JPH0821653A - Additional heating and temperature keeping device for bath boiler - Google Patents

Abstract

PURPOSE:To mitigate and eliminate uncomfortableness in contact of cold hot-water, cooled in a tube between a bathtub and a bath boiler and discharged into the bathtub upon starting the operation of additional heating and temperature keeping mode, with the body of a bathing person. CONSTITUTION:Upon starting additional heating and temperature keeping operation, the ON/OFF intermittent driving of a circulation pump 8 is effected for a period of time until cold hot-water in a loop route from a bathtub 20 to the bathtub 20 through an additional heating heat exchanger 2 is completely discharged into the bathtub 20. Thereafter, the operation of the circulation pump 8 is switched into continuous operation and the temperature of hot-water in the bathtub is detected by a bath temperature sensor 10 to burn an additional heating burner 3 and effect additional heating and temperature keeping until the temperature of bathtub hot-water arrives at the set temperature of bath when the detected temperature is lower than the set temperature of bath. Upon starting the additional heating and temperature keeping operation, the cold hot-water in the loop route is discharged into the bathtub 20 intermittently by the intermittent driving of the circulation pump 8 and, therefore, the flow speed of the hot-water is lowered and hot-water, warmed by the mixing of hot-water in the bathtub and the cold hot-water, warmed in the loop route, is brought in contact with the body of a bathing person, whereby he will never feel uncomfortableness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath heater reheating heat retaining device having a reheating function for hot water in a bathtub and a heat retaining function after reheating.

[0002]

2. Description of the Related Art FIG. 5 shows a system for installing a bath tub equipped with a conventional general reheating heater. In FIG. 1, a reheating heat exchanger 2 is provided in the instrument case 1, a reheating burner 3 is provided below the reheating heat exchanger 2, and a reheating burner 3 for supplying and exhausting the reheating burner 3 is provided. A combustion fan (not shown) is provided.

A pipe line 4 is connected to the outlet side of the reheating heat exchanger 2, and the outlet side of the pipe line 4 is connected to a connection port 6 protruding to the outside of the instrument case 1. A pipe line 5 is connected to the inlet side of the reheating heat exchanger 2, and the inlet side of the pipe line 5 projects to the outside of the instrument case 1 through a connection port 7
It is connected to the.

In the pipe 5, a circulation pump 8, a bath temperature sensor 10 such as a thermistor for detecting the temperature of the hot water flowing through the pipe 5, and a flowing water as a flowing water sensor for detecting the flow of the hot water flowing in the pipe 5. A switch 15 is provided. The water flow switch 15 outputs an ON signal when detecting the flow of water in the pipe 5.

A reheating circulation passage 16 is formed by the passages of the pipes 4 and 5 and the reheating heat exchanger 2, and the reheating circulation passage 16 is connected to the circulation fittings of the bathtub 20 through the connecting pipe passages 17 and 18.
It is connected to 21 and communicates with bathtub 20.

A control device 22 for controlling the operation of the reheating function in the reheating mode and the heat retention function in the heat retention mode is installed in the equipment case 1. The control device 22 specifies the operation mode of the bathtub. , The remote control 23 for setting the bath temperature is connected.

In this type of bath kettle, when water or hot water is poured into the bathtub 20 and then an operation in the reheating mode is instructed, the circulation pump 8 is driven to reheat the hot and cold water in the bathtub 20 to circulate the water. Cycle through 16. At this time, the running water switch
15 detects the flow of water and applies an ON signal to the controller 22. In response to this ON signal, the control device 22 ignites the reheating burner 3 to perform burner combustion, and the reheating circulation path 16
The hot water that circulates is heated by the combustion heat of the burner when passing through the heat exchanger 2, and the hot water of the bathtub is reheated. During this reheating operation, the bath temperature sensor 10 detects the bath temperature and applies the detection signal to the control device 22, and the control device 22 sets the detected temperature detected by the bath temperature sensor 10 by the remote controller 23. When the set temperature of the bath is reached, the circulation pump 8 is stopped, the combustion of the reheating burner 3 is stopped, the reheating operation is terminated, and the operation in the next heat retention mode is entered.

