JPS61143022A - Electric pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric kettle for heating water, and in particular to an electric kettle for heating water, and in particular for an electric kettle that cuts off the power supply to the heating device after the water has been reliably boiled.
This relates to an electric pot with one function.

BACKGROUND OF THE INVENTION It is generally well known that boiling is preferable when brewing coffee, tea, black tea, etc. BACKGROUND ART Conventionally, water heaters that cut off power supply to a heating element after boiling water have been known to detect water temperature or to detect steam that is rapidly generated during boiling.

Problems to be Solved by the Invention In these conventional configurations, the boiling point of water is 100°C (under 1 atmosphere), which requires an extremely accurate detection device, and mass production is difficult. It was not suitable for In addition, in the case of a type that detects steam that is rapidly generated during boiling, in order to prevent malfunctions due to steam that is generated before boiling, a steam passage is led out from the container containing water to the outside of the main body, and a A vapor detection element was installed in the
It is expensive because it has a complicated steam passage, and the temperature of the steam detection element does not drop for a long time even after the power supply is cut off after boiling, so if you want to reboil it, it will take quite a long time. I had to wait.

The present invention solves these problems by using a shape memory alloy for the vapor detection element, has an extremely simple structure, and cuts off the power supply to the heating device after the water is completely boiled, allowing the water to be boiled in a short time. The purpose of the present invention is to provide an electric kettle with a boiling and sub-ra function that enables re-boiling.

Means for Solving the Problem In order to solve this problem, the present invention stores a switch element and a mechanism member in a main body that houses an inner container made of gold IIA equipped with a heating element at the bottom, and A lid for opening and closing the opening of the inner container is provided in the lid, a steam passage communicating with the inner container is formed in the lid, a steam detection member made of a shape memory alloy is provided in the steam passage, and a vapor detection member made of a shape memory alloy is provided in the lower part of the lid. A transmission member is provided for transmitting the operation of the vapor detection member to the switch element through the mechanical member, and the operation of the vapor detection member operates the switch element to control energization to the heating element.

Function: With this configuration, the steam detection element is kept at a low temperature until the water in the inner container boils, and the steam that is rapidly generated due to boiling is applied to the steam detection element through the steam passage to detect boiling, and the steam is transmitted through the transmission member. The mechanical parts are linked to control the energization of the heating element. Furthermore, since the steam detection member is provided on the lid, when steam generation is interrupted, the temperature of the steam detection element immediately decreases, making it possible to perform reboiling operation in a short time.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a cylindrical container outer body, with a spout 2 fixed to its upper opening and a bottom plate 3 integrally attached to its lower end. Reference numeral 4 denotes an upper lid which is attached to the spout 2 so as to be openable and closable, and this upper lid 4 is fixed so as to be openable and closable using the back portion 4a as a fulcrum and lock knobs 5 provided on both sides of the front beak portion 4b. In addition, the upper lid 4 has a cylindrical portion 4C with an open top in the center.
A push plate 6 that is vertically slidable is provided inside the cylindrical portion 4C. A lock ring 7 restricts the vertical sliding of the push plate 6, and is engaged with a switching lever 8, so that the vertical movement of the push plate 6 can be selected. Reference numeral 9 denotes a bellows pump provided at the lower part of the push plate 6, which is sealed by attaching the upper surface to the upper plate 10 and the lower surface to the lid cover 11 by ultrasonic welding or the like.

Further, the upper plate 10 has a vent hole 10a in the center, and when the push plate 6 moves downward, a push lip 12a provided at the center of the steam cover 12 which is integrally engaged with the push plate 6 is opened. A movable valve 13 is provided at the lower end to close the vent 10a and to open the vent 10a when the push plate 6 moves upward. A coil spring 14 for returning the movable valve 13 is interposed between the movable valve 13 and the lower part 10b of the upper plate 10. In addition, the lower part 10b of the upper plate 1G and the upper surface part 1 of the lid cover 11
1a is a coil spring 1 for returning the hero's pump 9.
5 is interposed. Reference numeral 11b denotes a spout provided approximately in the center of the upper surface portion 11a of the lid cover 11, and communicates with the spout 17a of the lid body 17 made of resin through the lid backing 16. Reference numeral 18 denotes a communication backing that allows airtight communication between the vent 10a provided in the upper plate 10 and the steam cover 12.

