Portable fireplace

Abstract

The invention discloses a portable fireplace. A portable fireplace for combusting a combustible fuel comprises: an outer wall defining a lower portion and a tower portion; and an inner wall separated from the outer wall by an air gap and defining an incineration chamber within the lower portion and a chimney within the tower portion. The portable fireplace further comprises: a fireplace opening passing through the outer wall and the inner wall; the fireplace frame is located below the fireplace opening and protrudes outwards from the outer wall; the air inlet through holes are formed in the outer wall; and the air outlet through holes are formed in the inner wall in the incineration chamber.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Patent Application No. 18 / 815,451, filed on August 26, 2024, and claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 582,607, filed on September 14, 2023, both of which are hereby incorporated by reference in their entirety into this application as if fully incorporated herein. Technical Field

[0003] The subject matter described in this application relates to a portable device for burning solid fuel to provide light, heat and ambiance. This portable fireplace has particular, but not exclusive, use for outdoor gatherings. Background Art

[0004] Conventional stoves, despite having raised chimneys, often emit excessive smoke that affects the user's enjoyment and experience. In addition, they may be molded or cast in a manner that does not allow for easy cleaning. It should be recognized, therefore, that such commonly used stoves have many disadvantages that affect the user experience. Therefore, there is a need for improved outdoor combustion-based lighting and heating products that address the above and other issues.

[0005] The information contained in the background section of the specification, including any references cited in this application and any description or discussion thereof, is for technical reference purposes only and should not be construed as subject matter by which the scope of the present disclosure is limited. Summary of the invention

[0006] The present disclosure is a portable fireplace that can be used as an outdoor fireplace to provide heat, light and ambiance to a backyard, park, campground, etc. The modular portable fireplace can burn sticks, logs, etc. and uses primary and secondary combustion to increase heat and light output while reducing smoke production. The modular portable fireplace includes a base, a burning chamber, a mantel, a chimney and a fireplace opening, as well as a removable fuel grate and a removable ash tray. The portable fireplace also includes a double wall design that allows air flow for a more thorough burn and reduces the temperature of the outer surface of the portable fireplace.

[0007] One general aspect includes a portable fireplace for burning a combustible fuel. The portable fireplace includes an outer wall defining a lower portion and a tower portion. The portable fireplace also includes an inner wall separated from the outer wall by an air gap and defining a combustion chamber in the lower portion and a chimney in the tower portion. The portable fireplace also includes a fireplace opening extending through the outer wall and the inner wall. The portable fireplace also includes a fireplace mantel disposed below the fireplace opening and projecting outwardly from the outer wall. The portable fireplace also includes a plurality of air inlet apertures disposed on the outer wall. The portable fireplace also includes a plurality of air outlet apertures disposed on the inner wall within the combustion chamber.

[0008] In some embodiments, the portable fireplace includes a plurality of air inlet holes configured to draw air from an environment outside the portable fireplace, and a plurality of air outlet holes for communicating with the air inlet holes and the air gap. The plurality of air outlet holes may be arranged on an inner wall of the incineration chamber below the opening.

[0009] Embodiments may include one or more of the following functions. The portable fireplace may include a base that is different from the outer wall and is arranged at the bottom of the outer wall. The portable fireplace may include a deflector that is arranged in the chimney above the fireplace opening. The portable fireplace may include a removable fuel grate that is arranged in the incineration chamber. The portable fireplace may include a removable ash tray that is arranged below the removable fuel grate. The inner wall, the outer wall, the air gap, the removable ash tray and the removable fuel grate may be configured so that air entering through the multiple air inlet holes is discharged through both the multiple air outlet holes and the multiple ventilation holes in the removable fuel grate. The air discharged through the multiple ventilation holes in the removable fuel grate can contribute to the primary combustion of the fuel arranged on the removable fuel grate. The air discharged through the multiple air outlet holes can support the secondary combustion of gases, smoke and soot emitted by the fuel. The fuel may include wood, paper or cardboard. The fuel may include sticks or logs.

[0010] One general aspect includes a method of burning a combustible fuel. The method includes providing a structure that may include: an outer wall that defines a lower portion and a tower portion; an inner wall that is separated from the outer wall by an air gap and defines a combustion chamber in the lower portion and a chimney in the tower portion; a fireplace opening that passes through the outer wall and the inner wall; a fireplace shelf that is disposed below the fireplace opening and protrudes outwardly from the outer wall; and a plurality of air intake apertures that are disposed on the lower portion of the outer wall. The method also includes drawing air through the plurality of air intake apertures. The method also includes discharging a first portion of the air into the lower portion of the combustion chamber to support primary combustion of the fuel. The method also includes discharging a second portion of the air into the upper portion of the combustion chamber to support secondary combustion of gases, smoke, and soot emitted during the primary combustion of the fuel.

[0011] Embodiments may include one or more of the following functions. The method may include providing a base different from the outer wall and positioning the bottom of the outer wall on top of the base. The method may include arranging a deflector in the chimney above the fireplace opening. The method may include supporting the fuel on a removable fuel grate arranged in the incineration chamber. The method may include collecting the ashes of the primary and secondary incinerations in a removable ash tray, which is arranged in the incineration chamber below the removable fuel grate. Each removable fuel grate and removable ash tray can be removed from the incineration chamber via the fireplace opening. The fuel may include wood, paper or cardboard. The fuel may include sticks or logs.

