Cassette stove and fuel container

Abstract

The present invention provides a portable gas stove that uses hydrogen gas as fuel while suppressing the occurrence of flashback, and a fuel container that supplies hydrogen gas to the portable gas stove. [Solution] The cassette stove 10 is a cassette stove that uses hydrogen gas as fuel, and supplies hydrogen gas to the burner section 20 while keeping it isolated from the air, and mixes the hydrogen gas supplied to the burner section 20 with the air surrounding the burner section 20 for combustion.

Description

Technical Field

[0001] The present invention relates to a cassette stove and a fuel container, and particularly to a cassette stove using hydrogen gas as fuel and a fuel container for supplying hydrogen gas to the cassette stove.

Background Art

[0002] Conventionally, cassette stoves that can be used indoors and outdoors have been used for cooking and the like (see, for example, Patent Document 1). In the technology described in Patent Document 1, air is mixed with fuel such as butane (C4H 10 ) gas injected from a gas cylinder in a mixing pipe, and the mixed gas is supplied to a burner, whereby the mixed gas is burned at the burner. Such a combustion method of a cassette stove is generally called a "premixed combustion method". Cassette stoves using a premixed combustion method with butane gas or the like as fuel are widely used not only in disasters but also in daily life.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, from the perspective of carbon neutral policies aiming at global environmental conservation, not only large-scale devices such as industrial furnaces but also cassette stoves as small combustion appliances used in daily life are desired to switch fuels such as butane gas that emit CO2 gas to other fuels. Regarding this, it is conceivable to use hydrogen gas that does not emit CO2 gas as fuel. Hydrogen gas is non-toxic, has a low specific gravity, and has a wide combustion range, so it is superior as fuel compared to conventional fuel gases such as butane gas. On the other hand, hydrogen gas burns faster than conventional fuel gases. Therefore, when using hydrogen gas as fuel in the portable gas stove described in Patent Document 1, there is a risk of flashback. In order to use a portable gas stove that uses hydrogen gas as fuel safely and stably, it is necessary to suppress the occurrence of such flashback.

[0005] Therefore, the present invention has been made in view of the above problems, and its objective is to provide a portable gas stove that uses hydrogen gas as fuel while suppressing the occurrence of flashback, and a fuel container that supplies hydrogen gas to the portable gas stove. [Means for solving the problem]

[0006] The above objective is achieved by the present invention, which is a portable gas stove that uses hydrogen gas as fuel, supplying hydrogen gas to the burner while keeping it isolated from the air, and then mixing the hydrogen gas supplied to the burner with the air surrounding the burner for combustion.

[0007] Furthermore, the cassette stove of the present invention comprises a mounting section to which a fuel container filled with hydrogen gas is attached, and a supply section that supplies the hydrogen gas in the fuel container attached to the mounting section to the burner section while keeping it isolated from the air. The burner section may burn the hydrogen gas supplied from the supply section by mixing it with the air surrounding the burner section. Furthermore, the cassette stove of the present invention may further include a pressure adjustment unit that adjusts the pressure of hydrogen gas supplied from a fuel container attached to the mounting unit, and the burner unit may be supplied with hydrogen gas whose pressure has been adjusted by the pressure adjustment unit. The burner section may also include an annular pipe to which hydrogen gas is supplied, and a nozzle section provided in the pipe for releasing the hydrogen gas inside the pipe to the outside. Furthermore, the nozzle section may have a plurality of first openings formed in the pipe, a box-shaped body that surrounds the plurality of first openings from the outside of the pipe, thereby isolating the plurality of first openings from the outside, and one or more second openings formed in the box-shaped body, which are fewer in number than the plurality of first openings, and hydrogen gas that flows from the pipe into the box-shaped body through the plurality of first openings may be released to the outside through one or more second openings. Furthermore, the nozzle section may further include a mesh member placed inside the box, and hydrogen gas that flows into the box from the pipe through a plurality of first openings may be discharged to the outside through a second opening after passing through the mesh member. Furthermore, the fuel container of the present invention is a fuel container for supplying hydrogen gas to the cassette stove described above, and comprises a container body and a powder contained within the container body for storing and releasing hydrogen gas. Furthermore, the fuel container of the present invention may further include a nozzle for ejecting hydrogen gas from the container body to the outside, and a filter located upstream of the nozzle in the direction of hydrogen gas ejection, which prevents powder from flowing out of the container body when hydrogen gas is ejected from the nozzle to the outside. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a portable gas stove that uses hydrogen gas as fuel while suppressing the occurrence of flashback, and a fuel container that supplies hydrogen gas to the portable gas stove. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view showing a cassette stove according to one embodiment of the present invention with a fuel container according to one embodiment of the present invention attached to it. [Figure 2] This is a cross-sectional view along the AA cutting line in Figure 1. [Modes for carrying out the invention]