Further, the upper frontage portion 12b of the steam cover 12 faces the steam hole 6a provided in the push plate 6. One is a heat conductive plate with good thermal conductivity whose central portion protrudes upward, and its outer peripheral portion is liquid-tightly fixed to the lower part of the stainless steel inner body by base metal welding or the like to form a container 19a. This container 19a has a flange portion 19t at its upper end, and is supported by the spout 2 via a container backing 20. The lid 11 placed on the upper end of the container 19a has a discharge port 1 in the center for discharging steam.
7a, and a valve chamber 22 incorporating an overflow prevention valve 21. A shielding plate 23 made of a stainless steel plate or the like is fixed to the lower surface of the lid 17 with screws or the like, and a compartment A is formed by the lid 17 and the shielding plate 23. The shielding plate 23 is provided with a small ventilation hole 23a. 24 is a waterproof backing that covers the container 19a and the lid 17.
is kept confidential. 25 is from the valve chamber 22 to the container 19
It is a water rising pipe extending from the bottom of the container 19a, and its upper end is equipped with a spout 26a extending outward from the container 19a and having its tip opened downward, and a spouting via 26 and a valve cover 2.
7 in the valve chamber 22. Reference numeral 28 denotes a display plate fixed to the outer shell 1 of the container, and the spout 26 is located inside.
A water conduit 29 is provided to guide the field exiting from a to the outside of the vessel. A heat generating plate 30 wrapped with heating wires is inserted into the heat transfer plate 19 from below with insulating plates stacked on top and bottom. Each of these members has a through hole in the center, and the whole is made up of a metal heat diffusion plate 31 with good thermal conductivity and having a through hole in the center.
and is crimped with a backing material 32 to form a heating element 19c. A heat shield plate 33 is provided below the heating element 19c, and a temperature controller 34 is pressed and installed under the center of the heat transfer plate 19 by a mounting spring 35. 3B is the lid cover 11
It is a substantially elbow-shaped steam ejecting cylinder fixed to the substantially central part by ultrasonic welding or the like, and the end thereof faces a steam detection spring 37 made of a shape memory alloy, which will be described later. A small hole 36a is also provided in the upper part of this ejection cylinder 36, and communicates with the discharge ports 17a and 17b of the lid body 11 through the lid backing 16.

The steam passage is connected from the inside of the container 19a to the small ventilation hole 23a1, the outlet 17a, the lid backing 16, the steam jet discharge cylinder 36, the inside of the pump, the vent 10a, and the upper opening 12.
It is formed by b1 steam hole 6a.

3 and 7, a square-shaped mounting bracket 38 is installed on the top of the lid cover 11 inside the bellows pump 9 at an appropriate position facing the jet discharge 9i3G, and a steam detection spring 37 made of a shape memory alloy is installed on the lid cover 11. A vertically movable sliding rod 39 installed at the lower part of the cover 11 is locked between the upper part and the mounting bracket 38. The vapor detection spring 37 is formed into a coil spring shape using a Ti-Ni alloy that is shortened to its original state at a constant temperature of 100° C. or less, or an alloy such as Cu-Zn. There is. Sliding rod 39 and lid cover 11
Watertight backing 41 with built-in bias spring 4G between
is set. ! A seven flange portion 39a is provided at the lower end of the I-moving rod 39, and is engaged with one end of a transmission lever 42 constituting a transmission member. Transmission lever 4
2 is rotatably attached at the center by a fulcrum shaft 44 to a support base 43 attached to the lid cover 11, and a push rod 45 is fixed downwardly to the other end.

As a result, the entire transmission member that transmits the amount of expansion and contraction of the steam detection spring 37 is configured. A through hole 11C is provided in the lid cover 11 facing the tip of the push rod 45, so that the push rod 45 can be inserted therein. Furthermore, the transmission member portion located at the lower part of the lid cover 11 is hermetically covered with a protective cover 46.

