JP3132188B2 - Electric water heater - Google Patents

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, an electric water heater of this type is as shown in FIG. (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 located below the container (2). It was a base with an open side, provided with a control board (5) for forming a control circuit in the space inside the base (4), and the top and sides of the control board (5) were covered with a holder (6). A locking portion (7) provided outside the periphery of the upper end opening of the container (2) is provided at the center opening (9) of an upper frame (8) provided at the upper part of the body (1) and having a center opening. ), And a back plate (10) is provided at the bottom of a base (4) that supports the body (1). The back plate (10) and the bottom of the container (2) The back plate (10) pulls the container (2) by fastening the mounting bracket (11) fixedly provided with the fixing screw (12), and the container (2) is pulled through the upper frame (8). Body (1)
To the base (4) side. Therefore, the body (1) is assembled in a state of being sandwiched between the upper frame (8) and the base (4). A cover (13) is attached to one end of the upper frame (8) so as to be openable and closable, and covers a top opening of the container (2). (14) is a water guide 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 opened outward. The control board (5) receives a signal from a temperature sensing element (16) provided thermally below the bottom of the container (2) substantially at the bottom center, detects the state of water being heated by the heating element (3), and generates a heating element. (3)
The electric power to the electric heater is controlled, and after the completion of the water heater, the heat retention state is controlled to maintain the function of the electric water heater.

The above-mentioned lid (13) incorporates a bellows-shaped air pump (17), and has a push plate (18) provided on the upper part of the air pump (17) and one end on the upper part in the container (2). A steam passage (19) which is open and the other end is open outward.

In this configuration, when water is put into the container (2) and energized, the water eventually boils, the boiling is detected by the temperature detecting element (16), and the control board (5) maintains and controls the heat retaining state. The steam generated during boiling is transferred to the steam passage (1).
It is released outside through 9). In the warm 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 power supply to the heating element (3) while detecting the temperature in the water. When hot water is desired, the push plate (18) is pressed. When the push plate (18) is pushed, the air in the air pump (17) is sent to the upper part of the container (2) by pressure and pushes down the water surface, and the hot water in the container (2) passes through the water guide pipe (14) and the discharge port (15). ). The push plate (18) will be repeatedly pressed until the desired hot water is obtained.

[0005]

However, in the conventional configuration as described above, since the control board (5) is stored in the holder having an open bottom, the control board (5) enters through the gap of the main body at the time of water supply or washing. There is a problem that water jumps when moving or carrying the main body, adheres to the control board (5), short-circuits the electric circuit, and causes the control board (5) to malfunction.

The present invention solves the above-mentioned conventional problems.
In, even if a gap is caused by such on the work between the waterproof cover and holders are used are intended to waterproof effect can be maintained with the groove of the holder by a fitting structure of the rib of the waterproof cover.

[0007] Also, to Shin設double rib structure constituting lower high inner circumferential rib outer peripheral rib approximately the outer periphery of the waterproof cover, a gap is caused by such on the work between the holder and the waterproof cover Even so, the purpose is to maintain the waterproof effect.

[0008] Also, it is an object to prevent the occurrence of a gap of the fitting portion of the holder and the waterproof cover by pressing with the back plate by Shin設biasing pawl having elasticity from waterproof cover downward .

[0009]

In order to achieve the above object, according to the present invention, a cylindrical body, a bottomed container housed in the body, and a bottom portion of the container are provided. A heating element for heating the liquid contained in the container, a base mounted on the lower part of the body, a back plate closing the lower part of the base, and a lower part of the container and included in the base. A control circuit, a holder that covers the upper and side surfaces of the control circuit in a water-tight manner and that opens downward, and a waterproof cover that substantially closes the opening of the holder, and a groove is provided substantially on the outer periphery of the holder. An electric water heater is provided in which a rib is extended substantially on the outer periphery of the waterproof cover and the rib is fitted in the groove.

[0010] Also, the invention of 請 Motomeko 2 wherein, in addition to claim 1, together constitute the ribs of the waterproof cover with the outer circumferential rib and an inner circumferential rib, which forms an inner peripheral rib below the outer peripheral rib .

[0011] Also, the invention of 請 Motomeko 3 described, a cylindrical body, a bottomed container containing within the body is disposed in the bottom of the container, the liquid contained in the container A heating element, a base mounted on the lower part of the body, a back plate closing the lower part of the base, a control circuit below the container and included in the base, and above the control circuit. And a waterproof cover that covers the side surface in a water-tight manner and opens downward, and a waterproof cover that substantially closes the opening of the holder. And an electric water heater configured to be pressed.

