JPS5856046B2 - 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 is a burner body 3. A heat shielding case 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 acid 12 with an open upper surface and a burner head 13 placed and fixed on the upper surface of the burner acid. It is defined as burnic acid 12.

That is, 20 is a saucer-shaped aperture plate, and a threaded portion 22 is formed on the outer surface of an annular peripheral edge 21 that rises upward, and this button threaded portion is formed on the inner peripheral surface of the upper end of the burnic acid 12. By screwing into the portion 25, the aperture plate 20 is fixed to the burnic acid 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, terminates in the peripheral wall of the boss of the blade 91, and is arranged radially when viewed from the top.

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

Reference numeral 95 denotes a donut-shaped burner disposed above the diaphragm plate 20, and the lower surface of the periphery thereof abuts against the open upper edge of the burner acid 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 blade-like pieces 14 above and below the horizontal annular part 96, it is formed between the comb-blade-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 denotes an inverted conical head disposed above the burner 95, and a flange 98 is formed around the upper surface to abut against the upper surface of the comb blade-like piece 14 on the upper side of the burner 95. A cylindrical portion 99 is provided to protrude downward from the cylindrical portion, and a protruding piece 100 that fits into the groove 94 of the aperture plate 20 is integrally protruded from the lower end surface of the protruding portion, and a mounting hole 101 is formed through the center. ing.

A mounting tapping screw 102 is inserted into this mounting 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 G 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 combined with the burnic acid 12.

Thus, the groove 94 of the aperture plate 20 is used to attach and detach the entire aperture plate to the burnic acid 12 using a tool inserted into this groove, and the head 97 is positioned and prevented from rotating by fitting the protrusion 100 therein. It has a role.

Inside the burner body 3 combined in this way, there is a series of passages from the vaporizing chamber 11 through the gap 104 of the throttle plate 20 to the lower burner port F and the upper burner port F via the gap G. is formed.

R is a concave curved surface formed on the inner periphery of the bottom wall 27 of the vaporization chamber 11, and 28 is an inner cylindrical hakama with the lower part of the burnic acid 12 extending downward beyond the bottom wall 27 and whose lower surface is open. 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.

A screw 33 is inserted through the outer bottom surface of the heat shielding case 7 and has its threaded end screwed into the lower end of the skirt part 28, thereby fixing the heat shielding case to the burnic acid 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 case 7, and a plurality of locking pieces 36 horizontally protruding from the open periphery of the top surface are attached to the inner bottom of the heat shielding case 7. It is now locked around the through hole 35.

Locking pieces 36 are provided in advance at multiple locations on the edge of the through hole 35 of the heat shielding case 7.
A notch (not shown) is formed corresponding to the locking piece and through which the locking piece is inserted, and when the locking piece passes through the notch, by slightly rotating the holding box 34, the locking piece is inserted. A stop occurs.

Reference numeral 37 denotes a mounting screw which is inserted through 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 denotes 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.

Reference numeral 40 denotes a compression spring interposed between the seat plate 39 and the inner bottom of the holding box 34, which causes the heating element device 29, the holding plate 41, and the heat-sensitive thermistor 38 to come into close contact with each other, and the entirety of these is covered with burnic acid 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. The portion 37A is configured so as not to come into contact with the outer bottom portion of the holding box 34.

The heat shielding case 7 has a nearly right cylindrical shape, and the diameter of the open portion of the upper surface is slightly larger than the outer diameter of the burnic acid 12 that is applied to the position facing the burnic acid 12 when the heat shielding case 7 is fixed to the burnic acid 12.

On the other hand, on the outer wall surface of the burner acid 12 above the heat shielding case, longitudinal ribs 45 are integrally molded to protrude at a plurality of locations, and the lower end hooks 46 of these ribs are used as shields as described below. It abuts against the shoulder 47 of the open upper end of the thermal casing, 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 burnic acid 12 which is buttoned at the upper end open part position of the heat shielding case 7, and the inner peripheral edge of the upper end open part of the heat shielding case which is buttoned at the core is the outer peripheral wall surface of the burnic acid 12. Due to the larger diameter, a small gap 4 is inevitably created.
8 will be formed.

That is, the heat shielding case 7 and the burnic acid 12 are connected to each other by buttons at a plurality of locations and through contact over a small area.

The open upper end of the shielding wall housing 7 is further folded outward and downward to form a shoulder portion 47, and this folded end is further extended horizontally to form an annular flange portion 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.

The flange portion 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 portion 47 of the heat shielding case 7, the upper portion of the burner acid 12, and the burner hend 13 protrude from the opening 52 formed in the partition plate 8. Moreover, the burner head 13 portion is exposed to the trivet 2 portion.

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 shielding case 7 is fixed to the partition plate 8, and thereby the burner body 3 is fixed. Retained.

The nozzle body has the end portion of the nozzle 54 connected to the vernic acid 12, and is constructed as follows.

