JPH0571664U - Evaporative combustion equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the generation of fire transfer noise from the sub-burner to the main burner in vaporization type combustion equipment. [Structure] A main burner 7 for intermittent combustion and a sub-burner 8 for continuous combustion are arranged side by side so that the fire can be transferred. Each burner 7, 8
The nozzles 16 and 12 corresponding to are connected to the vaporizer 4. Combustion of the sub-burner 8 executes weak combustion, and combustion of both burners 7, 8 executes strong combustion. At the start of strong combustion, the amount of combustion increases in the weak combustion state, and when there is a fire transfer signal, the amount of combustion decreases, and when 3 seconds have elapsed, the solenoid 15 on the main burner 7 side
Is activated to open the nozzle 12 and supply vaporized gas to the main burner 7 to enable a fire transfer. The occurrence of the fire transfer noise is suppressed by increasing the combustion amount and executing the strong combustion when 6 seconds have elapsed from the start of the input of the fire transfer signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vaporization type combustion device that supplies liquid fuel to a vaporizer, vaporizes the liquid fuel by the vaporizer, and supplies the vaporized gas to a burner through a nozzle to burn the vaporized fuel.

[0002]

[Prior Art]

 In conventional vaporization type combustion equipment, a nozzle is provided in communication with the end of a vaporizer having a vaporization heater, and the electromagnetic pump is driven after the vaporization heater preheats the vaporizer and reaches a prescribed vaporizable temperature. Then, the liquid fuel in the fuel reservoir is sequentially supplied to the vaporizer, and the supplied liquid fuel is vaporized by the heat of the vaporization heater, and the vaporized gas is guided from the nozzle to the burner together with the combustion air for combustion. The combustion amount of the burner was increased / decreased by adjusting the drive frequency of the electromagnetic pump to adjust the amount of liquid fuel sent from the electromagnetic pump.

[0003]

[Problems to be solved by the device]

 In the above conventional technique, the amount of liquid fuel to be supplied is adjusted to adjust the combustion amount. However, when the combustion amount is extremely reduced, the ejection speed of vaporized gas from the nozzle decreases and the burner flame nozzle part In this case, the fuel supply does not follow the combustion speed, and a so-called flashback phenomenon occurs. As described above, in the conventional technique, there is a limit to the reduction of the combustion amount, so that there is a problem that the room becomes too hot even with the minimum combustion amount when the temperature is relatively warm such as in the early spring.

As one means for solving such a problem, a pair of nozzles are connected to the carburetor, burners are provided corresponding to these nozzles, respectively, and the burner flame tip is inclined toward the inside to burn. It is proposed that the burner be provided so that it can be moved, and that the combustion of both burners will result in a strong combustion, and the combustion of either one of the burners will result in a weak combustion, and that the combustion amount will be greatly adjusted, as shown in Fig. 7. In the weak combustion state with one burner, the combustion stage is changed to P1 (600 kcal / h) → P2 → P3 → P4 → P5 (1400 kcal / h) → P6 → P7 (1500 kcal / h), and the sequential combustion amount Is increased to P8 (2000 kcal / h) by the start of strong combustion due to the transfer of fire to another burner, and then the amount of combustion is increased to P9 ··· in the strong combustion state and conversely the amount of combustion is decreased. When doing 8 After shifting from P9 to P8, the other burner is extinguished to shift to P7 ', which has a smaller combustion amount than P7, and then to P6', which has a smaller combustion amount than P6, and then shifts the combustion stage to P5 to P1. With hysteresis, the frequency of switching between strong and weak is reduced. In such a combustion device, when the combustion flame of the burning burner is transferred to the other burner at the start of strong combustion, that is, in the weak combustion state, and the combustion is performed strongly, the amount of combustion is large in the weak combustion state. The fire transfer operation is executed in the state of the combustion stage P7 in FIG. This fire transfer action energizes the solenoid to open the nozzle corresponding to the other burner, and at the same time increases the combustion amount to the combustion stage P8, so the nozzle opening area is approximately doubled. When the internal pressure of the carburetor temporarily dropped, the increased vaporized gas was supplied to the burner. As a result, as shown in Fig. 8, the mechanical noise of nozzle opening operation was changed from the combustion noise of combustion stage P7. There was a concern that the fire transfer noise indicated by the arrow A would be generated as a noise which is relatively higher than that in the combustion stage P7 immediately after standing up.

An object of the present invention is to solve the above problems and to provide a vaporization type combustion device that expands the variable range of thermal power and suppresses the generation of a fire transfer noise at the start of strong combustion.

