JP6642098B2 - Hot water equipment - Google Patents

Description

  The present invention relates to a hot water device.

  Conventionally, in hot water appliances such as instantaneous water heaters, each of a burner unit and a primary heat exchanger unit is separately incorporated in an outer case. For this reason, the combustion test of the hot water equipment cannot be performed until the burner unit and the primary heat exchanger unit are separately incorporated in the outer case and the hot water equipment is completed.

  Although there is no description about combustion inspection, Japanese Patent No. 4176670 (Patent Document 1) describes a water heater in which a burner unit and a primary heat exchanger unit are integrated. In the water heater described in this publication, the side wall of the primary heat exchanger unit and the side wall of the burner unit are formed of a single plate.

Japanese Patent No. 4176670

  In the water heater described in the above publication, the burner unit (burner block) is fixed to the side wall above the bottom wall. Therefore, when replacing either the burner unit or the primary heat exchanger unit, the fixing between the burner unit and the side wall must be released. Therefore, even if a combustion test was performed before the burner unit and the heat exchanger unit were integrated into the outer case in an integrated state, a defect was found in either the burner unit or the heat exchanger unit. At this time, it is difficult to replace either the burner unit or the heat exchanger unit.

  The present invention has been made in view of the above problems, and an object thereof is to perform a combustion test before a burner unit and a heat exchanger unit are incorporated in an outer case, and to perform a burner unit and a heat exchanger. An object of the present invention is to provide a hot water device that can easily replace any of the units.

  The hot water appliance of the present invention includes an outer case, an inner case, a burner unit, and a primary heat exchanger unit. The inner case is fixed in the outer case. The burner unit is mounted without being fixed in the inner case, and supplies the combustion gas. The primary heat exchanger unit is mounted without being fixed in the inner case, and recovers the sensible heat of the combustion gas supplied from the burner unit.

  According to the hot water equipment of the present invention, the burner unit and the primary heat exchanger unit are mounted without being fixed in the inner case. For this reason, a combustion test can be performed in a state where the burner unit and the primary heat exchanger unit are mounted on the inner case. Therefore, a combustion test can be performed before the burner unit and the primary heat exchanger unit are incorporated in the outer case. Further, since the burner unit and the primary heat exchanger unit are not fixed in the inner case, either the burner unit or the primary heat exchanger unit can be easily replaced.

  In the above-described hot water appliance, the inner case includes a front surface having the first through hole and a rear surface having the second through hole. The primary heat exchanger unit includes a primary heat exchanger heat transfer tube and a primary heat exchanger case that houses the primary heat exchanger heat transfer tube. The primary heat exchanger heat transfer tube includes a first protrusion protruding from the primary heat exchanger case to the front side, and a second protrusion protruding from the primary heat exchanger case to the rear side. The first protrusion projects from the front surface through the first through hole, and the second protrusion projects from the rear surface through the second through hole. For this reason, it is possible to reduce the size of the inner case by projecting the first projecting portion from the front portion through the first through hole and projecting the second projecting portion from the rear portion through the second through hole. . Further, the first protruding portion is protruded from the front surface portion through the first through hole, and the second protruding portion is protruded from the rear surface portion through the second through hole, so that the front surface portion and the rear surface portion face each other. The primary heat exchanger unit can be moved in and out of the inner case.

  The above-described hot water equipment further includes a blower unit for supplying combustion air to the burner unit. The blower unit includes a blower fan for blowing the combustion air, and a blower fan motor for rotating the blower fan. The blower motor is arranged outside the inner case. For this reason, the blower fan motor can be cooled. Thus, the life of the blower fan motor can be improved.

  In the above hot water appliance, the blower fan motor includes a drive shaft connected to the blower fan. The drive shaft extends in the direction in which the burner unit and the primary heat exchanger unit are stacked. For this reason, the drive mechanism such as the rotor and the stator of the blower fan motor can be arranged in a direction intersecting the direction in which the burner unit and the primary heat exchanger unit are stacked. Thereby, the dimension of the blower fan motor in the direction in which the burner unit and the primary heat exchanger unit are stacked can be reduced.

  The above-described hot water equipment is further provided with a secondary heat exchanger that is mounted without being fixed in the inner case and that recovers latent heat of the combustion gas supplied from the burner unit. For this reason, a combustion test can be performed in a state where the secondary heat exchanger is mounted on the inner case. Also, the secondary heat exchanger can be easily replaced. Further, the heat exchange efficiency can be improved.

  The above-mentioned hot water appliance further includes a support member fixed in the inner case and supporting the secondary heat exchanger. The support member includes a mounting portion on which the secondary heat exchanger is mounted, and a partition extending from the mounting portion to a side opposite to the primary heat exchanger unit. The partition is disposed at an interval from the inner case and has an opening. Therefore, the combustion gas from which the sensible heat has been recovered by the primary heat exchanger unit can flow from the opening to the secondary heat exchanger via the space between the inner case and the partition. Therefore, a function as a collecting cylinder can be added to the support member that supports the secondary heat exchanger.

