JP2564966B2 - Control method of hot water heater for both hot water supply and heating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a one-can / two-water channel water heater, one system for hot water heating in conjunction with a radiator, and one system for both hot and cold water supply used for hot water supply. It concerns a water heater.

[Prior Art] For general household water heaters, there is a single-channel type that is used exclusively for baths, cooking, washbasins, heating, etc., and for hot water used for baths, cooking, washbasins, etc. Known is a one-can / two-fluid type in which one heater body is used for heating and one heater body is used. In either case, temperature control is performed by one temperature sensor.

And the signal of the temperature sensor is output to the controller,
By the operation control of the controller, the burner performs the change of the combustion amount and the interruption / continuation operation, and the operation control is performed so that the temperature of the hot water exiting the heat exchange section is maintained within a preset temperature range.

For water heaters, it is preferred that the temperature variation of the hot water coming out of the faucet is narrow, and that the hot water temperature is stable is welcomed. For this reason, it is necessary to reduce the temperature control width of the hot water obtained in the heat exchange section, and for hot water supply, the temperature control width is usually set to 2 ° C. or less.

On the other hand, when using hot water heating, the hot water obtained in the heat exchange section for hot water heating is radiated and circulated by the radiator, and since hot water is not used directly, there is no particular need for temperature control width, In the 1-can 2-drain type that uses the temperature sensor, the temperature is controlled using the controller with the temperature control width suitable for the heat exchange part for hot water supply.

[Problems to be Solved by the Invention] In order to stabilize the hot water temperature by reducing the variation of the hot water temperature when supplying hot water from a faucet or the like, it is necessary to reduce the temperature control width of the hot water obtained in the heat exchange unit. Therefore, not only the combustion amount of the burner of the hot water heater is changed, but also the burner step and continuous operation are frequently repeated.

Since a burner is accompanied by incomplete combustion at the start of combustion or extinguishing a fire, it may develop into ignition noise and odors due to incomplete combustion, and may cause a decrease in thermal efficiency.
In the case of hot water supply such as a faucet, it is rare that the hot water is supplied for a long time, and this is not a big problem.

However, in the case of hot water heating, in most cases the operation continues for a long time, and moreover, when the room temperature to be heated becomes stable, the required amount of heat generation decreases, and the burner frequently interrupts and continues combustion. Since it will be repeated, the ignition noise, the odor due to incomplete combustion, and the decrease in thermal efficiency are serious problems.

[Means for Solving the Problems] The present invention is to solve the above-mentioned problems when performing hot water heating in a water heater with one can and two water channels. Hot water connected to a radiator 9 in the can body 1 of the water heater. Heat exchange part A for heating and faucet 7
And a temperature sensor 2 installed in the hot water supply heat exchange section B of the water heater can body 1, and a burner 3 is operated by a signal from the temperature sensor 2. Hot water supply for 1-can 2-drain with controller 4 that controls
In the water heater for both heating and heating, a flow rate switch 6 is provided in the hot water supply circuit 5 or the hot water supply circuit 5a connected to the hot water supply heat exchange section B, and the controller 4 is configured to have an off temperature and an on temperature based on a signal from the temperature sensor 2. Two kinds of temperature control widths are set, and the two kinds of temperature control widths of the controller 4 are selectively switched by a water flow presence signal of the flow rate switch 6, and the temperature control width is reduced when the flow rate switch 6 detects the flow rate. The present invention relates to a method for controlling a hot water supply / heating and hot water supply device.

[Operation] A hot water supply heat exchange section B and a hot water heating heat exchange section A are provided in the water heater can body 1 of the hot water supply / heating water heater, and the hot water in the hot water supply heat exchange section B is used for hot water heating heat exchange. Part A is heated. One hot water temperature detecting temperature sensor 2 is attached to the hot water supply heat exchange section B, and the controller 4 controls the burner 3 by this temperature signal, and the temperature sensor 2 detects a preset temperature control width. The burner 3 is disconnected and continuously operated so as to maintain the output, and the hot water in the hot water supply heat exchange section B is boiled to the set temperature.

Then, by opening the faucet 7, hot water can be used at various places, while the antifreezing liquid or the like that has been heated by passing through the hot water heating heat exchange section A is sent to the radiator 9 to heat the room.

Since the controller 4 of the present invention has a control function of selecting two types of temperature control widths, when the flow rate switch 6 detects the flow of water, it is determined that hot water is flowing to the faucet 7 and The control width is controlled small,
On the other hand, when the flow rate switch 6 does not detect the water flow, it is determined that the heating is being performed, and the temperature control width is largely controlled. Therefore, the burner 3 during heating, which is operated for a long time,
Due to intermittent operation with large intervals, the amount of odor generated due to incomplete combustion of ignition noise was significantly reduced.

[Embodiment] The configuration will be described below with reference to the drawings showing an embodiment. Reference numeral 1 denotes a water heater can body. In the water heater can body 1, a hot water heating heat exchange section A and a hot water heat exchange section B are provided. The two water channels are formed, and a coiled hot water heating heat exchange section A is formed in the hot water storage type hot water supply heat exchange section B.

Reference numeral 2 denotes a temperature sensor provided at an appropriate position in the hot water supply heat exchange section B of the water heater can 1, 3 is a burner for heating the hot water supply heat exchange section B of the water heater can 1, and 4 is control of the operation of the burner 3. The controller 4 is a controller that disconnects and continuously operates the burner 3 so that the hot water temperature of the hot water supply heat exchanging portion B in the hot water heater can 1 becomes constant in response to a signal from the temperature sensor 2.

