Combustor

Abstract

To provide a combustor in which once flowing into a rear nozzle mixing tube, liquid fuel is unlikely to flow out into a gap outside the rear nozzle mixing tube.SOLUTION: A combustion device 1 according to the present invention comprises a cylinder mounting tool 20 for mounting a cassette gas cylinder P storing gas G, and a plug body 18 for mounting the cylinder mounting tool 20. The plug body 18 has a passage 18F through which the gas G flows. Inside the plug body 18, a cylindrical rear nozzle mixing tube 14 is arranged through which the gas G flows. At a side surface part of the rear nozzle mixing tube 14, a single through hole is formed. The through hole is an inlet hole 14D through which the gas G that has flowed through the passage 18F flows into the interior of the rear nozzle mixing tube 14.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a combustion device to which a cassette gas cylinder can be detachably attached. [Background technology]

[0002] Conventionally, a combustion device capable of mounting a gas-filled cylinder is disclosed in Patent Document 1. In the gas local combustion device disclosed in Patent Document 1, when a cylinder (8) is inserted into a cylinder case (9) and a bottom cover (10) is screwed in, gas flows into a gas flow section (12). The gas then ejects from the nozzle hole of the nozzle (7) and mixes with outside air to become a mixed gas, which flows into the heater mantle 4. The mixed gas is then combusted in the heater mantle 4, and the heat from this combustion is reflected by a reflector (5).

[0003] The applicant of the present application manufactured and sold a combustion device 100 shown in Figs. 11 to 15 as a combustion device that detachably mounts a cassette gas cylinder and burns the fuel (liquid fuel and gas G, which is gas fuel) in the cassette gas cylinder. This combustion device 100 includes a cylinder attachment tool 120 for attaching a cassette gas cylinder P containing fuel, and a plug body 118 for attaching the cylinder attachment tool 120. The plug body 118 has a passage 118F through which the fuel flows, and a cylindrical rear nozzle mixing tube 114 through which the fuel flows is disposed inside the plug body 118. Two through holes are formed in the side portion of the rear nozzle mixing tube 114. One of the through holes is an inflow hole 114D through which the fuel that has flowed through the passage 118F flows into the inside of the rear nozzle mixing tube 114. The other through hole is a return hole 114E, which allows the fuel that does not flow into the inside of the rear nozzle mixing tube 114 from the inlet hole 114D but flows around the rear nozzle mixing tube 114 and into the gap S1 between the rear nozzle mixing tube 114 and the plug body 118 to flow into the inside of the rear nozzle mixing tube 114. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication No. 61-203202 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the combustion device 100 is in the operating position, the return hole 114E opens toward the lower side of the rear nozzle mixing tube 114, and therefore, of the fuel that flows into the rear nozzle mixing tube 114 from the inlet hole 114D, liquid fuel flows out of the rear nozzle mixing tube 114 from the return hole 114E and may accumulate in the gap S1. As a result, there is a problem that the combustion efficiency decreases.

[0006] The present invention is devised to solve the above-mentioned problems, and has an object to provide a combustion device in which liquid fuel that has once flowed into the rear nozzle mixing tube is less likely to flow out into the gaps outside the rear nozzle mixing tube. [Means for solving the problem]

[0007] The combustion device of the present invention comprises a container attachment part for attaching a fuel container containing fuel, and a plug body for attaching the container attachment part, wherein the plug body has a passage through which the fuel flows, a cylindrical flow path pipe through which the fuel flows is arranged inside the plug body, and one through hole is formed in a side portion of the flow path pipe, and the through hole is an inlet hole through which the fuel that has flowed through the passage flows into the inside of the flow path pipe. Effect of the Invention

[0008] According to the combustion device of the present invention, liquid fuel is less likely to remain in the gap outside the rear nozzle mixing tube, and combustion efficiency can be improved. [Brief description of the drawings]

