JPS59215559A - Controller for overload of heating of air-cooled heat pump type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an overload control device during heating in an air-cooled heat pump type air conditioner.

Conventional configurations and their problems In general, in so-called air-cooled heat pump air conditioners in which the outdoor heat exchanger is air-cooled, when heating operation is performed when the outside temperature is high, the evaporation capacity of the outdoor heat exchanger increases and indoor heat exchange is interrupted. Due to an imbalance with the condensing capacity in the vessel, problems occur such as the high pressure becomes too high, the discharge temperature becomes too high, and the current input becomes too high. In order to eliminate this, a high-pressure pressure regulating valve is used,
When the discharge pressure becomes higher than a predetermined pressure, the high-pressure pressure regulating valve is opened and the refrigerant is bypassed to the low-pressure side to adjust the discharge pressure, or the outdoor heat exchanger is used for outdoor delivery. Countermeasures have been taken to reduce the evaporation capacity by starting and stopping (hereinafter referred to as starting and stopping).However, these methods do not work because the evaporation capacity of the outdoor heat exchanger fluctuates greatly. This method has drawbacks such as unnecessary defrosting, a heavy burden on the compressor, and an expensive high-pressure regulating valve.

OBJECTS OF THE INVENTION The present invention overcomes the above-mentioned drawbacks of the prior art and avoids the use of expensive components such as high pressure regulating valves. In addition, the purpose is to prevent unnecessary defrosting from occurring due to an extreme lack of evaporation capacity when the outdoor fan starts or stops (on the contrary, when it stops, the evaporation capacity becomes insufficient). .

Structure of the Invention The present invention provides a pressure sensor in the compressor discharge station, and uses the signal from the pressure sensor to control the voltage applied to the outdoor blower by a control circuit, thereby linearly controlling the outdoor blower. Then, the rotation speed of the outdoor blower is controlled according to the outside temperature to adjust the pressure in the reagent circuit.

DESCRIPTION OF EMBODIMENTS An embodiment according to the present invention will be described based on FIGS. 1 and 2. 1 is a compressor, 2 is a four-way valve, 3 is an air-cooled outdoor heat exchanger connected to the four-way valve, 4 is a heating expansion valve connected to the outdoor heat exchanger 3, and 6 is a receiver connected to the heating expansion valve. liquid container, 6
7 is a cooling expansion valve on the indoor unit side connected to the surface side solenoid valve 6; 8 is a heating check valve connected in parallel with the valve; 9 1o is an indoor heat exchanger connected to the cooling expansion valve 7, 1o is a gas-side solenoid valve connected to the indoor heat exchanger 9, and 11 is an accumulator. Reference numeral 12 denotes a detection unit that detects the pressure in the discharge pipe 13 of the compressor 1, which is sensed by a pressure sensor 14. 15 is an l'1ilJ# circuit that operates based on the signal from the pressure sensor 14, and a voltage application circuit 16.
The voltage applied to the outdoor blower 17 for the outdoor heat exchanger 3 is linearly controlled in accordance with the pressure of the discharge pipe 13 through the pressure controller. FIG. 2 shows the relationship between the discharge pipe pressure of the compressor 1 and the voltage applied to the outdoor blower 17. The motor is designed so that the outdoor blower stops at line A, which is the 60% line.

In the above configuration, the voltage applied to the outdoor blower is set as shown in FIG. 2: point a - point b - point 0 - point d = point e - point. Therefore, the outdoor blower 17 operates at the rated voltage during heating and when the discharge pipe pressure is low, and when the outdoor temperature increases, the evaporation capacity in the outdoor heat exchanger 3 increases. The pressure sensor 14 detects this, and the control circuit 16 and voltage application circuit 16 operate. Therefore, the discharge pressure also increases, and from the point 23~/c1iOa, the voltage applied to the outdoor blower begins to decrease and reaches point b. And outdoor ventilation +!
The area between point b and point C, where 17 stops operating, is Defanunzoyal 9. When the discharge pressure decreases to 9/nl at 23, the voltage applied to the outdoor blower begins to rise and approaches point 6, and the rotational speed increases. When the discharge pressure drops to 211 g/aA, the rated voltage is reached again. Furthermore, when the discharge pipe pressure rises, the applied voltage also drops when it reaches point a, which is the value of the differential (2). In this manner, while the outdoor temperature is high, the rotation speed of the outdoor blower 17 is controlled, and by linearly controlling the evaporation capacity, the discharge pressure and temperature are simultaneously controlled.

Effects of the Invention As described above, the present invention provides a pressure sensor in the discharge pipe, inputs a signal from the pressure sensor to a control circuit, and thereby linearly controls the voltage applied to the outdoor blower according to the refrigerant pressure. Therefore, the amount of air blown by the outdoor blower is linearly controlled, the optimum evaporation capacity can be obtained, and it is a good countermeasure against overload. Furthermore, when starting the outdoor blower, the discharge pressure is lower (between point e and point d).
Since the outdoor blower starts faster, the rated voltage is applied to the outdoor blower motor, and no special starting compensation is required.Compared to using a high-pressure pressure regulating valve, the cost is lower and the burden on the compressor is smaller. It has practical effects such as:

[Brief explanation of the drawing]

Fig. 1 is a control system diagram on the refrigerant circuit of an air-cooled heat pump type nitrogen conditioner according to the present invention, and Fig. 2 is a constant diagram of the number of applied voltages in the relationship between the outdoor blower applied voltage and the discharge pipe pressure according to the present invention. . 13...Discharge pipe, 14...Pressure sensor,
16...Control circuit, 16...Outdoor blower voltage application circuit, 1T...Outdoor blower 0

Claims (1)

[Claims] A compressor, a four-way valve, an air-cooled outdoor heat exchanger, and an indoor heat exchanger are connected in a ring, and a pressure sensor is provided in the discharge pipe from the compressor, and the outdoor heat exchanger is operated by the signal of this pressure sensor. A heating overload control device for an air-cooled heat pump air conditioner equipped with a control circuit that linearly controls the voltage applied to the outdoor blower that cools the air.