JP3748610B2 - Hot water supply device with memorial function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply device with a memorial function, and more particularly to improvement of hot water filling control to a bathtub.
[0002]
[Prior art]
A hot water supply device with a memorial function that can fill a bathtub is filled. This hot water supply device with a reheating function includes a hot water supply heat exchanger, a reheating heat exchanger, a hot water supply burner and a reheating burner for supplying combustion heat to these heat exchangers, respectively. The remedy heat exchanger is connected to the bathtub through the outgoing pipe and the return pipe. The outlet side of the hot water supply heat exchanger is connected to one of the outgoing pipe and the return pipe via a hot water filling pipe. When filling the bathtub with hot water, the hot water heated to the set temperature by the hot water heat exchanger by the combustion of the hot water burner is passed through the hot water filling pipe, and then supplied to the bathtub through both the forward and return pipes (hot water). Tension). When hot water is filled in the bathtub to the set water level in this way, combustion in the remedy burner is performed with the hot water in the tub circulated, and the hot water passing through the heat exchanger for remedy is heated (memorial). By doing so, the hot water in the bathtub is set to the set temperature.
[0003]
[Problems to be solved by the invention]
During the hot water filling, the hot water from the hot water supply heat exchanger is supplied to the bathtub separately in two passages, an outward pipe and a return pipe. That is, the hot water from the hot water supply heat exchanger is supplied to the bathtub separately into a passage that passes through the heat exchanger for remedy and a passage that does not pass through the heat exchanger for remedy. Conventionally, combustion of the hot water supply burner is controlled so that the temperature of the hot water detected by the temperature sensor on the outlet side of the hot water supply heat exchanger becomes a set temperature. Therefore, hot water that does not pass through the heat exchanger for remedy is supplied to the bathtub at the set temperature, but hot water that passes through the heat exchanger for remedy becomes lower than the set temperature and is supplied to the bathtub. This is because the heat exchanger for remembrance that is not in a combustion state takes heat from the hot water passing there. As a result, since the hot water in the bathtub was lower than the set temperature at the end of the hot water filling, it was necessary to commemorate for a relatively long time thereafter.
[0004]
[Means for Solving the Problems]
  As shown in FIG. 1, the combustion apparatus with a reheating function according to the invention of claim 1 supplies combustion heat to the hot water supply heat exchanger 1, the reheating heat exchanger 2, and the hot water supply heat exchanger. A hot water supply burner 3, a reheating burner 4 for supplying combustion heat to the reheating heat exchanger, a forward pipe and a return pipe connecting the reheating heat exchanger and the bathtub, and the hot water supply The hot water pipe connecting the outlet side of the heat exchanger to one of the outgoing pipe and the return pipe, the hot water valve 5 provided in the hot water pipe, and the hot water temperature on the outlet side of the hot water heat exchanger. A first temperature sensor 6 to be detected, a second temperature sensor 7 provided on the other of the outgoing pipe and the return pipe, and a hot water filling control means 8 are provided. The hot water filling control means 8 opens the hot water filling valve and the hot water supply burner.3Heat exchanger for hot water that received the heat of combustion1Hot water from the outlet pipe and the return pipe is supplied to the bathtub so as to pass through both the passage including the forward pipe and the return pipe, and the passage including the other forward pipe and the return pipe and the heat exchanger 2 for remedy. The temperature of hot water that does not pass through the heat exchanger 2 for chasing detected by the first temperature sensor 6 and the temperature of hot water that has passed through the heat exchanger 2 for chasing detected by the second temperature sensor 7Based on the distribution ratio of hot water that does not pass through the heat exchanger for remedy and hot water that passes through the heat exchanger for remedy, it passes through the hot water that does not pass through the heat exchanger for remedy and the heat exchanger for remedy. So that the temperature of the combined hot water in the bathtub with hot water becomes the set temperature,Control the combustion of the hot water supply burner 3ThatFeatures.
[0006]
  Claim2The invention ofA hot water supply heat exchanger, a reheating heat exchanger, a hot water supply burner for supplying combustion heat to the hot water supply heat exchanger, and a reheating burner for supplying combustion heat to the reheating heat exchanger , An outward pipe and a return pipe connecting the heat exchanger for remedy and the bathtub, a hot water pipe connecting the outlet side of the hot water heat exchanger to one of the forward pipe and the return pipe, and the hot water filling A hot water filling valve provided on the pipe, a first temperature sensor for detecting the hot water temperature on the outlet side of the hot water supply heat exchanger, a second temperature sensor provided on the other of the outgoing pipe and the return pipe, and a bathtub ofA residual water amount detecting means for detecting the residual water amount, a residual water temperature detecting means for detecting the temperature of the residual water,Hot water filling control means,The hot water filling control meansThe hot water filling valve is opened, and hot water from the hot water heat exchanger that has received the combustion heat of the hot water burner is passed through a passage including one of the forward pipe and the return pipe, and the other of the forward pipe and the return pipe. The temperature of the hot water that is supplied to the bathtub so as to pass through both the passages including the heat exchanger for remedy and that does not pass through the heat exchanger for remedy detected by the first temperature sensor, and the second temperature The temperature of the hot water that has passed through the heat exchanger for remedy detected by the sensor, the distribution ratio of hot water that does not pass through the heat exchanger for remedy and hot water that passes through the heat exchanger for remedy,Controlling combustion of the hot water supply burner based on the information including the amount of remaining water and the temperature of the remaining water so that the temperature of the hot water in the bathtub at the time when the hot water has been supplied to the set water level becomes the set temperature. It is characterized by.
