JPS60114669A - 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 [Technical Field of the Invention] The present invention relates to a heat pump type air conditioner equipped with a variable capacity compressor.

[Technical background of the invention and its problems]

Generally, in an air conditioner equipped with a variable capacity compressor, the best energy saving effect can be obtained if the power consumption of the compressor can be lowered when the compressor is operated at low capacity. However, when the compressor is operated at low capacity, the refrigeration cycle becomes overfilled with refrigerant, so the current consumption of the compressor does not actually decrease much. In other words, the current consumption of the compressor is influenced by the state of the refrigeration cycle, for example, the amount of refrigerant, and even if the amount of refrigerant is controlled using an expansion valve etc. in response to changes in compressor capacity, the amount of refrigerant during low capacity operation It was not possible to eliminate the excess. On the contrary, the current situation is that the amount of heat exchanged by the evaporator decreases, resulting in a decrease in heating capacity.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to reduce the current consumption of the compressor when the compressor is operating at low capacity, thereby achieving maximum energy savings. Our goal is to provide an excellent air conditioner that can provide you with the best possible results.

[Summary of the invention]

This invention provides a refrigerant amount adjustment tank in a refrigeration cycle, and stores refrigerant in the refrigerant fog adjustment tank during low capacity operation of a variable capacity compressor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a variable capacity compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducing device such as a gear pillar tube 4, an indoor heat exchanger 5, etc. are connected in sequence to form a heat pump type refrigeration cycle. configured. That is, during cooling operation, the refrigerant flows in the direction of the solid line arrow shown in the figure, forming a cooling cycle, and during heating operation, the four-way valve 2 is switched, so that the refrigerant flows in the direction of the broken line arrow, forming a heating cycle. Ru. Therefore, between the mutual communication part of the outdoor heat exchanger 3 and the capillary tube 4 and the mutual communication part of the indoor heat exchanger 5 and the four-way valve 2, an electromagnetic on-off valve 6.7 is provided for adjusting the amount of refrigerant. The tank 8 is also used as a hot gas bypass cycle for defrosting the continuous outside heat exchanger 3.

A humidity detector 9 is attached to the outdoor heat exchanger 3 , and the output of the humidity detector 9 is supplied to the main controller 10 . This main control section 10 drives an inverter circuit 12 according to the load, that is, the temperature detected by the indoor temperature detector 11, thereby controlling the capacity of the compression m1, and also controls the electromagnetic circuit according to the temperature detected by the humidity detector 9. It controls the opening and closing of the on-off valves 6.7.

Next, the operation of the above-described configuration will be explained with reference to the flowchart shown in FIG.

Now, when heating operation is set, the indoor temperature is set, and an operation start operation is performed, the operation of the compressor 1 is started and the four-way valve 2 is switched.

In this way, a heating cycle is formed and the indoor heat exchanger 5
acts as a condenser, and the outdoor heat exchanger 3 acts as an evaporator, and heating operation is started. At this time, the main control unit 10 compares the indoor temperature detected by the indoor temperature detector 11 and the set indoor temperature, and determines the frequency and voltage of the output of the inverter circuit 12 according to the comparison result. Therefore, the compressor 1 is operated at the optimum capacity corresponding to the magnitude of the load.

By the way, when the compressor 1 is operated at a low capacity, the main control unit 10 determines that if the evaporation temperature detected by the temperature detector 9 is relatively high (above the set value), that is, there is an excessive amount of refrigerant and the temperature is outside the room. Heat exchanger 3 is frozen. In addition, when the compressor 1 is no longer operating at low capacity, if the evaporation temperature is relatively high and the refrigerant is in excess when the compressor 1 is operating at low capacity,
By reducing the amount of refrigerant circulating in the refrigeration cycle to eliminate excess refrigerant, the power consumption of the compressor 1 can be significantly lowered compared to the conventional system (indicated by the broken line in the figure), as shown in Figure 3.
Furthermore, the amount of heat exchanged by the outdoor heat exchanger 3 is increased, the heating capacity can be improved, and the highest energy saving effect can be obtained. Furthermore, since the cycle of the refrigerant amount adjustment tank 8 is also used as the hot gas bypass cycle, the number of parts can be reduced and an increase in cost can be suppressed.

In the above embodiment, a temperature detector 9 for detecting the evaporation temperature is provided, and refrigerant is accommodated when the compressor 1 is operating at low capacity and the evaporation temperature is higher than the set value. A pressure detector may be provided in place of 9, and refrigerant may be stored when the compressor 1 is operating at low capacity and the evaporation pressure is above a set value. In some refrigeration cycles, the temperature of the refrigerant discharged from the compressor decreases when there is an excess of refrigerant. A cycle for setting the discharge refrigerant temperature of the compressor 1 to a set value may be provided in parallel with the capillary tube 4.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the current consumption of the compressor when the compressor is operated at low capacity, thereby providing an excellent air conditioner that can obtain the highest energy saving effect. can.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is an overall configuration diagram, Fig. 2 is a flowchart for explaining the operation, and Fig. 3 is a comparison of the power consumption of the compressor with a conventional one. The figure shown in FIG. 4 is a configuration diagram of a modified example. 1... variable capacity compressor, 2... four-way valve, 3... outdoor heat exchanger, 5... blank side heat exchanger, 8... cold t
s amount adjustment tank, 10...main control unit, 12...inverter circuit. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (5)

[Claims] (1) Equipped with a heat pump type refrigeration cycle consisting of a variable capacity compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an all-inside heat exchanger, etc. connected in sequence, and the capacity of the compressor is controlled according to the load. The air conditioner is equipped with a refrigerant amount adjusting tank provided in the refrigeration cycle, and a control means for storing refrigerant of the refrigeration cycle in the refrigerant amount adjusting tank when the compressor is operating at low capacity. An air conditioner featuring: (2) The air conditioner according to claim 1, wherein the control means causes the refrigerant to be accommodated when the pressure-wiring machine has a low capacity and the evaporation temperature or evaporation pressure in the refrigeration cycle is higher than a set value. Machine. (3) The air conditioner according to claim 1, wherein the control means causes the compressor to contain the refrigerant when the capacity is low and the temperature of the refrigerant discharged from the compressor is below a set value. (4) The air conditioner according to claim 1, 82, or 3, wherein the refrigeration cycle has a hot gas bypass cycle for defrosting. (5) Claim 4, characterized in that the refrigerant amount adjustment tank is provided in a hot gas bypass cycle.
Air conditioner as described in section.