JPH072737U - Combustion appliance combustion fan - Google Patents

Abstract

(57) [Abstract] [Purpose] Cooling the fan motor of a combustion fan by using part of the combustion air prevents burnout of the fan motor even if the combustion unit and the combustion fan are placed close to each other. Provide a combustion fan. [Structure] Upper and lower housing cases 2 with built-in blades 27
The fan motor 32 is fixed to the housing 30 made up of 8.29, and the fan motor 32 is fixed so that the fan motor 32 is fixed so as to communicate with the exhaust hole 35 provided in the heat shield tube 33 that covers the fan motor 32. A ventilation hole 34 was provided around the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a combustion fan used for a combustion appliance such as an oil stove.

[0002]

[Prior art]

 Conventionally, in combustion fans used for combustion appliances that heat in all directions, by installing a combustion fan on the front and side surfaces of the fuel tank at the bottom of the main body of the combustion appliance, the combustion fan is installed. It was installed farther away and at a position where it was not affected by combustion heat.

[0003]

[Problems to be solved by the device]

 By the way, with this conventional type, there is a problem that when the size of the combustion equipment is reduced, the combustion part and the combustion fan come close to each other, so that they are affected by the combustion heat and the fan motor attached to the combustion fan is burned by the combustion heat of the combustion part. there were.

[0004]

[Means for solving problems]

 The present invention focuses on this point and solves the above-mentioned drawbacks. In particular, the configuration is composed of a blade that blows air, a housing that incorporates the blade, and a fan motor that is fixed to the surface of the housing and that drives the blade. In a combustion fan consisting of a heat shield that shields the fan motor, an exhaust hole is provided in the heat shield and the exhaust hole is communicated with the housing where the fan motor is fixed. It has a vent hole.

[0005]

[Action]

 In this combustion fan 5, the heat shield cylinder 33 covers the fan motor 32 to protect the fan motor 32 from the heat of combustion in the burner section 10, and the heat shield cylinder 33 is provided with an exhaust hole 35 to communicate with the exhaust hole 35. By providing the ventilation hole 34 around the fan motor 32 of the housing 30 as described above, a part of the air blown from the combustion fan 5 to the combustion unit 2 is guided from the ventilation hole 34 to the exhaust hole 35, and the fan motor 32 and the heat shield cylinder 33 are cooled. Therefore, even if the combustion fan 5 is arranged near the burner unit 10, the burnout of the fan motor 32 can be prevented.

[0006]

【Example】

Next, a combustion fan according to the present invention will be described with reference to a preferred embodiment shown in the drawings. Reference numeral 1 is a vaporization type liquid fuel combustion instrument, in which a combustion part 2 is provided with a bottomed cylindrical vaporization pot 4 having a heater 3 at the bottom, and one side wall thereof is a combustion air jet communicating with a combustion fan 5. 6 and a nozzle body 9 for injecting fuel from a fuel tank 7 by means of an electromagnetic pump 8 located in the center of the combustion air jet 6 and injecting fuel oil into the heated vaporization pot 4 to produce vaporized gas. It mixes with combustion air to create a mixed gas.

Reference numeral 10 denotes a hat-shaped burner portion which is located above the vaporization pot 4 and communicates with the inside of the vaporization pot 4. The burner inner wall 12 has a plurality of flame openings 11 on the peripheral wall which is erected from the middle, and the burner. A burner outer wall 14 provided on the outer periphery of the burner inner wall 12 so as to form a gas chamber 13 outside the inner wall 12, a burner outer wall 14 located at the center of the burner inner wall 12 and connecting an opening 15 of the inner wall 12 and a lower portion thereof. It is composed of a convex mixing cylinder 16 and the like which is mounted on the vaporization pot 4 while keeping a space and projects upward.

Reference numeral 17 is a straightening cylinder made of a stainless steel material provided between the vaporization pot 4 and the burner portion 10 for straightening the mixed gas. The tip of the straightening tube is bulged to the middle position of the upper mixing cylinder 17 and is inward. Has an inverted trumpet shape that forms a straightening passage 18 that gradually narrows upward, expands the internal volume of the evaporation pot 4 below, and communicates with the gas chamber 13 by means of a mixing cylinder 17 in the burner section 10. The meandering mixing passage 19 is formed for good mixing.

Reference numeral 20 is a rectifying member provided inside the flame port 11 and made of wire mesh or the like. Reference numeral 21 is a secondary air supply port formed on the outer periphery of the mixing cylinder 17 of the burner section 10, outside the upper part of the vaporization pot 4. The secondary air chamber 22 formed in the periphery is communicated with a plurality of communication ports 24 formed in the flange portion 23 at the upper end of the vaporization pot 4, and the combustion fan 5 flowing in through the supply port 25. The air is blown upward in the vertical direction along the outer circumference of the mixing cylinder 17 and is supplied to the flame from the inside as secondary air.

