JPH06105745A - Electric water boiling apparatus - Google Patents

Abstract

PURPOSE:To prevent malfunction due to attachment of the water, which has intruded into the body of an electric water boiling apparatus, to a control circuit by furnishing a waterproof cover to block the opening of a holder which covers water-tightly the over-part and side faces of the control circuit. CONSTITUTION:The water which has intruded from a gap in the body of an electric water boiling apparatus at the time of water supply or washing and is willing to attach to a control board 5 upon splashing when the body is moved and carried, is hindered by a waterproof cover 30 and does not reach the control board 5. Also because the water willing to intrude from the fit part of an accommodation part (holder) 20 with the cover 30, can not get over a rib 32 installed extending from the cover 30, it can not get into the space bounded by the accommodation part 20 and cover 30. If the body is inverted up and down, on the contrary, the water willing to intrude from the fit part of the accommodation part 20 with the cover 30 is trapped in a groove 29 formed in the accommodation part 20 and can not stride over a groove 29, so that it does not enter the space bounded by the accommodation part 20 and cover 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater mainly used in homes and offices.

[0002]

2. Description of the Related Art Conventionally, this kind of electric water heater has been shown in FIG. 5, for example. (1) is a cylindrical body,
(2) is a container for accommodating the liquid contained in the body (1), (3) is a heating element provided at the bottom of the container (2), and (4) is located below the container (2). It was a base with an open side, and was equipped with a control board (5) that forms a control circuit in the space inside the base (4), and the upper and side sides of the control board (5) were covered with a holder (6). A central opening (9) of an upper frame (8), which is disposed on the upper part of the body (1) and has an opening in the center, is provided with a locking portion (7) provided outside the upper edge of the container (2). ), The back plate (10) is provided at the bottom of the base (4) for supporting the body (1), and the back plate (10) and the bottom of the container (2) are provided. The back plate (10) pulls the container (2) by fastening the fixing metal fitting (11) fixedly provided with the fixing screw (12), and the container (2) passes through the upper frame (8). Body (1)
Will be pulled toward the base (4). Therefore, the body (1) is assembled while 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). Reference numeral (14) is a water pipe, one end of which communicates with the vicinity of the bottom of the container (2) and the other end of which communicates with the discharge port (15) and is open to the outside. The control board (5) receives a signal from a temperature detecting element (16) which is provided under the center of the bottom of the container (2) and is heat-sensitive, and detects the state of boiling water by the heating element (3) to detect the heating element. (3)
The electric power to the electric water heater is controlled, and after the completion of the water heating, the heat retention state is controlled to keep the function of the electric water heater.

The lid (13) has a bellows-shaped air pump (17) built therein, and a push plate (18) provided on the upper part of the air pump (17) and one end of the lid (13) on the upper part inside the container (2). A steam passage (19) having an opening and the other end opening outward.

In this structure, when water is put into the container (2) and electricity is applied, the container is boiled and the temperature detecting element (16) detects the boiling, and the control board (5) maintains and controls the heat retention state. The steam generated at the time of boiling is steam passage (1
It passes through 9) and is discharged outward. In the heat retaining state, the control board (5) is connected to the container (2) via the temperature detecting element (16).
The temperature of the hot water in the container (2) is kept constant by controlling the energization of the heating element (3) while detecting the temperature inside. When hot water is desired, push plate (18) is pressed. When the push plate (18) is pushed, the air in the air pump (17) is pressure-fed above the container (2) to push down the water surface, and the hot water in the container (2) passes through the water pipe (14) and the discharge port (15). ) Is released by. The push plate (18) will be repeatedly pressed until the desired hot water is obtained.

[0005]

However, in the conventional structure as described above, since the control board (5) is housed in the holder having an opening at the lower side, it penetrates from the gap of the main body at the time of water supply or cleaning. There is a problem that when the main body is moved or carried, water splashes, adheres to the control board (5), short-circuits an electric circuit, and causes the control board (5) to malfunction.

The present invention solves the above-mentioned conventional problems, and it is a first object of the present invention to prevent water that has entered the main body from adhering to the control circuit and malfunctioning.

