KR100556196B1 - ceramic plate and method for manufacturing thereof and circumference type burner - Google Patents

Abstract

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a ceramic plate, a method for manufacturing the same, and a pole burner, wherein the method for manufacturing a ceramic plate is a method of manufacturing a ceramic plate 56 whose direction in which a hole is enlarged varies depending on a forming position. And a step of forming a hole group that grows in the same direction, and a step of baking while bending and deforming this ceramic material. Therefore, when the pole-type burner is formed of a heat-resistant steel sheet, the temperature distribution in the main direction becomes uniform, but the thermal adjustment range is narrowed. When the pole-type burner is formed of the ceramic plate 56, the thermal adjustment range can be secured. It is possible to solve the problem of not being able to equalize the temperature distribution in the main direction, but at the same time, it is possible to equalize the temperature distribution in the main direction while ensuring a wide thermal control range.

Ceramic plate manufacturing method, electric pole burner, through hole, distribution pipe, opening

Description

Ceramic Plate and Method for Manufacturing Technical and Circumference Type Burner}

1 is a side view of a burner according to an embodiment.

2 is a side view of a distribution tube according to an embodiment.

3 is a perspective view taken along line III-III of FIG. 2.

4 is a schematic perspective view showing a state before combining ceramic plates according to the embodiment.

5 is a schematic perspective view showing a state in which the ceramic plates according to the embodiment are combined.

6 is a perspective view taken along the line IV-IV of FIG. 1.

7 is a schematic structural diagram of a heat exchanger according to an embodiment.

8 is an explanatory diagram of a combustion state of a burner according to the embodiment.

9 is a graph comparing the TDR ranges of the heat resistant steel and the burner made of ceramic according to the embodiment.

10 is a graph comparing the error of the hot water temperature in the burner made of heat-resistant steel and ceramic according to the embodiment.

11 is a schematic perspective view of a state of roller-forming a ceramic material according to the embodiment.

12 is a cross-sectional view of the ceramic material according to the embodiment in the lower mold.

It is sectional drawing of the state which mounted the pressure plate in the ceramic material set to the lower mold | type which concerns on an Example.

It is sectional drawing of the state which set the upper mold | type to the lower mold | type which concerns on an Example.

15 is a cross-sectional view of a state in which the upper mold according to the embodiment is lowered.

Fig. 16 is a sectional view of the ceramic material with flame holes according to the embodiment.

Fig. 17 is a sectional view of the ceramic material according to the embodiment set in a fired mold.

18 is a cross-sectional view of a state in which a fired mold is placed on a ceramic material set in the fired mold according to the embodiment.

19 is a cross-sectional view of a state in which the ceramic material is bent and deformed in the fired mold and the fired mold according to the embodiment.

20 is a cross-sectional view of the bent and deformed ceramic plate according to the embodiment.

21 is a cross-sectional view of the ceramic material according to the embodiment bent and deformed only by the firing mold.

Fig. 22 is a cross-sectional view of a state in which a ceramic material is bent, bent and deformed into a fired mold and a fired mold according to an embodiment.

23 is a cross-sectional view of the bent and deformed ceramic material according to the embodiment.

24 is a cross-sectional view of the ceramic material cut after the bending deformation according to the embodiment.

25 is a cross-sectional view of the ceramic material having a tapered flame hole according to the embodiment.

26 is a cross-sectional view of a ceramic material that is bent and deformed after forming a tapered flame hole according to the embodiment.

Fig. 27 is a perspective view of a ceramic material having a flat circular flame hole according to an embodiment.

28 is a perspective view of a ceramic material that is bent and deformed after forming a flat circular flame hole according to the embodiment.

29 is a diagram illustrating the shape of the combined surface of the ceramic plate according to the embodiment.

** Description of the symbols for the main parts of the drawings **

10: burner 12: burner mounting plate

12a: through hole 14: burner body

16: distribution tube 16a: donation attachment

16b: end mounting piece 16c: screw hole

16d: distribution hole 18: end pressure plate

18a: Frangi 22: donation pressure plate

22a: flange 22b: opening

23,24: spot welding 26: ceramic plate

26a: flame hole 26b: dish hole

28 screw 30 heat exchanger

32: outer cylinder 32a: end plate

32b: exhaust port 32c: drain

32d: heating chamber 32e: condensing chamber

32f: partition 34: condensation pipe

36: heating pipe 37: the first header

38: second header 40: third header

42: combustion flame 50: rotating roller

52: ceramic material 54: cutter

56: ceramic material 58: lower mold

58a: Bottom 58b: Bottom ball

60: pressure plate 60a: pressure plate hole

62: Pictograph 64: Pin

64a: upper pin 64b: lower pin

64c: tapered portion 70: plastic lower mold

70a: forming surface 72: plastic bed

72a: forming surface

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic plate, a method for producing the same, and an all-type burner using the same.

