JP2002355175A - Structure of lid for electric pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a compact and rational structure of a lid in order to improve the thermal performance and to downsize the lid without losing necessary functions. SOLUTION: The structure of the lid for an electric pot has a tank 1 for storing hot water and a lid 19 which can open and close an opening at the upper end of the tank 1 for storing hot water, and the lid 19 is equipped with an air/vapor passage 40 which links an inner space 1a in the tank 1 to the outside of the water heater. A plate 42 under the lid which is attached under the lid 19 and a main part 43 of a valve which is put under the plate 42 under the lid through a ring-shaped packing 51 are integrated with four screws 4 put vertically. An inner space 69, found inside the ring-shaped packing 51 located between the plate 42 under the lid and the main part 43 of the valve, and an outer space 70 found outside are set to be connected serially, and the passage 40 for fluid is formed. Four screws 4 are placed outside the ring-shaped packing 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric kettle such as an electric kettle, and more particularly to a technique for rationalizing and reducing the size of a cover.

[0002]

2. Description of the Related Art The lid of an electric water heater is provided with a storage tank for introducing air for allowing the stored hot water to be discharged to the outside and for releasing steam when boiling to the outside of the water heater. A passage that connects the internal space with the outside of the water heater (air,
A lid structure portion in which a vapor path is formed is configured. A possible example of the structure will be described with reference to FIG. 7. As a three-layer structure in which a plug main body 43 and a plug inner lid 44 are stacked and assembled in this order below the lid lower plate portion 42, The space 69 between the part 42 and the plug main body 43, the plug main body 43 and the plug inner lid 4
4, outer ring space 70, lid 19
The internal space of the tank 1 and the outside of the water heater are configured to communicate with each other through a maze-like path 40 formed by a steam passage slit 72 formed on the rear side of the tank.

In this case, a structure is adopted in which the lid lower plate portion 42, the plug main body 43, and the plug inner lid 44 are fixed together by screws 4, but conventionally, as shown in FIG. Lower plate part 42
Ring-shaped first packing (reference numeral 51 in FIG. 7) interposed between the plug body 43 and the plug main body 43, and a ring-shaped second packing 58 interposed between the plug main body 43 and the plug inner lid 44. And a screw stopper by a screw 4 is provided outside the both loops.

[0004]

As described above, the reason why the screw stop is provided outside the packing is that the screw stop position is as far as possible from the center position (the center of the packing) as far as possible from the center or at an equal angle to the center. Tightening at three or four intervals is because of a good structural balance. On the other hand, it is desirable that the diameter of the first packing in the plug body be as small as possible within a range in which performance such as outflow of hot water due to overturning and spontaneous discharge can be ensured. In other words, in order to satisfy both of these requirements, a structure in which screws are fixed outside the packing was favorable.

However, in order to form a maze of the air / steam path in a planar manner due to conditions such as vertical height restrictions, a ring-shaped path (see an outer ring space 70 shown in FIG. 7) is provided outside the first packing. Although it is convenient to provide, in the conventional structure, the screw hole projection formed on the lower plate of the lid for screwing is arranged in the ring-shaped path, so that a sufficient passage area is required to secure a sufficient passage area. The outer diameter of the shape path, that is, the outer diameter of the lid structure, tended to increase easily for its required function.

[0006] In order to further improve the heat retention, when the diameter of the upper part of the cylindrical storage tank with a bottom is to be reduced and the opening area is to be reduced, the absolute diameter of the lid structure is reduced. Must be changed, and there is still room for improvement in that respect. or,
In order to prevent steam leakage from the screw holes, each screw stop requires an extremely small number of seal rings, such as O-rings, as many as the number of screws, and it takes time to assemble the small parts. It was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to realize a compact and rationalized lid structure without impairing necessary functions in order to improve heat insulation, improve heat insulation efficiency, or reduce the size of a lid. is there.

[0008]

According to a first aspect of the present invention, there is provided a tank including a tank capable of storing a liquid and a lid capable of opening and closing an opening at an upper portion of the tank, and communicating an internal space of the tank with an outside of the water heater. In a lid structure of an electric water heater in which a fluid passage to be formed is formed in a lid, a first structural frame provided at a lower portion of the lid is overlapped with a lower surface side of the first structural frame via a sealing member A. The second structural frame is integrated using a plurality of vertically oriented screw members, and an inner space formed inside the seal member between the upper and lower portions of the two structural frames, and the seal member between the upper and lower portions of the two structural frames. And a fluid path is formed by communicating with an outer space formed outside the seal member, and a plurality of screw members are arranged inside the seal member.

