JP2001311555A - Hot water supply equipment for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hot water supply equipment for a bath which makes it possible to prevent boiling even with supply of a minute amount of hot water during a reheating combustion control process. SOLUTION: In the hot water supply equipment for the bath, a control means executes a single interruption process or a combined interruption process when it detects the amount of flowing more than a set amount of interruption on the basis of the information on detection of a hot water supply amount detecting means 13 in the course of the reheating combustion control process. When it detects the flowing of hot water in an amount less than the set amount for interruption on the basis of the information on detection of the detecting means 13 in the course of the above process, the control means controls the combustion of a burner 4 so that the temperature of the hot water heated by the burner 4 be a low-temperature reheating target temperature lower than a reheating target temperature and executes a low-temperature reheating combustion control process wherein the hot water is supplied through a hot water supply passage 2 and also supplied into a bathtub 15 through a reheating passage 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating water supplied from a hot water supply path by heating water supplied through a water supply path by burning a burner, and the water supplied through the water supply path. A bypass that bypasses a heat exchanger and supplies the hot water to the hot water supply path, and is connected to the hot water supply path upstream of a connection point of the bypass to supply hot water heated by the burner into the bathtub; An additional heating path, a thermal state detecting means for detecting a thermal state of hot water before being heated by the burner, a hot water supply detecting means for detecting a flow rate of hot water supplied through the hot water supply path, Control means for controlling combustion, wherein the control means heats a part of the water supplied through the water supply path by the burner, Mix with water Hot water supply combustion control processing for controlling the combustion of the burner so that the temperature of the hot water reaches the hot water supply target temperature and supplying hot water through the hot water supply path, and while heating the entire amount of water supplied through the water supply path by the burner. Controlling the combustion of the burner so that the temperature of the hot water heated by the burner reaches the target temperature of the additional heating, based on the detection information of the thermal state detecting means, so that the hot and cold water enters the bathtub through the additional heating path. During the additional combustion control process, based on the detection information of the hot water supply amount detection means, when a flow rate equal to or more than an interrupt set amount is detected, the additional combustion control is performed. A single interrupt process for switching from the process to the hot water supply combustion control process, or the burner of the burner so that the temperature of hot water heated by the burner becomes the interrupt target temperature. And controls the burn, as well as hot water through the hot water supply passage, to a bath water heater that is configured to perform a combination interrupt process supplies hot water into the bathtub through the additional heating channel.

[0002]

2. Description of the Related Art A bath water heater as described above executes a hot water combustion control process as shown in FIG.
A part of the water supplied through the water supply channel 1 is supplied to the heat exchanger 3, heated by the combustion of the burner 4, mixed with the heated hot water and the water from the bypass 6, and passed through the hot water supply channel 2. By supplying hot water to the hot-water tap 2a or opening the reheating valve 18 to execute the reheating combustion control process,
The entire amount of water supplied through the water supply channel 1 is supplied to the heat exchanger 3, heated to the reheating target temperature (for example, 90 ° C.) by burning the burner 4, and the heated hot water is supplied through the reheating channel 14. It is configured to be supplied into the bathtub 15 and refired. Then, during the additional heating combustion control process, by opening a hot water tap 2a or the like connected to the hot water supply path 2, the flow rate of hot water in the hot water supply path 2 is interrupted by the interrupt sensor 13 as a hot water supply amount detecting means. When the amount becomes equal to or more than the amount, by executing the single interruption process or the combined interruption process, the hot water supply to the hot water tap 2a is given priority over the additional heating in the bathtub 15, or the additional heating and the hot water supply are performed simultaneously.

[0003] Also, during the reheating combustion control processing, the hot water supply path 2
When the interruption sensor 13 detects the flow of hot water of less than the interrupt set amount by opening the hot water tap 2a or the like connected to a small amount, the water supplied through the water supply passage 1 is partially removed. The burner 4 is supplied to the heat exchanger 3 and the remaining part is caused to flow through the bypass 6 so that the temperature of the hot water heated by the burner 4 becomes the reheating target temperature (for example, 90 ° C.). To supply hot water mixed by mixing hot water heated by the burner 4 and water from the bypass path 6 through the hot water supply path 2, and to supply hot water heated by the burner 4 through the additional heating path 14 to a bathtub. 15.

[0004]

However, in the above bath water heater, when the hot water supply amount detecting means detects the flow of hot water less than the interrupt set amount during the reheating combustion control processing, heat exchange is performed. Although the amount of water supplied to the vessel is reduced, the combustion of the burner is controlled so that the temperature of the hot water heated by the burner reaches the reheating target temperature (for example, 90 ° C.). There was a risk of boiling in the exchanger.

[0005] In addition, in the reheating combustion control process, the entire amount of water supplied through the water supply passage is heated by the burner. When the opening operation is performed and a small amount of hot water that is less than the interrupt setting amount flows through the hot water supply path, a part of the water supplied through the water supply path is supplied to the hot water path through the bypass path, and the remaining part is supplied to the heat exchanger. And the amount of water supplied to the heat exchanger is reduced.
Therefore, if the combustion of the burner is controlled such that the temperature of the hot water heated by the burner reaches the reheating target temperature (for example, 90 ° C.) even though the amount of water supplied to the heat exchanger is reduced, the heat There was a risk that the temperature of the water supplied to the exchanger would rise sharply and boil.

The present invention has been made in view of such a point, and an object thereof is to provide a bath water heater capable of preventing boiling even if a small amount of hot water is supplied during the reheating combustion control process. The point is to provide.

