JPS5840085B2 - Liquid fuel vaporization burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a burner that vaporizes and burns liquid fuel such as kerosene, and aims to improve the combustion effect.

The present invention will be described below based on an illustrated embodiment in which the invention is applied to an oil stove.

FIG. 1 shows a stove equipped with a burner according to the present invention, in which burner body 3 corresponds to trivet 2 arranged on the top surface of stove body 1.
is installed.

Reference numeral 4 denotes a fuel storage which is attached to the stove body 1 and includes a liquid fuel tank 5 for kerosene or the like and a constant liquid level device 6 that communicates with this tank and keeps the internal liquid level constant at all times, and 7 denotes a burner body 3. A heat shielding source is fixed to the burner so as to surround it, and is fixed to a partition plate 8 provided above the stove body 1, thereby holding the burner body 3 in place.

9 is an air blower installed in the stove body 1, and its air pipe 10
is in communication with the vaporization chamber 11 of the burner body 3.

The vaporization wall 25 in the vaporization chamber 11 has an inverted conical shape such that its upper inner circumferential diameter is larger than its lower inner circumferential diameter.

As shown in Fig. 2, the burner body 3 consists of a cylindrical burner housing 12 with an open upper surface and a burner head 13 placed and fixed on the upper surface of the burner housing. and is fixed to the burner housing 12.

That is, 20 is a dish-shaped aperture plate, and a button threaded portion 22 is formed on the outer surface of an annular peripheral edge 21 raised upward, and this hole threaded portion is formed on the inner peripheral surface of the upper end of the burner housing 12. By screwing into the threaded portion 26, the throttle plate 20 is fixed to the burner housing 12.

A circular aperture opening 24 is provided in the center of the aperture plate 20.
There is a disc-shaped baffle plate 90 arranged at a predetermined distance below the aperture opening, and a plurality of blades 91 connect the baffle plate 90 to a plurality of locations on the rim of the aperture opening 24. ,
The baffle plate is placed horizontally.

A boss 93 having a through hole 92 in the center projects from the center of the baffle plate 90, and the blades 91 terminate at the peripheral wall of the boss and are arranged radially when viewed from above.

Further, a pair of grooves 94 having a predetermined depth are formed in the upper surface of the boss 93 .

Reference numeral 95 denotes a donut-shaped burner disposed above the diaphragm plate 20, and its peripheral lower surface abuts against the open upper edge of the burner housing 12.

A large number of flame ports F are provided at this abutting position, that is, around the burner, and these flame ports are formed as follows.

That is, by integrally protruding a large number of comb-like pieces 14 above and below the horizontal annular part 96, it is formed between the comb-like pieces.

The outer surface of the comb-like piece 14 is perpendicular to the outer surface of the annular portion 96, and the upper and lower protruding positions are staggered.

That is, the burner ports F are opened in a vertical plane, and are arranged in multiple stages above and below, and the burner ports F do not coincide with each other at the top and bottom.

Reference numeral 97 designates an inverted conical head disposed above the burner 95, and a comb-like piece 14Q on the upper side of the burner 95 is provided around the upper surface.
A flange 98 that abuts on the upper surface is formed, and a cylindrical portion 99 is provided to protrude downward from the terminal end of the inverted conical surface, and a protruding piece that fits into the groove 94 of the diaphragm plate 20 is provided on the lower end surface of the protruding portion. 100 is integrally protruded, and a mounting hole 101 is formed through the center.

An attachment tapping screw 102 is pushed through the attachment hole from above, and its lower end threaded portion is forcibly screwed into a through hole 92 formed in a boss 93 of the aperture plate 20 and fixed thereto.

In this state, a small annular gap C is provided between the annular portion 96 of the burner 95 and the inner annular edge 103.

As described above, the burner head 13 is integrally connected to the burner housing 12, but at this time, the upper surface of the upper comb-like piece abuts the lower surface of the flange 98 of the head 97, and the lower comb-like piece The lower surface of the piece abuts against the open upper end surface of the burner housing 12, whereby the burner 95 is clamped, and the open surface above or below the gap between each comb-like piece 14 is closed, so that the burner 95 can be moved only in the horizontal direction. An open flame mouth is formed.

The groove 94 of the diaphragm plate 20 is used for attaching and removing the entire diaphragm plate to the burner casing 12 using a tool inserted into the groove, and also for positioning and rotating the head 97 by fitting the projecting piece 100 therein. It has a stopping role.

