JP3922788B2 - Hot water supply method and hot water supply apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply apparatus that can improve re-hot water supply characteristics.
[0002]
[Prior art]
A typical hot water supply apparatus includes a heat exchange unit, a combustion unit, and a hot water supply pipe that passes through the heat exchange unit. The pipe is provided with detection means for detecting the flow of water. When the hot-water tap provided at the downstream end of the pipe is opened, this detection means detects the flow of water in the pipe. In response to this detection signal, the control means performs combustion in the combustion section and heats the heat exchange section. The water in the pipe is heated in the process of passing through this heat exchanging section to become hot water, and is discharged from the hot water tap.
The said control means controls the amount of combustion heat in a combustion part so that the tapping temperature becomes set temperature. Then, when the hot-water tap is closed and the detection means no longer detects the flow of water in the pipe, combustion in the combustion section is stopped. In this way, hot water supply is stopped.
[0003]
By the way, in the hot water supply apparatus, a phenomenon in which the temperature of hot water staying in the heat exchanging portion temporarily stops after the hot water supply is stopped, that is, a so-called post-boiling phenomenon occurs. This is because immediately after the hot water supply is stopped, the amount of heat stored in the heat exchange unit is transmitted to the hot water remaining in the heat exchange unit.
Recently, the hot water supply apparatus takes about 1 second from the start of re-heating to the start of heat transfer from the ignition to the heat exchanging unit. During this time, water only enters the hot water supply apparatus and is not heated. Recently, when this amount of heat is supplemented with the amount of heat generated by post-boiling, and the post-boiling phenomenon is actively used, the hot-water tap is opened within a predetermined time, for example, within 5 minutes after the hot water supply is stopped, so that hot water is supplied again. Has developed a hot water supply apparatus capable of discharging hot water having a temperature close to the set temperature even immediately after the start of reheating.
[0004]
[Problems to be solved by the invention]
However, in order to stabilize the hot water immediately after reheating within 5 minutes using the post-boiling phenomenon, the amount of heat in the heat exchanging portion stored at the time of stopping the hot water supply and the heat exchanging portion are stored. The relative relationship with the amount of hot water or water needs to be within an appropriate range. If the amount of stored heat is too large for the amount of stagnant hot water, the post-boiling will remarkably increase the temperature of the stagnant hot water, and if the amount of stored heat is too small for the amount of stagnant hot water, sufficient post-boiling will be obtained. Because it is not possible. For this reason, it is necessary to appropriately design the heat capacity (mass) of the heat exchange section and the amount of retained water (the diameter and length of the pipe passing through the heat exchange section).
In addition, when a hot water supply device having a large combustion capacity (combustion number), for example, a hot water supply device of No. 32 is used in a general household, if the set temperature is around 40 degrees, even if the hot water tap is fully opened, it burns at the maximum combustion capacity. It is not generated, and only 1/2 to 1/3 of the heat of combustion is generated. In this case, although the heat capacity of the heat exchanging part is large, only a part of the heat exchange part is heated, so that the post-boiling is small and the hot water immediately after reheating cannot be brought close to the set temperature.
[0005]
[Means for Solving the Problems]
  The invention of claim 1 includes a heat exchange part, a combustion part for supplying combustion heat to the heat exchange part, a hot water supply pipe passing through the heat exchange part, and a detecting means for detecting the flow of water in the pipe. In the hot water supply apparatus provided with the control means for supplying hot water by executing combustion in the combustion section in response to detection of the water flow by the detection means, the control means is configured to detect the water flow from the water flow detection state by the detection means. At the time of switching to the detection state, that is, at the time of hot water supply stop, the total combustion heat amount is determined according to the information of the combustion status at the time of hot water supply, and continuous combustion is performed from the hot water supply stop time until the total combustion heat amount is reached. To do.
[0007]
  Claim2The invention of claim1In the hot water supply apparatus described above, the information on the combustion state at the time of hot water supply includes one or both of the amount of combustion heat per unit time and the set temperature.
  Claim3The invention of claim1In the hot water supply apparatus according to claim 1, the combustion section has a plurality of combustion regions that can be controlled independently of combustion, and the information on the combustion state at the time of hot water supply indicates the number of combustion regions in the combustion state at the time of hot water supply. The control means includes a total number corresponding to the number of combustion regions when hot water supply is stopped.Combustion heatIs calculated.
