CN1297222C

CN1297222C - Electric heating pressure cooking device

Info

Publication number: CN1297222C
Application number: CNB2004100496037A
Authority: CN
Inventors: 王永光
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-21
Filing date: 2004-06-21
Publication date: 2007-01-31
Anticipated expiration: 2024-06-21
Also published as: CN1623478A

Abstract

The present invention relates to an electric heating pressure cooker which belongs to an electric heating pressure cooking utensil for a kitchen. In the present invention, a pot cover and a pot body are connected by an elastic element and a sealing ring, the displacement of the elastic element is used for driving a switch to control the heating of the pot body so as to control the internal pressure of the pot, and pressure safety is ensured by a decompression gap which is generated by the displacement of the elastic element under superpressure. A long arc screwing press selecting proposal is proposed, the cooking pressure is selected by the screwing displacement of the pot cover, the control of cooking time is selected by using an electronic timer to be matched with the screwing of the pot cover, and thus, the operation without buttons for selecting optimal cooking fire is realized. The present invention provides an excellent patent technology for the commercialization of similar products.

Description

A kind of electric heating pressure cooker

Affiliated technical field: the invention belongs to hot electric pressing pressure cooking apparatus for kitchen use, is the product patent technology of electric cooker pressureization, smolderingization.

Background technology: Chinese invention patent ZL91100026.7 has proposed a kind of technical scheme of fully-sealed electric cooker, this patent is controlled at pot inner pressure on the pressure selected value, bucket formula structure wherein has Electromechanical Design condition preferably, but often elastic arm and bucket are made one aborning, therefore product the setting of the position of flexible member, elastic arm select with the material of bucket and production technology on, particularly on the contradiction of the height dimension error of treatment product main parts size and elastic arm displacement, also have problems.Though the culinary art form of thermos-cooker shows unique characteristics, cooking temp defective low, that use is inconvenient restricts its development, and therefore pushing thermos-cooker to pressureization, electric heatingization also is a kind of exploitation direction.The electric heating pressure stew cooker technical scheme that Chinese invention patent ZL98100976.X proposes has shortened cooking time and has improved cooking quality, and the lid that closes of its proposition selects the pressure technology to make the progressive meaning that has more easy and simple to handle.But its structural deficiency as: adopt elastic cover and elasticity pot tooth to finish the elastic displacement of vertical direction jointly, the radially physical dimension and the outer pot of elasticity pot tooth are contradictory to the bulk between the shell, by two switches---flash switch and starting switch control circuit, the vent valve that the needs setting is made up of spool and valve seat etc. haves much room for improvement, especially there is contradiction in elastic cover for guaranteeing the necessary physical dimension of its elasticity and closing between the technical parameter that covers the choosing pressure, make the pot cover choosing press arc length little, not only influence the appearance design of product, screw the choosing hold up the difference big disadvantage can't avoid especially, the said structure defective effect market competitiveness of this patent.The present invention makes technological improvement to the weak point on above-mentioned two patent structures.In addition, do not see as yet and approach interrelated data of the present invention and information more.

The objective of the invention is: propose a kind of to screw the electric heating pressure cooker of the pot cover selection culinary art duration and degree of heating, this device has the function that limits operating pressure in interior maximum working pressure of pot or the control pot, has improved existing electric cooker, thermos-cooker and has caused the long disadvantage of cooking time because of cooking temp is low; Proposition is provided with sealing ring and realizes the heat expansion type sealing between pot cover and pot body; Propose the technical scheme that pot cover and pot tooth coil adopt the oblique tooth of long arc to be screwed together, can increase substantially the joggled strength between the two, press arc length to reduce angular error to add general election; Proposition is provided with region of no pressure and selects nip to increase the pressure bearing capacity of oblique tooth; Adopt a pot cover and pot deficiency of tooth combination results elastic displacement at existing patented technology, independently flexible member is set up in proposition, make pot cover and pot body realize that by flexible member elasticity is screwed together, utilize the difference driving switch that screws the elastic displacement that displacement and pot cover produce under the pot inner pressure effect of pot cover, not only realized the selection of pot inner pressure and control automatically, also make the present invention possess relief type pressure release function, thoroughly solved the pressure security problem; Proposition is provided with the heat expansion type sealing ring and leaves seal clearance between pot cover and pot body, can save the float-controlled valve of venting usefulness; The proposition employing screws to touch with electronic timer and is connected, and realizes screwing pot cover and selects the electromechanics of cooking time to connect; Proposition activity neck ring cleans difficult problem down to solve the pot tooth; Proposing to be provided with on the insulation cover step-down window uncaps the time with the step-down of shortening soup congee group food.

The object of the present invention is achieved like this: a kind of to screw the electric heating pressure cooker of the pot cover selection culinary art duration and degree of heating, it comprises pot cover, sealing ring, pot body, pot tooth coil, flexible member, the outer support of pot, electric heater, switch module, electronic timer etc.Pot cover and pot tooth coil adopt the oblique tooth of long arc to be screwed together, operating pressure in the required pot is selected in the displacement that screws with pot cover, owing to be provided with flexible member between outside pot tooth coil and pot, supporting, pot cover has just possessed the elasticity feature that is screwed together with a pot body, the outer bottom of supporting of pot is provided with electric heater, the pot body is arranged on the electric heater, sealing between pot cover and pot body is finished by the heat expansion type sealing ring, the pot body is realized outer being rigidly connected of supporting of pot body and pot by the lower surface of its pot edge with the outer upper surface of supporting of pot, switch module is arranged between the stationary end and shift end of flexible member, switch connected with electric heater insert power supply, utilize the difference driving switch that screws the elastic displacement that displacement and pot cover produce under the pot inner pressure effect of pot cover, the control electric heater is realized the automatic control to pot inner pressure to the heating situation of pot body.Electronic timer is then finished the control to the pressure cooking time.The present invention has the function that limits operating pressure in interior maximum working pressure of pot or the control pot.Maximum working pressure in the described qualification pot is meant and no longer controls heating and by its natural heat dissipation step-down, protect hot type culinary art (being called for short high temperature protects hot) with the high temperature in the pot after pot inner pressure reaches the maximum pressure value of qualification.Operating pressure in the described control pot is meant pot inner pressure is controlled on the required operating pressure of culinary art all the time, can carry out high temperature controlling temp type culinary art (being called for short the high temperature temperature control) according to this.