[0006]

[Means for Solving the Problems]

 In the present invention, a main burner 7 for intermittent combustion and a sub-burner 8 for continuous combustion are installed side by side so that they can transfer fire, and a nozzle 12 corresponding to the main burner 7 and a nozzle 16 corresponding to the sub-burner 8 are vaporized. Just before the fire transfer operation from the sub-burner 8 to the main burner 7, a control means 32 for reducing the liquid fuel supply amount from the fuel supply amount at this time and increasing it after the fire transfer operation is provided. It is a thing.

[0007]

With the above configuration, when the combustion flame of the sub-burner 8 is transferred to the main burner 7 at the start of strong combustion, the combustion amount is reduced immediately before the transfer operation, and the combustion is continued while the throttled combustion state continues. The fire transfer noise is reduced by performing the transfer operation.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention, in which 1 is a liquid fuel reservoir, to which an electromagnetic pump 2 is fixed. Is connected to a carburetor 4 via an oil feed pipe 3. This vaporizer 4 is provided with a vaporization heater 5 such as a sheath heater on a cylindrical aluminum die cast or brass substrate 4A and a thermistor 6 for detecting the vaporizable temperature. The carburetor 4 is provided orthogonally to the burners 7 and 8 on one side between a pair of intermittent combustion main burners 7 and continuous combustion sub-burners 8 which are provided in parallel at intervals. The burner flame mouths 9 and 10 provided in the pair of burners 7 and 8 are provided so as to incline toward each other so as to be slightly inwardly upward, and further, between the burners 7 and 8. Above the upper part of the base body 4A of the vaporizer 4, a flat plate-shaped heat recovery body 11 made of a material having good heat conduction such as aluminum or brass is erected upright, and the upper part of the heat recovery body 11 is provided on both sides. The burner flame openings 9 and 10 are provided slightly above.

Reference numeral 12 denotes a nozzle on the side of the main burner 7, and this nozzle 12 is provided substantially in the center of the upper portion of the base body 4A of the vaporization chamber 4B formed in the vaporizer 4 and orthogonal to the vaporizer 4. A jet port 13 is provided at its tip. Reference numeral 14 is a needle shaft that is provided so as to be able to move back and forth in the nozzle 12 when the solenoid 15 is disconnected. Reference numeral 16 denotes a nozzle on the side of the sub-burner 8 having an ejection port 17 at the tip, and this nozzle 16 is provided above the base body 4A on the tip 18 side of the vaporization chamber 4B, orthogonal to the vaporization chamber 4B, and connected to the solenoid 19. A needle shaft 20 is provided that moves forward and backward by disconnecting electricity. A return port 21 is provided on the opposite side of the nozzle 16, and a fuel return passage 21A connected to the liquid fuel storage portion 1 is connected to the return port 21. During combustion, the jet port 17 is opened to return the fuel. The mouth 21 is closed, and the jet 17 is closed to extinguish the return port 21 during extinguishing the fire. The other end of the first communication passage 22 having one end connected to the tip 18 of the vaporization chamber 4B is connected to the nozzle 16 on the sub-burner 8 side, and the second communication end having the one end connected to the nozzle 16 is further connected. The other end of the passage 23 is connected to the nozzle 12 on the main burner 7 side, and these nozzles 12 and 16 are constantly connected in series with the vaporization chamber 4B via the first and second communication passages 22 and 23. .. Reference numeral 24 denotes a burner throat portion of the main burner 7. The opening 25 of the burner throat portion 24 is opposed to the jet outlet 13 with a space therebetween, and the primary gas for combustion is generated by the vaporized gas jetted from the jet outlet 13. It is sucked, mixed with each other, and burned at the burner flame mouth portion 9 of the main burner 7. Reference numeral 26 denotes a burner throat portion of the sub-burner 8. The opening 27 of the burner throat portion 26 is opposed to the jet outlet 17 at a distance from the jet outlet 17, and the vaporized gas and the primary air are mixed and burned at the burner flame nozzle 10. An ignition heater 28 and a flame sensor 29 are provided near the burner flame port 10. The opening area of the jet port 13 on the side of the main burner 7 is larger than the opening area of the jet port 17 on the side of the sub-burner 8, and the opening areas of the burner flame port 9 and the burner throat part 24 on the side of the main burner 7 are the above. The burner amount of the main burner 7 can be made larger than that of the sub-burner 8 by making it larger than the opening area of the burner flame port 10 and the burner throat part 26 on the sub-burner 8 side. The burner flame mouth portion 9 of the main burner 7 is provided in a range where the flame can be transferred from the flame mouth portion 10.