  Claim4The invention of claim 1 to claim 13In the hot water supply apparatus according to any one of the above, the control means corresponds to the outside air temperature, and is adapted for the continuous combustion.Total combustion heatIt is characterized by determining.
  Claim5The invention of claim 1 to claim 14In the hot water supply apparatus according to any one of the above, the pipe includes a heat receiving pipe that passes through the heat exchange section, a water supply pipe and a hot water supply pipe connected to an inlet and an outlet of the heat receiving pipe, respectively, and a water supply pipe in parallel with the heat receiving pipe And a bypass pipe connected to the hot water supply pipe, and the control means corresponds to the incoming water temperature that enters the hot water supply pipe from the water supply pipe through the bypass pipe.Total combustion heatIt is characterized by determining.
  The invention of claim 6 includes a heat exchange part, a combustion part for supplying combustion heat to the heat exchange part, a hot water supply pipe passing through the heat exchange part, and a detecting means for detecting the flow of water in the pipe. In the hot water supply apparatus comprising a control means for performing hot water supply by executing combustion in the combustion section in response to detection of the water flow by the detection means, the control means is configured to detect a water flow from a water flow detection state by the detection means. At the time of switching to the non-detection state, that is, at the time of hot water supply stop, the continuous combustion time is calculated according to the information on the combustion status at the time of hot water supply, and the amount of combustion heat per predetermined unit time from the hot water supply stop time by this continuous combustion time The combustion information at the time of hot water supply includes one or both of the amount of combustion heat per unit time and the set temperature.
  The invention of claim 7 includes a heat exchange part, a combustion part for supplying combustion heat to the heat exchange part, a hot water supply pipe passing through the heat exchange part, and a detecting means for detecting the flow of water in the pipe. In the hot water supply apparatus comprising a control means for performing hot water supply by executing combustion in the combustion section in response to detection of the water flow by the detection means, the control means is configured to detect a water flow from a water flow detection state by the detection means. At the time of switching to the non-detection state, that is, at the time of hot water supply stop, the continuous combustion time is calculated according to the information on the combustion status at the time of hot water supply, and the amount of combustion heat per predetermined unit time from the hot water supply stop time by this continuous combustion time The control means determines the continuous combustion time at the time of the continuous combustion corresponding to the outside air temperature.
  The invention of claim 8 includes a heat exchanging part, a combustion part for supplying combustion heat to the heat exchanging part, a hot water supply pipe passing through the heat exchanging part, and a detecting means for detecting the flow of water in the pipe. In the hot water supply apparatus comprising a control means for performing hot water supply by executing combustion in the combustion section in response to detection of the water flow by the detection means, the control means is configured to detect a water flow from a water flow detection state by the detection means. At the time of switching to the non-detection state, that is, at the time of hot water supply stop, the continuous combustion time is calculated according to the information on the combustion status at the time of hot water supply, and the amount of combustion heat per predetermined unit time from the hot water supply stop time by this continuous combustion time The above piping is connected to the heat receiving pipe passing through the heat exchange section, the water supply pipe and the hot water supply pipe connected to the inlet and the outlet of the heat receiving pipe, respectively, and the water receiving pipe and the hot water supply pipe in parallel with the heat receiving pipe. Connected buy And a scan line, said control means also supports the incoming water temperature entering the hot water supply pipe through the bypass pipe from the water supply pipe, and determines the continuous burning time at the continuous burning.
  Claim9The invention of claim1-4, 4, 7In the hot water supply apparatus according to any one of the above, the pipe includes a heat receiving pipe that passes through the heat exchange section, a water supply pipe and a hot water supply pipe connected to an inlet and an outlet of the heat receiving pipe, respectively, and a water supply pipe in parallel with the heat receiving pipe And a bypass pipe connected to the hot water supply pipe, and the bypass pipe is provided with a bypass valve, and the control means detects the water flow from the heat exchange section when the detection means detects a water flow. The bypass valve is controlled corresponding to the temperature or the elapsed time since the previous hot water supply stop.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hot water supply device has a large combustion capacity (for example, No. 32), and has a large heat capacity heat exchange unit 10 having a large number of fins 11, and the heat exchange unit 10 generates a combustion heat amount. It has the combustion part 20 (heat generation part) to supply. The combustion unit 20 has three combustion regions 21, 22 and 23. The gas supply pipe 30 has a main pipe part 35 and three branch pipe parts 31, 32, 33 branched from the main pipe part 35. The main pipe portion 35 is provided with a main on-off valve 45 and a proportional valve 46, and the branch pipe portions 31, 32, 33 are provided with sub-open / close valves 41, 42, 43, respectively.
