WO2012023689A1

WO2012023689A1 - Low-noise, premixing burner

Info

Publication number: WO2012023689A1
Application number: PCT/KR2011/002930
Authority: WO
Inventors: 민태식
Original assignee: 주식회사 경동나비엔
Priority date: 2010-08-19
Filing date: 2011-04-22
Publication date: 2012-02-23
Also published as: KR101167792B1; KR20120017540A

Abstract

The present invention relates to a low-noise, premixing burner which prevents resonance-based noise generation during combustion by having an improved flame hole structure. According to the premixing burner of the present invention, which mixes gas with air in advance for combustion, a burner body is formed by overlapping a plurality of partially cut plates, and the plates are arranged such that the cut parts of the adjoining plates cross each other while forming a mixed gas passage and a plurality of flame holes. The flame holes formed at the upper portion of the burner body have different sizes.

Description

Low Noise Premixed Burners

The present invention relates to a low-noise premixed burner, and more particularly, a plurality of cut portions are overlapped to form a plurality of salt holes by intersecting the cut portions between neighboring plates to form a plurality of salt holes. The present invention relates to a low noise premixed burner that can reduce the generation of noise due to resonance phenomena during combustion by differently configuring the natural frequencies of the respective salt holes.

In general, a gas burner used in a combustion device such as a boiler or a water heater may be classified into a Bunsen burner and a pre-mixed burner according to a method of mixing combustion gas and air.

The Bunsen burner is a burner that supplies the minimum primary air necessary for combustion from the nozzle injecting the gas and supplies the excess secondary air to the part where the flame is formed to realize complete combustion, and has excellent combustion stability. On the other hand, since the flame is formed by the secondary air, the flame length is long.

In contrast, the premix burner burns the premixed gas pre-mixed with the combustion gas and air in the mixing chamber, enabling operation at a low air ratio, enabling high efficiency, high load combustion, and reducing the overall flame length. At the same time, the temperature of the flame has the advantage of reducing the generation of pollutants such as carbon monoxide and nitrogen oxides.

Conventionally, Bunsen burners are mainly used, but in recent years, premixed burners are mainly used to reduce the generation of pollutants and to downsize the combustion chamber.

Conventional premixing gas burner has a structure in which the air supplied from the blower and the combustion gas supplied through the gas supply pipe is premixed in the burner body and supplied to the burner flame hole provided on the upper side.

Conventional burner flame has been used a structure in which a plurality of salt holes perforated on a plate or a plate made of a cylindrical, such a structure has a problem that a plurality of salt holes are formed in a constant size to amplify the noise during combustion.

That is, every machine and structure has multiple natural frequencies, and when an external force is applied to vibrate at one or more natural frequencies, it is 10 to 100 times more dynamic than when the same force is applied at frequencies lower or higher than the natural frequency. When the excitation frequency caused by the external force coincides with one or more natural frequencies, a lot of noise is generated due to the resonance phenomenon.

The frequency characteristics of the noise generated during the combustion of the premix burner depend on the size and shape of the salt holes.The natural frequency of the salt holes is determined by the size and shape of the salt holes, and the frequency of the noise is determined by the natural frequency of the salt holes. If the size and shape of a plurality of salt holes formed as in the prior art is the same, the natural frequencies of the respective salt holes are also the same. Therefore, when the external force having the same frequency as the natural frequency acts, the noise is amplified by the resonance phenomenon. There was this.

In addition, the salt structure of the conventional premixed burner has a problem that the burner combustion surface is deformed due to thermal stress or, in severe cases, the salt hole is damaged, causing incomplete combustion and backfire, and due to the heat of the burner surface during low load combustion. The expansion is cumulative to apply a large force to the structure to fix the burner has a problem that the structure is weakened and durability is reduced.

The present invention is devised to solve the above problems, and an object of the present invention is to provide a low noise premix burner that can prevent the generation of noise due to resonance phenomenon during combustion by improving the structure of the salt hole of the premix burner.

In addition, an object of the present invention is to provide a low noise premixed burner that can extend the service life by preventing a large force is applied to the structure for fixing the burner even if the thermal expansion due to the heat of the burner accumulated.

In the low noise premix burner of the present invention for realizing the above object, in the premix burner which mixes gas and air in advance to combust, a plurality of plates partially cut are overlapped to form a burner body part, The plurality of plates are disposed such that the cut portions between neighboring plates cross each other to form a mixed gas flow path and a plurality of salt holes, and the plurality of salt holes formed on the burner body part have different sizes.