[0012] One general aspect includes a system for burning a combustible fuel to provide light and heat. The system includes a double-walled body defining a lower portion and a tower portion. The system also includes an incineration chamber disposed within the lower portion. The system also includes a chimney disposed within the tower portion. The system also includes an air gap disposed between the walls of the double-walled body. The system also includes a fireplace opening disposed within the tower portion. The system also includes a fireplace mantel disposed below the fireplace opening and protruding outwardly from the double-walled body. The system also includes a plurality of air inlet apertures disposed on an outer surface of the lower portion. The system also includes a plurality of air outlet apertures disposed on an inner surface of the incineration chamber. The system also includes a base that is distinct from the double-walled body and disposed at a bottom of the double-walled body. The system also includes a deflector disposed within the chimney above the fireplace opening. The system also includes a removable fuel grate mounted within the incineration chamber. The system also includes a removable ash tray disposed below the removable fuel grate.

[0013] Embodiments may include one or more of the following features. In some embodiments, the double wall, air gap, removable plate, and removable fuel grate are configured such that air entering through the plurality of air inlet holes is discharged through both the plurality of air outlet holes and the plurality of vents in the removable fuel grate, wherein the air discharged through the plurality of vents in the removable fuel grate assists in primary combustion of fuel disposed on the removable fuel grate. The air discharged through the plurality of air outlet holes supports secondary combustion of gases, smoke, and soot emitted by the fuel.

[0014] One general aspect includes a portable fireplace for burning a combustible fuel. The portable fireplace includes a lower portion, which may include: an outer wall; an inner wall separated from the outer wall by an air gap and defining a combustion chamber; and a fuel grate configured to support the fuel and define a portion of the combustion chamber. The portable fireplace also includes a chimney disposed above the lower portion, the chimney being arranged to extract smoke from the combustion chamber therethrough. The portable fireplace also includes a fireplace opening located in one of the lower portion and the chimney, the fireplace opening being disposed at a height above the fuel grate and providing visually lateral access to the interior of the combustion chamber. The portable fireplace also includes an air inlet aperture located in one of the lower portion and the chimney, the air inlet aperture being configured to draw air from outside the portable fireplace into the air gap between the outer wall and the inner wall. The portable fireplace also includes a first air outlet aperture configured to introduce the extracted air at a height below the fuel grate to supply flames to the fuel on the fuel grate and cause primary combustion of the fuel to occur. The portable fireplace also includes a second air outlet hole, which is arranged on the inner wall and is used to introduce air into the combustion chamber at a height above the fuel grate to assist the secondary combustion of the fuel. The second air outlet hole is fluidly connected to the air gap between the outer wall and the inner wall, and is fluidly connected to the air inlet hole, and is configured to provide a passage for air through the chimney.

[0015] Embodiments may include one or more of the following functions. In some embodiments, the first air outlet hole is in fluid communication with the air inlet hole. The portable fireplace may include a base that forms a portion of the lower portion, and the air inlet hole is arranged on an outer surface of at least one of the outer wall and the base. The portable fireplace may include a second air inlet hole that is in fluid communication with the first air outlet hole. The second air outlet hole may be arranged at a height below the fireplace opening. The second air outlet hole may be arranged at a height above the fireplace opening.

[0016] In some examples, a portable fireplace for burning combustible fuel may include an outer wall and an inner wall, the inner wall being separated from the outer wall by an air gap and defining a combustion chamber. A fuel grate may be configured to support the fuel and define a portion of the combustion chamber. A fireplace opening may pass through the inner wall and the outer wall, the fireplace opening being arranged at a height above the fuel grate and providing a visually lateral passage to the interior of the combustion chamber. An open top may be configured to transfer convective heat when the fuel burns on the fuel grate. A first air outlet hole may be configured to introduce air into the combustion chamber at a height below the fuel grate to supply flames to the fuel on the fuel grate and cause primary combustion of the fuel, and a second air outlet hole may be arranged at a height above the fuel grate to assist in secondary combustion of the fuel, the second air outlet hole being in fluid communication with the air gap between the outer wall and the inner wall.

[0017] In some aspects, the air inlet aperture can be in fluid communication with at least one of the first air outlet aperture and the second air outlet aperture to draw air for fuel combustion on the fuel grate. In some aspects, the inner wall includes an infrared reflective surface opposite the fireplace opening, the infrared reflective surface configured to reflect radiant energy out of the fireplace opening. In some aspects, a reflective redirector can face the infrared reflective surface opposite the fireplace opening, the reflective redirector configured to reflect radiant energy to the infrared reflective surface opposite the fireplace opening.

[0018] This Summary is provided to introduce a selection of concepts in a simplified form that are further described in the Detailed Description below. This Summary is not intended to identify key features or essential characteristics of the claimed subject matter, nor is it intended to limit the scope of the claimed subject matter. The features, details, utilities, and advantages of the modular portable fireplace, as defined by the claims, are provided in the following written description of various embodiments of the disclosure and are illustrated in the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Illustrative embodiments of the present disclosure will be described with reference to the accompanying drawings, in which:

[0020] Figure 1 is an upper right perspective view of an exemplary modular fireplace (also referred to herein as a stove) according to at least one embodiment of the present disclosure;

[0021] Figure 2 is a front exploded view of an exemplary modular fire according to at least one embodiment of the present disclosure;

[0022] Figure 3 is an exemplary representation of a grate or fuel grate for a furnace according to at least one embodiment of the present disclosure;

[0023] Figure 4 is a perspective view of a bottom portion of an exemplary ember tray and a support tray of a modular fire pit according to at least one embodiment of the present disclosure;

[0024] Figure 5 is a side view of an exemplary modular fire according to at least one embodiment of the present disclosure;

[0025] Figure 6 is a side cross-sectional view of an exemplary modular fire according to at least one embodiment of the present disclosure;

