JP3531331B2 - 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 device, and in particular, a hot water supply device provided with an artificial heat source such as a gas burner or an oil burner is connected to a water discharge side of a water heater such as a solar water heater. The present invention relates to a hot water supply device having the above structure.

[0002]

2. Description of the Related Art In recent years, solar water heaters are becoming popular even in ordinary households due to the promotion of energy saving and the growing interest in the global environment. However, when hot water is supplied directly from the solar water heater to a curran, a shower, or the like, when the amount of hot water supplied increases, the hot water temperature may decrease, and it may be difficult to maintain the desired hot water temperature.

Therefore, in the prior art, for example, when the hot water outlet of a solar water heater is connected to the water inlet side of a heat exchanger that constitutes a gas water heater, and the temperature of the hot water from the water heater becomes low,
A hot water supply device is provided which is configured to reheat the hot water in the gas water heater to supply hot water at all times and to save the gas combustion amount on the gas water heater side at the same time. (For example, JP-A-1-118066)
(See Japanese Patent Publication).

By the way, in summer, the temperature of the hot water from the solar water heater rises, and may exceed 50 ° C., for example. When such a relatively high temperature hot water is discharged from the solar water heater to the gas water heater as it is, the hot water boils in the heat exchanger as soon as the hot water combustion on the gas water heater side is started. It will be extremely dangerous.

Therefore, in the prior art, when the temperature of the hot water discharged from the solar water heater exceeds a preset reference temperature (for example, 50 ° C.), hot water combustion is started from the viewpoint of preventing boiling. I try not to let it.

[0006]

In the hot water supply device of the prior art, the upper limit of the incoming water temperature is regulated only from the viewpoint of preventing boiling in the heat exchanger. However,
Even if the hot water temperature from the solar water heater is lower than the above-mentioned reference temperature (50 ° C in the above example), if the amount of hot water flowing from the hot water heater to the gas water heater is relatively small, the gas water heater side When hot water supply combustion is started, the hot water outlet temperature may become considerably high even if it does not boil in the heat exchanger. Under such circumstances, it is not uncommon for the tap water temperature to exceed 60 ° C, for example.

When such a situation occurs, hot water that is unexpectedly hot for the user is discharged, which may cause burns when directly touching the human body, which is extremely dangerous. Therefore, it is important to take preventive measures so that such hot water will not be discharged from the currant as it is.

Therefore, the inventors of the present invention have conducted extensive research in order to solve this problem, and have prototyped the following hot water supply device. In other words, this hot water supply device is dangerous because if hot water is ignited and burned when the amount of water flow is small, the hot water temperature is high, so it is ignited and burned when the amount of water flow is above a certain level. Detecting the temperature of water entering the heat exchanger that is heated by the gas and the amount of water entering the heat exchanger when the minimum water flow rate is exceeded, and heating this water with the minimum amount of gas that can maintain combustion. It is equipped with an outlet heated water temperature calculation means for calculating the expected outlet heated water temperature under the assumption. When the hot water temperature calculated by the hot water discharge temperature calculating means is dangerously high, the ignition to the gas burner is postponed or the combustion is stopped before the high temperature hot water is discharged.

In this prototype, in order to ignite the gas burner as quickly as possible, the tap water temperature calculating means repeatedly performs calculation when the operation switch is ON.

In this prototype, the expected hot water temperature is calculated in advance, and if the calculation result is a high temperature, the ignition is postponed, so the safety is extremely high. However, while trying out this prototype, I realized that this prototype was too user-friendly due to its emphasis on safety.

Specifically, this prototype has a problem that ignition delay is likely to occur, the rising of the hot water temperature is poor in the early stage of opening the currant, and the hot water temperature is not stable. This tendency is particularly strong when a small amount of hot water is discharged.

When the reason for this was examined, it was as follows. That is, in this prototype, the temperature of water entering the heat exchanger and the amount of water entering the heat exchanger are detected, the expected hot water temperature is calculated based on these values, and the operation switch is turned on to accelerate ignition as much as possible. In this state, the hot water outlet temperature calculation means repeatedly performs the calculation. However, there is no water flow in the first place when the karan is closed,
It is never ready for ignition. Also, in this prototype,
Since the minimum amount of water to pass is an extremely small amount of water, the hot water will come out unless the water temperature is extremely low. In other words, in this prototype, the ignition is ready only when the cullan is opened and there is a minimum amount of water flow.

In the specific ignition process, the currant opens, water is generated, the amount of water passing exceeds the minimum amount of water passed, the sensor detects this, and as a result of the calculation by the hot water temperature calculating means,
It was confirmed that the safe hot water temperature was reached, and only after this, ignition was performed. Among them, it takes a long time to open the currant and exceed the minimum amount of water flow until the amount of water flow exceeds a certain level, which is a safe hot water discharge temperature. Especially when the opening of the calan is small and a small amount of water is required, the increase curve of the water flow is gentle, and it takes time for the water flow to exceed a certain level, and the ignition timing is significantly delayed. Will end up.

