JP3832049B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a combustion apparatus such as a water heater or a heater used at home.
[0002]
[Prior art]
  Conventional combustion apparatuses of this type are generally those described in JP-A-8-21606. As shown in FIG. 23, this combustion apparatus includes a pump 1 for supplying liquid fuel, a carburetor 5 in which an electric heater 4 is ejected from a nozzle 3 through which the liquid fuel passes through an oil feed pipe 2, and for combustion. A blower fan 6 for sending out air, a primary air passage 8 provided in the blower passage 7 for introducing the combustion air into the carburetor 5, and a combustible mixture mixed with fuel vaporized in the carburetor 5 A mixing chamber 9 for uniformly mixing the air, a flame port 11 provided above the mixing chamber 9 and constituting the burner head 10, a secondary air passage 12 provided in the vicinity of the flame port 11, and this The cross-sectional area of the air passage 7 is changed by opening and closing the secondary air port 13 provided at the upper part of the secondary air passage 12 and the entrance of the primary air passage 8, and the primary air passage 8 is substantially closed when closed. Air amount adjusting means 14 provided for It had been constructed by. Reference numeral 15 denotes a blue flame formed on the flame outlet 11.
[0003]
  The liquid fuel supplied from the pump 1 passes through the oil feed pipe 2 and is sent out as droplets from the nozzle 3 to the vaporizer 5 in which the electric heater 4 is embedded, and is heated and vaporized. On the other hand, the combustion air passes through the blower passage 7 by the blower fan 6, and a part thereof is introduced into the carburetor 5 from the primary air passage 8 and mixed with the vaporized fuel to become a combustible mixture. After being uniformly mixed, a blue flame 15 is formed at the flame port 11 constituting the burner head 10 and burned.
[0004]
  On the other hand, the remaining air is supplied from the secondary air passage 1 to the secondary air port 13 provided in the vicinity of the flame port 11 and contributes to combustion. When the combustion amount is large, the air amount adjusting means 14 is opened and a large amount of air is introduced into the carburetor 5 to promote combustion. When the combustion amount is small, the primary air passage 8 is closed and combustion is performed. The air was pressurized to improve wind resistance and expand the combustion range.
[0005]
[Problems to be solved by the invention]
  However, in the conventional combustion apparatus, when the combustion apparatus is configured more compactly, first, the opening area of the flame opening 11 is reduced, high-load combustion is performed, and further, a large amount of combustion air is supplied into the carburetor 5 at the maximum combustion. Since the blue flame 15 is shortened by the method of setting to a high primary air ratio, the air flow is determined based on the cross-sectional area of the air passage 7 and the rotational speed of the air blowing fan 6 adjusted at the time of maximum combustion. When the amount adjusting means 14 is in the open mode state, the combustion amount is reduced to a small value, and the rotational speed of the blower fan 6 is set to the minimum rotational speed of the blower fan 6 at the minimum combustion amount (minimum rotational speed at which the combustion device can maintain wind resistance). Even if the combustion air is reduced to a lower level, the amount of combustion air still exceeds that required, and the blue flame 15 is cooled to excess combustion air, causing lifting and generating a large amount of odor. But Was Tsu. Further, at the time point, when the combustion amount is small, the maximum combustion amount in the closed mode based on the cross-sectional area of the air passage 7 combined by closing the primary air passage 8 and the rotational speed of the blower fan 6 and the air flow There was a problem that the rotational speed of the fan 6 could not match or overlap.
[0006]
  Further, in the combustion apparatus, in order to obtain a region with a smaller amount of combustion, the primary air passage 8 is closed and the combustion air is pressurized to improve the wind resistance, and the temperature of the flame port 11 rises to increase the red hot state. Therefore, the cross-sectional area of the blower passage 7 and the rotational speed of the blower fan 6 are set so as to avoid conditions that cause backfire to the mixing chamber 9 and thermal deformation of the flame outlet 11. As a starting point, the combustion amount is increased in the closed mode state in which the air amount adjusting means 14 is closed, and the rotational speed of the blower fan 6 is set to the maximum rotational speed of the blower fan 6 at the maximum combustion amount (maximum capable of maintaining the performance of the blower fan 6). Even if the combustion air is increased by increasing the number of revolutions to a limited number of revolutions), the required amount of combustion air is still insufficient at that time, the blue flame 15 becomes mixed with yellow flame, and soot is generated. there were. Further, when the combustion amount is large, the point is the minimum combustion amount and the blower fan in the open mode based on the sectional area of the blower passage 7 and the rotational speed of the blower fan 6 combined by opening the primary air passage 8. There was a problem that the rotational speed of 6 could not match or overlap.
