JP3859867B2 - Combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion device that can recharge a bath.
[0002]
[Prior art]
FIG. 6 shows an example of a system configuration of a canned and two-channel water heater which is a combustion device developed by the applicant. In the figure, a hot water supply heat exchanger 2 for performing a hot water supply function and a reheating heat exchanger 3 for performing a reheating function are integrally provided in the appliance case 1. That is, a hot water supply side water pipe is inserted through a plurality of common fin plates 4 to form a hot water supply heat exchanger 2, and a reheating side water pipe is similarly inserted through the fin plate 4 to reheat the heat exchanger 3. It is made.
[0003]
A burner 5 that heats the hot water supply heat exchanger 2 and the reheating heat exchanger 3 in common is disposed below the integrated heat exchanger, and a combustion fan that supplies and discharges the combustion of the burner 5. 6 is arranged below the burner. A gas passage 9 is connected to the burner 5. The gas passage 9 has electromagnetic valves 7 and 8 for opening and closing the passage, and a proportional valve for controlling the gas supply amount (burner combustion heat amount) by the valve opening amount. 10 is interposed. The valve opening amount control of the proportional valve 10 is specifically performed by variable control of the current (valve opening drive current) applied to the proportional valve 10.
[0004]
A water supply pipe 11 that is a water supply passage is connected to the inlet side of the hot water supply heat exchanger 2, and a water supply temperature detection sensor 12 that detects an incoming water temperature (water supply temperature) of the hot water supply heat exchanger 2 is connected to the water supply pipe 11. And a flow rate detection sensor 13 for detecting a water supply (hot water supply) flow rate (a hot water flow rate in the case of hot water filling). The inlet side of the water supply pipe 11 is connected to a water pipe.
[0005]
A hot water supply pipe 14 serving as a hot water supply passage is connected to the outlet side of the hot water supply heat exchanger 2, and the hot water supply pipe 14 is led to a desired hot water supply place such as a kitchen via an external pipe. A hot water supply temperature sensor 15 for detecting a hot water supply temperature is provided in the flow path on the outlet side of the hot water supply heat exchanger 2.
[0006]
One end side of the pipe line 16 is connected to the inlet side of the reheating heat exchanger 3, and the other end side of the pipe line 16 is connected to the discharge side of the circulation pump 17. One end side of the return pipe 20 is connected to the suction side of the circulation pump 17, and the other end side of the return pipe 20 is connected to the bathtub 18 via a pair tube 31 (31a) which is an external pipe. The return pipe 20 is provided with a bath temperature sensor 21 which is a circulating passage water temperature detecting means for detecting the temperature of the circulating hot water in the bathtub 18 as a bath temperature, and a flow rate sensor or a flowing water sensor (flow water switch) 19 for detecting flowing water. Yes.
[0007]
One end side of the forward pipe 22 is connected to the outlet side of the reheating heat exchanger 3, and the other end side of the forward pipe 22 is connected to the bathtub 18 via a pair tube 31 (31b) which is an external pipe, The passage returning from the bathtub 18 through the pair tube 31a to the bathtub 18 through the return pipe 20, the circulation pump 17, the pipe line 16, the reheating heat exchanger 3, the forward pipe 22 and the pair tube 31b is followed by the circulation of the bath water. A fired circulation passage 23 is formed.
[0008]
The hot water supply pipe 14 of the hot water supply heat exchanger 2 and the recirculation circulation passage 23 (the pipe 16 in FIG. 6) are connected to each other by a hot water filling passage 24, and the hot water filling passage 24 is electromagnetically connected to open and close the passage. A pouring valve 25 composed of a valve or the like is interposed, and a water level sensor (pressure sensor) 26 for detecting the water level of the bathtub 18 by water pressure is provided in the hot water filling passage 24 downstream of the pouring valve 25. Yes.
[0009]
Sensor detection signals such as the flow rate detection sensor 13, the temperature sensors 12, 15, 21 and the water level sensor 26 are applied to a control device 27, and a remote control 28 is connected to the control device 27. The remote control 28 has a hot water supply temperature setting means for setting the hot water supply temperature, a bath temperature setting means for setting the bath temperature, various operation buttons for instructing hot water supply operation, automatic operation, reheating operation, hot water operation, etc. A display unit or the like for displaying various information is provided.
[0010]
The control device 27 takes in various sensor detection signals and information from the remote controller 28, and controls the hot water supply operation, the hot water filling operation, and the reheating operation as follows in accordance with a sequence program provided therein.
[0011]
For example, a flow rate detection sensor detects a flow rate equal to or higher than a predetermined hot water supply operation flow rate (for example, 2.5 liters / min) at which a tap 30 of a hot water supply passage led to a kitchen or the like is opened and a hot water supply operation can be started. When the combustion fan 6 is detected, the combustion fan 6 is rotated, the solenoid valves 7 and 8 are opened to supply fuel gas to the burner 5, and the burner is ignited by an igniter (not shown). 5 is performed, and the valve-opening drive current to the proportional valve 10 is controlled so that the hot water temperature detected by the hot water temperature sensor 15 matches the hot water set temperature set by the remote controller 28, and the hot water heat exchanger 2 The water passing through is heated by the flame of the burner 5 to produce hot water having a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply pipe 14. When the faucet 30 is closed and an off signal is output from the flow rate detection sensor 13, the burner combustion is stopped and the operation of the hot water supply operation mode is ended.
[0012]
Further, when an automatic operation mode or a hot water filling operation mode is instructed by the remote controller 28, the pouring valve 25 is opened. When the flow rate detection sensor 13 detects a flow rate that is equal to or higher than the hot water supply operating flow rate, combustion of the burner 5 is started in the same manner as in the hot water supply operation, hot water is generated by the hot water supply heat exchanger 2, and the generated hot water is generated. Passes through the hot water supply pipe 14 and the hot water filling passage 24, branches further from the pipe line 16, passes through the heat exchanger 3, passes through the outgoing pipe 22 and the hot water drops into the bathtub 18 from both sides of the path through the return pipe 20. Is included. Then, when the amount of hot water up to the set water level is dropped, or when the set water level is detected by the water level sensor 26, the pouring valve 25 is closed and the combustion of the burner 5 is stopped, and the operation of the filling operation mode is performed. Ends.
[0013]
In the reheating operation mode, the circulation pump 17 is driven to rotate while the pouring valve 25 is closed, and the hot water in the bathtub 18 is circulated through the recirculation circulation passage 23, and the bath temperature sensor 21. When the detected bath temperature is lower than the bath set temperature, the burner 5 is combusted in response to the flowing water ON signal from the flow rate sensor (running water sensor) 19, and the bath water circulating through the recirculation circulation passage 23 is chased. Heat with the soaking heat exchanger 3. When the bath temperature sensor 21 detects that the bath water temperature has reached the bath set temperature, the circulation pump 17 and the burner 5 are stopped, and the operation in the reheating operation mode is completed. .
[0014]
[Problems to be solved by the invention]
By the way, in order to prevent the accumulated hot water in the recirculation circulation passage 23 from freezing in winter or the like, the combustion equipment may be provided with the following freeze prevention function. For example, an outside air temperature sensor 32 which is an outside air temperature detecting means for detecting the outside air temperature surrounding the combustion device is provided. The outside air temperature Tg detected by the outside air temperature sensor 32 and the reheating circulation detected by the bath temperature sensor 21 are provided. The detected water temperature Th in the passage 23 is taken in every moment, the detected outside air temperature Tg falls below a set outside air temperature threshold (for example, 2 ° C.), and the detected water temperature Th in the recirculation circulation passage 23 is set. When the temperature of the circulation passage water falls below a threshold temperature (for example, 2 ° C.), it is determined that the water in the recirculation circulation passage 23 may be frozen, and the circulation pump 17 is driven to drive the recirculation circulation passage 23. The water in the inside is made to flow to prevent freezing of the water in the circulation passage 23.
[0015]
However, since the pair tube 31 is exposed to the outside, the temperature of the staying water in the pair tube 31 is such as the return pipe 20 accommodated in the instrument case 1 while the circulation pump 17 is stopped. It becomes lower than the water temperature of the recirculation circulation passage 23 portion. Since the bath temperature sensor 21 detects the water temperature of the pipe line in the appliance case 1 and cannot directly detect the water temperature in the pair tube 31, the staying water in the pair tube 31 reaches the temperature just before freezing. It is difficult to detect that the temperature has decreased based on the detection value of the bath temperature sensor 21, and the bath temperature sensor 21 is in spite of the fact that the accumulated water in the pair tube 31 has decreased to a temperature just before freezing. Since the detected water temperature is equal to or higher than the threshold temperature, the circulation pump 17 for preventing freezing is not driven, and the staying water in the pair tube 31 is frozen, and the freezing causes damage to the pipeline. There was a risk of problems.
