KR100869503B1 - Gas combustion apparatus for dryer - Google Patents

Abstract

According to the present invention, in the gas combustion apparatus of a dryer, the flame generated during combustion is diverged and the inflow of secondary air into the flame is increased to shorten the length of the flame and to ensure the stability of the flame.

To this end, the gas combustion device of the present invention is provided with a gas nozzle for supplying and injecting gas, a mixing tube for mixing gas and primary air injected from the gas nozzle, and is installed on the outlet side of the mixing tube and the mixing tube An ignition device for igniting the gas mixed with the primary air exiting through the outlet of the flame, and the flame holder is provided on the outlet side of the mixing tube and the flame hole to be burned by the gas is mixed with the primary air is blown apart It is configured by.

Dryer, gas, combustion, flame

Description

Gas combustion apparatus for dryer

1 is an exploded perspective view showing the main configuration of the dryer according to the prior art.

Figure 2 is a plan view showing the configuration of a gas combustion device for a dryer according to the prior art.

3 is an explanatory diagram for explaining a problem of a gas combustion device for a dryer according to the prior art;

Figure 4 is an exploded perspective view showing an embodiment configuration of a gas combustion device for a dryer according to the present invention.

5 is a perspective view of the mixing pipe exit side in the direction A of FIG.

Explanation of symbols on the main parts of the drawings

22: gas nozzle 23: gas pipe

24: mixing tube 240: mixing euro

50: ignition device 660: flame holder

661: vertical plane 662: circular flame

663: side wall surface 664: horizontal surface

665: support

The present invention relates to a dryer, and more particularly, to a gas combustion apparatus for producing hot air by burning a gas so as to dry the dried matter put into a drum.

1 is an exploded perspective view showing a main configuration of a dryer according to the prior art. According to this, the drum 1 is installed inside a cabinet (not shown) constituting the exterior of the dryer. The drum 1 is formed in a cylindrical shape so that the front and rear sides are opened, and a belt groove 2 around which a belt (not shown) driven by a separate driving source is wound.

A drying chamber 5, which is a space in which drying proceeds, is formed in the drum 1, and inside the drum 1, the object to be dried in the drying chamber 5 is pulled up when the drum 1 is rotated. A plurality of lifters 6 are formed to invert the object to be dried, thereby increasing the drying efficiency.

The front supporter 7 and the rear supporter 9 are provided to correspond to the front end and the rear end of the drum 1, respectively. Here, the front supporter 7 and the rear supporter 9 serve to block the front and rear of the drum 1 to form a drying chamber 5 and to support the front and rear ends of the drum 1, respectively. .

At this time, a sealing member 10 is installed between the front supporter 7 and the rotating drum 1 and between the rear supporter 9 and the rotating drum 1 to prevent leakage. 7 and the rear supporter 9 are provided with a plurality of rollers (not shown) for supporting the drum 1 at corresponding positions at the front and rear of the drum 1, respectively.

On the other hand, the front supporter (7) is formed with a through hole (8) for communicating the drying chamber 5 and the outside. The through hole 8 is selectively opened and closed by a door (not shown).

In addition, a hot air supply duct 12 is installed in the rear supporter 9, and the hot air supply duct 12 serves as a passage for supplying hot air to the drying chamber 5. In communication with

In addition, one side of the front supporter 7 corresponding to the lower end of the through hole 8 of the front supporter 7 is provided with an outlet assembly 13 which is a portion through which the air escapes from the drying chamber 5. In addition, the outlet assembly 13 is provided with a lint filter 14.

The lint filter 14 serves to filter foreign matter (for example, seams or dust) mixed in the air exiting the drying chamber 5.

On the other hand, the lint duct 15 is installed in communication with the outlet assembly 13, the lint filter 14 is located to the interior of the lint duct 15. A blower 17 is installed to be connected to the lint duct 15 to suck air from the drying chamber 5 through the lint duct 15. The blower 17 is installed inside the blower housing 18.

One side of the blower housing 18 communicates with the lint duct 15, and an exhaust pipe 19 is connected to the other side. Therefore, the air exiting the drying chamber 5 and passing through the lint duct 15 is discharged to the outside through the exhaust pipe 19 by the blowing action of the blower 17.

On the other hand, the guide funnel 20 (Guide funnel) is connected to the inlet side of the hot air supply duct (12). The guide funnel 20 serves to guide the hot air generated by the combustion of the gas to the inlet side of the hot air supply duct.

At the inlet side of the guide funnel 20, a mixing tube 24 for mixing the gas injected from the gas nozzle 22 and the primary air is installed.