[0008] In the operation of the heat retention mode, after a lapse of a predetermined time, for example, 30 minutes after the end of the reheating operation, the circulation pump 8 is activated to circulate the hot water in the bathtub through the reheating circulation path 16 to circulate the hot water in the bathtub. And the temperature of the bath water is taken in by the bath temperature sensor 10. When the detected temperature is lower than the bath setting temperature, the reheating burner 3 is burned to reheat the circulating hot water, and when the temperature of the bath water is raised to the bath setting temperature, the circulation pump 8
And the combustion of the reburning burner 3 is stopped. This heat retention operation is performed every predetermined time (for example, 30 minutes), and the operation in the heat retention mode is ended when, for example, 4 hours have elapsed from the start of the heat retention mode.

The above-mentioned heat retention operation provides the convenience that the hot and cold water in the bathtub 20 is kept at the bathable temperature for a long time, but the heat retention operation is started when a person is bathing in the bathtub 20. Therefore, the bath water may be circulated.
However, since the heat retention operation is performed at predetermined intervals (30 minutes), when the heat retention operation starts, the reheating circulation path
The hot and cold water in 16 and the connecting pipes 17 and 18 is cooled to a temperature lower than that of the hot water in the bathtub 20, and therefore, the cold hot water that has been cold immediately after the circulation pump 8 is activated has a large flow velocity and is kept in the bathtub 20. Since the water is discharged into the hot and cold water inside, there is a problem that the bather directly receives this cold, high-velocity hot water on the body and feels uncomfortable.

Recently, a device devised so as to alleviate the discomfort of the cold water discharged into the bath 20 at the initial stage of such a heat retaining operation has been proposed in Japanese Patent Laid-Open No. 10584/1993. In the proposed device, when the circulation pump 8 is started and the running water switch 15 detects running water during the operation in the heat retention mode, the additional heating burner is immediately ignited and burned to prevent cold hot water from entering the bathtub as much as possible. It tries to reduce it.

[0011]

However, in the proposed device, even if the circulating pump 8 is started to detect the flowing water of the flowing water switch 15 to quickly burn the additional heating burner 3, the outlet of the additional heating heat exchanger 2 is discharged. The cold water in the pipeline from the
Since it is discharged inside, it is inevitable that the bather feels uncomfortable touching this cold hot water, and the discharge time of cold hot water is shorter than in the conventional case, so there was an improvement by that amount, It is not enough to eliminate the unpleasant feeling of the bather, and further improvement is desired.

The present invention has been made in view of the above circumstances, and an object thereof is to further alleviate the discomfort that hot water in a cold conduit comes into contact with the body of a bather at a high flow rate at the start of the operation in the heat retention mode. Another object of the present invention is to provide a heat-retaining device for reheating the bath pot that can be used.

[0013]

In order to achieve the above object, the present invention is constructed as follows. That is, the first aspect of the present invention includes a reheating circulation path connected to the bathtub through a connection conduit, and the reheating circulation path heats a recirculation pump that circulates hot water in the bathtub and a reheating burner. Provided with a reheating heat exchanger as a drive source, a bath temperature sensor for detecting the temperature of hot water introduced from the bathtub to the reheating heat exchanger, and a running water sensor for detecting the flow of hot and cold water in the reheating circulation path. In the heat retention mode, the circulating pump is driven every predetermined time to compare the detected temperature of the bath detected by the bath temperature sensor with the bath set temperature set by the temperature setting unit, and the detected temperature is higher than the bath set temperature. When the temperature falls, the circulating hot water is heated to the bath set temperature by the reheating heat exchanger to keep the heat reheated. The intermittent pump drive that repeatedly drives the circulation pump on and off at short intervals, and the time when hot water in the reheating circulation path and connection pipeline ends from the start of intermittent operation of the circulation pump to the bathtub side. A pump drive switching unit that switches the circulating pump from intermittent drive to continuous drive when a given intermittent duration time has elapsed is provided, and the detected temperature of the bath and the bath set temperature are set after the circulating pump is switched to continuous drive. It is characterized in that a transition is made to a heat retention operation involving additional heating for comparison.

A second aspect of the invention is that the intermittent duration of the intermittent drive of the circulation pump in the first aspect of the invention is one cycle of ON / OFF operation of the circulation pump, and the intermittent drive of the circulation pump is started. From the bath temperature sensor to the stable detection of the bath temperature of the bath water. Has been done.

