WO2011147294A1 - Electric kettle - Google Patents

Abstract

An electric kettle, includes a kettle body (1), a negative temperature coefficient (NTC) thermistor, a heating device (5) and a printed circuit board (PCB) (6); the kettle body (1) is divided into an upper space and a lower space by the heating device (5); the electric kettle also includes an electromagnetic switch (3) and a driving mechanism (4) arranged in the lower space; one end of the driving mechanism (4) corresponds to an armature bracket (3021) in the electromagnetic switch (3) in space position; the other end of the driving mechanism (4) extends out of the sidewall of the kettle body (1); the turn-on and the turn-off of the two pairs of contact switches are controlled by the on-off of the electromagnetic switch (3).

Description

 electric kettle  electric kettle

Technical field

The invention relates to an electric kettle, in particular to an electric kettle capable of regulating the heating temperature of water.

Background technique

At present, the electric kettle has become a small household appliance widely used by ordinary households and units. Conventional electric kettles are generally provided with a temperature sensor with bimetal. The working principle is as follows: adding an appropriate amount of water to the electric kettle, and then placing the electric kettle on the power base; the user presses the power switch handle of the electric kettle, the electric kettle is powered on, the heating device starts to heat the water; the water is heated and burned At the time of boiling, the bimetal temperature sensor is deformed due to the rise to the boiling temperature, and then the switch spring is driven by the deformation of the bimetal, the switch is disconnected, the power of the electric kettle is cut off, and the power switch of the electric kettle is reset. The heating device is no longer heated.

The electric kettle control switch mainly adopts a bimetal as a temperature sensor, thereby controlling the temperature of the boiling and anti-drying functions of the electric kettle, and basically automating the boiling of the water. That is: when the water boils, the electric kettle can automatically disconnect the power supply and no longer heat the water; when the electric kettle does not cause dry burning, the temperature control switch can automatically cut off the power, no longer heating, to prevent the electric kettle from overheating. And it was damaged. However, this conventional electric kettle has the following disadvantages: it can only control a certain temperature point of the electric kettle, and can not control the temperature heated by water. That is: it can only be controlled when the water reaches a boiling temperature point or when the electric kettle does not have a high temperature protection temperature when the water is dry; when the user wants to heat the water to 85 ° C or 90 ° C or 95 ° C, this An electric kettle cannot be realized.

In the prior art, there is also an electric kettle capable of regulating the temperature, such as the Chinese utility model patent filed on May 30, 2008 and patent number: 200820048574.6. However, at present, electric kettles of this type need to be equipped with relays or thyristors, which leads to an increase in the cost of the electric kettle; since the power switches of the existing adjustable temperature electric kettles are in the form of buttons, thus Set the power switch handle, so it is very inconvenient for some customers who are used to the traditional pressing method.

Summary of the invention

According to the deficiencies of the electric kettle in the prior art, the main object of the present invention is to provide an electric kettle capable of regulating the temperature of water heating, low cost, and convenient operation.

In order to solve the above technical problem, the technical solution adopted by the present invention is: an electric kettle comprising a kettle body, an NTC thermistor, a heat generating device and a PCB board, the heat generating device separating the kettle body into two upper and lower spaces Providing an electromagnetic switch and a driving mechanism in the lower space; one end of the driving mechanism corresponds to an armature bracket in the electromagnetic switch in a spatial position, and the other end of the driving mechanism protrudes from a side of the kettle body The opening and closing of the electromagnetic switch also controls the turning on and off of the two pairs of contact switches.

In the present invention, two pairs of the contact switches simultaneously control the disconnection of the power source in the heat generating device and the PCB board. Since the contact switch simultaneously controls the disconnection of the power source in the heat generating device and the PCB board, the electric kettle is prevented from being in the EUP safety detection, and the power loss of the standby power of the PCB board is also reduced, and the power is also reduced. Safety requirements reduce the cost of electronic components. This is a significant improvement over the electrically adjustable thermoelectric kettles of the prior art.

In the present invention, the driving mechanism is disposed on the PCB board or is disposed on the side wall of the kettle body or is disposed at the bottom of the kettle body through a connecting seat.

