JPH01129810A - Electric hot-water apparatus - Google Patents

Abstract

PURPOSE: To prevent the adhesion of water to a variable part in a case by rotating the variable part and a knob regulating the rotational speed of a pump and forming the lower surface of the case housing the variable part as an opening part and forming a hole part permitting the rotary shaft of the variable part to pass in the upper part of the case. CONSTITUTION: A knob 16 is made freely rotatable by external operation and the number of rotations of a pump 7 is adjusted by regulating the angle of the knob 16 to set a liquid lead-out amt. to a favorite state. A case 19 housing a variable resistor 15 has its lower surface as an opening part and a hole part 21 permitting the rotary shaft 20 of the variable resistor 15 to pass is provided to the upper part of the case 19 and this hole part 21 clamps the rotary shaft 20 by a nut 22 so as not to form a gap. Even if water penetrates from the gap between the knob 16 and a water heater main body 1, the possibility of the penetration of water into the case 19 is not almost generated. Since a flange part 28 covering the upper part of the rotary shaft 20 of the variable resistor 15 is formed to a bearing 18, the adhesion of water to the rotary shaft 20 provided outside the case 19 can be also prevented and waterproofness is further enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric water heater equipped with an electric hot water supply function for heating and keeping a stored liquid warm.

BACKGROUND OF THE INVENTION A conventional electric water heater having an electric hot water supply function is, for example, as shown in Japanese Utility Model Application Publication No. 173247/1983, in which an AC voltage is applied to an electromagnetic pump 61 shown in FIG. The pressurized air from the pump 51 is supplied to the container 6.
2 to raise the pressure inside the container 52 and lead the liquid out of the container. A switch 65 that controls ON-OFF energization to
It was used to open and close the valve, and to control whether or not to discharge liquid.

Problems to be Solved by the Invention In such a conventional configuration, when the liquid in the container 62 is drawn out, it is drawn out only at a preset constant flow rate. When pouring into a large-capacity container, there is a risk of boiling water splashing out with too much force and causing burns, and conversely, when pouring into a large-capacity container such as a pot, it takes time and is not easy to use. was there.

In addition, since it is an air pressurization type, it is necessary to close the steam passage when discharging the liquid. In this case, a mechanism is required to close the steam passage in conjunction with the suppression operation of the knob, which increases the operating load and requires a complicated configuration. , there were problems such as increased costs. Furthermore, since the knob 54 is provided on the lid part 63, when the lid part 63 is removed from the main body and washed, water droplets may adhere to or enter the inside of the knob 64, resulting in malfunction. There was a possibility that this could be the cause.

The object of the present invention is to provide an electric water heater that solves these problems.

Means for Solving the Problems In order to solve the above conventional problems, the present invention provides a means for adjusting the rotational speed of an electric pump by external operation, that is, a variable operation of a variable part in a pump drive circuit. is a rotating motion, and 1 is placed on the top of a roughly box-shaped case with an open bottom.
．． forming a hole through which the rotating shaft of the variable part passes, and fixing and storing the variable part with the rotating shaft protruding outside the case;
A knob is connected to it, and the opening of the case is covered with a cover.

Function According to the above configuration, since the variable part and the interlocking knob are rotary, it is easy to make adjustments during operation, and the case housing the variable part has an opening on the bottom surface, and the upper and side surfaces of the case. is designed with almost no gaps other than the hole where the rotating shaft of the variable part goes out of the case, so water droplets that enter through the gap between the water heater body and the knob have almost no effect on the variable part. It is something that can be done.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

FIG. 3 is a longitudinal sectional view of an electric water heater according to an embodiment of the present invention, and FIG. 4 is a perspective view showing the appearance of the electric water heater. In FIGS. 3 and 4, 1 is A water heater main body, 2 is a container with an opening at the top disposed in the main body 1, 3
is a lid that covers the opening of the container 2, and the lid 3 can be opened and closed from the opening of the container 2 and can be attached to and removed from the main body 1 by pressing a lock knob 4 provided at the front of the lid 3. . 6 is a steam passage communicating with the inside of the container 2, and 6 is a heating element that heats the liquid in the container 2. Reference numeral 7 denotes an electric pump, which is driven by a motor 8 and sucks liquid through a first communication pipe 11 that communicates a guide hole 9 provided at the bottom of the container 2 with a suction port 1o of the pump 7. The liquid is led out of the container through a second communication pipe 14 that communicates the discharge port 12 and the outlet 13 to the outside of the container.

Reference numeral 16 denotes a rotary variable resistor that constitutes a part of the drive circuit that controls the operation of the pump 7 and is a means for adjusting the differential 1/0 rotation speed, that is, a variable part. Reference numeral 16 denotes a knob that is linked to the variable resistor 16, and this knob 16 constitutes an operating section 17 together with several parts that will be described later.

