JPH0329616A - Electric water heater - Google Patents

Abstract

PURPOSE:To eliminate a possibility of malfunction of a circuit board the to the ingress of a water drop or the like from the outside by enclosing the upper surface and surroundings of a control circuit part on the circuit board with a board cover, and enclosing the lower surface of the control circuit part with a base bottom wall and a longitudinal wall erected on the bottom wall. CONSTITUTION:The bottom part of a container 2 is provided with an exothermic body 3 for heating liquid contained thereon. On the other hand, a control circuit part for detecting the condition of water boiled with the exothermic body 3 and controlling a heat insulation condition, and electric parts or the like are respectively arranged on a single circuit board 13. This circuit board 13 is placed in a space at the lower part of the container 2, and the upper surface and surroundings of the board 13 are enclosed with a board cover 17. Furthermore, a longitudinal wall 19 is erected on the upper surface of the bottom wall 18 of a base 12 for supporting a body 1, and the longitudinal wall 19, the bottom wall 18 of the base 12 and the board cover 17 enclose at least the control circuit part 16. In addition, the bottom opening part of the base 2 is closed with a back plate 23 from the outside, and the back plate 23 is clamped to a fixture 24 fastened to the bottom part of the container 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industry] Second Ikawa Field The present invention relates to an electric water heater mainly used in general homes, offices, and the like.

[Conventional technology]

Conventionally, this type of electric water heater has a heating element (33) disposed at the bottom of a liquid storage container "a" (32) housed in a cylindrical body (3l), as shown in FIG. 4, for example. Yong Z(
32) A four-way) 1 (board (34) is arranged in the inner space of the lower body (3l), and the upper surface and surroundings of this circuit board (34) are surrounded by a synthetic resin board cover (35). This J. (board cover (35) and circuit board (34)
is attached using screws (FG), while the container (32
) 1. The flange part provided on the outside of the edge IN II (
37) is fixed to the It end opening 121 part of the body (31)? When the ITdi is placed on the member (38) 1 and the mounting bracket (39) is fixed to the outer bottom of the container (32), the base (40) that supports the body (3rd eye) is installed. A back plate (4l) is disposed on the outer bottom of the body (31) by fastening this back plate (4I) and the mounting bracket i (39) with screws (42). ) was assembled in such a way that it was supported from the L.

The circuit board (34) also includes a microcomputer (43) that forms part of a control circuit that detects the heating state of the water by the heating element (33) and controls the heat retention state, as well as a power supply unit, a relay oscillator, and other electrical components. Parts are installed.

[Problem to be solved by the invention]

However, in the conventional configuration as described above, the circuit board (
34) is only surrounded by the -L side and the surrounding area by the board cover (35), and the lower side is open, so when injecting water etc. into the container i (32), for example, In the event of an accidental overflow, the overflowing water will flow up the outer wall of the body (30), and the joint between the body (3l) and the base plate, the back plate (4l), and the J^ stand (40). Water droplets enter the body (3I) through the gap created at the joint of the circuit board (34) installed in the body (31).
) may become wet, causing leakage between the terminals of the control circuit, for example, the microcomputer (43), causing malfunctions or creating an unsafe mode such as continuous boiling.

The present invention was made to solve these problems, and an object of the present invention is to provide an electric water heater that eliminates the risk of malfunction of the circuit board due to the intrusion of water droplets from the outside.

[Means to solve the problem]

In order to achieve such an object, the electric water heater of the present invention houses a bottomed cylindrical container 4 in a cylindrical body whose upper and lower ends are open L1, and has a spout member at an opening at the upper end of the body. Place the flange formed on the outer periphery of the upper opening edge of the container on the 1st member, and place 1 part of the upper opening of the container on the 1st part of the upper opening of the body. The lid is opened and closed [1], and a heating element is installed at the bottom of the container 4 to heat the liquid contained in the container. The control port circuit board for controlling the state and electrical components are provided on a single circuit board (board), and this circuit board is disposed in the space below the container, and the upper surface and surrounding area of the circuit board are is surrounded by a J& board cover, and a vertical wall is provided on the top surface of the bottom wall of the base that supports the body, and this vertical wall)
At least the control circuit section is covered by the bottom wall of the k stand and the board cover, the open L1 bottom of the base is closed from the outside by a back plate, and the back plate is fixed to the bottom of the cabinet. It is characterized by being fastened to a metal fitting.