In the present invention, the switching of the two pairs of the contact switches is controlled by an extension arm provided in the armature holder.

In the present invention, the two sides of the extension arm are respectively provided with shoulders, and the shoulders are respectively located on the upper surfaces of the first conductive terminals of the two contact switches.

In the present invention, the two sides of the extension arm are respectively provided with shoulders, and the shoulders are respectively between the first conductive terminal and the second conductive terminal of the two contact switches.

In the present invention, the turning on and off of the two pairs of the contact switches are controlled by a block provided in the armature holder, and the block has a structure in which the upper end has a small lower end.

In the present invention, the block is an inverted trapezoidal block or an inverted triangular block.

The electromagnetic switch of the present invention is further provided with a reset device for facilitating separation of the contact switches from each other, and the reset device is an elastic member.

The electromagnetic switch of the present invention is further provided with a temperature sensor and a driving rod, and the temperature sensor is attached to the heat generating device, and two ends of the driving rod are respectively in contact with an edge of the temperature sensor and the armature bracket.

The bottom of the heat generating device of the present invention is further provided with a bimetal temperature sensor.

Compared with the prior art, the invention realizes the adjustment of the boiling water temperature under the low cost condition that the relay or the thyristor is not provided by providing the electromagnetic switch and the driving mechanism in the electric kettle. Compared with the prior art, the invention has the advantages of convenient operation, reliable operation and low cost.

DRAWINGS

1 is a schematic structural view of Embodiment 1 of the present invention;

Figure 2 is a front elevational view of the electromagnetic switch of the first embodiment;

2a is a schematic structural view of another extension arm in the first embodiment;

Figure 3 is a left side view of the electromagnetic switch of the first embodiment;

Figure 4 is a plan view of the electromagnetic switch of the first embodiment;

Figure 5 is a front elevational view of the electromagnetic switch in the second embodiment of the present invention;

Figure 6 is a left side view of the electromagnetic switch of the second embodiment;

Figure 7 is a plan view of the electromagnetic switch of the second embodiment;

Figure 8 is a front elevational view showing the electromagnetic switch in the third embodiment of the present invention;

Figure 9 is a left side view of the electromagnetic switch of the third embodiment;

Figure 10 is a plan view of the electromagnetic switch of the third embodiment;

The description of the structure of each part in the drawing:

1-body, 2-base, 3-electromagnetic switch, 301-base, 3011-bracket, 3012-positioning hole, 3013-through hole, 3015-cylindrical seat, 3021-armature bracket, 3022-armature, 3023-extension Arm, 3024-electromagnetic coil, 3025-shoulder, 3026-inverted trapezoidal block, 3027-crest, 304-switching shrapnel, 3041-first conductive terminal, 3042-second conductive terminal, 305-spring, 4-drive mechanism , 401-handle, 402-drive arm, 5-heating device, 6- PCB board, 7-temperature sensor, 701-driver, 702-connector.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

Specific embodiment 1

As shown in Fig. 1, Fig. 2, Fig. 3, and Fig. 4, it is the first embodiment of the present invention. As shown in FIG. 1, the embodiment mainly includes a kettle body 1 and a base 2. The kettle body 1 is provided with an NTC thermistor, a heat generating device 5, a switching device and a PCB board 6. The heat generating device 5 divides the kettle body 1 into two upper and lower spaces, and the NTC thermistor is disposed at The upper space detects the temperature of the water (the NTC thermistor may also be disposed at the bottom of the heat generating device to determine the temperature of the heated water. The setting of the NTC thermistor is in the electric kettle for measuring the water temperature electronically. In the prior art, the switching device and the PCB board 6 are disposed in a lower space, and the NTC thermistor generally adopts an NTC negative temperature coefficient thermistor. The switching device comprises an electromagnetic switch 3 and a driving mechanism 4, the electromagnetic switch 3 is fixedly disposed on the PCB board 6, and the driving mechanism 4 is movably disposed on a side wall of the kettle body 1 (or is disposed at an active position) The PCB board 6 is movably disposed at the bottom of the kettle body 1 through a connection base.) The PCB board 6 is substantially a control circuit. One end of the drive mechanism 4 corresponds in space to the armature bracket 3021 in the electromagnetic switch 3, and the other end of the drive mechanism 4 extends out of the side wall of the kettle body 1. The PCB board 6 is fixed on the heat generating device 5 by a bracket. The movable mechanism of the driving mechanism 4 is disposed on the side wall of the kettle body 1 to mean that the pivot point of the middle portion of the driving mechanism 4 is hinged with the kettle body 1. The driving mechanism 4 The driving arm 402 is in position and corresponding to the armature bracket 3021 in a movable contact (the movable contact means that the driving arm 402 and the armature bracket 3021 are separated from each other in a spatial position or the driving arm 402 and the armature bracket 3021 can slide parallel to each other along the guide rail in the horizontal direction.), the handle 401 of the driving mechanism 4 protrudes through the through hole on the side wall of the kettle body 1 and protrudes outside the kettle body 1 .

