JP3222185B2 - 1 can 2 circuit water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can two-circuit water heater in which a heat exchanger of a hot water supply circuit and a heat exchanger of another circulation heating circuit are provided in one combustion can body.

[0002]

2. Description of the Related Art Conventionally, two heat exchangers each comprising, for example, a hot water supply circuit and a bath circulation heating circuit, for example, an instantaneous heating type heat exchanger are passed through a single combustion vessel so that hot water supply and bath heating can be carried out simultaneously or simultaneously. There is provided a one can, two circuit water heater that can be performed separately. In the case of this one-can two-circuit water heater, the degree of heat reception of each heat exchanger is greatly changed depending on which heat exchanger is arranged so as to easily receive heat.
Conventionally, in consideration of the necessary heat absorption when the hot water supply circuit is used alone and the excessive thermal stress applied to the heat exchanger in the hot water supply circuit when the bath circulation heating circuit is used alone, the heat exchanger in the hot water supply circuit is far from the flame, The circulation heating circuit was arranged closer to the flame.

[0003]

However, when the heat exchanger is arranged as described above, for example, in the case of the hot water supply circuit alone, the heat receiving state is not excessive and just good when the hot water supply circuit is operated alone.
On the other hand, when the hot water supply circuit and the bath circulation heating circuit are operated at the same time, the heat receiving state on the hot water supply circuit side deteriorates, the hot water supply temperature does not reach the set temperature, and particularly in winter, etc., there is a problem with showers and other hot water supply. There was a problem. Therefore, the present invention solves the above-mentioned disadvantages of the prior art, and in a one-can, two-circuit type water heater, not only when each circuit is operated independently but also when two circuits are simultaneously operated, the circuit on the priority side is used. It is an object of the present invention to provide a one-can, two-circuit water heater in which the temperature of the water can be surely adjusted and excessive heat stress is not applied to the heat exchanger of the circuit whose priority is given.

[0004]

In order to solve the above-mentioned object, a one-can two-circuit water heater according to the present invention comprises a heat exchanger of a hot water supply circuit and a heat exchanger of another circulation heating circuit in one combustion vessel. And a two-circuit type water heater provided separately from each other, wherein during the simultaneous operation of both circuits, the hot water supply which is given priority
When the hot water temperature of the circuit does not reach the set temperature, the flow rate of the other non-priority circulating heating circuit is automatically reduced.

[0005]

[Function] Prioritized during simultaneous operation of both circuits of one can and two circuits
If the hot water temperature of the hot water supply circuit does not reach the set temperature, non
Since the flow rate of the other priority circulating heating circuit is automatically reduced, the heat absorption ratio of the other non-priority circulation heating circuit decreases, and the heat absorption rate of the priority hot water supply circuit increases. Thereby, the hot water temperature of the hot water supply circuit which has been given priority rises, and hot water of the set temperature can be obtained. As described above, the tendency for the amount of heat received by the hot water supply circuit to be prioritized during the simultaneous operation to be too small is corrected, and accordingly, the amount of heat received by the hot water supply circuit itself that is prioritized is reduced as a whole. It can be, therefore upon the isolated operation of the hot water supply circuit which is a priority, and a non-priority
And during independent operation of the other circulating heating circuit, the priority and the hot water supply
The disadvantage that the heat exchanger of the circuit receives an excessive amount of heat or receives a large thermal stress is eliminated.

[0006]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a control flowchart by a controller.

In FIG. 1, one combustion can 10 is provided with an instantaneous heating type heat exchanger 21 of a hot water supply circuit 20 and a bath circulation heating circuit 30.
Through the instantaneous heating type heat exchanger 31 to constitute a one-can, two-time type water heater. Instantaneous heating type heat exchanger of hot water supply circuit 20
Numeral 21 is arranged farther from the flame of the burner 11, and the instantaneous heating type heat exchanger 31 of the bath circulation heating circuit 30 is arranged closer to the flame of the burner 11. The combustion can 10 is provided with the burner 11 having a fuel nozzle and a blower fan. The hot water supply circuit 20 is provided with an incoming water temperature sensor 22, an incoming water flow rate sensor 23, and an incoming water temperature sensor 24. Further, a circulation pump 32 is provided in the bath circulation heating circuit 30, and water in the bathtub 40 is circulated through the circuit 30.

Reference numeral 50 denotes a controller, and reference numeral 60 denotes a main remote controller. This main remote control 60 has a hot water supply operation switch,
In addition to the hot water supply temperature setting knob, a bath operation switch, a bath temperature setting knob, and the like are provided. In addition, a bath remote controller (not shown) dedicated to a bath is provided in the bathroom. Controller 50
When the hot water supply operation switch is turned on independently, on the condition that the hot water supply circuit 20 is flowing over the minimum operating water amount,
The burner 11 of the combustion can 10 is ignited and burned in a predetermined order. Then, the required combustion amount is calculated from the incoming water temperature and the incoming water flow rate with respect to the set hot water supply temperature, feed-forward control of the burner 11 combustion is performed, and feedback control of the burner 11 combustion is performed based on the difference between the hot water supply temperature and the set hot water supply temperature. I do. Further, when the bath operation switch is turned on alone, the controller 50 turns on the circulation pump 32 and turns on the bath circulation heating circuit 30.
The burner 11 of the combustion can 10 is ignited in a predetermined order under the condition that a minimum amount of the working water is flowing at least, and burns at a predetermined combustion amount. At this time, the circulating pump 32 is operated with a large capacity so that a relatively large constant flow rate flows. When the bath water temperature reaches the set temperature, the operation is stopped.

