JPS6014111Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forced vaporization combustion device that employs a swirl vaporization mixing method.

A conventional combustion device of this type has been constructed as shown in FIGS. 1 and 2, for example.

That is, in the figure, 1 indicates an outer wall 1a, an inner wall 1b, and a bottom wall 1c.
The cylindrical combustion device main body is made of aluminum die-casting with consideration to formability and thermal conductivity.

2 is a heater embedded in the main body 1, 3 is a fuel injection nozzle,
4 is a primary air supply port through which the nozzle 3 passes; 5 is a vaporization mixing chamber formed in, for example, a spiral shape in the main body 1 at the lower part of the outer wall 1a, the lower part of the inner wall 1b, and the bottom wall 1c; , forming a vaporization mixing section that vaporizes liquid fuel and mixes it with primary air.

6 is a partition wall that partitions the vaporization mixing chamber 5 into a spiral shape; 7
is a partition wall plate that covers the upper surface of the vaporization mixing chamber 5, and separates the vaporization mixing chamber 5, which is a vaporization mixing section, from a combustion section, which will be described later. ing.

A first burner plate 8 is mounted above the partition plate 7, and has an air-fuel mixture passage port 8a in the center and a plurality of grooves 8b, 8b, etc. in the outer periphery.

Reference numeral 9 refers to a concentric plate having a central portion drawn and provided with a screw, which is screwed into the inner threaded portion of the outer periphery of the inner wall 1b of the main body 1, and is placed on the first burner plate 8. 2
burner plate with a plurality of slits or flame holes 9a,
9a, etc., are all the way around.

In this state, the plurality of grooves 8b, 8b, etc. are connected to the flame holes 10, 1.
0, etc., and together with the flame holes 9a, 9a, etc., constitute a combustion section.

11 is a secondary air passage. In such a conventional combustion device, liquid fuel and primary air are supplied from a fuel injection nozzle 3 and a secondary air supply port 4 into a vaporization mixing chamber 5 that has been heated in advance by a heater 2 in a spiral shape as shown by the arrow. While swirling, they are vaporized and mixed to form an air-fuel mixture.

This air-fuel mixture is guided to the flame holes 9a, 9a, etc. and 10, 10, etc. through the open lower a of the partition plate 7 and the air-fuel mixture passage port 8a of the first burner plate 8, and is ignited by an ignition means (not shown). Flames 13 and 14 are formed.

By the way, in this combustion device, the amount of heat necessary for vaporizing the liquid fuel is generated by the flames 13 and 14 during the continuous combustion.
The heat from the combustion apparatus main body 1 is received by the upper end portion of the inner wall 1b, that is, the heat receiving portion 1d, and the upper end portion of the outer wall 1a, that is, the heat receiving portion 1e, respectively.
The inner wall 1b, each lower part of the outer wall 1a and the bottom wall 1 defining the
c, and is transmitted to and collected by the partition wall plate 7.

For this reason, this combustion device is designed so that the amount of heat transferred and recovered is balanced with the amount of heat required to vaporize the liquid fuel while combustion continues.

However, when trying to burn gas fuel using this combustion device, that is, when trying to burn liquid fuel at one time and gas fuel at another time using the same combustion device, the above amount of heat is The balance is different for liquid fuels and gaseous fuels, creating disadvantages.

That is, in the case of gas fuel, unlike liquid fuel, the amount of heat required for vaporization is not required, so the inner wall 1b defining the vaporization mixing chamber 5
The amount of heat taken by the primary air-fuel mixture from the outer wall 1a and the like is reduced, which in turn causes the temperature of the heat receiving parts 1d and 1e connected thereto to be higher than in the case of liquid fuel.

The material of the combustion device main body 1 is aluminum die-casting in consideration of formability and thermal conductivity, so when the above heat balance is gas fuel, especially the outer wall 1a
The heat receiving part 1e is 40mm, which is the limit of heat resistance for aluminum.
Since temperatures sometimes exceed 0°C, it has been difficult to use liquid fuel and gas fuel together in conventional combustion devices.

This invention was made in order to improve the above-mentioned problems, and provides a combustion device that can use both liquid fuel combustion and gas fuel combustion.

An embodiment of this invention will be described below with reference to FIG.

That is, as shown in the figure, a heat receiving portion 1e corresponding to the heat receiving portion 1e of the conventional device and a partition plate 7 corresponding to the partition plate 7 of the conventional device.
′ is integrated into one body, and this is made of iron-based material with good heat resistance.
For example, it is made of iron casting, steel casting, etc.

The combustion apparatus according to the invention is constructed by mounting the above-mentioned integral molding on a combustion apparatus main body 1' made of die-cast aluminum, in which the outer wall 1a' is shortened by a predetermined length.

That is, the stepped portion 15 formed at the joint between the partition wall plate 7' and the integral heat receiving part le' made of a material with higher heat resistance than the combustion apparatus main body 1' and the inner peripheral edge 7a of the partition wall plate 7' are as described above. It is assembled integrally by engaging with the upper end 16 of the outer wall and the stepped portion 17 of the inner wall of the combustion apparatus main body 1'.

Note that the other components are substantially the same as those of the conventional device, so explanations will be omitted.

As described above, according to this invention, it is possible to obtain a combustion device that is not significantly different from conventional devices in terms of weight, quality, product cost, etc., and is capable of both liquid fuel combustion and gas fuel combustion.

By using an iron-based material with low thermal conductivity for the heat-receiving part le', the conductivity of the heat required for vaporizing liquid fuel decreases, but since the heat conduction distance is short, it is almost impossible to vaporize liquid fuel. It does not affect.

Also, even if the entire combustion device body is made of cast iron, it may be used satisfactorily in terms of heat resistance and heat conduction, but it would require a built-in heater 2, which would reduce the time and effort required to form the casting. In the past, the cost increased and the precision was also lower than that of die casting.

Furthermore, if the entire structure is made of cast metal, the weight will also increase significantly.

There are the above-mentioned disadvantages, and as in the present invention, the heat receiving part 1e'
It is far more advantageous to use iron-based materials for the parts that only integrate the partition wall plate 7' and the partition wall plate 7'.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a partially cutaway view showing an example of a conventional combustion device, respectively, and FIG. 3 is a longitudinal sectional view showing an embodiment of a combustion device according to the present invention. . 1'... Combustion device main body, l a'...
Outer wall, 1b...inner wall, 1c...bottom wall,
1d... Heat receiving part, 1e'... Heat receiving part, 2... Heater 3... Fuel injection nozzle, 4... Primary air Supply port, 5...
・Vaporization mixing chamber, 7'...Partition plate, 8...
・First burner plate, 8a...Mixture passage port, 8b...Groove, 9...Second burner plate, 9a... Flame port , ... flame mouth, 13,
14...Flame, 10... In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The main body of the combustion device is made of aluminum die-cast, and has a vaporization mixing section that swirls and vaporizes fuel and fuel air, and a heater is buried in the wall that forms this vaporization mixing section. a combustion section for combusting a mixed gas of evaporated fuel and fuel air; a partition plate having an opening for communicating the combustion section and the vaporization mixing section and separating the combustion section and the vaporization mixing section; heat receiving parts located on the inner and outer peripheries of the combustion apparatus for recovering part of the heat generated during combustion to the vaporization mixing part, the partition plate and the heat receiving parts around the outer periphery having higher heat resistance than the combustion apparatus main body. A combustion device characterized in that the heat receiving part and the partition plate are integrally formed by a material and are assembled to the upper end of the combustion device main body.