JPH01302007A - High load combustion equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

BACKGROUND OF THE INVENTION Conventionally, in this type of combustion apparatus, as shown in FIG. 5, the downstream side of an air chamber 4 surrounded by a burner case 1, an air injection plate 2, and a burner body 3 was formed into a wedge shape. Further, the air ports 5 were provided up to the downstream side of the air jet plate 2. In such a configuration, combustion air supplied from the upstream side of the air chamber 4 is gradually injected into the combustion chamber 6 from the air port 5 on the upstream side. In general, the lower the injection velocity, the lower the combustion noise, and therefore the smaller the differential pressure between the air chamber 4 and the combustion chamber 6.

Therefore, the combustion air ejected from the air port 5 on the downstream side is
Under the influence of the flow within the air chamber 4, the air was not ejected in a direction perpendicular to the inclined surface 7, but tended to flow along the wall surface of the combustion chamber as shown in FIG.

Furthermore, due to constraints on the bending process of the static injection plate 2, a part of the air port 5 provided on the downstream side of the wedge-shaped air chamber 4 is included in the bending process, and similarly, the air port 5 located on the downstream side of the wedge-shaped air chamber 4 is included in the bending process. It was easy to flow. Therefore, among the flame surfaces that are continuously formed in a zigzag shape along the air port 6, the unstable flame surface A that is formed at the farthest position from the flame port 8 is fanned from the upstream side. This caused noise and poor combustion.

Also, because the flame surface was close to the combustion chamber wall, it was easy to get hot.

Problems to be Solved by the Invention The present invention is intended to solve such conventional problems, and aims to stabilize flame, reduce noise, and improve combustion performance.

Means for Solving the Problems In order to achieve this object, the present invention provides a burner body including a burner port having a large number of burner ports, and a burner case that surrounds the outer periphery of the burner body and constitutes a part of an air chamber. , a large number of air ports are provided on an inclined surface in a zigzag pattern around the flame nozzle, which are located on the downstream side of the flame nozzle and blow out combustion air at an angle toward the fuel flowing out from the flame nozzle into the combustion chamber. The air injection plate is connected to the burner case and burner body to partition the combustion chamber and the air chamber, and provides a stagnation space on the downstream side of the air port. As an example, the stagnation space is provided by partially protruding a part of the burner case to the side opposite to the flame opening.

Operation With the above configuration, the flow of the combustion air supplied from the upstream side of the air chamber is temporarily stopped in the stagnation space located on the downstream side of the inclined surface. As a result, even if the flow velocity is low, the combustion air ejected from the air port provided on the downstream side of the inclined surface is ejected almost perpendicularly to the inclined surface. That is, among the continuous flame surfaces, it is possible to blow out the combustion air in substantially the same direction from the flame port to the downstream side of the inclined surface, which is farthest and tends to become unstable. Therefore, if the flame is fanned or locally unstable, the downstream flame front will be deflected toward the center of the combustion chamber.

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 9 is connected to the bottom of the burner case 1, and a fuel supply pipe 10 is inserted therein. Inside the burner case 1, there is a flame port part 8 consisting of a large number of flame ports.
A plurality of burner bodies 3 equipped with the above are lined up, and are mutually joined to a plurality of air injection plates 2 to partition a combustion chamber 6 and an air chamber 4.

A flame stabilizing chamber 13 partitioned off by a flame stabilizing plate 12 having a communication port 11 is provided on the air chamber 4 side of the air jet plate 2 . The flame stabilizing chamber 13 and the combustion chamber 6 communicate through a flame stabilizing air port 15 provided in the air injection plate 2.

A large number of air ports 6 are arranged in a zigzag pattern on the inclined surface 7 of the air injection plate 2. The air injection plate 2 on the downstream side of the air port 5 is bent so as to surround a stagnation space 14 provided by locally protruding a part of the burner case 1. A heat exchanger 16 is provided downstream of the combustion chamber 6, and an exhaust unit 17 is connected thereto.

