CN1533733A - Electric rice pot - Google Patents
Electric rice pot Download PDFInfo
- Publication number
- CN1533733A CN1533733A CNA2004100318203A CN200410031820A CN1533733A CN 1533733 A CN1533733 A CN 1533733A CN A2004100318203 A CNA2004100318203 A CN A2004100318203A CN 200410031820 A CN200410031820 A CN 200410031820A CN 1533733 A CN1533733 A CN 1533733A
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- pot
- heater coil
- closed loop
- electric cooker
- loop wire
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- General Induction Heating (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
Provided is a small rice cooker in which a magnetic field to be leaked to the outer part of the rice cooker is effectively reduced. The rice cooker includes: a main body; a pot arranged so as to be freely removed from the main body; a pot heating part for heating the pot; a lid for covering the opening part of the pot; a steam belching port arranged on the bottom surface of the pot; a steam generating part having a freely removable vessel for generating steam inside the main body; a heating coil which is attached to the steam generating part, so as to induce and heat the vessel; and one or more conductive loop wires arranged outside of the heating coil. Since a current for generating the magnetic field to degauss the magnetic fields of and in the neighborhood of the loop wire is allowed to flow, the magnetic field to be leaked to the outside of the rice cooker is effectively reduced. Consequently, temperature of the main body or an object outside the main body is prevented from being raised.
Description
Technical field
The present invention relates to a kind of electric cooker that can use in special environment such as general family or dining rooms.
Background technology
In recent years, the electric cooker market that utilizes electromagnetic induction to heat constantly enlarges.The structure of traditional electric cooker as shown in Figure 3.Among Fig. 3,31 for upper surface is provided with pot body of opening, roughly is cylindric, covered by the lid 32 that opens and closes freely, and pot 33 is installed in the inside of pot body 31 in mounting or dismounting mode freely.In pot 33 make by magnetic materials such as stainless steel, iron.Pack into for interior pot 33 in the bearer bar 34, make, be the cylindric of the band end by nonmetallic materials.The bottom of bearer bar 34 and the outside are provided with the heater coil 35 that internal pot 33 carries out eddy-current heating.Heater coil 35 is made of interior loop 36 that is arranged on bearer bar 34 bottom outside and the exterior loop 37 that is arranged on its periphery wall.
In addition, the arranged outside of heater coil 35 has ferrite 38, and antimagnetic (promptly reducing the magnetic line of force that leaks into the electric cooker outside) carried out in the outside.39 temperature sensors for pot 33 temperature in measuring.40 is the control substrate to heater coil 35 supply high frequency power supplys.
41 is the anti-magnetic sheet of being made by conductive material (for example aluminium).Anti-magnetic sheet 41 is located at the periphery of heater coil 35.Can produce the eddy current of offsetting the magnetic field of passing anti-magnetic sheet 41 in the anti-magnetic sheet 41, therefore, anti-magnetic sheet 41 can play the effect that reduces the magnetic field (magnetic line of force) that leaks into the electric cooker outside, thereby can prevent that the magnetic line of force because of heater coil 35 from leaking into the part temperatures that the outside causes pot body 31 or be installed in pot body 31 outsides and raising (specifically can with reference to for example Japanese patent gazette special fair 4-36009 number).
But in the anti-magnetism method of existing eddy-current heating, owing to be provided with the anti-magnetic sheet of the very wide cylindric aluminum of width in inside, the size of pot body will become greatly for the interior pot of electric cooker, produce and will carry inconvenience, problems such as performance will worsen are set.In addition, also exist the situation that anti-magnetic sheet can not be set owing to the reasons such as size of the configuration of substrate and the body of stewing.And because of the kind of electric cooker and the difference of capacity, the shape of anti-magnetic sheet also will make corresponding changes, and anti-magnetic sheet can not be realized general.
Summary of the invention
The present invention is intended to address the above problem, and its purpose is to provide a kind of can effectively reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside, compact conformation, cheap electric cooker.