[0007]
  Also, when installing the combustion device outdoors, it is necessary to set the minimum rotational speed at the minimum combustion amount of the blower fan 6 to be higher than the rotational speed to withstand wind pressure such as strong wind in actual use. If the cross-sectional area of the air flow path 7 and the rotational speed of the blower fan 6 are used as a base point, in order to obtain an appropriate amount of combustion air of the maximum combustion amount, the rotational speed increases significantly and a load is imposed on the fan motor. There is a problem that the blower fan 6 becomes huge.
[0008]
[Means for Solving the Problems]
  In order to solve the above problems, the present inventionA vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, Some dampers are set to be approximately convex, and other dampers are set to be approximately concave.Is.
[0009]
  According to the above invention, since the vaporizing air conditioner varies the blowing resistance in the blowing pipe according to each combustion amount and controls the amount of combustion air to the vaporizer within an appropriate range, Thus, redness and odor generation at the flame outlet are suppressed, and a combustion amount adjustment range is large and a compact combustion apparatus can be configured. Then, by configuring the plurality of dampers to overlap and open and close, it is possible to accurately change the blowing resistance and simplify the configuration.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  The combustion apparatus of the present invention comprises:A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, Some dampers are set to be approximately convex, and other dampers are set to be approximately concave.Is.
[0011]
  Further, a vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a flame opening provided on the downstream side of the mixing passage, and a blower pipe communicating with a part of the vaporizer And an air passage into which the air duct is inserted, an air passage provided in the air passage, and when the combustion amount changes between the maximum and minimum, the air flow resistance in the air duct includes a region including the maximum combustion amount, and a minimum A vaporizing air conditioner configured by combining a plurality of dampers so as to be variable to a plurality of modes including a region including a combustion amount and an intermediate region of the region, and the vaporizing air conditioner The protrusions provided on some dampers prevent each damper from sticking..
[0012]
  Further, a vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a flame opening provided on the downstream side of the mixing passage, and a blower pipe communicating with a part of the vaporizer And an air passage into which the air duct is inserted, an air passage provided in the air passage, and when the combustion amount changes between the maximum and minimum, the air flow resistance in the air duct includes a region including the maximum combustion amount, and a minimum A vaporizing air conditioner configured by combining a plurality of dampers so as to be variable to a plurality of modes including a region including a combustion amount and an intermediate region of the region, and the vaporizing air conditioner Has a plurality of through holes in some dampers, and this through hole is set so that the opening area of the through hole arranged near the bottom of the blower pipe is larger than the opening area of the other through holes arranged.
[0013]
  Also,A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount Including the region and A vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode with an intermediate area of the area, and the vaporizing air conditioner The drive angle of the damper is set differently when the resistance is varied from the region including the maximum combustion amount to the intermediate region and when the resistance is varied from the region including the minimum combustion amount to the intermediate region..
[0014]
  Furthermore, a vaporizer that vaporizes liquid fuel, a mixing passage that communicates with a part of the vaporizer, a flame outlet that is installed downstream of the mixing passage, and a blower pipe that communicates with a part of the vaporizer And an air passage into which the air duct is inserted, an air passage provided in the air passage, and when the combustion amount changes between the maximum and minimum, the air flow resistance in the air duct includes a region including the maximum combustion amount, and a minimum A vaporizing air conditioner configured by combining a plurality of dampers so as to be variable to a plurality of modes including a region including a combustion amount and an intermediate region of the region, and the vaporizing air conditioner When the operation of changing the blowing resistance in the blow pipe to the intermediate region between the region including the maximum combustion amount and the region including the minimum combustion amount is performed, the intermediate region after the operation is performed in the region including the minimum combustion amount. It was set to perform a variable operation.
[0015]
  Therefore,
  (1) When the combustion amount changes between maximum and minimum, each damper is opened and closed in order to change the blowing resistance in the blowing pipe to a multi-stage mode, and the combustion air amount to the carburetor is appropriately adjusted accordingly Therefore, it is possible to configure a combustion apparatus having a large combustion amount adjustment range and a compact size. In addition, by arranging a plurality of dampers so as to be opened and closed, it is possible to accurately change the blowing resistance and simplify the configuration.
  (2) Reducing the area of overlapping parts other than those necessary for multiple dampers to open and close, reducing the weight of each damper, reducing the burden on the drive unit and ensuring reliable opening and closing operations and durability Can be improved
  (3) Since the protrusions form gaps between the dampers, even when the dampers overlap each other in the mode including the minimum combustion amount, they do not adhere closely, and air-fuel mixture or water vapor flows between the dampers. Even if condensation occurs, the damper does not stick and can be reliably opened and closed.
  (4) Among the through holes provided in some dampers, the opening area of the through holes arranged in the vicinity of the bottom of the blower pipe is configured to be larger than the opening area of the other through holes arranged, so that the combustion amount is intermediate In this region, the combustion air can be uniformly and efficiently flowed into the blower tube, and the flow of the combustion air introduced into the carburetor can be maintained uniformly to form a uniform air-fuel mixture.
