US3213934A - Cooling system for liquids used in machine tools and similar appliances - Google Patents

Cooling system for liquids used in machine tools and similar appliances Download PDF

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US3213934A
US3213934A US289916A US28991663A US3213934A US 3213934 A US3213934 A US 3213934A US 289916 A US289916 A US 289916A US 28991663 A US28991663 A US 28991663A US 3213934 A US3213934 A US 3213934A
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casing
tank
condenser
coolant
liquid
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US289916A
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Jentet Maxime Louis
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Chausson Usines SA
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Chausson Usines SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/14—Methods or arrangements for maintaining a constant temperature in parts of machine tools
    • B23Q11/146—Methods or arrangements for maintaining a constant temperature in parts of machine tools by controlling the temperature of a cutting liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/08—Arrangements of lubricant coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/02—Arrangements for conditioning of lubricants in the lubricating system by cooling

Definitions

  • the present invention relates to a device for cooling and checking temperature, more particularly of oils used for lubrication or the control of hydraulic devices, in particular in machine-tools.
  • This device makes it especially possible to maintain liquids, for example, lubricating oils or other liquids at substantially constant temperatures or comprised between narrow temperature tolerances, which, in certain machines, is very important.
  • certain parts at least of a liquid cooling circuit are put into thermic connection with a coolant in liquid phase, contained in a sealed casing connected to a circuit of which at least a part forms a heat exchanging element for the condensation of vapours coming from the sealed casing.
  • the invention also applies to a device characterized in that it comprises a casing defining a sealed system which contains a charge of coolant, and at least, a coil connected to an oil cooling circuit and in contact with the fluid, said sealed casing communicating with at least two tubes joined by a heat exchanger element forming a condenser.
  • FIGURE 1 is a diagrammatical elevation of a device according to the invention.
  • FIGURE 2 is an elevation of an alternative.
  • the oil is pumped into a coil placed in a casing defining a sealed system which contains a coolant having a relatively low vaporisation temperature, which may be that known under the name of R12 or R22.
  • This sealed system is not, however, completely full of coolant in liquid phase, so that the heat given off by the coil causes the vaporisation of said coolant fluid, whose latent vaporisation heat is thus used for cooling the oil.
  • the part of the vaporised coolant is then brought into contact with a heat exchanger element intended to ensure its cooling, and hence, its condensation, so that a vaporisation etfect is produced in said sealed system similar to that set up in the circuit of a refrigerating appliance.
  • the casing 1 is partly introduced into the oil tank 2 which also contains a pump 3, geared, for example, actuated by the motor 4.
  • the oil level, denoted by the reference numeral 20, is controlled in such manner that it appreciably rises above the top part of the casing.
  • the device provides for the simultaneous cooling of three oil circuits
  • the casing 1 contains three coils or other independent heat exchangers 6, 6a 6b connecting the pump and three pressure regulators 7, 7a, 7b, which are provided to adjust suitably the oil pressure in the different circuits.
  • a col- 3,213,934 Patented Get. 26, 1965 ice lector tube 9 is provided for the return of the oil from the circuits to the tank 2.
  • the casing 1 is also provided with an outlet 10, enabling the casing to be emptied of air, then filled with coolant fluid.
  • the position of this outlet is chosen so that it enables the exact level of the coolant fluid in liquid phase to be known, denoted by the reference 11 and which is determined so as to cover the coils.
  • the condenser can be of any current type used. That of the drawing, according to a construction found to be advantageous, comprises two collector receptacles 15, 15a placed with their symmetry axes in the same vertical plane and communicating by a bundle of metal tubes 17, provided with cooling fins 16 or other heat dissipators. As shown, the condenser is preferably placed in a sheath 18 forming a common body with the housing of a fan 19, to be cooled by a discharge of sucked-in air.
  • the heat transmission of the oil to the coolant fluid takes place mainly through the coils within the casing 1, but also by that part of the surface of the casing which is in contact with the oil.
  • This arrangement thus has the advantage of causing the continuation of cooling of the oil even when the pump 3 is stopped, the vaporisation and condensation of the coolant fluid continuing until a thermic equilibrium is obtained.
  • a valve 21 is provided, for example, on the tube 14, this valve being controlled from a thermostatic element of which 22 denotes the probe or other sensitive component arranged to be in thermic contact with the coolant.
  • FIG. 2 An alternative shown in FIG. 2 applies to the case where a single device must act for simultaneously cooling several liquids, for example, in the case of a machine-tool requiring different oils or liquids for lubrication, for the control of hydraulic devices and for the cooling of tools.
