CN1317222A - Heating resisting with angular heat deformation for kettle and associated control by dry process - Google Patents
Heating resisting with angular heat deformation for kettle and associated control by dry process Download PDFInfo
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- CN1317222A CN1317222A CN 99810767 CN99810767A CN1317222A CN 1317222 A CN1317222 A CN 1317222A CN 99810767 CN99810767 CN 99810767 CN 99810767 A CN99810767 A CN 99810767A CN 1317222 A CN1317222 A CN 1317222A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
- H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/78—Heating arrangements specially adapted for immersion heating
- H05B3/82—Fixedly-mounted immersion heaters
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Abstract
The invention concerns a heating coil resistor (1) comprising an internal resistive wire coated with magnesia and eccentric so as to cause an angular deformation of the resistor (1) when the latter heats. Said resistor is used in a device for detecting overheating in an electrical household appliance for heating liquid, comprising in particular a liquid reservoir within which is arranged the arc-shaped heating resistor (1) having two substantially parallel branches (1a,1b), the resistor having an angular heat deformation between its two branches capable, beyond a deformation threshold, of interrupting at least a connection between two contacts or between a resistor connector (2a) and a contact (22a) within the power circuit. The amplitude of the movement can be increased by a mechanical element (24). Advantageously, an inertia device (18) prevents the resistor (1) from being heated again when overheating has just occurred.
Description
Technical field
The present invention relates to water be carried out electrically heated technical field, particularly relate to the dry combustion method control of heating resistor by a device that boils water.
Background technology
As everyone knows, water is carried out aspect the electric heating, a control need be set and when anhydrous starting drive, stop device to the heating resistor power supply of device at the device that boils water with.Generally speaking, resistance this overheated is called dry combustion method usually, detects by a bimetal leaf with the heating resistor thermo-contact.Bimetal leaf can be forthright or hiding according to heating resistor, promptly below the bottom of water container and contact with heating resistor directly or indirectly.
As described in the patent application EP0524096, these bimetal leafs along with the overheated of heating resistor deforms, thereby can start a switch, to interrupt the power supply of heating resistor under the effect that the base temperature at its place raises.Therefore this device is to detect the overheated external mode of heating resistor.So they may break down, and produce very important manufacturing and installation cost.In addition, this device has certain inertia relevant with heat conduction.
In addition, people know that the physical phenomenon of utilizing material heat expansion makes the material elongation, thereby the contact of switch is disconnected.Therefore, document FR1084348 has described a flatiron of being made up of temperature-adjusting device, and temperature-adjusting device comprises two elements that thermal coefficient of expansion is different.The element that temperature coefficient is high is the chassis of flatiron.Element at the bottom of the temperature coefficient is a bar.During flatiron work, expand and bar moved in the chassis.Bar is connected with a heating control apparatus in addition.The motion of bar is transmitted and is amplified, to disconnect the electrical pickoff in the heating element power supply circuits.This method is applicable to a free area of heating surface, and as flatiron, it needs a big area of heating surface, so that it is bigger to expand.This method has limited the reactivity of this system.
Based on same principle, patent application GB2261770 has described a kind of device that interrupts powering to the heating resistor of liquid or electric gas heater with the hot linked rigid rod of heating resistor that passes through.Rigid rod extends along with the increase of temperature, thereby promotes a switch thin slice that disconnects the heating resistor power supply circuits.This method is more meaningful than the method for front in use, but shortcoming is to need intermediate expansion parts.
General introduction of the present invention
It is slow and the shortcoming of big inertia arranged to the objective of the invention is to overcome the detection system of prior-art devices.The power coefficient of heating resistor is high more, and reactive problem is important more.The length of heating resistor can be reduced and improve power coefficient, thereby manufacturing cost can be reduced.Therefore, power coefficient is higher than 30W/cm
2Heating resistor be of great value, and use.
When using the heating resistor of high power coefficient, for protective resistance and its environment, need be less than 10 seconds detection.Can not use traditional bimetal means in this time, because their reaction time is generally 15-20 second, this resistance to big load has actual danger.Need be provided with one and react checkout gear faster.
