JP2005337535A - Bunsen burner - Google Patents

Abstract

【Task】
Provided is a bunsen burner that can be easily ignited, can obtain a combustion flame with a stronger heating power than before, can direct the direction of the combustion flame at any angle as a stationary type, and can also be used as a hand-held burner.
[Solution]
A bunsen burner body is composed of a cylinder and a base body connected to the cylinder, and an ignition discharge rod is provided near the tip of the cylinder, and an air intake hole and a combustion gas jet are used to obtain a strong burning flame. The diameter of the nozzle and the like are specified, and the inner air mixed gas flow passage formed inside the cylinder is gradually reduced in inner diameter toward the tip of the cylinder, and is continuously connected to the rear end of the base body. The gripping body was configured to be detachable with respect to the base plate.
[Selection] Figure 1

Description

  The present invention relates to a Bunsen burner, and more particularly to a Bunsen burner that can be used for both dental and handicrafts.

One of the instruments used by dental technicians is the Bunsen burner. This Bunsen burner is a tool used by dental technicians when making gingiva parts with wax (meaning “wax” for denture action, the same shall apply hereinafter) in the process of making dentures. It is used to heat various technical equipment such as, and melt the wax itself. Furthermore, it is installed in a dental treatment unit or the like and used for medical treatment.
A typical example of a Bunsen burner conventionally used will be described below with reference to FIG. FIG. 6 is a perspective view of a conventional Bunsen burner. As shown in FIG. 6, a Bunsen burner 500 includes a base plate 501, a bottomed cylindrical body 502 that is erected on the base plate 501, and has a free end. A gas supply pipe 504 that supplies combustion gas to a combustion gas injection nozzle 503 disposed at the bottom of the cylinder 502, and is interposed between the cylinder 502 and the gas supply pipe 504, and communicates with a gas adjustment valve (not shown). The gas stopper 505 is provided. And the front-end | tip part of the cylinder 502 is comprised as a double pipe of the same axis line, and the double air mixed gas flow path is formed. An air intake hole 506 is formed in the cylindrical body 502 in the vicinity of the ejection nozzle 503, and an air intake adjustment ring 507 in which an air intake adjustment hole having the same diameter as the air intake hole 506 is formed is a cylindrical body. It is fitted in the vicinity of the bottom of 502 so as to be rotatable.

  When the Bunsen burner 500 is ignited, first, the gas main stopper is opened, the gas stopper 505 is rotated clockwise, and an ignition tool such as a lighter is brought close to the tip of the cylindrical body 502 to ignite. The heat power of the Bunsen burner 500 is adjusted by the gas adjustment knob 505 and the air intake adjustment ring 507. That is, when a strong heating power that melts wax is required, the gas adjustment knob 505 is further rotated clockwise to fully open, and the air intake adjustment ring 507 is rotated to enable the air intake hole. When the area is maximized, the combustion flame of the Bunsen burner 500 is a premixed flame having a reducing flame at the center and surrounding the oxidizing flame, and a strong heating power is obtained.

  By the way, in the manufacturing process of dentures, the bunsen burner is not continuously used, and the bunsen burner is frequently required. In such a case, it is not efficient to extinguish the combustion flame of the Bunsen burner in each case, and the combustion flame is often weakened temporarily by operating the gas plug 505 and the air intake adjustment ring 507. Since the operation of “temporarily weakening the combustion flame” is also performed by adjusting the gas stopper 505 and the air intake adjustment ring 507, the operation is relatively complicated, and a Bunsen burner incorporating a seeding mechanism is also manufactured. . The seed-fire mechanism is provided with a gas-flow passage for a seed fire that is separate from the air-mixed gas-flow passage formed by the cylinder, and the tip of the gas-flow passage for the seed fire is positioned near the tip of the cylinder. Whenever a bunsen burner is used, gas is burned with a weak heating power at the tip of the gas flow passage for the seed fire. And when the Bunsen burner is temporarily unnecessary, instead of “temporarily weakening the combustion flame” at the tip of the cylinder, only the combustion flame at the tip of the cylinder is extinguished by closing the gas stopper. Yes.

  In the melting operation of wax, it is common practice to place a wax-dissolving dish above the Bunsen burner and heat the dish to melt the wax in the dish. Sometimes it hangs down in the Bunsen burner crater and blocks the air-mixed gas flow path. In order to prevent this, and in the manufacturing process of dentures, it may be necessary to heat various technical equipment such as a spatula and a heat transfer rod, or to apply a combustion flame to any other location. Therefore, a hand-held burner may be used as necessary. There is also a demand for shortening the melting time of wax.

  In view of the above-mentioned background, the invention of a Bunsen burner that can be used as a hand-held burner is disclosed in Japanese Patent Laid-Open No. 2001-112789, and is shown in FIG. FIG. 7A is a side view of the Bunsen burner, and FIG. 7B is a cross-sectional view of the main part of the Bunsen burner cut along the axis.