Further, the third invention is provided with a reheating circulation path connected to the bathtub through a connection conduit, and in the reheating circulation path, a circulation pump for circulating the hot and cold water of the bathtub,
The reheating heat exchanger that uses the reheating burner as a heating drive source, the bath temperature sensor that detects the temperature of the hot water introduced from the bathtub to the reheating heat exchanger, and the flow of hot and cold water in the reheating circulation path A running water sensor is provided, and in the heat retention mode, the circulating pump is driven every predetermined time to compare the detected temperature of the bath detected by the bath temperature sensor with the bath set temperature set by the temperature setting unit. When the temperature drops below the bath set temperature, the circulating hot water is heated to the bath set temperature by the reheating heat exchanger to keep the heat reheated. When the circulating pump is turned on and off repeatedly at short intervals, a pump intermittent drive unit is used, and when the circulating pump is on On of the circulation pump according to the driving unit,
Intermittent burner combustion control unit that intermittently burns the refueling burner on and off in synchronization with the off operation, and circulates when the bath temperature sensor stably detects the hot water temperature of the bath water during the on / off intermittent drive of the circulation pump. A pump drive switching unit that switches intermittent drive to continuous drive of the pump is provided, and after the circulation pump is switched to continuous drive, the temperature detected by the bath is compared with the set temperature of the bath to shift to a warming operation with additional heating. It is configured to do so.

[0016]

In the present invention having the above-described structure, the circulation pump is started at the start of the heat retention mode operation, but in the present invention, the circulation pump is intermittently driven rather than continuously driven. Even if the cold water in the reheating circulation path or the connecting pipe is discharged into the bathtub, the cold water is discharged intermittently, so the flow velocity is considerably low, and the discharged cold water and the bathtub Since the hot water is mixed and stirred before reaching the bather, the bather is exposed to a weak water flow whose temperature has risen due to the stirring, and the discomfort of the low-temperature discharge flow given to the bather is eliminated.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The mechanical structure of the bathtub equipped with the reheating heat retaining device in this embodiment and the system for constructing the bathtub with respect to the bathtub are the same as those in the conventional example shown in FIG. 5, and the same names as those in the conventional example are designated by the same reference numerals. The duplicate description is omitted.

The characteristic feature of this embodiment is that a circuit for controlling a unique reheating heating operation is provided in the control device 22. FIG. 1 shows the main configuration of the circuit of the first embodiment which is peculiar to performing the additional heating heat retaining operation. This additional heating control circuit includes a temperature comparison unit 24, an additional heating control unit 25, a bath temperature monitor unit 26, and a counter 27.
A pump drive switching unit 28 and a pump intermittent drive unit 30.
, Pump continuous drive unit 31, and heat retention mode signal output unit 32
And a heat retention mode operation command section 33 and a timer 34.

The heat retention mode signal output section 32 outputs a heat retention mode signal when the reheating operation in the reheating mode is completed. In response to the heat retention mode signal, the heat retention mode operation command unit 33 causes the counter 27 and the pump drive switching unit 28 to operate.
The operation command in the heat retention mode is added to and. The heat retention mode operation command unit 33 uses the timer 34 for a predetermined time, and outputs the heat retention mode operation command every 30 minutes in this embodiment, from the start of the heat retention mode, that is, the reheating mode. After a lapse of a predetermined period of time and a heat retention mode signal is output, a termination command of the heat retention mode operation is output when a predetermined long time has passed, that is, four hours in this embodiment.

On the other hand, the temperature comparison unit 24 compares the bath set temperature set by the remote controller 23 with the detected temperature detected by the bath temperature sensor 10, and adds the comparison result to the reheating heating control unit 25. The bath temperature monitor unit 26 monitors the temperature detected by the bath temperature sensor 10 and detects the time when the bath temperature sensor 10 stably detects the temperature of the hot water in the bath after the start of the heat retention operation. In this embodiment, the set temperature of the bath is 42 ° C, and the temperature of the hot water in the bathtub in the heat retention mode is assumed to be 36 ° C or higher, and the bath temperature sensor 10 measures the temperature of the cold hot water in the reheating circulation path 16. When the temperature of 36 ° C. or higher is stably detected from the detected state, it is determined that the temperature of the hot water in the bathtub is detected, and the determination signal is added to the counter 27 and the pump drive switching unit 28.