[0007]

According to the first aspect of the present invention, there is provided a water heater for heating water supplied through a water supply passage by burning a burner and supplying hot water from the hot water supply passage. Heat exchanger, a bypass path for supplying water supplied through the water supply path to the hot water path by bypassing the heat exchanger, and connected to an upstream side of a connection point of the bypass path in the hot water path. And a reheating path for supplying hot and cold water heated by the burner into the bathtub, a heat state detecting means for detecting a hot state of the hot water before being heated by the burner, and hot water supplied through the hot water supply path. Hot water supply amount detecting means for detecting a flow rate of hot and cold water, and control means for controlling combustion of the burner, wherein the control means heats a part of the water supplied through the water supply path by the burner. While the bar A hot water supply combustion control process for controlling the combustion of the burner so that the temperature of the mixed hot and cold water heated by the hot water and the water from the bypass becomes the hot water supply target temperature and supplying hot water through the hot water supply passage; and While heating the entire amount of water supplied through the water supply passage, the burner is controlled so that the temperature of the hot water heated by the burner becomes the additional heating target temperature based on the detection information of the thermal state detecting means. Controlling the combustion of, and performing a reheating combustion control process of supplying hot water to the bathtub through the reheating passage, during the reheating combustion control process, based on the detection information of the hot water supply amount detection means, When a flow rate equal to or greater than the interrupt set amount is detected, a single interrupt process for switching from the reheating combustion control process to the hot water supply combustion control process, or hot water heated by the burner Controlling the combustion of the burner such that the temperature of the burner reaches the interrupt target temperature, supplying hot water through the hot water supply path, and executing a combined interrupt processing of supplying hot water into the bathtub through the additional heating path. In the bath water heater, when the control means detects the flow of hot water of an amount less than the interrupt set amount based on the detection information of the hot water supply amount detecting means during the additional heating combustion control processing, Controlling the combustion of the burner so that the temperature of the hot water heated by the burner becomes a low-temperature reheating target temperature lower than the reheating target temperature, supplying hot water through the hot water supply channel, and bathtub through the reheating channel. It is configured to execute a low-temperature additional firing combustion control process for supplying hot water to the inside.

That is, if a small amount of hot water that is less than the set interrupt amount flows through the hot water supply path during the reheating combustion control process, the low temperature reheating combustion control process can be executed. In addition, the target temperature in the combustion of the burner is lowered from the target reheating temperature to a lower temperature of lower reheating, and the mixed hot water mixed with the water heated to the lower temperature of reheating and the water from the bypass passage is supplied. Hot water is supplied through the passage, and hot water at the low-temperature reheating temperature can be supplied into the bathtub through the reheating passage. Therefore, by supplying a small amount of hot water through the hot water supply path during the reheating combustion control process, even if the amount of water supplied to the heat exchanger decreases, the temperature of the hot water heated by the burner does not boil. It has become possible to provide a bath water heater capable of lowering the temperature to a level that can prevent boiling even if a small amount of hot water is supplied during the reheating combustion control process.

According to the second aspect of the present invention, the bypass path is branched into a plurality of bypass path portions.
An on-off valve is provided corresponding to all or a part of the plurality of bypass passage portions to open and close the installed bypass passage portions, and a hot water supply temperature setting means for changing and setting the hot water supply target temperature is provided. In the hot water supply combustion control process, the control means determines a relationship between a hot water supply target temperature set by the hot water supply temperature setting means and an open / close state of the on-off valve, and sets a preset hot water supply target temperature and the open / close state. The on-off valve is controlled to open and close so as to have a relationship with the open / close state of the valve.

That is, if the amount of water from the bypass changes, the temperature of the mixed hot water mixed with the hot water heated by the burner and the water from the bypass changes, and the temperature of the mixed hot water is changed to the target hot water supply temperature. In order to achieve this, the amount of water from the bypass is controlled, but the relationship between the hot water supply target temperature actually set by the hot water supply temperature setting means and the open / close state of the on-off valve is a predetermined relationship. By simply controlling the open / close state of the on-off valve so that the temperature of the hot water supplied by mixing the hot water heated by the burner and the water from the bypass passage can be set to the hot water supply target temperature. In addition, in order to control the amount of water from the bypass path, it is conceivable to provide a water proportional valve that adjusts the amount of water flowing through the bypass path. However, there is a disadvantage that the cost is increased. Therefore, according to the second aspect of the present invention, the control for setting the temperature of the mixed hot water obtained by mixing the hot water heated by the burner and the water from the bypass passage to the target hot water supply temperature while reducing the cost. Can be facilitated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bath water heater according to the present invention will be described with reference to the drawings. As shown in FIG. 1, this bath hot water supply apparatus supplies hot water to a hot water supply path 2 while heating water supplied from a water supply path 1, and the hot water supply section K
And a main remote controller R1 and a bath remote controller R2 for instructing the control section H to give operation information.

The hot water supply section K includes a heat exchanger 3 for heating water supplied to the hot water supply path 2 while heating water supplied through the water supply path 1, and a gas combustion type heat exchanger for heating the heat exchanger. The hot water supply path 2 is connected to a hot water tap or a shower, and FIG. 1 shows a case where a hot water tap 2a is connected. In addition, a bypass 6 for supplying water supplied through the water supply channel 1 to the hot water supply channel 2 bypassing the heat exchanger 3 is provided.
The water supply passage 1 is provided so as to communicate downstream of the water supply thermistor 9 with the check valve 5 and the water proportional valve 11 in the hot water supply passage 2 to be described later.

