EP1582810A2 - Cylindrical burner - Google Patents
Cylindrical burner Download PDFInfo
- Publication number
- EP1582810A2 EP1582810A2 EP05251921A EP05251921A EP1582810A2 EP 1582810 A2 EP1582810 A2 EP 1582810A2 EP 05251921 A EP05251921 A EP 05251921A EP 05251921 A EP05251921 A EP 05251921A EP 1582810 A2 EP1582810 A2 EP 1582810A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- plates
- sections
- heat chamber
- combustion plates
- combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/101—Flame diffusing means characterised by surface shape
- F23D2203/1012—Flame diffusing means characterised by surface shape tubular
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/102—Flame diffusing means using perforated plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2212/00—Burner material specifications
- F23D2212/10—Burner material specifications ceramic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2213/00—Burner manufacture specifications
Definitions
- the present invention relates to a cylindrical burner including a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape.
- the heat chamber is assembled by using a frame having plural window frames in a peripheral direction, fitting combustion plates in the respective window frames from the outside, screwing protection frames abutting against outer surfaces in peripheral parts of the respective combustion plates to the frame, and fixing the respective combustion plates to the frame (e.g., see Japanese Utility Model Publication No. 44-2634).
- a cylindrical burner including: a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape; a coupling member that extends in an axial direction inside the heat chamber; and a pair of holding plates fixed at both ends of the coupling member, wherein the respective holding plates are set in abutment against respective end faces of the heat chamber via end face packings overlapping the respective end faces to sandwich the heat chamber with both the holding plates from both sides in the axial direction.
- the frame with a complicated structure and the protection frames are made unnecessary, assembling is easy, and cost can be reduced.
- cylindrical flanges section bending inwardly in the axial direction are formed in outer peripheries of the respective holding plates and outer surfaces at ends of the heat chamber are covered by the flange sections such that it is possible to prevent the combustion plates from shifting to the outside in the radial direction.
- embodiments of the invention seek to make it possible to tighten the respective combustion plates inwardly in the radial direction and make it easier to assemble the holding plates in order to provide a cylindrical burner having improved assemblability in which gas does not leak from gaps among the combustion plates.
- a cylindrical burner includes a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape a coupling member that extends in an axial direction inside the heat chamber and a pair of holding plates fixed to both ends of the coupling member, the heat chamber being sandwiched from both sides in the axial direction by both the holding plates by setting the respective holding plates in abutment against end faces of the heat chamber via end face packings overlapping the respective end faces, wherein outer peripheral packing sections overlapping outer surfaces at the ends of the respective combustion plates are extended to outer peripheries of the respective end face packings and cylindrical flange sections bent inwardly in the axial direction are formed on outer peripheries of the respective holding plates such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the outer surfaces of the respective combustion plates thereof.
- an inner diameter of the flange sections can preferably be set larger than an outer diameter of the ends of the heat chamber by a thickness of the outer peripheral packing sections in a compressed state.
- the outer surfaces at the ends of the combustion plates are never scraped by the flange sections when the holding plates are assembled with the heat chamber.
- the outer peripheral packing sections are naturally sandwiched between inner surfaces of the flange sections and the outer surfaces at the ends of the combustion plates from base end sides thereof while being compressed.
- the flange sections are externally fit in the outer surfaces at the ends of the heat chamber smoothly while sandwiching the outer peripheral packing sections between the outer surfaces at the ends of the combustion plates and the flange sections when the flange sections are pressed inwardly in the axial direction. Therefore, it is easy to assemble the holding plates with the heat chamber.
- the heat chamber is constituted by combining the plural combustion plates in a cylindrical shape in a state in which side packings along side edges of the respective combustion plates are interposed among the respective combustion plates, even if the inner diameter of the flange sections are set larger than the outer diameter of the ends of the heat chamber in a free state, it is possible to compress the side packings by tightening the respective combustion plates strongly inwardly in the radial direction by a compression reaction of the outer peripheral packing section. Therefore, in this case, it is also possible to make it easy to assemble the holding plates and secure a sealing property by the side packings among the combustion plates.
- the end face packings and the side packings are formed by a ceramic packing molded by impregnating a binder in a ceramic fiber.
- the ceramic packing has a heat resistance
- the binder gradually decomposes thermally and disappears as time elapses and thickness of the ceramic packing decreases (becomes thin).
- a tightening force of the combustion plates decreases.
- the outer peripheral packing sections may separate from the end face packings and come off to fall from gaps between the flange sections of the holding plates and the outer surfaces at the ends of the combustion plates. It is likely that the outer peripheral packing sections, which have fallen from the gaps, touch flames to cause combustion failure.
- ring members which bind the plural combustion plates in a cylindrical shape, are mounted in parts adjacent to the outer peripheral packing sections on the outer surface of the heat chamber inwardly in the axial direction, and the gaps, which are formed between the outer surfaces at the ends of the respective combustion plates and the inner surfaces of the flange sections of the respective holding plates, are closed by the ring members.