A through hole is provided on the front upper surface of the spout 2 facing the push rod 45, and a push member 48 is provided in a liquid-tight manner so as to be vertically slidable with a bellows backing 47 interposed therebetween.

The spout 2 located below and facing the pushing member 48 is provided with a hook mechanism when the container is in use.

As shown in FIGS. 5 and 6, the upper and lower sides of the mechanism frame 49 are bent at right angles, and the mounting member 51 is mounted within the mechanism frame 49 with a sliding shaft 50 interposed therebetween. It is attached so that it can be slid up and down, and is constantly pulled upward by a coil spring 51c. The side portion of the mounting member 51 is bent, and the operation plate 52 is attached so as to be rotatable in the counterclockwise direction together with the hook plate 53, and the operation plate 52 extends to the front and outside of the vessel. Note that the hook plate 53 has a claw portion 53a at an intermediate portion in the vertical direction.
is provided, and a hook spring 51b is provided between the hook portion Sla of the attachment member 51 and biases the hook plate 53 to always rotate clockwise. Further, a claw portion 52a provided at the lower end of the operation plate 52 substantially contacts the hook plate 53, so that when the operation plate 52 is rotated counterclockwise, the hook plate 53 is rotated in the same direction. . Furthermore, hook plate 5
The lower end of 3 is bent and provided with a locking portion 53b.

The other side of the mechanism frame 49 is bent, and an interlocking plate 55 is attached to the upper part of the bent part 49a so as to rotate clockwise around a rotation shaft 54. The upper and lower sides of the interlocking plate 55 are bent at right angles to form an interlocking tongue portion 55a and an interlocking locking portion 55b, and the interlocking locking portion 55b engages with the locking portion 53b of the hook plate 53. A claw portion 5 is provided on the side of the interlocking plate 55.
5c is provided, and an interlocking spring 56 is provided between the interlocking plate 55 and the claw portion 49b provided on the bent portion 49a of the mechanism frame 49, and exerts a biasing force to constantly rotate the interlocking plate 55 in the counterclockwise direction. It is something. The end of the interlocking tongue 55a is located directly below and opposite to the push member 48 set on the lever 02, and the operating knob 51 is attached to the end of the operating plate 52. Further, a switch element 58 is provided below the locking portion 53b of the hook plate 53 to face it.

A predetermined electric circuit wiring is formed from this switch element 58,
This is what makes up the entire electric kettle.

In the above configuration, when water is stored in the container 19a and the operating knob 57 is pushed downward, the mounting member 51 moves onto the sliding shaft 50.
At the same time, the hook plate 53 attached inside the body also lowers, and the locking part 55b of the interlocking plate 55 rotates clockwise by the locking part 53b, and by the action of the interlocking spring 56. The locking portion 53b and the locking portion 55b engage with each other.

At the same time, the locking portion 53b presses the switch element 58 at its lower part, turning on the electric circuit to the heating element 19c. When electricity starts, the heating element 19C is heated, and heat is transferred to the liquid through the heat transfer plate 19.

At the same time as this heat transfer, heat is diffused toward the outer circumference of the lower part of the container 19a through the heat diffusion plate 31 and the backing material 32, which have good heat transfer characteristics. When the liquid starts to boil due to heating, the boiling water passes through the small ventilation hole 23a of the shielding plate 23 from inside the container 19a, and is discharged to the steam jet discharge tube 3 through the discharge port 17a of the lid body 17.
Enter 6. Furthermore, a part of the steam passes through the small hole 36a and is discharged to the outside along the aforementioned route from the inside of the pump to the ventilation hole 11a to the upper opening portion 12b to the steam hole 6a. At the same time, a portion of the steam that has entered the steam jet discharge pipe 36 is jetted out from the elbow-shaped end and hits the steam detection spring 37 . As a result, the steam detection spring 37 instantly restores its memory due to the high temperature steam and shortens upward. At the same time as it is shortened, the slide rod 39 is pulled upward and the transmission lever 42 engaged therewith is rotated. Fulcrum shaft 4
The push rod 45 at the other end of the transmission lever 42, which is rotated about 4 as a fulcrum, moves downward and pushes down the push member 4B installed on the upper surface in front of the spout 2. At the same time, the pushing member 48 pushes the interlocking tongue portion 55a of the IO plate 55, which is a mechanical member, and rotates the interlocking plate 55 clockwise about the rotation shaft 54. As a result, the engaging portions of the locking portion 55b and the locking portion 53b are separated. At the same time as the attachment member 51 is separated, the coil spring 51c moves the hook plate 53 and the operation plate 5 upward.
Lifts up with 2.

