WO2007086146A1

WO2007086146A1 - Combustion apparatus

Info

Publication number: WO2007086146A1
Application number: PCT/JP2006/301494
Authority: WO
Inventors: Masahiko Shimazu; Takashi Akiyama; Takeshi Wakada; Lin Xie; Takashi Hasegawa; Itsuo Nagai; Takashi Wakatake
Original assignee: Noritz Corporation
Priority date: 2006-01-30
Filing date: 2006-01-30
Publication date: 2007-08-02
Also published as: JPWO2007086146A1; CN101233365B; CN101233365A; HK1120594A1; JP4743548B2; DE112006003642T5; US20080160467A1

Abstract

This invention provides a combustion apparatus that is an improved combustion apparatus for two-stage combustion, which combustion apparatus can generate, in a good balance, primary flame and secondary flame which are evenly spread over the whole area of the combustion site. The combustion apparatus (1) comprises an intermediate member (6) and an air flow passage member (5). The intermediate member (6) comprises a premixture member (2) and a flame hole member (3) and is held between the two air flow passage members (5). Fuel gas flows into an opening row part (10). In the opening row part (10), a number of openings (8) are arrayed linearly. The fuel gas which has entered the opening row part (10) is released evenly from the individual openings (8). The fuel gas released from the openings (8) in the opening row part (10) collide against air in sites in a mixing space (39). The fuel gas released from slits is homogeneous at an even release rate. The fuel gas generates primary flame in a first combustion part (46) for primary combustion. An unburned component is released from the opening of the first combustion part (46) to the outside, and air is supplied from the front end part of the air flow passage member (5) to generate secondary flame.

Description

Specification

Combustion equipment

Technical field

[0001] The present invention relates to a combustion apparatus, and more particularly to a combustion apparatus recommended to be employed in a water heater or a bath apparatus.

Background art

[0002] Combustion devices are main components of water heaters and bath devices, and are widely used not only in factories but also in general households.

In recent years, environmental damage caused by acid rain has become a serious social problem, and it is an urgent task to reduce the total amount of NOx (nitrogen oxides).

Combustion equipment that employs a combustion method called the concentration combustion method is a configuration that can be applied to small devices such as water heaters and that can suppress the amount of NOx generated. In the lean combustion method, the main flame is generated from a lean mixed gas that is premixed with about 1.6 times the theoretical air volume in the fuel gas, and there is little air mixing in the vicinity of the main flame. A flame holder that generates mixed gas force with high concentration is placed.

For example, a configuration as disclosed in Patent Documents 1 and 2 is known as a combustion apparatus to which concentration combustion is applied.

[0003] In addition, there is another combustion method called a two-stage combustion method as a combustion method that generates less NOx. The two-stage combustion method is a combustion type in which fuel gas is injected in an oxygen-deficient state, the gas is ignited to generate a primary flame, and secondary air is supplied to unburned gas to generate a secondary flame. It is.

A combustion apparatus employing a two-stage combustion method is disclosed in Patent Document 3.

Patent Document 1: JP-A-5-118516

Patent Document 2: JP-A-6-126788

Patent Document 3: JP-A 52-143524

Disclosure of the invention

Problems to be solved by the invention [0004] Combustion devices that employ the light and dark combustion method are well-received in dredging fields where the amount of NOx generated is small, but have the disadvantage of a small turn-down ratio (TDR). In particular, a combustion apparatus that employs a light and dark combustion method has a drawback that it is difficult to burn in a region where the calorific value is small.

That is, in the lean combustion method, as described above, the main flame is generated from a lean mixed gas obtained by premixing fuel gas with about 1.6 times the theoretical air volume. This gas mixture is lean but has a slow combustion rate.

[0005] By the way, a combustion apparatus that employs the lean combustion method includes a blower to generate a lean mixed gas. However, the blower has been used for many years, and the amount of blown air gradually decreases as the blower ages. The amount of air flow may be reduced due to clogging of the filter. Thus, when the blast volume decreases due to secular change, the air volume of the mixed gas that forms the main flame tends to decrease, and the mixed air volume approaches the theoretical air volume. As a result, the combustion speed of the main flame tends to be accelerated by secular change, and the base end of the flame gradually approaches the flame hole due to secular change. For this reason, if it is burned in a region where the amount of heat generated is small, the base of the flame will be close to the flame hole and damage the flame hole. For this reason, a combustion apparatus that employs a light and dark combustion method must limit combustion in a region where the calorific value is small in anticipation of secular change.

[0006] Power! The concentration combustion method is unsatisfactory because the range of usable gases is narrow. In other words, the fuel gas supplied by the gas manufacturer may consist of only a single component, but in many cases, multiple components of fuel gas are mixed. For this reason, even if the amount of heat generated (the amount of heat per unit volume) is the same, the combustion rate differs for each fuel gas manufacturer. On the other hand, in the light and dark combustion method, the main flame is burned in an excess air state, so the combustion speed is slow, and the fuel gas burns out and cannot be burned stably.

[0007] On the other hand, when the two-stage combustion method is employed, the turndown ratio can be made higher than when the concentration combustion method is employed. There are also a wide variety of applicable fuel gases. However, in the two-stage combustion method, the combustion state is unstable because the fuel gas is burned in a state where oxygen is insufficient. For this reason, there are no commercially available water heaters that use the two-stage combustion method.

[0008] That is, in order to put it into practical use as a combustion apparatus, it spreads uniformly over a certain area. It is necessary to generate a flame. For that purpose, the primary flame and the secondary flame must be generated in a well-balanced manner, and they must be uniform over the entire combustion area.

However, it is difficult to generate a primary flame and a secondary flame in a well-balanced manner and distribute them uniformly over the entire combustion site. That is, the primary flame partially disappears and the downstream secondary flame becomes excessive, or all the fuel burns at the site where the primary flame should be generated, and the downstream secondary flame disappears. May end up. Therefore, there are no water heaters that have been put to practical use that employ a two-stage combustion system.

[0009] Therefore, the present invention focuses on the above-described problems of the prior art, improves the combustion apparatus that performs the two-stage combustion, generates the primary flame and the secondary flame in a well-balanced manner, and extends over the entire combustion site. The issue is to develop a combustion device that spreads evenly.

Means for solving the problem

[0010] An invention for solving the above-described problem includes a premixing member that premixes fuel gas and air inside, a flame hole member, and an air flow path member, and the premixing member has an opening. The air flow path member has a wall shape and has a front end air discharge opening on the front end side, and the flame hole member is located between the two air flow path members. Alternatively, the space is disposed between the air flow path member and another wall surface, and there is a flame hole upstream flow path between the opening row portion and the flame hole member, and the space surrounded by the flame hole member and the air flow path member. To form a first combustion section, air is supplied to the air flow path member, the flame hole upstream flow path, and the premixing member, fuel gas is supplied to the premixing member, and fuel gas is fed into the premixing member. After being mixed with air, the opening force of the opening row is supplied to the upstream flow path of the flame hole and further mixed with air, and oxygen Released by the combustion in the first combustion section burner port member force foot state, a further combustion apparatus characterized by burning supplied with tip air discharge opening force air in the air passage member.

The present invention has a premixing member, and fuel gas and air are premixed in the premixing member. The premixing member includes an opening row portion having openings arranged in a row, and fuel gas is distributed and supplied from the opening of the opening row portion to the flame hole upstream flow path. The fuel gas is also mixed with air in the flame channel upstream of the flame hole. Therefore, according to the configuration of the present invention, the fuel gas and the air are well mixed in the mixed gas flowing through the flame hole upstream side flow path and are homogeneous. Therefore, the flame hole Area force across the wall of the material A homogeneously adjusted fuel gas is released. Therefore, the primary flame and the secondary flame are generated in a well-balanced manner and spread uniformly over the entire combustion site.

[0012] It is desirable that there is a certain amount of spatial force S in a part of the above-mentioned flame hole upstream side flow path and in the vicinity of the opening row portion. This space is a mixing space for mixing fuel and air, and it is preferable that the opening of the opening row portion is opened to the mixing space.

[0013] Further, it is desirable that the mixing space described above communicates over substantially the entire area of the opening row portion.

[0014] When the mixing spaces are communicated in this way, the pressure is promoted to be uniform.

[0015] It is desirable that the opening of the opening row portion be opened in a direction intersecting with the flow direction of the airflow flowing through the flame hole upstream side flow path.

[0016] Since the fuel gas is discharged in a direction intersecting the opening force air flow of the opening row portion, there are many opportunities for collision with air. Therefore, mixing of fuel gas and air is promoted.

[0017] The force that can be considered as a variety of structures of the flame hole member For example, the flame hole member has a flame hole forming portion and two side wall portions, and is between the two side wall portions and faces the flame hole forming portion. An opening part is provided in the site | part to perform, the opening row | line | column part of a premixing member is arrange | positioned in the position enclosed by the said side wall part, and it can be set as the structure by which air is introduce | transduced from the said opening part.

