Burner

Abstract

To provide a burner capable of securing airtightness of a gas chamber into which gas supplied from a gas cylinder is introduced with a simple structure.SOLUTION: The burner 1 for feeding gas supplied from a gas cylinder 2 to a burner head 3 to burn the gas has a housing 4 having a gas chamber 25 formed therein through a stem 14 provided in the gas cylinder 2, a cylinder holder 10 for holding the gas cylinder 2, and a holder cap 11 provided outside a gas flow path for attaching the cylinder holder 10 to the housing 4 rotatably at a predetermined angle, wherein the gas chamber 25 is surrounded by a seamless inner wall.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a burner for use indoors, outdoors, etc. [Background technology]

[0002] When boiling water or cooking outdoors, such as camping, a burner such as that shown in Patent Document 1 is used. This burner sends gas supplied from a cassette-type gas cylinder (hereinafter abbreviated as gas cylinder) to a burner head for combustion. This gas cylinder is held by a cylinder holder provided in the housing.

[0003] The cylinder holder is attached to the housing by being sandwiched between the main housing side and the divided side, with the housing being divided near the gas inlet of the housing. A primary gas chamber surrounded by the main housing side and the divided side is formed at the tip side of the stem of the gas cylinder (see Figure 1 of Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-229033 Summary of the Invention [Problem to be solved by the invention]

[0005] In the burner shown in Patent Document 1, there is a connection between the housing main body side and the divided side inside the primary gas chamber. Because the internal pressure of the gas cylinder acts directly on this connection, it is necessary to provide a sealing member such as an O-ring to ensure airtightness at this connection, and high component precision and assembly precision are required for the housing main body side and the divided side, which can lead to high costs.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a burner that can ensure, with a simple structure, airtightness of a gas chamber into which gas supplied from a gas cylinder is introduced. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: In a burner in which gas supplied from a gas cylinder is sent to the burner head and burned, a housing having a gas chamber formed therein into which gas is delivered through a stem provided in the gas cylinder; a cylinder holder for holding the gas cylinder; a holder cap provided outside the gas flow path, which mounts the cylinder holder on the housing so as to be rotatable by a predetermined angle; The burner is configured (first configuration), characterized in that the gas chamber is surrounded by a seamless inner wall.

[0008] In this way, the airtightness of the gas chamber into which the gas supplied from the gas cylinder is introduced can be ensured with a simple structure.

[0009] In the first configuration, the holder cap can be made of resin (second configuration). By making the holder cap, which is located outside the gas flow path and does not require heat resistance, from resin, it is possible to reduce the weight, thereby improving convenience when used outdoors, etc.

[0010] In the first and second configurations, a configuration (third configuration) can be adopted in which the cylinder holder has a notch fitting portion that fits into a notch formed in the flange of the gas cylinder, and the cylinder holder and the gas cylinder are positioned by rotating the cylinder holder with the notch fitted into the notch fitting portion. In this way, vaporized gas can be stably supplied from the gas cylinder to the burner.

[0011] In a third configuration, the cylinder holder is formed with claws that are inserted into the inside of the flange, and the holder cap is formed with an expanded diameter portion, so that when the cylinder holder is rotated around its axis relative to the housing, the expanded diameter portion enters the inner diameter side of the claws to expand the diameter of the claws or prevents the claws from bending toward the inner diameter side (fourth configuration). In this way, the expanded diameter claws fit inside the flange, and the gas cylinder can be firmly held by the cylinder holder. [Effects of the Invention]

[0012] The burner according to the present invention has a gas chamber surrounded by a seamless inner wall, so that the gas chamber into which gas supplied from the gas cylinder is introduced can be kept airtight with a simple structure. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing an embodiment of a burner according to the present invention; [Figure 2] Enlarged cross-sectional view of the main part of the burner shown in Figure 1 [Figure 3] FIG. 2 is an exploded perspective view of the main part of the burner shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of a burner 1 according to the present invention will be described with reference to the drawings. Burner 1 is a device that sends gas supplied from a gas cylinder 2 (a cassette-type gas cylinder) to a burner head 3 and burns the gas. A cross-sectional view of one embodiment of this burner 1 is shown in Fig. 1, an enlarged cross-sectional view of the main parts is shown in Fig. 2, and an exploded perspective view of the main parts is shown in Fig. 3.