[0012]

According to the first aspect of the present invention, 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 second means, the watertightness can be maintained by the inner circumferential ribs even if the intruded water gets over the outer circumferential ribs, and a highly reliable electric water heater can be provided.

According to the third means, even if an attempt is made to create a gap at the fitting portion between the holder and the waterproof cover, the gap can be forcibly pressed by the back plate to prevent the occurrence of the gap and maintain watertightness. Thus, a highly reliable electric water heater can be provided.

[0015]

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 the same numbers as those of the conventional embodiment. (20) is formed of a synthetic resin or the like, and has a base (4), a top surface (21), a side surface (22), a bottom surface (23) having a part opened toward the center, and a side wall (24) of the base (4). 24) a storage part formed of a part of the operation part (25) and integrally formed on the base (4) to form a holder for storing and fixing the control board (5); In processing, it is formed by injection molding, and the mold is split above and below the base (4), and the inner upper surface (21), side surface (22), and bottom surface (23) of the storage portion (20) are slid. It will be molded as a mold configuration. Therefore, in the configuration of the storage section (20), it is necessary to open a part of the bottom surface (23) as a slide type relief part. The operation unit (2
5) is provided with a through hole (28) in a portion located in front of a light emitting diode (26) constituting a display member soldered on the control board (5) and an operation switch (27). . (29) is a side surface (2) of the storage portion (20).
A groove is formed downward along 2), and (30) is formed of an elastic material such as a synthetic resin which substantially closes the opening (31) as a relief portion of the slide type from below. A waterproof cover having a rib (32) extending around the groove (29) on the outer periphery thereof and a base (4)
A biasing claw (33) having elasticity extends downward at a position near the center. On the outer surface of the operation section (25), a film-like membrane (34) on which operation indications are printed is adhered in a watertight manner.

In the above configuration, the basic operation is the same as in the conventional example, and a description thereof will be omitted. Even if water entering from a gap in the main body at the time of supplying or washing water jumps when moving or carrying the main body and tries to adhere to the control board (5), the waterproof cover (3)
0), and does not reach the control board (5). Even if water tries to enter from the fitting part between the storage part (20) and the waterproof cover (30), the water cannot penetrate the rib (32) extended from the waterproof cover (30), so that the storage part (20) And cannot enter the space formed by the waterproof cover (30). If the body is turned upside down, the storage section (20)
Even if water tries to enter from the fitting part of the waterproof cover (30), water enters the groove (29) of the storage part (20) and cannot get over the groove (29).
0) and the space formed by the waterproof cover (30) cannot enter. Accordingly, it is possible to prevent the intruded water from adhering to the control board (5) and malfunctioning, so that a highly reliable electric water heater can be obtained.

The fitting of the waterproof cover (30) and the storage section (20) is performed by attaching the waterproof cover (30) to the back plate (10) and the storage section (2).
0), a gap is generated in the fitting portion between the groove (29) and the rib (32) due to a variation in molding of the resin component and a variation in assembly, and the like. The backing plate (10) presses the biasing claw (33) with the fixing screw (12) because the biasing claw (33) is extended to the waterproof cover (30). In order to fix to the container (2) via the base (4), the waterproof cover (3
0) is pressed by the back plate (10) to the storage portion (20) via the urging claw (33). Therefore, the gap between the fitting portion of the waterproof cover (30) and the storage portion (20) has no variation among products and always maintains watertightness.

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

In the above configuration, the basic operation is the same as in the first embodiment, and a description thereof will be omitted. Even if water entering from a gap in the main body during water supply or cleaning jumps when moving or carrying the main body and tries to adhere to the control board (5), the water is prevented by the waterproof cover (30) and reaches the control board (5). do not do. Even if water tries to enter from the fitting portion between the storage portion (20) and the waterproof cover (30), the water extends from the waterproof cover (30), and the first groove inner wall (36) of the groove (29) and the groove bottom ( 3
Water cannot penetrate into the space formed by the storage portion (20) and the waterproof cover (30) because the outer peripheral rib (35) that fits and abuts on the 7) in a watertight manner cannot be climbed over. The outer rib (35), the first groove inner wall (36) and the groove bottom (3
Even if the watertightness of 7) is lost, the outer circumferential rib (35)
Water penetrates over the inner ribs (38) due to the surface tension of the water itself while trying to pass through the gap between the inner ribs (38) with a gap of about 0.2 mm to 0.4 mm and the groove bottom (37). It will be restrained 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). Even if the inner peripheral rib (38) and the groove bottom (37) can be waterproofed, there is no adhesion to the control board (5). A malfunction does not occur, and a more reliable electric water heater can be obtained.