[0026] Figure 7 is a front cross-sectional view of an exemplary modular fire according to at least one embodiment of the present disclosure;

[0027] Figure 8 is a front cross-sectional view of at least a portion of an exemplary modular fire according to at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] According to at least one embodiment of the present disclosure, a portable fireplace is provided that can be used as an outdoor fireplace to provide heat, light and atmosphere in a backyard, park, campground, etc. The portable fireplace can burn wood (such as sticks, logs, branches, etc.), paper, cardboard and other fuels, and use primary and secondary combustion to increase heat and light output and reduce smoke generation. The portable fireplace includes a base, a combustion chamber, a mantel, a chimney and a fireplace opening, as well as a fuel grate and an ash tray, which can be removed when the portable fireplace is cooled to easily empty the ashes produced during the combustion process. The modular portable fireplace also includes a double-wall design that allows air flow to achieve a more thorough combustion and reduces the temperature of the outer surface of the portable fireplace. The top of the portable fireplace includes a flame ring, which affects the flow of hot air, thereby improving combustion.

[0029] In certain embodiments, the portable fireplace can be made of stainless steel (e.g., some components are made of rolled and welded steel sheets, while other components are stamped from sheet metal blanks), thereby providing a lightweight, portable design that can be effortlessly moved from one location to another. However, other materials, including metals, ceramics, polymers, and composites, may be used instead or in addition.

[0030] The modular portable fireplace provides a shallow burning chamber so that the flames are easily visible through the fireplace opening (and the heat is easily accessible), while the smoke produced during the burning process generally rises vertically through the chimney so as not to disturb people standing or sitting around the portable fireplace. In addition, the dual combustion characteristics of the primary and secondary combustion described herein can reduce the smoke produced by the portable fireplace.

[0031] In the example shown, the fuel grate (also called a grate) and the ember pan are removable through the front opening or fireplace opening. In one example, the fireplace opening is sized so that the ember pan can pass through the fireplace opening in a flat horizontal orientation. The fireplace opening can be sized so that the grate can be removed by rotating the fuel grate through a small angle. In some embodiments, the tower or upper portion is a unit with the incineration or lower portion. In other embodiments, the tower or upper portion can be a separate, removable component.

[0032] These descriptions are for illustrative purposes only and should not be considered to limit the scope of the modular portable fireplace. Certain features may be added, deleted, or modified without departing from the spirit of the claimed subject matter.

[0033] In order to promote an understanding of the principles of the present disclosure, reference will now be made to the embodiments shown in the accompanying drawings and specific language will be used to describe these embodiments. Nevertheless, it will be understood that there is no intention to limit the scope of the disclosure. Any changes and further modifications to the described devices, systems and methods, as well as any further applications of the principles of the present disclosure, have been fully considered and included in the present disclosure, as would normally occur to a person skilled in the art to which the present disclosure relates. In particular, it has been fully considered that the features, components and / or steps described with respect to one embodiment can be combined with the features, components and / or steps described with respect to other embodiments of the present disclosure. However, for the sake of brevity, multiple iterations of these combinations are no longer described separately.

[0034] Figure 1 1 is an upper right perspective view of an example portable, modular fireplace 150 according to at least one embodiment of the present disclosure. In this embodiment, the fireplace 150 is also referred to herein as a stove 150. The modular stove 150 can be used as an outdoor fireplace in a backyard, park, campground, etc. The modular stove 150 includes a base or stand 110, a lower or incineration section 155, and an upper, tower or chimney section 160. In some embodiments, the lower or incineration section 155 and the upper, tower or chimney section 160 are a single unit. In other embodiments, the upper, tower or chimney section 160 is a separate unit that can be removed from the lower or incineration section 155.

[0035] The lower or burning section 155 is located on the base or support 110 and, in this embodiment, includes: a mantel 170; a fuel grate or grate 100 to support the combustible fuel; a combustion chamber 190 in which the fuel is burned; a plurality of lower vents 122 that draw cool air from the outside; and a plurality of upper vents 124 that emit hot air radially inwardly into the combustion chamber to ignite unburned gases and particulate matter rising from the fuel. This secondary combustion increases the light and heat output of the modular stove while reducing smoke emissions.

[0036] The upper portion or tower 160 includes a front opening or fireplace opening 180 , a chimney 165 , and a flame ring 130 , which shapes the flow of rising air and can improve the combustion of fuel while directing smoke away from people sitting around the modular fire pit 150 .

[0037] The modular stove 150 includes a double wall design including an outer wall or body 120 and an inner wall or body 140 separated by a gap or space. This double wall design facilitates secondary combustion (as shown below). Figure 8), while also allowing the outer surface of the modular fire stove 150 to remain cool during the burning of the fuel. Similarly, the base or support 110 prevents the bottom surface 125 of the outer wall 120 from contacting the surface 127 (e.g., the ground, patio, driveway, etc.) on which the modular fire stove 150 is placed, thereby limiting unnecessary heat transfer between the outer wall 120 and the ground 127. Because the fire stove is portable, the base or support can form feet therein, and the base or other portion of the fire stove can form a handle or handle thereon, allowing the user to more easily pick up the fire stove and move it to a desired location. The weight of the fire stove is between 8 and 60 pounds, allowing it to be moved in a backyard, campsite, park, or other space.

[0038] It should be noted that the examples described herein are for illustration purposes only and are not intended to be limiting. Other devices and / or device configurations may be used to perform the operations described herein.

