EP3358254A1 - Liquid fuel burner - Google Patents
Liquid fuel burner Download PDFInfo
- Publication number
- EP3358254A1 EP3358254A1 EP18155112.8A EP18155112A EP3358254A1 EP 3358254 A1 EP3358254 A1 EP 3358254A1 EP 18155112 A EP18155112 A EP 18155112A EP 3358254 A1 EP3358254 A1 EP 3358254A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid fuel
- cartridge
- burner
- cartridge body
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C5/00—Stoves or ranges for liquid fuels
- F24C5/18—Liquid-fuel supply arrangements forming parts of stoves or ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D3/00—Burners using capillary action
- F23D3/02—Wick burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/147—Valves
Definitions
- the present invention relates to a liquid fuel burner configured to burn a liquid fuel fed from a liquid fuel tank using a burner.
- liquid fuel In a conventional liquid fuel burner, commercially available liquid fuel is poured into a metallic cartridge tank. Then, the liquid fuel is fed from the cartridge tank to a liquid fuel tank, and the liquid fuel is burnt with a burner.
- liquid fuel burners are commercially available. If a liquid fuel cartridge cannot be used in the commercially available liquid fuel burners, popularization of the liquid fuel cartridge pre-filled with liquid fuel cannot be expected.
- the liquid fuel cartridge made of a resin may be deformed. Even if such deformation is not a problem in view of safety, a user may feel uneasy in using such deformed cartridge, thereby hindering popularization of the liquid fuel cartridge made of a resin.
- An aim of the present invention is to provide a liquid fuel burner provided with a liquid fuel cartridge made of a resin that is not deformed due to the effect of heat from the burner when the cartridge is received in a cartridge chamber of the burner.
- Another aim of the present invention is to provide a liquid fuel burner that allows a worker to easily replace the liquid fuel cartridge.
- a liquid fuel burner of the present invention includes a liquid fuel cartridge, a liquid fuel tank, a burner assembly, a frame structure including a heat insulating plate that partitions a cartridge chamber and a burner assembly chamber, and a lid that blocks an upper opening of the cartridge chamber.
- the liquid fuel cartridge includes a cartridge body having a fuel discharge port and a valve assembly mounted to the fuel discharge port of the cartridge body.
- the liquid fuel tank has a fuel feed port and is provided with an attachment to be fitted with a part of the valve assembly.
- the burner assembly is operable to burn a liquid fuel fed from the liquid fuel tank.
- the frame structure receives the liquid fuel tank and includes the heat insulating plate.
- the frame structure has therein the cartridge chamber to receive the liquid fuel cartridge and the burner assembly chamber to receive the burner assembly.
- the cartridge body is made of a resin molded product.
- the cartridge body is constituted from a bottom portion opposed to the lid of the burner, a main body portion continuous with the bottom portion, and a central portion continuous with the main body portion.
- An outer dimension of the main body portion is designed to be smaller than an outer dimension of the central portion such that a gap (S1) is defined between the heat insulating plate and the main body portion so as to suppress the temperature of the main body portion below the starting temperature of thermal deformation.
- a top plate of the frame structure and a portion of the heat insulating plate in the vicinity of the top plate are heated to a fairly or quite high temperature by heat scattering upward.
- heat from the heated top plate and the heated portion of the heat insulating plate heats the main body portion of the cartridge body.
- providing a gap (S1) between the heat insulating plate and the main body portion of the cartridge body allows the temperature of the main body portion of the cartridge body to be lower than the starting temperature of thermal deformation. As a result, it is possible to prevent thermal deformation of the main body portion of the cartridge body, and to provide a liquid fuel burner that does not make the user uneasy in using the burner.
- a heat insulating space (S2) is provided between the lid and the bottom portion of the cartridge body so as to prevent the temperature of the bottom portion of the cartridge body from rising due to the heat transferred from the top plate of the frame structure to the lid to exceed the starting temperature of thermal deformation. Thus, prevention of thermal deformation is furthermore ensured.
- the burner assembly is provided with a wick-type burner having a burning capacity of 2000 W or more
- the cartridge body is formed of a polyethylene terephthalate
- the frame structure and the lid are each made of a metal plate
- the gap (S1) is preferably 6 mm or more in thickness
- the heat insulating space (S2) is preferably 40 mm or more in thickness.
- a finger hook recess may be continuously formed in a circumferential direction of the main body portion of the cartridge body to be opened outwardly such that a worker or a person who replaces the liquid fuel cartridge can hook his/her fingers in the recess.
- a hook may be integrally formed with an outer surface of the bottom portion of the cartridge body such that the worker can insert his/her one or more fingers into the hook. Such recess and hook can facilitate replacement of the liquid fuel cartridge.
- FIG. 1 illustrates a liquid fuel burner of an embodiment of the present invention, a part (a front part) of which is cut away.
- a liquid fuel burner 1 includes a liquid fuel cartridge 3, an attachment 5, a liquid fuel tank 7 having a fuel feed port 7A, and a burner assembly 9.
- the burner assembly 9 is operable to burn the liquid fuel (generally, kerosene oil) fed from the liquid fuel tank 7.
- the burner assembly 9 is provided with a wick-type burner having a burning capacity of 2200W.
- the configuration of the burner is the same as that of a commercially available liquid fuel burner, except the liquid fuel cartridge 3 and the attachment 5.
- Using the attachment 5 allows the liquid fuel cartridge 3 to be mounted to various types of commercially available liquid fuel burners.
- an inserting direction ID of the liquid fuel cartridge 3 is defined as a vertically downward direction on the paper of FIG. 1 as indicated with an arrow in FIG. 1 .
- the inserting direction ID is used as a reference when identifying various directions in other figures.
- liquid fuel cartridge 3 Referring to FIGs. 2 to 5 , the liquid fuel cartridge 3 will be described below.
- FIGs. 2A, 2B, 2C, and 2D are a top plan view, a front elevation view, a cross sectional view as taken along line C-C of FIG. 2B , and a vertical cross sectional view as taken along line D-D of FIG. 2A , respectively, each illustrating the liquid fuel cartridge mounted with a cap.
- the liquid fuel cartridge 3 is filled with liquid fuel (e.g. kerosene oil).
- the liquid fuel cartridge 3 filled with the liquid fuel is put on sale and sold to the consumer.
- the liquid fuel cartridge 3 includes a cartridge body 11 made of a resin and having a fuel discharge port 11A, and a valve assembly 13 to be mounted to the fuel discharge port 11A of the cartridge body 11.
- the valve assembly 13 is mounted with a cap 15.
- the cartridge body 11 includes a bottom portion 11B, a main body portion 11C continuous with the bottom portion 11B, and a central portion 11D continuous with the main body portion 11C.
