JPH0515871Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a heater attachment device for an electric hot water storage container such as an electric pot.

(Prior art) In this type of hot water storage container, a heater is applied to the lower surface of the bottom of the container, and the content liquid is heated by this heater.
Recently, boiling water and keeping it warm have been practiced (Special Publication No. 62-6806).

However, in this method, in order to hold the heater in contact with the lower surface of the bottom of the hot water storage container, the heater is held between the hot water storage container and a back plate attached to the hot water storage container in a manner that covers the heater from a flat surface. Although it has a complicated structure and is relatively expensive, it has poor adhesion between the heater and the hot water storage container, which causes problems in direct heat conduction to the hot water storage container.

Therefore, the present inventors devised and proposed a method in which the heater is held under pressure by a mounting member attached to the hot water storage container, thereby increasing the adhesion between the heater and the hot water storage container and improving direct heat conduction.

(Problem that the invention aims to solve) However, although the heater has better adhesion to the hot water storage container and improved direct thermal conductivity, the heat from the back side, which is far from the hot water storage container, is not fully utilized, and the thermal efficiency is still insufficient. Otherwise, localized overheating may occur in the heater, which will affect the life of the heater.

Recently, a type of electric hot water storage container containing an inner container equipped with a heater has been proposed and used, in which the content liquid is drawn out by a pump through a drainage path connected from the outside to the bottom of the inner container. .

However, in this case, since the liquid content is drawn out by a pump, the remaining amount of the liquid content is not clear, which tends to lead to a situation where the product continues to be used even though there is no remaining liquid content.

The present invention provides such an electric hot water storage container,
The object of the present invention is to provide an electric hot water storage container that can solve any of the problems mentioned above by improving the heating efficiency of the heater and also preventing dry cooking in connection with the heater mounting structure. It is.

(Means for solving the problems) In order to achieve the above objectives, the present invention
In an electric hot water storage container that houses an inner container having a heater and extracts the liquid content with a pump through a discharge path connected to the bottom of the inner container, a recess that protrudes into the inner container is provided on the lower surface of the bottom of the inner container. The base of the outlet path is connected to the recessed part to open into the inner container, and the heater is positioned by closely fitting into the recessed part together with a backing plate member applied from the back of the heater. , the inner container is pressed and held via the contact plate member by a heater mounting member attached to the inner container.

(Function) According to the above structure of the present invention, the heater is positioned by closely fitting the recess on the lower surface of the bottom of the inner container with the backing plate member applied to the back of the heater, so a special positioning structure is used. The inner container is properly positioned without any additional work, and is brought into close contact with the inner container together with the backing plate member that is applied from the back around the recessed portion. Since the heater's inner container is well-retained, the heat from the body surface between the heater's inner container and the inner container is transferred directly to the inner container, and the heat from the heater's non-body surface from the inner container is transferred to the inner container via the back plate member. Heat is conducted, and the heat from both sides of the heater can be effectively used to heat the content liquid through the concave portion that protrudes into the inner container and is in a state where it is easy to exchange heat with the content liquid.

In addition, the base of the outlet path is connected to the concave part that protrudes into the inner container and opens, so this opening position is higher than the lowest part of the inner container, and even when the pump is working, it is lower than this opening position. The liquid inside the container cannot be drawn out, and it is possible to prevent the inside of the inner container from becoming empty.

(Embodiment) The embodiment of the present invention shown in FIGS. 1 and 2 shows a case of a boiling type electric pot in which an inner container 2 having a heater 1 is housed in an outer case 4 as a hot water storage container.

The inner container 2 and the outer case 4 are connected at the upper end by a shoulder member 3 made of synthetic resin, and at the lower end by a connecting fitting (not shown) and a bottom member 5 made of synthetic resin. A container body 6 is formed.

