JP2921177B2 - Water heater with bath kettle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater with a bath kettle mainly used for home use, which uses oil or gas as a heat source.

[0002]

2. Description of the Related Art In general, in a water heater with a bath kettle having a common combustion burner in which the amount of combustion can be varied by a one-can two-channel heat exchanger sharing heat-absorbing fins, the bath is heated from the time of simultaneous operation of hot water supply and bath reheating. When the reheating operation is stopped, the temperature of the hot water is temporarily increased due to a delay in the change in the amount of combustion or the release of heat retained by the combustion burner, and high-temperature water is discharged, which is uncomfortable in use. . In order to reduce the temporary rise in hot water supply temperature, a mixing tank is provided at the outlet of the heat transfer pipe for hot water supply, and the rise in tap water temperature is reduced by the action of mixing high-temperature water with other hot water in the tank. Was.

[0003]

In the case of such a conventional mixing tank system, when a desired hot water supply is desired, a temporary rise in the hot water supply temperature is mixed in the mixing tank to reduce fluctuations in the rise in the tap water temperature. Therefore, a large-capacity mixing tank is required, and a certain amount of fluctuation can be reduced, but it cannot be expected to a comfortable level.

Accordingly, the present invention solves the above-mentioned conventional problems, and reduces a temporary high-temperature hot water supply immediately after stopping the bath reheating operation, and has a compact water heater with a small fluctuation in the hot water temperature. The purpose is to provide.

[0005]

Means for Solving the Problems To achieve the above object, a water heater with a bath kettle according to the present invention comprises a heat transfer tube for hot water supply sharing heat absorbing fins, and a two-canal water channel provided with a heat transfer tube for bath. Heat exchanger, a burner for heating the heat exchanger, a circulating pump for circulating bath water in the bath heat transfer tube, and a connection between the inlet side and the outlet side of the hot water supply tube, A bypass water supply circuit having a valve;
A control device for controlling hot water supply and bath heating.
When the bath heating operation is stopped from the simultaneous operation of heat,
After opening the solenoid valve for a predetermined time after the ring pump has stopped,
To suppress the rise in hot water supply temperature that occurs when the bath heating operation is stopped
It was made .

[0006]

According to the present invention, the temporary high-temperature water mixes with the water in the bypass water supply channel by opening the solenoid valve in the bypass water supply channel for a certain period of time immediately after the bath reheating operation is stopped. In addition, it is possible to reduce the temperature rise of the hot water and to reduce the fluctuation of the hot water temperature.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a heat transfer tube 2 for hot water supply is provided above a burner 4.
And a one-can two-channel heat exchanger 1 having a bath heat transfer tube 3, and the hot water and the bath water 13 are heated by the combustion heat of the combustion burner 4. The bath circulation circuit 12 circulates and heats the bath water 13 through a circulation pump 11, a bath water temperature thermistor 16 for detecting a bath water temperature, a heat transfer tube 3 for a bath, and a bath water temperature thermistor 17 for detecting a bath water temperature. . Hot water supply circuit 5
Is a flow rate sensor 14 for detecting the flow rate of feed water, a feed water temperature thermistor 15 for detecting feed water temperature, a heat transfer pipe 2 for hot water supply, a mixing section 11 for mixing bypass feed water and hot water from the heat exchanger 1,
It is connected to a hot water supply temperature thermistor 10 that detects the temperature of tap water. The control unit 9 includes a flow rate sensor 14, a feedwater temperature thermistor 1,
5, hot water supply temperature thermistor 10, bath water temperature thermistor 1
6. Combustion burner 4 at the signal of bath hot water temperature thermistor 17,
The solenoid valve 6 and the circulation pump 11 are controlled.

The operation of the above configuration will be described based on the sequence of FIG. When the tapping is started, the flow rate sensor 14 detects the flow rate, the combustion starts, and the control unit 9 adjusts the combustion amount of the combustion burner 4 so as to reach a preset tapping temperature. Further, when the bath reheating operation is started, the circulation pump 11 operates to heat the bathtub water 13, so that the combustion amount of the combustion burner 4 is increased by adding the combustion amount of the bath reheating operation to the hot water supply operation. . Thereafter, when only the bath reheating operation is stopped, the circulation pump 11 stops, and at the same time, the combustion amount of the burner 4 decreases to the amount of the hot water supply operation. Further, the solenoid valve 6 of the bypass water supply circuit is opened for a time set in advance by the control unit 9, and is closed after the set time. That is, the water flows into the bypass water supply circuit 7 immediately after the stop of the bath reheating, and is mixed with the hot water heated by the hot water supply heat transfer tube 2 in the mixing section 8 at the outlet of the hot water supply heat transfer tube 2.

During the set time for opening the bypass solenoid valve 6, the signals of the flow rate sensor 14, the supply water temperature thermistor 15, the bath water temperature thermistor 16, and the bath water temperature thermistor 17 are set so as to minimize the fluctuation of the water temperature. Processed by the control unit 9,
The optimal time is set. (On the actual side, the opening time is shorter as the flow rate increases, and the shorter the difference between the bath hot water temperature and the bath hot water temperature, the better result is given.) Reduce hot water temperature fluctuations.

[0010]

EFFECT Immediately after stopping the bath reheating operation from simultaneous operation of reheating the hot water supply and a bath, since the bypass water bypass water supply circuit is the optimum time flow Suyo, bath heating stop
Comfortable hot water supply is obtained because the temporary hot tapping of hot water is reduced which occurs immediately after, can be reduced hot water temperature variations.

Immediately after the bath reheating operation is stopped, the bypass water is supplied to the bypass water supply circuit for the optimum time, so that the temporary high-temperature tapping of the hot water immediately after the bath heating is stopped is reduced, and the temperature of the hot water fluctuates. So that a comfortable hot water supply can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bath kettle with hot water supply in one embodiment of the present invention.

FIG. 2 is a sequence diagram of the embodiment.

FIG. 3 is an operation diagram of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Heat transfer tube for hot water supply 3 Heat transfer tube for bath 4 Burner 6 Solenoid valve 7 Bypass water supply circuit 8 Mixing part 9 Control part 11 Circulation pump

Claims (1)

(57) [Claims] 1. A heat transfer tube for hot water supply sharing heat absorbing fins, a heat exchanger of two cans provided with a heat transfer tube for bath, a burner for heating the heat exchanger, and a bathtub for the heat transfer tube for bath. A circulation pump for circulating water, a bypass water supply circuit that connects between the inlet side and the outlet side of the hot water supply heat transfer tube, and a control device that controls opening and closing of the electromagnetic valve , The control unit operates from the simultaneous operation of hot water supply and bath heating.
When the heating operation is stopped, the circulation pump stops
Open the solenoid valve for a predetermined time from when the bath heating operation is stopped
A water heater with a bath kettle that suppresses the resulting rise in hot water temperature .