[0039] Figure 2 1 is a front exploded view of an exemplary modular fire place 150, according to at least one embodiment of the present disclosure. Visible are a flame ring 130, an inner body or wall 140, an outer body or wall 120, a removable fuel grate or grate 100, a mantel 170, and a base 110. The outer wall 120 includes an outer fireplace opening 180o and a plurality of air inlet apertures 122. The plurality of air inlet apertures 122 can be configured to draw air from the environment outside the portable fireplace. The inner wall 140 includes an inner fireplace opening 180i and a plurality of air outlet apertures 124.

[0040] Opposite the fireplace opening 180i, the inner wall 140 forms a reflective inwardly facing rear wall surface 181. The reflective rear wall surface 181 can be formed of a metal sheet, metal plate, or other reflective material (whether metallic or non-metallic). In some examples, the rear wall surface 181 can include a reflective finish or a high emissivity coating that is suitable for promoting the reflection of radiant energy from the inner wall, through the combustion chamber, toward the fireplace opening 180. In one example, the reflective finish can include a matte finish ceramic coating that radiates the absorbed heat. Ultimately, this reflected infrared radiation from the rear wall surface 181 passes through the fireplace opening 180 to heat the air and the user surrounding the fireplace opening 180.

[0041] The highly reflective coating on the rear wall surface 181 of the inner wall 140 promotes increased reflection of radiant energy from the inner wall 140 laterally outward away from the device through the fireplace opening 180. There are many commercially available highly reflective coatings known in the art as highly reflective finishes. In some embodiments, a polished reflective metal coating can also be used on the rear wall surface of the outer wall 140 to promote reflection of radiant energy.

[0042] The top ring 135 is attached to the top of the outer wall 120 and the top of the inner wall 140, combining them into a whole. The flame ring 130 is generally located on the top of the top ring 135. In some embodiments, the flame ring becomes a part of the top ring.

[0043] This embodiment includes a deflector 210 that can be attached to the interior wall 140 and located above the interior fireplace opening 180i. For safety and aesthetic reasons, the deflector 210 interrupts the symmetry of the flames produced by the burning fuel, to some extent directing them away from the fireplace opening 180. A gasket 185 (e.g., made of a heat-resistant material such as silicone or rock wool) covers the top and side edges of the outer fireplace opening 180o to prevent accidental contact between a user's hand and the hot edge of the outer fireplace opening 180o. The lower edge of the outer fireplace opening 180o is covered by the mantel 170.

[0044] Also visible is a support tray 220 in which a removable ash tray 230 is mounted, as shown below. Figure 6-8 shown.

[0045] Figure 3 is an exemplary representation of a grate or fuel grate 100 for the fire according to at least one embodiment of the present disclosure. In the example shown in the figure, the grate is a circular convex ventilated dome-shaped structure 325 surrounded by a rigid outer ring 315. The outer ring 315 includes an outer edge 310, which has a downward lip or flange 312, which provides rigidity, is located at the bottom edge of the inner wall 140 (for example, by fitting the upward lip or flange), and makes the outer edge 310 of the grate 100 more difficult to dent, warp or deform. The outer edge 310 can define the central vertical axis 270 of the grate 100. In this example, the grate 100 also includes a central hub 320 that protrudes above the outer edge 310. The ventilated dome 325 reaches the outer edge of the central hub 320 from the inner edge 318 of the rigid outer ring 315. The ventilated dome 325 includes a plurality of ventilation holes 330 , and in some embodiments, the rigid outer ring 315 is devoid of ventilation holes.

[0046] The grate 100 has an outer diameter D1 that matches the inner diameter of the inner wall 140. The dome 325 has an outer diameter D2 that is smaller than D1. In one example, the grate 100 includes 258 circular ventilation holes 330, each having a diameter of approximately 10 mm. Other numbers and sizes of holes may be used (e.g., 50–800 holes, each having a diameter between 0.5 cm and 1.5 cm). While more holes and / or larger holes means better overall ventilation, it may mean less structural material and therefore a weaker overall structure of the ventilated dome 325 and grate 100. Because better ventilation may result in higher incineration temperatures, the structure may be further weakened due to a combination of thermal softening and thermal expansion. A weaker structure may be less able to support firewood or other fuel piled thereon (see Figure 1 ) weight, and may collapse or warp more easily. Conversely, while fewer holes and / or smaller holes may produce a stronger overall structure and better ability to support firewood or other fuels, it may also result in poorer ventilation, resulting in lower burning temperatures, reduced head output, and increased smoke production.

[0047] Figure 3 The grate 100 in the example shown in FIG. 1 may also include a plurality of radial reinforcement ribs 350 extending from the outer reinforcement ring 315 to or partially extending to the central hub 320. Figure 2 In the example shown, six ribs 350 extend all the way to the central hub 320. Depending on the implementation, other lengths or numbers of ribs 350 may be used, including some ribs of a first length and others of a second or third length. It is worth noting that adding more radial ribs 350 may result in less space for ventilation holes, while removing radial ribs 350 may result in a weaker, less rigid structure that is more susceptible to crushing and / or warping.

[0048] In addition to the plurality of ventilation holes 330, the ventilated dome 325 also includes a concentric reinforcement ring 360 that is ventilated at ambient temperatures and when a fire is burning in the modular stove 150 including a grate (see Figure 1) to provide additional strength, rigidity, and stability to the structure of the grate 100 at operating temperatures of . In some embodiments, the reinforcement ring 360 has a higher profile than the reinforcement ribs 350. In other embodiments, the grate 100 may include multiple reinforcement rings. For example, some embodiments include 2 to 5 reinforcement rings. More reinforcement rings are contemplated. However, increasing the number of reinforcement rings may reduce the number or size of the vents 330 (with the effects described above), or reduce the spacing between the vents 330, which may weaken the structure of the grate 100. In other embodiments, the grate 100 may not include reinforcement rings, which may produce a weaker, less rigid structure, but such a structure may have more space for vents. In some embodiments, the center hub 320 is not present.

