JP2012107815A - Latent heat recovery type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent heat recovery type water heater in which drain water generated in an exhaust connection body can flow into an exhaust path without being accumulated at specific locations.SOLUTION: A bottom surface 29 of a mounting member 26 is inclined downward toward an opening 32 in connection with the exhaust path 10. A burring part 37 bent in a bottom surface 29 direction of the mounting member 26 is provided in a seal material 28 for sealing between the mounting member 26 and a connection port member 27. Thus, the drain water generated in the exhaust duct 24 is dripped to the bottom surface 29 along the burring part 37 without leaking from the connection surface with the mounting member 26 and the connection port member 27, and guided to the opening 32 by downward inclination of the bottom surface 29. Thus, the drain water is not accumulated at the specific locations of the exhaust connection body 25, and preventing corrosion of members comprising the exhaust connection body 25.

Description

  The present invention relates to a latent heat recovery type water heater provided with a secondary heat exchanger for recovering latent heat.

  Conventionally, in this type, as shown in FIG. 5, an apparatus main body 101, a burner 102 for burning fuel, and a primary heat exchanger for exchanging heat with air heated by the combustion of the burner 102 are provided. The secondary heat exchange chamber 104 provided with a secondary heat exchanger for exchanging heat with the combustion chamber 103, and the combustion gas that has passed through the combustion chamber 103, and drain water generated in the secondary heat exchange chamber 104 are recovered. The neutralizer 105 for neutralization, the drain discharge path 106 below the secondary heat exchange chamber 104 for flowing drain water into the neutralizer 105, and the exhaust gas heat-exchanged in the secondary heat exchange chamber 104 101 includes an exhaust path 107 that discharges to the outside, an exhaust duct 108 that guides the exhaust gas to the outdoors, and an exhaust connector 109 that has a lower end connected to the exhaust path 107 and an upper end connected to the exhaust duct 108. The inside connecting body 109 was something exhaust gas is discharged through the outdoor.

  In such an apparatus main body 101, the secondary heat exchange chamber 104 becomes a low-temperature exhaust gas after the latent heat contained in the combustion gas is recovered, so that the moisture contained in the exhaust gas aggregates. Strongly acidic drain water is generated. This drain water falls downward from the exhaust duct 108 and the exhaust connector 109, flows into the neutralizer 105 from the drain discharge path 106, and is discharged after being neutralized. (For example, Patent Document 1)

JP 2010-29811 A

  However, in this conventional one, the exhaust gas whose temperature has been reduced in the secondary heat exchange chamber 104 is aggregated and adheres to the inner surface of the exhaust connector 109 and stays without flowing down from the exhaust connector 109. Therefore, there is a possibility that a member at a specific location constituting the inside of the exhaust connector 109 is corroded by the strongly acidic drain water.

  In addition, drain water may leak to the outside through the gaps between the members constituting the exhaust connector 109, which may damage not only the exhaust connector 109 but also the outside.

  In order to solve the above-mentioned problems, in claim 1 of the present invention, an apparatus main body, a combustion chamber in which a primary heat exchanger for heating a heat medium by combustion of a burner is installed, and combustion gas that has passed through the combustion chamber are used. A secondary heat exchange chamber in which a secondary heat exchanger that heats the heat medium by collecting latent heat is installed, an exhaust path that is connected to the secondary heat exchange chamber and through which the exhaust gas after heat exchange with the heat medium passes, An exhaust duct that exhausts the exhaust gas that has passed through the exhaust path to the outside; and an exhaust connector that connects the exhaust path and the exhaust duct. The exhaust connector has an opening connected to the exhaust path on a bottom surface. In a latent heat recovery type hot water supply apparatus comprising: a mounting member provided; a connection port member connected to the mounting member and the exhaust duct; and a seal member that seals between the mounting member and the connection port member , With the bottom surface of the mounting member facing the opening Ri is obtained by tilting.

  According to a second aspect of the present invention, the sealing material is formed with a burring portion bent toward the bottom surface of the mounting member.

  According to a third aspect of the present invention, the bottom surface of the mounting member is formed in an oval cross section.

  According to the first aspect of the present invention, the drain water flows along the slope of the bottom surface by inclining the bottom surface of the mounting member constituting the exhaust connector downward toward the opening connected to the exhaust path. Since it reaches the opening, the drain water does not stay at a specific location on the bottom surface and is smoothly guided to the exhaust path, and corrosion of members constituting the exhaust connector can be prevented.

