CN1148999C - Electric heaters - Google Patents

Abstract

An integrated heater and control assembly comprises an electric heater (200) having a resistive heating track provided on an insulating substrate and a thermally sensitive control for the heater built onto the heater. In particular, supports for trip levers are bonded to the substrate. Trip lever is operated both by a boiling sensitive actuator (234) and an overheat protection actuator (268) while trip lever (212b) is acted on by the actuator (268) alone. Both trip levers (230a, 230b) are also acted on by bobweights (250a, 250b) which are responsive to movement of the vessel to switch the heater on. Power connection terminals and a mounting flange are also mounted directly onto the heater.

Description

Electric heater

Technical field

The present invention relates to a kind of electric heater, relate in particular to the heater that is used for liquid heating, for example jar, kettle, coffee machine, shower, steam generator etc.The invention still further relates to the heater (" thick film heater ") that comprises thick-film heating element.

Background technology

British patent GB-A-2290210 has described some examples of thick film heater, and they generally include a flat substantially dielectric base, generally is ceramic disk or the form that has the metal dish that applies dielectric base thereon.Insulating barrier generally is glass, glass ceramics or pottery (briefly being called pottery hereinafter).Article one, resistance-type heating track setting (for example printed) is on dielectric base, and in use this track has electric current, thereby makes this track heating.Usually on track, cover the glaze that covers of one deck protectiveness again, and be provided with the hole in position, for example so that allow near this track for the purpose that is electrically connected with this track.

Thick film heater can be the part of a liquid wall, especially can become the part of the substrate or the substrate of heating vessel, normally be provided with like this in heating vessel: resistance-type heating track is positioned at the minimum position of used container.

Be generally electric heater and be furnished with an overheat protector; this protector disconnects heater in overheated heater, and this may occur under following situation: if heater water in lack of water or the container in heating vessel is still being led to electricity (" dry combustion method ") by heater under the situation of evaporate to dryness.The example of such control method is disclosed in WO 95/34187.

Except overheat protector, especially in heating vessel, be typically provided with a temperature regulation controller, this controller for example disconnects heater or the temperature of liquid in containers is remained on a suitable temperature when the liquid boiling in the container time.

In known control, functional unit is installed on the position that a quilt in the molded plastic housing determines exactly, shell is installed on the heater, like this, in the last assembling of this device, the temperature sense parts of controller and the parts that also may have an electric current just can be bonded on the position suitable on the heater.For example, heater and controller are installed on the main body of heating vessel usually.Must will certainly be very high by the working temperature that plastic mould bears, especially under out of order situation, all the more so.This has just limited the selection of Available Material, and those materials that are adapted at working under the necessary temperature all are very expensive.In addition, this moulded parts needs design carefully so that keep the operational tolerance of various different control assemblies in the above under the working temperature of being discussed.Therefore in order to obtain needed accuracy when allowing the plastic mould thermal expansion, the design of this moulded parts is very high to specification requirement, needs the such complex technology of molded flow analysis.Such design technology is expensive.

Summary of the invention

The objective of the invention is to seek provides a kind of heater assembly to having the improvement of heater design now, and this heater does not have above-mentioned shortcoming and is easy to design and manufacturing.

Therefore, first aspect of the present invention provides a kind of heater, and this device comprises:

An electric heater, it has and is arranged on a resistance-type heating track on the dielectric base;

A supporting member is used for the functional unit and the heater of the controller of heater are linked together.

Therefore according to the present invention, the support unit that is used for the controller function parts is connected with heater, thereby and the functional unit of controller can be installed on the supporting member rather than on the plastics controller housing.This has just simplified the factor that will consider in design of Controller largely, and provides the supporting member of parts by employing heater itself, has exempted the needs to the molding outer casing of the functional unit that is used to install various controllers effectively.

Therefore taking it by and large, the invention provides a kind of heater and control assembly of comprehensive Design, it comprises: an electric heater, and it has and is arranged on a resistance-type heating track on the dielectric base; A thermally-responsive controls that is used for heater, each parts of this controller are installed on the heater and by heater and directly support.

The operation control member be such as being an actuator, the movable member of a bimetal leaf actuator or a controller for example, and for example trip(ping) bar or similarity piece, this will be further described below.

Best, support unit and/or control assembly available metal are made, and in the case, these parts can adopt the stress metal method for processing accurately also easily to create.Metal parts can under the temperature higher, operate than plastic material and production cost littler.When adopting metal carrier, parts can be arranged on the part of an insulation of substrate, can not only make heating track and base material insulation like this and can make the heating track and control assembly insulate.Therefore this heater provides before physical support and the electric insulation by controller housing provided.

Support unit can adopt epoxy resin or other suitable method by soft soldering, hard solder or bonding being connected on the heater.The material that is adopted is somewhat dependent upon heater temperature in actual applications and bonds to the fusing point of the material on the heater.The method for optimizing that connects is considered the factor of cost, easy and speed aspect, if the working temperature that heater is expected is not too high, and preferably soft soldering.Therefore scolder is Pb, Sn and Zn alloy normally, and these alloys melt between 170 ℃ and 350 ℃, if the heter temperature fusing point (even under failure condition) that can not arrive scolder just can adopt soft soldering.At insulator with the heating track is printed and by the position that solder printing can be expected to the heater after burning till, and each parts is arranged on the scolder, then heater is sent in the stove to allow solder fusing by proper device.After cooling, each parts just has been fixed.

Adopt hard solder or soft soldering as method of attachment, at this novelty and progressive are arranged on the one hand, therefore from further aspect, the invention provides a kind of method of making the thick film electric heater, it comprises: slicken solder (solder) or hard solder (braze material) are set on the position suitable on the heater, being installed to positioning parts on the heater on the material of described setting and heating, then with solder solidification so that parts are fixed.When adopting soldering when connecting technology, with the preferably silver-colored ink coats of layer of metal printing ink and burn till on the heater will the zone of coated scolder on, this is considered to very beneficial.This is especially like this, and when slicken solder being coated on a kind of insulating material, for example on the ceramic layer of heater, the metal ink layer has been just for scolder provides intermediary like this, otherwise scolder just can successfully not bond on the ceramic layer.This layer material can apply when connection pads or other silver-colored parts are printed on the heater.

The material of heater itself can be used as the connection medium.Therefore, support unit can be connected on the heater with pottery.Thereby in a kind of manufacture method, support unit can be set at ceramic layer (for example a kind of glazed layer) before the Low fire ceramic layer, burnt till at the pottery that forms connection between support unit and the heater and can carry out when this layer itself burnt till.

Support unit is connected to that the part of heater can be punched, reaming or handle with increase and offer the surface area that connects medium.

The supporting member that is used for control assembly can be the part of these parts itself, for example leaf spring end.Yet, preferably supporting member is provided with an installation site that is used for control assembly, control assembly just can be installed on the supporting member in any suitable manner directly or indirectly, for example by a button on the connector, but preferably it is to be installed in rotation on the there by a rotating shaft on supporting member, and this rotating shaft can be at least one and the form of the tooth of the edge of a knife engagement that is used for being provided with on work or movable member.

Support unit also can have a recoil position that is used for spring assembly, is provided with to be used for making direction or the position deviation of control device an expectation.Spring assembly can, for example be provided with separately so that control assembly towards the heater deviation in driction, spring assembly preferably is provided with a bistable state eccentric stiffener, is used to make control assembly not only towards heater deviation in driction but also can be away from the heater deviation in driction.For this end, elastomeric element can be a kind of C shape spring or a kind of Ω shape spring, is installed between the control assembly of support unit.Thereby control assembly can be a kind of elasticity trip(ping) bar, is used for opening a series of switch contacts in controller according to the operation of heat-sensitive actuating device.

Therefore, control assembly preferably is arranged to work so that open a series of switch contacts in the electricity supply of heater with the heat-sensitive actuating device.Control assembly can the supporting hot sensitive actuator, but the heat-sensitive actuating device preferably is installed on the heater individually, and control assembly departed to engage with the heat-sensitive actuating device, is when switch contact is pent at least.The heat-sensitive actuating device is the double-metal sheet type actuator preferably, and quick-action double-metal sheet type actuator is better, for example disclosed type in GB1542252.