[0010] Hereinafter, a cassette stove and fuel container according to one embodiment of the present invention (hereinafter referred to as "this embodiment") will be described with reference to the attached drawings. The embodiments described below are merely examples to facilitate understanding of the present invention and do not limit it. That is, the present invention can be modified and improved without departing from its spirit. Furthermore, it goes without saying that the present invention includes equivalents thereof.

[0011] Furthermore, in order to make the explanation easier to understand, the various parts of the cassette stove and fuel container are shown in the diagrams in a somewhat simplified or schematic manner. Also, the sizes (dimensions) and spacing between parts of the cassette stove and fuel container shown in the diagrams may differ from the actual product. Furthermore, in this specification, the meaning of “same” may include a range of errors that are generally acceptable in the art to which the present invention pertains. Furthermore, in this specification, "horizontal," "vertical," and "perpendicular" include a range of error that is permissible in the art to which the present invention pertains. For example, "horizontal," "vertical," and "perpendicular" in this specification mean within a range of less than ±10° from the exact "horizontal," "vertical," and "perpendicular" directions. Preferably, the error from the exact "horizontal," "vertical," and "perpendicular" directions is 5° or less, and more preferably 3° or less.

[0012] <<Example of the configuration of the portable gas stove according to this embodiment>> Referring to Figures 1 and 2, an example of the configuration of a portable gas stove according to this embodiment (hereinafter referred to as "portable gas stove 10") will be described. Cassette stove 10 is a portable gas stove that uses hydrogen gas as fuel. Because the Cassette Stove 10 uses hydrogen gas as fuel, it does not emit CO2 gas when the fuel (hydrogen gas) is burned, making it preferable from the perspective of carbon neutrality policies aimed at protecting the global environment compared to conventional fuel gases (butane gas, etc.). The portable gas stove 10 can heat objects to be heated, such as cooking equipment (e.g., griddles and pots), both indoors and outdoors.

[0013] Specifically, the cassette stove 10 supplies hydrogen gas to the burner section 20 described later in a state where it is blocked from air (strictly, oxygen gas), and mixes the hydrogen gas supplied to the burner section 20 with the air around the burner section 20 and burns it. In this way, the method of supplying fuel (hydrogen gas) to the burner section without mixing it with an oxidizer (air) and mixing the fuel with the oxidizer for the first time in the burner section shall be referred to as the "diffusion combustion method". On the other hand, the "premixed combustion method" used in the cassette stove etc. of Patent Document 1 described in the "Background Art" supplies the fuel and the oxidizer to the burner section in a pre-mixed state, which is different from the diffusion combustion method. Among the diffusion combustion methods, in particular, the method of mixing fuel with an oxidizer at the tip portion of the burner section (specifically, the nozzle section 22 described later) is also referred to as the "premixing combustion method".

[0014] "Air" means general air and means an aggregate of gases composed of nitrogen gas, oxygen gas, and other gases.

[0015] More specifically, as shown in FIG. 1, the cassette stove 10 includes a housing 11, a mounting portion 12, a pressure adjustment portion 13, a supply pipe 14 (corresponding to the supply portion), an operation portion 15, and a burner section 20.

