JP2000002462A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of lowering a running cost by suppressing consumed power to a minimum value upon control of a heat retaining combustion. SOLUTION: A hot water supply device comprises a heat exchanger 2 for heating water from a water inlet passage 5 under the combustion of a burner 3 and supplying hot water, a control means H for controlling the combustion of the burner 3 an operation command means 16 for switching a hot water supply operation state to a hot water supply stopping state, and a heat retaining operation command means HS for commanding the execution of a heat retaining the operation. While the hot water supply operation state is commanded by the operation command means 16, the control means H controls the combustion of the burner 3 to perform an ordinary combustion control and performs a heat retaining combustion control by controlling the combustion of the burner 3. While the hot water supply operation stopping state is commanded by the operation command means 16, when the execution of the heat retaining operation is commanded by the heat retaining operation command means HS, the control means H performs the heat retaining combustion control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heat exchanger for heating water supplied through an inlet channel by burning a burner and discharging the hot water to a tapping channel, and control means for controlling the combustion of the burner. An operation commanding means for instructing a switch between a hot-water supply operation state and a hot-water supply operation stop state, and a warming operation commanding means for instructing execution of a warming operation, and the control means includes:
In the state where the tapping operation state is instructed by the operation command means, the normal combustion control for controlling the combustion of the burner for tapping operation with the passage of water through the heat exchanger. And, in response to execution of the heat retaining operation by the heat retaining operation command means in the water stop state in which water is not supplied to the heat exchanger, control the combustion of the burner for the heat retaining operation. The present invention relates to a hot water supply device configured to execute warming combustion control.

[0002]

2. Description of the Related Art Conventionally, in such a water heater,
If the hot water operation state is not commanded by the operation command means,
Even if the execution of the warming operation is instructed by the warming operation instructing means, the warming operation control is not executed (for example, see JP-A-10-26410).

[0003]

Therefore, according to the conventional hot water supply apparatus, if it is desired to perform the heat retention combustion control in advance before the execution of the normal combustion control, and to keep the temperature of the hot water in the hot water path or the heat exchanger, It is necessary to always switch the control means to the hot water operation state by the operation command means, and therefore, although the normal combustion control is not performed, for example, the normal combustion control such as a hot water temperature thermistor for detecting the hot water temperature is performed. There is a disadvantage that power is supplied to sensors and the like that are required only during execution, and power is also supplied to display functions and the like such as an operation lamp, so that power is consumed more than necessary. .

Accordingly, the present invention focuses on such a conventional problem, and an object of the present invention is to minimize the power consumption when executing the insulated combustion control, thereby reducing the running cost. Another object of the present invention is to provide a hot water supply device capable of reducing the amount of hot water.

[0005]

In order to achieve this object, according to the first aspect of the present invention, the control means for controlling the combustion of the burner is instructed by the operation command means to instruct the stoppage of the tapping operation. In this state, the warming operation control unit executes the warming combustion control as the warming operation instruction is issued by the warming operation instruction means. In other words, even when the control means is in the hot-water supply operation stopped state, when the execution of the heat retention operation is instructed by the heat retention operation command means, the heat retention combustion control is executed.
Insulation combustion control can be executed in a state where power supply to sensors and display functions required only when executing normal combustion control is cut off, and power consumption required for execution of insulation combustion control is required. The running cost can be reduced by minimizing it.

According to the second aspect of the present invention, when the execution of the warming operation is instructed by the warming operation instructing means in the state where the tapping operation stop state is instructed by the operation instructing means, In addition, since the configuration is such that the warming combustion control is executed when the water flow is stopped, and the warming combustion control is not executed when the water flow is in a state, the execution of the warming operation is instructed by the warming operation command means. However, when the water is passed to the heat exchanger, the insulated combustion control is not performed, and waste due to unnecessary insulated combustion control is reliably prevented.

