JP4110991B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus such as a hot water heater for burning a mixed gas of liquid fuel and air.
[0002]
[Prior art]
A hot water heating apparatus which is a conventional combustion apparatus will be described with reference to FIGS. Reference numeral 1 denotes a burner motor, and a fan 3 for sending combustion air is attached to the rotary shaft 2, and the outside thereof is covered with an air supply cover-4 to form a blowing means. A vaporization cylinder 6 in which a heater 5 is embedded is fixed downstream of the blowing means, and a vaporization surface 7 and a vaporization mixing chamber 8 are formed in the vaporization cylinder 6.
[0003]
Reference numeral 9 denotes a nozzle for supplying oil as fuel, which is disposed so as to face the rotor cup 10. The rotor cup is attached to the rotating shaft 2 of the burner motor 1 with a certain distance from the tip of the nozzle 9. Yes. A mixing plate 11 is attached to the tip of the rotating shaft 2. A burner head 12 is fixed to the tip of the vaporizing cylinder 6, and the burner head 12 forms a flame port 12A for ejecting fuel vaporized gas.
[0004]
Reference numeral 13 denotes a cylindrical heat exchanger having fins 13A on the inner side thereof, the lower end portion being fixed to the shelter 14, and the copper pipe 15 constituting the hot water circulation circuit being wound around the outer periphery. A baffle pipe 16 having a cylindrical shape is provided inside the heat exchanger 13 so as to form an exhaust gas passage 17 between the fin 13A. Further, the baffle pipe 16 is provided with a plurality of bent pieces 16A obliquely upward at the upper end opening edge, and an opening 16B communicating with the exhaust gas passage 17 is formed between the bent pieces 16A. Further, a resilient annular heat exchange packing 18 is placed on the upper end of the heat exchanger 13 while avoiding the upper portion of the exhaust gas passage 17, and the end of the bent piece 16 </ b> A of the baffle pipe 16 is placed on the heat exchange packing 18. The part is placed and pressed from above with a fixed heat exchanger lid 19.
[0005]
A baffle body 20 shields the central space of the baffle pipe 16 so that the combustion gas is directed to the exhaust gas passage 17. An ignition means 21 starts high-pressure discharge between the tip of the burner head 12 and combustion in the burner head 12. In the figure, 19 A is an opening as an exhaust port provided in the center of the heat exchanger lid 19.
[0006]
The operation of the combustion apparatus configured as described above will be described. The heater 5 embedded in the vaporizing cylinder 6 is energized to heat the vaporizing cylinder 6, and at the same time the vaporizing cylinder 6 reaches a certain temperature, the burner motor 1 starts, and combustion air is sent from the fan 3 to the vaporizing and mixing chamber 8.
[0007]
Further, the fuel discharged from the tip of the nozzle 9 is spun off by the rotating rotor cup 10 and the mixing plate 11 and atomized, and the atomized fuel hits the vaporizing surface 7 of the vaporizing cylinder 6 and is vaporized. The vaporized fuel is mixed with combustion air to form a premixed gas, is ejected from the flame port 12A of the burner head 12, is ignited by high pressure discharge by the ignition means 21, and a flame 22 is formed. Combustion continues by supplying liquid fuel continuously.
[0008]
Then, the combustion gas passes through the exhaust gas passage 17 between the baffle pipe 16 and the fin 13A of the heat exchanger 13 as indicated by an arrow, and between the bent pieces 16A of the baffle pipe 16 inside the heat exchange packing 18. It passes through the opening 16B, passes through the opening 19A of the heat exchanger lid 19 and is discharged to the outside. The combustion heat at this time is transmitted from the fins 13A of the heat exchanger 13 to the copper pipe 15 of the hot water circulation circuit to increase the hot water temperature, thereby constituting a hot water heater.
[0009]
However, in such a configuration of the combustion apparatus, the pressure fluctuation generated on the flame 22 surface of the burner head 12 during combustion becomes a pressure wave and proceeds toward the upstream side of the burner head 12, that is, toward the air supply side. And a pressure wave collides with the wall of the air supply cover 4, this surface becomes a closed end, and a pressure wave reflects. This reflected pressure wave again affects the flame and causes a new pressure fluctuation.
[0010]
On the other hand, the pressure wave generated on the surface of the flame 22 also travels downstream of the burner head 12, that is, in the axial direction of the heat exchanger 13. And a pressure wave collides with the wall of the heat exchanger lid 19, this surface becomes a closed end, and a pressure wave reflects. This reflected pressure wave again affects the flame and causes a new pressure fluctuation.
[0011]
The bent piece 16A provided at the upper end opening edge of the conventional baffle pipe 16 is bent in an obliquely upward shape, placed on the elastic heat exchange upper packing 18, and further fixed while being pressed by the heat exchange lid 19. As a result, it is fixed halfway with a part of the bent piece 16A supported by the elastic heat exchanging packing 18, and the entire baffle pipe 16 vibrates due to the above cause, and noise and vibration are generated from the instrument. was there.