A second object is to provide an economical electric water heater by integrating the holder and the base.

Thirdly, even if a gap is generated between the holder and the waterproof cover due to processing, etc., the waterproof effect can be maintained by the fitting structure of the groove of the holder and the rib of the waterproof cover. There is.

Fourthly, a double rib structure in which the outer peripheral rib is high and the inner peripheral rib is low is extended to almost the outer periphery of the waterproof cover, and a gap is formed between the holder and the waterproof cover due to processing reasons. The purpose is to maintain the waterproof effect even if it occurs.

A fifth object of the present invention is to make the structure simple by omitting the fixing structure of the waterproof cover by pressing and fixing the holder with the back plate.

A sixth object is to prevent the generation of a gap between the fitting portion of the holder and the waterproof cover by extending the elastic biasing claw downward from the waterproof cover and pressing it with the back plate. I am trying.

In the seventh aspect, an operating portion is provided on a side wall of the base, and a part of the side wall including the operating portion, an upper surface, a side surface, and a partially opened bottom surface are integrally formed as an accommodating portion. Then, the opening of the storage section is closed with a waterproof cover, and the storage section has a built-in control circuit having a switch operated by the operation section or a display member whose display can be confirmed from the operation section. An object of the present invention is to provide a highly reliable and economical electric water heater capable of improving watertightness and further simplifying the configuration.

[0013]

In order to achieve the first object, a cylindrical body, a bottomed container housed in the body, and a container provided at the bottom of the container are provided in the container. A heating element for heating the contained liquid, a base mounted on the lower part of the body, a back plate for closing the lower part of the base, a control circuit below the container and included in the base, The holder comprises a holder that covers the upper and side surfaces of the control circuit in a watertight manner and has a lower opening, and a waterproof cover that substantially closes the opening of the holder.

Further, in order to achieve the second object, the holder and the base are integrally formed.

Further, in order to achieve the third object, a groove portion is provided on substantially the outer circumference of the holder, a rib is extended on the substantially outer circumference of the waterproof cover, and the rib is fitted in the groove portion. is there.

In order to achieve the fourth object, the ribs of the waterproof cover are composed of outer peripheral ribs and inner peripheral ribs, and the inner peripheral ribs are formed lower than the outer peripheral ribs.

Further, in order to achieve the fifth object, the holder is pressed and fixed by the back plate.

In order to achieve the sixth object, elastic biasing claws are extended downward on the waterproof cover and pressed by the back plate.

Further, in order to achieve the seventh object, an operating portion is provided on the side wall of the base, and the side wall including the operating portion is accommodated inside the base with a bottom surface having a top surface, a side surface and a part opened. Part is integrally formed, the opening of the storage part is closed with a waterproof cover, and a control circuit having a switch operated by the operation part or a display member whose display can be confirmed from the operation part is built in the storage part. The configuration is as follows.

[0020]

With the first means described above, the present invention can prevent water that has entered the main body from adhering to the control circuit and malfunctioning, and can provide a highly reliable electric water heater.

Further, since the base and the holder are integrally formed by the second means, the processing cost of the holder and the base can be reduced, and an electric water heater with good assembling can be formed.

Further, by the third means, the watertightness can be maintained even if the processing accuracy of the holder and the waterproof cover is somewhat poor, and a highly reliable electric water heater can be provided. Further, by the fourth means, the watertightness can be maintained by the inner peripheral ribs even if the invaded water gets over the outer peripheral ribs, and a highly reliable electric water heater can be provided.

Further, since the holder can be fixed to the back plate by the fifth means, the fixing structure of the waterproof cover can be omitted and an economical electric water heater can be provided with a simple structure.

Further, by the sixth means, even if a gap is to be formed between the fitting portion of the holder and the waterproof cover, the back plate is forcibly pressed to prevent the formation of the gap and maintain the watertightness. It is possible to provide a highly reliable electric water heater.

Further, by the seventh means, the accommodating portion is watertight except for a part of the bottom portion, and the watertightness of the opening is also improved by the waterproof cover, so that the structure can be further simplified, and the height can be improved. A reliable and economical electric water heater can be provided.