  In the above-described hot water appliance, the mounting section has an outlet for discharging drain generated by recovering latent heat of the combustion gas in the secondary heat exchange. For this reason, the drain adhering to the mounting portion can be discharged from the discharge port. Therefore, a function as a drain pan can be added to the mounting portion.

  The above-described hot water device further includes an outer pipe and an inner pipe. The outer tube is attached to the outer surface of the inner case, and the first fluid flows. The inner pipe is inserted inside the outer pipe, and the second fluid having a higher temperature than the first fluid flows. Therefore, the first fluid can be heated by heat exchange with the second fluid. Further, the outer tube and the inner tube can be integrated with the inner case.

  As described above, according to the present invention, it is possible to perform a combustion test before the burner unit and the heat exchanger unit are incorporated into the outer case, and to easily replace any one of the burner unit and the heat exchanger unit. can do.

FIG. 2 is a schematic diagram schematically illustrating a configuration of a hot water appliance according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view schematically showing a state in which the inner case is fixed to the outer case according to Embodiment 1 of the present invention. FIG. 2 is a perspective view schematically showing a configuration of an inner case according to Embodiment 1 of the present invention. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 2 is an exploded perspective view schematically showing a configuration of a blower unit according to Embodiment 1 of the present invention. FIG. 3 is a perspective view schematically showing a configuration of a support member and a side packing according to the first embodiment of the present invention. FIG. 4 is a perspective view schematically showing a state where the blower unit according to Embodiment 1 of the present invention is attached to an inner case. FIG. 3 is a perspective view schematically showing a state where the burner unit, the primary heat exchanger unit, and the secondary heat exchanger according to Embodiment 1 of the present invention are mounted on an inner case. FIG. 2 is a perspective view schematically showing a state in which the front surface of the inner case according to Embodiment 1 of the present invention is attached. FIG. 2 is a perspective view schematically showing a configuration of an internal unit according to Embodiment 1 of the present invention. FIG. 9 is an exploded perspective view schematically showing a configuration of an internal unit according to Embodiment 2 of the present invention. It is a front view which expands and shows the P section of FIG. FIG. 9 is a perspective view schematically showing a configuration of a support member and a side packing according to a second embodiment of the present invention. FIG. 13 is a rear view schematically showing a state where an outer tube and an inner tube are attached to an inner case according to Embodiment 3 of the present invention. FIG. 14 is a side view schematically showing a state where an outer tube and an inner tube are attached to an inner case according to Embodiment 3 of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the configuration of the hot water appliance according to Embodiment 1 of the present invention will be described.

  Referring to FIG. 1, the hot water equipment of the present embodiment is a hot water equipment capable of recovering heat of combustion gas. In the present embodiment, a hot water device of the present embodiment will be described as an example of a latent heat recovery type hot water device capable of recovering latent heat of combustion gas. In the following, each direction is based on the state where the hot water equipment is installed.

  The hot water equipment in the present embodiment is capable of recovering the heat of the combustion gas. The hot water equipment includes an outer case 1, a burner unit 2, a blower unit 3, a primary heat exchanger unit 4, a secondary heat exchanger 5, a neutralizer 6, a controller 7, a hot water supply path 8, It mainly has an inner case 10.

  In FIG. 2, the neutralizer 6, the controller 7, the hot water supply path 8, and the like are not illustrated for convenience of description. Referring to FIGS. 1 and 2, outer case 1 includes a front surface (front surface) 1 a, a bottom surface (lower surface) 1 b, a top surface (upper surface) 1 c, a pair of side surfaces 1 d, and a rear surface (rear surface) 1 e (see FIG. 2). Have. The direction in which the front surface 1a and the rear surface 1e face each other is the front-back direction of the exterior case 1. The direction in which the bottom surface 1b and the top surface 1c face each other is the vertical direction of the outer case 1. The direction in which the pair of side surfaces 1 d face each other is the width direction of the outer case 1.

  An exhaust hole 1a1 into which an exhaust port EP for exhausting combustion gas is inserted is provided at an upper portion of the front surface 1a of the outer case 1. The exhaust hole 1a1 communicates the inside and outside of the outer case 1. The exhaust hole 1a1 communicates with the exhaust port EP of the inner case 10. At the center of the front surface 1a of the outer case 1, a plurality of intake ports 1a2 for taking air into the housing 1 are provided. The plurality of intake ports 1a2 communicate with the inside and outside of the outer case 1.

  The exterior case 1 has an internal space IS surrounded by a front surface (front surface) 1a, a bottom surface (lower surface) 1b, a top surface (upper surface) 1c, a pair of side surfaces 1d, and a rear surface (rear surface) 1e. In this internal space IS, a burner unit 2, a blower unit 3, a primary heat exchanger unit 4, a secondary heat exchanger 5, a neutralizer 6, a controller 7, a hot water supply path 8, and an internal case 10 are arranged. The inner case 10 is fixed in the outer case 1. The inner case 10 is fixed to the inner surface of the rear surface 1e of the outer case 1 with screws.

