CN2234744Y

CN2234744Y - Electric boiling over-preventing milk-boiling device

Info

Publication number: CN2234744Y
Application number: CN 95216208
Authority: CN
Inventors: 肖跃军
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-17
Filing date: 1995-07-17
Publication date: 1996-09-11
Anticipated expiration: 2005-07-17

Abstract

The utility model provides an electric heater with a power-down protection device, being used for preventing overflow when milk, etc. Are boiling. The container of the electric heater is made of transparent glass; an electric furnace is arranged under the container; completely relative positions on both sides of the container are provided with a pair of ejection type photoelectric switches as the power switch of the electric furnace. When the utility model is used, milk is arranged in the container; the photoelectric switch is switched on because the light is not blocked by the milk, and the electric furnace starts working; the level of the milk rises when the milk is boiled, the light is blocked, and the power supply is cut to prevent the overflow of the milk. The utility model has the advantages of simple structure, convenient use and reliable use.

Description

A kind of electrical milk-boiling device of anti-overflow

The utility model is a kind of invention about the electric heater power-off protection apparatus.

When boiling milk, soya-bean milk etc., must wait for aside, otherwise the liquid in the pot will overflow, the lighter pollutes the kitchen range top, and weight person causes gas leak, short circuit etc., causes danger, so very inconvenient.For addressing this problem, existing a kind of electric heater that has the temperature control power-off protection apparatus on the market prevents that milk from continuing to be heated and overflow thereby cut off the electricity supply when milk temperature reaches boiling point.But because there is individual difference in the performance of temperature-sensitive electronic device own, therefore in fact the operating temperature of power-off protector is an interval, and milk temperature no longer raises when reaching boiling point, thereby the components and parts that operating temperature is above the boiling point will be entirely ineffective, therefore this interval should be lower than boiling point guaranteeing safety, thereby generally is difficult to milk is really boiled; Simultaneously because hot sensing speed slow (overall response time is generally ten seconds levels) adds the loss of heat in the transmittance process, the difficult control of condition of work must reduce the speed that temperature raises artificially, has both influenced operating efficiency, causes heat-energy losses again.Therefore, this mode is difficult to take into account safe and reliable and two aspects of effectively milk boiling being sterilized.

That the purpose of this utility model is to provide is a kind of not only convenient, but also safe and reliable electric heater, is applicable to that milk etc. can stop light and expand anti-overflow when liquid boils faster when boiling.

The purpose of this utility model is achieved in that a transparent glass container [1] is placed on the electric furnace [2], and settles a pair of (or several to) correlation type optoelectronic switch in relative fully position, container [1] the two wall outside, as the power switch of electric furnace [2].Milk is placed container [1] and make liquid surface be lower than the position of the photophore [3] and the light-receiving device [4] of optoelectronic switch, connect with the mains then, in light-receiving device [4] have light irradiation because the light that photophore [3] sends is not blocked this moment, switch is switched on, and electric furnace begins to heat to milk; When milk boiling, liquid level rises, and the light that photophore [3] is sent blocks, and does not at this moment have the light irradiation in the light-receiving device [4], and power supply promptly is cut off, thereby prevents milk from continuing to be heated and overflow.

Advantage of the present utility model is: when not boiled owing to milk, liquid level can not rise, and therefore when power supply was cut off, milk is scalding, thereby very effective; Simultaneously, because the response time of photosensitive components and parts is extremely lacked (being generally the microsecond level), therefore when liquid level rose to the optoelectronic switch place, power supply cut off immediately, and milk can not overflow, thereby safe and reliable; In addition because the utility model is avoided direct serviceability temperature control, can use the design that container and circuit part be separated easily and needn't worry to cause error (because the latter is in order to prevent heat radiation and to improve hot sensing speed because of reasons such as thermal loss in the hot sensing process, generally sensor and container more closely must be bound up, and sealed), thus it is convenient that container is cleaned.

Fig. 1 is a principle schematic of the present utility model.

Illustrated below in conjunction with schematic diagram:

As Fig. 1: represent section in kind than thick lines among the figure, then represent circuit or liquid surface when using than hachure, light direction of illumination in arrow [5] the expression optoelectronic switch.[1] is Heated container, it is a cylindrical transparent glass vessels, place above the electric furnace [2], the photophore of optoelectronic switch [3] is placed on relative position (aperture A, B have same level height and be lower than the container upper edge) fully, container [1] both sides with light-receiving device [4], put when optoelectronic switch has illumination in light-receiving device and connect, otherwise disconnect.Pour milk during use into and make liquid level be lower than A or B point, connect the 220V AC power at the S place, because the light that sends of photophore [3] is not blocked, the light irradiation is arranged in the light-receiving device [4], thereby switch is switched on, electric furnace begins to heat to milk; When milk boiling, liquid level rises, and light is obstructed in the light-receiving device [4] when rising to the A point, and power supply promptly is cut off, thereby prevents that milk from overflowing because of continuing to be heated.