- a finger hook recess 11E is continuously formed to be outwardly opened so as to be engaged with a plurality of fingers of a worker or a person who replaces the liquid fuel cartridge with another one.
- a hook may be formed unitarily with an outer surface of the bottom portion 11B to be engaged with one or more fingers of the worker.
- FIG. 3 through FIGs. 5A to 5C illustrate the valve assembly 13 that is detached from the cartridge body 11.
- FIG. 3 is a perspective view of the valve assembly 13.
- FIG. 4 is a perspective view of the disassembled valve assembly 13.
- FIGs. 5A, 5B, and 5C are a top plan view, a cross sectional view as taken along line B-B of FIG. 5A , and a cross sectional as taken along line C-C of FIG. 5A , respectively.
- the valve assembly 13 includes a valve seat structure 17 made of a resin, a valve element 19 made of a resin, an open/close energizing element 21 formed of a metallic coil spring, and a pressing member 23 made of a resin.
- the material for the open/close energizing element 21 is not limited to metals, but may be made of a resin.
- the valve seat structure 17 includes a bottom wall portion 25 having a through hole 29 formed in a central portion thereof to allow the liquid fuel to pass therethrough, and a peripheral wall portion 27 extending upright from an outer periphery of the bottom wall portion 25.
- An annular flange portion 28 is unitarily formed with an end portion of the peripheral wall portion 27 that is located opposite to the bottom wall portion 25.
- An annular valve seat 31 is formed around the through hole 29 formed in the bottom wall portion 25.
- an outer wall portion 33 of the peripheral wall portion 27 of the valve seat structure 17 four groove portions 35 are formed, and four protruding portions 37 are respectively formed in the four groove portions 35.
- the groove portions 35 are opened in the inserting direction ID and are also opened outwardly in an orthogonal direction orthogonal to the inserting direction ID.
- an outline of an inner circumferential surface 35a of each of the groove portions 35 is triangularly shaped such that the triangular outline has a base on the side of the bottom wall portion 25 and a dimension of the outline as measured in the circumferential direction becomes smaller toward an apex of the triangle.
- the apex constitutes a first opposed portion 35A of the inner circumferential surface 35a of each groove portion 35.
- An outline of an outer circumferential surface 37a of each of the protruding portions 37 is shaped such that the outline has an apex (a leading end) 37A in an opening of the groove portion 35 opened in the inserting direction ID, and a dimension of the outline as measured in the circumferential direction becomes larger in a direction opposite to the inserting direction ID and then becomes smaller in a direction opposite to the inserting direction ID.
- an end surface of the protruding portion 37 that is located in a direction opposite to the inserting direction ID constitutes a second opposed portion 37B of the outer circumferential surface 37a of the protruding portion 37.
- each protruding portion 37 that constitutes the second opposed portion 37B is slightly curved to be convex in the inserting direction ID. In terms of positional relationship, the first opposed portion 35A and the second opposed portion 37B are opposed to each other in the inserting direction ID.
- the inner circumferential surfaces 35a of the groove portions 35 and the outer circumferential surfaces 37a of the protruding portions 37 are shaped such that in a process in which the valve seat structure 17 is inserted into a recessed portion 67 of the attachment 5 which will be described later in detail, engagement projecting portions 73 of the attachment 5 are respectively guided into the groove portions 35 along the inner circumferential surfaces 35a of the groove portions 35 or the outer circumferential surfaces 37a of the protruding portions 37, and that when the valve seat structure 17 is further inserted into the recessed portion 67, the engagement projecting portions 73 are respectively guided such that each of the engagement projecting portions 73 is situated between the first opposed portion 35A of the inner circumferential surface 35a of the groove portion 35 and the second opposed portion 37B of the outer circumferential surface 37a of the protruding portion 37, the first and second opposed portions 35A and 37B being opposed to each other in the inserting direction ID.
- the leading portion 36A, which is located in the inserting direction ID, of a wall portion 36 located between two adjacent groove portions 35 and the leading portion 37A of each protruding portion 37, which is located in the inserting direction ID, are shaped such that the respective dimensions as measured in the circumferential direction gradually become smaller in the inserting direction.
- partial male screw portions 36B and 37C are formed to be screwed with the cap 15.
- two cap engaging portions 38 are formed in the vicinity of the flange portion 28 of the outer wall portion 33 of the valve seat structure 17 so as to be engaged with the cap 15.
- the two cap engaging portions 38 are disposed 180 apart from each other in the circumferential direction.
- the cap engaging portions 38 each include an inclined portion 38A that gradually becomes more distant from the outer wall portion 33 in the orthogonal direction along the circumference and a flat portion 38B continuous with the inclined portion 38A.
- the valve seat structure 17 is formed by injection molding.
- the parting line PL of a mold to be used in injection molding passes through the leading portion 36A of the wall portion 36 as illustrated in FIG. 3 .
- a plurality of thinned portions 33A are formed to prevent sinks.
- a pressing member engaged portion 34A to be fixedly engaged with the pressing member 23 and a cartridge body engaged portion 34B to be engaged with the fuel discharge port 11A of the cartridge body 11 are formed inside the peripheral wall portion 27 (specifically, an inner wall portion 34) of the valve seat structure 17.
- the valve element 19 includes a valve body portion 39, a valve member 41 disposed at a location opposed to the valve seat 31 and co-operative with the valve seat 31, a plurality of protrusions 43 (in this embodiment, eight protrusions) formed in an outer wall of the valve body portion 39, and an axial portion 45 extending from a central portion of the valve body portion 39 in the inserting direction ID.
- the liquid fuel passes through a valley portion 44 defined between two adjacent protrusions 43.
- the open/close energizing element 21 passes through the axial portion 45, with one end 21A of the open/close energizing element 21 abutting on the valve body portion 39 and the other end 21B abutting on the pressing member 23.
- the open/close energizing element 21 is operable to generate a pressing force that acts to press the valve member 41 onto the valve seat 31 when the open/close energizing element 21 is released.
- the pressing member 23 includes an open/close energizing element receiving portion 47 that receives the open/close energizing element 21, an annular valve seat structure engaging portion 49 formed around an open/close energizing element receiving portion 47, an axial through hole 51 formed on an apex of the open/close energizing receiving portion 47, through which the axial portion 45 passes, and a fuel passage 53 formed around the open/close energizing element receiving portion 47 to allow the liquid fuel to pass therethrough.
- the valve seat structure engaging portion 49 is engaged with the pressing member engaged portion 34A formed in the inner wall portion of the valve seat structure 17 [see FIG. 5C ] and then comes into fixed engagement with the valve seat structure 17.
- the other end 21B abuts on the periphery of the axial through hole 51.
