JP3704568B2 - Hot water heater with high temperature difference hot water function - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot water supply device with a high temperature difference hot water function that performs general hot water supply used for a shower, a wash basin, etc., and automatic hot water supply to a bathtub and high temperature hot water to raise the temperature of the bathtub water by supplying hot water, More specifically, when general hot water supply is performed while high-temperature differential hot water is being supplied to the bathtub, hot water in which cold water bypassing the heat exchanger is mixed with high-temperature hot water is temporarily supplied, and the heat exchanger The present invention relates to a water heater with a high temperature difference hot water function in which the hot water is supplied after the temperature of the hot water is lowered.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, hot water heaters have been used that supply hot water to a shower, a wash basin, a kitchen, a bathtub, and the like at home, and also have a role of raising the temperature of water already stored in the bathtub or warm water. As a method of raising the temperature of the bathtub water, in addition to the so-called reheating, circulating the bathtub water to the heat exchanger and heating it back to the bathtub, hot water of about 80 ° C. is newly supplied to the bathtub, Some are mixed with water to raise the temperature. The temperature raising operation by the latter method is called high temperature hot water, and a water heater having such a function is called a hot water heater having a high temperature hot water function. The hot water heater with a high temperature difference hot water function has an advantage that it does not require the provision of a reheating combustor or a circulation pump because the bath water is not circulated and heated.
[0003]
An example of a conventional water heater with a high temperature difference hot water function is shown in FIG. In FIG. 8, a heat exchanger 62 heated by a gas burner 61 is basically connected to a water inlet pipe 63 and a hot water outlet pipe 64 that receive water supply, and branches from the hot water outlet pipe 64 at a branch point w. And a high-temperature hot water supply pipe 65 provided. And it branches from the branch point y upstream from the connection part x of the 1st bypass path 66 which bypasses the heat exchanger 62 and connects the water intake pipe 63 and the hot water discharge pipe 64, and the 1st bypass path 66 of the hot water supply pipe 64 And a second bypass passage 67 connected to the high temperature hot water supply pipe 65 at the connection portion z.
[0004]
In such a hot water heater with a high temperature difference hot water function, a water inlet thermistor 68 and a flow rate sensor 69 are provided downstream from the branch point of the water inlet pipe 63 with the first bypass passage 66, and a bypass valve 70 is provided in the first bypass passage 66. Flow control valves 72 and 73 and hot water thermistors 74 and 75 are provided between the branch point w and the branch point y of the hot water pipe 64 and the high temperature hot water supply pipe 65, respectively. A check valve 76 is provided between the connecting portion x and the connecting portion x. A general hot water supply pipe 77 having a hot water tap is connected downstream of the hot water supply pipe 64, and a bathtub hot water supply pipe 79 having an electromagnetic opening / closing valve 80 and reaching the bathtub B is connected downstream of the connecting portion z. The gas burner 61 is provided with a gas proportional valve 82.
[0005]
When general hot water is used with this hot water heater with a high temperature difference hot water function, the flow control valve 72 is opened, and the bypass valve 70, the flow control valve 73, and the electromagnetic switching valve 80 are closed. When the hot water tap is opened, the hot water heated to the set temperature of the general hot water by the heat exchanger 62 is discharged through the general hot water supply pipe 77. At this time, the flow rate and the hot water temperature are adjusted by adjusting the opening of the flow rate control valve 72 and the gas proportional valve 82.
When automatically filling the bathtub B, the flow control valve 72 is opened, and the bypass valve 70 and the flow control valve 73 are closed. When the electromagnetic on-off valve 80 is opened, the hot water heated to the set temperature of the hot water supply by the heat exchanger 62 flows through the second bypass passage 67 in the direction of the arrow F1, and further passes through the bathtub hot water supply pipe 79 to the bathtub B. To be supplied. Further, when the hot water tap of the general hot water supply is opened here, since the set temperature is the same or very close between the general hot water supply and the automatic hot water filling, a part of the hot water heated by the heat exchanger 62 is diverted as it is. To be served.