In order to address the above problem, be provided with in the electric cooker of the present invention: be used for sending steam in the body, the steam raising plant of mounting or dismounting container freely being housed to pot; To being installed in the heater coil that container in this steam raising plant carries out eddy-current heating; And 1 or the many closed loop wires of electric conductivity that the heater coil outside is set.
Like this, compare with the anti-magnetic sheet of aluminum of the prior art, closed loop wire only needs very little space just can be provided with.In existing electric cooker, volume is big, the anti-magnetic sheet of fixed in shape has caused very big restriction for the hull shape of pot body.In contrast, thin and soft closed loop wire is to the almost not restriction of the free degree of the hull shape of pot body.The magnetic field that the electric current that flows in closed loop wire produces can offset closed loop wire and near magnetic field.Be arranged on the correct position 1 or many closed loop wires and the anti-magnetic sheet of existing aluminum and almost have equal antimagnetic effect.Closed loop wire preferably is provided with many.
In addition, closed loop wire is meant the electric wire of the closed circuit that can form electric current.Closed loop wire is that at least one circle is arranged to for example concentric circles or spiral helicine electric wire.Closed loop wire both can use single cord, also can use the twisted line.Electric wire both can use bare wire, also can use covered wire.The closed loop wire that is arranged on the heater coil outside is meant, the vertical plane of heater coil is comprised in the vertical plane of external peripheral surface of closed loop wire.
Electric cooker described in the technical scheme 1 of the present invention comprises: pot body; Mounting or dismounting are located at the pot in described pot body freely; To described pot of pot heater that heats; Cover the lid of the peristome of described pot; Be located at the steam nozzle on the bottom surface of described lid; Be used for describedly sending into steam raising plant steam, that be provided with mounting or dismounting container freely in the body to pot; Be installed in heater coil on the described steam raising plant, that described container carried out eddy-current heating; And be arranged on the described heater coil outside, at least 1 closed loop wire of electric conductivity.Because closed loop wire and near magnetic field thereof can be offset in the magnetic field that produces when flowing through electric current in the closed loop wire, therefore can reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside effectively, suppress pot body or be located at the temperature rise of the parts of pot external body, thereby realize a kind of small-sized, low-cost, convenient in carrying and well behaved electric cooker is set.
Invention described in the technical scheme 2 is, in the invention described in the technical scheme 1, steam raising plant has the temperature sensor that the temperature to container detects, and temperature sensor signal line and closed loop wire that the output signal of described temperature sensor is sent on the control substrate are configured to mutually orthogonal.By making the almost orthogonal thereto setting of antimagnetic closed loop wire and temperature sensor signal line, can prevent that the magnetic field that takes place in the closed loop wire of magnetic from sealing in the temperature sensor signal line with the form of noise, so temperature sensor line noiseless, correct temperature sensor signal, thereby can realize a kind ofly can carrying out the electric cooker heater coil controlled after the high-precision test to vessel temp.
Invention described in the technical scheme 3 is, in the invention described in technical scheme 1 or 2, the outside of heater coil be provided be configured to the coiling direction of described heater coil roughly quadrature, by the ferrite member that at least 1 high magnetic permeability magnetic material is made, described at least 1 described closed loop wire is arranged near the upside the upper end of near the bottom of the outside of described ferrite member or described ferrite member downside or described ferrite member.Like this, magnetic field (magnetic line of force) concentrate on especially easily the few ferrite member of magnetic resistance around, will have bigger electric current to flow in the closed loop wire, can produce opposite magnetic field effectively in the closed loop wire, therefore can realize better antimagnetic effect.
Invention described in the technical scheme 4 is, in the invention described in each of technical scheme 1～3, what closed loop wire used is to be coated with the electric wire with stable on heating coating, can provide reliability high electric cooker like this.
