JP3679573B2 - Combustion equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a combustion apparatus including a controller that controls a fuel pump that supplies liquid fuel to a burner and an air supply fan that supplies combustion air to the burner.
[0002]
[Prior art]
According to the present invention, a combustion apparatus including a controller that controls a fuel pump that supplies liquid fuel to a burner and an air supply fan that supplies combustion air to the burner is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-93515. Has been.
[0003]
In such a combustion apparatus, since the air density increases as the temperature of the air is lower, some of the combustion apparatuses are corrected to increase the liquid fuel accordingly.
[0004]
[Problems to be solved by the invention]
In the above-described combustion apparatus, the combustion apparatus described above is intended to when the temperature of the combustion air is low was corrected to increase the liquid fuel, not even appear the effect of correction is low temperature portion, in burners Some flames become unstable. When the flame becomes unstable, not only the combustion efficiency is deteriorated but also harmful components are discharged, which is not desirable.
[0005]
The present invention provides a combustion apparatus that can be controlled to obtain a stable combustion state even when the temperature is low.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is a vaporization burner that vaporizes and burns liquid fuel, a fuel pump for supplying liquid fuel to the burner, and combustion in the burner. An air supply fan for supplying air, a fan case containing the air supply fan, a combustion air temperature detector for detecting the temperature of the combustion air sucked into the fan case, an air supply fan, And a control means for controlling the operation of the fuel pump , wherein the control means corrects the amount of fuel supplied to the burner by the fuel pump based on the temperature detected by the combustion air temperature detector. When the temperature detected by the combustion air temperature detector is above a predetermined temperature, the rate of increase in fuel supplied by the fuel pump is reduced, and when the temperature is lower than that, Characterized in that the alters configured to increase the growth rate of the fuel supply by the fuel pump.
[0007]
According to a second aspect of the present invention, in the combustion apparatus according to the first aspect, the predetermined temperature is 0 ° C.
[0008]
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a hot water heating apparatus using a combustion apparatus (heat source machine) 1 according to the present invention. Hot water from a combustion apparatus 1 installed outdoors passes through an outdoor-side piping 2 and an indoor wall 3 It flows to the floor heating panel 8 laid on the indoor floor 7 through the hot water outlet 4, the plug 5 and the indoor-side piping 6, and is radiated here, and then the indoor return piping 9, the plug 5 and the outlet 4. And the combustion device 1, the outdoor-side piping 2, the hot water outlet 3, the plug 4, the indoor-side piping 6, the floor heating panel 8, and the indoor-side return so that it is returned to the combustion device 1 again via the outdoor-side return piping 10 The pipe 9, the plug 5, the hot water outlet 4, and the outdoor side return pipe 10 are connected in a ring shape.
[0010]
In FIG. 2, the combustion apparatus 1 has a box-like casing 21 having a horizontally long rectangular shape in plan view and a substantially square shape in front view. The casing 21 includes a top plate 22, a bottom plate 23, left and right side plates 24, 25, and a back. It consists of a plate 26 (see FIG. 1) and a detachable front panel 27 (see FIG. 1). Inside the casing 21 is an oil burner (burner) 27, an instantaneous heat exchanger 28 connected to the oil burner 27, and a cistern tank 29 for storing hot water heated by the instantaneous heat exchanger 28. A circulating pump 30 for circulating the hot water once stored in the cistern tank 29 to the floor heating panel 8 (external radiator), an oil supply port 31 and an oil amount indicator 32 on the upper surface, and the oil burner 27 A fixed oil tank 34 or the like for storing oil such as kerosene supplied to is stored. In addition, ventilation portions 33 (not shown) for communicating the inside and outside of the casing 21 are provided at appropriate positions at the lower portion of the right side plate 25 of the casing 21 and the upper and lower portions of the back plate 26.
[0011]
The front panel 27 is provided with an opening / closing lid (not shown) in the center portion facing the oil supply port 31 of the oil tank 34, and a viewing window (facing the oil amount indicator 32 adjacent to the opening / closing lid). (Not shown) is provided, and the opening / closing lid is opened so that oil can be supplied from the oil supply port 31 of the oil tank 34.
[0012]
The oil tank 34 is fixedly mounted on the bottom plate 23 of the casing 21 by appropriate fixing means, and the circulation pump 30 is fixedly mounted by appropriate fixing means located beside the oil tank 34. Is placed. The oil tank 34 is set to have an oil storage amount of about 15 to 25 liters. The oil stored in the oil tank 34 is pumped up by a fuel pump 35 such as an electromagnetic pump, and a fuel supply pipe 36. To the oil burner 27.
