JPH047211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a domestic water heater.

BACKGROUND TECHNOLOGY In conventional water heaters of this type, the electric motor that discharges hot water typically uses a commercial power source directly or a transformer to lower the voltage. It was hot.

Problems to be Solved by the Invention However, if a commercial power source (100V AC) is directly used as a motor power source to drive the discharge device in a conventional water heater, the motor itself becomes larger due to the increased number of windings of the motor. . Furthermore, when a low voltage motor is used, a transformer is required, resulting in problems such as a large and expensive discharge device.

The present invention solves these problems,
The purpose of the present invention is to provide a small and inexpensive water heater with a configuration that uses a heat-retaining heater.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a changeover start switch in the heat-retaining circuit that connects the heat-retaining heater and the DC motor in series when the pump is started.

Effect According to the above configuration, by switching the switching start switch when starting the pump, the insulation heater and the DC motor are connected in series and a low voltage is obtained for the motor, so a small DC motor for low voltage is used. As a result, a small and inexpensive water heater can be provided.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 1 denotes an exterior main body of a water heater, and a container 2 for storing hot water is provided inside this exterior main body 1. Reference numeral 3 denotes an inner stopper attached to seal the mouth of the container 2. Reference numeral 4 denotes an upper lid attached to the upper part of the exterior main body 1 so as to be able to be opened and closed. 5 is a check valve, and this check valve 5 penetrates the inner stopper 3 to open the container 2.
It also communicates with the atmosphere through the boiling detection section 6.

7 is a DC motor provided at the bottom between the exterior main body 1 and the container 2. Reference numeral 8 denotes a centrifugal pump driven by a DC motor 7 , and a suction port 9 of this pump 8 communicates with the center of the bottom of the container 2 . 10 is a discharge port of the pump 8, and hot water is pumped upward from this discharge port 10 via a discharge pipe 11, and is poured from a discharge port 12 into a cup or the like.
Reference numeral 13 denotes a heater provided outside the bottom of the container 2, and as shown in FIG. 2, this heater 13 is composed of a heating heater 14 and a heat-retaining heater 15.

Reference numeral 16 denotes a switching start switch that drives the DC motor 7 to start the pump 8, and is operated via a rod 18 when a push button 17 is pressed. Reference numeral 19 denotes a compression type spring, and this spring 19 always urges the rod 18 upward.

20 is a temperature switch that controls the heater 14 when the temperature of the water in the container 2 reaches a predetermined temperature; 21 is a heat-retaining switch that keeps the water temperature in the container 2 at a constant temperature; It is attached to the side wall of the container 2.

As shown in FIG. It is connected to the power supply 22, and on the other hand, the heat retention heater 15
The other end is connected to a heat retention switch 21 and a power source for the DC motor 7 via a changeover start switch 16, and is connected to a commercial power source 22. 23 is a rectifier circuit for direct current.

In the water heater configured as described above, when hot water is to be supplied, when the push button 17 is pushed down, the rod 18 is pushed down, the switching start switch 16 is switched to the DC motor 7 side, and the DC motor 7 is energized. . As a result, the pump 8 rotates and the hot water in the container 2 is discharged from the discharge port 12. When the user releases the push button 17, the push button 17 is pushed back by the spring 19. As a result, the changeover start switch 16 is switched to the side that connects the heat retention heater 15 and the heat retention switch 21.

To discharge hot water in this way, press push button 17.
By pressing the switch 16 to switch the start switch 16, the heat-retaining heater 15 becomes a voltage drop resistor, so that the DC motor 7 can be driven as a low-voltage DC motor.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when the pump is started by the changeover start switch, the insulation heater is connected in series with the DC motor. The motor can be small with low voltage,
As a result, there is no need for any other transformer or resistor for voltage drop, making it possible to obtain a water heater that is small and inexpensive as a whole.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a water heater showing an embodiment of the present invention, and FIG. 2 is a circuit diagram thereof. 2... Container, 7... DC motor, 8... Pump, 15... Warming heater, 16... Changeover start switch.

Claims (1)

[Claims] 1. A container for storing hot water, a pump using a DC motor to discharge the hot water in the container, a heater for heating the hot water in the container and a heater for keeping it warm, and a heater for keeping hot water and the DC motor when starting the pump. A hot water supply system consisting of a changeover start switch in a heat insulation circuit connected in series.