  • the tank 2 is then divided into a number of fluid-tight chambers 2a, 2b, 20 equal to the number of liquids to be cooled, by vertical partitions 23, which are traversed by the casing 1. Consequently, to each of these chambers there corresponds a part of the surface of the casing 1.
  • each chamber contains a pump acting for the delivery of the respective liquid, through its coil, to utilization points.
  • the arrangement of coils 6 inside the casing 1 is independent of the position of the chamber pertaining thereto.
  • the surface of the casing 1 can be provided with cooling fins 24 or other elements intended to speed up the heat exchange.
  • a cooling system for the cooling of liquids in ma chine tools and similar appliances comprising a tank for the liquid to be cooled, a closed casing at least partly located inside said tank and partly filled with coolant fluid in liquid state, a heat exchanger located at a level above said casing to work as a condenser and means connected in fluid communication between the top of said tank and said condenser, said heat exchanger further having means connecting in fluid communication its lower end to said casing at the bottom thereof whereby circulation of coolant is established from said condenser to said casing and from said casing to said condenser, at least one heat exchanger coil located in said casing and in fluid communication with said tank, a pump between the inlet of said coil and said tank, said tank being supplied with heated liquid whereby said liquid is circulated from said tank to said coil in thermal contact with said coolant in liquid state contained in said casing thus causing vaporisation of coolant in said casing and circulation in said heat exchanger working as condenser.
  • Cooling system as set forth in claim 1, further comprising at least one partition in said tank, said partition being connected to said casing by fluid tight connection whereby at least two compartments are provided in said tank for containing liquids having difierent characteristics, and a plurality of coils located inside said casing equal in number to the number of compartments provided in said tank, each of said coils being connected to an independent pump whereby several independent cooling circuits for liquids having differentiated characteristics may be operated selectively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Oct. 26, 1965 M. L. JENTET COOLING SYSTEM FOR LIQUIDS USED IN MACHINE TOOLS AND SIMILAR APPLIANCES Filed June 24, 1963 2 Sheets-Sheet 1 Oct. 26, 1965 Filed June 24, 1963 M. L. JENTET COOLING SYSTEM FOR LIQUIDS USED IN MACHINE TOOLS AND SIMILAR APPLIANCES 2 Sheets-Sheet 2 United States Patent 3,213,934 CQQLING SYSTEM FGR LIQUIDS USED IN MA- CHINE TOGLS AND SIMILAR APPLIANCES Maxirne Louis .Ientet, Chatou, Seine-et-Qise, France, assignor to Societe Anonyme des Usines Chanson, Asnieres, France, a company of France Filed June 24, 1963, Ser. No. 289,916 Claims priority, application France, July 2, 1962, 902,702, Patent 1,338,889 3 Clm'rns. (Cl. 165106) The present invention relates to a device for cooling and checking temperature, more particularly of oils used for lubrication or the control of hydraulic devices, in particular in machine-tools.
This device makes it especially possible to maintain liquids, for example, lubricating oils or other liquids at substantially constant temperatures or comprised between narrow temperature tolerances, which, in certain machines, is very important.
As is well known, for retaining the effectiveness of oils, it is essential to maintain their heating within given temperature limits, which are often very narrow.
In accordance with the invention, for cooling and checking the temperature of oils or other liquids, certain parts at least of a liquid cooling circuit are put into thermic connection with a coolant in liquid phase, contained in a sealed casing connected to a circuit of which at least a part forms a heat exchanging element for the condensation of vapours coming from the sealed casing.
The invention also applies to a device characterized in that it comprises a casing defining a sealed system which contains a charge of coolant, and at least, a coil connected to an oil cooling circuit and in contact with the fluid, said sealed casing communicating with at least two tubes joined by a heat exchanger element forming a condenser.
Various other characteristics of the invention will moreover be revealed by the detailed description which follows.
A form of embodiment of the purpose of the invention is shown, by way of non-restrictive example, in the attached drawing.
FIGURE 1 is a diagrammatical elevation of a device according to the invention.
FIGURE 2 is an elevation of an alternative.
According to the invention, the oil is pumped into a coil placed in a casing defining a sealed system which contains a coolant having a relatively low vaporisation temperature, which may be that known under the name of R12 or R22.
This sealed system is not, however, completely full of coolant in liquid phase, so that the heat given off by the coil causes the vaporisation of said coolant fluid, whose latent vaporisation heat is thus used for cooling the oil. The part of the vaporised coolant is then brought into contact with a heat exchanger element intended to ensure its cooling, and hence, its condensation, so that a vaporisation etfect is produced in said sealed system similar to that set up in the circuit of a refrigerating appliance.
According to the drawing, the casing 1 is partly introduced into the oil tank 2 which also contains a pump 3, geared, for example, actuated by the motor 4. The oil level, denoted by the reference numeral 20, is controlled in such manner that it appreciably rises above the top part of the casing.
