JPS6011374Y2 - Antifreeze device for water heater - Google Patents

Description

[Detailed description of the invention] This invention is a water heater antifreeze device that automatically energizes the heating element when the temperature of the appliance reaches the freezing temperature, and this heating element heats the appliance and freezes it. The purpose is to prevent this.

In general water heaters, a manually operated water drain valve is installed in the water passageway, and in severe cold weather, this water drain valve is operated to drain the water inside the appliance to prevent damage to the appliance due to freezing of water.

As a result, equipment was often damaged due to forgetting to operate the water drain valve, and this was not a very desirable method.

The present invention has been devised in view of the above points, and embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a water heater main body, which mainly includes a water passage 4 having a hydraulic response device 2 and a heat exchanger 3 in the middle, a burner 5 provided below the heat exchanger 4, and supplying fuel to this burner. The valve 7 is configured to control the opening and closing of the fuel passage 6 in conjunction with the hydraulic response device 2.

Reference numeral 8 denotes a control circuit which controls the opening and closing of a solenoid valve 10 provided upstream of valve 7 in the fuel passage 6 and a plug 11 attached to the burner 5 by the operation of a microswitch 9 provided in conjunction with the valve 7. It is operated using commercial power.

Reference numeral 12 denotes a freeze prevention device fixed to the hydraulic response device 2, which includes a mounting plate 15 fixed to the wall 13 of the hydraulic response device 2 with screws 14 for good heat conduction, and a thermistor fixed to this mounting plate for good heat conduction. A heating element 16 such as the above, a cover 17 surrounding the heating element, and a thermal reed switch electrically connected in series to the heating element 16 and fixed to the cover 17 with a band 18 (opens and closes depending on temperature changes). 19, and the heating element 16 is supplied with electric power via the control circuit 8.

The thermal reed switch 19 has a contact point 21 and a ferrite magnet 22 disposed at appropriate locations inside the glass tube 20, as shown in FIG.
The contact point 21 is opened and closed at a set temperature by utilizing changes in the magnetic force of the ferrite magnet 22 depending on the temperature.

When the control circuit 8 is connected to a commercial power source and water is supplied to the water passageway 4, the hydraulic response device 2 is activated and the valve 7 is opened, thereby the microswitch 9 is activated and the control circuit 8 is activated. The plug 11 is caused to discharge, and the solenoid valve 10 is opened to supply gas fuel to the burner 5 through the fuel flow path 6.

Therefore, the burner 5 is supplied with fuel and is ignited by the discharge of the plug 11 to start combustion, thereby heating the heat exchanger 3 and obtaining hot water from the downstream of the passageway 4.

Incidentally, the discharge of the plug 11 may be stopped by providing a timer circuit or the like in the control circuit 8 after the burner 5 is ignited or after a certain period of time from the start of discharge.

When the water supply to the water flow path 4 is stopped, the hydraulic response device 2 is activated to close the valve 7, the microswitch 9 is activated, and the control circuit 8 is activated to close the electromagnetic valve 10 and allow the fuel flow path 6 to flow. Stop the fuel supply.

On the other hand, when the temperature drops to a temperature at which water can freeze, such as during severe cold weather, the thermal reed switch 19 is activated, closes its contact 21, and the heating element 16 is energized.

Then, the heating element 16 generates heat and heats the hydraulic response device 2 via the mounting plate 15.

Further, when the temperature of the cover 17 rises due to the heat generated by the heating element 16, the thermal reed switch 19 is activated and the contact 21 is activated.
is opened to stop the power supply to the heating element 16 and prevent the temperature from rising more than necessary.

Thereafter, by repeating the above-mentioned operations, the hydraulic response device 2 is kept warm and the water is prevented from freezing.

The installation of the thermal reed switch 19 is not limited to the cover 17, but may be mounted on the main body of the water pressure response device 2 around the heating element 16. In this case, the heat of the heating element 16 is sensed with a time lag. It is preferable to

As mentioned above, the anti-freeze device for water heaters according to the present invention includes a heating element such as a thermistor that is fixed to the outer wall of the water heater passageway directly or through a mounting plate to ensure good heat conduction, and a space around the heating element. It is equipped with a thermal reed switch that detects the ambient temperature and controls the power supply to the heating element.The combination of the heating element and the thermal reed switch allows
When the water passageway of the appliance drops below the set temperature, the heating element automatically generates heat to keep the passageway warm, thereby preventing damage to the appliance due to water freezing.

Therefore, by attaching this device to a location where equipment is likely to be damaged due to freezing of water, damage to that part can be prevented.

Furthermore, since the device is very simple, it can be easily attached to conventional instruments, and it can also prevent freezing due to forgetting to operate the device.

In addition, a thermal reed switch is installed around the heating element, so when the ambient temperature rises due to heat generation from the heating element, the thermal reed switch is activated and stops the power supply to the heating element, thereby preventing excessive temperature rise. It is economical and has high practical value.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a water heater equipped with an anti-freeze device according to the present invention, FIG. 2 is a perspective view of the main part, and FIG. 3 is a cross-sectional view of the main part. 2...Hydraulic response device, 4...Water passage,
15...Mounting plate, 16...Heating element, 1
9...Thermal reed switch.

Claims (1)

[Scope of utility model registration request] A heating element such as a thermistor is fixed directly to the outer wall of the water heater water passageway or through a mounting plate to ensure good heat conduction, and is installed around the heating element to detect the ambient temperature and supply power to the heating element. Antifreeze device for water heaters controlled by thermal reed switches.