JP6727648B2 - Water heater - Google Patents

Description

The present invention relates to a sensible heat recovery type water heater.

BACKGROUND ART Heretofore, a water heater has been widely put into practical use in which the combustion exhaust gas of a burner is passed through a heat exchanger to exchange the combustion heat of the combustion exhaust gas with the water flow of the heat exchanger.
The water heater includes a main heat exchanger that mainly recovers sensible heat and a sub heat exchanger that recovers latent heat, and a latent heat recovery type water heater (see, for example, Patent Document 1) It is roughly classified into a sensible heat recovery type hot water heater having only an exchanger (see, for example, Patent Document 2).
In the latent heat recovery type water heater, the main heat exchanger is installed above the combustion chamber where the burner is installed, and the sub heat exchanger is installed above it, but the main heat exchanger and the sub heat exchanger are not fixed. A flange portion provided on the upper opening peripheral edge of the casing of the main heat exchanger, and a flange provided on the lower end opening peripheral portion of the introducing member for introducing the combustion exhaust gas passing through the main heat exchanger, the flange portion provided on the lower portion of the auxiliary heat exchanger It is performed by butting and caulking the parts with the packing interposed.
The sub heat exchanger is usually formed larger than the main heat exchanger and protrudes forward, and a cylindrical outlet member provided in the front portion is inserted into a hole portion of the front cover that closes the housing. The combustion exhaust gas after the latent heat recovery is discharged to the outside of the equipment.

On the other hand, in a sensible heat recovery type water heater, an exhaust hood having an exhaust passage for combustion exhaust is installed above the main heat exchanger. When the housing is also used as a latent heat recovery type water heater, this exhaust hood is formed to be larger than the main heat exchanger like the sub heat exchanger and projects forward, and has a cylindrical outlet provided at the front. By inserting the member into the hole of the front cover, the combustion exhaust gas after sensible heat recovery is discharged from the exhaust passage to the outside of the device through the outlet member.

JP, 2015-14443, A Japanese Patent No. 5872963

However, since the exhaust hood does not have an introducing member such as a sub heat exchanger inside, it is necessary to form an opening in the bottom plate that is caulked and fixed to the exhaust hood to fit the flange part of the main heat exchanger. become. In this case, the rear edge of the opening edge and the left and right side edges are close in size to the flange portion of the main heat exchanger, so just outside the flange portion is the caulking position of the bottom plate, but on the front side, When the exhaust hood projects forward, the caulking position of the front end of the exhaust hood may be separated from the front edge of the flange portion, and the sealability may not be sufficiently maintained.

Therefore, an object of the present invention is to provide a water heater capable of caulking and fixing a sensible heat recovery type heat exchanger and an exhaust hood while maintaining a good sealing property.

In order to achieve the above object, the invention according to claim 1 is a heat exchanger in which a first flange portion is provided in an upper end opening of a casing, and the heat exchanger is fixed to an upper side of the heat exchanger, and a front portion of the heat exchanger is higher than that of the heat exchanger. Is a water heater that includes an exhaust hood protruding forward and having an exhaust pipe protruding from the front end,
The exhaust hood has a front portion that projects forward from the heat exchanger and opens, and the left and right and rear portions are closed and disposed on the left and right and rear portions of the casing. The left and right end edges and the rear end edge have the first flange portion. And an exhaust casing around which a second flange portion is provided, which has a plurality of caulking pieces for caulking, and a front caulking member that is installed in the left-right direction on the lower surface of the exhaust casing and projects downward from above the front end of the first flange portion. A plurality of pieces are provided in the left-right direction and a caulking plate is provided, and an upper end of the casing is fitted into the opening, and the opening is engaged with the first flange portion. The second portion is provided via a frame-shaped packing that surrounds the opening. A reinforcing flange plate disposed below the flange portion and the caulking plate and having a through hole through which the front caulking piece penetrates; and the first flange portion includes left and right end edges and a rear end edge of the second flange. It is characterized in that it is caulked and fixed by the caulking piece of the portion via the reinforcing flange plate, and that the front edge is caulked and fixed by the front caulking piece which penetrates the through hole of the reinforcing flange plate.
According to a second aspect of the present invention, in the configuration of the first aspect, the exhaust casing is provided with a rectifying plate for forming an exhaust passage in the exhaust hood, and the caulking plate is integrally formed on a lower surface of the rectifying plate. It is characterized by being provided.
According to a third aspect of the present invention, in the configuration of the second aspect, the packing has a frame-shaped portion that overlaps the second flange portion and the rear end of the caulking plate and circulates around the opening, and the frame-shaped portion. On both sides of the front end of the, the extended portion that overlaps the mating portion of the second flange portion and the current plate is projected.

According to the invention as set forth in claim 1, even in the exhaust hood projecting to the front side of the heat exchanger, the front end edge of the first flange portion can be satisfactorily caulked and fixed by the caulking plate, and the sealing performance is improved. Can be secured.
According to the invention described in claim 2, in addition to the effect of claim 1, since the caulking plate is integrally provided on the lower surface of the flow regulating plate, the caulking plate can be assembled at an appropriate position by the flow regulating plate. Also, the number of parts does not increase. Therefore, manufacturing cost and management cost can be suppressed.
According to the third aspect of the invention, in addition to the effect of the second aspect, the seam between the second flange portion and the current plate can be reliably sealed by the extended portion provided on the packing. Therefore, higher sealability can be secured.

