JPS636586Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a low melting point blow burner for dental technology that utilizes natural gas and is used for relatively low melting melting such as dental silver brazing or wax formation.

Conventionally, this kind of low-melting-point blow burner for dental technology that uses natural gas has several parts that are assembled together so that a chip with a sintered metal at the tip of the burner that mixes natural gas and air is exposed to the outside and can be disassembled. The burner is constructed so that it can be assembled one by one, so that the burner can be cleaned as appropriate after use. However, in a blow burner that uses natural gas, the air that blows out from the center and the gas that is attracted by the air and blows out from the pores in the surrounding sintered metal mix and burn. If the air tube is not centered when assembling the natural gas and air, the mixture of natural gas and air will not be sufficient and incomplete combustion will occur.
Not only is there a risk that the gas will be wasted, or that the wind from outside will directly hit the tips of the tips and put out the fire, but there are also disadvantages such as the fire going out when you try to make it a small flame. Ta. Furthermore, when melting with a burner fueled with natural gas during silver brazing work or wax forming work, etc., it tends to melt in an overheated state, which may cause local overheating of dentures etc. or smooth surfaces. There were some difficulties in forming the .

This idea was made to eliminate the above-mentioned drawbacks, and its purpose is to create a structure that allows for good mixing of natural gas and air, so that even if wind from outside hits the tip of the tip, the flame will not go out. In addition, the air tube and gas flow path parts are integrally constructed so that the tip of the burner tip is always located in the center, and the entire tip of the burner tip is positioned in the center. The tip can be detachably attached to a bent pipe that joins the tips of both compressed air pipes and natural gas pipes, making it easy to clean the tips of the tips, and eliminating the difficulty of centering the air tubes. To generally provide a low melting point blow burner for dental technology which can be easily assembled without any trouble.

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

Reference numeral 1 denotes a small-diameter compressed air pipe, and a connector 1a is connected to a flexible hose (not shown) at the end of the pipe.
, and a flow rate control valve 1b is provided in the middle thereof. 2 is a natural gas pipe with a larger diameter than the compressed air pipe 1, which is installed directly below the compressed air pipe 1 at a predetermined interval via a fixture, and has a flexible hose ( (not shown), and a flow rate control valve 2b at a position corresponding to the flow rate control valve 1b midway therebetween. Reference numeral 3 denotes a bent tube fixed to the tips of both pipes 1 and 2, the outlet side 3a of which is bent downward, and a tip 4 at the tip of the burner can be detachably attached to the outer peripheral surface of the outlet side 3a of the bent tube 3. The threaded portion 3b is carved as shown in FIG. The tip 4 at the tip of the burner is arranged along the coaxial line of the cover cylinder 5, the intermediate cylinder 6 which is partially inserted and fixed in the cover cylinder 5, and the cover cylinder 5 and the intermediate cylinder 6. It is obtained by fixing together the air capillary tube 7 and the flange 8 having the through hole 8a. That is, the cover cylinder 5 is the outermost cylinder, and an annular cutout 5a is formed in the inner wall of the inner end of the cylinder 5. In order to insert and fit a part of the intermediate cylinder 6 into the cover cylinder 5 so that the tip of the intermediate cylinder 6 is in a position sufficiently recessed from the front end of the cover cylinder 5, for example, as shown in FIG. A screw portion 6b carved on a part of the outer circumferential surface of the intermediate cylinder 6 is screwed and fixed to a screw portion 5b carved on a part of the inner peripheral surface of the cover cylinder 5 as shown in FIG. Further, the tip of the intermediate cylinder 6 has a circular flange 6c bent inward as shown in the second figure, and air and air are supplied from a through hole 6d in the center surrounded by the circular flange 6c. It allows natural gas to pass through. The base 6a of the intermediate cylindrical body 6 is extended to the outside from the end of the cover cylindrical body 5, and the threaded part 6b on the inner circumferential surface of the extended base is directly screwed into the threaded part 3b of the bending tube 3, or As in this example, the connecting tube 9 is screwed into the threaded portion 3b on the outlet side of the bent tube 3, and the screwed portion 6b at the base of the intermediate cylinder 6 is indirectly connected to the connecting tube 9 via the connecting tube 9. They may be connected by screwing together. The air thin tube 7 is located on the same axis of the cover cylinder 5 and the intermediate cylinder 6 as shown in the second figure,
The tip of the air tube 7 is narrowed, and the tip of the air thin tube 7 is located at a portion corresponding to the inner surface of the circular collar body 6c at the tip of the intermediate cylinder 6. In addition, on the outer circumferential surface near the tip of the air thin tube 7, there are four through holes 8a arranged equally on the same circumference.
A flange 8 is formed along the axial direction,
The outer peripheral surface of the flange 8 is tightly fitted and fixed to the end portion of the inserted portion of the intermediate cylinder 6. The rear part of the air thin tube 7 protrudes outward from each base of the cover cylinder 5 and the intermediate cylinder 6, and can be attached to and detached from the tip of the compressed air pipe 1 on the outer peripheral surface of the base of the air thin tube 7. A threaded portion 7a is formed so as to be screwed into the threaded portion 7a. 10 is a core-shaped porous sintered metal that covers the outer peripheral surface of the tip of the air capillary tube 7;
The front end surface 10a of 0 is filled so as to come into contact with the inner surface of a circular flange 6c bent at the tip of the intermediate cylinder 6.

