JPH02157514A - Low noise high load combustion device - Google Patents

Abstract

PURPOSE:To reduce noise by a constitution wherein a groove-type restricting section is provided at one part of a burner body along the lengthwise direction of a frame port, an air permeable flow regulating body is held so as to be contacted with the choking section of a burner case while the downstream side of an air chamber is partitioned to provide a small air chamber. CONSTITUTION:Air, supplied from a fan 9, enters a distributing chamber 12 and most of it is supplied to an air chamber 4 as secondary air while one part of it passes through a damper 11 and is supplied to a primary air chamber 13 as primary air. Fuel, supplied from a fuel supplying pipe 14, is injected from a nozzle 15 with a high pressure and enters into a burner body 3 together with the primary air while uniformly mixed mixture is regulated more uniformly by a restricting section 17. Subsequently, the mixture passes through the flame ports 16 of a frame port unit 7 and flows out into a combustion chamber 23 to form flames. On the other hand, most of secondary air, passed through a porous plate 10, is introduced into the air chamber 4 while keeping the component of bias flow in the blow-off direction of the fan 9 and is supplied to a small air chamber 6 while becoming uniform flow during passing through a holding body 18 and a flow regulating body 5. One part of the most of the secondary air enters into a flame keeping chamber 20 through a communicating port 19 and the pressure thereof is reduced while the flow thereof is regulated, then, flows out with a low speed into a combustion chamber 23 from flame keeping air ports 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to a forced combustion device using a fan, and more particularly to a small-sized combustion device for home use.

Conventional technology In general, combustion devices that accelerate the combustion reaction by jetting and supplying air to the flame, shorten the flame length, and achieve high-load combustion.
If the supplied air is not sufficiently rectified, it will be supplied to the flame in a turbulent state, disturbing the flame zone and increasing combustion noise. Conventionally, in this type of combustion device, as shown in Fig. 4, an air permeable flow regulator 5 is provided on the downstream side of an air chamber (■) surrounded by a burner case (■), an air injection plate (■), and a burner body (■), and a small air chamber (6). It consisted of The fluid regulator 5 was configured to be sandwiched and supported between a part of the flame port 7 and a flame stabilizing plate 8 forming a flame stabilizing chamber. However, in such a configuration, the effective air passage width A of the flow regulator 5 is narrow, the passing flow velocity is high, the flow on the burner body ■ side is subject to large drift, and the passage length to the air injection plate ■ must be increased. Due to the difficulty in constructing the structure, the sufficient rectifying effect of the fluid rectifier 5 could not be utilized. Therefore, there are limits to noise reduction.

Problems to be Solved by the Invention The present invention is intended to solve these conventional problems, and aims to achieve sufficient rectification of combustion air to achieve noise reduction and high-load combustion.

Means for Solving the Problems To achieve this object, the present invention provides a line-shaped burner port having a large number of burner ports, a burner body that connects to the burner port and supplies a mixture, and an outer periphery of the burner body. A burner case that surrounds the burner case and forms part of the air chamber, and a burner case that is in contact with the flame nozzle and is located downstream from the flame nozzle and injects combustion air into the air-fuel mixture that flows out from the flame nozzle into the combustion chamber. Equipped with an air jet plate with multiple air ports, a groove-shaped throttle section is provided along the longitudinal direction of the flame port part of the burner body, and the throttle section and the burner case are in contact to maintain a permeable flow regulation. The downstream side of the air chamber is partitioned off to provide a small air chamber.

Effect: With the above configuration, a part of the flow regulator is supported in the groove along the constricted portion of the burner body. Therefore, the combustion air supplied from the upstream side of the air chamber passes through the rectifier at a low speed without having the passage width between the burner case and the burner body narrowed or being subjected to large drift. In addition, the air is rectified further upstream, and the length of the passage in the small air chamber up to the air jet plate is increased, so that a further effect of rectification can be obtained.

The air-fuel mixture partially flowing inside the burner body has a uniform distribution in the longitudinal direction of the flame port by the throttle section.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same components are given the same numbers. 1 to 3, a fan (2) is connected to the bottom of the burner case (2), and a distribution chamber (12) surrounded by a perforated plate (10) and a damper (11) is provided at the air outlet. Damper 1
A primary air chamber 13 is provided on the downstream side of the primary air chamber 1, into which a fuel supply pipe 14 is inserted with a nozzle 15 attached thereto. Inside the burner case ■, a plurality of burner bodies ■ each equipped with a flame port 7 consisting of a large number of flame ports 16 are lined up, and a plurality of air injection plates ■
are joined to each other. (Not shown) An air chamber (2) is formed on the downstream side of the perforated plate 10. Burna body■
A groove-shaped constriction part 17 is provided in a part of the flame outlet part 7, and is connected to the flame mouth part 7. A rectifying fluid 5 having a large porosity is supported by a porous holder 18 and is held in the air with a portion of the holder 18 entering the constriction part 17.

