Patent Grant
8735780
This application is a 35 U.S.C. §371 National Stage entry of International Application No. PCT/KR2009/001301, filed on Mar. 16, 2009, and claims priority to Korean Application No. 10-2008-0024235, filed on Mar. 17, 2008 each of which is hereby incorporated by reference in its entirety as if fully set forth herein.
The present disclosure relates to a heater supporter for supporting a heater and an electric hob including the heater supporter.
Cooking apparatuses are home appliances used to heat and cook foods using electricity or gas. Electric hobs, which have been recently introduced in the market, include a heating source and a plate disposed above the heating source so as to heat a container placed on the plate using the heating source for cooking food contained in the container. A sheath heater, which includes a metal tube and a heating element sealed inside the metal tube, is usually used as the heating source of the electric hob.
However, the above-described electric hobs of the related art have the following disadvantages.
First, the output power of the sheath heater that is used as a heating source is relatively low as compared with other heaters such as a tub heater which generates heat using electric resistance of a filament disposed inside a tube. Therefore, it is difficult to cook food rapidly using the sheath heater.
As explained above, the high-power tube heater includes a tube and a filament disposed inside the tube. However, it is difficult to install the tube heater (substantially, the tube) at a heater base and/or a reflector.
The tube heater can be installed at the heater base and/or the reflector using an additional member. In this case, heat is transferred from the tube heater to the heater base and/or the reflector through the additional member. Therefore, the heater base and/or the reflector can be damaged by heat of the tube heater.
Embodiments provide a heater supporter and an electric hob including the heater supporter, which are adapted to cook food rapidly.
Embodiments also provide a heater supporter and an electric hob including the heater supporter, which are configured to install a heater easily.
Embodiments also provide a heater supporter and an electric hob including the heater supporter, which are configured to be minimally damaged by heat generated from a heater.
In one embodiment, a heater supporter includes: a first supporter to which a tube heater is fixed; and a second supporter fixed to one of a heater base at which the tube heater is disposed and a reflector disposed between the tube heater and the heater base.
In another embodiment, a heater supporter includes: a heater fixing part to which a tube heater is fixed, the heater fixing part being formed of a heat resistant material; and an elastic supporting part having predetermined elasticity and fixed to one of a reflector and a heater base at which the tube heater is installed.
In further another embodiment, an electric hob includes: a heater base; a tube heater disposed at the heater base, the tube heater including a tube and a filament disposed inside the tube; a reflector disposed between the heater base and the tube heater and configured to reflect heat generated from the tube heater; and a heater supporter adapted to fix the tube to the heater base.
According to the present disclosure, food can be cooked more rapidly, and the tube heater can be easily installed. Furthermore, damages caused by heat generated from the tube heater can be minimized.
The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.
An electric hob will now be described according to a first embodiment with reference to the accompanying drawings.
Referring to
Referring to
In more detail, the heater base 110 forms a space in which the tube heater 130 is installed. In the current embodiment, the heater base 110 has a flat cylindrical shape with an opened top. A heater penetration opening 111 is formed through a portion of the rim of the heater base 110. Both end portions of the tube heater 130 are inserted through the heater penetration opening 111. The heater penetration opening 111 is formed by cutting a portion of the rim of the heater base 110 into a predetermined shape and size. In addition, a plurality of rim penetration holes 113 and a plurality of bottom penetration holes 115 (refer to
The reflector 120 reflects heat radiated from the tube heater 130. The reflector 120 has a shape corresponding to the shape of the heater base 110, and is disposed inside the heater base 110 in a manner such that the outer surface of the reflector 120 makes contact with the inner surface of the heater base 110. Heater penetration holes 121 are formed through the rim of the reflector 120. Both end portions of the tube heater 130 are inserted through the heater penetration holes 121. The heater penetration holes 121 are formed through a portion of the rim of the reflector 120 at a position aligned with the heater penetration opening 111.
The heater base 110 and the reflector 120 are fixed to each other through first fasteners L1. In the current embodiment, rivets are used as the first fasteners L1; however, the first fasteners L1 for coupling the heater base 110 and the reflector 120 are not limited to the rivets.
The tube heater 130 is installed inside the reflector 120. The tube heater 130 is used to heat food filled in a container. The tube heater 130 includes a tube 131, a filament 135, and two insulating parts 137.
The tube 131 forms the exterior of the tube heater 130. For example, a quartz tube having an approximately horseshoe shape or -shape is used as the tube 131. The tube 131 is disposed inside the reflector 120. Both end portions of the tube 131 inserted through the heater penetration holes 121 and the heater penetration opening 111 and extend outward from the reflector 120 and the heater base 110.
