CN203434086U - Anti-dry temperature sensitive switch for electric heating equipment - Google Patents

Abstract

The utility model provides an electric heating equipment prevent dry combustion method temperature sensitive switch, including power input terminal binding post, power output terminal binding post, the bimetallic strip, the corresponding movable contact and the stationary contact in position, the metal shrapnel, the inner shell, shell and push rod, the push rod is located between bimetallic strip and the metal shrapnel, the bimetallic strip is located the inner shell bottom, and can directly contact with the electric heating device, the one end and the power input terminal binding post rigid coupling of metal shrapnel are on the inner shell, the other end is equipped with the movable contact, the stationary contact is located on the power output terminal binding post, when temperature sensitive switch installs during operation on the electric heating device, the bimetallic strip is with the electric heating device direct contact, when the electric heating device reaches rated temperature, the bimetallic strip kickup promotes the push rod, thereby make the movable contact and the stationary contact disconnection. Because bimetallic strip and electric heating element direct contact, its temperature-sensing is more sensitive, and the reaction action is more rapid, more can improve and prevent dry combustion method guard action, improve the security performance.

Description

The anti-dry temperature-sensitive switch of electroheat equipment

[technical field]

The utility model relates to temperature detect switch (TDS), particularly relates to a kind of anti-dry temperature-sensitive switch of electroheat equipment.

[background technology]

Along with the raising of people's living standard, household electrical appliance kind is also more and more, electrical equipment generally to use life to people to bring convenient greatly, if but user lacks Electrical Safety prevents consciousness, it also can bring potential safety hazard to user, causes security incident.For electroheat equipment, as electric cooker, electric kettle, electric heater etc., electrothermal device is generally contained in its inside, as heat-generating disc, fever tablet etc., if allow electrothermal device work under abnormal operating state always, as anhydrous heating, over temperature and heat etc., be easy to cause damage of product because of dry combustion method, even cause fire to occur.Therefore,, for electroheat equipment, it generally need to arrange thermostat and guarantee Electrical Safety.When electrothermal device working temperature is during higher than predetermined temperature, thermostat can automatic shutdown circuit to prevent dry combustion method.Thermostat can prevent that dry-fire condition from occurring to a certain extent, but existing thermostat is because bimetal leaf does not contact with electrothermal device, causes its movement response insensitive, cannot be in time open circuit fast, in the course of time, can accelerate the aging of electroheat equipment equally, cause potential safety hazard.

[summary of the invention]

The utility model is intended to address the above problem, and provide a kind of can fast cut-off circuit when temperature reaches rated temperature to prevent dry combustion method, stable performance, the anti-dry temperature-sensitive switch of safe and reliable electroheat equipment.

For achieving the above object, the utility model provides a kind of anti-dry temperature-sensitive switch of electroheat equipment, it is characterized in that, this temperature-sensitive switch comprises bimetal leaf, metal clips, moving contact, fixed contact and push rod, described bimetal leaf can vary with temperature and be out of shape, and it contacts with electrothermal device; One end of described metal clips is connected with power input binding post, and the other end is free end, and this free end is provided with moving contact; Described fixed contact is located at position corresponding with moving contact on power output end binding post, and described fixed contact contacts and conducting with moving contact when electrothermal device works; One end of described push rod is connected with bimetal leaf, and the other end heads on described metal clips; And when the electrothermal device of electroheat equipment reaches design temperature, described bimetal leaf temperature distortion and being bent upwards, promotes push rod and move upward, make the moving contact and fixed contact disconnection of metal clips end, by circuitry cuts, to prevent electrothermal device dry combustion method.

Described push rod is vertically located between bimetal leaf and metal clips, and its one end is fixed in the middle part of bimetal leaf, and its other end heads on the middle part of metal clips.

