JPH0626704A - Temperature of 1-heater 2-passage hot water supplier - Google Patents

Abstract

PURPOSE:To ensure hot water supply without danger and highly effectual circulation by changing a temperature control set value for controlling a 1-heater 2-passage hot water supplier including a hot water supply circuit and a circuit such as a bath (additional burning function and heating function, etc.). CONSTITUTION:A flow rate sensor 5 is provided on the way to a water supply pipe 4 which is connected with a heater body 1 of a hot water supplier for detecting a water flow, and detected temperature by a temperature sensor 2 provided on the heater body 1 is inputted into a controller 6. A temperature control set value for the heater body 1 is converted to high and low values with a signal from the flow rate sensor 5, and during the operation of a hot water supply circuit A the temperature control set value is controlled to be low, and during the operation only of a circuit 13 the temperature control set value for the heater body 1 is controlled to be high. A heat exchange efficiency is improved and hence danger such as a burn is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water heater for a can of two water channels.
One of the water channels is provided with a circulation circuit connected to a bath tub, a heating radiator, etc., and the other water channel is provided with a hot water supply circuit used for hot water supply.

[0002]

2. Description of the Related Art A water heater is a one-channel type used exclusively for bath, cooking, washbasin, heating, etc., a hot water supply circuit A for bath, cooking, washbasin, and circulation pump for bath, radiator, etc. A one-can-two-channel type is known in which a circulation circuit B is provided for additional heating, heat retention, and heating by circulating and indirectly heating.

In any of the above methods, operation control is performed by providing one temperature sensor in the center of the can body. The temperature setting sensed by the temperature sensor can be changed manually, but the setting can be changed. It is always a constant value unless you do. Because of the positional relationship between the temperature of the part sensed by the temperature sensor and the hot water temperature, the hot water temperature is higher than the temperature of the sensing part when passing water, so the temperature set by the temperature sensor is always higher than the desired hot water temperature. It is controlled at a low level (about 70 ° C). Therefore, when the hot water supply circuit A is stopped and only the circulation circuit B is operated, the temperature of the hot water inside the can averages up and down, so the temperature of the circulation circuit B cannot exceed the set temperature (70 ° C) of the temperature sensor. there were.

[0004]

As for the hot water used for cooking and washing, the temperature of the hot water that comes out when the faucet is opened, but hot water near boiling water may cause burns. If controlled at about 70 ° C, the tap water temperature will be 80 ° C to 90 ° C.
It becomes about ℃. On the other hand, in order to efficiently exchange heat in the circulation circuit to the bath, etc., the sensed temperature of 70 ° C is too low, and in fact, a high temperature of about 80 ° C is convenient, and the temperature set value of the temperature sensor is reheated when hot water is supplied. We would like to make the change automatically when it is cycled.

[0005]

According to the present invention, a hot water supply circuit A and a circulation circuit B such as a bath are provided in a can body 1 of a water heater, and a temperature sensor 2 provided in the can body 1 controls a burner 3 of a burner 3. In a water heater with one can and two water channels installed for operation control, a flow sensor 5 is provided in the middle of the water supply pipe 4, and the temperature control set value of the temperature sensor 2 is changed by the water flow detection signal of the flow sensor 5. The temperature control method for 1 can 2 water passage water heater is used when hot water is being supplied (that is, when there is water flow).
Then, the temperature control set value is automatically changed when hot water is not supplied.

Further, the temperature set value of the temperature sensor 2 is changed by the controller 6 instructing the operation control so that the set value of the temperature sensor 2 is low when the flow sensor 5 detects the water flow and is high when the water flow is not detected. By designing the circuit so that there is no danger of hot water flowing out, the heat exchange efficiency is increased.

[0007]

The operation will be described. When the operation switch (not shown) is turned on to start the operation of the water heater, the hot water supply circuit A is heated by the burner 3, and the operation is continued up to the temperature control set value of the temperature sensor 2. Boil in hot water. When the faucet 7 at the end of the hot water supply circuit A is opened, hot water is supplied to the bathtub 8 and the like.

On the other hand, the bath 8 and the circulation circuit B are connected via a circulation pump 9 and indirectly heated by the hot water in the can body 1 to reheat and keep warm. If a radiator is provided instead of the bath 8 and is connected to the circulation circuit B, it is used for heating.

After the operation is started, the signal of the temperature sensor 2 provided in the can body 1 of the water heater is sent to the controller 6, and the burner 3 is intermittently operated so as to maintain a constant temperature. Then, when the hot water supply circuit A is used, the flow rate sensor 5 detects the flow of water and controls the temperature control set value to be low by the signal (eg, about 70 ° C.), and the optimum hot water supply temperature from the faucet 7 Change to (80-90 ° C).