- sunken sections sunken inwardly in the radial direction on the outer surfaces of the respective combustion plates thereof set an inner diameter of the flange sections of the respective holding plates such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the sunken sections, and mount the ring members to engage with the sunken sections. Consequently, steps at inner ends in the axial direction of the sunken sections work as stoppers to prevent the ring members from shifting. Therefore, post processing for preventing the ring members from shifting is made unnecessary, which is advantageous in realizing a reduction in cost.
- a cylindrical burner of the embodiment shown in FIG. 1 includes a heat chamber 1 of a cylindrical shape, a coupling member 2 (see FIGS. 2 and 3) that extends in an axial direction inside the heat chamber 1, a pair of holding plates 3 and 4 fixed to both ends of the coupling member 2 to sandwich the heat chamber 1 from both sides in the axial direction and an attaching plate 5 fixed to an outer surface of the holding plate 3 on one end side.
- the cylindrical burner is attached in a body of a machine such as a water heater or a heater at the attaching plate 5.
- the respective holding plates 3 and 4 are set in abutment against respective end faces of the heat chamber 1 via respective end face packings 6 overlapping the respective end faces.
- the heat chamber 1 is constituted by combining plural (e.g., six) strip- shaped combustion plates 7 made of ceramics, which have a plurality of burner ports 7a, in a cylindrical shape. Side packings 8 along side edges of the combustion plates 7 are provided among the respective combustion plates 7, 7. Note that the burner ports 7a are not formed in parts closer to ends of the combustion plates 7. However, dummy burner ports 7b of a blank hole shape are formed in the parts closer to the ends of the combustion plates 7 due to a reason relating to formation such as uniformalization of a shrinking percentage at the time of formation of the combustion plates 7.
- a gas inlet 5a is opened in a central part of the attaching plate 5.
- the attaching plate 5 is fixed to an outer surface of the holding plate 3 on one end side, which is formed in an annular shape, by spot welding or the like such that the gas inlet 5a faces an inner peripheral space of the holding plate 3.
- the coupling member 2 is formed in a square cylindrical shape.
- the coupling member 2 is fixed to an inner surface in a peripheral edge of the gas inlet 5a of the attaching plate 5 at one end by spot welding or the like. Therefore, the holding plate 3 on one end side is fixed to one end of the coupling member 2 via the attaching plate 5.
- a plurality of through holes 2a are formed in a peripheral surface of the coupling member 2.
- a mixed gas of a fuel gas flowing in from the gas inlet 5a and a primary air is supplied into the heat chamber 1 via these through holes 2a and blows out from burner ports 7a of the respective combustion plates 7 to burn.
- the coupling member 2 functions as a distributing pipe for distributing the mixed gas into the heat chamber 1 uniformly.
- a cap 2b is fastened to the other end of the coupling member 2.
- a projected portion 2c which is fit into an inner periphery of the holding plate 4 on the other end side formed in an annular shape, is formed in this cap 2b.
- the coupling member 2 is inserted into the heat chamber 1 and the holding plate 3 on one end side is set in abutment against one end face of the heat chamber 1 via the end face packing 6.
- the holding plate 4 on the other end side is set in abutment against the other end face of the heat chamber 1 via the end face packing 6.
- the projected portion 2c is inserted into the inner periphery of the holding plate 4.
- the projected portion 2c is crushed inwardly in the axial direction. Consequently, the holding plate 4 is caulked and fixed to the coupling member 2 in a state in which the holding plate 4 is pressed inwardly in the axial direction.
- the heat chamber 1 is sandwiched firmly between both the holding plates 3 and 4.
- Cylindrical flange sections 3a and 4a bending inwardly in the axial direction are formed in outer peripheries of the respective holding plates 3 and 4.
- Sunken sections 7c sunken inwardly in a radial direction are formed in outer surfaces at the ends of the respective combustion plates 7.
- plural outer peripheral packing sections 6a overlapping the sunken sections 7c of the respective combustion plates 7 are projected to outer peripheries of the end face packings 6 at an interval in a peripheral direction.
- ring members 9, which consist of a C-shaped elastic ring cut out at one place in a periphery are mounted on the outer surfaces at the ends on one end side and the other end side of the heat chamber 1 so as to engage with the sunken sections 7c of the combustion plates 7.
- the plural combustion plates 7 are bound by the ring members 9 in a cylindrical shape.
- the ring members 9 are formed of a spring material circular in section in this embodiment, the ring members 9 may be formed of a spring material square in section.
- the respective outer peripheral packing sections 6a are bent inwardly in the axial direction from base end sides by the flange sections 3a and 4a.
- the respective outer peripheral packing sections 6a are sandwiched between the sunken sections 7c of the respective combustion plates 7 and the inner surfaces of the flange sections 3a and 4a.