The counter 27 has the warming mode operation command section 33.
When the heat retention mode operation command is applied from the counter, the count value is cleared to zero, and the intermittent driving operation of the circulation pump 8 by the pump intermittent driving unit 30 described later is set as one cycle, and the number of cycles is counted. Add up. And
Each time the pump intermittent drive unit 30 carries out the pump intermittent drive of the circulation pump 8 from the time when the bath temperature detection judgment signal of the bath temperature monitor unit 26 is received, the pump on / off cycle number is subtracted, and the subtraction is performed. As a result, when the count value returns to zero, a return zero signal is added to the pump drive switching unit 28 and the reheating warming control unit 25.

The pump drive switching unit 28 commands the drive of the pump intermittent drive unit 30 when a heat retention mode operation command is applied from the heat retention mode operation command unit 33, and when a return zero signal is received from the counter 27, After confirming that the bath temperature detection determination signal is output from the bath temperature monitor unit 26, the drive command is switched from the pump intermittent drive unit 30 to the pump continuous drive unit 31.

The pump intermittent drive unit 30 makes one cycle of short-time ON drive for 5 seconds and OFF drive for 5 seconds in this embodiment when the drive command is applied from the pump drive switching unit 28. As a result, the intermittent drive of the circulation pump 8 is repeatedly performed, and the intermittent drive of the circulation pump 8 is stopped when the switching drive command is applied from the pump drive switching unit 28. The pump continuous drive unit 31 is a pump drive switching unit 28.
Circulation pump 8 when a switching drive command is applied from
Is continuously turned on. The pump intermittent drive unit 30 adds the cycle number of the intermittent drive of the circulation pump 8 to the counter 27 for each cycle.

The reheating heating control section 25 receives a switching drive command signal from the pump drive switching section 28 to the pump continuous drive section 31 and the return zero signal from the counter 27, and the temperature comparison section 24 compares the temperature. Based on the result, it is confirmed that the temperature detected by the bath temperature sensor 10 is lower than the bath set temperature set by the remote controller 23, and further, the on-burning burner 3 is ignited upon receiving the ON signal from the running water switch 15. When the temperature of the circulating pump 8 is burned, the temperature of the bathtub hot water is reheated and maintained, and when the temperature detected by the bath temperature sensor 10 reaches the bath set temperature based on the temperature comparison result of the temperature comparison unit 24, the continuous pump drive unit 31 operates the circulation pump 8 A stop command is issued to stop the circulation pump 8, and after confirming that an off signal is added from the water flow switch 15, the combustion of the reheating burner 3 is stopped.

The first embodiment is constructed as described above, and the additional heating operation will be described with reference to the flow chart of FIG.

After starting the heat retention mode, it is determined in step 101 whether or not a predetermined time, 30 minutes in this example, has elapsed.
It is assumed that the hot and cold water in the bathtub has reached a temperature at which bathing is possible before 30 minutes have elapsed, and the elapse of time from the step 102 onward is not performed to wait for the passage of time.

When 30 minutes have elapsed from the start of the heat retention mode, a heat retention mode operation command is issued from the heat retention mode operation designating unit 33 in FIG. 1, and based on this, step 102 is executed.
Then, the count value of the counter 27 is cleared to zero. Then, in steps 103 and 104, the intermittent drive of the circulation pump 8 is performed alternately for 5 seconds. Then, the number of intermittent drive cycles of this on / off of the circulation pump 8 is counted by the counter 27. In step 106, it is determined whether 5 minutes have elapsed since the first circulation pump was turned on. This step 10
The operation of 6 is an operation for preventing the on / off intermittent drive of the circulation pump 8 from being endlessly repeated. When 5 minutes have not elapsed since the first circulation pump 8 was turned on, it is determined in step 107 whether the temperature detected by the bath temperature sensor 10 is 36 ° C. or higher. When the temperature detected by the bath temperature sensor 10 is less than 36 ° C, it is determined that the hot water in the bathtub 20 has not reached the installation position of the bath temperature sensor 10 in the reheating circulation path 16 after the intermittent activation of the circulation pump 8. Then wait until it is confirmed that the hot water in the bathtub has arrived.