[0006]
In the case where hot water is added to the bathtub B, the flow control valve 73 is opened and the flow control valve 72 is closed. When the electromagnetic on-off valve 80 is opened, the hot water heated to a high set temperature (for example, about 80 ° C.) suitable for the high temperature difference hot water by the heat exchanger 62 passes through the high temperature hot water supply pipe 65 and the bathtub hot water supply pipe 79, and bath B To be supplied. At this time, the bypass valve 70 is also open, but the check valve 76 prevents unheated water from being mixed into the hot water supplied to the bathtub B. Here, when the hot water tap of the general hot water supply is opened, a part of the hot water heated by the heat exchanger 62 is diverted from the connection portion z, flows into the second bypass passage 67, flows in the direction of the arrow F2, and the first The cold water supplied from the bypass passage 66 is merged and diluted at the connection portion x, and discharged from the general hot water supply pipe 77 as hot water of appropriate temperature.
[0007]
[Problems to be solved by the invention]
However, if the flow path to the bathtub B is immediately closed to give priority to the general hot water supply and interrupt the high temperature differential hot water, the entire amount of hot water from the heat exchanger 62 will flow to the general hot water supply pipe side. Even if it is mixed with cold water from the bypass passage 66, the temperature is too high to be supplied to a faucet or the like.
[0008]
[Means for Solving the Problems]
The water heater with a high temperature difference hot water function of the present invention that solves the above problems is as follows.
A heat exchanger connected to the water supply pipe and the hot water pipe and heated by the heating means; a thermal power adjusting means for adjusting the heating power of the heating means; and a tapping temperature detecting means for detecting the temperature of the hot water heated by the heat exchanger; A bypass pipe that bypasses the heat exchanger and connects the hot water supply pipe and the hot water discharge pipe , a hot water bath pipe for supplying hot water of a suitable bath temperature to the bathtub, and a connection between the bypass pipe of the hot water discharge pipe A hot water supply pipe that is branched from the upstream side of the section to supply hot water to the bathtub, a bypass on-off valve that opens and closes the bypass pipe, and a water electromagnetic that is provided in the bathtub hot water pipe and opens when automatically filling the hot water a check valve for preventing and tub hot water off valve with a valve, and high temperature hot water supply on-off valve for opening and closing the high temperature hot water supply pipe, that the water from the bypass pipe to flow into the high temperature hot water supply pipe, the bathtub hot-water supply opening the hot water heater off valve closed And a hot Sayu means the detected temperature of the hot water temperature detecting means opens the bypass valve to control the thermal power adjusting means so that the high-temperature set temperature,
When the use of general hot water is detected in the middle of the high temperature hot water control, the heating power is weakened or stopped by the heating power adjusting means, and then the high temperature hot water on / off valve is closed. The gist is to mix the cold water from the bypass pipe and send it to the general hot water pipe while letting the hot water escape to the high temperature hot water pipe.
[0009]
According to the water heater with a high temperature hot water function of the present invention having such a configuration, if the general hot water is used during the high temperature hot water control, the heating power is weakened or stopped, but the high temperature hot water on / off valve is immediately closed. Therefore, the hot water from the heat exchanger is divided into a high temperature hot water supply pipe and a general hot water supply pipe. For this reason, a part of high-temperature hot water from the heat exchanger is released to the bathtub, and the rest is flowed to the general hot water supply pipe side, mixed with cold water from the bypass pipe, and sent to the general hot water supply pipe. As a result, hot hot water from a faucet or the like is prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, the structure of the hot water heater with a high temperature difference hot water function which concerns on a present Example is shown.
A hot water heater with a high temperature hot water function shown in FIG. 1 includes a heat exchanger 3 in which a water supply pipe 1 and a hot water discharge pipe 2 are piped, a gas burner 4 for heating water flowing through the heat exchanger 3, and a hot water discharge pipe. A hot water pipe 6 that branches from 2 and supplies hot water to the bathtub 41, and a bypass pipe 8 that branches from the hot water pipe 1 and is connected to a position downstream of the branch water b of the hot water pipe 6 of the hot water pipe 2; And a hot water pipe 5 branched from a position upstream from the branching portion b of the hot water pipe 2 with the bathtub hot water pipe 6 and connected to the bathtub hot water pipe 6. Moreover, the general hot water supply pipe 7 which leads to the shower, kitchen, etc. which are not shown in figure is connected downstream from the connection part c with the bypass pipe 8 of the hot water supply pipe 2. FIG.