- an inner diameter of the flange sections 3a and 4a are set such that the outer peripheral packing sections 6a are sandwiched between the inner surfaces of the flange sections 3a and 4a and the sunken sections 7c while being compressed by a predetermined interference.
- combustion plates 7 are tightened inwardly in the radial direction by a compression reaction of the outer peripheral flange sections 6a.
- Side packings 8 among the respective combustion plates 7, 7 are compressed by this tightening force. Consequently, the side packings 8 are adapted to the combustion plates 7 and a sealing property among the respective combustion plates 7, 7 is secured.
- a length in the axial direction of the sunken sections 7c of the combustion plates 7 are set shorter than a length in the axial direction of the flange sections 3a and 4a. Even if the ring members 9 are pushed by the flange sections 3a and 4a to shift inwardly in the axial direction when the respective holding plates 3 and 4 are assembled, the ring members 9 are prevented to shift further by steps at inner ends in the axial direction of the sunken sections 7c of the combustion plates 7. Thus, the ring members 9 never slips out from the inner sides of the flange sections 3a and 4a. Therefore, the ring sections 9 are held surely in parts adjacent to the outer peripheral packing sections 6a of the outer surface of the heat chamber 1 inwardly in the axial direction. The gaps between the sunken sections 7c of the combustion plates 7 and the inner surfaces of the flange sections 3a and 4a are closed by the ring members 9.
- the end face packings 6 and the side packings 8 are formed by a ceramic packing molded by impregnating a binder in a ceramic fiber.
- the binder gradually decomposes thermally and disappears as time elapses and thickness of the ceramic packing decreases (becomes thin).
- the outer peripheral packing sections 6a become thin, a tightening force of the combustion plates 7 decreases.
- the combustion plates 7 are bound by the ring members 9 in a cylindrical shape, the combustion plates 7 are prevented from shifting to the outside in the radial direction to cause gas to leak from the gaps among the combustion plates 7, 7.
- the respective combustion plates 7 are pushed inwardly in the radial direction by an elastic force of the ring members 9, which are constituted by elastic rings, to reduce the gaps among the combustion plates 7, 7 by an amount equivalent to the reduced thickness of the side packings 8.
- a diameter of the heat chamber 1 is also reduced by the amount equivalent to the reduced thickness of the side packings 8. Therefore, even if the side packings 8 become thin, a sealing property among the combustion plates 7, 7 is secured and gas is prevented from leaking surely.
- the ring members 9 may be exposed partially from the inner sides of the flange sections 3a and 4a as long as gaps at the inner ends in the axial direction of the flange sections 3a and 4a, which are opening ends of the gaps between the sunken sections 7c of the combustion plates 7 and the inner surfaces of the flange sections 3a and 4a, are closed to a degree enough for preventing the outer peripheral packing sections 6a from coming off.
- the side packings 8 are provided among the respective combustion plates 7, 7.
- the ring members 9 only have to simply bind the plural combustion plats 7 in a cylindrical shape.
- FIG. 5 shows such an embodiment.
- the ring member 9 is formed by a band having a matching section 9a for spot welding in one place in a periphery. This band (rig member) 9 is mounted on the outer sides of the respective ends of the heat chamber 1 so as to engage with the sunken sections 7c of the respective ends of the combustion plates 7 as in the embodiment described above to bind the plural combustion plates 7.
- a cutout 4c of a slit shape corresponding to the matching section 9a of the band 9 is formed in the flange section 4a of the holding plate 4.
- the holding plate 4 is mounted at the end of the heat chamber 1 so as to sandwich the end face packing 6, the matching section 9a is inserted in the cutout 4c.
- the gaps between the sunken sections 7c of the combustion plates 7 and the inner surface of the flange section 4a are also closed by the band 9 to prevent the outer peripheral packing sections 6a from coming off to fall from the gaps.
- the holding plate 3 on one end side is not shown.
- a cutout corresponding to a matching section of a band mounted on an outer surface at an end on one end side of the heat chamber 1 is also formed in the flange section 3a of the holding plate 3.
- the matching section 9a of the band 9 may be fixed by spot welding before or after a step of mounting the band 9 on the outer surface at the end of the heat chamber 1.
- the band described above may be used as the ring member 9-
- the plural outer peripheral packing sections 6a corresponding to the plural combustion plates 7 are projected to the outer peripheries of the end face packings 6.
Abstract
Description
- The present invention relates to a cylindrical burner including a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape.
- Conventionally, in this type of the cylindrical burner, the heat chamber is assembled by using a frame having plural window frames in a peripheral direction, fitting combustion plates in the respective window frames from the outside, screwing protection frames abutting against outer surfaces in peripheral parts of the respective combustion plates to the frame, and fixing the respective combustion plates to the frame (e.g., see Japanese Utility Model Publication No. 44-2634).