Temperature-sensitive switch of the present utility model is also provided with shell and a hollow inner casing that lower end is uncovered, described casing is located at outside inner casing, form a cavity between the two, described metal clips is located in described cavity, power input binding post is fixed on inner casing, one end of metal clips is connected with power input binding post, power output end binding post is fixed in position corresponding with metal clips on inner casing, described bimetal leaf is located at inner casing inner bottom part, one end and the bimetal leaf of described push rod are affixed, and its other end heads on described metal clips through inner casing.

Described inner shell bottom is provided with opening, and described bimetal leaf contacts with electrothermal device by this opening.

The position corresponding with bimetal leaf at inner shell bottom is provided with metal conducting strip, and described metal conducting strip is provided with through hole, and described bimetal leaf is fixed in a side of metal conducting strip, and contacts with electrothermal device by through hole.

The link of described metal clips and power input binding post is affixed or be welded on inner casing by rivet, described moving contact riveted or be welded in the free end end of metal clips, described fixed contact riveted or be welded on power output end binding post, described power output end binding post is affixed or be welded on inner casing by rivet.

One end of described power input binding post and power output end binding post is affixed with inner casing respectively, and its other end stretches out and extends to shell round about from the bottom opening of shell respectively.

Described power input binding post and power output end binding post are scalariform sheet metal.

Described inner casing is made by insulating material.

Useful contribution of the present utility model is, it provides a kind of anti-dry temperature-sensitive switch of safe and reliable, stable performance.The utility model directly contacts bimetal leaf with electrothermal device, make its temperature sense sensitiveer, and the action of cutting off circuit is rapider, thereby can fast, accurately cut off circuit.In addition, that the anti-dry temperature-sensitive switch of electroheat equipment of the present utility model has is simple in structure, cost of manufacture is low, stable performance, responds the features such as sensitive, safe and reliable, easy to implement.

[accompanying drawing explanation]

Fig. 1 is structural representation of the present utility model.

Fig. 2 is temperature-sensitive switch working state schematic representation of the present utility model.

Fig. 3 is operation principle schematic diagram of the present utility model.

Fig. 4 is structural upright schematic diagram of the present utility model.

[embodiment]

The following example is to further explanation of the present utility model and supplements, the utility model is not constituted any limitation.

The anti-dry temperature-sensitive switch of electroheat equipment of the present utility model, applicable to multiple electrothermal device, as heat-generating disc, fever tablet etc., in the present embodiment, electrothermal device is heat-generating disc, it can be known electric heating film for heating dish.As shown in Figure 1 to 4, anti-dry temperature-sensitive switch of the present utility model comprises inner casing 80, shell 70, binding post, bimetal leaf 10, push rod 60 and metal clips 20, its groundwork principle is by bimetal leaf 10, to be heated to drive on push rod 60 to move, thereby promote metal clips 20, make moving contact 40 and fixed contact 50 separately cut off circuit, play the object of anti-dry.

Specifically, as shown in Figure 1, described shell 70 is the uncovered rectangular housing in lower end, and it is for the protection of each parts of its inside, and guarantees to use safety.Described inner casing 80 is hollow housing, and its top is provided with 3 connecting holes, is respectively used to install rivet 81 and push rod 60, and its bottom is provided with opening, for installing bimetal leaf 10, and bimetal leaf 10 is communicated with the external world.Described inner casing 80 is located in shell 70, and the height that it is highly less than shell 70 makes to form between inner casing 80 and shell 70 cavity.This cavity is used for installing metal clips 20 and binding post.Described binding post is provided with two altogether: power input binding post 31 and power output end binding post 32.In the present embodiment, described binding post is stepwise sheet metal, and its profile is similar to