[0012]
Further, the tip of the bent piece 16A of the baffle pipe 16 is in contact with the back surface of the heat exchanger lid 19, and the vibration of the baffle pipe 16 is transmitted to the heat exchanger lid 19 and a resonance sound may be generated.
[0013]
Furthermore, since the baffle body 20 has a flat plate shape, the baffle body 20 vibrates from here and is amplified to generate noise and vibration.
[0014]
Therefore, pressure fluctuation feedback due to pressure waves with a frequency that matches the acoustic characteristics of the combustion device is applied, and vibration combustion is generated that is amplified and causes vibration combustion, and also occurs in association with combustion conditions, etc. Therefore, there was a problem that noise and vibration were generated.
[0015]
[Problems to be solved by the invention]
In view of the above-described problems of the conventional technology, the problem to be solved by the present invention is to provide a combustion device that can further reduce noise and vibration generated from the combustion device as compared with the conventional technology.
[0016]
[Means for Solving the Problems]
In order to solve the above problems, a combustion apparatus of the present invention includes a vaporizing cylinder that vaporizes liquid fuel and mixes it with combustion air, a burner head that burns a mixed gas supplied from the vaporizing cylinder, and a downstream of the burner head. A cylindrical heat exchanger having fins on the inside, a baffle pipe which is provided inside the heat exchanger and forms an exhaust gas passage between the heat exchanger, and the inside of the baffle pipe is shielded A baffle body, wherein the baffle pipe has a plurality of bent pieces placed on the heat exchanger, and the upper portion of the exhaust gas passage on the bent pieces and on the heat exchanger. This is a combustion device in which a rigid seal packing is placed and the seal packing is fixed from above with a heat exchanger lid.
[0017]
According to the above means, a plurality of bent pieces provided on the upper part of the baffle pipe are placed on the upper part of the heat exchanger, and a rigid seal packing is placed on the bent pieces and on the upper part of the heat exchanger, and the exhaust gas passage. Since the heat exchanger lid is placed and fixed and sealed on top of it, the entire baffle pipe is prevented from vibrating and vibration is transmitted from the baffle pipe to the heat exchanger lid. The generation of resonance noise can be prevented, and the sound absorption effect can be achieved by having a part of the packing face the exhaust gas passage.
[0018]
Therefore, even if pressure fluctuation feedback due to a pressure wave with a frequency that matches the acoustic characteristics of the combustion device is applied and amplified to cause vibration combustion, the noise and vibration generated by the instrument will be reduced. It is possible to provide a combustion apparatus that can be further reduced as compared with the above.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Since the object of the present invention described above can be achieved by implementing the configuration described in each claim as an embodiment, the configuration of each claim and the function and effect of the configuration are also described below, together with the claim. The specific terms that need to be explained in the configuration will be described in detail by adding a detailed explanation.
[0020]
According to a first aspect of the present invention, there is provided a vaporizing cylinder for vaporizing and mixing liquid fuel with combustion air, a burner head for burning a mixed gas supplied from the vaporizing cylinder, a downstream side of the burner head, A heat exchanger having fins, a baffle pipe that is provided inside the heat exchanger and forms an exhaust gas passage between the heat exchanger, and a baffle body that shields the baffle pipe are provided. A plurality of folded pieces are placed on the top of the heat exchanger, and a rigid seal packing is placed on the folded pieces and on the top of the heat exchanger so as to face the exhaust gas passage, and a heat exchanger lid is placed on the seal packing. It is configured to be mounted and fixed and sealed.
[0021]
According to the above embodiment, the bent piece of the baffle pipe is placed on the upper part of the heat exchanger and further fixed from above with a heat exchanger lid through a rigid seal packing, so that the entire baffle pipe vibrates. In addition, vibration transmission from the baffle pipe to the heat exchanger lid is also prevented, and the sound absorption effect can be enhanced by placing the rigid seal packing on the bent piece facing the exhaust gas passage. it can.
[0022]
Therefore, even if pressure fluctuation feedback due to a pressure wave with a frequency that matches the acoustic characteristics of the combustion device is applied and amplified to cause vibration combustion, the noise and vibration generated by the instrument will be reduced. It is possible to provide a combustion apparatus that can be further reduced as compared with the above.
[0023]
The invention according to claim 2 is the combustion apparatus according to claim 1, wherein the baffle pipe has a cylindrical shape, the baffle body is a rigid body, and a plurality of reinforcing beads are provided. .
[0024]
According to the above embodiment, it is possible to prevent the baffle body from vibrating, and it is possible to prevent vibration combustion and resonance sound generated by amplification of this vibration.
[0025]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0026]
(Example 1)
FIG. 1 is a cross-sectional view of a combustion apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the apparatus. In the present embodiment, parts having the same configuration and operational effects as those of the prior art are denoted by the same reference numerals, detailed description thereof is omitted, and different parts are mainly described.
