Lubricant container for a refrigerant compressor and refrigerant compressor

Abstract

The present invention relates to a lubricant reservoir comprising: at least one rotationally symmetrical, sleeve-shaped receiving section for receiving lubricant, wherein the longitudinal axis of the receiving section is coaxially arranged with the longitudinal axis of the crankshaft of a refrigerant compressor; a fixing section connected to the receiving section to fix the lubricant reservoir to the crankshaft; and at least one end region connected to the receiving section, the end region enclosing the receiving section except for an inlet, wherein the inlet in the end region allows lubricant to enter from the lubricant reservoir of the refrigerant compressor into the receiving section of the lubricant reservoir, which at least partially extends into the lubricant reservoir; the inlet is arranged in the end region surrounding the longitudinal axis; the inlet has a non-circular circumferential shape when viewed along the longitudinal axis; the inlet has the shape of an elongated orifice; and the midpoint of the elongated orifice is offset from the intersection of the longitudinal axis of the receiving section and the end region of the lubricant reservoir.

Description

[0001] This application is a divisional application of the national patent application No. 201780069043.7, filed on December 22, 2017, entitled "Lubricant Reservoir for Refrigerant Compressor and Refrigerant Compressor". Technical Field

[0002] This invention relates to a lubricant reservoir. Furthermore, this invention also relates to a refrigerant compressor. Background Technology

[0003] In refrigerant compressors, ensuring adequate lubrication of all moving components is of paramount importance. For this purpose, it can be stipulated that lubricant accumulated in the lubricant reservoir at the bottom of the compressor housing is delivered via the crankshaft towards the cylinders.

[0004] For this purpose, a sleeve-shaped lubricant reservoir is often provided, which is torsionally connected to and coaxially arranged with the crankshaft, and extends into the lubricant reservoir with an end section. The lubricant entering the reservoir section from the lubricant reservoir through the inlet is forced into a parabolic shape due to the rotation of the lubricant reservoir caused by the rotation of the crankshaft, wherein the parabola is formed along the inner wall of the lubricant reservoir and along the inner wall of the crankshaft.

[0005] The maximum height that the lubricant in the lubricant reservoir section can rise in this way is naturally reached within the range of the crankshaft's net inner diameter and depends on the square of the rotational speed of the lubricant reservoir and the square of the net inner radius of the crankshaft or the lubricant reservoir.

[0006] Therefore, when manufacturing parameters (e.g., the net inner radius of the crankshaft, the height of the outlet bore) and process parameters (e.g., the rotational speed of the crankshaft, the viscosity of the lubricant) are selected accordingly, the lubricant can be delivered from the bottom of the compressor housing through the crankshaft of the compressor to the support of the main bearing of the crankshaft, the crank pin, and the connecting rod of the refrigerant compressor via the lubricant reservoir.

[0007] For example, compressors with such lubricant reservoirs are known from WO2009 / 092147A1.

[0008] However, when using these devices, air bubbles typically form within the lubricant reservoir and / or inlet area and / or throughout the lubricant delivery system (i.e., the area between the lubricant reservoir and the component to be lubricated, where the lubricant is located). These air bubbles can cause short-term interruptions in the lubrication system. Furthermore, these air bubbles can cause fluctuations in the vertical position of the lower vertex of the parabola. When this vertex descends into the inlet area, this can lead to an interruption of the lubricant delivery system and, consequently, a break in the parabolic shape of the lubricant within the lubricant reservoir or crankshaft.

[0009] Due to a malfunction in the lubricant delivery system, fluctuations occurred in the oil supply to the crankpin. In the extreme case that can be seen when the oil supply is interrupted, all moving parts operate without lubrication, causing the compressor to fail in the shortest possible time. Summary of the Invention

[0010] Therefore, the objective of the present invention is to provide a lubricant reservoir and, more particularly, a refrigerant compressor having a lubricant reservoir according to the present invention, wherein a permanent closure of the inlet due to the formation of air bubbles in the area of ​​the lubricant reservoir or the area of ​​the inlet can be avoided.