It is a perspective view from the lower part of the bath water heater. It is a front view in the state where the front cover was removed. It is the sectional view on the AA line of FIG. FIG. 3 is a front view showing a state in which a lower cover and a surface sensor are removed in FIG. 2. It is a perspective view of a water side component. It is a perspective view from the lower part of the inner case. It is explanatory drawing which shows the state which took out the water side component. It is a perspective view of a cradle. (A) is an enlarged view of the pedestal portion in FIG. 2, and (B) is an enlarged view of the pedestal portion in FIG. 3. It is a perspective view from the lower part of an exhaust hood. It is a central longitudinal cross-sectional view of an exhaust hood portion. It is an exploded perspective view of an exhaust hood (excluding a reinforcing flange plate). It is a bottom view of the exhaust hood which omitted the reinforcing flange plate. It is a disassembled perspective view of the exhaust hood which shows a reinforcing flange plate separately.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a perspective view showing a bath water heater which is an example of a water heater, FIG. 2 is a front view with a front cover removed, and FIG. 3 is a sectional view taken along the line AA of FIG. This bath water heater 1 has a housing 2 surrounded by a top plate 3, a bottom plate 4, left and right side plates 5, 5, and a back plate 6, and a front opening 7 of the housing 2, except for the front surface. And a removable front cover 8 for closing. An exhaust pipe 9 extending in the left-right direction is projected from the upper part of the front cover 8, and intake ports 10, 10... Are formed in the lower part. The bottom plate 4 has a hot water outlet 11 connected to an external hot water tap, a water inlet 12 connected to a water pipe from the outside, a gas inlet 13 connected to a gas pipe from the outside, an outlet 14 and a return port 15 connected to a bath. Each is provided. Reference numerals 16 and 16 denote metal fittings provided on the upper and lower sides of the back plate 6 for wall mounting.

Inside the case 2, an inner case 17 is provided on the upper part. The inner case 17 is formed by installing a burner unit 18, a heat exchanger 19, and an exhaust hood 20 in this order from below.
First, the burner unit 18 has a lower casing 21 that communicates with the heat exchanger 19, and at the bottom of the lower casing 21, there are a first burner group for hot water supply and a second burner group for reheating the bath (not shown). The first burner group is arranged side by side in the left-right direction (here, the first burner group is on the right side and the second burner group is on the left side). On the front side of the lower casing 21, there is provided a nozzle stand 22 which is installed toward the rear end of the mixing pipe provided in each burner and which supports a nozzle (not shown) connected to the gas inlet 13 via the gas pipe. There is. Reference numeral 23 is an upper cover for covering the front side of the nozzle base 22, and 24 is a lower cover for covering the piping side and partitioning wiring under the nozzle base 22. Below the burner unit 18, combustion air is supplied to each burner group. An air supply fan 25 (FIG. 4) is provided.

Next, the heat exchanger 19 has a square tubular middle casing 26 that communicates with the lower casing 21, and inside the middle casing 26, there is a hot water supply side heat exchanger located above the first burner group, and a second The heat exchangers on the bath side located above the burner group are juxtaposed in the left-right direction. Then, inside the lower casing 21 and the middle casing 26, a partition member (not shown) for partitioning between the first burner group and the second burner group and between the hot water supply side heat exchanger and the bath side heat exchanger It is partitioned into a first combustion chamber on the right side in which the one burner group and the heat exchanger on the hot water supply side are arranged, and a second combustion chamber on the left side in which the second burner group and the heat exchanger on the bath side are arranged.

As shown in FIG. 11, the hot water supply side heat exchanger and the bath side heat exchanger pass through the fins 28, 28,... It has a plurality of heat transfer tubes 27, 27... Which are arranged in parallel. Adjacent heat transfer pipes 27, 27 are alternately connected to each other by U-shaped connecting pipes 29, 29... Outside the middle casing 26, so that a series of meandering connected heat exchangers are formed. It is a tubular body. The connection pipe 29 of each heat exchanger is provided with a bimetal switch 30 for detection of empty heating. Reference numeral 31 is a surface sensor that detects damage to the inner casing 26.

Further, the upstream end of the pipe body of the hot water supply side heat exchanger is connected to the downstream end of a water inlet pipe 32 connected to the water inlet 12 via a water side component 40 described later, and the downstream end of the pipe body is connected to the downstream end. A hot water outlet pipe 33 connected to the hot water outlet 11 is connected. Further, a bypass pipe 34 that bypasses the hot water supply side heat exchanger is connected between the water side component 40 and the hot water discharge pipe 33.
On the other hand, a forward pipe 35 connected to the outlet 14 is connected to the downstream end of the pipe of the bath-side heat exchanger, and a return pipe 36 connected to the return port 15 is connected to the upstream end of the pipe. It is connected. A bath circulation pump 37 has a drop pipe 38 connected to the outgoing pipe 33 for branching, which is connected to the outgoing pipe 35 and is used to fill the bathtub with the hot water of the outgoing pipe 33.

(Explanation of water side parts)
Then, the water inlet 12, the upstream end of the water inlet pipe 32, and the upstream end of the bypass pipe 34 are branched and connected via the water side component 40.
As shown in FIG. 5, this water-side component 40 is connected to the water inlet 12 and is connected to the upstream side path portion 41 and the downstream side of the upstream side path portion 41, and is connected to the water inlet pipe 32. It has a three-pronged structure including a portion 42 and a second passage portion 43 that is branched and connected to the upstream passage portion 41 and is connected to the bypass pipe 34.
First, the upstream side passage portion 41 includes a downward pipe 45 having a water amount sensor 46 in a total amount throttle portion 44 provided with a water amount control valve in an internal flow passage, and a forward pipe 47 connected to the first passage portion 42. The first stepping motor 48 is provided in the total amount throttle portion 44 so that the opening of the water amount control valve (the flow passage area of the total amount throttle portion 44) is continuous. It can be changed.