its one end is individually fixed in the upside of inner casing 80, form the connecting portion parallel with the upper surface of shell 70, this connecting portion is vertically bending downwards, and stretch out and extend out to shell 70 from shell 70 bottoms along the direction parallel with connecting portion, stretch out part outside shell 70 for connecting external power cord.The connecting portion of described power input binding post 31 laminates on metal clips 20 ends, and its lap is fixed on the upper end of inner casing 80 by rivet 81, can certainly fix and inner casing 80 upper ends by welding manner.The connecting portion of described power output end binding post 32 is under metal clips 20, and it is directly fixed on inner casing 80 by rivet 81.In the end of described power output end binding post 32, be provided with fixed contact 50.In the present embodiment, described fixed contact 50 is riveting on power output end binding post 32, can guarantee the stability connecting.In other embodiment, fixed contact 50 also can be fixedly welded on power output end binding post 32.One end of described metal clips 20 and inner casing 80 are affixed, and its other end is free end, at the free-ended end of metal clips 20 downside,, on the position corresponding with fixed contact 50 positions, are provided with moving contact 40.The reliability connecting for improving structure, described moving contact 40 is riveting on metal clips 20.Described moving contact 40 is conduction tie point with fixed contact 50, and during normality, both contact connection, thereby can turning circuit.In the inside of described inner casing 80, be provided with bimetal leaf 10 and push rod 60, described bimetal leaf 10 is located at the bottom of inner casing 80 inside, and parallels with described metal clips 20.Because inner casing 80 bottoms are provided with opening, therefore the lower surface of described bimetal leaf 10 directly protrudes from outside inner casing 80, during installation, can directly contact with electrothermal device, thereby improve temperature control.In addition, between bimetal leaf 10 and inner casing 80 bottoms (opening), also metal conducting strip 90 can be set, as Figure 1 and Figure 4, on metal conducting strip 90, be provided with through hole 91, described metal conducting strip 90 is fixed in inner casing 80 bottoms, thereby can evenly conduct heat by metal conducting strip 90, and metal conducting strip 90 is provided with through hole 91, also can make the ledge of bimetal leaf 10 directly contact with electroheat equipment, to improve induction sensitivity.Described push rod 60 is vertically located between bimetal leaf 10 and metal clips 20, its one end is fixed in the middle part of bimetal leaf 10, its other end is through the connecting hole at inner casing 80 tops, and be resisted against the downside at metal clips 20 middle parts, make when bimetal leaf 10 temperature reach rated temperature, bimetal leaf 10 is bent upwards and promotes push rod and moves up, thereby jack-up metal clips 20 makes moving contact 40 separated rapidly with fixed contact 50, cut off circuit, prevent dry combustion method.

Described inner casing 80 is made by electrical insulator material, during use, the anti-dry temperature-sensitive switch of electroheat equipment of the present utility model is installed in to electrothermal device, as Electric radiant Heating Film one side of heat-generating disc, bimetal leaf 10 is directly contacted with electrothermal device, then binding post is connected with both ends of power respectively, make the anti-dry temperature-sensitive switch string place in circuit of electroheat equipment of the present utility model, as shown in Figure 2, electric current flows to metal clips 20 by power input binding post 31, then by the moving contact 40 being in contact with one another, be electrically connected to power output end binding post 32 with fixed contact 50, form path.When electrothermal device excess Temperature, when occurring dry combustion method and reaching bimetallic rated temperature, as shown in Figure 3, described bimetal leaf 10 is bent upwards, and promotes to move on metal clips 20, and make moving contact 40 separated rapidly with fixed contact 50 by push rod 60, cut off rapidly circuit, prevent dry combustion method.Because bimetal leaf 10 directly contacts with electrothermal device, its temperature sense is sensitiveer, and reaction action is rapider, more can improve anti-dry protective effect, and because reaction is swift in motion, more can avoid arcing under high electric current to produce, and improves security performance.

Although the utility model is disclosed by above embodiment; but protection range of the present utility model is not limited to this; do not departing under the condition of the utility model design, the distortion that above each member is done, replacement etc. all will fall within the scope of claim of the present utility model.