  3 and 4, inner case 10 includes a front part (front part) 10a, a bottom part (lower part) 10b, a top part (upper part) 10c, a pair of side parts 10d, and a rear part (back part). ) 10e. The front part 10a has a first through hole H1. The rear surface portion 10e has a second through hole H2. The burner unit 2, a part of the blower unit 3, the primary heat exchanger unit 4, and the secondary heat exchanger 5 are housed in the inner case 10.

  A mounting plate 11 is mounted in the inner case 10. The mounting plate 11 is arranged below the inner case 10. The mounting plate 11 has a hole for guiding air into the burner unit 2. The burner unit 2 is mounted on the mounting plate 11. That is, the burner unit 2 is placed in the inner case 10 without being fixed. Specifically, the burner unit 2 is mounted on the mounting plate 11 without being fixed to the inner case 10 or the mounting plate 11 by screwing or welding.

  The burner unit 2 is for supplying combustion gas. This combustion gas is for performing heat exchange between the primary heat exchanger unit 4 and the secondary heat exchanger 5. The burner unit 2 has a burner case 2a and a plurality of burners 2b.

  The burner case 2a has a hole 2a1 in the bottom plate for taking in air from the blower unit 3 into the inside. The hole 2a1 communicates with a hole of the mounting plate 11. The burner case 2a has a partition member 2a2 for supporting the plurality of burners 2b. Each of the plurality of burners 2b is supported by the partition member 2a2, and is accommodated in the burner case 2a. Each gas inlet of the plurality of burners 2b is connected to an opening 2a3 provided on the wall surface of the burner case 2a.

  A gas supply solenoid valve 13 is provided on a front portion 10 a of the inner case 10. The gas supply solenoid valve 13 is arranged in front of the burner case 2a. The gas supply solenoid valve 13 is for supplying gas from the opening 2a3 to the gas inlets of the plurality of burners 2b.

  Above the plurality of burners 2b, a spark plug 14 and a frame rod 15 are arranged. Each of the spark plug 14 and the frame rod 15 is attached to the front surface 10 a of the inner case 10. The ignition plug 14 is for igniting the burner 2b. Specifically, the spark plug 14 generates a spark in the fuel-air mixture (air-fuel mixture) ejected from the burner 2b by generating an ignition spark with a target provided on the burner 2b. belongs to.

  The flame rod 15 applies a DC voltage between the flames generated by the burner 2b and uses a conductivity and a rectification effect by ionization of the flame to generate a direct current (hereinafter, referred to as a flame current) flowing from the flame rod 15 to the flame. This is for detecting the presence or absence of a flame by detecting.

  Referring to FIGS. 3 to 5, blower unit 3 is for supplying combustion air to burner unit 2. The blower unit 3 is arranged on the bottom surface 10b side (downward) of the burner unit 2. Further, the blower unit 3 is disposed closer to the bottom surface 10b than the primary heat exchanger unit 4 and the secondary heat exchanger 5.

  The blower unit 3 has a blower fan motor 3a and a blower fan 3b. The blower fan motor 3a is for rotating the blower fan 3b. The blower fan 3b is for blowing combustion air. The blower fan motor 3 a is arranged outside the inner case 10. A mounting plate 3c is mounted on the blower fan motor 3a. The blower fan motor 3a is attached to the bottom surface 10b of the inner case 10 by attaching the mounting plate 3c to the outer surface of the bottom surface 10b of the inner case 10 with screws.

  The blower fan motor 3a has a drive shaft 3a1. The drive shaft 3a1 extends in the direction in which the burner unit 2 and the primary heat exchanger unit 4 are stacked. The drive shaft 3a1 is connected to the blower fan 3b via the coupling component 3d. The blower fan 3b has a disk shape, and a drive shaft 3a1 is connected to the center of the disk shape via a coupling part 3d.

  The blower fan 3b is housed in a fan case 3e provided on the bottom surface 10b of the inner case 10. The blower fan 3b is arranged in the inner case 10. The fan case 3e has a wall surrounding the blower fan 3b in a disk-shaped circumferential direction, and an outlet 3e1 is provided in a part of the wall. In the present embodiment, one outlet 3e1 is provided, but a plurality of outlets 3e1 may be provided.

  Referring to FIGS. 1, 3 and 4, each of primary heat exchanger unit 4 and secondary heat exchanger 5 performs heat exchange with the heating gas supplied from burner unit 2. . The primary heat exchanger unit 4 is mounted on the burner unit 2. That is, the primary heat exchanger unit 4 is placed in the inner case 10 without being fixed. Specifically, the primary heat exchanger unit 4 is placed on the burner unit 2 without being fixed to the inner case 10 by screwing or welding. The secondary heat exchanger 5 is arranged on the top surface 10 c side (upper side) of the primary heat exchanger unit 4.