5 is a water supply circuit for supplying water to the hot water supply heat exchange part B of the water heater can body 1, and 5a is also the hot water supply heat exchange part B of the water heater can body 1.
A hot water supply circuit for extracting hot water from the hot water supply device, and a faucet 7 provided at the end of the hot water supply circuit 5a. When the faucet 7 is opened, the hot water heated to a high temperature in the hot water supply heat exchange section B can be supplied.

8 is a circulation pump for circulating a heat medium such as water or antifreeze enclosed in the hot water heating heat exchange section A, and 9 is a heater for radiating the amount of heat given to the heat medium heated in the hot water heating heat exchange section A for heating. It is a radiator for use in.

Reference numeral 6 denotes a flow rate switch provided in the middle of the water supply circuit 5 or the hot water supply circuit 5a. When the faucet 7 is opened and hot water is used, the flow of water is detected and a water flow signal is sent to the control 4.

Further, the controller of the present invention has a burner 3 which is burning.
With respect to the off temperature (set temperature) that instructs the stop of No. 2, two types of on temperatures at which the combustion of the burner 3 starts again are provided, and two types of temperature control widths can be selected. And
When the flow rate switch 6 is detecting the flow of water, a mode with a small temperature control width is selected, and the burner 3 is frequently disconnected / continuously operated to reduce variations in hot water supply temperature.

That is, the operation of the present invention will be described with reference to the flow chart of FIG. 2. When the operation switch is turned on and the water heater is in operation, the temperature sensor 2 is read and it is compared whether or not the preset off temperature of the burner 3 is reached. Then, when the burner 3 is below the OFF temperature, the operation of the burner 3 is instructed, and the determination of the state of the operation switch and the reading of the temperature sensor 2 are repeated again.

If the temperature sensor 2 exceeds the OFF temperature of the burner 3 while the burner 3 is operating, the temperature control range is large, that is, a temperature lower than the set OFF temperature, for example, -20 ° C is set and the flow rate switch 6 is set. Read the data. When the flow rate is detected, it is determined that hot water is being supplied from the faucet 7, and the temperature control width is changed and set to a small temperature, for example, -2 ° C.

When the read data of the flow rate switch 6 indicates that there is no flow rate, the state of the circulation pump 8 is determined, and if it is in operation, it is determined to be heating operation and the set state with a wide temperature control range is maintained.

Further, when the circulation pump 8 is not operating, it is the time when neither hot water supply nor heating is being performed, the burner 3 is instructed to stop the operation, and the process returns to the initial determination of the state of the operation switch. In the determination of the state of the operation switch, when the operation switch is off, the burner 3 is instructed to stop the operation and the operation of the operation switch is returned to the initial determination of the operation switch to keep the operation stopped.

Next, in the operation during hot water supply or heating, the temperature sensor 2 is first read and compared with the on temperature of the burner 3. If the temperature of the temperature sensor 2 is higher than the on temperature of the burner 3, the burner 3 is turned on. 3 is instructed to stop the operation, the operation is repeated from the reading of the temperature sensor 2, and the operation stop is maintained. Then, when the temperature of the temperature sensor 2 becomes lower than the ON temperature of the burner 3, the process returns to the first judgment of the state of the operation switch, and naturally the detected temperature of the temperature sensor 2 is lower than the OFF temperature of the burner 3. , The burner 3 starts operation.

[Advantages of the Invention] In the present invention having the above-mentioned configuration and operation, the temperature control range is switched between the case of using for hot water supply and the case of using for hot water heating. Immediately after the temperature dropped, the burner 3 started to operate, and the temperature control range was narrow, so the temperature of the hot water was stable, and the operation suitable for use in a shower or the like became possible.

On the other hand, when it is used for hot water heating, the indoor air passing through the radiator 9 is warmed, so that temperature fluctuations of the heat medium supplied do not sensitively affect the temperature control range, such as when hot water is supplied. You don't have to. In the present invention, the hot water supply is determined based on the detection data of the flow rate sensor 2, and the temperature control width is greatly changed during hot water heating. Therefore,
The interval between when the burner 3 starts operating again after the temperature reaches the set temperature once becomes longer, and the jarring ignition noise that occurs when the burner 3 is disconnected and continued, and the generation of odors during ignition and extinguishing is reduced. , The continuous living for a long time did not deteriorate the living environment.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a piping path of a water heater according to the present invention. FIG. 2 is a flowchart showing the operating state. A: Heat exchange part for hot water heating, B ... Heat exchange part for hot water supply 1 ... Can body of water heater, 2 ... Temperature sensor, 3 ... Burner,
4 ... Controller 5 ... Water supply circuit, 5a ... Hot water supply circuit, 6 ... Flow switch, 7 ... Faucet 8 ... Circulation pump, 9 ... Radiator

Claims (1)

(57) [Claims] 1. A hot water heating heat exchange section A connected to a radiator 9 in a water heater can body 1, a hot water heat exchange section B connected to the faucet 7 and provided in the hot water exchange section A, and hot water supply. In a water heater for both hot and cold water supply of one can and two water channels, which is provided with a temperature sensor 2 installed in the hot water heat exchange section B of the machine can body 1 and a controller 4 for controlling the operation of the burner 3 by the signal of the temperature sensor 2. The hot water supply circuit 5 or the hot water supply circuit 5a connected to the hot water supply heat exchange section B is provided with a flow rate switch 6, and the controller 4 has a temperature control width of 2 based on a signal from the temperature sensor 2 and is constituted by an off temperature and an on temperature. The hot water supply is characterized in that two types of temperature control widths of the controller 4 are set and selectively changed by a water flow presence signal of the flow rate switch 6, and the temperature control width is reduced when the flow rate switch 6 detects the flow rate.・ Heating and water heater Control method.