Liquid heating container and electric kettle set

Abstract

The present invention provides a liquid heating container and electric kettle set that can be made more compact by reducing the size of the stopper. [Solution] The electric kettle 10 comprises a container body 20 and a stopper 30. The stopper 30 comprises a spout 42, a valve unit 50 for opening and closing a liquid passage R1, and an operating part 31a that is operated to move the valve unit 50 so that the liquid passage R1 is opened and closed. The valve unit 50 comprises a sealing valve 35 for opening and closing a steam passage R2, a valve housing part 54 for housing the sealing valve 35, and a hole forming part 53 having a through hole 53h that is closed by the sealing valve 35 when the electric kettle 10 is tipped over and opened when it is upright. The valve unit 50 comprises a shaft part 52 that extends in the vertical direction and moves up and down by operation of the operating part 31a. The hole forming part 53, the sealing valve 35, and the valve housing part 54 are located on the extension axis of the shaft part 52 and are positioned lower to the bottom of the container body 20 than the shaft part 52.

Description

Technical Field

[0001] The present invention relates to a liquid heating container and an electric kettle set.

Background Art

[0002] In the electric kettle described in Patent Document 1, a steam port for discharging steam inside the container body to the outside is provided on the handle side separately from the pouring spout, and a sealing valve is provided that moves to close a steam discharge passage connected to the steam port when the container body falls. This sealing valve is arranged on the handle side rather than at the position of the valve body that moves up and down to open and close the hot water flow passage connected to the pouring spout by the operation of the valve operating tool. Similarly, in the electric kettle described in Patent Document 2, a water stop ball valve that closes the steam passage when the electric kettle falls is arranged on the handle side of the plug body rather than at the position of the valve member that opens and closes the pouring spout by the operation of the operating portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configurations described in Patent Documents 1 and 2 above, since the valve that closes the steam passage when the container body falls is provided at a different position from the valve that opens and closes the hot water flow passage connected to the pouring spout, the plug body becomes large and it has been difficult to configure it compactly.

[0005] The present invention has been made in view of the above actual situation, and an object thereof is to provide a liquid heating container and an electric kettle set that can reduce the size of the plug body and be configured more compactly.

Means for Solving the Problems

[0006] (1) To achieve the above objective, a liquid heating container according to the first aspect of the present invention comprises a container body having a heating section for heating a liquid contained inside and an opening that opens upward, and a stopper configured to open and close the opening of the container body, wherein the stopper is located at the end of a liquid flow path passing through the stopper and is formed for pouring the liquid inside the container body to the outside, a valve unit for opening and closing the liquid flow path, and an operating section operated to move the valve unit so that the liquid flow path is opened and closed, wherein the valve unit opens and closes a vapor flow path passing through the stopper The container comprises a sealing valve, a valve housing for the sealing valve, a hole forming portion having a hole that is closed by the sealing valve to close the steam passage when the liquid heating container is inverted and opened to open the steam passage when the liquid heating container is upright, and a shaft portion that extends vertically when the stopper is attached to the opening of the container body and moves vertically when the operating portion is operated, wherein the hole forming portion, the sealing valve and the valve housing portion are positioned on the extension axis of the shaft portion and are located lower to the bottom of the container body than the shaft portion.

[0007] (2) In the liquid heating container described in (1) above, an internal space may be formed as part of the vapor flow path on the side of the sealing valve in the stopper body that is across from the hole forming portion, and the hole forming portion may be formed so that, regardless of whether the liquid flow path is opened or closed by the valve unit, the liquid accumulated in the internal space is returned to the container body through the hole when the liquid heating container is upright.

[0008] (3) In the liquid heating container described in (1) or (2) above, the steam flow path and the liquid flow path may each follow separate paths, and the end of each flow path may be formed to be on the same side in the circumferential direction with respect to the central axis of the shaft.

[0009] (4) In the liquid heating container described in any one of (1) to (3) above, an internal space is formed as part of the vapor flow path on the opposite side of the hole-forming portion from the sealing valve within the stopper body, the valve unit is fitted to the shaft portion and includes a shaft packing for preventing liquid from flowing out of the internal space to the outside when the container is tipped over, and a hole-outer side packing fitted to the outer circumference of the hole-forming portion and includes a hole-outer side packing for preventing the liquid in the internal space from returning to the container body from anywhere other than the hole, the stopper body includes a cylindrical portion surrounding the outer circumference of the internal space, the cylindrical portion has a gas inlet / outlet formed therein, which is located between the vertically aligned shaft packing and the hole-outer side packing and serves as the end of the vapor flow path that leads from the internal space to the outside, and an intake flow path is formed within the stopper body in a path that reverses direction from the vapor flow path for taking in air into the container body when pouring the liquid in the container body to the outside.

[0010] (5) In the liquid heating container described in any one of (1) to (4) above, the container body may have a shape in which the outer diameter of the container body decreases towards the upper side which is the opening side.

[0011] (6) To achieve the above objective, an electric kettle set according to a second aspect of the present invention comprises an electric kettle which is a liquid heating container as described in any one of (1) to (5) above, and a power supply plate on which the electric kettle can be placed and which supplies power for heating to the heating section when the electric kettle is placed on it. [Effects of the Invention]

[0012] According to the present invention, the stopper can be made smaller and more compact. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of an electric kettle according to one embodiment of the present invention, with the kettle removed from the power plate. [Figure 2]A cross-sectional view of an electric kettle according to an embodiment of the present invention when placed on a power plate. [Figure 3] (a) is a cross-sectional view of a plug portion of an electric kettle in which a valve unit according to an embodiment of the present invention is in a closed position, and (b) is a cross-sectional view of the plug portion of the electric kettle in which the valve unit according to the embodiment is in an open position. [Figure 4] A cross-sectional view of a plug portion of an electric kettle when it is overturned according to an embodiment of the present invention. [Figure 5] An exploded perspective view of a plug according to an embodiment of the present invention. [Figure 6] A perspective view of a plug body portion according to an embodiment of the present invention. [Figure 7] (a) and (b) are perspective views showing a mode of assembling a biasing member accommodating cylinder portion to a shaft portion according to an embodiment of the present invention. [Figure 8] A perspective view of a valve unit according to an embodiment of the present invention. [Figure 9] A bottom view of a valve unit according to an embodiment of the present invention. [Figure 10] A perspective view of a sealing valve according to an embodiment of the present invention. [Figure 11] A view of an electric kettle according to an embodiment of the present invention in a state of being laid on its side.