At this time, the outlet portion of the mixing tube 24 is installed to be positioned in a state where a predetermined distance from the inlet of the guide funnel 20.

In addition, the gas nozzle 22 is installed to correspond to the inlet of the mixing tube 24, and the gas nozzle 22 is connected to a valve 30 for controlling gas supply and supply amount.

The valve 30 is connected to the gas pipe 23 so that the gas can be continuously supplied from a separate gas supply source.

Accordingly, the gas injected from the gas nozzle 22 and the external air introduced through the inlet of the mixing tube 24, that is, the primary air, are mixed in the mixing tube 24.

The spark plug 26 is installed at the tip of the mixing tube 24 to generate spark for ignition.

It explains that the dryer according to the prior art having such a configuration is operated.

After putting an object to be dried (eg, laundry cloth) into the drying chamber 5 formed in the drum 1 and closing the door, pressing the operation button causes the belt wound around the belt groove 2 to be driven to a separate driving source. The drum 1 is rotated while being driven.

Then, the blower 17 is operated to suck the air of the drying chamber 5 through the lint duct 15. In this case, external air is introduced into the drying chamber 5 through the hot air supply duct 12 due to the pressure difference.

At this time, the air supplied to the hot air supply duct 12 is heated by a gas combustion device to enter a relatively high temperature state.

That is, gas is injected into the mixing tube 24 through the gas nozzle 22, and primary air flows into the inlet of the mixing tube 24, and the gas is mixed with the gas in the mixing tube 24. The primary air is mixed and is first ignited and burned by the spark plug 26 at the outlet of the mixing tube 24. As such, the heat energy generated by the combustion of the gas heats the air introduced into the guide funnel 20 to produce hot air.

On the other hand, the hot air flows into the drying chamber 5 formed inside the drum 1 through the hot air supply duct 12. Then, the hot air in the drying chamber 5 absorbs the moisture contained in the laundry cloth, and then exits the drying chamber 5 through the outlet assembly 13. At this time, the air exiting from the drying chamber 5 through the outlet assembly 13 is made by the suction force of the blower 17. And foreign matter such as dust or seams contained in the air exiting the outlet assembly 13 is filtered while passing through the lint filter (14).

However, the prior art having the configuration as described above has the following problems.

That is, the outlet of the mixing tube 24 is formed in a single flow path having a circular cross section so that the combustion flame combusted at the outlet of the mixing tube 24 forms one large and long flame as shown in FIG. do. At this time, the flame may vary in size, length, and formation position depending on conditions such as the number of revolutions of the blower or exhaust resistance.

For example, if the number of revolutions of the blower 17 is appropriate, the flame F is formed near the outlet of the mixing tube 24 as indicated by the solid line, but if the number of revolutions of the blower 17 is too high, it is indicated by a dotted line in FIG. As described above, a lifting phenomenon in which the flame F is formed at a point too far from the outlet of the mixing tube 24 (indicated by “l” in the drawing) occurs.

And if the rotation speed of the blower 17 is too low, the flame length will become very long. In this case, there was a problem in that the hot air supply duct is overheated by the flame invading the hot wind supply duct, and in severe cases, the flame invaded the drying chamber 5 and thus the risk of fire.

In other words, when the external conditions such as the rotation speed of the blower is not appropriate, the balance between the combustion speed of the gas and the inflowing air is broken and a lifting phenomenon occurs or the flame is excessively long and the flame invades the drum. There was a problem.                         

In addition, in the prior art, the gas mixed with the primary air during initial ignition immediately exits the outlet of the mixing tube 24, which has a disadvantage in that the initial ignition force is lowered.

On the other hand, since the outlet of the mixing tube 24 is formed in a single flow path having a circular cross section, the flame (F) forms a lump as a whole. This reduces the contact area between the flame (F) and the secondary air.

That is, when a flame becomes a mass, the contact area with the secondary air is reduced as a whole. Accordingly, incomplete combustion occurs due to the lack of air for combustion in the flame, and this also causes a length of the flame. Will work.

In addition, if the supply of secondary air to the flame (F) is not smoothly made as described above, not only the flame is long, but also the flame state becomes sulfur salt and combustion is incomplete, soot or harmful. It generates a large amount of gases (CO, NO _X , SO _X ).

The present invention is to solve all the problems of the prior art as described above, in the gas combustion device of the dryer, it is possible to improve the ignition characteristics by improving the initial ignition force.

Another object of the present invention is to improve the flame characteristics so that the flame is formed stably by shortening the length of the flame generated during gas combustion and increasing the inflow of the secondary air.