In this case, the burner body part has a shape in which a part of a side surface is opened between neighboring plates, and an inner plate in which plates of different thicknesses overlap each other, and is coupled to a front surface and a rear surface of the inner plate, thereby transferring the mixed gas flow path. It may be configured to include an outer plate for sealing the rear surface.

The inner plate may further include a body member disposed on both sides, a plurality of T-shaped members disposed at different intervals between the body members, and horizontally disposed between the body members on both sides of the body member and the plurality of body members. It can be composed of a fixing member for coupling the T-shaped member of.

In addition, the inner plate is formed of a width length of the body member and the width of the upper end portion of the T-shaped member between the adjacent plates each different size, the bonding surface between the T-shaped members of the adjacent plate is arranged alternately Can be.

In addition, the salt hole may be formed by the space formed between the space between the upper end of the T-shaped member and the body member adjacent to the T-shaped member.

In addition, the position where the fixing member is coupled to the T-shaped member is spaced up and down between the adjacent inner plate, the mixed gas introduced into the lower portion of any one of the inner plate is switched to the flow path by the fixing member inside the adjacent inner plate After passing through the space may be configured to be discharged through the salt holes formed on the upper side.

According to the low noise premix burner according to the present invention, by forming a different size and shape of the plurality of salt holes formed in the premix burner to prevent the resonance phenomenon during the combustion of the burner to prevent the occurrence of noise caused when the resonance phenomenon occurs It works.

In addition, according to the present invention, a plurality of plates cut in part are overlapped to form burner flame portions, and the burner body portion and salt holes cross each other so that thermal expansion of the burner surface can be absorbed in its own structure, thereby supporting the burner. There is an effect to prevent a large force is applied to the structure to extend the endurance life of the burner.

In addition, according to the present invention, it is possible to improve the combustion efficiency by reducing the degree of deformation of the salt holes by the thermal stress to increase the stability of the flame and prevent incomplete combustion, the installation structure of the burner flame hole is simple and the installation work is easy The manufacturing time and cost of the burner can be reduced.

1 is a perspective view showing a salt portion of a low noise premix burner according to the present invention,

2 is a partially exploded perspective view of FIG. 1;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along line B-B of FIG. 1;

5 is a cross-sectional view taken along the line C-C of FIG.

6 is a cross-sectional view taken along the line D-D of FIG. 1.

** Explanation of Codes **

1: flame part 10: burner body part

21,22: Floor support frame 23,24: Side support frame

100: inner plate 110: first inner plate

120: second inner plate 130: third inner plate

140: fourth inner plate 150: fifth inner plate

160: sixth inner plate 170: seventh inner plate

111a, 111b, 121a, 121b, 131a, 131b, 141a, 141b: body member

112,113,114,115,116,117,118: T-shaped member

119,129,139,149,159,169,179: fixing member

130a, 150a, 170a: Mixed gas inlet

110b, 120b, 140b, 160b: interior space

110c, 120c, 130c, 140c, 150c: Flame Attack

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a salt portion of a low noise premix burner according to the present invention, Figure 2 is a partially exploded perspective view of Figure 1, Figure 3 is a cross-sectional view taken along line A-A of FIG.

The low noise premixed burner according to the present invention is formed by overlapping a plurality of plates to form a flow path and a plurality of salt holes of a mixed gas of gas and air, and by configuring different sizes and shapes of the plurality of salt holes, By not overlapping, it is possible to greatly reduce the noise generated when burning the burner by avoiding the resonance phenomenon when the external excitation frequency coincides with the natural frequency of the salt hole.

In this configuration, the salt hole 1 constituting the low-noise premixed burner according to the present invention, a plurality of plates cut in part is overlapped to form a burner body portion 10, the cut of the overlapping plate The gas and air mixed gas flow path and

salt holes

110c, 120c, 130c, 140c, and 150c are communicated through the gaps of the portions, and the burner body part 10 and the

salt holes

110c, 120c, 130c, 140c, 150c) are positioned to cross each other, and the plurality of

salt holes

110c, 120c, 130c, 140c, and 150c are formed to have different sizes, respectively.

1 and 2, the flame hole 1 includes a burner body 10,

bottom support frames

21 and 22 for supporting and fixing the burner body 10, and

side support frames

23 and 24 in front and rear. It is composed.

The burner body 10 has a shape in which a part of a side surface is opened between neighboring plates, and the inner plate 100 repeatedly overlapping the

plates

110, 120, 130, 140, 150, 160 and 170 of a set unit formed to have different thicknesses, respectively, and the inner plate. Is coupled to the front and rear surfaces of the (100) is composed of outer plates (210, 220) to seal the front and rear surfaces of the mixed gas flow path formed in the inner plate 100.

