JPH06335422A - Waterproof mechanism for electric water heater - Google Patents

Abstract

PURPOSE:To provide a waterproof mechanism of an electric water heater to prevent a leak to the control circuit board. CONSTITUTION:A storing part 21 opening downward provided with a waterproof lib 23 on the periphery and a lid part 31 provided with an inside periphery lib and an outside periphery lib near the periphery are fitted by fitting the click part of the storing part 21, and the engaging part 36 of the lid part 31 and the waterproof lib 23 are watertighly put in between the outside Jib and the inside lib. Thus, deposit of water drop on the control circuit board in the storing part 21 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for an electric water heater, which is mainly used in homes and offices.

[0002]

2. Description of the Related Art Conventionally, an electric water heater of this type has been shown in FIG. 4, for example. (1) is a cylindrical body,
(2) is a container for containing a liquid contained in the body (1), (3) is a heating element provided at the bottom of the container (2), and (4) is formed by molding with synthetic resin or the like. And (5) is a storage section that opens downward, and a control board (6) that forms an electric circuit is arranged in the storage section (5) so that each element is positioned downward. It is arranged horizontally. An upper frame (8) provided on the upper part of the body (1) with a locking portion (7) provided outside the periphery of the upper end opening of the container (2) and having a substantially circumferential opening in the center. ) Is housed by being locked in the circumferential stepped portion (9), and a bottom plate (4) for supporting the body (1) is provided with a back plate (10).
0) and a fitting (11) fixedly provided on the bottom of the container (2) are fastened with a set screw (12), whereby the back plate (10) pulls the container (2),
The container (2) pulls the body (1) toward the base (4) through the upper frame (8). Therefore, the body (1)
Will be assembled in a state of being sandwiched between the upper frame (8) and the base (4). Reference numeral (13) is a lid which is attached to one end of the upper frame (8) so as to be openable and closable and covers the upper end opening of the container (2). (14) is a hot water supply pump, one end of which communicates with the vicinity of the bottom of the container (2) and the other end of which communicates with a discharge port (16) through a water pipe (15) and is open to the outside. . The control board (6) receives a signal from a temperature detecting element (17) which is heat-sensitively provided in the lower center of the bottom of the container (2) and detects the boiling state of the heating element (3) to detect the heating state. The power supply to (3) is controlled, and after the completion of boiling, the heat retention state is controlled to continue to maintain the function of the electric water heater. (18) is an operation plate, and a switch (1
9) is provided and input to the control board (6).
Reference numeral (20) is a hot water supply knob for operating the hot water supply pump (14). When turned to the right, hot water is supplied to the hot water supply knob.
0) automatically returns.

In this structure, when water is put in the container (2) and electricity is applied, the container is boiled and the temperature detecting element (17) detects the boiling, and the control board (6) maintains and controls the heat retention state. In the heat-retaining state, the control board (6) controls the energization to the heating element (3) while detecting the temperature in the container (2) through the temperature detection element (17), and the hot water in the container (2) is controlled. Keep the temperature constant. Further, when it is desired to boil the water while keeping it warm, when the switch (19) is pressed through the operation plate (18) and operated, the control board (6) energizes the heating element (3) and the water in the container (2) boils. . Eventually, the temperature sensing element (1
7) detects the water temperature through the container (2), and the heating element (3)
Stop energizing to. When hot water is desired, turn the hot water supply knob (20). When the hot water supply knob (20) is turned, the hot water supply pump (14) is operated and the hot water in the container (2) is discharged from the discharge port (16) through the water guide pipe (15). When the desired hot water is obtained, the hot water supply knob (20) is released. The hot water supply knob (20) automatically returns to stop hot water supply.

[0004]

However, in the conventional structure as described above, since the control board (6) is located below the container (2), water is flooded during cleaning and maintenance. Then, there was a problem that water droplets adhered to the control board (6) and malfunctioned. SUMMARY OF THE INVENTION The first object of the present invention is to provide a waterproof structure for an electric water heater that prevents water from entering the control board. A second object is to provide a waterproof structure in which the water to be flooded is waterproofed by the inner ribs. Thirdly, it is an object of the present invention to provide a waterproof structure with improved repairability by facilitating removal of the lid. A fourth object is to provide a waterproof structure for preventing water from entering from the inlet / outlet of an electric wire for electrically connecting the control board to the heating element.

[0005]

In order to achieve this first object, a substantially cylindrical body, a bottomed container housed inside the body, and a bottomed container are provided. A heating element that heats the liquid contained in the container, a control board that constitutes an electric circuit located below the container, and a storage opening that opens downward to accommodate and fix the control board and a waterproof rib extends around the outer circumference. Part, and an outer peripheral rib and an inner peripheral rib for watertightly sandwiching the waterproof rib around the outer periphery, and the storage portion is substantially closed by sandwiching the waterproof rib from below from the outer peripheral rib and the inner peripheral rib. It is composed of a lid part. Further, in order to achieve the second object, the inner peripheral rib is made longer than the outer peripheral rib. Further, in order to achieve the third object, the claw portion is extended toward the outer periphery of the storage portion in the direction of the lid portion, and the lid portion is provided with a locking portion for locking the claw portion. Is. Furthermore, in order to achieve the fourth objective,
A limiting rib extending toward the lid portion on a part of the outer periphery of the storage portion, an inner rib inside the limiting rib and an outer rib extending outward from the lid portion, and the limiting rib of the storage portion. The control board and the heating element are connected by an electric wire held between the inner rib and the outer rib of the lid.