[0009] [Figure 1] 1 is an external perspective view of a combustion device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an exploded view of the combustion device according to the embodiment. [Diagram 3] FIG. 2 is a vertical cross-sectional view of the combustion device according to the embodiment. [Figure 4] FIG. 2 is a side view of the front burner head of the embodiment. [Diagram 5] FIG. 2 is a side view of the rear burner head of the embodiment. [Figure 6] FIG. 2 is a side view of the inner burner head of the embodiment. [Figure 7] FIG. 2 is a perspective view of the burner mixing tube of the same embodiment. [Figure 8] FIG. 2 is a longitudinal sectional view of the burner mixing tube of the embodiment. [Figure 9] FIG. 4 is a vertical cross-sectional view of a pipe unit showing a gas flow in the embodiment. [Figure 10] FIG. 2 is a vertical cross-sectional view of the burner head showing the gas flow in the embodiment. [Figure 11] FIG. 1 is a perspective view of the appearance of a conventional combustion device. [Figure 12] FIG. 1 is a vertical cross-sectional view of a conventional burner head. [Figure 13] FIG. 1 is a perspective view of a conventional burner mixing tube. [Figure 14] FIG. 1 is a longitudinal sectional view of a conventional burner mixing tube. [Figure 15] FIG. 11 is a vertical cross-sectional view of a conventional pipe unit showing a gas flow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Note that not all of the configurations described below are essential requirements for the present invention.

[0011] 1 to 3, a combustion device 1 according to one embodiment of the present invention includes a guard 2, a burner head 3, a reflector 4, a support unit 5, and a tube unit 6 to which a cassette gas cylinder P (CB can) is detachably attached. The cassette gas cylinder P, which is a fuel container, is filled with liquid fuel and gas G, which is a gas fuel formed by vaporizing the liquid fuel.

[0012] The guard 2 is formed by bending a long, thin rod-shaped member, and has locking portions 2A and 2B formed on the left and right sides. The guard 2 can be attached to the reflector 4 by locking the locking portions 2A and 2B to the reflector 4.

[0013] The burner head 3 as a combustion section has a front burner head 7, a rear burner head 8, and an inner burner head 9. The front burner head 7 and the rear burner head 8 form an outer shell of the burner head 3.

[0014] As shown in Fig. 4, the front burner head 7 as the front combustion section is formed of a mesh member, and the center part of the front part 7A has a shape that bulges forward. The side part 7B of the front burner head 7 has a cylindrical shape, and a flange part 7C that bulges outward is formed at the rear end part of the side part 7B. A plurality of intake holes 7D are formed in the side part 7B, so that the surrounding air can be taken into the front burner head 7.

[0015] As shown in Fig. 5, the rear burner head 8 as the rear combustion section is formed of a mesh member, and the rear surface portion 8A has a shape that bulges backward. The side surface portion 8B of the rear burner head 8 has a cylindrical shape, and a flange portion 8C that protrudes outward is formed at the front end portion of the side surface portion 8B. A cylindrical holding portion 8D that stands upright at the front is formed at the outer periphery of this flange portion 8C. A plurality of intake holes 8E are formed in the side surface portion 8B, so that surrounding air can be taken into the rear burner head 8.

[0016] As shown in Fig. 6, the inner burner head 9 as an internal body is formed of a mesh material, and has a body portion 9A that bulges forward, and a flange portion 9B that bulges outward is formed at the rear end portion of the body portion 9A. The center portion of the body portion 9A has a shape that is slightly recessed backward.

[0017] The flange portion 9B of the inner burner head 9 is brought into contact with the flange portion 8C of the rear burner head 8, and the flange portion 7C of the front burner head 7 is brought into contact with the flange portion 9B of the inner burner head 9. In this state, the holding portion 8D of the rear burner head 8 is bent inward, and the flange portion 7C of the front burner head 7 and the flange portion 9B of the inner burner head 9 are sandwiched and fixed by the flange portion 8C and holding portion 8D of the rear burner head 8, thereby forming the burner head 3. The inner burner head 9, which is disposed inside the front burner head 7 and the rear burner head 8, has the flange portion 9B in contact with the front burner head 7 and the rear burner head 8, but the main body portion 9A does not contact the front burner head 7 and the rear burner head 8.

