Exhaust adapter

Abstract

An exhaust adaptor (2) to be attached to a front surface of an exterior case (1) of a combustion apparatus includes a duct (22) in which an exhaust passage (21) extending in an X-axis direction is defined, an inflow port (24) connected to an exhaust port (13) and communicating with the exhaust passage (21) is provided on a rear surface of the duct (22), and an outflow port (25) for discharging combustion exhaust gas flowing through the exhaust passage (21) to the outside is provided on one end surface of the duct (22) in the X-axis direction.SOLUTION: A dividing plate 27 for dividing the exhaust flow passage 21 in the longitudinal direction is provided in the duct 22. A plurality of first communication holes 271 for communicating the exhaust passage part 21r on the rear side of the division plate 27 with the exhaust passage part 21f on the front side are provided in the division plate 27 at intervals in the X-axis direction. A second communication hole 272 for communicating the rear side exhaust gas flow passage part 21r with the front side exhaust gas flow passage part 21f is provided in the dividing plate 27 in the vicinity of the inflow port 24.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an exhaust adapter that is attached to the front surface of an exterior case of a combustion apparatus in order to change the exhaust direction of combustion exhaust gas from an exhaust port provided on the front surface according to the installation situation of the combustion apparatus. [Background technology]

[0002] Conventionally, as an exhaust adapter of this type, there is known a duct having an internal exhaust flow path that extends in the X-axis direction, which is a direction perpendicular to the front-to-rear direction, and an inlet that is connected to the exhaust port and communicates with the exhaust flow path provided on the rear surface of the duct, and an outlet that discharges combustion exhaust gas that has flowed into the exhaust flow path to the outside opened on one end surface of the duct in the X-axis direction (see, for example, Patent Document 1).

[0003] In the above-mentioned conventional example, the cross-sectional area of ​​the exhaust flow path is large, so there are areas with high and low gas flow velocities in the exhaust flow path, causing stagnation in the flow of combustion exhaust gas and making the flow of combustion exhaust gas unstable.When the flow of combustion exhaust gas becomes unstable, pressure fluctuations caused by switching the combustion load, etc., generate resonance noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-59645 A 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 an exhaust adapter that can suppress the generation of resonance noise. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides an exhaust adapter that is attached to the front surface of an exterior case of a combustion device in order to change the discharge direction of combustion exhaust gas from an exhaust port provided on the front surface in accordance with the installation conditions of the combustion device, the exhaust adapter having a duct that defines an exhaust flow path extending in the X-axis direction, with one direction perpendicular to the front-to-rear direction being the X-axis direction, and an inlet that is connected to the exhaust port and communicates with the exhaust flow path is provided on the rear surface of the duct, and an outlet that discharges the combustion exhaust gas that has flowed into the exhaust flow path to the outside is opened on one end face of the duct in the X-axis direction, wherein a dividing plate that divides the exhaust flow path in the front-to-rear direction is provided within the duct, and a plurality of first communication holes that communicate between the exhaust flow path portion on the rear side of the dividing plate and the exhaust flow path portion on the front side are provided at intervals in the X-axis direction.

[0007] According to the present invention, the combustion exhaust gas flowing in from the inlet mainly flows into the exhaust passage portion on the rear side of the dividing plate, where the cross-sectional area is narrowed by dividing the exhaust passage. Therefore, the overall flow velocity of the combustion exhaust gas flowing through the rear exhaust passage portion is increased, resulting in a rectifying effect, reducing stagnation and stabilizing the flow of the combustion exhaust gas. This suppresses the generation of resonance noise due to pressure fluctuations associated with switching of the combustion load, which are likely to occur when the flow of the combustion exhaust gas is unstable. Furthermore, even if air column vibration occurs in the exhaust passage portion on the rear side of the dividing plate, pressure escapes to the exhaust passage portion on the front side of the dividing plate through the communication holes located in the X-axis direction that coincide with the antinode of the air column vibration, preventing the amplification of the air column vibration and effectively suppressing the generation of resonance noise.