Generally, a conventional pole-type burner is known, and a plurality of flame hole groups are formed in the burner box of the pole-type burner. The mixed gas of air and gas is blown out in the flame hole group of a burner, and a mixed gas is combusted in the electric pole of a burner. The pole-type burner has a uniform temperature distribution and is suitable for heating a heat exchanger such as a hot water heater.

Patent Literature 1 (Laboratory No. 42-22144) describes a cylindrical burner made of heat resistant steel sheet. Cylindrical burners made of heat-resistant steel sheet are easily formed by bending metal plates or extending radially to form a group of flame holes, but in this case, the heat resistance is weakened.

Patent Literature 2 (Patent Office No. 44-2634) discloses a technique of forming a burner box by combining ceramic plates. When the burner box is formed by combining ceramic plates, high heat resistance can be obtained. However, as described below, the conventional technique cannot radially extend to form flame holes.

Although a normal burner made of heat resistant steel sheet is called a heat resistant steel sheet, there is a problem in heat resistance. When burning a large amount of gas in the column-type burner, the temperature of the burner plate is rather low. If the thermal power is strong, because the heat of the mixer that is ejected from the flame hole of the burner plate is strong, the distance between the combustion flame and the burner plate is apart. If the thermal power is weak, the combustion flames will approach the burner plate and the burner plate temperature will be higher. When the combustion burner is weakened by a burner plate using a burner plate made of a heat resistant steel sheet, the burner plate itself and the flame hole are deformed as the heat resistant steel sheet as well as the heat resistant steel sheet deforms. It is not possible to weaken the thermal power sufficiently in the pole-type burner made of heat-resistant steel, and the thermal control range is narrow. For this reason, for example, when heating a heat exchanger, such as a warm water heater, and heating water to a target temperature, a burner chute and an undershoot become large according to a target temperature. For this reason, the exit temperature of the heat exchanger will deviate significantly from the target temperature.

The heat resistance temperature of the ceramic is higher than that of the heat resistant steel sheet. For this reason, in the case of ceramic pole burners, the thermal power can be sufficiently weakened, and the thermal power adjustment range is wide. Therefore, for example, when the water is heated to the target temperature by heating a heat exchanger such as a hot water heater, the overshoot and undershoot with respect to the target temperature can be reduced. It is possible to maintain the hot water temperature at the outlet of the heat exchanger in a small temperature range which is the target temperature.

Although it is not impossible to manufacture an ordinary burner made of a ceramic integrally, productivity is very bad. It is more productive to form a burner by combining a plurality of ceramic plates.

A plurality of flame holes are formed in the ceramic plates that form a normal burner in combination, but the axes (directions in which the holes extend) of the flame holes are arranged in parallel. In addition, in order to form a normal burner in combination, it is very difficult to form a group of flame holes extending radially with respect to the arcuately curved ceramic plate.

In order to manufacture a ceramic plate having a flame hole group, a flame hole group must be formed on a plate-shaped ceramic material before firing. At this time, if the axes of the flame ball group are arranged in parallel, the mold formed of the flame ball group can be extracted from the ceramic material before firing and the productivity is high. However, when the direction of extension of the group of flame holes (hole group) changes from place to place, for example, there is a difficulty in producing the ceramic plate in which the direction of extension of the flame hole group extends radially with good productivity. If a die is used to form a hole group in which the direction of extension to the current place is changed, the die forming the flame hole group cannot be extracted from the ceramic material before firing. On the other hand, if the shafts are arranged parallel to each other and the radially expanded flame ball group is prepared by bending the ceramic material before the formation of the extended flame ball group, gold is generated when bending the ceramic material before the firing.

In the case of manufacturing a pole burner by combining ceramic plates having a flame hole group, as described in Patent Literature 2, the flame hole group that extends in parallel (the flame hole group that does not change in the extending direction even when the forming position changes) The burner of the pole type was manufactured by dividing | segmenting into the plate which has this, and combining them.

That is, it is possible to manufacture the curved ceramic plate itself, and it is described in Patent Documents 3 and 4 (see Japanese Patent Application Laid-Open No. 56-28533 and Japanese Patent Application Laid-Open No. 58-10528) and the like. The formed flame hole group is extended in parallel, and the direction of extension of the hole does not change even if the position where the hole is formed changes (otherwise, it cannot be manufactured in the prior art).

