JPH0861776A - One-boiler dual-circuit type water heater - Google Patents

Abstract

PURPOSE: To provide a one-boiler dual-circuit type water heater which is free from danger of hot water being fed as boiling water even when water below the minimum quantity of working water flows through a circuit for general heating of water during the bath followup boiling operation. CONSTITUTION: In a one boiler dual circuit type water heater made up of a heat exchanger section 21 of a circuit 20 for general heating of water and a heat exchanger section 31 for a circuit 30 for bath followup boiling in one heat exchange boiler body 10 having a common burner 11, a controller 50 is provided to control the general water heating temperature below a fixed value monitoring a supply hot water sensor 26 of the circuit 20 for general heating of water even when the amount of hot water flowing to the side of the circuit 20 for general heating of water is below the minimum quantity of working water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can comprising a heat exchanger part of a general hot water supply circuit and a heat exchange part of a bath reheating circuit in one heat exchange can body having a common burner. The present invention relates to a two-circuit hot water supply device.

[0002]

2. Description of the Related Art Conventionally, one can and two circuit type heat exchanger parts of a general hot water supply circuit and a heat exchanging part of a bath reheating circuit are constructed in one heat exchange can body having a common burner. In the hot water supply device, the minimum operating water amount for each of the general hot water supplying operation and the bath reheating operation is determined, and each operation is not started unless the water amount of the minimum operating water amount or more flows. Therefore, for example, when there is running water of less than the minimum working water volume on the general hot water supply circuit side during the bath reheating operation, it is considered that the bath reheating operation is independent, so the general hot water supply circuit side has a special The control operation was not performed.

[0003]

However, in the one-can, two-circuit type hot water supply device having the above-described structure, for example, when the hot water supply run is opened during the bath reheating operation, the hot water supply cullan is opened to the minimum. When the amount of water less than the amount of working water flows, only the bath reheating operation is continuously operated alone on the device, and the general hot water supply is not in operation. Therefore, with respect to water that is less than the minimum working water volume that is actually discharged from the general hot water supply circuit, there is a risk that the hot water in a boiling state will be supplied with the water at a natural temperature without any temperature control.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional apparatus, and makes it possible to supply hot water as boiling water even when a water amount less than the minimum working water amount flows in the general hot water supply circuit during the bath reheating operation. It is an object of the present invention to provide a 1-can 2-circuit type hot water supply device that can eliminate various risks.

[0005]

In order to achieve the above object, the one-can two-circuit type hot water supply device of the present invention has a common heat exchange part of a hot water supply circuit and a heat exchange part of a bath reheating circuit. 1 heat exchange can body with a burner
In the can 2 circuit hot water supply device, during the bath reheating operation, even if the flow rate flowing through the general hot water supply circuit side is less than the minimum operating water amount, the general hot water supply temperature sensor monitors the hot water supply temperature sensor. It is characterized in that a controller is provided to control the temperature to be below a certain temperature.

[0006]

According to the above feature of the present invention, during the bath reheating operation, even when the amount of water flowing to the general hot water supply circuit side is less than the minimum operating water amount (including zero water amount), the general hot water supply circuit is controlled by the controller. The hot water supply temperature sensor is monitored, and when the hot water supply temperature sensor has a high temperature exceeding a certain temperature, control is performed so that the temperature becomes equal to or lower than the certain temperature. This solves the problem that a small amount of water becomes hot water and is supplied from the general hot water supply circuit.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is an overall configuration diagram of a 1-can 2-circuit type hot water supply device showing an embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes an instant heating type heat exchange canister, which is provided in common to the general hot water supply circuit 20 and the bath reheating circuit 30. The general hot water supply circuit is provided in the heat exchange can body 10. 20
The heat exchange section 21 and the heat exchange section 31 of the bath reheating circuit 30 are arranged. The heat exchange can body 10 is provided with a common burner 11 and a blowing means 12. As the burner 11, a gas burner or an oil burner can be used. 13 is a burner
11 input control valves. The general hot water supply circuit 20 is a circuit for supplying water from hot water to hot water and supplying it, and a bypass passage 22 bypassing the heat exchange can body 10 is provided in the circuit 20 together with a bypass water amount control valve 23. Bypass 22
The water supply flow rate sensor 24 and the water supply temperature sensor 25 are provided in the general hot water supply circuit 20 at a position upstream from the branch point of the hot water supply temperature sensor 26 and the overflow prevention device 27 at a position downstream of the confluence point of the bypass passage 22. Is provided, and a hot water supply calan 28 and the like are provided at the end.