Therefore, purpose of the present invention is exactly the shortcoming that overcomes in the above-mentioned document, a kind of device of the overheated detection of household electrical appliance heating resistor of heating liquid is proposed, these household electrical appliance comprise a wet tank, one has the arc heating resistor of two branches to adorn wherein, the joint of branch end is positioned at beyond the wet tank, is connected at this contact point with power supply circuits.The manufacturing of arc resistance makes it produce angular heat deformation between two branches, distortion surpass a distortion limit just can disconnect between two contacts at least or resistance joint and power supply circuits in a contact between be connected.
This internal characteristics of resistance can improve the reliability that detects dry combustion method, and brings higher reactivity.
In addition, being connected between angular heat deformation interrupt activity end connector and its corresponding contacts, another joint is fixed.Therefore the angular distortion that this device can only have a resistance on a joint increased the motion amplitude of joint, is convenient to utilize this motion to interrupt electrical connection.
According to the present invention, in order to amplify two open motions of branch's angle of resistance described resistance when overheated, an intermediate mechanical part is connected between the branch and electrical pickoff of resistance, described motion disconnect between two contacts at least or resistance joint and power supply circuits in a contact between get in touch.Therefore the motion amplitude that causes this disconnection is guaranteed the disconnection of circuit.
According to first kind of economic embodiment, two equidirectional substantially branch physical connections of inter-access piece and resistance, described inter-access piece is connected in the contact that its sweep and at least one are inserted in the power supply circuits of resistance.
According to second embodiment, in order to amplify the motion that two thermal deformations between the branch produce, and be this motion to be added on the contact, with being connected of interruption and joint or corresponding contacts, a centre part is connected with one or two branch of resistance.These machine components can have various forms, the lever and the bar that adapt as the configuration of the amplifying device that can make motion.
According to this second embodiment, machine components are levers, a branch of the first arm of lever and resistance is at its joint mechanical connection, and second arm of lever is connected with a rigid rod, this rigid rod have one can closed heating resistor power supply circuits electrical pickoff.When heating resistor was overheated, this first lever amplified moving of resistance branch joint, and the electric contact of joint is left round about.This may be very big by joint and the contact mobile amplification of carrying out round about, according to the length of two arms of lever, may make the joint motion relevant amplify 2 to 5 times with the opening angle of two branches.
One of this apparatus features is very strong reactivity and invertibity.Under overheated situation, the advantage of the system that reaction is very fast is clearly.But its initial condition is got back in power supply very fast after the power supply of cutting off heating resistor.Therefore can begin a new heating cycle, and this moment, resistance was not also emitted all energy of gathering.This operation repeats several times continuously, and the gross energy that gathers may be enough to damage heating resistor.
Therefore, one of improvement of this basic device is exactly to prevent heating resistor recovery voltage immediately after once overheated by an inertia device.This device is at least with branch of resistance be arranged in a contact mechanical connection of the power supply circuits of described resistance.When heating resistor is overheated, described device is in unsteady state, make the power supply circuits of heating resistor can not be closed at place, the contact that is connected with the inertia device, but can closed again stable state at power supply circuits of getting back to heating resistor after making the time interval of heating resistor cooling.
According to this improved first modification, the inertia device is a bimetallic element of upset suddenly, this element one side and heating resistor hot link, on the other hand again with the heating resistor power supply circuits in an electrical pickoff mechanical connection, described bimetallic element is demarcated, so that when heating resistor is overheated, change curvature, and prevent heating resistor power supply circuits closure when obtaining curature variation.
This device can guarantee the safety of heat detecting device, because the temperature of bimetallic element reaction heating resistor.Carried out the demarcation of uniform temperature when making this element, from then on, it is only in this temperature, thereby is to get back to its initial condition under the effect of resistance temperature.Therefore, this device can only reheat resistance when the temperature of heating resistor is lower than a value, and this value can be determined by the selection of bimetallic element.
For bimetallic element is combined better with heating resistor, on the interface between heating resistor and the bimetallic element, adorned a copper sheathing again.
