JP2011202929A - Gas burner unit and gas water heater using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas burner unit which prevents combustion gas from leaking outside, and a gas water heater using the same.SOLUTION: The gas burner unit 10 has a gas burner 12 including a flame hole 11 and an upper-part opening burner case 16 provided with a dual wall 15 including an inner wall plate 13 and an outer wall plate 14 arranged with a clearance between them on a side part of the burner case 16. An upper part of the outer wall plate 14 is connected with the base parts of flange plates 40, 42 with their edge parts projecting to the outside of the burner case. An upper part of the inner wall plate 13 is provided with support plate members 44, 45 with their base ends connected to the inner wall plate 13 and with their edges arranged outside the burner case 16. The support plate members 44, 45 are fixed to upper parts of the flange plates 40, 42 with screw members. Potions which are positioned on the base side from penetration places of the screw members bend downward to closely contact the flange plates 40, 42. In addition, a seal material 48 for covering the flange plates 40, 42 from the upper side is closely arranged on the upper surfaces of the support plate members 44, 45.

Description

The present invention relates to a gas burner unit including a burner case in which a gas burner is disposed, and a gas water heater using the gas burner unit.

A gas burner unit for supplying a heat source for heating water to a heat exchanger arranged at the top includes a burner case in which a plurality of gas burners for generating combustion gas as the heat source are arranged. For example, as described in Patent Document 1, the burner case is provided with a double plate structure on the side, and an air flow path is secured between the plates to reduce the amount of heat of the combustion gas transmitted to the outer plates. We are trying to make it.

Japanese Patent No. 4041983

However, in the gas burner unit (combustion part) described in Patent Document 1, a screw member for fixing the gas burner unit and the heat exchanger is inserted into a flange plate (upper end flange part) formed at the upper part of the burner case. There is a screw hole, and there is a possibility that the combustion gas flows out through the screw hole.
This invention is made | formed in view of this situation, and it aims at providing the gas burner unit which prevents the external leakage of combustion gas, and a gas water heater using the same.

The gas burner unit according to the first aspect of the present invention is provided with a gas burner having a flame opening, a double wall having an inner wall plate and an outer wall plate arranged with a gap at the side, and the inside A gas burner unit having an upper opening burner case provided with a gas burner, wherein a base portion of a collar plate having a tip portion projecting outside the burner case is connected to an upper portion of the outer wall plate, and is connected to an upper portion of the inner wall plate. Is provided with a support plate material having a base end portion connected to the inner wall plate and a distal end portion disposed outside the burner case, and the support plate material is inserted into a through hole formed in the collar plate. Thus, the portion fixed to the upper portion of the collar plate and located on the base side from the penetration portion of the screw member is bent downward and is in close contact with the collar plate, and on the upper surface of the support plate material The above Sealing material covering the plate from above are closely arranged.

In the gas burner unit according to the first aspect of the present invention, it is preferable that the support plate member includes a downward projecting body that is inserted into a positioning hole formed in the collar plate.

In the gas burner unit according to the first invention, the double wall has first to fourth side walls arranged in a rectangle or a square in plan view, and the first and third side walls facing each other. The provided inner wall plate is bent at the left and right sides of the inner wall plate in the outward direction of the burner case, and is formed at the front side of the bent portion by bending outward in the left-right direction. The inner wall plates on the first and third side walls are in contact with the outer wall plates on the first and third side walls, respectively, at the end plate portions, and are opposed to each other. It is preferable that the left and right ends of the inner wall plate respectively provided on the second and fourth side walls are in contact with the end plate portion.

In the gas burner unit according to the first aspect of the present invention, it is preferable that the end plate portion is provided at intervals above and below the left and right side portions of the inner wall plate provided on the first and third side walls. .

A gas water heater according to a second invention that meets the above-mentioned object is a gas water heater that uses the gas burner according to the first invention, and water is directly added by the gas burner unit and the combustion gas supplied from the gas burner unit. And a secondary heat exchanger that preheats water supplied to the primary heat exchanger by the combustion gas discharged from the primary heat exchanger.