[0013]
The oil burner 27 is composed of a rotary gasification burner with variable combustion amount that vaporizes and burns kerosene, and the heat generation amount can be varied in the range of about 1,200 to 3,000 kcal / h according to the heat demand of the equipment. It can be done. The instantaneous heat exchanger 28 heated by the oil burner 27 has a base portion connected to a tip portion of the oil burner 27 and an exhaust box 37 at the tip portion. The exhaust gas in 37 is discharged from the exhaust top 39 through the exhaust pipe 38.
[0014]
The connecting structure X between the oil burner 27 and the instantaneous heat exchanger 28 is installed horizontally in the upper space in the casing 21 directly above the oil tank 34, and the connecting structure X installed sideways is: An appropriate place of the oil burner 27 on one end side is fixed and held by a fixing plate device 44 to be described later, and an exhaust box 37 on the other end side is placed on one side upper portion in the casing 21 via a locking fitting (not shown). The support plate 42 is attached and held. A blower 43 supplies combustion air to the oil burner 27, and the blower 43 is connected to the oil burner 27.
[0015]
The fixing plate device 44 has a lower edge portion fixed to a fixing metal fitting 45 mounted on the upper surface of the oil tank 34 by screws or the like, and a rear edge portion fixed to the back plate 26 of the casing 21 by screws or the like. A main fixing plate 41 provided with a front opening notch for inserting the oil burner 27, and an attachment / detachment for screwing the main fixing plate 41 from the front after inserting the oil burner 27 into the notch of the main fixing plate 41. The sub-fixing plate 40 is made possible.
[0016]
45F is a replenishing port cover of the cistern tank 29, 46 is a control box, 47 is a return side connection port, and the warm water after heat radiation is returned from the return side connection port 47 to the combustion device 1 by the floor heating panel 8. The hot water that has flowed to the instantaneous heat exchanger 28 through the pipe 48 and heated there to rise in temperature enters the cis-turn tank 29 through the first outgoing pipe 49, and the hot water in the cis-turn tank 29 is It enters the circulation pump 30 through the outgoing pipe 50, where it is pressurized and flows to the outgoing side connection port 52 through the third outgoing pipe 51.
[0017]
Next, the vicinity of the oil burner 27 will be described in detail. The oil burner 27 includes a bottomed cylindrical burner case 60 and a fan case provided outside the bottom of the burner case 60 as shown in FIG. 61, a vaporizing cylinder 62 accommodated and fixed in the burner case 60, blower fans (air supply fans) 80 and 80 housed in the fan case 61, and a blower fan 80 mounted outside the fan case 61. The fan case 61 is provided with an air inlet 64.
[0018]
The vaporizing cylinder 62 is formed in a bottomed cylindrical shape, a primary air port 69 is provided in the center of the bottom wall, and an electric heater 64 H for vaporization such as a sheathed heater is embedded in the peripheral wall, and the axial direction A flat ceramic burner head 66 having a large number of flame holes 65 and 65 is mounted in the middle portion near the tip, with its center line A being substantially horizontal, upstream of the burner head 66. The inside of the vaporizing cylinder 62 serves as a mixing unit 67 that vaporizes petroleum fuel (for example, kerosene) and mixes the vaporized fuel and primary air from the blower fans 80 and 80 flowing in via the primary air port 63. Yes. Reference numeral 68 denotes a rotary atomization stirring device disposed in the mixing unit 67. The rotary atomization stirring device 68 is rotationally driven by the motor 63 and sprays the fuel supplied from the fuel supply pipe 36 by centrifugal force. And the vaporized fuel and primary air are stirred and mixed.
[0019]
An annular storage chamber 70 is formed between the burner case 60 and the vaporizing cylinder 62, and the ventilation fan 80 is inserted into the storage chamber 70 through vent holes 71, 71 provided on the bottom wall of the burner case 60. , 80 part of the air is sent as secondary air. A ring plate 72 is provided at the downstream end of the air storage chamber 70 between the tip of the vaporizing cylinder 62 and the burner case 60. The ring plate 72, the burner case 60, and the vaporizing cylinder are provided. 62 forms the air storage chamber 70.
[0020]
Further, the ring plate 72 is provided with an inclined surface portion 72A in the vicinity of the vaporizing cylinder 62, and the inclined surface portion 72A is supplied with secondary air to the outer periphery of the flame F formed in front of the burner head 66. The secondary air holes 72A, 72A, 72B, 72B are arranged at substantially equal intervals on the entire circumference, and these secondary air holes 72A, 72B are the sum of the opening areas located above the center line A of the burner head 66. Is set to be larger than the sum of the opening areas located below the center line.
[0021]
In FIG. 3, 73 is a flame detector, 74 is a spark plug, and 75 is a burner temperature detector for detecting the temperature of the vaporizing cylinder 62.