Mode for Carrying Out the Invention

[0014] A liquid heating container and an electric kettle set according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11. As shown in FIGS. 1 and 2, the electric kettle set 1 includes an electric kettle 10 that heats a liquid such as contained water to boil hot water and the like, and a power plate 60 that supplies electric power for heating to the electric kettle 10.

[0015] Unless otherwise specified, in the following description, the direction in which the central axis C of the electric kettle 10 extends is referred to as the vertical direction. Of this vertical direction, the direction from the bottom of the container body 20 of the electric kettle 10 toward the opening 20a is referred to as the upper side, and conversely, the direction from the opening 20a toward the bottom is referred to as the lower side. Also, the direction orthogonal to the central axis C is referred to as the radial direction. Of the radial direction, the direction approaching the central axis C is referred to as the inner radial direction or simply the inner side, and the direction away from the central axis C is referred to as the outer radial direction or simply the outer side. Further, the direction of orbiting around the central axis C is referred to as the circumferential direction. Also, of the radial direction, the direction passing through the handle 23, the central axis C, and the spout 42 is referred to as the front-back direction. Of the front-back direction, the direction from the handle 23 toward the spout 42 is referred to as the front side, and conversely, the direction from the spout 42 toward the handle 23 is referred to as the back side.

[0016] (Power supply plate 60) The power supply plate 60 includes a placement surface 61, a power supply unit 62, an operation panel 63, a control unit (not shown), a temperature detection unit (not shown), and the like. The placement surface 61 is formed as a substantially circular plane on the upper surface of the power supply plate 60, and the bottom surface of the electric kettle 10 is placed thereon. The power supply unit 62 is provided to protrude upward from the central portion of the placement surface 61, and supplies power to the heating unit 24 (see FIG. 2) of the electric kettle 10 placed on the placement surface 61 via a conduction part 25 (see FIG. 2) described later. The operation panel 63 is composed of a plurality of switches that are pressed by the user, a touch panel, or the like.

[0017] The control unit consists of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. When the electric kettle 10 is placed on the placement surface 61, the control unit receives an operation signal from the operation panel 63 and executes power supply to the heating unit 24 (heating of the liquid in the electric kettle 10). Then, when the control unit receives an operation signal from the operation panel 63 and when the liquid in the electric kettle 10 boils based on the detection result of the temperature detection unit (not shown), the control unit stops power supply to the heating unit 24.

[0018] (Electric kettle 10) As shown in Figures 1 to 3(a) and (b), the electric kettle 10 comprises a container body 20 and a stopper 30. The container body 20 has an opening 20a that opens upwards and is configured to hold liquids such as hot water inside. The container body 20 has a bottomed cylindrical shape with the opening 20a open, and the outer diameter of the container body 20 decreases towards the top. As shown in Figures 3(a) and 3(b), a spiral female threaded portion 20b is formed on the inner circumferential surface side near the opening 20a of the container body 20, into which the male threaded portion 30b of the stopper body 30 is screwed.

[0019] As shown in Figure 2, the container body 20 comprises an inner container 21, an outer container 22, a handle 23, a heating section 24, and a conductive section 25. The container body 20 has a two-layer structure in which the inner container 21 is housed inside the outer container 22, with the upper ends of each being fitted together. The inner container 21 is located inside the outer container 22 and is made of a metal such as stainless steel. The outer container 22 is formed to cover the outside of the inner container 21 and is made of a heat-resistant resin.

[0020] The handle 23 is provided on the outer surface of the container body 20 and is configured to be gripped by the user. The handle 23 is formed integrally with the outer container 22 and has a roughly L-shape when inverted in the vertical direction. The heating unit 24 is located on the bottom surface of the inner container 21 and receives power from the power plate 60 via the conductive part 25 to heat the liquid inside the container body 20, making it possible to boil liquids such as hot water inside the container body 20. The heating unit 24 consists of a heater. The conductive portion 25 is provided protruding downward from near the center of the bottom surface of the inner container 21, and by coming into contact with the power supply portion 62, it connects the power supply portion 62 and the heating portion 24.

[0021] (Plug body 30) As shown in Figures 1 to 3(a) and (b), the stopper 30 is configured to be detachably attached to the opening 20a of the container body 20. The stopper 30 is substantially disc-shaped, and a spiral male thread portion 30b is formed on the lower side of the outer circumferential surface of the stopper 30. When the stopper 30 is fitted into the opening 20a of the container body 20 and rotated in the closing direction, the male threaded portion 30b of the stopper 30 screws into the female threaded portion 20b of the container body 20, fixing the stopper 30 to close the opening 20a of the container body 20. Conversely, when the stopper 30 is rotated in the opposite direction (opening direction), the stopper 30 is removed from the opening 20a of the container body 20.

[0022] As shown in Figure 5, the plug body 30 comprises a plug body main body 40, an operating lever 31, a biasing member 32, a sealing valve 35, a biasing member housing cylinder 36, a packing 37, and a valve unit 50.

[0023] (Plug body part 40) In addition to the male threaded portion 30b described above, the plug body portion 40 includes, as shown in Figure 6, a peripheral wall portion 41, a spout 42, two operating support wall portions 44, a cylindrical portion 45, an inner bottom plate portion 46, and, as shown in Figure 5, a packing mounting portion 47.