A discharge port 7 for discharging the liquid content to the outside is integrally assembled to the shoulder member 3 in a structure with a built-in overturning water stop valve 8, and a shaft 1 is attached to the rear hook-shaped bearing 9 of the shoulder member 3.
0, the outer cover 11 is pivotally attached so as to be openable/closed and detachable. An inner cover 12 applied to the mouth 2a of the inner container 2 is attached to the lower surface of the outer cover 11.
It opens and closes in one piece.

A bellows pump 14 is provided inside the outer cover 11 and is operated by the upper pressing plate 13 of the outer cover 11. Pressurized air is sent into the container 2 to pressurize the liquid inside. The air supply passage 16 is provided with a steam release passage 18 that exits to the upper surface of the outer cover 11 through a branch hole 17, and allows steam generated during heat retention and boiling by the heater 1 to escape to the outside to prevent abnormal pressure rise in the inner container 2. It's getting old.

The branch hole 17 is switched and closed to the air supply port 19 of the bellows pump bottom plate 15 by a valve 39 that is moved down in conjunction with the pressing operation of the bellows pump 14, so that pressurized air is released into steam when the content liquid is pressurized. Extraction passage 18
This prevents steam from escaping to the bellows pump 14 or from entering the bellows pump 14 when hot water is stored.

An outlet passage 20 for guiding the pressurized liquid to the outside and above of the inner container 2 is provided with its base end connected to the bottom of the inner container 2, communicating with the inner container 2 at the bottom and having an upper end open to the outside. Inner container 2
The liquid inside always flows in to maintain the same level, and a transparent tube 28 forms a liquid level display part in the middle.

An elbow 2 made of an elastic body is provided at the upper end of the lead-out path 20.
1 is connected. This elbow 21 is connected to an inverted U-shaped tube 23 fixed to the back side of a beak-shaped portion 3a of the shoulder member 3 that extends to one side. Inverted U-shaped tube 23
A slit 26 is formed on the front side of the downward discharge port 7 at the tip, and extends from the lower end to a position above the full water position of the inner container 2. A pipe cover 27 that surrounds the beak 3a is provided below the beak 3a of the vessel 6, and is fitted onto the beak 3a and the outer case 9 of the vessel 6. A liquid injection guide tube 24 is detachably attached to the bottom of the pipe cover 27 from below, which receives the liquid discharged from the discharge port 7 of the inverted U-shaped tube 23 in an open state to the atmosphere and causes it to flow downward.

The slit 26 is also involved in this open reception to the atmosphere, which reliably prevents siphon splash and the ejection of the contents in the event of rapid dispensing. The liquid injection guide tube 24 is removably fitted into the beak-shaped portion 3a of the shoulder member 3, and comfortably receives the liquid discharged from the discharge port 7 with a slightly large diameter.

Although a check valve 29 is provided in the air supply passage 16, the check valve 29 may become temporarily unstable during a fall and may cause the contents to flow out. Therefore, in addition to the air supply port 19 of the bellows pump bottom plate 15, the air supply passage 16
An auxiliary communication hole 30 is provided that leads to the weight valve 2.
2 is pushed open, the steam flows into the bellows pump 14 through the auxiliary communication hole 30, and is prevented from flowing out to the side of the steam vent passage 18 with the branch hole 17 closed.

Note that the steam vent passage 18 has a vessel body 6 in a part thereof.
By having the detour part 18a that is higher than the full water level It is possible. A steam sensor 38 is made to protrude from the back side of a part of the shoulder member 3, and faces the inside of the steam vent passage 18 through a through hole 18b of the part, so as to detect boiling of the content liquid based on the steam temperature.

The heater 1 is composed of a heat-retaining heater wire and an insulating heater base around which the boiling heater wire is wound, and is formed into a flat disk shape with a through hole 1a in the center.