[0009]
A pipe 50 for hot water supply includes a heat receiving pipe 51 that passes through the heat exchanging unit 10, a water supply pipe 52 connected to the inlet end of the heat receiving pipe 51, and a hot water supply pipe 53 connected to the outlet end of the heat receiving pipe 51. Have. The hot water supply pipe 53 is provided with a water amount control valve 54, and a hot water tap 55 is provided at the downstream end thereof. Further, the pipe 50 has two bypass pipes 56 and 57 in parallel with the heat receiving pipe 51. Connection points between the bypass pipe 56 closer to the heat exchange unit 10, the water supply pipe 52, and the hot water supply pipe 53 are indicated by P1 and P2. Further, connection points between the bypass pipe 57 far from the heat exchanging unit 10, the water supply pipe 52, and the hot water supply pipe 53 are indicated by P3 and P4. The bypass pipe 57 is provided with a bypass valve 58 composed of an electromagnetic opening / closing valve.
[0010]
In the water supply pipe 52, the incoming water temperature T_INWater temperature sensor TH for detecting water_INIs provided. Further, the hot water supply pipe 53 has a temperature T of hot water from the outlet of the heat exchange unit 10 between the heat exchange unit 10 and the connection point P2._OUTOutlet temperature sensor TH_OUTIs provided. Further, the hot water supply pipe 53 has a tapping temperature T on the downstream side of the connection point P4._MIXHot water temperature sensor TH for detecting_MIXAnd a flow sensor FL (detection means for detecting the water flow) for detecting the amount of water flowing through the pipe 50, that is, the amount of tapping water.
[0011]
The hot water supply apparatus further includes a control unit 60 (control means) including a microcomputer, and a user set temperature T_SAnd a remote controller 65 for sending the information. The control unit 60 controls the set temperature T_S, And the detected temperature T_IN, T_OUT, T_MIXBased on the detected flow rate from the flow sensor FL, the ignition mechanism, the valves 41, 42, 43, 45, 46 for supplying the gas, the water amount control valve 54, and the bypass valve 58 are controlled.
[0012]
The hot water supply apparatus includes a bath retreat pipe that passes through the heat exchanging unit 10, a hot water pipe that extends from the hot water supply pipe 53 to the bath retreat pipe, and the like. Since it is not, illustration is omitted.
[0013]
In the hot water supply apparatus configured as described above, the control unit 60 executes a control routine shown in FIG. More specifically, it is determined whether or not the flow rate detected by the flow sensor FL has exceeded a very low threshold value, in other words, whether the user has opened the hot water tap 55 and water is flowing through the pipe 10. (Step 101). Wait until an affirmative decision is made here. When the determination is affirmative, the combustion lamp is turned on to execute hot water supply control (step 102). In this hot water supply control, first, the main on-off valve 45 and at least one sub on-off valve 41 to 43 are opened and an ignition operation is performed to start combustion in the combustion unit 20. The flow rate detected by the flow sensor FL and the temperature sensor TH_INWater temperature T detected at_INAnd user set temperature T set by remote controller 65_SThe feedforward control component is calculated based on the temperature sensor TH_MIXTapping temperature T detected in_MIXAnd set temperature T_SThe feedback control component is calculated based on Based on the control value obtained by adding the feedback control component to the feedforward control component, the tapping temperature T_MIXIs set temperature T_SThus, the amount of supplied gas, that is, the amount of combustion heat per unit time is controlled.