That is, 55 is a nozzle head which is screwed and fixed to the lower part of the side wall of the burnic acid 12 and whose tip faces 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 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 insertion of the nozzle head when it is fixed to the burnic acid 12 is formed in the side wall of the heat shielding case 7, and the guide hole 64 is formed in the side wall of the heat shielding case 7 through the rear peripheral surface of the nozzle head 55. 7 and the outer peripheral wall of the burner housing 12 communicates with the outside.

Since the burnic acid 12 has a conical shape and the heat shielding case 7 has a substantially right cylindrical shape, this space has a shape that is wide at the bottom and narrows upward.

66 is an annular flange extending outward from the rear end edge of the guide tube 57; 67 is inserted into the outer circumferential surface of the guide tube 57 from the tip thereof in advance to push the vertical surface 66 against the flange 66 of the guide tube 57; The heat dissipation flange 72 is a heat dissipation flange 72 which is fixed with adhesive or welding when the two are put together, and is a conduit with one end inside the guide tube 57 and fixed with adhesive, and the other end with the end of the blower pipe 10. 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, protrudes vertically at the internal axis position 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 a liquid supply pipe 75 via an introduction tube 73.

A needle nozzle 77 extends from the tip of the liquid feeding pipe 76 and has its tip opening 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 701/'i of the needle nozzle 71 is cut obliquely, and this tip faces the vicinity where the venturi hole 56 of the nozzle head 55 opens into the vaporization chamber 11.

When the above configuration is clicked and the positive temperature coefficient thermistor 30 is energized and peeled off, the burnic acid 12 is heated by the heat generated.
The vaporization wall 25 is heated by heating, and the temperature of the vaporization wall surface is kept constant due to the characteristics of the thermistor.

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 turned off and the blower 9 is operated, the air flows through the air pipe 10, the guide pipe 12, 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 through the needle nozzle 77 %J, becomes fine particles together with the high-speed air flow, and is injected into the vaporization chamber 11. and collides with the IT 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, mix gas and liquid in the main vaporization chamber A, rise, and reach the aperture plate 20. Once reached, it is focused and ejected upward from the aperture 24.

This premixture is diffused and further mixed with gas and liquid in the gap G.
The flame reaches the flame opening F, where it is ignited by the ignition means 84 and burns continuously.

Such combustion is carried out in two stages, upper and lower, and although there are small diameter burners, there are many flame ports F, and the combustion amount is as small as possible, and the hot air of combustion in the upper part is synergistically generated by that in the lower part. It is heated and the hot air is strong, and by increasing the number of flame ports, the combustion sound 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 flow rate are approximately proportional, so when changing the combustion amount, the control valve 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 gradually increases in diameter from the bottom diameter to the top diameter of the vaporization chamber 11 so that it becomes wider as it goes upward, the fuel molecules are moved along the sloped vaporization wall surface by the air flow. It is biased upward and helps in effectively forming 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 mixture flowing from the gap 104 through the aperture port 24 and above the aperture plate 20 is turned into a swirling flow by the blades 91, which further promotes mixing and stabilizes combustion at the flame port F.

In particular, this invention provides a hakama part 28 at the lower part of the burnic acid 12 and encloses a heating element device 29 in this hakama part, so that heat dissipation is suppressed. At the same time as the device is completely closed, the retaining plate 41 is pressed against the outer bottom of the burnic acid 12 and the compression spring 40 interposed between it and the bottom of the heat shielding box 7 presses the holding plate 41 toward the heating element device, so that heat is effective. In other words, the fuel is transmitted to the vaporization chamber to effectively gasify the fuel, and the heat-sensitive thermistor is brought into close contact with the holding plate in order to sense the temperature of the vaporization surface using the compression spring. Since the installation is easy and there is no rattling in each part, stable performance is maintained and a burner with improved combustion effects can be provided.

[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, 1 is the heat shielding case, 11 is the vaporization chamber, 12 is the burner case, 13 is the burner head, F is the flame mouth, 28 is the hakama part,
29 is a heating element device, 25 is a vaporization wall, 40 is a compression spring, 41 is a holding plate, and 54 is a nozzle body.

Claims (1)

[Claims] 1. A burner acid having a vaporization chamber heated by a heating element device arranged on the outer bottom, and a heat shielding case that houses and fixes the burna acid, and liquid fuel is injected together with air into the vaporization chamber to mix gas and liquid. After the burner acid is vaporized, it is burned at the flame opening above the vaporization chamber.A cylindrical hakama part containing the heating element device is provided protruding from the lower surface of the burner acid, and inside this hakama part, A holding plate is press-fitted so that the heating element device is brought into pressure contact with the bottom wall of the burner acid from the outside, and a compression spring is provided between the holding plate and the bottom surface of the heat shielding case to press the holding plate toward the heating element device side. A liquid fuel vaporizing type in which a heat-sensitive thermistor for sensing the temperature of the vaporizing surface is closely attached to the holding plate by means of this compression spring.