- FIG. 6 is a perspective view of the cap 15, as viewed from below the cap 15, to be mounted to the valve assembly illustrated in FIGs. 3 , 4 , and 5A to 5C .
- a female screw portion 55 to be screwed with the partial male portions 36B and 37C illustrated in FIG. 3 , and two engaged portions 57 to be engaged with a cap engaging portion 38 illustrated in FIG. 5A are formed in an inner peripheral surface of the cap 15. The two engaged portions 57 are disposed 180° apart in the circumferential direction.
- the engaged portions 57 each include an inclined surface 57A that gradually becomes more distant radially inward from the inner peripheral surface of the cap 15 along the circumference in a direction opposite to a turning direction for mounting the cap 15, and a flat surface 57B extending from the terminal position of the inclined surface 57A, radially toward the inner peripheral surface.
- Two index portions 59 that indicate a finger pressing position are formed in an outer peripheral surface of the cap 15.
- the two index portions 59 are shifted from the two engaged portions 57 by 90° in the circumferential direction.
- the two index portions 59 are disposed apart from each other by 180° in the circumferential direction.
- the cap 15 is fitted with the valve assembly 13 and the cap 15 is turned until the cap engaging portion 38 abuts on the engaged portions 57 with the partial male screw portions 36B and 37C being screwed into the female screw portion 55. Then, the cap 15 is further turned with respect to the valve assembly 13. The engaged portions 57 climb on the inclined surfaces 38A of the cap engaging portions 38, slide on the flat surfaces 38B, and finally climb over the cap engaging portions 38. Thus, the liquid fuel cartridge will not be detached by turning the cap 15 in an opposite direction to the direction for tightening the liquid fuel cartridge since the engaged portions 57 are engaged with the cap engaging portions 38. Thus, this works as a so-called child safety lock that prevents a child from inadvertently opening the liquid fuel cartridge 3 [see FIGS.
- the child safety lock should be released by tightly gripping the cap 15 with fingers at the two index portions 59 to deform the cap 15, thereby widening the distance between the engaged portions 57, and while maintaining this state, turning the cap 15 with respect to the valve assembly 13 in the opposite direction to the direction for closing the cap. This causes the engaged portions 57 to climb over the cap engaging portions 38, thereby releasing the child safely lock.
- FIG. 7 is a perspective view of the attachment.
- FIG. 8 is a perspective view of the disassembled attachment.
- the attachment 5 is mounted to the fuel feed port 7A of the liquid fuel tank 7.
- the attachment 5 includes an attachment body portion 61, a pushup energizing element 63, and a partition plate 65.
- the attachment body portion 61 includes a recessed portion 67 to be engaged with the valve seat structure 17, a pushup pin 69 provided in the recessed portion 67 and configured to push up the valve element 19 with the valve seat structure 17 being fitted in the recessed portion 67, and four fuel discharge holes 71 formed in the recessed portion 67 and configured to allow the liquid fuel, which has been discharged from the liquid fuel cartridge into the recessed portion 67, to pass therethrough.
- a plurality of engagement projecting portions 73 are provided on an inner wall portion of the recessed portion 67 to project inwardly of the recessed portion 67 and arranged at a predetermined pitch in the circumferential direction of the recess portion 67.
- the engagement projecting portions 73 are each shaped such that a dimension, as measured in the circumferential direction, of a leading portion 73A extending in a pull-out direction opposite to the inserting direction ID gradually becomes smaller in the pull-out direction.
- the pushup energizing element 63 is provided around the pushup pin 69.
- the partition plate 65 is an annular member having a through hole 75 formed in a central portion thereof, and is supported by the pushup energizing element 63.
- the partition plate 65 is supported by the pushup energizing element 63 and the four engagement projecting portions 73, and is configured not to be positioned above the four engagement projecting portions 73.
- the bottom wall portion 25 of the valve seat structure 17 of the valve assembly 13 abuts on the partition plate 65.
- four projections 77 are formed on the surface of the partition plate 65.
- FIGs. 9A and 9B to Figs. 12A and 12B illustrate that the liquid fuel cartridge is to be engaged with the attachment.
- FIGs. 9A , 10A , 11A , and 12A are cross sectional views of the liquid fuel cartridge 3 and the attachment 5.
- FIGs. 9B , 10B , 11B , and 12B schematically illustrate the engagement process of the groove portions 35 and protruding portions 37 formed in the outer wall portion 33 of the valve seat structure 17 with the engagement projecting portions 73 provided on the inner wall portion of the attachment 5.
- the side where the valve assembly 13 of the liquid fuel cartridge 3 is located is caused to face the recessed portion 67 of the attachment 5 and then the liquid fuel cartridge 3 is inserted into the recessed portion 67 of the attachment 5 [see FIGs. 9A and 9B ].
- the engagement projecting portions 73 are positioned outside the groove portions 35 as illustrated in FIG. 9B .
- the liquid fuel cartridge 3 is turned (regardless of the turning direction) around an imaginary centerline IL of the axial portion 45 of the valve element 19.
- the engagement projecting portions 73 are guided along the inner circumferential surfaces 35a of the groove portions 35 or the outer circumferential surfaces 37a of the protruding portions 37 into the groove portions 35 [see FIGs. 10A and 10B ] since the leading portions 36A and 37A, and the leading portions 73A of the engagement projecting portions 73 each have a small contact area. From this point, the liquid fuel cartridge 3 is further pressed in the inserting direction ID. The engagement projecting portions 73 are guided along the inner circumferential surfaces 35a of the groove portions 35 and reach the first opposed surface portion 35A [see FIGs. 11A and 11B ] . In FIGs.
- the open/close energizing element 21 is energized since the valve element 19 is pushed up by the pushup pin 69, and the pushup energizing element 63 is energized since the valve seat structure 17 pushes down the partition plate 65.
- the open/close energizing element 21 and the pushup energizing element 63 co-operatively work as the energizing means.
- releasing the pressing force to press the liquid fuel cartridge 3 in the inserting direction ID releases the open/close energizing element 21 and pushup energizing element 63 to cause the liquid fuel cartridge 3 to move in the pull-out direction.
- the liquid fuel cartridge 3 is turned to cause the engagement projecting portions 73 to be guided along the inner circumferential surfaces 35a of the groove portions 35 and slide out to release the engagement [the disengagement process follows FIGs. 12A and 12B , FIGs. 11A and 11B , FIGs. 10A and 10B , and FIGs. 9A and 9B in this order].
- the liquid fuel burner 1 includes a frame structure 81 and a lid 83 as illustrated in FIG. 1 .
- the frame structure 81 includes a cartridge chamber 85 to receive the liquid fuel cartridge 3 and a burner assembly chamber 87 to receive the burner assembly 9.
