JP3713748B2 - 1 can 2 circuit bath - Google Patents

Description

[0001]
[Industrial application fields]
The present invention provides one can 2 that heats and heats heat by using two circuits of a reheating circulation path that reheats and heats bathtub water and a hot water hot water supply path that heats and supplies hot water from a water supply with a single burner. The present invention relates to a 1-can 2-circuit-type bath apparatus equipped with a circuit-type heat exchange can body.
[0002]
[Prior art]
Conventionally, in a 1-can 2-circuit bath apparatus, the heat exchange can of the heat exchange pipe on the hot water hot water supply side penetrating through the heat exchange can body in order to prevent boiling of the hot water hot water supply path side circuit at the time of bathing alone operation A temperature sensor for preventing boiling is provided in the vent portion protruding from the body. When the temperature sensor for preventing boiling detects a high temperature above a certain temperature, combustion is stopped during that time, and combustion is resumed when the temperature decreases. And about the said temperature sensor for boiling prevention, it was judged as a failure by the disconnection state of this sensor, and a short circuit state.
[0003]
[Problems to be solved by the invention]
However, in the above conventional one-can two-circuit bath apparatus, regarding the failure of the temperature sensor for boiling prevention, the sensor detects that it is broken and short-circuited, but it is judged as a failure. If the temperature sensor for prevention is malfunctioning while showing a halfway temperature, for example, the temperature sensor for boiling prevention is composed of a thermistor, and the thermistor malfunctions with a halfway temperature resistance value. In such a case, since this was not detected as a failure, there was a case where the hot water hot water supply channel side continued to boil in the heat exchange pipe. If the boiling state continues, the durability of the heat exchange pipe and its surrounding members will deteriorate.
[0004]
Accordingly, the present invention solves the above-described problems of the conventional one-can two-circuit bath apparatus, and the temperature sensor for boiling prevention on the hot water supply channel side is not in a disconnected state or a short-circuited state, and is halfway when the bath is chasing alone. An object of the present invention is to provide a one-can two-circuit bath apparatus that can determine that a failure has occurred even while the temperature is indicated.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a 1 can 2 circuit bath apparatus according to the present invention is a 1 can 2 in which heat exchange pipes of a bath recirculation circuit and a hot water hot water supply path are combined with one burner for heat exchange heating. In addition to a circuit-type heat exchange can body, a temperature sensor for boiling prevention is provided in a part of the heat exchange pipe on the hot water supply channel side, and the temperature sensor for boiling prevention detects a high temperature above a certain temperature when the bath is chasing alone. Then, the combustion is temporarily stopped only during that time, and the combustion is resumed when the temperature is lowered to prevent boiling in the heat exchange pipe on the hot water hot water supply channel side, and the temperature sensor for boiling prevention is disconnected and short-circuited. a can of 2-circuit bathtub apparatus adapted to determine a failure of this case state, when the bath reheating islanding, the boiling prevention temperature at the initial stage of the islanding reheating the bath The detected temperature detected by the sensor is memorized, and the initial detected temperature is compared with the detected temperature detected by the boiling temperature sensor thereafter, so that the temperature change during that time is within a certain range. A controller is provided for judging that the temperature sensor for boiling prevention is out of order.
[0006]
[Action]
According to the above feature of the present invention, the temperature detected by the boiling prevention temperature sensor on the hot water supply channel side is monitored by the controller during the bath reheating operation, and when the boiling prevention temperature sensor detects a high temperature above a certain temperature, Combustion is temporarily stopped only, and if the temperature drops due to this combustion stop, recombustion is performed. In this way, boiling on the hot water hot water supply channel side is prevented. As described above, during bath-only operation, combustion and combustion stop (combustion on / off) are normally repeated, so that the temperature detected by the boiling prevention temperature sensor also repeats vertical changes. During bath-only operation, the detected temperature detected by the boiling water temperature sensor on the hot water hot water supply side is memorized at the beginning of the operation, and the detected temperature in the initial operation and then the boiling temperature sensor detected. By comparing with the detected temperature, if the temperature change during that period is slight within a certain range, it can be determined that the temperature sensor for boiling prevention is faulty. When there is no temperature difference between the temperature detected by the temperature sensor for boiling prevention on the hot water supply channel side at the beginning and the temperature detected after that , the controller actually has some tolerance. If there is only a change within a certain range including, the boiling prevention temperature sensor is determined to be faulty.
