JPS5838257Y2 - Liquid fuel vaporization burner - Google Patents

Description

[Detailed description of the invention] This invention relates to a burner that vaporizes and burns liquid fuel such as kerosene, and aims to improve the combustion effect.

This invention will be explained below based on an illustrated embodiment in which this invention is applied to an oil stove.

Figure 1 shows a stove equipped with a burner according to this invention, where the burner body 3 corresponds to the trivet 2 placed on the top of the 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 casing 12 with an open top and a top surface of the burner casing. It is separated from the fixed burner head 13, and the burner head is fixed to the burner housing 12 in the following manner.

That is, 20 is a dish-shaped aperture plate, and a threaded portion 22 is formed on the outer surface of an annular peripheral edge 21 raised upward, and this male threaded portion is formed on the inner circumferential surface of the upper end of the burner housing 12. By screwing into the portion 26, the throttle plate 21 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 boss 93 from the upper surface thereof.

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 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 96. 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 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, an unspecified 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 connected to the burner housing 12.

The groove 94 of the diaphragm plate 20 is used to attach and detach the entire diaphragm plate to and from the burner casing 12 using a tool inserted into this groove, and also positions and prevents the head 97 from rotating by fitting the protrusion 100 therein. It has a role.

In the burner main body 3 connected in this way, a series of passages are formed from the vaporization chamber 11 through the gap 104 of the throttle plate 20 to the upper flame outlet F via the lower flame outlet F and the gap G. be done.

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.

Numeral 33 is a screw inserted from the outer bottom surface of the heat shielding case 7 and having a threaded end portion screwed into the lower end of the skirt portion 28, thereby fixing the heat shielding case to the burner case 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 locked around the through hole 35 at.

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 that is inserted through the central outer bottom of the holding box 34 and has a threaded tip end screwed into the holding plate 41, and its head 37A has a length that does not touch 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 allows the heating element device 29, the holding plate 41, and the heat-sensitive thermistor 38 to be brought into close contact with each other, and the whole of these is attached to the burner housing 12. It is pressed against the bottom wall 27.

Reference numeral 42 is a spacer that is attached to contain 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 head 37A is configured so as not to come into contact with the outer bottom of the holding box 34.

The heat shielding case 7 has a substantially right cylindrical shape, and the diameter of the open top portion is slightly larger than the outer diameter of the burner case at the position facing the burner case 12 when the heat shield case 7 is fixed to the burner case 12.

On the other hand, on the outer wall surface of the burner housing 12 above the heat shielding housing, longitudinal ribs 45 are integrally formed to protrude at a plurality of locations, and the lower end hooks 46 of these ribs open the upper end of the heat shielding housing, which will be described later. When the fixing screw 44 is screwed together, the hook portion 46 and the shoulder portion 47 abut against each other, and both the 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 housing 7, and the inner peripheral edge of the open upper end of the heat shield housing in 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.

In other words, the heat shielding case 7 and the burner case 12 are connected to each other through small-area contact at a plurality of locations.

The open upper end of the heat insulating casing 7 is further folded outward and downward to form a shoulder 47, and extends horizontally from the folded end to form an annular flange 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 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 shielding case 7, the upper part of the burner case 12, and the burner head 13 protrude from the opening 52 formed in the partition plate 8. , and 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.

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 that is screwed and fixed to the lower part of the side wall of the burner housing 12 and has its tip facing the inner lower part of the vaporization chamber 11, and the diameter of the nozzle head 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 insertion of the nozzle head when it is fixed to the burner housing 12 is formed in the side wall of the heat shield housing 7, and a guide hole 64 is formed in the side wall of the heat shield housing 7 to allow the nozzle head to pass through the heat shield housing through the rear peripheral surface of the nozzle head 55. 7 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 housing 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 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 dimpled portion 74 formed on its inner surface. It is screwed on.

76 is a small-diameter liquid sending pipe that is formed integrally with the introduction tube 73, projects vertically to the internal axis 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 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 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.

After confirming that this lamp is off, when the blower 9 is operated, the air flows through the air pipe 10, the guide pipe 72, and the guide tube 57, and reaches the venturi (L56). It is blown into 11.

At this time, the pressure in the iron part becomes small due to the Venturi action, so the fuel from the leveling device 6 is sucked from the tip of the needle nozzle 77 and is injected into the vaporization chamber 11 as fine particles along with the high-speed air flow. , 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, mix gas and liquid in the main vaporization chamber A, rise, and reach the aperture plate 20. - It is concentrated and ejected upward from the aperture 24.

This premixture is diffused, further mixed with gas and liquid, and reaches the flame port F through the gap G, 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, a large number of flame ports F are obtained, and the combustion amount is as large as possible, and the hot combustion air on the upper side is synergistically absorbed by that on the lower side. The heated air is strong, and by increasing the number of flame openings, 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 flows over the fuel particle with an extremely large velocity gradient. 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 is gradually larger 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.
Fuel is prevented from accumulating and solidifying 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.

One embodiment of this invention has been described in detail above, and this invention particularly has a hakama part 28 protruding from the lower part of the burner housing 12, and a heating element device 29 is contained in this hakama part, so that heat dissipation is suppressed. The holding plate 41 is press-fitted into the skirt part 28 to completely close the heating element device 29, and at the same time is brought into pressure contact with the outer bottom of the burner casing 12, so that heat is effectively transferred to the burner casing, in other words, to the vaporization chamber 11. The gas is transmitted and the fuel is effectively gasified.

In addition, since the mounting screw 37 is screwed into the retaining plate 41 and the heat-sensitive thermistor 38 is fitted to this mounting screw, the position can be easily regulated and mounted, and the heat-sensitive thermistor 38
is pressed against the retaining plate 41 by the compression spring 40, so that the heat-sensitive thermistor 38 is securely mounted.Moreover, the compression spring presses the retaining plate 41 more toward the heating element 29, improving heat transfer and preventing rattling. will be further resolved.

The heat-sensitive thermistor 38 is also always in close contact with the holding plate 41 in a fixed position to ensure heat-sensitive operation, thereby stabilizing the performance of each part and providing a burner with improved combustion effects.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a stove equipped with a burner according to this 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, 7 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,
21 is a heating element device, 25 is a vaporization wall, 37 is an attachment unit,
38 is a heat sensitive thermistor, 40 is a compression spring, and 41 is a holding plate 5

Claims (1)

[Scope of utility model registration request] A burner housing having a vaporizing chamber heated by a heating element device disposed on the outer bottom, and a heat shielding housing housing and fixing the burner housing are provided, and liquid fuel is injected together with air into the vaporizing chamber to mix gas and liquid. After vaporization, the burner is burned at a flame port formed above the vaporization chamber, in which a cylindrical hakama part containing a heating element device is provided protruding from the bottom of the burner housing, and the heating element device is housed within this hakama part. A holding plate is press-fitted from the outside so that this heating element device is brought into pressure contact with the bottom surface of the burner housing, and a heat-sensitive thermistor that indirectly senses a predetermined temperature in the vaporization chamber and controls a predetermined circuit is bonded to the outer surface of this holding plate. , and the threaded end of the mounting screw inserted through the heat-sensitive thermistor from the outside of the bottom of the heat-insulating case is screwed into the holding plate, and the heat-sensitive thermistor is inserted between the heat-sensitive thermistor and the bottom of the heat-insulating case on the holding plate side. A liquid fuel vaporizing burner that is equipped with a compression spring that presses the liquid fuel.