- a heat insulating plate 89 is provided between the cartridge chamber 85 and the burner assembly chamber 87.
- the frame structure 81 and the heat insulating plate 89 are made of a metal plate.
- the lid 83 blocks an upper opening of the cartridge chamber 85 and is opposed to a bottom portion 11B of the cartridge body 11 with the liquid fuel cartridge 3 being received in the cartridge chamber 85.
- a top plate of the frame structure 81 and a portion of the heat insulating plate 89 in the vicinity of the top plate are heated to a fairly or quite high temperature by heat scattering upward, and in turn the heat from the heated top plate and the heated portion of the heat insulating plate 89 heats the cartridge main portion 11C of the cartridge body 11.
- the temperature of the cartridge main portion 11C of the cartridge body 11 is designed to be lower than the temperature of starting thermal deformation while increasing the volume of the cartridge body 11 by devising the dimension and shape of the cartridge body 11. Namely, as illustrated in FIG. 1 and FIGs.
- the outside dimension of the cartridge main portion 11C is designed to be smaller than the outside dimension of a central portion 11D of the cartridge body 11, and a gap S1 is provided between the heat insulating plate 89 and the cartridge main portion 11C. Further, a heat insulating space S2 is provided between the cartridge body 11 and the bottom portion 11B.
- FIG. 13 illustrates an end surface of the liquid fuel burner as cross sectioned along line XIII-XIII of FIG. 1 , and shows only necessary part of the cartridge body 11, the frame structure 81, and the heat insulating plate 89.
- the outside dimension of the central portion 11D of the cartridge body 11 is set to 86 mm, and that of the cartridge main portion 11C is set to 80 mm.
- the thickness of the gap S1 is set to 6.64 mm and that of the heat insulating space S2 is set to 50.7 mm.
- the pushup energizing element 63 is provided in the recessed portion 67 of the attachment 5, and is co-operative with the open/close energizing element 21 to work as the energizing means.
- the pushup energizing element is optionally provided.
- the open/close energizing element 21 may also work as the energizing means without providing the pushup energizing element 63.
- liquid fuel burner provided with a liquid fuel cartridge made of a resin, not a metal, which is not deformed due to the effect of heat of the burner when the liquid fuel cartridge is received in the cartridge chamber. Further, in this liquid fuel burner, replacement of the liquid fuel burner is easy.
Abstract
Description
- The present invention relates to a liquid fuel burner configured to burn a liquid fuel fed from a liquid fuel tank using a burner.
- In a conventional liquid fuel burner, commercially available liquid fuel is poured into a metallic cartridge tank. Then, the liquid fuel is fed from the cartridge tank to a liquid fuel tank, and the liquid fuel is burnt with a burner.
- To save the troublesome labor of pouring the liquid fuel into the cartridge tank, it has been taken into consideration to use a disposable cartridge pre-filled with liquid fuel.
- Various types of liquid fuel burners are commercially available. If a liquid fuel cartridge cannot be used in the commercially available liquid fuel burners, popularization of the liquid fuel cartridge pre-filled with liquid fuel cannot be expected.
- If the liquid fuel cartridge made of a resin is used, the liquid fuel cartridge made of a resin may be deformed. Even if such deformation is not a problem in view of safety, a user may feel uneasy in using such deformed cartridge, thereby hindering popularization of the liquid fuel cartridge made of a resin.
- An aim of the present invention is to provide a liquid fuel burner provided with a liquid fuel cartridge made of a resin that is not deformed due to the effect of heat from the burner when the cartridge is received in a cartridge chamber of the burner.
- Another aim of the present invention is to provide a liquid fuel burner that allows a worker to easily replace the liquid fuel cartridge.
- A liquid fuel burner of the present invention includes a liquid fuel cartridge, a liquid fuel tank, a burner assembly, a frame structure including a heat insulating plate that partitions a cartridge chamber and a burner assembly chamber, and a lid that blocks an upper opening of the cartridge chamber.
- The liquid fuel cartridge includes a cartridge body having a fuel discharge port and a valve assembly mounted to the fuel discharge port of the cartridge body.
- The liquid fuel tank has a fuel feed port and is provided with an attachment to be fitted with a part of the valve assembly.
- The burner assembly is operable to burn a liquid fuel fed from the liquid fuel tank.
- The frame structure receives the liquid fuel tank and includes the heat insulating plate. The frame structure has therein the cartridge chamber to receive the liquid fuel cartridge and the burner assembly chamber to receive the burner assembly.
- Especially in the present invention, the cartridge body is made of a resin molded product. The cartridge body is constituted from a bottom portion opposed to the lid of the burner, a main body portion continuous with the bottom portion, and a central portion continuous with the main body portion. An outer dimension of the main body portion is designed to be smaller than an outer dimension of the central portion such that a gap (S1) is defined between the heat insulating plate and the main body portion so as to suppress the temperature of the main body portion below the starting temperature of thermal deformation.
- Heat from the burner assembly scatters around the burner assembly. A top plate of the frame structure and a portion of the heat insulating plate in the vicinity of the top plate are heated to a fairly or quite high temperature by heat scattering upward. Then, in turn, heat from the heated top plate and the heated portion of the heat insulating plate heats the main body portion of the cartridge body. In the present invention, providing a gap (S1) between the heat insulating plate and the main body portion of the cartridge body allows the temperature of the main body portion of the cartridge body to be lower than the starting temperature of thermal deformation. As a result, it is possible to prevent thermal deformation of the main body portion of the cartridge body, and to provide a liquid fuel burner that does not make the user uneasy in using the burner.
- Heat of the frame structure is transferred to the lid. Then, a heat insulating space (S2) is provided between the lid and the bottom portion of the cartridge body so as to prevent the temperature of the bottom portion of the cartridge body from rising due to the heat transferred from the top plate of the frame structure to the lid to exceed the starting temperature of thermal deformation. Thus, prevention of thermal deformation is furthermore ensured.
- Specifically, if the burner assembly is provided with a wick-type burner having a burning capacity of 2000 W or more, the cartridge body is formed of a polyethylene terephthalate, and the frame structure and the lid are each made of a metal plate, the gap (S1) is preferably 6 mm or more in thickness and the heat insulating space (S2) is preferably 40 mm or more in thickness.
- A finger hook recess may be continuously formed in a circumferential direction of the main body portion of the cartridge body to be opened outwardly such that a worker or a person who replaces the liquid fuel cartridge can hook his/her fingers in the recess. A hook may be integrally formed with an outer surface of the bottom portion of the cartridge body such that the worker can insert his/her one or more fingers into the hook. Such recess and hook can facilitate replacement of the liquid fuel cartridge.
