JP3859831B2 - 1 can 2 water channel hot water bath - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a heat exchanger for transferring heat from a burner to both water in a reheating channel through which water in a bathtub circulates and water in a hot water supply channel through which water is supplied, and the water in the bathtub is replenished. The present invention relates to a one-can two-water channel hot water bath provided with a circulation pump that circulates through a watering channel.
[0002]
[Prior art]
Conventionally used 1-can 2-water-type hot water baths are equipped with a circulation pump that circulates the water in the bathtub through a reheating channel that passes through a heat exchanger. The burner is ignited and the circulation pump is driven. Further, when the hot water supply single operation or the reheating single operation is shifted to the simultaneous operation of hot water supply and reheating, the circulation pump is driven with a predetermined rated capacity.
[0003]
[Problems to be solved by the invention]
However, in a 1-can 2-water-type hot water bath, the heat generated by the burner is absorbed by both the reheating channel side and the hot water flow channel side when hot water and reheating of the bath are operated simultaneously. When driving at a constant capacity, there is a problem that hot water having a set temperature cannot be discharged from the hot water supply side by a required amount even when the burner is burned at maximum.
[0004]
The present invention has been made paying attention to such problems of the prior art, and even when hot water supply and bath reheating are simultaneously operated, only the required amount of hot water at a set temperature is supplied from the hot water supply side. An object of the present invention is to provide a one-can, two-channel hot-water hot water bath that can take out hot water.
[0006]
[Means for Solving the Problems]
  The gist of the present invention for achieving the object lies in the inventions of the following items.
[1]Heat exchanger (13) for transferring heat from the burner (12) to both the water in the reheating channel (31) through which water in the bathtub (40) circulates and the water in the hot water supply channel (21) through which the water is supplied. ) And a circulation pump (32) that circulates water in the bathtub (40) through the reheating channel (31),
  A hot water temperature detection means (29) for detecting the temperature of hot water discharged through the hot water supply passage (21), and a circulation pump control means (51, 32a) for controlling the amount of circulating water by the circulation pump (32),
  The circulating pump control means (51, 32a) is configured to set the hot water supply temperature based on the hot water temperature detected by the hot water temperature detection means (29) when hot water supply and bathing are simultaneously used. Increase or decrease the amount of circulating water by the circulation pump (32) so as to reach a temperature,
  When shifting from hot water supply single operation or reheating single operation to simultaneous operation of hot water supply and reheating, the circulating water amount by the circulation pump (32) is temporarily set to a predetermined minimum flow rate, and then, depending on the hot water temperature on the hot water supply side The circulating water volume is increased or decreased.1Can 2 water channel hot water bath(10).
[0007]
[2] Heat exchange for transferring heat from the burner (12) to both the water in the reheating channel (31) through which water in the bathtub (40) circulates and the water in the hot water supply channel (21) through which the water is supplied In a one-can two-water-type hot water hot water bath (10) comprising a vessel (13) and a circulation pump (32) for circulating water in the bathtub (40) through the reheating channel (31),
  A hot water temperature detection means (29) for detecting the temperature of hot water discharged through the hot water supply passage (21), and a circulation pump control means (51, 32a) for controlling the amount of circulating water by the circulation pump (32),
  The circulating pump control means (51, 32a) is configured to set the hot water supply temperature based on the hot water temperature detected by the hot water temperature detection means (29) when hot water supply and bathing are simultaneously used. The circulating water amount by the circulation pump (32) is increased or decreased so as to reach a temperature, and when the required amount of hot water is discharged at the hot water supply temperature on the hot water supply side, the circulating water amount is increased and the burner (12) is burned to the maximum. However, when the required amount of hot water is no longer discharged to the hot water supply side at the hot water supply set temperature, the circulating water amount is reduced.
[3] The circulating pump control means (51, 32a) may increase the circulating water amount when the required amount of hot water is discharged at the hot water supply side to the hot water supply side, and the burner (12) may be burned to the maximum. When the required amount of hot water is no longer discharged at the hot water supply set temperature on the hot water supply side, the circulating water amount is reduced [1.]Record1 can 2 water channel hot water bath(10).