As shown in FIG. 2, the electromagnetic switch 3 includes a base 301, a bracket 3011, an armature bracket 3021, and an electromagnetic coil 3024. The electromagnetic coil 3024 and the bracket 3011 are fixedly disposed on the base 301. One end of the armature bracket 3021 is disposed at the top end of the bracket 3011 by a pin. The armature bracket 3021 is fixedly mounted with an armature 3022. When the electromagnetic coil 3024 is energized, a magnetic force is generated to attract the armature 3022. Regarding the working principle of the electromagnet switch 3, reference may also be made to the applicant's application on October 31, 2008. The Chinese invention patent application file of "Application No.: 200810217156.X".

As shown in FIG. 3 and FIG. 4, two pairs of horizontal contact switches are fixedly disposed on the base 301, and each pair of the contact switches includes a switch spring 304 and a second conductive terminal 3042, wherein the switch One end of the elastic piece 304 is provided with a first conductive terminal 3041 that cooperates with the second conductive terminal 3042. The switch spring piece 304 and the second conductive terminal 3042 may be disposed on the PCB board 6 in addition to the base 301. The first conductive terminal 3041 is connected to the power input end, the second conductive terminal 3042 is connected to the control circuit and the heating element (or the second conductive terminal 3042 is connected to the power input end, the first conductive terminal 3041 and The control circuit is connected to the heating element.). An extension arm 3023 is further integrally formed on the armature bracket 3021. The two sides of the extension arm 3023 are respectively provided with a shoulder 3025. In this embodiment, in a case where the contact switch is not subjected to an external force, the first conductive terminal 3041 and the second conductive terminal 3042 are in a tight contact state, and the shoulders 3025 are respectively located in the Between the first conductive terminal 3041 and the second conductive terminal 3042.

As shown in FIG. 2a, as another structural solution of the extension arm, the contact switch can also be designed to: the first conductive terminal 3041 and the said contact switch are not affected by an external force The second conductive terminals 3042 are in a separated state, and the shoulders 3025 are respectively located on the upper surfaces of the first conductive terminals 3041.

As shown in FIG. 3, the electromagnetic switch 3 is further provided with a reset device for facilitating separation of the contact switches from each other, and the reset device is a spring 305 (other elastic materials such as rubber and silicone may be used in actual manufacturing. , shrapnel, etc. can also play a reset role.). As shown in FIG. 2 and FIG. 3, a cylindrical seat 3015 is further integrally formed at a position of a symmetrical center line of the base 301. The cylindrical seat 3015 is drilled with a positioning hole 3012, and the spring 305 is disposed at the positioning. A hole 3012 is formed between the hole 3012 and the stud 3027 on the extension arm 3023.