- In this cylindrical burner, the frame of a complicated structure having the plural window frames and the protection frames for the respective combustion plates are required. Thus, there is an inconvenience in that the number of components increases, time and labor are required to assemble the cylindrical burner, and cost increases.
- Thus, in Japanese Patent Laid-Open Publication No. 2004-324910, the applicant proposed a cylindrical burner including: a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape; a coupling member that extends in an axial direction inside the heat chamber; and a pair of holding plates fixed at both ends of the coupling member, wherein the respective holding plates are set in abutment against respective end faces of the heat chamber via end face packings overlapping the respective end faces to sandwich the heat chamber with both the holding plates from both sides in the axial direction. According to this cylindrical burner, the frame with a complicated structure and the protection frames are made unnecessary, assembling is easy, and cost can be reduced.
- However, when the heat chamber is simply sandwiched from the axial direction, it is likely that the respective combustion plates shift to the outside in a radial direction, gaps are formed among the respective combustion plates, and gas leaks from the gaps. Thus, in the cylindrical burner of the prior application described above, cylindrical flanges section bending inwardly in the axial direction are formed in outer peripheries of the respective holding plates and outer surfaces at ends of the heat chamber are covered by the flange sections such that it is possible to prevent the combustion plates from shifting to the outside in the radial direction.
- Here, in order to hold the combustion plates without causing loosening in the radial direction, it is necessary to externally fit the flange sections of the holding plates firmly in the outer surfaces at the ends of the heat chamber. However, the outer surfaces at the ends of the combustion plates may be scraped by the flange sections when the holding plates are assembled with the heat chamber. This makes it difficult to assemble the holding plates. In particular, in order to improve a sealing property among the respective combustion plates, when plural combustion plates are combined in a cylindrical shape to form the heat chamber in a state in which side packings along side edges of the respective combustion plates are provided among the respective combustion plates, it is necessary to tighten the respective combustion plates inwardly in the radial direction such that the side packings are compressed by a predetermined interference. For this purpose, it is necessary to set an inner diameter of the flange sections smaller than an outer diameter of the heat chamber in a free state. This makes it extremely difficult to assemble the holding plates with the heat chamber.
- In view of the problems described above, embodiments of the invention seek to make it possible to tighten the respective combustion plates inwardly in the radial direction and make it easier to assemble the holding plates in order to provide a cylindrical burner having improved assemblability in which gas does not leak from gaps among the combustion plates.
- Preferably, a cylindrical burner includes a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape a coupling member that extends in an axial direction inside the heat chamber and a pair of holding plates fixed to both ends of the coupling member, the heat chamber being sandwiched from both sides in the axial direction by both the holding plates by setting the respective holding plates in abutment against end faces of the heat chamber via end face packings overlapping the respective end faces, wherein outer peripheral packing sections overlapping outer surfaces at the ends of the respective combustion plates are extended to outer peripheries of the respective end face packings and cylindrical flange sections bent inwardly in the axial direction are formed on outer peripheries of the respective holding plates such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the outer surfaces of the respective combustion plates thereof.
- According to the structure described above, an inner diameter of the flange sections can preferably be set larger than an outer diameter of the ends of the heat chamber by a thickness of the outer peripheral packing sections in a compressed state. Thus, the outer surfaces at the ends of the combustion plates are never scraped by the flange sections when the holding plates are assembled with the heat chamber. In addition, as the flange sections come closer inwardly in the axial direction from the end face sides of the heat chamber, the outer peripheral packing sections are naturally sandwiched between inner surfaces of the flange sections and the outer surfaces at the ends of the combustion plates from base end sides thereof while being compressed. In other words, the flange sections are externally fit in the outer surfaces at the ends of the heat chamber smoothly while sandwiching the outer peripheral packing sections between the outer surfaces at the ends of the combustion plates and the flange sections when the flange sections are pressed inwardly in the axial direction. Therefore, it is easy to assemble the holding plates with the heat chamber.
- In a state in which the holding plates are assembled with the ends of the heat chamber, the respective combustion plates are tightened inwardly in the radial direction by a compression reaction of the outer peripheral packing sections and the respective combustion plates are held firmly without loosening in the radial direction. Therefore, it is possible to surely prevent the inconvenience in that the combustion plates shift to the outside in the radial direction, gaps are formed among the combustion plates, and gas leaks from the gaps. In addition, when the heat chamber is constituted by combining the plural combustion plates in a cylindrical shape in a state in which side packings along side edges of the respective combustion plates are interposed among the respective combustion plates, even if the inner diameter of the flange sections are set larger than the outer diameter of the ends of the heat chamber in a free state, it is possible to compress the side packings by tightening the respective combustion plates strongly inwardly in the radial direction by a compression reaction of the outer peripheral packing section. Therefore, in this case, it is also possible to make it easy to assemble the holding plates and secure a sealing property by the side packings among the combustion plates.