When the temperature detected by the bath temperature sensor 10 is 36 ° C. or higher, it is determined that the hot and cold water in the bath has been circulated and supplied to the position where the bath temperature sensor 10 is installed, and the intermittent drive of the circulation pump 8 is continuously repeated. . The counter 27 counts and integrates the number of cycles of the intermittent drive of the circulation pump 8 until the hot water in the bathtub is confirmed. After the arrival of the hot water in the bathtub is confirmed in step 107, the number of intermittent cycles of the circulation pump 8 is increased. Subtract and go. Counter 27 in step 111
When the count value of is zero, the cold hot water that has accumulated in the reheating circulation path 16 and the connecting pipelines 17 and 18 when the circulation pump 8 is first started completely enters the bathtub 20 and the reheating cycle is performed. It is determined that the passage 16 and the connecting pipes 17 and 18 are filled with the hot water in the bathtub, and in the next step 112, the circulation pump 8 is switched to the continuous drive.

That is, the bath temperature sensor 10 passes from the bathtub 20 through the connection pipe line 18 and further through the reheating circulation line 16,
Assuming that the bath temperature sensor 10 detects the stable temperature of the bath water from the start of the intermittent drive of the circulation pump 8, assuming that it is located almost at an intermediate position of the loop path that returns to the bathtub 20 through the connection pipe line 17. When it becomes, that is, bath temperature sensor 10
Counter 28 when the temperature of hot water in the bathtub is detected by
It is determined that the bathtub hot and cold water has reached half of the loop path at a time corresponding to the count value of, and after the arrival of the bathtub hot and cold water is detected, the cycle value of the intermittent drive of the circulation pump 8 is subtracted and the count value When it becomes zero, it is judged that the hot and cold water of the bathtub that has entered the position where the bath temperature sensor 10 is installed has returned to the bathtub 20 through the other half of the loop path. It is judged that it was satisfied with.

After the circulation pump 8 is switched to the continuous operation in step 112, the running water switch 15 is operated in step 113.
Confirm that the ON signal is output from the
At 114, the bath temperature sensor 10 detects the bath temperature.
Then, in step 115, the set temperature of the bath and the detected temperature are compared, and when the detected temperature is equal to or lower than the set temperature of the bath, the reheating burner 3 is ignited and burned to heat the circulating hot water passing through the reheating heat exchanger 2 to obtain the bath temperature. When it is confirmed that the temperature detected by the sensor 10 has reached the bath set temperature, the circulation pump 8
To stop. By this operation, the hot water in the bathtub 20 is kept at the bath set temperature. In step 118, it is determined whether or not 4 hours have elapsed since the heat retention mode was entered. Before the lapse of 4 hours, the reheating heating operation after step 101 is performed every 30 minutes. When 4 hours have elapsed from the start of the heat retention mode, it is determined that the time for bathing has passed, and the operation of the heat retention mode is ended.

According to this embodiment, after the operation of the heat retention mode is started, until the cold hot water staying in the reheating circulation path 16 and the loop paths in the connecting pipelines 17 and 18 enters the bathtub 20, Since the circulation pump 8 is driven intermittently, the cold hot water accumulated in the loop path is not discharged into the bathtub 20 at a high speed. Like this, the bathtub
The cold hot water discharged into the bath 20 is discharged intermittently, so the flow velocity is weakened, and even if the cold hot water enters the bathtub 20, it is mixed with the hot water in the surrounding bathtub due to the weak flow and the hot water temperature is close to the temperature in the bathtub. As a result, the hot water with a slow flow velocity, which is warmed by this mixing, will come into contact with the bather. The cold water accumulated in the loop path is discharged into the bathtub with a high flow velocity, and because of the high flow velocity, the cold water directly touches the body of the bather without agitating and mixing with the bath water. The problem of doing can be effectively solved.