[0026]

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 (5), the locking portion (7), the upper frame (8), the opening (9). ), Back plate (10), mounting bracket (11), fixing screw (12), lid (13), water pipe (14), discharge port (15), temperature detecting element (16), air pump (1)
7), the push plate (18) and the steam passage (19) have the same functions and have the same numbers as in the conventional embodiment. Reference numeral (20) denotes a top surface (21), a side surface (22), a bottom surface (23) having a part near the center opened inside the base (4), and a side wall () of the base (4). 24) is a storage portion that is formed integrally with the base (4) by being formed with an operation portion (25) that is formed as a part of the storage portion, and that forms a holder for storing and fixing the control board (5). In terms of processing, it is molded by injection molding, and the mold is split above and below the base (4) to slide the inner top surface (21), side surface (22), and bottom surface (23) of the storage part (20). It will be molded as a mold configuration. Therefore, in the structure of the storage section (20), it is necessary to open a part of the bottom surface (23) as a slide type relief section. The operation section (2
5), a through hole (28) is provided in a portion located in front of the light emitting diode (26) and the operation switch (27) constituting the display member soldered on the control board (5). . (29) is a side surface (2) of the storage section (20)
The groove (30) is formed downward along 2), and (30) is formed of an elastic material such as a synthetic resin that substantially closes the opening (31) as the slide type escape portion from below. It is a waterproof cover, and a rib (32) fitted to the groove (29) is extended on the outer periphery and a base (4) is provided.
An elastic biasing claw (33) is extended downward at a position near the center. On the outer surface of the operation section (25), a film-like membrane (34) on which an operation display is printed is attached in a watertight manner.

In the above construction, the basic operation is the same as that of the conventional example, and will be omitted. Even if the water that has entered through the gaps between the main body during water supply or cleaning jumps to jump on the control board (5) when moving or carrying the main body, the waterproof cover (3
It is blocked by 0) and does not reach the control board (5). Even if water tries to enter from the fitting portion between the storage part (20) and the waterproof cover (30), the rib (32) extended from the waterproof cover (30) cannot get over the storage part (20). And the space formed by the waterproof cover (30) cannot penetrate. When the body is turned upside down, the storage part (20)
Even if water tries to enter from the fitting portion between the waterproof cover (30) and the waterproof cover (30), the water enters the groove (29) of the storage portion (20) and cannot get over the groove (29).
0) and the waterproof cover (30) cannot penetrate into the space formed. Therefore, the infiltrated water does not adhere to the control board (5) to cause malfunction, and a highly reliable electric water heater can be obtained.

The fitting of the waterproof cover (30) and the accommodating part (20) is performed by connecting the waterproof cover (30) to the back plate (10) and the accommodating part (2).
Since it is configured to be sandwiched by (0), variations in molding of resin parts, variations during assembly, etc. occur and a gap is generated in the fitting portion between the groove (29) and the rib (32), but elasticity is reduced. Since the biasing claw (33) which it has is extended to the waterproof cover (30), the back plate (10) presses the biasing claw (33) and the back plate (10) is fixed by the fixing screw (12). In order to fix it to the container (2) via the base (4), the waterproof cover (3
0) is pressed by the back plate (10) through the biasing claws (33) into the storage section (20). Therefore, the gap between the waterproof cover (30) and the fitting portion of the storage portion (20) does not vary between products, and the watertightness is always maintained.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the body (1), the container (2), the heating element (3), the base (4), the control board (5),
Locking part (7), upper frame (8), opening (9), back plate (1
0), mounting bracket (11), fixing screw (12), lid (13), water pipe (14), discharge port (15), temperature detecting element (16), air pump (17), push plate (1)
8), steam passage (19), storage section (20), upper surface (2)
1), side surface (22), bottom surface (23), side wall (24), operating part (25), light emitting diode (26), switch (2)
7), through hole (28), groove (29), waterproof cover (3
0), opening (31), rib (32), biasing pawl (3)
3), the membrane 34 has the same function and has the same number as in the first embodiment. The first groove inner wall (3) is located relatively outside and forms the outer wall of the groove (29).
A second groove inner wall which is an outer peripheral rib that fits in 6) and contacts the groove bottom portion (37), and (38) is located inside the outer peripheral rib (35) and forms an inner wall of the groove (29). (3
9) and the gap between the groove bottom (37) and 0.
It is an inner peripheral rib that forms a gap of 2 mm to 0.4 mm.

