JPH10160245A - One-can two-channel bath hot water supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-can two-channel bath hot water supply equipment for preventing an inaccurate bath tube water level from being detected due to a hot water-supply single operation and hence an equipment from malfunctioning. SOLUTION: A hot water-supply single operation monitoring part 44 monitors to see whether a hot water-supply single operation is being made or not. A pump drive part 48 drives a circulation pump 20 until a predetermined pump drive time passes after a hot water-supply single operation. The hot water of a reheating circulation channel is replaced by the drive of the circulation pump 20, and at the same time a reheating heat exchanger is cooled, thus stabilizing the sensor output of a water level sensor 28 in a small amount of time. A combustion operation control part 43 suspends the water level detection operation by the water level sensor 28 due to the water level detection-stopping operation of a water level detection stopping part 47, thus preventing an accurate bath tub water level from being detected during hot water-supply single operation and until the drive of the circulation pump 20 stops due to the pump drive part 48 after hot water-supply single operation, namely during the unstable period of the sensor output of the water level sensor 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can-two-channel bath water heater in which a hot water supply heat exchanger and a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner. is there.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a system configuration of a one-can-two-channel bath water heater developed by the applicants. In this figure, this one-can two-channel bath water heater (apparatus) has a combustion chamber 1, in which a burner 2 is disposed. A burning heat exchanger 4 is provided. The hot water supply heat exchanger 3 and the reheating heat exchanger 4 are disposed integrally. That is, a hot water supply heat exchanger 3 is formed by penetrating a plurality of common fin plates 5 with a hot water supply side pipe, and a hot water supply heat exchanger 3 is similarly mounted by penetrating a fin plate 5 with a supplementary heating side pipe.
The burner 2 is configured to heat both the hot water supply heat exchanger 3 and the additional heating heat exchanger 4.

The combustion chamber 1 below the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Air is sent to the burner 2 via the burner 6, and exhaust gas generated by combustion of the burner 2 is discharged to the outside from an exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.

[0004] A gas nozzle 19 is provided opposite to the gas inlet of the burner 2, and the gas nozzle 19 is connected to a gas supply passage 8 for introducing a fuel gas.
The fuel gas guided by the gas supply passage 8 is supplied to the burner 2 via a gas nozzle 19. The gas supply passage 8 has solenoid valves 10 and 11 for opening and closing the passage.
a, 11b, and a proportional valve 12 for controlling the gas supply amount based on the valve opening amount.

[0005] A water supply passage 1 is provided on the inlet side of the hot water supply heat exchanger 3.
3 is connected to one end of a hot water supply heat exchanger 3, and one end of a hot water supply passage 14 is connected to the outlet of the hot water supply heat exchanger 3.
Is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is guided to a desired hot water supply place such as a kitchen through the external pipe. The hot water supply heat exchanger 3
A bypass path 15 and a bypass path 16 for short-circuiting the water supply passage 13 on the inlet side and the hot water supply path 14 on the outlet side are provided, and the bypass passage 16 is provided with an electromagnetic valve 17 for opening and closing the passage. I have.

A line 1 is provided on the inlet side of the reheater 4.
8 is connected, the other end of the conduit 18 is connected to the discharge port of the circulation pump 20, one end of the return pipe 21 is connected to the suction port of the circulation pump 20, and the return pipe 21
Is connected to the bathtub 22 at the other end. One end of a pipe 23 is connected to the outlet side of the reheater 4, and the other end of the pipe 23 is connected to the bathtub 22. The return pipe 21, the pipe 18, and the reheating heat exchanger 4
And the pipeline 23 constitute a reheating circulation passage 24.

The pipe line 18 of the additional heating circulation passage 24 and the hot water supply passage 14 are communicated by a hot water supply passage 25. The hot water supply passage 25 has a pouring control valve 26 for controlling opening and closing of the passage, and a bathtub. And a water level sensor 28 for detecting the water level of the nozzle 22 by water pressure.

Reference numeral 30 shown in the figure is an air volume sensor for detecting the air volume in the combustion chamber 1, 31 is a water volume sensor provided in the water supply passage 13 for detecting the flow rate of the water supply, and 32
Reference numeral 34 denotes a water temperature sensor for detecting the temperature of water in the water supply passage 13, reference numeral 34 denotes a flow control valve provided in the water supply passage 14 to control the flow rate of hot water, and reference numeral 35 denotes a flow control valve provided in the water supply passage 14 to supply hot water. Reference numeral 36 denotes a hot water supply confirmation switch for detecting that water is flowing, a reference numeral 36 denotes a water flow sensor for detecting the flow of water in the reheating circulation passage 24, and reference numeral 37 denotes a temperature (bath temperature) of hot water in the reheating circulation passage 24 in the bathtub. A bath temperature sensor, which is a reburning circulation passage temperature sensor, detects the temperature of the hot water produced by the hot water supply heat exchanger 3.

[0009] This one-can-two-channel water heater has a control device 4
0 is provided, and the remote controller 4
1 is connected. The remote controller 41 has hot water supply temperature setting means for setting the hot water supply temperature, bath temperature setting means for setting the temperature of the bath in the bathtub 22, bath water level setting means for setting the water level of the hot water in the bathtub 22, and bathtub 22. An automatic operation button or the like is provided for starting a series of automatic operations of the bath from the hot water filling to the heat retention.

The control device 40 fetches sensor output signals of various sensors and information of the remote controller 41, and performs operations of various operation modes such as a hot water supply operation and a bath automatic operation in accordance with a given sequence program. Control.

For example, when the faucet of the hot water supply passage led to the kitchen or the like is opened, water flows from the water supply source into the water supply passage 13 and the water amount sensor 31 detects the flow of water through the water supply passage 13.
The appliance starts operation in the hot water supply mode. First, the rotational drive of the combustion fan 7 is started to open the solenoid valve 10 and / or one or both of the solenoid valves 11a and 11b, thereby supplying fuel gas to the burner 2 through the gas supply passage 8 to a point not shown. The burner 2 is ignited by the ignition means to start combustion.