In this embodiment, when the electromagnetic switch 3 is not working, the driving portion on the armature holder 3021 is driven by the spring 305, and the shoulder 3025 extending from the two sides of the extending arm 3023 will be The first conductive terminal 3041 is pulled up to separate the first conductive terminal 3041 from the second conductive terminal 3042. The switch elastic piece 304 is generally made of a flexible copper piece such as a constantan sheet or a beryllium bronze. The first conductive terminal 3041 and the second conductive terminal 3042 are responsible for turning on or off the power supply in the PCB board 6 and the heat generating device 5. In actual operation, when the armature bracket 3021 can cause the two contact switches to be separated from each other under the action of their own gravity, the spring 305 may not be provided (as shown in FIG. 1 because the electromagnetic switch 3 is It is fixed on the PCB board 6 in reverse.).

As a preferred embodiment of the present invention, it is also possible to maintain the anti-dry function of the conventional electric kettle by providing a bimetal temperature sensor under the heat generating device in consideration of the manufacturing cost, thereby making it possible to The NTC thermistor together achieves double protection of the electric kettle.

The working process and working principle of the embodiment are as follows: when the user needs to boil water, the user pours water into the kettle body 1 of the electric kettle, and places the kettle body 1 on the power base 2 to adjust the kettle body 1 On the boiling water temperature knob, set the temperature to which the water needs to be heated, such as 90 °C. Then, the external handle 401 in the driving mechanism 4 is pressed, and the driving mechanism 4 is circularly moved around the movable setting point. At this time, the driving arm 402 presses the armature holder 3021, and the pressed armature holder 3021 Rotating about the bracket 3011, the shoulder 3025 is also approaching the base 301. When the shoulder 3025 moves away from the first conductive terminal 3041, the first conductive terminal 3041 is in contact with the second conductive terminal 3042. After the first conductive terminal 3041 and the second conductive terminal 3042 are in contact with each other, the control circuit is powered on, and the control circuit energizes the electromagnetic coil 3024 to generate suction, and the fixed armature 3022 on the armature holder 3021 is sucked to make the first conductive terminal. 3041 and the second conductive terminal 3042 maintain a good conduction state. Since the first conductive terminal 3041 is in contact with and electrically connected to the second conductive terminal 3042, the heat generating device 5 is energized and heated to start heating the water in the kettle body 1. When the water in the kettle body 1 is heated to the water temperature set by the user, the control circuit sends a signal to de-energize the solenoid coil 3024, and the solenoid coil 3024 loses the suction force. Under the action of the return spring 305, the armature bracket 3021 rotates around the bracket 3011, and the armature 3022 leaves the electromagnetic coil 3024. The shoulder 3025 is away from the base 301 and pulls up the first conductive terminal 3041, and finally makes the first conductive The terminal 3041 is separated from the second conductive terminal 3042, and the heat generating device 5 and the control circuit are powered off. In this way, the electric kettle completes a process of boiling water. The control circuit here generally adopts an MCU microprocessor and peripheral power supply circuits, drive circuits and control switches. Of course, the control circuit can also be constructed by using ordinary electronic circuits and digital circuits. The circuit connection mode is generally: from the power supply ~ two pairs of contact switches ~ control circuit and the heat generating device 5, the switching of the switch is controlled by whether the electromagnetic coil 4 is energized or the handle 401. Of course, for safety requirements, the temperature protection switch will be added to the general circuit, such as: bimetal temperature sensor, then the connection method is: from the power supply ~ two pairs of contact switches ~ bimetal temperature sensor ~ control circuit and Heating device 5. Wherein, the switch of the bimetal temperature sensor can also be connected in front of (behind) the two pairs of the contact switches or connected behind the control circuit, in front of the heating device 5, as needed. The bimetal temperature sensor of the general bimetal temperature sensor is directly attached to the heat generating device 5, and directly senses the temperature of the heat generating device 5. Its main function is to detect the temperature change of the heat generating device 5. When the temperature of the heat generating device 5 exceeds the deformation temperature of the bimetal temperature sensor, the bimetal temperature sensor generates a kick and drives the switching mechanism of the bimetal temperature sensor to turn off the power, thereby effectively protecting the heat generating device 5 from being It will work over temperature, which will protect the electric kettle from damage due to excessive temperature.