  As shown in FIG. 7, the Bunsen burner 610 includes a base 612, a column 614 that stands vertically from the center of the base 612, and a cylinder 616 attached to the column 614, and the cylinder 616 is a ball 622. Is connected to the support column 614. The cylinder 616 includes therein a small-diameter air passage 632 extending along the axis, and a combustion gas passage 634 disposed around the air passage 632, and the air passage 632 is a cylinder. A combustion gas passage 634 is formed by an outer peripheral surface of the small diameter tube 636 and an inner wall 616a of the cylindrical body 616 spaced from the outer peripheral surface. In addition, a heat-resistant cylindrical body 646 made of a metal mesh is attached to the front end portion of the cylindrical body 616, and an inner / outer double hose 638 is connected to the rear end of the cylindrical body 616, and air is supplied by the inner pipe. Is supplied and gas is supplied through the outer pipe.

The invention according to Japanese Patent Application Laid-Open No. 2001-112789 having the above-described configuration is “can make a stronger flame than before”, “place the Bunsen burner 610 on a table and tilt the cylinder 616 diagonally downward. It is possible to overheat directly towards the wax in the ball (or abbreviated) ", and" the Bunsen burner 610 can be lifted and used instead of a hand-type torch " It is what you play.
JP 2001-112789 A

  However, the conventional Bunsen burner shown as the first example requires a lighter or other igniter when igniting, and the lighter is not always carried around, and it is often the case that the Bunsen burner starts to use. . Also, in the Bunsen burner with a seed igniter, even if the operation is interrupted for a relatively long time, the igniting operation of the Bunsen burner is troublesome, and therefore the seed fire is often kept on.

  Further, the bunsen burner disclosed in the Japanese Patent Application Laid-Open No. 2001-112789 is sufficient as the melting power (heat amount) of the wax as described above. The same shall apply hereinafter.) However, the thermal power required for the melting and processing of other metals is still one step, and it was not sufficient. Further, due to the characteristics of the ball joint mechanism in which the balls 622 constituting the Bunsen burner 610 are interposed, the cylindrical body 616 cannot be used in a vertical state when used in a stationary manner.

  Therefore, the present invention is easy to ignite, can obtain a powerful combustion flame that is more effective in melting metal such as soot than before, and directs the combustion flame to any angle as a stationary type The purpose is to provide a Bunsen burner that can be used as a hand-held burner and has many functions.

In order to solve the above problems, a Bunsen burner according to claim 1 of the present application includes a base plate base, a bottomed cylindrical body that is freely erected on the base at a predetermined inclination, and the cylindrical body. An inner air mixed gas flow passage formed inside, an outer air mixed gas flow passage surrounding the inner air mixed gas flow passage formed in a double tube structure at a tip portion of the cylindrical body, and the outer air mixing A communication hole communicating with the inner air mixed gas flow passage and the outer air mixed gas flow passage formed in a base portion of the gas flow passage; a combustion gas jet nozzle and air disposed at a bottom of the cylindrical body; An intake hole, the combustion gas injection nozzle communicated with a combustion gas flow passage formed in the base, and a combustion gas on-off valve interposed in an intermediate portion of the combustion gas flow passage, The inner air mixed gas flow passage is the cylinder The inner diameter is gradually reduced from the inner bottom portion toward the tip of the cylindrical body, and a first inner air mixed gas flow passage, a second inner air mixed gas flow passage, and a third inner air mixed gas flow passage are provided. It is formed.
The invention according to claim 2 of the present application is characterized in that, in the Bunsen burner according to claim 1, an ignition discharge rod is provided near the tip of the cylindrical body.
Furthermore, the invention according to claim 3 of the present application is the bunsen burner according to claim 1 or claim 2, wherein the bunsen burner is inserted through the insertion hole disposed in the center of the base plate base and is freely inserted into and removed from the insertion hole. A round bar-shaped gripping portion, and the bunsen burner is inserted in a detachable manner.
The invention according to claim 4 of the present application is characterized in that, in the bunsen burner according to claims 1 to 3, the bunsen burner is pivotally supported by the grip portion.
The invention according to claim 5 of the present application is characterized in that, in the Bunsen burner according to any one of claims 1 to 4, the gas stopper for operating the gas on-off valve is of a lever type.
Furthermore, the invention according to claim 6 of the present application is the bunsen burner according to any one of claims 1 to 5, wherein a igniter gas flow is provided outside the cylinder to form a igniter gas flow passage. A pipe is provided, the tip of the seed gas flow pipe is positioned in the vicinity of the tip of the cylindrical body, and a rear end of the seed gas flow passage is provided with a seed fire mechanism connected to the combustion gas flow passage. It is characterized by that.
According to claim 7 of the present invention, in the Bunsen burner according to claims 1 to 6, the other end of the combustion gas flow passage is connected to a portable gas cylinder.
Further, in the invention according to claim 8 of the present application, in the Bunsen burner according to any one of claims 1 to 7, when a 13A specification city gas is used as the combustion gas, the nozzle diameter of the combustion gas jet nozzle is substantially 0. 1 or 3 mm to 0.5 mm, more preferably 0.3 mm to 0.4 mm, and the air intake hole having a diameter of about 6.0 mm to 11.0 mm, more preferably 6.0 mm to 8.0 mm. 2 places, more preferably 2 places, the first inner air mixed gas flow path diameter is about 9.0 mm, the second inner air mixed gas flow path diameter is about 5.0 mm, and the third The inner air mixed gas flow passage has a diameter of about 4.0 mm, the outer air mixed gas flow passage has a flow passage width of about 1.0 mm to 2.0 mm, and a diameter of about 1.7 mm. Features that installed To.