[0018] In addition, a configuration in which an air discharge opening for the combustion section that discharges air by urging the first combustion section is provided is also recommended. At this time, it is desirable to arrange the air discharge opening for the combustion part between the flame hole group of the flame hole member and the flame hole group.

[0019] The first combustion part is a part that generates a primary flame, and a secondary flame is generated outside the first combustion part by the air supplied from the tip air discharge opening. The air discharge opening for the combustion part is arranged between the flame hole group of the flame hole members so as to release the side force air by directing the flame, and the primary force by flowing the ambient force air of the flame hole group, It becomes possible to hold the flame surely. In addition, since the downward force of the primary flame is also supplied with air, the secondary flame can be generated from an early stage, and the fuel gas burns completely in a space close to the primary flame. As a result, the combustion space becomes compact, and the total length of the primary flame and the secondary flame can be shortened. In addition, the base end of the secondary flame is stabilized.

[0020] A configuration in which an inclined surface is provided on the air flow path member and an air discharge opening for the combustion section is provided on the inclined surface is also recommended. [0021] According to this configuration, air is injected in an oblique direction, and the main primary flame flow and combustion gas flow are not disturbed!

Further, according to this configuration, air is mixed along the main primary flame flow and combustion gas flow, and therefore does not stay near the wall surface of the air flow path member.

That is, the combustion gas flows in a direction substantially parallel to the wall surface in the first combustion portion. Therefore, if air is introduced in a direction perpendicular to the first combustion part, the air may collide with the primary flame or combustion gas, resulting in stagnation. When air stays in the vicinity of the wall surface of the air flow path member, the surrounding unburned gas burns with the retained air, and a flame is generated near the wall surface of the air flow path member. Therefore, there is a problem that the wall surface is heated excessively and becomes red hot.

On the other hand, if air is injected in an oblique direction, the air is mixed along the flow of the primary flame and the flow of combustion gas, and a secondary flame is generated at a position away from the air flow path member. Can do. Therefore, the wall surface of the air flow path member will not be red hot.

[0022] Further, another recommended configuration is that an upstream air discharge opening is provided on the upstream side of the portion constituting the first combustion portion of the air flow path member, and the air discharged from the upstream air discharge opening is provided. Is flowed to the side surface side of the flame hole member.

[0023] According to the configuration described above, the upstream air discharge opening force The released air flows to the side surface side of the flame hole member, so that oxygen is supplied to the side surface side of the flame hole member. Therefore, a stable flame is generated on the side surface portion of the flame hole member, and the base end portion of the primary flame is held. As a result, the primary flame is stabilized.

[0024] In another recommended configuration, the flame hole member has a center side opening and a side opening, and the flow rate of the fuel gas discharged from the side opening is discharged from the center opening. In this configuration, air that is slower than the flow velocity of the fuel gas flows in the vicinity of the side opening of the flame hole member.

[0025] This configuration clearly separates a flame hole that generates a primary primary flame and a flame hole that generates a flame for the purpose of flame holding.

That is, in the above-described configuration, the flow rate of the fuel gas released from the side opening is slower than the flow rate of the fuel gas released from the center opening force, so that the flame generated at the side opening has less fire. Furthermore, since air is supplied near the side opening, the side opening force is released. The fuel gas burns stably in a relatively stable state and holds the base end of the primary flame. As a result, the primary flame is stabilized.

[0026] As the structure of the side opening, for example, the flame hole member is constituted by a main body part and a pressure reducing wall provided on the side face of the main body part, and a gap is provided between the side face of the main body part and the pressure reducing wall. A structure is conceivable in which a side opening is formed, an opening is provided in the main body, and a part of the fuel gas flowing through the main body flows into the gap.

[0027] In the above configuration, the fuel gas flows into the gap formed by the decompression wall from the opening provided in the main body, but the amount of the fuel gas (precisely, the fuel gas premixed with air) is Therefore, the flow velocity of the fuel gas from which the side-side opening force is also released becomes slower than the flow velocity of the fuel gas released from other site forces.

[0028] The shape of the opening provided in the opening row portion may be a slit shape.

[0029] The opening row portion may have an inclined surface, and an opening may be provided on the inclined surface. At this time, it is desirable that the inner angle of the opening row portion is 180 ° or less.

[0030] By providing the opening on the inclined surface, the fuel gas is discharged in an oblique direction. This increases the chance of contact with the air stream and promotes mixing of fuel gas and air.

[0031] A configuration in which the tip of the air flow path member has an acute ridgeline shape is also recommended.

[0032] There is an air discharge opening on the front end side of the air flow path member, and secondary air is supplied. In the above configuration, the front end of the air flow path member has an acute ridgeline shape, so There is little air wraparound. Therefore, the air discharge direction is stabilized.

The invention's effect

[0033] The combustion apparatus of the present invention is practical because the primary flame and the secondary flame are generated in a well-balanced manner and uniformly spread over the entire combustion area. In addition, the combustion apparatus of the present invention can set the turn-down ratio high with less generation of nitrogen oxides. Furthermore, the combustion apparatus of the present invention does not select any kind of gas that can be widely applied to the combustion gas combustion rate. Brief Description of Drawings

FIG. 1 is a cross-sectional perspective view of a combustion apparatus schematically illustrating the structure of the combustion apparatus of the present invention.

FIG. 2 is a perspective view of a combustion apparatus in a practical embodiment of the present invention.

FIG. 3 is a plan view when the combustion apparatus of FIG. 2 is housed in a case. [Fig. 4] A-A cross section of Fig. 3.

FIG. 5 is a cross-sectional view of the combustion apparatus of FIG.

FIG. 6 is a perspective view showing the internal structure of the combustion device of FIG.

FIG. 7 is an exploded perspective view of the combustion apparatus of FIG.

FIG. 8 is an exploded cross-sectional view of the combustion apparatus of FIG.

FIG. 9 is a perspective view of a premixing member of the combustion apparatus of FIG.

FIG. 10 is a cross-sectional view taken along line AA in FIG.

FIG. 11 is a cross-sectional view taken along the line BB in FIG.

FIG. 12 is a perspective view of an air flow path member of the combustion apparatus of FIG.

FIG. 13 is an enlarged view of a concave change portion of the air flow path member of FIG.

FIG. 14 is a perspective view of a flame hole member of the combustion apparatus of FIG.

FIG. 15 is an enlarged front view of the fitting groove portion of the flame hole member of FIG.

FIG. 16 is a side view showing a state in which a flame hole member and a premixing member are coupled together.

FIG. 17 is an enlarged view of the vicinity of the base end portion of the flame hole member of FIG.

FIG. 18 is an explanatory diagram showing the positional relationship between the opening of the premixing member and the ridges of the air flow path member.

FIG. 19 is an explanatory view showing the positional relationship between the opening of the premixing member and the ridges of the air flow path member in another embodiment.

FIG. 20 is an explanatory diagram showing the flow of air in the air flow path member in the present example.

FIG. 21 is an explanatory view showing the flow of air in the air flow path member in another embodiment.

FIG. 22 is an exploded perspective view of a combustion apparatus according to another embodiment.

FIG. 23 is an exploded perspective view of a combustion apparatus in still another embodiment.

FIG. 24 is a partially enlarged plan view showing the positional relationship between the flame hole group of the flame hole member and the air discharge opening for the combustion part of the air flow path member.

Explanation of symbols

1 Combustion device

2 Premixed parts

3 Flame hole material

5 Air channel member 6 Intermediate member

8 opening

10 Open row

13 Air flow path

15 Air guide H opening

20 21 Tip opening

23 Air discharge opening for combustion section

25 Body material

26 Decompression wall

27 Side opening

29 Air gap

31, 32 Side wall

35 opening

39

46 First combustion section

48 Air discharge opening (upstream side)

49 Flame hole upstream flow path

66, 67 Inclined surface

68 Slit-shaped opening

69 Slit-shaped opening

BEST MODE FOR CARRYING OUT THE INVENTION

Examples of the present invention will be described below. First, the schematic configuration and basic functions of the present invention will be described with reference to the schematic diagram of FIG. The embodiment of FIG. 1 conceptually illustrates the present invention.

In the following description, the vertical relationship is based on the posture in which the combustion apparatus 1 is placed vertically and a flame is generated on the upper side. The expressions on the upstream and downstream sides are based on the flow of air or fuel gas. The width direction is the direction corresponding to the left-right direction (the direction of arrow W in the drawing) with the largest area of the combustion device as the front. [0037] The combustion apparatus 1 of the present embodiment is used in parallel with a case, or used alone. The combustion apparatus 1 of the present embodiment includes a premixing member 2, a flame hole member 3, and two air flow path members 5. In the combustion apparatus 1 of the present embodiment, the premixing member 2 and the flame hole member 3 are fitted together to form one intermediate member 6, and the intermediate member 6 is interposed between the two air flow path members 5. Force in a sandwiched configuration When actually used, air flow path member 5, intermediate member 6, air flow path member 5, intermediate member 6, air flow path member 5 ... The premixing member 2 and the intermediate member 6 are arranged alternately to form a plane.