[0007]
【Example】
The present invention will be described below based on examples.
FIG. 1 is a simplified configuration diagram showing an embodiment of a one-can two-circuit type bath apparatus according to the present invention, and FIG. 2 is a diagram showing a temperature change on the hot water hot water supply path side during a reheating independent operation.
[0008]
In FIG. 1, a hot water supply heat exchange pipe 21 for a hot water hot water supply path 20 and a bath reheating heat exchange pipe 31 for a bath recirculation circuit 30 are arranged in a single can / two-circuit heat exchange can body 10. Yes. Each heat exchange pipe 21, 31 is provided with a heat exchange fin. The heat exchange can body 10 is provided with a single burner 11 for heating the heat exchange pipes 21 and 31, whereby two circuits, that is, a hot water hot water supply path 20 and a bath are provided by the single burner 11. A one-can two-circuit type heat exchange can body 10 that can heat two systems of water in the recirculation circuit 30 independently or simultaneously is established.
A forward pipe 32 is connected from the bathtub 40 to the heat exchange can body 10, and a return pipe 33 is connected from the heat exchange can body 10 to the bathtub 40, and the bath-heating heat exchange pipe 31, the forward pipe 32, and the return pipe are connected. 33 and the bath chasing circuit 30 are configured. A circulation pump 50 is provided in the outgoing pipe 32 of the bath recirculation circuit 30.
[0009]
In this embodiment, as a part of the hot water supply heat exchange pipe 21 on the hot water hot water supply path 20 side, a boiling prevention temperature sensor 60 is provided at the vent portion protruding from the heat exchange can body 10 of the hot water supply heat exchange pipe 21. The temperature detected by the boiling prevention temperature sensor 60 is monitored by the controller 70.
[0010]
Next, the control configuration when the bath 70 is driven independently by the controller 70 will be described.
Now, when the bath reheating operation is in the single operation state, the circulation pump 50 is driven by the controller 70, and the water flow switch (not shown) detects the water flow in the recirculation circulation passage 30 and turns it on, so that the burner 11 starts burning. Is done. As a result, the water in the bathtub 40 circulates in the recirculation circuit 30 and is heat-exchanged and heated in the heat-exchange pipe 31 for reheating the bath.
During the bath reheating independent operation, the controller 70 monitors the temperature information input from the boiling prevention temperature sensor 60 provided in a part of the hot water supply heat exchange pipe 21, and the boiling prevention temperature sensor 60 is constant. When a high temperature equal to or higher than the temperature is detected, combustion of the burner 11 is stopped.
The constant temperature is a temperature determined in advance by experiment as a temperature at which boiling will occur in the hot water supply heat exchange pipe 21 when combustion is not stopped even when the temperature exceeds that temperature. In FIG. 2, it is set to 80 ° C.
By stopping the combustion of the burner 11, boiling of the hot water hot water supply channel 20 side during non-operation is prevented.
When the operation of the burner 11 is temporarily stopped, the temperature detected by the temperature sensor 60 for boiling prevention will eventually decrease. When the detected temperature decreases to a certain temperature, the controller 70 commands the reburning of the burner 11. To do. As a result, combustion is started and bathing is performed. The constant temperature at which the combustion of the burner 11 is restarted is determined in advance as a temperature slightly lower than the constant temperature at which the combustion is stopped. In this embodiment, the combustion resumption temperature is 75 ° C. with respect to 80 ° C. Since the combustion stop temperature and the combustion restart temperature vary depending on the mounting position of the boiling prevention temperature sensor 60 and other conditions, appropriate temperatures are determined in advance by experiments.
As described above, during the bath-only operation, the combustion of the burner 11 is turned on and off to prevent boiling on the hot water hot water supply channel 20 side. The temperature indicated by the boiling prevention temperature sensor 60 also repeats vertical fluctuations in a sawtooth shape. This state is shown in FIG. That is, when the constant temperature at which the combustion of the burner 11 is to be stopped is 80 ° C. and the constant temperature at which the combustion of the burner 11 is to be resumed is 75 ° C., the burner 11 is turned on and off, in which case the solid line in FIG. As shown in FIG. 2, the temperature changes in the temperature sensor 60 for preventing boiling and the temperature change in the hot water supply heat exchange pipe 21 as shown by the one-dot chain line in FIG.