Combustion flames of the burner-type burners formed by combining ceramic plates having a group of flame holes extending in parallel are not constant in the circumferential direction but are concentrated in a specific direction. For example, in a pole burner composed of four ceramic plates, combustion flames are concentrated in four directions, the ceramic plates have high heat resistance, and the distribution of the combustion flame in the circumferential direction is uneven. If the distribution of the circumferential direction of the combustion flame of the pole burner is uneven, there is a portion that is not heated in the heat exchanger disposed at the edge of the pole burner, and the heat exchange efficiency is deteriorated.

The present invention has been made to solve such a problem, when forming a column-type burner with a heat-resistant steel sheet, the temperature distribution in the main direction is uniform, but the thermal adjustment range is narrowed, and the ceramic plate burner with a ceramic plate Formation solves the problem of not being able to equalize the temperature distribution in the main direction, but it is possible to create a technology that can equalize the temperature distribution in the main direction while securing the wide range of thermal power control. It is possible to do

In the method for producing a ceramic plate according to claim 1, a ceramic plate is produced in which a direction in which the hole is extended varies depending on the formation position. The manufacturing method includes a step of forming a group of holes extending in the same direction in a plate-shaped ceramic material, and a step of baking the ceramic material while bending and deforming the ceramic material.

In the above method for producing a ceramic plate, a group of holes extending in parallel in the same direction with respect to the ceramic material before firing is formed. If the hole group extended in parallel in the same direction is formed, it can manufacture with high productivity. The ceramic material in which the hole group is formed is baked while being bent and deformed.

In the hole group of the ceramic plate thus manufactured, the elongation direction changes depending on the formation position. For example, the production of curved ceramic plates results in a group of holes extending radially. By manufacturing the electric pole burner using this ceramic plate, it is possible to secure a wide range of thermal power control and to equalize the temperature distribution in the circumferential direction.

That is, the hole mentioned here may be through-holes, such as a flame hole, and there may be a hole whose bottom surface is sealed. In addition, the bent and deformed ceramic plate may be variously curved or not, and may be planarized by grinding the curved surface, or may be planarized by bending and deforming the ceramic material before firing. It is important to change the direction in which the hole extends in accordance with the formation position, and according to this method, it is possible to produce a ceramic plate having a group of holes whose direction of extension changes in accordance with the formation position of the hole with good productivity.

It is preferable to carry out the primary baking of the ceramic material which formed the hole group in the state which maintained the shape, and to carry out the secondary baking, bending and deforming the primary baked ceramic plate (claim 2).

If the first calcined ceramic plate is bent and deformed while the second calcined ceramic plate is hardly cracked.

It is preferable to bend and deform during the secondary firing by mimicking the primary fired ceramic plate (die 3).

When the primary fired ceramic plate is bent and deformed by imitating a mold during secondary firing, the shape of the manufactured ceramic plate can be completed with good precision.

In order to imitate the mold, it is preferable to arrange the firstly fired ceramic plate between the lower die and the upper die, and to imitate the ceramic plate to the lower die by the upper die during the secondary firing (claim 4).

A primary fired ceramic plate is placed between the lower die and the upper die, and the ceramic plate is imitated on the lower die through the upper die during the secondary firing, whereby the shape of the largely curved ceramic plate can be completed with good precision.

The force imitating the lower mold is preferably based on the weight of the upper mold. In this case, the mold structure is simplified. The presence of the upper die may be omitted by controlling the temperature of the secondary firing so that it deforms into the magnetic weight of the ceramic plate itself.

The present invention is particularly effective when producing ceramic plates that are curved at a constant curvature (claim 5).

According to this manufacturing method, it is possible to manufacture a ceramic plate which is curved at a constant curvature and in which a radial hole group is formed.

The present invention can also produce a ceramic plate to which a plurality of flat plate portions are connected (claim 6).

According to this manufacturing method, a ceramic plate to which a plurality of flat plate portions are connected can be manufactured. In this case, although the holes of each flat plate part extend in parallel, when it observes through the some flat plate part, the hole group expands radially.

When bending the ceramic material, one surface of the ceramic material becomes the side to be stretched and the other surface becomes the side to be compressed. In this case, when the cross section forms a predetermined hole in the thickness direction and the ceramic plate is curved and deformed, the cross section of the hole is tensioned on the side where the tensioning side is stretched so that the cross section of the hole formed in the manufactured ceramic plate is not constant in the thickness direction.

Here, a tapered through hole is formed in which the cross section is reduced toward the surface on the side of the flat ceramic material which is stretched by bending deformation, and the ceramic plate is manufactured to have a through hole having a constant cross section in the thickness direction by firing the material. Preferred (claim 7).

