Heat source machine

Abstract

To provide a heat source machine including: a combustion casing in which a burner is attached at a front end in a housing and a heat exchanger is provided therein; and a hook 17 with a fixed hooking part engaging with the combustion casing provided on a back panel 16 of the housing, in which a strength of the hook is improved and a cost increase can be suppressed.SOLUTION: A hook 17 includes: a metal-plate first hook member 171 having a first base part 171a fixed to a front surface of a back panel 16 of a housing and a first support panel part 171b extending frontward which is curved at one end part of the first base part in a horizontal direction; and a metal-plate second hook member 172 having a second base part 172a adjacent to and fixed to the first base part 171a in one horizontal direction on a front surface of the back panel 16 of the housing and a second support panel part 172b extending frontward which is curved at the other end part of the second base part in the horizontal direction. Both of the first and second support panel parts 171b, 172b are overlapped in the horizontal direction, and the hooking part engages with the upper edge of both of the support panel parts.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a heat source machine in which a combustion case having a built-in heat exchanger with a burner attached to an end thereof is accommodated within a housing. [Background technology]

[0002] Conventionally, as this type of heat source machine, one in which a hook portion is provided on the back plate of the housing to engage with a fixed hook portion on the combustion casing is known (for example, see Patent Document 1). Here, the combustion casing is fastened and fixed to the back plate, but if a hook is provided, the hook can be used to hold the combustion casing so that it does not fall when the fastening of the combustion casing to the back plate is released during maintenance.

[0003] The hooks in the above-mentioned conventional example are formed integrally with the back plate by cutting and raising a portion of the back plate. However, such hooks may be deformed if the weight of the combustion housing including the burner and heat exchanger increases. To prevent the hooks from deforming, it is possible to increase the thickness of the hooks, i.e., the thickness of the back plate on which the hooks are integrally formed, but this would increase costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-89774 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, an object of the present invention is to provide a heat source machine in which the strength of the hooks is improved and an increase in costs is suppressed. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a heat source machine in which a combustion case with a built-in heat exchanger and a burner attached to one end is stored within the housing, and a hook is provided on the back plate of the housing with a hook portion fixed to the combustion case that engages with the hook, wherein the hook is composed of a first hook member made of sheet metal having a first base portion fixed to the front surface of the back plate of the housing and a first support plate portion bent forward at one lateral end of the first base, and a second hook member made of sheet metal having a second base portion fixed to the front surface of the back plate of the housing adjacent to one lateral end of the first base, and a second support plate portion bent forward at the other lateral end of the second base, and the first and second support plate portions are overlapped horizontally, and the hook portion engages with the upper edges of both support plate portions.

[0007] According to the present invention, the hook is constructed by stacking two hook members, the first and the second, which improves the strength of the hook and allows it to support even a heavy combustion enclosure without any problems. Furthermore, there is no need to make the back plate of the housing thick, which helps prevent costs from increasing. While it is possible to construct the hook using a single thick hook member, the cost of such a hook member would be significantly higher. In contrast, in the present invention, the thickness of each of the first and the second hook members can be thin, and even when two hook members are used, the cost is lower than when using a single hook member, further reducing costs.

[0008] Furthermore, in the present invention, it is desirable that one of the first support plate portion and the second support plate portion has a male engaging portion for positioning that protrudes laterally toward the other of the first support plate portion and the second support plate portion, and that the other of the first support plate portion and the second support plate portion has a female engaging portion for positioning with which the male engaging portion engages. By engaging the male engaging portion with the female engaging portion, the first and second hook members can be combined in a positioned state and handled as a single component, improving assembly workability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a heat source machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the heat source device according to the embodiment, with a portion of the front panel removed. [Figure 3] Cross-sectional view taken along line III-III in Figure 2. [Figure 4] FIG. 2 is an enlarged perspective view of a main part of the heat source machine according to the embodiment. [Figure 5] FIG. 2A is a perspective view of a hook of the heat source device according to the embodiment, and FIG. 2B is a perspective view of the hook in an exploded state. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1 to 3, a heat source apparatus according to an embodiment of the present invention includes a housing 1 having a removable front panel 11. The housing 1 contains a combustion cabinet 4 having a heat exchanger 3 built in and a burner 2 attached to its front end. The housing 1 also contains a fan 5 connected to a gas inlet pipe 21 extending downward from the burner 2. A premixing section 6 is connected upstream of the fan 5. The premixing section 6 is provided with a fuel gas valve unit 61 attached to a gas suction section (not shown) provided therein. By driving the fan 5, primary air is drawn into the premixing section 6, and fuel gas from a gas pipe 62 is mixed into the primary air via the valve unit 61 and the gas suction section, and the mixture of the fuel gas and primary air is supplied to the burner 2 via the fan 5 and the gas inlet pipe 21.

