JPH0220602Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention heats the burner body to the vaporization temperature of liquid fuel with a heater, and ignites the vaporized fuel with an igniter to combust it, thereby creating a heat exchanger. The present invention relates to a heater control device for a floor heating system that generates hot water inside a floor heating system and sends the hot water to a floor heating panel.

(b) Prior Art Conventionally, burner temperature was detected by a burner temperature detection thermistor to control the heater, and hot water temperature was detected by a hot water detection thermistor to control combustion. In other words, a situation occurs in which the heater is energized even when combustion is stopped, resulting in wasted power. Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 55-3545, this problem can be solved by not energizing the heater when the thermoswitch that controls combustion is turned off. In this case, if the temperature of the burner body drops due to fuel supply immediately after combustion starts, there is a concern that combustion will be interrupted and the heater will be re-energized. In addition, there was a concern that increasing the temperature setting of the thermoswitch that detects the temperature of the burner body would delay the start of combustion.

(iv) Purpose of the invention The present invention was developed in view of the above-mentioned facts, and aims to stabilize vaporization combustion immediately after the start of combustion without delaying the start of combustion, while also turning off the heater during combustion stop. The purpose is to save power by not performing control.

(d) Structure of the invention For this purpose, the invention includes a burner temperature detector that detects the temperature of the burner body, a first comparing device that compares the detected temperature of the burner temperature detector with a first set temperature, and a burner temperature detector that detects the temperature of the burner body. a circuit that energizes the heater based on the comparison output of the first comparison device; a second comparison device that compares the detected temperature of the burner temperature detector with a second set temperature lower than the first set temperature; a circuit that performs a combustion operation based on the comparison output of a second comparison device; a hot water detector that detects the temperature of hot water heated by the combustion and supplied to the floor heating panel; and a third comparison device that compares the detected temperature with a third set temperature, and operates the circuit for performing the combustion operation and the circuit for energizing the heater based on the output of the third comparison device. The present invention provides a heater control device for a floor heating device configured to prevent the heating from occurring.

(E) Embodiment An embodiment of the present invention will be described below in detail based on the drawings.
First, 1 is a burner section, and within the burner section 1 are provided a burner body 3 in which a heater 2 (described later) is provided, a burner motor 4, an intake fan (not shown), and an ignition device 5. An intake fan is attached to one rotating shaft of the burner motor 4, and the intake fan rotates when the motor 4 is driven, and the combustion air flows into the intake pipe 6.
Air is taken into the burner section 1 through the. Further, a fuel rotary atomizer is fixed to the other rotating shaft of the burner motor 4 and is installed inside the burner body 3. Fuel entering the oil level regulator 7 from the external oil tank is supplied to the burner body 3 via the supply pump 8. Further, when the ignition device 5 is energized in a state in which the gas is vaporized by the heater 2 and the atomization device, it is mixed with combustion air from the air supply pipe 6 and combusted in the combustion chamber 9. At this time, hot water is produced in the heat exchanger 10 by combustion, and the combustion gas is discharged outdoors through the exhaust pipe 11. Hot water from a heating pipe 10A for raising the temperature of water, which extends through the heat exchanger 10 in a meandering manner, is stored in a hot water storage tank 12. Reference numeral 13 denotes a circulation pump that passes through a hot water supply pipe 14 connected to the bottom of the tank 12, and sends the hot water in the hot water storage tank 12 through an outgoing pipe 15 to a floor panel 17, which is a radiator for floor heating the room outside the machine. . The circulating water from the floor panel 17 is transferred to the heat exchanger 10 through the return pipe 6.
and then heated again.

Next, the control circuit diagram shown in FIG. 2 will be explained. 1
Reference numeral 8 denotes a burner temperature detection thermistor as a burner temperature detector for detecting the temperature of the burner body 3, and its resistance value decreases as the temperature increases.
19 and 20 are resistors, which are connected to the DC power supply VDD via the thermistor 18. 21 and 22 are also connected to the DC power supply VDD through resistors, and the inverting input terminal of the comparator A23 as the first comparator is connected to the connection point A between the thermistor 18 and the resistor 19, and also serves as a non-inverting input terminal. are the resistors 21 and 2
It is connected to connection point B with 2. The inverting input terminal of the comparator B24 as a second comparator is connected to the connection point C between the resistors 19 and 20, and the non-inverting input terminal is connected to the resistor 2 connected to the DC power supply VDD.
It is connected to the connection point D between 5 and 26. Therefore, because of the resistor 19, the output of the comparator B24 is inverted earlier than the output of the comparator B24 due to the temperature rise. The output terminal of the comparator A23 is connected to the gate of a transistor A28 through a resistor 27, and the collector of the transistor A28 is connected to a DC power supply VCC through a coil 29A of a heater relay 29. The switch 29B of the relay 29 is normally open, and the heater 2 for heating the burner body 3 to the vaporization temperature of the liquid fuel is energized when the switch 29B is closed.

Further, the output terminal of the comparator B24 is connected to the gate of the transistor B31 via a resistor 30,
The collector of the transistor B31 is connected to the combustion relay 3.
It is connected to the DC power supply VCC via the No. 2 coil 32A. The relay 32 is a switch 32B, 3
2C and 32D, which are connected to the burner motor 4, the ignition device 5, and the supply pump 8, respectively, and their series circuit is provided between the AC power lines 34, 34.

