JPH04295508A - Burning appliance - Google Patents

Abstract

PURPOSE:To stabilize the combustion of a burner and improve the combustion characteristics and at the same time reduce the noises. CONSTITUTION:The subject device is provided with a heat exchanger 5, the combustion chamber 9 provided in this heat exchanger 5, a burner 7 that carries out combustion in this combustion chamber 9, and a blower 8 that supplies the combustion air to this burner 7. And the burner 7 and blower 8 are connected through a bent blast channel X, and at the bent section of the blast channel X a flow straightening plate 53 is provided which makes the flow of the combustion air substantially uniform.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion equipment such as oil water heaters and oil hot water boilers.

0002

BACKGROUND OF THE INVENTION Conventional combustion equipment of this type includes, for example, the combustion section of a gun-type burner connected to a combustion chamber provided in a heat exchanger, as disclosed in Japanese Utility Model Application No. 58-169342. The burner and the blower that supplies combustion air to the burner are positioned at approximately right angles to the center line of the burner.
In addition, a device is known in which the blower is brought as close to the heat exchanger as possible by communicating through an upwardly curved air passage, thereby reducing the size of the device.

0003

[Problems to be Solved by the Invention] However, in the conventional combustion equipment described above, since the ventilation passage is bent, the flow of combustion air supplied to the burner is weak on the inside of the bend and weak on the outside. The closer you get, the stronger you become. This uneven flow of combustion air causes problems such as unstable combustion in the burner, increased soot and carbon monoxide, and increased combustion noise.

The present invention has been made in view of the above-mentioned facts, and provides stabilization of combustion in the burner by providing a rectifying plate at the bent portion of the ventilation passage to make the flow of combustion air in the burner substantially uniform. The aim is to improve combustion characteristics and reduce noise.

[0005]

[Means for Solving the Problems] The present invention provides a heat exchanger,
The heat exchanger includes a combustion chamber provided in the heat exchanger, a burner that performs combustion in the combustion chamber, and a blower that supplies combustion air to the burner. At the same time, a rectifier plate is provided at the bent portion of the ventilation passage to make the flow of combustion air within the burner substantially uniform.

[0006]

[Function] In this way, the burner and the blower are connected through the bent air passage, so the blower can be brought as close to the heat exchanger as possible, making the equipment more compact and reducing the air passage. The bent part is equipped with a rectifying plate that makes the flow of combustion air within the burner approximately uniform, which stabilizes the combustion of the burner and reduces combustion noise caused by flame turbulence. Silence can be achieved even in ventilation passages.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the combustion equipment of the present invention is applied to an oil water heater will be described below with reference to the drawings of FIGS. 1 to 3. In FIGS. 1 and 2, reference numeral 1 denotes an exterior case consisting of a substrate 2, a circumferential side plate 3, and a top plate 4. Inside this exterior case 1, there is a can body 5 as a heat exchanger, and an upper part of this can body 5. A connected silencer 6, a burner 7 made of a gun type burner, and a blower 8 for supplying combustion air to the burner 7 are housed.

The can body 5 includes an inner shell 10 having a combustion chamber 9 formed therein, an outer shell 11, a top plate 12, a bottom plate 13, and a plurality of smoke pipes 14, 14 each having a baffle B inserted therein. Also, between the inner shell 10 and the outer shell 11 and above the inner shell 10 is a water chamber 16 to which tap water is supplied from a water supply pipe 15.
Further, the hot water in the water chamber 16 is supplied to the usage section via the hot water outlet pipe 17.

The high temperature exhaust gas burned in the combustion chamber 9 passes through the smoke pipe 14 and enters the water chamber 16 as shown in FIG.
After that, it passes through the silencer 6 and is discharged to the outside of the exterior case 1 from the exhaust connection pipe 18. Also,
Since the exhaust device 19 is fitted into the exhaust connection pipe 18, the exhaust gas is discharged from the exhaust device 19 into the atmosphere.

A burner insertion tube 20 is provided on the wall surfaces of the inner shell 10 and outer shell 11 located in the combustion chamber 9, and the burner 7 is inserted into the burner insertion tube 20. Also,
As shown in FIG. 1, this burner 7 includes a cylindrical burner tube 22 with a ring-shaped mounting plate 21 attached to one end, a fuel spray nozzle 23 located inside this burner tube 22, and a fuel spray nozzle 23 located inside this burner tube 22. A stabilizer 24 provided in front of the stabilizer 24 , a combustion tube 25 provided in front of the stabilizer 24 , a spark plug 27 held by a fixture 26 that fixes the nozzle 23 , and a fuel supply pipe 28 that connects the nozzle 21 to the nozzle 21 . A fuel pump that pumps liquid fuel such as kerosene (
(not shown).

The blower 8 includes a motor 29 and a plurality of blower fans 3 attached to a rotating shaft 30 of the motor 29.
1 and 31 and a casing 32. The motor 29 is held on one side of the casing 32 on the can body 5 side, and an air suction port 34 whose opening degree is adjusted by an air amount adjusting damper 33 is provided on the other side of the casing 32. There is.