  (5) The damper driving angle is set differently when the blowing resistance in the blower pipe is varied from the region including the maximum combustion amount to the intermediate region and when changing from the region including the minimum combustion amount to the intermediate region. Since the combustion amount is in the middle region, when opening other dampers for some dampers, the hysteresis that occurs with respect to the operating direction of the driving device is eliminated by changing the driving angle. The damper can be set at a predetermined angle
  (6) When performing an operation of changing the blowing resistance in the blower pipe to an intermediate region between the region including the maximum combustion amount and the region including the minimum combustion amount, after performing the operation in the region including the minimum combustion amount, Since it is set to perform variable operation to the region, when the amount of combustion is in the intermediate region, when opening other dampers for some dampers, each damper is activated and set from the closed state, The damper can be set at a predetermined angle under the same conditions.
  It will act as such.
[0016]
[Reference Example]
Before describing embodiments of the present invention, reference embodiments which are prerequisites thereof will be described with reference to the drawings.
[0017]
(Reference Example 1)
  1-7,Kerosene, which is a liquid fuel, is sucked up from a fuel tank (not shown) to a fuel pump 16 that is a fuel supply means, and is supplied to a fuel supply nozzle 18 via an oil feed pipe 17. Reference numeral 19 denotes a vaporizer provided in front of the fuel supply nozzle 18, which is made of a material having good heat conductivity such as aluminum die casting, and has an electric heater 20 embedded therein. A carburetor lid 22 is provided on the side surface of the carburetor 19 so that the front end of the blower tube 21 faces the periphery thereof with a gap.
[0018]
  The fuel supply nozzle 18 is inserted into the blower pipe 21 toward the vaporizer 19. A gas mixture outlet 23 is provided below the vaporizer 19, and a mixing passage 24 is provided below the gas mixture outlet 23. A plurality of porous flame openings 25 are provided downstream of the mixing passage 24. 26 is a burner case covering the entire combustion part, and the space inside thereof is an air passage 27 provided so as to surround the periphery of the carburetor 19, the mixing passage 24 and the flame outlet 25.
[0019]
  Reference numeral 28 denotes a secondary air passage having a large number of secondary air ejection holes 29 formed on the upper surface, and a plurality of air passages are alternately arranged with the flame opening 25 so as to supply air to the vicinity of the flame opening 25. One end of the secondary air passage 28 communicates with the air passage 27.
[0020]
  Reference numeral 30 denotes a heat shield, and a combustion chamber 31 is formed inside thereof. Reference numeral 32 denotes a fin-shaped heat receiving portion formed on the back surface of the vaporizer 19 so as to protrude toward the combustion chamber 31. A heat exchanger 33 is placed on the top plate portion 34 of the air passage 27 so as to cover the upper side of the flame opening 25. 35 is a blower for supplying combustion air. The impeller uses a turbo fan, a radial fan, or the like that can generate a high pressure, and is rotated by a motor, and communicates with a part of the side of the air passage 27. The air passage 36 is connected.
[0021]
  The blower pipe 21 is provided inside the blower passage 36. The blower pipe 21 is provided with a plurality of communication ports 37 communicating with the blower passage 36 at a position before being inserted into the vaporizer lid 22. Reference numeral 38 denotes a vaporizing air conditioner provided in the air passage 36, and a damper 41 composed of a closing damper 39 and an upper damper 40 that change the blowing resistance of the air pipe 21 by opening and closing, and these closing damper 39 and the upper part. It is comprised with the drive device 42 which rotationally drives the damper 40. FIG.
[0022]
  The closing damper 39 and the upper damper 40 are provided so as to rotate coaxially about the plate surfaces of the two plates, and may be opened or closed in the vertical direction or in the horizontal direction. As a method of configuring the same on the same axis, a rod-shaped shaft 45 is inserted into a through-hole of a support part 43 formed by bending a part of the closing damper 39 and a support part 44 formed by bending a part of the upper damper 40. The shaft 45 is provided so as to be coaxially supported by a hole provided in a damper receiving portion 46 provided in the upper part of the blower pipe 21.
[0023]
  The closing damper 39 is provided on the side in contact with the inlet of the blower pipe 21, and a plurality of through holes 47 are provided in part. The upper damper 40 is provided at a position overlapping the outside of the closing damper 39, and in the region mode including the minimum combustion amount, substantially contacts the closing damper 39, substantially closes the through hole 47, and has an intermediate combustion amount region. In this mode, an angle is provided between the closed damper 39 and the through hole 47 is opened.
[0024]
  The driving device 42 is configured by using a stepping motor, a solenoid, a motor, a gear, a cam, and the like so that the closing damper 39 and the upper damper 40 perform their respective operations, and the driving portion of the driving device 42 is connected to the closing damper 39. It is connected to the upper damper 40. Reference numeral 48 denotes a blue flame formed on the flame opening 25.