As a result, the rising of the hot water temperature and the stability of the hot water temperature become poor. Therefore, an object of the present invention is to provide a water heater with a higher degree of perfection by further improving the above-mentioned prototype so as to achieve both safety and usability.

[0015]

The invention according to claim 1 for solving the above problems comprises a water heater having an artificial heat source, and a water heater heated by means different from the water heater. The hot water outlet side of the water heater is connected to the water inlet side of the water heater, and hot water from the water heater is supplied.
In a water heater that heats by an artificial heat source, it has a water temperature detecting means for detecting the water temperature of the heat exchanger constituting the water heater, and when the temperature detected by the water temperature detecting means is below a predetermined temperature. , Start the heating immediately
It becomes the ignition ready state that can be
Artificial when both the condition and the condition to detect the water flow are provided.
The hot water supply device is characterized by starting heating by a dynamic heat source .

Here, the predetermined temperature is a relatively low temperature such as 30 ° C. or 10 ° C. Even if hot water of this temperature is heated by the artificial heat source of the water heater, it is dangerously high temperature. It is a temperature that is hard to reach. The predetermined temperature may be a variable, but a constant is generally adopted. The predetermined temperature is a temperature at which the hot water discharge temperature becomes a safe temperature (hereinafter referred to as a specified temperature Tk) when the hot water of this temperature is flowed by the minimum amount of water passing through the water heater and heated by the minimum amount of heating. The specified temperature Tk referred to here is a temperature at which, for example, a person feels that the person is in contact with the hot water and is too hot, and does not get burned when the person leaves the hot water.
In addition, since there is also data that the hot water of 60 ° C. is burned for 5 seconds or more, the specified temperature Tk is set to 55 ° C. in the embodiment described later with a margin. However, of course, the specified temperature Tk is not limited to 55 ° C. This predetermined temperature is determined by the heating capacity of the water heater and the minimum water flow rate, and is generally a value specific to the water heater.

The hot water supply apparatus of the present invention has a water inlet temperature detecting means for detecting the water inlet temperature, and when the water inlet temperature detecting means is below a predetermined temperature, it is in a heating preparation state. That is, when the incoming water temperature is equal to or lower than the predetermined temperature, even a slight water flow does not suddenly increase to a dangerously high temperature after ignition / combustion. Further, according to the experiments of the present inventors, when the water temperature is below a predetermined temperature,
It was confirmed that the tap water temperature did not rise excessively due to the low temperature. In the present invention, the heating preparation state is set at a stage where the water flow rate is small, so that the heating preparation time is short. Then, the heating ready state allows quick ignition.

Further, claim 2 for achieving the same object.
The invention described in (1) has a water heater having an artificial heat source, and a water heater that is heated by a means different from the water heater, wherein the water outlet side of the water heater is connected to the water inlet side of the water heater. , Hot water from the water heater by an artificial heat source
In a water heater for heating, a water temperature detecting means for detecting a water temperature of a heat exchanger constituting the water heater, and a water amount detecting means for detecting a water amount of the heat exchanger or the entire water heater, Outlet temperature calculating means for calculating an expected outlet temperature when the heat exchanger is heated with the minimum capacity of the artificial heat source based on the inlet temperature detected by the inlet temperature detecting means and the inlet amount detected by the inlet amount detecting means. It is possible to quickly start the heating when the expected hot water temperature calculated by the hot water temperature calculation means is equal to or lower than a predetermined specified temperature.
The ignition ready state, and the conditions for the ignition ready state and
When both conditions for detecting water flow are provided, the artificial heat source
The hot water supply device is characterized by starting heating .

The present invention is an invention corresponding to the above-mentioned prototype and has extremely high safety.

Further, claim 3 for achieving the same object.
The invention described in (1) has a water heater having an artificial heat source, and a water heater that is heated by a means different from the water heater, wherein the water outlet side of the water heater is connected to the water inlet side of the water heater. , Hot water from the water heater by an artificial heat source
In a water heater for heating, a water temperature detecting means for detecting a water temperature of a heat exchanger constituting the water heater, and a water amount detecting means for detecting a water amount of the heat exchanger or the entire water heater, Outlet temperature calculating means for calculating an expected outlet temperature when the heat exchanger is heated with the minimum capacity of the artificial heat source based on the inlet temperature detected by the inlet temperature detecting means and the inlet amount detected by the inlet amount detecting means. If the expected hot water temperature calculated by the hot water temperature calculating means is below a predetermined specified temperature, or if the temperature detected by the water entering temperature detecting means is below a predetermined temperature, the heating is started immediately.
Ready for ignition, the ignition ready
When both the conditions for detecting the state and the conditions for detecting the water flow are provided
The hot water supply device is characterized by starting heating by an artificial heat source .

