Compressor modulation system with multi-way valve
A compressor may include first and second scrolls, an axial biasing chamber, and a modulation control valve. The second scroll includes an outer port and an inner port. The outer and inner ports may be open to respective intermediate-pressure compression pockets. The modulation control valve may be in fluid communication with the inner port, the outer port, and the axial biasing chamber. Movement of the modulation control valve into a first position switches the compressor into a reduced-capacity mode and allows fluid communication between the inner port and the axial biasing chamber while preventing fluid communication between the outer port and the axial biasing chamber. Movement of the modulation control valve into a second position switches the compressor into a full-capacity mode and allows fluid communication between the outer port and the axial biasing chamber while preventing fluid communication between the inner port and the axial biasing chamber.
1. A compressor comprising:
a first scroll including a first end plate and a first spiral wrap extending from the first end plate;
a second scroll including a second end plate and a second spiral wrap extending from the second end plate, the first and second spiral wraps meshing with each other and forming a plurality of compression pockets therebetween, wherein the compression pockets include a suction-pressure compression pocket, a discharge-pressure compression pocket at a higher pressure than the suction-pressure compression pocket, and a plurality of intermediate-pressure compression pockets at respective pressures between the pressures of the suction and discharge compression pockets, wherein the second end plate includes an outer port and an inner port, wherein the outer port is disposed radially outward relative to the inner port, wherein the outer port is open to a first one of the intermediate-pressure compression pockets, and wherein the inner port is open to a second one of the intermediate-pressure compression pockets;
an axial biasing chamber disposed axially between the second end plate and a component, wherein the component partially defines the axial biasing chamber, and wherein working fluid disposed within the axial biasing chamber axially biases the second scroll toward the first scroll; and
a modulation control valve in fluid communication with the inner port, the outer port, and the axial biasing chamber,
wherein:
the modulation control valve is movable between a first position and a second position,
movement of the modulation control valve into the first position switches the compressor into a reduced-capacity mode and allows fluid communication between the inner port and the axial biasing chamber while preventing fluid communication between the outer port and the axial biasing chamber,
movement of the modulation control valve into the second position switches the compressor into a full-capacity mode and allows fluid communication between the outer port and the axial biasing chamber while preventing fluid communication between the inner port and the axial biasing chamber, and
the modulation control valve includes a valve body and a valve member movable relative to the valve body between the first and second positions, and wherein the valve body includes a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port.
2. The compressor of claim 1 , wherein the second end plate includes one or more modulation ports in fluid communication with one or more of the intermediate-pressure compression pockets, wherein movement of the modulation control valve into the first position allows fluid flow through the one or more modulation ports, and wherein movement of the modulation control valve into the second position prevents fluid flow through the one or more modulation ports.
3. The compressor of claim 2 , further comprising a valve ring movable relative to the second end plate between a first position in which the valve ring is spaced apart from the second end plate to allow fluid flow through the one or more modulation ports and a second position in which the valve ring blocks fluid flow through the one or more modulation ports.
4. The compressor of claim 3 , wherein the valve ring cooperates with the component to define the axial biasing chamber, wherein the valve ring partially defines a modulation control chamber, and wherein the modulation control valve is in fluid communication with the modulation control chamber.
5. The compressor of claim 4 , wherein movement of the modulation control valve into the first position allows fluid communication between the modulation control chamber and the axial biasing chamber via the modulation control valve, and wherein movement of the modulation control valve into the second position allows fluid communication between the modulation control chamber and a suction-pressure region of the compressor.
6. The compressor of claim 1 , wherein the component is a floating seal assembly.
7. The compressor of claim 1 , wherein the first scroll is an orbiting scroll, and wherein the second scroll is a non-orbiting scroll.
8. The compressor of claim 1 , wherein the valve body includes a first cavity and a second cavity that are fluidly separated from each other, wherein the first cavity is fluidly connected with the first, second, and third ports, and wherein the second cavity is fluidly connected with the fourth, fifth, and sixth ports.
9. The compressor of claim 8 , wherein when the valve member is in the first position:
the first and second ports are in fluid communication with the first cavity,
fluid communication between the third port and the first cavity is prevented,
fluid communication between the fourth port and the second cavity is prevented, and
the fifth and sixth ports are in fluid communication with the second cavity.
10. The compressor of claim 9 , wherein when the valve member is in the second position:
the first and third ports are in fluid communication with the first cavity,
fluid communication between the second port and the first cavity is prevented,
fluid communication between the fifth port and the second cavity is prevented, and
the fourth and sixth ports are in fluid communication with the second cavity.
11. The compressor of claim 10 , wherein:
the first port is fluidly connected with a modulation control chamber defined by a valve ring that opens modulation ports in the second end plate when the valve member is in the first position,
the second port is fluidly connected with the axial biasing chamber,
the third port is fluidly connected with a suction-pressure region of the compressor,
the fourth port is fluidly connected with the outer port,
the fifth port is fluidly connected with the inner port, and
the sixth port is fluid connected with the axial biasing chamber.