According to a feature of the present invention for achieving the above object, a gas combustion device is a gas nozzle for supplying and injecting gas, a mixing tube for mixing the gas and primary air injected from the gas nozzle, and the mixing An ignition device installed at the outlet side of the tube to ignite the gas mixed with the primary air exiting through the outlet of the mixing tube, and the gas mixed at the outlet side of the mixing tube and mixed with the primary air is blown out by burning. It is configured to include a flame holder having a salt hole to be.

The flame holder is a "b" shaped plate structure consisting of a vertical plane and a horizontal plane, a circular flame hole is provided in the center of the vertical plane, side edges of the vertical plane is provided with a side wall surface having a width toward the rear of the holder.

At this time, the side wall surface provided at both edges of the vertical plane of the flame holder is formed by cutting a predetermined portion of both edges of the corner where the vertical plane and the horizontal plane meet and bend backward.

On the other hand, the flame holder is installed to be located in front of the mixing tube outlet as the support portion extending from one side of the horizontal plane is fixed to the mixing tube outlet side.

Drying gas combustion device according to the present invention having such a configuration is the initial ignition power is improved, the overall length of the flame is shortened, a larger amount of secondary air flows into the flame, the flame is stable and high temperature There is an advantage to achieve blue salts.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the gas combustion device for a dryer according to the present invention as described above will be described in detail. The same as in the prior art will be described using the symbols in the prior art drawings.

Figure 4 is an exploded perspective view showing the configuration of a preferred embodiment of a gas combustion device for a dryer according to the present invention, Figure 5 is a perspective view of the mixer outlet side viewed from the A direction of FIG.

As shown, a gas pipe 32 for supplying gas is connected to the gas nozzle 22 through which gas for combustion is injected. The gas nozzle 22 is provided with a valve 30 for controlling the injection of the gas delivered through the gas pipe 32 and the injection amount during the injection.

The mixing tube 24 is installed in front of the gas nozzle 22. The mixing passage 24 is provided in the mixing tube 24 for mixing the gas injected from the gas nozzle 22 with the primary air. The mixing tube 24 is designed so that the passage cross-sectional area becomes narrow and gradually widens from the inlet side to the outlet side. The gas injected from the gas nozzle 22 is introduced into the mixing tube 24 together with the primary air.

At the outlet side of the mixing tube 24, an ignition device 50 for igniting the gas exiting the mixing passage 240 of the mixing tube 24 is installed, so as to be attached to the mixing tube 24 or separately supported. Is installed.

At this time, the ignition device 50 is heated as an electric current is applied as a ceramic material and mixed with the primary air to ignite the discharged gas.

And, the flame holder 660 is installed in front of the outlet of the mixing tube (24). The flame holder 660 is provided with a circular flame hole 662 at the center thereof, and a vertical surface 661 having a side wall surface 663 having a width at both edges toward the holder rearward and perpendicular to the vertical surface 661. The horizontal surface 664 extends rearward from the top of the vertical surface 661.

That is, the flame holder 660 is a "b" shaped plate structure, the circular flame hole 662 on the vertical surface 661 and the vertical surface 661 both the side and the lower side to serve to form a flame formed in four directions Will be

Here, the side wall surface 663 provided at both edges of the vertical surface 661 of the flame holder 660 cuts a predetermined portion of both edges of the corner where the vertical surface 661 and the horizontal surface 664 meet and bends backwards. Formed accordingly.

On the other hand, the flame holder 660 is located at a predetermined distance spaced in front of the outlet of the mixing tube as the support 665 extending from the rear end of the horizontal surface 664 is fixed to the outlet of the mixing tube 24.

Here, it is preferable that the area ratio of the circular salt hole 662 and the area ratio of the vertical surface 661 are set by experiment.

The flame holder 660 acts to cause combustion by ejecting the gas mixed with the primary air that has passed through the mixing channel 240, and the circular flame hole 662 and the vertical plane 661 at the center of the vertical plane 661. The gas is separated from the lower side and outside the side wall surface 663, and the mixed gas (i.e., gas mixed with the primary air) is ejected and the mixed gas is ignited to form a main flame.                     

At this time, according to the present invention, the amount of the mixed gas that stays behind and exits the surface of the flame holder 660 at the time of initial ignition is increased by increasing the amount of mixed gas remaining behind the surface, and instead, the initial ignition force is improved.

In addition, according to the present invention, the main flame is divided into a plurality of flame holders 660 having a vertical surface 664 having a circular flame hole 662 formed in the center thereof, thereby expanding the surface area of the flame as a whole. Inflow is more smooth.