But, certainly, can with one faster and still very reliably device replace the inertia device of bimetallic element.In fact, need make the temperature of said system heating resistor drop to certain value before the power supply again.The time that this situation needs in advance and do not know.
Therefore can allow certain quantity of energy stores.Like this, the inertia device can be a temporary transient device, as an air telescopic cavity, and an electrical pickoff mechanical connection in the power supply circuits of its one side heating resistor, be connected with a lever on the other hand, lever itself is connected with an electric connection of heating resistor again.When heating resistor was overheated, described lever can be by the angular distortion compression telescopic cavity of described resistance, to disconnect the power supply circuits of heating resistor.Therefore, as long as telescopic cavity is not got back to its initial position, circuit just can not be closed.The parameter that can regulate is the time between heating resistor is powered for 2 times in succession.
According to this set, effective " death " time of inertia device can be regulated by the character of telescopic cavity, also can regulate by mechanical organ.In fact, if mechanical organ is a lever, just can amplify the angular movement of resistance, therefore regulate the compression height of telescopic cavity, thereby regulate the time that telescopic cavity is got back to its initial position, this lever moves on the length of each arm respectively, is connected with an electric connection on the one hand, is connected with telescopic cavity on the other hand.
According to a specific embodiments of device, a spring that has a postcritical in lever or the lever can keep this lever according to two settling positions.Lever has the 3rd arm that leads to the outside and the user is formed the heating resistor power supply or stops power supply in addition.This device can be saved Connection Element and functional unit.
According to the present invention, heating resistor has an internal resistance wire that is enclosed in the magnesium oxide, described resistance wire is in eccentric position in magnesium oxide, make to produce different thermal expansions when resistance is heated in this resistance, thereby cause two branches of resistance to produce angular distortion mutually.This special device is one of method of the heating resistor angle expansion that can obtain expecting.
According to another kind of embodiment of the present invention, a branch of resistance can not mechanical movement on the framework of the support of parts or kettle, and another branch is movably arranged in the backed stamper of a sealing.This device can concentrate on a unique contact point place to the disconnection of circuit, and the management of two movable breaker points is more heavy and trouble.
According to this last a kind of embodiment, the sealing backed stamper by neither heavy again easily the silicon materials of control make.
Description of drawings
Can understand the present invention better by means of the accompanying drawing that constitutes a non-limiting examples of the present invention, accompanying drawing is as follows:
-Fig. 1 a illustrates the heating resistor according to first embodiment of the invention, and this moment, kettle did not use;
-Fig. 1 b illustrates the resistance identical with last figure, and this moment, heating resistor was overheated;
-Fig. 2 illustrates along the profile of II among Fig. 3-II axle, is the thin portion of heating resistor joint in the second embodiment of the invention;
-Fig. 3 a-3f illustrates the work according to the dry combustion method checkout gear of second embodiment of the invention;
-Fig. 4 a-4d illustrates the work according to the dry combustion method checkout gear of third embodiment of the invention;
-Fig. 5 illustrates the 4th modification of the present invention;
-Fig. 6 illustrates a section along the heating resistor of VI among Fig. 1 a-VI axle.
Preferred implementation of the present invention
According to one of all modification that provide as an example common embodiment, resistance is arc.So-called " arc resistance " is meant that whole resistance has a formative radius at least, and opposite with straight line resistance.Therefore, it can be the simple U-shaped resistance that has only a formative radius, or more complicated dual U-shaped, spirality, curl shape ...
In order clearly to explain the present invention, the global shape of resistance shown here is a U-shaped, and the present invention is not limited to this a kind of execution mode.The more important that it may be noted that in addition is, the quantity of formative radius is many more, and the amplitude of angular distortion is also big more.
The resistance that uses is the resistance of a high load capacity, and power coefficient is greater than 30W/cm
2According to its manufacture, this resistance can have angular heat deformation, and promptly under the effect that temperature raises, two original parallel branches of resistance are disconnected from each other or close.This effect can obtain with diverse ways.