The part of the inner container 2 where the heater 1 is provided is the bottom part 2b.
A recess 2c is press-formed at the center of the lower surface of the inner container 2 so as to protrude into the inner container 2. A ceiling surface 2d of the recess 2c is formed into a flat surface, and a flat portion of the heater 1 is placed against this ceiling surface 2d. At the back of the heater 1, there is a back plate member 3 made of aluminum with good thermal conductivity.
1 and press the contact plate member 31 from the back of the heater mounting plate 33 via the spring member 32.
is provided. The heater mounting plate 33 has a spring member 3
By spot welding the base end portions 32a and 32b of the inner container 2, or by simply sandwiching them between the heater 1 and the backing plate member 31, the heater 1 is held pressed against the inner container 2. Therefore, the heater mounting plate 33 is attached to the inner container 2 with screws 36 at several points on its outer circumference.
It is installed by This attachment is performed to a mounting fitting 37 attached to the bottom of the inner container 2 by spot welding.

The contact plate member 31 and the heater mounting plate 33 have through holes 31a and 33a in the center like the heater 1, and the heater 1
A heat-sensitive controller 34 is attached to the lower center of the bottom of the inner container 2 by using the through hole 1b of the inner container 2, and the outside thereof is covered with a heat insulating case 35 having a double wall structure with a gap in between to prevent direct heat from the heater 1. This allows for more accurate detection of the temperature of the liquid inside.

As shown in FIG. 2, the contact plate member 31 has a flat part 31c that is applied to the back surface of the heater 1 that is applied to the ceiling surface 2d, and an inner peripheral surface 2 of a recessed part 2c on the outer periphery of the flat part 31c.
It consists of a peripheral wall 31d that fits into the outer circumferential wall 31d, and an overhanging portion 31b extending from the heater 1 formed by partially bending the outer peripheral edge thereof outward. The plane portion 31c is
It has a notch for the lead-out path 20, and the projecting portion 31b is in contact with a portion of the outer surface 2e around the opening of the recess 2d of the inner container 2 other than where the mounting fitting 37 is attached.

The heater 1 applied to the inner container in this way is
A contact plate member 3 with good thermal conductivity that is in contact with the back of the plate
1, and is held pressed by a spring member 32 or the like by a heater mounting member separately attached to the hot water storage container, so that the overhanging portion 31b from the heater of the contact plate member 31 extends around the heater 1 of the inner container 2. touch the part. Therefore, the adhesion between the heater 1 and the inner container 2 is improved, and the direct thermal conductivity from the heater 1 to the inner container 2 is improved.

Further, the back plate member 31 is in close contact with the back surface of the heater 1 and receives efficient heat conduction to promote heat dissipation on the back side of the heater 1. Overhang part 31 from 1
2 is in close contact with the inner container 2 at b, and the heat radiated from the back surface of the heater 1 can be directly and efficiently transmitted to the inner container 2. As a result, the heat on the front and back surfaces of the heater 1 can be actively utilized for heating the liquid in the inner container 2.

Moreover, the recess 2 protrudes into the inner container 2 and easily exchanges heat from both sides of the heater 1 with the inner liquid.
It can be effectively used for heating the content liquid through the area around c.

Furthermore, since the area of the heater 1 to which heat should be conducted becomes larger, local overheating can be avoided, and the heater 1
has a longer lifespan.

Furthermore, since the base of the outlet path 20 is connected to the recessed portion 2c that protrudes into the inner container 2 and is open,
This opening position is higher than the lowest part in the inner container 2,
Even if the bellows pump 14 is operated, the liquid at a position lower than this opening position cannot be drawn out, which prevents the inner container 2 from becoming empty and prevents the liquid from being completely drained. This avoids situations where you suddenly end up with empty cooking without realizing it.

A microcomputer board (not shown) connected to the steam sensor 38, the heat-sensitive controller 34, the heater wire of the heater 1, etc. is provided in the downward recess 5a formed in the bottom member 5, and controls the energization of the heater 1. It's like this. Note that the temperature increase due to heating of the content liquid slows down rapidly at the point of boiling, so if the change is detected, the boiling state can be detected using only the thermal controller 34 without the steam sensor 38.