The opening amount of the proportional valve 12 is controlled (by controlling the amount of gas supplied to the burner 2) so that the hot water temperature becomes the hot water setting hot water temperature set in the remote controller 41. The hot water of the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water at a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.

When the use of hot water is finished and the faucet is closed,
When the water supply to the hot water supply heat exchanger 3 is stopped and the water amount sensor 31 stops detecting the water supply through the water supply passage 13, the solenoid valve 1
0 is closed to stop the burner 2 from burning. Thereafter, when a predetermined post-purge period (for example, 5 minutes) has elapsed, the rotational drive of the combustion fan 7 is stopped to end the operation in the hot water supply mode and prepare for the next hot water supply.

When the automatic operation of the bath is instructed by the automatic operation button of the remote controller 41, the operation in the hot water filling mode is first started as shown in step 101 of the flowchart of FIG. For example, when the pouring control valve 26 is opened and water flows from the water supply source into the water supply passage 13 by the opening operation of the pouring control valve 26, and the water amount sensor 31 detects the flow of water through the water supply passage 13, the hot water supply The combustion of the burner 2 is started similarly to the operation.

Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is supplied to the hot water supply passage 14 and the hot water supply passage 2.
5, the hot water which has been sent into the reheating circulation passage 24 through the reheating circulation passage 24 is dropped into the bathtub 22 in two paths, a path passing through the return pipe 21 and a path passing through the reheating heat exchanger 4. It is. When the water level in the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the pouring control valve 26 is closed, the solenoid valve 10 is closed, and the combustion of the burner 2 is stopped. The mode operation ends.

After the operation in the hot water filling mode, as shown in step 102 of FIG. 4, the circulating pump 20 is driven to circulate the hot water in the bathtub 22 through the additional heating circulation passage 24 to stir the hot water in the bathtub 22. , Step 103
Then, the bath temperature of the bathtub 22 is detected by the bath temperature sensor 37, and in step 104, it is determined whether the detected bath temperature Th is lower than the set temperature Ts of the bath, and the bath temperature Th is determined.
Is lower than the set temperature Ts, the routine proceeds to step 110, where the operation in the reheating mode is started.

For example, by continuing to drive the circulation pump 20, the water in the bathtub 22 is circulated through the reheating boiler circulation passage 24, and the combustion of the burner 2 is started.
With the combustion flame of the burner 2, the circulating hot water is heated by the reheating heat exchanger 4 to perform reheating. When it is determined in step 104 that the bath temperature Th detected by the bath temperature sensor 37 has reached the set temperature Ts, the combustion of the burner 2 is stopped, and the operation in the reheating mode is ended.

Then, as shown in step 105, the circulation pump 20 is stopped, and at the same time, the time measurement by the timer built in the control device 40 is started, and the operation in the warming mode is started.

For example, as shown in step 106, the measured time tc of the timer is set to a predetermined set time ts.
(For example, 30 minutes) is determined. When it is determined that the measurement time tc has reached the set time ts,
The operations from step 102 to step 105 are performed. If the bath temperature Th is lower than the set temperature Ts, reheating is performed to maintain the bath temperature Th at the set temperature Ts.

During the period in which it is determined in step 106 that the measured time tc of the timer has not reached the set time ts, the operation in the water retention mode shown in steps 107, 108 and 109 is performed.

First, at step 107, the water level sensor 28
Captures the sensor output of The water level sensor 28 detects the water pressure of the hot water in the hot water passage 25 as the water pressure of the bathtub 22, and outputs the water pressure of the bathtub water level as a sensor output. The controller 40 is given in advance PQ data as shown by a solid line A in FIG. 5 representing the relationship between the sensor output (P) detected and output by the water level sensor 28 and the amount of water (Q) in the bathtub 22. The water level of the bathtub 22 is detected by referring to the sensor output of the water level sensor 28 with the PQ data.

At step 108, it is determined whether or not the detected water level Pk of the bathtub 22 is lower than the set water level Ps. If the water level Pk of the bathtub 22 is not lower than the set water level Ps. When determined, the water level sensor 2
When the water level Pk of the bathtub 22 is determined to be lower than the set water level Ps due to the use of hot water by the bather, the water level detection operation of Step 8 is repeated by the operation of Step 106 and thereafter. The hot water filling operation is started, the hot water is poured into the bathtub 22, and the water level Pk of the bathtub 22 is raised to the set water level Ps.

The operation in the water retention mode is repeated until the measured time tc of the timer reaches the set time ts.

The operation in the heat retaining mode including the water retaining operation is as follows.
This is performed for a predetermined period (for example, for 4 hours after the bath is heated).

As described above, the one-can-two-channel bath water heater uses a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated using the common burner 2, so that they are separately provided. The system configuration can be simplified as compared to the system in which the provided hot water supply heat exchanger and the reheating heat exchanger are each heated and burned by using separate burners, thereby reducing the size and cost of the system. I can plan.

[0026]

By the way, when the one-can-two-channel bath water heater performs only the hot water supply operation without performing the reheating operation, the accurate operation immediately after the hot water supply alone operation is performed for the following reasons. It was found by experiments by the applicants that the water level in the bathtub 22 could not be obtained.

During the hot water supply operation alone, the hot water stays in the reheating heat exchanger 4. When the burner 2 is burned for the hot water supply operation, only the hot water supply heat exchanger 3 is activated by the combustion flame of the burner 2. However, since the reheating heat exchanger 4 is also heated, the retained hot water in the reheating heat exchanger 4 is heated. For this reason, the temperature of the retained hot water in the reheating heat exchanger 4 rises to a state close to boiling.

The high-temperature heated water in the reheating heat exchanger 4 flows to both sides of the inlet pipe 18 and the outlet pipe 23 of the reheating heat exchanger 4 due to a convection phenomenon. The temperature of the hot water in the hot water circulation passage 24 and the hot water passage 25 which is a communication passage communicating with the hot water circulation channel 24 is, for example, 70 to 80 ° C. due to the heat of the high-temperature hot water flowing out of the heat exchanger 4. Rises to quite high temperatures.