[0007]
  Claim3The invention of claim2In the hot water supply device with a tracking function described in the above, the hot water filling control means updates the set temperature based on the residual water amount, the residual water temperature, and the initial set temperature set by the temperature setting means, and So that the temperature of the combined hot water in the bathtub of hot water that does not pass and the heat exchanger passes through this updated set temperature,Based on the temperature detected by the first and second temperature sensors and the distribution ratio,Controlling the combustion of the hot water supply burner.
[0008]
  Claim4The invention of claim1-3In the hot water supply device with a chasing function according to any one of the above, the hot water filling control means is the hot water detected by the first and second temperature sensors in a state where the hot water burner is burned in the initial stage of the hot water filling. Temperature deviation ofThe above distribution ratio;A target temperature is calculated based on the set temperature, and thereafter, combustion of the hot water supply burner is controlled based on the temperature of the hot water detected by the first temperature sensor and the target temperature.
[0009]
  Claim5The invention of claim1-3In the hot water supply device with a chasing function according to any one of the above, the hot water filling control means includes the temperature of the hot water detected by the first and second temperature sensors.Above distribution ratioThen, the temperature of the merged hot water in the bathtub is calculated, and combustion of the hot water supply burner is controlled based on the calculated temperature of the merged hot water and the set temperature.
[0010]
  Claim6The invention of claim1-5In the hot water supply device with a tracking function according to any one of the above, the hot water filling control means includes not only the combustion control of the hot water burner but also the hot water supply heat exchanger so that the temperature of the combined hot water becomes a set temperature. It is also characterized in that it also performs opening control of a water amount control valve provided on the inlet side.
[0011]
  Claim7The invention of claim 1 to claim 16In the hot water supply device with a tracking function according to any one of the above, further comprising capability determination means for determining whether or not the temperature of the combined hot water can be set to the set temperature by combustion of only the hot water supply burner, the hot water filling control The means controls combustion of the hot water supply burner in a state in which the chasing burner is burned when a negative determination is made by the ability judging means.
[0012]
  A combustion apparatus with a remedy function according to the invention of claim 8 includes a heat exchanger for hot water supply, a heat exchanger for remedy, a hot water burner, a remedy burner, and a tub heat exchanger from a bathtub. A return pipe for flowing hot water to the bathtub from the outflow pipe and remedy exchanger, a hot water pipe connecting the outlet side of the hot water heat exchanger to the forward pipe, a hot water valve, and the above A first temperature sensor for detecting the temperature of the hot water at the outlet side of the heat exchanger for hot water supply, a second temperature sensor provided in the return pipe, and a connecting portion between the hot water pipe and the bathtub in the outgoing pipe A check valve provided, and a hot water control means, the hot water control means,The hot water filling valve is opened, and hot water from the hot water heat exchanger that has received the combustion heat of the hot water burner,Supply it to the bathtub through the heat exchanger for remembrance,The combustion of the hot water supply burner is controlled based on the temperature of the hot water before and after passing through the heat exchanger for remedy detected by the first and second sensors.
The invention according to claim 9 is characterized in that a pump for circulating hot water in the bathtub is provided between the check valve and the bathtub in the outgoing pipe, and the hot water supply with a remedy function according to claim 8 is provided. apparatus.
[0013]
A tenth aspect of the present invention is the hot water supply apparatus with a chasing function according to any one of the first to ninth aspects, further comprising a common fan for supplying combustion air to both the hot water supply burner and the chasing burner. And a fan control means for rotating the fan when any one of the burners is burning.
[0014]
The eleventh aspect of the present invention is the hot water supply apparatus with a chasing function according to any one of the first to ninth aspects, further comprising a common exhaust passage through which the exhaust gases of both the hot water supply burner and the chasing burner pass. , Provided with two fans for supplying combustion air to the hot water supply burner and the memorial burner, respectively, and fan control means for simultaneously rotating these two fans when any one of the burners is burning. It is characterized by.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 2, the hot water supply device with a remedy function includes a hot water supply unit 20 and a remedy unit 30. A common fan 10 is provided below the hot water supply unit 20 and the tracking unit 30 to supply combustion air to the hot water supply unit 20 and the tracking unit 30. Exhaust gas generated in the hot water supply unit 20 and the remedy unit 30 is exhausted through exhaust ducts 20 a and 30 a provided on the hot water supply unit 20 and the remedy unit 30, respectively.
[0016]
The hot water supply unit 20 includes a gas burner 21 (hot water supply burner) and a heat exchanger 22 (hot water supply heat exchanger) that is disposed on the gas burner 21 and receives combustion heat from the gas burner 21.
A water supply pipe 23 is connected to the inlet side of the heat exchanger 22 of the hot water supply unit 20, and a hot water supply pipe 24 is connected to the outlet side. The water supply pipe 23 is provided with a water flow switch 25, an incoming water temperature sensor 26, and a water amount control valve 27. The hot water supply pipe 24 is provided with a hot water supply temperature sensor 28 (first temperature sensor) in the vicinity of the heat exchanger 22, and a water flow switch 29 is provided downstream thereof. A hot water tap 24 a is connected to the downstream end of the hot water supply pipe 24.
[0017]
Similarly, the remedy section 30 includes a gas burner 31 (a remedy burner) and a heat exchanger 32 (a remedy heat exchanger) that is disposed on the upper portion and receives combustion heat from the gas burner 31.
The inlet side of the heat exchanger 32 of the remedy section 30 is connected to the circulation fitting 41 of the bathtub 40 via the forward pipe 33, and the outlet side is connected to the circulation fitting 41 via the return pipe 34. The outward pipe 33 is provided with a water flow switch 36, an outward path temperature sensor 37, and a pump 38. The return pipe 34 is provided with a return-side temperature sensor (second temperature sensor) 39.