- Incidentally, in general, the end face packings and the side packings are formed by a ceramic packing molded by impregnating a binder in a ceramic fiber. Although the ceramic packing has a heat resistance, the binder gradually decomposes thermally and disappears as time elapses and thickness of the ceramic packing decreases (becomes thin). When the outer peripheral packing sections become thin, a tightening force of the combustion plates decreases. As a result, it is likely that the combustion plates shift to the outside in the radial direction, gaps are formed among the combustion plates, and gas leaks. Moreover, when deterioration of the packings advances, the outer peripheral packing sections may separate from the end face packings and come off to fall from gaps between the flange sections of the holding plates and the outer surfaces at the ends of the combustion plates. It is likely that the outer peripheral packing sections, which have fallen from the gaps, touch flames to cause combustion failure.
- Therefore, it is desirable that ring members, which bind the plural combustion plates in a cylindrical shape, are mounted in parts adjacent to the outer peripheral packing sections on the outer surface of the heat chamber inwardly in the axial direction, and the gaps, which are formed between the outer surfaces at the ends of the respective combustion plates and the inner surfaces of the flange sections of the respective holding plates, are closed by the ring members.
- Consequently, even if the external packing sections become thin and the tightening force of the combustion plates decreases, since the plural combustion plates constituting the heat chamber are bound in a cylindrical shape by the ring members, the combustion plates never shift to the outside in the axial direction to form gaps among the combustion plates and gas is prevented from leaking from gaps between the combustion plates. In addition, even if the outer peripheral packing sections separate from the end face packings, the outer peripheral packing sections are prevented from coming off to fall from the gaps between the outer surfaces at the ends of the combustion plates and the inner surfaces of the flange sections of the holding plates by the ring members closing the gaps. Therefore, the outer peripheral packing sections are also prevented from touching flames to cause combustion failure. In this way, since the inconvenience due to deterioration of the packings is eliminated, limitation on a life of the packings due to deterioration is eased and durability of the packings is improved.
- Here, in order to prevent the outer peripheral packing sections from coming off to fall, it is necessary to prevent the ring members from shifting inwardly in the axial direction from the position for closing the gaps between the outer surfaces at the ends of the combustion plates and the inner surfaces of the flange sections of the holding plates. In this case, it is conceivable to push the ring members into the inner sides of the flange sections of the holding plates and, then, caulk edges of the flange sections inwardly in the radial direction partially, and prevent shift of the ring members with the caulked portions. However, time and labor are required.
- Thus, it is desirable to form sunken sections sunken inwardly in the radial direction on the outer surfaces of the respective combustion plates thereof, set an inner diameter of the flange sections of the respective holding plates such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the sunken sections, and mount the ring members to engage with the sunken sections. Consequently, steps at inner ends in the axial direction of the sunken sections work as stoppers to prevent the ring members from shifting. Therefore, post processing for preventing the ring members from shifting is made unnecessary, which is advantageous in realizing a reduction in cost.
- Incidentally, when the side packings are provided among the respective combustion plates, first, it is necessary to tighten the respective combustion plates strongly inwardly in the radial direction to compress the side packings to adapt the side packings to the combustion plates. Here, if such a strong tightening force is obtained only with the ring members, the combustion plates do not have to be tightened by the flange sections of the holding plates via the outer peripheral packing sections. However, when the combustion plates are tightened by the ring members, since an area of contact of the ring members with the combustion plates is small, a local stress is applied to the combustion plates. Therefore, it is difficult to obtain a strong tightening force only with the ring members because of strength of the combustion plates. On the other hand, when the combustion plates are tightened by the flange sections of the holding plates via the outer peripheral packing sections, it is possible to secure a large area of contact of the outer peripheral packing sections with the combustion plates. Thus, it is possible to naturally tighten the combustion plates strongly. Once the side packings are adapted to the combustion plates by the compression of the side packings due to the tightening, even if the tightening force decreases because of deterioration of the outer peripheral packing sections, the sealing property among the respective combustion plates is secured as long as the combustion plates are bound in a cylindrical shape by the ring members.
- However, when the side packings become thin and gaps are formed between the side packings and the combustion plates, gas leaks- In this case, if the ring members are formed by elastic rings that elastically tighten the plural combustion plates inwardly in the radial direction, the combustion plates are pushed inwardly in the radial direction by an elastic force of the elastic rings as the side packings becomes thinner, and a diameter of the heat chamber is reduced. Therefore, gaps are never formed between the side packings and the combustion plates and gas is prevented from leaking.