The bypass 6 has a plurality of bypass passages 6 including a small bypass passage 6a through which a small amount of water flows and a large bypass passage 6b through which a large amount of water flows.
a and 6b, which are branched into a small amount
An electromagnetic small-volume bypass on-off valve 7a for opening and closing the valve a and an electromagnetic large-volume bypass on-off valve 7b for opening and closing the large-volume bypass passage portion 6b are provided. That is, the electromagnetic bypass on-off valve 7 that is installed in all of the plurality of bypass passage portions 6a and 6b and opens and closes the installed bypass passage portions 6a and 6b is provided.

The water supply path 1 is provided with a water amount sensor 8 for detecting the amount of water supplied through the water supply path 1 and a water supply thermistor 9 for detecting the temperature of water supplied through the water supply path 1. From the side, a water amount sensor 8 and a water supply thermistor 9 are provided in this order. The hot water supply path 2 includes a hot water supply thermistor 10 for detecting the temperature of hot water heated by the burner 4, a check valve 5, a water proportional valve 11 for adjusting the amount of hot water supplied through the hot water supply path 2, and a burner 4. Mixing thermistor 12 for detecting the temperature of a mixture of hot and cold water and water from bypass 6, and a hot water supply detecting means for detecting a flow rate of hot water supplied to hot water tap 2 a through hot water supply passage 2. The hot water supply thermistor 10, the check valve 5, the water proportional valve 11, the mixing thermistor 12, and the interrupt sensor 13 are provided in this order from the upstream side of the hot water supply path 2.

In the hot water supply path 2, the hot water heated by the burner 4 is supplied into the bathtub 15 between the hot water supply thermistor 10 and the check valve 5 on the upstream side of the connection point of the bypass path 6. The additional heating path 14 is connected, the other end of the additional heating path 14 is connected to the inside of the bathtub 15, a bath adapter 16 is attached to the front of the opening, and inside the bath adapter 16, A bathtub temperature thermistor 17 for detecting the temperature of hot water in the bathtub 15 is provided. The reheating path 14 is provided with a reheating valve 18 and a vacuum breaker 19 for adjusting the amount of hot water flowing through the reheating path 14, and the reheating valve 1 is provided from the upstream side of the reheating path 14.
8, vacuum breakers 19 are provided in this order.

A hot water path 20 for supplying mixed hot water mixed with hot water heated by the burner 4 and water from the bypass path 6 into the bathtub 15 includes a mixing thermistor 12 and an interrupt sensor 13 in the hot water path 2. Is connected with the additional heating valve 18 and the vacuum breaker 19 in the additional heating path 14, and is connected to the inside of the bathtub 15 in a state where a part of the additional heating path 14 is shared. The hot water path 20 is provided with an electromagnetic hot water opening / closing valve 21 for opening and closing the hot water path 20.

The burner 4 is a multi-stage burner, which is connected to a gas supply passage 22 for supplying fuel gas for general household in three branches, and a gas switching electromagnetic valve 23 is connected to each gas supply passage 22. An electromagnetic gas proportional valve 24 for adjusting the fuel gas supply amount, a source gas electromagnetic valve 25 for interrupting the supply of the fuel gas, and the like are provided in the gas supply passage 22 upstream of the branch point. Further, a fan F for supplying combustion air to the burner 4 is also provided, and an ignition plug 2 for performing an ignition operation for the burner 4 is provided near the burner 4.
6. A frame rod 27 for detecting whether or not the burner 4 has been ignited is provided.

The operation of such a bath water heater is controlled by a controller H, and a main remote controller R1 and a bath remote controller R2 for giving a control command to the controller H are wirelessly or wiredly connected. It is connected. The main remote control R1 is installed in a kitchen or the like,
As shown in FIG. 2A, an operation switch 28 for instructing the start and stop of the operation, a hot-water switch 29 for instructing a hot water filling operation to the bathtub 15, and a hot water supply target temperature to be supplied through the hot water supply path 2 are set. A hot water temperature setting switch 30 as hot water temperature setting means, a display unit 31 for displaying a hot water target temperature and the like are provided. By the way, when the operation switch 28 is turned on and the bath water heater is in the operable state, the lamp of the operation switch 28 is turned on, and when the hot water switch 29 is turned on and the bathing operation is being performed, the hot water is turned on. The lamp of the beam switch 29 is configured to light up.

As shown in (b) of FIG. 2, the bath remote controller R2 has an operation switch 32, a hot water switch 33, a hot water switch 34 for instructing a hot water operation, and a warm water for instructing a warm operation. A switch 35, a hot switch 36 for instructing a hot operation, a warming switch 37 for instructing a warming operation, a hot water temperature setting switch 38 for setting a hot water setting temperature, and a display unit 3 for displaying a hot water supply target temperature and the like.
9 and the like. By the way, the lamp of the hot water switch 33 is lit when the hot water is running, the light of the hot water switch 34 is lit when the hot water is running, and the light of the soft switch 35 is light when the hot water is running. The lamp of the hot switch 36 is turned on when a hot operation is being performed, and the warming lamp of the display unit 39 is configured to be turned on when the warming operation is being performed. When the bath water heater is supplying hot water, ON operations of various switches for commanding the operation of the hot water switches 29 and 33 and the hot water switch 34 are not accepted.