The optoelectronic switch of mentioning in the technical solutions of the utility model can be bought easily, maybe can make by the way among the following embodiment.

Embodiment of the utility model below is discussed:

Fig. 2 is the line map of the utility model embodiment.

Fig. 3 is the utility model example structure schematic diagram.

As Fig. 3: [5] are the strap clamp layer plastic casing (circuit part can be placed in the interlayer) of cylindricality drum for an inwall; Electric furnace [2] is fixed on the bottom of this drum; [6] be the lid that freely to open; [1] is cylindrical (beaker shape) transparent glass container, is placed on the electric furnace [2], can freely take off (so that cleaning); L ₁, L ₂, L ₃Be three light emitting diodes (as photophore [3]), X ₁, X ₂, X ₃Be three photo resistance (as light-receiving device [4]), be separately fixed at the relative position, inwall both sides of plastic housing, make light emitting diode L ₁, L ₂, L ₃Respectively with photo resistance X ₁, X ₂, X ₃In same level height, and be higher than when filling daily one glass (person-portion), two glasss, three glasss milk in the container [1] 2-3 centimetre of liquid level respectively, make X simultaneously ₃The place is lower than container [1] the about 8-10 in upper edge centimetre; By being arranged on the K switch on the housing face-plate, can select wherein any a pair of photoelectricity lotus root (promptly be in the light emitting diode of same level height and photo resistance to) in running order.

Its circuit theory such as Fig. 2: D is a commutation diode, and electrochemical capacitor C is used to consider ripple; X ₁, X ₂, X ₃Be three cadmium sulphide photoconductive cells, L ₁, L ₂, L ₃Be light emitting diode, can select wherein a pair of accordingly by the double-gate K switch (as X ₁With L ₁Or the like) connect.During work, connect the 220V AC power, as photo resistance X at the S place ₁In when illumination is arranged, resistance value is less, resistance is also just less between d, e, because resistance R ₁The dividing potential drop effect, thereby voltage is also lower, the electric current in the relay J coil is also just less, the suction of generation is less, microswitch is in the state of a, 2 connections of c, thereby load R (electric furnace) connects; On the contrary, work as X ₁In unglazed according to the time; its resistance value is bigger; resistance is bigger between d, e; thereby voltage is also higher; electric current in the relay J coil is also just bigger, and the suction of generation is bigger, promotes microswitch and makes it be in the state of b, 2 connections of c; load R (electric furnace) thus disconnect the purpose reach power-off protection, connect buzzer F simultaneously and report to the police.

Above-mentioned is suitable easily one to three people's use-case.During use, earlier K switch is allocated to the relevant position and (is allocated to when boiling one glass of milk and makes X ₁, L ₁In running order place, or the like), existing hypothesis is boiled three glasss of milk: the glass container [1] that will fill three glasss of milk is placed on the electric furnace [2], cover lid, and toggle switch K is to making X ₃, L ₃In running order, this moment, liquid level was in X ₃Below 2,3 centimeters, connect with the mains, because L ₃The light that sends is not blocked, X ₃In light irradiation is arranged, switch connection, electric furnace begin to heat to milk; When milk boiling, liquid level begins to rise, when rising to X ₃The X during place ₃Middle light is obstructed, and the power supply of electric furnace promptly is cut off, and buzzer begins to report to the police simultaneously, and liquid level will continue several centimetres of risings because of a small amount of waste heat of electric furnace this moment, but owing to leave 8-10 centimetre space in advance, can prevent that milk from overflowing.

Claims

1, a kind of electrical milk-boiling device of anti-overflow, power switch by Heated container [1], electric furnace [2] and automatic disconnection when liquid in containers is boiled is formed, it is characterized in that Heated container [1] is a transparent glass vessels, power switch then is a pair of or several to correlation type optoelectronic switch, and the photophore [3] of optoelectronic switch is placed relative position fully, container [1] both sides respectively with light-receiving device [4].

2, electric heater according to claim 1 is characterized in that Heated container [1] and other parts are separable structure, and other parts then are fixed together.