Therein among embodiment, the heat-sensitive actuating device can be provided as an overheat protector with the heater thermo-contact, and it will be started working under the situation of overheated heater so that switch contact is opened and interrupted electric current supply to heater like this.

In another embodiment, the heat-sensitive actuating device can be set to liquid in container and arrive under the situation of a predetermined temperature and carry out work, especially during the liquid boiling in container.Heat-sensitive actuating device like this can be arranged to the outlet of passage, and this passage exports on the actuator steam of boiling liquid so that actuator work when liquid boiling.Yet in a kind of setting the like this, the import of passage must be located at towards the direction of container top so that receive the steam of boiling liquid, and makes the complicated integral structureization of container like this.Therefore, in disclosed a kind of preferred embodiment in WO 97/04694, heater is provided with a deep gouge, and this deep gouge can be located at inside the heater and without any need for outside steam jockey.Therefore, in a kind of therein the setting, heat-sensitive actuating device and deep gouge carry out thermo-contact, and actuator is started working when liquid in containers arrives a predetermined temperature like this.Be more preferably, this deep gouge is to receive on the heater by above-mentioned a kind of technical battery, if method like this is not considered others of the present invention, it is that novelty and creationary is arranged.Therefore, from aspect further, the invention provides a kind of heater with a deep gouge, this deep gouge is by a kind of being connected on the heater in the said method.

In a preferred embodiment; heater assembly is provided with two heat-sensitive actuating devices; one of them actuator is set to an overheat protector that contacts with heater; like this when heater arrives a temperature when expressing failure condition; this actuator is started working, especially during the liquid boiling in container.These two actuators can be worked with a unidirectional movable control assembly, so that switch contact the time is opened in an actuator in office work.Yet, being preferably each actuator control corresponding parts are set, control assembly just can interrelate with the beginning contact of respective series like this.In this case, each control assembly can be installed on same support unit, or on corresponding independently support unit.

Control assembly (or each) can be made as and open switch contact indirectly, for example by acting on the elastomeric element that at least one switch contact is installed.Yet preferably control assembly has at least one switch contact, and is more preferably directly is provided with at least one coefficient switch contact on heater surfaces, for example is attached thereto.Best, the heater button contact is to be connected on the end of heater traces with a kind of suitable manner, thereby has just avoided and need install individually and be electrically connected heater traces.Therein among embodiment, on heater surfaces, be provided with two switch contacts, each switch contact terminates on the heater on the independent path, and movable member has the bridge-type parts with two complementary switch contacts, being provided with like this is that switch contact is contacted with heater, thereby the bridge-type parts can be electrically connected with independent path.Preferably be provided with according to this, the connected path of all is set on the heater surfaces, and therefore just there is no need to connect for one of them switch contact provides a path with other lead or leaf spring.This has just been avoided and need carry out once auxiliary fixing operation to insulating barrier, thereby helps preventing the injury to this insulating barrier.It has also simplified the electricity setting of heater assembly greatly, and itself is to be considered to have novelty and inventive device, and this is more fully to use than above-mentioned special device.

Therefore,, the invention provides a kind of heater assembly, comprising from an aspect further:

An electric heater is provided with a resistance-type heating track on its dielectric base;

Be provided with two switch contacts on heater surfaces, each switch contact terminates on the independent path on the heater;

The electricity of two complementary switch contacts of an insulation is led bridge, this lead bridge be mounted to can towards and away from heater-movement, thereby can optionally shunt, and be electrically connected or open circuit between the path with corresponding path separately to the switch contact on the heater.

From an aspect further, the invention provides a kind of heater assembly, comprising:

An electric heater has a resistance-type heating track that is located on the dielectric base, and above-mentioned resistance-type track has a fixing electrical connection that links to each other with power supply in its respective end portions;

The breaker device of a described heating track has the switch contact that is located at each side of breaker device;

An electricity is led bridge, and optionally mobile being meshed with described switch contact and separate so that switched on described track or outage.

This is led bridge and can lead Biodge device and realize by install one on a movable carriage, preferably a rotatable installation bracket.In a preferred embodiment, movable carriage is above-mentioned movable control assembly, and it is installed on the supporting member that links together with heater.Lead bridge spare and preferably be mounted to contact pressure equilibrium between the switch contact that can make respective series.Therefore, this is led bridge spare and preferably is mounted to its carriage swing relatively.

Carriage can be made of a kind of conductor, as a kind of metal material.In this case, when the bridge-type parts linked to each other with conductive path, electric current just can be introduced into carriage by the bridge-type parts, make it to form an electric connection, for example a thin slice joint is used for supply of current and gives a device indicating, as a neon glim lamp or a light-emitting diode (LED).Certainly, when the bridge-type parts linked to each other with conductive path, the joint on the carriage can be used for the part that supply of current is given any needs of liquid heating container.Adopt such setting, just can avoid and to be equipped with additional electric connector and similarity piece for indicating device.

The heater button contact can be sheet metal or be coated with metal such as silver on dielectric base.Yet preferably switch contact is discrete switch contact, for example is silver-colored switch contact, is connected on the end sections of track.

The conductive path of top indication can be located at a kind of form of conductive traces on (as being printed on) heater.This conductive path can be that a kind of resistance-type heating material or a kind of low electrical resistant material are for example silver-colored as an Ampereconductors.In a preferred device, article one, low resistance conduction path is led to its switch contact and other conductive path from a principal current supply position and is led to or be formed up to the resistance heating track of small part from its switch contact, and the electric current supply that the rise of bridge-type parts will be heated track disconnects.

In a specific preferred structure, be connected with the joint of a main electric connector on the heater at least.Therefore, the conductive traces of guiding to a switch contact or guiding to the resistance heating track from a joint of main connector can be arranged on the heater, for example, do not need lead, reed or link other conducting element on the heater from main connector, necessity is not connected to those connectors on the heater then.This just represents economical with materials significantly.In addition, this heater is provided with a mechanical bearings that is used for main connector, thereby needing just to avoid plastic mould, and this moulded parts is commonly used to provide mechanical support for the main connector joint.

So, therefore it is to be noted that here this structure itself is that novelty and creationary is arranged, and from aspect further, the invention provides a kind of heater assembly, comprising:

An electric heater has an electric heating track in its substrate;

Piecing devices that are connected the external power supply connector on the heater.

If the substrate of heater in container be fully with fluid insulation, so only need two major joints, as lead and center line.Yet, ground wire if desired, it also can be connected on the heater so.

Best, current-carrying part also is located on the dielectric base to link to each other with joint, switch contact and the resistance heating track of main connector.

Major joint can adopt foregoing any method to be connected on the heater.Connect material preferably slicken solder or a kind of conductive epoxy resin.Especially like this, copper can not bear the temperature when ceramic articulamentum is toasted when all joints all were copper.

Heater has a metallic substrates herein, and ground wire just preferably directly is connected in the substrate so.This substrate is stainless steel or other steel normally, and has been printed silver-colored printing ink before being printed insulating barrier on the position that ground wire will be installed, and on desired position insulating barrier is stamped the hole then.The remainder of heater can be in the ordinary way by printing and baking insulating barrier, electric conductor and resistive layer making.Articulamentum such as silver-colored ink lay can be coated to the zone of laying parts on the heater, as contact component, joint and supporting member, toast then.If all corresponding parts all are connected in once-through operation on the heater, this is just very effective.

The position of joint is connected to other that parts on heater all will be perforated, reaming or handle the surface area that is connected medium to increase.

Major joint can be the form that is fit to the plug of IEE electrical connector standard, and can be twisted into certain angle or be done into definite shape so that subconnector can be connected in the direction that is parallel to the heater plane.Yet preferably joint is the sort of " wireless " connector, for example a kind of connector that meshes with the subconnector that is located on the pedestal, and heating vessel just is placed on this pedestal.Main connector can be connected on the interior any position of heater scope, and this position can be determined by the required position of leaving shell of tank of reference main connector joint.

In a specific preferred embodiment, these joints are those wireless connector types as describing in WO 95/08204, and the sort of connector and an auxiliary bottom connector mate, and do not consider the corresponding angular orientation of container and the relative vertical axis of pedestal.