[0011]
A gas proportional valve 21 for adjusting the flow rate of the fuel gas is provided in the gas burner 4, and a flow rate sensor 10 for detecting the flow rate of the water flow and a maximum water flow rate upstream of the branch portion e with the bypass pipe 8 of the water supply pipe 1. A water governor 9 to be regulated is provided. A bypass water electromagnetic valve 11 is provided in the bypass pipe 8.
[0012]
In addition, a hot water thermistor 12 for measuring the temperature of the hot water from the heat exchanger 3 is provided in the hot water pipe 2 at a position upstream from the branch part a with the hot water pipe 5. A check valve 15 for preventing the water from flowing from the bypass pipe 8 to the bathtub hot water supply pipe 6 is provided at a position between the connection part c and the pipe 8. Further, a hot water supply flow sensor 16 for detecting the presence or absence of a flow and a hot water supply thermistor 17 for measuring a hot water supply temperature are provided at a position downstream of the connection portion c of the hot water discharge pipe 2 with the bypass pipe 8, and is connected to the general hot water supply pipe 7. Has been. Moreover, the 1st water solenoid valve 14 opened when the hot water supply to the bathtub 41 is automatically supplied to the bathtub hot water supply pipe 6, and the second water opened to the hot water pipe 5 when the hot water supply to the bathtub 41 is heated. A solenoid valve 13 and a hot water governor 20 that regulates the maximum flow rate are provided.
[0013]
Further, in response to signals from the flow sensor 10, the hot water thermistor 12, the hot water flow sensor 16 and the hot water thermistor 17, the gas proportional valve 21, the bypass water electromagnetic valve 11, and the first, second and third water electromagnetic valves 13 and 14 are provided. It has a controller 18 to control. The controller 18 includes a known CPU, ROM, RAM, and the like. The ROM of the controller 18 stores various programs for performing hot water supply switching control described later.
The controller 18 includes a remote controller 19. The remote controller 19 can remotely operate the water heater with a high temperature difference hot water function from the bathroom or kitchen. The remote controller 19 also has a display function and an alarm function for displaying the operation status of the hot water heater with a high temperature difference hot water function.
[0014]
Next, the operation of the hot water heater with a high temperature difference hot water function having the above-described configuration will be described. The basic operation of this hot water heater with a high temperature difference hot water function is to heat the water supplied from the water supply pipe 1 with the heat of the gas burner 4 in the heat exchanger 3 to form hot water, and then the difference hot water pipe 5 or the bathtub hot water supply pipe 6. Is supplied to the bathtub 41 or to the faucet or shower through the general hot water supply pipe 7. The switching of the hot water supply is performed by controlling the gas proportional valve 21, the bypass water electromagnetic valve 11, and the first and second water electromagnetic valves 13 and 14 by the controller 18. Hereinafter, each hot water supply operation of automatic hot water filling, high temperature differential hot water, and general hot water supply in this hot water heater with a high temperature differential hot water function will be described with reference to FIGS. 2 to 4, a pipe through which hot water or water flows is represented by a solid line, and a pipe that does not flow is represented by a broken line. Further, the bypass water solenoid valve 11 and the first and second water solenoid valves 13 and 14 are indicated by an open circle and a closed state by a cross.
[0015]
First, a case where hot water having an appropriate bath temperature is automatically filled in an empty bathtub 41 will be described. Automatic hot water filling is performed by instructing the controller 18 to that effect by the remote controller 19 with the faucet or shower closed. In this case, as shown in FIG. 2, the second water solenoid valve 13 is closed, and the first water solenoid valve 14 and the bypass water solenoid valve 11 are opened. For this reason, hot water flows from the heat exchanger 3 to the bathtub 41 through the bathtub hot-water supply pipe 6. When this flow is detected by the flow sensor 10, the gas burner 4 is ignited, and the gas proportional valve 21 is controlled so that the detected water temperature of the hot water thermistor 12 becomes an appropriate bathing temperature set by the remote controller 19, for example, about 42 ° C. . On the other hand, although the bypass water electromagnetic valve 11 is open, the faucet and shower etc. of the general hot water pipe 7 are closed, and the check valve 15 prohibits the flow to the bathtub hot water pipe 6. Water does not flow through the bypass pipe 8.
