JPS636585Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high melting point blow burner for dental technology that utilizes natural gas and is used for melting dental metal crowns and the like.

Conventionally, this kind of high melting point blow burner for dental technology that uses natural gas has been constructed with several parts assembled one by one so that the chip at the tip of the burner that mixes natural gas and air can be disassembled. This allows the burner to be cleaned appropriately 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 this and blows out from the surroundings mix and burn. If it is installed in the wrong position, the natural gas and air will not be sufficiently mixed and will burn incompletely, leading to disadvantages such as wasting gas or not being able to obtain a burner with a high melting point. It was hot.

In addition, metal crowns are usually made of gold-palladium alloys, silver alloys, etc., so when these alloys are melted in a natural gas-fueled burner, they tend to overheat and melt. Metal tooth crowns had the disadvantage that the metal with a low melting point burns first due to the strong firepower of natural gas, leaving that part porous.

This idea was made to eliminate the above-mentioned drawbacks, and its purpose was to create a structure that allows for good mixing of natural gas and air, so that the flame does not go out regardless of the high melting point, and the flame does not go out. In addition to being adjustable, the tip at the tip of the burner has an integral structure with the air tube and gas flow path parts so that the air tube is always located in the center, and the entire tip at the tip of the burner is connected to the compressed air pipe and the natural gas pipe. An object of the present invention is to generally provide a high melting point blow burner for dental technology which can be detachably attached to a bent pipe that joins the ends of both pipes of a dental pipe.

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 connected to a cover cylinder 5, an intermediate cylinder 6 which is partially inserted into and fixed to the cover cylinder 5, and a through hole extending along the coaxial line of the cover cylinder 5 and the intermediate cylinder 6. 8
It is obtained by fixing together the air capillary tube 7 and the flange 8 having a flange 8. That is, the cover cylindrical body 5 is the outermost cylindrical body, and an annular notch 5a is formed in the inner wall of the distal end of the cylindrical body 5. The intermediate cylindrical body 6 has an annular shape on the outer circumferential wall of the intermediate portion of the intermediate cylindrical body 6 such that its tip is located approximately in the middle of the cover cylindrical body 5, and its base 6a extends outside from the end of the cover cylindrical body 5. A flange body 6b is formed, and the outer circumferential surface of the flange body 6b is tightly fitted and fixed to the annular notch 5a. Intermediate cylinder body 6
The distal end surface 6c is narrowed as shown in the second figure, and there is a through hole for the air thin tube 7 in the center of the distal end surface 6c.
In addition, a through hole 6d serving as a gas passage hole is formed, and a plurality of gas through holes 6e are formed in the peripheral wall of the distal end portion of the intermediate cylinder body 6 located forward of the annular collar body 6b.
As shown in the second figure, the air thin tube 7 has a narrowed tip and protrudes outward from each base of the cover cylinder 5 and the intermediate cylinder 6, and the compressed air pipe is attached to the outer peripheral surface of the base of the air thin tube 7. A threaded portion 7a is formed so as to be removably screwed together with the tip of 1. A fine hole 7c is bored in the base peripheral wall 7b of the air tube 7 so that a part of the air in the air tube 7 is released into the natural gas passing through the bent tube 3.
The air capillary 7 has a flange 8 formed on the outer peripheral surface of the air capillary 7 so as to be located on the same axis of the cover cylinder 5 and the intermediate cylinder 6, and has four through holes 8a equally arranged on the same circumference. The outer peripheral surface of the flange 8 is tightly fitted and fixed to the inner peripheral wall of the intermediate cylinder 6 at a position corresponding to the annular flange 6b, so that the tip of the air thin tube 7 is located inside the cover cylinder 5.