As described above, when the temperature of the hot water in the hot water passage 25 rises to a high temperature, the predetermined temperature range of the water level sensor 28 (for example, a water temperature range that guarantees accurate water level detection (for example, 5 to 48 ° C.)), the water level sensor 28 cannot detect an accurate water pressure, and as shown in FIG.
The sensor output of No. 8 shifts upward or downward with great temperature dependency, despite the fact that the water level in the bathtub 22 has not changed.

In addition, as described above, the reheater 4
The high-temperature heated hot water in the inside flows out to both sides of the pipeline 18 on the inlet side and the pipeline 23 on the outlet side of the reheating heat exchanger 4, and the reheater 4 from both sides of the pipeline 18 and the pipeline 23. A convection in which lukewarm water flows into the inside of the inside of the tank causes irregular vibrations in the hot water circulation passage 24 and the hot water in the hot water passage 25 due to the convection of the hot water, so that the hot water in the hot water passage 25 becomes irregular. Due to the vibration, the sensor output of the water level sensor 28 vibrates irregularly, as shown in FIG.

As described above, when the hot water in the reheating heat exchanger 4 is heated at a high temperature during the hot water supply alone operation, the rise in the temperature of the hot water in the hot water filling passage 25 and the irregular vibration are synergistically involved. The sensor output of the water level sensor 28 fluctuates irregularly, and based on the sensor output of the water level sensor 28, the bathtub 2
It is difficult to accurately detect the second water level.

As described above, it becomes difficult to accurately detect the water level in the bathtub 22 due to the hot water supply alone operation. For example, the hot water supply interruption is performed during the automatic water holding mode operation, and the hot water supply alone operation is performed. When this is performed, when the output of the water level sensor 28 shifts upward, a water level higher than the water level of the bathtub 22 is detected, and the water retention operation is performed even though the water level of the bathtub 22 is lower than the set water level. There is a case where a malfunction such as the absence occurs. In addition, the water level sensor 28
When the output of FIG. 2 shifts downward, a water level lower than the water level of the bathtub 22 may be detected.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a malfunction of an appliance due to an irregular fluctuation of a water level sensor output caused by a single operation of hot water supply. An object of the present invention is to provide a two-channel water heater.

[0034]

Means for Solving the Problems To achieve the above object, the present invention has the following structure to solve the above problems. In other words, the first invention heats the water supplied from the water supply passage and sends it to the hot water supply passage, and the hot water supply heat exchanger incorporated in the bath tub hot water recirculation passage and circulates the bath tub hot water through the additional heat recirculation passage. A recirculation pump, a reheating heat exchanger that is incorporated in the reheating circulation passage, and reheats the circulating hot water circulating in the reheating circulation passage by driving the recirculation pump, and detects the temperature of the water provided in the reheating circulation passage. A reheating heating passage temperature sensor, and a water level sensor disposed in the reheating heating circulation passage or a communication passage communicating with the reheating heating circulation passage and detecting a water level of hot water in a bathtub by a water pressure; The heat exchanger is integrated, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heat exchanger is provided. In a one-can-two-canal bath water heater in which a water level detection operation is performed by a sensor, a single-can-two-canal bath water heater monitors whether or not a single-can, two-canal bath water heater performs only a hot water supply operation without performing a reheating operation. An operation monitoring unit; a pump driving unit that drives the circulation pump until a predetermined pump driving time elapses after the hot water supply operation is stopped; and a water level detection operation by the water level sensor is stopped until the circulation pump stops after the hot water operation alone. And a water level detection stop section as means for solving the above problem.

According to a second aspect of the present invention, there is provided a hot water supply heat exchanger for heating water supplied from a water supply passage and sending it out to the hot water supply passage, and a bath tub hot water circulating through the supplementary heating circulation passage incorporated in the bath tub hot water circulation passage. A recirculation pump, a reheating heat exchanger that is incorporated in the reheating circulation passage, and is provided in the reheating circulation passage to detect reheating of the circulating hot water circulating in the reheating circulation passage by driving the recirculation pump. And a water level sensor disposed in the additional heating circulation passage or a communication passage communicating with the additional heating circulation passage and detecting the level of hot water in the bathtub by water pressure. The heating heat exchanger is integrated, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heating heat exchanger is provided. In a one-can-two-canal bath water heater in which a water level detection operation is performed by a position sensor, a hot-water supply that monitors whether the one-can-two-canal bath water heater performs only hot water supply operation without performing reheating operation. An isolated operation monitoring unit; when the hot water temperature detected by the reheating heating circulation passage temperature sensor becomes higher than a predetermined threshold temperature during the hot water single operation, a predetermined pump driving time elapses after the hot water single operation is stopped. A pump drive unit for driving the circulating pump until the circulating pump is driven by the pump driving unit after the hot water supply alone operation; and a water level detection stopping unit for stopping the water level detecting operation by the water level sensor until the circulating pump is stopped. The configuration provided as a means for solving the above-mentioned problem.

A third aspect of the present invention is based on the configuration of the first or second aspect of the invention, and furthermore, based on the hot or cold water temperature detected by the additional heating circulation passage temperature sensor during the hot water supply alone operation or when the hot water supply alone operation is stopped. The above-mentioned problem is solved by a configuration having a time setting unit for variably setting the pump driving time.

In the invention having the above configuration, for example, the hot water single operation monitoring unit monitors whether or not the one-can-two-channel bath water heater is performing the hot water single operation, and whenever the hot water single operation is performed, or Only when the hot water temperature detected by the additional heating circulation passage temperature sensor during the hot water supply alone operation becomes equal to or higher than the predetermined threshold temperature, the pump driving unit is operated until the predetermined pump drive time elapses after the hot water supply alone operation. Drive the circulation pump. The water level detection stop unit stops the water level detection operation by the water level sensor until the circulation pump stops when the circulation pump is driven by the pump driving unit after the hot water supply alone operation.

As described above, by driving the circulation pump after the hot water supply operation alone, the hot water in the reheating circulation passage starts to flow, and the accumulated hot water and the additional water in the reheating heat exchanger heated to a high temperature by the hot water supply operation alone. Staying water in the recirculation passage and the communication passage communicating with the reheating circulation passage flows into the bath tub, and the water in the reheating circulation passage is replaced. Cool the reheat-fired heat exchanger.

