JP3602882B2 - Water heater - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a water heater used in a general home or the like.
[0002]
[Prior art]
FIG. 3 shows a system configuration of the water heater. In the figure, a water supply pipe 3 of a water supply passage is connected to the inlet side of the hot water supply heat exchanger 2. The water supply pipe 3 is provided with a water temperature sensor 10 such as a thermistor for detecting the water temperature, and a water supply amount (water supply amount). And a flow sensor 9 for detecting the flow rate of the heat exchanger). A hot water supply pipe 4 of a hot water supply passage is connected to an outlet side of the hot water supply heat exchanger 2, and a hot water tap 1 is provided at an outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water amount control valve 16 and a tapping temperature sensor 11 such as a thermistor for detecting tapping temperature.
[0003]
Below the hot water supply heat exchanger 2, a burner 7, an igniter electrode 18 for igniting the burner 7, a frame rod electrode 19 for detecting ignition, and a combustion fan 5 for supplying and exhausting gas are provided. A gas nozzle 6 is disposed opposite to the inlet, and a gas pipe 8 communicating with the gas nozzle 6 has a proportional control valve 13 for controlling a gas supply amount by an opening amount, and an original electromagnetic valve as a gas valve for opening and closing a gas pipe line. A valve 12 is interposed. The solenoid valves 20a and 20b are for switching the burner combustion surface.
[0004]
This type of water heater is provided with a control device 14, to which a remote control 15 is connected. The remote control 15 has an operation button 21 and a button 22 for setting a hot water temperature as shown in FIG. A set temperature display section 23 for setting a hot water supply temperature is provided. The control device 14 controls the hot water supply operation of the water heater using a sequence program. When the hot water tap 1 of FIG. 3 is opened, the flow sensor 9 detects the amount of incoming water, and the amount of incoming water is equal to or more than a certain value (minimum). The controller 14 rotates the combustion fan 5 in response to a signal from the flow sensor 9 when the operating flow becomes equal to or more than the operating flow. When the rotation of the combustion fan 5 enters a predetermined rotation region, the original solenoid valve 12, the solenoid valves 20a (or 20a, 20b) and the proportional control valve 13 are opened to supply gas to the burner 7, and the igniter electrode The ignition operation by 18 is performed.
[0005]
In the section where the temperature of the hot water from the ignition to the ignition is unstable, the combustion heat of the burner is controlled by the feedforward calculation, and after the hot water temperature approaches the set temperature, it is controlled by the proportional control by the feedforward and feedback calculations. The amount of heat of combustion is controlled. As shown in FIG. 4, the combustion control of the burner 7 is performed by the control operation of the combustion control unit 24 and the air volume control unit 25.
[0006]
The combustion control unit 24 is given in advance data on the relationship between the amount of combustion heat (combustion capacity) and the valve opening drive current (gas supply amount) of the proportional control valve 13, and the combustion control unit 24 detects the input water temperature sensor 10. The incoming water temperature, the hot water temperature detected by the hot water temperature sensor 11, the flow rate of the flowing water detected by the flow rate sensor 9, and the set temperature set by the remote controller are received, and the incoming water temperature is raised to the set temperature. , Ie, the amount of combustion heat that matches the tap water temperature to the set temperature, is calculated, and a valve-opening drive current is supplied to the proportional control valve 13 so that the amount of combustion heat is obtained. The amount is varied to control the amount of gas supplied to the burner 7.
[0007]
On the other hand, the air volume control unit 25 controls the rotation of the combustion fan 5 so as to supply the burner 7 with combustion air corresponding to the amount of combustion heat determined by the combustion control unit 24. In this way, the combustion control of the combustion control unit 24 and the air volume control by the air volume control unit 25 are performed in a matching manner, and hot water of a stable set temperature is supplied from the hot water supply heat exchanger 2 to the desired hot water supply place via the hot water supply pipe 4. Supplied.
[0008]
When the use of hot water is finished and hot water tap 1 is closed, flow stoppage is detected by flow sensor 9, and upon receiving the detection signal of the stoppage of water supply, control device 14 shuts off original electromagnetic valve 12. The combustion of the burner 7 is stopped.
