JPH0748002B2 - Vaporizer - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a vaporizer for a liquid fuel combustor for domestic use such as heating and hot water supply or for commercial use.

2. Description of the Related Art Generally, a vaporizer of this type is heated by a sheath heater to vaporize kerosene supplied therein, mix the vaporized kerosene with combustion air, and supply the mixture to a combustion section.

This will be described below with reference to the drawings.

FIG. 3 is a vertical sectional view of a carburetor block incorporated in a conventional kerosene vaporization type combustor. In Figure 3,
Reference numeral 1 denotes a vaporization cylinder made of aluminum alloy die casting, a sheath heater 2 is provided inside by insert molding, and a throat 3 is fixed to a side surface of the vaporization cylinder 1 by screw fitting with an adhesive 4. . The throat 3 serves as a guide for supplying combustion air into the inside of the vaporization 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 vaporization cylinder 1,
It volatilizes in the vaporizing cylinder heated by the energization of the sheath heater 2 and mixes with the combustion air coming from the throat 3,
A flame 8 is formed by the spark of the ignition electrode 7 passing through the flame holding plate 6. The vaporization cylinder 1 efficiently transfers the heat from the flame 8 to raise the temperature of the entire vaporization cylinder 1 and sufficiently vaporize kerosene without energizing the sheath heater 2. Therefore, the vaporization cylinder 1 is made of an aluminum alloy having good thermal conductivity. The sheath heater 2 can be insert-molded by forming the vaporization cylinder 1 from a material such as an aluminum alloy die-cast, for example, ADC12. Further, since the throat can be made inexpensive by forming it by press working, austenitic stainless steel such as sus304 is used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional vaporizer, the internal thread of the aluminum alloy die casting of the vaporization cylinder 1 is formed by cutting, and the austenitic stainless steel external thread of the throat 3 is formed by pressing. There is a problem that screws are not fitted properly. Although the adhesive 4 is used to help this, an organic adhesive cannot be used because it is used at a temperature exceeding 300 ° C. Therefore, an inorganic adhesive in which water is used as a solvent is used, but an adhesive having 1000 to 3000 cp is usually used. If it is like this, throat 3
There was a problem that it was difficult to apply to. After the screws are fitted to the adhesive, the sheath heater 2 is energized and hardened, but the solvent of the adhesive, water, boils inside, causing the adhesive surface to deteriorate significantly and the adhesive strength to drop. There was also. Furthermore, because of the adhesion of aluminum alloy die casting and austenitic stainless steel, there was a problem in durability against the heat cycle.

The present invention solves such a problem, and it is an object of the present invention to facilitate application of an adhesive, improve adhesive strength, and improve durability.

Means for Solving the Problems In order to achieve the above object, the present invention is an adhesive to adjust the viscosity of silicate or water to make the viscosity 15,000 cp to 50,000 cp at room temperature and make it difficult to flow, and particulate alumina and silicate. As an adhesive containing alumina that has good adhesion to the alumina coating on the surface in order to reduce the water content by using an alkali salt and to make it easier for water vapor to dissipate inside the adhesive and to enhance the adhesion with the aluminum alloy. There is.

Action The vaporizer of the present invention, due to the above configuration, is less likely to run off than the male screw of the throat when the adhesive is applied,
Moreover, even when the screw is attached to the screw of the vaporization cylinder, the throat and the screw portion of the vaporization cylinder can be sufficiently coated. In addition, even when it is cured, the boiling point is small and the adhesive adheres well, so that it can sufficiently withstand the thermal cycle.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 9 is a vaporizing cylinder manufactured by aluminum alloy die casting. Inside the vaporization cylinder 9,
There is a sheathed heater 10 provided by insert molding,
Further, a throat 11 screwed with a screw is provided on the side surface of the vaporization tube 9, and a nozzle 12 for discharging kerosene is provided inside the throat 11. Kerosene is discharged from the nozzle 12 into the vaporization cylinder 9 heated by the sheath heater 10, evaporated inside the vaporization cylinder 9, mixed with the air sent from the throat 11, and supplied to the upper combustion section.

The vaporizing cylinder 9 and the throat 11 are fixed to each other with an adhesive 13. FIG. 2 shows an enlarged view of the joint portion A between the vaporizing cylinder 9 and the throat 11 shown in FIG. As shown in FIG.
Since the screw of the vaporizing tube 9 is cut, it shows a cross section of a sharp screw like a saw, but the screw of the throat 11 has a shape like continuous gentle peaks and valleys due to press working. ing. Adhesive 13 is vaporizer tube 9 and throat
It is applied between the 13 screws, which is applied by screwing the screw applied to the throat 11 onto the vaporization tube. At this time, a slight void 14 is formed.

