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 fan connected to a gas inflow tube part extending downwardly from the burnet, in which the fan only can be removed from a front side in a state where the combustion casing is assembled to the housing for improving a workability during maintenance.SOLUTION: A heat source machine includes: a cylindrical inflow pipe side joint part 22 provided at an upstream end of the gas inflow tube part; and a cylindrical fan-side joint part 52 provided at a downstream end of the fan and which fits with the inflow pipe side joint part 22. A first projection piece 221 projects at the inflow pipe side joint part 22 along a surface vertical with a front-rear direction, and a second projection piece 521 projects at the fan side joint part 52 that overlaps with the first projection piece 221 in the front-rear direction. The first and second projection pieces 221, 521 are fastened by a fastening member 53 inserted from a front side into the holes 222, 522 formed on the projection pieces in the front-rear direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a heat source machine in which a combustion case with a built-in heat exchanger and a burner attached to the front end is housed within a housing with a removable front plate, and a fan connected to a gas inlet pipe extending downward from the burner, and a mixture of fuel gas and primary air is supplied to the burner via the fan and the gas inlet pipe. [Background technology]

[0002] A known example of this type of heat source machine is described in Patent Document 1. In this machine, a flange portion at the lower end of the gas inlet pipe (which is the upstream end) and a flange portion at the upper end of the fan casing (which is the downstream end of the fan) are stacked one on top of the other, and the two flange portions are fastened together with bolts inserted from above into vertical holes formed in both flange portions. To ensure a seal between the two flange portions, the two flange portions must also be fastened together on the rear side, which is behind the gas inlet pipe when viewed from the front. Therefore, it is difficult to fasten the flange portion at the upper end of the fan casing to the flange portion at the lower end of the gas inlet pipe after the combustion enclosure is assembled inside the housing. Therefore, the flange portion at the upper end of the fan casing is fastened to the flange portion at the lower end of the gas inlet pipe before assembling the combustion enclosure to the housing.

[0003] In the above-mentioned conventional example, even when inspecting the fan during maintenance after installation, it is not possible to remove the fan alone. Therefore, after removing the combustion case from the housing, it is necessary to release the fastening of the flange at the upper end of the fan casing from the flange at the lower end of the gas inlet pipe, and then remove the fan, which makes maintenance work less efficient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] EP3524882A1 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 that allows the fan to be removed while the combustion case is attached to the housing, in order to improve workability during maintenance. [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 incorporating a heat exchanger with a burner attached to its front end and a fan connected to a gas inlet pipe extending downward from the burner are housed within a housing having a removable front plate, and a mixture of fuel gas and primary air is supplied to the burner via the fan and the gas inlet pipe, the heat source machine comprising: a cylindrical inlet pipe side joint provided at the upstream end of the gas inlet pipe; and a cylindrical fan side joint provided at the downstream end of the fan and fitted into the inlet pipe side joint, a first protrusion portion protruding from the inlet pipe side joint so as to extend along a plane perpendicular to the front-to-rear direction, and a second protrusion portion protruding from the fan side joint so as to overlap the first protrusion portion in the front-to-rear direction, and the first and second protrusion portions are fastened by fastening members inserted from the front into front-to-rear holes formed in both protrusion portions.

[0007] According to the present invention, with the combustion case attached to the housing, the fastening members fastening the first and second protrusions together can be loosened from the front, releasing the fastening of the two protrusions and allowing the fan to be removed alone, thereby improving workability during maintenance.

[0008] In addition, in the present invention, it is desirable to provide the first protrusion with a hook that engages with the lower edge of the second protrusion. This allows the hook to hold the fan so that it does not fall when fastening or unfastening the second protrusion to the first protrusion. Therefore, there is no need to hold the fan with your hand when fastening or unfastening the second protrusion to the first protrusion, further improving 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 a perspective view of a main part of the heat source machine according to the embodiment. [Figure 5] (a) An oblique view of the inlet pipe side joint part and the fan side joint part of the heat source machine of the embodiment, (b) an oblique view of the inlet pipe side joint part and the fan side joint part as seen from a direction different from that of Figure 5(a), (c) an oblique view of the inlet pipe side joint part and the fan side joint part in a separated 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 23 to which the air-fuel mixture is supplied from the gas inlet pipe section 21, and a combustion plate 24 that covers the rear-facing open surface of the burner body 23. The air-fuel mixture ejected from the combustion plate 24 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 rear end of the combustion case 4 is fastened to the back plate 16 of the housing 1 with bolts 43. The fan 5 connected to the gas inlet pipe 21 is supported in a suspended state in the combustion case 4 via the burner 2. Here, to facilitate maintenance after installation, it is desirable to be able to remove only the fan 5 so that it can be inspected.

