Stirling cycle machine

• US 8,763,391 B2
• Filed: 07/01/2010
• Issued: 07/01/2014
• Est. Priority Date: 04/23/2007
• Status: Active Grant

• Current Assignee: New Power Concepts LLC
• Original Assignee: Deka Products Limited Partnership
• Inventors: Kamen, Dean, Langenfeld, Christopher C., Bhat, Prashant, Norris, Michael G., Smith, Stanley B. III, Werner, Christopher M.
• Primary Examiner(s): JETTON, CHRISTOPHER M
• Application Number:
  US12/829,329
• Publication Number:
  US 20110011079A1
• Time in Patent Office: 1,461 Days
• Field of Search: 60516-526, 123/51.BB, 92216-221
• US Class Current: 60/525
• CPC Class Codes: F02B 2075/1808 two
• CPC Class Codes: F02B 75/18 Multi-cylinder engines scavenging aspects F02B25/00
• CPC Class Codes: F02B 75/1896 with two or more pistons connected to one crank and having a common combustion space
• CPC Class Codes: F02F 3/0023 the parts being bolted or screwed together
• CPC Class Codes: F02G 1/043 the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
• CPC Class Codes: F02G 1/0435 the engine being of the free piston type
• CPC Class Codes: F02G 1/0445 Engine plants with combined cycles, e.g. Vuilleumier
• CPC Class Codes: F02G 1/055 Heaters or coolers
• CPC Class Codes: F02G 2244/08 having parallel cylinder, e.g. "Rider" engines
• CPC Class Codes: F02G 2253/08 Stem with rolling membranes
• CPC Class Codes: F02G 2253/80 Sealing of the crankcase
• CPC Class Codes: F02G 2254/10 by burners
• CPC Class Codes: F02G 2255/00 Heater tubes
• CPC Class Codes: F02G 2257/00 Regenerators
• CPC Class Codes: F02G 2270/005 Shells, e.g. a sealed or sealing shell for a Stirling engine
• CPC Class Codes: F02G 2270/85 Crankshafts
• CPC Class Codes: F16H 21/12 for conveying rotary motion
• CPC Class Codes: F16H 21/34 with two or more connecting-rods to each crank or eccentric
• CPC Class Codes: F16H 35/18 Turning devices for rotatable members, e.g. shafts
• CPC Class Codes: F25B 9/14 characterised by the cycle used, e.g. Stirling cycle
• CPC Class Codes: Y02W 10/37 : using solar energy
• CPC Class Codes: Y10T 74/18392 : Crank, pitman, and crank

Abstract

A Stirling cycle machine. The machine includes at least one rocking drive mechanism which includes: a rocking beam having a rocker pivot, at least one cylinder and at least one piston. The piston is housed within a respective cylinder and is capable of substantially linearly reciprocating within the respective cylinder. Also, the drive mechanism includes at least one coupling assembly having a proximal end and a distal end. The linear motion of the piston is converted to rotary motion of the rocking beam. Also, a crankcase housing the rocking beam and housing a first portion of the coupling assembly is included. The machine also includes a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling assembly. An airlock is included between the workspace and the crankcase and a seal is included for sealing the workspace from the airlock and crankcase. A burner and burner control system is also included for heating the machine and controlling ignition and combustion in the burner.

Claims

1. A Stirling cycle machine comprising:

at least one rocking drive mechanism comprising;

a rocking beam having a rocker pivot;

at least one cylinder;

at least one piston, the piston housed within a respective cylinder whereby the piston is capable of substantially linearly reciprocating within the respective cylinder; and

at least one coupling assembly having a proximal end and a distal end, the proximal end being connected to the piston and the distal end being connected to the rocking beam by an end pivot, whereby linear motion of the piston is converted to rotary motion of the rocking beam;

a crankcase housing the rocking beam and housing a first portion of the coupling assembly;

a crankshaft coupled to the rocking beam by way of a connecting rod, whereby the rotary motion of the rocking beam is transferred to the crankshaft;

a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling assembly; and

an airlock space separating the crankcase and the working space for maintaining a pressure differential between the crankcase housing and the working space housing.

2. The Stirling cycle machine as set forth in claim 1 further comprising a first seal for sealing the crankcase from the airlock space, wherein the seal is a rolling diaphragm.

3. The Stirling cycle machine as set forth in claim 1 further comprising a first seal for sealing the crankcase from the airlock space, wherein the seal is a pair of oppositely disposed rolling diaphragms.

4. The Stirling cycle machine as set forth in claim 2 further comprising a second seal for sealing the workspace from the airlock space, wherein the seal is a high pressure seal.

5. The Stirling cycle machine as set forth in claim 1 further comprising an airlock pressure regulator connected between the crankcase and one of the airlock space and the working space.

6. The Stirling cycle machine as set forth in claim 1 wherein the airlock pressure regulator is a bidirectional pressure regulator for maintaining a predetermined pressure differential between the crankcase and one of the airlock space and the working space.

7. An external combustion engine comprising:

at least two rocking drive mechanisms comprising;

a rocking beam having a rocker pivot;

at least two cylinders;

at least two pistons, the pistons each housed within a respective cylinder whereby the pistons are capable of substantially linearly reciprocating within the respective cylinder; and

two coupling assemblies having a proximal end and a distal end, the proximal end being connected to the piston and the distal end being connected to the rocking beam by an end pivot, whereby linear motion of the piston is converted to rotary motion of the rocking beam;

a crankcase housing the rocking beam and housing a first portion of the coupling assemblies;

a crankshaft coupled to the rocking beam by way of a connecting rod, whereby the rotary motion of the rocking beam is transferred to the crankshaft;

a lubricating fluid pump in the crankcase for pumping lubricating fluid to lubricate the crankshaft and the rocking beam and the first portion of the coupling assemblies;

a working space housing the cylinders, the pistons and the second portion of the coupling assemblies;

an airlock space separating the crankcase and the working space for maintaining a pressure differential between the crankcase housing and the working space housing; and

a heating element comprising a burner having at least one burner head for igniting and maintaining a heating flame in a combustion chamber adjacent the at least one heater head; and

an electronic control unit managing the heating element according to operational data of the engine obtained from at least one of the rocking drive mechanisms, lubricating fluid pump, the crankcase, the working space, crankshaft, heating element and the airlock.

8. The external combustion engine as set forth in claim 7 wherein the burner comprises a burner head igniting and maintaining a single flame for heating a plurality of heater heads.

9. The external combustion engine as set forth in claim 7 further comprising at least one of a cooling gas and air input wherein the electronic control unit measures a temperature at the at least one heater head and supplies the at least one of a cooling gas and air input to manage the temperature of the heater head.

10. The external combustion engine as set forth in claim 9 further comprising a single blower controlled according to the electronic control unit to provide the at least one of a cooling gas and air input to the engine.