Cooling Device

Abstract

The invention relates to a cooling device for a machine tool ( 10 ) for cooling a heated fluid, for example a cooling lubricants, comprising at least one refrigerating unit ( 48 ) for a fluid which is filtered by a filtering unit ( 40 ) and is received form at least one storage tank ( 38 ) by means of a pumping unit provided with at least one hydraulic pump (P 2 ), separated clean ( 22 ) and waste ( 36 ) tanks, wherein the refrigerating unit ( 48 ) returns the circulating cooled fluid to the clean tank ( 22 ). Since the hydraulic pump (P 2 ) of the pumping unit supplies the fluid only filtered by the filtering unit ( 40 ) from the waste tank ( 36 ) to the clean tank ( 22 ) and another independent hydraulic pump (P 5 ) continues to supply the fluid from the clean tank to the refrigerating unit ( 48 ) for a subsequent circulation, the base structure of a known refrigerating device can be preserved and possible pressure losses caused by the blinding of the filter of the filtering unit have no negative effects on the constantly maintained flow rates for the refrigerating unit.

1 . Cooling device for a machine tool ( 10 ) for cooling a heated fluid, such as cooling lubricant, with at least one refrigerating unit ( 48 ) which receives filtered fluid from a filter means ( 40 ) by a pumping means with at least one hydraulic pump (P 2 ), and which originates from at least one storage tank ( 38 ), with a subdivision into a clean tank ( 22 ) and a dirty tank ( 36 ), the refrigerating unit ( 48 ) returning the fluid which has been cooled in circulation to the clean tank ( 22 ), characterized in that the hydraulic pump (P 2 ) of the pump means conveys fluid filtered exclusively with the filter means ( 40 ) from the dirty tank ( 36 ) into the clean tank ( 22 ) and that another independent hydraulic pump (P 5 ) continues to convey the fluid which has been delivered into the clean tank ( 22 ) to the refrigerating unit ( 48 ) for circulation. 
   
   
       2 . The cooling device according to  claim 1 , wherein the refrigerating unit ( 48 ) is a compressor-refrigerating unit with a heat exchanger ( 50 ), a compressor means ( 52 ) and an evaporator means. 
   
   
       3 . The cooling device according to  claim 2 , wherein the evaporator means is formed from the heat exchanger ( 50 ). 
   
   
       4 . The cooling device according to  claim 1 , wherein the machine tool ( 10 ) has parts which are to be supplied with fluid, such as drives ( 12 ,  14 ,  16 ) which are supplied by means of at least one other third hydraulic pump (P 4 ) to a feed line ( 20 ) from the respective clean tank ( 22 ) and which return the fluid distributed to them heated to the clean tank ( 22 ) via the return ( 28 ). 
   
   
       5 . The cooling device according to  claim 1 , wherein fluid from the clean tank ( 22 ) can be transported to a cleaning or flushing means ( 30 ,  32 ) of the machine tool ( 10 ) by means of at least one additional fourth hydraulic pump (P 3 ). 
   
   
       6 . The cooling device according to  claim 1 , wherein on the machine tool ( 10 ) fluid emerging into the exterior is collected in a collecting station ( 34 ) and can be removed by means of at least another fifth hydraulic pump (P 1 ) to the respective dirty tank. 
   
   
       7 . The cooling device according to  claim 5 , wherein a flow monitor which has been inserted into the feed line ( 20 ) triggers the respective fourth hydraulic pump (P 3 ) and turns it off especially when the feed line ( 20 ) is free of fluid. 
   
   
       8 . The cooling device according to  claim 1 , wherein matching of the current cooling power demand of the entire machine tool ( 10 ) takes place by a control means which turns the refrigerating unit ( 48 ) on or off when the upper or the lower boundary of the definable setpoint temperature is reached. 
   
   
       9 . The cooling device according to  claim 4 , wherein removal of the fluid for the refrigerating unit ( 48 ) takes place in the hot region of the clean tank ( 22 ) which is located in the vicinity of the junction site of the return ( 26 ) into the clean tank ( 22 ) and accepts the heated fluid from the parts of the machine tool ( 10 ) to be supplied, within the clean tank ( 22 ). 
   
   
       10 . The cooling device according to  claim 1 , wherein the machine tool ( 10 ) is a grinding machine, especially a five-axle grinding machine.