[0025]
  Next, the operation and action will be described. When the power source (not shown) is turned on, the electric heater 20 is energized and the vaporizer 19 is heated. When the vaporizer 19 reaches a predetermined temperature, the air blowing means 35 is activated, and combustion air is supplied. The air supplied to the air passage 36 is adjusted in the amount of air by the closing damper 39 and the upper damper 40 of the vaporizing air regulator 38 and then into the primary air and the secondary air passage 28 supplied into the air duct 21. It is divided into the supplied secondary air.
[0026]
  At the same time, the fuel pump 16 is operated, and fuel is sprayed from the fuel supply nozzle 18 to the vaporizer 19. The fuel is vaporized on the wall surface of the high-temperature carburetor 19, transported to the mixing passage 24 while being mixed with the primary air, and ejected from the flame opening 25 as a combustible air-fuel mixture. At this time, the combustible air-fuel mixture is ignited by the discharge of an igniter (not shown) and combustion starts.
[0027]
  Further, since the secondary air passes through the secondary air passage 28 inside the burner case 26 and is supplied to the secondary air outlet 29 disposed in the vicinity of the flame outlet 25, the blue flame 48 is burned in the combustion chamber 31. Promote. The high-temperature combustion gas generated by the combustion is heat-exchanged by the heat exchanger 33 and discharged.
[0028]
  1 and 2Features of the reference exampleThe vaporizing air conditioner 38 is provided in the air passage 36, and is introduced into the air duct 21 in the mode including the region where the combustion amount is maximum, the mode including the region where the combustion amount is minimum, and the intermediate mode. The primary air amount to be adjusted is to adjust in stages. With this configuration, the combustion amount adjustment range can be greatly expanded, and the wind resistance performance can be kept good in this wide adjustment range.
[0029]
  That is,As shown in FIG. 3, at the point A where the combustion amount is maximum, the closing damper 39 and the upper damper 40 of the vaporizing air regulator 38 are opened to the maximum (FIG. 1), the passage resistance of the blower pipe 21 is minimized, and the blower means 35 fan speed is maximized.
[0030]
  At this time, in particular, the angle of the closing damper 39 is maximized, and the upper damper 40 may be either in contact with the closing damper 39 or set at an angle and further opened wide.
[0031]
  next,When reducing the amount of combustion, reducing the output of the fuel pump 16 and simultaneously reducing the rotational speed of the blower results in a state of point B (this is the maximum mode region). As a result, a large amount of air is introduced into the vaporizer 19 between the points A and B, and the combustion reaction is promoted, so that the flame volume is reduced and the flame length is shortened.
[0032]
  Also,Between point A and point B, the air-fuel mixture flow rate from the flame opening 25 is also high, and the variable range of the combustion amount can be controlled to be small, so that the area of the flame opening can be made small, and as a result, the combustion chamber 31 can also be made compact. The equipment can also be reduced in size.
[0033]
  Also,By increasing the ratio of the vaporizing air introduced into the vaporizer 19 (primary air ratio), it is possible to suppress the generation of yellow flame in the blue flame 48 and form a beautiful flame form that is visually prevented from generating soot.
[0034]
  But,As shown in FIG. 4, the smaller the combustion amount is, the more the primary air ratio (equivalent ratio of vaporizing air) is kept constant, the opening area of the flame opening 25 does not change. It adheres to the mouth 25 and generates red heat (the hatched range in FIG. 4).
[0035]
  In order to avoid this red heat range, it is necessary to lower the primary air ratio as the combustion amount is reduced.That is,At the point F at which the combustion amount is minimized, the closing damper 39 is brought into contact with the blower pipe 21 and the upper damper 40 is brought into contact with the outer side of the blower pipe 21 (FIG. 6). To do.
[0036]
  AndThe blower rotation speed of the blowing means 35 is minimized. As a result, a small amount of air is introduced into the vaporizer 19 from the communication port 37 of the blower tube 21 to slow down the combustion reaction, so that the flame does not adhere to the flame port 25 even if the combustion amount is reduced. As a result, the temperature of the flame opening 25 does not rise to a red hot state, the backfire to the mixing passage 24 and the thermal deformation of the flame opening 25 can be prevented, and the combustion amount can be narrowed down to reduce the combustion amount adjustment range. It can be taken big.
[0037]
  But,When the primary air ratio is lowered, red heat is reduced, but the blue flame 48 is likely to become yellow flame, and soot is likely to be generated.That meansThe variable range of the combustion amount from point F to point E (the region of the minimum mode) with the same primary air ratio is small and cannot reach the combustion amount at point B in FIG.
