JPS63140218A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To prevent incomplete combustion and also generation of CO gas by controlling the rotational speed of a blower for combustion according to a value of pressure detected by an atmospheric pressure detector which is provided near the main body of a burner. CONSTITUTION:A combustion cylinder 2 and burner 3 are provided in the main body 1, and combustion air is supplied to the burner 3 through a supply air pipe 5 by a blower 4 for combustion. On the other hand, the fuel supplied by a fuel pump 6 passes through a fuel pipe 7 and is delivered via a carburetor into the burner 3 and ignited by an ignitor 8 to burn. An atmospheric pressure detector 9 sends its detection output to a rotational speed controller 10 to control the rotational speed of a blower 4 for combustion in order to offset the increase and decrease in the air density. For example, when the atmospheric pressure falls when a burner is used in high altitude, etc., the air density decreases so that for the same amount (volume) of air the pressure difference in the pressures in front of and at the rear of a throttle plate 5a becomes smaller. if the output of this pressure difference is compared with the output from the atmospheric pressure detector 9 and made an input to a rotational speed controller 10, it is possible to cope exactly with high altitudes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to combustion devices such as oil fan heaters and FF warm air fans.

2. Description of the Related Art In general, this type of combustion apparatus forcibly supplies air and also forcibly supplies fuel using a fuel bong or the like for combustion. That is, as shown in Fig. 5, a combustion tube B and a burner C are provided in the main body A, and combustion air supplied by a combustion blower and fuel supplied by a fuel pump E are passed through a carburetor (not shown). It is designed to be forced to burn.

Problems to be Solved by the Invention However, in the above-mentioned forced combustion mechanism, the combustion air and fuel to be supplied are each controlled independently, and although it has the function of directly controlling each at a set constant level, there are various Depending on the usage environment and other factors, the chain may fluctuate and cause incomplete combustion. In particular, the air density varies greatly depending on the atmospheric pressure or altitude used, and incomplete combustion may generate CO, causing serious accidents. For this reason, conventional combustion devices require visual adjustment of the fuel bong flow rate or replacement of parts. Particularly in recent years, the aforementioned incomplete combustion has become a major problem from the viewpoint of pursuing safety.

The purpose of the present invention is to solve such conventional problems by keeping the ratio of the amount of combustion air (weight) supplied to the fuel (air-fuel ratio) constant and maintaining complete combustion.

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention is configured to control the rotational speed of the combustion blower according to the atmospheric pressure detection device provided near the main body. It is composed.

Effects According to the present invention, when the atmospheric pressure changes due to use at a high altitude, etc., the amount of air is increased by the amount of change in air density to keep the air-fuel ratio constant and a good combustion state can always be obtained.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In FIG. 1, a combustion tube 2 and a burner 3 are provided in a main body 1, and combustion air is supplied to the burner 3 via an air supply pipe 5 by a combustion blower 4.

On the other hand, the fuel supplied by the fuel pump 6 passes through the oil pipe 7, is sent to the bar 3 via a carburetor (not shown), and is ignited by the igniter 8.

Reference numeral 9 denotes an atmospheric pressure detection device installed near the main body 1, and sends its detection output to the rotation speed control device 10 to send the combustion air @ 4.
The rotation speed is controlled. That is, main body 1
The rotational speed of the combustion blower 4 is increased or decreased depending on the altitude at which the combustion blower is installed, thereby offsetting the increase or decrease in air density.

FIG. 2 shows an outline of the above-mentioned rotation speed control circuit, in which the output from the atmospheric pressure detection device 9 is sent to the rotation speed control device 10 so as to match the output from the main output provided in the air supply pipe 5. to control the rotation speed of the combustion method@machine 4.

FIG. 3 shows the configuration and principle diagram of the throttle part, where the flow rate Q is the differential pressure h generated before and after the throttle plate 5a, the density of the flowing fluid is γ,
If the density of the fluid in the 0-shaped pipe is γ, then φ=α(551τ
It is represented by m-. Note that α is a coefficient and gii is the gravitational acceleration. As is clear from this equation, when the atmospheric pressure decreases when used at high altitudes, the air density γ decreases, so the differential pressure decreases even with the same amount of air (volume). On the other hand, the air required for combustion is the same as in normal (flat land). Here, if the flow rate (volume) Qo and density r0 are on a flat ground, then the mass flow rate o m
o ”'γ. Qo. Also, if the flow rate (volume) QH at high altitude and the density γH, then the mass flow rate Q. H = γH'Q
H Therefore, to set Qmo=QmH, OH=γVγHQo
Therefore, the flow rate (volume) increases depending on the ratio of air density reduction.
It is necessary to increase This increases the differential pressure before and after the constriction part by the same ratio, and the output of this differential pressure is compared with the output from the atmospheric pressure detection device 10, and the input to the rotation speed control device 10 is determined. Feedback control enables accurate high altitude response.

Effects of the Invention As described above, the combustion apparatus of the present invention constantly controls the amount of air supplied for combustion according to changes in atmospheric pressure, and also maintains the amount of air constant under atmospheric pressure, thereby preventing incomplete combustion. This can prevent unsafe conditions (for example, the generation of CO). In addition, as in the embodiment, accurate control can be achieved by detecting the differential pressure before and after the constriction part of the air supply pipe with a differential pressure sensor, that is, by directly measuring the amount of air and controlling it according to changes in atmospheric pressure. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device in an embodiment of the present invention;
FIG. 2 is an explanatory diagram of the control circuit, FIG. 3 is a sectional view illustrating the differential pressure and flow rate of the throttle section, and FIG. 4 is a sectional view of a conventional combustion device. 3... Burner (combustion part), 4... Combustion blower, 5... Air supply pipe, 5a...
Throttle section, 9... Atmospheric pressure detection device, 10...
...Rotation speed control device, 11...Differential pressure sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person3-
- Burna Ba7 Mito) Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) Comprising a combustion section, a combustion blower, a rotation speed control device for the combustion blower, and an atmospheric pressure detection device, and the combustion blower controls the rotation speed according to the pressure detected by the atmospheric pressure detection device. A combustion device that increases or decreases the amount of air blown. (2) The combustion blower has a constriction part provided in a part of the air supply pipe and a differential pressure sensor that detects the differential pressure before and after the constriction part. 2. A combustion device according to claim 1, configured to adjust the