In the example of embodiment shown, the device provides for the simultaneous cooling of three oil circuits, the casing 1 contains three coils or other independent heat exchangers 6, 6a 6b connecting the pump and three pressure regulators 7, 7a, 7b, which are provided to adjust suitably the oil pressure in the different circuits. A col- 3,213,934 Patented Get. 26, 1965 ice lector tube 9 is provided for the return of the oil from the circuits to the tank 2.
The casing 1 is also provided with an outlet 10, enabling the casing to be emptied of air, then filled with coolant fluid. The position of this outlet is chosen so that it enables the exact level of the coolant fluid in liquid phase to be known, denoted by the reference 11 and which is determined so as to cover the coils.
A tube 12, communicating with the inside of the sealed casing 1 above the level 11 of the coolant fluid, leads to the upper part of a heat exchanger 13 forming a condenser whose outlet is connected by a tube 14 to the lower part of the sealed casing 1.
The condenser can be of any current type used. That of the drawing, according to a construction found to be advantageous, comprises two collector receptacles 15, 15a placed with their symmetry axes in the same vertical plane and communicating by a bundle of metal tubes 17, provided with cooling fins 16 or other heat dissipators. As shown, the condenser is preferably placed in a sheath 18 forming a common body with the housing of a fan 19, to be cooled by a discharge of sucked-in air.
Although not shown, it is obvious that it is also possible to use a condenser cooled by a circulation of water or other liquid.
The change of state resulting from the heating up of the coolant fluid in liquid phase, obviously has the effect of displacing the resulting vapour up the tube 12 towards the condenser, and condensation of the vapours is then produced in the condenser 13 located above the level 11 whereby a liquid column is produced in the condenser, the weight of which causes a rapid and permanent circulation of the coolant throughout the sealed casing.
The heat transmission of the oil to the coolant fluid takes place mainly through the coils within the casing 1, but also by that part of the surface of the casing which is in contact with the oil. This arrangement thus has the advantage of causing the continuation of cooling of the oil even when the pump 3 is stopped, the vaporisation and condensation of the coolant fluid continuing until a thermic equilibrium is obtained.
The drawing shows that it is possible to maintain the temperature of the coolant fluid appreciably constant and to this end, a valve 21 is provided, for example, on the tube 14, this valve being controlled from a thermostatic element of which 22 denotes the probe or other sensitive component arranged to be in thermic contact with the coolant.
An alternative shown in FIG. 2 applies to the case where a single device must act for simultaneously cooling several liquids, for example, in the case of a machine-tool requiring different oils or liquids for lubrication, for the control of hydraulic devices and for the cooling of tools. The tank 2 is then divided into a number of fluid-tight chambers 2a, 2b, 20 equal to the number of liquids to be cooled, by vertical partitions 23, which are traversed by the casing 1. Consequently, to each of these chambers there corresponds a part of the surface of the casing 1. Moreover, each chamber contains a pump acting for the delivery of the respective liquid, through its coil, to utilization points. The arrangement of coils 6 inside the casing 1 is independent of the position of the chamber pertaining thereto.
The invention is not restricted to the examples of embodiment, shown and described in detail, for various modifications can be applied to it without going outside of its scope. In particular, the surface of the casing 1 can be provided with cooling fins 24 or other elements intended to speed up the heat exchange.
I claim:
1. A cooling system for the cooling of liquids in ma chine tools and similar appliances comprising a tank for the liquid to be cooled, a closed casing at least partly located inside said tank and partly filled with coolant fluid in liquid state, a heat exchanger located at a level above said casing to work as a condenser and means connected in fluid communication between the top of said tank and said condenser, said heat exchanger further having means connecting in fluid communication its lower end to said casing at the bottom thereof whereby circulation of coolant is established from said condenser to said casing and from said casing to said condenser, at least one heat exchanger coil located in said casing and in fluid communication with said tank, a pump between the inlet of said coil and said tank, said tank being supplied with heated liquid whereby said liquid is circulated from said tank to said coil in thermal contact with said coolant in liquid state contained in said casing thus causing vaporisation of coolant in said casing and circulation in said heat exchanger working as condenser.
2. Cooling system as set forth in claim 1, further comprising at least one partition in said tank, said partition being connected to said casing by fluid tight connection whereby at least two compartments are provided in said tank for containing liquids having difierent characteristics, and a plurality of coils located inside said casing equal in number to the number of compartments provided in said tank, each of said coils being connected to an independent pump whereby several independent cooling circuits for liquids having differentiated characteristics may be operated selectively.
3. A cooling system as set forth in claim 1, further comprising a blowing system associated with said heat exchanger working as condenser.
References Cited by the Examiner UNITED STATES PATENTS 2,008,164 7/35 Wolf 165-140 2,083,611 6/37 Marshall 165105 2,281,906 5/42 Adams 165-105 3,105,137 9/63 Sullivan et al. 16540 FOREIGN PATENTS 557,762 8/32 Germany.
ROBERT A. OLEARY, Primary Examiner.
CHARLES SUKALO, Examiner.

