JP4171430B2 - Exhaust hood - Google Patents

Description

  The present invention relates to an exhaust hood that is disposed above an exhaust port of a combustor such as a water heater to direct the flow of combustion exhaust rising from the exhaust port to the front, and more specifically, a plurality of longitudinally extending pieces in the lateral direction. And a pair of connecting pieces that connect the louvers to each other at both lateral ends of the louvers so that the louvers are arranged in the forward and backward direction with an interval in the front-rear direction. About.

  Conventionally, this type of exhaust hood has a single plate structure in which a plurality of louvers and a pair of connecting pieces are cut and raised from a single metal plate in order to reduce the number of parts and reduce costs. It is known (see, for example, Patent Document 1).

When manufacturing this exhaust hood, as shown in FIG. 5 (a), the lateral direction that defines the portion that becomes the louver 61, leaving margins on both sides in the lateral direction that become the connecting pieces 62 on one metal plate 100. A plurality of longitudinal longitudinal cuts 101 are inserted into the longitudinal cuts 102, and longitudinal cuts 102 extending in the longitudinal direction are inserted at the ends of the lateral cuts 101 so that each louver 61 is connected to the connecting piece 62 at an intermediate portion of the longitudinal width. Then, as shown in FIG. 5 (b), each connecting piece 62 is bent in a substantially sawtooth shape in accordance with the arrangement pitch of the louvers 61 so that the connecting portion 62a with each louver 61 is inclined upward. Each louver 61 is brought into a forward inclined posture by the inclination of the connecting portion 62a with each louver 61, and each connecting piece is fixed to an exhaust hood fixing member (not shown) provided on both lateral sides of the exhaust port of the combustor. 62 is seated at a tooth root portion 62 b located between the connecting portions 62 a with each louver 61. An attachment hole 62c for fixing the exhaust hood 6 to the fixing member is formed in the tooth root portion 62b of the connecting piece 62 located between the foremost louver 61 and the subsequent louver 61.
Japanese Patent No. 2555271

  In the conventional exhaust hood, the front end portion of the connecting piece terminates at a connecting portion with the foremost louver, and the connecting portion is supported in a cantilevered state with respect to the fixing member. Therefore, when the user cleans the exhaust hood, if external force is applied to the foremost louver, the connecting part of the connecting piece with the foremost louver is easily deformed, and the foremost louver falls down to the front side. , Combustion exhaust flow may deteriorate.

  In view of the above points, an object of the present invention is to provide an exhaust hood having a single plate structure that can suppress the collapse of the foremost louver.

In order to solve the above problems, in the present invention, a plurality of laterally elongated louvers disposed to direct the flow of combustion exhaust rising from the exhaust port forward above the exhaust port of the combustor, An exhaust hood composed of a pair of connecting pieces that connect the louvers to each other at both lateral ends of the louvers so that the louvers are arranged in a forward and backward direction with an interval in the front-rear direction, A single metal plate is provided with a plurality of longitudinal longitudinal incisions in the lateral direction to define a louver portion, leaving margins on both sides in the lateral direction as connecting pieces, and each louver at the end of each lateral incision. Insert a longitudinal cut extending in the front-rear direction so that it is connected to the connecting piece at the middle part of the front-rear width, and approximately serrated to match the connecting pitch of each louver so that the connecting part with each louver is inclined forward Bend to each louver of each connecting piece Each louver is inclined forward by the inclination of the gap portion, and each connecting piece is located on the fixing member for the exhaust hood provided on both sides in the lateral direction of the exhaust port of the combustor. At the front end of the connecting portion with the foremost louver of each connecting piece, leg pieces that are bent downward and contact the fixing member for the exhaust hood are extended, and these leg pieces are made of metal. It is provided only on both lateral sides of the plate .

  According to said structure, the connection part with the foremost louver of a connection piece is supported by a leg piece part, and this connection part does not deform | transform easily. This effectively prevents the frontmost louver from falling down. Therefore, it is possible to prevent the combustion exhaust flow from deteriorating due to the fall of the louver and adversely affecting the combustibility.

  When the lower end of the leg piece part is in line contact with the fixing member, the lower end of the leg piece part is liable to be displaced in the front-rear direction with respect to the fixing member, and the resistance force against the collapse of the foremost louver is weakened. On the other hand, if the foot portion that makes surface contact with the fixing member is bent at the lower end of the leg piece portion, the lower end of the leg piece portion is less likely to be displaced in the front-rear direction with respect to the fixing member. Increases resistance to falling. In addition, if a locking portion for locking the leg piece portion at least in the front-rear direction with respect to the fixing member is formed at the lower end of the leg piece portion, resistance to the collapse of the frontmost louver is further increased.