On the other hand, the mixing tube 24 is installed to be inclined at a predetermined angle upward toward the outlet side, so that the tube axis direction of the mixing tube is naturally matched with the direction of the flame.

Hereinafter, the operation of the present invention having the configuration as described above. This will be described with reference to the embodiments shown in FIGS. 4 and 5.

In order to proceed with the drying process in the dryer, as the gas is combusted, the temperature of the air entering the drying chamber 5 must be increased. To this end, the gas for combustion is injected into the mixing tube 24 through the gas nozzle 22.

In addition, primary air is introduced into the mixing tube 24 together with the gas.

Accordingly, the gas and the primary air flow along the inner flow path of the mixing tube 24.

Subsequently, the gas mixed with the primary air while flowing along the inner flow path of the mixing tube 24 (that is, the mixed gas) is a circular salt hole of the flame holder 660 installed at the outlet side of the mixing tube 24. 662 and the horizontal plane left and right, and through the horizontal plane lower side is ejected. The mixed gas ejected as described above is ignited by receiving heat from the ignition device 50 provided around the flame holder 660.

Thereafter, the mixed gas is continuously ejected through the circular flame hole 662 and the horizontal plane left and right and the horizontal plane lower side of the flame holder 660, the combustion is made to continuously generate the hot air for drying.

As a result, the overall length of the flame is shortened, but the contact area with the secondary air is expanded.

That is, as the mixed gas discharged through the outlet side of the mixing tube 24 is ejected into four places by the horizontal plane in which the circular flame hole 662 of the flame holder 660 is formed, the overall length of the flame is shortened. Shorter flames introduce a larger amount of secondary air and increase the mixing effect between the flame and the air, which leads to combustion and complete combustion, resulting in a stable flame and a blue flame. .

In other words, as the flame is separated into four, the surface area of the flame is widened, and the area of contact with the surrounding air, that is, the secondary air, is relatively widened, so that combustion of the gas is more activated, thereby enabling complete combustion.

And the flame holder 660 serves to partition between the inside and the outlet of the mixing tube 24 to prevent the flame from backfire and to prevent the flame from becoming unstable by external influences.

As the flame is shortened and the combustion is completed in this way, the present invention does not overcome the lifting phenomenon in which the ignition point of the flame is located far from the outlet of the mixing tube 24 and the overheating of the air supplied to the drying chamber 5. Will be prevented.

On the other hand, when the drying process again, as the gas is burned as described above, the outside air introduced into the inside of the guide funnel 20 is heated to be changed into hot air, and the drying chamber 5 through the hot air supply duct 12. Flows into).

The hot air introduced into the drying chamber 5 inside the drum 1 absorbs moisture contained in the laundry cloth and passes through the lint filter 14 to the blower 17 through the lint duct 15. It blows into the exhaust pipe 19 by this.

As described above, in the gas combustion device for a dryer according to the present invention, a flame holder is installed in front of the outlet of the mixing pipe so that the flame is divided into several branches.

By doing so, in the present invention, the length of the flame can be shortened, thereby preventing the lifting phenomenon and the invasion of the flame into the drum.

In addition, as the flame splits into several parts, the surface area of the flame increases, and the inflow of the secondary air into the flame increases, resulting in an increase in the mixing effect between the flame and the secondary air, resulting in complete combustion. Is stabilized.

In addition, the flame holder prevents the combustion environment of the front and rear portions thereof from being transferred to the opposite sides to prevent backfire and the like, thereby helping to stably form the flame.

Claims (4)

A gas nozzle for supplying and injecting gas, A mixing tube for mixing the gas injected from the gas nozzle and the primary air; An ignition device installed at the outlet side of the mixing tube and igniting the gas mixed with the primary air exiting through the outlet of the mixing tube; And a flame holder spaced apart from the outlet side of the mixing pipe, the flame holder having flame holes for burning the gas mixed with the primary air. The method of claim 1, The flame holder is a "b" shaped plate structure consisting of a vertical plane and a horizontal plane, the center of the vertical plane is provided with a circular flame hole, both sides of the vertical surface is provided with a side wall surface having a width toward the holder back Gas Combustion Device. The method of claim 1, The side wall surface provided at both edges of the vertical plane of the flame holder is formed by cutting a certain portion of both edges of the corner where the vertical plane and the horizontal plane meets and bends backwards. The method of claim 1, The flame holder is a gas combustion device for a dryer, characterized in that the support portion extending from one side of the horizontal plane is installed to be located in front of the outlet of the mixing tube is fixed to the mixing tube outlet side.

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