Heating resistor is made up of a pipe 15, comprises a spiral resistance wire 14 that is surrounded by magnesium oxide 13 in the pipe.One of effective ways that obtain this deformation characteristic are to make resistance wire 14 eccentric in pipe 15.Therefore, magnesium oxide 13 surrounds resistance wire 14 unevenly.When powering to resistance wire, it is asymmetric that the special arrangement of resistance wire 14 is heated magnesium oxide 13 and pipe 15, thus the different thermal expansion of generation amplitude.Cause the distortion of resistance 1 thus.For example when resistance 1 is converted into U-shaped, according to resistance wire 14 outside its shape or interior generation eccentric, its two 1a of branch, 1b are adjacent to each other or separate.Therefore, if resistance wire 14 is inwardly eccentric, when giving heating resistor 1 power supply, its two 1a of branch, 1b are disconnected from each other.This off-centre can be seen in Fig. 1 a and Fig. 6.
Therefore observing opening angle is 2.6 °.For a length is 110 millimeters branch, and this opening angle can obtain about 5 millimeters separation.Off-centre is big more, and this separation is also big more.
When the kettle operate as normal, when promptly water being arranged, resistance 1 is enough cold, and the motion of two branches is reduced greatly.Therefore observing, is 110 millimeters resistance for a branch length, and the relative displacement of branch was 2 millimeters (opening angle is 1.1 °) when water was arranged.In order to control the power supply interruption device of a heating resistor, it is operable having water and anhydrous minute deviation to be 3 millimeters.
The characteristics of this resistance are its very strong reactivities.In fact, under overheated situation, about 5 seconds, obtain maximum separation (about 5 millimeters), thereby satisfied an urgent demand of the fast detecting relevant with using high load capacity resistance.
For this angular distortion of controlling resistance 1 better, make a 1b of branch of resistance 1 motionless, therefore distortion is delivered on second 1a of branch of resistance 1.For this reason, shown in Fig. 1 a and 1b, a flat board 6 that guarantees the mechanical strength of heating component is inlaid on the 1b of branch of resistance 1, and the 1b of branch has the electric connection 2b that is inlaid on the splicing ear 12b.For example, this flat board 6 can be made by the rustless metal.Second 1a of branch of resistance 1 is movably arranged in the backed stamper of a silicon system, and this backed stamper guarantees that also resistance branch leads to the sealing at electric connection place, and the 1a of branch has and is inlaid in second electric connection 2a on the splicing ear 12a.
According to first kind of embodiment, heating resistor 1 has a deformable inter-access piece 10, and between two branches, when resistance when being cold, the core of described inter-access piece is crooked especially.When overheated, the active branch of resistance 1 is left, and makes the inter-access piece elongation.The core of its original bending has the trend of stretching.This set can convert the angle displacement of heating resistor to the linear displacement of easy utilization, has amplified the amplitude of motion simultaneously again.In fact, resistance opens 3 millimeters, and the center of inter-access piece can obtain 5 millimeters displacement.
This device can be used for many situations economically.But the reactive invertibity with it of this height of devices may produce cumulative function.In fact, if the resistance of resistance reaction and time of disconnecting power supply circuits are 5 seconds, then it also needs to come back in 5 seconds initial condition.Therefore, heating in per 5 seconds was possible in 5 seconds.
An improvement of this system is to avoid this possibility, because in 5 seconds of stopping to heat, heats in 5 seconds the time that the energy assembled does not distribute.Therefore once new heating can produce once new energy accumulating, is added on first energy accumulating.Because resistance temperature improves, the environment of the badly damaged heating resistor of possibility.For fear of this phenomenon, preferably forbid 2 continuous dry combustion methods.
Fig. 3 a illustrates second embodiment of the present invention, and this embodiment has a device that can interrupt heating resistor power supply under dry-fire condition, this device can with forbid repeatedly that continuously the device of dry combustion method matches.
