JP2585699Y2 - Combustor control device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a control device for preventing the spread of offensive odor into a room at the time of an ignition operation of a combustor.

[Prior Art] Based on an ignition operation signal for closing an operation switch,
2. Description of the Related Art There has been known a start-up timer for holding each component required for ignition until an ignition operation is enabled and performing a preheating operation. When the start timer finishes counting, since each part is in an ignitable state, the combustion air supply fan is energized to send combustion air to the burner, and the fuel supply unit including the solenoid valve and the fuel pump is energized. Then, the fuel is sent to the burner, and the burner starts burning by the ignition device.

There is a combustor that discharges combustion exhaust gas generated from the burner to an air flow path provided in a frame of the combustor and guides the combustion exhaust gas into a room by a convection fan that blows the air flow path to discharge the combustion exhaust gas. At this time, there is a combustor in which a convection fan that discharges indoor air is energized for a certain period of time after ignition to prevent odor at the time of ignition from spreading to the surroundings.

[Problems to be Solved by the Invention] On the other hand, the time required from the ignition operation for opening the operation switch to the start of energization of the fuel supply unit should be different depending on the state of the combustor. At the time of first use when starting operation at a low temperature, and at the time of re-operation when starting operation when the combustor is at a high temperature, each part used in the burner is in an operable state. In particular, in a combustor that operates a preheater using petroleum as a fuel, the time required until the fuel can be gasified varies depending on the ambient temperature.

The longer operation time of the start timer is not particularly problematic in the prior art because it has a certain advantage in that the reliability of ignition increases. However, recently, as a means for reducing the offensive odor at the time of ignition, a convection fan timer is provided so that the operation start of the convection fan does not coincide with the operation start of the burner, so that the convection fan is not energized for a predetermined time after ignition. Has been proposed.

If this mechanism is incorporated in the combustor, the convection fan will not operate immediately when the burner is ignited. When the combustion is started, the generated combustion heat accumulates in the combustor, and the internal temperature of the combustor abnormally rises after ignition, which may cause a dangerous situation. Usually, a safety device such as a high limit switch for detecting such an abnormal condition in advance is provided, and the safety device is activated, and the combustor may suddenly extinguish after ignition.

Means for Solving the Problems The present invention relates to a combustor control device for obtaining stable combustion while minimizing the generation of offensive odor at the time of ignition, comprising a burner in the combustor frame, and an operation switch. The start timer 3 is operated based on an ignition operation signal for closing the circuit 6, the fuel and the combustion air are supplied to the burner by the output signal of the start timer 3 to start combustion, and the combustion exhaust gas generated from the burner is combusted. In the combustor provided with the convection fan 4 for guiding the exhaust gas from the inside of the frame into the room, based on the temperature sensor 1 for detecting the temperature of the combustor operated by the closing signal of the operation switch 6 and the temperature data detected by the temperature sensor 1 Timer 3 for variably setting the operation start time of the fuel supply device 2 and a convection fan type for controlling a convection fan operated by a signal of the start timer 3 for starting combustion of the burner. The convection fan timer 5 operates the convection fan 4 at a high speed after a lapse of a predetermined time from the start of combustion of the burner, and gives a temperature dependency to the time from the ignition operation to the start of combustion by the start timer 3. It is a thing.

Further, the convection fan 4 whose operation is stopped by the convection fan timer 5 supplies electricity to the low-speed rotation terminal of the convection fan 4 when the temperature sensor 1 detects a high temperature, so that the convection fan 4 operates at a low speed. In operation, not only the preheating time is shortened, but also when the burner starts burning, the convection fan rotates slowly and exhausts the heat of the combustor, and the inside of the frame could be kept at a low temperature. is there.

[Operation] When an ignition operation signal for closing the operation switch 6 is output, the start timer 3 starts counting, and when the components required for ignition reach the ignition operation temperature, the start timer 3 stops counting. . Then, when the start timer 3 which has finished counting starts the operation of the fuel supply device 2, the burner is supplied with fuel and starts burning. This ignition operation can be performed even when the set time of the start timer 3 is long. However, combustion is not stable, and incomplete combustion gas may be generated.

A general countermeasure for this is to provide a convection fan timer 5 to delay the operation of the convection fan 4 for a predetermined time after ignition, and the incomplete combustion gas generated at the time of ignition goes out of the combustor together with the combustion gas. It flows upward due to natural convection. When the convection fan timer 5 energizes the convection fan 4, it is after the incomplete combustion state at the time of ignition is eliminated, and the incomplete combustion gas is exchanged with the indoor air and combustion gas blown out as warm air to the front of the combustor. A comfortable warm air can be obtained.

On the other hand, when the temperature of the combustor is high due to re-ignition operation, etc.,
Each part required for ignition is close to the ignition operating temperature,
When the start-up timer 3 finishes counting, the temperature of each component is abnormally high and the operation of the convection fan 4 is stopped by the instruction of the convection fan timer 5, so that the combustion heat accumulates in the combustor and the safety device It may work.