The hot water supply apparatus of the present invention uses the functions of the prototype described above in combination. In the hot water supply device of the present invention, if the calculated value of the expected hot water temperature is safe, or if the incoming water temperature is low and there is no risk of the hot water temperature rising too high, ignition will occur. Be ready . Therefore, even if the incoming water temperature is higher than the above-mentioned constant temperature, but the ignition temperature is not reached to the specified temperature Tk, the ignition preparation state is established and the hot water can be heated to the set temperature. The hot water temperature at this time is within the expected range, and the safety is extremely high.

Further, the invention according to claim 4 which is an improvement of the invention according to claim 2 or 3 is the hot water supply apparatus according to claim 2 or 3, in which the ignition preparation state is reached and / or once the ignition preparation state is passed. When heated again after being heated,
The calculation of the expected hot water temperature by the hot water discharge temperature calculation means and the comparison of the expected hot water temperature with the specified temperature are repeated, and the value of the specified temperature is set at the time of the first or several comparisons before reaching the ignition ready state and / or or once ignition ready state highest when comparing before reaching the first ignition ready state when reheated after being heated through, and wherein the lower is the time of the subsequent comparison.

The present invention, in comparisons made at a later time,
Since a value lower than the previous value is used, chattering of the device can be prevented.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will be described below. FIG. 1 is a system configuration diagram of a hot water supply device according to an embodiment of the present invention. The hot water supply device 1 of this embodiment is configured by combining a gas water heater 2 that uses gas as a heat source and a solar water heater 4 that uses solar heat as a heat source.

The gas water heater 2 includes a heating mechanism section 6, a controller section 8 and a remote controller section 10. In the heating mechanism section 6, the water inlet 14 is connected to the upstream side of the heat exchanger 12,
The hot water outlet 16 is connected to the downstream side of the heat exchanger 12. The water inlet passage 14 is connected to the hot water outlet side of the solar water heater 4 via a water passage switching valve 18, while the hot water outlet passage 16 is connected to a curran 20 or a shower (not shown). In addition, the water channel switching valve 18 is further provided with water supply 22
Are connected.

In the middle of the above-mentioned water inlet 14, the water inlet temperature T
Incoming water amount sensor 26 detects an incoming water temperature sensor 24, and input water Q _C detects the _C is also in the middle of the pouring channel 16 is provided with the hot water temperature sensor 28 for detecting a hot water temperature from the heat exchanger 12 ing.

Furthermore, for the heat exchanger 12 described above,
A gas burner 30 for heating this is arranged, and a gas proportional valve 34 and a solenoid valve 36 are provided in the middle of a gas pipe 32 connected to the gas burner 30.

On the other hand, the controller section 8 is composed of a microcomputer or the like, and includes a sequence control means 40 and an outlet heated water temperature calculation means 42.

The sequence control means 40 includes the incoming water temperature T _C detected by the incoming water temperature sensor 24 and the incoming water amount sensor 26.
The opening degree of the gas proportional valve 34 is adjusted so that the hot water temperature obtained by heating with the heat exchanger 12 becomes the preset temperature T _S preset by the remote control unit 10 based on the amount of incoming water Q _C detected in. adjusted to the well as feed-forward control of the gas combustion of the gas burner 30, if the hot water temperature T _H and the set temperature T _S that is detected by the hot water temperature sensor 28 do not match, both T _H · T based on the _S deviations, by adjusting the degree of opening of the gas proportional valve 34 to the hot water temperature T _H is equal to the set temperature T _S, is configured to feedback control of the gas combustion amount.

The sequence controller 40 prevents boiling when the temperature of the hot water from the solar water heater 4 detected by the incoming water temperature sensor 24 exceeds a preset reference temperature (here, 50 ° C.). Therefore, the hot water supply operation is not performed, and an ignition signal and a fire extinguishing signal are issued according to a flow chart described later. If there is more water than the minimum water flow rate, it will be "MOQ ON".

The outlet hot water temperature calculating means 42 is provided with the incoming water temperature T _C detected by the incoming water temperature sensor 24 and the incoming water amount sensor 26.
The expected hot water temperature TH _-MIN when the heat exchanger 12 is heated with the minimum capacity of the gas burner 30 is calculated based on the amount of incoming water Q _C detected in. In the calculation of the expected hot water temperature TH _-MIN in this case, for example, the following equation (1) is applied.

[0032] _{T H-MIN = {G MIN} × 25 / Q C} + T C ... Formula 1 G _MIN: lowest value of the hot water supply capacity Q _C; water supply

Further, the remote controller 10 has an operation switch for setting a hot water supply operation mode and a desired temperature T for hot water supply.
Setting switch for setting _S (both not shown)
Etc. are provided, and a command signal according to each switch operation is given to the controller unit 8.

Next, the operation of the hot water supply device 1 having the above configuration will be described with reference to the flowchart shown in FIG.