[0049] In one example, the hub 320, the reinforcing ribs 350, and the reinforcing rings 360 are stamped or pressed into the material of the grate (e.g., stainless steel), although other manufacturing methods may be used. In one example, the dome 325 is a spherical section with a radius of curvature greater than one-half the width or diameter of the grate. In one example, the grate 100 is formed from a flat circular blank by a stamping process. In one example, the holes 330 are also formed by a stamping process, although they may alternatively be produced by drilling, laser cutting, or other methods.

[0050] In some embodiments, one or more holes 330 may overlap with one or more reinforcing ribs 350 or reinforcing rings 360. However, in other embodiments, the hole, rib, and ring patterns have been selected so that no hole 330 overlaps with any rib 350 or ring 360.

[0051] exist Figure 3 In the example shown, the removable grate 100 also includes two gripping features, shown as handles 380 in this example. In other embodiments, the gripping features are formed to dock with the grate removal tool. As shown, the handle is formed as an opening larger than the vent 330. In the embodiment shown, the size and shape of each handle or opening 380 are used to accommodate a person's finger, thereby serving as a handle for lifting the removable grate 100 from the modular stove 150 through the cavity or combustion chamber 190 from the modular stove. The size or shape of the handle 380 may be different from that shown herein, and may have different quantities. For example, the grate may include one handle, three handles, or more handles.

[0052] Figure 4is a perspective view of an exemplary ember tray 230 and a bottom 475 of a support tray 220 of a modular fire according to at least one embodiment of the present disclosure. The diameter D3 of the ember tray 230 is less than the diameter D1 of the grate and can be comparable to the diameter D2 of the ventilated dome portion 325 of the grate 100. In some embodiments, the ventilated portion of the grate (e.g., the ventilated dome portion 325) includes a width (e.g., diameter) that is equal to or less than the width of the ember tray. Thus, as the fuel burns into embers, the embers can fall through the vent holes 330 in the dome portion 325 of the grate 100 and then fall downward into the ember tray 230. The interior volume of the ember tray 230 determines how much ashes 162 it can hold before it needs to be emptied. The interior volume of the ember tray 230 is determined at least in part by the height H and diameter D3 of the ember tray 230.

[0053] The ash tray 230 includes a side wall 402 and a bottom 404. The side wall 402 includes an upper lip 410, which may be a rolled or folded lip, for example. Figure 4 In the example shown, the ash tray bottom 404 includes an upwardly projecting central hub 420, three radially reinforcing arms 430, and three downwardly projecting feet 440 disposed at or near an outer edge 450 of the ash tray bottom 404. Other sizes, shapes, and numbers of feet may be used instead of or in addition to the above. Figure 4 For example, some embodiments include only two feet that are sized and shaped to provide stability to the removable ember tray 230, while other embodiments include four or more feet. The size and shape of the central hub 420, radial reinforcement arms 430, and feet 440 may be any of a variety of sizes and shapes. Figure 4 Some embodiments may have a different number of feet 440 or reinforcement arms 430 than shown in , or may lack hubs 420 and / or reinforcement arms 430 entirely.

[0054] When properly arranged in the exemplary firepit 150, the ember tray 230 rests on the bottom 220 of the support tray 475. The support tray bottom 475 includes a raised outer ring 460 and a lowered inner ring 470 separated by a centering edge 480. The support tray bottom 475 also includes vents 490 through which air can flow during the ignition of the fuel in the modular firepit 150. The feet 440 of the ember tray 230 rest on the support tray bottom 475 so that they nest on the centering edge 480. This allows the ember tray 230 to be self-centering within the modular firepit 150 and maintains an air gap between the ember tray 230 and the support tray 220, thereby minimizing the amount of work or precision required by the user.

[0055] In one example, the diameter D3 of the ember tray is smaller than the diameter D1 of the grate 100 (and therefore smaller than the inner diameter of the inner wall 140) by an amount that is large enough to accommodate a user's fingers. The lip 410 or sidewall 402 may form one or more grippable surfaces that enable a user to grasp the ember tray 230 and lift it vertically upward through the incineration chamber 190 of the modular firebox 150, or to lower it vertically through the incineration chamber 190 to return it to the modular firebox 150.

[0056] In one example, because the central hub 420 and radial reinforcement arms 430 increase the strength and rigidity of the removable ember tray 230, the overall thickness (and therefore weight) of the ash tray can be reduced without significantly increasing the risk of heat-related warping or denting or other damage from handling the ash tray 230. In one example, the removable ember tray 230 can be quickly and cost-effectively produced from stamped metal blanks.

[0057] Figure 5 1 is a side view of an exemplary modular fire pit 150 according to at least one embodiment of the present disclosure. Visible are the flame ring 130, the outer wall or body 120, the fireplace opening 180, the gasket 185, the air intake holes 122, and the base 110. The fireplace mantel 170 is located at the bottom of the fireplace opening 180 and includes a top surface 176, a side surface 174, and a bottom surface 172. In some embodiments, it may be possible or desirable to place an object on the top surface 176 to be heated by the fire. For example, a cup of coffee or hot chocolate may be kept warm, a pair of damp socks may be dried, and so on.

[0058] The modular firebox is adapted to an overall width (in this case, diameter Dc) and height Hc. In one example, the width Dc is between 6 inches and 42 inches, and the Hc is between 8 inches and 7 feet, but smaller and larger widths and heights are contemplated. For example, certain embodiments have a width range of 6 inches and 26 inches, and a height range of 11 inches and 5 feet. However, other widths and heights are also contemplated.