Therefore, in a short time after the hot water supply alone operation, the temperature of the hot water at the position where the water level sensor is disposed drops to the guaranteed temperature of the water level sensor, and the reheating by the high temperature heating of the reheating heat exchanger. Irregular hot and cold vibrations in the circulation passage and the communication passage can be suppressed, and the sensor output of the water level sensor can be stabilized in a short time.

According to the present invention, as described above, the operation of detecting the water level by the water level sensor is stopped when the circulation pump is driven after the hot water supply operation alone. In other words, since the water level detection operation by the water level sensor is stopped until the sensor output of the water level sensor is stabilized by the circulating pump drive after the hot water supply alone operation, the sensor output of the water level sensor that fluctuates irregularly due to the hot water supply alone operation is reduced. An incorrect bathtub level is prevented from being detected on the basis of this, and a malfunction of the appliance operation due to the incorrect bathtub level is prevented.

[0041]

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

The one-can two-channel water heater of the first embodiment has the system configuration shown in FIG. 3, and FIG. 1 is a block diagram showing the characteristic control configuration in this embodiment by solid lines. Is represented. Since the system configuration shown in FIG. 1 has been described above, a duplicate description thereof will be omitted.

As shown by the solid line in FIG.
A hot water single operation monitoring unit 44, a data storage unit 46,
Water level detection stop section 47, pump drive section 48, timer 5
1 is provided.

A sequence program of various operation modes such as hot water supply and automatic operation is given to the combustion operation control unit 43 in advance. According to the sequence program, various sensor outputs and information of the remote controller 41 are taken in. Performs operation in various operation modes.

The hot water supply independent operation monitoring unit 44 takes in the operation information of the combustion operation control unit 43, and based on this information, the pouring control valve 26 is closed and the water flow sensor 36 When the water supply in the heating circulation passage 24 is not detected and the water amount sensor 31 detects the water supply in the hot water supply passage 14, it is detected that the hot water supply alone operation is being performed. Sometimes, it is detected that the hot water supply independent operation is not performed, and it is monitored whether the hot water supply independent operation is performed.

The water level detection stop unit 47 takes in the monitoring information of the hot water supply independent operation monitoring unit 44 and, when it detects that the one-can-two-channel bath water heater (apparatus) has started the hot water supply independent operation based on this information. Then, it is determined that there is a possibility that the sensor output of the water level sensor 28 fluctuates irregularly due to the hot water supply alone operation, and the output of the water level detection stop command signal for stopping the water level detection operation by the water level sensor 28 is started. This command signal is output to the combustion operation control unit 43 and the combustion operation control unit 4
3 indicates that when the hot water supply interrupt is performed during the operation in the operation mode including the water level detection operation by the water level sensor 28 such as the hot water filling mode or the water retention mode and the hot water supply independent operation is performed,
Upon receiving the water level detection stop command signal, the water level detection operation by the water level sensor 28 is stopped.

When the pump drive unit 48 detects that the hot water sole operation has been completed based on the monitoring information of the hot water single operation monitoring unit 44, the pump drive unit 48 drives the circulation pump 20 to start the circulation of the hot water in the additional heating circulation passage 24. At the same time, the timer 51 is reset and driven to start measuring the elapsed time from the end of the hot water supply independent operation, and the timer 51 starts to capture the measured time. At the same time, the pump drive section 48 outputs a pump drive signal indicating that the circulation pump 20 is being driven to the water level detection stop section 47.

[0048] The water level detection stop section 47 is provided for
Upon receiving the pump drive signal from the pump drive unit 48, the output of the water level detection stop command signal to the combustion operation control unit 43 is continuously performed. With the continuous output of the water level detection stop command signal, the combustion operation control section 43 continues the water level detection stop operation by the water level sensor 28.

Then, the pump driving unit 48 determines the pump driving time t which is predetermined and stored in the data storage unit 46.
ps (for example, 3 minutes), and compares the pump drive time tps with the time measured by the timer 51.
When the measured time reaches the pump drive time tps, the drive of the circulation pump 20 is stopped, and at the same time, the output of the pump drive signal to the water level detection stop unit 47 is stopped.

As described above, when the circulation pump 20 is driven after the hot water supply operation alone, the water in the bathtub 22 enters the reheating circulation path 24, and the water retained in the reheating circulation path 24 is supplied to the bathtub 22. The water flows out and the hot and cold water in the reheating circulation passage 24 is replaced. Further, the heat of the reheating heat exchanger 4 heated to a high temperature due to the hot water supply alone operation is taken away by the flow of the reheating circulation passage 24 and flows out to the bathtub 22, so that the reheating heat exchanger 4 is cooled. You.

As described above, by driving the circulation pump 20 after the hot water supply alone operation, the time required for the hot water in the reheating circulation passage 24 to be replaced and the reheating heat exchanger 4 to be cooled is determined by experiments, calculations, and the like. The obtained time is stored in the data storage unit 46 as the pump drive time tps. As described above, the circulating pump 20 is driven until the pump drive time tps elapses after the hot water supply alone operation, and The hot and cold water in the heating circulation passage 24 can be reliably replaced, and the reheating heat exchanger 4 can be cooled.

For this reason, the circulation pump 2
When the driving of the water level sensor 28 is stopped, the temperature of the hot water at the position where the water level sensor 28 is disposed drops to the guaranteed temperature of the water level sensor 28, and
Hot water vibration of the reheating heat exchanger 4 is suppressed, and the sensor output of the water level sensor 28 is stable.

The water level detection stop section 47 is provided when the pump drive section 48 stops outputting the pump drive signal, that is, when the pump drive section 48 stops driving the circulation pump 20. It is determined that the output of the water level detection stop command signal to the combustion operation control unit 43 is determined to be stable based on the sensor output of the water level sensor 28 and to be able to accurately detect the bathtub water level. The operation is stopped, and the combustion operation control unit 43 can perform the water level detection operation by the water level sensor 28.