Invention described in the technical scheme 5 is that in the invention described in the technical scheme 3, ferrite member is the shape that surrounds heater coil.Be shaped as the ferrite member that surrounds heater coil around, magnetic field (magnetic line of force) concentrated especially easily, the magnetic line of force that leaks into the outside of the ferrite member that surrounds heater coil will tail off, thereby can very excellent antimagnetic effect.
Invention described in the technical scheme 6 is that in the invention described in the technical scheme 5, described ferrite member is "] that surrounds heater coil " the shape ferrite.By referring to use a kind of ferrite shape, can cut down number of components, realize the generalization of parts.
Description of drawings
Fig. 1 is the schematic sectional view of the electric cooker in the embodiments of the invention 1,
Fig. 2 (a) is the schematic sectional view of the part-structure of the electric cooker in the embodiments of the invention 2,
The schematic, bottom view of the electric cooker in Fig. 2 (b) embodiments of the invention 2,
Fig. 3 is the schematic sectional view of existing electric cooker.
In the above-mentioned accompanying drawing, 1 is pot body, and 2 is pot, 3 are lid, and 4 is the pot heater, and 5 is steam nozzle, 6 is container, 7 is heater coil, and 8 is steam raising plant, and 9 is I font ferrite, 10 is closed loop wire, 11 is temperature sensor, and 14 is the temperature sensor signal line, and 21 is "] " the shape ferrite member.
The specific embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
(embodiment 1)
At first embodiments of the invention 1 are described by Fig. 1.Fig. 1 is the schematic sectional view of the electric cooker among the 1st embodiment of the present invention.
In Fig. 1, reference number 1 is electric cooker pot body, and pot 2 is installed in its inside in mounting or dismounting mode freely.The upper surface of pot 2 is covered by the lid 3 that opens and closes freely, and 4 pairs of mounting or dismounting of pot heater pot 2 freely heats.In addition, the bottom surface of lid 3 is provided with steam nozzle 5.Steam raising plant 8 is made by nonmetallic materials such as resins, is the cylindric of the band end, packs into wherein for container 6.The outside of steam raising plant 8 is provided with the heater coil 7 that container 6 is carried out eddy-current heating, and the high frequency electric that heater coil 7 is supplied with high frequency electric source becomes alternating magnetic field, by alternating magnetic field container 6 is carried out eddy-current heating.
I font ferrite member 9 ferrite member that magnetic material with high magnetic permeability is made of serving as reasons is arranged near the outside of heater coil 7 with the coiling direction of heater coil 7 almost orthogonal theretoly, is provided with 2 altogether, is the diagonal angle configuration.I font ferrite 9 can prevent magnetic field that heater coil 7 produces to pot body 1 external leaks, also plays the effect of the eddy-current heating that promotion carries out container 6 simultaneously.
The situation that is provided with of closed loop wire 10 is: be concentric circles and be provided with and be 2 closed loop wires 10 that electric wire is closed in a trap respectively near the outside of I font ferrite 9; Upper and lower at heater coil 7 is provided with 2 closed loop wires with also being concentric circles, and these 2 closed loop wires also are respectively a trap and close electric wire.
Closed loop wire 10 has electric conductivity, use be to have stable on heating copper cash, and have and can prevent the injured coating in surface (for instance, can adopt glass marshalling fluorine line).Closed loop wire 10 adopts the reason with stable on heating covered wire to be because the temperature of container 6 can be above 100 ℃ in heating process.
Be admitted in the control substrate 13 from the output of temperature sensor 11 and from the input signal of operating the substrate (not shown), be provided for producing the high frequency electric of alternating magnetic field by control substrate 13 to heater coil 7.In addition, control substrate 13 is provided with high frequency electric source, provides high frequency electric by making the power semiconductor component generation conduction and cut-off such as IGBT that are located between high frequency electric source and the heater coil 7 to heater coil, with the power of switching frequency control supply.