In the first embodiment, the biasing claws (3
The waterproof cover (30) was urged against the storage portion (20) by the back plate (10) via 3), but the waterproof cover (30) was provided with a locking claw to lock the base (4). The portion may be locked by utilizing the elasticity of the locking claw.

[0021]

According to the invention of the above embodiment of the apparent to claim 1, wherein the description, according to the present invention, even if an attempt infiltration water from the fitting portion of the waterproof cover and holders are used are Shin設a waterproof cover rib Does not penetrate into the space formed by the holder and the waterproof cover because it cannot get over. If the body is turned upside down, even if water tries to enter from the fitting part of the holder and the waterproof cover, water will enter the groove of the holder,
Since it cannot get over the groove, it does not enter the space formed by the holder and the waterproof cover. Therefore, the water that has entered the main body does not adhere to the control circuit and malfunction, so that reliability is improved.

According to the second aspect of the present invention, even if water entering from a gap in the main body during water supply or cleaning attempts to jump and attach to the control circuit when moving or carrying the main body, the waterproof cover prevents the water from entering. Over the outer rib that extends from the waterproof cover and fits and contacts the bottom of the groove in a watertight manner even if water does not reach the control circuit and water tries to enter from the fitting part between the holder and the waterproof cover. Does not penetrate into the space formed by the holder and the waterproof cover. Even if there is water entering over the outer rib, there is no adhesion to the control circuit because the inner rib and the groove bottom can be waterproofed, and the entered water adheres to the control circuit and malfunctions. And a more reliable electric water heater can be obtained.

According to the third aspect of the present invention, the waterproof cover and the holder are fitted so that the waterproof cover is sandwiched between the back plate and the holder. Although it occurs, since the urging claw having elasticity is extended to the waterproof cover, the urging claw is always pressed by the back plate, so the waterproof cover is always pressed by the holder via the urging claw. That is, a uniform and high-performance electric water heater that maintains the water tightness without variation between products in the gap between the fitting portions between the waterproof cover and the holder is obtained.

[Brief description of the 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 cross-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]

 DESCRIPTION OF SYMBOLS 1 Body 2 Container 3 Heating element 4 Base 5 Control board (control circuit) 10 Back plate 20 Storage part (holder) 21 Top surface 22 Side surface 23 Bottom surface 24 Side wall 25 Operation part 26 Light emitting diode (display member) 27 Switch 29 Groove 30 Waterproof Cover 31 opening 32 rib 33 urging claw 35 outer rib 38 inner rib

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-168555 (JP, A) JP-A-3-29616 (JP, A) Japanese Utility Model Application No. 64-40431 (JP, U) Japanese Utility Model Application Hei 4- 28829 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/21 101

Claims (3)

(57) [Claims] 1. A cylindrical body, a bottomed container housed in the body, a heating element disposed at the bottom of the container and heating a liquid housed in the container, and a lower part of the body A base mounted on the base, a back plate that closes the lower part of the base, a control circuit below the container and included in the base, and water-tightly covering the upper and side surfaces of the control circuit and lowering the lower part. It comprises an open holder and a waterproof cover for substantially closing the opening of the holder, a groove is provided substantially on the outer periphery of the holder, a rib is extended substantially on the outer periphery of the waterproof cover, and the rib is fitted in the groove. Electric kettle combined. 2. A with forming the rib of the waterproof cover outer circumferential rib and an inner circumferential rib of claim 1, wherein the electric kettle forming the inner peripheral rib below the outer peripheral ribs. 3. A cylindrical body, a bottomed container housed in the body, a heating element disposed at the bottom of the container and heating a liquid housed in the container, and a lower part of the body. A base mounted on the base, a back plate that closes the lower part of the base, a control circuit below the container and included in the base, and water-tightly covering the upper and side surfaces of the control circuit and lowering the lower part. An electric water heater comprising an opened holder and a waterproof cover for substantially closing an opening of the holder, wherein an elastic urging claw is extended downward on the waterproof cover and pressed by a back plate.