JPS62125258A - Warm air flow type space heating unit - Google Patents

Abstract

PURPOSE:To prevent a standing wave resonance from being generated and to reduce a noise level by downwardly inclining a ceiling plate and a partition plate of a supply duct toward the downstream and providing a catalyst purifying filter so that an acoustic focus is set substantially at the center of a heat resisting sound absorption plate stuck to the partition plate. CONSTITUTION:Between a ceiling plate 14 and the top portion of a combustion cylinder, a partion plate 21 stuck on the side of the combustion cylinder 19 with a heat resisting sound absorption plate 25, for dividing a supply passage into two parts, is provided, and the ceiling plate 14 and the partition plate 21 are inclined downward toward the downstream direction. Further, a catalyst purifying filter 22 having an acoustic lens structure provided with an air passage 23 in which the acoustic focus thereof is set substantially at the center of the heat-resisting sound absorption plate 25, is provided on a section 24 formed by cutting the outlet side of the combustion cylinder 19 in a slant section with respect to the central axis of the combustion cylinder 19. By the above construction, a noise generated at a combustion part 18 is radiated from the catalyst purifying filter 22 to the direction of the ceiling plate 14 and the partition plate 21, and the noise is reflected to the upstream side on the ceiling plate 14 and is absorbed by the heat-resisting sound absorbing plate 25 at the pertition plate 21. As a result, it is possible to remove the filling of sound and to prevent the generation of the standing wave to reduce the noise.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a means for reducing the noise of a hot air heater that heats the inside of a heater using a combustion section of kerosene or the like.

BACKGROUND ART As a conventional example, a method used in an oil-burning heater will be explained.

This type of hot air heater had a configuration as shown in FIG. That is, a combustion tube 6 is placed over a combustion section 5 installed in a ventilation duct 13 consisting of a top plate 1, a front plate 2, a bottom plate 3, and side plates (not shown), and a propeller blower is installed on the upstream side of the combustion tube. 7 is installed, and by blowing air into the air duct with this propeller blower, warm air that has undergone heat exchange in the combustion tube is discharged from the blowout port 8. In addition, a catalyst purification filter 10 on a lattice for purifying the air after combustion is disposed on the combustion cylinder top 9 on a forward inclined surface of the combustion cylinder top.
The front plate of the ventilation duct is designed to suppress odors during ignition and extinguishing, and to allow the red heat of the catalyst purification filter to be seen from the outside.
A radiation window 11 was arranged. 12 is a fan guard, and 4 is an oil-burning heater.

Problems to be Solved by the Invention In this configuration, the sound generated in the combustion section is radiated into the ventilation duct through the catalyst purification filter at the top of the combustion cylinder. Furthermore, since the air passages of the catalyst purification filter are opened in a direction perpendicular to the surface of the catalyst purification filter, there is a problem in that the sound generated in the combustion section is easily radiated toward the front plate and becomes muffled. . Moreover, since each side of the air duct is installed parallel to each other, the radiated sound is reflected many times on each side of the air duct, and the radiated sound is reflected at a wavelength that matches the distance between the top plate and the bottom plate. The sound caused standing wave resonance, generating unpleasant noise and increasing the noise level.

The present invention solves such conventional problems by slanting the ceiling plate of the air duct and the partition plate provided inside the air duct downward toward the downstream side, and attaching the heat-resistant and sound-absorbing side of the partition plate to the combustion cylinder side. By attaching a plate and configuring a catalytic purification filter equipped with an air passage whose acoustic focus is approximately at the center of the heat-resistant sound-absorbing plate in a cross section with the front of the top of the combustion cylinder tilted forward, the noise generated from the combustion section can be reduced. The heat-resistant sound-absorbing board absorbs the sound, and the slanted top plate and partition plate prevent the generation of standing waves between them and the bottom plate, suppressing the muffled sound in the ventilation duct, and preventing the generation of standing wave resonance. The purpose is to reduce noise levels.

Means for Solving the Problems In order to solve the above problems, the present invention provides an air outlet on the front plate side, which is the downstream side of the ventilation duct, which is composed of a top plate, a bottom plate, both side plates, and a front plate. A blower is provided on the upstream side, a radiation window is provided on the front plate through which the inside of the blower duct can be seen, the top plate is tilted downward in the downstream direction, and the inside of the blower duct is provided from the bottom plate to approximately the center of the blower. A combustion tube that protrudes upward and has a combustion section at the bottom inside thereof is provided, a partition plate that divides the ventilation passage between the top plate and the combustion tube into upper and lower parts is provided and inclined downward in the downstream direction, and the partition plate is provided so as to be inclined downward in the downstream direction. A heat-resistant sound-absorbing plate is attached to the side of the combustion cylinder, and a catalytic purification filter having a friendly acoustic lens structure is provided on the cross section of the top of the combustion cylinder that is tilted forward. The structure was designed as follows.