FIG. 3 shows a block diagram of the essential structure of the second embodiment of the present invention. In the second embodiment, when the operation in the heat retention mode is started, the circulation pump is intermittently driven similarly to the first embodiment, but the characteristic of this embodiment is that the circulation pump is intermittently driven. It is configured to switch the circulating pump from intermittent drive to continuous drive after the bath temperature sensor detects the temperature of the hot water of the bathtub in a stable manner in synchronization with the reheating burner.
The other structure is the same as that of the first embodiment.
The same components as those in the embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

In the second embodiment shown in FIG. 3, the counter 27 of the first embodiment is omitted and the burner intermittent combustion control section 35 is used.
Is provided. The burner intermittent combustion control unit 35, when starting the operation of the heat retention mode, based on the heat retention mode operation command of the heat retention mode operation command unit 33, the pump drive switching unit 28 issues a drive command to the pump intermittent drive unit 30, and the circulation pump. 8
Is driven intermittently to control the combustion of the reheating burner 3 for each section of the flowing water detection signal detected by the flowing water switch 15, that is, the ON signal.

That is, in synchronization with the intermittent drive of the circulation pump 8, the reheating burner 3 is burned when the circulation pump 8 is on, and the reheating burner 3 is stopped when the circulation pump 8 is off. The burner 3 is subjected to intermittent combustion control. Then, the burner intermittent combustion control unit 35,
The intermittent combustion control of the reheating burner 3 is stopped in response to a detection determination signal that detects that the bath water has reached the installation position of the bath temperature sensor 10 from the bath temperature monitor unit 26. On the other hand, upon receiving the detection determination signal of the bath temperature monitor unit 26, the reheating thermal insulation control unit 25 enters its control operation state.
That is, when the bath temperature monitor unit 26 detects that the bath water has reached the installation position of the bath temperature sensor 10 and a detection determination signal is output, the control of the reheating burner 3 is controlled by the burner intermittent combustion control unit 35. From reheating control section 25
It switches to.

On the other hand, the pump drive switching unit 28
When receiving the detection judgment signal of the bath temperature monitor unit 26, the drive unit of the circulation pump 8 is switched from the pump intermittent drive unit 30 to the pump continuous drive unit 31. The circulation pump 8 is continuously driven by the pump continuous drive unit 31 by switching the pump drive unit, and in this state, the temperature comparison unit 24 is remote controlled.
The bath set temperature set in 23 is compared with the detected temperature detected by the bath temperature sensor 10, and the comparison result is added to the additional heating control unit 25. When the detected temperature is lower than the bath set temperature, the additional heating control unit 25 burns the additional heating burner 3 to perform additional heating, and when the temperature detected by the bath temperature sensor 10 reaches the preset bath temperature 5, the pump continues to operate. The drive unit 31 is instructed to stop the circulation pump 8 and the combustion of the reburning burner 3 is stopped.

Next, the operation of the reheating heating mode of the second embodiment will be described with reference to the flowchart of FIG. When the heat retention mode is entered, it is determined in step 201 whether or not 30 minutes have elapsed since the start of the heat retention mode. When 30 minutes have passed, the circulation pump 8 is turned on in step 202, and it is confirmed that the ON signal is output from the water flow switch 15, and the reheating burner 3 is burned, and the circulation pump is turned on. When a predetermined short time, in this example, 5 seconds, the circulation pump 8 is stopped, and at the same time, the combustion of the reburning burner 3 is stopped. In synchronism with the intermittent drive of the circulation pump 8 which is repeatedly performed every 5 seconds, the combustion and stop of combustion of the reburning burner 3 are also intermittently repeated at intervals of 5 seconds.

In step 207, the bath temperature monitor unit 26 determines whether or not the hot and cold water in the bathtub has reached the installation position of the bath temperature sensor 10. When the bath temperature sensor 10 detects a hot water temperature of 36 ℃ or higher, the bath water is
It is judged that the 10 installation positions have been reached, and the next step
At 208, the circulation pump 8 is switched to continuous operation. And
In step 209, it is confirmed that the ON signal is output from the running water switch 15, and the bath temperature sensor 10 detects the hot water temperature.

In step 211, the bath temperature set by the remote controller 23 is compared with the temperature detected by the bath temperature sensor 10. When the detected temperature is lower than the bath temperature, the reheating burner 3 is burned to change the bath temperature to the bath temperature. After raising the temperature to the set temperature and keeping it warm, the circulation pump 8 is turned on in step 213.
Stop, and determine whether 4 hours have passed since the start of the heat retention mode. If 4 hours have not elapsed, repeat the heating operation from step 201 onward and repeat the operation in the heating energy control mode after 4 hours have elapsed. To finish.