The pot tooth of the lid tooth of pot cover of the present invention and pot tooth coil adopts the oblique tooth of long arc to be screwed together, and the lid tooth all has identical little lift angle with the pot tooth, for sake of convenience they is referred to as oblique tooth.Have the choosing of enough arc length complete machine designs to press arc length when choosing is pressed for making to screw, reduce screwing the angular error that produces when the displacement choosing is pressed, guarantee to cover the joggled strength between tooth and the pot tooth, the present invention proposes the oblique tooth scheme of long arc.Compare less than 30 ° with the pot tooth angle of prior art, the pairing angle of this oblique tooth arc length is greater than 30 °, and the pot tooth arc length of comparable prior art increases by 1 times.The oblique tooth of described long arc is meant the oblique tooth with oblique tooth arc length lengthening, or says that the formed angle (being called for short oblique tooth angle) with two end points of oblique tooth and the line of centres increases the oblique tooth of title long arc afterwards.Described choosing presses arc length may be defined as: the arc length of indication point motion track in selecting the pressure scope is pressed in choosing.Being screwed together is the structure of using for reference multi start thread, pot cover is screwed with a plurality of oblique tooth rigidity with pot tooth coil be connected, and this connected mode has just formed the architectural feature that long arc of the present invention is screwed together in conjunction with the oblique tooth of long arc.The method that can also reduce oblique tooth quantity increases choosing and presses arc length to make it more to meet the complete machine designing requirement.Described pot tooth coil is meant and is arranged on the outer annular steel ring that supports the outside of pot, fixedlys connected with flexible member in the bottom of its vertical direction, and the uniform some pot teeth with identical little lift angle of its upper end horizontal direction are used for screwing with the lid tooth of pot cover and are connected.Each screws all vertical heights of a corresponding oblique tooth of angle because of pot cover, so the pairing height value of angle displacement (abbreviation screws displacement) that screws of pot cover has stable functional relation with oblique tooth vertical height.Realize that by flexible member the elasticity on the mechanics is connected with the pot body because of pot cover again, so the vertical displacement of pot inner pressure and flexible member also has stable functional relation.Correlation with the vertical height value of oblique tooth vertical height value in above-mentioned two functional relations and flexible member displacement, determine to screw the functional relation of displacement and pot inner pressure, it is all corresponding with a pot inner pressure value to make each of pot cover screw the pairing height value of displacement.Above-mentioned pot cover is screwed vertical displacement value poor of pairing vertical height value of displacement and flexible member, be called " screwing the poor of displacement and elastic displacement ", can realize selecting and controlling the purpose of pot inner pressure according to this.

Screw the requirement of strength of angle and oblique tooth engaging stress based on pot cover, in pot cover screws scope, be the boundary with the zero-pressure line, pot cover is set to screw the region of no pressure of displacement and selects nip, from initial position to zero-pressure line is region of no pressure, and its corresponding pot inner pressure value of optional position that pot cover screws in region of no pressure all is zero.When pot cover screwed to the zero-pressure line, pot tooth of its lid tooth and pot tooth coil had had the engagement arc length from the initial position that screws to the zero-pressure line, therefore covers tooth and has just had enough pressure bearing capacitys with a pot tooth when the zero-pressure line.To screwing maximum angular for selecting nip, it is zero to the maximum working pressure (MWP) value that pot cover screws in selecting nip pairing pot inner pressure value from the zero-pressure line, and what promptly select the nip correspondence is working pressure range.In like manner, tiltedly tooth and the pairing height value of horizontal line are also demarcated with the zero-pressure line, and the oblique pairing height value of tooth does not participate in pressure control in the region of no pressure.Tiltedly tooth is corresponding with the displacement break-make parameter of switch with the pairing height value of horizontal line in selecting nip, therefore pot cover screws each position in selecting nip, all corresponding one is subjected to the open circuit force value of control of switch, and promptly pot inner pressure is controlled in switch when opening circuit on the pairing pressure.Switch is subjected to the active force of spring leaf to be off state in region of no pressure, when pot cover screws to the zero-pressure line, act on the spring leaf to form and make a concerted effort because of it screws the pairing height value of displacement, make switch be channel status, after boosting in the pot then with the difference realization of the elastic displacement that screws displacement and pot cover of pot cover control to switch on and off.

The present invention proposes to realize that with flexible member pot cover and the elasticity of pot body on mechanics are screwed together.Flexible member is arranged between the bottom and the outer support of pot of pot tooth coil, its stationary end and the outer support fixation of pot, the bottom of shift end and pot tooth coil is fixed.The outer rigid structure that is meant at pot external body propagation function setting, that have power that supports of described pot, it can carry and transmit thousands of newton's power.Described flexible member be meant make with elasticity good metal material, produce relative displacement, the technical unit that this displacement promptly resets after pot inner pressure disappears in that deformation takes place between its stationary end and the shift end under the effect of pot inner pressure.Described flexible member stationary end is meant the end of flexible member with respect to the outer supported in rest of pot, promptly with an end of the outer support fixation of pot.Described flexible member shift end is meant that flexible member with respect to the outer support of pot one end of elastic displacement can take place, promptly with the fixing end of pot tooth coil.Because flexible member is fixedlyed connected with pot tooth coil, and pot cover is screwed together with the pot tooth coil rigidity, therefore the elastic displacement that flexible member produces under pot inner pressure is passed to pot cover, make it have the feature of following the flexible member elastic displacement, this feature is used as driving switch and produces the pressure release slit, the former is as driving switch control pot inner pressure, and the latter is limited on the force value when producing the pressure release slit as driving sealing ring with the maximum pressure in the pot.So the elastic displacement of described pot cover is actually the rigid of transmission of the elastic displacement of flexible member.The position is set also can selects of the stationary end of flexible member and shift end, when shift end last, stationary end is the stretching shape in following time when flexible member is stressed, on the contrary flexible member is the compression shape when stressed.Flexible member can adopt the arc corrugated board structures, and two or more identical arc-shaped wave cards support the outside outside pot uniform, just forms described arc corrugated board structures.The architectural feature of arc-shaped wave card is: have vertical ripple on the square plate, it laterally has and the equipped mutually arc of the outer external diameter that supports of pot.The arc-shaped wave card can be realized one-shot forming on technology, it has good elasticity, rigidity, stability and processability.Flexible member also has multiple version available: a. coil spring combining structure.Described coil spring combination is meant in the space of supporting outside pot between upper outside and the lagging casing, the several cylinders helical spring is set forms the coil spring combining structure, one end of coil spring combination is a stationary end with the outer support fixation of pot, and the other end and pot tooth coil are fixed into shift end.B. flat spring makes up structure.Described flat spring combination is by several plate spring groups hard board spring assembly structures, pot is outer to be supported in the outer space because flat spring is arranged on, thus each flat spring all should have with pot outer support radian that external diameter matches and with identical lift angle be distributed on the outer support of pot around.The bottom of flat spring is connected to stationary end with the outer support fixation of pot, and top and pot tooth coil are fixedly connected into shift end.Flexible member can also have other version, but its position concerns, annexation, and it all is identical that the transfer characteristic of active force etc., particularly elastic displacement are fastened with the pass of pot inner pressure.The kind of flexible member is selected, and need satisfy driving switch control pot inner pressure and superpressure pressure release and guarantee two safe specification requirements.Need explanation, in the transmission link of all power of the present invention, only strong two ends by flexible member just produce elastic displacement, and all the other are the rigid of transmission of power, the elastic displacement of pot cover as described, elastic displacement of sealing ring or the like all are the rigid of transmission of the elastic displacement of flexible member.