Function: Due to the above-described configuration, the F3A of the present invention emits noise generated in the combustion section from the catalyst purification filter toward the tilted top plate and partition plate, is reflected toward the upstream side by the top plate, and is reflected toward the partition plate. Since the sound is absorbed by the heat-resistant sound-absorbing board, the sound is not muffled, and the generation of standing waves can be prevented, thereby reducing noise. In addition, the heat-resistant sound-absorbing board also has a heat insulating effect, suppressing the temperature rise of the top plate of the ventilation duct due to the heat of the combustion section, and improving safety.

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

As shown in FIG. 1, the configuration of the ventilation duct includes a combustion section 18 and a combustion tube 19 installed in the ventilation duct 17, which is composed of a top plate 14, a front plate 15, a bottom plate 16, and side plates (not shown). A propeller blower 7 is installed on the upstream side of the combustion tube. Then, by blowing air into the air duct with a propeller blower, warm air that has undergone heat exchange in the combustion tube is discharged from the Suita port 20. Also,
A partition plate 21 that divides the ventilation passage into two is provided between the top plate and the top of the burn-removal plate by pasting a heat-resistant sound-absorbing plate 25 on the combustion cylinder side. It was configured to tilt downward. Further, a catalytic purification filter having an acoustic lens structure is provided with an air passage 23 whose acoustic focus is approximately at the center of the heat-resistant sound absorbing plate 25 in a cross section 24 obtained by cutting the outlet side of the combustion tube 19 into a section oblique to the central axis of the combustion tube. 22. 26 is an oil combustion heater.

With this configuration, the noise generated in the combustion section is radiated from the catalyst purification filter toward the top plate and the In direction, is reflected toward the upstream side by the top plate, and is absorbed by the heat-resistant sound-absorbing plate at the bottom plate. Ru. As a result, sound is not muffled, standing waves can be prevented from being generated, and noise can be reduced.

Further, since the catalyst purification filter has an acoustic lens structure, the radiation direction of sound can be concentrated, and the area of the heat-resistant sound-absorbing plate can be reduced. Therefore, a sufficient sound absorption effect can be obtained even when attached to a small board such as a finishing board.

In addition, the heat-resistant sound-absorbing board also has a heat insulating effect, suppressing the temperature rise of the top plate of the ventilation duct due to the heat of the combustion section, and improving safety.

Effects of the Invention As described above, according to the present invention, the noise generated in the combustion section is reflected upstream by the top plate and absorbed by the heat-resistant sound-absorbing plate of the partition plate, so that the muffled sound is eliminated.
It is possible to prevent the generation of standing wave sound and reduce noise. Furthermore, the heat-insulating effect of the heat-resistant sound-absorbing plate can suppress the temperature rise of the air duct top plate due to the heat of the combustion section, thereby improving safety.

[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 perspective view of the catalyst purification filter of the hot air heater, and FIG. 3 is a side sectional view of the conventional hot air heater. 7...Blower, 11...Radiation window, 14...
Group/Top plate, 15...Front plate, 16...Bottom plate,
17...Blower duct, 18...Combustion section, 19...Combustion section, 20...Blower outlet, 21
...Binding plate, 22 ... Catalyst purification filter, 23 ... Air passage, 25 ... Heat-resistant sound absorption board. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3

Claims (1)

[Claims] An air outlet is provided on the front plate side which is the downstream side of the air duct which is composed of a top plate, a bottom plate, side plates and a front plate, a blower is provided on the upstream side, and a radiation window is provided on the front plate through which the inside of the air duct can be seen. , the top plate is inclined downward in the downstream direction, and a combustion cylinder is provided inside the blower duct 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 inside, and the top plate and the A partition plate that divides the ventilation passage between the combustion tube into upper and lower parts is installed so as to be inclined downward in the downstream direction.
Attaching a heat-resistant sound-absorbing plate to the combustion cylinder side of the partition plate,
A hot air heater in which a catalytic purification filter having an acoustic lens structure is installed in a cross section in which the front of the top of the combustion cylinder is tilted forward, and the air passage has an acoustic focal point approximately at the center of the sound absorbing plate.