[0008]
[4]Heat exchanger (13) for transferring heat from the burner (12) to both the water in the reheating channel (31) through which water in the bathtub (40) circulates and the water in the hot water supply channel (21) through which the water is supplied. ) And a circulation pump (32) that circulates water in the bathtub (40) through the reheating channel (31),
  A hot water temperature detection means (29) for detecting the temperature of hot water discharged through the hot water supply passage (21), and a circulation pump control means (51, 32a) for controlling the amount of circulating water by the circulation pump (32),
  The circulating pump control means (51, 32a) is configured to set the hot water supply temperature based on the hot water temperature detected by the hot water temperature detection means (29) when hot water supply and bathing are simultaneously used. Increase or decrease the amount of circulating water by the circulation pump (32) so as to reach a temperature,When the required amount of hot water is no longer discharged to the hot water supply side at the hot water supply set temperature even when the circulation flow rate is limited to the preset minimum flow rate under the state where the burner (12) is maximally burning, the circulation is performed. The pump (32) is stopped and the chasing operation is temporarily stopped.1Can 2 water channel hot water bath(10).
[5] The circulating pump control means (51, 32a) is a required amount to the hot water supply side even if the circulating flow rate is limited to a preset minimum flow rate in a state where the burner (12) is burning maximum. [1], [2] or [3], wherein when the hot water is no longer discharged at the hot water supply set temperature, the circulation pump (32) is stopped and the reheating operation is temporarily stopped. Can 2 water channel hot water bath (10).
[0009]
The present invention operates as follows.
When the hot water supply and the reheating of the bath are used at the same time, the circulation pump control means (51, 32a) sets the temperature to the hot water supply set temperature based on the hot water temperature detected by the hot water temperature detection means (29). Increase or decrease the amount of circulating water by the circulation pump (32). For example, when the hot water temperature becomes lower than the set temperature, the amount of circulating water is decreased, the amount of heat absorbed by the reheating side is decreased, and the heating amount on the hot water supply side is relatively increased. Thereby, the tapping temperature can be raised toward the set temperature.
[0010]
  AndWhen the hot water supply single operation or the reheating single operation is shifted to the simultaneous operation of the hot water supply and reheating, the circulating water amount by the circulation pump (32) is temporarily set to a predetermined minimum flow rate, and then the hot water temperature on the hot water supply side is set. Increase or decrease the amount of circulating water. When the operation is shifted to the simultaneous operation, since the heat absorption amount on the reheating side is once set to be small, the hot water supply side is given priority from the beginning, and the temperature of the discharged hot water does not decrease at the start of the simultaneous operation.
[0011]
Further, even when the refueling single operation is shifted to the simultaneous operation, the circulating water amount is controlled to the minimum flow rate once and then the circulating water amount is controlled based on the tapping temperature. Control can be made common when shifting from operation to simultaneous operation and when shifting from single operation to simultaneous operation, which can be simplified.
[0012]
The circulation pump control means (51, 32a) is configured to follow up when the required amount of hot water is discharged to the hot water supply side at the hot water supply set temperature, that is, when the hot water supply is being performed and the combustion capacity is still sufficient. Increase the amount of circulating water on the burning side. On the other hand, when the required amount of hot water is no longer discharged to the hot water supply side at the hot water supply set temperature even when the burner (12) is maximally burned, that is, it is necessary to preferentially distribute the heat from the burner (12) by the hot water supply side. At some point, reduce the amount of circulating water on the catcher side. As a result, the time required for reheating within a range that does not hinder the hot water supply side can be shortened to the maximum.
[0013]
Further, the circulation pump control means (51, 32a) can supply the required amount of hot water to the hot water supply side at the hot water supply set temperature even if the circulation flow rate is limited to a predetermined minimum flow rate in a state where the burner (12) is in maximum combustion. When hot water is no longer discharged, the circulation pump (32) is stopped and the chasing operation is temporarily stopped. Thereby, the hot water supply side can be heated further preferentially.