The control section H is provided with a microcomputer, and operates on the basis of control commands from the main remote controller R1 and the bath remote controller R2 to supply hot water at a target hot water temperature through the hot water supply path 2; Filling operation by supplying hot water at the set temperature to the hot water,
Insulation operation for keeping the temperature of hot water in the bathtub 15 at the hot water setting temperature, hot operation for supplying hot water at the reheating target temperature to the bathtub 15 and reheating, adding hot water of the hot water setting temperature to the bathtub 15 A hot water operation in which a set amount of hot water is supplied and a hot water operation is performed, and a warm operation in which a set amount of water is supplied to the bathtub 15 to warm the bathwater at a temperature lower than the hot water setting temperature to lubricate the hot water in the bathtub 15. Is configured to execute the operation.

Hereinafter, each operation will be described. The hot water supply operation is executed when the water amount sensor 8 detects the passage of water to the heat exchanger 3 in response to the opening operation of the hot water tap 2a in a state where the operation switch 28 of the main remote control R1 is turned on and the burner is turned on. While heating a part of the water supplied through the water supply path 1 at 4, the burner is adjusted so that the temperature of the mixed hot water of the hot water heated by the burner 4 and the water from the bypass path 6 becomes the hot water supply target temperature. 4 is configured to execute a hot water supply combustion control process for supplying hot water through the hot water supply path 2 by controlling the combustion of the hot water supply 4.

The operation of the hot water supply operation will be specifically described. First, the fan F is driven to rotate, the original gas solenoid valve 25 and the gas switching valve 23 are opened, and the gas proportional valve 24 is set to the moderate ignition gas amount. , The ignition is performed by the ignition plug 26, and the ignition processing for confirming the ignition by the flame rod 27 is executed, and the hot water supply combustion control processing is executed. More specifically, the hot water supply combustion control process will be described. Heating is performed by the burner 4 based on the water amount detected by the water amount sensor 8, the water temperature detected by the water supply thermistor 9, and the hot water supply target temperature by the hot water temperature setting switch 30 of the main remote controller R1. The amount of gas required to bring the mixed hot and cold water and the water from the bypass 6 to the target hot water supply temperature is calculated, and the gas switching solenoid valve 23 is appropriately switched so that the required gas amount is attained. While adjusting the opening of the proportional valve 24 and the rotation speed of the fan F, finely adjusting the opening of the gas proportional valve 24 and the rotation speed of the fan F so that the temperature detected by the mixing thermistor 12 becomes the hot water supply target temperature, If the temperature detected by the mixing thermistor 12 is less than the hot water supply target temperature even when the burner 4 is burned to the maximum, the water proportional valve So as to control so that the hot water target temperature by throttling one.

The relationship between the hot water supply target temperature by the hot water supply temperature setting switch 30 and the open / close state of the bypass on-off valve 7 is as follows.
The open / close state of the bypass on-off valve 7 is controlled so that the preset hot water supply target temperature and the open / close state of the bypass on-off valve 7 are related. More specifically, when the hot water supply target temperature is 37 to 43 ° C., the small amount bypass opening / closing valve 7a and the large amount bypass opening / closing valve 7b are opened, and when the hot water supply target temperature is 44 to 50 ° C., only the large amount bypass opening / closing valve 7b is provided. And the hot water supply target temperature is 60 ° C
At this time, only the small amount bypass on-off valve 7a is opened. Incidentally, the relationship between the preset hot water supply target temperature and the open / close state of the bypass on-off valve 7 is such that the mixed hot water mixed with the hot water heated by the burner 4 and the water from the bypass passage 6 becomes the hot water supply target temperature. Is set in advance as follows.

In this way, a part of the water supplied through the water supply passage 1 is heated by the heat exchanger 3, and the hot water heated by the heat exchanger 3 is mixed with the water from the bypass passage 6. The hot water is supplied through the hot water supply path 2. And
When the water amount sensor 8 stops detecting the flow of water to the heat exchanger 3 as the hot water tap 2a is closed, the gas switching solenoid valve 23, the gas proportional valve 24, and the original gas solenoid valve 25 are closed. After the combustion of the burner 4 is stopped, when the set time elapses, the driving of the fan F is also stopped to end the hot water supply operation.

The hot water operation is executed when the hot water switch 29 of the main remote control R1 or the hot water switch 33 of the bath remote control R2 is turned on. First, the hot water opening / closing valve 21 is opened and the burner 4 is turned on. While heating a part of the water supplied through the water supply passage 1 so that the temperature of the mixed hot water of the hot water heated by the burner 4 and the water from the bypass passage 6 becomes the filling temperature. 4 is controlled so that hot water is supplied into the bathtub 15 through the hot water path 20 to fill the hot water.

More specifically, the operation of the hot water filling operation will be described. Similar to the above-described hot water supply operation, after performing the ignition process, the hot water heated by the burner 4 and the water from the bypass 6 are mixed. The amount of gas required to bring the mixed hot water to the filling temperature is calculated, the gas switching electromagnetic valve 23 is appropriately switched, the opening of the gas proportional valve 24 and the rotation speed of the fan F are adjusted, and the detection by the mixing thermistor 12 is performed. The opening degree of the gas proportional valve 24 and the rotation speed of the fan F are finely adjusted so that the temperature reaches the filling temperature, and hot water at the filling temperature is supplied into the bathtub 15. As for the opening / closing control of the bypass on-off valve 7, similarly to the above-described hot water supply operation, the relationship between the hot water setting temperature and the open / close state of the bypass on-off valve 7 is based on the preset hot water filling temperature and bypass on-off valve. When the hot water setting temperature is 37 to 43 ° C., the small-volume bypass on-off valve 7
a and the large-volume bypass on-off valve 7b are opened, and when the hot water setting temperature is 44 to 48 ° C., only the large-volume bypass on-off valve 7b is opened.