The following describes the operational circumstances of electric cooker with said structure.At first, will cook rice and with the corresponding water of rice amount put into the pot 2, then with pot 2 with the regulation attitude pack into pot body 1 in; After adding the water of ormal weight in the container 6 in being located at pot body 1 again, the user operates the switch (not shown) of cooking, and promptly begins to cook.In the process of cooking, the program of cooking that is set in advance in the micro computer on the control substrate 13 drives pot heater 4 according to the temperature of pot that is the output of temperature sensor 11, that is sends into the high frequency electric that is used to produce alternating magnetic field in heater coil 7.Like this, will there be alternating magnetic field to take place in the heater coil 7, will has eddy current to take place in the container 6.Eddy current can produce Jiao Erre, and container 6 is carried out eddy-current heating, produces steam, is sprayed onto on the upper surface of rice the pot 2 from steam nozzle 5.Like this, pot water of 2 inside and rice grain pattern are crossed pot heater 4 and are carried out heating from the bottom of pot 2, and (water and the rice) on top then is heated/is cooked by the steam that is sprayed onto in the pot 2.
Adopt the words of aforesaid present embodiment, to there be the electric current that produces by the magnetic line of force that leaks into heater coil 7 outsides to take place to flow in the closed loop wire 10, the magnetic field that these electric currents produce will balance out in the closed loop wire 10 and near magnetic field, thereby the magnetic line of force that leaks into heater coil 7 outsides is reduced.Therefore, the magnetic field (magnetic line of force) that leaks into the electric cooker outside can reduce effectively, and the part temperatures on pot body 11 or pot body 11 outsides rises and can suppress, thereby realizes a kind of small-sized, cheap, convenient in carrying, the electric cooker that setting property is good.
In addition, in the above-described embodiments, be configured to and closed loop wire 10 quadratures owing to be used for that the output signal of temperature sensor 11 is sent to the temperature sensor signal line 12 of control on the substrate 13, the magnetic field that therefore can prevent closed loop wire 10 generations seals in the holding wire 12 of temperature sensor with the form of noise.Like this, temperature sensor signal line 12 can be sent out the signal of temperature sensor 11 correct, that noise is few, thereby realizes a kind of electric cooker that can control with the temperature of very high accuracy detection container 6, to heater coil 7.
In addition, also be provided with in the present embodiment with respect to the coiling direction of heater coil 7 and be arranged to and its ferrite member of quadrature basically, the outside of these ferrite member is provided with closed loop wire 10 again.So, concentrate especially easily at the less ferrite member surrounding magnetic field (magnetic line of force) of magnetic resistance.When flowing through bigger electric current in the closed loop wire 10, can produce opposite magnetic field effectively in the closed loop wire 10, thereby can realize bigger antimagnetic effect.
In addition,, and have the coating that prevents that the surface is injured, therefore can realize the electric cooker that reliability is high because the closed loop wire 10 in the present embodiment has hear resistance.
In addition, since the closed loop wire 10 in the present embodiment be set at I font ferrite 9 the bottom neighbouring (downside) or be arranged on neighbouring (upside) of the upper end of ferrite portion, that is closed loop wire 10 is set near the inlet or outlet of the I font ferrite 9 that the magnetic line of force passes through, therefore, magnetic field (magnetic line of force) will further concentrate on magnetic resistance less I font ferrite 9 around, when flowing through big electric current in the closed loop wire 10, the magnetic field of generation can balance out closed loop wire 10 and near field pole the earth thereof.Like this, the magnetic line of force that leaks into the outside of heater coil 7 will further reduce.
In addition, though just be in the present embodiment and be provided with 2 ferrite member diagonally, but, if 3 or more words are set, magnetic field (magnetic line of force) will more can concentrate on around the ferrite member, more can balance out closed loop wire 10 with near the magnetic field it, thereby can reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside effectively.In addition, if, can more effectively reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside be arranged to the to be separated by angle of approximate equality of the ferrite member more than 2.