[0014]
In addition, by controlling the circulating water amount by feedback control based on the tapping temperature as described above, for example, the margin of the number is obtained based on the water supply temperature, the hot water supply set temperature, and the hot water supply side water flow amount. Compared to feed-forward control that sets the circulating water volume based on the bath-side incoming temperature and the bath-side set temperature, there is no calculation error, and the required amount of hot water is reliably discharged at the hot-water supply set temperature. The maximum amount of circulating water can be increased within the range.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Each figure shows an embodiment of the present invention.
1 can 2 water channel type hot water bath 10 according to the present invention has a function of supplying hot water to a faucet or pouring hot water into a bathtub 40, a function of replenishing hot water in a bathtub, and the like. As shown in FIG. 1, a single can / two water channel hot water bath 10 includes a combustion chamber 11. A burner 12 is provided at the lower portion of the combustion chamber 11, and a burner 12 is provided at the upper portion of the combustion chamber 11. The heat exchangers 13 for transferring the heat to the water supply or the like are respectively disposed.
[0016]
The heat exchanger 13 passes through both a hot water supply pipe 21 for flowing hot water or pouring water and a recirculation pipe 31 for circulating water in the bathtub for reheating. The vessel 13 has a function of transferring the heat from the burner 12 to the fluid in both the pipes 21 and 31 and heating it.
[0017]
A fixed bypass path 22 and a flow rate control valve are provided between a water supply side flow path 21 a toward the inlet side of the heat exchanger 13 and a hot water supply side path 21 b extending from the outlet side of the heat exchanger 13 in the hot water supply pipe 21. A bypass path 24 in which (GM1) 23 is inserted is connected. The hot water heated by the heat exchanger 13 is mixed with the feed water through the fixed bypass passage 22 and the bypass passage 24, and the bypass ratio can be controlled by the flow control valve 23. In addition, a flow rate control valve (GM2) 25 for controlling the total flow rate and bypass ratio of the hot water is provided on the hot water supply side channel 21b side of the hot water supply pipe 21.
[0018]
Flow sensors 26a and 26b for detecting the presence / absence of water flow and the amount of water flow are provided in the vicinity of the inlet and outlet of the hot water supply pipe 21, respectively. Also, a water thermistor 27 for detecting the temperature of the water supply (Tin) is detected near the inlet of the hot water supply pipe 21, and the hot water temperature (Tout) after heating is detected near the outlet of the heat exchanger 13. A hot water thermistor 28 for detecting the hot water temperature (Tmix) is attached in the vicinity of the outlet of the hot water supply pipe 21.
[0019]
The recirculation circulation pipe 31 includes a bath return pipe portion 31 a that returns the water in the bathtub 40 to the heat exchanger 13, and a bath return pipe portion 31 b that sends hot water heated by the heat exchanger 13 to the bathtub 40. Composed. In the middle of the bath return pipe portion 31a, a circulation pump 32 and a bath running water switch 33 for detecting the presence or absence of water flow in the bath return pipe portion 31a are provided. A bath temperature thermistor 34 for detecting the temperature of hot water flowing from the bathtub 40 side is attached in the vicinity of the bath water switch 33.
[0020]
The hot water supply side pipe 21b of the hot water supply pipe 21 and the bath return pipe portion 31a are connected by a pouring pipe 36 having a pouring solenoid valve 35, and the hot water supplied by the heat exchanger 13 is poured. Hot water can be poured into the bathtub 40 through the pipe 36.
[0021]
The supply / exhaust is forcibly performed by blowing the supply air from the lower side of the combustion chamber 11 by the combustion fan 14, and the exhaust is discharged from the upper part of the combustion chamber 11. An ignition device 15 not shown in FIG. 1 is provided in the vicinity of the burner 12. The combustion gas supplied to the burner 12 is on / off controlled by the gas solenoid valve 16, the original gas solenoid valve 17, and the gas switching valve 18. Further, the amount of combustion gas supplied to the burner 12 is adjusted by a gas proportional valve 19. The opening degree of the gas proportional valve 19 is controlled by the proportional valve current (i) supplied thereto.
[0022]
FIG. 2 shows the circuit configuration of the control base of the single can / two water channel hot water bath 10. This control board includes a CPU (Central Processing Unit) 51 that performs a central function of various controls. Various circuit devices are connected to the CPU 51 via various buses 52 such as a data bus and an address bus.