A small air chamber 6 is formed between the flow regulator 5 and the air jet plate (2). A flame holding chamber 20 is provided with a communication port 19 on the side of the small air chamber 6 and partitioned by a flame holding plate 8 joined to the air injection plate ■.
is provided. An air injection plate (■) equipped with a large number of air ports 21 arranged in a zigzag pattern on an inclined part is connected at one end to the burner case (■), and the other end is inserted into the U-shaped part of the flame port part 7 to form a small air chamber. 6 and the combustion chamber 23. The air jet plate (2), the burner body (2), and the flow regulator 5 are held at both ends in the longitudinal direction by end plates 22. Flame holding chamber 20 and combustion chamber 2
3 communicates with each other through a flame stabilizing air port 24 provided in the air jet plate (3). A heat exchanger 25 is provided downstream of the combustion chamber 23, and an exhaust unit 26 is connected thereto.

To explain the operation of the above configuration, combustion air supplied from fan (2) enters the distribution chamber (12), most of which is supplied to the air chamber (2) as secondary air, and a portion passes through the damper (11) to the primary air. Each of the air is supplied to the primary air chamber 13 as air. The fuel supplied through the fuel supply pipe 14 is transferred to the nozzle 1
It is ejected at high pressure from 5 and enters the burner body ■ along with the primary air. The air-fuel mixture uniformly mixed within the burner body 1 has a substantially uniform supply distribution by the throttle section 17 in the middle, and is further uniformly rectified by a conventionally provided downstream rectifying means. The air-fuel mixture that has passed through the burner body ■ becomes a uniform flow and passes through the flame port 16 of the flame port part 7 into the combustion chamber 2.
3 and forms a flame. On the other hand, most of the secondary air that has passed through the perforated plate 10 is guided to the air chamber (2) while having a biased flow component in the blowing direction of the fan 9. The biased flow is alleviated in the air chamber (2), and while passing through the holder 18 and the regulating fluid 5, the flow becomes completely uniform and is supplied to the small air chamber 6. A further part of it enters the flame holding chamber 20 through the communication port 19 and is depressurized.
After being rectified, it flows out from the flame stabilizing air port 24 into the combustion chamber 23 at a low speed.

This low-velocity combustion air is supplied from both sides of the flame port 7 to firmly hold the base of the flame. Most of the secondary air is blown out from the air port 21 into the combustion chamber 23 toward the flame at high speed. The flame surface is formed along the air ports 21 arranged in a zigzag pattern, and since the combustion reaction surface is enlarged accordingly, the flame length is reduced and high-load combustion is achieved. The high-temperature combustion gas is turned into low-temperature exhaust gas by a heat exchanger 25 located downstream of the combustion chamber 23, and is discharged into the atmosphere from an exhaust unit 26.

Now, as shown in FIG. 3, the flow regulator 5 is held along the groove of the constricted portion 17 of the burner body (2). Therefore, the passage width B of the secondary air becomes larger than the conventional width A, the ventilation flow velocity becomes smaller, and the secondary air is rectified without generating turbulence. In addition, since there are no protrusions in the air passage for supporting the flow regulating fluid 5, local drifts and vortices are not generated. Furthermore, since the flow is rectified on the upstream side compared to the conventional method, the air is ejected into the combustion chamber 23 after being made more uniform. Therefore, the secondary air supplied to the flame is sufficiently rectified, and combustion noise is significantly reduced.

On the other hand, the air-fuel mixture can be roughly adjusted in distribution using the throttle section. For this reason, the air-fuel mixture ejected from the flame port 16 is more thoroughly rectified and made uniform than in the conventional structure without a throttle section, so that combustion performance is improved. Further, since a stable flame is formed throughout the flame port 7, combustion noise can be further reduced.

Effects of the Invention As is clear from the above description, the low-noise, high-load combustion apparatus of the present invention provides the following effects.

1. Since the flow regulation is maintained in the throttle part of the burner body, the width of the passage can be made small, and the air can be rectified by the flow regulation at a low flow rate without generating local drift or vortices, which significantly reduces combustion noise. .

2. Since the constriction part is provided in the burner body, the flow is rectified on the upstream side, and the length of the passage after passing through the flow regulator to the air jet plate is increased, which further improves the rectification and uniformity of the flow.

3. The groove in the constriction part serves as a guide when inserting the fluid regulator, which facilitates assembly and prevents the fluid regulator from shifting after assembly.

4. The throttle part makes the air-fuel mixture more uniform, improving combustion performance.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the overall configuration of a low-noise, high-load combustion device showing an embodiment of the present invention, Fig. 2 is a partially enlarged perspective view showing the main parts, and Fig. 3 is a partial cross-sectional view of Fig. 2. , FIG. 4 is a partial sectional view showing the main parts of the conventional example. ■・・・Burner case, ■・・・Air injection plate, ■・・・Burner body, ■・・・Air chamber, 5・・・Fluid regulator , 6... small air chamber,
7...flame mouth part, 16...flame mouth part, 17.
...Aperture part, 21...Air port, 23...
... Combustion chamber. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] a burner body that is connected to the burner port and supplies a mixture; a burner case that surrounds the outer periphery of the burner body and constitutes a part of the air chamber; an air injection plate having a large number of air ports that are in contact with the flame port and located downstream from the flame port and inject combustion air into the air-fuel mixture flowing out from the flame port into the combustion chamber; A groove-shaped constriction part is provided in a part of the burner body along the longitudinal direction of the burner port, and the constriction part and the burner case are in contact with each other to maintain an air-permeable regulating fluid and to control the downstream side of the air chamber. Low-noise, high-load combustion equipment with small partitioned air chambers.