  The Bunsen burner according to each claim of the present application includes a base plate base, a bottomed cylindrical body that is freely erected on the base at a predetermined inclination, and an inner air mixed gas formed inside the cylindrical body. A flow passage, an outer air mixed gas flow passage that surrounds the inner air mixed gas flow passage formed in a double tube structure at the tip of the cylindrical body, and a base portion of the outer air mixed gas flow passage. A communication hole communicating the inner air mixed gas flow passage and the outer air mixed gas flow passage, a combustion gas jet nozzle and an air intake hole disposed at the bottom of the cylinder, and the base body. The combustion gas injection nozzle communicated with the formed combustion gas flow passage, the combustion gas on-off valve interposed in the middle portion of the combustion gas flow passage, and an ignition device attached near the tip of the cylindrical body A discharge rod; and the inner air mixing The internal flow passage is narrowed stepwise from the bottom of the cylindrical body toward the tip of the cylindrical body, and the first inner air mixed gas flow passage, the second inner air mixed gas flow passage, and the third inner side Since the air-mixed gas flow passage is formed, a combustion flame having a higher combustion temperature than the conventional Bunsen burner is obtained, and a strong thermal power (heat amount) sufficient to dissolve metal such as soot is obtained. .

Although the experimental results will be described in detail later, the thermal power of the Bunsen burner depends on the combustion gas used, the nozzle diameter of the combustion gas ejection nozzle, the shape of the air intake hole, the inner air mixed gas flow passage and the outer air mixed gas flow By making the shape of the road appropriate, the reducing flame at the center is smaller than before, the oxidizing flame surrounding the reducing flame is also shorter than before, and it is suitable for fine processing work that can not be done with the conventional Bunsen burner There is a unique effect.
Although detailed knowledge is not clear, this 13A combustion gas is compared to the 13A city gas specification that is normally obtained by narrowing the inner diameter of the inner air mixed gas flow passage gradually toward the tip of the cylinder. When the air mixture is mixed and preheated better than before and the air mixture gas burns, the reducing flame at the center is shorter than before, and the oxidizing flame surrounding the reducing flame is also shorter than before. It is speculated that the combustion temperature will rise.

  Further, since the bunsen burner according to each claim of the present application is provided with an ignition discharge rod in the vicinity of the tip of the cylindrical body, it is not necessary to prepare a separate igniter, and when using the bunsen burner, (1 It can be ignited by only two operations: opening the gas stopper, and (2) pressing the push button of the piezoelectric igniter. Since it can be ignited by such a simple operation, even if it is equipped with a seed fire mechanism, it will often extinguish the seed fire and the combustion flame without leaving the state where the fire is on. , Combustion gas consumption is also reduced.

  In the bunsen burner according to each claim of the present application, the round bar-shaped gripping portion connected to the rear end of the bunsen burner main body can be freely inserted into and removed from the insertion hole of the base plate. The burner can be used as a hand-held burner, and the Bunsen burner in a state of being attached to the base plate can be used as a stationary burner.

  Further, the bunsen burner according to each claim of the present application is such that the bunsen burner body is pivotally supported by the gripping portion so that the gripping portion is held vertically when used as a stationary burner. On the other hand, by rotating the Bunsen burner main body, the tip of the cylinder can be used in a posture inclined obliquely downward. Also, when used as a hand-held burner, the cylindrical body can be used in a posture in which the tip of the cylinder is inclined obliquely downward with the gripping portion held vertically. Furthermore, since the gripping part is connected on the same axis as the Bunsen burner body, the axis of the cylinder can be tilted at an arbitrary angle between −30 degrees and +135 degrees with respect to the horizontal.

  In addition, the Bunsen burner according to each claim of the present application uses a lever-type gas stopper, so unlike a knob-type gas stopper, the opening and closing operation of the gas stopper can be easily performed using a part of one hand even when both hands are closed. Can do.