The present invention proposes to adopt the heat expansion type sealing ring to realize being tightly connected of pot cover and pot body, and the sealed diameter of sealing circle makes it to exist seal clearance less than the diameter dimension at sealing position under the normal temperature.Hot gas is constantly discharged from seal clearance when heating in the pot, and before kettle temperature reached the water saturation boiling, the sealing ring expanded by heating put in place and fills up seal clearance realization sealing, can save float-type air bleeding valve of the prior art according to this.In view of the elasticity connection features between pot cover and the pot body, being tightly connected between them has the movable sealing connection features.Under the effect of pressure, pot cover had relative up and down displacement with a pot body, also is referred to as reciprocating type movable sealing when described movable sealing connection was meant sealing.Is connected and the movable sealing connection features with the elasticity of pot between the body based on pot cover, under the effect of pot inner pressure, pot cover has relative elastic displacement with a pot body, and this displacement is finished pressure controls except that driving switch, also makes the present invention have relief type pressure release function.Described relief type pressure release is meant when pot inner pressure surpasses the service pressure scope for some reason, and the elastic displacement between pot cover and the pot body can be above the sealing range of sealing ring, makes it to produce slit " unnecessary " pressure of releasing.Described relief type is meant in the process of unnecessary pressure of releasing, along with the flexible member slit that resets gradually also reduces gradually, when the unnecessary pressure of releasing disappears pressure release is stopped in the slit during to working pressure range.Described sealing range is meant that sealing ring keeps the pairing pot inner pressure scope of movable sealing, under the situation of other parameter constant, determines in pot body mouth upright position all that by sealing ring the pressure release phenomenon then appears at the increasing diameter general goal of seal ring displacement to the pot edge.

Pot inner pressure of the present invention control, the automatic control system of being made up of by sealing ring, flexible member, the outer support of pot, electric heater and switch module etc. pot cover and pot body is finished.A road of pot inner pressure is delivered to pot tooth coil from pot cover, is delivered to the shift end of flexible member again from pot tooth coil; Another road of pot inner pressure is delivered to the stationary end that the upper surface of supporting outside the pot is delivered to flexible member again from the lower surface of pot body pot edge.Switch module just is arranged between the shift end and stationary end of flexible member.Switch in the switch module, electric heater and power supply are connected into series circuit, electric heater makes in the pot pot body heating and boosts when switch ways, when pot inner pressure was raised to elastic displacement driving switch that pot cover screws the pairing force value of displacement, pot cover and opens circuit, electric heater then stops to the pot body heating to be made and enters the step-down state in the pot.And the elastic displacement that drops to pot cover when pot inner pressure is when making switch ways, and electric heater begins again heating in the pot ... so circulation, and pot inner pressure just is controlled in pot cover when screwing displacement on the selected numerical value.The control mode of above-mentioned pot inner pressure belongs to the high temperature controlling temp type, and described high temperature temperature control is meant pot inner pressure is controlled on the selected force value always, based on the correlation of pressure and temperature, has controlled pot inner pressure and has also promptly controlled kettle temperature.If switch adopts bistable, then when pot inner pressure reaches setting value for the first time, the elastic displacement that pot cover is followed flexible member just driving switch makes it be converted to off state from channel status, electric heater promptly stops the heating to the pot body, though then pot inner pressure causes flexible member to reset because of natural heat dissipation reduces, but the bi-stable character of switch makes it continue to keep off state, and pot inner pressure is the nature buck and successively decreases.Above-mentioned pot inner pressure control mode belongs to high temperature and protects hot type.Described high temperature protect heat be meant when pot inner pressure also be to stop the heating kettle body after temperature reaches set point value, slow down the interior natural rate of temperature fall of pot with the means that keep heat and finish culinary art.

Pressure cooking time control of the present invention is finished by electronic timer.Electronic timer comprises the time switch of cutting off the electricity supply when sets of contacts, display screen and culinary art finish.Display screen can show that culinary art kind, time etc. and indication culinary art finish.Sets of contacts screws the position, receives the plurality of contacts that pot cover screws displacement and form by being arranged on pot cover.Each of pot cover screws displacement, and the timing time limit that a pair of contact comes corresponding electronic timer all is set, and makes the displacement that screws of pot cover realize screwing to touch being connected with the selection of time of electronic timer by sets of contacts.Described screwing touched connection, is meant that the displacement that screws with pot cover touches the soft-touch control that the contact of electronic timer is formed, and realizes being connected of machinery and electrical equipment.The break signal first time with switch starts electronic timer, beginning calculating pressure cooking time.When the selected culinary art concluding time then, the time switch of electronic timer just cuts off the power supply of electric heater.Each of pot cover screws displacement, and the cooking time of a not only corresponding pot inner pressure but also a corresponding setting is with the purpose that the selected culinary art of displacement " duration and degree of heating " can realize not having the button operation that screws of pot cover." fire " in the described culinary art duration and degree of heating promptly is pot inner pressure, and " time " then refers to cooking time.