In the present invention, the temperature sensor 1 for detecting the temperature of the combustor determines the temperature of the combustor. Based on this temperature data, the set time of the start-up timer 3 is set longer than when the temperature is high. It is set to be short. That is, when the temperature sensor 1 detects a high temperature, since the components necessary for ignition are close to the ignition operating temperature, the start-up timer 3 can start the operation of the fuel supply device 2 to start combustion in a short time. Yes, and the combustor will not rise to abnormal temperatures by the time the convection fan 4 operates.

Further, the convection fan 4 has a rotation speed changing means. When the temperature sensor 1 detects a high temperature, the convection fan 4 can be operated at a low speed without stopping the convection fan 4 without stopping. If normal high-speed operation can be performed after the counting is completed, a large amount of cold air will not be blown out of the combustor after ignition without stopping the convection fan 4, and comfort can be obtained.

[Embodiment] Hereinafter, the configuration will be described with reference to the drawings showing an embodiment. Reference numeral 6 denotes an operation switch for generating an ignition operation signal for the combustor, 3 denotes a start timer which starts operation when the operation switch 6 is closed, and 7 denotes ignition. This is a preheater that also serves as an ignition necessary to perform the operation. The ignition operation of the combustor is performed by closing the operation switch 6, and energizes the start timer 3 and the preheater 7.

Numeral 10 is a combustion air supply fan for supplying combustion air to a burner installed in the frame of the combustor, and 2 is a fuel supply device for supplying fuel to the burner. The pumping system is composed of a pulse-driven electromagnetic pump. Reference numeral 3a denotes a timer contact of the start-up timer 3. When the start-up timer 3 counts up, the components necessary for ignition are already in the state of ignition operation, and the timer contact 3a is switched to supply the combustion air. The fan 10 and the fuel supply device 2 are operated, and the fuel and air sent to the burner are ignited by the preheater 7 which is also used for ignition, and combustion starts.

Reference numeral 4 denotes a convection fan for blowing air into an air flow path provided in the frame of the combustor. In this type of combustor, combustion exhaust gas generated from a burner is exhausted to the air flow path. Is blown out from the front of the combustor to induce exhaust into the room. Reference numeral 5 denotes a convection fan timer which starts counting instead of counting when the start-up timer 3 counts up. Reference numeral 5a denotes a fan timer first contact provided in a circuit of the preheating heater 7,
For example, 15 seconds after the activation timer 3 counts up, the first contact point 5a of the fan timer is switched, and the power supply to the preheating heater 7 is stopped.

5b is a fan timer second contact provided in the circuit of the convection fan 4, and the incomplete combustion gas generated from the burner immediately after ignition and flowing out to the air flow path rises immediately above the combustor by natural convection. When the convection fan 4 starts high-speed operation by switching the fan timer second contact 5b, there is no incomplete combustion gas in the combustion gas discharged from the front of the combustor. Even when the gas is forcibly blown, the odor at the time of ignition does not spread around the combustor.

In a combustor with such a configuration, the burner and the like operate satisfactorily during the first ignition operation when the burner or the like is cold, without spreading offensive odors. In this case, when the preheater 3 is energized by the start timer 3, each component is heated to a high temperature. After the burner starts burning, the convection fan 4 does not operate until the convection fan timer 5 counts up, so that the combustion gas discharged to the air flow path in the frame remains in the combustor frame. However, the safety device may operate due to the abnormally high temperature, and the combustor may be shut down in an emergency.

Reference numeral 1 denotes a temperature sensor for detecting the temperature of the combustor at the time of operation based on an ignition operation signal of the operation switch 6, reference numeral 8 denotes a sensor element constituting a temperature detection unit of the temperature sensor 1, and reference numeral 9 denotes a relay for accidentally holding the operation of the sensor element 8. The relay contact 9a of the relay 9 and the sensor element 8 are connected in parallel.

When the sensor element 8 is energized to the relay 9 at low temperature, the relay 9 is also energized from the relay contact 9a of the activated relay 9 to be in a self-holding state.
However, the relay 9 keeps energizing even if the high temperature is detected. Further, when the temperature sensor 1 is energized by the operation switch 6 and the sensor element 8 is in a high temperature state from the beginning, the relay 9 is not energized and is not held by the relay contact 9a.

1a is a sensor first contact constituted by a contact of a relay 9 operated by the temperature sensor 1;
The sensor first contact 1a is attached to the timer count switching portion of the start timer 3, and when the temperature sensor 1 detects a normal low temperature, the start timer 3 switches in 90 seconds, and the temperature sensor 1 re-ignites. When the high temperature is detected by the operation or the like, the switching is performed in 40 seconds, and the combustor is set to start the ignition combustion in a short time.

Reference numeral 1b denotes a sensor second contact constituted by a contact of a relay 9 operated by the temperature sensor 1. When the temperature sensor 1 detects a high temperature, the convection fan 4 is operated at a low speed after the start timer 3 finishes counting.