According to the third aspect of the present invention, the control means sets the time during which the heat-retention combustion control can be executed between the time when the heat-retention operation instruction is issued by the heat-retention operation instruction means and the set time. Therefore, even if the execution of the insulated combustion control is instructed by the insulated operation command means, the insulated combustion control is executed only for a preset time, and when the set time has elapsed, the insulated combustion control is performed. Therefore, even if, for example, the execution stop command of the insulated combustion control is forgotten, the insulated combustion control is not executed for a long time, and a wasteful increase in running cost can be suppressed. .

According to the fourth aspect of the present invention, there is provided a time zone setting means for setting a time zone of the warm combustion, and the control means sets the time zone set by the time zone setting means to:
Since the configuration is such that the time during which the warming combustion control can be performed is set, the time period during which the warming combustion control is performed can be freely set and used conveniently.

According to a fifth aspect of the present invention, there is provided an operating device including an operation commanding device and a warm combustion commanding device, and the control device is switched to the operating state by the operation commanding device. Power-operated operation display means for displaying warm-up operation, power-operated warm-up combustion display means for displaying that the execution of warm-up combustion control has been instructed by the warm-up combustion command means, and the burner is burning for warm-up combustion control. Power-operated burner combustion indicating means for indicating that Therefore, that the control means is switched to the operating state, that the warm combustion control is being performed,
And, in a state where the user can easily recognize that the burner is burning, the control means is switched to the operation stop state by the operation command means, and the power supply to the operation display means is cut off. The warm combustion control can be executed, and the power consumption required for executing the warm combustion control can be minimized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water supply apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the hot water supply apparatus includes a hot water supply unit K for heating supplied water to supply hot water to the tap 7a, a control unit H as control means for controlling the operation of the hot water supply unit K, A remote control operation unit R as an operation device for instructing the H to give operation information is provided.

The hot water supply unit K comprises a heat exchanger 2 for water heating provided in the combustion chamber 1, a gas combustion type burner 3 for heating the heat exchanger 2, and the like.
There is also provided a fan 4 through which the combustion air is passed from the upstream side and whose ventilation amount can be changed and adjusted. The heat exchanger 2 has a water inlet 5 to which water is supplied from, for example, a household water supply, and a hot water supply 6 for supplying hot and cold water.
Are connected to each other, and a bypass 21 that connects the water inlet 5 and the hot water supply 6 in a state of bypassing the heat exchanger 2 is provided, and the hot water from the hot water supply 6 and the water from the bypass 21 are mixed and manually operated. A hot water tap 7 for tapping the hot water tap 7a is connected to the hot water supply path 6 and the bypass 21.

The hot water supply path 6, the hot water supply path 7, and the bypass path 2
The hot water from the hot water supply channel 6 and the bypass 2
A mixing valve 22 is provided for mixing water from 1 at a constant mixing ratio and supplying the mixed water to the tapping path 7. The water inlet channel 5 is provided with a water flow sensor 8 for detecting the amount of water flowing to the heat exchanger 2 and an inlet water temperature thermistor 9 for detecting the temperature of water supplied through the water inlet channel 5. A tap water temperature thermistor 10 for detecting the temperature of tap water discharged from tap tap 7a is provided, and a tap temperature thermistor 23 for detecting the temperature of tap water in heat exchanger 2 is also provided.

The fuel supply passage 11 for the burner 3 is provided with an electromagnetically operated on-off valve 12 for intermitting fuel supply, and an electromagnetically operated gas amount control valve 13 which is capable of changing and adjusting a fuel supply amount (burning amount of the burner 3). In the vicinity of the burner 3, an igniter 14 for executing an ignition operation for the burner 3 and a frame rod 15 for detecting whether or not the burner 3 is ignited are provided, respectively.