The present invention proposes between the shift end of flexible member and stationary end switch module to be set, and described switch module comprises switch, pressure regulator, fixture, spring leaf, insulation support and selects casting die.Wherein switch can be chosen the normally closed type quick-action switch, and it is made up of pair of contact.Pressure regulator is one group of helicitic texture that is used for by-pass cock break-make point position, in order to limit a maximum working pressure in the pot.Fixture, spring leaf, insulation support and select the effect of casting die, are with elastic displacement and screw the displacement insertion switch.Fixture is as switch module is fixed on the stationary end of flexible member.One end of spring leaf is fixed on the stationary end with switch module, and the other end is by insulation support and control switch, and the elastic force of selected spring leaf makes the normally closed type switch be in off state.Select an end of casting die and the far-end of spring leaf to fix, what the other end was accepted the oblique tooth of pot cover screws the pairing height value of displacement.When selecting casting die to accept pot cover and pot tooth coil to screw the height value variable of displacement process, because pot inner pressure is passed to the pot cover edge, the size of its power is in thousands of newton's magnitude, and the power that promotes spring leaf and switch 10 newton only, therefore, when selecting casting die introducing pot cover to screw height value, only need to consider relevant height dimension, and need not pay close attention to the size of transmission power.During work, after pot cover screws in the zero-pressure line, select casting die promptly to accept pot cover and screw the pairing vertical height of displacement, force spring leaf to make switch be converted to channel status from off state.Select the power transfer mode of casting die to should be rigid of transmission, described rigid of transmission is meant the far-end that displacement is delivered to spring leaf that screws from pot cover, does not produce the height value error because of above-mentioned transmittance process.The displacement correspondence that screws of pot cover selected pot inner pressure, this screw displacement the corresponding tiltedly height value of tooth, by selecting casting die to be delivered to the far-end of spring leaf, pass to switch through the insulation rigidity of support.In sum, the pot inner pressure correspondence the elastic displacement of the vertical direction of flexible member, this elastic displacement arrives pot cover by the rigid of transmission of oblique tooth, when selecting casting die to accept the elastic displacement of lower edge, lid limit of pot cover, also will be according to height value by the vertical direction that screws the pairing pot cover of displacement of pot cover.Therefore, select that casting die accepts to be the vertical displacement of flexible member with oblique tooth height value that pot cover screws displacement poor, the elastic displacement that screws displacement and pot cover of abbreviation pot cover poor.The difference of above-mentioned displacement acts on selects casting die, spring leaf, insulation to support the break-make of controlling switch.Why the feature of above-mentioned power emphasizes it is rigid of transmission, is for fear of transmission error.By the pressure regulator on the switch module, the selected interior maximum pressure value of the pairing pot of pot cover maximum angular that screws.

The transitive relation of " power " of the present invention, the annexation between the parts and electrical equipment annexation further specify as follows: pot cover and pot tooth coil are screwed together, flexible member is arranged between pot tooth coil and the outer support of pot, flexible member one end is fixedly connected into shift end with pot tooth coil, the other end becomes stationary end with the outer support fixation of pot, and above-mentioned annexation makes between pot cover and the pot body and forms the elasticity relation of being screwed together; Switch module is arranged between the stationary end and shift end of flexible member, selects casting die and pot cover lid lower edge, limit rigidity to touch to be connected in the switch module; Pot cover is realized being tightly connected by sealing ring with the pot body; The pot body is arranged on and realizes the connection of conducting heat on the electric heater; The pot edge of pot body is sitting on the outer upper surface of supporting of pot and realizes the rigid of transmission that pot inner pressure supports outside pot from the pot body; Electric heater is fixed with the outer bottom of supporting of pot; The sets of contacts of pot cover and electronic timer is touched connected mode and is realized dynamo-electric the connection to screw; Switch in power supply and the switch module, electric heater and time switch are connected into series circuit; Switch in switch module break signal startup for the first time electronic timer picks up counting, and time switch was just cut off the electricity supply and finished culinary art when timing finished; Display screen shows that then culinary art kind, time and indication culinary art finish.

Two kinds of pot inner pressure control schemes that the present invention proposes are compared from structure, insulation cover are set for the high temperature controlling temp type not necessarily, and high temperature is protected hot type then must be provided with insulation cover.And the difference on the switch is that the former adopts monostable switch, and the latter then adopts bistable switch.If at the movable contact position of monostable switch one group of little magnet steel is set, also can becomes bistable switch.

Movable step-down window is set on the insulation cover above the pot cover, is convenient to by opening pot cover after water spray, the spraying step-down.Below around the pot body portion, reaching insulation cladding is set, is used to slow down rate of heat loss falls.Between insulation cover and insulation cladding neck ring is set, this neck ring is the connector between insulation cover and the insulation cladding, and the present invention proposes neck ring and is set to movablely, is beneficial to open neck ring and cleans dirt below the pot tooth coil.

Pot body of the present invention can also adopt materials such as pottery, boccaro, glass except that adopting the metal material making.Concentrate for stress in the transmittance process of avoiding power, be provided with equal power pad in the lower surface of pot body pot edge.

In sum, a kind of electric heating pressure cooker, comprise pot cover, sealing ring, the pot body, pot is outer to be supported, electric heater, switch, pot cover is realized sealing by sealing ring and pot body, the pot body is arranged on the electric heater, switch, electric heater and power supply are connected into series circuit, it is characterized in that: pot cover and pot tooth coil are that rigidity is screwed together and realize that by flexible member and pot body elasticity is screwed together, the elastic displacement that flexible member produces under the pot inner pressure effect is passed to pot cover, utilize the break-make of difference driving switch assembly of the elastic displacement that screws displacement and pot cover of pot cover, the control electric heater is realized the automatic control to pot inner pressure to the heating situation of pot body.