[0016] In the following description, the state where the cassette stove 10 is placed on a horizontal surface is defined as the normal use state, and unless otherwise specified, when explaining the position of the cassette stove 10, as well as the orientation and extension direction of each part of the cassette stove 10, the position, orientation, and extension direction when the cassette stove 10 is in the normal use state shall be indicated. Also, in the following description, the direction perpendicular to the horizontal surface on which the cassette stove 10 is placed shall be the "vertical direction (perpendicular direction)". Therefore, FIG. 1 is a view seen from above in the vertical direction.

[0017] In this embodiment, the mounting section 12, pressure adjustment section 13, supply pipe 14, operating section 15, and burner section 20 are arranged in a direction along the aforementioned horizontal surface (the mounting surface on which the cassette stove 10 is placed), and in the example shown in Figure 1, when viewed from above, the sections 12-15 and 20 are positioned so as not to overlap with each other. However, this is not limited to this, and the positions of the sections 12-15 and 20 on the cassette stove 10 can be any position as long as the cassette stove 10 can perform its function, and for example, they may overlap with each other when viewed from above.

[0018] <Enclosure> As shown in Figure 1, the housing 11 is a box-shaped structure that houses the mounting section 12, the pressure adjustment section 13, the supply pipe 14, and the burner section 20. As shown in Figure 1, the upper wall (top panel) of the housing 11 has a mounting opening 11a and a burner opening 11b. The mounting opening 11a is formed at a position at least facing the mounting portion 12 in the vertical direction. This allows the user to attach the fuel container 100, described later, to the mounting portion 12 through the mounting opening 11a. The housing 11 may also be fitted with, for example, a cover (not shown) that opens and closes the mounting opening 11a. The burner opening 11b is formed in a position opposite the burner section 20 in the vertical direction. As a result, the nozzle section 22, which will be described later and constitutes the burner section 20, is exposed to the outside through the burner opening 11b.

[0019] Furthermore, the upper wall of the housing 11 is provided with multiple support parts 11c (trivets) (four in Figure 1) to support the object to be heated directly above the burner section 20. The four support parts 11c are arranged at intervals along the perimeter of the burner opening 11b. From the lower wall (bottom plate) of the housing 11, for example, multiple (e.g., four) legs (not shown) protrude, and the cassette stove 10 is placed on the mounting surface (horizontal surface) by contacting the mounting surface with these multiple legs (not shown).

[0020] The housing 11 may be constructed by integrally (seamlessly) forming each wall, such as the top wall, bottom wall, and side walls, which constitute the housing 11 as a box, or by joining each wall by welding, adhesive, or fastening with screws, etc. The material of the housing 11 may be any material that meets the heat resistance requirements for a portable gas stove 10, such as metal materials, resin materials, or combinations thereof.

[0021] <Mounting part> The mounting section 12 is used to mount a fuel container 100, which will be described later and is filled with hydrogen gas. More specifically, the mounting section 12 has a housing space for housing the fuel container 100 and a wall surrounding the housing space. The housing space of the mounting section 12 only needs to be shaped to accommodate the fuel container 100, and may, for example, be shaped to match the outer shape of the fuel container 100. The wall of the mounting section 12 may be composed of multiple wall sections, and these multiple wall sections may be formed integrally (seamlessly), or they may be joined by welding, adhesive, or fastening using screws, etc. Also, the wall of the mounting section 12 may be part of the housing 11, or it may be a part separate from the housing 11. The material of the mounting section 12 only needs to meet the heat resistance requirements for a portable gas stove 10, and may be, for example, a metal material, a resin material, or a combination thereof. Thus, by providing the mounting section 12 in the cassette stove 10, the fuel container 100 can be attached to the cassette stove 10, and as a result, the hydrogen gas sealed in the fuel container 100 can be properly supplied to the burner section 20.

