JPH0116977Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> In addition to primary heating such as hot air, this invention uses exhaust heat to create hot water and circulates the hot water to a radiator located at a remote location. This relates to a safety device for heaters that provide secondary heating.

<Prior art> As shown in Utility Model Application No. 58-164218, shown in Figures 1 and 2, filed by the applicant of the present application, in the past, people forgot to operate the circulation pump, or the circulation pump was turned off during combustion. If the hot water heat exchanger malfunctions and water or hot water does not circulate, the hot water heat exchanger will run dry, so in order to prevent this, a heat sensitive element is installed to detect overheating of the hot water heat exchanger and a buzzer is installed. We provided a device that can be linked to alarm means such as lights and lamps.

<Problems to be solved by the invention> However, in this conventional method, if the circulation pump is operated immediately after the combustion is stopped in a hurry due to the alarm from the alarm means, residual heat will be generated. Therefore, water or low-temperature water is suddenly circulated through the hot water heat exchanger that is still being overheated, and as a result, the water or low-temperature water boils rapidly, making a loud boiling sound and causing the hot water heat exchanger to vibrate. In severe cases, the hot water heat exchanger could be damaged or the connections could come loose, creating a dangerous situation.

<Means for solving the problem> A hot air heating unit is constituted by a hot air heat exchanger that communicates with a combustion chamber equipped with a combustion burner, and a hot air fan that blows air around the outer circumference of the hot air heat exchanger. On the other hand, a hot water heat exchanger is installed inside the combustion chamber, and the hot water heat exchanger constitutes a hot water heating unit connected to a radiator via a circulation pump that circulates hot water, and the hot water heating unit and the hot air are connected to each other. In a heater configured with a heating unit, the hot water heat exchanger is provided with a heat sensitive element for detecting temperature, and the heat sensitive element normally closes the pump circuit including the circulation pump and detects the temperature of the hot water heat exchanger. This relates to a safety device for a heater, which is connected in series with each circuit so as to switch to an alarm circuit having an alarm means when the temperature exceeds a set temperature, and further connected in series with a changeover switch that is at least manually opened/closed to the pump circuit. .

<Function> By carrying out the well-known combustion operation and hot water circulation operation, the hot air heat exchanger 4 performs primary heating of the hot air by the hot air fan 6, and at the same time, the hot water heat exchanger 8 operates the circulation pump 9. Secondary heating of hot water can be effectively performed by the radiator 11 via the radiator 11.

Switch 18 is turned OFF contact b during combustion operation
If the side remains closed, the pump circuit 16
The hot water heat exchanger 8 is in the OFF state, so the hot water heat exchanger 8 is in the dry heating state, and the heat sensitive element 12 detects this, switches from the pump circuit 16 and closes the alarm circuit 17.
Alarm means 19 issues an alarm.

At this time, by extinguishing the combustion burner 3 and switching the changeover switch 18 to the ON contact a side, the hot water heat exchanger 8 is allowed to cool naturally without rapidly flowing low-temperature water, and the heat-sensitive element 12 is cooled naturally. Detecting this, the alarm circuit 17 is opened again and the pump circuit 1
6 is closed and the circulation pump 9 is operated.

<Embodiment> 1 is a hot air heating unit that performs hot air heating, and its configuration includes a combustion chamber 2 in an exterior frame, a combustion burner 3 is installed in the lower part of the combustion chamber 2, and a hot air heater is installed in the upper part. The hot air heat exchanger 4 is connected to an exhaust device 5, and a hot air fan 6 is provided at the rear of the hot air heat exchanger 4 to blow air forward.

Reference numeral 7 denotes a hot water heating unit, and its configuration is such that a hot water heat exchanger 8 is installed in the combustion chamber 2 of the hot air heating unit 1, and the hot water heat exchanger 8 includes a circulation pump 9 for circulating hot water and a hot water tank. It communicates with a heat radiator 11 such as a floor heating system via 10.

Reference numeral 12 denotes a heat-sensitive element such as a thermostat attached to the hot water heat exchanger 8, which is attached to be activated when the hot water temperature reaches a set temperature of 70 to 80 degrees Celsius or higher.

Next, to explain the electric circuit, basically it is connected to the main circuit 14 to which the power switch 13 is connected, and a pump circuit 16 in which the circulation pump 9 and the lamp 15 are connected in parallel.One end is connected to the pump circuit 16 and the other end is connected to the main circuit 14. It is connected to the power source side from the power switch 13 and consists of an alarm circuit 17.

At one end of the pump circuit 16 and alarm circuit 17, there is a heat-sensitive element 12 that normally closes the pump circuit 16 side, opens the pump circuit 16 when the hot water heat exchanger 8 reaches a set temperature, and closes the alarm circuit 17 side. Connected in series, and the other end of the pump circuit 16 has an ON contact a.
A changeover switch 18 is connected to manually switch the OFF contact b for safety and the trial run contact c connected to the other end of the alarm circuit 17.

Further, the alarm circuit 17 is connected in series with an alarm means 19 such as a buzzer or a lamp, a timer 20 that opens the circuit after a certain period of time, and a stop switch 21.

Further, 22 is a combustion control circuit, 23 is a power source, and 24 is a connection point.

The operation of the apparatus constructed as described above will now be described. At the same time as the well-known combustion operation is performed, the selector switch 18 is closed to the ON contact a side.