[0018]
The hot water supply pipe 24 on the downstream side of the hot water supply temperature sensor 28 and the outgoing pipe 33 are connected by a hot water filling pipe 50. The hot water filling pipe 50 is provided with a hot water filling valve 55 and a pressure sensor 56 (water level sensor) for detecting the water level of the bathtub 40.
[0019]
Next, means for supplying gas to the gas burners 21 and 31 will be described in detail. The gas main pipe 70 is provided with a main opening / closing valve 71 and a pressure proportional valve 72. The gas main pipe 70 is connected to the hot water supply burner 21 through the branch pipe 75a, and is connected to the remedy burner 31 through the branch pipe 75b. Branch opening / closing valves 76a and 76b are provided in the branch pipes 75a and 75b, respectively.
[0020]
The hot water supply apparatus includes a control unit 90 including a microcomputer 91. This microcomputer 91 includes detection signals from the various sensors 25, 26, 28, 29, 36, 37, 39, 56, hot water supply and bath setting temperature signals from the temperature setting means of the remote controller 80, and the remote controller 80. In response to an automatic operation command signal from the automatic operation button, the water amount control valve 27, the hot water filling valve 55, the pump 38, and the gas supply valves 71, 72, 76a and 76b are controlled. Further, the microcomputer 91 rotates the fan 10 when performing combustion in at least one burner of the hot water supply unit 20 and the memorial unit 30.
[0021]
In the above configuration, when the hot water tap 24a is opened, the water flow switch 25 detects the water flow. The microcomputer 91 executes normal hot water supply control in response to the water flow detection signal. That is, the main on-off valve 71 and the branch on-off valve 76a are opened to supply gas to the hot water supply gas burner 21, and combustion in the hot water supply unit 20 is executed. At this time, the hot water temperature detected by the hot water temperature sensor 28 is made to coincide with the hot water temperature setting temperature by controlling the pressure proportional valve 72 or the water amount control valve 27.
[0022]
The microcomputer 91 executes automatic operation in response to the automatic operation command signal from the automatic operation button of the remote controller 80. Automatic operation begins with hot water filling control. In this hot water filling control, hot water from the hot water supply heat exchanger 22 is passed through the hot water filling pipe 50 by opening the hot water filling valve 55 while performing combustion in the hot water supply burner 21, and further, the outgoing pipe 33, The water is supplied to the bathtub 40 through both the return pipes 34. When the hot water in the bathtub 40 reaches the set water level (when the hot water filling is completed), the pump 38 is driven to circulate the hot water in the bathtub 40 through the forward pipe 33 and the return pipe 34. It is checked whether the hot water detected by the sensor 37 matches the bath set temperature (hereinafter, set temperature). When the temperature of the hot water in the bathtub 40 is lower than the set temperature, combustion in the remedy burner 31 is executed, and the temperature of the hot water in the bathtub 40 is matched with the set temperature.
[0023]
After that, the microcomputer 91 monitors the water level of the bathtub 40 based on the signal from the pressure sensor 56, and when the water level falls below the set water level, the hot water from the hot water supply unit 20 is added to the bathtub in the same manner as when the hot water is filled. 40 to keep the bathtub 40 at the set water level (automatic water retention). Moreover, the hot water of the bathtub 40 is circulated periodically, and the hot water temperature is monitored, and when it is lower than the set temperature, the hot water of the bathtub 40 is tracked and matched with the set temperature (automatic heat retention).
[0024]
Next, the hot water filling which is a characteristic part of the present invention will be described in detail. During hot water filling, combustion is performed in the hot water supply burner 21, but combustion is not performed in the memorial burner 31. The hot water from the hot water supply heat exchanger 22 is divided into two hands, and one is supplied to the bathtub 40 while maintaining its temperature through the outgoing pipe 33, while the other is additionally cooled by the air from the fan 10. Heat is removed when passing through the heat exchanger 32 for firewood, and supplied to the bathtub 40 through the return pipe 34.
[0025]
The temperature of the hot water that is actually filled, that is, the temperature T of the hot water that is supplied to the bathtub 40 through both the outgoing pipe 33 and the return pipe 34 and is to be merged in the bathtub 40_U(Weighted average temperature) is the temperature T of hot water supplied to the bathtub without passing through the heat exchanger 32 for remembrance.₁(Detected by the hot water temperature sensor 28), the temperature T of the hot water that has passed through the heat exchanger 32 for remedy₂(Detected by the return side temperature sensor 39) and determined by the distribution ratio X of hot water to the return pipe 34 and the forward pipe 33: (1-X), and can be expressed by the following equation.
T_U= T₁(1-X) + T₂・ X (1)
The above equation (1) can be rewritten as the following equation.
T_U= T₁-ΔT · X (2)
Where ΔT is the temperature T₁, T₂Deviation (T₁-T₂).
[0026]
As in the prior art, the hot water temperature T detected by the hot water temperature sensor 28.₁Is set temperature T set by remote controller 80_SWhen the pressure proportional valve 72 is controlled so that the amount of combustion heat in the hot water supply burner 21 is controlled, T in the above equation (2)₁= T_SBy substituting_UCan be expressed as:
T_U= T_S-ΔT · X (3)
As is clear from the above equation (3), the temperature T of the combined hot water_UIs the set temperature T_SIt becomes lower by ΔT · X, and a long remedy time is required after filling up to the set water level.
[0027]
Therefore, in this embodiment, the set temperature T is set so as to compensate for the amount of heat taken away by the memory heat exchanger 32._SHigher target temperature T_MSet. This target temperature T_MThe detected temperature T₁The combustion of the hot water supply burner 21 is controlled so as to match.