The power supply interruption device of heating resistor comprises first lever 24, is hinged on around the rotating shaft 28 of lever 24.In this lever function that trunk snap burns therein two arms are arranged, lay respectively at the both sides of axle 28, the first arm 29 is positioned at joint 2a place, when resistance 1 thermal deformation, can be by joint 2a action, second arm 27 is vertical with first arm, is related with a power supply rigid rod 21 of heating resistor, the end points of rigid rod 21 is contact 22a, promptly with the tie point of the joint 2a of power supply circuits.Other direction beyond the position shown in second arm 27 can be positioned at, and do not exceed scope of the present invention, described device is an embodiment, in addition, lever 24 also comprises the 3rd arm 26, is positioned at first arm 29 from the extended line of axle 28, and leads to beyond the device frame.Therefore, as will be described below, arm 26 can be handled by the user, as the button that starts or stops heater.In an example shown, contact 22b forever is connected with the contact 2b of the 1b of branch of heating resistor 1.
The functional description of this device is as follows:
-kettle begins to stop, and arm 26 is in " OFF " position shown in Fig. 3 a.Edge 31 places of being processed into hypotenuse of this position in the support 17 of heating component stop.Spring 30 by a postcritical keeps the stable of this position.This spring makes lever 24 occupy two settling positions, and these two positions are respectively arm 26 at " OFF " shown in Fig. 3 a and the 3b and " ON ".The spring of this postcritical can have no to be positioned at distinctively on lever 34 or the lever 42.In " OFF " position, arm 27 applies a pressure on bar 21, makes contact 22a leave joint 2a.Therefore the power supply circuits of heating resistor disconnect.
-user holding arms 26 is pulled " ON " position shown in Fig. 3 b.Lever rotate counterclockwise the interaction of having eliminated between arm 27 and the bar 21, therefore make the power supply circuits closure of heating resistor by the contact between joint 2a and the contact 22a.Simultaneously, arm 29 contacts with joint 2a, gives arm 27 Motion Transmission of resistance 1 in this way.
-under the dry-fire condition shown in Fig. 3 c, the 1a of branch of heating resistor 1 distortion is left arm 1b in the soft seal area of for example being made by silicon 20.This moment, joint 2a left contact 22a.In addition, this distortion drives lever 24 by the interaction between joint 2a and the arm 29 and rotates to clockwise direction, causes arm 27 to lean against on the bar 21.The result makes contact 22a leave its initial position to the rightabout that moves with joint 2a.The resistance 1 that the length of arm 27 and its application point decision on bar 21 is communicated with contact 22a is to the amplification of the rightabout motion that is offset with resistance.Like this, can only be exaggerated in the disconnection of the contact at joint 2a place, because when joint 2a leaves contact 22a, the 22a opposite motion that has been excited in contact trends towards further leaving joint 2a.Therefore the user can correct anhydrously, and starts a normal heating cycle.
This device is further finished by a deferred mount of avoiding heating resistor to power immediately when dry combustion method takes place.This deferred mount comprises an element that changes superheat state, and this element has certain inertia to getting back to initial condition, forbids the power supply circuits closure of heating resistor during superheat state.
According to first kind of layout of this inertia device shown in Fig. 3 a-3f, the bimetal leaf 18 and heating resistor 1 thermo-contact of a upset suddenly.This contact can directly be based upon on resistance, or preferably is based upon a material that conductive coefficient is big, on the sleeve 16 that is made of such as copper.
Fig. 2 illustrates such device, and wherein copper sleeve 16 is arranged in the outer tube 15 of heating resistor 1.Can also see resistive heater 14 in the figure, carry electric connection 2a and with resistance wire 14 connection terminals 12a.
When dry combustion method (Fig. 3 c), the 1a of branch of resistance 1 leaves the 1b of branch, so contact 22a also separates to the rightabout of the 1a of branch from their initial position with ancon 23.Therefore, bimetal leaf 18 and ancon 23 leave part 19.Almost at synchronization, the bimetal leaf that is connected with the 1a of branch starts, i.e. the curature variation of the movable part of this element, and leave its settling position, if be provided with resistance 1, then movable part contacts with resistance 1 or conducting sleeve 16.Because the thermal inertia of bimetallic element 18, as long as resistance 1 is in high temperature, this element will be in the unstable position that movable part leaves the 1a of branch of resistance 1.Before the bimetal leaf passivation, the 1a of branch of resistance 1 will have the trend of getting back to its initial position.Therefore, the 1a of branch is stopped in the interactional process between the movable part of bimetal leaf 18 and resolution element 19.