In FIG. 1, reference numerals 110-1,120-1,130-1,140-1,150-1,160-1,170-1,110-2,120-2,130-2,140-2,150-2,160-2,170-2,110-3 overlap the plates 110,120,130,140,150,160,170 of the set unit repeatedly. It is preferable that the plates of each set unit are also formed in different thicknesses.

The bottom support frames 21 and 22 support both sides of the bottom surface in the longitudinal direction of the burner body part 10, and maintain the overlapped state of the burner body part 10, and the

bottom support frames

21 and 22. The upper surface of the () is formed with a rectangular parallelepiped fitting groove (21a, 22a) corresponding to the shape of both sides of the bottom surface of the burner body portion 10, the burner body portion 10 inside the fitting groove (21a, 22a) Both sides of the bottom of the seat are seated and joined.

In the present embodiment, the inner plate 100 has a structure in which a set unit consisting of the first to seventh

inner plates

110, 120, 130, 140, 150, 160, and 170 is repeatedly arranged three times, and is repeatedly arranged with the number of plates constituting the set unit. The number of recovery is not limited to this, and it is obvious that the number may be modified by varying the number according to the capacity and installation environment of the burner.

Referring to FIG. 2, the first to seventh

inner plates

110, 120, 130, 140, 150, 160, and 170 constituting the set unit constituting the inner plate 100 may have different shapes, but may be adjacent to each other through a gap in which the inner plate 100 is partially cut. Some sections are communicated between the plates to form a flow path of the mixed gas, and the flow path of the mixed gas has a structure in communication with the salt holes 110c, 120c, 130c, 140c, and 150c formed at predetermined intervals therebetween.

The structure of the inner plate 100 will be described by taking the first inner plate 110 as an example, and disposed at different intervals between the

body members

111a and 111b disposed on both sides and the

body members

111a and 111b. And widths of the upper ends of the plurality of T-shaped

members

112, 113, 114, 115, 116, 117 and 118, and the

body members

111 a and 111 b, respectively, and are formed in a transverse direction so that the

body members

111 a and 111 b and the T-shaped

members

112, 113, 114, 115, 116, 117 and 118. It is composed of a fixing member 119 for coupling. Here, the

body members

111a and 111b constituting the first inner plate 110, the T-shaped

members

112, 113, 114, 115, 116, 117, 118, and the fixing member 119 are merely ones with the names and the reference numerals for convenience of description, and are integrated. It can be configured as.

In addition, the second inner plate 120, the third inner plate 130, the fourth inner plate 140, and the like, which are sequentially overlapped with the rear side of the first inner plate 110, are similarly similar to the

body members

121a and 121b, respectively. And 131a, 131b, 141a, and 141b, T-shaped members 122 to 128, 132 to 138, 142 to 148, and fixing

members

129, 139 and 149, and the fifth to seventh

inner plates

150, 160 and 170 at the rear thereof have the same pattern. Can be configured.

Here, the

body members

111a, 111b, 121a, 121b, 131a, 131b, 141a, and 141b are formed with different widths between adjacent plates, and also different between the T-shaped members 122 to 128, 132 to 138, 142 to 148. It is formed at intervals, and the joint surfaces of the T-shaped members (112 to 118, 122 to 128, 132 to 138, 142 to 148) of the adjacent plates are alternately arranged without being matched, so that the flow path of the mixed gas can move laterally in the inner space of the adjacent plate. Structure.

The T-shaped members 112 to 118, 122 to 128, 132 to 138, 142 to 148 are configured to have different widths of the upper end portions, and

salt holes

110c, 120c, 130c, and 140c having different sizes in the space between the upper end portions of adjacent T-shaped members. 150c) is formed.

In this case, the thicknesses of the

individual plates

110, 120, 130, 140, 150, 160 and 170 constituting the inner plate 100 and the spacing of the adjacent T-shaped members 112 to 118, 122 to 128, 132 to 138, 142 to 148 are different from each other so that the salt holes 110c, 120c, By forming 130c, 140c, and 150c in different sizes, the natural frequencies of the salt holes 110c, 120c, 130c, 140c, and 150c may be configured differently.

The positions where the fixing

members

119, 129, 139, and 149 are coupled to the T-shaped members 112 to 118, 122 to 128, 132 to 138, 142 to 148 may be configured such that patterns spaced up and down between adjacent inner plates alternate.