This target temperature T_MIs obtained according to the following equation.
T_M= T_S+ ΔT · X (4)
And target temperature T_MThe detected temperature T₁The combustion of the hot water supply burner 21 is controlled so as to match. For this control, T_M= T₁By substituting the above equation (4) into the above equation (2), the following equation is obtained.
T_U= T_S    (5)
This equation (5) is obtained by the above control and the temperature T of the merged hot water._UIs set temperature T_SIs equal to
[0028]
More specifically, in the microcomputer 91, the hot water temperature T detected by the hot water supply temperature sensor 28 in the initial stage of hot water filling control.₁Is set temperature T_SThus, the amount of combustion heat in the hot water supply burner 21 is controlled. At this time, the hot water temperature T detected by the return-side temperature sensor 39.₂And the above temperature T₁Is calculated from the above equation (4) based on the temperature deviation ΔT and the distribution ratio X._MIs calculated. Thereafter, the detected temperature T₁Is this target temperature T_MThe hot water supply burner 21 is controlled so as to match the above.
[0029]
For example, set temperature T_SIs set to 42 ° C., the detected temperature T of the hot water supply temperature sensor 28 at the initial stage of hot water filling control.₁The hot water supply burner 21 is controlled so that the set temperature becomes 42 ° C. At this time, if the temperature detected by the return side temperature sensor 39 is 40 ° C., the temperature deviation ΔT is 2 ° C. Next, based on the temperature deviation ΔT = 2 ° C. and the distribution ratio X = 0.4, the target temperature T_M= 42.8 ° C is determined. Thereafter, the temperature T detected by the hot water temperature sensor 28₁However, the combustion of the hot water supply burner 21 is controlled so that the target temperature becomes 42.8 ° C.
[0030]
As mentioned above, the actual hot water filling temperature (the temperature of the merging hot water) T_U, Set temperature T_STherefore, after the hot water is filled up to the set water level, there is no need for the chasing in the chasing part 30 or only a very short time is required.
[0031]
Next, the automatic operation routine executed by the microcomputer 91 in response to the turning on of the automatic operation button will be described in detail with reference to the flowcharts of FIGS. First, the set temperature T set by the remote controller 80_SIs read (step 101). Next, the water amount control valve 27 is fully opened (step 102), and the hot water filling valve 55 is opened (step 103).
[0032]
Next, the temperature T of hot water from the hot water supply heat exchanger 22 detected by the hot water supply temperature sensor 28.₁Is read (step 104), and combustion control of the hot water supply side burner 21 is performed as initial hot water filling control (step 105). That is, the main on-off valve 71 and the branch on-off valve 76a are opened, and the detected temperature T₁Is set temperature T_SThe opening degree of the pressure proportional valve 71 is controlled so that the gas supply amount to the hot water supply burner 21 is controlled. In this combustion control, the fan 10 is rotated to supply combustion air to the hot water supply burner 21, and the number of rotations is made in accordance with the amount of supplied gas.
[0033]
  Next, the hot water temperature T detected by the hot water temperature sensor 28.₁It is determined whether or not is stable (step 106). Here, stable means the temperature T of hot water.₁Is set temperature T_SIn addition to the case where it is stabilized in a state consistent with the above, the case where the combustion ability of the hot water supply burner 21 is insufficient and the state where the combustion is stable at a state lower than the set temperature is also included. In this case, ΔT isT ₁ = T _S in the case ofAlthough a slight difference is generated as compared with the above, it is not a large difference, and may be substantially the same. If it is determined that it is not stable, steps 104 and 105 are repeated.
[0034]
If it is determined in step 106 that the temperature is stable, the temperature detected by the return-side temperature sensor 39, that is, the temperature T of the hot water that has passed through the heat exchanger 32 for remedy.₂Is read (step 107). Next, the detected temperature T₁To detection temperature T₂Is subtracted to obtain the deviation ΔT (step 108). Next, the deviation ΔT, the distribution ratio X, and the set temperature T_SIs substituted into the above equation (4) and the target temperature T_MGet.
[0035]
Next, the target temperature T_MSet temperature T_SIs used instead of the full-scale hot water filling control and the accompanying control (step 110). These controls comprise steps 111 to 119 shown in FIG. First, the temperature T detected by the hot water supply temperature sensor 28₁(Step 111), and this detected temperature T₁Is the target temperature T_MThen, the opening degree of the pressure proportional valve 72 is controlled to control the gas supply amount to the hot water supply burner 21 (step 112). Next, it is determined whether or not the pressure proportional valve 72 is fully opened (step 113). If an affirmative determination is made here, that is, the combustion capacity of the hot water supply burner 21 has reached its limit, the temperature T₁Is the target temperature T_MIf the pressure proportional valve 72 is fully opened, the opening degree of the water amount control valve 27 is set to the detected temperature T.₁Is the target temperature T_M(Step 114). Thereby, the detected temperature T₁Surely target temperature T_MAnd consequently the temperature T of the combined hot water_USurely set temperature T_SCan be.
[0036]
Next, it is determined whether or not the water level of the bathtub 40 detected by the pressure sensor 56 has reached the set water level (step 115). If a negative determination is made in step 113, step 114 is skipped and step 115 is executed. If a negative determination is made in step 115, the process returns to step 111 and the hot water filling is continued. If an affirmative determination is made in step 115, the hot water filling is terminated (step 116). That is, the hot water filling valve 55 is closed, and the combustion control of the hot water supply burner 21 is finished. Next, the pump 38 is driven to circulate the temperature of the bathtub 40 (step 117), and the temperature of the bathtub 40 detected by the outward path temperature sensor 37 is set to the set temperature T._STo determine whether or not. When a negative determination is made, the chasing burner 31 is burned to perform chasing (step 119), and the process returns to step 117. As mentioned above, there is little or no need for memorial here. If an affirmative determination is made in step 118, the process proceeds to step 120 in FIG. 3, where automatic heat retention and automatic water retention control are executed.