[0016]
Such automatic hot water filling is performed until a predetermined predetermined integrated flow rate is reached so that it is necessary and sufficient to fill the bathtub 41. When the automatic hot water filling is completed, the first water solenoid valve 14 is closed to stop the hot water supply, and the gas burner 4 is extinguished. In addition, at the start and end of automatic hot water filling, the display function and alarm function of the remote controller 19 are used to notify that effect.
[0017]
Next, a case where there is remaining hot water in the bathtub 41 and the temperature of the remaining hot water is raised by performing high temperature difference hot water will be described. The high temperature difference hot water is performed by instructing the controller 18 to that effect by the remote controller 19 with the faucet, shower, etc. closed as in the case of the automatic hot water filling. In this case, as shown in FIG. 3, the first water electromagnetic valve 14 is closed, and the second water electromagnetic valve 13 and the bypass water electromagnetic valve 11 are opened. For this reason, hot water flows from the heat exchanger 3 through the hot water pipe 5 to the bathtub 41. However, since the hot water governor 20 is provided in the difference hot water pipe 5, the flow rate is smaller than that in the case of automatic hot water filling. The reason why the hot water governor 20 is provided in the hot water pipe 5 is that when a large amount of water flows in the heat exchanger 3, the heating capacity of the gas burner 4 is limited, so that the hot water temperature rises to a level sufficient for high temperature hot water. Because there is no. When this flow is detected by the flow sensor 10, the gas burner 4 is ignited as in the case of automatic hot water filling, and the gas proportional valve 21 is controlled so that the detected water temperature of the tapping thermistor 12 is high, for example, about 80 ° C. The
[0018]
Although the bypass water solenoid valve 11 is open, water does not flow into the bypass pipe 8 for the same reason as in the case of automatic hot water filling. The reason why the bypass water solenoid valve 11 is opened at this time is that, when a faucet or the like is opened in the high-temperature difference hot water, it is dangerous that hot water is poured out as it is, so that it is mixed with cold water and discharged.
Such high temperature difference hot water is performed for a predetermined time. When the high temperature hot water is finished, the second water solenoid valve 13 is closed to stop the hot water supply, and the gas burner 4 is extinguished in the same manner as when the automatic hot water filling is finished. Further, at the start and end of the high temperature hot water, the display function and alarm function of the remote controller 19 are used to notify that effect as in the case of automatic hot water filling.
[0019]
Next, a case where general hot water such as a faucet is used will be described. General hot water is supplied by opening a kitchen faucet or bathroom shower. In this case, as shown in FIG. 4, the bypass water solenoid valve 11, the first and second water solenoid valves 13, 14 are all closed. For this reason, hot water flows from the heat exchanger 3 to the faucet through the general hot water supply pipe 7. At this time, the flow rate sensor 10 and the hot water flow sensor 16 are turned on, the gas burner 4 is ignited by a command from the controller 18, and the gas proportional valve 21 is controlled so that the detected water temperature of the tapping thermistor 12 becomes an appropriate hot water temperature, for example, about 40 ° C. The Note that the temperature control at this time may be performed by the temperature detected by the hot water supply thermistor 17. Further, since the bypass water electromagnetic valve 11 is closed, water does not flow into the bypass pipe 8.
When the faucet or the like is closed, the hot water flow sensor 16 is turned off, and the gas burner 4 is extinguished by a command from the controller 18.
[0020]
In such a hot water heater with a high temperature difference hot water function, when a faucet or the like is opened in the middle of performing the high temperature difference hot water, the high temperature difference hot water is interrupted in preference to the general hot water supply. However, since it is dangerous if the hot water for the high temperature difference hot water comes out from the faucet or the like as it is, it is mixed with the cold water from the bypass pipe 8 and the temperature is lowered and flows into the general hot water supply pipe 7. Then, after the hot water temperature of the heat exchanger 3 is lowered by controlling the gas proportional valve 21, a hot water supply switching routine for closing the bypass water electromagnetic valve 11 is performed by the controller 18. This control will be described with reference to FIGS. FIG. 5 is a flowchart of the control routine. 6 and 7 show the flow of hot water in the transitional state of switching, and the meanings of broken lines, solid lines, circles, and the like are the same as those in FIGS.