[For production]

According to the above configuration, the g! J[
The upper surface and periphery of the 1-way section are covered with a substrate cover, and the lower side is connected to the bottom wall of A) and the vertical M:! ．． If you accidentally overflow when pouring water, or if water splashes on the outer wall of the body while water is being supplied from a sink, etc., the inside of the body may leak from the joint between the body (between the body and the stand or the back plate), or between the Even if water gets into the tank, the water well should be controlled by the board cover, people (bottom of the stand and vertical walls).
t2 people to the 1st path section are gll+l・, thereby preventing leakage of electrical components, etc. that make up the control circuit section.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on illustrations.

In FIG. 3, the electric water heater according to this embodiment has a bottomed cylindrical container (2) housed in a cylindrical body (l) whose lower end is open, and this container 4. A heating element (3) for heating the liquid contained in the container (2) is provided at the inner bottom of the body (2), while a lid that covers the upper end opening of the container (2) is provided at the upper end opening of the body (l). The body (4) can be opened and closed automatically 7[
4 (2) on the front side of the body (1).
A zero discharge part (5) is provided to discharge the liquid inside, and by operating the mechanical operation part (6) provided on the lid (4), the liquid is heated by the heating element (3). Contents''?: The boiling water in i (2) is produced from Ill Yamabe (5). (7) is the handle P for holding, and the body (1)
Attached to the upper outer surface of the synchronous fl rtE.

Something like this. (In the electric water boiler having this configuration, a 111 ring-shaped synthetic resin spout member (8) is attached to the upper end opening 121 part of the body (0), and the container (
A flange portion (9) is formed horizontally on the outer periphery of the 41 end opening edge of 2), and the container (2) is attached to the body (+).
In the stored state, the container packing (I
The flange portion (9) of the container (2) is placed through the container (I).

In FIG. 1, (+2) is a base that supports the body (1), and is fitted into the lower end opening of the body (1), and this base (12) and the body (1) A circuit board (13) and a board cover (17) that covers the upper surface and circumference of the circuit board (03) are arranged in the space below the container (2).

As shown in FIG. 2, on the bottom side of this circuit board 03),
A display circuit section (+4) that displays the boiling state and heat retention state of the heating element (3), a reboiling switch section (15) that reboils the water in the container (2), and a display circuit section (+4) that displays the boiling state of the water by the heating element (3). The control circuit section that detects and controls the heat retention state (
16) is provided.

+liJ note] The bottom wall (!8) of the beauty stand (l2) has a large diameter opening in the center, and a vertical wall (! The -L end of this vertical wall (19) is in contact with the lower surface of the circuit board 03), which allows for example the microcomputer (20) or the relay oscillation W (21 ) The control circuit section (l6), display circuit section (l4), and operation circuit sections such as the reboil switch section (I5), which are made up of I!IJ path components through which weak current flows, such as Wall (l8) and vertical wall (l9
) and the board cover (17) to prevent water droplets from entering the control circuit section 06).

In addition, the circuit board (I3) covered by the bottom wall (l8) and vertical wall (19) of the base (l2) and the board cover (I7)
It is preferable to consider the wiring pattern and the arrangement layout of the parts so that these wiring patterns and parts are not located in the part (22) of the base (l2) where the board cover (17) comes into contact so that the board is likely to be in a nearly sealed state. .

By fitting the back plate (23) into the opening of the bottom wall (18) of the base (12) described in +1ii from the outside, this bottom wall (l
7) is closed.

