JP6616105B2 - Heat source machine for hot water supply - Google Patents

Description

  The present invention relates to a hot water supply heat source device including a burner, a combustion housing having a joining flange at one end fastened around a combustion surface of the burner, and a hot water supply heat exchanger disposed in the combustion housing.

  Conventionally, as a heat source device of this type, according to Patent Document 1, an electrode such as an ignition electrode or a frame rod that protrudes into a combustion housing through a through-hole formed in the side plate at a portion near the burner of the side plate on one side of the combustion housing. And an electrode part having an insulator through which an electrode is inserted and fixed are known. Further, in this case, in order to prevent overheating of the side plate of the combustion housing, a plurality of upper and lower water pipes for supplying water to the hot water supply heat exchanger are arranged outside the side plate so as to be in contact with the outer surface of the side plate. The side plate is cooling. And in the thing of patent document 1, although the electrode components are mounted | worn in the arrangement pitch part of the upper and lower water pipes to the side plate of one side, on the outer side of the part spaced apart from the joining flange of the side plate of one side. It is also conceivable to dispose a water pipe and attach an electrode component to the side plate portion between the joint flange and the water pipe.

  By the way, the insulator of the electrode part has a flange portion that overlaps the outer surface of the side plate portion around the through hole through which the electrode formed on one side plate is inserted, and a presser plate that overlaps the outer surface of the flange portion is fastened to the side plate. By doing so, the electrode component is mounted on the side plate. Here, the vertical width of the pressing plate needs to be relatively large in order to press the flange portion over the entire surface. And when the water pipe is arranged outside the side plate, to attach the electrode parts to the side plate part between the joining flange and the water pipe, the distance between the cross-sectional part closest to the joining flange of the water pipe and the joining flange must be suppressed. It is necessary to make the presser plate more than the vertical width of the plate so that the presser plate does not interfere with the water pipe. Thus, since the distance between the water pipe and the joining flange is increased, the side plate portion between the joining flange and the water pipe is not sufficiently cooled, and the side plate portion and the insulator are likely to be overheated.

European Patent Application Publication No. 2811141

  In view of the above, the present invention provides a hot water supply heat source device that can prevent overheating of a portion between a joint flange and a water pipe, which is a portion to which an electrode part of a side plate on one side of a combustion housing is mounted, and an insulator. The issue is to provide.

In order to solve the above-described problems, the present invention includes a burner, a combustion housing having a joining flange at one end fastened around the combustion surface of the burner, and a heat exchanger for hot water supply disposed in the combustion housing. An electrode component that is a heat source device for hot water supply, and includes an electrode that protrudes into the combustion housing through a through hole formed in the side plate, and an insulator through which the electrode is inserted and fixed at a portion near the burner of the side plate on one side of the combustion housing The insulator has a flange portion that overlaps the outer surface of the portion around the through hole of the side plate on one side, and the electrode component is attached to the side plate by fastening the presser plate that overlaps the outer surface of this flange portion to the side plate. The water pipe for supplying water to the heat exchanger is arranged in contact with the side plate on one side, inside the portion spaced from the joint flange of the side plate on one side by a predetermined distance, and between the joint flange and the water tube. Side plate part of the joint flange Is formed along the tangent to the outer portion of the Activity water pipe, the electrode parts to the side plates portion, characterized in that it is fitted.

  According to the present invention, the distance between the contact point of the tangent line along the side plate portion between the joint flange and the water pipe to the water pipe and the joint flange is greater than the distance between the cross section portion closest to the joint flange of the water pipe and the joint flange. Is also increased by the radius of the water pipe. Therefore, even if the distance between the cross-section portion closest to the joint flange of the water pipe and the joint flange is smaller than the vertical width of the presser plate, the distance between the contact and the joint flange is not less than the vertical width of the presser plate. For example, the electrode component can be mounted on the side plate portion between the joining flange and the water pipe. As a result, the distance between the water pipe and the joining flange can be shortened, and the side plate portion and the insulator between the joining flange and the water pipe can be effectively prevented from being overheated.

  In the present invention, it is desirable that the side plate portion between the joining flange and the water pipe is inclined outward with respect to the vertical direction which is the height direction of the combustion housing. According to this, the side plate portion and the insulator between the joint flange and the water pipe are separated from the combustion surface of the burner, and the amount of heat input from the burner to the side plate portion and the insulator is reduced. Can be more effectively prevented.