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FIG. 1 illustrates a liquid fuel burner, a part (a front part) of which is cut away, according to an embodiment of the present invention. -
FIG. 2 generically illustrates a liquid fuel cartridge mounted with a cap, assuming that the cartridge is for sale; andFIGs. 2A, 2B, 2C, and 2D are a top plan view, a front elevation view, a cross sectional view as taken along line C-C ofFIG. 2B , and a cross sectional view as taken along line D-D ofFIG. 2A , respectively. -
FIG. 3 is a perspective view of a valve assembly. -
FIG. 4 is a perspective view of the valve assembly as disassembled. -
FIGs. 5A, 5B, and 5C illustrate a valve assembly, and are a top plan view, a cross sectional view as taken along line B-B ofFIG. 5A , and a cross sectional as taken along line C-C ofFIG. 5A , respectively. -
FIG. 6 is a perspective view of a cap to be mounted on the liquid fuel cartridge. -
FIG. 7 is a perspective view of an attachment. -
FIG. 8 is a perspective view of the attachment as disassembled. -
FIGs. 9A and 9B illustrate that the liquid fuel cartridge is brought into engagement with the attachment at a point of time in an engagement process. -
FIGs. 10A and 10B illustrate that the liquid fuel cartridge is brought into engagement with the attachment at another point of time in an engagement process. -
FIGs. 11A and 11B illustrate that the liquid fuel cartridge is brought into engagement with the attachment at a further point of time in an engagement process. -
FIGs. 12A and 12B illustrate that the liquid fuel cartridge is brought into engagement with the attachment at a still further point of time in an engagement process. -
FIG. 13 illustrates an end surface of the liquid fuel burner as cross sectioned along line XIII-XIII ofFIG. 1 . - Now, an embodiment of the present invention will be described below in detail with reference to the accompanying drawings.
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FIG. 1 illustrates a liquid fuel burner of an embodiment of the present invention, a part (a front part) of which is cut away. As illustrated inFIG. 1 , a liquid fuel burner 1 includes aliquid fuel cartridge 3, anattachment 5, aliquid fuel tank 7 having afuel feed port 7A, and aburner assembly 9. - The
burner assembly 9 is operable to burn the liquid fuel (generally, kerosene oil) fed from theliquid fuel tank 7. In this embodiment, theburner assembly 9 is provided with a wick-type burner having a burning capacity of 2200W. - In this embodiment, the configuration of the burner is the same as that of a commercially available liquid fuel burner, except the
liquid fuel cartridge 3 and theattachment 5. Using theattachment 5 allows theliquid fuel cartridge 3 to be mounted to various types of commercially available liquid fuel burners. - In this embodiment, an inserting direction ID of the
liquid fuel cartridge 3 is defined as a vertically downward direction on the paper ofFIG. 1 as indicated with an arrow inFIG. 1 . The inserting direction ID is used as a reference when identifying various directions in other figures. - Referring to
FIGs. 2 to 5 , theliquid fuel cartridge 3 will be described below. - Specifically,
FIGs. 2A, 2B, 2C, and 2D are a top plan view, a front elevation view, a cross sectional view as taken along line C-C ofFIG. 2B , and a vertical cross sectional view as taken along line D-D ofFIG. 2A , respectively, each illustrating the liquid fuel cartridge mounted with a cap. Theliquid fuel cartridge 3 is filled with liquid fuel (e.g. kerosene oil). Theliquid fuel cartridge 3 filled with the liquid fuel is put on sale and sold to the consumer. Theliquid fuel cartridge 3 includes acartridge body 11 made of a resin and having afuel discharge port 11A, and avalve assembly 13 to be mounted to thefuel discharge port 11A of thecartridge body 11. Thevalve assembly 13 is mounted with acap 15. Thecartridge body 11 includes abottom portion 11B, amain body portion 11C continuous with thebottom portion 11B, and acentral portion 11D continuous with themain body portion 11C. In themain body portion 11C, afinger hook recess 11E is continuously formed to be outwardly opened so as to be engaged with a plurality of fingers of a worker or a person who replaces the liquid fuel cartridge with another one. A hook may be formed unitarily with an outer surface of thebottom portion 11B to be engaged with one or more fingers of the worker. -
FIG. 3 through FIGs. 5A to 5C illustrate thevalve assembly 13 that is detached from thecartridge body 11.FIG. 3 is a perspective view of thevalve assembly 13.FIG. 4 is a perspective view of the disassembledvalve assembly 13.FIGs. 5A, 5B, and 5C are a top plan view, a cross sectional view as taken along line B-B ofFIG. 5A , and a cross sectional as taken along line C-C ofFIG. 5A , respectively. Thevalve assembly 13 includes avalve seat structure 17 made of a resin, avalve element 19 made of a resin, an open/close energizingelement 21 formed of a metallic coil spring, and a pressingmember 23 made of a resin. The material for the open/close energizingelement 21 is not limited to metals, but may be made of a resin. - The
valve seat structure 17 includes abottom wall portion 25 having a throughhole 29 formed in a central portion thereof to allow the liquid fuel to pass therethrough, and aperipheral wall portion 27 extending upright from an outer periphery of thebottom wall portion 25. Anannular flange portion 28 is unitarily formed with an end portion of theperipheral wall portion 27 that is located opposite to thebottom wall portion 25. Anannular valve seat 31 is formed around the throughhole 29 formed in thebottom wall portion 25. - In an
outer wall portion 33 of theperipheral wall portion 27 of thevalve seat structure 17, fourgroove portions 35 are formed, and four protrudingportions 37 are respectively formed in the fourgroove portions 35. Thegroove portions 35 are opened in the inserting direction ID and are also opened outwardly in an orthogonal direction orthogonal to the inserting direction ID. As viewed from an outside in the orthogonal direction, an outline of an innercircumferential surface 35a of each of thegroove portions 35 is triangularly shaped such that the triangular outline has a base on the side of thebottom wall portion 25 and a dimension of the outline as measured in the circumferential direction becomes smaller toward an apex of the triangle. In this embodiment, the apex constitutes a firstopposed portion 35A of the innercircumferential surface 35a of eachgroove portion 35. - An outline of an outer