[0008] In the present invention, it is also preferable to provide the inlet on the rear surface of the duct near the other end in the X-axis direction, and to provide multiple or a single second communication hole in the portion of the dividing plate near the other end in the X-axis direction, connecting the exhaust passage portion on the rear side of the dividing plate with the exhaust passage portion on the front side. With this, even if the pressure of the combustion exhaust gas flowing in from the inlet temporarily increases due to pressure fluctuations accompanying a change in combustion load, for example, the pressure will escape to the exhaust passage portion on the front side of the dividing plate via the second communication hole located near the inlet, thereby suppressing the generation of resonance noise.

[0009] Furthermore, if the amount of combustion exhaust gas flowing into the front exhaust passage portion of the dividing plate through the second communication holes increases, the pressure in the front exhaust passage portion increases, making it difficult for the pressure to escape to the front exhaust passage portion through the first communication holes. Therefore, when multiple second communication holes are provided, the total opening area of ​​these second communication holes is made smaller than the total opening area of ​​the first communication hole, and when a single second communication hole is provided, the opening area of ​​this second communication hole is made smaller than the total opening area of ​​the first communication hole, so as to prevent an excessive increase in the amount of combustion exhaust gas flowing into the front exhaust passage portion of the dividing plate through the second communication holes. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a combustion device to which an exhaust adapter according to a first embodiment of the present invention is attached. [Figure 2] FIG. 2 is an enlarged cross-sectional plan view of a main part taken along line II-II in FIG. [Figure 3] FIG. 2 is an exploded perspective view of the exhaust adapter of the first embodiment. [Figure 4] A cross-sectional front view taken along line IV-IV in Figure 2. [Figure 5] 5 is a cross-sectional front view corresponding to FIG. 4 of an exhaust adapter according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 and 2, reference numeral 1 denotes an exterior case of a combustion device comprising a heat source unit. A cylindrical exhaust port 13 protruding forward through an opening 12 formed at the top of a front panel 11, which is the front face of the exterior case 1. The exterior case 1 houses a combustion unit, a combustion fan that supplies combustion air to the combustion unit, and a heat exchanger that heats water by heat exchange with the combustion exhaust gas from the combustion unit, and the combustion exhaust gas that passes through the heat exchanger is discharged to the outside through the exhaust port 13.

[0012] If an obstacle exists in front of the installation location of the combustion device, the combustion exhaust gas discharged from the exhaust port 13 will hit the obstacle. In this case, an exhaust adapter 2 is attached to the front panel 11 to change the discharge direction of the combustion exhaust gas from the exhaust port 13 to a direction other than forward, for example, to the side.

[0013] 2 and 3, the exhaust adapter 2 is provided with a duct 22 in which an exhaust flow path 21 extending in the X-axis direction is defined inside, with one direction perpendicular to the front-rear direction being the X-axis direction (the horizontal direction in the illustrated example) and a direction perpendicular to the front-rear direction and the X-axis direction being the Y-axis direction (the up-down direction in the illustrated example), and a duct cover 23 that covers the duct 2 from the front and both sides in the Y-axis direction. The duct 22 is configured by combining a base member 221 facing the front panel 11 with a cover member 222 that defines the exhaust flow path 21 between the base member 221 and the cover member 222.

[0014] A cylindrical inlet 24 that communicates with the exhaust flow path 21 and is fitted onto the exhaust port 13 is provided on the rear surface of the duct 22, i.e., on the base member 221. Furthermore, an outlet 25 is formed on one end surface of the duct 22 in the X-axis direction, for discharging the combustion exhaust gas that has flowed into the exhaust flow path 21 to the outside. Furthermore, a louver plate 26 bent like a sawtooth is attached to the inner surface of one end surface of the duct 22 in the X-axis direction. The combustion exhaust gas is discharged from the outlet 25 to the outside through a plurality of window holes 261 formed in the louver plate 26.

[0015] The duct 22 includes a cover member 223 that closes the other end face in the X-axis direction of the exhaust flow path 21. The inlet 24 is provided in a portion of the base member 221 near the other end in the X-axis direction.