According to the above production method, it is possible to produce a ceramic plate whose cross section of the through hole is constant in the thickness direction irrespective of the curvature deformation.

When curving and deforming a ceramic material, one surface of the ceramic material becomes a tensioned side and the other surface becomes a surface that is compressed. In this case, if the ceramic plate is curvedly deformed by forming a through hole opened in a circular shape on the surface of the ceramic material to be tensioned, the through hole formed in the surface of the tensioned side of the ceramic plate may be stretched to obtain a circular opening.

Here, it is preferable to form a ceramic plate having a through-hole opened in a circular shape by forming a through-hole opened in a flat circle on the surface of the side extending by the curved deformation of the flat ceramic material, and bending it (Claim 8) ).

According to the above production method, it is possible to manufacture a ceramic plate having a through hole opened in a circular shape regardless of curvature deformation.

According to the present invention, a ceramic plate in which the direction in which the through-hole is extended is changed in accordance with the formation position is obtained, and the burner can be formed by combining the ceramic plates (claim 9).

This burner has high heat resistance, the amount of combustion can be adjusted in a wide range from large thermal power to small thermal power, finely adjusts the hot water temperature and the like, and enables uniform combustion in the circumferential direction.

It is preferable that the ceramic plate used for the pole burner is formed with a group of through-holes which are curved at a constant curvature and extend radially (claim 10).

According to this ceramic plate, the combustion flame is radially expanded to prevent the combustion flame from being concentrated in a specific direction.

The ceramic plate curved at a constant curvature preferably has a center of curvature of 180 degrees or less (claim 11).

When the center of curvature of the ceramic plate is 180 degrees or less, the mold structure used for bending deformation becomes simple, and the ceramic plate after the bending deformation can be easily released.

A plurality of flat plate portions are connected to each other, and a columnar burner can be formed by a ceramic plate in which through-hole groups extending in a plane perpendicular to each flat plate portion are formed (claim 12).

One ceramic plate itself is bent, and by combining a small number of ceramic plates, it is possible to form a tubular burner having a polygonal cross section with many vertices. As the number of vertices of a normal burner increases, the uniformity of the circumferential direction of a combustion flame improves.

It is preferable that the through-hole is connected to the recessed part formed in the surface in the burner ceramic plate (claim 13).

In this case, combustion noise is minimized.

In the burner ceramic plate, when the cross sections of the ceramic plates are combined, it is preferable that the surface extending from the surface of one ceramic plate toward the other ceramic plate coincides with the surface of the other ceramic plate (claim 14).

According to such a ceramic plate, when combining ceramic plates, the surface is connected smoothly. In addition, the end faces of the ceramic plates can be brought into direct contact with each other, and there is no need to arrange a seal material or the like between them.

The present invention also provides a novel pole burner. This pole-shaped burner is provided with a plurality of ceramic plates combined, and each ceramic plate is formed with a group of through-holes in which the extending direction changes with respect to the forming position (claim 15).

This pole burner has high heat resistance, a wide range of adjustment of the amount of combustion, and no combustion flame is concentrated in a specific direction.

In the case of a burner-type burner in which a plurality of ceramic plates are combined, it is preferable that each ceramic plate is curved (claim 16). It may be bent without bending (claim 17). It is preferable that an ellipse, a flat circle, and a polygonal cylinder form a cylindrical or cross-section with a plurality of combined ceramic plates (claim 18).

Embodiments of the Invention The main features of the examples described below will be described.

(Form 1) The burner is a pole type. The cylindrical burner body is constructed by combining four curved ceramic plates.

(Form 2) The flame hole formed in the cylindrical burner main body is extended perpendicularly to the outer surface. That is, it extends radially.

(Form 3) A cross section in the axial direction of the ceramic plate is sandwiched by a base pressure plate and an end pressure plate fixed to a distribution tube, whereby a combined state of a plurality of ceramic plates is maintained to form a cylindrical burner body. do.

(Form 4) Corresponding to the manufacture of the ceramic plate, firstly, through-holes extending in the direction perpendicular to the plane are formed in the flat ceramic material. Therefore, the ceramic material is first fired while the flat plate state is maintained. Finally, the ceramic material set in the secondary firing type is secondarily fired to mimic the shape of the secondary firing type.

[Embodiment] An embodiment of the burner 10 of the present invention will be described with reference to the drawings. Burner 10 is a pole type.

As shown in FIG. 1, the burner 10 is composed of a burner mounting plate 12, a base pressure plate 22, a burner body 14, a distribution tube 16, an end pressure plate 18, and the like.

