JPH01111152A - Air conditioner - Google Patents

Abstract

PURPOSE:To eliminate excessive cooling at the time of a space cooling operation is priority of dehumidification and to reduce uncomfortableness by actuating a controller provided in a freezing cycle only under a specific condition by a selection switch, and rotating a capacity variable type compressor at a rotational speed which is lower than the normal rotational speed. CONSTITUTION:An inverter device 8 is provided at a motor 7 of a capacity variable type compressor 1. At the time of normal operation, Hz is determined by the difference between an indoor temperature sensor 14 and a temperature setter 15, and a current changeover switch 17 is selected to 15A or 10A out of three stages of 15A, 10A and 5A. In a case where the current changeover switch 17 is selected to 5A, the variable width is in a range of 120-20Hz, and a low input operation can be conducted by a specific operation mode of a low rotational speed. In a case where the operation mode is changed over to a dehumidification priority space cooling operation, an indoor fan is rotated at a low speed. When a relation formula Ts-1<=Ta<=Ts+1 is established between a room temperature Ta and a set temperature Ta, the rotational speed of the compressor is set in the vicinity of the lowest rotational speed of the compressor, and the dehumidification is carried out without lowering the room temperature so much. When a relation formula Ta<Ts-1 is established, the power supply is cut off.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an air conditioner.

(Prior art) In variable capacity air conditioners, a variable capacity compressor is built into the refrigeration cycle, but the rotational speed of the variable capacity compressor is determined by the overall efficiency of the air conditioner from the perspective of energy efficiency. (E
ER) is set so as to be lowered only to a level that does not cause significant deterioration.

In other words, in an inverter air conditioner for general household use, the normal operating range is 30Hz, as shown in Figures 6 and 7.
~120Hz, and the minimum operating frequency for cooling operation is 30Hz.
Hz, and when operating under that condition, the cooling load is lighter than this (when the variable capacity compressor repeats on-off operation.The on-ψoff operation of this variable capacity compressor The repetition of is based on the fact that even if there is an operational loss, it is more efficient than operating at a lower frequency.

(Problems to be Solved by the Invention) However, in the variable capacity air conditioner of the above type, there is a limit to the reduction in input depending on the rotation speed range of the variable capacity compressor.
It is difficult to significantly reduce the input to the air conditioner, and the cooling capacity is too large even at low rotational speeds, resulting in too much cooling when the outside air temperature is low.

In other words, when the air conditioner continues to operate at a lower input current when used in conjunction with other electrical equipment (microwave ovens, etc.), or during dehumidification operation at economic temperatures, the minimum rotation speed may be set based solely on efficiency. It was inconvenient.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an air conditioner that can be operated at a lower rotational speed than before according to the user's selection.

[Structure of the invention]

(Means for Solving the Problems) The air conditioner of the present invention includes a refrigeration cycle in which a variable capacity compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are sequentially connected by refrigerant piping. An air conditioner is equipped with a control device that sets the rotation speed of a variable capacity compressor below the normal rotation speed, and a selection switch that operates this control device. The compressor is configured to operate at or below normal rotational speed.

(Function) In the air conditioner of the present invention, the control device provided in the refrigeration cycle is operated only under specific conditions by a selection switch, and thereby the rotation speed of the variable capacity compressor is lower than the normal rotation speed. This prevents the room from being overcooled during cooling operation that prioritizes dehumidification at low loads, or enables operation when the household power supply capacity is insufficient.

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

FIG. 1 shows a refrigeration cycle of an air conditioner according to the present invention, which includes a variable capacity compressor 1, a four-way valve 2, an outdoor heat exchanger 3,
It is constructed by sequentially connecting a pressure reducing device 4 and an indoor heat exchanger 5 with a refrigerant pipe 6, and the motor 7 of the variable capacity compressor 1 is provided with an inverter device 8. The inverter device 8 includes a reactor 9, a rectifier circuit 10, and a switching transistor section 11. An inverter control section 12 connected to this switching transistor section 11 is controlled by a signal from a microcomputer 13. The microcomputer 13 includes a temperature sensor 14 provided in the indoor heat exchanger 5 and a temperature setting device 1.
5. Signals from the operation mode switch 16 and current selection switch 17 are sent. The operation mode switch] 6 is capable of switching between three stages, for example, heating operation, cooling operation, and dehumidification operation. In addition, the current selector switch ]7 is, for example, 15A (normal operation), ], OA, 5
A can be switched in three stages.