Since this invention has the above structure, to put it into practice, first hold the bases of the compressed air pipe 1 and the natural gas pipe 2 in your hands, and use your thumbs to open the flow rate control valve 2b on the natural gas pipe 2 side. ignite at the tip of the burner. Next, when the flow rate control valve 1b on the compressed air side is opened, the compressed air passes through the compressed air pipe 1 from the control valve 1b, and then passes through the air thin tube 7.
It will erupt from the narrowed part at its tip. As air is ejected from the tip of the air tube 7,
Natural gas is also attracted by this, and air and natural gas are rapidly stirred and mixed within the cover cylinder 5. That is, after passing through the natural gas pipe 2, the natural gas passes through the passage between the outer circumferential surface of the air thin tube 7 and the inner circumferential surface of the intermediate cylinder 6, and hits the flange 8. It is dispersed and released from the through holes 8a. The dispersed and released natural gas is further sent to a passage formed by the outer circumferential surface of the air capillary tube 7 and the inner circumferential surface of the intermediate cylinder body 6, and is passed through the porous sintered metal filled inside the tip of the intermediate cylinder body 6. Further finely dispersed natural gas is injected from the front end surface 10a of the intermediate cylinder 6 into the inner hole of the circular collar body 6 at the tip of the intermediate cylinder body 6 in a regulated state through a large number of fine holes in the intermediate cylinder body 6. As a result, the air and natural gas are sufficiently mixed within the cover cylinder 5, and the flame regulated by the inner hole of the circular collar body 6c is ejected from the tip of the cover cylinder 5.

As can be seen from the above explanation, this idea consists of a compressed air pipe and a natural gas pipe, each equipped with a flow rate control valve, and the tips of both pipes are joined by a bent pipe, and the pipes are connected through an intermediate cylindrical body. An air capillary with a constricted tip located at the center of the cover cylinder which is detachably connected to the bent tube is made to protrude outward from the bases of the cover cylinder and the intermediate cylinder, and on the outer circumferential surface of the base of the air capillary, A threaded portion is carved so as to be screwed into the tip of the compressed air pipe, and on the outer circumferential surface near the tip of the air capillary located inside the cover cylinder,
A flange having a plurality of through holes along the axial direction is formed, and the outer peripheral surface of the flange has a circular flange whose tip is bent inward, and has through holes through which air and natural gas pass. fixed to the inner wall of an intermediate cylindrical body provided at the center, covering the tip of the intermediate cylindrical body with a cover cylinder, and positioning the tip of the air thin tube at a portion corresponding to the inner surface of the circular flange at the tip of the intermediate cylindrical body; This is a low melting point blow burner for dental technology, which is made by filling the inside of the tip of an intermediate cylinder with porous sintered metal that covers the outer peripheral surface of the tip of the air tube. The centering of the capillary tube is ensured, and the air ejected from the air capillary located in the center of the cover cylinder and the natural gas primarily dispersed through the through holes in the flange are further transferred to the sintered metal around the tip of the air capillary tube. The natural gas ejected from the numerous microscopic pores is quickly and thoroughly stirred and mixed within the cover cylinder, which acts as a protective wall, without directly coming into contact with external wind, etc., and a completely combusted flame is injected. This eliminates wasteful consumption of gas. In particular, when injecting flame, the injection surface of the natural gas that is attracted to and ejected from the periphery of the air ejected from the center is regulated by the inner circumference of the circular flange at the tip of the intermediate cylinder. Since the hollow spaces equivalent to the surface area of This eliminates the inconvenience that would occur if the flame was thinned as in the past, and the fire would quickly go out due to the nature of natural gas.

Moreover, as mentioned above, this device has a tip at the tip of the burner that is connected to a cover cylinder, an intermediate cylinder which is partially inserted and fixed to the cover cylinder, and whose tip is filled with sintered metal, and the cover cylinder and the intermediate cylinder. The air tube is placed coaxially with the body and has a flange with a through hole on the outer circumferential surface near the tip.The structure is such that the three parts are fixed together, making it easy to clean by removing the tip at the tip of the burner. Not only is it easy to install and assemble, there is no need to worry about losing parts or worrying about centering the air tube. It can be said to be extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an embodiment of this invention, Fig. 2 is a cross-sectional view of the tip at the tip of the burner, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2, and Fig. 4 is a cross-sectional view of the chip at the tip of the burner. FIG. 2 is a right side view in FIG. 2; DESCRIPTION OF SYMBOLS 1... Compressed air pipe, 2... Natural gas pipe, 3... Bent pipe, 4... Chip, 5... Cover cylinder body, 6... Intermediate cylinder body, 6c... Circular collar body, 7
... air tube, 8 ... flange, 8a ... through hole, 10 ... sintered metal.

Claims (1)

[Scope of utility model registration request] A cover cylinder that is equipped with a compressed air pipe and a natural gas pipe, each equipped with a flow rate control valve, where the tips of the two pipes are joined at a bent pipe, and which is removably connected to the bent pipe via an intermediate cylinder. An air capillary with a constricted tip located in the center of the body is made to protrude outward from the bases of the cover cylinder and the intermediate cylinder, and is screwed onto the outer peripheral surface of the base of the air capillary with the tip of the compressed air pipe. A threaded portion is carved as shown in FIG. It is fixed to the inner wall of an intermediate cylindrical body, which has a circular flange whose tip is bent inward and has a through hole in the center that allows air and natural gas to pass through, and the tip of the intermediate cylindrical body is attached to a cover cylinder. The tip of the air capillary is positioned at a portion corresponding to the inner surface of the circular flange at the tip of the intermediate cylindrical body, and the inside of the tip of the intermediate cylindrical body is filled with porous sintered metal that covers the outer peripheral surface of the tip of the air capillary. Low melting point blow burner for dental technology.