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DE-102024210795-A1 - reciprocating compressor

DE102024210795A1DE 102024210795 A1DE102024210795 A1DE 102024210795A1DE-102024210795-A1

Abstract

The invention relates to a reciprocating piston compressor (10), comprising: a cylinder (11), a piston (15) arranged to be linearly movable within the cylinder (11), an oil circuit (1) to build up an oil film (2) in a gap (5) between an inner wall (12) of the cylinder (11) and an outer wall (16) of the piston (15), an oil pump (20) for pumping oil (3) from an oil reservoir (4) for the oil circuit (1), wherein the oil pump (20) has a hollow body (30) with a first opening (31) and a second opening (32) wherein the first opening (31) is arranged in the oil reservoir (4), wherein a first valve (35) is provided in the hollow body (30) between the first opening (31) and the second opening (32), wherein the first valve (35) allows an inflow of oil (3) into the hollow body (30) and makes it difficult or prevents a backflow of oil (3) from the hollow body (30) into the oil reservoir (4), wherein the second opening (32) is arranged outside the oil reservoir (4) and is connected to the gap (5), wherein means are provided to generate a back-and-forth movement of the hollow body (30), wherein, by means of the back-and-forth movement of the hollow body (30), oil (3) from the oil reservoir (4) can be conveyed via the first opening (31) through the first valve (35) to the second opening (32) into the gap (5).

Inventors

  • Valerio Pinto
  • Mirijam Weimer
  • Robert Mayer
  • Sebastien Feurton

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241111

Claims (9)

  1. Reciprocating compressor (10) comprising: a cylinder (11), a piston (15) arranged to be linearly movable within the cylinder (11), an oil circuit (1) for building up an oil film (2) in a gap (5) between an inner wall (12) of the cylinder (11) and an outer wall (16) of the piston (15), an oil pump (20) for pumping oil (3) from an oil reservoir (4) for the oil circuit (1), the oil pump (20) having a hollow body (30) with a first opening (31) and a second opening (32), the first opening (31) being arranged in the oil reservoir (4), a first valve (35) being provided in the hollow body (30) between the first opening (31) and the second opening (32), the first valve (35) providing an inlet of oil (3) into the hollow body (30). enables and hinders or prevents a backflow of oil (3) from the hollow body (30) into the oil reservoir (4), whereby the second opening (32) is arranged outside the oil reservoir (4) and is connected to the gap (5), whereby means are provided to generate a back-and-forth movement of the hollow body (30), whereby, by means of the back-and-forth movement of the hollow body (30), oil (3) can be conveyed from the oil reservoir (4) via the first opening (31) through the first valve (35) to the second opening (32) in the gap (5).
  2. reciprocating compressor (10) according to Claim 1 , wherein the first valve (35) of the hollow body (30) is designed as a check valve, in particular as a disc valve or as a ball valve.
  3. reciprocating compressor (10) according to Claim 1 or 2 , wherein a second valve (36) is provided between the first valve (35) and the second opening (32) of the hollow body (30), wherein the second valve (36) allows oil to drain from the hollow body (30) via the second opening (32) and makes it difficult or prevents backflow of oil via the second opening (32) into the hollow body (30), wherein the second valve (36) is in particular designed as a check valve.
  4. reciprocating compressor (10) according to one of the Claims 1 until 3 , wherein at least one section of the hollow body (30) extends along a first longitudinal axis (41), wherein the means are provided to generate the reciprocating motion of the hollow body (30) substantially in the direction of the first longitudinal axis (41).
  5. reciprocating compressor (10) according to one of the Claims 1 until 4 , wherein the hollow body (30) is coupled to the piston (15), wherein the back-and-forth movement of the hollow body (30) can be generated using the piston (15).
  6. reciprocating compressor (10) according to one of the Claims 1 until 5 , wherein the hollow body (30) is tubular with a first section (51) wherein the first section (51) extends along a first longitudinal axis (41), wherein the first opening (31) is substantially located on the first longitudinal axis (41) and is located in a first end region (61) of the hollow body (30).
  7. reciprocating compressor (10) according to Claim 6 , wherein the second opening (32) is arranged substantially on the first longitudinal axis (41) and in a second end region (62) of the tubular hollow body (30).
  8. reciprocating compressor (10) according to Claim 6 , wherein the tubular hollow body (30) has a second section (52), wherein the second section (52) extends along a second longitudinal axis (42), wherein the second longitudinal axis (42) is arranged transversely to the first longitudinal axis (41), wherein the second section (52) is arranged in a second end region (62) of the tubular hollow body (30), and wherein the second opening (32) is substantially arranged on the second longitudinal axis (42).
  9. reciprocating compressor (1) according Claim 8 , wherein the first section (51) has a first cross-section (55), wherein the second section (52) has a second cross-section (56), wherein the first cross-section (55) is larger than the second cross-section (56).