A hot water detection thermistor 35 serves as a hot water detector for detecting the temperature of the hot water produced in the heat exchanger 10, and is connected to the DC power supply VDD via a resistor 36. The connection point E between the thermistor 35 and the resistor 36 is connected to the inverting input terminal of a comparator C37 as a third comparator, and the connection point F between the resistors 38 and 39 connected to the DC power supply VDD is a non-inverting input. connected to the terminal. A diode 41 is provided between a connection point G between the comparator A23 and the resistor 27 and a connection point H between the comparator C37 and the resistor 40, and the cathode side of the diode 41 is connected to the connection point H.
connected to. 42 is also a diode, which connects the connection point I between the resistor 30 and the transistor B31 and the resistor 40.
The cathode side is connected to the resistor 40 between the resistor 40 and the resistor 40 .

The operation of the above configuration will be explained below.
First, immediately after the power is turned on, the burner temperature detection thermistor 18 detects that the temperature of the burner body 3 is lower than the first set temperature, so the potential at the connection point A is lower than the potential at the connection point B, and the comparator A23 is at a high level. is output, transistor A28 becomes conductive, and heater relay 29 is energized, so that switch 29
Since B is closed, the heater 2 is energized. For this reason, the burner body 3 is warmed, so the resistance value of the burner temperature detection thermistor 18 gradually decreases, and the detected temperature eventually reaches the second set temperature lower than the first set temperature, and the potential of the connection point C changes to the connection point D. , the output of comparator B24 changes from low level to high level, and transistor B31
Since a high level output is applied to the gate of
B, 32C, and 32D are closed. Therefore, the burner motor 4, the ignition device 5, and the supply pump 8 are energized, and the fuel supplied by the supply pump 8 is atomized by the rotary atomizer, vaporized by the heated burner body 3, and ignited by the ignition device 5 for combustion. is started. Then, the heat exchanger 10 is heated, and the hot water in the heating pump 10A is supplied to the hot water storage tank 12 and sent to the floor panel 17 by the circulation pump 13 via the hot water supply pipe 14. This performs floor heating, and the heat is again supplied to the heat exchanger 10 through the tufted pipes 16, thereby performing such circulation. After that, when the temperature of the burner body further increases due to combustion and reaches the first set temperature or higher, the output of the comparator A23 becomes low level.
Since the excitation of the heater relay 29 is released, the energization of the heater 2 is cut off, thereby preventing unnecessary energization.

Floor heating is performed in this way, but when the hot water produced in the heat exchanger 10 exceeds the third set temperature, the resistance value of the hot water detection thermistor 35 decreases, so the potential at the connection point E decreases. Since the potential becomes lower than the potential of F, the comparator C37 changes from a high level output state to a low level output state. The comparator C
Due to the low level output of 37, diodes 41,
42 is conductive, and transistor A28 and transistor B are turned on regardless of the outputs of comparator A23 and comparator B24.
31 are both non-conductive. Therefore, the switch 29B of the heater relay 29 is opened, and the heater 2 is de-energized, and the combustion relay 32 is also demagnetized, and its switches 32B, 32C, and 32D are opened, and the burner motor 4, ignition device 5, and supply pump 8 are de-energized, and the combustion stops. Of course, if the temperature of the burner body 3 is lower than the first set temperature, the comparator A
23 outputs a high level, and when the hot water detection thermistor 35 detects that the hot water temperature is lower than the third set temperature, its resistance value is large, so the comparator C37 outputs a high level. 42 becomes non-conductive. Therefore, the transistor A28 and the transistor B31 become conductive, and the heater 2, burner motor 4, ignition device 5, and supply pump 8 are energized, and combustion starts again.

(f) Effects of the invention As explained above, the present invention is such that after the temperature of the burner body reaches the second set temperature and starts combustion, the temperature of the burner body is equal to or higher than the first set temperature, which is higher than the second set temperature. Since the heater is energized until It is possible to stabilize vaporization combustion immediately after the start of combustion without delaying it.
Moreover, when the hot water temperature of the floor heating panel exceeds the third set temperature, combustion is stopped regardless of the burner body temperature, and at the same time, heater control is disabled, resulting in power savings. In addition to reducing the number of times the heater is turned on and off, it is also possible to prevent welding of the heater's energization control contacts.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a floor heating system to which the control device of the present invention is applied, and FIG. 2 is an electric circuit diagram showing the control device of the present invention. 2... Heater, 3... Burner body, 5... Ignition device, 10... Heat exchanger, 17... Floor panel (floor heating panel), 18... Burner temperature detection thermistor (burner temperature detector), 23 ...Comparator A
(first comparison device), 24... Comparator B (second comparison device), 35... Hot water detection thermistor (hot water detector), 37... Comparator C (third comparison device).

Claims (1)

[Scope of utility model registration request] The burner body is heated to the vaporization temperature of liquid fuel by a heater, and the vaporized fuel is ignited and combusted by an ignition device to create hot water in a heat exchanger, and this hot water is sent to the floor heating panel. In the heating device, a burner temperature detector that detects the temperature of the burner body, a first comparison device that compares the detected temperature of the burner temperature detector and a first set temperature, and a comparison output of the first comparison device. a circuit that energizes the heater based on; a second comparison device that compares the detected temperature of the burner temperature sensor with a second set temperature lower than the first set temperature; and a comparison output of the second comparison device. a hot water detector that detects the temperature of hot water heated by the combustion and supplied to the floor heating panel; a temperature detected by the hot water detector; and a third set temperature. and a third comparison device for comparing the output of the third comparison device, and is configured to prevent the operation of the circuit for performing the combustion operation and the circuit for energizing the heater based on the output of the third comparison device. Features: Heater control device for floor heating equipment.