JPH0399107A - Carburetor - Google Patents

Abstract

PURPOSE:To improve the adhesion strength and durability in a carburetor for a liquid fuel burner used for room heating, etc. by screwing the male thread of a carburetor cylinder and the female thread of a throat with the intervention of an inorganic adhesive which consists of granular alumina, alkali silicate, and water and has specified viscosity. CONSTITUTION:When the male thread of a carburetor cylinder 9 made of aluminium alloy diecasting and machined by cutting is screwed to the female thread of a throat 11 made of austenite stainless steel, and inorganic adhesive 13 which contains granular alumina and an alkali silicate and has the viscosity regulated at 15000 cp - 50000 cp at room temperature with the addition of water is attached to both threads when they are connected, and the adhesive is allowed to harden. With this constitution the adhesion strength and durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vaporizer for a liquid fuel combustor for domestic or commercial use such as space heating and hot water supply. Conventional Technology Generally, this type of vaporizer is heated by a sheath heater to vaporize the kerosene supplied inside, mix it with combustion air, and supply it to the combustion section. This is explained below using a diagram. FIG. 3 is a longitudinal sectional view of a carburetor block installed in a conventional kerosene vaporization type combustion machine. In Figure 3,
Reference numeral 1 denotes a carburetor tube made of die-cast aluminum alloy, in which a sheathed heater 2 is provided in the form of an insert. be.

The throat 3 serves as a guide for supplying combustion air into the vaporizing cylinder, and a nozzle 5 for supplying liquid fuel, here kerosene, is provided inside. When the kerosene supplied from the nozzle 5 is supplied into the vaporizer cylinder 1, it is heated to the sheathed heater 2.
It volatilizes in the vaporization cylinder heated by the energization, mixes with the combustion air entering from the throat 3, passes through the flame holding plate 6, and forms a flame 8 by the spark of the ignition electrode 7. By efficiently transmitting heat from the flame 8, the vaporizing tube 1 raises the temperature of the entire vaporizing tube 1, and can sufficiently vaporize kerosene even without energization of the sheathed heater 2. For this reason, the vaporizer cylinder 1 is made of an aluminum alloy with good thermal conductivity. The sheathed heater 2 can be made into an insert by making the vaporizing tube l die-cast from an aluminum alloy, such as ADC12. Further, since the throat can be formed at low cost by press working, austenitic stainless steel such as SUS304 is used.

Problems to be Solved by the Invention However, in the above-mentioned conventional carburetor, the female thread of the aluminum alloy die-casting of the carburetor tube l is made by cutting, and the male thread of the austenitic stainless steel mesh of the throat 3 is made by pressing. There is an issue with the loose fit of the screws. Adhesive 4 is used to help with this, but since it is used at temperatures exceeding 300°C, organic adhesives cannot be used. Therefore, an inorganic adhesive with water as a solvent is used, but it is usually 1000 to 3000 cp.
There are many types of adhesives. With such a material, there was a problem that it was difficult to apply it to the throat 3 because it easily flowed.

In addition, after the screws are fitted, the adhesive is cured by applying electricity to the sheathed heater 2, but water, which is the solvent for the adhesive, boils inside, significantly deteriorating the adhesive surface and reducing the adhesive strength. There was also. Furthermore, since the aluminum alloy die-casting and the austenitic stainless steel were bonded together, there was a problem with durability against cold and hot cycles.

The present invention is intended to solve these problems, and aims to facilitate the application of adhesive, improve adhesive strength, and improve durability. Means for Solving the Problems In order to achieve the above object, the present invention adjusts the silicate and water to make the adhesive have a viscosity of 15, OOOcp ~ 50.00 at room temperature.
In order to reduce the flow by setting the adhesive to 0 cp, and using particulate alumina and alkali silicate to reduce moisture and make it easier for water vapor to dissipate inside the adhesive, and further strengthen the adhesion with the aluminum alloy, The adhesive contains alumina and has good adhesion to the alumina coating on the surface.