  With reference to FIG. 1, reference numeral 1 denotes a main body of a water heater as a combustor, and a heat exchanger 2 is provided in the water heater main body 1. Referring also to FIG. 2, the heat exchanger 2 includes a can body 3 that opens up and down, and a heat absorbing body 4 that is mounted on the top of the can body 3. A burner (not shown) is inserted into the lower end opening of the can 3, and heat exchange with the heat absorber 4 is performed by combustion exhaust of the burner. The heat absorber 4 includes a pair of left and right cover plates 41, a plurality of fins 42 arranged with a space between the cover plates 41, and a meandering heat absorption tube 43 penetrating the cover plates 41 and the fins 42. It consists of Further, on the left and right side surfaces of the upper portion of the can body 3, recessed portions 3 a are formed in accordance with the front and rear widths of the meandering endothermic tube 43. The endothermic body 4 is sandwiched between the front and rear surfaces of the upper portion of the inner body 2 of the heat sink 4, and the endothermic tube 43 portion between the fin 42 and the cover plate 41 is fitted into the recess 3a. It attaches to the upper part of the can 3 so that the notch 3a is covered with the cover plate 41 from the outside. When water is passed through the heat absorption pipe 43, the burner is ignited, the heat of the combustion exhaust of the burner is absorbed by the heat absorption body 4, and the water flowing through the heat absorption pipe 43 is heated.

  In order to prevent the combustion exhaust from rising from the exhaust port 5 as it is above the exhaust port 5 formed by the upper end opening of the can 3, the heating of the hanging cupboard and the like disposed above the water heater is prevented. An exhaust hood 6 is disposed to direct the flow of combustion exhaust rising from the exhaust port 5 forward. The exhaust hood 6 has a plurality of louvers 61 that are long in the lateral direction (five in the illustrated example), and the louvers 61 are arranged in a forward-tilting posture with a gap in the front-rear direction. And a pair of connecting pieces 62 for connecting the louvers 61 to each other at both ends in the lateral direction.

  The exhaust hood 6 has a single plate structure, and a louver 61 and a connecting piece 62 are formed by cutting and raising from one metal plate 100 shown in FIG. The metal plate 100 is formed with a plurality of longitudinal incisions 101 (four in the illustrated example) in the lateral direction, leaving the margin portions to be the connecting pieces 62 on both sides in the lateral direction, and the foremost lateral incision. The portion between 101 and the front edge of the metal plate 100 is the foremost # 1 louver 61, and the portion between the rearmost side cut 101 and the rear edge of the metal plate 100 is the last # 5 louver 61. The portion between the horizontal cuts 101 becomes the remaining louvers 61 of # 2, # 3, and # 4. At the end of each horizontal cut 101, a vertical cut 102 extending in the front-rear direction is formed so that each louver 61 is connected to the connecting piece 62 at the middle part of the front-rear width. Then, each connecting piece 62 is bent in a substantially serrated shape according to the arrangement pitch of the louvers 61 so that the connecting portion 62a with each louver 61 inclines forwardly, and the connecting portion with each louver 61 of each connecting piece 62 Each louver 61 is in a forward inclined posture by the inclination of 62a. In addition, a folded portion 61a for reinforcement is formed at the front edge of the # 1 louver 61, and a bead 63 for reinforcement is formed from each connecting portion 62a to each louver 61. Further, the metal plate 100 is provided with a tongue-like portion extending forward from the connecting portion 62a of each connecting piece 62 with the # 1 louver 61, and this portion becomes a leg piece portion 64 described later. Further, in this embodiment, the horizontal cuts 101 and the vertical cuts 102 are formed in the shape of long holes having a certain width. However, the cuts 101 and 102 are formed in a linear shape having a substantially zero width. Is also possible.

  On the upper edge of each cover plate 41 of the endothermic body 4, a rising portion 41a that once bends outward in the lateral direction is extended, and the exhaust hood 6 is formed by an outer bent flange on the upper edge of the rising portion 41a. A fixing member 7 is configured. Then, each connecting piece 62 of the exhaust hood 6 is seated on the fixing member 7 at a tooth root portion 62 b located between the connecting portions 62 a with each louver 61. Further, a mounting hole 62c is formed in the root portion 62b adjacent to the connecting portion 62a with the # 1 louver 61, and the exhaust hood 6 is screwed to the fixing member 7 in the mounting hole 62c.

  The rear portion of each lid plate 41 projects rearward from the can 3, and a claw portion 41 b that bends inward in the lateral direction is formed on the upper edge of the projecting portion. Then, the rear portion of the # 5 louver 61 is suspended so as to reach the upper end of the rear surface of the can body 3, and a hook portion 61b that is bent obliquely rearward is formed at the lower edge thereof. The hook portion 61b is connected to the claw portion 41b. Hang on. Further, a window hole is opened in the rising portion 41a. Therefore, air is mixed into the combustion exhaust rising from the exhaust port 5 through the window hole, and the exhaust temperature is lowered.