The following adhesives were tested.

This resulted in the following:

As described above, high clay is advantageous in terms of ease of application. The adhesiveness was measured by loosening torque of the screw. ◎ is loose at 20 kg / cm or more, △ is loose at 10 kg / cm or more, × is loose at 10 kg / cm or less. That is, when there is a lot of water, the adhesion is reduced because boiling is severe.
Regarding the cold heat repetition, it is a condition that the particle size is appropriate and boiling is solved well.

Of course, the following consideration is required to realize such conditions. Since the adhesive has little water, if it is left in the air, it will start to solidify immediately, so it needs to be stored so that it does not touch the air as much as possible. It is necessary to attach it to the screw part of. For this reason, in the case of hand-painting, use it by squeezing it out from a very soft container to prevent air from entering, and in an automatic coating machine, not a direct pressure feed with air, but a shield structure that does not touch the air It is necessary to use, but there are some that are already on the market, so you can use it.

As described above, the joining of the vaporization cylinder and the throat in the present invention is carried out by applying the adhesive of the present invention to the heterogeneous screw fitting of the dissimilar metals such as aluminum alloy die casting and austenitic stainless steel, for example, a sheath heater. It can withstand the cold heat of 400 ℃ by being hardened by heating by applying electricity. Since it is practically 350 ° C or lower, it is presumed that it can be fixed semipermanently.

Further, in the present invention, the viscosity is set to 15,000 to 50,000 cp, but if the viscosity is increased too much, curing in air is fast, application to the throat is difficult, and workability deteriorates. . Further, the particle size is 10 to 50 μm,
If it is too small, it will largely pop out and cause poor adhesion during boiling, and if the particle size is too large, the adhesion will decrease. For this reason, it is sufficient that the size of the film is about 10 to 50 μm and about 5 to 50%
If it is too small, there is no effect, and if it is too large, the adhesion is reduced.

Further, in the present invention, since the adhesive is heated from the inside by causing the sheathed heater provided with the vaporization tube to generate heat, the adhesive is cured from the inside, and the moisture in the adhesive smoothly Get out. Therefore, for example, when a vaporization cylinder with a screwed throat is put in a furnace and heated, the adhesive hardens from the outside and the moisture inside does not escape well, and when the adhesive is cured to a high pressure, the adhesive hardens. It is possible to secure reliable adhesiveness and airtightness without destroying the surface of the.

The invention has been described herein with a kerosene vaporizer, but other combustors may be used. Also, if alumina is present to some extent, addition of other substances will not have a significant effect, but with organic substances, there is a limit to high temperature cold heat.

Effects of the Invention As described above, according to the present invention, the following effects are obtained.

A, female threads are cut on the vaporization cylinder side, male threads are press-molded on the throat side, and these are screwed together to ensure reliable connection and airtightness even if there is a gap between them. .

B. Even if the vaporizing cylinder is made of aluminum alloy die cast and the throat is made of a completely different material such as austenitic stainless steel, reliable joining can be ensured for a long period of time.

C. Since the adhesive intervening in the screw joint is heat-cured from the inside by the sheath heater, the surface of the adhesive is not destroyed when the water content in the adhesive boils and escapes to the outside. In addition, bubbles are less likely to remain in the adhesive, and reliable adhesiveness and airtightness can be ensured for a long period of time.

D, screwing work of the throat to the vaporizing cylinder can be performed easily and satisfactorily.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vaporizer according to an embodiment of the present invention,
FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1, and FIG. 3 is a vertical cross-sectional view of a conventional vaporizer. 9 ... Vaporizer, 11 ... Throat, 13 ... Adhesive.

Claims (2)

[Claims] 1. A vaporization cylinder made of an aluminum alloy die cast having a female heater formed by cutting and having a sheathed heater embedded therein, and a throat of an austenitic stainless steel having a male screw press-molded, and at least particulate alumina and silicate. Contains alkali salt, and when water is added, the viscosity becomes 15,0 at room temperature.
An inorganic adhesive adjusted to 00 cp to 50,000 cp is attached between the male screw and the female screw, both are screwed together and tightened, and the adhesive is heated by a sheath heater in a vaporization cylinder to form a male screw and a female screw. A vaporizer in which the vaporization cylinder and throat are fixed by curing between them. 2. The adhesive is characterized in that at least inorganic particles having a particle size of 10 μm or more and 50 μm or less are contained in 5% or more and 50% or less of the total weight of the adhesive. The vaporizer according to claim 1.