Specific embodiment 2

Compared with the solution in the first embodiment, the main difference is that a new electromagnet switch is provided. Therefore, in this embodiment, the electromagnet switch will be further described in detail, and the installation mode of the electromagnet switch is set. Reference can be made to Figure 1 in the first embodiment.

As shown in FIG. 5, the electromagnetic switch 3 includes a base 301, a bracket 3011, an armature bracket 3021, and an electromagnetic coil 3024. The electromagnetic coil 3024 and the bracket 3011 are fixedly disposed on the base 301. One end of the armature bracket 3021 is disposed at the top end of the bracket 3011 by a pin. The armature bracket 3021 is fixedly mounted with an armature 3022. When the electromagnetic coil 3024 is energized, a magnetic force is generated to attract the armature 3022. Regarding the working principle of the electromagnet switch 3, reference may also be made to the applicant's application on October 31, 2008. The Chinese invention patent application file of "Application No.: 200810217156.X".

As shown in FIG. 6 and FIG. 7 , two pairs of vertical contact switches are fixedly disposed on the base 301 , and each pair of the switch switches includes two switch springs 304 , and each of the switch springs 304 One end is provided with a first conductive terminal 3041 and a second conductive terminal 3042 that cooperate with each other. The switch spring piece 304 may be disposed on the PCB board 6 in addition to the base 301. The first conductive terminal 3041 is connected to the power input end, the second conductive terminal 3042 is connected to the control circuit and the heating element (or the second conductive terminal 3042 is connected to the power input end, the first conductive terminal 3041 and The control circuit is connected to the heating element.). The armature bracket 3021 is also fixedly provided with a block having a large upper end and a lower end (which may also be integrally formed), and the block may be an inverted trapezoidal block 3026 or an inverted triangular block. In the embodiment, an inverted trapezoidal block 3026 is disposed, and the inverted trapezoidal block 3026 is disposed between the two pairs of contact switches, and the top ends of the two switch springs 304 contacting the inverted trapezoidal block 3026 are respectively provided with The chamfers of the inclined faces of the inverted trapezoidal block 3026 are described. In this embodiment, when the contact switch is not subjected to an external force, the first conductive terminal 3041 and the second conductive terminal 3042 are in a separated state.

As shown in FIG. 6, the electromagnetic switch 3 is further provided with a reset device for facilitating separation of the contact switches from each other, and the reset device is a spring 305 (other elastic materials such as rubber, silica gel, etc. may be used in actual use. Shrapnel, etc. can also play a reset role.). As shown in FIG. 6, a cylindrical seat 3015 is further integrally formed at a position of a symmetrical center line of the base 301. The cylindrical seat 3015 is drilled with a positioning hole 3012. The spring 305 is disposed at the positioning hole 3012 and Between the studs 3027 on the inverted trapezoidal block 3026.

In this embodiment, when the electromagnetic switch 3 is not working, the driving portion on the armature holder 3021 is separated from the first conductive terminal 3041 by the elastic force of the spring 305. A conductive terminal 3041 and the second conductive terminal 3042 are in a separated and disconnected state. The switch elastic piece 304 is generally made of a flexible copper piece such as a constantan sheet or a beryllium bronze. The first conductive terminal 3041 and the second conductive terminal 3042 are responsible for turning on or off the power supply in the PCB board 6 and the heat generating device 5. In actual operation, when the armature bracket 3021 can cause the two contact switches to be separated from each other under the action of their own gravity, the spring 305 may not be disposed. (As shown in FIG. 1, since the electromagnetic switch 3 is fixed upside down on the PCB board 6.)