In the gas burner unit according to the first invention and the gas water heater according to the second invention, the support plate material is fixed to the upper portion of the flange plate by a screw member inserted through a through hole formed in the flange plate, and the screw member Since the part located on the base side from the penetration part of the gas pipe is bent downward and is in close contact with the flange plate, the flow path of the combustion gas toward the through hole formed in the collar plate passes between the support member and the flange plate. Can be blocked.
Further, since the sealing material covering the collar plate from above is closely arranged on the upper surface of the supporting plate material, the upper part of the supporting member is also in a state where the flow path of the combustion gas is blocked, and from the through hole in the collar plate. It is possible to prevent external leakage of combustion gas.

Further, in the gas burner unit according to the first invention and the gas water heater according to the second invention, when the support plate material includes a downward projecting body inserted into a positioning hole formed in the collar plate, the inner wall plate and the outer wall plate The space | interval of each upper part is kept constant by the supporting member, and can suppress the thermal deformation of an inner wall board and an outer wall board.

Then, in the gas burner unit according to the first invention and the gas water heater according to the second invention, the inner wall plates on the first and third side walls are the end plate portions, respectively, on the first and third side walls. When contacting the outer wall plate, the contact area between the inner wall plate and the outer wall plate is reduced, and the amount of heat conduction from the inner wall portion to the outer wall portion can be suppressed to reduce the temperature rise of the outer wall portion. Further, when the left and right ends of the inner wall plates respectively provided on the second and fourth side walls are in contact with the end plate portion, the interval between the inner wall plates of the first and third side walls can be kept at a certain level or more. It is possible to suppress thermal deformation of the inner wall plates of the first and third side walls.

Furthermore, in the gas burner unit according to the first invention and the gas water heater according to the second invention, the end plate portion has a space above and below the left and right ends of the inner wall plate provided on the first and third side walls. The contact surface between the inner wall plate and the outer wall plate provided on the first and third side walls can be made smaller to reduce the amount of heat conduction from the inner wall plate to the outer wall plate, and to release heat from the burner case. It is possible to suppress the heat loss due to.

It is a perspective view of the gas burner unit concerning one embodiment of the present invention. It is a schematic diagram of the gas water heater using the gas burner unit. It is a top view of the gas burner unit. It is a fragmentary top view of the burner case which the gas burner unit has. It is the perspective view which expanded a part of the burner case. It is explanatory drawing of the shape of the side part of the 1st inner side board of the burner case.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 to 5, a gas burner unit 10 according to an embodiment of the present invention includes a gas burner 12 having a flame opening 11, and an inner wall plate 13 and an outer wall plate 14 arranged with a gap. The double wall 15 is provided on the side, and has a burner case 16 with an upper opening provided with a gas burner 12 inside, and is a gas combustion unit that generates combustion gas. Hereinafter, these will be described in detail.

As shown in FIG. 2, the gas burner unit 10 supplies combustion gas to a primary heat exchanger 19 disposed at the upper part of the gas burner unit 10. The primary heat exchanger 19 heats water directly by sensible heat of the combustion gas taken from the lower part to make hot water, sends the hot water to the mixing valve 20 and discharges the combustion gas from the upper part. The mixing valve 20 mixes hot water produced by the primary heat exchanger 19 with tap water flowing through the water pipe 21 to produce hot water at a predetermined temperature, and supplies the hot water to the hot water pipe 22.
A fan 23 that supplies air into the gas burner unit 10 is fixed to the bottom of the gas burner unit 10. The gas pipe 18 is a supply pipe that sends fuel gas to the gas burner unit 10.

A secondary heat exchanger 24 that preheats water supplied to the primary heat exchanger 19 by the combustion gas discharged from the primary heat exchanger 19 is disposed downstream of the primary heat exchanger 19. Therefore, the gas water heater 25 having the gas burner unit 10, the primary heat exchanger 19, the secondary heat exchanger 24, and the like uses the sensible heat and latent heat of the combustion gas in the primary heat exchanger 19 and the secondary heat exchanger 24, respectively. Water can be efficiently heated. The water preheated by the secondary heat exchanger 24 is supplied from the water pipe 21.
The primary heat exchanger 19 is connected to a circulation circuit 27 through which water is circulated by the operation of a circulation pump 26 provided in the gas water heater 25. The primary heat exchanger 19 supplies hot water used for hot water supply. While heating, the water flowing through the circulation circuit 27 is heated and supplied to a bathtub or the like. In addition, functional parts, members, and the like constituting the gas water heater 25 including the gas burner unit 10 are arranged and fixed in a box-shaped casing 28.

