JPH0610924Y2 - Electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric water heater such as an electric pot, and more particularly to a structure for mounting a plug receiver on a main body case.

(Prior Art) In a conventional electric water heater, a lower end portion of a cylindrical main body case made of a steel plate is cut out, a plug receiver is inserted into the cutout portion, and the plug receiver and the main body case are combined. A structure has been adopted in which legs of separate parts made of resin are fitted and the legs are pressed by the bottom plate fixed to the main body case to mount the plug receiver.

Further, as described in Japanese Utility Model Publication No. 43-5325, a notch is formed at the lower end of a pot body formed of synthetic resin, and both side edges of the notch are provided on both sides of a plug receiver. A structure is known in which the formed groove is engaged and the plug receiver is fixed by a bottom plate attached to the bottom of the pot body with a screw.

(Problems to be solved by the invention) However, in the electric water heater having the structure in which the above-mentioned conventional leg body is provided separately from the pot body, the plug receiver is not inserted in the notch portion of the body case. Since it was not yet fixed to the main body case, the plug receiver sometimes came off on the assembly line. In addition, a leg body separate from the main body case and the plug receiver is required, and the number of parts is large. Further, the window frame portion of the plug receiver has to be formed outside the main body case made of a steel plate, which causes a problem that the material cost is increased and the assembly is troublesome.

Even in the electric water heater described in Japanese Utility Model Publication No. 43-5325, when the plug receiver is inserted into the cutout portion of the main body case, the plug receiver is not yet fixed to the main body case. There is a problem in that the plug receiver may come off, a bottom plate that is separate from the main body case and the plug receiver is required, and the number of parts increases due to an increase in the number of parts and assembly becomes troublesome.

The present invention has been made in view of the above problems, and the assembly work of the plug receiving portion is simple, the number of parts for attaching the plug receiving portion is small, the structure is simple, the cost is low, and the plug receiving portion is It is intended to provide an electric water heater in which the exterior does not project and the legs of the main body case have a neat appearance.

(Means for Solving the Problems) An electric water heater according to the present invention comprises a container in which water is stored and a heater is arranged in a lower portion, and a substantially cylindrical main body case covering an outer peripheral side of the container. A plug receiver having a contact pin located inward from a peripheral side surface of the main body case and attached to a lower portion thereof and exposed to the outside, and having a terminal electrically connected to the contact pin inside thereof,
The main body case is an integrally molded product of synthetic resin, and the main body case is integrally formed with a leg portion at a peripheral portion of a lower end thereof, and an opening portion is formed above the leg portion and is formed at a lower portion of a peripheral surface. Grooves that are located inside this opening and that protrude upward on both left and right sides and open in opposite directions are integrally formed,
The contact receiving portion facing upward in the vicinity of the opening is integrally formed, and the elastically deformable claw portion facing from the inside is integrally formed in the lower portion of the opening.
Protrusions that extend in the vertical direction on both the left and right sides and are slidably engaged with the grooves of the main body case are integrally formed, and a contact portion that abuts on the contact receiving portion of the main body case from above is integrally formed. At the same time, when the contact receiving portion and the contact portion are in contact with each other, the engaging receiving portion with which the claw portion of the main body case is engaged from above is integrally formed.

(Operation) In the electric water heater of the present invention, when the plug receiver is assembled to the cylindrical main body case made of synthetic resin, the left and right sides of the plug receiver are fitted in the groove portions on the left and right sides of the opening at the lower peripheral surface of the main body case. Insert the ridge by sliding it from above. At this time, the claw part facing the lower part of the opening of the main body case hits the plug receiver and is elastically deformed, and the abutment part of the plug receiver abuts from above on the contact receiving part near the opening of the main body case for insertion. When completed, the claw portion is engaged with the engagement receiving portion of the plug receiver from above. In this state, the ridges on the left and right sides are engaged with the grooves that open in the opposite directions on the left and right sides, so that the plug receiver is locked and fixed in the front-rear and left-right directions with respect to the body case. Since the contact receiving portion contacts the contact portion from below and the claw portion engages with the engaging receiving portion from above, the plug receiver is locked and fixed in the up-down direction with respect to the main body case.

An opening is formed in the lower portion of the peripheral surface of the main body case, which is located above the leg portion integrated with the main body case, and a groove portion which is located inside the lower opening portion and which engages the protrusion of the plug receiver is formed. As a result, the plug receiver does not project outward from the peripheral surface of the main body case, and in combination with the legs forming the legs around the lower end, the appearance is clean and the main body case is The legs have excellent stability.

(Embodiment) Hereinafter, the structure of an embodiment of the electric water heater of the present invention will be described with reference to the drawings.