[0059] Figure 6 1 is a side cross-sectional view of an exemplary modular fire pit 150 according to at least one embodiment of the present disclosure. Visible are the flame ring 130, top ring 135, outer wall or body 120, inner wall or body 140, deflector 210, chimney 165, fireplace opening 180, gasket 185, air outlet aperture 124, mantel 170 (including upper surface 176 and lower surface 172), removable fuel grate 100, support tray 220, removable ash tray 230, air inlet aperture 122, and base 110. Figure 6As shown, the deflector 210 narrows the passage of air through the chimney. This narrow area can increase the flow velocity through the deflector 210, thereby increasing the suction of any remaining smoke out of the fireplace opening 180 and up the chimney. This can also help reduce the likelihood of flames emerging from the fireplace opening 180. In some examples, the inner holes are arranged only on the inner circumference, rather than directly below the fireplace opening 180, to help with this flow.

[0060] Figure 7 1 is a front cross-sectional view of an exemplary modular firebox 150 according to at least one embodiment of the present disclosure. Visible are the flame ring 130, top ring 135, outer wall or body 120, inner wall or body 140, chimney 165, air outlet aperture 124, removable fuel grate 100, support tray 220, removable ash tray 230, air inlet aperture 122, and base 110.

[0061] Figure 6 and Figure 7 Arrows 177 in the figure represent reflected infrared (IR) radiant energy (i.e., heat) radiated from the fireplace opening 180. The double wall system of the inner wall 140 and the outer wall 120 provides a degree of thermal insulation that keeps the outer surface of the outer wall 120 at a relatively low temperature compared to the surface of the inner wall 140 of the stove, while the fireplace opening 180 can be heated from the rear wall surface 181 ( Figure 2 ) emits reflected infrared radiant energy. In some embodiments, the fireplace opening 180 can emit both reflected radiant heat from the rear wall surface and radiant heat or convection heat from the flame and / or fuel in the combustion chamber. In certain embodiments, this radiant heat can include heat generated by flames formed by: a) secondary combustion or secondary incineration of the air outlet holes, b) primary combustion or primary incineration of the main fuel due to the primary airflow through the fuel grate, or c) primary and secondary incineration together. Convection heat can also be emitted from the top of the chimney along with any additional radiant heat from the inner wall 140.

[0062] In some embodiments, the deflector 210 can also reflect radiant heat (indicated by arrows 179) into the reflective rear wall 181, which in turn can reflect the radiant heat 177 into the fireplace opening 180. In some embodiments, the deflector 210 can be formed of a reflective material of the type discussed herein with respect to the rear wall 181, or have a reflective coating as discussed herein with respect to the rear wall 181, but the surface finish or infrared reflectivity can vary between the rear wall 181 and the deflector 210.

[0063] Figure 81 is a front cross-sectional view of at least a portion of an exemplary modular firebox 150 according to at least one embodiment of the present disclosure. Visible are the outer wall or body 120, the inner wall or body 140, the chimney 165, the air outlet aperture 124, the removable fuel grate 100, the support tray 220, the removable ash tray 230, the air inlet aperture 122, and the base 110. The support tray 220 is attached to the inner wall or body 140 and forms the bottom thereof.

[0064] exist Figure 8 In the example shown, there is a first air gap 810 between the bottom 125 of the outer body 120 and the bottom 475 of the support tray 220. There is a second air gap 820 between the support tray 220 and the removable ember tray 230. There is a third air gap 830 between the removable ember tray 230 and the removable fuel grate 100. There is a fourth air gap 840 between the outer wall or body 120 and the inner wall or body 140. These air gaps have both an insulating and cooling function, thereby keeping the outer surface cool, and an oxygen circulation function to promote primary and secondary incineration.

[0065] The modular stove 150 is designed to provide airflow patterns that are favorable for primary and secondary combustion. External cold air 850 enters the air gap 810 between the bottom 125 of the outer body 120 and the bottom 475 of the support tray 220 through the lower vents or air inlet holes 122. There, the air is divided into two separate flows: an upward flow 860 and a radial flow 870.

[0066] In radial flow 870, cool air enters vents 490 in bottom 475 of support tray 220 (see Figure 4 ), then flows radially outward through the air gap 820 between the support tray 220 and the removable ember tray 230, then upward to the air gap 830 between the removable ember tray 230 and the removable fuel grate 100, where it is heated. From there, the air passes vertically through the fuel grate 100. The introduction of hot fresh (e.g., oxygen-containing) air into the combustion chamber supports the flame or primary combustion 890 of the fuel 880.

[0067] In the upward flow 860, the cool air enters the air gap 840 between the outer wall 120 and the inner wall 140, where it is heated and then radially inward through the upper vents or air outlet holes 124. The introduction of hot fresh (e.g., oxygen-containing) air into the combustion chamber 190 above the fuel 880 and the primary combustion flame 890 produces a secondary combustion 895 of the unburned smoke, gases, and ash emitted by the burning fuel 880. This secondary combustion 895 increases the overall energy output (e.g., heat and light) of the fuel 880 while reducing the amount of smoke, ash, and organic gases emitted by the modular stove 150. In one example, a certain proportion of the smoke, ash, and organic matter is converted into ash 898, carbon dioxide, nitrogen, and water vapor instead of being emitted from the modular stove 150 in its original form.