[0011] The top surface of housing 1 is provided with a cylindrical exhaust connection port 12 to which an exhaust pipe (not shown) extending outdoors can be connected, a cylindrical first air intake connection port 13 surrounding exhaust connection port 12 to which a double-pipe air intake pipe (not shown) with the exhaust pipe housed inside can be connected, and a second air intake connection port 14 to which a non-double-pipe air intake pipe (not shown) can be connected. Cover members 131, 141 that close the first and second air intake connection ports 13, 14 are attached. When a double-pipe air intake pipe is used, the air intake pipe is connected to first air intake connection port 13 with cover member 131 removed, and when a non-double-pipe air intake pipe is used, the air intake pipe is connected to second air intake connection port 14 with cover member 141 removed.

[0012] An air supply box 15 is provided at the upper end of the housing 1, and communicates with both the first and second air supply connection ports 13, 14. An outlet port fitted with a filter (not shown) is opened on one horizontal side of the bottom surface of the air supply box 15. An air supply tube 63 connected to the upstream side of the premixing section 6 is also arranged at the bottom of the housing 1. When the fan 5 is driven, air from the air supply pipe flows through the air supply box 15 and the outlet port into the housing 1, and is sucked into the premixing section 6 from the suction port 63a at the upstream end of the air supply tube 63 as primary air.

[0013] The burner 2 has a burner body 22 to which the air-fuel mixture is supplied from the gas inlet pipe section 21, and a combustion plate 23 that covers the rear-facing open surface of the burner body 22. The air-fuel mixture ejected from the combustion plate 23 undergoes total primary combustion (secondary air combustion) within the combustion housing 4. The combustion housing 4 is cylindrical and extends in the front-to-rear direction. The heat exchanger 3 is composed of a heat exchange section 32 formed by spirally winding a single heat absorption pipe 31 that extends in the front-to-rear direction, and a shielding plate 33 located inside the heat exchange section 32 near its rear end. A water supply pipe 34 is connected to the upstream end of the heat absorption pipe 31 located at the rear end of the heat exchange section 32, and a hot water outlet pipe 35 is connected to the downstream end of the heat absorption pipe 31 located at the front end of the heat exchange section 32. In the portion forward of the shielding plate 33, the combustion gas generated by the combustion of the air-fuel mixture flows from the inside of the heat exchange section 32 to the outside of the heat exchange section 32 through the gaps between the winding pitches of the heat absorption pipe 31, and the water in the heat absorption pipe 31 is heated by sensible heat, while in the portion rearward of the heat shielding plate 33, the combustion gas flows from the outside of the heat exchange section 32 to the inside of the heat exchange section 32 through the gaps between the winding pitches of the heat absorption pipe 31, and the water in the heat absorption pipe 31 is heated by latent heat.

[0014] An upwardly bulging exhaust hood 41 is provided at the rear of the upper surface of the combustion housing 4, and communicates with the gap between the rear end of the heat exchanger 32 and the rear end plate of the combustion housing 4. The exhaust hood 41 is connected to the exhaust connection port 12 via an exhaust adapter 121. Combustion gas that flows from the outside to the inside of the heat exchanger 32 in the area rearward of the heat shield plate 33 is discharged into the exhaust pipe through the gap between the rear end of the heat exchanger 32 and the rear end plate of the combustion housing 4, via the exhaust hood 41 and the exhaust connection port 12. In addition, a drain pipe 42 is connected to the underside of the combustion housing 4 for discharging drain water generated during latent heat recovery.

[0015] The combustion housing 4 is fastened at its rear end to the back plate 16 of the housing 1 with bolts 43. Furthermore, as shown in FIG. 4 , the back plate 16 is provided with hooks 17 that engage with hook portions 44 fixed to the combustion housing 4. Therefore, when the combustion housing 4 is released from the back plate 16 during maintenance, the hooks 17 can be used to hold the combustion housing 4 so that it does not fall. The hook portions 44 are provided in pairs on both sides of the exhaust hood portion 41 of the combustion housing 4, and the hooks 17 are also provided in pairs. A hole 44a is formed in each hook 44, and the hooks 17 are inserted into the holes 44a, allowing the hooks 44 to engage with the hooks 17.

