JPH0646095B2 - Hot water supply system with heating function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a hot water supply apparatus with a heating function capable of both heating and hot water supply.

<Prior Art> As a hot water supply device with a heating function capable of both heating and hot water supply, there is a device described in Japanese Patent Application No. 62-10585. This device performs on-off control for temperature adjustment for heating operation, and performs so-called proportional control for temperature adjustment for hot water supply operation by increasing or decreasing the combustion amount and the blown air amount according to the hot water supply temperature. When the heating operation and the hot water supply operation are performed at the same time, the blowing amount and the combustion amount are proportionally controlled according to the hot water supply temperature on the hot water supply side, and the heating side is turned on / off.

<Problems to be Solved by the Invention> However, in the above-described conventional device, one blower is used in common, so that the amount of blown air is increased in proportion to the capacity of the hot water supply side when both hot water supply and heating are used. Then, the combustion on the heating side also has to increase in accordance with the amount of blown air. Then, it becomes easier for the combustion to become too strong compared to the medium temperature (warm water) on the heating side to be set, and even if the combustion is controlled to be turned on and off, the temperature fluctuations above and below the set temperature are large. There was a drawback.

<Purpose> Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and provides the blower 1
An object of the present invention is to provide a hot water supply device with a heating function in which the temperature on the heating side does not fluctuate significantly with respect to the set temperature even when the hot water supply and the heating are simultaneously operated on the table.

<Means for Solving Problems> In the present invention, the heat exchangers 2 and 4, the combustion burners 3 and 5, the opening / closing valves 7 and 8 for supplying fuel to the combustion burners 3 and 5, and the fuel supply amount adjustment. The valves 9 and 10 are separately provided for hot water supply and heating, respectively, and the blower fan 6 is shared by both to blow air at a predetermined fixed distribution, and when the hot water supply or heating is used alone, the blower fan 6 is used. And the amount of fuel supplied to the burners 3 and 5 by the fuel supply amount control valves 9 and 10 are proportionally controlled according to the hot water supply capacity and the heating capacity, respectively, and the amount of air blown by the blower fan 6 when used simultaneously. Is a hot water supply device with a heating function that is changed preferentially according to the capacity of the hot water supply side, and when the hot water supply and the heating are simultaneously used, the heating side has a combustion amount according to the priority changed air flow rate. Switch to on-off combustion operation Is basically characterized in that a controller 12 is set lower than that during the single operation of the combustion stop temperature of the heating side with. Further, as an embodiment of the present invention, a controller 12 may be provided that sets the combustion stop temperature on the heating side when hot water supply and heating are simultaneously used in proportion to an increase in the amount of blown air as compared to when operating alone.

<Operation> When the amount of air blown increases due to simultaneous use on the hot water supply side, the amount of air blown on the heating side also increases, and the combustion amount on the heating side also increases accordingly. Therefore, on the heating side, temperature control can be continued by controlling combustion on / off. And in the present invention, for simultaneous use, the stop temperature of the on-off combustion on the heating side, which is strongly combusted according to the increase in the air flow,
Since the controller 12 is set to a lower level than when operating independently, even if the heating side is used simultaneously with the hot water supply side, the heating medium (hot water) is heated by the after-boiling due to the large temperature history generated by strong combustion ON / OFF combustion. It is possible to reliably prevent the desired temperature from being greatly exceeded.

<Embodiment> FIG. 1 is an overall configuration diagram of the device of the present invention, FIG. 2 is a combustion control flowchart, and FIG. 3 is a diagram showing a temperature rise curve.

A heat exchanger 2 for hot water supply and a combustion burner 3 are provided in the can body 1, and a heat exchanger 4 and a combustion burner 5 for heating are provided. Combustion air is blown from below the can body 1 by a blower fan 6. The blower fan 6 is commonly used for hot water supply and heating, and is designed so that the amount of blown air is sent in a predetermined distribution in proportion to the combustion capacity on the hot water supply side and the combustion capacity on the heating side. On-off valves 7 and 8 and combustion supply amount control valves 9 and 10 are provided in the fuel supply paths to the burners 3 and 5, respectively. The control of the on-off valves 7 and 8, the fuel supply amount adjusting valves 9 and 10 and the blower fan 6 is performed by a controller 12 according to a command from a remote control panel 11. The heating-side hot water circulation path is provided with a branching circulation path for reheating to the bathtub 13 so that the circulation path can be shared.

For the combustion on the hot water supply side, the hot water supply operation switch is turned on by the remote control panel 11 and the hot water supply lan (not shown) is opened, so that the incoming water temperature and the incoming water temperature from the incoming water temperature sensor and the incoming water amount detection sensor of the incoming water pipe on the hot water supply side are not shown. The amount of water is input to the controller 12, and a predetermined air flow rate and combustion air supply rate are calculated from the hot water supply temperature set by the remote control panel 11 and the water input temperature and the water flow rate, and the air blow fan 6 and the fuel supply rate are adjusted. This is performed by outputting a predetermined control amount command to the valve 9. During hot water supply, the actual hot water supply temperature is detected by a hot water supply temperature sensor (not shown), a correction amount is calculated from the temperature and the set hot water supply temperature by the controller 12, and feedback control to the blower fan 6 and the fuel supply amount control valve 9 is performed. Be seen. As described above, the combustion on the hot water supply side is controlled by the burner 3 depending on the set hot water supply temperature.
Proportional control operation of combustion is performed.

