JP3132236B2 - 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 water heater having improved tapping temperature characteristics when the operation is stopped and restarted.

[0002]

2. Description of the Related Art In recent years, there has been a demand in the market for water heaters having improved temperature characteristics of hot water supplied when the operation is stopped and restarted.

[0003] A conventional water heater will be described below. Conventionally, this type of water heater has a configuration as shown in FIG . That is, the water passes through the water inlet temperature detection device 1 and the hot water supply water amount detection device 2 from the water inlet, absorbs heat in the hot water supply heat exchanger 4 heated by the hot water supply burner 3, becomes hot water, and is discharged from the faucet 6. Next, when the faucet 6 is closed and the water amount signal of the hot water supply amount detecting device 2 disappears, the combustion of the hot water supply burner 3 is stopped. When the combustion of the hot water is stopped, the hot water supply heat exchanger 4
The temperature of the hot water remaining in the passage rises due to the residual heat of the hot water supply heat exchanger 4 (so-called post-boiling), and the hot water remains for a relatively short time.
For example, in order to prevent the hot water from coming out when restarting after one minute, the hot water blower
For a predetermined time (usually 5 minutes) at a constant speed to cool the hot water remaining in the passage of the heat exchanger 4 for hot water supply.

[0004]

However, in the above-described conventional configuration, the hot water supply burner 3 is provided regardless of whether the bath burner 15 constituting the bath circuit provided in the water heater is in a combustion state or a non-combustion state. The hot water blower 9 was operated at a constant rotation speed after the operation was stopped. In other words, in recent years, the water heater has been made more compact, and in the arrangement where the hot water burner 3 and the bath burner 15 are extremely close to each other, if the bath burner 15 is in a combustion state, the heat from the bath burner 15 and the bath heat exchanger 16 is reduced. Although the temperature inside the appliance rises due to the radiant heat, for example, the temperature of the hot water supply heat exchanger 4 and the air inside the appliance rises, the hot water supply blower 9 is operated at a constant rotation speed to operate the hot water supply heat exchanger 4. Therefore, the hot water remaining in the passage of the hot water supply heat exchanger 4 is hardly cooled. Accordingly, when the hot water supply burner 3 is restarted for a relatively short time after the operation is stopped, for example, one minute later, there is a problem that the post-boil W becomes large as shown in 1 in FIG .

Further, if the rotation speed of hot water blower 9 is increased even though bath burner 15 is in a non-combustion state to prevent boiling, hot water remaining in the passage of hot water supply heat exchanger 4 is cooled. When the operation is restarted after a relatively long time, for example, 5 minutes, there is a problem that the so-called pre-cooling D increases as shown in 3 of FIG. 4 and cold water comes out.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. By reducing post-boil without increasing pre-cooling when restarting hot water supply, the present invention provides excellent hot water temperature characteristics during intermittent use of hot water supply. It is intended to provide an easy-to-use water heater.

[0007]

In order to achieve the above-mentioned object, a first means of the water heater according to the present invention comprises a bath heat exchanger for radiating radiant heat to an adjacently installed hot water heat exchanger; A hot water supply operation detector and a bath operation detector each detecting a heating operation state by a burner of a heat exchanger for bath and a heat exchanger for bath, and a combustion air to the burner and a cooling air to both heat exchangers. When the hot water supply blower and bath blower to be supplied by controlling the rotation speed and the hot water supply operation detector detects the heating stop, the number of rotations of the hot water supply blower is controlled according to the detection signal of the bath operation detector and rotated for a required time. It is equipped with control means, and the bath operation detector detects the heating operation of the burner.
A timer for measuring a predetermined combustion time B from when it is informed,
A signal indicating whether or not this timer has measured a predetermined combustion time B.
Control means for controlling the rotation speed of the hot water blower according to the
It is a thing.

Further, the second means of the water heater according to the present invention measures the predetermined combustion time B from the start of the heating operation of the burner according to a signal from the bath operation detector, and stops the heating operation of the burner after an arbitrary time has elapsed. A timer for measuring a predetermined stop time C from the stop, and control means for controlling the number of revolutions of the hot water blower according to the presence or absence of a measurement signal of the predetermined stop time C from the timer.

[0009]

According to the first aspect of the present invention , when the bath burner is in a combustion state when the combustion of the hot water supply burner is stopped and the combustion state has continued for a predetermined combustion time B or more and the temperature in the appliance is sufficiently high, the first means described above. since you are increasing the rotational speed of the hot water supply blower that operates by a required time, the water remaining in the path of the hot water supply heat exchanger can be quickly cooled, without increasing the pre-cooled during the restarting operation of the water heater, After boiling can be reduced.

