JPS6225621Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot water boiler, and in particular to a temperature control device section thereof.
Detects the temperature rise gradient of hot water after the hot water thermo circuit operates, and when the temperature rises due to overshoot after normal operation, the operation of the safety thermo circuit is stopped, and the operating point of the hot water thermo circuit is raised to release hot water. It increases the temperature.

Hot water boilers generally have a hot water thermo circuit and a safety thermo circuit that operates when the hot water thermo circuit malfunctions, and the operating temperature of both is limited by the temperature rise due to overshoot after combustion is stopped by the operation of the hot water thermo circuit. Considering that a certain temperature difference is required, and considering conditions such as not boiling when the safety thermocircuit is activated, the operating temperature of the hot water thermocircuit becomes extremely low, resulting in a drop in the hot water temperature. had.

The present invention has been made to improve these drawbacks. That is, when the first hot water thermo circuit that controls the combustion control circuit operates, its output drives the timer circuit, and after a certain period of time, the second hot water thermocircuit is set to a temperature higher than that of the first hot water thermo circuit. The above-mentioned drawbacks are solved by detecting whether the thermocircuit operating point has been reached and, if not, disabling the safety thermocircuit.

One embodiment will be described below with reference to the drawings.

In Fig. 1, 1 is a power supply for control, 2 is a keep relay, 3 is a diode, 4 is a comparison detector for a safety thermo circuit, 5 is a temperature detection thermometer, 6 -
8 is a resistor, and 2 to 8 above constitute a safety thermocircuit A. 9 is a transistor, 10 to 12 are resistors 13 are comparison detectors, 14 to 17 are resistors, 18 is a temperature detection thermistor, 19 is a comparison detector, 1
4 to 19 are first hot water thermocircuit B, 13 to 18
This constitutes a second hot water thermocircuit C having an operating point higher than that of the first hot water thermocircuit.
20 to 22 are resistors, 23 are transistors, 24 are combustion control circuits, 25 and 26 are diodes, 27 are combustion control relays, 28 are capacitors, 29 to 3
1 is a resistor, 32 is a comparison detector, and 28 to 32 constitute a timer circuit D that operates after the first hot water thermocircuit B operates. 33 to 37 are resistors, 38 is a comparison detector, and 39 and 40 are diodes.

Figure 2 shows the load side circuit, 41 is the load power supply, 4
2 is a normally closed contact of the keep relay 2, 43 is a normally open contact of the combustion control relay 27, and 44 is a combustor.

To explain the operation of the device having the above configuration, first, when the hot water temperature is low, the resistance value of the temperature detection thermistor 18 is large, so the potential of the comparison detector 19 is determined by the resistors 15, 16, and 17. higher than the potential, i.e. the output of the comparison detector 19 is in the 0 state, the transistor 23 is connected to the resistors 20, 21
The base current flows through the switch, and power is supplied to the combustion control circuit 24, so the relay 27 is energized.
The contact 43 is closed, and the combustor 44 starts operating and burning. Also, in this state, since the capacitor 28 is not charged, the timer circuit D
The output of maintains the 1 state. The operation of the second hot water thermocircuit C, which has an operating point higher than that of the first hot water thermocircuit B, is determined by the potentials of the resistors 15, 16 and 17, and since the potential is high as described above, the output of the comparison detector 13 is is 0 state, next stage comparison detector 38
The output of the timer circuit D also becomes 0 state, and the base current tries to flow to the transistor 9 through the resistors 10 and 11, but the output of the timer circuit D, that is, the comparison detector 32
Since the output of is in the 1 state, the base current of the transistor 9 does not flow, and the transistor 9 is in the OFF state.
In other words, the safety thermo circuit A consists of 2 to 8.
is in a ready state. However, since the temperature is low, the potential determined by the resistor 6 and temperature detection thermistor 5 is higher than the potential determined by the resistors 7 and 8, and the output of the comparison detector 4 is in the 0 state, that is, the keep relay does not operate. Combustion therefore continues.

Next, when the hot water temperature of the boiler rises, the resistance value of the temperature detection thermistor 18 becomes small, and the potential becomes lower than the potential determined by the resistors 15, 16, and 17, the output of the comparison detector 19 is reversed to the 1 state.
Transistor 23 is turned off. In other words, the combustion control circuit 24 is OFF, the relay 27 is de-energized,
Contact 43 becomes open and combustion stops. At this point, charging of the capacitor 28 through the resistor 29 is started, and the timer circuit D is activated. After a set time determined by capacitor 28 and resistors 29-31, the output of comparison detector 32 is inverted to the 0 state. Also, the second hot water thermo circuit C, which has an operating point higher than that of the first hot water thermo circuit, has a resistance of 15 at this point.
Since the potential is higher than the potential determined by 16 and 17, the output of the comparison detector 13 is in the 0 state, and the comparison detector 38 at the next stage is also in the 0 state. In other words, the base current flows through the resistors 10 and 11 in the transistor 9, and the transistor 9 is turned on. When the transistor 9 is turned on, the potential of the comparison detector 4 is lowered to a level via the diode 40, so that the output remains at 0. In other words, the operation of the safety thermo circuit A is stopped. Similarly, the potential of the comparison detector 38 is lowered to the level via the diode 39, and the potential of the comparison detector 38 is lowered to the level
8 is energized to prevent the transistor 9 from turning OFF due to the operation of the second hot water thermo circuit C after the timer setting time has elapsed.

If the first hot water thermo circuit B continues to operate due to a disconnection failure of the temperature detection thermistor 18, the output of the timer circuit D, that is, the output of the comparison detector 32, remains in the 1 state, and the transistor 9 remains in the 1 state.
Since it is in the OFF state, when the temperature detection thermistor 5 reaches the safe thermo-operating temperature, the output of the comparison detector 4 becomes 1 state, and the keep relay 2 is activated.
Contact 42 is opened to stop combustion.

In this way, the present invention changes the temperature rise gradient of hot water after the operation of the first hot water thermocircuit by using a timer circuit that operates after the operation of the first hot water thermocircuit and a second hot water thermocircuit having an operating point higher than that of the first hot water thermocircuit. The safety thermo circuit is detected by the hot water thermo circuit, and the safety thermo circuit is not activated when there is an upward slope due to overshoot after normal operation, so the operating temperature of the hot water thermo circuit can be increased, and the hot water temperature can be increased. can. Additionally, if the hot water thermocircuit malfunctions, combustion can be stopped by operating the safety thermocircuit. Furthermore, even if the hot water thermocircuit is operating normally, but combustion continues for some reason, the safety thermocircuit can be activated to stop the combustion.

[Brief explanation of the drawing]

1 and 2 are electrical circuit diagrams of a hot water boiler according to an embodiment of the present invention. A... Safety thermo circuit, B, C... 1st, 2nd
hot water thermo circuit, D... timer circuit.

Claims (1)

[Scope of utility model registration request] at least one temperature detection means for detecting hot water temperature; and a temperature detected by the temperature detection means;
a first hot water thermocircuit that stops the combustor and starts a timer when the temperature is higher than the first set temperature, and a second set temperature that is higher than the first set temperature; and a second hot water thermo circuit that outputs when
The hot water boiler is provided with a safety thermo circuit that stops the combustor when hot water is higher than a second set temperature after the timer times up based on the output of the timer and the second hot water thermometer.