When the flow sensor 5 stops detecting the flow of water by closing the faucet 7 after hot water supply is completed, the controller 6 changes the temperature control set value to a high value (eg, about 80 ° C.) by the signal of the flow sensor 5. The temperature of the hot water in the can 1 is raised to and maintained at the hot water discharge temperature (80 to 90 ° C.) level when the hot water supply circuit A is passed through. Therefore, when the circulation pump 9 is operated to use the circulation circuit B, heat is exchanged with the circulation circuit B at a higher hot water temperature than when the set temperature is not changed, and temperature control is performed so as to improve heat exchange efficiency. It is a thing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure will be described below with reference to the drawings showing an embodiment of a one-can two-channel hot water heater used for reheating a bath. Reference numeral 1 denotes a can body of a water heater, and a hot water supply circuit A is provided in the can body 1. , A can 2 water channel consisting of a circulation circuit B for reheating the bath. Reference numeral 2 denotes a temperature sensor provided in the middle of the can body 1 of the water heater, which can be quickly detected when cold water enters the can body 1 because it is close to the water supply inlet, and is controlled at a temperature lower than the hot water supply temperature.

Reference numeral 3 is a burner which is a heat source of the water heater, 4 is a water supply pipe for supplying water to the can body 1, 5 is a flow rate sensor provided in the middle of the water supply pipe 4, and 6 is a controller for controlling the operation of the burner 3, which is started. The burner 3 is continuously operated so that the temperature of the hot water in the can body 1 of the water heater becomes constant by the signal of the temperature sensor 2 while giving an appropriate instruction according to various conditions at the time of running, running and stopping. Further, it has a self-determination function of changing the temperature control set value of the can body 1 depending on whether or not the water flow sensor 5 senses the water flow, and when the hot water supply circuit A is used to detect the water flow, the set temperature is set low (eg; 70 ° C.), and high (eg, 80 ° C.) when water flow is stopped.

A faucet 7 is connected to the hot water supply circuit A via a hot water supply pipe 7a, and is provided in a bath or washroom. 8 is a bathtub for bathing, 9 is a circulation pump that circulates the hot water by connecting the circulation circuit B and the bath 8, and the hot water in the bath 8 is exchanged with the hot water in the can body 1 to reheat and keep warm. To serve. Reference numeral 10 is a pressure reducing valve that supplies water to the water supply pipe 4 by reducing the water pressure.

[0014]

According to the invention having the above-described structure and operation, the temperature control set value is changed depending on whether it is used for hot water supply or for a circulation circuit for reheating a bath. Detecting the water flow by the signal of is that the hot water supply is started by opening the faucet 7 for hot water supply, and the temperature is controlled to the same level as a conventional water heater, and when the faucet 7 is stopped, the temperature is controlled. Since the set value is increased, when the circulation circuit B is operated for reheating, etc., the speed of reheating and heat retention is accelerated, efficient heat exchange can be performed, and the circulation output of the bath etc. is greatly improved. is there.

When the flow sensor 5 does not detect a water flow, even if the temperature set by the temperature sensor 2 rises, the upper and lower hot water temperatures in the can 1 are averaged. Even if the hot water is opened and the hot water is opened, the hot water heated to the set temperature of 80 ° C. or higher does not come out, and there is no danger.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water heater showing a pipeline in which the present invention is applied to a bath reheating circuit.

[Explanation of symbols]

 1 Can body of water heater 2 Temperature sensor 3 Burner 4 Water supply pipe 5 Flow rate sensor 6 Controller A Hot water supply circuit B Circulation circuit

Claims (2)

[Claims] 1. A one-can-two-water channel in which a hot water supply circuit A and a circulation circuit B such as a bath are provided in a can body 1 of a water heater, and a temperature sensor 2 provided in the can body 1 controls the operation of a burner 3. In a water heater with a built-in water temperature sensor, a flow rate sensor 5 is provided in the middle of the water supply pipe 4, and the temperature sensor 2 is detected by the water flow detection signal of the flow rate sensor 5.
The method of controlling the temperature of the one-can-two-channel water heater is characterized by changing the temperature control set value of. 2. The temperature set value of the temperature sensor 2 is changed by the controller 6 instructing the operation control so that the set value of the temperature sensor 2 is low when the water flow sensor 5 detects the water flow and is high when the water flow is not detected. The method of controlling the temperature of a one-can-two-channel water heater according to claim 1, wherein the circuit is designed as follows.