[0014]
More specifically, when the required amount of combustion heat per unit time is small, the sub-open / close valve 41 corresponding to one combustion region 21 is opened in the combustion unit 20 and the other sub-open / close valves 42 and 43 are kept closed. Thus, combustion is performed only in the combustion region 21 (one-sided combustion). In this state, by controlling the proportional valve 46, the supply gas amount, and thus the combustion heat amount per unit time, are continuously controlled up to the first upper limit value.
When the requested amount of combustion heat per unit time exceeds the first upper limit value, the two sub-open / close valves 41 and 42 are opened to perform combustion in the combustion regions 21 and 22 (two-sided combustion). Then, by controlling the proportional valve 46, the supply gas amount is controlled steplessly within a range up to the second upper limit value.
When the requested amount of combustion heat per unit time exceeds the second upper limit value, combustion is performed in the combustion regions 21 to 23 by opening all the sub on-off valves 41 to 43 and controlling the proportional valves 46. Thus, the amount of supplied gas is controlled steplessly within a range up to the third upper limit value, that is, the maximum combustion capacity.
[0015]
If the required amount of combustion heat per unit time exceeds the maximum combustion capacity, the water amount control valve 54 is throttled to suppress the amount of hot water to an amount commensurate with the maximum combustion capacity.
The bypass valve 58 is open in normal hot water supply control, but is closed when the set temperature is very high, for example, 60 ° C. or higher. The opening timing of the bypass valve 58 at the initial stage of hot water supply control will be described later.
[0016]
In the next hot water supply control, in the next step 103, until it is determined that the flow rate detected by the flow sensor FL is lower than the threshold value, that is, when the user closes the hot water tap 55, the water flow is not detected and it is determined that the hot water supply has stopped. Continue until When it is determined in step 103 that the water flow is not detected, the process proceeds to step 104. Here, it is determined whether or not the three-side combustion was performed during the hot water supply control. When an affirmative determination is made here, the main on-off valve 45 and the sub on-off valves 41 to 43 are closed to immediately stop the combustion state (zero aftercombustion combustion time). In the case of three-sided combustion, since a sufficient amount of combustion heat is imparted to the heat exchange unit 10 and the heat storage amount is large, even if the heat capacity (mass) of the heat exchange unit 10 is large, sufficient post-boiling can be expected. This is because the temperature can be set to a predetermined temperature or higher (for example, 60 ° C. or higher) after one minute.
[0017]
When a negative determination is made in step 104 above, that is, when it is determined that the one-side combustion state or the two-side combustion state, firstly, the combustion lamp is turned off to give the user a sense of security that the appliance is operating normally. , Afterfire state, afterfire combustion time t₀(Continuous combustion time) is calculated (step 105). This afterfire combustion time t₀Is set corresponding to the number of combustion regions. When it is determined that the one-side combustion state is present, the after-burning combustion time t is greater than when the two-side combustion state is determined.₀Becomes longer. For example, in the case of the one-side combustion state, the time is 0.8 seconds, and in the case of the two-side combustion state, the time is 0.5 seconds.
[0018]
Afterfire combustion time t₀T_OUT(Or T_S). In other words, we want to keep the temperature after 1 minute within a certain temperature range._OUTT is low₀T_OUTT is high₀It is preferable to decrease the value. T_OUTT is high₀However, since the unit of time (1/100 second) becomes smaller and control becomes difficult, T_OUTIf NO is high in step 103, the proportional valve is set to the minimum opening and t₀It is preferable to count.
[0019]
Next, the afterfire combustion time t₀Only the combustion state is continued (step 106). In the present embodiment, in the case of two-sided combustion during hot water supply combustion control, the second upper limit value or a predetermined supply gas amount (combustion heat amount per predetermined unit time) is set in the two-sided combustion state as it is, Continue to extend combustion. Further, in the case of one-side combustion at the time of hot water supply control, the auxiliary on-off valve 32 is opened to make a two-side combustion state, and the combustion is continued to be extended with the predetermined supply gas amount. As is clear from this explanation, in the case of one-side combustion or two-side combustion at the time of hot water supply control, the amount of combustion per unit time applied to the heat exchanging unit 10 is small and the amount of stored heat is small, so the after boiling is small. However, since this afterfire combustion is performed and the amount of combustion heat is added to the hot water staying in the heat exchanging section 10, the temperature of the staying hot water can be raised to a predetermined temperature or higher (60 ° C or higher). is there. There is a difference in the amount of heat stored in the heat exchanging unit 10 between the case of single-sided combustion and the case of two-sided combustion during hot water supply control.₀And, as a result, the total amount of combustion heat applied in the afterfire combustion is made different, so that the temperature of the staying hot water in the heat exchanging unit 10 is made equal at the end of the afterfire combustion or at a predetermined time, for example, 1 minute thereafter. can do.
