JPH0428965B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a variable combustion rate pulse combustor that can be used as a heating device for industrial, commercial or domestic water heaters, hot air equipment, etc. Conventional configuration and its problems A conventional pulse combustor consists of a combustion chamber, a tail pipe, an air passage with an air valve, and a fuel passage with a fuel valve.Combustion air is supplied in advance by a blower. The fuel is supplied to the combustion chamber, and then fuel is supplied and ignited using an igniter or the like to start operation. Then, explosive combustion occurs in the combustion chamber, the pressure in the combustion chamber increases, the air valve and the fuel valve close, the supply of fuel and air is stopped, and the combustion gases are exhausted from the tailpipe. after that,
The pressure in the combustion chamber becomes negative and the fuel and air valves open to supply air and fuel to the combustion chamber.
At the same time, the hot combustion gases flow back and ignite the fuel-air mixture, causing explosive combustion again, followed by similar ignition, explosion, and suction of fuel and air without the blower, followed by regular explosive combustion. . A drawback of such a pulse combustor is that the range in which the combustion amount can be adjusted is small, and the combustion amount could only be reduced to about 1/2 of the maximum combustion amount. Therefore,
When used as a water heater or hot air fan with a small amount of combustion, the hot water temperature or hot air temperature must be adjusted by turning the combustor on and off. I couldn't get it. In addition, because the adjustment range of combustion amount is small, it is not possible to share the combustion section of equipment that requires large output with equipment that requires small output, and the combustion section must be designed according to various outputs. Moreover, it was impossible to avoid an increase in costs due to an increase in the types of molds and various parts for the combustion section. Purpose of the Invention In view of the above conventional problems, an object of the present invention is to provide a pulse combustor that has a wide adjustment range of combustion amount and can vary combustion amount by reducing changes in pulse frequency. . Structure of the Invention In order to achieve this object, the present invention provides an exhaust gas regulator in the exhaust passage that communicates with the tail pipe from the combustion section via an exhaust cushion chamber in the pulse combustor, and provides a fuel regulator in the fuel passage. The present invention provides a variable combustion amount pulse combustor in which the combustion amount is adjusted by controlling these regulators. In a preferred embodiment, both regulators are linked via a controller. Further, a heat exchanger having the combustion section as a component thereof is provided, a temperature sensor of a heat medium around the combustion section is provided, and a signal thereof is inputted to the controller to operate both the regulators. configured. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, 1 is a combustion chamber, 2 is a tail pipe communicating with the combustion chamber 1 on the same axis, and a combustion section 3 is constituted by these. Reference numerals 4 and 5 denote an air passage and a fuel passage, respectively, which communicate with the combustion chamber 1 from the radial direction. Reference numerals 6 and 7 are a fuel valve and a fuel regulator provided in the fuel path 5, respectively. 8 is a fuel nozzle, and 9 is a fuel cushion chamber. 10 is an air valve provided in the air passage 4, 11 is a blower, and 12 is an air cushion chamber. 13 is the exhaust cushion chamber,
It is arranged downstream of the tail pipe 2. 14 is an ignition electrode of the combustion chamber 1. 15 is a heat exchanger configured with the combustion section 3 as a component;
is its outer wall, 17 is a heat medium, and 18 is a temperature sensor for detecting the temperature of the heat medium 17. Reference numeral 19 denotes an exhaust passage extending from the exhaust cushion chamber 13, and an exhaust gas regulator 20 is interposed in the middle of the exhaust passage. A controller 21 is connected to the fuel regulator 7 and the exhaust gas regulator 20, and is configured to control both in conjunction with each other, and a signal from the temperature sensor 18 is input thereto. 22 is a power source. 25 is the inlet or outlet of the heat medium. Next, the operation will be described. Air is sent to the combustion chamber 1 by the blower 11, fuel gas is supplied to the combustion chamber 1, and when the air-fuel mixture is ignited by the ignition electrode 14, it explodes and burns to form a fire 23. This explosion and combustion

[Table] As shown in the table, by changing the opening degree of the exhaust gas regulator, the combustion amount can be increased to 11,000kcal/
h20000 kcal/h can be used as 3000 to 8000 kcal/h. In this case, the exhaust gas regulator 20 is installed in an exhaust path extending from the exhaust cushion chamber 13, and even if the opening degree of the exhaust gas regulator 20 is changed, the pulse frequency does not change much. Even if a muffler is installed on the inlet side or the outlet side of the pulse combustor, the silencing effect can be sufficiently exerted. Next, the stable combustion region in the pulse combustor will be explained with reference to FIG. 2. The stable region indicates a state in which pulse combustion continues and little CO is generated. In Fig. 2, the horizontal axis indicates the maximum combustion amount in the stable region when the exhaust gas regulator 20 is fully opened.
The vertical axis shows the opening when the exhaust gas regulator 20 is fully opened, and the straight lines 26 and 27 show the combustion amount when the exhaust gas regulator 20 is fully opened. It shows changes in the minimum combustion amount and maximum combustion amount in the stable region when the opening is changed, and it is recognized that both straight lines 26 and 27 decrease when the opening degree is changed small. Therefore, when the exhaust gas regulator 20 and the fuel regulator 7 are linked and the opening degree of the exhaust gas regulator 20 is increased as the combustion amount, that is, the fuel gas flow rate increases, the combustion amount adjustment range becomes A in the figure. It is possible to increase the amount of hot food to the adjustment range of C,
The combustion amount adjustment range can be expanded by more than double. In addition, by detecting the temperature of the heat medium 17 with the temperature detector 18 and controlling the fuel regulator 7 and the exhaust gas regulator 20 in conjunction with the controller 21,
Regardless of the flow rate of the heat medium 17 supplied from the heat medium inlet 25, it is possible to supply the heat medium at a constant temperature. Effects of the Invention According to the variable combustion amount pulse combustor of the present invention, as is clear from the above explanation, since a fuel regulator and an exhaust gas regulator are provided, the same combustor can be used by adjusting the exhaust gas regulator. This means that it can be used in both cases with large and small combustion volumes, thereby avoiding the increase in costs due to the increase in types.Also, by adjusting the fuel regulator and exhaust gas regulator in conjunction, the combustion volume can be adjusted over a wide range. It has great effects, such as being able to easily supply hot water and hot air at a constant temperature. Since the exhaust gas regulator 20 is installed in the exhaust path extending from the exhaust cushion chamber 13, even if the change in combustion amount is large, the change in pulse frequency is small, and the effect of a muffler is exerted. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a combustion state. 1 is the combustion chamber, 2 is the tail pipe, 3 is the combustion part,
4 is an air path, 5 is a fuel path, 6 is a fuel pipe, 7 is a fuel regulator, 10 is an air valve, 18 is a temperature sensor, 20 is an exhaust gas regulator, and 21 is a controller.

Claims (1)

[Scope of Claims] 1. A combustion section having a combustion chamber and a tail pipe, an air passage communicating with the combustion chamber and having an air valve, a fuel passage communicating with the combustion chamber and having a combustion valve, and the tail pipe. Variable combustion rate pulse combustion comprising: an exhaust cushion chamber communicating with a pipe; and an exhaust path communicating with the exhaust cushion chamber; an exhaust gas regulator provided in the exhaust path; and a fuel regulator provided in the combustion path. vessel. 2. The variable combustion amount pulse combustor according to claim 1, wherein the exhaust gas regulator and the fuel regulator are linked via a controller. 3. The variable combustion amount pulse combustor according to claim 2, characterized in that a heat medium temperature sensor is provided around the combustion part, and the signal thereof is input to the controller to adjust the combustion amount. .