  And, since the bunsen burner according to each claim of the present application has a seed fire mechanism, if the combustion flame of the bunsen burner is not used for a very short time, only the combustion flame of the bunsen burner is extinguished with the seed fire turned on. It is possible to smoothly move to the next process using the combustion flame. Work that does not use the Bunsen burner's combustion flame for an extremely short period of time frequently occurs. Therefore, it is more economical and safer than leaving the Bunsen burner's combustion flame on. Become.

  In addition, since the bunsen burner according to each claim of the present application uses a portable gas cylinder, it becomes a portable bunsen burner that can be used even in a place without a gas supply facility. It can also be extended to the handicraft field that requires brazing.

In the invention according to claim 7, although the portable gas cylinder is connected to the other end of the combustion gas flow passage, it is also possible to incorporate the gas cylinder in the base plate itself, and in this case, the built-in gas cylinder It is also possible to use a cartridge type in which the gas cylinder can be attached and detached, or a cylinder gas injection type in which a gas filling space is provided in the base plate.
If comprised in this way, the convenience as a portable Bunsen burner will further increase.

First, among the best modes for carrying out the present invention, the Bunsen burner of the first embodiment will be described in detail with reference to FIGS. FIG. 1 is a perspective view of the Bunsen burner according to the first embodiment, FIG. 2 is a sectional view of the Bunsen burner cut along the axis, and FIG. 3 is a posture in which the tip of the Bunsen burner is inclined obliquely. FIG.
1 and 2, reference numeral 10 is a Bunsen burner according to the present embodiment, reference numeral 20 is a cylinder, reference numeral 21 is an outer pipe, reference numeral 22 is an inner pipe, reference numeral 23 is an inner air mixed gas flow path, and reference numeral 23a is a first passage. 1 is an inner air mixed gas flow path, reference numeral 23b is a second inner air mixed gas flow path, reference numeral 23c is a third inner air mixed gas flow path, reference numeral 24 is an outer air mixed gas flow path, and reference numeral 25 is a communication pipe. , 26 is an air intake adjustment ring, 27 is an air intake adjustment hole, 28 is an air intake hole, 29 is a combustion gas ejection nozzle, 30 is a base, 31 is a combustion gas flow path, 32 Is a combustion gas on-off valve, numeral 33 is a gas stopper, numeral 34 is a combustion gas pipe connection part, numeral 35 is a combustion gas pipe, numeral 40 is a piezoelectric igniter, numeral 41 is an ignition tool body, numeral 42 is a discharge rod, numeral 43 is a push button, 50 is a bun Nbana gripper, reference numeral 51 is communicated rod, reference numeral 52 is gripping the insertion portion, reference numeral 60 denotes a base plate.

As shown in the figure, a Bunsen burner 10 according to this embodiment includes a cylindrical body 20, a base body 30 connected to the base end portion of the cylindrical body 20, and a piezoelectric igniter 40 attached to the cylindrical body 20. And a base plate 60 and a Bunsen burner holding body 50 on the same axis as the Bunsen burner main body composed of the cylindrical body 20 and the base body 30.
The cylindrical body 20 is a bottomed cylindrical body with an open front end, and the cylindrical part has a double structure of an outer tube 21 and an inner tube 22, and the inner peripheral surface of the outer tube 21 and the outer periphery of the inner tube 22. It is in close contact with the surface. The outer diameter of the inner tube 22 is reduced at the tip of the cylindrical body 20, and the second inner air mixed gas flow passage 23 b and the third inner air mixed gas are provided between the outer tube 21 and the inner tube 22. A space formed so as to surround the flow passage 23 c is an outer air mixed gas flow passage 24, and four communication pipes 25 are equidistantly arranged at the root portion of the outer air mixed gas flow passage 24. It is penetrated by.

  The inner air mixed gas flow passage 23 has a first inner air mixed gas flow passage 23a and a second inner air mixed gas that are gradually reduced in inner diameter from the bottom in the cylindrical body 20 toward the tip of the cylindrical body 20. A flow passage 23b and a third inner air mixed gas flow passage 23c are formed. And the flow path length of the 2nd inner side air mixed gas flow path 23b is the longest, the flow path length of the 1st inner side air mixed gas flow path 23a follows this, and the 3rd inner side air mixed gas flow path The flow passage length of 23 c is formed to be the shortest, and the four communication pipes 25 communicate between the second inner air mixed gas flow passage 23 b and the outer air mixed gas flow passage 24.