As shown in FIG. 1 and FIG. 3, an intermediate bottom plate 30 is provided at an upper portion of the bottom plate 29 with a fan 23 (see FIG. 2) attached to the lower portion with a space from the bottom plate 29. A large number of holes 30a for air sent from the fan 23 are formed.
The double wall 15 has first to fourth side walls 31 to 34 arranged in a rectangular shape in plan view, the first side wall 31 and the third side wall 33, and the second side wall 32 and the fourth side wall. The side walls 34 are arranged opposite to each other.
The first and third side walls 31 and 33 are arranged (standing) in the vertical direction, and the left and right end portions of the first and third side walls 31 and 33 are also arranged in the same vertical direction. Are in contact with one side (the side disposed in the front in FIG. 1) and the other side (the side disposed in the rear in FIG. 1). 1 and 3, the three gas burners 12 are depicted as being disposed at a distance in the burner case 16, but in reality, a plurality of, for example, 15 to 20 gas burners are depicted. Gas burners 12 are arranged in parallel in close proximity.

The first to fourth side walls 31 to 34 have a first inner plate 31a and a first outer plate 31b, a second inner plate 32a and a second outer plate 32b, a third inner plate 33a and a third plate, respectively. Outer plate 33b, and a fourth inner plate 34a and a fourth outer plate 34b. And the inner wall board 13 is comprised by the 1st-4th inner side board 31a-34a, and the outer wall board 14 is comprised by the 1st-4th outer side board 31b-34b. The first to fourth inner plates 31a to 34a are made of stainless steel heat-resistant and oxidation-resistant steel.
On the first side wall 31 (the same applies to the second to fourth side walls 32 to 34), the cooling air sent from the fan 23 rises between the first inner plate 31a and the first outer plate 31b. A gap is provided so that the temperature of the first outer plate 31b does not become too high. The cooling air that has passed through this gap flows into the primary heat exchanger 19 disposed at the upper part of the gas burner unit 10.
Further, as shown in FIG. 1, the first side wall 31 is provided with ignition / flame detection means (ignition and flame detection means) 38 having an electrode 37 for igniting the gas burner 12.

The first inner plate 31 a and the first outer plate 31 b cover the upper half of the side portion (front side portion) of the burner case 16. A lower vertical wall 36 having a plurality of openings 35 provided at equal intervals in the left-right direction is disposed at the lower portion of the first side wall 31, and the lower end portion of the lower vertical wall 36 is connected to the midsole plate 30. It is connected. A low-concentration mixture having a fuel concentration lower than the stoichiometric air-fuel ratio passes through the opening 35 and is supplied to the gas burner 12 disposed in the burner case 16. The lower vertical wall 36 has a plurality of openings (not shown) through which a high-concentration mixture having a higher fuel concentration than the stoichiometric air-fuel ratio supplied to the gas burner 12 passes above the opening 35. .
Further, the second to fourth outer plates 32b to 34b have lower ends connected to the bottom plate 29 so as to cover the entire surface of each side (left side, rear side and right side) of the burner case 16, respectively. In contrast to the arrangement, the second to fourth inner plates 32 a to 34 a have lower ends connected to the midsole plate 30.

As shown in FIG. 1 and FIG. 3 to FIG. 5, the top side of the first outer side plate 31b (the same applies to the third outer side plate 33b) is provided on the front side where the standing portion 39 is provided. The base portion of the flange plate 40 projecting over is connected. The collar plate 40 bends the upper part of the work plate (gold plate) of the first outer plate 31b arranged vertically at a right angle outward in the horizontal direction, and further bends the tip at a right angle toward the inner side (that is, upward). It is formed by forming a standing portion 39 that is vertically arranged by bending. This standing portion 39 is provided to maintain the strength of the collar plate 40. Instead of providing the standing portion 39, the strength of the collar plate can be maintained by bending the collar plate downward.
Similarly to the first outer plate 31b, the tip side with the vertically arranged portion 41 is projected outward in the horizontal direction also on the upper portion of the second outer plate 32b (the same applies to the fourth outer plate 34b). The base of the collar plate 42 is connected.
As shown in FIGS. 4 and 5, a plurality of (two in this embodiment) through-holes 43 are formed in the collar plates 40 and 42, and the bolt is an example of a screw member inserted through the through-holes 43. The lower frame portion of the primary heat exchanger 19 can be fixed to the collar plates 40 and 42 by nuts attached to the bolts.