[0037]
In addition, in the said Example, the temperature T of the hot water which flows from the heat exchanger 22 for hot water supply₁Is detected by the hot water supply temperature sensor 28, but may instead be detected by the forward path temperature sensor 37 (first temperature sensor). This is because the hot water passing through the outgoing pipe 33 from the outlet side of the hot water supply heat exchanger 22 does not pass through the heat exchanger 32 for remedy and is not deprived of heat.
[0038]
In the above embodiment, the target temperature T_MWhen the combustion of the hot water supply burner 21 is controlled to calculate the temperature T, the temperature T at the outlet side of the hot water supply heat exchanger 22 is calculated.₁Is set temperature T_SIn the case where the combustion capacity of the hot water supply burner 21 is sufficient, the temperature deviation ΔT is equal to the set temperature T._STo detection temperature T₂It may be obtained by subtracting. Set temperature T_SIs substantially the detected temperature T₁It is because it represents.
[0039]
In the above embodiment, the target temperature T_MWhen the combustion of the hot water supply burner 21 is controlled in order to calculate the temperature of the hot water supply burner 21, even if combustion is performed in a state where the capability of the hot water supply burner is limited (the pressure proportional valve 72 is fully open), the detected temperature T₁Is set temperature T_SWhen the temperature does not reach, the detected temperature T is controlled by the throttle control of the water amount control valve.₁Set temperature T_SYou may make it match. In this case, a slight difference in ΔT does not occur, and it becomes more accurate.
[0040]
In the above embodiment, the pressure proportional valve 72 may be moved to the branch pipe 75a. In this case, another pressure proportional valve may or may not be provided in the branch pipe 75b. In such a configuration, it is possible to supplement the combustion capability of the hot water supply burner 21 by adding combustion of the hot water burner 31 during hot water filling without changing the skeleton of the control routine of FIGS. it can. More specifically, in step 106 of FIG.₁Is determined to be stable, the process proceeds to step 201 in FIG.₁Is set temperature T_STo determine whether or not If the determination is affirmative, the routine proceeds to step 107 in FIG. When a negative determination is made in step 201, that is, when it is determined that the combustion capacity of the hot water supply burner 21 is insufficient, the remedy burner 31 is burned with a predetermined gas supply amount (predetermined heat amount) in addition to the hot water supply burner 21 ( Step 202). Next, in the combustion state of both burners 21 and 22, the detected temperature T₁Is determined to be stable. If a negative determination is made, the process returns to step 201. If an affirmative determination is made, the process proceeds to step 107 in FIG.
[0041]
Thus, when the combustion capability of the hot water supply burner 21 is insufficient, the combustion burner 31 also performs combustion. Since the combustion of the commemorative burner 21 is continued even in the full hot water filling control, the temperature T of the combined hot water_USurely set temperature T_SCan be. In this embodiment, the temperature T of the hot water that has passed through the heat exchanger 32 for remembrance.₂Is the temperature T of hot water that does not pass through the heat exchanger 32 for remembrance.₁May be higher. In this case, the target temperature T_MIs the set temperature T_SLower.
[0042]
In the above embodiment, the target temperature T_MThe hot water filling control is divided into an initial control and a full-scale control thereafter, but the target temperature T_MA consistent control method may be used without using. That is, the detected temperature T₁, T₂From the equation (1), the temperature T of the combined hot water_UIs calculated.
And this temperature T_UIs the set temperature T_SControl to become. In this control method, it is not necessary to divide into initial control and full-scale control, and it is not affected by the change of the temperature of the heat exchanger 32 for remedy over time. In this case, in the microcomputer 91, after steps 104 to 109 in FIG. 3 are omitted and steps 101, 102, and 103 are executed, in step 111a in FIG.₁Not only detection temperature T₂Is also read, and the temperature T of the combined hot water in step 111b_UIs calculated. These steps 111a and 111b should replace step 111 in FIG. Thereafter, step 112 and subsequent steps in FIG. 4 are executed. In this embodiment, the pressure proportional valve control in step 112 in FIG. 4 and the water amount control valve control in step 114 are performed as follows._UAnd set temperature T_SBased on.
[0043]
Using the hot water supply device with the memorial function shown in FIG._UAnd set temperature T_SWhen the hot water filling control is performed based on the above, the hot water burner 31 may be burned in order to supplement the capability of the hot water supply burner during hot water filling. In this case, the microcomputer 91 executes the control of FIG. That is, similar to the embodiment of FIG. 6 above, after executing steps 111a and 111b, the temperature T_UAnd set temperature T_SThe pressure proportional valve is controlled based on (Step 301). Next, it is determined whether or not a flag is set (step 302). This flag indicates that the combustion of the remedy burner 31 is being executed. If a negative determination is made in step 302, it is determined whether or not the pressure proportional control valve 72 is fully opened (step 303). If fully open, the branch on-off valve 76b is opened and the combustion burner 21 is combusted. (Step 304), the process proceeds to step 305. If a negative determination is made in step 303, step 304 is skipped and the process proceeds to step 305. It should be noted that the amount of combustion heat of the remedy burner 21 varies depending on the opening degree of the pressure proportional valve 72. In step 305, it is determined whether or not the water level of the bathtub 40 has reached the set water level. If the determination is negative, the process returns to step 111a. If the determination is affirmative, the process proceeds to step 116 (FIG. 4).
