Heat source machine

Abstract

This heat source machine stores, in a housing, a combustion case having a built-in heat exchanger in which a burner is attached to the front end, and a fan connected to a gas inflow pipe part extending downward from the burner, the heat source machine making it possible to remove only the fan from the front in a state where the combustion case is assembled to the housing in order to improve workability during maintenance. The present invention comprises: a cylindrical inflow pipe-side joint part (22) provided at the upstream end of the gas inflow pipe part; and a cylindrical fan-side joint part (52) provided at the downstream end of the fan and fitted to the inflow pipe-side joint part (22). The inflow pipe-side joint part (22) is provided with a first protruding piece part (221) so as to protrude along a surface orthogonal to the front-rear direction, and the fan-side joint part (52) is provided with a second protruding piece part (521) that overlaps the first protruding piece part (221) in the front-rear direction. Both the first and second protruding piece parts (221, 521) are fastened by a fastening member (53) inserted from the front into holes (222, 522) in the front-rear direction formed in both the protruding piece parts.

Description

heat source machine

[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.

[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 within 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.

[0004] EP3524882A1

[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.

[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 provided on the inlet pipe side joint so as to extend along a plane perpendicular to the front-to-rear direction, and a second protrusion provided on the fan side joint so as to overlap the first protrusion in the front-to-rear direction, and the first and second protrusions are fastened from the front by fastening members inserted from the front into front-to-rear holes formed in both protrusions.

[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 preferable that the first protrusion has a hook portion that engages with the lower edge of the second protrusion. This allows the hook portion 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 down with your hand when fastening or unfastening the second protrusion to the first protrusion, further improving workability.

[0009] 5A and 5B are perspective views of a heat source machine according to an embodiment of the present invention; a front view of the heat source machine according to an embodiment with a portion of the front plate thereof removed; a cross-sectional view taken along III-III in Fig. 2; perspective views of essential parts of the heat source machine according to an embodiment; (a) a perspective view of an inflow pipe side joint and a fan side joint of the heat source machine according to an embodiment; (b) a perspective view of the inflow pipe side joint and the fan side joint as viewed from a different direction from Fig. 5A; and (c) a perspective view of the inflow pipe side joint and the fan side joint in a separated state.

[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 chamber 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 inside the premixing section 6. 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. The mixture of fuel gas and primary air is then supplied to the burner 2 via the fan 5 and the gas inlet pipe 21.

[0011] The top surface of the housing 1 is provided with a cylindrical exhaust connection port 12 to which an exhaust pipe (not shown) extending to the outdoors can be connected, a cylindrical first air intake connection port 13 surrounding the 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 the first air intake connection port 13 with the cover member 131 removed. When a non-double-pipe air intake pipe is used, the air intake pipe is connected to the second air intake connection port 14 with the 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 lateral 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 21, and a combustion plate 24 covering the rearward-facing open surface of the burner body 23. The air-fuel mixture ejected from the combustion plate 24 undergoes total primary combustion (combustion without secondary air) within the combustion chamber 4. The combustion chamber 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 extending 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 sensible heat heats the water in the heat absorption pipe 31. In the portion rearward of the 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 latent heat heats the water in the heat absorption pipe 31.

[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 shielding 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] The inlet pipe-side joint 22 has two first protrusions 221, #1 located on the left side when viewed from the front, and #2 located on the right side, protruding along a plane perpendicular to the front-to-rear direction. The fan-side joint 52 also has two second protrusions 521, #1 and #2 protruding so as to overlap the first protrusions 221, #1 and #2 in the front-to-rear direction, 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 assembled 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 with the #1 second protrusion 521 and the #2 second protrusion 521 spaced apart in front of the #1 first protrusion 221 and rear of the #2 first protrusion 221, respectively, and then the fan-side joint part 52 is rotated clockwise as viewed from above so that the #1 second protrusion 521 overlaps the front surface of the #1 first protrusion 221 and the #2 second protrusion 521 overlaps the rear surface of the #2 first protrusion 221. Then, a bolt 53 is threaded through a hole 522 formed in the #1 second protrusion 521 and into a threaded hole 222 formed in the #1 first protrusion 221, thereby fastening the #1 first protrusion 221 and the #1 second protrusion 521 together. In addition, the bolt 53 is threaded through a hole 222 formed in the first protrusion 221 of #2 into a hole 522 formed in the second protrusion 521 of #2, thereby fastening the first protrusion 221 of #2 and the second protrusion 521 of #2 together.

[0020] Furthermore, 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 with one's 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 embodiment of the present invention has 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.

[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 with a built-in heat exchanger and a burner attached to the front end and a fan connected to a gas inlet pipe extending downward from the burner are housed within a housing with 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 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 that fits into the inlet pipe joint, a first protrusion provided on the inlet pipe joint so as to extend along a plane perpendicular to the front-to-rear direction, and a second protrusion provided on the fan-side joint that overlaps the first protrusion in the front-to-rear direction, and the first and second protrusions are fastened from the front by fastening members inserted from the front into front-to-rear holes formed in both protrusions.

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

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