First, the remote controller 10 is operated to turn on the operation switch to set the operation mode in which the solar water heater 4 is also used (step 1). Then the controller section 8
The sequence control means 40 switches the water channel switching valve 18 so that the hot water from the solar water heater 4 communicates with the water inlet 14 of the gas water heater 2. Then, the process proceeds to step 2, and it is determined whether or not the incoming water temperature T _C detected by the incoming water temperature sensor 24 is equal to or higher than a preset reference temperature. Here, the reference temperature is a limit temperature at which water does not boil when passing through the heat exchanger of the gas water heater 2, and in the present embodiment, for example, 50 °.
C shall be adopted.

When the incoming water temperature T _C exceeds the reference temperature of 50 ° C., it is considered that the hot water temperature from the solar water heater 4 is sufficient, and such relatively hot water is directly supplied to the gas hot water. When entering the vessel 2 and starting hot water supply combustion, the hot water boils in the heat exchanger 12 and becomes extremely dangerous. Further, it can be said that there is no need to reheat with the gas burner 30 when the incoming water temperature T _C is as high as 50 ° C. or higher.

Therefore, in this case, the process does not proceed to the following steps and the gas burner 30 is not ignited. When the amount of hot water supplied increases and the temperature of the hot water discharged from the solar water heater 4 decreases in inverse proportion to this, the process proceeds from step 2 to step 3 and below in the same manner as described below, and the gas burner 30 is ignited and the calan Hot water temperature from 20 is maintained.

The incoming water temperature T _C is the reference temperature from the beginning 5
If the temperature is lower than 0 ° C, there is no fear of boiling in the heat exchanger 12, and therefore the process proceeds to step 3 and the ignition preparation is proceeded. That is, in the next step 3, the incoming water temperature T
_C is compared with a predetermined temperature T. The predetermined temperature T is an upper limit temperature at which it is unlikely that the heated hot water temperature of the gas hot water supply device 2 is immediately dangerous. The predetermined temperature T is a temperature that should be determined according to the specifications of the gas water heater 2, and when the water of this temperature is made to flow by the minimum amount of water passing through the water heater and is heated by the minimum amount of heating, the hot water temperature is safe. It is the temperature that becomes the boundary of whether or not it becomes a certain temperature.

More specifically, even if a minimum amount of water is passed through a water heater for general households and the water is heated with a minimum heating capacity, a safe temperature (set temperature Tk, for example, 5) is obtained.
It is determined whether or not hot water of 5 ° C or less) can be obtained. Here, the safe temperature is determined on the basis of, for example, data such as whether or not a person feels too hot when touching the hot water and gets burned when the person leaves the hot water.

If the incoming water temperature T _C is lower than the predetermined temperature T, even if it is heated by the gas burner 30,
Since high temperature hot water is not discharged immediately, skip step 4 to step 6 and move to step 7, and the flag for confirmation is "0" at step 6'in the middle.
Is set to the ignition ready state. That is, in the present embodiment, the ignition is ready even when there is no water flow in the gas water heater 2, so that the time required to prepare for ignition is short.

On the contrary, in step 3, the incoming water temperature T _C is
When it is determined that the temperature is higher than the predetermined temperature T, the routine proceeds to step 4, where the expected hot water temperature TH _-MIN is calculated. Specifically, the hot water outlet temperature calculation means 42 uses the heat exchanger 12 with the minimum capacity based on the incoming water temperature T _C detected by the incoming water temperature sensor 24 and the incoming water amount Q _C detected by the incoming water amount sensor 26.
The expected hot water temperature TH _-MIN when heating the
Calculate based on. If the value detected by the water input sensor 26 is zero or less than the minimum water flow rate, the expected hot water temperature TH _-MIN will be infinite or a considerably large value in the calculation. The expected hot water temperature is calculated based on the amount of water.

The expected hot water temperature T _H-MIN calculated by the hot water discharge temperature calculating means 42 is the preset temperature T.
Judge whether to exceed _K or not. The specified temperature T _K is a temperature at which there is no danger when tapping hot water, and in the present embodiment,
A constant value of 55 ° C shall be adopted.

When the expected hot water temperature T _H-MIN obtained by the hot water temperature calculating means 42 is 55 ° C. or higher, which is the specified temperature T _K , when the hot water of this temperature is directly discharged to the calan 20 or the like, Ignition of the gas burner should be used with caution as it can cause burns and is dangerous. Therefore, the flag for confirmation is set to "1".

The expected outlet temperature T _H-MIN is the specified temperature T.
If the temperature is less than 55 ° C, which is _K, it is considered that the risk is low even if this hot water is directly discharged to the calan 20 or the like, so the flag for confirmation is set to "0" and the ignition ready state is set. Become.