[0020]
In the case of two-sided combustion during hot water supply, afterfire combustion may be performed by two-sided combustion in the same manner as described above, and in the case of one-sided combustion during hot water supply, afterfire combustion may be performed with one-sided combustion. However, in the case of one-side combustion during hot water supply, it is a matter of course that the combustion time is made longer than that in the above example, and the total amount of heat of combustion due to afterfire combustion is increased compared to the case of two-side combustion during hot water supply.
[0021]
The after-fire combustion control is performed at a set time t.₀When it is determined that the time has elapsed (step 107), the process is terminated (step 108), and the process returns to the standby state of step 101. When the user opens the hot-water tap 55 again, an affirmative determination is made at step 101 and hot-water supply control (step 102) is started.
The temperature of the accumulated hot water in the heat exchanging unit 10 described above gradually decreases due to heat dissipation, but if the resumption of hot water supply is within a predetermined time, for example, within 5 minutes, a sufficiently warm temperature is maintained. Warm staying hot water can be discharged from the hot water tap 55. Therefore, the user can enjoy the hot water only after having to endure the low temperature hot water or the water only for a very short time at the beginning of the hot water supply, that is, the time until the staying hot water reaches the hot water tap 55.
[0022]
Next, control in the initial stage of hot water supply, particularly control of the bypass valve 58 will be described in detail. Before describing the control of the bypass valve 58, the mixing of hot water from the heat exchange unit 10 and water from the bypass pipes 56 and 57 will be described in advance. In a state where the bypass valve 58 is closed, the mixing ratio of hot water from the heat exchange unit 10 and water from the bypass pipe 56 is X: (1-X).
Therefore, tapping temperature T_MIXCan be expressed as:
T_MIX= T_OUT・ X + T_IN(1-X) (1)
In the state where the bypass valve 58 is open, the mixing ratio of hot water from the heat exchange unit 10 and water from the two bypass pipes 56 and 57 is Y: (1-Y).
Therefore, tapping temperature T_MIXCan be expressed as:
T_MIX= T_OUT・ Y + T_IN(1-Y) (2)
Of course, Y <X, and in this embodiment, Y = 0.45 and X = 0.7.
[0023]
As a result of the post-boiling and after-burning combustion, the temperature of the staying hot water peaks, for example, when 1 minute has passed since the hot water supply was stopped, and then gradually decreases due to heat dissipation. In this embodiment, the staying hot water in the heat exchange unit 10 is at a temperature close to the set temperature even when about 5 minutes have elapsed since the hot water supply was stopped. At the start of hot water supply, the accumulated hot water in the heat exchange unit 10 is discharged from the outlet temperature sensor T._OUTDetect with. This outlet temperature T_OUT(Still water temperature) and set temperature T_SAnd incoming water temperature T_INBased on the above, it is determined whether or not the bypass valve 58 is opened early. That is, based on the above formulas (1) and (2), the tapping temperature T_MIXExpect. And set temperature T_SExpected hot water temperature T nearer_MIXSelect. In other words, whether to open or close the bypass valve 58 is selected. When the bypass valve 58 is opened, the bypass valve 58 is opened early (that is, before the time when the accumulated hot water first reaches the connection point P4). As a result, the actual hot water temperature immediately after the start of hot water supply is set to the set temperature T._SCan be approached.
[0024]
Explaining with an example, the temperature T of the accumulated hot water at the start of hot water supply_OUTIs 55 ° C and the incoming water temperature T_INIs 20 ° C and set temperature T_SIs 40 ° C, expected hot water temperature T based on equation (1)_MIXIs 44.5 ° C, and the expected tapping temperature T based on equation (2)_MIXIs 39.25 ° C. Set temperature T_SIs close to the expected hot water temperature T based on equation (2)._MIXTherefore, in this case, the bypass valve 58 is opened at the above timing.