The controller 50 controls the entire apparatus, and inputs information from the incoming water flow rate sensor 24, the incoming water temperature sensor 25, the hot water supply temperature sensor 26, the bath temperature sensor 32, the water flow switch 34, and other sensors. Input the set temperature information from a remote controller (not shown), perform the necessary calculations, and send the necessary commands to the burner 11, blower 12, input control valve 1
3, output to bypass water amount control valve 23, overflow preventer 27, circulation pump 33 and the like.

Now, when the general hot water supply operation is performed alone, the controller 50 detects when the incoming water flow rate sensor 24 detects more than the minimum working water amount for the general hot water supply operation by opening the hot water supply curran 28 at the end. Starts combustion by the burner 11, and supplies hot water at the set hot water supply temperature by a combination of feedforward control and feedback control.
In addition, when the bath reheating operation is performed independently, the controller is turned on by turning on the bath reheating operation switch.
Drives a circulation pump 33, which causes a water flow switch 34
When is turned on, the controller 50 starts the combustion of the burner 11 with a constant input value, for example, and the operation is continued until the bath temperature sensor 32 detects the set bath temperature. When the general hot water supply operation and the bath reheating operation are performed at the same time, that is, when the water flow rate sensor 24 of the general hot water supply circuit 20 detects the minimum operating water amount or more and the bath reheating operation switch is turned on, the controller is 50, feedforward control is performed with a value obtained by adding the input value for bath reheating operation to the feedforward input value in the above-described general hot water supply operation, and feedback control is performed to supply hot water at a predetermined set hot water supply temperature. Heat the bath temperature to the set temperature.

In the present invention, the controller
When the bath reheating operation is performed independently, 50 always monitors the hot water supply temperature sensor 26 of the general hot water supply circuit 20, and when the hot water supply temperature sensor 26 detects a high temperature exceeding the constant temperature T _1. Is configured so that the input value of the burner 11 is reduced and the temperature is controlled to be equal to or lower than the constant temperature T ₁ . The constant temperature T ₁ can be set in advance, for example, as a temperature that causes burns when exceeding the temperature. Of course, the constant temperature may be set to match the set hot water supply temperature. Even when the bath reheating operation is performed independently as described above, the hot water supply temperature sensor 26 in the general hot water supply circuit is used.
The reason why the hot water supply temperature is monitored so that the hot water supply temperature does not exceed the constant temperature T _{1 is} that the hot water supply karan 28 is opened by the user or the like.
This is because there is a case where the amount of water less than the minimum amount of working water may be poured from the hot water supply curran 28 or the like to the outside through the general hot water supply circuit 20 at an extremely high temperature. That is, when the general hot water supply amount is less than the minimum operating water amount, the general hot water supply operation is not performed in terms of the device, and the bath additional heating operation is performed alone. But,
Even if the amount of water is less than the minimum amount of working water, if the amount of water is actually flowing, it will be heated by the combustion of the bath reheating operation, and it will be poured from the hot water supply currant 28 or the like. In this case, since the water is heated at its discretion, high-temperature water such as boiling water is poured, which may cause burns to the user. With the configuration of the present invention, the temperature of the water flow flowing through the general hot water supply circuit is constantly monitored while the burner 11 is burning, and is controlled to a certain temperature or less,
The problem of pouring hot water is solved.

[0012]

According to the present invention, there is provided the above construction.
According to the 1-can 2-circuit type hot water supply device described in (1), the heat exchanger part of the general hot water supply circuit and the heat exchange part of the bath reheating circuit are formed in one heat exchange can body having a common burner. In the 1-can, 2-circuit hot water supply device, during the bath reheating operation, even if the flow rate flowing through the general hot water supply circuit side is less than the minimum operating water amount, the hot water temperature sensor of the general hot water supply circuit is monitored. Since a controller that controls the hot water supply temperature to a certain temperature or less is provided, even if there is a case where less than the minimum operating water volume flows into the general hot water supply circuit during the bath reheating operation, it is kept constant. The temperature is controlled to be equal to or lower than the temperature, and it is possible to reliably prevent dangerous high-temperature water from being poured.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a one-can two-circuit water heater according to an embodiment of the present invention.

[Explanation of symbols]

 10 Heat exchange canister 11 Burner 20 General hot water supply circuit 21 Heat exchange section 24 Incoming water flow rate sensor 25 Incoming water temperature sensor 26 Hot water supply temperature sensor 28 Hot water supply curran 30 Bath reheating circuit 40 Bathtub 50 Controller

Claims (1)

[Claims] 1. A one-can two-circuit water heater in which a heat exchanger part of a general hot water supply circuit and a heat exchange part of a bath reheating circuit are formed in one heat exchange can body having a common burner. During the bath reheating operation, even if the flow rate of the general hot water supply circuit side is less than the minimum operating water amount, the hot water temperature sensor in the general hot water supply circuit is monitored to keep the general hot water temperature below a certain temperature. A 1-can 2-circuit type hot water supply device, which is provided with a controller for controlling.