The remote control operation unit R includes an operation switch 16 as operation command means for instructing start / stop of operation of the hot water supply unit K, a temperature setting switch 17 capable of changing and setting a target temperature for hot water supply, and execution of a warming operation. The warming switch HS as a warming operation command means for instructing and the operation switch 16 are turned on.
In the operating state, a display section 18 for displaying and operating a hot water temperature and a target temperature for hot water supply, an operation lamp 19 as power-operated operation display means for displaying that the hot water supply section K is in an operating state, and a burner 3. A combustion lamp 20 as power-operated burner combustion display means for displaying that the fuel cell is in a combustion state, a warming lamp 24 as power-operated warm combustion display means for displaying that warm-burn control is being performed, and the like. It is configured.

The control unit H includes a microcomputer, and includes a normal combustion control unit 100 for executing normal combustion control during tapping and a warming combustion control unit 101 for executing warming combustion control during tapping standby. It is provided in the form of a control program.

When the operation switch 16 is turned on and the tapping operation state is instructed, the normal combustion control means 100 controls the combustion of the burner 3 as the water flow to the heat exchanger 2 is started. When started, control is performed so as to stop the combustion of the burner 3 as the flow of water to the heat exchanger 2 is stopped. Is configured to execute normal combustion control for adjusting the combustion amount of the burner 3 so as to reach the target temperature for hot water.

More specifically, after the hot water supply operation state is set in accordance with the ON operation of the operation switch 16, the water flow rate detected by the water flow rate sensor 8 in response to the opening operation of the hot water tap 7a is equal to the set water flow rate. Is exceeded, the ventilation operation by the fan 4 is started, and the intermittent valve 12 is opened to open and adjust the gas amount control valve 13 to the ignition gas amount, and the igniter 14 ignites the burner 3. Then, it is confirmed by the frame rod 15.

Thereafter, based on the detected information of the incoming water temperature thermistor 9, the outgoing water temperature thermistor 10 and the flow rate sensor 8, and the information of the outgoing water target temperature Ts set by the temperature setting switch 17, the outgoing water temperature is determined. The amount of combustion of the burner 3 required to set the target temperature Ts for tapping is calculated. Then, while adjusting and controlling the gas amount adjusting valve 13 so that the gas amount corresponds to the obtained combustion amount, the ventilation of the fan 4 is adjusted so that the ventilation amount of the fan 4 becomes a proper combustion state with respect to the adjusted gas amount. The feedforward control for adjusting and controlling the amount is performed, and further, the feedback control for finely adjusting the opening of the gas amount adjusting valve 13 is performed so that the detected temperature of the tapping temperature thermistor 10 becomes the tapping target temperature Ts. In this way, part of the water from the water inlet channel 5 is heated by the heat exchanger 2 and
From the hot water tap 7a and the hot water target temperature T
s of hot water will be discharged.

The insulated combustion control means 101 is provided with an insulated switch H regardless of whether the operation switch 16 is ON or OFF.
When S is turned on and the execution of the warming operation is instructed, until the set time for manual warming combustion elapses,
When the set conditions for manual warming combustion start are met,
When the preservation combustion of the burner 3 is started and the setting condition for stopping the preservation combustion manually is satisfied, the preservation combustion control for manual operation for stopping the preservation combustion of the burner 3 is performed. In the state where the hot water supply operation state is commanded while the operation switch 16 is kept ON, if the water supply is stopped, the warming combustion of the burner 3 is started when the set condition for starting the normal warming combustion is satisfied. , When the set condition for stopping the normal warm combustion is satisfied,
The normal warm combustion control for stopping the warm combustion of the burner 3 is executed.