[0009]
[Problems to be solved by the invention]
The combustion operation of the water heater is started when the flow rate sensor 9 detects that the flow rate of water flowing from the water supply pipe 3 to the hot water supply heat exchanger 2 is equal to or higher than the minimum operating flow rate (normally 2 liters / min). The combustion operation is performed by calculating the amount of combustion heat within the combustion control range of the minimum combustion capacity and the maximum combustion capacity set in the control unit 24.
[0010]
As is well known, the minimum combustion capacity in the combustion control range of the water heater is not zero, and generally, the value of No. 2.5 (No. 1 means the ability to increase the flow rate of 1 liter / min by 25 ° C.) Therefore, if the incoming water temperature is as high as, for example, 30 ° C., even if the water heater is operated by burning, for example, to discharge 35 ° C. hot water, the minimum combustion capacity of the water heater is 2.5. , The amount of heat of the minimum combustion capacity is much larger than the amount of heat required to increase the incoming water temperature of 30 ° C. to the set temperature of 35 ° C., and therefore is lower than the set temperature. When the hot water is supplied with a considerably high temperature and the hot water tap 1 is squeezed, the hot water temperature becomes higher and higher than the set temperature because the flow rate is small. Is disturbed by hot water users, and in extreme cases Is, there is a danger that the burns.
[0011]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to immediately burn when hot water having a temperature higher than a set temperature is discharged when the incoming water temperature is high. It is to provide a water heater which can stop and stop the safety.
[0012]
[Means for Solving the Problems]
The present invention is configured as follows to achieve the above object. That is, the present invention provides a burner, a hot water supply heat exchanger heated by the burner, a flow rate sensor for detecting a flow rate of water flowing through the hot water supply heat exchanger, and an inflow water temperature for detecting an incoming temperature of water entering the hot water supply heat exchanger. In a water heater having a temperature sensor and a control device for controlling a burner combustion amount within a range of a combustion capacity so as to make a tapping water temperature equal to a set temperature, a minimum combustion capacity is determined based on a water flow rate detected by the flow rate sensor. An uncontrollability detection unit that determines that the tapping temperature is uncontrollable and outputs an uncontrollable detection signal when the tapping temperature during burner combustion is expected to rise beyond a predetermined determination temperature range with respect to the set temperature. A combustion stopping unit for receiving a control failure detection signal output from the control failure detection unit and cutting off fuel supply to the burner to stop burner combustion, and supplying hot water from the water supply passage. Characterized in that the water passage toward the hot water supply passage through the exchanger, the opening and closing control valve is provided for opening and closing the water passage, provided the water supply passage blocking part that closes forcing the opening and closing control valve undergoing uncontrollable detection signal It is configured as
[0013]
In addition, the uncontrollable detection signal output from the uncontrollable detecting section, to have uncontrolled informing means for informing the uncontrollable state of the hot water temperature, and the minimum operating flow rate of the water passage capable combustion control operation, incoming water Based on the detected temperature and the data, the estimated tapping temperature when the lowest operating flow rate of water is heated with the combustion heat of the minimum combustion capacity is calculated, and when the estimated tapping temperature falls within the determination temperature range with respect to the set temperature, the combustion stoppage is stopped. It is also a characteristic feature of the present invention that operation recovery means for resetting the reset state of the lock state and the lock state of the opening / closing control valve closed by the water supply passage blocking unit is provided.
[0014]
[Action]
In the present invention having the above-described configuration, a determination temperature at which a predicted hot water supply temperature is given with respect to a set temperature regardless of the combustion at the minimum combustion capacity of the water heater from the water flow rate detected by the flow sensor before the water heater is ignited. When it is predicted that the temperature rises beyond the range, the uncontrollability detecting unit determines that the tapping temperature is in the uncontrollable state, notifies the effect, stops the combustion, and shuts off the water passage .
