JPS6318082B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a combustion device equipped with two or more gasification burners that gasify and burn oil fuel such as kerosene, and in particular, relates to a combustion device that is equipped with two or more gasification burners that gasify and burn oil fuel such as kerosene. This invention relates to measures to reduce the power supply capacity and shorten the preheating time.

(Prior Art) A conventional gasification combustion type combustion device includes a motor, a diffusion vane driven by the motor to diffuse oil fuel, and a vaporizer that vaporizes the oil fuel centrifugally diffused by the diffusion vane. a combustion air fan that is driven by the motor and sucks combustion air; a flame port that mixes and burns the oil fuel vaporized by the vaporizer with the air sucked by the combustion air fan; and an outer periphery of the vaporizer. A so-called gasification burner equipped with a preheating electric heater for heating the vaporizer is installed in the combustion chamber, and the rotational speed of the motor that drives the combustion air fan and the supply amount of oil fuel are controlled. By controlling the amount of combustion, the capacity was controlled.

However, in the conventional type, when the combustion amount of the gasification burner increases to a certain extent, the load on the flame port becomes correspondingly large, so if the combustion amount is reduced to control the capacity of such a burner, the load on the gasification burner increases. It is small, and the distribution of the load on the flame opening becomes uneven, causing problems such as back combustion and unstable combustion.Furthermore, it is necessary to reduce the motor rotation speed because the amount of combustion air needs to correspond to the amount of combustion. Due to insufficient centrifugal diffusion of oil fuel, resulting in poor combustion, the control range of capacity control was limited to at most 60 to 65% of the rated capacity.

On the other hand, at the start of operation, if the temperature of the vaporizer is too low, the oil fuel cannot be vaporized, and if it is too high, tar and other substances will adhere to the vaporizer. Conventionally, the vaporizer is heated to a predetermined preheating completion temperature.

(Problems to be Solved by the Invention) Therefore, in order to expand the combustion capacity control range, two or more gasification burners as described above are arranged side by side with the flame ports of each burner facing one combustion chamber, Turn on and off the motor of at least one of these burners
It is conceivable that by controlling the combustion capacity and controlling the capacity, it is possible to control the combustion capacity by at least 100-50%.

However, in this case, if the preheating electric heaters of each burner are operated simultaneously to preheat each vaporizer at the start of operation, there is a problem that the power supply capacity for these electric heaters becomes large. Furthermore, if the operation of each preheating electric heater is relay-controlled so that the vaporizer of each burner is sequentially preheated in order to reduce the power supply capacity, the overall preheating time tends to become unnecessarily long.

The present invention has been made in view of these points, and includes two gasification burners as described above in one combustion chamber.
Based on this premise, by preheating the vaporizers of each burner in sequence as described above, the capacity of the power supply for the electric heater can be reduced, and the gas By reflecting the radiant heat from the flame port of one burner during oxidative combustion to the flame port of other burners, the preheating time using the electric heater when starting the other burners is shortened, and the overall preheating time is shortened. The purpose is to reduce the power consumption associated with this.

(Means for solving the problem) In order to achieve this object, the solving means taken by the present invention is as shown in FIGS.
, a diffusion vane 12 driven by the motor 7 to diffuse oil fuel, a vaporizer 13 to vaporize the oil fuel centrifugally diffused by the diffusion vane 12, and a combustion air driven by the motor 7 to suck in combustion air. a combustion air fan 15 , a flame port 17 that mixes the oil fuel vaporized by the vaporizer 13 with the air sucked in by the combustion air fan 15 and burns it; A gasification burner 6 equipped with a preheating electric heater 18 for heating the
1 or more flame ports 1 for each burner 6 in one combustion chamber 5
7 are arranged side by side facing each other, the temperature detecting means Tc ₁ , Tc ₂ detecting the temperature of the vaporizer 13 of each of the burners 6 , and the respective temperature detecting means Tc ₁ ,
In response to the output of Tc ₂ , at the start of operation, the vaporizer 13 of each burner 6 is heated to a predetermined preheating completion temperature, and then gasification combustion is started. A control means 25 for controlling the operation of the electric heaters 18 and motors 7 is disposed downstream of the flame port 17 of each burner 6 of the combustion chamber 5, and is arranged to transfer radiant heat from one flame port 17 to the other flames. Mouth 1
7 and a heat-reflecting baffle plate 19.