Defectives such as beneficial effect: the present invention proposes a kind of electric heating pressure cooker, and it can realize high temperature controlling temp type pressure cooking and high temperature guarantor hot type smoldering culinary art, and the cooking temp that has overcome existing thermos-cooker product existence is low, cooking time is long.The interior technical scheme of cooking pressure and cooking time of pot is selected in its displacement that screws with pot cover, not only makes operation accurate and easy more, also makes product more meet the demand of appearance design and complete machine design.The present invention is directed to the button tooth mode that screws of prior art, fasten the space because of pot tooth and pot tooth are with reserving, make the angle (i.e. pot tooth angle) of two end points and the line of centres of pot tooth less than 30 ° defectives, take technical scheme that oblique tooth arc length is extended, make oblique tooth angle greater than 30 °.Providing oblique tooth angle in an embodiment and be 70 ° long arc tooth is more convenient for screwing choosing and presses.By multi-thread thread design, under the identical condition of pot tooth quantity, the fastening arc length of pot tooth and Gai Ya screws manner than flat tooth and can double with oblique tooth.Select the long arc tooth that the displacement that screws of pot cover is strengthened, not only reduce and close the error that the lid choosing is pressed, also increased considerably the intensity of pot tooth and Gai Ya, thereby reduced the material consumption of pot cover and pot tooth coil.The present invention proposes region of no pressure to be set and to select nip in screwing the choosing pressure, make oblique tooth when pot inner pressure is zero, just have engagement arc length from the initial position that screws to the zero-pressure line, make it possess enough pressure bearing capacitys, can save according to this to close and cover the safety device that puts in place.In the ZL98100976.X patent, owing between the crimped lid tooth of elastic cover, connect with limit tooth transition on the pot cover limit, the design of long arc tooth is adopted in the bearing diagonal inconvenience of its limit tooth transition, can only increase arc length to reduce pot tooth quantity, but this way can make pot tooth intensity descend.Adopt rigidity pot cover of the present invention and long arc tooth design thereof, can avoid the inherent shortcoming of above-mentioned elastic cover crimped lid tooth.Screw togather feature with pot cover long arc of the present invention, realize realizing selecting the culinary art duration and degree of heating not have the technological progress of buttonization in view of the above to screw the highest culinary art pressure and cooking time in the selected pot of displacement.In patent of invention ZL98100976.X, adopted the scheme of pot tooth double as flexible member,, be difficult to the departure of pot inner pressure is controlled in the scope of setting effectively because of being subjected to the limitation of displacement.Based on its pot cover of pressure release purpose of safety also double as flexible member, make the problem of displacement deficiency more outstanding.At the problems referred to above, the present invention adopts and is provided with independently that flexible member makes pot cover possess the elastic displacement feature, and utilizes culinary art pressure in this elastic displacement control pot and limit the technical scheme of maximum pressure in the pot.This flexible member can be avoided the above-mentioned deficiency of existing patented technology fully at aspects such as selection, moulding, heat treatment, costs, has more performance price ratio.Compare with the position that is provided with of ZL91100026.7 patent elastic arm, the flexible member that the present invention proposes is provided with the position, and the height space in better Position Design space, particularly vertical direction is arranged.The present invention is provided with automatic control and the over-pressure self-discharging formula voltage limiting mode that flexible member independently helps pot inner pressure and guarantees safety, because pot cover adopts rigid design not to be subjected to the limitation of double as flexible member, makes it that more selection arranged on material, physical dimension.And rigidity pot tooth is owing to without the double as flexible member, can realize oblique tooth function better.Step-down window, movable neck ring that the present invention proposes can both be the commercialization of patent family technology, and outstanding design condition is provided.Proposition leaves the heat expansion type movable sealing of seal clearance, in saving air bleeding valve, adaptation movable sealing better practicality is arranged.

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is a kind of structural representation of electric heating pressure cooker

Fig. 2 is Figure 1A to the turn clockwise schematic diagram of 90 ° of views of part, Fig. 2 double as Figure of abstract

Fig. 3 is the local schematic top plan view of long arc type pot tooth coil

The schematic diagram of Fig. 4 switch module part

Fig. 5 is a nonmetal pot body pot edge partial schematic sectional view

13. insulation of 6. pots of outer support 7. electric heaters 8. switch modules 9. switches 10. pressure regulators 11. fixtures 12. spring leafs of 3. pots of bodies of 1. pot covers, 2. sealing rings, 4. pot tooth coils, 5. flexible members are supported 14 and are selected casting die 15. insulation covers 16. insulation claddings 17. step-down windows 18. knobs 19. electronic timers 20. sets of contacts 21. time switches 22. display screens 23. neck rings 24. equal power pads among the figure

The left side is the complete section schematic diagram in Fig. 1, and sealing ring 2 usefulness mechanical means are suspended on pot cover 1 last figure part omitted.The right side is that the position of supporting 6. flexible members 5 and switch module 8 after insulation cladding 16 complete sections outside the pot concerns schematic diagram, the position of oblique tooth in the oblique dotted line signal pot cover 1 on the right side pot cover 1.

Pot cover 1 adopts dextrorotation and insulation cover 15, knob 18 to be assembled into one in Fig. 2, pot cover 1 insulation lid 15 among Fig. 2 hides, knob 18 is in initial position, turn clockwise from initial position: 0 is the zero-pressure line, selecting the nip angle is 55 °, the numerical value of

designation number

20,40,60,80,100 expression pot inner pressure kPa to maximum angular from the zero-pressure line in selecting nip, sets of contacts 20 is hidden in the relevant position and does not draw.

Be the schematic diagram of the A of pot tooth coil 4 in Fig. 1 to partial view in Fig. 3, tiltedly the angle of tooth is 70 °, and 5 pot teeth are uniform, the dextrorotation of pot tooth, 1.3 ° of lift angles.

Switch module 8 employing fixtures 11 are fixed on and support outside the pot on 6 in Fig. 4, support 13 transmission by selecting casting die 14, spring leaf 12 and insulation, accept the displacement that screws of pot cover 1.The lid limit bottom line of pot cover 1 illustrates that with a horizontal line switch 9 is a monostable normally closed type switch.

Fig. 5 be nonmetal making the pot body 3, the lower surface, pot edge inlay equal power pad 24 with the pot outside the support 6 schematic diagrames that engage.