  The primary heat exchanger unit 4 and the secondary heat exchanger 5 are connected by a pipe PP. To the secondary heat exchanger 5, a water supply pipe 8a for supplying water to the secondary heat exchanger 5 is connected. The hot water supply pipe 8b for sending out hot water from the primary heat exchanger unit 4 is connected to the primary heat exchanger unit 4.

  The primary heat exchanger unit 4 is for recovering the sensible heat of the combustion gas supplied from the burner unit 2. The primary heat exchanger unit 4 has a primary heat exchanger heat transfer tube 4a and a primary heat exchanger case 4b that houses the primary heat exchanger heat transfer tube 4a inside. The fluid to be heated flows inside the primary heat exchanger heat transfer tube 4a. The heating gas heated by the burner unit 2 is introduced into the primary heat exchanger case 4b.

  The primary heat exchanger heat transfer tube 4a is connected at one end to a pipe PP and at the other end to a hot water supply pipe 8b. Thereby, hot and cold water is circulated inside the primary heat exchanger heat transfer tube 4a.

  The primary heat exchanger heat transfer tube 4a has a plurality of straight portions (piping in the case) 4a1 having a portion located inside the primary heat exchanger case 4b and a plurality of straight portions (cases) outside the primary heat exchanger case 4b. And a plurality of bent portions (connection pipes) 4a2 connecting the inner pipes 4a1 to each other.

  The plurality of straight portions 4a1 are arranged at an interval from each other. The plurality of bent portions 4a2 connect one end of each of the plurality of straight portions 4a1 and the other end of any of the plurality of straight portions 4a1. The primary heat exchanger heat transfer tube 4a is configured such that a plurality of straight portions 4a1 and a plurality of bent portions 4a2 are connected to one and meander.

  The primary heat exchanger heat transfer tube 4a includes a first protrusion P1 protruding from the primary heat exchanger case 4b toward the front surface 10a, and a second protrusion P2 protruding from the primary heat exchanger case 4b toward the rear surface 10e. Contains. That is, the bent portion 4a2 forms the first protrusion P1 and the second protrusion P2. The first protrusion P1 protrudes from the front surface 10a through the first through hole H1. The second protrusion P2 protrudes from the rear surface 10e through the second through hole H2.

  A front packing 16 is arranged between the front surface 10a and each of the burner case 2a and the primary heat exchanger case 4b. The front packing 16 is configured to fill a gap between the front face 10a and each of the burner case 2a and the primary heat exchanger case 4b.

  The secondary heat exchanger 5 is for recovering the latent heat of the combustion gas supplied from the burner unit 2. The secondary heat exchanger 5 includes a plurality of secondary heat exchanger heat transfer tubes 5a and two header portions 5b provided at one end and the other end of the plurality of secondary heat exchanger heat transfer tubes 5a (see FIG. 8). And The plurality of secondary heat exchanger heat transfer tubes 5a have spirally provided portions. The plurality of secondary heat exchanger heat transfer tubes 5a are stacked on each other. Each of the two header portions 5b is configured to connect one end and the other end of the plurality of secondary heat exchanger heat transfer tubes 5a. The secondary heat exchanger heat transfer tube 5a is connected at one end to a water supply pipe 8a via a header 5b, and at the other end to the pipe PP via a header 5b.

  The support member 12 is disposed above the primary heat exchanger unit 4. The support member 12 is fixed in the inner case 10. The support member 12 supports the secondary heat exchanger 5. The secondary heat exchanger 5 is mounted on the support member 12. That is, the secondary heat exchanger 5 is placed in the inner case 10 without being fixed. Specifically, the secondary heat exchanger 5 is placed on the support member 12 without being fixed to the inner case 10 or the support member 12 by screwing or welding. The secondary heat exchanger 5 is mounted on the support member 12 via a holding member (not shown). The holding member is inserted between the stacked secondary heat exchanger heat transfer tubes 5a and placed on the support member 12 while holding the secondary heat exchanger heat transfer tubes 5a.

  Referring to FIG. 6, support member 12 includes a mounting portion 12 a on which secondary heat exchanger 5 is mounted, and a partition portion 12 b extending from mounting portion 12 a to a side opposite to primary heat exchanger unit 4. Contains. The partition part 12b is arranged at a distance from the rear surface part 10e of the inner case 10. The partition 12b has an opening 12b1. The opening 12b1 is arranged to face the rear surface 10e of the inner case 10. The opening 12b1 is disposed above the mounting portion 12a. Note that side packings 20 are provided on both sides of the support member 12, respectively.

  Referring to FIGS. 3 and 4, as indicated by arrows in the figures, the combustion gas supplied from burner unit 2 and subjected to heat exchange in primary heat exchanger unit 4 is partitioned from rear surface 10 e of inner case 10. It flows from the opening 12b1 to the secondary heat exchanger 5 through the space between the second heat exchanger 5 and the second portion 12b. After passing through the secondary heat exchanger 5, the combustion gas is exhausted from the exhaust port EP to the outside of the inner case 10. Note that, as shown in FIGS. 2 and 3, since the exhaust port EP communicates with the exhaust hole 1 a 1, the combustion gas exhausted to the outside of the inner case 10 is also exhausted from the outer case 1.

