JPH0446345B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a startup control device that performs specific control when starting a heat pump water heater.

Conventional technology A system using a heat pump that has a hot water storage tank, circulates the water in the hot water tank using a city water pump, boils it with a forced convection hot water heating heat exchanger, and stores heat in the hot water storage tank. For example, it is shown in Japanese Patent Application Laid-open No. 122231/1983. During normal operation, the compressor is operated, the high-pressure gas refrigerant gives heat to city water in the hot water heating heat exchanger (condenser), and the refrigerant that has become a high-pressure liquid is depressurized in the pressure reducer.The outdoor fan is operated. The evaporator receives heat from the atmosphere, becomes a low-pressure gas refrigerant, and returns to the compressor. In this way, during the heat pump hot water supply operation, both the city water pump and the outdoor fan are operating, and these have been operating since the start of the heat pump hot water supply operation.

Problems to be Solved by the Invention However, with this kind of control in which the outdoor fan and city water pump are operated uniformly at the start of the heat pump hot water supply operation in the same manner as during normal operation, there are the following problems.

In summer, when the city water temperature is high at about 30 degrees Celsius, and the outside temperature is also high, when the city water pump is started, city water at about 30 degrees Celsius is circulated through the hot water heating heat exchanger. In addition, because the outside air is high, the low pressure (evaporation pressure) of the heat pump is also high in the evaporator where the outdoor fan is operating, and due to these two reasons, the high pressure (condensation pressure) immediately increases to about 25 kg / cm ² G
There were cases in which the temperature rose sharply beyond the limit, posing a danger to the refrigeration cycle.

In view of the above-mentioned problems, the present invention provides a start control device for a heat pump type water heater that prevents the high pressure from rapidly rising to a high level even when the heat pump hot water supply operation is started in the summer when the outside temperature is high and the city water temperature is high. It is something.

Means for Solving the Problems In order to solve the above-mentioned problems, the start control device for a heat pump water heater of the present invention provides a start control device for a heat pump water heater that stops the operation of the outdoor fan and stops the operation of the hot water heating heat exchanger. The control device is equipped with a control device that controls the start of a city water pump that pumps water; a first comparing means for comparing the set temperature A with the outside temperature detected by the outside temperature detecting means; an operation start means for starting the heat pump hot water supply operation; a time counting means for counting the elapsed time; and a set time K is stored. a set time storage means, a second comparison means for comparing the set time K and the time counted by the time counting means, and a mode storage means for storing modes for operating the city water pump and stopping the operation of the outdoor fan. , said first
determining the condition of the outside air temperature from the signal of the comparison means, determining the time to start operation from the signal of the operation starting means, and operating the time counting means based on the input of the signal and the condition of the outside temperature; (2) determining means for determining the elapsed time after the start of operation based on the signal from the comparing means and selecting one of the three modes stored in the mode storage means; and determining the operation of the city water pump and the outdoor fan based on the signal from the determining means. and an output means for outputting an operation stop signal, and immediately operates the city water pump when the heat pump hot water supply operation starts, and when the outside temperature is A.
As described above, when the elapsed time after the start of the heat pump hot water supply operation is less than K, the outdoor fan is stopped, and when the elapsed time reaches K, the outdoor fan is operated.

Effects The present invention has the above configuration, so that even when the outside temperature is high in summer and the city water temperature is high (approximately 30°C), when the heat pump hot water supply operation is started, the city water pump is immediately operated, and the heat pump After the hot water supply operation starts, the outdoor fan is stopped for a predetermined period of time to keep the evaporation pressure low, and then the outdoor fan is operated to shift to normal operation. As a result, even when the heat pump hot water supply operation is started when both the outside air temperature and the city water temperature are high, the high pressure does not suddenly rise above the allowable value, and the operation can be shifted to normal operation.

Embodiments Hereinafter, a starting control device for a heat pump water heater according to the present invention will be described with reference to the drawings.

FIG. 2 shows an example of a heat pump water heater equipped with the startup control device of the present invention. In FIG. 2, 11 is a compressor, 12 is an outdoor heat exchanger (evaporator), 13 is a hot water heating heat exchanger, 14 is a pressure reducer, 15 is an outdoor fan, 16 is a fan motor, 1
7 is a pressure sensor, 18 is a city water pump, and 19 is a hot water storage tank, which are connected in sequence to form a heat pump water heater. Here, 21 is an outside temperature sensor,
22 is a hot water supply operation start switch, and 32 is a start control device. The pressure sensor 17 is provided on the discharge side of the compressor 11 to detect the high pressure of the refrigerant, and the outside temperature sensor 21 used as the outside temperature detection means 1 is provided on the upwind side of the outdoor heat exchanger 12.