In the burner main body s connected in this way, there is a series of passages from the vaporizing chamber 11 through the gap 104 between the diaphragm plate 20, the lower burner port F and the gap G to the upper burner port F. It is formed.

R denotes a concave curved surface formed on the inner periphery of the bottom wall 27 of the vaporizing chamber 11, and 28 denotes an inner cylindrical part that extends downward beyond the bottom wall 27 of the burner housing 12 and has an open bottom surface. Part 29 is a heating element device inserted into this hakama part and bonded to the outer surface of the bottom wall 27, which includes a positive temperature coefficient thermistor 30, a terminal plate 31 bonded above and below this thermistor, and an insulating plate 32 bonded to the outside of this terminal plate. It consists of

Reference numeral 41 denotes a holding plate press-fitted into the skirt portion 28 from the outer surface of the lower insulating plate 32, thereby pressing the heating element device 29 into contact with the bottom wall 27.

Reference numeral 33 denotes a screw that is pushed through from the outer bottom surface of the heat shield tube I and has its threaded end portion screwed into the lower end of the skirt portion 28, thereby fixing the heat shield tube to the burner housing 12.

Reference numeral 34 denotes a bowl-shaped holding box that is loosely fitted into a through hole 35 formed at the center of the bottom of the heat shielding tube 7, and a plurality of locking pieces 36 horizontally protruding from the open periphery of the top surface are inserted into the inner bottom of the heat shielding tube 7. and is locked around the through hole 35.

Locking pieces 36 are installed in advance at multiple locations on the hole edge of the through hole 35 of the heat shield tube 7.
A notch (not shown) corresponding to the locking piece and through which the locking piece is pushed through is formed, and by slightly rotating the holding box 34 when the locking piece passes through the notch, the above-mentioned A lock is made.

Reference numeral 37 denotes a mounting screw that is pushed through from the central outer bottom of the holding box 34 and has its threaded end screwed into the holding plate 41, and its head 37A is long enough not to contact the outer bottom of the holding box 34.

Reference numeral 38 denotes a heat-sensitive thermistor whose central part is loosely fitted into the mounting screw 37 and whose upper surface is joined to the holding plate 41. When the temperature of the evaporation surface rises to a predetermined level, this heat-sensitive thermistor is sensed to turn on, for example, a lamp that has completed preheating. Alternatively, it has the effect of turning off the light to notify you.

Reference numeral 39 is a seat plate that is connected to the lower surface of the heat-sensitive thermistor 38, and its center portion is loosely fitted into the mounting screw 37.

49, this receiver is interposed between the seat plate 39 and the inner bottom of the holding box 34, and is compressed and springs, whereby the heating element device 29, the holding plate 41, and the heat-sensitive thermistor 38 are brought into close contact with each other, and the whole is attached to the burner housing 12. is pressed against the bottom wall 27 of.

Reference numeral 42 is a spacer that is attached so as to enclose the mounting screw 37, and has an upper end that hits the seat plate 39 and a lower end that hits the washer 43 fitted to the screw head 37A. This is done so that the screw head 37A does not come into contact with the outer bottom of the holding box 34.

The heat shield tube 1 has a nearly right cylindrical shape, and the diameter of the open top portion is slightly larger than the outer diameter of the burner casing in the facing position when it is fixed to the burner casing 12.

On the other hand, on the outer wall surface of the burner casing 12 facing upward from the heat shielding tube, vertical ribs 45 are integrally molded at multiple locations to protrude. It abuts against the shoulder 47 of the open upper end of the heat tube, and when the fixing screw 44 is screwed together, the hook 46 and the shoulder 47 abut, and the two casings 12 and 7 are joined together.

Therefore, the rib 45 protrudes from the outer wall surface of the burner housing 12 at the position of the open upper end of the heat shield tube 7, and the inner peripheral edge of the open upper end of the heat shield tube buttoned on the iron part has a diameter larger than the outer peripheral wall surface of the burner housing 12. As a result, a small gap 4 is inevitably created.
8 will be formed.

That is, the heat shield tube 7 and the burner casing 12 are connected to each other through small-area contact at a plurality of locations.

The open upper end of the heat shield tube 7 is further folded outward and downward to form a scrap part 47, and extends further horizontally from the folded end to form an annular 7-ramp part 49. .