The perspective view which shows the heat source machine for hot water supply of embodiment of this invention. Sectional drawing cut | disconnected by the II-II line | wire of FIG. Sectional drawing cut | disconnected by the III-III line | wire of FIG. The perspective view of the decomposition | disassembly state of the principal part of the heat-source equipment for hot water supply of embodiment.

  1 and 2, a hot water supply heat source apparatus according to an embodiment of the present invention includes a burner 1 having a downward posture with a combustion surface 1a facing downward, and a joining flange at an upper end fastened around the combustion surface 1a. And a heat exchanger 3 for hot water supply disposed in the combustion housing 2. A latent heat recovery type sub heat exchanger (not shown) is disposed below the combustion housing 2.

  The burner 1 includes a burner body 11 having a lower surface as an open surface, and a combustion plate 12 constituting a combustion surface 1a attached to the lower surface of the burner body 11. The burner body 11 is provided with an inflow port 11a to which an air-fuel mixture supply duct (not shown) is connected. In addition, a large number of flame holes 12a are formed in the combustion plate 12, and the air-fuel mixture flowing into the burner body 11 from the inflow port 11a is ejected from these flame holes 12a and undergoes primary combustion.

  The heat exchanger 3 is configured by a fin tube type heat exchanger including a large number of fins 31 and a plurality of heat absorption tubes 32 penetrating the fins 31. On the outer surface of the side plate 22 on both sides in the lateral direction of the combustion housing 2, a plurality of connection lids 33 are attached to define a connection path between two adjacent heat absorption tubes 32, 32 between the side plate 22, The heat absorption pipe 32 is connected in series. A hot water outlet 34 is provided in the connection lid 33 that defines a connection path connected to the heat absorption pipe 32 at the downstream end between the side plate 22 and the connection lid 33.

  In order to prevent the side plates 23 and 24 from being overheated inside the portions above the heat exchanger 3 of the front side plate 23 and the rear side plate 24 of the combustion housing 2, respectively, two upper and lower water tubes 4 and 4. Are arranged in contact with the side plates 23 and 24. Further, on the outer surface of the side plate 22 on one side in the horizontal direction of the combustion housing 2, an inflow side header lid 41 that defines a connection path between the upper and lower water pipes 4, 4 between the side plate 22, and a front side An outflow header lid 42 is attached between the upper and lower water pipes 4, 4 and the end plate 32 at the upstream end of the heat exchanger 3. A water port 43 is provided. Further, on the outer surface of the side plate 22 on the opposite side of the combustion housing 2, as shown in FIG. 3, a connection lid that defines a connection path between the rear water tube 4 and the front water tube 4 between the side plate 22. 44 is attached. Then, the water that has passed through the auxiliary heat exchanger passes through the inlet 43, the connection path in the inflow header lid 41, the rear water pipe 4, the connection path in the connection lid 44, the front water pipe 4, and the outflow header lid 42. The hot water supplied to the heat exchanger 3 via the connection path and heated by the heat exchanger 3 is discharged from the hot water outlet 34.

  Referring also to FIG. 4, the side plate portion 23 a between the joining flange 21 and the upper water pipe 4, which is a portion near the burner 1 of the front side plate 23 of the combustion housing 2, has a through hole 23 b formed therein. An electrode component 5 is mounted that includes an electrode composed of an ignition electrode 51, a ground electrode 52, and a frame rod 53 projecting into the combustion housing 2 through and an insulator 54 through which these electrodes 51, 52, 53 are inserted and fixed. The insulator 54 has a flange portion 54 a that overlaps with an outer surface of a portion around the through hole 23 b of the side plate 23 via a packing 55. A presser plate 56 that overlaps the outer surface of the flange portion 54 a is provided, and the electrode plate 5 is attached to the side plate 23 by fastening the presser plate 56 to the side plate 23. In addition, the holding plate 56 has an extending portion 56a that projects from the portion overlapping the lever 54 to one side in the lateral direction, and the extending portion 56a has a through-hole different from the through-hole 23b formed in the side plate 23. A viewing window 56b for viewing the inside of the combustion housing 2 through the hole 23c is provided.