In the above construction, the basic operation is the same as that of the first embodiment, and will be omitted. Even if the water that has entered through the gaps between the main body during water supply or cleaning jumps and tries to adhere to the control board (5) when moving or carrying the main body, it is blocked by the waterproof cover (30) and reaches the control board (5). do not do. Even if water enters from the fitting portion between the storage portion (20) and the waterproof cover (30), it extends from the waterproof cover (30) and the first inner groove wall (36) of the groove (29) and the groove bottom ( Three
Since the outer peripheral ribs (35) that are watertightly fitted and abutted on the inner wall (7) cannot be passed over, water does not enter the space formed by the storage portion (20) and the waterproof cover (30). In the unlikely event, the outer peripheral rib (35), the first inner wall (36) of the groove and the groove bottom (3
Even if the watertightness of 7) is lost, the outer peripheral rib (35)
The water that has crossed over and penetrated into the inner peripheral rib (38) has a gap of about 0.2 mm to 0.4 mm and tries to pass through the gap between the inner peripheral rib (38) and the groove bottom (37) due to the surface tension of the water itself. It will be constrained between the groove bottoms (37). Therefore, most of the infiltrated water can be waterproofed by the watertightness of the outer peripheral rib (35), the first groove inner wall (36) and the groove bottom (37), but in the event that there is infiltrated water that has surpassed the outer peripheral rib (35). Even if it does, it does not adhere to the control board (5) because it can be waterproofed by the inner peripheral rib (38) and the groove bottom part (37), and therefore, the infiltrated water adheres to the control board (5). The malfunction does not occur, and a more reliable electric water heater can be obtained.

In the first embodiment, the biasing claw (3
Although the waterproof cover (30) is urged to the storage part (20) by the back plate (10) through (3), the waterproof cover (30) is provided with locking claws and is locked on the base (4). You may lock to a part using the elasticity of a locking claw.

[0032]

As is apparent from the description of the above embodiments, the electric water heater of the present invention comprises a cylindrical body, a bottomed container housed in the body, and a container arranged at the bottom of the container. A heating element for heating the liquid contained therein, a base mounted on the lower part of the body, a back plate for closing the lower part of the base, and a control circuit below the container and included in the base. Since the upper and side surfaces of the control circuit are watertightly covered and a holder opened downward, a waterproof cover that substantially closes the opening of the holder,
Even if the water that has entered through the gaps between the main body during water supply or cleaning jumps when the main body is moved or carried and tries to adhere to the control circuit, it is blocked by the waterproof cover and does not reach the control circuit, resulting in higher reliability. Further, according to the present invention, since the holder and the base are integrally formed, the number of parts is small and the assembling is simple, so that it is possible to provide an economical electric water heater. Further, according to the present invention, since the groove is provided substantially on the outer periphery of the holder, the rib is extended substantially on the outer periphery of the waterproof cover, and the rib is fitted in the groove, the holder and the waterproof cover are fitted together. Even if water invades from the part, it does not enter the space formed by the holder and the waterproof cover because the rib extended from the waterproof cover cannot be overcome. If you turn the body upside down,
Even if water tries to enter from the fitting portion of the holder and the waterproof cover, the water does not enter the space formed by the holder and the waterproof cover because the water enters the groove of the holder and cannot cross the groove. Therefore, the water that has penetrated into the main body does not adhere to the control circuit and malfunctions, and reliability is improved. Further, according to the present invention, the rib of the waterproof cover is composed of the outer peripheral rib and the inner peripheral rib, and the inner peripheral rib is formed lower than the outer peripheral rib. Even if you try to jump on the control circuit when moving or carrying it, it will not reach the control circuit because it is blocked by the waterproof cover, and if water enters from the fitting part of the holder and the waterproof cover, Since it is not possible to get over the outer peripheral rib that extends and fits and contacts the groove bottom of the groove in a watertight manner, it does not penetrate into the space formed by the holder and the waterproof cover. Even if the outer rib and the bottom of the groove are no longer watertight, the water that has passed over the outer rib and invades will try to pass through the gap between the inner rib and the bottom of the groove with a gap of about 0.2 mm to 0.4 mm. However, due to the surface tension of the water itself, it is constrained between the inner peripheral rib and the groove bottom. Therefore, most of the infiltrated water can be waterproofed by the watertightness of the outer peripheral ribs and the bottom of the groove, but even if there is infiltrated water that gets over the outer peripheral ribs, it can be waterproofed by the inner peripheral ribs and the bottom of the groove. There is no adhesion of
It is possible to prevent the invading water from adhering to the control circuit to cause a malfunction, and it is possible to obtain a more reliable electric water heater. Also, because the holder is pressed and fixed by the back plate, the holder can be fixed by the back plate and the fixing structure of the waterproof cover can be omitted, and a more reliable electric water heater with a simple structure can be provided. Obtainable.

