Temperature monitoring and control system

• US 6,145,752 A
• Filed: 11/04/1998
• Issued: 11/14/2000
• Est. Priority Date: 11/04/1998
• Status: Expired due to Term

• Current Assignee: Ronald E. Jackson
• Original Assignee: Ronald E. Jackson
• Inventors: Jackson, Ronald E.
• Primary Examiner(s): WAYNER, WILLIAM E
• Application Number:
  US09/185,857
• Time in Patent Office: 741 Days
• Field of Search: 236/78 R, 236/68 B, 236/99 D, 236/101 R, 62/158, 337/380, 337/333, 361/2, 165/255, 165/270
• US Class Current: 236/78.00R
• CPC Class Codes: G05D 23/2754 using bimetallic element
• CPC Class Codes: H01H 37/16 by varying the proportion of input heat received by the thermal element, e.g. by displacement of a shield
• CPC Class Codes: H01H 37/52 actuated due to deflection of bimetallic element
• CPC Class Codes: H01H 9/42 Impedances connected with contacts

Abstract

This invention generally relates to a thermostat system for use in thermal regulation of an environment.

This invention involves thermal regulation systems for controlling the temperature of an environment and the thermostat systems used in thermal regulation systems. The invention provides a pair of contacts and a creep action bi-metal thermostat, electrically connected to the pair of contacts. The bi-metal thermostat provides an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within one defined range, and the thermostat interrupts any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range. A capacitor, is electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to prevent heating caused by electrical arcing within the bi-metal thermostat from altering the performance of the bi-metal thermostat. A cover having an exterior surface confronting the medium being thermally regulated and an interior surface, enveloping the thermostat, creates a thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the medium being thermally regulated.

Claims

1. A thermostat system for producing a delayed output upon exposure to a temperature change that crosses a thermal limit between defined temperature ranges, the thermostat system comprising:

a pair of contacts;

a creep action bi-metal thermostat, electrically connected to the pair of contacts, the thermostat providing an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within a defined range, the thermostat interrupting any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range, and an enclosure having a defined three dimensional shape enclosing the thermostat and providing electrical connections between the thermostat and the contacts;

a capacitor, electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to prevent heating of the bi-metal caused by arcing when the bi-metal thermostat alters the state of the electrical connection between the contacts; and

a cover composed of a material having a thermal conductivity of 10 W/m°

C. or less and having an interior surface and an exterior surface confronting the environment being thermally regulated, the cover enveloping the thermostat, to create a thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated, the interior surface of the thermal cover forming a three dimensional surface separated from contiguous contact with the enclosure of the thermostat by spaces between the interior surface of the thermal cover and the enclosure of the thermostat to establish a thermal medium between the thermal cover and the enclosure to control the thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated.

2. A thermostat system, as claimed in claim 1, wherein said enclosure is in the form of an elongated hollow block with the elongated portion of the enclosure having a generally squared cross section, the enclosure containing said bi-metal thermostat.

3. A thermostat system, as claimed in claim 2, wherein said cover comprises two ends, one end closed and one end open into an interior channel, with the channel and the open end having a generally circular cross section and said cover enveloping the length of the elongated bi-metal thermostat enclosure within the interior channel.

4. A cover as claimed in any one of claims 1, 2 or 3, said cover being composed of a thermoplastic resin having a thickness of greater than about 0.5 mm.

5. A thermostat system as claimed in claim 1, wherein the thermal medium between the cover and the thermostat enclosure is air.

6. A thermostat system as claimed in any one of claims 1, 2, 5, wherein said capacitor has a capacitance of greater than about 0.1 micro Farads.