12. The compressor of claim 11 , wherein:
the valve member includes a first plug, a second plug, a third plug, and a fourth plug,
the first, second, third, and fourth plugs are movable together between the first and second positions,
the first plug closes an end of the third port in the first position and opens the end of the third port in the second position,
the second plug opens an end of the second port in the first position and closes the end of the second port in the second position,
the third plug closes an end of the fourth port in the first position and opens the end of the fourth port in the second position, and
the fourth plug opens an end of the fifth port in the first position and closes the end of the fifth port in the second position.
13. A compressor comprising:
a shell assembly;
an orbiting scroll disposed within the shell assembly and including a first end plate and a first spiral wrap extending from the first end plate;
a non-orbiting scroll disposed within the shell assembly and including a second end plate and a second spiral wrap extending from the second end plate, the first and second spiral wraps meshing with each other and forming a plurality of compression pockets therebetween, wherein the compression pockets include a suction-pressure compression pocket, a discharge-pressure compression pocket at a higher pressure than the suction-pressure compression pocket, and a plurality of intermediate-pressure compression pockets at respective pressures between the pressures of the suction and discharge compression pockets, wherein the second end plate includes an outer port,
an inner port, and a modulation port, wherein the outer port is disposed radially outward relative to the inner port, wherein the outer port is open to a first one of the intermediate-pressure compression pockets, and wherein the inner port is open to a second one of the intermediate-pressure compression pockets;
an axial biasing chamber disposed axially between the second end plate and a component, wherein the component partially defines the axial biasing chamber, and wherein working fluid disposed within the axial biasing chamber axially biases the non-orbiting scroll toward the orbiting scroll; and
a modulation control valve in fluid communication with the inner port, the outer port, and the axial biasing chamber,
wherein:
the modulation control valve is movable between a first position and a second position,
movement of the modulation control valve into the first position switches the compressor into a reduced-capacity mode and allows fluid communication between the inner port and the axial biasing chamber while preventing fluid communication between the outer port and the axial biasing chamber,
movement of the modulation control valve into the first position allows fluid flow through the modulation port,
movement of the modulation control valve into the second position switches the compressor into a full-capacity mode and allows fluid communication between the outer port and the axial biasing chamber while preventing fluid communication between the inner port and the axial biasing chamber,
movement of the modulation control valve into the second position prevents fluid flow through the modulation port, and
the modulation control valve includes a valve body and a valve member movable relative to the valve body between the first and second positions, and wherein the valve body includes a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port.
14. The compressor of claim 13 , wherein the valve body includes a first cavity and a second cavity that are fluidly separated from each other, wherein the first cavity is fluidly connected with the first, second, and third ports, and wherein the second cavity is fluidly connected with the fourth, fifth, and sixth ports.
15. The compressor of claim 14 , wherein when the valve member is in the first position:
the first and second ports are in fluid communication with the first cavity,
fluid communication between the third port and the first cavity is prevented,
fluid communication between the fourth port and the second cavity is prevented, and
the fifth and sixth ports are in fluid communication with the second cavity.
16. The compressor of claim 15 , wherein when the valve member is in the second position:
the first and third ports are in fluid communication with the first cavity,
fluid communication between the second port and the first cavity is prevented,
fluid communication between the fifth port and the second cavity is prevented, and
the fourth and sixth ports are in fluid communication with the second cavity.
17. The compressor of claim 16 , wherein:
the first port is fluidly connected with a modulation control chamber defined by a valve ring that opens the modulation port in the second end plate when the valve member is in the first position,
the second port is fluidly connected with the axial biasing chamber,
the third port is fluidly connected with a suction-pressure region of the compressor,
the fourth port is fluidly connected with the outer port,
the fifth port is fluidly connected with the inner port, and
the sixth port is fluid connected with the axial biasing chamber.
18. The compressor of claim 17 , wherein:
the valve member includes a first plug, a second plug, a third plug, and a fourth plug,
the first, second, third, and fourth plugs are movable together between the first and second positions,
the first plug closes an end of the third port in the first position and opens the end of the third port in the second position,
the second plug opens an end of the second port in the first position and closes the end of the second port in the second position,
the third plug closes an end of the fourth port in the first position and opens the end of the fourth port in the second position, and
the fourth plug opens an end of the fifth port in the first position and closes the end of the fifth port in the second position.
19. The compressor of claim 18 , wherein:
the valve ring closes the modulation port when the valve member is in the second position,
the valve ring cooperates with the component to define the axial biasing chamber,
the modulation control valve is in fluid communication with the modulation control chamber,
movement of the modulation control valve into the first position allows fluid communication between the modulation control chamber and the axial biasing chamber via the modulation control valve, and
movement of the modulation control valve into the second position allows fluid communication between the modulation control chamber and a suction-pressure region of the compressor.