[0016] 5, the hook 17 is composed of a first hook member 171 made of sheet metal having a first base 171a fixed to the front surface of the back plate 16 of the housing 1 and a first support plate portion 171b bent and extending forward at one lateral end (the right end in FIG. 5) of the first base 171a, and a second hook member 172 made of sheet metal having a second base 172a fixed to the front surface of the back plate 16 of the housing 1 adjacent to one lateral end (the right end in FIG. 5) of the first base 171a and a second support plate portion 172b bent and extending forward at the other lateral end (the left end in FIG. 5) of the second base 172a. The first and second support plate portions 171b, 172b are overlapped in the lateral direction, and the hook portion 44 engages with the upper edges of the support plate portions 171b, 172b.

[0017] In this embodiment, the hook 17 is constructed by stacking two hook members (first and second) 171, 172, improving the strength of the hook 17 and allowing it to support even a heavy combustion enclosure 4 without any problems. To support a heavy combustion enclosure 4 with a hook integral with the back plate 16 of the housing 1, the back plate 16 would need to be thick. However, in this embodiment, the hook 17 is separate from the back plate 16, eliminating the need to thicken the back plate 16 and reducing costs. While it may be possible to construct the hook with a single hook member with a thickness of 2 mm or more, the thickness of typical steel plates is 1.6 mm or less, and hook members with a thickness of 2 mm or more would be significantly more expensive. In contrast, in this embodiment, the thickness of the first and second hook members 171, 172 may be thin (e.g., 1.2 mm). Even when two hook members 171, 172 are used, the unit cost is lower than that of a single hook member, further reducing costs.

[0018] It is also possible to form a hook similar to the two-plate structure by folding one metal plate together in a folded state. However, since the process of folding a metal plate together in a folded state is cumbersome and costly, it is more cost-effective to form the hook 17 by overlapping the first and second hook members 171, 172 as in this embodiment.

[0019] Furthermore, in this embodiment, a pair of positioning male engaging portions 173, 173 consisting of protrusions that protrude laterally toward the second support plate portion 172b are formed on the first support plate portion 171b by half-punching, and a pair of positioning female engaging portions 174, 174 consisting of holes with which the male engaging portions 173, 173 engage are formed on the second support plate portion 172b by punching. According to this, by engaging the male engaging portion 173 with the female engaging portion 174, the first and second hook members 171, 172 can be combined in a positioned state and handled as a single component, improving assembly workability.

[0020] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the male engaging portion 173 is formed on the first support plate portion 171b and the female engaging portion 174 is formed on the second support plate portion 172b, but the male engaging portion 173 may be formed on the second support plate portion 172b and the female engaging portion 174 may be formed on the first support plate portion 171b. Also, the end of the combustion housing 4 to which the burner 2 is attached may be the lower end or upper end rather than the front end as in the above embodiment. Furthermore, the heat exchanger 3 may be of a type other than that of the above embodiment, such as a fin tube type. [Explanation of symbols]

[0021] 1...housing, 16...back plate, 17...hook, 171...first hook member, 171a...first base portion, 171b...first support plate portion, 172...second hook member, 172a...second base portion, 172b...second support plate portion, 173...male engaging portion, 174...female engaging portion, 2...burner, 3...heat exchanger, 4...combustion housing, 44...hook portion.

Claims

1. A heat source machine in which a combustion case with a built-in heat exchanger and a burner attached to the end is stored in a housing, and a hook is provided on the back plate of the housing to engage with a fixed hook portion on the combustion case, The hook is composed of a first hook member made of sheet metal having a first base portion fixed to the front surface of the back plate of the housing and a first support plate portion bent forward at one lateral end of the first base, and a second hook member made of sheet metal having a second base portion fixed to the front surface of the back plate of the housing adjacent to one lateral end of the first base and a second support plate portion bent forward at the other lateral end of the second base, and the first and second support plate portions are overlapped horizontally and hook portions engage with the upper edges of both support plate portions.

2. The heat source machine described in claim 1, characterized in that one of the first support plate portion and the second support plate portion has a male engagement portion for positioning that protrudes laterally toward the other of the first support plate portion and the second support plate portion, and the other of the first support plate portion and the second support plate portion has a female engagement portion for positioning that engages with the male engagement portion.

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