Here, in the conventional exhaust hood shown in FIG. 5, the front end portion of the connecting piece 62 terminates at the connecting portion 62a with the foremost louver 61, but in the exhaust hood 6 of the present embodiment, the foremost # A leg piece portion 64 that is bent downward and comes into contact with the fixing member 7 is extended at the front end of the connecting portion 62 a with the first louver 61. In addition, the leg piece part 64 is provided only in the horizontal direction both sides of the metal plate 100, as shown in FIG. Further, a foot portion 64 a bent in front and in surface contact with the fixing member 7 is formed at the lower end of the leg piece portion 64. According to this, the leg piece part 64 becomes a support of the connection part 62a with the louver 61 of # 1, and the bending rigidity of this connection part 62a becomes high. Therefore, when the exhaust hood 6 is cleaned, when an external force is applied to the # 1 louver 61, it is possible to effectively prevent the # 1 louver 61 from falling forward due to the deformation of the connecting portion 62a. Therefore, it is possible to prevent the combustion flow from deteriorating due to the fall of the louver 61 and adversely affecting the combustibility.

  When the lower end of the leg piece 64 is in line contact with the fixing member 7, the lower end of the leg piece 64 is easily displaced in the front-rear direction with respect to the fixing member 7, and is resistant to the fall of the # 1 louver 61. Becomes weaker. On the other hand, if the foot portion 64a is bent at the lower end of the leg piece portion 64 as in the present embodiment, the lower end of the leg piece portion 64 is less likely to be displaced in the front-rear direction with respect to the fixing member 7, and # 1 The resistance to the falling of the louver 61 becomes stronger.

  Further, as in the second embodiment shown in FIG. 4, a slit 7 a is formed in the fixing member 7 at a position where the leg piece 64 abuts, and the slit 7 a is inserted into the lower end of the leg piece 64. You may project the nail | claw part 64b. According to this, the leg piece portion 64 is fixedly locked in the front-rear direction with respect to the fixing member 7, and the resistance force against the falling of the louver 61 of # 1 is further increased.

  Moreover, in the thing of 2nd Embodiment, the part of the nail | claw part 64b which protrudes below the slit 7a may be crimped, and the leg piece part 64 may be fixed to the fixing member 7. FIG. According to this, it is possible to prevent the leg piece portion 64 from being lifted from the fixing member 7 due to thermal distortion of the exhaust hood 6 or the like.

  In the second embodiment, the claw portion 64b is formed at the lower end of the leg piece portion 64 as a locking portion that locks the leg piece portion 64 at least in the front-rear direction with respect to the fixing member 7. It is also possible to form a mounting hole in the foot portion 64a as in the first embodiment shown in FIG. 2 and screw the foot portion 64a to the fixing member 7. In this case, the locking portion is constituted by the foot portion 64a.

  As mentioned above, although embodiment which applied this invention to the exhaust hood 6 of a water heater was described, this invention is applicable similarly to the exhaust hood of combustors other than a water heater.

The longitudinal cross-sectional view of the principal part of the water heater which comprises the exhaust hood of 1st Embodiment of this invention. The perspective view of the state which attached the exhaust hood of the heat exchanger of the water heater of FIG. The top view of the metal plate which forms the exhaust hood of 1st Embodiment. The perspective view of the leg piece part of the exhaust hood of 2nd Embodiment. (a) The top view of the metal plate which forms the conventional exhaust hood, (b) The perspective view of the conventional exhaust hood.

Explanation of symbols

  5 ... exhaust port, 6 ... exhaust hood, 61 ... louver, 62 ... connecting piece, 62a ... connecting part, 62b ... tooth root part, 64 ... leg piece part, 64a ... foot part, 64b ... claw part (locking part) 7 ... fixing member, 100 ... metal plate, 101 ... transverse cut, 102 ... longitudinal cut.

Claims (3)

Above the combustor exhaust port, a plurality of laterally extending louvers are arranged to direct the flow of combustion exhaust rising from the exhaust port forward, and the louvers are forwardly inclined and spaced apart in the front-rear direction. An exhaust hood composed of a pair of connecting pieces that connect the louvers to each other at both lateral ends of the louvers,
A single metal plate is provided with a plurality of longitudinal longitudinal incisions in the lateral direction to define a louver portion, leaving margins on both sides in the lateral direction as connecting pieces, and each louver at the end of each lateral incision. Insert a longitudinal cut extending in the front-rear direction so that it is connected to the connecting piece at the middle part of the front-rear width, and approximately serrated to match the connecting pitch of each louver so that the connecting part with each louver is inclined forward Each louver is bent forward by tilting the connecting portion of each connecting piece with each louver, and each connecting piece is attached to the fixing member for the exhaust hood provided on both lateral sides of the exhaust port of the combustor. In what is seated in the tooth root located between the connecting part with the louver,
The front end of the connecting portion of the louver the foremost position of the connecting members, and bent downward to extend the leg portion in contact with the fixing member for the exhaust hood, these leg portions only laterally opposite the metal plate water heater exhaust hood, wherein Rukoto provided.   The exhaust hood for a water heater according to claim 1, wherein a foot portion in surface contact with the fixing member is bent at a lower end of the leg piece portion.   The exhaust hood for a water heater according to claim 1, wherein a locking portion for locking the leg piece portion at least in the front-rear direction to the fixing member is formed at a lower end of the leg piece portion.

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