[0006]

The present invention can provide a waterproof structure for an electric water heater that prevents water from entering the electric circuit by the above-mentioned first means. Further, the second means can provide the waterproof structure of the electric water heater in which the water to be flooded can be waterproofed by the inner rib. Furthermore, the third means makes it possible to easily remove the lid portion and provide a highly repairable waterproof structure for an electric water heater. Further, by the fourth means, it is possible to provide a waterproof structure of the electric water heater capable of preventing water from entering from the entrance of the electric wire.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the body (1), the container (2), the heating element (3), the base (4), the control board (6), the locking portion (7), the upper frame (8), and the circumferential step. (9), back plate (10), mounting bracket (11), set screw (12), lid (13), hot water supply pump (14), water pipe (15), discharge port (16), temperature detecting element (1)
7), the operation plate (18), the switch (19), and the hot water supply knob (20) have the same functions and have the same numbers as in the conventional embodiment. Reference numeral (21) is a storage portion for storing each element of the control board (6) so as to be located below, and the mounting metal fitting (1
A fixed part (22) which is fixed by being sandwiched between 1) and the base (4).
And a waterproof rib (2
3) is extended, and the flange portion (24) is extended outward from the root of the waterproof rib (23). 2 of the waterproof ribs (23)
An electric wire (25) for electrically connecting the control board (6) to the heating element (3) and the operation section (18) by cutting out a portion.
There is provided a passage portion (26) for passing the. Passage (2
6) is provided with a limiting wall (27) on both sides, and a limiting rib (28) is provided so as to extend across the passage portion (26). In addition, two pairs of claws (2) are provided at positions facing the flange (24) of the storage (21) in the waterproof rib (23) direction.
9) is extended and a locking claw (30) is provided on the outside.
Reference numeral (31) is a lid portion, and an outer peripheral rib (32) is extended to the outermost periphery and an outer peripheral rib (3) is provided inside the outer peripheral rib (32).
2) An inner peripheral rib (33) higher than the outer peripheral rib (32) is provided by providing a waterproof rib (23) of the storage portion (21).
While being sandwiched between the inner peripheral rib (33) and the inner peripheral rib (33), it is closed from the lower side to obtain watertightness, and in fitting with the passage portion (26), about 2 mm from the limiting rib (28) with respect to the limiting rib (28). Inner ribs (3 located inside the storage part (21)
4) and an outer rib (35) located outside the storage part (21) by about 2 mm from the limiting rib (28), the tip of the limiting rib (28), the inner rib (34) and the outer side. Rib (3
The tips of 5) are in a positional relationship where they interfere with each other. (3
Reference numeral 6) is an engaging portion that fits into the claw portion (29) of the storage portion (21), and the locking claw (30) is locked to the lid portion (31).
And the storage part (21) is fixed in a watertight manner. At this time, the electric wire (25) for electrically connecting the control board (6) and the heating element (3) is pushed from above by the limiting rib (28) of the accommodating part (21) in the passage part (26) to cover the lid. The inner rib (34) and the outer rib (35) of the portion (31) are pressed from below to bend in a substantially inverted V shape, and the limiting rib (28), the inner rib (34), and the outer rib. By making contact with (35), it is possible to form a structure that prevents water droplets from penetrating through the electric wire (25).

