JP2001050534A - Control device for heat source machine for heating hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a heat source machine for heating hot water having a burner protecting function to prevent a burner body temperature from a rise to a high temperature. SOLUTION: This device comprises a burner 9 to vaporize liquid fuel for combustion; a water heat-exchanger 7 to produce hot water through heating by the burner 9; and a hot water temperature sensor 5 to detect the hot water temperature of the water heat-exchanger 7, and combustion of the burner 9 is controlled based on the detecting temperature of the hot water temperature sensor 5. In a so formed heat source machine for heat hot water, a burner body 27 of a burner 9 is provided with a burner temperature 31 to detect the temperature of the burner body 27. When the detecting temperature of the burner temperature sensor 31 is increased to a value higher than a given temperature, combustion of the burner 9 is forcibly brought into an OFF-state. After combustion of the burner 9 is forced into an OFF-state by the burner temperature sensor 31, combustion of the burner 9 is restarted based on the detecting temperature of the hot water temperature sensor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hot water heating heat source device for heating by circulating hot water through a radiator such as a floor heating panel or a fan convector.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional heat source system for hot water heating. 1 is a heat source device, 2 is a radiator, 3 is a hot water pipe, 4 is a header (hot water distributor), which is configured to circulate hot water generated by the heat source device 1 in the radiator 2 for heating. In the hot water heating heat source device 1 system, for example, when the load is high, such as when all the radiators 2 are operating, the heat source device 1 (burner) performs a maximum combustion operation (hereinafter, referred to as a high combustion operation), and one radiator At a low load when only 2 is operating, the heat source device 1 is an operation control method of performing ON and OFF operations (hereinafter referred to as low combustion operation) with a minimum combustion operation.

A temperature sensor for detecting the temperature of hot water is mounted in the heat source unit 1, and a control circuit for controlling the combustion of the burner based on the temperature detected by the temperature sensor is provided.
This control circuit switches to perform a high combustion operation when the temperature detected by the temperature sensor is low, and to perform a low combustion operation when the detected temperature is high.

[0004]

When a burner having a burner head or the like used in a configuration in which a combustion flame is emitted horizontally is incorporated as a heat source unit, a component for fixing the burner head horizontally is a heat source. There is a problem that the burner head is tilted to cause partial heating due to the influence of deterioration and the like. If the burner main body becomes abnormally high temperature due to the partial heating of the fixing bracket, the burner main body may be deformed or a flashback phenomenon in which a flame enters the inside of the burner may be caused. If the burner body is deformed, it requires a great deal of labor for repair, and the burner cannot be reused.

The present invention has been made to solve the above-mentioned conventional problems, and has a burner protection function for detecting a temperature of a burner body and preventing the temperature of the burner body from being abnormally high. The purpose of the present invention is to provide a machine control device.

[0006]

In order to achieve the above object, an invention according to claim 1 includes a burner for vaporizing and burning a liquid fuel, a water heat exchanger heated by the burner to obtain hot water, A hot water temperature sensor for detecting the temperature of the hot water of the water heat exchanger, wherein the combustion of the burner is controlled based on the temperature detected by the hot water temperature sensor. The main body is provided with a burner temperature sensor for detecting the temperature of the burner main body. When the detected temperature of the burner temperature sensor is equal to or higher than a predetermined temperature or exceeds a predetermined temperature, the combustion of the burner is forcibly stopped by O.
After the FF is performed and the burner combustion is turned off by the burner temperature sensor, the burner combustion is restarted based on the temperature detected by the hot water temperature sensor.

According to a second aspect of the present invention, there is provided a burner which vaporizes and burns a liquid fuel, a water heat exchanger which is heated by the burner to obtain hot water, and a hot water temperature sensor which detects hot water temperature of the water heat exchanger. And a forced combustion switch, and controls the combustion of the burner based on the temperature detected by the hot water temperature sensor, and detects the temperature of the hot water temperature sensor during the forced combustion operation when the forced combustion switch is turned on. In the heat source device for hot water heating configured to control the combustion of the burner independently, the burner determines that the burner body of the burner has exceeded or exceeded a first predetermined temperature during the forced combustion operation. When the temperature sensor detects, the combustion of the burner is forcibly turned off, and when the temperature is lower than a second predetermined temperature lower than the first predetermined temperature or lower than the second predetermined temperature, the combustion is stopped. It is obtained so as to resume.