[0024] The inner bottom plate portion 46 is plate-shaped perpendicular to the central axis C and forms an annular flat plate shape surrounding the central axis C. A liquid passage hole 45i, which is a through hole through which liquid passes, is formed in the inner bottom plate portion 46. The liquid passage hole 45i is formed in front of the central axis C and is positioned front to back with the spout 42 which is located further in front of it. The liquid passage hole 45i is located between the two operating support wall portions 44 and has a long, curved hole shape in the circumferential direction. The cylindrical portion 45 is cylindrical in shape and opens downwards. The lower end of the cylindrical portion 45 is connected to the inner circumference of the inner bottom plate portion 46. A through hole 45h is formed vertically through the central axis C of the cylindrical portion 45, through which the shaft portion 52, described later, passes. The cylindrical portion 45 includes a recess 45a where the lower end of the biasing member 32 is located, a packing housing cylindrical portion 45b that surrounds the outer circumference of the shaft packing 59 (see Figure 5) which is attached to the outer circumference of the shaft portion 52, and a gas inlet / outlet 45c formed to penetrate the side circumferential wall of the cylindrical portion 45 from front to back. The gas inlet / outlet 45c is located behind (inside) the spout 42 and the liquid passage hole 45i. The gas inlet / outlet 45c is located on the front side of the side circumferential wall of the cylindrical portion 45, slightly above the center in the vertical direction. The gas inlet / outlet 45c is formed as an elongated hole that is long in the circumferential direction. The circumferential length of the gas inlet / outlet 45c is shorter than the circumferential length of the liquid passage hole 45i. The gas inlet / outlet 45c is located directly above the liquid passage hole 45i, on the same side in the circumferential direction as the spout 42 and the liquid passage hole 45i, with respect to the central axis C. As shown in Figure 3(a), the liquid passage hole 45i is formed to spatially connect the spout 42 and the space Sq on the inclined surface located above the guide inclined surface 56, which will be described later. The recess 45a is located on the upper surface of the cylindrical portion 45 and is formed in an annular recess shape that is recessed downwards with respect to the central axis C. The packing housing cylinder portion 45b forms the inner circumferential wall of the recess 45a and is cylindrical with its lower end open, centered on the central axis C. The lower end of the packing housing cylinder portion 45b is connected to the inner circumferential portion of the bottom surface of the recess 45a. As shown in Figure 2, the packing housing cylinder 45b houses a shaft packing 59 to block the inflow of air from the shaft portion 52 side into the internal space Sp of the cylinder portion 45. The internal space Sp of the cylindrical portion 45 is a cylindrical space formed inside the cylindrical portion 45 and is configured as part of the steam flow path R2 (see Figure 3(a)).

[0025] As shown in Figure 6, the peripheral wall portion 41 is formed by erecting it on the upper side so as to surround the outer peripheral end of the upper surface of the inner bottom plate portion 46. The spout 42 is the part through which the hot water discharged from the liquid passage hole 45i passes. The spout 42 is formed by the front portion of the peripheral wall 41 bulging radially outward from the stopper body 30 like the lower beak of a bird. The spout 42 has a concave shape that opens upward, and the width of the spout 42 in the left-right direction (radially, in the direction perpendicular to the front-back direction) is formed to decrease towards the front. The height of the rear side of the peripheral wall portion 41 is lower than the height of the front side of the peripheral wall portion 41. This is to prevent interference between the operating lever 31 and the peripheral wall portion 41 when the operating portion 31a of the operating lever 31, which will be described later, is pressed down, thus preventing it from being pressed down.

[0026] The two operating support walls 44 are located on the upper front side of the inner bottom plate 46, between the cylindrical portion 45 and the spout 42. Each of the two operating support walls 44 is plate-shaped, extending in the front-rear direction toward the upper side of the inner bottom plate 46, and faces each other with the liquid passage hole 45i and gas inlet / outlet 45c in between. A hinge hole 44h is formed in each operating support wall 44, penetrating in its thickness direction (left-right direction).

[0027] A locking portion 41a is formed on the rear side of the inner circumferential surface of the peripheral wall portion 41. The locking portion 41a has a claw shape that protrudes toward the front and extends in the left-right direction. A locking portion 31d of the operating lever 31 (see Figures 2 and 5), which will be described later, is locked to the front lower surface of the locking portion 41a so as to restrict the upward movement of the operating lever 31.

[0028] As shown in Figures 2 to 5, the packing mounting portion 47 is located on the lower end side of the stopper body portion 40 and is provided in an annular shape with a central axis C and a convex shape extending radially outward. The packing 37 is installed by fitting the recess on the inner circumferential surface of the annular packing 37 into the packing mounting portion 47. When the stopper body 30 is installed in the opening 20a (container body 20), the packing 37 contacts the inner circumferential inclined surface on the opening 20a side of the container body 20 over its entire circumference, sealing the gap between the stopper body 30 and the container body 20. The packing 37 is made of an elastic material such as heat-resistant rubber such as silicone rubber or elastomer.

[0029] (Operating lever 31) The operating lever 31 comprises an operating section 31a, an operating body section 31b, two hinge plate sections 31c, a locking section 31d, and a pivot shaft section 31e.

[0030] The operating body 31b is formed in a roughly elliptical plate shape that is elongated in the front-to-back direction and is positioned to cover the upper surface of the plug body 30. The control unit 31a is located behind the control body 31b, extends to the rear, and is positioned above the handle 23. The control unit 31a is positioned at the rear, within reach of the thumb, so that it can be pressed down with the thumb when the electric kettle 10 is held with the handle 23 in hand.

[0031] The two hinge plate portions 31c are formed on the front side of the wall portion extending downward from the outer peripheral end of the operating body portion 31b, and are positioned opposite each other so as to sandwich the two operating support wall portions 44 from their respective left and right outer sides. A substantially cylindrical pivot shaft portion 31e is formed on the lower end of the inner surface of each hinge plate portion 31c that is facing each other and protruding inward. The pivot shaft portion 31e fits into the hinge hole 44h (see Figure 6) of each operating support wall portion 44, thereby supporting the operating lever 31 so that it can be rotated around the operating rotation axis J. The operating rotation axis J extends in the direction perpendicular to the central axis C, in which the two pivot shaft portions 31e or hinge holes 44h are aligned.

[0032] The locking portion 31d is located on the rear side of the lower surface of the operating body portion 31b and has a hook shape that extends downward. The portion of the locking portion 31d that protrudes rearward from the lower end engages with the aforementioned locked portion 41a, thereby restricting the upward movement of the operating portion 31a caused by the rotational operation of the operating lever 31.

[0033] As shown in Figures 7(a) and 7(b), the biasing member housing cylinder 36 comprises a cylindrical portion 36a extending vertically along the central axis C, and a ceiling portion 36b that closes the upper side of the cylindrical portion 36a. The ceiling portion 36b has a shaft passage hole 36h through which the upper part of the shaft portion 52 of the valve unit 50 (described later) passes. On the inner circumferential surface of the shaft passage hole 36h, two convex portions 36i are formed so as to face each other radially inward. The lower end of the biasing member housing cylinder portion 36 is located above the recess 45a of the cylinder portion 45.

[0034] The biasing member 32 is made of a metal coil spring and is located within the biasing member housing cylinder 36 such that the shaft portion 52, which will be described later, penetrates the inside of the spring. The biasing member 32 biases the valve unit 50 and the operating lever 31 upward via the biasing member housing cylinder 36.

[0035] (Valve unit 50) As shown in Figures 3(a), (b) and 4, the valve unit 50 has the function of opening and closing the liquid flow path R1 that extends to the spout 42 by operating the operating lever 31, the function of releasing the pressure inside the container body 20 and releasing steam to the outside via the steam flow path R2 when the electric kettle 10 is upright (not tipped over), and the function of closing the steam flow path R2 when the electric kettle 10 is tilted or tipped over.