A rotating bottom plate 40 is attached to the end of the bottom member 5. The rotating bottom plate 40 has a ring body in which an annular outer wall 41, an annular inner wall 43, and lower ends are connected to each other,
It is rotatably held between the bottom member 5 and a retaining ring 45 attached to the bottom surface of the bottom member via a support fitting 46.

Here, the rotary bottom plate 40 is defined by a hooking edge 43a having an upward hook-shaped cross section on the upper edge of the interior wall 43, and a hooking ring 45.
By being engaged with the upward locking groove 45a, it is prevented from coming off, and the container body 6 will not fall off when being carried.

The rotating bottom plate 40 serves as a seating part for the vessel body 6, and the vessel body 6
When it is placed in place, the upper end of a large number of protrusions 41a erected on the inner periphery of the outer wall 41 slidably receives the downward protrusion 5b formed on the bottom member 5 of the vessel body 6, and the upper end 41b of the outer wall 41 Together with the guidance provided by the fitting of the protrusions 5b and 5b, the container body 6 can be rotated easily and stably. This rotation is caused by the connection part 5 between the electrical components on the vessel body 6 side and the external power supply provided on the rotating bottom plate 40.
For safety reasons, the connection with 0 is limited to, for example, 360° or less.

Note that the support fitting 46 is attached to the bottom member 5 and to the hanging ring 4.
5 is attached to the support fitting 46 with screws 47 and 48, respectively. A cover plate 44 is provided on the inspection window 51 formed by the interior wall 43 of the rotary bottom plate 40, and legs 49 are attached to the cover plate 44.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the above embodiment, the present invention is applied to a heater attachment device to the bottom lower surface 2b of the inner container 2, but it is also possible to implement the present invention to a heater attachment device to the side peripheral surface of the inner container 2. It is.

(Effects of the invention) According to the invention, since the heater and the back plate member applied to the back of the heater are closely fitted and positioned in the recess on the lower surface of the bottom of the inner container,
It is properly positioned without requiring any special positioning structure or work, and is brought into close contact with the inner container together with the backing plate member applied from the back around the recess, and in this state is attached to the inner container. The heater is held in place by simply pressing the heater mounting member, so the heat from the heater's body surface to the inner container is transferred directly to the inner container, and the heat from the heater's non-body surface to the inner container is transferred through the back plate member. heat is conducted to the inner container,
The heat from both sides of the heater can be effectively used to heat the liquid inside the inner container through the concave part that protrudes into the inner container and easily exchanges heat with the liquid.It is inexpensive, has good heating efficiency, and can be heated only locally. This makes it possible to create an electric hot water storage container that has a long product life and is free from disconnections due to local overheating caused by insufficient heat conduction.

In addition, the base of the outlet path is connected to the concave part that protrudes into the inner container and opens, so this opening position is higher than the lowest part of the inner container, and even when the pump is working, it is lower than this opening position. It is possible to prevent the inner container from becoming empty because the liquid inside the container cannot be drawn out, and to avoid the danger of suddenly causing an empty cooking state due to complete drawing out of the liquid. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a perspective view of the inner container with the heater mounting plate attached, with the bottom facing upward. 1... Heater, 2... Inner container, 2b... Bottom,
2c... recess, 20... lead-out path, 31... plate member, 32... spring member, 33... heater mounting member.

Claims (1)

[Scope of Claim for Utility Model Registration] In an electric hot water storage container that houses an inner container with a heater and extracts the liquid content with a pump through a discharge passage connected to the bottom of the inner container, the inner container is located under the bottom of the inner container. A recessed portion protruding inward is provided, and the base of the outlet path is connected to the recessed portion to open into the inner container, and the heater is closely connected to the recessed portion together with a backing plate member applied from the back of the heater. 1. An electric hot water storage container characterized in that the container is fitted and positioned, and is pressed and held via the contact plate member by a heater mounting member attached to the inner container.