Then, the process proceeds to step 7 to determine whether or not the water flow rate satisfies the minimum water flow rate, that is, the MOQ is O.
Judge whether N or not. Here, if the water flow rate does not satisfy the minimum water flow rate and the MOQ is not ON, there is a risk that the water in the heat exchanger will boil, so the gas burner should not be ignited. Therefore, if it is determined in step 7 that the water flow rate does not meet the minimum water flow rate, return to step 1
Repeat the above steps again. In order to prevent chattering of the apparatus, the specified temperature T _K is, for example, 52 ° C. in the step repeated after the combustion state once, that is, the step repeated from the portion B in FIG.
Somewhat lower than in the previous case, such as
Also, during the repeated steps before reaching the combustion state,
In some cases, the specified temperature T _K , for example, 52 ° C., which is somewhat lower than the above value, may be applied.

On the contrary, when it is judged that the water flow rate satisfies the minimum water flow rate, there is no risk of boiling in the heat exchanger, and therefore the process proceeds to step 8 to proceed to the ignition process.
Then, in step 8, the flag is checked to see if ignition preparation is completed.

Here, when the flag is 1 and the ignition preparation is not completed, the routine proceeds to step 10, where the expected hot water temperature TH _-MIN is calculated again, and at step 11 the specified temperature T
Compared with _K. The operation in steps 10 and 11 is as follows.
The operation is substantially the same as that of steps 4 and 5 described above.
That is, the outlet water temperature calculation means 42 causes the inlet water temperature sensor 24
The heat exchanger 1 with the minimum capacity based on the incoming water temperature T _C detected in step S1 and the incoming water amount Q _C detected in the incoming water amount sensor 26.
The expected tap water temperature T _H-MIN when 2 is heated is calculated by the above _- mentioned formula (1). Subsequently, it is determined whether or not this calculated value exceeds a preset specified temperature T _K (here, 55 ° C.).

When the value calculated by the outlet heated water temperature calculating means 42 exceeds the specified temperature T _K while water is flowing, steps 11, 7, 8 and 10 are repeated until the outlet heated water temperature calculating means 42. It waits until the value calculated in step S1 becomes equal to or lower than the specified temperature T _K and preparation for ignition is completed. In order to prevent chattering of the apparatus, the specified temperature T _K is, for example, 52 ° C. in the step repeated after the combustion state once, that is, the step repeated again from the part A or B in FIG. , A somewhat lower number applies than in the previous case. In some cases, during the steps repeated before reaching the combustion state, the specified temperature T _K , for example, 52 ° C., which is somewhat lower than the previous value, may be applied.

When it is confirmed in step 8 that the flag is 0 and the preparation for ignition is completed, or when the expected hot water discharge temperature TH _-MIN is calculated again in step 10,
When it is confirmed that the specified temperature T _K is not _exceeded, and it is confirmed that the temperature is safe and the ignition is ready, the gas burner 30 is ignited in Step 9 or Step 12. Then, hot water supply combustion is started.

The steps up to this point, that is, the time speed until ignition is higher than that of the prototype described above.
The reason for this can be well understood by considering the flow of each step and the actual operation of the user. That is, in the specific use operation of the user, the case where the currant 20 is opened suddenly,
May open slowly. First, assuming a case where the user opens the currant 20 abruptly, in this case, since the amount of water input rises quickly, the amount of water input sensor 26 detects a large amount of water input at an extremely early time.

Therefore, the expected hot water discharge temperature T _H-MIN calculated in step 4 is low. Therefore, in step 5, it is determined to be YES, the process proceeds from step 6'to steps 7, 8 and 9, and the gas burner 30 is quickly ignited.

On the other hand, when the user opens the calan 20 slowly, the rise of the amount of water input is slow, and therefore it takes time to prepare for ignition in the steps of the above-mentioned route. However, in this embodiment, even in this case, if the incoming water temperature T _C is lower than the predetermined temperature T, the ignition preparation is started without waiting for the rising of the incoming water amount. Therefore, in any case, the gas burner 30 is quickly ignited.

In hot water supply combustion after the gas burner 30 is ignited, based on the incoming water temperature T _C detected by the incoming water temperature sensor 24 and the incoming water amount Q _C detected by the incoming water amount sensor 26,
The gas burner 30 is adjusted by adjusting the opening degree of the gas proportional valve 34 so that the preset temperature T _S set by the remote controller 10 is reached.
Feed forward control of the gas combustion amount of.

[0054] When the hot water temperature T _H and the set temperature T _S that is detected by the hot water temperature sensor 28 do not match, both T _H, based on the deviation T _S, the hot water temperature T _H
Is adjusted to the set temperature T _S , the opening of the gas proportional valve 34 is adjusted, and the gas combustion amount is feedback-controlled.

From this point, the following steps are
The timing of extinguishing the fire is monitored by monitoring the temperature change. That is, when combustion is started in steps 9 and 12, the process proceeds to step 13 and waits for a stable time. This stabilization time is mainly expected to stabilize the flow rate,
The waiting time is about a few seconds.

When this waiting time has elapsed, the routine proceeds to step 14, where the expected hot water temperature TH _-MIN is calculated again,
Further expected tapping temperature T _H-MIN and specified temperature T _K is compared in step 15. The operations in steps 14 and 15 are the same as steps 4 and 5 or steps 10 and 11 described above.
Is substantially the same as the operation of.

