JPH0330767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot air heater that blows air with low noise for heat exchange of fuel such as kerosene.

BACKGROUND ART An oil-burning heater will be explained as a conventional example.

This type of hot air heater had a configuration as shown in FIGS. 3 and 4. In other words, top plate 1 and front plate 2
A combustion tube 6 is placed over the combustion section 5 installed in the ventilation duct, which consists of a bottom plate 3 and side panels 4, and a propeller blower 7 is installed on the upstream side of the combustion tube. By blowing air into the combustion chamber, warm air that has undergone heat exchange in the combustion tube is discharged from the outlet 8. Also,
A lattice-like catalyst purification filter 10 for purifying the air after combustion is disposed in a cross section in which the front of the combustion cylinder top 9 is tilted forward, and a radiation window 11 is provided so that the red-hot state of the catalyst purification filter can be seen from the outside. Radiant heat was also used for heating. 12 is a fan guard that holds a propeller blower, and 14 is an oil combustion heater.

Problems to be Solved by the Invention In this configuration, in order to extract radiant heat from the red heat of the catalyst purification filter, the front of the top of the combustion cylinder is tilted forward as shown in FIG. Therefore, the noise generated in the combustion section passes through the catalyst purification filter and is radiated toward the corner 13 surrounded by the duct top plate and the front plate. As a result, sound tends to be muffled, and moreover, sound with a standing wave frequency that matches the distance between each wall surface (top plate and bottom plate, front plate and rear surface, etc.) tends to resonate, increasing the noise level.

The present invention solves such conventional problems by providing a large number of small holes at the rear of the top of the combustion cylinder, allowing the noise inside the combustion cylinder to radiate from the small holes, and installing the noise between the top plate and the combustion cylinder. By reflecting the sound backward by the partition plate, the purpose is to suppress the muffled sound inside the ventilation duct, prevent the occurrence of resonance phenomena such as standing waves, and reduce the noise level.

Means for Solving the Problems In order to solve the above problems, the present invention provides a blower duct comprising a top plate, a bottom plate, side plates and a front plate, a blower on the upstream side of the blower duct, and
In addition to providing an air outlet on the lower side of the front plate on the downstream side,
A combustion tube is provided that protrudes upward from the bottom plate to approximately the center of the blower and has a combustion section in the lower part of the interior, and the front plate is provided with a radiation window through which the combustion tube can be seen, and the top plate is arranged downward in the downstream direction. tilted to
Further, a catalytic purification filter is disposed on a cross section where the front part of the combustion cylinder top is tilted forward, and the rear part of the combustion cylinder top is constituted by a perforated plate, and the ventilation passage between the top plate and the combustion cylinder top is arranged vertically. The partition plate to be divided is arranged so as to be inclined downward in the downstream direction.

Effect The present invention has the above-described configuration, so that the acoustic impedance when looking at the top of the combustion cylinder from the combustion section is higher in the perforated plate behind the top of the combustion cylinder than in the catalyst purification filter having a passage diagonally with respect to the combustion cylinder. is small, and most of the noise generated in the combustion section is radiated from the perforated plate. The sound radiated from the porous part is reflected upstream by the partition plate at the top, preventing the sound from being reflected many times in the ventilation duct, and causing resonance such as muffled sound and standing waves. can be suppressed. As a result, some frequencies of the combustion sound are not amplified due to resonance, resulting in a gentle noise spectrum that eliminates unpleasant harshness.
It can be turned into a low-noise hot air heater.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the combustion tube 6 is placed over the combustion section 5 installed in the ventilation duct 18, which is composed of the top plate 15, the front plate 16, the bottom plate 3, and the side plates 19. A propeller blower 7 is provided on the upstream side of the cylinder, and an air outlet 8 is provided on the downstream side. The propeller blower heats the room by blowing out hot air that has undergone heat exchange in the combustion tube from the outlet. Moreover, a lattice-like catalyst purification filter 10 for purifying the air after combustion is disposed in a cross section in which the front of the combustion cylinder top is tilted forward, and a radiation window 1 is configured so that the red-hot state of the catalyst purification filter can be seen from the outside.
1, and radiant heat can also be used for heating. Furthermore, the top plate 15 of the air duct is inclined downward toward the downstream side, and the rear part of the top of the combustion tube 6 is constructed with a perforated plate 17, so that the air passage between the combustion tube 6 and the top plate 15 can be vertically moved. Shikiri board to be divided 2
1 was established. This partition plate has an eave plate A22 and an eave plate B23 on the upstream side and the downstream side, respectively, so that air can easily flow through the upper passage 24 of the partition plate.