[0022]
Reference numeral 76 denotes a combustion air temperature detector for detecting the temperature of combustion air sucked into the air inlet 64, and reference numeral 77 denotes a controller disposed in the control box 46, which includes a microcomputer. The controller 77 controls the operation of the blower fan 80 and the fuel pump 35, and further performs correction to increase the amount of liquid fuel to be supplied as the detected temperature of the combustion air temperature detector 76 decreases. Since the control to increase the ratio of increasing the supply amount of the liquid fuel supplied to the oil burner 27 when the detected temperature of the combustion air temperature detector 76 is lower than the predetermined temperature (0 ° C.), the controller / control is performed. It can be called a means.
[0023]
In the hot water heating apparatus configured as described above, floor heating is performed by pressing an operation switch of an indoor remote controller (not shown). As shown in FIG. 5, when an operation signal is input, the combustion apparatus first inputs the temperature T of the combustion air temperature detector 76 (ST1), and determines whether this temperature is higher or lower than a predetermined temperature. (ST2). If the temperature is equal to or higher than the predetermined temperature (0 ° C.), the combustion is controlled as the fuel supply amount corresponding to the line A (see FIG. 4) (ST3). However, if the detected temperature is lower than the predetermined temperature (0 ° C.), combustion is performed with the amount of liquid fuel corresponding to line B (see FIG. 4) in which the amount of liquid fuel supplied is greater than that of line A (ST4).
[0024]
The electromagnetic pump as the fuel pump 35 for supplying liquid fuel generally has a sliding portion (the electromagnetic pump of this embodiment). Moreover, what has a rotation part is also considered. In such an electromagnetic pump which becomes a movable part, the movement rapidly deteriorates due to a temperature drop. Further, since the liquid fuel is fed, the viscosity of the liquid fuel is increased due to the temperature drop, and it becomes difficult to feed the liquid fuel. For this reason, in the conventional one, although the fuel supply amount is increased as the temperature is low, the supply amount of liquid fuel is less than the appropriate one (or target amount), and the combustion is not stable. Since the supply of liquid fuel is controlled by the control means so that the liquid fuel becomes appropriate, the ratio of air and liquid fuel is maintained almost proper, combustion is stable and harmful The discharge of various components is also suppressed.
[0025]
[0026]
【The invention's effect】
According to the present invention, a vaporizing burner that vaporizes and burns liquid fuel, a fuel pump for supplying liquid fuel to the burner, an air supply fan for supplying combustion air to the burner, A fan case containing the air supply fan, a combustion air temperature detector for detecting the temperature of the combustion air sucked into the fan case, and a control means for controlling the operation of the air supply fan and the fuel pump. In the combustion apparatus configured to correct the amount of fuel supplied to the burner by the fuel pump based on the temperature detected by the combustion air temperature detector, the control means detects the temperature detected by the combustion air temperature detector. The rate of increase in the fuel supplied by the fuel pump is reduced when the temperature is higher than the predetermined temperature, and the rate of increase in the fuel supplied by the fuel pump is lower than that. Since it is configured so as to increase, the temperature of the combustion air supplied to the burner is supplied by the fuel pump when the temperature is low, for example, lower than 0 ° C., and when the temperature is not as low as 0 ° C. or higher. As a result, the ratio of the amount of combustion air supplied to the burner and the amount of fuel supplied forcibly is optimally maintained in a wide temperature range, and a stable and good combustion state can be maintained. Thus, the combustion performance is further improved.
[0027]
[0028]
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of a hot water heating apparatus using a combustion apparatus of the present invention.
FIG. 2 is a front view showing a state where a front panel of the combustion apparatus is removed.
FIG. 3 is a block diagram showing a schematic configuration of a control circuit of the combustion apparatus.
FIG. 4 is a flowchart showing the operation of the combustion apparatus.
FIG. 5 is a diagram showing a relationship between a detected temperature and a fuel supply amount in the combustion apparatus.
[Explanation of symbols]
1 Combustor 27 Oil burner ( vaporizing burner)
35 Fuel pump
61 Fan case 77 Control means 76 Combustion air temperature detector 80 Blower fan (supply fan)

Claims (2)

Accommodates a vaporizing burner that vaporizes and burns liquid fuel, a fuel pump for supplying liquid fuel to the burner, a supply fan for supplying combustion air to the burner, and the supply fan A combustion air temperature detector for detecting the temperature of the combustion air sucked into the fan case, and a control means for controlling the operation of the air supply fan and the fuel pump. In the combustion apparatus adapted to correct the amount of fuel supplied to the burner by the fuel pump based on the detected temperature of the combustor,
The control means reduces the rate of increase of fuel supplied by the fuel pump when the temperature detected by the combustion air temperature detector is above a predetermined temperature, and when the temperature is lower than that, the fuel pump The combustion apparatus is characterized in that it is configured to change so as to increase the rate of increase in the fuel supplied by the engine. The combustion apparatus according to claim 1, wherein the predetermined temperature is 0 ° C.

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