According to a third aspect of the present invention, in the control device for a hot water heating heat source unit according to the first or second aspect, the burner main body is provided with a ceramic head.

According to a fourth aspect of the present invention, in the control apparatus for a hot water heating heat source unit according to the first or second aspect, the burner discharges the combustion flame laterally to a connecting cylinder formed in a lateral portion of a combustion chamber. It is set up so that.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a heat source unit for hot water heating according to the present invention with a front panel removed. Note that the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 6 is a casing, 7 is a water heat exchanger, 8 is a combustion chamber, and 9 is a burner. A water heat exchanger 7 is connected to an upper portion of a combustion chamber 8 disposed inside the box-shaped casing 6, and one end of a burner case 12 having a burner 9 is connected to a side portion of the combustion chamber 8. A fan case 16 is connected to the other end of the burner case 12, and accommodates therein a blower 15 composed of a fan 13 for supplying combustion air to the burner 9 and a burner motor 14 for driving the fan 13. .

Numeral 17 denotes an oil leveler for storing liquid fuel such as kerosene. Liquid fuel such as kerosene in the oil leveler 17 is pumped up by a fuel pump 18 such as an electromagnetic pump and supplied to the burner 9 through an oil feed pipe 21. Reference numeral 22 denotes an external radiator 2 such as a floor heating panel for supplying hot water heated by the water heat exchanger 7.
Circulation pump. Reference numeral 23 denotes a control circuit board, which is controlled by the control circuit provided therein.
The combustion is controlled so that the temperature of the hot water flowing out of the crow becomes a set value (can be set to 40 ° C to 77 ° C).

FIG. 2 is an enlarged sectional view showing the burner and the combustion chamber of FIG. 7 is a water heat exchanger, 8 is a combustion chamber,
9 is a burner, 15 is a blower. One end of the burner case 12 is screw-connected to a connection cylinder 24 formed on the side of the combustion chamber 8.

The burner 9 is a variable combustion type rotary gasification burner that vaporizes and burns liquid fuel such as kerosene.
The flame hole is provided sideways toward the combustion chamber 8. A ceramic burner head 25 is fitted into the flame hole,
One end of the burner head 25 is pressed by a secondary ring 26 fixed to a joint portion between the connecting cylinder 24 and the burner case 12 and is fixed horizontally. Reference numeral 27 denotes a burner body (burner body) such as a vaporizing cylinder. An electric heater 28 for vaporization is buried inside the burner body 27, and the electric heater 28 is energized at the time of ignition to increase the temperature of the burner body 27. Reference numeral 31 denotes a burner thermistor (burner temperature sensor) attached to the burner body 27 for temperature detection. Reference numeral 33 denotes an exhaust pipe, and the exhaust gas flowing into the exhaust pipe 33 is discharged outside through an exhaust pipe 34.

The operation of the heat source unit 1 is started, and the electric heater 2
8, the temperature of the burner body 27 becomes approximately 210
When the temperature reaches ° C, the burner thermistor 31 detects the temperature and the burner motor 14 operates to perform pre-purge. The operation of the blower 15 by the burner motor 14 causes air to be sent into the burner case 12.

A few seconds after the operation of the blower 15 starts, the fuel pump 18 starts operating, and liquid fuel is supplied into the burner body 27 from a fuel nozzle (not shown). The liquid fuel supplied to the burner body 27 is supplied to the burner body 2.
7 and is instantaneously vaporized, mixed with the primary air, sent to the burner head 25 and ejected from the flame hole,
It is ignited by the spark of the spark plug and forms a flame in the flame hole to start combustion.