Realize the best way of invention: embodiment 1 is for can explain implementation detail in an embodiment quantitatively, and the described electric heating pressure cooker of present embodiment is an example with pot body bore 20cm.The pot inner pressure control mode of present embodiment is the high temperature controlling temp type.Embodiment illustrated in fig. 1ly form with the pot body portion by pot cover part.The cooker cover portion branch comprises: pot cover 1, insulation cover 15, step-down window 17, knob 18, sealing ring 2 etc.Pot cover thickness is that the corrosion resistant plate making about 0.8mm can obtain required rigidity.Uniform 5 the lid teeth of pot cover 1 periphery, the angle of each lid tooth is 70 °, initial position to zero-pressure wire clamp angle is 15 °, lid tooth dextrorotation lift angle is about 1.3 °, selecting the nip angle is 55 °, select the oblique about 2.5mm of tooth maximum height difference in the nip, the lid tooth of pot cover 1 and the engagement place average diameter of pot tooth coil 4 are about 226mm.Insulation cover 15 adopts the high-temperature resistance plastice of the about 2mm of average thickness to make, and leaves in order to slow down the air gap of heat emission rate between insulation cover 15 and the pot cover 1.Step-down window 17 be arranged on insulation cover 15 centres can the activity folding little window, open step-down window 17 and can spray to pot cover 1, spray water to reduce pot inner pressure.The resistant to elevated temperatures plastics of knob 18 usefulness are made, and are assembled into one with pot cover 1, insulation cover 15, and it is as the indication of the handle double as culinary art duration and degree of heating that screws the pot cover part, and for meeting the appearance design needs, knob 18 also can be made one with insulation cover 15.Sealing ring 2 adopts high quality silicon rubber to make, and it should be designed to line with the contact site of pot cover 1, pot body 3 and contact.Seal clearance under the normal temperature (being semidiameter) can be selected in about 2mm, and promptly the sealed diameter under its normal temperature is about 196mm, and available mechanical means is suspended on the sealing position of pot cover 1 with it.

The pot body portion comprises pot body 3, pot tooth coil 4, flexible member 5, the outer support 6 of pot, electric heater 7, switch module 8, insulation cladding 16, electronic timer 19, neck ring 23 etc.Pot body 3 available thickness are that high-quality aluminium sheet about 2.7mm is made in the enforcement, and bore is 200mm, but the about 8mm of bottom of pot body epirelief so not only was beneficial to stressed but also is beneficial to heat transfer.For saving material, the bucket wall part of pot body 3 can adopt ironing technology, and its inwall can adopt non-sticking lining technology.The bimetal leaf warmer that electric cooker is used can be made into switch module 8 through repacking, and reservation monostable normally closed switch wherein is as switch 9.Remove the bimetal leaf of warmer, and to load onto with thickness in situ be the spring leaf 12 that the high-quality corrosion resistant plate about 1mm is made.The end apparent size of spring leaf 12 can be close with former bimetal leaf, is about 10mm but need to add beyond the fulcrum of insulation support 13, is convenient to fixedly select casting die 14 to accept the height and position value of pot cover 1.Choose the about 2.5mm of vertical displacement amount of spring leaf 12 far-ends, this numerical value should with select the oblique tooth effective depth value in the nip suitable.The elastic force that regulating spring sheet 12 makes progress, switch 9 was in off state when pot cover 1 was screwed before the zero-pressure line.When pot cover 1 screws when selecting in the nip, the switch 9 of monostable promptly is in normally off.After pot cover 1 was opened, the monostable normally off of switch 9 was converted to off state again under the effect of spring leaf 12.Temperature adjustment screw on the former warmer can be used as pressure regulator 10, as maximum working pressure value in the disposable setting pot before the product export.Fixture 11 usefulness Stainless Steel plates are made, and pot is outer to be supported on 6 as stationary end in order to switch module 8 is fixed on.Ceramic insulation on the former warmer supports to continue to employ does insulation support 13, realizes the rigid insulation transmission of displacement force.Select casting die 14 usefulness stainless steels to make, the one end is fixed on the far-end of spring leaf 12, and what the other end was accepted pot cover 1 lid lower edge, limit screws the displacement height value, and promptly pot cover 1 screws selected pot inner pressure value.Pot tooth coil 4 usefulness thickness are that the high-quality corrosion resistant plate making about 1mm can obtain required rigidity, the lid tooth of parameters such as the lift angle of its pot tooth, arc length and pot cover 1 matches, can select about 4mm with the engagement radial width of lid tooth, the height dimension of pot tooth coil 4 needs to satisfy and the fixedlying connected of flexible member 5, and can select about 25mm.Flexible member 5 available thickness are that the high-strength stainless steel sheet about 0.8mm processes, by two (or a plurality of) identical arc-shaped wave card be distributed on pot outer support 6 around, form the arc corrugated board structures.The size of ripple is formed by connecting by close circular arc R size in the enforcement, recommends arc size R4mm～R8mm, and the ripple number can be selected between 1～4.The arc length of arc corrugated board structures is to the parameter influence maximum of its elastic displacement, adjust its arc length with process means and determine that the elastic displacement parameter of flexible member 5 is simple and feasible, the arc length of arc-shaped wave card is less than outer 1/2 (or the part) of supporting 6 external diameter girths of pot among Fig. 1.The arc-shaped wave card made from elasticity good metal thin plate, but one-shot forming on technology can have better elastic, rigidity, stability and processability through temper.Here recommend the design parameter of flexible member 5 to be: displacement is about 2mm during pot inner pressure 100kPa, and the displacement parameter 2mm of this displacement parameter and switch 9 matches.In force, the maximum flexibility displacement of flexible member 5 should be not less than 3mm, and wherein in order to the control pot inner pressure, the displacement of 2.5～3mm is guaranteed safety in order to over-pressure self-discharging to 2mm with interior displacement.If the complete machine design needs, pot tooth coil 4 and flexible member 5 can be made one.The bottom of the upper end of flexible member 5 and pot tooth coil 4 is fixed as shift end among Fig. 1, and the lower end of flexible member 5 is fixed as stationary end with the outer support 6 of pot, and such connected mode is drawing, because of flexible member 5 stressed backs produce stretching displacement.Select compression---compression displacement as desire, the top of flexible member 5 can be changed into stationary end fixes with the outer support 6 of pot, the bottom of the pot tooth coil 4 behind the increase height and the bottom of flexible member 5 are fixedly connected into shift end, between the bucket wall of this shift end and the outer support 6 of pot the gap of being convenient to top offset should be arranged.In the space of two arc-shaped wave cards, switch module 8 can be set.Outer 6 modes that can continue to use the electric cooker outer pot that support of pot are made, and are the steel plate drawing and forming about 0.6mm and make anti-corrosion treatment with thickness.Be to save material, can also with arc-shaped wave card matching design, make by 2 gripper shoes and form, meet the outer support 6 of pot of force request.Electric heater 7 can adopt the cast aluminium electrothermal tube structure, and electrical power is selected in about 750W, and its upper surface should have the identical epirelief shape in the bottom of a pan with pot body 3, and gross mass should be controlled in the 250g, to reduce the influence of its thermal inertia to pressure control sensitivity.The radiant heater that it is 750W that electric heater 7 also can be selected electrical power, made by equipped heat resistant glass plate on the infrared heating pipe, the upper surface of its heat resistant glass plate can leave several mm clearance with the bottom of pot body 3, and the efficiency of heating surface height of radiant heater, thermal inertia are little.Insulation cladding 16 usefulness plastics or plastics and metallic combination are made, and in order to keep heat, its upper end is fixed with the vertical component of pot tooth coil 4.Apparent connector between insulation cover 15 and the insulation cladding 16, the available movable neck ring of making by high-temperature resistance plastice 23, the vertical component of it and pot tooth coil 4 is fixed, and pot tooth coil 4 capable of washing opens it.Insulation cover in appearance 15, neck ring 23 and insulation cladding 16 at product form one, and they do not participate in the displacement under the pressure.The electronic timer 19 optional electric time-keeping chips of using, display screen 22 can be selected LCDs for use, and time switch 21 adopts noncontacting switch.Display screen 22, time switch 21 are installed on the circuit board with the electric time-keeping chip, are fixed on the appropriate location of insulation cladding 16 or neck ring 23.Time switch 21 is connected in the lump with switch 9, electric heater 7 and is inserted power supply.Before the timing time limit of electronic timer 19 finished, time switch 21 was the original via state, and regularly time switch 21 opens circuit after the time limit end.The timing time limit of electronic timer 19 is provided by sets of contacts 20, just picks up counting when switch 9 is opened circuit by the elastic displacement driving for the first time.Sets of contacts 20 is made up of 10 left and right sides soft-touch controls, is arranged on to screw on the position that displacement can touch.Each soft-touch control is according to the timing time limit of its representative, with select nip in the different corresponding settings of pot inner pressure value.With in selecting 55 ° of angles of nip, it is example that 10 soft-touch controls are set, because of its representative be regularly the time limit, so zero-pressure line place is not provided with, all the other are distributed on selects in the nip.Be limited to 60min when selecting the maximum timing, select 55 ° of angles of nip to represent pot inner pressure 0～100kPa, pot cover 1 whenever screws 5.5 °, and the pressure in the pot is controlled just increases 10kPa, and the time is controlled increase 6min.According to this, can screw the angle (see figure 2) according to what food variety was determined pot cover 1.