[0018] The burner head 3 is formed hollow by the front burner head 7 and the rear burner head 8, which are outer shells, and its internal space is divided by the inner burner head 9. The rear space M2 formed by the rear burner head 8 and the inner burner head 9 is larger than the front space M1 formed by the front burner head 7 and the inner burner head 9.

[0019] 2, the reflector 4 is formed in a round plate shape with locking holes 4A, 4B formed on the left and right sides. The guard 2 is attached to the reflector 4 by inserting the locking parts 2A, 2B of the guard 2 into the locking holes 4A, 4B from the front side and locking them to the reflector 4. Also, an insertion hole 4C is formed in the center of the reflector 4.

[0020] As shown in Figs. 1 to 3, the support unit 5 has a stand plate 10 formed by bending a plate-like member, and a stand wire 11 formed by bending a rod-like member. An insertion hole 10B is formed in a vertically long rectangular main body 10A of the stand plate 10. Mounting holes 10E and 10F are formed in left and right side plate portions 10C and 10D of the stand plate 10, and the left and right ends 11A and 11B of the stand wire 11 are inserted into the mounting holes 10E and 10F, so that the stand wire 11 can be rotatably attached to the stand plate 10. A heat transfer portion 10G inclined toward the rear is formed in the upper end portion of the main body 10A. The heat transfer portion 10G is adapted to come into contact with a cylinder mounting fixture 20, which will be described later. The stand wire 11 is rotatable about the ends 11A and 11B as axes, and can be opened to move the lower end 10H of the stand plate 10 and the lower end 11C of the stand wire 11 away from each other, or closed to move the lower end 10H and the lower end 11C closer to each other. By opening the stand wire 11, the combustion device 1 can be set upright in a usable state, as shown in Figs. 1 and 3.

[0021] With the main body 10A of the stand plate 10 in contact with the rear surface 4D of the reflector 4, the male screw portion 13A of the front nozzle mixing tube 13 described later is inserted into the insertion holes 4C and 10B from the rear side, and is screwed into the female screw portion 12D of the burner mixing tube 12 described later on the front surface 4E side of the reflector 4, so that the reflector 4 and the stand plate 10 are fixed in a state where they are sandwiched between the burner mixing tube 12 and the front nozzle mixing tube 13. In this way, the reflector 4 and the stand plate 10 are held in contact with each other, so that the heat of the reflector 4 is transferred to the stand plate 10.

[0022] As shown in Figures 1 to 3, the tube unit 6 has a burner mixing tube 12, a front nozzle mixing tube 13, a rear nozzle mixing tube 14, a tip 15, a pin 16, a pin holder 17, a plug body 18, a knob 19, and a cylinder mounting fixture 20.

[0023] The burner mixing tube 12 has a generally cylindrical shape, and gas G discharged from the cassette gas cylinder P and air mixed with gas G flow inside. A plurality of intake holes 12B are formed in the side portion 12A of the burner mixing tube 12, so that surrounding air can be taken into the burner mixing tube 12. A burner base 21 is fixed to the front end portion 12C of the burner mixing tube 12 by crimping, and the burner head 3 (rear burner head 8) is attached to this burner base 21 by welding. A female screw portion 12D is formed in the rear inner surface portion of the burner mixing tube 12.

[0024] The opening 12E, which supplies gas G from the burner mixing tube 12 to the burner head 3, faces the rear portion 8A of the rear burner head 8, the main body portion 9A of the inner burner head 9 arranged in front of the rear portion 8A, and the front portion 7A of the front burner head 7 arranged in front of the main body portion 9A.