[0022] <Pressure regulating section> The pressure adjustment unit 13 adjusts the pressure of the hydrogen gas supplied from the fuel container 100 attached to the mounting unit 12. As a result, the burner unit 20, which will be described later, is supplied with hydrogen gas whose pressure has been adjusted by the pressure adjustment unit 13. Furthermore, the pressure adjustment unit 13 may, for example, shut off the supply of hydrogen gas from the fuel container 100 to the burner unit 20 if the pressure in the fuel container 100 becomes higher than a predetermined pressure (for example, if it becomes an abnormal pressure). Furthermore, the pressure adjustment unit 13 may be configured to work in conjunction with the operating unit 15 (operating knob), which will be described later. Specifically, the pressure adjustment unit 13 may supply hydrogen gas from the fuel container 100 to the burner unit 20, adjust the pressure, supply amount, and supply speed of the supplied hydrogen gas, or shut off the supply of hydrogen gas by rotating the operating unit 15. Thus, by providing a pressure adjustment unit 13 in the cassette stove 10, pressure-adjusted hydrogen gas (hydrogen gas with adjusted supply amount) can be supplied to the burner unit 20, and as a result, the hydrogen gas can be properly burned in the burner unit 20.

[0023] <Supply pipe> The supply pipe 14 supplies hydrogen gas from the fuel container 100 attached to the mounting section 12 to the burner section 20 in a state where it is isolated from air, in other words, in a state where it is not mixed with air.

[0024] More specifically, the supply pipe 14 is a pipe component that connects the pressure adjustment unit 13 and the pipe 21, which will be described later and constitutes the burner unit 20. The supply pipe 14 supplies hydrogen gas, whose pressure has been adjusted in the pressure adjustment unit 13, to the pipe 21 while keeping it isolated from the air. One end of the supply pipe 14 in the extending direction is joined to the pressure adjustment unit 13 without any gaps. The other end of the supply pipe 14 in the extending direction is joined to the pipe 21 without any gaps. As a result, the hydrogen gas supplied from the pressure adjustment unit 13 to the pipe 21 is isolated from the air. The method of joining the supply pipe 14 and the pressure adjustment unit 13 is not particularly limited as long as no gaps are created between them, and may be joined by welding, for example. Similarly, the method of joining the supply pipe 14 and the pipe 21 is not particularly limited as long as no gaps are created between them, and may be joined by welding, for example.

[0025] The cross-sectional shape of the supply pipe 14 is not particularly limited and may be circular, elliptical, rectangular, a quadrilateral other than a rectangle, a polygon other than a quadrilateral, or an irregular shape. The "cross-section" of the supply pipe 14 refers to the cross-section perpendicular to the extension direction of the supply pipe 14. The material of the supply pipe 14 is not particularly limited and should meet the heat resistance and pressure resistance requirements for the cassette stove 10, for example, it may be a metal material (for example, stainless steel).

[0026] In this way, the cassette stove 10, by providing a supply pipe 14, can supply hydrogen gas to the burner section 20 without mixing it with air. This effectively suppresses the occurrence of flashback.

[0027] <Operation section> The control unit 15 is, for example, a control knob for the user to operate. As shown in Figure 1, the operating unit 15 is located on the side of the housing 11, and when viewed from above, for example, when viewed from the side wall of the housing 11, it is positioned on the opposite side from the pressure adjustment unit 13. For example, by rotating the operating unit 15 in a predetermined direction (e.g., clockwise), hydrogen gas with adjusted pressure, supply amount, and supply speed is supplied from the fuel container 100 to the burner unit 20. Also, as shown in Figure 1, an igniter 16 is located near the burner unit 20. For example, by rotating the operating unit 15 in a predetermined direction (e.g., clockwise), hydrogen gas is supplied to the burner unit 20, and the igniter 16 is pushed, generating a pulse voltage. This pulse voltage causes an electrode (not shown) located at the tip of the igniter 16 (the end on the burner unit 20 side) to discharge, igniting the hydrogen gas supplied to the burner unit 20. Also, for example, by rotating the operating unit 15 in the opposite direction to the predetermined direction (e.g., counterclockwise), the supply of hydrogen gas from the fuel container 100 to the burner unit 20 is stopped, and the burning hydrogen gas is extinguished.

[0028] <Burner section> The burner unit 20 mixes the hydrogen gas supplied from the supply pipe 14 with the air surrounding the burner unit 20 and burns it. More specifically, the burner section 20 has a pipe 21 and a nozzle section 22, as shown in Figure 1.