[0016]
In particular, in the single-can two-water channel type combustion apparatus as shown in FIG. 6, the reheating heat exchanger 3 is also heated when a single hot water supply operation with only hot water is performed. The water temperature in the recirculation circulation passage 23 in the inside and in the vicinity thereof rises. On the other hand, the water temperature in the pair tube 31 hardly rises even if the hot water supply single operation is performed. The water temperature detected by the bath temperature sensor 21 does not drop below the circulation passage threshold value even though the temperature has dropped to the temperature immediately before the circulation, and therefore the circulation pump 17 does not drive and the pair tube 31 is not driven. The probability that the problem that the water inside freezes will increase.
[0017]
The present invention has been made in order to solve the above-mentioned problems, and its object is to reliably drive the circulation pump before the water in the external piping portion of the recirculation circulation passage freezes. A combustion apparatus capable of preventing freezing of water in a passage is provided.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the above-mentioned problems. That is, the first invention is a recirculation circulation passage with a circulation pump for circulating hot water in a bathtub, a circulation passage water temperature detection means for detecting a water temperature in the recirculation circulation passage, and an outside air temperature surrounding the combustion device. And an outside air temperature detecting means Satisfies at least one of a condition in which the detected water temperature in the recirculation circulation passage falls below a set threshold for the water temperature and a condition in which the detected outside air temperature falls below the set outside air temperature threshold for the outside air temperature Sometimes drive the circulation pump Antifreeze pump drive conditions and Predetermined Combustion equipment with anti-freezing function to prevent freezing of water in the recirculation circulation path by controlling the driving / stopping of the circulation pump based on the pump stop condition, and immediately after the circulation pump is driven Allowable pump standby time by combining the water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means, the outside air temperature detected by the outside air temperature detection means, and the water temperature and outside air temperature in the recirculation circulation passage. Detecting the allowable pump standby time for determining the allowable pump standby time from when the circulating pump is stopped until the circulating pump is driven before the water in the recirculation circulation path freezes, based on the data given in advance And the pump standby permissible time detected by the pump standby permissible time detection unit has elapsed since the circulating pump stopped based on the pump stop condition The anti-freezing pump drive control unit for driving the circulation pump to prevent freezing of water in the recirculation circulation path even if the anti-freezing pump driving condition is not satisfied is provided. The configuration serves as means for solving the above-described problems.
[0019]
The second invention is A recirculation passage with a circulation pump for circulating hot water in the bath, a circulation passage water temperature detection means for detecting the water temperature in the recirculation circulation passage, and an outside air temperature detection means for detecting the outside air temperature surrounding the combustion equipment. The combustion equipment is equipped with an anti-freezing function that prevents the freezing of water in the recirculation circulation path by controlling the driving / stopping of the circulation pump based on the predetermined anti-freezing pump driving conditions and pump stopping conditions. The water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means while the circulation pump is being driven or immediately after it is stopped, the outside air temperature detected by the outside air temperature detection means, and the recirculation circulation passage inside Based on the data given in advance for determining the allowable pump standby time by combining the water temperature and the outside air temperature, the water in the recirculation circulation passage is A pump standby permissible time detecting unit for obtaining a pump standby permissible time until the circulating pump is driven before being connected; detected by the pump standby permissible time detecting unit after the circulating pump is stopped based on the pump stop condition An anti-freezing pump drive control unit for driving the circulation pump to prevent freezing of the water in the recirculation circulation path when the pump standby allowable time has elapsed, even if the anti-freezing pump driving condition is not satisfied; A data storage unit for storing data of allowable pump standby time; detecting an allowable pump standby time for update at each predetermined timing while the circulating pump is stopped, and detecting the allowable pump standby time for update detected A pump standby permissible time update unit for updating the pump standby permissible time of the data storage unit to the update pump standby permissible time when the pump storage permissible time stored in the data storage unit is shorter than The antifreezing pump drive control unit is configured to perform the drive control of the circulation pump based on the allowable pump standby time stored in the data storage unit as means for solving the problem.
[0020]
According to a third aspect of the present invention, the allowable pump standby time update unit constituting the second aspect of the present invention is configured such that the water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means during the previous driving of the circulation pump or immediately after the stoppage. On the basis of the above, the configuration is such that the configuration is configured such that the pump standby allowable time for update is detected and the pump standby allowable time is updated.
[0021]
The fourth invention is: A recirculation passage with a circulation pump for circulating bath water and a circulation passage water temperature detecting means for detecting a water temperature in the recirculation circulation passage, and predetermined freeze prevention pump drive conditions and pump stop conditions Is a combustion device having an anti-freezing function for controlling the driving / stopping of the circulation pump to prevent freezing of the water in the recirculation circulation passage, and the temperature of the circulation passage water during or immediately after the circulation pump is being driven. While the circulation pump is stopped after the water temperature of the recirculation circulation passage is detected by the detection means, the circulation pump is forcibly driven at a predetermined temperature detection timing interval time, and the recirculation passage water passage is detected by the circulation passage water temperature detection means. A temperature deviation detecting unit for detecting a water temperature in the interior and detecting a deviation between the detected water temperature in the recirculation circulation passage and the water temperature in the recirculation circulation passage previously detected; Data for estimating and detecting the outside air temperature surrounding the combustion equipment is given based on the temporal temperature change of the water in the recirculation circulation passage when the pump is stopped, and the data and the temperature deviation detector detect the data. An outside air temperature estimation detecting unit for detecting and detecting the outside air temperature surrounding the combustion device based on the water temperature deviation of the recirculation circulation passage and the timing interval time of the temperature deviation detecting unit; A pump that combines the water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means, the outside air temperature estimated and detected by the outside air temperature estimation detector, the water temperature in the recirculation circulation passage, and the outside air temperature. The circulation pump before the water in the recirculation circulation passage freezes after the circulation pump stops according to the data given in advance for determining the allowable waiting time A permissible pump standby time detecting unit for obtaining a permissible pump standby time until driving; a permissible pump standby time detected by the permissible pump standby time detecting unit after the circulating pump stops based on the pump stop condition; Sometimes, even if the anti-freezing pump driving condition is not satisfied, the anti-freezing pump drive control unit for driving the circulation pump to prevent freezing of the water in the recirculation circulation path is provided. It is a means for solving the above-mentioned problems. Furthermore, a fifth invention provides the above In addition to the configuration of the second or third aspect of the invention, it is predetermined during the stop of the circulation pump while the circulation pump is being driven or immediately after the circulation pump is stopped and the water temperature of the circulation passage is detected by the circulation passage water temperature detecting means. The circulation pump is forcibly driven at the temperature detection timing interval, the water temperature in the recirculation circulation passage is detected by the circulation passage water temperature detection means, and the detected water temperature in the recirculation circulation passage and the previously detected retreat A temperature deviation detecting unit for detecting a deviation from the water temperature in the circulation passage; for estimating and detecting the outside air temperature surrounding the combustion device based on the temporal temperature change of the water in the circulation circulation passage while the circulation pump is stopped Combustion data based on the data, the water temperature deviation of the recirculation circulation path detected by the temperature deviation detector, and the timing interval time of the temperature deviation detector And an outside air temperature estimation detecting unit for estimating and detecting the outside air temperature surrounding the vessel, and the pump standby allowable time detecting unit is estimated by the outside air temperature estimating and detecting unit in place of the outside air temperature detected by the outside air temperature detecting means. The above-described problem is solved by a configuration that uses the detected outside air temperature to obtain the pump standby allowable time.
[0022]
First 6 The invention of the above 2 ~ 5 When the outside air temperature detected by the outside air temperature detecting means is lower than the set outside air temperature threshold, or when the outside air temperature is detected by the circulation passage water temperature detecting means When the water temperature in the circulation passage falls below the set circulation passage water temperature threshold, the circulation pump is forcibly driven to prevent freezing of the water in the recirculation circulation passage, assuming that the freezing prevention pump drive condition is satisfied. The anti-freezing control unit is configured to solve the problem.
[0023]
In the invention of the above configuration, for example, when the freeze pump driving conditions are satisfied and the circulation pump starts to be driven, the bath water circulates in the recirculation circulation passage. The water temperature is almost uniform. While the circulation pump is being driven or immediately after it is stopped, the outside air temperature surrounding the combustion device is detected by the outside air temperature detecting means, and the water temperature in the recirculation passage is detected by the circulating passage water temperature detecting means. As described above, since the water temperature is almost uniform over the entire area in the recirculation circulation passage, the water temperature detected by the circulation passage water temperature detection means can be regarded as the water temperature of the external piping portion of the recirculation circulation passage. It is.