The pump driving section 48 stops the operation of the timer 51 when the operation of the circulation pump 20 is stopped.
It may be reset to prepare for the next timer drive, or stop, reset, and drive may be performed in order each time the hot water supply independent operation is stopped.

According to this embodiment, since the hot water supply independent operation monitoring unit 44 and the pump driving unit 48 are provided, the circulation pump 20 is operated until the predetermined pump driving time tps elapses from the time when the single hot water supply operation is completed. Can be driven. In this way, by driving the circulation pump 20 after the hot water supply alone operation, the hot water retained in the reheating steam circulation passage 24 or the hot water filling passage 25 is reheated by the reheating steam circulation passage 24.
The water temperature at the position where the water level sensor 28 is disposed can be reduced in a short time by the water level sensor 2.
It is possible to lower the temperature to 8 guaranteed temperatures.

In addition, the flow of water flowing through the reheating heat exchanger 4 driven by the circulation pump 20 removes the amount of heat retained in the reheating heat exchanger 4 heated to a high temperature by the hot water supply alone operation, and the reheating circulation passage 24. , The forcible cooling of the reheater 4 can be forcibly cooled, and the irregular vibration of the convection of the reheater 4 caused by the high-temperature heating of the reheater 4 can be suppressed for a very short time. Can be suppressed.

As described above, by driving the circulation pump 20 after the hot water supply operation alone, the water level sensor is formed by synergistically participating in the temperature dependence of the water level sensor 28 and the occurrence of the convection phenomenon of the hot water in the reheating heat exchanger 4. Irregular fluctuation of the sensor output of the water level sensor 28 can be suppressed in a short time, and the sensor output of the water level sensor 28 can be stabilized.

Also, a water level detection stop section 47 is provided to stop the water level detection operation by the water level sensor 28 during the hot water supply alone operation and until a predetermined pump drive time tps has elapsed after the hot water supply alone operation. During the period when the sensor output of the sensor 28 fluctuates irregularly due to the hot water supply alone operation, the water level detection operation by the water level sensor 28 can be stopped, and the incorrect bathtub water level due to the irregular fluctuation of the sensor output of the water level sensor 28. Can be prevented from being detected, and the problem that the appliance malfunctions based on an incorrect bathtub water level can be reliably avoided.

Further, as described above, by operating the circulation pump 20 after the hot water supply operation alone, the sensor output of the water level sensor 28 can be stabilized in a short time. This saves time.

Hereinafter, a second embodiment will be described. What is characteristic in this embodiment is that a pump drive determination unit 52 shown by a dashed line in FIG. 1 is provided so that the hot water temperature detected by the bath temperature sensor 37 during the hot water supply alone operation is equal to or higher than a predetermined threshold temperature Ts. Only when the pump drive determination unit 52 determines that the water supply has been reached, the circulation pump 20 is driven after the hot water supply alone operation. The configuration other than the data storage unit 46, the pump drive unit 48, and the pump drive determination unit 52 is the same as that of the first embodiment.
This embodiment is the same as the above-described embodiment, and redundant description of the common parts will be omitted.

By the way, there is a case where the hot water supply independent operation ends immediately after the hot water supply independent operation is started. In this case,
Since the combustion time of the burner 2 is very short, the temperature of the hot water in the reheating heat exchanger 4 does not become high. Therefore, the vibration of the hot water in the reheating heat exchanger 4 due to the convection phenomenon of the hot water occurs. Further, since the temperature of the hot water at the position where the water level sensor 28 is disposed does not become higher than the guaranteed temperature of the water level sensor 28, the sensor output of the water level sensor 28 does not fluctuate irregularly.

In such a case, a stable sensor output of the water level sensor 28 can be obtained without driving the circulation pump 20 after the hot water supply operation alone. From this,
In this embodiment, the hot water temperature detected by the bath temperature sensor 37 is taken in as the hot water temperature at the position where the water level sensor 28 is provided.
Only when the detected hot water temperature of the bath temperature sensor 37 becomes higher than the guaranteed temperature of the water level sensor 28 during the hot water supply operation alone, the circulation pump 20 is driven after the hot water operation alone, and the circulation pump 20 is circulated after the other hot water operation alone. The pump 20 was not driven.

That is, the location of the bath temperature sensor 37 is close to the location of the water level sensor 28, and the detected hot water temperature of the bath temperature sensor 37 is substantially equal to the hot water temperature of the location of the water level sensor 28. It is considered that the detected hot water temperature of the bath temperature sensor 37 (the hot water temperature at the position where the water level sensor 28 is disposed) is
8 is higher than the guaranteed temperature, the sensor output of the water level sensor 28 shifts with a large temperature dependency as described above, and the temperature of the hot water of the reheating heat exchanger 4 is extremely high. When the hot water temperature detected by the bath temperature sensor 37 is equal to or higher than the guaranteed temperature of the water level sensor 28, the circulation pump Drive 20 and reheat the recirculation passage 2
Replace the hot and cold water and reheat the heat exchanger 4
Is cooled, and the sensor output of the water level sensor 28 is stabilized.

At other times, that is, when the detected hot water temperature of the bath temperature sensor 37 is not higher than the guaranteed temperature during the hot water supply alone operation, the sensor output of the water level sensor 28 can be stabilized without driving the circulating pump 20. Can be obtained, so that the circulation pump 20
Is not driven.

The data storage section 46 stores a pump drive time tps and a predetermined threshold temperature Ts (for example, 48 ° C.). This threshold temperature Ts is determined based on the guaranteed temperature of the water level sensor 28. In this embodiment, the upper limit of the guaranteed temperature of the water level sensor 28 is stored in the data storage unit 46 as the threshold temperature Ts. I have.

The pump drive judging section 52 fetches the monitoring information of the hot water single operation monitoring section 44, and starts fetching of the hot and cold water temperature detected by the bath temperature sensor 37 when the monitoring information detects that the hot water single operation has been started. I do. At the same time, the threshold temperature Ts is read from the data storage unit 46.