In the above construction, the basic operation is the same as that of the conventional example, and will be omitted. When pouring water into the container (2) or when cleaning the body (1), water may infiltrate into the body (1) through a slight gap due to its structure. At this time, water droplets do not directly adhere to the control board (6) because of the lid portion (31), but the lid portion (3
The outer peripheral rib (32) of 1) and the flange portion (24) of the accommodating portion (21) try to infiltrate water, but the inner peripheral rib (33) of the lid portion (31) is higher than the outer peripheral rib (32), so Cannot ride over the inner rib (33). Therefore,
There is no water in the storage part (21). Further, when the main body is inverted by cleaning or the like, if water is attempted to enter from the outer peripheral rib (32) of the lid portion (31) and the flange portion (24) of the storage portion (21), the waterproof rib (of the storage portion (21) ( Since 23) is higher than the flange portion (24), water cannot get over the waterproof ribs (23). Therefore, the storage part (21) is not flooded. Further, an electric wire (25) for electrically connecting the control board (6) and the heating element (3) is pushed into the passage portion (26) from above by the limiting rib (28) of the storage portion (21), so that the lid portion. The inner ribs (34) and the outer ribs (35) of (31) are pushed from below to bend in a substantially inverted V shape, and the limiting ribs (28), the inner ribs (34), and the outer ribs (34). 35), when contacting with the upper part of the electric wire (25) and trying to infiltrate, it is repelled by the limiting rib (28) of the storage part (21) and covers the lower part of the electric wire (25) to infiltrate. It is repelled by the outer ribs (35) of the portion (31), and even if it goes over the outer ribs (35), it will be repelled by the higher inner ribs (34) and at the passage portion (26). It is possible to prevent the infiltration of water droplets that travel along the electric wire (25). Even if water is transmitted along the side surface of the electric wire (25), the tips of the limiting ribs (28) and the tips of the inner ribs (34) and the outer ribs (35) interfere with each other, so that the water droplets form the outer ribs. (35), the limiting ribs (28), and the inner ribs (34) are attracted by the surface tension, so that water is prevented from entering the storage portion (21). Therefore, the storage part (21) is not flooded. Further, when disassembling for repair or the like, generally, the main body is turned over to remove the back plate (10), the base (4) is removed, and then the lid portion (31) is removed.
At this time, as shown in FIG. 3, when the tips of the facing claws (29) of the storage section (21) are sandwiched by fingers, the claws (29) bend and the locking claws (30) engage the engaging sections (36). ) Disengage from the claw (29)
The engagement between the engaging part (36) and the engaging part (36) is released, and the fixing between the storage part (21) and the lid part (31) is released. Since the fixing of the lid portion (31) and the storage portion (21) can be released only by sandwiching the opposing claw portions (29) with the fingers at two places, simple repairability can be obtained.

[0009]

As is apparent from the description of the above embodiments, the waterproof structure of the electric water heater of the present invention has a substantially cylindrical body, a bottomed container housed inside the body, and a container of the container. A heating element disposed at the bottom for heating the liquid contained in the container, a control board constituting an electric circuit located below the container, a downward opening for housing and fixing the control board, and a waterproof rib around the outer periphery And an outer peripheral rib and an inner peripheral rib for watertightly sandwiching the waterproof rib around the outer periphery of the accommodating portion, and the outer peripheral rib and the inner peripheral rib sandwiching the waterproof rib from the lower side of the accommodating portion. Since it is configured with a lid portion that substantially closes, it is possible to prevent water from entering the electric circuit.

Further, according to the present invention, by making the inner peripheral rib longer than the outer peripheral rib, water to be flooded can be waterproofed by the inner rib. Further, according to the present invention, the claw portion is extended in the direction of the lid portion so as to face the outer periphery of the storage portion, and the lid portion is provided with the locking portion for locking the claw portion, whereby the lid portion can be removed. The waterproof structure of the electric water heater can be easily performed and has high repairability.

Further, according to the present invention, a limiting rib extending toward the lid portion on a part of the outer circumference of the storage portion, an inward rib inside the limiting rib and an outward rib outwardly extending from the lid portion. , A water drop which is transmitted through the electric wire and is intended to be infiltrated by the structure in which the control board and the heating element are connected by the electric wire sandwiched between the limiting rib of the storage section, the inner rib of the lid section and the outer rib of the lid section. Can be repelled by the limiting ribs and the inner and outer ribs.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a waterproof structure of an electric water heater showing an embodiment of the present invention.

FIG. 2 is a partial sectional view of a waterproof structure of an electric water heater showing an embodiment of the present invention.

FIG. 3 is a partial sectional view of a waterproof structure of an electric water heater showing an embodiment of the present invention.

FIG. 4 is a sectional view of a conventional electric water heater.

[Explanation of symbols]

 1 Body 2 Container 3 Heating Element 6 Control Board 21 Storage Section 23 Waterproof Rib 31 Lid 32 Outer Rib 33 Inner Rib

Claims (4)

[Claims] 1. A substantially cylindrical body, a bottomed container housed inside the body, a heating element arranged at the bottom of the container for heating a liquid contained in the container, A control board that constitutes an electric circuit located below the container, a storage section that opens and holds a waterproof rib on the outer periphery of the control board, and a watertight sandwich of the waterproof rib on the outer periphery. A waterproof device for an electric water heater, comprising: an outer peripheral rib and an inner peripheral rib extending from the lower portion of the housing, and the outer peripheral rib and the inner peripheral rib sandwiching the waterproof rib from the lower side to substantially close the waterproof rib. 2. The inner peripheral rib is longer than the outer peripheral rib.
Waterproof device for the electric water heater described. 3. A waterproofing apparatus for an electric water heater according to claim 1, wherein a claw portion is extended toward the outer periphery of the storage portion in the direction of the lid portion, and a locking portion for locking the claw portion is provided on the lid portion. 4. A limiting rib extending in the direction of the lid portion on a part of the outer periphery of the storage portion, an inner rib inside the limiting rib and an outer rib extending outwardly from the lid portion, and the storage rib is provided. 2. The waterproof device for an electric water heater according to claim 1, wherein the control board and the heating element are connected by an electric wire sandwiched between the limiting rib of the section and the inner rib and the outer rib of the lid section.