[0016] Furthermore, the exhaust adapter 2 of this embodiment is provided with a dividing plate 27 disposed within the duct 22, which divides the exhaust flow path 21 in the front-rear direction. Referring also to Figure 4, dividing plate 27 is provided with a plurality of first communication holes 271 spaced apart in the X-axis direction, which connect the rear exhaust flow path portion 21r of dividing plate 27 with the front exhaust flow path portion 21f. Furthermore, a portion of dividing plate 27 closer to the other side in the X-axis direction is provided with a plurality of second communication holes 272 spaced apart in the Y-axis direction, which connect the rear exhaust flow path portion 21r of dividing plate 27 with the front exhaust flow path portion 21f.

[0017] The position in the X-axis direction where the second communication holes 272 are present is shifted in one direction in the X-axis direction from the position in the X-axis direction that coincides with the other end of the inlet 24 in the X-axis direction, but it may be shifted in the other direction in the X-axis direction from this position in the X-axis direction. The total opening area of ​​the second communication holes 272 is smaller than the total opening area of ​​the first communication holes 271. Specifically, eleven first communication holes 271 with a hole diameter of 5 mm are provided, and the total opening area of ​​the first communication holes 271 is set to approximately 216 mm 2 Eleven second communication holes 272 with a hole diameter of 2 mm are provided, and the total opening area of ​​the second communication holes 272 is approximately 35 mm 2 It states that:

[0018] According to the above configuration, by dividing the exhaust flow path 21, the cross-sectional areas of the exhaust flow path portions 21r, 21f on the rear and front sides of the dividing plate 27 are narrowed. The combustion exhaust gas flowing in from the inlet 24 mainly flows into the exhaust flow path portion 21r on the rear side of the dividing plate 27, which has a narrower cross-sectional area. As a result, the flow velocity of the combustion exhaust gas flowing into the rear exhaust flow path portion 21r increases overall, resulting in a rectifying effect, reducing stagnation and stabilizing the flow of the combustion exhaust gas. This makes it possible to suppress the generation of resonance noise due to pressure fluctuations that tend to occur when the flow of combustion exhaust gas is unstable, such as when switching the combustion load.

[0019] Furthermore, even if air column vibration occurs in the rear exhaust passage portion 21r of the dividing plate 27, pressure escapes to the front exhaust passage portion 21f of the dividing plate 27 through the first communication hole located in the X-axis direction at or near the antinode of the air column vibration. Therefore, the air column vibration is not amplified, and the occurrence of resonance noise is effectively suppressed. Even if the frequency of the air column vibration changes and the position of the antinode changes, pressure escapes through the first communication hole 271 located near the antinode among the multiple first communication holes 271, thereby achieving the above-mentioned effect. Furthermore, even if the pressure of the combustion exhaust gas flowing in from the inlet 24 temporarily increases due to pressure fluctuations caused by switching the combustion load, etc., pressure escapes to the front exhaust passage portion 21f of the dividing plate 27 through the second communication hole 272 located near the inlet 24, thereby suppressing the occurrence of resonance noise.

[0020] Furthermore, if the amount of combustion exhaust gas flowing into the front exhaust flow passage portion 21f of the dividing plate 27 through the second communication holes 272 increases, the pressure in the front exhaust flow passage portion 21f increases, making it difficult for the pressure to escape to the front exhaust flow passage portion 21f through the first communication holes 271. Therefore, as described above, the total opening area of ​​the multiple second communication holes 272 is made smaller than the total opening area of ​​the multiple first communication holes 271 to prevent the amount of combustion exhaust gas flowing into the front exhaust flow passage portion 21f through the second communication holes 272 from increasing too much.