Claims (1)

1. A COOLING SYSTEM FOR THE COOLING OF LIQUIDS IN MACHINE TOOLS AND SIMILAR APPLIANCES COMPRISING A TANK FOR THE LIQUID TO BE COOLED, A CLOSED CASING AT LEAST PARTLY LOCATED INSIDE SAID TANK AND PARTLY FILLED WITH COOLANT FLUID IN LIQUID STATE, A HEAT EXCHANGE LOCATED AT A LEVEL ABOVE SAID CASING TO WORK AS A CONDENSER AND MEANS CONNECTED IN FLUID COMMUNICATION BETWEEN THE TOP OF SAID TANK SAID CONDENSER, SAID HEAT EXCHANGER FURTHER HAVING MEANS CONNECTING IN FLUID COMMUNICATION ITS LOWER END TO SAID CASING AT THE BOTTOM THEREOF WHEREBY CIRCULATION OF COOLANT IS ESTABLISHED FROM SAID CONDENSER TO SAID CASING AND FROM SAID CASING TO SAID CONDENSER, AT LEAST ONE HEAT EXCHANGER COIL LOCATED IN SAID CASING AND IN FLUID COMMUNICATION WITH SAID TANK, A PUMP BETWEEN THE INLET OF SAID COIL AND SAID TANK, SAID LINK BEING SUPPLIED WITH HEATED LIQUID WHEREBY SAID LIQUID IS CIRCULATED FROM SAID TANK TO SAID COIL IN THERMAL CONTACT WITH SAID COOLANT IN LIQUID STATE CONTAINED IN SAID CASING THUS CAUSING VAPORISATION OF COOLANT IN SAID CASING AND CIRCULATION IN SAID HEAT EXCHANGER WORKING AS CONDENSER.
US289916A 1962-07-02 1963-06-24 Cooling system for liquids used in machine tools and similar appliances Expired - Lifetime US3213934A (en)