Can establish an axle X-X herein along part 19 ' slip so that make resistance come back to its initial position, this has been avoided producing voltage on part 19.Therefore, shown in Fig. 3 e, resistance can not be powered when getting back to initial condition again, and circuit is disconnected by bimetallic element 18, thus bimetallic element 18 ancon 23 that can make bar 21 with separate, thereby separate with joint 2a.When resistance enough cooled off, bimetal leaf 18 came back to the settling position shown in Fig. 3 f, the movable part of bimetal leaf 18 again with the 1a of the branch thermo-contact of resistance 1.Then can power to resistance again.
Fig. 4 a-4d illustrates second device that can postpone once new power supply when heating resistor bears a dry combustion method.This device comprises a telescopic cavity 50, and its escape of air is through demarcating.The bottom of telescopic cavity 50 remains on the support 33 of heating component.Second lever 42 connects telescopic cavity by arm 44, and by the 1a of deformability branch of arm 49 connection heating resistors 1, two arms 42,44 are positioned at the both sides of the rotating shaft 48 of lever 42.The movable part of telescopic cavity 50 also has two different contact 32a, 41a by a rigid rod.Contact 32a can set up the electrical communication with joint 2a, and contact 41a can set up the electrical communication with the contact 41b of the power supply circuits that are connected resistance 1.In addition, the joint 2b of second of resistance 1 1b of the branch contact 32b of power supply circuits that keeps reclining forever.Therefore this circuit can be two local disconnections: at joint 2a place or contact 41a, 41b place.
The function of this device is as follows: when arm 36 is in " ON " shown in Fig. 4 b, to heating resistor power supply, contact 41a, 41b and 2a, 32a closure.When dry combustion method takes place (Fig. 4 c), the 1a of branch of heating resistor 1 separates with the 1b of branch, drives lever 42,34 and clockwise rotates around their rotating shafts separately.First lever 42 disconnects at joint 2a place and electrically contacting, and compresses telescopic cavity 50 simultaneously.Telescopic cavity 50 has contact 32a especially, and its initial position is left to the direction opposite with joint 2a in contact 32.
Simultaneously, contact 41a is compressed on the 41b of contact, makes bar 51 slight deformation that have contact 41b.In addition, the arm 37 of lever 34 also has the trend that makes bar 51 distortion, so that make contact 41b leave contact 41a.According to selected device, it is effective or invalid that arm 37 makes contact 41b break away from contact 41a.In a word, no longer power by disconnect power supply circuits at joint 2a place to resistance.
The 1a of branch of heating resistor returns very soon, and it is faster to get back to the used time of its home position than telescopic cavity.Telescopic cavity can be demarcated, and makes it get back to its settling position after resistance cools off the needed time.Contact 41a, 41b can be at the power supply circuits by independent disconnection heating resistor beyond the inertia device open circuit.
Fig. 5 illustrates a simplification modification of this device, and wherein lever 60 has two settling positions by spring 61.Lever 60 comprises second arm 68 that the first arm that a rotating shaft 64, one and joint 2a get in touch 66, and telescopic cavity 70 are got in touch and replaces 72,3 arm positions of the 3rd arm of startup/shutdown switch similar to the modification of front.A support 65 has previously described element, and can make resistance 1 have mechanical strength.
When dry combustion method, joint 2a breaks away from contact 62a, and contact 62a is supported by the bar 63 that is connected with telescopic cavity 70, and telescopic cavity under the turning effort of lever 60 by arm 68 compression, this so strengthened contact 62a away from.When keeping this position, spring 61 arrives its critical point.As long as the user is not put into switch " ON " position, telescopic cavity just can not change to the home position, thereby stops the closure of the power supply circuits of resistance 1.
