JPS63279056A - Column vibration restricting mechanism in combustion device for hot water - Google Patents

Abstract

PURPOSE:To restrict an occurrence of vibration of column, make a small-sized combustion apparatus for hot water and a low noise of the apparatus by a method wherein a by-pass passage by-passing a heat exchanger is arranged outside the combustion chamber. CONSTITUTION:In a hot water combustion apparatus 4 provided with a hot water heat exchanger 3 at a downstream side of a burner 2 within a combustion chamber 1, a bypass passage 4 by-passing a heat exchanger 3 is arranged outside the combustion chamber 1. A part of the combustion gas is flowed in the by-passing passage 4 from an up-stream side of the heat exchanger 3 and flowed to a downstream side of the heat exchanger 3 and then it is discharged out of a discharging port 5 together with the combustion gas passed through the heat exchanger 3. Vibrations of column in each of the modes diminish with each other through an inlet 6 and an outlet 7 of the bypass passage 4 in the upstream and downstream sides of the heat exchanger 3 and, therefore, it is possible to make hard a spatial vibrating condition of a column vibration of the burner of a specified mode. As a burner 2, an original mixing burner is applied and in case that a high density short flame 8 of plane shape is formed at the end part of the combustion chamber 1, an occurrence of column vibration is restricted. Heat of the combustion gas passed through the bypass passage 4 can effectively utilized under an arrangement of a heat exchanger 3'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air column vibration suppression mechanism in hot water combustion devices such as boilers 2 and water heaters.

(Prior art and its problems) Some of the noise generated in hot water combustion devices such as boilers and water heaters is due to air column vibration.
In high-load combustion aimed at making the combustion chamber more compact, forming a planar, high-density, short flame at the end of the combustion chamber using a pre-mixing burner will not easily occur, but will generate large noise.

Conventionally, it has been difficult to theoretically design combustion equipment so as not to generate such air column vibrations, and in order to prevent their occurrence, individual trial and error is required for each model, and a great deal of effort is required. It takes effort, time, and money.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The configuration of the present invention will be explained based on FIGS. 1 and 2 corresponding to the embodiment. In a hot water combustion device 4 provided with a hot water heat exchanger 3 on the side, a bypass passage 4t for bypassing the heat exchanger 3 is provided outside the combustion chamber 1, and a second In the invention, the bypass passage 4 is also provided with a heat exchanger 3'.

(Function) In the above configuration, a part of the combustion gas flows from the upstream side of the heat exchanger 3 through the bypass path 4 to the downstream side of the heat exchanger 3, and then passes through the heat exchanger 3. It is exhausted from the exhaust port 5 together with the burned combustion gas. Therefore, the mode of air column vibration that should be excited under the condition that the bypass passage 4 is not provided can be easily made different from the mode of air column vibration that should be excited within the bypass passage 4, so that each The mode of air column vibration occurs at the inlet 6 of the bypass passage 4 on the upper and downstream side of the heat exchanger 3. They cancel each other out through the output lower t-, so that it becomes difficult to satisfy the spatial excitation conditions for air column vibration in a specific mode. Therefore, even when a former mixing type burner is used as the burner 2 and a planar high-density short flame 8 is formed at the end of the combustion chamber 1, the occurrence of air column vibration can be suppressed.

The heat of the combustion gas that has passed through the bypass passage 4 can be effectively utilized by, for example, installing a second heat exchanger (not shown) between the outlet lower and the exhaust port 5, and the heat can be transferred to the bypass passage 4 as shown in FIG. A heat exchanger 3' can be provided and used effectively. In addition, if the amount of combustion gas to be passed through the bypass passage 4 is set to a small amount, it may be exhausted as it is from the exhaust port 5 depending on the case. A bypass path is provided outside the heat exchanger to cancel out the air column vibrations that would be excited under conditions where no bypass path is provided, thus making it difficult to satisfy the spatial excitation conditions for the air column vibrations. Therefore, even when a flat high-density short flame is formed at the end of the combustion chamber using an original mixing burner, the occurrence of air column vibration can be suppressed. Thus, the present invention has the effect of reducing the size and noise of hot water combustion devices such as boilers and water heaters.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic overall explanatory diagrams corresponding to embodiments of the present invention. Code 1... Combustion chamber, 2... Burner, 3.3'...
Heat exchanger, 4... Bypass path, 5... Exhaust port, 6.
...Inlet, 7...Outlet, 8-...High-density short flame Figure 1 Air Figure 2

Claims (2)

[Claims] (1) A hot water combustion device in which a hot water heat exchanger is provided on the downstream side of a burner in a combustion chamber, characterized in that a bypass path is provided outside the combustion chamber to bypass the heat exchanger. Air column vibration suppression mechanism in hot water combustion equipment (2) In a hot water combustion device in which a hot water heat exchanger is provided on the downstream side of a burner in a combustion chamber, a bypass passage that bypasses the heat exchanger is provided outside the combustion chamber, and the bypass passage Air column vibration suppression mechanism in a combustion device for hot water, characterized by having a heat exchanger installed in the combustion equipment.