[0029] (pipe) Pipe 21 is an annular pipe (tube member). Hydrogen gas is supplied to pipe 21 from supply pipe 14. The path shape of pipe 21 is not particularly limited as long as it is annular, and when viewed from above, it may be any shape, for example, circular (donut-shaped), elliptical, rectangular, a quadrilateral other than a rectangle, a polygon other than a quadrilateral, or an irregular shape. In this embodiment, the path shape of pipe 21 will be described assuming that it is circular when viewed from above, as shown in Figure 1. Furthermore, the cross-sectional shape of the pipe 21 is not particularly limited and may be circular, elliptical, rectangular, a quadrilateral other than a rectangle, a polygon other than a quadrilateral, or an irregular shape. Note that the "cross-section" of the pipe 21 refers to the cross-section perpendicular to the extension direction of the pipe 21. In this embodiment, the explanation will be based on the assumption that the cross-sectional shape of the pipe 21 is circular, as shown in Figure 2. The material of pipe 21 is not particularly limited and should meet the heat resistance and pressure resistance requirements for the cassette stove 10, and may be a metal material (e.g., stainless steel). The material of pipe 21 may be the same type as the material of the supply pipe 14 that is joined to it, or it may be a different type. Furthermore, as mentioned above, pipe 21 is joined to supply pipe 14 without any gaps.

[0030] The cross-sectional areas of the supply pipe 14 and the pipe 21 may be the same or different. In other words, if the cross-sectional shapes of the supply pipe 14 and the pipe 21 are both circular, the diameters of the supply pipe 14 and the pipe 21 may be the same or different.

[0031] In this regard, the supply pipe 14 only needs to be able to supply hydrogen gas to the pipe 21, and therefore the diameter of the supply pipe 14 can be relatively small. On the other hand, in pipe 21, it is necessary to supply hydrogen gas evenly around the entire circumference of the annular pipe 21. If the diameter of pipe 21 is small, for example, variations may occur in the amount of hydrogen gas supplied in the circumferential direction (path direction) of pipe 21. Specifically, there may be variations in the amount of hydrogen gas released to the outside from the nozzle section 22, which will be described later, between the nozzle section 22 located closest to the supply pipe 14 and the nozzle section 22 located furthest from the supply pipe 14. This can be mitigated, for example, by making the diameter of pipe 21 relatively large, which can shift the above-mentioned variations at each nozzle section 22 to the smaller side. For this reason, it is preferable that the cross-sectional area (diameter) of pipe 21 is larger than the cross-sectional area (diameter) of supply pipe 14.

[0032] In the above explanation, the example given is that both the supply pipe 14 and the pipe 21 have circular cross-sectional shapes. However, the explanation is not limited to this, and the supply pipe 14 (pipe 21) may have a non-circular cross-sectional shape. In this case, the diameter of the supply pipe 14 (pipe 21) can be the diameter equivalent to a circle, that is, the diameter of a virtual circle corresponding to the cross-sectional area of ​​the supply pipe 14 (pipe 21) having a non-circular cross-section.

[0033] (Nozzle section) The nozzle section 22 is installed in the pipe 21 and releases hydrogen gas from inside the pipe 21 to the outside. The hydrogen gas passing through the nozzle section 22 mixes with the surrounding air to form a mixed gas, which is then ignited by the ignition device 16 and combusted. As shown in Figure 2, the nozzle section 22 is provided, for example, at the top of the pipe 21 and is exposed to the outside through the burner opening 11b as shown in Figure 1. In this embodiment, the nozzle section 22 has a plurality (four) of nozzle sections 22. The plurality of nozzle sections 22 are provided at predetermined intervals along the circumferential direction (path direction) of the annular pipe 21. In this embodiment, as shown in Figure 1, the four nozzle sections 22 are arranged at 90° intervals along the circumferential direction (path direction) of the pipe 21 when viewed from above or below. Note that the number of nozzle sections 22 is not limited to four, and may be one or a plurality other than four. Thus, in the cassette stove 10, by providing a nozzle portion 22 on the pipe 21, hydrogen gas can be released (burned) at any position in the circumferential direction (path direction) of the annular pipe 21.