7. A thermostat system for temporary use in conjunction with an environmental control system to regulate the temperature of the environment within a structure, the thermostat system producing a defined output when the system is exposed to an external media having a temperature within a defined range, the thermostat system comprising:

a pair of contacts for temporary connection to an environmental control system;

a creep action bi-metal thermostat, having a single, non-adjustable set point, electrically connected to the pair of contacts, the thermostat providing an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within one defined range, and the thermostat interrupting any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range, the thermostat being contained within an enclosure forming an elongated hollow block;

a capacitor electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to inhibit heating of the bi-metal strips caused by arcing when the bi-metal thermostat alters the state of the electrical connection between the contacts; and

a cover formed having an exterior surface confronting the environment being thermally regulated, the cover enveloping the enclosure, to create a thermal drag between the temperatures experienced by the thermostat and the ambient temperature on the environment being thermally regulated.

8. A temporary thermostat system, as claimed in claim 7 wherein said capacitor has a capacitance of greater than about 0.1 micro Farads.

9. A temporary thermostat system, as claimed in claim 8 wherein said interior surface of said cover forms a cylindrical cavity receiving the elongated exterior covering of the thermostat, and said interior surface further defines spaces between the interior surface and the exterior surface of the thermostat to allow atmospheric gasses to enter into the spaces creating a further thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated.

10. A temporary thermostat system, as claimed in claim 8 wherein the interior surface of the thermal cover further envelops the capacitor.

11. A low cost system for regulating the temperature of an environment, the system compromising:

a pair of contacts;

a creep action bi-metal thermostat, the thermostat providing an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within a defined range, the thermostat interrupting any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range;

a capacitor, electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to prevent heating of the bi-metal strips caused by arcing when the bi-metal thermostat alters the state of the electrical connection between the contacts;

a cover composed of a material having a thermal conductivity of 10 W/m°

C. or less and having an interior surface and an exterior surface confronting the environment being thermally regulated, the cover enveloping the thermostat, to create a thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated;

a thermal regulator for altering the temperature of the environment, and

the thermal regulator is electrically connected to the pair of electrical contacts and activating or deactivating based upon the existence or nonexistence of an electrical circuit between the contacts for detecting the presence of and absence of an electrical connection between the pair of contacts, and activating to alter the temperature of the environment when the appropriate conditions exist at the contacts.

12. A thermostat system, as claimed claim 11, wherein said bi-metal thermostat further comprises an enclosure having a defined three dimensional shape for containing the thermostat and for permitting electrical connections between said thermostat and said contacts.

13. A thermostat system, as claimed in claim 12, wherein said interior surface of said thermal cover forms a three dimensional surface separated from contiguous contact with said enclosure of said thermostat by spaces between the interior surface of the thermal cover and the exterior cover of said thermostat to establish a thermal medium between said thermal cover and said thermostat to control the thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated.

14. A thermostat system as claimed in claim 13, wherein the thermal medium between the cover and the thermostat enclosure is air.

15. A thermostat system as claimed in any one of claims 11-13, wherein said capacitor has a capacitance of greater than about 0.1 micro Farads.

16. A cover as claimed in any one of claims 11-13, wherein said cover is composed of a thermoplastic resin having a thickness of greater than about 0.1 mm.

17. A fixed point, single temperature, thermostat for use in combination with an environmental control system, said thermostat comprising:

a pair of contacts for temporary connection to an environmental control system;

a creep action bi-metal thermostat, having a single, non-adjustable set point electrically connected to the pair of contacts, the thermostat providing an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within one defined range, and the thermostat interrupting any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range, the thermostat being contained within an enclosure forming an elongated hollow block;

a capacitor electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to inhibit heating of the bi-metal strips caused by arcing when the bi-metal thermostat alters the state of the electrical connection between the contacts; and

a cover formed from a material having a thermal conductivity of 10 W/m°

C. or less and having an exterior surface confronting the environment being thermally regulated, the cover enveloping the enclosure, and an interior surface of said cover forming an interior cavity enveloping the capacitor and the elongated exterior covering of the thermostat, and said interior surface further defining spaces between the interior surface and the exterior surface of the thermostat to allow atmospheric gasses to enter into the spaces creating a further thermal drag between the temperatures experienced by the thermostat and the ambient temperature of the environment being thermally regulated.