In FIG. 4, reference numeral 11 denotes a container in which water is stored. The container 11 is formed in a bottomed cylindrical shape having an open upper surface, and has an outlet 12 on the lower surface. And the container
A heater 13 for heating the water in the container 11 is provided on the lower surface of the heater 11.
Is fixed, and, for example, a temperature sensor (not shown) is fixed to the outer peripheral surface portion.

In addition, as shown in FIG.
The mounting bracket 14 is welded, and the second mounting bracket 16 is fixed to the lower side of the first mounting bracket 14 with a screw 15.
The second mounting member 16 has a flange portion 17 on the lower peripheral portion.

Although not shown, a control unit for controlling the heater 13 according to a signal from the temperature sensor or the like is provided below the second mounting member 16.

Next, in FIG. 4, 21 is a substantially cylindrical main body case integrally molded of synthetic resin.
The outer peripheral side of the container 11 is covered. A leg portion 22 is integrally formed on the periphery of the lower end of the body case 21 so as to project.

Further, as shown in FIG. 1, a plurality of projecting pieces 23 projecting inward are formed at a plurality of locations around the lower end of the body case 21. Then, the peripheral portion of the bottom plate 24 that closes the lower surface opening of the main body case 21 is joined to the lower side of the projecting piece 23,
A screw 25 penetrating the bottom plate 24 and the projecting piece 23 is screwed to the flange portion 17 of the second mounting member 16 joined on the projecting piece 23, so that the main body case 21 and the container 11 are fixed at the lower part. ing.

A plug receiver 26 is attached to the rear side of the lower portion of the peripheral surface of the body case 21.

Further, as shown in FIG. 4, a spout cover 31 is attached to the upper front side of the main body case 21. Then, from the outlet 12 of the container 11 in the main body case 21 to the spout cover
An outflow passage 32 is formed inside 31. The portion of the outflow passage 32 covered by the spout cover 31 is a spout 33 to the outside that opens downward. Further, a receiving stand 34 is attached on the main body case 21 and the spout cover 31, and the upper portion of the container 11 is supported by the receiving stand 34.

Further, a lid 35 is provided on the upper side of the pedestal 34 so as to be rotatable and openable. A push button 36 for allowing the water in the container 11 to flow out from the pouring port 33 is provided on the top of the lid 35. That is, this push button 36
Is linked to a pneumatic pump or an electric pump (not shown).

Next, a mounting structure of the body case 21 and the plug receiver 26 will be described with reference to FIGS. 1 to 3.

On the rear side of the lower part of the peripheral surface of the main body case 21, an opening portion 41 that is located above the leg portion 22 and opens inward is formed. The lower edge portion of the opening portion 41 connected to the leg portion 22 is offset forward from the upper edge portion of the opening portion 41 by at least the thickness thereof so as not to be undercut during molding.

Further, a convex portion 42 as a contact receiving portion extending in the left-right direction is formed inside the upper edge portion of the opening 41, and a step portion serving as a contact receiving portion extending in the left-right direction is formed inside the lower edge portion. 43 is formed. In addition, a pair of parallel side walls 44 are integrally formed by bending inward from the left and right side edges of the opening 41. These side walls 44 are also integrally connected to the bottom surface inside the main body case 21. Grooves 45 that extend in the up-down direction and open in opposite directions are formed in the both side walls 44, respectively. These groove portions 45 are pulled out upward, but are not pulled out downward. Further, on both side walls 44, a convex portion 46 that is located in front of the groove portion 45 and that extends in the vertical direction and protrudes in the opposite direction is formed.

Further, an elastically deformable claw portion 47 is formed integrally with the bottom surface of the main body case 21 so as to project upward and to face the lower portion of the opening 41 from the inside, that is, the front.
Further, on the upper part of the claw portion 47, a locking claw 48 having a side surface shape of a right-angled triangle having a hypotenuse on the upper side is formed so as to project rearward. In addition, below this locking claw 48, this locking claw 48
A through hole 49 is formed so as not to undercut during molding. Further, a rib 50 as a contact receiving portion is formed so as to project on the inner bottom surface of the main body case 21 located behind the through hole 49.

On the other hand, the plug receiver 26 is substantially U-shaped in a side view by the front plate portion 56 integrally formed of synthetic resin, the upper plate portion 57 also serving as the contact portion, and the lower plate portion 58. A pair of contact pins 59 are pierced in the front-rear direction on both left and right sides of the front plate portion 56 and fixed by nuts 60.

It should be noted that a groove portion 45 that is bent inward from both left and right side edge portions of the opening portion 41 and opens in a direction opposite to a pair of parallel side walls 44.
Since these contact pins 59 have a length for plug connection, when the plug receiver 26 is assembled to the main body case 21, the contact pins 59 are outward from the peripheral side surface of the main body case 21. It is located inward of the peripheral side surface of the main body case 21 so as not to project inward.