The pump drive judging section 52 incorporates a timer (not shown), takes in the detected hot water temperature of the bath temperature sensor 37 at predetermined sampling time intervals, and detects the detected hot water temperature of the bath temperature sensor 37 and the threshold. Value temperature Ts (that is,
The upper limit of the guaranteed temperature of the water level sensor 28) is compared, and when it is determined that the detected hot water temperature of the bath temperature sensor 37 is equal to or higher than the threshold temperature Ts, the reheating heat exchanger is caused due to the hot water supply alone operation. It is determined that the hot water temperature of No. 4 is heated to a high temperature and the sensor output of the water level sensor 28 fluctuates irregularly. After the hot water supply alone operation, the circulation pump 20 is driven to stabilize the sensor output of the water level sensor 28 in a short time. Firing circulation passage 2
It is determined that it is necessary to replace the hot and cold water of the heat exchanger 4 and to cool the reheating heat exchanger 4, and to send a pump drive command signal for causing the pump drive unit 48 to perform a pump drive operation after the hot water supply operation alone. 48.

The pump drive section 48 starts driving the circulating pump 20 after the hot water supply alone operation only when receiving the pump drive command signal from the pump drive determination section 52 during the hot water supply alone operation.

In this embodiment, when the circulating pump 20 is not driven by the pump drive unit 48 after the hot water supply operation alone, the water level detection stop unit 47 receives the pump drive signal from the pump drive unit 48 after the hot water supply operation alone. Since there is no,
When the hot water supply independent operation is completed, the output of the water level detection stop command signal to the combustion operation control unit 43 is stopped, and the combustion operation control unit 43 ends the water level detection stop operation.

According to this embodiment, the pump drive judging section 52 is provided, and only when the detected hot water temperature detected by the bath temperature sensor 37 becomes higher than the predetermined threshold temperature Ts during the hot water supply alone operation, Since the circulating pump 20 is driven by the pump driving unit 48 after the hot water supply operation alone, the circulation pump 20 is operated after the hot water supply operation only when the sensor output of the water level sensor 28 fluctuates irregularly due to the hot water supply operation. 20 can be driven. From this,
Although it is possible to obtain a stable sensor output of the water level sensor 28, it is possible to eliminate waste of appliance operation in which the circulation pump 20 is driven after the hot water supply operation alone.

Hereinafter, a third embodiment will be described. A characteristic of this embodiment is that a time setting unit 50 is provided as shown by a dotted line in FIG.
, The pump drive time tps of the data storage unit 46 is variably set. The configuration other than the data storage unit 46 and the time setting unit 50 is the same as that of each of the above-described embodiments, and a duplicate description thereof will be omitted.

The data storage section 46 stores pump drive setting data. The pump drive setting data is provided with a pump drive time corresponding to the hot water temperature detected by the bath temperature sensor 37, and is shown in FIGS.
As shown in FIG. 7, the pump driving time is continuously or gradually increased as the hot water temperature detected by the bath temperature sensor 37 increases.

That is, as the amount of retained heat given to the reheating heat exchanger 4 by the hot water supply alone operation increases, the temperature of the retained hot water in the reheating heat exchanger 4 increases, and this reheating heat exchanger 4 The hot water of the reheating circuit 24 is heated by the heat of the hot water, and the hot water temperature detected by the bath temperature sensor 37 increases. As described above, the detected hot water temperature of the bath temperature sensor 37 corresponds to the amount of heat retained by the reheating heat exchanger 4, and as the detected hot water temperature of the bath temperature sensor 37 increases, that is, As the amount of retained heat increases, more time is required until the reheating heat exchanger 4 is cooled by driving the circulation pump 20 after the hot water supply operation alone. For this reason, in this embodiment, the pump driving time tps is variably set in a direction in which the pump driving time tps is lengthened as the hot water temperature detected by the bath temperature sensor 37 increases.

The time setting section 50 is provided with the hot water supply independent operation monitoring section 4
4 is detected, and based on this monitoring information, when it is detected that the hot water supply independent operation has ended, the bath temperature sensor 3
At the same time as taking in the hot water temperature detected by the
The pump drive setting data is read from 6 and the pump drive time is set by comparing the detected hot water temperature of the bath temperature sensor 37 with the pump drive setting data.

The set pump driving time is overwritten with the pump driving time tps stored in the data storage unit 46. The pump driving unit 48 operates when the circulation pump 20 is driven after the hot water supply operation alone. Then, the circulation pump 20 is driven until the set pump drive time tps elapses after the hot water supply independent operation is completed.

According to this embodiment, the time setting unit 50
And the pump drive time tp is variably set based on the hot water temperature detected by the bath temperature sensor 37, so that the drive time of the circulating pump 20 necessary to allow the sensor output of the water level sensor 28 to be considered. The pump drive time tps can be adjusted more accurately, for example, the pump drive time tps
Is fixed for a long time, the circulation pump 20 is uselessly driven even after the circulation of the hot and cold water necessary for stabilizing the sensor output of the water level sensor 28 is completed. Since tps is set to a short fixed time, the drive of the circulation pump 20 is stopped before the circulation of hot and cold water necessary for stabilizing the sensor output of the water level sensor 28 is completed. The postponed boiling of the accumulated hot water causes the accumulated hot water to become hot and the sensor output of the water level sensor 28 starts to fluctuate irregularly, and an incorrect bathtub water level is detected and the appliance malfunctions. Can be avoided.

As described above, the time until the sensor output of the water level sensor 28 becomes stable after the hot water supply operation alone corresponds to the amount of retained heat given to the reheating heat exchanger 4 by the hot water supply operation alone. The fluctuation range of the retained heat amount of the reheating heat exchanger 4 is predetermined, and the range of the retained heat amount is narrow.
The fluctuation range of the pump driving time required for the sensor output to stabilize is short. For this reason, even if the pump drive time tsp is fixed to a time within the range of the pump drive time, the pump drive time tps does not greatly deviate from the time until the sensor output of the water level sensor 28 stabilizes. Such problems can be substantially avoided.