When the combustion is started, the heat of the flame is conducted to the burner body 27 to recover the heat. When the temperature of the burner body 27 reaches about 269 ° C., the power supply to the electric heater 28 is stopped. I do. Even if the energization of the electric heater 28 is stopped,
The burner body 27 is maintained at a high temperature.
The liquid fuel supplied to the inside continues to evaporate and the combustion state continues. The temperature of the burner body 27 is maintained at a temperature of 280 ° C. to 330 ° C.

FIG. 3 is a control block diagram for preventing overheating of the burner. Reference numeral 35 denotes a power supply, 36 denotes a control circuit, 18 denotes a fuel pump, 9 denotes a burner, and 7 denotes a water heat exchanger. When the combustion is started by the operation switch 37, the temperature of the hot water is detected by the hot water thermistor 5 attached to the water heat exchanger 7, and the control circuit 36 controls the combustion of the burner 9 based on this temperature. By controlling the combustion, the temperature of the hot water is increased by 3 deg. From minus 8de
g. Is kept between The temperature of the burner body 27 is detected by the burner thermistor 31, and the detected temperature is determined by the control circuit 36. If the temperature of the burner body 27 becomes abnormally high for some reason, the control circuit 36 determines that the temperature is abnormal, the fuel pump 18 is stopped, the supply of fuel to the burner 9 is stopped, and the combustion is stopped.

The control device 36 of the burner 9 is provided with a forced combustion switch 41, which is used for confirming and inspecting the flame of the burner 9. This forced combustion switch 41
Is operated to switch the mode between the forced operation (forcible combustion operation) and the normal operation. In the forced operation mode, it is separated from the normal combustion operation for heating hot water,
Only combustion of the burner 9 can be performed. The forced operation includes high combustion and low combustion.

FIG. 4 shows normal operation (when the forced operation switch is set to O
4 is a control flowchart for preventing overheating of the burner body 27 of FF). When the combustion operation is started, the combustion of the burner 9 is started in step S1. Step S
In 2, the hot water thermistor 5 detects the hot water temperature,
The hot water temperature is 3 deg. If it is higher than, the process proceeds to step S6, and the combustion is stopped. Thereafter, the process proceeds to step S7, and the hot water temperature is set to 8 deg.
If it is determined that the temperature has decreased, combustion is restarted. In step S2, the hot water temperature is equal to the set temperature plus 3 de.
g. In the following cases, the process proceeds to step S3. In step S3, the temperature of the burner body 27 is always detected by the burner thermistor 31, and the control circuit 36 determines this temperature. Here, when the temperature of the burner body 27 is 370
℃ (first predetermined temperature) or more, it is determined to be abnormal,
Move to step S4. In step S4, the control circuit 36 stops the fuel pump 18, the supply of fuel to the burner 9 is stopped, and the combustion is stopped. At the same time, the control circuit 36 sets the hot water temperature to 3 deg. Is kept high. For one and a half minutes after the burner 9 is turned off, air is blown from the blower 15 to the burner 9 and the burner body 27 is cooled. Proceeding to step S5, the hot water temperature becomes 8 deg. When it is determined that the temperature has decreased, combustion is restarted.

FIG. 5 is a control flowchart for preventing overheating of the burner body 27 during forced operation. When the combustion operation is started, the combustion of the burner 9 is started in step S1. In step S8, the temperature of the burner body 27 is always detected by the burner thermistor 31, and the detected temperature is determined by the control circuit 36. Here, if it is determined that the temperature of the burner body 27 has risen to 370 ° C. or higher, it is determined that an abnormality has occurred, and the process proceeds to step S9. In step S9, the control circuit 36
Is stopped, the supply of fuel to the burner 9 is stopped, and the combustion is stopped. For one and a half minutes after the burner 9 is turned off, air is blown from the blower 15 to the burner 9 and the burner body 27 is cooled. In step S10, when the temperature of the burner 9 is equal to or higher than 250 ° C. (second predetermined temperature), the combustion is stopped, and when the temperature is lower than 250 ° C., the combustion is restarted.