Therefore in a preferred embodiment, these joints comprise a central joint plug that is provided with two concentric joint rings around it.Conductor wire and neutral electrical connector are received on central plug and the interior ring, and ground wire is received on the outer shroud.Concentric ring can be provided with circuit breaker with allow conductive traces from plug and interior ring lead to the heating track other parts and can short circuit.

If desired, can adopt welding that the joint component of ground connection is connected in the substrate, especially can adopt laser welding to guarantee more firm connection.

Be appreciated that those joints for example the external ground ring can be used for installing other control assembly, if the suitable insulation part is installed, thereby so just formed dual-use function between them.

The resistance heating track can be provided with by any way.More advantageously, track can be set to the track of a series of discontinuous segments, and they link to each other by the bridge of a kind of high conductive material as silver-colored or silver-plated material.Conducting bridge can be arranged to walk around the obstacle on the heater, for example the part of support unit or be connected main connector on the heater.This is particularly important when this barrier is metal, because must provide enough distances to prevent producing any undesirable electrical connection between them between barrier and track.Will make the heating surface (area) (HS maximization of heater like this.

Dielectric base can adopt any suitable form.Therefore, for instance, dielectric base can comprise a metallic plate that is located on the pottery insulating barrier of (as limiting) here, as a corrosion resistant plate or low carbon steel plate, is provided with the resistance heating track on this metallic plate.Metallic plate also can apply one deck pottery or other material making it and fluid insulation in the face of the side of liquid, and/or the not corrosion of liquid body of protection metallic plate.

Dielectric base is preferably flat substantially, makes the easier and easier resistance heating track of setting up of substrate because make like this.In addition, because dielectric base becomes the pedestal or the part pedestal of heating vessel, therefore the viewpoint from aesthetics needs a flat pedestal.In this case, just need fixture so that heater is fixed on the container.Fixture preferably is located on the flange, and this flange connects and is suspended on the fringe region of heater.This flange is connected on the heater after various insulating barriers, resistance heating track or the like all have been located in the substrate by usual way.This flange can adopt above-mentioned any method to be connected on the heater preferably soft soldering.It is best finishing this step when all other parts all are connected on the heater.Flange has increased very big intensity round this heater that is configured at heater edge, and this metallic plate that just means heater can be made by thinner, more cheap material.

This device itself has novelty, therefore from aspect further, the invention provides a kind of thick film sheet type electric heater that is used for heating vessel, it comprises a basic plane body with a flange, and this flange connects and is suspended on the zone, an edge of plane body.

Flange better is soldered, preferably adopts laser welding on plane body.Therefore when plane body comprised a metallic plate such as corrosion resistant plate, flange just can directly be welded on this plate.Under situation like this, flange material should be the sort of material that can weld.

In liquid heating, need receive between the perisporium of chamber and the heater at liquid a liquid seal is set.So, between the surface of the marginal portion of heater and chamber perisporium, can elastic sealing device be clamped by the clamping device relevant with flange.

More advantageously, the flange section is that a L shaped and L shaped wing is connected on the heater.The side of the perisporium of liquid or container is accommodated between the wing and clamping device of L shaped flange portion, therefore the pressure that acts on the potted component is mainly applied by flange, and substantial pressure does not act on junction between flange and the heater by elastic sealing elements.

Flange can adopt band that its end is joined together to form a cylinder and make.Flange can form a series of cutting mouths by a limit portion at band and make, and these cutting mouths can be bent after forming forming some fins, these fins formation flange of getting together.

Clamping device for instance, can be bayonet socket ring that supplementary structure is meshed on a kind of and the flange.Yet preferably clamping device comprises that at least one is located at the fixing lug boss of end of flange, and a binding ring, and its size can retrain flange basically and be used to retrain vessel, and this binding ring is compressed by the limit portion of fixing lug boss towards container.

Itself is that novelty and creationary is arranged for any heater that those itself form the part of liquid perisporium for this device.Therefore from aspect further, the invention provides a kind of electric liquid-heating appliance, comprising:

A liquid;

A plane heater;

A flange is suspended on the heater fringe region, and this flange has at least one clamping boss on the zone endways;

A binding ring, flange is lived in the big activation constraint of its size;

An elastic sealing elements is arranged between binding ring and the heater edge;

Wherein, liquid side is contained between potted component and the binding ring.

Therefore according to this device, potted component is limited between the side of edge, hanger flange and liquid perisporium of heater, and as heating vessel, like this, potted component is out of shape so that reliable sealing to be provided.Binding ring and clamp that boss provides that a limit portion that makes heating vessel compresses towards the heater edge fast and simple device.

Binding ring, potted component and flange all are the edge placement along heater usually, so they can adopt Any shape, and be especially circular, square or oval.Binding ring is preferably with a kind of form that divides the formula ring, and it just can enlarge to be enclosed within on the clamping boss in assembling like this.Can shading ring be set between binding ring and the container edge or between potted component and container edge so that adapt to the different-thickness of container material, for example glass, plastics or stainless steel.

Clamp boss preferably by being out of shape with the flange monolithic molding.It is preferably fully outwards angled so that can lay binding ring easily there towards heater to clamp boss.The clamping boss that extends along the entire flange end regions can be one.Yet flange preferably has a plurality of discrete boss along its outer surface.

The limit portion of liquid can be arranged to become stepped downwards, so that the upper surface of heater flushes with the inner surface of chamber on the position of using.

In another case, the present invention also provides a kind of liquid heating, comprises that liquid receives the planar thick diaphragm type heater on the opening in the wall that chamber and is installed in liquid chamber, and this heater flushes with all around chamber perisporium.

In the European market, heating vessel as kettle, is set to the normally boiling point of water of liquid that they held usually, automatically they is disconnected then.Often be such situation: the user heating vessel is just opened then no matter it, return again when this container oneself is turned off by the time.The user that need heat up water then can open heating vessel once more and allow the liquid of preheating seethe with excitement before sending.Device like this is also unsatisfactory on the time in energy utilization and user.

The aspect further according to the present invention for heating vessel provides an electric heater, comprises a main heater, is provided with to be used for during the initial energising of heater energising with the predetermined temperature of the liquid heat in this device; And an assisted heating device, it is switched on after detecting said temperature, and described assisted heating device liquid inside has a heat output that approximately equates with rate of heat dispation from liquid heating when being in above-mentioned predetermined temperature.

Therefore according to this aspect of the invention, the liquid heat in the heater extremely can be seethed with excitement by main heater, or to another predetermined temperature.In case reach predetermined temperature, mainly liquid is remained on the predetermined temperature, and needn't adopt any type of thermostatic control by assisted heating device.Liquid is remained on heat required on the predetermined temperature can be determined empirically, and is generally 25-30W.So in case this device is started by the user and liquid has reached predetermined temperature, liquid will remain on this temperature so.

Heater can be a kind of thick film heater, and it has corresponding heater with resistance heating track form.This resistance heating track has constituted the assisted heating device of advocating peace, and they preferably adopt different materials, especially should have different resistance.

The detection of predetermined temperature can be finished by a mechanical heat-sensitive actuating device, and this actuator is the corresponding heater traces of switch selectively.The assistant heating apparatus should separate energising with main heater fully.Otherwise just energising for good and all when assisted heating device can be arranged in heater starting is as in parallel with main heater or connect.

In one preferably was provided with, main heater became the part of assisted heating device, and this assisted heating device comprises the optional feature of a resistive heating device, and these parts have than the higher resistance of main heating element and with main heating element connects.When electric current during by main heating element and optional feature, the magnitude of current will reduce when having only independent main heating element relatively, and energy output simultaneously is also along with having reduced.An advantage of this arranged in series is: adopt an overheat protector just can and be incubated under two kinds of patterns in boiling and protect heater.Be preferably, at main heater duration of work, this extention short circuit.

The output of the heat of auxiliary heater cans be compared to that liquid in containers is remained on the required heat of boiling point is higher a little most, so just can produce vapor bubbles constantly.This just can be for the user provides the indication that can see, and liquid still is in boiling temperature.The heats of assisted heating device preferably will localize substantially, thereby just can see the flow of bubble that one is fixing.This can realize easily with a kind of material of high resistivity, and is the same as mentioned above.In order to see bubble, the most handy a kind of material transparent of container makes, for example glass, Merlon or have a transparent part at least.