[0024]
The allowable pump standby time detecting unit obtains the allowable pump standby time by a combination of the detected water temperature of the recirculation circulation passage, the detected outside air temperature of the outside air temperature detecting means, and the water temperature and the outside air temperature of the reheating circulation passage. Based on the above data, the time until the water in the external pipe falls from the detected water temperature to the temperature just before freezing is obtained as the allowable pump standby time in a state where the external pipe is exposed to the detected outside air temperature. .
[0025]
The anti-freezing pump drive control unit determines that the circulating pump does not satisfy the anti-freezing pump driving condition when the allowable pump waiting time has elapsed after the circulating pump stops based on the anti-freezing pump stop condition. Is driven to flow the water in the circulation passage to prevent freezing.
[0026]
As described above, the circulating pump is driven to cause the water in the recirculation circulation path to flow based on the allowable pump standby time in consideration of the cooling speed of the accumulated water in the external piping that is most likely to be frozen in the recirculation circulation path. Therefore, the problem that the water in the external pipe freezes can be avoided. That is, freezing of water in the recirculation circulation passage can be reliably prevented.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
[0028]
The combustion apparatus shown in the first embodiment has the system configuration of the combustion apparatus shown in FIG. 6, and the characteristic feature is that the water in the paired tube 31 that is most easily frozen in the recirculation circulation passage 23 is frozen. Is provided with a control configuration capable of reliably preventing the above. In the description of this embodiment, the description of the system configuration of the combustion equipment shown in FIG.
[0029]
In FIG. 1, a characteristic control configuration in the first embodiment is shown by a solid line. The control device 27 shown in the first embodiment includes a pump standby allowable time update unit 35, a pump standby allowable time detection unit 36, a timer 37, a data storage unit 40, and a pump drive unit, as shown by the solid line in FIG. 41, an antifreezing pump drive control unit 42, and an antifreezing control unit 43.
[0030]
The anti-freezing control unit 43 is preliminarily provided with anti-freezing pump driving conditions and pump stop conditions. The anti-freezing control unit 43 determines the water temperature Th in the recirculation circulation passage 23 detected by the bath temperature sensor 21. The outside air temperature Tg detected by the outside air temperature sensor 32 is taken in every moment, and the driving / stopping of the circulation pump 17 is controlled based on the taken-in detected values, the anti-freezing pump driving condition and the pump stopping condition. .
[0031]
In this embodiment, the following two conditions are given as the anti-freezing pump driving conditions. The first condition is when the water temperature Th in the recirculation circulation passage 23 detected by the bath temperature sensor 21 falls below a set circulation passage threshold value Thstart (for example, 8 ° C.). Is when the outside air temperature Tg detected by the outside air temperature sensor 32 is lower than a set outside air temperature threshold value Tgstart (for example, 7 ° C.).
[0032]
The circulation passage threshold value Thstart and the outside air temperature threshold value Tgstart are stored in advance in a data storage unit 40 that is a storage device. Since the detected water temperature of the bath temperature sensor 21 while the circulation pump 17 is stopped is higher than the water temperature in the pair tube 31, the outside air temperature around the combustion device is lowered to a temperature at which water is frozen. The deviation of the water temperature in the pair tube 31 with respect to the detected water temperature of the bath temperature sensor 21 when the circulation pump is stopped is obtained by experiment, calculation, etc., and this water temperature deviation is taken into consideration and the freezing in the recirculation circulation passage 23 is most easily frozen. The circulation passage threshold value Thstart for driving the circulation pump 17 before the water in the pair tube 31 is frozen is obtained and given.
[0033]
Since the outside air temperature sensor 32 is disposed in the instrument case 1, the outside air temperature detected by the outside air temperature sensor 32 is higher than the outside air temperature around the pair tube 31. A deviation of the outside air temperature around the pair tube 31 with respect to the detected outside air temperature 32 is obtained by experiment or calculation, and the outside air temperature threshold value Tgstart is obtained and given in consideration of the deviation of the outside air temperature.
[0034]
The freeze prevention control unit 43 converts the detected water temperature Th of the bath temperature sensor 21 and the detected outside air temperature Tg of the outside air temperature sensor 32 into the circulation path threshold Thstart and the outside air temperature threshold Tgstart respectively corresponding to the data storage unit 40. To determine whether or not the detected value is lower than the threshold value, and the result of the determination determines that at least one of the first condition and the second condition is satisfied. It is determined that the prevention pump drive condition is satisfied, and a drive command for circulating pump 17 is issued to pump drive unit 41. The pump drive unit 41 receives the drive command and drives the circulation pump 17. In this way, by driving the circulation pump 17, the water in the recirculation circulation passage 23 flows to prevent the water in the recirculation circulation passage 23 from freezing.
[0035]
In this embodiment, the pump stop condition is given in advance when the detected water temperature Th of the bath temperature sensor 21 rises above a set stop temperature Thstop (for example, 9 ° C.). The stop temperature Thstop is stored in advance in the data storage unit 40, and the freeze prevention control unit 43 continuously captures the detected water temperature Th of the bath temperature sensor 21 even after the circulation pump 17 is driven for freeze prevention. The detected water temperature Th is compared with the stop temperature Thstop of the data storage unit 40, and when it is determined that the detected water temperature Th of the bath temperature sensor 21 is higher than the set stop temperature Thstop, it is determined that the pump stop condition is satisfied. Then, the hot water in the bathtub recirculates in the circulation passage 23 by driving the circulation pump 17 and the bathtub hot water having a water temperature that is free from fear of freezing fills up the circulation passage 23. It is determined that there is no longer any risk of freezing, and a stop command for the circulation pump 17 is issued to the pump drive unit 41. The pump drive unit 41 receives the stop command, and the circulation pump 17 To stop.
[0036]
The pump standby permissible time detection unit 36 takes in the operation information of the anti-freezing control unit 43 from time to time, and when it detects that the driving of the circulation pump 17 by the anti-freezing control unit 43 is stopped based on the information, the circulation is detected. Just before the pump 17 is stopped, the outside air temperature Tg is detected from the outside air temperature sensor 32, and the water temperature Th in the recirculation passage 23 is detected from the bath temperature sensor 21. At this time, bath water is circulated in the recirculation circulation passage 23 by driving the circulation pump 17, and the water temperature is almost uniform throughout the recirculation circulation passage 23, and is detected by the bath temperature sensor 21. It can be considered that the water temperature is the water temperature in the pair tube 31.
[0037]
The data storage unit 40 is preliminarily given standby time detection data for obtaining the pump standby allowable time tz based on the combination of the detected water temperature Th and the detected outside air temperature Tg in the recirculation circulation passage 23. The pump standby permissible time tz is the time from when the driving of the circulation pump 17 is stopped based on the freeze prevention pump stop condition until the circulation pump 17 is driven immediately before the water in the pair tube 31 is frozen. That is. That is, in this embodiment, when the atmosphere surrounding the combustion device (pair tube 31) is the outside air temperature Tg, the water in the pair tube 31 is lowered from the water temperature Th to a temperature just before freezing (for example, 1 ° C.). The time until this is set as the pump standby allowable time tz.
[0038]
The present inventors varied the outside air temperature Tg and the cooling start water temperature Th in the pair tube 31 to obtain the temporal change in the water temperature in the pair tube 31 through experiments. FIG. 4 shows an example of the experimental result. FIG. 4 shows a change in the water temperature in the pair tube 31 for each outside air temperature when the water temperature at the start of cooling in the pair tube 31 is fixed at 40 ° C. The solid line curve L1 indicates that the outside air temperature is −20 ° C. The change over time of the water temperature in the pair tube 31 at a certain time is shown, and the solid line curve L2 shows the change over time of the water temperature in the pair tube 31 when the outside air temperature is -10 ° C. A curve L3 represents a temporal change in the water temperature in the pair tube 31 when the outside air temperature is −5 ° C., and a solid line curve L4 represents the time of the water temperature in the pair tube 31 when the outside air temperature is 0 ° C. This represents a typical change.
[0039]
Based on the experimental results as described above, the inventors allow the above-mentioned pump standby by the combination of the detected water temperature Th of the bath temperature sensor 21 detected immediately before the circulation pump 17 is stopped and the detected outside air temperature Tg of the outside air temperature sensor 32. Below for finding time tz Of The calculation formula data as shown in Formula (1) could be derived. In this embodiment, the derived arithmetic expression data is stored in the data storage unit 40 as standby time detection data.
[0040]
tz = (((Tg−α) +440) × (Th + 359) / 115) −600 (1)
[0041]
In addition ,formula Α shown in (1) indicates the outside air temperature sensor 32 for the outside air temperature surrounding the combustion device. Can It is a constant representing a temperature deviation of the detected outside air temperature Tg, and for example, a constant 8 ° C. is given in advance. Also ,formula Tg in (1) represents an outside air temperature parameter around the paired tube 31, Th represents a water temperature parameter in the paired tube 31 at the start of cooling, and the above Tg and Th are units of Celsius temperature. ,formula The pump standby allowable time tz calculated by (1) is a time unit of second.