[0011]
On the other hand, the controller 70 constantly monitors whether or not the boiling prevention temperature sensor 60 is faulty. That is, when the boiling prevention temperature sensor 60 is in a disconnected state or in a short-circuited state, the controller 70 indicates that the input information from the boiling prevention temperature sensor 60 is a very abnormal value corresponding to the disconnected state or the short-circuited state. Therefore, in this case, it is determined that the temperature sensor 60 for preventing boiling has failed. In this case, the controller 70 can stop the combustion.
On the other hand, the controller 70 determines that the temperature sensor 60 for boiling prevention is a failure even when the temperature detected by the temperature sensor 60 for boiling prevention only changes within a certain range during the bath-only operation. That is, the controller 70 stores the temperature detected by the boiling prevention temperature sensor 60 at the initial stage when the bath reheating independent operation is started, and then the detected temperature input from the boiling prevention temperature sensor 60 is less than a certain range. If only the above temperature change is observed, it is determined that the boiling prevention temperature sensor 60 has failed. Also in this case, the controller 70 can stop the combustion.
The temperature change below the certain range is a case where no temperature change is observed, and a case where only a temperature change with a remarkably small width appears with respect to the degree of the temperature-like temperature change normally observed in a normal case. . Although this range can be determined in advance by experiment, it can be set to a range of less than about 5 ° C., for example. A two-dot chain line in FIG. 2 shows a case where the temperature sensor 60 for preventing boiling has failed while showing a halfway temperature.
[0012]
【The invention's effect】
The present invention has the above-described configuration, and according to the one-can two-circuit bath apparatus according to claim 1, the temperature sensor for boiling prevention is provided at the beginning of the start of the bath reheating operation when the bath reheating operation is performed. By storing the detected temperature detected, and comparing the initial detected temperature with the detected temperature detected by the boiling prevention temperature sensor thereafter, even if the temperature change during that time is within a certain range, A controller is provided to determine that the temperature sensor for boiling prevention is faulty.
During the bath-only operation, the temperature sensor for boiling prevention on the hot water supply channel side is not only broken or short-circuited, but also when it is broken with a halfway temperature, Can be determined. Therefore, it is possible to reliably prevent the inconvenience that the hot water hot water supply channel side keeps boiling due to the failure of the temperature sensor for boiling prevention during the bath-only operation, and the durability of the heat exchange pipe on the hot water hot water supply channel side and its surrounding members It is possible to reliably prevent the deterioration.
[Brief description of the drawings]
FIG. 1 is a simplified configuration diagram showing an embodiment of a one-can two-circuit bath apparatus according to the present invention.
FIG. 2 is a diagram showing a temperature change on the hot water hot water supply channel side during a chase-only operation.
[Explanation of symbols]
10 1 can 2 heat exchange can body
11 Burner
20 Hot water hot water supply path
21 Heat exchange pipe for hot water supply
30 Bathing circuit
31 Heat exchange pipe for bathing
32 Outward pipe
33 Return pipe
40 bathtub
50 Circulation pump
60 Temperature sensor for boiling prevention
70 controller

Claims (1)

The heat exchange pipe of the bath recirculation path and the hot water hot water supply path are combined with a single burner to provide a single can two circuit heat exchange can body, and one of the heat exchange pipes on the hot water hot water supply side. The temperature sensor for boiling prevention is provided in the part, and when the bath chasing alone operation, when the temperature sensor for boiling prevention detects a high temperature above a certain temperature, the combustion is paused only during that time, and the combustion is resumed when the temperature falls. In addition to preventing boiling in the heat exchange pipe on the side of the hot water supply channel, a one-can two-circuit bath tank in which when the temperature sensor for boiling prevention is disconnected or short-circuited, it is determined as a failure. an apparatus, at a bath reheating islanding, stores the detected temperature of the boiling prevention temperature sensor detects the initial stage of the islanding reheating the bath, the initial detected temperature and its Wherein the boiling prevention temperature sensor compares the detection temperature detected, the temperature changes in between in each case been made within a certain range, in which a controller determines a failure of the temperature sensor boiling prevented in A 1-can 2-circuit bath apparatus.

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