Set temperature T under the same conditions_SWhen the temperature is 43 ° C, the set temperature T_SIs close to the expected hot water temperature T based on equation (1)._MIXTherefore, in this case, the bypass valve 58 is not opened at the above timing, and all the accumulated hot water is discharged from the hot-water tap 55 and the bypass valve 58 is opened after the hot water temperature is stabilized. In this case, the supply gas amount is increased in advance prior to the opening operation of the bypass valve 58.
[0025]
The present invention is not limited to the above embodiment, and various forms can be adopted. For example, when the hot water supply is stopped, how much the total combustion heat amount due to the afterburning combustion is determined according to more precise information on the combustion state, for example, the actual combustion heat amount (supply gas amount) immediately before the hot water supply stop. It may be determined steplessly. That is, the smaller the actual amount of hot water supply combustion heat per unit time, the greater the total amount of heat generated by afterfire combustion. The amount of combustion heat per unit time may be obtained from the opening / closing information of the auxiliary opening / closing valves 41 to 43 and the opening information of the proportional valve 46, or may be calculated from the set temperature, the incoming water temperature, and the amount of hot water. In this way, it is possible to make the temperature of the accumulated hot water constant at a predetermined time, for example, 1 minute after the hot water supply is stopped, with higher accuracy. When the total heat of combustion is determined, afterfire combustion is performed until the determined total heat of heat is reached (in other words, in a limited time) by time integration of the heat of combustion per unit time. Although the amount of combustion heat per unit time can be determined arbitrarily, it may always be constant, or may be the amount of combustion heat per unit time when hot water supply is stopped. When the amount of combustion heat per unit time due to afterfire combustion is always constant, instead of the total amount of combustion heat, the afterfire combustion time is determined directly, and afterfire combustion is performed for this determined afterfire combustion time. To do.
Similarly, whether or not to perform afterfire combustion may be determined based on the actual amount of hot water combustion heat per unit time. For example, when the hot water combustion heat quantity is higher than the threshold value, no afterfire combustion is performed (zero aftercombustion combustion time). When the hot water combustion heat quantity is lower than the threshold value, afterfire combustion is performed according to the hot water combustion heat quantity as described above. .
[0026]
Further, how much the total combustion heat amount or the afterfire combustion time due to the afterfire is set may be determined according to other combustion conditions, for example, the user set temperature, or according to the user set temperature and the hot water combustion heat amount. May be determined. That is, the higher the user set temperature, the greater the total combustion heat amount and the longer the afterfire combustion time.
[0027]
Moreover, you may determine how much the total combustion calorie | heat amount by the afterfire or the afterfire combustion time is made according to either one or both of hot water supply combustion calorie | heat amount, user setting temperature, and external temperature. That is, the lower the outside air temperature is, the more the total amount of heat generated by the afterburning combustion is increased, or the afterburning combustion time is lengthened to compensate for the heat radiation.
[0028]
Further, in the case where the hot water supply pipe 50 includes the bypass pipe 56, in addition to any one, two, or all of the hot water combustion heat quantity, the user set temperature, and the outside air temperature, the incoming water temperature sensor TH._INWater temperature T detected by_INCorresponding to the above, it may be determined how much the total combustion heat amount or the afterfire combustion time by the afterfire is set. That is, the incoming water temperature T_INThe lower the is, the more the total amount of heat generated by the after-burning combustion is increased, and the time for the after-burning combustion is lengthened to compensate for the decrease in the temperature of the hot water due to the mixing of hot and cold water.
[0029]
The selection of opening / closing in the initial stage of hot water supply control of the bypass valve 58 is performed by comparing the above when the expected hot water temperature based on the formula (1) exceeds the upper limit temperature higher than the set temperature by a predetermined temperature, for example, 3 ° C. The opening operation at the initial stage of the bypass valve 58 may be determined to ensure safety, or when the expected hot water temperature based on the formula (2) is lower than the lower limit temperature that is lower than the set temperature by a predetermined temperature, for example, 3 ° C. May decide to close the bypass valve 58 in the initial stage without making the above comparison, and may pursue convenience.