The course of work of embodiment 1 is as follows: food and water are put into pot body 3, pot body 3 is placed on the electric heater 7 again, screw pot cover 1 to the choosing corresponding with this food and press on the angle.After connecting with the mains, switch 9 and time switch 21 are path, food and water in the electric heater 7 heating kettle bodies 3.In temperature-rise period, heated steam and air are constantly arranged, the seal clearance between sealing ring 2 and sealing position is discharged outside the pot.Before kettle temperature rose to the water saturation boiling, air all was discharged from outside the pot in the pot, and expansion was promptly filled up seal clearance and realized sealing after sealing ring 2 was heated.After the sealing, continue to heat up produce pressure in the pot, this pressure one road is delivered to the pot tooth of pot tooth coil 4 from the lid tooth of pot cover 1, is delivered to the shift end of flexible member 5 by pot tooth coil 4, and the shift end that makes flexible member 5 is to top offset.Another road to electric heater 7, is delivered to outer 6 the bottom of supporting of pot from the bottom of pot body 3 again.Above-mentioned for pot inner pressure rises to the transmission situation of 10kPa left and right sides Shi Li, also be that electric heater 7 is distinctive when adopting the cast aluminium electrothermal tube structures.Can produce the working height error problem in the batch process of product, the working height error is meant the outer accumulation of error that supports the relative dimensions such as height of 6 height and electric heater 7 of height, the pot of pot body 3.For guaranteeing the thermo-contact of electric heater 7 and pot body 3, the height dimension that must control pot body 3 is a plus tolerance.Like this, in pot during zero pressure, between the upper surface of the lower surface, pot edge of pot body 3 and the outer support 6 of pot, have the height tolerance gap about 2mm, this gap can be by outer transition size---the elasticity that circular shape had that supports the vertical direction of 6 bottoms to horizontal direction of pot, and what take place when the pot inner pressure 10kPa left and right sides eliminates to bottom offset.After this pot inner pressure that continue to raise relies on this path: pass to the outer support 6 of pot from the pot edge of pot body 3, be delivered to 5 stationary end of flexible member again.Pot inner pressure acts between the shift end and stationary end of flexible member 5, also act on the switch module 8 that is fixed between stationary end and the shift end, switch 9 is subjected to the driving of elastic displacement, controlling the heating situation of 7 pairs of pot bodies 3 of electric heater, pot inner pressure is controlled in screwing on the selected force value of displacement of pot cover 1.When arriving the culinary art concluding time that electronic timer 19 is set, time switch 21 is just cut off the electricity supply.Open pot cover 1 immediately as desiring, need open step-down window 17 step-down of spraying, spray water earlier.If electric heater 7 adopts radiant heater in an embodiment, have only radiant heat transfer not have contacting of power between pot body 3 and the electric heater 7, therefore, pot inner pressure just supports 6 upper surface at the beginning outside pot is directly passed in the pot edge of pot body 3, also just do not had above-mentioned working height error problem certainly.