The first path portion 42 is a forward-facing pipe body that is connected to the forward tube 47 of the upstream path portion 41, and the water inlet pipe 32 is connected thereto. The water inlet pipe 32 here is the first path portion 42. It is divided into an upstream side first water inlet pipe 32A connected to and a downstream second water inlet pipe 32B connected to the hot water supply side heat exchanger as shown in FIG.
The first water inlet pipe 32</b>A has an L shape in which the lower end is inserted and connected to the first path portion 42, extends forward, and then bends upward, and the lower end is screwed to the first path portion 42. It is fixed to the first path portion 42 by the fixing metal fitting 49 in a state that it does not come off. First locking flanges 50, 50 are provided around the outer periphery of the upper end.
On the other hand, a large diameter portion 51 into which the first locking flanges 50, 50 and the upper end of the first water inlet pipe 32A can be fitted is formed at the lower end of the second water inlet pipe 32B. A locking flange 52 is provided around.

The upper end of the first water inlet pipe 32A is inserted into the large diameter portion 51 of the second water inlet pipe 32B together with the first locking flanges 50, 50 via a seal member (not shown), and in this state, the first water inlet pipe 32A is engaged over both pipes. The first and second water inlet pipes 32A and 32B are connected by using the clip member 53 that stops (hereinafter, referred to as "first clip member 53A" when distinguished from other clip members). The clip member 53 has the same structure as that used for the bypass pipe 34 and the upstream path portion 41 side, and as shown in the lower side of FIG. And a pair of clamp portions 55 and 55 that are curved and formed on both sides of the knob portion 54 in accordance with the outer shape of the water inlet pipe 32. By forming the folded-back portions 56, 56 that are bent in the opposite directions, the clamp portions 55, 55 can be elastically deformed in the expanding direction. Further, a locking slit 57 extending in the longitudinal direction is formed across each clamp portion 55 and the folded portion 56.

The locking slit 57 extends in the width direction in a state where the upper end of the first water inlet pipe 32A is inserted into the large diameter portion 51 of the second water inlet pipe 32B and is elastically sandwiched by the clamp portions 55 of the clip member 53. One inner edge is locked to the first locking flange 50, and the other inner edge is locked to the second locking flange 52, so that both locking flanges 50, 52 are locked in the locking slit 57 and the pipes are connected to each other. It is intended to prevent slipping out. Here, since the outer diameter of the first water inlet pipe 32A and the outer diameter of the large diameter portion 51 of the second water inlet pipe 32B are different from each other, in the clamp portion 55, the bending radius is changed on both sides of the locking slit 57. It corresponds to both tubes respectively.

Next, the second path portion 43 includes a bypass throttle portion 58 in which a bypass amount control valve is provided in an internal L-shaped flow path, and a second stepping motor capable of continuously changing the opening degree of the bypass amount control valve. 59, the upstream end of the flow path is connected to the first path portion 42 from above, and the bypass pipe 34 is connected to the downstream end of the flow path from the front. However, the bypass pipe 34 here is also connected to the upstream first bypass pipe 34A connected to the second path portion 43, and the downstream pipe connected to the hot water discharge pipe 33 as shown in FIG. It is divided into the second bypass pipe 34B on the side.
The first bypass pipe 34A has a lower end fixed to the downstream end of the second path portion 43 in a retaining state by a fixing member 60 screwed to the second path portion 43, extends forward from there, and then extends upward. The first locking flanges 61, 61 are provided around the outer periphery of the upper end in a bent shape that is bent and the upper end curves backward.

On the other hand, a large diameter portion 62 into which the upper end of the first bypass pipe 34A can be fitted together with the first locking flange 61 is formed at the lower end of the second bypass pipe 34B, and the second locking is made at the lower end of the large diameter portion 62. A flange 63 is provided around.
The upper end of the first bypass pipe 34A is inserted into the large diameter portion 62 of the second bypass pipe 34B together with the first locking flange 61 via a seal member (not shown), and in this state, the first bypass pipe 34A is locked across both pipes. By using the clip member 53 (hereinafter, referred to as “second clip member 53B” when distinguished from other clip members), the first and second water inlet pipes 32A and 32B can be treated similarly to the first and second water inlet pipes 32A and 32B. Bypass pipes 34A and 34B are connected. That is, the clip member 53 is elastically sandwiched between the pipes and the locking flanges 61 and 63 formed at the ends of the locking slit 57 are locked to prevent the clip member 53 from slipping off. Is.

A vertical joint pipe 64 (FIGS. 4 and 5) is interposed in the connection between the upstream passage portion 41 and the water inlet 12, and the lower end of the downward pipe 45 of the upstream passage portion 41 and the joint pipe 64 are connected. The clip member 53 (hereinafter, referred to as “third clip member 53C” when distinguished from other clip members) is also used for the connection with the upper end, and the connection between the water inlet 12 and the lower end of the joint cylinder 64. Also, the clip member 53 is used. That is, the clip member 53 is elastically sandwiched between the respective cylinders, and the retaining slits 57 are engaged with the retaining flanges formed at the end portions of the respective barrels to prevent the clip member 53 from slipping off. It is a thing.

In the water-side component 40 assembled in this way, the first stepping motor 48 is located at the rearmost (rearmost) side in the housing 2 and in front of it, the forward-facing cylinder 47 of the upstream-side passage portion 41 and the first passage portion 42 are provided. Linearly extend forward, and the second path portion 43 and the second stepping motor 59 are located above the first path portion 42. The first water inlet pipe 32A crosses upward in front of the first and second path portions 42, 43, and the first bypass pipe 34A crosses upward in the rear thereof. That is, the water-side component 40 is housed in the space in the front-rear direction near the lower center of the inner barrel 17 in the housing 2, and above the joint cylinder 64, there are almost no other components in the front. There is.
Therefore, when taking out the water-side component 40 for maintenance or the like, the first clip member 53A connecting the first water inlet pipe 32A and the second water inlet pipe 32B, the first bypass pipe 34A, and the second bypass pipe 34B are connected. If the three second clip members 53B that connect to each other and the third clip member 53C that connects the downward pipe 45 and the joint pipe 64 to the upstream path portion 41 are respectively removed, the water-side component 40 is forwarded as it is as shown in FIG. Can be easily pulled out to.