[0023]
Among these, a ROM (Read Only Memory) 53 is a read only memory for storing a program executed by the CPU 51 and various kinds of fixed data. A RAM (Random Access Memory) 54 is a working memory for storing data that is temporarily required for executing a program.
[0024]
In addition to the main body operation unit 55, an input / output interface circuit unit 56 for inputting / outputting electric signals between various circuit devices and the CPU 51 is connected to the bus 52. Although not shown, in addition to the main body operation unit 55, a main remote controller and a bath remote controller are also connected. The input / output interface circuit unit 56 includes flow sensors 26a and 26b, various thermistors 27 to 29, 34, an ignition device 15, a combustion fan 14, various gas control valves 16 to 19, and flow control valves 23 and 25, and a pouring electromagnetic valve. A pump drive circuit 32a for driving the valve 35 and the circulation pump 32 is connected. In addition, various control devices are connected to the input / output interface circuit unit 56 as necessary.
[0025]
Next, the operation will be described.
The single can / two water channel hot water bath 10 according to the present embodiment is provided with a circulation pump 32 so that when a hot water supply and a reheating are operated simultaneously, a required amount of hot water at a hot water supply set temperature (Tsp) can be discharged. The amount of circulating water on the side of the recirculation pipe 31 is adjusted. That is, in the case of simultaneous operation, the hot water supply side is prioritized over the reheating side, and the heat absorption amount on the reheating side is adjusted so as not to interfere with the hot water. Here, the required amount is the amount of hot water discharged according to the opening degree of the tap at the hot water outlet, and actually refers to the amount of hot water in a state where the amount of hot water is not limited by the flow rate control valve (GM2) 25.
[0026]
As shown in FIG. 3, when the hot water supply single operation or the reheating single operation state (step S101) is changed to the simultaneous operation state (step S102; Y), first, the flow control valve (GM2) 25 is fully opened. Whether or not (step S103). When the burner 12 is burned with the maximum capacity (input) and the hot water at the hot water supply set temperature cannot be discharged, the flow control valve (GM2) 25 is throttled to prioritize the discharged water temperature over the amount of discharged water. Yes. Therefore, when the flow control valve (GM2) 25 is not in the fully open state, the hot water at the hot water supply set temperature cannot be discharged by the required amount even though the burner 12 is already burned with the maximum input.
[0027]
In the case of a single can / two water channel type, the heat from the burner 12 is absorbed by the flow path on both the reheating side and the hot water supply side, so if the amount of circulating water on the reheating side increases, the heat absorption on the reheating side increases. The heat absorption amount on the hot water supply side is relatively reduced. Therefore, when the flow rate control valve (GM2) 25 is not fully opened (step S103; N), the reheating operation is interrupted to return to the hot water supply single operation (to step S101), and the hot water supply side is given priority.
[0028]
When the flow rate control valve (GM2) 25 is fully open (step S103; Y), since the required amount of hot water at the hot water supply set temperature is discharged, there is a possibility that the burner 12 still has room for combustion. Therefore, it is determined that in addition to hot water supply, reheating can be performed in parallel, and the circulation pump 32 is operated with an appropriate amount of circulating water (step S104). Thereafter, while the circulation pump 32 is operated and the reheating operation is performed in parallel with the hot water supply operation, the hot water temperature detected by the hot water thermistor 29 is monitored. Then, when the hot water supply set temperature is equal to the hot water supply temperature or the hot water supply temperature is higher than the hot water supply set temperature (step S105; N), it is determined that there is still an allowance in the combustion amount, and the circulating water amount by the circulation pump 32 is a predetermined amount (Δq). (Step S106).
[0029]
On the other hand, when the tapping temperature is lower than the hot water supply set temperature (step S105; Y), first, it is confirmed whether or not the burner 12 is combusting with the maximum input (step S107). Step S107; N), the input is increased (Step S108). When the burner 12 is combusting with the maximum input (step S107; Y), in order to increase the heat absorption amount on the hot water supply side, the amount of circulating water by the circulation pump 32 is decreased by a predetermined amount (step S110). When the circulating water amount has already been reduced to the preset minimum value (step S109; Y), the chasing operation is interrupted and returned to the hot water supply single operation (to step S101).