[0015] The burner 1 has a housing 4, and a burner head 3 is attached to the housing 4 via an intake pipe 5. The housing 4 is provided with a plurality of legs 6 that also serve as a trivet, and a piezoelectric element 8 for generating a discharge from a core wire 7 attached to the burner head 3.

[0016] As shown in FIG. 3, a cylindrical portion 9 that opens toward the outside is formed at the portion of the housing 4 where the gas cylinder 2 is attached. A cylinder holder 10 with a through hole formed in its center is attached to this cylindrical portion 9, and the cylinder holder 10 is rotatably attached to the housing 4 by a substantially cylindrical holder cap 11 that also has a through hole formed in its center. This holder cap 11 is a separate member from the housing 4 through which gas flows, and is located outside the range of the gas flow path, so its material does not require heat resistance. For this reason, in this embodiment, a lightweight resin material is used. The material of the holder cap 11 is not limited to resin, and it could also be made of sheet metal, for example.

[0017] A T-shaped protrusion 12 is formed on the outer peripheral surface of the cylindrical portion 9. Meanwhile, a T-shaped recess 13 is formed in the holder cap 11, into which the protrusion 12 formed on the cylindrical portion 9 fits. By fitting the protrusion 12 into this recess 13, the holder cap 11 is fixed to the cylindrical portion 9 so as not to be able to rotate relative to it.

[0018] Inside the opening of the cylindrical portion 9, there is provided an O-ring 15 that is interposed between the stem 14 of the gas cylinder 2 and the housing 4 when the gas cylinder 2 is attached, and a retaining member 16 that prevents the O-ring 15 from coming off. In addition, at the open end of the cylindrical portion 9, there is provided an O-ring 17 that is interposed between the open end and the holder cap 11.

[0019] The cylinder holder 10 is formed with three claws 19 that are inserted into recesses on the inside of the flange 18 of the gas cylinder 2, and notch fitting portions 20 that fit into notches (not shown) formed in the flange 18. Meanwhile, the cylindrical surface of the holder cap 11 is formed with three enlarged diameter portions 21 that correspond to the circumferential positions of the three claws 19 formed on the cylinder holder 10. The claws 19 are formed with inclined surfaces 22 at their circumferential ends, and the enlarged diameter portions 21 are formed with wall portions 23 that protrude radially outward beyond the enlarged diameter portions 21.

[0020] The gas cylinder 2 is attached to the cylinder holder 10 in a state where the enlarged diameter portion 21 formed on the holder cap 11 is positioned between circumferentially adjacent claw portions 19 formed on the cylinder holder 10 (gas cylinder removable state), and the notch formed on the flange 18 fits into the notch fitting portion 20 formed on the cylinder holder 10.

[0021] When the cylinder holder 10 together with the gas cylinder 2 is rotated around the axis relative to the housing 4, the claws 19 formed on the cylinder holder 10 gradually expand in diameter as the inclined surfaces 22 formed on the circumferential ends of the claws 19 abut against the circumferential ends of the enlarged-diameter portions 21 formed on the holder cap 11. The enlarged-diameter portions 21 then enter the inner diameter side of the claws 19 while preventing the claws 19 from bending toward the inner diameter side. When the gas cylinder 2 is further rotated until the claws 19 abut against the wall portions 23 of the enlarged-diameter portions 21, the claws 19, which overlap radially with the enlarged-diameter portions 21, enter a slightly enlarged diameter state (gas cylinder holding state) due to the action of the enlarged-diameter portions 21 entering the inner diameter side. The enlarged claws 19 fit into the recesses on the inner side of the flange 18 of the gas cylinder 2, and the gas cylinder 2 is firmly held by the cylinder holder 10 (a state in which the gas cylinder 2 is prevented from slipping out). The housing 4 and the cylinder holder 10 are capable of relative rotation around an axis between a gas cylinder detachable state and a gas cylinder holding state.

