Compressor and controlling method of volume ratio thereof

Abstract

A compressor and a controlling method of a volume ratio thereof. The compressor includes a body, a screw compression group, a volume adjusting group, a driving group, and a control module. The body has an intake end and a discharge end relative to the intake end. The screw compression group is disposed in the body. The volume adjusting group is disposed in the body, corresponding to the screw compression group. The driving group is coupled to the volume adjusting group and configured for driving the volume adjusting group to adjust the volume ratio. The control module is electrically connected to the driving group and configured for detecting operation statuses of preceding and following time sequences and recording the same as corresponding evaluation indicators. Based on a comparison result of the evaluation indicators, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio.

What is claimed is: 
     
         1 . A controlling method of a volume ratio of a compressor, comprising:
 receiving an initiation command;   setting an adjustment flag to a preset flag value;   recording a previous evaluation indicator;   performing a determination and an adjustment, comprising:
 waiting for a preset time; 
 recording a current evaluation indicator; 
 determining whether the current evaluation indicator conforms to a preset condition as compared to the previous evaluation indicator; 
 if the current evaluation indicator conforms to the preset condition, maintaining the adjustment flag as the preset flag value, and if the current evaluation indicator does not conform to the preset condition, setting the adjustment flag to a reverse flag value; and 
 determining whether the adjustment flag is the preset flag value, if so, performing the adjustment in a same direction as the preset flag value, and if not, performing the adjustment in a reverse direction to the preset flag value; and 
 updating the previous evaluation indicator and repeatedly performing the determination and the adjustment. 
   
     
     
         2 . The controlling method of the volume ratio of the compressor according to  claim 1 , wherein the determination and the adjustment further comprises:
 after determining whether the current evaluation indicator conforms to the preset condition as compared to the previous evaluation indicator, determining whether a same-direction adjustment count is less than a preset count;   if the same-direction adjustment count is less than the preset count, updating the same-direction adjustment count; and   if the same-direction adjustment count is greater than or equal to the preset count, setting the adjustment flag to the reverse flag value and resetting the same-direction adjustment count to zero.   
     
     
         3 . The controlling method of the volume ratio of the compressor according to  claim 2 , wherein updating the same-direction adjustment count comprises adding one count to the same-direction adjustment count. 
     
     
         4 . The controlling method of the volume ratio of the compressor according to  claim 2 , further comprising:
 after receiving the initiation command, resetting the same-direction adjustment count to zero.   
     
     
         5 . The controlling method of the volume ratio of the compressor according to  claim 1 , wherein updating the previous evaluation indicator comprises replacing the previous evaluation indicator with the current evaluation indicator. 
     
     
         6 . The controlling method of the volume ratio of the compressor according to  claim 1 , wherein the previous evaluation indicator and the current evaluation indicator comprise a current, a power, or a performance. 
     
     
         7 . The controlling method of the volume ratio of the compressor according to  claim 1 , wherein the preset condition is the current evaluation indicator being superior to or equal to the previous evaluation indicator. 
     
     
         8 . The controlling method of the volume ratio of the compressor according to  claim 7 , wherein the current evaluation indicator being superior to or equal to the previous evaluation indicator comprises a current operating current being lower than or equal to a previous operating current, a current consumed power being lower than or equal to a previous consumed power, or a current performance being superior to or equal to a previous performance. 
     
     
         9 . A compressor, comprising:
 a body, having an intake end and a discharge end relative to the intake end;   a screw compression group, disposed in the body;   a volume adjusting group, disposed in the body and corresponding to the screw compression group;   a driving group, coupled to the volume adjusting group and used to drive the volume adjusting group to adjust a volume ratio; and   a control module, electrically connected to the driving group and used to detect a plurality of operation statuses of a preceding time sequence and a following time sequence and record the same as a plurality of corresponding evaluation indicators, wherein based on a comparison result of the plurality of evaluation indicators of the preceding time sequence and the following time sequence, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio.   
     
     
         10 . The compressor according to  claim 9 , wherein the control module is used to:
 receive an initiation command;   set an adjustment flag to a preset flag value;   record a previous evaluation indicator;   perform a determination and an adjustment, comprising
 waiting for a preset time; 
 recording a current evaluation indicator; 
 determining whether the current evaluation indicator conforms to a preset condition as compared to the previous evaluation indicator; 
 if the current evaluation indicator conforms to the preset condition, maintaining the adjustment flag as the preset flag value, and if the current evaluation indicator does not conform to the preset condition, setting the adjustment flag to a reverse flag value; and 
   determining whether the adjustment flag is the preset flag value, if so, performing the adjustment in a same direction as the preset flag value, and if not, performing the adjustment in a reverse direction to the preset flag value; and   updating the previous evaluation indicator and repeatedly performing the determination and the adjustment.   
     
     
         11 . The compressor according to  claim 10 , wherein the control module is further used to:
 after determining whether the current evaluation indicator conforms to the preset condition as compared to the previous evaluation indicator, determine whether a same-direction adjustment count is less than a preset count;   if the same-direction adjustment count is less than the preset count, update the same-direction adjustment count; and   if the same-direction adjustment count is greater than or equal to the preset count, set the adjustment flag to the reverse flag value and reset the same-direction adjustment count to zero.   
     
     
         12 . The compressor according to  claim 11 , wherein updating the same-direction adjustment count comprises adding one count to the same-direction adjustment count. 
     
     
         13 . The compressor according to  claim 10 , wherein updating the previous evaluation indicator comprises replacing the previous evaluation indicator with the current evaluation indicator. 
     
     
         14 . The compressor according to  claim 10 , wherein the previous evaluation indicator and the current evaluation indicator comprise a current, a power, or a performance. 
     
     
         15 . The compressor according to  claim 10 , wherein the preset condition is the current evaluation indicator being superior to or equal to the previous evaluation indicator. 
     
     
         16 . The compressor according to  claim 15 , wherein the current evaluation indicator being superior to or equal to the previous evaluation indicator comprises a current operating current being lower than or equal to a previous operating current, a current consumed power being lower than or equal to a previous consumed power, or a current performance being superior to or equal to a previous performance. 
     
     
         17 . The compressor according to  claim 10 , wherein the volume adjusting group comprises a piston element coupled to the driving group and a slider connected to the piston element, wherein the slider is disposed on one side of the screw compression group, and the piston element is used to drive the slider to slide toward the intake end or toward the discharge end. 
     
     
         18 . The compressor according to  claim 17 , wherein the driving group comprises a first oil circuit and a second oil circuit coupled to the piston element, wherein when the control module connects the first oil circuit and disconnects the second oil circuit, the piston element slides toward the intake end, and when the control module connects the second oil circuit and disconnects the first oil circuit, the piston element slides toward the discharge end. 
     
     
         19 . The compressor according to  claim 10 , wherein the volume adjusting group comprises a screw coupled to the driving group and a slider coupled to the screw, wherein the slider is disposed on one side of the screw compression group, and the screw is used to drive the slider to slide toward the intake end or toward the discharge end. 
     
     
         20 . The compressor according to  claim 19 , wherein the driving group comprises a motor, and the screw is coupled to the motor, wherein when the control module controls the motor to drive the screw to rotate in a first rotational direction, the screw drives the slider to slide toward the intake end, and when the control module controls the motor to drive the screw to rotate in a second rotational direction reverse to the first rotational direction, the screw drives the slider to slide toward the discharge end.