[0015]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same names as those in the conventional example, and the duplicate description thereof will be omitted. The system configuration of the water heater of the present embodiment is almost the same as the system of the conventional example shown in FIG. 3, and the feature of the present embodiment different from the conventional example is that the control device 14 A special circuit for performing safety processing by judging the condition, the provision of a water solenoid valve 17 as an open / close control valve for opening and closing the hot water supply passage in the hot water supply pipe 4, and the control of the tapping temperature by the remote control 15 This is to provide a notifying means for notifying the disabled state, and the other configuration is the same as that of the conventional example.
[0016]
FIG. 1 shows a block configuration of a combustion control device 14 of a water heater in the present embodiment. The control device 14 includes a combustion control unit 24, an air volume control unit 25, a control disable detection unit 26, and a control disable notification unit. 27, a water passage blocking part 28, a combustion stopping part 30, and an operation recovery means 31. The control operations of the combustion control unit 24 and the air volume control unit 25 are the same as those in the conventional example, and thus the description thereof is omitted.
[0017]
The out-of-control detection unit 26 includes a temperature comparison unit 32 and an over-temperature detection unit 33. The temperature comparison unit 32 taps when the water heater burns with the minimum combustion capacity based on the flow rate detected by the flow rate sensor. The expected hot water temperature is compared with a set temperature set by a remote controller or the like, and the comparison result is added to the over-temperature detection unit 33. The judging temperature range for judging the uncontrollable state of the tapping temperature is given to the over-temperature detecting section 33 in advance, and the over-temperature detecting section 33 sets the estimated tapping temperature based on the comparison result of the temperature comparing section 32. When it is expected that the temperature rises beyond the determination temperature range with respect to the set temperature, it is determined that the tapping temperature is uncontrollable, and the uncontrollable detection signal is output from the uncontrollable detection signal to the uncontrollable notification unit 27, It is added to each of the combustion stopping sections 30.
[0018]
The uncontrollable notification unit 27 receives the uncontrollable detection signal from the uncontrollable state detection unit 26 and notifies that it is impossible to control the tapping temperature to the set temperature. This notification mode can take various forms. For example, a remote controller 15 as shown in FIG. 2 is provided with a light emitting section 34 using an LED or the like, and the light emitting section 34 emits light continuously or blinks. To notify the uncontrollable state of the tapping temperature by turning off (turning off) the display of the set temperature displayed on the set temperature display section 23, or to notify the set temperature display section 23 of the set temperature and the set temperature. The current tapping temperature is alternately displayed. Further, a current temperature display section 35 is provided in addition to the set temperature display section 23, and the current temperature (current tapping temperature that cannot be controlled) is displayed on the current temperature display section 35. Is displayed to notify the uncontrollable state of the tapping temperature.
[0019]
Furthermore, the remote controller 15 is provided with a display section 36 of a liquid crystal screen, and this display section 36 indicates that the tapping temperature is in an uncontrollable state using characters or codes, It may be configured to notify that there is a message by displaying a message. Further, the remote control 15 is provided with an audio notification unit 37, for example, to indicate that the tapping temperature is in an uncontrollable state by a buzzer sound or by using an artificial synthetic sound. The configuration may be such that the notification is made by voice. The specific configuration of the uncontrollable notification unit 27 is configured in an appropriate form according to the specifications.
[0020]
The water supply passage shutoff unit 28 receives the uncontrollability detection signal from the uncontrollable detection unit 26 and forcibly closes the water electromagnetic valve 17 to lock the closed state.
[0021]
The combustion stopping unit 30 receives the control failure detection signal from the control failure detection unit 26, shuts off the original solenoid valve 12, stops the gas supply to the burner 7, stops the hot water supply operation, and locks the stopped state.
[0022]
The operation recovery means 31 incorporates a built-in heating hot water temperature calculation based on information on the set temperature, the minimum operating flow rate of the water flow that allows the water heater to perform the combustion operation, and the water temperature detected by the water temperature sensor 10. By the unit, the heating temperature is calculated by calculating the heating temperature when it is assumed that the water heater has heated the water at the incoming water detection temperature with the calorific value of the minimum combustion capacity, and when the estimated heating temperature falls within the determination temperature range with respect to the set temperature, It is determined that the uncontrollable state of the hot water temperature has been resolved, and a reset release signal is sent to the water supply passage blocking unit 28 and the combustion stopping unit 30.
