JPH0429331Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a safety device for a bathtub with a hot water supply function that is equipped with a heat exchange can for bath reheating and a heat exchange can for hot water supply. This invention relates to a safety device in case combustion abnormality occurs due to exhaust gas blockage in a heat exchanger body.

<Prior art and its problems> Conventionally, for example, in a bathtub that uses oil as fuel,
If the fuel exhaust gas generated in the heat exchanger body becomes blocked for some reason, a pressure sensor and its judgment circuit are used as a means to detect the dangerous situation caused by the exhaust blockage and perform safe operation. Ta.

However, when a pressure sensor and its judgment circuit are used, it is not always easy to detect abnormal pressure, the structure is complicated, and the cost is relatively high.

In addition, if exhaust gas leaks from other connections of the heat exchange can when the exhaust is blocked, for example, if exhaust gas leaks from the burner connection to the heat exchange can,
In such a case, there was a risk that the pressure sensor would not be able to detect the dangerous situation properly.

<Purpose> Therefore, the present invention eliminates the drawbacks of the above-mentioned conventional technology,
The purpose of the present invention is to provide a safety device for a bathtub with a hot water supply function, which can simply and reliably detect a dangerous state due to the exhaust gas blockage and perform safe operation by means that do not use a pressure sensor.

<Means for solving the problem> The present invention has a heat exchange can for hot water supply in addition to a heat exchange can for bath reheating, and each can receives fuel blown from a burner. A safety device for a bathtub with a hot water supply function that burns the gas internally and uses the generated high-temperature exhaust gas for heat exchange before discharging it to the outside. The present invention is characterized in that another temperature fuse is disposed near the outer intermediate point of each burner connection port of both heat exchange cans, and the three temperature fuses are connected in series.

<Operation> When the pressure inside the heat exchange can increases due to blockage of the exhaust of the heat exchange can, the flame blown into the heat exchange can from the burner causes a backfire, and the burner itself becomes high temperature. The temperature fuse placed inside the burner is then blown, activating the safety circuit. Furthermore, by arranging another temperature fuse near the midpoint between the two burner connection ports, if high-temperature exhaust gas leaks from the burner connection port, the other temperature fuse will be heated and cut, ensuring safe operation. . Since each temperature fuse is connected in series, safe operation can be performed even if any of the temperature fuses is blown.

<Example> FIG. 1 is a block diagram of an apparatus for implementing the present invention.

The bathtub with hot water supply function is equipped with a heat exchange can body 1 for reheating the bath and a heat exchange can body 2 for hot water supply. Burners 3 and 4 are connected to each heat exchanger body 1 and 2, respectively. Fuel such as oil is blown into the heat exchange cans 1 and 2 from the burners 3 and 4, and combustion occurs. The high-temperature exhaust gas generated in the heat exchange cans 1 and 2 undergoes heat exchange and is then discharged to the outside through the exhaust pipe 5. 6 is a hot water supply circuit where heat is exchanged.

Burner connection ports 1a, 2 of the heat exchange cans 1, 2
Blow-off nozzles 3a and 4a of burners 3 and 4 are fitted into a, and the fitting portions are sealed for the time being. and the blowout nozzle 3 of the burner 3
A first temperature fuse 7 is arranged at the back of the burner 4, and a second temperature fuse 8 is arranged at the back of the blow-off nozzle 4a of the burner 4. Furthermore, the burner connection ports 1 of both heat exchange cans 1 and 2 are arranged close to each other.
Another temperature fuse 9 is placed near the midpoint between a and 2a.

The temperature fuses 7, 8, 9 are connected in series, and a safety monitoring circuit (safety circuit) 1 in the control unit 10
Connected to 1. Now, the temperature fuse 7,
When either one of the fuses 8 and 9 is disconnected, current will no longer flow through the circuit constructed between the safety monitoring circuit 11 and the temperature fuses 7, 8, and 9, so that the safety monitoring circuit 11 will sense a dangerous condition. Outputs safe operation commands. Due to the safety operation, combustion of the burners 3 and 4 is stopped.

If there is an exhaust blockage in the heat exchanger body 1 for reheating, the burner 3 will be closed by a backup fire or the like.
is heated, and the temperature fuse 7 in the blow-off nozzle 3a is cut off. Similarly, if there is an exhaust blockage in the heat exchanger body 2 for hot water supply, the blowout nozzle 4a will also be blocked.
A temperature fuse 8 disposed inside is blown by receiving radiant heat. On the other hand, the other temperature fuse 9 is heated and breaks when high-temperature exhaust gas leaks from the burner connection ports 1a or 2a for some reason, such as when there is a problem with the sealing of the burner connection ports 1a or 2a.

<Effects> The present invention has the above-mentioned configuration, and a temperature fuse that works in the safety circuit is placed in each burner, one connected to the heat exchange can for reheating and the other burner connected to the heat exchange can for hot water supply. At the same time, another temperature fuse is placed near the outer midpoint of the two burner connection ports, and these temperature fuses are connected in series, so there is no possibility that exhaust air blockage will occur in either heat exchanger body. Safe operation is performed even if the The safety operation is also performed when exhaust gas is leaking from the burner connection port. In other words, if any temperature fuse is blown, a safe operation is performed, so safety is ensured. In addition, by connecting temperature fuses in series, it is possible to detect abnormalities in two cans with one safety monitoring circuit and perform safe operation.
The configuration is simple and low cost. Since a temperature fuse is used, if it melts and breaks, it can be reliably detected, and the structure is simpler than the conventional one using a pressure sensor, and reliable operation is ensured.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus for implementing the present invention. 1... Heat exchange can for bath reheating, 2... Heat exchange can for hot water supply, 1a, 2a... Burner connection port,
3, 4... Burner, 3a, 4a... Burner blow-off nozzle, 5... Exhaust pipe, 7, 8, 9... Temperature fuse, 10... Control unit, 11... Safety monitoring circuit

Claims (1)

[Scope of utility model registration request] In addition to the heat exchange cans for reheating the bath, there are heat exchange cans for hot water supply, and each can internally burns the fuel injected from the burner, and uses the generated high-temperature exhaust gas for heat exchange. A safety device for a bathtub with a hot water supply function that discharges hot water to the outside after
A high-temperature fuse working in a safety circuit is arranged in each of the burners, and another temperature fuse is arranged near the outer intermediate point of each burner connection port of both heat exchange cans, and these three temperature fuses are connected in series. A safety device for a bathtub with a hot water supply function, characterized in that it is connected to a hot water heater.