[0011] In addition, it should be ensured that when bubbles are generated, they burst in the shortest possible time and therefore do not seal the lubricant reservoir for an extended period of time.

[0012] Furthermore, the lubricant reservoir according to the invention should be able to be manufactured in a particularly simple and cost-effective manner and should be structurally simple.

[0013] In the lubricant reservoir according to the invention, the task is solved in such a way that the inlet has a non-circular circumferential shape when viewed along the longitudinal axis, the inlet has the shape of an elongated hole, and the midpoint of the elongated hole is offset from the intersection of the longitudinal axis of the receiving section and the end region of the lubricant reservoir. The lubricant reservoir according to the invention comprises: at least one rotationally symmetrical, sleeve-shaped receiving section for receiving lubricant, wherein the longitudinal axis of the receiving section is coaxially arranged with the longitudinal axis of the crankshaft of the refrigerant compressor; a fixing section connected to the receiving section to fix the lubricant reservoir to the crankshaft; and at least one end region connected to the receiving section, the end region closing the receiving section except for the inlet, wherein the inlet allows lubricant to enter from the lubricant reservoir of the refrigerant compressor into the receiving section of the lubricant reservoir, which at least partially extends into the lubricant reservoir, wherein the inlet is arranged in the end section surrounding the longitudinal axis.

[0014] Specifically, the projection, i.e., the orthogonal projection of the end region along the longitudinal axis of the receiving section, should be configured to be asymmetrical in rotation about the intersection of the longitudinal axis of the receiving section and the end region, based on the inlet. This asymmetrical configuration prevents the inlet from being permanently blocked due to the formation of air bubbles in the lubricant reservoir or inlet area. While it is theoretically possible for the inlet of the lubricant reservoir to be temporarily blocked by air bubbles as usual, the lubricant reservoir according to the invention causes the possible air bubbles to be unstable and immediately detach from the inlet due to the uneven distribution of the centripetal force acting on the air bubbles exiting the lubricant reservoir and blocking the inlet. In this case, the inlet is released again after a very short time, for example, at most 2 seconds, thus preventing permanent blockage.

[0015] According to the present invention, the entrance is arranged in the end region surrounding the longitudinal axis. The asymmetry required in the rotation of the orthogonal projection of the end region around the intersection of the longitudinal axis of the receiving section and the end region is achieved by the non-circular construction of the circumferential shape of the entrance or by the corresponding offset of the midpoint of the circular entrance from the longitudinal axis.

[0016] Here, the end region of the lubricant reservoir may be constructed as a flat surface, in which case the rounded edge of the inlet is also in a plane; however, the end region of the lubricant reservoir may also be constructed as a curved surface, so that the periphery of the inlet arranged in the end region presents a three-dimensional curve. In the latter case, the inlet has a circular or non-circular circumferential shape when viewed along the longitudinal axis.

[0017] From a manufacturing perspective, several advantages are gained when the inlet originates at the center of rotation in the end region of the lubricant reservoir. This desired shape of the inlet, encompassing the intersection of the longitudinal axis of the receiving section and the end region, can in this case be easily achieved by reworking the inlet's profile, the shape of which causes the required asymmetry in the projection of the end region. Starting with a circular, centrally located drill hole, an inlet with a circumferential shape capable of satisfying the required asymmetry can thus be created.

[0018] Furthermore, the inlet arranged around the longitudinal axis in the end region causes the bubbles in the closed inlet to burst even faster. Unlike in a lubricant reservoir with radially outward inlets, i.e., without inlets arranged around the longitudinal axis, bubbles constructed in the lubricant reservoir according to the invention naturally reach the inlet more quickly. It should be noted that the lubricant entering the receiving section of the lubricant reservoir from the lubricant tank through the inlet is initially forced into a parabolic shape due to the rotation of the lubricant reservoir caused by the crankshaft rotation, wherein the parabola forms along the inner wall of the lubricant reservoir. During the rotation of the lubricant reservoir under one operating condition of the compressor (the lubricant reservoir is mounted on the crankshaft of the compressor), the exhaust effect within the lubricant reservoir causes a change in the geometry of the parabola. This results in the parabola forming a vertex in the region along the longitudinal axis of the receiving section, which continuously descends towards the end region of the lubricant reservoir. Only when the vertex of the parabola reaches the inlet can a portion of the parabola, i.e., the bubble, escape from the lubricant reservoir. With the arrangement and shape of the inlet according to the invention, the bubble bursts from the inlet in the shortest possible time, typically within a fraction of a second. However, when the inlet is not arranged around the longitudinal axis but rather in the edge region radially outside the end region, the bubble—if present—may take a long time to escape from the lubricant reservoir. In this case, parabolic breakage or a sudden drop in lubricant delivery power may occur within the lubricant reservoir.