  By the way, the vertical width of the packing 55, the flange portion 54a, and the pressing plate 56 needs to be larger than the vertical width of the through hole 23b. In particular, in the present embodiment, since the holding plate 56 has the extending portion 56a in which the observation window 56b is provided, the vertical width from the upper edge of the holding plate 56 to the lower edge of the extending portion 56a becomes considerably large. When the front side plate 23 is formed so as to be in contact with the outer half of the upper water pipe 4 like the rear side plate 24, the side plate 23 between the joint flange 21 and the upper water pipe 4 is formed. In order to attach the electrode component 5 to a portion, the uppermost portion, which is a cross-sectional portion closest to the joining flange 21 of the water pipe 4, and the joining flange 21, so as to ensure a plane having a vertical width equal to at least the holding plate 56 in the portion. It is necessary to make the distance between the upper and lower widths of the holding plate 56 greater than or equal to each other. Thus, when the distance between the water pipe 4 and the joining flange 21 is increased, the cooling of the portion of the side plate 23 between the joining flange 21 and the water pipe 4 is insufficient, and the side plate portion and the insulator 54 are likely to be overheated. turn into.

  Therefore, in the present embodiment, the side plate portion 23a between the joint flange 21 of the front side plate 23 and the upper water pipe 4 is formed so as to extend along the tangent line extending from the joint flange 21 and in contact with the outer portion of the water pipe 4. The electrode component 5 is mounted on the side plate portion 23a.

  According to this, the cross-section part (water pipe 4) in which the distance between the contact point of the tangent along the side plate part 23a between the joint flange 21 and the water pipe 4 and the joint flange 21 is the closest to the joint flange 21 of the water pipe 4. The distance between the uppermost part of the water pipe 4 and the joining flange 21 is substantially larger by the radius of the water pipe 4. Even if the distance between the uppermost portion of the water pipe 4 and the joining flange portion 21 is smaller than the vertical width of the presser plate 56, the distance between the contact point and the joint flange 21 is not less than the vertical width of the presser plate 56. For example, the electrode component 5 can be mounted on the side plate portion 23 a between the joining flange 21 and the water pipe 4. As a result, the distance between the water pipe 4 and the joining flange 21 is shortened, and overheating of the side plate portion 23a and the insulator 54 between the joining flange 21 and the water pipe 4 is effectively prevented by the cooling action of the water pipe 4. Can do.

  Further, in the present embodiment, the arrangement position of the water pipe 4 on the front side is shifted from the position directly below the joining flange 21 to the outside (front), and the side plate portion 23 a between the joining flange 21 and the water pipe 4 is moved in the height direction of the combustion housing 3. It is inclined outward with respect to the vertical direction. According to this, the side plate part 23a and the insulator 54 between the joining flange 21 and the water pipe 4 are separated from the combustion surface 1a of the burner 1 as compared with the case where the side plate part 23a is not inclined. As a result, the amount of heat input from the burner 1 to the side plate portion 23a and the insulator 54 is reduced, and overheating of the side plate portion 23a and the insulator 54 can be more effectively prevented.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the burner 1 is disposed in a downward posture, but the burner is disposed in an upward posture in which the combustion surface faces upward, and the joining flange at the lower end of the combustion housing is fastened around the combustion surface of the burner. The present invention can be similarly applied to the hot water supply apparatus.

  DESCRIPTION OF SYMBOLS 1 ... Burner, 1a ... Combustion surface, 2 ... Combustion casing, 21 ... Joint flange, 23 ... Front side plate (one side plate), 23a ... Side plate part between joint flange and water pipe, 23b ... Through-hole, 3 ... heat exchanger, 4 ... water pipe, 5 ... electrode component, 51 ... ignition electrode (electrode), 52 ... ground electrode (electrode), 53 ... frame rod (electrode), 54 ... insulator, 54a ... flange, 56 ... presser Board.

Claims (2)

A hot water supply heat source device comprising a burner, a combustion housing having a joining flange at one end fastened around the combustion surface of the burner, and a heat exchanger for hot water supply disposed in the combustion housing. An electrode component including an electrode protruding into the combustion housing through a through hole formed in the side plate and an insulator through which the electrode is inserted and fixed is attached to a portion of the side plate closer to the burner. In what has the flange part that overlaps the outer surface of the part around the through hole, and the electrode part is attached to the side plate by fastening the presser plate that overlaps the outer surface of this flange part to the side plate,
A water pipe for supplying water to the heat exchanger is arranged in contact with the side plate on one side inside a portion spaced from the joint flange of the one side plate by a predetermined distance, and the side plate portion between the joint flange and the water tube is A hot water supply heat source apparatus, characterized in that it is formed along a tangent line extending from a joint flange and in contact with an outer portion of a water pipe, and an electrode part is mounted on the side plate portion.   The hot water supply heat source apparatus according to claim 1, wherein the side plate portion between the joining flange and the water pipe is inclined outward with respect to a vertical direction which is a height direction of the combustion housing.

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