circumferential surface 37a of each of the protrudingportions 37 is shaped such that the outline has an apex (a leading end) 37A in an opening of thegroove portion 35 opened in the inserting direction ID, and a dimension of the outline as measured in the circumferential direction becomes larger in a direction opposite to the inserting direction ID and then becomes smaller in a direction opposite to the inserting direction ID. In this embodiment, an end surface of the protrudingportion 37 that is located in a direction opposite to the inserting direction ID constitutes a secondopposed portion 37B of the outercircumferential surface 37a of the protrudingportion 37. The end surface of each protrudingportion 37 that constitutes the secondopposed portion 37B is slightly curved to be convex in the inserting direction ID. In terms of positional relationship, the firstopposed portion 35A and the secondopposed portion 37B are opposed to each other in the inserting direction ID. Specifically, the innercircumferential surfaces 35a of thegroove portions 35 and the outercircumferential surfaces 37a of the protrudingportions 37 are shaped such that in a process in which thevalve seat structure 17 is inserted into a recessedportion 67 of theattachment 5 which will be described later in detail,engagement projecting portions 73 of theattachment 5 are respectively guided into thegroove portions 35 along the innercircumferential surfaces 35a of thegroove portions 35 or the outercircumferential surfaces 37a of the protrudingportions 37, and that when thevalve seat structure 17 is further inserted into the recessedportion 67, theengagement projecting portions 73 are respectively guided such that each of theengagement projecting portions 73 is situated between the firstopposed portion 35A of the innercircumferential surface 35a of thegroove portion 35 and the secondopposed portion 37B of the outercircumferential surface 37a of the protrudingportion 37, the first and secondopposed portions - As illustrated in
FIG. 5A , fourgroove portions 35 and four protrudingportions 37 are each arranged at a predetermined pitch in the circumferential direction. In this embodiment, a pitch P that is an angular interval between two apexes (35A) of theadjacent groove portions 35, a pitch P between two apexes of the adjacent protrudingportions 37 are 360°/4 = 90°. - The leading
portion 36A, which is located in the inserting direction ID, of awall portion 36 located between twoadjacent groove portions 35 and the leadingportion 37A of each protrudingportion 37, which is located in the inserting direction ID, are shaped such that the respective dimensions as measured in the circumferential direction gradually become smaller in the inserting direction. A pitch that is an angular interval between the leadingportion 36A of thewall portion 36 and the leadingportion 37A of the protrudingportion 37 that are adjacent to each other is 360°/8 = 45°. On the surface of thewall portion 36 located in twoadjacent groove portions 35 and the surfaces of the four protrudingportions 37, partialmale screw portions cap 15. - As illustrated in
FIGs. 3 and5A , twocap engaging portions 38 are formed in the vicinity of theflange portion 28 of theouter wall portion 33 of thevalve seat structure 17 so as to be engaged with thecap 15. The twocap engaging portions 38 are disposed 180 apart from each other in the circumferential direction. Thecap engaging portions 38 each include aninclined portion 38A that gradually becomes more distant from theouter wall portion 33 in the orthogonal direction along the circumference and aflat portion 38B continuous with theinclined portion 38A. - The
valve seat structure 17 is formed by injection molding. The parting line PL of a mold to be used in injection molding passes through the leadingportion 36A of thewall portion 36 as illustrated inFIG. 3 . A plurality of thinnedportions 33A are formed to prevent sinks. - As illustrated in
FIGs. 4 ,5B, and 5C , a pressing member engagedportion 34A to be fixedly engaged with the pressingmember 23 and a cartridge body engagedportion 34B to be engaged with thefuel discharge port 11A of thecartridge body 11 are formed inside the peripheral wall portion 27 (specifically, an inner wall portion 34) of thevalve seat structure 17. - The
valve element 19 includes avalve body portion 39, avalve member 41 disposed at a location opposed to thevalve seat 31 and co-operative with thevalve seat 31, a plurality of protrusions 43 (in this embodiment, eight protrusions) formed in an outer wall of thevalve body portion 39, and anaxial portion 45 extending from a central portion of thevalve body portion 39 in the inserting direction ID. The liquid fuel passes through avalley portion 44 defined between twoadjacent protrusions 43. - The open/close energizing
element 21 passes through theaxial portion 45, with oneend 21A of the open/close energizingelement 21 abutting on thevalve body portion 39 and theother end 21B abutting on the pressingmember 23. The open/close energizingelement 21 is operable to generate a pressing force that acts to press thevalve member 41 onto thevalve seat 31 when the open/close energizingelement 21 is released. - As illustrated in
FIG. 4 , the pressingmember 23 includes an open/close energizingelement receiving portion 47 that receives the open/close energizingelement 21, an annular valve seatstructure engaging portion 49 formed around an open/close energizingelement receiving portion 47, an axial throughhole 51 formed on an apex of the open/close energizing receivingportion 47, through which theaxial portion 45 passes, and afuel passage 53 formed around the open/close energizingelement receiving portion 47 to allow the liquid fuel to pass therethrough. The valve seatstructure engaging portion 49 is engaged with the pressing member engagedportion 34A formed in the inner wall portion of the valve seat structure 17 [seeFIG. 5C ] and then comes into fixed engagement with thevalve seat structure 17. Theother end 21B abuts on the periphery of the axial throughhole 51. -
FIG. 6 is a perspective view of thecap 15, as viewed from below thecap 15, to be mounted to the valve assembly illustrated inFIGs. 3 ,4 , and5A to 5C . Afemale screw portion 55 to be screwed with the partialmale portions FIG. 3 , and two engagedportions 57 to be engaged with acap engaging portion 38 illustrated inFIG. 5A are formed in an inner peripheral surface of thecap 15. The two engagedportions 57 are disposed 180° apart in the circumferential direction. The engagedportions 57 each include aninclined surface 57A that gradually becomes more distant radially inward from the inner peripheral surface of thecap 15 along the circumference in a direction opposite to a turning direction for mounting thecap 15, and aflat surface 57B extending from the terminal position of theinclined surface 57A, radially toward the inner peripheral surface. - Two
index portions 59 that indicate a finger pressing position are formed in an outer peripheral surface of thecap 15. The twoindex portions 59 are shifted from the two engagedportions 57 by 90° in the circumferential direction. The twoindex portions 59 are disposed apart from each other by 180° in the circumferential direction. - The
cap 15 is fitted with thevalve assembly 13 and thecap 15 is turned until thecap engaging portion 38 abuts on the engagedportions 57 with the partialmale screw portions female screw portion 55. Then, thecap 15 is further turned with respect to thevalve assembly 13. The engagedportions 57 climb on theinclined surfaces 38A of thecap engaging portions 38, slide on theflat surfaces 38B, and finally climb over thecap engaging portions 38. Thus, the liquid fuel cartridge will not be detached by turning thecap 15 in an opposite direction to the direction for tightening the liquid fuel cartridge since the engagedportions 57 are engaged with thecap engaging portions 38. Thus, this works as a so-called child safety lock that prevents a child from inadvertently opening the liquid fuel cartridge 3 [seeFIGS. 2C and 2D ]. To open theliquid fuel cartridge 3, the child safety lock should be released by tightly gripping thecap 15 with fingers at the twoindex portions 59 to deform thecap 15, thereby widening the distance between the engagedportions 57, and while maintaining this state, turning thecap 15 with respect to thevalve assembly 13 in the opposite direction to the direction for closing the cap. This causes the engagedportions 57 to climb over thecap engaging portions 38, thereby releasing the child safely lock. -