In this way, the hot water at the hot water setting temperature is supplied into the bathtub 15 and when the integrated water amount of the water amount sensor 8 reaches the hot water setting for hot water, the hot water opening / closing valve 21 is closed.
After closing the gas switching electromagnetic valve 23, the gas proportional valve 24, and the original gas electromagnetic valve 25 to stop the combustion of the burner 4, the drive of the fan F is also stopped when a set time has elapsed, and the filling operation is completed. I am trying to do it. During the hot water filling operation, the hot water tap 2a is opened, and the interrupt sensor 13
When the detected flow rate becomes equal to or greater than the interrupt set amount, the hot water opening / closing valve 21 is closed, the hot water operation is put on standby, and the above hot water supply operation is executed. To resume.

The hot water operation is executed when the hot water switch 34 of the bath remote controller R2 is turned on.
The hot water on-off valve 21 is opened, and the water supply channel 1 is
Control of combustion of the burner 4 so that the temperature of the mixed hot water of the hot water heated by the burner 4 and the water from the bypass 6 becomes the hot water set temperature while heating a part of the water supplied through the burner 4 Then, hot water is supplied into the bathtub 15 through the hot water path 20.

The operation of the hot water operation will be specifically described. Similar to the hot water supply operation described above, after performing the ignition process, the hot water heated by the burner 4 and the water from the bypass 6 are mixed. The amount of gas required to bring the mixed hot and cold water to the filling temperature is calculated, the gas switching solenoid valve 23 is appropriately switched, the opening of the gas proportional valve 24 and the rotation speed of the fan F are adjusted, and the mixing thermistor 12 is used. The opening degree of the gas proportional valve 24 and the rotation speed of the fan F are finely adjusted so that the detected temperature becomes the hot water setting temperature, and hot water at the hot water setting temperature is supplied into the bathtub 15. As for the opening / closing control of the bypass on-off valve 7, similarly to the above-described hot water supply operation, the relationship between the hot water setting temperature and the open / close state of the bypass on-off valve 7 is based on the preset hot water filling temperature and bypass on-off valve. When the hot water setting temperature is 37 to 43 ° C., the small-volume bypass on-off valve 7
a and the large-volume bypass on-off valve 7b are opened, and when the hot water setting temperature is 44 to 48 ° C., only the large-volume bypass on-off valve 7b is opened.

In this way, hot water is supplied to the bathtub 15 at the set hot water temperature, and when the integrated water amount of the water amount sensor 8 reaches the set hot water amount (for example, 20 liters), the hot water opening / closing valve 21 is opened. After the valve was closed and the gas switching solenoid valve 23, the gas proportional valve 24, and the original gas solenoid valve 25 were closed to stop burning the burner 4, the drive of the fan F was also stopped after a lapse of a set time. The hot water operation is terminated. When the hot water tap 2a is opened during the hot water operation and the flow rate detected by the interrupt sensor 13 exceeds the interrupt set amount, the hot water opening / closing valve 21 is closed and the hot water operation is made to wait. The hot water supply operation is performed, and when the hot water supply operation is completed, the hot water supply operation is restarted.

The hot operation is executed when the hot switch 36 of the bath remote controller R2 is turned on, and while the burner 4 heats the entire amount of water supplied through the water supply passage 1, the water amount as the heat state detecting means is increased. Based on the detection information of the sensor 8 and the water supply thermistor 9, the combustion of the burner 4 is controlled so that the temperature of the hot water heated by the burner 4 reaches the target temperature of the additional heating, and the burner 4 enters the bathtub 15 through the additional heating path 14. A supplementary combustion control process for supplying hot and cold water is executed.

The operation of the hot operation will be described in detail. First, the additional heating valve 18 is opened, an ignition process is executed in the same manner as in the above-described hot water supply operation, and then the additional combustion control process is executed. . That is, based on the water amount detected by the water amount sensor 8 and the water temperature detected by the water supply thermistor 9, the amount of gas necessary for reheating the hot water heated by the burner 4 to the target temperature (for example, 90 ° C.) is calculated. The gas switching solenoid valve 23 is appropriately switched so as to attain the required gas amount, the opening degree of the gas proportional valve 24 and the rotation speed of the fan F are adjusted, and the hot water heated by the burner 4 is reheated to the target temperature (for example, , 90 ° C.), and the additional heating valve 18 is opened to fix the opening degree.

As described above, while the entire amount of water supplied through the water supply passage 1 is heated by the heat exchanger 3, the hot water heated by the heat exchanger 3 is put into the bathtub 15 through the additional heating passage 14. When the temperature of the hot and cold water in the bathtub 15 detected by the bathtub temperature thermistor 17 reaches a set temperature, the reheating valve 18 is closed and the gas switching solenoid valve 2 is turned on.
3. After closing the gas proportional valve 24 and the original gas solenoid valve 25 to stop the combustion of the burner 4, the drive of the fan F is also stopped when a set time has elapsed to end the hot operation. .