An additional advantage of this device is its very big compactedness.This little volume can handle component make one can by an opening cylinder list be inserted into a single component in the kettle, also can save a large amount of time at the erection stage of kettle.
The possibility of commercial Application
The present invention is at the household electrical appliance of heating liquid, be applied such as the technical field of kettle.
Claims (16)
1. the arc heating resistor (1) of the household electrical appliance of heating liquid, it has two (1a of branch that are used for and want heated liquid to contact, 1b), it is characterized in that this resistance comprises an internal resistance wire (14) that is enclosed in the magnesium oxide, described resistance wire (14) is eccentric in magnesium oxide, make when resistance (1) heats, in resistance (1), produce different thermal expansions, cause two branches (1a, 1b) angular distortion between of resistance (1).
2. according to the resistance of claim 1, it is characterized in that it has the bending of more than one shaping.
3. the heating resistor of the household electrical appliance of heating liquid (1) crosses heat detecting device, this electrical equipment comprises a liquid container, placed one in the container two (1a of branch have been arranged, arc heating resistor 1b), (2a is 2b) at the end points place for their joint, be positioned at outside the liquid container, they here are connected with power supply circuits, it is characterized in that, arc resistance (1) is claim 1 or 2 described resistance.
4. according to the device of claim 3, it is characterized in that, getting in touch between the joint of angular heat deformation interrupt activity end and the corresponding contact, another joint is fixed.
5. according to the device of claim 3 or 4, it is characterized in that, an intermediate mechanical part (10) and resistance (the 1) (1a of branch, 1b) connect, so that when resistance 1 is overheated, amplify because two (1a of branch of described resistance (1), angular heat deformation 1b) and the motion that produces, described motion are interrupted between two contacts or joint of resistance and the contact between the contact in the power supply circuits.
6. according to the device of claim 5, it is characterized in that, machine components are that (described inter-access piece (10) is connected in the contact that its sweep and at least one are inserted in the resistance power supply circuits for 1a, the 1b) inter-access piece of physical connection (10) in a branch with two equidirectionals of resistance (1).
7. according to the device of claim 3, it is characterized in that a centre part (24,34,60) branch with resistance gets in touch, so that amplify the motion that produces owing to the angular heat deformation between two branches, and this motion is applied on the contact, with getting in touch of interruption and joint or corresponding contacts.
8. according to the device of claim 7, it is characterized in that machine components are levers (24,34,60), this lever (24,34,60) first arm (29,39,66) branch (1a) with resistance (1) has located mechanically contact at its joint (2a), second arm (27 of this lever (24,34,60), 37,68) connect with a rigid rod (21,51,63), this rigid rod have one can closed heating resistor (1) the electrical pickoff (22a of power supply circuits, 41b, 62a), when heating resistor (1) is overheated, described lever (24,34,60) displacement movement of the joint (2a) of the branch (1a) of amplification resistance (1) makes electrical pickoff (22a, 41b 62a) leaves joint (2a) round about.
9. according to the device of one of claim 3 to 8, it is characterized in that, an inertia device (18,50,70) at least at a branch (1a) of resistance (1) and contact (22a, a 32a of the power supply circuits of described resistance (1), mechanically contact is arranged 62a), when heating resistor (1) is overheated, described device (18,50,70) be in unsteady state, the power supply circuits of heating resistor (1) can not be at the contact (22a that connects with inertia device (18,50,70), 32a, 62a) locate closure, one can make the time interval of heating resistor (1) cooling after, described device is got back to the power supply circuits of heating resistor can closed again stable state.
10. according to the device of claim 9, it is characterized in that, the inertia device is a bimetallic element (18) of upset suddenly, this element has the heat contact with heating resistor (1) on the one hand, on the other hand with the power supply circuits that are added in heating resistor (1) in electrical pickoff (22a) mechanically contact is arranged, the power supply circuits closure of heating resistor (1) so that change curvature when heating resistor (1) is overheated, and can take place to stop through demarcating from this curvature changing in described bimetallic element (18).
11. the device according to claim 10 is characterized in that, places a copper sheathing on the interface between heating resistor (1) and the bimetallic element (18).