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FR902702A FR1338889A (en) 1962-07-02 1962-07-02 Method and device for cooling and temperature control, in particular machine tool oils

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GB (1) GB1046466A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588948A1 (en) * 1985-10-23 1987-04-24 Echange Fluidique Indls Ste Te Machine cooling equipment
US4922996A (en) * 1986-06-23 1990-05-08 Rees Cyril A Method and apparatus for heat recovery from hydraulic oil
US5159972A (en) * 1991-03-21 1992-11-03 Florida Power Corporation Controllable heat pipes for thermal energy transfer
US5265433A (en) * 1992-07-10 1993-11-30 Beckwith William R Air conditioning waste heat/reheat method and apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1671966B1 (en) * 1967-02-28 1972-03-09 Varta Ag DEVICE FOR COOLING LIQUID ELECTROLYTE IN FUEL ELEMENTS
US4191027A (en) * 1976-07-29 1980-03-04 Kabushiki Kaisah Maekawa Seisakusho Apparatus for cooling brine
US4363216A (en) * 1980-10-23 1982-12-14 Lucien Bronicki Lubricating system for organic fluid power plant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE557762C (en) * 1931-08-27 1932-08-27 Otto Treiber Oil cooler for vehicle engines
US2008164A (en) * 1933-10-13 1935-07-16 Gen Motors Corp Lubricant cooling system
US2083611A (en) * 1931-12-05 1937-06-15 Carrier Corp Cooling system
US2281906A (en) * 1941-03-11 1942-05-05 Socony Vacuum Oil Co Inc Adiabatic fractionating column
US3105137A (en) * 1960-01-19 1963-09-24 Electro Temp Corp Heating and/or cooling system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE557762C (en) * 1931-08-27 1932-08-27 Otto Treiber Oil cooler for vehicle engines
US2083611A (en) * 1931-12-05 1937-06-15 Carrier Corp Cooling system
US2008164A (en) * 1933-10-13 1935-07-16 Gen Motors Corp Lubricant cooling system
US2281906A (en) * 1941-03-11 1942-05-05 Socony Vacuum Oil Co Inc Adiabatic fractionating column
US3105137A (en) * 1960-01-19 1963-09-24 Electro Temp Corp Heating and/or cooling system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588948A1 (en) * 1985-10-23 1987-04-24 Echange Fluidique Indls Ste Te Machine cooling equipment
US4922996A (en) * 1986-06-23 1990-05-08 Rees Cyril A Method and apparatus for heat recovery from hydraulic oil
US5159972A (en) * 1991-03-21 1992-11-03 Florida Power Corporation Controllable heat pipes for thermal energy transfer
US5265433A (en) * 1992-07-10 1993-11-30 Beckwith William R Air conditioning waste heat/reheat method and apparatus

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DE1451267A1 (en) 1969-01-09
FR1338889A (en) 1963-10-04
GB1046466A (en) 1966-10-26
CH404345A (en) 1965-12-15

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