If the result of determination in step 15 is that the expected hot water outlet temperature T _H-MIN is lower than the specified temperature T _K , the routine proceeds to step 16, where it is determined whether or not the water flow rate is maintained, that is, "MOQ. ON ”is determined. If it is assumed that the water flow rate is maintained, it is determined that the calan 20 is still open, and therefore hot water combustion is continued. Then, the procedure returns to step 14, and steps 14 and 1
By repeating steps 5 and 16, the water flow state and the temperature change are continuously monitored. On the contrary, if it is determined in step 16 that the water flow has stopped, the process proceeds to step 17 to stop the combustion.

That is, the sequence control means 40 judges whether or not the water flow is stopped based on the detection output of the water quantity sensor 26. If the water flow is continued, the process returns to step 14 to continue the hot water supply combustion. If the water flow is stopped in step 16 and it is not "MOQ ON", the electromagnetic valve 36 is closed and the hot water combustion by the gas burner 30 is completed.

Then, the process goes to step 18 to confirm ON / OFF of the operation switch. Operation switch is OF
If it is F, the series of steps is ended and the operation switch is waited for ON again. If the operation switch is ON, the process returns to step 2 and the above process is repeated from the beginning. However, when repeating from step 2, the determination temperature in steps 5 and 11 is changed from 55 ° to 52 ° C in order to prevent chattering of the device.

On the contrary, if the result of determination in step 15 is that the expected hot water discharge temperature T _H-MIN is higher than the specified temperature T _K , combustion is temporarily performed in step 19 to avoid danger. Stop.

Then, the process proceeds to step 20, and it is confirmed whether or not water is passed, that is, "MOQ ON". If water is flowing, it is considered that the cause is a temporary decrease in the amount of water, and therefore the process returns to step 10 to prepare for ignition again. If there is no water flow, proceed to step 18 and turn on the operation switch.
After confirming the OFF state, the series of steps is ended, or the process returns to step 2 and the above steps are repeated from the beginning.

In the above embodiment, 55 ° C. is adopted as the specified temperature T _K. This temperature of 55 ° C. is the most suitable temperature to be adopted as the specified temperature T _K , but of course the present invention is not limited to this temperature, and other temperatures can be adopted. Further, it is possible to adopt a variable instead of a constant as the specified temperature T _K.
Therefore, an example in which a variable is adopted as the specified temperature T _K is shown below. FIG. 3 shows a part of the flowchart of this embodiment. In the flow chart of the present embodiment, the other parts are the same as those in the above-described embodiment, and therefore illustration and detailed description thereof are omitted.

In this embodiment, similarly to the previous embodiment, in step 3, the incoming water temperature T _C is compared with the predetermined temperature T. As a result, if the incoming water temperature T _C is higher than the predetermined temperature T, , Go to step 4 and predict the expected hot water temperature TH _-MIN
Is calculated. Then, in the next step 4 ', it is determined whether or not the set temperature T _S exceeds the tentacle temperature T _J. Here, the tentacle temperature T _J is a temperature at which the user feels hot when the hand is heated. Specifically, the tentacle temperature T _J is 4
About 8 ° C is recommended.

When the set temperature T _S is lower than the tentacle temperature T _J , the process proceeds to step 5 as in the previous embodiment, and the expected outlet temperature T _H-MIN is 55 ° which is the specified temperature T _K.
It is determined whether or not it is less than C, and the same steps as those in the previous embodiment are performed.

On the other hand, in step 4 ', the set temperature T
When it is determined that _S is higher than the tentacle temperature T _J , the specified temperature T _K is set to a variable, and a temperature higher than 55 ° C. is used as a reference. That is, when the set temperature T _S itself is higher than the tentacle temperature T _J , the user naturally expects that hot water will be discharged, and will not be directly put on the hand or showered. It is expected to be. Further, when the set temperature T _S exceeds the tentacle temperature T _J of 48 ° C., it is assumed that hot water may be mixed in the calan 20, and the risk is considered to be less than that in the case where hot water is not mixed.

Therefore, it can be considered that an accident will not occur even if a slightly hot water is discharged. Therefore, the set temperature T _S
When the temperature is high, the usability is prioritized and the specified temperature T _K is preferably higher. However, no matter how high the set temperature T _S is, it should be avoided that hot water far exceeding the expectation of the user is discharged. As the specified temperature, when the set temperature T _S is higher than the tentacle temperature T _J (48 ° C. in this example), it is set to T _S + α (α is a constant, for example, 5 ° C.).

Therefore, the hot water outlet temperature calculating means 42 heats the heat exchanger 12 with the minimum capacity based on the incoming water temperature T _C detected by the incoming water temperature sensor 24 and the incoming water amount Q _C detected by the incoming water amount sensor 26. Expected hot water temperature TH _-MIN
Is calculated based on the above equation (1).