Pinch parts 133 are provided on both ends of the tube 131, respectively. The pinch parts 133 are adapted to seal the inside of the tube 131 and fix both ends of the filament 135 and the insulating parts 137. The pinch parts 133 may be formed by compressing both ends of the tube 131 into a flat shape.
The filament 135 is disposed inside the tube 131. Substantially, the filament 135 receives external electricity and generates heat. For this, both ends of the filament 135 are connected to an external power source. For example, the filament 135 may be formed of carbon or a carbon-containing material.
The insulating parts 137 insulate both ends of the filament 135, which are configured to be connected to the external power source. The insulating parts 137 are fixed together with both ends of the filament 135 by the pinch parts 133.
Rods (not shown) may be provided between both ends of the filament 135 and the insulating parts 137 so as to support both ends of the filament 135 elastically. In this case, metal pieces, which are connected to lead wires for receiving external power, may be connected to the rods through the insulating parts 137.
The heater holder 140 is configured to support both ends of the tube heater 130. The heater holder 140 is formed of a material such as metal that has predetermined elasticity for absorbing external impacts and heat resistant properties for resisting heat generated from the tube heater 130. Referring to
In more detail, the holder body 141 is shaped like a plate having a predetermined length. When the heater holder 140 is fixed to the heater base 110, the holder body 141 extends outward from the rim of the heater base 110 in a radial direction. The holder body 141 includes a first cutout 141A and second cutouts 141B. The first and second cutouts 141A and 141B are formed as a result of cutting portions of the holder body 141 to form a contact protrusion 144B (described later) and the reinforcing ribs 146. The first cutout 141A is formed by partially cutting an end portion of the holder body 141. The second cutouts 141B are formed by longitudinally cutting a pair of center portions of the holder body 141 which have a predetermined length. The second cutouts 141B are spaced a predetermined distance from each other in a width direction of the holder body 141.
The holder body 141 further includes coupling slots 141C at both side portions. The coupling slots 141C are formed to fix the heater supporting parts 147. The coupling slots 141C are formed by cutting both side portions of the holder body 141, which are located outside the second cutouts 141B, by a predetermined length in a longitudinal direction of the holder body 141.
The base fixing part 143 is formed on an end of the holder body 141. The base fixing part 143 includes a rim fixing part 144 and a bottom fixing part 145. The rim fixing part 144 and the bottom fixing part 145 are formed to fix the heater holder 140 to an inner surface of the heater base 110. In more detail, the rim fixing part 144 is located between the rims of the heater base 110 and the reflector 120. The bottom fixing part 145 is located between the bottoms of the heater base 110 and the reflector 120. The rim fixing part 144 and the bottom fixing part 145 are formed by bending a portion of the holder body 141 from a surface of the holder body 141 or a surface of the rim fixing part 144 to a predetermined angle. In the current embodiment, the rim fixing part 144 is formed by bending a portion of the holder body 141 at a right angle with a surface of the holder body 141, and the bottom fixing part 145 is formed by bending a portion of the rim fixing part 144 at a right angle with the rim fixing part 144. However, the angle between the holder body 141 and the rim fixing part 144, and the angle between the rim fixing part 144 and the bottom fixing part 145 may be varied according to the shapes of the heater base 110 and the reflector 120, specifically, the angles of the rim and bottom of the heater base 110 and the angles of the rim and bottom of the reflector 120.
A plurality of rim coupling holes 144A and a plurality of bottom coupling holes 145A are formed in the rim fixing part 144 and the bottom fixing part 145. Second fasteners L2 are inserted through the rim penetration holes 113 and the bottom penetration holes 115 and are coupled to the rim coupling holes 144A and the bottom coupling holes 145A. Like the first fasteners L1, rivets may be used as the second fasteners L2. However, the second fasteners L2 are not limited to rivets.
The contact protrusion 144B is formed at an end of the rim fixing part 144 opposite to the bottom fixing part 145, that is, at an end of the rim fixing part 144 adjoining the holder body 141. As explained above, the contact protrusion 144B is formed by cutting a portion of the holder body 141 into the shape of the first cutout 141A. The contact protrusion 144B is formed to increase the contact area between the rim fixing part 144 and the rim of the reflector 120. For this, the contact protrusion 144B extends from the holder body 141 in an opposite direction to the rim fixing part 144 but on the same plane as the rim fixing part 144.