[0038]
  Therefore, as shown in FIG. 4, in order to bypass the red heat range, an intermediate combustion point D is provided in which the primary air ratio is slightly higher than the point F at which the combustion amount is minimized. At this point D, the closing damper is provided. 39 is brought into contact with the blower pipe 21, the blower pipe 21 is substantially closed, and the upper damper 40 is opened at an angle so as to cover from the outside (FIG. 7), and the through hole 47 of the closing damper 39 is opened to open the blower pipe. The air blowing resistance of 21 is set to an intermediate mode between the mode including the region where the combustion amount is maximum and the mode including the region where the combustion amount is minimum, and the point C reaches the point B with the same primary air ratio as it is. (This is the middle mode region).
[0039]
  As a result, an appropriate amount of air is introduced into the carburetor 19 to promote the combustion reaction, so that stable combustion can be performed so that the volume of the flame is small and the flame is not in close contact.
[0040]
  Thus, as shown in FIGS. 3 and 4, the primary air ratio and the blower rotation speed are finely controlled according to each combustion amount.That is,By moving the damper to the open / middle / closed position and changing the blower speed in the range from maximum to minimum at each position, the maximum combustion can be made larger and the minimum combustion made smaller. The combustion amount adjustment range can be greatly expanded.
[0041]
  As shown in FIG.Reference exampleAccording to the method, the combustion amount adjustment range can be greatly expanded. This is because, in actual use, the wind resistance performance can be maintained within a wide combustion amount adjustment range.
[0042]
  That is,When looking at the PQ characteristics of the blower constituting the blower 35 as shown in FIG. 5, in the maximum mode, the load curve X changes from the point a to the point b between the curve A and the curve B. Point b is the lower limit pressure Pb for maintaining wind resistance performance, and wind resistance performance cannot be maintained if the rotational speed of the blower is lowered below that. Therefore, in the case of the minimum mode, the load curve Z changes from the curve E to the curve F from the point e to the point f.
[0043]
  Therefore,The air volume can be changed from Qa to Qf up to the lower limit pressure Pf.
[0044]
  In the mode where the combustion amount is maximum, a large amount of air is introduced into the carburetor 19, so that the blue flame of the flame is promoted and a flame that does not easily generate soot even if the air pressure is insufficient due to wind pressure is obtained. It is done.
[0045]
  In the mode in which the combustion amount is minimized, the passage resistance of the blower pipe 21 is maximized. Therefore, the blower 35 supplying the combustion air increases the pressure by increasing the number of revolutions to form a flame that can withstand the wind pressure. it can. In the mode in which the combustion amount is in the middle, the load curve Y is changed from the curve C to the curve D on the load curve Y from the point c to the point d, and the mode in which the combustion amount becomes maximum and the mode in which the combustion amount becomes minimum. Can be connected using an appropriate amount of combustion and the rotational speed of the blower 35 to maintain good combustion characteristics.
[0046]
  Also,As shown in FIG. 3, are the minimum rotational speed B point of the mode in which the combustion amount becomes maximum more than the rotational speed of the minimum rotational speed F point of the minimum combustion amount, and the rotational speed of the minimum rotational speed point D of the intermediate mode being the same? If set to more than that, a flame that can always withstand wind pressure can be formed in any mode.
[0047]
  Also,If the maximum number of revolutions E of the mode where the amount of combustion is the smallest and the maximum number of revolutions C of the intermediate mode are set lower than the maximum number of revolutions A of the maximum number of revolutions A The motor is not burdened and the reliability can be improved.
[0048]
  Also,Since the closing damper 39 and the upper damper 40 are overlapped and opened and closed on the same axis, it is possible to accurately change the blowing resistance and simplify the configuration.
[0049]
  Also,When the combustion amount changes between the maximum and minimum, a part of the closing damper 39 and the upper damper 40 changes the blowing resistance in the blowing passage 36 simultaneously with the inside of the blowing pipe 21 to a multi-stage mode, and the combustion air The distribution of the secondary air other than the portion introduced into the carburetor 19 is also varied according to each mode, and the ratio of the vaporization air (primary air) and the secondary air introduced into the carburetor 19 is set to the maximum mode. As a standard, the minimum mode has a large proportion of secondary air, and the intermediate mode has a large proportion of primary air, so the maximum mode improves flame holding and promotes combustion. In red prevention and intermediate mode, yellow flame and soot can be prevented.
[0050]
  Also,Since the primary air and the secondary air are simultaneously changed, the vaporizing air regulator 38 can be configured without increasing the number of parts.
[0051]
  Also,The blower pipe 21 is substantially closed with the closing damper 39 and the upper damper 40 when the combustion amount approaches the minimum, and the vaporizing air introduced into the vaporizer 19 is supplied from the communication port 37 provided in the blower pipe 21. The air amount is managed by the communication port 37, and the distribution in which the blue flame 48 is not in close contact with the flame port 25 can be properly maintained to prevent the occurrence of yellow flame and soot.