  The combustion gas after heat exchange in the primary heat exchanger unit 4 is passed through the secondary heat exchanger 5 to preheat water (fluid to be heated) in the secondary heat exchanger 5. In this process, when the temperature of the combustion gas drops to about 60 ° C., the moisture contained in the combustion gas is condensed, and the latent heat is recovered. Drain is generated by recovering the latent heat of the combustion gas. This drain becomes acidic because nitrogen oxides and the like in the exhaust gas are dissolved therein.

  The mounting portion 12a disposed below the secondary heat exchanger 5 is configured to receive drain generated in the secondary heat exchanger 5. The mounting portion 12a has an outlet 12a1 for discharging drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger. The discharge port 12a1 is connected to the discharge pipe 17. The discharge pipe 17 is connected to the drain pipe 6a shown in FIG.

  Referring to FIG. 1 again, the mounting portion 12a is connected to the neutralizer 6 by the drain pipe 6a. Therefore, the drain is sent from the receiver 12 a to the neutralizer 6 through the drain pipe 6 a.

  The neutralizer 6 neutralizes the drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger 5. The inside of the neutralizer 6 is filled with a neutralizing agent, and the neutralizing agent can neutralize the acidic drain. A drain pipe 6b is connected to the neutralizer 6, and the drain neutralized by the neutralizer 6 is discharged to the outside of the outer case 1 through the drain pipe 6b.

  The controller 7 is for controlling the burner unit 2, the blower unit 3, and the like. The controller 7 is electrically connected to the burner unit 2, the blower unit 3, and the like. The controller 7 has, for example, a microcomputer (not shown).

  The hot water supply path 8 is for supplying hot and cold water that has undergone heat exchange with the combustion gas in the primary heat exchanger unit 4 and the secondary heat exchanger 5 to outside the hot water equipment. Hot water supply path 8 has a water supply pipe 8a, a hot water supply pipe 8b, a water inlet IW, and a water outlet OW. The water supply pipe 8a connects the secondary heat exchanger 5 and the water inlet IW. Hot water supply pipe 8b connects primary heat exchanger unit 4 and tap hole OW.

  Water to be heated is supplied to the secondary heat exchanger 5 from the water inlet IW through the water supply pipe 8a. Water flows from the secondary heat exchanger 5 to the primary heat exchanger unit 4 through the pipe PP. Then, hot water warmed by the primary heat exchanger unit 4 and the secondary heat exchanger 5 is supplied from the primary heat exchanger unit 4 through the hot water supply pipe 8b and the tap hole OW. That is, the water supplied from the water inlet IW through the water supply pipe 8a is heated by the combustion gas when passing through the secondary heat exchanger 5 and the primary heat exchanger unit 4, and is discharged through the hot water supply pipe 8b. Hot water is supplied from OW.

  Subsequently, a method of manufacturing the internal unit will be described with reference to FIGS. Here, as shown in FIG. 3 and FIG. 4, the internal unit houses the burner unit 2, the blower fan 3 b of the blower unit 3, the primary heat exchanger unit 4, and the secondary heat exchanger 5 in the inner case 10. The motor 3a for the blower fan of the blower unit 3 is attached to the outside of the inner case 10. The internal unit is hermetically sealed except for the intake port and exhaust port EP of the blower fan unit. For this reason, the combustion test including the supply and exhaust can be performed by flowing the combustion gas into the internal unit.

  Referring to FIG. 7, a frame having top surface portion 10c of inner case 10, a pair of side surface portions 10d, and rear surface portion 10e is prepared. The mounting plate 11 is fixed to a lower portion inside the frame, and the support member 12 is fixed to the upper portion. For example, the mounting plate 11 and the support member 12 are respectively fixed to the frame by spot welding.

  The blower unit 3 is attached to the bottom surface 10 b of the inner case 10. The blower fan 3b is arranged inside the bottom surface 10b, and the blower motor 3a is arranged outside the bottom surface 10b. The bottom surface 10b to which the blower unit 3 is attached is attached to the inner case component. Thereby, the inner case 10 is formed.

  Referring to FIGS. 8 and 9, burner unit 2, primary heat exchanger unit 4, and secondary heat exchanger 5 are assembled to inner case 10 from the front surface 10 a side. The burner unit 2 is mounted on the mounting plate 11. The burner unit 2 is not fixed to the inner case 10 or the mounting plate 11 by screwing or welding. The primary heat exchanger unit 4 is mounted on the burner unit 2. The primary heat exchanger unit 4 is not fixed to the inner case 10 by screwing or welding. At this time, the bent portion 4a2 on the rear surface 10e side of the primary heat exchanger unit 4 is inserted into the second through hole H2 of the rear surface 10e. The secondary heat exchanger 5 is mounted on the support member 12. Secondary heat exchanger 5 is not fixed to inner case 10 or support member 12 by screwing or welding.