[0036] As shown in Figures 8 and 9, the valve unit 50 comprises a shaft portion 52, a hole-forming portion 53, a valve housing portion 54, an umbrella-shaped portion 57, a connecting portion 58, a shaft packing 59, and a hole outer circumference packing 55. The hole-forming portion 53, the valve housing portion 54, the umbrella-shaped portion 57, and the packing 37 are located on the upper side of the internal space of the container body 20 when the stopper 30 is installed in the opening 20a of the container body 20, as shown in Figure 2.

[0037] The shaft portion 52 is roughly cylindrical in shape and extends along the central axis C. A mounting recess 52f is formed on the lower end side of the outer circumferential surface of the shaft portion 52, with the central axis C at its center. The shaft packing 59 comprises a sealing portion 59a and a mounting portion 59b. The mounting portion 59b is cylindrical in shape and extends vertically, and is mounted in the mounting recess 52f of the shaft portion 52. The sealing portion 59a protrudes radially outward in a flange-like manner along the entire circumference of the outer surface of the mounting portion 59b, and is always in contact with the inner surface of the packing housing cylinder portion 45b while elastically deforming along its entire circumference, regardless of whether the valve unit 50 is open or closed. In this state, the inflow of outside air into the internal space Sp of the cylinder portion 45 from the through hole 45h is blocked by the shaft packing 59. The shaft packing 59 is made of an elastic material such as a heat-resistant rubber such as silicone rubber or an elastomer.

[0038] Multiple retaining grooves 52d are formed on the upper side of the outer circumferential surface of the shaft portion 52, and multiple ventilation recesses 52e are formed on the lower side of the outer circumferential surface of the shaft portion 52. Multiple ventilation recesses 52e are positioned above the shaft packing 59. Each ventilation recess 52e extends along the central axis C and is recessed from the outside to the inside of the shaft portion 52. The ventilation recesses 52e are arranged at equal angular intervals in the circumferential direction of the shaft portion 52, and in this embodiment, three are provided at approximately 120-degree intervals in the circumferential direction.

[0039] As shown in Figures 7(a), (b) and 8, the retaining grooves 52d are provided at two locations approximately 180 degrees apart in the circumferential direction, and the two protrusions 36i of the biasing member housing cylinder 36 are locked into them. Each retaining groove 52d consists of a series of first to third grooves 52a to 52c, and each is provided so as to be recessed from the outside to the inside of the shaft portion 52. The first groove 52a extends downward from the upper end of the shaft portion 52 along the central axis C. The second groove 52b extends continuously from the lower end of the first groove 52a in the circumferential direction of the shaft portion 52. The third groove 52c extends continuously upward from the end of the second groove 52b opposite to the first groove 52a.

[0040] The assembly procedure for the biasing member housing cylinder 36 onto the shaft 52 will now be explained. As shown by arrow A1 in Figure 7(a), with the biasing member 32 placed on the recess 45a so that its lower end contacts the recess 45a on the upper surface of the cylindrical portion 45, the biasing member housing cylindrical portion 36 is moved from the upper side to the lower side of the shaft portion 52. Then, each protrusion 36i is inserted from the upper end into the first groove portion 52a of each retaining groove 52d, and each protrusion 36i reaches the lower end of the first groove portion 52a. At this time, the biasing member 32 is elastically deformed between the ceiling portion 36b and the recess 45a (cylindrical portion 45) and compressed in the vertical direction. When each protrusion 36i reaches the lower end of the first groove portion 52a, the biasing member housing cylindrical portion 36 is rotated circumferentially as shown by arrow A2, and the protrusion 36i is moved along the second groove portion 52b to the lower end of the third groove portion 52c. Then, when the external force applied to the biasing member housing cylinder 36 is released, the elasticity of the biasing member 32 causes each protrusion 36i to be biased upward and held in contact with the upper end of the third groove 52c. With this, the assembly of the biasing member housing cylinder 36 to the shaft 52 is completed. When the biasing member housing cylinder 36 is assembled to the shaft 52, when the operating lever 31 is not operated, the elastic force generated by the biasing member 32 biases the biasing member housing cylinder 36 upward, thereby biasing the shaft 52 and, consequently, the valve unit 50 upward via the biasing member housing cylinder 36. At this time, as shown in Figure 3(a), the lower end of the biasing member housing cylinder 36 is positioned away from the bottom surface of the recess 45a, the valve unit 50 is in contact with the packing 37 around its entire circumference, and the liquid flow path R1 is closed.

[0041] As shown in Figures 2 and 8, the hole-forming section 53 is roughly disc-shaped and perpendicular to the central axis C. The hole-forming section 53 has a through-hole 53h that penetrates vertically, allowing steam or liquid to pass through. The through-hole 53h is located on the central axis C and is circular when viewed from above or below. The bottom surface of the hole-forming section 53 surrounding the through-hole 53h is flat, while the top surface is inclined downward in a conical shape toward the through-hole 53h. This inclination of the top surface of the hole-forming section 53 is formed to receive water that has condensed and accumulated in the internal space Sp and return it to the container body 20 through the through-hole 53h. The hole-forming section 53 is located on the lower end side inside the cylindrical section 45 and is positioned to close the internal space Sp from below in the closed position (see Figure 3(a)). However, as shown in the steam flow path R2 in Figure 3(a), the hole-forming section 53 in the closed position does not seal the internal space Sp, but is able to communicate with the outside and allow ventilation. Furthermore, an annular mounting recess 53b is formed on the outer peripheral edge of the upper surface of the hole-forming portion 53 so that the inner peripheral side of the upper end of the hole-outer peripheral packing 55 fits into it. The hole-forming portion 53 is connected to the lower end of the shaft portion 52 via a connecting portion 58. The connecting portion 58 extends upward from the upper surface of the hole-forming portion 53 and is columnar in shape, connecting to the shaft portion 52 by sandwiching it from the radial direction. The connecting portion 58 supports the shaft portion 52 such that the lower end of the shaft portion 52 faces the through hole 53h of the hole-forming portion 53 with a gap above it. A peripheral wall portion 53a (see Figures 3(a) and 3(b)) is formed at the outer peripheral end of the lower surface of the hole-forming portion 53, extending downward. A convex portion is formed on the inner peripheral side of the peripheral wall portion 53a, projecting radially inward, and a recess is provided on the upper outer peripheral side of the umbrella-shaped portion 57 so as to fit with the convex portion provided on the inside of the peripheral wall portion 53a. After housing the sealing valve 35 in the valve housing portion 54, the convex portion of the peripheral wall portion 53a can be fitted into the recess of the umbrella-shaped portion 57, thereby holding the sealing valve 35 inside the valve housing portion 54.