[0019] In principle, the most dissimilarly shaped and arranged entrances to the orthogonal projection of the end region can achieve the required asymmetry in terms of rotation around the intersection of the longitudinal axis of the receiving section of the lubricant reservoir and the end region, i.e., around the midpoint of the projection. This asymmetry can be achieved, for example, by elliptical or circular entrances, wherein the midpoint of the circular entrance should not coincide with the intersection of the longitudinal axis of the receiving section of the lubricant reservoir and the end region of the lubricant reservoir.

[0020] Therefore, in a preferred embodiment of the present invention, it is specified that the entrance has an elliptical circumferential shape when viewed along the longitudinal axis.

[0021] An entrance with a generally elliptical circumferential shape can also be advantageous, in which the circumferential shape of such an entrance, while not exhibiting a mathematically perfect ellipse, produces a similar appearance.

[0022] The desired asymmetry of the inlet in the lubricant reservoir according to the invention can be achieved in a particularly simple and cost-effective manner by having an elongated orifice shape. The midpoint of this orifice can either coincide with or be offset from the intersection of the longitudinal axis of the receiving section of the lubricant reservoir and the end region. In both cases, the desired asymmetry is achieved because the projection of the end region along the longitudinal axis of the receiving section is asymmetrical about rotation around the intersection of the longitudinal axis of the receiving section and the end region, based on the elongated orifice. Figure 2 A lubricant reservoir according to the invention is shown, with an elongated hole whose midpoint does not coincide with the intersection point.

[0023] It has been proven here that the implementation of the inlet as an elongated orifice according to the invention is particularly advantageous in terms of the lubricant entering the receiving section from the lubricant tank or in terms of preventing the inlet from being permanently blocked by air bubbles.

[0024] In a particularly preferred embodiment of the lubricant reservoir according to the invention, the lubricant can be introduced from the lubricant tank into the receiving section of the lubricant reservoir in a hydrodynamically optimized manner, wherein the elongated hole is semi-circularly bounded on both sides and the longitudinal side of the elongated hole is larger than the radius of the semi-circular bounding portion.

[0025] To simplify the manufacturing of such elongated holes, in another preferred embodiment of the lubricant reservoir according to the invention, the length of the longitudinal side of the elongated hole is between one and two times the radius of the semicircular limiting portion.

[0026] Here, "longitudinal side" refers to the straight side of the elongated hole that extends parallel to each other. Furthermore, the total length of the elongated hole is composed of the length of the longitudinal side plus the two radii of the semi-circular boundary.

[0027] Because the size and shape of the inlet affect the parabolic surface formed in the receiving section of the lubricant reservoir during rotation, these parameters must be carefully selected. In another particularly preferred embodiment of the lubricant reservoir according to the invention, it has proven particularly advantageous that the size of the inlet is between 5% and 30%, preferably between 10% and 25%, and especially preferably between 15% and 20% of the net cross-section of the receiving section. This allows a particularly advantageous parabolic shape to be formed within the receiving section.

[0028] In order to ensure that the lubricant in the lubricant reservoir is delivered towards the cylinder inside the crankshaft while making full use of the crankshaft's rotation, the parabolic surfaces of rotation formed on the inner side of the lubricant reservoir and the inner side of the crankshaft should be minimized.