  With the burner unit 2, the primary heat exchanger unit 4, and the secondary heat exchanger 5 assembled in the inner case 1, the front packing 16 is assembled from the front surface 10 a side. The front packing 16 includes a first hole 16a communicating with the exhaust port EP, a second hole 16b communicating with the first through hole H1, a third hole 16c passing the discharge pipe 17, an ignition plug 14 and a frame rod 15. It has a fourth hole 16d through which it passes. The front packing 16 makes the first hole 16a communicate with the exhaust port EP, makes the second hole 16b communicate with the first through hole H1, makes the third hole 16c pass through the discharge pipe 17, and ignites the fourth hole 16d. It is assembled so that the plug 14 and the frame rod 15 pass therethrough.

  Subsequently, referring to FIG. 9 and FIG. 10, front portion 10 a of inner case 10 is attached. The front portion 10a has a first insertion hole 10a1 through which the discharge pipe 17 passes, and a second insertion hole 10a2 through which the ignition plug 14 and the frame rod 15 pass. The bent part 4a2 on the front part 10a side of the primary heat exchanger unit 4 is inserted into the first through hole H1 of the front part 10a. The discharge pipe 17 is inserted into the first insertion hole 10a1. The ignition plug 14 and the frame rod 15 are inserted into the second insertion holes 10a2. With the front part 10a assembled, the front packing 16 is pressed against the burner unit 2 and the primary heat exchanger unit 4 by the front part 10a. Thus, the internal unit is manufactured as shown in FIG.

  In addition, although the case where the secondary heat exchanger 5 is mounted without being fixed in the inner case 10 has been described above, the secondary heat exchanger 5 may be fixed in the inner case 10. . Specifically, the header portion 5b arranged in the inner case 10 and the outer header portion HP fixed to the outside of the inner case 10 shown in FIG. 8 are fixed with screws with a packing interposed therebetween. Is also good. In this case, the secondary heat exchanger 5 is fixed in the inner case 10 by fixing the header part 5b to the outer header part HP.

  As a method of mounting the secondary heat exchanger 5 without fixing it in the inner case 10, the outer header HP is provided in the inner case 10 in a state where the header 5 b and the outer header HP are welded. May be inserted into the insertion slot. In this case, the secondary heat exchanger 5 is placed on the support member 12, and the external header portion HP is inserted into the insertion opening of the inner case 10, so that the secondary heat exchanger 5 is inserted into the inner case 10. It is possible to place without fixing.

Next, the function and effect of the hot water appliance according to Embodiment 1 of the present invention will be described.
According to the hot water equipment of the first embodiment of the present invention, burner unit 2 and primary heat exchanger unit 4 are placed in inner case 10 without being fixed. For this reason, since the burner unit 2 and the primary heat exchanger unit 4 are mounted in the inner case 10, the combustion inspection is performed with the burner unit 2 and the primary heat exchanger unit 4 mounted on the inner case 10. It can be carried out. Therefore, a combustion test can be performed before the burner unit 2 and the primary heat exchanger unit 4 are incorporated into the outer case 1. Further, since the burner unit 2 and the primary heat exchanger unit 4 are not fixed in the inner case 10, any one of the burner unit 2 and the primary heat exchanger unit 4 can be easily replaced. Therefore, for example, when a defect is found in the combustion inspection, either the burner unit 2 or the primary heat exchanger unit 4 can be easily replaced.

  Further, since the burner unit 2 and the primary heat exchanger unit 4 are separately assembled to the inner case 10, the assembly is easy. Further, since the burner unit 2 and the primary heat exchanger unit 4 can be manufactured separately, productivity can be improved.

  Further, in the hot water equipment according to Embodiment 1 of the present invention, first projection P1 is projected from front surface 10a through first through hole H1, and second projection P2 is passed through second through hole H2. By protruding from the rear surface 10e, the size of the inner case 10 can be reduced by the amount of the first protrusion P1 and the second protrusion P2. Further, the first protruding portion P1 protrudes from the front surface portion 10a through the first through hole H1, and the second protruding portion P2 protrudes from the rear surface portion 10e through the second through hole H2. The primary heat exchanger unit 4 can be taken in and out of the inner case 10 in the direction in which the rear face part 10e faces.

  Further, in the hot-water appliance of the first embodiment of the present invention, blower fan motor 3 a is arranged outside inner case 10. Therefore, the blower fan motor 3a can be cooled as compared with the case where it is arranged in the inner case 10. This can prevent the blower fan motor 3a from breaking down due to heat, so that the life of the blower fan motor 3a can be improved.