[0042] The outer circumferential packing 55 of the hole comprises a sealing portion 55a and a mounting portion 55b. The mounting portion 55b is cylindrical in shape and covers the outer circumferential side of the hole forming portion 53 and the peripheral wall portion 53a. The mounting portion 55b has a U-shaped cross-section that opens radially inward. The upper inner circumferential portion of the mounting portion 55b is located within the mounting recess 53b of the hole forming portion 53, and the lower inner circumferential portion of the mounting portion 55b is located on the lower end surface of the hole forming portion 53. The sealing portion 55a protrudes radially outward in a flange-like manner along the entire circumference of the upper outer circumferential surface of the mounting portion 55b, and always contacts the inner circumferential surface of the cylindrical portion 45 while elastically deforming along its entire circumference, regardless of whether the valve unit 50 is open or closed. Specifically, the sealing portion 55a contacts the inner circumferential surface of the cylindrical portion 45 below the gas inlet / outlet 45c, regardless of whether the valve unit 50 is open or closed. The outer periphery packing 55 of the hole prevents fluid (air or liquid) from entering or leaving the space between the internal space Sp of the cylindrical portion 45 and the space Sq on the inclined surface on the outer periphery of the hole-forming portion 53, leaving communication only through the through hole 53h. The outer periphery packing 55 of the hole is made of an elastic material such as heat-resistant rubber such as silicone rubber or an elastomer.

[0043] As shown in Figures 5 and 9, the valve housing 54 houses the sealing valve 35 below the through hole 53h of the hole forming section 53. The valve housing 54 covers the side circumferential surface of the sealing valve 35 and has a conical shape with a diameter that decreases towards the bottom. The valve housing 54 has multiple openings, or opening windows 54a, which expose a part of the side circumferential surface of the sealing valve 35. The multiple opening windows 54a are arranged in a circumferential direction, and each opening window 54a has a triangular shape such that its circumferential width increases towards the top. The upper side of the valve housing 54 widens radially outward to surround the central axis C and is connected to the lower side of the umbrella-shaped section 57 so as to align its center with the central axis C.

[0044] The sealing valve 35 is made of metal, such as stainless steel, and is housed in the valve housing 54. As shown in Figure 10, the sealing valve 35 is conical in shape, with its diameter decreasing towards the bottom, and comprises a flat upper surface 35a and a side wall portion 35b that extends conically from slightly below the outer circumference of the upper surface 35a. The upper surface 35a of the sealing valve 35 faces the through hole 53h on the lower surface of the hole forming portion 53 with a gap between them. The shape of the side wall portion 35b and the lower end portion of the sealing valve 35 corresponds to the shape of the inner surface of the valve housing portion 54 in the umbrella-shaped portion 57. Therefore, when the electric kettle 10 is upright (see Figure 3(a)), the sealing valve 35 moves downward along the conical shape on the inner circumference of the valve housing portion 54 due to gravity, and is always positioned directly below the center of the hole-forming portion 53, which is on the central axis C. The upper surface 35a of the sealing valve 35 is a plane parallel to the lower surface of the hole forming portion 53 and is formed with a larger area than the through hole 53h. Specifically, the upper surface 35a of the sealing valve 35 is formed with an area that can cover the entire through hole 53h when the electric kettle 10 tips over. When the electric kettle 10 is upright (see Figure 3(a)), gravity causes the upper surface 35a of the sealing valve 35 to be positioned away from the through-hole 53h of the hole-forming section 53 without blocking it. At this time, a gap Sk is formed between the upper surface 35a of the sealing valve 35 and the lower surface of the hole-forming section 53, and this gap Sk and the through-hole 53h allow communication between the inside and outside of the container body 20. The length of the gap between the upper surface 35a of the sealing valve 35 and the hole-forming section 53 when the electric kettle 10 is upright (see Figure 3(a)) is approximately 15% of the maximum radial length and maximum height length of the sealing valve 35. Therefore, the sealing valve 35 does not extend outside the hole-forming section 53 in either the upright or inverted state of the electric kettle 10 (see Figure 4). The sealing valve 35 can move inside the valve housing 54 whether the electric kettle 10 is upright or tilted to its side (see Figure 11), or inverted (see Figure 4). Unless otherwise specified, the following description will refer to both the tilted and inverted states as the "overturned state." Furthermore, if the electric kettle 10 is tilted beyond a certain point, such as when it tips over, the sealing valve 35 slides upward, and its upper surface 35a blocks the through-hole 53h of the hole-forming section 53. Specifically, when the electric kettle 10 is tilted beyond a certain point, such as when it tips over, the orientation of the electric kettle 10 (sealing valve 35) relative to gravity changes, causing the sealing valve 35 to move inside the valve housing section 54 due to gravity. At this time, the direction of movement of the sealing valve 35 is upward when upright as shown in Figures 3(a) and (b), and downward when inverted as shown in Figure 4, and the sealing valve 35 moves along the conical cylindrical slope on the inner surface of the valve housing section 54 due to gravity. When the sealing valve 35 moves, its upper surface 35a and the area surrounding the through-hole 53h on the lower surface of the hole-forming section 53 come into surface contact, eliminating the gap Sk mentioned above, thereby preventing liquid from flowing into the through-hole 53h when the kettle is tipped over. Furthermore, the sealing valve 35 has a conical shape, with its diameter decreasing towards the bottom, so its center of gravity is biased towards the upper side (top surface 35a side). As a result, the sealing valve 35 can easily move even when the electric kettle 10 is only tilted at a shallow angle (not tilted very much), allowing it to more quickly come into contact with the lower surface of the hole-forming portion 53 and seal the through-hole 53h when the kettle tips over.

[0045] As shown in Figures 2 and 5, the umbrella-shaped portion 57 is integrally formed with the valve housing portion 54, is positioned to surround the entire outer circumference of the valve housing portion 54, and has a shape that widens radially outward as it moves downward. The umbrella-shaped portion 57 includes a water-stopping portion 51 and a guide inclined surface 56. The water-stopping portion 51 contacts the packing 37 all around when the valve unit 50 is in the closed position (see Figure 3(a)), and moves downward away from the packing 37 when the valve unit 50 is in the open position (see Figure 3(b)). The water-stopping portion 51 is located on the radially outer upper surface of the umbrella-shaped portion 57 (guide inclined surface 56), has a horizontal plane shape, and is annular in shape, similar to the packing 37.