[0038] The premixing member 2 that is a constituent member of the combustion apparatus 1 is a member that functions to premix fuel gas and air inside. The premixing member 2 includes a mixing portion 7 having a curved path and an opening row portion 10 in which openings 8 are provided in a row. The opening row portion 10 is a portion where a cavity having a substantially rectangular cross section is long and linearly extended.

[0039] The air flow path member 5 is a member having a thin outline and a wall shape. The air flow path member 5 is made of thin plates on the front and back surfaces 11 and 12, and the front and back surfaces 11 and 12 are joined with a slight gap, and the three sides excluding the lower surface side are joined. In the interior, a gap serving as the air flow path 13 is provided.

The air flow path member 5 is formed by folding a single plate to constitute the front and back surfaces 11 and 12, and a sharp bent portion 14 is formed at the tip portion, and the bent portion 14 constitutes the top portion 9. The top 9 extends in a ridge shape.

On the other hand, on the base end side of the air flow path member 5, the space between the front and back surfaces 11, 12 is opened, and an air introduction opening 15 is formed.

[0040] The air flow path member 5 is provided with openings for air discharge in three regions. As described above, since the premixing member 2 and the intermediate member 6 are alternately arranged to form a plane, the same number of plates are provided in the same portion on the front and back surfaces 11 and 12 of the air flow path member 5. An opening is provided.

The region where the opening for air discharge is provided is roughly divided into a front end portion, a position facing the first combustion portion, and a position facing the intermediate member 6.

That is, the plates of the front and back surfaces 11, 12 of the air flow path member 5 are mostly arranged in parallel. Only the front end portion is bent in a mountain shape, and the inclined surfaces 16, 16 are formed on the front surface side and the back surface side. 17 shaped It is made. A tip opening 20 is provided on the inclined surfaces 16 and 17. A distal end opening 21 is also provided at the most distal end portion (ridge line portion). The tip openings 20, 21 are provided for supplying secondary air to the secondary flame.

[0042] Further, the front and back surfaces 11, 12 of the air flow path member 5 have the air flow path 13 on the front end side made narrower than the base end side as shown in FIG. There is a step at the site corresponding to the base end. This step is also an inclined surface 22. The step part is provided with an air discharge opening 23 for the combustion part. The air discharge opening 23 for the combustion section supplies secondary air to the primary flame of the first combustion section 46 and burns part of the primary flame to generate a secondary flame in a part of the first combustion section 46. It is.

Furthermore, an air discharge opening (upstream air discharge opening) 48 is also provided at a position facing the intermediate member 6. The air discharge opening (upstream air discharge opening) 48 supplies air to the side surface portion of the flame hole member 3 to stabilize flame holding.

The flame hole member 3 includes a main body member 25 and a pressure reducing wall 26. The main body member 25 of the flame hole member 3 is formed by bending a single metal plate, and includes a top surface 30 that functions as a flame hole, and two end forces that are bent by about 90 °. It has side wall parts 31, 32. The left and right sides of the flame hole member 3 are closed, and only the surface located on the lower side of the drawing is open. The top surface 30 of the flame hole member 3 is long and elongated. On the top surface 30 of the main body member 25, slits to be the flame holes 33 are regularly arranged. The flame hole 33 provided in the main body member 25 functions as a “central opening”.

A bulging portion 34 bulging outward (in the thickness direction) is provided at an intermediate portion between the side wall portions 31 and 32. The bulging portion 34 is provided over the entire width of the flame hole member 3.

[0045] The open end sides of the side walls 31, 32 are folded back by about 90 ° twice as shown in the figure, and a fitting concave groove 38 is formed on the outside. The bottom wall 36 of the fitting groove 38 is perpendicular to the side walls 31, 32, and the outer wall 37 of the fitting groove 38 is parallel to the side walls 31, 32.

As described above, the decompression wall 26 is attached to the main body member 25. The decompression wall 26 is fixed to the side wall portions 31 and 32 of the main body member 25, and there is a gap 29 between the side wall portions 31 and 32 of the main body member 25. The air gap 29 is open on the upper side of the drawing. This opening functions as the side opening 27. An opening 35 is provided at a portion facing the decompression wall 26 in the side wall portions 31 and 32 of the main body member 25, and the inner surface of the main body member 25 and the gap 29 are communicated with each other.

Next, the relationship between the members will be described.

In this embodiment, as described above, the premixing member 2 and the flame hole member 3 are fitted together to form one intermediate member 6. More specifically, the opening row portion 10 of the premixing member 2 is inserted between the side wall portions 31 and 32 of the flame hole member 3. In the actual manufacturing process, the premixing member 2 is inserted through the openings (lower part of the drawing) between the side wall portions 31 and 32 of the flame hole member 3 to join them together.

[0048] The side wall portions 31, 32 and the opening row portion 10 are partially in contact with each other by an uneven shape (not shown), and both are integrally formed. Since the side wall portions 31 and 32 and the opening row portion 10 are partially in contact with each other due to the uneven shape as described above, conversely, they are partially separated. The cross section of FIG. 1 illustrates a cross section at a site where the side wall portions 31, 32 and the opening row portion 10 are separated.

The portions corresponding to the bulging portions 34 of the side wall portions 31 and 32 are separated from the included opening row portions 10. The portion of the bulging portion 34 corresponds to the row portion of the opening 8 of the opening row portion 10. Therefore, the outside of the opening 8 of the opening row portion 10 is separated from the side wall portions 31 and 32, and there is a wider space (mixing space) 39 than the others. This space communicates over the part corresponding to all the openings 8.

There is a relatively large space 47 between the side wall portions 31 and 32 and between the top portion of the opening row portion 10 and the top surface 30 portion of the flame hole member 3. In the present embodiment, the flame hole upstream flow path 49 is formed by the mixing space 39 and the space 47 on the downstream side of the opening row portion 10.

[0049] Air flow path members 5 are mounted on both sides of the intermediate member 6. The air flow path member 5 is coupled to the intermediate member 6 by fitting the fitting concave groove 38 of the flame hole member 3 into the air introduction opening 15 on the proximal end side. That is, the outer wall 37 of the fitting groove 38 is inserted into the air introduction opening 15, and the protruding end of the air flow path member 5 is inserted into the fitting groove 38 and brought into contact with the bottom wall 36 of the fitting groove 38. .

[0050] The air flow path member 5 and the intermediate member 6 (flame hole member 3) are partially in contact with each other by an uneven shape (not shown), and they are integrated together. Between the two, as described above, the uneven shape In other words, it is partly separated. The cross section of FIG. 1 illustrates a portion where the air flow path member 5 and the intermediate member 6 (flame hole member 3) are separated so that the function can be easily understood. However, the gap 40 between the air flow path member 5 and the intermediate member 6 is sealed by the bottom wall 36 of the fitting groove 38 at the upstream end of the combustion device 1 (the lower end in the drawing). . Therefore, the gap 40 between the air flow path member 5 and the intermediate member 6 communicates directly with the outside on the base end side.

[0051] The flame hole member 3 is located between the two air flow path members 5 as described above. The top surface 30 of the flame hole member 3 is located on the lower side of the drawing with respect to the air flow path member 5. The air channel member 5 is buried in the position. Therefore, the space on the tip side of the top surface 30 of the flame hole member 3 is partitioned by the walls of the two air flow path members 5. In the present embodiment, the space surrounded by the top surface 30 of the flame hole member 3 and the two air flow path members 5 functions as the first combustion portion 46.

Next, the function of the combustion apparatus 1 will be described.

A large number of combustion apparatuses 1 are arranged in a box (not shown) and are blown by a blower 41 on the lower side of the drawing. The fuel gas is introduced from the gas inlet 43 of the premixing member 2 through the nozzle 42.

First, the flow of air will be described. The flow of the blast is indicated by a thin line in the drawing. The blown air generated by the blower 41 is rectified by the opening 45 of the rectifying plate 44 and enters the inside of the combustion device 1 from the base end portion (lower side of the drawing) of the combustion device 1.

There are three routes for blowing air into the combustion device 1. That is, the first route is a route that passes through the air flow path member 5, and the air flow enters the air flow path member 5 from the air introduction opening 15 provided at the base end of the air flow path member 5, and the internal air flow It flows right above the road 13 by directing it toward the tip. And most of the air is discharged to the outside through the tip openings 20, 21.

A part of the air flowing through the air flow path member 5 is also discharged from the air discharge opening 23 for the combustion section and the air discharge opening (upstream air discharge opening) 48.

The air discharged from the air discharge opening 23 for the combustion section is discharged from the inclined surface 22 of the step section with a force directed obliquely forward with respect to the axis of the combustion apparatus 1.