  Further, in the hot water equipment according to Embodiment 1 of the present invention, drive shaft 3a1 of blower fan motor 3a extends in the direction in which burner unit 2 and primary heat exchanger unit 4 are stacked. For this reason, a drive mechanism such as a rotor and a stator of the blower fan motor 3a can be arranged in a direction intersecting the direction in which the burner unit 2 and the primary heat exchanger unit 4 are stacked. That is, the blower motor 3a can be made horizontal. Thereby, the dimension of the blower fan motor 3a in the direction in which the burner unit 2 and the primary heat exchanger unit 4 are stacked can be reduced. Further, by making the blower fan motor 3a horizontal, it is possible to improve the degree of freedom in the arrangement of the outlet 3e1 of the fan case 3e.

  Further, in the hot water appliance of the first embodiment, secondary heat exchanger 5 is placed in inner case 10 without being fixed. For this reason, a combustion test can be performed in a state where the secondary heat exchanger 5 is mounted on the inner case 10. Therefore, a combustion test can be performed before the secondary heat exchanger 5 is incorporated into the outer case 1. Further, the secondary heat exchanger 5 can be easily replaced. Further, the heat exchange efficiency can be improved.

  Further, in the hot water equipment of the first embodiment, the combustion gas whose sensible heat has been recovered by the primary heat exchanger unit 4 is discharged from the opening 12b1 through the space between the inner case 10 and the partition 12b. It can flow to the heat exchanger 5. Therefore, the function as a collecting cylinder can be added to the support member 12 that supports the secondary heat exchanger 5.

  In the hot water equipment of the first embodiment, the mounting portion 12a has a discharge port 12a1 for discharging drain generated by recovering latent heat of the combustion gas in the secondary heat exchanger 5. For this reason, the drain attached to the mounting portion 12a can be discharged from the discharge port 12a1. Therefore, a function as a drain pan can be added to the mounting portion 12a.

(Embodiment 2)
Second Embodiment A hot water device according to a second embodiment of the present invention will be described with reference to FIGS. Hereinafter, unless otherwise described, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated. This is the same for the following third embodiment.

  As shown in FIGS. 11 and 12, the hot water appliance according to Embodiment 2 of the present invention is implemented in that it has a first secondary heat exchanger 51 and a second secondary heat exchanger 52. It is mainly different from the hot water equipment of mode 1. The first secondary heat exchanger 51 has a secondary heat exchanger heat transfer tube 51a and a header 51b. The second secondary heat exchanger 52 has a secondary heat exchanger heat transfer tube 52a and a header 52b. For example, the first secondary heat exchanger 51 may be used for hot water supply, and the second secondary heat exchanger 52 may be used for heating.

  Referring to FIG. 12 and FIG. 13, the support member 12 has a mounting portion 12a, a partition portion 12b, a partition plate 12c, and a plurality of support plates 12d. The partition plate 12c is fixed on the mounting portion 12a. The space in which the first secondary heat exchanger 51 is arranged and the space in which the second secondary heat exchanger 52 is arranged are partitioned by the partition plate 12c. The plurality of support plates 12d protrude to both sides with the partition plate 12c interposed therebetween. The plurality of support plates 12d each extend in a direction intersecting the partition plate 12c. The plurality of support plates 12d support each of the secondary heat exchanger heat transfer tubes 51a of the first secondary heat exchanger 51 and the secondary heat exchanger heat transfer tubes 52a of the second secondary heat exchanger 52. I have.

  Since the water heater according to Embodiment 2 of the present invention includes the first secondary heat exchanger 51 and the second secondary heat exchanger 52, for example, the combustion gas is used for both hot water supply and heating. And recovers the latent heat of the heat to improve the heat exchange efficiency.

  Note that the hot water equipment of the present embodiment may include a plurality of primary heat exchanger units 4 connected to each of the first secondary heat exchanger 51 and the second secondary heat exchanger 52. .

(Embodiment 3)
Third Embodiment A hot water appliance according to a third embodiment of the present invention will be described with reference to FIGS. The hot water appliance of the third embodiment of the present invention is mainly different from the hot water appliance of the first embodiment in further including a heat exchange unit having an outer pipe 31 and an inner pipe 32. This heat exchanging section is, for example, a bath heater for additionally heating hot water in a bath.

  The outer tube 31 is attached to the outer surface of the inner case 10. In the present embodiment, the outer tube 31 is attached to the outer surface of the rear surface 10e of the inner case 10. The outer tube 31 has an inlet 31a and an outlet 31b. The first fluid flows inside the outer tube 31. The first fluid is, for example, hot water from a bath. In this case, hot water flows from the bath into the inlet 31a of the outer tube 31, passes through the inside of the outer tube 31, and returns to the bath again from the outlet 31b.

  The inner tube 32 is inserted inside the outer tube 31. The inner tube 32 has an inlet 32a and an outlet 32b. A second fluid for heating the first fluid by heat exchange flows inside the inner tube 32. The second fluid is, for example, high-temperature water for heating supplied from a hot-water device. High-temperature water flows from the hot water device into the inlet 32a of the inner tube 32, passes through the inner tube 32, and returns from the outlet 32b to the hot water device again.