This device itself is a structure novelty and that innovation is arranged, therefore from an aspect further, the invention provides a kind of liquid heating, it comprises a heating vessel and an electric heater that is arranged in the container bottom, this heater has the heater that can be used to after liquid boiling the liquid in the container remained on substantially on the boiling temperature, described heater is provided with to produce the flow of bubble of one rising in liquid by the part, and described container is transparent or has one transparent part so that such bubble can be seen by the user.

Traditional if desired operation as when arriving predetermined temperature all power supplys being turned off, can provide a kind of manual override device for good and all assisted heating device is cut off the power supply so.

In heating vessel, kettle especially, traditionally on the handle of container or near meeting be provided with an on-off knob.This knob is the part of switch block independently, and this switch is electrically connected with the master control of container, or mechanically is connected in the master control.Because controller must produce enough power and operate this knob, this set of switching knob has limited the design of controller.This has just produced influence to the intensity of material therefor and cost or the like.

From another perspective, the present invention seeks to provide a kind of liquid heating, this device does not need to be provided with knob, therefore from further purpose of the present invention, a kind of heater is provided, but not specific just liquid heating, it comprises a heater, wherein the heater of this device is that a stimulus movement according to this device leads to and powers on.Therefore, according to this purpose of the present invention, the heater of heating vessel can be opened simply by the handle of mobile containers, and need not manual switch or button.This is just avoided needing knob, jockey electricity or machinery is set between knob or button and heater controller, thereby has produced significant cost savings.In addition, the operation that can reduce in controller is exerted oneself, and allows to adopt more low intensive material, has saved cost further.

Starting motion can be a simple displacement of container, for example a linearity or swing offset, and this start-up operation can be sensed in many ways.For example sense, as adopt magnet and coil device, power on heater is logical according to an induced signal then with electronic instrument or electricity consumption.Yet, preferably adopt a kind of mechanical induction structure.In one preferably is provided with, adopt a kind of mechanism to respond to the acceleration of container as the counterweight of installing rotatably, at this machinery structure be used for the electricity supply of heater is being closed one and overlap between the device of switch contact a mechanical linkage is set.

In a preferred embodiment, the counterweight of a rotation installation links to each other with a cam, and the moving element of the controller of this cam-operated heater is so that shut switch contact.In the specific structure of Miao Shuing, so that it is moved on on the position, shunted or be closed, and heater led to power on by the switch contact that is positioned at adjacent track part on this position on the tripping operation lever arm for this cam in front.By unclamping lever arm effectively, counterweight just has been released, thereby can interference suppressor operation subsequently.

If container around its axle rotation, can be arranged to and can rotate around its installation position under action of centrifugal force so counterweight is installed rotatably.Yet, preferably this counterweight is provided as a inertia mass corresponding to container linearity or rotary acceleration.

Preferably start-up operation is the motion of a rotation, so especially helps wireless device to have aforesaid 360 degree connectors.In this device, this rotation is just effective after this device has been placed on its pedestal.Employing rotatablely moves, thereby just can obtain a sizable acceleration by container is rotated then a direction rotation earlier on another direction, when changing the direction of motion, can obtain maximum acceleration.

When container is placed on its pedestal, preferably device is arranged to heater is turned off, therefore need a special start-up operation that heater is connected, and therefore just can suddenly container not led to during liquid when just container being placed on the pedestal and in the container and power on.Put it briefly, this also is a structure a kind of novelty and that innovation is arranged, it has wired and wireless two kinds of structures, therefore from purpose further, the invention provides a kind of liquid heating, it comprises a heater and a controller that is used for heater, and this controller comprises and be used to control the switching device that heater is provided electric energy that this control piece also is useful on the device of when device is on physically being connected its power supply described switching device being opened.

Under a kind of situation of non-wireless means, can be furnished with the plug that is connected on this device power line on the device, this device is when plug inserts the mains connection jack of this device and work of control piece.Under the situation of aforesaid wireless device, device like this can be arranged on the substrate connector assembly.This base assembly boss can adopt an a kind of flange of connector, the example as shown in WO 95/08204.In case the boss of this device part is during through the flange on base part, then it can move in control piece work.

In a preferred embodiment, be provided with a movable flange in this device connector, this connector is pressed on pedestal or the power line connector by a corresponding flange, two assemblies be interior engagement so that make switch opens.When also can being arranged in connector and unclamping, heater is turned off the flange of cooperating by opening switch contact.

That flange of this device connector is preferably installed rotatably and with the tripping operation lever arm cooperating of control assembly.

Therefore in above-mentioned device, the flange portion of this device acts on the movable support element, so that the switch contact tripping operation.This flange preferably links to each other with the extension of ground joint by connector, and substrate connector flange forms by form a horizontal flanges on connector end forward.This substrate connector also can be used for the deflection of device flange and when this device is lifted away from substrate this device being cut off the power supply when substrate is removed at this device.

This can be considered to a novelty and structure making progress property, therefore from purpose further, the invention provides a kind of radio device, it comprises a substrate connector, and this connector has a near horizontal flanges of free end that is located at the substrate connector; With a device connector assembly, this assembly have one extend in this connector and with an element that switch links to each other of the controller of this device, this device with element by the connector boss relevant connector assembly relatively or contrarily from motion under departed from so that this device is closed.

Therefore in a preferred embodiment of the invention, two of container kinds of different motions are used to this container be opened or turned off as can be seen: one rotatablely moves and is used for it is connected, and one moves both vertically in order to it is turned off.

Can know that above-mentioned various creation schemes and their preferred feature can be used or be used in combination individually.The present invention may extend into a kind of heater assembly, this heater assembly comprise one according to the present invention either side and the heater that draws, heating vessel that comprises the heater that an either side according to the present invention draws and a kind of making one heater and either side draws according to the present invention heater assembly or the method for heating vessel.

Description of drawings

Some embodiments of the present invention will be by way of example below and reference will be made to the accompanying drawings, wherein:

Fig. 1 is the perspective view of heater assembly according to an embodiment of the invention;

Fig. 2 is the view that is similar to Fig. 1, just demonstrates the parts that those link to each other with the heater substrate;

Fig. 3 removes the perspective view of heater substrate for the heater assembly of Fig. 1;

Fig. 4 is an installation detail drawing of crossing thermal actuator among Fig. 1;

Fig. 5 is the detail drawing that is used for the installation and design of Fig. 1 boiling actuator;

Fig. 6 is the view seen below the track layout from Fig. 1;

Fig. 7 is the detail drawing of the jockey of Fig. 1;

Fig. 8 shows the heater according to second embodiment of the invention;

Fig. 9 illustrates part-structure assembling of the present invention;

Figure 10 shows that the follow-up installation diagram in the assembling of Fig. 9;

Figure 11 shows that the finished figure of finishing assembling.

Embodiment

Referring to figs. 1 through 6, the heater assembly comprises an electric heater 1, and it adopts a kind of form with circular stainless steel or mild steel steel plate of a layer insulating 22, is printed with a resistance-type heating track 23 on insulating barrier 22.Track 23 has one deck protectiveness glaze (not shown), and similarly, local porose in necessity is to allow near following track or dielectric base.The liquid in heater and the container such as the processing of water power insulation be handled or be made to the upper surface of heater 1 can with suitable surface coating layer, and/or the not corrosion of liquid body of upper surface of protection heater 1, inside this container is used for heater is installed in.This assembly comprises a controller, and this controller has overheat protective function and boiling inducing function.

As demonstrate among Fig. 2 fully aware ofly, the lower surface of heater 1 has been equipped with the supporting member 3a of an overheat protector; The supporting member 3b of a boiling control piece; A power connector 5 that is rendered as the form of Central Post 7 and is positioned at the center of circular shape heater 1; 9 and external ground rings 11 of neutral ring in one, this both installs with one heart around this binding post 7; A deep gouge 13; Four switch contact 15a-15d; A neon joint 17 and a mounting flange 19.