In the second embodiment, since the circulation pump 8 is driven intermittently when the operation of the reheating heat retention mode is started, the reheating heat exchanger 2 is driven from the reheating heat exchanger 2 as in the first embodiment. The cold hot water in the pipe leading to the bathtub 20 is intermittently (intermittently) discharged into the bathtub 20, and the flow velocity of the cold hot water discharged to the bathtub 20 is weakened as in the first embodiment. Since the discharge flow that has been heated and mixed with the hot water in the bathtub will gently touch the body of the bather,
It is possible to effectively eliminate the discomfort caused by the hot water coming into contact with the bather.

Further, the cold water accumulated in the conduit between the entrance side of the reheating heat exchanger and the bathtub 20 at the start of the operation of the reheating heating mode is increased in temperature by the intermittent combustion of the reheating burner. From the outlet of the reheating heat exchanger 2 to the bathtub 20
The hot water warmed by this intermittent combustion is discharged into the bathtub 20 during the next continuous drive of the circulation pump 8 because the discharge flow velocity increases, and the discharge flow increases the body flow of the bather. The bather does not feel uncomfortable when touched hard.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, the running water switch 15 is used as the running water sensor in the above embodiment, but this running water sensor may be any one that can detect the flow of hot water in the reheating circulation path 16, for example, a flow sensor (flow rate sensor) or the like. Other sensors may be used.

Further, in the first embodiment, at the start of the heating operation for reheating, the cold hot water staying in the route returning from the bathtub 20 to the bathtub 20 via the reheating heat exchanger 2 is discharged to the bathtub 20 side. The time to finish is given as a time that is twice the count value of the intermittent drive cycle of the circulation pump 8 counted by the counter 27 while the bath water reaches the position where the bath temperature sensor 10 is installed. Differently, for example, when the circulating pump 8 is intermittently driven by calculation by taking into consideration the conditions such as the capacity of the circulation pump 8 and the diameter of the pipe line, or by performing experiments in advance, the hot water in the bathtub loops. The time required to return to the bathtub through the route may be measured, and the time obtained by this calculation or measurement may be given as the time when the hot and cold water in the loop route ends.

Further, in each of the above embodiments, the intermittent on / off drive of the circulation pump 8 was performed at intervals of 5 seconds, but this time depends on the magnitude of the flow velocity of the cold hot water in the loop path discharged into the bath 20 and the like. It goes without saying that it can be changed accordingly.

Furthermore, in each of the above-mentioned embodiments, after the operation of the reheating warming mode is started, the bath water reaches the installation position of the bath temperature sensor 10 when the bath temperature sensor 10 detects a temperature of 36 ° C. or higher. However, the temperature that serves as the criterion is not necessarily limited to 36 ° C,
For example, it can be set to an appropriate value such as 35 ° C or 37 ° C.

Further, in the second embodiment, when the circulation pump 8 is intermittently driven, when the pump is turned on, the reheating burner 3 is burned in accordance with the pump on time (the same time as the pump on time). The burning time of the reburning burner does not necessarily have to match the on time of the circulation pump. As an example, the combustion time of the reburning burner 3 may be varied according to the difference between the temperature detected by the bath temperature sensor 10 and the bath set temperature. In this case, for example, the burner combustion time may be continuously shortened as the detected temperature approaches the bath set temperature (as the temperature difference becomes smaller), or may be stepwise shortened. .

[0046]

According to the present invention, when the additional heating operation is started,
Since the circulation pump is intermittently turned on / off to circulate hot water in the bathtub through the reheating circulation path, the bathtub returns to the bathtub via the reheating heat exchanger before the start of the heating operation. Even if the cold hot water accumulated in the loop path is discharged into the bathtub, the discharge flow is delayed due to the intermittent operation of the circulation pump, and the flow velocity is intermittently interrupted. The stirring and mixing of the hot water is accelerated, and the hot water that is heated by stirring and mixing comes into contact with the body of the bather at a slow flow rate. It is possible to carry out the heat-retaining operation by reheating without making the bather feel uncomfortable.

