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DE-102024210789-A1 - Device for conveying lubricant

DE102024210789A1DE 102024210789 A1DE102024210789 A1DE 102024210789A1DE-102024210789-A1

Abstract

Device for conveying lubricant in a pump or compressor, the pump or compressor comprising a working chamber which is designed to be cyclically subjected to overpressure and underpressure during operation of the pump or compressor and thus to receive and convey fluid from a fluid reservoir in each cycle, the device comprising: an inlet silencer that communicates fluidically with the fluid reservoir at an inlet-side end and fluidically with the working chamber at an outlet-side end; a lubricant reservoir that communicates fluidically with the inlet silencer via a pressure line; A lubricant line that fluidically connects the lubricant reservoir to a lubrication point.

Inventors

  • Paul Mehringer
  • Oliver Gerundt

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241111

Claims (13)

  1. Device (10) for conveying lubricant in a pump or compressor (100), the pump or compressor (100) comprising a working chamber (105) which is configured to be cyclically subjected to overpressure and underpressure during operation of the pump or compressor (100) and thus to receive and convey fluid from a fluid reservoir (107) in each cycle, the device comprising: an inlet damper (12) which communicates fluidically with the fluid reservoir (107) at an inlet-side end (14) and fluidically with the working chamber (105) at an outlet-side end (15); a lubricant reservoir (16) which communicates fluidically with the inlet damper (12) via a pressure line (17); a lubricant line (18) which fluidly connects the lubricant reservoir (16) to a lubrication point (108).
  2. Device (10) according to Claim 1 , wherein a first check valve (19) is arranged in the lubricant line (18), which is designed to prevent a backflow of lubricant from the lubrication point (108) towards the lubricant reservoir (16).
  3. Device (10) according to one of the Claims 1 and 2 , wherein a first fluidic coupling (20) between the lubricant line (18) and the lubricant reservoir (18) is arranged such that a free surface (16a) of the lubricant expected during operation of the device (10) is geometrically above the first fluidic coupling (20).
  4. Device according to one of the Claims 1 until 3 , wherein a second fluidic coupling (21) between the pressure line (17) and the lubricant reservoir (16) is arranged such that a free surface (16a) of the lubricant expected during operation of the device (10) lies geometrically below the second fluidic coupling (21).
  5. Device (10) according to one of the Claims 1 until 4 , wherein the lubricant reservoir (16) is connected to a lubricant sump (23) via a suction line (22), and wherein a second check valve (24) is arranged in the suction line (22), which is designed to prevent a backflow of lubricant from the lubricant reservoir (16) towards the lubricant sump (23).
  6. Device (10) according to Claim 5 , wherein a third fluidic coupling (25) between the suction line (22) and the lubricant reservoir (16) is arranged such that a free surface of the lubricant expected during operation of the device (10) lies geometrically below the third fluidic coupling (25).
  7. Device (10) according to one of the Claims 1 until 6 , wherein the lubricant reservoir (16) is geometrically located above the lubrication point (108) to be lubricated.
  8. Compressor (100) for compressing a fluid, comprising a working chamber (105) configured to be cyclically pressurized and depressurized during operation of the compressor (100) and thus to receive and convey fluid from a fluid reservoir (107) in each cycle; an inlet damper (12) which communicates fluidically with the fluid reservoir (107) at an inlet end (14) and fluidically with the working chamber (105) at an outlet end (15); a lubricant reservoir (16) which communicates fluidically with the inlet damper (12) via a pressure line (17); a lubricant line (18) which fluidly connects the lubricant reservoir (16) to a lubrication point (108).
  9. Compressor (100) according to Claim 8 , comprising: a piston (109); a cylinder (110) with a cylinder chamber (114) which accommodates the piston (109) at least partially for the execution of a linear relative movement between the piston (109) and the cylinder (110) along a stroke direction (H); wherein the working space (105) is defined at least partially by the piston (109) and the cylinder chamber (114).
  10. Compressor (100) according to Claim 9 , wherein: the inlet damper (12) has at least a first damper part (12a) and a second damper part (12b) movable relative to the first damper part (12a) at least in the direction of stroke (H); and the first damper part (12a) is directly or indirectly bar is connected to the piston (109) and the second damper part (12b) is connected directly or indirectly to the cylinder (110) such that the relative movement between the piston (109) and the cylinder (110) causes a secondary relative movement between the first damper part (12a) and the second damper part (12b).
  11. Compressor (100) according to one of the Claims 9 and 10 , comprising: a coil arrangement (111) arranged adjacent to a circumference of the cylinder (110); at least one magnet (112) attached directly or indirectly to the cylinder (110) and electromagnetically cooperating with the coil arrangement (111); wherein the coil arrangement (111) and the piston (109) are arranged in a substantially immovable manner relative to each other in the stroke direction (H); and wherein the coil arrangement (111) and the piston (109) are attached to a common support structure (200).
  12. Compressor (100) according to one of the Claims 9 until 11 , wherein the lubrication point (108) comprises at least part of a contact area between the piston (109) and the cylinder (110).
  13. Refrigerant circuit, comprising: a piping system for circulating a refrigerant; and fluidically connected through the piping system, a compressor (100) according to one of the Claims 8 until 12 , a condenser, an expansion valve, and an evaporator.