More specifically, in the annual warming combustion control, when the warming switch HS is turned on regardless of whether the operation switch 16 is ON or OFF, the manual warming combustion is performed after the warming switch HS is turned on. If the detected temperature of the hot water thermistor 23 becomes equal to or lower than the manual lower limit set temperature before the set time for the temperature elapses, it is determined that the set condition for the manual warming combustion start is satisfied, and the intermittent valve 12 and the gas amount are set. When the control valve 13 is opened to start combustion of the burner 3 and the detected temperature of the hot water thermistor 23 becomes higher than the manual upper limit set temperature, it is determined that the set condition for stopping the manual warming combustion is satisfied, and the intermittent valve is opened. The combustion of the burner 3 is stopped by closing the valve 12 and the gas control valve 13. Further, in the normal warm-up combustion control, in the water stop state after the normal combustion control is executed, the detected temperature of the hot water temperature thermistor 23 becomes equal to or lower than the normal lower limit set temperature while the operation switch 16 is kept ON. Then, it is determined that the set condition for the normal warm combustion start is satisfied, the intermittent valve 12 and the gas amount adjusting valve 13 are opened to start the combustion of the burner 3, and the detected temperature of the hot water temperature thermistor 23 becomes the normal upper limit. When the temperature becomes equal to or higher than the set temperature, it is determined that the set condition for stopping the normal warm combustion is satisfied, and the intermittent valve 12 and the gas amount adjusting valve 13 are closed to stop the burner 3 from burning.

Further, sensors such as the flow rate sensor 8 and the like,
The power supply to the display functions such as the display unit 18 will be described. When the operation switch 16 is turned on, the flow rate sensor 8, the incoming water temperature thermistor 9, the hot water temperature thermistor 23,
The power is supplied to all the sensors such as the hot water temperature thermistor 10, the display unit 18 of the remote control operation unit R, the operation lamp 19, and the like.
When the heat retention switch HS is turned ON, sensors of the incoming water temperature thermistor 9 and the outgoing water temperature thermistor 10 and the display unit 1
The power to the display functions of the operation lamp 8 and the operation lamp 19 is turned off, and the power is supplied to the water flow rate sensor 8, the hot water temperature thermistor 23, and the heat retention lamp 24.

In this way, the operation switch 16 is turned on.
In a state in which power to the display unit 18 and the display functions of the operation lamp 19 and the like according to the operation is cut off, the warming combustion control can be executed by turning on the warming switch HS. Power consumption can be reduced to a necessary minimum, thereby reducing running costs.

Next, the control operation of the control unit H will be described with reference to FIG.
A description will be given based on the flowchart of FIG. First, when the power is turned on, the operation switch 16 is turned on to supply electric power to all the sensors, the operation lamp 19 is turned on to perform the display operation of the display unit 18, and then the hot water tap 7a is opened. Accordingly, when the detection value of the water flow rate sensor 8 exceeds the set water flow and water flow (water flow) to the heat exchanger 2 is detected, normal combustion control is executed and the heat retention flag is turned on (step 1).
4).

That is, the burner 3 is ignited and the burner 3
When the ignition of the burner 3 is confirmed by the flame rod 15, the combustion amount of the burner 3 and the fan 4 are adjusted so that the tapping temperature detected by the tapping temperature thermistor 10 becomes the tapping target temperature Ts set by the temperature setting switch 17. Is adjusted by feedforward control and feedback control. Then, if the operation switch 16 is turned off,
Alternatively, the feedforward control and the feedback control as described above are executed until the flow of water (water flow) to the heat exchanger 2 is not detected with the closing operation of the tap 7a.

Further, in the water stop state where the water flow (water flow) to the heat exchanger 2 is not detected while the operation switch 16 is kept ON, the heat retention switch HS is turned ON and the heat retention lamp 24 is turned on. When the heat retention flag is ON, normal heat retention combustion control is executed (steps 1, 2, 5, 6, and 7). In other words, when the detected temperature Tk of the hot water temperature thermistor 23 becomes lower than the lower limit temperature for normal use (for example, the target temperature Ts for hot water supply), the heat retention combustion of the burner 3 is started, the combustion lamp 20 is turned on, and the heat exchanger 2 is turned on. Is not detected and the operation switch 16 is kept ON, the detected temperature Tk of the hot water thermistor 23 becomes the normal upper limit set temperature (for example, the set temperature α for the hot water target temperature Ts).
When the temperature becomes equal to or higher than the added temperature Ts + α), the intermittent valve 12 and the gas amount adjusting valve 13 are closed to stop the warm combustion of the burner 3, the combustion lamp 20 is turned off, and then the operation of the fan 4 is also stopped.