According to a first aspect of the present invention, there is provided the first
A screw member for fixing the two structural frames relative to each other is disposed outside a seal member A for forming two types of inner and outer spaces serving as fluid paths between the second structural frame and the second structural frame.
According to this, since the screw stop does not exist in the outer space portion which becomes the ring-shaped path, the radial width of the outer space portion can be reduced as compared with the related art. In addition, the inner space has relatively more space than the outer space, even when the structural parts such as the water stop valve and the valve for the hot water supply mechanism by air pressure are arranged. In addition, even if the screw stop portion is present, the diameter (lateral dimension) as the inner space portion does not need to be increased.

[0010] As a result, the diameter of the lid structure can be reduced as much as the diameter of the outer space can be reduced without impairing the function as a fluid path, and the absolute diameter can be reduced. As a result, the above-mentioned deterioration of the balance (the radial position of the screw stopper relative to the diameter as the lid structure) due to the screw stopper being more inward than in the related art can be offset, and the screw can be firmly fixed. in addition,
Since the screw stop is disposed inside the seal member A, a seal ring such as an O-ring is not required for the screw stop, so that the cost can be reduced accordingly.

According to a second aspect of the present invention, in the first aspect, a screw member is configured to be screwably attached to a screw hole projection protruding from the first structural frame, and is screwed to the screw hole projection in the second structural frame. Screw holes are formed at corresponding locations to allow the screw member to be inserted, and the second structural frame is provided with a cover surrounding the screw hole protrusion in a state where the two structural frames are assembled. Is what you do.

According to the second aspect of the present invention, since the screw hole projection is provided in the first structural frame which is relatively upper, the second structural frame is simply provided with a hole, and operation is performed from below through the hole. A simple screwing structure in which the two structural frames are screwed and fixed by the screw member to be used can be adopted. In this case, in the assembled state, the screw hole projection which is a relatively small diameter and is a large protruding cantilever support structure is surrounded by the cover formed on the second structural frame.
The covering portion can function as a guard member that protects the screw hole projections with strength or from the heat of steam.

According to a third aspect of the present invention, in the configuration of the first or second aspect, a substantially bottomed cylindrical shape covering the lower side and the lateral side of the second structural frame, and the fluid passage and the internal space of the tank are formed. A third structural frame having a communicating portion for communicating with the lower surface side of the second structural frame is configured to be mounted on the lower surface side of the second structural frame with a screw member so that the third structural frame can be mounted freely. It is characterized in that it is formed in such a size that it can be fitted into the upper end of the internal space of the tank formed in such a state.

According to the third aspect of the present invention, since the third structural frame in the shape of a deep dish that covers the lower surface side of the second structural frame is provided, a fluid path is provided between the second and third structural frames. Further, it is possible to adopt a rationalized structure in which the third structural frame functions as a heat shielding member that makes it difficult for the hot water stored in the tank to affect the second structural frame (the first structural frame). The third structural frame can be fitted into the upper end portion of the tank with a reduced diameter, so that the opening area at the upper end of the tank is narrowed to improve the heat retaining property, and the lid structure is formed at a location where the opening area is narrowed. The arrangement of the parts without displacing the relative height positions enables both the consolidation arrangement, that is, the compactness. This makes it possible to improve the heat retention without increasing the height of the water heater.

According to a fourth aspect of the present invention, in the third aspect, there is provided a communication structure for projecting upward from the bottom surface of the third structural frame and communicating the fluid path and the internal space of the tank with the top surface. The portion forms a perforated recess and the second
A portion corresponding to the recessed portion in the structural frame is recessed upward.

According to the configuration of the fourth aspect, the following operation is provided. Normally, the upper limit of liquid storage in the tank, that is, the full water level, is set at a position that is separated from the lid structure by a predetermined distance downward so that the recovery of steam at the time of boiling and the escape to the outside are performed smoothly. . However, when the tank is filled with too much water, the space between the third structural frame, which is the lowermost part as the lid structural part, is eliminated or extremely small, so that the steam escape operation at the time of boiling is performed. May not be in time, and hot water may blow out from a steam release port or other gaps.