To explain the operation of the above structure, a part of the combustion air supplied from the fan 9 enters the burner body 3 together with the fuel spewed out from the fuel supply pipe 10. burna body 3
The air-fuel mixture uniformly mixed inside flows out into the combustion chamber 6 through the flame port of the flame port part 8 and forms a flame. On the other hand, most of the combustion air is guided into the air chamber 4. A further part of the air enters the flame stabilizing chamber 13 through the communication port 11, is depressurized and rectified, and then flows out from the flame stabilizing air port 15 into the combustion chamber 6 at a low speed. This low-velocity combustion air is supplied from both sides of the flame opening to firmly hold the base of the flame. Most of the combustion air is blown out from the air port 5 into the combustion chamber 6 toward the flame at high speed. The flame surface is formed along the air ports 5 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 a low-temperature exhaust gas in a heat exchanger 16 on the downstream side of the combustion chamber 6, and is discharged to the atmosphere from an exhaust unit 17.

Now, the combustion air supplied to the air chamber 4 is gradually ejected into the combustion chamber 6 from the air port 5 on the upstream side of the inclined surface 7. The stagnation space 14 has the function of temporarily damming up the combustion air flow in the static electricity chamber 4 at the most downstream side and causing it to stagnate. Therefore, the combustion air ejected from the air port 5 on the downstream side is ejected perpendicularly to the inclined surface 7 because the air port 5 serves as a substantially static pressure port. As a result, the flame length is further reduced, and the flame surface farthest from the flame-holding air port 15 is also stabilized without being fanned.

Further, by providing the stagnation space 14, the bending radius of the downstream side of the air injection plate 2 can be increased. Therefore, there is no possibility that a part of the air port 5 is included in the bent part due to variations in processing as in the conventional case, and the flame is not fanned from upstream.

FIG. 4 shows a comparison of the performance of the present invention and the conventional technology. Compared to the noise value already at the combustion set point based on conventional combustion performance,
The combustion performance of the present invention is improved by reliably preventing flame fanning and by further reducing the flame length, and the set point a
It is clear that the noise value of can be reduced.

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

(1) By providing a stagnation space, the flow of combustion air in the air chamber can be temporarily stagnated and the air port can act as a static pressure port, so that air can be ejected almost perpendicularly to the inclined surface to the downstream side. Therefore, flame fanning can be prevented, and noise reduction and combustion performance can be improved.

? ) By providing a stagnation space, a part of the air opening is no longer included in the bent part of the air injection plate, and flames can be reliably prevented from escaping, resulting in more stable performance.

(3) If a part of the burner case is made to protrude, it acts as a rib, thereby increasing the mechanical strength of the burner case.

G41 By ejecting combustion air perpendicular to the inclined surface, the flame can be reliably deflected to the center of the combustion chamber, which reduces the temperature of the combustion chamber wall surface and improves reliability.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a high-load combustion device showing an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view showing the main parts of the device,
Fig. 3 is a partial sectional view of Fig. 2, Fig. 4 is a comparative illustration of noise and combustion performance, Fig. 5 is a partially enlarged perspective view showing the main parts of the conventional example, and Fig. 6 is a partial cross-sectional view of Fig. 5. FIG. 1... Burner case, 2... Air injection plate, 3... Burner body, 4... Air chamber, 5... Air port , 6... Combustion chamber, 7
... Slanted surface, 8 ... Flame mouth part, 14 ...
...Stagnation space. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (2)

[Claims] (1) A burner body equipped with a burner port having a large number of burner ports, a burner case that surrounds the outer periphery of the burner body and forms part of an air chamber, and a burner case that surrounds the burner body and forms a part of the air chamber, and It has an air injection plate located on the downstream side and having a large number of air ports arranged on an inclined surface in a zigzag pattern for ejecting combustion air at an angle toward the fuel flowing out from the flame port into the combustion chamber,
The air injection plate is connected to the burner case and the burner body to partition the combustion chamber and the air chamber, and
A high-load combustion device in which a stagnation space is provided downstream of the air port. (2) The high-load combustion device according to claim 1, wherein the stagnation space is provided by locally protruding a part of the burner case to the side opposite to the flame port.