In this specification, the boiling control device has been given identical label with the corresponding parts of overtemperature protection control device, marks the parts that " a " represents those overtemperature protection systems with son, represents the parts of those boiling control device with son mark " b ".The last link position occupied employing by the heater assembly in heater 1 surface adds a left-falling stroke and represents on the label of these parts itself, as " 15 ' ".

Corresponding supporting member 3a, 3b are the metals of pressure cutting and bending, as mild steel.Each supporting member 3a, 3b are installed on the heater 1 by three legs 21, and described leg is connected on the insulating barrier 22 of heater 1.As can be seen from Figure 6, the heater 1 surperficial upward position 21 of leg ' be the place that is arranged on away from resistance heating track 23, and in these positions 21 ' be provided with a space on every side to guarantee between resistance heating track 23 and supporting member 3a, 3b, can not produce short circuit.Supporting member 3a, 3b also will be by the metallic plate insulation of the insulating barrier on the heater 1 22 with heater 1.

Each has two pivot positions with the form of corresponding breach 25a, 25b supporting member 3a, 3b, is holding edge of a knife 27a, the 27b of corresponding trip(ping) bar 29a, 29b on this position.The opposite side of corresponding breach 25a, 25b is provided with corresponding recoil position (reaction locations) 31a, 31b, it also is the form that is breach, be used to hold the limit portion of Ω shape spring 33a, 33b, be used to make corresponding trip(ping) bar 29a, 29b bias voltage to become of two settling positions, promptly open position and one shut the position.

Each supporting member 3a, 3b are provided with neon joint 35a, a 35b, and this joint adopts form a kind of and the integrally formed thin slice connector of supporting member 3a, 3b.On respective support 3a, 3b, an end place of crossing is provided with hole 37a, a 37b with respect to breach 25a, 25b, this pore volume is being received the end of pivot rods 39a, 39b of cam part 41a, 41b of inertia switch mechanism, and this will be described further below.

Power connector 5 is a kind of so-called 360 degree connectors, and this connector permission (in container) in a substrate parts connects with a corresponding connector and need not consider relevant rotation orientation.This specific joint design is the sort of P72 connector that the applicant knows, and discloses in WO 95/08204.

The binding post 7 of power connector 5 is that the one end is a laser welding with a cylindrical stainless steel deep-draw bar 43, forms a silver-colored post 45 to guarantee reliable electrical connection.Binding post 7 has an employing it is connected the integrally formed overcoat 47 of heater 1 lip-deep method.Thereby this overcoat can be extended or be perforated and presents to the surface area that connects medium and increase the reliability that connects with increase.Binding post 7 adopts soldering to be connected on the surface of heater 1, and this will be described further below.As shown in Figure 6, be used to accept the position 7 of binding post 7 ' be provided with conductive traces 49, this track is connected to binding post 7 the position 15c ' of switch contact 15c.

The neutrality ring 9 of power connector 5 is preferably formed by the stainless steel band that studs with silver-colored limit, and this band is shaped as a ring and its end is connected.Like this, there is silver at the edge that is inserted into the neutrality ring 9 in the respective socket of power connector, to guarantee the there good electrical conductivity is arranged.Neutral ring 9 does not have the edge of silver that whole interior overcoat 51 parts are set, and adopts this overcoat that neutrality ring 9 is connected on the surface of heater 1.This overcoat 51 of neutral ring 9 on the surface of heater 1 with an installation position 51 ' link to each other so that the conductive traces on the insulating surface that is arranged on heater 1 53 with neutral encircle 9 between one of formation be electrically connected.This conductive traces 53 provides installation site 15a ' and 17 ' respectively for contact 15a and neon thin slice 17.The overcoat 51 of neutral ring 9 can enlarge or bore a hole (expanded orperforated) to guarantee reliable connection.Thereby an otch 55 is set in neutrality ring 9 by the perisporium that cuts away some overcoats 51 and neutral ring 9.This otch 55 is and 49 one-tenth of the conductive traces conductive traces 49 that is arranged in parallel and avoided that this track leads to switch contact 15c from binding post 7, just has not been electrically connected between neutrality ring 9 and binding post 7 like this.

Ground loop 11 is a copper, and is configured to and neutral ring 9 similar forms, but it is to be directly connected on the metal sheet surface of heater so that form a ground connection connection there.Insulating barrier is suitably punched to adapt to this connection.Ground loop 11 is provided with three otch.Two 57a, 57b in these three otch allow conductive traces 49 and 53 to pass through under ground loop 11.Another wideer otch 57c is used to hold conducting bridge 59, and this conducting bridge provides the gap for heater 1 lip-deep deep gouge 13.

As will be below with further specifying, on the perisporium of ground loop 11, be provided with a window 61, be used to accept the flange 63 of lever arm 65.The perisporium of ground loop 11 also is provided with two holes 67, and these two holes connect and fixing corresponding flange 69 on plastic mould 71, and plastic mould 71 is equipped with lever arm 65.

Deep gouge 13 is made and is connected by overcoat part 73 on the insulating barrier of heater 1 by stainless steel deep-draw part.As shown in Figure 6, lay the zone 13 of deep gouge ' anyly electrically contacted to prevent between heating track 23 and deep gouge 13, to produce on the heater 1 by conducting bridge 75 center ons.

Neon joint 17 is metal partss of a kind of pressure cutting and bending.The conductive plate 17 of neon joint 17 on silver-plated pottery is connected the insulating barrier that is positioned at heater 1 ' on, this conductive plate 17 ' be connected on the conductive plate 15b ' of neutral switch contact 15b.Therefore neon joint 17 is with the metallic plate insulation of heater 1, but for good and all is electrically connected with the neutrality ring 9 of silver-plated connector 5 by conductive path 53.

Mounting flange 19, it roughly has a L shaped section, and this flange is connected by a wing on the fringe region of insulating barrier of heater 1.The same as will be described in detail below, mounting flange 19 is provided with a plurality of locking flanges 79, and these flanges adopt the bandy rake tooth form of planar radial of mounting flange 19.This flange can adopt as ground loop and neutral ring 11,9 the same modes and make, with a strip plastic deformation become one cylindrical and with their end connection.The wing 77 is installed is can be shaped as a plurality of bent tab.

Switch contact 15 be connected be arranged on heater 1 lip-deep corresponding conductive plate 15 ' on.Conductive plate 15b ' and 15c ' are connected on conductive traces 49 and 53 from the joint 7 charged and neutrality and 9 of power connector 5.Conductive plate 15a ' and 15d ' are electrically connected with resistance heating track 23 by conducting bridge 47.

With reference to accompanying drawing 6, the insulating barrier of heater 1 is provided with a resistance heating track 23, and it is the form that adopts by a plurality of discrete serpentine track section of conducting bridge 81 interconnection.Main heating track 23 extends between switch contact installation site 15a and switch contact installation site 15d.Conducting bridge 81 allows the resistance heating tracks to walk around heater 1 lip-deep obstacle, for example because the position of link, and does not need to reduce the bending radius of track, can make current concentration like that and cause local overheating.

A sinuous part 83 of main heating track is the bimetal leaf actuator 85 that is used for laying overheat protector.This curve form of this part 83 can guarantee to have only a relatively low voltage difference in actuator 85, has reduced the possibility that produces short circuit in actuator.

Be included within this part of wriggling but do not constitute main heating track 23 a part be an assistant heating track 87, it connects between online conductive traces 43 and the switch contact 15d.Assistant heating track 87 used materials have than the higher resistivity of main heating track, so it has the resistance more much higher than track, and its reason will be further described below.

Described in WO 97/39603, track 23 is provided with a zone 89 or a plurality of regional 89, and it optionally is under the serious overheated situation at heater 1 and fuses.These zones 89 begin to be replaced by track part 83 from the end of track.This has reduced with regard to meaning the electrical potential difference between the adjacent track part, causes having reduced electric current when track is out of order, thereby just prevents the blowout of external power source.

Heater 1 and various parts that are connected on it are done some explanations, be necessary to describe the manufacturing process of this device now.At first, adopt the hole of any suitable method as preparing a plate such as corrosion resistant plate by disclosed method of blasting process among the WO97/47223, have on this plate to be used for to communicate with deep gouge 13.

