JPH0114483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device that performs surface combustion on the combustion surface of a combustion tube.

Conventional configuration and its problems A conventional combustion device of this type is shown in FIG.

1 is a carburetor cylinder, 2 is a combustion tube, 3 is a combustion fan,
4 is a combustion tube made of wire mesh or metal foam placed on the top of the vaporizer cylinder, 5 is an outer tube, 6 is a top plate that is closed between the outer tube and the ignition device 7 and flame detection device 8. It is installed facing tube 4.

Next, the operation will be explained. The fuel and air sent from the fuel capillary 2 and the combustion fan 3 are vaporized in the high-temperature part of the vaporization cylinder 1, guided to the upper part as a premixture, and ejected from the combustion cylinder 4, and ignited by the ignition device 7 to produce a combustion flame. Formed on the surface of the combustion cylinder. In this case, the surface area of the combustion tube is very large, and the flame hole load, which is the amount of combustion per unit area, is very small, resulting in the combustion of a premixture with a low fuel concentration. Therefore, ignition by the ignition device 7 requires a very high discharge output power, and raw gas and carbon monoxide are generated due to mis-ignition or ignition delay, and the combustion flame after ignition is a short flame. The flame current in the flame detection device using the flame rod was very small, leading to incorrect detection and poor response, causing malfunctions.

OBJECTS OF THE INVENTION The present invention solves these conventional problems and aims to increase the ignition characteristics and flame detection output by dividing the combustion tube into upper and lower sections and locally increasing the flame hole load.

Structure of the Invention The present invention includes partitioning a combustion cylinder by inserting a premixture dividing cylinder into a rectifier cylinder, adjusting the amount of division using a premixture adjustment passage, and concentrating the premixture in a part of the divided combustion cylinder. It is equipped with air-fuel mixture jet holes. With this configuration, the flame hole load is increased, the fuel concentration is increased, the flame transfer during ignition is improved, a high output flame current value is obtained, and stable flame detection is performed.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

Reference numeral 10 denotes a bottomed vaporizing cylinder, in which a sheathed heater 11 is buried around the cylinder, a combustion fan 12 is connected to a part of the bottomed opening, and a thin fuel tube is connected from a fuel tank 13 through a fuel pump 14 midway through the cylinder. Insert 15,
It faces inside the vaporizer cylinder 10. A pre-throttled mixing plate 17 is disposed on the upper surface of the vaporizing cylinder 10, and a rectifying cylinder 18 having a large number of premixture injection holes A on the upper part;
A combustion cylinder 20 made of wire mesh, metal foam, or the like is disposed between this and the rectifying chamber 19 with a minute gap. A premixture dividing cylinder 21 is installed and partitioned on the upper side of the rectifying cylinder 18, and a premixture adjustment passage 22 is provided in the center, each having a large number of adjustment holes 23. The combustion tube 2 is located on the upper side partitioned by the premixture dividing tube 21.
A flame stabilizing plate 24 is provided to cover the outside of the combustion tube 20, a part has an opening 25, a large number of premixture injection holes B are provided in the rectifying tube in that part, and an ignition device 26 is provided close to the combustion tube 20. It faces a flame detection device 27 such as a flame rod or a flame rod. A combustion space 2 is provided around the combustion tube 20.
An outer cylinder 29 made of glass or the like with good heat permeability is disposed through the combustion chamber 8 , and the vaporization cylinder 10 is placed at the bottom of the combustion space 28 .
An exhaust ring 30 is provided to enclose the exhaust port 31 and has an exhaust port 31 . The upper part is closed by a top plate 32, and the ignition device 26 and flame detection device 27 are mounted thereon. There are ventilation passages 33 around the outer cylinder 29 on the top, bottom, left and right.
, and a blower fan 34 is arranged at the rear.