[0027]
1 and 2, reference numeral 23 denotes a cylindrical baffle pipe, which has a plurality of bent pieces 23 </ b> A bent at a substantially right angle and a plurality of openings 23 </ b> B formed by the bent pieces 23 </ b> A. A bent piece 23 </ b> A is placed on the upper end of each of the two, and an opening 23 </ b> B communicates with the exhaust gas passage 17. 24 is a rigid seal packing which covers the bent piece 23A of the baffle pipe 23 from above, and is placed on the upper end of the heat exchanger 13 with the inner peripheral part facing the upper part of the exhaust gas passage 17, The heat exchanger lid 19 is placed and fixed thereon, and the bent piece 23A of the baffle pipe 23 is fixed and sealed. A disk-shaped baffle body 25 is provided with a plurality of beads 25 </ b> A on the circumference to reinforce the whole, and an outer peripheral edge is fixed to the baffle pipe 23.
[0028]
The combustion apparatus configured as described above will be described. First, the generation mechanism of the pressure fluctuation in the instrument accompanying operation and combustion is as described in the conventional example.
[0029]
As described above, according to the present invention, as a configuration for reducing the influence of pressure fluctuations generated due to combustion, a plurality of bent pieces 23A provided at the upper end portion of the baffle pipe 23 are bent at substantially right angles, and the upper end of the heat exchanger 13 is Since the part and the rigid seal packing 24 are sandwiched and firmly fixed, it is possible to prevent the entire baffle pipe 23 from vibrating even if a pressure wave generated by combustion is amplified and a large pressure fluctuation occurs. In addition, transmission of vibration from the baffle pipe 23 to the heat exchanger lid 19 can be prevented, and occurrence of abnormal sounds such as resonance sounds can be prevented.
[0030]
Further, since the inner peripheral portion of the seal packing 24 faces the upper portion of the exhaust gas passage 17, the combustion gas hits the inner peripheral portion of the seal packing 24 as indicated by an arrow, and the upper opening of the baffle pipe 23 is opened. 23B is discharged and no longer passes upward as it is in the prior art and does not collide with the heat exchanger lid 19, so that the sound absorption effect of combustion by the seal packing 24 is enhanced.
[0031]
Further, since the baffle body 25 is provided with a bead 25A to reinforce the whole, vibrations from this portion can be suppressed and occurrence of abnormal sounds such as resonance sounds can be prevented.
[0032]
Therefore, the pressure fluctuation feedback due to the pressure wave of the frequency that matches the acoustic characteristics of the combustion device is applied, and even if it is amplified and causes vibration combustion, the noise and vibration generated from the appliance are compared with the conventional one. Therefore, it is possible to provide a combustion apparatus that can be further reduced.
[0033]
In the above-described embodiment, the inner peripheral portion of the seal packing 24 faces the entire upper portion of the exhaust gas passage 17, but it may be part of it for the purpose of the present invention. Moreover, in the said Example, although the bead 25A of the baffle body 25 was provided in the circumferential direction, as long as the reinforcement of the baffle bodies 25, such as radial form, is made, another structure may be sufficient.
[0034]
【The invention's effect】
As described above, the present invention suppresses the vibration of the component parts and enhances the sound absorption effect even if the pressure fluctuation feedback due to the combustion is applied and amplified to cause the occurrence of vibration combustion. Thus, it is possible to provide a combustion apparatus that can further reduce noise and vibration generated from the conventional apparatus.
[Brief description of the drawings]
1 is a cross-sectional view of a combustion apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the combustion apparatus. FIG. 3 is a cross-sectional view of a conventional combustion apparatus. Enlarged cross section [Explanation of symbols]
6 Vaporization cylinder 12 Burner head 13 Heat exchanger 17 Exhaust gas passage 19 Heat exchange lid 23 Baffle pipe 25 Baffle body 24 Seal packing 25A Bead

Claims (2)

A vaporizing cylinder that vaporizes liquid fuel and mixes it with combustion air, a burner head that burns the mixed gas supplied from the vaporizing cylinder, and a cylindrical heat that is provided downstream of the burner head and has fins inside An exchanger, a baffle pipe that is provided inside the heat exchanger and that forms an exhaust gas passage between the heat exchanger, and a baffle body that shields the inside of the baffle pipe, and the baffle pipe is provided at an upper portion. A plurality of bent pieces are placed on the upper part of the heat exchanger, and a rigid seal packing facing the upper part of the exhaust gas passage is placed on the bent pieces and on the upper part of the heat exchanger. A combustion apparatus in which the seal packing is fixed from above with a lid. 2. The combustion apparatus according to claim 1, wherein the baffle pipe has a cylindrical shape, the baffle body in the baffle pipe is a rigid body, and is provided with a plurality of reinforcing beads.

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