Then metal ink such as a kind of silver or copper printing ink are printed on the zone that on the metallic substrates those have directly with this metallic plate is connected, as in the installation site 11 that is used for ground loop 11 '.Carry out drying or baking then.Then covering on the metallic plate as printing last layer or a few layer insulating to a preset thickness, and on the appropriate location of metal ink, forming the hole so that passage necessary on the metallic plate to be provided.Track 23 is applied to then as being printed onto on the insulating barrier.This finishes in twice operation, because adopted two kinds of different trace material.Insulating barrier and track depending on circumstances can be toasted or baking together individually.

After track 23 is applied in, conductive path 49,53,75,81 just printing go up silver or alloy printing ink, and carry out drying or baking.

Then, printing last layer protectiveness is covered glaze on track 23, goes up in position to form the hole so that provide passage for conductive path, dielectric base and metallic plate.

Then, with ink coats silver or other metal to those zones 21 of insulating barrier ', 19 ', 13 ' on maybe to lay on the protectiveness glaze of parts to form the bonded layer that one deck is used for soldering.Then with this layer drying or baking.Subsequently with solder-coated to be useful on the zone of laying as parts such as supporting member 3a, 3b, binding post 7, neutral ring 9, ground loop 11, deep gouge 13, switch contact 15a-15d, neon thin slice 17 and mounting flanges 19.

This can select and lay machinery and finish by commercially available.In case be on each position, this assembly can be heated to 300 ℃ to be connected on the heater with solder fusing and with parts.This technology allows all parts just to be fixed in once-through operation.Scolder preferably relatively cheap and under the temperature that can not have a negative impact, melt the copper ground loop.Simultaneously, the surface tension of scolder when fusing can make parts fix on their position.

Then, the miscellaneous part of installation and control device is prepared in load module, as described in following.

Refer again to accompanying drawing 1, a plastics lever arm 65 is installed in plastic mould 71 pivotly, plastic mould 71 is embraced ground loop 11 and is held by each projection, in the hole 67 of these projection engages on ground loop 11 perisporiums.The rotating shaft 93 of lever arm 65 is to be provided with like this: the flange 63 that stretches out from ground loop 11 split sheds 61 connects by a flange that stretches out of a P72 substrate connector, and it is subjected to radially outer power, and lever arm 65 is rotated away from the surface of heater 1 like this.This effect will be explained below.

Be installed in the overheat protector actuator 85 in addition on the plastic mould 71.This actuator be a kind of in GB1542252 disclosed round end quick-action type actuator (domed snap-acting type).Actuator 85 is biased against the sweep 83 of heater traces 23 by a spring element 97 in application, and spring element 97 is bearing the tongue of the actuator 85 that is inserted in a clip 99.Spring 97 is being fixed actuator 85 lightly and is being contacted and be sandwiched on the plastic mould 71 with heater 1.When the temperature of actuator 85 arrived its predetermined working temperature, the actuator quick-action made it oppositely crooked (snap-action), thereby the edge of actuator 85 impels trip(ping) bar 65 to break away from heater 1.Actuator 85 is used to be under a kind of failure condition at heater and moves, for example leading to electricity when heater in container during without any liquid.

The free end of lever arm 65 is connecting each trip(ping) bar 29a, 29b.Ω shape spring 33a, the 33b of trip(ping) bar 29a, 29b selects like this: under the effect of Ω shape spring 33a, 33b, the shortage in weight of lever arm 65 so that trip(ping) bar 29a, 29b around their corresponding rotating shaft rotations.Therefore, in the used position of heater assembly, lever arm 65 is supported by trip(ping) bar 29a, 29b.

Each trip(ping) bar 29a, 29b are being with corresponding contact bridge 101a, a 101b, and these contact bridges 101a, 101b are sandwiched on lug plate 103a, the 103b on trip(ping) bar 29a, the 29b.Each contact bridge 101a, 101b are provided with two switch contact 105a, 105b, these switch contacts contact with auxiliary switch contact 15a-15d when trip(ping) bar 29a, 29b are on the position of " opening ", make electric current pass through corresponding contact bridge 101a, 101b and between switch contact is to 15a-15b and 15c-15d, flow, thereby electric current is flow on the heating track 23.

As mentioned above, each corresponding trip(ping) bar 29a, 29b are made for a kind of metal crimp product and have the opening of a stamp, and trip(ping) bar 29a, 29b can be around this edge of a knife rotations. Ω shape spring 33a, 33b response position 31a, 31b on supporting member 3a, the 3b directly engage with response position on trip(ping) bar 29a, the 29b so that each trip(ping) bar 29a, 29b are offset to or the position of " opening " on, wherein switch contact 105a, 105b are against switch contact 15a-15b; Or on the position of " pass ", wherein switch contact 105a, 105b are forced to leave pass contact 15a-15b.

Be provided with plastic cam 111a, a 111b between the end away from lever arm 65 on heater 1 and each trip(ping) bar 29a, the 29b.As shown in Figure 5, be installed in rotatably on the axle of a basic horizontal between its respective support 3a, 3b and the plastic mould 71 by live spindle 113a, 113b each cam 111a, 111b.Counterweight 115a, a 115b and each cam 111a, 111b form whole and hang thereon.Suddenly be subjected to one in one direction when having the rectilinear motion of very big component on the direction perpendicular to the rotating shaft of cam 111a, 111b around the rotation of its axis or when the heater assembly when the heater assembly, the inertia of counterweight 115a, 115b can impel cam 111a, 111b to rotate around its corresponding axle.The cam face of each cam 111a, 111b comprises a pair of from the outwardly directed fin 117 of rotating shaft, like this when cam 111a, 111b rotate under the influence of counterweight 115a, 115b in any one direction, one or other cam face fin 117 with its corresponding trip(ping) bar 29a, 29b is meshed and force it to leave the position of heater surfaces to " opening " under the effect of Ω shape spring 33a, 33b.Like this, cam 111a, 111b and counterweight 115a, 115b form the switching mechanism of an integral body.

Referring now to accompanying drawing 5, the close cam 111b place, end at boiling trip(ping) bar 29b is equipped with a spring part 121 that is essentially V-arrangement.This spring 121 is sandwiched on the plastic mounting platform 123 on the end that is installed in boiling trip(ping) bar 29b.These of spring 121 bias voltages are against one as the induction of the boiling on the heat-conducting plate 127 of copper bimetal leaf actuator 125, and this heat-conducting plate and deep gouge 13 carry out thermo-contact.Actuator 125 is disclosed the sort of types in GB1542252, and the tongue of actuator 125 is sandwiched in the clip 131 of spring 121.The similar device of a kind of bimetal leaf, deep gouge and heat-conducting plate is very at length disclosed in WO 97/04694.

Heat in the deep gouge 13 is directed on the heat-conducting plate 127, from then on imports actuator 125.Boiling actuator 125 is used to start under the temperature of a heat-conducting plate 127 relevant with the boiling point of liquid in containers.Heat-conducting plate 127 forms a thermo-lag and produces harmful tripping operation and make boiling continue a preset time to prevent bimetal leaf 125 between deep gouge 13 and actuator 125.When preset time to the time, this bimetal leaf is crooked oppositely and impel the surface of the end of spring 121 and trip(ping) bar 29b towards heater 1 with it.This will make trip(ping) bar 29b rotate to the position of " pass " around edge of a knife 27b under the active force effect of Ω shape spring 33b.

The operation of heater assembly will illustrate below.

When the heating vessel that heating component is installed just has been placed on the substrate (not shown) that is provided with a wireless connector, especially in WO 95/08204 during disclosed the sort of connector, the flange of this substrate connector (bead) engages and makes lever arm 65 rotations to leave the surface of heater 1 with the projection 63 of lever arm 65.In such rotation, lever arm 65 impels the end of trip(ping) bar 29a and 29b to leave the surface of heater.Then each trip(ping) bar 29a, 29b opposing live in Ω shape spring 33a, 33b active force around its corresponding edge of a knife 27a, 27b rotating eccentricity to the position of " pass ", contact bridge 101a, 101b are lifted on this position, thereby open switch contact 105 and 15.Therefore, two trip(ping) bars 29 all are on the position of " pass " and do not have electric current to pass through resistance heating track 23.

