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(11) | EP 3 650 754 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | FLAME-RESISTANT WICK |
| (57) A flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) comprises a hollow chamber (10) and
at least one capillary structure (20; 20a) surrounding the hollow chamber (10). The
at least one capillary structure (20; 20a) is interlaced by a plurality of wire strands
(21, 22) into a tubular shape. Each of the plurality of wire strands (21, 22) consists
of a plurality of core wires (211, 221; 211c, 221c; 211d, 221d) being made of a material
having a melting point of not less than 800 °C.
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BACKGROUD
[0001] The present invention relates to a wick and, more particular, to a flame-resistant wick that possesses excellent heat resistant property.
[0002] A conventional lamp device includes a fuel cup storing fuel, a high temperature resistant disk mounted on the fuel cup, and a wick inserted through the disk to connect with fuel stored in the fuel cup. Moreover, the wick is normally made out of braided cotton and works by capillary action. Fuel is drawn up through the wick to reach the flame produced on the disk. The above lamp device is actively used for various purposes, such as lighting, decorating, or increasing atmosphere. For example, an oil lamp is used in religion, or an alcohol lamp is used in medical or chemical laboratories.
[0003] The conventional cotton wick must be cut to a predetermined length adapted for being mounted to the lamp device. However, after trimming, the cotton wick is easily loosened at its terminal end to cause it to be difficult to insert through the disk. After ignition, fuel vaporizes and combusts on the wick, and the tip of the cotton wick will be carbonized and burnt out gradually on the tip due to a higher temperature on the top of flame. Thus, the cotton wick must be pulled out from the disk and trimmed to a certain length every once in a while to maintain a combustion scale. Trimming the cotton wick results in the wick eventually being unconnected with fuel, so that users can only replenish fuel or replace a new wick. It is inconvenient and wasteful.
[0004] The wick length, diameter, stiffness and flame-resistant are the major factors used to adjust fuel wicking and flame scale for the lamp device. However, the cotton wicks with low stiffness and flame-resistant cannot be adjusted easily to maintain proper fuel wicking and flame scale. High viscosity or high flash point fuels result in carbon deposits being produced and are difficult to ignite. If the fuel drawn is slower than it burns, the wick will be carbonized and become burnt out. If the fuel drawn is more than it burns, usually occurring on burning high flash point fuel, slow evaporation of the fuel will be caused, producing soot due to incomplete combustion. Incomplete combustion not only produces soot but also toxic fumes.
[0005] Taiwan Patent No. 493,722 discloses a wick including a plurality of fiberglass filaments disposed and assembled at a center thereof to form a fiberglass layer, and a plurality of fiberglass yarns and melted silks arranged around the fiberglass layer. The fiberglass layer is able to draw fuel by capillary action, is hard to burn down, and is not easily loosened at its terminal end. However, the fiberglass layer does not draw fuel effectively causing the flame to extinguish easily, and the flame scale is difficult to be controlled. Moreover, Taiwan Patent No. 580,106 discloses a wick including a cotton thread enabling fuel to be drawn and a plurality of fiberglass filaments covering around the cotton thread to avoid the cotton thread from being loosened to provide a compound wick.
[0006] Therefore, the wick disclosed by said patents both include fiberglass filaments, but the fiberglass is expensive and difficult to process. The wick is a large quantity of consumable items, but the fiberglass wick is expensive and not environment-friendly. Additionally, when the fiberglass wick is processed, inhaling the fiberglass can cause damage to human lungs and can be harmful to manufacturing personnel. Inhaling of fiberglass will jeopardize the health of workers during fiberglass-reinforced plastic processing. The fiberglass fiber can also cause skin, eye and throat irritation to users. At higher exposure levels, fiberglass also has been associated with skin rashes and difficulty in breathing.
[0007] Further, the melting point of the fiberglass wick is only about 680 °C, so that the fiberglass wick will be carbonized and burned out under the flame burning of 1000 °C, but only slower than the cotton wick. Therefore, the fiberglass wick needs be trimmed also.
[0008] Furthermore, the fiberglass wick and the cotton wick are easy to sag due to gravity when they are saturated with fuel. Thus, the user cannot adjust the flame height or scale easily. If a user wants to adjust the flame height or scale, the user has to pull the wick out from the lamp device constantly. At the same time, the user may also contact fuel in the wick and cause inconvenience or even danger.