[0068] Embers 898 fall from the opening of the removable fuel grate and are collected in the removable ember tray 898. When the fire is cool, the ember tray can be emptied by reaching into the fireplace opening and removing the fuel grate 100 through the fireplace opening (e.g., by its handle). Depending on the implementation, the fuel grate 100 can be removed through the fireplace opening in a horizontal direction. In other embodiments, the fuel grate 100 can be removed through the fireplace opening in a diagonal direction (e.g., aligned with the corner of the fireplace opening). Once the fuel grate 100 is removed, the ember tray 230 can also be removed through the fireplace opening. Once the ember tray 230 is emptied, it can be replaced into the incineration chamber 190 through the fireplace opening, and the fuel grate 100 can be replaced into the incineration chamber 190 and positioned on top of the ember tray 230.

[0069] Depending on the implementation, the size or shape of air gaps 810 , 820 , 830 , and 840 may vary from the examples shown herein while still achieving the functionality described herein.

[0070] In some embodiments, the lower vents 122 are arranged on the side of the base or support 110. Therefore, the airflow will start from a lower position and flow upward through the support tray described herein. In some embodiments, the upper vents 124 are arranged above the front opening or fireplace opening 180 instead of below. In such an embodiment, the airflow may include air drawn inward through the front opening or fireplace opening 180, which is mixed with a portion of the air from the upper vents 124. In some embodiments, the stove includes multiple levels of internal vents. For example, some internal vents 124 can be arranged below the fireplace opening 180 as shown, while other internal vents can be arranged at different heights, such as above the fireplace opening 180. In some embodiments, the number of internal vents or the combined area of ​​the internal vents is at a higher position, which can be larger for the lower internal vents and smaller for the internal vents. However, other configurations can also be considered.

[0071] As those of ordinary skill in the art will readily appreciate after becoming familiar with the teachings herein, modular fire pits advantageously provide a unique outdoor experience while amplifying the amount of light and heat and minimizing the amount of smoke and / or ash released from burning fuel.

[0072] There can be many variations on the examples and embodiments described above. For example, a modular fire can be taller, shorter, wider, or narrower than described herein. It can have more or fewer components while still performing the functions described herein. It can be made in different shapes. For example, although the modular fire described herein is circular in cross-section, it can be square, rectangular, triangular, oval, polygonal, etc. Any of the components described herein can be metal (e.g., stamped or rolled stainless steel) or made of other materials (including but not limited to polymers, ceramics, composites, or other materials).

[0073] Therefore, the segments and / or logical operations constituting the technical embodiments described herein are variously referred to as operations, steps, objects, elements, components or modules. In addition, it should be understood that these may occur, or be executed or arranged in any order, unless the declarative language itself requires otherwise explicit declaration or a specific order.

[0074] All directional references, such as up, down, inside, outside, upward, downward, left, right, lateral, front, back, top, bottom, above, below, vertical, horizontal, clockwise, counterclockwise, proximal and distal are used for identification purposes only to assist the reader in understanding the claimed subject matter and do not constitute limitations with respect to the location, orientation or use of the modular stove in particular. Connection references, such as attached, coupled, connected, joined or "in communication with..." should be interpreted broadly and may include intermediate members between a set of elements and relative movement between elements, unless otherwise specified. Therefore, connection references do not necessarily mean that two elements are fixedly connected directly to each other. The term "or" should be interpreted as "and / or", not "exclusive or". The word "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Unless otherwise specified in the claims, the values ​​stated should be interpreted as illustrative values ​​only and should not be regarded as limiting values.

[0075] The above specification, examples, and data provide a complete description of the structure and use of exemplary embodiments of modular fires as defined in the claims. Although various embodiments of the claimed subject matter have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous modifications to the disclosed embodiments without departing from the spirit or scope of the claimed subject matter.

[0076] Other embodiments are also contemplated. It is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative only of particular embodiments and not limiting. Changes in detail or structure may be made without departing from the essential elements of the subject matter defined in the following claims.

Claims

1. A portable fireplace for burning combustible fuel, the portable fireplace comprising: an outer wall defining a lower portion and a tower portion; an inner wall separated from the outer wall by an air gap and defining a combustion chamber in the lower portion and a chimney in the tower portion; a fireplace opening extending through the outer wall and the inner wall; a plurality of air intake apertures configured to draw air from an environment outside the portable fireplace; and A plurality of air outlet holes are connected with the air inlet holes and the air gap, and the plurality of air outlet holes are arranged on the inner wall of the incineration chamber below the opening. 2 . The portable fireplace according to claim 1 , further comprising a base that is different from the outer wall, the base being arranged at the bottom of the outer wall.

3. The portable fireplace of claim 1, further comprising a draft guide disposed within the chimney above the fireplace opening.

4. The portable fireplace of claim 1, further comprising a removable fuel grate disposed within the combustion chamber.

5. The portable fireplace of claim 4, further comprising a removable ember tray disposed below the removable fuel grate.

6. The portable fireplace of claim 4, wherein the inner wall, outer wall, air gap, removable ash tray, and removable fuel grate are configured such that air entering through the plurality of air inlet apertures is exhausted through both the plurality of air outlet apertures and the plurality of vents in the removable fuel grate.

7. The portable fireplace of claim 6, wherein air exhausted through the plurality of vents in the removable fuel grate assists in primary combustion of fuel disposed on the removable fuel grate.

8. The portable fireplace according to claim 7, wherein the air exhausted through the plurality of air outlet holes supports secondary combustion of gas, smoke or ash emitted by the fuel.

9. The portable fireplace of claim 1, further comprising a fireplace mantel disposed below the fireplace opening and projecting outwardly from the outer wall.