[0025] The front nozzle mixing tube 13 has a substantially cylindrical shape, and gas G discharged from the cassette gas cylinder P and air mixed with gas G flow inside. A male screw portion 13A is formed in the front part of the front nozzle mixing tube 13, and is screwed into the female screw portion 12D of the burner mixing tube 12. A plurality of intake holes 13C are formed in the side portion 13B of the front nozzle mixing tube 13, so that the surrounding air can be taken into the front nozzle mixing tube 13. A female screw portion 13D is formed in the rear inner surface portion of the front nozzle mixing tube 13. In addition, an opening and closing portion 13E with a reduced inner diameter is formed in the inner portion of the front nozzle mixing tube 13.

[0026] As shown in Figs. 7 and 8, the rear nozzle mixing tube 14 as a flow passage tube has a substantially cylindrical shape, and gas G discharged from the cassette gas cylinder P and air mixed with the gas G flow inside. A male screw portion 14A is formed at the front end portion of the rear nozzle mixing tube 14, and the male screw portion 14A is screwed into the female screw portion 13D of the front nozzle mixing tube 13. An O-ring 22 is sandwiched between the front nozzle mixing tube 13 and the rear nozzle mixing tube 14 (see Figs. 2 and 3). In addition, the side portion of the rear nozzle mixing tube 14 has a small diameter side portion 14B formed with a slightly smaller outer diameter and a large diameter side portion 14C which is the portion other than the small diameter side portion 14B, and one inflow hole 14D which is a through hole is formed in the small diameter side portion 14B. The liquid fuel and gas G discharged from the cassette gas cylinder P flow into the rear nozzle mixing tube 14 from the inflow hole 14D.

[0027] 2 and 3, the pin 16 is crimped and fixed to the pin holder 17 by the tip 15. The pin tip 16A of the pin 16 protrudes forward from the tip 15. Therefore, the part of the pin 16 other than the pin tip 16A is disposed inside the pin holder 17.

[0028] The pin holder 17 has a front cylindrical portion 17A on the front side, a rear cylindrical portion 17B on the rear side, and a male screw portion 17C located between the front cylindrical portion 17A and the rear cylindrical portion 17B. The tip 15, the pin 16, and the front cylindrical portion 17A are inserted into the rear nozzle mixing tube 14, and the pin tip 16A is inserted into the front nozzle mixing tube 13.

[0029] As shown in Figures 2 and 3, the plug body 18 has a horizontal cylinder section 18A having a substantially cylindrical shape, a vertical cylinder section 18B having a substantially cylindrical shape, and a base section 18C that engages with a substantially disk-shaped cylinder attachment 20. An intake hole 18D that takes in air from the outside is formed in the horizontal cylinder section 18A. Inside the horizontal cylinder section 18A, the front nozzle mixing tube 13 except for the male thread section 13A, the rear nozzle mixing tube 14, the tip 15, the pin 16, the pin holder 17, and O-rings 22 and 23 are arranged. A part of the rear cylinder section 17B of the pin holder 17 protrudes rearward from the horizontal cylinder section 18A.

[0030] A female screw portion 18E is formed on the inner surface of the horizontal cylinder portion 18A. A male screw portion 17C of the pin holder 17 is screwed into the female screw portion 18E, and by rotating the pin holder 17, the pin holder 17 moves in the front-rear direction along the female screw portion 18E.

[0031] A long and narrow passage 18F is formed inside the vertical cylinder portion 18B. The liquid fuel and gas G discharged from the cassette gas cylinder P flow inside the passage 18F and reach the inlet hole 14D of the rear nozzle mixing tube 14. Some of the liquid fuel and gas G that flow inside the passage 18F flows to the outside of the rear nozzle mixing tube 14, but the O-ring 22 maintains the airtightness between the rear nozzle mixing tube 14 and the vertical cylinder portion 18B, and the O-ring 23 maintains the airtightness between the pin holder 17 and the vertical cylinder portion 18B, so that the liquid fuel and gas G do not leak out to the outside.