Therefore, a recessed portion is formed on the bottom surface of the third structural frame, which protrudes upward and has a communicating portion formed on the top surface thereof, corresponding to the upwardly concave portion of the second structural frame. However, a relatively large space portion and a steam escape path exist in the recessed portion, and even if water is excessively filled so as to reach the third structural frame, the pressure fluctuation at the time of boiling is reduced. Since the absorption can be reduced to some extent in the inner space, and the generated steam can be guided to the outside from the communicating portion, it is possible to avoid the above-mentioned spillover phenomenon.

According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, a sealing member B capable of sealing between the third structural frame and the upper end of the tank is wound around the outer periphery of the third structural frame. It is characterized by being equipped.

According to the fifth aspect of the present invention, since the upper end portion of the upper constricted tank and the third structural frame which can be fitted into the upper end portion have an extremely short distance in the radial direction, a third positional relationship is obtained.
By mounting the seal member B on the outer periphery of the structural frame, the seal member B can be brought into pressure contact with the upper end of the tank in a state where the lid is closed, so that the upper opening of the tank can be closed in an airtight manner. Become. That is, a dedicated member for closing the tank can be omitted.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an electric pot which is an example of an electric water heater. The electric pot includes a container body 18 having a bottomed cylindrical shape recessed from above into the inside,
A lid 19 is provided to cover the upper part of the hot water storage space 1a.

The container body 18 is a cylindrical outer case 2 having a bottom.
0 and an inner container (an example of a tank) 1 surrounding the hot water storage space 1a
And a shoulder case 21 connecting upper ends of the outer case 20 and the inner container 1 to each other. The outer case 20 and the shoulder case 21 are each made of synthetic resin. The shoulder case 21 is formed so that its outer peripheral side is continuous with the upper end of the outer case 20 so as to constitute the upper outer body of the container body 18. Above the front side (left side on the paper surface of FIG. 1) of the shoulder case 21, a water injection case portion 21A bulging forward is formed. ing.

The inner container 1 is formed by an inner cylinder 23 and an outer cylinder 24 each made of a stainless steel plate. Inner cylinder 23
Has a cylindrical body portion 23a and a bottom plate portion 23b, and the inside thereof is formed in a bottomed cylindrical shape to be a hot water storage space 1a. At the upper end side of the body portion 23a, a narrowed portion 23c that protrudes in the radial direction is formed, and a slightly full scale 23d that protrudes inward is formed slightly below the narrowed portion 23c. Outer cylinder 24
The upper end of the torso portion 24a is airtightly joined to the upper end of the torso portion 23a of the inner cylinder, so that the closed space 2 is provided between the inner cylinder 23 and the outer cylinder 24.
5 is formed and the vacuum-treated closed space 2 is formed.
5 is a heat insulating layer.

A bottom sensor 26 composed of a thermistor or the like is arranged on the lower surface of the central portion of the bottom plate portion 23b so as to come into contact therewith from below, and detects the temperature of the hot water storage space 1a. Then, the heater unit 27 surrounds the bottom sensor 26.
Is provided. A heat shield plate 28 that covers the bottom of the inner container 1 from below is provided below the heater unit 27, and the electric pump 2 is disposed below the heat shield plate 28.

The electric pump 2 includes a suction pipe 2a provided so as to penetrate the bottom plate 23b, and a discharge pipe 2b connected to the discharge path 3, and the bottom of the inner container 1 and the outer case 2 are provided.
It is arranged in a bottom space 29 between the bottom 20a and the bottom 20a.
An electrical case 30 whose upper surface is covered with a heat shield plate 30a is also installed in the bottom space 29, and houses electrical components such as a microcomputer and a control circuit board. Hot water discharged from the electric pump 2 is discharged from the hot water supply outlet 22 through the discharge path 3 and the water stop valve 31 to the outside.

The lid 19 is formed by integrating an upper plate 33 and a lower plate 34 made of synthetic resin, and can be freely opened and closed and detachable via a hinge mechanism 35 provided on the rear end side of the shoulder case 21. A lock mechanism 36 that is supported by the container body 18 and locks the container body 18 at a closed position that covers the upper opening of the inner container 1 is provided. At a substantially central position of the lid 19, a push plate 37 for constituting a known air supply mechanism E for supplying hot water by a manual push operation is provided so as to be vertically slidable. The air supply mechanism E includes an air-type bellows 38, a steam hole 39, a fluid path (air / steam path) 40, a falling water stop valve 41, and the like, and functions. Reference numeral 5 denotes a lock lever for preventing the push plate 37 from moving downward.