During the reheating combustion control process, that is, during the hot operation, if a flow rate equal to or larger than the interrupt set amount is detected based on the detection information of the interrupt sensor 13, the reheating combustion control process is switched to the hot water supply combustion control process. It is configured to execute a single interrupt process for switching. Specifically, during hot operation, the hot water tap 2a
Is operated, and when the amount of hot water supplied through the hot water supply path 2 detected by the interrupt sensor 13 becomes greater than or equal to the interrupt set amount, the additional heating valve 18 is closed to wait for the hot operation, and the above-described operation is performed. By executing the hot water supply operation, a part of the water supplied through the water supply passage 1 is heated by the heat exchanger 3, and the hot water heated by the heat exchanger 3 is mixed with the water from the bypass passage 6. Hot water is supplied through the hot water supply path 2. Then, when the hot-water tap 2a is closed and the hot-water supply operation is completed, the hot operation is restarted.

In addition, during the reheating combustion control processing, if the flow of hot water of an amount less than the interrupt set amount is detected based on the detection information of the interrupt sensor 13, the temperature of the hot water heated by the burner 4 is reduced. The combustion of the burner 4 is controlled so that the low-temperature reheating target temperature (for example, 80 ° C.) is lower than the reheating target temperature, hot water is supplied through the hot water supply path 2, and hot and cold water is supplied into the bathtub 15 through the reheating path 14. It is configured to execute the supplied low-temperature reheating combustion control process.

More specifically, during the hot operation, the hot water tap 2a is slightly opened and the interrupt sensor 13
When the flow of a small amount of hot water that is less than the interrupt set amount is detected in the above, based on the water amount detected by the water amount sensor 8 and the water temperature detected by the water supply thermistor 9, the hot water heated by the burner 4 is subjected to the low-temperature reheating target temperature ( For example, the required gas amount for achieving 80 ° C.) is calculated, the gas switching solenoid valve 23 is appropriately switched so that the required gas amount is obtained, and the gas proportional valve 2
4 and the rotation speed of the fan F are adjusted so that a portion of the hot and cold water heated by the heat exchanger 3
4 and into the bath 15, and the remaining part is mixed with water from the bypass 6 and supplied through the hot water supply 2. When the hot water tap 2a is closed and the flow of hot water is not detected by the interrupt sensor 13, the hot operation is restarted.

In this way, if a small amount of hot water less than the set interrupt amount flows through the hot water supply path during the reheating combustion control process, the low temperature reheating combustion control process can be executed. By supplying a small amount of hot water through the hot water supply path during the control process, even if the amount of water supplied to the heat exchanger decreases, the temperature of the hot water heated by the burner is reduced to a temperature that does not cause boiling. Thus, it is possible to provide a bath water heater capable of preventing boiling even if a small amount of hot water is supplied during the reheating combustion control process.

The low-temperature reheating target temperature in the above-mentioned low-temperature reheating combustion control process does not boil even when the hot and cold water supplied to the heat exchanger 3 is heated by the burner 4 to the low-temperature post-heating target temperature. At such a temperature, the temperature is set such that hot water with a low-temperature reheating target temperature can be supplied into the bathtub 15 and refired.

The warm operation is executed when the warm switch 35 of the bath remote controller R2 is turned ON.
The hot water opening / closing valve 21 is opened, and the water supplied through the water supply passage 1 is supplied into the bathtub 15 through the hot water passage 20 without heating. The operation of the warm operation will be specifically described.
1 is opened, the water supplied through the water supply channel 1 is supplied into the bathtub 15 through the water filling channel 20 without being heated by the burner 4, and the integrated water volume of the water volume sensor 8 is set to the set lubricating water volume (for example, (10 liters), the hot water opening / closing valve 21 is closed to end the warm operation. Also, when the hot-water tap 2a is opened during the warm operation and the detected flow rate of the interrupt sensor 13 becomes equal to or greater than the interrupt set amount, the hot water opening / closing valve 21 is closed to wait for the warm operation, and the above-described operation is performed. The hot water supply operation is performed, and when the hot water supply operation is completed, the warm operation is restarted.

The warming operation is executed when the warming switch 37 of the bath remote controller R2 is turned ON. When the detected temperature of the bath tub temperature thermistor 17 is lower than the set temperature for starting the additional heating, the additional heating valve 18 is turned on. After the valve is opened, the above-described reheating combustion control process is executed, hot water of the reheating target temperature is supplied into the bathtub 15, and when the detected temperature of the bathtub temperature thermistor 17 reaches the hot water setting temperature, the reheating combustion control is performed. The processing is configured to stop. And the heat retention switch 37
When a set time (for example, 4 hours) elapses after the is turned ON, the warm-up operation is ended.

When the hot-water tap 2a is opened during the warm-up operation and the flow rate detected by the interrupt sensor 13 exceeds the interrupt set amount, the additional heating valve 18 is closed to wait for the warm-up operation. The above-described hot water supply operation is performed, and when the hot water supply operation is completed, the warming operation is restarted. Then, during the warm-up operation, when the hot-water tap 2a is slightly opened, and the interruption sensor 13 detects the flow of a very small amount of hot water less than the interruption set amount, the interruption to the burner 4 is performed in the same manner as the above-described hot operation. Target temperature (for example, 8) where the temperature of the hot and cold water is lower than the target temperature
The temperature of the burner 4 is controlled so as to be 0 ° C. so that hot water is supplied through the hot water supply path 2 and hot water is supplied into the bathtub 15 through the additional heating path 14. If the warm switch 35 or the hot switch 36 is turned ON during the warm-up operation, the warm operation described above is performed.
Alternatively, the hot operation is executed with priority.