10. A method for burning a combustible fuel, the method comprising: A structure is provided, comprising: an outer wall defining a lower portion and a tower portion; an inner wall separated from the outer wall by an air gap and defining a combustion chamber in the lower portion and a chimney in the tower portion; a fireplace opening extending through the outer wall and the inner wall; a fireplace mantel disposed below the fireplace opening and projecting outwardly from the outer wall; a plurality of air inlet through holes arranged in the lower portion of the outer wall; drawing air through the plurality of air inlet holes; discharging a first portion of air into a lower portion of the combustion chamber to support primary combustion of the fuel; and A second portion of air is discharged into the upper portion of the combustion chamber to support secondary combustion of gases, smoke or soot emitted during the primary combustion of the fuel.

11. The method of claim 10, further comprising providing a base distinct from the outer wall and positioning a bottom portion of the outer wall on top of the base.

12. The method of claim 10, further comprising directing the radiant heat with a deflector within the chimney above the fireplace opening.

13. The method of claim 10, further comprising supporting the fuel on a removable fuel grate disposed within the incineration chamber.

14. The method of claim 13, further comprising collecting primary and secondary incineration ash into a removable ash pan disposed within the incineration chamber below the removable fuel grate.

15. The method of claim 14, wherein the removable fuel grate and the removable ember tray are each removable from the combustion chamber via the fireplace opening.

16. A system for burning a combustible fuel to provide light and heat, the system comprising: a double-walled body defining a lower portion and a tower portion; an incineration chamber disposed within the lower portion; a chimney disposed within the tower portion; an air gap disposed between the walls of the double-walled body; a fireplace opening disposed within the tower; a fireplace mantel disposed below the fireplace opening and projecting outwardly from the double-walled body; a plurality of air inlet holes arranged on an outer surface of the lower portion; A plurality of air outlet holes are arranged on the inner surface of the incineration chamber; a base, which is different from the double-walled body, and the base is arranged at the bottom of the double-walled body; a deflector disposed in the chimney above the fireplace opening; a removable fuel grate disposed within the combustion chamber; and A removable ash tray is disposed beneath the removable fuel grate.

17. The system of claim 16, wherein the double wall, air gap, removable ash tray, and removable fuel grate are configured such that air entering through the plurality of air inlet apertures is exhausted through both the plurality of air outlet apertures and the plurality of vents in the removable fuel grate, wherein air exhausted through the plurality of ventilation holes in the removable fuel grate assists in primary combustion of fuel disposed on the removable fuel grate, and The air discharged through the plurality of air outlet holes supports the secondary combustion of the gas, smoke or soot emitted by the fuel.

18. A portable fireplace for burning a combustible fuel, the portable fireplace comprising: The lower part comprises: outer wall; and an inner wall separated from the outer wall by an air gap and defining an incineration chamber; a fuel grate configured to support fuel and define a portion of the combustion chamber; a chimney arranged above the lower portion, the chimney being arranged to extract smoke from the incineration chamber therethrough; a fireplace opening in one of the lower portion and the chimney, the fireplace opening being arranged at a height above the fuel grate and providing visual lateral access to the interior of the combustion chamber; an air intake vent in one of the lower portion and the chimney, the air intake vent being configured to draw air from outside the portable fireplace into an air gap between the outer wall and the inner wall; a first air outlet hole configured to introduce the sucked air at a height below the fuel grate to supply the flame of the fuel on the fuel grate and cause primary combustion of the fuel; and A second air outlet hole is arranged on the inner wall and is used to introduce air into the combustion chamber at a height above the fuel grate to assist the secondary combustion of the fuel. The second air outlet hole is fluidly connected to the air gap between the outer wall and the inner wall and the air inlet hole, and is configured to provide air through the channel of the chimney.

19. The portable fireplace of claim 18, wherein the first air outlet aperture is in fluid communication with the air inlet aperture.

20. The portable fireplace of claim 18, further comprising a base forming a portion of the lower portion, the air inlet through hole being arranged on an outer surface of at least one of the outer wall and the base.

21. The portable fireplace of claim 18, further comprising a second air inlet through hole, the second air inlet through hole being in fluid communication with the first air outlet through hole.

22. The portable fireplace of claim 18, wherein the second air outlet hole is arranged at a height lower than the fireplace opening.

23. The portable fireplace of claim 18, wherein the second air outlet hole is arranged at a height higher than the fireplace opening.

24. A portable fireplace for burning a combustible fuel, the portable fireplace comprising: outer wall; and an inner wall separated from the outer wall by an air gap and defining an incineration chamber; a fuel grate configured to support fuel and define a portion of the combustion chamber; a fireplace opening passing through the inner wall and the outer wall, the fireplace opening being arranged at a height above the fuel grate and providing visual lateral access to the interior of the incineration chamber; an open top configured to transfer convective heat as fuel burns on the fuel grate; a first air outlet hole configured to introduce air into the combustion chamber at a height below the fuel grate to supply the flame of the fuel on the fuel grate and cause primary combustion of the fuel; and A second air outlet through hole is arranged at a height above the fuel grate to help secondary combustion of the fuel, and the second air outlet through hole is in fluid communication with the air gap between the outer wall and the inner wall.

25. The portable fireplace of claim 24, further comprising an air intake aperture in fluid communication with at least one of the first air outlet aperture and the second air outlet aperture to draw air for combustion of fuel on the fuel grate.

26. The portable fireplace of claim 24, wherein the interior wall includes an infrared reflective surface opposite the fireplace opening, the infrared reflective surface configured to reflect radiant energy out of the fireplace opening.

27. The portable fireplace of claim 26, further comprising a reflective redirector facing an infrared reflective surface opposite the fireplace opening, the reflective redirector being configured to reflect radiant energy toward the infrared reflective surface opposite the fireplace opening.

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