[0042]
The allowable pump standby time detection unit 36 uses the detected water temperature Th of the bath temperature sensor 21 and the detected external air temperature Tg of the external air temperature sensor 32 taken immediately before the circulation pump 17 is stopped as described above, respectively. The allowable pump standby time tz is determined by substituting the predetermined parameter of the detection data, and the determined allowable pump standby time tz is stored in the data storage unit 40. In addition, the pump standby time detection unit 36 stores the detected water temperature Th of the bath temperature sensor 21 taken immediately before the circulation pump 17 is stopped in the data storage unit 40.
[0043]
The anti-freezing pump drive control unit 42 takes in the operation information of the anti-freezing control unit 43 from time to time, and when the anti-freezing control unit 43 determines that the driving of the circulation pump 17 is stopped based on the operation information, the timer 37 Start driving. The timer 37 measures the elapsed time after the freeze prevention pump drive is stopped.
[0044]
After starting the timer 37 as described above, the anti-freezing pump drive control unit 42 monitors the measurement time of the timer 37 and the pump standby allowance stored in the data storage unit 40 for the measurement time tc of the timer 37. Compared with the time tz, it is determined whether or not the measurement time tc has reached the pump standby allowable time tz. When the circulation pump 17 is started to be driven by the freeze prevention control unit 43 before the measurement time tc reaches the pump standby allowable time tz, the freeze prevention pump drive control unit 42 stops and resets the timer 37.
[0045]
Further, when the freeze prevention pump drive control unit 42 determines that the measurement time tc of the timer 37 has reached the allowable pump standby time tz, before the circulation pump 17 is driven by the freeze prevention control unit 43, that is, Although the anti-freezing pump driving condition is not satisfied, the water in the pair tube 31 may be lowered to a temperature just before freezing, so that the water in the pair tube 31 is circulated to prevent freezing. It is determined that the pump 17 needs to be driven, a pump drive command is issued to the pump drive unit 41, and the circulation pump 17 is forcibly driven by the pump drive unit 41. Further, the freeze prevention pump drive control unit 42 stops and resets the timer 37 after the measurement time tc of the timer 37 reaches the allowable pump standby time tz.
[0046]
After the circulation pump 17 is forcibly driven by the anti-freezing pump drive control unit 42, the anti-freezing control unit 43 performs stop control of the circulation pump 17, and immediately before the circulation pump 17 stops, As described above, the pump standby allowable time tz is detected by the pump standby allowable time detection unit 36.
[0047]
By the way, as described above, after the pump standby permissible time detection unit 36 detects the pump standby permissible time tz, the outside air temperature around the pair tube 31 decreases, and the cooling speed of the water in the pair tube 31 is increased. Sometimes. Usually, since the outside air temperature around the pair tube 31 does not drastically drop and fluctuate, the pair tube 31 can be used without changing the allowable pump standby time tz in accordance with the outside air temperature drop fluctuation. In this case, for the sake of more safety, the pump standby permissible time tz is shortened in accordance with the fluctuation in the outside air temperature while the circulation pump 17 is stopped. The control configuration is changed to
[0048]
The allowable pump standby time updating unit 35 has a built-in timer (not shown) in which a time interval for obtaining the allowable pump standby time tz ′ for updating is set. The operation information of the time detection unit 36 is taken in every moment, and based on this information, it is detected that the circulating pump 17 is stopped after the pump standby allowable time detection unit 36 detects the pump standby allowable time tz. In the meantime, the outside air temperature Tg detected by the outside air temperature sensor 32 is fetched at every timing set in the built-in timer, and the taken-in outside air temperature Tg and the circulating pump stored in the data storage unit 40 are captured. On the basis of the detected water temperature Th in the recirculation circulation passage 23 detected immediately before the stop 17 and the standby permissible time detection data, an update pump standby permissible time tz ′. To detect.
[0049]
Each time the allowable pump standby time tz ′ is detected, the allowable pump standby time tz ′ compares the allowable pump standby time tz ′ for update with the allowable pump standby time tz of the data storage unit 40, and When it is determined that the pump standby allowable time tz ′ for updating is shorter than the standby standby time tz, it is determined that the outside air temperature around the pair tube 31 has decreased, and the pump standby allowable time is accompanied by the fluctuation in the outside air temperature. It is determined that it is necessary to change tz, and the pump standby allowable time tz of the data storage unit 40 is updated to the update pump standby allowable time tz ′.
[0050]
As described above, after the pump standby allowable time tz is updated, the freeze prevention pump drive control unit 42 freezes the water in the pair tube 31 (the recirculation circulation passage 23) based on the updated pump standby allowable time tz. Take preventive action.
[0051]
The characteristic anti-freezing control configuration of the first embodiment is configured as described above, and an example of anti-freezing control operation will be described below with reference to the flowcharts of FIGS.
[0052]
First, when the reheating operation is not performed, it is determined whether or not the hot water supply operation (here, all the operations for making hot water by the hot water supply heat exchanger 2 are collectively referred to as the hot water supply operation) is stopped (step 101), when it is determined that the hot water supply operation is being performed, it waits in that state, and when it is determined that the hot water supply operation has been stopped, it is frozen by the control of the freeze prevention pump drive control unit 42 or the freeze prevention control unit 43. It is determined whether or not the prevention pump is being driven (step 102). When the timer 37 is driven when it is determined in step 101 that the hot water supply operation is being performed, the count of the timer 37 is increased by one step.
[0053]
If it is determined that the freeze prevention pump is not driven, if the timer 37 is driven, the timer 37 is incremented by one step (step 103) and the data storage unit 40 is allowed to wait for the pump. When the data of tz is stored, the count time tc of the timer 37 is compared with the allowable pump standby time tz of the data storage unit 40, and whether or not the count time tc is smaller than the allowable pump standby time tz. Is determined (step 104).
[0054]
When the timer 37 is not driven, the count-up operation in step 103 and the determination operation in step 104 are not performed. Thereafter, the water temperature Th detected by the bath temperature sensor 21 is taken in, and the taken-in detection is performed. The water temperature Th is compared with the circulation passage water temperature threshold Thstart stored in the data storage section 40, and it is determined whether or not the detected water temperature Th is lower than the circulation passage threshold Thstart (step 105). When it is determined by this determination operation that the detected water temperature Th is lower than the circulation passage threshold value Thstart, the water temperature in the recirculation circulation passage 23 is low, and the water in the recirculation circulation passage 23, particularly the pair tube 31, It is determined that the water is likely to freeze, and the freeze prevention control unit 43 starts driving the circulation pump 17 (step 106).
[0055]
After the freeze prevention pump driving is started, the operations after Step 101 are repeated, and in the determination operation of Step 102, since the freeze prevention pump is being driven as described above, the freeze prevention circulation pump 17 is operated. It is determined that the driving is performed, the detected water temperature Th of the bath temperature sensor 21 is taken in, the detected water temperature Th is compared with the pump stop temperature Thstop, and whether or not the detected water temperature Th is higher than the pump stop temperature Thstop is determined. Judgment is made (step 107). While the freeze prevention pump is being driven, the detected water temperature Th of the bath temperature sensor 21 is taken at every set time interval, and the determination operation of the above step 107 is repeated. By this determination operation, the detected water temperature Th becomes the pump stop temperature Thstop. While it is determined that it is below, the water in the recirculation circulation passage 23 may be frozen, so the circulation pump 17 is continuously driven to prevent the water in the recirculation circulation passage 23 from being frozen.
[0056]
Further, when it is determined in step 107 that the detected water temperature Th has become higher than the pump stop temperature Thstop, the bath hot water having a water temperature with no fear of freezing is filled in the entire area of the recirculation circulation passage 23. It is determined that there is no risk of water freezing in the recirculation circulation passage 23. At this time, the allowable pump standby time detector 36 detects the water temperature in the recirculation circulation passage 23 detected by the bath temperature sensor 21, that is, a pair tube. 31. The water temperature Th in 31 and the outside air temperature Tg detected by the outside air temperature sensor 32 are taken in, and the waiting time detection data stored in the data storage unit 40 are read out, and the detected values Th, Tg Based on the waiting time detection data, the water in the pair tube 31 is exposed to the outside air temperature Tg and cooled to the temperature just before freezing from the water temperature Th. The time until the lowering is calculated as the allowable pump standby time tz, and the data of the calculated allowable pump standby time tz and the data of the detected water temperature Th used to calculate the allowable pump standby time tz are stored in the data storage unit 40. Store (step 108).
[0057]
After calculating the pump standby allowable time tz, the freeze prevention control unit 43 stops driving the circulation pump 17 (step 109).
[0058]
Then, the operation after step 101 is repeated, and in the determination operation of step 102, it is determined that the freeze prevention pump driving is stopped, the count of the timer 37 is increased by one step, and the freeze prevention The measurement of the elapsed time after the pump drive stops is started.