Function: Due to the above-mentioned structure, the vaporizer of the present invention is less likely to run down from the male thread of the throat when applying adhesive, and
Even when attached to the thread of the vaporizer cylinder, it can be applied sufficiently to the throat and the threaded part of the vaporizer cylinder. Furthermore, during curing, there is less boiling and the adhesive adheres well, and it can withstand thermal cycles.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the accompanying drawings. 6 In FIG. 1, numeral 9 is a vaporizer cylinder manufactured by die-casting an aluminum alloy. Inside this vaporizer cylinder 9,
There is a sheathed heater lO provided by insert molding, and a throat 1 screwed onto the side of the vaporizing cylinder 9.
1, and a nozzle 12 for discharging kerosene is provided inside the throat 1l.

Kerosene is discharged from the nozzle 12 into the vaporization tube 9 heated by the sheathed heater 10, and evaporates inside the vaporization tube 9.
It is mixed with the air sent from the throat 11 and supplied to the upper combustion section.

The vaporizing tube 9 and the slow eye 1 are fixed together with an adhesive 13. FIG. 2 shows an enlarged view of the joint A between the vaporizing tube 9 and the throat 11 in FIG. As shown in Fig. 2, the threads of the vaporizer cylinder 9 are machined, so the cross section of the threads is sharp like a saw. The shape resembles a series of mountains and valleys. Adhesive 13 is applied between the vaporizer tube 9 and the screw of the throat H3;
The material applied to the screws is bonded to the vaporizer tube and adheres to it. At this time, a slight void 14 is formed.

The following adhesives were tested.

* B and C also include organic resins and fibers.

The result was as follows.

As mentioned above, high viscosity is advantageous in terms of ease of application. Adhesion was measured by screw loosening torque. ◎ means loosening at 20 kg-cm or more, △ means loosening at 10 kg-(self) or more, × means 10 kg・c
Items that loosen at m or less. That is, if there is a lot of water, the adhesion will deteriorate due to severe boiling. Regarding repeated heating and cooling, the conditions are that the particle size is appropriate and that boiling is successfully eliminated.

Of course, in order to achieve these conditions, the following considerations must be made. This is because there is little water in the adhesive, so if you leave it in the air, it will start to harden quickly.
It must be stored in a manner that prevents it from coming into contact with air as much as possible, and it must be quickly attached to the threaded part of the vaporizer cylinder after being applied to the throat.

For this reason, when applying by hand, it is necessary to squeeze out the container from a very soft container to prevent air from entering, and when using an automatic application machine, it is necessary to use a container that has a shielding structure to prevent air from coming into contact with it, rather than being directly pumped with air. You need to use one, but there are some that are already commercially available, so you can use them.

As described above, the joint between the vaporizer cylinder and the throat in the present invention is made of aluminum alloy die-casting and austenitic stainless steel, which are different metals, and are hardened to withstand cold temperatures of 400'C. Practically 35
Since it is below 0'C, it is estimated that it can be fixed semi-permanently.

In addition, in the present invention, the viscosity is 1.5,000 to 50,000.
cp, but if the viscosity is increased too much, it will harden quickly in the air, making it difficult to apply to the throat and worsening workability, so 50,000 cp or less is considered appropriate. Furthermore, the particle size was set to 10 to 50 μm, but if the particle size is too small, the particles will jump significantly during boiling, resulting in poor adhesion, and if the particle size is too large, the adhesion will decrease. For this reason, it is sufficient that about 5 to 50% of the particles have a diameter of about 10 to 50 μm; too little is ineffective, and too much causes a decrease in adhesion.

Although the present invention has been described here with respect to a kerosene vaporizer, other combustors may be used. Also, if alumina is present to some extent, it will not have a big effect even if other substances are ignited, but organic substances can ensure sufficient throat bonding and can also be easily applied with adhesive.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a carburetor in an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a longitudinal sectional view of a conventional carburetor. 9... Carburizer cylinder, 11... Throat, 1
3. Group/adhesive.

Claims (2)

[Claims] (1) Consisting of an aluminum alloy die-cast vaporizer tube with a machined male thread and an austenitic stainless steel throat with a press-formed male thread;
Contains at least particulate alumina and alkali silicate,
Add water and adjust the viscosity to 15,000 cp to 50,00 at room temperature.
A vaporizer in which an inorganic adhesive adjusted to 0 cp is adhered between the male screw and the female screw, the two are screwed together, tightened, and the adhesive is hardened to secure the vaporization cylinder and the throat. (2) A patent claim characterized in that the adhesive contains at least 5% and 50% of the total weight of the adhesive, at least inorganic particles having a particle size of 10 μm or more and 50 μm or less. The vaporizer according to item 1.