Further, on the left and right sides of the front surface of the front plate portion 56, the upper portions of a pair of plate-shaped terminals 61 which are substantially L-shaped in side view are fixed by the nuts 60. That is, the pair of contact pins 59 and the terminal 61 are electrically connected to each other. A lead wire 62 is connected to the lower portion of each of the terminals 61 with a screw 63, and is electrically connected to the control unit or the heater 13 via the lead wire 62. Further, an iron plate 64 is attached to the central portion of the rear surface of the front plate portion 56.

Further, on the lower side of the rear edge of the upper plate portion 57 of the plug receiver 26,
A step portion 66 is formed as an abutting portion to be fitted into the convex portion 42 of the main body case 21. Further, on the rear side of the lower surface of the lower plate portion 58, there is formed a protrusion 67 which projects downward and is joined to the front side of the lower edge portion of the opening 41 of the main body case 21. Further, the left and right side edges of the front plate portion 56 respectively extend in the vertical direction and are slidably fitted into the groove portion 45 of the main body case 21.
It is 68. Although not shown, these ridges
The upper end of 68 is connected to the upper plate portion 57. On the other hand, these protrusions 68 project from the lower plate portion 58. Further, on the left and right sides of the front surface of the front plate portion 56, there are formed protrusions 69 extending in the up-down direction, which also serve to position the terminals 61 and are engaged with the protrusions 46 of the body case 21. Further, when the lower plate portion 58 or the like comes into contact with the step portion 43 and the rib 50 of the main body case 21 or the like from above on the lower front surface of the front plate portion 56, the locking claw 48 is engaged from above. Rib-shaped engagement receiving portion 70
Are formed integrally by projecting forward.

Further, although not shown, the opening of the main body case 21
The plug inserted into 41 and detachably connected to the plug receiver 26 has a through hole into which the contact pin 59 is inserted, and a pin receiver into which these contact pins 59 come into contact. The pin receivers are electrically connected to an external AC power source via a power cord. Further, a magnet attracted to the iron plate 64 of the plug receiver 26 is fixed to this plug.

Next, the operation of this embodiment will be described.

When assembling the plug receiver 26 to the main body case 21,
In the main body case 21, the protrusions 68 on both the left and right sides of the plug receiver 26 are slid from above and inserted into the groove portions 45 on both the left and right sides. At this time, the convex portion 69 of the plug receiver 26 also slides along the front side of the convex portion 46 of the main body case 21. In this way ridges 68
When the plug receiver 26 is pushed into the groove 45, the lower surface of the plug receiver 26 hits the upper side of the locking claw 48 of the claw portion 47 of the main body case 21. By doing so, the claw portion 47 is elastically deformed forward by being pushed by the plug receiver 26, and the lower surface of the plug receiver 26 crosses over the locking claw 48. The lower plate portion 58 of the plug receiver 26 contacts the rib 50 and the step portion 43 of the main body case 21 from above, and the upper plate portion 57 and the step portion 66 of the plug receiver 26 serve as the contact receiving portion of the main body case 21. The upper surface 44a of the side wall 44 and the protrusion 4
When the contact is made from above with 2 and the insertion is completed, the locking claw 48 of the claw portion 47 is engaged with the shelf-shaped engagement receiving portion 70 of the plug receiver 26 from above. Also, the protrusion 67 of the plug receiver 26 is the main body case
It is joined to the lower edge of the opening 41 of 21 from the front.

In this state, the protrusions 68 on both the left and right sides of the plug receiver 26 are provided in the groove portions 45 on both the left and right sides that are opened in opposite directions of the main body case 21.
Since the plugs are fitted to each other, the plug receiver 26 is locked and fixed to the main body case 21 in the front-rear direction and the left-right direction. Further, the rib 50 of the main body case 21, the step portion 43, the upper surface 44a of the side wall 44 and the convex portion 42 are in contact with the lower plate portion 58 and the upper plate portion 57 of the plug receiver 26 from below, and the main body case 21
Since the locking claw 48 of the claw portion 47 is engaged with the engagement receiving portion 70 of the plug receiver 26 from above, the plug receiver 26 is locked and fixed to the main body case 21 in the vertical direction. Further, the convex portion 42, the step portion 43, the lower edge portion and the convex portion 46 of the opening portion 41 on the main body case 21 side, the step portion 66 on the plug receiving 26 side, the lower edge portion of the lower plate portion 58, the protrusion 67 and the convex portion. 69 case fits in the body case 21
The movement of the plug receiver 26 in the front-rear direction and the left-right direction is more reliably regulated.