The operation of the control unit H will be described with reference to the flowchart of FIG. 3. When the operation switch 28 of the main remote controller R1 and the operation switch 32 of the bath remote controller R2 are turned on, the hot water tap 2a is turned on. When the water amount sensor 8 detects the passage of water to the heat exchanger 3 in accordance with the opening operation, the hot water supply operation is executed (steps 1 and 2), and the hot water switch 29 and the bath remote control R of the main remote control R1 are executed.
When the second hot water switch 33 is turned ON, the hot water filling operation is executed (steps 3 and 4).

When the hot water switch 34 is turned on, the hot water operation is executed (steps 5 and 6), and when the hot switch 36 is turned on, the hot operation is executed (steps 7 and 7). 8) When the warm switch 35 is turned on, the warm operation is performed (steps 9 and 10), and when the warm switch 37 is turned on, the warm operation is performed (steps 11 and 12).

The operation of the hot water supply operation will be described with reference to the flowchart of FIG. 4. In the early stage of the hot water supply operation, the bypass opening / closing valve 7 is opened so that hot water is not supplied due to post-boiling or the like. When the water sensor 8 detects a water amount equal to or higher than the initial set amount, the detected temperature of the water supply thermistor 9 is equal to or lower than the initial set temperature, and the interrupt sensor 13 detects the flow of hot water equal to or higher than the initial flow amount, the bypass switch An initial process for closing the valve 7 is executed (step 21). Then, after performing the ignition process to ignite the burner 4, the hot water supply combustion control process is performed, and a part of the water supplied through the water supply passage 1 is heated by the heat exchanger 3, and the heat exchanger 3 The hot water and the water heated in the step are mixed with the water from the bypass passage 6 and supplied through the hot water supply passage 2 (steps 22 and 23).

In this manner, the hot water combustion control process is continued until the water flow sensor 8 stops detecting the flow of water to the heat exchanger 3 with the operation of closing the hot water tap 2a. When the passage of water to the exchanger 3 is no longer detected, the gas switching solenoid valve 23, the gas proportional valve 24, and the original gas solenoid valve 25 are closed to stop burning the burner 4, and after a set time elapses. Stop processing for stopping the drive of the fan F is also executed to end the hot water supply operation (steps 24 and 25).

The operation of the hot operation will be described with reference to the flow chart of FIG. 5. First, the temperature of the hot water heated by the burner 4 is set to the reheating target temperature (for example, 9
(0 ° C.), the reheating valve 18 is opened and its opening is fixed, the ignition process is executed to ignite the burner 4, and then the reheating combustion control process is executed (steps 31 to 31).
33). Then, the bathtub temperature is detected by the bathtub temperature thermistor 17, and when the bathtub temperature is below the bathing set temperature -2 ° C, the bathing set temperature is set as the hot set temperature, and the bathtub temperature is set at the bathing set temperature -2 ° C. If it is higher, the hot water setting temperature + 2 ° C is set as the hot setting temperature (steps 34 to 36). The setting of the hot set temperature is performed only once during the hot operation. Once the hot set temperature is set, the hot set temperature is not set thereafter.

In this manner, the hot set temperature is set, and in a state where the flow of hot water is not detected by the interrupt sensor 13, the reheating combustion is performed until the bath tub temperature by the bath tub temperature thermistor 17 exceeds the hot set temperature. When the control processing is continued and the bath tub temperature by the bath tub temperature thermistor 17 becomes higher than the set temperature while the flow of hot water is not detected by the interrupt sensor 13 during the reheating combustion control processing, the reheating valve 18 And the gas switching solenoid valve 23,
After the combustion of the burner 4 is stopped by closing the gas proportional valve 24 and the original gas solenoid valve 25, a stop process for stopping the drive of the fan F is performed when a set time has elapsed, so that the hot operation is ended. (Steps 37, 43, 4
4). In addition, even if the bathtub temperature by the bathtub temperature thermistor 17 does not become higher than the set temperature, when the integrated amount of the water amount sensor 8 becomes larger than the maximum amount (for example, 100 liters), the stop process is executed, and the burner 4 is abnormal. If the temperature of the hot water in the bathtub 15 does not become higher than the set temperature due to, for example, a large amount of hot water is supplied into the bathtub 15 and
5 prevents abnormalities such as hot water overflow.

Then, during execution of the reheating combustion control process,
When the flow rate of hot water is detected by the interrupt sensor 13 and the flow rate of the hot water is equal to or greater than the interrupt set amount, a single interrupt process is executed, a hot operation is made to wait, and a hot water supply operation is performed. The single interruption process is continued until the hot water supply operation by the process is completed (steps 37 to 40). During the execution of the reheating combustion control process, the flow of hot water is detected by the interrupt sensor 13, and if the flow of the hot water is a small amount less than the interrupt set amount, the low temperature reheating combustion control process is executed. Then, the low-temperature reheating combustion control process is continued until the flow of hot water is not detected by the interrupt sensor 13 (steps 37, 38, 41, 42).