Description

The invention relates to a device for conveying lubricant in a pump or compressor. In particular, the invention relates to a device for conveying lubricant in a compressor within a refrigerant circuit. The invention further relates to a compressor for compressing a fluid, in particular a compressor for use in refrigerant circuits, for example in a refrigerator or a heat pump, and to a refrigerant circuit. State of the art Compressors for refrigerant circuits, which compress a refrigerant, are well-known and often designed with a reciprocating piston drive. This drive can be, for example, a crank mechanism or a linear drive. Both principles share the characteristic that friction occurs between a cylinder and a piston, resulting in heat generation and component wear. To reduce the coefficient of friction and minimize friction, a lubricating film, such as an oil film, is typically applied at lubrication points located between the cylinder and piston. The necessary lubricant is supplied by a lubricant pump, for example, from a lubrication sump. Pumping lubricant to the lubrication points requires energy that reduces the overall efficiency of the compressor. Therefore, an object of the invention is to provide an alternative or improved device for conveying lubricant in a pump or compressor. A further object of the invention is to provide an alternative or improved compressor for compressing a fluid, in particular a compressor for use in a refrigerant circuit, for example in a refrigerator or heat pump. A further object of the invention is to provide a refrigerant circuit. Disclosure of the invention The object of the invention is achieved by means of a device for conveying lubricant in a pump or a compressor according to claim 1. The object is further achieved by means of a compressor for compressing a fluid according to claim 8, as well as by means of a refrigerant circuit according to claim 13. Advantageous further developments, additional features and/or benefits of the invention will become apparent from the dependent claims and the following description. According to a first aspect, the following is disclosed: A device for conveying lubricant in a pump or compressor, the pump or compressor comprising a working chamber which is designed to be cyclically subjected to overpressure and underpressure during operation of the pump or compressor and thus to receive and convey fluid from a fluid reservoir in each cycle, the device comprising: an inlet silencer that communicates fluidically with the fluid reservoir at an inlet-side end and fluidically with the working chamber of the cylinder at an outlet-side end; a lubricant reservoir that communicates fluidically with the inlet silencer via a pressure line; A lubricant line that fluidically connects the lubricant reservoir to a lubrication point. The device defined above allows pressure fluctuations that occur naturally in the compressor to be used as pump energy, thus avoiding the need for additional energy conversion. Furthermore, it eliminates the mechanical effort required for an additional pumping element, resulting in an improvement in the overall efficiency of the compressor and/or pump. A first check valve may be arranged in the lubricant line, which is designed to prevent a backflow of lubricant from the lubrication point towards the lubricant reservoir. A first fluidic coupling can be arranged between the lubricant line and the lubricant reservoir such that a free surface of the lubricant expected during operation of the device lies geometrically above the first fluidic coupling. A second fluidic coupling can be arranged between the pressure line and the lubricant reservoir such that a free surface of the lubricant expected during operation of the device lies geometrically below the second fluidic coupling. The lubricant reservoir can be connected to a lubricant sump via a suction line, wherein a second check valve is arranged in the suction line, which is designed to prevent a backflow of lubricant from the lubricant reservoir towards the lubricant sump. A third fluidic coupling can be arranged between the intake line and the lubricant reservoir such that a free surface of the lubricant expected during operation of the device lies geometrically below the third fluidic coupling. The lubricant reservoir can be geometrically located above the lubrication point to be lubricated. According to another aspect, the following is disclosed: A compressor for compressing a fluid, comprising a work space which is designed to be cyclically subjected to overpressure and underpressure during the operation of the compressor and thus to receive and convey fluid from a fluid reservoir in each cycle; an inlet silencer that communicates fluidically with the fluid reservoir at an inlet-side end and fluidically with the working chamber at an outlet-side end; a lubricant reservoir that communicates fluidically with the inlet silencer via a pressure line; A lubricant line that f