That is, as shown in FIG. 2, in the case of the second inner plate 120, the fourth inner plate 140, and the sixth inner plate 160, the fixing

members

129, 149, and 169 are coupled to the lower ends of the T-shaped members. In the case of the third inner plate 130, the fifth inner plate 150, and the seventh inner plate 170 disposed therebetween, the fixing

members

139, 159, and 179 are coupled to the middle portion of the T-shaped member in the vertical direction. It may consist of.

As such, the fixing

members

129, 139, 149, 159, 169, and 179 of the plates constituting the inner plate 100 are alternately arranged at positions spaced apart from each other, and as shown in FIG. 3, the third inner plate 130 and the fifth inner side.

Mixed gas inlets

130a, 150a, and 170a are formed at the lower ends of the plate 150 and the seventh inner plate 170, respectively.

In addition, the mixed gas introduced through the

mixed gas inlets

130a, 150a, and 170a is formed at an inner middle portion of the second inner plate 120, the fourth inner plate 140, and the sixth inner plate 160. The

internal spaces

120b, 140b, and 160b are formed so that the flow path is switched in both directions as a reference.

In addition, at the upper end portions of the third inner plate 130, the fifth inner plate 150, and the seventh inner plate 170, salt holes for discharging the mixed gas from which the flow path is switched back from the

inner spaces

120b, 140b, and 160b ( 130c, 150c, 170c are formed.

FIG. 4 is a sectional view taken along the line BB of FIG. 1 to show the

mixed gas inlets

130a, 150a and 170a formed at the lower end of the burner body 10, and FIG. 5 is a sectional view taken along the line CC of FIG. The

internal spaces

110b, 120b, 140b, and 160b through which the mixed gas moves are formed in the middle of the portion 10. FIG. 6 is a sectional view taken along the line DD of FIG. 1, and an upper end portion of the burner body portion 10. FIG.

Salt holes

110c, 120c, 130c, 140c, and 150c are formed in the pattern, and the pattern is repeatedly formed on the overlapping plates.

According to the low-noise pre-mixed burner according to the present invention as described above, by forming a burner body portion by overlapping a plurality of plates cut part of the inside, the flow path of the mixed gas is provided therein is configured to communicate with the salt hole of the upper side, Since a plurality of salt holes are formed in different sizes and different natural frequencies, resonance phenomenon can be avoided and noise can be greatly reduced.

In addition, according to the present invention, even if the plate constituting the burner body portion is thermally expanded by the accumulation of combustion heat generated during combustion, a large force is applied to the structure for fixing the burner body portion by absorbing the expanded volume through the gap between the overlapping plates. To prevent burnout and extend the burner's endurance life.

In addition, by overlapping a plurality of plates constitute a burner body portion formed with a mixed gas flow path and salt holes, and after mounting the fixed burner body portion on the bottom support frame, the installation work of the burner salt hole can be completed only by combining the side support frame. This facilitates the manufacturing of the burner and has the advantage of reducing the manufacturing cost.

Claims

In the pre-mixed burner which mixes gas and air in advance to combust,

A plurality of plates partially cut are overlapped to form a burner body part,

The plurality of plates are arranged so that the cut portions between neighboring plates cross each other to form a mixed gas flow path and a plurality of salt holes,

Low noise pre-mixed burner, characterized in that the plurality of salt holes formed on the burner body portion formed in a different size.
According to claim 1, wherein the burner body portion,

An inner plate in which a portion of a side surface is opened between neighboring plates, and plates formed of different thicknesses overlap each other;

And an outer plate coupled to the front and rear surfaces of the inner plate to seal the front and rear surfaces of the mixed gas flow path.
The method of claim 2, wherein the inner plate,

A body member disposed on both sides, a plurality of T-shaped members disposed at different intervals between the body members, and horizontally installed between the body members on both sides to couple the body member and the plurality of T-shaped members. Low noise pre-mix burner, characterized in that consisting of a fixing member.
The method of claim 3,

The inner plate has a width length of the body member and a width length of the upper end portion of the T-shaped member between adjacent plates, respectively, different sizes, so that the joining surfaces between the T-shaped members of the adjacent plates are alternately disposed. Low noise premixed burner.
The method of claim 3,

And the flame hole is formed by a space between the body member and the upper end of the T-shaped member adjacent thereto and a space between the upper end of the T-shaped member.
The method of claim 3,

The position where the fixing member is coupled to the T-shaped member is spaced up and down between adjacent inner plates, so that the mixed gas flowing into the lower portion of any one inner plate is switched by the fixing member so that the flow path is changed into a space inside the adjacent inner plate. Low noise pre-mixed burner, characterized in that discharged through the salt hole formed on the upper side after passing through.