- For a better understanding of the present invention and to show how it may be carried into effect, reference shall now be made, by way of example, to the accompanying drawings, in which:
- FIG. 1 is a plan view of a cylindrical burner according to a first embodiment of the invention;
- FIG. 2 is a sectional view cut along line II-II in Fig. 1;
- FIG. 3(a) is a sectional view cut along line III-III in FIG. 2;
- FIG. 3 (b) is an enlarged sectional view of a part encircled by an alternate long and short dash line b in FIG. 3(a);
- FIG. 4 is a perspective view of a heat chamber of the burner in FIG. 1: and
- FIG. 5 is a perspective view of a disassembled state of a main part of a cylindrical burner according to a second embodiment of the invention.
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- A cylindrical burner of the embodiment shown in FIG. 1 includes a heat chamber 1 of a cylindrical shape, a coupling member 2 (see FIGS. 2 and 3) that extends in an axial direction inside the heat chamber 1, a pair of
holding plates 3 and 4 fixed to both ends of thecoupling member 2 to sandwich the heat chamber 1 from both sides in the axial direction and an attaching plate 5 fixed to an outer surface of theholding plate 3 on one end side. The cylindrical burner is attached in a body of a machine such as a water heater or a heater at the attaching plate 5. As shown in FIG. 3 (a), therespective holding plates 3 and 4 are set in abutment against respective end faces of the heat chamber 1 via respective end face packings 6 overlapping the respective end faces. - The heat chamber 1 is constituted by combining plural (e.g., six) strip-
shaped combustion plates 7 made of ceramics, which have a plurality ofburner ports 7a, in a cylindrical shape.Side packings 8 along side edges of thecombustion plates 7 are provided among therespective combustion plates burner ports 7a are not formed in parts closer to ends of thecombustion plates 7. However,dummy burner ports 7b of a blank hole shape are formed in the parts closer to the ends of thecombustion plates 7 due to a reason relating to formation such as uniformalization of a shrinking percentage at the time of formation of thecombustion plates 7. - Referring to FIG. 3(a), a gas inlet 5a is opened in a central part of the attaching plate 5. The attaching plate 5 is fixed to an outer surface of the holding
plate 3 on one end side, which is formed in an annular shape, by spot welding or the like such that the gas inlet 5a faces an inner peripheral space of the holdingplate 3. Thecoupling member 2 is formed in a square cylindrical shape. Thecoupling member 2 is fixed to an inner surface in a peripheral edge of the gas inlet 5a of the attaching plate 5 at one end by spot welding or the like. Therefore, the holdingplate 3 on one end side is fixed to one end of thecoupling member 2 via the attaching plate 5. A plurality of through holes 2a are formed in a peripheral surface of thecoupling member 2. A mixed gas of a fuel gas flowing in from the gas inlet 5a and a primary air is supplied into the heat chamber 1 via these through holes 2a and blows out fromburner ports 7a of therespective combustion plates 7 to burn. Here, thecoupling member 2 functions as a distributing pipe for distributing the mixed gas into the heat chamber 1 uniformly. - A
cap 2b is fastened to the other end of thecoupling member 2. A projected portion 2c, which is fit into an inner periphery of the holding plate 4 on the other end side formed in an annular shape, is formed in thiscap 2b. In assembling the burner, first, thecoupling member 2 is inserted into the heat chamber 1 and the holdingplate 3 on one end side is set in abutment against one end face of the heat chamber 1 via the end face packing 6. Next, the holding plate 4 on the other end side is set in abutment against the other end face of the heat chamber 1 via the end face packing 6. In this case, the projected portion 2c is inserted into the inner periphery of the holding plate 4. Finally, the projected portion 2c is crushed inwardly in the axial direction. Consequently, the holding plate 4 is caulked and fixed to thecoupling member 2 in a state in which the holding plate 4 is pressed inwardly in the axial direction. Thus, the heat chamber 1 is sandwiched firmly between both the holdingplates 3 and 4. -
Cylindrical flange sections respective holding plates 3 and 4. Sunken sections 7c sunken inwardly in a radial direction are formed in outer surfaces at the ends of therespective combustion plates 7. As shown in FIG. 4, plural outer peripheral packing sections 6a overlapping the sunken sections 7c of therespective combustion plates 7 are projected to outer peripheries of the end face packings 6 at an interval in a peripheral direction. Moreover,ring members 9, which consist of a C-shaped elastic ring cut out at one place in a periphery , are mounted on the outer surfaces at the ends on one end side and the other end side of the heat chamber 1 so as to engage with the sunken sections 7c of thecombustion plates 7. Theplural combustion plates 7 are bound by thering members 9 in a cylindrical shape. Note that, although thering members 9 are formed of a spring material circular in section in this embodiment, thering members 9 may be formed of a spring material square in section. - When the
respective holding plates 3 and 4 are set in abutment against the respective end faces of the heat chamber 1 via the respective end face packings 6, the respective outer peripheral packing sections 6a are bent inwardly in the axial direction from base end sides by theflange sections respective combustion plates 7 and the inner surfaces of theflange sections flange sections flange sections combustion plates 7 are tightened inwardly in the radial direction by a compression reaction of the outer peripheral flange sections 6a.Side packings 8 among therespective combustion plates combustion plates 7 and a sealing property among therespective combustion plates - Incidentally, in order to tighten the