Further, wiring work is performed, the bottom plate 24 is attached to the lower surface opening of the main body case 21, and the lower portion of the container 11 is fixed to the main body case 21.

According to the above configuration, unlike the conventional structure, the plug receiver is not sandwiched between the main body case and the separate leg or bottom plate, so the number of parts for attaching the plug receiver is reduced, and the structure is simplified. , The assemblability is improved and the cost can be reduced.

Moreover, the plug receiver 26 can be attached to the main body case 21 by a simple operation of inserting the protrusions 68 and the groove portions 45 as guides.

Further, since the shape of the plug receiver 26 can be made substantially flat and a box-shaped frame portion need not be formed unlike the conventional case, the material usage fee can be reduced and the material cost can be reduced accordingly.

Further, as shown in FIG. 1 and FIG. 2, since the plug receiver 26 including the contact pins 59 does not project outward from the outer surface of the main body case 21, the appearance as a whole can be made into a flash surface, and in terms of design. It can be neat. That is, the flash surface design can be supported.

In addition, after the plug holder 26 is assembled to the body case 21, the plug holder 26 is securely coupled and fixed to the body case 21.
Will not come off and workability will be improved.

Further, as the completed assembly, as shown in the drawing, the entire plug receiver 26 is located inside the main body case 21, so that when the plug is connected to the plug receiver 26, the plug receiver 26 is completely hidden. Therefore, in the conventional electric water heater in which the plug receiver is exposed on the outer surface of the main body case, it is necessary to use a color material of the same color as the main body case for the plug receiver. While it was a plug receiver, in this electric water heater,
Regardless of the color of the body case 21, the plug receiver 26 can be made of a cheap material of one color, such as black phenol resin. That is, the plug receiver 26 made of an inexpensive material can be used for all models, and cost reduction and standardization of parts can be achieved.

(Effects of the Invention) According to the present invention, the main body case made of synthetic resin is formed with an opening, and on the left and right sides of the inside of the opening, a groove is formed that extends upward and faces each other. The contact receiving portion facing upward is formed, and the claw portion facing from the inside is formed in the opening portion, while the plug receiving portion is formed with protrusions slidably engaged with the groove portions on both left and right sides, Since the contact receiving portion is formed to contact the contact receiving portion from above and the claw portion elastically engages from above, the number of parts for fixing the plug receiving portion is increased. The number of plug receivers can be reduced, the structure can be simplified, the cost can be reduced, and the plug receiver can be easily attached to the main body case simply by inserting it, and it can be securely fixed to the main body case. But once you get the plug After assembly, this plug receiver will not come off from the main body case, improving workability. Further, since the groove portions are formed so as to face each other on the left and right sides inside the opening of the main body case, the plug receiver is located inside the opening and does not project outward from the peripheral surface of the main body case. The legs that are integrated with the main body case allow for a neat appearance design.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a plug receiving portion of an electric water heater showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1 of the same as above, and FIG. The view and FIG. 4 are side views of the same as above. 11 …… container, 13 …… heater, 21 …… body case, 22 ……
Legs, 26 ... Plug receivers, 41 ... Openings, 42 ... Convex parts as contact receiving parts, 43 ... Step parts as contact receiving parts, 44a ...
... Upper surface of side wall as contact receiving portion, 45 ... Groove portion, 47 ... Claw portion, 50 ... Rib as contact receiving portion, 57 ... Upper plate portion as contact portion, 58 ... As contact portion Lower plate part, 59 ... contact pin, 61 ... terminal, 66 ... step part as abutting part, 68 ... ridge, 70 ... engagement receiving part.

Claims (1)

[Scope of utility model registration request] 1. A container in which water is stored and a heater is disposed in a lower portion, a substantially cylindrical main body case covering the outer peripheral side of the container, and a position inside the peripheral side surface of the main body case. And a plug receiver having a contact pin attached to the lower part thereof and exposed to the outside and having a terminal electrically connected to the contact pin on the inside, the main body case is formed as an integrally molded product of synthetic resin. In this main body case, legs are integrally formed around the lower end and an opening is formed above the legs at the lower part of the peripheral surface. Grooves that open upward and open in opposite directions are integrally formed,
The contact receiving portion facing upward in the vicinity of the opening is integrally formed, and the elastically deformable claw portion facing from the inside is integrally formed in the lower portion of the opening. Protrusions that extend in the vertical direction and are slidably engaged with the groove portions of the main body case are integrally formed, and a contact portion that abuts on the contact receiving portion of the main body case from above is integrally formed. An electric water heater characterized in that an engagement receiving portion is integrally formed with which the claw portion of the main body case is engaged from above when the contact receiving portion and the contact portion are brought into contact with each other.