At the upper part of the first inner plate 31a (the same applies to the third inner plate 33a), the tip end abuts from the inner side to the standing portion 39 of the collar plate 40 connected to the first outer plate 31b. A support plate 44 is provided. The support plate material 44 has a base end portion connected to the first inner plate 31a and is disposed horizontally (horizontal), and a distal end portion is disposed outside the burner case 16 (that is, the double wall 15). The interval between the first inner plate 31a and the first outer plate 31b is set so as not to be equal to or less than a certain value (in the range of 2 to 6 mm, for example, 4 mm).
Similarly to the first inner plate 31a, the upper end of the second inner plate 32a (the same applies to the fourth inner plate 34a) is also provided with a collar plate 42 whose tip is connected to the second outer plate 32b. A support plate member 45 that abuts on the installation portion 41 from the inside and connects the base end portion to the second inner plate 32a is provided.

The support plate material 44 (the same applies to the support plate material 45) has a front half that is wider than the base half that includes a portion connected to the first inner plate 31a, and is located at the center of the wide portion. Is provided with a through hole 46 through which a bolt inserted into a through hole 43 in the collar plate 40 is inserted. The support plate material 44 is fixed to the upper surface of the collar plate 40 by bolts inserted into the through holes 43 and 46, and a portion located on the base side from the through hole 46 bends downward and comes into close contact with the upper surface of the collar plate 40. It becomes a state.

This deflection is caused by the fact that the width of the base half of the support plate 44 is narrower than the front half and is easily bent in the vertical direction. Furthermore, by making the connection position (height) of the support plate material 44 with the first inner plate 31a higher than the position of the collar plate 40, the support plate material 44 can be bent downward. Further, due to the close contact between the support plate material 44 and the flange plate 40 due to the deflection, the combustion gas existing in the burner case 16 is prevented from passing through the through hole 46 and leaking to the outside of the gas burner unit 10. In the present embodiment, the base half of the support plate 44 has a width of 3 to 7 mm (for example, 5 mm) and a thickness of 0.5 to 1.2 mm (for example, 0.8 mm).
Further, since the heat-resistant sealing material 48 that covers the entire upper surface of the flange plates 40 and 42 from the upper side is closely arranged on the upper surface of the support plate material 44, the combustion gas is generated between the flange plates 40 and 42 and the support member 44. Leaking to the outside from each contact point of the primary heat exchanger 19 is prevented.
Further, since the base half of the support plate 44 is formed narrow, the amount of heat conduction from the first inner plate 31a to the first outer plate 31b can be reduced, and the gas burner unit 10 can be The heat loss of the combustion gas is reduced by suppressing heat dissipation from the case 16.

In the collar plate 40, a positioning hole 49 is formed in the vicinity of the place where the through hole 43 is formed, and the support plate material 44 has a downward projecting body 50 inserted into the positioning hole 49 as shown in FIGS. I have. The downward projecting body 50 is inserted into the positioning hole 49 and is hooked on the outer periphery of the positioning hole 49, and the interval between the flange plate 40 and the first inner plate 31a is constant (in the range of 2 to 6 mm, In the embodiment, the first inner plate 31a is drawn to the collar plate 40 so as not to exceed 4 mm).

As shown in FIGS. 4 and 6, the first inner side plate 31 a (the same applies to the third inner side plate 33 a) is bent at right and left sides at right angles to the outer side of the burner case 16. A plurality of (two in the present embodiment) end plate portions 51 formed by right-angle bending (ie, bending) outward in the left-right direction are provided on the front side of the bent portion. The end plate portion 51 is disposed on both the left and right sides of the first inner plate 31a with a space in the vertical direction, and projects the front side outward in the left-right direction. Since the first inner plate 31a is in contact with the first outer plate 31b at the end plate portion 51, the abutting surface is made smaller than when the first inner plate 31a is in contact with the first outer plate 31b over the entire side surface. In addition, the heat of the first inner plate 31a is not easily conducted to the first outer plate 31b.