[0052]
  (Reference Example 2)
  In FIG. 8, the difference from the first embodiment is that the upper damper 40 that is directly operated by the driving device 42 and the closing damper 39 that is variable by a pushing portion 49 provided in a part of the upper damper are formed. The air conditioner 38 is used.
[0053]
  Also,The pushing portion 49 is set so that the closing damper 39 and the upper damper 40 open at a predetermined angle, and is configured to be bent or spaced at an angle that can be held.
[0054]
  In addition,Reference Example 1 andThe same reference numerals have the same structure, and the explanation isThe reference example 1 is used..
[0055]
  Next, the operation and action will be described. When the combustion amount is varied to the maximum region, the closing damper 39 is pressed by the pressing portion 49 of the upper damper 40 while the upper damper 40 is rotated on the same axis by the driving device 42. However, since the required angle can be changed, the driving power for the closing damper 39 is not required, and only the upper damper 40 is driven, so that the configuration can be simplified.
[0056]
  (Reference Example 3)
  In FIG.Different from Reference Examples 1 and 2The point is that the closing damper 39 is provided with a contact portion 50 and brought into contact with the blower pipe 21 or the blower passage 36 so that the closing damper 39 is set and held at the maximum angle in the mode including the maximum combustion amount. A vaporizing air conditioner 38 configured as described above.
[0057]
  Moreover, the hit part 50 isIn order to press against the upper part of the blast pipe 21, the end part of the closing damper 39 is bent, and the angle is set by the height of the part.
[0058]
  In addition,The same reference numerals as those in Reference Examples 1 and 2 have the same structure. Incorporating
[0059]
  Next, the operation and action will be described. When the combustion amount is in the region including the maximum combustion amount, the contact portion 50 contacts a part of the air duct 21 or the air passage 36, so that the closing damper 39 is further opened. Therefore, the distribution of the combustion air introduced into the carburetor 19 can be fixed and maintained at the maximum amount.
[0060]
  In the following, embodiments of the present invention will be described with reference to the accompanying drawings.
[0061]
  The previousThose having the same reference numerals as in the reference embodiment have the same structure, and those in the reference embodiment are used for the description.
[0062]
【Example】
  (Example 1)
  In FIG. 10, the difference from each reference example is thatWhen the closing damper 39 and the upper damper 40 are overlapped with each other, the vaporizing air conditioner 38 is formed in which the closing damper 39 is formed into a substantially convex shape of a flat plate and the upper damper 40 is formed into a substantially concave shape of a flat plate.
[0063]
  Further, the upper damper 40 may be further cut out into a substantially Y shape by cutting out the concave lower portion, and the area may be reduced to a point where the through hole 47 provided in the closing damper 39 can be closed. Further, in order to rotate the closing damper 39 and the upper damper 40 on the same axis, a support portion 51 is provided at the end of each shape so as not to hinder the rotation.Yes.
[0064]
  Next, the operation and action will be described. The unnecessary area of the overlapping portion other than the portion shared by the closing damper 39 and the upper damper 40 for opening and closing is reduced, and the closing damper 39 and the upper damper 40 are reduced in weight. Therefore, the burden on the driving device 42 can be reduced, and a reliable opening / closing operation and durability can be improved.
[0065]
  Also,Since the support portion 51 for rotating the closing damper 39 and the upper damper 40 on the same axis is provided at the end portion of the shape, a good rotation state can be obtained.
[0066]
  (Example 2)
  In FIG. 11, the points different from each reference example and example 1 are as follows.A protrusion 52 is provided on the closing damper 39 or the upper damper 40, and the vaporizing air conditioner 38 is configured so that the closing damper 39 and the upper damper 40 are not in close contact via the gap 53.
[0067]
  Also,The size of the protrusion 52 is set so that the closing damper 39 can substantially close the blower tube 21, and a plurality of installation positions are provided at symmetrical positions so that the closing damper 39 and the upper damper 40 do not tilt. Yes. Further, the shape of the protrusion 52 is substantially hemispherical and reduces the contact area between the closing damper 39 and the upper damper 40.Yes.
[0068]
  Next, the operation and action will be described. Since the protrusion 52 forms a gap 53 between the closing damper 39 and the upper damper 40, the closing damper 39 and the upper damper 40 overlap each other in the mode including the minimum combustion amount. Even if air-fuel mixture or water vapor flows between the closing damper 39 and the upper damper 40 to cause condensation, the closing damper 39 and the upper damper 40 do not adhere to each other, and a reliable opening / closing operation can be performed.
[0069]
  (Example 3)
  In FIG. 12, each reference example and the points different from the examples 1 and 2 are as follows.The vaporizing air regulator 38 in which the arrangement of the through holes 47 provided in the closing damper 39 is configured so that the total opening area of the through holes 47 provided in the vicinity of the bottom portion 62 of the blower pipe 21 is larger than the other through holes 47 arranged elsewhere. HaveIt is to be.