  In other words, the heat exchange section having the outer pipe 31 and the inner pipe 32 is a liquid-liquid heat exchanger, and the heat medium is passed through the inner flow path formed by the inner pipe 32, and the outer pipe 31 Water to be heated is passed through the outer channel. Therefore, the bath water as the first fluid flowing through the outer pipe 31 is heated by the high-temperature water as the second fluid flowing through the inner pipe 32. The flow of the fluid in the outer pipe 31 and the flow of the fluid in the inner pipe 32 may be in the same direction, or may be in opposite directions (counter flows). The heat exchange efficiency can be improved by using the counter flow.

  The material of the inner tube 32 may be copper, and the material of the outer tube 31 may be a material such as resin which is less likely to radiate heat than copper.

  In the water heater according to Embodiment 3 of the present invention, outer tube 31 is attached to the outer surface of inner case 10, and inner tube 32 is inserted into outer tube 32. Therefore, the first fluid flowing through the outer pipe 31 can be heated by heat exchange with the second fluid flowing through the inner pipe 32. Further, the outer tube 31 and the inner tube 32 can be integrated with the inner case 10. Thus, the size of the inner case 10 including the outer tube 31 and the inner tube 32 can be reduced.

The above embodiments can be combined as appropriate.
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Reference Signs List 1 outer case, 2 burner unit, 2a burner case, 2b burner, 3 blower unit, 3a blower fan motor, 3a1 drive shaft, 3b blower fan, 4 primary heat exchanger unit, 4a primary heat exchanger heat transfer tube, 4b primary Heat exchanger case, 5 secondary heat exchanger, 5a secondary heat exchanger heat transfer tube, 6 neutralizer, 7 controller, 8 hot water supply path, 8a water supply pipe, 8b hot water supply pipe, 10 internal case, 10a front part, 10a1 1st insertion hole, 10a2 2nd insertion hole, 10b bottom part, 10c top part, 10d side part, 10e rear part, 11 mounting plate, 12 support member, 12a mounting part, 12a1 outlet, 12b1 opening, 12b partition Part, 12c partition plate, 12d support plate, 13 gas supply solenoid valve, 14 spark plug, 15 frame rod, 16 flow Outlet packing, 20 side packing, 31 outer pipe, 32 inner pipe, 51 first secondary heat exchanger, 52 second secondary heat exchanger, EP exhaust port, H1 first through hole, H2 Second through hole, P1 first protrusion, P2 second protrusion.

Claims (8)

A hot water device capable of recovering the heat of the combustion gas,
An outer case,
An inner case fixed inside the outer case,
A burner unit mounted without being fixed in the inner case, and for supplying combustion gas,
A hot water device, comprising: a primary heat exchanger unit that is mounted without being fixed in the inner case and that recovers sensible heat of the combustion gas supplied from the burner unit. The inner case includes a front surface having a first through hole and a rear surface having a second through hole,
The primary heat exchanger unit includes a primary heat exchanger heat transfer tube, and a primary heat exchanger case that houses the primary heat exchanger heat transfer tube,
The primary heat exchanger heat transfer tube includes a first protrusion protruding from the primary heat exchanger case toward the front surface, and a second protrusion protruding from the primary heat exchanger case toward the rear surface. ,
The said 1st protrusion part protrudes from the said front part through the said 1st through-hole, and the said 2nd protrusion part protrudes from the said back surface part through the said 2nd through-hole. Hot water equipment. Further comprising a blower unit for supplying combustion air to the burner unit,
The blower unit includes a blower fan for blowing the combustion air, and a blower fan motor for rotating the blower fan,
3. The hot water device according to claim 1, wherein the blower fan motor is disposed outside the inner case. 4. The blower fan motor includes a drive shaft connected to the blower fan,
The hot water device according to any one of claims 1 to 3, wherein the drive shaft extends in a direction in which the burner unit and the primary heat exchanger unit are stacked.   The secondary heat exchanger according to any one of claims 1 to 4, further comprising a secondary heat exchanger that is mounted without being fixed in the inner case and that recovers latent heat of the combustion gas supplied from the burner unit. The hot water equipment according to 1. Further comprising a support member fixed in the inner case, and supporting the secondary heat exchanger,
The support member includes a mounting portion on which the secondary heat exchanger is mounted, and a partition portion extending from the mounting portion to a side opposite to the primary heat exchanger unit,
The hot water device according to claim 5, wherein the partition portion is arranged at a distance from the inner case and has an opening.   The hot water appliance according to claim 6, wherein the placement section has an outlet for discharging drain generated by recovering latent heat of the combustion gas in the secondary heat exchanger. An outer tube attached to an outer surface of the inner case and through which a first fluid flows;
The warm water according to any one of claims 1 to 7, further comprising: an inner pipe inserted into the outer pipe, and through which a second fluid for heating the first fluid by heat exchange flows. machine.