That is, the convection fan 4 and the convection fan timer 5 each having a high-speed rotation terminal and a low-speed rotation terminal are connected to the circuit of the timer contact 3a that is switched when the counting of the start timer 3 is completed.
When the convection fan timer 5 finishes counting, the convection fan 4 is energized to the high-speed rotation terminal by the fan timer second contact 5b to operate at high speed. When the power is turned off during counting, the sensor second contact 1b is connected between the terminal of the fan timer second contact 5b and the low-speed rotation terminal of the convection fan 4.

For this reason, if the temperature sensor 1 detects a high temperature when the operation switch 6 is closed, the second contact 1b of the temperature sensor 1 supplies electricity to the low-speed terminal of the convection fan 4 and the convection fan timer 5 Until the counting is finished, the weak warm air is blown out from the front of the combustor, so that the hot gas does not stay in the combustor frame and the safety device does not operate. In addition, since the temperature of each part of the combustor is the temperature at the time of normal combustion, there is little generation of incomplete combustion gas, and since it is weak warm air, the odor at the time of ignition does not diffuse into the room and it is comfortable It can be burned.

The embodiment of FIG. 2 is a flowchart for realizing the operation of the circuit of FIG. 1 by a micro computer. When the operation switch 6 is closed, first, the preheater is energized.
Next, the setting time of the start timer 3 and the convection fan timer 5 is set to 90 seconds for the low-temperature start time, the convection fan timer is set to plus 15 seconds (105 seconds), and the temperature sensor 1 is set.
Temperature detection is performed. If the temperature sensor 1 detects a high temperature, the set time of the start timer 3 and the convection fan timer 5 is corrected to 40 seconds for the start time, which is the time for the high temperature start, and to 15 seconds (55 seconds) for the convection fan timer. hand,
After that, the counting of the activation timer 3 is started.

Eventually, when the start-up timer 3 finishes counting, the combustion air supply fan 10 and the fuel supply device 2 are operated to start ignition and combustion, and the temperature detected by the temperature sensor 1 is checked to detect a high temperature. For example, the convection fan 4 is energized by turning on a low-rotation terminal of the convection fan 4 so that the convection fan 4 is rotated at the same time as the combustion air supply fan 10. If the temperature sensor 1 detects a low temperature, the convection fan 4 is stopped. The convection fan timer 5 starts counting.

When the count of the convection fan timer 5 is completed, the high-speed terminal of the convection fan 4 is energized, and further, the energization of the preheating heater 7 serving as an ignition is stopped to start normal combustion.

[Effects of the Invention] As described above, in the present invention, when the combustor is started to operate normally, ignition is performed after a sufficiently long start timer 3 has finished counting, and after the ignition, the convection fan timer 5 continues until the count ends. The convection fan 4 is kept stopped, thereby preventing the disadvantage that the bad smell generated immediately after the ignition is blown into the room together with the warm air similarly to the conventional product.

When the temperature at which the operation of the combustor is started is high, the temperature sensor 1 detects the temperature and shortens the time setting of the start-up timer 3, and the combustor waits for the start of combustion. And the handling performance has been improved. Further, when the combustor starts burning, the amount of heat accumulated in the combustor frame is small, and the convection fan timer 5 keeps the convection fan 4 stopped for a predetermined period of time, thereby preventing the forcible diffusion of the odor. Sometimes, the temperature inside the combustor frame does not become abnormally high.

Further, when the temperature of the combustor is high, not only the convection fan 4 is completely stopped until the set time of the convection fan timer 5 elapses, but also the convection fan 4 is rotated at a low speed to extinguish the fire. Even in the re-operation immediately after, the amount of heat accumulated in the frame body can be blown into the room to prevent the temperature inside the combustor from rising, and the temperature of the hot air blown out by the convection fan 4 can be reduced even immediately after the ignition. There was no trouble of blowing cold air, and the usability was very good.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the invention, and FIG.
The figure is a flowchart for explaining the operation of the device. 1 ... temperature sensor, 2 ... fuel supply, 3 ... start timer 4 ... convection fan, 5 ... convection fan timer, 6 ... operation switch

Claims (2)

(57) [Scope of request for utility model registration] A burner is provided in a frame of a combustor, and a start-up timer is operated based on an ignition operation signal for closing an operation switch, and fuel and combustion air are supplied to the burner by an output signal of the start-up timer. In the combustor provided with the convection fan 4 for initiating combustion and inducing the combustion exhaust gas generated from the burner into the room from the inside of the combustor frame, the temperature of the combustor operated by the closing signal of the operation switch 6 is determined. A temperature sensor 1 to detect, a start timer 3 for variably setting an operation start time of the fuel supply device 2 based on temperature data detected by the temperature sensor 1, and a convection operated by a signal of the start timer 3 for starting combustion of the burner. A convection fan timer 5 for fan control is provided. The convection fan timer 5 operates the convection fan 4 at a high speed after a lapse of a predetermined time from the start of combustion of the burner. A time period from the ignition operation to the start of combustion has a temperature dependency. 2. The combustion according to claim 1, wherein the convection fan, which is stopped by the convection fan timer, energizes a low-speed rotation terminal of the convection fan when the temperature sensor detects a high temperature, and operates the convection fan at low speed. Control device.