The combustion fan 5 is a turbo fan, and has blades 27 for sucking air from the suction port 26 to supply the air to the combustion air jet port 6 and the supply port 25, and upper and lower blades 27 having the blade 27 built therein. A housing 30 composed of housing cases 28 and 29, a packing 31 for improving the sealing performance of the upper and lower housing cases 28 and 29, and a fan motor fixed to the upper housing case 28 for rotating the blades 27. 32, and a heat shield tube 33 that covers the fan motor 32 to protect the fan motor 32 from the combustion heat of the combustion section 2.

In order to uniformly cool the fan motor 32 in the housing case 28 above the housing 30, a part of the air blown by the blades 27 uniformly blows the entire fan motor 32. A plurality of ventilation holes 34 are provided at equal intervals in the periphery of the heat shield cylinder 33. The heat shield cylinder 33 is provided with exhaust holes 35 at the apex so that the air blown from the vent holes 34 can be exhausted most smoothly. The outer circumference of the is mirror-finished so that the radiant heat from the combustion section 2 is reflected.

Next, the operation of this embodiment will be described. First, the heater 3 is energized to heat the vaporization pot 4 to the vaporization temperature, and then the fuel oil is injected into the vaporization pot 4 by the nozzle body 9 and the combustion air is supplied through the combustion air jet port 6 to produce the fuel oil. The gas is instantly vaporized and mixed with the combustion air supplied in the vaporization pot 4 to form a mixed gas, which reaches the gas chamber 13 through the mixing passage 19 while being rectified through the rectification passage 18 of the rectification cylinder 17. Combustion starts when the gas is ejected from the flame nozzle 11 and ignited by an appropriate ignition means.

At this time, the secondary air is ejected from the secondary air supply port 21 in the vertical direction, is sequentially supplied to the flame from the lower inside while following the outer periphery of the mixing cylinder 17, and arranges the flame upward. If the combustion is stable, the heat is conducted to the vaporization pot 4 through the inner wall 12 of the burner section 10. After that, the energization of the heater 3 is stopped and the self-heating is stopped. Combustion can be performed only by heat.

Further, when the combustion fan 5 blows air by driving the fan motor 32, a part of the blown air is blown into the heat shield tube 32 through the vent holes 34 provided in the upper housing case 28, and the heat shield tube 32. The fan motor 32 is cooled as well as the heat shield tube 33 by being exhausted from the exhaust hole 35 provided in the fan motor 32, and the burn heat of the fan motor 32 due to the combustion heat from the combustion unit 2 and the heat generation of the fan motor 32 itself. In addition, the heat shield cylinder 33 is prevented from being deformed or damaged by the combustion heat of the combustion section 2.

When the combustion appliance 1 is used with a large heating power, the amount of combustion air required also increases. Therefore, the number of revolutions of the fan motor 32 is increased to increase the amount of blown air, thereby exhausting air from the ventilation holes 34. The amount of air passing through the holes 35 also increases and the cooling capacity also increases. Even if the combustion amount is increased, the fan motor 32 and the heat shield tube 33 can be sufficiently cooled.

The numbers, positions, sizes, etc. of the vent holes 34 and the exhaust holes 35 are not limited to those in the present embodiment, and in short, a part of the combustion air from the combustion fan 5 is provided in the housing 30. It suffices that the fan motor 32 and the heat shield tube 33 are cooled by passing through the exhaust holes 35 provided in the heat shield tube 33.

[0017]

[Effect of device]

 In short, the present invention is directed to a blade 27 that blows air, a housing 30 that houses the blade 27, a fan motor 32 that is fixed to the surface of the housing 30 and drives the blade 27, and a heat shield tube that shields the fan motor 32. In a combustion fan composed of 33, an exhaust hole 35 is provided in the heat shield cylinder 33, and a ventilation hole 34 is provided in the casing 30 around the fan motor 32 so as to communicate with the exhaust hole 35. Therefore, it does not require a dedicated cooling device or complicated structure, and by using a part of the combustion air from the combustion fan with a simple structure, it is possible to cool the fan motor without a significant increase in cost. It is possible to prevent the burner of the fan motor from being burned due to the heat of combustion from the combustion section and the heat of the fan motor itself, and to place the combustion fan close to the combustion section, thus reducing the size of the combustion equipment.

[Brief description of drawings]

FIG. 1 is a perspective view of a combustion instrument according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is an exploded perspective view of a combustion fan according to an embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the same.

FIG. 6 is a sectional view taken along the line AA.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Combustion part 5 Combustion fan 27 Blade 28 Upper housing case 29 Lower housing case 32 Fan motor 33 Heat shield cylinder 34 Vent hole 35 Exhaust hole

Claims (1)

[Scope of utility model registration request] 1. A blade 27 for blowing air, and the blade 27
In a combustion fan including a housing 30 having a built-in housing, a fan motor 32 fixed to the surface of the housing 30 to drive the blades 27, and a heat shield cylinder 33 that shields the fan motor 32, the heat shield A combustion fan for a combustion appliance, characterized in that an exhaust hole (35) is provided in a cylinder (33), and a ventilation hole (34) is provided in the casing (30) around the fan motor (32) so as to communicate with the exhaust hole (35).