combustion plates 7 inwardly in the radial direction with theflange sections flange sections combustion plates 7 may be scraped by theflange sections plates 3 and 4 are assembled with the heat chamber 1. This makes it very difficult to assemble the holdingplates 3 and 4. On the other hand, in this embodiment, it is possible to set the inner diameter of theflange sections combustion plates 7 are never scraped by theflange sections plates 3 and 4 are assembled with the heat chamber 1. This makes it easy to assemble the holdingplates 3 and 4 with the heat chamber 1. Moreover, in this embodiment,taper sections flange sections flange sections plates 3 and 4 are assembled. This makes it easier to assemble the holdingplates 3 and 4 with the heat chamber 1. - A length in the axial direction of the sunken sections 7c of the
combustion plates 7 are set shorter than a length in the axial direction of theflange sections ring members 9 are pushed by theflange sections respective holding plates 3 and 4 are assembled, thering members 9 are prevented to shift further by steps at inner ends in the axial direction of the sunken sections 7c of thecombustion plates 7. Thus, thering members 9 never slips out from the inner sides of theflange sections ring sections 9 are held surely in parts adjacent to the outer peripheral packing sections 6a of the outer surface of the heat chamber 1 inwardly in the axial direction. The gaps between the sunken sections 7c of thecombustion plates 7 and the inner surfaces of theflange sections ring members 9. - Here, the end face packings 6 and the side packings 8 are formed by a ceramic packing molded by impregnating a binder in a ceramic fiber. Thus, the binder gradually decomposes thermally and disappears as time elapses and thickness of the ceramic packing decreases (becomes thin). When the outer peripheral packing sections 6a become thin, a tightening force of the
combustion plates 7 decreases. However, since thecombustion plates 7 are bound by thering members 9 in a cylindrical shape, thecombustion plates 7 are prevented from shifting to the outside in the radial direction to cause gas to leak from the gaps among thecombustion plates respective combustion plates 7 are pushed inwardly in the radial direction by an elastic force of thering members 9, which are constituted by elastic rings, to reduce the gaps among thecombustion plates side packings 8. In addition, a diameter of the heat chamber 1 is also reduced by the amount equivalent to the reduced thickness of theside packings 8. Therefore, even if the side packings 8 become thin, a sealing property among thecombustion plates - In addition, even if deterioration of the outer peripheral packing sections 6a advances and the outer peripheral packing sections 6a separate from the end face packings 6, since the gaps between the sunken sections 7c of the
combustion plates 7 and the inner surfaces of theflange sections ring members 9, the outer peripheral packing sections 6a never come off to fall from the gaps. Therefore, the outer peripheral packing sections 6a are surely prevented from coming off to fall and touching flames to cause combustion failure. Note that the gaps between the sunken sections 7c of thecombustion plates 7 and the inner surfaces of theflange sections ring members 9 are closed sufficiently if the outer peripheral packing sections 6a are prevented from coming off. The gaps do not have to be closed completely. Thering members 9 may be exposed partially from the inner sides of theflange sections flange sections combustion plates 7 and the inner surfaces of theflange sections ringmembers 9 by heat, as in this embodiment, it is desirable to hold thering members 9 on the inner sides of theflange sections - In the explanation of the embodiment, the side packings 8 are provided among the
respective combustion plates combustion plates 7 in direct contact with the side ends of theadjacent combustion plates 7 to remove theside packings 8. In this case, it is unnecessary to reduce a diameter of the heat chamber 1 according to a reduction in thickness of theside packings 8. Therefore, thering members 9 only have to simply bind theplural combustion plats 7 in a cylindrical shape. FIG. 5 shows such an embodiment. In this embodiment, thering member 9 is formed by a band having a matching section 9a for spot welding in one place in a periphery. This band (rig member) 9 is mounted on the outer sides of the respective ends of the heat chamber 1 so as to engage with the sunken sections 7c of the respective ends of thecombustion plates 7 as in the embodiment described above to bind theplural combustion plates 7. - A cutout 4c of a slit shape corresponding to the matching section 9a of the
band 9 is formed in theflange section 4a of the holding plate 4. When the holding plate 4 is mounted at the end of the heat chamber 1 so as to sandwich the end face packing 6, the matching section 9a is inserted in the cutout 4c. In this embodiment, the gaps between the sunken sections 7c of thecombustion plates 7 and the inner surface of theflange section 4a are also closed by theband 9 to prevent the outer peripheral packing sections 6a from coming off to fall from the gaps. Here, in FIG. 5, the holdingplate 3 on one end side is not shown. However, a cutout corresponding to a matching section of a band mounted on an outer surface at an end on one end side of the heat chamber 1 is also formed in theflange section 3a of the holdingplate 3. Note that the matching section 9a of theband 9 may be fixed by spot welding before or after a step of mounting theband 9 on the outer surface at the end of the heat chamber 1. - In addition, in the burner in which the side packings 8 are provided among the
respective combustion plates plural combustion plates 7 are projected to the outer peripheries of the end face packings 6. However, it is also possible to project cylindrical outer peripheral packing sections, which bend in the axial direction, to the outer peripheries of the end face packings 6.