The reinforcing ribs 146 reinforce the base fixing part 143, specifically, by supporting the holder body 141 with respect to the rim fixing part 144. That is, the reinforcing ribs 146 reinforce the base fixing part 143 by keeping the holder body 141 at a right angle with the rim fixing part 144. As explained above, the reinforcing ribs 146 are formed by cutting portions of the holder body 141 into the shape of the second cutouts 141B and bending end portions of the cut portions of the holder body 141 around the other end portions of the cut portions so that the end portions of the cut portions can be fixed to a surface of the rim fixing part 144. Therefore, as shown in
The heater supporting parts 147 are disposed at both side portions of the holder body 141, respectively. The heater supporting parts 147 support both end portions of the tube heater 130. In detail, the heater supporting parts 147 support both end portions of the tube 131 which adjoin the pinch parts 133. Each of the heater supporting parts 147 includes a heater receiving part 147A and a coupling rib 147B.
Both end portions of the tube 131 are placed in the heater receiving parts 147A, respectively. For this, the heater receiving parts 147A have a shape corresponding to the shape of both end portions of the tube 131. Substantially, the heater receiving parts 147A extend outward from both side portions of the holder body 141 in a width direction of the holder body 141 and are bent into a shape corresponding to a section of the tube 131 created by a plane cutting the tube 131 perpendicular to a longitudinal direction of the tube 131. Further, the heater receiving parts 147A are arranged at both side portions of the holder body 141 in the width direction of the holder body 141 in alignment with the coupling slots 141C. Furthermore, after the heater receiving parts 147A are bent as described above, leading ends of the heater receiving parts 147A are spaced a predetermined distance from a surface of the holder body 141 in a direction perpendicular to the surface of the holder body 141.
The coupling ribs 147B are formed on the leading ends of the heater receiving parts 147A. The coupling ribs 147B are bent from the leading ends of the heater receiving parts 147A at a predetermined angle and are inserted into the coupling slots 141C.
Referring again to
Referring to
In more detail, the first supporter 151 has an approximate ring shape. A plurality of contact protrusions 151A are provided on the inner circumference of the first supporter 151. The contact protrusions 151A, which are provided on the inner circumference of the first supporter 151, make a predetermined angle with each other about the center of the first supporter 151. The contact protrusions 151A protrude from the inner circumference of the first supporter 151 toward the center of the first supporter 151. An imaginary circle formed by peaks of the contact protrusions 151A has a diameter equal to or relatively larger than the outer diameter of the tube 131. Therefore, when the tube heater 130, that is, the tube 131, is inserted into the first supporter 151, the contact protrusions 151A make tight contact with the outer circumference of the tube 131. A fixing groove 151B is formed in the outer circumference of the first supporter 151. The fixing groove 151B is formed by recessing a portion of the outer circumference of the first supporter 151 along the circumference of the first supporter 151. The fixing groove 151B is configured to receive a supporter fixing part 155 (described later).
The first supporter 151 is formed of a heat resistant material. Since the first supporter 151 makes contact with the tube heater 130, the first supporter 151 is formed of a heat resistant material for preventing the first supporter 151 from being damaged by heat generated from the tube heater 130. For example, the first supporter 151 may be formed of a heat resistant material such as a ceramic or a material containing at least a ceramic.
The second supporter 153 may be formed of a material having predetermined rigidity and elasticity such as a metallic material. Thus, the second supporter 153 can elastically support the tube heater 130. The second supporter 153 includes the supporter fixing part 155 and a reflector fixing part 157.
The supporter fixing part 155 is inserted in the fixing groove 155B. The width and thickness of the supporter fixing part 155 may be corresponding to those of the fixing groove 155B. The supporter fixing part 155 has a closed curve or opened curve shape depending on whether both ends of the supporter fixing part 155 make contact with each other or are spaced apart from each other. In other words, when both ends of the supporter fixing part 155 are in contact with each other, the supporter fixing part 155 has a ring shape, that is, a closed curve shape corresponding to the shape of the fixing groove 151B. When both ends of the supporter fixing part 155 are spaced apart from each other, the supporter fixing part 155 has an opened shape. Both ends of the supporter fixing part 155 may be spaced apart from each other or brought into contact with each other when the supporter fixing part 155 is inserted into the fixing groove 151B.