On the contrary, when assembling the water-side component 40, if the first stepping motor 48 is first pushed into the housing 2 from the front, it can be positioned at the assembly position as it is. At this assembly position, the upper end of the first water inlet pipe 32A faces the connecting direction near the lower end of the second water inlet pipe 32B, and the upper end of the first bypass pipe 34A also faces the connecting direction near the lower end of the second bypass pipe 34B. Since the cylinder 45 is placed on the joint cylinder 64, it can be smoothly sandwiched and fixed by the clip members 53.
It should be noted that, here, since the pipe between them is also locked by the clip member 53 between the forward-facing cylinder 47 of the upstream path portion 41 and the first path portion 42, the upstream path portion 41 and the first path portion 42 can be easily separated and connected.

(Explanation of electrical box)
An electric equipment box 65 is housed inside the side plate 5 on the right side of the water side component 40. The electrical equipment box 65 has a rectangular box shape having a small left-right width and a front-rear width slightly smaller than the side plate 5, and a controller 66 made of an electrical equipment substrate is vertically accommodated on the inner right side. The controller 66 is provided in the water amount sensor 46 provided in the water side component 40, the first and second stepping motors 48 and 50, the bimetal switch 30, the igniter for burner ignition, the upstream side path portion 41, the hot water outlet pipe, and the like. The thermistor 67 for temperature detection, the air supply fan 25, the electric material parts such as the pump 37, and the like are electrically connected via wiring.

The lower surface of the electrical equipment box 65 is supported by a pedestal 68 provided on the bottom plate 4, and the upper portion is supported by a connecting plate 69 that is provided between the pedestal 68 and the front surface of the nozzle base 22 of the burner unit 18. Further, a protruding portion 70 is formed downward on the lower surface of the electrical component box 65, and a retaining pin 71 having a length larger than the lateral width of the protruding portion 70 is orthogonally penetrated and fixed to the protruding portion 70. ing.
As shown in FIG. 8, the cradle 68 is formed by bending a metal strip plate to support the upper plate portion 72 in the front-rear direction and the front end of the upper plate portion 72, and the lower end thereof is bent forward. A U-shaped member in a side view having an L-shaped front plate portion 73 and an L-shaped rear plate portion 74 that supports the rear end of the upper plate portion 72 and has its lower end bent backward. The lower end of the plate portion 73 and the lower end of the rear plate portion 74 are screwed to the bottom plate 4, so that the upper plate portion 72 is fixed in parallel with the bottom plate 4.

A slit 75 is formed in the upper plate portion 72 from the front end toward the rear. The slit 75 is formed to have a width larger than the lateral width of the protruding portion 70 of the electrical equipment box 65 and smaller than the length of the retaining pin 71. However, the front end of the slit 75 is formed in a taper shape that becomes wider as it goes forward, and the upper end of the front plate portion 73 communicates with the front end of the slit 75, and the protruding portion 70 including the retaining pin 71 passes therethrough. A doorway 76 having a possible width is formed.
Therefore, the protruding portion 70 can be moved in and out of the lower side of the upper plate portion 72 in the front-rear direction by passing through the inlet/outlet 76, and the protruding portion 70 is positioned below the upper plate portion 72 by being guided by the slit 75. Then, the protrusion 70 is retained by the retaining pin 71 that protrudes to the left and right. In this retaining state, the electrical equipment box 65 is placed on the pedestal 68.

On the other hand, between the lower casing 21 of the burner unit 18 and the electrical equipment box 65, a pipe through which the water inlet pipe 32, the hot water outlet pipe 33, and the bypass pipe 34 arranged between the inner case 17 and the right side plate 5 pass. It is space 77.
The connecting plate 69 has a V-shape when viewed from the front, is shaped so as to cross the piping space 77 between the water inlet pipe 32 and the hot water outlet pipe 33, and is installed between the nozzle base 22 and the electrical equipment box 65. Specifically, the left end is fixed to the front surface of the nozzle base 22 with a screw 78A, and the right end is fixed to the back surface of a fixing piece 79 projecting upward from the front plate of the electrical equipment box 65 with a screw 78B. It In this state, no other component is crossed between the electrical component box 65 and the front cover 8, and the front of the electrical component box 65 is open.

Therefore, when assembling the electrical equipment box 65, the projection 70 can be inserted into the upper plate portion 72 of the pedestal 68 from the rear surface and slid inward so that the projecting portion 70 can move the upper plate portion 72, as shown in FIG. It enters the slit 75 and is placed on the pedestal 68 in a state in which it is retained by the retaining pin 71. At this time, on the upper side, the fixing piece 79 contacts the right end of the connecting plate 69. Therefore, if the fixing piece 79 is fixed to the right end portion with the screw 78B, the assembling work is completed.
On the contrary, when the electrical equipment box 65 is taken out, the screw 78B at the right end portion of the connecting plate 69 is removed to release the fixation with the fixing piece 79, and the electrical equipment box 65 is directly placed on the upper plate portion 72 of the pedestal 68. The guide portion 70 can be slid forward and pulled out while the slit 75 is guided by the slit 75. At this time, since the retaining pin 71 can pass through the doorway 76, it does not interfere with the front plate portion 73. When performing maintenance or the like on the nozzle base 22, only the screw 78A at the left end of the connecting plate 69 is removed, and the connecting plate 69 is rotated toward the electrical equipment box 65 side around the screw 78B to retract from the front of the nozzle base 22. If so, the nozzle base 22 can be taken out without removing the connecting plate 69.