  Further, according to claim 2, by forming the burring portion bent in the bottom direction of the mounting member on the sealing material, it is possible to reliably prevent drain water from leaking from the connection surface between the connection port member and the mounting member. The drain water flowing down from the mouth member can be guided to the bottom surface of the mounting member.

  According to the third aspect of the present invention, it is easy to set the formation position of the opening provided on the bottom surface of the mounting member by forming the bottom surface of the mounting member in an oval cross section. It is possible to prevent positional displacement at the connection surface with the material.

Schematic configuration diagram showing an embodiment of the present invention Main part enlarged view of the same embodiment Main part enlarged view of the same embodiment Main part enlarged view of the same embodiment Schematic configuration diagram showing an embodiment of a conventional latent heat recovery type hot water heater

Next, a latent heat recovery type water heater according to an embodiment of the present invention will be described with reference to FIG.
DESCRIPTION OF SYMBOLS 1 is the indoor installation type apparatus main body of this embodiment, 2 is a burner which uses oil etc. as a fuel and generates a flame downward, 3 is a blower which supplies the combustion air to burner 2, 4 is equipped downstream of burner 2 The combustion chambers 5 and 5 are fin tube type primary heat exchangers that are provided in the combustion chamber 4 and collect sensible heat of the combustion gas generated by the combustion of the burner 2.

  A silencer 6 is arranged downstream of the combustion chamber 4 and communicates with one end at the bottom of the combustion chamber 4 to reduce noise accompanying discharge of the combustion gas generated by the burner 2, and 7 is a secondary heat for recovering the latent heat of the combustion gas. The exchanger 8 has a secondary heat exchanger 7 installed therein and a secondary heat exchange chamber formed of a stainless steel box, and 9 is connected to the silencer 6 and the secondary heat exchange chamber 8 to generate combustion gas. A connecting path 10 for passing is an exhaust path for exhausting the exhaust gas that has passed through the secondary heat exchange chamber 8 to the outside of the apparatus main body 1. In the secondary heat exchanger 7, the combustion gas that has passed through the silencer 6 is below the dew point. Drain water is produced by heat exchange.

  11 is a neutralizer that communicates with the secondary heat exchange chamber 8 and temporarily stores drain water generated by heat exchange, and 12 is a drain discharge that communicates with the secondary heat exchange chamber 8 and flows the drain water into the neutralizer 11. A path, 13 is a drain outlet for draining drain water neutralized by the neutralizing agent, and 14 is a drain plug capable of discharging all drain water inside the neutralizer 11.

  A water supply pipe 15 is connected to a water pipe and supplies tap water to the primary heat exchanger 5 and the secondary heat exchanger 7, and 16 discharges hot water heated by the primary heat exchanger 5 and the secondary heat exchanger 7. A hot water outlet pipe, 17 is a water supply bypass pipe branched from the water supply pipe 15, 18 is a mixing valve capable of changing the mixing ratio by mixing hot water from the hot water outlet pipe 16 and tap water from the water supply bypass pipe 17, and 19 is a mixing valve 18. A hot water supply pipe for supplying hot water mixed in a hot water tap (not shown), 20 is provided in the water supply pipe 15 to detect the temperature of the water supply, and 21 is provided in the water supply pipe 15 to detect the flow rate. A flow rate sensor 22 is a hot water supply temperature sensor provided in the hot water supply pipe 19 for detecting the hot water supply temperature.

  A control unit 23 is built in the apparatus main body 1 and receives a signal from each sensor of the apparatus main body 1 to control the drive of each actuator.

  Reference numeral 24 denotes an exhaust duct that discharges exhaust gas to the outdoors, and 25 denotes an exhaust connector that connects the exhaust path 10 of the apparatus main body 1 and the exhaust duct 24.

Next, the structure of the exhaust connector 25 will be described with reference to FIGS.
The exhaust connector 25 includes an attachment member 26 connected to the exhaust path 10, a connection port member 27 having a lower portion connected to the attachment member 26 and an upper portion connected to the exhaust duct 24, and between the attachment member 26 and the connection port member 27. And a sealing material 28 disposed on the surface.

  The mounting member 26 has an annular ring portion 30 projecting upward in the horizontal direction on the periphery of the substantially circular bottom surface 29, and a male pipe portion 31 projecting downward at a position offset from the center on the bottom surface 29. An opening 32 is provided and engages the exhaust path 10. The bottom surface 29 is gently inclined so that the opening 32 is located at the lowermost portion from the entire circumference of the ring portion 30. The ring portion 30 is formed with fixing screw holes every 90 ° from the center.