[0034] To describe the nozzle section 22 in more detail, as shown in Figure 2, the nozzle section 22 has a plurality of (two in Figure 2) first openings 23, a box body 24, one or more (one in Figure 2) second openings 25, and a mesh member 26.

[0035] (First opening) Multiple (two) first openings 23 are formed on the upper part of the pipe 21, more specifically, as shown in Figure 2. The shape of the first openings 23 is not particularly limited and may be circular, elliptical, rectangular, a quadrilateral other than a rectangle, a polygon other than a quadrilateral, or an irregular shape. In this embodiment, the description will be based on the assumption that the shape of the first openings 23 is circular. Furthermore, in this embodiment, the distance between two adjacent first openings 23 (the distance between the centers of the two first openings 23) may be in the range of, for example, 5 mm to 10 mm. Also, the diameter of the first opening 23 may be in the range of, for example, 0.5 mm to 1.0 mm.

[0036] Thus, in the cassette stove 10, the hydrogen gas flowing from the pipe 21 towards the nozzle section 22 is passed through multiple first openings 23, thereby promoting turbulence of the hydrogen gas. This promotes mixing (diffusion mixing) of the hydrogen gas with the air surrounding the nozzle section 22, and as a result, the hydrogen gas can be properly burned. In other words, the nozzle section 22 having multiple first openings 23 promotes so-called turbulent diffusion combustion.

[0037] (box body) As shown in Figure 2, the box body 24 encloses the multiple first openings 23 from the outside of the pipe 21, thereby shielding the multiple first openings 23 from the outside. The box body 24 is positioned on top of the pipe 21. The box body 24 is, for example, a box body with one end open, and its shape is not particularly limited, but in this embodiment, it will be described assuming that it is a rectangular parallelepiped shape. In this embodiment, one end (open end) of the box body 24 faces downward (towards the pipe 21) and is joined to the outer surface of the pipe 21 without any gaps, for example by welding. The material of the box body 24 is not particularly limited and should meet the heat resistance and pressure resistance requirements for the cassette stove 10, for example, it may be a metal material (for example, stainless steel). The material of the box body 24 may be the same type as the material of the pipe 21 that is joined to it, or it may be a different type.

[0038] (Second opening) One or more second openings 25 are formed in the box body 24, and more specifically, as shown in Figure 2, they are formed at the other end of the box body 24 (corresponding to the upper end of the box body 24) opposite to the open end of the box body 24 (corresponding to the lower end of the box body 24). The number of second openings 25 only needs to be less than the number of first openings 23. In this embodiment, since there are two first openings 23, there is one second opening 25. For example, if there are three first openings 23, the number of second openings 25 may be one or two. As shown in Figure 1, the second opening 25 may be located, for example, between two adjacent first openings 23 when viewed from above or below. The shape of the second opening 25 is not particularly limited and may be, for example, circular, elliptical, rectangular, a quadrilateral other than a rectangle, a polygon other than a quadrilateral, or an irregular shape. In this embodiment, the description will be based on the premise that the shape of the second opening 25 is circular. The diameter of the second opening 25 may be in the range of, for example, 0.5 mm to 1.0 mm.

[0039] In this way, the cassette stove 10 releases hydrogen gas that has flowed into the box body 24 from the pipe 21 through multiple first openings 23 to the outside through one or more second openings 25. Here, as mentioned above, the number of second openings 25 is less than the number of first openings 23. This allows hydrogen gas, whose turbulent diffusion combustion has been promoted in multiple first openings 23, to be concentrated in one or more second openings 25. In other words, in each second opening 25, the flow rate of hydrogen gas passing through can be increased while the flow velocity of the hydrogen gas passing through can be decreased compared to each of the first openings 23. As a result, the hydrogen gas can be burned stably and appropriately. Thus, in the nozzle section 22, turbulent diffusion combustion is promoted through multiple first openings 23, while at the same time, hydrogen gas is concentrated through one or more second openings 25, allowing for stable and appropriate combustion of hydrogen gas. In other words, the flame produced when hydrogen gas is burned can be shaped and sized appropriately.