(embodiment 2)
Below with reference to Fig. 2 the 2nd embodiment of the present invention is described.
Fig. 2 is the schematic sectional view of electric cooker part-structure.Present embodiment is substantially the same with embodiment 1, and be with the difference of embodiment 1: heater coil 7 is by being "] " ferrite 21 of shape surrounds.Wherein, should "] " end face 21 (a), 21 (b) that point to steam raising plant 8 one sides in the shape ferrite 21 are configured to center 7 (a) than the electric wire in the heater coil also near steam raising plant 8.
The experiment situation of the effect of checking the present invention the 2nd embodiment is described below, the purpose of this experiment be will make by Ferrite Material, surround "] of heater coil 7 " when shape ferrite 21 changes the I font ferrite that does not surround heater coil 7 into, verify the variation of its antimagnetic effect.Close the position of heater coil 7 and ferrite member, is at 2.0mm place, the outside of heater coil 7 horn shape is provided with 2 ferrite member.Closed loop wire 10 uses linear 1.25mm
2Copper cash, be located at the 1.0mm place, the outside of ferrite member, respectively be provided with 1 at upper and lower, be provided with 2 altogether.
Then, energising in heater coil 7, the maximum of mensuration density of line of magnetic force on the position of distance electric cooker pot body 10cm.The value of density of line of magnetic force is more little, shows that then the magnetic field from electric cooker pot body leaks out is few more.
Under the ferritic occasion of I font, density of line of magnetic force is 6.2Mt; "] " under the occasion of shape ferrite 21, density of line of magnetic force then reduces to 4.4 μ T.Experiment shows, with "] " shape ferrite 21 words that surround heater coil 7 have more effective antimagnetic effect.
In the above embodiments, because "] " shape ferrite 21 is configured to center than heater wire astragal more near steam raising plant 8 directions near the face of steam raising plant 8 one sides, therefore, the most magnetic line of force flows the direction shown in the thick-line arrow A among Fig. 2, seldom can leak into and surround heater coil 7 "] " outside of shape ferrite 21, have very excellent antimagnetic effect, can further promote the eddy-current heating that container 6 is carried out.
Though only be provided with 2 closed loop wires 10 in the present embodiment, if but be provided with 3, the electric current of Liu Donging is further offset near closed loop wire 10 and the closed loop wire 10 magnetic field with the magnetic field energy that produces therein, thereby reduce the magnetic line of force in the outside that leaks into heater coil 7, thereby can reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside effectively.In addition, if closed loop wire 10 more than 3 equally spaced is set, can more effectively reduce the magnetic field (magnetic line of force) that leaks into the electric cooker outside.
In addition, be arranged to "] though surround the ferritic shape of heater coil in the present embodiment " shape, in fact, as long as can surround heater coil, these ferrite member adopt other shapes also to be fine.
In addition, though in the present embodiment, that closed loop wire 10 uses is the linear 1.25mm that is
2Copper cash, still, in fact also be hard-core for linear size.In addition,, can flow through bigger electric current in the closed loop wire, thereby realize better antimagnetic effect if increase the basal area of closed loop wire.In addition, in configuration during closed loop wire, many closed loop wires are set on same position, constitute wire harness and also be fine.
In addition, antimagnetic for the magnetic field on the bottom surface of container 6 is carried out, can also near the direction of the bottom surface of container 6, closed loop wire be set, can further strengthen antimagnetic effect like this.
In sum, adopt words of the present invention, can reduce the magnetic field (magnetic line of force) of leaking the electric cooker outside effectively, thereby the temperature that can suppress to stew body or be positioned at the parts of pot external body rises, realize a kind of small-sized, low-cost, carry easily, electric cooker that setting property is good.