Reference numeral 50 denotes a mounting portion formed by pushing upwardly a plurality of portions of the flange portion, and a mounting hole 51 is bored in the center of the mounting portion.

7 The lamp part 50 is brought into contact with the partition plate 8 of the stove body 1 at its lower surface, and at the same time, the shoulder part 47 of the heat shield tube 7, the upper part of the burner casing 12, and the burner head 13 protrude from the opening 52 formed in the partition plate 8. , and the burner head 13 part is trivet 2
Parts are exposed.

In this state, by passing the tapping screw 53 through the partition plate 8 and forcibly screwing it into the mounting hole 51 of the flange portion 49, the heat shield tube 7 is fixed to the partition plate 8, and thereby the burner body 3 is fixed and held. be done.

Reference numeral 54 denotes a nozzle body whose one end is connected to the burner housing 12, and is constructed as follows.

That is, 55 is a nozzle head which is fixedly screwed through the lower part of the side wall of the burner housing 12, with its tip facing the lower part of the vaporizing chamber 11, and whose diameter is gradually narrowed toward the tip in the axial direction of the central part. A through venturi hole 56 is formed.

Reference numeral 57 denotes a guide cylinder made of a thin metal plate that is fixedly connected to the outer circumferential wall of the rear end of the nozzle head 55, and has a substantially funnel-like shape whose diameter narrows toward the nozzle head 55.

A guide hole 64 for allowing the nozzle head to be pushed through when it is fixed to the burner housing 12 is formed in the side wall of the heat shield tube 7, and the heat shield tube I is inserted through the rear peripheral surface of the nozzle head 55. A space 55 between the burner housing 12 and the outer circumferential wall of the burner housing 12 communicates with the outside.

Since the burner housing 12 has a conical shape and the heat shield tube 7 has a substantially right cylindrical shape, this space has a shape that is wide at the bottom and narrows upward.

Reference numeral 66 denotes an annular flange extending outward from the rear end edge of the guide tube 57; 67 is pushed into the outer peripheral surface of the guide tube 57 from the tip thereof in advance to push the vertical surface portion 66 against the flange 66 of the guide tube 57; The heat dissipation flange 72 is a guide pipe whose one end is fitted into the guide tube 57 and fixed with adhesive, and the end of the blower pipe 10 is attached to the other end. connected.

Reference numeral 73 denotes an introduction tube that is integrally provided on the outer wall of this guide tube and has a female threaded portion 74 formed on its inner surface, into which the end of the liquid supply pipe 75 led out from the liquid level regulator 6 is screwed. It is worn.

76 is a small-diameter liquid sending pipe that is formed integrally with the introduction tube 73, projects vertically at the internal axis position 1 of the guide tube 72, and is bent along the axis in the direction of the nozzle head 55, and is hollow inside. It communicates with the liquid supply pipe 75 via the introduction tube γ3.

Reference numeral 77 designates a two-dollar nozzle that extends from the tip of the liquid feeding pipe 76 and whose tip opens into the vaporization chamber 11 through the center of the venturi hole 56 of the nozzle head 55. It has a hollow hole and communicates with the liquid sending pipe.

The tip 70 of the needle nozzle 77 is cut diagonally, and this tip faces the vicinity where the venturi hole 56 of the nozzle head 55 opens into the vaporization chamber 11.

In the above configuration, when the positive temperature coefficient thermistor 30 is energized in advance, the burner casing 12 is heated by the heat generated.
The vaporization wall 25 is heated by heat transfer, and the temperature of the vaporization wall surface is kept constant due to the characteristics of the samister.

Due to a change in the resistance value of the heat-sensitive thermistor 38 which correlates with the predetermined temperature of the vaporization wall 25, the lamp circuit becomes non-conductive and the lamp that was previously lit goes out.

When this lamp is confirmed to be off and the blower 9 is operated, the air flows through the air pipe 10, the guide pipe T2, and the guide tube 57, reaches the venturi hole 56, and becomes a high-speed air flow due to the venturi action of the venturi hole and is vaporized. The air is blown into the chamber 11.

At this time, the pressure at the core becomes small due to the Venturi action, so the fuel from the constant liquid level device 6 is sucked from the tip of the needle nozzle 77 and is injected into the vaporization chamber 11 in the form of fine particles along with the high-speed air flow. , 11 collides with the vaporization wall 25 at extremely high speed.