The reflector fixing part 157 extends from both ends of the supporter fixing part 155. As both ends of the supporter fixing part 155 are brought into contact with each other or spaced apart from each other, mutually facing surfaces of the reflector fixing part 157 are also brought into contact with each other or spaced apart from each other. The reflector fixing part 157 extends from both ends of the supporter fixing part 155 at an oblique angle with a tangential line substantially passing through both ends of the supporter fixing part 155. The angle between the reflector fixing part 157 and the tangential line substantially passing through both ends of the supporter fixing part 155 may be determined by a position of the tube heater 130 inside the reflector 120, that is, a distance between the tube heater 130 and the surface of the reflector 120, so as to reflect heat generated by the tube heater 130 more efficiently.
Reflector penetration holes 157A are formed through mutually facing leading end portions of the reflector fixing part 157. A fastener is inserted through the reflector penetration holes 157A so as to fix the heater supporter 150 (i.e., the second supporter 153) to the reflector 120. The reflector penetration holes 157A communicate with each other. Furthermore, one of the first fasteners L1 for fixing the heater base 110 and the reflector 120 may be additionally inserted through the reflector penetration holes 157A so as to fix the heater supporter 150 to the reflector 120.
Exemplary operations of the heater supporter 150 and the electrode hob 1 including the heater supporter 150 will now be described according to the first embodiment.
When a user inputs an operation signal to the electrode hob 1, the heater assembly 100 is operated according to the operation signal. In detail, power is input to the tube heater 130, that is, the filament 135, and then heat is generated from the filament 135 owing to the electric resistance of the filament 135. The heat generated from the tube heater 130 is transferred to a container placed on the container seat 7 of the top plate 5 so that food contained in the container can be heated and cooked. At this time, the reflector 120 reflects heat generated from the tube heater 130 so that heat can be transferred from the tube heater 130 to the container more efficiently.
The tube heater 130 is fixed to the heater base 110 and the reflector 120 via the heater holder 140 and the heater supporter 150. The heater holder 140 is formed of a metallic material having predetermined elasticity, and the second supporter 153 of the heater supporter 150 is also formed of a metallic material. Therefore, although a force is applied to the heater assembly 100, the heater holder 140 and the heater supporter 150 absorb the force as they are elastically deformed, so that the tube heater 130 (that is, the tube 131) can be minimally damaged.
When power is applied to the tube heater 130, that is, the filament 135, heat is generated from the tube heater 130 as explained above. At this time, the temperature of the tube heater 130 is varied according to whether the tube heater 130 is placed inside or outside the reflector 120. That is, the temperature distribution of the tube heater 130 is not uniform according to whether heat generated from the tube heater 130 is reflected by the reflector 120. For example, the temperature of both end portions of the tube heater 130 placed outside the reflector 120 may increase up to about 350° C., and the temperature of the other portion of the tube heater 130 placed inside the reflector 120 may increase up to about 1000° C. due to heat reflected by the reflector 120.
Therefore, in the current embodiment, the first supporter 151 of the heater supporter 150, which substantially makes contact with a portion of the tube heater 130 placed inside the reflector 120, is formed of a heat resistant material. Thus, although the temperature of the portion of the tube heater 130 placed inside the reflector 120 is increased to about 1000° C., smoking and burning of the heater supporter 150 can be minimized, and devitrification behavior of a portion of the tube 131 that makes contact with the heater supporter 150 can be minimized. In addition, since such smoking, burning, and devitrification can be minimized, the durability of the heater assembly 100 increases, and heat can be transferred from the tube heater 130 to a container more efficiently.
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
In the above-described embodiments, the heater holder is fixed to the heater base, and the heater supporter is fixed to the reflector; however, the scope of the present disclosure is not limited thereto. That is, it may be sufficient that the heater holder and the heater supporter are fixed to any one of the heater supporter and the reflector so that the heater holder and the heater supporter can be used to fix the tube heater.
Furthermore, in the above-described embodiments, inert gas such as halogen gas may be filled in the tube to prevent oxidation of the filament while the filament generates heat.
Furthermore, the above-described embodiments may be applied to both the self-standing type electrode hob and the built-in type electric hob.
Moreover, in the above-described embodiment, the base fixing part is disposed on an inner surface of the heater base—that is, between the heater base and the reflector. However, the scope of the present disclosure is not limited thereto. For example, alternatively, the base fixing part may be fixed to an outer surface of the heater base.
And the A rib may be formed in one piece at the first supporter which has an approximate ring shape and is formed of a ceramic. And the second supporter, which is formed of a metallic material and is fixed at the reflector, is fixed at an end of the rib for fixing.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2008-0024235 | Mar 2008 | KR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/KR2009/001301 | 3/16/2009 | WO | 00 | 9/16/2010 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2009/116767 | 9/24/2009 | WO | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20110017722 A1 | Jan 2011 | US |