(Explanation of exhaust hood)
Then, as shown in FIGS. 10 and 11, the exhaust hood 20 is fixed to the upper side of the middle casing 26 of the heat exchanger 19, and has a cover-shaped exhaust casing 80 having an open front surface that covers the left and right and rear portions, and the exhaust casing. A straightening plate 81 provided inside 80, a swaging plate 82 fixed to the lower surface of the straightening plate 81, a reinforcing flange plate 83 swaging fixed to the lower surface of the exhaust casing 80 together with the middle casing 26, and a straightening plate 81 and reinforcement. And a packing 84 disposed between the flange plate 83 and the flange plate 83.
In the exhaust casing 80, a mounting plate 85 for mounting the exhaust pipe 9 is formed upright on the outer periphery of the opening, and the height increases as going from the opening to the rear, and the rear is the highest bulging portion 86. As shown in FIG. 12, an upper flange portion 87 is formed along the outer periphery of the left and right sides and a rear portion of the rear portion, and a downward outward turnback portion 88 is formed along the entire periphery of the upper flange portion 87. ing. A plurality of caulking pieces 89, 89... Are provided at the outer folded-back portion 88 so as to project downward at predetermined intervals.

The current plate 81 has a rectangular plate shape in a plan view having a width that fits into the lower surface of the exhaust casing 80, and has a horizontal part 90 on the front side and an inclined part 91 that rises rearward on the back side thereof. The rear end of the inclined portion 91 is formed in a U-shape by being folded back upward in the bulging portion 86. At the front end of the horizontal portion 90, mounting pieces 92, 92,... Which project downward on the same vertical plane as the mounting plate 85 of the exhaust casing 80 are formed. The right and left side edges of the straightening vane 81 and the folded-back end portions of the inclined portion 91 are provided with rising pieces 93, 93 that come into contact with the left and right inner surfaces of the exhaust casing 80, and the rising pieces 93, 93 are exhausted. The casing 80 is screwed to the left and right inner surfaces.

Therefore, in the exhaust casing 80, after moving rearward along the inclined portion 91 below the straightening vane 81, it wraps up along the folded end portion of the straightening vane 81 and makes a U-turn forward, so that the straightening vane is formed. An exhaust passage is formed above 81 to reach the opening by moving forward.
The caulking plate 82 is a band plate that is welded to the left and right recesses 94 provided in the horizontal portion 90 of the straightening plate 81. The caulking plate 82 has a front convex caulking piece 95, 95 having an inverted convex shape at the front edge of the caulking plate 82. -Is formed by cutting and raising downward at a predetermined interval.

The reinforcing flange plate 83 has left and right ends and a rear end formed along the inside of the outer folded portion 88 of the exhaust casing 80, and a front end formed along the inside of the attachment piece 92 of the flow straightening plate 81, and has a quadrangular outer shape. On the outer periphery of the metal plate, an inner folded portion 96 which overlaps the outer folded portion 88 and the inside of the mounting piece 92 is provided so as to face downward. A rectangular opening 97 into which the upper end of the middle casing 26 is fitted is formed at the rear side of the reinforcing flange plate 83, and a downward hanging portion 98 is provided along the inner circumference of the opening 97. .. On the front side of the opening 97, a plurality of left and right through holes 99, 99 through which the front crimping pieces 95 of the crimping plate 82 penetrate along the rear edge are formed. A downward squeezed portion 100 is provided around the inner circumference of each through hole 99.

Similar to the reinforcing flange plate 83, the packing 84 has left and right ends and a rear end formed along the inside of the outer folded portion 88 of the exhaust casing 80, and the front end is positioned behind the front crimping piece 95 of the crimping plate 82. It has a quadrangular frame-shaped portion 101 that circulates along the outer periphery of the opening 97 and is made of an elastic material. Front and left ends of the frame-shaped portion 101 are extended until they come into contact with the mounting pieces 92, and are extended portions 102 that are wider than the frame-shaped portion 101. As shown in FIG. 13, the extending portion 102 straddles the upper flange portion 87 of the exhaust casing 80 and the horizontal portion 90 of the rectifying plate 81 to come into contact with each other.

In this exhaust hood 20, a straightening plate 81 to which a caulking plate 82 is fixed is assembled inside the exhaust casing 80 and screwed. On the other hand, on the reinforcing flange plate 83, the upper end of the middle casing 26 is fitted into the opening 97, and the lower flange portion 103 (FIG. 11) provided on the upper end peripheral edge of the middle casing 26 is fitted to the peripheral edge of the opening 97 from above. Lock it.
Next, as shown in FIG. 14, with the packing 84 positioned inside the outer folded portion 88 of the exhaust casing 80 and inside the front caulking piece 95, the exhaust casing 80 is assembled to the upper surface of the reinforcing flange plate 83. , The front caulking pieces 95, 95 ··· are passed through the through holes 99, 99 · ·. Then, each caulking piece 89 of the exhaust casing 80 is folded back inward, and as shown in FIG. 11, the upper folded lower flange portion 103 together with the inner folded portion 96 of the reinforcing flange plate 83 is caulked and fixed. On the other hand, when the front caulking pieces 95 are folded back and the lower flange portion 103 together with the narrowed portion 100 together with the reinforcing flange plate 83 is caulked and fixed, the fixing of the exhaust hood 20 is completed. Finally, the exhaust pipe 9 may be screwed to the mounting plate 85 of the exhaust casing 80 and the mounting piece 92 of the flow regulating plate 81.

