JPH06272932A - Method of controlling air conditioning apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] In an air conditioner equipped with a "off" timer,
An object of the present invention is to provide a method for controlling an air conditioner that reduces refrigerant noise during defrosting. [Structure] Only when going to bed when the "off" timer is operating,
By delaying the time from stopping the compressor at the start of defrosting to switching the four-way valve until the difference in the refrigerant pressure in the refrigerant circuit is balanced, the refrigerant noise due to the refrigerant passing through the four-way valve is reduced. It is characterized by

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner, and more particularly to a method for reducing refrigerant noise when defrosting an air conditioner equipped with a "off" timer.

[0002]

2. Description of the Related Art Conventionally, in the defrosting of a heat pump type air conditioner, the compressor is stopped at the start of defrosting, the discharge side pressure of the compressor is reduced, and the four-way valve is used when the pressure difference becomes below a certain value. The compressor and evaporator are reversed and the compressor is operated to defrost, but if the time from the compressor stop to the four-way valve switch is not long enough, the pressure of the condenser and evaporator will be changed. The difference is large, and the refrigerant suddenly flows through the four-way valve when the four-way valve is switched to generate a large refrigerant noise. However, if the time from stopping the compressor to switching the four-way valve is set sufficiently long for this reason, the pressure difference between the condenser and the evaporator disappears and the refrigerant noise can be prevented, but the air conditioner completely stops during that time. Therefore, the delay in the start of defrosting and the change in room temperature during that time impairs the comfortable environment in the room.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. The time from the stop of the compressor to the switching of the four-way valve when at least the off timer such as the "good night timer" is set. Is set to be longer than a predetermined time, a refrigerant sound at the time of switching the four-way valve is reduced, a sleep method is not hindered, and an air conditioner control method that does not impair indoor comfort is provided.

[0004]

In order to achieve the above object, the time until the switching of the four-way valve is set longer than a predetermined time when defrosting is started or ended only when the off timer is set.

[0005]

According to the above construction, when the four-way valve is switched to start or end defrost, only when the off timer is set,
By setting the time from the stop of the compressor to switching the four-way valve to a time longer than a predetermined time until the difference in refrigerant pressure level is eliminated, the refrigerant generated by the difference in refrigerant pressure when switching the four-way valve You can prevent noise so that you don't interfere with sleep at bedtime.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing details of a refrigerant circuit of the present invention, in which a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a capillary tube 4, and an outdoor heat exchanger 5 are sequentially connected to form a refrigerant circuit. However, when the cooling is set, the refrigerant gas compressed to high temperature and high pressure by the compressor 1 is sent to the outdoor heat exchanger 5 by the four-way valve 2 and is cooled by exchanging heat with the outdoor air by the outdoor blower, and then the capillary tube. The four-way valve 2 is liquefied under reduced pressure by 4 and heat is taken from the indoor air by the indoor heat exchanger 3 by the indoor blower to cool and gasify the room.
From the compressor 1 to the suction side of the compressor 1. At the time of heating setting, the refrigerant gas compressed to high temperature and high pressure by the compressor 1 is switched by the four-way valve 2 and the indoor heat exchanger 3
To heat the room by exchanging heat with the room air by the room side blower, and the cooled refrigerant gas is liquefied under reduced pressure by the capillary tube 4, and heat is transferred from the room air by the room heat exchanger 5 and the room air blower. It is arranged to circulate in the circuit that degasses the gas and returns from the four-way valve 2 to the suction side of the compressor 1.

FIG. 2 is a time chart showing the details of the present invention. When defrosting is performed at the time of cooling setting, when the compressor 1 is stopped, the high-pressure refrigerant gas in the outdoor heat exchanger 5 passes through the capillary tube 4 to perform indoor heat exchange. Flow to vessel 3 and gradually reduce the pressure,
Four-way valve 2 with a predetermined pressure difference after a predetermined time
The high pressure refrigerant of the outdoor heat exchanger 5 is returned to the suction side of the compressor 1 via the four-way valve 2. Conventionally, the four-way valve 2 is switched while the pressure difference remains in the outdoor heat exchanger 5 (a or c). In this state, the four-way valve 2 is switched between the outdoor heat exchanger 5 and the indoor heat exchanger 3. Has a high pressure difference, and when the four-way valve 2 is switched, it rapidly flows to the suction side of the compressor 1 through the four-way valve 2, and a refrigerant noise is generated by the flow of the refrigerant in the four-way valve 2. In the daytime environmental condition, this refrigerant noise is not very noticeable, but during bedtime or during sleep, the refrigerant noise may be annoying and disturb sleep. In the present invention, the switching of the four-way valve 2 is performed for a predetermined time until the pressure difference disappears between the outdoor heat exchanger 5 and the indoor heat exchanger 3 after the compressor 1 is stopped, only during bedtime (b or d). By waiting longer, the generation of refrigerant noise is prevented. When checking at bedtime, make a judgment based on whether or not an off timer such as a "sleep timer" is set. Only when it is set, the four-way valve 2 is turned on until the pressure difference of the refrigerant gas balances. I am trying to delay the switching time.

FIG. 3 is a flow chart showing the details of the present invention. When defrosting starts, the compressor 1 is stopped, at the same time, the indoor blower and the outdoor blower are stopped, and the defrosting display for instructing the start of defrosting is lit and displayed ( twenty one). In this state, when the off-timer is not running (22), wait for 30 seconds as an example (23), and when the off-timer is running, confirm that it is at bedtime and wait 3 minutes. (24), switch the four-way valve 2 (25), when 6 seconds have elapsed (26), start the compressor 1 to start defrosting operation (27), and when the defrosting timer times out ( 28) Stop the compressor 1 (29), when the off timer is not operating (30), wait until 30 seconds elapse (32), and if the off timer is operating, until 3 minutes elapse Standby (31), switch four-way valve 2 (33) When 6 seconds have passed (34), start compressor 1, outdoor blower, indoor blower (35), turn off defrost display (36) I am trying to return to driving. The standby time increased as an example above is a value uniquely determined by the design of the refrigerant circuit,
It shall be set by actual measurement using a model refrigerant circuit.

[0009]

As described above, according to the present invention, the time from the stop of the compressor to the switching of the four-way valve only at bedtime at the start of defrosting is fixed until the refrigerant gas pressure in the refrigerant circuit is balanced. By setting the time longer than the time, it is possible to suppress the generation of the refrigerant noise at the start of defrosting and not interfere with the sleep at bedtime. Also, by determining whether or not it is at bedtime depending on whether the off timer is operating,
It is possible to prevent the generation of annoying refrigerant noise at bedtime.

[Brief description of drawings]

FIG. 1 is a block diagram showing details of a refrigerant circuit of the present invention.

FIG. 2 is a time chart diagram showing details of a control method of the present invention.

FIG. 3 is a flowchart showing details of a control method of the present invention.

FIG. 4 is a flowchart showing details of a conventional control method.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Capillary tube 5 Outdoor heat exchanger

Claims (1)

[Claims] 1. A method for controlling an air conditioner, wherein the operation of a compressor is stopped at the start or end of defrosting, and a four-way valve is switched after a lapse of a predetermined time until the refrigerant pressure stabilizes, and the operation of a compressor is started. A method for controlling an air conditioner, wherein the time until the switching of the four-way valve is set to be longer than a predetermined time when defrosting starts or ends only when the off timer is set.