[0021] Next, an exhaust adapter 2 of a second embodiment shown in FIG. 5 will be described. The basic structure of the exhaust adapter 2 of the second embodiment is not particularly different from that of the first embodiment, and the same members and parts as those of the first embodiment are denoted by the same reference numerals. The difference from the first embodiment is that a single second communication hole 272 with an opening area smaller than the total opening area of ​​the first communication holes 271 is provided in a portion of the dividing plate 27 near the other end in the X axis direction. More specifically, a notch that becomes the second communication hole 272 is formed in the other end edge in the X axis direction of the dividing plate 27. The dimensions of the second communication hole 272 are, for example, 2 mm wide in the X axis direction, 71 mm long in the Y axis direction, and 142 mm 2 The total opening area of ​​the first communication holes 271 is approximately 216 mm 2 , similar to the first embodiment. 2, and the opening area of ​​the second communication hole 272 is smaller than this. The second embodiment also provides the same effects as the first embodiment. Note that in the second embodiment, the X-axis position at which the second communication hole 272 is located is generally shifted in the other X-axis direction from the X-axis position that coincides with the other end of the inlet 24 in the X-axis direction, but as in the first embodiment, the second communication hole 272 may be shifted in one X-axis direction from this X-axis position.

[0022] 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, all of the first communication holes 271 are positioned at the same Y-axis position, but the Y-axis positions of the first communication holes 271 may be shifted. Furthermore, in the first embodiment, only one first communication hole row consisting of multiple first communication holes 271 aligned in the X-axis direction and only one second communication hole row consisting of multiple second communication holes 272 aligned in the Y-axis direction are provided. However, multiple first communication hole rows may be provided spaced apart in the Y-axis direction, and multiple second communication hole rows may be provided spaced apart in the X-axis direction. In this case, it is desirable to make the hole diameters of the first communication holes 271 and the second communication holes 272 smaller than those in the above embodiment. Furthermore, in the above embodiment, the X-axis direction is the horizontal direction, but the X-axis direction may be other than the horizontal direction, for example, tilted up or down relative to the horizontal direction, or vertical. [Explanation of symbols]

[0023] 1...exterior housing, 11...front panel (front surface of exterior housing), 13...exhaust port, 2...exhaust adapter, 21...exhaust flow path, 21r...rear exhaust flow path portion, 21f...front exhaust flow path portion, 22...duct, 221...base member (rear surface of duct), 24...inlet, 25...outlet, 27...dividing plate, 271...first communication hole, 272...second communication hole.

Claims

1. An exhaust adapter is attached to the front surface of an exterior case of a combustion device in order to change the exhaust direction of combustion exhaust gas from an exhaust port provided on said front surface in accordance with the installation situation of the combustion device, and is provided with a duct having an exhaust flow path defined therein extending in the X-axis direction, with one direction perpendicular to the front-to-rear direction being defined as the X-axis direction, and an inlet connected to the exhaust flow path and connected to the exhaust port is provided on the rear surface of the duct, and an outlet is opened on one end surface of the duct in the X-axis direction to discharge combustion exhaust gas that has flowed into the exhaust flow path to the outside, An exhaust adapter characterized in that a dividing plate that divides the exhaust flow path in the front-to-rear direction is provided within the duct, and a plurality of first communication holes that connect the exhaust flow path portion on the rear side of the dividing plate with the exhaust flow path portion on the front side of the dividing plate are provided at intervals in the X-axis direction.

2. 2. The exhaust adapter according to claim 1, wherein the inlet is provided on the rear surface of the duct near the other end in the X-axis direction, and a plurality of second communication holes are provided in the portion of the dividing plate near the other end in the X-axis direction, connecting the rear exhaust flow path portion of the dividing plate with the front exhaust flow path portion, and the total opening area of ​​these second communication holes is smaller than the total opening area of ​​the first communication holes.

3. 2. The exhaust adapter according to claim 1, wherein the inlet is provided in a portion of the rear surface of the duct near the other end in the X-axis direction, and a single second communication hole having an opening area smaller than the total opening area of ​​the first communication holes is provided in a portion of the dividing plate near the other end in the X-axis direction, connecting the rear exhaust flow path portion of the dividing plate with the front exhaust flow path portion.

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