[0021]
Whether or not the hot water supply water flow sensor 16 is turned on is monitored whenever the hot water supply with the hot water supply function is performed (S1). Further, since the high temperature hot water is used for a predetermined time as in the previous period, it is also monitored whether or not the hot water has been supplied for the predetermined time (S2). When the hot water for a predetermined time is finished (S2: Yes), the process proceeds to S3, the second water solenoid valve 13 and the bypass water solenoid valve 11 are closed, the gas burner 4 is extinguished in S12, and the control routine is finished.
[0022]
Then, when the faucet or the like is opened during the execution of the hot water, a transient state shown in FIG. That is, the hot water from the heat exchanger 3 is branched into the hot water pipe 5 and the general hot water pipe 7 side of the tapping pipe 2, and the hot water flowing to the general hot water pipe 7 side is mixed with cold water from the bypass pipe 8. The temperature is lowered and flows into the general hot water supply pipe 7. In addition, since the check valve 15 is provided, cold water does not flow into the hot water pipe 5. At this time, since hot water flows through the general hot water supply pipe 7, the hot water flow sensor 16 is turned on (S1: Yes), and the process proceeds to S4. In S4, the opening degree of the gas proportional valve 21 is reduced. This is to lower the temperature of the hot water from the heat exchanger 3 to an appropriate temperature for hot water supply. At this time, the time counting for the high-temperature hot water is stopped. Further, the fact that the high temperature hot water is interrupted is displayed using the display function of the remote controller 19.
[0023]
In S5, it is determined whether or not the hot water temperature (Tx) detected by the hot water thermistor 12 has dropped to a predetermined switching temperature (T1). When the tapping temperature Tx falls to the switching temperature T1 (S5: Yes), the process proceeds to S6. In S6, the second water electromagnetic valve 13 is closed. This is because hot water whose temperature has continued to flow into the bathtub 41 is contrary to the purpose of the hot water. On the other hand, the reason why the second water electromagnetic valve 13 is not immediately closed in S <b> 2 is to allow hot hot water from the heat exchanger 3 to escape to the bathtub 41 side through the second water electromagnetic valve 13. If the total amount of hot water flows to the side of the general hot water supply pipe 7 while the temperature of the hot water discharged from the heat exchanger 3 is too high, the temperature is too high to supply to the faucet etc. even if mixed with the cold water from the bypass pipe 8. It is because it is too much. Therefore, the switching temperature T1 is a temperature (for example, about 60 ° C.) that is lower than the tapping temperature for high temperature hot water (for example, 80 ° C.) and higher than the appropriate hot water supply temperature (for example, about 40 ° C.), and is a value stored in the ROM of the controller 18. is there. It can also be set by the remote controller 19.
[0024]
This transient state is shown in FIG. All the hot water from the heat exchanger 3 flows to the general hot water supply pipe 7, and cold water flows from the bypass pipe 8 to the general hot water supply pipe 7. These are mixed to form hot water and discharged from a faucet.
[0025]
In S7, it is determined whether or not the detected temperature Tx of the hot water thermistor 12 has dropped to a predetermined switching temperature (T2). When the temperature Tx falls to the switching temperature T2 (S7: Yes), the process proceeds to S8. In S8, the bypass water electromagnetic valve 11 is closed. This is because the mixed hot water as shown in the transient state of FIG. 7 has a disadvantage that the temperature cannot be set by the user, and therefore mixing with cold water is not performed after the detected temperature Tx is sufficiently lowered. Therefore, the switching temperature T2 is ideally an appropriate temperature (about 40 ° C.) for general hot water supply. However, if the switching temperature T2 is made completely equal to the appropriate hot water supply temperature, the hot water temperature from the faucet or the like immediately before the bypass water solenoid valve 11 is closed is considerably lower than the appropriate hot water supply temperature. Good.