[0032] A cylinder attachment tool 20 is attached to the base 18C as a container attachment part. When a cassette gas cylinder P is attached to the cylinder attachment tool 20, the outlet P1 of the cassette gas cylinder P communicates with the passage 18F (see FIG. 9). The heat transfer part 10G of the stand plate 10 abuts against the cylinder attachment tool 20. Therefore, heat transferred from the reflector 4 to the main body 10 is transferred from the heat transfer part 10G to the cylinder attachment tool 20. In addition, the heat transferred to the cylinder attachment tool 20 warms the cassette gas cylinder P attached to the cylinder attachment tool 20. This promotes the vaporization of the liquid fuel in the cassette gas cylinder P, and allows it to be released from the cassette gas cylinder P as gas G.

[0033] The knob 19 is attached to the rear cylinder portion 17B of the pin holder 17. By rotating the knob 19, the pin holder 17 rotates integrally with the knob 19, so that the pin holder 17 can be moved back and forth by rotating the knob 19.

[0034] Here, the method of using the combustion device 1 will be described. First, the cassette gas cylinder P is attached to the cylinder attachment 20. Next, the knob 19 is turned left to move the pin holder 17 backward. When the pin holder 17 is moved backward, the pin tip 16A that had been blocking the opening and closing part 13E of the front nozzle mixing tube 13 is separated from the opening and closing part 13E, and the opening and closing part 13E opens. Then, the gas G in the cassette gas cylinder P is discharged from the discharge port P1, and the gas G flows in the order of the passage 18F, the rear nozzle mixing tube 14, the front nozzle mixing tube 13, and the burner mixing tube 12, and is discharged from the opening 12E of the burner mixing tube 12 and reaches the inside of the burner head 3 (see FIG. 9). At this time, air is taken in from the intake holes 12B, 13C, and 18D and mixed with the gas G.

[0035] A flame such as a match or a lighter is brought close to the burner head 3 to ignite the gas G in the burner head 3. Air is also taken in through the intake holes 7D and 8E, and the gas G burns. As shown in FIG. 10, most of the gas G discharged from the opening 12E of the burner mixing tube 12 hits the main body 9A of the inner burner head 9, flows backward along the main body 9A, and burns inside the rear space M2. Since the center part of the main body 9A has a shape that is slightly concave backward, the gas G easily flows backward along the main body 9A. In addition, the gas G that passes through the main body 9A hits the front part 7A of the front burner head 7, flows backward along the front part 7A and the side part 7B, and burns inside the front space M1. Since most of the gas G burns inside the rear space M2, the rear space M2 is formed wider (larger) than the front space M1. In this way, because the inside of the burner head 3 has a two-chamber structure, very little gas G or flame leaks out from the front burner head 7, and most of the gas G burns inside the burner head 3, and most of the radiant heat H emitted by this combustion heads toward the reflector 4. The radiant heat H reflected by the reflector 4 is then transmitted far and wide in the front. Also, the rear space M2 is less susceptible to the effects of wind than the front space M1 near the tip of the burner head 3, and the combustion of the gas G is less likely to become unstable.

[0036] Next, a conventional combustion device 100 will be described with reference to Figures 11 to 14, focusing on the differences from the combustion device 1 of this embodiment. As shown in Figures 11 and 12, the burner head 103 of the combustion device 100 is formed of a mesh member and is composed of two parts, a front burner head 107 and a rear burner head 108. In the burner head 103, like the burner head 3 described above, a burner base 121 is attached by welding, and a burner mixing tube 112 is fixed to the burner base 121 by crimping.

[0037] The burner head 103 does not have a structure corresponding to the inner burner head 9 of the combustion device 1, and has a single-chamber structure. In addition, since the curvature of the front part 107A of the front burner head 107 is extremely small, the gas G discharged from the opening 112E of the burner mixing tube 112 flows forward in a straight line, and a large amount of the gas G goes out of the burner head 103 from the front part 107A. Therefore, the flame of the gas G during combustion goes out of the burner head 103. In addition, when the burner head 103 is exposed to wind, the wind enters the inside of the burner head 103, and the gas G in the burner head 103 is affected by the wind, which can cause the combustion of the gas G to become unstable.