[0030]
When selecting the opening and closing of the bypass valve 58 in the initial stage of hot water supply, the outlet temperature sensor TH_OUTThe temperature of staying hot water may be predicted from the amount of combustion heat (supply gas amount) when hot water supply is stopped, the outside air temperature, and the elapsed time from hot water supply stop to hot water supply restart.
The selection of opening and closing of the bypass valve 58 may be performed based only on the elapsed time from the stop of hot water supply to the reheating of hot water. For example, if a predetermined time, for example, 3 minutes has elapsed, the bypass valve 58 is opened at the initial stage of hot water supply, and if 3 minutes have elapsed, the bypass valve 58 is closed at the initial stage of hot water supply.
The bypass valve 58 may be closed in principle when hot water is supplied, and may be opened as necessary only in the initial stage.
[0031]
Instead of the on-off type bypass valve, a water amount control type bypass valve, for example, a bypass valve whose opening degree can be adjusted steplessly by driving a gear motor may be used. In this case, the outlet temperature T at the initial stage of hot water supply_OUTAnd incoming water temperature T_INBy adjusting the opening degree of the bypass valve according to this, the tapping temperature can be made closer to the set temperature.
[0032]
In FIG. 1, the bypass pipe 57 and the bypass valve 58 may be omitted, and water from the bypass pipe 56 and hot water from the heat exchange unit 10 may be mixed. In this case, the hot / cold water mixing ratio is constant. Further, the bypass pipes 56 and 57 may be omitted.
In particular, in the case of a hot water supply apparatus with a large combustion capacity, afterfire combustion may be performed unconditionally, or afterfire combustion may be performed so that a constant total combustion heat amount is obtained regardless of the combustion state at the time of hot water supply. Good.
The remote controller 65 is provided with a combustion lamp, and when performing hot water combustion and afterfire combustion, this combustion lamp may be turned on, or provided with combustion lamps corresponding to hot water combustion and afterfire combustion, The corresponding combustion may be displayed by lighting.
[0033]
【The invention's effect】
  As explained above, claim 1, 6According to this invention, the hot water discharge characteristic at the time of resuming hot water supply can be improved by heating the heat exchanging portion for a limited time continuously after the hot water supply is stopped. In addition, by performing continuous combustion according to the combustion state at the time of hot water supply, it is possible to stabilize the hot water discharge characteristics when hot water supply is resumed.
  Claim7According to this invention, by performing the continuous combustion considering the heat radiation from the hot water supply stop, the hot water discharge characteristic at the time of restarting the hot water supply can be further stabilized.
  Claim8According to this invention, by performing the continuous combustion in consideration of the mixing of water from the bypass pipe, it is possible to further stabilize the hot water discharge characteristic when the hot water supply is resumed.
  Claim9According to this invention, by controlling the bypass valve when hot water supply is resumed, the effect of the continuous combustion can be more effectively utilized to obtain the hot water characteristics preferred by the user.
[Brief description of the drawings]
FIG. 1 is a schematic view of a hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a control routine executed by the hot water supply apparatus.