2 shows a state in which the burner body 14 and the end pressure plate 18 are peeled off from the burner 10 of FIG. The burner mounting plate 12 is disk-like and has four through-holes 12a, as shown well in FIG. The through hole 12a is for fixing the burner 10 to the heat exchanger 30 (the heat exchanger 30 will be described later). On the burner mounting plate 12, a base pressure plate 22 having a flange 22a formed on the outer circumference thereof is fixed by spot welding 23. As shown in FIG.

As shown in FIG. 2, a plurality of distribution holes 16d are formed in the distribution tube 16. The base of the distribution tube 16 is in communication with the outside by an opening 12b formed in the central portion of the burner mounting plate 12. That is, although the distribution hole 16d is arrange | positioned in fixed density in FIG. 2, the distribution of the combustion intensity of the burner main body 14 can be adjusted by adjusting the arrangement density. When the gas and air mixture is supplied into the distribution tube 16 through the opening of the burner mounting plate 12, the ejection from the distribution hole 16d is stronger at the end than the base of the distribution tube 16. It tends to be. This is because the pressure inside the distribution tube 16 is higher. Here, by distributing the distribution density of the distribution hole 16d low at the end and high at the base, the distribution of the mixer blown out from the distribution tube 16 can be made uniform. If the distribution of the mixer sprayed from the distribution pipe 16 can be made uniform, the distribution of the combustion intensity of the burner body 14 will also be made uniform.

As shown in FIG. 3, the shape viewed from the direction perpendicular to the axis of the distribution tube 16 is a square shape. Four base mounting pieces 16a facing outward are formed on the base (burner mounting plate 12 side) of the distribution pipe 16, and four end mountings facing inward on the end (end pressure plate 18 side). A piece 16b is formed. The base attachment piece 16a of the distribution tube 16 is arrange | positioned in the shape inserted into the square opening 22b formed in the base press plate 22. As shown in FIG. The distribution pipe 16 is mounted on the burner mounting plate 12 because the base mounting piece 16a is fixed to the burner mounting plate 12 by spot welding 24. One screw hole 16c is formed in each of the end mounting pieces 16b.

The burner body 14 is configured by combining four ceramic plates 26 made of ceramic shown in FIG. 4 as shown in FIG. A plurality of flame holes 26a shown in FIG. 1 are opened in the ceramic plate 26, but these flame holes 26a are omitted in FIGS. 4 and 5. The flame hole 26a is formed to extend at right angles to the outer surface of the ceramic plate 26. That is, although the flame hole 26a is opened with respect to the front surface of the ceramic plate 26, only a part of it is shown in FIG. How much to manufacture the ceramic plate 26 will be described in detail below.

1 and 6, the burner body 14 in which the ceramic plate 26 is combined is disposed between the base pressing plate 22 and the end pressing plate 18. As shown in FIG. The end pressing plate 18 is attached to the end mounting piece 16b of the distribution tube 16 by a screw 28. When the end pressure plate 18 is attached to the distribution tube 16, the end pressure plate 18 and the base pressure plate 22 press the burner body 14 in the axial direction. As such, the ceramic plates 26 of the burner body 14 remain combined.

The end press plate 18 and the base press plate 22 have a function of closing the end opening of the burner body 14. The distribution pipe 16 is for supplying a mixer in the burner body 14. The end pressing plate 18, the base pressing plate 22, and the distribution tube 16 also exist in a conventional pole burner. That is, the burner 10 of the present embodiment uses the conventional base plate 22, the end plate 18, and the distribution tube 16 to hold the combination of the ceramic plate 26. Therefore, there is no need to separately install a member for maintaining the assembled state of the ceramic plate 26. Therefore, the configuration is simple. Moreover, it is not necessary to arrange the member for maintaining the combined state of the ceramic plate 26 outside the outer periphery of the burner body 14, and it is not necessary to discuss the uniformity of the circumferential direction of a combustion flame.

The base pressing plate 22 and the end pressing plate 18 have flanges 22a and 18a, respectively. There is a gap between the inner diameters of the flanges 22a and 18a and the outer diameter of the burner body 14. Since the flanges 22a and 18a are provided, the operation can be easily performed when the ceramic plates 26 are combined and mounted.

That is, the holding of the ceramic plate 26 by the distribution pipe 16, the end pressure plate 18, and the base pressure plate 22 is not limited to being made possible by pressing the burner body 14 in the axial direction. For example, by combining the flange 18a of the end pressing plate 18 and the outer periphery of the end of the burner body 14 by the flange 22a of the base pressing plate 22, the combined state of the ceramic plate 26 is achieved. I can keep it.