The direction of the solid line arrow in the figure indicates the flow direction of the refrigerant in the heat pump hot water supply operation, and the direction of the dashed-dotted line arrow indicates the circulation direction of city water. The high-pressure refrigerant gas that has exited the compressor 11 is passed through the hot water heating heat exchanger 1, which is a condenser.
3 and gives heat to the water sent from the hot water storage tank 19 by the city water pump 18. Then, it becomes a high-pressure refrigerant liquid, is depressurized by a pressure reducer 14, becomes a low-pressure refrigerant, absorbs heat from the outside air in an outdoor heat exchanger 12, which is an evaporator, becomes a low-pressure refrigerant gas, and returns to the compressor 11.
On the other hand, in the city water circulation circuit, the water in the hot water tank 19 is circulated by the city water pump 18, receives heat from the hot water heating heat exchanger 13, and returns to the hot water tank as hot water. If the operation switch 22 is turned on in the summer when the outside temperature measured by the outside temperature sensor 21 is above A, the start control device 32 determines the timing for starting operation of the city water pump 18 and stopping the outdoor fan 15 when the heat pump starts hot water supply. Control the timing of starting operation.

Next, the configuration of the starting control device 32 will be explained with reference to FIG.

24 is a first comparison circuit which inputs the outside temperature detection signal from the outside temperature sensor 21 and compares it with the set value A of the set outside temperature storage circuit 23; and 22 is a hot water supply operation switch. 27 inputs the elapsed time after the start of operation counted by the timer 25, and inputs the set time memory circuit 26.
A second comparison circuit 28 is a mode storage circuit that stores three modes of operating the city water pump and stopping the operation of the outdoor fan. 29 indicates the status of the outside temperature, the timing of starting the hot water supply operation, and the status of the elapsed time after the start of operation from the signals S _Q , S _P , and S _T from the first comparison circuit 24, the hot water supply operation switch 22, and the second comparison circuit 27. This is a judgment circuit that determines the operation start signal.
Timer 25 depending on the situation of S _P and outside temperature signal S _Q.
It also has a function of operating the mode storage circuit 28, and comprehensively judges each signal and selects the mode storage contents of the mode storage circuit 28. 30 is a signal from the determination circuit 29 that controls the outdoor fan motor 16 and the city water pump 17.
This is an output circuit that switches whether the operation of the motor is stopped or not. Here, the set outside temperature storage circuit 23, the first comparison circuit 2
4, set time storage circuit 26, second comparison circuit 27,
The mode storage circuit 28 and the determination circuit 29 collectively constitute an arithmetic control section 31, which may be constituted by a so-called microcomputer. Further, it is assumed that the timer 25 is cleared when the elapsed time reaches K.

Here, the outside temperature sensor 21 is connected to the outside temperature detection means 1.
, the hot water supply operation switch 22 is connected to the operation start means 2,
The set outside temperature storage circuit 23 is the set outside temperature storage means 3.
The first comparison circuit 24 is connected to the first comparison means 4, the timer 25 is connected to the time counting means 5, the set time storage circuit 26 is connected to the set time storage means 6, and the second comparison circuit 27 is connected to the set time storage means 6.
is transmitted to the second comparison means 7, the mode storage circuit 28 is transmitted to the mode storage means 8, the determination circuit 29 is transmitted to the determination means 9,
The output circuits 30 correspond to the output means 10, respectively.

FIG. 4 is a flowchart illustrating in detail the operation of the starting control device shown in FIG.

The operation of the start control device for the heat pump water heater shown in FIG. 2 will be described below with reference to FIGS. 3 and 4.