Further, the second inner plate 32a (the same applies to the fourth inner plate 34a) has left and right ends (portions disposed at both front and rear ends in FIG. 1) of the first and third inner plates 31a and 33a. The end plate portion 51 provided on the side is in contact with the end plate portion 51 provided on the other side of the first and third inner plates 31a and 33a with respect to the fourth inner plate 34a. Therefore, the first and third inner plates 31a and 33a are kept at a distance so that the arrangement interval is not closer than the lateral width of the second and fourth inner plates 32a and 34a, and the amount of thermal deformation caused by the combustion gas is suppressed. Has been.
The first inner plate 31a (the same applies to the second to fourth inner plates 32a to 34a), as shown in FIGS. 1 and 5, has a plurality of protruding portions 52 protruding hemispherically outward. The first inner plate 31a is provided so that the protruding portion 52 is brought into point contact with the second outer plate 32b to reduce thermal deformation, and between the first inner plate 31a and the first outer plate 31b. A cooling air flow path is secured between them.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the first to fourth side walls may be arranged so as to be square in plan view.

10: Gas burner unit, 11: Flame outlet, 12: Gas burner, 13: Inner wall plate, 14: Outer wall plate, 15: Double wall, 16: Burner case, 18: Gas pipe, 19: Primary heat exchanger, 20: Mixing Valve: 21: Water pipe, 22: Hot water pipe, 23: Fan, 24: Secondary heat exchanger, 25: Gas water heater, 26: Circulation pump, 27: Circulation circuit, 28: Casing, 29: Bottom plate, 30: Middle bottom plate, 30a: through hole, 31: first side wall, 31a: first inner side plate, 31b: first outer side plate, 32: second side wall, 32a: second inner side plate, 32b: second The outer side plate, 33: third side wall, 33a: third inner side plate, 33b: third outer side plate, 34: fourth side wall, 34a: fourth inner side plate, 34b: fourth outer side plate, 35: Opening, 36: Lower vertical wall, 37: Electrode, 38: Ignition / flame detection means, 39: Standing up 40: collar plate, 41: standing portion, 42: collar plate, 43: through hole, 44, 45: support plate material, 46: through hole, 48: seal material, 49: positioning hole, 50: downward projecting body, 51: End plate part, 52: Protrusion part

Claims (5)

A gas burner unit having a gas burner with a flame opening, and a double wall with an inner wall plate and an outer wall plate arranged with a gap provided at the side, and an upper opening burner case with the gas burner inside. There,
A base portion of a flange plate with a tip portion projecting outside the burner case is connected to an upper portion of the outer wall plate, a base end portion is connected to the inner wall plate, and a distal end portion is connected to the upper portion of the inner wall plate. A support plate disposed outside the burner case is provided,
The support plate is fixed to the upper portion of the collar plate by a screw member inserted through a through hole formed in the collar plate, and a portion located on the base side from the penetration portion of the screw member is bent downward. A gas burner unit, wherein the seal plate is in close contact with the collar plate, and a sealing material that covers the collar plate from above is closely arranged on the upper surface of the support plate material. 2. The gas burner unit according to claim 1, wherein the support plate member includes a downward projecting body that is inserted into a positioning hole formed in the collar plate. 3. The gas burner unit according to claim 1, wherein the double wall has first to fourth side walls arranged in a rectangle or a square in a plan view, and the first and third side walls facing each other. Each of the inner wall plates provided is bent at the left and right sides thereof outwardly of the burner case, and is formed at the front side of the bent portion by bending outward in the left-right direction. A plate is provided,
The inner wall plates on the first and third side walls are in contact with the outer wall plates on the first and third side walls at the end plate portions, and are opposed to each other. The gas burner unit characterized in that the left and right ends of the inner wall plate respectively provided on the side wall are in contact with the end plate portion. 4. The gas burner unit according to claim 3, wherein the end plate portion is provided with a space above and below both left and right side portions of the inner wall plate provided on the first and third side walls. Gas burner unit to be used. A gas water heater using the gas burner unit according to any one of claims 1 to 4, wherein the gas burner unit and a primary heat exchanger that directly heats water using a combustion gas supplied from the gas burner unit. And a secondary heat exchanger for preheating water supplied to the primary heat exchanger by the combustion gas discharged from the primary heat exchanger.

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