[0038] As shown in Figures 13 and 14, the rear nozzle mixing tube 114 of the combustion device 100 has an inlet hole 114D and a return hole 114E, which is a through hole, formed in the small diameter side surface portion 114B. The inlet hole 114D and the return hole 114E are formed at opposing positions. The liquid fuel and gas G discharged from the cassette gas cylinder P flow into the rear nozzle mixing tube 114 from the inlet hole 114D.

[0039] 15, since the inflow hole 114D is formed in the small diameter side surface portion 114B, an annular gap S is formed between the horizontal tube portion 118A of the plug body 118 and the small diameter side surface portion 114B. Therefore, the liquid fuel and gas G that have flowed through the passage 118F of the plug body 118 flow into the gap S, although only in small amounts. In the conventional combustion device 100, a return hole 114E is formed to allow the liquid fuel and gas G that have flowed into the gap S to flow into the interior of the rear nozzle mixing tube 114.

[0040] Most of the liquid fuel and gas G that flowed into rear nozzle mixing tube 114 from inlet hole 114D passes through opening / closing section 113E, flows through burner mixing tube 112, and reaches burner head 103, but some of the liquid fuel and gas G flows out of rear nozzle mixing tube 114 from return hole 114E and accumulates in gap S between rear nozzle mixing tube 114 and horizontal cylinder section 118A of plug body 118. In particular, liquid fuel, which has a larger mass than gas G, tends to accumulate in gap S.

[0041] As described above, the combustion device 1 of this embodiment includes the cylinder attachment 20 for attaching the cassette gas cylinder P containing the gas G, and the plug body 18 for attaching the cylinder attachment 20. The plug body 18 has a passage 18F through which the gas G flows, and the cylindrical rear nozzle mixing tube 14 through which the gas G flows is disposed inside the plug body 18. One through hole is formed in the side of the rear nozzle mixing tube 14, and the through hole is an inflow hole 14D through which the gas G that has flowed through the passage 18F flows into the inside of the rear nozzle mixing tube 14. Since the combustion device 1 does not have the return hole 114E of the conventional combustion device 100, the liquid fuel and gas G do not flow into the gap S from the return hole 114E, and the liquid fuel and gas G are less likely to remain in the gap S. As a result, the combustion efficiency is improved.

[0042] Moreover, in the combustion device 1 of the present embodiment, the inflow hole 14D opens opposite the passage 18F, so that the fuel that has flowed through the passage 18F can be efficiently caused to flow into the inflow hole 14D.

[0043] In addition, in the combustion device 1 of this embodiment, when the cassette gas cylinder P is attached to the upper side of the cylinder mounting fixture 20, the inflow hole 14D opens facing upward. Therefore, the liquid fuel flowing through the passage 18F flows from the upper side to the lower side, and therefore, the liquid fuel flows easily into the inflow hole 14D due to gravity.

[0044] The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention. For example, the guard 2, the reflector 4, the support unit 5, etc. may have other shapes in consideration of the overall design of the combustion device 1. [Explanation of symbols]

[0045] 1 Combustion equipment 14 Rear nozzle mixing tube (flow path tube) 14D Inflow hole (through hole) 18 Stopper body 18F aisle 20 Cylinder mounting fixture (container mounting part) G Gas (fuel) P Cassette gas cylinder (fuel container)

Claims

1. a container mounting portion for mounting a fuel container containing fuel; a plug body for attaching the container attachment portion; The plug body has a passage through which the fuel flows, a cylindrical flow passage pipe through which the fuel flows is disposed inside the plug body, A through hole is formed in a side surface of the flow passage pipe, A combustion device characterized in that the through hole is an inlet hole through which the fuel that has flowed through the passage flows into the inside of the flow passage pipe.

2. 2. The combustion apparatus according to claim 1, wherein the inlet hole opens opposite to the passage.

3. 2. The combustion apparatus according to claim 1, wherein the inlet hole opens upward when the fuel container is attached to the upper side of the container attachment part.

Images