TEMPERATURE CONTROLLED SYSTEMS

• US 3,847,209 A
• Filed: 03/21/1973
• Issued: 11/12/1974
• Est. Priority Date: 04/21/1972
• Status: Expired due to Term

• Current Assignee: John Robert Mascall
• Original Assignee: John Robert Mascall
• Inventors: Mascall, John Robert
• Primary Examiner(s): Antonakas, Manuel A.
• Assistant Examiner(s): O'Connor, Daniel J.
• Application Number:
  US05/343,359
• Time in Patent Office: 601 Days
• Field of Search: 165/40,14,30,36,26,27
• US Class Current: 165/206
• CPC Class Codes: B29C 35/007 Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids B29C35/0294 takes precedence
• CPC Class Codes: B29C 45/7306 Control circuits therefor
• CPC Class Codes: G05D 23/1919 characterised by the type of controller

Abstract

A temperature control system which comprises a fluid heating circuit which includes, or is intended to include, a first load; said heating circuit having a first pump, fluid heating means and first control means; said first control means being responsive to the temperature of fluid in the heating circuit, having predetermined maximum and minimum temperature operative conditions and being arranged to actuate the heating means at its minimum temperature operative condition; a fluid cooling circuit which includes, or is intended to include, a second load; said cooling circuit having a second pump, fluid cooling means and second control means; said second control means being responsive to the temperature of fluid in the cooling circuit, having predetermined maximum and minimum temperature operative conditions and being arranged to actuate the cooling means at its maximum temperature operative condition; and wherein the first control means, when at its maximum temperature operative condition, is arranged to actuate normally closed first valve means which when actuated allows fluid to flow from the cooling circuit into the heating circuit, and the second control means, when at its minimum temperature operative condition is arranged to actuate normally closed second valve means which when actuated allows fluid to flow from the heating circuit into the cooling circuit.

Claims

1. A temperature control system which comprises a fluid heating circuit which includes a first load;

said heating circuit having a first pump, fluid heating means and first control means;

said first control means being responsive to the temperature of fluid in the heating circuit having predetermined maximum and minimum temperature operative conditions, said first control means being operatively connected to the heating means to actuate the heating means at its minimum temperature operative condition;

a fluid cooling circuit which includes a second load;

said cooling circuit having a second pump, fluid cooling means and second control means;

said second control means being responsive to the temperature of fluid in the cooling circuit and having predetermined maximum and minimum temperature operative conditions, said second control means being operatively connected to the cooling means to actuate the cooling means at its maximum temperature operative condition; and

wherein the first control means, when at its maximum temperature operative condition, is arranged to actuate normally closed first valve means which when actuated allows fluid to flow from the cooling circuit into the heating circuit, and the second control means, when at its minimum temperature operative condition is arranged to actuate normally closed second valve means which when actuated allows fluid to flow from the heating circuit into the cooling circuit.

2. A temperature control system as claimed in claim 1 wherein the first valve means is located in a first transfer passage which, when the first valve means is actuated communicates between a position of low fluid pressure in the heating circuit and a position of relatively higher fluid pressure in the cooling circuit, and in which the second valve means is located in a second fluid transfer passage which, when the second valve means is actuated, communicates between a position of low fluid pressure in the cooling circuit and a position of relatively higher fluid pressure in the heating circuit.

3. A temperature control system as claimed in claim 2 wherein, when the first valve means is actuated, the first transfer passage communicates between the input side of the first pump in the Heating circuit and the output side of the cooling means.

4. A temperature control system as claimed in claim 2 wherein, when the second valve means is actuated, the second transfer passage communicates between the output side of the heating means and the input side of the second pump in the cooling circuit.

5. A temperature control system as claimed in claim 1 wherein the first and second valve means comprise electrically actuated solenoid valves.

6. A temperature control system as claimed in claim 1 wherein the cooling means comprises, or is adapted to comprise, a flow of cold fluid from an external source over a heat exchange part of the cooling circuit, said flow of cold fluid being controlled by normally closed third valve means which is arranged to be actuated to permit such flow when the second control means is at its maximum temperature operative condition.

7. A temperature control system as claimed in claim 6 wherein the third valve means comprises an electrically actuated solenoid valve.

8. A temperature control system as claimed in claim 1 wherein the cooling means comprises fluid injection means which is responsive to the second control means when the latter is at its maximum temperature operative condition and is so arranged that at such condition cold fluid from an external source is passed into the cooling circuit while the excess volume of fluid in the cooling circuit is drawn off until the temperature of fluid in the cooling circuit is decreased to within the range determined by the second control means.

9. A temperature control system as claimed in claim 1 wherein a volume balance passage continuously communicates between the heating and cooling circuits for maintaining a balance of the fluids in the two circuits when fluid from either one of the heating or cooling circuits flows into the other circuit by way of the first or the second valve means.

10. A temperature control system as claimed in claim 9 wherein the volume balance passage opens into the two circuits at positions having substantially the same fluid pressures.

11. A temperature control system as claimed in claim 10 wherein the volume balance passage opens into the heating circuit on the input side of the first pump and opens into the cooling circuit on the input side of the second pump.