JPS6112523Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a freeze prevention device for a hot water circulation heating device.

(Prior art) Conventionally, when dealing with loads such as outdoors, for example, a heat source equipment installed at a remote location from a bathtub or a radiator is connected to the load to form a circulation path, and a pump installed in the circulation path is used to pump water from the bathtub. In a hot water circulation heating device that heats by forced circulation, for example,
As shown in Publication No. 38415, in order to prevent the accumulated water in the circulation path from freezing due to the drop in outside temperature in winter, the outside temperature is detected by a temperature sensor, and if the outside temperature drops by a certain temperature, the pump is activated. The vehicle was operated to prevent it from freezing.

(Problem that the invention aims to solve) However, in the conventional example, there is a difference between the temperature at which the pump operates when the outside temperature drops (ON temperature) and the temperature at which the pump stops operating when the outside temperature rises (OFF temperature). (hereinafter referred to as differential), so if the outside temperature drops and the pump is energized, the pump will continue to be energized unless the outside temperature rises to the OFF temperature, and if the differential is large, the pump will continue to be energized. If this happens, the pump will run for an extremely long time.
This adversely affected the durability of the pump and was also contrary to energy conservation.

The present invention aims to solve the problems of the conventional methods described above, improve the durability of the pump, and provide an energy-saving antifreeze device. The configuration of the present invention will be specifically explained.

(Example) Reference numeral 1 denotes a heat source device, in which a heat exchanger 2 and a burner 3 for heating the heat exchanger 2 are provided, and a water pipe 4 leading to the heat exchanger 2 is provided with a pump. Reference numerals 6 and 7 designate connecting fittings for connecting the water pipe 4 and the water pipe 8 from the heat exchanger 2 to pipes 9 and 10, which will be described later, respectively, and are fixed to the bottom of the casing with screws or the like. Reference numeral 11 denotes a heat-conducting mounting plate made of metal or the like fixed to the bottom of the casing with a heat insulating material 12' in between.
A heating element 13 is attached near 2. 14 is a bathtub, and this bathtub 14 is connected to connecting fittings 6 and 7 through pipes 9 and 10, and heat exchanger 2, water pipes 4,
8, piping 9, 10, and bathtub 14 form a circulation path. FIG. 2 shows an electrical circuit diagram of the main part of the present invention, in which a heating element 13 is connected in parallel with the pump 5, and a temperature detector 12 is connected between this parallel circuit and the power source 15.
A switch 7 is provided which is opened and closed by an outside temperature control device 16 which is activated by a signal from the outside air temperature control device 16.

In the above configuration, to heat the water in the bathtub 14, the pump 5 is energized and the gas burner 3 is ignited. When the pump 5 is energized, the water in the bathtub 14 is sent to the heat exchanger 2 via the pipes 9 and 4 and heated, and the heated circulating water is returned to the bathtub 14 via the water pipes 8 and 10, and the above-mentioned circulation is carried out. Heating is performed continuously and the water in the bathtub 14 is heated to the set temperature.

Now, in winter, when the outside temperature is freezing, that is, when the pump
When the outside temperature drops to near the ON temperature, the temperature detector 12 detects this drop in the outside temperature, the outside temperature control device 16 is activated, and the switch 17 is closed. Therefore, the pump 5 is energized and operated to circulate the bath water within the circulation path to prevent freezing within the circulation path. However, when the lever pump is in freezing operation, the heating element 13 is also energized at the same time as the pump 5 is energized, so the heating element 13 gradually generates heat and raises the ambient temperature around the temperature sensor 12, causing the ambient temperature to reach the OFF temperature. If the temperature rises, the outside temperature control circuit 16 stops operating, opens the switch 17, and stops energizing the heating element 13 and pump 5. When the heating element 13 stops generating heat, the ambient temperature gradually decreases, and at this time, if the temperature detected by the temperature sensor 12 drops to the ON temperature again, the same effect as described above will be repeated, and the outside temperature will eventually become a danger of freezing. If the temperature remains the same, the pump 5 is operated intermittently at intervals to prevent freezing.
If the outside temperature rises even slightly, the pump 5 will not operate.

(Effects of the invention) As explained above, the invention connects the load and the heat source equipment with piping to form a circulation path with a pump installed, and detects the outside temperature with a temperature detector to operate the pump. In the case where the operation is controlled, a heating element is provided near the temperature detector that is energized and de-energized at the same time as the pump is energized and de-energized when the pump is operated due to a drop in outside temperature, unlike the conventional example. Even if the outside temperature rises slightly or remains low, the pump will not continue to operate for a long time, improving the durability of the pump, contributing greatly to energy savings, and preventing freezing. is carried out reliably and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is an electrical circuit diagram of the main parts. 1...Heat source device, 5...Pump, 12...Temperature detector, 13...Heating element, 14...Bathtub (load).

Claims (1)

[Scope of utility model registration request] An anti-freeze device for a hot water circulation heating system in which a load and a heat source are connected by piping to form a circulation path with a pump interposed therebetween, and the outside air temperature is detected by a temperature detector to control the operation of the pump, characterized in that a heating element is provided near the temperature detector that is energized and stopped at the same time as the power supply to the pump is turned on and off when the pump is operating due to a drop in the outside air temperature.