Claims (4)
- A cylindrical burner comprising:a heat chamber constituted by combining plural strip-shaped combustion plates, which have a plurality of burner ports, in a cylindrical shape;a coupling member that extends in an axial direction inside the heat chamber: anda pair of holding plates fixed to both ends of the coupling member,
outer peripheral packing sections overlapping outer surfaces at the ends of the respective combustion plates are extended to outer peripheries of the respective end face packings and cylindrical flange sections bent inwardly in the axial direction are formed on outer peripheries of the respective holding plates such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the outer surfaces of the respective combustion plates thereof. - The cylindrical burner according to claim 1.
characterized in that ring members, which bind the plural combustion plates in a cylindrical shape, are mounted in parts adjacent to the outer peripheral packing sections on the outer surface of the heat chamber inwardly in the axial direction, and the gaps, which are formed between the outer surfaces at the ends of the respective combustion plates and the inner surfaces of the flange sections of the respective holding plates, are closed by the ring members. - The cylindrical burner according to claim 2,
characterized in that sunken sections sunken inwardly in the radial direction are formed on the outer surfaces of the respective combustion plates thereof, an inner diameter of the flange sections of the respective holding plates is set such that the outer peripheral packing sections are compressed by a predetermined interference and sandwiched between the inner surfaces of the flange sections and the Sunkens and the ring members are mounted to engage with the sunken sections. - The cylindrical burner according to claim 2 or 3,
characterized in that, the heat chamber is constituted by combining the plural combustion plates in a cylindrical shape in a state in which side packings along side edges of the respective combustion plates are provided among the combustion plates, the ring members are constituted by elastic rings that elastically tighten the plural combustion plates inwardly in the radial direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004096337 | 2004-03-29 | ||
JP2004096337A JP3996139B2 (en) | 2004-03-29 | 2004-03-29 | Cylindrical burner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1582810A2 true EP1582810A2 (en) | 2005-10-05 |
EP1582810A3 EP1582810A3 (en) | 2011-12-07 |
EP1582810B1 EP1582810B1 (en) | 2013-07-24 |
Family
ID=34879924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050251921 Expired - Fee Related EP1582810B1 (en) | 2004-03-29 | 2005-03-29 | Cylindrical burner |
Country Status (2)
Country | Link |
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EP (1) | EP1582810B1 (en) |
JP (1) | JP3996139B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1840461A1 (en) * | 2006-03-29 | 2007-10-03 | Aeromatix Limited | End cap for a gas burner |
GB2617886A (en) * | 2022-04-21 | 2023-10-25 | Francis Kennedy John | Heating apparatus, burner device and method of construction |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120301836A1 (en) * | 2011-05-27 | 2012-11-29 | Kazuyuki Akagi | Plate type burner |
JP7442804B2 (en) | 2020-05-26 | 2024-03-05 | 株式会社トヨトミ | Radiant combustion device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62125208A (en) * | 1985-11-26 | 1987-06-06 | Matsushita Electric Ind Co Ltd | Combustion device |
FR2700604B1 (en) * | 1993-01-15 | 1995-04-07 | Joseph Le Mer | Method of manufacturing a gas burner element, element thus obtained, and burner using it. |
DE4418964A1 (en) * | 1994-05-31 | 1995-12-07 | Johannes Wilhelmus Graat | Hollow cylindrical burner head and process for its manufacture |
DE19627103C1 (en) * | 1996-07-05 | 1997-07-24 | Schwank Gmbh | Tubular ceramic radiation burner for infra-red radiation |
DE19813897A1 (en) * | 1998-03-28 | 1999-09-30 | Bosch Gmbh Robert | Segmented insulation for burners with porous media |
-
2004
- 2004-03-29 JP JP2004096337A patent/JP3996139B2/en not_active Expired - Fee Related
-
2005
- 2005-03-29 EP EP20050251921 patent/EP1582810B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
None |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1840461A1 (en) * | 2006-03-29 | 2007-10-03 | Aeromatix Limited | End cap for a gas burner |
GB2617886A (en) * | 2022-04-21 | 2023-10-25 | Francis Kennedy John | Heating apparatus, burner device and method of construction |
Also Published As
Publication number | Publication date |
---|---|
EP1582810B1 (en) | 2013-07-24 |
JP3996139B2 (en) | 2007-10-24 |
JP2005282922A (en) | 2005-10-13 |
EP1582810A3 (en) | 2011-12-07 |
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