[0040] (Mesh material) As shown in Figure 2, the mesh member 26 is arranged inside the box body 24. The mesh member 26 is constructed, for example, by weaving wires into a mesh pattern and has numerous fine holes. The material of the mesh member 26 is not particularly limited and can be any material that satisfies the heat resistance and pressure resistance requirements for the cassette stove 10, such as metal. The mesh member 26 is located between the multiple first openings 23 and the second opening 25, and surrounds the multiple first openings 23. The ends of the mesh member 26 are joined to the outer surface of the pipe 21, for example, by welding. However, the ends of the mesh member 26 may also be joined to the box body 24, for example, by welding. The mesh member 26 is pressed against the pipe 21 by the box body 24, and in the example shown in Figure 2, it is in contact with the inner surface of the box body 24.

[0041] In this way, the cassette stove 10 allows hydrogen gas that flows from the pipe 21 into the box 24 through multiple first openings 23 to pass through the mesh member 26 and then be released to the outside through one or more second openings 25. Here, because the nozzle section 22 is equipped with a mesh member 26, the hydrogen gas collides with the mesh member 26, further promoting turbulence of the hydrogen gas. As a result, the combustion of hydrogen gas (turbulent diffusion combustion) can be further promoted.

[0042] As explained above, the cassette stove 10 uses a diffusion combustion method (pre-mixed combustion method) to isolate hydrogen gas from the air in the path from the fuel container 100 to the burner unit 20, and then mixes the hydrogen gas with the air surrounding the burner unit 20 for combustion. Therefore, compared to using a pre-mixed combustion method, specifically when the fuel gas and air are mixed in advance in a mixing tube and the resulting mixture is supplied to the burner, the occurrence of flashback can be suppressed.

[0043] Furthermore, because the cassette stove 10 burns hydrogen gas, it can generate high-temperature steam. Therefore, by utilizing this high-temperature steam, for example, when cooking meat and fish using the cassette stove 10, the moisture loss of the food can be suppressed, thus preserving its deliciousness.

[0044] <<Example of fuel container configuration according to this embodiment>> Next, an example of the configuration of the fuel container 100 according to this embodiment will be described. The fuel container 100 is, for example, a small gas cylinder that contains hydrogen gas. As shown in Figure 1, an outlet 100a is provided at one end of the fuel container 100. The outlet 100a is an opening for ejecting hydrogen gas from the container body 101, which will be described later, to the outside. More specifically, when the fuel container 100 is attached to the mounting part 12 of the cassette stove 10, and the user rotates the operating part 15 in a predetermined direction (for example, clockwise), hydrogen gas is ejected from the outlet 100a of the fuel container 100, and the ejected hydrogen gas is supplied to the pressure adjustment part 13.

[0045] More specifically, as shown in Figure 1, the fuel container 100 includes a container body 101, powder 102, and a filter 103.

[0046] <Container body> The container body 101 is, for example, a pressure-resistant vessel, and its shape and material are not particularly limited.

[0047] <Powder> The powder 102 is contained within the container body 101 and is a powder that stores (absorbs) and releases hydrogen gas. By storing the hydrogen gas in the container body 101 in the powder 102, the pressure inside the container body 101 can be lowered compared to when the hydrogen gas is sealed inside the container body 101 as a gas. The powder 102 is preferably a powder that, for example, reduces the pressure of the hydrogen gas inside the container body 101 (both storage pressure and release pressure) to less than 1 MPa at room temperature (e.g., 5°C to 35°C). Examples of powder 102 include powders composed of metal alloys, metal complex compounds, and metal-organic structures, and for example, powder composed of LaNi5 alloy.

[0048] Note that the volume of the powder 102 increases when hydrogen gas is stored. For this reason, the internal volume of the container body 101 of the fuel container 100 is made larger than the volume of the powder 102 when it expands due to the storage of hydrogen gas. For example, the internal volume of the container body 101 is 0.5 × 10⁻⁶. ―3 m 3If the amount is within this range, then it is sufficient to place 1.5 to 2.0 kg of the powder 102, which is composed of LaNi5 alloy, inside the container body 101.