In the case of the independent operation on the heating side, the hot water supply temperature is automatically set according to the set heating temperature or heating intensity, and the controller 12 performs the proportional control operation as in the case of the hot water supply operation.

As a configuration of the controller 12, when the hot water supply side and the heating side are simultaneously operated, the air blowing amount by the blower fan 6 is configured to be preferentially changed according to the capacity of the hot water supply side, and the heating side is prioritized. It is configured to switch to the on / off combustion operation with the combustion amount according to the changed air flow rate, and to set the combustion stop temperature on the heating side to be lower than that in the single operation. In this case, the hot water supply side is continuously operated in proportional control.

Since the capacity on the hot water supply side is usually configured to be larger than the capacity on the heating side, when operating the hot water supply side and the heating side at the same time, the required air flow rate is greatly changed according to the combustion conditions on the hot water supply side. Naturally, the amount of air blown to the heating side also increases. Therefore, on the heating side, in order to maintain the proper combustion, the fuel supply amount also has to increase in accordance with the increase in the blown air amount.
As a result, the combustion capacity on the heating side increases, so that the controller 12 switches the heating side to ON / OFF combustion during the simultaneous operation. This allows the desired temperature control to continue.

The on-off combustion operation will be further described with reference to FIG. Now, in FIG. 3, in the case where the set hot water temperature during the independent operation on the heating side is set to T ₀ , when the heating side and the hot water supply side are simultaneously operated, the control 12 The combustion stop hot water temperature on the heating side is set to a temperature lower by ΔT than the set hot water temperature T ₀ in the independent operation. Therefore, the combustion is stopped when the warm water temperature T on the heating side becomes T ₀ −ΔT or more. By setting ΔT lower as described above, the effect is great especially when the temperature of the hot water on the heating side is measured at a position before the heat exchanger 4. That is, in this case, the hot water is largely heated by the burner 5 that is strongly combusted while passing through the heat exchanger 4. Therefore, unless the combustion stop temperature is set low in advance, the heat exchanger 4
This is because the hot water that has come out of will greatly exceed the set hot water temperature T ₀ . Of course, even when the measurement of the hot water temperature is performed at the place where the hot water comes out from the heat exchanger 4, the hot water temperature is further increased by the accumulated heat in the burner 5 that is burned strongly, even after the burner combustion is stopped. to temperature not exceed more than set the hot water temperature T ₀ is not it is necessary to preset the combustion stop temperature lower than the hot water temperature T _0. The temperature of ΔT may be set to a constant temperature in advance at a temperature of, for example, 10 ° C. or less depending on the capacity difference between the hot water supply side burner 3 and the heating side burner 5 to be installed, and the hot water temperature measurement position on the heating side. Further, ΔT may be changed in a direction of increasing in proportion to an increase in the amount of air blown by the air blowing fan 6.

A solid line A in FIG. 3 is a heating-side hot water temperature curve when the hot water is used simultaneously according to the present invention. From hot water set temperature T ₀ Δ
Since the combustion is stopped at a temperature lower by T, the hot water temperature does not greatly exceed T ₀ . On the other hand, the one-dot chain line B
Is a hot water temperature curve on the heating side of a conventional device in which ΔT is not set and is turned on and off at T ₀ . The hot water temperature greatly exceeds the set temperature T ₀ after the combustion is stopped. A broken line C is a temperature curve during heating independent operation by proportional control operation.

<Effect> The present invention is configured as described above, and when the hot water supply and the heating are simultaneously used, the heating side is switched to the on-off combustion operation with the combustion amount according to the priority changed air flow rate and the combustion stop temperature on the heating side is independently operated. Since the controller 12 is set to be set lower than the time, it is possible to eliminate the inconvenience that the hot water temperature on the heating side greatly exceeds the set hot water temperature even when the hot water supply side operation is performed at the same time.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of the device of the present invention, FIG. 2 is a combustion control flowchart, and FIG. 3 is a diagram showing a temperature rise curve. 1: Can body, 2: Heat exchanger for hot water supply 3: Combustion burner, 4: Heat exchanger for heating 5: Combustion burner, 6: Blower fan 7, 8: Open / close valve 9, 10: Fuel supply amount adjustment Valve 11: Remote control panel, 12: Controller

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area F24H 1/48

Claims (2)

[Claims] 1. Heat exchangers 2, 4; combustion burners 3, 5; open / close valves 7, 8 for supplying fuel to the combustion burners 3, 5; and fuel supply amount control valves 9, 10 for hot water supply, respectively. And the fan 6 for heating are separately provided, and the fan 6 for air blow is shared by both fans for a predetermined fixed distribution, and the amount of air blow and the fuel supply amount by the fan 6 for air blow are adjusted when hot water supply or heating is used alone. The amount of fuel supplied to the burners 3 and 5 by the valves 9 and 10 is proportionally controlled according to the hot water supply capacity and the heating capacity, respectively, and at the time of simultaneous use, the air flow rate by the blower fan 6 is prioritized according to the hot water supply capacity. In the hot water supply device with a heating function, the heating side is switched to the on / off combustion operation with the combustion amount according to the priority changed air flow rate when the hot water supply and the heating are simultaneously used. Combustion stop temperature A water heater with a heating function, which is provided with a controller 12 that is set to a lower level than when operated alone. 2. The controller 12 according to claim 1, further comprising a controller 12 for setting the combustion stop temperature on the heating side at the time of simultaneous use of hot water supply and heating to be lower in proportion to an increase in the amount of blown air than at the time of single operation. Hot water supply system with heating function.