[0029] To achieve a transition between the lubricant reservoir section and the crankshaft as uninterrupted as possible, the lubricant reservoir section is provided with a fixing section (16) connected to the reservoir section to secure the lubricant reservoir section to the crankshaft. Alternatively or additionally, the lubricant reservoir section can be secured to a rotor that is torsionally connected to the crankshaft by means of the fixing section.

[0030] In a preferred embodiment of the invention, the lubricant reservoir has at least one lubricant actuator for lubricant to facilitate the formation of a lubricant parabola in the lubricant reservoir.

[0031] The lubricant drive component can here be a rigid structure, such as a twisted metal plate element, arranged in the receiving section.

[0032] The objective of this invention is achieved in a refrigerant compressor having a lubricant reservoir according to the invention for delivering lubricant from a lubricant reservoir constructed in the bottom region of the compressor housing via a crankshaft to a piston-cylinder unit, wherein the lubricant reservoir is torsionally connected to the crankshaft, the refrigerant compressor comprising: a compressor housing capable of being hermetically encapsulated; an electrically driven unit disposed within the housing, the electrically driven unit comprising a rotor and a stator; a crankshaft torsionally connected to the rotor; and a piston-cylinder unit disposed within the housing, the piston-cylinder unit comprising a piston movably supported in a cylinder of the piston-cylinder unit, the piston being crankshaft-driven to compress the refrigerant.

[0033] By using the lubricant reservoir according to the invention in a refrigerant compressor that can be hermetically sealed, and particularly by the asymmetrical construction of the end region of the lubricant reservoir in terms of the rotation of the projection of the end region around the intersection of the longitudinal axis of the receiving section and the end region, better lubrication of all the components of the refrigerant compressor that require lubrication can be ensured than with conventional, i.e., symmetrical lubricant reservoirs. This is because it avoids the inlet from being permanently sealed due to the formation of air bubbles in the region of the lubricant reservoir or the inlet region, and reduces the impact of the fluctuation of the lower vertex of the parabola on the entire lubricant delivery system.

[0034] Based on the continuous flow of lubricant from the storage section to the crankshaft and from the crankshaft through the outlet to the refrigerant compressor when using the lubricant reservoir in a compliant operating environment, it is essential to ensure a continuous supply of lubricant to the storage section of the lubricant reservoir.

[0035] In a particularly preferred embodiment of the refrigerant compressor according to the invention, for this purpose, the end region of the lubricant reservoir extends at least partially into the lubricant tank, and thus the inlet is arranged in the lubricant tank so that the lubricant can enter the receiving section of the lubricant reservoir from the lubricant tank.

[0036] In order to facilitate the formation of a parabolic shape of the lubricant in the receiving section, in another particularly preferred embodiment of the refrigerant compressor according to the invention, the lubricant receiving section is fixed to the end section of the crankshaft opposite to the piston-cylinder unit and / or the rotor by means of a fixing section.

[0037] In particular, it can be specified that the inner diameter of the receiving section of the lubricant reservoir is consistent with the net inner diameter of the crankshaft, and the fixed section of the lubricant reservoir is pushed externally onto the end section of the crankshaft, thus ensuring a continuous transition between the receiving section of the lubricant reservoir and the crankshaft. Attached Figure Description

[0038] The invention will now be explained in detail with reference to embodiments. The accompanying drawings are exemplary and, while intended to illustrate the inventive concept, are by no means a limitation of the inventive concept or even its final representation.

[0039] In the picture:

[0040] Figure 1 The lubricant reservoir according to the invention is shown;

[0041] Figure 2 The image shown is along the longitudinal axis of the lubricant reservoir. Figure 1 Lubricant reservoir;

[0042] Figure 3 A refrigerant compressor according to the invention is shown, having a lubricant reservoir according to the invention.

[0043] Figure 4 A lubricant reservoir according to the invention is shown, having a lubricant paraboloid formed within the lubricant reservoir during one operating condition of the refrigerant compressor. Detailed Implementation

[0044] Figure 1 A variant embodiment of the lubricant reservoir 1 according to the invention is shown. The lubricant reservoir 1 is composed of a plurality of sleeve-shaped sections, each having a constant diameter. In the variant embodiment, the transition region between these sections of constant diameter extends continuously, but it can also be constructed as discontinuous, i.e., extended in a generally stepped manner, without hindrance to the overall construction.