7 schematically shows the heat exchanger 30. The heat exchanger 30 is an outer cylinder 32, a burner 10, a condensation pipe 34, a heating pipe 36, a first header 37, a second header 38, a third header 40 and the like. Consists of.

The outer cylinder 32 is cylindrical in shape, the disk-shaped end plate 32a is provided in one end, and the exhaust port 32b is opened in the other end. Moreover, the drain 32c is provided in the bottom part of the exhaust port 32b side of the outer cylinder 32. As shown in FIG. The half of the outer cylinder 32 at the end plate 32a side is the heating chamber 32d, and the half at the exhaust port 32b side is the condensation chamber 32e. The heating chamber 32d and the condensation chamber 32e are separated by a disk-shaped partition 32f formed on the inner surface of the outer cylinder 32.

The condensation pipe 34 is spirally connected with two, and is arrange | positioned in the condensation chamber 32e. One end of the condensation pipe 34 is in contact with the first header 37, and the other end is connected to the second header 38. The heating pipe 36 is also spirally connected with two, and the burner 10 is wound up and arrange | positioned in the heating chamber 32d. One end of the heating pipe 36 is connected to the second header 38 and the other end is connected to the third header 40.

The burner 10 is supplied with a mixture of gas and air, and is blown out of the flame hole 26a of the burner body 14. As shown in FIG. 8, the mixer ejected from the flame hole 26a is combusted to form the combustion flame 42. The combustion flame 42 is burned radially around the burner body 14. By installing the partition 32f, the combustion gas passes through the heating pipe 36 and flows into the condensation chamber 32e.

Cold water, such as tap water, is supplied to the first header 37. Cold water supplied to the first header 37 passes through the condensation pipe 34. In addition, the combustion gas generated when the mixer is burned in the burner 10 passes through the condensation chamber 32e and the exhaust port 32b and is discharged to the outside. Combustion gas contains water vapor. Therefore, the water vapor in the combustion gas passing through the condensation chamber 32e is recovered latent heat by the tap water passing through the condensation pipe 34 to become the condensed water 44. The condensed water 44 is discharged to the outside from the drain 32c. On the other hand, the tap water recovered latent heat from the water vapor flows into the second header 38 after the temperature rises.

The temperature of the tap water flowing into the second header 38 after passing through the two condensation pipes 34 is different in each of the condensation pipes 34. This temperature difference becomes uniform by mixing tap water in the second header 38. Tap water with a uniform temperature passes through the heating pipe 36. The tap water passing through the heating pipe 36 is heated by the combustion flame 42 burned by the burner 10 and becomes hot water of high temperature. The hot water is mixed in the third header 40 to be a uniform temperature and water is supplied to the outside of the heat exchanger 30. The hot water temperature is maintained at a predetermined temperature because the combustion intensity of the burner 10 is controlled by a controller (not shown). Hot water is used for heating and the like.

The ceramic plate 26 constituting the burner body 14 of this embodiment is a ceramic material. Therefore, the heat resistance of the burner body 14 is higher than when using a heat resistant steel material. And the distance ("d" of FIG. 8) of the combustion flame 42 and the burner body 14 can be narrowed rather than the burner body of a heat resistant steel material. Thus, weaker combustion is possible. 9 shows the effect.

9 is the TDR (Turn Down Ratio), and the vertical axis is the temperature of the burner. The lower limit of the TDR range of heat resistant steel burners is about 30% of the allowable temperature of the heat resistant steels. In contrast, in the case of a ceramic burner, the lower limit of the TDR range can be reduced to about 10%. If the burner 10 can perform weak combustion, as shown in FIG. 10, the error of the hot water temperature from the heat exchanger 30 can be reduced. This is because if the weaker combustion can be performed, the overshoot and undershoot on control become smaller when the combustion intensity is adjusted and the combustion is on / off.

In addition, as described above, the flame hole 26a of the ceramic plate 26 of the present embodiment is formed to extend at right angles to the outer surface of the ceramic plate 26. Therefore, the combustion flame 42 is burned radially. Therefore, the heating pipe 36 arrange | positioned in the shape which winds the burner main body 14 can be heated uniformly and efficiently.

The extent to which the ceramic plate 26 is manufactured is demonstrated.

First, as shown in FIG. 11, the clay ceramic material 52 (for example, cordierite) is blown in two rotary rollers 50 parallel to each other. The ceramic material 52 blown into the rotary roller 50 becomes flat. The flat ceramic material 52 is cut by the cutter 54 and becomes the rectangular ceramic material 56.