Next, the structure of the lid structure H in the lid 19 will be described in detail. As shown in FIGS.
Is provided with a lid structure H for rationally providing an air supply mechanism E and an example 40 of a fluid path. That is, the lid structure portion H is a lid lower plate portion (first
An example of a structural frame) 42, a plug body made of a synthetic resin (an example of a second structural frame) 43, and a plug inner lid made of a stainless metal plate (third frame)
An example of a structural frame 44 is integrally connected using four screws (an example of a screw member) 4 in a state of being stacked from top to bottom in this order.

As shown in FIG. 3, FIG. 4, and FIG.
The cover lower plate portion 42 belongs to a circular enclosure rib 47 protruding downward over substantially the entire circumference, a central hole 48 for air inflow when the air supply mechanism E is operated, and four screw hole protrusions protruding downward. 49, the passage hole 50 and the first annular packing (an example of the sealing member A) 51 which are recessed upward from the interrupted portion of the surrounding rib 47 and surround the surrounding rib 47 so as to surround the four screw hole projections 49. Inner and outer ring ribs 52a and 52b are formed integrally so as to be freely attached to the inner position.

As shown in FIG. 3, FIG. 5, and FIG.
Reference numeral 3 denotes four co-tightening projections formed to cover the outer and inner peripheral ribs 53 and 54 projecting upward, the steam hole 39, the intermediate path 55 following the steam hole 39, and the tapered boss-shaped screw hole projection 49. An example of the cover portion) 56, four screw holes 76 corresponding to the screw hole projections 49, two escape recesses 57, 57 recessed upward, a concave portion 43 </ b> A for mounting the falling water stop valve 41, a passage hole A guide wall 62 for forming a path to 50, and inner and outer annular ribs 59a and 59b projecting downward so as to allow the second annular packing 58 to be freely attached are integrally formed.

The intermediate path 55 is a flat, substantially horizontal path that is thin vertically and horizontally and connects the outer space of the inner peripheral rib 54 (an outer ring space 70 described later) and the steam hole 39. Reference numeral 60 denotes an auxiliary communication hole which is opened at three places, and reference numeral 61 denotes a downwardly projecting positioning projection formed at two places.

As shown in FIGS. 3, 6, and 7, the sheet metal plug inner lid 44 serving as the lower lid of the lid structure portion H has an outer peripheral wall 44A protruding upward, and corresponds to a screw hole projection 49. It has a screw hole 63 at a location, a downwardly bulging portion 64 which projects downward to accommodate the falling water stop valve 41, and a through hole (an example of a communicating portion according to claim 4) 65a which is recessed upward and has a top portion. A relief recess 65, two positioning holes 66 into which positioning protrusions 61 can be inserted, and two auxiliary holes 67, 67 are formed.

The escape recesses 65 are formed at two locations corresponding to the escape recesses 57, and are provided at the outward end of the outer peripheral wall 44A between the plug inner lid 44 and the lid lower plate 42.
In addition, a seal ring (an example of the seal member B) 68 acting on both between the stopper inner lid 44 and the throttle portion 23c of the inner container 1 can be freely provided. The lower bulging portion 64 is provided with a window (an example of a communicating portion) 64a for air / steam distribution. 1, 3, and 7, a seal ring 68 in a free state is depicted.

The water stop valve 41 is provided in the recess 43 of the plug body 43.
A is formed by a round hole 43a formed in A, a stopper 45 fitted in the concave portion 43A, and a valve weight 46 interposed therebetween. In the posture), the valve weight 46 is placed on the stopper 45, and the round hole 43a is open. The stop basket 45 has a plurality of fan holes 45a for passing a fluid such as steam or water, and these fan holes 45a are open regardless of the position of the valve weight 46.

That is, in the normal posture, the valve weight 46 is placed on the stopper 45 and the round hole 43a is opened, and when the inner container 1 is tilted by more than a predetermined angle (the water heater),
The valve weight 46 moves relatively upward and automatically closes the round hole 43a, so that the hot water in the tank does not run out. Note that the stopper 45 is prevented from coming out of the recess 43A due to the presence of the stopper inner lid 44 attached using the screw 4.