[Another Embodiment] (1) In the above embodiment,
During the additional combustion control process, when the interrupt sensor 13 detects a flow rate equal to or greater than the interrupt set amount, an independent interrupt process for switching from the additional combustion control process to the hot water combustion control process is performed. Instead of the single interruption processing, the combustion of the burner 4 is controlled so that the temperature of the hot water heated by the burner 4 becomes the interruption target temperature, the hot water is supplied through the hot water supply path 2, and the additional heating path 14 is supplied.
It is also possible to execute a combined interruption process for supplying hot water to the bathtub 15 through the CPU. The combined interrupt processing will be described in further detail. Based on the amount of water detected by the water amount sensor 8 and the temperature of water detected by the water supply thermistor 9, the amount of gas required to bring the hot and cold water heated by the burner 4 to the interrupt target temperature is calculated. The gas switching solenoid valve 23 is appropriately switched so as to achieve the required gas amount, and the opening degree of the gas proportional valve 24 and the rotation speed of the fan F are adjusted so that one of the hot and cold water heated by the heat exchanger 3 is removed. The part is supplied into the bathtub 15 through the additional heating path 14, and the remaining part is mixed with water from the bypass path 6 and supplied through the hot water supply path 2.

(2) In the above embodiment, an example is shown in which the bypass 6 is branched into a plurality of bypass sections 6a and 6b. However, the bypass 6 is not branched into a plurality of bypass sections. It is also possible to configure and implement with one bypass path portion. When the bypass 6 is constituted by a single bypass, a switch valve for opening and closing the bypass is provided, and a part of the water supplied through the water supply 1 such as a hot water supply operation or a hot water filling operation is provided. Is allowed to flow through the bypass passage 6, the on-off valve is opened.

(3) In the above embodiment, an example is shown in which the bypass on-off valve 7 is provided in all of the two bypass passage portions 6a and 6b. However, the number of bypass passage portions may be three or more. The on-off valve 7 may be provided in a part of the bypass passage.

(4) In the above embodiment, the bath water heater according to the present invention is applied to a bath water heater that performs a hot water supply operation, a warm operation, a hot water operation, and a warming operation in addition to the hot water supply operation and the hot water operation. Although an example of adaptation is shown, the number and type of operations can be changed as appropriate, such as those that only perform hot water supply operation, hot operation, and hot water filling operation, and a bath water heater that performs hot water supply operation and hot operation can be used. I just need.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bath water heater.

FIG. 2 is a diagram showing a main remote controller and a bath remote controller;

FIG. 3 is a flowchart showing the operation of the bath water heater.

FIG. 4 is a flowchart showing an operation in a hot water supply operation.

FIG. 5 is a flowchart showing an operation in a hot operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply path 2 Hot water supply path 3 Heat exchanger 4 Burner 6 Bypass path 6a, 6b Bypass path part 7 On-off valve 8, 9 Thermal state detection means 13 Hot water supply amount detection means 14 Additional heating path 15 Bathtub 30 Hot water supply temperature setting means H control means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L024 CC18 DD05 DD13 DD16 DD22 EE03 FF02 FF03 FF07 FF12 FF15 GG03 GG04 GG05 GG06 GG24 GG25 GG32 GG33 HH13 HH14 HH19 HH22 HH27

Claims (2)

[Claims] 1. A heat exchanger for heating water supplied from a hot water supply line by heating water supplied through a water supply line by burning a burner, and bypassing the water supplied through the water supply line to the heat exchanger. A re-heating path connected to the hot water supply path upstream of a connection point of the bypass path in the hot water supply path and supplying hot water heated by the burner into a bathtub; Thermal state detecting means for detecting a thermal state of hot water before being heated by the burner; hot water supply amount detecting means for detecting a flow rate of hot water supplied through the hot water supply path; and control means for controlling combustion of the burner. The control means, while heating a part of the water supplied through the water supply path by the burner, mixed hot and cold water of the hot water heated by the burner and the water from the bypass path Temperature is hot water Hot water supply combustion control processing for controlling the combustion of the burner to reach a target temperature to supply hot water through the hot water supply path, and detecting the thermal state while heating the entire amount of water supplied through the water supply path by the burner. On the basis of the detection information of the means, the combustion of the burner is controlled so that the temperature of the hot water heated by the burner reaches the target temperature of the additional heating, and the additional heating for supplying the hot water into the bathtub through the additional heating path. In addition to performing the combustion control process, during the additional heating combustion control process, based on the detection information of the hot water supply amount detection means, if a flow rate equal to or greater than an interrupt set amount is detected, the additional heating combustion control process proceeds to the additional hot water combustion. Independent interrupt processing for switching to control processing, or controlling the combustion of the burner so that the temperature of hot water heated by the burner reaches the interrupt target temperature, A bath water heater configured to execute hot water supply through a hot water supply passage and to execute a combined interruption process of supplying hot and cold water into a bathtub through the additional heating path, wherein the control unit performs the additional heating combustion control processing. In
When the flow of hot water having a volume less than the interrupt set amount is detected based on the detection information of the hot water supply detecting means, the temperature of the hot water heated by the burner is lower than the target temperature of the additional heating. Controlling the combustion of the burner so as to reach the firing target temperature, supplying hot water through the hot water supply path, and performing low-temperature additional firing combustion control processing of supplying hot water to the bathtub through the additional heating path. Bath water heater. 2. The bypass passage is divided into a plurality of bypass passage portions, and is installed corresponding to all or a part of the plurality of bypass passage portions to open and close the installed bypass passage portion. An opening / closing valve is provided; a hot water supply temperature setting means for changing and setting the hot water supply target temperature is provided; and the control means, in the hot water combustion control processing, the hot water supply target temperature set by the hot water supply temperature setting means and the hot water supply target temperature. 2. The on-off valve according to claim 1, wherein the on-off state of the on-off valve is controlled so that the relation between the on-off state of the on-off valve and a preset hot water supply target temperature and the on-off state of the on-off valve. Bath water heater as described.