[0070]
  Next, the operation and action will be described. Since the upper damper 40 rotates and opens the through hole 47 when the combustion amount is in an intermediate region, the transparent portion provided in the vicinity of the bottom portion 62 of the blower pipe 21 farthest from the rotation axis. Since the gap from the closing damper 39 to the upper damper 40 is large from the hole 47, the combustion air can efficiently flow uniformly.
[0071]
  Also,Since the through-hole 47 is provided in the portion where the gap from the closing damper 39 to the upper damper 40 is large, even if the rotation angle of the upper damper varies, the variation in blowing resistance can be reduced.
[0072]
  (Example 4)
  In FIG.The difference from each Reference Example and Examples 1-3 isThe driving angle of the upper damper 40 is made different when the blowing resistance in the blowing pipe 21 is changed from the region including the maximum combustion amount to the intermediate region and when the blowing resistance is changed from the region including the minimum combustion amount to the intermediate region. In addition, a vaporizing air conditioner 38 provided with a controller 76 for instructing the driving device 42 is provided.It is to be.
[0073]
  Next, the operation and action will be described. When the combustion amount is in the middle region, in order to set the opening angle of the upper damper 40 with respect to the closing damper 39, when the operation is performed from the direction of the region including the maximum combustion amount, Since there is a characteristic of the driving device 42 that the opening angle is increased without the damper 40 being lowered, if the controller 76 sets a large driving angle in advance, the opening angle of the upper damper 40 includes the minimum combustion amount. The setting can be made at the same predetermined angle as when changing from the region to the intermediate region, and an appropriate amount of air can be obtained.
[0074]
  (Example 5)
  In FIG.The difference from each reference example and Examples 1-4 isWhen performing an operation of changing the blowing resistance in the blow pipe 21 to an intermediate region between the region including the maximum combustion amount and the region including the minimum combustion amount, the intermediate region after the operation is performed in the region including the minimum combustion amount. A vaporizing air conditioner 38 provided with a controller 77 for instructing the driving device 42 to perform a variable operation.It is to be.
[0075]
  Next, the operation and action will be described. When the combustion amount is in the middle region, in order to set the opening angle of the upper damper 40 with respect to the closing damper 39, when the operation is performed from the direction of the region including the maximum combustion amount, Due to the characteristic of the driving device 42 that the opening angle becomes large without the damper 40 being lowered, the controller 77 always operates the opening angle of the upper damper 40 with respect to the closing damper 39 from the closed state. If set, the upper damper 40 can be set to a predetermined angle under the same conditions, and an appropriate amount of air can be obtained.
[0076]
  The above reference examples and technical significance of the examples will be summarized as follows.
[0077]
  (1) A blower pipe communicated with the carburetor, a blower passage into which the blower pipe is inserted, and a blower resistance in the blower pipe provided in the blower passage when the combustion amount changes between maximum and minimum. A vaporizing air conditioner consisting of a plurality of dampers that can be changed to a multi-stage mode is provided.By controlling the rotation speed of the blower within an appropriate range, A compact combustion device can be realized by shortening the flame and reducing the flame volume.
[0078]
  (2) In the minimum combustion, there is an effect of expanding the adjustment range of the combustion amount by preventing the blue flame from adhering to the flame mouth and preventing the red heat of the flame mouth. Also, when the combustion amount varies between the maximum and minimum, the blowing pressure to the carburetor is changed step by step, so that proper air distribution to the carburetor and proper rotation of the blower are achieved. By using the rotation number, it is possible to realize a combustion apparatus with improved wind resistance and less odor generation.
[0079]
  (3) By opening and closing a plurality of dampers, it is possible to accurately change the blowing resistance and simplify the configuration.
[0080]
  (4) The vaporizing air conditioner is composed of a damper that is directly actuated by a driving device and provided with a pushing portion in part, and a damper that is pushed and driven by the pushing portion. The drive power is not required and the configuration can be simplified.
[0081]
  (5) Combustion introduced into the carburetor since the damper does not open any more in the mode of the region including the maximum combustion amount by bringing the contact portion provided in some dampers into contact with the blower pipe or the blow passage. The air distribution can be fixed and maintained at the maximum amount.
[0082]
  (6) Since some dampers are formed in a substantially convex shape and other dampers are formed in a substantially concave shape, the weight of each damper is reduced, the burden on the driving device is reduced, and a reliable opening / closing operation and durability are improved. Can do.
[0083]
  (7) Since some of the dampers are provided with protrusions, even when the dampers overlap each other in the mode including the minimum combustion amount, they do not adhere to each other, and air-fuel mixture or water vapor flows between the dampers to cause condensation. However, the damper does not adhere and a reliable opening / closing operation can be performed.