Further, in the structure in which the reheating burner is intermittently burned in synchronization with the intermittent drive of the circulation pump at the start of the reheating heating mode, the reheating heat exchanger is provided between the outlet side and the bathtub. After the cold water that had accumulated was intermittently discharged, the cold water that had accumulated between the entrance side of the next reheating heat exchanger and the bathtub would be warmed by intermittent combustion, and this warmed water would be used next in the bathtub. Since it enters, the inflow time of cold hot water entering the bathtub can be shortened, and the discomfort to the bather at the start of the operation in the heat retention mode can be more effectively eliminated.

[Brief description of drawings]

FIG. 1 is a first heat-retaining device for reheating a bath kettle according to the present invention.
3 is a block diagram showing the configuration of the main part of the embodiment of FIG.

FIG. 2 is a flow chart showing the operation of the embodiment.

FIG. 3 is a block diagram showing a main configuration of a second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is an explanatory diagram of an installation system of a bathtub equipped with a reheating heat insulation device.

[Explanation of symbols]

 8 Circulation pump 10 Bath temperature sensor 15 Flow switch 16 Reheating circuit 28 Pump drive switching unit 30 Pump intermittent drive unit 31 Pump continuous drive unit 35 Burner intermittent combustion control unit

Claims (3)

[Claims] 1. A reheating circulation path connected to a bathtub through a connection conduit, wherein the reheating circulation path circulates and drives hot water of the bathtub and a reheating burner as a heating drive source. There is a reheating heat exchanger, a bath temperature sensor that detects the temperature of the hot water introduced from the bathtub to the reheating heat exchanger, and a running water sensor that detects the flow of hot water in the reheating circulation path. When in the mode, the circulating pump is driven every predetermined time and the detected temperature of the bath detected by the bath temperature sensor is compared with the bath set temperature set by the temperature setting unit, and when the detected temperature falls below the bath set temperature. In the reheating warmer of the bath kettle that heats the circulating hot water with a heat exchanger to reheat it until the bath temperature reaches the set temperature, the circulating pouring is performed when the start timing of the circulation pump is reached in the warming mode. The pump intermittent drive section that repeatedly turns the pump on and off at short intervals, and the time for hot water in the reheating circulation path and the connection pipeline to end on the bathtub side from the start of intermittent operation of the circulation pump are given in advance. A pump drive switching unit that switches the circulation pump from intermittent drive to continuous drive when the intermittent duration time has elapsed is provided, and the detected temperature of the bath and the bath set temperature are compared after the circulation pump is switched to continuous drive. Reheating device for bath kettle that is designed to shift to warming operation with reheating. 2. The intermittent duration of the intermittent drive of the circulation pump is one cycle of one on / off operation of the circulation pump, and the bath temperature sensor stabilizes the hot water temperature of the bath water from the start of the intermittent drive of the circulation pump. The reheating heat retaining device for a bath tub according to claim 1, wherein a cycle number twice as many as the number of cycles of the ON / OFF operation repeated until the detection is performed is given as a time until completion. 3. A reheating circulation path connected to the bathtub via a connection conduit, wherein the reheating circulation path is a circulation pump for circulating the hot and cold water of the bathtub and a reheating burner as a heating drive source. There is a reheating heat exchanger, a bath temperature sensor that detects the temperature of the hot water introduced from the bathtub to the reheating heat exchanger, and a running water sensor that detects the flow of hot water in the reheating circulation path. When in the mode, the circulating pump is driven every predetermined time and the detected temperature of the bath detected by the bath temperature sensor is compared with the bath set temperature set by the temperature setting unit, and when the detected temperature falls below the bath set temperature. In the reheating warmer of the bath kettle that heats the circulating hot water with a heat exchanger to reheat it until the bath temperature reaches the set temperature, the circulating pouring is performed when the start timing of the circulation pump is reached in the warming mode. Pump intermittently drives the pump repeatedly on and off at short intervals, and follows the circulating pump on / off operation by the pump intermittent drive based on the running water detection signal of the running water sensor when the circulating pump is on. Intermittent burner combustion control unit that intermittently burns the burner on and off, and intermittent drive of the circulation pump when the bath temperature sensor stably detects the hot water temperature of the bath water during the on / off intermittent drive of the circulation pump. A pump drive switching unit for switching to the continuous operation of the circulation pump, and after the circulating pump is switched to the continuous drive, the temperature of the bath is compared with the set temperature of the bath to shift to a heat-retaining operation with additional heating. Additional heat insulation device.