JPH0655195B2 - Electric water heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater having an electric hot water supply function for heating and retaining the contained liquid.

2. Description of the Related Art A conventional electric water heater having an electric hot water supply function, for example, applies an AC voltage to an electromagnetic pump 51 shown in FIG. 7, as disclosed in Japanese Utility Model Laid-Open No. 173247/1985. The pressurized air generated by the pump 51 is stored in the container 52.
A method is used in which the liquid is sent out into the container 52 to increase the pressure in the container 52 and draw the liquid out of the container. The operation method is to push a knob 54 provided on the lid 53 to push the electromagnetic pump 51. The switch 55 for controlling ON / OFF of energization is opened / closed, and is a control of whether or not to lead out the liquid.

Problems to be Solved by the Invention With such a conventional configuration, when the liquid in the container 52 is discharged, the liquid is discharged only at a constant outflow amount set in advance. When putting it in a large capacity container, the momentum is too strong and the hot water may scatter and cause burns. Conversely, when putting it in a large capacity container such as a pot, it takes time and is inconvenient. was there.

Also, since it is an air pressurization type, it is necessary to close the vapor passage when discharging the liquid.In this case, a mechanism that closes the vapor passage in conjunction with the pressing operation of the knob is required, and the operating load becomes large and the complicated configuration However, there were problems such as high cost. Furthermore, since the knob 54 is provided on the lid portion 53, when the lid portion 53 is removed from the main body and washed, water droplets may adhere to the inside of the knob 54 or may enter the knob 54 and cause an operation failure. There was a fear.

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

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a means for adjusting the rotation speed of an electric pump by an external operation, that is, a variable operation of a variable portion in a drive circuit of the pump. At least one projection is formed on either one of the case for housing and fixing the variable part and the cover for covering the opening of the case, and the other part is provided with the projection. A hole is formed at a corresponding position, the protrusion is inserted into the hole, the protrusion is deformed, and the cover is fixed to the case.

Effect According to the above configuration, since the variable part and the knob interlocking with the variable part are rotational movements, adjustment during operation is easy, and the case and the cover are fixed to each other by a protrusion formed on either the case or the cover. After inserting it into the hole formed on the other side, this protrusion is deformed and fixed, so fixing screws etc. are unnecessary, resulting in reduction of parts cost and improvement of assemblability. It is something that can be measured.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 4 and FIG. 5, 1 is a water heater main body, 2 is a container having an upper surface opening arranged in the main body 1, 3 is a lid for covering the opening of the container 2, and the lid 3 is in front of it. By pressing the lock knob 4 provided on the portion, it is possible to open / close the opening of the container 2 and attach / detach to / from the main body 1.
5 is a vapor passage communicating with the inside of the container 2, 6 is the container 2
It is a heating element that heats the liquid inside. An electric pump 7 is driven by a motor 8 and sucks the liquid through a first communication pipe 11 that connects a guide hole 9 provided in the lower portion of the container 2 and a suction port 10 of the pump 7, The liquid is discharged to the outside of the body through a second communication pipe 14 that connects the discharge port 12 of 7 and the outlet 13 to the outside of the body. Reference numeral 15 is a part of a drive circuit that controls the operation of the pump 7, and is a means for adjusting the rotation speed of the pump 7, that is, a rotary variable resistor that is a variable part. Reference numeral 16 denotes a knob that is interlocked with the variable resistor 15, and the knob 16 constitutes an operation unit 17 together with some components described later.

FIG. 6 shows an example of a circuit in which the variable resistor 15 is used as the speed adjusting means of the pump 7. By changing the voltage applied to the motor 8 with the variable resistor 15, the motor 8
That is, the rotation speed of the pump 7 is controlled.