When the expected hot water discharge temperature T _H-MIN obtained by the calculation is less than the specified temperature T _K (T _S + α) ° C,
The risk can be considered even lower, coupled with the assumption that hot and cold water mixing will take place in the curran 20.
Therefore, in this case, the flag is set to "0", the ignition preparation state is set, and the routine proceeds to step 7.

The expected hot water temperature T obtained by the inverse calculation
_{If H-MIN} exceeds (T _S + α) ° C, which is the specified temperature T _K , there is a danger of burns if hot water of this temperature is directly discharged onto the calan 20 or the like. Ignition should be careful. Therefore, the flag for confirmation is set to "1" and the process proceeds to step 7. The following is the same as the previous embodiment.

[0070] In this embodiment, only the pre-ignition process has been described that employs the variable as specified temperature T _K, may be employed a variable as well as a specified temperature T _K in step after ignition. Specifically, the set temperature T _S is the tentacle temperature T _J before and after step 10 and step 14 of the previous embodiment.
If a step for determining whether or not the temperature exceeds the set temperature T _S is higher than the tentacle temperature T _J , the specified temperature T _K is T _S + α (α is a constant, for example, 5 °).
Change to C).

FIG. 4 shows that after step 10, the set temperature T _S
6 is a flowchart showing an example in which a step of determining whether or not the temperature exceeds the tentacle temperature T _J is inserted. Also in FIG.
6 is a flowchart showing an example in which a step of determining whether or not the set temperature T _S exceeds the tentacle temperature T _J is inserted after step 14.

[0072] Also the above embodiment, switching the specified temperature T _K constants and variables in accordance with the set temperature T _S, determines whether exceeds 48 ° C set temperature T _S is tentacles temperature T _J By doing so, it is assumed that hot and cold water will be mixed in the Karan 20, etc.
It is also possible to set the above-mentioned (T _S + α) ° C as a standard temperature so that the hot water above (T _S + α) ° C is not always discharged.

The flowchart of FIG. 6 is uniform (T _S
The operation when + α) ° C is set to the specified temperature will be described. That is, in the flowchart of FIG. 6, from the viewpoint of preventing boiling in the heat exchanger 12 of the gas water heater 2, when the incoming water temperature T _C is equal to or higher than the reference temperature of 50 ° C., hot water supply combustion is not performed and the outgoing hot water temperature. The calculation point 42 is the same as in the above-described embodiment in that it calculates the expected hot water outlet temperature T _H-MIN when the heat exchanger 12 is heated to the minimum capacity using the equation (1).

However, in the above embodiment, step 5,
5 ', steps 12, 12', steps 15, 15 '
In the expected tapping temperature T _H-MIN is specified temperature T _K (55 ° C)
While it is determined whether or not it is less than or equal to or less than (T _S + α), in this embodiment, in this step 5, 11, 15, this calculated expected hot water temperature T is calculated.
_H-MIN is always the specified temperature (T _S + α) (α is 5 °, for example)
C) It is judged whether or not it becomes the above. Then, for example, in the step before ignition, if it is determined that the expected hot water discharge temperature T _H-MIN is equal to or higher than the specified temperature (T _S + α), ignition is postponed. If the step is before ignition, extinguish the gas burner.

It should be noted that the reference temperature and the specified temperature used in the above-described embodiment and modification are merely examples.
It is not limited to such specific numerical values. Further, in this example, the hot water obtained by heating with the heat exchanger 12 of the water heater 2 is directly supplied to the curran 20 or the like, but a bypass passage bypassing the heat exchanger 12 is provided to perform heat exchange. The present invention can also be applied to a gas heater having a so-called bypass mixing system in which hot water heated in the vessel 12 is mixed with water passing through a bypass passage to obtain a desired hot water temperature.

FIG. 7 is a system configuration diagram of the hot water supply apparatus according to the embodiment of the present invention which employs the bypass mixing method. When the bypass bath mixing method is adopted, the water input amount sensor 26 is provided upstream of the bypass passage and detects the total amount of water input into the gas water heater 2. Then, the expected hot water outlet temperature TH _-MIN after mixing is calculated by the above-mentioned formula 1.

The present invention can be widely applied not only to the gas water heater 2 but also to a water heater such as an oil water heater.

[0078]

The hot water supply apparatus of the present invention is ready for ignition when the temperature of entering water is low and the temperature does not rise to a dangerously high temperature immediately after heating. Therefore, the currant is opened and the hot water discharged is immediately heated, but it is safe because it is not excessively hot. In addition, according to the present invention, the ignition preparation state is set when the amount of water flow is small, so that the time required for heating is short. Therefore, the hot water supply device of the present invention, when the incoming water temperature is low, the currant is opened, heating is started immediately when the minimum water flow rate is reached, the rising of the hot water temperature is smooth, and the flow rate above the minimum water flow rate as in the past is used. There is no need to wait and start heating, which has the effect of being convenient.