Further, the bath burner is in a non-combustion state by the above-mentioned second means. After the combustion state of the bath burner before the non-combustion state continues for a predetermined combustion time B or more, the non-combustion state of the bath burner is determined. When the temperature inside the appliance has not yet dropped because the combustion state has not elapsed for the predetermined stop time C or more, the number of rotations of the hot water blower that operates only for the required time is slightly increased, so that it remains in the passage of the heat exchanger for hot water supply. Hot water can be cooled quickly, and post-boiler can be reduced without increasing pre-cooling when restarting hot water supply.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

[0012] Figure 1 shows a common structure to the first and second embodiment is different only in that there is a rotational speed switching control means 21 and the timer 24 of the hot water supply air blower 9 as compared with FIG. First, a hot water supply circuit will be described. Water passes through a water inlet temperature detection device 1 and a hot water supply water amount detection device 2 from a water inlet.
The heat is absorbed by the hot water supply heat exchanger 4 heated by the hot water supply burner 3 to become hot water, which is discharged from the faucet 6 through the hot water supply hot water temperature detection device 5. The gas passes through a hot water supply source solenoid valve 7 and a hot water supply gas proportional valve 8 from a gas inlet, and passes through a hot water blower 9.
Thus, the fuel is burned by the hot water supply burner 3. 9a is a hot water supply operation detector for detecting the combustion state. The operation start of the water heater is input by the operation switch 11 of the external input device 10, and the set temperature is input by the hot water temperature switches 11a and 11b of the external input device 10. When a water amount signal is input by the hot water supply water amount detection device 2, the water heater starts burning, and the signals from the input water temperature detection device 1, the hot water supply water amount detection device 2, the hot water supply and outlet temperature detection device 5, and the external input device 10 are used. ,
The controller 23 controls and operates the gas supply hot water solenoid valve 7, the hot water supply gas proportional valve 8, and the hot water supply combustion blower 9 so that the set tapping temperature is attained.

Next, the bath circuit will be described. Water in a bathtub (not shown) is sucked by a pump 13, passes through a circulating temperature detector 14, and is absorbed by a bath heat exchanger 16 heated by a bath burner 15. It becomes hot water, which is drained into the bathtub. The gas passes from a gas inlet through a bath solenoid valve 17 and a bath gas proportional valve 18 and a bath blower 19.
Thus, it is burned in the bath burner 15. A bath operation detector 22 detects the combustion state. The operation start of the bath is input by the operation switch 20 of the external input device 10, and the bath combustion is continued until the temperature of the hot water in the bathtub reaches the set temperature or the operation switch 20 is pressed again to stop the operation, and is independent of the hot water supply circuit. And burn.

FIG. 2 shows a control sequence according to the first embodiment of the present invention. S1
Then, the operation switch 11 of the external input device 10 is turned "ON", and the set temperature is inputted by the hot water supply temperature switches 11a and 11b. When the faucet 6 is opened in S2 and water flows in the water passage and the amount of water detected by the hot water supply water amount detection device 2 becomes equal to or more than the amount of ignition water, the ignition sequence starts in S3. In S4, the combustion amount of the hot water supply burner 3 is determined based on the input signals of the external input device 10, the input water temperature detection device 1, and the hot water supply water amount detection device 2, and S5, S
At 6, the combustion amount of the hot water supply burner 3 is adjusted so that the input signal of the hot water supply / outflow temperature detecting device 5 and the input signal of the external input device 10 become the same. When the faucet 6 is closed in S7 and the amount of water detected by the hot water supply water amount detecting device 2 becomes equal to or less than the fire extinguishing water amount, the combustion of the hot water supply burner 3 is stopped in S8. In S9, the combustion state of the bath burner 15 at this time is detected by the bath operation detector 22, and when the bath burner 15 is not burning, the hot water blower 9 operates at the rotation speed N1 within the required time A in S10. If the bath burner 15 is burning in S9, the bath
The combustion state of the burner 15 has continued for a predetermined combustion time B or more.
When there is no hot water blower 9 in S12, it is required at rotation speed N3.
It operates within time A. In S11, the fuel of bath burner 15
If the burning state has continued for the predetermined combustion time B or longer, S1
At 3, the hot water blower 9 is operated within the required time A at the rotation speed N4.
You. Here, the rotation speed N3 <the rotation speed N4.

Next, if the amount of water detected by the hot water supply water amount detecting device 2 becomes equal to or more than the ignition water amount within the required time A from the stop of combustion of the hot water supply burner 3 in S14, the process returns to S3. When the required time A has elapsed since the stoppage of the combustion of the hot water supply burner 3 in S15, S16
Then, the hot-water blower 9 stops and returns to S2.

FIG. 3 shows a control sequence according to a second embodiment of the present invention. Steps S1 to S9 in FIG. 3 are the same as those in FIG. When the bath burner 15 is burning in S9, the hot water blower 9 operates at the rotation speed N2 within the required time A in S11. Further, the bath burner 15 is in a non-combustion state in S9, and the bath burner 1 before the non-combustion state is in S10.
After the combustion state of No. 5 has continued for the predetermined combustion time B or more, S12
If the non-combustion state of the bath burner 15 has passed the predetermined stop time C or more at S13, the hot water blower 9 rotates the rotation speed N5 at S13.
And operates within the required time A. In S12, bath burner 1
When the non-combustion state of No. 5 has not elapsed for the predetermined stop time C or more, the hot water blower 9 rotates at N6 and the required time A at S14.
Operates inside. Here, the rotation speed N5 <the rotation speed N6.