[0026]
The switching temperature T2 is a value stored in the ROM of the controller 18. It can also be set by the remote controller 19. After the bypass water solenoid valve 11 is closed, hot water flows through the same route as the original general hot water supply shown in FIG. 4, and the temperature can be set by the user.
[0027]
In S9, the hot water temperature is adjusted. That is, the opening degree of the gas proportional valve 21 is adjusted so that the detected water temperature of the hot water thermistor 12 becomes an appropriate hot water supply temperature. In this state, the general hot water supply is continued until the hot water flow sensor 16 is turned off.
When the faucet or the like is closed, the hot water flow sensor 16 is turned off and it is determined Yes in S10. For this reason, it progresses to S11. In S11, it is determined whether or not the interrupted high temperature hot water has remaining time.
When there is a remaining time (S11: Yes), the state returns to the state of the hot water. For this reason, the 2nd water solenoid valve 13 and the bypass water solenoid valve 11 are opened, the gas proportional valve 21 is adjusted, and the hot water temperature is made high. At this time, using the display function and the alarm function of the remote controller 19, the resumption of the hot water is displayed. When there is no remaining time (S11: No), it progresses to S12 and the gas burner 4 is extinguished.
[0028]
This routine is completed. This routine is for the case where the general hot water supply is used in the middle of the high temperature difference hot water, but the same control is executed in principle when the general hot water supply is used in the middle of the automatic hot water supply. However, when the set temperature of the automatic hot water filling is very close to the set temperature of the general hot water supply, the hot water from the heat exchanger 3 may be simply branched and passed through the general hot water supply pipe 7. In that case, it is preferable to close the bypass water solenoid valve 11 in the automatic hot water supply state shown in FIG.
In contrast to this routine, when the remote controller 19 commands the hot water supply or the automatic hot water filling while using the general hot water supply, the command is not accepted because the general hot water supply has priority. Alternatively, the command may be held and the command may be executed after the general hot water supply ends. In this case, the display function and alarm function of the remote controller 19 are used to notify that the command is on hold and executed.
[0029]
Next, a second embodiment will be described. The second embodiment has substantially the same configuration and operation as the first embodiment, but is a modified version of S7 in the hot water supply switching routine described with reference to FIG.
That is, in S7 of the first embodiment, the process proceeds to S8 when the detected water temperature Tx of the hot water thermistor 12 falls to a predetermined switching temperature. In this embodiment, instead of the detected water temperature Tx of the hot water thermistor 12, the hot water supply thermistor. Such a determination is made at a detected temperature Ty of 17. The switching temperature in this case is also ideally suitable for general hot water supply (about 40 ° C.). However, if the switching temperature is made completely equal to the appropriate hot water supply temperature, the hot water temperature from the faucet etc. immediately after the bypass water solenoid valve 11 is closed becomes considerably higher than the optimal hot water supply temperature. Good. The switching temperature is a value stored in the ROM of the controller 18. It can also be set by the remote controller 19.
[0030]
As explained in detail above, in the water heater with a high temperature differential hot water function according to each of the above embodiments, the heat exchanger 3 heats the water to a high temperature, opens the second water electromagnetic valve 13, and supplies the hot water in the bathtub 41. Since the bypass water solenoid valve 11 is opened during the operation, cold water from the bypass pipe 8 is mixed with hot water even when general hot water such as a faucet or shower is used in the middle of hot water. Thus, it is possible to prevent the hot water from flowing into the general hot water supply pipe 7 from the faucet or the like at a high temperature. In addition, since the bypass water solenoid valve 11 is closed after the temperature of the hot water is lowered to a predetermined temperature, the state is the same as that of the normal general hot water supply, and the temperature of the hot water from the faucet or the like is stabilized. Further, the number of necessary valve devices such as the bypass water electromagnetic valve 11 is small, and no flow control valve is used for the hot water pipe. Therefore, the structure is simple and the burden on the controller 18 is small, which is excellent in terms of cost and maintenance. Thus, a hot water heater with a high temperature differential hot water function that is easy to use and safe even when general hot water is used during the use of high temperature differential hot water or the like has been realized at low cost.