(Function) As a result, in the present invention, the electric heaters 18... The power supply capacity for one electric heater 18 is sufficient, resulting in a small capacity.

Furthermore, when one burner 6 performs gasification combustion after the completion of preheating of its vaporizer 13, the radiant heat from the flame from the flame port 17 of that burner 6 is radiated by the buffer plate 19 to the flame port 17 of the other burner 6, and the flame Since the vaporizer 13 is heated through the port 17, the preheating time using the preheating electric heater 18 is short when starting other burners 6, and the overall preheating time can be shortened.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to a hot-air heater. Reference numeral 1 indicates a main body casing, and a suction port 2 is provided at the lower rear of the main casing 1, and an inlet 2 is provided at the upper front and central portion of the main casing. Air outlets 3, 3 are provided, respectively. In addition, a convection fan 4 is disposed in the lower part of the main body casing 1, and one combustion chamber 5 is disposed above (downstream) of the convection fan 4. It is configured to mix air with combustion gas from the combustion chamber 5 and blow out warm air into the room from the blow-off ports 3, 3.

In the combustion chamber 5, there are two
The base gasification burners 6, 6 are arranged in parallel. As shown in FIG. 3, each gasification burner 6 includes a double-shaft motor 7, a diffusion vane 12 that is driven by the motor 7 and diffuses the oil fuel, and one end (lower end) of the rotating shaft 8 of the motor 7. ) is connected to and driven by an oil pump 9 for oil feeding, and the oil pump 9 discharges and supplies oil to the other end (upper end) of the rotary shaft 8 via an oil supply passage 10 formed in the rotary shaft 8. a vaporizer 13 that vaporizes the oil fuel that has been centrifugally diffused by the diffusion plate 11 and the diffusion vanes 12; A combustion air fan 15, a flame port 17 for mixing oil fuel vaporized by the vaporizer 13 with combustion air taken in by the fan 15, and igniting and burning the mixture by an electrode rod 16; It is equipped with a preheating electric heater 18 disposed to heat the vaporizer 13 and promote vaporization, and the flame ports 17, 17 of each gasification burner 6, 6 are made to face the combustion chamber 5. There is. However, the above 2
One motor 7 in the main gasification burner 6,6
By controlling ON-OFF, both motors 7,
7 turns on and both burners 6 and 6 operate 100
It is configured to perform capacity control in a control range from % capacity to 50% capacity, where one of both motors 7, 7 is turned off and one burner 6 is stopped.

Furthermore, the flame ports 1 of both the gasification burners 6, 6
At the upper side of the downstream side of 7 and 17, there is a pyramid-shaped heat-reflecting buttful plate 19 having an opening 19a in the center.
is arranged and is configured to reflect the radiant heat from one burner port 17 to the other burner port 17.

Moreover, the central opening 19a of the baffle plate 19
A downward inverted box-shaped dispersion baffle plate 20 for dispersing combustion gas to the peripheral wall 5a of the combustion chamber 5 is disposed above, and an opening 5c is provided in the center of the top plate portion 5b of the combustion chamber 5. A downward inverted box-shaped diffusion plate 21 having a size smaller than the peripheral wall 5a of the combustion chamber 5 is disposed above the opening 5c with an appropriate gap g, and diffuses the combustion gas. It is configured so that it is evenly dispersed and flows out around the combustion chamber 5 and mixed well with convection air. An exhaust connecting pipe 22 is attached to the center of the diffusion plate 21, and the exhaust connecting pipe 22 extends to the vicinity of the top plate portion 1a of the main body casing 1, and is not connected to the top when the exhaust pipe 23 is not connected. It is closed by a blind plate 24 provided on the plate portion 1a.