The present invention is not limited to the above embodiments, but may take various embodiments. For example, in the second and third embodiments, the threshold temperature Ts is set to the upper limit of the guaranteed temperature of the water level sensor 28, but the threshold temperature Ts is set to the upper limit of the sensor output of the water level sensor 28. The water level sensor 28 is not limited to the value.
Is set based on the detected hot water temperature of the bath temperature sensor 37 that can determine whether or not the hot water temperature at the disposition position is equal to or higher than the guaranteed temperature and whether or not hot water vibration is occurring.

In the third embodiment, the pump drive setting data is stored in the form of graph data, as shown in FIG. 2, but is set to correspond to the detected hot water temperature of the bath temperature sensor 37. The pump drive setting data is configured and stored in a data format other than the graph data, such as table data to which the pump drive time is given, or arithmetic expression data for calculating the pump drive time using the bath temperature detected by the bath temperature sensor 37 as a parameter. It may be stored in the unit 46.

Further, in each of the above embodiments, the water level detection stop unit 47 stops the water level detection operation by the water level sensor 28 during the entire period in which the hot water supply alone operation is performed. The operation of detecting the water level by the water level sensor 28 may be stopped only during a predetermined part of the period in which the hot water supply operation alone is being performed.

For example, a stop threshold temperature Tst (for example, an upper limit value of the guaranteed temperature of the water level sensor 28) for determining the stop of the water level detection operation by the water level sensor 28 is determined in advance.
The water level detection stop unit 47 compares the detected temperature detected by the bath temperature sensor 37 during the hot water supply alone operation with the stop threshold temperature Tst and determines that the detected temperature of the bath temperature sensor 37 has become equal to or higher than the stop threshold temperature Tst. When determined, the water level sensor 2
8, the sensor output of the water level sensor 28 starts to fluctuate irregularly, and it is determined that the appliance may malfunction due to the irregular fluctuation of the sensor output of the water level sensor 28. May be stopped until the operation of the circulation pump 20 is stopped until the operation of the circulating pump 20 is stopped or after the hot water supply operation alone.

The period from the start of the hot water supply alone operation to the time when it is considered that the reburning heat exchanger 4 is heated by the combustion of the burner 2 and the sensor output of the water level sensor 28 starts to fluctuate irregularly depends on the time. The determined time is set in advance as a threshold time tst, and the water level detection stop unit 47 detects the sensor of the water level sensor 28 when the threshold time tst has elapsed since the single hot water supply operation was started. The output starts to fluctuate irregularly, and it is determined that the appliance may malfunction due to the irregular fluctuation of the sensor output of the water level sensor 28, and the water level detection operation by the water level sensor 28 ends the hot water supply independent operation. Or until the drive of the circulation pump 20 stops after the hot water supply operation alone.

Further, the water level detection stop section 47 does not perform the water level detection stop operation during the hot water supply alone operation, and when the circulation pump 20 is driven after the hot water supply alone operation, the operation until the circulation pump 20 stops driving is performed. Water level sensor 2 only during the period
8 may be stopped.

Further, the pump drive judging section 52 shown in each of the above embodiments judges, based on the hot water temperature detected by the bath temperature sensor 37, whether or not to drive the circulation pump 20 after the hot water supply alone operation. However, a temperature sensor separate from the bath temperature sensor 37 is provided in the reheating circulation passage 24 or the filling passage 25 near the position of the water level sensor 28, and based on the temperature of the hot water detected by the temperature sensor, It may be determined whether to drive the circulation pump 20 after the hot water supply operation alone.

Further, in the third embodiment, the time setting unit 50 sets the pump driving time by taking in the hot water temperature detected by the bath temperature sensor 37 when the hot water supply alone operation is completed. The pump driving time may be set based on the detected hot water temperature of the bath temperature sensor 37 taken during operation. For example, the bath temperature sensor 37
May be taken from time to time, and when the hot water supply independent operation ends, the pump driving time may be set based on the detected hot water temperature of the bath temperature sensor 37 immediately before the end of the hot water supply independent operation.

Further, in each of the above embodiments, the case where the hot water supply alone operation is performed during the automatic operation has been described as an example.
The present invention can be applied to a case where the hot water supply alone operation is performed during an operation mode other than the automatic operation.

Although the above embodiments have been described with reference to the appliance shown in FIG. 3, the present invention relates to a one-can-two-water-bath type water heater, in which a recirculating pump and a recirculating circulation passage are provided in the recirculating circulation passage. If a temperature sensor is provided, and a water level sensor for detecting the water level of the bathtub by water pressure is provided in the reheating circulation path or a communication path communicating with the reheating circulation path, a system configuration other than that of FIG. It can also be applied to a one-can two-channel bath water heater. For example, the present invention can also be applied to a one-can-two-channel bath water heater in which the hot water filling passage 25 shown in FIG. 3 is omitted and the water level sensor 28 is disposed in the reheating circulation passage 24. Also in this case, similarly to the above embodiments, the circulating pump 20 is driven after the hot water supply operation alone and the water level detection operation is stopped, so that the accumulated hot water in the reheating heat exchanger 4 by the hot water supply operation alone is stopped. It is possible to prevent malfunction of the appliance due to irregular fluctuation of the sensor output of the water level sensor 28 due to high temperature heating.

[0088]

According to the present invention, since the hot water single operation monitoring unit and the pump driving unit are provided, the circulation pump is driven until the predetermined pump driving time elapses after the single hot water operation is completed. Can be. In this way, by operating the circulation pump after the hot water supply alone operation, the hot water of the reheating heat exchanger and the hot water of the reheating circulation passage and the communication passage heated to a high temperature by the hot water supply alone operation can flow out to the bathtub. Thus, the temperature of the hot water at the position where the water level sensor is disposed can be reduced to the guaranteed temperature of the water level sensor in a short time.

In addition, the water flowing through the reheating heat exchanger driven by the circulation pump removes the heat of the reheating heat exchanger and flows out of the reheating circulation passage. And the vibration of hot and cold water caused by the high-temperature heating of the reheating heat exchanger can be suppressed in a short time.

From these facts, the sensor output of the water level sensor can be stabilized in a short time after the hot water supply operation alone.

