Motor protector in pocket on non-orbiting scroll and routing of wires thereto

• US 6,454,538 B1
• Filed: 04/05/2001
• Issued: 09/24/2002
• Est. Priority Date: 04/05/2001
• Status: Active Grant

• Current Assignee: Scroll Technologies (Danfoss A/S)
• Original Assignee: Scroll Technologies (Danfoss A/S)
• Inventors: Hugenroth, Jason, Witham, Robert Carl
• Primary Examiner(s): Thorpe, Timothy S.
• Assistant Examiner(s): GRAY, MICHAEL KUHN
• Application Number:
  US09/827,190
• Time in Patent Office: 537 Days
• Field of Search: 417/32, 417/44.2, 417/410.5, 417/292, 417/307, 418/55.1
• US Class Current: 417/32
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 28/28 Safety arrangements; Monitoring

Abstract

A scroll compressor is provided with a motor protector for stopping operation of its motor should conditions be indicative of a problem. The motor protector is sensitive to elevated temperature, and stops operation of the motor should a sensed temperature exceed a predetermined maximum. The motor protector is positioned in a chamber in a rear face of a base of the non-orbiting scroll. A port extends through the base of the non-orbiting scroll to connect a motor protector chamber to a suction chamber. Electric wires connect the motor protector to the motor and extend through this same port. In some embodiments, a pressure relief valve also communicates with the motor protector chamber. In one embodiment the motor protector chamber is enclosed by a cap and the pressure relief valve is mounted in that cap. In another embodiment the pressure relief valve extends through a wall of the non-orbiting scroll. In other embodiments, a pair of mating plugs connect the protector to the motor.

Claims

1. A scroll compressor comprising:

a first scroll member having a base and a generally spiral wrap extending from said base;

a second scroll member having a base and a generally spiral wrap extending from said base, said spiral wraps of said first and second scroll members interfitting to define compression chambers, and said first scroll member having a discharge port for communicating with a discharge chamber defined by a sealed housing;

said second scroll member being driven to orbit by an electric motor, and orbiting movement of said second scroll member relative to said first scroll member causing said compression chambers to decrease in volume, compressing an entrapped refrigerant;

said sealed housing defining both a discharge pressure chamber on one side of said first scroll member and a suction pressure chamber on an opposed side of said first scroll member;

a motor protector for sensing temperature, and stopping operation of said motor if said sensed temperature exceeds a predetermined maximum, said motor protector being positioned within a chamber in a rear face of said base of said first scroll member, said chamber being isolated from said discharge port;

a pressure relief valve communicating said discharge chamber into said motor protector chamber; and

a port extending through said first scroll member, electric wires connecting said motor protector to said motor and extending through said port, and said suction chamber communicating with said motor protector chamber through said port.

2. A scroll compressor as recited in claim 1, wherein said motor protector is positioned in an enlarged chamber in said rear face of said first scroll member, with said port being of a smaller cross-sectional area than said enlarged chamber.

3. A scroll compressor as recited in claim 1, wherein a cap housing member is positioned within said motor protector chamber to seal said discharge chamber from said motor protector chamber.

4. A scroll compressor as recited in claim 3, wherein said pressure relief valve is mounted within said cap.

5. A scroll compressor as recited in claim 3, wherein said pressure relief valve is positioned within said base of said first scroll member.

6. A scroll compressor as recited in claim 1, wherein said pressure relief valve is positioned within said base of said first scroll member.

7. A scroll compressor as recited in claim 1, wherein said first scroll member defines a separation area between said discharge chamber and a suction chamber surrounding said motor.

8. A scroll compressor comprising:

a first scroll member having a base and a generally spiral wrap extending from said base;

a second scroll member having a base and a generally spiral wrap extending from said base, said spiral wraps of said first and second scroll members interfitting to define compression chambers, and said first scroll member having a discharge port for communicating with a discharge chamber defined by a sealed housing;

said second scroll member being driven to orbit by an electric motor, and orbiting movement of said second scroll member relative to said first scroll member causing said compression chambers to decrease in volume, compressing an entrapped refrigerant;

said sealed housing defining both a discharge pressure chamber on one side of said first scroll member and a suction pressure chamber on an opposed side of said first scroll member;

a motor protector for sensing temperature, and stopping operation of said motor if said sensed temperature exceeds a predetermined maximum, said motor protector being positioned within a chamber in a rear face of said base of said first scroll member; and

electric wires extending from said motor protector to a plug, said plug being connected to a mating plug for communicating said wires to said electric motor.

9. A scroll compressor as recited in claim 8, wherein said non-orbiting scroll including a recess in a base opposed to said rear face, said recess receiving said plug.

10. A scroll compressor as recited in claim 9, wherein a crank case supports the second scroll member, and said mating plug being received in a recess in said crank case.

11. A scroll compressor as recited in claim 10, wherein at least one of said plugs have an enlarged outer periphery to provide a seal for sealing between said discharge and suction chambers.

12. A scroll compressor as recited in claim 10, wherein each of said recesses in said crank case and said first scroll member having a generally smaller slot extending into said recess such that said plugs may be mounted into said recess by first passing said wires through said slot, and then moving said plug into said recess.

13. A scroll compressor comprising:

a first scroll member having a base and a generally spiral wrap extending from said base;

a second scroll member having a base and a generally spiral wrap extending from said base, said spiral wraps of said first and second scroll members interfitting to define compression chambers, and said first scroll member having a discharge port for communicating with a discharge chamber defined by a sealed housing;

said second scroll member being driven to orbit by an electric motor, and orbiting movement of said second scroll member relative to said first scroll member causing said compression chambers to decrease in volume, compressing an entrapped refrigerant;

said sealed housing defining both a discharge pressure chamber on one side of said first scroll member and a suction pressure chamber on an opposed side of said first scroll member;

a motor protector for sensing temperature, and stopping operation of said motor if said sensed temperature exceeds a predetermined maximum, said motor protector being positioned within a chamber in a rear face of said base of said first scroll member; and

electric wires extending from said motor protector to said motor, and passing through a port in said base of said first scroll member, and a seal for sealing between said discharge pressure chambers and said port.

14. A scroll compressor as recited in claim 13, wherein a cap secures said chamber receiving said motor protector to provide said seal.

15. A scroll compressor as recited in claim 13, wherein said wires are received within a pair of mating plugs, with said mating plugs providing said seal.