When the flow of water (water flow) to the heat exchanger 2 is detected during the execution of the normal heat-retaining combustion control, the normal combustion control described above is executed, and the operation switch 16 is turned off. Then, the intermittent valve 12 and the gas amount control valve 13 are closed to stop the heat keeping combustion of the burner 3 and the combustion lamp 20 is turned off, and then the operation of the fan 4 is also stopped.

Further, in the water stop state where the water flow (water flow) to the heat exchanger 2 is not detected while the operation switch 16 is kept ON, the heat insulation switch HS is turned ON and the heat insulation lamp 24 is turned on. And the heat retention flag is OFF
(Steps 1, 2, 5, and 6) or the operation switch 16 is turned off, and the sensors of the incoming water temperature thermistor 9 and the outgoing water temperature thermistor 10, the display unit 1
8 and the power to the display functions of the operation lamp 19 is cut off (step 1), the heat retention flag is turned off,
The warming switch HS is turned on to turn on the warming lamp 24, and when water flow (water flow) to the heat exchanger 2 is not detected (steps 8 to 10), manual warming combustion control is executed (steps 8 to 10). Step 11).

That is, the detected temperature T of the hot water thermistor 23
When k becomes equal to or lower than the manual lower limit set temperature (for example, a temperature obtained by subtracting 5 deg from the temperature obtained by adding 17 deg to the incoming water temperature Tn at that time), the intermittent valve 12 and the gas amount control valve 13 are opened to keep the burner 3 warm. To start the combustion lamp 20
Is turned on, and if the operation switch 16 is turned on and the flow of water to the heat exchanger 2 is not detected, the detected temperature Tk of the hot water thermistor 23 becomes the manual upper limit set temperature (for example, the input water temperature Tn). If the temperature exceeds 17 deg.), The intermittent valve 12 and the gas amount adjusting valve 13 are closed to stop the heat keeping combustion of the burner 3, the combustion lamp 20 is turned off, and then the operation of the fan 4 is also stopped. Then, when a set time (for example, one hour) for manual warming combustion has elapsed since the warming switch HS was turned on, the warming switch HS is automatically turned off.

During the execution of the manual warming combustion control, if water flow (water flow) to the heat exchanger 2 is detected while the operation switch 16 is turned on, the above-described normal combustion control is executed. When the operation switch 16 is turned OFF and water flow (water flow) to the heat exchanger 2 is detected, the intermittent valve 12 and the gas amount control valve 13 are closed to keep the burner 3 warm. After that, the operation of the fan 4 is also stopped.

[Another Embodiment] (1) In the above embodiment, a part of the water from the water inlet channel 5 is heated by the heat exchanger 2 and mixed with the water from the bypass channel 21, and is discharged from the hot water channel 7. However, the entire amount of water from the water inlet channel 5 may be heated by the heat exchanger 2 and discharged from the hot water channel 6. That is, as shown in FIG. 3, the heat exchanger 2 is provided with an inlet channel 5 for supplying the entire amount of water supplied from water supply or the like to the heat exchanger 2.
And a tapping path 7 for tapping the heated tap water from the tap tap 7a. During tapping, the detection information of the water flow rate sensor 8, the incoming water temperature thermistor 9, and the tapping temperature thermistor 10, and the temperature. Feed-forward control is executed based on the tapping target temperature Ts set by the setting switch 17, and feedback control is executed based on the deviation between the tapping temperature thermistor 10 and the tapping target temperature Ts. Hot water at the hot water target temperature Ts is discharged from the tap 7a.

(2) In the above embodiment, the operation switch 1
In the state where the hot water supply operation stop state is instructed at 6, when the execution of the warming operation is instructed by the warming switch HS, if the water is flowing, the warming combustion control is not executed. In a state where the hot water supply operation stop state is instructed by the switch 16, the warming combustion control may be executed even in the water flowing state.