[0046] The guide inclined surface 56 is formed to receive water accumulated in the space Sq on the inclined surface when the valve unit 50 moves from the closed position to the open position, as well as any remaining water when liquid is poured from the spout 42, and return it to the container body 20. The guide inclined surface 56 is formed around the entire circumference of the upper surface of the umbrella-shaped portion 57 and is inclined so as to progress downwards as it moves radially outward.

[0047] In the valve unit 50, the shaft portion 52, the connecting portion 58, and the hole-forming portion 53 are integrally formed from resin, and the umbrella-shaped portion 57 and the valve housing portion 54 are integrally formed from resin. These two integrally formed parts are integrated by fitting the upper outer circumference of the umbrella-shaped portion 57 into the peripheral wall portion 53a of the hole-forming portion 53.

[0048] (action) Next, we will explain how to use the electric kettle 10. The user removes the stopper 30 from the container body 20, fills the container body 20 with water, and then attaches the stopper 30 to the opening 20a of the container body 20. Then, by placing the electric kettle 10 on the power plate 60 and operating the control panel 63, the water inside the electric kettle 10 is heated by the heating unit 24. At this time, steam is generated from the water inside the container body 20, and the steam is discharged to the outside along the steam flow path R2 shown in Figure 3(a). The steam flow path R2 is a path that goes from inside the container body 20 through the stopper 30 to the outside, and is formed in the following order: inside the container body 20 → gap Sk between the upper surface 35a of the sealing valve 35 and the lower surface of the hole forming part 53 → through hole 53h of the hole forming part 53 → internal space Sp → gas inlet / outlet 45c. Furthermore, condensation water associated with steam flowing into the internal space Sp is returned to the inside of the container body 20 via the path indicated by arrow A3 in Figures 3(a) and (b). This path indicated by arrow A3 is formed in the following order: internal space Sp → through hole 53h of hole forming section 53 → gap Sk between the upper surface 35a of sealing valve 35 and the lower surface of hole forming section 53 → inside of container body 20. This path indicated by arrow A3 is open when the electric kettle 10 is upright, regardless of whether the valve unit 50 is open or closed.

[0049] When the water in the electric kettle 10 boils, the power supply to the heating unit 24 is stopped, and heating stops. Next, the user lifts the electric kettle 10 by grasping the handle 23. Then, the user presses down the operating part 31a of the operating lever 31 with their thumb, causing the upper end of the shaft part 52 to be pushed downward on the lower surface of the operating body part 31b, and the valve unit 50 moves downward from the closed position shown in Figure 3(a) to the open position shown in Figure 3(b). At this time, the shaft part 52 moves downward together with the biasing member housing cylinder part 36, so the biasing member 32 contracts, and the valve unit 50 moves downward against the biasing force of the biasing member 32. When the valve unit 50 reaches the open position, the water-stopping part 51 moves downward away from the packing 37 it was in contact with, and the liquid flow path R1 opens. As a result, the space Sq on the inclined surface opens into the container body 20 through the gap Sj between the water-stopping part 51 and the packing 37. The liquid flow path R1 is a path that goes from inside the container body 20 through the stopper 30 to the outside, and is formed in the order of inside the container body 20 → gap Sj → liquid passage hole 45i → spout 42.

[0050] Then, the user, while maintaining the position of pressing down the operating part 31a with their thumb, tilts the electric kettle 10 so that the spout 42 is pointed downwards, causing the hot water inside the electric kettle 10 to be discharged to the outside along the liquid flow path R1 and poured into a container such as a cup. At this time, air flows from the outside into the internal space Sp via the intake flow path R3 in a manner that replaces the hot water, enabling smooth discharge of hot water in the liquid flow path R1. The intake flow path R3 is formed in the following order: gas inlet / outlet 45c → internal space Sp → through hole 53h of the hole forming part 53 → gap Sk between the upper surface 35a of the sealing valve 35 and the lower surface of the hole forming part 53 → inside the container body 20.

[0051] After pouring hot water from the electric kettle 10, the user returns the electric kettle 10 to an upright position and removes their thumb from the operating part 31a. This causes the valve unit 50 to return to the closed position due to the biasing force of the biasing member 32. At this time, the water-stopping part 51 comes into contact with the packing 37, closing the liquid flow path R1.

[0052] When the operating lever 31 is not operated, the valve unit 50 maintains the closed position, and the liquid flow path R1 remains closed. Therefore, even if the electric kettle 10 tips over, the hot water inside the electric kettle 10 will not be discharged to the outside through the liquid flow path R1. Furthermore, as shown in Figure 4, if the electric kettle 10 is tilted beyond a certain point, such as when it tips over, the upper surface 35a of the sealing valve 35 comes into contact with the lower surface of the hole forming portion 53, blocking the through hole 53h. As a result, the open steam passage R2 closes, and as indicated by arrow A4 in Figure 4, hot water does not enter the internal space Sp when the kettle tips over, and hot water is not discharged to the outside. Figure 4 shows an example where the electric kettle 10 is upside down, but the sealing valve 35 similarly blocks the through hole 53h when the electric kettle 10 tips over on its side. If the electric kettle 10 is knocked over forcefully, there is a risk that a small amount of hot water may enter the internal space Sp before the sealing valve 35 closes the through hole 53h, but the hot water will remain in the internal space Sp during this time. When the electric kettle 10 is returned to an upright position, the hot water that remains in the internal space Sp will then follow the same path as the condensation water described above. In other words, it will return to the container body 20 through the through hole 53h, as shown by arrow A3 in Figures 3(a) and (b).

[0053] Furthermore, as shown in Figure 11, when the electric kettle 10 is tipped over (on its side) so that its outer surface is in contact with the mounting surface T, the mass of the rear side with the handle 23 is greater than the mass of the front side with the spout 42. As a result, the outer surface of the electric kettle 10 and a part of the handle 23 come into contact with the mounting surface T, and the spout 42, which is on the opposite side of the handle 23, faces away from the mounting surface T (away from gravity). Therefore, even when the electric kettle 10 is tipped over, the water accumulated in the internal space Sp is less likely to be discharged to the outside from the spout 42.

