JP2547143B2 - Water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus, and more particularly to a hot water supply apparatus which can be used in two modes, one having a remote controller and the other not having the remote controller.

[0002]

2. Description of the Related Art As a hot water supply device of a type which can be used in two modes, that is, a mode with a remote controller and a mode without a remote controller, for example, there is one shown in FIG. The figure shows the case where a remote control device is connected. From the upstream side of the water passage (1), the flow counter (2), the water temperature sensor (3), the heat exchanger (4) and the tap water tap (5). Are arranged in this order, and the flow counter (2) is
Measure the amount of water flowing through (1) per unit time. The flow rate counter (2) is electrically connected to the control device (6), and the control device (6) is further connected to a remote control operation device (7) for setting a tap water temperature. Further, the remote control operating device (7) has a temperature setting button (71) and an operation switch (7
2) is provided.

In the gas circuit (11), the main gas valve (1
3), the proportional valve (12) and the gas burner (10) are arranged in this order, and the original gas valve (13) is kept open in the normal state and closed in the non-energized state. It is composed of a solenoid valve. When the operation switch (72) is turned on after setting the hot water temperature with the temperature setting button (71) and the hot water tap (5) is further opened, the flow rate counter (2 ) Output from the control device (6) to the main gas valve (13), which causes the energizing signal to open and the gas burner (10) to open.
Ignite. Then, the hot water temperature set by the temperature setting button (71), the measured flow rate of the flow rate counter (2), and the temperature sensor
Control the combustion amount of the gas burner (10) while controlling the feed forward from the detected water temperature of (3), etc.
Hot water of the temperature set with the temperature setting button (71) is tapped
Take out from (5).

This device can be used without connecting the remote control operating device (7). If the remote control operation device (7) is not connected, the remote control operation device
Fixed temperature (eg 50 ° C) instead of the above set temperature of (7)
The hot water supply operation is executed in the same manner as in the case where the remote control operating device (7) is provided, except that is adopted. That is, the control device
The same control program as in the case where the remote control operating device (7) is provided is executed, except that the fixed temperature previously stored in the microcomputer of (6) is adopted. Then, in the case of a usage mode in which the remote control operation device (7) is not connected, the hot water temperature is adjusted by using a hot and cold water mixing tap as the hot water tap (5).

As described above, the hot water supply device has an advantage that it is not necessary to prepare the control device (6) of different types depending on the presence or absence of the remote control operating device (7). In the hot water supply device, when a power failure occurs during the hot water supply operation, the original gas valve (13) is de-energized and closed, and the combustion of the gas burner (10) is stopped. However, since the hot water tap (5) is still open and unheated water is being released, the main gas valve (13) is energized and opens when the power is restored at an unexpected time, and the gas burner (1
It is necessary to prevent abrupt combustion of (0) to ensure a safe condition. Therefore, the following measures may be taken.

That is, when it is determined that the hot water tap (5) is in the open state by checking whether the flow rate measured by the flow rate counter (2) is "0" after the power failure is restored, the gas burner (10) is extinguished. The safety confirmation subroutine to be maintained at is prepared in the control program, and after the power failure is restored, the safety confirmation subroutine is uniformly executed regardless of whether the remote control device (7) is connected or not. .

However, in this case, the remote control operating device
In the usage mode in which (7) is connected, the remote control operating device (7) and the microcomputer storing the operation signal of the operation switch (72) are naturally turned off after the power failure is recovered, so that the tap water faucet (5) is Even if it is in the open state, the main gas valve (13) is not energized, and although there is no concern that the gas burner (10) will suddenly burn, the tap gas faucet (5 ) Need to be cut off. That is, in the usage mode in which the remote control operating device (7) is connected, the remote control operating device is temporarily shut off after the hot water tap (5) is restored after the power failure is restored.
Operate the operation switch (72) of (7) and then tap the tap again.
If (5) is not opened, hot water cannot be taken out and the operation becomes complicated.

In the above, the opening / closing of the tap (5) is judged by the presence / absence of the output of the flow counter (2) for judging the flow in the water passage (1). Instead of), a water flow switch that turns ON / OFF depending on the presence / absence of water flow may be provided, and the ON / OFF signal of the water flow switch may be used to determine the open / closed state of the hot water tap (5) after a power failure recovery. In this case, when the hot water temperature sensor is arranged on the downstream side of the heat exchanger (4) and the hot water tap (5) is opened, feedback control is performed using the output of the hot water temperature sensor, and the gas burner (10) is used. Control the amount of combustion of and take out hot water at the set temperature.

