JPS5820848Y2 - Constant temperature water supply device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a constant temperature hot water supply device.

Conventionally, fixed-temperature hot water has a configuration in which the upper limit temperature when the water is not full is set slightly lower than the upper limit temperature when the water is full, and these two different upper limit temperature settings are detected using thermostats to control water injection and water supply. A feeding device was also used.

However, 1. This fixed-temperature water supply device uses two thermostats with different set temperatures, so it takes time to adjust, and it is difficult to make adjustments without fully understanding the difference in set temperature within the thermostat. There was a problem.

In view of the above, the object of this invention is to provide a constant temperature hot water supply device that is simple in adjustment and structure and easy to handle.

Examples of this invention will be described below.

A hot water inlet 3 is provided on the lower side of the tank 1 to ensure a required minimum water level.

A heater 2 is provided below the hot water inlet 3, and one end of the power supply circuit of the heater 2 serving as a heating device is connected to a switching contact 8 of a thermostat.
It is connected to the U terminal via 2, and the other end is connected to the ■ terminal.

The U terminal is connected to a float switch 6 and a thermostat 8, and the float switch 6 is connected to the ■ terminal via a relay 9.

One normally open contact 91 of the relay 9 is connected in series to the power supply circuit of the water supply device 7, and the other normally open contact 92 is connected in parallel to the switching contact 82 of the thermostat.

Further, the other switching contact 81 of the thermostat 8 is connected in series to the power supply circuit of the water supply device 7.

Next, the effect of this idea will be put to practical use.

Since the hot water supply port 3 is located above the bottom of the tank 1, a predetermined minimum amount of water can be stored even if the hot water in the tank 1 is used to the maximum, so that the contacts of the flows 1 to 6 are kept closed.

As soon as voltage is applied to the power source, current flows through the heater through the thermostat l- contacts 82 and heating of the residual water begins.

Then, the water temperature in the tank 1 is gradually increased.

Further, since the relay 9 is energized by the applied voltage, the contacts 91 and 92 are closed.

When the temperature of the water in the tank 1 reaches the set temperature of the thermostat and the temperature sensing part 5 detects the set temperature, the contact 82 to the contact 8
], the water supply device 7 is operated, and water is poured.

At this time, the contact 92 is closed by the operation of the relay 9, so the heater 2 continues heating.

By pouring water, the liquid level rises from the lowest water level A, and the temperature of the hot water in the tank decreases.

Therefore, when the water temperature falls below the set temperature, the thermostat is operated to switch the contact from 81 to 82, stopping the operation of the water supply device 7 and stopping water injection.

Then, the above operation is repeated until the full water level B is reached.

When the tank 1 becomes full of water, the float 4 is located at the upper limit, so the contact of the float switch 6 is opened.

Therefore, when the water is full, relay 9 is not energized and contacts 91.
92 opens together.

Therefore, the water supply device 7 does not operate and water is not supplied.

However, when the switching contacts 81 and 82 of the thermostat are turned on,
When the heater is turned off, the heating control of the heater is performed, so the water temperature is maintained at the set temperature.

Therefore, the hot water in the tank 1 is used from the hot water supply port 3,
When the water level drops, the float switch contacts close.
The above operations are repeated.

Therefore, hot water at a constant temperature is supplied.

Since this invention has the above configuration, a single thermostat with one switching contact supplies hot water at a constant temperature, so there is no need to install two thermostats with different set temperatures as in the past. It is not necessary to adjust the difference in the set temperature between the two, and there are excellent effects such as easy adjustment and a simple structure.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of this invention.

Claims (1)

[Scope of utility model registration request] a tank 1 having a hot water supply port 3 for maintaining a minimum water level on the outside;
A heating device 2 installed in the tank 1 at a position lower than the hot water supply port 3, and a water supply/heating switch having a temperature sensing section 5 near the heating device 2 and interlocking with the temperature sensing section 5 outside the tank 1. one thermostat with contacts, a float switch 6 that opens and closes in response to a float installed in the tank 1, and a relay 9 that is activated by the float switch;
a water supply device 7, the switching contact of the thermostat is connected to the power supply circuit of the water supply device 7 and the power supply circuit of the heating device 2, and one normally open contact of the relay 9 is connected to the power supply circuit of the water supply device 7. A constant temperature hot water supply device characterized in that the other normally open contact is connected in parallel to the switching contact connected to the power supply circuit side of the heating device 2.