[0044]
As another aspect, the hot water filling control can be performed in consideration of the remaining water in the bathtub 40. More specifically, after executing step 102 in FIG. 3, the process proceeds to step 401 in FIG. 8, where the pump 38 is turned on. Next, it is determined whether or not the water flow switch 36 is on, that is, whether or not a water flow has been detected. If there is no residual water in the bathtub 40 or if the residual water level is lower than the position of the circulation fitting 41, no water flow is detected, so a negative determination is made here and the routine proceeds to step 403 where the pump 38 is turned off. The Next, a predetermined amount of pouring is performed (step 404). That is, when the hot water filling valve 55 is opened, the detected temperature T₁Is set temperature T_SThe hot water supply burner 21 is controlled so that Next, the pump 38 is turned on again (step 405), and the presence or absence of water flow is detected (step 406).
[0045]
When an affirmative determination is made in either step 402 or 406, the temperature of the circulating hot water, that is, the hot water in the bathtub 40 (residual water temperature) detected by the outward path temperature sensor 37 is read (step 407), and then the pump 38 is turned off. To do. Next, the water level of the bathtub 40 is read by the pressure sensor 56 and the remaining water amount is calculated (step 409). Next, set temperature T_SIs updated (skip 410), and the process proceeds to step 103. When a negative determination is made in step 406, the set temperature T_SAssuming that only the hot water poured in is in the bathtub 40, steps 407 to 410 are skipped, and the process proceeds to step 103 without updating the set temperature.
[0046]
The updated set temperature is obtained based on the initial set temperature (the temperature set by the remote controller 80), the remaining water amount, and the remaining water temperature. That is, the update set temperature is higher than the initial set temperature, but the deviation is larger as the residual water amount is larger, the residual water temperature is lower, and the deviation is smaller, the smaller the residual water amount is, and the higher the residual water temperature is.
The update of the set temperature based on the remaining water can also be applied to the embodiments of FIGS.
[0047]
In all the embodiments described above, hot water from the hot water supply heat exchanger 21 flows to both the outgoing pipe 33 and the return pipe 34 during hot water filling. For example, the outgoing pipe 34 (hot water in FIG. When the check valve 60 is provided between the connection with the tension pipe 50 and the pump 38, hot water from the hot water supply heat exchanger 22 does not flow through the outgoing pipe 33, and the heat for remedy It flows only in the passage including the exchanger 32 and the return pipe 34 and is supplied to the bathtub 40. Also in this case, the control routines of FIGS. 3 and 4 can be used. In this case, however, the target temperature T_MIs obtained as follows.
T_M= T_S+ ΔT
[0048]
  All the control methods shown in FIGS. 3 to 8 can also be applied to a hot water supply device with a memorial function configured as shown in FIG. 9, components corresponding to those in FIG. 2 are given the same reference numerals, and detailed description thereof is omitted. In the apparatus of FIG.502 is different from the apparatus of FIG. In this configuration, hot water from the hot water supply heat exchanger 22 is supplied to the bathtub 40 via both the outgoing pipe 33 and the return pipe 34, but hot water passing through the remedy heat exchanger 32 is returned to the return pipe 34. Instead, it flows through the outgoing pipe 33. When this device is applied, the temperature of hot water that has passed through the heat exchanger 32 for remedy is detected by an outward path temperature sensor 37 (second temperature sensor). The detected temperature is detected by the microcomputer 91 using the aforementioned T.₂Used as In this embodiment, the return side temperature sensor 39 (FIG. 2) may be omitted.
[0049]
As shown in FIG. 10, all the control methods shown in FIGS. 3 to 8 have two fans 10 in the hot water supply section 20 and the retreat section 30, respectively, and a hot water supply with a retreat function having a common exhaust passage 65. When applied to the apparatus, the same actions and effects as those applied to the apparatus of FIG. 2 can be expected. This is because it is necessary to rotate the two fans 10 at the same time in order to prevent the exhaust gas from the hot water supply section 20 from entering the remedy section 30 as shown by the arrow even when only the hot water supply burner 21 is burned during hot water filling. This is because the remedy heat exchanger 32 is cooled by the air blown from the fan 10. 10 mainly shows the differences from the apparatus of FIG. 2, and the portions not shown are the same as those of the apparatus of FIG.
[0050]
Various aspects of the present invention are possible without being restricted by the above-described embodiments. For example, the present invention may be applied during automatic water retention. There may be no fan.
According to the present invention, it is possible to separate the amount of heat given by the memorial after the conventional pouring, that is, the amount of heat taken away by the bath heat exchanger during pouring and the amount of heat taken away by the heat radiation (outward pipe, return pipe, bathtub), so that they are not separated. This makes it possible to pour hot water more accurately than when the hot water is poured at a high temperature. Specifically, there is a difference in the amount of heat taken away by heat dissipation (outward pipe, return pipe, bathtub) when the bathtub is warm and cold, and when the hot water is poured at a high temperature based on the cold state, If the bath is warm, the temperature after pouring will be the bath set temperature T_SIt gets higher. In the present invention, the amount of heat deprived by the bath heat exchanger and the amount of heat deprived by heat radiation (outward pipe, return pipe, bathtub) are separated to achieve the target temperature T_MThe temperature after pouring is the bath set temperature T_SIt will never get higher.
[0051]
【The invention's effect】
  According to invention of Claim 1, the temperature of the hot water which passes the heat exchanger for remedies, and the hot water which does not passAnd the distribution ratio of these hot waterSince the hot water supply burner is controlled based on the above, the hot water filling control can be performed in consideration of the temperature change of the hot water passing through the heat exchanger for remedy.Also,Hot water filling control is performed such that the temperature of the hot water that passes through the heat exchanger for remedy and the hot water that does not pass reaches the set temperature, so that the remedy after the hot water can be omitted or the remedy time can be shortened.