The present invention has been made in view of the above points, and is provided with "a water flow detector such as a flow counter or a water flow switch for detecting the presence or absence of a water flow occurring in the water passage (1), and after a power failure is restored. Is a hot water supply device that can be used in both a usage mode in which a remote control operation device (7) of a type that enables a hot water supply operation after that is connected only when it is operated again and a usage mode in which it is not connected. It is an object of the present invention to prevent the gas burner (10) from suddenly burning at the time of re-energization after the power failure is restored and to easily perform the hot water supply operation after the power failure is restored.

[0010]

The technical means of the present invention for solving the above-mentioned problem is a remote controller which judges the presence or absence of a remote controller operating device (7) and outputs a remote controller no signal when the remote controller operating device (7) is not connected. Detecting means and an AND circuit that outputs an abnormal signal when receiving a remote control absence signal output by the remote control detecting means and a water flow detection signal output by the water flow detector, are provided. The gas burner (10) is kept in the combustion prohibited state while the signal is being output. ”

[0011]

The above technical means operates as follows. When the power failure that occurred during the hot water supply operation (when the hot water tap is open) is restored, the output of the remote control detection means is determined to determine whether or not the remote control operating device (7) is connected.
Also, the output of the water flow detector that checks the presence of water flow in the water passage (1) is judged to see if the inside of the water passage (1) is in a water-flowing state and the tap water faucet (5) is left open. Determine whether or not. And, the remote control operating device (7) is not connected (the remote control detection means outputs the remote control absence signal) and the water flow detector outputs the water flow detection signal (the tap water faucet (5) is in the open state). If it is determined to be), an abnormal signal is output from the AND circuit to which these signals are applied.

Then, while the abnormal signal is output from the AND circuit, the combustion of the gas burner (10) is maintained in a prohibited state, and after the abnormal signal disappears, the hot water supply control becomes possible. That is, according to the above technical means, when it is determined that the remote control operating device (7) is not connected and the tap water tap (5) is still open, the gas burner (10) is set to the combustion prohibited state. Therefore, the hot water supply operation is maintained.

Next, the operation after the recovery from the power failure will be described in detail according to the usage mode in which the remote control operation device (7) is connected and the usage mode in which the remote control operation device (7) is not connected. . In the case of the usage mode in which the remote control operating device (7) is connected. When the remote control operating device (7) is connected, the "remote control no signal" is output from the remote control detecting means when the power is restored.
Is not output, the abnormal signal is not output from the AND circuit that outputs the abnormal signal under the condition that the signal is generated. On the other hand, since the remote control operating device (7) returns to the initial state (state when the power supply is connected) when the power is restored, the hot water supply device will not come out unless the operation required for hot water supply operation is performed again by the remote control operating device (7). Not possible. That is, when the remote control operating device (7) is connected, the remote control operating device (7) is operated even if the tap water faucet (5) is open and the water flow detector outputs a water flow detection signal. Unless this is done, the gas burner (10) for hot water supply will not burn.

.. In the case of usage without connecting the remote controller (7) In the usage without connecting the remote controller (7), the remote controller detector outputs a "remote controller no signal" when the power is restored, and under such conditions the water flow detector When the water flow detection signal is output from the AND circuit, an abnormal signal is output from the AND circuit. When the abnormal signal is output, the gas burner (10) is kept in the combustion prohibited state, so in this state the hot water tap (5) is closed so that the water flow detector does not output the water flow detection signal. To Then, the abnormal signal from the AND circuit disappears and the hot water supply control is enabled. That is, once the hot water tap (5) is closed,
When (5) is opened, the hot water discharge operation starts, and the gas burner for hot water supply burns only at this time.

As described above, according to the above technical means, regardless of whether or not the remote controller operating device (7) is connected, the operation of the remote controller operating device (7) or the closing of the tap (5) Unless operated, the gas burner will not burn.

[0016]

[Effect] The present invention has the following unique effects. In the usage mode in which the remote control operation device (7) is connected, the remote control operation device
Unless the operation of (7) is performed, there is no concern that the gas burner will burn after a power failure is recovered, and in the usage mode in which the remote control operation device (7) is not connected, unless the hot water tap (5) is once closed, Since the gas burner does not burn suddenly, safety can be secured after a power failure is restored.

