance condition is the highest. As a severe case (the exhaust resistance is the largest), a corresponding value of No. 10 is selected and set from the number of the provisional reheating numbers F obtained and stored in an experiment in advance. Further, as the number S of simultaneous operation start, a value obtained by adding the number F of tentative additional heating No. F = 10 to the number A of necessary hot water supply for hot water supply calculated with respect to the set hot water supply temperature is set. As switching reference scale number C during simultaneous operation, it sets the value of the plus temporary Reheating No. Number translocation number F = 10 to the lowest switching reference scale number B ₀ at single hot water supply run (S8).
[0014]
The controller 60 calculates the number F of the provisional chase-fire, the number S of the simultaneous operation start, and the reference number C of the simultaneous operation switching, and then starts the continuous combustion by the FF control with the number S of the simultaneous operation start. (S9). Then, after the start, control is performed so that the hot water supply side is set to the set hot water temperature by the FB control (S10). During operation, it is monitored whether or not the total required number T, which is the sum of the number of FF control numbers and the number of FB control numbers, is equal to or greater than the reference number C for simultaneous operation switching (S11). Yes), the continuous combustion is performed by the proportional control (S12), and if it is less than (No in S11), the on / off combustion control is performed (S13).
[0015]
【The invention's effect】
According to the bath kettle device with a hot water supply function according to the first aspect of the present invention, as a configuration of the controller, in the case of simultaneous operation of the reheating operation and the hot water supply operation, the required hot water supply for hot water supply is provided. The continuous combustion by feedforward control is started with the number of simultaneous operation start times which is obtained by adding the number of provisional reheating for provision of bath to the number of bath reheating, and the number of provisional reheating is determined by the number of combustion cans. A larger value is obtained in advance as the exhaust resistance increases in accordance with the type of exhaust mechanism of the body and the exhaust resistance condition based on whether the wind pressure switch is on or off, and this value is stored and temporarily set in accordance with the exhaust resistance condition. Select and set the number of reheating units, and after starting simultaneous operation, combine feedback control so that the total required number to be calculated can be reduced to the given number of provisional reheating units by the minimum during hot water supply alone operation. When the switching reference scale number or time of simultaneous operation made by adding the switching reference scale number is, the continuous combustion by proportional control, since the configuration in which the on-off combustion control in the case of less than,
At the start of the simultaneous operation, the operation can be started with an appropriate number of simultaneous operation start signals according to the exhaust resistance conditions, and good combustion can be ensured. In addition, since the number of tentatively-fired fires is selected and set according to the exhaust resistance for the actually required number, the difference between the number of simultaneous start operations and the actually required number can be reduced. In addition, immediately after the start of the operation, the adjustment up to the actually required number by the feedback control can be performed. Therefore, the time when the hot water supply overshoots or undershoots can be shortened.
In addition, since the same reference number of simultaneous firing switching is set using the same number of temporary firing as used in the calculation of the number of simultaneous firing start numbers, the number of simultaneous start switching and the simultaneous operation The time switch reference number can be set without the difference becoming too large, and after starting the operation, it is possible to quickly switch from continuous combustion by proportional control to on / off control combustion as needed. The overshoot of hot water supply can be promptly eliminated.
[Brief description of the drawings]
FIG. 1 is an overall schematic configuration diagram of a bath kettle device with a hot water supply function showing an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a control configuration of a controller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Combustion body 11 Exhaust gas collecting chamber 12 Exhaust mechanism 13 Wind pressure switch 20 Additional heating circuit 23 Heat exchange coil 30 Hot water supply circuit 31 Water inlet pipe 32 Hot water pipe 33 Heat exchange coil 50 Burner 60 Controller

Claims (1)

Equipped with one burner that performs heat exchange heating for bath reheating and heat exchange heating for hot water supply. As a configuration of the controller, when the reheating alone operation is performed, a fixed number of reheating is performed by feedforward control. Continuous combustion is performed, and when the hot water supply alone operation is performed, the combination of feedforward control and feedback control is performed. Performs on-off combustion control, and in the case of the hot water supply alone operation, depending on the type of the exhaust mechanism of the combustion can body and the exhaust resistance condition depending on whether the wind pressure switch is on or off, a larger value is set as the exhaust resistance increases. Bath kettle device with hot water supply function that selects and sets the corresponding switching reference number from the switching reference numbers stored in advance In the case of the simultaneous operation of the reheating operation and the hot water supply operation as the configuration of the controller, a simultaneous reheating operation is performed by adding the number of temporary reheating units temporarily provided for bath reheating to the required number of hot water supply units for hot water supply. The continuous combustion by feedforward control is started with the number of operation start times, and the number of the provisional follow-up firing is determined according to the type of exhaust mechanism of the combustion can body and the exhaust resistance condition depending on whether the wind pressure switch is on or off. A larger value is obtained in advance as the exhaust resistance is larger, the value is stored in advance, and the corresponding number of provisional chase-fire numbers is selected and set according to the exhaust resistance condition. The required total number is equal to or greater than the simultaneous operation switching reference number obtained by adding the minimum number of switching reference numbers at the time of the hot water supply alone operation to the given number of the provisional additional heating number. Continuous combustion was carried out, under the hot water supply function-equipped bathtub apparatus being characterized in that a configuration for performing on-off combustion control when made by the proportional control when made.

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