[0030]
In this way, the hot water temperature is monitored and the amount of circulating water on the reheating side is increased / decreased by feedback control so that it does not fall below the preset hot water supply temperature, so even during simultaneous operation of hot water supply and reheating, It does not cause a decrease or a decrease in hot water temperature.
[0031]
In addition, feedback control based on the hot water temperature is used, so that the amount of circulating water on the reheating side can be increased to the maximum within the range where hot water at the hot water supply set temperature can be discharged by the required amount (a range that does not interfere with the hot water supply side). This can shorten the time it takes to chase.
[0032]
Further, if the circulating water amount is limited to the minimum flow rate, the reheating operation is interrupted when the demand on the hot water supply side cannot be satisfied. For example, the circulating pump 32 is driven below the minimum operable power and deteriorated. Absent.
[0033]
4 and 5 show the operation shown in FIG. 3 in more detail. Here, the single can / two water channel hot water bath 10 has a plurality of state modes, and the operation immediately after the start of the simultaneous operation differs depending on what state mode the simultaneous operation is reached.
[0034]
There are mode 1 to mode 4 in the state mode of the 1 can 2 water channel hot water bath 10. Of these, mode 4 is a state in which the operation is stopped. Mode 1 is a state in which hot hot water may stop in the heat exchanger 13 portion of the hot water supply pipe 21, for example, when there is no hot water supply operation and a reheating operation is performed, or a reheating operation is performed alone. This is the case when the hot water supply operation has not yet been performed after the operation is completed.
[0035]
When hot water is started from the state of Mode 1 to the hot water supply side, hot water having a temperature higher than the hot water supply temperature may be discharged. Therefore, in Mode 1, the flow rate control valve (GM1) 23 is set to a predetermined opening, When the hot water is started, a state in which a large amount of low-temperature water is mixed through the bypass 24 from the beginning of hot water is prevented, and hot water is prevented from coming out.
[0036]
Mode 3 corresponds to a period in which the flow rate control valve (GM1) 23, which has been waiting at a predetermined opening in order to lower the hot water temperature, is gradually closed immediately after the hot water is started from mode 1. Mode 2 is a state in which the flow control valve (GM1) 23 has been closed. This state corresponds to, for example, a state before the reheating operation is performed after the hot water supply independent operation, the simultaneous operation of the hot water supply and the reheating, or after the hot water supply independent operation is stopped. The transition from mode 2 to mode 1 is performed when the hot water supply operation is stopped from the simultaneous operation (that is, when the reheating operation is performed alone) or when the reheating operation is started from the hot water supply stop state.
[0037]
FIG. 4 shows the flow of operation when shifting to simultaneous operation from hot water supply single operation (mode 2 or mode 3). When a bath automatic operation switch or the like is pressed in the state of hot water supply single operation (step S201) and there is a reheating instruction (bath interruption) (step S202; Y), when the current state mode is mode 3, mode 2 (Step S203; N). Since mode 3 is a period in which the flow control valve (GM1) 23 is gradually closed, the tapping temperature is not stable. Therefore, after the closing of the flow rate control valve (GM1) 23 is completed and the state of the mode 2 is reached, the reheating operation (control of the circulating water amount) is started.
[0038]
In the mode 2 state (step S203; Y), it is checked whether or not the flow control valve (GM2) 25 is fully opened (step S204). When it is not fully open (step S204; Y), even if the burner 12 is burned with the maximum capacity (input), the hot water at the hot water supply set temperature is already in a state where the required amount cannot be discharged, so the shift to the simultaneous operation is stopped. Then, the hot water supply is kept alone (to step S201).