Further, in the usage mode in which the remote control operating device (7) is connected, the hot water supply operation is started only by re-operating the remote control operating device (7) even if the hot water tap (5) is open. Therefore, compared with the above-mentioned one in which the tapping operation does not start unless the tap tap (5) is opened again after closing the tap tap (5) and re-operating the remote control device (7).
The hot water operation after power failure is simplified.

[0018]

EXAMPLES Next, examples of the present invention described above will be explained.
When the present invention is applied to a hot water supply apparatus to which a remote control operation device is connected, a control circuit and the like are configured in the same manner as in FIG. 1 described above, and a flow rate counter (2 that measures the flow rate of the water passage (1) is used. ) (Corresponding to the water flow detector described in the above-mentioned technical means) has a specific configuration as follows.

A unit water amount measuring device (21) that outputs one pulse each time a unit water amount passes, a counter (22) that counts the number of pulses output by the unit water amount measuring device (21), and the counter ( It is composed of a register (23) for storing the output of (22). The output of the timer (24) that outputs a pulse every one second is applied to the clear terminal (221) of the counter (22) and the load terminal (231) of the register (23). The counter (22) is reset to "0" each time a pulse is output at 1 second intervals, and the counter (22) keeps the number of pulses of the unit water quantity measuring device (21) until the next 1 second elapses. measure. That is, the counter (22) outputs the flow rate passing through the water passage (1) in one second. Then, the counter (2
The flow rate output by 2) (flow rate per second) is re-stored in the register (23) every second according to the output of the timer (24).
As a result, the register (23) outputs the amount of water that has passed through the water passage (1) in one second, that is, the flow rate.

A control program having the contents shown in FIG. 2 is stored in the microcomputer incorporated in the control device (6), and the operation of the hot water supply device according to the embodiment of the present invention will be described below with reference to FIG. [In the case of usage in which the remote control device (7) is connected] (a). When the hot water supply device is connected to an electric outlet to supply electricity, it is determined whether or not the remote control operating device (7) is connected (see step of reference numeral (80)). (I). Next, when the remote control operating device (7) is connected, it is monitored that the operation switch (72) arranged in the remote control operating device (7) is turned on (step (81)). When the operation switch (72) is turned on, the set temperature set by the temperature setting button (71) of the remote control operating device (7) is stored in the microcomputer as a tap water temperature (T) (reference numeral (82)). See step). (C). Next, the flow rate measured by the flow rate counter (2) (flow rate per unit time) is monitored (see step of drawing code (83)), and the flow rate measured by the flow rate counter (2) is not "0" and the tap ( If the 5) is judged to have been opened, the original gas valve
Energize (13) and keep it open to keep the gas burner (1
0) (see step (84)). (D). Hot water temperature (T) read in the microcomputer in the step of the drawing code (82), water temperature of the water passage (1) detected by the temperature sensor (3), and further the heat exchanger (4) Based on the heat exchange efficiency, etc., the feed-forward control of the combustion amount of the gas burner (10) is performed so that the hot water at the tapping temperature (T) is boiled in the heat exchanger (4) (see the step of drawing code (85)). .
That is, in order that the hot water at the tapping temperature (T) is boiled in the heat exchanger (4), the gas circuit (1) to the gas burner (10)
The opening of the proportional valve (12) inserted in (1) is controlled. (E). During the hot water supply operation, the output of the flow rate counter (2) is continuously monitored (see the step (86) of the drawing), and when the measured flow rate of the flow rate counter (2) is "0", the tap water faucet (5 ) Is closed, the main gas valve (13) upstream of the proportional valve (12) is de-energized and closed to maintain the gas burner (10) in a fire extinguishing state ( Drawing code (8
See step 7)).

Now, while the hot water supply operation is being continued while monitoring whether or not the measured water amount of the flow rate counter (2) is "0", that is, the steps of the reference numerals (85) (86) are repeated. If a power failure occurs during the operation, the power supply to the control device (6) and the remote control operating device (7) is stopped. Therefore,
The power supply to the main gas valve (13) is also stopped and the gas burner (10) is put into a fire extinguishing state. At this time, the tap tap (5) remains open. Then, when the power failure is restored, the control device (6)
Also, the power supply to the remote control operating device (7) is restarted and the control operation starts again from the step of the drawing symbol (80), and the operating switch (72) of the remote control operating device (7) is turned on until the operating switch (7) is turned on. 72) Monitor the input. That is, after the power is restored, unless the operation switch (72) is turned on, the main gas valve (13) is not energized and the gas burner (10) is not ignited even if the hot water tap (5) is open ( Drawing number (84)
Step is not executed). This can prevent the risk of sudden combustion of the gas burner (10) when the power is restored.