[0045] The lubricant reservoir 1 includes a fixing section 16 for fixing the lubricant reservoir 1 to the crankshaft 2 or rotor 11 of the refrigerant compressor 3 (see also...). Figure 3 And a receiving section 4 connected to the fixed section 16, which has a smaller diameter than the fixed section 16, the receiving section being used to receive lubricant.

[0046] The receiving section 4 itself has a cylindrical side surface and is closed on its bottom side, i.e. on the side opposite to the fixing section 16, by the end region 5 of the lubricant receiving part 1.

[0047] The above description generally results in a sleeve-shaped structure for the lubricant reservoir 1, which is open upwards and closed downwards through the end region 5 except for the lubricant inlet 6. Both the fixed section 16 and the reservoir section 4 are rotationally symmetrical about the longitudinal axis 8 of the reservoir section 4.

[0048] In the operating condition of the lubricant reservoir 1, inlet 6 establishes fluid communication between the housing of the refrigerant compressor 3 and the reservoir section 4, in which the lubricant reservoir 1 is arranged coaxially with the crankshaft 2 and is torsionally connected to the crankshaft 2.

[0049] Figure 2 As a two-dimensional projection along the longitudinal axis 8 of the accommodating section 4, it is shown Figure 1 The lubricant reservoir 1. Especially made of Figure 2 The arrangement and shape of the entrances 6 located in the end area 5 can be clearly seen.

[0050] In a specific embodiment, the shape of the entrance 6, which is an elongated hole, causes the projection 18 of the end region 5 along the longitudinal axis 8 to no longer be symmetrical when rotating around the intersection point 19 of the longitudinal axis 8 and the end region 5. Only the projection 18 rotates 360° around the intersection point 19 to depict the projection 18 of the end region 5 itself. Therefore, when the object is depicted by a rotation of any angle around a point, the rotational symmetry condition upon which the rotational symmetry of a two-dimensional object is based is not satisfied.

[0051] The asymmetry of the end region 5 of the lubricant reservoir 1 caused by the inlet 6 ensures that, under operating conditions, air bubbles that interrupt lubricant flow are not formed in the region of the lubricant reservoir 1, particularly in the region of the inlet 6, and that a continuous supply of lubricant is ensured for all specified components of the refrigerant compressor 3 requiring lubrication. Under these operating conditions, the lubricant reservoir 1 is torsionally connected to the crankshaft 2 of the refrigerant compressor 3 and arranged coaxially with the crankshaft 2 such that at least part of the end region 5 extends into the lubricant reservoir 7 of the refrigerant compressor 3 (see...). Figure 3 ).

[0052] Figure 3 A variant embodiment of the refrigerant compressor 3 according to the invention is shown, wherein the refrigerant compressor includes a drive unit 10, a piston-cylinder unit 13 and a crankshaft 2 connecting the drive unit 10 and the piston-cylinder unit 13 in a compressor housing 9, wherein the lubricant reservoir 1 according to the invention is coaxially and torsionally connected to the crankshaft 2 such that the lubricant reservoir 1 at least partially extends into a lubricant groove 7 formed in a bottom region 17 of the compressor housing 9.

[0053] The crankshaft 2 is torsionally connected to the rotor 11 of the stator 12 surrounding the drive unit 10 in the illustrated embodiment of the refrigerant compressor 3 according to the invention, and is initiated to rotate by the drive unit 10. The rotational movement of the crankshaft 2 causes the piston 14 of the piston-cylinder unit 13 to periodically move back and forth between the two dead centers of the cylinder 15 in order to draw, compress, and re-expel the refrigerant from the housing; on the other hand, the rotating crankshaft 2 also causes the lubricant reservoir 1 to begin to rotate, which causes the lubricant entering the reservoir section 4 through the inlet 6 to take on a parabolic shape 20.