In such a configuration, when the top of the combustion cylinder is acoustically viewed from the combustion section, the acoustic impedance is smaller in the rear perforated plate 17 than in the inclined passage of the catalyst purification filter 10. Therefore, most of the noise generated in the combustion section is radiated from the perforated plate. The sound emitted from the perforated plate is reflected to the upstream side of the ventilation duct by the partition plate at the top, preventing the sound from being reflected multiple times within the ventilation duct, preventing sound muffledness and standing wave resonance. can be suppressed. As a result, some frequencies of the combustion sound are no longer amplified, resulting in noise with a gentle frequency spectrum. Therefore, the unpleasant harshness is eliminated and the low-noise warm air heater 2
It can be set to 0.

On the other hand, since there are many small holes at the rear of the top of the combustion cylinder, there is a concern that the air after combustion will leak from the small holes and reduce the effectiveness of the catalyst purification filter. Because of the air flow, it acts as an air curtain, and the air inside the combustion cylinder rarely leaks through the small holes.

Further, since a partition plate is provided between the top of the combustion cylinder and the top plate of the air duct, cold air blows downward from between the eaves plate B23 and the front plate 16 through the upper passage. Therefore, the high temperature air and cold air coming out of the catalyst purification filter are mixed well, and moderately warm air can be blown out from the air duct, and the front plate, air outlet, and top plate can be heated to a high temperature. It is safe.

Effects of the Invention As described above, according to the present invention, the combustion sound is emitted from the rear of the top of the combustion cylinder, and the sound is reflected upstream by the partition plate, so that muffled noise and stationary noise in the ventilation duct are avoided. It is possible to suppress the generation of resonance sounds such as waves, reduce unpleasant harshness, and lower the noise level. Moreover, by mixing the cold air flowing from the upper passage in front of the outlet with the high-temperature air coming out of the catalyst purification filter, it is possible to blow air at a moderate temperature from the outlet, and the front plate and outlet It is safe because the top plate and top plate are not heated to high temperatures.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a hot air heater according to an embodiment of the present invention, FIG. 2 is a plan sectional view of the hot air heater, and FIG. 3 is a side sectional view of a conventional hot air heater. FIG. 4 is a partially cutaway front view of a conventional warm air heater. 3...Bottom plate, 5...Combustion section, 6...Combustion tube, 7
...Blower, 8...Air outlet, 10...Catalyst purification filter, 11...Radiation window, 15...Top plate, 16...
...Front plate, 17...Perforated plate, 18...Blower duct,
20... Hot air heater, 21... Partition plate, 22...
...Eave plate A, 23...Eave plate B.

Claims (1)

[Scope of Claims] 1. A blower duct consisting of a top plate, a bottom plate, side plates, and a front plate, a blower provided on the upstream side of the blower duct, and an air outlet provided on the lower side of the front plate on the downstream side. , a combustion tube is provided that protrudes upward from the bottom plate to approximately the center of the blower and has a combustion section in the lower part of the interior; a radiation window through which the combustion tube can be seen is disposed on the front plate; and the top plate is arranged in a downstream direction. A catalyst purification filter is disposed on a cross section in which the top of the combustion cylinder is tilted downward and the front of the top of the combustion cylinder is tilted forward. A hot air heater that has a partition plate that divides the ventilation passage into upper and lower parts, tilted downward in the downstream direction. 2. The partition plate has an eave plate that slopes downward from above the most upstream end of the combustion tube toward the upstream side, and an eave plate that slopes downward from above the most downstream end of the combustion tube toward the downstream side. heater.