(Explanation of water heater operation)
In the bath water heater 1 configured as described above, when the hot water tap of the pipe connected to the hot water outlet 11 is opened and water is passed through the equipment, the water from the water inlet 12 passes through the water side component 40. Through the water inlet pipe 32 and the heat transfer pipe 27 of the hot water supply side heat exchanger. On the other hand, the controller 66, which has detected water flow by the water amount sensor 46 of the water side component 40, ignites the first burner group and rotates the air supply fan 25 to supply combustion air to the first burner group. Combustion exhaust gas of the first burner group is heat-exchanged with the heat transfer pipe 27 by passing through the hot water supply side heat exchanger in the first combustion chamber, hot water of a predetermined temperature is tapped from the tap pipe 33, and the pipe is tapped from the tap port 11. Supplied from the hot water tap.

On the other hand, when the hot water filling switch provided on the remote controller (not shown) is turned on, the controller 66 ignites the first burner group to discharge hot water of a predetermined temperature from the hot water discharge pipe 33, and the hot water discharge pipe 33 and the forward flow pipe 35. A control valve (not shown) of the drop pipe 38 provided therebetween is opened to supply the hot water from the hot water discharge pipe 33 to the bathtub through the drop pipe 38 and the outflow pipe 35. When a predetermined amount of hot water is supplied, the filling of water is stopped.
Further, when the additional heating switch of the remote control is turned on, the controller 66 drives the pump 37 to ignite the second burner group and rotates the air supply fan 25 to supply the combustion air to the second burner group. The hot water from the bathtub passes through the heat transfer tube 27 of the bath side heat exchanger, and the combustion exhaust of the second burner group exchanges heat with the heat transfer tube 27 by passing through the bath side heat exchanger in the second combustion chamber. It Therefore, the hot water in the bathtub is circulated and reheated.

Then, the combustion exhaust gas that has passed through the heat exchanger 19 enters the exhaust casing 80 through the opening 97 of the reinforcing flange plate 83 of the exhaust hood 20, flows from below the straightening plate 81 through the exhaust passage to the upper side, and is discharged. It is discharged from the cylinder 9 to the outside of the device. At this time, even if the exhaust hood 20 projects forward from the middle casing 26 of the heat exchanger 19, the reinforcing flange plate 83 and the middle casing 26 are separated from each other by the front crimping piece 95 of the crimping plate 82 immediately in front of the opening 97. Since it is caulked and fixed, the sealing property can be maintained. Particularly, since the packing 84 circulates along the opening 97, more reliable sealing is possible.

(Effects of invention relating to electrical box)
According to the bath water heater 1 of the above-described mode, the protruding portion 70 protruding downward and the retaining pin 71 protruding leftward and rightward from the protruding portion 70 are provided on the lower surface of the electrical equipment box 65, while being housed in the housing 2. The pedestal 68 having the upper plate portion 72 on which the electrical component box 65 in the state is placed is provided, and the upper plate portion 72 of the pedestal 68 is larger than the left and right width of the projecting portion 70 and the left and right length of the retaining pin 71. A slit 75 having a narrower width is provided in the front-rear direction so that the protrusion 70 can enter and exit below the upper plate 72 through the slit 75, and does not come off when entering below the upper plate 72. By being guided in the front-rear direction by the slit 75 while being prevented from coming off by the pin 71, the electrical equipment box 65 can be taken in and out of the mounting position on the receiving base 68. Therefore, the electrical equipment box 65 can be smoothly taken in and out, and can be easily fixed without disturbing other components such as piping. Further, since it is temporarily fixed on the pedestal 68 in the housing 2, the fixing work can be performed easily.

In particular, here, the cradle 68 is provided upward to the bottom surface of the housing 2 with the front plate portion 73 and the rear plate portion 74 supporting the upper plate portion 72, and the front plate portion 73 has the front end of the slit 75. Since the entrance and exit 76 that communicates with the projection 70 including the retaining pin 71 can pass therethrough and the projection 70 can enter the slit 75 through the entrance and exit 76, the upper plate portion 72 can be moved forward and backward. It can be supported to form a compact pedestal 68 having a small lateral width. Further, even if the front plate portion 73 is provided, it does not hinder the protrusion 70 from coming in and out.

Further, a combustion chamber is arranged in the housing 2 above the electrical equipment box 65, and a plurality of pipes are arranged side by side in the front-rear direction between the lower casing 21 of the combustion chamber and the electrical equipment box 65. Since the connecting plate 69, which is formed with 77 and passes through the gap between the pipes in the pipe space 77, is installed between the nozzle base 22 on the lower casing 21 side and the electrical equipment box 65, the electrical equipment box is attached to the housing 2. The electrical equipment box 65 can be fixed in the housing 2 by utilizing the nozzle base 22 on the lower casing 21 side without providing the fixing portion of 65.
Further, a fixing piece 79 of the electrical equipment box 65 with the connecting plate 69 is formed so as to project upward from the electrical equipment box 65, and one end of the connecting plate 69 is fixed to the fixing piece 79 and the other end thereof is fixed to the nozzle base 22 with a screw. By doing so, the upper part of the electrical component box 65 can be easily fixed and released. Further, by removing the screw 78A on the nozzle base 22 side of the connecting plate 69 and rotating the connecting plate 69 toward the electrical equipment box 65 side around the screw 78B on the fixing piece 79 side, the connecting plate 69 is attached to the electrical equipment box 65. It can be evacuated from the piping space 77 as it is. Therefore, the nozzle base 22 can be easily removed.