The air discharged from the air discharge opening (upstream air discharge opening) 48 flows through the gap 40 between the air flow path member 5 and the intermediate member 6 and reaches the side surface portion of the flame hole member 3. [0054] The second route is a route flowing through the intermediate member 6. That is, the intermediate member 6 has a force between the opening row portion 10 and the flame hole member 3 in which the opening row portion 10 of the premixing member 2 is sandwiched between the side wall portions 31 and 32 of the flame hole member 3. There is a gap between them, and a part of this gap opens to the lower side of the intermediate member 6.

Therefore, air enters between the opening 28 between the premixing member 2 and the side wall portions 31 and 32 of the flame hole member 3.

This air flows through the gap between the side wall portions 31 and 32 and the opening row portion 10 and enters the mixing space 39. Subsequently, the gas flows into a space 47 between the opening row portion 10 and the top surface 30 portion of the flame hole member 3. That is, the air described above flows through the flame hole upstream side flow passage 49. Then, it is discharged from the slit as the flame hole 33 to the first combustion section 46. Part of the air that has entered the space 47 enters the gap 29 between the main body member 25 and the side wall portions 31 and 32 from the opening 35 provided in the side wall portion of the main body member 25, and the first through the side opening 27. Released to the combustion section 46.

[0055] Next, the third route of air will be described. The third route is a route for primary air, which is introduced from the gas inlet 43 of the premixing member 2 together with the fuel gas. Since the third route is the same as the route through which the fuel gas flows, the following is described as the fuel gas flow. The flow of fuel gas is illustrated by solid arrows.

[0056] Fuel gas is introduced from the gas inlet 43 of the premixing member 2 together with the primary air. The fuel gas is mixed with air in the mixing section 7 and the like, and flows into the opening row section 10. In the opening row portion 10, since a large number of openings 8 are arranged in a straight line, the fuel gas that has entered the opening row portion 10 is evenly discharged from each opening 8. The fuel gas discharged from the opening 8 of the opening row portion 10 enters the mixing space 39 formed between the side wall portions 31, 32 of the flame hole member 3 and the opening 8 of the opening row portion 10, and flows upstream of the flame hole. Mixed with air flowing through the passageway (including the mixing space 39) 49. Here, the air flowing through the flame hole upstream side flow path (including the mixing space 39) 49 flows in the height direction of the combustion device 1 (the lower force is also upward), whereas from the opening 8 of the opening row portion 10 The released fuel gas flows in a direction perpendicular to the air flow. Therefore, the fuel gas discharged from the opening 8 of the opening row portion 10 collides violently with the air even in the mixing space 39, and the mixing with the air is promoted. Further, since the mixing space 39 communicates over the entire longitudinal direction of the opening row portion 10, the pressure is also smoothed. [0057] The force of the fuel gas passing through the mixing space 39 and flowing into the space 47. During this time, the mixing of the fuel gas and air is promoted. After that, the flow is the same as the flow in the flame hole upstream flow path 49 described above, and enters the space 47 between the opening row portion 10 and the top surface 30 portion of the flame hole member 3, and many portions are in the flame hole 33. It is discharged from the slack slit to the first combustion section 46. Part of the air that has entered the space 47 enters the gap 29 between the decompression wall 26 and the side walls 31 and 32 from the opening 35 provided in the side walls 31 and 32 of the main body member 25, and the side opening 27 To the first combustion section 46.

The fuel gas discharged from the flame hole 33 is mixed with air in the premixing member 2 and further mixed with air in the mixing space 39, so that the fuel gas is homogeneous and is released from the flame hole 33. The speed is also uniform.

However, although the fuel gas released from the flame hole 33 is mixed with air, the amount of air is less than the theoretical amount of air! The fuel gas released from the flame hole 33 is in an air-deficient state and cannot be burned completely!

[0058] When the fuel gas is ignited, the fuel gas generates a primary flame in the first combustion unit 46, and primary combustion is performed. However, since the fuel gas is in an air-deficient state as described above, it cannot be completely burned, and many unburned components are produced.

Unburned components are released outside the opening force of the first combustion section 46. Here, air is also supplied to the outside of the first combustion section 46 as the force at the tip of the air flow path member 5. For this reason, the unburned component is supplied with oxygen and undergoes secondary combustion. That is, the area outside the first combustion part 46 functions as a second combustion part, and a secondary flame is generated.

[0059] In this embodiment, air is supplied to the base end portion of the primary flame, and flame holding occurs at the base end portion of the primary flame.

In the present embodiment, the fuel gas is not only released from the flame hole 33 that is the “center opening”, but also released from the side opening 27 to the first combustion section 46. However, the flow rate of the fuel gas emitted from the side opening 27 is slower than the fuel gas emitted from the flame hole 33 which is the “center opening”. That is, the fuel gas enters the gap 29 between the decompression wall 26 and the side walls 31, 32 from the opening 35 provided in the side walls 31, 32 of the main body member 25, and enters the first combustion section 4 6 from the side opening 27. To be released. Therefore, the amount of fuel gas entering the gap 29 is limited, and the side opening 27 The amount released from is small. On the other hand, since the side opening 27 has a large opening area, the fuel gas discharged from the side opening 27 has a low flow velocity.

Further, as described above, a partial force of the air passing through the air flow path member 5 is formed between the air flow path member 5 and the intermediate member 6 from the air discharge opening (upstream air discharge opening) 48. It is discharged into the gap 40 and reaches the side surface of the flame hole member 3 through the gap 40. For this reason, the side surface portion of the flame hole member 3 is rich in oxygen compared to other parts, and the fuel gas released from the side surface side opening 27 is supplied with air and burns relatively stably.

As described above, in combination with the low flow rate of the fuel gas, stable flame holding occurs in the vicinity of the side opening 27. Therefore, the base end of the primary flame is held by a small flame generated near the side opening 27.

[0061] Further, in the present embodiment, the secondary flame is stabilized by the air discharged from the combustion part air discharge opening 23. That is, in the present embodiment, there is an inclined surface 22 in the front and back surfaces 11 and 12 of the air flow path member 5 and corresponding to the base end portion of the first combustion portion, and the air discharge opening for the combustion portion is formed on the inclined surface 22. Since 23 is provided, air is supplied from the base end portion of the first combustion section in an oblique direction with respect to the air traveling direction. Therefore, the supplied air is supplied into the first combustion section 46 that does not obstruct the flow of the primary flame and unburned gas. As a result, a part of the unburned gas in the first combustion section 46 starts to burn, and a secondary flame is generated in a part. And since this secondary flame is connected to the external secondary flame, the secondary flame generated outside is also stable.

Further, in this embodiment, the air discharge opening 23 for the combustion section opens in an oblique direction and does not hinder the flow of the primary flame and unburned gas as described above. Therefore, the secondary flame is removed from the air flow path member 5. It occurs at a distant position and should not overheat the air flow path member 5.

Therefore, the combustion apparatus of the present embodiment is practical because both the primary flame and the secondary flame are stable.

Next, a more practical configuration example of the present invention will be described with reference to FIG. 2 and subsequent drawings. The embodiments described below are practically designed to implement the present invention and are the most recommended configurations.

The basic configuration and basic functions of the combustion apparatus shown in the drawings after FIG. 2 are as described above. Same as the example, but with practical details in the details. Members having the same functions as those of the previous embodiment are denoted by the same symbols, and description of overlapping functions will be simplified.

A combustion apparatus 1 shown in FIG. 2 is used in parallel with a case 54 as shown in FIGS. The combustion apparatus 1 of the present embodiment also includes a premixing member 2, a flame hole member 3, and an air flow path member 5. The premixing member 2 and the flame hole member 3 are fitted together to form one intermediate member 6, and the intermediate member 6 is sandwiched between the two air flow path members 5. .

[0064] The shape of the premixing member 2 is as shown in Figs. The premixing member 2 is formed by pressing a single steel plate to form a developed figure having irregularities on the surface, bending it, and then joining the periphery by spot welding. Spot welding is performed at the surrounding flange 51.

[0065] The shape of the premix member 2 after assembly is such that a front plate 52 as shown in FIGS. 8 and 9 and a symmetrical back plate 53 are superimposed on each other. The external appearance of the premixing member 2 has a sharp shape, has a flat top 50, and is closed so that gas does not leak out.

A series of gas flow paths are formed between the front plate 52 and the back plate 53 inside. That is, in the portion where the unevenness of the front plate 52 and the back plate 53 coincides, the metal plates are arranged in a gap, and a gas flow path is formed by this gap.

In the premixing member 2 employed in the present embodiment, the gas flow path is largely divided into upper and lower parts as shown in FIG. Specifically, the gas flow path is roughly composed of a mixing flow path 19 and an opening row portion 10.