? On the other hand, a U-shaped mounting bracket (24) is fixed to the bottom of the container (2), and the lower horizontal plate portion of the mounting bracket (24) and the back plate (23) are attached. By fastening with screws (25), the back plate (23) is fixed to the bottom of the container (2), thereby opening the body (top opening 1).
The lower end opening of the body (1) is urged downward by the flange part (9) of the container (2) through the first member (8) and the fourth packing (11), and the lower end opening of the body (1) is
4), is biased upward via the back plate (23) and the base (l2). Therefore, body (1) is
), it is assembled in a state in which it is supported from below through 1.

In this embodiment, the control circuit section (16) is covered in a nearly hermetically sealed state, but it is not necessarily necessary to be in a hermetically sealed state as long as it is prevented from being exposed to water droplets that have entered from the outside.

Also, the same effect can be obtained whether the vertical ridge (!9) installed from the bottom wall (18) of the j■ (joint (l2)) to the X7. It is something that can be done.

Specifically, in the above embodiment, as shown in FIG. 2, the display circuit section (+4) and the operating circuit sections such as the reboil switch section (I5) are arranged centrally near the control circuit section (IG). However, even if the display circuit section (I4), the operation circuit section, the power supply section, and the control circuit section (eyes) are placed in separate locations, and only the control circuit section (!6) is covered. good.

〔Effect of the invention〕

As explained below, when using the electric water heater of the present invention, the control circuit section and electrical components for detecting the water heating state by the heating element and controlling the heat retention state are provided on the +11 circuit board, and this circuit board is arranged in the space below the container, and the circuit board is surrounded by a board cover, and the bottom wall L of the base that supports the body is provided.
A vertical wall is erected on the surface, and the vertical wall, the bottom wall of the base, and the board cover cover at least the control circuit section, so in the unlikely event that water overflows and the body is damaged. ，! Water droplets may enter from the joint between the back plate and J^, or water may splash onto the outer wall of the body during water supply during the sinking process, and water may leak into the body from the joint between the back plate and J^ due to the distortion of the μ plate. Even if water drops enter the control circuit section, the board cover, the bottom wall of the base, and the vertical wall prevent the water droplets from entering the control circuit section, which is advantageous in that it prevents the electrical components that make up the control circuit section from leaking. The result was a powerful effect.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments of the present invention, with Figure 1 being an enlarged sectional view of the main parts, Figure 2 being a bottom view of the circuit board, and Figure 3 being a part of the overall structure. This is a cutaway diagram. FIG. 4 is a partially cutaway diagram showing the overall structure of a conventional example. (1)...Body, (2)...Appearance, (3)...
・Heating element, (4)...Lid, (8)...Note 11 member, (9)...Flange part, (12)...Base, (1
3)...F+1 road section (board, (14) (15)...electrical section 'ii'+ type, (I6)...control eye 1 road section, (l
7)...Board cover, (l8)...Bottom wall of l & stand,
(l3)... Vertical wall, (23)... Back plate, (24)...
...Mounting bracket.

Claims (1)

[Claims] (1) A bottomed cylindrical container is housed in a cylindrical body whose upper and lower ends are open, and a spout member is attached to the upper end opening of the body, and the upper end of the container is placed on the spout member. A flange portion formed on the outer periphery of the opening edge is placed, a lid body that covers the upper end opening of the container is attached to the upper end opening of the body so as to be openable and closable, and a lid body that is housed in the container is mounted on the bottom of the container. A heating element is installed to heat the liquid, and a control circuit and electrical components for detecting the boiling state of the water by the heating element and controlling the heat retention state are provided on a single circuit board, and this circuit board is mounted on a single circuit board. The circuit board is disposed in the space below the container, and the top surface and periphery of the circuit board are surrounded by a board cover.Furthermore, a vertical wall is erected on the top surface of the bottom wall of the base that supports the body. At least the control circuit section is covered by the wall, the bottom wall of the base, and the board cover, the opening bottom of the base is closed from the outside by a back plate, and the back plate is fixed to the bottom of the container. An electric water heater characterized by being fastened to a metal fitting.