[0031]
In addition, the said Example does not limit this invention at all, Of course, various deformation | transformation and improvement are possible in the range which does not deviate from the summary of this invention. For example, the starting point of the hot water pipe 5 may be a position between the branch portion b and the check valve 15 or a position upstream of the first water electromagnetic valve 14 of the bathtub hot water pipe 6. Further, the hot water flow sensor 16 may be provided between the check valve 15 and the connection portion c or in the bypass pipe 8. Further, in S4 of the flow of FIG. 5, the gas burner 4 may be extinguished once, and then re-ignited in S9. In that case, the temperature of the discharged hot water from S5 to S7 decreases more rapidly.
[0032]
【The invention's effect】
As is apparent from the above description, in the hot water heater with a high temperature hot water function according to the present invention, even if general hot water is used during the high temperature hot water control, the hot water hot water on / off valve is not immediately closed. A part of the hot water from the hot water is discharged to the bathtub, and the remaining hot water is mixed with the cold water from the bypass pipe and sent to the general hot water pipe. It is.
Further, it is not necessary to use a flow rate control valve in the hot water pipe, the structure is simple, the burden on the controller is small, and the cost and maintenance are excellent.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a hot water heater with a high temperature hot water function according to an embodiment of the present invention.
FIG. 2 is a view for explaining the flow of hot water in the case where automatic hot water is supplied to a bathtub using this hot water heater with a high temperature difference hot water function.
FIG. 3 is a view for explaining the flow of hot water when hot water is added to a bathtub with this hot water heater with high temperature hot water function.
FIG. 4 is a diagram for explaining the flow of hot water when general hot water is used in the hot water heater with a high temperature difference hot water function.
FIG. 5 is a flowchart in the case of switching from high temperature hot water to general hot water in this hot water heater with a high temperature differential hot water function.
FIG. 6 is a diagram for explaining the flow of hot water in a transition state of switching from high-temperature hot water to general hot water.
FIG. 7 is a diagram for explaining the flow of hot water in a transition state of switching from high-temperature hot water to general hot water.
FIG. 8 is a schematic configuration diagram of a conventional water heater with a high temperature difference hot water function.
[Explanation of symbols]
1 Hot water pipe 2 Hot water pipe 3 Heat exchanger 4 Gas burner 5 Hot water pipe 6 Bath hot water pipe 8 Bypass pipe 11 Bypass water solenoid valve 12 Hot water thermistor 13 Second water solenoid valve 14 First water solenoid valve 15 Check valve 16 Hot water flow Sensor 17 Hot water supply thermistor 18 Controller 20 Hot water governor 21 Gas proportional valve

Claims (1)

A heat exchanger connected to the water supply pipe and the hot water pipe and heated by the heating means; a thermal power adjusting means for adjusting the heating power of the heating means; and a tapping temperature detecting means for detecting the temperature of the hot water heated by the heat exchanger; A bypass pipe that bypasses the heat exchanger and connects the hot water supply pipe and the hot water discharge pipe , a hot water bath pipe for supplying hot water of a suitable bath temperature to the bathtub, and a connection between the bypass pipe of the hot water discharge pipe A hot water supply pipe that is branched from the upstream side of the section to supply hot water to the bathtub, a bypass on-off valve that opens and closes the bypass pipe, and a water electromagnetic that is provided in the bathtub hot water pipe and opens when automatically filling the hot water a check valve for preventing and tub hot water off valve with a valve, and high temperature hot water supply on-off valve for opening and closing the high temperature hot water supply pipe, that the water from the bypass pipe to flow into the high temperature hot water supply pipe, the bathtub hot-water supply opening the hot water heater off valve closed And a hot Sayu means the detected temperature of the hot water temperature detecting means opens the bypass valve to control the thermal power adjusting means so that the high-temperature set temperature,
When the use of general hot water is detected in the middle of the high temperature hot water control, the heating power is weakened or stopped by the heating power adjusting means, and then the high temperature hot water on / off valve is closed. A hot water heater with a high temperature difference hot water function, wherein cold water from a bypass pipe is mixed and sent to a general hot water pipe while letting hot water escape to the high temperature hot water pipe side.

Images