Description

The invention relates to a reciprocating compressor, in particular for cooling devices. State of the art Reciprocating compressors are known from the state of the art. For the lubrication and sealing of reciprocating compressors, an oil film is necessary in the gap between a piston and a cylinder. Oil pumps are used to create an oil circuit for a reciprocating compressor. The oil pumps circulate oil using a piston located inside the pump. Out of US 8,070,460 B2 A reciprocating piston pump is known. Disclosure of the invention The object underlying the invention can be seen as providing an improved reciprocating compressor. In particular, the reciprocating compressor should have an improved service life, reduced maintenance requirements, and at the same time high efficiency and wear resistance. This problem is solved using a reciprocating compressor according to the independent claim. Advantageous embodiments are the subject of the dependent claims. According to a first aspect of the invention, a reciprocating compressor is provided, comprising: a cylinder, a piston arranged to move linearly within the cylinder, an oil circuit for building up an oil film in a gap between an inner wall of the cylinder and an outer wall of the piston, An oil pump for pumping oil from an oil reservoir for the oil circuit, wherein the oil pump has a hollow body with a first opening and a second opening, wherein the first opening is arranged in the oil reservoir, wherein a first valve is provided in the hollow body between the first opening and the second opening, wherein the first valve allows an inflow of oil into the hollow body and makes a backflow of oil from the hollow body into the oil reservoir difficult or prevents it, wherein the second opening is arranged outside the oil reservoir and is connected to the gap, wherein means are provided to generate a reciprocating motion of the hollow body, wherein, by means of the reciprocating motion of the hollow body, oil can be conveyed from the oil reservoir via the first opening through the valve to the second opening in the gap. This allows, for example, the technical advantage of providing an improved reciprocating compressor. The proposed reciprocating compressor offers the particular advantage that an oil film can be built up in the gap between an inner and outer cylinder wall using a pistonless oil pump. For this purpose, the oil pump has a hollow body with a first and a second opening, and a first valve that allows oil to flow into the hollow body while hindering or preventing backflow. Furthermore, means are provided to enable the reciprocating movement of the hollow body. This reciprocating movement allows oil to be conveyed from the oil reservoir through the first opening, via the valve, to the second opening in the gap of the reciprocating compressor. Consequently, the proposed reciprocating compressor does not require a separate piston for the oil pump. The oil pump can circulate the oil to build up an oil film by moving the hollow body back and forth, even without a piston. This allows the number of components in the proposed reciprocating compressor to be reduced, resulting in lower manufacturing and maintenance costs. In another embodiment, the first valve of the hollow body is designed as a check valve, in particular as a disc valve or ball valve. This allows, for example, the technical advantage of making the transfer of oil from the first opening to the second opening in the oil circuit more efficient. Using a check valve, and in particular a disc valve or ball valve, the backflow of oil from the hollow body into the oil reservoir can be made particularly difficult or prevented. In a further embodiment, a second valve is provided between the first valve and the second opening of the hollow body. This second valve allows oil to drain from the hollow body through the second opening, while hindering or preventing backflow of oil through the second opening into the hollow body. The second valve is specifically designed as a check valve. This allows, for example, the technical advantage of increasing the efficiency of the reciprocating piston to further increase the compressor's capacity. The second valve can advantageously restrict the backflow of oil into the hollow body, thereby improving the delivery of oil to the oil circuit. A disc valve or a ball valve can be used as the check valve. In a further embodiment, at least one section of the hollow body extends along a first longitudinal axis, wherein means are provided to generate the back-and-forth movement of the hollow body essentially in the direction of the first longitudinal axis. This allows, for example, the technical advantage that the oil can be conveyed particularly quickly and efficiently for the oil circuit using the hollow body. Due to the back-and-forth movement of the hollow body, primarily along its first longitudinal axis, the oil pump for the reciprocating compressor can be operated with exception