[0039]
When the flow rate control valve (GM2) 25 is fully open (step S204; N), the circulating water amount of the circulation pump 32 is set to a predetermined minimum flow rate (qmin) and the reheating operation is started (step S205). . When the operation of the circulation pump 32 is started and the tapping temperature (Tmix) becomes lower than the hot water supply set temperature (Tsp) (step S206; Y), the proportional valve current (i) is the maximum allowable proportional valve current (imax). Whether or not the input to the burner 12 is the maximum value (step S207). If the input is not the maximum value, the proportional valve current (i) is increased by Δi to try to raise the tapping temperature (Tmix). (Step S208). When the proportional valve current (i) is already the maximum allowable proportional valve current (imax), the circulation pump 32 is stopped (step S209), and the chasing operation is interrupted (to step S201).
[0040]
If the hot water temperature (Tmix) does not fall below the hot water supply set temperature (Tsp) even when the circulating pump 32 is driven at the minimum flow rate (qmin) (step S206; N), it is determined that there is still a margin in the combustion capacity. The circulating water amount of the circulation pump 32 is increased by Δq (step S210). Thereafter, the hot water temperature (Tmix) is further monitored (step S211). While the hot water temperature (Tmix) is not lower than the hot water supply set temperature (Tsp) (step S211; N), the maximum flow rate (qmax) of the circulation pump 32 is set. The amount of circulating water is increased by Δq until it reaches (step S212, step S213).
[0041]
When the hot water temperature (Tmix) becomes lower than the hot water supply set temperature (Tsp) (step S211; Y), it is checked whether the proportional valve current (i) has already reached the maximum value (imax) (step S214). When it is not the value (imax) (step S214; Y), the proportional valve current (i) is increased by Δi and the hot water temperature (Tmix) is increased (step S215).
[0042]
On the other hand, if the proportional valve current is already at the maximum value (imax), the amount of circulating water in the circulation pump 32 is decreased by Δq (step S217). However, when the circulating water amount has already been reduced to the minimum flow rate (qmin) (step S216; N), the circulation pump 32 is stopped (step S209), and the reheating operation is interrupted (to step S201). By reducing the amount of circulating water in this way, the endothermic amount on the reheating side is reduced, the endothermic amount on the hot water supply side is relatively increased, and the hot water temperature (Tmix) is increased.
[0043]
FIG. 5 shows the flow of operation when the hot water supply to the hot water supply side starts during the reheating independent operation. During the reheating independent operation (mode 1 state in which high-temperature hot water is retained in the heat exchanger 13 portion of the hot water supply pipe 21) (step S301), when a hot water supply operation request (hot water supply interruption) occurs (step S302; Y) Wait until the state mode of the single can / two water channel hot water bath 10 is changed from mode 1 to mode 2 via mode 3 (step S303; Y), and the circulation pump 32 is turned off (step S304). Subsequent operations are the same as those in step S204 and subsequent steps in FIG. 4, and a description thereof will be omitted.
[0044]
Thus, when the hot water supply interruption occurs during the reheating operation, the circulation pump 32 is temporarily turned off. Therefore, the operation after step S305 is made common with the operation after step S204 when the bath interruption occurs during the hot water supply independent operation. It is possible to simplify the control. In addition, since the circulation pump 32 is gradually increased from the minimum flow rate (qmin) when shifting to the simultaneous operation, the hot water temperature (Tmix) does not drop suddenly at the start of the simultaneous operation, and the comfortable hot water is discharged. It can be performed.
[0045]
In addition, when the burner 12 is burned to the maximum, it is not possible to discharge hot water at the hot water supply set temperature (Tsp) by the required amount. Can be shortened to the maximum.
[0046]
FIG. 6 shows an operation in the case of shifting to simultaneous operation control with the circulating water amount at the time of occurrence of hot water supply as an initial value without temporarily turning off the circulation pump 32 when a hot water supply interruption occurs during the reheating independent operation. ing. Compared to FIG. 5, the flow shown in FIG. 6 includes step S304 for turning off the circulation pump 32, step S306 for initially setting the circulation water amount of the circulation pump 32 to the minimum flow rate (qmin), and the minimum flow rate (qmin). The process (steps S307 to S309) for preventing the hot water temperature (Tmix) from lowering due to the reheating of step S312 and the step S312 for increasing the circulating water amount by Δq from the minimum flow rate (qmin) are deleted. Further, even when the opening degree of the flow rate control valve (GM2) 25 is not fully opened (step S305; Y), the processing for stopping the circulation pump 32 (step S310) is different, and other steps are different from those shown in FIG. It is the same.