The main function of the fluid path 40 is to release steam when boiling and to introduce air for hot water supply. The path includes a window 64 a of the lower bulging portion 64 and a fan hole 45 of the stop basket 45.
a, a round hole 43a, an upper space portion (an example of an inner space portion) 69 surrounded by a portion inside the inner peripheral rib 54 of the plug body 43 and the lid lower plate portion 42, a steam hole 39, an intermediate path 55, a plug body. An outer peripheral ring space (an example of an outer space portion) 70 sandwiched between the inner peripheral rib 54 and the surrounding rib 47 of 43, a passage hole 50, a passage 71 formed between the upper and lower plates 34 and 34, Board 3
3 is constituted by a steam passage slit 72 formed.

By the way, when tapping is performed by the action of the air supply mechanism E, the push plate 37 is pushed downward, whereby the lower valve 73 is lowered to release the central hole 48 and the steam hole 39 is closed. The bellows 38 is compressed. Thus, the air pushed out by the compression of the bellows 38 is supplied to the inner container 1 through the upper space 69, the water stop valve 41, and the window 64a, and is stored in the inner container 1 by the positive pressure. The hot water is pushed out.

The plug main body 43 and the plug inner lid 44 are assembled to the lid lower plate 42 in a state where they are fastened together with four screws 4 to form the lid structure H, and are in the assembled state. As a result, the maze-state fluid path 40 is formed, and a normal state in which the overturn water stop valve 41 functions is revealed. Since all of the four screw hole projections 49 are arranged inside the first annular packing 51, the outer ring space 7 is formed.
The diameter of the outer peripheral wall 44A of the plug inner lid 44, that is, the diameter of the lid structure portion H can be reduced as compared with the conventional structure in which screws are fixed on the 0 side.

As a result, the inner diameter of the squeezing portion 23c of the inner container 1 can be reduced to a smaller value, so that it is difficult to cool the hot water, the heat retention is more excellent, and the lid case 19 can be made more compact. Have succeeded in getting In addition, in the past, a seal ring for a screw hole had to be provided for each screw. However, in the structure of the present invention in which the screw hole protrusion 49 is located inside the first annular packing 51, the conventional seal ring is unnecessary. The cost can be reduced accordingly.

Since the escape recess 57 is provided in the stopper body 43 and the recess 65 is formed in the stopper inner lid 44 so as to be largely indented upward, for example, the water may accidentally pass through the full scale 23d and reach the position of the stopper inner cover 44. When the hot water boils due to heating when the water is introduced into the plug body 43, the steam generated from the through-hole 65 a is discharged from the through-hole 65 a due to the presence of the high space in the recess 65. Surplus section 7 sandwiched by 44
4. It is possible to escape to the outside through the auxiliary communication hole 60 or the plurality of horizontal holes 75 formed in the horizontal wall portion of the recess 43A. Because of this, due to too much water,
There is an advantage that unexpected hot water blowing from the hot water supply outlet 22 or the steam passage slit 72 can be avoided or suppressed.

Since the periphery of the relatively small diameter screw hole projection 49 projecting largely downward from the lid lower plate portion 42 is covered by the co-tightening protrusion 56 formed on the plug body 43, the co-tightening protrusion 56 is formed. In addition, the screw hole projection 49, which is relatively disadvantageous in terms of heat and strength, is effectively guarded from steam or the like, and has an advantage of functioning as a protective member that contributes to preventing deformation and improving durability.

[Another Embodiment] Lid Structure H According to the Present Invention
Can be applied to any of an electric water heater provided only with an air supply mechanism E for supplying hot water only by manual operation and an electric water heater provided with only the electric pump 2 without the air supply mechanism E.

[0042]

As described above, according to the first aspect of the present invention,
In the lid structure of the electric water heater described in (1), a screw fixing portion for fixing the first structural frame and the second structural frame stacked vertically is formed between the two so as to form a maze-like fluid path. By locating the outside of the loop of the interposed seal member A, the effective entry / exit function of air or steam and the function of delaying hot water spillage at the time of falling down can be stably mounted and the lid structure can be compacted. In addition, the cost was reduced to a reasonable level. Thereby, in order to improve the heat retention, it becomes suitable for a water heater having a structure in which the opening diameter of the upper end portion of the tank is narrowed.

According to the lid structure of the electric water heater according to the second aspect, the effect of the first aspect can be obtained, and
The lid structure can be conveniently mounted and fixed by screw operation from below the lid, so that the screw hole projection projecting downward from the first structural frame can be guarded by the cover of the second structural frame, and the thermal A more rational structure with improved conditions and strength conditions could be realized.