The mixing channel 19 is located on the lower side of the premixing member 2 as shown in FIG. 9, and is a channel from the inlet of the gas channel to the opening row portion 10. Explaining from the inlet of the gas flow path, a gas inlet 43 is opened at the lower corner of the combustion apparatus 1 as shown in FIG. Inside the gas introduction port 43, there is a constricted part 55 whose sectional area is temporarily constricted, and on the downstream side there is a diameter-expanded part 56 whose sectional area gradually increases. After that, the uniform cross section 57 has a uniform cross-sectional area. The flow path is linear from the gas inlet 43 to the uniform cross section 57 through the throttle 55 and the enlarged diameter portion 56. The end of the uniform cross section 57 is connected to the opening row portion 10 with the flow path bent vertically. In the present embodiment, there is no portion that serves as a stop immediately before the opening row portion 10.

[0067] The opening row portion 10 is located at the upper end portion of the premixing member 2, and extends over the entire lengthwise direction as shown in FIG. The cross-sectional area of the opening row portion 10, in other words, the gap between the front plate 52 and the back plate 53 at that portion is large as shown in FIGS.

The cross-sectional shape of the opening row part 10 is a two-stage shape as shown in FIGS. 10 and 11, and the top side is a narrow area part 58, and the cross-sectional area is slightly narrow.

That is, the cross-sectional shape of the opening row portion 10 will be described. The top portion 50 is flat, and both side forces of the top portion 50 also have the upper vertical wall 81 vertically. The end of the vertical wall 81 is connected to the inclined wall and spreads slightly outside. Furthermore, the end of the inclined wall is a lower vertical wall 82.

[0068] On the outer surface of the opening row portion 10, which is the narrow area portion 58, a large number of openings 8 are provided on both the front plate 52 and the back plate 53, respectively. The openings 8 are arranged in a line along a straight line with a certain interval.

In this embodiment, the opening 8 is provided only on the front side and the back side of the opening row portion 10, and the top portion 50 has no opening.

Next, the air flow path member 5 will be described with reference to FIGS. The air flow path member 5 is also formed by pressing a single steel plate to form a developed figure having irregularities on the surface, bending it, and then joining it by spot welding. In the air channel member 5, the front and back surfaces 11 and 12 are joined with a slight gap as shown in FIG. 8, and a gap serving as the air channel 13 is provided inside.

The air flow path member 5 has a sharp bent portion at the tip, and the apex 9 is formed by the bent portion. The top 9 extends in a ridgeline.

As shown in FIG. 12, the air flow path member 5 is provided with flange portions 83 on two sides in contact with the bent portion, and the flange portions 83 are spot-welded.

On the base end side of the air flow path member 5, the space between the front and back plates 11, 12 is opened as shown in FIG. 8, and an air introduction opening 15 is formed.

[0070] The appearance of the air flow path member 5 is a thin wall as shown in FIG. The air flow path member 5 is roughly divided into three regions with respect to the height direction based on the vertical position as shown in FIG. Yes.

In other words, the introduction force 60 is up to a height of about 1Z3 in the base end force. Further, the region of about 1Z3 in the height direction is the intermediate portion 61. The region of about 1Z3 on the front end side is the first combustion portion constituting portion 62.

[0071] The air flow path member 5 constitutes a flow path from the air introduction opening 15 toward the front end side, and the cross-sectional area of the flow path becomes narrower toward the front end side.

In other words, the section (introduction portion 60) from the air introduction opening 15 to the total height of about 1Z3 has a substantially constant sectional area as shown in FIG. In other words, as shown in the cross-sectional view of FIG.

[0072] The intermediate portion 61 is generally tapered.

That is, the intermediate portion 61 has a taper shape in which the interval is narrowed as the lower portion widens and the upward force is applied as shown in the figure. However, a bulging portion 84 is provided at a boundary portion between the distal end side end portion of the taper and the first combustion portion constituting portion 62. The outer wall portion constituting the bulging portion 84 has parallel front and back portions.

[0073] Although the cross-sectional area of the first combusting part constituting part 62 is substantially constant (except for the top part 9), the cross-sectional area per unit length during this period is about 1Z3 compared to that of the introducing part 60.

Between the first combustion part constituting part 62 and the intermediate part 61, there is a step part composed of the inclined surface 22.

[0074] The air flow path member 5 is provided with air discharge openings in three regions.

The position where the air discharge opening is provided is roughly divided into a front end portion, a position facing the first combustion portion, and a position facing the intermediate member 6.

That is, the front end portions of the front and back surfaces 11 and 12 of the air flow path member 5 are bent in a mountain shape, and inclined surfaces 16 and 17 are formed on the front surface side and the back surface side. The inclined surfaces 16 and 17 are provided with a circular tip opening 20 as shown in FIG. In addition, a circular front end opening 21 is provided at the most advanced portion (ridge portion).

Further, in the present embodiment, slit-shaped tip openings 63 and 64 are provided on the top and the inclined surfaces 16 and 17. There are two types of slit lengths: the smaller slit-shaped tip opening 63 is a slit that connects all the inclined surfaces 16 and 17 and the top 9. The larger slit 64 (opening at the tip) has a longer top and bottom surface force where the front and back surfaces 11, 12 are parallel. Has reached.

[0076] The size of the slit (tip opening) 64 is smaller and the number of slits (tip opening) 63 is larger than that of the slit (tip opening) 63, and two or three rows of large slits 64 are provided in succession. Further, subsequently, two or three rows of large slits 64 are continuously provided, and these are continuously provided over the entire length direction of the air flow path member 5.

The circular tip openings 20, 21 described above are provided between the slits (tip openings) 63, 64.

[0077] The tip openings 20, 21 are provided for supplying secondary air to the secondary flame, as in the previous embodiment.

In addition, a combustion portion air discharge opening 23 is provided on the inclined surface 22 between the first combustion portion constituting portion 62 and the intermediate portion 61 described above. The air discharge opening 23 for the combustion section supplies secondary air to the primary flame of the first combustion section 46 and burns part of the primary flame to generate a secondary flame in part. .

[0079] Further, 48 air discharge openings (upstream air discharge openings) 48 are also provided in the vicinity of the boundary between the introduction section 60 and the intermediate section 61. The air discharge opening (upstream air discharge opening) 48 supplies air to the side surface portion of the flame hole member 3 to stabilize the flame holding.

[0080] The front and back surfaces 11 and 12 of the air flow path member 5 are provided with uneven shapes in each part for the purpose of providing a gap between them or for providing a gap between other members. .

To explain sequentially, a plurality of concave grooves 70, 71 extending in the height direction are provided on the wall surface constituting the first combustion portion constituting portion 62 on the front end side. Each of the concave grooves 70 and 71 has a concave shape when viewed from the surface side force, and extends in the height direction. The groove 70 is shorter than the groove 71. The concave grooves 70 and 71 are both arranged in parallel. The concave grooves 70 and 71 are provided mainly for reinforcing the plate.

In the present embodiment, a plurality of short concave grooves 70 are provided, followed by a long concave groove 71, and a plurality of short concave grooves 70 are provided. Grooves 70 and 71 are arranged.

[0081] The distance between the long concave grooves 71 is wider than the distance between the other concave grooves.

And between the long concave grooves 71 and in the vicinity of the base end portion of the concave grooves 71, there are FIGS. A streamlined concave change portion 72 such as 3 is provided. The concavely deformed portion 72 has a concave shape as viewed from the front side. Specifically, the concave portion 72 has a shape in which a large circle and a small circle are arranged apart from each other and connected by a common tangent, and the large circle side is located upstream of the air flow path. However, the small circle side is located downstream of the air flow path. The line connecting the centers of the two circles is parallel to the air flow direction. The common tangent line connecting the two circles has an inclination of 30 ° or less with respect to the line connecting the centers of the circles.

[0082] In the intermediate portion 61 of the air flow path member 5, six ridges 73 are provided as shown in FIG. The direction of the ridge 73 is parallel to the air flow direction. As will be described later, the ridge 73 is in contact with the outer surface of the intermediate member 6 to provide a gap therebetween, and the position of the protrusion (ridgeline) of the ridge 73 (from the center line of the air flow path member 5) Are equal in any part. That is, as described above, in the intermediate portion 61, the cross-sectional shape of the flow path is tapered, but the height of the ridge 73 (the size of the protrusion) changes to a reverse tapered shape, and the positions of the protruding end portions are aligned. ing.

[0083] A plurality of concave grooves 75 are also provided in parallel in the introduction portion 60 of the air flow path member 5. Each of the concave grooves 75 extends from the proximal end side of the air flow path member 5 to the distal end side. The concave groove 75 has a concave shape when viewed from the front side.

A concave groove 77 extending in the lateral direction (perpendicular to the air flow) is provided in the vicinity of the introduction portion 60 of the air flow path member 5.

The concave groove 77 is provided mainly for positioning.

Further, when the eyes are moved to the side surface portion of the air flow path member 5, a substantially triangular projection 80 is provided at the center portion of both side surfaces.

Next, the flame hole member 3 will be described. The flame hole member 3 is formed by welding a decompression wall 26 to the side surface of the main body member 25 as shown in FIGS.

The body member 25 of the flame hole member 3 is also formed by pressing a single steel plate to form a developed figure having irregularities on the surface, bending it, and spot welding. As shown in FIG. 14, the main body member 25 also has flanges 85 on two sides connected to the top surface 30, joined by the flange 85, and the surface facing the top surface 30 is released.