The present invention has been described based on one embodiment, but the present invention is not limited to this. The burner thermistor 31 may be another temperature sensor such as a thermistor, a thermocouple, or a positive temperature coefficient thermistor as long as the control circuit 36 can determine the detected temperature.

The numerical values shown in the present embodiment are not limited to those described above, and are set appropriately according to the capabilities of the devices.

[0024]

As described above, according to the first aspect of the present invention, in the hot water heating heat source device that controls the combustion of the burner based on the value of the hot water temperature sensor, the burner body has an abnormally high temperature. Occasionally, combustion is stopped by the value of the burner temperature sensor attached to the burner body, and then, after the burner temperature has dropped, combustion is restarted by the hot water temperature sensor, which hinders normal hot water heating operation. The burner body can be protected from abnormally high temperature without giving.

According to the second aspect of the present invention, even in the forced combustion operation in which the combustion of the burner is controlled regardless of the value of the hot water temperature sensor, the value of the burner temperature sensor is detected and the combustion is stopped. Can be protected from abnormally high temperatures.

According to the invention described in claim 3 or 4,
Even with a burner equipped with a ceramic head and installed so that the combustion flame is emitted sideways, the burner body can be protected from abnormally high temperatures by attaching a burner temperature sensor to the burner body, making burner protection easy. Can be.

[Brief description of the drawings]

FIG. 1 is a front view of a heat source unit for hot water heating according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing the burner and the combustion chamber of FIG. 1 in an enlarged manner.

FIG. 3 is a block diagram illustrating overheat prevention control according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating overheat prevention control during normal operation according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating overheat prevention control during forced operation according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional heat source system for hot water heating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat source device for hot water heating 5 Hot water thermistor (hot water temperature sensor) 6 Casing 7 Water heat exchanger 8 Combustion chamber 9 Burner 15 Blower 17 Oil leveler 18 Fuel pump 22 Circulation pump 23 Control circuit board 24 Connecting cylinder 25 Ceramic head 27 Burner body ( Burner body) 28 electric heater 31 burner thermistor (burner temperature sensor) 36 control circuit (control device) 37 operation switch 41 forced combustion switch

Continuation of front page (72) Inventor Hiroyuki Ieda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (reference) 3K005 AA06 AB02 AB12 AC06 BA05 CA05 DA01 EA02

Claims (4)

[Claims] 1. A burner for vaporizing and burning a liquid fuel, a water heat exchanger heated by the burner to obtain hot water,
A hot water temperature sensor for detecting a hot water temperature of the water heat exchanger, wherein the combustion of the burner is controlled based on a temperature detected by the hot water temperature sensor. The main body is provided with a burner temperature sensor for detecting the temperature of the burner main body, and when the detected temperature of the burner temperature sensor is equal to or higher than a predetermined temperature, or exceeds a predetermined temperature, forcibly turns off the combustion of the burner, and ,
After the combustion of the burner is turned off by the burner temperature sensor, the combustion of the burner is restarted based on the temperature detected by the hot water temperature sensor. 2. A burner for vaporizing and burning liquid fuel, a water heat exchanger heated by the burner to obtain hot water,
A hot water temperature sensor for detecting the temperature of the hot water of the water heat exchanger, and a forced combustion switch, which controls the combustion of the burner based on the temperature detected by the hot water temperature sensor, and the forced combustion switch is turned on. During the forced combustion operation, the burner body of the burner is controlled to a first predetermined temperature during the forced combustion operation, in which the combustion of the burner is controlled independently of the temperature detected by the hot water temperature sensor. Above or when the burner temperature sensor detects that the temperature exceeds the first predetermined temperature, the combustion of the burner is forcibly turned off and the second predetermined temperature lower than the first predetermined temperature or lower, or A controller for restarting combustion when the temperature is lower than a predetermined temperature. 3. The control device for a hot water heating heat source device according to claim 1, wherein the burner main body is provided with a ceramic head. 4. The hot water heating system according to claim 1, wherein the burner is installed in a connecting cylinder formed in a lateral portion of a combustion chamber so that a combustion flame is discharged in a horizontal direction. Control device for heat source unit.