Next, as shown in FIG. 12, the ceramic material 56 is set in the lower mold 58. The cross section of the lower die 58 is concave, and a plurality of lower die holes 58b perpendicular to the bottom face 58a are formed. The axially perpendicular cross section of the lower die hole 58b is circular.

As shown in FIG. 13, the pressing plate 60 is set on the ceramic material 56. The pressure plate hole 60a is formed in the pressure plate 60. The pressure plate hole 60a is arranged so that its diameter is larger than that of the lower mold hole 58b of the lower mold 58 and its axis coincides with the lower mold hole 58b.

Therefore, as shown in FIG. 14, the upper mold 62 is set on the upper mold 58. The upper die 62 is provided with a plurality of pins 64 facing downward. The diameter of the lower pin 64b of the pin 64 has a size slightly smaller than the diameter of the lower mold hole 58b of the lower mold 58. The diameter of the pin-shaped portion 64a of the pin 64 is smaller than the diameter of the pressure plate hole 60a of the pressure plate 60. A tapered portion 64c is formed between the lower pin portion 64b and the pin-shaped portion 64a. The axis | shaft of the pin 64 is arrange | positioned so that it may coincide with the axis | shaft of the lower die | hole hole 58b and the presser plate hole 60a.

As shown in FIG. 15, the upper die 62 is lowered to form flame holes 26a penetrating the ceramic material 56 in the plane perpendicular direction by the pins 64. A fragment 56a of the ceramic material 56 extruded by the pins 64 falls downward. FIG. 16 shows a ceramic material 56 having flame holes 26a formed thereon. The dish hole portion 26b of the flame hole 26a is formed corresponding to the tapered portion 64c of the pin 64.

Next, primary firing is performed on the flat ceramic material 56 having the flame holes 26a formed thereon. Preferable temperature for primary firing is about 1000 ° C. The shape of the flat ceramic material 56 is not restrained between the primary firings.

Therefore, as shown in FIG. 17, the primary-fired ceramic material 56 is set in the lower firing mold 70 in a state where the plate hole portion 26b of the flame hole 26a is lowered. The shaping surface 70a of the fired mold 70 is formed in a concave shape of a quarter arc. Then, as shown in FIG. 18, the plastic mold 72 is placed on the ceramic material 56. As shown in FIG. The molding surface 72a of the plastic mold 72 is formed in an arc shape.

In this state, secondary firing is carried out. Preferable temperature for secondary baking is about 1320 degreeC. As shown in FIG. 19, when the secondary firing is performed, the softened ceramic material 56 is formed by mimicking the fired mold 70 and the fired mold 72 while being deformed by the weight of the fired mold 72. 20 shows a molded ceramic plate 26. Since the molding was performed in this way, the flame hole 26a of the ceramic plate 26 is extended radially. That is, the extending direction of the flame hole 26a extends radially. In other words, the dish hole 26b of the flame hole 26a adjusts the depth to change the lift of the combustion flame 42 (the distance between the combustion flame 42 and the outer surface of the ceramic plate 26). Have The shape of this part is not limited to a dish shape, but may be a simple concave shape.

As shown in FIG. 21, in the secondary firing, the bending may be conducted only by the lower firing die 70 without using the firing die 72. Secondary firing, even using only the firing die 70, causes the ceramic material 56 to mimic the molding surface 70a of the firing die 70 by its own weight.

Moreover, it can be curved-deformed without using the mold for baking. For example, both ends in the short axis direction of the ceramic material 56 are placed on the support member, and secondary firing is performed in that state. In this way, the ceramic material 56 is bent and deformed by its own weight.

As shown in Fig. 22, the ceramic material 56 may be formed into a bent shape to which the flat plate portion is connected.

As described above, when the ceramic plate 26 is molded, the flame hole 26a extends with respect to the plane perpendicular direction, regardless of the shape after the molding. Therefore, the direction of the combustion flame 42 discharged from the flame hole 26a is not concentrated in a specific direction.

As shown in Fig. 23, the ceramic material 56 may be bent and deformed during the secondary firing, and then the flat grinding may be performed after the secondary firing. 24 shows a ceramic material 56 that has been ground with a flat surface. By combining the bending deformation and the surface processing, the direction in which the flame hole 26a is extended with respect to the outer surface can be freely set.

It is also possible to form a group of flame holes elongated in parallel with the ceramic material before firing, and to bend and deform to planarize during secondary firing. Even in this way, as shown in Fig. 24, a ceramic plate having a radially expanded group of flame holes can be produced.