[0023]
In response to the reset release signal, the water supply passage blocking unit 28 releases the closed valve lock state of the water solenoid valve 17, and the combustion stopping unit 30 releases the closed valve lock state of the original solenoid valve 12, so that the hot water supply combustion operation is started. It is restored to a possible state.
[0024]
According to the present embodiment, when the incoming water temperature to the water heater is high, and even when the water heater is operated with the minimum combustion capacity, the outlet water temperature becomes too high than the set temperature, and it becomes impossible to control the outlet water temperature. When it is anticipated, the control failure detection unit outputs the control failure detection signal, so that various measures can be taken using the control failure detection signal. By reporting the control impossible state by the control impossible notification means 27 using the control impossible detection signal, the user of the water heater can know the control state of the tapping temperature by the notification, and set the water supply temperature from the water heater. It can be understood that the hot water having a temperature far exceeding the temperature is not a failure of the water heater, but rather that the temperature of the incoming water is too high.
[0025]
In addition, the burner combustion is immediately stopped by the combustion stopping unit 30 in response to the uncontrollable detection signal, thereby avoiding the danger of touching a high temperature much higher than the set temperature and causing discomfort or burns. be able to.
[0026]
Further, in the present embodiment, the water electromagnetic valve 17 is closed and the water passage is shut off by the uncontrollable detection signal. Therefore, the original electromagnetic valve 12 is closed by the combustion stopping unit 30 and the hot water supply combustion operation is stopped. It is no longer necessary to leave the water flowing from the hot-water tap 1 while the water is kept flowing.
[0027]
Further, in this embodiment, the provision of the operation recovery means 31 allows the water solenoid valve 17 to be closed when the temperature of the incoming water drops and hot water having a temperature falling within the determination temperature range with respect to the set temperature can be discharged. Since both the valve lock state and the valve closing lock state of the original solenoid valve 12 are released, the hot water supply combustion operation is automatically restored immediately, which is very convenient in terms of usability.
[0028]
Generally, on a hot summer day, the incoming water temperature may be as high as 30 ° C. In such a case, the set temperature is set at a temperature close to the incoming water temperature, for example, 35 ° C. Then, the tapping water temperature becomes uncontrollable, but warm water accumulated in the pipe on the water supply pipe 3 side flows out by using water in a kitchen or the like, and the water on the water supply pipe 3 side has a low temperature. When the water is replaced, the hot water supply operation is restored to a state in which the hot water supply operation is possible by the operation recovery means 31. Further, for example, a pipe of a solar system is connected to the water supply pipe 3 side, and the temperature of the water heated by solar heat is reduced. Even when high water is introduced into the water supply pipe 3 side, since the incoming water temperature becomes high, the outflow water temperature becomes uncontrollable, but when the high temperature water of the solar system is used up in the kitchen or the like. And the water pipe 3 When the water supply temperature to the water heater becomes low when the pipe is switched from the pipe of the water system to the water pipe, the operation of the water heater is enabled by the operation recovery means 31 even in such a case. Will be recovered automatically.
[0029]
Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments .
[0030]
For example , in this embodiment, when the control impossible detection signal is output from the control impossible detection unit 26, the notification of the control impossible state and the combustion stop are both performed, but only one of them is performed. Is also possible.
[0031]
Further, in this embodiment, the operation recovery means 31 is provided, and when the temperature of the incoming water decreases and the hot water within the determination temperature range with respect to the set temperature can be discharged, the water heater is automatically recovered to the operable state. However, the operation recovery means 31 can be omitted.
[0032]
Further, in this embodiment, a single-function water heater (water heater having only a hot water supply function) has been described. However, the present invention is also applied to a combined water heater having both a hot water supply function and a reheating function.
[0033]
【The invention's effect】
The present invention is configured such that, when the incoming water temperature becomes high and hot water within the determination temperature range with respect to the set temperature cannot be discharged, the state is detected by the uncontrollable detecting unit, and the uncontrollable detection signal is output. Therefore, it is possible to take various measures using the uncontrollability detection signal.