12. device according to claim 9, it is characterized in that, the inertia device is an air telescopic cavity (50,70), this telescopic cavity on the one hand with the heating resistor power supply circuits in an electrical pickoff (32a, 62a) mechanical connection, on the other hand with a lever (42,60) mechanical connection, lever itself are connected with (1) electric connection of heating resistor (2a) again, when heating resistor (1) is overheated, described lever (42,60) can pass through two branches (1a, 1b) the angular distortion compression telescopic cavity (50,70) of resistance (1), so that disconnect the power supply circuits of heating resistor (1), as long as telescopic cavity (50,70) is not got back to its home position, described circuit just can not be closed.
13. to one of 12 device, it is characterized in that at least one lever (24 according to Claim 8,34,42,60) have the spring (30 of a postcritical, 40,61), this spring can keep described lever (24 according to two settling positions, 34,42,60), this lever comprises also that in addition leads to outside the 3rd arm (26,36,72), for the user, the 3rd arm becomes beginning and stops the parts of the power supply of heating resistor (1).
14. the device according to one of claim 3 to 13 is characterized in that, a branch (1b) of heating resistor (1) is at the support (17 of assembly, 33,65) can not mechanical movement or on the framework of kettle, another branch (1a) is movably arranged in the sealing backed stamper (4,20).
15. the household electrical appliance of heating liquid have claim 1 or 2 described heating resistors (1).
16. the household electrical appliance of heating liquid, have one with the described heat detecting device of crossing of one of the heating resistor of wanting heated liquid to contact (1) and a claim 3 to 14.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR98/11453 | 1998-09-10 | ||
| FR9811453A FR2783391B1 (en) | 1998-09-10 | 1998-09-10 | ANGULAR THERMAL DEFORMATION HEATER RESISTANCE FOR KETTLE AND ASSOCIATED DRY HEATER CONTROL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1317222A true CN1317222A (en) | 2001-10-10 |
Family
ID=9530416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99810767 Pending CN1317222A (en) | 1998-09-10 | 1999-09-09 | Heating resisting with angular heat deformation for kettle and associated control by dry process |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1317222A (en) |
| AU (1) | AU5626699A (en) |
| FR (1) | FR2783391B1 (en) |
| WO (1) | WO2000016592A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103815794A (en) * | 2014-02-10 | 2014-05-28 | 李柏盛 | Electric rice cooker and switch mechanism thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB813461A (en) * | 1956-05-09 | 1959-05-13 | Morley Products Padiham Ltd | An improved cut-out arrangement for electrical heating apparatus |
| US3253124A (en) * | 1963-11-12 | 1966-05-24 | Gen Motors Corp | Domestic electric appliance |
| DE1957514A1 (en) * | 1969-11-15 | 1971-05-19 | Agfa Gevaert Ag | Thermostatically controlled heating device |
| DE3515131A1 (en) * | 1985-04-26 | 1986-10-30 | Licentia Gmbh | Protection device for preventing overheating of electrical domestic apparatuses |
| GB9322526D0 (en) * | 1993-11-02 | 1993-12-22 | Strix Ltd | Electrical heaters |
| JPH09320744A (en) * | 1996-05-28 | 1997-12-12 | Masao Uratani | Overheat prevention method of electric heater |
-
1998
- 1998-09-10 FR FR9811453A patent/FR2783391B1/en not_active Expired - Fee Related
-
1999
- 1999-09-09 WO PCT/FR1999/002143 patent/WO2000016592A1/en active Application Filing
- 1999-09-09 AU AU56266/99A patent/AU5626699A/en not_active Abandoned
- 1999-09-09 CN CN 99810767 patent/CN1317222A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103815794A (en) * | 2014-02-10 | 2014-05-28 | 李柏盛 | Electric rice cooker and switch mechanism thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000016592A1 (en) | 2000-03-23 |
| FR2783391B1 (en) | 2000-11-24 |
| FR2783391A1 (en) | 2000-03-17 |
| AU5626699A (en) | 2000-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |