# US 11,994,126 B2 · Methods and systems for lubricating a transport climate control system having an auxiliary sump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,126 B2 - Document ID: US11994126B2 - Status: Granted - Kind: B2 - Application number: 17/688,430 - Filed: 2022-03-07 - Published: 2023-09-07 - Granted: 2024-05-28 - Earliest claimed: 2022-03-07 - Assignees: Thermo King Corporation - Applicants: Thermo King LLC - Inventors: Eric S. Mlsna; Lars I. Sjoholm - Web page: https://patentgrep.com/patent/US11994126B2 ## CPC - F04C 18/0215: {where only one member is moving} - F04C 23/008: {Hermetic pumps} - F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) - F04C 29/025: {using a lubricant pump} - F04C 2240/30: Casings or housings - F04C 2240/809: Lubricant sump - F04C 2270/24: Level of liquid, e.g. lubricant or cooling liquid - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A climate control system includes a compressor which includes a compressor housing, a compressor element provided in the compressor housing, a lubricant circuit, and an auxiliary sump. The lubricant circuit includes a lubricant sump provided in the compressor housing. The auxiliary sump is in fluid communication with the lubricant sump. A method for maintaining lubrication supply for a compressor of a climate control system includes transferring lubricant from the auxiliary sump to the lubricant sump of the compressor when a height of the lubricant in the auxiliary sump is greater than a height in the lubricant sump and returning the lubricant from the lubricant sump to the auxiliary sump when a height of the lubricant in the lubricant sump is higher than a height of a predetermined minimum level in the lubricant sump. The lubricant in the auxiliary sump and lubricant sump are equalized by gravity. ## Claims ### Claim 1 A climate control system comprising: a compressor, the compressor comprising: a compressor housing; a compressor element provided in the compressor housing for compressing a working fluid; a lubricant circuit, wherein the lubricant circuit comprises a lubricant sump provided in the compressor housing for storing a lubricant, wherein the lubricant is provided for lubricating moving parts of the compressor; and an auxiliary sump in fluid communication with the lubricant sump, wherein the auxiliary sump is configured such that the lubricant flows by gravity between the auxiliary sump and the lubricant sump, wherein the auxiliary sump is provided externally of the compressor housing and is in fluid communication with the lubricant sump via a pipe, wherein the auxiliary sump includes a bottom plate, wherein the bottom plate is provided at a vertical height that is at least equal to a height of a predetermined level in the lubricant sump, and wherein the predetermined level of the lubricant sump is a minimum level of lubricant necessary for lubricating the moving parts of the compressor. ### Claim 2 (depends on 1) The climate control system according to claim 1, wherein the auxiliary sump comprises a plurality of auxiliary tanks. ### Claim 3 (depends on 1) The climate control system according to claim 1, wherein the auxiliary sump includes a diameter or length that is greater than a height of the auxiliary sump. ### Claim 4 (depends on 1) The climate control system according to claim 1, wherein the auxiliary sump is only in fluid communication with the lubricant sump of the compressor. ### Claim 5 (depends on 1) The climate control system according to claim 1, wherein the pipe is connected at least to the bottom of the auxiliary sump and to the lubricant sump at the predetermined level. ### Claim 6 (depends on 5) The climate control system according to claim 5, wherein the lubricant circuit further comprises a second pipe connected to a vapor space in the auxiliary sump and above a fluid level of the lubricant sump. ### Claim 7 (depends on 6) The climate control system according to claim 6, wherein the second pipe is provided at a maximum level of lubricant in the lubricant sump. ### Claim 8 (depends on 1) The climate control system according to claim 1, wherein the pipe is connected to the bottom plate of the auxiliary sump and to the lubricant sump at the predetermined level, wherein the pipe has a diameter in which the lubricant is provided in the pipe at a height equal to a height of the lubricant in the auxiliary sump so that a vapor space is provided in the pipe that is connected to a vapor space in the auxiliary sump and a vapor space in the lubricant sump. ### Claim 9 (depends on 1) The climate control system according to claim 1, wherein the compressor is a scroll compressor and the lubricant sump is provided vertically below the compressor element of the scroll compressor. ### Claim 10 A lubricant circuit for a compressor of a climate control system, comprising: a lubricant sump provided in a compressor housing for storing a lubricant, wherein the lubricant is provided for lubricating moving parts of the compressor, and an auxiliary sump in fluid communication with the lubricant sump, wherein the auxiliary sump is configured in a way such that the lubricant flows by gravity between the auxiliary sump and the lubricant sump, wherein the auxiliary sump is provided externally of the compressor housing and is in fluid communication with the lubricant sump via a pipe, wherein the auxiliary sump includes a bottom plate, wherein the bottom plate is provided at a vertical height that is at least equal to a height of a predetermined level in the lubricant sump, and wherein the predetermined level of the lubricant sump is a minimum level of lubricant necessary for lubricating the moving parts of the compressor. ### Claim 11 (depends on 10) The lubricant circuit according to claim 10, wherein the pipe is connected at least to the bottom plate of the auxiliary sump and to the lubricant sump at the predetermined level. ### Claim 12 (depends on 11) The lubricant circuit according to claim 11, wherein the lubricant circuit comprises a second pipe connected to a vapor space in the auxiliary sump and above a fluid level of the lubricant sump. ### Claim 13 (depends on 11) The lubricant circuit according to claim 11, wherein the pipe has a diameter in which the lubricant is provided in the pipe at a height equal to a height of the lubricant in the auxiliary sump so that a vapor space is provided in the pipe that is connected to a vapor space in the auxiliary sump and a vapor space in the lubricant sump. ### Claim 14 A method for maintaining lubrication supply for a compressor of a climate control system, the climate control system comprising a compressor comprising a compressor housing, a compressor element provided in the compressor housing for compressing a working fluid, and a lubricant circuit, wherein the lubricant circuit comprises a lubricant sump provided in the compressor housing for storing a lubricant; and an auxiliary sump in fluid communication with the lubricant sump, the method comprising: transferring lubricant, via a pipe, from the auxiliary sump to the lubricant sump of the compressor when a height of the lubricant in the auxiliary sump is greater than a height of the lubricant in the lubricant sump, wherein the auxiliary sump is provided externally of the compressor housing and a bottom plate of the auxiliary sump is provided at a vertical height that is at least equal to a height of a predetermined level in the lubricant sump, and returning the lubricant from the lubricant sump to the auxiliary sump, via the pipe, when the height of the lubricant in the lubricant sump is higher than the height of the predetermined level in the lubricant sump, wherein the predetermined level of the lubricant sump is a minimum level of lubricant necessary for lubricating moving parts of the compressor, wherein the lubricant in the auxiliary sump and lubricant sump are equalized by gravity.