[0087] The main body member 25 of the flame hole member 3 has a top surface 30 that functions as a flame hole as shown in FIGS. 8 and 14, and two side wall portions 31, 32 that are bent at about 90 ° at both ends. ing. Top of flame hole member 3 The surface 30 is elongated and has an elongated shape. The top 30 has a roof shape, and the central ridgeline 86 is the highest, and both sides are gently inclined walls 87.

The flame hole member 3 is a force obtained by bending a steel plate as described above.

6, the steel plate is folded. Therefore, the folded part hangs down as a vertical wall 88 in the internal cavity as shown in the figure.

The top surface 30 of the main body member 25 is provided with a slit-like opening serving as a flame hole (center side opening) 33. The slit (flame hole 33) extends in the width direction of the top 30. A plurality of slit-shaped openings are arranged in parallel, and are provided in the entire longitudinal direction of the top 30. And figure

As shown in FIG. 14, the flame hole group 89 is configured by combining a plurality of slit-shaped openings, and the flame hole group 89 is arranged on the top surface 30 at regular intervals.

[0089] When attention is paid to the cross-sectional shape of the main body member 25, the main body member 25 has two narrowed portions as shown in FIG.

There are 78, 79. In other words, there are two bulges 90 and 91 except for the base end.

That is, there are a tip side bulging portion 90 including the portion of the top surface 30 and an intermediate bulging portion 91 provided in the middle portion. Then, the distal end side restricting portion 7 is interposed between the intermediate bulging portion 91 and the distal end side bulging portion 90.

There are eight. Further, a proximal end side throttle portion 79 is provided on the proximal end side of the intermediate bulging portion 91.

[0090] Among the bulging portions 90 and 91 and the throttle portions 78 and 79 described above, the tip-side bulging portion 90 and the intermediate bulging portion

90 are provided over the entire width of the flame hole member 3.

Further, openings 35 are provided in a row on the side surface of the distal side bulging portion 91 as shown in FIG. The opening 35 is a small hole.

The proximal end side throttle portion 79 is provided with a plurality of ridges 92 as shown in FIG. The ridge 92 is

Also, the surface side force is seen to protrude outward, and a groove 93 is formed inside as shown in FIG. The ridge 92 extends in the height direction of the flame hole member 3. The ridge 92 extends in parallel with the width direction of the flame hole member 3.

[0091] The open ends of the side walls 31, 32 are folded back by about 90 ° twice as shown in Figs. 6, 8, 16, and 17, and a fitting concave groove 38 is formed on the outside. The bottom wall 36 of the fitting groove 38 is a side wall portion.

The outer wall 37 of the fitting groove 38 is parallel to the side walls 31 and 32.

The outer wall 37 constituting the fitting groove 38 has a substantially trapezoidal front shape. That is, both of the outer wall 37 The side edge is inclined as shown in the enlarged view of FIG. 15, and the tip side is tapered in a tapered shape. Further, as shown in FIGS. 16 and 17, projections 95 are provided on the side wall portions 31 and 32 in the fitting groove 38. The positions of the protrusions 95 are at both ends of the concave groove 38 for fitting, and one protrusion 95 is provided at each end.

The decompression wall 26 is fixed to the upper end portions of the side wall portions 31 and 32 of the main body member 25. The decompression wall 26 is in the form of a long plate as shown in FIG. 14, and covers the tip-side bulged portion 90 of the main body member 25 over the entire area. There is a gap 29 between the side wall portions 31 and 32 of the main body member 25 and the decompression wall 26. The air gap 29 is open on the upper side of the drawing. This opening functions as the side opening 27. As shown in FIG. 8, there is a small protrusion 97 on the inner surface of the pressure reducing wall 26, and the protrusion 97 is in contact with the main body member 25 to regulate the distance between the side opening 27.

As described above, the distal-side bulged portion 90 has the openings 35 (FIG. 14) in a row, and the openings 35 communicate the inner surface of the main body member 25 with the gap 29.

[0094] Both end portions of the main body member 25 are overlapped with the side wall portions 31 and 32 to form a flange 85, and are joined by spot welding. However, between the proximal end side and the vicinity of the intermediate bulging portion, There is a slit 98 between the side walls 31, 32.

Next, the relationship between the members will be described with reference to FIGS.

Also in the combustion apparatus of the present embodiment, the premixing member 2 and the flame hole member 3 are fitted together to constitute the intermediate member 6.

The flame hole member 3 (intermediate member 6) is located between the two air flow path members 5 as described above. However, the top surface 30 of the flame hole member 3 is higher than the upper end of the air flow path member 5. Located on the lower side of the drawing and in a position buried between the air flow path members 5. Therefore, the space on the front end side of the top surface 30 of the flame hole member 3 is partitioned by the walls of the two air flow path members 5. In the present embodiment, the space surrounded by the top surface 30 of the flame hole member 3 and the two air flow path members 5 functions as the first combustion portion 46.

The intermediate member 6 is obtained by mounting the premixing member 2 on the flame hole member 3, and the top 50 side of the premixing member 2 is inserted into the hollow portion of the flame hole member 3. At this time, the flange portions 51 at both ends of the premixing member 2 are fitted into the slits 98 formed at both ends of the flame hole member 3. Then, the protruding end of the premixing member 2 and the back end of the slit 98 come into contact with each other, and positioning in the insertion direction is performed. Yes.

Further, the vertical wall 82 provided on the lower side of the opening row portion 10 of the premixing member 2 is brought into contact with the inner wall of the base end side throttle portion 79 of the flame hole member 3 so as to be positioned in the thickness direction.

The narrow area portion 58 of the opening row portion 10 of the premixing member 2 is the position of the intermediate bulging portion 91 of the flame hole member 3.

[0097] When attention is paid to the gap between the opening row portion 10 of the premixing member 2 and the flame hole member 3, the opening row portion is formed in the intermediate bulging portion 91 of the side wall portions 31, 32 of the flame hole member 3 as described above. There are 10 narrow areas 58. That is, the portion of the intermediate bulging portion 91 corresponds to the row portion of the opening 8 of the opening row portion 10. Accordingly, the outside of the opening 8 of the opening row portion 10 is separated from the side wall portions 31 and 32, and a wider space (mixing space) 39 is formed outside the opening 8 than the others. This mixing space 39 communicates over the part corresponding to all the openings 8.

On the other hand, as described above, the lower side of the opening row portion 10 of the premixing member 2 is in contact with the inner wall of the base end side throttle portion 79 of the flame hole member 3. For this reason, the outer wall of the opening row portion 10 and the inner wall of the flame hole member 3 are in contact with each other at almost all positions in the width direction, and there is no gap. However, as described above, the plurality of protruding ridges 92 are provided in the base end side restricting portion 79, and the inner surface side of the protruding ridges 92 is a concave groove 93 (FIG. 6). Therefore, in the portion of the ridge 92, the outer wall of the opening row portion 10 and the inner wall of the flame hole member 3 are separated. Further, since the ridge 92 extends in the height direction of the flame hole member 3, the mixing space 39 communicates with the base end side of the flame hole member 3.

Here, when attention is paid to the positional relationship between the position of the ridge 92 and the opening 8 provided in the opening row portion 10 of the premixing member 2, the opening is formed at a position directly above the ridge 92 as shown in FIG. There are eight. That is, when the ridge 92 is extended, it intersects with the position of the opening 8. In the present embodiment, as shown in FIG. 18, the ridge 92 and the opening 8 correspond one-to-one. However, as shown in Fig. 19, the number of openings 8 is more powerful, and the number of protrusions 92 is more! Well ...

[0100] There is a gap between the base end of the flame hole member 3 and the premixing member 2. Therefore, the above-described mixing space 39 communicates with the outside through the ridge 92 (concave groove 93) and the gap between the proximal ends.

On the other hand, when attention is paid to the further front end side of the mixing space 39, a relatively large space 47 is formed between the side wall portions 31, 32 and between the top portion 50 of the opening row portion 10 and the top surface 30 portion of the flame hole member 3. There The In the present embodiment, the flame hole upstream flow path 49 is formed by the mixing space 39 and the space 47 downstream of the opening row portion 10.

[0101] Air flow path members 5 are mounted on both sides of the intermediate member 6 as shown in Figs. The air flow path member 5 is fixed to the intermediate member 6 by fitting the fitting concave groove 38 of the flame hole member 3 into the air introduction opening 15 on the proximal end side. That is, the outer wall 37 of the fitting groove 38 is inserted into the air introduction opening 15, and the projecting end of the air flow path member 5 is inserted into the fitting groove 38 and brought into contact with the bottom wall 36 of the fitting groove 38.