In addition, two air intake holes 28 are provided in the inner tube 22 at equal intervals in the vicinity of the bottom of the cylindrical body 20. That is, the two air intake holes 28 are formed so as to communicate the first inner air mixed gas flow passage 23a with the outside.
The outer tube 21 in the vicinity of the air intake hole 28 is an air intake adjustment ring 26 that is rotatably fitted to the inner tube 22. The air intake adjustment ring 26 is also provided with two air intake adjustment holes 27 having the same diameter as the air intake hole 28. By rotating the air intake adjustment ring 26, the air intake adjustment ring 26 is rotated. The area of the overlapping portion of the hole 28 and the air intake adjustment hole 27 is increased or decreased so that the effective air intake area of the air intake hole 28 can be changed. A combustion gas ejection nozzle 29 is disposed at the center of the bottom of the cylindrical body 20.

  The base body 30 connected to the base end portion of the cylindrical body 20 has an end portion facing the cylindrical body 20 pivotally supported by one end of a continuous rod 51 constituting the Bunsen burner gripping body 50, One end extending in a direction orthogonal to the intermediate region between the base end portion of the cylindrical body 20 and the end portion facing the cylindrical body 20 is a combustion gas pipe connecting portion 34 in which a groove for preventing escape is formed. , Connected to the combustion gas pipe 35. The combustion gas ejection nozzle 29 and the combustion gas pipe connection 34 communicate with each other through a combustion gas flow passage 31 formed in the Bunsen burner support 30. A valve 32 is interposed. The combustion gas on / off valve 32 is opened / closed by a gas plug 33.

  A piezoelectric igniter 40 attached to a Bunsen burner body composed of a cylindrical body 20 and a base body 30 is composed of an igniter body 41, a discharge rod 42, and a push button 43, and projects from the tip of the igniter body 41. The tip of the discharge bar 42 provided is fixed to the Bunsen burner body so as to be positioned at the tip of the cylindrical body 20.

  The Bunsen burner gripping body 50 is composed of a continuous rod 51 and a round bar-shaped gripping insertion portion 52. One end of the continuous rod 51 is pivotally attached to the base body 30 by a bolt 53a, and the other end is fixed to the grip insertion portion 52 by a bolt 53b. It is attached to the shaft. That is, the base body 30 is rotatable with respect to the gripping insertion portion 52 via the linkage 51. Further, the other end of the gripping insertion portion 52 not shown is inserted into an insertion hole (not shown) formed in the base plate 60 so as to be freely inserted and removed. The Bunsen burner main body composed of the cylindrical body 20 and the base body 30 can be rotated by loosening the bolts 53 that fix the shaft-attached portions at both ends of the linkage 51. After determining the posture of the Bunsen burner main body, the bolts 53 Tighten to fix the posture of the Bunsen burner body. In this embodiment, the bunsen burner main body and the gripping insertion portion 52 are pivotally supported at two places, but one place may be fixed and the other one place may be pivotally supported.

  As described above, the base plate 60 has an insertion hole (not shown) in the center and is made of a relatively heavy metal so as to serve as a weight.

Next, the operation of the Bunsen burner 10 according to the present embodiment will be described.
When the handle of the gas plug 33 is operated to change the direction of the combustion gas on-off valve 32 from the direction perpendicular to the combustion gas circulation pipe 31 (the state shown in FIG. 2) to the same direction as the combustion gas circulation pipe 31 The gas is vigorously ejected from the combustion gas ejection nozzle 29 through the combustion gas flow passage 31 to the inner air mixed gas flow passage 23. The jetted combustion gas is released from the front end of the inner air mixed gas flow passage 23 to the outside through the inner air mixed gas flow passage 23 with the momentum. At this time, when the push button 43 of the piezoelectric igniter 40 is pressed, a flashing light is generated from the tip of the discharge rod 42 to the tip of the cylindrical body 20 to ignite the combustion gas.

Here, the combustion flame of the ignited combustion gas will be described.
When the combustion gas is ejected from the combustion gas ejection nozzle 29 to the inner air mixed gas flow passage 23, the overlap of the air intake adjustment ring 26 and the air intake hole 28 is eliminated, that is, the effective air intake area. Is set to zero, only the combustion gas is discharged to the outside from the tip of the inner air mixed gas flow passage 23. In this case, since oxygen necessary for combustion is supplied from the outside of the combustion flame, most of the combustion flame becomes an incomplete combustion reducing flame, and unburned substances become soot and become an air-inside air mixed gas flow passage 23. Released into the inside.

On the other hand, when the air intake adjustment ring 26 and the air intake hole 28 are closely overlapped, that is, when the effective area of the air intake is maximized, the combustion gas flows in the inner air mixed gas flow passage 23. It goes toward the tip of the cylinder 20 with air around it.
As described above, the inner air mixed gas flow passage 23 includes the first inner air mixed gas flow passage 23a, the second inner air mixed gas flow passage 23b, and the third inner air mixed gas flow passage 23c. However, the combustion gas ejected into the first inner air mixed gas flow passage 23a in the air atmosphere encounters and mixes with the air in the first inner air mixed gas flow passage 23a. A part of the air mixed gas flowing in the inner air mixed gas flow passage 23 a and mixed with the air flows into the outer air mixed gas flow passage 24 from the communication pipe 25, and from the tip of the outer air mixed gas flow passage 24. Most of the remaining air mixed gas is discharged from the tip of the third inner air mixed gas flow passage 23c.