[0054] (effect) According to the embodiment described above, the following effects are achieved. (1) An example of a liquid heating container is an electric kettle 10, which comprises a container body 20 having a heating section 24 for heating the liquid contained inside and an opening 20a that opens upward, and a stopper 30 configured to open and close the opening 20a of the container body 20. The stopper 30 is located at the end of a liquid flow path R1 that passes through the stopper 30 and includes a spout 42 formed for pouring the liquid inside the container body 20 to the outside, a valve unit 50 for opening and closing the liquid flow path R1, and an operating section 31a that is operated to move the valve unit 50 so that the liquid flow path R1 is opened and closed. The valve unit 50 includes a sealing valve 35 for opening and closing a steam flow path R2 that passes through the stopper 30, a valve housing section 54 for housing the sealing valve 35, and a hole forming section 53 having a through hole 53h that is closed by the sealing valve 35 to close the steam flow path R2 when the electric kettle 10 is tipped over, and opened to open the steam flow path R2 when the electric kettle 10 is upright. The valve unit 50 is located in the center of the opening 20a with the stopper 30 attached to the container body 20 and extends vertically, and includes a shaft portion 52 that moves vertically when the operating portion 31a is operated. The hole forming portion 53, sealing valve 35, and valve housing portion 54 are located on the extension axis of the shaft portion 52 and are positioned lower to the bottom of the container body 20 than the shaft portion 52. With this configuration, since the sealing valve 35 is provided in the valve unit 50, the plug body 30 can be made more compact compared to a configuration in which the sealing valve is provided separately from the valve unit. Furthermore, with this configuration, the sealing valve 35 and the valve housing 54 are positioned so as to overlap with the extension axis of the shaft 52. Specifically, even if the electric kettle 10 tips over, the upper surface 35a of the sealing valve 35 is positioned so as to face the through hole 53h in the vertical direction, regardless of the position of the sealing valve 35 within the valve housing 54, and is positioned within a range that can cover the entire through hole 53h, by overlapping with the extension axis of the shaft 52. Ideally, as shown in Figures 3 and 4, the through hole 53h, the sealing valve 35, and the valve housing 54 should be positioned so as to overlap in a straight line with their respective central axes aligned on the extension axis of the shaft 52. This makes it possible to make the radial size of the stopper body 30 more compact compared to the configuration described in Patent Documents 1 and 2 above, where the valve that closes the steam passage when the kettle tips over is located outside the valve that opens and closes the hot and cold water passage. Furthermore, because the heavy metal sealing valve 35 is located on the extension axis of the shaft portion 52, which is in the center of the opening 20a, the radial weight balance of the plug body 30 is suppressed.

[0055] (2) On the opposite side of the through hole 53h from the sealing valve 35 inside the stopper body 30, an internal space Sp is formed as part of the steam flow path R2. The hole forming portion 53 is formed so that, regardless of whether the liquid flow path R1 is opened or closed by the valve unit 50, when the electric kettle 10 is upright, the liquid accumulated in the internal space Sp is returned to the container body 20 through the through hole 53h. With this configuration, water accumulated in the internal space Sp due to condensation or tipping over can be returned to the container body 20, and leakage of water accumulated in the internal space Sp to the outside of the stopper body 30 is suppressed.

[0056] (3) The liquid flow path R1 and the vapor flow path R2 each follow separate paths, and the end of the vapor flow path R2 is formed to be on the same side in the circumferential direction with respect to the central axis C as the end of the liquid flow path R1, which is the spout 42. With this configuration, steam is discharged to the outside from the gas inlet / outlet 45c and liquid is discharged from the spout 42, allowing for a compact design. Furthermore, the discharge of hot steam from the spout 42 prevents hot steam from being released towards the handle 23 that the user holds. Furthermore, in the electric kettle 10, the rear side, where the handle 23 is located, has a greater mass than the front side, where the spout 42 and gas outlet 45c are located. Therefore, even if the electric kettle 10 is tipped over, the outer surface of the electric kettle 10 and a part of the handle 23 will be in contact with the mounting surface T, and the spout 42, which is on the opposite side of the handle 23, will face away from the mounting surface T (away from gravity). As a result, water accumulated in the internal space Sp is less likely to be discharged to the outside through the gas outlet 45c.

[0057] (4) On the opposite side of the through hole 53h from the sealing valve 35 inside the stopper body 30, an internal space Sp is formed as part of the steam flow path R2. The valve unit 50 is attached to the shaft portion 52 and includes a shaft packing 59 to prevent liquid from flowing out of the internal space Sp when the container body 20 is tipped over, and a hole outer circumference packing 55 attached to the outer circumference of the hole forming portion 53 to prevent liquid from returning to the container body 20 from the internal space Sp through a route other than the through hole 53h. The stopper body 30 includes a cylindrical portion 45 that surrounds the outer circumference of the internal space Sp. The cylindrical portion 45 has a gas inlet / outlet 45c located between the shaft packing 59 and the hole outer circumference packing 55, which serves as the end of the steam flow path R2 that leads from the internal space Sp to the outside. Inside the stopper body 30, an intake flow path R3 is formed in the opposite direction from the steam flow path R2 to allow air to enter the container body 20 when pouring the liquid from the container body 20 to the outside. In this configuration, the gas inlet / outlet 45c is formed as the end of the steam flow path R2 and the beginning of the intake flow path R3. Since the gas inlet / outlet 45c is always connected to the outside space, the flow of steam or air is smooth.

[0058] (5) The container body 20 has a shape in which the outer diameter of the container body 20 decreases as it goes upwards. With this configuration, as described in (1) above, the diameter of the opening 20a of the container body 20 becomes smaller, improving heat retention performance, and allowing the stopper body 30 to be made more compact to match the opening 20a. Furthermore, the compact stopper body 30 makes the electric kettle 10 itself lighter, and in particular reduces the weight of the upper part of the electric kettle 10, improving its stability when upright.

[0059] (6) The electric kettle set 1 comprises an electric kettle 10, which is an example of a liquid heating container, and a power supply plate 60 on which the electric kettle 10 can be placed and which supplies power for heating to the heating unit 24 when the electric kettle 10 is placed on it. This configuration allows for a more compact design, as described above.

[0060] This disclosure is not limited to the embodiments and drawings described above. Modifications (including the deletion of components) can be made as appropriate, provided they do not alter the essence of this disclosure. An example of such a modification is described below.