[0052]
  Claim2According to the invention, even when there is residual water in the bathtub, the hot water filling is performed in consideration of the residual water amount and the residual water temperature, so that the post-hot water charging can be omitted or the hot water time can be shortened.
  Claim3According to the invention, the set temperature is updated based on the remaining water amount and the remaining water temperature in advance, and the hot water filling control is performed based on the updated set temperature.2The effect of can be obtained.
[0053]
  Claim4According to the invention, in consideration of the temperature change of the hot water passing through the heat exchanger for remedy, a target temperature different from the set temperature is obtained, and the temperature of the hot water not passing through the heat exchanger for remedy becomes this target temperature. Since the hot water filling control is performed as described above, overshoot and undershoot of the temperature of the supplied hot water can be suppressed with relatively simple control.
  Claim5According to the invention, the hot water filling control is performed so that the temperature of the merged hot water becomes the set temperature while monitoring the temperature of the merged hot water. The temperature of the merged hot water can be set to the set temperature.
[0054]
  Claim6According to this invention, even if the amount of combustion heat of the hot water supply burner is insufficient, the temperature of the combined hot water can be reliably set to the set temperature by controlling the amount of water with the water amount control valve.
  Claim7According to this invention, even if the combustion heat quantity of the hot water supply burner is insufficient, the temperature of the merging hot water can be reliably set to the set temperature by simultaneously executing the combustion control of the remedy burner.
[0055]
  Claim8According to the invention, the hot water from the heat exchanger for hot water supplyTheSupplied to the bathtub only through the passage containing the heat exchanger for remembranceAndHot water filling control can be performed in consideration of the temperature change of hot water passing through the heat exchanger for remembrance.
  According to the invention of claim 10, when the hot water is filled, the common fan rotates in order to send the combustion air to the hot water supply burner, and heat is taken away from the heat exchanger for remedy by the blowing of this fan. Thus, the effects of the inventions of the first to ninth aspects can be obtained more conspicuously.
  According to the invention of claim 11, when the hot water is filled, the two fans rotate at the same time, and heat is taken away from the heat exchanger for remedy by the ventilation of one of the fans. The effects of the inventions 9 to 9 can be obtained more conspicuously.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of the present invention.
FIG. 2 is a diagram showing a schematic configuration of an embodiment of a hot water supply device with a memorial function according to the present invention.
FIG. 3 is a flowchart showing a routine executed by the microcomputer of the apparatus of FIG. 2;
FIG. 4 is a flowchart illustrating details of hot water filling control in FIG. 2;
FIG. 5 is a flowchart showing a main part of hot water filling control according to another embodiment.
FIG. 6 is a flowchart showing a main part of hot water filling control according to still another embodiment.
FIG. 7 is a flowchart showing a main part of hot water filling control according to still another embodiment.
FIG. 8 is a flowchart showing a main part of hot water filling control according to still another embodiment.
FIG. 9 is a diagram showing a schematic configuration of a hot water supply device with a memorial function according to another embodiment.
FIG. 10 is a diagram showing a schematic configuration of a hot water supply device with a memorial function that is still another embodiment, with a part omitted.
[Explanation of symbols]
1 Heat exchanger for hot water supply
2 Heat exchanger for remembrance
3 Hot water burner
4 memorial burner
5 Hot water filling valve
6 First temperature sensor
7 Second temperature sensor
8 Hot water filling control means
21 Hot water burner
22 Heat exchanger for hot water supply
27 Water control valve
28 Hot water supply temperature sensor (first temperature sensor)
31 memorial burner
32 Heat exchanger for remembrance
37 Outward temperature sensor (first temperature sensor, second temperature sensor)
39 Return-side temperature sensor (second temperature sensor)
40 bathtub
50 Hot water filled tube
55 Hot water filling valve
80 Remote controller (temperature setting means)
91 Microcomputer (Control of hot water filling)

Claims (11)

(A) a heat exchanger for hot water supply;
(B) a memorial heat exchanger;
(C) a hot water supply burner for supplying combustion heat to the hot water supply heat exchanger;
(D) a remedy burner for supplying combustion heat to the remedy heat exchanger,
(E) an outgoing pipe and a return pipe connecting the heat exchanger for remembrance and the bathtub;
(F) a hot water pipe that connects the outlet side of the hot water heat exchanger to one of the forward pipe and the return pipe;
(G) a filling valve provided on the filling pipe,
(H) a first temperature sensor for detecting a hot water temperature on the outlet side of the hot water supply heat exchanger;
(L) a second temperature sensor provided on the other of the forward and return pipes;
(Nu) Hot water filling control means,
With
The hot water filling control means opens the hot water filling valve so that hot water from the hot water supply heat exchanger that has received the combustion heat of the hot water supply burner passes through the passage including one of the forward pipe and the return pipe, and the forward pipe. The hot water which is supplied to the bathtub so as to pass through both the pipe and the other of the return pipe and the passage including the heat exchanger for reheating, and which does not pass through the heat exchanger for reheating detected by the first temperature sensor. The temperature, the temperature of hot water that has passed through the heat exchanger for remedy detected by the second temperature sensor, and the distribution ratio of hot water that has not passed through the heat exchanger for remedy and hot water that has passed through the heat exchanger for remedy Based on the above, the combustion of the hot water supply burner is performed so that the temperature of the merging hot water in the bathtub with hot water that does not pass through the heat exchanger for reheating and hot water that passes through the heat exchanger for retreating becomes the set temperature. A hot water supply device with a memorial function that is controlled. (A) a heat exchanger for hot water supply;
(B) a memorial heat exchanger;
(C) a hot water supply burner for supplying combustion heat to the hot water supply heat exchanger;
(D) a remedy burner for supplying combustion heat to the remedy heat exchanger,