As a result, the heat exchanger 8 for hot water is heated by the heat of the combustion burner 3 in exactly the same way as in the conventional case, and the hot water is circulated to the radiator 11 by the circulation pump 9.
Secondary heating of hot water is performed by the hot air heating system, and primary heating of hot air is performed by the hot air heat exchanger 4 and hot air fan 6, of course.

By the way, when operating the combustion operation, the selector switch 18 is
If the OFF contact b side remains closed,
Since the water in the hot water heat exchanger 8 is not circulated, the temperature will exceed the set temperature.

At this time, the heat sensitive element 12 opens the pump circuit 16 and closes the alarm circuit 17.

Therefore, the alarm means 19 issues an alarm, but even if the changeover switch 18 is hurriedly switched to the ON contact a side, the heat-sensitive element 12 is not connected to the pump circuit 16.
is open and the circulation pump 9 is not operated.

Therefore, the combustion burner 3 is extinguished by an alarm, and the hot water heat exchanger 8 does not generate loud boiling noise or vibrate due to natural cooling that does not allow low-temperature water to suddenly flow into the overheated hot water heat exchanger 8. Of course, the hot water heat exchanger 8 will not be damaged or its connections will be disconnected.

In response to the alarm from the alarm means 19, the combustion burner 3
Once extinguished and the hot water heat exchanger 8 is also cooled down, the heat sensitive element 12 closes the pump circuit 16 again,
Therefore, after confirming that the changeover switch 18 has been switched to the ON contact a side, the circulation pump 9 is operated in the same manner as during the normal combustion described above.

Also, when the circulation pump 9 becomes locked for some reason during combustion and hot water is not circulated and the hot water heat exchanger 8 is overheated, the alarm means 19 issues an alarm, but if some reason occurs. Even if the locked state of the circulation pump 9 is automatically corrected midway due to the cause, if the temperature of the hot water heat exchanger 8 is higher than the set temperature, the heat sensitive element 12 will also keep the alarm circuit 17 closed.
Of course, the circulation pump 9 is not operated, and therefore the temperature of the hot water heat exchanger 8 becomes lower than the set temperature, and the heat-sensitive element 12
When the pump circuit 16 is closed, the low-temperature water is again circulated to the hot water heat exchanger 8 by the circulation pump 9, but at this time, the hot water heat exchanger 8 is at a temperature that generates a loud boiling sound. There is no danger.

Further, when the alarm means 19 issues an alarm, it is also possible to automatically stop combustion by using this invention.

<Effect of the invention> The hot air heating unit 1 is connected to the hot air heat exchanger 4 communicating with the combustion chamber 2 equipped with the combustion burner 3 and the hot air fan 6 blowing air around the outer circumference of the hot air heat exchanger 4. A hot water heating unit 7 is constructed in which a hot water heat exchanger 8 is installed inside the combustion chamber 2, and the hot water heat exchanger 8 is connected to a radiator 11 via a circulation pump 9 that circulates hot water. In a heater configured by the hot water heating unit 7 and the hot air heating unit 1, a heat sensitive element 12 for detecting temperature is provided in the hot water heat exchanger 8, and the heat sensitive element 12 is normally connected to the circulation pump 9. When the pump circuit 16 having the
The pump circuit 16 is connected in series with each circuit 16, 17 so as to switch to the alarm circuit 17 having the alarm circuit 17.
8 are connected in series, so when the hot water heat exchanger becomes dry due to the circulation pump not operating or being unable to operate, water or low temperature water is suddenly transferred to the hot water heat exchanger which is being superheated. This prevents hot water heat exchangers from generating loud boiling noises or vibrations due to the inflow of water or low-temperature water, which may cause damage or disconnection. Prevented.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a conventional example, Fig. 2 is an explanatory diagram of the same, Fig. 3 is an electric circuit of an embodiment of this invention, and Fig. 4 is an electric circuit diagram of a conventional example.
The figure is an explanatory diagram of the same. 1... Warm air heating unit, 2... Combustion chamber, 3...
...Combustion burner, 4...Hot air heat exchanger, 6...Hot air fan, 7...Hot water heating unit, 8...Hot water heat exchanger, 9...Circulation pump, 11...Radiator, 12 ...Thermal element, 16...Pump circuit, 1
7... Alarm circuit, 18... Changeover switch.

Claims (1)

[Scope of utility model registration request] A hot air heating unit 1 is constituted by a hot air heat exchanger 4 that communicates with a combustion chamber 2 equipped with a combustion burner 3, and a hot air fan 6 that blows air around the outer circumference of the hot air heat exchanger 4. A hot water heat exchanger 8 is installed inside the combustion chamber 2, and the hot water heat exchanger 8 constitutes a hot water heating unit 7 connected to a radiator 11 via a circulation pump 9 that circulates hot water. and the warm air heating unit 1 constitute a heater, the hot water heat exchanger 8 is provided with a heat sensitive element 12 for detecting temperature, and the heat sensitive element 12 is connected to a pump circuit 16 having a circulation pump 9 during normal operation. is closed, and when the temperature of the hot water heat exchanger 8 is higher than the set temperature, the alarm means 1
The pump circuit 16 is connected in series with each circuit 16 and 17 so as to switch to the alarm circuit 17 having the alarm circuit 17, and the pump circuit 16 is also provided with at least a switch 1 which is manually opened and closed.
A heater safety device consisting of 8 connected in series.