[0059]
Next, since the data storage unit 40 stores the pump standby allowable time tz data, the determination operation in step 104 is performed. In other words, the measured time tc of the timer 37 is compared with the allowable pump standby time tz of the data storage unit 40, and it is determined whether or not the measured time tc has reached the allowable pump standby time tz. As a result of this determination, when it is determined that the measurement time tc of the timer 37 has not reached the allowable pump standby time tz, the allowable pump standby time updating unit 35 calculates the allowable pump standby time tz ′ for updating (step 110). .
[0060]
That is, the detected water temperature Th of the bath temperature sensor 21 stored in the data storage unit 40 is read, the outside air temperature Tg detected by the outside air temperature sensor 32 is taken in, and the detected values Th and Tg and the waiting time detection are detected. Based on the data, an update pump waiting allowable time tz ′ is calculated.
[0061]
Then, the pump standby allowable time tz stored in the data storage unit 40 is read, and a difference value (tz−tz ′) obtained by subtracting the calculated pump standby allowable time tz ′ from the pump standby allowable time tz. Is equal to or greater than zero, that is, it is determined whether or not the pump standby allowable time tz ′ for update is shorter than the pump standby allowable time tz (step 111), and the difference value is greater than zero. Is smaller and the pump waiting allowable time tz ′ for update is not shorter than the pump waiting allowable time tz, the outside air temperature around the pair tube 31 is the same as the outside air temperature when the pump waiting allowable time tz is detected. It is determined that there is no need to change the allowable pump standby time tz, and the operation after step 105 is repeated without updating the allowable pump standby time tz. .
[0062]
When it is determined by the determination operation in step 111 that the difference value (tz−tz ′) is not less than zero and the renewal allowable pump standby time tz ′ is shorter than the allowable pump standby time tz, the pump standby The allowable time detector 36 updates the pump standby allowable time tz of the data storage unit 40 to the update pump standby allowable time tz ′, and repeats the operations from step 105 onward.
[0063]
When it is determined in step 105 that the water temperature Th detected by the bath temperature sensor 21 is equal to or higher than the circulation passage threshold value Thstart while the circulation pump 17 is stopped, the freeze prevention pump drive control unit 42 It is determined whether or not the measurement time tc is shorter than the pump standby allowable time tz (step 113). When it is determined that the measurement time tc of the timer 37 has not reached the pump standby allowable time tz, the outside air temperature sensor 32 is further provided. The outside air temperature Tg detected by the above is taken in, and it is determined whether or not the detected outside air temperature Tg is lower than the outside air temperature threshold value Tgstart (step 114).
[0064]
When it is determined that the detected outside air temperature Tg is equal to or higher than the outside air temperature threshold value Tgstart, as described above, the pump standby allowable time tz has not elapsed since the previous driving of the circulation pump 17 was stopped, and the bath Since the detected water temperature Th of the temperature sensor 21 is not less than the circulation passage threshold value Thstart and the detected outside air temperature Tg of the outside air temperature sensor 32 is not less than the outside air temperature threshold Tgstart, the water in the recirculation circulation passage 23 is Is determined not to freeze, and the operation after step 101 is repeated while the circulation pump 17 is stopped.
[0065]
If the detected water temperature Th is determined to be lower than the circulation passage threshold value Thstart in the determination operation of step 105 while the circulation pump 17 is stopped, the water in the recirculation circulation passage 23 may be frozen. Judgment is made, and the circulation pump 17 is driven by the freeze prevention control unit 43 as described above.
[0066]
Even if it is determined that the detected water temperature Th is equal to or higher than the circulation passage threshold value Thstart by the determination operation in step 105, the circulation pump 17 is stopped based on the measurement time tc of the timer 37 in the determination operation in step 113. When it is determined that the pump standby allowable time tz has elapsed, the freeze prevention pump drive control unit 42 determines that the water in the recirculation circulation passage 23 (pair tube 31) may be frozen, and in step 106 described above. The circulation pump 17 is driven. Further, even if the detected water temperature Th is equal to or higher than the circulation passage threshold value Thstart as described above and the elapsed time Tc after the circulation pump 17 is stopped does not reach the pump standby allowable time tz, the determination operation of step 114 is performed. When it is determined that the detected outside air temperature Tg is lower than the outside air temperature threshold value Tgstart, it is determined that the water in the recirculation circulation passage 23 may be frozen, and the antifreezing control unit 43 In step 106, driving of the circulation pump 17 is started to prevent freezing of water in the recirculation circulation passage 23.
[0067]
As described above, after the anti-freezing pump drive control unit 42 or the anti-freezing control unit 43 starts driving the anti-freezing circulation pump 17, the operations after Step 101 are repeated.
[0068]
While the operation as described above is performed, the pump drive control operation as shown in the flowchart of FIG. 3 is also performed after the drive of the circulation pump 17 for preventing freezing is started.
[0069]
First, as described above, when it is determined that the water in the recirculation circulation passage 23 is likely to be frozen and the driving of the circulation pump 17 is started (step 201), the timer built in the pump drive unit 41 X (not shown) and timer Y (not shown) are reset (step 202). Thereafter, the count of the timer X is incremented by one step, and measurement of the elapsed time after the circulating pump 17 is driven is started (step 203).
[0070]
Then, based on the sensor signal of the water flow sensor 19, it is determined whether or not water flow in the recirculation circulation passage 23 by driving the circulation pump 17 is detected, and when it is determined that water flow is not detected. The reset state of the timer Y is confirmed (step 210), and whether or not the elapsed time since the circulating pump 17 is driven based on the measured time of the timer X has reached a predetermined time (for example, 10 minutes). Is determined (step 211). When it is determined that the elapsed time from the start of pump driving has not reached the predetermined time, the operation after step 203 is repeated.
[0071]
When it is determined in step 204 that the flow-on signal of the flow sensor 19 is output and the flow of the recirculation passage 23 by driving the circulation pump 17 is detected, the timer Y counts. The measurement of the elapsed time after detecting the passage of water by increasing by one step is started (step 205). Next, based on the measurement time of the timer Y, it is determined whether or not the elapsed time from the detection of water flow in the recirculation circulation passage 23 has reached a predetermined time (for example, 1 minute) (step 206). When it is determined that the elapsed time from the detection of water flow has not reached the predetermined time, the operations after step 203 are repeated.
[0072]
Then, in a state where the water flow in the recirculation circulation passage 23 is continuously detected, it is determined in the determination operation of step 206 that the elapsed time from the detection of the water flow has reached the predetermined time, When it is confirmed that water flow in the recirculation circulation passage 23 is detected (steps 207 and 212), it is determined that the bathtub hot water is stably circulating in the recirculation circulation passage 23, and the circulation pump The drive of 17 is continued.
[0073]
In this way, in the state where the circulating pump 17 is normally driven and the hot water in the bathtub is circulating in the recirculation circulation passage 23, as described above, the stop command for the circulating pump 17 is issued by the freeze prevention control unit 43. If it is determined whether or not a stop command for the circulation pump 17 has been issued, the circulation pump 17 is stopped (step 209).
[0074]
Further, when it is determined in the determination operation in step 208 that the stop command for the circulation pump 17 has not been issued, it is further determined whether or not the operation of the combustion equipment other than the anti-freezing operation is started (step 213). ) When it is determined that the operation of the combustion equipment other than the freeze prevention operation is started, the circulation pump 17 is stopped (step 209).
[0075]
If it is determined in step 211 that the elapsed time from the start of pump driving has reached the predetermined time, the recirculation circulation passage 23 is driven even if the circulation pump 17 is driven for a predetermined time. Therefore, it is determined that there is no hot water in the bathtub 18, and it is assumed that there is no water in the recirculation circulation passage 23. There is no problem of freezing, and if the idling operation of the circulation pump 17 is continued as it is, problems such as heat generation of the circulation pump 17 occur, so that the driving of the circulation pump 17 is stopped (step 209).
[0076]
As described above, after the driving of the circulation prevention pump 17 for preventing freezing is stopped, the operation after Step 101 in FIG. 2 is performed, and the freeze preventing operation is continued.
[0077]
According to this embodiment example, the time required for the water in the pair tube 31 to drop to the temperature just before freezing after the drive of the antifreezing circulation pump 17 is stopped is obtained as the allowable pump standby time tz. In addition, since the pump pump is forcibly driven when the pump standby allowable time tz has elapsed since the circulation pump 17 was stopped, the water temperature Th detected by the bath temperature sensor 21 is circulated through the circulation path. Of course, when the outside air temperature Tg detected by the outside air temperature sensor 32 is lower than the outside air temperature threshold Tgstart and the anti-freezing pump driving condition is satisfied, the anti-freezing for the air temperature sensor 32 is used. Even if the pump drive condition is not satisfied, the water temperature in the pair tube 31 is frozen based on the allowable pump standby time tz and the elapsed time since the pump stopped. When it is assumed that the temperature has decreased to the previous temperature, the circulation pump 17 can be driven. As a result, the hot water in the bathtub circulates in the recirculation circulation passage 23, and thus the recirculation circulation passage 23. It is possible to reliably avoid freezing of water in the pair tube 31 that is most easily frozen.