[0016] 4 and 5, in this embodiment, a cylindrical inlet pipe joint 22 is provided at the lower end, which is the upstream end, of the gas inlet pipe 21, and a cylindrical fan joint 52 that fits into the inlet pipe joint 22 is provided at the upper end of the fan casing 51, which is the downstream end of the fan 5. In this embodiment, the inlet pipe and fan joints 22, 52 are configured as separate parts that are later attached to the gas inlet pipe 21 and the fan casing 51, but it is also possible to mold these joints 22, 52 integrally with the gas inlet pipe 21 and the fan casing 51.

[0017] Two first protrusions 221, #1 located on the left side when viewed from the front, and #2 located on the right side, are protruding from the inlet pipe-side joint 22 along a plane perpendicular to the front-to-rear direction. Two second protrusions 521, #1 and #2 are protruding from the fan-side joint 52, overlapping in the front-to-rear direction with the first protrusions 221, #1 and #2, respectively. The first protrusions 221, #1 and #2, and the second protrusions 521, #1 and #2, are fastened together by bolts 53, which serve as fastening members, and are inserted from the front into holes 222, 522 formed in the first and second protrusions 221, 521 in the front-to-rear direction.

[0018] With this, with the combustion case 4 attached to the housing 1, the bolts 53 fastening the first and second protrusions 221, 521 together can be loosened from the front, releasing the fastening of the protrusions 221, 521 and allowing removal of only the fan 5. This improves workability during maintenance.

[0019] In this embodiment, the fan side joint part 52 is fitted from below into the inlet pipe side joint part 22 in a phase in which the second protrusion part 521 of #1 and the second protrusion part 521 of #2 are respectively in front of the first protrusion part 221 of #1 and behind the first protrusion part 221 of #2, and then the fan side joint part 52 is rotated clockwise when viewed from above, so that the second protrusion part 521 of #1 overlaps with the front surface of the first protrusion part 221 of #1 and the second protrusion part 521 of #2 overlaps with the rear surface of the first protrusion part 221 of #2. Then, the bolt 53 is threaded through a hole 522 formed in the second protrusion portion 521 of #1 and into a hole 222 formed in the first protrusion portion 221 of #1, thereby fastening the first and second protrusion portions 221, 521 of #1, and the bolt 53 is threaded through a hole 222 formed in the first protrusion portion 221 of #2 and into a hole 522 formed in the second protrusion portion 521 of #2, thereby fastening the first and second protrusion portions 221, 521 of #2.

[0020] Additionally, the #1 first protrusion 221 is provided with a hook portion 223 that protrudes forward from the lower front surface thereof and engages with the lower edge of the #1 second protrusion 521, and the #2 first protrusion 221 is provided with a hook portion 223 that protrudes rearward from the lower rear surface thereof and engages with the lower edge of the #2 second protrusion 521. This allows the hook portion 223 to hold the fan 5 so that it does not fall when fastening or unfastening the #1 and #2 second protrusions 521 to the #1 and #2 first protrusions 221. Therefore, there is no need to hold the fan 5 by hand when fastening or unfastening the #1 and #2 second protrusions to the #1 and #2 first protrusions 221, further improving workability.

[0021] 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 heat exchanger 3 has the heat exchange section 32 in which the heat absorption pipe 31 is wound in a spiral shape, but it is also possible to use other types of heat exchangers, such as a fin tube type. [Explanation of symbols]

[0022] 1...housing, 2...burner, 21...gas inlet pipe section, 22...inlet pipe side joint section, 221...first protrusion section, 222...hole, 223...hook section, 3...heat exchanger, 4...combustion housing, 5...fan, 52...fan side joint section, 521...second protrusion section, 522...hole, 53...bolt (fastening member).

Claims

1. A heat source machine in which a combustion case incorporating a heat exchanger with a burner attached to the front end and a fan connected to a gas inlet pipe extending downward from the burner are housed in a housing having a removable front plate, and a mixture of fuel gas and primary air is supplied to the burner via the fan and the gas inlet pipe, A heat source machine comprising: a cylindrical inlet pipe side joint portion provided at the upstream end of the gas inlet pipe portion; and a cylindrical fan side joint portion provided at the downstream end of the fan and fitting into the inlet pipe side joint portion; a first protrusion portion protruding from the inlet pipe side joint portion so as to extend along a plane perpendicular to the front-to-rear direction; and a second protrusion portion protruding from the fan side joint portion so as to overlap the first protrusion portion in the front-to-rear direction; and the first and second protrusion portions are fastened together by fastening members inserted from the front into front-to-rear holes formed in both protrusion portions.

2. The heat source machine according to claim 1, wherein the first protruding piece is provided with a hook portion that engages with a lower edge of the second protruding piece.

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