[Explanation of symbols]
10 Heat exchange section
20 Combustion section
21-23 Combustion region
50 Piping for hot water supply
51 Heat receiving pipe
52 Water supply pipe
53 Hot water supply pipe
56,57 Bypass pipe
58 Bypass valve
60 Control unit (control means)
FL flow sensor (detection means)

Claims (9)

A heat exchange section, a combustion section for supplying combustion heat to the heat exchange section, a hot water supply pipe passing through the heat exchange section, a detection means for detecting the flow of water in the pipe, and a water flow in the detection means In a hot water supply apparatus provided with control means for performing hot water supply by executing combustion in the combustion section in response to detection,
The control means determines the total amount of combustion heat according to the information on the combustion state at the time of hot water supply at the time when the water flow detection state by the detection means is switched to the water flow non-detection state, that is, at the time of hot water supply stop. A hot water supply device that performs continuous combustion until the total amount of heat of combustion is reached. The hot water supply apparatus according to claim 1 , wherein the information on the combustion state at the time of hot water supply includes one or both of the amount of combustion heat per unit time and the set temperature. The combustion section has a plurality of combustion regions that can be controlled independently, and the information on the combustion state at the time of hot water supply includes information on the number of combustion regions in the combustion state at the time of hot water supply, and the control The hot water supply apparatus according to claim 1 , wherein the means calculates a total amount of heat of combustion corresponding to the number of combustion regions at the time of stopping hot water supply. The hot water supply apparatus according to any one of claims 1 to 3 , wherein the control means determines a total amount of heat of combustion at the time of the continuous combustion in correspondence with an outside air temperature. The pipe includes a heat receiving pipe passing through the heat exchange section, a water supply pipe and a hot water supply pipe connected to the inlet and the outlet of the heat receiving pipe, respectively, and a bypass pipe connected in parallel to the heat receiving pipe and the water supply pipe and the hot water supply pipe. With
It said control means also supports the incoming water temperature entering the hot water supply pipe through the bypass pipe from the water supply pipe, according to any one of claims 1 to 4, characterized in that to determine the total amount of combustion heat at the time of the continuous burning Water heater. A heat exchange section, a combustion section for supplying combustion heat to the heat exchange section, a hot water supply pipe passing through the heat exchange section, a detection means for detecting the flow of water in the pipe, and a water flow in the detection means In a hot water supply apparatus provided with control means for performing hot water supply by executing combustion in the combustion section in response to detection,
  The control means calculates a continuous combustion time according to information on a combustion state at the time of hot water supply when the water flow detection state by the detection means is switched from a water flow detection state to a water flow non-detection state, that is, at the time of hot water supply stop. During this continuous combustion time, continuous combustion is performed with a predetermined amount of combustion heat per unit time,
The hot water supply apparatus characterized in that the information on the combustion state at the time of hot water supply includes one or both of the heat of combustion per unit time and the set temperature. A heat exchange section, a combustion section for supplying combustion heat to the heat exchange section, a hot water supply pipe passing through the heat exchange section, a detection means for detecting the flow of water in the pipe, and a water flow in the detection means In a hot water supply apparatus provided with control means for performing hot water supply by executing combustion in the combustion section in response to detection,
  The control means calculates a continuous combustion time according to information on a combustion state at the time of hot water supply when the water flow detection state by the detection means is switched from a water flow detection state to a water flow non-detection state, that is, at the time of hot water supply stop. During this continuous combustion time, continuous combustion is performed with a predetermined amount of combustion heat per unit time,
  The said control means determines the continuous combustion time at the time of the said continuous combustion corresponding to external temperature, The hot water supply apparatus characterized by the above-mentioned. A heat exchange section, a combustion section for supplying combustion heat to the heat exchange section, a hot water supply pipe passing through the heat exchange section, a detection means for detecting the flow of water in the pipe, and a water flow in the detection means In a hot water supply apparatus provided with control means for performing hot water supply by executing combustion in the combustion section in response to detection,
  The control means calculates a continuous combustion time according to information on a combustion state at the time of hot water supply when the water flow detection state by the detection means is switched from a water flow detection state to a water flow non-detection state, that is, at the time of hot water supply stop. The amount of combustion heat per unit time for this continuous combustion time Continue burning at
The pipe includes a heat receiving pipe passing through the heat exchange section, a water supply pipe and a hot water supply pipe connected to the inlet and the outlet of the heat receiving pipe, respectively, and a bypass pipe connected in parallel to the heat receiving pipe and the water supply pipe and the hot water supply pipe. With
  The said control means determines the continuous combustion time at the time of the said continuous combustion corresponding to the incoming water temperature which enters into a hot water supply pipe through a bypass pipe from a water supply pipe, The hot water supply apparatus characterized by the above-mentioned. The pipe includes a heat receiving pipe passing through the heat exchange section, a water supply pipe and a hot water supply pipe connected to the inlet and the outlet of the heat receiving pipe, respectively, and a bypass pipe connected in parallel to the heat receiving pipe and the water supply pipe and the hot water supply pipe. The bypass pipe is provided with this bypass pipe,
When the water flow is detected by the detection means, the control means controls the bypass valve in accordance with the temperature of the hot water coming out of the heat exchange unit or the elapsed time since the previous hot water supply stop. The hot water supply device according to any one of claims 1, 2 , 3 , 4 , 6 , and 7 .

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