SUMMARY
[0010] A flame-resistant wick according to the present invention comprises a hollow chamber and at least one capillary structure surrounding the hollow chamber. The at least one capillary structure is interlaced by a plurality of wire strands into a tubular shape. Each of the plurality of wire strands consists of a plurality of core wires being made of a material having a melting point of not less than 800 °C.
[0011] In an example, at least one of the plurality of core wires is made of metals whose melting point of not less than 800 °C or carbon fiber material.
[0013] In an example, the at least one of the plurality of core wires is made of copper, and the others of the plurality of core wires are made of non-copper materials.
[0014] In an example, at least one of the others of the plurality of core wires is made of carbon fiber material.
[0015] In an example, the number of the plurality of core wires made of copper is not greater than the number of the plurality of core wires made of non-copper materials in each of the plurality of wire strands.
[0016] In an example, each of the plurality of core wires has a different wire diameter to the others.
[0018] In an example, the at least one capillary structure is capable of being bent into a U shape to form an igniting end and two drawing ends located opposite to the igniting end.
[0019] In an example, the plurality of wire strands includes a plurality of first wire strands and a plurality of second wire strands interlaced with one another. Each of the plurality of first wire strands interlaces with at least one of the plurality of second wire strands to form an acute angle.
[0020] In an example, the plurality of first wire strands and the plurality of second wire strands interlace with one another to form a plurality of meshes. Each of the plurality of meshes has the acute angle.
[0021] In an example, the at least one capillary structure includes two capillary structures, which are mounted around one another and extend along a central axis of the hollow chamber.
[0022] The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023]
FIG. 1 is a perspective view of a flame-resistant wick of a first embodiment according to the present invention.
FIG. 2 is an enlarged partial perspective view of FIG. 1.
FIG. 3 is a schematic view showing the flame-resistant wick of FIG. 1 to be bended and inserted into a fuel container.
FIG.4 is a cross-section view of FIG. 3.
FIG. 5 is a perspective view of a flame-resistant wick of a second embodiment according to the present invention.
FIG. 6 is an enlarged partial perspective view of a flame-resistant wick of a third embodiment according to the present invention.
FIG. 7 is an enlarged partial perspective view of a flame-resistant wick of a fourth embodiment according to the present invention.
FIG. 8 is an enlarged partial perspective view of a flame-resistant wick of a fifth embodiment according to the present invention.
FIG. 9 is an enlarged partial perspective view of a flame-resistant wick of a sixth embodiment according to the present invention.
DETAILED DESCRIPTION
[0024] FIGS. 1-4 show a flame-resistant wick 1 of a first embodiment according to the present invention. The flame-resistant wick 1 includes a hollow chamber 10 and at least one capillary structure 20.
[0025] In the embodiment, the flame-resistant wick 1 may include one capillary structure 20 surrounding the hollow chamber 10 and interlaced by a plurality of wire strands into a tubular shape to cause the capillary structure 20 being flexible.
[0026] The plurality of wire strands includes a plurality of first wire strands 21 and a plurality of second wire strands 22 interlaced with one another. Each of the plurality of first wire strands 21 interlaces with at least one of the plurality of second wire strands 22 to form an acute angle θ. Thus, the plurality of first wire strands 21 and the plurality of second wire strands 22 interlace with one another to form a plurality of meshes 23, and each of the plurality of meshes 23 has the acute angle θ. Further, each of the plurality of first wire strands 21 consists of a plurality of first core wires 211, and each of the plurality of second wire strands 22 consists of a plurality of second core wires 221. Furthermore, the plurality of first and second core wires 211 and 221 are made of a material having a melting point of not less than 800 °C to provide flame-resistant purpose.
[0027] Moreover, the plurality of first and second core wires 211 and 221 can be made of metals whose melting point of not less than 800 °C or carbon fiber material and have the same wire diameter. The metals may include copper or stainless steel. The melting point of copper is about 1085 °C, the melting point of stainless steel is about 1400 °C, and the melting point of carbon fiber material is about 1500 °C, all of which are materials with a melting point of not less than 800 °C, minimize carbonization and dissipation to achieve a flame-resistant effect under the flame burning of 1000 °C. In addition, according to the flame reaction, the color of the ignited flame can be adjusted by changing the material of the plurality of first and second core wires 211 and 221, for example, one of the plurality of first and second core wires 211 and 221 is made of copper, so that a green flame can be obtained after ignition.