Embodiment 2 is referring to Fig. 1, and the pot inner pressure control mode of present embodiment is that high temperature is protected hot type.Switch 9 adopts bistable, can directly select suitable bistable switch for use in the enforcement, also the monostable normally closed switch among the embodiment 19 can be used through after repacking bistable state into, method of modifying is between the movable contact of switch 9 in the circle 4 and the fixed structure a suitable permanent-magnet steel group to be set, this permanent-magnet steel group by up and down 2 form, each fixing a slice on the relevant position of movable contact and fixed structure, when switch 9 is channel status, 2 separation of this permanent-magnet steel group, and when switch 9 is off state, 2 adhesives of this permanent-magnet steel group, after this homing action of flexible member 5 does not influence the attracting state of permanent-magnet steel group, and promptly switch 9 is in permanent off state.Starting first then of switch 9 can separate 2 magnet steel of the adhesive on the switch 9 by the placement action of pot body 3, and switch 9 promptly is transformed into the path situation from off state.The feature of embodiment 2 is: when switch 9 is subjected to the driving of elastic displacement, by path be converted to open circuit after, switch 9 just is in permanent off state, slows down the changing down of pot inner pressure in the mode that keeps heat, realizes that with this high temperature protects the hot type culinary art.Difference from Example 1 also is insulation cover 15, and embodiment 2 requirements must be provided with insulation cover 15 on pot cover 1, if desired also can be between insulation cover 15 and pot cover 1 filled heat insulating material.Embodiment 2 has culinary art low feature of the relative embodiment of pot inner pressure 1 when finishing, and helps opening pot cover 1 after the culinary art.

Embodiment 3 a kind ofly uses pot body 3 instead scheme that pottery, boccaro, glass are made, in the hope of special cuisine flavour.Its architectural feature is that the lower surface, pot edge of pot body 3 is inlaid with equal power pad 24 with pot contact site, upper surface of outer support 6, and this equal power pad 24 is made by rubber, plastics or softer metals.All the other structure reference examples 1 of embodiment 3, the control scheme of its pot inner pressure can be identical with embodiment 2.

In sum, a kind of electric heating pressure cooker, comprise pot cover 1, sealing ring 2, pot body 3, pot is outer to support 6, electric heater 7, switch 9, pot cover 1 is realized sealing by sealing ring 2 and pot body 3, pot body 3 is arranged on the electric heater 7 switch 9, electric heater 7 is connected into series circuit with power supply, it is characterized in that: pot cover 1 is with pot tooth coil 4 that rigidity is screwed together and realize that by flexible member 5 and pot body 3 elasticity are screwed together, the elastic displacement that flexible member 5 produces under the pot inner pressure effect is passed to pot cover 1, utilize the break-make of difference driving switch assembly 8 of the elastic displacement that screws displacement and pot cover 1 of pot cover 1, the heating situation of 7 pairs of pot bodies 3 of control electric heater realizes the automatic control to pot inner pressure.

The pot tooth of the lid tooth of pot cover 1 and pot tooth coil 4 all adopts the oblique tooth of long arc, and all has identical little lift angle, and the angle of its oblique tooth arc length correspondence is worked energetically 30 °.Screwing in the scope with the zero-pressure line at pot cover 1 is that the boundary is provided with region of no pressure and selects nip.There is seal clearance at normal temperatures between sealing ring 2 and its sealing position, expands after sealing ring 2 is heated and fill up gap realization sealing.Flexible member 5 can be the arc corrugated board structures, or coil spring combining structure or flat spring combination structure.Switch module 8 mainly comprises and selects casting die 14, spring leaf 12 and switch 9; Switch 9 can be monostable or bistable.Pot cover 1 screws to touch with electronic timer 19 by sets of contacts 20 and is connected.In the outside of pot tooth coil 4, be provided with movable neck ring 23.Adopt the lower surface, pot edge of the pot body 3 of nonmetallic materials making to be provided with equal power pad 24.Electric heater 7 can be aluminium electric hot tray or infrared heater.

Claims

1. electric heating pressure cooker, comprise pot cover (1), sealing ring (2), pot body (3), outer (6), electric heater (7), the switch (9) of supporting of pot, pot cover (1) is realized sealing by sealing ring (2) and pot body (3), pot body (3) is arranged on the electric heater (7), switch (9), electric heater (7) are connected into series circuit with power supply, it is characterized in that: pot cover (1) The lid toothWith pot tooth coil (4) The pot tooth be the oblique tooth of the long arc with identical little lift angle, the twoBe that rigidity is screwed together and realize that by a flexible member (5) and a pot body (3) elasticity is screwed together, the elastic displacement that flexible member under the pot inner pressure effect (5) produces is passed to pot cover (1), utilize the break-make of difference driving switch assembly (8) of the elastic displacement that screws displacement and pot cover (1) of pot cover (1), control electric heater (7) is realized the automatic control to pot inner pressure to the heating situation of pot body (3).

2. a kind of electric heating pressure cooker according to claim 1 is characterized in that: the pot tooth of the lid tooth of pot cover (1) and pot tooth coil (4), the angle of its oblique tooth arc length correspondence is greater than 30 °.

3. a kind of electric heating pressure cooker according to claim 1 and 2 is characterized in that: screwing in the scope with the zero-pressure line at pot cover (1) is that the boundary is provided with region of no pressure and selects nip.

4. a kind of electric heating pressure cooker according to claim 1 is characterized in that: have seal clearance at normal temperatures between sealing ring (2) and its sealing position, expand after sealing ring (2) is heated and fill up gap realization sealing.

5. a kind of electric heating pressure cooker according to claim 1 is characterized in that: flexible member (5) can be the arc corrugated board structures, or coil spring combining structure or flat spring combination structure.

6. a kind of electric heating pressure cooker according to claim 1 is characterized in that: switch module (8) mainly comprises and selects casting die (14), spring leaf (12) and switch (9); Switch (9) can be monostable or bistable.

7. a kind of electric heating pressure cooker according to claim 1 is characterized in that: pot cover (1) screws to touch with electronic timer (19) by sets of contacts (20) and is connected.

8. a kind of electric heating pressure cooker according to claim 1 is characterized in that: the outside in pot tooth coil (4) is provided with movable neck ring (23).

9. a kind of electric heating pressure cooker according to claim 1 is characterized in that: adopt the lower surface, pot edge of the pot body (3) of nonmetallic materials making to be provided with equal power pad (24).

10. a kind of electric heating pressure cooker according to claim 1 is characterized in that: electric heater (7) can be aluminium electric hot tray or infrared heater.