FIG. 4 is a circuit diagram showing the electrical configuration of the vaporization type combustion instrument. An ignition heater 28, a vaporization heater 5 and a triac 30 for changing the energization cycle of the vaporization heater 5 are connected in series to an AC power source E. ing. In this case, the voltage distribution of the ignition heater 28 is about 5V. A series circuit of a capacitor C and a resistor R1 is connected in parallel to the triac 30, and a phototriac 31A of a photocoupler 31 is connected between the terminal and the gate of the triac 30 via a resistor R2. Reference numeral 32 is a control circuit composed of a micro computer as a control means, which inputs various information from the thermistor 6, the frame sensor 29, the operation switch 33, etc. to control the load, and the operation switch 33 and the switch 34 are closed. Then, the triac 30 is ignited by the signal from the control circuit 32 via the light emitting diode 31B and the phototraic 31A, and the vaporization heater 5 is energized in the energization cycle controlled by this ignition. When the thermistor 6 detects that the vaporizer 4 has reached the vaporizable temperature of the liquid fuel, it excites the relay 35 to open the normally closed relay contact 35A for short circuit which is connected in parallel to the ignition heater 28. When the ignition heater 28 is energized, the relay 36 is excited to close the normally open relay contact 36A, the solenoid 19 on the subburner 8 side is energized via the rectifier circuit 37, and the electromagnetic pump 2 is also activated. When the flame sensor 29 detects ignition of the sub-burner 8, the relay 38 is excited to close the normally open relay contact 38A, and the convection blower fan motor 39 is rotated. In addition, the relay 40 is excited by the fire transfer signal to close the normally open relay contact 40A, and the solenoid 15 on the main burner 7 side is energized via the rectifier circuit 37A to generate the combustion flame F of the sub burner 8. The flame is transferred to the main burner 7 and strong combustion starts.

When there is a fire transfer signal in the combustion stable state, the control circuit 32 first reduces the fuel supply amount to the carburetor 4 by the electromagnetic pump 2, and in this state, energizes the solenoid 15 to vaporize the main burner 7. The gas is supplied and then the fuel supply is controlled to increase.

Next, the operation of the above configuration will be described.

First, when the operation switch 33 is turned on to start the operation, the vaporization heater 5 is energized to start heating the vaporizer 4. Then, the temperature of the vaporizer 4 is detected by the thermistor 6, and when it is detected that the vaporizer 4 has reached a predetermined vaporizable temperature of the liquid fuel (not shown), the sub-burner 8 is ignited. When the sub-burner 8 is ignited, the electromagnetic pump 2 and the solenoid 19 on the side of the sub-burner 8 are activated and the ignition heater 28 is energized. Then, the liquid fuel is sucked by the electromagnetic pump 2 and supplied to the vaporizer 4, the liquid fuel is heated and vaporized in the vaporizer 4, and the vaporized gas passes through the first communication passage 22 as shown by the arrow in FIG. It is supplied to the nozzle 16 on the sub-burner 8 side, and further reaches the nozzle 12 on the main burner 7 side through the second communication path 23. Then, the vaporized gas passes through the nozzle 16 in which the needle shaft 20 on the sub-burner 8 side is retracted by the solenoid 19 and is ejected from the ejection port 17 to the burner throat portion 26. At the same time, the combustion air is drawn into the burner throat section 26 by the momentum of this vaporized gas, and the mixed gas mixed with this combustion air is blown out from the burner flame tip section 10 of the sub-burner 8 and is ignited by the ignition heater 28. Then, combustion is started in the sub-burner 8. Next, when the flame sensor 29 detects that ignition is stable, the ignition heater 28 is turned off and the convection fan motor is rotated. At this time, since the fire transfer signal is output from the control circuit 32 so that the room temperature is low and the combustion state is strong combustion, the fire transfer operation to the main burner 7 is started. This is because the operation of the solenoid 15 on the main burner 7 side causes the needle shaft 14 to retreat and the nozzle 12 to open, and the mixed gas in the carburetor 4 is ejected from the ejection port 13 by the opening of the nozzle 12 to burner flame. The mixed gas ejected from the mouth 9 stays in the vicinity of the burner flame mouth 9 and the combustion flame F of the sub-burner 8 is transferred to the main burner 7 to start combustion and start a strong combustion state. By adjusting the amount of liquid fuel sent from the electromagnetic pump 2, the amount of combustion by the burners 7 and 8 can be adjusted in a strong combustion state.