As a result, the locking portion 53b of the hook plate 53 separates from the pressing switch element 58, turns off the electric circuit, and cuts off power supply to the heating element 19c.

Since the container whose power supply is cut off has a double structure consisting of the container outer shell 1 and the container 19a, its heat retention is high, and the container shifts to the heat retention stage.

Immediately after the power supply is cut off, the ejection of steam is interrupted, and at the same time, the steam detection spring 37 starts cooling. In this case, the cooling rate is extremely short because the steam detecting spring 37 is actuated instantaneously upon contact with the steam, and the temperature within the entire pump does not rise much. In addition, when using the internal hot water after boiling, by pushing the push plate 6, the lagoon is taken out to the outside through the water raising vibrator 25 and the water conduit 29. In this case, since the cooling air outside the pump is sent into the inside of the pump, the cooling speed of the steam detection spring 37 is further promoted. The cooled vapor detection spring 37 is immediately returned to its initial state by the bias spring 40. At the same time, the transmission member and the mechanism member are returned to their initial states by the same operation □ as described above. When reusing, as described above, when the operating knob 57 is pushed downward, the locking portion 53b and the locking portion 55b are immediately engaged with each other, and at the same time, the switch element 58 is pressed to turn on the electric circuit. It is.

According to the present invention, if it is desired to cancel the energization for some reason, the operation plate 52 is slightly rotated and lifted up, and the hook plate 53 is rotated counterclockwise by the action of the claw portion 52a, and the hook plate 53 is engaged. The stop portions 53b and 55b are separated, and the pressure on the switch element 58 is released in the same manner as described above, thereby cutting off the power supply. Further, according to the present invention, whether or not power is being supplied from the outside can be easily determined based on the position of the operating knob 57.

Effects of the Invention As described above, according to the present invention, a vapor detection member made of a shape memory alloy is installed in the steam passage communicating with the inner container, and is configured to be linked with a switch element provided in the main body. The steam generated by the steam can be detected with high sensitivity and the switch element can be activated, allowing reliable boiling control. In addition, the lid, which can be opened and closed, does not have an electrical circuit structure, and only has a mechanical structure, and the heating element can be energized through the mechanism inside the main body. i! !
i? There is no risk of lH or the like, it is safe, and it has a simple structure and can be provided at low cost. Furthermore, since the vapor detection section is provided at a position far from the liquid in the inner container, the temperature of the detection section decreases quickly, and the interval for repeated boiling can be shortened, resulting in high usability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a longitudinal front view, Fig. 3 is an enlarged sectional view of main parts, Fig. 4 is a plan view, and Fig. 5 Figures and Figure 6 are perspective views of main parts;
FIG. 7 is an exploded perspective view of essential parts.

Claims (1)

[Claims] 1. A switch element and a mechanical member are housed in a main body that houses a metal inner container equipped with a heating element at the bottom, and a lid body for opening and closing the opening of the inner container is provided at the top of the main body, and the contents are stored in the lid body. A steam passage communicating with the vessel is formed, a steam detection member made of a shape memory alloy is provided in the steam passage, and a transmission member is provided at the bottom of the lid body for transmitting the operation of the steam detection member to the switch element through the mechanism member. An electric kettle in which the switching element is actuated by the operation of the vapor detection member to control the supply of electricity to the heating element.