[0034]
In the present invention, since by using the uncontrolled detection signal configured to stop hot water supply combustion, and hot water is high temperature water much than the set temperature, uncomfortable touching the high-temperature hot water In addition, in extreme cases, it is possible to avoid dangers such as burns by touching hot water.
[0035]
Further, in a configuration in which the control of the tapping temperature is impossible in response to the control impossible detection signal, the user of the water heater is notified that the tapping temperature becomes high. It is not a failure of the water heater, but it can be known that hot water has come out due to the high incoming water temperature, and it is free from the hassle of misjudging that the water heater has failed and having trouble coping with it. Can be
[0036]
Further, in the present invention, the opening / closing control valve is closed in response to the uncontrollability detection signal, and the water passage is shut off. Therefore , after the combustion is stopped in a state where the tapping temperature is uncontrollable, the tapping valve is closed. If not, the water passage is automatically shut off, so that the trouble of closing the hot tap can be omitted, and wasteful outflow of water can be avoided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of an embodiment of a water heater according to the present invention.
FIG. 2 is an explanatory diagram of a configuration of a remote controller connected to the control device of the water heater.
FIG. 3 is a system configuration diagram of a water heater.
FIG. 4 is an explanatory diagram showing a main configuration of a control unit of a conventional water heater.
[Explanation of symbols]
14 Control device 15 Remote controller 24 Combustion control unit 25 Air flow control unit 26 Uncontrollable detection unit 27 Uncontrollable notification unit 28 Water supply passage shutoff unit 30 Combustion stop unit 31 Operation recovery means

Claims (3)

A burner, a hot water supply heat exchanger heated by the burner, a flow rate sensor for detecting a flow rate of water flowing through the hot water supply heat exchanger, an input water temperature sensor for detecting an input temperature of water entering the hot water supply heat exchanger, and an outlet temperature. And a control device for controlling the burner combustion amount within the range of the combustion capacity so as to match the set temperature with the set temperature. An uncontrollable detection unit that determines that the tapping temperature is uncontrollable and outputs an uncontrollable detection signal when the temperature is expected to rise beyond a predetermined determination temperature range with respect to the set temperature; And a combustion stop portion for receiving fuel supply to the burner to stop the burner combustion by receiving the uncontrollability detection signal output from the burner, and for supplying hot water from the water supply passage through the hot water supply heat exchanger. Water passage toward the opening and closing control valve is provided for opening and closing the water passage, a water heater, characterized in that a water supply passage blocking part that closes forcing the opening and closing control valve undergoing uncontrollable detection signal. A burner, a hot water supply heat exchanger heated by the burner, a flow rate sensor for detecting a flow rate of water flowing through the hot water supply heat exchanger, an input water temperature sensor for detecting an input temperature of water entering the hot water supply heat exchanger, and an outlet temperature. And a control device for controlling the burner combustion amount within the range of the combustion capacity so as to match the set temperature with the set temperature. and uncontrollable detecting unit that outputs to uncontrollable detection signal determines that uncontrollable state of tapping temperature when the temperature is expected to rise beyond the predetermined judgment temperature range for the set temperature, the uncontrollable detecting unit uncontrollable detection signal output from the receive and uncontrollable informing means for informing the uncontrollable state of the hot water temperature, the uncontrollable detection signal output from the uncontrollable detecting section, burners And a combustion stop portion for stopping the burner combustion by shutting off the fuel supply, and an opening / closing control valve for opening and closing the water passage is provided in the water passage from the water supply passage to the hot water supply passage through the hot water supply heat exchanger, A water heater comprising a water supply passage shutoff unit for forcibly closing the open / close control valve in response to a control disable detection signal . Based on data of the minimum operating flow rate of the water passage capable of performing the combustion control operation and the detected input water temperature, an estimated tapping temperature is calculated when the minimum operating flow rate of water is heated with the combustion heat of the minimum combustion capacity. claim 1 or claim operation recovery means is provided for resetting unlock the closing of the opening and closing control valve by the water supply passage cutoff portion and the locked state of the combustion stops when the temperature falls determination temperature range for the set temperature 2. The water heater according to 2 .

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