FIG. 1 and FIG. 2 show an example of the configuration of the operating portion 17, and reference numeral 18 denotes a bearing which is linked to the knob 16 and the rotary variable resistor 15. Reference numeral 19 is a case for accommodating the variable resistor 15. The case 19 is formed in a substantially box shape with an open lower surface, and a hole portion 21 through which the rotary shaft 20 of the variable resistor 15 passes is formed in the upper portion. . The variable resistor 15 is inserted into the case 19 from below, and is fixed to the hole 21 with a nut 22. A cover 23 covers the opening of the case 19. 24 is a motor 8 for driving the pump 7.
The arm 25 formed on the bearing 18 is attached to the case 19 in such a positional relationship that the arm 25 formed on the bearing 18 is in pressure contact with the lever 26 of the switch 24. When the knob 16 is rotated and the arm 25 of the bearing 18 interlocking with the knob 16 is pressed against the lever 26 of the switch 24, the motor 8
Is turned off. When the knob 16 is rotated in the opposite direction, the lever 26 of the switch 24 becomes free, the power to the motor 8 is turned on, and the rotary shaft 20 of the variable resistor 15 is linked with the knob 16 and turned on. As the motor rotates, the resistance value changes and the voltage applied to the motor 8 rises accordingly, and the rotation speed of the pump 7 increases. By adjusting the rotation angle of the knob 16, the number of rotations of the pump 7 is adjusted to bring the amount of the liquid discharged from the container 2 into a desired state.

Here, the case 19 is formed with a plurality of protrusions 27, and the cover 23 is formed with holes 28 at positions corresponding to the protrusions 27. In this state, the cover 23 can be freely attached to and detached from the case 19, and the cover 23 can be fixed to the case 19 only with the cover 2.
With the protrusion 27 of the case 19 inserted in the hole 28 of No. 3, the protrusion 27 is deformed by applying an external force,
This is done by making the tip portion larger than the hole portion 28 of the cover 23. According to this method, parts such as fixing screws are unnecessary, and by deforming a plurality of protrusions 27 at once, the labor of assembling can be greatly reduced. FIG. 3 shows a state in which the protrusion 27 is deformed. Furthermore, according to this method,
It is possible to minimize the gap between the case 19 and the cover 23, prevent water droplets from entering the case 19, and improve the waterproof performance.

In the above embodiment, the case 19 has the protrusion 27.
Although the cover 23 is formed with the hole 28, the same effect as in the above embodiment can be obtained even if the cover 23 is formed with a projection and the case 19 is formed with a hole.

EFFECTS OF THE INVENTION As is clear from the description of the above embodiments, the electric water heater of the present invention has a variable portion for adjusting the rotation speed of the electric pump and a knob as a rotary motion, and has a protrusion on either one of the case and the cover. Is formed, and a hole is formed in the other side corresponding to this projection, and the car is fixed to the case by deforming the projection, so that the liquid extraction amount can be finely adjusted. In addition to being easy, the cost of parts can be reduced, the labor for assembling can be reduced, and the waterproof performance can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged exploded perspective view of an essential part of an electric water heater showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same part, and FIG. 3 shows a fixed state of a case and a cover of the electric water heater. FIG. 4 is an enlarged sectional view showing the electric water heater, FIG. 4 is a longitudinal sectional view of the electric water heater, FIG. 5 is an external perspective view of the electric water heater, and FIG. 6 is a motor drive circuit diagram of the electric water heater. FIG. 6 is a vertical sectional view of an electric water heater showing a conventional example. 1 …… water heater body, 2 …… container, 3 …… lid, 6 ……
Heater, 7 ... Pump, 15 ... Variable resistor (variable part), 16 ... Knob, 17 ... Operation part, 18 ... Bearing, 19 ... Case, 23 ... Cover, 27 ... Protrusion,
28 ... hole.

Claims (1)

[Claims] Claim: What is claimed is: 1. A water heater main body, and
And a container for containing the liquid, a lid for covering the opening of the container, a heating element for heating the liquid in the container, an electric pump for discharging the liquid in the container to the outside of the container, and this pump A drive circuit that controls the operation of the drive circuit, a variable part that forms a part of this drive circuit, and that adjusts the rotation speed of the pump by an external operation, a knob that interlocks with the variable part, and the variable part that is housed. A case that is fixed and a cover that covers the opening of the case are provided, and the variable operation of the variable portion is rotational movement, and at least one or more protrusions are formed on either one of the case and the cover. An electric water heater in which a hole is formed at a position corresponding to the protrusion on the other side, the protrusion is inserted into the hole, and then the protrusion is deformed to fix the cover to the case.