Further, a water level detection stop section is provided to stop the operation of detecting the water level by the water level sensor until the driving of the circulation pump is stopped after the hot water supply operation alone, so that the water level sensor fluctuates irregularly by the hot water supply operation alone. In addition, the water level detection operation can be stopped, and an incorrect bathtub water level can be prevented from being detected by the irregularly varying sensor output of the water level sensor. Malfunction can be prevented.

In a configuration in which the circulation pump is driven after the hot water supply alone operation only when the hot water temperature detected by the reheating heating circulation passage temperature sensor becomes equal to or higher than a predetermined threshold temperature during the hot water supply alone operation, Only when it is determined that the sensor output of the water level sensor fluctuates irregularly due to the hot water supply alone operation, the circulation pump is driven after the hot water supply alone operation. When the sensor output of (1) is obtained, the circulation pump does not need to be driven after the hot water supply operation alone, so that unnecessary operation of the circulation pump can be omitted.

In the invention provided with the time setting section for variably setting the pump driving time, the pump driving time can be variably set according to the hot water temperature detected by the reheating circulation passage temperature sensor. The period until the sensor output of the water level sensor is stabilized by the circulation pump after the hot water supply operation alone can be adjusted more accurately.

Thus, the following problem can be avoided. For example, since the pump drive time is set to a long constant time, it takes time from the time required for the sensor output of the water level sensor to stabilize after the hot water supply alone operation to the end of the pump drive time, and Since the pump drive time was set to a short, fixed time, the pump drive time ended before the reheating heat exchanger was cooled, and the water flow in the reheating circulation passage was stopped. Post-boiling occurs in the accumulated hot water in the heating heat exchanger, which heats the hot water in the follow-up heat exchanger, causing the sensor output of the water level sensor to fluctuate irregularly, causing malfunctions due to irregular fluctuations in the sensor output of the water level sensor. However, as described above, it is necessary to variably set the pump drive time so as to match the period until the sensor output of the water level sensor becomes stable after the hot water supply operation alone. More, it is possible to reliably avoid a malfunction of the waste and the instrument of the instrument operation as described above.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a one-can two-water bath water heater according to the present invention.

FIG. 2 is a graph showing an example of pump drive setting data in which a pump drive time is given in accordance with a detected hot water temperature of a reheating circulation passage.

FIG. 3 is an explanatory diagram showing an example of a system configuration of a one-can-two-channel bath water heater.

FIG. 4 is a flowchart illustrating an example of an automatic driving operation.

FIG. 5 is a graph showing an example of PQ data indicating a relationship between a sensor output of a water level sensor and a bathtub water amount.

FIG. 6 is an explanatory diagram showing a conventional problem.

[Explanation of symbols]

 2 Burner 3 Hot water supply heat exchanger 4 Reheating heat exchanger 13 Water supply passage 14 Hot water supply passage 24 Reheating circulation passage 25 Filling passage 28 Water level sensor 37 Bath temperature sensor 44 Hot water supply independent operation monitoring unit 46 Data storage unit 47 Water level detection stop unit 48 Pump drive 50 Time setting

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeo Yamaguchi 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd.

Claims (3)

[Claims] 1. A hot water supply heat exchanger for heating water supplied from a water supply passage and sending it to the hot water supply passage, a circulation pump incorporated in the reheating circulation circuit of the bathtub hot water and circulating the bathtub hot water through the reheating circulation passage A reheating heat exchanger that is incorporated in the reheating circulation passage and reheats the circulating hot water circulating in the reheating circulation passage by driving the circulation pump, and a reheating circulation provided in the reheating circulation passage and detecting the hot water temperature. A passage temperature sensor, and a water level sensor disposed in the reheating steam circulation passage or a communication passage communicating with the reheating heating circulation passage and detecting a water level of hot water in the bathtub by water pressure, the above hot water supply heat exchanger and the reheating heat exchanger Are provided, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heating heat exchanger is provided. Single-water two-channel bath water heater in which the water level detection operation is performed, the single-water two-channel bath water heater monitors whether or not the single-water two-channel bath water heater is performing only the hot water supply operation without performing the additional heating operation A monitoring unit; a pump driving unit that drives the circulation pump until a predetermined pump driving time elapses after stopping the hot water supply operation alone; and a water level that stops the water level detection operation by the water level sensor until the circulation pump stops after the hot water supply operation alone. A one-stop, two-channel water heater with a detection stop portion; 2. A hot water supply heat exchanger for heating water supplied from the water supply passage and sending it to the hot water supply passage, a circulation pump incorporated in the reheating circulation passage of the bathtub hot water and circulating the bathtub hot water through the reheating combustion circulation passage. A reheating heat exchanger that is incorporated in the reheating circulation passage and reheats the circulating hot water circulating in the reheating circulation passage by driving the circulation pump, and a reheating circulation provided in the reheating circulation passage and detecting the hot water temperature. A passage temperature sensor, and a water level sensor disposed in a reheating circulation path or a communication path communicating with the reheating circulation path to detect a water level of hot water in the bathtub by water pressure, and the hot water supply heat exchanger and the reheating heat exchanger Are provided, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heating heat exchanger is provided. Single-water two-channel bath water heater in which the water level detection operation is performed, the single-water two-channel bath water heater monitors whether or not the single-water two-channel bath water heater is performing only the hot water supply operation without performing the reheating operation. A monitoring unit; circulating until a predetermined pump driving time elapses after the hot water supply alone operation is stopped when the hot water temperature detected by the additional heating circulation passage temperature sensor becomes higher than a predetermined threshold temperature during the hot water supply alone operation. A pump drive unit for driving the pump; and a water level detection stop unit for stopping the water level detection operation by the water level sensor until the circulation pump is stopped when the circulation pump is driven by the pump drive unit after the hot water supply alone operation. A one-can-two-channel water heater. 3. A time setting section for variably setting a pump driving time based on a hot or cold water temperature detected by a reheating heating circulation passage temperature sensor during the hot water supply alone operation or when the hot water supply alone operation is stopped. The one-can two-channel bath water heater according to claim 1 or 2.