In this embodiment, the remote controller operating device (7)
The function unit in the microcomputer that executes the step of the drawing symbol (80) for determining whether or not is connected corresponds to the remote control detection means described in the section of the technical means. [In the case of a usage mode in which the remote control device (7) is not connected] (a). If the remote control device (7) is not connected and the hot water supply device is connected to an electrical outlet to supply electricity, the step of drawing code (80) is performed and then a waiting time of 1 second is performed (drawing code (91 )), And then determine whether the measured water amount of the flow rate counter (2) (the amount of water that has passed through the water passage (1) in 1 second) is "0" (drawing code)
See step (92)). Then, when the amount of water measured by the flow rate counter (2) is not "0", that is, when the tap water faucet (5) is already open from the beginning when power is supplied to the control device (6), the tap water tap (5) Is closed and the amount of water measured by the flow counter (2) is monitored to "0". (I). On the other hand, when it is determined that the measured water amount of the flow rate counter (2) is "0" and the hot water tap (5) is closed when the step of the drawing code (92) is executed, the microcomputer RO
The outlet temperature (T) is the temperature of 50 ° C stored in M in advance.
(Refer to the step of the drawing code (93)), and then the hot water supply operation is performed in the same manner as in the case of the use mode having the remote control operation device (7) described above when the hot water tap (5) is opened. To do.

Then, when a power failure occurs during the hot water supply operation and then the power failure is restored, the step of the drawing code (80) is executed after the energization of the control device (6) is restarted, and then the drawing code
In step (91), a waiting time of 1 second is executed, and then a drawing code (92) for judging whether or not the measured flow rate of the flow rate counter (2) is "0" is executed. Then, when the hot water tap (5) is left open during the power outage, the hot water tap (5) is closed and the flow counter (2) is closed because the measured flow rate of the flow rate counter (2) is not "0". The output of the flow rate counter (2) is monitored until the measured flow rate of 2) becomes "0". That is, when the hot water tap (5) is already open after the power failure is restored, the hot water supply operation does not start until the hot water tap (5) is once closed (the original gas valve (13) is energized to open the valve). The gas burner (10) cannot be burnt). As a result, it is possible to ensure safety at the time of power failure recovery in the case of the usage mode in which the remote control operation device (7) is not connected. Further, in this embodiment, it is confirmed whether or not the remote control operating device is connected (see step of drawing code (80)) and further the operation of monitoring the output of the flow rate counter (2) (step of drawing code (92)). The functional unit in the microcomputer to be executed corresponds to the AND circuit described in the section of technical means.

In the above embodiment, the opening / closing of the hot water tap (5) is judged depending on whether or not the measured flow rate of the flow rate counter (2) is "0". However, instead of the flow rate counter (2), A water flow switch that turns ON / OFF depending on the existence may be adopted. Also, while monitoring the output of the flow rate counter (2) until the measured current of the flow rate counter (2) becomes "0" (when executing the step of the reference numeral (92)), the remote control Drawing for judging whether or not the operating device (7) is connected (see step of drawing code (80)) and waiting for one second when it is judged that the remote control operating device (7) is connected You may make it perform the step of code | symbol (81).

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply device.

FIG. 2 is a flowchart showing the control operation of the embodiment of the present invention.

[Explanation of symbols] (1) ・ ・ ・ Water passage (7) ・ ・ ・ Remote control device (10) ・ ・ ・ Gas burner (72) ・ ・ ・ Run switch

Claims (1)

(57) [Claims] 1. A water flow detector such as a flow counter or a water flow switch for detecting the presence or absence of a water flow generated in the water passage (1) is provided, and the hot water supply operation after that can be performed only after a new operation after the power failure is restored. The presence or absence of the remote control operation device (7) is determined in the hot water supply device which can be used in both usage modes in which the remote control operation device (7) of When the remote control operating device (7) is not connected, a remote control detection means for outputting a remote control absence signal, and an abnormality when receiving a remote control absence signal output by the remote control detection means and a water flow detection signal output by the water flow detector An AND circuit that outputs a signal is provided, and when reenergizing after the power failure is restored, the gas burner (10) is maintained in the combustion prohibited state while the abnormal signal is output from the AND circuit. .