[0047]
When the required amount of hot water at the hot water supply temperature (Tsp) can be discharged to the hot water supply side in the initial amount of circulating water when shifting to the simultaneous operation (step S305; N), a range that does not hinder the hot water supply side Thus, the reheating operation is continued while increasing / decreasing the circulating water amount (from step S313 to step S319). On the other hand, when the required amount of hot water at the hot water supply set temperature (Tsp) cannot be discharged to the hot water supply side in the initial amount of circulating water when shifting to the simultaneous operation (step S305; Y), the circulation pump 32 is stopped. (Step S310), it shifts to hot water supply single operation once (Step S311). As described above, once the operation is shifted to the hot water supply single operation, the operation shown in FIG. 4 is performed thereafter, and the reheating operation is performed within a range where there is no problem on the hot water supply side.
[0048]
In the embodiment described above, the increase / decrease amount Δq per one time of the circulating water amount and the increase / decrease amount Δi per time of the proportional valve current (i) are set to constant values. May be. For example, the magnitudes of Δq and Δi may be set according to the deviation between the hot water temperature (Tmix) and the hot water supply set temperature (Tsp).
[0049]
【The invention's effect】
According to the 1 can 2 water channel type hot water bath according to the present invention, when hot water and reheating of the bath are used at the same time, the temperature is circulated so that the temperature becomes the preset hot water temperature based on the detected hot water temperature. Since the amount of water circulated by the pump is increased or decreased by feedback control, it is possible to simultaneously operate hot water supply and reheating without affecting the hot water supply side, and the time required for reheating within the range where there is no problem with the hot water supply side. It can be shortened to the maximum.
[0050]
In addition, when shifting from hot water supply single operation or reheating single operation to simultaneous operation of hot water supply and reheating, the circulating water amount by the circulation pump is temporarily set to a predetermined minimum flow rate, and then the circulating water amount according to the hot water temperature on the hot water supply side In the case of increasing or decreasing the temperature, the hot water supply side is given priority from the beginning, and the temperature of the discharged hot water is prevented from temporarily decreasing at the start of simultaneous operation. In addition, even after switching from reheating independent operation to simultaneous operation, once the circulating water volume is reduced to the minimum flow rate, the circulating water volume is controlled based on the tapping temperature, so simultaneous operation from hot water supply independent operation where the circulation pump is not operating is performed. It is possible to share the control when shifting to the simultaneous operation and the case of shifting from the chasing single operation to the simultaneous operation, and to simplify the control.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing a one-can two-way hot water hot water bath according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a circuit configuration of a control base included in the single can / two water channel hot water hot water bath according to the embodiment of the present invention.
FIG. 3 is a flowchart showing a flow when a can of two water channel type hot water baths according to an embodiment of the present invention controls the flow rate of the circulation pump during simultaneous operation of hot water supply and reheating.
FIG. 4 is a flowchart showing a flow of flow control of the circulation pump that is performed when the single-can two-channel hot water hot water bath according to the embodiment of the present invention shifts from a single hot water supply operation to a simultaneous operation with reheating. .
FIG. 5 is a flowchart showing a flow of flow control of the circulation pump performed when the single can / two water channel type hot water hot water bath according to the embodiment of the present invention shifts from the reheating independent operation to the simultaneous operation with the hot water supply. .
FIG. 6 shows another example of the flow control flow of the circulation pump that is performed when the single-can / two-channel hot-water hot water bath according to the embodiment of the present invention shifts from the reheating independent operation to the simultaneous operation with the hot water supply. It is a flowchart shown.
