JPS5912249A - Operation controlling method of heat-pump heat- accumulating type hot water supply device - Google Patents

Abstract

PURPOSE:To prevent water from freezing in a pipe after stopping a heat-accumulating operation, by forcibly operating a circulating pump at predetermined time intervals in a low temperature condition. CONSTITUTION:A heat accumulation thermostat 10a, a timer 12a and a thermostat 14a having a contact closed when the outside air temperature is low are provided in an electric circuit for the titled hot water supply device comprised of a heat-accumulating tank 6 (which accumulate heat in the form of hot water obtained by a system comprised of a compressor 1, an air heat exchanger 2, a pressure reducer 3, a two-way change-over valve 4 and a water refrigerant heat exchanger 5), the circulating pump 7, a water pipe 8 and a heat accumulation thermostat 10. When water temperature is not higher than a preset temperature, the compressor 1 and the circulating pump 7 are operated through contacts 11b-11d of a relay coil 11a, and a contact 12b of a timer 12a is closed and opened at predetermined time intervals. When the outside air temperature becomes not higher than a set temperature of the thermostat 14a and not lower than a set temperature of the thermostat 10, the pump 7 is forcibly operated at predetermined time intervals.

Description

[Detailed description of the invention] The present invention relates to operation control of a heat pump thermal storage water heater,
In particular, the present invention relates to operation control suitable for preventing water from freezing in piping.

A general heat pump heat storage water heater consists of a compressor (1), an air heat exchanger (2), a pressure reducer (,3), and a two-way switching valve (4).
, a blower (9), and a water-refrigerant heat exchanger (5).The water-refrigerant heat exchanger generates hot water, and by operating the circulation pump (7), the hot water is transferred to the heat storage tank (6). It is something to send. However, since the water piping is affected by the outside temperature, there is a drawback that the water in the piping freezes when the heat storage thermostat breaks down and the operation is stopped.

The present invention was made to improve the above drawbacks, and
To provide an operation control capable of preventing water in pipes from freezing after stopping heat storage operation in cold weather.

Water in piping that is stationary in a fixed location is affected by the outside temperature and freezes during cold weather. Therefore, after the heat storage operation is stopped, the water becomes still and freezes. Therefore, by operating a circulation pump, water can be circulated to prevent freezing.

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In Figure 1, 1 is a compressor, 2 is an air heat exchanger, 3 is a pressure reducing device, 4 is a two-way switching valve, 5 is a water refrigerant heat exchanger, 6 is a heat storage tank, 7 is a circulation pump, 8 is a water pipe. In the system configured as described above, hot water generated in the water-refrigerant heat exchanger 5 is sent to the heat storage tank 6 by a circulation pump. 9
is a heat storage thermostat that turns off when the tank is filled with hot water. In Figure 2, 10a is the contact point of the heat storage thermostat, and if the water temperature is below the set temperature, 10a is the contact point of the heat storage thermostat.
The compressor 1 and circulation pump 7 are operated through the relay coil 11b and 1IC1lid of a. 12a
The contact 12b is turned on and off at regular intervals using a timer. Further, 14a is a thermostat whose contact is turned on when the outside air temperature is low, and forcibly operates the circulation pump 7 at regular intervals when the outside air temperature falls below the set temperature of the thermostat and the heat storage thermostat 10 rises above the set temperature. The idea is to let it happen. Through the above control, the heat storage tank 6 is filled with hot water, and after the temperature becomes higher than the set temperature of the heat storage thermostat 10 and the compressor 1 and the circulation pump 7 stop operating, the circulation pump 7 is heated at regular intervals when the outside air temperature is low. By forcibly operating the water pipe 8, it is possible to prevent the water in the water pipe 8 from freezing.

As described above, according to the present invention, in a heat pump heat storage water heater, after the heat storage tank is filled with hot water and the compressor and circulation pump are stopped, the circulation pump is forcibly turned on at regular intervals when the outside temperature is low. Since it can be operated, it has the effect of preventing the water in the pipes from freezing during cold weather.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a refrigeration cycle and a water cycle showing an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of operation control showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Air heat exchanger, 3... Pressure reduction device, 4... Three-way switching valve, 5... Water refrigerant heat exchanger,
6... Heat storage tank, 7... Circulation pump, 8... Water piping, 9... Air blower, 10... Heat storage thermostat, lla... The important part of the thermostat drives the compressor and circulation pump. Relay coil (llb, IIC, ll
d is the contact point), 12a...A timer that temporally controls the circulation pump, 13a...Defrost thermometer, 14
...A thermostat that contacts when the outside temperature is low.

Claims (1)

[Claims] Compressor (1), air heat exchanger (2), pressure reduction device (3),
Thermal storage tank (
6) In a heat pump thermal storage water heater consisting of a circulation pump (7), water piping (8), and thermal storage thermostat (10), in order to prevent the water in the water piping from freezing, it is necessary to Operation control of a heat pump heat storage water heater characterized by forced operation of a circulation pump.