[0054] When the manufacturing parameters of the lubricant reservoir 1 (in particular the inner diameter of the reservoir section 4) and the process parameters of the operating conditions of the refrigerant compressor 3 according to the invention (in particular the rotational speed of the crankshaft 2) are selected accordingly, the lubricant in the reservoir section 4 reaches a rising height through the shape of the parabolic surface 20, which allows the lubricant to be transferred from the lubricant reservoir 1 to the crankshaft 2.

[0055] To further deliver lubricant, the crankshaft 2 can be at least partially manufactured as a hollow cylinder. In this case, the lubricant exits from the crankshaft 2 through an opening in the side surface of the hollow cylinder and can reach the designated lubricated component of the refrigerant compressor 3; in this case, the maximum rise must extend at least to the first opening in the side surface. Alternatively, the crankshaft 2 can be designed as a solid cylinder with an eccentrically oriented and generally upwardly extending bore 21, by means of which lubricant can be further delivered. In the case of the inclined bore 21, a smaller maximum rise of the lubricant is sometimes sufficient, as this maximum rise only needs to achieve the transfer of lubricant to the bore 21 without bridging the entire path to the first opening. Within the inclined bore 21 of the crankshaft 2, the lubricant is pressed against the wall of the bore 21 and thereby delivered to the first opening in the side surface of the crankshaft 2.

[0056] Figure 4The lubricant reservoir 1 according to the invention, connected to the crankshaft 2, is shown at different time points t, t+1, t+2, and t+3 during the operation of the refrigerant compressor 3. At time step t, a parabolic surface 20 without bubbles is visible. Once the venting effect begins within the lubricant reservoir 1, the shape of the parabolic surface changes. The apex 22 of the parabolic surface 20 continuously descends further towards the end region 5 of the lubricant reservoir 1, as shown by the development of the parabolic surface 20 from time point t through time point t+1 to time point t+2. Finally, once the apex 22 of the parabolic surface 20 reaches the end region 5, a portion of the parabolic surface, i.e., the portion containing the bubbles, exits the lubricant reservoir 2 through inlet 6. This is ensured by the fact that inlet 6 is arranged in the end region 5 surrounding the longitudinal axis 8. When the bubbles exit the lubricant reservoir 1 through inlet 6, the bubbles seal the inlet and thus prevent lubricant from entering the lubricant reservoir 1 from the lubricant tank 7. By making the inlet 6 either have a circular circumferential shape when viewed along the longitudinal axis and the midpoint of the inlet is offset from the longitudinal axis 8, or by making the inlet 6 have a non-circular circumferential shape when viewed along the longitudinal axis, it is ensured that the bubble becomes unstable and ruptures from the lubricant reservoir 1 or from the inlet 6 after the shortest possible time and releases the lubricant reservoir or inlet again.