As described above, the outer wall 37 of the concave groove for fitting 38 has a trapezoidal shape with the frontal force seen, and both sides have a tapered shape. Therefore, when the air flow path member 5 is mounted, the air introduction opening 15 The inner wall follows the taper of the outer wall 37 of the concave groove 38 for fitting, and positioning in the width direction is performed. When the air flow path member 5 is in a normal position with respect to the flame hole member 3, as shown in FIG. 17, a fitting groove 38 is formed on the outer upper end of the groove 77 provided in the vicinity of the opening of the air flow path member 5. The protrusion 95 provided inside engages, and a feeling of moderation called “force” is obtained.

Further, when the air flow path member 5 is mounted at the proper position, as shown in FIG. 24, the air discharge opening 23 for the combustion part is formed in the width direction with the flame hole group 89 and the flame hole group 89 of the flame hole member 3 It will be located between.

At the upstream end (the lower end in the drawing) of the combustion apparatus 1, the gap 40 between the air flow path member 5 and the intermediate member 6 is sealed by the bottom wall 36 of the fitting groove 38. Accordingly, the gap 40 between the air flow path member 5 and the intermediate member 6 does not directly communicate with the outside world on the base end side.

[0102] When attention is paid to the gap 40 between the air flow path member 5 and the intermediate member 6 (flame hole member 3), the side surface side of the upstream air discharge opening 48 of the air flow path member 5 as shown in FIGS. Is located at the front end side throttle portion 78 of the flame hole member 3. Since the front-side throttle portion 78 is a portion where the surface of the flame hole member 3 is recessed, there is a gap between the air flow path member 5 and the flame hole member 3 in the vicinity of the upstream air discharge opening 48.

Further, this gap communicates with the first combustion section 46. That is, the air flow path is tapered on the tip side of the upstream air discharge opening 48 of the air flow path member 5, and the outer wall of the air flow path member 5 becomes closer to the downstream side of the air flow path. There is a gap between the flame hole member 3 Arise. The outer wall of the air flow path member 5 and the flame hole member 3 are partially in contact with each other by a ridge 73 provided on the air flow path member 5.

[0103] Next, the function of the combustion apparatus 1 will be described.

A large number of combustion apparatuses 1 are arranged in a case 54 as shown in FIG. 3, and the lower side force of the drawing is also blown by the blower 41 as shown in FIG. 4. Fuel gas is introduced from the gas inlet 43 of the premixing member 2 by a nozzle (not shown).

The flow of the air flow is substantially the same as in the above-described embodiment, and the air flow generated by the blower 41 is rectified by the opening of the rectifying plate 44 (FIG. 4), and the base end portion (lower side of the drawing) of the combustion apparatus 1 It enters the combustion device 1 from the inside.

The route of the air blown into the combustion device 1 is the same as the previous embodiment, and there are 3 routes. That is, the first route is a route passing through the air flow path member 5 as shown in FIG. 6, and the air flow enters the air flow path member 5 from the air introduction opening 15 provided at the base end portion of the air flow path member 5. Then, it flows through the internal air flow path 13 toward the tip side. Most of the air is discharged to the outside through the tip openings 20 and 21.

Here, in this embodiment, as shown in FIG. 20, the tip shape of the air flow path member 5 has an acute angle, and the tip opening 63, 64 of the tip opening has inclined surfaces 16, 17. Therefore, it is difficult for air to stay at the tip or to generate turbulence. For example, as shown in FIG. 21, if the tip shape of the air flow path member 5 is circular, the air introduced from the air introduction opening 15 collides with the arc surface that is the ceiling surface, and the base end side along the arc surface. Go around. Then, the sneak-in air collides with the newly supplied air flow as shown by the arrow, and inhibits the release of the newly supplied air to distort the discharge direction. If the tip shape of the air flow path member 5 is made circular in this way, the direction of the air flow becomes unstable due to the generation of turbulence and vortices. For this reason, a problem that the secondary flame fluctuates occurs. Further, according to the experiments by the present inventors, there is a problem that the noise is high.

[0105] In contrast, in the present embodiment, as shown in FIG. 20, the tip portion has an acute angle, so that there are few parts where the supplied air collides and there is less air wraparound. Since the slit-shaped opening is provided on the inclined surface, most of the air that collides with the inclined surface is released to the outside through the slit-shaped opening. Therefore, the direction of air release is stable and the fluctuation of the secondary flame is small. Become. Noise is also reduced. However, the present invention does not limit the tip shape of the air flow path member, and the tip shape as shown in FIG. 21 may be circular.

Returning to the description of the embodiment, in the combustion apparatus 1 of the present embodiment, a part of the air flowing through the air flow path member 5 is divided into the air discharge opening 23 for the combustion section and the air discharge opening (upstream air discharge). Aperture) 48 is also emitted.

The air discharged from the air discharge opening 23 for the combustion part is directed to the axis of the combustion apparatus 1 from the inclined surface 22 of the step part between the flame hole group 89 and the flame hole group 89 of the flame hole member 3. On the other hand, it is released diagonally forward.

The air discharged from the air discharge opening (upstream air discharge opening) 48 flows through the gap 40 between the air flow path member 5 and the intermediate member 6 and reaches the side surface portion of the flame hole member 3. Specifically, the air discharged from the air discharge opening (upstream air discharge opening) 48 is discharged into a gap formed by the front end side throttle portion 78 of the flame hole member 3. Then, this air flows through a gap formed by the tapered wall surface of the air flow path member 5 and is released to the side surface portion of the flame hole member 3.

The second route is a route that flows through the intermediate member 6, and air enters between the premix member 2 and the side wall portions 31, 32 of the flame hole member 3 from the opening 28.

This air passes through the concave groove 93 formed on the inner surface of the flame hole member 3 (the back side of the ridge 92) and enters the mixing space 39. Then, it enters the space 47 between the opening row portion 10 and the top surface 30 portion of the flame hole member 3. That is, the above-described air flows through the flame hole upstream side flow path 49. Then, it is discharged to the first combustion section 46 through a slit which is a flame hole (center side opening) 33. Part of the air that has entered the space 47 enters the gap 29 between the main body member 25 and the side wall portions 31 and 32 through the opening 35 provided in the side wall portion of the main body member 25, and the first through the side opening 27. Released to the combustion section 46.

Next, the third route of air will be described. The third route is a route for primary air, which is introduced from the gas inlet 43 of the premixing member 2 together with the fuel gas. Since the third route is the same as the route through which the fuel gas flows, the following is described as the fuel gas flow. The flow of fuel gas is illustrated by solid arrows.

Fuel gas is introduced together with primary air from the gas introduction port 43 of the premixing member 2, mixed with air in the mixing unit 7 and the like, and flows into the opening row unit 10. Here, in this embodiment, the mixing unit 7 There is no portion that becomes a diaphragm between the uniform cross section 57 and the opening row portion 10. Therefore, the fuel gas enters the opening row portion 10 without protruding portions having different flow velocities.

The fuel gas that has entered the opening row 10 is evenly discharged from each opening 8. That is, since the opening row portion 10 has a considerable internal volume, minute vortices generated in the curved path of the premixing member 2 are converged. Further, as described above, the fuel gas introduced into the opening row portion 10 having no portion to be throttled immediately before the opening row portion 10 has a small variation in flow velocity in the cross section of the flow path. Therefore, the fuel gas with little pressure variation inside the opening row 10 is discharged uniformly from each opening 8. The diameter of the opening 8 may be decreased sequentially so that the amount of the gas to be discharged is uniform.

[0110] The fuel gas released from the opening 8 of the opening row portion 10 enters the mixing space 39 constituted by the intermediate bulging portion 91 of the flame hole member 3, and flows into the flame hole upstream flow path (mixing space 39). Mixed with air flowing through 49).

On the other hand, the air flowing through the mixing space 39 flows upward from the lower side of the drawing and is conditioned.

That is, the air flowing into the mixing space 39 is introduced from the opening 28 between the premixing member 2 and the side wall portions 31 and 32 of the flame hole member 3 before reaching the mixing space 39. Since it passes through the concave groove 93 (the back side of the ridge 92) formed on the inner surface of the flame, it is a laminar flow. In more detail, in this embodiment, the base end side throttle of the flame hole member 3 In the portion 79, most of the portions are in contact with the outer wall of the premixing member 2, but a large number of concave grooves 93 are formed on the inner surface of the proximal end side throttle portion 79. There is a gap. Each concave groove 93 communicates with the mixing space 39. Therefore, the air introduced from the opening 28 between the side walls 31 and 32 passes through the plurality of concave grooves 93 and reaches the mixing space 39. The recessed grooves 93 are elongated channels and are provided at equal intervals and in parallel, so that the introduced air is rectified by flowing through the plurality of recessed grooves 93.

[0112] The air flowing through the flame hole upstream side flow path (including the mixing space 39) 49 flows in the height direction of the combustion device 1, whereas the fuel gas discharged from the opening 8 of the opening row 10 is air. It flows in the direction perpendicular to the flow of. Therefore, the fuel gas released from the opening 8 of the opening row portion 10 collides violently with the air even in the mixing space 39, and the mixing with the air is promoted. In addition, in this embodiment, since the opening 8 of the opening row portion 10 is on the extension line of the groove 93 (the back side of the ridge 92), the air that has exited the groove 93 is more reliably released from the opening 8. Collide with gas.