  That is, the inside of the first inner air mixed gas flow passage 23a serves as a mixing space for the combustion gas and air, and the air mixing in which the combustion gas and air are mixed in the first inner air mixed gas flow passage 23a. The gas flows into the second inner air mixed gas flow passage 23b whose flow passage is narrowed to the tip of the second inner air mixed gas flow passage 23b while further increasing the degree of mixing of the combustion gas and air. And move on. And it discharge | releases outside through the 3rd inner side air mixed gas flow path 23c whose flow path was further narrowed.

A part of the air mixed gas in the second inner air mixed gas flow passage 23b is released from the outer air mixed gas flow passage 24, and this is from the tip of the third inner air mixed gas flow passage 23c. The air mixture gas to be released plays a role to make it released in a uniform shape without being diffused into the atmosphere.
Therefore, from the tip of the third inner air mixed gas flow passage 23c, the combustion gas and air are sufficiently agitated to release an elongated air mixed gas, and the air discharged from the outer air mixed gas flow passage 24 is discharged. Due to the mixed gas, the combustion flame according to the Bunsen burner of the present invention is shorter than before and has a vertically elongated shape, and the combustion temperature is as high as around 1,000 ° C.

  As described above, the shape of the combustion flame and the combustion temperature are determined according to the type of combustion gas, the nozzle diameter of the combustion gas ejection nozzle 29, the size and number of locations of the air intake holes 28 (air intake effective area), the first The diameter and length of the inner air mixed gas flow passage 23a, the diameter and length of the second inner air mixed gas flow passage 23b, the diameter and length of the third inner air mixed gas flow passage 23c, and the inside of the outer tube 23 It is considered that the distance varies between the peripheral surface and the outer peripheral surface of the inner tube 22 (the width of the outer air gas mixed flow passage) and the size and the number of locations of the communication tube 25.

Therefore, when the combustion gas to be used is a 13A specification city gas, the inventor sets the bunsen burner configuration to have a diameter and length of the first inner air mixed gas flow passage 23a of 9 mm and 11 mm, and the second The diameter and length of the inner air mixed gas flow passage 23b are 5 mm and 25.5 mm, and the diameter of the third inner air mixed gas flow passage 23c (the experimental results are shown in Table 1; ) And lengths of 4 mm, 5 mm and 1.5 mm, the width of the outer air gas mixed flow passage is 1.0 mm, and the nozzle diameter of the combustion gas jet nozzle 29 (in Table 1, simply "Nozzle diameter"), the diameter and number of locations of the air intake holes 28 (in Table 1, simply referred to as "diameter and number of locations of intake holes"), the diameter and number of locations of the communication pipe 25 (Table 1). In Simply performs various varied experiment in.) The "diameter and number portion of the communication pipe" was visually for appearance shape of the resultant combustion flame.
The experimental results are shown in Table 1.

  The column of nozzle diameter in Table 1 shows the shape of the combustion flame when the nozzle diameter is a numerical value. ◎ is “good shape”, ○ is “good shape”, and △ is “shape is not organized” “No”, “X” indicates a state where “the combustion flame does not become thin”, and “Translucent” indicates that the color of the combustion flame is blue that is almost transparent. Also, the column of the length of the combustion flame in Table 1 indicates the length from the crater to the tip of the combustion flame when the nozzle diameter is each numerical value, and “thick” indicates that the combustion flame is different from other combustion flames. It shows that it was a little thicker than that.

  From Table 1, the nozzle diameter of the combustion gas ejection nozzle 29 is more preferably 0.3 mm to 0.4 mm, and the diameter of the air intake hole 28 is more preferably 6.0 mm to 8.0 mm. The number of intake holes 28 is preferably two. Moreover, it turns out that it is preferable that the diameter of the 3rd inner side air mixed gas flow path 23c is 4.0 mm. In this case, the length of the combustion flame is approximately 30 mm to 32 mm.

Next, in order to verify the thermal power of the combustion flame of the Bunsen burner, a melting comparison experiment with the conventional Bunsen burner shown in FIG.
The Bunsen burner according to the present invention in this experiment has a diameter and length of the first inner air mixed gas flow passage 23a of 9 mm and 11 mm, and a diameter and length of the second inner air mixed gas flow passage 23b of 5 mm and The diameter and length of the third inner air mixed gas flow passage 23c are 4 mm and 1.5 mm, the width of the outer air gas mixed flow passage is 1.0 mm, and the nozzle diameter of the combustion gas ejection nozzle 29 is 25.5 mm. Was 0.35 mm, the diameter and the number of locations of the air intake hole 28 were 8 mm and 2 locations, and the diameter and the number of locations of the communication pipe 25 were 1.7 mm and 4 locations.