[0057] List of reference numerals

[0058] 1 Lubricant Reservoir

[0059] 2 crankshafts

[0060] 3 Refrigerant Compressor

[0061] 4-section accommodation

[0062] 5 End Region

[0063] 6 entrances

[0064] 7 Lubricant tank

[0065] 8 longitudinal axes

[0066] 9 Compressor housing

[0067] 10 drive units

[0068] 11 Rotors

[0069] 12 stators

[0070] 13-piston cylinder unit

[0071] 14 Pistons

[0072] 15 cylinders

[0073] 16 Fixed Sections

[0074] 17 Bottom Area

[0075] 18. Projection of the end region

[0076] 19. Intersection of longitudinal axis and end area

[0077] 20 Parabolic Surface

[0078] 21 Drilling of the crankshaft

[0079] 22. Vertex of the parabola

Claims

1. Lubricant receptacle (1) for the vertical transport of lubricant by means of a crankshaft (2) of a refrigerant compressor (3), comprising: at least one rotationally symmetrical, sleeve-shaped receptacle section (4) for accommodating lubricant, wherein a longitudinal axis (8) of the receptacle section (4) can be arranged coaxially to a longitudinal axis of the crankshaft (2) of the refrigerant compressor (3), a fixing section (16) connected to the receptacle section (4) in order to fix the lubricant receptacle (1) on the crankshaft (2), and at least one end region (5) connected to the receptacle section (4), which, apart from an inlet opening (6), encloses the receptacle section (4), wherein the inlet opening (6) in the end region allows the entry of lubricant from a lubricant groove (7) of the refrigerant compressor (3) into the receptacle section (4) of the lubricant receptacle (1), which extends at least partially into the lubricant groove (7), wherein the inlet opening (6) is arranged in the end region (5) around the longitudinal axis (8), characterized in that the inlet opening (6) has a non-circular circumferential shape as viewed in the direction of the longitudinal axis, wherein the inlet opening (6) has the shape of an elongated hole, and the midpoint of the elongated hole is offset from the intersection of the longitudinal axis of the receptacle section and the end region of the lubricant receptacle. The elongated hole is bounded on both sides by semicircular limits and the longitudinal sides of the elongated hole are greater than the radius of the semicircular limits. The length of the longitudinal sides of the elongated hole is between one and two times the radius of the semicircular limits. The size of the inlet opening (6) is between 5% and 30% of the net cross section of the receptacle section (4). The size of the inlet opening (6) is between 10% and 25% of the net cross section of the receptacle section (4).

2. The lubricant receptacle (1) according to claim 1, characterized in that The size of the inlet opening (6) is between 15% and 20% of the net cross section of the receptacle section (4).

3. The lubricant receptacle (1) according to claim 2, characterized in that The receptacle section has a cylindrical side surface in order to form a lubricant parabola within the lubricant receptacle.

4. The lubricant receptacle (1 ) according to any one of claims 1 to 3, characterized in that The lubricant receptacle (1) is arranged coaxially to the crankshaft (2) and is connected to the crankshaft (2) in a torque-proof manner.

5. The lubricant receptacle (1 ) according to any one of claims 1 to 3, characterized in that 9. Refrigerant compressor (3) with: a hermetically sealable compressor housing (9), an electric drive unit (10) arranged in a housing interior of the compressor housing (9), which comprises a rotor (11) and a stator (12), a crankshaft (2) connected to the rotor (11) in a torque-proof manner, and a piston-cylinder unit (13) arranged in the housing interior, which comprises a piston (14) movably supported in a cylinder (15) of the piston-cylinder unit (13), which can be driven by the crankshaft (2) in order to compress a refrigerant, the refrigerant compressor (3) having a lubricant receptacle (1) according to any one of claims 1 to 7 in order to transport lubricant from a lubricant groove (7) constructed in a bottom region (17) of the compressor housing (9) to the piston-cylinder unit (13) via the crankshaft (2), wherein the lubricant receptacle (1) is connected to the crankshaft (2) in a torque-proof manner.

6. The lubricant receptacle (1 ) according to any one of claims 1 to 3, characterized in that ​ 7. The lubricant receptacle (1 ) according to any one of claims 1 to 3, characterized in that ​ 8. System for a refrigerant compressor, the system comprising a crankshaft (2) of a refrigerant compressor (3) and a lubricant receptacle (1) according to any one of claims 1 to 7, wherein ​ ​ ​ ​ ​ ​ characterized in that ​ 10. The refrigerant compressor (3) according to claim 9, characterized in that The end region (5) of the lubricant receptacle (1) at least partially projects into the lubricant groove (7), whereby the inlet (6) is arranged within the lubricant groove (7) in order to be able to bring lubricant from the lubricant groove (7) into the receptacle section (4) of the lubricant receptacle (1).

11. Refrigerant compressor (3) according to claim 9 or 10, characterized in that The lubricant receptacle (1) is fixed by means of a fixing section (16) on an end section of the crankshaft (2) facing away from the piston-cylinder unit (13) or on the rotor (11).

12. The refrigerant compressor (3) according to claim 9 or 10, characterized in that The lubricant receptacle (1) is fixed by means of a fixing section (16) on an end section of the crankshaft (2) facing away from the piston-cylinder unit (13) and on the rotor (11). The lubricant receptacle (1) is fixed by means of a fixing section (16) on an end section of the crankshaft (2) facing away from the piston-cylinder unit (13) and on the rotor (11).

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