[0078]
In particular, in the can of two water channel type combustion equipment, as described above, when the burner 5 is combusted by the hot water supply single operation, the staying water in the reheating heat exchanger 3 is also heated, and the reheating heat exchanger 3 is heated. Since the water temperature in the vicinity of the temperature rises and the air temperature in the instrument case 1 rises, the pump drive condition is in spite of the fact that the temperature in the outer pair tube 31 is lowered to the freezing temperature. However, as shown in this embodiment, the time from when the circulation pump 17 is stopped to when the temperature in the pair tube 31 is lowered to the temperature immediately before freezing (pump standby allowance). Even if the pump drive condition is not satisfied, the time tz) is estimated and the circulating pump 17 is forcibly driven when the elapsed time from the stop of the pump reaches the pump standby allowable time tz. It is possible to reliably avoid freezing problems can water in the pair tube 31 drives the circulation pump 17 before freezing. As described above, the freezing avoidance means shown in this embodiment is a very effective means as a freezing problem avoidance means in a can-and-two-channel combustion device.
[0079]
Further, in this embodiment, after the freeze prevention pump drive is stopped, the renewal allowable pump standby time tz ′ is detected every moment, and the renewal allowable pump standby time tz ′ is determined as the permissible pump standby time. When the time is shorter than the time tz, the pump standby permissible time tz is updated to the renewed pump standby permissible time tz ′. Freezing of water in the pair tube 31, that is, the recirculation circulation passage 23 can be prevented.
[0080]
That is, when the outside air temperature around the pair tube 31 is lower than the outside air temperature around the pair tube 31 at the time when the pump standby allowable time tz is detected, the cooling speed of the water in the pair tube 31 is reduced by this drop in outside air temperature. Therefore, it is conceivable that the water in the pair tube 31 falls to a temperature just before freezing in a time shorter than the allowable pump standby time tz detected when the circulating pump 17 is stopped. In the embodiment, an update pump waiting allowable time tz ′ is detected according to the detected outside air temperature Tg of the outside air temperature sensor 32 taken in every moment, and when the outside air temperature Tg decreases, the pump standby allowable time tz is updated. Since the pump standby allowable time tz ′ is set according to the outside air temperature, the pump standby allowable time tz is set. Since the pump drive control for preventing freezing is performed based on the storage time tz and the measurement time tc of the timer 37, the water in the pair tubes 31 is frozen, that is, the recirculation circulation passage 23 regardless of the decrease in the outside air temperature. Freezing of the water inside can be avoided reliably.
[0081]
Furthermore, conventionally, the first condition is that the detected water temperature of the bath temperature sensor 21 is lower than the circulation passage threshold, and the case where the detected outside air temperature of the outside air temperature sensor 32 is lower than the circulation passage threshold. If both of the second conditions are not satisfied, the anti-freezing pump drive is not performed, but in this embodiment, one of the first condition and the second condition is satisfied. In this case, since the anti-freezing pump is driven, the anti-freezing can be more reliably prevented.
[0082]
The second embodiment will be described below. What is characteristic in the second embodiment is that the outside air temperature surrounding the combustion device is estimated and detected, and instead of the outside air temperature detected by the outside air temperature sensor 32, the pump standby allowable time is based on the estimated outside air temperature. a configuration for obtaining tz. The rest of the configuration is the same as that of the first embodiment, and redundant description of common parts is omitted.
[0083]
Incidentally, as shown in FIG. 5, the combustion device is installed indoors, but the pair tube 31 may be routed outside and connected to the bathtub 18. In such a case, it is very difficult for the outside air temperature sensor 32 provided in the instrument case 1 to detect the outside air temperature surrounding the pair tube 31, and the accumulated water in the pair tube 31 is circulated before freezing. It is difficult to accurately obtain the pump standby allowable time tz for driving the pump 17 based on the detected value of the outside air temperature sensor 32. Therefore, in this embodiment, a configuration is provided in which the outside air temperature surrounding the pair tube 31 is estimated and detected, and freezing of the accumulated water in the pair tube 31 can be reliably avoided.
[0084]
In addition to the control configuration shown in the first embodiment shown by the solid line in FIG. 1, the control device 27 shown in the second embodiment has a temperature deviation detector 44 as shown by the dotted line in FIG. And an outside air temperature estimation detection unit 45.
[0085]
As shown by the dotted line in FIG. 1, the temperature deviation detection unit 44 includes a deviation calculation unit 46, a temperature capture unit 47, and a temperature detection forced pump drive unit 48. The temperature detection forcible pump drive unit 48 has a configuration for forcibly driving the circulation pump 17 at a predetermined temperature detection timing. For example, 0:00 am assumed that bathing has been completed is set as the timing for detecting the cooling start temperature, and 4:00 am assumed that the air temperature is considerably lowered is set as the timing for detecting the comparative temperature. Data is stored in the data storage unit 40.
[0086]
When the temperature detection forcible pump drive unit 48 determines that the cooling start temperature detection timing is reached by a clock mechanism (not shown) of the remote controller 28, combustion operation such as reheating or hot water supply is performed. After confirming that there is no pump, a pump drive command is issued to the pump drive unit 41, and the pump drive unit 41 forcibly drives the circulation pump 17 for a predetermined time.
[0087]
The temperature take-in section 47 takes in the operation information of the temperature detection forced pump drive section 48 from time to time, detects that the pump drive for detecting the cooling start temperature has been started based on the information, and the bath water is recirculated. After determining that the inside has been sufficiently circulated, the temperature detected by the bath temperature sensor 21 is taken in as the water temperature in the pair tube 31 at the start of cooling, and the taken-in temperature data is stored in the data storage unit 40.
[0088]
Further, when the temperature detection forcible pump drive unit 48 determines that the time for the comparison temperature detection timing is the time of the comparison temperature detection by the clock mechanism of the remote controller 28, the circulation pump 17 is forcibly set for a predetermined time as described above. Drive. The temperature capturing unit 47 starts monitoring the detected water temperature fluctuation of the bath temperature sensor 21 when detecting that the pump driving for detecting the comparative temperature is started based on the operation information of the temperature detecting forced pump driving unit 48. While the circulation pump 17 is stopped, the temperature of the pair tube 31 in the recirculation circulation passage 23 is the lowest, so that the temperature intake unit 47 detects based on the result of monitoring the detected water temperature fluctuation. The detected water temperature Th in the region where the water temperature is the lowest is detected as the water temperature in the pair tube 31, and this detected temperature is output as a comparison temperature to the deviation calculating unit 46.
[0089]
When the deviation calculating unit 46 receives the comparison temperature data, the deviation calculation unit 46 reads out the cooling start temperature data stored in the data storage unit 40, and subtracts the comparison temperature from the cooling start temperature to obtain water in the pair tube 31. A temperature decrease deviation ΔT from the start of cooling is obtained, and data of the obtained temperature deviation ΔT is output to the outside air temperature estimation detection unit 45.
[0090]
The data storage unit 40 stores a predetermined time Δt from when the circulation pump 17 is driven at the cooling start temperature detection timing to when the circulation pump 17 is driven at the comparison temperature detection timing. And the outside air temperature estimation detection data for estimating and detecting the outside air temperature surrounding the pair tube 31 based on the temperature deviation ΔT obtained by the deviation calculating unit 46 is stored.
[0091]
Based on the temperature deviation ΔT obtained by the deviation calculation unit 46, the time Δt stored in the data storage unit 40, and the outside air temperature estimation detection data, the outside air temperature estimation detection unit 45 Estimate and detect the temperature.
[0092]
Specifically, for example, as the outside air temperature estimation detection data, data of the temporal temperature change of the staying water in the pair tube 31 for each outside air temperature as shown in FIG. When the temperature deviation ΔT is detected, when the time Δt elapses after detecting the cooling start temperature 40 ° C., the water temperature in the pair tube 31 decreases from the cooling start temperature 40 ° C. by the temperature deviation ΔT. Therefore, it is determined that the water temperature in the pair tube 31 shows the temperature change shown by the solid line curve L2 in FIG. 4, and this solid line curve L2 is the temperature change data with respect to the outside air temperature of −10 ° C. It can be determined that the outside air temperature is -10 ° C.
[0093]
In addition, although an example of the data of the temporal temperature change of the staying water in the pair tube 31 when the cooling start temperature is 40 ° C. is shown here, of course, the cooling start temperature is other than 40 ° C. As for the above, data of the temporal temperature change of the staying water in the pair tube 31 similar to the above is given.