Next, the effect will be explained.

During normal operation, the Hz is determined by the difference between the room temperature (temperature sensor 14) and the set temperature (temperature setting device 15), and the current selector switch 17 selects 15A or 10A out of three levels of 15A, 110A, and 5A. Ru. In this case, as shown in Figure 2, the Hz variable range is 120 to 30
Hz, and more efficient operation can be performed in the normal operation mode. When the user selects the current selector switch 17 to be 5A in order to use it in conjunction with other electrical equipment, the variable width of Hz is 120, as shown in FIG.
~20Hz, and the user selects a specific operation mode with a lower rotation speed than the conventional one to perform low input operation, and as shown in Figure 5, even if the input ratio is lowered, the annual air conditioning energy efficiency can be improved. It becomes possible to handle specific driving situations without making things worse.

When the operation mode is switched to dehumidification priority cooling operation, as shown in FIG.
If the relational expression l holds true, Hz=FoSFo=20Hz
By setting the rotation speed of the compressor near the lowest rotation speed for cooling operation, dehumidification can be performed without significantly lowering the room temperature. Further, if the relational expression Ta<Ts-1 is established, the power is turned off.

In addition, when operating in a specific mode, the input reduction effect can be further increased by lowering the rotation speed of the indoor fan or outdoor fan, and the rotation speed of the compressor can also be controlled by a DC type instead of an inverter type.

〔Effect of the invention〕

As described above, according to the present invention, by providing the variable capacity compressor with a specific low rotation mode, it is possible to operate at a significantly low input without significantly reducing the annual air conditioning energy efficiency, and to operate at a low load. It is possible to eliminate overcooling during cooling operation with priority dehumidification when operating the air conditioner, and by significantly reducing the rotation speed of the variable capacity compressor, the temperature difference between the intake air and the blown air is reduced, allowing the user to receive cold or warm air. It reduces the discomfort caused by being hit.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the refrigeration cycle of the air conditioner according to the present invention, FIG. 2 is a diagram showing the operation method including a specific operation mode of the air conditioner according to the present invention, and FIG. 3 is a diagram showing the operation method of the air conditioner according to the present invention. FIG. 4 is a diagram showing the operation method during dehumidification priority cooling operation, and FIG. 4 is a diagram showing the relationship between compressor rotation speed and efficiency of the air conditioner of the present invention.
FIG. 5 is a diagram showing the relationship between the compressor rotation speed and input ratio of the air conditioner of the present invention, FIG. 6 is a diagram showing the relationship between the compressor rotation speed and efficiency of the conventional air conditioner, and FIG. The figure is a diagram showing the relationship between compressor rotation speed and input of a conventional air conditioner. 1... variable capacity compressor, 5... indoor heat exchanger,
8... Inverter device, 12... Inverter control unit, 13... Microcomputer, 14... Temperature sensor, 15... Temperature setter, 16... Operation mode switch, 17... Current Changeover switch 17゜Applicant's agent Sato-O Compressor rotor rotation number Figure 4 Compressor rotor rotation figure Figure 6 Compressor rotation number Figure 5 Compressor rotor rotation number Figure 7

Claims (1)

[Claims] In an air conditioner equipped with a refrigeration cycle in which a variable capacity compressor, an outdoor heat exchanger, a pressure reduction device, and an indoor heat exchanger are sequentially connected by refrigerant piping, the rotation speed of the variable capacity compressor is set to the normal rotation speed. A control device configured as follows and a selection switch for operating this control device are provided, and the variable capacity compressor is operated at a speed below the normal rotation speed under specific conditions via this control device. air conditioner.