According to the third aspect of the present invention, the lid structure of the electric water heater has any of the above-mentioned effects of the first or second aspect, and the lower side and the lower side of the second structural frame are placed on the lower side. By equipping the covering third structural frame in a jointly tightened state, there is an advantage that it is possible to improve the heat retaining property of the liquid and to reduce the overall height of the lid structure or the water heater.

In the lid structure of the electric water heater according to the fourth aspect, the above-mentioned effect of the third aspect is exhibited, and
In the state where the second structural frame is also depressed and changed, by devising a concave portion with a hole projecting upward largely in the third structural frame, the excessive injection (reservation) of liquid can be performed without adding a dedicated structure or parts. )), It is possible to obtain a functionally superior one that can avoid inconveniences such as boiling blowout and liquid seepage.

According to the lid structure of the electric water heater according to the fifth aspect, the effect of any one of the constitutions of the third and fourth aspects can be obtained, and the third structure can reinforce the fluid path and protect the lid structure. The structural frame can support a seal member B for closing the upper end opening of the tank in an airtight manner, and has an advantage that rationalization can be achieved by using the structural member in common.

[Brief description of the drawings]

FIG. 1 is a side view of a partially cutout showing a schematic structure of an electric pot.

FIG. 2 is a plan view of a lid.

FIG. 3 is a structural view of the lid showing a cross-sectional view as viewed from the front and a left side as a cross-sectional view as viewed from the rear.

FIG. 4 is a bottom view of the lid mainly showing the shapes of a lower plate and a lid lower plate portion (first structural frame).

FIG. 5 is a bottom view of the plug main body (second structural frame).

FIG. 6 is a bottom view of the plug inner lid (third structural frame).

FIG. 7 is a side sectional view showing the structure of the lid.

FIG. 8 is a bottom view showing a screw structure of a conventional lid structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 1a Internal space 4 Screw member 19 Lid 40 Fluid path 42 First structural frame 43 Second structural frame 44 Third structural frame 49 Screw hole protrusion 51 Seal member A 56 Covering portions 64a, 65a Communication portion 65 Recessed portion 68 Seal member B 69 Inner space 70 Outer space 76 Screw hole

Claims (5)

[Claims] 1. A tank capable of storing a liquid, and a lid capable of opening and closing an opening at an upper portion of the tank, and a fluid path for communicating an internal space of the tank with the outside of the water heater is formed in the lid. A lid structure of an electric water heater, wherein: a first structural frame provided at a lower portion of the lid; and a second structural frame stacked on a lower surface side of the first structural frame via a sealing member A. Are integrated by using a plurality of vertically oriented screw members, and an inner space formed inside the seal member between the upper and lower sides of the two structural frames, and the outside of the seal member between the upper and lower sides of the two structural frames. the lid structure for an electric water heater with the outer space constituting the fluid path communicates, the plurality of the screw member, is disposed on the inner side of the seal member to be formed. 2. The screw member is configured to be screwably attached to a screw hole projection protruding from the first structural frame.
A screw hole through which the screw member can be inserted is formed at a position corresponding to the screw hole protrusion in the structural frame, and a cover portion surrounding the screw hole protrusion in a state where both the structural frames are assembled is the second part. The lid structure of the electric water heater according to claim 1, which is provided on a structural frame. 3. A substantially cylindrical shape with a bottom covering the lower side and the lateral side of the second structural frame, and having a communication portion for communicating the fluid path with the internal space of the tank. The third structural frame is configured so as to be mounted on the lower surface side of the second structural frame by the screw member so as to be freely attachable, and the third structural frame is formed in a state where the internal space has a narrowed shape. The lid structure of the electric water heater according to claim 1 or 2, wherein the lid structure is formed to have a size capable of being fitted into an upper end portion of the internal space in the tank. 4. A recessed portion projecting upward from a bottom surface of the third structural frame and having a communicating portion for communicating the fluid path and the internal space of the tank with a top surface thereof. 4. The lid structure for an electric water heater according to claim 3, wherein the lid is formed and a portion corresponding to the recessed portion in the second structural frame is recessed upward. 5. The seal according to claim 3, wherein a seal member B capable of sealing between the third structural frame and an upper end of the tank is provided around the outer periphery of the third structural frame. Lid structure of electric water heater.