[0028] FIGS. 3 and 4 show the capillary structure 20 to be bent into a U shape to form an igniting end 24 and two drawing ends 25 located opposite to the igniting end 24 before the flame-resistant wick 1 is inserted into a fuel container S. Therefore, the flame-resistant wick 1 can be used for various fuel containers S with different heights without cutting.
[0029] FIG. 5 show a flame-resistant wick 1a of a second embodiment according to the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter a. The second embodiment includes two capillary structures 20 and 20a, which are mounted around one another and extend along a central axis C of the hollow chamber 10 to maintain the shape after bending easily.
[0030] FIG. 6 show a flame-resistant wick 1b of a third embodiment according to the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter b. The at least one of the plurality of first core wires 2111b and the at least one of the plurality of second core wires 2211b are made of copper. The others of the plurality of first core wires 2112b and the others of the plurality of second core wires 2212b are made of non-copper materials such as stainless steel. Thus, the number of the plurality of first and second core wires 2111b and 2211b made of copper is not greater than the number of the plurality of first and second core wires 2112b and 2212b made of non-copper materials. Therefore, the at least one of the plurality of first and second core wires 2111b and 2211b made of copper improve the thermal conductivity of the flame-resistant wick 1b to facilitate heat transfer, so that the fuel is more easily vaporized, thereby improving combustion efficiency.
[0031] FIG. 7 show a flame-resistant wick 1c of a fourth embodiment according to the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter c. Each of the plurality of first and second core wires 211c and 221c has a different wire diameter to the others to change the size of the meshes 23c to increase the capillary action of the flame-resistant wick 1c to improve the combustion efficiency.
[0032] FIG. 8 show a flame-resistant wick Id of a fifth embodiment according to the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter d. The plurality of first and second core wires 211d and 221d are made of carbon fiber material. The denier count of the carbon fiber material can be between 150 to 300 denier, thereby improving the structural strength and capillary action of the flame resistant wick Id to improve the combustion efficiency.
[0033] FIG. 9 show a flame-resistant wick 1e of a sixth embodiment according to the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter e. The at least one of the plurality of first core wires 2111e and the at least one of the plurality of second core wires 2211e are made of copper. The others of the plurality of first core wires 2112e and 2113e, and the others of the plurality of second core wires 2212e and 2213e are made of non-copper materials such as stainless steel and carbon fiber material. Further, at least one of the others of the plurality of first core wires 2112e and 2113e, and at least one of the others of the plurality of second core wires 2212e and 2213e are made of carbon fiber material. Thus, the number of the plurality of first and second core wires 2111e and 2211e made of copper is not greater than the number of the plurality of first and second core wires 2112e, 2113e, 2212e, and 2213e made of non-copper materials, but is equal to the number of the plurality of first and second core wires 2112e, 2113e, 2212e, and 2213e made of carbon fiber material.
[0034] The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e according to the present invention include the following advantages:
- 1. The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e are made of the material having a melting point of not less than 800 °C, so that it cannot be carbonized or consumed ,to fix its shape and height thereof to maintain the flame combustion scale.
- 2. The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e include an end producing the flame thereon and heated by the flame to cause fuel drawn to the end thereof to be vaporized and combusted more completely due to a higher wick temperature.
- 3. The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e do not loosen at its terminal end after cutting a predetermined length or trimming to be mounted on the fuel container S.
- 4. The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e are made of metals or carbon fiber material reducing manufacturing costs to provide a popular price.
- 5. The flame-resistant wicks 1; 1a; 1b; 1c; 1d; 1e are flexible and are capable of being bent into a U shape to be employed in many ways.
1. A flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) comprising:
a hollow chamber (10); and
at least one capillary structure (20; 20a) surrounding the hollow chamber (10) and interlaced by a plurality of wire strands (21, 22) into a tubular shape, with each of the plurality of wire strands (21, 22) consisting of a plurality of core wires (211, 221; 211c, 221c; 211d, 221d) made of a material having a melting point of not less than 800 °C.
2. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 1, wherein at
least one of the plurality of core wires (211, 221; 211c, 221c; 211d, 221d) is made
of metals whose melting point of not less than 800 °C or carbon fiber material.
3. The flame-resistant wick (1; 1a; 1b; 1c; 1e) as claimed in claim 2, wherein the metals
include copper or stainless steel.