In the dissolution comparison experiment, a porcelain baking dish having an internal volume of 25 × 35 × 2.5 (unit: millimeter) was placed above the Bunsen burner, and 28 × 36 × 5 (on the porcelain baking dish to prevent uneven combustion temperature. A carbon sheet (unit: millimeter) was placed, and a sample was placed thereon and heated.
Table 2 shows the types of target samples, and Table 3 shows the results of dissolution experiments.

  The results in Table 3 are all data for the Bunsen burner of this example. In the Bunsen burner of this example, both K20 鑞 and dental silver iron were dissolved in about 14 seconds, and 1 g of gold-silver-palladium alloy was obtained. The sample was dissolved by heating for 2 minutes. On the other hand, when the conventional Bunsen burner was used, the sample did not dissolve even when heated for 300 seconds or more.

  Here, based on FIG. 3, a case where the crater, that is, the tip of the cylindrical body 20 is inclined and used will be described. 3, the same elements as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted. 3A and 3B are posture views of the Bunsen burner 10, in which FIG. 3A is a posture view in which the tip of the cylindrical body 20 is inclined obliquely upward, and FIG. 3B is a posture in which the tip of the cylindrical body 20 is inclined obliquely downward. In the figure, symbol α in the figure is the elevation angle of the cylinder 20, and symbol β is the depression angle of the cylinder 20.

  As described above, the posture of the Bunsen burner main body composed of the cylindrical body 20 and the base body 30 can be changed by the bolts 53 that fix the shaft attachment portions at both ends of the linkage 51, as shown in FIG. The elevation angle α formed between the horizontal line and the Bunsen burner body can be rotated from 0 degrees to 135 degrees, and the depression angle β formed between the horizontal line and the Bunsen burner body is 0 degrees to 30 degrees as shown in FIG. And can be fixed at any position within the above range.

  The Bunsen burner 10 according to the present embodiment can be used as a hand-held type, and can cope with any work that requires a burner in the manufacturing process of dentures performed by a dental technician. Also, conventionally, in the wax melting operation, a melting plate was placed above the Bunsen burner to melt the wax in this plate, but the plate was placed on the work table and the Bunsen burner body was tilted downward. You can also melt the wax in this dish in a tilted position.

  Next, the Bunsen burner of the second embodiment will be described with reference to FIG. 4, the same elements as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted. FIG. 4 is a perspective view of the Bunsen burner of the second embodiment. Reference numeral 11 is a Bunsen burner of this embodiment, reference numeral 34 is a lever type gas stopper, reference numeral 61 is a base plate, and reference numeral 70 is a portable gas cylinder. The Bunsen burner according to the present embodiment emphasizes portability, and there is essentially no difference in function and operation from the Bunsen burner according to the first embodiment that emphasizes ease of use. Only the point will be described.

  The lever-type gas plug 34 has a large grip portion, and can be operated on the back of the hand without using a finger even when both hands are closed, and is designed to be used by anyone. That meets the requirements of universal design. Further, the discharge rod 42 of the piezoelectric igniter 40 is disposed inside the cylinder 20 and is different from the so-called externally attached first embodiment. This is because the discharge rod 42 is prevented from being damaged when being carried. And since the push button 43 is a push type, even if it operates the push button 43 for ignition, there is no fear that the Bunsen burner 11 will lie down. Furthermore, the base plate 61 is also lighter than the Bunsen burner 10 according to the first embodiment in consideration of portability.

  And since the portable gas cylinder 70 is used as a supply source of the combustion gas, it can be used even in a place without a gas supply facility, and the bunsen burner according to the present invention is used in many fields other than dental technicians. It becomes possible to do.

Incidentally, FIG. 5 is a perspective view of a Bunsen burner of another embodiment according to the second embodiment.
The bunsen burner shown in FIG. 5 and the bunsen burner shown in FIG. 4 have substantially the same configuration, but the main difference is that the bunsen burner shown in FIG. 4 has a separate portable gas cylinder 70 as a component. On the other hand, the Bunsen burner shown in FIG. 5 is that a gas cylinder is built in the base plate 62 itself.

Therefore, the Bunsen burner shown in FIG. 5 has a built-in combustion gas flow passage that allows the gas cylinder and the Bunsen burner to communicate with each other, and does not require an external combustion gas pipe. The capacity of the built-in gas cylinder is smaller than that of the portable gas cylinder 70 used in the Bunsen burner shown in FIG. For this reason, it is suitable for short-time work.
As described above, it is possible to adopt a cartridge type in which a built-in gas cylinder can be attached and detached, or a cylinder gas injection type in which a gas filling space is provided in the base plate.