[0012] Also, the burner tube 22 of the burner 7
and the casing 32 of the blower 8 are connected via a blow passage X that is approximately perpendicular to the center line of the burner tube 22 and bent upward or diagonally upward, A rectifier plate 35 is provided at the bent portion of the
is provided.

[0013] The rectifying plate 35 has a diameter of about 6 to 10 mm.
It is made of a punching plate having a large number of pores 36, 36... and having an aperture ratio of about 40 to 60%, and is slanted so that the upper side approaches the nozzle 23, as shown in FIG. It has a surface 35A, and is fixed to either one of the first communication duct 37 and the second communication duct 38 that constitute the ventilation passage X.

FIG. 3 is a flow distribution diagram showing the flow of combustion air downstream of the baffle plate 35 described above.

In the above configuration, first, the opening degree of the air suction port 33 is adjusted using the air amount adjusting damper 34 depending on the installation area, altitude, and configuration of the exhaust system. At startup, the blower fans 31, 31 are rotated by energizing the motor 29, and the blower 8 is activated. With the operation of the blower 8, combustion air enters the casing 32 from the air suction port 36, the air that enters the casing 32 is pressurized by the blower fan 31, and passes through the air passage X to the burner tube 22. Supplied. Thereafter, the spark plug 27 is energized, and after a certain period of time, the fuel pump (not shown) is activated to direct the nozzle 23 into the combustion chamber 9.
Fuel is injected into the combustion chamber 9, and combustion occurs in the combustion chamber 9.

According to this embodiment, the burner 7 that performs combustion in the combustion chamber 9 and the blower 8 that supplies combustion air to the burner 7 are bent approximately at right angles to the center line of the burner tube 22. Since they are in communication via the passage The blower 8 can be installed in a narrow space inside the outer case 1.

[0017] Furthermore, the bent portion of the air passage X that communicates the burner 7 and the air blower 8 has a large number of pores 36, 36 with a diameter of about 6 to 10 mm, and the aperture ratio thereof is set to about 40 to 60%. In addition, by providing a rectifying plate 34 having an inclined surface 34A whose upper side approaches the nozzle 23,
As shown in FIG. 3, since the flow of combustion air within the burner tube 22 is substantially uniform, the combustion air flows out evenly from the entire circumference of the stabilizer 24, and the combustion air is uniformly supplied to the ejected fuel. Therefore, the air and fuel are mixed well, resulting in extremely stable combustion conditions, reducing the amount of soot and carbon monoxide generated, and improving combustion characteristics, as well as creating a stable flame with less turbulence. Even if the ventilation passage X is curved, the generation of combustion noise is suppressed.
A low-noise kerosene water heater can be realized.

Furthermore, in the above embodiment, since the motor 29 of the blower 8 is arranged on one side of the casing 32 on the can body 5 side, this casing 32 serves as a soundproof wall.
The driving noise of the motor 29 can be suppressed from leaking to the outside of the exterior case 1.

FIGS. 4 and 5 show another embodiment of the can body 5, in which the lower portions of a plurality of smoke pipes 14, 14 are bent at appropriate locations so that the upper portions thereof expand outward, as shown in the figures. The other structure is the same as that of the above-mentioned embodiment.

In the other embodiments described above, the smoke pipe 14,
As shown in FIG. 5, by bending the lower part of the smoke pipe 14 at the appropriate place, the flow of combustion exhaust gas (A) and (A) passing through the smoke pipe 14 is disturbed, and the combustion sound (sound wave) is caused by the inclination or curvature of the bent part Y of the smoke pipe 14. Since it is absorbed by the wall surface and converted into heat energy, combustion noise is reduced and quietness can be promoted. Also, by forming the bent part Y, the heat conduction area of the smoke pipe 14 is increased, so that heat exchange is possible. This increases efficiency.

[0021]

[Effects of the Invention] Since the present invention is constructed as described above, the blower can be brought as close as possible to the heat exchanger, and the equipment can be downsized. A rectifying plate is installed at the bent part of the burner to allow combustion air to be supplied to the burner almost uniformly, resulting in stable combustion and improved combustion characteristics, while preventing flame turbulence and reducing combustion noise. Even if it has a ventilation passage, it is possible to provide a combustion device that burns well and is quiet.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of an oil water heater showing an embodiment of a combustion device according to the present invention.

FIG. 2 is a partially cutaway side view showing the overall configuration of the oil water heater.

FIG. 3 is a flow distribution diagram showing the flow of combustion air downstream of the baffle plate.

FIG. 4 is a cutaway side view of essential parts showing another embodiment of the combustion equipment according to the present invention.

FIG. 5 is an explanatory diagram illustrating the operation in another embodiment.

[Explanation of symbols]

5 Can body (heat exchanger) 7 Burner 8　Blower 9 Combustion chamber 35 rectifier plate X Ventilation passage

Claims (1)

[Claims] Claim 1: A heat exchanger, a combustion chamber provided in the heat exchanger, a burner that performs combustion in the combustion chamber, and a blower that supplies combustion air to the burner, the burner and the blower being connected together. The combustion equipment is characterized in that communication is made through a bent air passage, and a rectifying plate is provided at the bent portion of the air passage to substantially uniform the flow of combustion air within the burner.