The working process and working principle of the embodiment are as follows: when the user needs to boil water, the user pours water into the kettle body 1 of the electric kettle, and places the kettle body 1 on the power base 2. Adjust the boiling water temperature knob on the kettle body 1 to set the temperature to which the water needs to be heated, such as 90 °C. Then, the external handle 401 in the drive mechanism 4 is pressed, and the drive mechanism 4 moves in a circular motion around the movable set point. At the same time, the driving arm 402 presses the armature holder 3021, and the pressed armature holder 3021 rotates around the bracket 3011, and the inverted trapezoidal block 3026 also approaches the base 301. When the inverted trapezoidal block 3026 presses the first conductive terminal 3041 and deforms it into contact with the second conductive terminal 3042, the armature 3022 fixed on the armature holder 3021 also gradually approaches the electromagnetic coil 3024. When the first conductive terminal 3041 and the second conductive terminal 3042 are turned on, the control circuit is powered on, and the control circuit energizes the electromagnetic coil 3024 to generate suction, and the fixed armature 3022 on the armature holder 3021 is sucked, so that the inverted trapezoid block 3026 is caused. The first conductive terminal 3041 is always pressed to keep the first conductive terminal 3041 and the second conductive terminal 3042 in contact with each other. Here, the first conductive terminal 3041 and the second conductive terminal 3042 are both elastic conductive materials, and as long as the external force overcomes the elasticity, the deformation is caused by the force. At this time, since the first conductive terminal 3041 is in contact with the second conductive terminal 3042, the heat generating device 5 is energized and heated to start heating the water in the kettle body 1. When the water in the kettle body 1 is heated to the water temperature set by the user, the control circuit sends a signal to de-energize the solenoid coil 3024, and the solenoid coil 3024 loses the suction force. The armature bracket 3021 is subjected to a reset mechanism, that is, a spring 305. The armature bracket 3021 rotates around the bracket 3011, the armature 3022 leaves the electromagnetic coil 3024, and the inverted trapezoidal block 3026 is away from the base 301. Finally, the inverted trapezoidal block 3026 leaves the first conductive terminal 3041, and the first conductive terminal 3041 automatically returns to its original state due to its elasticity. Thus, the first conductive terminal 3041 and the second conductive terminal 3042 are also separated and disconnected, the heat generating device 5 and the control circuit are powered off, the heat generating device 5 is no longer heated, and the control circuit is no longer working. In this way, the electric kettle completes a process of boiling water. The control circuit here also adopts an MCU microprocessor and peripheral power supply circuits, drive circuits and control switches. The circuit connection method is the same as that of the embodiment (1).

Concrete embodiment 3

Compared with the solution in the second embodiment, the main difference is that the electromagnet switch 3 is further provided with a mechanism for separating the first conductive terminal 3041 and the second conductive terminal 3042 from each other during dry burning. This mechanism will be described in further detail in this embodiment.

As shown in Figures 8, 9, and 10, the mechanism includes a temperature sensor 7 and a drive rod 701 coupled thereto. In this embodiment, the temperature sensor 7 is a bimetal temperature sensor, and the temperature sensor 7 is fixedly disposed on the base 301. The base 301 is provided with a through hole 3013 concentric with the positioning hole 3012, and one end of the driving rod 701 is in contact with the edge of the temperature sensor 7. The other end of the driving rod 701 is in contact with the stud 3027 on the inverted trapezoidal block 3026 through the through hole 3013 (the positioning hole 3012 may be additionally disposed such that the other end of the driving rod 701 is The inverted trapezoidal block 3026 on the armature holder 3021 is in contact with or directly in contact with the armature holder 3021. The front surface of the temperature sensor 7 is in close contact with the heat generating device 5, and the temperature sensor 7 is connected to the base 301 via a connecting piece 702. The temperature sensor 7 can also be directly fixed on the heating device 5 or through the connecting piece. 702 is fixed on the PCB board 6.

When the control circuit is damaged or is in error, the heating device 5 may be heated until the water in the kettle body 1 is dried. If the water in the kettle body 1 is dried, the heat generating device 5 is still When heated, the temperature of the heat generating device 5 in the body 1 will rise sharply. When the temperature of the heat generating device 5 exceeds the temperature at which the temperature sensor 7 is deformed, the bimetal temperature sensor 7 in the body 1 and the heat generating device 5 is closely attached. The kicking deformation is generated, and the edge thereof is turned up, and the edge pushes the driving rod 701 to the driving portion of the armature holder 3021, and the armature holder 3021 is pushed up to push the armature 3022 fixed on the armature holder 3021 away from the electromagnetic coil 3024. The driving portion on the armature holder 3021 in this embodiment is an inverted trapezoidal block 3026 that is up and down, and is pushed up by the driving rod 701 to no longer press the first conductive terminal 3041, so that the first conductive terminal 3041 and the second conductive terminal 3041 The conductive terminal 3042 is separated and disconnected, so that both the control circuit and the heat generating device 5 are powered off, and the heat generating device 5 is no longer heated, thereby providing an over-temperature protection function.