[0061] (modified version) The operating lever 31 in the above embodiment is not limited to a lever type, but may also be a push button type. In this case, the liquid flow path R1 may switch between a closed state and an open state with each press of the push button. In the above embodiment, the stopper 30 was attached to and detached from the opening 20a of the container body 20 by a screw mechanism, but it may also be attached and detached from the opening 20a of the container body 20 by a hinge mechanism. Alternatively, the stopper 30 may be attached and detached by a so-called one-touch mechanism, where it can be removed by pinching the operating part provided at the top of the opening 20a of the container body 20 and lifting it upwards. In the above embodiment, the outer diameter of the container body 20 was shaped to decrease as it went upwards, but the outer diameter of the container body 20 may be constant in the vertical direction. In the above embodiment, the liquid flow path R1 and the vapor flow path R2 may have their respective terminals configured in different directions in the circumferential direction. In this case, for example, the gas inlet / outlet 45c may be located at a position circumferentially away from the spout 42. In the above embodiment, the position, size, or shape of the gas inlet / outlet 45c can be changed as appropriate. In the above embodiment, the outer circumferential packing 55 and the gas inlet / outlet 45c may be omitted. In this case, when the valve unit 50 is in the open position (see Figure 3(b)), the shaft packing 59 detaches from the inner circumferential surface of the packing housing cylinder 45b, and when hot water is poured, air may enter the container body 20 through the gap between the shaft 52 and the shaft passage hole 36h via the internal space Sp and the through hole 53h. In this configuration, steam reaches the outside through the liquid passage hole 45i, passing through the gap between the inner circumferential surface of the cylinder 45 and the outer circumferential surface of the hole forming portion 53, rather than through the gas inlet / outlet 45c. In the above embodiment, the through hole 53h, the sealing valve 35, and the valve housing 54 were aligned with their respective central axes on the extension axis of the shaft portion 52. However, it is sufficient that some part of the through hole 53h, the sealing valve 35, and the valve housing 54 overlaps with the extension axis of the shaft portion 52, and their respective central axes do not need to be aligned. In the above embodiment, the sealing valve 35 is not limited to metal but may be made of resin. Furthermore, the shape of the sealing valve 35 is not limited to a cone shape but may also be a frustoconical shape, a polygonal pyramid, or other shapes. Furthermore, the electric kettle 10 and the power plate 60 may be an integrated electric pot. [Explanation of Symbols]

[0062] 1…Electric kettle set, 10…Electric kettle, 20…Container body, 20a…Opening, 20b…Screw part, 21…Inner container, 22…Outer container, 23…Handle, 24…Heating part, 25…Conductive part, 30…Stopper, 30b…Screw part, 31…Operating lever, 31a…Operating part, 31b…Operating body part, 31c…Hinge plate part, 31d…Locking part, 31e…Rotating shaft part, 32…Biasing member, 35…Seal Valve, 35a...top surface, 36...biasing member housing cylinder, 36a...cylindrical part, 36b...ceiling part, 36h...shaft passage hole, 36i...protrusion, 37...packing, 40...stopper body part, 41...circumferential wall part, 41a...locking part, 42...spout, 44...operation support wall part, 44h...hinge hole, 45...cylinder part, 45a...recess, 45b...packing housing cylinder part, 45c...gas inlet / outlet, 45h...through hole, 45i ...Liquid passage hole, 46...Inner bottom plate section, 47...Packing mounting section, 50...Valve unit, 51...Water-stopping section, 52...Shaft section, 52a~52c...1st~3rd groove sections, 52d...Retaining groove, 52e...Ventilation recess, 52f...Mounting recess, 53...Hole forming section, 53a...Peripheral wall section, 53b...Mounting recess, 53h...Through hole, 54...Valve housing section, 54a...Opening window section, 55...Packing on the outer circumference of the hole, 55a...Seal Part, 55b...Mounting part, 56...Guide inclined surface, 57...Umbrella-shaped part, 58...Connecting part, 59...Shaft packing, 59a...Seal part, 59b...Mounting part, 60...Power plate, 61...Mounting surface, 62...Power supply part, 63...Operation panel, C...Central axis, J...Operation rotation axis, R1...Liquid flow path, R2...Steam flow path, R3...Intake flow path, Sj,Sk,Sq...Gap, Sp...Internal space, Sq...Space on inclined surface

Claims

1. A liquid heating container, A container body having a heating section for heating the liquid contained inside, and an opening that opens upwards, The container body comprises a stopper configured to open and close the opening, The aforementioned plug body, A spout is located at the end of the liquid flow path passing through the stopper body and is formed for pouring the liquid inside the container body to the outside, A valve unit that opens and closes the liquid flow path, The system includes an operating unit which is operated to move the valve unit so that the liquid flow path is opened and closed, The valve unit is A sealing valve that opens and closes a steam passage that passes through the inside of the plug, A valve housing section that houses the sealing valve, A hole-forming portion having a hole that is closed by the sealing valve to close the steam passage when the liquid heating container is inverted, and opened to open the steam passage when the liquid heating container is upright, The stopper extends vertically when attached to the opening of the container body, and includes a shaft portion that moves vertically when the operating portion is operated, The hole-forming portion, the sealing valve, and the valve housing portion are positioned on the extension axis of the shaft portion and are located lower to the bottom of the container body than the shaft portion. Liquid heating container.

2. An internal space is formed as part of the steam flow path on the opposite side of the sealing valve from the hole-forming portion within the plug body. The hole-forming portion is formed such that, regardless of whether the liquid flow path is opened or closed by the valve unit, the liquid heating container, when upright, returns the liquid accumulated in the internal space to the container body through the hole. A liquid heating container according to claim 1.

3. The steam channel and the liquid channel each follow separate paths, and the end of each channel is formed to be on the same side in the circumferential direction with respect to the central axis of the shaft. A liquid heating container according to claim 1.

4. An internal space is formed as part of the steam flow path on the opposite side of the sealing valve from the hole-forming portion within the plug body. The valve unit is A shaft packing is attached to the shaft portion to prevent liquid from flowing out of the internal space when the car tips over, The system includes a hole-outer side packing attached to the outer circumference of the hole-forming portion to prevent the liquid in the internal space from returning to the container body from any point other than the hole, The plug body comprises a cylindrical portion surrounding the outer circumference of the internal space, The cylindrical portion has a gas inlet / outlet formed between the shaft packing and the outer circumference packing of the hole, which are arranged in the vertical direction, and which serves as the end of the steam passage that leads from the internal space to the outside. Within the stopper body, an intake passage is formed in a path that reverses direction from the vapor passage, allowing air to be drawn into the container body when the liquid inside the container body is poured out. A liquid heating container according to claim 1.

5. The container body has a shape in which the outer diameter of the container body decreases as it approaches the upper side, which is the opening side. A liquid heating container according to claim 1.

6. An electric kettle which is a liquid heating container according to any one of claims 1 to 5, The system comprises a power supply plate on which the electric kettle can be placed, and which supplies power for heating to the heating section when the electric kettle is placed on it. Electric kettle set.

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