In the invention according to claim 2, the expected hot water temperature is calculated in advance. When the calculation result is a low temperature, heating is performed, and when the calculation result is a high temperature, there is a function of refraining from heating. Although it is relatively high, it is possible to heat to the set temperature even when the set temperature is not reached. The hot water temperature at this time is within the expected range, and the safety is extremely high.

The invention according to claim 3 has the effects of the inventions according to claims 1 and 2, and has the effect of being highly safe and easy to use.

The invention according to claim 4 is effective in preventing chattering of the device.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the hot water supply device in FIG.

FIG. 3 is a flowchart for explaining the operation of another embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of another embodiment of the present invention.

FIG. 5 is a flowchart for explaining the operation of another embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of another embodiment of the present invention.

FIG. 7 is a system configuration diagram of a hot water supply device according to an embodiment of the present invention that employs a bypass mixing method.

[Explanation of symbols]

1 water heater 2 gas water heater 4 solar water heater 6 Heating mechanism section 8 controller 10 Remote control section 12 heat exchanger 14 Inlet 16 Dewaji 20 currants 24 Inlet temperature sensor 26 Water input sensor 28 Hot water temperature sensor 30 gas burner 34 gas proportional valve 40 Sequence control means 42 Hot water temperature calculation means

Front page continuation (72) Inventor Hisato Kataoka 93 Edo-machi, Chuo-ku, Kobe-shi, Hyogo Within Noritsu Co., Ltd. (56) References JP-A-1-118066 (JP, A) JP-A-7-71818 (JP, A) Actual development 1-100053 (JP, U) Actual development Sho 63-22555 (JP, U) Actual development Sho 62-105455 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) F24H 1/00

Claims (4)

(57) [Claims] 1. A water heater having an artificial heat source, and a water heater heated by means different from the water heater, wherein the water inlet side of the water heater is connected to the water outlet side of the water heater. Hot water from a water heater is heated by an artificial heat source.
In a hot water heater that heats, it has a water temperature detecting means for detecting a water temperature entering a heat exchanger that constitutes the water heater, and if the temperature detected by the water temperature detecting means is below a predetermined temperature, promptly Ignition preparation capable of starting heating
Condition and water flow is detected.
If both conditions are set, the heating by the artificial heat source is opened.
Hot water supply device characterized by starting . 2. A water heater having an artificial heat source, and a water heater heated by a means different from the water heater, wherein the water inlet side of the water heater is connected to the hot water outlet side of the water heater. Hot water from a water heater is heated by an artificial heat source.
In a hot water heater that heats, it has a water inlet temperature detecting means for detecting a water inlet temperature to a heat exchanger constituting the water heater, and a water inlet amount detecting means for detecting a water inlet amount to the heat exchanger or the entire water heater, Outlet temperature calculating means for calculating an expected outlet temperature when the heat exchanger is heated with the minimum capacity of the artificial heat source based on the inlet temperature detected by the inlet temperature detecting means and the inlet amount detected by the inlet amount detecting means. It is possible to quickly start the heating when the expected hot water temperature calculated by the hot water temperature calculation means is equal to or lower than a predetermined specified temperature.
Ignition preparation state, water condition and water
With an artificial heat source when both conditions for detecting flow are provided
A hot water supply device characterized by starting heating . 3. A water heater having an artificial heat source, and a water heater heated by means different from the water heater, wherein the water inlet side of the water heater is connected to the hot water outlet side of the water heater. Hot water from a water heater is heated by an artificial heat source.
In a hot water heater that heats, it has a water inlet temperature detecting means for detecting a water inlet temperature to a heat exchanger constituting the water heater, and a water inlet amount detecting means for detecting a water inlet amount to the heat exchanger or the entire water heater, Outlet temperature calculating means for calculating an expected outlet temperature when the heat exchanger is heated with the minimum capacity of the artificial heat source based on the inlet temperature detected by the inlet temperature detecting means and the inlet amount detected by the inlet amount detecting means. If the expected hot water temperature calculated by the hot water temperature calculating means is below a predetermined specified temperature, or if the temperature detected by the water entering temperature detecting means is below a predetermined temperature, the heating is started immediately.
The ignition ready state is
If both the conditions for detecting water flow and the conditions for detecting water flow are provided,
A hot water supply device characterized by starting heating by an industrial heat source . 4. The hot water supply apparatus according to claim 2, wherein the ignition preparation state is reached before and / or once ignition preparation is performed.
When re-heated after being heated via the state, and calculating expected tapping temperature by hot water temperature calculation means, compared with the expected tapping temperature and specified temperature are repeated, the value of the prescribed temperature, the point
Highest during the first or few comparisons before reaching the fire ready state , and / or the comparison before reaching the first ignition ready state when reheated after being heated through the ignition ready state , Hot water supply device characterized by a lower price in subsequent comparisons.