(E) an outgoing pipe and a return pipe connecting the heat exchanger for remembrance and the bathtub;
(F) a hot water pipe that connects the outlet side of the hot water heat exchanger to one of the forward pipe and the return pipe;
(G) a filling valve provided on the filling pipe,
(H) a first temperature sensor for detecting a hot water temperature on the outlet side of the hot water supply heat exchanger;
(L) a second temperature sensor provided on the other of the forward and return pipes;
(Nu) residual water amount detection means for detecting the residual water amount in the bathtub ;
(Le) residual water temperature detecting means for detecting the temperature of residual water;
(Wo) hot water filling control means,
The hot water filling control means opens the hot water filling valve so that hot water from the hot water supply heat exchanger that has received the combustion heat of the hot water supply burner passes through the passage including one of the forward pipe and the return pipe, and the forward pipe. The hot water which is supplied to the bathtub so as to pass through both the pipe and the other of the return pipe and the passage including the heat exchanger for reheating, and which does not pass through the heat exchanger for reheating detected by the first temperature sensor. The temperature, the temperature of hot water that has passed through the heat exchanger for remedy detected by the second temperature sensor, and the distribution ratio of hot water that has not passed through the heat exchanger for remedy and hot water that has passed through the heat exchanger for remedy And controlling the combustion of the hot water supply burner based on the information including the amount of remaining water and the temperature of the remaining water so that the temperature of the hot water in the bathtub becomes the set temperature when the hot water has been supplied to the set water level. additionally fired function with the water heater, characterized by. The hot water filling control means updates the set temperature based on the residual water amount, the residual water temperature, and the initial set temperature set by the temperature setting means, and hot water that does not pass through the heat exchanger and hot water that passes through the heat exchanger. The combustion of the hot water supply burner is controlled on the basis of the detected temperature and distribution ratio of the first and second temperature sensors so that the temperature of the combined hot water in the bathtub is the updated set temperature. The hot water supply apparatus with a memorial function according to claim 2 . The hot water filling control means includes, in the initial stage of the hot water filling, a hot water temperature deviation detected by the first and second temperature sensors in a state where the hot water supply burner is burned, the distribution ratio, and the set temperature. based on, calculates the target temperature, thereafter, according to claim 1, wherein the controller controls the combustion of the burner the water heater based on the temperature and the target temperature of the hot water detected by the first temperature sensor A hot water supply device with a memorial function according to any one of the above. The hot water filling control means calculates the temperature of the merging hot water in the bathtub from the temperature of the hot water detected by the first and second temperature sensors and the distribution ratio, and the calculated temperature of the merging hot water 4. The hot water supply device with a remedy function according to any one of claims 1 to 3 , wherein combustion of the hot water supply burner is controlled based on the set temperature. The hot water filling control means not only controls the combustion of the hot water burner but also controls the opening of a water amount control valve provided on the inlet side of the hot water heat exchanger so that the temperature of the combined hot water becomes a set temperature. The hot water supply device with a memorial function according to any one of claims 1 to 5 , wherein the hot water supply device is also executed. Furthermore, it comprises capability determining means for determining whether or not the temperature of the combined hot water can be set to the set temperature only by combustion of the hot water supply burner, and when the hot water filling control means makes a negative determination by the capability determining means, The hot water supply apparatus with a chasing function according to any one of claims 1 to 6 , wherein combustion of the hot water supply burner is controlled in a state where the chasing burner is burned. (A) a heat exchanger for hot water supply;
(B) a memorial heat exchanger;
(C) a hot water supply burner for supplying combustion heat to the hot water supply heat exchanger;
(D) a remedy burner for supplying combustion heat to the remedy heat exchanger,
(E) a forward pipe for flowing hot water from the bathtub to the above heat exchanger for return and a return pipe for flowing hot water from the hot water exchanger to the bathtub ;
(F) a hot water filling pipe which connects the outlet side of the heat exchanger for the hot water supply to the往管,
(G) a filling valve provided on the filling pipe,
(H) a first temperature sensor for detecting a hot water temperature on the outlet side of the hot water supply heat exchanger;
(L) a second temperature sensor provided in the return pipe ;
(Nu) In the above outgoing pipe, a check valve provided between the connecting portion of the hot water pipe and the bathtub;
(Le) Hot water filling control means,
The hot water filling control means opens the hot water filling valve so that the hot water from the hot water supply heat exchanger which has received the combustion heat of the hot water supply burner passes through the heat exchanger for tracking. Supplying to the bathtub and controlling the combustion of the hot water supply burner based on the temperature of hot water before and after passing through the heat exchanger for heating detected by the first and second sensors. Hot water heater with function.   9. The hot water supply apparatus with a chasing function according to claim 8, wherein a pump for circulating hot water in the bathtub is provided between the check valve and the bathtub in the outgoing pipe.   Furthermore, a common fan that supplies combustion air to both the hot water supply burner and the memorial burner, and a fan control means that rotates the fan when one of the burners is burning are provided. The hot water supply device with a memorial function according to any one of claims 1 to 9.   Furthermore, a common exhaust passage through which exhaust gases of both the hot water supply burner and the additional burner pass, and two fans for supplying combustion air to the hot water supply burner and the additional burner, respectively, 10. A hot water supply device with a chasing function according to claim 1, further comprising fan control means for simultaneously rotating the two fans when the burner is burning.

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