In the summer, when the hot water supply operation switch 22 is turned on,
The city water pump 17 is immediately operated, the outside temperature sensor 21 detects the outside temperature, and the set outside temperature storage circuit 23
The first comparing circuit 24 compares the set value A≈25° C. and if the value is higher, the timer 25 is started. When the outside temperature is less than A, the outdoor fan 15 is operated immediately. In this way, the timer 25 detects the elapsed time after the start of hot water supply operation, and the second comparison circuit compares the elapsed time with the set value K of the set time storage circuit, and if K has not been reached, the outdoor fan 15 continues to be stopped. When the elapsed time reaches K, the timer 25 is cleared and the outdoor fan 15 is operated to shift to normal hot water supply operation. However, the operation timing of the city water pump 17 and the stop and operation of the outdoor fan 15 are determined by the signals S _Q , S _P , and S _T of the first comparison circuit 24 , the hot water supply operation switch 22 , and the second comparison circuit 27 . After making a comprehensive judgment, a mode is selected from the mode storage circuit 28 and an output signal is output from the output circuit 30.

By controlling as described above, even when the outside temperature is high in summer and the city water temperature is high (approximately 30℃),
Immediately after the hot water supply operation starts, the city water pump 17 is operated to quickly circulate water, which is a heat absorber, to the hot water supply heating heat exchanger 13 to suppress high pressure. By stopping the evaporation pressure, the evaporation pressure is kept low, and as a result, high pressure is suppressed. As a result, when starting the heat pump hot water supply operation in the summer when both the outside air temperature and the city water temperature are high, the city water pump 17 and the outdoor fan 1 can be operated without the high pressure rising rapidly beyond the allowable value.
5 can be shifted to normal operation. However, in the winter and intermediate seasons when the outside temperature is lower than the set value A, there is no need to use the control to stop the outdoor fan 15 for a predetermined period of time when it is started.

In the embodiment, a heat pump water heater equipped with a hot water storage tank 19 has been described, but even when there is no hot water storage tank, the same operating method as described above may be used.

Effects of the Invention The start control device for a heat pump type water heater of the present invention described above can control the operation timing of the city water pump and the outdoor temperature even when the outside temperature is high in summer and the city water temperature is high. By stopping the fan and switching its operation, the high pressure can be suppressed at the time of startup, and a phenomenon in which the high pressure suddenly rises above the allowable value at the time of startup can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a complaint response diagram showing the control device for the heat pump type water heater of the present invention as a function realizing means;
Fig. 2 is a block diagram showing an embodiment of a heat pump type water heater equipped with the same control device, Fig. 3 is a block diagram of a control device of a heat pump type water heater which is an embodiment of the present invention, and Fig. 4 is a block diagram showing an embodiment of a heat pump type water heater equipped with the same control device. This is a flowchart illustrating the operation of the control device in detail. 21...Outside temperature sensor, 22...Hot water supply operation switch, 23...Setting outside temperature storage circuit, 24...First comparison circuit, 25...Timer, 26...Setting time storage circuit, 27...Second comparison Circuit, 28...Mode storage circuit, 29...Determination circuit, 30...Output circuit, 31...Arithmetic control section, 32...Start control device.

Claims (1)

[Claims] 1 Compressor, outdoor heat exchanger, hot water heating heat exchanger,
A refrigeration cycle is configured from a pressure reducer, and the heat pump type water heater supplies hot water using the hot water heating heat exchanger, and controls the operation stoppage of an outdoor fan and the start of a city water pump that sends city water to the hot water heating heat exchanger. The control device is equipped with an outside temperature detection means for detecting the outside temperature, a set outside temperature storage means for storing a set temperature A of the outside temperature, and a set temperature A and the outside temperature detecting means. a first comparison means for comparing detected outside temperatures; an operation start means for starting a heat pump hot water supply operation; a time counting means for counting elapsed time; a set time storage means for storing a set time K; and a set time K. a second comparison means for comparing the time counted by the time counting means; a mode storage means for storing modes for operating the city water pump and stopping the operation of the outdoor fan; Determining the temperature situation, determining the time to start operation based on the signal from the operation starting means, and operating the time counting means based on the input of the signal and the outside temperature condition, and using the signal from the second comparing means. determining means for determining the state of elapsed time after the start of operation and selecting one of the three modes stored in the mode storage means; and an output for outputting operation of the city water pump and stoppage of operation of the outdoor fan based on a signal from the determining means. and means for immediately operating the city water pump when the heat pump hot water supply operation is started, and when the outside temperature is A or more, the elapsed time after the heat pump hot water supply operation is started is K.
A start control device for a heat pump water heater that stops the outdoor fan when the elapsed time is less than K, and operates the outdoor fan when the elapsed time reaches K.