In addition, the preheating electric heaters 18, 18 of each of the gasification burners 6 are turned on at the time of starting operation at 100% capacity, and after preheating is completed, turned off, the other electric heater 18 is turned on. is configured to preheat by turning ON. That is, the control circuit 25 shown in FIG.
Temperature switches Tc ₁ and Tc ₂ act as temperature detection means that detect the temperature of the vaporizers 13, 13 of each burner 6, 6 and turn on when a predetermined preheating completion temperature is reached, and turn off when the indoor temperature reaches the set temperature. A temperature controller Tc ₃ for controlling the operating capacity and a relay coil excited by the ON operation of the temperature controller Tc ₃
MRc ₃ , the relay coil MRc ₁ which is excited by the ON operation of the temperature switch Tc ₁ , and the ON operation of the temperature switch Tc ₂ and the relay coil MRc _3.
Relay coil MRc ₂ is energized by closing relay contact MRs ₃ due to excitation of
Relay contact MRs ₁ by excitation of MRc ₁ and MRc ₂ ,
Double-shaft motors 7 and 7, (M ₁ and M ₂ ) activated by closing MRs ₂ and timers TM ₁ and
TM ₂ , a normally closed contact TM _1-1 that opens after a predetermined time has elapsed due to the operation of the timer TM ₁ , and a normally open contact TM _1-2 that closes after a predetermined time has elapsed due to the operation of the timer TM ₂ . Normally closed contact
TM _2-1 , one preheating electric heater 18, (H ₁ ) that operates when the normally closed contact TM _1-1 is closed, the normally open contact TM _1-2 and the normally closed contact TM _2-1. and the other preheating electric heater 18, _H2 that operates when the normally open contact MRs ₃ of the relay coil MRc ₃ is closed;
At the start of operation, first, only one preheating electric heater _H1 is activated, and then only the other preheating electric heater _H2 is activated, that is, the vaporizer 13 of each burner 6 is activated. The control means is configured to control the preheating electric heater 18 and motor 7 of each burner 6 so as to sequentially raise the temperature to a predetermined preheating completion temperature and then start gasification combustion.

In FIG. 1, reference numeral 26 denotes an overheat prevention thermostat that stops the operation of the motors 7, 7 in the event of abnormal overheating to prevent overheating. In FIG. 2, 27 is a control board provided at the lower front of the main casing 1. In FIG. 3, 28 is a temperature switch for detecting the temperature of the vaporizer 13, which corresponds to Tc ₁ and Tc ₂ in FIG. 4.

Next, the operation of the above embodiment will be explained.
Two rotary gasification burners 6 in which a motor 7 drives both diffusion vanes 12 for diffusing oil fuel and a combustion air fan 15 are installed in one combustion chamber 5, which means combustion at 1/2 of the maximum capacity. Since two burners 6 are provided and capacity control is performed by controlling ON/OFF of the motor 7 of one burner 6, the combustion capacity control range can be set to 100% to 50%. This makes it possible to control the capacity to suit the external load, and to provide comfortable heating with less temperature unevenness.

In this case, at the start of operation, the vaporizer 13 of each burner 6 is heated to a predetermined preheating completion temperature and then gasification combustion is started, so that the power supply capacity for the preheating electric heater 18 is reduced. 1
The capacity for one electric heater 18 is sufficient, and the capacity can be reduced.

Moreover, the flame ports 17, 1 of both gasification burners 6, 6
By arranging the heat reflecting baffle plate 19 on the downstream side of the burner 7, the radiant heat from the flame of one burner 6, which is gasified and burned after completion of preheating, is radiated to the other burner 6 and heated. 6, the preheating time by the preheating electric heater 18 can be shortened, and power consumption can be reduced. Furthermore, if the baffle plate 19 is formed into a pyramidal shape such as a pyramid having an opening 19a in the center, the combustion gas from one burner 6 and the combustion gas from the other burner 6 can be
Since the unused gas at the time of turning on and off of the burner 6 is guided by the baffle plate 19 and merges with it, the unused gas can be completely after-burned, and the odor caused by turning on and off of the burner 6 can be reliably removed.