Further, according to the present invention, since the elastic cover has the elastic biasing claw extending downward and pressed by the back plate, the waterproof cover and the holder are fitted to each other by the back plate. Since it is sandwiched between the holder and the holder, variations in molding of resin parts and variations in assembly occur, but since the elastic biasing pawl is extended to the waterproof cover, the biasing pawl can be used on the back plate. Since the waterproof cover is always pressed against the holder via the biasing claws because it is always pressed, there is no product-to-product variation in the fitting gap between the waterproof cover and the holder, and water-tightness is always maintained. You will get the electric water heater of. Furthermore, the present invention can provide a highly reliable and economical electric water heater which can improve the watertightness and can further simplify the configuration.

[Brief description of drawings]

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

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

FIG. 3 is a partially enlarged sectional view of the electric water heater showing the first embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of an electric water heater showing a second embodiment of the present invention.

FIG. 5 is a sectional view of a conventional electric water heater.

[Explanation of symbols]

 1 Body 2 Container 3 Heating Element 4 Base 5 Control Board (Control Circuit) 10 Back Plate 20 Storage Section (Holder) 21 Top Side 22 Side Side 23 Bottom 24 Side Wall 25 Operation Section 26 Light Emitting Diode (Display Member) 27 Switch 29 Groove 30 Waterproof Cover 31 Opening 32 Rib 33 Energizing claw 35 Outer peripheral rib 38 Inner peripheral rib

Claims (7)

[Claims] 1. A tubular body, a bottomed container housed in the body, a heating element arranged at the bottom of the container for heating a liquid contained in the container, and a lower part of the body. Mounted on the base, a back plate that closes the lower part of the base, a control circuit below the container and contained in the base, and a top and side surfaces of the control circuit that are watertightly covered and below. An electric water heater comprising an open holder and a waterproof cover that substantially closes the opening of the holder. 2. The holder and the base are integrally formed.
The electric water heater described. 3. The electric water heater according to claim 1, wherein a groove is provided substantially on the outer periphery of the holder, and a rib is extended substantially on the outer periphery of the waterproof cover to fit the rib in the groove. 4. The electric water heater according to claim 1, wherein the rib of the waterproof cover is composed of an outer peripheral rib and an inner peripheral rib, and the inner peripheral rib is formed lower than the outer peripheral rib. 5. The electric water heater according to claim 1, wherein the holder is pressed and fixed by the back plate. 6. The electric water heater according to claim 1, wherein an elastic biasing claw is extended downward on the waterproof cover and is pressed by the back plate. 7. A tubular body, a bottomed container housed in the body, a heating element arranged at the bottom of the container to heat a liquid contained in the container, and a lower part of the body. A box shape in which an operating portion is provided on a side wall that is mounted and stands up in a substantially cylindrical shape, and a part of the side wall including the operating portion, the upper surface and the side surface are watertightly configured, and a part of the bottom surface is opened. The base part integrally forming the storage part, a waterproof cover for closing the opening part of the storage part, a switch built in the storage part and operated by the operation part or the display can be confirmed from the operation part. An electric water heater comprising a control circuit having a display member and a back plate that substantially closes the bottom of the base.