[0022] 2, a regulator 24 for adjusting the flow rate of gas is provided inside the housing 4. Regulator 24 has as its main components a gas chamber 25, a valve body 26, a valve seat 27, a diaphragm 28, a counter spring 29, an adjustment spring 30, and a spindle 31.

[0023] The gas chamber 25 is a space into which gas is introduced from the gas cylinder 2, and the stem 14 of the gas cylinder 2 is abutted against one end of the gas chamber 25. The gas pressure within the gas chamber 25 is the same as the internal pressure of the gas cylinder 2. Because the gas chamber 25 is surrounded by a seamless inner wall, there is no risk of gas leaking from the gas chamber 25 even if the internal pressure of the gas cylinder 2 acts.

[0024] The valve element 26 is a rod-shaped member that is provided so as to be movable in its axial direction within the gas chamber 25. An O-ring 32 is provided on one end of the valve element 26. The valve seat 27 is a substantially cylindrical member that is made of a separate member from the housing 4 and is fixed within the gas chamber 25 coaxially with the valve element 26, with the valve element 26 inserted into the valve seat 27. The valve element 26 and the valve seat 27 are pre-assembled and fixed within the gas chamber 25 from the side opposite the side where the gas cylinder 2 is attached (the left side in FIG. 2).

[0025] 2 is a closed valve state in which a tapered surface 33 formed on one end of the valve seat 27 abuts against an O-ring 32 provided on the valve element 26, and the valve is opened when the valve element 26 is further protruded from the end of the valve seat 27 to separate the tapered surface 33 from the O-ring 32. A minute flow path 34 consisting of a minute gap is formed between the outer peripheral surface of the valve element 26 and the inner peripheral surface of the valve seat 27 at both axial ends of the valve seat 27, and gas flows through this minute flow path 34 when the valve element 26 is in the open valve state.

[0026] The diaphragm 28 is a disk-shaped member with a through hole formed in the center, which biases the valve element 26 in the valve closing direction while preventing gas leakage from the housing 4 to the outside. The outer peripheral edge of the diaphragm 28 is fixed to the housing 4 by being sandwiched between a step formed inside the housing 4 and a housing cap 35 that is screwed onto this step. The inner peripheral edge of the diaphragm 28 facing the through hole is fixed to the connecting member 36 by being sandwiched between a flange formed on the connecting member 36 that is arranged so as to abut coaxially against the valve element 26, and a flange formed on a fixing member 37 that is inserted coaxially into the connecting member 36.

[0027] The counter spring 29 is provided in the space formed between the outer peripheral surface of the valve element 26 and the inner peripheral surface of the valve seat 27 so as to be interposed between the valve element 26 and the valve seat 27. The counter spring 29 assists the biasing force applied from the diaphragm 28 to the valve element 26 in the valve closing direction.

[0028] The adjusting spring 30 is a member that biases the valve element 26 in the valve opening direction via a fixed member 37 and a connecting member 36. The adjusting spring 30 is disposed inside a cylindrical spindle 31 with a bottom via a sphere 38, and its end abuts against the flange surface of a flange formed on the fixed member 37. The sphere 38 has a diameter larger than the winding diameter of the adjusting spring 30.

[0029] The spindle 31 can be screwed into the housing cap 35. By operating a handle 39 attached to the spindle 31 to change the amount of screwing of the spindle 31, it is possible to adjust the biasing force of the adjustment spring 30 in the valve opening direction of the valve element 26, i.e., the degree to which the valve element 26 is open. A lock nut 40 prevents the spindle 31 from falling out of the housing cap 35.