FIG. 7 is a perspective view of the attachment.FIG. 8 is a perspective view of the disassembled attachment. Theattachment 5 is mounted to thefuel feed port 7A of theliquid fuel tank 7. Theattachment 5 includes anattachment body portion 61, apushup energizing element 63, and apartition plate 65. Theattachment body portion 61 includes a recessedportion 67 to be engaged with thevalve seat structure 17, apushup pin 69 provided in the recessedportion 67 and configured to push up thevalve element 19 with thevalve seat structure 17 being fitted in the recessedportion 67, and four fuel discharge holes 71 formed in the recessedportion 67 and configured to allow the liquid fuel, which has been discharged from the liquid fuel cartridge into the recessedportion 67, to pass therethrough. - A plurality of
engagement projecting portions 73 are provided on an inner wall portion of the recessedportion 67 to project inwardly of the recessedportion 67 and arranged at a predetermined pitch in the circumferential direction of therecess portion 67. In this embodiment, there are fourengagement projecting portions 73. The pitch that is an angular interval between two adjacentengagement projecting portions 73 is 360°/4 = 90°. Theengagement projecting portions 73 are each shaped such that a dimension, as measured in the circumferential direction, of a leadingportion 73A extending in a pull-out direction opposite to the inserting direction ID gradually becomes smaller in the pull-out direction. - The
pushup energizing element 63 is provided around thepushup pin 69. Thepartition plate 65 is an annular member having a throughhole 75 formed in a central portion thereof, and is supported by thepushup energizing element 63. When thepushup energizing element 63 is released, thepartition plate 65 is supported by thepushup energizing element 63 and the fourengagement projecting portions 73, and is configured not to be positioned above the fourengagement projecting portions 73. When engaging the liquid fuel cartridge with theattachment 5, thebottom wall portion 25 of thevalve seat structure 17 of thevalve assembly 13 abuts on thepartition plate 65. To reduce an area where thebottom wall portion 25 contacts thepartition plate 65, fourprojections 77 are formed on the surface of thepartition plate 65. -
FIGs. 9A and 9B toFigs. 12A and 12B illustrate that the liquid fuel cartridge is to be engaged with the attachment. In these figures,FIGs. 9A ,10A ,11A , and12A are cross sectional views of theliquid fuel cartridge 3 and theattachment 5. In correspondence withFIGs. 9A ,10A ,11A , and12A ,FIGs. 9B ,10B ,11B , and12B schematically illustrate the engagement process of thegroove portions 35 and protrudingportions 37 formed in theouter wall portion 33 of thevalve seat structure 17 with theengagement projecting portions 73 provided on the inner wall portion of theattachment 5. - To engage the
liquid fuel cartridge 3 with theattachment 5, the side where thevalve assembly 13 of theliquid fuel cartridge 3 is located is caused to face the recessedportion 67 of theattachment 5 and then theliquid fuel cartridge 3 is inserted into the recessedportion 67 of the attachment 5 [seeFIGs. 9A and 9B ]. In this state, theengagement projecting portions 73 are positioned outside thegroove portions 35 as illustrated inFIG. 9B . While softly applying a pushing-down force to theliquid fuel cartridge 3 in the inserting direction ID, theliquid fuel cartridge 3 is turned (regardless of the turning direction) around an imaginary centerline IL of theaxial portion 45 of thevalve element 19. Then, theengagement projecting portions 73 are guided along the innercircumferential surfaces 35a of thegroove portions 35 or the outercircumferential surfaces 37a of the protrudingportions 37 into the groove portions 35 [seeFIGs. 10A and 10B ] since the leadingportions portions 73A of theengagement projecting portions 73 each have a small contact area. From this point, theliquid fuel cartridge 3 is further pressed in the inserting direction ID. Theengagement projecting portions 73 are guided along the innercircumferential surfaces 35a of thegroove portions 35 and reach the firstopposed surface portion 35A [seeFIGs. 11A and 11B ] . InFIGs. 11A and 11B , the open/close energizingelement 21 is energized since thevalve element 19 is pushed up by thepushup pin 69, and thepushup energizing element 63 is energized since thevalve seat structure 17 pushes down thepartition plate 65. Namely, the open/close energizingelement 21 and thepushup energizing element 63 co-operatively work as the energizing means. At this point, releasing the pressing force to press theliquid fuel cartridge 3 in the inserting direction ID releases the open/close energizingelement 21 andpushup energizing element 63 to cause theliquid fuel cartridge 3 to move in the pull-out direction. Theengagement projecting portions 73, however, abut on the secondopposed portions 37B of the protrudingportions 37 before the open/close energizingelement 21 andpushup energizing element 63 are fully released, and the engagement of theliquid fuel cartridge 3 and theattachment 5 is completed [seeFIGs. 12A and 12B ]. InFIGs. 12A and 12B , thepushup pin 69 still pushes up thevalve element 19, thereby causing the liquid fuel to flow out of thefuel discharge port 11A and flow in order through thefuel passage 53 of the pressingmember 23 and the throughhole 29 of thevalve seat structure 17 and out to theattachment 5. The liquid fuel further passes through thefuel discharge port 71 of theattachment 5 and reaches theliquid fuel tank 7. - To detach the
liquid fuel cartridge 3 from theattachment 5, while applying the pushing-down force to theliquid fuel cartridge 3, theliquid fuel cartridge 3 is turned to cause theengagement projecting portions 73 to be guided along the innercircumferential surfaces 35a of thegroove portions 35 and slide out to release the engagement [the disengagement process followsFIGs. 12A and 12B ,FIGs. 11A and 11B ,FIGs. 10A and 10B , andFIGs. 9A and 9B in this order]. - The liquid fuel burner 1 includes a
frame structure 81 and alid 83 as illustrated inFIG. 1 . Theframe structure 81 includes acartridge chamber 85 to receive theliquid fuel cartridge 3 and aburner assembly chamber 87 to receive theburner assembly 9. Aheat insulating plate 89 is provided between thecartridge chamber 85 and theburner assembly chamber 87. Theframe structure 81 and theheat insulating plate 89 are made of a metal plate. Thelid 83 blocks an upper opening of thecartridge chamber 85 and is opposed to abottom portion 11B of thecartridge body 11 with theliquid fuel cartridge 3 being received in thecartridge chamber 85. - Heat from the