In the above configuration, after heating the sheathed heater 11 in the vaporization cylinder 10 and driving the combustion fan 12, the fuel from the fuel tank 13 is sucked in by the fuel pump 14, and is injected into the vaporization cylinder 10 from the fuel thin tube 15 to vaporize the fuel. The mixed air is mixed with combustion air from the combustion fan 12, further mixed at the mixing plate 17, and then flowed upward as a premixed mixture. The premixture is in the rectifier cylinder 1
8 and enters the premixture regulating passage 22 of the upper premixture dividing cylinder 21 by a straight flow, and depending on the diameter and length of this premixture regulating passage 22, the premixture blowing hole A and Adjustment small hole 2 for adjusting the ratio to B and for rectification
3, the finely divided amount is rectified and adjusted, and a part of the divided premixture is rectified by the rectified air 19 in the rectification space 19 from the premixture jet hole A, and is ejected from the combustion cylinder 20. The other part of the premixture enters the space above the premixture split tube 21 and is concentrated into the combustion tube 2 through the premixture nozzle 2 provided at the opening 25 of the flame stabilizing plate 24. It is ignited by the ignition device 26 installed near it, and the combustion flame is sent to the combustion tube 20.
to form. Similarly, a flame detection device 27 such as a flame rod is located nearby to detect the presence or absence of a flame and the state of combustion, and is connected to a controller (not shown) connected to the fuel pump 14. Here, the premixture from the premixture nozzle B increases the premixture volume and increases the flame hole load, so the fuel concentration is concentrated and the flame is large and the flame is large in the lower part. The flame is longer and more intense than the flame in the combustion tube 20, resulting in smoother ignition, increased flame detection output of the flame rod, and a flame current value sufficient to determine the presence or absence of flame and the state of combustion. be. After further promoting the combustion reaction in the combustion space 28, the gas is released as exhaust gas from the exhaust port 31 of the exhaust ring 30. In addition, the air sent by the drive of the blower fan 34 is transferred to the outer cylinder 2 inside the blower passage 33.
9, heat is exchanged, and the hot air is released from the bottom together with the exhaust gas. Incidentally, it is also possible to have a plurality of openings 25 in the flame stabilizing plate 24 and attach an igniter or a flame detection device independently to form a flame more intensively in each element. By attaching the device 27 at a plurality of locations, it is possible to obtain a stable detection output even when the combustion amount is varied by changing the attachment position to the combustion tube 20 or changing the injection amount of the premixture.

Effects of the Invention As is clear from the above embodiments, the present invention divides the premixture by the premixture dividing cylinder and forms concentrated flames in the ignition device and the flame detection device, so that the following effects are achieved.

(1) The concentrated flame and increased flame hole load ensure good ignition, eliminate the generation of raw gas and carbon monoxide due to mis-ignition, and provide stable ignition characteristics.

(2) A long flame and a blue flame are achieved by the concentrated flame, the flame current value in the flame increases, and flame detection characteristics are obtained by stable flame judgment.

(3) By providing a plurality of concentrated flames and using a plurality of flame detection devices, sufficient flame detection characteristics can be obtained in response to the variation range of the combustion amount.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional combustion device, FIG. 2 is a sectional view of a combustion device according to an embodiment of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2. DESCRIPTION OF SYMBOLS 10... Vaporization tube, 18... Rectifying tube, 19... Rectifying space, 20... Combustion tube, 21... Premixture dividing tube, 22... Premixture adjustment passage, 23... Adjustment small hole, 24... ...Flame holding plate, 25... Notch, 26...
Ignition device, 27...Flame detection device, A, B...Premixture outlet.

Claims (1)

[Scope of Claims] 1. A vaporizing cylinder and a rectifying cylinder having a large number of premixture injection holes A are connected to a combustion cylinder via a rectifying space, and a premixture dividing cylinder is inserted into the rectifying cylinder and a partition is formed in the center. A premixture adjustment passage is provided in the section, one side of the partition is covered from the outside of the combustion cylinder with a flame stabilizing plate, and a partial opening is provided, and the premixture injection holes B are concentrated in the rectifier cylinder located at that part. A combustion device in which a flame detection device and an ignition device are placed outside the combustion cylinder near the premixture injection hole B. 2. The combustion device according to claim 1, wherein several openings are provided, the premixture injection holes B are arranged in a concentrated manner, and the flame detection means and the ignition device are arranged independently. 3. Change the diameter and length of the premixture adjustment passage in the premixture split pipe according to the combustion amount setting, and insert adjustment holes in the premixture adjustment passage and the premixture split pipe. A combustion device according to claim 1, which is provided and divided and adjusted.