Claims (9)

1. An anti-dry temperature sensitive switch for electric heating equipment, characterized in that the temperature sensitive switch includes: A bimetal sheet (10) that can deform with temperature changes, which is in contact with the electric heating device; A metal shrapnel (20), one end of which is connected to the power input terminal (31), and the other end is a free end, and the free end is provided with a moving contact (40); The static contact (50), which is set at the position corresponding to the movable contact (40) on the connection terminal (32) of the power output end, and the static contact (50) is in contact with the movable contact ( 40) contact and conduction; A push rod (60), one end of which is connected to the bimetallic sheet (10), and the other end bears on the metal shrapnel (20); and When the electric heating element of the electric heating equipment reaches the set temperature, the bimetallic sheet (10) is deformed by heat and bends upwards, pushing the push rod (60) to move upwards, so that the movable contact (40) at the end of the metal shrapnel (20) Disconnect the static contact (50) and cut off the circuit to prevent the electric heating device from burning dry. the 2. The anti-dry temperature sensitive switch of electric heating equipment according to claim 1, characterized in that, the push rod (60) is vertically arranged between the bimetal (10) and the metal shrapnel (20), which One end is fixedly connected to the middle part of the bimetallic sheet (10), and the other end thereof bears against the middle part of the metal shrapnel (20). the 3. The anti-dry temperature sensitive switch of electric heating equipment according to claim 2, characterized in that, the temperature sensitive switch is provided with an outer shell (70) with an open lower end and a hollow inner shell (80), the outer shell ( 70) Sleeved outside the inner shell (80), a cavity is formed between the two, the metal shrapnel (20) is set in the cavity, and the power input terminal (31) is fixedly connected to the inner shell ( 80), one end of the metal shrapnel (20) is connected to the power input terminal (31), and the power output terminal (32) is fixedly connected to the position corresponding to the metal shrapnel (20) on the inner shell (80). The bimetal sheet (10) is arranged at the inner bottom of the inner casing (80), one end of the push rod (60) is fixedly connected to the bimetal sheet (10), and the other end of the push rod (60) passes through the inner casing (80) against the The above metal shrapnel (20). the 4. The anti-dry temperature sensitive switch of electric heating equipment according to claim 3, characterized in that, the bottom of the inner shell (80) is provided with an opening, and the bimetallic strip (10) communicates with the electric heating device through the opening. touch. the 5. The anti-dry heating temperature sensitive switch of electric heating equipment according to claim 4, characterized in that, a metal heat conducting sheet (90) is provided at the position corresponding to the bimetal sheet (10) at the bottom of the inner shell (80), The metal heat conduction sheet (90) is provided with a through hole (91), and the bimetal sheet (10) is fixed on one side of the metal heat conduction sheet (90), and is in contact with the electric heating device through the through hole (91) . the 6. The anti-dry temperature sensitive switch of electric heating equipment according to claim 3, characterized in that, the connecting end of the metal shrapnel (20) and the power input terminal (31) is fixedly connected by a rivet (81) or Welded on the inner shell (80), the movable contact (40) is riveted or welded to the free end of the metal shrapnel (20), and the static contact (50) is riveted or welded to the power output terminal wiring On the terminal (32), the power output terminal (32) is affixed or welded to the inner shell (80) through a rivet (81). the 7. The anti-dry heating temperature sensitive switch of electric heating equipment according to claim 6, characterized in that one end of the power input terminal (31) and the power output terminal (32) are respectively connected to the inner shell (80 ) are fixedly connected, and the other ends respectively protrude from the bottom opening of the shell (70) and extend to the outside of the shell (70) in the opposite direction. the 8. The anti-dry heating temperature-sensitive switch of electric heating equipment according to claim 7, characterized in that, the power input terminal (31) and the power output terminal (32) are stepped metal sheets. the 9. The anti-dry heating temperature-sensitive switch of an electric heating device according to any one of claims 3-8, characterized in that, the inner shell (80) is made of insulating material. the

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