burner assembly 9 scatters around theburner assembly 9. A top plate of theframe structure 81 and a portion of theheat insulating plate 89 in the vicinity of the top plate are heated to a fairly or quite high temperature by heat scattering upward, and in turn the heat from the heated top plate and the heated portion of theheat insulating plate 89 heats the cartridgemain portion 11C of thecartridge body 11. In this embodiment, the temperature of the cartridgemain portion 11C of thecartridge body 11 is designed to be lower than the temperature of starting thermal deformation while increasing the volume of thecartridge body 11 by devising the dimension and shape of thecartridge body 11. Namely, as illustrated inFIG. 1 andFIGs. 2A to 2D , the outside dimension of the cartridgemain portion 11C is designed to be smaller than the outside dimension of acentral portion 11D of thecartridge body 11, and a gap S1 is provided between theheat insulating plate 89 and the cartridgemain portion 11C. Further, a heat insulating space S2 is provided between thecartridge body 11 and thebottom portion 11B. - Referring to
FIGs. 1 and13 , specific dimensions of thecartridge body 11 of the embodiment are described below.FIG. 13 illustrates an end surface of the liquid fuel burner as cross sectioned along line XIII-XIII ofFIG. 1 , and shows only necessary part of thecartridge body 11, theframe structure 81, and theheat insulating plate 89. The outside dimension of thecentral portion 11D of thecartridge body 11 is set to 86 mm, and that of the cartridgemain portion 11C is set to 80 mm. The thickness of the gap S1 is set to 6.64 mm and that of the heat insulating space S2 is set to 50.7 mm. With these settings, the temperature of the cartridgemain portion 11C and that of thebottom portion 11B will not be higher than 50°C at room temperature of 25°C at the time that the burner assembly with a burning capacity of 2200W burns the liquid fuel. - The embodiment of the present invention is specifically described above, but the present invention is not limited to this embodiment. Variations, modifications, and changes are possible within the scope of technical ideas of the present invention. In the embodiment described above, the
pushup energizing element 63 is provided in the recessedportion 67 of theattachment 5, and is co-operative with the open/close energizingelement 21 to work as the energizing means. The pushup energizing element is optionally provided. In other words, the open/close energizingelement 21 may also work as the energizing means without providing thepushup energizing element 63. - According to the present invention, it is possible to provide a liquid fuel burner provided with a liquid fuel cartridge made of a resin, not a metal, which is not deformed due to the effect of heat of the burner when the liquid fuel cartridge is received in the cartridge chamber. Further, in this liquid fuel burner, replacement of the liquid fuel burner is easy.
Claims (6)
- A liquid fuel burner comprising:a liquid fuel cartridge (3) including:a cartridge body (11) having a fuel discharge port (11A); anda valve assembly (13) mounted to the fuel discharge port (11A);a liquid fuel tank (7) having a fuel feed port (7A) and provided with an attachment (5) at the fuel feed port (7A), the attachment (5) being configured to be fitted with a part of the valve assembly (13) of the liquid fuel cartridge (3);a burner assembly (9) operable to burn a liquid fuel fed from the liquid fuel tank (7);a frame structure (81) configured to receive the liquid fuel tank (7) and including a heat insulating plate (89) that partitions a cartridge chamber (85) to receive the liquid fuel cartridge (3) and a burner assembly chamber (87) to receive the burner assembly (13); anda lid (83) configured to block an upper opening of the cartridge chamber (85), characterized in that:the cartridge body (11) is formed of a resin molded product;the cartridge body (11) includes a bottom portion (11B) opposed to the lid (83), a main body portion (11C) continuous with the bottom portion (11B), and a central portion (11D) continuous with the main body portion (11C); andan outer dimension of the main body portion (11C) of the cartridge body (11) is smaller than an outer dimension of the central portion (11D) of the cartridge body (11) such that a gap (S1) is defined between the heat insulating plate (89) and the main body portion (11C) of the cartridge body (11) wherein the gap (S1) works to make a temperature of the main body portion (11C) lower than a staring temperature of thermal deformation.
- The liquid fuel burner according to claim 1, wherein:the burner assembly (9) includes a wick-type burner having a burning capacity of 2200 W or more;the cartridge body (11) is formed of a polyethylene terephthalate resin, and the frame structure (81) and the heat insulating plate (89) are each made of a metal plate; andthe gap (S1) is 6 mm or more in thickness.
- The liquid fuel burner according to claim 1, wherein:a heat insulating space (S2) is provided between the lid (83) and the bottom portion (11B) of the cartridge body (11) so as to prevent the temperature of the bottom potion (11B) from rising above the starting temperature of thermal deformation due to heat transferred to the lid (83) from a top plate of the frame structure (81).
- The liquid fuel burner according to claim 3, wherein:the burner assembly (9) includes a wick-type burner having a burning capacity of 2200 W or more;the cartridge body (11) is formed of a polyethylene terephthalate resin, and the frame structure (81) and the heat insulating plate (89) are each made of a metal plate; andthe heat insulating space (S2) is 40 mm or more in thickness.
- The liquid fuel burner according to claim 1, wherein:a finger hook recess (11E) is continuously formed in a circumferential direction of the main body portion (11C) of the cartridge body (11) to be opened outwardly such that a worker who replaces the liquid fuel cartridge (3) can hook his/her fingers in the recess (11E).
- The liquid fuel burner according to claim 1, wherein:a hook is integrally formed with an outer surface of the bottom portion (11B) of the cartridge body (11) such that a worker who replaces the liquid fuel cartridge (3) can insert his/her one or more fingers into the hook.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017020404 | 2017-02-07 | ||
JP2018012403A JP7090853B2 (en) | 2017-02-07 | 2018-01-29 | Liquid fuel combustor |
Publications (1)
Publication Number | Publication Date |
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EP3358254A1 true EP3358254A1 (en) | 2018-08-08 |
Family
ID=61163569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18155112.8A Pending EP3358254A1 (en) | 2017-02-07 | 2018-02-05 | Liquid fuel burner |
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EP (1) | EP3358254A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5549470A (en) * | 1994-12-29 | 1996-08-27 | Henderson; Richard W. | Anti-flareup device for liquid fuel burners |
US5662468A (en) * | 1995-08-14 | 1997-09-02 | Henderson; Richard W. | Device that prevents flareup in liquid fuel burners |
JPH09229347A (en) * | 1996-02-19 | 1997-09-05 | Fujiya Hayano | Refueling construction of stove |
-
2018
- 2018-02-05 EP EP18155112.8A patent/EP3358254A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5549470A (en) * | 1994-12-29 | 1996-08-27 | Henderson; Richard W. | Anti-flareup device for liquid fuel burners |
US5662468A (en) * | 1995-08-14 | 1997-09-02 | Henderson; Richard W. | Device that prevents flareup in liquid fuel burners |
JPH09229347A (en) * | 1996-02-19 | 1997-09-05 | Fujiya Hayano | Refueling construction of stove |
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