# US 2016/0258656 A1 · System Including High-Side and Low-Side Compressors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0258656 A1 - Document ID: US20160258656A1 - Status: Published application - Kind: A1 - Application number: 15/156,977 - Filed: 2016-05-17 - Published: 2016-09-08 - Earliest claimed: 2013-02-26 - Assignees: Emerson Climate Technologies, Inc. - Applicants: Emerson Climate Technologies, Inc. - Inventors: Michael M. PEREVOZCHIKOV; Kirill M. IGNATIEV - Web page: https://patentgrep.com/patent/US20160258656A1 ## CPC - F04C 23/008: {Hermetic pumps} - F04C 18/0215: {where only one member is moving} - F04C 23/001: {of similar working principle} - F04C 28/02: specially adapted for several pumps connected in series or in parallel - F25B 1/10: with multi-stage compression (with cascade operation F25B7/00) - F25B 9/008: {the refrigerant being carbon dioxide} - F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) - F25B 49/02: for compression type machines, plants or systems - F04C 2270/24: Level of liquid, e.g. lubricant or cooling liquid - F25B 2309/061: with cycle highest pressure above the supercritical pressure - F25B 2400/0401: for compressors - F25B 2400/075: with parallel compressors - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract A system may be operable to circulate a working fluid between first and second heat exchangers. The system may include a suction line, a low-side compressor, a high-side compressor and a discharge line. The low-side and high-side compressors may both be in fluid communication with the suction and discharge lines. ## Claims ### Claim 1 A system operable to circulate fluid between first and second heat exchangers and including a suction line, a low-side compressor, a high-side compressor and a discharge line, said low-side and high-side compressors both being in fluid communication with said suction and discharge lines, wherein said suction line is fluidly coupled to a low-side suction inlet and a high-side suction inlet, wherein a discharge outlet of said high-side compressor feeds compressed fluid to said low-side suction inlet. ### Claim 2 (depends on 1) The system of claim 1, wherein a discharge chamber of said high-side compressor and a suction chamber of said low-side compressor are at substantially equal pressures when said high-side and low-side compressors are operating at approximately one-hundred percent capacity. ### Claim 3 (depends on 1) The system of claim 1, wherein said high-side compressor includes a first shell assembly and a first compression mechanism, said first shell assembly defining a first discharge-pressure chamber, said first compression mechanism is disposed within said first discharge-pressure chamber, and wherein said low-side compressor includes a second shell assembly and a second compression mechanism, said second shell assembly defining a suction-pressure chamber and a second discharge-pressure chamber, said second compression mechanism is disposed within said suction-pressure chamber. ### Claim 4 (depends on 3) The system of claim 3, wherein an oil sump of said low-side compressor is disposed within said suction-pressure chamber, and an oil sump of said high-side compressor is disposed within said first discharge-pressure chamber. ### Claim 5 (depends on 4) The system of claim 4, further comprising an oil conduit fluidly connecting said oil sumps of said low-side and high-side compressors. ### Claim 6 (depends on 3) The system of claim 3, wherein said low-side compressor includes a motor disposed within said suction-pressure chamber and drivingly engaged with said second compression mechanism. ### Claim 7 (depends on 6) The system of claim 6, wherein said high-side compressor includes another motor disposed within said first discharge-pressure chamber and drivingly engaged with said first compression mechanism. ### Claim 8 (depends on 1) The system of claim 1, further comprising a bypass conduit directly coupling said suction line with said low-side suction inlet. ### Claim 9 A system operable to circulate fluid between first and second heat exchangers and including a suction line, a low-side compressor, a high-side compressor and a discharge line, said low-side and high-side compressors both being in fluid communication with said suction and discharge lines, wherein said suction line is fluidly coupled to a low-side suction inlet and a high-side suction inlet, wherein said high-side suction inlet receives fluid discharged by said low-side compressor, the system including a bypass conduit directly coupling said suction line with said high-side suction inlet. ### Claim 10 (depends on 9) The system of claim 9, wherein a shell of said low-side compressor is disposed between said suction line and said high-side suction inlet, such that fluid passes through a suction chamber defined by said shell after exiting said suction line and before entering said high-side compressor. ### Claim 11 (depends on 9) The system of claim 9, wherein said high-side compressor includes a first shell assembly and a first compression mechanism, said first shell assembly defining a first discharge-pressure chamber, said first compression mechanism is disposed within said first discharge-pressure chamber, and wherein said low-side compressor includes a second shell assembly and a second compression mechanism, said second shell assembly defining a suction-pressure chamber and a second discharge-pressure chamber, said second compression mechanism is disposed within said suction-pressure chamber. ### Claim 12 (depends on 11) The system of claim 11, wherein an oil sump of said low-side compressor is disposed within said suction-pressure chamber, and an oil sump of said high-side compressor is disposed within said first discharge-pressure chamber. ### Claim 13 (depends on 12) The system of claim 12, further comprising an oil conduit fluidly connecting oil sumps of said low-side and high-side compressors. ### Claim 14 (depends on 11) The system of claim 11, wherein said low-side compressor includes a motor disposed within said suction-pressure chamber and drivingly engaged with said second compression mechanism. ### Claim 15 (depends on 14) The system of claim 14, wherein said high-side compressor includes another motor disposed within said first discharge-pressure chamber and drivingly engaged with said first compression mechanism. ### Claim 16 (depends on 13) The system of claim 13, further comprising a valve disposed on said oil conduit. ### Claim 17 (depends on 16) The system of claim 16, wherein said valve is electronically controlled to regulate oil levels within said oil sumps of said low-side and high-side compressors.