As shown in FIG. 25, the tapered flame hole 26a is formed in the ceramic material 56 before the bending deformation, and after that, the cross section (the right angled cross section) is constant in the thickness direction as shown in FIG. The ball 26a may be formed. Conversely, a flame hole 26a whose cross section is constant in the thickness direction is formed in the ceramic material 56 before the bending deformation, and the tapered flame hole 26a can be formed by bending deformation thereafter.

As shown in Fig. 27, a through hole 26a opened in a flat circle (ellipse) may be formed on the surface of the ceramic material 56 before bending deformation by the bending deformation. . In this way, by bending and deforming after that, as shown in FIG. 28, the ceramic plate which has a through-hole opened to a positive circular shape can be manufactured. If the opening of the flame hole 26a is circular, combustion efficiency can be improved and combustion noise can be reduced.

The cross-sectional shape used for the combination of the ceramic plates 26 may be composed of a plurality of surfaces rather than flat surfaces. For example, as shown in FIG. 29, the cross section 78 is comprised by three planes. This facilitates mutual positioning when combining the ceramic plates 26. In this embodiment, when the cross sections of the ceramic plates are combined, the surface of one ceramic plate extending toward the other ceramic plate coincides with the surface of the other ceramic plate. It is possible to form a continuous burner that is smoothly continuous as a whole.

As mentioned above, although the specific example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes variations and modifications of the specific examples exemplified above.

In addition, the technical element described in this specification or drawing can exhibit technical utility by single or various combinations, and is not limited to the combination of the claim description at the time of application. In addition, the technique shown in this specification or drawing achieves several objectives simultaneously, and has technical utility in itself by achieving one of these objectives.

Thus, for example, it may be configured as described below.

(1) The burner body is not normally limited. For example, hemispherical ceramics may be combined to form a hollow sphere burner body.

As described above, when the pole-type burner is formed of a heat-resistant steel sheet, the temperature distribution in the main direction becomes uniform, but the thermal control range is narrowed. When the pole-type burner is formed of ceramic plates, the thermal control range can be secured. It is possible to solve the problem of not being able to equalize the temperature distribution in the main direction, but at the same time, it is possible to equalize the temperature distribution in the main direction while ensuring a wide thermal control range.

Claims (18)

delete A method of manufacturing a ceramic plate in which a direction in which a hole grows is changed according to a formation position, the method comprising: forming a group of holes that grow in the same direction in a plate-shaped ceramic material; and firing while bending and deforming the ceramic material In the plate manufacturing method, The ceramic material forming the hole group is first baked while maintaining its shape, and the second baked while the primary baked ceramic plate bending and deformation. The method of claim 2, A method of manufacturing a ceramic plate, characterized in that the primary fired ceramic plate is bent and deformed during secondary firing by mimicking the shape of the primary fired ceramic plate. The method according to claim 3, wherein the first and second ceramic plates are disposed between the lower mold and the upper mold, and the ceramic plate is imitated on the lower mold through the upper mold during the second firing. The method according to any one of claims 2 to 4, Ceramic plate manufacturing method characterized in that the ceramic plate is bent to a certain curvature. The method according to any one of claims 2 to 4, Ceramic plate manufacturing method characterized in that for producing a ceramic plate connected to a plurality of flat plate. The method according to any one of claims 2 to 4, Forming a tapered through hole in which the cross section is reduced toward the side faced by curvature deformation of the flat ceramic material, and producing a ceramic plate having a through hole whose cross section is constant in the thickness direction. Ceramic plate manufacturing method. The method according to any one of claims 2 to 4, A ceramic plate manufacturing method, comprising: forming a through hole opened in a flat circle with respect to a side faced by bending deformation of a flat ceramic material, and having a through hole opened in a circular shape. delete delete delete In the ceramic plate in which the extending direction of the through hole is changed depending on the formation position, A plurality of plate portions are connected, and each plate portion is formed with a through-hole group extending in a direction perpendicular to the plane. The method of claim 12, Ceramic plate, characterized in that the through hole is connected to the recess formed on the surface. The method according to claim 12 or 13, A ceramic plate, characterized in that the surface of the ceramic plate coincides with the surface extending from one ceramic plate toward the other ceramic plate when the cross sections of the ceramic plates are combined. And a plurality of ceramic plates in combination, wherein each ceramic plate is formed with a group of through-holes in which the extending direction changes depending on the formation position. The burner of claim 15, wherein each ceramic plate is curved. The method of claim 16, Ceramic burner, characterized in that each ceramic plate is curved. The burner of any of claims 15 to 17, wherein the barrel is formed of a plurality of combined ceramic plates.

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