[0084]
  (8) Since the opening area of the through hole provided in the vicinity of the bottom of the blower pipe among the through holes provided in some dampers is configured to be larger than the opening area of the other through holes, Combustion air can be made to flow uniformly and efficiently from the through hole provided in the vicinity of the bottom of the distant blast pipe.
[0085]
  (9) The damper driving angle is set differently when the blowing resistance in the blower pipe is varied from the region including the maximum combustion amount to the intermediate region and when changing from the region including the minimum combustion amount to the intermediate region. Since the operation is performed from the direction of the region including the maximum combustion amount, the characteristic of the drive device that the opening angle is increased without the damper being fully lowered is changed from the region including the minimum combustion amount to the intermediate region. The setting can be made at the same predetermined angle as when changing, and an appropriate amount of air can be obtained.
[0086]
(10) When performing an operation of changing the blowing resistance in the blower pipe to an intermediate region between the region including the maximum combustion amount and the region including the minimum combustion amount, after performing the operation in the region including the minimum combustion amount, Since the operation is instructed to perform the variable operation to the region, when operating from the direction of the region including the maximum combustion amount, avoiding the characteristic of the drive device that the release angle does not decrease and the opening angle becomes large, the damper is opened. The angle is always operated from the closed state, the damper can be set to a predetermined angle, and an appropriate amount of air can be obtained..
[0087]
【The invention's effect】
  As described above, according to the combustion apparatus of the present invention, by controlling the rotational speed of the blower within an appropriate range, at the maximum combustion, the blue flame is shortened and the flame volume is reduced. It can be done.
[Brief description of the drawings]
FIG. 1 of the present inventionReference Example 1Sectional view of the main part of the combustion device
FIG. 2 is a perspective view of the main part of the combustion apparatus.
[Fig. 3] Control characteristic diagram of fan rotation speed of the combustion device
FIG. 4 is a control characteristic diagram of the primary air ratio of the combustion apparatus.
FIG. 5 is a characteristic diagram of the blower of the combustion apparatus
FIG. 6 is an enlarged sectional view of the main part of the combustion apparatus.
FIG. 7 is an enlarged sectional view of the main part of the combustion apparatus.
[Fig. 8] of the present inventionReference Example 2The main part expanded sectional view of the combustion device in
FIG. 9 shows the present invention.Reference Example 3The main part expanded sectional view of the combustion device in
10 (a) and 10 (b) show the present invention.Example 1Of the main part of the combustion device
FIG. 11 shows the present invention.Example 2The main part expanded sectional view of the combustion device in
FIG. 12 shows the present invention.Example 3The main part expanded sectional view of the combustion device in
FIG. 13 shows the present invention.Example 4The main part expanded sectional view of the combustion device in
FIG. 14 shows the present invention.Example 5The main part expanded sectional view of the combustion device in
FIG. 15 is a cross-sectional view of the main part of a conventional combustion apparatus
[Explanation of symbols]
  19 Vaporizer
  21 Air duct
  24 Mixing passage
  25 Flame outlet
  36 Air passage
  38 Air conditioner for vaporization
  41 Damper

Claims (5)

A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, A combustion apparatus in which some dampers are set to be substantially convex and other dampers are set to be substantially concave . A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, Combustion device in which each damper is prevented from being fixed by a protrusion provided on a part of the damper . A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, Combustion apparatus in which some dampers have a plurality of through holes, and the through holes are set such that the opening areas of the through holes arranged near the bottom of the blower pipe are set larger than the opening areas of the other through holes arranged . A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage, and a blown resistance in the blower tube including a maximum combustion amount when the combustion amount changes between a maximum and a minimum, and a minimum combustion amount And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, Combustion in which the damper drive angle is set differently when the blowing resistance in the blower pipe is varied from the region containing the maximum combustion amount to the intermediate region and when changing from the region containing the minimum combustion amount to the intermediate region. apparatus. A vaporizer that vaporizes liquid fuel; a mixing passage that communicates with a portion of the vaporizer; a flame outlet that is disposed downstream of the mixing passage; and a blower pipe that communicates with a portion of the vaporizer; A blower passage in which the blower tube is inserted, a region provided in the blower passage and when the combustion amount changes between the maximum and the minimum, a blower resistance in the blower tube includes a region including the maximum combustion amount, and a minimum combustion amount. And a vaporizing air conditioner configured by combining a plurality of dampers so as to be able to change to a multi-stage mode between the area and the middle area of the area, the vaporizing air conditioner, When performing an operation to change the blowing resistance in the blow pipe to an intermediate region between the region including the maximum combustion amount and the region including the minimum combustion amount, the operation is performed to the region including the minimum combustion amount and then to the intermediate region. Combustion device that is set to perform the operation .

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