Incidentally, in the above embodiment, the heat reflecting baffle plate 19
The shape is pyramidal with an opening 19a in the center, but other shapes such as a conical shape, a mountain shape, etc.
Any shape is acceptable as long as it reflects the radiant heat from one burner 6 to the other burner port 17, but if it is a conical shape with an opening in the center as in the above embodiment, the combustion gas from one burner 6 and the other burner 6 This is advantageous because it is possible to completely after-burn the unused gas by merging the unused gases, and the odor can be reliably removed.

Further, in the above embodiment, two gasification burners 6 are installed in one combustion chamber 5 in parallel, but three or more gasification burners 6 may be installed in parallel, and in this case, the capacity control is performed sequentially except for one.
It performs ON-OFF control. Further, in the above embodiment, the double-shaft motor 7 is used to drive the oil pump 9 for oil supply, but it is also possible to use a separate motor, an electromagnetic pump, or an oil volume regulator to drive the oil pump 9. It may also be a formula.

Further, in the above embodiments, the present invention was applied to a hot air heater, but it goes without saying that the present invention can be applied to hot water boilers, steam boilers, dryers, etc.

(Effects of the Invention) As described above, according to the present invention, in a combustion apparatus in which two or more gasification burners are arranged in parallel in one combustion chamber in order to expand the combustion capacity control range, each burner is After raising the temperature of the vaporizer to a predetermined preheating completion temperature, gasification and combustion are started in sequence, and after completion of preheating, the radiant heat from the flame port of one burner that performs gasification and combustion is transferred to the other burners using a double plate. Since the heat is reflected from the flame opening, the power supply capacity for the preheating electric heater can be reduced, and the overall preheating time can be shortened, reducing power consumption. It is.

In addition, if the baffle plate has a conical shape with an opening in the center, it has the advantage that odors caused by turning on and off the burner can be completely eliminated.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front sectional view showing the overall schematic configuration, Fig. 2 is a side sectional view of the same, Fig. 3 is an enlarged sectional view of the gasification burner, and Fig. 4 is a control circuit. FIG. 5... Combustion chamber, 6... Gasification burner, 7... Motor, 12... Diffusion vane, 13... Carburizer, 15
...Combustion air fan, 17...flame mouth, 18...
Electric heater for preheating, 19...Full plate, 19a
...opening, Tc ₁ , Tc ₂ ... temperature switch (temperature detection means), 25 ... control circuit (control means).

Claims (1)

[Claims] 1. A motor 7, a diffusion vane 12 that is driven by the motor 7 and diffuses oil fuel, and a vaporizer 13 that vaporizes the oil fuel centrifugally diffused by the diffusion vane 12.
, a combustion air fan 15 that is driven by the motor 7 and sucks combustion air, and a flame port 17 that mixes the oil fuel vaporized by the vaporizer 13 with the air sucked by the combustion air fan 15 and burns the mixture.
and a vaporizer 13 disposed around the outer periphery of the vaporizer 13.
A combustion device in which two or more gasification burners 6 each equipped with a preheating electric heater 18 for heating are arranged side by side with the flame ports 17 of each burner 6 facing into one combustion chamber 5, Temperature detecting means Tc ₁ , Tc ₂ detect the temperature of the vaporizer 13 of the burner 6 ..., and the vaporizer 13 of each burner 6 receives the output of the temperature detecting means Tc ₁ , Tc ₂ at the start of operation. a control means 25 for controlling the operation of the preheating electric heater 18 and motor 7 of each burner 6 so as to sequentially start gasification combustion after raising the temperature to a predetermined preheating completion temperature; Combustion characterized by comprising a baffle plate 19 disposed on the downstream side of the burner port 17 of each burner 6 in the chamber 5 to reflect radiant heat from one burner port 17 to another burner port 17. Device. 2. The combustion device according to claim 1, wherein the baffle plate 19 has a conical shape with an opening 19a in the center.