Further, since the mixing space 39 communicates over the entire longitudinal direction of the opening row portion 10, the pressure is also smoothed.

[0113] The fuel gas rises through the mixing space 39 and flows into the space formed by the tip-side bulging portion 90, but mixing of the fuel gas and air is also promoted during this time. Most of the fuel gas is discharged from the slit serving as the flame hole 33 to the first combustion section 46.

The fuel gas discharged from the slit is mixed with air in the premixing member 2 and further mixed with air in the mixing space 39, and is uniform, and the speed when discharged from the slit is also uniform. It is.

Part of the air that has entered the space 47 enters the air gap 29 between the main body member 25 and the side wall portions 31 and 32 from the opening 35 provided in the side wall portion of the main body member 25, and the first through the side opening 27. Released to the combustion section 4 6.

[0114] When the fuel gas is ignited, the fuel gas generates a primary flame in the first combustion section 46, and primary combustion is performed. The unburned component is also released from the opening force of the first combustion section 46 to the outside, and air is supplied from the tip of the air flow path member 5 to undergo secondary combustion.

[0115] In the present embodiment, air is supplied to the base end portion of the primary flame, and flame holding occurs at the base end portion of the primary flame.

That is, in this embodiment, part of the fuel gas is released from the side opening 27 to the first combustion section 46. However, the flow rate of the fuel gas released from the side opening 27 is slower than that of the fuel gas released from the slit. That is, the fuel gas enters the gap 29 between the main body member 25 and the side wall portions 31, 32 from the opening 35 provided in the side wall portion of the main body member 25, and is released from the side surface side opening 27 to the first combustion portion 46. The Therefore, the amount of fuel gas entering the gap 29 is limited, and the amount released from the side opening 27 is small. On the other hand, since the side opening 27 has a large opening area, the fuel gas discharged from the side opening 27 has a low flow velocity.

Further, as described above, the partial force of the air passing through the air flow path member 5 is supplied to the fuel gas discharged from the side surface side opening 27 and completely burns. In other words, the air discharged from the air discharge opening (upstream air discharge opening) 48 is formed by a tapered wall surface of the air flow path member 5 from a gap formed by the tip side throttle portion 78 of the flame hole member 3. It flows along the gap and reaches the side surface of the flame hole member 3.

[0117] As described above, in combination with the low flow rate of the fuel gas, stable flame holding occurs in the vicinity of the side opening 27. Therefore, the base end of the primary flame is held by a small flame generated near the side opening 27.

Also in the present embodiment, air is supplied in an oblique direction from the air discharge opening 23 for the combustion section provided on the inclined surface 22, and a part of the unburned gas in the first combustion section 46 is burned. It starts and a secondary flame is produced in part. This secondary flame is connected to an external secondary flame.

Further, in this embodiment, air is released between the flame hole group 89 and the flame hole group 89 of the flame hole member 3, so that air is sufficiently supplied around the flame hole group 89, and the primary flame is obtained. It is possible to reliably hold the flame.

Also in this embodiment, the air supplied from the air discharge opening 23 for the combustion section is a secondary flame that does not obstruct the flow of the primary flame and unburned gas, and is generated at a position away from the air flow path member 5, Do not heat the air flow path member 5 excessively.

[0119] In the above-described embodiment, a configuration in which an opening for discharging fuel gas is provided on the side surface as an example of the premixing member. According to this configuration, since the fuel gas is released in a direction perpendicular to the air flow, mixing with many opportunities for collision between the fuel gas and air is promoted.

A configuration that emits fuel gas in an oblique direction is conceivable as a configuration that exhibits the same action. For example, as shown in FIG. 22, roof-like inclined surfaces 66 and 67 are provided at the top of the premixing member 2, and slit-like openings 68 are provided in the two inclined surfaces 66 and 67. In this embodiment, the fuel gas is discharged from the slit-shaped opening 68 in an obliquely forward direction. As a result, the fuel gas collides with air and mixing is promoted. Further, according to the present embodiment, the concentration of the fuel gas is stabilized because the fuel gas and air are unlikely to form a vortex.

The combustion apparatus shown in FIG. 23 has a slit-like opening 69 provided at the top of the premixing member. Although it is recommended that the fuel gas be released in a direction that intersects the air flow, the present invention is

It does not exclude structures that discharge along the air flow as shown in Fig. 23.

In the examples shown in FIG. 2 and subsequent figures, a number of uneven shapes are provided on the surface of each member.

The uneven shape fulfills the function of improving the rigidity of the plate body in addition to the function of constituting the flow path. Further, the uneven shape that does not constitute the flow path only fulfills the function of improving the rigidity of the plate.

[0121] In each of the above-described embodiments, a series of flow paths is configured by the gaps between the metal plates.

That is, one or both plates are provided with a recess, and a gap is formed between the other plate. Here, it is one of the design matters to determine which plate is provided with the groove when forming the flow path, and the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, a part of the second route of air has a flow path that passes between the inner surface of the flame hole member 3 and the outer peripheral surface of the premixing member, and the inner surface of the flame hole member 3 is recessed. A groove 93 was provided to secure the flow path. On the contrary, the flow path may be formed by providing a groove or the like on the premixing member side.

Claims

The scope of the claims

[1] A premixing member that premixes fuel gas and air therein, a flame hole member, and an air flow path member, and the premixing member includes an opening row portion in which openings are provided in a row. The air flow path member has a wall shape and has a front air discharge opening on the front end side, and the flame hole member is between two air flow path members or the air flow path member and another wall surface. There is a flame hole upstream flow path between the opening row part and the flame hole member, and a first combustion part is formed by a space surrounded by the flame hole member and the air flow path member, and the air Is supplied to the air flow path member, the flame upstream flow path and the premixing member, the fuel gas is supplied to the premixing member, and the fuel gas is mixed with air in the premixing member, and then the opening row portion The gas is supplied from the opening to the upstream side of the flame hole, mixed with air, and released from the flame hole member to the first combustion section in a state where oxygen is insufficient. A combustion apparatus characterized by being burned by being discharged and further receiving an air supply from a tip air discharge opening of an air flow path member.

[2] The part according to claim 1, wherein there is a mixing space in the vicinity of the opening row portion that is part of the flame hole upstream side flow path, and the opening of the opening row portion opens toward the mixing space. Combustion device.

[3] The combustion apparatus according to claim 1 or 2, wherein the mixing space communicates over substantially the entire area of the opening row portion.

[4] The combustion according to any one of claims 1 to 3, wherein the opening of the opening row portion opens in a direction intersecting with a flow direction of the airflow flowing through the flame hole upstream flow path. apparatus.

[5] The flame hole member has a flame hole forming portion and two side wall portions, and includes an opening portion between the two side wall portions and facing the flame hole forming portion, and an opening row portion of the premixing member. 5. The combustion apparatus according to claim 1, wherein the combustion apparatus is disposed at a position surrounded by the side wall portion, and air is introduced from the opening portion.

[6] The combustion apparatus according to any one of [1] to [5], wherein an air discharge opening for the combustion section that discharges air by urging the first combustion section is provided.

7. The combustion apparatus according to claim 6, wherein the air flow path member has an inclined surface, and an air discharge opening for the combustion section is provided on the inclined surface.

[8] The flame hole member has a plurality of flame hole groups. 8. The combustion apparatus according to claim 6, wherein the combustion apparatus is disposed between the hole group and the flame hole group.

An upstream air discharge opening force S is provided on the upstream side of the portion composing the first combustion part of the air flow path member, and the upstream air discharge opening force is released so that the released air flows to the side surface side of the flame hole member. The combustion apparatus according to any one of claims 1 to 8, wherein the combustion apparatus is characterized.

The flame hole member has a center side opening and a side side opening, and the flow rate of the fuel gas released from the side side opening force is slower than the flow rate of the fuel gas released from the center side opening force. The combustion apparatus according to any one of claims 1 to 9, wherein the combustion apparatus flows in the vicinity of the side opening.

The flame hole member is constituted by a main body part and a decompression wall provided on a side surface of the main body part, a gap is provided between the side surface of the main body part and the decompression wall to constitute a side opening, and the opening is formed in the main body part. 11. The combustion apparatus according to claim 1, wherein a part of the fuel gas that is provided and flows through the main body flows into the gap.

12. The combustion apparatus according to claim 1, wherein the shape of the opening provided in the opening row portion is a slit shape.

13. The combustion apparatus according to any one of claims 1 to 12, wherein the opening row portion has an inclined surface, and an opening is provided in the inclined surface.

14. The combustion apparatus according to claim 1, wherein an inner angle of the opening row portion is 180 ° or less.

The combustion apparatus according to any one of claims 1 to 14, wherein a tip of the air flow path member has an acute ridge shape.