When the mechanism in the embodiment is disposed in the first embodiment, the driving rod 701 also causes the shoulder 3025 to pass the first conductive terminal 3041 during the process of jacking up the extension arm 3023 and the armature holder 3021. Pulling up, the first conductive terminal 3041 and the second conductive terminal 3042 are separated and disconnected, so that both the control circuit and the heat generating device 5 are powered off, and the heat generating device 5 is no longer heated, which also functions as an over temperature protection.

In the present embodiment, the temperature sensor 7 is fixed on the base 301 through the connecting piece 702. The driving rod 701 is directly pushed by the edge of the bimetal temperature sensor 7, and there are many solutions for pushing the driving rod 701 in actual design. The lever mechanism is driven by the deformation of the bimetal temperature sensor 7, and the driving rod 701 is pushed up to open the armature bracket 3021 to achieve the purpose of separating and disconnecting the first conductive terminal 3041 and the second conductive terminal 3042. The number of the temperature sensor 7 and the driving rod 701 may be set correspondingly according to actual conditions.

Claims (11)

1. An electric kettle comprising a kettle body (1), an NTC thermistor, a heat generating device (5) and a PCB board (6), the heat generating device (5) separating the kettle body (1) into two upper and lower spaces , characterized in that it further comprises an electromagnetic switch (3) and a driving mechanism (4) disposed in the lower space; one end of the driving mechanism (4) is in a spatial position and an armature in the electromagnetic switch (3) Corresponding to the bracket (3021), the other end of the driving mechanism (4) protrudes from the side wall of the kettle body (1); the opening and closing of the electromagnetic switch (3) also controls the connection of the two pairs of contact switches Pass and disconnect.
2. The electric kettle according to claim 1, characterized in that two pairs of said contact switches simultaneously control the disconnection of the power source in said heat generating means (5) and said PCB board (6).
3. The electric kettle according to claim 1, characterized in that the drive mechanism (4) is movably disposed on the PCB board (6) or is movably disposed on a side wall of the kettle body (1) or connected The seat activity is set at the bottom of the kettle body (1).
4. The electric kettle according to claim 1, wherein the opening and closing of the two pairs of said contact switches are controlled by an extension arm (3023) provided in said armature holder (3021).
5. The electric kettle according to claim 4, wherein the two sides of the extension arm (3023) are respectively provided with shoulders (3025), and the shoulders (3025) are respectively in the first contact of the two contact switches. The upper surface of the terminal (3041).
6. The electric kettle according to claim 4, wherein the two sides of the extension arm (3023) are respectively provided with shoulders (3025), and the shoulders (3025) are respectively in the first contact of the two contact switches. Between the terminal (3041) and the second conductive terminal (3042).
7. The electric kettle according to claim 1, wherein the opening and closing of the two pairs of said contact switches are controlled by a block provided in said armature holder (3021), said block The object has a structure in which the upper end is small and the lower end is small.
8. The electric kettle according to claim 7, wherein the block is an inverted trapezoidal block (3026) or an inverted triangular block.
9. The electric kettle according to claim 8, characterized in that the electromagnetic switch (3) is further provided with a resetting means for facilitating separation of the contact switches from each other, the resetting means being an elastic member.
10. The electric kettle according to claim 9, characterized in that: the electromagnetic switch (3) is further provided with a temperature sensor (7) and a driving rod (701), and the temperature sensor (7) is attached to the heating device (5) Upper ends of the drive rod (701) are in contact with the edge of the temperature sensor (7) and the armature holder (3021), respectively.
11. The electric kettle according to claim 1, characterized in that the bottom of the heat generating device (5) is further provided with a bimetal temperature sensor.

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