Heating vessel is around the rotatablely moving and can impel two of counterweight 115a, 115b all swings subsequently of the axle of connector 5 in the substrate, and impels corresponding cam 111a, 111b to rotate around their axis.The rotation of cam 111a, 111b can make the cam face of cam fin 117 promote the position that each trip(ping) bar 29a, 29b deviate to " holding ", shuts switch contact 105 and 15.Because trip(ping) bar 29a, 29b remove from cam 111a, 11b, so the latter just can not interference suppressor operation subsequently.

On this position, the contact bridge 101a that is carried by trip(ping) bar 29a contacts with 15b with switch contact 15a, and electric current just is fed on the end of main heating track 23 from neutrality ring 9 like this.Will be noted that this main heating track 23 links to each other with hot-line connector 7 by switch contact 15d, conductive traces 43 and auxiliary heating track 87 at its place, other end.Yet when trip(ping) bar 29b was in its position of " opening ", contact bridge 101b linked to each other with 15d with switch contact 15c, and this just forms short circuit on assistant heating track 87, did not so just have the electric current assistant heating track 87 of flowing through.Therefore, when trip(ping) bar 29a and two of 29b were in the position of " opening ", electric current was flowed through main heating track 23 so that the liquid in the container is heated, and did not have the electric current assistant heating track 87 of flowing through.Usually, can produce the heat of 2.2kW with 220V voltage heating track 23.

When liquid in containers heated, up to boiling, at this moment its temperature rose rapidly the temperature lag of deep gouge in the other parts of heater.The rising of this temperature is transferred in the actuator 125 along heat-conducting plate 127, this actuator start working so that trip(ping) bar 29b off-centre to the position of its " pass ", wherein switch contact 105c and 105d lift from heater, thereby open switch contact 105c-15c and 105d-15d.Therefore, no longer short circuit of assistant heating track 87, and electric current by means of conductive traces 49 and assistant heating track 87 from the hot-line connector 7 main heating track 23 of flowing through.Be noted that switch contact 15a-15a and 15b-15b close all the time, an end of main like this heating track 23 keeps encircling 9 contact with neutral.The resistance of assistant heating track 87 is to select like this: when main heating track was connected with assistant heating track 87, the electric current of the main heating track 23 of the flowing through electric current than the main heating track 23 of flowing through when main heating track 23 directly links to each other with hot-line connector 7 significantly was low.The result, when trip(ping) bar 29b jumps to its position of " opening " and trip(ping) bar 29a when being on the position of its " pass ", as described just now, main heating track 23 and assistant heating track 87 are leading to a relatively low electric current and are therefore producing a relatively low power output.The resistance of assistant heating track 87 is to select like this: the power output of main heating track 23 and assistant heating track 87 can just in time remain on the liquid in the container on the boiling temperature under this relatively low electric current, and for example the power output of the heating track of this combination approximates the rate of heat dispation from the heating vessel that is in boiling temperature greatly.Needed power output can decide by rule of thumb, for example is approximately 30W.

This heats will roughly all be concentrated in the parts 87.Usually the resistance of track 23 is about 22 Ω, so that produce the heat of 2.2kW under 220V, parts 87 resistance are approximately 1620 Ω, produces the heat of 30W.In this case, have only about 0.5W heat in track 23, to produce, in parts 87, produce the heat of 29.5W.

This localized heating effect can be used to produce a flow of bubble that runs through the stable rising of container, if container is transparent or has a transparent part like this, so just can see that the liquid in the container still is in boiling temperature.

The heating track of combination (backbone mark 23 adds auxiliary track 87) continues led to electricity and is pulled on the position of its " pass " up to trip(ping) bar.This can occur in two ways.At first, if heating vessel is lifted away from substrate, the flange of substrate connector will engage and make lever arm 65 rotations to force trip(ping) bar 29a off-centre to arrive on the position of its " pass " simultaneously with flange 63 so.Auxiliary, enough high if the temperature of heater 1 becomes, cross thermal actuator 89 so and will start working, force lever arm 65 to head on trip(ping) bar 29a and make it move off-centre and arrive on the position of its " pass ".

If trip(ping) bar 29b also is on the position of " opening ", for example because also not boiling of liquid in containers, also trip(ping) bar 29b can be pushed into the position of " pass " so by the rotation of these any lever arms that caused 65 of phenomenon, lead heating track 23 thereby guarantee definitely not have electric current to flow through.

Fig. 7 has showed the limit portion 151 that is equipped with according to the heating vessel 153 of heater assembly of the present invention.The inner edge portion of the bottom that this edge 151 is plastics, glass or a canister, it is limited with a circular hole 155, accommodates the mounting flange 19 of heater in this hole.Edge 151 is stepped as shown in Figure 7, and heater 1 just keeps flushing with the upper surface 157 of the substrate of heating vessel like this.Potted component 159 with a kind of rubber or elastic ring form is placed between the stepped part 161 of heater 1 and limit portion 151.A locking back-up ring 163 is placed on the holding flange of mounting flange 19 and by holding flange and keeps engaging with container limit portion 151, and the awl wing help latter of described holding flange lays.

As can be seen, potted component 159 is to be subjected to level and vertical two kinds of pressure between mounting flange 19 and edge 161, thereby forms a sealing reliably on this position.Axial sealing load mainly is to be applied on the fin 77 and holding flange of mounting flange 19, the pressure that oneself just is subjected to seldom of heater 1 like this, thus protected connection between heater 1 and the mounting flange 19.

Between back-up ring 163 and limit portion 151, be provided with pad to adapt to the different-thickness of heating vessel material.

Describe referring now to Fig. 8 to 11 couple of auxiliary embodiment of the present invention.This embodiment and the above-described main distinction are: each the locational element at power supply only is provided with a switch contact, rather than resembling among the embodiment of front the pair of switches contact is set; Be: each supporting member forms the part of the circuit of heater assembly; Be: this moment, each supporting member was used for being installed in the dry type switch on the lever arm and corresponding counterweight being installed, and boiling response bimetal leaf actuator be mounted on the heating heat-conducting plate rather than on an end of trip(ping) bar.

Now explain, as can be seen from Figure 8, the heater 202 of this embodiment has a track 204, and this track 204 is to arrange with the very similar mode of front embodiment.The main distinction is, in each side that the power supply that corresponding single contact installation pad 206a, 206b are provided in a side of track 204 is supplied.Installation leg 210a, 210b that pad 208a, 208b are used to accept corresponding trip(ping) bar supporting member 212a, 212b are installed.Another installation site provides to a neon joint 216.

As can be seen from Figure 9, supporting member 212b (it is made of copper with other supporting member 212a) is connected with foregoing two pad 208a, and these two pads are connected on the appropriate section of heating track 204.This effect will be further described below.In addition, corresponding supporting member, resilient because their shape is said so to a certain extent, this just makes them can adapt to the associated expansion that occurs in application.

Binding post 220, neutral ring 222 all are connected on the heater as front embodiment with ground loop 224, deep gouge 218 and supporting member 212a, 212b.

Yet ground loop better is welded in this embodiment, and preferably laser welding is in the heater substrate.This just can provide a kind of stronger connection, and the impact that makes ground loop 224 to bear better to occur in application and can not breaking away from heater 200.When ground loop 224 is welded in the normally stainless substrate,, is necessary for example to adopt a kind of copper facing or silver-plated low-carbon (LC) steel loop rather than adopts copper ring for the ease of welding.Simultaneously, neutrality ring 222 is positioned and strengthens connector component, one can be placed on the binding post 220 to lay neutral ring 222 such as insulation insulating washer made of paper in order to be beneficial to.This packing ring can be porose to receive the epoxy resin that a kind of injection is advanced, the intensity that this epoxy resin is used for further sealing this binding post and neutral joint 220,222 and increases connector simultaneously.

Simultaneously, the embodiment as the front, corresponding supporting member 212a, 212b are supporting trip(ping) bar 230a, 230b.In this embodiment, corresponding trip(ping) bar 230a, 230b are copper, and are flexibly to be supported by common C shape spring 232a, 232b.Trip(ping) bar 230a, 230b are equipped with switch contact 226a, 226b in their end, be used on position 206a, the 206b be installed in heater on switch contact 228a, 228b contact.