[0094]
The outside air temperature estimation detection unit 45 outputs the outside air temperature data estimated and detected as described above to the pump standby allowable time detection unit 36.
[0095]
When receiving the estimated and detected outside air temperature, the pump standby permissible time detecting unit 36 replaces the detected outside air temperature with the outside air temperature sensor 32 and is based on the estimated and detected outside air temperature as in the first embodiment. The pump standby permissible time tz is detected, and the anti-freezing pump drive control unit 42 determines the elapsed time after the forced driving of the circulating pump 17 by the temperature detecting forced pump drive unit 48 is stopped. When the allowable pump standby time tz determined by 36 is reached, the circulation pump 17 is driven to prevent freezing of the water in the recirculation circulation passage 23, particularly the pair tube 31.
[0096]
According to this embodiment, since the configuration for estimating and detecting the outside air temperature around the pair tube 31 based on the change in the cooling temperature of the accumulated water in the pair tube 31 is provided, the outside air temperature around the pair tube 31 is substantially reduced. Since the pump standby permissible time tz can be detected based on the estimated and detected outside air temperature, the time until the accumulated water in the pair tube 31 is lowered to the temperature immediately before freezing is determined as the pump standby. The allowable time tz can be accurately obtained, and this can surely prevent the staying water in the pair tube 31 from freezing.
[0097]
In particular, as shown in FIG. 5, when the combustion device is installed indoors and the pair tube 31 is routed outside, the indoor air temperature change tendency and the outdoor air temperature change tendency by the indoor heating or the like Since it is often different and it is very difficult to detect a change in the outside air temperature around the pair tube 31 based on the detection value of the outside air temperature sensor 32, it is difficult to detect the accurate pump standby allowable time tz. However, as shown in this embodiment, the installation as shown in FIG. 5 is provided by providing a configuration for estimating and detecting the outside air temperature around the pair tube 31 using the cooling temperature change of the staying water in the pair tube 31. Even in the embodiment, the accurate pump standby allowable time tz can be detected as described above, and freezing of water in the pair tube 31 can be surely avoided.
[0098]
The present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in each of the embodiments described above, the pump standby allowable time detection unit 36 detects the water temperature in the recirculation passage 23 from the bath temperature sensor 21 immediately before stopping the circulation pump 17. If the bath water is circulated in the recirculation circulation passage 23 by driving the pump 17 and the hot water temperature is almost uniform over the entire area of the recirculation circulation passage 23, the bath temperature sensor 21 is in any state. The detected water temperature may be taken in, for example, during the driving of the circulation pump 17 after the time when it is assumed that the water temperature in the entire area of the recirculation circulation passage 23 becomes uniform after the driving of the circulation pump 17 is started. The pump standby time detection unit 36 may take in the detected water temperature of the bath temperature sensor 21, or the detected water temperature of the bath temperature sensor 21 immediately after the circulation pump 17 is stopped. It may be silicon.
[0099]
Further, in each of the above-described embodiments, the first condition and the second condition as described above are given as the pump driving condition. For example, in addition to the first and second conditions, a predetermined condition is set in advance. A condition that the circulating pump 17 is driven at a time (for example, 5:00 am when the temperature is most likely to be lowered) may be given, or the presence / absence of use of the bath is monitored, and the daily average is based on the monitoring information When a predetermined time (for example, 5 hours) has elapsed from the time when the bathing of the day is assumed to be finished based on the detected bath usage time zone, a circulating pump 17 is detected. You may give the conditions of driving. Even in such a case, when any one of a plurality of conditions given as pump driving conditions is satisfied, the circulation pump 17 is forcibly driven, and while the circulation pump 17 is being driven or immediately after it is stopped. The pump standby allowable time detection unit 36 detects the pump standby allowable time tz.
[0100]
Further, in each of the above-described embodiments, the pump standby permissible time detection unit 36 calculates the pump standby permissible time tz immediately before the freeze prevention pump drive stops. Immediately thereafter, the pump standby allowable time tz may be obtained.
[0101]
Furthermore, in each of the above-described embodiments, the allowable pump standby time tz ′ for update has been determined using the detected water temperature Th of the bath temperature sensor 21 used when determining the allowable pump standby time tz. For example, when the count of the timer 37 is decreased from the pump standby allowable time tz detected by the pump standby allowable time detection unit 36, the pump standby allowable time update unit 35 detects the water temperature detected by the bath temperature sensor 21 every moment. And the pump waiting allowable time tz ′ for update may be detected based on the detected water temperature of the bath temperature sensor 21 that has been taken in. In such a case, for example, the count time of the timer 37 is compared with the update allowable pump standby time tz ′, and it is determined that the update allowable pump standby time tz ′ is shorter than the timer 37 count time. In this case, the count time of the timer 37 is changed to the above-described pump waiting allowable time tz ′ for update.
[0102]
Further, in each of the above-described embodiments, the standby time detection data is given by arithmetic expression data. However, the pump standby permission is based on the detected water temperature Th of the bath temperature sensor 21 and the detected outside air temperature Tg of the outside air temperature sensor 32. Table data or arithmetic expression data for obtaining the time tz may be given as standby time detection data.
[0103]
Furthermore, in the second embodiment, the outside air temperature estimation detection data is composed of graph data. However, the outside air temperature estimation detection data may be composed of table data, and is detected by the deviation calculating unit 46. The calculation data for estimating and detecting the outside air temperature around the paired tubes 31 is given as the outside air temperature estimation detection data using the temperature deviation ΔT and the time Δt from when the cooling temperature is detected until the comparison temperature is detected as parameters. May be.
[0104]
Furthermore, each of the above-described embodiments has been described by taking a canned and two-water channel type hot water bath complex as an example, but the present invention may be provided with a recirculation circulation passage with a circulation pump for circulating bath water. For example, the present invention can also be applied to a two-can two-water channel hot water bath complex or a bath device having no hot water function.
[0105]
【The invention's effect】
According to the present invention, the time from when the circulation pump is stopped to when the circulation pump is driven before the water in the recirculation circulation path is frozen is obtained as the allowable pump standby time, and based on the pump stop condition for preventing freezing. Since the circulation pump is driven when the above-mentioned allowable pump waiting time has elapsed since the circulation pump stopped, the circulation pump is driven to drive up the recirculation circulation passage when the anti-freezing pump drive condition is satisfied. Of course, the above-mentioned permissible waiting time for the pump after the circulation pump stops based on the pump stop condition for freezing prevention even if the anti-freezing pump drive condition is not satisfied. When it has elapsed, detect that the water temperature in the external piping part that is most likely to freeze in the recirculation circulation passage has dropped to the temperature just before freezing. In such a case, since the circulation pump is driven, the hot water in the bathtub circulates in the recirculation circulation passage, and it is possible to reliably avoid freezing of the water in the recirculation circulation passage, particularly in the external piping portion. it can.
[0106]
While the circulating pump is stopped, the pump waiting allowable time for update is detected at every predetermined timing, and when the pump waiting allowable time for updating is shorter than the pump waiting allowable time previously detected, the pump standby allowable The system has a configuration for updating the time to the allowable pump standby time for update, and in particular, when detecting the allowable pump standby time for update, the follow-up detected during the previous circulation pump drive or immediately after it is stopped. For those with a configuration that detects the allowable pump standby time based on the water temperature of the circulating circulation passage, the outside air temperature is lower than when the allowable pump standby time is detected, and the water in the additional circulation passage is When the cooling rate of the pump increases, the pump standby time can be changed according to the change in the cooling rate. It is possible to avoid freezing of water had fired circulating passage.
[0107]
For those equipped with a configuration that estimates and detects the outside air temperature surrounding the combustion equipment, it is easy to estimate and detect the outside air temperature surrounding the external piping part of the recirculation circulation passage with the highest probability of freezing. Since the allowable pump standby time is detected based on the outside air temperature around the portion and the freeze prevention operation is performed based on the allowable pump standby time, it is possible to more reliably avoid freezing of the external pipe portion.
[0108]
When the detected outside air temperature falls below the outside air temperature threshold, or when the water temperature in the detected recirculation circulation passage falls below the circulation passage threshold, it is determined that the anti-freezing pump drive condition is satisfied. In the case of a configuration that drives the circulation pump, the detected outside air temperature is higher than the outside air temperature threshold even if the water temperature in the detection recirculation circulation passage is not lower than the circulation passage threshold. When the temperature drops, the circulation pump is driven to prevent freezing, and even if the detected outside air temperature is not lower than the outside air temperature threshold, the water temperature in the detected recirculation passage is lower than the circulation passage threshold. In this case, the circulation pump is driven to prevent freezing.