The collided fuel particles are heated and vaporized on the vaporization wall 25, become a premixture of molecular fuel and air, and rise as a mixture of gas and liquid in the main vaporization chamber A, and reach the aperture plate 20. Once reached, this premixture is focused and ejected upward from the diaphragm 9024, where it is diffused and further mixed with gas and liquid until it reaches the gap G.
The flame reaches the flame opening F, where it is ignited by the ignition means 84 and burns continuously.

This combustion is carried out in two stages, upper and lower, and although it is a small-diameter burner, there are many flame holes F, and the amount of combustion remains constant, and the hot air from the combustion on the upper side is synergized by that on the lower side. In addition to being heated up, the hot air is strong, and by increasing the number of flame ports, the combustion noise is also low.

Furthermore, the staggered arrangement prevents the combustion flames from overlapping, resulting in a highly efficient flame.

Fuel is supplied according to the so-called Bernoulli's law by the air flow supplied to the nozzle head 55 in this way, so the air flow rate and the fuel amount are approximately proportional, so when changing the combustion amount, the control pulp 85 You can easily change the fuel flow rate by simply changing the air flow rate.

This provides the characteristic that the premix ratio of air and fuel remains approximately constant even if the combustion amount is changed.

The fuel that collides with the vaporization wall 25 is spread thinly on the vaporization wall soil, and the entire fuel particle is rapidly heated and vaporized by the heat of the vaporization wall 25, and the air jet forms a dog with a very high velocity gradient above the fuel particle. In order to form a flow, the fuel particles are not only spread thinner, but also the fuel molecules are rapidly carried away, and the fuel diffusion layer formed on the vaporization wall 25 becomes extremely thin.

Since the vaporization wall 25 becomes wider as it goes upward, and the diameter of the vaporization chamber 11 gradually increases from the bottom diameter to the top diameter, the fuel molecules are absorbed by the airflow on the sloped vaporization wall surface. The diffusion layer is forced upward along the direction of the diffusion layer, thereby effectively preventing the formation of the diffusion layer.

The concave curved surface R of the inner bottom periphery of the vaporization chamber 11 also has the effect of spreading the fuel particles thinly and facilitating vaporization, as described above.
This prevents fuel from accumulating and condensing on the inner bottom periphery.

On the other hand, the air-fuel mixture from the gap 104 to the upper part of the diaphragm plate 20 via the diaphragm plate 20 is turned into a swirling flow by the vanes 91, which further promotes mixing and stabilizes combustion at the flame port F.

One embodiment of the present invention has been described in detail above, but in short, this invention is a vaporizer in which fuel is mixed and injected with air into a vaporization chamber, vaporized in the vaporization chamber, and then combusted at an upper flame opening. The burner is particularly characterized in that the burner is clamped and fixed between the vaporization chamber and the head, thereby making it possible to easily assemble a compact burner.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a stove equipped with a burner according to the present invention, FIG. 2 is an enlarged sectional view of the burner portion, and FIG. 3 is an exploded perspective view of the burner head. 3 is the burner body, 11 is the vaporization chamber, 12 is the burner housing, 13
is the burner head, F is the flame port, 20 is the aperture plate) 24 is the aperture port, 25 is the vaporization wall, 54 is the nozzle body, 95 is the burner,
97 is a head, and 102 is a screw.

Claims (1)

[Claims] 1 A device that has a vaporization chamber whose wall is heated by a heating means, and injects liquid fuel together with air into the chamber to mix gas and liquid, vaporize it, and then combust it at the flame opening above the vaporization chamber. In this case, the upper surface of the vaporization chamber is open, and the outer peripheral part of a throttle plate having a throttle opening in the center is screwed and fixed to the inner circumferential wall on the open side. An annular burner having a mouth is polymerized by abutting the lower surface of its lower burner against the open upper end surface of the vaporizing chamber,
Further, on the upper side of this burner, a head having a mounting hole in the center is superimposed so that the lower surface of its periphery abuts the upper surface of the upper burner port, and the tip of the screw is pushed through the mounting hole. A liquid fuel vaporizing burner characterized in that the burner is clamped and fixed between the vaporizing chamber open upper end surface and the periphery of the head by screwing the part into a part of the aperture plate.