Claims (6)
1. electric cooker is characterized in that comprising:
Pot body;
Mounting or dismounting are located at the pot in described pot body freely;
To described pot of pot heater that heats;
Cover the lid of the peristome of described pot;
Be located at the steam nozzle on the bottom surface of described lid;
Be used for describedly sending into steam raising plant steam, that be provided with mounting or dismounting container freely in the body to pot;
Be installed in heater coil on the described steam raising plant, that described container carried out eddy-current heating; And
Be arranged on the described heater coil outside, at least 1 closed loop wire of electric conductivity.
2. the electric cooker described in claim 1, it is characterized in that: steam raising plant has the temperature sensor that the temperature to container detects, and temperature sensor signal line and closed loop wire that the output signal of described temperature sensor is sent on the control substrate are configured to mutually orthogonal.
3. the electric cooker described in claim 1 or 2 is characterized in that: the outside of heater coil is provided with and is configured to and the coiling direction of described heater coil roughly quadrature, the ferrite member made by at least 1 high magnetic permeability magnetic material,
Described at least 1 described closed loop wire is arranged near the upside the upper end of near the bottom of the outside of described ferrite member or described ferrite member downside or described ferrite member.
4. the electric cooker described in each of claim 1～3 is characterized in that: be coated with on the described closed loop wire and have stable on heating coating.
5. the electric cooker described in claim 3, it is characterized in that: described ferrite member is the shape that surrounds heater coil.
6. the electric cooker described in claim 5, it is characterized in that: described ferrite member is "] that surrounds heater coil " the shape ferrite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003094941A JP3985711B2 (en) | 2003-03-31 | 2003-03-31 | rice cooker |
| JP2003094941 | 2003-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1533733A true CN1533733A (en) | 2004-10-06 |
| CN1231171C CN1231171C (en) | 2005-12-14 |
Family
ID=33407389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410031820 Expired - Fee Related CN1231171C (en) | 2003-03-31 | 2004-03-30 | Electric rice pot |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3985711B2 (en) |
| CN (1) | CN1231171C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102613878A (en) * | 2012-03-29 | 2012-08-01 | 九阳股份有限公司 | Electromagnetic heating kettle with high electromagnetic compatibility |
| WO2018205529A1 (en) * | 2017-05-12 | 2018-11-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance |
| CN109744852A (en) * | 2019-01-17 | 2019-05-14 | 宁波城市职业技术学院 | A kind of electric cooker that steam is circular |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5318401U (en) * | 1976-07-27 | 1978-02-16 | ||
| JPS5524074A (en) * | 1978-08-11 | 1980-02-20 | Matsushita Electric Ind Co Ltd | Heat insulating instrument |
| JPH08266401A (en) * | 1995-03-31 | 1996-10-15 | Matsushita Electric Ind Co Ltd | Induction heating rice cooker |
-
2003
- 2003-03-31 JP JP2003094941A patent/JP3985711B2/en not_active Expired - Fee Related
-
2004
- 2004-03-30 CN CN 200410031820 patent/CN1231171C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102613878A (en) * | 2012-03-29 | 2012-08-01 | 九阳股份有限公司 | Electromagnetic heating kettle with high electromagnetic compatibility |
| CN102613878B (en) * | 2012-03-29 | 2015-04-29 | 九阳股份有限公司 | Electromagnetic heating kettle with high electromagnetic compatibility |
| WO2018205529A1 (en) * | 2017-05-12 | 2018-11-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance |
| CN109744852A (en) * | 2019-01-17 | 2019-05-14 | 宁波城市职业技术学院 | A kind of electric cooker that steam is circular |
| CN109744852B (en) * | 2019-01-17 | 2024-02-20 | 宁波城市职业技术学院 | Steam-encircling electric cooker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1231171C (en) | 2005-12-14 |
| JP3985711B2 (en) | 2007-10-03 |
| JP2004298402A (en) | 2004-10-28 |
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Granted publication date: 20051214 Termination date: 20190330 |
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| CF01 | Termination of patent right due to non-payment of annual fee |