  Further, as shown in FIG. 4, the bottom surface 29 of the attachment member 26 has the same center as the circumference forming the opening 32 and an arc 33 having a larger radius, and the same circumference as the circumference forming the outer peripheral surface of the ring portion 30. An oval shape is formed by coupling an arc 34 having a center and a small radius, and the inner peripheral surface of the ring portion 30 that is the periphery of the bottom surface 29 is also formed in an oval shape.

  The connection port member 27 has a female pipe portion 35 that fits with the exhaust duct 24 in the upper portion, and is provided with a flange portion 36 in which a screw hole is formed in the lower portion. The screw hole of the ring portion 30 and the flange portion 36 is provided. It is installed and fixed at a position where it penetrates.

  The sealing material 28 has a burring portion 37 bent at a substantially right angle toward the bottom surface 29, and is formed in an oval shape so as to come into contact with the inner peripheral surface of the ring portion 30. An annular circumferential surface 38 installed on the upper portion of the ring portion 30 is provided with a screw hole, and the connection surface is sealed in accordance with a position penetrating the screw hole of the ring portion 30 and the flange portion 36.

  With such a configuration, drain water generated inside the exhaust duct 24 flows down from the inner wall of the connection port member 27 to the flange portion 36 and continues to fall along the burring portion 37 formed in the sealing material 28. When it reaches the lower end of the burring portion 37, it drips onto the bottom surface 29 of the mounting member 26 and guides the drain water to flow into the opening 32 by the downward slope attached to the bottom surface 29. It flows smoothly into the exhaust passage 10 without staying in the exhaust passage 10.

  In addition, by forming the bottom surface 29 of the mounting member 26 in an oval shape, the degree of freedom in designing the formation position of the opening 32 is higher than that of a regular circle in determining the formation position of the opening 32 provided on the bottom surface 29. The threaded hole formed in the circumferential surface 38 of the sealing material 28 by forming the burring portion 37 of the material 28 along the inner peripheral surface of the ring portion 30 having the same shape as the peripheral edge of the bottom surface 29 of the mounting member 26. Can be easily aligned with the threaded holes of the ring portion 30 and the flange portion 36, so that the work efficiency is improved and the installation surface is formed in an oval shape so that there is no risk of displacement and close contact. And can be fixed.

  As described above, the bottom surface 29 of the mounting member 26 is inclined downward with the opening 32 at the bottom, and the burring portion 37 that is bent substantially perpendicularly toward the bottom surface 29 of the mounting member 26 is formed on the sealing material 28. Since drain water does not leak from the connection surface between the member 26 and the connection port member 27 and drops onto the bottom surface 29 and is guided along the downward slope of the bottom surface 29 to the opening 32, the drain water is provided at a specific location of the exhaust connector 25. Does not stay and there is no possibility of leaking from the installation surface of the component member to the outside, so that corrosion of the member constituting the exhaust connector 25 can be prevented.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Burner 4 Combustion chamber 8 Secondary heat exchange chamber 10 Exhaust path 24 Exhaust duct 25 Exhaust connection body 26 Mounting member 27 Connection port member 28 Sealing material 29 Bottom surface 30 Ring part 32 Opening 37 Burring part

Claims (3)

  An apparatus main body, a combustion chamber in which a primary heat exchanger for heating a heat medium by combustion of a burner is installed, and a secondary heat exchanger for recovering latent heat from the combustion gas passing through the combustion chamber and heating the heat medium A secondary heat exchange chamber installed inside, an exhaust path connected to the secondary heat exchange chamber through which the exhaust gas after the heat exchange with the heat medium passes, and an exhaust duct for discharging the exhaust gas that has passed through the exhaust path to the outside An exhaust connection body that connects the exhaust path and the exhaust duct, the exhaust connection body having a bottom surface provided with an opening connected to the exhaust path, and the mounting member and the exhaust duct. In the latent heat recovery type water heater constituted by the connected connection port member and a sealing material that seals between the attachment member and the connection port member, the bottom surface of the attachment member is inclined downward toward the opening. Latent heat recovery type water heater   The latent heat recovery type hot water heater according to claim 1, wherein a burring portion bent toward the bottom surface of the mounting member is formed on the sealing material.   The latent heat recovery type hot water supply device according to any one of claims 1 and 2, wherein a bottom surface of the mounting member is formed in an oval cross section.

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