Next, when the room temperature rises and this is detected by a room temperature sensor (not shown) or set to weak combustion, the control circuit 32 changes the combustion state to a value equal to or less than the minimum combustion amount in the strong combustion state. The relay contact 40A is opened, the solenoid 15 is cut off, the needle shaft 14 on the main burner 7 side closes the ejection port 13, and the ejection of vaporized gas from the ejection port 13 is stopped. The main burner 7 is extinguished. Therefore, the combustion state of only the sub-burner 8 continues and becomes a weak combustion state. Then, by adjusting the amount of liquid fuel sent by the electromagnetic pump 2, it is possible to adjust the combustion amount of the sub-burner 8 in a weak combustion state. When the sub-burner 8 is transferred to the main burner 7 during the transition from the weak combustion state to the strong combustion state, the fuel supply amount is first reduced, and the solenoid 15 on the main burner 7 side is energized in this state. Then, the fire is transferred, and then the fuel supply amount is increased. Also, when the operation switch 33 is extinguished during weak combustion, the jet 17 on the sub-burner 8 side is closed to put it into a fire extinguishing state, and at the same time, the fuel return port 21 is opened and the fuel in the carburetor 4 is replaced by the fuel return passage 21A. It reaches the liquid fuel storage section 1 via the.

Next, the operation from weak combustion to strong combustion in the normal combustion state will be described with reference to FIGS. 5 and 6.

First, in the weak combustion state, the combustion stage is sequentially shifted to P1 to P6 shown in FIG. 7 (step 1), and in step 2, the combustion stage is shifted to P7. Next, in step 3, it is judged whether or not there is a fire transfer signal. When there is a fire transfer signal, the process proceeds to step 4 and the fuel supply amount is reduced by the control of the electromagnetic pump 2 to 600 kcal / h in the combustion stage P1. The amount of combustion is reduced, and this state is continued. At step 5, the time count is started. After that, when it is judged at step 6 that 3 seconds have elapsed, the solenoid 15 of the main burner 7 is operated to turn on the nozzle 12. The fire transfer operation is executed by opening (step 7). Further, when it is judged in step 8 that the P1 combustion stage has continued for 6 seconds, the combustion supply amount is increased in step 9 to start strong combustion at the combustion amount of 2000 kcal / h in the combustion stage P8, and step 10 Controls the strong combustion state. As a result, the flame transfer is performed in a state of a small combustion amount in the weak combustion state, so that even if the internal pressure of the carburetor 4 is temporarily reduced by opening the nozzle 12 on the main burner 7 side, The amount of vaporized gas supplied to No. 8 becomes small, and as a result, as shown in FIG. 6, after the mechanical noise of the nozzle opening operation rises from the combustion noise of the burning stage P1, the abnormal noise as shown in A of FIG. The burning noise is maintained at the combustion level of P7 level without generating a burning noise, and no unpleasant noise is generated.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the combustion abilities of the main burner and the sub-burner may be about the same, and the duration of the combustion amount reduction control executed before and after the fire transfer operation and the combustion amount reduction degree can be appropriately selected.

[0019]

[Effect of the device]

 In the present invention, a main burner for intermittent combustion and a sub-burner for continuous combustion are installed side by side so as to be capable of transferring fire, and a nozzle corresponding to the main burner and a nozzle corresponding to the sub-burner are connected to the vaporizer, and Immediately before the fire transfer operation from the sub-burner to the main burner, a control means for decreasing the liquid fuel supply amount from the fuel supply amount at this time and increasing it after the fire transfer operation is provided to expand the variable range of thermal power and It is possible to provide a vaporization-type combustion instrument that suppresses the generation of a flame transfer sound at the start of strong combustion.

[Brief description of drawings]

FIG. 1 is a perspective view showing a relationship among a main burner, a sub-burner, a nozzle and a carburetor according to an embodiment of the present invention.

2 is a partially cutaway plan view of FIG. 1. FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a circuit diagram showing an electrical configuration of a vaporization type combustion instrument.

FIG. 5 is a flowchart showing fire transfer control.

FIG. 6 is a graph showing noise characteristics during a fire transfer.

FIG. 7 is a schematic explanatory diagram showing switching control between weak and strong combustion.

FIG. 8 is a graph showing noise characteristics when a fire is transferred in a conventional vaporization type combustion device.

[Explanation of symbols]

 4 vaporizer 7 main burner 8 sub-burner 12, 16 nozzle 32 control circuit (control means)

Claims (1)

[Scope of utility model registration request] 1. A vaporization-type combustion apparatus for supplying liquid fuel to a vaporizer, vaporizing the liquid fuel by the vaporizer, and supplying the vaporized gas to a burner through a nozzle to burn the vaporized combustor. A burner and a sub-burner for continuous combustion are arranged side by side so that they can transfer fire, and a nozzle corresponding to the main burner and a nozzle corresponding to the sub-burner are connected to the vaporizer, and the transfer of fire from the sub-burner to the main burner is performed. A vaporization type combustion instrument characterized by comprising control means for decreasing the supply amount of the liquid fuel from the fuel supply amount at this point immediately before the operation and increasing it after the fire transfer operation.