Since this invention has the above-mentioned 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, close the flow rate control valve 1b on the compressed air side with your thumbs, and then Open the flow control valve 2b on the gas side and 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, passes through the air thin tube 7, and most of it blows out from the narrowed part at the tip. However, a part of it is released from the fine holes 7 into the gas passing through the bent tube 3. As the air is ejected from the tip of the air tube 7, natural gas is also attracted thereto, and the 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 mixes with some air ejected from the fine holes 7c of the air capillary tube 7 in the bent pipe 3, and passes through the outer circumferential surface of the air tube 7 and the inner circumferential surface of the intermediate cylinder 6. It hits the flange 8 through the passage between the two, and is dispersed and released from four through holes 8a formed in the flange 8. The dispersed and released natural gas is further distributed between the outer peripheral surface of the air capillary tube 7 and the intermediate cylinder body 6.
The gas flow changes here, and one is the gap between the outer circumferential surface of the air capillary tube 7 and the through hole 6d in the distal end surface of the intermediate cylinder 6. the other is emitted concentrically through the intermediate cylinder 6
The gas is released radially through the gas through hole 6e in the peripheral wall of the tip end, and this gas hits the inner peripheral wall of the cover cylinder 5 and becomes a swirling flow, which is combined with the air released in the axial direction and some natural gas. As a result, stirring and mixing are quickly performed, and a powerful flame 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 tube with a constricted tip located at the center of the cover cylinder connected to the bent pipe is made to protrude outward from the base of the cover cylinder, and the tip of the compressed air pipe is attached to the outer peripheral surface of the base of the air capillary. A threaded portion is formed so as to be screwed together with the air tube, and a fine hole is bored in the peripheral wall of the base of the air tube, and a hole is formed along the axial direction on the outer peripheral surface of the air tube located in the cover cylinder. forming a flange having a plurality of through holes, and fixing the outer circumferential surface of the flange to an inner wall of an intermediate cylinder whose distal end surface is a through hole of an air capillary and is provided with a through hole that serves as a gas passage hole; A gas through hole is formed in the peripheral wall of the distal end of the intermediate cylinder, and a circular flange is formed on the outer peripheral surface of the intermediate cylinder, and the outer peripheral surface of the flange is connected to the inner wall of the base of the cover cylinder. Since this is a high-melting-point blow burner for dental technology, the air tube can be reliably centered at all times by simply attaching the tip at the tip of the burner to the bent tube. The jetting gas from the donut-shaped through hole surrounding the jetting air and the swirling gas around it are sufficiently stirred and mixed rapidly and completely, resulting in a powerful flame that burns completely. This eliminates wasteful consumption of gas.

In addition, some of the air ejected from the fine holes of the air tube located inside the bent tube is mixed with the natural gas in advance, and the air and natural gas are sufficiently mixed at the tip of the air tube. The fact that the tip portion is sufficiently covered with the cover cylinder means that when melting the dental metal alloy, it can be melted at an appropriate temperature without melting under overheating conditions, making it possible to melt the dental metal alloy at an appropriate temperature, unlike the conventional porous metal alloy. When you have a metal crown made, you will never have to worry about scratches. Moreover, as described above, this device is designed so that the tip at the tip of the burner passes through the cover cylinder, the intermediate cylinder which is partially inserted and fixed in the cover cylinder, and the tip passes through the cover cylinder and the intermediate cylinder along the coaxial line. Since the three parts, including the air tube with a flange with holes, are fixed together, not only can the tip at the tip of the burner be removed and cleaned easily, but it is also extremely easy to install and assemble, so there is no chance of losing any parts. It has various excellent effects such as not having to worry about the centering of the air tube or the centering of the air tube, and can be said to have extremely great practical value in this type of industrial field.

[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, 6b... Annular collar body, 6
d...Through hole, 6e...Through hole for gas, 7...Air tube, 8...Flange, 8a...Through hole.

Claims (1)

[Scope of utility model registration request] A compressed air pipe and a natural gas pipe, each equipped with a flow control valve, are installed together, and the tips of both pipes are joined at a bent pipe, and the center of the cover cylinder is connected to the bent pipe via an intermediate cylinder. An air capillary with a constricted tip located at a portion thereof is made to protrude outward from the base of the cover cylinder, and a threaded portion is carved on the outer peripheral surface of the base of the air capillary so as to be screwed into the tip of the compressed air pipe. , a fine hole is bored in the peripheral wall of the base of the air capillary, and a flange having a plurality of through holes along the axial direction is formed on the outer peripheral surface of the air capillary located in the middle of the cover cylinder; The outer circumferential surface of the flange is fixed to the inner wall of the intermediate cylinder, the distal end of which is a through hole for the air capillary, and which is provided with a through hole for gas passage. A high-melting-point blow burner for dental technology, comprising a hole bored, a circular flange formed on the outer peripheral surface of the intermediate cylindrical body, and the outer periphery of the flange secured to the inner wall of the base of the cover cylindrical body.