Air-conditioner and operation control method thereof

Abstract

An air-conditioner includes a small-capacity compressor and a large-capacity compressor for compressing a refrigerant to a high temperature high pressure gaseous refrigerant; a valve for connecting a suction opening of a refrigerant channel of the large-capacity compressor and a discharge passage of a refrigerant channel of the large-capacity compressor; and a controller for controlling the small-capacity compressor, the large-capacity compressor and the valve.

1 . An air-conditioner comprising: 
 a small-capacity compressor and a large-capacity compressor for compressing a refrigerant to a high temperature high pressure gaseous refrigerant;    a valve for connecting a suction opening of a refrigerant channel of the large-capacity compressor and a discharge passage of a refrigerant channel of the large-capacity compressor; and    a controller for controlling the small-capacity compressor, the large-capacity compressor and the valve.    
   
   
       2 . The air-conditioner of  claim 1 , wherein while the small-capacitor compressor is being operated, the controller operates the valve for a certain time before actuating the large-capacity compressor, and then, the controller operates the large-capacity compressor.  
   
   
       3 . The air-conditioner of  claim 1 , wherein the controller performs a controlling operation by the following steps comprising: 
 a first step in which, in case of a cooling operation, a small-capacity compressor and a large-capacity compressor are actuated, and then, when a value of a room temperature varied by the actuated small-capacity compressor and large-capacity compressor is smaller than a value obtained by subtracting a pre-set first temperature from a desired temperature set by a user, the small-capacity compressor and the large-capacity compressor are stopped;    a second step in which in a state than the small-capacity compressor and the large-capacity compressor are stopped, when the value of the room temperature is greater than a value obtained by adding a pre-set second temperature to the desired temperature, it goes back to the first step;    a third step in which the first and second steps are repeatedly performed as many as the pre-set number of times;    a fourth step in which only the small-capacity compressor is controlled to satisfy a relation of (desired temperature−pre-set first temperature≦room temperature≦(desired temperature−pre-set second temperature);    a fifth step in which when the value of the room temperature is greater than a value obtained by adding a pre-set third temperature to the desired temperature, a valve is operated for a certain time and then stopped; and    a sixth step in which the large-capacity compressor is actuated.    
   
   
       4 . The air-conditioner of  claim 2 , wherein the certain time is 1 minute and 30 seconds.  
   
   
       5 . The air-conditioner of  claim 3 , wherein the certain time is 1 minute and 30 seconds.  
   
   
       6 . The air-conditioner of  claim 3 , wherein the pre-set first and second temperatures are 0.5° C.  
   
   
       7 . The air-conditioner of  claim 3 , wherein the pre-set third temperature is greater than the pre-set first and second temperatures.  
   
   
       8 . The air-conditioner of  claim 3 , wherein the pre-set number of times is two times.  
   
   
       9 . A method for controlling an operation of an air-conditioner comprising: 
 operating a small-capacity compressor;    making the pressure of a suction end of a refrigerant channel and a pressure of a discharge end of the refrigerant channel of a large-capacity compressor equal while the small-capacity compressor is being operated; and    actuating the large-capacity compressor after making the two pressures equal.    
   
   
       10 . A method for controlling an operation of an air-conditioner comprising: 
 a first step in which, in case of a cooling operation, a small-capacity compressor and a large-capacity compressor are actuated, and then, when a value of a room temperature varied by the actuated small-capacity compressor and large-capacity compressor is smaller than a value obtained by subtracting a pre-set first temperature from a desired temperature set by a user, the small-capacity compressor and the large-capacity compressor are stopped;    a second step in which in a state than the small-capacity compressor and the large-capacity compressor are stopped, when the value of the room temperature is greater than a value obtained by adding a pre-set second temperature to the desired temperature, it goes back to the first step;    a third step in which the first and second steps are repeatedly performed as many as the pre-set number of times;    a fourth step in which only the small-capacity compressor is controlled to satisfy a relation of (desired temperature−pre-set first temperature≦room temperature≦(desired temperature−pre-set second temperature);    a fifth step in which when the value of the room temperature is greater than a value obtained by adding a pre-set third temperature to the desired temperature, a valve is operated for a certain time and then stopped; and    a sixth step in which the large-capacity compressor is actuated.    
   
   
       11 . The method of  claim 10 , wherein the fourth step comprises: 
 a step in which after the small-capacity compressor is actuated, if the value of the room temperature varied by the actuated small-capacity compressor is smaller than the value obtained by subtracting the pre-set first temperature from the desired temperature, the small-capacity compressor is stopped; and    a step in which with the small-capacity compressor stopped, if the value of the room temperature is greater than the value obtained by adding the pre-set second temperature to the desired temperature, the small-capacity compressor is actuated.    
   
   
       12 . The method of  claim 10 , wherein the certain time is 1 minute and 30 seconds.  
   
   
       13 . The method of  claim 10 , wherein the pre-set first and second temperatures are 0.5°.  
   
   
       14 . The method of  claim 10 , wherein the pre-set third temperature is greater than the pre-set first and second temperatures.  
   
   
       15 . The method of  claim 10 , wherein the pre-set number is two times.  
   
   
       16 . An air-conditioner comprising: 
 a small-capacity compressor and a large-capacity compressor for compressing a refrigerant to a high temperature high pressure gaseous refrigerant;    a valve for connecting a suction opening of a refrigerant channel of the large-capacity compressor and a discharge passage of a refrigerant channel of the large-capacity compressor; and    a controller for performing a controlling operation by the following steps comprising:    a first step in which, in case of a heating operation, a small-capacity compressor and a large-capacity compressor are actuated, and then, when a value of a room temperature varied by the actuated small-capacity compressor and large-capacity compressor is smaller than a value obtained by subtracting a pre-set first temperature from a desired temperature set by a user, the small-capacity compressor and the large-capacity compressor are stopped;    a second step in which in a state than the small-capacity compressor and the large-capacity compressor are stopped, when the value of the room temperature is greater than a value obtained by adding a pre-set second temperature to the desired temperature, it goes back to the first step;    a third step in which the first and second steps are repeatedly performed as many as the pre-set number of times;    a fourth step in which only the small-capacity compressor is controlled to satisfy a relation of (desired temperature−pre-set first temperature≦room temperature≦(desired temperature−pre-set second temperature);    a fifth step in which when the value of the room temperature is greater than a value obtained by adding a pre-set third temperature to the desired temperature, a valve is operated for a certain time and then stopped; and    a sixth step in which the large-capacity compressor is actuated.