(3) In the above embodiment, the heat retaining switch H
The time period after the ON operation of S is set as a time period during which the warm combustion control can be executed. However, time zone setting means for setting a time zone for the warm combustion is provided, and the time zone setting means sets the time zone. The time zone may be a time during which the warm combustion control can be performed. The time zone setting means may be of a manually operated type, or may be automatically set based on the execution frequency of the normal combustion control. The manual warming combustion control may be always executable until the warming switch HS is turned on and the warming switch HS is turned off artificially.

(4) In the above embodiment, the operation switch 1
Regardless of ON / OFF of 6, O of the heat retention switch HS
The manual warming combustion control accompanying the N operation and the normal warming combustion control after executing the normal combustion control are executed.
Irrespective of this, only the manual warming combustion control accompanying the ON operation of the warming switch HS may be executed.

(5) In the above embodiment, the mixing valve 22 for mixing hot and cold water at a constant mixing ratio is provided at the connection point between the hot water supply path 6, the hot water supply path 7, and the bypass path 21. A mixing valve that can change and adjust the mixing ratio of hot water and water in 7 may be provided.
When changing and adjusting the mixing ratio of hot and cold water in the hot water supply path 7, an opening degree adjustment valve may be provided in the bypass path 21 to adjust the mixing ratio.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater.

FIG. 2 is a flowchart showing a control operation of a control unit.

FIG. 3 is a schematic configuration diagram of a hot water supply apparatus showing another embodiment.

[Explanation of symbols]

 2 Heat Exchanger 3 Burner 5 Water Inlet 7 Hot Water Outlet 16 Operation Command Means 19 Operation Display Means 20 Burner Combustion Display Means 24 Heated Combustion Display Means H Control Means HS Heated Operation Command Means R Operating Device

Continued on the front page (72) Inventor Yoshihisa Fujita 1-152 Oka, Minami-ku, Minato-ku, Osaka-shi, Osaka F-term in Harman Co., Ltd. 3L034 CA04 CA05

Claims (5)

[Claims] 1. A water heating heat exchanger for heating water supplied through a water inlet channel by combustion of a burner to supply hot water to a hot water channel, control means for controlling combustion of the burner, a hot water operation state and hot water supply. An operation command means for instructing a switch to an operation stop state, and a warming operation command means for instructing execution of a warming operation are provided. In a state where the hot water operation state is commanded by the operation command means, The normal combustion control for controlling the combustion of the burner for tapping operation is performed in accordance with the state of water flowing to the heat exchanger, and the water is not passed to the heat exchanger. A hot water supply apparatus configured to execute warming combustion control for controlling combustion of the burner for the warming operation in response to the execution of the warming operation by the warming operation instruction means in a stopped state. Before In a state where the hot water supply operation stop state is instructed by the operation command means, the control means executes the warming combustion control in accordance with the instruction of the warming operation performed by the warming operation instructing means. Hot water supply device configured. 2. The method according to claim 1, wherein the control unit is configured to stop the water flow when the warming operation instruction unit instructs execution of the warming operation in a state in which the operation instruction unit instructs the tapping operation stop state. The hot water supply apparatus according to claim 1, wherein the hot water combustion apparatus is configured to execute the warming combustion control when in the state, and not to perform the warming combustion control in the water passing state. 3. The control means is configured to set a time period from when the execution of the heat retaining operation is instructed by the heat retaining operation command means to a set time to a time when the heat retaining combustion control can be executed. The hot water supply device according to claim 1. 4. A time zone setting means for setting a time zone for insulated combustion, wherein the control means sets a time zone set by the time zone setting means as a time in which the insulated combustion control can be executed. The hot water supply device according to claim 1, wherein the hot water supply device is configured as follows. 5. An operation device provided with the operation command means and the warm combustion command means, wherein the operation device displays on the operation device that the control means has been switched to an operation state by the operation command means. Operation display means, power-activated warm combustion display means for displaying execution of warm combustion control by the warm combustion command means, and the burner is burning for the warm combustion control. 5. A power-operated burner combustion display means for displaying the following.
The hot water supply device according to the item.