[0030] When the valve element 26 is in an open state, the gas that flows through the minute flow passage 34 passes through a flow passage 41 formed along the surface of the diaphragm 28 on the valve element 26 side and reaches the nozzle 42. The gas pressure of the gas passing through this flow passage 41 is lower than the gas pressure in the gas chamber 25. When the gas is injected from the nozzle 42 into the intake pipe 5, air is sucked in through an intake hole 43 formed in the intake pipe 5 as the gas is injected, and a mixed gas of the gas and air is generated. This mixed gas is released from a nozzle formed in the burner head 3 and is ignited and burned by electric discharge from a core wire 7 provided in the burner head 3.

[0031] In the burner 1 described above, the gas chamber 25 formed inside the housing 4 is surrounded by a seamless inner wall, so there is no need to provide a separate component such as an O-ring inside the gas chamber 25 to ensure airtightness, and the airtightness of the gas chamber 25 into which the gas supplied from the gas cylinder 2 is introduced can be ensured with a simple configuration.

[0032] Furthermore, the burner 1 can be made lighter by using resin for the holder cap 11, which is located outside the gas flow path and does not require heat resistance, thereby improving convenience when used outdoors, etc.

[0033] Furthermore, the burner 1 described above has a notch fitting portion 20 formed in the cylinder holder 10 that fits into a notch formed in the flange 18 of the gas cylinder 2, and the cylinder holder 10 (gas cylinder 2) can be positioned by rotating the cylinder holder 10 with the notch fitted into the notch fitting portion 20, so that vaporized gas can be stably supplied from the gas cylinder 2 to the burner 1.

[0034] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. The above configuration can be applied to various gas appliances, such as a gas torch that does not have a regulator 24. [Explanation of symbols]

[0035] 1 Burner 2 gas cylinders 3 Burner Head 4. Housing 5 Intake pipe 6 legs 7 core wire 8 Piezoelectric element 9 Cylindrical part 10 Cylinder holder 11 Holder cap 12 Protrusion 13 Recess 14 Stem 15, 17, 32 O-rings 16. Anti-slip member 18 flange 19 Claw 20 Notched fitting part 21 Expanded diameter part 22 Slope 23 Wall 24 Regulator 25 Gas Chamber 26 Valve body 27 Valve seat 28 Diaphragm 29 Counter spring 30 Adjustment spring 31 Spindle 33 Tapered surface 34 Microchannel 35 Housing cap 36 Connecting member 37 Fixing member 38 sphere 39 Handle 40 Locking nut 41 Flow path 42 nozzles 43 Air intake

Claims

1. A burner in which gas supplied from a gas cylinder (2) is sent to a burner head (3) and burned, a housing (4) having a gas chamber (25) formed therein into which gas is delivered through a stem (14) provided on the gas cylinder (2); a cylinder holder (10) for holding the gas cylinder (2); a holder cap (11) provided outside the gas flow path for attaching the cylinder holder (10) to the housing (4) so ​​as to be rotatable by a predetermined angle; and wherein the gas chamber (25) is surrounded by a seamless inner wall that is in communication with the atmosphere outside the housing (4).

2. 2. A burner according to claim 1, wherein the holder cap (11) is made of resin.

3. 3. A burner as claimed in claim 1 or 2, wherein the cylinder holder (10) is formed with a notch fitting portion (20) that fits into a notch formed in a flange (18) of the gas cylinder (2), and the cylinder holder (10) and the gas cylinder (2) are positioned by rotating the cylinder holder (10) with the notch fitted into the notch fitting portion (20).

4. A burner as described in claim 3, wherein the cylinder holder (10) is formed with a claw portion (19) that is inserted inside the flange (18), and the holder cap (11) is formed with an enlarged diameter portion (21), and when the cylinder holder (10) is rotated around its axis relative to the housing (4), the enlarged diameter portion (21) enters the inner diameter side of the claw portion (19) to enlarge the diameter of the claw portion (19) or prevents the claw portion (19) from bending toward the inner diameter side.

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