4. The flame-resistant wick (1b; 1e) as claimed in claim 3, wherein the at least one
of the plurality of core wires (2111e, 2211e) is made of copper, and wherein the others
of the plurality of core wires (2112e, 2212e) are made of non-copper materials.
5. The flame-resistant wick (1e) as claimed in claim 4, wherein at least one of the others
of the plurality of core wires (2113e, 2213e) is made of carbon fiber material.
6. The flame-resistant wick (1b; 1e) as claimed in claim 4, wherein the number of the
plurality of core wires (2111e, 2211e) made of copper is not greater than the number
of the plurality of core wires (2112e, 2212e) made of non-copper materials in each
of the plurality of wire strands (21,22).
7. The flame-resistant wick (1c) as claimed in claim 1, wherein each of the plurality
of core wires (211c, 221c) has a different wire diameter to the others.
8. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 1, wherein the
at least one capillary structure (20; 20a) is flexible.
9. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 8, wherein the
at least one capillary structure (20; 20a) is capable of being bent into a U shape
to form an igniting end (24) and two drawing ends (25) located opposite to the igniting
end (24).
10. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 1, wherein the
plurality of wire strands (21, 22) includes a plurality of first wire strands (21)
and a plurality of second wire strands (22) interlaced with one another, and wherein
each of the plurality of first wire strands (21) interlaces with at least one of the
plurality of second wire strands (22) to form an acute angle (θ).
11. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 10, wherein the
plurality of first wire strands (21) and the plurality of second wire strands (22)
interlace with one another to form a plurality of meshes (23), and wherein each of
the plurality of meshes (23) has the acute angle (θ).
12. The flame-resistant wick (1a) as claimed in claim 1, wherein the at least one capillary
structure (20a) includes two capillary structures (20a), and wherein the two capillary
structures (20a) are mounted around one another and extend along a central axis (C)
of the hollow chamber (10).
Amended claims in accordance with Rule 137(2) EPC.
1. A flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) comprising:
a hollow chamber (10); and
at least one capillary structure (20; 20a) surrounding the hollow chamber (10) and interlaced by a plurality of wire strands (21, 22) into a tubular shape, with each of the plurality of wire strands (21, 22) consisting of a plurality of core wires (211, 221; 211c, 221c; 211d, 221d) made of a material having a melting point of not less than 800 °C, wherein
each of the plurality of core wires (211c, 221c) has a different wire diameter to the others, or wherein
the at least one capillary structure (20; 20a) is flexible and the at least one capillary structure (20; 20a) is capable of being bent into a U shape to form an igniting end (24) and two drawing ends (25) located opposite to the igniting end (24).
2. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 1, wherein at
least one of the plurality of core wires (211, 221; 211c, 221c; 211d, 221d) is made
of metals whose melting point of not less than 800 °C or carbon fiber material.
3. The flame-resistant wick (1; 1a; 1b; 1c; 1e) as claimed in claim 2, wherein the metals
include copper or stainless steel.
4. The flame-resistant wick (1b; 1e) as claimed in claim 3, wherein the at least one
of the plurality of core wires (2111e, 2211e) is made of copper, and wherein the others
of the plurality of core wires (2112e, 2212e) are made of non-copper materials.
5. The flame-resistant wick (1e) as claimed in claim 4, wherein at least one of the others
of the plurality of core wires (2113e, 2213e) is made of carbon fiber material.
6. The flame-resistant wick (1b; 1e) as claimed in claim 4, wherein the number of the
plurality of core wires (2111e, 2211e) made of copper is not greater than the number
of the plurality of core wires (2112e, 2212e) made of non-copper materials in each
of the plurality of wire strands (21, 22).
7. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 1, wherein the
plurality of wire strands (21, 22) includes a plurality of first wire strands (21)
and a plurality of second wire strands (22) interlaced with one another, and wherein
each of the plurality of first wire strands (21) interlaces with at least one of the
plurality of second wire strands (22) to form an acute angle (θ).
8. The flame-resistant wick (1; 1a; 1b; 1c; 1d; 1e) as claimed in claim 7, wherein the
plurality of first wire strands (21) and the plurality of second wire strands (22)
interlace with one another to form a plurality of meshes (23), and wherein each of
the plurality of meshes (23) has the acute angle (θ).
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description