FIG. 1 is a perspective view of a Bunsen burner according to the first embodiment. FIG. 2 is a cross-sectional view of the Bunsen burner cylinder according to the first embodiment cut along an axis. FIG. 3 is a posture diagram in which the cylinder of the Bunsen burner according to the first embodiment is inclined obliquely, and FIG. 3A is a posture diagram in which the tip of the cylinder is inclined obliquely upward, and FIG. Is a posture diagram with the tip of the cylinder tilted diagonally downward FIG. 4 is a perspective view of a Bunsen burner according to the second embodiment. FIG. 5 is a perspective view of a Bunsen burner according to another embodiment of the second embodiment. FIG. 6 is a perspective view of a conventional Bunsen burner. FIG. 7 is a view of the Bunsen burner disclosed in Japanese Patent Application Laid-Open No. 2001-112789. FIG. 7A is a side view of the Bunsen burner, and FIG. It is the principal part sectional drawing cut | disconnected.

Explanation of symbols

10 Bunsen burner 11 according to the first embodiment Bunsen burner 20 according to the second embodiment cylinder 21 outer tube 22 inner tube 23 inner air mixed gas flow passage 23a first inner air mixed gas flow passage 23b first 2 inner air mixed gas flow passage 23c third inner air mixed gas flow passage 24 outer air mixed gas flow passage 25 communication pipe 26 air intake adjusting ring 28 air intake hole 29 combustion gas ejection nozzle 30 base 31 combustion gas flow Path 32 Combustion gas on-off valve 33 Gas plug 34 Lever type gas plug 40 Piezoelectric igniter 42 Discharge rod 43 Push button 50 Bunsen burner grip body 60 Base plate 61 of the first embodiment Base plate 62 of the second embodiment Second Base plate 70 of another embodiment of the embodiment Portable gas cylinder

Claims (8)

A base plate base;
A cylindrical body with a bottom that is free to stand at a predetermined inclination on the base body;
An inner air mixed gas flow passage formed inside the cylindrical body;
An outer air mixed gas flow passage surrounding the inner air mixed gas flow passage formed in a double tube structure at a tip portion of the cylindrical body;
A communication hole communicating the inner air mixed gas flow passage and the outer air mixed gas flow passage formed in a base portion of the outer air mixed gas flow passage;
A combustion gas ejection nozzle and an air intake hole disposed at the bottom of the cylindrical body,
The combustion gas ejection nozzle communicated with a combustion gas flow passage formed in the substrate;
A combustion gas on-off valve interposed in an intermediate portion of the combustion gas flow passage,
The inner air mixed gas flow passage has a first inner air mixed gas flow passage, a second inner air mixed gas flow passage, and an inner diameter that gradually decreases from the bottom of the cylindrical body toward the tip of the cylindrical body. A Bunsen burner characterized in that a third inner air mixed gas flow passage is formed. The bunsen burner according to claim 1, wherein an ignition discharge rod is attached near the tip of the cylindrical body. An insertion hole disposed in the center of the base plate base,
A round bar-shaped gripping part that is removably inserted into the insertion hole, and
The bunsen burner according to claim 1 or 2, wherein the bunsen burner is removably inserted. The bunsen burner according to any one of claims 1 to 3, wherein the bunsen burner is pivotally supported by the grip portion. The bunsen burner according to claim 1, wherein the gas stopper for operating the gas on-off valve is a lever type. A seed-fire gas distribution pipe that is attached to the outside of the cylindrical body to form a seed-fire gas flow passage is provided,
Position the tip of the gas passage pipe for seed fire in the vicinity of the tip of the cylinder,
The bunsen burner according to any one of claims 1 to 5, further comprising a seeding mechanism connected to the combustion gas flow passage at a rear end of the seed gas flow passage. The bunsen burner according to any one of claims 1 to 6, wherein the other end of the combustion gas flow passage is connected to a portable gas cylinder. When using 13A city gas as combustion gas,
The nozzle diameter of the combustion gas ejection nozzle is approximately 0.3 mm to 0.5 mm, more preferably 0.3 mm to 0.4 mm,
The air intake hole having a diameter of about 6.0 mm to 11.0 mm, more preferably 6.0 mm to 8.0 mm is installed at one or two places, more preferably two places,
The first inner air mixed gas flow path diameter is approximately 9.0 mm, the second inner air mixed gas flow path diameter is approximately 5.0 mm, and the third inner air mixed gas flow path diameter is approximately 4. mm. 0 mm,
A flow passage width of the outer air mixed gas flow passage is approximately 1.0 mm to 2.0 mm;
The Bunsen burner according to any one of claims 1 to 7, wherein four communicating pipes having a diameter of approximately 1.0 mm to 1.7 mm are installed.

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