[0109]
On the other hand, for example, when the detected outside air temperature falls below the outside air temperature threshold and the water temperature in the detected recirculation circulation passage falls below the circulation passage threshold, the freeze prevention pump drive condition In the configuration in which the pump is driven to prevent freezing when it is determined that the temperature is satisfied, the detected outside air temperature and the detected water temperature in the detection circulation passage are reduced even though the water temperature in the external piping portion has decreased to a temperature that freezes. However, the circulation pump is not driven and the water in the external piping part is likely to freeze. invention Then, as described above, the circulation pump is driven when at least one of the detected outside air temperature and the water temperature in the detected circulation passage falls below the threshold value, so that the detected outside air temperature and the water temperature in the detection circulation passage are If the water in the recirculation circulation passage is considered to be frozen based on at least one, the circulation pump is driven. In addition, in the present invention, as described above, the circulation pump drive control for preventing freezing is performed based on the allowable pump standby time, so that it is possible to reliably avoid freezing of the water in the recirculation circulation passage.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram showing a characteristic control configuration in each of the above embodiments.
FIG. 2 is a flowchart showing an embodiment of an anti-freezing operation.
FIG. 3 is a flowchart showing an example of a drive control operation of the circulation pump in the freeze prevention operation.
FIG. 4 is a graph showing an example of a temporal cooling temperature change of staying water in a pair tube.
FIG. 5 is an explanatory view showing an arrangement example of a combustion device and a bathtub.
FIG. 6 is a model diagram showing an example of a combustion device.
[Explanation of symbols]
3 Reheating heat exchanger
17 Circulation pump
18 Bathtub
21 Bath temperature sensor
23 Recirculation circulation passage
31 pair tubes
32 Outside air temperature sensor
35 Pump waiting time update section
36 Pump standby time detection unit
40 Data storage
42 Antifreeze pump drive controller
43 Anti-freezing control unit
44 Temperature deviation detector
45 Outside air temperature estimation detector

Claims (6)

A recirculation passage with a circulation pump for circulating hot water in the bath, a circulation passage water temperature detection means for detecting the water temperature in the recirculation circulation passage, and an outside air temperature detection means for detecting the outside air temperature surrounding the combustion equipment. And at least one of a condition in which the detected water temperature in the recirculation circulation passage falls below a set threshold value for the water temperature and a condition in which the detected outside air temperature falls below a set outside temperature threshold value for the outside air temperature. Anti-freezing function that prevents the freezing of water in the recirculation circulation path by controlling the driving / stopping of the circulation pump based on the pump driving conditions for anti-freezing that drives the circulation pump when satisfied and the predetermined pump stop conditions A combustion device comprising: a water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means while the circulation pump is being driven or immediately after the circulation pump is stopped; After the circulation pump is stopped, the additional temperature is detected by the outside air temperature detected by the temperature detecting means and the preliminarily given data for determining the allowable pump standby time by combining the water temperature and the outside air temperature in the recirculation circulation passage. A permissible pump standby time detecting unit for obtaining a permissible pump standby time until the circulating pump is driven before the water in the circulating circulation path freezes; the permissible pump standby after the circulating pump stops based on the pump stop condition; Freezing that prevents the freezing of the water in the recirculation circulation path by driving the circulation pump when the pump standby allowable time detected by the time detection unit has elapsed even if the anti-freezing pump driving condition is not satisfied And a prevention pump drive control unit. A recirculation passage with a circulation pump for circulating hot water in the bath, a circulation passage water temperature detection means for detecting the water temperature in the recirculation circulation passage, and an outside air temperature detection means for detecting the outside air temperature surrounding the combustion equipment. The combustion equipment is equipped with an anti-freezing function that prevents the freezing of water in the recirculation circulation path by controlling the driving / stopping of the circulation pump based on the predetermined anti-freezing pump driving conditions and pump stopping conditions. The water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means while the circulation pump is being driven or immediately after it is stopped, the outside air temperature detected by the outside air temperature detection means, and the recirculation circulation passage inside Based on the data given in advance for determining the allowable pump standby time by combining the water temperature and the outside air temperature, the water in the recirculation circulation passage is A pump standby permissible time detecting unit for obtaining a pump standby permissible time until the circulating pump is driven before being connected; detected by the pump standby permissible time detecting unit after the circulating pump is stopped based on the pump stop condition An anti-freezing pump drive control unit for driving the circulation pump to prevent freezing of the water in the recirculation circulation path when the pump standby allowable time has elapsed, even if the anti-freezing pump driving condition is not satisfied; A data storage unit for storing data of allowable pump standby time; detecting an allowable pump standby time for update at each predetermined timing while the circulating pump is stopped, and detecting the allowable pump standby time for update detected Is shorter than the allowable pump standby time stored in the data storage unit, the allowable pump standby time of the data storage unit is set to the update poWer. And a pump standby permissible time update unit that updates to a permissible pump standby time, and the anti-freezing pump drive control unit performs drive control of the circulation pump based on the pump standby permissible time stored in the data storage unit. combustion equipment shall be the feature that the configuration and the.   The allowable pump standby time update unit detects the allowable pump standby time based on the water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means during the previous driving of the circulation pump or immediately after the circulation pump is stopped. The combustion apparatus according to claim 2, wherein the pump standby allowable time is updated. A recirculation passage with a circulation pump for circulating bath water and a circulation passage water temperature detecting means for detecting a water temperature in the recirculation circulation passage, and predetermined freeze prevention pump drive conditions and pump stop conditions Is a combustion device having an anti-freezing function for controlling the driving / stopping of the circulation pump to prevent freezing of the water in the recirculation circulation passage, and the temperature of the circulation passage water during or immediately after the circulation pump is being driven. While the circulation pump is stopped after the water temperature of the recirculation circulation passage is detected by the detection means, the circulation pump is forcibly driven at a predetermined temperature detection timing interval time, and the recirculation passage water passage is detected by the circulation passage water temperature detection means. A temperature deviation detecting unit for detecting a water temperature in the interior and detecting a deviation between the detected water temperature in the recirculation circulation passage and the water temperature in the recirculation circulation passage previously detected; Data for estimating and detecting the outside air temperature surrounding the combustion equipment is given based on the temporal temperature change of the water in the recirculation circulation passage when the pump is stopped, and the data and the temperature deviation detector detect the data. follow the temperature deviation fired circulation passage that, on the basis of said temperature deviation timing interval detection unit time, and the outside air temperature estimated detection unit that estimates detecting an outside air temperature surrounding the burning appliance; immediately after driving in or stopping its circulation pump A pump that combines the water temperature in the recirculation circulation passage detected by the circulation passage water temperature detection means, the outside air temperature estimated and detected by the outside air temperature estimation detector, the water temperature in the recirculation circulation passage, and the outside air temperature. The circulation pump before the water in the recirculation circulation passage freezes after the circulation pump stops according to the data given in advance for determining the allowable waiting time A permissible pump standby time detecting unit for obtaining a permissible pump standby time until driving; a permissible pump standby time detected by the permissible pump standby time detecting unit after the circulating pump stops based on the pump stop condition; In some cases, an anti-freezing pump drive control unit for driving the circulation pump to prevent freezing of water in the recirculation circulation path even if the anti-freezing pump driving condition is not satisfied is provided. combustion equipment shall be the feature. While the circulation pump is being driven or immediately after the circulation pump is stopped, the circulation passage water temperature detecting means detects the water temperature in the circulation passage, and during the stop of the circulation pump, the circulation pump is forcibly forced at a predetermined temperature detection timing interval time. The temperature deviation is detected by detecting the water temperature in the recirculation circulation passage by driving the circulation passage water temperature detecting means and detecting the deviation between the detected water temperature in the recirculation circulation passage and the water temperature in the recirculation circulation passage detected last time. A detection unit; and data for estimating and detecting an outside air temperature surrounding the combustion device based on a temporal temperature change of water in the recirculation circulation passage when the circulation pump is stopped, the data and the temperature deviation Based on the water temperature deviation of the recirculation circulation path detected by the detection unit and the timing interval time of the temperature deviation detection unit, the ambient temperature surrounding the combustion device is estimated and detected. An air temperature estimation detection unit; and a pump standby allowable time detection unit, using the outside air temperature estimated and detected by the outside air temperature estimation detection unit, instead of the outside air temperature detection means detected by the outside air temperature detection means, burning appliance 請 Motomeko 2 or claim 3, wherein you, characterized in that it forms a structure for obtaining the pump standby allowable time. When the outside air temperature detected by the outside air temperature detecting means falls below the set outside air temperature threshold or when the water temperature of the recirculation circulation passage detected by the circulating passage water temperature detecting means is the set circulation passage water temperature threshold The anti-freezing control unit is provided to prevent the freezing of the water in the recirculation passage by forcibly driving the circulating pump when the anti-freezing pump driving condition is satisfied A combustion device according to any one of claims 2 to 5 .

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