FIG. 6 shows an example of a circuit in which a variable resistor 16 is used as a speed adjusting means for the pump 7. By changing the voltage applied to the motor 8 with the variable resistor 16, the motor 8
That is, the rotation speed of the pump 7 is controlled.

1 and 2 show an example of the configuration of the operating section 17, and 18 is a bearing that is interlocked with the knob 16 and the autorotating variable resistor 16. Reference numeral 19 denotes a case that houses the variable resistor 16, and this case 19 has a substantially box-like structure with an open bottom, and a hole 21 through which the rotating shaft 2o of the variable resistor 16 passes is formed in the upper part. . The variable resistor 16 is inserted into the case 19 from below and is fixed in the hole 21 with a nut 22. A cover 23 covers the opening of the case 19. Reference numeral 24 denotes a switch for turning on and off power to the motor 8 that drives the pump 7, and is attached to the case 19 in such a position that a protrusion 26 formed on the bearing 18 comes into pressure contact with the lever 26 of the switch 24. When the knob 16 is rotated and the protrusion 26 of the bearing 18 interlocked therewith is in pressure contact with the lever 26 of the switch 24, the power to the motor 8 is turned off. Knob 1
6 in the opposite direction, the lever 26 of the switch 24 becomes free, the power to the motor 8 is turned on, and in conjunction with the knob 16, the rotary shaft 2o of the variable resistor 160 rotates. As the resistance value changes, the voltage applied to the motor 8 increases, and the pump 7
The number of rotations increases. By adjusting the angle of this knob 160, the number of rotations of the pump 7 can be adjusted to adjust the amount of liquid delivered to the desired state.

The operating section 17 is composed of the above-mentioned parts, and the operating section 17 is attached to the main body 1 with the knob 16 disposed in a hole 27 formed in the main body 1.

In such a configuration, since the knob 16 is rotatable by external operation, a gap is required between the hole 27 of the main body 1 and the outer periphery of the knob 16, although it is small. The concern is that water or the like may enter through the gap and have an adverse effect on the operating section 17, especially the variable resistor 16.

However, in one embodiment of the present invention, the variable resistor 1
The case 19 that houses the variable resistor 16 has an opening on the lower surface, and a hole 21 through which the rotating shaft 2o of the variable resistor 16 passes through the upper part.
Since the rotating shaft 20 is tightened with a nut 22 in the hole 21, there is no gap. Therefore, even if water or the like enters through the gap between the knob 16 and the water heater main body 1, there is almost no possibility of it entering the case 19.

Furthermore, in this embodiment, since the bearing 18 is formed with a flange 28 that covers the upper part of the rotating shaft 2o of the variable resistor 16, it is also possible to prevent water from adhering to the rotating shaft 20 outside the case 19. This will further improve waterproofness.

Effects of the Invention As is clear from the description of the embodiments above, in the electric water heater of the present invention, the variable part and the knob for adjusting the rotational speed of the pump are rotated, and the case housing the variable part has an open bottom surface. As a part, a hole is formed in the upper part of the case to allow the rotating shaft of the variable part to pass through, making it easier to finely adjust the amount of liquid drawn out. Even if water or the like enters, it will not adhere to the variable parts inside the case, and as a result, malfunctions will not occur.

[Brief Description of the Drawings] Fig. 1 is an enlarged exploded perspective view of the main parts of an electric water heater showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is the whole of the water heater. 4 is a perspective view of the overall appearance of the water heater, FIG. 6 is a motor drive circuit diagram in the water heater, and FIG. 6 is a longitudinal sectional view of a conventional electric water heater. 1...Water boiler body, 2...Container, 3
... Lid body, 6 ... Heating element, 7 ...
... Pump, 16... Variable resistor (variable part),
16...Knob, 17...Operation unit, 1
8...Bearing, 1e...Case, 20.
... Rotating shaft, 21 ... Hole, 23 ...
...Cover, 28. River...Tsubabe. Name of agent: Patent attorney Toshio Nakao and 1 other person/δ
---Glaze holder 1 (/-11 Cane 20-11 Fixed rotating shaft 1! E4rIJ Fig. 5 Fig. 6

Claims (2)

[Claims] (1) A water heater main body, a container disposed within the main body and containing liquid, and a lid body that covers the opening of the container;
A heating element that heats the liquid in the container, an electric pump that discharges the liquid in the container to the outside of the container, a drive circuit that controls the operation of this pump, and a part of this drive circuit, a variable part that adjusts the rotational speed of the pump by external operation, the variable operation of the variable part being rotational movement;
A hole through which the rotating shaft of the variable part passes is formed in the upper part of a substantially box-shaped case with an open bottom, and the variable part is fixed with the rotating shaft protruding outside the case. Store and
An electric water heater having a knob connected thereto and an opening of the case covered by a cover. (2) A bearing is provided which is interlocked with the rotating shaft of the knob and the variable part and transmits rotational motion applied to the knob to the variable part, and the bearing is provided with a flange part that covers the upper part of the variable part. The electric water heater according to item 1.