[Explanation of symbols]
10 ... 1 can 2 water channel hot water bath
11 ... Combustion chamber
12 ... Burner
13 ... Heat exchanger
14 ... Combustion fan
19 ... Gas proportional valve
21 ... Pipe for hot water supply
22 ... Fixed bypass
23 ... Flow control valve (GM1)
24 ... Bypass
25 ... Flow control valve (GM2)
26a, 26b ... flow sensor
27 ... Incoming thermistor
28 ... Thermistor Thermistor
29 ... Hot spring thermistor
31 ... Recirculation pipe for reheating
32 ... circulation pump
33 ... Bath water switch
34 ... Bath temperature thermistor
35 ... Pouring solenoid valve
36 ... pour pipe
40 ... bathtub

Claims (5)

A heat exchanger for transferring heat from the burner to both the water in the reheating channel through which the water in the bathtub circulates and the water in the hot water flow channel through which the water supply passes, and the water in the bathtub through the reheating channel In a 1-can 2-water-type hot water bath equipped with a circulation pump for circulation,
A hot water temperature detecting means for detecting the temperature of hot water discharged through the hot water supply passage, and a circulation pump control means for controlling the amount of circulating water by the circulation pump,
When the hot water supply and the reheating of the bath are used at the same time, the circulating pump control means controls the circulating pump so that the temperature becomes the hot water supply set temperature based on the hot water temperature detected by the hot water temperature detecting means. Increase or decrease the circulating water volume,
When shifting from hot water supply single operation or reheating single operation to simultaneous operation of hot water supply and reheating, the amount of circulating water by the circulation pump is temporarily set to a predetermined minimum flow rate, and then the amount of circulating water according to the hot water temperature on the hot water supply side 1 can 2 waterways water heating bathtub you characterized by increasing or decreasing the. A heat exchanger for transferring heat from the burner to both the water in the reheating channel through which the water in the bathtub circulates and the water in the hot water flow channel through which the water supply passes, and the water in the bathtub through the reheating channel In a 1-can 2-water-type hot water bath equipped with a circulation pump for circulation,
A hot water temperature detecting means for detecting the temperature of hot water discharged through the hot water supply passage, and a circulation pump control means for controlling the amount of circulating water by the circulation pump,
When the hot water supply and the reheating of the bath are used at the same time, the circulating pump control means controls the circulating pump so that the temperature becomes the hot water supply set temperature based on the hot water temperature detected by the hot water temperature detecting means. Increase / decrease the circulating water volume, and when the required amount of hot water is discharged at the hot water supply side at the hot water supply set temperature, the circulating water volume is increased and the required amount of hot water at the hot water supply side remains at the hot water supply set temperature even when the burner is burned to the maximum. One can two water channel type hot water bath, which reduces the amount of circulating water when no hot water is discharged. The circulating pump control means increases the circulating water amount when a required amount of hot water is discharged on the hot water supply side at a hot water supply set temperature, and the required amount of hot water remains on the hot water supply side even when the burner is maximally burned. in hot water is 1 can 2 waterways water heating bathtub of claim 1 Symbol mounting, characterized in that reducing the circulation water when it is no longer. A heat exchanger for transferring heat from the burner to both the water in the reheating channel through which the water in the bathtub circulates and the water in the hot water flow channel through which the water supply passes, and the water in the bathtub through the reheating channel In a 1-can 2-water-type hot water bath equipped with a circulation pump for circulation,
A hot water temperature detecting means for detecting the temperature of hot water discharged through the hot water supply passage, and a circulation pump control means for controlling the amount of circulating water by the circulation pump,
When the hot water supply and the reheating of the bath are used at the same time, the circulating pump control means controls the circulating pump so that the temperature becomes the hot water supply set temperature based on the hot water temperature detected by the hot water temperature detecting means. When the required amount of hot water is no longer discharged to the hot water supply side at the set hot water temperature even if the circulating water volume is increased or decreased and the circulating flow rate is limited to the preset minimum flow rate with the burner maximally combusting , 1 cans 2 waterways water heating bathtub you characterized by temporarily stopping the circulation pump stops reheating operation. In the circulating pump control means, even if the circulating flow rate is limited to a preset minimum flow rate under the state where the burner is maximally combusting, the required amount of hot water is not discharged to the hot water supply side at the hot water supply set temperature. 4. The single can / two water channel type hot water hot water bath according to claim 1, wherein the circulating pump is stopped and the chasing operation is temporarily stopped.

Images