The shape of the electrical equipment box is not limited to the above-mentioned form, and may be a box body in which the six sides are completely closed, or conversely a U-shape in front view composed of a top plate, a bottom plate, and side plates that connect both plates. And so on. As for the protrusion, the protrusion can be integrally provided on the side surface of the protrusion as a retaining portion.
The shape of the pedestal can be appropriately changed by extending the side plate portions to the left and right of the upper plate portion, forming the front plate portion by a pair of left and right leg plates, and the like. In addition, the front plate and the rear plate are eliminated so that the upper plate is supported by the left and right side plate portions of the upper plate, and a rising portion that is bent upward from the side edge of the upper plate is provided. Alternatively, the front view may be L-shaped and the rising portion may be fixed to the side plate of the housing to support the upper plate portion.
The position of the fixing piece may be provided on the upper plate instead of the front plate or may be a screw boss shape facing forward.

(Effects of invention relating to water side parts)
According to the bath water heater 1 of the above-mentioned form, the water inlet pipe 32 is connected to the first path portion 42 of the water side component 40, and the upstream first water inlet pipe 32A and the downstream side connected to the heat exchanger 19. The second water inlet pipe 32B, and the downstream end of the first water inlet pipe 32A and the upstream end of the second water inlet pipe 32B are separably connected by a first clip member 53A elastically engaging them. Thus, the bypass pipe 34 is divided into an upstream first bypass pipe 34A connected to the second passage portion 43 of the water side component 40 and a downstream second bypass pipe 34B connected to the hot water outlet pipe 33. Since the downstream end of the first bypass pipe 34A and the upstream end of the second bypass pipe 34B are separably connected by the second clip member 53B that elastically engages them, the first and the first By attaching/detaching the two clip members 53A, 53B, it is possible to easily perform the assembling work and the removing work of the water side component 40 to/from the housing 2. Therefore, it leads to improvement in productivity and maintainability. In particular, since the water inlet pipe 32 and the bypass pipe 34 are divided and one of them is integrated with the water side component 40, the water inlet pipe 32 and the bypass pipe 34 can be connected and disconnected smoothly, and each pipe can be connected. No unnecessary stress is applied.

In particular, here, the upstream path portion 41 is connected to the water inlet 12 via the joint cylinder 64 connected to the water inlet 12, and the downstream end of the joint cylinder 64 and the upstream path portion 41 are connected to both. Since the third clip member 53C elastically engaged with each other allows the water-side component 40 to be detachably connected, the water-side component 40 can be removed more smoothly.
In addition, the second water inlet pipe 32B and the second bypass pipe 34B are disposed in front of and behind the casing 2 in the depth direction, respectively, and are arranged downward, and the first route portion 42 and the second route portion of the water side component 40 are disposed. 43 is formed toward the opening 7 side of the housing 2, the second stepping motor 59 of the bypass throttle portion 58 is arranged above the second path portion 43, and the first water inlet pipe 32A is arranged on the opening 7 side. After being extended, the first bypass member 34A is bent upward and is connected to the second water inlet pipe 32B by the first clip member 53A, and the first bypass pipe 34A is bent upward on the opening 7 side of the second stepping motor 59. Since it is connected to the second bypass pipe 34B by the second clip member 53B, the first water pipe 32A and the first bypass pipe 34A are piped on the front side of the second stepping motor 59, and the second water pipe 32B and the second water pipe 32B are respectively connected. 2 is connected to the bypass pipe 34B. Therefore, the water side component 40 can be formed in a space-saving manner, and the water side component 40 can be easily removed without interfering with other components.

The dividing position of the water inlet pipe and the bypass pipe is not limited to the above-mentioned form, and may be set further downstream as long as there is no hindrance to taking in and out of the water side component, or the position where the water inlet pipe and the bypass pipe are divided from each other. May be separated. The first path portion and the second path portion may be arranged upside down, or may be arranged side by side depending on the space inside the housing.
Further, in the above-described embodiment, the upstream path portion is connected to the water inlet through the joint tube, but the joint tube may be removed and the upstream path portion may be directly connected to the water inlet by a clip member.
Further, the form of the clip member can be changed as appropriate, for example, the folded-back portion is formed into a curl shape, the wire is bent instead of the strip-shaped plate to form the left and right clamp portions, or two strip-shaped plates are combined. It is also conceivable to have a structure for doing.

(Effects of invention relating to exhaust hood)
According to the bath water heater 1 of the above-described mode, the exhaust hood 20 has a front portion that projects forward from the heat exchanger 19 and opens, and the left and right portions and the rear portion are closed so that the exhaust hood 20 is disposed above the left and right and rear portions of the middle casing 26. The upper and lower flange portions 87 having a plurality of caulking pieces 89 for caulking and coupling the lower flange portion 103 to the left and right end edges and the rear end edge are provided around the exhaust casing 80 and the lower surface of the exhaust casing 80. Direction, and a plurality of front caulking pieces 95 protruding downward from above the front end of the lower flange portion 103 are provided in the left-right direction, and the upper end of the middle casing 26 is fitted to form the lower flange portion 103. A through hole that has an opening 97 for locking and is arranged below the upper flange portion 87 and the caulking plate 82 via a frame-shaped packing 84 that surrounds the periphery of the opening 97, and through which the front caulking piece 95 penetrates. The lower flange portion 103 includes a reinforcing flange plate 83 having a hole 99, and left and right end edges and a rear end edge of the lower flange portion 103 are caulked and fixed by the caulking piece 89 of the upper flange portion 87 via the reinforcing flange plate 83. At the same time, the front edge is caulked and fixed by a front caulking piece 95 penetrating the through hole 99 of the reinforcing flange plate 83. Therefore, even with the exhaust hood 20 that projects to the front side of the heat exchanger 19, the front edge of the lower flange portion 103 can be satisfactorily caulked and fixed, and the sealing performance can be ensured.