Next, the control by the controller 50 when both the hot water supply operation switch and the bath operation switch are turned on will be described with reference to FIG. Now, when the bath operation switch is turned on during the single hot water supply operation (S1, S2), the controller 50 starts the operation of the circulation pump 32 with a large capacity (S3). Then, the controller 50 performs feedforward control and feedback control so that the hot water supply temperature continues to be the set hot water supply temperature (S4).
It is determined whether the hot water supply temperature falls within a certain temperature range centered on the set hot water supply temperature (S5).
32 is switched to low capacity (S6). In the above, the case where the hot water supply temperature does not fall within a certain temperature range centered on the set hot water supply temperature means that the circulation on the bath side is started, so that the heat generated by the burner 11 is supplied to the heat exchanger 31 on the bath side. As a result, the heat exchanger 21 on the hot-water supply side is not sufficiently heated, and the hot-water supply temperature falls below the set hot-water supply temperature by a certain temperature or more. And, by the capacity of the circulation pump 32 being switched to a small amount, the heat absorption of the heat exchanger 32 on the bath side is reduced,
The amount of heat absorbed by the heat exchanger 21 on the water heater side is increased, and a predetermined set hot water supply temperature can be obtained.

On the other hand, when only the bath circulation heating operation is performed (S7), the circulation pump 32 is operated with a large capacity,
The bathtub water circulating in the heat exchanger 31 is heated by the combustion of the burner 11, and when the hot water supply operation switch is turned on during this bath circulation heating operation (S8), the controller
Assuming that 50 is a hot water supply flow rate equal to or greater than the minimum working water amount,
The combustion of the burner 11 is switched to feedforward control and feedback control so that the hot water supply temperature becomes the set hot water supply temperature (S4). If the hot water supply temperature does not fall within the set temperature range within a predetermined time (S5), the circulation pump
The ability of 32 is switched to small (S6).

[0011] In the above description, the certain time period is, for example, in the range from ten and several seconds to several ten seconds. Or In the above SL embodiment it was, but switched circulation pump 32 to the capacity large and small, but it may also be to switch to the two or more stages depending on the situation.
Further, in the above-described embodiment, the one-can two-circuit including the hot water supply circuit and the bath circulating heating circuit is used. However, the one-can two-circuit including the hot water supply circuit and the circulating heating circuit for heating, or the one-can two circuit including the other combination. It may be a type water heater. Also one can 2
The importance of the circuit, the required amount of heat in the circuit, and the degree of durability against thermal stress are determined by which circuit in the circuit, the one whose heat exchanger is farther away from the flame, and which circuit has the higher temperature control. Can be selected.

[0012]

According to the first aspect of the present invention, a heat exchanger of a hot water supply circuit and a heat exchanger of another circulation heating circuit are provided in one combustion vessel. And a one-circuit two-circuit water heater provided separately.
During the simultaneous operation of both circuits, if the hot water temperature of the hot water supply circuit which has been prioritized does not reach the set temperature, the flow rate of the other non-priority circulating heating circuit is automatically reduced. since the two circuits Te odor case of simultaneous operation, the flow rate through the insufficient heating of the hot water supply circuit side that is preferentially a fed-water circuit
The temperature of the hot water supply circuit must be compensated without incurring
Holding and flow rate maintenance can be performed satisfactorily . In addition, the priority of the hot water supply circuit itself is
No measures have been taken to reduce flow
The amount of heat received can be reduced compared to the conventional case.
Wear. Therefore, when the hot water supply circuit is operated alone,
Only the other circuits are used and the heat exchanger in the hot water supply circuit is empty
Heat exchanger in the hot water supply circuit
To prevent or prevent excessive heat reception
Can cause excessive heat stress on the heat exchanger in the hot water supply circuit.
Can be prevented and its durability can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a control flowchart by a controller.

[Explanation of symbols]

 10 Combustion body 11 Burner 20 Hot water supply circuit 21 Instantaneous heating type heat exchanger 30 Bath circulation heating circuit 31 Instantaneous heating type heat exchange 32 Circulation pump 40 Bathtub 50 Controller 60 Remote control

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinji Sasaki 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Noritsu Co., Ltd. (56) References JP-A-58-187741 (JP, A) (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24H 1/00

Claims (1)

(57) [Claims] 1. A one-can two-circuit water heater in which a heat exchanger of a hot water supply circuit and a heat exchanger of another circulation heating circuit are separately provided in one combustion can body, wherein both circuits are simultaneously operated. During operation, if the hot water temperature of the hot water supply circuit which has been prioritized does not reach the set temperature, the other non-priority circulating heating
A one-can, two-circuit water heater characterized in that the flow rate of the circuit is automatically reduced.