[0049] In cassette stoves that use a premixed combustion method with butane gas as fuel, the butane gas (for example, about 250g) is liquefied and sealed inside the fuel container, keeping the inside of the container at room temperature and below a specified pressure (specifically, 1MPa). On the other hand, in the fuel container 100 of this embodiment, as described above, the container body 101 contains powder 102 and stores hydrogen gas in the powder 102, thereby making it possible to maintain the inside of the container body 101 at room temperature and below a predetermined pressure (specifically, 1 MPa).

[0050] <filter> The filter 103 prevents the powder 102 from flowing out of the container body 101 when hydrogen gas is ejected to the outside from the nozzle 100a. As shown in Figure 1, the filter 103 is located upstream of the nozzle 100a in the direction of hydrogen gas ejection. The filter 103 is constructed, for example, by weaving wires into a mesh, and has numerous fine pores. The diameter of the pores in the filter 103 is smaller than the diameter of the powder 102. The material of the filter 103 is not particularly limited and should meet the heat resistance and pressure resistance requirements for the cassette stove 10, for example, it may be a metal material.

[0051] In this way, the fuel container 100 is equipped with a filter 103, which prevents the powder 102 from flowing out of the container body 101. This allows hydrogen gas to be properly sealed inside the container body 101 while maintaining the temperature inside the container body 101 at room temperature and below a predetermined pressure (e.g., 1 MPa). Furthermore, it prevents the powder 102 from flowing into the cassette stove 10 (e.g., the pressure adjustment unit 13) and causing malfunctions in the cassette stove 10. [Explanation of symbols]

[0052] 10 portable gas stoves 11 cabinets 11a Opening for mounting 11b Burner opening 11c Support part (trivet) 12 Mounting part 13 Pressure adjustment section 14. Supply pipe (corresponding to the supply section) 15 Control section 16. Ignition device (igniter) 20 Burner section 21 pipes 22 Nozzle section 23 First opening 24 Box body 25. Second opening 26 Mesh members 100 fuel container 100a spout 101 Container body 102 Powder 103 Filters

Claims

1. A portable gas stove that uses hydrogen gas as fuel, A portable gas stove that supplies hydrogen gas to the burner while keeping it isolated from the air, and then mixes the hydrogen gas supplied to the burner with the surrounding air for combustion.

2. A mounting section to which a fuel container filled with hydrogen gas is attached, The system includes a supply unit that supplies hydrogen gas from the fuel container attached to the mounting part to the burner part while keeping it isolated from the air, The cassette stove according to claim 1, wherein the burner section mixes hydrogen gas supplied from the supply section with the air surrounding the burner section and burns it.

3. The mounting portion is further equipped with a pressure adjustment unit that adjusts the pressure of hydrogen gas supplied from the fuel container attached to the mounting portion, The cassette stove according to claim 2, wherein hydrogen gas, whose pressure has been adjusted by the pressure adjustment unit, is supplied to the burner unit.

4. The aforementioned burner section is, A ring-shaped pipe through which hydrogen gas is supplied, The cassette stove according to claim 1, further comprising a nozzle provided on the pipe for releasing hydrogen gas from the pipe to the outside.

5. The nozzle portion is Multiple first openings formed in the pipe, A box body that surrounds the plurality of first openings from the outside of the pipe, thereby shielding the plurality of first openings from the outside, The box body is formed and has one or more second openings, which are fewer in number than the plurality of first openings, The cassette stove according to claim 4, wherein hydrogen gas that has flowed into the box from the pipe through the plurality of first openings is released to the outside through one or more second openings.

6. The nozzle portion further comprises a mesh member arranged inside the box, The cassette stove according to claim 5, wherein hydrogen gas that flows into the box from the pipe through the plurality of first openings is passed through the mesh member and then released to the outside through one or more second openings.

7. A fuel container for supplying hydrogen gas to a portable gas stove according to any one of claims 1 to 6, The container body and A fuel container comprising a powder housed within the container body for storing and releasing hydrogen gas.

8. The container body includes an outlet for ejecting hydrogen gas to the outside, The fuel container according to claim 7, further comprising: a filter located upstream of the nozzle in the direction of hydrogen gas ejection, which prevents the powder from flowing out of the container body when hydrogen gas is ejected to the outside from the nozzle.

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