Particularly, here, the exhaust casing 80 is provided with a rectifying plate 81 for forming an exhaust passage in the exhaust hood 20, and the caulking plate 82 is integrally provided on the lower surface of the rectifying plate 81, The rectifying plate 81 allows the caulking plate 82 to be assembled at an appropriate position, and does not increase the number of parts. Therefore, manufacturing cost and management cost can be suppressed.
The packing 84 has a frame-shaped portion 101 that overlaps the upper flange portion 87 and the rear end of the caulking plate 82 and circulates around the opening 97, and the upper flange portion is provided on both sides of the front end of the frame-shaped portion 101. Since the extending portions 102, 102 which overlap the portion where the 87 and the current plate 81 are overlapped with each other project, the joint between the upper flange portion 87 and the current plate 81 can be reliably sealed. Therefore, higher sealability can be secured.

The number and shape of the crimping pieces and the front crimping pieces are not limited to the above-mentioned form, and can be changed as appropriate. The caulking plate may not be provided integrally with the rectifying plate, but may be installed as a separate member on the lower surface of the exhaust casing in the left-right direction.
As for the shape of the packing, if further sealing is required, the width of the left and right extended parts can be increased, or the entire left and right extended parts can be connected with the packing except the opening in the frame-shaped part. Good.

Further, in common with each invention, the piping form of the water inlet pipe, the hot water outlet pipe, the bypass pipe and the like is not limited to the above-described form, and the arrangement of the water side component and the electrical equipment box is not limited to the above-described form. Therefore, the water side component may be further arranged on the right side in the housing, or the electric equipment box may be arranged along the left side plate.
Further, in the above-mentioned embodiment, the bath water heater capable of filling and reheating the bathtub is described, but each invention can be applied to a water heater having no bath function.
On the other hand, each invention relating to the electrical equipment box and the water side component is applicable not only to the sensible heat recovery type water heater but also to the latent heat recovery type water heater. Further, each invention relating to the exhaust hood and the electrical equipment box can be applied to a water heater which is not a bypass mixing type.

1・・Bath water heater, 2・・Housing, 7・・Opening, 8・・Front cover (cover), 11・・Hot water outlet, 12・・Water inlet, 13・・Gas inlet, 14・・Outlet , 15... Return port, 17... Inner case, 18... Burner unit, 19... Heat exchanger, 20... Exhaust hood, 21... Lower casing, 22... Nozzle base, 26... Medium casing ( Casing), 32 ··· water inlet pipe, 32A · · 1st water inlet pipe, 32B · · 2nd water inlet pipe, 33 · · hot water pipe, 34 · · bypass pipe, 34A · · 1st bypass pipe, 34B · · 2nd By-pass pipe, 35 ··· Outgoing pipe, 36 ··· Return pipe, 40 · · Water side component, 41 · · Upstream side passage portion, 42 · · First passage portion, 43 · · Second passage portion, 44 · · Total amount Drawing part, 45... Downward cylinder, 47... Forward cylinder, 48... First stepping motor, 50, 61... First locking flange, 52, 63. Second locking flange, 53.. Clip member (53A: first clip member, 53B: second clip member, 53C: third clip member), 55... Clamping part, 57... Locking slit, 58... Bypass throttle part, 59... Second stepping motor (Actuator), 64 · · Joint tube (joint member), 65 · · electrical box, 66 · · controller, 68 · · pedestal, 69 · · connecting plate, 70 · · protrusion, 71 · · retaining pin ( 72.. Upper plate part, 73.. Front plate part, 74.. Rear plate part, 75.. Slit, 76.. Inlet/outlet, 77.. Piping space, 79.. Fixing piece (fixing part) ), 80... Exhaust casing, 81... Current plate, 82... Caulking plate, 83... Reinforcing flange plate, 84... Packing, 87... Upper flange part (second flange part), 89... Caulking piece , 95... Front caulking piece, 97.. Opening portion, 99.. Through hole, 101.. Frame portion, 102.. Extension portion, 103.. Lower flange portion (first flange portion).

Claims (3)

A heat exchanger provided with a first flange portion at the upper end opening of the casing;
A water heater fixed to the upper side of the heat exchanger, comprising: an exhaust hood having a front portion projecting forward of the heat exchanger and an exhaust pipe protruding from the front end.
The exhaust hood is
The front part projects forward from the heat exchanger and opens, the left and right parts and the rear part are closed and arranged on the left and right and the upper part of the rear part of the casing, and the first flange part is provided on the left and right end edges and the rear end edge. An exhaust casing around which a second flange portion having a plurality of caulking pieces for caulking is provided,
A caulking plate that is provided in the left-right direction on the lower surface of the exhaust casing, and that has a plurality of front caulking pieces that protrude downward from above the front end of the first flange portion in the left-right direction.
The casing has an opening to which the upper end of the casing fits and the first flange is locked, and the second flange and the caulking plate are provided via a frame-shaped packing that circulates around the opening. A reinforcing flange plate disposed on the lower side, the reinforcing flange plate having a through hole through which the front crimping piece penetrates,
The left and right end edges and the rear end edge of the first flange portion are caulked and fixed by the caulking piece of the second flange portion via the reinforcing flange plate, and the front end edge of the first flange portion is the reinforcing flange plate. A water heater characterized by being caulked and fixed by the front caulking piece which penetrates a through hole. 2. The exhaust casing is provided with a rectifying plate for forming an exhaust passage in the exhaust hood, and the caulking plate is integrally provided on a lower surface of the rectifying plate. Water heater described in. The packing has a frame-shaped portion that overlaps the second flange portion and the rear end of the caulking plate and circulates around the opening, and the second flange portion is provided on both sides of the front end of the frame-shaped portion. The water heater according to claim 2, wherein an extended portion that overlaps with a mating portion of the flow control plate and the straightening plate is projected.

Images