Coolant system for machine tools

• US 9,488,421 B2
• Filed: 08/21/2012
• Issued: 11/08/2016
• Est. Priority Date: 12/02/2011
• Status: Active Grant

• Current Assignee: Brinkmann Pumpen K.H. Brinkmann GmbH & Co. KG
• Original Assignee: Brinkmann Pumpen K.H. Brinkmann GmbH & Co. KG
• Inventors: Wenderott, Dirk, Kandzior, Andreas, Ulrich, Jens Holger
• Primary Examiner(s): Keasel, Eric
• Application Number:
  US14/358,522
• Publication Number:
  US 20140262197A1
• Time in Patent Office: 1,540 Days
• US Class Current: 1/1
• CPC Class Codes: B23Q 11/1038 using cutting liquids with special characteristics, e.g. flow rate, quality
• CPC Class Codes: F28F 27/00 Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus control arrangements in general G05
• CPC Class Codes: G05D 16/2066 using controlling means acting on the pressure source

Abstract

A coolant system for machine tools, includes a pump (12) for the coolant, at least one consumer (10), a pressure sensor (24) for detecting an actual pressure (P_i) in the coolant system, a feedback control device (22) acting upon the pump (12) for regulating the pressure in the coolant system to a target pressure (P_s), and a limiting valve (26) for limiting the pressure of the coolant supplied to the consumer, wherein in that the opening pressure (P_lim) of the limiting valve (26) is variable and the feedback control device (22) is adapted to adjust the opening pressure in accordance with the target pressure (P_s) such that it is always a certain amount larger than the target pressure.

Claims

1. A coolant system for machine tools having at least one consumer, comprising:

a pump for coolant,

a pressure sensor for detecting an actual pressure (P_i) in the coolant system,

a feedback control device acting upon the pump for regulating the pressure in the coolant system to a target pressure (P_s), and

a limiting valve for limiting the pressure of the coolant supplied to the at least one consumer,

wherein an opening pressure (P_lim) of the limiting valve is variable and the feedback control device is adapted to adjust the opening pressure in accordance with the target pressure (P_s) such that the opening pressure (P_lim) is always a certain amount larger than the target pressure.

2. The coolant system according to claim 1, wherein the feedback control device is adapted to adjust the opening pressure (P_lim) to a value that has a constant distance from the target pressure (P_s).

3. The coolant system according to claim 1, wherein the feedback control device is adapted to adjust the opening pressure (P_lim) to a value that is proportional to a respective target pressure (P_s).