Next, if the water amount detected by the hot water supply amount detecting device 2 becomes equal to or more than the ignition water amount within the required time A from the stop of combustion of the hot water supply burner 3 in S15, the process returns to S3. When the required time A has elapsed since the stoppage of the combustion of the hot water supply burner 3 in S16, S17
Then, the hot-water blower 9 stops and returns to S2.

[0018] As described above, since depending on the combustion state and the non-combustion state of bath burner 15 during shutdown of the water heater switch the rotational speed of the water heater blower <br/> machine 9, FIG when restarting operation of the hot water supply 4 1 boiling W and then shown in the, to reduce the cold D before shown in 3 of FIG. 4, small rear boiling and before cold at re-operation, as shown in 2 and 4 in FIG. 4, the shower, etc. It becomes an easy-to-use water heater with excellent hot water supply characteristics during continuous use.

[0019]

As described above, the water heater according to the present invention is claimed in claim 1.
Then, when the hot water supply burner stops heating, the timer measures a predetermined combustion time B from the time when the bath operation detector detects the heating operation of the bath burner, and when the bath heat exchanger is in the heating operation state by the bath burner, When the amount of radiant heat to the heat exchanger for hot water is large, the number of rotations of the hot water blower is increased by an amount corresponding to an increase in the amount of after-heating of the water stored in the heat exchanger for hot water by adding the received heat of the radiant heat to the heat storage of the heat exchanger for hot water. By increasing the number, it is possible to adjust the effect of the bath heat exchanger on the post-boiler of the hot water supply heat exchanger.

Furthermore in claim 2 water heater of the present invention, when the hot water supply burner has stopped heating, the predetermined combustion time B from the heating operation start of the bath burner by a signal from the bath operation detector
Is measured by the timer, the heating operation of the bath burner is stopped, the predetermined stop time C from this stop does not elapse, and the bath heat exchanger is heated by the bath burner, and the radiation to the hot water supply heat exchanger is performed. When the heat is large, the heat storage for the hot water supply heat exchanger itself is added to the heat received by the radiant heat, and the number of rotations of the hot water supply blower is increased by an amount corresponding to an increase in boiling after the water stored in the hot water supply heat exchanger. The effect on the after-boiling of the heat exchanger for hot water supply by the heater can be adjusted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water heater according to first and second embodiments of the present invention.

FIG. 2 is a diagram showing a control sequence of a water heater according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a control sequence of a water heater according to a second embodiment of the present invention.

FIG. 4 is a characteristic diagram of hot water supply

FIG. 5 is a configuration diagram of a conventional water heater.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 hot water supply burner 4 hot water supply heat exchanger 9 hot water supply blower 9 a hot water supply operation detector 15 bath burner 16 bath heat exchanger 19 bath blower 21 rotation speed switching control means 22 bath operation detector 24 timer

Claims (2)

(57) [Claims] 1. Radiation installed adjacent to a heat exchanger for hot water supply
A heat exchanger for a bath that radiates heat, a heat exchanger for the hot water supply,
And heating operation by each burner of the bath heat exchanger
Hot water supply operation detector and bath operation detection to detect each state
And air for combustion to the burner and the heat exchanger to both heat exchangers.
A hot water blower and a bath blower for supplying cooling air,
When the hot water supply operation detector detects heating stop, the
Operation of the hot water blower according to the detection signal of the hot water operation detector
And control means for controlling the time, a timer for measuring a predetermined burning time B from the time the bath operation detector detects the heating operation of the <br/> burner, whether the timer has measured a predetermined combustion time B water heater and a control means for controlling the rotational speed of the hot water supply air blower according to Kano signal. 2. Radiation installed adjacent to a heat exchanger for hot water supply
A heat exchanger for a bath that radiates heat, a heat exchanger for the hot water supply,
And heating operation by each burner of the bath heat exchanger
Hot water supply operation detector and bath operation detection to detect each state
And air for combustion to the burner and the heat exchanger to both heat exchangers.
A hot water blower and a bath blower for supplying cooling air,
When the hot water supply operation detector detects heating stop, the
Operation of the hot water blower according to the detection signal of the hot water operation detector
And control means for controlling the time, the by a signal from the bath operation detector from the heating operation start of the burner by measuring a predetermined combustion time B stops the heating operation of the burner after an arbitrary time, from the stopping a timer for measuring a predetermined stop time C, water heater and a control means for controlling the rotational speed of the hot water supply air blower in accordance with the presence or absence of a predetermined stopping time C of the measurement signal from the timer.