Further difference between the embodiment of this embodiment and front is, be attached to heat-conducting plate 233 on the deep gouge in this embodiment boiling response quick-action bimetal leaf actuator 234 is installed, this actuator is mounted on the end of corresponding trip(ping) bar in front.Therefore, in this embodiment, actuator 234 is fixed on the heat-conducting plate 233 by a beryllium copper spring clip.This spring clip 236 is a kind of ligulate springs 238, and this spring is engaged on a slit 240 that is arranged on heat-conducting plate 226 upper surfaces.Molded plastics plug-in unit 238 be installed on the arm 240 of tripping operation lever arm 230b and be set near on the outer circumferential of actuator 234 so that its motion is passed on the trip(ping) bar 230b.

It can also be seen that, especially from 10 and 11 as can be seen, now corresponding trip(ping) bar supporting member 230a, 230b are equipped with counterweight 250a, 250b, and at the axle journal 252a and the 252b that are equipped with on this end on installation leg 210a, the 210b that is positioned at their ends.Control surface 254a, the 254b of corresponding counterweight acts on the corresponding surperficial 256a of trip(ping) bar 230a, 230b, the 256b.Simultaneously, each trip(ping) bar supporting member 212a, 212b have the upright leg that makes progress on their end forward accordingly, have axle journal on this leg to be received in the rotating shaft 264 of the dry type switch on the lever arm 266.Lever arm 266, embodiment as the front, a quick-action bimetal leaf actuator 268 is installed, is contained on this actuator on the leaf spring 270 of a beallon, this leaf spring is used to make actuator to depart from the sweep that heats track 202 flexibly in application.Embodiment as the front, this lever arm 266 also has the lug plate 272 that stretches out below corresponding lug plate 274, and lug plate 274 is arranged on the front end of corresponding tripping operation lever arm 230a, 230b.Simultaneously, also be provided with a flange 276 that stretches out in the hole 278 from annular ground joint 224, be used for when this device is placed in or is lifted away from supporting member, being connected with a power connector.

The operation of this embodiment will be briefly described below.

Embodiment as the front, when the heating container that heater assembly is installed is placed in the substrate with a kind of the sort of wireless connector of describing in WO 95/08204, the flange 266 of substrate connector leaves heater surfaces with 276 engagements of the flange of lever arm to make it rotation, thereby lug plate 274a, the 274b of trip(ping) bar 230a, 230b are lifted, trip(ping) bar is with regard to tripping then, thereby switch contact 280a is lifted away from switch contact on the track.Two trip(ping) bars all are in the position of " pass ", and do not have electric current to be supplied to resistance heating track 234.

Embodiment as the front, control surface 254a, the 254b who will make corresponding counterweight that rotatablely moves of container acts on surperficial 256a, the 256b of tripping operation lever arm 230a, 230b, impel trip(ping) bar eccentric mobile, thereby switch contact 226a, 226b those switch contacts 228a, the 228b on heater 200 shut.

As knowing from Fig. 8, in this case, to 228b, 226b, power supply is supplied to trip(ping) bar 230b from binding post 220 by means of switch contact, and is supplied on trip(ping) bar supporting member 212b and the track by means of the installation leg 210b of front.Neutral ring 222 is connected on track and the tripping operation lever arm 228a, 226a by switch contact, and from then on is connected on the installation pad 208a of front by supporting member 212a.

The installation leg 210b bridge joint of trip(ping) bar supporting member 212b two contact areas as can be seen, so in this case the length between respective support 290 as the front by short circuit, but the remainder of track alives.

As front embodiment, when liquid in containers was seethed with excitement, bimetal leaf actuator 234 was started working so that trip(ping) bar 230b trips, thereby opens switch contact to 228b, 226b.When this takes place, power supply will be directed on the innermost track 290 of sweep 292 through track by binding post 220, import power supply track part by supporting member 212b, lead top installation pad 208a around track, also lead switch contact to 226a, 228a, arrive neutral ring 222 then through supporting member 210a and trip(ping) bar 232a.Embodiment as the front, this rail track feature should be selected like this, thus heats can be concentrated in the radially outer bending area 292 so that can produce a flow of bubble that runs through the stable rising of capacitor.

As front embodiment, this situation lasts till always that when container is lifted away from substrate the flange on lever arm 266 under this situation will be rotated by the substrate power connector so that lift and make trip(ping) bar 210a tripping operation so that switch contact 226a is lifted away from track lever arm 266.If heter temperature becomes sufficiently high simultaneously, bimetal leaf actuator 268 will start working and impel lever arm 266 to leave track so that lift tripping operation lever arm 272 once more and open switch contact to 226a, 228a so, thereby turn off heater.

What certainly know is also to have other difference between the embodiment of this embodiment and front.For example mounting flange 300 has a bayonet type fittings in this embodiment.Consider simultaneously based on intensity to this end, preferably with this flange laser welding in substrate, flange 300 should be a kind of material that can adopt this mode to weld, for example zinc-plated or silver-plated mild steel.

Be understandable that various inventions described herein can be used separately, or as shown in a preferred embodiment like that, be combined in the same device and use.For example, when wireless device is placed in its substrate, influence connector construction that heater cuts out and can be applied on any heating vessel (just those adopt sheet formula heaters), and can be applied to different connector constructions, also can be the connector of non-360 degree shown in the WO 95/08204 for example, as the applicant's P75 connector (open in UK appearance design 2052182).Equally, relating to the present invention who is used for the maintenance of the liquid in container boiling and can adopt any type of heater, is not the thick-film type heater.

Those of ordinary skill can know that the method for optimizing of making heater described herein has progressive significantly, needn't adopt a shell that is used to control, and adopts the supporting of heater as other parts that are used for controller and this device itself.Transported to the producer with before being assembled into a product, this device can carry out pre-assembled and test after producing.Because just combined normally also being less than this step heater and controller, this just can reduce the percent defective in that step significantly, this percent defective is quite high at present.

According to invention, a kind of method of making thick film heater comprises that the functional unit that will be used for the controller of heater is connected to the step on the heater.

According to the present invention, a kind of method of making thick film heater comprises that at least one joint that will be used for an external power supply connector of heater is connected to the step on the heater.

According to the present invention, a kind of method of making thick film heater comprises a temperature sense deep gouge is connected to step on the heater.

According to the present invention, above-mentioned connection is to adopt soft soldering to connect.

According to the present invention, scolder preferably is printed on the desired location on the heater, and subsequently with the scolder heating with solder fusing.

According to the present invention, a kind of method of making the thick film electric heater, comprise slicken solder or hard solder are coated on the position of expecting on the heater that placing component solidifies coating material so that each parts is fixed then they are installed on the above coated material of heater and heating.

Preferably, the layer of metal ink coats to be accepted on the zone of scolder to heater.

Preferably, when contact pins or other silver-colored parts are printed on heater with these ink coats to heater.

Preferably, parts on the heater punch with being connected, reaming or other are handled with increase and offered the surface area that connects medium.

Claims (8)

1. liquid heating, wherein, it comprises a heater, this heater has a main heater, be used for energising during the initial energising of heater, thus the liquid heat in will installing to a predetermined temperature, and assisted heating device, it is logical powering on after that temperature is detected, and described assisted heating device is exported having the heat dissipation speed power about equally with liquid heating when the liquid in the device is in predetermined temperature.

2. device as claimed in claim 1, wherein, heater is a kind of thick film heater, its corresponding heater is the form that adopts the resistance heating track.

3. device as claimed in claim 2, wherein, the resistance heating track of forming the assisted heating device of advocating peace is the material with different resistivity.

4. as each described device of claim 1-3, wherein, assisted heating device comprises the slave part of a resistance heating track, and this part is connected than the resistance height of main heater and with main heater.

5. as the device of claim 1-3 described in each, wherein, the output of the heat of assisted heating device is higher a little than liquid in containers being kept the needed heat of boiling.

6. device as claimed in claim 5, wherein, the heats of assisted heating device localizes, and so just can see from the flow of bubble of a string part that heater rises.

7. device as claimed in claim 6, wherein, the liquid container of device is transparent or has a transparent part.

8. as the device of claim 1-3 described in each, wherein, the heater of this device is to be powered on by logical according to a start-up operation of this device.

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