JPH0655193B2 - 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 applies an AC voltage to an electromagnetic pump 51 shown in FIG. 6, for example, 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 raise the pressure in the container 52 and draw the liquid out of the body. 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 it 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 penetrate into the knob 54, causing malfunction. 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. And the variable part is housed in a substantially box-shaped case, and a protrusion having a shape corresponding to the mounting hole of the switch for controlling ON / OFF of the electric power to the electric pump is formed in the case. At the same time, a rib is formed on a part of the cover covering the opening of the case to prevent the switch from being attached to or detached from the protrusion of the case when the cover is attached.

Action According to the above configuration, since the variable portion and the knob interlocked with the variable portion are rotational movements, adjustment at the time of operation is easy, and a switch for controlling ON / OFF of energization of the electric pump is provided. And a protrusion formed on the case to store
Since it is fixed with a cover that covers the opening of the case, the number of parts such as screws for fixing the switch can be reduced, and the operability and assemblability are greatly improved.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

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 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 pushes a lock knob 4 provided at the front thereof. As a result, it is possible to open / close the opening of the container 2 and attach / detach to / from the main body 1. Reference numeral 5 is a vapor passage communicating with the inside of the container 2, and 6 is a heating element for heating the liquid in the container 2.
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 led to the outside of the body through a second communication pipe 14 that connects the discharge port 12 of the No. 2 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. 5 shows an example of a circuit using the variable resistor 15 as a 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 pump 7 is shown. It controls the rotation speed of.

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. Reference numeral 24 is a switch for turning on and off the power supply to the 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 is pressed against the lever 26 of the switch 24. When the knob 16 is rotated, the arm 2 of the bearing 18 that interlocks with the knob 16 is rotated.
When 5 is pressed against the lever 26 of the switch 24, the power to the motor 8 is 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 in conjunction with the knob 16, the rotary shaft 2 of the variable resistor 15 is rotated.
0 rotates, the resistance value changes, and the voltage applied to the motor 8 increases 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 so that the amount of liquid to be discharged is in a desired state.

Here, as to how to mount the switch 24 on the case 19, a protrusion 28 having a shape corresponding to the mounting hole portion 27 of the switch 24 is formed on the case 19, and the switch 24 is inserted into the protrusion 28. In this state, the knob 16
The direction of the force applied to the switch 24 at the time of is fixed.

Further, a part of the cover 23 is extended to form a rib 29 for restricting the movement of the switch 24 in the insertion direction of the case 19 into the protrusion 28 to fix the switch 24. Therefore, by mounting the cover 23 on the case 19, the switch 24 can be regulated in all directions, screws for fixing the switch 24 are not required, and the cost of parts can be reduced and the assembly can be simplified. Further, in such a configuration, the switch 24 is fixed and the periphery of the switch 24 is surrounded, so that a waterproof effect such as prevention of adhesion of water or the like to the switch 24 can be obtained.

EFFECTS OF THE INVENTION As is clear from the description of the above embodiments, in the electric water heater of the present invention, the variable portion for adjusting the rotation speed of the pump and the knob have a rotary motion, and the case for accommodating the variable portion is provided with a protrusion. The switch is inserted, and the ribs that regulate the switch are formed on the cover, making it easier to finely adjust the amount of liquid drawn out. Also, the screws that fix the switch can be reduced, and operability is improved. , It has various excellent effects such as improvement of assembling property and reduction of parts cost.

[Brief description of drawings]

FIG. 1 is an enlarged 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 is a longitudinal sectional view of the entire water heater. FIG. 5 is a perspective view of the entire appearance of the water heater, FIG. 5 is a motor drive circuit diagram of the water heater, and 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 ... Operating part, 18 ... Bearing, 19 ... Case, 23 ... Cover, 24 ... Switch, 27: mounting hole, 28: protrusion, 29: rib.

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 for controlling the operation of the drive circuit, a variable portion that constitutes a part of the drive circuit and adjusts the rotation speed of the pump by an external operation, a knob that is interlocked with the variable portion, and a power supply to the electric pump. And a switch for controlling ON and OFF, and the variable operation of the variable portion is used as a rotational movement to be housed in a substantially box-shaped case, and a protrusion having a shape corresponding to the mounting hole of the switch is provided in the case. A rib for preventing the switch from being attached to or detached from the protrusion of the case when the cover is attached is formed in a part of the cover that covers the opening of the case while inserting the mounting hole of the switch into the protrusion. Electric hot water formed The device.