JP2882160B2 - 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 pipe configuration of a heat exchanger of a water heater with a bath kettle.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for hot water heaters with bath kettles so that high-temperature water does not come out of a bath tub from a bath circulation circuit during hot water supply.

[0003] A conventional water heater with a bath kettle will be described below. In general, in the instant-type hot water heater with 1 kettle and 2 water channels, the heat transfer tube on the bath side is empty during the hot water supply operation, the hot water remaining in the heat transfer tube for the bath becomes high temperature, and the equipment is durable in use. Above all is inconvenient. In order to reduce the temperature rise from the heat transfer tube for the bath, the temperature of the hot water supply is set lower to reduce the temperature rise in the heat transfer tube for the bath, or the heat transfer area of the heat transfer tube for the heat transfer tube for the bath is reduced. By increasing the heat transfer area of the heat pipe, the temperature rise in the bath heat transfer pipe was reduced.

[0004]

However, in the above-mentioned conventional configuration, if the outlet temperature setting of the hot water supply temperature is lowered,
High temperature hot water cannot be obtained and the hot water temperature does not become satisfactory in use.If the heat transfer area of the heat transfer tube is larger than the heat transfer area of the bath tube, satisfactory performance is obtained during hot water supply operation. However, during the bath operation, the heat transfer tube for hot water supply becomes empty, causing a problem that the temperature becomes high and a comfortable performance cannot be obtained.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a water heater with a bath kettle in which a rise in temperature of a circulation circuit on a bath side during a hot water supply operation is reduced.

[0006]

In order to achieve this object, a water heater with a bath kettle according to the present invention is provided with a bath outlet at a hot water supply inlet side of a heat exchanger and a bath inlet at a hot water outlet side. It has a configuration in which the flow of hot water and the flow toward the bath face each other.

[0007]

In this configuration, the heat transfer tube for the bath during the hot water supply operation is in a water stop state, the remaining hot water in the bath heat transfer tube becomes high temperature and expands, and starts to flow backward to the bath circulation circuit, but the inlet of the heat transfer tube for the hot water supply is started. As the bath gets closer to the side, the bath heat transfer tube is cooled, thereby preventing the temperature of the bath circulation circuit from rising.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a heat exchanger 1 having a two-channel water passage having a heat transfer tube 4 for hot water supply and a heat transfer tube 5 for bath is provided above a burner 8, and the heat of combustion of the burner 8 is used to supply hot water and bath water 1.
3 is heated. The hot water supply heat transfer tube 4 and the bath heat transfer tube 5 of the heat exchanger 1 are brazed together with the heat absorbing fins 3. Further, around the combustion chamber drum 2, the hot water supply drum cooling pipe 6 and the bath drum cooling pipe 7 are in contact with each other, and the combustion chamber drum 2, the hot water supply drum cooling pipe 6, and the bath drum cooling pipe 7 are provided. They are brazed together and cool the combustion chamber drum 2. The bath circulation circuit 11 circulates and heats the bath water 13 through a circulation pump 12, a check valve 14, a heat transfer tube 5 for a bath, and a drum cooling tube 7 for a bath. The hot water supply circuit 15 is connected to a flow rate sensor 9 for detecting the flow rate of the water supply, a heat transfer pipe 4 for the hot water supply, a drum cooling pipe 6 for the hot water supply, and a hot water supply temperature thermistor 10 for detecting the tap water temperature.

The operation of the water heater with a bath kettle configured as described above will be described with reference to FIG. First, when the tapping is started, the flow sensor 9 detects, and the combustion of the burner 8 is started, and the amount of combustion is adjusted so as to reach a preset tapping temperature. At this time, the water in the bath circulation circuit 11 is in a water-stop state, or an abnormally low circulation flow rate, that is,
When the bath operation is stopped or at the time of failure, the bath heat transfer tube 5 absorbs heat of combustion from the common heat absorbing fins 3 and becomes high temperature.
Partially discharged to the hot water supply heat transfer tube 4. However, since the temperature of the heat transfer tube 5 for the bath is higher than that of the heat transfer tube 4 for hot water supply, the bath water 13 in the heat transfer tube 5 for the bath expands, and the high-temperature water A flows out of the heat transfer tube 5 for the bath. At this time, since the check valve 14 is provided at the bath circulation path inlet 11b, the high-temperature water A flows to the bath circulation path outlet side 11a. The high-temperature water B flowing into the bath drum cooling pipe 7 is cooled by the hot-water drum cooling pipe 6 (the pipe is hardly receiving the heat of the burner 8 and thus has a low temperature close to the temperature of the water supply), and heat exchange is performed. Warm water C from vessel 1
Get out as The temperature of A, B, C of the bath circulation circuit 11 is
A = 99 ° C., B = 90-70 ° C., and C = 65 ° C.

As described above, according to the present embodiment, during the hot water supply operation, before the high-temperature water in the bath heat transfer tube 5 flows into the bath circulation circuit 11, it is cooled by the bath drum cooling tube 7, and the bath circulation circuit 11 is cooled. This can adversely affect the components and the like, and prevent the risk of high-temperature water flowing into the hot water tank.

[0012]

As is apparent from the above description of the embodiment, in the present invention, the hot water in the bath heat transfer tube is cooled by the bath drum cooling tube during the hot water supply operation before flowing into the bath circulation circuit. Therefore, it is possible to realize a highly safe and excellent water heater with a bath kettle that can prevent a rise in the temperature of the bath circulation circuit and prevent the danger of hot water from flowing into the bathtub.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a water heater with a bath in one embodiment of the present invention.

FIG. 2 is a circuit diagram of the heat exchanger section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Combustion drum 3 Heat absorption fin 4 Heat transfer pipe for hot water supply 5 Heat transfer pipe for bath 6 Drum cooling pipe for hot water supply 7 Drum cooling pipe for bath 11 Bath circulation circuit

Claims (1)

(57) [Claims] In a heat exchanger of a single-chamber two-channel water-cooling system comprising a heat transfer tube for a hot water supply and a heat transfer tube for a bath which share a combustion chamber drum and heat absorbing fins, the heat transfer pipe for hot water supply is provided around the combustion chamber drum. A bath in which a hot-water supply drum cooling pipe connected to a heat pipe and a bath-drum cooling pipe connected to the bath heat transfer pipe are in contact with and joined to each other so that water flows in a bath circulation circuit and a hot-water supply circuit. Water heater with kettle.